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Paul Bakker5121ce52009-01-03 21:22:43 +00001/*
2 * SSLv3/TLSv1 shared functions
3 *
Manuel Pégourié-Gonnard6fb81872015-07-27 11:11:48 +02004 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
Manuel Pégourié-Gonnard37ff1402015-09-04 14:21:07 +02005 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
Paul Bakkerb96f1542010-07-18 20:36:00 +000018 *
Manuel Pégourié-Gonnardfe446432015-03-06 13:17:10 +000019 * This file is part of mbed TLS (https://tls.mbed.org)
Paul Bakker5121ce52009-01-03 21:22:43 +000020 */
21/*
22 * The SSL 3.0 specification was drafted by Netscape in 1996,
23 * and became an IETF standard in 1999.
24 *
25 * http://wp.netscape.com/eng/ssl3/
26 * http://www.ietf.org/rfc/rfc2246.txt
27 * http://www.ietf.org/rfc/rfc4346.txt
28 */
29
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020030#if !defined(MBEDTLS_CONFIG_FILE)
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000031#include "mbedtls/config.h"
Manuel Pégourié-Gonnardcef4ad22014-04-29 12:39:06 +020032#else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020033#include MBEDTLS_CONFIG_FILE
Manuel Pégourié-Gonnardcef4ad22014-04-29 12:39:06 +020034#endif
Paul Bakker5121ce52009-01-03 21:22:43 +000035
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020036#if defined(MBEDTLS_SSL_TLS_C)
Paul Bakker5121ce52009-01-03 21:22:43 +000037
SimonBd5800b72016-04-26 07:43:27 +010038#if defined(MBEDTLS_PLATFORM_C)
39#include "mbedtls/platform.h"
40#else
41#include <stdlib.h>
42#define mbedtls_calloc calloc
43#define mbedtls_free free
SimonBd5800b72016-04-26 07:43:27 +010044#endif
45
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000046#include "mbedtls/debug.h"
47#include "mbedtls/ssl.h"
Manuel Pégourié-Gonnard5e94dde2015-05-26 11:57:05 +020048#include "mbedtls/ssl_internal.h"
Paul Bakker0be444a2013-08-27 21:55:01 +020049
Rich Evans00ab4702015-02-06 13:43:58 +000050#include <string.h>
51
Janos Follath23bdca02016-10-07 14:47:14 +010052#if defined(MBEDTLS_X509_CRT_PARSE_C)
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000053#include "mbedtls/oid.h"
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +020054#endif
55
Paul Bakker34617722014-06-13 17:20:13 +020056/* Implementation that should never be optimized out by the compiler */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020057static void mbedtls_zeroize( void *v, size_t n ) {
Paul Bakker34617722014-06-13 17:20:13 +020058 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
59}
60
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +010061/* Length of the "epoch" field in the record header */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020062static inline size_t ssl_ep_len( const mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +010063{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020064#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +020065 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +010066 return( 2 );
Manuel Pégourié-Gonnard34c10112014-03-25 13:36:22 +010067#else
68 ((void) ssl);
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +010069#endif
70 return( 0 );
71}
72
Manuel Pégourié-Gonnarddb2858c2014-09-29 14:04:42 +020073/*
74 * Start a timer.
75 * Passing millisecs = 0 cancels a running timer.
Manuel Pégourié-Gonnarddb2858c2014-09-29 14:04:42 +020076 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020077static void ssl_set_timer( mbedtls_ssl_context *ssl, uint32_t millisecs )
Manuel Pégourié-Gonnarddb2858c2014-09-29 14:04:42 +020078{
Manuel Pégourié-Gonnard2e012912015-05-12 20:55:41 +020079 if( ssl->f_set_timer == NULL )
80 return;
81
82 MBEDTLS_SSL_DEBUG_MSG( 3, ( "set_timer to %d ms", (int) millisecs ) );
83 ssl->f_set_timer( ssl->p_timer, millisecs / 4, millisecs );
Manuel Pégourié-Gonnarddb2858c2014-09-29 14:04:42 +020084}
85
86/*
87 * Return -1 is timer is expired, 0 if it isn't.
88 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020089static int ssl_check_timer( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnarddb2858c2014-09-29 14:04:42 +020090{
Manuel Pégourié-Gonnard2e012912015-05-12 20:55:41 +020091 if( ssl->f_get_timer == NULL )
Manuel Pégourié-Gonnard545102e2015-05-13 17:28:43 +020092 return( 0 );
Manuel Pégourié-Gonnard2e012912015-05-12 20:55:41 +020093
94 if( ssl->f_get_timer( ssl->p_timer ) == 2 )
Manuel Pégourié-Gonnard286a1362015-05-13 16:22:05 +020095 {
96 MBEDTLS_SSL_DEBUG_MSG( 3, ( "timer expired" ) );
Manuel Pégourié-Gonnarddb2858c2014-09-29 14:04:42 +020097 return( -1 );
Manuel Pégourié-Gonnard286a1362015-05-13 16:22:05 +020098 }
Manuel Pégourié-Gonnarddb2858c2014-09-29 14:04:42 +020099
100 return( 0 );
101}
Manuel Pégourié-Gonnarddb2858c2014-09-29 14:04:42 +0200102
Manuel Pégourié-Gonnard286a1362015-05-13 16:22:05 +0200103#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200104/*
105 * Double the retransmit timeout value, within the allowed range,
106 * returning -1 if the maximum value has already been reached.
107 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200108static int ssl_double_retransmit_timeout( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200109{
110 uint32_t new_timeout;
111
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +0200112 if( ssl->handshake->retransmit_timeout >= ssl->conf->hs_timeout_max )
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200113 return( -1 );
114
115 new_timeout = 2 * ssl->handshake->retransmit_timeout;
116
117 /* Avoid arithmetic overflow and range overflow */
118 if( new_timeout < ssl->handshake->retransmit_timeout ||
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +0200119 new_timeout > ssl->conf->hs_timeout_max )
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200120 {
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +0200121 new_timeout = ssl->conf->hs_timeout_max;
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200122 }
123
124 ssl->handshake->retransmit_timeout = new_timeout;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200125 MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs",
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200126 ssl->handshake->retransmit_timeout ) );
127
128 return( 0 );
129}
130
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200131static void ssl_reset_retransmit_timeout( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200132{
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +0200133 ssl->handshake->retransmit_timeout = ssl->conf->hs_timeout_min;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200134 MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs",
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200135 ssl->handshake->retransmit_timeout ) );
136}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200137#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200138
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200139#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
Manuel Pégourié-Gonnard581e6b62013-07-18 12:32:27 +0200140/*
141 * Convert max_fragment_length codes to length.
142 * RFC 6066 says:
143 * enum{
144 * 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255)
145 * } MaxFragmentLength;
146 * and we add 0 -> extension unused
147 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200148static unsigned int mfl_code_to_length[MBEDTLS_SSL_MAX_FRAG_LEN_INVALID] =
Manuel Pégourié-Gonnard581e6b62013-07-18 12:32:27 +0200149{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200150 MBEDTLS_SSL_MAX_CONTENT_LEN, /* MBEDTLS_SSL_MAX_FRAG_LEN_NONE */
151 512, /* MBEDTLS_SSL_MAX_FRAG_LEN_512 */
152 1024, /* MBEDTLS_SSL_MAX_FRAG_LEN_1024 */
153 2048, /* MBEDTLS_SSL_MAX_FRAG_LEN_2048 */
154 4096, /* MBEDTLS_SSL_MAX_FRAG_LEN_4096 */
Manuel Pégourié-Gonnard581e6b62013-07-18 12:32:27 +0200155};
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200156#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
Manuel Pégourié-Gonnard581e6b62013-07-18 12:32:27 +0200157
Manuel Pégourié-Gonnardcf141ca2015-05-20 10:35:51 +0200158#if defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200159static int ssl_session_copy( mbedtls_ssl_session *dst, const mbedtls_ssl_session *src )
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200160{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200161 mbedtls_ssl_session_free( dst );
162 memcpy( dst, src, sizeof( mbedtls_ssl_session ) );
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200163
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200164#if defined(MBEDTLS_X509_CRT_PARSE_C)
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200165 if( src->peer_cert != NULL )
166 {
Paul Bakker2292d1f2013-09-15 17:06:49 +0200167 int ret;
168
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +0200169 dst->peer_cert = mbedtls_calloc( 1, sizeof(mbedtls_x509_crt) );
Paul Bakkerb9cfaa02013-10-11 18:58:55 +0200170 if( dst->peer_cert == NULL )
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +0200171 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200172
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200173 mbedtls_x509_crt_init( dst->peer_cert );
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200174
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200175 if( ( ret = mbedtls_x509_crt_parse_der( dst->peer_cert, src->peer_cert->raw.p,
Manuel Pégourié-Gonnard4d2a8eb2014-06-13 20:33:27 +0200176 src->peer_cert->raw.len ) ) != 0 )
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200177 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200178 mbedtls_free( dst->peer_cert );
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200179 dst->peer_cert = NULL;
180 return( ret );
181 }
182 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200183#endif /* MBEDTLS_X509_CRT_PARSE_C */
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200184
Manuel Pégourié-Gonnardb596abf2015-05-20 10:45:29 +0200185#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200186 if( src->ticket != NULL )
187 {
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +0200188 dst->ticket = mbedtls_calloc( 1, src->ticket_len );
Paul Bakkerb9cfaa02013-10-11 18:58:55 +0200189 if( dst->ticket == NULL )
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +0200190 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200191
192 memcpy( dst->ticket, src->ticket, src->ticket_len );
193 }
Manuel Pégourié-Gonnardb596abf2015-05-20 10:45:29 +0200194#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200195
196 return( 0 );
197}
Manuel Pégourié-Gonnardcf141ca2015-05-20 10:35:51 +0200198#endif /* MBEDTLS_SSL_CLI_C */
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200199
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200200#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
201int (*mbedtls_ssl_hw_record_init)( mbedtls_ssl_context *ssl,
Paul Bakker9af723c2014-05-01 13:03:14 +0200202 const unsigned char *key_enc, const unsigned char *key_dec,
203 size_t keylen,
204 const unsigned char *iv_enc, const unsigned char *iv_dec,
205 size_t ivlen,
206 const unsigned char *mac_enc, const unsigned char *mac_dec,
Paul Bakker66d5d072014-06-17 16:39:18 +0200207 size_t maclen ) = NULL;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200208int (*mbedtls_ssl_hw_record_activate)( mbedtls_ssl_context *ssl, int direction) = NULL;
209int (*mbedtls_ssl_hw_record_reset)( mbedtls_ssl_context *ssl ) = NULL;
210int (*mbedtls_ssl_hw_record_write)( mbedtls_ssl_context *ssl ) = NULL;
211int (*mbedtls_ssl_hw_record_read)( mbedtls_ssl_context *ssl ) = NULL;
212int (*mbedtls_ssl_hw_record_finish)( mbedtls_ssl_context *ssl ) = NULL;
213#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
Paul Bakker05ef8352012-05-08 09:17:57 +0000214
Paul Bakker5121ce52009-01-03 21:22:43 +0000215/*
216 * Key material generation
217 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200218#if defined(MBEDTLS_SSL_PROTO_SSL3)
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +0200219static int ssl3_prf( const unsigned char *secret, size_t slen,
220 const char *label,
221 const unsigned char *random, size_t rlen,
Paul Bakker5f70b252012-09-13 14:23:06 +0000222 unsigned char *dstbuf, size_t dlen )
223{
224 size_t i;
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200225 mbedtls_md5_context md5;
226 mbedtls_sha1_context sha1;
Paul Bakker5f70b252012-09-13 14:23:06 +0000227 unsigned char padding[16];
228 unsigned char sha1sum[20];
229 ((void)label);
230
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200231 mbedtls_md5_init( &md5 );
232 mbedtls_sha1_init( &sha1 );
Paul Bakker5b4af392014-06-26 12:09:34 +0200233
Paul Bakker5f70b252012-09-13 14:23:06 +0000234 /*
235 * SSLv3:
236 * block =
237 * MD5( secret + SHA1( 'A' + secret + random ) ) +
238 * MD5( secret + SHA1( 'BB' + secret + random ) ) +
239 * MD5( secret + SHA1( 'CCC' + secret + random ) ) +
240 * ...
241 */
242 for( i = 0; i < dlen / 16; i++ )
243 {
Paul Bakkerb9cfaa02013-10-11 18:58:55 +0200244 memset( padding, (unsigned char) ('A' + i), 1 + i );
Paul Bakker5f70b252012-09-13 14:23:06 +0000245
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200246 mbedtls_sha1_starts( &sha1 );
247 mbedtls_sha1_update( &sha1, padding, 1 + i );
248 mbedtls_sha1_update( &sha1, secret, slen );
249 mbedtls_sha1_update( &sha1, random, rlen );
250 mbedtls_sha1_finish( &sha1, sha1sum );
Paul Bakker5f70b252012-09-13 14:23:06 +0000251
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200252 mbedtls_md5_starts( &md5 );
253 mbedtls_md5_update( &md5, secret, slen );
254 mbedtls_md5_update( &md5, sha1sum, 20 );
255 mbedtls_md5_finish( &md5, dstbuf + i * 16 );
Paul Bakker5f70b252012-09-13 14:23:06 +0000256 }
257
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200258 mbedtls_md5_free( &md5 );
259 mbedtls_sha1_free( &sha1 );
Paul Bakker5f70b252012-09-13 14:23:06 +0000260
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200261 mbedtls_zeroize( padding, sizeof( padding ) );
262 mbedtls_zeroize( sha1sum, sizeof( sha1sum ) );
Paul Bakker5f70b252012-09-13 14:23:06 +0000263
264 return( 0 );
265}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200266#endif /* MBEDTLS_SSL_PROTO_SSL3 */
Paul Bakker5f70b252012-09-13 14:23:06 +0000267
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200268#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +0200269static int tls1_prf( const unsigned char *secret, size_t slen,
270 const char *label,
271 const unsigned char *random, size_t rlen,
Paul Bakker23986e52011-04-24 08:57:21 +0000272 unsigned char *dstbuf, size_t dlen )
Paul Bakker5121ce52009-01-03 21:22:43 +0000273{
Paul Bakker23986e52011-04-24 08:57:21 +0000274 size_t nb, hs;
275 size_t i, j, k;
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +0200276 const unsigned char *S1, *S2;
Paul Bakker5121ce52009-01-03 21:22:43 +0000277 unsigned char tmp[128];
278 unsigned char h_i[20];
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200279 const mbedtls_md_info_t *md_info;
280 mbedtls_md_context_t md_ctx;
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100281 int ret;
282
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200283 mbedtls_md_init( &md_ctx );
Paul Bakker5121ce52009-01-03 21:22:43 +0000284
285 if( sizeof( tmp ) < 20 + strlen( label ) + rlen )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200286 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Paul Bakker5121ce52009-01-03 21:22:43 +0000287
288 hs = ( slen + 1 ) / 2;
289 S1 = secret;
290 S2 = secret + slen - hs;
291
292 nb = strlen( label );
293 memcpy( tmp + 20, label, nb );
294 memcpy( tmp + 20 + nb, random, rlen );
295 nb += rlen;
296
297 /*
298 * First compute P_md5(secret,label+random)[0..dlen]
299 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200300 if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_MD5 ) ) == NULL )
301 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard7da726b2015-03-24 18:08:19 +0100302
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200303 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100304 return( ret );
305
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200306 mbedtls_md_hmac_starts( &md_ctx, S1, hs );
307 mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb );
308 mbedtls_md_hmac_finish( &md_ctx, 4 + tmp );
Paul Bakker5121ce52009-01-03 21:22:43 +0000309
310 for( i = 0; i < dlen; i += 16 )
311 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200312 mbedtls_md_hmac_reset ( &md_ctx );
313 mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 + nb );
314 mbedtls_md_hmac_finish( &md_ctx, h_i );
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100315
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200316 mbedtls_md_hmac_reset ( &md_ctx );
317 mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 );
318 mbedtls_md_hmac_finish( &md_ctx, 4 + tmp );
Paul Bakker5121ce52009-01-03 21:22:43 +0000319
320 k = ( i + 16 > dlen ) ? dlen % 16 : 16;
321
322 for( j = 0; j < k; j++ )
323 dstbuf[i + j] = h_i[j];
324 }
325
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200326 mbedtls_md_free( &md_ctx );
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100327
Paul Bakker5121ce52009-01-03 21:22:43 +0000328 /*
329 * XOR out with P_sha1(secret,label+random)[0..dlen]
330 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200331 if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 ) ) == NULL )
332 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard7da726b2015-03-24 18:08:19 +0100333
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200334 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100335 return( ret );
336
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200337 mbedtls_md_hmac_starts( &md_ctx, S2, hs );
338 mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb );
339 mbedtls_md_hmac_finish( &md_ctx, tmp );
Paul Bakker5121ce52009-01-03 21:22:43 +0000340
341 for( i = 0; i < dlen; i += 20 )
342 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200343 mbedtls_md_hmac_reset ( &md_ctx );
344 mbedtls_md_hmac_update( &md_ctx, tmp, 20 + nb );
345 mbedtls_md_hmac_finish( &md_ctx, h_i );
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100346
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200347 mbedtls_md_hmac_reset ( &md_ctx );
348 mbedtls_md_hmac_update( &md_ctx, tmp, 20 );
349 mbedtls_md_hmac_finish( &md_ctx, tmp );
Paul Bakker5121ce52009-01-03 21:22:43 +0000350
351 k = ( i + 20 > dlen ) ? dlen % 20 : 20;
352
353 for( j = 0; j < k; j++ )
354 dstbuf[i + j] = (unsigned char)( dstbuf[i + j] ^ h_i[j] );
355 }
356
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200357 mbedtls_md_free( &md_ctx );
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100358
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200359 mbedtls_zeroize( tmp, sizeof( tmp ) );
360 mbedtls_zeroize( h_i, sizeof( h_i ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000361
362 return( 0 );
363}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200364#endif /* MBEDTLS_SSL_PROTO_TLS1) || MBEDTLS_SSL_PROTO_TLS1_1 */
Paul Bakker5121ce52009-01-03 21:22:43 +0000365
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200366#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
367static int tls_prf_generic( mbedtls_md_type_t md_type,
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100368 const unsigned char *secret, size_t slen,
369 const char *label,
370 const unsigned char *random, size_t rlen,
371 unsigned char *dstbuf, size_t dlen )
Paul Bakker1ef83d62012-04-11 12:09:53 +0000372{
373 size_t nb;
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100374 size_t i, j, k, md_len;
Paul Bakker1ef83d62012-04-11 12:09:53 +0000375 unsigned char tmp[128];
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200376 unsigned char h_i[MBEDTLS_MD_MAX_SIZE];
377 const mbedtls_md_info_t *md_info;
378 mbedtls_md_context_t md_ctx;
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100379 int ret;
380
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200381 mbedtls_md_init( &md_ctx );
Paul Bakker1ef83d62012-04-11 12:09:53 +0000382
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200383 if( ( md_info = mbedtls_md_info_from_type( md_type ) ) == NULL )
384 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100385
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200386 md_len = mbedtls_md_get_size( md_info );
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100387
388 if( sizeof( tmp ) < md_len + strlen( label ) + rlen )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200389 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Paul Bakker1ef83d62012-04-11 12:09:53 +0000390
391 nb = strlen( label );
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100392 memcpy( tmp + md_len, label, nb );
393 memcpy( tmp + md_len + nb, random, rlen );
Paul Bakker1ef83d62012-04-11 12:09:53 +0000394 nb += rlen;
395
396 /*
397 * Compute P_<hash>(secret, label + random)[0..dlen]
398 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200399 if ( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100400 return( ret );
401
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200402 mbedtls_md_hmac_starts( &md_ctx, secret, slen );
403 mbedtls_md_hmac_update( &md_ctx, tmp + md_len, nb );
404 mbedtls_md_hmac_finish( &md_ctx, tmp );
Manuel Pégourié-Gonnard7da726b2015-03-24 18:08:19 +0100405
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100406 for( i = 0; i < dlen; i += md_len )
Paul Bakker1ef83d62012-04-11 12:09:53 +0000407 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200408 mbedtls_md_hmac_reset ( &md_ctx );
409 mbedtls_md_hmac_update( &md_ctx, tmp, md_len + nb );
410 mbedtls_md_hmac_finish( &md_ctx, h_i );
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100411
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200412 mbedtls_md_hmac_reset ( &md_ctx );
413 mbedtls_md_hmac_update( &md_ctx, tmp, md_len );
414 mbedtls_md_hmac_finish( &md_ctx, tmp );
Paul Bakker1ef83d62012-04-11 12:09:53 +0000415
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100416 k = ( i + md_len > dlen ) ? dlen % md_len : md_len;
Paul Bakker1ef83d62012-04-11 12:09:53 +0000417
418 for( j = 0; j < k; j++ )
419 dstbuf[i + j] = h_i[j];
420 }
421
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200422 mbedtls_md_free( &md_ctx );
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100423
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200424 mbedtls_zeroize( tmp, sizeof( tmp ) );
425 mbedtls_zeroize( h_i, sizeof( h_i ) );
Paul Bakker1ef83d62012-04-11 12:09:53 +0000426
427 return( 0 );
428}
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100429
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200430#if defined(MBEDTLS_SHA256_C)
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100431static int tls_prf_sha256( const unsigned char *secret, size_t slen,
432 const char *label,
433 const unsigned char *random, size_t rlen,
434 unsigned char *dstbuf, size_t dlen )
435{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200436 return( tls_prf_generic( MBEDTLS_MD_SHA256, secret, slen,
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100437 label, random, rlen, dstbuf, dlen ) );
438}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200439#endif /* MBEDTLS_SHA256_C */
Paul Bakker1ef83d62012-04-11 12:09:53 +0000440
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200441#if defined(MBEDTLS_SHA512_C)
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +0200442static int tls_prf_sha384( const unsigned char *secret, size_t slen,
443 const char *label,
444 const unsigned char *random, size_t rlen,
Paul Bakkerca4ab492012-04-18 14:23:57 +0000445 unsigned char *dstbuf, size_t dlen )
446{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200447 return( tls_prf_generic( MBEDTLS_MD_SHA384, secret, slen,
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100448 label, random, rlen, dstbuf, dlen ) );
Paul Bakkerca4ab492012-04-18 14:23:57 +0000449}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200450#endif /* MBEDTLS_SHA512_C */
451#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakkerca4ab492012-04-18 14:23:57 +0000452
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200453static void ssl_update_checksum_start( mbedtls_ssl_context *, const unsigned char *, size_t );
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200454
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200455#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
456 defined(MBEDTLS_SSL_PROTO_TLS1_1)
457static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *, const unsigned char *, size_t );
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200458#endif
Paul Bakker380da532012-04-18 16:10:25 +0000459
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200460#if defined(MBEDTLS_SSL_PROTO_SSL3)
461static void ssl_calc_verify_ssl( mbedtls_ssl_context *, unsigned char * );
462static void ssl_calc_finished_ssl( mbedtls_ssl_context *, unsigned char *, int );
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200463#endif
464
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200465#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
466static void ssl_calc_verify_tls( mbedtls_ssl_context *, unsigned char * );
467static void ssl_calc_finished_tls( mbedtls_ssl_context *, unsigned char *, int );
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200468#endif
469
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200470#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
471#if defined(MBEDTLS_SHA256_C)
472static void ssl_update_checksum_sha256( mbedtls_ssl_context *, const unsigned char *, size_t );
473static void ssl_calc_verify_tls_sha256( mbedtls_ssl_context *,unsigned char * );
474static void ssl_calc_finished_tls_sha256( mbedtls_ssl_context *,unsigned char *, int );
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200475#endif
Paul Bakker769075d2012-11-24 11:26:46 +0100476
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200477#if defined(MBEDTLS_SHA512_C)
478static void ssl_update_checksum_sha384( mbedtls_ssl_context *, const unsigned char *, size_t );
479static void ssl_calc_verify_tls_sha384( mbedtls_ssl_context *, unsigned char * );
480static void ssl_calc_finished_tls_sha384( mbedtls_ssl_context *, unsigned char *, int );
Paul Bakker769075d2012-11-24 11:26:46 +0100481#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200482#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker1ef83d62012-04-11 12:09:53 +0000483
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200484int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +0000485{
Paul Bakkerda02a7f2013-08-31 17:25:14 +0200486 int ret = 0;
Paul Bakker5121ce52009-01-03 21:22:43 +0000487 unsigned char tmp[64];
Paul Bakker5121ce52009-01-03 21:22:43 +0000488 unsigned char keyblk[256];
489 unsigned char *key1;
490 unsigned char *key2;
Paul Bakker68884e32013-01-07 18:20:04 +0100491 unsigned char *mac_enc;
492 unsigned char *mac_dec;
Paul Bakkerb9cfaa02013-10-11 18:58:55 +0200493 size_t iv_copy_len;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200494 const mbedtls_cipher_info_t *cipher_info;
495 const mbedtls_md_info_t *md_info;
Paul Bakker68884e32013-01-07 18:20:04 +0100496
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200497 mbedtls_ssl_session *session = ssl->session_negotiate;
498 mbedtls_ssl_transform *transform = ssl->transform_negotiate;
499 mbedtls_ssl_handshake_params *handshake = ssl->handshake;
Paul Bakker5121ce52009-01-03 21:22:43 +0000500
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200501 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> derive keys" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000502
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200503 cipher_info = mbedtls_cipher_info_from_type( transform->ciphersuite_info->cipher );
Paul Bakker68884e32013-01-07 18:20:04 +0100504 if( cipher_info == NULL )
505 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200506 MBEDTLS_SSL_DEBUG_MSG( 1, ( "cipher info for %d not found",
Paul Bakker68884e32013-01-07 18:20:04 +0100507 transform->ciphersuite_info->cipher ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200508 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Paul Bakker68884e32013-01-07 18:20:04 +0100509 }
510
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200511 md_info = mbedtls_md_info_from_type( transform->ciphersuite_info->mac );
Paul Bakker68884e32013-01-07 18:20:04 +0100512 if( md_info == NULL )
513 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200514 MBEDTLS_SSL_DEBUG_MSG( 1, ( "mbedtls_md info for %d not found",
Paul Bakker68884e32013-01-07 18:20:04 +0100515 transform->ciphersuite_info->mac ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200516 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Paul Bakker68884e32013-01-07 18:20:04 +0100517 }
518
Paul Bakker5121ce52009-01-03 21:22:43 +0000519 /*
Paul Bakkerca4ab492012-04-18 14:23:57 +0000520 * Set appropriate PRF function and other SSL / TLS / TLS1.2 functions
Paul Bakker1ef83d62012-04-11 12:09:53 +0000521 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200522#if defined(MBEDTLS_SSL_PROTO_SSL3)
523 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Paul Bakkerca4ab492012-04-18 14:23:57 +0000524 {
Paul Bakker48916f92012-09-16 19:57:18 +0000525 handshake->tls_prf = ssl3_prf;
526 handshake->calc_verify = ssl_calc_verify_ssl;
527 handshake->calc_finished = ssl_calc_finished_ssl;
Paul Bakkerca4ab492012-04-18 14:23:57 +0000528 }
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200529 else
530#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200531#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
532 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
Paul Bakkerca4ab492012-04-18 14:23:57 +0000533 {
Paul Bakker48916f92012-09-16 19:57:18 +0000534 handshake->tls_prf = tls1_prf;
535 handshake->calc_verify = ssl_calc_verify_tls;
536 handshake->calc_finished = ssl_calc_finished_tls;
Paul Bakkerca4ab492012-04-18 14:23:57 +0000537 }
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200538 else
539#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200540#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
541#if defined(MBEDTLS_SHA512_C)
542 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 &&
543 transform->ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
Paul Bakkerca4ab492012-04-18 14:23:57 +0000544 {
Paul Bakker48916f92012-09-16 19:57:18 +0000545 handshake->tls_prf = tls_prf_sha384;
546 handshake->calc_verify = ssl_calc_verify_tls_sha384;
547 handshake->calc_finished = ssl_calc_finished_tls_sha384;
Paul Bakkerca4ab492012-04-18 14:23:57 +0000548 }
Paul Bakker1ef83d62012-04-11 12:09:53 +0000549 else
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200550#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200551#if defined(MBEDTLS_SHA256_C)
552 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
Paul Bakkerca4ab492012-04-18 14:23:57 +0000553 {
Paul Bakker48916f92012-09-16 19:57:18 +0000554 handshake->tls_prf = tls_prf_sha256;
555 handshake->calc_verify = ssl_calc_verify_tls_sha256;
556 handshake->calc_finished = ssl_calc_finished_tls_sha256;
Paul Bakkerca4ab492012-04-18 14:23:57 +0000557 }
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200558 else
559#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200560#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker577e0062013-08-28 11:57:20 +0200561 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200562 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
563 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakker577e0062013-08-28 11:57:20 +0200564 }
Paul Bakker1ef83d62012-04-11 12:09:53 +0000565
566 /*
Paul Bakker5121ce52009-01-03 21:22:43 +0000567 * SSLv3:
568 * master =
569 * MD5( premaster + SHA1( 'A' + premaster + randbytes ) ) +
570 * MD5( premaster + SHA1( 'BB' + premaster + randbytes ) ) +
571 * MD5( premaster + SHA1( 'CCC' + premaster + randbytes ) )
Paul Bakkerf7abd422013-04-16 13:15:56 +0200572 *
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200573 * TLSv1+:
Paul Bakker5121ce52009-01-03 21:22:43 +0000574 * master = PRF( premaster, "master secret", randbytes )[0..47]
575 */
Paul Bakker0a597072012-09-25 21:55:46 +0000576 if( handshake->resume == 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +0000577 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200578 MBEDTLS_SSL_DEBUG_BUF( 3, "premaster secret", handshake->premaster,
Paul Bakker48916f92012-09-16 19:57:18 +0000579 handshake->pmslen );
Paul Bakker5121ce52009-01-03 21:22:43 +0000580
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200581#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
582 if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED )
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200583 {
584 unsigned char session_hash[48];
585 size_t hash_len;
586
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200587 MBEDTLS_SSL_DEBUG_MSG( 3, ( "using extended master secret" ) );
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200588
589 ssl->handshake->calc_verify( ssl, session_hash );
590
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200591#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
592 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200593 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200594#if defined(MBEDTLS_SHA512_C)
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200595 if( ssl->transform_negotiate->ciphersuite_info->mac ==
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200596 MBEDTLS_MD_SHA384 )
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200597 {
598 hash_len = 48;
599 }
600 else
601#endif
602 hash_len = 32;
603 }
604 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200605#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200606 hash_len = 36;
607
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200608 MBEDTLS_SSL_DEBUG_BUF( 3, "session hash", session_hash, hash_len );
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200609
Manuel Pégourié-Gonnarde9608182015-03-26 11:47:47 +0100610 ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
611 "extended master secret",
612 session_hash, hash_len,
613 session->master, 48 );
614 if( ret != 0 )
615 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200616 MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
Manuel Pégourié-Gonnarde9608182015-03-26 11:47:47 +0100617 return( ret );
618 }
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200619
620 }
621 else
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +0200622#endif
Manuel Pégourié-Gonnarde9608182015-03-26 11:47:47 +0100623 ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
624 "master secret",
625 handshake->randbytes, 64,
626 session->master, 48 );
627 if( ret != 0 )
628 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200629 MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
Manuel Pégourié-Gonnarde9608182015-03-26 11:47:47 +0100630 return( ret );
631 }
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200632
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200633 mbedtls_zeroize( handshake->premaster, sizeof(handshake->premaster) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000634 }
635 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200636 MBEDTLS_SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000637
638 /*
639 * Swap the client and server random values.
640 */
Paul Bakker48916f92012-09-16 19:57:18 +0000641 memcpy( tmp, handshake->randbytes, 64 );
642 memcpy( handshake->randbytes, tmp + 32, 32 );
643 memcpy( handshake->randbytes + 32, tmp, 32 );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200644 mbedtls_zeroize( tmp, sizeof( tmp ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000645
646 /*
647 * SSLv3:
648 * key block =
649 * MD5( master + SHA1( 'A' + master + randbytes ) ) +
650 * MD5( master + SHA1( 'BB' + master + randbytes ) ) +
651 * MD5( master + SHA1( 'CCC' + master + randbytes ) ) +
652 * MD5( master + SHA1( 'DDDD' + master + randbytes ) ) +
653 * ...
654 *
655 * TLSv1:
656 * key block = PRF( master, "key expansion", randbytes )
657 */
Manuel Pégourié-Gonnarde9608182015-03-26 11:47:47 +0100658 ret = handshake->tls_prf( session->master, 48, "key expansion",
659 handshake->randbytes, 64, keyblk, 256 );
660 if( ret != 0 )
661 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200662 MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
Manuel Pégourié-Gonnarde9608182015-03-26 11:47:47 +0100663 return( ret );
664 }
Paul Bakker5121ce52009-01-03 21:22:43 +0000665
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200666 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite = %s",
667 mbedtls_ssl_get_ciphersuite_name( session->ciphersuite ) ) );
668 MBEDTLS_SSL_DEBUG_BUF( 3, "master secret", session->master, 48 );
669 MBEDTLS_SSL_DEBUG_BUF( 4, "random bytes", handshake->randbytes, 64 );
670 MBEDTLS_SSL_DEBUG_BUF( 4, "key block", keyblk, 256 );
Paul Bakker5121ce52009-01-03 21:22:43 +0000671
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200672 mbedtls_zeroize( handshake->randbytes, sizeof( handshake->randbytes ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000673
674 /*
675 * Determine the appropriate key, IV and MAC length.
676 */
Paul Bakker68884e32013-01-07 18:20:04 +0100677
Manuel Pégourié-Gonnard898e0aa2015-06-18 15:28:12 +0200678 transform->keylen = cipher_info->key_bitlen / 8;
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200679
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200680 if( cipher_info->mode == MBEDTLS_MODE_GCM ||
681 cipher_info->mode == MBEDTLS_MODE_CCM )
Paul Bakker5121ce52009-01-03 21:22:43 +0000682 {
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200683 transform->maclen = 0;
684
Paul Bakker68884e32013-01-07 18:20:04 +0100685 transform->ivlen = 12;
686 transform->fixed_ivlen = 4;
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200687
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200688 /* Minimum length is expicit IV + tag */
689 transform->minlen = transform->ivlen - transform->fixed_ivlen
690 + ( transform->ciphersuite_info->flags &
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200691 MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16 );
Paul Bakker68884e32013-01-07 18:20:04 +0100692 }
693 else
694 {
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200695 /* Initialize HMAC contexts */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200696 if( ( ret = mbedtls_md_setup( &transform->md_ctx_enc, md_info, 1 ) ) != 0 ||
697 ( ret = mbedtls_md_setup( &transform->md_ctx_dec, md_info, 1 ) ) != 0 )
Paul Bakker68884e32013-01-07 18:20:04 +0100698 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200699 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret );
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200700 return( ret );
Paul Bakker68884e32013-01-07 18:20:04 +0100701 }
Paul Bakker5121ce52009-01-03 21:22:43 +0000702
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200703 /* Get MAC length */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200704 transform->maclen = mbedtls_md_get_size( md_info );
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200705
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200706#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200707 /*
708 * If HMAC is to be truncated, we shall keep the leftmost bytes,
709 * (rfc 6066 page 13 or rfc 2104 section 4),
710 * so we only need to adjust the length here.
711 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200712 if( session->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED )
713 transform->maclen = MBEDTLS_SSL_TRUNCATED_HMAC_LEN;
714#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200715
716 /* IV length */
Paul Bakker68884e32013-01-07 18:20:04 +0100717 transform->ivlen = cipher_info->iv_size;
Paul Bakker5121ce52009-01-03 21:22:43 +0000718
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200719 /* Minimum length */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200720 if( cipher_info->mode == MBEDTLS_MODE_STREAM )
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200721 transform->minlen = transform->maclen;
722 else
Paul Bakker68884e32013-01-07 18:20:04 +0100723 {
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200724 /*
725 * GenericBlockCipher:
Manuel Pégourié-Gonnard169dd6a2014-11-04 16:15:39 +0100726 * 1. if EtM is in use: one block plus MAC
727 * otherwise: * first multiple of blocklen greater than maclen
728 * 2. IV except for SSL3 and TLS 1.0
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200729 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200730#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
731 if( session->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED )
Manuel Pégourié-Gonnard169dd6a2014-11-04 16:15:39 +0100732 {
733 transform->minlen = transform->maclen
734 + cipher_info->block_size;
735 }
736 else
737#endif
738 {
739 transform->minlen = transform->maclen
740 + cipher_info->block_size
741 - transform->maclen % cipher_info->block_size;
742 }
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200743
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200744#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
745 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ||
746 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_1 )
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200747 ; /* No need to adjust minlen */
Paul Bakker68884e32013-01-07 18:20:04 +0100748 else
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200749#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200750#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
751 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_2 ||
752 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200753 {
754 transform->minlen += transform->ivlen;
755 }
756 else
757#endif
758 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200759 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
760 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200761 }
Paul Bakker68884e32013-01-07 18:20:04 +0100762 }
Paul Bakker5121ce52009-01-03 21:22:43 +0000763 }
764
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200765 MBEDTLS_SSL_DEBUG_MSG( 3, ( "keylen: %d, minlen: %d, ivlen: %d, maclen: %d",
Paul Bakker48916f92012-09-16 19:57:18 +0000766 transform->keylen, transform->minlen, transform->ivlen,
767 transform->maclen ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000768
769 /*
770 * Finally setup the cipher contexts, IVs and MAC secrets.
771 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200772#if defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +0200773 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
Paul Bakker5121ce52009-01-03 21:22:43 +0000774 {
Paul Bakker48916f92012-09-16 19:57:18 +0000775 key1 = keyblk + transform->maclen * 2;
776 key2 = keyblk + transform->maclen * 2 + transform->keylen;
Paul Bakker5121ce52009-01-03 21:22:43 +0000777
Paul Bakker68884e32013-01-07 18:20:04 +0100778 mac_enc = keyblk;
779 mac_dec = keyblk + transform->maclen;
Paul Bakker5121ce52009-01-03 21:22:43 +0000780
Paul Bakker2e11f7d2010-07-25 14:24:53 +0000781 /*
782 * This is not used in TLS v1.1.
783 */
Paul Bakker48916f92012-09-16 19:57:18 +0000784 iv_copy_len = ( transform->fixed_ivlen ) ?
785 transform->fixed_ivlen : transform->ivlen;
786 memcpy( transform->iv_enc, key2 + transform->keylen, iv_copy_len );
787 memcpy( transform->iv_dec, key2 + transform->keylen + iv_copy_len,
Paul Bakkerca4ab492012-04-18 14:23:57 +0000788 iv_copy_len );
Paul Bakker5121ce52009-01-03 21:22:43 +0000789 }
790 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200791#endif /* MBEDTLS_SSL_CLI_C */
792#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +0200793 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
Paul Bakker5121ce52009-01-03 21:22:43 +0000794 {
Paul Bakker48916f92012-09-16 19:57:18 +0000795 key1 = keyblk + transform->maclen * 2 + transform->keylen;
796 key2 = keyblk + transform->maclen * 2;
Paul Bakker5121ce52009-01-03 21:22:43 +0000797
Paul Bakker68884e32013-01-07 18:20:04 +0100798 mac_enc = keyblk + transform->maclen;
799 mac_dec = keyblk;
Paul Bakker5121ce52009-01-03 21:22:43 +0000800
Paul Bakker2e11f7d2010-07-25 14:24:53 +0000801 /*
802 * This is not used in TLS v1.1.
803 */
Paul Bakker48916f92012-09-16 19:57:18 +0000804 iv_copy_len = ( transform->fixed_ivlen ) ?
805 transform->fixed_ivlen : transform->ivlen;
806 memcpy( transform->iv_dec, key1 + transform->keylen, iv_copy_len );
807 memcpy( transform->iv_enc, key1 + transform->keylen + iv_copy_len,
Paul Bakkerca4ab492012-04-18 14:23:57 +0000808 iv_copy_len );
Paul Bakker5121ce52009-01-03 21:22:43 +0000809 }
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +0100810 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200811#endif /* MBEDTLS_SSL_SRV_C */
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +0100812 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200813 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
814 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +0100815 }
Paul Bakker5121ce52009-01-03 21:22:43 +0000816
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200817#if defined(MBEDTLS_SSL_PROTO_SSL3)
818 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Paul Bakker68884e32013-01-07 18:20:04 +0100819 {
Manuel Pégourié-Gonnard7cfdcb82014-01-18 18:22:55 +0100820 if( transform->maclen > sizeof transform->mac_enc )
821 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200822 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
823 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard7cfdcb82014-01-18 18:22:55 +0100824 }
825
Paul Bakker68884e32013-01-07 18:20:04 +0100826 memcpy( transform->mac_enc, mac_enc, transform->maclen );
827 memcpy( transform->mac_dec, mac_dec, transform->maclen );
828 }
829 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200830#endif /* MBEDTLS_SSL_PROTO_SSL3 */
831#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
832 defined(MBEDTLS_SSL_PROTO_TLS1_2)
833 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
Paul Bakker68884e32013-01-07 18:20:04 +0100834 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200835 mbedtls_md_hmac_starts( &transform->md_ctx_enc, mac_enc, transform->maclen );
836 mbedtls_md_hmac_starts( &transform->md_ctx_dec, mac_dec, transform->maclen );
Paul Bakker68884e32013-01-07 18:20:04 +0100837 }
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200838 else
839#endif
Paul Bakker577e0062013-08-28 11:57:20 +0200840 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200841 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
842 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakker577e0062013-08-28 11:57:20 +0200843 }
Paul Bakker68884e32013-01-07 18:20:04 +0100844
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200845#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
846 if( mbedtls_ssl_hw_record_init != NULL )
Paul Bakker05ef8352012-05-08 09:17:57 +0000847 {
848 int ret = 0;
849
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200850 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_init()" ) );
Paul Bakker05ef8352012-05-08 09:17:57 +0000851
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200852 if( ( ret = mbedtls_ssl_hw_record_init( ssl, key1, key2, transform->keylen,
Paul Bakker07eb38b2012-12-19 14:42:06 +0100853 transform->iv_enc, transform->iv_dec,
854 iv_copy_len,
Paul Bakker68884e32013-01-07 18:20:04 +0100855 mac_enc, mac_dec,
Paul Bakker07eb38b2012-12-19 14:42:06 +0100856 transform->maclen ) ) != 0 )
Paul Bakker05ef8352012-05-08 09:17:57 +0000857 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200858 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_init", ret );
859 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
Paul Bakker05ef8352012-05-08 09:17:57 +0000860 }
861 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200862#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
Paul Bakker05ef8352012-05-08 09:17:57 +0000863
Manuel Pégourié-Gonnard024b6df2015-10-19 13:52:53 +0200864#if defined(MBEDTLS_SSL_EXPORT_KEYS)
865 if( ssl->conf->f_export_keys != NULL )
Robert Cragie4feb7ae2015-10-02 13:33:37 +0100866 {
Manuel Pégourié-Gonnard024b6df2015-10-19 13:52:53 +0200867 ssl->conf->f_export_keys( ssl->conf->p_export_keys,
868 session->master, keyblk,
Robert Cragie4feb7ae2015-10-02 13:33:37 +0100869 transform->maclen, transform->keylen,
870 iv_copy_len );
871 }
872#endif
873
Manuel Pégourié-Gonnard8473f872015-05-14 13:51:45 +0200874 if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_enc,
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200875 cipher_info ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +0000876 {
Manuel Pégourié-Gonnard8473f872015-05-14 13:51:45 +0200877 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret );
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200878 return( ret );
879 }
Paul Bakkerda02a7f2013-08-31 17:25:14 +0200880
Manuel Pégourié-Gonnard8473f872015-05-14 13:51:45 +0200881 if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_dec,
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200882 cipher_info ) ) != 0 )
883 {
Manuel Pégourié-Gonnard8473f872015-05-14 13:51:45 +0200884 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret );
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200885 return( ret );
886 }
Paul Bakkerda02a7f2013-08-31 17:25:14 +0200887
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200888 if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_enc, key1,
Manuel Pégourié-Gonnard898e0aa2015-06-18 15:28:12 +0200889 cipher_info->key_bitlen,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200890 MBEDTLS_ENCRYPT ) ) != 0 )
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200891 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200892 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret );
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200893 return( ret );
894 }
Paul Bakkerea6ad3f2013-09-02 14:57:01 +0200895
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200896 if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_dec, key2,
Manuel Pégourié-Gonnard898e0aa2015-06-18 15:28:12 +0200897 cipher_info->key_bitlen,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200898 MBEDTLS_DECRYPT ) ) != 0 )
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200899 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200900 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret );
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200901 return( ret );
902 }
Paul Bakkerda02a7f2013-08-31 17:25:14 +0200903
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200904#if defined(MBEDTLS_CIPHER_MODE_CBC)
905 if( cipher_info->mode == MBEDTLS_MODE_CBC )
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200906 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200907 if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_enc,
908 MBEDTLS_PADDING_NONE ) ) != 0 )
Manuel Pégourié-Gonnard126a66f2013-10-25 18:33:32 +0200909 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200910 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret );
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200911 return( ret );
Manuel Pégourié-Gonnard126a66f2013-10-25 18:33:32 +0200912 }
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200913
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200914 if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_dec,
915 MBEDTLS_PADDING_NONE ) ) != 0 )
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200916 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200917 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret );
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200918 return( ret );
919 }
Paul Bakker5121ce52009-01-03 21:22:43 +0000920 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200921#endif /* MBEDTLS_CIPHER_MODE_CBC */
Paul Bakker5121ce52009-01-03 21:22:43 +0000922
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200923 mbedtls_zeroize( keyblk, sizeof( keyblk ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000924
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200925#if defined(MBEDTLS_ZLIB_SUPPORT)
Paul Bakker2770fbd2012-07-03 13:30:23 +0000926 // Initialize compression
927 //
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200928 if( session->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
Paul Bakker2770fbd2012-07-03 13:30:23 +0000929 {
Paul Bakker16770332013-10-11 09:59:44 +0200930 if( ssl->compress_buf == NULL )
931 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200932 MBEDTLS_SSL_DEBUG_MSG( 3, ( "Allocating compression buffer" ) );
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +0200933 ssl->compress_buf = mbedtls_calloc( 1, MBEDTLS_SSL_BUFFER_LEN );
Paul Bakker16770332013-10-11 09:59:44 +0200934 if( ssl->compress_buf == NULL )
935 {
Manuel Pégourié-Gonnardb2a18a22015-05-27 16:29:56 +0200936 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed",
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200937 MBEDTLS_SSL_BUFFER_LEN ) );
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +0200938 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Paul Bakker16770332013-10-11 09:59:44 +0200939 }
940 }
941
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200942 MBEDTLS_SSL_DEBUG_MSG( 3, ( "Initializing zlib states" ) );
Paul Bakker2770fbd2012-07-03 13:30:23 +0000943
Paul Bakker48916f92012-09-16 19:57:18 +0000944 memset( &transform->ctx_deflate, 0, sizeof( transform->ctx_deflate ) );
945 memset( &transform->ctx_inflate, 0, sizeof( transform->ctx_inflate ) );
Paul Bakker2770fbd2012-07-03 13:30:23 +0000946
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +0200947 if( deflateInit( &transform->ctx_deflate,
948 Z_DEFAULT_COMPRESSION ) != Z_OK ||
Paul Bakker48916f92012-09-16 19:57:18 +0000949 inflateInit( &transform->ctx_inflate ) != Z_OK )
Paul Bakker2770fbd2012-07-03 13:30:23 +0000950 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200951 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to initialize compression" ) );
952 return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
Paul Bakker2770fbd2012-07-03 13:30:23 +0000953 }
954 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200955#endif /* MBEDTLS_ZLIB_SUPPORT */
Paul Bakker2770fbd2012-07-03 13:30:23 +0000956
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200957 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= derive keys" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000958
959 return( 0 );
960}
961
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200962#if defined(MBEDTLS_SSL_PROTO_SSL3)
963void ssl_calc_verify_ssl( mbedtls_ssl_context *ssl, unsigned char hash[36] )
Paul Bakker5121ce52009-01-03 21:22:43 +0000964{
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200965 mbedtls_md5_context md5;
966 mbedtls_sha1_context sha1;
Paul Bakker5121ce52009-01-03 21:22:43 +0000967 unsigned char pad_1[48];
968 unsigned char pad_2[48];
969
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200970 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify ssl" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000971
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +0200972 mbedtls_md5_init( &md5 );
973 mbedtls_sha1_init( &sha1 );
974
975 mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
976 mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
Paul Bakker5121ce52009-01-03 21:22:43 +0000977
Paul Bakker380da532012-04-18 16:10:25 +0000978 memset( pad_1, 0x36, 48 );
979 memset( pad_2, 0x5C, 48 );
Paul Bakker5121ce52009-01-03 21:22:43 +0000980
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200981 mbedtls_md5_update( &md5, ssl->session_negotiate->master, 48 );
982 mbedtls_md5_update( &md5, pad_1, 48 );
983 mbedtls_md5_finish( &md5, hash );
Paul Bakker5121ce52009-01-03 21:22:43 +0000984
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200985 mbedtls_md5_starts( &md5 );
986 mbedtls_md5_update( &md5, ssl->session_negotiate->master, 48 );
987 mbedtls_md5_update( &md5, pad_2, 48 );
988 mbedtls_md5_update( &md5, hash, 16 );
989 mbedtls_md5_finish( &md5, hash );
Paul Bakker5121ce52009-01-03 21:22:43 +0000990
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200991 mbedtls_sha1_update( &sha1, ssl->session_negotiate->master, 48 );
992 mbedtls_sha1_update( &sha1, pad_1, 40 );
993 mbedtls_sha1_finish( &sha1, hash + 16 );
Paul Bakker380da532012-04-18 16:10:25 +0000994
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200995 mbedtls_sha1_starts( &sha1 );
996 mbedtls_sha1_update( &sha1, ssl->session_negotiate->master, 48 );
997 mbedtls_sha1_update( &sha1, pad_2, 40 );
998 mbedtls_sha1_update( &sha1, hash + 16, 20 );
999 mbedtls_sha1_finish( &sha1, hash + 16 );
Paul Bakker380da532012-04-18 16:10:25 +00001000
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001001 MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 );
1002 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
Paul Bakker380da532012-04-18 16:10:25 +00001003
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001004 mbedtls_md5_free( &md5 );
1005 mbedtls_sha1_free( &sha1 );
Paul Bakker5b4af392014-06-26 12:09:34 +02001006
Paul Bakker380da532012-04-18 16:10:25 +00001007 return;
1008}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001009#endif /* MBEDTLS_SSL_PROTO_SSL3 */
Paul Bakker380da532012-04-18 16:10:25 +00001010
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001011#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
1012void ssl_calc_verify_tls( mbedtls_ssl_context *ssl, unsigned char hash[36] )
Paul Bakker380da532012-04-18 16:10:25 +00001013{
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001014 mbedtls_md5_context md5;
1015 mbedtls_sha1_context sha1;
Paul Bakker380da532012-04-18 16:10:25 +00001016
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001017 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify tls" ) );
Paul Bakker380da532012-04-18 16:10:25 +00001018
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02001019 mbedtls_md5_init( &md5 );
1020 mbedtls_sha1_init( &sha1 );
1021
1022 mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
1023 mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
Paul Bakker380da532012-04-18 16:10:25 +00001024
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001025 mbedtls_md5_finish( &md5, hash );
1026 mbedtls_sha1_finish( &sha1, hash + 16 );
Paul Bakker380da532012-04-18 16:10:25 +00001027
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001028 MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 );
1029 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
Paul Bakker380da532012-04-18 16:10:25 +00001030
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001031 mbedtls_md5_free( &md5 );
1032 mbedtls_sha1_free( &sha1 );
Paul Bakker5b4af392014-06-26 12:09:34 +02001033
Paul Bakker380da532012-04-18 16:10:25 +00001034 return;
1035}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001036#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
Paul Bakker380da532012-04-18 16:10:25 +00001037
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001038#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
1039#if defined(MBEDTLS_SHA256_C)
1040void ssl_calc_verify_tls_sha256( mbedtls_ssl_context *ssl, unsigned char hash[32] )
Paul Bakker380da532012-04-18 16:10:25 +00001041{
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001042 mbedtls_sha256_context sha256;
Paul Bakker380da532012-04-18 16:10:25 +00001043
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02001044 mbedtls_sha256_init( &sha256 );
1045
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001046 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha256" ) );
Paul Bakker380da532012-04-18 16:10:25 +00001047
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02001048 mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 );
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001049 mbedtls_sha256_finish( &sha256, hash );
Paul Bakker380da532012-04-18 16:10:25 +00001050
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001051 MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 32 );
1052 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
Paul Bakker380da532012-04-18 16:10:25 +00001053
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001054 mbedtls_sha256_free( &sha256 );
Paul Bakker5b4af392014-06-26 12:09:34 +02001055
Paul Bakker380da532012-04-18 16:10:25 +00001056 return;
1057}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001058#endif /* MBEDTLS_SHA256_C */
Paul Bakker380da532012-04-18 16:10:25 +00001059
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001060#if defined(MBEDTLS_SHA512_C)
1061void ssl_calc_verify_tls_sha384( mbedtls_ssl_context *ssl, unsigned char hash[48] )
Paul Bakker380da532012-04-18 16:10:25 +00001062{
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001063 mbedtls_sha512_context sha512;
Paul Bakker380da532012-04-18 16:10:25 +00001064
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02001065 mbedtls_sha512_init( &sha512 );
1066
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001067 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha384" ) );
Paul Bakker380da532012-04-18 16:10:25 +00001068
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001069 mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 );
1070 mbedtls_sha512_finish( &sha512, hash );
Paul Bakker5121ce52009-01-03 21:22:43 +00001071
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001072 MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 48 );
1073 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00001074
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001075 mbedtls_sha512_free( &sha512 );
Paul Bakker5b4af392014-06-26 12:09:34 +02001076
Paul Bakker5121ce52009-01-03 21:22:43 +00001077 return;
1078}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001079#endif /* MBEDTLS_SHA512_C */
1080#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker5121ce52009-01-03 21:22:43 +00001081
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001082#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
1083int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exchange_type_t key_ex )
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001084{
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001085 unsigned char *p = ssl->handshake->premaster;
1086 unsigned char *end = p + sizeof( ssl->handshake->premaster );
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01001087 const unsigned char *psk = ssl->conf->psk;
1088 size_t psk_len = ssl->conf->psk_len;
1089
1090 /* If the psk callback was called, use its result */
1091 if( ssl->handshake->psk != NULL )
1092 {
1093 psk = ssl->handshake->psk;
1094 psk_len = ssl->handshake->psk_len;
1095 }
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001096
1097 /*
1098 * PMS = struct {
1099 * opaque other_secret<0..2^16-1>;
1100 * opaque psk<0..2^16-1>;
1101 * };
1102 * with "other_secret" depending on the particular key exchange
1103 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001104#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
1105 if( key_ex == MBEDTLS_KEY_EXCHANGE_PSK )
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001106 {
Manuel Pégourié-Gonnardbc5e5082015-10-21 12:35:29 +02001107 if( end - p < 2 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001108 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001109
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01001110 *(p++) = (unsigned char)( psk_len >> 8 );
1111 *(p++) = (unsigned char)( psk_len );
Manuel Pégourié-Gonnardbc5e5082015-10-21 12:35:29 +02001112
1113 if( end < p || (size_t)( end - p ) < psk_len )
1114 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
1115
1116 memset( p, 0, psk_len );
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01001117 p += psk_len;
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001118 }
1119 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001120#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */
1121#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
1122 if( key_ex == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
Manuel Pégourié-Gonnard0fae60b2013-10-14 17:39:48 +02001123 {
1124 /*
1125 * other_secret already set by the ClientKeyExchange message,
1126 * and is 48 bytes long
1127 */
1128 *p++ = 0;
1129 *p++ = 48;
1130 p += 48;
1131 }
1132 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001133#endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
1134#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
1135 if( key_ex == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001136 {
Manuel Pégourié-Gonnard1b62c7f2013-10-14 14:02:19 +02001137 int ret;
Manuel Pégourié-Gonnard33352052015-06-02 16:17:08 +01001138 size_t len;
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001139
Manuel Pégourié-Gonnard8df68632014-06-23 17:56:08 +02001140 /* Write length only when we know the actual value */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001141 if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
Manuel Pégourié-Gonnard33352052015-06-02 16:17:08 +01001142 p + 2, end - ( p + 2 ), &len,
Manuel Pégourié-Gonnard750e4d72015-05-07 12:35:38 +01001143 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001144 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001145 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001146 return( ret );
1147 }
Manuel Pégourié-Gonnard8df68632014-06-23 17:56:08 +02001148 *(p++) = (unsigned char)( len >> 8 );
1149 *(p++) = (unsigned char)( len );
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001150 p += len;
1151
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001152 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001153 }
1154 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001155#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
1156#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
1157 if( key_ex == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001158 {
Manuel Pégourié-Gonnard1b62c7f2013-10-14 14:02:19 +02001159 int ret;
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001160 size_t zlen;
1161
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001162 if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &zlen,
Paul Bakker66d5d072014-06-17 16:39:18 +02001163 p + 2, end - ( p + 2 ),
Manuel Pégourié-Gonnard750e4d72015-05-07 12:35:38 +01001164 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001165 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001166 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001167 return( ret );
1168 }
1169
1170 *(p++) = (unsigned char)( zlen >> 8 );
1171 *(p++) = (unsigned char)( zlen );
1172 p += zlen;
1173
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001174 MBEDTLS_SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z );
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001175 }
1176 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001177#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001178 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001179 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1180 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001181 }
1182
1183 /* opaque psk<0..2^16-1>; */
Manuel Pégourié-Gonnardbc5e5082015-10-21 12:35:29 +02001184 if( end - p < 2 )
1185 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnardb2bf5a12014-03-25 16:28:12 +01001186
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01001187 *(p++) = (unsigned char)( psk_len >> 8 );
1188 *(p++) = (unsigned char)( psk_len );
Manuel Pégourié-Gonnardbc5e5082015-10-21 12:35:29 +02001189
1190 if( end < p || (size_t)( end - p ) < psk_len )
1191 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
1192
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01001193 memcpy( p, psk, psk_len );
1194 p += psk_len;
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001195
1196 ssl->handshake->pmslen = p - ssl->handshake->premaster;
1197
1198 return( 0 );
1199}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001200#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001201
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001202#if defined(MBEDTLS_SSL_PROTO_SSL3)
Paul Bakker5121ce52009-01-03 21:22:43 +00001203/*
1204 * SSLv3.0 MAC functions
1205 */
Manuel Pégourié-Gonnard464147c2017-12-18 18:04:59 +01001206static void ssl_mac( mbedtls_md_context_t *md_ctx,
1207 const unsigned char *secret,
1208 const unsigned char *buf, size_t len,
1209 const unsigned char *ctr, int type,
1210 unsigned char out[20] )
Paul Bakker5121ce52009-01-03 21:22:43 +00001211{
1212 unsigned char header[11];
1213 unsigned char padding[48];
Manuel Pégourié-Gonnard8d4ad072014-07-13 14:43:28 +02001214 int padlen;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001215 int md_size = mbedtls_md_get_size( md_ctx->md_info );
1216 int md_type = mbedtls_md_get_type( md_ctx->md_info );
Paul Bakker68884e32013-01-07 18:20:04 +01001217
Manuel Pégourié-Gonnard8d4ad072014-07-13 14:43:28 +02001218 /* Only MD5 and SHA-1 supported */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001219 if( md_type == MBEDTLS_MD_MD5 )
Paul Bakker68884e32013-01-07 18:20:04 +01001220 padlen = 48;
Manuel Pégourié-Gonnard8d4ad072014-07-13 14:43:28 +02001221 else
Paul Bakker68884e32013-01-07 18:20:04 +01001222 padlen = 40;
Paul Bakker5121ce52009-01-03 21:22:43 +00001223
1224 memcpy( header, ctr, 8 );
1225 header[ 8] = (unsigned char) type;
1226 header[ 9] = (unsigned char)( len >> 8 );
1227 header[10] = (unsigned char)( len );
1228
Paul Bakker68884e32013-01-07 18:20:04 +01001229 memset( padding, 0x36, padlen );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001230 mbedtls_md_starts( md_ctx );
1231 mbedtls_md_update( md_ctx, secret, md_size );
1232 mbedtls_md_update( md_ctx, padding, padlen );
1233 mbedtls_md_update( md_ctx, header, 11 );
1234 mbedtls_md_update( md_ctx, buf, len );
Manuel Pégourié-Gonnard464147c2017-12-18 18:04:59 +01001235 mbedtls_md_finish( md_ctx, out );
Paul Bakker5121ce52009-01-03 21:22:43 +00001236
Paul Bakker68884e32013-01-07 18:20:04 +01001237 memset( padding, 0x5C, padlen );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001238 mbedtls_md_starts( md_ctx );
1239 mbedtls_md_update( md_ctx, secret, md_size );
1240 mbedtls_md_update( md_ctx, padding, padlen );
Manuel Pégourié-Gonnard464147c2017-12-18 18:04:59 +01001241 mbedtls_md_update( md_ctx, out, md_size );
1242 mbedtls_md_finish( md_ctx, out );
Paul Bakker5f70b252012-09-13 14:23:06 +00001243}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001244#endif /* MBEDTLS_SSL_PROTO_SSL3 */
Paul Bakker5f70b252012-09-13 14:23:06 +00001245
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001246#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER) || \
1247 ( defined(MBEDTLS_CIPHER_MODE_CBC) && \
1248 ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) ) )
Manuel Pégourié-Gonnard8408a942015-04-09 12:14:31 +02001249#define SSL_SOME_MODES_USE_MAC
Manuel Pégourié-Gonnard8e4b3372014-11-17 15:06:13 +01001250#endif
1251
Manuel Pégourié-Gonnard0098e7d2014-10-28 13:08:59 +01001252/*
Paul Bakker5121ce52009-01-03 21:22:43 +00001253 * Encryption/decryption functions
Paul Bakkerf7abd422013-04-16 13:15:56 +02001254 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001255static int ssl_encrypt_buf( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00001256{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001257 mbedtls_cipher_mode_t mode;
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001258 int auth_done = 0;
Paul Bakker5121ce52009-01-03 21:22:43 +00001259
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001260 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> encrypt buf" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00001261
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001262 if( ssl->session_out == NULL || ssl->transform_out == NULL )
1263 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001264 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1265 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001266 }
1267
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001268 mode = mbedtls_cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc );
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001269
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001270 MBEDTLS_SSL_DEBUG_BUF( 4, "before encrypt: output payload",
Manuel Pégourié-Gonnard60346be2014-11-21 11:38:37 +01001271 ssl->out_msg, ssl->out_msglen );
1272
Paul Bakker5121ce52009-01-03 21:22:43 +00001273 /*
Manuel Pégourié-Gonnard0098e7d2014-10-28 13:08:59 +01001274 * Add MAC before if needed
Paul Bakker5121ce52009-01-03 21:22:43 +00001275 */
Manuel Pégourié-Gonnard8408a942015-04-09 12:14:31 +02001276#if defined(SSL_SOME_MODES_USE_MAC)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001277 if( mode == MBEDTLS_MODE_STREAM ||
1278 ( mode == MBEDTLS_MODE_CBC
1279#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
1280 && ssl->session_out->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001281#endif
1282 ) )
Paul Bakker5121ce52009-01-03 21:22:43 +00001283 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001284#if defined(MBEDTLS_SSL_PROTO_SSL3)
1285 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001286 {
Manuel Pégourié-Gonnard464147c2017-12-18 18:04:59 +01001287 unsigned char mac[20]; /* SHA-1 at most */
1288
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001289 ssl_mac( &ssl->transform_out->md_ctx_enc,
1290 ssl->transform_out->mac_enc,
1291 ssl->out_msg, ssl->out_msglen,
Manuel Pégourié-Gonnard464147c2017-12-18 18:04:59 +01001292 ssl->out_ctr, ssl->out_msgtype,
1293 mac );
1294
1295 memcpy( ssl->out_msg + ssl->out_msglen, mac, ssl->transform_out->maclen );
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001296 }
1297 else
Paul Bakkerd2f068e2013-08-27 21:19:20 +02001298#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001299#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
1300 defined(MBEDTLS_SSL_PROTO_TLS1_2)
1301 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001302 {
Hanno Becker992b6872017-11-09 18:57:39 +00001303 unsigned char mac[MBEDTLS_SSL_MAC_ADD];
1304
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001305 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_ctr, 8 );
1306 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_hdr, 3 );
1307 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_len, 2 );
1308 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc,
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001309 ssl->out_msg, ssl->out_msglen );
Hanno Becker992b6872017-11-09 18:57:39 +00001310 mbedtls_md_hmac_finish( &ssl->transform_out->md_ctx_enc, mac );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001311 mbedtls_md_hmac_reset( &ssl->transform_out->md_ctx_enc );
Hanno Becker992b6872017-11-09 18:57:39 +00001312
1313 memcpy( ssl->out_msg + ssl->out_msglen, mac, ssl->transform_out->maclen );
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001314 }
1315 else
Paul Bakkerd2f068e2013-08-27 21:19:20 +02001316#endif
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001317 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001318 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1319 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001320 }
1321
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001322 MBEDTLS_SSL_DEBUG_BUF( 4, "computed mac",
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001323 ssl->out_msg + ssl->out_msglen,
1324 ssl->transform_out->maclen );
1325
1326 ssl->out_msglen += ssl->transform_out->maclen;
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001327 auth_done++;
Paul Bakker577e0062013-08-28 11:57:20 +02001328 }
Manuel Pégourié-Gonnard2e5ee322014-05-14 13:09:22 +02001329#endif /* AEAD not the only option */
Paul Bakker5121ce52009-01-03 21:22:43 +00001330
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001331 /*
1332 * Encrypt
1333 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001334#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER)
1335 if( mode == MBEDTLS_MODE_STREAM )
Paul Bakker5121ce52009-01-03 21:22:43 +00001336 {
Paul Bakkerea6ad3f2013-09-02 14:57:01 +02001337 int ret;
1338 size_t olen = 0;
1339
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001340 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
Paul Bakker5121ce52009-01-03 21:22:43 +00001341 "including %d bytes of padding",
1342 ssl->out_msglen, 0 ) );
1343
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001344 if( ( ret = mbedtls_cipher_crypt( &ssl->transform_out->cipher_ctx_enc,
Paul Bakker45125bc2013-09-04 16:47:11 +02001345 ssl->transform_out->iv_enc,
Manuel Pégourié-Gonnard8764d272014-05-13 11:52:02 +02001346 ssl->transform_out->ivlen,
1347 ssl->out_msg, ssl->out_msglen,
1348 ssl->out_msg, &olen ) ) != 0 )
Paul Bakker45125bc2013-09-04 16:47:11 +02001349 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001350 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
Paul Bakkerea6ad3f2013-09-02 14:57:01 +02001351 return( ret );
1352 }
1353
1354 if( ssl->out_msglen != olen )
1355 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001356 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1357 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakkerea6ad3f2013-09-02 14:57:01 +02001358 }
Paul Bakker5121ce52009-01-03 21:22:43 +00001359 }
Paul Bakker68884e32013-01-07 18:20:04 +01001360 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001361#endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */
1362#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C)
1363 if( mode == MBEDTLS_MODE_GCM ||
1364 mode == MBEDTLS_MODE_CCM )
Paul Bakkerca4ab492012-04-18 14:23:57 +00001365 {
Manuel Pégourié-Gonnard2e5ee322014-05-14 13:09:22 +02001366 int ret;
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001367 size_t enc_msglen, olen;
Paul Bakkerca4ab492012-04-18 14:23:57 +00001368 unsigned char *enc_msg;
1369 unsigned char add_data[13];
Manuel Pégourié-Gonnard2e5ee322014-05-14 13:09:22 +02001370 unsigned char taglen = ssl->transform_out->ciphersuite_info->flags &
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001371 MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
Paul Bakkerca4ab492012-04-18 14:23:57 +00001372
Paul Bakkerca4ab492012-04-18 14:23:57 +00001373 memcpy( add_data, ssl->out_ctr, 8 );
1374 add_data[8] = ssl->out_msgtype;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001375 mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001376 ssl->conf->transport, add_data + 9 );
Paul Bakkerca4ab492012-04-18 14:23:57 +00001377 add_data[11] = ( ssl->out_msglen >> 8 ) & 0xFF;
1378 add_data[12] = ssl->out_msglen & 0xFF;
1379
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001380 MBEDTLS_SSL_DEBUG_BUF( 4, "additional data used for AEAD",
Paul Bakkerca4ab492012-04-18 14:23:57 +00001381 add_data, 13 );
1382
Paul Bakker68884e32013-01-07 18:20:04 +01001383 /*
1384 * Generate IV
1385 */
Manuel Pégourié-Gonnardd056ce02014-10-29 22:29:20 +01001386 if( ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen != 8 )
1387 {
1388 /* Reminder if we ever add an AEAD mode with a different size */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001389 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1390 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardd056ce02014-10-29 22:29:20 +01001391 }
1392
1393 memcpy( ssl->transform_out->iv_enc + ssl->transform_out->fixed_ivlen,
1394 ssl->out_ctr, 8 );
1395 memcpy( ssl->out_iv, ssl->out_ctr, 8 );
Paul Bakkerca4ab492012-04-18 14:23:57 +00001396
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001397 MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", ssl->out_iv,
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +02001398 ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen );
Manuel Pégourié-Gonnard226d5da2013-09-05 13:19:22 +02001399
Paul Bakker68884e32013-01-07 18:20:04 +01001400 /*
1401 * Fix pointer positions and message length with added IV
1402 */
1403 enc_msg = ssl->out_msg;
1404 enc_msglen = ssl->out_msglen;
1405 ssl->out_msglen += ssl->transform_out->ivlen -
1406 ssl->transform_out->fixed_ivlen;
Paul Bakkerca4ab492012-04-18 14:23:57 +00001407
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001408 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
Paul Bakker68884e32013-01-07 18:20:04 +01001409 "including %d bytes of padding",
1410 ssl->out_msglen, 0 ) );
Paul Bakkerca4ab492012-04-18 14:23:57 +00001411
Paul Bakker68884e32013-01-07 18:20:04 +01001412 /*
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001413 * Encrypt and authenticate
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001414 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001415 if( ( ret = mbedtls_cipher_auth_encrypt( &ssl->transform_out->cipher_ctx_enc,
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001416 ssl->transform_out->iv_enc,
1417 ssl->transform_out->ivlen,
1418 add_data, 13,
1419 enc_msg, enc_msglen,
1420 enc_msg, &olen,
Manuel Pégourié-Gonnard2e5ee322014-05-14 13:09:22 +02001421 enc_msg + enc_msglen, taglen ) ) != 0 )
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001422 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001423 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_encrypt", ret );
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001424 return( ret );
1425 }
1426
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001427 if( olen != enc_msglen )
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001428 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001429 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1430 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001431 }
1432
Manuel Pégourié-Gonnard2e5ee322014-05-14 13:09:22 +02001433 ssl->out_msglen += taglen;
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001434 auth_done++;
Paul Bakkerca4ab492012-04-18 14:23:57 +00001435
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001436 MBEDTLS_SSL_DEBUG_BUF( 4, "after encrypt: tag", enc_msg + enc_msglen, taglen );
Paul Bakkerca4ab492012-04-18 14:23:57 +00001437 }
Paul Bakker5121ce52009-01-03 21:22:43 +00001438 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001439#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */
1440#if defined(MBEDTLS_CIPHER_MODE_CBC) && \
1441 ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) )
1442 if( mode == MBEDTLS_MODE_CBC )
Paul Bakker5121ce52009-01-03 21:22:43 +00001443 {
Paul Bakkerda02a7f2013-08-31 17:25:14 +02001444 int ret;
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001445 unsigned char *enc_msg;
Manuel Pégourié-Gonnard34c10112014-03-25 13:36:22 +01001446 size_t enc_msglen, padlen, olen = 0, i;
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001447
Paul Bakker48916f92012-09-16 19:57:18 +00001448 padlen = ssl->transform_out->ivlen - ( ssl->out_msglen + 1 ) %
1449 ssl->transform_out->ivlen;
1450 if( padlen == ssl->transform_out->ivlen )
Paul Bakker5121ce52009-01-03 21:22:43 +00001451 padlen = 0;
1452
1453 for( i = 0; i <= padlen; i++ )
1454 ssl->out_msg[ssl->out_msglen + i] = (unsigned char) padlen;
1455
1456 ssl->out_msglen += padlen + 1;
1457
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001458 enc_msglen = ssl->out_msglen;
1459 enc_msg = ssl->out_msg;
1460
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001461#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001462 /*
Paul Bakker1ef83d62012-04-11 12:09:53 +00001463 * Prepend per-record IV for block cipher in TLS v1.1 and up as per
1464 * Method 1 (6.2.3.2. in RFC4346 and RFC5246)
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001465 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001466 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001467 {
1468 /*
1469 * Generate IV
1470 */
Manuel Pégourié-Gonnardea356662015-08-27 12:02:40 +02001471 ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->transform_out->iv_enc,
Paul Bakker48916f92012-09-16 19:57:18 +00001472 ssl->transform_out->ivlen );
Paul Bakkera3d195c2011-11-27 21:07:34 +00001473 if( ret != 0 )
1474 return( ret );
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001475
Paul Bakker92be97b2013-01-02 17:30:03 +01001476 memcpy( ssl->out_iv, ssl->transform_out->iv_enc,
Paul Bakker48916f92012-09-16 19:57:18 +00001477 ssl->transform_out->ivlen );
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001478
1479 /*
1480 * Fix pointer positions and message length with added IV
1481 */
Paul Bakker92be97b2013-01-02 17:30:03 +01001482 enc_msg = ssl->out_msg;
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001483 enc_msglen = ssl->out_msglen;
Paul Bakker48916f92012-09-16 19:57:18 +00001484 ssl->out_msglen += ssl->transform_out->ivlen;
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001485 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001486#endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001487
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001488 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001489 "including %d bytes of IV and %d bytes of padding",
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +02001490 ssl->out_msglen, ssl->transform_out->ivlen,
1491 padlen + 1 ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00001492
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001493 if( ( ret = mbedtls_cipher_crypt( &ssl->transform_out->cipher_ctx_enc,
Paul Bakker45125bc2013-09-04 16:47:11 +02001494 ssl->transform_out->iv_enc,
Manuel Pégourié-Gonnard8764d272014-05-13 11:52:02 +02001495 ssl->transform_out->ivlen,
1496 enc_msg, enc_msglen,
1497 enc_msg, &olen ) ) != 0 )
Paul Bakker45125bc2013-09-04 16:47:11 +02001498 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001499 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
Paul Bakkercca5b812013-08-31 17:40:26 +02001500 return( ret );
1501 }
Paul Bakkerda02a7f2013-08-31 17:25:14 +02001502
Paul Bakkercca5b812013-08-31 17:40:26 +02001503 if( enc_msglen != olen )
1504 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001505 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1506 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakkercca5b812013-08-31 17:40:26 +02001507 }
Paul Bakkerda02a7f2013-08-31 17:25:14 +02001508
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001509#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
1510 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 )
Paul Bakkercca5b812013-08-31 17:40:26 +02001511 {
1512 /*
1513 * Save IV in SSL3 and TLS1
1514 */
1515 memcpy( ssl->transform_out->iv_enc,
1516 ssl->transform_out->cipher_ctx_enc.iv,
1517 ssl->transform_out->ivlen );
Paul Bakker5121ce52009-01-03 21:22:43 +00001518 }
Paul Bakkercca5b812013-08-31 17:40:26 +02001519#endif
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001520
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001521#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001522 if( auth_done == 0 )
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001523 {
1524 /*
1525 * MAC(MAC_write_key, seq_num +
1526 * TLSCipherText.type +
1527 * TLSCipherText.version +
Manuel Pégourié-Gonnard08558e52014-11-04 14:40:21 +01001528 * length_of( (IV +) ENC(...) ) +
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001529 * IV + // except for TLS 1.0
1530 * ENC(content + padding + padding_length));
1531 */
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001532 unsigned char pseudo_hdr[13];
1533
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001534 MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) );
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001535
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001536 memcpy( pseudo_hdr + 0, ssl->out_ctr, 8 );
1537 memcpy( pseudo_hdr + 8, ssl->out_hdr, 3 );
Manuel Pégourié-Gonnard08558e52014-11-04 14:40:21 +01001538 pseudo_hdr[11] = (unsigned char)( ( ssl->out_msglen >> 8 ) & 0xFF );
1539 pseudo_hdr[12] = (unsigned char)( ( ssl->out_msglen ) & 0xFF );
1540
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001541 MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 );
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001542
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001543 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, pseudo_hdr, 13 );
1544 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc,
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001545 ssl->out_iv, ssl->out_msglen );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001546 mbedtls_md_hmac_finish( &ssl->transform_out->md_ctx_enc,
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001547 ssl->out_iv + ssl->out_msglen );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001548 mbedtls_md_hmac_reset( &ssl->transform_out->md_ctx_enc );
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001549
1550 ssl->out_msglen += ssl->transform_out->maclen;
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001551 auth_done++;
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001552 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001553#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
Paul Bakker5121ce52009-01-03 21:22:43 +00001554 }
Manuel Pégourié-Gonnardf7dc3782013-09-13 14:10:44 +02001555 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001556#endif /* MBEDTLS_CIPHER_MODE_CBC &&
1557 ( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C ) */
Manuel Pégourié-Gonnardf7dc3782013-09-13 14:10:44 +02001558 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001559 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1560 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardf7dc3782013-09-13 14:10:44 +02001561 }
Paul Bakker5121ce52009-01-03 21:22:43 +00001562
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001563 /* Make extra sure authentication was performed, exactly once */
1564 if( auth_done != 1 )
1565 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001566 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1567 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001568 }
1569
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001570 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= encrypt buf" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00001571
1572 return( 0 );
1573}
1574
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001575static int ssl_decrypt_buf( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00001576{
Paul Bakker1e5369c2013-12-19 16:40:57 +01001577 size_t i;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001578 mbedtls_cipher_mode_t mode;
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001579 int auth_done = 0;
Manuel Pégourié-Gonnard8408a942015-04-09 12:14:31 +02001580#if defined(SSL_SOME_MODES_USE_MAC)
Paul Bakker1e5369c2013-12-19 16:40:57 +01001581 size_t padlen = 0, correct = 1;
1582#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00001583
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001584 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decrypt buf" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00001585
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001586 if( ssl->session_in == NULL || ssl->transform_in == NULL )
1587 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001588 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1589 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001590 }
1591
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001592 mode = mbedtls_cipher_get_cipher_mode( &ssl->transform_in->cipher_ctx_dec );
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001593
Paul Bakker48916f92012-09-16 19:57:18 +00001594 if( ssl->in_msglen < ssl->transform_in->minlen )
Paul Bakker5121ce52009-01-03 21:22:43 +00001595 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001596 MBEDTLS_SSL_DEBUG_MSG( 1, ( "in_msglen (%d) < minlen (%d)",
Paul Bakker48916f92012-09-16 19:57:18 +00001597 ssl->in_msglen, ssl->transform_in->minlen ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001598 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Paul Bakker5121ce52009-01-03 21:22:43 +00001599 }
1600
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001601#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER)
1602 if( mode == MBEDTLS_MODE_STREAM )
Paul Bakker68884e32013-01-07 18:20:04 +01001603 {
Paul Bakkerea6ad3f2013-09-02 14:57:01 +02001604 int ret;
1605 size_t olen = 0;
1606
Paul Bakker68884e32013-01-07 18:20:04 +01001607 padlen = 0;
1608
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001609 if( ( ret = mbedtls_cipher_crypt( &ssl->transform_in->cipher_ctx_dec,
Paul Bakker45125bc2013-09-04 16:47:11 +02001610 ssl->transform_in->iv_dec,
Manuel Pégourié-Gonnard8764d272014-05-13 11:52:02 +02001611 ssl->transform_in->ivlen,
1612 ssl->in_msg, ssl->in_msglen,
1613 ssl->in_msg, &olen ) ) != 0 )
Paul Bakker45125bc2013-09-04 16:47:11 +02001614 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001615 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
Paul Bakkerea6ad3f2013-09-02 14:57:01 +02001616 return( ret );
1617 }
1618
1619 if( ssl->in_msglen != olen )
1620 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001621 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1622 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakkerea6ad3f2013-09-02 14:57:01 +02001623 }
Paul Bakker5121ce52009-01-03 21:22:43 +00001624 }
Paul Bakker68884e32013-01-07 18:20:04 +01001625 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001626#endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */
1627#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C)
1628 if( mode == MBEDTLS_MODE_GCM ||
1629 mode == MBEDTLS_MODE_CCM )
Paul Bakkerca4ab492012-04-18 14:23:57 +00001630 {
Manuel Pégourié-Gonnard2e5ee322014-05-14 13:09:22 +02001631 int ret;
1632 size_t dec_msglen, olen;
Paul Bakkerca4ab492012-04-18 14:23:57 +00001633 unsigned char *dec_msg;
1634 unsigned char *dec_msg_result;
Paul Bakkerca4ab492012-04-18 14:23:57 +00001635 unsigned char add_data[13];
Manuel Pégourié-Gonnard2e5ee322014-05-14 13:09:22 +02001636 unsigned char taglen = ssl->transform_in->ciphersuite_info->flags &
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001637 MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
Manuel Pégourié-Gonnard9de64f52015-07-01 15:51:43 +02001638 size_t explicit_iv_len = ssl->transform_in->ivlen -
1639 ssl->transform_in->fixed_ivlen;
Paul Bakkerca4ab492012-04-18 14:23:57 +00001640
Manuel Pégourié-Gonnard9de64f52015-07-01 15:51:43 +02001641 if( ssl->in_msglen < explicit_iv_len + taglen )
Manuel Pégourié-Gonnard0bcc4e12014-06-17 10:54:17 +02001642 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001643 MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < explicit_iv_len (%d) "
Manuel Pégourié-Gonnard0bcc4e12014-06-17 10:54:17 +02001644 "+ taglen (%d)", ssl->in_msglen,
1645 explicit_iv_len, taglen ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001646 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Manuel Pégourié-Gonnard0bcc4e12014-06-17 10:54:17 +02001647 }
1648 dec_msglen = ssl->in_msglen - explicit_iv_len - taglen;
1649
Paul Bakker68884e32013-01-07 18:20:04 +01001650 dec_msg = ssl->in_msg;
1651 dec_msg_result = ssl->in_msg;
1652 ssl->in_msglen = dec_msglen;
1653
1654 memcpy( add_data, ssl->in_ctr, 8 );
1655 add_data[8] = ssl->in_msgtype;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001656 mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001657 ssl->conf->transport, add_data + 9 );
Paul Bakker68884e32013-01-07 18:20:04 +01001658 add_data[11] = ( ssl->in_msglen >> 8 ) & 0xFF;
1659 add_data[12] = ssl->in_msglen & 0xFF;
1660
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001661 MBEDTLS_SSL_DEBUG_BUF( 4, "additional data used for AEAD",
Paul Bakker68884e32013-01-07 18:20:04 +01001662 add_data, 13 );
1663
1664 memcpy( ssl->transform_in->iv_dec + ssl->transform_in->fixed_ivlen,
1665 ssl->in_iv,
1666 ssl->transform_in->ivlen - ssl->transform_in->fixed_ivlen );
1667
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001668 MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", ssl->transform_in->iv_dec,
Paul Bakker68884e32013-01-07 18:20:04 +01001669 ssl->transform_in->ivlen );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001670 MBEDTLS_SSL_DEBUG_BUF( 4, "TAG used", dec_msg + dec_msglen, taglen );
Paul Bakker68884e32013-01-07 18:20:04 +01001671
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001672 /*
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001673 * Decrypt and authenticate
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001674 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001675 if( ( ret = mbedtls_cipher_auth_decrypt( &ssl->transform_in->cipher_ctx_dec,
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001676 ssl->transform_in->iv_dec,
1677 ssl->transform_in->ivlen,
1678 add_data, 13,
1679 dec_msg, dec_msglen,
1680 dec_msg_result, &olen,
Manuel Pégourié-Gonnard2e5ee322014-05-14 13:09:22 +02001681 dec_msg + dec_msglen, taglen ) ) != 0 )
Paul Bakkerca4ab492012-04-18 14:23:57 +00001682 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001683 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_decrypt", ret );
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001684
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001685 if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED )
1686 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001687
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001688 return( ret );
1689 }
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001690 auth_done++;
Paul Bakkerca4ab492012-04-18 14:23:57 +00001691
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001692 if( olen != dec_msglen )
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001693 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001694 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1695 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001696 }
Paul Bakkerca4ab492012-04-18 14:23:57 +00001697 }
Paul Bakker5121ce52009-01-03 21:22:43 +00001698 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001699#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */
1700#if defined(MBEDTLS_CIPHER_MODE_CBC) && \
1701 ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) )
1702 if( mode == MBEDTLS_MODE_CBC )
Paul Bakker5121ce52009-01-03 21:22:43 +00001703 {
Paul Bakker45829992013-01-03 14:52:21 +01001704 /*
1705 * Decrypt and check the padding
1706 */
Paul Bakkerda02a7f2013-08-31 17:25:14 +02001707 int ret;
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001708 unsigned char *dec_msg;
1709 unsigned char *dec_msg_result;
Paul Bakker23986e52011-04-24 08:57:21 +00001710 size_t dec_msglen;
Paul Bakkere47b34b2013-02-27 14:48:00 +01001711 size_t minlen = 0;
Paul Bakkerda02a7f2013-08-31 17:25:14 +02001712 size_t olen = 0;
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001713
Paul Bakker5121ce52009-01-03 21:22:43 +00001714 /*
Paul Bakker45829992013-01-03 14:52:21 +01001715 * Check immediate ciphertext sanity
Paul Bakker5121ce52009-01-03 21:22:43 +00001716 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001717#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
1718 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
Paul Bakker45829992013-01-03 14:52:21 +01001719 minlen += ssl->transform_in->ivlen;
Paul Bakkerd2f068e2013-08-27 21:19:20 +02001720#endif
Paul Bakker45829992013-01-03 14:52:21 +01001721
1722 if( ssl->in_msglen < minlen + ssl->transform_in->ivlen ||
1723 ssl->in_msglen < minlen + ssl->transform_in->maclen + 1 )
1724 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001725 MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < max( ivlen(%d), maclen (%d) "
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +02001726 "+ 1 ) ( + expl IV )", ssl->in_msglen,
1727 ssl->transform_in->ivlen,
1728 ssl->transform_in->maclen ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001729 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Paul Bakker45829992013-01-03 14:52:21 +01001730 }
1731
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001732 dec_msglen = ssl->in_msglen;
1733 dec_msg = ssl->in_msg;
1734 dec_msg_result = ssl->in_msg;
1735
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001736 /*
1737 * Authenticate before decrypt if enabled
1738 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001739#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
1740 if( ssl->session_in->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED )
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001741 {
Hanno Becker992b6872017-11-09 18:57:39 +00001742 unsigned char mac_expect[MBEDTLS_SSL_MAC_ADD];
Manuel Pégourié-Gonnard08558e52014-11-04 14:40:21 +01001743 unsigned char pseudo_hdr[13];
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001744
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001745 MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) );
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001746
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001747 dec_msglen -= ssl->transform_in->maclen;
1748 ssl->in_msglen -= ssl->transform_in->maclen;
1749
Manuel Pégourié-Gonnard08558e52014-11-04 14:40:21 +01001750 memcpy( pseudo_hdr + 0, ssl->in_ctr, 8 );
1751 memcpy( pseudo_hdr + 8, ssl->in_hdr, 3 );
1752 pseudo_hdr[11] = (unsigned char)( ( ssl->in_msglen >> 8 ) & 0xFF );
1753 pseudo_hdr[12] = (unsigned char)( ( ssl->in_msglen ) & 0xFF );
1754
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001755 MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 );
Manuel Pégourié-Gonnard08558e52014-11-04 14:40:21 +01001756
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001757 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, pseudo_hdr, 13 );
1758 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec,
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001759 ssl->in_iv, ssl->in_msglen );
Hanno Becker992b6872017-11-09 18:57:39 +00001760 mbedtls_md_hmac_finish( &ssl->transform_in->md_ctx_dec, mac_expect );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001761 mbedtls_md_hmac_reset( &ssl->transform_in->md_ctx_dec );
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001762
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001763 MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", ssl->in_iv + ssl->in_msglen,
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001764 ssl->transform_in->maclen );
Hanno Becker992b6872017-11-09 18:57:39 +00001765 MBEDTLS_SSL_DEBUG_BUF( 4, "expected mac", mac_expect,
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001766 ssl->transform_in->maclen );
1767
Hanno Becker992b6872017-11-09 18:57:39 +00001768 if( mbedtls_ssl_safer_memcmp( ssl->in_iv + ssl->in_msglen, mac_expect,
1769 ssl->transform_in->maclen ) != 0 )
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001770 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001771 MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) );
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001772
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001773 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001774 }
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001775 auth_done++;
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001776 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001777#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001778
1779 /*
1780 * Check length sanity
1781 */
1782 if( ssl->in_msglen % ssl->transform_in->ivlen != 0 )
1783 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001784 MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) %% ivlen (%d) != 0",
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001785 ssl->in_msglen, ssl->transform_in->ivlen ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001786 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001787 }
1788
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001789#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001790 /*
Paul Bakker1ef83d62012-04-11 12:09:53 +00001791 * Initialize for prepended IV for block cipher in TLS v1.1 and up
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001792 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001793 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001794 {
Paul Bakker48916f92012-09-16 19:57:18 +00001795 dec_msglen -= ssl->transform_in->ivlen;
1796 ssl->in_msglen -= ssl->transform_in->ivlen;
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001797
Paul Bakker48916f92012-09-16 19:57:18 +00001798 for( i = 0; i < ssl->transform_in->ivlen; i++ )
Paul Bakker92be97b2013-01-02 17:30:03 +01001799 ssl->transform_in->iv_dec[i] = ssl->in_iv[i];
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001800 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001801#endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001802
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001803 if( ( ret = mbedtls_cipher_crypt( &ssl->transform_in->cipher_ctx_dec,
Paul Bakker45125bc2013-09-04 16:47:11 +02001804 ssl->transform_in->iv_dec,
Manuel Pégourié-Gonnard8764d272014-05-13 11:52:02 +02001805 ssl->transform_in->ivlen,
1806 dec_msg, dec_msglen,
1807 dec_msg_result, &olen ) ) != 0 )
Paul Bakker45125bc2013-09-04 16:47:11 +02001808 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001809 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
Paul Bakkercca5b812013-08-31 17:40:26 +02001810 return( ret );
1811 }
Paul Bakkerda02a7f2013-08-31 17:25:14 +02001812
Paul Bakkercca5b812013-08-31 17:40:26 +02001813 if( dec_msglen != olen )
1814 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001815 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1816 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakkercca5b812013-08-31 17:40:26 +02001817 }
Paul Bakkerda02a7f2013-08-31 17:25:14 +02001818
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001819#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
1820 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 )
Paul Bakkercca5b812013-08-31 17:40:26 +02001821 {
1822 /*
1823 * Save IV in SSL3 and TLS1
1824 */
1825 memcpy( ssl->transform_in->iv_dec,
1826 ssl->transform_in->cipher_ctx_dec.iv,
1827 ssl->transform_in->ivlen );
Paul Bakker5121ce52009-01-03 21:22:43 +00001828 }
Paul Bakkercca5b812013-08-31 17:40:26 +02001829#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00001830
1831 padlen = 1 + ssl->in_msg[ssl->in_msglen - 1];
Paul Bakker45829992013-01-03 14:52:21 +01001832
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001833 if( ssl->in_msglen < ssl->transform_in->maclen + padlen &&
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001834 auth_done == 0 )
Paul Bakker45829992013-01-03 14:52:21 +01001835 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001836#if defined(MBEDTLS_SSL_DEBUG_ALL)
1837 MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < maclen (%d) + padlen (%d)",
Paul Bakker45829992013-01-03 14:52:21 +01001838 ssl->in_msglen, ssl->transform_in->maclen, padlen ) );
Paul Bakkerd66f0702013-01-31 16:57:45 +01001839#endif
Paul Bakker45829992013-01-03 14:52:21 +01001840 padlen = 0;
Paul Bakker45829992013-01-03 14:52:21 +01001841 correct = 0;
1842 }
Paul Bakker5121ce52009-01-03 21:22:43 +00001843
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001844#if defined(MBEDTLS_SSL_PROTO_SSL3)
1845 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00001846 {
Paul Bakker48916f92012-09-16 19:57:18 +00001847 if( padlen > ssl->transform_in->ivlen )
Paul Bakker5121ce52009-01-03 21:22:43 +00001848 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001849#if defined(MBEDTLS_SSL_DEBUG_ALL)
1850 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding length: is %d, "
Paul Bakker5121ce52009-01-03 21:22:43 +00001851 "should be no more than %d",
Paul Bakker48916f92012-09-16 19:57:18 +00001852 padlen, ssl->transform_in->ivlen ) );
Paul Bakkerd66f0702013-01-31 16:57:45 +01001853#endif
Paul Bakker45829992013-01-03 14:52:21 +01001854 correct = 0;
Paul Bakker5121ce52009-01-03 21:22:43 +00001855 }
1856 }
1857 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001858#endif /* MBEDTLS_SSL_PROTO_SSL3 */
1859#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
1860 defined(MBEDTLS_SSL_PROTO_TLS1_2)
1861 if( ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00001862 {
1863 /*
Paul Bakker45829992013-01-03 14:52:21 +01001864 * TLSv1+: always check the padding up to the first failure
1865 * and fake check up to 256 bytes of padding
Paul Bakker5121ce52009-01-03 21:22:43 +00001866 */
Paul Bakkerca9c87e2013-09-25 18:52:37 +02001867 size_t pad_count = 0, real_count = 1;
Paul Bakkere47b34b2013-02-27 14:48:00 +01001868 size_t padding_idx = ssl->in_msglen - padlen - 1;
1869
Paul Bakker956c9e02013-12-19 14:42:28 +01001870 /*
1871 * Padding is guaranteed to be incorrect if:
Paul Bakker91c61bc2014-03-26 14:06:55 +01001872 * 1. padlen >= ssl->in_msglen
Paul Bakker956c9e02013-12-19 14:42:28 +01001873 *
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001874 * 2. padding_idx >= MBEDTLS_SSL_MAX_CONTENT_LEN +
Paul Bakker61885c72014-04-25 12:59:03 +02001875 * ssl->transform_in->maclen
Paul Bakker956c9e02013-12-19 14:42:28 +01001876 *
1877 * In both cases we reset padding_idx to a safe value (0) to
1878 * prevent out-of-buffer reads.
1879 */
Paul Bakker91c61bc2014-03-26 14:06:55 +01001880 correct &= ( ssl->in_msglen >= padlen + 1 );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001881 correct &= ( padding_idx < MBEDTLS_SSL_MAX_CONTENT_LEN +
Paul Bakker61885c72014-04-25 12:59:03 +02001882 ssl->transform_in->maclen );
Paul Bakker956c9e02013-12-19 14:42:28 +01001883
1884 padding_idx *= correct;
1885
Paul Bakkerca9c87e2013-09-25 18:52:37 +02001886 for( i = 1; i <= 256; i++ )
1887 {
1888 real_count &= ( i <= padlen );
1889 pad_count += real_count *
1890 ( ssl->in_msg[padding_idx + i] == padlen - 1 );
1891 }
Paul Bakkere47b34b2013-02-27 14:48:00 +01001892
1893 correct &= ( pad_count == padlen ); /* Only 1 on correct padding */
Paul Bakkere47b34b2013-02-27 14:48:00 +01001894
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001895#if defined(MBEDTLS_SSL_DEBUG_ALL)
Paul Bakker66d5d072014-06-17 16:39:18 +02001896 if( padlen > 0 && correct == 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001897 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding byte detected" ) );
Paul Bakkerd66f0702013-01-31 16:57:45 +01001898#endif
Paul Bakkere47b34b2013-02-27 14:48:00 +01001899 padlen &= correct * 0x1FF;
Paul Bakker5121ce52009-01-03 21:22:43 +00001900 }
Paul Bakkerd2f068e2013-08-27 21:19:20 +02001901 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001902#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
1903 MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker577e0062013-08-28 11:57:20 +02001904 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001905 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1906 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakker577e0062013-08-28 11:57:20 +02001907 }
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001908
1909 ssl->in_msglen -= padlen;
Paul Bakker5121ce52009-01-03 21:22:43 +00001910 }
Manuel Pégourié-Gonnardf7dc3782013-09-13 14:10:44 +02001911 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001912#endif /* MBEDTLS_CIPHER_MODE_CBC &&
1913 ( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C ) */
Manuel Pégourié-Gonnardf7dc3782013-09-13 14:10:44 +02001914 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001915 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1916 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardf7dc3782013-09-13 14:10:44 +02001917 }
Paul Bakker5121ce52009-01-03 21:22:43 +00001918
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001919 MBEDTLS_SSL_DEBUG_BUF( 4, "raw buffer after decryption",
Paul Bakker5121ce52009-01-03 21:22:43 +00001920 ssl->in_msg, ssl->in_msglen );
1921
1922 /*
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001923 * Authenticate if not done yet.
1924 * Compute the MAC regardless of the padding result (RFC4346, CBCTIME).
Paul Bakker5121ce52009-01-03 21:22:43 +00001925 */
Manuel Pégourié-Gonnard8408a942015-04-09 12:14:31 +02001926#if defined(SSL_SOME_MODES_USE_MAC)
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001927 if( auth_done == 0 )
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001928 {
Hanno Becker992b6872017-11-09 18:57:39 +00001929 unsigned char mac_expect[MBEDTLS_SSL_MAC_ADD];
Paul Bakker1e5369c2013-12-19 16:40:57 +01001930
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001931 ssl->in_msglen -= ssl->transform_in->maclen;
Paul Bakker5121ce52009-01-03 21:22:43 +00001932
Manuel Pégourié-Gonnard507e1e42014-02-13 11:17:34 +01001933 ssl->in_len[0] = (unsigned char)( ssl->in_msglen >> 8 );
1934 ssl->in_len[1] = (unsigned char)( ssl->in_msglen );
Paul Bakker5121ce52009-01-03 21:22:43 +00001935
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001936#if defined(MBEDTLS_SSL_PROTO_SSL3)
1937 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001938 {
1939 ssl_mac( &ssl->transform_in->md_ctx_dec,
1940 ssl->transform_in->mac_dec,
1941 ssl->in_msg, ssl->in_msglen,
Manuel Pégourié-Gonnard464147c2017-12-18 18:04:59 +01001942 ssl->in_ctr, ssl->in_msgtype,
1943 mac_expect );
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001944 }
1945 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001946#endif /* MBEDTLS_SSL_PROTO_SSL3 */
1947#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
1948 defined(MBEDTLS_SSL_PROTO_TLS1_2)
1949 if( ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 )
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001950 {
1951 /*
1952 * Process MAC and always update for padlen afterwards to make
1953 * total time independent of padlen
1954 *
Paul Bakker9af723c2014-05-01 13:03:14 +02001955 * extra_run compensates MAC check for padlen
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001956 *
1957 * Known timing attacks:
1958 * - Lucky Thirteen (http://www.isg.rhul.ac.uk/tls/TLStiming.pdf)
1959 *
1960 * We use ( ( Lx + 8 ) / 64 ) to handle 'negative Lx' values
1961 * correctly. (We round down instead of up, so -56 is the correct
1962 * value for our calculations instead of -55)
1963 */
1964 size_t j, extra_run = 0;
1965 extra_run = ( 13 + ssl->in_msglen + padlen + 8 ) / 64 -
1966 ( 13 + ssl->in_msglen + 8 ) / 64;
Paul Bakkere47b34b2013-02-27 14:48:00 +01001967
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001968 extra_run &= correct * 0xFF;
Paul Bakkere47b34b2013-02-27 14:48:00 +01001969
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001970 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_ctr, 8 );
1971 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_hdr, 3 );
1972 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_len, 2 );
1973 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_msg,
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001974 ssl->in_msglen );
Hanno Becker992b6872017-11-09 18:57:39 +00001975 mbedtls_md_hmac_finish( &ssl->transform_in->md_ctx_dec, mac_expect );
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02001976 /* Call mbedtls_md_process at least once due to cache attacks */
Manuel Pégourié-Gonnard47fede02015-04-29 01:35:48 +02001977 for( j = 0; j < extra_run + 1; j++ )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001978 mbedtls_md_process( &ssl->transform_in->md_ctx_dec, ssl->in_msg );
Paul Bakkere47b34b2013-02-27 14:48:00 +01001979
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001980 mbedtls_md_hmac_reset( &ssl->transform_in->md_ctx_dec );
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001981 }
1982 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001983#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
1984 MBEDTLS_SSL_PROTO_TLS1_2 */
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001985 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001986 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1987 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001988 }
Paul Bakker5121ce52009-01-03 21:22:43 +00001989
Hanno Becker992b6872017-11-09 18:57:39 +00001990 MBEDTLS_SSL_DEBUG_BUF( 4, "expected mac", mac_expect, ssl->transform_in->maclen );
1991 MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", ssl->in_msg + ssl->in_msglen,
1992 ssl->transform_in->maclen );
Paul Bakker5121ce52009-01-03 21:22:43 +00001993
Hanno Becker992b6872017-11-09 18:57:39 +00001994 if( mbedtls_ssl_safer_memcmp( ssl->in_msg + ssl->in_msglen, mac_expect,
1995 ssl->transform_in->maclen ) != 0 )
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001996 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001997#if defined(MBEDTLS_SSL_DEBUG_ALL)
1998 MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) );
Paul Bakkere47b34b2013-02-27 14:48:00 +01001999#endif
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02002000 correct = 0;
2001 }
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01002002 auth_done++;
Paul Bakker5121ce52009-01-03 21:22:43 +00002003
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02002004 /*
2005 * Finally check the correct flag
2006 */
2007 if( correct == 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002008 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02002009 }
Manuel Pégourié-Gonnard8408a942015-04-09 12:14:31 +02002010#endif /* SSL_SOME_MODES_USE_MAC */
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01002011
2012 /* Make extra sure authentication was performed, exactly once */
2013 if( auth_done != 1 )
2014 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002015 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2016 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01002017 }
Paul Bakker5121ce52009-01-03 21:22:43 +00002018
2019 if( ssl->in_msglen == 0 )
2020 {
2021 ssl->nb_zero++;
2022
2023 /*
2024 * Three or more empty messages may be a DoS attack
2025 * (excessive CPU consumption).
2026 */
2027 if( ssl->nb_zero > 3 )
2028 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002029 MBEDTLS_SSL_DEBUG_MSG( 1, ( "received four consecutive empty "
Paul Bakker5121ce52009-01-03 21:22:43 +00002030 "messages, possible DoS attack" ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002031 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Paul Bakker5121ce52009-01-03 21:22:43 +00002032 }
2033 }
2034 else
2035 ssl->nb_zero = 0;
Paul Bakkerf7abd422013-04-16 13:15:56 +02002036
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002037#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002038 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +01002039 {
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02002040 ; /* in_ctr read from peer, not maintained internally */
Manuel Pégourié-Gonnardea22ce52014-09-24 09:46:10 +02002041 }
2042 else
2043#endif
2044 {
2045 for( i = 8; i > ssl_ep_len( ssl ); i-- )
2046 if( ++ssl->in_ctr[i - 1] != 0 )
2047 break;
2048
2049 /* The loop goes to its end iff the counter is wrapping */
2050 if( i == ssl_ep_len( ssl ) )
2051 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002052 MBEDTLS_SSL_DEBUG_MSG( 1, ( "incoming message counter would wrap" ) );
2053 return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
Manuel Pégourié-Gonnardea22ce52014-09-24 09:46:10 +02002054 }
Manuel Pégourié-Gonnard83cdffc2014-03-10 21:20:29 +01002055 }
2056
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002057 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decrypt buf" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002058
2059 return( 0 );
2060}
2061
Manuel Pégourié-Gonnard0098e7d2014-10-28 13:08:59 +01002062#undef MAC_NONE
2063#undef MAC_PLAINTEXT
2064#undef MAC_CIPHERTEXT
2065
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002066#if defined(MBEDTLS_ZLIB_SUPPORT)
Paul Bakker2770fbd2012-07-03 13:30:23 +00002067/*
2068 * Compression/decompression functions
2069 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002070static int ssl_compress_buf( mbedtls_ssl_context *ssl )
Paul Bakker2770fbd2012-07-03 13:30:23 +00002071{
2072 int ret;
2073 unsigned char *msg_post = ssl->out_msg;
2074 size_t len_pre = ssl->out_msglen;
Paul Bakker16770332013-10-11 09:59:44 +02002075 unsigned char *msg_pre = ssl->compress_buf;
Paul Bakker2770fbd2012-07-03 13:30:23 +00002076
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002077 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> compress buf" ) );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002078
Paul Bakkerabf2f8f2013-06-30 14:57:46 +02002079 if( len_pre == 0 )
2080 return( 0 );
2081
Paul Bakker2770fbd2012-07-03 13:30:23 +00002082 memcpy( msg_pre, ssl->out_msg, len_pre );
2083
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002084 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before compression: msglen = %d, ",
Paul Bakker2770fbd2012-07-03 13:30:23 +00002085 ssl->out_msglen ) );
2086
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002087 MBEDTLS_SSL_DEBUG_BUF( 4, "before compression: output payload",
Paul Bakker2770fbd2012-07-03 13:30:23 +00002088 ssl->out_msg, ssl->out_msglen );
2089
Paul Bakker48916f92012-09-16 19:57:18 +00002090 ssl->transform_out->ctx_deflate.next_in = msg_pre;
2091 ssl->transform_out->ctx_deflate.avail_in = len_pre;
2092 ssl->transform_out->ctx_deflate.next_out = msg_post;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002093 ssl->transform_out->ctx_deflate.avail_out = MBEDTLS_SSL_BUFFER_LEN;
Paul Bakker2770fbd2012-07-03 13:30:23 +00002094
Paul Bakker48916f92012-09-16 19:57:18 +00002095 ret = deflate( &ssl->transform_out->ctx_deflate, Z_SYNC_FLUSH );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002096 if( ret != Z_OK )
2097 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002098 MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform compression (%d)", ret ) );
2099 return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002100 }
2101
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002102 ssl->out_msglen = MBEDTLS_SSL_BUFFER_LEN -
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +02002103 ssl->transform_out->ctx_deflate.avail_out;
Paul Bakker2770fbd2012-07-03 13:30:23 +00002104
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002105 MBEDTLS_SSL_DEBUG_MSG( 3, ( "after compression: msglen = %d, ",
Paul Bakker2770fbd2012-07-03 13:30:23 +00002106 ssl->out_msglen ) );
2107
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002108 MBEDTLS_SSL_DEBUG_BUF( 4, "after compression: output payload",
Paul Bakker2770fbd2012-07-03 13:30:23 +00002109 ssl->out_msg, ssl->out_msglen );
2110
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002111 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= compress buf" ) );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002112
2113 return( 0 );
2114}
2115
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002116static int ssl_decompress_buf( mbedtls_ssl_context *ssl )
Paul Bakker2770fbd2012-07-03 13:30:23 +00002117{
2118 int ret;
2119 unsigned char *msg_post = ssl->in_msg;
2120 size_t len_pre = ssl->in_msglen;
Paul Bakker16770332013-10-11 09:59:44 +02002121 unsigned char *msg_pre = ssl->compress_buf;
Paul Bakker2770fbd2012-07-03 13:30:23 +00002122
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002123 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decompress buf" ) );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002124
Paul Bakkerabf2f8f2013-06-30 14:57:46 +02002125 if( len_pre == 0 )
2126 return( 0 );
2127
Paul Bakker2770fbd2012-07-03 13:30:23 +00002128 memcpy( msg_pre, ssl->in_msg, len_pre );
2129
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002130 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before decompression: msglen = %d, ",
Paul Bakker2770fbd2012-07-03 13:30:23 +00002131 ssl->in_msglen ) );
2132
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002133 MBEDTLS_SSL_DEBUG_BUF( 4, "before decompression: input payload",
Paul Bakker2770fbd2012-07-03 13:30:23 +00002134 ssl->in_msg, ssl->in_msglen );
2135
Paul Bakker48916f92012-09-16 19:57:18 +00002136 ssl->transform_in->ctx_inflate.next_in = msg_pre;
2137 ssl->transform_in->ctx_inflate.avail_in = len_pre;
2138 ssl->transform_in->ctx_inflate.next_out = msg_post;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002139 ssl->transform_in->ctx_inflate.avail_out = MBEDTLS_SSL_MAX_CONTENT_LEN;
Paul Bakker2770fbd2012-07-03 13:30:23 +00002140
Paul Bakker48916f92012-09-16 19:57:18 +00002141 ret = inflate( &ssl->transform_in->ctx_inflate, Z_SYNC_FLUSH );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002142 if( ret != Z_OK )
2143 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002144 MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform decompression (%d)", ret ) );
2145 return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002146 }
2147
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002148 ssl->in_msglen = MBEDTLS_SSL_MAX_CONTENT_LEN -
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +02002149 ssl->transform_in->ctx_inflate.avail_out;
Paul Bakker2770fbd2012-07-03 13:30:23 +00002150
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002151 MBEDTLS_SSL_DEBUG_MSG( 3, ( "after decompression: msglen = %d, ",
Paul Bakker2770fbd2012-07-03 13:30:23 +00002152 ssl->in_msglen ) );
2153
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002154 MBEDTLS_SSL_DEBUG_BUF( 4, "after decompression: input payload",
Paul Bakker2770fbd2012-07-03 13:30:23 +00002155 ssl->in_msg, ssl->in_msglen );
2156
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002157 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decompress buf" ) );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002158
2159 return( 0 );
2160}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002161#endif /* MBEDTLS_ZLIB_SUPPORT */
Paul Bakker2770fbd2012-07-03 13:30:23 +00002162
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002163#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
2164static int ssl_write_hello_request( mbedtls_ssl_context *ssl );
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02002165
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002166#if defined(MBEDTLS_SSL_PROTO_DTLS)
2167static int ssl_resend_hello_request( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02002168{
2169 /* If renegotiation is not enforced, retransmit until we would reach max
2170 * timeout if we were using the usual handshake doubling scheme */
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002171 if( ssl->conf->renego_max_records < 0 )
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02002172 {
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002173 uint32_t ratio = ssl->conf->hs_timeout_max / ssl->conf->hs_timeout_min + 1;
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02002174 unsigned char doublings = 1;
2175
2176 while( ratio != 0 )
2177 {
2178 ++doublings;
2179 ratio >>= 1;
2180 }
2181
2182 if( ++ssl->renego_records_seen > doublings )
2183 {
Manuel Pégourié-Gonnardcb0d2122015-07-22 11:52:11 +02002184 MBEDTLS_SSL_DEBUG_MSG( 2, ( "no longer retransmitting hello request" ) );
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02002185 return( 0 );
2186 }
2187 }
2188
2189 return( ssl_write_hello_request( ssl ) );
2190}
2191#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002192#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02002193
Paul Bakker5121ce52009-01-03 21:22:43 +00002194/*
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02002195 * Fill the input message buffer by appending data to it.
2196 * The amount of data already fetched is in ssl->in_left.
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002197 *
2198 * If we return 0, is it guaranteed that (at least) nb_want bytes are
2199 * available (from this read and/or a previous one). Otherwise, an error code
2200 * is returned (possibly EOF or WANT_READ).
2201 *
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02002202 * With stream transport (TLS) on success ssl->in_left == nb_want, but
2203 * with datagram transport (DTLS) on success ssl->in_left >= nb_want,
2204 * since we always read a whole datagram at once.
2205 *
Manuel Pégourié-Gonnard64dffc52014-09-02 13:39:16 +02002206 * For DTLS, it is up to the caller to set ssl->next_record_offset when
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02002207 * they're done reading a record.
Paul Bakker5121ce52009-01-03 21:22:43 +00002208 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002209int mbedtls_ssl_fetch_input( mbedtls_ssl_context *ssl, size_t nb_want )
Paul Bakker5121ce52009-01-03 21:22:43 +00002210{
Paul Bakker23986e52011-04-24 08:57:21 +00002211 int ret;
2212 size_t len;
Paul Bakker5121ce52009-01-03 21:22:43 +00002213
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002214 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> fetch input" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002215
Manuel Pégourié-Gonnarde6bdc442014-09-17 11:34:57 +02002216 if( ssl->f_recv == NULL && ssl->f_recv_timeout == NULL )
2217 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002218 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() "
Manuel Pégourié-Gonnard1b511f92015-05-06 15:54:23 +01002219 "or mbedtls_ssl_set_bio()" ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002220 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnarde6bdc442014-09-17 11:34:57 +02002221 }
2222
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002223 if( nb_want > MBEDTLS_SSL_BUFFER_LEN - (size_t)( ssl->in_hdr - ssl->in_buf ) )
Paul Bakker1a1fbba2014-04-30 14:38:05 +02002224 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002225 MBEDTLS_SSL_DEBUG_MSG( 1, ( "requesting more data than fits" ) );
2226 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Paul Bakker1a1fbba2014-04-30 14:38:05 +02002227 }
2228
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002229#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002230 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Paul Bakker5121ce52009-01-03 21:22:43 +00002231 {
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02002232 uint32_t timeout;
2233
Manuel Pégourié-Gonnard2e012912015-05-12 20:55:41 +02002234 /* Just to be sure */
2235 if( ssl->f_set_timer == NULL || ssl->f_get_timer == NULL )
2236 {
2237 MBEDTLS_SSL_DEBUG_MSG( 1, ( "You must use "
2238 "mbedtls_ssl_set_timer_cb() for DTLS" ) );
2239 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
2240 }
2241
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02002242 /*
2243 * The point is, we need to always read a full datagram at once, so we
2244 * sometimes read more then requested, and handle the additional data.
2245 * It could be the rest of the current record (while fetching the
2246 * header) and/or some other records in the same datagram.
2247 */
2248
2249 /*
2250 * Move to the next record in the already read datagram if applicable
2251 */
2252 if( ssl->next_record_offset != 0 )
2253 {
2254 if( ssl->in_left < ssl->next_record_offset )
2255 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002256 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2257 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02002258 }
2259
2260 ssl->in_left -= ssl->next_record_offset;
2261
2262 if( ssl->in_left != 0 )
2263 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002264 MBEDTLS_SSL_DEBUG_MSG( 2, ( "next record in same datagram, offset: %d",
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02002265 ssl->next_record_offset ) );
2266 memmove( ssl->in_hdr,
2267 ssl->in_hdr + ssl->next_record_offset,
2268 ssl->in_left );
2269 }
2270
2271 ssl->next_record_offset = 0;
2272 }
2273
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002274 MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
Paul Bakker5121ce52009-01-03 21:22:43 +00002275 ssl->in_left, nb_want ) );
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002276
2277 /*
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02002278 * Done if we already have enough data.
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002279 */
2280 if( nb_want <= ssl->in_left)
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002281 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002282 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) );
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002283 return( 0 );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002284 }
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002285
2286 /*
2287 * A record can't be split accross datagrams. If we need to read but
2288 * are not at the beginning of a new record, the caller did something
2289 * wrong.
2290 */
2291 if( ssl->in_left != 0 )
2292 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002293 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2294 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002295 }
2296
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002297 /*
2298 * Don't even try to read if time's out already.
2299 * This avoids by-passing the timer when repeatedly receiving messages
2300 * that will end up being dropped.
2301 */
2302 if( ssl_check_timer( ssl ) != 0 )
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01002303 ret = MBEDTLS_ERR_SSL_TIMEOUT;
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02002304 else
Manuel Pégourié-Gonnard6a2bdfa2014-09-19 21:18:23 +02002305 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002306 len = MBEDTLS_SSL_BUFFER_LEN - ( ssl->in_hdr - ssl->in_buf );
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002307
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002308 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002309 timeout = ssl->handshake->retransmit_timeout;
2310 else
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002311 timeout = ssl->conf->read_timeout;
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002312
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002313 MBEDTLS_SSL_DEBUG_MSG( 3, ( "f_recv_timeout: %u ms", timeout ) );
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002314
Manuel Pégourié-Gonnard07617332015-06-24 23:00:03 +02002315 if( ssl->f_recv_timeout != NULL )
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002316 ret = ssl->f_recv_timeout( ssl->p_bio, ssl->in_hdr, len,
2317 timeout );
2318 else
2319 ret = ssl->f_recv( ssl->p_bio, ssl->in_hdr, len );
2320
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002321 MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret );
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002322
2323 if( ret == 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002324 return( MBEDTLS_ERR_SSL_CONN_EOF );
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002325 }
2326
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01002327 if( ret == MBEDTLS_ERR_SSL_TIMEOUT )
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002328 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002329 MBEDTLS_SSL_DEBUG_MSG( 2, ( "timeout" ) );
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002330 ssl_set_timer( ssl, 0 );
Manuel Pégourié-Gonnard6a2bdfa2014-09-19 21:18:23 +02002331
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002332 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +02002333 {
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02002334 if( ssl_double_retransmit_timeout( ssl ) != 0 )
2335 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002336 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake timeout" ) );
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01002337 return( MBEDTLS_ERR_SSL_TIMEOUT );
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02002338 }
2339
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002340 if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02002341 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002342 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret );
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02002343 return( ret );
2344 }
2345
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01002346 return( MBEDTLS_ERR_SSL_WANT_READ );
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +02002347 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002348#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002349 else if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002350 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02002351 {
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02002352 if( ( ret = ssl_resend_hello_request( ssl ) ) != 0 )
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02002353 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002354 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_resend_hello_request", ret );
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02002355 return( ret );
2356 }
2357
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01002358 return( MBEDTLS_ERR_SSL_WANT_READ );
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02002359 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002360#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
Manuel Pégourié-Gonnard6a2bdfa2014-09-19 21:18:23 +02002361 }
2362
Paul Bakker5121ce52009-01-03 21:22:43 +00002363 if( ret < 0 )
2364 return( ret );
2365
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002366 ssl->in_left = ret;
2367 }
2368 else
2369#endif
2370 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002371 MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02002372 ssl->in_left, nb_want ) );
2373
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002374 while( ssl->in_left < nb_want )
2375 {
2376 len = nb_want - ssl->in_left;
Manuel Pégourié-Gonnard286a1362015-05-13 16:22:05 +02002377
2378 if( ssl_check_timer( ssl ) != 0 )
2379 ret = MBEDTLS_ERR_SSL_TIMEOUT;
2380 else
Manuel Pégourié-Gonnard07617332015-06-24 23:00:03 +02002381 {
2382 if( ssl->f_recv_timeout != NULL )
2383 {
2384 ret = ssl->f_recv_timeout( ssl->p_bio,
2385 ssl->in_hdr + ssl->in_left, len,
2386 ssl->conf->read_timeout );
2387 }
2388 else
2389 {
2390 ret = ssl->f_recv( ssl->p_bio,
2391 ssl->in_hdr + ssl->in_left, len );
2392 }
2393 }
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002394
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002395 MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
Manuel Pégourié-Gonnard07617332015-06-24 23:00:03 +02002396 ssl->in_left, nb_want ) );
2397 MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret );
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002398
2399 if( ret == 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002400 return( MBEDTLS_ERR_SSL_CONN_EOF );
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002401
2402 if( ret < 0 )
2403 return( ret );
2404
2405 ssl->in_left += ret;
2406 }
Paul Bakker5121ce52009-01-03 21:22:43 +00002407 }
2408
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002409 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002410
2411 return( 0 );
2412}
2413
2414/*
2415 * Flush any data not yet written
2416 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002417int mbedtls_ssl_flush_output( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00002418{
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +01002419 int ret;
2420 unsigned char *buf, i;
Paul Bakker5121ce52009-01-03 21:22:43 +00002421
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002422 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> flush output" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002423
Manuel Pégourié-Gonnarde6bdc442014-09-17 11:34:57 +02002424 if( ssl->f_send == NULL )
2425 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002426 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() "
Manuel Pégourié-Gonnard1b511f92015-05-06 15:54:23 +01002427 "or mbedtls_ssl_set_bio()" ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002428 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnarde6bdc442014-09-17 11:34:57 +02002429 }
2430
Manuel Pégourié-Gonnard06193482014-02-14 08:39:32 +01002431 /* Avoid incrementing counter if data is flushed */
2432 if( ssl->out_left == 0 )
2433 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002434 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) );
Manuel Pégourié-Gonnard06193482014-02-14 08:39:32 +01002435 return( 0 );
2436 }
2437
Paul Bakker5121ce52009-01-03 21:22:43 +00002438 while( ssl->out_left > 0 )
2439 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002440 MBEDTLS_SSL_DEBUG_MSG( 2, ( "message length: %d, out_left: %d",
2441 mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen, ssl->out_left ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002442
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002443 buf = ssl->out_hdr + mbedtls_ssl_hdr_len( ssl ) +
Manuel Pégourié-Gonnard06193482014-02-14 08:39:32 +01002444 ssl->out_msglen - ssl->out_left;
Manuel Pégourié-Gonnarde6bdc442014-09-17 11:34:57 +02002445 ret = ssl->f_send( ssl->p_bio, buf, ssl->out_left );
Paul Bakker186751d2012-05-08 13:16:14 +00002446
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002447 MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_send", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00002448
2449 if( ret <= 0 )
2450 return( ret );
2451
2452 ssl->out_left -= ret;
2453 }
2454
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +01002455 for( i = 8; i > ssl_ep_len( ssl ); i-- )
Manuel Pégourié-Gonnard06193482014-02-14 08:39:32 +01002456 if( ++ssl->out_ctr[i - 1] != 0 )
2457 break;
2458
2459 /* The loop goes to its end iff the counter is wrapping */
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +01002460 if( i == ssl_ep_len( ssl ) )
Manuel Pégourié-Gonnard06193482014-02-14 08:39:32 +01002461 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002462 MBEDTLS_SSL_DEBUG_MSG( 1, ( "outgoing message counter would wrap" ) );
2463 return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
Manuel Pégourié-Gonnard06193482014-02-14 08:39:32 +01002464 }
2465
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002466 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002467
2468 return( 0 );
2469}
2470
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002471/*
2472 * Functions to handle the DTLS retransmission state machine
2473 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002474#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002475/*
2476 * Append current handshake message to current outgoing flight
2477 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002478static int ssl_flight_append( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002479{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002480 mbedtls_ssl_flight_item *msg;
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002481
2482 /* Allocate space for current message */
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02002483 if( ( msg = mbedtls_calloc( 1, sizeof( mbedtls_ssl_flight_item ) ) ) == NULL )
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002484 {
Manuel Pégourié-Gonnardb2a18a22015-05-27 16:29:56 +02002485 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed",
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002486 sizeof( mbedtls_ssl_flight_item ) ) );
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02002487 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002488 }
2489
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02002490 if( ( msg->p = mbedtls_calloc( 1, ssl->out_msglen ) ) == NULL )
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002491 {
Manuel Pégourié-Gonnardb2a18a22015-05-27 16:29:56 +02002492 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed", ssl->out_msglen ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002493 mbedtls_free( msg );
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02002494 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002495 }
2496
2497 /* Copy current handshake message with headers */
2498 memcpy( msg->p, ssl->out_msg, ssl->out_msglen );
2499 msg->len = ssl->out_msglen;
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002500 msg->type = ssl->out_msgtype;
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002501 msg->next = NULL;
2502
2503 /* Append to the current flight */
2504 if( ssl->handshake->flight == NULL )
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002505 ssl->handshake->flight = msg;
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002506 else
2507 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002508 mbedtls_ssl_flight_item *cur = ssl->handshake->flight;
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002509 while( cur->next != NULL )
2510 cur = cur->next;
2511 cur->next = msg;
2512 }
2513
2514 return( 0 );
2515}
2516
2517/*
2518 * Free the current flight of handshake messages
2519 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002520static void ssl_flight_free( mbedtls_ssl_flight_item *flight )
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002521{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002522 mbedtls_ssl_flight_item *cur = flight;
2523 mbedtls_ssl_flight_item *next;
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002524
2525 while( cur != NULL )
2526 {
2527 next = cur->next;
2528
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002529 mbedtls_free( cur->p );
2530 mbedtls_free( cur );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002531
2532 cur = next;
2533 }
2534}
2535
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002536#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
2537static void ssl_dtls_replay_reset( mbedtls_ssl_context *ssl );
Manuel Pégourié-Gonnardb47368a2014-09-24 13:29:58 +02002538#endif
2539
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002540/*
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002541 * Swap transform_out and out_ctr with the alternative ones
2542 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002543static void ssl_swap_epochs( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002544{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002545 mbedtls_ssl_transform *tmp_transform;
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002546 unsigned char tmp_out_ctr[8];
2547
2548 if( ssl->transform_out == ssl->handshake->alt_transform_out )
2549 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002550 MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip swap epochs" ) );
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002551 return;
2552 }
2553
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002554 MBEDTLS_SSL_DEBUG_MSG( 3, ( "swap epochs" ) );
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002555
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002556 /* Swap transforms */
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002557 tmp_transform = ssl->transform_out;
2558 ssl->transform_out = ssl->handshake->alt_transform_out;
2559 ssl->handshake->alt_transform_out = tmp_transform;
2560
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002561 /* Swap epoch + sequence_number */
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002562 memcpy( tmp_out_ctr, ssl->out_ctr, 8 );
2563 memcpy( ssl->out_ctr, ssl->handshake->alt_out_ctr, 8 );
2564 memcpy( ssl->handshake->alt_out_ctr, tmp_out_ctr, 8 );
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002565
2566 /* Adjust to the newly activated transform */
2567 if( ssl->transform_out != NULL &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002568 ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002569 {
2570 ssl->out_msg = ssl->out_iv + ssl->transform_out->ivlen -
2571 ssl->transform_out->fixed_ivlen;
2572 }
2573 else
2574 ssl->out_msg = ssl->out_iv;
2575
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002576#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
2577 if( mbedtls_ssl_hw_record_activate != NULL )
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002578 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002579 if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 )
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002580 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002581 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
2582 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002583 }
2584 }
2585#endif
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002586}
2587
2588/*
2589 * Retransmit the current flight of messages.
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002590 *
2591 * Need to remember the current message in case flush_output returns
2592 * WANT_WRITE, causing us to exit this function and come back later.
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002593 * This function must be called until state is no longer SENDING.
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002594 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002595int mbedtls_ssl_resend( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002596{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002597 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> mbedtls_ssl_resend" ) );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002598
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002599 if( ssl->handshake->retransmit_state != MBEDTLS_SSL_RETRANS_SENDING )
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002600 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002601 MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialise resending" ) );
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002602
2603 ssl->handshake->cur_msg = ssl->handshake->flight;
2604 ssl_swap_epochs( ssl );
2605
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002606 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_SENDING;
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002607 }
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002608
2609 while( ssl->handshake->cur_msg != NULL )
2610 {
2611 int ret;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002612 mbedtls_ssl_flight_item *cur = ssl->handshake->cur_msg;
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002613
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002614 /* Swap epochs before sending Finished: we can't do it after
2615 * sending ChangeCipherSpec, in case write returns WANT_READ.
2616 * Must be done before copying, may change out_msg pointer */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002617 if( cur->type == MBEDTLS_SSL_MSG_HANDSHAKE &&
2618 cur->p[0] == MBEDTLS_SSL_HS_FINISHED )
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002619 {
2620 ssl_swap_epochs( ssl );
2621 }
2622
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002623 memcpy( ssl->out_msg, cur->p, cur->len );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002624 ssl->out_msglen = cur->len;
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002625 ssl->out_msgtype = cur->type;
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002626
2627 ssl->handshake->cur_msg = cur->next;
2628
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002629 MBEDTLS_SSL_DEBUG_BUF( 3, "resent handshake message header", ssl->out_msg, 12 );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002630
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002631 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002632 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002633 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002634 return( ret );
2635 }
2636 }
2637
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002638 if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
2639 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
Manuel Pégourié-Gonnard23b7b702014-09-25 13:50:12 +02002640 else
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002641 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002642 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002643 ssl_set_timer( ssl, ssl->handshake->retransmit_timeout );
2644 }
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02002645
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002646 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= mbedtls_ssl_resend" ) );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002647
2648 return( 0 );
2649}
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002650
2651/*
2652 * To be called when the last message of an incoming flight is received.
2653 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002654void mbedtls_ssl_recv_flight_completed( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002655{
2656 /* We won't need to resend that one any more */
2657 ssl_flight_free( ssl->handshake->flight );
2658 ssl->handshake->flight = NULL;
2659 ssl->handshake->cur_msg = NULL;
2660
2661 /* The next incoming flight will start with this msg_seq */
2662 ssl->handshake->in_flight_start_seq = ssl->handshake->in_msg_seq;
2663
Manuel Pégourié-Gonnard6c1fa3a2014-10-01 16:58:16 +02002664 /* Cancel timer */
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02002665 ssl_set_timer( ssl, 0 );
2666
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002667 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
2668 ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED )
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002669 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002670 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002671 }
2672 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002673 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING;
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002674}
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02002675
2676/*
2677 * To be called when the last message of an outgoing flight is send.
2678 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002679void mbedtls_ssl_send_flight_completed( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02002680{
Manuel Pégourié-Gonnard6c1fa3a2014-10-01 16:58:16 +02002681 ssl_reset_retransmit_timeout( ssl );
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +02002682 ssl_set_timer( ssl, ssl->handshake->retransmit_timeout );
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02002683
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002684 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
2685 ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED )
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02002686 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002687 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02002688 }
2689 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002690 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02002691}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002692#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002693
Paul Bakker5121ce52009-01-03 21:22:43 +00002694/*
2695 * Record layer functions
2696 */
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002697
2698/*
2699 * Write current record.
2700 * Uses ssl->out_msgtype, ssl->out_msglen and bytes at ssl->out_msg.
2701 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002702int mbedtls_ssl_write_record( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00002703{
Nicholas Wilsonf0021642016-04-13 11:51:05 +01002704 int ret, done = 0, out_msg_type;
Paul Bakker23986e52011-04-24 08:57:21 +00002705 size_t len = ssl->out_msglen;
Paul Bakker5121ce52009-01-03 21:22:43 +00002706
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002707 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write record" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002708
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002709#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002710 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002711 ssl->handshake != NULL &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002712 ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002713 {
2714 ; /* Skip special handshake treatment when resending */
2715 }
2716 else
2717#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002718 if( ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
Paul Bakker5121ce52009-01-03 21:22:43 +00002719 {
Nicholas Wilsonf0021642016-04-13 11:51:05 +01002720 out_msg_type = ssl->out_msg[0];
2721
2722 if( out_msg_type != MBEDTLS_SSL_HS_HELLO_REQUEST &&
Manuel Pégourié-Gonnard14bf7062015-06-23 14:07:13 +02002723 ssl->handshake == NULL )
2724 {
2725 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2726 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
2727 }
2728
Paul Bakker5121ce52009-01-03 21:22:43 +00002729 ssl->out_msg[1] = (unsigned char)( ( len - 4 ) >> 16 );
2730 ssl->out_msg[2] = (unsigned char)( ( len - 4 ) >> 8 );
2731 ssl->out_msg[3] = (unsigned char)( ( len - 4 ) );
2732
Manuel Pégourié-Gonnardce441b32014-02-18 17:40:52 +01002733 /*
2734 * DTLS has additional fields in the Handshake layer,
2735 * between the length field and the actual payload:
2736 * uint16 message_seq;
2737 * uint24 fragment_offset;
2738 * uint24 fragment_length;
2739 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002740#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002741 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnardce441b32014-02-18 17:40:52 +01002742 {
Manuel Pégourié-Gonnarde89bcf02014-02-18 18:50:02 +01002743 /* Make room for the additional DTLS fields */
2744 memmove( ssl->out_msg + 12, ssl->out_msg + 4, len - 4 );
Manuel Pégourié-Gonnardce441b32014-02-18 17:40:52 +01002745 ssl->out_msglen += 8;
2746 len += 8;
2747
Manuel Pégourié-Gonnardc392b242014-08-19 17:53:11 +02002748 /* Write message_seq and update it, except for HelloRequest */
Nicholas Wilsonf0021642016-04-13 11:51:05 +01002749 if( out_msg_type != MBEDTLS_SSL_HS_HELLO_REQUEST )
Manuel Pégourié-Gonnardc392b242014-08-19 17:53:11 +02002750 {
Manuel Pégourié-Gonnardd9ba0d92014-09-02 18:30:26 +02002751 ssl->out_msg[4] = ( ssl->handshake->out_msg_seq >> 8 ) & 0xFF;
2752 ssl->out_msg[5] = ( ssl->handshake->out_msg_seq ) & 0xFF;
2753 ++( ssl->handshake->out_msg_seq );
Manuel Pégourié-Gonnardc392b242014-08-19 17:53:11 +02002754 }
2755 else
2756 {
2757 ssl->out_msg[4] = 0;
2758 ssl->out_msg[5] = 0;
2759 }
Manuel Pégourié-Gonnarde89bcf02014-02-18 18:50:02 +01002760
2761 /* We don't fragment, so frag_offset = 0 and frag_len = len */
2762 memset( ssl->out_msg + 6, 0x00, 3 );
2763 memcpy( ssl->out_msg + 9, ssl->out_msg + 1, 3 );
Manuel Pégourié-Gonnardce441b32014-02-18 17:40:52 +01002764 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002765#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnardce441b32014-02-18 17:40:52 +01002766
Nicholas Wilsonf0021642016-04-13 11:51:05 +01002767 if( out_msg_type != MBEDTLS_SSL_HS_HELLO_REQUEST )
Manuel Pégourié-Gonnardf3dc2f62013-10-29 18:17:41 +01002768 ssl->handshake->update_checksum( ssl, ssl->out_msg, len );
Paul Bakker5121ce52009-01-03 21:22:43 +00002769 }
2770
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002771 /* Save handshake and CCS messages for resending */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002772#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002773 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002774 ssl->handshake != NULL &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002775 ssl->handshake->retransmit_state != MBEDTLS_SSL_RETRANS_SENDING &&
2776 ( ssl->out_msgtype == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC ||
2777 ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE ) )
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002778 {
2779 if( ( ret = ssl_flight_append( ssl ) ) != 0 )
2780 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002781 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_flight_append", ret );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002782 return( ret );
2783 }
2784 }
2785#endif
2786
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002787#if defined(MBEDTLS_ZLIB_SUPPORT)
Paul Bakker48916f92012-09-16 19:57:18 +00002788 if( ssl->transform_out != NULL &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002789 ssl->session_out->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
Paul Bakker2770fbd2012-07-03 13:30:23 +00002790 {
2791 if( ( ret = ssl_compress_buf( ssl ) ) != 0 )
2792 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002793 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_compress_buf", ret );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002794 return( ret );
2795 }
2796
2797 len = ssl->out_msglen;
2798 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002799#endif /*MBEDTLS_ZLIB_SUPPORT */
Paul Bakker2770fbd2012-07-03 13:30:23 +00002800
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002801#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
2802 if( mbedtls_ssl_hw_record_write != NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00002803 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002804 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_write()" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002805
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002806 ret = mbedtls_ssl_hw_record_write( ssl );
2807 if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH )
Paul Bakker05ef8352012-05-08 09:17:57 +00002808 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002809 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_write", ret );
2810 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
Paul Bakker05ef8352012-05-08 09:17:57 +00002811 }
Paul Bakkerc7878112012-12-19 14:41:14 +01002812
2813 if( ret == 0 )
2814 done = 1;
Paul Bakker05ef8352012-05-08 09:17:57 +00002815 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002816#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
Paul Bakker05ef8352012-05-08 09:17:57 +00002817 if( !done )
2818 {
2819 ssl->out_hdr[0] = (unsigned char) ssl->out_msgtype;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002820 mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002821 ssl->conf->transport, ssl->out_hdr + 1 );
Manuel Pégourié-Gonnard507e1e42014-02-13 11:17:34 +01002822
2823 ssl->out_len[0] = (unsigned char)( len >> 8 );
2824 ssl->out_len[1] = (unsigned char)( len );
Paul Bakker05ef8352012-05-08 09:17:57 +00002825
Paul Bakker48916f92012-09-16 19:57:18 +00002826 if( ssl->transform_out != NULL )
Paul Bakker05ef8352012-05-08 09:17:57 +00002827 {
2828 if( ( ret = ssl_encrypt_buf( ssl ) ) != 0 )
2829 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002830 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_encrypt_buf", ret );
Paul Bakker05ef8352012-05-08 09:17:57 +00002831 return( ret );
2832 }
2833
2834 len = ssl->out_msglen;
Manuel Pégourié-Gonnard507e1e42014-02-13 11:17:34 +01002835 ssl->out_len[0] = (unsigned char)( len >> 8 );
2836 ssl->out_len[1] = (unsigned char)( len );
Paul Bakker05ef8352012-05-08 09:17:57 +00002837 }
2838
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002839 ssl->out_left = mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen;
Paul Bakker05ef8352012-05-08 09:17:57 +00002840
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002841 MBEDTLS_SSL_DEBUG_MSG( 3, ( "output record: msgtype = %d, "
Paul Bakker05ef8352012-05-08 09:17:57 +00002842 "version = [%d:%d], msglen = %d",
2843 ssl->out_hdr[0], ssl->out_hdr[1], ssl->out_hdr[2],
Manuel Pégourié-Gonnard507e1e42014-02-13 11:17:34 +01002844 ( ssl->out_len[0] << 8 ) | ssl->out_len[1] ) );
Paul Bakker05ef8352012-05-08 09:17:57 +00002845
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002846 MBEDTLS_SSL_DEBUG_BUF( 4, "output record sent to network",
2847 ssl->out_hdr, mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen );
Paul Bakker5121ce52009-01-03 21:22:43 +00002848 }
2849
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002850 if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00002851 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002852 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00002853 return( ret );
2854 }
2855
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002856 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write record" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002857
2858 return( 0 );
2859}
2860
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002861#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002862/*
2863 * Mark bits in bitmask (used for DTLS HS reassembly)
2864 */
2865static void ssl_bitmask_set( unsigned char *mask, size_t offset, size_t len )
2866{
2867 unsigned int start_bits, end_bits;
2868
2869 start_bits = 8 - ( offset % 8 );
2870 if( start_bits != 8 )
2871 {
2872 size_t first_byte_idx = offset / 8;
2873
Manuel Pégourié-Gonnardac030522014-09-02 14:23:40 +02002874 /* Special case */
2875 if( len <= start_bits )
2876 {
2877 for( ; len != 0; len-- )
2878 mask[first_byte_idx] |= 1 << ( start_bits - len );
2879
2880 /* Avoid potential issues with offset or len becoming invalid */
2881 return;
2882 }
2883
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002884 offset += start_bits; /* Now offset % 8 == 0 */
2885 len -= start_bits;
2886
2887 for( ; start_bits != 0; start_bits-- )
2888 mask[first_byte_idx] |= 1 << ( start_bits - 1 );
2889 }
2890
2891 end_bits = len % 8;
2892 if( end_bits != 0 )
2893 {
2894 size_t last_byte_idx = ( offset + len ) / 8;
2895
2896 len -= end_bits; /* Now len % 8 == 0 */
2897
2898 for( ; end_bits != 0; end_bits-- )
2899 mask[last_byte_idx] |= 1 << ( 8 - end_bits );
2900 }
2901
2902 memset( mask + offset / 8, 0xFF, len / 8 );
2903}
2904
2905/*
2906 * Check that bitmask is full
2907 */
2908static int ssl_bitmask_check( unsigned char *mask, size_t len )
2909{
2910 size_t i;
2911
2912 for( i = 0; i < len / 8; i++ )
2913 if( mask[i] != 0xFF )
2914 return( -1 );
2915
2916 for( i = 0; i < len % 8; i++ )
2917 if( ( mask[len / 8] & ( 1 << ( 7 - i ) ) ) == 0 )
2918 return( -1 );
2919
2920 return( 0 );
2921}
2922
2923/*
2924 * Reassemble fragmented DTLS handshake messages.
2925 *
2926 * Use a temporary buffer for reassembly, divided in two parts:
2927 * - the first holds the reassembled message (including handshake header),
2928 * - the second holds a bitmask indicating which parts of the message
2929 * (excluding headers) have been received so far.
2930 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002931static int ssl_reassemble_dtls_handshake( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02002932{
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002933 unsigned char *msg, *bitmask;
2934 size_t frag_len, frag_off;
2935 size_t msg_len = ssl->in_hslen - 12; /* Without headers */
2936
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02002937 if( ssl->handshake == NULL )
2938 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002939 MBEDTLS_SSL_DEBUG_MSG( 1, ( "not supported outside handshake (for now)" ) );
2940 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02002941 }
2942
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002943 /*
2944 * For first fragment, check size and allocate buffer
2945 */
2946 if( ssl->handshake->hs_msg == NULL )
2947 {
2948 size_t alloc_len;
2949
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002950 MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialize reassembly, total length = %d",
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002951 msg_len ) );
2952
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002953 if( ssl->in_hslen > MBEDTLS_SSL_MAX_CONTENT_LEN )
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002954 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002955 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake message too large" ) );
2956 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002957 }
2958
2959 /* The bitmask needs one bit per byte of message excluding header */
2960 alloc_len = 12 + msg_len + msg_len / 8 + ( msg_len % 8 != 0 );
2961
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02002962 ssl->handshake->hs_msg = mbedtls_calloc( 1, alloc_len );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002963 if( ssl->handshake->hs_msg == NULL )
2964 {
Manuel Pégourié-Gonnardb2a18a22015-05-27 16:29:56 +02002965 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc failed (%d bytes)", alloc_len ) );
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02002966 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002967 }
2968
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002969 /* Prepare final header: copy msg_type, length and message_seq,
2970 * then add standardised fragment_offset and fragment_length */
2971 memcpy( ssl->handshake->hs_msg, ssl->in_msg, 6 );
2972 memset( ssl->handshake->hs_msg + 6, 0, 3 );
2973 memcpy( ssl->handshake->hs_msg + 9,
2974 ssl->handshake->hs_msg + 1, 3 );
2975 }
2976 else
2977 {
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02002978 /* Make sure msg_type and length are consistent */
2979 if( memcmp( ssl->handshake->hs_msg, ssl->in_msg, 4 ) != 0 )
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002980 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002981 MBEDTLS_SSL_DEBUG_MSG( 1, ( "fragment header mismatch" ) );
2982 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002983 }
2984 }
2985
2986 msg = ssl->handshake->hs_msg + 12;
2987 bitmask = msg + msg_len;
2988
2989 /*
2990 * Check and copy current fragment
2991 */
2992 frag_off = ( ssl->in_msg[6] << 16 ) |
2993 ( ssl->in_msg[7] << 8 ) |
2994 ssl->in_msg[8];
2995 frag_len = ( ssl->in_msg[9] << 16 ) |
2996 ( ssl->in_msg[10] << 8 ) |
2997 ssl->in_msg[11];
2998
2999 if( frag_off + frag_len > msg_len )
3000 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003001 MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid fragment offset/len: %d + %d > %d",
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003002 frag_off, frag_len, msg_len ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003003 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003004 }
3005
3006 if( frag_len + 12 > ssl->in_msglen )
3007 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003008 MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid fragment length: %d + 12 > %d",
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003009 frag_len, ssl->in_msglen ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003010 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003011 }
3012
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003013 MBEDTLS_SSL_DEBUG_MSG( 2, ( "adding fragment, offset = %d, length = %d",
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003014 frag_off, frag_len ) );
3015
3016 memcpy( msg + frag_off, ssl->in_msg + 12, frag_len );
3017 ssl_bitmask_set( bitmask, frag_off, frag_len );
3018
3019 /*
3020 * Do we have the complete message by now?
3021 * If yes, finalize it, else ask to read the next record.
3022 */
3023 if( ssl_bitmask_check( bitmask, msg_len ) != 0 )
3024 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003025 MBEDTLS_SSL_DEBUG_MSG( 2, ( "message is not complete yet" ) );
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01003026 return( MBEDTLS_ERR_SSL_WANT_READ );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003027 }
3028
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003029 MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake message completed" ) );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003030
Manuel Pégourié-Gonnard23cad332014-10-13 17:06:41 +02003031 if( frag_len + 12 < ssl->in_msglen )
3032 {
3033 /*
3034 * We'got more handshake messages in the same record.
3035 * This case is not handled now because no know implementation does
3036 * that and it's hard to test, so we prefer to fail cleanly for now.
3037 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003038 MBEDTLS_SSL_DEBUG_MSG( 1, ( "last fragment not alone in its record" ) );
3039 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
Manuel Pégourié-Gonnard23cad332014-10-13 17:06:41 +02003040 }
3041
Manuel Pégourié-Gonnard64dffc52014-09-02 13:39:16 +02003042 if( ssl->in_left > ssl->next_record_offset )
3043 {
3044 /*
3045 * We've got more data in the buffer after the current record,
3046 * that we don't want to overwrite. Move it before writing the
3047 * reassembled message, and adjust in_left and next_record_offset.
3048 */
3049 unsigned char *cur_remain = ssl->in_hdr + ssl->next_record_offset;
3050 unsigned char *new_remain = ssl->in_msg + ssl->in_hslen;
3051 size_t remain_len = ssl->in_left - ssl->next_record_offset;
3052
3053 /* First compute and check new lengths */
3054 ssl->next_record_offset = new_remain - ssl->in_hdr;
3055 ssl->in_left = ssl->next_record_offset + remain_len;
3056
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003057 if( ssl->in_left > MBEDTLS_SSL_BUFFER_LEN -
Manuel Pégourié-Gonnard64dffc52014-09-02 13:39:16 +02003058 (size_t)( ssl->in_hdr - ssl->in_buf ) )
3059 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003060 MBEDTLS_SSL_DEBUG_MSG( 1, ( "reassembled message too large for buffer" ) );
3061 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
Manuel Pégourié-Gonnard64dffc52014-09-02 13:39:16 +02003062 }
3063
3064 memmove( new_remain, cur_remain, remain_len );
3065 }
3066
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003067 memcpy( ssl->in_msg, ssl->handshake->hs_msg, ssl->in_hslen );
3068
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003069 mbedtls_free( ssl->handshake->hs_msg );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003070 ssl->handshake->hs_msg = NULL;
3071
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003072 MBEDTLS_SSL_DEBUG_BUF( 3, "reassembled handshake message",
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003073 ssl->in_msg, ssl->in_hslen );
3074
3075 return( 0 );
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003076}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003077#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003078
Simon Butcher99000142016-10-13 17:21:01 +01003079int mbedtls_ssl_prepare_handshake_record( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003080{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003081 if( ssl->in_msglen < mbedtls_ssl_hs_hdr_len( ssl ) )
Manuel Pégourié-Gonnard9d1d7192014-09-03 11:01:14 +02003082 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003083 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake message too short: %d",
Manuel Pégourié-Gonnard9d1d7192014-09-03 11:01:14 +02003084 ssl->in_msglen ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003085 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Manuel Pégourié-Gonnard9d1d7192014-09-03 11:01:14 +02003086 }
3087
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003088 ssl->in_hslen = mbedtls_ssl_hs_hdr_len( ssl ) + (
Manuel Pégourié-Gonnard9d1d7192014-09-03 11:01:14 +02003089 ( ssl->in_msg[1] << 16 ) |
3090 ( ssl->in_msg[2] << 8 ) |
3091 ssl->in_msg[3] );
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003092
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003093 MBEDTLS_SSL_DEBUG_MSG( 3, ( "handshake message: msglen ="
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003094 " %d, type = %d, hslen = %d",
Manuel Pégourié-Gonnardce441b32014-02-18 17:40:52 +01003095 ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) );
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003096
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003097#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003098 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003099 {
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003100 int ret;
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02003101 unsigned int recv_msg_seq = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5];
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003102
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02003103 /* ssl->handshake is NULL when receiving ClientHello for renego */
3104 if( ssl->handshake != NULL &&
3105 recv_msg_seq != ssl->handshake->in_msg_seq )
3106 {
Manuel Pégourié-Gonnardfc572dd2014-10-09 17:56:57 +02003107 /* Retransmit only on last message from previous flight, to avoid
3108 * too many retransmissions.
3109 * Besides, No sane server ever retransmits HelloVerifyRequest */
3110 if( recv_msg_seq == ssl->handshake->in_flight_start_seq - 1 &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003111 ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST )
Manuel Pégourié-Gonnard6a2bdfa2014-09-19 21:18:23 +02003112 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003113 MBEDTLS_SSL_DEBUG_MSG( 2, ( "received message from last flight, "
Manuel Pégourié-Gonnard6a2bdfa2014-09-19 21:18:23 +02003114 "message_seq = %d, start_of_flight = %d",
3115 recv_msg_seq,
3116 ssl->handshake->in_flight_start_seq ) );
3117
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003118 if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
Manuel Pégourié-Gonnard6a2bdfa2014-09-19 21:18:23 +02003119 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003120 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret );
Manuel Pégourié-Gonnard6a2bdfa2014-09-19 21:18:23 +02003121 return( ret );
3122 }
3123 }
3124 else
3125 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003126 MBEDTLS_SSL_DEBUG_MSG( 2, ( "dropping out-of-sequence message: "
Manuel Pégourié-Gonnard6a2bdfa2014-09-19 21:18:23 +02003127 "message_seq = %d, expected = %d",
3128 recv_msg_seq,
3129 ssl->handshake->in_msg_seq ) );
3130 }
3131
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01003132 return( MBEDTLS_ERR_SSL_WANT_READ );
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02003133 }
3134 /* Wait until message completion to increment in_msg_seq */
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003135
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003136 /* Reassemble if current message is fragmented or reassembly is
3137 * already in progress */
3138 if( ssl->in_msglen < ssl->in_hslen ||
3139 memcmp( ssl->in_msg + 6, "\0\0\0", 3 ) != 0 ||
3140 memcmp( ssl->in_msg + 9, ssl->in_msg + 1, 3 ) != 0 ||
3141 ( ssl->handshake != NULL && ssl->handshake->hs_msg != NULL ) )
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003142 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003143 MBEDTLS_SSL_DEBUG_MSG( 2, ( "found fragmented DTLS handshake message" ) );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003144
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003145 if( ( ret = ssl_reassemble_dtls_handshake( ssl ) ) != 0 )
3146 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003147 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_reassemble_dtls_handshake", ret );
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003148 return( ret );
3149 }
3150 }
3151 }
3152 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003153#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003154 /* With TLS we don't handle fragmentation (for now) */
3155 if( ssl->in_msglen < ssl->in_hslen )
3156 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003157 MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLS handshake fragmentation not supported" ) );
3158 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003159 }
3160
Simon Butcher99000142016-10-13 17:21:01 +01003161 return( 0 );
3162}
3163
3164void mbedtls_ssl_update_handshake_status( mbedtls_ssl_context *ssl )
3165{
3166
Manuel Pégourié-Gonnard14bf7062015-06-23 14:07:13 +02003167 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER &&
3168 ssl->handshake != NULL )
3169 {
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003170 ssl->handshake->update_checksum( ssl, ssl->in_msg, ssl->in_hslen );
Manuel Pégourié-Gonnard14bf7062015-06-23 14:07:13 +02003171 }
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003172
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02003173 /* Handshake message is complete, increment counter */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003174#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003175 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02003176 ssl->handshake != NULL )
3177 {
3178 ssl->handshake->in_msg_seq++;
3179 }
3180#endif
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003181}
3182
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003183/*
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003184 * DTLS anti-replay: RFC 6347 4.1.2.6
3185 *
Manuel Pégourié-Gonnard4956fd72014-09-24 11:13:44 +02003186 * in_window is a field of bits numbered from 0 (lsb) to 63 (msb).
3187 * Bit n is set iff record number in_window_top - n has been seen.
3188 *
3189 * Usually, in_window_top is the last record number seen and the lsb of
3190 * in_window is set. The only exception is the initial state (record number 0
3191 * not seen yet).
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003192 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003193#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
3194static void ssl_dtls_replay_reset( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003195{
3196 ssl->in_window_top = 0;
3197 ssl->in_window = 0;
3198}
3199
3200static inline uint64_t ssl_load_six_bytes( unsigned char *buf )
3201{
3202 return( ( (uint64_t) buf[0] << 40 ) |
3203 ( (uint64_t) buf[1] << 32 ) |
3204 ( (uint64_t) buf[2] << 24 ) |
3205 ( (uint64_t) buf[3] << 16 ) |
3206 ( (uint64_t) buf[4] << 8 ) |
3207 ( (uint64_t) buf[5] ) );
3208}
3209
3210/*
3211 * Return 0 if sequence number is acceptable, -1 otherwise
3212 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003213int mbedtls_ssl_dtls_replay_check( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003214{
3215 uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 );
3216 uint64_t bit;
3217
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003218 if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED )
Manuel Pégourié-Gonnard27393132014-09-24 14:41:11 +02003219 return( 0 );
3220
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003221 if( rec_seqnum > ssl->in_window_top )
3222 return( 0 );
3223
Manuel Pégourié-Gonnard4956fd72014-09-24 11:13:44 +02003224 bit = ssl->in_window_top - rec_seqnum;
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003225
3226 if( bit >= 64 )
3227 return( -1 );
3228
3229 if( ( ssl->in_window & ( (uint64_t) 1 << bit ) ) != 0 )
3230 return( -1 );
3231
3232 return( 0 );
3233}
3234
3235/*
3236 * Update replay window on new validated record
3237 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003238void mbedtls_ssl_dtls_replay_update( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003239{
3240 uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 );
3241
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003242 if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED )
Manuel Pégourié-Gonnard27393132014-09-24 14:41:11 +02003243 return;
3244
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003245 if( rec_seqnum > ssl->in_window_top )
3246 {
3247 /* Update window_top and the contents of the window */
3248 uint64_t shift = rec_seqnum - ssl->in_window_top;
3249
3250 if( shift >= 64 )
Manuel Pégourié-Gonnard4956fd72014-09-24 11:13:44 +02003251 ssl->in_window = 1;
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003252 else
Manuel Pégourié-Gonnard4956fd72014-09-24 11:13:44 +02003253 {
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003254 ssl->in_window <<= shift;
Manuel Pégourié-Gonnard4956fd72014-09-24 11:13:44 +02003255 ssl->in_window |= 1;
3256 }
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003257
3258 ssl->in_window_top = rec_seqnum;
3259 }
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003260 else
3261 {
3262 /* Mark that number as seen in the current window */
Manuel Pégourié-Gonnard4956fd72014-09-24 11:13:44 +02003263 uint64_t bit = ssl->in_window_top - rec_seqnum;
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003264
3265 if( bit < 64 ) /* Always true, but be extra sure */
3266 ssl->in_window |= (uint64_t) 1 << bit;
3267 }
3268}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003269#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003270
Manuel Pégourié-Gonnardddfe5d22015-09-09 12:46:16 +02003271#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003272/* Forward declaration */
Manuel Pégourié-Gonnard3f09b6d2015-09-08 11:58:14 +02003273static int ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial );
3274
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003275/*
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003276 * Without any SSL context, check if a datagram looks like a ClientHello with
3277 * a valid cookie, and if it doesn't, generate a HelloVerifyRequest message.
Simon Butcher0789aed2015-09-11 17:15:17 +01003278 * Both input and output include full DTLS headers.
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003279 *
3280 * - if cookie is valid, return 0
3281 * - if ClientHello looks superficially valid but cookie is not,
3282 * fill obuf and set olen, then
3283 * return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED
3284 * - otherwise return a specific error code
3285 */
3286static int ssl_check_dtls_clihlo_cookie(
3287 mbedtls_ssl_cookie_write_t *f_cookie_write,
3288 mbedtls_ssl_cookie_check_t *f_cookie_check,
3289 void *p_cookie,
3290 const unsigned char *cli_id, size_t cli_id_len,
3291 const unsigned char *in, size_t in_len,
3292 unsigned char *obuf, size_t buf_len, size_t *olen )
3293{
3294 size_t sid_len, cookie_len;
3295 unsigned char *p;
3296
3297 if( f_cookie_write == NULL || f_cookie_check == NULL )
3298 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
3299
3300 /*
3301 * Structure of ClientHello with record and handshake headers,
3302 * and expected values. We don't need to check a lot, more checks will be
3303 * done when actually parsing the ClientHello - skipping those checks
3304 * avoids code duplication and does not make cookie forging any easier.
3305 *
3306 * 0-0 ContentType type; copied, must be handshake
3307 * 1-2 ProtocolVersion version; copied
3308 * 3-4 uint16 epoch; copied, must be 0
3309 * 5-10 uint48 sequence_number; copied
3310 * 11-12 uint16 length; (ignored)
3311 *
3312 * 13-13 HandshakeType msg_type; (ignored)
3313 * 14-16 uint24 length; (ignored)
3314 * 17-18 uint16 message_seq; copied
3315 * 19-21 uint24 fragment_offset; copied, must be 0
3316 * 22-24 uint24 fragment_length; (ignored)
3317 *
3318 * 25-26 ProtocolVersion client_version; (ignored)
3319 * 27-58 Random random; (ignored)
3320 * 59-xx SessionID session_id; 1 byte len + sid_len content
3321 * 60+ opaque cookie<0..2^8-1>; 1 byte len + content
3322 * ...
3323 *
3324 * Minimum length is 61 bytes.
3325 */
3326 if( in_len < 61 ||
3327 in[0] != MBEDTLS_SSL_MSG_HANDSHAKE ||
3328 in[3] != 0 || in[4] != 0 ||
3329 in[19] != 0 || in[20] != 0 || in[21] != 0 )
3330 {
3331 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
3332 }
3333
3334 sid_len = in[59];
3335 if( sid_len > in_len - 61 )
3336 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
3337
3338 cookie_len = in[60 + sid_len];
3339 if( cookie_len > in_len - 60 )
3340 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
3341
3342 if( f_cookie_check( p_cookie, in + sid_len + 61, cookie_len,
3343 cli_id, cli_id_len ) == 0 )
3344 {
3345 /* Valid cookie */
3346 return( 0 );
3347 }
3348
3349 /*
3350 * If we get here, we've got an invalid cookie, let's prepare HVR.
3351 *
3352 * 0-0 ContentType type; copied
3353 * 1-2 ProtocolVersion version; copied
3354 * 3-4 uint16 epoch; copied
3355 * 5-10 uint48 sequence_number; copied
3356 * 11-12 uint16 length; olen - 13
3357 *
3358 * 13-13 HandshakeType msg_type; hello_verify_request
3359 * 14-16 uint24 length; olen - 25
3360 * 17-18 uint16 message_seq; copied
3361 * 19-21 uint24 fragment_offset; copied
3362 * 22-24 uint24 fragment_length; olen - 25
3363 *
3364 * 25-26 ProtocolVersion server_version; 0xfe 0xff
3365 * 27-27 opaque cookie<0..2^8-1>; cookie_len = olen - 27, cookie
3366 *
3367 * Minimum length is 28.
3368 */
3369 if( buf_len < 28 )
3370 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
3371
3372 /* Copy most fields and adapt others */
3373 memcpy( obuf, in, 25 );
3374 obuf[13] = MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST;
3375 obuf[25] = 0xfe;
3376 obuf[26] = 0xff;
3377
3378 /* Generate and write actual cookie */
3379 p = obuf + 28;
3380 if( f_cookie_write( p_cookie,
3381 &p, obuf + buf_len, cli_id, cli_id_len ) != 0 )
3382 {
3383 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
3384 }
3385
3386 *olen = p - obuf;
3387
3388 /* Go back and fill length fields */
3389 obuf[27] = (unsigned char)( *olen - 28 );
3390
3391 obuf[14] = obuf[22] = (unsigned char)( ( *olen - 25 ) >> 16 );
3392 obuf[15] = obuf[23] = (unsigned char)( ( *olen - 25 ) >> 8 );
3393 obuf[16] = obuf[24] = (unsigned char)( ( *olen - 25 ) );
3394
3395 obuf[11] = (unsigned char)( ( *olen - 13 ) >> 8 );
3396 obuf[12] = (unsigned char)( ( *olen - 13 ) );
3397
3398 return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED );
3399}
3400
3401/*
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003402 * Handle possible client reconnect with the same UDP quadruplet
3403 * (RFC 6347 Section 4.2.8).
3404 *
3405 * Called by ssl_parse_record_header() in case we receive an epoch 0 record
3406 * that looks like a ClientHello.
3407 *
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003408 * - if the input looks like a ClientHello without cookies,
3409 * send back HelloVerifyRequest, then
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003410 * return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003411 * - if the input looks like a ClientHello with a valid cookie,
3412 * reset the session of the current context, and
Manuel Pégourié-Gonnardbe619c12015-09-08 11:21:21 +02003413 * return MBEDTLS_ERR_SSL_CLIENT_RECONNECT
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003414 * - if anything goes wrong, return a specific error code
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003415 *
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003416 * mbedtls_ssl_read_record() will ignore the record if anything else than
Simon Butcherd0bf6a32015-09-11 17:34:49 +01003417 * MBEDTLS_ERR_SSL_CLIENT_RECONNECT or 0 is returned, although this function
3418 * cannot not return 0.
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003419 */
3420static int ssl_handle_possible_reconnect( mbedtls_ssl_context *ssl )
3421{
3422 int ret;
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003423 size_t len;
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003424
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003425 ret = ssl_check_dtls_clihlo_cookie(
3426 ssl->conf->f_cookie_write,
3427 ssl->conf->f_cookie_check,
3428 ssl->conf->p_cookie,
3429 ssl->cli_id, ssl->cli_id_len,
3430 ssl->in_buf, ssl->in_left,
3431 ssl->out_buf, MBEDTLS_SSL_MAX_CONTENT_LEN, &len );
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003432
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003433 MBEDTLS_SSL_DEBUG_RET( 2, "ssl_check_dtls_clihlo_cookie", ret );
3434
3435 if( ret == MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED )
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003436 {
Brian J Murray1903fb32016-11-06 04:45:15 -08003437 /* Don't check write errors as we can't do anything here.
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003438 * If the error is permanent we'll catch it later,
3439 * if it's not, then hopefully it'll work next time. */
3440 (void) ssl->f_send( ssl->p_bio, ssl->out_buf, len );
3441
3442 return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED );
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003443 }
3444
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003445 if( ret == 0 )
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003446 {
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003447 /* Got a valid cookie, partially reset context */
3448 if( ( ret = ssl_session_reset_int( ssl, 1 ) ) != 0 )
3449 {
3450 MBEDTLS_SSL_DEBUG_RET( 1, "reset", ret );
3451 return( ret );
3452 }
3453
3454 return( MBEDTLS_ERR_SSL_CLIENT_RECONNECT );
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003455 }
3456
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003457 return( ret );
3458}
Manuel Pégourié-Gonnardddfe5d22015-09-09 12:46:16 +02003459#endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003460
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003461/*
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003462 * ContentType type;
3463 * ProtocolVersion version;
3464 * uint16 epoch; // DTLS only
3465 * uint48 sequence_number; // DTLS only
3466 * uint16 length;
Manuel Pégourié-Gonnarde2e25e72015-12-03 16:13:17 +01003467 *
3468 * Return 0 if header looks sane (and, for DTLS, the record is expected)
Simon Butcher207990d2015-12-16 01:51:30 +00003469 * MBEDTLS_ERR_SSL_INVALID_RECORD if the header looks bad,
Manuel Pégourié-Gonnarde2e25e72015-12-03 16:13:17 +01003470 * MBEDTLS_ERR_SSL_UNEXPECTED_RECORD (DTLS only) if sane but unexpected.
3471 *
3472 * With DTLS, mbedtls_ssl_read_record() will:
Simon Butcher207990d2015-12-16 01:51:30 +00003473 * 1. proceed with the record if this function returns 0
3474 * 2. drop only the current record if this function returns UNEXPECTED_RECORD
3475 * 3. return CLIENT_RECONNECT if this function return that value
3476 * 4. drop the whole datagram if this function returns anything else.
3477 * Point 2 is needed when the peer is resending, and we have already received
3478 * the first record from a datagram but are still waiting for the others.
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003479 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003480static int ssl_parse_record_header( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00003481{
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01003482 int major_ver, minor_ver;
Paul Bakker5121ce52009-01-03 21:22:43 +00003483
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003484 MBEDTLS_SSL_DEBUG_BUF( 4, "input record header", ssl->in_hdr, mbedtls_ssl_hdr_len( ssl ) );
Manuel Pégourié-Gonnard64dffc52014-09-02 13:39:16 +02003485
Paul Bakker5121ce52009-01-03 21:22:43 +00003486 ssl->in_msgtype = ssl->in_hdr[0];
Manuel Pégourié-Gonnard507e1e42014-02-13 11:17:34 +01003487 ssl->in_msglen = ( ssl->in_len[0] << 8 ) | ssl->in_len[1];
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003488 mbedtls_ssl_read_version( &major_ver, &minor_ver, ssl->conf->transport, ssl->in_hdr + 1 );
Paul Bakker5121ce52009-01-03 21:22:43 +00003489
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003490 MBEDTLS_SSL_DEBUG_MSG( 3, ( "input record: msgtype = %d, "
Paul Bakker5121ce52009-01-03 21:22:43 +00003491 "version = [%d:%d], msglen = %d",
Manuel Pégourié-Gonnardedcbe542014-08-11 19:27:24 +02003492 ssl->in_msgtype,
3493 major_ver, minor_ver, ssl->in_msglen ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00003494
Manuel Pégourié-Gonnardedcbe542014-08-11 19:27:24 +02003495 /* Check record type */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003496 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE &&
3497 ssl->in_msgtype != MBEDTLS_SSL_MSG_ALERT &&
3498 ssl->in_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC &&
3499 ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA )
Manuel Pégourié-Gonnardedcbe542014-08-11 19:27:24 +02003500 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003501 MBEDTLS_SSL_DEBUG_MSG( 1, ( "unknown record type" ) );
Andres Amaya Garcia2fad94b2017-06-26 15:11:59 +01003502
3503#if defined(MBEDTLS_SSL_PROTO_DTLS)
Andres Amaya Garcia01692532017-06-28 09:26:46 +01003504 /* Silently ignore invalid DTLS records as recommended by RFC 6347
3505 * Section 4.1.2.7 */
Andres Amaya Garcia2fad94b2017-06-26 15:11:59 +01003506 if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM )
3507#endif /* MBEDTLS_SSL_PROTO_DTLS */
3508 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
3509 MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
3510
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003511 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Manuel Pégourié-Gonnardedcbe542014-08-11 19:27:24 +02003512 }
3513
3514 /* Check version */
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01003515 if( major_ver != ssl->major_ver )
Paul Bakker5121ce52009-01-03 21:22:43 +00003516 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003517 MBEDTLS_SSL_DEBUG_MSG( 1, ( "major version mismatch" ) );
3518 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Paul Bakker5121ce52009-01-03 21:22:43 +00003519 }
3520
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003521 if( minor_ver > ssl->conf->max_minor_ver )
Paul Bakker5121ce52009-01-03 21:22:43 +00003522 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003523 MBEDTLS_SSL_DEBUG_MSG( 1, ( "minor version mismatch" ) );
3524 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Paul Bakker5121ce52009-01-03 21:22:43 +00003525 }
3526
Manuel Pégourié-Gonnardedcbe542014-08-11 19:27:24 +02003527 /* Check length against the size of our buffer */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003528 if( ssl->in_msglen > MBEDTLS_SSL_BUFFER_LEN
Manuel Pégourié-Gonnardedcbe542014-08-11 19:27:24 +02003529 - (size_t)( ssl->in_msg - ssl->in_buf ) )
Paul Bakker1a1fbba2014-04-30 14:38:05 +02003530 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003531 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3532 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Paul Bakker1a1fbba2014-04-30 14:38:05 +02003533 }
3534
Manuel Pégourié-Gonnardedcbe542014-08-11 19:27:24 +02003535 /* Check length against bounds of the current transform and version */
Paul Bakker48916f92012-09-16 19:57:18 +00003536 if( ssl->transform_in == NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00003537 {
Manuel Pégourié-Gonnardedcbe542014-08-11 19:27:24 +02003538 if( ssl->in_msglen < 1 ||
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003539 ssl->in_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN )
Paul Bakker5121ce52009-01-03 21:22:43 +00003540 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003541 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3542 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Paul Bakker5121ce52009-01-03 21:22:43 +00003543 }
3544 }
3545 else
3546 {
Paul Bakker48916f92012-09-16 19:57:18 +00003547 if( ssl->in_msglen < ssl->transform_in->minlen )
Paul Bakker5121ce52009-01-03 21:22:43 +00003548 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003549 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3550 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Paul Bakker5121ce52009-01-03 21:22:43 +00003551 }
3552
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003553#if defined(MBEDTLS_SSL_PROTO_SSL3)
3554 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 &&
3555 ssl->in_msglen > ssl->transform_in->minlen + MBEDTLS_SSL_MAX_CONTENT_LEN )
Paul Bakker5121ce52009-01-03 21:22:43 +00003556 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003557 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3558 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Paul Bakker5121ce52009-01-03 21:22:43 +00003559 }
Paul Bakkerd2f068e2013-08-27 21:19:20 +02003560#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003561#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
3562 defined(MBEDTLS_SSL_PROTO_TLS1_2)
Paul Bakker5121ce52009-01-03 21:22:43 +00003563 /*
3564 * TLS encrypted messages can have up to 256 bytes of padding
3565 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003566 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 &&
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +02003567 ssl->in_msglen > ssl->transform_in->minlen +
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003568 MBEDTLS_SSL_MAX_CONTENT_LEN + 256 )
Paul Bakker5121ce52009-01-03 21:22:43 +00003569 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003570 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3571 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Paul Bakker5121ce52009-01-03 21:22:43 +00003572 }
Paul Bakkerd2f068e2013-08-27 21:19:20 +02003573#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00003574 }
3575
Manuel Pégourié-Gonnarde2e25e72015-12-03 16:13:17 +01003576 /*
3577 * DTLS-related tests done last, because most of them may result in
3578 * silently dropping the record (but not the whole datagram), and we only
3579 * want to consider that after ensuring that the "basic" fields (type,
3580 * version, length) are sane.
3581 */
3582#if defined(MBEDTLS_SSL_PROTO_DTLS)
3583 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
3584 {
3585 unsigned int rec_epoch = ( ssl->in_ctr[0] << 8 ) | ssl->in_ctr[1];
3586
3587 /* Drop unexpected ChangeCipherSpec messages */
3588 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC &&
3589 ssl->state != MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC &&
3590 ssl->state != MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC )
3591 {
3592 MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping unexpected ChangeCipherSpec" ) );
3593 return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
3594 }
3595
3596 /* Drop unexpected ApplicationData records,
3597 * except at the beginning of renegotiations */
3598 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA &&
3599 ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER
3600#if defined(MBEDTLS_SSL_RENEGOTIATION)
3601 && ! ( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
3602 ssl->state == MBEDTLS_SSL_SERVER_HELLO )
3603#endif
3604 )
3605 {
3606 MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping unexpected ApplicationData" ) );
3607 return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
3608 }
3609
3610 /* Check epoch (and sequence number) with DTLS */
3611 if( rec_epoch != ssl->in_epoch )
3612 {
3613 MBEDTLS_SSL_DEBUG_MSG( 1, ( "record from another epoch: "
3614 "expected %d, received %d",
3615 ssl->in_epoch, rec_epoch ) );
3616
3617#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C)
3618 /*
3619 * Check for an epoch 0 ClientHello. We can't use in_msg here to
3620 * access the first byte of record content (handshake type), as we
3621 * have an active transform (possibly iv_len != 0), so use the
3622 * fact that the record header len is 13 instead.
3623 */
3624 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
3625 ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER &&
3626 rec_epoch == 0 &&
3627 ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
3628 ssl->in_left > 13 &&
3629 ssl->in_buf[13] == MBEDTLS_SSL_HS_CLIENT_HELLO )
3630 {
3631 MBEDTLS_SSL_DEBUG_MSG( 1, ( "possible client reconnect "
3632 "from the same port" ) );
3633 return( ssl_handle_possible_reconnect( ssl ) );
3634 }
3635 else
3636#endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */
3637 return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
3638 }
3639
3640#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
3641 /* Replay detection only works for the current epoch */
3642 if( rec_epoch == ssl->in_epoch &&
3643 mbedtls_ssl_dtls_replay_check( ssl ) != 0 )
3644 {
3645 MBEDTLS_SSL_DEBUG_MSG( 1, ( "replayed record" ) );
3646 return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
3647 }
3648#endif
3649 }
3650#endif /* MBEDTLS_SSL_PROTO_DTLS */
3651
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003652 return( 0 );
3653}
Paul Bakker5121ce52009-01-03 21:22:43 +00003654
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003655/*
3656 * If applicable, decrypt (and decompress) record content
3657 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003658static int ssl_prepare_record_content( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003659{
3660 int ret, done = 0;
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02003661
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003662 MBEDTLS_SSL_DEBUG_BUF( 4, "input record from network",
3663 ssl->in_hdr, mbedtls_ssl_hdr_len( ssl ) + ssl->in_msglen );
Paul Bakker5121ce52009-01-03 21:22:43 +00003664
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003665#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
3666 if( mbedtls_ssl_hw_record_read != NULL )
Paul Bakker05ef8352012-05-08 09:17:57 +00003667 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003668 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_read()" ) );
Paul Bakker05ef8352012-05-08 09:17:57 +00003669
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003670 ret = mbedtls_ssl_hw_record_read( ssl );
3671 if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH )
Paul Bakker05ef8352012-05-08 09:17:57 +00003672 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003673 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_read", ret );
3674 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
Paul Bakker05ef8352012-05-08 09:17:57 +00003675 }
Paul Bakkerc7878112012-12-19 14:41:14 +01003676
3677 if( ret == 0 )
3678 done = 1;
Paul Bakker05ef8352012-05-08 09:17:57 +00003679 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003680#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
Paul Bakker48916f92012-09-16 19:57:18 +00003681 if( !done && ssl->transform_in != NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00003682 {
3683 if( ( ret = ssl_decrypt_buf( ssl ) ) != 0 )
3684 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003685 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decrypt_buf", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00003686 return( ret );
3687 }
3688
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003689 MBEDTLS_SSL_DEBUG_BUF( 4, "input payload after decrypt",
Paul Bakker5121ce52009-01-03 21:22:43 +00003690 ssl->in_msg, ssl->in_msglen );
3691
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003692 if( ssl->in_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN )
Paul Bakker5121ce52009-01-03 21:22:43 +00003693 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003694 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3695 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Paul Bakker5121ce52009-01-03 21:22:43 +00003696 }
3697 }
3698
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003699#if defined(MBEDTLS_ZLIB_SUPPORT)
Paul Bakker48916f92012-09-16 19:57:18 +00003700 if( ssl->transform_in != NULL &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003701 ssl->session_in->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
Paul Bakker2770fbd2012-07-03 13:30:23 +00003702 {
3703 if( ( ret = ssl_decompress_buf( ssl ) ) != 0 )
3704 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003705 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decompress_buf", ret );
Paul Bakker2770fbd2012-07-03 13:30:23 +00003706 return( ret );
3707 }
Paul Bakker2770fbd2012-07-03 13:30:23 +00003708 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003709#endif /* MBEDTLS_ZLIB_SUPPORT */
Paul Bakker2770fbd2012-07-03 13:30:23 +00003710
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003711#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003712 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnardb47368a2014-09-24 13:29:58 +02003713 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003714 mbedtls_ssl_dtls_replay_update( ssl );
Manuel Pégourié-Gonnardb47368a2014-09-24 13:29:58 +02003715 }
3716#endif
3717
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003718 return( 0 );
3719}
3720
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003721static void ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl );
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02003722
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003723/*
3724 * Read a record.
3725 *
Manuel Pégourié-Gonnardfbdf06c2015-10-23 11:13:28 +02003726 * Silently ignore non-fatal alert (and for DTLS, invalid records as well,
3727 * RFC 6347 4.1.2.7) and continue reading until a valid record is found.
3728 *
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003729 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003730int mbedtls_ssl_read_record( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003731{
3732 int ret;
3733
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003734 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read record" ) );
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003735
Hanno Beckeraf0665d2017-05-24 09:16:26 +01003736 if( ssl->keep_current_message == 0 )
3737 {
3738 do {
Simon Butcher99000142016-10-13 17:21:01 +01003739
Hanno Beckeraf0665d2017-05-24 09:16:26 +01003740 if( ( ret = mbedtls_ssl_read_record_layer( ssl ) ) != 0 )
3741 {
3742 MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_read_record_layer" ), ret );
3743 return( ret );
3744 }
3745
3746 ret = mbedtls_ssl_handle_message_type( ssl );
3747
3748 } while( MBEDTLS_ERR_SSL_NON_FATAL == ret );
3749
3750 if( 0 != ret )
Simon Butcher99000142016-10-13 17:21:01 +01003751 {
3752 MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_read_record_layer" ), ret );
3753 return( ret );
3754 }
3755
Hanno Beckeraf0665d2017-05-24 09:16:26 +01003756 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
3757 {
3758 mbedtls_ssl_update_handshake_status( ssl );
3759 }
Simon Butcher99000142016-10-13 17:21:01 +01003760 }
Hanno Beckeraf0665d2017-05-24 09:16:26 +01003761 else
Simon Butcher99000142016-10-13 17:21:01 +01003762 {
Hanno Beckeraf0665d2017-05-24 09:16:26 +01003763 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= reuse previously read message" ) );
3764 ssl->keep_current_message = 0;
Simon Butcher99000142016-10-13 17:21:01 +01003765 }
3766
3767 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read record" ) );
3768
3769 return( 0 );
3770}
3771
3772int mbedtls_ssl_read_record_layer( mbedtls_ssl_context *ssl )
3773{
3774 int ret;
3775
Hanno Becker4a810fb2017-05-24 16:27:30 +01003776 /*
3777 * Step A
3778 *
3779 * Consume last content-layer message and potentially
3780 * update in_msglen which keeps track of the contents'
3781 * consumption state.
3782 *
3783 * (1) Handshake messages:
3784 * Remove last handshake message, move content
3785 * and adapt in_msglen.
3786 *
3787 * (2) Alert messages:
3788 * Consume whole record content, in_msglen = 0.
3789 *
3790 * NOTE: This needs to be fixed, since like for
3791 * handshake messages it is allowed to have
3792 * multiple alerts witin a single record.
Hanno Beckerbb9dd0c2017-06-08 11:55:34 +01003793 * Internal reference IOTSSL-1321.
Hanno Becker4a810fb2017-05-24 16:27:30 +01003794 *
3795 * (3) Change cipher spec:
3796 * Consume whole record content, in_msglen = 0.
3797 *
3798 * (4) Application data:
3799 * Don't do anything - the record layer provides
3800 * the application data as a stream transport
3801 * and consumes through mbedtls_ssl_read only.
3802 *
3803 */
3804
3805 /* Case (1): Handshake messages */
3806 if( ssl->in_hslen != 0 )
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003807 {
Hanno Beckerbb9dd0c2017-06-08 11:55:34 +01003808 /* Hard assertion to be sure that no application data
3809 * is in flight, as corrupting ssl->in_msglen during
3810 * ssl->in_offt != NULL is fatal. */
3811 if( ssl->in_offt != NULL )
3812 {
3813 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
3814 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
3815 }
3816
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003817 /*
3818 * Get next Handshake message in the current record
3819 */
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003820
Hanno Becker4a810fb2017-05-24 16:27:30 +01003821 /* Notes:
3822 * (1) in_hslen is *NOT* necessarily the size of the
3823 * current handshake content: If DTLS handshake
3824 * fragmentation is used, that's the fragment
3825 * size instead. Using the total handshake message
3826 * size here is FAULTY and should be changed at
3827 * some point. Internal reference IOTSSL-1414.
3828 * (2) While it doesn't seem to cause problems, one
3829 * has to be very careful not to assume that in_hslen
3830 * is always <= in_msglen in a sensible communication.
3831 * Again, it's wrong for DTLS handshake fragmentation.
3832 * The following check is therefore mandatory, and
3833 * should not be treated as a silently corrected assertion.
Hanno Beckerbb9dd0c2017-06-08 11:55:34 +01003834 * Additionally, ssl->in_hslen might be arbitrarily out of
3835 * bounds after handling a DTLS message with an unexpected
3836 * sequence number, see mbedtls_ssl_prepare_handshake_record.
Hanno Becker4a810fb2017-05-24 16:27:30 +01003837 */
3838 if( ssl->in_hslen < ssl->in_msglen )
3839 {
3840 ssl->in_msglen -= ssl->in_hslen;
3841 memmove( ssl->in_msg, ssl->in_msg + ssl->in_hslen,
3842 ssl->in_msglen );
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003843
Hanno Becker4a810fb2017-05-24 16:27:30 +01003844 MBEDTLS_SSL_DEBUG_BUF( 4, "remaining content in record",
3845 ssl->in_msg, ssl->in_msglen );
3846 }
3847 else
3848 {
3849 ssl->in_msglen = 0;
3850 }
Manuel Pégourié-Gonnard4a175362014-09-09 17:45:31 +02003851
Hanno Becker4a810fb2017-05-24 16:27:30 +01003852 ssl->in_hslen = 0;
3853 }
3854 /* Case (4): Application data */
3855 else if( ssl->in_offt != NULL )
3856 {
3857 return( 0 );
3858 }
3859 /* Everything else (CCS & Alerts) */
3860 else
3861 {
3862 ssl->in_msglen = 0;
3863 }
3864
3865 /*
3866 * Step B
3867 *
3868 * Fetch and decode new record if current one is fully consumed.
3869 *
3870 */
3871
3872 if( ssl->in_msglen > 0 )
3873 {
3874 /* There's something left to be processed in the current record. */
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003875 return( 0 );
3876 }
3877
Hanno Becker4a810fb2017-05-24 16:27:30 +01003878 /* Need to fetch a new record */
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003879
Simon Butcher99000142016-10-13 17:21:01 +01003880#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003881read_record_header:
Simon Butcher99000142016-10-13 17:21:01 +01003882#endif
3883
Hanno Becker4a810fb2017-05-24 16:27:30 +01003884 /* Current record either fully processed or to be discarded. */
3885
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003886 if( ( ret = mbedtls_ssl_fetch_input( ssl, mbedtls_ssl_hdr_len( ssl ) ) ) != 0 )
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003887 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003888 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003889 return( ret );
3890 }
3891
3892 if( ( ret = ssl_parse_record_header( ssl ) ) != 0 )
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003893 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003894#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnardbe619c12015-09-08 11:21:21 +02003895 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
3896 ret != MBEDTLS_ERR_SSL_CLIENT_RECONNECT )
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003897 {
Manuel Pégourié-Gonnarde2e25e72015-12-03 16:13:17 +01003898 if( ret == MBEDTLS_ERR_SSL_UNEXPECTED_RECORD )
3899 {
3900 /* Skip unexpected record (but not whole datagram) */
3901 ssl->next_record_offset = ssl->in_msglen
3902 + mbedtls_ssl_hdr_len( ssl );
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003903
Manuel Pégourié-Gonnarde2e25e72015-12-03 16:13:17 +01003904 MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding unexpected record "
3905 "(header)" ) );
3906 }
3907 else
3908 {
3909 /* Skip invalid record and the rest of the datagram */
3910 ssl->next_record_offset = 0;
3911 ssl->in_left = 0;
3912
3913 MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record "
3914 "(header)" ) );
3915 }
3916
3917 /* Get next record */
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003918 goto read_record_header;
3919 }
3920#endif
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003921 return( ret );
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003922 }
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003923
3924 /*
3925 * Read and optionally decrypt the message contents
3926 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003927 if( ( ret = mbedtls_ssl_fetch_input( ssl,
3928 mbedtls_ssl_hdr_len( ssl ) + ssl->in_msglen ) ) != 0 )
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003929 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003930 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003931 return( ret );
3932 }
3933
3934 /* Done reading this record, get ready for the next one */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003935#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003936 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003937 ssl->next_record_offset = ssl->in_msglen + mbedtls_ssl_hdr_len( ssl );
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003938 else
3939#endif
3940 ssl->in_left = 0;
3941
3942 if( ( ret = ssl_prepare_record_content( ssl ) ) != 0 )
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003943 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003944#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003945 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003946 {
3947 /* Silently discard invalid records */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003948 if( ret == MBEDTLS_ERR_SSL_INVALID_RECORD ||
3949 ret == MBEDTLS_ERR_SSL_INVALID_MAC )
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003950 {
Manuel Pégourié-Gonnard0a885742015-08-04 12:08:35 +02003951 /* Except when waiting for Finished as a bad mac here
3952 * probably means something went wrong in the handshake
3953 * (eg wrong psk used, mitm downgrade attempt, etc.) */
3954 if( ssl->state == MBEDTLS_SSL_CLIENT_FINISHED ||
3955 ssl->state == MBEDTLS_SSL_SERVER_FINISHED )
3956 {
3957#if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES)
3958 if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
3959 {
3960 mbedtls_ssl_send_alert_message( ssl,
3961 MBEDTLS_SSL_ALERT_LEVEL_FATAL,
3962 MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC );
3963 }
3964#endif
3965 return( ret );
3966 }
3967
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003968#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003969 if( ssl->conf->badmac_limit != 0 &&
3970 ++ssl->badmac_seen >= ssl->conf->badmac_limit )
Manuel Pégourié-Gonnardb0643d12014-10-14 18:30:36 +02003971 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003972 MBEDTLS_SSL_DEBUG_MSG( 1, ( "too many records with bad MAC" ) );
3973 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Manuel Pégourié-Gonnardb0643d12014-10-14 18:30:36 +02003974 }
3975#endif
3976
Hanno Becker4a810fb2017-05-24 16:27:30 +01003977 /* As above, invalid records cause
3978 * dismissal of the whole datagram. */
3979
3980 ssl->next_record_offset = 0;
3981 ssl->in_left = 0;
3982
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003983 MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record (mac)" ) );
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003984 goto read_record_header;
3985 }
3986
3987 return( ret );
3988 }
3989 else
3990#endif
3991 {
3992 /* Error out (and send alert) on invalid records */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003993#if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES)
3994 if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003995 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003996 mbedtls_ssl_send_alert_message( ssl,
3997 MBEDTLS_SSL_ALERT_LEVEL_FATAL,
3998 MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC );
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003999 }
4000#endif
4001 return( ret );
4002 }
4003 }
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02004004
4005 /*
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02004006 * When we sent the last flight of the handshake, we MUST respond to a
4007 * retransmit of the peer's previous flight with a retransmit. (In
4008 * practice, only the Finished message will make it, other messages
4009 * including CCS use the old transform so they're dropped as invalid.)
4010 *
4011 * If the record we received is not a handshake message, however, it
4012 * means the peer received our last flight so we can clean up
4013 * handshake info.
4014 *
4015 * This check needs to be done before prepare_handshake() due to an edge
4016 * case: if the client immediately requests renegotiation, this
4017 * finishes the current handshake first, avoiding the new ClientHello
4018 * being mistaken for an ancient message in the current handshake.
4019 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004020#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02004021 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02004022 ssl->handshake != NULL &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004023 ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02004024 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004025 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
4026 ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED )
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02004027 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004028 MBEDTLS_SSL_DEBUG_MSG( 2, ( "received retransmit of last flight" ) );
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02004029
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004030 if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02004031 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004032 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret );
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02004033 return( ret );
4034 }
4035
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01004036 return( MBEDTLS_ERR_SSL_WANT_READ );
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02004037 }
4038 else
4039 {
4040 ssl_handshake_wrapup_free_hs_transform( ssl );
4041 }
4042 }
4043#endif
4044
Simon Butcher99000142016-10-13 17:21:01 +01004045 return( 0 );
4046}
4047
4048int mbedtls_ssl_handle_message_type( mbedtls_ssl_context *ssl )
4049{
4050 int ret;
4051
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02004052 /*
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02004053 * Handle particular types of records
4054 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004055 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
Paul Bakker5121ce52009-01-03 21:22:43 +00004056 {
Simon Butcher99000142016-10-13 17:21:01 +01004057 if( ( ret = mbedtls_ssl_prepare_handshake_record( ssl ) ) != 0 )
4058 {
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01004059 return( ret );
Simon Butcher99000142016-10-13 17:21:01 +01004060 }
Paul Bakker5121ce52009-01-03 21:22:43 +00004061 }
4062
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004063 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT )
Paul Bakker5121ce52009-01-03 21:22:43 +00004064 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004065 MBEDTLS_SSL_DEBUG_MSG( 2, ( "got an alert message, type: [%d:%d]",
Paul Bakker5121ce52009-01-03 21:22:43 +00004066 ssl->in_msg[0], ssl->in_msg[1] ) );
4067
4068 /*
Simon Butcher459a9502015-10-27 16:09:03 +00004069 * Ignore non-fatal alerts, except close_notify and no_renegotiation
Paul Bakker5121ce52009-01-03 21:22:43 +00004070 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004071 if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_FATAL )
Paul Bakker5121ce52009-01-03 21:22:43 +00004072 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004073 MBEDTLS_SSL_DEBUG_MSG( 1, ( "is a fatal alert message (msg %d)",
Paul Bakker2770fbd2012-07-03 13:30:23 +00004074 ssl->in_msg[1] ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004075 return( MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004076 }
4077
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004078 if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
4079 ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY )
Paul Bakker5121ce52009-01-03 21:22:43 +00004080 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004081 MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a close notify message" ) );
4082 return( MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY );
Paul Bakker5121ce52009-01-03 21:22:43 +00004083 }
Manuel Pégourié-Gonnardfbdf06c2015-10-23 11:13:28 +02004084
4085#if defined(MBEDTLS_SSL_RENEGOTIATION_ENABLED)
4086 if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
4087 ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION )
4088 {
4089 MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no_cert" ) );
4090 /* Will be handled when trying to parse ServerHello */
4091 return( 0 );
4092 }
4093#endif
4094
4095#if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_SRV_C)
4096 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 &&
4097 ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
4098 ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
4099 ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT )
4100 {
4101 MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no_cert" ) );
4102 /* Will be handled in mbedtls_ssl_parse_certificate() */
4103 return( 0 );
4104 }
4105#endif /* MBEDTLS_SSL_PROTO_SSL3 && MBEDTLS_SSL_SRV_C */
4106
4107 /* Silently ignore: fetch new message */
Simon Butcher99000142016-10-13 17:21:01 +01004108 return MBEDTLS_ERR_SSL_NON_FATAL;
Paul Bakker5121ce52009-01-03 21:22:43 +00004109 }
4110
Paul Bakker5121ce52009-01-03 21:22:43 +00004111 return( 0 );
4112}
4113
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004114int mbedtls_ssl_send_fatal_handshake_failure( mbedtls_ssl_context *ssl )
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00004115{
4116 int ret;
4117
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004118 if( ( ret = mbedtls_ssl_send_alert_message( ssl,
4119 MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4120 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ) ) != 0 )
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00004121 {
4122 return( ret );
4123 }
4124
4125 return( 0 );
4126}
4127
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004128int mbedtls_ssl_send_alert_message( mbedtls_ssl_context *ssl,
Paul Bakker0a925182012-04-16 06:46:41 +00004129 unsigned char level,
4130 unsigned char message )
4131{
4132 int ret;
4133
Manuel Pégourié-Gonnardf81ee2e2015-09-01 17:43:40 +02004134 if( ssl == NULL || ssl->conf == NULL )
4135 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
4136
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004137 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> send alert message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004138 MBEDTLS_SSL_DEBUG_MSG( 3, ( "send alert level=%u message=%u", level, message ));
Paul Bakker0a925182012-04-16 06:46:41 +00004139
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004140 ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT;
Paul Bakker0a925182012-04-16 06:46:41 +00004141 ssl->out_msglen = 2;
4142 ssl->out_msg[0] = level;
4143 ssl->out_msg[1] = message;
4144
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004145 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
Paul Bakker0a925182012-04-16 06:46:41 +00004146 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004147 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
Paul Bakker0a925182012-04-16 06:46:41 +00004148 return( ret );
4149 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004150 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= send alert message" ) );
Paul Bakker0a925182012-04-16 06:46:41 +00004151
4152 return( 0 );
4153}
4154
Paul Bakker5121ce52009-01-03 21:22:43 +00004155/*
4156 * Handshake functions
4157 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004158#if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \
4159 !defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) && \
4160 !defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
4161 !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \
4162 !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) && \
4163 !defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \
4164 !defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
Gilles Peskinef9828522017-05-03 12:28:43 +02004165/* No certificate support -> dummy functions */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004166int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00004167{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004168 const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
Paul Bakker5121ce52009-01-03 21:22:43 +00004169
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004170 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004171
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004172 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
4173 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
Manuel Pégourié-Gonnard25dbeb02015-09-16 17:30:03 +02004174 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
4175 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
Paul Bakkerd4a56ec2013-04-16 18:05:29 +02004176 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004177 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
Paul Bakkerd4a56ec2013-04-16 18:05:29 +02004178 ssl->state++;
4179 return( 0 );
4180 }
4181
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004182 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
4183 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004184}
4185
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004186int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004187{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004188 const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004189
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004190 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004191
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004192 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
4193 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
Manuel Pégourié-Gonnard25dbeb02015-09-16 17:30:03 +02004194 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
4195 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004196 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004197 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004198 ssl->state++;
4199 return( 0 );
4200 }
4201
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004202 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
4203 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004204}
Gilles Peskinef9828522017-05-03 12:28:43 +02004205
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004206#else
Gilles Peskinef9828522017-05-03 12:28:43 +02004207/* Some certificate support -> implement write and parse */
4208
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004209int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004210{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004211 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004212 size_t i, n;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004213 const mbedtls_x509_crt *crt;
4214 const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004215
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004216 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004217
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004218 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
4219 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
Manuel Pégourié-Gonnard25dbeb02015-09-16 17:30:03 +02004220 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
4221 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004222 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004223 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004224 ssl->state++;
4225 return( 0 );
4226 }
4227
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004228#if defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02004229 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
Paul Bakker5121ce52009-01-03 21:22:43 +00004230 {
4231 if( ssl->client_auth == 0 )
4232 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004233 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004234 ssl->state++;
4235 return( 0 );
4236 }
4237
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004238#if defined(MBEDTLS_SSL_PROTO_SSL3)
Paul Bakker5121ce52009-01-03 21:22:43 +00004239 /*
4240 * If using SSLv3 and got no cert, send an Alert message
4241 * (otherwise an empty Certificate message will be sent).
4242 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004243 if( mbedtls_ssl_own_cert( ssl ) == NULL &&
4244 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004245 {
4246 ssl->out_msglen = 2;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004247 ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT;
4248 ssl->out_msg[0] = MBEDTLS_SSL_ALERT_LEVEL_WARNING;
4249 ssl->out_msg[1] = MBEDTLS_SSL_ALERT_MSG_NO_CERT;
Paul Bakker5121ce52009-01-03 21:22:43 +00004250
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004251 MBEDTLS_SSL_DEBUG_MSG( 2, ( "got no certificate to send" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004252 goto write_msg;
4253 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004254#endif /* MBEDTLS_SSL_PROTO_SSL3 */
Paul Bakker5121ce52009-01-03 21:22:43 +00004255 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004256#endif /* MBEDTLS_SSL_CLI_C */
4257#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02004258 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
Paul Bakker5121ce52009-01-03 21:22:43 +00004259 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004260 if( mbedtls_ssl_own_cert( ssl ) == NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00004261 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004262 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no certificate to send" ) );
4263 return( MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED );
Paul Bakker5121ce52009-01-03 21:22:43 +00004264 }
4265 }
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +01004266#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00004267
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004268 MBEDTLS_SSL_DEBUG_CRT( 3, "own certificate", mbedtls_ssl_own_cert( ssl ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004269
4270 /*
4271 * 0 . 0 handshake type
4272 * 1 . 3 handshake length
4273 * 4 . 6 length of all certs
4274 * 7 . 9 length of cert. 1
4275 * 10 . n-1 peer certificate
4276 * n . n+2 length of cert. 2
4277 * n+3 . ... upper level cert, etc.
4278 */
4279 i = 7;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004280 crt = mbedtls_ssl_own_cert( ssl );
Paul Bakker5121ce52009-01-03 21:22:43 +00004281
Paul Bakker29087132010-03-21 21:03:34 +00004282 while( crt != NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00004283 {
4284 n = crt->raw.len;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004285 if( n > MBEDTLS_SSL_MAX_CONTENT_LEN - 3 - i )
Paul Bakker5121ce52009-01-03 21:22:43 +00004286 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004287 MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate too large, %d > %d",
4288 i + 3 + n, MBEDTLS_SSL_MAX_CONTENT_LEN ) );
4289 return( MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004290 }
4291
4292 ssl->out_msg[i ] = (unsigned char)( n >> 16 );
4293 ssl->out_msg[i + 1] = (unsigned char)( n >> 8 );
4294 ssl->out_msg[i + 2] = (unsigned char)( n );
4295
4296 i += 3; memcpy( ssl->out_msg + i, crt->raw.p, n );
4297 i += n; crt = crt->next;
4298 }
4299
4300 ssl->out_msg[4] = (unsigned char)( ( i - 7 ) >> 16 );
4301 ssl->out_msg[5] = (unsigned char)( ( i - 7 ) >> 8 );
4302 ssl->out_msg[6] = (unsigned char)( ( i - 7 ) );
4303
4304 ssl->out_msglen = i;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004305 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
4306 ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE;
Paul Bakker5121ce52009-01-03 21:22:43 +00004307
Manuel Pégourié-Gonnardcf141ca2015-05-20 10:35:51 +02004308#if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_CLI_C)
Paul Bakker5121ce52009-01-03 21:22:43 +00004309write_msg:
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004310#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00004311
4312 ssl->state++;
4313
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004314 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004315 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004316 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00004317 return( ret );
4318 }
4319
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004320 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004321
Paul Bakkered27a042013-04-18 22:46:23 +02004322 return( ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00004323}
4324
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004325int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00004326{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004327 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
Paul Bakker23986e52011-04-24 08:57:21 +00004328 size_t i, n;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004329 const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02004330 int authmode = ssl->conf->authmode;
Gilles Peskine064a85c2017-05-10 10:46:40 +02004331 uint8_t alert;
Paul Bakker5121ce52009-01-03 21:22:43 +00004332
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004333 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004334
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004335 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
4336 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
Manuel Pégourié-Gonnard25dbeb02015-09-16 17:30:03 +02004337 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
4338 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
Paul Bakkerd4a56ec2013-04-16 18:05:29 +02004339 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004340 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
Paul Bakkerd4a56ec2013-04-16 18:05:29 +02004341 ssl->state++;
4342 return( 0 );
4343 }
4344
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004345#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02004346 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02004347 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
4348 {
4349 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
4350 ssl->state++;
4351 return( 0 );
4352 }
4353
4354#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
4355 if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET )
4356 authmode = ssl->handshake->sni_authmode;
4357#endif
4358
4359 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
4360 authmode == MBEDTLS_SSL_VERIFY_NONE )
Paul Bakker5121ce52009-01-03 21:22:43 +00004361 {
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01004362 ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_SKIP_VERIFY;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004363 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004364 ssl->state++;
4365 return( 0 );
4366 }
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +01004367#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00004368
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004369 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004370 {
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004371 /* mbedtls_ssl_read_record may have sent an alert already. We
4372 let it decide whether to alert. */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004373 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00004374 return( ret );
4375 }
4376
4377 ssl->state++;
4378
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004379#if defined(MBEDTLS_SSL_SRV_C)
4380#if defined(MBEDTLS_SSL_PROTO_SSL3)
Paul Bakker5121ce52009-01-03 21:22:43 +00004381 /*
4382 * Check if the client sent an empty certificate
4383 */
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02004384 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004385 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004386 {
Paul Bakker2e11f7d2010-07-25 14:24:53 +00004387 if( ssl->in_msglen == 2 &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004388 ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT &&
4389 ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
4390 ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT )
Paul Bakker5121ce52009-01-03 21:22:43 +00004391 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004392 MBEDTLS_SSL_DEBUG_MSG( 1, ( "SSLv3 client has no certificate" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004393
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004394 /* The client was asked for a certificate but didn't send
4395 one. The client should know what's going on, so we
4396 don't send an alert. */
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01004397 ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING;
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02004398 if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL )
Paul Bakker5121ce52009-01-03 21:22:43 +00004399 return( 0 );
4400 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004401 return( MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004402 }
4403 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004404#endif /* MBEDTLS_SSL_PROTO_SSL3 */
Paul Bakker5121ce52009-01-03 21:22:43 +00004405
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004406#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
4407 defined(MBEDTLS_SSL_PROTO_TLS1_2)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02004408 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004409 ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004410 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004411 if( ssl->in_hslen == 3 + mbedtls_ssl_hs_hdr_len( ssl ) &&
4412 ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
4413 ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE &&
4414 memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ), "\0\0\0", 3 ) == 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004415 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004416 MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLSv1 client has no certificate" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004417
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004418 /* The client was asked for a certificate but didn't send
4419 one. The client should know what's going on, so we
4420 don't send an alert. */
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01004421 ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING;
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02004422 if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL )
Paul Bakker5121ce52009-01-03 21:22:43 +00004423 return( 0 );
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02004424 else
4425 return( MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004426 }
4427 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004428#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
4429 MBEDTLS_SSL_PROTO_TLS1_2 */
4430#endif /* MBEDTLS_SSL_SRV_C */
Paul Bakker5121ce52009-01-03 21:22:43 +00004431
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004432 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
Paul Bakker5121ce52009-01-03 21:22:43 +00004433 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004434 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004435 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4436 MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004437 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004438 }
4439
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004440 if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE ||
4441 ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 3 + 3 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004442 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004443 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004444 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4445 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004446 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004447 }
4448
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004449 i = mbedtls_ssl_hs_hdr_len( ssl );
Manuel Pégourié-Gonnardf49a7da2014-09-10 13:30:43 +00004450
Paul Bakker5121ce52009-01-03 21:22:43 +00004451 /*
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004452 * Same message structure as in mbedtls_ssl_write_certificate()
Paul Bakker5121ce52009-01-03 21:22:43 +00004453 */
Manuel Pégourié-Gonnardf49a7da2014-09-10 13:30:43 +00004454 n = ( ssl->in_msg[i+1] << 8 ) | ssl->in_msg[i+2];
Paul Bakker5121ce52009-01-03 21:22:43 +00004455
Manuel Pégourié-Gonnardf49a7da2014-09-10 13:30:43 +00004456 if( ssl->in_msg[i] != 0 ||
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004457 ssl->in_hslen != n + 3 + mbedtls_ssl_hs_hdr_len( ssl ) )
Paul Bakker5121ce52009-01-03 21:22:43 +00004458 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004459 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004460 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4461 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004462 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004463 }
4464
Manuel Pégourié-Gonnardbfb355c2013-09-07 17:27:43 +02004465 /* In case we tried to reuse a session but it failed */
4466 if( ssl->session_negotiate->peer_cert != NULL )
4467 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004468 mbedtls_x509_crt_free( ssl->session_negotiate->peer_cert );
4469 mbedtls_free( ssl->session_negotiate->peer_cert );
Manuel Pégourié-Gonnardbfb355c2013-09-07 17:27:43 +02004470 }
4471
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02004472 if( ( ssl->session_negotiate->peer_cert = mbedtls_calloc( 1,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004473 sizeof( mbedtls_x509_crt ) ) ) == NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00004474 {
Manuel Pégourié-Gonnardb2a18a22015-05-27 16:29:56 +02004475 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed",
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004476 sizeof( mbedtls_x509_crt ) ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004477 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4478 MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02004479 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Paul Bakker5121ce52009-01-03 21:22:43 +00004480 }
4481
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004482 mbedtls_x509_crt_init( ssl->session_negotiate->peer_cert );
Paul Bakker5121ce52009-01-03 21:22:43 +00004483
Manuel Pégourié-Gonnardf49a7da2014-09-10 13:30:43 +00004484 i += 3;
Paul Bakker5121ce52009-01-03 21:22:43 +00004485
4486 while( i < ssl->in_hslen )
4487 {
4488 if( ssl->in_msg[i] != 0 )
4489 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004490 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004491 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4492 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004493 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004494 }
4495
4496 n = ( (unsigned int) ssl->in_msg[i + 1] << 8 )
4497 | (unsigned int) ssl->in_msg[i + 2];
4498 i += 3;
4499
4500 if( n < 128 || i + n > ssl->in_hslen )
4501 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004502 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004503 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4504 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004505 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004506 }
4507
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004508 ret = mbedtls_x509_crt_parse_der( ssl->session_negotiate->peer_cert,
Paul Bakkerddf26b42013-09-18 13:46:23 +02004509 ssl->in_msg + i, n );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004510 switch( ret )
Paul Bakker5121ce52009-01-03 21:22:43 +00004511 {
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004512 case 0: /*ok*/
4513 case MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + MBEDTLS_ERR_OID_NOT_FOUND:
4514 /* Ignore certificate with an unknown algorithm: maybe a
4515 prior certificate was already trusted. */
4516 break;
4517
4518 case MBEDTLS_ERR_X509_ALLOC_FAILED:
4519 alert = MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR;
4520 goto crt_parse_der_failed;
4521
4522 case MBEDTLS_ERR_X509_UNKNOWN_VERSION:
4523 alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
4524 goto crt_parse_der_failed;
4525
4526 default:
4527 alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT;
4528 crt_parse_der_failed:
4529 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, alert );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004530 MBEDTLS_SSL_DEBUG_RET( 1, " mbedtls_x509_crt_parse_der", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00004531 return( ret );
4532 }
4533
4534 i += n;
4535 }
4536
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004537 MBEDTLS_SSL_DEBUG_CRT( 3, "peer certificate", ssl->session_negotiate->peer_cert );
Paul Bakker5121ce52009-01-03 21:22:43 +00004538
Manuel Pégourié-Gonnard796c6f32014-03-10 09:34:49 +01004539 /*
4540 * On client, make sure the server cert doesn't change during renego to
4541 * avoid "triple handshake" attack: https://secure-resumption.com/
4542 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004543#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02004544 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004545 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
Manuel Pégourié-Gonnard796c6f32014-03-10 09:34:49 +01004546 {
4547 if( ssl->session->peer_cert == NULL )
4548 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004549 MBEDTLS_SSL_DEBUG_MSG( 1, ( "new server cert during renegotiation" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004550 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4551 MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004552 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
Manuel Pégourié-Gonnard796c6f32014-03-10 09:34:49 +01004553 }
4554
4555 if( ssl->session->peer_cert->raw.len !=
4556 ssl->session_negotiate->peer_cert->raw.len ||
4557 memcmp( ssl->session->peer_cert->raw.p,
4558 ssl->session_negotiate->peer_cert->raw.p,
4559 ssl->session->peer_cert->raw.len ) != 0 )
4560 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004561 MBEDTLS_SSL_DEBUG_MSG( 1, ( "server cert changed during renegotiation" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004562 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4563 MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004564 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
Manuel Pégourié-Gonnard796c6f32014-03-10 09:34:49 +01004565 }
4566 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004567#endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */
Manuel Pégourié-Gonnard796c6f32014-03-10 09:34:49 +01004568
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02004569 if( authmode != MBEDTLS_SSL_VERIFY_NONE )
Paul Bakker5121ce52009-01-03 21:22:43 +00004570 {
Manuel Pégourié-Gonnard22bfa4b2015-05-11 08:46:37 +02004571 mbedtls_x509_crt *ca_chain;
4572 mbedtls_x509_crl *ca_crl;
4573
Manuel Pégourié-Gonnard8b431fb2015-05-11 12:54:52 +02004574#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
Manuel Pégourié-Gonnard22bfa4b2015-05-11 08:46:37 +02004575 if( ssl->handshake->sni_ca_chain != NULL )
4576 {
4577 ca_chain = ssl->handshake->sni_ca_chain;
4578 ca_crl = ssl->handshake->sni_ca_crl;
4579 }
4580 else
Manuel Pégourié-Gonnard8b431fb2015-05-11 12:54:52 +02004581#endif
Manuel Pégourié-Gonnard22bfa4b2015-05-11 08:46:37 +02004582 {
4583 ca_chain = ssl->conf->ca_chain;
4584 ca_crl = ssl->conf->ca_crl;
4585 }
4586
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02004587 /*
4588 * Main check: verify certificate
4589 */
Manuel Pégourié-Gonnard6e3ee3a2015-06-17 10:58:20 +02004590 ret = mbedtls_x509_crt_verify_with_profile(
4591 ssl->session_negotiate->peer_cert,
4592 ca_chain, ca_crl,
4593 ssl->conf->cert_profile,
4594 ssl->hostname,
4595 &ssl->session_negotiate->verify_result,
4596 ssl->conf->f_vrfy, ssl->conf->p_vrfy );
Paul Bakker5121ce52009-01-03 21:22:43 +00004597
4598 if( ret != 0 )
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01004599 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004600 MBEDTLS_SSL_DEBUG_RET( 1, "x509_verify_cert", ret );
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01004601 }
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02004602
4603 /*
4604 * Secondary checks: always done, but change 'ret' only if it was 0
4605 */
4606
Manuel Pégourié-Gonnardb541da62015-06-17 11:43:30 +02004607#if defined(MBEDTLS_ECP_C)
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01004608 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004609 const mbedtls_pk_context *pk = &ssl->session_negotiate->peer_cert->pk;
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01004610
4611 /* If certificate uses an EC key, make sure the curve is OK */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004612 if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECKEY ) &&
Manuel Pégourié-Gonnard9d412d82015-06-17 12:10:46 +02004613 mbedtls_ssl_check_curve( ssl, mbedtls_pk_ec( *pk )->grp.id ) != 0 )
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01004614 {
Hanno Becker39ae8cd2017-05-08 16:31:14 +01004615 ssl->session_negotiate->verify_result |= MBEDTLS_X509_BADCERT_BAD_KEY;
4616
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004617 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (EC key curve)" ) );
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02004618 if( ret == 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004619 ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01004620 }
4621 }
Manuel Pégourié-Gonnardb541da62015-06-17 11:43:30 +02004622#endif /* MBEDTLS_ECP_C */
Paul Bakker5121ce52009-01-03 21:22:43 +00004623
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004624 if( mbedtls_ssl_check_cert_usage( ssl->session_negotiate->peer_cert,
Hanno Becker39ae8cd2017-05-08 16:31:14 +01004625 ciphersuite_info,
4626 ! ssl->conf->endpoint,
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01004627 &ssl->session_negotiate->verify_result ) != 0 )
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02004628 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004629 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (usage extensions)" ) );
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02004630 if( ret == 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004631 ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02004632 }
4633
Hanno Becker39ae8cd2017-05-08 16:31:14 +01004634 /* mbedtls_x509_crt_verify_with_profile is supposed to report a
4635 * verification failure through MBEDTLS_ERR_X509_CERT_VERIFY_FAILED,
4636 * with details encoded in the verification flags. All other kinds
4637 * of error codes, including those from the user provided f_vrfy
4638 * functions, are treated as fatal and lead to a failure of
4639 * ssl_parse_certificate even if verification was optional. */
4640 if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL &&
4641 ( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED ||
4642 ret == MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ) )
4643 {
Paul Bakker5121ce52009-01-03 21:22:43 +00004644 ret = 0;
Hanno Becker39ae8cd2017-05-08 16:31:14 +01004645 }
4646
4647 if( ca_chain == NULL && authmode == MBEDTLS_SSL_VERIFY_REQUIRED )
4648 {
4649 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no CA chain" ) );
4650 ret = MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED;
4651 }
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004652
4653 if( ret != 0 )
4654 {
4655 /* The certificate may have been rejected for several reasons.
4656 Pick one and send the corresponding alert. Which alert to send
4657 may be a subject of debate in some cases. */
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004658 if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_OTHER )
4659 alert = MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED;
4660 else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_CN_MISMATCH )
4661 alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT;
4662 else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_KEY_USAGE )
4663 alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
4664 else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXT_KEY_USAGE )
4665 alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
4666 else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NS_CERT_TYPE )
4667 alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
4668 else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_PK )
4669 alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
4670 else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_KEY )
4671 alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
4672 else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXPIRED )
4673 alert = MBEDTLS_SSL_ALERT_MSG_CERT_EXPIRED;
4674 else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_REVOKED )
4675 alert = MBEDTLS_SSL_ALERT_MSG_CERT_REVOKED;
4676 else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NOT_TRUSTED )
4677 alert = MBEDTLS_SSL_ALERT_MSG_UNKNOWN_CA;
Gilles Peskine8498cb32017-05-10 15:39:40 +02004678 else
4679 alert = MBEDTLS_SSL_ALERT_MSG_CERT_UNKNOWN;
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004680 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4681 alert );
4682 }
Hanno Becker39ae8cd2017-05-08 16:31:14 +01004683
Hanno Beckere6706e62017-05-15 16:05:15 +01004684#if defined(MBEDTLS_DEBUG_C)
4685 if( ssl->session_negotiate->verify_result != 0 )
4686 {
4687 MBEDTLS_SSL_DEBUG_MSG( 3, ( "! Certificate verification flags %x",
4688 ssl->session_negotiate->verify_result ) );
4689 }
4690 else
4691 {
4692 MBEDTLS_SSL_DEBUG_MSG( 3, ( "Certificate verification flags clear" ) );
4693 }
4694#endif /* MBEDTLS_DEBUG_C */
Paul Bakker5121ce52009-01-03 21:22:43 +00004695 }
4696
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004697 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004698
4699 return( ret );
4700}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004701#endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED
4702 !MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED
4703 !MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED
4704 !MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED
4705 !MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED
4706 !MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED
4707 !MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
Paul Bakker5121ce52009-01-03 21:22:43 +00004708
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004709int mbedtls_ssl_write_change_cipher_spec( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00004710{
4711 int ret;
4712
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004713 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write change cipher spec" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004714
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004715 ssl->out_msgtype = MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC;
Paul Bakker5121ce52009-01-03 21:22:43 +00004716 ssl->out_msglen = 1;
4717 ssl->out_msg[0] = 1;
4718
Paul Bakker5121ce52009-01-03 21:22:43 +00004719 ssl->state++;
4720
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004721 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004722 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004723 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00004724 return( ret );
4725 }
4726
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004727 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write change cipher spec" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004728
4729 return( 0 );
4730}
4731
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004732int mbedtls_ssl_parse_change_cipher_spec( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00004733{
4734 int ret;
4735
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004736 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse change cipher spec" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004737
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004738 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004739 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004740 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00004741 return( ret );
4742 }
4743
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004744 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC )
Paul Bakker5121ce52009-01-03 21:22:43 +00004745 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004746 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004747 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4748 MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004749 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004750 }
4751
4752 if( ssl->in_msglen != 1 || ssl->in_msg[0] != 1 )
4753 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004754 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004755 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4756 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004757 return( MBEDTLS_ERR_SSL_BAD_HS_CHANGE_CIPHER_SPEC );
Paul Bakker5121ce52009-01-03 21:22:43 +00004758 }
4759
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004760 /*
4761 * Switch to our negotiated transform and session parameters for inbound
4762 * data.
4763 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004764 MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for inbound data" ) );
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004765 ssl->transform_in = ssl->transform_negotiate;
4766 ssl->session_in = ssl->session_negotiate;
4767
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004768#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02004769 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004770 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004771#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004772 ssl_dtls_replay_reset( ssl );
4773#endif
4774
4775 /* Increment epoch */
4776 if( ++ssl->in_epoch == 0 )
4777 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004778 MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004779 /* This is highly unlikely to happen for legitimate reasons, so
4780 treat it as an attack and don't send an alert. */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004781 return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004782 }
4783 }
4784 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004785#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004786 memset( ssl->in_ctr, 0, 8 );
4787
4788 /*
4789 * Set the in_msg pointer to the correct location based on IV length
4790 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004791 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004792 {
4793 ssl->in_msg = ssl->in_iv + ssl->transform_negotiate->ivlen -
4794 ssl->transform_negotiate->fixed_ivlen;
4795 }
4796 else
4797 ssl->in_msg = ssl->in_iv;
4798
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004799#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
4800 if( mbedtls_ssl_hw_record_activate != NULL )
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004801 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004802 if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_INBOUND ) ) != 0 )
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004803 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004804 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02004805 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4806 MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004807 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004808 }
4809 }
4810#endif
4811
Paul Bakker5121ce52009-01-03 21:22:43 +00004812 ssl->state++;
4813
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004814 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse change cipher spec" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004815
4816 return( 0 );
4817}
4818
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004819void mbedtls_ssl_optimize_checksum( mbedtls_ssl_context *ssl,
4820 const mbedtls_ssl_ciphersuite_t *ciphersuite_info )
Paul Bakker380da532012-04-18 16:10:25 +00004821{
Paul Bakkerfb08fd22013-08-27 15:06:26 +02004822 ((void) ciphersuite_info);
Paul Bakker769075d2012-11-24 11:26:46 +01004823
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004824#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
4825 defined(MBEDTLS_SSL_PROTO_TLS1_1)
4826 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
Paul Bakker48916f92012-09-16 19:57:18 +00004827 ssl->handshake->update_checksum = ssl_update_checksum_md5sha1;
Paul Bakker380da532012-04-18 16:10:25 +00004828 else
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004829#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004830#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4831#if defined(MBEDTLS_SHA512_C)
4832 if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004833 ssl->handshake->update_checksum = ssl_update_checksum_sha384;
4834 else
4835#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004836#if defined(MBEDTLS_SHA256_C)
4837 if( ciphersuite_info->mac != MBEDTLS_MD_SHA384 )
Paul Bakker48916f92012-09-16 19:57:18 +00004838 ssl->handshake->update_checksum = ssl_update_checksum_sha256;
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004839 else
4840#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004841#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Manuel Pégourié-Gonnard61edffe2014-04-11 17:07:31 +02004842 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004843 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004844 return;
Manuel Pégourié-Gonnard61edffe2014-04-11 17:07:31 +02004845 }
Paul Bakker380da532012-04-18 16:10:25 +00004846}
Paul Bakkerf7abd422013-04-16 13:15:56 +02004847
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004848void mbedtls_ssl_reset_checksum( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard67427c02014-07-11 13:45:34 +02004849{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004850#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
4851 defined(MBEDTLS_SSL_PROTO_TLS1_1)
4852 mbedtls_md5_starts( &ssl->handshake->fin_md5 );
4853 mbedtls_sha1_starts( &ssl->handshake->fin_sha1 );
Manuel Pégourié-Gonnard67427c02014-07-11 13:45:34 +02004854#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004855#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4856#if defined(MBEDTLS_SHA256_C)
4857 mbedtls_sha256_starts( &ssl->handshake->fin_sha256, 0 );
Manuel Pégourié-Gonnard67427c02014-07-11 13:45:34 +02004858#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004859#if defined(MBEDTLS_SHA512_C)
4860 mbedtls_sha512_starts( &ssl->handshake->fin_sha512, 1 );
Manuel Pégourié-Gonnard67427c02014-07-11 13:45:34 +02004861#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004862#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Manuel Pégourié-Gonnard67427c02014-07-11 13:45:34 +02004863}
4864
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004865static void ssl_update_checksum_start( mbedtls_ssl_context *ssl,
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +02004866 const unsigned char *buf, size_t len )
Paul Bakker380da532012-04-18 16:10:25 +00004867{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004868#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
4869 defined(MBEDTLS_SSL_PROTO_TLS1_1)
4870 mbedtls_md5_update( &ssl->handshake->fin_md5 , buf, len );
4871 mbedtls_sha1_update( &ssl->handshake->fin_sha1, buf, len );
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004872#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004873#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4874#if defined(MBEDTLS_SHA256_C)
4875 mbedtls_sha256_update( &ssl->handshake->fin_sha256, buf, len );
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004876#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004877#if defined(MBEDTLS_SHA512_C)
4878 mbedtls_sha512_update( &ssl->handshake->fin_sha512, buf, len );
Paul Bakker769075d2012-11-24 11:26:46 +01004879#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004880#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker380da532012-04-18 16:10:25 +00004881}
4882
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004883#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
4884 defined(MBEDTLS_SSL_PROTO_TLS1_1)
4885static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *ssl,
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +02004886 const unsigned char *buf, size_t len )
Paul Bakker380da532012-04-18 16:10:25 +00004887{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004888 mbedtls_md5_update( &ssl->handshake->fin_md5 , buf, len );
4889 mbedtls_sha1_update( &ssl->handshake->fin_sha1, buf, len );
Paul Bakker380da532012-04-18 16:10:25 +00004890}
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004891#endif
Paul Bakker380da532012-04-18 16:10:25 +00004892
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004893#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4894#if defined(MBEDTLS_SHA256_C)
4895static void ssl_update_checksum_sha256( mbedtls_ssl_context *ssl,
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +02004896 const unsigned char *buf, size_t len )
Paul Bakker380da532012-04-18 16:10:25 +00004897{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004898 mbedtls_sha256_update( &ssl->handshake->fin_sha256, buf, len );
Paul Bakker380da532012-04-18 16:10:25 +00004899}
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004900#endif
Paul Bakker380da532012-04-18 16:10:25 +00004901
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004902#if defined(MBEDTLS_SHA512_C)
4903static void ssl_update_checksum_sha384( mbedtls_ssl_context *ssl,
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +02004904 const unsigned char *buf, size_t len )
Paul Bakker380da532012-04-18 16:10:25 +00004905{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004906 mbedtls_sha512_update( &ssl->handshake->fin_sha512, buf, len );
Paul Bakker380da532012-04-18 16:10:25 +00004907}
Paul Bakker769075d2012-11-24 11:26:46 +01004908#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004909#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker380da532012-04-18 16:10:25 +00004910
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004911#if defined(MBEDTLS_SSL_PROTO_SSL3)
Paul Bakker1ef83d62012-04-11 12:09:53 +00004912static void ssl_calc_finished_ssl(
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004913 mbedtls_ssl_context *ssl, unsigned char *buf, int from )
Paul Bakker5121ce52009-01-03 21:22:43 +00004914{
Paul Bakker3c2122f2013-06-24 19:03:14 +02004915 const char *sender;
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004916 mbedtls_md5_context md5;
4917 mbedtls_sha1_context sha1;
Paul Bakker1ef83d62012-04-11 12:09:53 +00004918
Paul Bakker5121ce52009-01-03 21:22:43 +00004919 unsigned char padbuf[48];
4920 unsigned char md5sum[16];
4921 unsigned char sha1sum[20];
4922
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004923 mbedtls_ssl_session *session = ssl->session_negotiate;
Paul Bakker48916f92012-09-16 19:57:18 +00004924 if( !session )
4925 session = ssl->session;
4926
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004927 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished ssl" ) );
Paul Bakker1ef83d62012-04-11 12:09:53 +00004928
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02004929 mbedtls_md5_init( &md5 );
4930 mbedtls_sha1_init( &sha1 );
4931
4932 mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
4933 mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
Paul Bakker5121ce52009-01-03 21:22:43 +00004934
4935 /*
4936 * SSLv3:
4937 * hash =
4938 * MD5( master + pad2 +
4939 * MD5( handshake + sender + master + pad1 ) )
4940 * + SHA1( master + pad2 +
4941 * SHA1( handshake + sender + master + pad1 ) )
Paul Bakker5121ce52009-01-03 21:22:43 +00004942 */
4943
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004944#if !defined(MBEDTLS_MD5_ALT)
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004945 MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
4946 md5.state, sizeof( md5.state ) );
Paul Bakker90995b52013-06-24 19:20:35 +02004947#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00004948
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004949#if !defined(MBEDTLS_SHA1_ALT)
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004950 MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
4951 sha1.state, sizeof( sha1.state ) );
Paul Bakker90995b52013-06-24 19:20:35 +02004952#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00004953
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004954 sender = ( from == MBEDTLS_SSL_IS_CLIENT ) ? "CLNT"
Paul Bakker3c2122f2013-06-24 19:03:14 +02004955 : "SRVR";
Paul Bakker5121ce52009-01-03 21:22:43 +00004956
Paul Bakker1ef83d62012-04-11 12:09:53 +00004957 memset( padbuf, 0x36, 48 );
Paul Bakker5121ce52009-01-03 21:22:43 +00004958
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004959 mbedtls_md5_update( &md5, (const unsigned char *) sender, 4 );
4960 mbedtls_md5_update( &md5, session->master, 48 );
4961 mbedtls_md5_update( &md5, padbuf, 48 );
4962 mbedtls_md5_finish( &md5, md5sum );
Paul Bakker5121ce52009-01-03 21:22:43 +00004963
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004964 mbedtls_sha1_update( &sha1, (const unsigned char *) sender, 4 );
4965 mbedtls_sha1_update( &sha1, session->master, 48 );
4966 mbedtls_sha1_update( &sha1, padbuf, 40 );
4967 mbedtls_sha1_finish( &sha1, sha1sum );
Paul Bakker5121ce52009-01-03 21:22:43 +00004968
Paul Bakker1ef83d62012-04-11 12:09:53 +00004969 memset( padbuf, 0x5C, 48 );
Paul Bakker5121ce52009-01-03 21:22:43 +00004970
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004971 mbedtls_md5_starts( &md5 );
4972 mbedtls_md5_update( &md5, session->master, 48 );
4973 mbedtls_md5_update( &md5, padbuf, 48 );
4974 mbedtls_md5_update( &md5, md5sum, 16 );
4975 mbedtls_md5_finish( &md5, buf );
Paul Bakker5121ce52009-01-03 21:22:43 +00004976
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004977 mbedtls_sha1_starts( &sha1 );
4978 mbedtls_sha1_update( &sha1, session->master, 48 );
4979 mbedtls_sha1_update( &sha1, padbuf , 40 );
4980 mbedtls_sha1_update( &sha1, sha1sum, 20 );
4981 mbedtls_sha1_finish( &sha1, buf + 16 );
Paul Bakker5121ce52009-01-03 21:22:43 +00004982
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004983 MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, 36 );
Paul Bakker5121ce52009-01-03 21:22:43 +00004984
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004985 mbedtls_md5_free( &md5 );
4986 mbedtls_sha1_free( &sha1 );
Paul Bakker5121ce52009-01-03 21:22:43 +00004987
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004988 mbedtls_zeroize( padbuf, sizeof( padbuf ) );
4989 mbedtls_zeroize( md5sum, sizeof( md5sum ) );
4990 mbedtls_zeroize( sha1sum, sizeof( sha1sum ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004991
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004992 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004993}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004994#endif /* MBEDTLS_SSL_PROTO_SSL3 */
Paul Bakker5121ce52009-01-03 21:22:43 +00004995
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004996#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
Paul Bakker1ef83d62012-04-11 12:09:53 +00004997static void ssl_calc_finished_tls(
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004998 mbedtls_ssl_context *ssl, unsigned char *buf, int from )
Paul Bakker5121ce52009-01-03 21:22:43 +00004999{
Paul Bakker1ef83d62012-04-11 12:09:53 +00005000 int len = 12;
Paul Bakker3c2122f2013-06-24 19:03:14 +02005001 const char *sender;
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005002 mbedtls_md5_context md5;
5003 mbedtls_sha1_context sha1;
Paul Bakker1ef83d62012-04-11 12:09:53 +00005004 unsigned char padbuf[36];
Paul Bakker5121ce52009-01-03 21:22:43 +00005005
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005006 mbedtls_ssl_session *session = ssl->session_negotiate;
Paul Bakker48916f92012-09-16 19:57:18 +00005007 if( !session )
5008 session = ssl->session;
5009
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005010 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00005011
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02005012 mbedtls_md5_init( &md5 );
5013 mbedtls_sha1_init( &sha1 );
5014
5015 mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
5016 mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
Paul Bakker5121ce52009-01-03 21:22:43 +00005017
Paul Bakker1ef83d62012-04-11 12:09:53 +00005018 /*
5019 * TLSv1:
5020 * hash = PRF( master, finished_label,
5021 * MD5( handshake ) + SHA1( handshake ) )[0..11]
5022 */
Paul Bakker5121ce52009-01-03 21:22:43 +00005023
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005024#if !defined(MBEDTLS_MD5_ALT)
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005025 MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
5026 md5.state, sizeof( md5.state ) );
Paul Bakker90995b52013-06-24 19:20:35 +02005027#endif
Paul Bakker1ef83d62012-04-11 12:09:53 +00005028
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005029#if !defined(MBEDTLS_SHA1_ALT)
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005030 MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
5031 sha1.state, sizeof( sha1.state ) );
Paul Bakker90995b52013-06-24 19:20:35 +02005032#endif
Paul Bakker1ef83d62012-04-11 12:09:53 +00005033
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005034 sender = ( from == MBEDTLS_SSL_IS_CLIENT )
Paul Bakker3c2122f2013-06-24 19:03:14 +02005035 ? "client finished"
5036 : "server finished";
Paul Bakker1ef83d62012-04-11 12:09:53 +00005037
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005038 mbedtls_md5_finish( &md5, padbuf );
5039 mbedtls_sha1_finish( &sha1, padbuf + 16 );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005040
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +02005041 ssl->handshake->tls_prf( session->master, 48, sender,
Paul Bakker48916f92012-09-16 19:57:18 +00005042 padbuf, 36, buf, len );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005043
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005044 MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005045
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005046 mbedtls_md5_free( &md5 );
5047 mbedtls_sha1_free( &sha1 );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005048
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005049 mbedtls_zeroize( padbuf, sizeof( padbuf ) );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005050
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005051 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005052}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005053#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
Paul Bakker1ef83d62012-04-11 12:09:53 +00005054
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005055#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
5056#if defined(MBEDTLS_SHA256_C)
Paul Bakkerca4ab492012-04-18 14:23:57 +00005057static void ssl_calc_finished_tls_sha256(
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005058 mbedtls_ssl_context *ssl, unsigned char *buf, int from )
Paul Bakker1ef83d62012-04-11 12:09:53 +00005059{
5060 int len = 12;
Paul Bakker3c2122f2013-06-24 19:03:14 +02005061 const char *sender;
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005062 mbedtls_sha256_context sha256;
Paul Bakker1ef83d62012-04-11 12:09:53 +00005063 unsigned char padbuf[32];
5064
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005065 mbedtls_ssl_session *session = ssl->session_negotiate;
Paul Bakker48916f92012-09-16 19:57:18 +00005066 if( !session )
5067 session = ssl->session;
5068
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02005069 mbedtls_sha256_init( &sha256 );
5070
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005071 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha256" ) );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005072
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02005073 mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005074
5075 /*
5076 * TLSv1.2:
5077 * hash = PRF( master, finished_label,
5078 * Hash( handshake ) )[0.11]
5079 */
5080
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005081#if !defined(MBEDTLS_SHA256_ALT)
5082 MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha2 state", (unsigned char *)
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005083 sha256.state, sizeof( sha256.state ) );
Paul Bakker90995b52013-06-24 19:20:35 +02005084#endif
Paul Bakker1ef83d62012-04-11 12:09:53 +00005085
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005086 sender = ( from == MBEDTLS_SSL_IS_CLIENT )
Paul Bakker3c2122f2013-06-24 19:03:14 +02005087 ? "client finished"
5088 : "server finished";
Paul Bakker1ef83d62012-04-11 12:09:53 +00005089
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005090 mbedtls_sha256_finish( &sha256, padbuf );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005091
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +02005092 ssl->handshake->tls_prf( session->master, 48, sender,
Paul Bakker48916f92012-09-16 19:57:18 +00005093 padbuf, 32, buf, len );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005094
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005095 MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005096
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005097 mbedtls_sha256_free( &sha256 );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005098
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005099 mbedtls_zeroize( padbuf, sizeof( padbuf ) );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005100
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005101 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005102}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005103#endif /* MBEDTLS_SHA256_C */
Paul Bakker1ef83d62012-04-11 12:09:53 +00005104
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005105#if defined(MBEDTLS_SHA512_C)
Paul Bakkerca4ab492012-04-18 14:23:57 +00005106static void ssl_calc_finished_tls_sha384(
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005107 mbedtls_ssl_context *ssl, unsigned char *buf, int from )
Paul Bakkerca4ab492012-04-18 14:23:57 +00005108{
5109 int len = 12;
Paul Bakker3c2122f2013-06-24 19:03:14 +02005110 const char *sender;
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005111 mbedtls_sha512_context sha512;
Paul Bakkerca4ab492012-04-18 14:23:57 +00005112 unsigned char padbuf[48];
5113
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005114 mbedtls_ssl_session *session = ssl->session_negotiate;
Paul Bakker48916f92012-09-16 19:57:18 +00005115 if( !session )
5116 session = ssl->session;
5117
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02005118 mbedtls_sha512_init( &sha512 );
5119
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005120 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha384" ) );
Paul Bakkerca4ab492012-04-18 14:23:57 +00005121
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02005122 mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 );
Paul Bakkerca4ab492012-04-18 14:23:57 +00005123
5124 /*
5125 * TLSv1.2:
5126 * hash = PRF( master, finished_label,
5127 * Hash( handshake ) )[0.11]
5128 */
5129
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005130#if !defined(MBEDTLS_SHA512_ALT)
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005131 MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha512 state", (unsigned char *)
5132 sha512.state, sizeof( sha512.state ) );
Paul Bakker90995b52013-06-24 19:20:35 +02005133#endif
Paul Bakkerca4ab492012-04-18 14:23:57 +00005134
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005135 sender = ( from == MBEDTLS_SSL_IS_CLIENT )
Paul Bakker3c2122f2013-06-24 19:03:14 +02005136 ? "client finished"
5137 : "server finished";
Paul Bakkerca4ab492012-04-18 14:23:57 +00005138
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005139 mbedtls_sha512_finish( &sha512, padbuf );
Paul Bakkerca4ab492012-04-18 14:23:57 +00005140
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +02005141 ssl->handshake->tls_prf( session->master, 48, sender,
Paul Bakker48916f92012-09-16 19:57:18 +00005142 padbuf, 48, buf, len );
Paul Bakkerca4ab492012-04-18 14:23:57 +00005143
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005144 MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
Paul Bakkerca4ab492012-04-18 14:23:57 +00005145
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005146 mbedtls_sha512_free( &sha512 );
Paul Bakkerca4ab492012-04-18 14:23:57 +00005147
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005148 mbedtls_zeroize( padbuf, sizeof( padbuf ) );
Paul Bakkerca4ab492012-04-18 14:23:57 +00005149
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005150 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
Paul Bakkerca4ab492012-04-18 14:23:57 +00005151}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005152#endif /* MBEDTLS_SHA512_C */
5153#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakkerca4ab492012-04-18 14:23:57 +00005154
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005155static void ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl )
Paul Bakker48916f92012-09-16 19:57:18 +00005156{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005157 MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup: final free" ) );
Paul Bakker48916f92012-09-16 19:57:18 +00005158
5159 /*
5160 * Free our handshake params
5161 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005162 mbedtls_ssl_handshake_free( ssl->handshake );
5163 mbedtls_free( ssl->handshake );
Paul Bakker48916f92012-09-16 19:57:18 +00005164 ssl->handshake = NULL;
5165
5166 /*
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005167 * Free the previous transform and swith in the current one
Paul Bakker48916f92012-09-16 19:57:18 +00005168 */
5169 if( ssl->transform )
5170 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005171 mbedtls_ssl_transform_free( ssl->transform );
5172 mbedtls_free( ssl->transform );
Paul Bakker48916f92012-09-16 19:57:18 +00005173 }
5174 ssl->transform = ssl->transform_negotiate;
5175 ssl->transform_negotiate = NULL;
5176
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005177 MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup: final free" ) );
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005178}
5179
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005180void mbedtls_ssl_handshake_wrapup( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005181{
5182 int resume = ssl->handshake->resume;
5183
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005184 MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup" ) );
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005185
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005186#if defined(MBEDTLS_SSL_RENEGOTIATION)
5187 if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005188 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005189 ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_DONE;
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005190 ssl->renego_records_seen = 0;
5191 }
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01005192#endif
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005193
5194 /*
5195 * Free the previous session and switch in the current one
5196 */
Paul Bakker0a597072012-09-25 21:55:46 +00005197 if( ssl->session )
5198 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005199#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
Manuel Pégourié-Gonnard1a034732014-11-04 17:36:18 +01005200 /* RFC 7366 3.1: keep the EtM state */
5201 ssl->session_negotiate->encrypt_then_mac =
5202 ssl->session->encrypt_then_mac;
5203#endif
5204
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005205 mbedtls_ssl_session_free( ssl->session );
5206 mbedtls_free( ssl->session );
Paul Bakker0a597072012-09-25 21:55:46 +00005207 }
5208 ssl->session = ssl->session_negotiate;
Paul Bakker48916f92012-09-16 19:57:18 +00005209 ssl->session_negotiate = NULL;
5210
Paul Bakker0a597072012-09-25 21:55:46 +00005211 /*
5212 * Add cache entry
5213 */
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005214 if( ssl->conf->f_set_cache != NULL &&
Manuel Pégourié-Gonnard12ad7982015-06-18 15:50:37 +02005215 ssl->session->id_len != 0 &&
Manuel Pégourié-Gonnardc086cce2013-08-02 14:13:02 +02005216 resume == 0 )
5217 {
Manuel Pégourié-Gonnard5cb33082015-05-06 18:06:26 +01005218 if( ssl->conf->f_set_cache( ssl->conf->p_cache, ssl->session ) != 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005219 MBEDTLS_SSL_DEBUG_MSG( 1, ( "cache did not store session" ) );
Manuel Pégourié-Gonnardc086cce2013-08-02 14:13:02 +02005220 }
Paul Bakker0a597072012-09-25 21:55:46 +00005221
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005222#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005223 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005224 ssl->handshake->flight != NULL )
5225 {
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02005226 /* Cancel handshake timer */
5227 ssl_set_timer( ssl, 0 );
5228
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005229 /* Keep last flight around in case we need to resend it:
5230 * we need the handshake and transform structures for that */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005231 MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip freeing handshake and transform" ) );
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005232 }
5233 else
5234#endif
5235 ssl_handshake_wrapup_free_hs_transform( ssl );
5236
Paul Bakker48916f92012-09-16 19:57:18 +00005237 ssl->state++;
5238
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005239 MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup" ) );
Paul Bakker48916f92012-09-16 19:57:18 +00005240}
5241
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005242int mbedtls_ssl_write_finished( mbedtls_ssl_context *ssl )
Paul Bakker1ef83d62012-04-11 12:09:53 +00005243{
Manuel Pégourié-Gonnard879a4f92014-07-11 22:31:12 +02005244 int ret, hash_len;
Paul Bakker1ef83d62012-04-11 12:09:53 +00005245
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005246 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write finished" ) );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005247
Paul Bakker92be97b2013-01-02 17:30:03 +01005248 /*
5249 * Set the out_msg pointer to the correct location based on IV length
5250 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005251 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
Paul Bakker92be97b2013-01-02 17:30:03 +01005252 {
5253 ssl->out_msg = ssl->out_iv + ssl->transform_negotiate->ivlen -
5254 ssl->transform_negotiate->fixed_ivlen;
5255 }
5256 else
5257 ssl->out_msg = ssl->out_iv;
5258
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005259 ssl->handshake->calc_finished( ssl, ssl->out_msg + 4, ssl->conf->endpoint );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005260
Manuel Pégourié-Gonnard214a8482016-02-22 11:27:26 +01005261 /*
5262 * RFC 5246 7.4.9 (Page 63) says 12 is the default length and ciphersuites
5263 * may define some other value. Currently (early 2016), no defined
5264 * ciphersuite does this (and this is unlikely to change as activity has
5265 * moved to TLS 1.3 now) so we can keep the hardcoded 12 here.
5266 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005267 hash_len = ( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) ? 36 : 12;
Paul Bakker5121ce52009-01-03 21:22:43 +00005268
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005269#if defined(MBEDTLS_SSL_RENEGOTIATION)
Paul Bakker48916f92012-09-16 19:57:18 +00005270 ssl->verify_data_len = hash_len;
5271 memcpy( ssl->own_verify_data, ssl->out_msg + 4, hash_len );
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01005272#endif
Paul Bakker48916f92012-09-16 19:57:18 +00005273
Paul Bakker5121ce52009-01-03 21:22:43 +00005274 ssl->out_msglen = 4 + hash_len;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005275 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
5276 ssl->out_msg[0] = MBEDTLS_SSL_HS_FINISHED;
Paul Bakker5121ce52009-01-03 21:22:43 +00005277
5278 /*
5279 * In case of session resuming, invert the client and server
5280 * ChangeCipherSpec messages order.
5281 */
Paul Bakker0a597072012-09-25 21:55:46 +00005282 if( ssl->handshake->resume != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00005283 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005284#if defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005285 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005286 ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +01005287#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005288#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005289 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005290 ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC;
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +01005291#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00005292 }
5293 else
5294 ssl->state++;
5295
Paul Bakker48916f92012-09-16 19:57:18 +00005296 /*
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +02005297 * Switch to our negotiated transform and session parameters for outbound
5298 * data.
Paul Bakker48916f92012-09-16 19:57:18 +00005299 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005300 MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for outbound data" ) );
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +01005301
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005302#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005303 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard879a4f92014-07-11 22:31:12 +02005304 {
5305 unsigned char i;
5306
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02005307 /* Remember current epoch settings for resending */
5308 ssl->handshake->alt_transform_out = ssl->transform_out;
5309 memcpy( ssl->handshake->alt_out_ctr, ssl->out_ctr, 8 );
5310
Manuel Pégourié-Gonnard879a4f92014-07-11 22:31:12 +02005311 /* Set sequence_number to zero */
5312 memset( ssl->out_ctr + 2, 0, 6 );
5313
5314 /* Increment epoch */
5315 for( i = 2; i > 0; i-- )
5316 if( ++ssl->out_ctr[i - 1] != 0 )
5317 break;
5318
5319 /* The loop goes to its end iff the counter is wrapping */
5320 if( i == 0 )
5321 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005322 MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) );
5323 return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
Manuel Pégourié-Gonnard879a4f92014-07-11 22:31:12 +02005324 }
5325 }
5326 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005327#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnard879a4f92014-07-11 22:31:12 +02005328 memset( ssl->out_ctr, 0, 8 );
Paul Bakker5121ce52009-01-03 21:22:43 +00005329
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02005330 ssl->transform_out = ssl->transform_negotiate;
5331 ssl->session_out = ssl->session_negotiate;
5332
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005333#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
5334 if( mbedtls_ssl_hw_record_activate != NULL )
Paul Bakker07eb38b2012-12-19 14:42:06 +01005335 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005336 if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 )
Paul Bakker07eb38b2012-12-19 14:42:06 +01005337 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005338 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
5339 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
Paul Bakker07eb38b2012-12-19 14:42:06 +01005340 }
5341 }
5342#endif
5343
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005344#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005345 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005346 mbedtls_ssl_send_flight_completed( ssl );
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02005347#endif
5348
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005349 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00005350 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005351 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00005352 return( ret );
5353 }
5354
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005355 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write finished" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00005356
5357 return( 0 );
5358}
5359
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005360#if defined(MBEDTLS_SSL_PROTO_SSL3)
Manuel Pégourié-Gonnardca6440b2014-09-10 12:39:54 +00005361#define SSL_MAX_HASH_LEN 36
5362#else
5363#define SSL_MAX_HASH_LEN 12
5364#endif
5365
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005366int mbedtls_ssl_parse_finished( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00005367{
Paul Bakker23986e52011-04-24 08:57:21 +00005368 int ret;
Manuel Pégourié-Gonnard879a4f92014-07-11 22:31:12 +02005369 unsigned int hash_len;
Manuel Pégourié-Gonnardca6440b2014-09-10 12:39:54 +00005370 unsigned char buf[SSL_MAX_HASH_LEN];
Paul Bakker5121ce52009-01-03 21:22:43 +00005371
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005372 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse finished" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00005373
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005374 ssl->handshake->calc_finished( ssl, buf, ssl->conf->endpoint ^ 1 );
Paul Bakker5121ce52009-01-03 21:22:43 +00005375
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005376 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00005377 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005378 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00005379 return( ret );
5380 }
5381
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005382 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
Paul Bakker5121ce52009-01-03 21:22:43 +00005383 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005384 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02005385 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
5386 MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005387 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Paul Bakker5121ce52009-01-03 21:22:43 +00005388 }
5389
Manuel Pégourié-Gonnardca6440b2014-09-10 12:39:54 +00005390 /* There is currently no ciphersuite using another length with TLS 1.2 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005391#if defined(MBEDTLS_SSL_PROTO_SSL3)
5392 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Manuel Pégourié-Gonnardca6440b2014-09-10 12:39:54 +00005393 hash_len = 36;
5394 else
5395#endif
5396 hash_len = 12;
Paul Bakker5121ce52009-01-03 21:22:43 +00005397
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005398 if( ssl->in_msg[0] != MBEDTLS_SSL_HS_FINISHED ||
5399 ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + hash_len )
Paul Bakker5121ce52009-01-03 21:22:43 +00005400 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005401 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02005402 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
5403 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005404 return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED );
Paul Bakker5121ce52009-01-03 21:22:43 +00005405 }
5406
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005407 if( mbedtls_ssl_safer_memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ),
Manuel Pégourié-Gonnard4abc3272014-09-10 12:02:46 +00005408 buf, hash_len ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00005409 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005410 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02005411 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
5412 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005413 return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED );
Paul Bakker5121ce52009-01-03 21:22:43 +00005414 }
5415
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005416#if defined(MBEDTLS_SSL_RENEGOTIATION)
Paul Bakker48916f92012-09-16 19:57:18 +00005417 ssl->verify_data_len = hash_len;
5418 memcpy( ssl->peer_verify_data, buf, hash_len );
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01005419#endif
Paul Bakker48916f92012-09-16 19:57:18 +00005420
Paul Bakker0a597072012-09-25 21:55:46 +00005421 if( ssl->handshake->resume != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00005422 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005423#if defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005424 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005425 ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC;
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +01005426#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005427#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005428 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005429 ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +01005430#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00005431 }
5432 else
5433 ssl->state++;
5434
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005435#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005436 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005437 mbedtls_ssl_recv_flight_completed( ssl );
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02005438#endif
5439
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005440 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse finished" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00005441
5442 return( 0 );
5443}
5444
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005445static void ssl_handshake_params_init( mbedtls_ssl_handshake_params *handshake )
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005446{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005447 memset( handshake, 0, sizeof( mbedtls_ssl_handshake_params ) );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005448
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005449#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
5450 defined(MBEDTLS_SSL_PROTO_TLS1_1)
5451 mbedtls_md5_init( &handshake->fin_md5 );
5452 mbedtls_sha1_init( &handshake->fin_sha1 );
5453 mbedtls_md5_starts( &handshake->fin_md5 );
5454 mbedtls_sha1_starts( &handshake->fin_sha1 );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005455#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005456#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
5457#if defined(MBEDTLS_SHA256_C)
5458 mbedtls_sha256_init( &handshake->fin_sha256 );
5459 mbedtls_sha256_starts( &handshake->fin_sha256, 0 );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005460#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005461#if defined(MBEDTLS_SHA512_C)
5462 mbedtls_sha512_init( &handshake->fin_sha512 );
5463 mbedtls_sha512_starts( &handshake->fin_sha512, 1 );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005464#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005465#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005466
5467 handshake->update_checksum = ssl_update_checksum_start;
Hanno Becker7e5437a2017-04-28 17:15:26 +01005468
5469#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
5470 defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
5471 mbedtls_ssl_sig_hash_set_init( &handshake->hash_algs );
5472#endif
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005473
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005474#if defined(MBEDTLS_DHM_C)
5475 mbedtls_dhm_init( &handshake->dhm_ctx );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005476#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005477#if defined(MBEDTLS_ECDH_C)
5478 mbedtls_ecdh_init( &handshake->ecdh_ctx );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005479#endif
Manuel Pégourié-Gonnardeef142d2015-09-16 10:05:04 +02005480#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
Manuel Pégourié-Gonnard76cfd3f2015-09-15 12:10:54 +02005481 mbedtls_ecjpake_init( &handshake->ecjpake_ctx );
Manuel Pégourié-Gonnard77c06462015-09-17 13:59:49 +02005482#if defined(MBEDTLS_SSL_CLI_C)
5483 handshake->ecjpake_cache = NULL;
5484 handshake->ecjpake_cache_len = 0;
5485#endif
Manuel Pégourié-Gonnard76cfd3f2015-09-15 12:10:54 +02005486#endif
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02005487
5488#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
5489 handshake->sni_authmode = MBEDTLS_SSL_VERIFY_UNSET;
5490#endif
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005491}
5492
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005493static void ssl_transform_init( mbedtls_ssl_transform *transform )
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005494{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005495 memset( transform, 0, sizeof(mbedtls_ssl_transform) );
Paul Bakker84bbeb52014-07-01 14:53:22 +02005496
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005497 mbedtls_cipher_init( &transform->cipher_ctx_enc );
5498 mbedtls_cipher_init( &transform->cipher_ctx_dec );
Paul Bakker84bbeb52014-07-01 14:53:22 +02005499
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005500 mbedtls_md_init( &transform->md_ctx_enc );
5501 mbedtls_md_init( &transform->md_ctx_dec );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005502}
5503
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005504void mbedtls_ssl_session_init( mbedtls_ssl_session *session )
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005505{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005506 memset( session, 0, sizeof(mbedtls_ssl_session) );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005507}
5508
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005509static int ssl_handshake_init( mbedtls_ssl_context *ssl )
Paul Bakker48916f92012-09-16 19:57:18 +00005510{
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005511 /* Clear old handshake information if present */
Paul Bakker48916f92012-09-16 19:57:18 +00005512 if( ssl->transform_negotiate )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005513 mbedtls_ssl_transform_free( ssl->transform_negotiate );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005514 if( ssl->session_negotiate )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005515 mbedtls_ssl_session_free( ssl->session_negotiate );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005516 if( ssl->handshake )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005517 mbedtls_ssl_handshake_free( ssl->handshake );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005518
5519 /*
5520 * Either the pointers are now NULL or cleared properly and can be freed.
5521 * Now allocate missing structures.
5522 */
5523 if( ssl->transform_negotiate == NULL )
Paul Bakkerb9cfaa02013-10-11 18:58:55 +02005524 {
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02005525 ssl->transform_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_transform) );
Paul Bakkerb9cfaa02013-10-11 18:58:55 +02005526 }
Paul Bakker48916f92012-09-16 19:57:18 +00005527
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005528 if( ssl->session_negotiate == NULL )
Paul Bakkerb9cfaa02013-10-11 18:58:55 +02005529 {
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02005530 ssl->session_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_session) );
Paul Bakkerb9cfaa02013-10-11 18:58:55 +02005531 }
Paul Bakker48916f92012-09-16 19:57:18 +00005532
Paul Bakker82788fb2014-10-20 13:59:19 +02005533 if( ssl->handshake == NULL )
Paul Bakkerb9cfaa02013-10-11 18:58:55 +02005534 {
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02005535 ssl->handshake = mbedtls_calloc( 1, sizeof(mbedtls_ssl_handshake_params) );
Paul Bakkerb9cfaa02013-10-11 18:58:55 +02005536 }
Paul Bakker48916f92012-09-16 19:57:18 +00005537
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005538 /* All pointers should exist and can be directly freed without issue */
Paul Bakker48916f92012-09-16 19:57:18 +00005539 if( ssl->handshake == NULL ||
5540 ssl->transform_negotiate == NULL ||
5541 ssl->session_negotiate == NULL )
5542 {
Manuel Pégourié-Gonnardb2a18a22015-05-27 16:29:56 +02005543 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc() of ssl sub-contexts failed" ) );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005544
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005545 mbedtls_free( ssl->handshake );
5546 mbedtls_free( ssl->transform_negotiate );
5547 mbedtls_free( ssl->session_negotiate );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005548
5549 ssl->handshake = NULL;
5550 ssl->transform_negotiate = NULL;
5551 ssl->session_negotiate = NULL;
5552
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02005553 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Paul Bakker48916f92012-09-16 19:57:18 +00005554 }
5555
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005556 /* Initialize structures */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005557 mbedtls_ssl_session_init( ssl->session_negotiate );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005558 ssl_transform_init( ssl->transform_negotiate );
Paul Bakker968afaa2014-07-09 11:09:24 +02005559 ssl_handshake_params_init( ssl->handshake );
5560
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005561#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard06939ce2015-05-11 11:25:46 +02005562 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
5563 {
5564 ssl->handshake->alt_transform_out = ssl->transform_out;
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02005565
Manuel Pégourié-Gonnard06939ce2015-05-11 11:25:46 +02005566 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
5567 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING;
5568 else
5569 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
Manuel Pégourié-Gonnard286a1362015-05-13 16:22:05 +02005570
5571 ssl_set_timer( ssl, 0 );
Manuel Pégourié-Gonnard06939ce2015-05-11 11:25:46 +02005572 }
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02005573#endif
5574
Paul Bakker48916f92012-09-16 19:57:18 +00005575 return( 0 );
5576}
5577
Manuel Pégourié-Gonnarde057d3b2015-05-20 10:59:43 +02005578#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard7d38d212014-07-23 17:52:09 +02005579/* Dummy cookie callbacks for defaults */
5580static int ssl_cookie_write_dummy( void *ctx,
5581 unsigned char **p, unsigned char *end,
5582 const unsigned char *cli_id, size_t cli_id_len )
5583{
5584 ((void) ctx);
5585 ((void) p);
5586 ((void) end);
5587 ((void) cli_id);
5588 ((void) cli_id_len);
5589
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005590 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
Manuel Pégourié-Gonnard7d38d212014-07-23 17:52:09 +02005591}
5592
5593static int ssl_cookie_check_dummy( void *ctx,
5594 const unsigned char *cookie, size_t cookie_len,
5595 const unsigned char *cli_id, size_t cli_id_len )
5596{
5597 ((void) ctx);
5598 ((void) cookie);
5599 ((void) cookie_len);
5600 ((void) cli_id);
5601 ((void) cli_id_len);
5602
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005603 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
Manuel Pégourié-Gonnard7d38d212014-07-23 17:52:09 +02005604}
Manuel Pégourié-Gonnarde057d3b2015-05-20 10:59:43 +02005605#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */
Manuel Pégourié-Gonnard7d38d212014-07-23 17:52:09 +02005606
Paul Bakker5121ce52009-01-03 21:22:43 +00005607/*
5608 * Initialize an SSL context
5609 */
Manuel Pégourié-Gonnard41d479e2015-04-29 00:48:22 +02005610void mbedtls_ssl_init( mbedtls_ssl_context *ssl )
5611{
5612 memset( ssl, 0, sizeof( mbedtls_ssl_context ) );
5613}
5614
5615/*
5616 * Setup an SSL context
5617 */
Manuel Pégourié-Gonnarddef0bbe2015-05-04 14:56:36 +02005618int mbedtls_ssl_setup( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnard1897af92015-05-10 23:27:38 +02005619 const mbedtls_ssl_config *conf )
Paul Bakker5121ce52009-01-03 21:22:43 +00005620{
Paul Bakker48916f92012-09-16 19:57:18 +00005621 int ret;
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02005622 const size_t len = MBEDTLS_SSL_BUFFER_LEN;
Paul Bakker5121ce52009-01-03 21:22:43 +00005623
Manuel Pégourié-Gonnarddef0bbe2015-05-04 14:56:36 +02005624 ssl->conf = conf;
Paul Bakker62f2dee2012-09-28 07:31:51 +00005625
5626 /*
Manuel Pégourié-Gonnard06193482014-02-14 08:39:32 +01005627 * Prepare base structures
Paul Bakker62f2dee2012-09-28 07:31:51 +00005628 */
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02005629 if( ( ssl-> in_buf = mbedtls_calloc( 1, len ) ) == NULL ||
5630 ( ssl->out_buf = mbedtls_calloc( 1, len ) ) == NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00005631 {
Manuel Pégourié-Gonnardb2a18a22015-05-27 16:29:56 +02005632 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", len ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005633 mbedtls_free( ssl->in_buf );
Manuel Pégourié-Gonnard7ee6f0e2014-02-13 10:54:07 +01005634 ssl->in_buf = NULL;
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02005635 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Paul Bakker5121ce52009-01-03 21:22:43 +00005636 }
5637
Manuel Pégourié-Gonnard419d5ae2015-05-04 19:32:36 +02005638#if defined(MBEDTLS_SSL_PROTO_DTLS)
5639 if( conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
5640 {
5641 ssl->out_hdr = ssl->out_buf;
5642 ssl->out_ctr = ssl->out_buf + 3;
5643 ssl->out_len = ssl->out_buf + 11;
5644 ssl->out_iv = ssl->out_buf + 13;
5645 ssl->out_msg = ssl->out_buf + 13;
5646
5647 ssl->in_hdr = ssl->in_buf;
5648 ssl->in_ctr = ssl->in_buf + 3;
5649 ssl->in_len = ssl->in_buf + 11;
5650 ssl->in_iv = ssl->in_buf + 13;
5651 ssl->in_msg = ssl->in_buf + 13;
5652 }
5653 else
5654#endif
5655 {
5656 ssl->out_ctr = ssl->out_buf;
5657 ssl->out_hdr = ssl->out_buf + 8;
5658 ssl->out_len = ssl->out_buf + 11;
5659 ssl->out_iv = ssl->out_buf + 13;
5660 ssl->out_msg = ssl->out_buf + 13;
5661
5662 ssl->in_ctr = ssl->in_buf;
5663 ssl->in_hdr = ssl->in_buf + 8;
5664 ssl->in_len = ssl->in_buf + 11;
5665 ssl->in_iv = ssl->in_buf + 13;
5666 ssl->in_msg = ssl->in_buf + 13;
5667 }
5668
Paul Bakker48916f92012-09-16 19:57:18 +00005669 if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
5670 return( ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00005671
5672 return( 0 );
5673}
5674
5675/*
Paul Bakker7eb013f2011-10-06 12:37:39 +00005676 * Reset an initialized and used SSL context for re-use while retaining
5677 * all application-set variables, function pointers and data.
Manuel Pégourié-Gonnard3f09b6d2015-09-08 11:58:14 +02005678 *
5679 * If partial is non-zero, keep data in the input buffer and client ID.
5680 * (Use when a DTLS client reconnects from the same port.)
Paul Bakker7eb013f2011-10-06 12:37:39 +00005681 */
Manuel Pégourié-Gonnard3f09b6d2015-09-08 11:58:14 +02005682static int ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial )
Paul Bakker7eb013f2011-10-06 12:37:39 +00005683{
Paul Bakker48916f92012-09-16 19:57:18 +00005684 int ret;
5685
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005686 ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01005687
Manuel Pégourié-Gonnard286a1362015-05-13 16:22:05 +02005688 /* Cancel any possibly running timer */
5689 ssl_set_timer( ssl, 0 );
5690
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005691#if defined(MBEDTLS_SSL_RENEGOTIATION)
5692 ssl->renego_status = MBEDTLS_SSL_INITIAL_HANDSHAKE;
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01005693 ssl->renego_records_seen = 0;
Paul Bakker48916f92012-09-16 19:57:18 +00005694
5695 ssl->verify_data_len = 0;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005696 memset( ssl->own_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN );
5697 memset( ssl->peer_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN );
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01005698#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005699 ssl->secure_renegotiation = MBEDTLS_SSL_LEGACY_RENEGOTIATION;
Paul Bakker48916f92012-09-16 19:57:18 +00005700
Paul Bakker7eb013f2011-10-06 12:37:39 +00005701 ssl->in_offt = NULL;
5702
Manuel Pégourié-Gonnard7ee6f0e2014-02-13 10:54:07 +01005703 ssl->in_msg = ssl->in_buf + 13;
Paul Bakker7eb013f2011-10-06 12:37:39 +00005704 ssl->in_msgtype = 0;
5705 ssl->in_msglen = 0;
Manuel Pégourié-Gonnard3f09b6d2015-09-08 11:58:14 +02005706 if( partial == 0 )
5707 ssl->in_left = 0;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005708#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02005709 ssl->next_record_offset = 0;
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02005710 ssl->in_epoch = 0;
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02005711#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005712#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
Manuel Pégourié-Gonnardb47368a2014-09-24 13:29:58 +02005713 ssl_dtls_replay_reset( ssl );
5714#endif
Paul Bakker7eb013f2011-10-06 12:37:39 +00005715
5716 ssl->in_hslen = 0;
5717 ssl->nb_zero = 0;
Hanno Beckeraf0665d2017-05-24 09:16:26 +01005718
5719 ssl->keep_current_message = 0;
Paul Bakker7eb013f2011-10-06 12:37:39 +00005720
Manuel Pégourié-Gonnard7ee6f0e2014-02-13 10:54:07 +01005721 ssl->out_msg = ssl->out_buf + 13;
Paul Bakker7eb013f2011-10-06 12:37:39 +00005722 ssl->out_msgtype = 0;
5723 ssl->out_msglen = 0;
5724 ssl->out_left = 0;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005725#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
5726 if( ssl->split_done != MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED )
Manuel Pégourié-Gonnardcfa477e2015-01-07 14:50:54 +01005727 ssl->split_done = 0;
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01005728#endif
Paul Bakker7eb013f2011-10-06 12:37:39 +00005729
Paul Bakker48916f92012-09-16 19:57:18 +00005730 ssl->transform_in = NULL;
5731 ssl->transform_out = NULL;
Paul Bakker7eb013f2011-10-06 12:37:39 +00005732
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005733 memset( ssl->out_buf, 0, MBEDTLS_SSL_BUFFER_LEN );
Manuel Pégourié-Gonnard3f09b6d2015-09-08 11:58:14 +02005734 if( partial == 0 )
5735 memset( ssl->in_buf, 0, MBEDTLS_SSL_BUFFER_LEN );
Paul Bakker05ef8352012-05-08 09:17:57 +00005736
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005737#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
5738 if( mbedtls_ssl_hw_record_reset != NULL )
Paul Bakker05ef8352012-05-08 09:17:57 +00005739 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005740 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_reset()" ) );
5741 if( ( ret = mbedtls_ssl_hw_record_reset( ssl ) ) != 0 )
Paul Bakker2770fbd2012-07-03 13:30:23 +00005742 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005743 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_reset", ret );
5744 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
Paul Bakker2770fbd2012-07-03 13:30:23 +00005745 }
Paul Bakker05ef8352012-05-08 09:17:57 +00005746 }
5747#endif
Paul Bakker2770fbd2012-07-03 13:30:23 +00005748
Paul Bakker48916f92012-09-16 19:57:18 +00005749 if( ssl->transform )
Paul Bakker2770fbd2012-07-03 13:30:23 +00005750 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005751 mbedtls_ssl_transform_free( ssl->transform );
5752 mbedtls_free( ssl->transform );
Paul Bakker48916f92012-09-16 19:57:18 +00005753 ssl->transform = NULL;
Paul Bakker2770fbd2012-07-03 13:30:23 +00005754 }
Paul Bakker48916f92012-09-16 19:57:18 +00005755
Paul Bakkerc0463502013-02-14 11:19:38 +01005756 if( ssl->session )
5757 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005758 mbedtls_ssl_session_free( ssl->session );
5759 mbedtls_free( ssl->session );
Paul Bakkerc0463502013-02-14 11:19:38 +01005760 ssl->session = NULL;
5761 }
5762
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005763#if defined(MBEDTLS_SSL_ALPN)
Manuel Pégourié-Gonnard7e250d42014-04-04 16:08:41 +02005764 ssl->alpn_chosen = NULL;
5765#endif
5766
Manuel Pégourié-Gonnarde057d3b2015-05-20 10:59:43 +02005767#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard3f09b6d2015-09-08 11:58:14 +02005768 if( partial == 0 )
5769 {
5770 mbedtls_free( ssl->cli_id );
5771 ssl->cli_id = NULL;
5772 ssl->cli_id_len = 0;
5773 }
Manuel Pégourié-Gonnard43c02182014-07-22 17:32:01 +02005774#endif
5775
Paul Bakker48916f92012-09-16 19:57:18 +00005776 if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
5777 return( ret );
Paul Bakker2770fbd2012-07-03 13:30:23 +00005778
5779 return( 0 );
Paul Bakker7eb013f2011-10-06 12:37:39 +00005780}
5781
Manuel Pégourié-Gonnard779e4292013-08-03 13:50:48 +02005782/*
Manuel Pégourié-Gonnard3f09b6d2015-09-08 11:58:14 +02005783 * Reset an initialized and used SSL context for re-use while retaining
5784 * all application-set variables, function pointers and data.
5785 */
5786int mbedtls_ssl_session_reset( mbedtls_ssl_context *ssl )
5787{
5788 return( ssl_session_reset_int( ssl, 0 ) );
5789}
5790
5791/*
Paul Bakker5121ce52009-01-03 21:22:43 +00005792 * SSL set accessors
5793 */
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005794void mbedtls_ssl_conf_endpoint( mbedtls_ssl_config *conf, int endpoint )
Paul Bakker5121ce52009-01-03 21:22:43 +00005795{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005796 conf->endpoint = endpoint;
Paul Bakker5121ce52009-01-03 21:22:43 +00005797}
5798
Manuel Pégourié-Gonnard01e5e8c2015-05-11 10:11:56 +02005799void mbedtls_ssl_conf_transport( mbedtls_ssl_config *conf, int transport )
Manuel Pégourié-Gonnard0b1ff292014-02-06 13:04:16 +01005800{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005801 conf->transport = transport;
Manuel Pégourié-Gonnard0b1ff292014-02-06 13:04:16 +01005802}
5803
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005804#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005805void mbedtls_ssl_conf_dtls_anti_replay( mbedtls_ssl_config *conf, char mode )
Manuel Pégourié-Gonnard27393132014-09-24 14:41:11 +02005806{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005807 conf->anti_replay = mode;
Manuel Pégourié-Gonnard27393132014-09-24 14:41:11 +02005808}
5809#endif
5810
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005811#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005812void mbedtls_ssl_conf_dtls_badmac_limit( mbedtls_ssl_config *conf, unsigned limit )
Manuel Pégourié-Gonnardb0643d12014-10-14 18:30:36 +02005813{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005814 conf->badmac_limit = limit;
Manuel Pégourié-Gonnardb0643d12014-10-14 18:30:36 +02005815}
5816#endif
5817
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005818#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005819void mbedtls_ssl_conf_handshake_timeout( mbedtls_ssl_config *conf, uint32_t min, uint32_t max )
Manuel Pégourié-Gonnard905dd242014-10-01 12:03:55 +02005820{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005821 conf->hs_timeout_min = min;
5822 conf->hs_timeout_max = max;
Manuel Pégourié-Gonnard905dd242014-10-01 12:03:55 +02005823}
5824#endif
5825
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005826void mbedtls_ssl_conf_authmode( mbedtls_ssl_config *conf, int authmode )
Paul Bakker5121ce52009-01-03 21:22:43 +00005827{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005828 conf->authmode = authmode;
Paul Bakker5121ce52009-01-03 21:22:43 +00005829}
5830
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005831#if defined(MBEDTLS_X509_CRT_PARSE_C)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005832void mbedtls_ssl_conf_verify( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnarde6ef16f2015-05-11 19:54:43 +02005833 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
Paul Bakkerb63b0af2011-01-13 17:54:59 +00005834 void *p_vrfy )
5835{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005836 conf->f_vrfy = f_vrfy;
5837 conf->p_vrfy = p_vrfy;
Paul Bakkerb63b0af2011-01-13 17:54:59 +00005838}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005839#endif /* MBEDTLS_X509_CRT_PARSE_C */
Paul Bakkerb63b0af2011-01-13 17:54:59 +00005840
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005841void mbedtls_ssl_conf_rng( mbedtls_ssl_config *conf,
Paul Bakkera3d195c2011-11-27 21:07:34 +00005842 int (*f_rng)(void *, unsigned char *, size_t),
Paul Bakker5121ce52009-01-03 21:22:43 +00005843 void *p_rng )
5844{
Manuel Pégourié-Gonnard750e4d72015-05-07 12:35:38 +01005845 conf->f_rng = f_rng;
5846 conf->p_rng = p_rng;
Paul Bakker5121ce52009-01-03 21:22:43 +00005847}
5848
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005849void mbedtls_ssl_conf_dbg( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnardfd474232015-06-23 16:34:24 +02005850 void (*f_dbg)(void *, int, const char *, int, const char *),
Paul Bakker5121ce52009-01-03 21:22:43 +00005851 void *p_dbg )
5852{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005853 conf->f_dbg = f_dbg;
5854 conf->p_dbg = p_dbg;
Paul Bakker5121ce52009-01-03 21:22:43 +00005855}
5856
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005857void mbedtls_ssl_set_bio( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnard8fa6dfd2014-09-17 10:47:43 +02005858 void *p_bio,
Simon Butchere846b512016-03-01 17:31:49 +00005859 mbedtls_ssl_send_t *f_send,
5860 mbedtls_ssl_recv_t *f_recv,
5861 mbedtls_ssl_recv_timeout_t *f_recv_timeout )
Manuel Pégourié-Gonnard8fa6dfd2014-09-17 10:47:43 +02005862{
5863 ssl->p_bio = p_bio;
5864 ssl->f_send = f_send;
5865 ssl->f_recv = f_recv;
5866 ssl->f_recv_timeout = f_recv_timeout;
Manuel Pégourié-Gonnard97fd52c2015-05-06 15:38:52 +01005867}
5868
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005869void mbedtls_ssl_conf_read_timeout( mbedtls_ssl_config *conf, uint32_t timeout )
Manuel Pégourié-Gonnard97fd52c2015-05-06 15:38:52 +01005870{
5871 conf->read_timeout = timeout;
Manuel Pégourié-Gonnard8fa6dfd2014-09-17 10:47:43 +02005872}
5873
Manuel Pégourié-Gonnard2e012912015-05-12 20:55:41 +02005874void mbedtls_ssl_set_timer_cb( mbedtls_ssl_context *ssl,
5875 void *p_timer,
Simon Butchere846b512016-03-01 17:31:49 +00005876 mbedtls_ssl_set_timer_t *f_set_timer,
5877 mbedtls_ssl_get_timer_t *f_get_timer )
Manuel Pégourié-Gonnard2e012912015-05-12 20:55:41 +02005878{
5879 ssl->p_timer = p_timer;
5880 ssl->f_set_timer = f_set_timer;
5881 ssl->f_get_timer = f_get_timer;
Manuel Pégourié-Gonnard286a1362015-05-13 16:22:05 +02005882
5883 /* Make sure we start with no timer running */
5884 ssl_set_timer( ssl, 0 );
Manuel Pégourié-Gonnard2e012912015-05-12 20:55:41 +02005885}
5886
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005887#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005888void mbedtls_ssl_conf_session_cache( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnard5cb33082015-05-06 18:06:26 +01005889 void *p_cache,
5890 int (*f_get_cache)(void *, mbedtls_ssl_session *),
5891 int (*f_set_cache)(void *, const mbedtls_ssl_session *) )
Paul Bakker5121ce52009-01-03 21:22:43 +00005892{
Manuel Pégourié-Gonnard5cb33082015-05-06 18:06:26 +01005893 conf->p_cache = p_cache;
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005894 conf->f_get_cache = f_get_cache;
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005895 conf->f_set_cache = f_set_cache;
Paul Bakker5121ce52009-01-03 21:22:43 +00005896}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005897#endif /* MBEDTLS_SSL_SRV_C */
Paul Bakker5121ce52009-01-03 21:22:43 +00005898
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005899#if defined(MBEDTLS_SSL_CLI_C)
5900int mbedtls_ssl_set_session( mbedtls_ssl_context *ssl, const mbedtls_ssl_session *session )
Paul Bakker5121ce52009-01-03 21:22:43 +00005901{
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +02005902 int ret;
5903
5904 if( ssl == NULL ||
5905 session == NULL ||
5906 ssl->session_negotiate == NULL ||
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005907 ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT )
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +02005908 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005909 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +02005910 }
5911
5912 if( ( ret = ssl_session_copy( ssl->session_negotiate, session ) ) != 0 )
5913 return( ret );
5914
Paul Bakker0a597072012-09-25 21:55:46 +00005915 ssl->handshake->resume = 1;
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +02005916
5917 return( 0 );
Paul Bakker5121ce52009-01-03 21:22:43 +00005918}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005919#endif /* MBEDTLS_SSL_CLI_C */
Paul Bakker5121ce52009-01-03 21:22:43 +00005920
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005921void mbedtls_ssl_conf_ciphersuites( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005922 const int *ciphersuites )
Paul Bakker5121ce52009-01-03 21:22:43 +00005923{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005924 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = ciphersuites;
5925 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = ciphersuites;
5926 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = ciphersuites;
5927 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = ciphersuites;
Paul Bakker8f4ddae2013-04-15 15:09:54 +02005928}
5929
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005930void mbedtls_ssl_conf_ciphersuites_for_version( mbedtls_ssl_config *conf,
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +02005931 const int *ciphersuites,
Paul Bakker8f4ddae2013-04-15 15:09:54 +02005932 int major, int minor )
5933{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005934 if( major != MBEDTLS_SSL_MAJOR_VERSION_3 )
Paul Bakker8f4ddae2013-04-15 15:09:54 +02005935 return;
5936
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005937 if( minor < MBEDTLS_SSL_MINOR_VERSION_0 || minor > MBEDTLS_SSL_MINOR_VERSION_3 )
Paul Bakker8f4ddae2013-04-15 15:09:54 +02005938 return;
5939
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005940 conf->ciphersuite_list[minor] = ciphersuites;
Paul Bakker5121ce52009-01-03 21:22:43 +00005941}
5942
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005943#if defined(MBEDTLS_X509_CRT_PARSE_C)
Manuel Pégourié-Gonnard6e3ee3a2015-06-17 10:58:20 +02005944void mbedtls_ssl_conf_cert_profile( mbedtls_ssl_config *conf,
Nicholas Wilson2088e2e2015-09-08 16:53:18 +01005945 const mbedtls_x509_crt_profile *profile )
Manuel Pégourié-Gonnard6e3ee3a2015-06-17 10:58:20 +02005946{
5947 conf->cert_profile = profile;
5948}
5949
Manuel Pégourié-Gonnard8f618a82015-05-10 21:13:36 +02005950/* Append a new keycert entry to a (possibly empty) list */
5951static int ssl_append_key_cert( mbedtls_ssl_key_cert **head,
5952 mbedtls_x509_crt *cert,
5953 mbedtls_pk_context *key )
Manuel Pégourié-Gonnard834ea852013-09-23 14:46:13 +02005954{
Manuel Pégourié-Gonnard8f618a82015-05-10 21:13:36 +02005955 mbedtls_ssl_key_cert *new;
Manuel Pégourié-Gonnard834ea852013-09-23 14:46:13 +02005956
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02005957 new = mbedtls_calloc( 1, sizeof( mbedtls_ssl_key_cert ) );
Manuel Pégourié-Gonnard8f618a82015-05-10 21:13:36 +02005958 if( new == NULL )
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02005959 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Manuel Pégourié-Gonnard834ea852013-09-23 14:46:13 +02005960
Manuel Pégourié-Gonnard8f618a82015-05-10 21:13:36 +02005961 new->cert = cert;
5962 new->key = key;
5963 new->next = NULL;
Manuel Pégourié-Gonnard834ea852013-09-23 14:46:13 +02005964
Manuel Pégourié-Gonnard8f618a82015-05-10 21:13:36 +02005965 /* Update head is the list was null, else add to the end */
5966 if( *head == NULL )
Paul Bakker0333b972013-11-04 17:08:28 +01005967 {
Manuel Pégourié-Gonnard8f618a82015-05-10 21:13:36 +02005968 *head = new;
Paul Bakker0333b972013-11-04 17:08:28 +01005969 }
Manuel Pégourié-Gonnard834ea852013-09-23 14:46:13 +02005970 else
5971 {
Manuel Pégourié-Gonnard8f618a82015-05-10 21:13:36 +02005972 mbedtls_ssl_key_cert *cur = *head;
5973 while( cur->next != NULL )
5974 cur = cur->next;
5975 cur->next = new;
Manuel Pégourié-Gonnard834ea852013-09-23 14:46:13 +02005976 }
5977
Manuel Pégourié-Gonnard8f618a82015-05-10 21:13:36 +02005978 return( 0 );
5979}
5980
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005981int mbedtls_ssl_conf_own_cert( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnard8f618a82015-05-10 21:13:36 +02005982 mbedtls_x509_crt *own_cert,
5983 mbedtls_pk_context *pk_key )
5984{
Manuel Pégourié-Gonnard17a40cd2015-05-10 23:17:17 +02005985 return( ssl_append_key_cert( &conf->key_cert, own_cert, pk_key ) );
Manuel Pégourié-Gonnard834ea852013-09-23 14:46:13 +02005986}
5987
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005988void mbedtls_ssl_conf_ca_chain( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnardbc2b7712015-05-06 11:14:19 +01005989 mbedtls_x509_crt *ca_chain,
5990 mbedtls_x509_crl *ca_crl )
Paul Bakker5121ce52009-01-03 21:22:43 +00005991{
Manuel Pégourié-Gonnardbc2b7712015-05-06 11:14:19 +01005992 conf->ca_chain = ca_chain;
5993 conf->ca_crl = ca_crl;
Paul Bakker5121ce52009-01-03 21:22:43 +00005994}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005995#endif /* MBEDTLS_X509_CRT_PARSE_C */
Paul Bakkereb2c6582012-09-27 19:15:01 +00005996
Manuel Pégourié-Gonnard1af6c852015-05-10 23:10:37 +02005997#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
5998int mbedtls_ssl_set_hs_own_cert( mbedtls_ssl_context *ssl,
5999 mbedtls_x509_crt *own_cert,
6000 mbedtls_pk_context *pk_key )
6001{
6002 return( ssl_append_key_cert( &ssl->handshake->sni_key_cert,
6003 own_cert, pk_key ) );
6004}
Manuel Pégourié-Gonnard22bfa4b2015-05-11 08:46:37 +02006005
6006void mbedtls_ssl_set_hs_ca_chain( mbedtls_ssl_context *ssl,
6007 mbedtls_x509_crt *ca_chain,
6008 mbedtls_x509_crl *ca_crl )
6009{
6010 ssl->handshake->sni_ca_chain = ca_chain;
6011 ssl->handshake->sni_ca_crl = ca_crl;
6012}
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02006013
6014void mbedtls_ssl_set_hs_authmode( mbedtls_ssl_context *ssl,
6015 int authmode )
6016{
6017 ssl->handshake->sni_authmode = authmode;
6018}
Manuel Pégourié-Gonnard1af6c852015-05-10 23:10:37 +02006019#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
6020
Manuel Pégourié-Gonnardeef142d2015-09-16 10:05:04 +02006021#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
Manuel Pégourié-Gonnard7002f4a2015-09-15 12:43:43 +02006022/*
6023 * Set EC J-PAKE password for current handshake
6024 */
6025int mbedtls_ssl_set_hs_ecjpake_password( mbedtls_ssl_context *ssl,
6026 const unsigned char *pw,
6027 size_t pw_len )
6028{
6029 mbedtls_ecjpake_role role;
6030
Janos Follath8eb64132016-06-03 15:40:57 +01006031 if( ssl->handshake == NULL || ssl->conf == NULL )
Manuel Pégourié-Gonnard7002f4a2015-09-15 12:43:43 +02006032 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6033
6034 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
6035 role = MBEDTLS_ECJPAKE_SERVER;
6036 else
6037 role = MBEDTLS_ECJPAKE_CLIENT;
6038
6039 return( mbedtls_ecjpake_setup( &ssl->handshake->ecjpake_ctx,
6040 role,
6041 MBEDTLS_MD_SHA256,
6042 MBEDTLS_ECP_DP_SECP256R1,
6043 pw, pw_len ) );
6044}
Manuel Pégourié-Gonnardeef142d2015-09-16 10:05:04 +02006045#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
Manuel Pégourié-Gonnard7002f4a2015-09-15 12:43:43 +02006046
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006047#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006048int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01006049 const unsigned char *psk, size_t psk_len,
6050 const unsigned char *psk_identity, size_t psk_identity_len )
Paul Bakkerd4a56ec2013-04-16 18:05:29 +02006051{
Paul Bakker6db455e2013-09-18 17:29:31 +02006052 if( psk == NULL || psk_identity == NULL )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006053 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Paul Bakker6db455e2013-09-18 17:29:31 +02006054
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006055 if( psk_len > MBEDTLS_PSK_MAX_LEN )
6056 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnardb2bf5a12014-03-25 16:28:12 +01006057
Manuel Pégourié-Gonnardc6b5d832015-08-27 16:37:35 +02006058 /* Identity len will be encoded on two bytes */
6059 if( ( psk_identity_len >> 16 ) != 0 ||
6060 psk_identity_len > MBEDTLS_SSL_MAX_CONTENT_LEN )
6061 {
6062 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6063 }
6064
Andres Amaya Garciabbafd342017-07-05 14:25:21 +01006065 if( conf->psk != NULL )
Paul Bakker6db455e2013-09-18 17:29:31 +02006066 {
Andres Amaya Garciaa0049882017-06-26 11:35:17 +01006067 mbedtls_zeroize( conf->psk, conf->psk_len );
Andres Amaya Garciabbafd342017-07-05 14:25:21 +01006068
Manuel Pégourié-Gonnard120fdbd2015-05-07 17:07:50 +01006069 mbedtls_free( conf->psk );
Manuel Pégourié-Gonnard173c7902015-10-20 19:56:45 +02006070 conf->psk = NULL;
Andres Amaya Garciabbafd342017-07-05 14:25:21 +01006071 conf->psk_len = 0;
6072 }
6073 if( conf->psk_identity != NULL )
6074 {
6075 mbedtls_free( conf->psk_identity );
Manuel Pégourié-Gonnard173c7902015-10-20 19:56:45 +02006076 conf->psk_identity = NULL;
Andres Amaya Garciabbafd342017-07-05 14:25:21 +01006077 conf->psk_identity_len = 0;
Paul Bakker6db455e2013-09-18 17:29:31 +02006078 }
6079
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02006080 if( ( conf->psk = mbedtls_calloc( 1, psk_len ) ) == NULL ||
6081 ( conf->psk_identity = mbedtls_calloc( 1, psk_identity_len ) ) == NULL )
Mansour Moufidf81088b2015-02-17 13:10:21 -05006082 {
Manuel Pégourié-Gonnard120fdbd2015-05-07 17:07:50 +01006083 mbedtls_free( conf->psk );
Manuel Pégourié-Gonnard24417f02015-09-28 18:09:45 +02006084 mbedtls_free( conf->psk_identity );
Manuel Pégourié-Gonnard120fdbd2015-05-07 17:07:50 +01006085 conf->psk = NULL;
Manuel Pégourié-Gonnard24417f02015-09-28 18:09:45 +02006086 conf->psk_identity = NULL;
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02006087 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Mansour Moufidf81088b2015-02-17 13:10:21 -05006088 }
Paul Bakker6db455e2013-09-18 17:29:31 +02006089
Manuel Pégourié-Gonnard120fdbd2015-05-07 17:07:50 +01006090 conf->psk_len = psk_len;
6091 conf->psk_identity_len = psk_identity_len;
Paul Bakker6db455e2013-09-18 17:29:31 +02006092
Manuel Pégourié-Gonnard120fdbd2015-05-07 17:07:50 +01006093 memcpy( conf->psk, psk, conf->psk_len );
6094 memcpy( conf->psk_identity, psk_identity, conf->psk_identity_len );
Paul Bakker6db455e2013-09-18 17:29:31 +02006095
6096 return( 0 );
6097}
6098
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01006099int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl,
6100 const unsigned char *psk, size_t psk_len )
6101{
6102 if( psk == NULL || ssl->handshake == NULL )
6103 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6104
6105 if( psk_len > MBEDTLS_PSK_MAX_LEN )
6106 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6107
6108 if( ssl->handshake->psk != NULL )
Andres Amaya Garciaa0049882017-06-26 11:35:17 +01006109 {
6110 mbedtls_zeroize( ssl->handshake->psk, ssl->handshake->psk_len );
Simon Butcher5b8d1d62015-10-04 22:06:51 +01006111 mbedtls_free( ssl->handshake->psk );
Andres Amaya Garciabbafd342017-07-05 14:25:21 +01006112 ssl->handshake->psk_len = 0;
Andres Amaya Garciaa0049882017-06-26 11:35:17 +01006113 }
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01006114
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02006115 if( ( ssl->handshake->psk = mbedtls_calloc( 1, psk_len ) ) == NULL )
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02006116 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01006117
6118 ssl->handshake->psk_len = psk_len;
6119 memcpy( ssl->handshake->psk, psk, ssl->handshake->psk_len );
6120
6121 return( 0 );
6122}
6123
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006124void mbedtls_ssl_conf_psk_cb( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006125 int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *,
Paul Bakker6db455e2013-09-18 17:29:31 +02006126 size_t),
6127 void *p_psk )
6128{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006129 conf->f_psk = f_psk;
6130 conf->p_psk = p_psk;
Paul Bakkerd4a56ec2013-04-16 18:05:29 +02006131}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006132#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
Paul Bakker43b7e352011-01-18 15:27:19 +00006133
Manuel Pégourié-Gonnardcf141ca2015-05-20 10:35:51 +02006134#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006135int mbedtls_ssl_conf_dh_param( mbedtls_ssl_config *conf, const char *dhm_P, const char *dhm_G )
Paul Bakker5121ce52009-01-03 21:22:43 +00006136{
6137 int ret;
6138
Manuel Pégourié-Gonnard1028b742015-05-06 17:33:07 +01006139 if( ( ret = mbedtls_mpi_read_string( &conf->dhm_P, 16, dhm_P ) ) != 0 ||
6140 ( ret = mbedtls_mpi_read_string( &conf->dhm_G, 16, dhm_G ) ) != 0 )
6141 {
6142 mbedtls_mpi_free( &conf->dhm_P );
6143 mbedtls_mpi_free( &conf->dhm_G );
Paul Bakker5121ce52009-01-03 21:22:43 +00006144 return( ret );
Manuel Pégourié-Gonnard1028b742015-05-06 17:33:07 +01006145 }
Paul Bakker5121ce52009-01-03 21:22:43 +00006146
6147 return( 0 );
6148}
6149
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006150int mbedtls_ssl_conf_dh_param_ctx( mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx )
Paul Bakker1b57b062011-01-06 15:48:19 +00006151{
6152 int ret;
6153
Manuel Pégourié-Gonnard1028b742015-05-06 17:33:07 +01006154 if( ( ret = mbedtls_mpi_copy( &conf->dhm_P, &dhm_ctx->P ) ) != 0 ||
6155 ( ret = mbedtls_mpi_copy( &conf->dhm_G, &dhm_ctx->G ) ) != 0 )
6156 {
6157 mbedtls_mpi_free( &conf->dhm_P );
6158 mbedtls_mpi_free( &conf->dhm_G );
Paul Bakker1b57b062011-01-06 15:48:19 +00006159 return( ret );
Manuel Pégourié-Gonnard1028b742015-05-06 17:33:07 +01006160 }
Paul Bakker1b57b062011-01-06 15:48:19 +00006161
6162 return( 0 );
6163}
Manuel Pégourié-Gonnardcf141ca2015-05-20 10:35:51 +02006164#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_SRV_C */
Paul Bakker1b57b062011-01-06 15:48:19 +00006165
Manuel Pégourié-Gonnardbd990d62015-06-11 14:49:42 +02006166#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
6167/*
6168 * Set the minimum length for Diffie-Hellman parameters
6169 */
6170void mbedtls_ssl_conf_dhm_min_bitlen( mbedtls_ssl_config *conf,
6171 unsigned int bitlen )
6172{
6173 conf->dhm_min_bitlen = bitlen;
6174}
6175#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */
6176
Manuel Pégourié-Gonnarde5f30722015-10-22 17:01:15 +02006177#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
Manuel Pégourié-Gonnard36a8b572015-06-17 12:43:26 +02006178/*
6179 * Set allowed/preferred hashes for handshake signatures
6180 */
6181void mbedtls_ssl_conf_sig_hashes( mbedtls_ssl_config *conf,
6182 const int *hashes )
6183{
6184 conf->sig_hashes = hashes;
6185}
Hanno Becker947194e2017-04-07 13:25:49 +01006186#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
Manuel Pégourié-Gonnard36a8b572015-06-17 12:43:26 +02006187
Manuel Pégourié-Gonnardb541da62015-06-17 11:43:30 +02006188#if defined(MBEDTLS_ECP_C)
Manuel Pégourié-Gonnard7f38ed02014-02-04 15:52:33 +01006189/*
6190 * Set the allowed elliptic curves
6191 */
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006192void mbedtls_ssl_conf_curves( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006193 const mbedtls_ecp_group_id *curve_list )
Manuel Pégourié-Gonnard7f38ed02014-02-04 15:52:33 +01006194{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006195 conf->curve_list = curve_list;
Manuel Pégourié-Gonnard7f38ed02014-02-04 15:52:33 +01006196}
Hanno Becker947194e2017-04-07 13:25:49 +01006197#endif /* MBEDTLS_ECP_C */
Manuel Pégourié-Gonnard7f38ed02014-02-04 15:52:33 +01006198
Manuel Pégourié-Gonnardbc2b7712015-05-06 11:14:19 +01006199#if defined(MBEDTLS_X509_CRT_PARSE_C)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006200int mbedtls_ssl_set_hostname( mbedtls_ssl_context *ssl, const char *hostname )
Paul Bakker5121ce52009-01-03 21:22:43 +00006201{
Hanno Becker947194e2017-04-07 13:25:49 +01006202 /* Initialize to suppress unnecessary compiler warning */
6203 size_t hostname_len = 0;
6204
6205 /* Check if new hostname is valid before
6206 * making any change to current one */
Hanno Becker947194e2017-04-07 13:25:49 +01006207 if( hostname != NULL )
6208 {
6209 hostname_len = strlen( hostname );
6210
6211 if( hostname_len > MBEDTLS_SSL_MAX_HOST_NAME_LEN )
6212 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6213 }
6214
6215 /* Now it's clear that we will overwrite the old hostname,
6216 * so we can free it safely */
6217
6218 if( ssl->hostname != NULL )
6219 {
6220 mbedtls_zeroize( ssl->hostname, strlen( ssl->hostname ) );
6221 mbedtls_free( ssl->hostname );
6222 }
6223
6224 /* Passing NULL as hostname shall clear the old one */
Manuel Pégourié-Gonnardba26c242015-05-06 10:47:06 +01006225
Paul Bakker5121ce52009-01-03 21:22:43 +00006226 if( hostname == NULL )
Hanno Becker947194e2017-04-07 13:25:49 +01006227 {
6228 ssl->hostname = NULL;
6229 }
6230 else
6231 {
6232 ssl->hostname = mbedtls_calloc( 1, hostname_len + 1 );
Hanno Becker947194e2017-04-07 13:25:49 +01006233 if( ssl->hostname == NULL )
6234 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Paul Bakker75c1a6f2013-08-19 14:25:29 +02006235
Hanno Becker947194e2017-04-07 13:25:49 +01006236 memcpy( ssl->hostname, hostname, hostname_len );
Paul Bakker75c1a6f2013-08-19 14:25:29 +02006237
Hanno Becker947194e2017-04-07 13:25:49 +01006238 ssl->hostname[hostname_len] = '\0';
6239 }
Paul Bakker5121ce52009-01-03 21:22:43 +00006240
6241 return( 0 );
6242}
Hanno Becker1a9a51c2017-04-07 13:02:16 +01006243#endif /* MBEDTLS_X509_CRT_PARSE_C */
Paul Bakker5121ce52009-01-03 21:22:43 +00006244
Manuel Pégourié-Gonnardbc2b7712015-05-06 11:14:19 +01006245#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006246void mbedtls_ssl_conf_sni( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006247 int (*f_sni)(void *, mbedtls_ssl_context *,
Paul Bakker5701cdc2012-09-27 21:49:42 +00006248 const unsigned char *, size_t),
6249 void *p_sni )
6250{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006251 conf->f_sni = f_sni;
6252 conf->p_sni = p_sni;
Paul Bakker5701cdc2012-09-27 21:49:42 +00006253}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006254#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
Paul Bakker5701cdc2012-09-27 21:49:42 +00006255
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006256#if defined(MBEDTLS_SSL_ALPN)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006257int mbedtls_ssl_conf_alpn_protocols( mbedtls_ssl_config *conf, const char **protos )
Manuel Pégourié-Gonnard7e250d42014-04-04 16:08:41 +02006258{
Manuel Pégourié-Gonnard0b874dc2014-04-07 10:57:45 +02006259 size_t cur_len, tot_len;
6260 const char **p;
6261
6262 /*
Brian J Murray1903fb32016-11-06 04:45:15 -08006263 * RFC 7301 3.1: "Empty strings MUST NOT be included and byte strings
6264 * MUST NOT be truncated."
6265 * We check lengths now rather than later.
Manuel Pégourié-Gonnard0b874dc2014-04-07 10:57:45 +02006266 */
6267 tot_len = 0;
6268 for( p = protos; *p != NULL; p++ )
6269 {
6270 cur_len = strlen( *p );
6271 tot_len += cur_len;
6272
6273 if( cur_len == 0 || cur_len > 255 || tot_len > 65535 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006274 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnard0b874dc2014-04-07 10:57:45 +02006275 }
6276
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006277 conf->alpn_list = protos;
Manuel Pégourié-Gonnard0b874dc2014-04-07 10:57:45 +02006278
6279 return( 0 );
Manuel Pégourié-Gonnard7e250d42014-04-04 16:08:41 +02006280}
6281
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006282const char *mbedtls_ssl_get_alpn_protocol( const mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard7e250d42014-04-04 16:08:41 +02006283{
Paul Bakkerd8bb8262014-06-17 14:06:49 +02006284 return( ssl->alpn_chosen );
Manuel Pégourié-Gonnard7e250d42014-04-04 16:08:41 +02006285}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006286#endif /* MBEDTLS_SSL_ALPN */
Manuel Pégourié-Gonnard7e250d42014-04-04 16:08:41 +02006287
Manuel Pégourié-Gonnard01e5e8c2015-05-11 10:11:56 +02006288void mbedtls_ssl_conf_max_version( mbedtls_ssl_config *conf, int major, int minor )
Paul Bakker490ecc82011-10-06 13:04:09 +00006289{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006290 conf->max_major_ver = major;
6291 conf->max_minor_ver = minor;
Paul Bakker490ecc82011-10-06 13:04:09 +00006292}
6293
Manuel Pégourié-Gonnard01e5e8c2015-05-11 10:11:56 +02006294void mbedtls_ssl_conf_min_version( mbedtls_ssl_config *conf, int major, int minor )
Paul Bakker1d29fb52012-09-28 13:28:45 +00006295{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006296 conf->min_major_ver = major;
6297 conf->min_minor_ver = minor;
Paul Bakker1d29fb52012-09-28 13:28:45 +00006298}
6299
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006300#if defined(MBEDTLS_SSL_FALLBACK_SCSV) && defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006301void mbedtls_ssl_conf_fallback( mbedtls_ssl_config *conf, char fallback )
Manuel Pégourié-Gonnard1cbd39d2014-10-20 13:34:59 +02006302{
Manuel Pégourié-Gonnard684b0592015-05-06 09:27:31 +01006303 conf->fallback = fallback;
Manuel Pégourié-Gonnard1cbd39d2014-10-20 13:34:59 +02006304}
6305#endif
6306
Janos Follath088ce432017-04-10 12:42:31 +01006307#if defined(MBEDTLS_SSL_SRV_C)
6308void mbedtls_ssl_conf_cert_req_ca_list( mbedtls_ssl_config *conf,
6309 char cert_req_ca_list )
6310{
6311 conf->cert_req_ca_list = cert_req_ca_list;
6312}
6313#endif
6314
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006315#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006316void mbedtls_ssl_conf_encrypt_then_mac( mbedtls_ssl_config *conf, char etm )
Manuel Pégourié-Gonnard699cafa2014-10-27 13:57:03 +01006317{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006318 conf->encrypt_then_mac = etm;
Manuel Pégourié-Gonnard699cafa2014-10-27 13:57:03 +01006319}
6320#endif
6321
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006322#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006323void mbedtls_ssl_conf_extended_master_secret( mbedtls_ssl_config *conf, char ems )
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +02006324{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006325 conf->extended_ms = ems;
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +02006326}
6327#endif
6328
Manuel Pégourié-Gonnard66dc5552015-05-14 12:28:21 +02006329#if defined(MBEDTLS_ARC4_C)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006330void mbedtls_ssl_conf_arc4_support( mbedtls_ssl_config *conf, char arc4 )
Manuel Pégourié-Gonnardbd47a582015-01-12 13:43:29 +01006331{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006332 conf->arc4_disabled = arc4;
Manuel Pégourié-Gonnardbd47a582015-01-12 13:43:29 +01006333}
Manuel Pégourié-Gonnard66dc5552015-05-14 12:28:21 +02006334#endif
Manuel Pégourié-Gonnardbd47a582015-01-12 13:43:29 +01006335
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006336#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006337int mbedtls_ssl_conf_max_frag_len( mbedtls_ssl_config *conf, unsigned char mfl_code )
Manuel Pégourié-Gonnard8b464592013-07-16 12:45:26 +02006338{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006339 if( mfl_code >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID ||
6340 mfl_code_to_length[mfl_code] > MBEDTLS_SSL_MAX_CONTENT_LEN )
Manuel Pégourié-Gonnard8b464592013-07-16 12:45:26 +02006341 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006342 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnard8b464592013-07-16 12:45:26 +02006343 }
6344
Manuel Pégourié-Gonnard6bf89d62015-05-05 17:01:57 +01006345 conf->mfl_code = mfl_code;
Manuel Pégourié-Gonnard8b464592013-07-16 12:45:26 +02006346
6347 return( 0 );
6348}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006349#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
Manuel Pégourié-Gonnard8b464592013-07-16 12:45:26 +02006350
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006351#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
Manuel Pégourié-Gonnard01e5e8c2015-05-11 10:11:56 +02006352void mbedtls_ssl_conf_truncated_hmac( mbedtls_ssl_config *conf, int truncate )
Manuel Pégourié-Gonnarde980a992013-07-19 11:08:52 +02006353{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006354 conf->trunc_hmac = truncate;
Manuel Pégourié-Gonnarde980a992013-07-19 11:08:52 +02006355}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006356#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
Manuel Pégourié-Gonnarde980a992013-07-19 11:08:52 +02006357
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006358#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006359void mbedtls_ssl_conf_cbc_record_splitting( mbedtls_ssl_config *conf, char split )
Manuel Pégourié-Gonnardcfa477e2015-01-07 14:50:54 +01006360{
Manuel Pégourié-Gonnard17eab2b2015-05-05 16:34:53 +01006361 conf->cbc_record_splitting = split;
Manuel Pégourié-Gonnardcfa477e2015-01-07 14:50:54 +01006362}
6363#endif
6364
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006365void mbedtls_ssl_conf_legacy_renegotiation( mbedtls_ssl_config *conf, int allow_legacy )
Paul Bakker48916f92012-09-16 19:57:18 +00006366{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006367 conf->allow_legacy_renegotiation = allow_legacy;
Paul Bakker48916f92012-09-16 19:57:18 +00006368}
6369
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006370#if defined(MBEDTLS_SSL_RENEGOTIATION)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006371void mbedtls_ssl_conf_renegotiation( mbedtls_ssl_config *conf, int renegotiation )
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01006372{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006373 conf->disable_renegotiation = renegotiation;
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01006374}
6375
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006376void mbedtls_ssl_conf_renegotiation_enforced( mbedtls_ssl_config *conf, int max_records )
Manuel Pégourié-Gonnarda9964db2014-07-03 19:29:16 +02006377{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006378 conf->renego_max_records = max_records;
Manuel Pégourié-Gonnarda9964db2014-07-03 19:29:16 +02006379}
6380
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006381void mbedtls_ssl_conf_renegotiation_period( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnard837f0fe2014-11-05 13:58:53 +01006382 const unsigned char period[8] )
6383{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006384 memcpy( conf->renego_period, period, 8 );
Manuel Pégourié-Gonnard837f0fe2014-11-05 13:58:53 +01006385}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006386#endif /* MBEDTLS_SSL_RENEGOTIATION */
Paul Bakker5121ce52009-01-03 21:22:43 +00006387
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006388#if defined(MBEDTLS_SSL_SESSION_TICKETS)
Manuel Pégourié-Gonnardb596abf2015-05-20 10:45:29 +02006389#if defined(MBEDTLS_SSL_CLI_C)
6390void mbedtls_ssl_conf_session_tickets( mbedtls_ssl_config *conf, int use_tickets )
Manuel Pégourié-Gonnardaa0d4d12013-08-03 13:02:31 +02006391{
Manuel Pégourié-Gonnard2b494452015-05-06 10:05:11 +01006392 conf->session_tickets = use_tickets;
Manuel Pégourié-Gonnardaa0d4d12013-08-03 13:02:31 +02006393}
Manuel Pégourié-Gonnardb596abf2015-05-20 10:45:29 +02006394#endif
Paul Bakker606b4ba2013-08-14 16:52:14 +02006395
Manuel Pégourié-Gonnardb596abf2015-05-20 10:45:29 +02006396#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +02006397void mbedtls_ssl_conf_session_tickets_cb( mbedtls_ssl_config *conf,
6398 mbedtls_ssl_ticket_write_t *f_ticket_write,
6399 mbedtls_ssl_ticket_parse_t *f_ticket_parse,
6400 void *p_ticket )
Paul Bakker606b4ba2013-08-14 16:52:14 +02006401{
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +02006402 conf->f_ticket_write = f_ticket_write;
6403 conf->f_ticket_parse = f_ticket_parse;
6404 conf->p_ticket = p_ticket;
Paul Bakker606b4ba2013-08-14 16:52:14 +02006405}
Manuel Pégourié-Gonnardb596abf2015-05-20 10:45:29 +02006406#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006407#endif /* MBEDTLS_SSL_SESSION_TICKETS */
Manuel Pégourié-Gonnardaa0d4d12013-08-03 13:02:31 +02006408
Robert Cragie4feb7ae2015-10-02 13:33:37 +01006409#if defined(MBEDTLS_SSL_EXPORT_KEYS)
6410void mbedtls_ssl_conf_export_keys_cb( mbedtls_ssl_config *conf,
6411 mbedtls_ssl_export_keys_t *f_export_keys,
6412 void *p_export_keys )
6413{
6414 conf->f_export_keys = f_export_keys;
6415 conf->p_export_keys = p_export_keys;
6416}
6417#endif
6418
Paul Bakker5121ce52009-01-03 21:22:43 +00006419/*
6420 * SSL get accessors
6421 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006422size_t mbedtls_ssl_get_bytes_avail( const mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00006423{
6424 return( ssl->in_offt == NULL ? 0 : ssl->in_msglen );
6425}
6426
Manuel Pégourié-Gonnarde6ef16f2015-05-11 19:54:43 +02006427uint32_t mbedtls_ssl_get_verify_result( const mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00006428{
Manuel Pégourié-Gonnarde89163c2015-01-23 14:30:57 +00006429 if( ssl->session != NULL )
6430 return( ssl->session->verify_result );
6431
6432 if( ssl->session_negotiate != NULL )
6433 return( ssl->session_negotiate->verify_result );
6434
Manuel Pégourié-Gonnard6ab9b002015-05-14 11:25:04 +02006435 return( 0xFFFFFFFF );
Paul Bakker5121ce52009-01-03 21:22:43 +00006436}
6437
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006438const char *mbedtls_ssl_get_ciphersuite( const mbedtls_ssl_context *ssl )
Paul Bakker72f62662011-01-16 21:27:44 +00006439{
Paul Bakker926c8e42013-03-06 10:23:34 +01006440 if( ssl == NULL || ssl->session == NULL )
Paul Bakkerd8bb8262014-06-17 14:06:49 +02006441 return( NULL );
Paul Bakker926c8e42013-03-06 10:23:34 +01006442
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006443 return mbedtls_ssl_get_ciphersuite_name( ssl->session->ciphersuite );
Paul Bakker72f62662011-01-16 21:27:44 +00006444}
6445
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006446const char *mbedtls_ssl_get_version( const mbedtls_ssl_context *ssl )
Paul Bakker43ca69c2011-01-15 17:35:19 +00006447{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006448#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006449 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnardb21ca2a2014-02-10 13:43:33 +01006450 {
6451 switch( ssl->minor_ver )
6452 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006453 case MBEDTLS_SSL_MINOR_VERSION_2:
Manuel Pégourié-Gonnardb21ca2a2014-02-10 13:43:33 +01006454 return( "DTLSv1.0" );
6455
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006456 case MBEDTLS_SSL_MINOR_VERSION_3:
Manuel Pégourié-Gonnardb21ca2a2014-02-10 13:43:33 +01006457 return( "DTLSv1.2" );
6458
6459 default:
6460 return( "unknown (DTLS)" );
6461 }
6462 }
6463#endif
6464
Paul Bakker43ca69c2011-01-15 17:35:19 +00006465 switch( ssl->minor_ver )
6466 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006467 case MBEDTLS_SSL_MINOR_VERSION_0:
Paul Bakker43ca69c2011-01-15 17:35:19 +00006468 return( "SSLv3.0" );
6469
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006470 case MBEDTLS_SSL_MINOR_VERSION_1:
Paul Bakker43ca69c2011-01-15 17:35:19 +00006471 return( "TLSv1.0" );
6472
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006473 case MBEDTLS_SSL_MINOR_VERSION_2:
Paul Bakker43ca69c2011-01-15 17:35:19 +00006474 return( "TLSv1.1" );
6475
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006476 case MBEDTLS_SSL_MINOR_VERSION_3:
Paul Bakker1ef83d62012-04-11 12:09:53 +00006477 return( "TLSv1.2" );
6478
Paul Bakker43ca69c2011-01-15 17:35:19 +00006479 default:
Manuel Pégourié-Gonnardb21ca2a2014-02-10 13:43:33 +01006480 return( "unknown" );
Paul Bakker43ca69c2011-01-15 17:35:19 +00006481 }
Paul Bakker43ca69c2011-01-15 17:35:19 +00006482}
6483
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006484int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006485{
Manuel Pégourié-Gonnard9de64f52015-07-01 15:51:43 +02006486 size_t transform_expansion;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006487 const mbedtls_ssl_transform *transform = ssl->transform_out;
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006488
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006489#if defined(MBEDTLS_ZLIB_SUPPORT)
6490 if( ssl->session_out->compression != MBEDTLS_SSL_COMPRESS_NULL )
6491 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006492#endif
6493
6494 if( transform == NULL )
Manuel Pégourié-Gonnard9de64f52015-07-01 15:51:43 +02006495 return( (int) mbedtls_ssl_hdr_len( ssl ) );
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006496
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006497 switch( mbedtls_cipher_get_cipher_mode( &transform->cipher_ctx_enc ) )
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006498 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006499 case MBEDTLS_MODE_GCM:
6500 case MBEDTLS_MODE_CCM:
6501 case MBEDTLS_MODE_STREAM:
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006502 transform_expansion = transform->minlen;
6503 break;
6504
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006505 case MBEDTLS_MODE_CBC:
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006506 transform_expansion = transform->maclen
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006507 + mbedtls_cipher_get_block_size( &transform->cipher_ctx_enc );
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006508 break;
6509
6510 default:
Manuel Pégourié-Gonnardcb0d2122015-07-22 11:52:11 +02006511 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006512 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006513 }
6514
Manuel Pégourié-Gonnard9de64f52015-07-01 15:51:43 +02006515 return( (int)( mbedtls_ssl_hdr_len( ssl ) + transform_expansion ) );
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006516}
6517
Manuel Pégourié-Gonnarda2cda6b2015-08-31 18:30:52 +02006518#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
6519size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl )
6520{
6521 size_t max_len;
6522
6523 /*
6524 * Assume mfl_code is correct since it was checked when set
6525 */
6526 max_len = mfl_code_to_length[ssl->conf->mfl_code];
6527
6528 /*
6529 * Check if a smaller max length was negotiated
6530 */
6531 if( ssl->session_out != NULL &&
6532 mfl_code_to_length[ssl->session_out->mfl_code] < max_len )
6533 {
6534 max_len = mfl_code_to_length[ssl->session_out->mfl_code];
6535 }
6536
6537 return max_len;
6538}
6539#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
6540
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006541#if defined(MBEDTLS_X509_CRT_PARSE_C)
6542const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert( const mbedtls_ssl_context *ssl )
Paul Bakkerb0550d92012-10-30 07:51:03 +00006543{
6544 if( ssl == NULL || ssl->session == NULL )
Paul Bakkerd8bb8262014-06-17 14:06:49 +02006545 return( NULL );
Paul Bakkerb0550d92012-10-30 07:51:03 +00006546
Paul Bakkerd8bb8262014-06-17 14:06:49 +02006547 return( ssl->session->peer_cert );
Paul Bakkerb0550d92012-10-30 07:51:03 +00006548}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006549#endif /* MBEDTLS_X509_CRT_PARSE_C */
Paul Bakkerb0550d92012-10-30 07:51:03 +00006550
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006551#if defined(MBEDTLS_SSL_CLI_C)
6552int mbedtls_ssl_get_session( const mbedtls_ssl_context *ssl, mbedtls_ssl_session *dst )
Manuel Pégourié-Gonnard74718032013-07-30 12:41:56 +02006553{
Manuel Pégourié-Gonnard74718032013-07-30 12:41:56 +02006554 if( ssl == NULL ||
6555 dst == NULL ||
6556 ssl->session == NULL ||
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006557 ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT )
Manuel Pégourié-Gonnard74718032013-07-30 12:41:56 +02006558 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006559 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnard74718032013-07-30 12:41:56 +02006560 }
6561
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +02006562 return( ssl_session_copy( dst, ssl->session ) );
Manuel Pégourié-Gonnard74718032013-07-30 12:41:56 +02006563}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006564#endif /* MBEDTLS_SSL_CLI_C */
Manuel Pégourié-Gonnard74718032013-07-30 12:41:56 +02006565
Paul Bakker5121ce52009-01-03 21:22:43 +00006566/*
Paul Bakker1961b702013-01-25 14:49:24 +01006567 * Perform a single step of the SSL handshake
Paul Bakker5121ce52009-01-03 21:22:43 +00006568 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006569int mbedtls_ssl_handshake_step( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00006570{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006571 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
Paul Bakker5121ce52009-01-03 21:22:43 +00006572
Manuel Pégourié-Gonnardf81ee2e2015-09-01 17:43:40 +02006573 if( ssl == NULL || ssl->conf == NULL )
6574 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6575
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006576#if defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006577 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006578 ret = mbedtls_ssl_handshake_client_step( ssl );
Paul Bakker5121ce52009-01-03 21:22:43 +00006579#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006580#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006581 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006582 ret = mbedtls_ssl_handshake_server_step( ssl );
Paul Bakker5121ce52009-01-03 21:22:43 +00006583#endif
6584
Paul Bakker1961b702013-01-25 14:49:24 +01006585 return( ret );
6586}
6587
6588/*
6589 * Perform the SSL handshake
6590 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006591int mbedtls_ssl_handshake( mbedtls_ssl_context *ssl )
Paul Bakker1961b702013-01-25 14:49:24 +01006592{
6593 int ret = 0;
6594
Manuel Pégourié-Gonnardf81ee2e2015-09-01 17:43:40 +02006595 if( ssl == NULL || ssl->conf == NULL )
6596 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6597
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006598 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> handshake" ) );
Paul Bakker1961b702013-01-25 14:49:24 +01006599
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006600 while( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
Paul Bakker1961b702013-01-25 14:49:24 +01006601 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006602 ret = mbedtls_ssl_handshake_step( ssl );
Paul Bakker1961b702013-01-25 14:49:24 +01006603
6604 if( ret != 0 )
6605 break;
6606 }
6607
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006608 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= handshake" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00006609
6610 return( ret );
6611}
6612
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006613#if defined(MBEDTLS_SSL_RENEGOTIATION)
6614#if defined(MBEDTLS_SSL_SRV_C)
Paul Bakker5121ce52009-01-03 21:22:43 +00006615/*
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006616 * Write HelloRequest to request renegotiation on server
Paul Bakker48916f92012-09-16 19:57:18 +00006617 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006618static int ssl_write_hello_request( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006619{
6620 int ret;
6621
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006622 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello request" ) );
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006623
6624 ssl->out_msglen = 4;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006625 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
6626 ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_REQUEST;
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006627
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006628 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006629 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006630 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006631 return( ret );
6632 }
6633
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006634 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello request" ) );
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006635
6636 return( 0 );
6637}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006638#endif /* MBEDTLS_SSL_SRV_C */
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006639
6640/*
6641 * Actually renegotiate current connection, triggered by either:
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006642 * - any side: calling mbedtls_ssl_renegotiate(),
6643 * - client: receiving a HelloRequest during mbedtls_ssl_read(),
6644 * - server: receiving any handshake message on server during mbedtls_ssl_read() after
Manuel Pégourié-Gonnard55e4ff22014-08-19 11:16:35 +02006645 * the initial handshake is completed.
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006646 * If the handshake doesn't complete due to waiting for I/O, it will continue
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006647 * during the next calls to mbedtls_ssl_renegotiate() or mbedtls_ssl_read() respectively.
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006648 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006649static int ssl_start_renegotiation( mbedtls_ssl_context *ssl )
Paul Bakker48916f92012-09-16 19:57:18 +00006650{
6651 int ret;
6652
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006653 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> renegotiate" ) );
Paul Bakker48916f92012-09-16 19:57:18 +00006654
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006655 if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
6656 return( ret );
Paul Bakker48916f92012-09-16 19:57:18 +00006657
Manuel Pégourié-Gonnard0557bd52014-08-19 19:18:39 +02006658 /* RFC 6347 4.2.2: "[...] the HelloRequest will have message_seq = 0 and
6659 * the ServerHello will have message_seq = 1" */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006660#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006661 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006662 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
Manuel Pégourié-Gonnard0557bd52014-08-19 19:18:39 +02006663 {
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006664 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02006665 ssl->handshake->out_msg_seq = 1;
6666 else
6667 ssl->handshake->in_msg_seq = 1;
Manuel Pégourié-Gonnard0557bd52014-08-19 19:18:39 +02006668 }
6669#endif
6670
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006671 ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
6672 ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS;
Paul Bakker48916f92012-09-16 19:57:18 +00006673
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006674 if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
Paul Bakker48916f92012-09-16 19:57:18 +00006675 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006676 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
Paul Bakker48916f92012-09-16 19:57:18 +00006677 return( ret );
6678 }
6679
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006680 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= renegotiate" ) );
Paul Bakker48916f92012-09-16 19:57:18 +00006681
6682 return( 0 );
6683}
6684
6685/*
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006686 * Renegotiate current connection on client,
6687 * or request renegotiation on server
6688 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006689int mbedtls_ssl_renegotiate( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006690{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006691 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006692
Manuel Pégourié-Gonnardf81ee2e2015-09-01 17:43:40 +02006693 if( ssl == NULL || ssl->conf == NULL )
6694 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6695
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006696#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006697 /* On server, just send the request */
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006698 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006699 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006700 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
6701 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006702
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006703 ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING;
Manuel Pégourié-Gonnardf07f4212014-08-15 19:04:47 +02006704
6705 /* Did we already try/start sending HelloRequest? */
6706 if( ssl->out_left != 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006707 return( mbedtls_ssl_flush_output( ssl ) );
Manuel Pégourié-Gonnardf07f4212014-08-15 19:04:47 +02006708
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006709 return( ssl_write_hello_request( ssl ) );
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006710 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006711#endif /* MBEDTLS_SSL_SRV_C */
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006712
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006713#if defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006714 /*
6715 * On client, either start the renegotiation process or,
6716 * if already in progress, continue the handshake
6717 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006718 if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006719 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006720 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
6721 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006722
6723 if( ( ret = ssl_start_renegotiation( ssl ) ) != 0 )
6724 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006725 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret );
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006726 return( ret );
6727 }
6728 }
6729 else
6730 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006731 if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006732 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006733 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006734 return( ret );
6735 }
6736 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006737#endif /* MBEDTLS_SSL_CLI_C */
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006738
Paul Bakker37ce0ff2013-10-31 14:32:04 +01006739 return( ret );
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006740}
6741
6742/*
Manuel Pégourié-Gonnardb4458052014-11-04 21:04:22 +01006743 * Check record counters and renegotiate if they're above the limit.
6744 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006745static int ssl_check_ctr_renegotiate( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnardb4458052014-11-04 21:04:22 +01006746{
Andres AG2196c7f2016-12-15 17:01:16 +00006747 size_t ep_len = ssl_ep_len( ssl );
6748 int in_ctr_cmp;
6749 int out_ctr_cmp;
6750
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006751 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ||
6752 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ||
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006753 ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED )
Manuel Pégourié-Gonnardb4458052014-11-04 21:04:22 +01006754 {
6755 return( 0 );
6756 }
6757
Andres AG2196c7f2016-12-15 17:01:16 +00006758 in_ctr_cmp = memcmp( ssl->in_ctr + ep_len,
6759 ssl->conf->renego_period + ep_len, 8 - ep_len );
6760 out_ctr_cmp = memcmp( ssl->out_ctr + ep_len,
6761 ssl->conf->renego_period + ep_len, 8 - ep_len );
6762
6763 if( in_ctr_cmp <= 0 && out_ctr_cmp <= 0 )
Manuel Pégourié-Gonnardb4458052014-11-04 21:04:22 +01006764 {
6765 return( 0 );
6766 }
6767
Manuel Pégourié-Gonnardcb0d2122015-07-22 11:52:11 +02006768 MBEDTLS_SSL_DEBUG_MSG( 1, ( "record counter limit reached: renegotiate" ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006769 return( mbedtls_ssl_renegotiate( ssl ) );
Manuel Pégourié-Gonnardb4458052014-11-04 21:04:22 +01006770}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006771#endif /* MBEDTLS_SSL_RENEGOTIATION */
Paul Bakker5121ce52009-01-03 21:22:43 +00006772
6773/*
6774 * Receive application data decrypted from the SSL layer
6775 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006776int mbedtls_ssl_read( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
Paul Bakker5121ce52009-01-03 21:22:43 +00006777{
Hanno Becker4a810fb2017-05-24 16:27:30 +01006778 int ret;
Paul Bakker23986e52011-04-24 08:57:21 +00006779 size_t n;
Paul Bakker5121ce52009-01-03 21:22:43 +00006780
Manuel Pégourié-Gonnardf81ee2e2015-09-01 17:43:40 +02006781 if( ssl == NULL || ssl->conf == NULL )
6782 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6783
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006784 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00006785
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006786#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006787 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02006788 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006789 if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02006790 return( ret );
6791
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02006792 if( ssl->handshake != NULL &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006793 ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02006794 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006795 if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02006796 return( ret );
6797 }
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02006798 }
6799#endif
6800
Hanno Becker4a810fb2017-05-24 16:27:30 +01006801 /*
6802 * Check if renegotiation is necessary and/or handshake is
6803 * in process. If yes, perform/continue, and fall through
6804 * if an unexpected packet is received while the client
6805 * is waiting for the ServerHello.
6806 *
6807 * (There is no equivalent to the last condition on
6808 * the server-side as it is not treated as within
6809 * a handshake while waiting for the ClientHello
6810 * after a renegotiation request.)
6811 */
6812
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006813#if defined(MBEDTLS_SSL_RENEGOTIATION)
Hanno Becker4a810fb2017-05-24 16:27:30 +01006814 ret = ssl_check_ctr_renegotiate( ssl );
6815 if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO &&
6816 ret != 0 )
Manuel Pégourié-Gonnardb4458052014-11-04 21:04:22 +01006817 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006818 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret );
Manuel Pégourié-Gonnardb4458052014-11-04 21:04:22 +01006819 return( ret );
6820 }
6821#endif
6822
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006823 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
Paul Bakker5121ce52009-01-03 21:22:43 +00006824 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006825 ret = mbedtls_ssl_handshake( ssl );
Hanno Becker4a810fb2017-05-24 16:27:30 +01006826 if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO &&
6827 ret != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00006828 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006829 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00006830 return( ret );
6831 }
6832 }
6833
Hanno Beckerbdf39052017-06-09 10:42:03 +01006834 /*
6835 * TODO
6836 *
6837 * The logic should be streamlined here:
6838 *
6839 * Instead of
6840 *
6841 * - Manually checking whether ssl->in_offt is NULL
6842 * - Fetching a new record if yes
6843 * - Setting ssl->in_offt if one finds an application record
6844 * - Resetting keep_current_message after handling the application data
6845 *
6846 * one should
6847 *
6848 * - Adapt read_record to set ssl->in_offt automatically
6849 * when a new application data record is processed.
6850 * - Always call mbedtls_ssl_read_record here.
6851 *
6852 * This way, the logic of ssl_read would be much clearer:
6853 *
6854 * (1) Always call record layer and see what kind of record is on
6855 * and have it ready for consumption (in particular, in_offt
6856 * properly set for application data records).
6857 * (2) If it's application data (either freshly fetched
6858 * or something already being partially processed),
6859 * serve the read request from it.
6860 * (3) If it's something different from application data,
6861 * handle it accordingly, e.g. potentially start a
6862 * renegotiation.
6863 *
6864 * This will also remove the need to manually reset
6865 * ssl->keep_current_message = 0 below.
6866 *
6867 */
6868
Paul Bakker5121ce52009-01-03 21:22:43 +00006869 if( ssl->in_offt == NULL )
6870 {
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02006871 /* Start timer if not already running */
Manuel Pégourié-Gonnard545102e2015-05-13 17:28:43 +02006872 if( ssl->f_get_timer != NULL &&
6873 ssl->f_get_timer( ssl->p_timer ) == -1 )
6874 {
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006875 ssl_set_timer( ssl, ssl->conf->read_timeout );
Manuel Pégourié-Gonnard545102e2015-05-13 17:28:43 +02006876 }
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02006877
Hanno Becker4a810fb2017-05-24 16:27:30 +01006878 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00006879 {
Hanno Becker4a810fb2017-05-24 16:27:30 +01006880 if( ret == MBEDTLS_ERR_SSL_CONN_EOF )
6881 return( 0 );
Paul Bakker831a7552011-05-18 13:32:51 +00006882
Hanno Becker4a810fb2017-05-24 16:27:30 +01006883 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
6884 return( ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00006885 }
6886
6887 if( ssl->in_msglen == 0 &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006888 ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA )
Paul Bakker5121ce52009-01-03 21:22:43 +00006889 {
6890 /*
6891 * OpenSSL sends empty messages to randomize the IV
6892 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006893 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00006894 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006895 if( ret == MBEDTLS_ERR_SSL_CONN_EOF )
Paul Bakker831a7552011-05-18 13:32:51 +00006896 return( 0 );
6897
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006898 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00006899 return( ret );
6900 }
6901 }
6902
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006903 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
Paul Bakker48916f92012-09-16 19:57:18 +00006904 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006905 MBEDTLS_SSL_DEBUG_MSG( 1, ( "received handshake message" ) );
Paul Bakker48916f92012-09-16 19:57:18 +00006906
Hanno Becker4a810fb2017-05-24 16:27:30 +01006907 /*
6908 * - For client-side, expect SERVER_HELLO_REQUEST.
6909 * - For server-side, expect CLIENT_HELLO.
6910 * - Fail (TLS) or silently drop record (DTLS) in other cases.
6911 */
6912
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006913#if defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006914 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006915 ( ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_REQUEST ||
Hanno Becker4a810fb2017-05-24 16:27:30 +01006916 ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) ) )
Paul Bakker48916f92012-09-16 19:57:18 +00006917 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006918 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not HelloRequest)" ) );
Manuel Pégourié-Gonnard990f9e42014-09-06 12:27:02 +02006919
6920 /* With DTLS, drop the packet (probably from last handshake) */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006921#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006922 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01006923 return( MBEDTLS_ERR_SSL_WANT_READ );
Manuel Pégourié-Gonnard990f9e42014-09-06 12:27:02 +02006924#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006925 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Manuel Pégourié-Gonnard990f9e42014-09-06 12:27:02 +02006926 }
Hanno Becker4a810fb2017-05-24 16:27:30 +01006927#endif /* MBEDTLS_SSL_CLI_C */
Manuel Pégourié-Gonnard990f9e42014-09-06 12:27:02 +02006928
Hanno Becker4a810fb2017-05-24 16:27:30 +01006929#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006930 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006931 ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_HELLO )
Manuel Pégourié-Gonnard990f9e42014-09-06 12:27:02 +02006932 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006933 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not ClientHello)" ) );
Manuel Pégourié-Gonnard990f9e42014-09-06 12:27:02 +02006934
6935 /* With DTLS, drop the packet (probably from last handshake) */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006936#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006937 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01006938 return( MBEDTLS_ERR_SSL_WANT_READ );
Manuel Pégourié-Gonnard990f9e42014-09-06 12:27:02 +02006939#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006940 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Paul Bakker48916f92012-09-16 19:57:18 +00006941 }
Hanno Becker4a810fb2017-05-24 16:27:30 +01006942#endif /* MBEDTLS_SSL_SRV_C */
6943
Hanno Becker21df7f92017-10-17 11:03:26 +01006944#if defined(MBEDTLS_SSL_RENEGOTIATION)
Hanno Becker4a810fb2017-05-24 16:27:30 +01006945 /* Determine whether renegotiation attempt should be accepted */
Hanno Beckerb4ff0aa2017-10-17 11:03:04 +01006946 if( ! ( ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED ||
6947 ( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
6948 ssl->conf->allow_legacy_renegotiation ==
6949 MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION ) ) )
6950 {
6951 /*
6952 * Accept renegotiation request
6953 */
Paul Bakker48916f92012-09-16 19:57:18 +00006954
Hanno Beckerb4ff0aa2017-10-17 11:03:04 +01006955 /* DTLS clients need to know renego is server-initiated */
6956#if defined(MBEDTLS_SSL_PROTO_DTLS)
6957 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
6958 ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
6959 {
6960 ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING;
6961 }
6962#endif
6963 ret = ssl_start_renegotiation( ssl );
6964 if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO &&
6965 ret != 0 )
6966 {
6967 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret );
6968 return( ret );
6969 }
6970 }
6971 else
Hanno Becker21df7f92017-10-17 11:03:26 +01006972#endif /* MBEDTLS_SSL_RENEGOTIATION */
Paul Bakker48916f92012-09-16 19:57:18 +00006973 {
Hanno Becker4a810fb2017-05-24 16:27:30 +01006974 /*
6975 * Refuse renegotiation
6976 */
6977
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006978 MBEDTLS_SSL_DEBUG_MSG( 3, ( "refusing renegotiation, sending alert" ) );
Paul Bakker48916f92012-09-16 19:57:18 +00006979
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006980#if defined(MBEDTLS_SSL_PROTO_SSL3)
6981 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Paul Bakker48916f92012-09-16 19:57:18 +00006982 {
Gilles Peskine92e44262017-05-10 17:27:49 +02006983 /* SSLv3 does not have a "no_renegotiation" warning, so
6984 we send a fatal alert and abort the connection. */
6985 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
6986 MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
6987 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00006988 }
6989 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006990#endif /* MBEDTLS_SSL_PROTO_SSL3 */
6991#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
6992 defined(MBEDTLS_SSL_PROTO_TLS1_2)
6993 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00006994 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006995 if( ( ret = mbedtls_ssl_send_alert_message( ssl,
6996 MBEDTLS_SSL_ALERT_LEVEL_WARNING,
6997 MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION ) ) != 0 )
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00006998 {
6999 return( ret );
7000 }
Paul Bakker48916f92012-09-16 19:57:18 +00007001 }
Paul Bakkerd2f068e2013-08-27 21:19:20 +02007002 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007003#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 ||
7004 MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker577e0062013-08-28 11:57:20 +02007005 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007006 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
7007 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakker577e0062013-08-28 11:57:20 +02007008 }
Paul Bakker48916f92012-09-16 19:57:18 +00007009 }
Manuel Pégourié-Gonnardf26a1e82014-08-19 12:28:50 +02007010
Hanno Becker4a810fb2017-05-24 16:27:30 +01007011 return( MBEDTLS_ERR_SSL_WANT_READ );
Paul Bakker48916f92012-09-16 19:57:18 +00007012 }
Hanno Becker21df7f92017-10-17 11:03:26 +01007013#if defined(MBEDTLS_SSL_RENEGOTIATION)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007014 else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
Manuel Pégourié-Gonnard6d8404d2013-10-30 16:41:45 +01007015 {
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02007016 if( ssl->conf->renego_max_records >= 0 )
Manuel Pégourié-Gonnarda9964db2014-07-03 19:29:16 +02007017 {
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02007018 if( ++ssl->renego_records_seen > ssl->conf->renego_max_records )
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02007019 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007020 MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation requested, "
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02007021 "but not honored by client" ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007022 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02007023 }
Manuel Pégourié-Gonnarda9964db2014-07-03 19:29:16 +02007024 }
Manuel Pégourié-Gonnard6d8404d2013-10-30 16:41:45 +01007025 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007026#endif /* MBEDTLS_SSL_RENEGOTIATION */
Manuel Pégourié-Gonnardf26a1e82014-08-19 12:28:50 +02007027
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007028 /* Fatal and closure alerts handled by mbedtls_ssl_read_record() */
7029 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT )
Manuel Pégourié-Gonnardf26a1e82014-08-19 12:28:50 +02007030 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007031 MBEDTLS_SSL_DEBUG_MSG( 2, ( "ignoring non-fatal non-closure alert" ) );
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01007032 return( MBEDTLS_ERR_SSL_WANT_READ );
Manuel Pégourié-Gonnardf26a1e82014-08-19 12:28:50 +02007033 }
7034
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007035 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA )
Paul Bakker5121ce52009-01-03 21:22:43 +00007036 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007037 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad application data message" ) );
7038 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Paul Bakker5121ce52009-01-03 21:22:43 +00007039 }
7040
7041 ssl->in_offt = ssl->in_msg;
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02007042
Manuel Pégourié-Gonnardba958b82014-10-09 16:13:44 +02007043 /* We're going to return something now, cancel timer,
7044 * except if handshake (renegotiation) is in progress */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007045 if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
Manuel Pégourié-Gonnardba958b82014-10-09 16:13:44 +02007046 ssl_set_timer( ssl, 0 );
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02007047
Manuel Pégourié-Gonnard286a1362015-05-13 16:22:05 +02007048#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02007049 /* If we requested renego but received AppData, resend HelloRequest.
7050 * Do it now, after setting in_offt, to avoid taking this branch
7051 * again if ssl_write_hello_request() returns WANT_WRITE */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007052#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02007053 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007054 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02007055 {
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02007056 if( ( ret = ssl_resend_hello_request( ssl ) ) != 0 )
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02007057 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007058 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_resend_hello_request", ret );
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02007059 return( ret );
7060 }
7061 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007062#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
Hanno Becker4a810fb2017-05-24 16:27:30 +01007063#endif /* MBEDTLS_SSL_PROTO_DTLS */
Paul Bakker5121ce52009-01-03 21:22:43 +00007064 }
7065
7066 n = ( len < ssl->in_msglen )
7067 ? len : ssl->in_msglen;
7068
7069 memcpy( buf, ssl->in_offt, n );
7070 ssl->in_msglen -= n;
7071
7072 if( ssl->in_msglen == 0 )
Hanno Becker4a810fb2017-05-24 16:27:30 +01007073 {
7074 /* all bytes consumed */
Paul Bakker5121ce52009-01-03 21:22:43 +00007075 ssl->in_offt = NULL;
Hanno Beckerbdf39052017-06-09 10:42:03 +01007076 ssl->keep_current_message = 0;
Hanno Becker4a810fb2017-05-24 16:27:30 +01007077 }
Paul Bakker5121ce52009-01-03 21:22:43 +00007078 else
Hanno Becker4a810fb2017-05-24 16:27:30 +01007079 {
Paul Bakker5121ce52009-01-03 21:22:43 +00007080 /* more data available */
7081 ssl->in_offt += n;
Hanno Becker4a810fb2017-05-24 16:27:30 +01007082 }
Paul Bakker5121ce52009-01-03 21:22:43 +00007083
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007084 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00007085
Paul Bakker23986e52011-04-24 08:57:21 +00007086 return( (int) n );
Paul Bakker5121ce52009-01-03 21:22:43 +00007087}
7088
7089/*
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007090 * Send application data to be encrypted by the SSL layer,
7091 * taking care of max fragment length and buffer size
Paul Bakker5121ce52009-01-03 21:22:43 +00007092 */
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007093static int ssl_write_real( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007094 const unsigned char *buf, size_t len )
Paul Bakker5121ce52009-01-03 21:22:43 +00007095{
Paul Bakker23986e52011-04-24 08:57:21 +00007096 int ret;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007097#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
Manuel Pégourié-Gonnarda2cda6b2015-08-31 18:30:52 +02007098 size_t max_len = mbedtls_ssl_get_max_frag_len( ssl );
Florin0b7b83f2017-07-22 09:01:44 +02007099#else
7100 size_t max_len = MBEDTLS_SSL_MAX_CONTENT_LEN;
7101#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
Manuel Pégourié-Gonnard37e08e12014-10-13 17:55:52 +02007102 if( len > max_len )
7103 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007104#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02007105 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard37e08e12014-10-13 17:55:52 +02007106 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007107 MBEDTLS_SSL_DEBUG_MSG( 1, ( "fragment larger than the (negotiated) "
Manuel Pégourié-Gonnard37e08e12014-10-13 17:55:52 +02007108 "maximum fragment length: %d > %d",
7109 len, max_len ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007110 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnard37e08e12014-10-13 17:55:52 +02007111 }
7112 else
7113#endif
7114 len = max_len;
7115 }
Paul Bakker887bd502011-06-08 13:10:54 +00007116
Paul Bakker5121ce52009-01-03 21:22:43 +00007117 if( ssl->out_left != 0 )
7118 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007119 if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00007120 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007121 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00007122 return( ret );
7123 }
7124 }
Paul Bakker887bd502011-06-08 13:10:54 +00007125 else
Paul Bakker1fd00bf2011-03-14 20:50:15 +00007126 {
Manuel Pégourié-Gonnard37e08e12014-10-13 17:55:52 +02007127 ssl->out_msglen = len;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007128 ssl->out_msgtype = MBEDTLS_SSL_MSG_APPLICATION_DATA;
Manuel Pégourié-Gonnard37e08e12014-10-13 17:55:52 +02007129 memcpy( ssl->out_msg, buf, len );
Paul Bakker887bd502011-06-08 13:10:54 +00007130
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007131 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
Paul Bakker887bd502011-06-08 13:10:54 +00007132 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007133 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
Paul Bakker887bd502011-06-08 13:10:54 +00007134 return( ret );
7135 }
Paul Bakker5121ce52009-01-03 21:22:43 +00007136 }
7137
Manuel Pégourié-Gonnard37e08e12014-10-13 17:55:52 +02007138 return( (int) len );
Paul Bakker5121ce52009-01-03 21:22:43 +00007139}
7140
7141/*
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01007142 * Write application data, doing 1/n-1 splitting if necessary.
7143 *
7144 * With non-blocking I/O, ssl_write_real() may return WANT_WRITE,
Manuel Pégourié-Gonnardcfa477e2015-01-07 14:50:54 +01007145 * then the caller will call us again with the same arguments, so
Hanno Becker2b187c42017-09-18 14:58:11 +01007146 * remember whether we already did the split or not.
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01007147 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007148#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007149static int ssl_write_split( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007150 const unsigned char *buf, size_t len )
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01007151{
7152 int ret;
7153
Manuel Pégourié-Gonnard17eab2b2015-05-05 16:34:53 +01007154 if( ssl->conf->cbc_record_splitting ==
7155 MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED ||
Manuel Pégourié-Gonnardcfa477e2015-01-07 14:50:54 +01007156 len <= 1 ||
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007157 ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_1 ||
7158 mbedtls_cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc )
7159 != MBEDTLS_MODE_CBC )
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01007160 {
7161 return( ssl_write_real( ssl, buf, len ) );
7162 }
7163
7164 if( ssl->split_done == 0 )
7165 {
Manuel Pégourié-Gonnarda852cf42015-01-13 20:56:15 +01007166 if( ( ret = ssl_write_real( ssl, buf, 1 ) ) <= 0 )
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01007167 return( ret );
Manuel Pégourié-Gonnarda852cf42015-01-13 20:56:15 +01007168 ssl->split_done = 1;
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01007169 }
7170
Manuel Pégourié-Gonnarda852cf42015-01-13 20:56:15 +01007171 if( ( ret = ssl_write_real( ssl, buf + 1, len - 1 ) ) <= 0 )
7172 return( ret );
7173 ssl->split_done = 0;
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01007174
7175 return( ret + 1 );
7176}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007177#endif /* MBEDTLS_SSL_CBC_RECORD_SPLITTING */
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01007178
7179/*
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007180 * Write application data (public-facing wrapper)
7181 */
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007182int mbedtls_ssl_write( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len )
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007183{
7184 int ret;
7185
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007186 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write" ) );
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007187
Manuel Pégourié-Gonnardf81ee2e2015-09-01 17:43:40 +02007188 if( ssl == NULL || ssl->conf == NULL )
7189 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
7190
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007191#if defined(MBEDTLS_SSL_RENEGOTIATION)
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007192 if( ( ret = ssl_check_ctr_renegotiate( ssl ) ) != 0 )
7193 {
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007194 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret );
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007195 return( ret );
7196 }
7197#endif
7198
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007199 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007200 {
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007201 if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007202 {
Manuel Pégourié-Gonnard151dc772015-05-14 13:55:51 +02007203 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007204 return( ret );
7205 }
7206 }
7207
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007208#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007209 ret = ssl_write_split( ssl, buf, len );
7210#else
7211 ret = ssl_write_real( ssl, buf, len );
7212#endif
7213
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007214 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write" ) );
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007215
7216 return( ret );
7217}
7218
7219/*
Paul Bakker5121ce52009-01-03 21:22:43 +00007220 * Notify the peer that the connection is being closed
7221 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007222int mbedtls_ssl_close_notify( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00007223{
7224 int ret;
7225
Manuel Pégourié-Gonnardf81ee2e2015-09-01 17:43:40 +02007226 if( ssl == NULL || ssl->conf == NULL )
7227 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
7228
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007229 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write close notify" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00007230
Manuel Pégourié-Gonnarda13500f2014-08-19 16:14:04 +02007231 if( ssl->out_left != 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007232 return( mbedtls_ssl_flush_output( ssl ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00007233
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007234 if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
Paul Bakker5121ce52009-01-03 21:22:43 +00007235 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007236 if( ( ret = mbedtls_ssl_send_alert_message( ssl,
7237 MBEDTLS_SSL_ALERT_LEVEL_WARNING,
7238 MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00007239 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007240 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_send_alert_message", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00007241 return( ret );
7242 }
7243 }
7244
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007245 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write close notify" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00007246
Manuel Pégourié-Gonnarda13500f2014-08-19 16:14:04 +02007247 return( 0 );
Paul Bakker5121ce52009-01-03 21:22:43 +00007248}
7249
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007250void mbedtls_ssl_transform_free( mbedtls_ssl_transform *transform )
Paul Bakker48916f92012-09-16 19:57:18 +00007251{
Paul Bakkeraccaffe2014-06-26 13:37:14 +02007252 if( transform == NULL )
7253 return;
7254
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007255#if defined(MBEDTLS_ZLIB_SUPPORT)
Paul Bakker48916f92012-09-16 19:57:18 +00007256 deflateEnd( &transform->ctx_deflate );
7257 inflateEnd( &transform->ctx_inflate );
7258#endif
7259
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007260 mbedtls_cipher_free( &transform->cipher_ctx_enc );
7261 mbedtls_cipher_free( &transform->cipher_ctx_dec );
Manuel Pégourié-Gonnardf71e5872013-09-23 17:12:43 +02007262
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007263 mbedtls_md_free( &transform->md_ctx_enc );
7264 mbedtls_md_free( &transform->md_ctx_dec );
Paul Bakker61d113b2013-07-04 11:51:43 +02007265
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007266 mbedtls_zeroize( transform, sizeof( mbedtls_ssl_transform ) );
Paul Bakker48916f92012-09-16 19:57:18 +00007267}
7268
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007269#if defined(MBEDTLS_X509_CRT_PARSE_C)
7270static void ssl_key_cert_free( mbedtls_ssl_key_cert *key_cert )
Manuel Pégourié-Gonnard705fcca2013-09-23 20:04:20 +02007271{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007272 mbedtls_ssl_key_cert *cur = key_cert, *next;
Manuel Pégourié-Gonnard705fcca2013-09-23 20:04:20 +02007273
7274 while( cur != NULL )
7275 {
7276 next = cur->next;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007277 mbedtls_free( cur );
Manuel Pégourié-Gonnard705fcca2013-09-23 20:04:20 +02007278 cur = next;
7279 }
7280}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007281#endif /* MBEDTLS_X509_CRT_PARSE_C */
Manuel Pégourié-Gonnard705fcca2013-09-23 20:04:20 +02007282
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007283void mbedtls_ssl_handshake_free( mbedtls_ssl_handshake_params *handshake )
Paul Bakker48916f92012-09-16 19:57:18 +00007284{
Paul Bakkeraccaffe2014-06-26 13:37:14 +02007285 if( handshake == NULL )
7286 return;
7287
Manuel Pégourié-Gonnardb9d64e52015-07-06 14:18:56 +02007288#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
7289 defined(MBEDTLS_SSL_PROTO_TLS1_1)
7290 mbedtls_md5_free( &handshake->fin_md5 );
7291 mbedtls_sha1_free( &handshake->fin_sha1 );
7292#endif
7293#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
7294#if defined(MBEDTLS_SHA256_C)
7295 mbedtls_sha256_free( &handshake->fin_sha256 );
7296#endif
7297#if defined(MBEDTLS_SHA512_C)
7298 mbedtls_sha512_free( &handshake->fin_sha512 );
7299#endif
7300#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
7301
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007302#if defined(MBEDTLS_DHM_C)
7303 mbedtls_dhm_free( &handshake->dhm_ctx );
Paul Bakker48916f92012-09-16 19:57:18 +00007304#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007305#if defined(MBEDTLS_ECDH_C)
7306 mbedtls_ecdh_free( &handshake->ecdh_ctx );
Paul Bakker61d113b2013-07-04 11:51:43 +02007307#endif
Manuel Pégourié-Gonnardeef142d2015-09-16 10:05:04 +02007308#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
Manuel Pégourié-Gonnard76cfd3f2015-09-15 12:10:54 +02007309 mbedtls_ecjpake_free( &handshake->ecjpake_ctx );
Manuel Pégourié-Gonnard77c06462015-09-17 13:59:49 +02007310#if defined(MBEDTLS_SSL_CLI_C)
7311 mbedtls_free( handshake->ecjpake_cache );
7312 handshake->ecjpake_cache = NULL;
7313 handshake->ecjpake_cache_len = 0;
7314#endif
Manuel Pégourié-Gonnard76cfd3f2015-09-15 12:10:54 +02007315#endif
Paul Bakker61d113b2013-07-04 11:51:43 +02007316
Janos Follath4ae5c292016-02-10 11:27:43 +00007317#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
7318 defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
Paul Bakker9af723c2014-05-01 13:03:14 +02007319 /* explicit void pointer cast for buggy MS compiler */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007320 mbedtls_free( (void *) handshake->curves );
Manuel Pégourié-Gonnardd09453c2013-09-23 19:11:32 +02007321#endif
7322
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01007323#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
7324 if( handshake->psk != NULL )
7325 {
7326 mbedtls_zeroize( handshake->psk, handshake->psk_len );
7327 mbedtls_free( handshake->psk );
7328 }
7329#endif
7330
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007331#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
7332 defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
Manuel Pégourié-Gonnard83724542013-09-24 22:30:56 +02007333 /*
7334 * Free only the linked list wrapper, not the keys themselves
7335 * since the belong to the SNI callback
7336 */
7337 if( handshake->sni_key_cert != NULL )
7338 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007339 mbedtls_ssl_key_cert *cur = handshake->sni_key_cert, *next;
Manuel Pégourié-Gonnard83724542013-09-24 22:30:56 +02007340
7341 while( cur != NULL )
7342 {
7343 next = cur->next;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007344 mbedtls_free( cur );
Manuel Pégourié-Gonnard83724542013-09-24 22:30:56 +02007345 cur = next;
7346 }
7347 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007348#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_SERVER_NAME_INDICATION */
Manuel Pégourié-Gonnard705fcca2013-09-23 20:04:20 +02007349
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007350#if defined(MBEDTLS_SSL_PROTO_DTLS)
7351 mbedtls_free( handshake->verify_cookie );
7352 mbedtls_free( handshake->hs_msg );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02007353 ssl_flight_free( handshake->flight );
Manuel Pégourié-Gonnard74848812014-07-11 02:43:49 +02007354#endif
7355
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007356 mbedtls_zeroize( handshake, sizeof( mbedtls_ssl_handshake_params ) );
Paul Bakker48916f92012-09-16 19:57:18 +00007357}
7358
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007359void mbedtls_ssl_session_free( mbedtls_ssl_session *session )
Paul Bakker48916f92012-09-16 19:57:18 +00007360{
Paul Bakkeraccaffe2014-06-26 13:37:14 +02007361 if( session == NULL )
7362 return;
7363
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007364#if defined(MBEDTLS_X509_CRT_PARSE_C)
Paul Bakker0a597072012-09-25 21:55:46 +00007365 if( session->peer_cert != NULL )
Paul Bakker48916f92012-09-16 19:57:18 +00007366 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007367 mbedtls_x509_crt_free( session->peer_cert );
7368 mbedtls_free( session->peer_cert );
Paul Bakker48916f92012-09-16 19:57:18 +00007369 }
Paul Bakkered27a042013-04-18 22:46:23 +02007370#endif
Paul Bakker0a597072012-09-25 21:55:46 +00007371
Manuel Pégourié-Gonnardb596abf2015-05-20 10:45:29 +02007372#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007373 mbedtls_free( session->ticket );
Paul Bakkera503a632013-08-14 13:48:06 +02007374#endif
Manuel Pégourié-Gonnard75d44012013-08-02 14:44:04 +02007375
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007376 mbedtls_zeroize( session, sizeof( mbedtls_ssl_session ) );
Paul Bakker48916f92012-09-16 19:57:18 +00007377}
7378
Paul Bakker5121ce52009-01-03 21:22:43 +00007379/*
7380 * Free an SSL context
7381 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007382void mbedtls_ssl_free( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00007383{
Paul Bakkeraccaffe2014-06-26 13:37:14 +02007384 if( ssl == NULL )
7385 return;
7386
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007387 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> free" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00007388
Manuel Pégourié-Gonnard7ee6f0e2014-02-13 10:54:07 +01007389 if( ssl->out_buf != NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00007390 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007391 mbedtls_zeroize( ssl->out_buf, MBEDTLS_SSL_BUFFER_LEN );
7392 mbedtls_free( ssl->out_buf );
Paul Bakker5121ce52009-01-03 21:22:43 +00007393 }
7394
Manuel Pégourié-Gonnard7ee6f0e2014-02-13 10:54:07 +01007395 if( ssl->in_buf != NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00007396 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007397 mbedtls_zeroize( ssl->in_buf, MBEDTLS_SSL_BUFFER_LEN );
7398 mbedtls_free( ssl->in_buf );
Paul Bakker5121ce52009-01-03 21:22:43 +00007399 }
7400
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007401#if defined(MBEDTLS_ZLIB_SUPPORT)
Paul Bakker16770332013-10-11 09:59:44 +02007402 if( ssl->compress_buf != NULL )
7403 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007404 mbedtls_zeroize( ssl->compress_buf, MBEDTLS_SSL_BUFFER_LEN );
7405 mbedtls_free( ssl->compress_buf );
Paul Bakker16770332013-10-11 09:59:44 +02007406 }
7407#endif
7408
Paul Bakker48916f92012-09-16 19:57:18 +00007409 if( ssl->transform )
7410 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007411 mbedtls_ssl_transform_free( ssl->transform );
7412 mbedtls_free( ssl->transform );
Paul Bakker48916f92012-09-16 19:57:18 +00007413 }
7414
7415 if( ssl->handshake )
7416 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007417 mbedtls_ssl_handshake_free( ssl->handshake );
7418 mbedtls_ssl_transform_free( ssl->transform_negotiate );
7419 mbedtls_ssl_session_free( ssl->session_negotiate );
Paul Bakker48916f92012-09-16 19:57:18 +00007420
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007421 mbedtls_free( ssl->handshake );
7422 mbedtls_free( ssl->transform_negotiate );
7423 mbedtls_free( ssl->session_negotiate );
Paul Bakker48916f92012-09-16 19:57:18 +00007424 }
7425
Paul Bakkerc0463502013-02-14 11:19:38 +01007426 if( ssl->session )
7427 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007428 mbedtls_ssl_session_free( ssl->session );
7429 mbedtls_free( ssl->session );
Paul Bakkerc0463502013-02-14 11:19:38 +01007430 }
7431
Manuel Pégourié-Gonnard55fab2d2015-05-11 16:15:19 +02007432#if defined(MBEDTLS_X509_CRT_PARSE_C)
Paul Bakker66d5d072014-06-17 16:39:18 +02007433 if( ssl->hostname != NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00007434 {
Manuel Pégourié-Gonnardba26c242015-05-06 10:47:06 +01007435 mbedtls_zeroize( ssl->hostname, strlen( ssl->hostname ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007436 mbedtls_free( ssl->hostname );
Paul Bakker5121ce52009-01-03 21:22:43 +00007437 }
Paul Bakker0be444a2013-08-27 21:55:01 +02007438#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00007439
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007440#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
7441 if( mbedtls_ssl_hw_record_finish != NULL )
Paul Bakker05ef8352012-05-08 09:17:57 +00007442 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007443 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_finish()" ) );
7444 mbedtls_ssl_hw_record_finish( ssl );
Paul Bakker05ef8352012-05-08 09:17:57 +00007445 }
7446#endif
7447
Manuel Pégourié-Gonnarde057d3b2015-05-20 10:59:43 +02007448#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007449 mbedtls_free( ssl->cli_id );
Manuel Pégourié-Gonnard43c02182014-07-22 17:32:01 +02007450#endif
7451
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007452 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= free" ) );
Paul Bakker2da561c2009-02-05 18:00:28 +00007453
Paul Bakker86f04f42013-02-14 11:20:09 +01007454 /* Actually clear after last debug message */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007455 mbedtls_zeroize( ssl, sizeof( mbedtls_ssl_context ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00007456}
7457
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007458/*
7459 * Initialze mbedtls_ssl_config
7460 */
7461void mbedtls_ssl_config_init( mbedtls_ssl_config *conf )
7462{
7463 memset( conf, 0, sizeof( mbedtls_ssl_config ) );
7464}
7465
Simon Butcherc97b6972015-12-27 23:48:17 +00007466#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
Manuel Pégourié-Gonnard47229c72015-12-04 15:02:56 +01007467static int ssl_preset_default_hashes[] = {
7468#if defined(MBEDTLS_SHA512_C)
7469 MBEDTLS_MD_SHA512,
7470 MBEDTLS_MD_SHA384,
7471#endif
7472#if defined(MBEDTLS_SHA256_C)
7473 MBEDTLS_MD_SHA256,
7474 MBEDTLS_MD_SHA224,
7475#endif
Gilles Peskine5d2511c2017-05-12 13:16:40 +02007476#if defined(MBEDTLS_SHA1_C) && defined(MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE)
Manuel Pégourié-Gonnard47229c72015-12-04 15:02:56 +01007477 MBEDTLS_MD_SHA1,
7478#endif
7479 MBEDTLS_MD_NONE
7480};
Simon Butcherc97b6972015-12-27 23:48:17 +00007481#endif
Manuel Pégourié-Gonnard47229c72015-12-04 15:02:56 +01007482
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007483static int ssl_preset_suiteb_ciphersuites[] = {
7484 MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
7485 MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
7486 0
7487};
7488
Manuel Pégourié-Gonnarde5f30722015-10-22 17:01:15 +02007489#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007490static int ssl_preset_suiteb_hashes[] = {
7491 MBEDTLS_MD_SHA256,
7492 MBEDTLS_MD_SHA384,
7493 MBEDTLS_MD_NONE
7494};
7495#endif
7496
7497#if defined(MBEDTLS_ECP_C)
7498static mbedtls_ecp_group_id ssl_preset_suiteb_curves[] = {
7499 MBEDTLS_ECP_DP_SECP256R1,
7500 MBEDTLS_ECP_DP_SECP384R1,
7501 MBEDTLS_ECP_DP_NONE
7502};
7503#endif
7504
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007505/*
Tillmann Karras588ad502015-09-25 04:27:22 +02007506 * Load default in mbedtls_ssl_config
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007507 */
Manuel Pégourié-Gonnard419d5ae2015-05-04 19:32:36 +02007508int mbedtls_ssl_config_defaults( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007509 int endpoint, int transport, int preset )
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007510{
Manuel Pégourié-Gonnard8b431fb2015-05-11 12:54:52 +02007511#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007512 int ret;
Manuel Pégourié-Gonnard8b431fb2015-05-11 12:54:52 +02007513#endif
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007514
Manuel Pégourié-Gonnard0de074f2015-05-14 12:58:01 +02007515 /* Use the functions here so that they are covered in tests,
7516 * but otherwise access member directly for efficiency */
7517 mbedtls_ssl_conf_endpoint( conf, endpoint );
7518 mbedtls_ssl_conf_transport( conf, transport );
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007519
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007520 /*
7521 * Things that are common to all presets
7522 */
Manuel Pégourié-Gonnard419d5ae2015-05-04 19:32:36 +02007523#if defined(MBEDTLS_SSL_CLI_C)
7524 if( endpoint == MBEDTLS_SSL_IS_CLIENT )
7525 {
7526 conf->authmode = MBEDTLS_SSL_VERIFY_REQUIRED;
7527#if defined(MBEDTLS_SSL_SESSION_TICKETS)
7528 conf->session_tickets = MBEDTLS_SSL_SESSION_TICKETS_ENABLED;
7529#endif
7530 }
7531#endif
7532
Manuel Pégourié-Gonnard66dc5552015-05-14 12:28:21 +02007533#if defined(MBEDTLS_ARC4_C)
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007534 conf->arc4_disabled = MBEDTLS_SSL_ARC4_DISABLED;
Manuel Pégourié-Gonnard66dc5552015-05-14 12:28:21 +02007535#endif
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007536
7537#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
7538 conf->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
7539#endif
7540
7541#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
7542 conf->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
7543#endif
7544
Manuel Pégourié-Gonnard17eab2b2015-05-05 16:34:53 +01007545#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
7546 conf->cbc_record_splitting = MBEDTLS_SSL_CBC_RECORD_SPLITTING_ENABLED;
7547#endif
7548
Manuel Pégourié-Gonnarde057d3b2015-05-20 10:59:43 +02007549#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007550 conf->f_cookie_write = ssl_cookie_write_dummy;
7551 conf->f_cookie_check = ssl_cookie_check_dummy;
7552#endif
7553
7554#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
7555 conf->anti_replay = MBEDTLS_SSL_ANTI_REPLAY_ENABLED;
7556#endif
7557
Janos Follath088ce432017-04-10 12:42:31 +01007558#if defined(MBEDTLS_SSL_SRV_C)
7559 conf->cert_req_ca_list = MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED;
7560#endif
7561
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007562#if defined(MBEDTLS_SSL_PROTO_DTLS)
7563 conf->hs_timeout_min = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MIN;
7564 conf->hs_timeout_max = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MAX;
7565#endif
7566
7567#if defined(MBEDTLS_SSL_RENEGOTIATION)
7568 conf->renego_max_records = MBEDTLS_SSL_RENEGO_MAX_RECORDS_DEFAULT;
Andres AG2196c7f2016-12-15 17:01:16 +00007569 memset( conf->renego_period, 0x00, 2 );
7570 memset( conf->renego_period + 2, 0xFF, 6 );
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007571#endif
7572
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007573#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
7574 if( endpoint == MBEDTLS_SSL_IS_SERVER )
7575 {
7576 if( ( ret = mbedtls_ssl_conf_dh_param( conf,
7577 MBEDTLS_DHM_RFC5114_MODP_2048_P,
7578 MBEDTLS_DHM_RFC5114_MODP_2048_G ) ) != 0 )
7579 {
7580 return( ret );
7581 }
7582 }
Manuel Pégourié-Gonnardbd990d62015-06-11 14:49:42 +02007583#endif
7584
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007585 /*
7586 * Preset-specific defaults
7587 */
7588 switch( preset )
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007589 {
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007590 /*
7591 * NSA Suite B
7592 */
7593 case MBEDTLS_SSL_PRESET_SUITEB:
7594 conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
7595 conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; /* TLS 1.2 */
7596 conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION;
7597 conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION;
7598
7599 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] =
7600 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] =
7601 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] =
7602 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] =
7603 ssl_preset_suiteb_ciphersuites;
7604
7605#if defined(MBEDTLS_X509_CRT_PARSE_C)
7606 conf->cert_profile = &mbedtls_x509_crt_profile_suiteb;
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007607#endif
7608
Manuel Pégourié-Gonnarde5f30722015-10-22 17:01:15 +02007609#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007610 conf->sig_hashes = ssl_preset_suiteb_hashes;
7611#endif
7612
7613#if defined(MBEDTLS_ECP_C)
7614 conf->curve_list = ssl_preset_suiteb_curves;
7615#endif
Manuel Pégourié-Gonnardc98204e2015-08-11 04:21:01 +02007616 break;
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007617
7618 /*
7619 * Default
7620 */
7621 default:
7622 conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
7623 conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_1; /* TLS 1.0 */
7624 conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION;
7625 conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION;
7626
7627#if defined(MBEDTLS_SSL_PROTO_DTLS)
7628 if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
7629 conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_2;
7630#endif
7631
7632 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] =
7633 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] =
7634 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] =
7635 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] =
7636 mbedtls_ssl_list_ciphersuites();
7637
7638#if defined(MBEDTLS_X509_CRT_PARSE_C)
7639 conf->cert_profile = &mbedtls_x509_crt_profile_default;
7640#endif
7641
Manuel Pégourié-Gonnarde5f30722015-10-22 17:01:15 +02007642#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
Manuel Pégourié-Gonnard47229c72015-12-04 15:02:56 +01007643 conf->sig_hashes = ssl_preset_default_hashes;
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007644#endif
7645
7646#if defined(MBEDTLS_ECP_C)
7647 conf->curve_list = mbedtls_ecp_grp_id_list();
7648#endif
7649
7650#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
7651 conf->dhm_min_bitlen = 1024;
7652#endif
7653 }
7654
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007655 return( 0 );
7656}
7657
7658/*
7659 * Free mbedtls_ssl_config
7660 */
7661void mbedtls_ssl_config_free( mbedtls_ssl_config *conf )
7662{
7663#if defined(MBEDTLS_DHM_C)
7664 mbedtls_mpi_free( &conf->dhm_P );
7665 mbedtls_mpi_free( &conf->dhm_G );
7666#endif
7667
7668#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
7669 if( conf->psk != NULL )
7670 {
7671 mbedtls_zeroize( conf->psk, conf->psk_len );
7672 mbedtls_zeroize( conf->psk_identity, conf->psk_identity_len );
7673 mbedtls_free( conf->psk );
7674 mbedtls_free( conf->psk_identity );
7675 conf->psk_len = 0;
7676 conf->psk_identity_len = 0;
7677 }
7678#endif
7679
7680#if defined(MBEDTLS_X509_CRT_PARSE_C)
7681 ssl_key_cert_free( conf->key_cert );
7682#endif
7683
7684 mbedtls_zeroize( conf, sizeof( mbedtls_ssl_config ) );
7685}
7686
Manuel Pégourié-Gonnard5674a972015-10-19 15:14:03 +02007687#if defined(MBEDTLS_PK_C) && \
7688 ( defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C) )
Manuel Pégourié-Gonnard0d420492013-08-21 16:14:26 +02007689/*
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007690 * Convert between MBEDTLS_PK_XXX and SSL_SIG_XXX
Manuel Pégourié-Gonnard0d420492013-08-21 16:14:26 +02007691 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007692unsigned char mbedtls_ssl_sig_from_pk( mbedtls_pk_context *pk )
Manuel Pégourié-Gonnard0d420492013-08-21 16:14:26 +02007693{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007694#if defined(MBEDTLS_RSA_C)
7695 if( mbedtls_pk_can_do( pk, MBEDTLS_PK_RSA ) )
7696 return( MBEDTLS_SSL_SIG_RSA );
Manuel Pégourié-Gonnard0d420492013-08-21 16:14:26 +02007697#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007698#if defined(MBEDTLS_ECDSA_C)
7699 if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECDSA ) )
7700 return( MBEDTLS_SSL_SIG_ECDSA );
Manuel Pégourié-Gonnard0d420492013-08-21 16:14:26 +02007701#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007702 return( MBEDTLS_SSL_SIG_ANON );
Manuel Pégourié-Gonnard0d420492013-08-21 16:14:26 +02007703}
7704
Hanno Becker7e5437a2017-04-28 17:15:26 +01007705unsigned char mbedtls_ssl_sig_from_pk_alg( mbedtls_pk_type_t type )
7706{
7707 switch( type ) {
7708 case MBEDTLS_PK_RSA:
7709 return( MBEDTLS_SSL_SIG_RSA );
7710 case MBEDTLS_PK_ECDSA:
7711 case MBEDTLS_PK_ECKEY:
7712 return( MBEDTLS_SSL_SIG_ECDSA );
7713 default:
7714 return( MBEDTLS_SSL_SIG_ANON );
7715 }
7716}
7717
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007718mbedtls_pk_type_t mbedtls_ssl_pk_alg_from_sig( unsigned char sig )
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007719{
7720 switch( sig )
7721 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007722#if defined(MBEDTLS_RSA_C)
7723 case MBEDTLS_SSL_SIG_RSA:
7724 return( MBEDTLS_PK_RSA );
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007725#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007726#if defined(MBEDTLS_ECDSA_C)
7727 case MBEDTLS_SSL_SIG_ECDSA:
7728 return( MBEDTLS_PK_ECDSA );
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007729#endif
7730 default:
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007731 return( MBEDTLS_PK_NONE );
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007732 }
7733}
Manuel Pégourié-Gonnard5674a972015-10-19 15:14:03 +02007734#endif /* MBEDTLS_PK_C && ( MBEDTLS_RSA_C || MBEDTLS_ECDSA_C ) */
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007735
Hanno Becker7e5437a2017-04-28 17:15:26 +01007736#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
7737 defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
7738
7739/* Find an entry in a signature-hash set matching a given hash algorithm. */
7740mbedtls_md_type_t mbedtls_ssl_sig_hash_set_find( mbedtls_ssl_sig_hash_set_t *set,
7741 mbedtls_pk_type_t sig_alg )
7742{
7743 switch( sig_alg )
7744 {
7745 case MBEDTLS_PK_RSA:
7746 return( set->rsa );
7747 case MBEDTLS_PK_ECDSA:
7748 return( set->ecdsa );
7749 default:
7750 return( MBEDTLS_MD_NONE );
7751 }
7752}
7753
7754/* Add a signature-hash-pair to a signature-hash set */
7755void mbedtls_ssl_sig_hash_set_add( mbedtls_ssl_sig_hash_set_t *set,
7756 mbedtls_pk_type_t sig_alg,
7757 mbedtls_md_type_t md_alg )
7758{
7759 switch( sig_alg )
7760 {
7761 case MBEDTLS_PK_RSA:
7762 if( set->rsa == MBEDTLS_MD_NONE )
7763 set->rsa = md_alg;
7764 break;
7765
7766 case MBEDTLS_PK_ECDSA:
7767 if( set->ecdsa == MBEDTLS_MD_NONE )
7768 set->ecdsa = md_alg;
7769 break;
7770
7771 default:
7772 break;
7773 }
7774}
7775
7776/* Allow exactly one hash algorithm for each signature. */
7777void mbedtls_ssl_sig_hash_set_const_hash( mbedtls_ssl_sig_hash_set_t *set,
7778 mbedtls_md_type_t md_alg )
7779{
7780 set->rsa = md_alg;
7781 set->ecdsa = md_alg;
7782}
7783
7784#endif /* MBEDTLS_SSL_PROTO_TLS1_2) &&
7785 MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
7786
Manuel Pégourié-Gonnard1a483832013-09-20 12:29:15 +02007787/*
Manuel Pégourié-Gonnard7bfc1222015-06-17 14:34:48 +02007788 * Convert from MBEDTLS_SSL_HASH_XXX to MBEDTLS_MD_XXX
Manuel Pégourié-Gonnard1a483832013-09-20 12:29:15 +02007789 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007790mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash( unsigned char hash )
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007791{
7792 switch( hash )
7793 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007794#if defined(MBEDTLS_MD5_C)
7795 case MBEDTLS_SSL_HASH_MD5:
7796 return( MBEDTLS_MD_MD5 );
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007797#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007798#if defined(MBEDTLS_SHA1_C)
7799 case MBEDTLS_SSL_HASH_SHA1:
7800 return( MBEDTLS_MD_SHA1 );
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007801#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007802#if defined(MBEDTLS_SHA256_C)
7803 case MBEDTLS_SSL_HASH_SHA224:
7804 return( MBEDTLS_MD_SHA224 );
7805 case MBEDTLS_SSL_HASH_SHA256:
7806 return( MBEDTLS_MD_SHA256 );
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007807#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007808#if defined(MBEDTLS_SHA512_C)
7809 case MBEDTLS_SSL_HASH_SHA384:
7810 return( MBEDTLS_MD_SHA384 );
7811 case MBEDTLS_SSL_HASH_SHA512:
7812 return( MBEDTLS_MD_SHA512 );
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007813#endif
7814 default:
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007815 return( MBEDTLS_MD_NONE );
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007816 }
7817}
7818
Manuel Pégourié-Gonnard7bfc1222015-06-17 14:34:48 +02007819/*
7820 * Convert from MBEDTLS_MD_XXX to MBEDTLS_SSL_HASH_XXX
7821 */
7822unsigned char mbedtls_ssl_hash_from_md_alg( int md )
7823{
7824 switch( md )
7825 {
7826#if defined(MBEDTLS_MD5_C)
7827 case MBEDTLS_MD_MD5:
7828 return( MBEDTLS_SSL_HASH_MD5 );
7829#endif
7830#if defined(MBEDTLS_SHA1_C)
7831 case MBEDTLS_MD_SHA1:
7832 return( MBEDTLS_SSL_HASH_SHA1 );
7833#endif
7834#if defined(MBEDTLS_SHA256_C)
7835 case MBEDTLS_MD_SHA224:
7836 return( MBEDTLS_SSL_HASH_SHA224 );
7837 case MBEDTLS_MD_SHA256:
7838 return( MBEDTLS_SSL_HASH_SHA256 );
7839#endif
7840#if defined(MBEDTLS_SHA512_C)
7841 case MBEDTLS_MD_SHA384:
7842 return( MBEDTLS_SSL_HASH_SHA384 );
7843 case MBEDTLS_MD_SHA512:
7844 return( MBEDTLS_SSL_HASH_SHA512 );
7845#endif
7846 default:
7847 return( MBEDTLS_SSL_HASH_NONE );
7848 }
7849}
7850
Manuel Pégourié-Gonnardb541da62015-06-17 11:43:30 +02007851#if defined(MBEDTLS_ECP_C)
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01007852/*
Manuel Pégourié-Gonnard7bfc1222015-06-17 14:34:48 +02007853 * Check if a curve proposed by the peer is in our list.
Manuel Pégourié-Gonnard9d412d82015-06-17 12:10:46 +02007854 * Return 0 if we're willing to use it, -1 otherwise.
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01007855 */
Manuel Pégourié-Gonnard9d412d82015-06-17 12:10:46 +02007856int mbedtls_ssl_check_curve( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id )
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01007857{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007858 const mbedtls_ecp_group_id *gid;
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01007859
Manuel Pégourié-Gonnard9d412d82015-06-17 12:10:46 +02007860 if( ssl->conf->curve_list == NULL )
7861 return( -1 );
7862
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02007863 for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ )
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01007864 if( *gid == grp_id )
Manuel Pégourié-Gonnard9d412d82015-06-17 12:10:46 +02007865 return( 0 );
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01007866
Manuel Pégourié-Gonnard9d412d82015-06-17 12:10:46 +02007867 return( -1 );
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01007868}
Manuel Pégourié-Gonnardb541da62015-06-17 11:43:30 +02007869#endif /* MBEDTLS_ECP_C */
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007870
Manuel Pégourié-Gonnarde5f30722015-10-22 17:01:15 +02007871#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
Manuel Pégourié-Gonnard7bfc1222015-06-17 14:34:48 +02007872/*
7873 * Check if a hash proposed by the peer is in our list.
7874 * Return 0 if we're willing to use it, -1 otherwise.
7875 */
7876int mbedtls_ssl_check_sig_hash( const mbedtls_ssl_context *ssl,
7877 mbedtls_md_type_t md )
7878{
7879 const int *cur;
7880
7881 if( ssl->conf->sig_hashes == NULL )
7882 return( -1 );
7883
7884 for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ )
7885 if( *cur == (int) md )
7886 return( 0 );
7887
7888 return( -1 );
7889}
Manuel Pégourié-Gonnarde5f30722015-10-22 17:01:15 +02007890#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
Manuel Pégourié-Gonnard7bfc1222015-06-17 14:34:48 +02007891
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007892#if defined(MBEDTLS_X509_CRT_PARSE_C)
7893int mbedtls_ssl_check_cert_usage( const mbedtls_x509_crt *cert,
7894 const mbedtls_ssl_ciphersuite_t *ciphersuite,
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01007895 int cert_endpoint,
Manuel Pégourié-Gonnarde6ef16f2015-05-11 19:54:43 +02007896 uint32_t *flags )
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007897{
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01007898 int ret = 0;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007899#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007900 int usage = 0;
7901#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007902#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +02007903 const char *ext_oid;
7904 size_t ext_len;
7905#endif
7906
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007907#if !defined(MBEDTLS_X509_CHECK_KEY_USAGE) && \
7908 !defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +02007909 ((void) cert);
7910 ((void) cert_endpoint);
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01007911 ((void) flags);
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +02007912#endif
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007913
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007914#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
7915 if( cert_endpoint == MBEDTLS_SSL_IS_SERVER )
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007916 {
7917 /* Server part of the key exchange */
7918 switch( ciphersuite->key_exchange )
7919 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007920 case MBEDTLS_KEY_EXCHANGE_RSA:
7921 case MBEDTLS_KEY_EXCHANGE_RSA_PSK:
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01007922 usage = MBEDTLS_X509_KU_KEY_ENCIPHERMENT;
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007923 break;
7924
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007925 case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
7926 case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
7927 case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
7928 usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007929 break;
7930
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007931 case MBEDTLS_KEY_EXCHANGE_ECDH_RSA:
7932 case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA:
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01007933 usage = MBEDTLS_X509_KU_KEY_AGREEMENT;
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007934 break;
7935
7936 /* Don't use default: we want warnings when adding new values */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007937 case MBEDTLS_KEY_EXCHANGE_NONE:
7938 case MBEDTLS_KEY_EXCHANGE_PSK:
7939 case MBEDTLS_KEY_EXCHANGE_DHE_PSK:
7940 case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK:
Manuel Pégourié-Gonnard557535d2015-09-15 17:53:32 +02007941 case MBEDTLS_KEY_EXCHANGE_ECJPAKE:
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007942 usage = 0;
7943 }
7944 }
7945 else
7946 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007947 /* Client auth: we only implement rsa_sign and mbedtls_ecdsa_sign for now */
7948 usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007949 }
7950
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007951 if( mbedtls_x509_crt_check_key_usage( cert, usage ) != 0 )
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01007952 {
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01007953 *flags |= MBEDTLS_X509_BADCERT_KEY_USAGE;
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01007954 ret = -1;
7955 }
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +02007956#else
7957 ((void) ciphersuite);
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007958#endif /* MBEDTLS_X509_CHECK_KEY_USAGE */
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007959
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007960#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
7961 if( cert_endpoint == MBEDTLS_SSL_IS_SERVER )
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +02007962 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007963 ext_oid = MBEDTLS_OID_SERVER_AUTH;
7964 ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_SERVER_AUTH );
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +02007965 }
7966 else
7967 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007968 ext_oid = MBEDTLS_OID_CLIENT_AUTH;
7969 ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_CLIENT_AUTH );
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +02007970 }
7971
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007972 if( mbedtls_x509_crt_check_extended_key_usage( cert, ext_oid, ext_len ) != 0 )
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01007973 {
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01007974 *flags |= MBEDTLS_X509_BADCERT_EXT_KEY_USAGE;
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01007975 ret = -1;
7976 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007977#endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +02007978
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01007979 return( ret );
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007980}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007981#endif /* MBEDTLS_X509_CRT_PARSE_C */
Manuel Pégourié-Gonnard3a306b92014-04-29 15:11:17 +02007982
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01007983/*
7984 * Convert version numbers to/from wire format
7985 * and, for DTLS, to/from TLS equivalent.
7986 *
7987 * For TLS this is the identity.
Brian J Murray1903fb32016-11-06 04:45:15 -08007988 * For DTLS, use 1's complement (v -> 255 - v, and then map as follows:
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01007989 * 1.0 <-> 3.2 (DTLS 1.0 is based on TLS 1.1)
7990 * 1.x <-> 3.x+1 for x != 0 (DTLS 1.2 based on TLS 1.2)
7991 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007992void mbedtls_ssl_write_version( int major, int minor, int transport,
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01007993 unsigned char ver[2] )
7994{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007995#if defined(MBEDTLS_SSL_PROTO_DTLS)
7996 if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01007997 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007998 if( minor == MBEDTLS_SSL_MINOR_VERSION_2 )
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01007999 --minor; /* DTLS 1.0 stored as TLS 1.1 internally */
8000
8001 ver[0] = (unsigned char)( 255 - ( major - 2 ) );
8002 ver[1] = (unsigned char)( 255 - ( minor - 1 ) );
8003 }
Manuel Pégourié-Gonnard34c10112014-03-25 13:36:22 +01008004 else
8005#else
8006 ((void) transport);
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01008007#endif
Manuel Pégourié-Gonnard34c10112014-03-25 13:36:22 +01008008 {
8009 ver[0] = (unsigned char) major;
8010 ver[1] = (unsigned char) minor;
8011 }
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01008012}
8013
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02008014void mbedtls_ssl_read_version( int *major, int *minor, int transport,
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01008015 const unsigned char ver[2] )
8016{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02008017#if defined(MBEDTLS_SSL_PROTO_DTLS)
8018 if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01008019 {
8020 *major = 255 - ver[0] + 2;
8021 *minor = 255 - ver[1] + 1;
8022
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02008023 if( *minor == MBEDTLS_SSL_MINOR_VERSION_1 )
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01008024 ++*minor; /* DTLS 1.0 stored as TLS 1.1 internally */
8025 }
Manuel Pégourié-Gonnard34c10112014-03-25 13:36:22 +01008026 else
8027#else
8028 ((void) transport);
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01008029#endif
Manuel Pégourié-Gonnard34c10112014-03-25 13:36:22 +01008030 {
8031 *major = ver[0];
8032 *minor = ver[1];
8033 }
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01008034}
8035
Simon Butcher99000142016-10-13 17:21:01 +01008036int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md )
8037{
8038#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
8039 if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
8040 return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
8041
8042 switch( md )
8043 {
8044#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
8045#if defined(MBEDTLS_MD5_C)
8046 case MBEDTLS_SSL_HASH_MD5:
Janos Follath182013f2016-10-25 10:50:22 +01008047 return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
Simon Butcher99000142016-10-13 17:21:01 +01008048#endif
8049#if defined(MBEDTLS_SHA1_C)
8050 case MBEDTLS_SSL_HASH_SHA1:
8051 ssl->handshake->calc_verify = ssl_calc_verify_tls;
8052 break;
8053#endif
8054#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
8055#if defined(MBEDTLS_SHA512_C)
8056 case MBEDTLS_SSL_HASH_SHA384:
8057 ssl->handshake->calc_verify = ssl_calc_verify_tls_sha384;
8058 break;
8059#endif
8060#if defined(MBEDTLS_SHA256_C)
8061 case MBEDTLS_SSL_HASH_SHA256:
8062 ssl->handshake->calc_verify = ssl_calc_verify_tls_sha256;
8063 break;
8064#endif
8065 default:
8066 return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
8067 }
8068
8069 return 0;
8070#else /* !MBEDTLS_SSL_PROTO_TLS1_2 */
8071 (void) ssl;
8072 (void) md;
8073
8074 return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
8075#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
8076}
8077
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02008078#endif /* MBEDTLS_SSL_TLS_C */