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Paul Bakker5121ce52009-01-03 21:22:43 +00001/*
Mateusz Starzyk06b07fb2021-02-18 13:55:21 +01002 * TLS server-side functions
Paul Bakker5121ce52009-01-03 21:22:43 +00003 *
Bence Szépkúti1e148272020-08-07 13:07:28 +02004 * Copyright The Mbed TLS Contributors
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 Bakker5121ce52009-01-03 21:22:43 +000018 */
19
Gilles Peskinedb09ef62020-06-03 01:43:33 +020020#include "common.h"
Paul Bakker5121ce52009-01-03 21:22:43 +000021
Jerry Yufb4b6472022-01-27 15:03:26 +080022#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_PROTO_TLS1_2)
Jerry Yuc5aef882021-12-23 20:15:02 +080023
SimonBd5800b72016-04-26 07:43:27 +010024#if defined(MBEDTLS_PLATFORM_C)
25#include "mbedtls/platform.h"
26#else
27#include <stdlib.h>
28#define mbedtls_calloc calloc
29#define mbedtls_free free
SimonBd5800b72016-04-26 07:43:27 +010030#endif
31
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000032#include "mbedtls/ssl.h"
Chris Jones84a773f2021-03-05 18:38:47 +000033#include "ssl_misc.h"
Janos Follath73c616b2019-12-18 15:07:04 +000034#include "mbedtls/debug.h"
35#include "mbedtls/error.h"
Andres Amaya Garcia84914062018-04-24 08:40:46 -050036#include "mbedtls/platform_util.h"
Gabor Mezei22c9a6f2021-10-20 12:09:35 +020037#include "constant_time_internal.h"
Gabor Mezei765862c2021-10-19 12:22:25 +020038#include "mbedtls/constant_time.h"
Rich Evans00ab4702015-02-06 13:43:58 +000039
40#include <string.h>
41
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020042#if defined(MBEDTLS_ECP_C)
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000043#include "mbedtls/ecp.h"
Paul Bakker41c83d32013-03-20 14:39:14 +010044#endif
Paul Bakker5121ce52009-01-03 21:22:43 +000045
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020046#if defined(MBEDTLS_HAVE_TIME)
Simon Butcherb5b6af22016-07-13 14:46:18 +010047#include "mbedtls/platform_time.h"
Paul Bakkerfa9b1002013-07-03 15:31:03 +020048#endif
Paul Bakker5121ce52009-01-03 21:22:43 +000049
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020050#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
51int mbedtls_ssl_set_client_transport_id( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnard43c02182014-07-22 17:32:01 +020052 const unsigned char *info,
53 size_t ilen )
54{
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +020055 if( ssl->conf->endpoint != MBEDTLS_SSL_IS_SERVER )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020056 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnard43c02182014-07-22 17:32:01 +020057
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020058 mbedtls_free( ssl->cli_id );
Manuel Pégourié-Gonnard43c02182014-07-22 17:32:01 +020059
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +020060 if( ( ssl->cli_id = mbedtls_calloc( 1, ilen ) ) == NULL )
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +020061 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Manuel Pégourié-Gonnard43c02182014-07-22 17:32:01 +020062
63 memcpy( ssl->cli_id, info, ilen );
64 ssl->cli_id_len = ilen;
65
66 return( 0 );
67}
Manuel Pégourié-Gonnardd485d192014-07-23 14:56:15 +020068
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +020069void mbedtls_ssl_conf_dtls_cookies( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020070 mbedtls_ssl_cookie_write_t *f_cookie_write,
71 mbedtls_ssl_cookie_check_t *f_cookie_check,
Manuel Pégourié-Gonnardd485d192014-07-23 14:56:15 +020072 void *p_cookie )
73{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +020074 conf->f_cookie_write = f_cookie_write;
75 conf->f_cookie_check = f_cookie_check;
76 conf->p_cookie = p_cookie;
Manuel Pégourié-Gonnardd485d192014-07-23 14:56:15 +020077}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020078#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
Manuel Pégourié-Gonnard43c02182014-07-22 17:32:01 +020079
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020080#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020081static int ssl_parse_servername_ext( mbedtls_ssl_context *ssl,
Paul Bakker23f36802012-09-28 14:15:14 +000082 const unsigned char *buf,
Paul Bakker5701cdc2012-09-27 21:49:42 +000083 size_t len )
84{
Janos Follath865b3eb2019-12-16 11:46:15 +000085 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
Paul Bakker5701cdc2012-09-27 21:49:42 +000086 size_t servername_list_size, hostname_len;
Paul Bakker23f36802012-09-28 14:15:14 +000087 const unsigned char *p;
Paul Bakker5701cdc2012-09-27 21:49:42 +000088
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020089 MBEDTLS_SSL_DEBUG_MSG( 3, ( "parse ServerName extension" ) );
Manuel Pégourié-Gonnard96ea2f22014-02-25 12:26:29 +010090
Philippe Antoine747fd532018-05-30 09:13:21 +020091 if( len < 2 )
92 {
93 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
94 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
95 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +010096 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Philippe Antoine747fd532018-05-30 09:13:21 +020097 }
Paul Bakker5701cdc2012-09-27 21:49:42 +000098 servername_list_size = ( ( buf[0] << 8 ) | ( buf[1] ) );
99 if( servername_list_size + 2 != len )
100 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200101 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +0200102 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
103 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +0100104 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakker5701cdc2012-09-27 21:49:42 +0000105 }
106
107 p = buf + 2;
Philippe Antoine747fd532018-05-30 09:13:21 +0200108 while( servername_list_size > 2 )
Paul Bakker5701cdc2012-09-27 21:49:42 +0000109 {
110 hostname_len = ( ( p[1] << 8 ) | p[2] );
111 if( hostname_len + 3 > servername_list_size )
112 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200113 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +0200114 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
115 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +0100116 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakker5701cdc2012-09-27 21:49:42 +0000117 }
118
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200119 if( p[0] == MBEDTLS_TLS_EXT_SERVERNAME_HOSTNAME )
Paul Bakker5701cdc2012-09-27 21:49:42 +0000120 {
Glenn Strauss69894072022-01-24 12:58:00 -0500121 ssl->handshake->sni_name = p + 3;
122 ssl->handshake->sni_name_len = hostname_len;
123 if( ssl->conf->f_sni == NULL )
124 return( 0 );
125
Manuel Pégourié-Gonnard1af6c852015-05-10 23:10:37 +0200126 ret = ssl->conf->f_sni( ssl->conf->p_sni,
127 ssl, p + 3, hostname_len );
Paul Bakker5701cdc2012-09-27 21:49:42 +0000128 if( ret != 0 )
129 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200130 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_sni_wrapper", ret );
131 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
132 MBEDTLS_SSL_ALERT_MSG_UNRECOGNIZED_NAME );
Hanno Becker90d59dd2021-06-24 11:17:13 +0100133 return( MBEDTLS_ERR_SSL_UNRECOGNIZED_NAME );
Paul Bakker5701cdc2012-09-27 21:49:42 +0000134 }
Paul Bakker81420ab2012-10-23 10:31:15 +0000135 return( 0 );
Paul Bakker5701cdc2012-09-27 21:49:42 +0000136 }
137
138 servername_list_size -= hostname_len + 3;
Paul Bakker23f36802012-09-28 14:15:14 +0000139 p += hostname_len + 3;
140 }
141
142 if( servername_list_size != 0 )
143 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200144 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +0200145 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
Hanno Becker90d59dd2021-06-24 11:17:13 +0100146 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
147 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakker5701cdc2012-09-27 21:49:42 +0000148 }
149
150 return( 0 );
151}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200152#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
Paul Bakker5701cdc2012-09-27 21:49:42 +0000153
Gilles Peskineeccd8882020-03-10 12:19:08 +0100154#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
Hanno Becker845b9462018-10-26 12:07:29 +0100155static int ssl_conf_has_psk_or_cb( mbedtls_ssl_config const *conf )
156{
157 if( conf->f_psk != NULL )
158 return( 1 );
159
160 if( conf->psk_identity_len == 0 || conf->psk_identity == NULL )
161 return( 0 );
162
163 if( conf->psk != NULL && conf->psk_len != 0 )
164 return( 1 );
165
166#if defined(MBEDTLS_USE_PSA_CRYPTO)
Ronald Croncf56a0a2020-08-04 09:51:30 +0200167 if( ! mbedtls_svc_key_id_is_null( conf->psk_opaque ) )
Hanno Becker845b9462018-10-26 12:07:29 +0100168 return( 1 );
169#endif /* MBEDTLS_USE_PSA_CRYPTO */
170
171 return( 0 );
172}
173
174#if defined(MBEDTLS_USE_PSA_CRYPTO)
175static int ssl_use_opaque_psk( mbedtls_ssl_context const *ssl )
176{
177 if( ssl->conf->f_psk != NULL )
178 {
179 /* If we've used a callback to select the PSK,
180 * the static configuration is irrelevant. */
181
Ronald Croncf56a0a2020-08-04 09:51:30 +0200182 if( ! mbedtls_svc_key_id_is_null( ssl->handshake->psk_opaque ) )
Hanno Becker845b9462018-10-26 12:07:29 +0100183 return( 1 );
184
185 return( 0 );
186 }
187
Ronald Croncf56a0a2020-08-04 09:51:30 +0200188 if( ! mbedtls_svc_key_id_is_null( ssl->conf->psk_opaque ) )
Hanno Becker845b9462018-10-26 12:07:29 +0100189 return( 1 );
190
191 return( 0 );
192}
193#endif /* MBEDTLS_USE_PSA_CRYPTO */
Gilles Peskineeccd8882020-03-10 12:19:08 +0100194#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
Hanno Becker845b9462018-10-26 12:07:29 +0100195
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200196static int ssl_parse_renegotiation_info( mbedtls_ssl_context *ssl,
Paul Bakker23f36802012-09-28 14:15:14 +0000197 const unsigned char *buf,
Paul Bakker48916f92012-09-16 19:57:18 +0000198 size_t len )
199{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200200#if defined(MBEDTLS_SSL_RENEGOTIATION)
201 if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +0100202 {
203 /* Check verify-data in constant-time. The length OTOH is no secret */
204 if( len != 1 + ssl->verify_data_len ||
205 buf[0] != ssl->verify_data_len ||
Gabor Mezei90437e32021-10-20 11:59:27 +0200206 mbedtls_ct_memcmp( buf + 1, ssl->peer_verify_data,
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +0100207 ssl->verify_data_len ) != 0 )
208 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200209 MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching renegotiation info" ) );
Gilles Peskinec94f7352017-05-10 16:37:56 +0200210 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
211 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
Dave Rodgman43fcb8d2021-06-28 21:49:15 +0100212 return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +0100213 }
214 }
215 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200216#endif /* MBEDTLS_SSL_RENEGOTIATION */
Paul Bakker48916f92012-09-16 19:57:18 +0000217 {
218 if( len != 1 || buf[0] != 0x0 )
219 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200220 MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-zero length renegotiation info" ) );
Gilles Peskinec94f7352017-05-10 16:37:56 +0200221 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
222 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
Dave Rodgman43fcb8d2021-06-28 21:49:15 +0100223 return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
Paul Bakker48916f92012-09-16 19:57:18 +0000224 }
225
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200226 ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
Paul Bakker48916f92012-09-16 19:57:18 +0000227 }
Paul Bakker48916f92012-09-16 19:57:18 +0000228
229 return( 0 );
230}
231
Jerry Yue7541932022-01-28 10:21:24 +0800232#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
Hanno Becker7e5437a2017-04-28 17:15:26 +0100233
234/*
235 * Status of the implementation of signature-algorithms extension:
236 *
237 * Currently, we are only considering the signature-algorithm extension
238 * to pick a ciphersuite which allows us to send the ServerKeyExchange
239 * message with a signature-hash combination that the user allows.
240 *
241 * We do *not* check whether all certificates in our certificate
242 * chain are signed with an allowed signature-hash pair.
243 * This needs to be done at a later stage.
244 *
245 */
Jerry Yu18cd4392021-12-17 17:44:24 +0800246static int ssl_parse_sig_alg_ext( mbedtls_ssl_context *ssl,
247 const unsigned char *buf,
248 size_t len )
Paul Bakker23f36802012-09-28 14:15:14 +0000249{
250 size_t sig_alg_list_size;
Hanno Becker7e5437a2017-04-28 17:15:26 +0100251
Paul Bakker23f36802012-09-28 14:15:14 +0000252 const unsigned char *p;
Manuel Pégourié-Gonnard08e81e02014-07-08 12:56:25 +0200253 const unsigned char *end = buf + len;
Manuel Pégourié-Gonnard08e81e02014-07-08 12:56:25 +0200254
Hanno Becker7e5437a2017-04-28 17:15:26 +0100255 mbedtls_md_type_t md_cur;
256 mbedtls_pk_type_t sig_cur;
Paul Bakker23f36802012-09-28 14:15:14 +0000257
Philippe Antoine747fd532018-05-30 09:13:21 +0200258 if ( len < 2 ) {
259 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
260 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
261 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +0100262 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Philippe Antoine747fd532018-05-30 09:13:21 +0200263 }
Paul Bakker23f36802012-09-28 14:15:14 +0000264 sig_alg_list_size = ( ( buf[0] << 8 ) | ( buf[1] ) );
265 if( sig_alg_list_size + 2 != len ||
Manuel Pégourié-Gonnard08e81e02014-07-08 12:56:25 +0200266 sig_alg_list_size % 2 != 0 )
Paul Bakker23f36802012-09-28 14:15:14 +0000267 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200268 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +0200269 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
270 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +0100271 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakker23f36802012-09-28 14:15:14 +0000272 }
273
Hanno Becker7e5437a2017-04-28 17:15:26 +0100274 /* Currently we only guarantee signing the ServerKeyExchange message according
275 * to the constraints specified in this extension (see above), so it suffices
276 * to remember only one suitable hash for each possible signature algorithm.
Manuel Pégourié-Gonnard08e81e02014-07-08 12:56:25 +0200277 *
Hanno Becker7e5437a2017-04-28 17:15:26 +0100278 * This will change when we also consider certificate signatures,
279 * in which case we will need to remember the whole signature-hash
280 * pair list from the extension.
Manuel Pégourié-Gonnard08e81e02014-07-08 12:56:25 +0200281 */
Hanno Becker7e5437a2017-04-28 17:15:26 +0100282
283 for( p = buf + 2; p < end; p += 2 )
284 {
285 /* Silently ignore unknown signature or hash algorithms. */
286
287 if( ( sig_cur = mbedtls_ssl_pk_alg_from_sig( p[1] ) ) == MBEDTLS_PK_NONE )
288 {
Hanno Becker0d0cd4b2017-05-11 14:06:43 +0100289 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext"
290 " unknown sig alg encoding %d", p[1] ) );
Hanno Becker7e5437a2017-04-28 17:15:26 +0100291 continue;
292 }
293
294 /* Check if we support the hash the user proposes */
295 md_cur = mbedtls_ssl_md_alg_from_hash( p[0] );
296 if( md_cur == MBEDTLS_MD_NONE )
297 {
Hanno Becker0d0cd4b2017-05-11 14:06:43 +0100298 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext:"
299 " unknown hash alg encoding %d", p[0] ) );
Hanno Becker7e5437a2017-04-28 17:15:26 +0100300 continue;
301 }
302
Jerry Yu24811fb2022-01-19 18:02:15 +0800303 if( mbedtls_ssl_sig_alg_is_offered(
304 ssl, MBEDTLS_GET_UINT16_BE( p, 0 ) ) )
Hanno Becker7e5437a2017-04-28 17:15:26 +0100305 {
306 mbedtls_ssl_sig_hash_set_add( &ssl->handshake->hash_algs, sig_cur, md_cur );
Hanno Becker0d0cd4b2017-05-11 14:06:43 +0100307 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext:"
Paul Elliott9f352112020-12-09 14:55:45 +0000308 " match sig %u and hash %u",
Paul Elliott3891caf2020-12-17 18:42:40 +0000309 (unsigned) sig_cur, (unsigned) md_cur ) );
Hanno Becker7e5437a2017-04-28 17:15:26 +0100310 }
311 else
312 {
Hanno Becker0d0cd4b2017-05-11 14:06:43 +0100313 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext: "
Paul Elliott3891caf2020-12-17 18:42:40 +0000314 "hash alg %u not supported", (unsigned) md_cur ) );
Paul Bakker23f36802012-09-28 14:15:14 +0000315 }
Paul Bakker23f36802012-09-28 14:15:14 +0000316 }
317
Paul Bakker23f36802012-09-28 14:15:14 +0000318 return( 0 );
319}
Jerry Yue7541932022-01-28 10:21:24 +0800320#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
Paul Bakker23f36802012-09-28 14:15:14 +0000321
Robert Cragie136884c2015-10-02 13:34:31 +0100322#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
Robert Cragieae8535d2015-10-06 17:11:18 +0100323 defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
Jerry Yub925f212022-01-12 11:17:02 +0800324/*
Jerry Yud491ea42022-01-13 16:15:25 +0800325 * Function for parsing a supported groups (TLS 1.3) or supported elliptic
326 * curves (TLS 1.2) extension.
327 *
328 * The "extension_data" field of a supported groups extension contains a
329 * "NamedGroupList" value (TLS 1.3 RFC8446):
330 * enum {
331 * secp256r1(0x0017), secp384r1(0x0018), secp521r1(0x0019),
332 * x25519(0x001D), x448(0x001E),
333 * ffdhe2048(0x0100), ffdhe3072(0x0101), ffdhe4096(0x0102),
334 * ffdhe6144(0x0103), ffdhe8192(0x0104),
335 * ffdhe_private_use(0x01FC..0x01FF),
336 * ecdhe_private_use(0xFE00..0xFEFF),
337 * (0xFFFF)
338 * } NamedGroup;
339 * struct {
340 * NamedGroup named_group_list<2..2^16-1>;
341 * } NamedGroupList;
342 *
343 * The "extension_data" field of a supported elliptic curves extension contains
344 * a "NamedCurveList" value (TLS 1.2 RFC 8422):
345 * enum {
346 * deprecated(1..22),
347 * secp256r1 (23), secp384r1 (24), secp521r1 (25),
348 * x25519(29), x448(30),
349 * reserved (0xFE00..0xFEFF),
350 * deprecated(0xFF01..0xFF02),
351 * (0xFFFF)
352 * } NamedCurve;
353 * struct {
354 * NamedCurve named_curve_list<2..2^16-1>
355 * } NamedCurveList;
356 *
Jerry Yub925f212022-01-12 11:17:02 +0800357 * The TLS 1.3 supported groups extension was defined to be a compatible
358 * generalization of the TLS 1.2 supported elliptic curves extension. They both
359 * share the same extension identifier.
Jerry Yud491ea42022-01-13 16:15:25 +0800360 *
361 * DHE groups are not supported yet.
Jerry Yub925f212022-01-12 11:17:02 +0800362 */
Jerry Yub47d0f82021-12-20 17:34:40 +0800363static int ssl_parse_supported_groups_ext( mbedtls_ssl_context *ssl,
Jerry Yuffef9c52021-12-24 22:31:08 +0800364 const unsigned char *buf,
365 size_t len )
Paul Bakker41c83d32013-03-20 14:39:14 +0100366{
Manuel Pégourié-Gonnardd09453c2013-09-23 19:11:32 +0200367 size_t list_size, our_size;
Paul Bakker41c83d32013-03-20 14:39:14 +0100368 const unsigned char *p;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200369 const mbedtls_ecp_curve_info *curve_info, **curves;
Paul Bakker41c83d32013-03-20 14:39:14 +0100370
Philippe Antoine747fd532018-05-30 09:13:21 +0200371 if ( len < 2 ) {
372 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
373 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
374 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +0100375 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Philippe Antoine747fd532018-05-30 09:13:21 +0200376 }
Paul Bakker41c83d32013-03-20 14:39:14 +0100377 list_size = ( ( buf[0] << 8 ) | ( buf[1] ) );
378 if( list_size + 2 != len ||
379 list_size % 2 != 0 )
380 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200381 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +0200382 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
383 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +0100384 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakker41c83d32013-03-20 14:39:14 +0100385 }
386
Manuel Pégourié-Gonnard43c3b282014-10-17 12:42:11 +0200387 /* Should never happen unless client duplicates the extension */
388 if( ssl->handshake->curves != NULL )
389 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200390 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +0200391 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
Hanno Becker90d59dd2021-06-24 11:17:13 +0100392 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
393 return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
Manuel Pégourié-Gonnard43c3b282014-10-17 12:42:11 +0200394 }
395
Manuel Pégourié-Gonnardc3f6b62c2014-02-06 10:13:09 +0100396 /* Don't allow our peer to make us allocate too much memory,
Manuel Pégourié-Gonnardd09453c2013-09-23 19:11:32 +0200397 * and leave room for a final 0 */
398 our_size = list_size / 2 + 1;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200399 if( our_size > MBEDTLS_ECP_DP_MAX )
400 our_size = MBEDTLS_ECP_DP_MAX;
Manuel Pégourié-Gonnardd09453c2013-09-23 19:11:32 +0200401
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +0200402 if( ( curves = mbedtls_calloc( our_size, sizeof( *curves ) ) ) == NULL )
Gilles Peskine1cc8e342017-05-03 16:28:34 +0200403 {
404 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
405 MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +0200406 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Gilles Peskine1cc8e342017-05-03 16:28:34 +0200407 }
Manuel Pégourié-Gonnardd09453c2013-09-23 19:11:32 +0200408
Manuel Pégourié-Gonnardd09453c2013-09-23 19:11:32 +0200409 ssl->handshake->curves = curves;
410
Paul Bakker41c83d32013-03-20 14:39:14 +0100411 p = buf + 2;
Manuel Pégourié-Gonnardd09453c2013-09-23 19:11:32 +0200412 while( list_size > 0 && our_size > 1 )
Paul Bakker41c83d32013-03-20 14:39:14 +0100413 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200414 curve_info = mbedtls_ecp_curve_info_from_tls_id( ( p[0] << 8 ) | p[1] );
Manuel Pégourié-Gonnard568c9cf2013-09-16 17:30:04 +0200415
Manuel Pégourié-Gonnardf24b4a72013-09-23 18:14:50 +0200416 if( curve_info != NULL )
Paul Bakker41c83d32013-03-20 14:39:14 +0100417 {
Manuel Pégourié-Gonnardd09453c2013-09-23 19:11:32 +0200418 *curves++ = curve_info;
419 our_size--;
Paul Bakker41c83d32013-03-20 14:39:14 +0100420 }
421
422 list_size -= 2;
423 p += 2;
424 }
425
426 return( 0 );
427}
428
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200429static int ssl_parse_supported_point_formats( mbedtls_ssl_context *ssl,
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +0200430 const unsigned char *buf,
431 size_t len )
Paul Bakker41c83d32013-03-20 14:39:14 +0100432{
433 size_t list_size;
434 const unsigned char *p;
435
Philippe Antoine747fd532018-05-30 09:13:21 +0200436 if( len == 0 || (size_t)( buf[0] + 1 ) != len )
Paul Bakker41c83d32013-03-20 14:39:14 +0100437 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200438 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +0200439 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
440 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +0100441 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakker41c83d32013-03-20 14:39:14 +0100442 }
Philippe Antoine747fd532018-05-30 09:13:21 +0200443 list_size = buf[0];
Paul Bakker41c83d32013-03-20 14:39:14 +0100444
Manuel Pégourié-Gonnardc1b46d02015-09-16 11:18:32 +0200445 p = buf + 1;
Paul Bakker41c83d32013-03-20 14:39:14 +0100446 while( list_size > 0 )
447 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200448 if( p[0] == MBEDTLS_ECP_PF_UNCOMPRESSED ||
449 p[0] == MBEDTLS_ECP_PF_COMPRESSED )
Paul Bakker41c83d32013-03-20 14:39:14 +0100450 {
Robert Cragie136884c2015-10-02 13:34:31 +0100451#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
Manuel Pégourié-Gonnard5734b2d2013-08-15 19:04:02 +0200452 ssl->handshake->ecdh_ctx.point_format = p[0];
Robert Cragie136884c2015-10-02 13:34:31 +0100453#endif
Robert Cragieae8535d2015-10-06 17:11:18 +0100454#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
Gilles Peskinecd07e222021-05-27 23:17:34 +0200455 mbedtls_ecjpake_set_point_format( &ssl->handshake->ecjpake_ctx,
456 p[0] );
Robert Cragie136884c2015-10-02 13:34:31 +0100457#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200458 MBEDTLS_SSL_DEBUG_MSG( 4, ( "point format selected: %d", p[0] ) );
Paul Bakker41c83d32013-03-20 14:39:14 +0100459 return( 0 );
460 }
461
462 list_size--;
463 p++;
464 }
465
466 return( 0 );
467}
Robert Cragieae8535d2015-10-06 17:11:18 +0100468#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
469 MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
Paul Bakker41c83d32013-03-20 14:39:14 +0100470
Manuel Pégourié-Gonnardbf57be62015-09-16 15:04:01 +0200471#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
472static int ssl_parse_ecjpake_kkpp( mbedtls_ssl_context *ssl,
473 const unsigned char *buf,
474 size_t len )
475{
Janos Follath865b3eb2019-12-16 11:46:15 +0000476 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
Manuel Pégourié-Gonnardbf57be62015-09-16 15:04:01 +0200477
478 if( mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 )
479 {
480 MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip ecjpake kkpp extension" ) );
481 return( 0 );
482 }
483
484 if( ( ret = mbedtls_ecjpake_read_round_one( &ssl->handshake->ecjpake_ctx,
485 buf, len ) ) != 0 )
486 {
487 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_one", ret );
Gilles Peskine1cc8e342017-05-03 16:28:34 +0200488 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
489 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
Manuel Pégourié-Gonnardbf57be62015-09-16 15:04:01 +0200490 return( ret );
491 }
492
493 /* Only mark the extension as OK when we're sure it is */
494 ssl->handshake->cli_exts |= MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK;
495
496 return( 0 );
497}
498#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
499
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200500#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
501static int ssl_parse_max_fragment_length_ext( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnard48f8d0d2013-07-17 10:25:37 +0200502 const unsigned char *buf,
503 size_t len )
504{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200505 if( len != 1 || buf[0] >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID )
Manuel Pégourié-Gonnard48f8d0d2013-07-17 10:25:37 +0200506 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200507 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +0200508 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
509 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
Hanno Becker90d59dd2021-06-24 11:17:13 +0100510 return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
Manuel Pégourié-Gonnard48f8d0d2013-07-17 10:25:37 +0200511 }
512
Manuel Pégourié-Gonnarded4af8b2013-07-18 14:07:09 +0200513 ssl->session_negotiate->mfl_code = buf[0];
514
Manuel Pégourié-Gonnard48f8d0d2013-07-17 10:25:37 +0200515 return( 0 );
516}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200517#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
Manuel Pégourié-Gonnard48f8d0d2013-07-17 10:25:37 +0200518
Hanno Beckera0e20d02019-05-15 14:03:01 +0100519#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
Hanno Becker89dcc882019-04-26 13:56:39 +0100520static int ssl_parse_cid_ext( mbedtls_ssl_context *ssl,
521 const unsigned char *buf,
522 size_t len )
523{
524 size_t peer_cid_len;
525
526 /* CID extension only makes sense in DTLS */
527 if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM )
528 {
529 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
530 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
531 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
Hanno Becker90d59dd2021-06-24 11:17:13 +0100532 return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
Hanno Becker89dcc882019-04-26 13:56:39 +0100533 }
534
535 /*
Hanno Beckerebcc9132019-05-15 10:26:32 +0100536 * Quoting draft-ietf-tls-dtls-connection-id-05
537 * https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05
Hanno Becker89dcc882019-04-26 13:56:39 +0100538 *
539 * struct {
540 * opaque cid<0..2^8-1>;
541 * } ConnectionId;
542 */
543
544 if( len < 1 )
545 {
546 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
547 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
Hanno Becker90d59dd2021-06-24 11:17:13 +0100548 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
549 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Hanno Becker89dcc882019-04-26 13:56:39 +0100550 }
551
552 peer_cid_len = *buf++;
553 len--;
554
555 if( len != peer_cid_len )
556 {
557 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
558 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
Hanno Becker90d59dd2021-06-24 11:17:13 +0100559 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
560 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Hanno Becker89dcc882019-04-26 13:56:39 +0100561 }
562
563 /* Ignore CID if the user has disabled its use. */
564 if( ssl->negotiate_cid == MBEDTLS_SSL_CID_DISABLED )
565 {
566 /* Leave ssl->handshake->cid_in_use in its default
567 * value of MBEDTLS_SSL_CID_DISABLED. */
568 MBEDTLS_SSL_DEBUG_MSG( 3, ( "Client sent CID extension, but CID disabled" ) );
569 return( 0 );
570 }
571
572 if( peer_cid_len > MBEDTLS_SSL_CID_OUT_LEN_MAX )
573 {
574 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
575 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
576 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
Hanno Becker90d59dd2021-06-24 11:17:13 +0100577 return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
Hanno Becker89dcc882019-04-26 13:56:39 +0100578 }
579
Hanno Becker08556bf2019-05-03 12:43:44 +0100580 ssl->handshake->cid_in_use = MBEDTLS_SSL_CID_ENABLED;
Hanno Becker89dcc882019-04-26 13:56:39 +0100581 ssl->handshake->peer_cid_len = (uint8_t) peer_cid_len;
582 memcpy( ssl->handshake->peer_cid, buf, peer_cid_len );
583
584 MBEDTLS_SSL_DEBUG_MSG( 3, ( "Use of CID extension negotiated" ) );
585 MBEDTLS_SSL_DEBUG_BUF( 3, "Client CID", buf, peer_cid_len );
586
Hanno Becker89dcc882019-04-26 13:56:39 +0100587 return( 0 );
588}
Hanno Beckera0e20d02019-05-15 14:03:01 +0100589#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
Hanno Becker89dcc882019-04-26 13:56:39 +0100590
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200591#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
592static int ssl_parse_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnard699cafa2014-10-27 13:57:03 +0100593 const unsigned char *buf,
594 size_t len )
595{
596 if( len != 0 )
597 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200598 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +0200599 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
600 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +0100601 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Manuel Pégourié-Gonnard699cafa2014-10-27 13:57:03 +0100602 }
603
604 ((void) buf);
605
Mateusz Starzyk06b07fb2021-02-18 13:55:21 +0100606 if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED )
Manuel Pégourié-Gonnard699cafa2014-10-27 13:57:03 +0100607 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200608 ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
Manuel Pégourié-Gonnard699cafa2014-10-27 13:57:03 +0100609 }
610
611 return( 0 );
612}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200613#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
Manuel Pégourié-Gonnard699cafa2014-10-27 13:57:03 +0100614
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200615#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
616static int ssl_parse_extended_ms_ext( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +0200617 const unsigned char *buf,
618 size_t len )
619{
620 if( len != 0 )
621 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200622 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +0200623 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
624 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +0100625 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +0200626 }
627
628 ((void) buf);
629
Mateusz Starzyk06b07fb2021-02-18 13:55:21 +0100630 if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED )
Manuel Pégourié-Gonnardb575b542014-10-24 15:12:31 +0200631 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200632 ssl->handshake->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
Manuel Pégourié-Gonnardb575b542014-10-24 15:12:31 +0200633 }
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +0200634
635 return( 0 );
636}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200637#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +0200638
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200639#if defined(MBEDTLS_SSL_SESSION_TICKETS)
640static int ssl_parse_session_ticket_ext( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnard990c51a2013-08-03 15:37:58 +0200641 unsigned char *buf,
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +0200642 size_t len )
643{
Janos Follath865b3eb2019-12-16 11:46:15 +0000644 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
Manuel Pégourié-Gonnard69f17282015-05-18 14:35:08 +0200645 mbedtls_ssl_session session;
Manuel Pégourié-Gonnard990c51a2013-08-03 15:37:58 +0200646
Manuel Pégourié-Gonnardbae389b2015-06-24 10:45:58 +0200647 mbedtls_ssl_session_init( &session );
648
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +0200649 if( ssl->conf->f_ticket_parse == NULL ||
650 ssl->conf->f_ticket_write == NULL )
651 {
Manuel Pégourié-Gonnardaa0d4d12013-08-03 13:02:31 +0200652 return( 0 );
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +0200653 }
Manuel Pégourié-Gonnardaa0d4d12013-08-03 13:02:31 +0200654
Manuel Pégourié-Gonnard306827e2013-08-02 18:05:14 +0200655 /* Remember the client asked us to send a new ticket */
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +0200656 ssl->handshake->new_session_ticket = 1;
657
Paul Elliottd48d5c62021-01-07 14:47:05 +0000658 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket length: %" MBEDTLS_PRINTF_SIZET, len ) );
Manuel Pégourié-Gonnard3ffa3db2013-08-02 11:59:05 +0200659
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +0200660 if( len == 0 )
661 return( 0 );
662
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200663#if defined(MBEDTLS_SSL_RENEGOTIATION)
664 if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
Manuel Pégourié-Gonnard3ffa3db2013-08-02 11:59:05 +0200665 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200666 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket rejected: renegotiating" ) );
Manuel Pégourié-Gonnard3ffa3db2013-08-02 11:59:05 +0200667 return( 0 );
668 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200669#endif /* MBEDTLS_SSL_RENEGOTIATION */
Manuel Pégourié-Gonnard609bc812013-08-01 15:08:40 +0200670
671 /*
Manuel Pégourié-Gonnard609bc812013-08-01 15:08:40 +0200672 * Failures are ok: just ignore the ticket and proceed.
673 */
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +0200674 if( ( ret = ssl->conf->f_ticket_parse( ssl->conf->p_ticket, &session,
675 buf, len ) ) != 0 )
Manuel Pégourié-Gonnard990c51a2013-08-03 15:37:58 +0200676 {
Manuel Pégourié-Gonnard69f17282015-05-18 14:35:08 +0200677 mbedtls_ssl_session_free( &session );
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +0200678
679 if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
680 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is not authentic" ) );
681 else if( ret == MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED )
682 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is expired" ) );
683 else
684 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_ticket_parse", ret );
685
Manuel Pégourié-Gonnard609bc812013-08-01 15:08:40 +0200686 return( 0 );
Manuel Pégourié-Gonnard990c51a2013-08-03 15:37:58 +0200687 }
Manuel Pégourié-Gonnard609bc812013-08-01 15:08:40 +0200688
Manuel Pégourié-Gonnard69f17282015-05-18 14:35:08 +0200689 /*
690 * Keep the session ID sent by the client, since we MUST send it back to
691 * inform them we're accepting the ticket (RFC 5077 section 3.4)
692 */
Manuel Pégourié-Gonnard12ad7982015-06-18 15:50:37 +0200693 session.id_len = ssl->session_negotiate->id_len;
694 memcpy( &session.id, ssl->session_negotiate->id, session.id_len );
Manuel Pégourié-Gonnard69f17282015-05-18 14:35:08 +0200695
696 mbedtls_ssl_session_free( ssl->session_negotiate );
697 memcpy( ssl->session_negotiate, &session, sizeof( mbedtls_ssl_session ) );
698
699 /* Zeroize instead of free as we copied the content */
Andres Amaya Garcia1f6301b2018-04-17 09:51:09 -0500700 mbedtls_platform_zeroize( &session, sizeof( mbedtls_ssl_session ) );
Manuel Pégourié-Gonnard69f17282015-05-18 14:35:08 +0200701
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200702 MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from ticket" ) );
Manuel Pégourié-Gonnard609bc812013-08-01 15:08:40 +0200703
Manuel Pégourié-Gonnard609bc812013-08-01 15:08:40 +0200704 ssl->handshake->resume = 1;
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +0200705
Manuel Pégourié-Gonnard306827e2013-08-02 18:05:14 +0200706 /* Don't send a new ticket after all, this one is OK */
707 ssl->handshake->new_session_ticket = 0;
708
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +0200709 return( 0 );
710}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200711#endif /* MBEDTLS_SSL_SESSION_TICKETS */
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +0200712
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200713#if defined(MBEDTLS_SSL_ALPN)
714static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnard14beb082014-07-08 13:50:35 +0200715 const unsigned char *buf, size_t len )
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +0200716{
Paul Bakker14b16c62014-05-28 11:33:54 +0200717 size_t list_len, cur_len, ours_len;
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +0200718 const unsigned char *theirs, *start, *end;
719 const char **ours;
720
721 /* If ALPN not configured, just ignore the extension */
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +0200722 if( ssl->conf->alpn_list == NULL )
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +0200723 return( 0 );
724
725 /*
726 * opaque ProtocolName<1..2^8-1>;
727 *
728 * struct {
729 * ProtocolName protocol_name_list<2..2^16-1>
730 * } ProtocolNameList;
731 */
732
733 /* Min length is 2 (list_len) + 1 (name_len) + 1 (name) */
734 if( len < 4 )
Gilles Peskine1cc8e342017-05-03 16:28:34 +0200735 {
736 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
737 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +0100738 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Gilles Peskine1cc8e342017-05-03 16:28:34 +0200739 }
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +0200740
741 list_len = ( buf[0] << 8 ) | buf[1];
742 if( list_len != len - 2 )
Gilles Peskine1cc8e342017-05-03 16:28:34 +0200743 {
744 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
745 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +0100746 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Gilles Peskine1cc8e342017-05-03 16:28:34 +0200747 }
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +0200748
749 /*
Manuel Pégourié-Gonnard239987f2018-01-09 10:43:43 +0100750 * Validate peer's list (lengths)
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +0200751 */
752 start = buf + 2;
753 end = buf + len;
Manuel Pégourié-Gonnard239987f2018-01-09 10:43:43 +0100754 for( theirs = start; theirs != end; theirs += cur_len )
755 {
756 cur_len = *theirs++;
757
758 /* Current identifier must fit in list */
759 if( cur_len > (size_t)( end - theirs ) )
760 {
761 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
762 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +0100763 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Manuel Pégourié-Gonnard239987f2018-01-09 10:43:43 +0100764 }
765
766 /* Empty strings MUST NOT be included */
767 if( cur_len == 0 )
768 {
769 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
770 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
Hanno Becker90d59dd2021-06-24 11:17:13 +0100771 return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
Manuel Pégourié-Gonnard239987f2018-01-09 10:43:43 +0100772 }
773 }
774
775 /*
776 * Use our order of preference
777 */
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +0200778 for( ours = ssl->conf->alpn_list; *ours != NULL; ours++ )
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +0200779 {
Paul Bakker14b16c62014-05-28 11:33:54 +0200780 ours_len = strlen( *ours );
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +0200781 for( theirs = start; theirs != end; theirs += cur_len )
782 {
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +0200783 cur_len = *theirs++;
784
Paul Bakker14b16c62014-05-28 11:33:54 +0200785 if( cur_len == ours_len &&
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +0200786 memcmp( theirs, *ours, cur_len ) == 0 )
787 {
788 ssl->alpn_chosen = *ours;
789 return( 0 );
790 }
791 }
792 }
793
794 /* If we get there, no match was found */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200795 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
796 MBEDTLS_SSL_ALERT_MSG_NO_APPLICATION_PROTOCOL );
Dave Rodgman53c86892021-06-29 10:02:06 +0100797 return( MBEDTLS_ERR_SSL_NO_APPLICATION_PROTOCOL );
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +0200798}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200799#endif /* MBEDTLS_SSL_ALPN */
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +0200800
Johan Pascalb62bb512015-12-03 21:56:45 +0100801#if defined(MBEDTLS_SSL_DTLS_SRTP)
802static int ssl_parse_use_srtp_ext( mbedtls_ssl_context *ssl,
Ron Eldoref72faf2018-07-12 11:54:20 +0300803 const unsigned char *buf,
804 size_t len )
Johan Pascalb62bb512015-12-03 21:56:45 +0100805{
Johan Pascal43f94902020-09-22 12:25:52 +0200806 mbedtls_ssl_srtp_profile client_protection = MBEDTLS_TLS_SRTP_UNSET;
Johan Pascalb62bb512015-12-03 21:56:45 +0100807 size_t i,j;
Johan Pascalf6417ec2020-09-22 15:15:19 +0200808 size_t profile_length;
809 uint16_t mki_length;
Ron Eldor313d7b52018-12-10 14:56:21 +0200810 /*! 2 bytes for profile length and 1 byte for mki len */
811 const size_t size_of_lengths = 3;
Johan Pascalb62bb512015-12-03 21:56:45 +0100812
813 /* If use_srtp is not configured, just ignore the extension */
Johan Pascalc3ccd982020-10-28 17:18:18 +0100814 if( ( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ) ||
815 ( ssl->conf->dtls_srtp_profile_list == NULL ) ||
816 ( ssl->conf->dtls_srtp_profile_list_len == 0 ) )
Johan Pascal85269572020-08-25 10:01:54 +0200817 {
Johan Pascalb62bb512015-12-03 21:56:45 +0100818 return( 0 );
Johan Pascal85269572020-08-25 10:01:54 +0200819 }
Johan Pascalb62bb512015-12-03 21:56:45 +0100820
821 /* RFC5764 section 4.1.1
822 * uint8 SRTPProtectionProfile[2];
823 *
824 * struct {
825 * SRTPProtectionProfiles SRTPProtectionProfiles;
826 * opaque srtp_mki<0..255>;
827 * } UseSRTPData;
828
829 * SRTPProtectionProfile SRTPProtectionProfiles<2..2^16-1>;
Johan Pascalb62bb512015-12-03 21:56:45 +0100830 */
831
Ron Eldoref72faf2018-07-12 11:54:20 +0300832 /*
833 * Min length is 5: at least one protection profile(2 bytes)
834 * and length(2 bytes) + srtp_mki length(1 byte)
Johan Pascal042d4562020-08-25 12:14:02 +0200835 * Check here that we have at least 2 bytes of protection profiles length
Johan Pascal76fdf1d2020-10-22 23:31:00 +0200836 * and one of srtp_mki length
Ron Eldoref72faf2018-07-12 11:54:20 +0300837 */
Johan Pascal76fdf1d2020-10-22 23:31:00 +0200838 if( len < size_of_lengths )
Ron Eldor313d7b52018-12-10 14:56:21 +0200839 {
840 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
Hanno Becker90d59dd2021-06-24 11:17:13 +0100841 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
842 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Ron Eldor313d7b52018-12-10 14:56:21 +0200843 }
Johan Pascalb62bb512015-12-03 21:56:45 +0100844
Johan Pascal43f94902020-09-22 12:25:52 +0200845 ssl->dtls_srtp_info.chosen_dtls_srtp_profile = MBEDTLS_TLS_SRTP_UNSET;
Ron Eldor591f1622018-01-22 12:30:04 +0200846
Ron Eldoref72faf2018-07-12 11:54:20 +0300847 /* first 2 bytes are protection profile length(in bytes) */
848 profile_length = ( buf[0] << 8 ) | buf[1];
Johan Pascal042d4562020-08-25 12:14:02 +0200849 buf += 2;
Ron Eldor591f1622018-01-22 12:30:04 +0200850
Johan Pascal76fdf1d2020-10-22 23:31:00 +0200851 /* The profile length cannot be bigger than input buffer size - lengths fields */
852 if( profile_length > len - size_of_lengths ||
Johan Pascal042d4562020-08-25 12:14:02 +0200853 profile_length % 2 != 0 ) /* profiles are 2 bytes long, so the length must be even */
Ron Eldor313d7b52018-12-10 14:56:21 +0200854 {
855 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
Hanno Becker90d59dd2021-06-24 11:17:13 +0100856 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
857 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Ron Eldor313d7b52018-12-10 14:56:21 +0200858 }
Ron Eldoref72faf2018-07-12 11:54:20 +0300859 /*
860 * parse the extension list values are defined in
861 * http://www.iana.org/assignments/srtp-protection/srtp-protection.xhtml
862 */
Johan Pascal76fdf1d2020-10-22 23:31:00 +0200863 for( j = 0; j < profile_length; j += 2 )
Johan Pascalb62bb512015-12-03 21:56:45 +0100864 {
Johan Pascal76fdf1d2020-10-22 23:31:00 +0200865 uint16_t protection_profile_value = buf[j] << 8 | buf[j + 1];
Johan Pascal43f94902020-09-22 12:25:52 +0200866 client_protection = mbedtls_ssl_check_srtp_profile_value( protection_profile_value );
Johan Pascalb62bb512015-12-03 21:56:45 +0100867
Johan Pascal43f94902020-09-22 12:25:52 +0200868 if( client_protection != MBEDTLS_TLS_SRTP_UNSET )
Ron Eldorb4655392018-07-05 18:25:39 +0300869 {
Johan Pascal43f94902020-09-22 12:25:52 +0200870 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found srtp profile: %s",
871 mbedtls_ssl_get_srtp_profile_as_string(
872 client_protection ) ) );
Ron Eldorb4655392018-07-05 18:25:39 +0300873 }
Johan Pascal85269572020-08-25 10:01:54 +0200874 else
875 {
876 continue;
877 }
Ron Eldor591f1622018-01-22 12:30:04 +0200878 /* check if suggested profile is in our list */
Ron Eldora9788042018-12-05 11:04:31 +0200879 for( i = 0; i < ssl->conf->dtls_srtp_profile_list_len; i++)
Ron Eldor591f1622018-01-22 12:30:04 +0200880 {
881 if( client_protection == ssl->conf->dtls_srtp_profile_list[i] )
882 {
Ron Eldor3adb9922017-12-21 10:15:08 +0200883 ssl->dtls_srtp_info.chosen_dtls_srtp_profile = ssl->conf->dtls_srtp_profile_list[i];
Johan Pascal43f94902020-09-22 12:25:52 +0200884 MBEDTLS_SSL_DEBUG_MSG( 3, ( "selected srtp profile: %s",
885 mbedtls_ssl_get_srtp_profile_as_string(
886 client_protection ) ) );
Ron Eldor591f1622018-01-22 12:30:04 +0200887 break;
Johan Pascalb62bb512015-12-03 21:56:45 +0100888 }
889 }
Johan Pascal43f94902020-09-22 12:25:52 +0200890 if( ssl->dtls_srtp_info.chosen_dtls_srtp_profile != MBEDTLS_TLS_SRTP_UNSET )
Ron Eldor591f1622018-01-22 12:30:04 +0200891 break;
892 }
Johan Pascal042d4562020-08-25 12:14:02 +0200893 buf += profile_length; /* buf points to the mki length */
894 mki_length = *buf;
895 buf++;
Ron Eldor591f1622018-01-22 12:30:04 +0200896
Johan Pascal042d4562020-08-25 12:14:02 +0200897 if( mki_length > MBEDTLS_TLS_SRTP_MAX_MKI_LENGTH ||
898 mki_length + profile_length + size_of_lengths != len )
899 {
900 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
Hanno Becker90d59dd2021-06-24 11:17:13 +0100901 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
902 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Johan Pascal042d4562020-08-25 12:14:02 +0200903 }
904
905 /* Parse the mki only if present and mki is supported locally */
906 if( ssl->conf->dtls_srtp_mki_support == MBEDTLS_SSL_DTLS_SRTP_MKI_SUPPORTED &&
907 mki_length > 0 )
908 {
909 ssl->dtls_srtp_info.mki_len = mki_length;
910
Johan Pascal5ef72d22020-10-28 17:05:47 +0100911 memcpy( ssl->dtls_srtp_info.mki_value, buf, mki_length );
Ron Eldorb4655392018-07-05 18:25:39 +0300912
Ron Eldoref72faf2018-07-12 11:54:20 +0300913 MBEDTLS_SSL_DEBUG_BUF( 3, "using mki", ssl->dtls_srtp_info.mki_value,
914 ssl->dtls_srtp_info.mki_len );
Johan Pascalb62bb512015-12-03 21:56:45 +0100915 }
916
Johan Pascal042d4562020-08-25 12:14:02 +0200917 return( 0 );
Johan Pascalb62bb512015-12-03 21:56:45 +0100918}
919#endif /* MBEDTLS_SSL_DTLS_SRTP */
920
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +0100921/*
922 * Auxiliary functions for ServerHello parsing and related actions
923 */
924
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200925#if defined(MBEDTLS_X509_CRT_PARSE_C)
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +0100926/*
Manuel Pégourié-Gonnard6458e3b2015-01-08 14:16:56 +0100927 * Return 0 if the given key uses one of the acceptable curves, -1 otherwise
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +0100928 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200929#if defined(MBEDTLS_ECDSA_C)
930static int ssl_check_key_curve( mbedtls_pk_context *pk,
931 const mbedtls_ecp_curve_info **curves )
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +0100932{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200933 const mbedtls_ecp_curve_info **crv = curves;
934 mbedtls_ecp_group_id grp_id = mbedtls_pk_ec( *pk )->grp.id;
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +0100935
936 while( *crv != NULL )
937 {
938 if( (*crv)->grp_id == grp_id )
Manuel Pégourié-Gonnard6458e3b2015-01-08 14:16:56 +0100939 return( 0 );
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +0100940 crv++;
941 }
942
Manuel Pégourié-Gonnard6458e3b2015-01-08 14:16:56 +0100943 return( -1 );
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +0100944}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200945#endif /* MBEDTLS_ECDSA_C */
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +0100946
947/*
948 * Try picking a certificate for this ciphersuite,
949 * return 0 on success and -1 on failure.
950 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200951static int ssl_pick_cert( mbedtls_ssl_context *ssl,
952 const mbedtls_ssl_ciphersuite_t * ciphersuite_info )
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +0100953{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200954 mbedtls_ssl_key_cert *cur, *list, *fallback = NULL;
Hanno Becker0d0cd4b2017-05-11 14:06:43 +0100955 mbedtls_pk_type_t pk_alg =
956 mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
Manuel Pégourié-Gonnarde6ef16f2015-05-11 19:54:43 +0200957 uint32_t flags;
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +0100958
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200959#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +0100960 if( ssl->handshake->sni_key_cert != NULL )
961 list = ssl->handshake->sni_key_cert;
962 else
963#endif
Manuel Pégourié-Gonnard8f618a82015-05-10 21:13:36 +0200964 list = ssl->conf->key_cert;
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +0100965
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200966 if( pk_alg == MBEDTLS_PK_NONE )
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +0100967 return( 0 );
968
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200969 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite requires certificate" ) );
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +0000970
Manuel Pégourié-Gonnarde540b492015-07-07 12:44:38 +0200971 if( list == NULL )
972 {
973 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server has no certificate" ) );
974 return( -1 );
975 }
976
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +0100977 for( cur = list; cur != NULL; cur = cur->next )
978 {
Andrzej Kurek7ed01e82020-03-18 11:51:59 -0400979 flags = 0;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200980 MBEDTLS_SSL_DEBUG_CRT( 3, "candidate certificate chain, certificate",
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +0000981 cur->cert );
982
Gilles Peskinee198df52018-01-05 21:17:45 +0100983 if( ! mbedtls_pk_can_do( &cur->cert->pk, pk_alg ) )
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +0000984 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200985 MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: key type" ) );
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +0100986 continue;
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +0000987 }
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +0100988
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +0200989 /*
990 * This avoids sending the client a cert it'll reject based on
991 * keyUsage or other extensions.
992 *
993 * It also allows the user to provision different certificates for
994 * different uses based on keyUsage, eg if they want to avoid signing
995 * and decrypting with the same RSA key.
996 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200997 if( mbedtls_ssl_check_cert_usage( cur->cert, ciphersuite_info,
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +0100998 MBEDTLS_SSL_IS_SERVER, &flags ) != 0 )
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +0200999 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001000 MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: "
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +00001001 "(extended) key usage extension" ) );
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02001002 continue;
1003 }
1004
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001005#if defined(MBEDTLS_ECDSA_C)
1006 if( pk_alg == MBEDTLS_PK_ECDSA &&
Gilles Peskine81d4e892017-10-27 10:18:44 +02001007 ssl_check_key_curve( &cur->cert->pk, ssl->handshake->curves ) != 0 )
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +00001008 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001009 MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: elliptic curve" ) );
Manuel Pégourié-Gonnard846ba472015-01-08 13:54:38 +01001010 continue;
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +00001011 }
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001012#endif
Manuel Pégourié-Gonnard846ba472015-01-08 13:54:38 +01001013
1014 /* If we get there, we got a winner */
1015 break;
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001016 }
1017
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +00001018 if( cur == NULL )
1019 cur = fallback;
1020
Manuel Pégourié-Gonnard8f618a82015-05-10 21:13:36 +02001021 /* Do not update ssl->handshake->key_cert unless there is a match */
Manuel Pégourié-Gonnarddf331a52015-01-08 16:43:07 +01001022 if( cur != NULL )
1023 {
1024 ssl->handshake->key_cert = cur;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001025 MBEDTLS_SSL_DEBUG_CRT( 3, "selected certificate chain, certificate",
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +00001026 ssl->handshake->key_cert->cert );
Manuel Pégourié-Gonnarddf331a52015-01-08 16:43:07 +01001027 return( 0 );
1028 }
1029
1030 return( -1 );
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001031}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001032#endif /* MBEDTLS_X509_CRT_PARSE_C */
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001033
1034/*
1035 * Check if a given ciphersuite is suitable for use with our config/keys/etc
1036 * Sets ciphersuite_info only if the suite matches.
1037 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001038static int ssl_ciphersuite_match( mbedtls_ssl_context *ssl, int suite_id,
1039 const mbedtls_ssl_ciphersuite_t **ciphersuite_info )
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001040{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001041 const mbedtls_ssl_ciphersuite_t *suite_info;
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001042
Jerry Yue7541932022-01-28 10:21:24 +08001043#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
Hanno Becker7e5437a2017-04-28 17:15:26 +01001044 mbedtls_pk_type_t sig_type;
1045#endif
1046
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001047 suite_info = mbedtls_ssl_ciphersuite_from_id( suite_id );
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001048 if( suite_info == NULL )
1049 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001050 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1051 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001052 }
1053
Hanno Becker5c5efdf2019-01-28 14:59:35 +00001054 MBEDTLS_SSL_DEBUG_MSG( 3, ( "trying ciphersuite: %#04x (%s)",
Paul Elliott3891caf2020-12-17 18:42:40 +00001055 (unsigned int) suite_id, suite_info->name ) );
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +00001056
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001057 if( suite_info->min_minor_ver > ssl->minor_ver ||
1058 suite_info->max_minor_ver < ssl->minor_ver )
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +00001059 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001060 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: version" ) );
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001061 return( 0 );
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +00001062 }
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001063
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001064#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001065 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001066 ( suite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) )
Manuel Pégourié-Gonnardd6664512014-02-06 13:26:57 +01001067 return( 0 );
1068#endif
1069
Manuel Pégourié-Gonnarde511b4e2015-09-16 14:11:09 +02001070#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
1071 if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE &&
Manuel Pégourié-Gonnardbf57be62015-09-16 15:04:01 +02001072 ( ssl->handshake->cli_exts & MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK ) == 0 )
Manuel Pégourié-Gonnarde511b4e2015-09-16 14:11:09 +02001073 {
Manuel Pégourié-Gonnardbf57be62015-09-16 15:04:01 +02001074 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: ecjpake "
1075 "not configured or ext missing" ) );
Manuel Pégourié-Gonnarde511b4e2015-09-16 14:11:09 +02001076 return( 0 );
1077 }
1078#endif
1079
1080
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001081#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
1082 if( mbedtls_ssl_ciphersuite_uses_ec( suite_info ) &&
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001083 ( ssl->handshake->curves == NULL ||
1084 ssl->handshake->curves[0] == NULL ) )
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +00001085 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001086 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: "
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +00001087 "no common elliptic curve" ) );
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001088 return( 0 );
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +00001089 }
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001090#endif
1091
Gilles Peskineeccd8882020-03-10 12:19:08 +01001092#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001093 /* If the ciphersuite requires a pre-shared key and we don't
1094 * have one, skip it now rather than failing later */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001095 if( mbedtls_ssl_ciphersuite_uses_psk( suite_info ) &&
Hanno Becker845b9462018-10-26 12:07:29 +01001096 ssl_conf_has_psk_or_cb( ssl->conf ) == 0 )
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +00001097 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001098 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no pre-shared key" ) );
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001099 return( 0 );
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +00001100 }
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001101#endif
1102
Jerry Yue7541932022-01-28 10:21:24 +08001103#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
Hanno Becker7e5437a2017-04-28 17:15:26 +01001104 /* If the ciphersuite requires signing, check whether
1105 * a suitable hash algorithm is present. */
1106 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
1107 {
1108 sig_type = mbedtls_ssl_get_ciphersuite_sig_alg( suite_info );
1109 if( sig_type != MBEDTLS_PK_NONE &&
1110 mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs, sig_type ) == MBEDTLS_MD_NONE )
1111 {
1112 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no suitable hash algorithm "
Paul Elliott3891caf2020-12-17 18:42:40 +00001113 "for signature algorithm %u", (unsigned) sig_type ) );
Hanno Becker7e5437a2017-04-28 17:15:26 +01001114 return( 0 );
1115 }
1116 }
1117
Jerry Yue7541932022-01-28 10:21:24 +08001118#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
Hanno Becker7e5437a2017-04-28 17:15:26 +01001119
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001120#if defined(MBEDTLS_X509_CRT_PARSE_C)
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001121 /*
1122 * Final check: if ciphersuite requires us to have a
1123 * certificate/key of a particular type:
1124 * - select the appropriate certificate if we have one, or
1125 * - try the next ciphersuite if we don't
1126 * This must be done last since we modify the key_cert list.
1127 */
1128 if( ssl_pick_cert( ssl, suite_info ) != 0 )
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +00001129 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001130 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: "
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +00001131 "no suitable certificate" ) );
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001132 return( 0 );
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +00001133 }
Manuel Pégourié-Gonnard32525602013-11-30 17:50:32 +01001134#endif
1135
1136 *ciphersuite_info = suite_info;
1137 return( 0 );
1138}
1139
Gilles Peskine1cc8e342017-05-03 16:28:34 +02001140/* This function doesn't alert on errors that happen early during
1141 ClientHello parsing because they might indicate that the client is
1142 not talking SSL/TLS at all and would not understand our alert. */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001143static int ssl_parse_client_hello( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00001144{
Manuel Pégourié-Gonnardf01768c2015-01-08 17:06:16 +01001145 int ret, got_common_suite;
Manuel Pégourié-Gonnard9de64f52015-07-01 15:51:43 +02001146 size_t i, j;
1147 size_t ciph_offset, comp_offset, ext_offset;
1148 size_t msg_len, ciph_len, sess_len, comp_len, ext_len;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001149#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard9de64f52015-07-01 15:51:43 +02001150 size_t cookie_offset, cookie_len;
Manuel Pégourié-Gonnard4128aa72014-03-21 09:40:12 +01001151#endif
Paul Bakker48916f92012-09-16 19:57:18 +00001152 unsigned char *buf, *p, *ext;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001153#if defined(MBEDTLS_SSL_RENEGOTIATION)
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00001154 int renegotiation_info_seen = 0;
Manuel Pégourié-Gonnardeaecbd32014-11-06 02:38:02 +01001155#endif
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00001156 int handshake_failure = 0;
Paul Bakker8f4ddae2013-04-15 15:09:54 +02001157 const int *ciphersuites;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001158 const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01001159 int major, minor;
Paul Bakker5121ce52009-01-03 21:22:43 +00001160
Hanno Becker7e5437a2017-04-28 17:15:26 +01001161 /* If there is no signature-algorithm extension present,
1162 * we need to fall back to the default values for allowed
1163 * signature-hash pairs. */
Jerry Yue7541932022-01-28 10:21:24 +08001164#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
Hanno Becker7e5437a2017-04-28 17:15:26 +01001165 int sig_hash_alg_ext_present = 0;
Jerry Yue7541932022-01-28 10:21:24 +08001166#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
Hanno Becker7e5437a2017-04-28 17:15:26 +01001167
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001168 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00001169
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001170#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
Manuel Pégourié-Gonnardf03c7aa2014-09-24 14:54:06 +02001171read_record_header:
1172#endif
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001173 /*
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001174 * If renegotiating, then the input was read with mbedtls_ssl_read_record(),
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001175 * otherwise read it ourselves manually in order to support SSLv2
1176 * ClientHello, which doesn't use the same record layer format.
1177 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001178#if defined(MBEDTLS_SSL_RENEGOTIATION)
1179 if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01001180#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00001181 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001182 if( ( ret = mbedtls_ssl_fetch_input( ssl, 5 ) ) != 0 )
Manuel Pégourié-Gonnard59c6f2e2015-01-22 11:06:40 +00001183 {
Gilles Peskine1cc8e342017-05-03 16:28:34 +02001184 /* No alert on a read error. */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001185 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
Manuel Pégourié-Gonnard59c6f2e2015-01-22 11:06:40 +00001186 return( ret );
1187 }
Paul Bakker5121ce52009-01-03 21:22:43 +00001188 }
1189
1190 buf = ssl->in_hdr;
1191
Hanno Becker5903de42019-05-03 14:46:38 +01001192 MBEDTLS_SSL_DEBUG_BUF( 4, "record header", buf, mbedtls_ssl_in_hdr_len( ssl ) );
Paul Bakkerec636f32012-09-09 19:17:02 +00001193
Paul Bakkerec636f32012-09-09 19:17:02 +00001194 /*
Mateusz Starzyk06b07fb2021-02-18 13:55:21 +01001195 * TLS Client Hello
Paul Bakkerec636f32012-09-09 19:17:02 +00001196 *
1197 * Record layer:
1198 * 0 . 0 message type
1199 * 1 . 2 protocol version
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02001200 * 3 . 11 DTLS: epoch + record sequence number
Paul Bakkerec636f32012-09-09 19:17:02 +00001201 * 3 . 4 message length
1202 */
Mateusz Starzyk06b07fb2021-02-18 13:55:21 +01001203 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, message type: %d",
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001204 buf[0] ) );
1205
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001206 if( buf[0] != MBEDTLS_SSL_MSG_HANDSHAKE )
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01001207 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001208 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001209 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01001210 }
1211
Mateusz Starzyk06b07fb2021-02-18 13:55:21 +01001212 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, message len.: %d",
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001213 ( ssl->in_len[0] << 8 ) | ssl->in_len[1] ) );
1214
Mateusz Starzyk06b07fb2021-02-18 13:55:21 +01001215 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, protocol version: [%d:%d]",
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001216 buf[1], buf[2] ) );
1217
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001218 mbedtls_ssl_read_version( &major, &minor, ssl->conf->transport, buf + 1 );
Manuel Pégourié-Gonnard6b1e2072014-02-12 10:14:54 +01001219
1220 /* According to RFC 5246 Appendix E.1, the version here is typically
1221 * "{03,00}, the lowest version number supported by the client, [or] the
1222 * value of ClientHello.client_version", so the only meaningful check here
1223 * is the major version shouldn't be less than 3 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001224 if( major < MBEDTLS_SSL_MAJOR_VERSION_3 )
Paul Bakker5121ce52009-01-03 21:22:43 +00001225 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001226 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001227 return( MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION );
Paul Bakkerec636f32012-09-09 19:17:02 +00001228 }
Paul Bakker5121ce52009-01-03 21:22:43 +00001229
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02001230 /* For DTLS if this is the initial handshake, remember the client sequence
1231 * number to use it in our next message (RFC 6347 4.2.1) */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001232#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001233 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001234#if defined(MBEDTLS_SSL_RENEGOTIATION)
1235 && ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE
Manuel Pégourié-Gonnard3a173f42015-01-22 13:30:33 +00001236#endif
1237 )
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02001238 {
1239 /* Epoch should be 0 for initial handshakes */
1240 if( ssl->in_ctr[0] != 0 || ssl->in_ctr[1] != 0 )
1241 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001242 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001243 return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02001244 }
1245
Jerry Yud9a94fe2021-09-28 18:58:59 +08001246 memcpy( &ssl->cur_out_ctr[2], ssl->in_ctr + 2,
Jerry Yud96a5c22021-09-29 17:46:51 +08001247 sizeof( ssl->cur_out_ctr ) - 2 );
Manuel Pégourié-Gonnardf03c7aa2014-09-24 14:54:06 +02001248
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001249#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
1250 if( mbedtls_ssl_dtls_replay_check( ssl ) != 0 )
Manuel Pégourié-Gonnardf03c7aa2014-09-24 14:54:06 +02001251 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001252 MBEDTLS_SSL_DEBUG_MSG( 1, ( "replayed record, discarding" ) );
Manuel Pégourié-Gonnardf03c7aa2014-09-24 14:54:06 +02001253 ssl->next_record_offset = 0;
1254 ssl->in_left = 0;
1255 goto read_record_header;
1256 }
1257
1258 /* No MAC to check yet, so we can update right now */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001259 mbedtls_ssl_dtls_replay_update( ssl );
Manuel Pégourié-Gonnardf03c7aa2014-09-24 14:54:06 +02001260#endif
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02001261 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001262#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02001263
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001264 msg_len = ( ssl->in_len[0] << 8 ) | ssl->in_len[1];
Paul Bakker5121ce52009-01-03 21:22:43 +00001265
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001266#if defined(MBEDTLS_SSL_RENEGOTIATION)
1267 if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
Manuel Pégourié-Gonnardb89c4f32015-01-21 13:24:10 +00001268 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001269 /* Set by mbedtls_ssl_read_record() */
Manuel Pégourié-Gonnardb89c4f32015-01-21 13:24:10 +00001270 msg_len = ssl->in_hslen;
1271 }
1272 else
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01001273#endif
Paul Bakkerec636f32012-09-09 19:17:02 +00001274 {
Angus Grattond8213d02016-05-25 20:56:48 +10001275 if( msg_len > MBEDTLS_SSL_IN_CONTENT_LEN )
Manuel Pégourié-Gonnardd6b721c2014-03-24 12:13:54 +01001276 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001277 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001278 return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
Manuel Pégourié-Gonnardd6b721c2014-03-24 12:13:54 +01001279 }
Paul Bakkerec636f32012-09-09 19:17:02 +00001280
Hanno Becker0d0cd4b2017-05-11 14:06:43 +01001281 if( ( ret = mbedtls_ssl_fetch_input( ssl,
Hanno Becker5903de42019-05-03 14:46:38 +01001282 mbedtls_ssl_in_hdr_len( ssl ) + msg_len ) ) != 0 )
Manuel Pégourié-Gonnardd6b721c2014-03-24 12:13:54 +01001283 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001284 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
Manuel Pégourié-Gonnardd6b721c2014-03-24 12:13:54 +01001285 return( ret );
1286 }
Manuel Pégourié-Gonnard30d16eb2014-08-19 17:43:50 +02001287
1288 /* Done reading this record, get ready for the next one */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001289#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001290 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Hanno Becker5903de42019-05-03 14:46:38 +01001291 ssl->next_record_offset = msg_len + mbedtls_ssl_in_hdr_len( ssl );
Manuel Pégourié-Gonnard30d16eb2014-08-19 17:43:50 +02001292 else
1293#endif
1294 ssl->in_left = 0;
Manuel Pégourié-Gonnardd6b721c2014-03-24 12:13:54 +01001295 }
Paul Bakkerec636f32012-09-09 19:17:02 +00001296
1297 buf = ssl->in_msg;
Paul Bakkerec636f32012-09-09 19:17:02 +00001298
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001299 MBEDTLS_SSL_DEBUG_BUF( 4, "record contents", buf, msg_len );
Manuel Pégourié-Gonnarde89bcf02014-02-18 18:50:02 +01001300
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001301 ssl->handshake->update_checksum( ssl, buf, msg_len );
Paul Bakkerec636f32012-09-09 19:17:02 +00001302
1303 /*
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001304 * Handshake layer:
1305 * 0 . 0 handshake type
1306 * 1 . 3 handshake length
1307 * 4 . 5 DTLS only: message seqence number
1308 * 6 . 8 DTLS only: fragment offset
1309 * 9 . 11 DTLS only: fragment length
Manuel Pégourié-Gonnardce441b32014-02-18 17:40:52 +01001310 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001311 if( msg_len < mbedtls_ssl_hs_hdr_len( ssl ) )
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001312 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001313 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001314 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001315 }
1316
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001317 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, handshake type: %d", buf[0] ) );
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001318
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001319 if( buf[0] != MBEDTLS_SSL_HS_CLIENT_HELLO )
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001320 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001321 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001322 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001323 }
1324
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001325 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, handshake len.: %d",
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001326 ( buf[1] << 16 ) | ( buf[2] << 8 ) | buf[3] ) );
1327
1328 /* We don't support fragmentation of ClientHello (yet?) */
1329 if( buf[1] != 0 ||
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001330 msg_len != mbedtls_ssl_hs_hdr_len( ssl ) + ( ( buf[2] << 8 ) | buf[3] ) )
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001331 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001332 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001333 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001334 }
1335
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001336#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001337 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnardce441b32014-02-18 17:40:52 +01001338 {
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02001339 /*
Manuel Pégourié-Gonnard69849f82015-03-10 11:54:02 +00001340 * Copy the client's handshake message_seq on initial handshakes,
1341 * check sequence number on renego.
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02001342 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001343#if defined(MBEDTLS_SSL_RENEGOTIATION)
1344 if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02001345 {
1346 /* This couldn't be done in ssl_prepare_handshake_record() */
1347 unsigned int cli_msg_seq = ( ssl->in_msg[4] << 8 ) |
1348 ssl->in_msg[5];
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02001349
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02001350 if( cli_msg_seq != ssl->handshake->in_msg_seq )
1351 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001352 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message_seq: "
Paul Elliott9f352112020-12-09 14:55:45 +00001353 "%u (expected %u)", cli_msg_seq,
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02001354 ssl->handshake->in_msg_seq ) );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001355 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02001356 }
1357
1358 ssl->handshake->in_msg_seq++;
1359 }
Manuel Pégourié-Gonnard69849f82015-03-10 11:54:02 +00001360 else
1361#endif
1362 {
1363 unsigned int cli_msg_seq = ( ssl->in_msg[4] << 8 ) |
1364 ssl->in_msg[5];
1365 ssl->handshake->out_msg_seq = cli_msg_seq;
1366 ssl->handshake->in_msg_seq = cli_msg_seq + 1;
1367 }
Manuel Pégourié-Gonnarde89bcf02014-02-18 18:50:02 +01001368
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001369 /*
1370 * For now we don't support fragmentation, so make sure
1371 * fragment_offset == 0 and fragment_length == length
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001372 */
Manuel Pégourié-Gonnarde89bcf02014-02-18 18:50:02 +01001373 if( ssl->in_msg[6] != 0 || ssl->in_msg[7] != 0 || ssl->in_msg[8] != 0 ||
1374 memcmp( ssl->in_msg + 1, ssl->in_msg + 9, 3 ) != 0 )
1375 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001376 MBEDTLS_SSL_DEBUG_MSG( 1, ( "ClientHello fragmentation not supported" ) );
1377 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
Manuel Pégourié-Gonnarde89bcf02014-02-18 18:50:02 +01001378 }
Manuel Pégourié-Gonnardce441b32014-02-18 17:40:52 +01001379 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001380#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnardce441b32014-02-18 17:40:52 +01001381
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001382 buf += mbedtls_ssl_hs_hdr_len( ssl );
1383 msg_len -= mbedtls_ssl_hs_hdr_len( ssl );
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001384
Manuel Pégourié-Gonnardce441b32014-02-18 17:40:52 +01001385 /*
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001386 * ClientHello layer:
1387 * 0 . 1 protocol version
1388 * 2 . 33 random bytes (starting with 4 bytes of Unix time)
1389 * 34 . 35 session id length (1 byte)
1390 * 35 . 34+x session id
1391 * 35+x . 35+x DTLS only: cookie length (1 byte)
1392 * 36+x . .. DTLS only: cookie
Manuel Pégourié-Gonnard4128aa72014-03-21 09:40:12 +01001393 * .. . .. ciphersuite list length (2 bytes)
1394 * .. . .. ciphersuite list
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001395 * .. . .. compression alg. list length (1 byte)
1396 * .. . .. compression alg. list
1397 * .. . .. extensions length (2 bytes, optional)
1398 * .. . .. extensions (optional)
Paul Bakkerec636f32012-09-09 19:17:02 +00001399 */
Paul Bakkerec636f32012-09-09 19:17:02 +00001400
1401 /*
Antonin Décimo36e89b52019-01-23 15:24:37 +01001402 * Minimal length (with everything empty and extensions omitted) is
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001403 * 2 + 32 + 1 + 2 + 1 = 38 bytes. Check that first, so that we can
1404 * read at least up to session id length without worrying.
Paul Bakkerec636f32012-09-09 19:17:02 +00001405 */
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001406 if( msg_len < 38 )
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001407 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001408 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001409 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001410 }
1411
1412 /*
1413 * Check and save the protocol version
1414 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001415 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, version", buf, 2 );
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001416
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001417 mbedtls_ssl_read_version( &ssl->major_ver, &ssl->minor_ver,
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001418 ssl->conf->transport, buf );
Hanno Beckerfadbdbb2021-07-23 06:25:48 +01001419 ssl->session_negotiate->minor_ver = ssl->minor_ver;
Paul Bakkerec636f32012-09-09 19:17:02 +00001420
Manuel Pégourié-Gonnard6b1e2072014-02-12 10:14:54 +01001421 ssl->handshake->max_major_ver = ssl->major_ver;
1422 ssl->handshake->max_minor_ver = ssl->minor_ver;
1423
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001424 if( ssl->major_ver < ssl->conf->min_major_ver ||
1425 ssl->minor_ver < ssl->conf->min_minor_ver )
Paul Bakker1d29fb52012-09-28 13:28:45 +00001426 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001427 MBEDTLS_SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum"
Manuel Pégourié-Gonnard6b1e2072014-02-12 10:14:54 +01001428 " [%d:%d] < [%d:%d]",
1429 ssl->major_ver, ssl->minor_ver,
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001430 ssl->conf->min_major_ver, ssl->conf->min_minor_ver ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001431 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
1432 MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
Hanno Beckerbc000442021-06-24 09:18:19 +01001433 return( MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION );
Paul Bakker1d29fb52012-09-28 13:28:45 +00001434 }
1435
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001436 if( ssl->major_ver > ssl->conf->max_major_ver )
Manuel Pégourié-Gonnard6b1e2072014-02-12 10:14:54 +01001437 {
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001438 ssl->major_ver = ssl->conf->max_major_ver;
1439 ssl->minor_ver = ssl->conf->max_minor_ver;
Manuel Pégourié-Gonnard6b1e2072014-02-12 10:14:54 +01001440 }
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001441 else if( ssl->minor_ver > ssl->conf->max_minor_ver )
1442 ssl->minor_ver = ssl->conf->max_minor_ver;
Paul Bakkerec636f32012-09-09 19:17:02 +00001443
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001444 /*
1445 * Save client random (inc. Unix time)
1446 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001447 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes", buf + 2, 32 );
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001448
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001449 memcpy( ssl->handshake->randbytes, buf + 2, 32 );
Paul Bakkerec636f32012-09-09 19:17:02 +00001450
1451 /*
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001452 * Check the session ID length and save session ID
Paul Bakkerec636f32012-09-09 19:17:02 +00001453 */
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001454 sess_len = buf[34];
Paul Bakkerec636f32012-09-09 19:17:02 +00001455
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001456 if( sess_len > sizeof( ssl->session_negotiate->id ) ||
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001457 sess_len + 34 + 2 > msg_len ) /* 2 for cipherlist length field */
Paul Bakkerec636f32012-09-09 19:17:02 +00001458 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001459 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02001460 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
1461 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001462 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakkerec636f32012-09-09 19:17:02 +00001463 }
1464
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001465 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", buf + 35, sess_len );
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001466
Manuel Pégourié-Gonnard12ad7982015-06-18 15:50:37 +02001467 ssl->session_negotiate->id_len = sess_len;
Paul Bakker48916f92012-09-16 19:57:18 +00001468 memset( ssl->session_negotiate->id, 0,
1469 sizeof( ssl->session_negotiate->id ) );
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001470 memcpy( ssl->session_negotiate->id, buf + 35,
Manuel Pégourié-Gonnard12ad7982015-06-18 15:50:37 +02001471 ssl->session_negotiate->id_len );
Paul Bakkerec636f32012-09-09 19:17:02 +00001472
1473 /*
Manuel Pégourié-Gonnard4128aa72014-03-21 09:40:12 +01001474 * Check the cookie length and content
1475 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001476#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001477 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard4128aa72014-03-21 09:40:12 +01001478 {
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001479 cookie_offset = 35 + sess_len;
Manuel Pégourié-Gonnard4128aa72014-03-21 09:40:12 +01001480 cookie_len = buf[cookie_offset];
1481
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02001482 if( cookie_offset + 1 + cookie_len + 2 > msg_len )
Manuel Pégourié-Gonnard4128aa72014-03-21 09:40:12 +01001483 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001484 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02001485 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
Hanno Becker90d59dd2021-06-24 11:17:13 +01001486 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
1487 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Manuel Pégourié-Gonnard4128aa72014-03-21 09:40:12 +01001488 }
1489
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001490 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, cookie",
Manuel Pégourié-Gonnard4128aa72014-03-21 09:40:12 +01001491 buf + cookie_offset + 1, cookie_len );
1492
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001493#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001494 if( ssl->conf->f_cookie_check != NULL
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001495#if defined(MBEDTLS_SSL_RENEGOTIATION)
1496 && ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE
Manuel Pégourié-Gonnard69849f82015-03-10 11:54:02 +00001497#endif
1498 )
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02001499 {
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001500 if( ssl->conf->f_cookie_check( ssl->conf->p_cookie,
Manuel Pégourié-Gonnard7d38d212014-07-23 17:52:09 +02001501 buf + cookie_offset + 1, cookie_len,
1502 ssl->cli_id, ssl->cli_id_len ) != 0 )
1503 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001504 MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification failed" ) );
Manuel Pégourié-Gonnard7d38d212014-07-23 17:52:09 +02001505 ssl->handshake->verify_cookie_len = 1;
1506 }
1507 else
1508 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001509 MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification passed" ) );
Manuel Pégourié-Gonnard7d38d212014-07-23 17:52:09 +02001510 ssl->handshake->verify_cookie_len = 0;
1511 }
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02001512 }
Manuel Pégourié-Gonnardd7f9bc52014-07-23 11:09:27 +02001513 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001514#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
Manuel Pégourié-Gonnard7d38d212014-07-23 17:52:09 +02001515 {
1516 /* We know we didn't send a cookie, so it should be empty */
1517 if( cookie_len != 0 )
1518 {
Gilles Peskine1cc8e342017-05-03 16:28:34 +02001519 /* This may be an attacker's probe, so don't send an alert */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001520 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001521 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Manuel Pégourié-Gonnard7d38d212014-07-23 17:52:09 +02001522 }
1523
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001524 MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification skipped" ) );
Manuel Pégourié-Gonnard7d38d212014-07-23 17:52:09 +02001525 }
Manuel Pégourié-Gonnard4128aa72014-03-21 09:40:12 +01001526
1527 /*
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001528 * Check the ciphersuitelist length (will be parsed later)
Paul Bakkerec636f32012-09-09 19:17:02 +00001529 */
Manuel Pégourié-Gonnard4128aa72014-03-21 09:40:12 +01001530 ciph_offset = cookie_offset + 1 + cookie_len;
Manuel Pégourié-Gonnarda06d7fe2015-03-13 10:36:55 +00001531 }
Manuel Pégourié-Gonnard4128aa72014-03-21 09:40:12 +01001532 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001533#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnard19d438f2014-09-09 17:08:52 +02001534 ciph_offset = 35 + sess_len;
Paul Bakkerec636f32012-09-09 19:17:02 +00001535
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001536 ciph_len = ( buf[ciph_offset + 0] << 8 )
1537 | ( buf[ciph_offset + 1] );
1538
1539 if( ciph_len < 2 ||
1540 ciph_len + 2 + ciph_offset + 1 > msg_len || /* 1 for comp. alg. len */
1541 ( ciph_len % 2 ) != 0 )
Paul Bakkerec636f32012-09-09 19:17:02 +00001542 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001543 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02001544 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
1545 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001546 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakkerec636f32012-09-09 19:17:02 +00001547 }
1548
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001549 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist",
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001550 buf + ciph_offset + 2, ciph_len );
Paul Bakkerec636f32012-09-09 19:17:02 +00001551
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001552 /*
1553 * Check the compression algorithms length and pick one
1554 */
1555 comp_offset = ciph_offset + 2 + ciph_len;
1556
1557 comp_len = buf[comp_offset];
1558
1559 if( comp_len < 1 ||
1560 comp_len > 16 ||
1561 comp_len + comp_offset + 1 > msg_len )
Paul Bakkerec636f32012-09-09 19:17:02 +00001562 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001563 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02001564 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
1565 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001566 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakkerec636f32012-09-09 19:17:02 +00001567 }
1568
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001569 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, compression",
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001570 buf + comp_offset + 1, comp_len );
Paul Bakker48916f92012-09-16 19:57:18 +00001571
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001572 ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL;
Manuel Pégourié-Gonnarda0e16322014-07-14 17:38:41 +02001573 /* See comments in ssl_write_client_hello() */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001574#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001575 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001576 ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL;
Manuel Pégourié-Gonnarda0e16322014-07-14 17:38:41 +02001577#endif
Simon Butcher584a5472016-05-23 16:24:52 +01001578 /*
1579 * Check the extension length
1580 */
1581 ext_offset = comp_offset + 1 + comp_len;
1582 if( msg_len > ext_offset )
Paul Bakker48916f92012-09-16 19:57:18 +00001583 {
Simon Butcher584a5472016-05-23 16:24:52 +01001584 if( msg_len < ext_offset + 2 )
1585 {
1586 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02001587 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
1588 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001589 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Simon Butcher584a5472016-05-23 16:24:52 +01001590 }
1591
1592 ext_len = ( buf[ext_offset + 0] << 8 )
1593 | ( buf[ext_offset + 1] );
1594
Glenn Strauss8a8a83b2021-02-02 02:21:23 -05001595 if( msg_len != ext_offset + 2 + ext_len )
Simon Butcher584a5472016-05-23 16:24:52 +01001596 {
1597 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02001598 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
1599 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001600 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Simon Butcher584a5472016-05-23 16:24:52 +01001601 }
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001602 }
Simon Butcher584a5472016-05-23 16:24:52 +01001603 else
1604 ext_len = 0;
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00001605
Simon Butcher584a5472016-05-23 16:24:52 +01001606 ext = buf + ext_offset + 2;
1607 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello extensions", ext, ext_len );
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00001608
Simon Butcher584a5472016-05-23 16:24:52 +01001609 while( ext_len != 0 )
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001610 {
Philippe Antoine747fd532018-05-30 09:13:21 +02001611 unsigned int ext_id;
1612 unsigned int ext_size;
1613 if ( ext_len < 4 ) {
1614 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
1615 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
1616 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001617 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Philippe Antoine747fd532018-05-30 09:13:21 +02001618 }
1619 ext_id = ( ( ext[0] << 8 ) | ( ext[1] ) );
1620 ext_size = ( ( ext[2] << 8 ) | ( ext[3] ) );
Paul Bakker48916f92012-09-16 19:57:18 +00001621
Simon Butcher584a5472016-05-23 16:24:52 +01001622 if( ext_size + 4 > ext_len )
1623 {
1624 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
Gilles Peskine1cc8e342017-05-03 16:28:34 +02001625 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
1626 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001627 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Simon Butcher584a5472016-05-23 16:24:52 +01001628 }
1629 switch( ext_id )
1630 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001631#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
Simon Butcher584a5472016-05-23 16:24:52 +01001632 case MBEDTLS_TLS_EXT_SERVERNAME:
1633 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ServerName extension" ) );
Simon Butcher584a5472016-05-23 16:24:52 +01001634 ret = ssl_parse_servername_ext( ssl, ext + 4, ext_size );
1635 if( ret != 0 )
1636 return( ret );
1637 break;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001638#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
Paul Bakker5701cdc2012-09-27 21:49:42 +00001639
Simon Butcher584a5472016-05-23 16:24:52 +01001640 case MBEDTLS_TLS_EXT_RENEGOTIATION_INFO:
1641 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001642#if defined(MBEDTLS_SSL_RENEGOTIATION)
Simon Butcher584a5472016-05-23 16:24:52 +01001643 renegotiation_info_seen = 1;
Manuel Pégourié-Gonnardeaecbd32014-11-06 02:38:02 +01001644#endif
Paul Bakker48916f92012-09-16 19:57:18 +00001645
Simon Butcher584a5472016-05-23 16:24:52 +01001646 ret = ssl_parse_renegotiation_info( ssl, ext + 4, ext_size );
1647 if( ret != 0 )
1648 return( ret );
1649 break;
Paul Bakker48916f92012-09-16 19:57:18 +00001650
Jerry Yue7541932022-01-28 10:21:24 +08001651#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
Simon Butcher584a5472016-05-23 16:24:52 +01001652 case MBEDTLS_TLS_EXT_SIG_ALG:
Ron Eldor73a38172017-10-03 15:58:26 +03001653 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found signature_algorithms extension" ) );
1654
Jerry Yu18cd4392021-12-17 17:44:24 +08001655 ret = ssl_parse_sig_alg_ext( ssl, ext + 4, ext_size );
Simon Butcher584a5472016-05-23 16:24:52 +01001656 if( ret != 0 )
1657 return( ret );
Hanno Becker7e5437a2017-04-28 17:15:26 +01001658
1659 sig_hash_alg_ext_present = 1;
Simon Butcher584a5472016-05-23 16:24:52 +01001660 break;
Jerry Yue7541932022-01-28 10:21:24 +08001661#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
Paul Bakker48916f92012-09-16 19:57:18 +00001662
Robert Cragie136884c2015-10-02 13:34:31 +01001663#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
Robert Cragieae8535d2015-10-06 17:11:18 +01001664 defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
Jerry Yub47d0f82021-12-20 17:34:40 +08001665 case MBEDTLS_TLS_EXT_SUPPORTED_GROUPS:
Simon Butcher584a5472016-05-23 16:24:52 +01001666 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported elliptic curves extension" ) );
Paul Bakker41c83d32013-03-20 14:39:14 +01001667
Jerry Yub47d0f82021-12-20 17:34:40 +08001668 ret = ssl_parse_supported_groups_ext( ssl, ext + 4, ext_size );
Simon Butcher584a5472016-05-23 16:24:52 +01001669 if( ret != 0 )
1670 return( ret );
1671 break;
Paul Bakker41c83d32013-03-20 14:39:14 +01001672
Simon Butcher584a5472016-05-23 16:24:52 +01001673 case MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS:
1674 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported point formats extension" ) );
1675 ssl->handshake->cli_exts |= MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT;
Paul Bakker41c83d32013-03-20 14:39:14 +01001676
Simon Butcher584a5472016-05-23 16:24:52 +01001677 ret = ssl_parse_supported_point_formats( ssl, ext + 4, ext_size );
1678 if( ret != 0 )
1679 return( ret );
1680 break;
Robert Cragieae8535d2015-10-06 17:11:18 +01001681#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
1682 MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
Paul Bakker41c83d32013-03-20 14:39:14 +01001683
Manuel Pégourié-Gonnardbf57be62015-09-16 15:04:01 +02001684#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
Simon Butcher584a5472016-05-23 16:24:52 +01001685 case MBEDTLS_TLS_EXT_ECJPAKE_KKPP:
1686 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ecjpake kkpp extension" ) );
Manuel Pégourié-Gonnardbf57be62015-09-16 15:04:01 +02001687
Simon Butcher584a5472016-05-23 16:24:52 +01001688 ret = ssl_parse_ecjpake_kkpp( ssl, ext + 4, ext_size );
1689 if( ret != 0 )
1690 return( ret );
1691 break;
Manuel Pégourié-Gonnardbf57be62015-09-16 15:04:01 +02001692#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
1693
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001694#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
Simon Butcher584a5472016-05-23 16:24:52 +01001695 case MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH:
1696 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found max fragment length extension" ) );
Manuel Pégourié-Gonnard48f8d0d2013-07-17 10:25:37 +02001697
Simon Butcher584a5472016-05-23 16:24:52 +01001698 ret = ssl_parse_max_fragment_length_ext( ssl, ext + 4, ext_size );
1699 if( ret != 0 )
1700 return( ret );
1701 break;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001702#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
Manuel Pégourié-Gonnard48f8d0d2013-07-17 10:25:37 +02001703
Hanno Beckera0e20d02019-05-15 14:03:01 +01001704#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
Hanno Becker89dcc882019-04-26 13:56:39 +01001705 case MBEDTLS_TLS_EXT_CID:
1706 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found CID extension" ) );
1707
1708 ret = ssl_parse_cid_ext( ssl, ext + 4, ext_size );
1709 if( ret != 0 )
1710 return( ret );
1711 break;
Thomas Daubneye1c9a402021-06-15 11:26:43 +01001712#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
Hanno Becker89dcc882019-04-26 13:56:39 +01001713
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001714#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
Simon Butcher584a5472016-05-23 16:24:52 +01001715 case MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC:
1716 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found encrypt then mac extension" ) );
Manuel Pégourié-Gonnard699cafa2014-10-27 13:57:03 +01001717
Simon Butcher584a5472016-05-23 16:24:52 +01001718 ret = ssl_parse_encrypt_then_mac_ext( ssl, ext + 4, ext_size );
1719 if( ret != 0 )
1720 return( ret );
1721 break;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001722#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
Manuel Pégourié-Gonnard699cafa2014-10-27 13:57:03 +01001723
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001724#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
Simon Butcher584a5472016-05-23 16:24:52 +01001725 case MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET:
1726 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found extended master secret extension" ) );
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +02001727
Simon Butcher584a5472016-05-23 16:24:52 +01001728 ret = ssl_parse_extended_ms_ext( ssl, ext + 4, ext_size );
1729 if( ret != 0 )
1730 return( ret );
1731 break;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001732#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +02001733
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001734#if defined(MBEDTLS_SSL_SESSION_TICKETS)
Simon Butcher584a5472016-05-23 16:24:52 +01001735 case MBEDTLS_TLS_EXT_SESSION_TICKET:
1736 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found session ticket extension" ) );
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02001737
Simon Butcher584a5472016-05-23 16:24:52 +01001738 ret = ssl_parse_session_ticket_ext( ssl, ext + 4, ext_size );
1739 if( ret != 0 )
1740 return( ret );
1741 break;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001742#endif /* MBEDTLS_SSL_SESSION_TICKETS */
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02001743
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001744#if defined(MBEDTLS_SSL_ALPN)
Simon Butcher584a5472016-05-23 16:24:52 +01001745 case MBEDTLS_TLS_EXT_ALPN:
1746 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) );
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +02001747
Simon Butcher584a5472016-05-23 16:24:52 +01001748 ret = ssl_parse_alpn_ext( ssl, ext + 4, ext_size );
1749 if( ret != 0 )
1750 return( ret );
1751 break;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001752#endif /* MBEDTLS_SSL_SESSION_TICKETS */
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +02001753
Johan Pascalb62bb512015-12-03 21:56:45 +01001754#if defined(MBEDTLS_SSL_DTLS_SRTP)
1755 case MBEDTLS_TLS_EXT_USE_SRTP:
1756 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found use_srtp extension" ) );
Johan Pascald576fdb2020-09-22 10:39:53 +02001757
Johan Pascalc3ccd982020-10-28 17:18:18 +01001758 ret = ssl_parse_use_srtp_ext( ssl, ext + 4, ext_size );
1759 if( ret != 0 )
1760 return( ret );
Johan Pascalb62bb512015-12-03 21:56:45 +01001761 break;
1762#endif /* MBEDTLS_SSL_DTLS_SRTP */
1763
Simon Butcher584a5472016-05-23 16:24:52 +01001764 default:
Paul Elliott9f352112020-12-09 14:55:45 +00001765 MBEDTLS_SSL_DEBUG_MSG( 3, ( "unknown extension found: %u (ignoring)",
Simon Butcher584a5472016-05-23 16:24:52 +01001766 ext_id ) );
1767 }
1768
1769 ext_len -= 4 + ext_size;
1770 ext += 4 + ext_size;
Paul Bakker48916f92012-09-16 19:57:18 +00001771 }
Janos Follathc6dab2b2016-05-23 14:27:02 +01001772
Jerry Yue7541932022-01-28 10:21:24 +08001773#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
Hanno Becker7e5437a2017-04-28 17:15:26 +01001774
1775 /*
1776 * Try to fall back to default hash SHA1 if the client
1777 * hasn't provided any preferred signature-hash combinations.
1778 */
1779 if( sig_hash_alg_ext_present == 0 )
1780 {
Jerry Yueb821c62022-01-19 18:35:56 +08001781 uint16_t sig_algs[] = { MBEDTLS_SSL_SIG_ALG(MBEDTLS_SSL_HASH_SHA1) };
1782 mbedtls_md_type_t md_default = MBEDTLS_MD_NONE;
Jerry Yu97198852022-01-21 16:16:01 +08001783 for( i = 0; i < sizeof( sig_algs ) / sizeof( sig_algs[0] ) ; i++ )
Jerry Yueb821c62022-01-19 18:35:56 +08001784 {
1785 if( mbedtls_ssl_sig_alg_is_offered( ssl, sig_algs[ i ] ) )
1786 md_default = MBEDTLS_MD_SHA1;
1787 }
Hanno Becker7e5437a2017-04-28 17:15:26 +01001788
Jerry Yu97198852022-01-21 16:16:01 +08001789 mbedtls_ssl_sig_hash_set_const_hash( &ssl->handshake->hash_algs,
1790 md_default );
Hanno Becker7e5437a2017-04-28 17:15:26 +01001791 }
1792
Jerry Yue7541932022-01-28 10:21:24 +08001793#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
Hanno Becker7e5437a2017-04-28 17:15:26 +01001794
Paul Bakker48916f92012-09-16 19:57:18 +00001795 /*
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001796 * Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV
1797 */
1798 for( i = 0, p = buf + ciph_offset + 2; i < ciph_len; i += 2, p += 2 )
1799 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001800 if( p[0] == 0 && p[1] == MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO )
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001801 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001802 MBEDTLS_SSL_DEBUG_MSG( 3, ( "received TLS_EMPTY_RENEGOTIATION_INFO " ) );
1803#if defined(MBEDTLS_SSL_RENEGOTIATION)
1804 if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001805 {
Hanno Becker0d0cd4b2017-05-11 14:06:43 +01001806 MBEDTLS_SSL_DEBUG_MSG( 1, ( "received RENEGOTIATION SCSV "
1807 "during renegotiation" ) );
Gilles Peskinec94f7352017-05-10 16:37:56 +02001808 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
1809 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
Dave Rodgmanc50b7172021-06-29 14:40:23 +01001810 return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001811 }
Manuel Pégourié-Gonnard69849f82015-03-10 11:54:02 +00001812#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001813 ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001814 break;
1815 }
1816 }
1817
1818 /*
Paul Bakker48916f92012-09-16 19:57:18 +00001819 * Renegotiation security checks
1820 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001821 if( ssl->secure_renegotiation != MBEDTLS_SSL_SECURE_RENEGOTIATION &&
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001822 ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE )
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00001823 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001824 MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) );
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00001825 handshake_failure = 1;
1826 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001827#if defined(MBEDTLS_SSL_RENEGOTIATION)
1828 else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
1829 ssl->secure_renegotiation == MBEDTLS_SSL_SECURE_RENEGOTIATION &&
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00001830 renegotiation_info_seen == 0 )
Paul Bakker48916f92012-09-16 19:57:18 +00001831 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001832 MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension missing (secure)" ) );
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00001833 handshake_failure = 1;
Paul Bakker48916f92012-09-16 19:57:18 +00001834 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001835 else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
1836 ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001837 ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION )
Paul Bakker48916f92012-09-16 19:57:18 +00001838 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001839 MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation not allowed" ) );
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00001840 handshake_failure = 1;
1841 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001842 else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
1843 ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00001844 renegotiation_info_seen == 1 )
1845 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001846 MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension present (legacy)" ) );
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00001847 handshake_failure = 1;
1848 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001849#endif /* MBEDTLS_SSL_RENEGOTIATION */
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00001850
1851 if( handshake_failure == 1 )
1852 {
Gilles Peskinec94f7352017-05-10 16:37:56 +02001853 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
1854 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
Hanno Becker90d59dd2021-06-24 11:17:13 +01001855 return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
Paul Bakker48916f92012-09-16 19:57:18 +00001856 }
Paul Bakker380da532012-04-18 16:10:25 +00001857
Paul Bakker41c83d32013-03-20 14:39:14 +01001858 /*
Glenn Strauss2ed95272022-01-21 18:02:17 -05001859 * Server certification selection (after processing TLS extensions)
1860 */
1861 if( ssl->conf->f_cert_cb && ( ret = ssl->conf->f_cert_cb( ssl ) ) != 0 )
1862 {
1863 MBEDTLS_SSL_DEBUG_RET( 1, "f_cert_cb", ret );
1864 return( ret );
1865 }
Glenn Strauss69894072022-01-24 12:58:00 -05001866#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
1867 ssl->handshake->sni_name = NULL;
1868 ssl->handshake->sni_name_len = 0;
1869#endif
Glenn Strauss2ed95272022-01-21 18:02:17 -05001870
1871 /*
Paul Bakker41c83d32013-03-20 14:39:14 +01001872 * Search for a matching ciphersuite
Manuel Pégourié-Gonnard3ebb2cd2013-09-23 17:00:18 +02001873 * (At the end because we need information from the EC-based extensions
Glenn Strauss2ed95272022-01-21 18:02:17 -05001874 * and certificate from the SNI callback triggered by the SNI extension
1875 * or certificate from server certificate selection callback.)
Paul Bakker41c83d32013-03-20 14:39:14 +01001876 */
Manuel Pégourié-Gonnardf01768c2015-01-08 17:06:16 +01001877 got_common_suite = 0;
Hanno Beckerd60b6c62021-04-29 12:04:11 +01001878 ciphersuites = ssl->conf->ciphersuite_list;
Manuel Pégourié-Gonnard59b81d72013-11-30 17:46:04 +01001879 ciphersuite_info = NULL;
TRodziewicz8476f2f2021-06-02 14:34:47 +02001880
TRodziewicz3946f792021-06-14 12:11:18 +02001881 if (ssl->conf->respect_cli_pref == MBEDTLS_SSL_SRV_CIPHERSUITE_ORDER_CLIENT)
TRodziewicz8476f2f2021-06-02 14:34:47 +02001882 {
Manuel Pégourié-Gonnard8933a652014-03-20 17:29:27 +01001883 for( j = 0, p = buf + ciph_offset + 2; j < ciph_len; j += 2, p += 2 )
TRodziewicz8476f2f2021-06-02 14:34:47 +02001884 for( i = 0; ciphersuites[i] != 0; i++ )
1885 {
Joe Subbianie4603ee2021-08-20 13:05:30 +01001886 if( MBEDTLS_GET_UINT16_BE(p, 0) != ciphersuites[i] )
TRodziewicz8476f2f2021-06-02 14:34:47 +02001887 continue;
Paul Bakker41c83d32013-03-20 14:39:14 +01001888
TRodziewicz8476f2f2021-06-02 14:34:47 +02001889 got_common_suite = 1;
Manuel Pégourié-Gonnardf01768c2015-01-08 17:06:16 +01001890
TRodziewicz8476f2f2021-06-02 14:34:47 +02001891 if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i],
1892 &ciphersuite_info ) ) != 0 )
1893 return( ret );
Manuel Pégourié-Gonnard011a8db2013-11-30 18:11:07 +01001894
TRodziewicz8476f2f2021-06-02 14:34:47 +02001895 if( ciphersuite_info != NULL )
1896 goto have_ciphersuite;
1897 }
1898 } else {
1899 for( i = 0; ciphersuites[i] != 0; i++ )
1900 for( j = 0, p = buf + ciph_offset + 2; j < ciph_len; j += 2, p += 2 )
1901 {
Joe Subbianie4603ee2021-08-20 13:05:30 +01001902 if( MBEDTLS_GET_UINT16_BE(p, 0) != ciphersuites[i] )
TRodziewicz8476f2f2021-06-02 14:34:47 +02001903 continue;
1904
1905 got_common_suite = 1;
1906
1907 if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i],
1908 &ciphersuite_info ) ) != 0 )
1909 return( ret );
1910
1911 if( ciphersuite_info != NULL )
1912 goto have_ciphersuite;
1913 }
1914 }
Paul Bakker41c83d32013-03-20 14:39:14 +01001915
Manuel Pégourié-Gonnardf01768c2015-01-08 17:06:16 +01001916 if( got_common_suite )
1917 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001918 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got ciphersuites in common, "
Manuel Pégourié-Gonnardf01768c2015-01-08 17:06:16 +01001919 "but none of them usable" ) );
Gilles Peskinec94f7352017-05-10 16:37:56 +02001920 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
1921 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
Dave Rodgman096c4112021-06-29 09:52:06 +01001922 return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
Manuel Pégourié-Gonnardf01768c2015-01-08 17:06:16 +01001923 }
1924 else
1925 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001926 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) );
Gilles Peskinec94f7352017-05-10 16:37:56 +02001927 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
1928 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
Dave Rodgmanbb05cd02021-06-29 10:37:43 +01001929 return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
Manuel Pégourié-Gonnardf01768c2015-01-08 17:06:16 +01001930 }
Paul Bakker41c83d32013-03-20 14:39:14 +01001931
1932have_ciphersuite:
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001933 MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s", ciphersuite_info->name ) );
Manuel Pégourié-Gonnard607d6632015-01-26 11:17:20 +00001934
Paul Bakker8f4ddae2013-04-15 15:09:54 +02001935 ssl->session_negotiate->ciphersuite = ciphersuites[i];
Hanno Beckere694c3e2017-12-27 21:34:08 +00001936 ssl->handshake->ciphersuite_info = ciphersuite_info;
Paul Bakker41c83d32013-03-20 14:39:14 +01001937
Paul Bakker5121ce52009-01-03 21:22:43 +00001938 ssl->state++;
1939
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001940#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001941 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001942 mbedtls_ssl_recv_flight_completed( ssl );
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02001943#endif
1944
Hanno Becker7e5437a2017-04-28 17:15:26 +01001945 /* Debugging-only output for testsuite */
1946#if defined(MBEDTLS_DEBUG_C) && \
Gilles Peskineeccd8882020-03-10 12:19:08 +01001947 defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
Hanno Becker7e5437a2017-04-28 17:15:26 +01001948 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
1949 {
1950 mbedtls_pk_type_t sig_alg = mbedtls_ssl_get_ciphersuite_sig_alg( ciphersuite_info );
1951 if( sig_alg != MBEDTLS_PK_NONE )
1952 {
1953 mbedtls_md_type_t md_alg = mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs,
1954 sig_alg );
1955 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext: %d",
1956 mbedtls_ssl_hash_from_md_alg( md_alg ) ) );
1957 }
1958 else
1959 {
Hanno Becker0d0cd4b2017-05-11 14:06:43 +01001960 MBEDTLS_SSL_DEBUG_MSG( 3, ( "no hash algorithm for signature algorithm "
Paul Elliott3891caf2020-12-17 18:42:40 +00001961 "%u - should not happen", (unsigned) sig_alg ) );
Hanno Becker7e5437a2017-04-28 17:15:26 +01001962 }
1963 }
1964#endif
1965
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001966 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00001967
1968 return( 0 );
1969}
1970
Hanno Beckera0e20d02019-05-15 14:03:01 +01001971#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
Hanno Becker51de2d32019-04-26 15:46:55 +01001972static void ssl_write_cid_ext( mbedtls_ssl_context *ssl,
1973 unsigned char *buf,
1974 size_t *olen )
1975{
1976 unsigned char *p = buf;
1977 size_t ext_len;
1978 const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
1979
1980 *olen = 0;
1981
1982 /* Skip writing the extension if we don't want to use it or if
1983 * the client hasn't offered it. */
1984 if( ssl->handshake->cid_in_use == MBEDTLS_SSL_CID_DISABLED )
1985 return;
1986
1987 /* ssl->own_cid_len is at most MBEDTLS_SSL_CID_IN_LEN_MAX
1988 * which is at most 255, so the increment cannot overflow. */
1989 if( end < p || (size_t)( end - p ) < (unsigned)( ssl->own_cid_len + 5 ) )
1990 {
1991 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
1992 return;
1993 }
1994
1995 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding CID extension" ) );
1996
1997 /*
Hanno Beckerebcc9132019-05-15 10:26:32 +01001998 * Quoting draft-ietf-tls-dtls-connection-id-05
1999 * https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05
Hanno Becker51de2d32019-04-26 15:46:55 +01002000 *
2001 * struct {
2002 * opaque cid<0..2^8-1>;
2003 * } ConnectionId;
2004 */
Joe Subbiani1f6c3ae2021-08-20 11:44:44 +01002005 MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_CID, p, 0 );
2006 p += 2;
Hanno Becker51de2d32019-04-26 15:46:55 +01002007 ext_len = (size_t) ssl->own_cid_len + 1;
Joe Subbiani1f6c3ae2021-08-20 11:44:44 +01002008 MBEDTLS_PUT_UINT16_BE( ext_len, p, 0 );
2009 p += 2;
Hanno Becker51de2d32019-04-26 15:46:55 +01002010
2011 *p++ = (uint8_t) ssl->own_cid_len;
2012 memcpy( p, ssl->own_cid, ssl->own_cid_len );
2013
2014 *olen = ssl->own_cid_len + 5;
2015}
Hanno Beckera0e20d02019-05-15 14:03:01 +01002016#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
Hanno Becker51de2d32019-04-26 15:46:55 +01002017
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002018#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
2019static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnard699cafa2014-10-27 13:57:03 +01002020 unsigned char *buf,
2021 size_t *olen )
2022{
2023 unsigned char *p = buf;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002024 const mbedtls_ssl_ciphersuite_t *suite = NULL;
Przemyslaw Stekiel2c87a202022-01-31 10:59:30 +01002025#if defined(MBEDTLS_USE_PSA_CRYPTO)
2026 psa_key_type_t key_type;
2027 psa_algorithm_t alg;
2028 size_t key_bits;
2029#else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002030 const mbedtls_cipher_info_t *cipher = NULL;
Przemyslaw Stekiel2c87a202022-01-31 10:59:30 +01002031#endif /* MBEDTLS_USE_PSA_CRYPTO */
Manuel Pégourié-Gonnard699cafa2014-10-27 13:57:03 +01002032
Manuel Pégourié-Gonnard78e745f2014-11-04 15:44:06 +01002033 /*
2034 * RFC 7366: "If a server receives an encrypt-then-MAC request extension
2035 * from a client and then selects a stream or Authenticated Encryption
2036 * with Associated Data (AEAD) ciphersuite, it MUST NOT send an
2037 * encrypt-then-MAC response extension back to the client."
2038 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002039 if( ( suite = mbedtls_ssl_ciphersuite_from_id(
Manuel Pégourié-Gonnard78e745f2014-11-04 15:44:06 +01002040 ssl->session_negotiate->ciphersuite ) ) == NULL ||
Przemyslaw Stekiel2c87a202022-01-31 10:59:30 +01002041#if defined(MBEDTLS_USE_PSA_CRYPTO)
Przemyslaw Stekiel8c010eb2022-02-03 10:44:02 +01002042 ( mbedtls_ssl_cipher_to_psa( suite->cipher, 0, &alg,
2043 &key_type, &key_bits ) != PSA_SUCCESS ) ||
Przemyslaw Stekiel2c87a202022-01-31 10:59:30 +01002044 alg != PSA_ALG_CBC_NO_PADDING )
2045#else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002046 ( cipher = mbedtls_cipher_info_from_type( suite->cipher ) ) == NULL ||
2047 cipher->mode != MBEDTLS_MODE_CBC )
Przemyslaw Stekiel2c87a202022-01-31 10:59:30 +01002048#endif /* MBEDTLS_USE_PSA_CRYPTO */
Manuel Pégourié-Gonnard78e745f2014-11-04 15:44:06 +01002049 {
Ronald Cron862902d2022-03-24 14:15:28 +01002050 ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_DISABLED;
2051 }
2052
2053 if( ssl->session_negotiate->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED )
2054 {
Manuel Pégourié-Gonnard78e745f2014-11-04 15:44:06 +01002055 *olen = 0;
2056 return;
2057 }
2058
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002059 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding encrypt then mac extension" ) );
Manuel Pégourié-Gonnard699cafa2014-10-27 13:57:03 +01002060
Joe Subbiani1f6c3ae2021-08-20 11:44:44 +01002061 MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC, p, 0 );
2062 p += 2;
Manuel Pégourié-Gonnard699cafa2014-10-27 13:57:03 +01002063
2064 *p++ = 0x00;
2065 *p++ = 0x00;
2066
2067 *olen = 4;
2068}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002069#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
Manuel Pégourié-Gonnard699cafa2014-10-27 13:57:03 +01002070
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002071#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
2072static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +02002073 unsigned char *buf,
2074 size_t *olen )
2075{
2076 unsigned char *p = buf;
2077
Mateusz Starzyk06b07fb2021-02-18 13:55:21 +01002078 if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED )
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +02002079 {
2080 *olen = 0;
2081 return;
2082 }
2083
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002084 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding extended master secret "
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +02002085 "extension" ) );
2086
Joe Subbiani1f6c3ae2021-08-20 11:44:44 +01002087 MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET, p, 0 );
2088 p += 2;
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +02002089
2090 *p++ = 0x00;
2091 *p++ = 0x00;
2092
2093 *olen = 4;
2094}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002095#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +02002096
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002097#if defined(MBEDTLS_SSL_SESSION_TICKETS)
2098static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02002099 unsigned char *buf,
2100 size_t *olen )
2101{
2102 unsigned char *p = buf;
2103
2104 if( ssl->handshake->new_session_ticket == 0 )
2105 {
2106 *olen = 0;
2107 return;
2108 }
2109
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002110 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding session ticket extension" ) );
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02002111
Joe Subbiani1f6c3ae2021-08-20 11:44:44 +01002112 MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_SESSION_TICKET, p, 0 );
2113 p += 2;
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02002114
2115 *p++ = 0x00;
2116 *p++ = 0x00;
2117
2118 *olen = 4;
2119}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002120#endif /* MBEDTLS_SSL_SESSION_TICKETS */
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02002121
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002122static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnardf11a6d72013-07-17 11:17:14 +02002123 unsigned char *buf,
2124 size_t *olen )
2125{
2126 unsigned char *p = buf;
2127
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002128 if( ssl->secure_renegotiation != MBEDTLS_SSL_SECURE_RENEGOTIATION )
Manuel Pégourié-Gonnardf11a6d72013-07-17 11:17:14 +02002129 {
2130 *olen = 0;
2131 return;
2132 }
2133
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002134 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, secure renegotiation extension" ) );
Manuel Pégourié-Gonnardf11a6d72013-07-17 11:17:14 +02002135
Joe Subbiani1f6c3ae2021-08-20 11:44:44 +01002136 MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO, p, 0 );
2137 p += 2;
Manuel Pégourié-Gonnardf11a6d72013-07-17 11:17:14 +02002138
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002139#if defined(MBEDTLS_SSL_RENEGOTIATION)
2140 if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01002141 {
2142 *p++ = 0x00;
2143 *p++ = ( ssl->verify_data_len * 2 + 1 ) & 0xFF;
2144 *p++ = ssl->verify_data_len * 2 & 0xFF;
Manuel Pégourié-Gonnardf11a6d72013-07-17 11:17:14 +02002145
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01002146 memcpy( p, ssl->peer_verify_data, ssl->verify_data_len );
2147 p += ssl->verify_data_len;
2148 memcpy( p, ssl->own_verify_data, ssl->verify_data_len );
2149 p += ssl->verify_data_len;
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01002150 }
2151 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002152#endif /* MBEDTLS_SSL_RENEGOTIATION */
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01002153 {
2154 *p++ = 0x00;
2155 *p++ = 0x01;
2156 *p++ = 0x00;
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01002157 }
Manuel Pégourié-Gonnard19389752015-06-23 13:46:44 +02002158
2159 *olen = p - buf;
Manuel Pégourié-Gonnardf11a6d72013-07-17 11:17:14 +02002160}
2161
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002162#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
2163static void ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnard7bb78992013-07-17 13:50:08 +02002164 unsigned char *buf,
2165 size_t *olen )
2166{
2167 unsigned char *p = buf;
2168
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002169 if( ssl->session_negotiate->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE )
Manuel Pégourié-Gonnarde048b672013-07-19 12:47:00 +02002170 {
Manuel Pégourié-Gonnard7bb78992013-07-17 13:50:08 +02002171 *olen = 0;
2172 return;
2173 }
2174
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002175 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, max_fragment_length extension" ) );
Manuel Pégourié-Gonnard7bb78992013-07-17 13:50:08 +02002176
Joe Subbiani1f6c3ae2021-08-20 11:44:44 +01002177 MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH, p, 0 );
2178 p += 2;
Manuel Pégourié-Gonnard7bb78992013-07-17 13:50:08 +02002179
2180 *p++ = 0x00;
2181 *p++ = 1;
2182
Manuel Pégourié-Gonnarded4af8b2013-07-18 14:07:09 +02002183 *p++ = ssl->session_negotiate->mfl_code;
Manuel Pégourié-Gonnard7bb78992013-07-17 13:50:08 +02002184
2185 *olen = 5;
2186}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002187#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
Manuel Pégourié-Gonnard7bb78992013-07-17 13:50:08 +02002188
Manuel Pégourié-Gonnardf4721792015-09-15 10:53:51 +02002189#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
Manuel Pégourié-Gonnardeef142d2015-09-16 10:05:04 +02002190 defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002191static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnard7b19c162013-08-15 18:01:11 +02002192 unsigned char *buf,
2193 size_t *olen )
2194{
2195 unsigned char *p = buf;
2196 ((void) ssl);
2197
Paul Bakker677377f2013-10-28 12:54:26 +01002198 if( ( ssl->handshake->cli_exts &
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002199 MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT ) == 0 )
Paul Bakker677377f2013-10-28 12:54:26 +01002200 {
2201 *olen = 0;
2202 return;
2203 }
Manuel Pégourié-Gonnard7b19c162013-08-15 18:01:11 +02002204
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002205 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, supported_point_formats extension" ) );
Manuel Pégourié-Gonnard7b19c162013-08-15 18:01:11 +02002206
Joe Subbiani1f6c3ae2021-08-20 11:44:44 +01002207 MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS, p, 0 );
2208 p += 2;
Manuel Pégourié-Gonnard7b19c162013-08-15 18:01:11 +02002209
2210 *p++ = 0x00;
2211 *p++ = 2;
2212
2213 *p++ = 1;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002214 *p++ = MBEDTLS_ECP_PF_UNCOMPRESSED;
Manuel Pégourié-Gonnard7b19c162013-08-15 18:01:11 +02002215
2216 *olen = 6;
2217}
Manuel Pégourié-Gonnardeef142d2015-09-16 10:05:04 +02002218#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
Manuel Pégourié-Gonnard7b19c162013-08-15 18:01:11 +02002219
Manuel Pégourié-Gonnard55c7f992015-09-16 15:35:27 +02002220#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
2221static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl,
2222 unsigned char *buf,
2223 size_t *olen )
2224{
Janos Follath865b3eb2019-12-16 11:46:15 +00002225 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
Manuel Pégourié-Gonnard55c7f992015-09-16 15:35:27 +02002226 unsigned char *p = buf;
Angus Grattond8213d02016-05-25 20:56:48 +10002227 const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
Manuel Pégourié-Gonnard55c7f992015-09-16 15:35:27 +02002228 size_t kkpp_len;
2229
2230 *olen = 0;
2231
2232 /* Skip costly computation if not needed */
Hanno Beckere694c3e2017-12-27 21:34:08 +00002233 if( ssl->handshake->ciphersuite_info->key_exchange !=
Manuel Pégourié-Gonnard55c7f992015-09-16 15:35:27 +02002234 MBEDTLS_KEY_EXCHANGE_ECJPAKE )
2235 return;
2236
2237 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, ecjpake kkpp extension" ) );
2238
2239 if( end - p < 4 )
2240 {
2241 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
2242 return;
2243 }
2244
Joe Subbiani1f6c3ae2021-08-20 11:44:44 +01002245 MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_ECJPAKE_KKPP, p, 0 );
2246 p += 2;
Manuel Pégourié-Gonnard55c7f992015-09-16 15:35:27 +02002247
Manuel Pégourié-Gonnard5674a972015-10-19 15:14:03 +02002248 ret = mbedtls_ecjpake_write_round_one( &ssl->handshake->ecjpake_ctx,
2249 p + 2, end - p - 2, &kkpp_len,
2250 ssl->conf->f_rng, ssl->conf->p_rng );
2251 if( ret != 0 )
Manuel Pégourié-Gonnard55c7f992015-09-16 15:35:27 +02002252 {
2253 MBEDTLS_SSL_DEBUG_RET( 1 , "mbedtls_ecjpake_write_round_one", ret );
2254 return;
2255 }
2256
Joe Subbiani1f6c3ae2021-08-20 11:44:44 +01002257 MBEDTLS_PUT_UINT16_BE( kkpp_len, p, 0 );
2258 p += 2;
Manuel Pégourié-Gonnard55c7f992015-09-16 15:35:27 +02002259
2260 *olen = kkpp_len + 4;
2261}
2262#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
2263
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002264#if defined(MBEDTLS_SSL_ALPN )
2265static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +02002266 unsigned char *buf, size_t *olen )
2267{
2268 if( ssl->alpn_chosen == NULL )
2269 {
2270 *olen = 0;
2271 return;
2272 }
2273
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002274 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding alpn extension" ) );
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +02002275
2276 /*
2277 * 0 . 1 ext identifier
2278 * 2 . 3 ext length
2279 * 4 . 5 protocol list length
2280 * 6 . 6 protocol name length
2281 * 7 . 7+n protocol name
2282 */
Joe Subbiani6dd73642021-07-19 11:56:54 +01002283 MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_ALPN, buf, 0);
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +02002284
2285 *olen = 7 + strlen( ssl->alpn_chosen );
2286
Joe Subbiani6dd73642021-07-19 11:56:54 +01002287 MBEDTLS_PUT_UINT16_BE( *olen - 4, buf, 2 );
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +02002288
Joe Subbiani6dd73642021-07-19 11:56:54 +01002289 MBEDTLS_PUT_UINT16_BE( *olen - 6, buf, 4 );
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +02002290
Joe Subbiani2194dc42021-07-14 12:31:31 +01002291 buf[6] = MBEDTLS_BYTE_0( *olen - 7 );
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +02002292
2293 memcpy( buf + 7, ssl->alpn_chosen, *olen - 7 );
2294}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002295#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C */
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +02002296
Ron Eldor3adb9922017-12-21 10:15:08 +02002297#if defined(MBEDTLS_SSL_DTLS_SRTP ) && defined(MBEDTLS_SSL_PROTO_DTLS)
Johan Pascalb62bb512015-12-03 21:56:45 +01002298static void ssl_write_use_srtp_ext( mbedtls_ssl_context *ssl,
Ron Eldoref72faf2018-07-12 11:54:20 +03002299 unsigned char *buf,
2300 size_t *olen )
Johan Pascalb62bb512015-12-03 21:56:45 +01002301{
Ron Eldor75870ec2018-12-06 17:31:55 +02002302 size_t mki_len = 0, ext_len = 0;
Ron Eldor089c9fe2018-12-06 17:12:49 +02002303 uint16_t profile_value = 0;
Johan Pascal8f70fba2020-09-02 10:32:06 +02002304 const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
2305
2306 *olen = 0;
Ron Eldor591f1622018-01-22 12:30:04 +02002307
Johan Pascalc3ccd982020-10-28 17:18:18 +01002308 if( ( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ) ||
2309 ( ssl->dtls_srtp_info.chosen_dtls_srtp_profile == MBEDTLS_TLS_SRTP_UNSET ) )
Johan Pascalb62bb512015-12-03 21:56:45 +01002310 {
Johan Pascalb62bb512015-12-03 21:56:45 +01002311 return;
2312 }
2313
2314 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding use_srtp extension" ) );
2315
Johan Pascald576fdb2020-09-22 10:39:53 +02002316 if( ssl->conf->dtls_srtp_mki_support == MBEDTLS_SSL_DTLS_SRTP_MKI_SUPPORTED )
Ron Eldor591f1622018-01-22 12:30:04 +02002317 {
2318 mki_len = ssl->dtls_srtp_info.mki_len;
2319 }
2320
Johan Pascal9bc97ca2020-09-21 23:44:45 +02002321 /* The extension total size is 9 bytes :
2322 * - 2 bytes for the extension tag
2323 * - 2 bytes for the total size
2324 * - 2 bytes for the protection profile length
2325 * - 2 bytes for the protection profile
2326 * - 1 byte for the mki length
2327 * + the actual mki length
2328 * Check we have enough room in the output buffer */
Johan Pascald576fdb2020-09-22 10:39:53 +02002329 if( (size_t)( end - buf ) < mki_len + 9 )
Johan Pascal8f70fba2020-09-02 10:32:06 +02002330 {
2331 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
2332 return;
2333 }
2334
Johan Pascalb62bb512015-12-03 21:56:45 +01002335 /* extension */
Joe Subbiani6dd73642021-07-19 11:56:54 +01002336 MBEDTLS_PUT_UINT16_BE(MBEDTLS_TLS_EXT_USE_SRTP, buf, 0 );
Ron Eldoref72faf2018-07-12 11:54:20 +03002337 /*
2338 * total length 5 and mki value: only one profile(2 bytes)
2339 * and length(2 bytes) and srtp_mki )
2340 */
Ron Eldor591f1622018-01-22 12:30:04 +02002341 ext_len = 5 + mki_len;
Joe Subbiani6dd73642021-07-19 11:56:54 +01002342 MBEDTLS_PUT_UINT16_BE( ext_len, buf, 2 );
Johan Pascalb62bb512015-12-03 21:56:45 +01002343
2344 /* protection profile length: 2 */
2345 buf[4] = 0x00;
2346 buf[5] = 0x02;
Johan Pascal43f94902020-09-22 12:25:52 +02002347 profile_value = mbedtls_ssl_check_srtp_profile_value(
Johan Pascald576fdb2020-09-22 10:39:53 +02002348 ssl->dtls_srtp_info.chosen_dtls_srtp_profile );
Johan Pascal43f94902020-09-22 12:25:52 +02002349 if( profile_value != MBEDTLS_TLS_SRTP_UNSET )
Ron Eldor089c9fe2018-12-06 17:12:49 +02002350 {
Joe Subbiani6dd73642021-07-19 11:56:54 +01002351 MBEDTLS_PUT_UINT16_BE( profile_value, buf, 6 );
Ron Eldor089c9fe2018-12-06 17:12:49 +02002352 }
2353 else
2354 {
Johan Pascal8f70fba2020-09-02 10:32:06 +02002355 MBEDTLS_SSL_DEBUG_MSG( 1, ( "use_srtp extension invalid profile" ) );
Ron Eldor089c9fe2018-12-06 17:12:49 +02002356 return;
Johan Pascalb62bb512015-12-03 21:56:45 +01002357 }
2358
Ron Eldor591f1622018-01-22 12:30:04 +02002359 buf[8] = mki_len & 0xFF;
Ron Eldor75870ec2018-12-06 17:31:55 +02002360 memcpy( &buf[9], ssl->dtls_srtp_info.mki_value, mki_len );
Johan Pascalb62bb512015-12-03 21:56:45 +01002361
Ron Eldor591f1622018-01-22 12:30:04 +02002362 *olen = 9 + mki_len;
Johan Pascalb62bb512015-12-03 21:56:45 +01002363}
2364#endif /* MBEDTLS_SSL_DTLS_SRTP */
2365
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002366#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
2367static int ssl_write_hello_verify_request( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02002368{
Janos Follath865b3eb2019-12-16 11:46:15 +00002369 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02002370 unsigned char *p = ssl->out_msg + 4;
Manuel Pégourié-Gonnardd7f9bc52014-07-23 11:09:27 +02002371 unsigned char *cookie_len_byte;
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02002372
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002373 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello verify request" ) );
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02002374
2375 /*
2376 * struct {
2377 * ProtocolVersion server_version;
2378 * opaque cookie<0..2^8-1>;
2379 * } HelloVerifyRequest;
2380 */
2381
Manuel Pégourié-Gonnardb35fe562014-08-09 17:00:46 +02002382 /* The RFC is not clear on this point, but sending the actual negotiated
2383 * version looks like the most interoperable thing to do. */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002384 mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002385 ssl->conf->transport, p );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002386 MBEDTLS_SSL_DEBUG_BUF( 3, "server version", p, 2 );
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02002387 p += 2;
2388
Manuel Pégourié-Gonnard7d38d212014-07-23 17:52:09 +02002389 /* If we get here, f_cookie_check is not null */
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002390 if( ssl->conf->f_cookie_write == NULL )
Manuel Pégourié-Gonnard7d38d212014-07-23 17:52:09 +02002391 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002392 MBEDTLS_SSL_DEBUG_MSG( 1, ( "inconsistent cookie callbacks" ) );
2393 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard7d38d212014-07-23 17:52:09 +02002394 }
2395
Manuel Pégourié-Gonnardd7f9bc52014-07-23 11:09:27 +02002396 /* Skip length byte until we know the length */
2397 cookie_len_byte = p++;
2398
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002399 if( ( ret = ssl->conf->f_cookie_write( ssl->conf->p_cookie,
Angus Grattond8213d02016-05-25 20:56:48 +10002400 &p, ssl->out_buf + MBEDTLS_SSL_OUT_BUFFER_LEN,
Manuel Pégourié-Gonnardd485d192014-07-23 14:56:15 +02002401 ssl->cli_id, ssl->cli_id_len ) ) != 0 )
Manuel Pégourié-Gonnardd7f9bc52014-07-23 11:09:27 +02002402 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002403 MBEDTLS_SSL_DEBUG_RET( 1, "f_cookie_write", ret );
Manuel Pégourié-Gonnardd7f9bc52014-07-23 11:09:27 +02002404 return( ret );
2405 }
2406
2407 *cookie_len_byte = (unsigned char)( p - ( cookie_len_byte + 1 ) );
2408
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002409 MBEDTLS_SSL_DEBUG_BUF( 3, "cookie sent", cookie_len_byte + 1, *cookie_len_byte );
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02002410
2411 ssl->out_msglen = p - ssl->out_msg;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002412 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
2413 ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST;
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02002414
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002415 ssl->state = MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT;
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02002416
Manuel Pégourié-Gonnard31c15862017-09-13 09:38:11 +02002417 if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02002418 {
Manuel Pégourié-Gonnard31c15862017-09-13 09:38:11 +02002419 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02002420 return( ret );
2421 }
2422
Manuel Pégourié-Gonnard87a346f2017-09-13 12:45:21 +02002423#if defined(MBEDTLS_SSL_PROTO_DTLS)
2424 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
2425 ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 )
2426 {
2427 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flight_transmit", ret );
2428 return( ret );
2429 }
Hanno Beckerbc2498a2018-08-28 10:13:29 +01002430#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnard87a346f2017-09-13 12:45:21 +02002431
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002432 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello verify request" ) );
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02002433
2434 return( 0 );
2435}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002436#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02002437
Hanno Beckerf6e09c62021-05-13 06:12:38 +01002438static void ssl_handle_id_based_session_resumption( mbedtls_ssl_context *ssl )
Hanno Becker64ce9742021-04-15 08:19:40 +01002439{
2440 int ret;
Hanno Beckera5b1a392021-04-15 16:48:01 +01002441 mbedtls_ssl_session session_tmp;
Hanno Becker64ce9742021-04-15 08:19:40 +01002442 mbedtls_ssl_session * const session = ssl->session_negotiate;
2443
2444 /* Resume is 0 by default, see ssl_handshake_init().
2445 * It may be already set to 1 by ssl_parse_session_ticket_ext(). */
2446 if( ssl->handshake->resume == 1 )
2447 return;
Hanno Becker7ad77962021-05-13 06:13:34 +01002448 if( session->id_len == 0 )
Hanno Becker64ce9742021-04-15 08:19:40 +01002449 return;
2450 if( ssl->conf->f_get_cache == NULL )
2451 return;
2452#if defined(MBEDTLS_SSL_RENEGOTIATION)
2453 if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
2454 return;
2455#endif
2456
Hanno Beckera5b1a392021-04-15 16:48:01 +01002457 mbedtls_ssl_session_init( &session_tmp );
2458
Hanno Becker64ce9742021-04-15 08:19:40 +01002459 ret = ssl->conf->f_get_cache( ssl->conf->p_cache,
Hanno Beckerccdaf6e2021-04-15 09:26:17 +01002460 session->id,
2461 session->id_len,
Hanno Becker64ce9742021-04-15 08:19:40 +01002462 &session_tmp );
2463 if( ret != 0 )
2464 goto exit;
2465
2466 if( session->ciphersuite != session_tmp.ciphersuite ||
2467 session->compression != session_tmp.compression )
2468 {
2469 /* Mismatch between cached and negotiated session */
2470 goto exit;
2471 }
2472
2473 /* Move semantics */
Hanno Becker64ce9742021-04-15 08:19:40 +01002474 mbedtls_ssl_session_free( session );
2475 *session = session_tmp;
Hanno Beckerfc1f4132021-05-14 14:57:54 +01002476 memset( &session_tmp, 0, sizeof( session_tmp ) );
Hanno Becker64ce9742021-04-15 08:19:40 +01002477
2478 MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from cache" ) );
2479 ssl->handshake->resume = 1;
2480
2481exit:
2482
Hanno Beckerdf564022021-05-13 06:26:37 +01002483 mbedtls_ssl_session_free( &session_tmp );
Hanno Becker64ce9742021-04-15 08:19:40 +01002484}
2485
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002486static int ssl_write_server_hello( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00002487{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002488#if defined(MBEDTLS_HAVE_TIME)
SimonBd5800b72016-04-26 07:43:27 +01002489 mbedtls_time_t t;
Paul Bakkerfa9b1002013-07-03 15:31:03 +02002490#endif
Janos Follath865b3eb2019-12-16 11:46:15 +00002491 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
Paul Bakkerb9cfaa02013-10-11 18:58:55 +02002492 size_t olen, ext_len = 0, n;
Paul Bakker5121ce52009-01-03 21:22:43 +00002493 unsigned char *buf, *p;
2494
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002495 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server hello" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002496
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002497#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002498 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
Manuel Pégourié-Gonnardd7f9bc52014-07-23 11:09:27 +02002499 ssl->handshake->verify_cookie_len != 0 )
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02002500 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002501 MBEDTLS_SSL_DEBUG_MSG( 2, ( "client hello was not authenticated" ) );
2502 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello" ) );
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02002503
Manuel Pégourié-Gonnard579950c2014-09-29 17:47:33 +02002504 return( ssl_write_hello_verify_request( ssl ) );
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02002505 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002506#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
Manuel Pégourié-Gonnard2c9ee812014-07-22 11:45:03 +02002507
Manuel Pégourié-Gonnard750e4d72015-05-07 12:35:38 +01002508 if( ssl->conf->f_rng == NULL )
Paul Bakkera9a028e2013-11-21 17:31:06 +01002509 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002510 MBEDTLS_SSL_DEBUG_MSG( 1, ( "no RNG provided") );
2511 return( MBEDTLS_ERR_SSL_NO_RNG );
Paul Bakkera9a028e2013-11-21 17:31:06 +01002512 }
2513
Paul Bakker5121ce52009-01-03 21:22:43 +00002514 /*
2515 * 0 . 0 handshake type
2516 * 1 . 3 handshake length
2517 * 4 . 5 protocol version
2518 * 6 . 9 UNIX time()
2519 * 10 . 37 random bytes
2520 */
2521 buf = ssl->out_msg;
2522 p = buf + 4;
2523
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002524 mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002525 ssl->conf->transport, p );
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01002526 p += 2;
Paul Bakker5121ce52009-01-03 21:22:43 +00002527
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002528 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen version: [%d:%d]",
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01002529 buf[4], buf[5] ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002530
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002531#if defined(MBEDTLS_HAVE_TIME)
SimonBd5800b72016-04-26 07:43:27 +01002532 t = mbedtls_time( NULL );
Joe Subbiani1f6c3ae2021-08-20 11:44:44 +01002533 MBEDTLS_PUT_UINT32_BE( t, p, 0 );
2534 p += 4;
Paul Bakker5121ce52009-01-03 21:22:43 +00002535
Paul Elliottd48d5c62021-01-07 14:47:05 +00002536 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, current time: %" MBEDTLS_PRINTF_LONGLONG,
2537 (long long) t ) );
Paul Bakkerfa9b1002013-07-03 15:31:03 +02002538#else
Manuel Pégourié-Gonnard750e4d72015-05-07 12:35:38 +01002539 if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 4 ) ) != 0 )
Paul Bakkerfa9b1002013-07-03 15:31:03 +02002540 return( ret );
2541
2542 p += 4;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002543#endif /* MBEDTLS_HAVE_TIME */
Paul Bakker5121ce52009-01-03 21:22:43 +00002544
Manuel Pégourié-Gonnard750e4d72015-05-07 12:35:38 +01002545 if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 28 ) ) != 0 )
Paul Bakkera3d195c2011-11-27 21:07:34 +00002546 return( ret );
2547
2548 p += 28;
Paul Bakker5121ce52009-01-03 21:22:43 +00002549
Paul Bakker48916f92012-09-16 19:57:18 +00002550 memcpy( ssl->handshake->randbytes + 32, buf + 6, 32 );
Paul Bakker5121ce52009-01-03 21:22:43 +00002551
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002552 MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 6, 32 );
Paul Bakker5121ce52009-01-03 21:22:43 +00002553
Hanno Beckerf6e09c62021-05-13 06:12:38 +01002554 ssl_handle_id_based_session_resumption( ssl );
Paul Bakker5121ce52009-01-03 21:22:43 +00002555
Manuel Pégourié-Gonnard3ffa3db2013-08-02 11:59:05 +02002556 if( ssl->handshake->resume == 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00002557 {
2558 /*
Manuel Pégourié-Gonnard3ffa3db2013-08-02 11:59:05 +02002559 * New session, create a new session id,
2560 * unless we're about to issue a session ticket
Paul Bakker5121ce52009-01-03 21:22:43 +00002561 */
Paul Bakker5121ce52009-01-03 21:22:43 +00002562 ssl->state++;
2563
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002564#if defined(MBEDTLS_HAVE_TIME)
SimonBd5800b72016-04-26 07:43:27 +01002565 ssl->session_negotiate->start = mbedtls_time( NULL );
Manuel Pégourié-Gonnard164d8942013-09-23 22:01:39 +02002566#endif
2567
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002568#if defined(MBEDTLS_SSL_SESSION_TICKETS)
Manuel Pégourié-Gonnard164d8942013-09-23 22:01:39 +02002569 if( ssl->handshake->new_session_ticket != 0 )
2570 {
Manuel Pégourié-Gonnard12ad7982015-06-18 15:50:37 +02002571 ssl->session_negotiate->id_len = n = 0;
Manuel Pégourié-Gonnard164d8942013-09-23 22:01:39 +02002572 memset( ssl->session_negotiate->id, 0, 32 );
2573 }
2574 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002575#endif /* MBEDTLS_SSL_SESSION_TICKETS */
Manuel Pégourié-Gonnard3ffa3db2013-08-02 11:59:05 +02002576 {
Manuel Pégourié-Gonnard12ad7982015-06-18 15:50:37 +02002577 ssl->session_negotiate->id_len = n = 32;
Manuel Pégourié-Gonnard750e4d72015-05-07 12:35:38 +01002578 if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->session_negotiate->id,
Paul Bakkera503a632013-08-14 13:48:06 +02002579 n ) ) != 0 )
Manuel Pégourié-Gonnard3ffa3db2013-08-02 11:59:05 +02002580 return( ret );
2581 }
Paul Bakker5121ce52009-01-03 21:22:43 +00002582 }
2583 else
2584 {
2585 /*
Manuel Pégourié-Gonnard3ffa3db2013-08-02 11:59:05 +02002586 * Resuming a session
Paul Bakker5121ce52009-01-03 21:22:43 +00002587 */
Manuel Pégourié-Gonnard12ad7982015-06-18 15:50:37 +02002588 n = ssl->session_negotiate->id_len;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002589 ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC;
Paul Bakkerff60ee62010-03-16 21:09:09 +00002590
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002591 if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
Paul Bakkerff60ee62010-03-16 21:09:09 +00002592 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002593 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
Paul Bakkerff60ee62010-03-16 21:09:09 +00002594 return( ret );
2595 }
Paul Bakker5121ce52009-01-03 21:22:43 +00002596 }
2597
Manuel Pégourié-Gonnard3ffa3db2013-08-02 11:59:05 +02002598 /*
2599 * 38 . 38 session id length
2600 * 39 . 38+n session id
2601 * 39+n . 40+n chosen ciphersuite
2602 * 41+n . 41+n chosen compression alg.
2603 * 42+n . 43+n extensions length
2604 * 44+n . 43+n+m extensions
2605 */
Manuel Pégourié-Gonnard12ad7982015-06-18 15:50:37 +02002606 *p++ = (unsigned char) ssl->session_negotiate->id_len;
2607 memcpy( p, ssl->session_negotiate->id, ssl->session_negotiate->id_len );
2608 p += ssl->session_negotiate->id_len;
Paul Bakker5121ce52009-01-03 21:22:43 +00002609
Paul Elliottd48d5c62021-01-07 14:47:05 +00002610 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %" MBEDTLS_PRINTF_SIZET, n ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002611 MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, session id", buf + 39, n );
2612 MBEDTLS_SSL_DEBUG_MSG( 3, ( "%s session has been resumed",
Paul Bakker0a597072012-09-25 21:55:46 +00002613 ssl->handshake->resume ? "a" : "no" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002614
Joe Subbiani1f6c3ae2021-08-20 11:44:44 +01002615 MBEDTLS_PUT_UINT16_BE( ssl->session_negotiate->ciphersuite, p, 0 );
2616 p += 2;
Joe Subbianifbeb6922021-07-16 14:27:50 +01002617 *p++ = MBEDTLS_BYTE_0( ssl->session_negotiate->compression );
Paul Bakker5121ce52009-01-03 21:22:43 +00002618
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002619 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %s",
2620 mbedtls_ssl_get_ciphersuite_name( ssl->session_negotiate->ciphersuite ) ) );
2621 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: 0x%02X",
Paul Elliott3891caf2020-12-17 18:42:40 +00002622 (unsigned int) ssl->session_negotiate->compression ) );
Paul Bakker48916f92012-09-16 19:57:18 +00002623
Manuel Pégourié-Gonnardf11a6d72013-07-17 11:17:14 +02002624 /*
2625 * First write extensions, then the total length
2626 */
2627 ssl_write_renegotiation_ext( ssl, p + 2 + ext_len, &olen );
2628 ext_len += olen;
Paul Bakker48916f92012-09-16 19:57:18 +00002629
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002630#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
Manuel Pégourié-Gonnard7bb78992013-07-17 13:50:08 +02002631 ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len, &olen );
2632 ext_len += olen;
Paul Bakker05decb22013-08-15 13:33:48 +02002633#endif
Manuel Pégourié-Gonnard7bb78992013-07-17 13:50:08 +02002634
Hanno Beckera0e20d02019-05-15 14:03:01 +01002635#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
Hanno Becker51de2d32019-04-26 15:46:55 +01002636 ssl_write_cid_ext( ssl, p + 2 + ext_len, &olen );
2637 ext_len += olen;
2638#endif
2639
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002640#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
Manuel Pégourié-Gonnard699cafa2014-10-27 13:57:03 +01002641 ssl_write_encrypt_then_mac_ext( ssl, p + 2 + ext_len, &olen );
2642 ext_len += olen;
2643#endif
2644
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002645#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +02002646 ssl_write_extended_ms_ext( ssl, p + 2 + ext_len, &olen );
2647 ext_len += olen;
2648#endif
2649
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002650#if defined(MBEDTLS_SSL_SESSION_TICKETS)
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02002651 ssl_write_session_ticket_ext( ssl, p + 2 + ext_len, &olen );
2652 ext_len += olen;
Paul Bakkera503a632013-08-14 13:48:06 +02002653#endif
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02002654
Manuel Pégourié-Gonnardf4721792015-09-15 10:53:51 +02002655#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
Robert Cragieae8535d2015-10-06 17:11:18 +01002656 defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
Ron Eldor755bb6a2018-02-14 19:30:48 +02002657 if ( mbedtls_ssl_ciphersuite_uses_ec(
2658 mbedtls_ssl_ciphersuite_from_id( ssl->session_negotiate->ciphersuite ) ) )
2659 {
2660 ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, &olen );
2661 ext_len += olen;
2662 }
Manuel Pégourié-Gonnard7b19c162013-08-15 18:01:11 +02002663#endif
2664
Manuel Pégourié-Gonnard55c7f992015-09-16 15:35:27 +02002665#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
2666 ssl_write_ecjpake_kkpp_ext( ssl, p + 2 + ext_len, &olen );
2667 ext_len += olen;
2668#endif
2669
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002670#if defined(MBEDTLS_SSL_ALPN)
Manuel Pégourié-Gonnard89e35792014-04-07 12:10:30 +02002671 ssl_write_alpn_ext( ssl, p + 2 + ext_len, &olen );
2672 ext_len += olen;
2673#endif
2674
Johan Pascalb62bb512015-12-03 21:56:45 +01002675#if defined(MBEDTLS_SSL_DTLS_SRTP)
Johan Pascalc3ccd982020-10-28 17:18:18 +01002676 ssl_write_use_srtp_ext( ssl, p + 2 + ext_len, &olen );
2677 ext_len += olen;
Johan Pascalb62bb512015-12-03 21:56:45 +01002678#endif
2679
Paul Elliottd48d5c62021-01-07 14:47:05 +00002680 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, total extension length: %" MBEDTLS_PRINTF_SIZET,
2681 ext_len ) );
Paul Bakker48916f92012-09-16 19:57:18 +00002682
Paul Bakkera7036632014-04-30 10:15:38 +02002683 if( ext_len > 0 )
2684 {
Joe Subbiani1f6c3ae2021-08-20 11:44:44 +01002685 MBEDTLS_PUT_UINT16_BE( ext_len, p, 0 );
Joe Subbiani94180e72021-08-20 16:20:44 +01002686 p += 2 + ext_len;
Paul Bakkera7036632014-04-30 10:15:38 +02002687 }
Paul Bakker5121ce52009-01-03 21:22:43 +00002688
2689 ssl->out_msglen = p - buf;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002690 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
2691 ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_HELLO;
Paul Bakker5121ce52009-01-03 21:22:43 +00002692
Manuel Pégourié-Gonnard31c15862017-09-13 09:38:11 +02002693 ret = mbedtls_ssl_write_handshake_msg( ssl );
Paul Bakker5121ce52009-01-03 21:22:43 +00002694
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002695 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002696
2697 return( ret );
2698}
2699
Gilles Peskineeccd8882020-03-10 12:19:08 +01002700#if !defined(MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002701static int ssl_write_certificate_request( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00002702{
Hanno Becker0d0cd4b2017-05-11 14:06:43 +01002703 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
Hanno Beckere694c3e2017-12-27 21:34:08 +00002704 ssl->handshake->ciphersuite_info;
Paul Bakker48f7a5d2013-04-19 14:30:58 +02002705
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002706 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02002707
Hanno Becker77adddc2019-02-07 12:32:43 +00002708 if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02002709 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002710 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02002711 ssl->state++;
2712 return( 0 );
2713 }
2714
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002715 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2716 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02002717}
Gilles Peskineeccd8882020-03-10 12:19:08 +01002718#else /* !MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002719static int ssl_write_certificate_request( mbedtls_ssl_context *ssl )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02002720{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002721 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
Hanno Becker0d0cd4b2017-05-11 14:06:43 +01002722 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
Hanno Beckere694c3e2017-12-27 21:34:08 +00002723 ssl->handshake->ciphersuite_info;
irwirc9bc3002020-04-01 13:46:36 +03002724 uint16_t dn_size, total_dn_size; /* excluding length bytes */
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02002725 size_t ct_len, sa_len; /* including length bytes */
Paul Bakker5121ce52009-01-03 21:22:43 +00002726 unsigned char *buf, *p;
Angus Grattond8213d02016-05-25 20:56:48 +10002727 const unsigned char * const end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002728 const mbedtls_x509_crt *crt;
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02002729 int authmode;
Paul Bakker5121ce52009-01-03 21:22:43 +00002730
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002731 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002732
2733 ssl->state++;
2734
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02002735#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
2736 if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET )
2737 authmode = ssl->handshake->sni_authmode;
2738 else
2739#endif
2740 authmode = ssl->conf->authmode;
2741
Hanno Becker77adddc2019-02-07 12:32:43 +00002742 if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) ||
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02002743 authmode == MBEDTLS_SSL_VERIFY_NONE )
Paul Bakker5121ce52009-01-03 21:22:43 +00002744 {
Johan Pascal4f099262020-09-22 10:59:26 +02002745 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
2746 return( 0 );
Paul Bakker5121ce52009-01-03 21:22:43 +00002747 }
2748
2749 /*
2750 * 0 . 0 handshake type
2751 * 1 . 3 handshake length
2752 * 4 . 4 cert type count
Paul Bakker926af752012-11-23 13:38:07 +01002753 * 5 .. m-1 cert types
2754 * m .. m+1 sig alg length (TLS 1.2 only)
Paul Bakker9af723c2014-05-01 13:03:14 +02002755 * m+1 .. n-1 SignatureAndHashAlgorithms (TLS 1.2 only)
Paul Bakker5121ce52009-01-03 21:22:43 +00002756 * n .. n+1 length of all DNs
2757 * n+2 .. n+3 length of DN 1
2758 * n+4 .. ... Distinguished Name #1
2759 * ... .. ... length of DN 2, etc.
2760 */
2761 buf = ssl->out_msg;
2762 p = buf + 4;
2763
2764 /*
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02002765 * Supported certificate types
2766 *
2767 * ClientCertificateType certificate_types<1..2^8-1>;
2768 * enum { (255) } ClientCertificateType;
Paul Bakker5121ce52009-01-03 21:22:43 +00002769 */
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02002770 ct_len = 0;
Paul Bakker926af752012-11-23 13:38:07 +01002771
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002772#if defined(MBEDTLS_RSA_C)
2773 p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_RSA_SIGN;
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02002774#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002775#if defined(MBEDTLS_ECDSA_C)
2776 p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_ECDSA_SIGN;
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02002777#endif
2778
Paul Bakkerb9cfaa02013-10-11 18:58:55 +02002779 p[0] = (unsigned char) ct_len++;
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02002780 p += ct_len;
Paul Bakker926af752012-11-23 13:38:07 +01002781
Paul Bakker577e0062013-08-28 11:57:20 +02002782 sa_len = 0;
Jerry Yue7541932022-01-28 10:21:24 +08002783
Paul Bakker926af752012-11-23 13:38:07 +01002784 /*
2785 * Add signature_algorithms for verify (TLS 1.2)
Paul Bakker926af752012-11-23 13:38:07 +01002786 *
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02002787 * SignatureAndHashAlgorithm supported_signature_algorithms<2..2^16-2>;
2788 *
2789 * struct {
2790 * HashAlgorithm hash;
2791 * SignatureAlgorithm signature;
2792 * } SignatureAndHashAlgorithm;
2793 *
2794 * enum { (255) } HashAlgorithm;
2795 * enum { (255) } SignatureAlgorithm;
Paul Bakker926af752012-11-23 13:38:07 +01002796 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002797 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
Paul Bakker926af752012-11-23 13:38:07 +01002798 {
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02002799 /*
2800 * Supported signature algorithms
2801 */
Jerry Yu6106fdc2022-01-12 16:36:14 +08002802 const uint16_t *sig_alg = mbedtls_ssl_get_sig_algs( ssl );
2803 if( sig_alg == NULL )
2804 return( MBEDTLS_ERR_SSL_BAD_CONFIG );
2805
2806 for( ; *sig_alg != MBEDTLS_TLS1_3_SIG_NONE; sig_alg++ )
Simon Butcher99000142016-10-13 17:21:01 +01002807 {
Jerry Yu713013f2022-01-17 18:16:35 +08002808 unsigned char hash = MBEDTLS_BYTE_1( *sig_alg );
Simon Butcher99000142016-10-13 17:21:01 +01002809
Jerry Yu713013f2022-01-17 18:16:35 +08002810 if( mbedtls_ssl_set_calc_verify_md( ssl, hash ) )
Simon Butcher99000142016-10-13 17:21:01 +01002811 continue;
Jerry Yu1bab3012022-01-19 17:43:22 +08002812 if( ! mbedtls_ssl_sig_alg_is_supported( ssl, *sig_alg ) )
Jerry Yu1abd1bc2021-12-21 21:27:48 +08002813 continue;
Simon Butcher99000142016-10-13 17:21:01 +01002814
Jerry Yu1abd1bc2021-12-21 21:27:48 +08002815 MBEDTLS_PUT_UINT16_BE( *sig_alg, p, sa_len );
2816 sa_len += 2;
Simon Butcher99000142016-10-13 17:21:01 +01002817 }
Paul Bakker926af752012-11-23 13:38:07 +01002818
Joe Subbiani6dd73642021-07-19 11:56:54 +01002819 MBEDTLS_PUT_UINT16_BE( sa_len, p, 0 );
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02002820 sa_len += 2;
2821 p += sa_len;
Paul Bakker926af752012-11-23 13:38:07 +01002822 }
Paul Bakker5121ce52009-01-03 21:22:43 +00002823
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02002824 /*
2825 * DistinguishedName certificate_authorities<0..2^16-1>;
2826 * opaque DistinguishedName<1..2^16-1>;
2827 */
Paul Bakker5121ce52009-01-03 21:22:43 +00002828 p += 2;
Paul Bakker5121ce52009-01-03 21:22:43 +00002829
Paul Bakkerbc3d9842012-11-26 16:12:02 +01002830 total_dn_size = 0;
Janos Follath088ce432017-04-10 12:42:31 +01002831
2832 if( ssl->conf->cert_req_ca_list == MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED )
Paul Bakker5121ce52009-01-03 21:22:43 +00002833 {
Hanno Becker8bf74f32019-03-27 11:01:30 +00002834 /* NOTE: If trusted certificates are provisioned
2835 * via a CA callback (configured through
2836 * `mbedtls_ssl_conf_ca_cb()`, then the
2837 * CertificateRequest is currently left empty. */
2838
Janos Follath088ce432017-04-10 12:42:31 +01002839#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
2840 if( ssl->handshake->sni_ca_chain != NULL )
2841 crt = ssl->handshake->sni_ca_chain;
2842 else
2843#endif
2844 crt = ssl->conf->ca_chain;
Manuel Pégourié-Gonnardbc1babb2015-10-02 11:16:47 +02002845
Janos Follath088ce432017-04-10 12:42:31 +01002846 while( crt != NULL && crt->version != 0 )
Manuel Pégourié-Gonnardbc1babb2015-10-02 11:16:47 +02002847 {
irwirc9bc3002020-04-01 13:46:36 +03002848 /* It follows from RFC 5280 A.1 that this length
2849 * can be represented in at most 11 bits. */
2850 dn_size = (uint16_t) crt->subject_raw.len;
Janos Follath088ce432017-04-10 12:42:31 +01002851
irwirc9bc3002020-04-01 13:46:36 +03002852 if( end < p || (size_t)( end - p ) < 2 + (size_t) dn_size )
Janos Follath088ce432017-04-10 12:42:31 +01002853 {
2854 MBEDTLS_SSL_DEBUG_MSG( 1, ( "skipping CAs: buffer too short" ) );
2855 break;
2856 }
2857
Joe Subbiani1f6c3ae2021-08-20 11:44:44 +01002858 MBEDTLS_PUT_UINT16_BE( dn_size, p, 0 );
2859 p += 2;
Janos Follath088ce432017-04-10 12:42:31 +01002860 memcpy( p, crt->subject_raw.p, dn_size );
2861 p += dn_size;
2862
2863 MBEDTLS_SSL_DEBUG_BUF( 3, "requested DN", p - dn_size, dn_size );
2864
2865 total_dn_size += 2 + dn_size;
2866 crt = crt->next;
Manuel Pégourié-Gonnardbc1babb2015-10-02 11:16:47 +02002867 }
Paul Bakker5121ce52009-01-03 21:22:43 +00002868 }
2869
Paul Bakker926af752012-11-23 13:38:07 +01002870 ssl->out_msglen = p - buf;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002871 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
2872 ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE_REQUEST;
Joe Subbiani6dd73642021-07-19 11:56:54 +01002873 MBEDTLS_PUT_UINT16_BE( total_dn_size, ssl->out_msg, 4 + ct_len + sa_len );
Paul Bakker5121ce52009-01-03 21:22:43 +00002874
Manuel Pégourié-Gonnard31c15862017-09-13 09:38:11 +02002875 ret = mbedtls_ssl_write_handshake_msg( ssl );
Paul Bakker5121ce52009-01-03 21:22:43 +00002876
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002877 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002878
2879 return( ret );
2880}
Gilles Peskineeccd8882020-03-10 12:19:08 +01002881#endif /* MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED */
Paul Bakker5121ce52009-01-03 21:22:43 +00002882
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002883#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
2884 defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
2885static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard55389702013-12-12 11:14:16 +01002886{
Janos Follath865b3eb2019-12-16 11:46:15 +00002887 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
Manuel Pégourié-Gonnard55389702013-12-12 11:14:16 +01002888
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002889 if( ! mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), MBEDTLS_PK_ECKEY ) )
Manuel Pégourié-Gonnard55389702013-12-12 11:14:16 +01002890 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002891 MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key not ECDH capable" ) );
2892 return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
Manuel Pégourié-Gonnard55389702013-12-12 11:14:16 +01002893 }
2894
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002895 if( ( ret = mbedtls_ecdh_get_params( &ssl->handshake->ecdh_ctx,
2896 mbedtls_pk_ec( *mbedtls_ssl_own_key( ssl ) ),
2897 MBEDTLS_ECDH_OURS ) ) != 0 )
Manuel Pégourié-Gonnard55389702013-12-12 11:14:16 +01002898 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002899 MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_get_params" ), ret );
Manuel Pégourié-Gonnard55389702013-12-12 11:14:16 +01002900 return( ret );
2901 }
2902
2903 return( 0 );
2904}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002905#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) ||
2906 MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
Manuel Pégourié-Gonnard55389702013-12-12 11:14:16 +01002907
Gilles Peskineeccd8882020-03-10 12:19:08 +01002908#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED) && \
Gilles Peskineb74a1c72018-04-24 13:09:22 +02002909 defined(MBEDTLS_SSL_ASYNC_PRIVATE)
Gilles Peskineebd30ae2018-01-06 03:34:20 +01002910static int ssl_resume_server_key_exchange( mbedtls_ssl_context *ssl,
Gilles Peskine0fd90dd2018-04-26 07:41:09 +02002911 size_t *signature_len )
Paul Bakker41c83d32013-03-20 14:39:14 +01002912{
Gilles Peskine0fd90dd2018-04-26 07:41:09 +02002913 /* Append the signature to ssl->out_msg, leaving 2 bytes for the
2914 * signature length which will be added in ssl_write_server_key_exchange
2915 * after the call to ssl_prepare_server_key_exchange.
2916 * ssl_write_server_key_exchange also takes care of incrementing
2917 * ssl->out_msglen. */
2918 unsigned char *sig_start = ssl->out_msg + ssl->out_msglen + 2;
Angus Grattond8213d02016-05-25 20:56:48 +10002919 size_t sig_max_len = ( ssl->out_buf + MBEDTLS_SSL_OUT_CONTENT_LEN
Gilles Peskine0fd90dd2018-04-26 07:41:09 +02002920 - sig_start );
Gilles Peskine8f97af72018-04-26 11:46:10 +02002921 int ret = ssl->conf->f_async_resume( ssl,
Gilles Peskine0fd90dd2018-04-26 07:41:09 +02002922 sig_start, signature_len, sig_max_len );
Gilles Peskineebd30ae2018-01-06 03:34:20 +01002923 if( ret != MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS )
2924 {
Gilles Peskinedf13d5c2018-04-25 20:39:48 +02002925 ssl->handshake->async_in_progress = 0;
Gilles Peskine1febfef2018-04-30 11:54:39 +02002926 mbedtls_ssl_set_async_operation_data( ssl, NULL );
Gilles Peskineebd30ae2018-01-06 03:34:20 +01002927 }
Gilles Peskined3eb0612018-01-08 17:07:44 +01002928 MBEDTLS_SSL_DEBUG_RET( 2, "ssl_resume_server_key_exchange", ret );
Gilles Peskineebd30ae2018-01-06 03:34:20 +01002929 return( ret );
2930}
Gilles Peskineeccd8882020-03-10 12:19:08 +01002931#endif /* defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED) &&
Gilles Peskineb74a1c72018-04-24 13:09:22 +02002932 defined(MBEDTLS_SSL_ASYNC_PRIVATE) */
Gilles Peskineebd30ae2018-01-06 03:34:20 +01002933
Gilles Peskined3eb0612018-01-08 17:07:44 +01002934/* Prepare the ServerKeyExchange message, up to and including
Gilles Peskine168dae82018-04-25 23:35:42 +02002935 * calculating the signature if any, but excluding formatting the
2936 * signature and sending the message. */
Gilles Peskine7ab013a2018-01-08 17:04:16 +01002937static int ssl_prepare_server_key_exchange( mbedtls_ssl_context *ssl,
2938 size_t *signature_len )
Paul Bakker5690efc2011-05-26 13:16:06 +00002939{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002940 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
Hanno Beckere694c3e2017-12-27 21:34:08 +00002941 ssl->handshake->ciphersuite_info;
2942
Gilles Peskineeccd8882020-03-10 12:19:08 +01002943#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PFS_ENABLED)
Jerry Yuc5aef882021-12-23 20:15:02 +08002944#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED)
Gilles Peskine3ce9b902018-01-06 01:34:21 +01002945 unsigned char *dig_signed = NULL;
Jerry Yuc5aef882021-12-23 20:15:02 +08002946#endif /* MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED */
Gilles Peskineeccd8882020-03-10 12:19:08 +01002947#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PFS_ENABLED */
Paul Bakker41c83d32013-03-20 14:39:14 +01002948
Gilles Peskine184a3fa2018-01-06 01:46:17 +01002949 (void) ciphersuite_info; /* unused in some configurations */
Gilles Peskineeccd8882020-03-10 12:19:08 +01002950#if !defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED)
Gilles Peskine22e695f2018-04-26 00:22:50 +02002951 (void) signature_len;
Gilles Peskineeccd8882020-03-10 12:19:08 +01002952#endif /* MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED */
Paul Bakker41c83d32013-03-20 14:39:14 +01002953
Gilles Peskine16fe8fc2021-06-22 09:45:56 +02002954#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED)
Gilles Peskinef00f1522021-06-22 00:09:00 +02002955#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
2956 size_t out_buf_len = ssl->out_buf_len - ( ssl->out_msg - ssl->out_buf );
2957#else
2958 size_t out_buf_len = MBEDTLS_SSL_OUT_BUFFER_LEN - ( ssl->out_msg - ssl->out_buf );
2959#endif
Gilles Peskine16fe8fc2021-06-22 09:45:56 +02002960#endif
Gilles Peskinef00f1522021-06-22 00:09:00 +02002961
Gilles Peskinef9f15ae2018-01-08 17:13:01 +01002962 ssl->out_msglen = 4; /* header (type:1, length:3) to be written later */
Paul Bakker5121ce52009-01-03 21:22:43 +00002963
Hanno Beckercf7ae7e2017-05-11 14:07:25 +01002964 /*
2965 *
Gilles Peskine184a3fa2018-01-06 01:46:17 +01002966 * Part 1: Provide key exchange parameters for chosen ciphersuite.
Hanno Becker0d0cd4b2017-05-11 14:06:43 +01002967 *
2968 */
2969
2970 /*
2971 * - ECJPAKE key exchanges
2972 */
Manuel Pégourié-Gonnard0f1660a2015-09-16 22:41:06 +02002973#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
2974 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
2975 {
Janos Follath865b3eb2019-12-16 11:46:15 +00002976 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
Simon Butcher600c5e62018-06-14 08:58:59 +01002977 size_t len = 0;
Manuel Pégourié-Gonnard0f1660a2015-09-16 22:41:06 +02002978
Gilles Peskinef9f15ae2018-01-08 17:13:01 +01002979 ret = mbedtls_ecjpake_write_round_two(
2980 &ssl->handshake->ecjpake_ctx,
2981 ssl->out_msg + ssl->out_msglen,
Angus Grattond8213d02016-05-25 20:56:48 +10002982 MBEDTLS_SSL_OUT_CONTENT_LEN - ssl->out_msglen, &len,
Gilles Peskinef9f15ae2018-01-08 17:13:01 +01002983 ssl->conf->f_rng, ssl->conf->p_rng );
Manuel Pégourié-Gonnard0f1660a2015-09-16 22:41:06 +02002984 if( ret != 0 )
2985 {
2986 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_write_round_two", ret );
2987 return( ret );
2988 }
2989
Gilles Peskinef9f15ae2018-01-08 17:13:01 +01002990 ssl->out_msglen += len;
Manuel Pégourié-Gonnard0f1660a2015-09-16 22:41:06 +02002991 }
2992#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
2993
Hanno Becker1aa267c2017-04-28 17:08:27 +01002994 /*
2995 * For (EC)DHE key exchanges with PSK, parameters are prefixed by support
2996 * identity hint (RFC 4279, Sec. 3). Until someone needs this feature,
2997 * we use empty support identity hints here.
2998 **/
2999#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) || \
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003000 defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
3001 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
3002 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003003 {
Gilles Peskinef9f15ae2018-01-08 17:13:01 +01003004 ssl->out_msg[ssl->out_msglen++] = 0x00;
3005 ssl->out_msg[ssl->out_msglen++] = 0x00;
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003006 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003007#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED ||
3008 MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003009
Hanno Becker7e5437a2017-04-28 17:15:26 +01003010 /*
Hanno Beckercf7ae7e2017-05-11 14:07:25 +01003011 * - DHE key exchanges
Hanno Becker1aa267c2017-04-28 17:08:27 +01003012 */
Gilles Peskineeccd8882020-03-10 12:19:08 +01003013#if defined(MBEDTLS_KEY_EXCHANGE_SOME_DHE_ENABLED)
Hanno Becker1aa267c2017-04-28 17:08:27 +01003014 if( mbedtls_ssl_ciphersuite_uses_dhe( ciphersuite_info ) )
Paul Bakker48916f92012-09-16 19:57:18 +00003015 {
Janos Follath865b3eb2019-12-16 11:46:15 +00003016 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
Simon Butcher600c5e62018-06-14 08:58:59 +01003017 size_t len = 0;
Gilles Peskine184a3fa2018-01-06 01:46:17 +01003018
Manuel Pégourié-Gonnard1028b742015-05-06 17:33:07 +01003019 if( ssl->conf->dhm_P.p == NULL || ssl->conf->dhm_G.p == NULL )
3020 {
3021 MBEDTLS_SSL_DEBUG_MSG( 1, ( "no DH parameters set" ) );
3022 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
3023 }
3024
Paul Bakker41c83d32013-03-20 14:39:14 +01003025 /*
3026 * Ephemeral DH parameters:
3027 *
3028 * struct {
3029 * opaque dh_p<1..2^16-1>;
3030 * opaque dh_g<1..2^16-1>;
3031 * opaque dh_Ys<1..2^16-1>;
3032 * } ServerDHParams;
3033 */
Hanno Beckerab740562017-10-04 13:15:37 +01003034 if( ( ret = mbedtls_dhm_set_group( &ssl->handshake->dhm_ctx,
3035 &ssl->conf->dhm_P,
3036 &ssl->conf->dhm_G ) ) != 0 )
Paul Bakker41c83d32013-03-20 14:39:14 +01003037 {
Hanno Beckerab740562017-10-04 13:15:37 +01003038 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_set_group", ret );
Paul Bakker41c83d32013-03-20 14:39:14 +01003039 return( ret );
3040 }
Paul Bakker48916f92012-09-16 19:57:18 +00003041
Gilles Peskinef9f15ae2018-01-08 17:13:01 +01003042 if( ( ret = mbedtls_dhm_make_params(
3043 &ssl->handshake->dhm_ctx,
Gilles Peskine487bbf62021-05-27 22:17:07 +02003044 (int) mbedtls_dhm_get_len( &ssl->handshake->dhm_ctx ),
Gilles Peskinef9f15ae2018-01-08 17:13:01 +01003045 ssl->out_msg + ssl->out_msglen, &len,
3046 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
Paul Bakker41c83d32013-03-20 14:39:14 +01003047 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003048 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_params", ret );
Paul Bakker41c83d32013-03-20 14:39:14 +01003049 return( ret );
3050 }
3051
Jerry Yuc5aef882021-12-23 20:15:02 +08003052#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED)
Gilles Peskinef9f15ae2018-01-08 17:13:01 +01003053 dig_signed = ssl->out_msg + ssl->out_msglen;
Hanno Becker0d0cd4b2017-05-11 14:06:43 +01003054#endif
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003055
Gilles Peskinef9f15ae2018-01-08 17:13:01 +01003056 ssl->out_msglen += len;
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003057
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003058 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->handshake->dhm_ctx.X );
3059 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->handshake->dhm_ctx.P );
3060 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G );
3061 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->handshake->dhm_ctx.GX );
Paul Bakker41c83d32013-03-20 14:39:14 +01003062 }
Gilles Peskineeccd8882020-03-10 12:19:08 +01003063#endif /* MBEDTLS_KEY_EXCHANGE_SOME_DHE_ENABLED */
Paul Bakker41c83d32013-03-20 14:39:14 +01003064
Hanno Becker1aa267c2017-04-28 17:08:27 +01003065 /*
Hanno Beckercf7ae7e2017-05-11 14:07:25 +01003066 * - ECDHE key exchanges
Hanno Becker1aa267c2017-04-28 17:08:27 +01003067 */
Gilles Peskineeccd8882020-03-10 12:19:08 +01003068#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDHE_ENABLED)
Hanno Becker1aa267c2017-04-28 17:08:27 +01003069 if( mbedtls_ssl_ciphersuite_uses_ecdhe( ciphersuite_info ) )
Paul Bakker5121ce52009-01-03 21:22:43 +00003070 {
Paul Bakker41c83d32013-03-20 14:39:14 +01003071 /*
3072 * Ephemeral ECDH parameters:
3073 *
3074 * struct {
3075 * ECParameters curve_params;
3076 * ECPoint public;
3077 * } ServerECDHParams;
3078 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003079 const mbedtls_ecp_curve_info **curve = NULL;
Brett Warren01f3dae2021-08-17 13:50:51 +01003080 const uint16_t *group_list = mbedtls_ssl_get_groups( ssl );
Janos Follath865b3eb2019-12-16 11:46:15 +00003081 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
Simon Butcher600c5e62018-06-14 08:58:59 +01003082 size_t len = 0;
Gergely Budai987bfb52014-01-19 21:48:42 +01003083
Manuel Pégourié-Gonnardc3f6b62c2014-02-06 10:13:09 +01003084 /* Match our preference list against the offered curves */
Brett Warren01f3dae2021-08-17 13:50:51 +01003085 if( group_list == NULL )
3086 return( MBEDTLS_ERR_SSL_BAD_CONFIG );
3087 for( ; *group_list != 0; group_list++ )
Manuel Pégourié-Gonnardc3f6b62c2014-02-06 10:13:09 +01003088 for( curve = ssl->handshake->curves; *curve != NULL; curve++ )
Brett Warren01f3dae2021-08-17 13:50:51 +01003089 if( (*curve)->tls_id == *group_list )
Manuel Pégourié-Gonnardc3f6b62c2014-02-06 10:13:09 +01003090 goto curve_matching_done;
3091
3092curve_matching_done:
Manuel Pégourié-Gonnardb86145e2015-06-23 14:11:39 +02003093 if( curve == NULL || *curve == NULL )
Gergely Budai987bfb52014-01-19 21:48:42 +01003094 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003095 MBEDTLS_SSL_DEBUG_MSG( 1, ( "no matching curve for ECDHE" ) );
Dave Rodgmanbb05cd02021-06-29 10:37:43 +01003096 return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
Gergely Budai987bfb52014-01-19 21:48:42 +01003097 }
Manuel Pégourié-Gonnardde053902014-02-04 13:58:39 +01003098
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003099 MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDHE curve: %s", (*curve)->name ) );
Gergely Budai987bfb52014-01-19 21:48:42 +01003100
Przemek Stekielb6ce0b62022-03-09 15:38:24 +01003101#if defined(MBEDTLS_USE_PSA_CRYPTO)
Przemek Stekielce1d7922022-03-14 16:16:25 +01003102 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA ||
3103 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
Paul Bakker41c83d32013-03-20 14:39:14 +01003104 {
Przemek Stekielfc91a1f2022-03-14 12:05:27 +01003105 psa_status_t status = PSA_ERROR_GENERIC_ERROR;
3106 psa_key_attributes_t key_attributes;
3107 mbedtls_ssl_handshake_params *handshake = ssl->handshake;
3108 size_t ecdh_bits = 0;
3109 uint8_t *p = ssl->out_msg + ssl->out_msglen;
Przemek Stekiela4e15cc2022-03-16 11:32:42 +01003110 const size_t header_size = 4; // curve_type(1), namedcurve(2),
3111 // data length(1)
Przemek Stekielfc91a1f2022-03-14 12:05:27 +01003112 const size_t data_length_size = 1;
Paul Bakker5121ce52009-01-03 21:22:43 +00003113
Przemek Stekielfc91a1f2022-03-14 12:05:27 +01003114 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Perform PSA-based ECDH computation." ) );
3115
3116 /* Convert EC group to PSA key type. */
3117 handshake->ecdh_psa_type = mbedtls_psa_parse_tls_ecc_group(
3118 (*curve)->tls_id, &ecdh_bits );
3119
3120 if( handshake->ecdh_psa_type == 0 || ecdh_bits > 0xffff )
3121 {
3122 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Invalid ecc group parse." ) );
3123 return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
3124 }
3125 handshake->ecdh_bits = (uint16_t) ecdh_bits;
3126
3127 key_attributes = psa_key_attributes_init();
3128 psa_set_key_usage_flags( &key_attributes, PSA_KEY_USAGE_DERIVE );
3129 psa_set_key_algorithm( &key_attributes, PSA_ALG_ECDH );
3130 psa_set_key_type( &key_attributes, handshake->ecdh_psa_type );
3131 psa_set_key_bits( &key_attributes, handshake->ecdh_bits );
3132
3133 /*
Przemek Stekiel338b61d2022-03-15 08:03:43 +01003134 * ECParameters curve_params
3135 *
3136 * First byte is curve_type, always named_curve
3137 */
Przemek Stekielfc91a1f2022-03-14 12:05:27 +01003138 *p++ = MBEDTLS_ECP_TLS_NAMED_CURVE;
3139
3140 /*
Przemek Stekiel338b61d2022-03-15 08:03:43 +01003141 * Next two bytes are the namedcurve value
3142 */
Przemek Stekielfc91a1f2022-03-14 12:05:27 +01003143 MBEDTLS_PUT_UINT16_BE( (*curve)->tls_id, p, 0 );
3144 p += 2;
3145
3146 /* Generate ECDH private key. */
3147 status = psa_generate_key( &key_attributes,
Przemek Stekiel338b61d2022-03-15 08:03:43 +01003148 &handshake->ecdh_psa_privkey );
Przemek Stekielfc91a1f2022-03-14 12:05:27 +01003149 if( status != PSA_SUCCESS )
3150 {
3151 ret = psa_ssl_status_to_mbedtls( status );
3152 MBEDTLS_SSL_DEBUG_RET( 1, "psa_generate_key", ret );
3153 return( ret );
3154 }
3155
3156 /*
Przemek Stekiel338b61d2022-03-15 08:03:43 +01003157 * ECPoint public
3158 *
3159 * First byte is data length.
3160 * It will be filled later. p holds now the data length location.
3161 */
Przemek Stekielfc91a1f2022-03-14 12:05:27 +01003162
3163 /* Export the public part of the ECDH private key from PSA.
Przemek Stekiel338b61d2022-03-15 08:03:43 +01003164 * Make one byte space for the length.
3165 */
Przemek Stekielfc91a1f2022-03-14 12:05:27 +01003166 unsigned char *own_pubkey = p + data_length_size;
Przemek Stekieldd482bf2022-03-16 11:43:22 +01003167
Przemek Stekielfc91a1f2022-03-14 12:05:27 +01003168 size_t own_pubkey_max_len = (size_t)( MBEDTLS_SSL_OUT_CONTENT_LEN
Przemek Stekieldd482bf2022-03-16 11:43:22 +01003169 - ( own_pubkey - ssl->out_msg ) );
Przemek Stekielfc91a1f2022-03-14 12:05:27 +01003170
3171 status = psa_export_public_key( handshake->ecdh_psa_privkey,
Przemek Stekiel338b61d2022-03-15 08:03:43 +01003172 own_pubkey, own_pubkey_max_len,
3173 &len );
Przemek Stekielfc91a1f2022-03-14 12:05:27 +01003174 if( status != PSA_SUCCESS )
3175 {
3176 ret = psa_ssl_status_to_mbedtls( status );
3177 MBEDTLS_SSL_DEBUG_RET( 1, "psa_export_public_key", ret );
3178 (void) psa_destroy_key( handshake->ecdh_psa_privkey );
3179 handshake->ecdh_psa_privkey = MBEDTLS_SVC_KEY_ID_INIT;
3180 return( ret );
3181 }
3182
3183 /* Store the length of the exported public key. */
3184 *p = (uint8_t) len;
3185
3186 /* Determine full message length. */
3187 len += header_size;
Przemek Stekielb6ce0b62022-03-09 15:38:24 +01003188 }
Przemek Stekielfc91a1f2022-03-14 12:05:27 +01003189 else
Przemek Stekielce1d7922022-03-14 16:16:25 +01003190#endif /* MBEDTLS_USE_PSA_CRYPTO */
Paul Bakker41c83d32013-03-20 14:39:14 +01003191 {
Przemek Stekiel855938e2022-03-16 11:29:29 +01003192 if( ( ret = mbedtls_ecdh_setup( &ssl->handshake->ecdh_ctx,
3193 (*curve)->grp_id ) ) != 0 )
3194 {
3195 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecp_group_load", ret );
3196 return( ret );
3197 }
3198
3199 if( ( ret = mbedtls_ecdh_make_params(
3200 &ssl->handshake->ecdh_ctx, &len,
3201 ssl->out_msg + ssl->out_msglen,
3202 MBEDTLS_SSL_OUT_CONTENT_LEN - ssl->out_msglen,
3203 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
3204 {
3205 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_params", ret );
3206 return( ret );
3207 }
Paul Bakker41c83d32013-03-20 14:39:14 +01003208 }
3209
Jerry Yuc5aef882021-12-23 20:15:02 +08003210#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED)
Gilles Peskinef9f15ae2018-01-08 17:13:01 +01003211 dig_signed = ssl->out_msg + ssl->out_msglen;
Hanno Beckercf7ae7e2017-05-11 14:07:25 +01003212#endif
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003213
Gilles Peskinef9f15ae2018-01-08 17:13:01 +01003214 ssl->out_msglen += len;
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003215
Andrzej Kurekc470b6b2019-01-31 08:20:20 -05003216 MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx,
3217 MBEDTLS_DEBUG_ECDH_Q );
Paul Bakker41c83d32013-03-20 14:39:14 +01003218 }
Gilles Peskineeccd8882020-03-10 12:19:08 +01003219#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDHE_ENABLED */
Paul Bakker5121ce52009-01-03 21:22:43 +00003220
Hanno Becker1aa267c2017-04-28 17:08:27 +01003221 /*
Hanno Beckercf7ae7e2017-05-11 14:07:25 +01003222 *
Gilles Peskine184a3fa2018-01-06 01:46:17 +01003223 * Part 2: For key exchanges involving the server signing the
Hanno Beckercf7ae7e2017-05-11 14:07:25 +01003224 * exchange parameters, compute and add the signature here.
3225 *
Hanno Becker1aa267c2017-04-28 17:08:27 +01003226 */
Gilles Peskineeccd8882020-03-10 12:19:08 +01003227#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED)
Hanno Becker1aa267c2017-04-28 17:08:27 +01003228 if( mbedtls_ssl_ciphersuite_uses_server_signature( ciphersuite_info ) )
Paul Bakker1ef83d62012-04-11 12:09:53 +00003229 {
Gilles Peskine1004c192018-01-08 16:59:14 +01003230 size_t dig_signed_len = ssl->out_msg + ssl->out_msglen - dig_signed;
Gilles Peskineca1d7422018-04-24 11:53:22 +02003231 size_t hashlen = 0;
Ronald Cron69a63422021-10-18 09:47:58 +02003232#if defined(MBEDTLS_USE_PSA_CRYPTO)
3233 unsigned char hash[PSA_HASH_MAX_SIZE];
3234#else
Gilles Peskinee1efdf92018-01-05 21:18:37 +01003235 unsigned char hash[MBEDTLS_MD_MAX_SIZE];
Ronald Cron69a63422021-10-18 09:47:58 +02003236#endif
Janos Follath865b3eb2019-12-16 11:46:15 +00003237 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
Paul Bakker23f36802012-09-28 14:15:14 +00003238
Manuel Pégourié-Gonnardabae74c2013-08-20 13:53:44 +02003239 /*
Gilles Peskine184a3fa2018-01-06 01:46:17 +01003240 * 2.1: Choose hash algorithm:
TRodziewicz4ca18aa2021-05-20 14:46:20 +02003241 * For TLS 1.2, obey signature-hash-algorithm extension
3242 * to choose appropriate hash.
Manuel Pégourié-Gonnard4bd12842013-08-27 13:31:28 +02003243 */
Hanno Becker7e5437a2017-04-28 17:15:26 +01003244
Jerry Yuc5aef882021-12-23 20:15:02 +08003245 mbedtls_md_type_t md_alg;
Hanno Becker7e5437a2017-04-28 17:15:26 +01003246
Hanno Becker0d0cd4b2017-05-11 14:06:43 +01003247 mbedtls_pk_type_t sig_alg =
3248 mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003249 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
Manuel Pégourié-Gonnard4bd12842013-08-27 13:31:28 +02003250 {
TRodziewicz4ca18aa2021-05-20 14:46:20 +02003251 /* For TLS 1.2, obey signature-hash-algorithm extension
Hanno Becker0d0cd4b2017-05-11 14:06:43 +01003252 * (RFC 5246, Sec. 7.4.1.4.1). */
Hanno Becker7e5437a2017-04-28 17:15:26 +01003253 if( sig_alg == MBEDTLS_PK_NONE ||
Hanno Becker0d0cd4b2017-05-11 14:06:43 +01003254 ( md_alg = mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs,
3255 sig_alg ) ) == MBEDTLS_MD_NONE )
Manuel Pégourié-Gonnard4bd12842013-08-27 13:31:28 +02003256 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003257 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
Hanno Becker4cb1f4d2017-10-10 15:59:57 +01003258 /* (... because we choose a cipher suite
Hanno Becker0d0cd4b2017-05-11 14:06:43 +01003259 * only if there is a matching hash.) */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003260 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard4bd12842013-08-27 13:31:28 +02003261 }
3262 }
Paul Bakker577e0062013-08-28 11:57:20 +02003263 else
Manuel Pégourié-Gonnard4bd12842013-08-27 13:31:28 +02003264 {
TRodziewicz4ca18aa2021-05-20 14:46:20 +02003265 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
3266 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard4bd12842013-08-27 13:31:28 +02003267 }
3268
Paul Elliott3891caf2020-12-17 18:42:40 +00003269 MBEDTLS_SSL_DEBUG_MSG( 3, ( "pick hash algorithm %u for signing", (unsigned) md_alg ) );
Hanno Becker7e5437a2017-04-28 17:15:26 +01003270
Manuel Pégourié-Gonnard4bd12842013-08-27 13:31:28 +02003271 /*
Gilles Peskine184a3fa2018-01-06 01:46:17 +01003272 * 2.2: Compute the hash to be signed
Manuel Pégourié-Gonnardabae74c2013-08-20 13:53:44 +02003273 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003274 if( md_alg != MBEDTLS_MD_NONE )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003275 {
Gilles Peskineca1d7422018-04-24 11:53:22 +02003276 ret = mbedtls_ssl_get_key_exchange_md_tls1_2( ssl, hash, &hashlen,
Andres Amaya Garcia46f5a3e2017-07-20 16:17:51 +01003277 dig_signed,
3278 dig_signed_len,
3279 md_alg );
3280 if( ret != 0 )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003281 return( ret );
Paul Bakker23f36802012-09-28 14:15:14 +00003282 }
Paul Bakkerd2f068e2013-08-27 21:19:20 +02003283 else
Paul Bakker577e0062013-08-28 11:57:20 +02003284 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003285 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
3286 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakker577e0062013-08-28 11:57:20 +02003287 }
Paul Bakkerc70b9822013-04-07 22:00:46 +02003288
Gilles Peskineebd652f2018-01-05 21:18:59 +01003289 MBEDTLS_SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003290
Manuel Pégourié-Gonnardabae74c2013-08-20 13:53:44 +02003291 /*
Gilles Peskine184a3fa2018-01-06 01:46:17 +01003292 * 2.3: Compute and add the signature
Manuel Pégourié-Gonnardabae74c2013-08-20 13:53:44 +02003293 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003294 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
Paul Bakker23f36802012-09-28 14:15:14 +00003295 {
Hanno Beckercf7ae7e2017-05-11 14:07:25 +01003296 /*
3297 * For TLS 1.2, we need to specify signature and hash algorithm
Hanno Becker7e5437a2017-04-28 17:15:26 +01003298 * explicitly through a prefix to the signature.
3299 *
3300 * struct {
3301 * HashAlgorithm hash;
3302 * SignatureAlgorithm signature;
3303 * } SignatureAndHashAlgorithm;
3304 *
3305 * struct {
3306 * SignatureAndHashAlgorithm algorithm;
3307 * opaque signature<0..2^16-1>;
3308 * } DigitallySigned;
3309 *
3310 */
3311
Gilles Peskine1004c192018-01-08 16:59:14 +01003312 ssl->out_msg[ssl->out_msglen++] =
3313 mbedtls_ssl_hash_from_md_alg( md_alg );
3314 ssl->out_msg[ssl->out_msglen++] =
3315 mbedtls_ssl_sig_from_pk_alg( sig_alg );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003316 }
3317
Gilles Peskineb74a1c72018-04-24 13:09:22 +02003318#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
Gilles Peskine4bf9a282018-01-05 21:20:50 +01003319 if( ssl->conf->f_async_sign_start != NULL )
3320 {
Gilles Peskine8f97af72018-04-26 11:46:10 +02003321 ret = ssl->conf->f_async_sign_start( ssl,
Gilles Peskinedf13d5c2018-04-25 20:39:48 +02003322 mbedtls_ssl_own_cert( ssl ),
3323 md_alg, hash, hashlen );
Gilles Peskine4bf9a282018-01-05 21:20:50 +01003324 switch( ret )
3325 {
3326 case MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH:
3327 /* act as if f_async_sign was null */
3328 break;
3329 case 0:
Gilles Peskinedf13d5c2018-04-25 20:39:48 +02003330 ssl->handshake->async_in_progress = 1;
Gilles Peskineebd30ae2018-01-06 03:34:20 +01003331 return( ssl_resume_server_key_exchange( ssl, signature_len ) );
Gilles Peskine4bf9a282018-01-05 21:20:50 +01003332 case MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS:
Gilles Peskinedf13d5c2018-04-25 20:39:48 +02003333 ssl->handshake->async_in_progress = 1;
Gilles Peskine4bf9a282018-01-05 21:20:50 +01003334 return( MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS );
3335 default:
Gilles Peskinedf13d5c2018-04-25 20:39:48 +02003336 MBEDTLS_SSL_DEBUG_RET( 1, "f_async_sign_start", ret );
Gilles Peskine4bf9a282018-01-05 21:20:50 +01003337 return( ret );
3338 }
3339 }
Gilles Peskineb74a1c72018-04-24 13:09:22 +02003340#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
Gilles Peskine4bf9a282018-01-05 21:20:50 +01003341
3342 if( mbedtls_ssl_own_key( ssl ) == NULL )
3343 {
3344 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key" ) );
3345 return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
3346 }
3347
Gilles Peskine0fd90dd2018-04-26 07:41:09 +02003348 /* Append the signature to ssl->out_msg, leaving 2 bytes for the
3349 * signature length which will be added in ssl_write_server_key_exchange
3350 * after the call to ssl_prepare_server_key_exchange.
3351 * ssl_write_server_key_exchange also takes care of incrementing
3352 * ssl->out_msglen. */
Gilles Peskine1004c192018-01-08 16:59:14 +01003353 if( ( ret = mbedtls_pk_sign( mbedtls_ssl_own_key( ssl ),
3354 md_alg, hash, hashlen,
3355 ssl->out_msg + ssl->out_msglen + 2,
Gilles Peskinef00f1522021-06-22 00:09:00 +02003356 out_buf_len - ssl->out_msglen - 2,
Gilles Peskine7ab013a2018-01-08 17:04:16 +01003357 signature_len,
Gilles Peskine1004c192018-01-08 16:59:14 +01003358 ssl->conf->f_rng,
3359 ssl->conf->p_rng ) ) != 0 )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003360 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003361 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_sign", ret );
Paul Bakkerc70b9822013-04-07 22:00:46 +02003362 return( ret );
Paul Bakker23f36802012-09-28 14:15:14 +00003363 }
Paul Bakker1ef83d62012-04-11 12:09:53 +00003364 }
Gilles Peskineeccd8882020-03-10 12:19:08 +01003365#endif /* MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED */
Paul Bakker1ef83d62012-04-11 12:09:53 +00003366
Gilles Peskine184a3fa2018-01-06 01:46:17 +01003367 return( 0 );
3368}
Paul Bakker1ef83d62012-04-11 12:09:53 +00003369
Gilles Peskined3eb0612018-01-08 17:07:44 +01003370/* Prepare the ServerKeyExchange message and send it. For ciphersuites
Gilles Peskine168dae82018-04-25 23:35:42 +02003371 * that do not include a ServerKeyExchange message, do nothing. Either
3372 * way, if successful, move on to the next step in the SSL state
3373 * machine. */
Gilles Peskine184a3fa2018-01-06 01:46:17 +01003374static int ssl_write_server_key_exchange( mbedtls_ssl_context *ssl )
3375{
Janos Follath865b3eb2019-12-16 11:46:15 +00003376 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
Gilles Peskine7ab013a2018-01-08 17:04:16 +01003377 size_t signature_len = 0;
Gilles Peskineeccd8882020-03-10 12:19:08 +01003378#if defined(MBEDTLS_KEY_EXCHANGE_SOME_NON_PFS_ENABLED)
Gilles Peskine184a3fa2018-01-06 01:46:17 +01003379 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
Hanno Beckere694c3e2017-12-27 21:34:08 +00003380 ssl->handshake->ciphersuite_info;
Gilles Peskineeccd8882020-03-10 12:19:08 +01003381#endif /* MBEDTLS_KEY_EXCHANGE_SOME_NON_PFS_ENABLED */
Gilles Peskine184a3fa2018-01-06 01:46:17 +01003382
Gilles Peskined3eb0612018-01-08 17:07:44 +01003383 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server key exchange" ) );
3384
Gilles Peskineeccd8882020-03-10 12:19:08 +01003385#if defined(MBEDTLS_KEY_EXCHANGE_SOME_NON_PFS_ENABLED)
Gilles Peskined3eb0612018-01-08 17:07:44 +01003386 /* Extract static ECDH parameters and abort if ServerKeyExchange
3387 * is not needed. */
Gilles Peskine184a3fa2018-01-06 01:46:17 +01003388 if( mbedtls_ssl_ciphersuite_no_pfs( ciphersuite_info ) )
3389 {
3390 /* For suites involving ECDH, extract DH parameters
3391 * from certificate at this point. */
Gilles Peskineeccd8882020-03-10 12:19:08 +01003392#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_ENABLED)
Gilles Peskine184a3fa2018-01-06 01:46:17 +01003393 if( mbedtls_ssl_ciphersuite_uses_ecdh( ciphersuite_info ) )
3394 {
3395 ssl_get_ecdh_params_from_cert( ssl );
3396 }
Gilles Peskineeccd8882020-03-10 12:19:08 +01003397#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDH_ENABLED */
Gilles Peskine184a3fa2018-01-06 01:46:17 +01003398
3399 /* Key exchanges not involving ephemeral keys don't use
3400 * ServerKeyExchange, so end here. */
3401 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write server key exchange" ) );
3402 ssl->state++;
3403 return( 0 );
3404 }
Gilles Peskineeccd8882020-03-10 12:19:08 +01003405#endif /* MBEDTLS_KEY_EXCHANGE_SOME_NON_PFS_ENABLED */
Gilles Peskine184a3fa2018-01-06 01:46:17 +01003406
Gilles Peskineeccd8882020-03-10 12:19:08 +01003407#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED) && \
Gilles Peskineb74a1c72018-04-24 13:09:22 +02003408 defined(MBEDTLS_SSL_ASYNC_PRIVATE)
Gilles Peskined3eb0612018-01-08 17:07:44 +01003409 /* If we have already prepared the message and there is an ongoing
Gilles Peskine168dae82018-04-25 23:35:42 +02003410 * signature operation, resume signing. */
Gilles Peskinedf13d5c2018-04-25 20:39:48 +02003411 if( ssl->handshake->async_in_progress != 0 )
Gilles Peskineebd30ae2018-01-06 03:34:20 +01003412 {
3413 MBEDTLS_SSL_DEBUG_MSG( 2, ( "resuming signature operation" ) );
3414 ret = ssl_resume_server_key_exchange( ssl, &signature_len );
Gilles Peskineebd30ae2018-01-06 03:34:20 +01003415 }
3416 else
Gilles Peskineeccd8882020-03-10 12:19:08 +01003417#endif /* defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED) &&
Gilles Peskineb74a1c72018-04-24 13:09:22 +02003418 defined(MBEDTLS_SSL_ASYNC_PRIVATE) */
Gilles Peskineebd30ae2018-01-06 03:34:20 +01003419 {
3420 /* ServerKeyExchange is needed. Prepare the message. */
3421 ret = ssl_prepare_server_key_exchange( ssl, &signature_len );
Gilles Peskined3eb0612018-01-08 17:07:44 +01003422 }
3423
3424 if( ret != 0 )
3425 {
Gilles Peskinead28bf02018-04-26 00:19:16 +02003426 /* If we're starting to write a new message, set ssl->out_msglen
3427 * to 0. But if we're resuming after an asynchronous message,
3428 * out_msglen is the amount of data written so far and mst be
3429 * preserved. */
Gilles Peskined3eb0612018-01-08 17:07:44 +01003430 if( ret == MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS )
3431 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server key exchange (pending)" ) );
3432 else
3433 ssl->out_msglen = 0;
3434 return( ret );
Gilles Peskineebd30ae2018-01-06 03:34:20 +01003435 }
Gilles Peskine184a3fa2018-01-06 01:46:17 +01003436
Gilles Peskine7ab013a2018-01-08 17:04:16 +01003437 /* If there is a signature, write its length.
Gilles Peskine168dae82018-04-25 23:35:42 +02003438 * ssl_prepare_server_key_exchange already wrote the signature
3439 * itself at its proper place in the output buffer. */
Gilles Peskineeccd8882020-03-10 12:19:08 +01003440#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED)
Gilles Peskine7ab013a2018-01-08 17:04:16 +01003441 if( signature_len != 0 )
3442 {
Joe Subbianifbeb6922021-07-16 14:27:50 +01003443 ssl->out_msg[ssl->out_msglen++] = MBEDTLS_BYTE_1( signature_len );
3444 ssl->out_msg[ssl->out_msglen++] = MBEDTLS_BYTE_0( signature_len );
Gilles Peskine7ab013a2018-01-08 17:04:16 +01003445
3446 MBEDTLS_SSL_DEBUG_BUF( 3, "my signature",
3447 ssl->out_msg + ssl->out_msglen,
3448 signature_len );
3449
3450 /* Skip over the already-written signature */
3451 ssl->out_msglen += signature_len;
3452 }
Gilles Peskineeccd8882020-03-10 12:19:08 +01003453#endif /* MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED */
Gilles Peskine7ab013a2018-01-08 17:04:16 +01003454
Gilles Peskine184a3fa2018-01-06 01:46:17 +01003455 /* Add header and send. */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003456 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
3457 ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_KEY_EXCHANGE;
Paul Bakker5121ce52009-01-03 21:22:43 +00003458
3459 ssl->state++;
3460
Manuel Pégourié-Gonnard31c15862017-09-13 09:38:11 +02003461 if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00003462 {
Manuel Pégourié-Gonnard31c15862017-09-13 09:38:11 +02003463 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00003464 return( ret );
3465 }
3466
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003467 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server key exchange" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00003468 return( 0 );
Paul Bakker5121ce52009-01-03 21:22:43 +00003469}
3470
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003471static int ssl_write_server_hello_done( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00003472{
Janos Follath865b3eb2019-12-16 11:46:15 +00003473 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
Paul Bakker5121ce52009-01-03 21:22:43 +00003474
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003475 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server hello done" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00003476
3477 ssl->out_msglen = 4;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003478 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
3479 ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_HELLO_DONE;
Paul Bakker5121ce52009-01-03 21:22:43 +00003480
3481 ssl->state++;
3482
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003483#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003484 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003485 mbedtls_ssl_send_flight_completed( ssl );
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02003486#endif
3487
Manuel Pégourié-Gonnard31c15862017-09-13 09:38:11 +02003488 if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00003489 {
Manuel Pégourié-Gonnard31c15862017-09-13 09:38:11 +02003490 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00003491 return( ret );
3492 }
3493
Manuel Pégourié-Gonnard87a346f2017-09-13 12:45:21 +02003494#if defined(MBEDTLS_SSL_PROTO_DTLS)
3495 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
3496 ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 )
3497 {
3498 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flight_transmit", ret );
3499 return( ret );
3500 }
Hanno Beckerbc2498a2018-08-28 10:13:29 +01003501#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnard87a346f2017-09-13 12:45:21 +02003502
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003503 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello done" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00003504
3505 return( 0 );
3506}
3507
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003508#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \
3509 defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
3510static int ssl_parse_client_dh_public( mbedtls_ssl_context *ssl, unsigned char **p,
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003511 const unsigned char *end )
Paul Bakker70df2fb2013-04-17 17:19:09 +02003512{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003513 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
Paul Bakker70df2fb2013-04-17 17:19:09 +02003514 size_t n;
3515
3516 /*
3517 * Receive G^Y mod P, premaster = (G^Y)^X mod P
3518 */
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003519 if( *p + 2 > end )
3520 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003521 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
Hanno Becker666b5b42021-06-24 10:13:31 +01003522 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003523 }
Paul Bakker70df2fb2013-04-17 17:19:09 +02003524
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003525 n = ( (*p)[0] << 8 ) | (*p)[1];
3526 *p += 2;
3527
Manuel Pégourié-Gonnard969ccc62014-03-26 19:53:25 +01003528 if( *p + n > end )
Paul Bakker70df2fb2013-04-17 17:19:09 +02003529 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003530 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
Hanno Becker666b5b42021-06-24 10:13:31 +01003531 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakker70df2fb2013-04-17 17:19:09 +02003532 }
3533
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003534 if( ( ret = mbedtls_dhm_read_public( &ssl->handshake->dhm_ctx, *p, n ) ) != 0 )
Paul Bakker70df2fb2013-04-17 17:19:09 +02003535 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003536 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_read_public", ret );
Hanno Beckerb24e74b2021-06-24 09:52:01 +01003537 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakker70df2fb2013-04-17 17:19:09 +02003538 }
3539
Manuel Pégourié-Gonnard969ccc62014-03-26 19:53:25 +01003540 *p += n;
3541
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003542 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY );
Paul Bakker70df2fb2013-04-17 17:19:09 +02003543
Paul Bakker70df2fb2013-04-17 17:19:09 +02003544 return( ret );
3545}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003546#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED ||
3547 MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
Paul Bakker70df2fb2013-04-17 17:19:09 +02003548
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003549#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \
3550 defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003551
Gilles Peskineb74a1c72018-04-24 13:09:22 +02003552#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003553static int ssl_resume_decrypt_pms( mbedtls_ssl_context *ssl,
3554 unsigned char *peer_pms,
3555 size_t *peer_pmslen,
3556 size_t peer_pmssize )
3557{
Gilles Peskine8f97af72018-04-26 11:46:10 +02003558 int ret = ssl->conf->f_async_resume( ssl,
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003559 peer_pms, peer_pmslen, peer_pmssize );
3560 if( ret != MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS )
3561 {
Gilles Peskinedf13d5c2018-04-25 20:39:48 +02003562 ssl->handshake->async_in_progress = 0;
Gilles Peskine1febfef2018-04-30 11:54:39 +02003563 mbedtls_ssl_set_async_operation_data( ssl, NULL );
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003564 }
3565 MBEDTLS_SSL_DEBUG_RET( 2, "ssl_decrypt_encrypted_pms", ret );
3566 return( ret );
3567}
Gilles Peskineb74a1c72018-04-24 13:09:22 +02003568#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003569
Gilles Peskinebcd98a52018-01-11 21:30:40 +01003570static int ssl_decrypt_encrypted_pms( mbedtls_ssl_context *ssl,
3571 const unsigned char *p,
3572 const unsigned char *end,
3573 unsigned char *peer_pms,
3574 size_t *peer_pmslen,
3575 size_t peer_pmssize )
Paul Bakker70df2fb2013-04-17 17:19:09 +02003576{
Janos Follath865b3eb2019-12-16 11:46:15 +00003577 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
Gilles Peskine422ccab2018-01-11 18:29:01 +01003578 mbedtls_pk_context *private_key = mbedtls_ssl_own_key( ssl );
3579 mbedtls_pk_context *public_key = &mbedtls_ssl_own_cert( ssl )->pk;
3580 size_t len = mbedtls_pk_get_len( public_key );
Paul Bakker70df2fb2013-04-17 17:19:09 +02003581
Gilles Peskineb74a1c72018-04-24 13:09:22 +02003582#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003583 /* If we have already started decoding the message and there is an ongoing
Gilles Peskine168dae82018-04-25 23:35:42 +02003584 * decryption operation, resume signing. */
Gilles Peskinedf13d5c2018-04-25 20:39:48 +02003585 if( ssl->handshake->async_in_progress != 0 )
Paul Bakker70df2fb2013-04-17 17:19:09 +02003586 {
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003587 MBEDTLS_SSL_DEBUG_MSG( 2, ( "resuming decryption operation" ) );
3588 return( ssl_resume_decrypt_pms( ssl,
3589 peer_pms, peer_pmslen, peer_pmssize ) );
Paul Bakker70df2fb2013-04-17 17:19:09 +02003590 }
Gilles Peskineb74a1c72018-04-24 13:09:22 +02003591#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
Paul Bakker70df2fb2013-04-17 17:19:09 +02003592
3593 /*
Gilles Peskine422ccab2018-01-11 18:29:01 +01003594 * Prepare to decrypt the premaster using own private RSA key
Paul Bakker70df2fb2013-04-17 17:19:09 +02003595 */
Mateusz Starzyk06b07fb2021-02-18 13:55:21 +01003596 if ( p + 2 > end ) {
3597 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
Hanno Becker666b5b42021-06-24 10:13:31 +01003598 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Mateusz Starzyk06b07fb2021-02-18 13:55:21 +01003599 }
Joe Subbiani2194dc42021-07-14 12:31:31 +01003600 if( *p++ != MBEDTLS_BYTE_1( len ) ||
3601 *p++ != MBEDTLS_BYTE_0( len ) )
Paul Bakker70df2fb2013-04-17 17:19:09 +02003602 {
Mateusz Starzyk06b07fb2021-02-18 13:55:21 +01003603 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
Hanno Becker666b5b42021-06-24 10:13:31 +01003604 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakker70df2fb2013-04-17 17:19:09 +02003605 }
3606
Manuel Pégourié-Gonnard0fae60b2013-10-14 17:39:48 +02003607 if( p + len != end )
Paul Bakker70df2fb2013-04-17 17:19:09 +02003608 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003609 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
Hanno Becker666b5b42021-06-24 10:13:31 +01003610 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakker70df2fb2013-04-17 17:19:09 +02003611 }
3612
Gilles Peskine422ccab2018-01-11 18:29:01 +01003613 /*
3614 * Decrypt the premaster secret
3615 */
Gilles Peskineb74a1c72018-04-24 13:09:22 +02003616#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003617 if( ssl->conf->f_async_decrypt_start != NULL )
3618 {
Gilles Peskine8f97af72018-04-26 11:46:10 +02003619 ret = ssl->conf->f_async_decrypt_start( ssl,
Gilles Peskinedf13d5c2018-04-25 20:39:48 +02003620 mbedtls_ssl_own_cert( ssl ),
3621 p, len );
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003622 switch( ret )
3623 {
3624 case MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH:
3625 /* act as if f_async_decrypt_start was null */
3626 break;
3627 case 0:
Gilles Peskinedf13d5c2018-04-25 20:39:48 +02003628 ssl->handshake->async_in_progress = 1;
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003629 return( ssl_resume_decrypt_pms( ssl,
3630 peer_pms,
3631 peer_pmslen,
3632 peer_pmssize ) );
3633 case MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS:
Gilles Peskinedf13d5c2018-04-25 20:39:48 +02003634 ssl->handshake->async_in_progress = 1;
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003635 return( MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS );
3636 default:
Gilles Peskinedf13d5c2018-04-25 20:39:48 +02003637 MBEDTLS_SSL_DEBUG_RET( 1, "f_async_decrypt_start", ret );
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003638 return( ret );
3639 }
3640 }
Gilles Peskineb74a1c72018-04-24 13:09:22 +02003641#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003642
Gilles Peskine422ccab2018-01-11 18:29:01 +01003643 if( ! mbedtls_pk_can_do( private_key, MBEDTLS_PK_RSA ) )
3644 {
Gilles Peskine422ccab2018-01-11 18:29:01 +01003645 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no RSA private key" ) );
3646 return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
3647 }
3648
3649 ret = mbedtls_pk_decrypt( private_key, p, len,
Gilles Peskinebcd98a52018-01-11 21:30:40 +01003650 peer_pms, peer_pmslen, peer_pmssize,
3651 ssl->conf->f_rng, ssl->conf->p_rng );
3652 return( ret );
3653}
3654
3655static int ssl_parse_encrypted_pms( mbedtls_ssl_context *ssl,
3656 const unsigned char *p,
3657 const unsigned char *end,
3658 size_t pms_offset )
3659{
Janos Follath865b3eb2019-12-16 11:46:15 +00003660 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
Gilles Peskinebcd98a52018-01-11 21:30:40 +01003661 unsigned char *pms = ssl->handshake->premaster + pms_offset;
3662 unsigned char ver[2];
3663 unsigned char fake_pms[48], peer_pms[48];
3664 unsigned char mask;
3665 size_t i, peer_pmslen;
3666 unsigned int diff;
3667
Gilles Peskine0a8352b2018-06-13 18:16:41 +02003668 /* In case of a failure in decryption, the decryption may write less than
3669 * 2 bytes of output, but we always read the first two bytes. It doesn't
3670 * matter in the end because diff will be nonzero in that case due to
André Maroneze79533292020-11-12 09:37:42 +01003671 * ret being nonzero, and we only care whether diff is 0.
3672 * But do initialize peer_pms and peer_pmslen for robustness anyway. This
3673 * also makes memory analyzers happy (don't access uninitialized memory,
3674 * even if it's an unsigned char). */
Gilles Peskine0a8352b2018-06-13 18:16:41 +02003675 peer_pms[0] = peer_pms[1] = ~0;
André Maroneze79533292020-11-12 09:37:42 +01003676 peer_pmslen = 0;
Gilles Peskine0a8352b2018-06-13 18:16:41 +02003677
Gilles Peskinebcd98a52018-01-11 21:30:40 +01003678 ret = ssl_decrypt_encrypted_pms( ssl, p, end,
3679 peer_pms,
3680 &peer_pmslen,
3681 sizeof( peer_pms ) );
3682
Gilles Peskineb74a1c72018-04-24 13:09:22 +02003683#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003684 if ( ret == MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS )
3685 return( ret );
Gilles Peskineb74a1c72018-04-24 13:09:22 +02003686#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003687
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003688 mbedtls_ssl_write_version( ssl->handshake->max_major_ver,
Gilles Peskine2e333372018-04-24 13:22:10 +02003689 ssl->handshake->max_minor_ver,
3690 ssl->conf->transport, ver );
3691
3692 /* Avoid data-dependent branches while checking for invalid
3693 * padding, to protect against timing-based Bleichenbacher-type
3694 * attacks. */
3695 diff = (unsigned int) ret;
3696 diff |= peer_pmslen ^ 48;
3697 diff |= peer_pms[0] ^ ver[0];
3698 diff |= peer_pms[1] ^ ver[1];
3699
3700 /* mask = diff ? 0xff : 0x00 using bit operations to avoid branches */
Gabor Mezei90437e32021-10-20 11:59:27 +02003701 mask = mbedtls_ct_uint_mask( diff );
Manuel Pégourié-Gonnardb9c93d02015-06-23 13:53:15 +02003702
Manuel Pégourié-Gonnard6674cce2015-02-06 10:30:58 +00003703 /*
3704 * Protection against Bleichenbacher's attack: invalid PKCS#1 v1.5 padding
3705 * must not cause the connection to end immediately; instead, send a
3706 * bad_record_mac later in the handshake.
Gilles Peskinebcd98a52018-01-11 21:30:40 +01003707 * To protect against timing-based variants of the attack, we must
3708 * not have any branch that depends on whether the decryption was
3709 * successful. In particular, always generate the fake premaster secret,
3710 * regardless of whether it will ultimately influence the output or not.
Manuel Pégourié-Gonnard6674cce2015-02-06 10:30:58 +00003711 */
Manuel Pégourié-Gonnard750e4d72015-05-07 12:35:38 +01003712 ret = ssl->conf->f_rng( ssl->conf->p_rng, fake_pms, sizeof( fake_pms ) );
Manuel Pégourié-Gonnard6674cce2015-02-06 10:30:58 +00003713 if( ret != 0 )
Gilles Peskinebcd98a52018-01-11 21:30:40 +01003714 {
Gilles Peskinee1416382018-04-26 10:23:21 +02003715 /* It's ok to abort on an RNG failure, since this does not reveal
3716 * anything about the RSA decryption. */
Manuel Pégourié-Gonnard6674cce2015-02-06 10:30:58 +00003717 return( ret );
Gilles Peskinebcd98a52018-01-11 21:30:40 +01003718 }
Manuel Pégourié-Gonnard6674cce2015-02-06 10:30:58 +00003719
Manuel Pégourié-Gonnard331ba572015-04-20 12:33:57 +01003720#if defined(MBEDTLS_SSL_DEBUG_ALL)
Manuel Pégourié-Gonnardce60fbe2015-04-15 16:45:52 +02003721 if( diff != 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003722 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
Manuel Pégourié-Gonnard6674cce2015-02-06 10:30:58 +00003723#endif
Paul Bakker70df2fb2013-04-17 17:19:09 +02003724
Manuel Pégourié-Gonnard6674cce2015-02-06 10:30:58 +00003725 if( sizeof( ssl->handshake->premaster ) < pms_offset ||
3726 sizeof( ssl->handshake->premaster ) - pms_offset < 48 )
3727 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003728 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
3729 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakker70df2fb2013-04-17 17:19:09 +02003730 }
Manuel Pégourié-Gonnard6674cce2015-02-06 10:30:58 +00003731 ssl->handshake->pmslen = 48;
Paul Bakker70df2fb2013-04-17 17:19:09 +02003732
Gilles Peskine422ccab2018-01-11 18:29:01 +01003733 /* Set pms to either the true or the fake PMS, without
3734 * data-dependent branches. */
Manuel Pégourié-Gonnard6674cce2015-02-06 10:30:58 +00003735 for( i = 0; i < ssl->handshake->pmslen; i++ )
3736 pms[i] = ( mask & fake_pms[i] ) | ( (~mask) & peer_pms[i] );
3737
3738 return( 0 );
Paul Bakker70df2fb2013-04-17 17:19:09 +02003739}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003740#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED ||
3741 MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
Paul Bakker70df2fb2013-04-17 17:19:09 +02003742
Gilles Peskineeccd8882020-03-10 12:19:08 +01003743#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003744static int ssl_parse_client_psk_identity( mbedtls_ssl_context *ssl, unsigned char **p,
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003745 const unsigned char *end )
Paul Bakkerfbb17802013-04-17 19:10:21 +02003746{
Paul Bakker6db455e2013-09-18 17:29:31 +02003747 int ret = 0;
irwir6527bd62019-09-21 18:51:25 +03003748 uint16_t n;
Paul Bakkerfbb17802013-04-17 19:10:21 +02003749
Hanno Becker845b9462018-10-26 12:07:29 +01003750 if( ssl_conf_has_psk_or_cb( ssl->conf ) == 0 )
Paul Bakkerfbb17802013-04-17 19:10:21 +02003751 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003752 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no pre-shared key" ) );
3753 return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
Paul Bakkerfbb17802013-04-17 19:10:21 +02003754 }
3755
3756 /*
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003757 * Receive client pre-shared key identity name
Paul Bakkerfbb17802013-04-17 19:10:21 +02003758 */
Hanno Becker83c9f492017-06-26 13:52:14 +01003759 if( end - *p < 2 )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003760 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003761 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
Hanno Becker666b5b42021-06-24 10:13:31 +01003762 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003763 }
Paul Bakkerfbb17802013-04-17 19:10:21 +02003764
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003765 n = ( (*p)[0] << 8 ) | (*p)[1];
3766 *p += 2;
3767
irwir6527bd62019-09-21 18:51:25 +03003768 if( n == 0 || n > end - *p )
Paul Bakkerfbb17802013-04-17 19:10:21 +02003769 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003770 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
Hanno Becker666b5b42021-06-24 10:13:31 +01003771 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakkerfbb17802013-04-17 19:10:21 +02003772 }
3773
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003774 if( ssl->conf->f_psk != NULL )
Paul Bakker6db455e2013-09-18 17:29:31 +02003775 {
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003776 if( ssl->conf->f_psk( ssl->conf->p_psk, ssl, *p, n ) != 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003777 ret = MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY;
Paul Bakker6db455e2013-09-18 17:29:31 +02003778 }
Manuel Pégourié-Gonnardd27680b2014-07-08 14:15:55 +02003779 else
Paul Bakker6db455e2013-09-18 17:29:31 +02003780 {
Manuel Pégourié-Gonnard31ff1d22013-10-28 13:46:11 +01003781 /* Identity is not a big secret since clients send it in the clear,
3782 * but treat it carefully anyway, just in case */
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003783 if( n != ssl->conf->psk_identity_len ||
Gabor Mezei90437e32021-10-20 11:59:27 +02003784 mbedtls_ct_memcmp( ssl->conf->psk_identity, *p, n ) != 0 )
Paul Bakker6db455e2013-09-18 17:29:31 +02003785 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003786 ret = MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY;
Paul Bakker6db455e2013-09-18 17:29:31 +02003787 }
3788 }
3789
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003790 if( ret == MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY )
Paul Bakkerfbb17802013-04-17 19:10:21 +02003791 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003792 MBEDTLS_SSL_DEBUG_BUF( 3, "Unknown PSK identity", *p, n );
Gilles Peskinec94f7352017-05-10 16:37:56 +02003793 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
3794 MBEDTLS_SSL_ALERT_MSG_UNKNOWN_PSK_IDENTITY );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003795 return( MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY );
Paul Bakkerfbb17802013-04-17 19:10:21 +02003796 }
3797
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003798 *p += n;
Paul Bakkerfbb17802013-04-17 19:10:21 +02003799
Manuel Pégourié-Gonnardd27680b2014-07-08 14:15:55 +02003800 return( 0 );
Paul Bakkerfbb17802013-04-17 19:10:21 +02003801}
Gilles Peskineeccd8882020-03-10 12:19:08 +01003802#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
Paul Bakkerfbb17802013-04-17 19:10:21 +02003803
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003804static int ssl_parse_client_key_exchange( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00003805{
Janos Follath865b3eb2019-12-16 11:46:15 +00003806 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003807 const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
Manuel Pégourié-Gonnard2114d722014-09-10 13:59:41 +00003808 unsigned char *p, *end;
Paul Bakker70df2fb2013-04-17 17:19:09 +02003809
Hanno Beckere694c3e2017-12-27 21:34:08 +00003810 ciphersuite_info = ssl->handshake->ciphersuite_info;
Paul Bakker5121ce52009-01-03 21:22:43 +00003811
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003812 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client key exchange" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00003813
Gilles Peskineb74a1c72018-04-24 13:09:22 +02003814#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) && \
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003815 ( defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \
3816 defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) )
3817 if( ( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ||
3818 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA ) &&
Gilles Peskinedf13d5c2018-04-25 20:39:48 +02003819 ( ssl->handshake->async_in_progress != 0 ) )
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003820 {
3821 /* We've already read a record and there is an asynchronous
3822 * operation in progress to decrypt it. So skip reading the
Gilles Peskine168dae82018-04-25 23:35:42 +02003823 * record. */
Gilles Peskine2c6078e2018-01-12 13:46:43 +01003824 MBEDTLS_SSL_DEBUG_MSG( 3, ( "will resume decryption of previously-read record" ) );
3825 }
3826 else
3827#endif
Hanno Becker327c93b2018-08-15 13:56:18 +01003828 if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00003829 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003830 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00003831 return( ret );
3832 }
3833
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003834 p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
Manuel Pégourié-Gonnard2114d722014-09-10 13:59:41 +00003835 end = ssl->in_msg + ssl->in_hslen;
Manuel Pégourié-Gonnardf8995832014-09-10 08:25:12 +00003836
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003837 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
Paul Bakker5121ce52009-01-03 21:22:43 +00003838 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003839 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
Hanno Becker666b5b42021-06-24 10:13:31 +01003840 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Paul Bakker5121ce52009-01-03 21:22:43 +00003841 }
3842
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003843 if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_KEY_EXCHANGE )
Paul Bakker5121ce52009-01-03 21:22:43 +00003844 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003845 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
Hanno Becker666b5b42021-06-24 10:13:31 +01003846 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Paul Bakker5121ce52009-01-03 21:22:43 +00003847 }
3848
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003849#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED)
3850 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA )
Paul Bakker5121ce52009-01-03 21:22:43 +00003851 {
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003852 if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00003853 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003854 MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret );
Paul Bakker70df2fb2013-04-17 17:19:09 +02003855 return( ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00003856 }
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003857
Manuel Pégourié-Gonnard969ccc62014-03-26 19:53:25 +01003858 if( p != end )
3859 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003860 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) );
Hanno Becker666b5b42021-06-24 10:13:31 +01003861 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Manuel Pégourié-Gonnard969ccc62014-03-26 19:53:25 +01003862 }
3863
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003864 if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003865 ssl->handshake->premaster,
Manuel Pégourié-Gonnard33352052015-06-02 16:17:08 +01003866 MBEDTLS_PREMASTER_SIZE,
Manuel Pégourié-Gonnard2d627642013-09-04 14:22:07 +02003867 &ssl->handshake->pmslen,
Manuel Pégourié-Gonnard750e4d72015-05-07 12:35:38 +01003868 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003869 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003870 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
Hanno Beckerd3eec782021-06-24 10:21:46 +01003871 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003872 }
3873
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003874 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
Paul Bakker70df2fb2013-04-17 17:19:09 +02003875 }
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003876 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003877#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED */
Przemek Stekielce1d7922022-03-14 16:16:25 +01003878#if defined(MBEDTLS_USE_PSA_CRYPTO) && \
3879 ( defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
3880 defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) )
3881 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA ||
3882 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
3883 {
3884 size_t data_len = (size_t)( *p++ );
3885 size_t buf_len = (size_t)( end - p );
3886 psa_status_t status = PSA_ERROR_GENERIC_ERROR;
3887 mbedtls_ssl_handshake_params *handshake = ssl->handshake;
3888
3889 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Read the peer's public key." ) );
3890
3891 /*
Przemek Stekiel338b61d2022-03-15 08:03:43 +01003892 * We must have at least two bytes (1 for length, at least 1 for data)
3893 */
Przemek Stekielce1d7922022-03-14 16:16:25 +01003894 if( buf_len < 2 )
3895 {
3896 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Invalid buffer length" ) );
3897 return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
3898 }
3899
3900 if( data_len < 1 || data_len > buf_len )
3901 {
3902 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Invalid data length" ) );
3903 return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
3904 }
3905
3906 /* Store peer's ECDH public key. */
3907 memcpy( handshake->ecdh_psa_peerkey, p, data_len );
3908 handshake->ecdh_psa_peerkey_len = data_len;
3909
3910 /* Compute ECDH shared secret. */
3911 status = psa_raw_key_agreement(
3912 PSA_ALG_ECDH, handshake->ecdh_psa_privkey,
3913 handshake->ecdh_psa_peerkey, handshake->ecdh_psa_peerkey_len,
3914 handshake->premaster, sizeof( handshake->premaster ),
3915 &handshake->pmslen );
3916 if( status != PSA_SUCCESS )
3917 {
3918 ret = psa_ssl_status_to_mbedtls( status );
3919 MBEDTLS_SSL_DEBUG_RET( 1, "psa_raw_key_agreement", ret );
3920 (void) psa_destroy_key( handshake->ecdh_psa_privkey );
3921 handshake->ecdh_psa_privkey = MBEDTLS_SVC_KEY_ID_INIT;
3922 return( ret );
3923 }
3924
3925 status = psa_destroy_key( handshake->ecdh_psa_privkey );
3926
3927 if( status != PSA_SUCCESS )
3928 {
3929 ret = psa_ssl_status_to_mbedtls( status );
3930 MBEDTLS_SSL_DEBUG_RET( 1, "psa_destroy_key", ret );
3931 return( ret );
3932 }
3933 handshake->ecdh_psa_privkey = MBEDTLS_SVC_KEY_ID_INIT;
3934 }
3935 else
Przemek Stekielce1d7922022-03-14 16:16:25 +01003936#endif /* MBEDTLS_USE_PSA_CRYPTO &&
3937 ( MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
3938 MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ) */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003939#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
3940 defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \
3941 defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
3942 defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
3943 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA ||
3944 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA ||
3945 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA ||
3946 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA )
Paul Bakker70df2fb2013-04-17 17:19:09 +02003947 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003948 if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx,
Manuel Pégourié-Gonnard2114d722014-09-10 13:59:41 +00003949 p, end - p) ) != 0 )
Manuel Pégourié-Gonnardb59d6992013-10-14 12:00:45 +02003950 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003951 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret );
Hanno Beckerb24e74b2021-06-24 09:52:01 +01003952 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Manuel Pégourié-Gonnardb59d6992013-10-14 12:00:45 +02003953 }
3954
Andrzej Kurekc470b6b2019-01-31 08:20:20 -05003955 MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx,
3956 MBEDTLS_DEBUG_ECDH_QP );
Manuel Pégourié-Gonnardb59d6992013-10-14 12:00:45 +02003957
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003958 if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx,
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003959 &ssl->handshake->pmslen,
3960 ssl->handshake->premaster,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003961 MBEDTLS_MPI_MAX_SIZE,
Manuel Pégourié-Gonnard750e4d72015-05-07 12:35:38 +01003962 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003963 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003964 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
Hanno Beckerd3eec782021-06-24 10:21:46 +01003965 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003966 }
3967
Andrzej Kurekc470b6b2019-01-31 08:20:20 -05003968 MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx,
3969 MBEDTLS_DEBUG_ECDH_Z );
Paul Bakker5121ce52009-01-03 21:22:43 +00003970 }
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003971 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003972#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
3973 MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ||
3974 MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED ||
3975 MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
3976#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
3977 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK )
Paul Bakkerfbb17802013-04-17 19:10:21 +02003978 {
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003979 if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
Paul Bakkerfbb17802013-04-17 19:10:21 +02003980 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003981 MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
Paul Bakkerfbb17802013-04-17 19:10:21 +02003982 return( ret );
3983 }
Paul Bakker48f7a5d2013-04-19 14:30:58 +02003984
Manuel Pégourié-Gonnard969ccc62014-03-26 19:53:25 +01003985 if( p != end )
3986 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003987 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) );
Hanno Becker666b5b42021-06-24 10:13:31 +01003988 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Manuel Pégourié-Gonnard969ccc62014-03-26 19:53:25 +01003989 }
3990
Hanno Becker845b9462018-10-26 12:07:29 +01003991#if defined(MBEDTLS_USE_PSA_CRYPTO)
3992 /* For opaque PSKs, we perform the PSK-to-MS derivation atomatically
3993 * and skip the intermediate PMS. */
Hanno Beckerc1385c12018-11-05 12:44:27 +00003994 if( ssl_use_opaque_psk( ssl ) == 1 )
Hanno Becker845b9462018-10-26 12:07:29 +01003995 MBEDTLS_SSL_DEBUG_MSG( 1, ( "skip PMS generation for opaque PSK" ) );
3996 else
3997#endif /* MBEDTLS_USE_PSA_CRYPTO */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003998 if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02003999 ciphersuite_info->key_exchange ) ) != 0 )
4000 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004001 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02004002 return( ret );
4003 }
Paul Bakkerfbb17802013-04-17 19:10:21 +02004004 }
Paul Bakker5121ce52009-01-03 21:22:43 +00004005 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004006#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */
4007#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
4008 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
Manuel Pégourié-Gonnard0fae60b2013-10-14 17:39:48 +02004009 {
Gilles Peskineb74a1c72018-04-24 13:09:22 +02004010#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
Gilles Peskinedf13d5c2018-04-25 20:39:48 +02004011 if ( ssl->handshake->async_in_progress != 0 )
Gilles Peskine2c6078e2018-01-12 13:46:43 +01004012 {
4013 /* There is an asynchronous operation in progress to
4014 * decrypt the encrypted premaster secret, so skip
4015 * directly to resuming this operation. */
4016 MBEDTLS_SSL_DEBUG_MSG( 3, ( "PSK identity already parsed" ) );
4017 /* Update p to skip the PSK identity. ssl_parse_encrypted_pms
4018 * won't actually use it, but maintain p anyway for robustness. */
4019 p += ssl->conf->psk_identity_len + 2;
4020 }
4021 else
Gilles Peskineb74a1c72018-04-24 13:09:22 +02004022#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
Manuel Pégourié-Gonnard0fae60b2013-10-14 17:39:48 +02004023 if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
4024 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004025 MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
Manuel Pégourié-Gonnard0fae60b2013-10-14 17:39:48 +02004026 return( ret );
4027 }
4028
Hanno Becker845b9462018-10-26 12:07:29 +01004029#if defined(MBEDTLS_USE_PSA_CRYPTO)
4030 /* Opaque PSKs are currently only supported for PSK-only. */
4031 if( ssl_use_opaque_psk( ssl ) == 1 )
4032 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
4033#endif
4034
Manuel Pégourié-Gonnard0fae60b2013-10-14 17:39:48 +02004035 if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 2 ) ) != 0 )
4036 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004037 MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_encrypted_pms" ), ret );
Manuel Pégourié-Gonnard0fae60b2013-10-14 17:39:48 +02004038 return( ret );
4039 }
4040
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004041 if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
Manuel Pégourié-Gonnard0fae60b2013-10-14 17:39:48 +02004042 ciphersuite_info->key_exchange ) ) != 0 )
4043 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004044 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
Manuel Pégourié-Gonnard0fae60b2013-10-14 17:39:48 +02004045 return( ret );
4046 }
4047 }
4048 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004049#endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
4050#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
4051 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004052 {
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004053 if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
4054 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004055 MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004056 return( ret );
4057 }
4058 if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 )
4059 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004060 MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004061 return( ret );
4062 }
4063
Hanno Becker845b9462018-10-26 12:07:29 +01004064#if defined(MBEDTLS_USE_PSA_CRYPTO)
4065 /* Opaque PSKs are currently only supported for PSK-only. */
4066 if( ssl_use_opaque_psk( ssl ) == 1 )
4067 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
4068#endif
4069
Manuel Pégourié-Gonnard969ccc62014-03-26 19:53:25 +01004070 if( p != end )
4071 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004072 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) );
Hanno Becker666b5b42021-06-24 10:13:31 +01004073 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Manuel Pégourié-Gonnard969ccc62014-03-26 19:53:25 +01004074 }
4075
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004076 if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02004077 ciphersuite_info->key_exchange ) ) != 0 )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004078 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004079 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02004080 return( ret );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004081 }
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004082 }
4083 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004084#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
4085#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
4086 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
Manuel Pégourié-Gonnard3ce3bbd2013-10-11 16:53:50 +02004087 {
Manuel Pégourié-Gonnard3ce3bbd2013-10-11 16:53:50 +02004088 if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
4089 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004090 MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
Manuel Pégourié-Gonnard3ce3bbd2013-10-11 16:53:50 +02004091 return( ret );
4092 }
Manuel Pégourié-Gonnardb59d6992013-10-14 12:00:45 +02004093
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004094 if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx,
Manuel Pégourié-Gonnardb59d6992013-10-14 12:00:45 +02004095 p, end - p ) ) != 0 )
Manuel Pégourié-Gonnard3ce3bbd2013-10-11 16:53:50 +02004096 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004097 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret );
Hanno Beckerb24e74b2021-06-24 09:52:01 +01004098 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Manuel Pégourié-Gonnard3ce3bbd2013-10-11 16:53:50 +02004099 }
4100
Hanno Becker845b9462018-10-26 12:07:29 +01004101#if defined(MBEDTLS_USE_PSA_CRYPTO)
4102 /* Opaque PSKs are currently only supported for PSK-only. */
4103 if( ssl_use_opaque_psk( ssl ) == 1 )
4104 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
4105#endif
4106
Andrzej Kurekc470b6b2019-01-31 08:20:20 -05004107 MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx,
4108 MBEDTLS_DEBUG_ECDH_QP );
Manuel Pégourié-Gonnardb59d6992013-10-14 12:00:45 +02004109
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004110 if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02004111 ciphersuite_info->key_exchange ) ) != 0 )
Manuel Pégourié-Gonnard3ce3bbd2013-10-11 16:53:50 +02004112 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004113 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
Manuel Pégourié-Gonnard3ce3bbd2013-10-11 16:53:50 +02004114 return( ret );
4115 }
Manuel Pégourié-Gonnard3ce3bbd2013-10-11 16:53:50 +02004116 }
4117 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004118#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
4119#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED)
4120 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA )
Paul Bakker41c83d32013-03-20 14:39:14 +01004121 {
Manuel Pégourié-Gonnard2114d722014-09-10 13:59:41 +00004122 if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 0 ) ) != 0 )
Paul Bakker41c83d32013-03-20 14:39:14 +01004123 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004124 MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_parse_encrypted_pms_secret" ), ret );
Paul Bakker70df2fb2013-04-17 17:19:09 +02004125 return( ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00004126 }
4127 }
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004128 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004129#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */
Manuel Pégourié-Gonnard0f1660a2015-09-16 22:41:06 +02004130#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
4131 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
4132 {
4133 ret = mbedtls_ecjpake_read_round_two( &ssl->handshake->ecjpake_ctx,
4134 p, end - p );
4135 if( ret != 0 )
4136 {
4137 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_two", ret );
Hanno Beckercbc8f6f2021-06-24 10:32:31 +01004138 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard0f1660a2015-09-16 22:41:06 +02004139 }
4140
4141 ret = mbedtls_ecjpake_derive_secret( &ssl->handshake->ecjpake_ctx,
4142 ssl->handshake->premaster, 32, &ssl->handshake->pmslen,
4143 ssl->conf->f_rng, ssl->conf->p_rng );
4144 if( ret != 0 )
4145 {
4146 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_derive_secret", ret );
4147 return( ret );
4148 }
4149 }
4150 else
4151#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004152 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004153 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
4154 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004155 }
Paul Bakker5121ce52009-01-03 21:22:43 +00004156
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004157 if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
Paul Bakkerff60ee62010-03-16 21:09:09 +00004158 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004159 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
Paul Bakkerff60ee62010-03-16 21:09:09 +00004160 return( ret );
4161 }
Paul Bakker5121ce52009-01-03 21:22:43 +00004162
Paul Bakker5121ce52009-01-03 21:22:43 +00004163 ssl->state++;
4164
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004165 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client key exchange" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004166
4167 return( 0 );
4168}
4169
Gilles Peskineeccd8882020-03-10 12:19:08 +01004170#if !defined(MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004171static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00004172{
Hanno Becker0d0cd4b2017-05-11 14:06:43 +01004173 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
Hanno Beckere694c3e2017-12-27 21:34:08 +00004174 ssl->handshake->ciphersuite_info;
Paul Bakker5121ce52009-01-03 21:22:43 +00004175
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004176 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004177
Hanno Becker77adddc2019-02-07 12:32:43 +00004178 if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) )
Paul Bakkered27a042013-04-18 22:46:23 +02004179 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004180 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
Paul Bakkered27a042013-04-18 22:46:23 +02004181 ssl->state++;
4182 return( 0 );
4183 }
4184
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004185 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
4186 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004187}
Gilles Peskineeccd8882020-03-10 12:19:08 +01004188#else /* !MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004189static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004190{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004191 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
Manuel Pégourié-Gonnard4528f3f2014-09-10 14:17:23 +00004192 size_t i, sig_len;
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004193 unsigned char hash[48];
Manuel Pégourié-Gonnard4bd12842013-08-27 13:31:28 +02004194 unsigned char *hash_start = hash;
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02004195 size_t hashlen;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004196 mbedtls_pk_type_t pk_alg;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004197 mbedtls_md_type_t md_alg;
Hanno Becker0d0cd4b2017-05-11 14:06:43 +01004198 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
Hanno Beckere694c3e2017-12-27 21:34:08 +00004199 ssl->handshake->ciphersuite_info;
Hanno Beckera1ab9be2019-02-06 18:31:04 +00004200 mbedtls_pk_context * peer_pk;
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004201
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004202 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004203
Hanno Becker2a831a42019-02-07 13:17:25 +00004204 if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004205 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004206 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004207 ssl->state++;
4208 return( 0 );
4209 }
4210
Hanno Becker2a831a42019-02-07 13:17:25 +00004211#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
4212 if( ssl->session_negotiate->peer_cert == NULL )
4213 {
4214 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
4215 ssl->state++;
4216 return( 0 );
4217 }
4218#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
4219 if( ssl->session_negotiate->peer_cert_digest == NULL )
4220 {
4221 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
4222 ssl->state++;
4223 return( 0 );
4224 }
4225#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
4226
Simon Butcher99000142016-10-13 17:21:01 +01004227 /* Read the message without adding it to the checksum */
Hanno Becker327c93b2018-08-15 13:56:18 +01004228 ret = mbedtls_ssl_read_record( ssl, 0 /* no checksum update */ );
Simon Butcher99000142016-10-13 17:21:01 +01004229 if( 0 != ret )
Paul Bakker5121ce52009-01-03 21:22:43 +00004230 {
Hanno Becker327c93b2018-08-15 13:56:18 +01004231 MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_read_record" ), ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00004232 return( ret );
4233 }
4234
4235 ssl->state++;
4236
Simon Butcher99000142016-10-13 17:21:01 +01004237 /* Process the message contents */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004238 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ||
4239 ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE_VERIFY )
Paul Bakker5121ce52009-01-03 21:22:43 +00004240 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004241 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
Hanno Beckerd934a2a2021-06-24 10:23:45 +01004242 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004243 }
4244
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004245 i = mbedtls_ssl_hs_hdr_len( ssl );
Paul Bakker5121ce52009-01-03 21:22:43 +00004246
Hanno Beckera1ab9be2019-02-06 18:31:04 +00004247#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
4248 peer_pk = &ssl->handshake->peer_pubkey;
4249#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
4250 if( ssl->session_negotiate->peer_cert == NULL )
4251 {
4252 /* Should never happen */
4253 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
4254 }
4255 peer_pk = &ssl->session_negotiate->peer_cert->pk;
4256#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
4257
Manuel Pégourié-Gonnard4528f3f2014-09-10 14:17:23 +00004258 /*
4259 * struct {
4260 * SignatureAndHashAlgorithm algorithm; -- TLS 1.2 only
4261 * opaque signature<0..2^16-1>;
4262 * } DigitallySigned;
4263 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004264 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
Manuel Pégourié-Gonnardb3d91872013-08-14 15:56:19 +02004265 {
Manuel Pégourié-Gonnard5ee96542014-09-10 14:27:21 +00004266 if( i + 2 > ssl->in_hslen )
4267 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004268 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
Hanno Beckerd934a2a2021-06-24 10:23:45 +01004269 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Manuel Pégourié-Gonnard5ee96542014-09-10 14:27:21 +00004270 }
4271
Paul Bakker5121ce52009-01-03 21:22:43 +00004272 /*
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02004273 * Hash
Paul Bakker5121ce52009-01-03 21:22:43 +00004274 */
Simon Butcher99000142016-10-13 17:21:01 +01004275 md_alg = mbedtls_ssl_md_alg_from_hash( ssl->in_msg[i] );
4276
4277 if( md_alg == MBEDTLS_MD_NONE || mbedtls_ssl_set_calc_verify_md( ssl, ssl->in_msg[i] ) )
Paul Bakker5121ce52009-01-03 21:22:43 +00004278 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004279 MBEDTLS_SSL_DEBUG_MSG( 1, ( "peer not adhering to requested sig_alg"
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02004280 " for verify message" ) );
Hanno Beckerd934a2a2021-06-24 10:23:45 +01004281 return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
Paul Bakker5121ce52009-01-03 21:22:43 +00004282 }
4283
Simon Butcher99000142016-10-13 17:21:01 +01004284#if !defined(MBEDTLS_MD_SHA1)
4285 if( MBEDTLS_MD_SHA1 == md_alg )
4286 hash_start += 16;
4287#endif
Paul Bakker926af752012-11-23 13:38:07 +01004288
Manuel Pégourié-Gonnardbfe32ef2013-08-22 14:55:30 +02004289 /* Info from md_alg will be used instead */
4290 hashlen = 0;
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02004291
Manuel Pégourié-Gonnard4528f3f2014-09-10 14:17:23 +00004292 i++;
4293
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02004294 /*
4295 * Signature
4296 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004297 if( ( pk_alg = mbedtls_ssl_pk_alg_from_sig( ssl->in_msg[i] ) )
4298 == MBEDTLS_PK_NONE )
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02004299 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004300 MBEDTLS_SSL_DEBUG_MSG( 1, ( "peer not adhering to requested sig_alg"
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02004301 " for verify message" ) );
Hanno Beckerd934a2a2021-06-24 10:23:45 +01004302 return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02004303 }
4304
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02004305 /*
4306 * Check the certificate's key type matches the signature alg
4307 */
Hanno Beckera1ab9be2019-02-06 18:31:04 +00004308 if( !mbedtls_pk_can_do( peer_pk, pk_alg ) )
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02004309 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004310 MBEDTLS_SSL_DEBUG_MSG( 1, ( "sig_alg doesn't match cert key" ) );
Hanno Beckerd934a2a2021-06-24 10:23:45 +01004311 return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
Manuel Pégourié-Gonnard0b032002013-08-17 13:01:41 +02004312 }
Manuel Pégourié-Gonnard4528f3f2014-09-10 14:17:23 +00004313
4314 i++;
Paul Bakker577e0062013-08-28 11:57:20 +02004315 }
4316 else
Paul Bakker577e0062013-08-28 11:57:20 +02004317 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004318 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
4319 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardb3d91872013-08-14 15:56:19 +02004320 }
Manuel Pégourié-Gonnardff56da32013-07-11 10:46:21 +02004321
Manuel Pégourié-Gonnard5ee96542014-09-10 14:27:21 +00004322 if( i + 2 > ssl->in_hslen )
4323 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004324 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
Hanno Beckerd934a2a2021-06-24 10:23:45 +01004325 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Manuel Pégourié-Gonnard5ee96542014-09-10 14:27:21 +00004326 }
4327
Manuel Pégourié-Gonnard4528f3f2014-09-10 14:17:23 +00004328 sig_len = ( ssl->in_msg[i] << 8 ) | ssl->in_msg[i+1];
4329 i += 2;
Paul Bakker926af752012-11-23 13:38:07 +01004330
Manuel Pégourié-Gonnard4528f3f2014-09-10 14:17:23 +00004331 if( i + sig_len != ssl->in_hslen )
Paul Bakker5121ce52009-01-03 21:22:43 +00004332 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004333 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
Hanno Beckerd934a2a2021-06-24 10:23:45 +01004334 return( MBEDTLS_ERR_SSL_DECODE_ERROR );
Paul Bakker5121ce52009-01-03 21:22:43 +00004335 }
4336
Simon Butcher99000142016-10-13 17:21:01 +01004337 /* Calculate hash and verify signature */
Manuel Pégourié-Gonnardde718b92019-05-03 11:43:28 +02004338 {
4339 size_t dummy_hlen;
4340 ssl->handshake->calc_verify( ssl, hash, &dummy_hlen );
4341 }
Simon Butcher99000142016-10-13 17:21:01 +01004342
Hanno Beckera1ab9be2019-02-06 18:31:04 +00004343 if( ( ret = mbedtls_pk_verify( peer_pk,
Manuel Pégourié-Gonnard4bd12842013-08-27 13:31:28 +02004344 md_alg, hash_start, hashlen,
Manuel Pégourié-Gonnard4528f3f2014-09-10 14:17:23 +00004345 ssl->in_msg + i, sig_len ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004346 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004347 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00004348 return( ret );
4349 }
4350
Simon Butcher99000142016-10-13 17:21:01 +01004351 mbedtls_ssl_update_handshake_status( ssl );
4352
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004353 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate verify" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004354
Paul Bakkered27a042013-04-18 22:46:23 +02004355 return( ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00004356}
Gilles Peskineeccd8882020-03-10 12:19:08 +01004357#endif /* MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED */
Paul Bakker5121ce52009-01-03 21:22:43 +00004358
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004359#if defined(MBEDTLS_SSL_SESSION_TICKETS)
4360static int ssl_write_new_session_ticket( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02004361{
Janos Follath865b3eb2019-12-16 11:46:15 +00004362 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
Manuel Pégourié-Gonnard609bc812013-08-01 15:08:40 +02004363 size_t tlen;
Manuel Pégourié-Gonnardb0394be2015-05-19 11:40:30 +02004364 uint32_t lifetime;
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02004365
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004366 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write new session ticket" ) );
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02004367
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004368 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
4369 ssl->out_msg[0] = MBEDTLS_SSL_HS_NEW_SESSION_TICKET;
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02004370
4371 /*
4372 * struct {
4373 * uint32 ticket_lifetime_hint;
4374 * opaque ticket<0..2^16-1>;
4375 * } NewSessionTicket;
4376 *
4377 * 4 . 7 ticket_lifetime_hint (0 = unspecified)
4378 * 8 . 9 ticket_len (n)
4379 * 10 . 9+n ticket content
4380 */
Manuel Pégourié-Gonnard164d8942013-09-23 22:01:39 +02004381
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +02004382 if( ( ret = ssl->conf->f_ticket_write( ssl->conf->p_ticket,
Manuel Pégourié-Gonnard69f17282015-05-18 14:35:08 +02004383 ssl->session_negotiate,
4384 ssl->out_msg + 10,
Angus Grattond8213d02016-05-25 20:56:48 +10004385 ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN,
Manuel Pégourié-Gonnardb0394be2015-05-19 11:40:30 +02004386 &tlen, &lifetime ) ) != 0 )
Manuel Pégourié-Gonnard990c51a2013-08-03 15:37:58 +02004387 {
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +02004388 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_ticket_write", ret );
Manuel Pégourié-Gonnard990c51a2013-08-03 15:37:58 +02004389 tlen = 0;
4390 }
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02004391
Joe Subbiani6dd73642021-07-19 11:56:54 +01004392 MBEDTLS_PUT_UINT32_BE( lifetime, ssl->out_msg, 4 );
4393 MBEDTLS_PUT_UINT16_BE( tlen, ssl->out_msg, 8 );
Manuel Pégourié-Gonnard609bc812013-08-01 15:08:40 +02004394 ssl->out_msglen = 10 + tlen;
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02004395
Manuel Pégourié-Gonnard145dfcb2014-02-26 14:23:33 +01004396 /*
4397 * Morally equivalent to updating ssl->state, but NewSessionTicket and
4398 * ChangeCipherSpec share the same state.
4399 */
4400 ssl->handshake->new_session_ticket = 0;
4401
Manuel Pégourié-Gonnard31c15862017-09-13 09:38:11 +02004402 if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02004403 {
Manuel Pégourié-Gonnard31c15862017-09-13 09:38:11 +02004404 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02004405 return( ret );
4406 }
4407
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004408 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write new session ticket" ) );
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02004409
4410 return( 0 );
4411}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004412#endif /* MBEDTLS_SSL_SESSION_TICKETS */
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02004413
Paul Bakker5121ce52009-01-03 21:22:43 +00004414/*
Paul Bakker1961b702013-01-25 14:49:24 +01004415 * SSL handshake -- server side -- single step
Paul Bakker5121ce52009-01-03 21:22:43 +00004416 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004417int mbedtls_ssl_handshake_server_step( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00004418{
4419 int ret = 0;
4420
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004421 MBEDTLS_SSL_DEBUG_MSG( 2, ( "server state: %d", ssl->state ) );
Paul Bakker1961b702013-01-25 14:49:24 +01004422
Paul Bakker1961b702013-01-25 14:49:24 +01004423 switch( ssl->state )
Paul Bakker5121ce52009-01-03 21:22:43 +00004424 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004425 case MBEDTLS_SSL_HELLO_REQUEST:
4426 ssl->state = MBEDTLS_SSL_CLIENT_HELLO;
Paul Bakker5121ce52009-01-03 21:22:43 +00004427 break;
4428
Paul Bakker1961b702013-01-25 14:49:24 +01004429 /*
4430 * <== ClientHello
4431 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004432 case MBEDTLS_SSL_CLIENT_HELLO:
Paul Bakker1961b702013-01-25 14:49:24 +01004433 ret = ssl_parse_client_hello( ssl );
Paul Bakker5121ce52009-01-03 21:22:43 +00004434 break;
Paul Bakker1961b702013-01-25 14:49:24 +01004435
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004436#if defined(MBEDTLS_SSL_PROTO_DTLS)
4437 case MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT:
4438 return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED );
Manuel Pégourié-Gonnard579950c2014-09-29 17:47:33 +02004439#endif
4440
Paul Bakker1961b702013-01-25 14:49:24 +01004441 /*
4442 * ==> ServerHello
4443 * Certificate
4444 * ( ServerKeyExchange )
4445 * ( CertificateRequest )
4446 * ServerHelloDone
4447 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004448 case MBEDTLS_SSL_SERVER_HELLO:
Paul Bakker1961b702013-01-25 14:49:24 +01004449 ret = ssl_write_server_hello( ssl );
4450 break;
4451
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004452 case MBEDTLS_SSL_SERVER_CERTIFICATE:
4453 ret = mbedtls_ssl_write_certificate( ssl );
Paul Bakker1961b702013-01-25 14:49:24 +01004454 break;
4455
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004456 case MBEDTLS_SSL_SERVER_KEY_EXCHANGE:
Paul Bakker1961b702013-01-25 14:49:24 +01004457 ret = ssl_write_server_key_exchange( ssl );
4458 break;
4459
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004460 case MBEDTLS_SSL_CERTIFICATE_REQUEST:
Paul Bakker1961b702013-01-25 14:49:24 +01004461 ret = ssl_write_certificate_request( ssl );
4462 break;
4463
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004464 case MBEDTLS_SSL_SERVER_HELLO_DONE:
Paul Bakker1961b702013-01-25 14:49:24 +01004465 ret = ssl_write_server_hello_done( ssl );
4466 break;
4467
4468 /*
4469 * <== ( Certificate/Alert )
4470 * ClientKeyExchange
4471 * ( CertificateVerify )
4472 * ChangeCipherSpec
4473 * Finished
4474 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004475 case MBEDTLS_SSL_CLIENT_CERTIFICATE:
4476 ret = mbedtls_ssl_parse_certificate( ssl );
Paul Bakker1961b702013-01-25 14:49:24 +01004477 break;
4478
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004479 case MBEDTLS_SSL_CLIENT_KEY_EXCHANGE:
Paul Bakker1961b702013-01-25 14:49:24 +01004480 ret = ssl_parse_client_key_exchange( ssl );
4481 break;
4482
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004483 case MBEDTLS_SSL_CERTIFICATE_VERIFY:
Paul Bakker1961b702013-01-25 14:49:24 +01004484 ret = ssl_parse_certificate_verify( ssl );
4485 break;
4486
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004487 case MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC:
4488 ret = mbedtls_ssl_parse_change_cipher_spec( ssl );
Paul Bakker1961b702013-01-25 14:49:24 +01004489 break;
4490
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004491 case MBEDTLS_SSL_CLIENT_FINISHED:
4492 ret = mbedtls_ssl_parse_finished( ssl );
Paul Bakker1961b702013-01-25 14:49:24 +01004493 break;
4494
4495 /*
Manuel Pégourié-Gonnard7a358b82013-08-01 11:47:56 +02004496 * ==> ( NewSessionTicket )
4497 * ChangeCipherSpec
Paul Bakker1961b702013-01-25 14:49:24 +01004498 * Finished
4499 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004500 case MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC:
4501#if defined(MBEDTLS_SSL_SESSION_TICKETS)
Manuel Pégourié-Gonnard7cd59242013-08-02 13:24:41 +02004502 if( ssl->handshake->new_session_ticket != 0 )
4503 ret = ssl_write_new_session_ticket( ssl );
4504 else
Paul Bakkera503a632013-08-14 13:48:06 +02004505#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004506 ret = mbedtls_ssl_write_change_cipher_spec( ssl );
Paul Bakker1961b702013-01-25 14:49:24 +01004507 break;
4508
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004509 case MBEDTLS_SSL_SERVER_FINISHED:
4510 ret = mbedtls_ssl_write_finished( ssl );
Paul Bakker1961b702013-01-25 14:49:24 +01004511 break;
4512
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004513 case MBEDTLS_SSL_FLUSH_BUFFERS:
4514 MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) );
4515 ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
Paul Bakker1961b702013-01-25 14:49:24 +01004516 break;
4517
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004518 case MBEDTLS_SSL_HANDSHAKE_WRAPUP:
4519 mbedtls_ssl_handshake_wrapup( ssl );
Paul Bakker1961b702013-01-25 14:49:24 +01004520 break;
4521
4522 default:
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004523 MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) );
4524 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Paul Bakker5121ce52009-01-03 21:22:43 +00004525 }
4526
Paul Bakker5121ce52009-01-03 21:22:43 +00004527 return( ret );
4528}
TRodziewicz8476f2f2021-06-02 14:34:47 +02004529
TRodziewicz3946f792021-06-14 12:11:18 +02004530void mbedtls_ssl_conf_preference_order( mbedtls_ssl_config *conf, int order )
TRodziewicz8476f2f2021-06-02 14:34:47 +02004531{
TRodziewicz3946f792021-06-14 12:11:18 +02004532 conf->respect_cli_pref = order;
TRodziewicz8476f2f2021-06-02 14:34:47 +02004533}
4534
Jerry Yufb4b6472022-01-27 15:03:26 +08004535#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_PROTO_TLS1_2 */