Jerry Yu | 3cc4c2a | 2021-08-06 16:29:08 +0800 | [diff] [blame] | 1 | /* |
Jerry Yu | b9930e7 | 2021-08-06 17:11:51 +0800 | [diff] [blame] | 2 | * TLS 1.3 server-side functions |
Jerry Yu | 3cc4c2a | 2021-08-06 16:29:08 +0800 | [diff] [blame] | 3 | * |
| 4 | * Copyright The Mbed TLS Contributors |
| 5 | * 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. |
| 18 | */ |
| 19 | |
| 20 | #include "common.h" |
| 21 | |
Jerry Yu | fb4b647 | 2022-01-27 15:03:26 +0800 | [diff] [blame] | 22 | #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_PROTO_TLS1_3) |
Jerry Yu | 3cc4c2a | 2021-08-06 16:29:08 +0800 | [diff] [blame] | 23 | |
Jerry Yu | 687101b | 2021-09-14 16:03:56 +0800 | [diff] [blame] | 24 | #include "mbedtls/debug.h" |
Xiaofei Bai | cba64af | 2022-02-15 10:00:56 +0000 | [diff] [blame] | 25 | #include "mbedtls/error.h" |
| 26 | #include "mbedtls/platform.h" |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 27 | #include "mbedtls/constant_time.h" |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 28 | |
Xiaofei Bai | 9ca09d4 | 2022-02-14 12:57:18 +0000 | [diff] [blame] | 29 | #include "ssl_misc.h" |
| 30 | #include "ssl_tls13_keys.h" |
| 31 | #include "ssl_debug_helpers.h" |
| 32 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 33 | #if defined(MBEDTLS_ECP_C) |
| 34 | #include "mbedtls/ecp.h" |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 35 | #endif /* MBEDTLS_ECP_C */ |
Jerry Yu | 3cc4c2a | 2021-08-06 16:29:08 +0800 | [diff] [blame] | 36 | |
XiaokangQian | a9c5841 | 2022-02-17 09:41:26 +0000 | [diff] [blame] | 37 | #if defined(MBEDTLS_PLATFORM_C) |
| 38 | #include "mbedtls/platform.h" |
| 39 | #else |
| 40 | #include <stdlib.h> |
| 41 | #define mbedtls_calloc calloc |
| 42 | #define mbedtls_free free |
| 43 | #endif /* MBEDTLS_PLATFORM_C */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 44 | |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 45 | #include "ssl_misc.h" |
| 46 | #include "ssl_tls13_keys.h" |
| 47 | #include "ssl_debug_helpers.h" |
| 48 | |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 49 | |
| 50 | static const mbedtls_ssl_ciphersuite_t *ssl_tls13_get_ciphersuite_info_by_id( |
| 51 | mbedtls_ssl_context *ssl, |
| 52 | uint16_t cipher_suite ) |
| 53 | { |
| 54 | const mbedtls_ssl_ciphersuite_t *ciphersuite_info; |
| 55 | if( ! mbedtls_ssl_tls13_cipher_suite_is_offered( ssl, cipher_suite ) ) |
| 56 | return( NULL ); |
| 57 | |
| 58 | ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( cipher_suite ); |
| 59 | if( ( mbedtls_ssl_validate_ciphersuite( ssl, ciphersuite_info, |
| 60 | ssl->tls_version, |
| 61 | ssl->tls_version ) != 0 ) ) |
| 62 | { |
| 63 | return( NULL ); |
| 64 | } |
| 65 | return( ciphersuite_info ); |
| 66 | } |
| 67 | |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 68 | #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) |
| 69 | /* From RFC 8446: |
| 70 | * |
| 71 | * enum { psk_ke(0), psk_dhe_ke(1), (255) } PskKeyExchangeMode; |
| 72 | * struct { |
| 73 | * PskKeyExchangeMode ke_modes<1..255>; |
| 74 | * } PskKeyExchangeModes; |
| 75 | */ |
Jerry Yu | 6e74a7e | 2022-07-20 20:49:32 +0800 | [diff] [blame] | 76 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 77 | static int ssl_tls13_parse_key_exchange_modes_ext( mbedtls_ssl_context *ssl, |
| 78 | const unsigned char *buf, |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 79 | const unsigned char *end ) |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 80 | { |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 81 | const unsigned char *p = buf; |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 82 | size_t ke_modes_len; |
| 83 | int ke_modes = 0; |
| 84 | |
Jerry Yu | 854dd9e | 2022-07-15 14:28:27 +0800 | [diff] [blame] | 85 | /* Read ke_modes length (1 Byte) */ |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 86 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 1 ); |
| 87 | ke_modes_len = *p++; |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 88 | /* Currently, there are only two PSK modes, so even without looking |
| 89 | * at the content, something's wrong if the list has more than 2 items. */ |
| 90 | if( ke_modes_len > 2 ) |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 91 | { |
| 92 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER, |
| 93 | MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER ); |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 94 | return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 95 | } |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 96 | |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 97 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, ke_modes_len ); |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 98 | |
| 99 | while( ke_modes_len-- != 0 ) |
| 100 | { |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 101 | switch( *p++ ) |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 102 | { |
| 103 | case MBEDTLS_SSL_TLS1_3_PSK_MODE_PURE: |
| 104 | ke_modes |= MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK; |
| 105 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "Found PSK KEX MODE" ) ); |
| 106 | break; |
| 107 | case MBEDTLS_SSL_TLS1_3_PSK_MODE_ECDHE: |
| 108 | ke_modes |= MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL; |
| 109 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "Found PSK_EPHEMERAL KEX MODE" ) ); |
| 110 | break; |
| 111 | default: |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 112 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER, |
| 113 | MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER ); |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 114 | return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER ); |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | ssl->handshake->tls13_kex_modes = ke_modes; |
| 119 | return( 0 ); |
| 120 | } |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 121 | |
Jerry Yu | e9d4fc0 | 2022-08-20 19:21:15 +0800 | [diff] [blame] | 122 | #define SSL_TLS1_3_OFFERED_PSK_NOT_MATCH 1 |
| 123 | #define SSL_TLS1_3_OFFERED_PSK_MATCH 0 |
Jerry Yu | 6e74a7e | 2022-07-20 20:49:32 +0800 | [diff] [blame] | 124 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 125 | static int ssl_tls13_offered_psks_check_identity_match( |
| 126 | mbedtls_ssl_context *ssl, |
| 127 | const unsigned char *identity, |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 128 | size_t identity_len, |
| 129 | int *psk_type ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 130 | { |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 131 | *psk_type = MBEDTLS_SSL_TLS1_3_PSK_EXTERNAL; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 132 | /* Check identity with external configured function */ |
| 133 | if( ssl->conf->f_psk != NULL ) |
| 134 | { |
| 135 | if( ssl->conf->f_psk( |
| 136 | ssl->conf->p_psk, ssl, identity, identity_len ) == 0 ) |
| 137 | { |
| 138 | return( SSL_TLS1_3_OFFERED_PSK_MATCH ); |
| 139 | } |
| 140 | return( SSL_TLS1_3_OFFERED_PSK_NOT_MATCH ); |
| 141 | } |
| 142 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 143 | MBEDTLS_SSL_DEBUG_BUF( 5, "identity", identity, identity_len ); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 144 | /* Check identity with pre-configured psk */ |
Jerry Yu | 2f0abc9 | 2022-07-22 19:34:48 +0800 | [diff] [blame] | 145 | if( ssl->conf->psk_identity != NULL && |
| 146 | identity_len == ssl->conf->psk_identity_len && |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 147 | mbedtls_ct_memcmp( ssl->conf->psk_identity, |
| 148 | identity, identity_len ) == 0 ) |
| 149 | { |
| 150 | mbedtls_ssl_set_hs_psk( ssl, ssl->conf->psk, ssl->conf->psk_len ); |
| 151 | return( SSL_TLS1_3_OFFERED_PSK_MATCH ); |
| 152 | } |
| 153 | |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 154 | return( SSL_TLS1_3_OFFERED_PSK_NOT_MATCH ); |
| 155 | } |
| 156 | |
Jerry Yu | 6e74a7e | 2022-07-20 20:49:32 +0800 | [diff] [blame] | 157 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 158 | static int ssl_tls13_offered_psks_check_binder_match( mbedtls_ssl_context *ssl, |
| 159 | const unsigned char *binder, |
Jerry Yu | e95c8af | 2022-07-26 15:48:20 +0800 | [diff] [blame] | 160 | size_t binder_len, |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 161 | int psk_type, |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 162 | psa_algorithm_t psk_hash_alg ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 163 | { |
| 164 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 165 | |
Jerry Yu | daf375a | 2022-07-20 21:31:43 +0800 | [diff] [blame] | 166 | unsigned char transcript[PSA_HASH_MAX_SIZE]; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 167 | size_t transcript_len; |
Jerry Yu | 2f0abc9 | 2022-07-22 19:34:48 +0800 | [diff] [blame] | 168 | unsigned char *psk; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 169 | size_t psk_len; |
Jerry Yu | daf375a | 2022-07-20 21:31:43 +0800 | [diff] [blame] | 170 | unsigned char server_computed_binder[PSA_HASH_MAX_SIZE]; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 171 | |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 172 | /* Get current state of handshake transcript. */ |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 173 | ret = mbedtls_ssl_get_handshake_transcript( |
| 174 | ssl, mbedtls_hash_info_md_from_psa( psk_hash_alg ), |
| 175 | transcript, sizeof( transcript ), &transcript_len ); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 176 | if( ret != 0 ) |
| 177 | return( ret ); |
| 178 | |
Jerry Yu | 40f3771 | 2022-07-26 16:58:57 +0800 | [diff] [blame] | 179 | ret = mbedtls_ssl_tls13_export_handshake_psk( ssl, &psk, &psk_len ); |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 180 | if( ret != 0 ) |
| 181 | return( ret ); |
| 182 | |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 183 | ret = mbedtls_ssl_tls13_create_psk_binder( ssl, psk_hash_alg, |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 184 | psk, psk_len, psk_type, |
| 185 | transcript, |
| 186 | server_computed_binder ); |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 187 | #if defined(MBEDTLS_USE_PSA_CRYPTO) |
| 188 | mbedtls_free( (void*)psk ); |
| 189 | #endif |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 190 | if( ret != 0 ) |
| 191 | { |
| 192 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "PSK binder calculation failed." ) ); |
| 193 | return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 194 | } |
| 195 | |
| 196 | MBEDTLS_SSL_DEBUG_BUF( 3, "psk binder ( computed ): ", |
Jerry Yu | 2f0abc9 | 2022-07-22 19:34:48 +0800 | [diff] [blame] | 197 | server_computed_binder, transcript_len ); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 198 | MBEDTLS_SSL_DEBUG_BUF( 3, "psk binder ( received ): ", binder, binder_len ); |
| 199 | |
| 200 | if( mbedtls_ct_memcmp( server_computed_binder, binder, binder_len ) == 0 ) |
| 201 | { |
| 202 | return( SSL_TLS1_3_OFFERED_PSK_MATCH ); |
| 203 | } |
| 204 | |
Jerry Yu | daf375a | 2022-07-20 21:31:43 +0800 | [diff] [blame] | 205 | mbedtls_platform_zeroize( server_computed_binder, |
| 206 | sizeof( server_computed_binder ) ); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 207 | return( SSL_TLS1_3_OFFERED_PSK_NOT_MATCH ); |
| 208 | } |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 209 | |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 210 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 211 | static int ssl_tls13_select_ciphersuite_for_psk( |
| 212 | mbedtls_ssl_context *ssl, |
| 213 | const unsigned char *cipher_suites, |
| 214 | const unsigned char *cipher_suites_end, |
| 215 | uint16_t *selected_ciphersuite, |
| 216 | const mbedtls_ssl_ciphersuite_t **selected_ciphersuite_info ) |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 217 | { |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 218 | psa_algorithm_t psk_hash_alg = PSA_ALG_SHA_256; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 219 | |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 220 | /* RFC 8446, page 55. |
| 221 | * |
| 222 | * For externally established PSKs, the Hash algorithm MUST be set when the |
| 223 | * PSK is established or default to SHA-256 if no such algorithm is defined. |
| 224 | * |
| 225 | */ |
| 226 | psk_hash_alg = PSA_ALG_SHA_256; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 227 | |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 228 | /* |
| 229 | * Search for a matching ciphersuite |
| 230 | */ |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 231 | for ( const unsigned char *p = cipher_suites ; |
| 232 | p < cipher_suites_end ; p += 2 ) |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 233 | { |
| 234 | uint16_t cipher_suite; |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 235 | const mbedtls_ssl_ciphersuite_t *ciphersuite_info; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 236 | |
| 237 | cipher_suite = MBEDTLS_GET_UINT16_BE( p, 0 ); |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 238 | ciphersuite_info = ssl_tls13_get_ciphersuite_info_by_id( |
| 239 | ssl,cipher_suite ); |
| 240 | if( ciphersuite_info == NULL ) |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 241 | continue; |
| 242 | |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 243 | /* MAC of selected ciphersuite MUST be same with PSK binder if exist. |
| 244 | * Otherwise, client should reject. |
| 245 | */ |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 246 | if( psk_hash_alg == mbedtls_psa_translate_md( ciphersuite_info->mac ) ) |
| 247 | { |
| 248 | *selected_ciphersuite = cipher_suite; |
| 249 | *selected_ciphersuite_info = ciphersuite_info; |
| 250 | return( 0 ); |
| 251 | } |
| 252 | } |
| 253 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "No matched ciphersuite" ) ); |
| 254 | return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 255 | } |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 256 | |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 257 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 258 | static int ssl_tls13_select_ciphersuite_for_resumption( |
| 259 | mbedtls_ssl_context *ssl, |
| 260 | const unsigned char *cipher_suites, |
| 261 | const unsigned char *cipher_suites_end, |
| 262 | mbedtls_ssl_session *session, |
| 263 | uint16_t *selected_ciphersuite, |
| 264 | const mbedtls_ssl_ciphersuite_t **selected_ciphersuite_info ) |
| 265 | { |
| 266 | ((void) ssl); |
| 267 | ((void) session); |
| 268 | ((void) cipher_suites); |
| 269 | ((void) cipher_suites_end); |
| 270 | ((void) selected_ciphersuite); |
| 271 | ((void) selected_ciphersuite_info); |
| 272 | return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); |
| 273 | } |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 274 | |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 275 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 276 | static int ssl_tls13_select_ciphersuite( |
| 277 | mbedtls_ssl_context *ssl, |
| 278 | const unsigned char *cipher_suites, |
| 279 | const unsigned char *cipher_suites_end, |
| 280 | int psk_type, |
| 281 | mbedtls_ssl_session *session, |
| 282 | uint16_t *selected_ciphersuite, |
| 283 | const mbedtls_ssl_ciphersuite_t **selected_ciphersuite_info ) |
| 284 | { |
| 285 | *selected_ciphersuite = 0; |
| 286 | *selected_ciphersuite_info = NULL; |
| 287 | switch( psk_type ) |
| 288 | { |
| 289 | case MBEDTLS_SSL_TLS1_3_PSK_EXTERNAL: |
| 290 | return( ssl_tls13_select_ciphersuite_for_psk( |
| 291 | ssl, cipher_suites, cipher_suites_end, |
| 292 | selected_ciphersuite, selected_ciphersuite_info ) ); |
| 293 | case MBEDTLS_SSL_TLS1_3_PSK_RESUMPTION: |
| 294 | return( ssl_tls13_select_ciphersuite_for_resumption( |
| 295 | ssl, cipher_suites, cipher_suites_end, session, |
| 296 | selected_ciphersuite, selected_ciphersuite_info ) ); |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 297 | } |
| 298 | |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 299 | return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 300 | } |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 301 | |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 302 | /* Parser for pre_shared_key extension in client hello |
| 303 | * struct { |
| 304 | * opaque identity<1..2^16-1>; |
| 305 | * uint32 obfuscated_ticket_age; |
| 306 | * } PskIdentity; |
| 307 | * |
| 308 | * opaque PskBinderEntry<32..255>; |
| 309 | * |
| 310 | * struct { |
| 311 | * PskIdentity identities<7..2^16-1>; |
| 312 | * PskBinderEntry binders<33..2^16-1>; |
| 313 | * } OfferedPsks; |
| 314 | * |
| 315 | * struct { |
| 316 | * select (Handshake.msg_type) { |
| 317 | * case client_hello: OfferedPsks; |
| 318 | * .... |
| 319 | * }; |
| 320 | * } PreSharedKeyExtension; |
| 321 | */ |
Jerry Yu | 6e74a7e | 2022-07-20 20:49:32 +0800 | [diff] [blame] | 322 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | bb85202 | 2022-07-20 21:10:44 +0800 | [diff] [blame] | 323 | static int ssl_tls13_parse_pre_shared_key_ext( mbedtls_ssl_context *ssl, |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 324 | const unsigned char *pre_shared_key_ext, |
| 325 | const unsigned char *pre_shared_key_ext_end, |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 326 | const unsigned char *ciphersuites, |
| 327 | const unsigned char *ciphersuites_end ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 328 | { |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 329 | const unsigned char *identities = pre_shared_key_ext; |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 330 | const unsigned char *p_identity_len; |
| 331 | size_t identities_len; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 332 | const unsigned char *identities_end; |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 333 | const unsigned char *binders; |
| 334 | const unsigned char *p_binder_len; |
| 335 | size_t binders_len; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 336 | const unsigned char *binders_end; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 337 | int matched_identity = -1; |
| 338 | int identity_id = -1; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 339 | |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 340 | MBEDTLS_SSL_DEBUG_BUF( 3, "pre_shared_key extension", |
| 341 | pre_shared_key_ext, |
| 342 | pre_shared_key_ext_end - pre_shared_key_ext ); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 343 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 344 | /* identities_len 2 bytes |
| 345 | * identities_data >= 7 bytes |
| 346 | */ |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 347 | MBEDTLS_SSL_CHK_BUF_READ_PTR( identities, pre_shared_key_ext_end, 7 + 2 ); |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 348 | identities_len = MBEDTLS_GET_UINT16_BE( identities, 0 ); |
| 349 | p_identity_len = identities + 2; |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 350 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p_identity_len, pre_shared_key_ext_end, |
| 351 | identities_len ); |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 352 | identities_end = p_identity_len + identities_len; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 353 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 354 | /* binders_len 2 bytes |
| 355 | * binders >= 33 bytes |
| 356 | */ |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 357 | binders = identities_end; |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 358 | MBEDTLS_SSL_CHK_BUF_READ_PTR( binders, pre_shared_key_ext_end, 33 + 2 ); |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 359 | binders_len = MBEDTLS_GET_UINT16_BE( binders, 0 ); |
| 360 | p_binder_len = binders + 2; |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 361 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p_binder_len, pre_shared_key_ext_end, binders_len ); |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 362 | binders_end = p_binder_len + binders_len; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 363 | |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 364 | ssl->handshake->update_checksum( ssl, pre_shared_key_ext, |
| 365 | identities_end - pre_shared_key_ext ); |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 366 | |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 367 | while( p_identity_len < identities_end && p_binder_len < binders_end ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 368 | { |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 369 | const unsigned char *identity; |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 370 | size_t identity_len; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 371 | const unsigned char *binder; |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 372 | size_t binder_len; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 373 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 374 | int psk_type; |
| 375 | uint16_t cipher_suite; |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 376 | const mbedtls_ssl_ciphersuite_t *ciphersuite_info; |
Jerry Yu | bb85202 | 2022-07-20 21:10:44 +0800 | [diff] [blame] | 377 | |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 378 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p_identity_len, identities_end, 2 + 1 + 4 ); |
| 379 | identity_len = MBEDTLS_GET_UINT16_BE( p_identity_len, 0 ); |
| 380 | identity = p_identity_len + 2; |
| 381 | MBEDTLS_SSL_CHK_BUF_READ_PTR( identity, identities_end, identity_len + 4 ); |
| 382 | p_identity_len += identity_len + 6; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 383 | |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 384 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p_binder_len, binders_end, 1 + 32 ); |
| 385 | binder_len = *p_binder_len; |
| 386 | binder = p_binder_len + 1; |
| 387 | MBEDTLS_SSL_CHK_BUF_READ_PTR( binder, binders_end, binder_len ); |
| 388 | p_binder_len += binder_len + 1; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 389 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 390 | identity_id++; |
| 391 | if( matched_identity != -1 ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 392 | continue; |
| 393 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 394 | ret = ssl_tls13_offered_psks_check_identity_match( |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 395 | ssl, identity, identity_len, &psk_type ); |
Jerry Yu | e95c8af | 2022-07-26 15:48:20 +0800 | [diff] [blame] | 396 | if( ret != SSL_TLS1_3_OFFERED_PSK_MATCH ) |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 397 | continue; |
| 398 | |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 399 | MBEDTLS_SSL_DEBUG_MSG( 4, ( "found matched identity" ) ); |
| 400 | ret = ssl_tls13_select_ciphersuite( ssl, ciphersuites, ciphersuites_end, |
| 401 | psk_type, NULL, &cipher_suite, |
| 402 | &ciphersuite_info ); |
| 403 | if( ret != 0 ) |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 404 | { |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 405 | /* See below, no cipher_suite available, abort handshake */ |
| 406 | MBEDTLS_SSL_PEND_FATAL_ALERT( |
| 407 | MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR, |
| 408 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 409 | MBEDTLS_SSL_DEBUG_RET( |
| 410 | 2, "ssl_tls13_select_ciphersuite_for_psk", ret ); |
| 411 | return( ret ); |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 412 | } |
| 413 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 414 | ret = ssl_tls13_offered_psks_check_binder_match( |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 415 | ssl, binder, binder_len, psk_type, |
| 416 | mbedtls_psa_translate_md( ciphersuite_info->mac ) ); |
Jerry Yu | e9d4fc0 | 2022-08-20 19:21:15 +0800 | [diff] [blame] | 417 | if( ret != SSL_TLS1_3_OFFERED_PSK_MATCH ) |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 418 | { |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 419 | /* For the security rationale, handshake should be abort when binder |
| 420 | * value mismatch. See RFC 8446 section 4.2.11.2 and appendix E.6. */ |
Jerry Yu | e9d4fc0 | 2022-08-20 19:21:15 +0800 | [diff] [blame] | 421 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "Binder is not matched." ) ); |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 422 | MBEDTLS_SSL_DEBUG_RET( 1, |
| 423 | "ssl_tls13_offered_psks_check_binder_match" , ret ); |
| 424 | MBEDTLS_SSL_PEND_FATAL_ALERT( |
| 425 | MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR, |
| 426 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 427 | return( ret ); |
| 428 | } |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 429 | |
| 430 | matched_identity = identity_id; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 431 | |
| 432 | /* Update handshake parameters */ |
| 433 | if( psk_type == MBEDTLS_SSL_TLS1_3_PSK_EXTERNAL ) |
| 434 | { |
| 435 | ssl->session_negotiate->ciphersuite = cipher_suite; |
| 436 | ssl->handshake->ciphersuite_info = ciphersuite_info; |
| 437 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "overwrite ciphersuite: %04x - %s", |
| 438 | cipher_suite, |
| 439 | ciphersuite_info->name ) ); |
| 440 | } |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 441 | } |
| 442 | |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 443 | if( p_identity_len != identities_end || p_binder_len != binders_end ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 444 | { |
| 445 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "pre_shared_key extesion decode error" ) ); |
| 446 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR, |
| 447 | MBEDTLS_ERR_SSL_DECODE_ERROR ); |
| 448 | return( MBEDTLS_ERR_SSL_DECODE_ERROR ); |
| 449 | } |
| 450 | |
Jerry Yu | 6f1db3f | 2022-07-22 23:05:59 +0800 | [diff] [blame] | 451 | /* Update the handshake transcript with the binder list. */ |
| 452 | ssl->handshake->update_checksum( ssl, |
| 453 | identities_end, |
| 454 | (size_t)( binders_end - identities_end ) ); |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 455 | if( matched_identity == -1 ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 456 | { |
Jerry Yu | e9d4fc0 | 2022-08-20 19:21:15 +0800 | [diff] [blame] | 457 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "No matched PSK or ticket." ) ); |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 458 | return( MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY ); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 459 | } |
| 460 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 461 | ssl->handshake->selected_identity = (uint16_t)matched_identity; |
| 462 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "Pre shared key found" ) ); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 463 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 464 | return( 0 ); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 465 | } |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 466 | |
| 467 | /* |
| 468 | * struct { |
| 469 | * select ( Handshake.msg_type ) { |
| 470 | * .... |
| 471 | * case server_hello: |
| 472 | * uint16 selected_identity; |
| 473 | * } |
| 474 | * } PreSharedKeyExtension; |
| 475 | */ |
Jerry Yu | bb85202 | 2022-07-20 21:10:44 +0800 | [diff] [blame] | 476 | static int ssl_tls13_write_server_pre_shared_key_ext( mbedtls_ssl_context *ssl, |
| 477 | unsigned char *buf, |
| 478 | unsigned char *end, |
| 479 | size_t *olen ) |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 480 | { |
| 481 | unsigned char *p = (unsigned char*)buf; |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 482 | |
| 483 | *olen = 0; |
| 484 | |
| 485 | #if defined(MBEDTLS_USE_PSA_CRYPTO) |
| 486 | if( mbedtls_svc_key_id_is_null( ssl->handshake->psk_opaque ) ) |
| 487 | #else |
| 488 | if( ssl->handshake->psk == NULL ) |
| 489 | #endif |
| 490 | { |
| 491 | /* We shouldn't have called this extension writer unless we've |
| 492 | * chosen to use a PSK. */ |
| 493 | return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| 494 | } |
| 495 | |
| 496 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding pre_shared_key extension" ) ); |
| 497 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 6 ); |
| 498 | |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 499 | MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_PRE_SHARED_KEY, p, 0 ); |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 500 | MBEDTLS_PUT_UINT16_BE( 2, p, 2 ); |
| 501 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 502 | MBEDTLS_PUT_UINT16_BE( ssl->handshake->selected_identity, p, 4 ); |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 503 | |
| 504 | *olen = 6; |
| 505 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 506 | MBEDTLS_SSL_DEBUG_MSG( 4, ( "sent selected_identity: %u", |
| 507 | ssl->handshake->selected_identity ) ); |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 508 | |
| 509 | return( 0 ); |
| 510 | } |
| 511 | |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 512 | #endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */ |
| 513 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 514 | /* From RFC 8446: |
| 515 | * struct { |
XiaokangQian | cfd925f | 2022-04-14 07:10:37 +0000 | [diff] [blame] | 516 | * ProtocolVersion versions<2..254>; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 517 | * } SupportedVersions; |
| 518 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 519 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 520 | static int ssl_tls13_parse_supported_versions_ext( mbedtls_ssl_context *ssl, |
| 521 | const unsigned char *buf, |
| 522 | const unsigned char *end ) |
| 523 | { |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 524 | const unsigned char *p = buf; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 525 | size_t versions_len; |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 526 | const unsigned char *versions_end; |
XiaokangQian | 0a1b54e | 2022-04-21 03:01:38 +0000 | [diff] [blame] | 527 | uint16_t tls_version; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 528 | int tls13_supported = 0; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 529 | |
| 530 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 1 ); |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 531 | versions_len = p[0]; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 532 | p += 1; |
| 533 | |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 534 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, versions_len ); |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 535 | versions_end = p + versions_len; |
| 536 | while( p < versions_end ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 537 | { |
XiaokangQian | cfd925f | 2022-04-14 07:10:37 +0000 | [diff] [blame] | 538 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, versions_end, 2 ); |
XiaokangQian | de33391 | 2022-04-20 08:49:42 +0000 | [diff] [blame] | 539 | tls_version = mbedtls_ssl_read_version( p, ssl->conf->transport ); |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 540 | p += 2; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 541 | |
| 542 | /* In this implementation we only support TLS 1.3 and DTLS 1.3. */ |
XiaokangQian | de33391 | 2022-04-20 08:49:42 +0000 | [diff] [blame] | 543 | if( tls_version == MBEDTLS_SSL_VERSION_TLS1_3 ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 544 | { |
| 545 | tls13_supported = 1; |
| 546 | break; |
| 547 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 548 | } |
| 549 | |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 550 | if( !tls13_supported ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 551 | { |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 552 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLS 1.3 is not supported by the client" ) ); |
| 553 | |
| 554 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION, |
| 555 | MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION ); |
| 556 | return( MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION ); |
| 557 | } |
| 558 | |
XiaokangQian | de33391 | 2022-04-20 08:49:42 +0000 | [diff] [blame] | 559 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "Negotiated version. Supported is [%04x]", |
XiaokangQian | 0a1b54e | 2022-04-21 03:01:38 +0000 | [diff] [blame] | 560 | (unsigned int)tls_version ) ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 561 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 562 | return( 0 ); |
| 563 | } |
| 564 | |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 565 | #if defined(MBEDTLS_ECDH_C) |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 566 | /* |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 567 | * |
| 568 | * From RFC 8446: |
| 569 | * enum { |
| 570 | * ... (0xFFFF) |
| 571 | * } NamedGroup; |
| 572 | * struct { |
| 573 | * NamedGroup named_group_list<2..2^16-1>; |
| 574 | * } NamedGroupList; |
| 575 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 576 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 577 | static int ssl_tls13_parse_supported_groups_ext( mbedtls_ssl_context *ssl, |
| 578 | const unsigned char *buf, |
| 579 | const unsigned char *end ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 580 | { |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 581 | const unsigned char *p = buf; |
XiaokangQian | 8482377 | 2022-04-19 07:57:30 +0000 | [diff] [blame] | 582 | size_t named_group_list_len; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 583 | const unsigned char *named_group_list_end; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 584 | |
| 585 | MBEDTLS_SSL_DEBUG_BUF( 3, "supported_groups extension", p, end - buf ); |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 586 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 ); |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 587 | named_group_list_len = MBEDTLS_GET_UINT16_BE( p, 0 ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 588 | p += 2; |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 589 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, named_group_list_len ); |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 590 | named_group_list_end = p + named_group_list_len; |
XiaokangQian | 4e8cd7b | 2022-04-21 09:48:09 +0000 | [diff] [blame] | 591 | ssl->handshake->hrr_selected_group = 0; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 592 | |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 593 | while( p < named_group_list_end ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 594 | { |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 595 | uint16_t named_group; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 596 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, named_group_list_end, 2 ); |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 597 | named_group = MBEDTLS_GET_UINT16_BE( p, 0 ); |
| 598 | p += 2; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 599 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 600 | MBEDTLS_SSL_DEBUG_MSG( 2, |
| 601 | ( "got named group: %s(%04x)", |
| 602 | mbedtls_ssl_named_group_to_str( named_group ), |
| 603 | named_group ) ); |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 604 | |
| 605 | if( ! mbedtls_ssl_named_group_is_offered( ssl, named_group ) || |
| 606 | ! mbedtls_ssl_named_group_is_supported( named_group ) || |
XiaokangQian | 4e8cd7b | 2022-04-21 09:48:09 +0000 | [diff] [blame] | 607 | ssl->handshake->hrr_selected_group != 0 ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 608 | { |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 609 | continue; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 610 | } |
| 611 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 612 | MBEDTLS_SSL_DEBUG_MSG( 2, |
| 613 | ( "add named group %s(%04x) into received list.", |
| 614 | mbedtls_ssl_named_group_to_str( named_group ), |
| 615 | named_group ) ); |
| 616 | |
XiaokangQian | 4e8cd7b | 2022-04-21 09:48:09 +0000 | [diff] [blame] | 617 | ssl->handshake->hrr_selected_group = named_group; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 618 | } |
| 619 | |
| 620 | return( 0 ); |
| 621 | |
| 622 | } |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 623 | #endif /* MBEDTLS_ECDH_C */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 624 | |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 625 | #define SSL_TLS1_3_PARSE_KEY_SHARES_EXT_NO_MATCH 1 |
| 626 | |
XiaokangQian | 8840888 | 2022-04-02 10:15:03 +0000 | [diff] [blame] | 627 | #if defined(MBEDTLS_ECDH_C) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 628 | /* |
| 629 | * ssl_tls13_parse_key_shares_ext() verifies whether the information in the |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 630 | * extension is correct and stores the first acceptable key share and its associated group. |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 631 | * |
| 632 | * Possible return values are: |
| 633 | * - 0: Successful processing of the client provided key share extension. |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 634 | * - SSL_TLS1_3_PARSE_KEY_SHARES_EXT_NO_MATCH: The key shares provided by the client |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 635 | * does not match a group supported by the server. A HelloRetryRequest will |
| 636 | * be needed. |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 637 | * - A negative value for fatal errors. |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 638 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 639 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 640 | static int ssl_tls13_parse_key_shares_ext( mbedtls_ssl_context *ssl, |
| 641 | const unsigned char *buf, |
| 642 | const unsigned char *end ) |
| 643 | { |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 644 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 645 | unsigned char const *p = buf; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 646 | unsigned char const *client_shares_end; |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 647 | size_t client_shares_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 648 | |
| 649 | /* From RFC 8446: |
| 650 | * |
| 651 | * struct { |
| 652 | * KeyShareEntry client_shares<0..2^16-1>; |
| 653 | * } KeyShareClientHello; |
| 654 | * |
| 655 | */ |
| 656 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 657 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 ); |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 658 | client_shares_len = MBEDTLS_GET_UINT16_BE( p, 0 ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 659 | p += 2; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 660 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, client_shares_len ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 661 | |
| 662 | ssl->handshake->offered_group_id = 0; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 663 | client_shares_end = p + client_shares_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 664 | |
| 665 | /* We try to find a suitable key share entry and copy it to the |
| 666 | * handshake context. Later, we have to find out whether we can do |
| 667 | * something with the provided key share or whether we have to |
XiaokangQian | c5763b5 | 2022-04-02 03:34:37 +0000 | [diff] [blame] | 668 | * dismiss it and send a HelloRetryRequest message. |
| 669 | */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 670 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 671 | while( p < client_shares_end ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 672 | { |
XiaokangQian | 9b5d04b | 2022-04-10 10:20:43 +0000 | [diff] [blame] | 673 | uint16_t group; |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 674 | size_t key_exchange_len; |
Jerry Yu | 086edc2 | 2022-05-05 10:50:38 +0800 | [diff] [blame] | 675 | const unsigned char *key_exchange; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 676 | |
| 677 | /* |
| 678 | * struct { |
| 679 | * NamedGroup group; |
| 680 | * opaque key_exchange<1..2^16-1>; |
| 681 | * } KeyShareEntry; |
| 682 | */ |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 683 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, client_shares_end, 4 ); |
XiaokangQian | 9b5d04b | 2022-04-10 10:20:43 +0000 | [diff] [blame] | 684 | group = MBEDTLS_GET_UINT16_BE( p, 0 ); |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 685 | key_exchange_len = MBEDTLS_GET_UINT16_BE( p, 2 ); |
| 686 | p += 4; |
Jerry Yu | 086edc2 | 2022-05-05 10:50:38 +0800 | [diff] [blame] | 687 | key_exchange = p; |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 688 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, client_shares_end, key_exchange_len ); |
Jerry Yu | 086edc2 | 2022-05-05 10:50:38 +0800 | [diff] [blame] | 689 | p += key_exchange_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 690 | |
| 691 | /* Continue parsing even if we have already found a match, |
XiaokangQian | c5763b5 | 2022-04-02 03:34:37 +0000 | [diff] [blame] | 692 | * for input validation purposes. |
| 693 | */ |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 694 | if( ! mbedtls_ssl_named_group_is_offered( ssl, group ) || |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 695 | ! mbedtls_ssl_named_group_is_supported( group ) || |
| 696 | ssl->handshake->offered_group_id != 0 ) |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 697 | { |
| 698 | continue; |
| 699 | } |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 700 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 701 | /* |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 702 | * For now, we only support ECDHE groups. |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 703 | */ |
XiaokangQian | 9b5d04b | 2022-04-10 10:20:43 +0000 | [diff] [blame] | 704 | if( mbedtls_ssl_tls13_named_group_is_ecdhe( group ) ) |
| 705 | { |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 706 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDH group: %s (%04x)", |
| 707 | mbedtls_ssl_named_group_to_str( group ), |
| 708 | group ) ); |
XiaokangQian | 318dc76 | 2022-04-20 09:43:51 +0000 | [diff] [blame] | 709 | ret = mbedtls_ssl_tls13_read_public_ecdhe_share( |
Jerry Yu | 086edc2 | 2022-05-05 10:50:38 +0800 | [diff] [blame] | 710 | ssl, key_exchange - 2, key_exchange_len + 2 ); |
XiaokangQian | 9b5d04b | 2022-04-10 10:20:43 +0000 | [diff] [blame] | 711 | if( ret != 0 ) |
| 712 | return( ret ); |
XiaokangQian | 4e8cd7b | 2022-04-21 09:48:09 +0000 | [diff] [blame] | 713 | |
XiaokangQian | 9b5d04b | 2022-04-10 10:20:43 +0000 | [diff] [blame] | 714 | } |
| 715 | else |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 716 | { |
| 717 | MBEDTLS_SSL_DEBUG_MSG( 4, ( "Unrecognized NamedGroup %u", |
XiaokangQian | 9b5d04b | 2022-04-10 10:20:43 +0000 | [diff] [blame] | 718 | (unsigned) group ) ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 719 | continue; |
| 720 | } |
| 721 | |
XiaokangQian | 9b5d04b | 2022-04-10 10:20:43 +0000 | [diff] [blame] | 722 | ssl->handshake->offered_group_id = group; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 723 | } |
| 724 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 725 | |
| 726 | if( ssl->handshake->offered_group_id == 0 ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 727 | { |
| 728 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "no matching key share" ) ); |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 729 | return( SSL_TLS1_3_PARSE_KEY_SHARES_EXT_NO_MATCH ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 730 | } |
| 731 | return( 0 ); |
| 732 | } |
XiaokangQian | 8840888 | 2022-04-02 10:15:03 +0000 | [diff] [blame] | 733 | #endif /* MBEDTLS_ECDH_C */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 734 | |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 735 | #if defined(MBEDTLS_DEBUG_C) |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 736 | static void ssl_tls13_debug_print_client_hello_exts( mbedtls_ssl_context *ssl ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 737 | { |
XiaokangQian | 3207a32 | 2022-02-23 03:15:27 +0000 | [diff] [blame] | 738 | ((void) ssl); |
| 739 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 740 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "Supported Extensions:" ) ); |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 741 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 742 | ( "- KEY_SHARE_EXTENSION ( %s )", |
| 743 | ( ( ssl->handshake->extensions_present |
| 744 | & MBEDTLS_SSL_EXT_KEY_SHARE ) > 0 ) ? "TRUE" : "FALSE" ) ); |
| 745 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 746 | ( "- PSK_KEY_EXCHANGE_MODES_EXTENSION ( %s )", |
| 747 | ( ( ssl->handshake->extensions_present |
| 748 | & MBEDTLS_SSL_EXT_PSK_KEY_EXCHANGE_MODES ) > 0 ) ? |
| 749 | "TRUE" : "FALSE" ) ); |
| 750 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 751 | ( "- PRE_SHARED_KEY_EXTENSION ( %s )", |
| 752 | ( ( ssl->handshake->extensions_present |
| 753 | & MBEDTLS_SSL_EXT_PRE_SHARED_KEY ) > 0 ) ? "TRUE" : "FALSE" ) ); |
| 754 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 755 | ( "- SIGNATURE_ALGORITHM_EXTENSION ( %s )", |
| 756 | ( ( ssl->handshake->extensions_present |
| 757 | & MBEDTLS_SSL_EXT_SIG_ALG ) > 0 ) ? "TRUE" : "FALSE" ) ); |
| 758 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 759 | ( "- SUPPORTED_GROUPS_EXTENSION ( %s )", |
| 760 | ( ( ssl->handshake->extensions_present |
| 761 | & MBEDTLS_SSL_EXT_SUPPORTED_GROUPS ) >0 ) ? |
| 762 | "TRUE" : "FALSE" ) ); |
| 763 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 764 | ( "- SUPPORTED_VERSION_EXTENSION ( %s )", |
| 765 | ( ( ssl->handshake->extensions_present |
| 766 | & MBEDTLS_SSL_EXT_SUPPORTED_VERSIONS ) > 0 ) ? |
| 767 | "TRUE" : "FALSE" ) ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 768 | #if defined ( MBEDTLS_SSL_SERVER_NAME_INDICATION ) |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 769 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 770 | ( "- SERVERNAME_EXTENSION ( %s )", |
| 771 | ( ( ssl->handshake->extensions_present |
| 772 | & MBEDTLS_SSL_EXT_SERVERNAME ) > 0 ) ? |
| 773 | "TRUE" : "FALSE" ) ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 774 | #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 775 | #if defined ( MBEDTLS_SSL_ALPN ) |
| 776 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 777 | ( "- ALPN_EXTENSION ( %s )", |
| 778 | ( ( ssl->handshake->extensions_present |
| 779 | & MBEDTLS_SSL_EXT_ALPN ) > 0 ) ? |
| 780 | "TRUE" : "FALSE" ) ); |
| 781 | #endif /* MBEDTLS_SSL_ALPN */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 782 | } |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 783 | #endif /* MBEDTLS_DEBUG_C */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 784 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 785 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 786 | static int ssl_tls13_client_hello_has_exts( mbedtls_ssl_context *ssl, |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 787 | int exts_mask ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 788 | { |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 789 | int masked = ssl->handshake->extensions_present & exts_mask; |
| 790 | return( masked == exts_mask ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 791 | } |
| 792 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 793 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 794 | static int ssl_tls13_client_hello_has_exts_for_ephemeral_key_exchange( |
| 795 | mbedtls_ssl_context *ssl ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 796 | { |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 797 | return( ssl_tls13_client_hello_has_exts( |
| 798 | ssl, |
| 799 | MBEDTLS_SSL_EXT_SUPPORTED_GROUPS | |
| 800 | MBEDTLS_SSL_EXT_KEY_SHARE | |
| 801 | MBEDTLS_SSL_EXT_SIG_ALG ) ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 802 | } |
| 803 | |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 804 | #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) |
| 805 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 806 | static int ssl_tls13_client_hello_has_exts_for_psk_key_exchange( |
| 807 | mbedtls_ssl_context *ssl ) |
| 808 | { |
| 809 | return( ssl_tls13_client_hello_has_exts( |
| 810 | ssl, |
| 811 | MBEDTLS_SSL_EXT_PRE_SHARED_KEY | |
| 812 | MBEDTLS_SSL_EXT_PSK_KEY_EXCHANGE_MODES ) ); |
| 813 | } |
| 814 | |
| 815 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 816 | static int ssl_tls13_client_hello_has_exts_for_psk_ephemeral_key_exchange( |
| 817 | mbedtls_ssl_context *ssl ) |
| 818 | { |
| 819 | return( ssl_tls13_client_hello_has_exts( |
| 820 | ssl, |
| 821 | MBEDTLS_SSL_EXT_SUPPORTED_GROUPS | |
| 822 | MBEDTLS_SSL_EXT_KEY_SHARE | |
| 823 | MBEDTLS_SSL_EXT_PRE_SHARED_KEY | |
| 824 | MBEDTLS_SSL_EXT_PSK_KEY_EXCHANGE_MODES ) ); |
| 825 | } |
| 826 | #endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */ |
| 827 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 828 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 829 | static int ssl_tls13_check_ephemeral_key_exchange( mbedtls_ssl_context *ssl ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 830 | { |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 831 | return( mbedtls_ssl_conf_tls13_ephemeral_enabled( ssl ) && |
| 832 | ssl_tls13_client_hello_has_exts_for_ephemeral_key_exchange( ssl ) ); |
| 833 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 834 | |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 835 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 836 | static int ssl_tls13_check_psk_key_exchange( mbedtls_ssl_context *ssl ) |
| 837 | { |
| 838 | #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) |
| 839 | return( mbedtls_ssl_conf_tls13_psk_enabled( ssl ) && |
| 840 | mbedtls_ssl_tls13_psk_enabled( ssl ) && |
| 841 | ssl_tls13_client_hello_has_exts_for_psk_key_exchange( ssl ) ); |
| 842 | #else |
| 843 | ((void) ssl); |
| 844 | return( 0 ); |
| 845 | #endif |
| 846 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 847 | |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 848 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 849 | static int ssl_tls13_check_psk_ephemeral_key_exchange( mbedtls_ssl_context *ssl ) |
| 850 | { |
| 851 | #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) |
| 852 | return( mbedtls_ssl_conf_tls13_psk_ephemeral_enabled( ssl ) && |
| 853 | mbedtls_ssl_tls13_psk_ephemeral_enabled( ssl ) && |
| 854 | ssl_tls13_client_hello_has_exts_for_psk_ephemeral_key_exchange( ssl ) ); |
| 855 | #else |
| 856 | ((void) ssl); |
| 857 | return( 0 ); |
| 858 | #endif |
| 859 | } |
| 860 | |
| 861 | static int ssl_tls13_determine_key_exchange_mode( mbedtls_ssl_context *ssl ) |
| 862 | { |
| 863 | /* |
| 864 | * Determine the key exchange algorithm to use. |
| 865 | * There are three types of key exchanges supported in TLS 1.3: |
| 866 | * - (EC)DH with ECDSA, |
| 867 | * - (EC)DH with PSK, |
| 868 | * - plain PSK. |
| 869 | * |
| 870 | * The PSK-based key exchanges may additionally be used with 0-RTT. |
| 871 | * |
| 872 | * Our built-in order of preference is |
Jerry Yu | ce6ed70 | 2022-07-22 21:49:53 +0800 | [diff] [blame] | 873 | * 1 ) (EC)DHE-PSK Mode ( psk_ephemeral ) |
| 874 | * 2 ) Certificate Mode ( ephemeral ) |
| 875 | * 3 ) Plain PSK Mode ( psk ) |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 876 | */ |
| 877 | |
| 878 | ssl->handshake->key_exchange_mode = MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_NONE; |
| 879 | |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 880 | if( ssl_tls13_check_psk_ephemeral_key_exchange( ssl ) ) |
| 881 | { |
| 882 | ssl->handshake->key_exchange_mode = |
| 883 | MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL; |
| 884 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "key exchange mode: psk_ephemeral" ) ); |
| 885 | } |
| 886 | else |
| 887 | if( ssl_tls13_check_ephemeral_key_exchange( ssl ) ) |
| 888 | { |
| 889 | ssl->handshake->key_exchange_mode = |
| 890 | MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL; |
| 891 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "key exchange mode: ephemeral" ) ); |
| 892 | } |
| 893 | else |
Jerry Yu | ce6ed70 | 2022-07-22 21:49:53 +0800 | [diff] [blame] | 894 | if( ssl_tls13_check_psk_key_exchange( ssl ) ) |
| 895 | { |
| 896 | ssl->handshake->key_exchange_mode = |
| 897 | MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK; |
| 898 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "key exchange mode: psk" ) ); |
| 899 | } |
| 900 | else |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 901 | { |
| 902 | MBEDTLS_SSL_DEBUG_MSG( |
| 903 | 1, |
| 904 | ( "ClientHello message misses mandatory extensions." ) ); |
| 905 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_MISSING_EXTENSION , |
| 906 | MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER ); |
| 907 | return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER ); |
| 908 | } |
| 909 | |
| 910 | return( 0 ); |
| 911 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 912 | } |
| 913 | |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 914 | #if defined(MBEDTLS_X509_CRT_PARSE_C) && \ |
| 915 | defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 916 | /* |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 917 | * Pick best ( private key, certificate chain ) pair based on the signature |
| 918 | * algorithms supported by the client. |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 919 | */ |
Ronald Cron | ce7d76e | 2022-07-08 18:56:49 +0200 | [diff] [blame] | 920 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | 07aad07 | 2022-06-14 05:35:09 +0000 | [diff] [blame] | 921 | static int ssl_tls13_pick_key_cert( mbedtls_ssl_context *ssl ) |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 922 | { |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 923 | mbedtls_ssl_key_cert *key_cert, *key_cert_list; |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 924 | const uint16_t *sig_alg = ssl->handshake->received_sig_algs; |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 925 | |
| 926 | #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
| 927 | if( ssl->handshake->sni_key_cert != NULL ) |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 928 | key_cert_list = ssl->handshake->sni_key_cert; |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 929 | else |
| 930 | #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 931 | key_cert_list = ssl->conf->key_cert; |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 932 | |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 933 | if( key_cert_list == NULL ) |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 934 | { |
| 935 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "server has no certificate" ) ); |
| 936 | return( -1 ); |
| 937 | } |
| 938 | |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 939 | for( ; *sig_alg != MBEDTLS_TLS1_3_SIG_NONE; sig_alg++ ) |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 940 | { |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 941 | for( key_cert = key_cert_list; key_cert != NULL; |
| 942 | key_cert = key_cert->next ) |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 943 | { |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 944 | MBEDTLS_SSL_DEBUG_CRT( 3, "certificate (chain) candidate", |
| 945 | key_cert->cert ); |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 946 | |
| 947 | /* |
| 948 | * This avoids sending the client a cert it'll reject based on |
| 949 | * keyUsage or other extensions. |
| 950 | */ |
| 951 | if( mbedtls_x509_crt_check_key_usage( |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 952 | key_cert->cert, MBEDTLS_X509_KU_DIGITAL_SIGNATURE ) != 0 || |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 953 | mbedtls_x509_crt_check_extended_key_usage( |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 954 | key_cert->cert, MBEDTLS_OID_SERVER_AUTH, |
| 955 | MBEDTLS_OID_SIZE( MBEDTLS_OID_SERVER_AUTH ) ) != 0 ) |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 956 | { |
| 957 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: " |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 958 | "(extended) key usage extension" ) ); |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 959 | continue; |
| 960 | } |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 961 | |
Jerry Yu | cc53910 | 2022-06-27 16:27:35 +0800 | [diff] [blame] | 962 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 963 | ( "ssl_tls13_pick_key_cert:" |
| 964 | "check signature algorithm %s [%04x]", |
| 965 | mbedtls_ssl_sig_alg_to_str( *sig_alg ), |
| 966 | *sig_alg ) ); |
Jerry Yu | fb52669 | 2022-06-19 11:22:49 +0800 | [diff] [blame] | 967 | if( mbedtls_ssl_tls13_check_sig_alg_cert_key_match( |
Jerry Yu | d099cf0 | 2022-06-19 13:47:00 +0800 | [diff] [blame] | 968 | *sig_alg, &key_cert->cert->pk ) ) |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 969 | { |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 970 | ssl->handshake->key_cert = key_cert; |
Jerry Yu | cc53910 | 2022-06-27 16:27:35 +0800 | [diff] [blame] | 971 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 972 | ( "ssl_tls13_pick_key_cert:" |
| 973 | "selected signature algorithm" |
| 974 | " %s [%04x]", |
| 975 | mbedtls_ssl_sig_alg_to_str( *sig_alg ), |
| 976 | *sig_alg ) ); |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 977 | MBEDTLS_SSL_DEBUG_CRT( |
XiaokangQian | 75fe8c7 | 2022-06-15 09:42:45 +0000 | [diff] [blame] | 978 | 3, "selected certificate (chain)", |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 979 | ssl->handshake->key_cert->cert ); |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 980 | return( 0 ); |
| 981 | } |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 982 | } |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 983 | } |
| 984 | |
Jerry Yu | 9d3e2fa | 2022-06-27 22:14:01 +0800 | [diff] [blame] | 985 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "ssl_tls13_pick_key_cert:" |
| 986 | "no suitable certificate found" ) ); |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 987 | return( -1 ); |
| 988 | } |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 989 | #endif /* MBEDTLS_X509_CRT_PARSE_C && |
| 990 | MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 991 | |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 992 | /* |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 993 | * |
| 994 | * STATE HANDLING: ClientHello |
| 995 | * |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 996 | * There are three possible classes of outcomes when parsing the ClientHello: |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 997 | * |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 998 | * 1) The ClientHello was well-formed and matched the server's configuration. |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 999 | * |
| 1000 | * In this case, the server progresses to sending its ServerHello. |
| 1001 | * |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1002 | * 2) The ClientHello was well-formed but didn't match the server's |
| 1003 | * configuration. |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1004 | * |
| 1005 | * For example, the client might not have offered a key share which |
| 1006 | * the server supports, or the server might require a cookie. |
| 1007 | * |
| 1008 | * In this case, the server sends a HelloRetryRequest. |
| 1009 | * |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1010 | * 3) The ClientHello was ill-formed |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1011 | * |
| 1012 | * In this case, we abort the handshake. |
| 1013 | * |
| 1014 | */ |
| 1015 | |
| 1016 | /* |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1017 | * Structure of this message: |
| 1018 | * |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1019 | * uint16 ProtocolVersion; |
| 1020 | * opaque Random[32]; |
| 1021 | * uint8 CipherSuite[2]; // Cryptographic suite selector |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1022 | * |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1023 | * struct { |
| 1024 | * ProtocolVersion legacy_version = 0x0303; // TLS v1.2 |
| 1025 | * Random random; |
| 1026 | * opaque legacy_session_id<0..32>; |
| 1027 | * CipherSuite cipher_suites<2..2^16-2>; |
| 1028 | * opaque legacy_compression_methods<1..2^8-1>; |
| 1029 | * Extension extensions<8..2^16-1>; |
| 1030 | * } ClientHello; |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1031 | */ |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1032 | |
| 1033 | #define SSL_CLIENT_HELLO_OK 0 |
| 1034 | #define SSL_CLIENT_HELLO_HRR_REQUIRED 1 |
| 1035 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1036 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1037 | static int ssl_tls13_parse_client_hello( mbedtls_ssl_context *ssl, |
| 1038 | const unsigned char *buf, |
| 1039 | const unsigned char *end ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1040 | { |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1041 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 1042 | const unsigned char *p = buf; |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1043 | size_t legacy_session_id_len; |
XiaokangQian | 318dc76 | 2022-04-20 09:43:51 +0000 | [diff] [blame] | 1044 | size_t cipher_suites_len; |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 1045 | const unsigned char *cipher_suites_end; |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1046 | size_t extensions_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1047 | const unsigned char *extensions_end; |
Jerry Yu | 49ca928 | 2022-05-05 11:05:22 +0800 | [diff] [blame] | 1048 | int hrr_required = 0; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1049 | |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1050 | #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1051 | const unsigned char *cipher_suites; |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 1052 | const unsigned char *pre_shared_key_ext = NULL; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1053 | const unsigned char *pre_shared_key_ext_end = NULL; |
| 1054 | #endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1055 | |
| 1056 | ssl->handshake->extensions_present = MBEDTLS_SSL_EXT_NONE; |
| 1057 | |
| 1058 | /* |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1059 | * ClientHello layout: |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1060 | * 0 . 1 protocol version |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1061 | * 2 . 33 random bytes |
XiaokangQian | c5763b5 | 2022-04-02 03:34:37 +0000 | [diff] [blame] | 1062 | * 34 . 34 session id length ( 1 byte ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1063 | * 35 . 34+x session id |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1064 | * .. . .. ciphersuite list length ( 2 bytes ) |
| 1065 | * .. . .. ciphersuite list |
| 1066 | * .. . .. compression alg. list length ( 1 byte ) |
| 1067 | * .. . .. compression alg. list |
| 1068 | * .. . .. extensions length ( 2 bytes, optional ) |
| 1069 | * .. . .. extensions ( optional ) |
| 1070 | */ |
| 1071 | |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1072 | /* |
bootstrap-prime | 6dbbf44 | 2022-05-17 19:30:44 -0400 | [diff] [blame] | 1073 | * Minimal length ( with everything empty and extensions omitted ) is |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1074 | * 2 + 32 + 1 + 2 + 1 = 38 bytes. Check that first, so that we can |
| 1075 | * read at least up to session id length without worrying. |
| 1076 | */ |
| 1077 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 38 ); |
| 1078 | |
| 1079 | /* ... |
| 1080 | * ProtocolVersion legacy_version = 0x0303; // TLS 1.2 |
| 1081 | * ... |
| 1082 | * with ProtocolVersion defined as: |
| 1083 | * uint16 ProtocolVersion; |
| 1084 | */ |
XiaokangQian | de33391 | 2022-04-20 08:49:42 +0000 | [diff] [blame] | 1085 | if( mbedtls_ssl_read_version( p, ssl->conf->transport ) != |
| 1086 | MBEDTLS_SSL_VERSION_TLS1_2 ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1087 | { |
| 1088 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "Unsupported version of TLS." ) ); |
| 1089 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION, |
| 1090 | MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION ); |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1091 | return ( MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1092 | } |
| 1093 | p += 2; |
| 1094 | |
| 1095 | /* |
XiaokangQian | f8ceb94 | 2022-04-15 11:43:27 +0000 | [diff] [blame] | 1096 | * Only support TLS 1.3 currently, temporarily set the version. |
| 1097 | */ |
XiaokangQian | de33391 | 2022-04-20 08:49:42 +0000 | [diff] [blame] | 1098 | ssl->tls_version = MBEDTLS_SSL_VERSION_TLS1_3; |
XiaokangQian | f8ceb94 | 2022-04-15 11:43:27 +0000 | [diff] [blame] | 1099 | |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 1100 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
| 1101 | /* Store minor version for later use with ticket serialization. */ |
| 1102 | ssl->session_negotiate->tls_version = MBEDTLS_SSL_VERSION_TLS1_3; |
Jerry Yu | a66fece | 2022-07-13 14:30:29 +0800 | [diff] [blame] | 1103 | ssl->session_negotiate->endpoint = ssl->conf->endpoint; |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 1104 | #endif |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 1105 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1106 | /* ... |
| 1107 | * Random random; |
| 1108 | * ... |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1109 | * with Random defined as: |
| 1110 | * opaque Random[32]; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1111 | */ |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1112 | MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes", |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 1113 | p, MBEDTLS_CLIENT_HELLO_RANDOM_LEN ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1114 | |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 1115 | memcpy( &ssl->handshake->randbytes[0], p, MBEDTLS_CLIENT_HELLO_RANDOM_LEN ); |
| 1116 | p += MBEDTLS_CLIENT_HELLO_RANDOM_LEN; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1117 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1118 | /* ... |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1119 | * opaque legacy_session_id<0..32>; |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1120 | * ... |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1121 | */ |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1122 | legacy_session_id_len = p[0]; |
XiaokangQian | c5763b5 | 2022-04-02 03:34:37 +0000 | [diff] [blame] | 1123 | p++; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1124 | |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1125 | if( legacy_session_id_len > sizeof( ssl->session_negotiate->id ) ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1126 | { |
| 1127 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 1128 | return( MBEDTLS_ERR_SSL_DECODE_ERROR ); |
| 1129 | } |
| 1130 | |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1131 | ssl->session_negotiate->id_len = legacy_session_id_len; |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1132 | MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1133 | p, legacy_session_id_len ); |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1134 | /* |
| 1135 | * Check we have enough data for the legacy session identifier |
Jerry Yu | e95c8af | 2022-07-26 15:48:20 +0800 | [diff] [blame] | 1136 | * and the ciphersuite list length. |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1137 | */ |
| 1138 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, legacy_session_id_len + 2 ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1139 | |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1140 | memcpy( &ssl->session_negotiate->id[0], p, legacy_session_id_len ); |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1141 | p += legacy_session_id_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1142 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1143 | cipher_suites_len = MBEDTLS_GET_UINT16_BE( p, 0 ); |
| 1144 | p += 2; |
| 1145 | |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1146 | /* Check we have enough data for the ciphersuite list, the legacy |
| 1147 | * compression methods and the length of the extensions. |
Jerry Yu | e95c8af | 2022-07-26 15:48:20 +0800 | [diff] [blame] | 1148 | * |
| 1149 | * cipher_suites cipher_suites_len bytes |
| 1150 | * legacy_compression_methods 2 bytes |
| 1151 | * extensions_len 2 bytes |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1152 | */ |
| 1153 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, cipher_suites_len + 2 + 2 ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1154 | |
Jerry Yu | 24b8c81 | 2022-08-20 19:06:56 +0800 | [diff] [blame] | 1155 | /* ... |
| 1156 | * CipherSuite cipher_suites<2..2^16-2>; |
| 1157 | * ... |
| 1158 | * with CipherSuite defined as: |
| 1159 | * uint8 CipherSuite[2]; |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 1160 | */ |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1161 | #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 1162 | cipher_suites = p; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1163 | #endif |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 1164 | cipher_suites_end = p + cipher_suites_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1165 | MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist", |
| 1166 | p, cipher_suites_len ); |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1167 | |
| 1168 | /* |
| 1169 | * Search for a matching ciphersuite |
| 1170 | */ |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 1171 | for ( ; p < cipher_suites_end; p += 2 ) |
XiaokangQian | 17f974c | 2022-04-19 09:57:41 +0000 | [diff] [blame] | 1172 | { |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1173 | uint16_t cipher_suite; |
Jerry Yu | e95c8af | 2022-07-26 15:48:20 +0800 | [diff] [blame] | 1174 | const mbedtls_ssl_ciphersuite_t* ciphersuite_info; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1175 | |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1176 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, cipher_suites_end, 2 ); |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1177 | |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1178 | cipher_suite = MBEDTLS_GET_UINT16_BE( p, 0 ); |
Jerry Yu | dd1bef7 | 2022-08-23 17:57:02 +0800 | [diff] [blame] | 1179 | ciphersuite_info = ssl_tls13_get_ciphersuite_info_by_id( |
| 1180 | ssl,cipher_suite ); |
| 1181 | if( ciphersuite_info == NULL ) |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1182 | continue; |
| 1183 | |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1184 | ssl->session_negotiate->ciphersuite = cipher_suite; |
| 1185 | ssl->handshake->ciphersuite_info = ciphersuite_info; |
| 1186 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %04x - %s", |
Jerry Yu | e95c8af | 2022-07-26 15:48:20 +0800 | [diff] [blame] | 1187 | cipher_suite, |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1188 | ciphersuite_info->name ) ); |
XiaokangQian | 17f974c | 2022-04-19 09:57:41 +0000 | [diff] [blame] | 1189 | } |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1190 | |
| 1191 | if( ssl->handshake->ciphersuite_info == NULL ) |
| 1192 | { |
| 1193 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE, |
| 1194 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 1195 | return ( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 1196 | } |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1197 | |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1198 | /* ... |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1199 | * opaque legacy_compression_methods<1..2^8-1>; |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1200 | * ... |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1201 | */ |
XiaokangQian | 0a1b54e | 2022-04-21 03:01:38 +0000 | [diff] [blame] | 1202 | if( p[0] != 1 || p[1] != MBEDTLS_SSL_COMPRESS_NULL ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1203 | { |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1204 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad legacy compression method" ) ); |
| 1205 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER, |
| 1206 | MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER ); |
| 1207 | return ( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1208 | } |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1209 | p += 2; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1210 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1211 | /* ... |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1212 | * Extension extensions<8..2^16-1>; |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1213 | * ... |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1214 | * with Extension defined as: |
| 1215 | * struct { |
| 1216 | * ExtensionType extension_type; |
| 1217 | * opaque extension_data<0..2^16-1>; |
| 1218 | * } Extension; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1219 | */ |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1220 | extensions_len = MBEDTLS_GET_UINT16_BE( p, 0 ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1221 | p += 2; |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1222 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, extensions_len ); |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1223 | extensions_end = p + extensions_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1224 | |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1225 | MBEDTLS_SSL_DEBUG_BUF( 3, "client hello extensions", p, extensions_len ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1226 | |
| 1227 | while( p < extensions_end ) |
| 1228 | { |
| 1229 | unsigned int extension_type; |
| 1230 | size_t extension_data_len; |
| 1231 | const unsigned char *extension_data_end; |
| 1232 | |
Jerry Yu | 1c9247c | 2022-07-21 12:37:39 +0800 | [diff] [blame] | 1233 | /* RFC 8446, page 57 |
| 1234 | * |
| 1235 | * The "pre_shared_key" extension MUST be the last extension in the |
| 1236 | * ClientHello (this facilitates implementation as described below). |
| 1237 | * Servers MUST check that it is the last extension and otherwise fail |
| 1238 | * the handshake with an "illegal_parameter" alert. |
| 1239 | */ |
| 1240 | if( ssl->handshake->extensions_present & MBEDTLS_SSL_EXT_PRE_SHARED_KEY ) |
| 1241 | { |
| 1242 | MBEDTLS_SSL_DEBUG_MSG( |
| 1243 | 3, ( "pre_shared_key is not last extension." ) ); |
| 1244 | MBEDTLS_SSL_PEND_FATAL_ALERT( |
| 1245 | MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER, |
| 1246 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 1247 | return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 1248 | } |
| 1249 | |
XiaokangQian | 318dc76 | 2022-04-20 09:43:51 +0000 | [diff] [blame] | 1250 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, extensions_end, 4 ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1251 | extension_type = MBEDTLS_GET_UINT16_BE( p, 0 ); |
| 1252 | extension_data_len = MBEDTLS_GET_UINT16_BE( p, 2 ); |
| 1253 | p += 4; |
| 1254 | |
| 1255 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, extensions_end, extension_data_len ); |
| 1256 | extension_data_end = p + extension_data_len; |
| 1257 | |
| 1258 | switch( extension_type ) |
| 1259 | { |
XiaokangQian | 40a3523 | 2022-05-07 09:02:40 +0000 | [diff] [blame] | 1260 | #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
| 1261 | case MBEDTLS_TLS_EXT_SERVERNAME: |
| 1262 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ServerName extension" ) ); |
XiaokangQian | 9b2b771 | 2022-05-17 02:57:00 +0000 | [diff] [blame] | 1263 | ret = mbedtls_ssl_parse_server_name_ext( ssl, p, |
| 1264 | extension_data_end ); |
XiaokangQian | 40a3523 | 2022-05-07 09:02:40 +0000 | [diff] [blame] | 1265 | if( ret != 0 ) |
| 1266 | { |
| 1267 | MBEDTLS_SSL_DEBUG_RET( |
| 1268 | 1, "mbedtls_ssl_parse_servername_ext", ret ); |
| 1269 | return( ret ); |
| 1270 | } |
| 1271 | ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_SERVERNAME; |
| 1272 | break; |
| 1273 | #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ |
| 1274 | |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1275 | #if defined(MBEDTLS_ECDH_C) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1276 | case MBEDTLS_TLS_EXT_SUPPORTED_GROUPS: |
| 1277 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported group extension" ) ); |
| 1278 | |
| 1279 | /* Supported Groups Extension |
| 1280 | * |
| 1281 | * When sent by the client, the "supported_groups" extension |
| 1282 | * indicates the named groups which the client supports, |
| 1283 | * ordered from most preferred to least preferred. |
| 1284 | */ |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1285 | ret = ssl_tls13_parse_supported_groups_ext( |
| 1286 | ssl, p, extension_data_end ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1287 | if( ret != 0 ) |
| 1288 | { |
| 1289 | MBEDTLS_SSL_DEBUG_RET( 1, |
| 1290 | "mbedtls_ssl_parse_supported_groups_ext", ret ); |
| 1291 | return( ret ); |
| 1292 | } |
| 1293 | |
| 1294 | ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_SUPPORTED_GROUPS; |
| 1295 | break; |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1296 | #endif /* MBEDTLS_ECDH_C */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1297 | |
XiaokangQian | 8840888 | 2022-04-02 10:15:03 +0000 | [diff] [blame] | 1298 | #if defined(MBEDTLS_ECDH_C) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1299 | case MBEDTLS_TLS_EXT_KEY_SHARE: |
| 1300 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "found key share extension" ) ); |
| 1301 | |
| 1302 | /* |
| 1303 | * Key Share Extension |
| 1304 | * |
| 1305 | * When sent by the client, the "key_share" extension |
| 1306 | * contains the endpoint's cryptographic parameters for |
| 1307 | * ECDHE/DHE key establishment methods. |
| 1308 | */ |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1309 | ret = ssl_tls13_parse_key_shares_ext( |
| 1310 | ssl, p, extension_data_end ); |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 1311 | if( ret == SSL_TLS1_3_PARSE_KEY_SHARES_EXT_NO_MATCH ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1312 | { |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1313 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "HRR needed " ) ); |
Jerry Yu | 49ca928 | 2022-05-05 11:05:22 +0800 | [diff] [blame] | 1314 | hrr_required = 1; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1315 | } |
| 1316 | |
Jerry Yu | 582dd06 | 2022-04-22 21:59:01 +0800 | [diff] [blame] | 1317 | if( ret < 0 ) |
| 1318 | { |
| 1319 | MBEDTLS_SSL_DEBUG_RET( |
| 1320 | 1, "ssl_tls13_parse_key_shares_ext", ret ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1321 | return( ret ); |
Jerry Yu | 582dd06 | 2022-04-22 21:59:01 +0800 | [diff] [blame] | 1322 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1323 | |
| 1324 | ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_KEY_SHARE; |
| 1325 | break; |
XiaokangQian | 8840888 | 2022-04-02 10:15:03 +0000 | [diff] [blame] | 1326 | #endif /* MBEDTLS_ECDH_C */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1327 | |
| 1328 | case MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS: |
| 1329 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported versions extension" ) ); |
| 1330 | |
| 1331 | ret = ssl_tls13_parse_supported_versions_ext( |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1332 | ssl, p, extension_data_end ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1333 | if( ret != 0 ) |
| 1334 | { |
| 1335 | MBEDTLS_SSL_DEBUG_RET( 1, |
| 1336 | ( "ssl_tls13_parse_supported_versions_ext" ), ret ); |
| 1337 | return( ret ); |
| 1338 | } |
| 1339 | ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_SUPPORTED_VERSIONS; |
| 1340 | break; |
| 1341 | |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 1342 | #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) |
| 1343 | case MBEDTLS_TLS_EXT_PSK_KEY_EXCHANGE_MODES: |
| 1344 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "found psk key exchange modes extension" ) ); |
| 1345 | |
| 1346 | ret = ssl_tls13_parse_key_exchange_modes_ext( |
| 1347 | ssl, p, extension_data_end ); |
| 1348 | if( ret != 0 ) |
| 1349 | { |
| 1350 | MBEDTLS_SSL_DEBUG_RET( |
| 1351 | 1, "ssl_tls13_parse_key_exchange_modes_ext", ret ); |
| 1352 | return( ret ); |
| 1353 | } |
| 1354 | |
| 1355 | ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_PSK_KEY_EXCHANGE_MODES; |
| 1356 | break; |
| 1357 | #endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */ |
| 1358 | |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1359 | case MBEDTLS_TLS_EXT_PRE_SHARED_KEY: |
| 1360 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "found pre_shared_key extension" ) ); |
Jerry Yu | 13ab81d | 2022-07-22 23:17:11 +0800 | [diff] [blame] | 1361 | if( ( ssl->handshake->extensions_present & |
| 1362 | MBEDTLS_SSL_EXT_PSK_KEY_EXCHANGE_MODES ) == 0 ) |
| 1363 | { |
| 1364 | MBEDTLS_SSL_PEND_FATAL_ALERT( |
| 1365 | MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER, |
| 1366 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 1367 | return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 1368 | } |
Jerry Yu | 1c9247c | 2022-07-21 12:37:39 +0800 | [diff] [blame] | 1369 | #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1370 | /* Delay processing of the PSK identity once we have |
| 1371 | * found out which algorithms to use. We keep a pointer |
| 1372 | * to the buffer and the size for later processing. |
| 1373 | */ |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 1374 | pre_shared_key_ext = p; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1375 | pre_shared_key_ext_end = extension_data_end; |
Jerry Yu | 1c9247c | 2022-07-21 12:37:39 +0800 | [diff] [blame] | 1376 | #endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */ |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1377 | ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_PRE_SHARED_KEY; |
| 1378 | break; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1379 | |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 1380 | #if defined(MBEDTLS_SSL_ALPN) |
| 1381 | case MBEDTLS_TLS_EXT_ALPN: |
| 1382 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) ); |
| 1383 | |
| 1384 | ret = mbedtls_ssl_parse_alpn_ext( ssl, p, extension_data_end ); |
| 1385 | if( ret != 0 ) |
| 1386 | { |
| 1387 | MBEDTLS_SSL_DEBUG_RET( |
| 1388 | 1, ( "mbedtls_ssl_parse_alpn_ext" ), ret ); |
| 1389 | return( ret ); |
| 1390 | } |
| 1391 | ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_ALPN; |
| 1392 | break; |
| 1393 | #endif /* MBEDTLS_SSL_ALPN */ |
| 1394 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1395 | #if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) |
| 1396 | case MBEDTLS_TLS_EXT_SIG_ALG: |
| 1397 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "found signature_algorithms extension" ) ); |
| 1398 | |
Gabor Mezei | 078e803 | 2022-04-27 21:17:56 +0200 | [diff] [blame] | 1399 | ret = mbedtls_ssl_parse_sig_alg_ext( |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1400 | ssl, p, extension_data_end ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1401 | if( ret != 0 ) |
| 1402 | { |
| 1403 | MBEDTLS_SSL_DEBUG_MSG( 1, |
| 1404 | ( "ssl_parse_supported_signature_algorithms_server_ext ( %d )", |
| 1405 | ret ) ); |
| 1406 | return( ret ); |
| 1407 | } |
| 1408 | ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_SIG_ALG; |
| 1409 | break; |
| 1410 | #endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ |
| 1411 | |
| 1412 | default: |
| 1413 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 1414 | ( "unknown extension found: %ud ( ignoring )", |
| 1415 | extension_type ) ); |
| 1416 | } |
| 1417 | |
| 1418 | p += extension_data_len; |
| 1419 | } |
| 1420 | |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1421 | #if defined(MBEDTLS_DEBUG_C) |
| 1422 | /* List all the extensions we have received */ |
| 1423 | ssl_tls13_debug_print_client_hello_exts( ssl ); |
| 1424 | #endif /* MBEDTLS_DEBUG_C */ |
| 1425 | |
| 1426 | mbedtls_ssl_add_hs_hdr_to_checksum( ssl, |
| 1427 | MBEDTLS_SSL_HS_CLIENT_HELLO, |
| 1428 | p - buf ); |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 1429 | |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1430 | #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1431 | /* Update checksum with either |
| 1432 | * - The entire content of the CH message, if no PSK extension is present |
| 1433 | * - The content up to but excluding the PSK extension, if present. |
| 1434 | */ |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1435 | /* If we've settled on a PSK-based exchange, parse PSK identity ext */ |
Jerry Yu | ba9b6e9 | 2022-07-22 21:35:18 +0800 | [diff] [blame] | 1436 | if( mbedtls_ssl_tls13_some_psk_enabled( ssl ) && |
Jerry Yu | 32e1370 | 2022-07-29 13:04:08 +0800 | [diff] [blame] | 1437 | mbedtls_ssl_conf_tls13_some_psk_enabled( ssl ) && |
Jerry Yu | ba9b6e9 | 2022-07-22 21:35:18 +0800 | [diff] [blame] | 1438 | ( ssl->handshake->extensions_present & MBEDTLS_SSL_EXT_PRE_SHARED_KEY ) ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1439 | { |
| 1440 | ssl->handshake->update_checksum( ssl, buf, |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 1441 | pre_shared_key_ext - buf ); |
Jerry Yu | bb85202 | 2022-07-20 21:10:44 +0800 | [diff] [blame] | 1442 | ret = ssl_tls13_parse_pre_shared_key_ext( ssl, |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 1443 | pre_shared_key_ext, |
Jerry Yu | e95c8af | 2022-07-26 15:48:20 +0800 | [diff] [blame] | 1444 | pre_shared_key_ext_end, |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1445 | cipher_suites, |
| 1446 | cipher_suites_end ); |
Jerry Yu | e9d4fc0 | 2022-08-20 19:21:15 +0800 | [diff] [blame] | 1447 | if( ret == MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY ) |
Jerry Yu | ba9b6e9 | 2022-07-22 21:35:18 +0800 | [diff] [blame] | 1448 | { |
| 1449 | ssl->handshake->extensions_present &= ~MBEDTLS_SSL_EXT_PRE_SHARED_KEY; |
Jerry Yu | 6f1db3f | 2022-07-22 23:05:59 +0800 | [diff] [blame] | 1450 | } |
| 1451 | else if( ret != 0 ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1452 | { |
Jerry Yu | bb85202 | 2022-07-20 21:10:44 +0800 | [diff] [blame] | 1453 | MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_tls13_parse_pre_shared_key_ext" ), |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1454 | ret ); |
| 1455 | return( ret ); |
| 1456 | } |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1457 | } |
| 1458 | else |
| 1459 | #endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */ |
| 1460 | { |
| 1461 | ssl->handshake->update_checksum( ssl, buf, p - buf ); |
| 1462 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1463 | |
Jerry Yu | ba9b6e9 | 2022-07-22 21:35:18 +0800 | [diff] [blame] | 1464 | ret = ssl_tls13_determine_key_exchange_mode( ssl ); |
| 1465 | if( ret < 0 ) |
| 1466 | return( ret ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1467 | |
XiaokangQian | 75fe8c7 | 2022-06-15 09:42:45 +0000 | [diff] [blame] | 1468 | return( hrr_required ? SSL_CLIENT_HELLO_HRR_REQUIRED : SSL_CLIENT_HELLO_OK ); |
| 1469 | } |
| 1470 | |
| 1471 | /* Update the handshake state machine */ |
| 1472 | |
Ronald Cron | ce7d76e | 2022-07-08 18:56:49 +0200 | [diff] [blame] | 1473 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | 75fe8c7 | 2022-06-15 09:42:45 +0000 | [diff] [blame] | 1474 | static int ssl_tls13_postprocess_client_hello( mbedtls_ssl_context* ssl ) |
| 1475 | { |
| 1476 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 1477 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1478 | /* |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1479 | * Server certificate selection |
| 1480 | */ |
| 1481 | if( ssl->conf->f_cert_cb && ( ret = ssl->conf->f_cert_cb( ssl ) ) != 0 ) |
| 1482 | { |
| 1483 | MBEDTLS_SSL_DEBUG_RET( 1, "f_cert_cb", ret ); |
| 1484 | return( ret ); |
| 1485 | } |
| 1486 | #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
| 1487 | ssl->handshake->sni_name = NULL; |
| 1488 | ssl->handshake->sni_name_len = 0; |
| 1489 | #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1490 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1491 | ret = mbedtls_ssl_tls13_key_schedule_stage_early( ssl ); |
| 1492 | if( ret != 0 ) |
| 1493 | { |
| 1494 | MBEDTLS_SSL_DEBUG_RET( 1, |
| 1495 | "mbedtls_ssl_tls1_3_key_schedule_stage_early", ret ); |
| 1496 | return( ret ); |
| 1497 | } |
| 1498 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1499 | return( 0 ); |
| 1500 | |
| 1501 | } |
| 1502 | |
| 1503 | /* |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1504 | * Main entry point from the state machine; orchestrates the otherfunctions. |
| 1505 | */ |
| 1506 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1507 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1508 | static int ssl_tls13_process_client_hello( mbedtls_ssl_context *ssl ) |
| 1509 | { |
| 1510 | |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 1511 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1512 | unsigned char* buf = NULL; |
| 1513 | size_t buflen = 0; |
Jerry Yu | 4ca9140 | 2022-05-09 15:50:57 +0800 | [diff] [blame] | 1514 | int parse_client_hello_ret; |
| 1515 | |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1516 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello" ) ); |
| 1517 | |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1518 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_tls13_fetch_handshake_msg( |
| 1519 | ssl, MBEDTLS_SSL_HS_CLIENT_HELLO, |
| 1520 | &buf, &buflen ) ); |
| 1521 | |
| 1522 | MBEDTLS_SSL_PROC_CHK_NEG( ssl_tls13_parse_client_hello( ssl, buf, |
| 1523 | buf + buflen ) ); |
Jerry Yu | f41553b | 2022-05-09 22:20:30 +0800 | [diff] [blame] | 1524 | parse_client_hello_ret = ret; /* Store return value of parse_client_hello, |
| 1525 | * only SSL_CLIENT_HELLO_OK or |
| 1526 | * SSL_CLIENT_HELLO_HRR_REQUIRED at this |
| 1527 | * stage as negative error codes are handled |
| 1528 | * by MBEDTLS_SSL_PROC_CHK_NEG. */ |
Jerry Yu | 4ca9140 | 2022-05-09 15:50:57 +0800 | [diff] [blame] | 1529 | |
XiaokangQian | cfd925f | 2022-04-14 07:10:37 +0000 | [diff] [blame] | 1530 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_postprocess_client_hello( ssl ) ); |
Jerry Yu | 582dd06 | 2022-04-22 21:59:01 +0800 | [diff] [blame] | 1531 | |
Jerry Yu | 4ca9140 | 2022-05-09 15:50:57 +0800 | [diff] [blame] | 1532 | if( parse_client_hello_ret == SSL_CLIENT_HELLO_OK ) |
| 1533 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_SERVER_HELLO ); |
| 1534 | else |
| 1535 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_HELLO_RETRY_REQUEST ); |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1536 | |
| 1537 | cleanup: |
| 1538 | |
| 1539 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello" ) ); |
| 1540 | return( ret ); |
| 1541 | } |
| 1542 | |
| 1543 | /* |
Jerry Yu | 1c3e688 | 2022-04-20 21:23:40 +0800 | [diff] [blame] | 1544 | * Handler for MBEDTLS_SSL_SERVER_HELLO |
Jerry Yu | 5b64ae9 | 2022-03-30 17:15:02 +0800 | [diff] [blame] | 1545 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1546 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1547 | static int ssl_tls13_prepare_server_hello( mbedtls_ssl_context *ssl ) |
| 1548 | { |
Jerry Yu | 637a3f1 | 2022-04-20 21:37:58 +0800 | [diff] [blame] | 1549 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 1550 | unsigned char *server_randbytes = |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1551 | ssl->handshake->randbytes + MBEDTLS_CLIENT_HELLO_RANDOM_LEN; |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1552 | if( ssl->conf->f_rng == NULL ) |
| 1553 | { |
| 1554 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "no RNG provided" ) ); |
| 1555 | return( MBEDTLS_ERR_SSL_NO_RNG ); |
| 1556 | } |
| 1557 | |
Jerry Yu | 637a3f1 | 2022-04-20 21:37:58 +0800 | [diff] [blame] | 1558 | if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, server_randbytes, |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1559 | MBEDTLS_SERVER_HELLO_RANDOM_LEN ) ) != 0 ) |
| 1560 | { |
| 1561 | MBEDTLS_SSL_DEBUG_RET( 1, "f_rng", ret ); |
| 1562 | return( ret ); |
| 1563 | } |
| 1564 | |
Jerry Yu | 637a3f1 | 2022-04-20 21:37:58 +0800 | [diff] [blame] | 1565 | MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", server_randbytes, |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1566 | MBEDTLS_SERVER_HELLO_RANDOM_LEN ); |
| 1567 | |
| 1568 | #if defined(MBEDTLS_HAVE_TIME) |
| 1569 | ssl->session_negotiate->start = time( NULL ); |
| 1570 | #endif /* MBEDTLS_HAVE_TIME */ |
| 1571 | |
| 1572 | return( ret ); |
| 1573 | } |
| 1574 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1575 | /* |
Jerry Yu | e74e04a | 2022-04-21 09:23:16 +0800 | [diff] [blame] | 1576 | * ssl_tls13_write_server_hello_supported_versions_ext (): |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1577 | * |
| 1578 | * struct { |
Jerry Yu | fb9f54d | 2022-04-06 10:08:34 +0800 | [diff] [blame] | 1579 | * ProtocolVersion selected_version; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1580 | * } SupportedVersions; |
| 1581 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1582 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | e74e04a | 2022-04-21 09:23:16 +0800 | [diff] [blame] | 1583 | static int ssl_tls13_write_server_hello_supported_versions_ext( |
| 1584 | mbedtls_ssl_context *ssl, |
| 1585 | unsigned char *buf, |
| 1586 | unsigned char *end, |
| 1587 | size_t *out_len ) |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1588 | { |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1589 | *out_len = 0; |
| 1590 | |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1591 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, write selected version" ) ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1592 | |
| 1593 | /* Check if we have space to write the extension: |
| 1594 | * - extension_type (2 bytes) |
| 1595 | * - extension_data_length (2 bytes) |
Jerry Yu | 349a613 | 2022-04-14 20:52:56 +0800 | [diff] [blame] | 1596 | * - selected_version (2 bytes) |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1597 | */ |
Jerry Yu | 349a613 | 2022-04-14 20:52:56 +0800 | [diff] [blame] | 1598 | MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 6 ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1599 | |
Jerry Yu | 349a613 | 2022-04-14 20:52:56 +0800 | [diff] [blame] | 1600 | MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS, buf, 0 ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1601 | |
Jerry Yu | 349a613 | 2022-04-14 20:52:56 +0800 | [diff] [blame] | 1602 | MBEDTLS_PUT_UINT16_BE( 2, buf, 2 ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1603 | |
Jerry Yu | 349a613 | 2022-04-14 20:52:56 +0800 | [diff] [blame] | 1604 | mbedtls_ssl_write_version( buf + 4, |
| 1605 | ssl->conf->transport, |
| 1606 | ssl->tls_version ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1607 | |
| 1608 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "supported version: [%04x]", |
| 1609 | ssl->tls_version ) ); |
| 1610 | |
Jerry Yu | 349a613 | 2022-04-14 20:52:56 +0800 | [diff] [blame] | 1611 | *out_len = 6; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1612 | |
| 1613 | return( 0 ); |
| 1614 | } |
| 1615 | |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 1616 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1617 | |
| 1618 | /* Generate and export a single key share. For hybrid KEMs, this can |
| 1619 | * be called multiple times with the different components of the hybrid. */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1620 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1621 | static int ssl_tls13_generate_and_write_key_share( mbedtls_ssl_context *ssl, |
| 1622 | uint16_t named_group, |
| 1623 | unsigned char *buf, |
| 1624 | unsigned char *end, |
| 1625 | size_t *out_len ) |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1626 | { |
| 1627 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1628 | |
| 1629 | *out_len = 0; |
| 1630 | |
Jerry Yu | 89e103c | 2022-03-30 22:43:29 +0800 | [diff] [blame] | 1631 | #if defined(MBEDTLS_ECDH_C) |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1632 | if( mbedtls_ssl_tls13_named_group_is_ecdhe( named_group ) ) |
| 1633 | { |
Jerry Yu | 89e103c | 2022-03-30 22:43:29 +0800 | [diff] [blame] | 1634 | ret = mbedtls_ssl_tls13_generate_and_write_ecdh_key_exchange( |
| 1635 | ssl, named_group, buf, end, out_len ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1636 | if( ret != 0 ) |
| 1637 | { |
Jerry Yu | 89e103c | 2022-03-30 22:43:29 +0800 | [diff] [blame] | 1638 | MBEDTLS_SSL_DEBUG_RET( |
| 1639 | 1, "mbedtls_ssl_tls13_generate_and_write_ecdh_key_exchange", |
| 1640 | ret ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1641 | return( ret ); |
| 1642 | } |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1643 | } |
Jerry Yu | 89e103c | 2022-03-30 22:43:29 +0800 | [diff] [blame] | 1644 | else |
| 1645 | #endif /* MBEDTLS_ECDH_C */ |
| 1646 | if( 0 /* Other kinds of KEMs */ ) |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1647 | { |
| 1648 | } |
| 1649 | else |
| 1650 | { |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1651 | ((void) ssl); |
| 1652 | ((void) named_group); |
| 1653 | ((void) buf); |
| 1654 | ((void) end); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1655 | ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; |
| 1656 | } |
| 1657 | |
| 1658 | return( ret ); |
| 1659 | } |
| 1660 | |
| 1661 | /* |
| 1662 | * ssl_tls13_write_key_share_ext |
| 1663 | * |
| 1664 | * Structure of key_share extension in ServerHello: |
| 1665 | * |
Jerry Yu | 1c3e688 | 2022-04-20 21:23:40 +0800 | [diff] [blame] | 1666 | * struct { |
| 1667 | * NamedGroup group; |
| 1668 | * opaque key_exchange<1..2^16-1>; |
| 1669 | * } KeyShareEntry; |
| 1670 | * struct { |
| 1671 | * KeyShareEntry server_share; |
| 1672 | * } KeyShareServerHello; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1673 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1674 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1675 | static int ssl_tls13_write_key_share_ext( mbedtls_ssl_context *ssl, |
| 1676 | unsigned char *buf, |
| 1677 | unsigned char *end, |
| 1678 | size_t *out_len ) |
| 1679 | { |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1680 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1681 | unsigned char *p = buf; |
Jerry Yu | 57d4841 | 2022-04-20 21:50:42 +0800 | [diff] [blame] | 1682 | uint16_t group = ssl->handshake->offered_group_id; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1683 | unsigned char *server_share = buf + 4; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1684 | size_t key_exchange_length; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1685 | |
| 1686 | *out_len = 0; |
| 1687 | |
| 1688 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding key share extension" ) ); |
| 1689 | |
| 1690 | /* Check if we have space for header and length fields: |
| 1691 | * - extension_type (2 bytes) |
| 1692 | * - extension_data_length (2 bytes) |
| 1693 | * - group (2 bytes) |
| 1694 | * - key_exchange_length (2 bytes) |
| 1695 | */ |
| 1696 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 8 ); |
Jerry Yu | 57d4841 | 2022-04-20 21:50:42 +0800 | [diff] [blame] | 1697 | MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_KEY_SHARE, p, 0 ); |
| 1698 | MBEDTLS_PUT_UINT16_BE( group, server_share, 0 ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1699 | p += 8; |
Jerry Yu | 57d4841 | 2022-04-20 21:50:42 +0800 | [diff] [blame] | 1700 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1701 | /* When we introduce PQC-ECDHE hybrids, we'll want to call this |
| 1702 | * function multiple times. */ |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1703 | ret = ssl_tls13_generate_and_write_key_share( |
Jerry Yu | e65d801 | 2022-04-23 10:34:35 +0800 | [diff] [blame] | 1704 | ssl, group, server_share + 4, end, &key_exchange_length ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1705 | if( ret != 0 ) |
| 1706 | return( ret ); |
| 1707 | p += key_exchange_length; |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1708 | |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1709 | MBEDTLS_PUT_UINT16_BE( key_exchange_length, server_share + 2, 0 ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1710 | |
Jerry Yu | 57d4841 | 2022-04-20 21:50:42 +0800 | [diff] [blame] | 1711 | MBEDTLS_PUT_UINT16_BE( p - server_share, buf, 2 ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1712 | |
Jerry Yu | 57d4841 | 2022-04-20 21:50:42 +0800 | [diff] [blame] | 1713 | *out_len = p - buf; |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1714 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1715 | return( 0 ); |
| 1716 | } |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 1717 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1718 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1719 | static int ssl_tls13_write_hrr_key_share_ext( mbedtls_ssl_context *ssl, |
| 1720 | unsigned char *buf, |
| 1721 | unsigned char *end, |
| 1722 | size_t *out_len ) |
| 1723 | { |
| 1724 | uint16_t selected_group = ssl->handshake->hrr_selected_group; |
| 1725 | /* key_share Extension |
| 1726 | * |
| 1727 | * struct { |
| 1728 | * select (Handshake.msg_type) { |
| 1729 | * ... |
| 1730 | * case hello_retry_request: |
| 1731 | * NamedGroup selected_group; |
| 1732 | * ... |
| 1733 | * }; |
| 1734 | * } KeyShare; |
| 1735 | */ |
| 1736 | |
| 1737 | *out_len = 0; |
| 1738 | |
Jerry Yu | b0ac10b | 2022-05-05 11:10:08 +0800 | [diff] [blame] | 1739 | /* |
| 1740 | * For a pure PSK key exchange, there is no group to agree upon. The purpose |
| 1741 | * of the HRR is then to transmit a cookie to force the client to demonstrate |
| 1742 | * reachability at their apparent network address (primarily useful for DTLS). |
| 1743 | */ |
Ronald Cron | 7990771 | 2022-07-20 17:05:29 +0200 | [diff] [blame] | 1744 | if( ! mbedtls_ssl_tls13_key_exchange_mode_with_ephemeral( ssl ) ) |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1745 | return( 0 ); |
| 1746 | |
| 1747 | /* We should only send the key_share extension if the client's initial |
| 1748 | * key share was not acceptable. */ |
| 1749 | if( ssl->handshake->offered_group_id != 0 ) |
| 1750 | { |
| 1751 | MBEDTLS_SSL_DEBUG_MSG( 4, ( "Skip key_share extension in HRR" ) ); |
| 1752 | return( 0 ); |
| 1753 | } |
| 1754 | |
| 1755 | if( selected_group == 0 ) |
| 1756 | { |
| 1757 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "no matching named group found" ) ); |
| 1758 | return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 1759 | } |
| 1760 | |
Jerry Yu | b0ac10b | 2022-05-05 11:10:08 +0800 | [diff] [blame] | 1761 | /* Check if we have enough space: |
| 1762 | * - extension_type (2 bytes) |
| 1763 | * - extension_data_length (2 bytes) |
| 1764 | * - selected_group (2 bytes) |
| 1765 | */ |
Ronald Cron | 154d1b6 | 2022-06-01 15:33:26 +0200 | [diff] [blame] | 1766 | MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 6 ); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1767 | |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1768 | MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_KEY_SHARE, buf, 0 ); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1769 | MBEDTLS_PUT_UINT16_BE( 2, buf, 2 ); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1770 | MBEDTLS_PUT_UINT16_BE( selected_group, buf, 4 ); |
| 1771 | |
| 1772 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 1773 | ( "HRR selected_group: %s (%x)", |
| 1774 | mbedtls_ssl_named_group_to_str( selected_group ), |
| 1775 | selected_group ) ); |
| 1776 | |
| 1777 | *out_len = 6; |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1778 | |
Jerry Yu | b0ac10b | 2022-05-05 11:10:08 +0800 | [diff] [blame] | 1779 | return( 0 ); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1780 | } |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1781 | |
| 1782 | /* |
| 1783 | * Structure of ServerHello message: |
| 1784 | * |
| 1785 | * struct { |
| 1786 | * ProtocolVersion legacy_version = 0x0303; // TLS v1.2 |
| 1787 | * Random random; |
| 1788 | * opaque legacy_session_id_echo<0..32>; |
| 1789 | * CipherSuite cipher_suite; |
| 1790 | * uint8 legacy_compression_method = 0; |
| 1791 | * Extension extensions<6..2^16-1>; |
| 1792 | * } ServerHello; |
| 1793 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1794 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1795 | static int ssl_tls13_write_server_hello_body( mbedtls_ssl_context *ssl, |
Jerry Yu | 56404d7 | 2022-03-30 17:36:13 +0800 | [diff] [blame] | 1796 | unsigned char *buf, |
| 1797 | unsigned char *end, |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1798 | size_t *out_len, |
| 1799 | int is_hrr ) |
Jerry Yu | 56404d7 | 2022-03-30 17:36:13 +0800 | [diff] [blame] | 1800 | { |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1801 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1802 | unsigned char *p = buf; |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 1803 | unsigned char *p_extensions_len; |
Jerry Yu | fbe3e64 | 2022-04-25 19:31:51 +0800 | [diff] [blame] | 1804 | size_t output_len; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1805 | |
| 1806 | *out_len = 0; |
| 1807 | |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 1808 | /* ... |
| 1809 | * ProtocolVersion legacy_version = 0x0303; // TLS 1.2 |
| 1810 | * ... |
| 1811 | * with ProtocolVersion defined as: |
| 1812 | * uint16 ProtocolVersion; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1813 | */ |
| 1814 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 ); |
| 1815 | MBEDTLS_PUT_UINT16_BE( 0x0303, p, 0 ); |
| 1816 | p += 2; |
| 1817 | |
Jerry Yu | 1c3e688 | 2022-04-20 21:23:40 +0800 | [diff] [blame] | 1818 | /* ... |
| 1819 | * Random random; |
| 1820 | * ... |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 1821 | * with Random defined as: |
| 1822 | * opaque Random[MBEDTLS_SERVER_HELLO_RANDOM_LEN]; |
Jerry Yu | 1c3e688 | 2022-04-20 21:23:40 +0800 | [diff] [blame] | 1823 | */ |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1824 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, MBEDTLS_SERVER_HELLO_RANDOM_LEN ); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1825 | if( is_hrr ) |
| 1826 | { |
| 1827 | memcpy( p, mbedtls_ssl_tls13_hello_retry_request_magic, |
Jerry Yu | fbe3e64 | 2022-04-25 19:31:51 +0800 | [diff] [blame] | 1828 | MBEDTLS_SERVER_HELLO_RANDOM_LEN ); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1829 | } |
| 1830 | else |
| 1831 | { |
| 1832 | memcpy( p, &ssl->handshake->randbytes[MBEDTLS_CLIENT_HELLO_RANDOM_LEN], |
Jerry Yu | fbe3e64 | 2022-04-25 19:31:51 +0800 | [diff] [blame] | 1833 | MBEDTLS_SERVER_HELLO_RANDOM_LEN ); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1834 | } |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1835 | MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1836 | p, MBEDTLS_SERVER_HELLO_RANDOM_LEN ); |
| 1837 | p += MBEDTLS_SERVER_HELLO_RANDOM_LEN; |
| 1838 | |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 1839 | /* ... |
| 1840 | * opaque legacy_session_id_echo<0..32>; |
| 1841 | * ... |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1842 | */ |
| 1843 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 1 + ssl->session_negotiate->id_len ); |
| 1844 | *p++ = (unsigned char)ssl->session_negotiate->id_len; |
| 1845 | if( ssl->session_negotiate->id_len > 0 ) |
| 1846 | { |
| 1847 | memcpy( p, &ssl->session_negotiate->id[0], |
| 1848 | ssl->session_negotiate->id_len ); |
| 1849 | p += ssl->session_negotiate->id_len; |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1850 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1851 | MBEDTLS_SSL_DEBUG_BUF( 3, "session id", ssl->session_negotiate->id, |
| 1852 | ssl->session_negotiate->id_len ); |
| 1853 | } |
| 1854 | |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 1855 | /* ... |
| 1856 | * CipherSuite cipher_suite; |
| 1857 | * ... |
| 1858 | * with CipherSuite defined as: |
| 1859 | * uint8 CipherSuite[2]; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1860 | */ |
| 1861 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 ); |
| 1862 | MBEDTLS_PUT_UINT16_BE( ssl->session_negotiate->ciphersuite, p, 0 ); |
| 1863 | p += 2; |
| 1864 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 1865 | ( "server hello, chosen ciphersuite: %s ( id=%d )", |
| 1866 | mbedtls_ssl_get_ciphersuite_name( |
| 1867 | ssl->session_negotiate->ciphersuite ), |
| 1868 | ssl->session_negotiate->ciphersuite ) ); |
| 1869 | |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 1870 | /* ... |
| 1871 | * uint8 legacy_compression_method = 0; |
| 1872 | * ... |
| 1873 | */ |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1874 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 1 ); |
Thomas Daubney | 31e03a8 | 2022-07-25 15:59:25 +0100 | [diff] [blame] | 1875 | *p++ = MBEDTLS_SSL_COMPRESS_NULL; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1876 | |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 1877 | /* ... |
| 1878 | * Extension extensions<6..2^16-1>; |
| 1879 | * ... |
| 1880 | * struct { |
| 1881 | * ExtensionType extension_type; (2 bytes) |
| 1882 | * opaque extension_data<0..2^16-1>; |
| 1883 | * } Extension; |
| 1884 | */ |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1885 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 ); |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 1886 | p_extensions_len = p; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1887 | p += 2; |
| 1888 | |
Jerry Yu | e74e04a | 2022-04-21 09:23:16 +0800 | [diff] [blame] | 1889 | if( ( ret = ssl_tls13_write_server_hello_supported_versions_ext( |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1890 | ssl, p, end, &output_len ) ) != 0 ) |
| 1891 | { |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1892 | MBEDTLS_SSL_DEBUG_RET( |
| 1893 | 1, "ssl_tls13_write_server_hello_supported_versions_ext", ret ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1894 | return( ret ); |
| 1895 | } |
| 1896 | p += output_len; |
| 1897 | |
Jerry Yu | 56acc94 | 2022-07-30 23:02:36 +0800 | [diff] [blame] | 1898 | if( mbedtls_ssl_tls13_key_exchange_mode_with_ephemeral( ssl ) ) |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1899 | { |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1900 | if( is_hrr ) |
| 1901 | ret = ssl_tls13_write_hrr_key_share_ext( ssl, p, end, &output_len ); |
| 1902 | else |
| 1903 | ret = ssl_tls13_write_key_share_ext( ssl, p, end, &output_len ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1904 | if( ret != 0 ) |
| 1905 | return( ret ); |
| 1906 | p += output_len; |
| 1907 | } |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1908 | |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 1909 | #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 1910 | if( mbedtls_ssl_tls13_key_exchange_mode_with_psk( ssl ) ) |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 1911 | { |
Jerry Yu | bb85202 | 2022-07-20 21:10:44 +0800 | [diff] [blame] | 1912 | ret = ssl_tls13_write_server_pre_shared_key_ext( ssl, p, end, &output_len ); |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 1913 | if( ret != 0 ) |
| 1914 | { |
Jerry Yu | bb85202 | 2022-07-20 21:10:44 +0800 | [diff] [blame] | 1915 | MBEDTLS_SSL_DEBUG_RET( 1, "ssl_tls13_write_server_pre_shared_key_ext", |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 1916 | ret ); |
| 1917 | return( ret ); |
| 1918 | } |
| 1919 | p += output_len; |
| 1920 | } |
| 1921 | #endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */ |
| 1922 | |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 1923 | MBEDTLS_PUT_UINT16_BE( p - p_extensions_len - 2, p_extensions_len, 0 ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1924 | |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 1925 | MBEDTLS_SSL_DEBUG_BUF( 4, "server hello extensions", |
| 1926 | p_extensions_len, p - p_extensions_len ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1927 | |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 1928 | *out_len = p - buf; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1929 | |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 1930 | MBEDTLS_SSL_DEBUG_BUF( 3, "server hello", buf, *out_len ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1931 | |
| 1932 | return( ret ); |
Jerry Yu | 56404d7 | 2022-03-30 17:36:13 +0800 | [diff] [blame] | 1933 | } |
| 1934 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1935 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | e110d25 | 2022-05-05 10:19:22 +0800 | [diff] [blame] | 1936 | static int ssl_tls13_finalize_write_server_hello( mbedtls_ssl_context *ssl ) |
| 1937 | { |
| 1938 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | f86eb75 | 2022-05-06 11:16:55 +0800 | [diff] [blame] | 1939 | ret = mbedtls_ssl_tls13_compute_handshake_transform( ssl ); |
Jerry Yu | e110d25 | 2022-05-05 10:19:22 +0800 | [diff] [blame] | 1940 | if( ret != 0 ) |
| 1941 | { |
Jerry Yu | f86eb75 | 2022-05-06 11:16:55 +0800 | [diff] [blame] | 1942 | MBEDTLS_SSL_DEBUG_RET( 1, |
| 1943 | "mbedtls_ssl_tls13_compute_handshake_transform", |
Jerry Yu | e110d25 | 2022-05-05 10:19:22 +0800 | [diff] [blame] | 1944 | ret ); |
| 1945 | return( ret ); |
| 1946 | } |
| 1947 | |
Jerry Yu | e110d25 | 2022-05-05 10:19:22 +0800 | [diff] [blame] | 1948 | return( ret ); |
| 1949 | } |
| 1950 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1951 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 5b64ae9 | 2022-03-30 17:15:02 +0800 | [diff] [blame] | 1952 | static int ssl_tls13_write_server_hello( mbedtls_ssl_context *ssl ) |
| 1953 | { |
Jerry Yu | 637a3f1 | 2022-04-20 21:37:58 +0800 | [diff] [blame] | 1954 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1955 | unsigned char *buf; |
| 1956 | size_t buf_len, msg_len; |
| 1957 | |
| 1958 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server hello" ) ); |
| 1959 | |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1960 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_prepare_server_hello( ssl ) ); |
| 1961 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1962 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_start_handshake_msg( ssl, |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1963 | MBEDTLS_SSL_HS_SERVER_HELLO, &buf, &buf_len ) ); |
| 1964 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1965 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_server_hello_body( ssl, buf, |
| 1966 | buf + buf_len, |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1967 | &msg_len, |
| 1968 | 0 ) ); |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1969 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1970 | mbedtls_ssl_add_hs_msg_to_checksum( |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1971 | ssl, MBEDTLS_SSL_HS_SERVER_HELLO, buf, msg_len ); |
| 1972 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1973 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_finish_handshake_msg( |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1974 | ssl, buf_len, msg_len ) ); |
Jerry Yu | 637a3f1 | 2022-04-20 21:37:58 +0800 | [diff] [blame] | 1975 | |
Jerry Yu | e110d25 | 2022-05-05 10:19:22 +0800 | [diff] [blame] | 1976 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_finalize_write_server_hello( ssl ) ); |
| 1977 | |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 1978 | #if defined(MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE) |
| 1979 | /* The server sends a dummy change_cipher_spec record immediately |
| 1980 | * after its first handshake message. This may either be after |
| 1981 | * a ServerHello or a HelloRetryRequest. |
| 1982 | */ |
Gabor Mezei | 96ae926 | 2022-06-28 11:45:18 +0200 | [diff] [blame] | 1983 | mbedtls_ssl_handshake_set_state( |
| 1984 | ssl, MBEDTLS_SSL_SERVER_CCS_AFTER_SERVER_HELLO ); |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 1985 | #else |
Jerry Yu | 637a3f1 | 2022-04-20 21:37:58 +0800 | [diff] [blame] | 1986 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_ENCRYPTED_EXTENSIONS ); |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 1987 | #endif /* MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE */ |
Jerry Yu | e110d25 | 2022-05-05 10:19:22 +0800 | [diff] [blame] | 1988 | |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1989 | cleanup: |
| 1990 | |
| 1991 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello" ) ); |
| 1992 | return( ret ); |
Jerry Yu | 5b64ae9 | 2022-03-30 17:15:02 +0800 | [diff] [blame] | 1993 | } |
| 1994 | |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 1995 | |
| 1996 | /* |
| 1997 | * Handler for MBEDTLS_SSL_HELLO_RETRY_REQUEST |
| 1998 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1999 | MBEDTLS_CHECK_RETURN_CRITICAL |
Ronald Cron | 7b84046 | 2022-06-01 17:05:53 +0200 | [diff] [blame] | 2000 | static int ssl_tls13_prepare_hello_retry_request( mbedtls_ssl_context *ssl ) |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2001 | { |
| 2002 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2003 | if( ssl->handshake->hello_retry_request_count > 0 ) |
| 2004 | { |
| 2005 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "Too many HRRs" ) ); |
| 2006 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE, |
| 2007 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 2008 | return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 2009 | } |
| 2010 | |
| 2011 | /* |
| 2012 | * Create stateless transcript hash for HRR |
| 2013 | */ |
| 2014 | MBEDTLS_SSL_DEBUG_MSG( 4, ( "Reset transcript for HRR" ) ); |
| 2015 | ret = mbedtls_ssl_reset_transcript_for_hrr( ssl ); |
| 2016 | if( ret != 0 ) |
| 2017 | { |
| 2018 | MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_reset_transcript_for_hrr", ret ); |
| 2019 | return( ret ); |
| 2020 | } |
| 2021 | mbedtls_ssl_session_reset_msg_layer( ssl, 0 ); |
| 2022 | |
| 2023 | return( 0 ); |
| 2024 | } |
| 2025 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2026 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2027 | static int ssl_tls13_write_hello_retry_request( mbedtls_ssl_context *ssl ) |
| 2028 | { |
| 2029 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2030 | unsigned char *buf; |
| 2031 | size_t buf_len, msg_len; |
| 2032 | |
| 2033 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello retry request" ) ); |
| 2034 | |
Ronald Cron | 7b84046 | 2022-06-01 17:05:53 +0200 | [diff] [blame] | 2035 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_prepare_hello_retry_request( ssl ) ); |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2036 | |
| 2037 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_start_handshake_msg( |
| 2038 | ssl, MBEDTLS_SSL_HS_SERVER_HELLO, |
| 2039 | &buf, &buf_len ) ); |
| 2040 | |
| 2041 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_server_hello_body( ssl, buf, |
| 2042 | buf + buf_len, |
| 2043 | &msg_len, |
| 2044 | 1 ) ); |
| 2045 | mbedtls_ssl_add_hs_msg_to_checksum( |
| 2046 | ssl, MBEDTLS_SSL_HS_SERVER_HELLO, buf, msg_len ); |
| 2047 | |
| 2048 | |
| 2049 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_finish_handshake_msg( ssl, buf_len, |
| 2050 | msg_len ) ); |
| 2051 | |
| 2052 | ssl->handshake->hello_retry_request_count++; |
| 2053 | |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 2054 | #if defined(MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE) |
| 2055 | /* The server sends a dummy change_cipher_spec record immediately |
| 2056 | * after its first handshake message. This may either be after |
| 2057 | * a ServerHello or a HelloRetryRequest. |
| 2058 | */ |
Gabor Mezei | 96ae926 | 2022-06-28 11:45:18 +0200 | [diff] [blame] | 2059 | mbedtls_ssl_handshake_set_state( |
Gabor Mezei | f7044ea | 2022-06-28 16:01:49 +0200 | [diff] [blame] | 2060 | ssl, MBEDTLS_SSL_SERVER_CCS_AFTER_HELLO_RETRY_REQUEST ); |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 2061 | #else |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2062 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CLIENT_HELLO ); |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 2063 | #endif /* MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE */ |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2064 | |
| 2065 | cleanup: |
| 2066 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello retry request" ) ); |
| 2067 | return( ret ); |
| 2068 | } |
| 2069 | |
Jerry Yu | 5b64ae9 | 2022-03-30 17:15:02 +0800 | [diff] [blame] | 2070 | /* |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2071 | * Handler for MBEDTLS_SSL_ENCRYPTED_EXTENSIONS |
| 2072 | */ |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2073 | |
| 2074 | /* |
| 2075 | * struct { |
| 2076 | * Extension extensions<0..2 ^ 16 - 1>; |
| 2077 | * } EncryptedExtensions; |
| 2078 | * |
| 2079 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2080 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2081 | static int ssl_tls13_write_encrypted_extensions_body( mbedtls_ssl_context *ssl, |
| 2082 | unsigned char *buf, |
| 2083 | unsigned char *end, |
| 2084 | size_t *out_len ) |
| 2085 | { |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 2086 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2087 | unsigned char *p = buf; |
| 2088 | size_t extensions_len = 0; |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2089 | unsigned char *p_extensions_len; |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 2090 | size_t output_len; |
Jerry Yu | 9da5e5a | 2022-05-03 15:46:09 +0800 | [diff] [blame] | 2091 | |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2092 | *out_len = 0; |
| 2093 | |
| 2094 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 ); |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2095 | p_extensions_len = p; |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2096 | p += 2; |
| 2097 | |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2098 | ((void) ssl); |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 2099 | ((void) ret); |
| 2100 | ((void) output_len); |
| 2101 | |
| 2102 | #if defined(MBEDTLS_SSL_ALPN) |
| 2103 | ret = mbedtls_ssl_write_alpn_ext( ssl, p, end, &output_len ); |
| 2104 | if( ret != 0 ) |
| 2105 | return( ret ); |
XiaokangQian | 95d5f54 | 2022-06-24 02:29:26 +0000 | [diff] [blame] | 2106 | p += output_len; |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 2107 | #endif /* MBEDTLS_SSL_ALPN */ |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2108 | |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2109 | extensions_len = ( p - p_extensions_len ) - 2; |
| 2110 | MBEDTLS_PUT_UINT16_BE( extensions_len, p_extensions_len, 0 ); |
| 2111 | |
| 2112 | *out_len = p - buf; |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2113 | |
| 2114 | MBEDTLS_SSL_DEBUG_BUF( 4, "encrypted extensions", buf, *out_len ); |
| 2115 | |
| 2116 | return( 0 ); |
| 2117 | } |
| 2118 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2119 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2120 | static int ssl_tls13_write_encrypted_extensions( mbedtls_ssl_context *ssl ) |
| 2121 | { |
| 2122 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2123 | unsigned char *buf; |
Jerry Yu | 39730a7 | 2022-05-03 12:14:04 +0800 | [diff] [blame] | 2124 | size_t buf_len, msg_len; |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2125 | |
Gabor Mezei | 5471912 | 2022-06-28 11:34:56 +0200 | [diff] [blame] | 2126 | mbedtls_ssl_set_outbound_transform( ssl, |
| 2127 | ssl->handshake->transform_handshake ); |
| 2128 | MBEDTLS_SSL_DEBUG_MSG( |
| 2129 | 3, ( "switching to handshake transform for outbound data" ) ); |
| 2130 | |
Jerry Yu | ab452cc | 2022-04-28 15:27:08 +0800 | [diff] [blame] | 2131 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write encrypted extensions" ) ); |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2132 | |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2133 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_start_handshake_msg( ssl, |
| 2134 | MBEDTLS_SSL_HS_ENCRYPTED_EXTENSIONS, &buf, &buf_len ) ); |
| 2135 | |
| 2136 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_encrypted_extensions_body( |
| 2137 | ssl, buf, buf + buf_len, &msg_len ) ); |
| 2138 | |
| 2139 | mbedtls_ssl_add_hs_msg_to_checksum( |
| 2140 | ssl, MBEDTLS_SSL_HS_ENCRYPTED_EXTENSIONS, buf, msg_len ); |
| 2141 | |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2142 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_finish_handshake_msg( |
| 2143 | ssl, buf_len, msg_len ) ); |
| 2144 | |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2145 | #if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) |
Ronald Cron | 7990771 | 2022-07-20 17:05:29 +0200 | [diff] [blame] | 2146 | if( mbedtls_ssl_tls13_key_exchange_mode_with_psk( ssl ) ) |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2147 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_SERVER_FINISHED ); |
| 2148 | else |
XiaokangQian | a987e1d | 2022-05-07 01:25:58 +0000 | [diff] [blame] | 2149 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CERTIFICATE_REQUEST ); |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2150 | #else |
| 2151 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_SERVER_FINISHED ); |
| 2152 | #endif |
| 2153 | |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2154 | cleanup: |
| 2155 | |
Jerry Yu | ab452cc | 2022-04-28 15:27:08 +0800 | [diff] [blame] | 2156 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write encrypted extensions" ) ); |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2157 | return( ret ); |
| 2158 | } |
| 2159 | |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2160 | #if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) |
XiaokangQian | a987e1d | 2022-05-07 01:25:58 +0000 | [diff] [blame] | 2161 | #define SSL_CERTIFICATE_REQUEST_SEND_REQUEST 0 |
| 2162 | #define SSL_CERTIFICATE_REQUEST_SKIP 1 |
| 2163 | /* Coordination: |
| 2164 | * Check whether a CertificateRequest message should be written. |
| 2165 | * Returns a negative code on failure, or |
| 2166 | * - SSL_CERTIFICATE_REQUEST_SEND_REQUEST |
| 2167 | * - SSL_CERTIFICATE_REQUEST_SKIP |
| 2168 | * indicating if the writing of the CertificateRequest |
| 2169 | * should be skipped or not. |
| 2170 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2171 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | a987e1d | 2022-05-07 01:25:58 +0000 | [diff] [blame] | 2172 | static int ssl_tls13_certificate_request_coordinate( mbedtls_ssl_context *ssl ) |
| 2173 | { |
| 2174 | int authmode; |
| 2175 | |
XiaokangQian | 40a3523 | 2022-05-07 09:02:40 +0000 | [diff] [blame] | 2176 | #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
| 2177 | if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET ) |
| 2178 | authmode = ssl->handshake->sni_authmode; |
| 2179 | else |
| 2180 | #endif |
XiaokangQian | a987e1d | 2022-05-07 01:25:58 +0000 | [diff] [blame] | 2181 | authmode = ssl->conf->authmode; |
| 2182 | |
| 2183 | if( authmode == MBEDTLS_SSL_VERIFY_NONE ) |
| 2184 | return( SSL_CERTIFICATE_REQUEST_SKIP ); |
| 2185 | |
XiaokangQian | c3017f6 | 2022-05-13 05:55:41 +0000 | [diff] [blame] | 2186 | ssl->handshake->certificate_request_sent = 1; |
XiaokangQian | 189ded2 | 2022-05-10 08:12:17 +0000 | [diff] [blame] | 2187 | |
XiaokangQian | a987e1d | 2022-05-07 01:25:58 +0000 | [diff] [blame] | 2188 | return( SSL_CERTIFICATE_REQUEST_SEND_REQUEST ); |
| 2189 | } |
| 2190 | |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2191 | /* |
| 2192 | * struct { |
| 2193 | * opaque certificate_request_context<0..2^8-1>; |
| 2194 | * Extension extensions<2..2^16-1>; |
| 2195 | * } CertificateRequest; |
| 2196 | * |
| 2197 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2198 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2199 | static int ssl_tls13_write_certificate_request_body( mbedtls_ssl_context *ssl, |
| 2200 | unsigned char *buf, |
| 2201 | const unsigned char *end, |
| 2202 | size_t *out_len ) |
| 2203 | { |
| 2204 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2205 | unsigned char *p = buf; |
XiaokangQian | ec6efb9 | 2022-05-06 09:53:10 +0000 | [diff] [blame] | 2206 | size_t output_len = 0; |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2207 | unsigned char *p_extensions_len; |
| 2208 | |
| 2209 | *out_len = 0; |
| 2210 | |
| 2211 | /* Check if we have enough space: |
| 2212 | * - certificate_request_context (1 byte) |
| 2213 | * - extensions length (2 bytes) |
| 2214 | */ |
| 2215 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 3 ); |
| 2216 | |
| 2217 | /* |
| 2218 | * Write certificate_request_context |
| 2219 | */ |
| 2220 | /* |
| 2221 | * We use a zero length context for the normal handshake |
| 2222 | * messages. For post-authentication handshake messages |
| 2223 | * this request context would be set to a non-zero value. |
| 2224 | */ |
| 2225 | *p++ = 0x0; |
| 2226 | |
| 2227 | /* |
| 2228 | * Write extensions |
| 2229 | */ |
| 2230 | /* The extensions must contain the signature_algorithms. */ |
| 2231 | p_extensions_len = p; |
| 2232 | p += 2; |
XiaokangQian | ec6efb9 | 2022-05-06 09:53:10 +0000 | [diff] [blame] | 2233 | ret = mbedtls_ssl_write_sig_alg_ext( ssl, p, end, &output_len ); |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2234 | if( ret != 0 ) |
| 2235 | return( ret ); |
| 2236 | |
XiaokangQian | ec6efb9 | 2022-05-06 09:53:10 +0000 | [diff] [blame] | 2237 | p += output_len; |
XiaokangQian | aad9b0a | 2022-05-09 01:11:21 +0000 | [diff] [blame] | 2238 | MBEDTLS_PUT_UINT16_BE( p - p_extensions_len - 2, p_extensions_len, 0 ); |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2239 | |
| 2240 | *out_len = p - buf; |
| 2241 | |
| 2242 | return( 0 ); |
| 2243 | } |
| 2244 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2245 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2246 | static int ssl_tls13_write_certificate_request( mbedtls_ssl_context *ssl ) |
| 2247 | { |
| 2248 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2249 | |
| 2250 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) ); |
| 2251 | |
| 2252 | MBEDTLS_SSL_PROC_CHK_NEG( ssl_tls13_certificate_request_coordinate( ssl ) ); |
| 2253 | |
| 2254 | if( ret == SSL_CERTIFICATE_REQUEST_SEND_REQUEST ) |
| 2255 | { |
| 2256 | unsigned char *buf; |
| 2257 | size_t buf_len, msg_len; |
| 2258 | |
| 2259 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_start_handshake_msg( ssl, |
| 2260 | MBEDTLS_SSL_HS_CERTIFICATE_REQUEST, &buf, &buf_len ) ); |
| 2261 | |
| 2262 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_certificate_request_body( |
| 2263 | ssl, buf, buf + buf_len, &msg_len ) ); |
| 2264 | |
| 2265 | mbedtls_ssl_add_hs_msg_to_checksum( |
| 2266 | ssl, MBEDTLS_SSL_HS_CERTIFICATE_REQUEST, buf, msg_len ); |
| 2267 | |
| 2268 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_finish_handshake_msg( |
| 2269 | ssl, buf_len, msg_len ) ); |
| 2270 | } |
| 2271 | else if( ret == SSL_CERTIFICATE_REQUEST_SKIP ) |
| 2272 | { |
| 2273 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) ); |
| 2274 | ret = 0; |
| 2275 | } |
| 2276 | else |
| 2277 | { |
| 2278 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| 2279 | ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; |
| 2280 | goto cleanup; |
| 2281 | } |
| 2282 | |
| 2283 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_SERVER_CERTIFICATE ); |
| 2284 | cleanup: |
| 2285 | |
| 2286 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) ); |
| 2287 | return( ret ); |
| 2288 | } |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2289 | |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2290 | /* |
Jerry Yu | c6e6dbf | 2022-04-16 19:42:57 +0800 | [diff] [blame] | 2291 | * Handler for MBEDTLS_SSL_SERVER_CERTIFICATE |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2292 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2293 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | c6e6dbf | 2022-04-16 19:42:57 +0800 | [diff] [blame] | 2294 | static int ssl_tls13_write_server_certificate( mbedtls_ssl_context *ssl ) |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2295 | { |
Jerry Yu | 5a26f30 | 2022-05-10 20:46:40 +0800 | [diff] [blame] | 2296 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 2297 | |
| 2298 | #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| 2299 | if( ( ssl_tls13_pick_key_cert( ssl ) != 0 ) || |
| 2300 | mbedtls_ssl_own_cert( ssl ) == NULL ) |
Jerry Yu | 5a26f30 | 2022-05-10 20:46:40 +0800 | [diff] [blame] | 2301 | { |
Jerry Yu | b89125b | 2022-05-13 15:45:49 +0800 | [diff] [blame] | 2302 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "No certificate available." ) ); |
Jerry Yu | 5a26f30 | 2022-05-10 20:46:40 +0800 | [diff] [blame] | 2303 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE, |
| 2304 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE); |
Jerry Yu | f1c3c4e | 2022-05-10 11:36:35 +0800 | [diff] [blame] | 2305 | return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
Jerry Yu | 5a26f30 | 2022-05-10 20:46:40 +0800 | [diff] [blame] | 2306 | } |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 2307 | #endif /* MBEDTLS_X509_CRT_PARSE_C */ |
Jerry Yu | 5a26f30 | 2022-05-10 20:46:40 +0800 | [diff] [blame] | 2308 | |
Jerry Yu | f1c3c4e | 2022-05-10 11:36:35 +0800 | [diff] [blame] | 2309 | ret = mbedtls_ssl_tls13_write_certificate( ssl ); |
| 2310 | if( ret != 0 ) |
Jerry Yu | 1bff711 | 2022-04-16 14:29:11 +0800 | [diff] [blame] | 2311 | return( ret ); |
Jerry Yu | 1bff711 | 2022-04-16 14:29:11 +0800 | [diff] [blame] | 2312 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CERTIFICATE_VERIFY ); |
| 2313 | return( 0 ); |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2314 | } |
| 2315 | |
| 2316 | /* |
Jerry Yu | c6e6dbf | 2022-04-16 19:42:57 +0800 | [diff] [blame] | 2317 | * Handler for MBEDTLS_SSL_CERTIFICATE_VERIFY |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2318 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2319 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | c6e6dbf | 2022-04-16 19:42:57 +0800 | [diff] [blame] | 2320 | static int ssl_tls13_write_certificate_verify( mbedtls_ssl_context *ssl ) |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2321 | { |
Jerry Yu | 4ff9e14 | 2022-04-16 14:57:49 +0800 | [diff] [blame] | 2322 | int ret = mbedtls_ssl_tls13_write_certificate_verify( ssl ); |
Jerry Yu | f1c3c4e | 2022-05-10 11:36:35 +0800 | [diff] [blame] | 2323 | if( ret != 0 ) |
Jerry Yu | 4ff9e14 | 2022-04-16 14:57:49 +0800 | [diff] [blame] | 2324 | return( ret ); |
Jerry Yu | 4ff9e14 | 2022-04-16 14:57:49 +0800 | [diff] [blame] | 2325 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_SERVER_FINISHED ); |
| 2326 | return( 0 ); |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2327 | } |
Jerry Yu | 5a26f30 | 2022-05-10 20:46:40 +0800 | [diff] [blame] | 2328 | #endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2329 | |
| 2330 | /* |
Jerry Yu | d6e253d | 2022-05-18 13:59:24 +0800 | [diff] [blame] | 2331 | * Handler for MBEDTLS_SSL_SERVER_FINISHED |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2332 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2333 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 4d8567f | 2022-04-17 10:57:57 +0800 | [diff] [blame] | 2334 | static int ssl_tls13_write_server_finished( mbedtls_ssl_context *ssl ) |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2335 | { |
Jerry Yu | d6e253d | 2022-05-18 13:59:24 +0800 | [diff] [blame] | 2336 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 27bdc7c | 2022-04-16 13:33:27 +0800 | [diff] [blame] | 2337 | |
| 2338 | ret = mbedtls_ssl_tls13_write_finished_message( ssl ); |
| 2339 | if( ret != 0 ) |
| 2340 | return( ret ); |
| 2341 | |
Jerry Yu | e3d67cb | 2022-05-19 15:33:10 +0800 | [diff] [blame] | 2342 | ret = mbedtls_ssl_tls13_compute_application_transform( ssl ); |
| 2343 | if( ret != 0 ) |
| 2344 | { |
| 2345 | MBEDTLS_SSL_PEND_FATAL_ALERT( |
| 2346 | MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE, |
| 2347 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 2348 | return( ret ); |
| 2349 | } |
XiaokangQian | c3017f6 | 2022-05-13 05:55:41 +0000 | [diff] [blame] | 2350 | |
Ronald Cron | 63dc463 | 2022-05-31 14:41:53 +0200 | [diff] [blame] | 2351 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "Switch to handshake keys for inbound traffic" ) ); |
| 2352 | mbedtls_ssl_set_inbound_transform( ssl, ssl->handshake->transform_handshake ); |
XiaokangQian | 189ded2 | 2022-05-10 08:12:17 +0000 | [diff] [blame] | 2353 | |
Ronald Cron | 63dc463 | 2022-05-31 14:41:53 +0200 | [diff] [blame] | 2354 | if( ssl->handshake->certificate_request_sent ) |
| 2355 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CLIENT_CERTIFICATE ); |
XiaokangQian | 189ded2 | 2022-05-10 08:12:17 +0000 | [diff] [blame] | 2356 | else |
Ronald Cron | 1938588 | 2022-06-15 16:26:13 +0200 | [diff] [blame] | 2357 | { |
| 2358 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "skip parse certificate" ) ); |
| 2359 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "skip parse certificate verify" ) ); |
XiaokangQian | 189ded2 | 2022-05-10 08:12:17 +0000 | [diff] [blame] | 2360 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CLIENT_FINISHED ); |
Ronald Cron | 1938588 | 2022-06-15 16:26:13 +0200 | [diff] [blame] | 2361 | } |
Ronald Cron | 63dc463 | 2022-05-31 14:41:53 +0200 | [diff] [blame] | 2362 | |
Jerry Yu | 27bdc7c | 2022-04-16 13:33:27 +0800 | [diff] [blame] | 2363 | return( 0 ); |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2364 | } |
| 2365 | |
| 2366 | /* |
Jerry Yu | d6e253d | 2022-05-18 13:59:24 +0800 | [diff] [blame] | 2367 | * Handler for MBEDTLS_SSL_CLIENT_FINISHED |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2368 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2369 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 4d8567f | 2022-04-17 10:57:57 +0800 | [diff] [blame] | 2370 | static int ssl_tls13_process_client_finished( mbedtls_ssl_context *ssl ) |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2371 | { |
Jerry Yu | d6e253d | 2022-05-18 13:59:24 +0800 | [diff] [blame] | 2372 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2373 | |
Jerry Yu | ff22698 | 2022-04-16 16:52:57 +0800 | [diff] [blame] | 2374 | ret = mbedtls_ssl_tls13_process_finished_message( ssl ); |
| 2375 | if( ret != 0 ) |
| 2376 | return( ret ); |
| 2377 | |
Jerry Yu | e3d67cb | 2022-05-19 15:33:10 +0800 | [diff] [blame] | 2378 | ret = mbedtls_ssl_tls13_generate_resumption_master_secret( ssl ); |
| 2379 | if( ret != 0 ) |
| 2380 | { |
| 2381 | MBEDTLS_SSL_DEBUG_RET( 1, |
| 2382 | "mbedtls_ssl_tls13_generate_resumption_master_secret ", ret ); |
| 2383 | } |
| 2384 | |
Jerry Yu | 03ed50b | 2022-04-16 17:13:30 +0800 | [diff] [blame] | 2385 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_HANDSHAKE_WRAPUP ); |
Jerry Yu | ff22698 | 2022-04-16 16:52:57 +0800 | [diff] [blame] | 2386 | return( 0 ); |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2387 | } |
| 2388 | |
| 2389 | /* |
Jerry Yu | d6e253d | 2022-05-18 13:59:24 +0800 | [diff] [blame] | 2390 | * Handler for MBEDTLS_SSL_HANDSHAKE_WRAPUP |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2391 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2392 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 4d8567f | 2022-04-17 10:57:57 +0800 | [diff] [blame] | 2393 | static int ssl_tls13_handshake_wrapup( mbedtls_ssl_context *ssl ) |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2394 | { |
Jerry Yu | 03ed50b | 2022-04-16 17:13:30 +0800 | [diff] [blame] | 2395 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) ); |
| 2396 | |
Jerry Yu | 03ed50b | 2022-04-16 17:13:30 +0800 | [diff] [blame] | 2397 | mbedtls_ssl_tls13_handshake_wrapup( ssl ); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2398 | |
| 2399 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2400 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_NEW_SESSION_TICKET ); |
| 2401 | #else |
Jerry Yu | 03ed50b | 2022-04-16 17:13:30 +0800 | [diff] [blame] | 2402 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_HANDSHAKE_OVER ); |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2403 | #endif |
Jerry Yu | 03ed50b | 2022-04-16 17:13:30 +0800 | [diff] [blame] | 2404 | return( 0 ); |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2405 | } |
| 2406 | |
| 2407 | /* |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2408 | * Handler for MBEDTLS_SSL_NEW_SESSION_TICKET |
| 2409 | */ |
| 2410 | #define SSL_NEW_SESSION_TICKET_SKIP 0 |
| 2411 | #define SSL_NEW_SESSION_TICKET_WRITE 1 |
| 2412 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 2413 | static int ssl_tls13_write_new_session_ticket_coordinate( mbedtls_ssl_context *ssl ) |
| 2414 | { |
| 2415 | /* Check whether the use of session tickets is enabled */ |
| 2416 | if( ssl->conf->f_ticket_write == NULL ) |
| 2417 | { |
| 2418 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "new session ticket is not enabled" ) ); |
| 2419 | return( SSL_NEW_SESSION_TICKET_SKIP ); |
| 2420 | } |
| 2421 | |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2422 | return( SSL_NEW_SESSION_TICKET_WRITE ); |
| 2423 | } |
| 2424 | |
| 2425 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
| 2426 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 2427 | static int ssl_tls13_prepare_new_session_ticket( mbedtls_ssl_context *ssl, |
| 2428 | unsigned char *ticket_nonce, |
| 2429 | size_t ticket_nonce_size ) |
| 2430 | { |
| 2431 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2432 | mbedtls_ssl_session *session = ssl->session; |
| 2433 | mbedtls_ssl_ciphersuite_t *ciphersuite_info; |
| 2434 | psa_algorithm_t psa_hash_alg; |
| 2435 | int hash_length; |
| 2436 | |
| 2437 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> prepare NewSessionTicket msg" ) ); |
| 2438 | |
| 2439 | #if defined(MBEDTLS_HAVE_TIME) |
| 2440 | session->start = mbedtls_time( NULL ); |
| 2441 | #endif |
| 2442 | |
| 2443 | /* Generate ticket_age_add */ |
| 2444 | if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2445 | (unsigned char *) &session->ticket_age_add, |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2446 | sizeof( session->ticket_age_add ) ) != 0 ) ) |
| 2447 | { |
| 2448 | MBEDTLS_SSL_DEBUG_RET( 1, "generate_ticket_age_add", ret ); |
| 2449 | return( ret ); |
| 2450 | } |
| 2451 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket_age_add: %u", |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2452 | (unsigned int)session->ticket_age_add ) ); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2453 | |
| 2454 | /* Generate ticket_nonce */ |
| 2455 | ret = ssl->conf->f_rng( ssl->conf->p_rng, ticket_nonce, ticket_nonce_size ); |
| 2456 | if( ret != 0 ) |
| 2457 | { |
| 2458 | MBEDTLS_SSL_DEBUG_RET( 1, "generate_ticket_nonce", ret ); |
| 2459 | return( ret ); |
| 2460 | } |
| 2461 | MBEDTLS_SSL_DEBUG_BUF( 3, "ticket_nonce:", |
| 2462 | ticket_nonce, ticket_nonce_size ); |
| 2463 | |
| 2464 | ciphersuite_info = |
| 2465 | (mbedtls_ssl_ciphersuite_t *) ssl->handshake->ciphersuite_info; |
| 2466 | psa_hash_alg = mbedtls_psa_translate_md( ciphersuite_info->mac ); |
| 2467 | hash_length = PSA_HASH_LENGTH( psa_hash_alg ); |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2468 | if( hash_length == -1 || |
Jerry Yu | 6119715 | 2022-07-21 16:28:02 +0800 | [diff] [blame] | 2469 | (size_t)hash_length > sizeof( session->resumption_key ) ) |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2470 | { |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2471 | return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2472 | } |
| 2473 | |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2474 | /* In this code the psk key length equals the length of the hash */ |
| 2475 | session->resumption_key_len = hash_length; |
| 2476 | session->ciphersuite = ciphersuite_info->id; |
| 2477 | |
| 2478 | /* Compute resumption key |
| 2479 | * |
| 2480 | * HKDF-Expand-Label( resumption_master_secret, |
| 2481 | * "resumption", ticket_nonce, Hash.length ) |
| 2482 | */ |
| 2483 | ret = mbedtls_ssl_tls13_hkdf_expand_label( |
| 2484 | psa_hash_alg, |
| 2485 | session->app_secrets.resumption_master_secret, |
| 2486 | hash_length, |
| 2487 | MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( resumption ), |
| 2488 | ticket_nonce, |
| 2489 | ticket_nonce_size, |
| 2490 | session->resumption_key, |
| 2491 | hash_length ); |
| 2492 | |
| 2493 | if( ret != 0 ) |
| 2494 | { |
| 2495 | MBEDTLS_SSL_DEBUG_RET( 2, |
| 2496 | "Creating the ticket-resumed PSK failed", |
| 2497 | ret ); |
| 2498 | return ( ret ); |
| 2499 | } |
| 2500 | MBEDTLS_SSL_DEBUG_BUF( 3, "Ticket-resumed PSK", |
| 2501 | session->resumption_key, |
| 2502 | session->resumption_key_len ); |
| 2503 | |
| 2504 | MBEDTLS_SSL_DEBUG_BUF( 3, "resumption_master_secret", |
| 2505 | session->app_secrets.resumption_master_secret, |
| 2506 | hash_length ); |
| 2507 | |
| 2508 | return( 0 ); |
| 2509 | } |
| 2510 | |
| 2511 | /* This function creates a NewSessionTicket message in the following format: |
| 2512 | * |
| 2513 | * struct { |
| 2514 | * uint32 ticket_lifetime; |
| 2515 | * uint32 ticket_age_add; |
| 2516 | * opaque ticket_nonce<0..255>; |
| 2517 | * opaque ticket<1..2^16-1>; |
| 2518 | * Extension extensions<0..2^16-2>; |
| 2519 | * } NewSessionTicket; |
| 2520 | * |
| 2521 | * The ticket inside the NewSessionTicket message is an encrypted container |
| 2522 | * carrying the necessary information so that the server is later able to |
| 2523 | * re-start the communication. |
| 2524 | * |
| 2525 | * The following fields are placed inside the ticket by the |
| 2526 | * f_ticket_write() function: |
| 2527 | * |
| 2528 | * - creation time (start) |
| 2529 | * - flags (flags) |
| 2530 | * - age add (ticket_age_add) |
| 2531 | * - key (key) |
| 2532 | * - key length (key_len) |
| 2533 | * - ciphersuite (ciphersuite) |
| 2534 | */ |
| 2535 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 2536 | static int ssl_tls13_write_new_session_ticket_body( mbedtls_ssl_context *ssl, |
| 2537 | unsigned char *buf, |
| 2538 | unsigned char *end, |
| 2539 | size_t *out_len, |
| 2540 | unsigned char *ticket_nonce, |
| 2541 | size_t ticket_nonce_size ) |
| 2542 | { |
| 2543 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2544 | unsigned char *p = buf; |
| 2545 | mbedtls_ssl_session *session = ssl->session; |
| 2546 | size_t ticket_len; |
| 2547 | uint32_t ticket_lifetime; |
| 2548 | |
| 2549 | *out_len = 0; |
| 2550 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write NewSessionTicket msg" ) ); |
| 2551 | |
| 2552 | /* |
| 2553 | * ticket_lifetime 4 bytes |
| 2554 | * ticket_age_add 4 bytes |
| 2555 | * ticket_nonce 1 + ticket_nonce_size bytes |
| 2556 | * ticket >=2 bytes |
| 2557 | */ |
| 2558 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 + 4 + 1 + ticket_nonce_size + 2 ); |
| 2559 | |
| 2560 | /* Generate ticket and ticket_lifetime */ |
| 2561 | ret = ssl->conf->f_ticket_write( ssl->conf->p_ticket, |
| 2562 | session, |
| 2563 | p + 9 + ticket_nonce_size + 2, |
| 2564 | end, |
| 2565 | &ticket_len, |
| 2566 | &ticket_lifetime); |
| 2567 | if( ret != 0 ) |
| 2568 | { |
| 2569 | MBEDTLS_SSL_DEBUG_RET( 1, "write_ticket", ret ); |
| 2570 | return( ret ); |
| 2571 | } |
| 2572 | /* RFC 8446 4.6.1 |
| 2573 | * ticket_lifetime: Indicates the lifetime in seconds as a 32-bit |
| 2574 | * unsigned integer in network byte order from the time of ticket |
| 2575 | * issuance. Servers MUST NOT use any value greater than |
| 2576 | * 604800 seconds (7 days). The value of zero indicates that the |
| 2577 | * ticket should be discarded immediately. Clients MUST NOT cache |
| 2578 | * tickets for longer than 7 days, regardless of the ticket_lifetime, |
| 2579 | * and MAY delete tickets earlier based on local policy. A server |
| 2580 | * MAY treat a ticket as valid for a shorter period of time than what |
| 2581 | * is stated in the ticket_lifetime. |
| 2582 | */ |
| 2583 | ticket_lifetime %= 604800; |
| 2584 | MBEDTLS_PUT_UINT32_BE( ticket_lifetime, p, 0 ); |
| 2585 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket_lifetime: %u", |
| 2586 | ( unsigned int )ticket_lifetime ) ); |
| 2587 | |
| 2588 | /* Write ticket_age_add */ |
| 2589 | MBEDTLS_PUT_UINT32_BE( session->ticket_age_add, p, 4 ); |
| 2590 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket_age_add: %u", |
| 2591 | ( unsigned int )session->ticket_age_add ) ); |
| 2592 | |
| 2593 | /* Write ticket_nonce */ |
| 2594 | p[8] = ( unsigned char )ticket_nonce_size; |
| 2595 | if( ticket_nonce_size > 0 ) |
| 2596 | { |
| 2597 | memcpy( p + 9, ticket_nonce, ticket_nonce_size ); |
| 2598 | } |
| 2599 | p += 9 + ticket_nonce_size; |
| 2600 | |
| 2601 | /* Write ticket */ |
| 2602 | MBEDTLS_PUT_UINT16_BE( ticket_len, p, 0 ); |
| 2603 | p += 2; |
| 2604 | MBEDTLS_SSL_DEBUG_BUF( 4, "ticket", p, ticket_len); |
| 2605 | p += ticket_len; |
| 2606 | |
| 2607 | /* Ticket Extensions |
| 2608 | * |
| 2609 | * Note: We currently don't have any extensions. |
| 2610 | * Set length to zero. |
| 2611 | */ |
| 2612 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 ); |
| 2613 | MBEDTLS_PUT_UINT16_BE( 0, p, 0 ); |
| 2614 | p += 2; |
| 2615 | |
| 2616 | *out_len = p - buf; |
| 2617 | MBEDTLS_SSL_DEBUG_BUF( 4, "ticket", buf, *out_len ); |
| 2618 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write new session ticket" ) ); |
| 2619 | |
| 2620 | return( 0 ); |
| 2621 | } |
| 2622 | |
| 2623 | /* |
| 2624 | * Handler for MBEDTLS_SSL_NEW_SESSION_TICKET |
| 2625 | */ |
| 2626 | static int ssl_tls13_write_new_session_ticket( mbedtls_ssl_context *ssl ) |
| 2627 | { |
| 2628 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2629 | |
| 2630 | MBEDTLS_SSL_PROC_CHK_NEG( ssl_tls13_write_new_session_ticket_coordinate( ssl ) ); |
| 2631 | |
| 2632 | if( ret == SSL_NEW_SESSION_TICKET_WRITE ) |
| 2633 | { |
| 2634 | unsigned char ticket_nonce[MBEDTLS_SSL_TLS1_3_TICKET_NONCE_LENGTH]; |
| 2635 | unsigned char *buf; |
| 2636 | size_t buf_len, msg_len; |
| 2637 | |
| 2638 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_prepare_new_session_ticket( |
| 2639 | ssl, ticket_nonce, sizeof( ticket_nonce ) ) ); |
| 2640 | |
| 2641 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_start_handshake_msg( ssl, |
| 2642 | MBEDTLS_SSL_HS_NEW_SESSION_TICKET, &buf, &buf_len ) ); |
| 2643 | |
| 2644 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_new_session_ticket_body( |
| 2645 | ssl, buf, buf + buf_len, &msg_len, |
| 2646 | ticket_nonce, sizeof( ticket_nonce ) ) ); |
| 2647 | |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2648 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_finish_handshake_msg( |
| 2649 | ssl, buf_len, msg_len ) ); |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2650 | |
| 2651 | mbedtls_ssl_handshake_set_state( ssl, |
| 2652 | MBEDTLS_SSL_NEW_SESSION_TICKET_FLUSH ); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2653 | } |
| 2654 | else |
| 2655 | { |
| 2656 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_HANDSHAKE_OVER ); |
| 2657 | } |
| 2658 | |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2659 | cleanup: |
| 2660 | |
| 2661 | return( ret ); |
| 2662 | } |
| 2663 | #endif /* MBEDTLS_SSL_SESSION_TICKETS */ |
| 2664 | |
| 2665 | /* |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 2666 | * TLS 1.3 State Machine -- server side |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2667 | */ |
Jerry Yu | 2756193 | 2021-08-27 17:07:38 +0800 | [diff] [blame] | 2668 | int mbedtls_ssl_tls13_handshake_server_step( mbedtls_ssl_context *ssl ) |
Jerry Yu | b9930e7 | 2021-08-06 17:11:51 +0800 | [diff] [blame] | 2669 | { |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 2670 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2671 | |
| 2672 | if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER || ssl->handshake == NULL ) |
| 2673 | return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| 2674 | |
Jerry Yu | e3b3412 | 2021-09-28 17:53:35 +0800 | [diff] [blame] | 2675 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "tls13 server state: %s(%d)", |
| 2676 | mbedtls_ssl_states_str( ssl->state ), |
| 2677 | ssl->state ) ); |
Jerry Yu | 6e81b27 | 2021-09-27 11:16:17 +0800 | [diff] [blame] | 2678 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2679 | switch( ssl->state ) |
| 2680 | { |
| 2681 | /* start state */ |
| 2682 | case MBEDTLS_SSL_HELLO_REQUEST: |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2683 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CLIENT_HELLO ); |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 2684 | ret = 0; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2685 | break; |
| 2686 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2687 | case MBEDTLS_SSL_CLIENT_HELLO: |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 2688 | ret = ssl_tls13_process_client_hello( ssl ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2689 | if( ret != 0 ) |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 2690 | MBEDTLS_SSL_DEBUG_RET( 1, "ssl_tls13_process_client_hello", ret ); |
Jerry Yu | f41553b | 2022-05-09 22:20:30 +0800 | [diff] [blame] | 2691 | break; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2692 | |
Jerry Yu | f41553b | 2022-05-09 22:20:30 +0800 | [diff] [blame] | 2693 | case MBEDTLS_SSL_HELLO_RETRY_REQUEST: |
| 2694 | ret = ssl_tls13_write_hello_retry_request( ssl ); |
| 2695 | if( ret != 0 ) |
| 2696 | { |
| 2697 | MBEDTLS_SSL_DEBUG_RET( 1, "ssl_tls13_write_hello_retry_request", ret ); |
| 2698 | return( ret ); |
| 2699 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2700 | break; |
| 2701 | |
Jerry Yu | 5b64ae9 | 2022-03-30 17:15:02 +0800 | [diff] [blame] | 2702 | case MBEDTLS_SSL_SERVER_HELLO: |
| 2703 | ret = ssl_tls13_write_server_hello( ssl ); |
| 2704 | break; |
| 2705 | |
Xiaofei Bai | cba64af | 2022-02-15 10:00:56 +0000 | [diff] [blame] | 2706 | case MBEDTLS_SSL_ENCRYPTED_EXTENSIONS: |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2707 | ret = ssl_tls13_write_encrypted_extensions( ssl ); |
Xiaofei Bai | cba64af | 2022-02-15 10:00:56 +0000 | [diff] [blame] | 2708 | if( ret != 0 ) |
| 2709 | { |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2710 | MBEDTLS_SSL_DEBUG_RET( 1, "ssl_tls13_write_encrypted_extensions", ret ); |
| 2711 | return( ret ); |
Xiaofei Bai | cba64af | 2022-02-15 10:00:56 +0000 | [diff] [blame] | 2712 | } |
Jerry Yu | 4833056 | 2022-05-06 21:35:44 +0800 | [diff] [blame] | 2713 | break; |
Jerry Yu | 6a2cd9e | 2022-05-05 11:14:19 +0800 | [diff] [blame] | 2714 | |
Xiaofei Bai | 9ca09d4 | 2022-02-14 12:57:18 +0000 | [diff] [blame] | 2715 | #if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) |
| 2716 | case MBEDTLS_SSL_CERTIFICATE_REQUEST: |
Xiaofei Bai | 5ee73d8 | 2022-03-14 02:48:30 +0000 | [diff] [blame] | 2717 | ret = ssl_tls13_write_certificate_request( ssl ); |
Xiaofei Bai | 9ca09d4 | 2022-02-14 12:57:18 +0000 | [diff] [blame] | 2718 | break; |
Xiaofei Bai | 9ca09d4 | 2022-02-14 12:57:18 +0000 | [diff] [blame] | 2719 | |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2720 | case MBEDTLS_SSL_SERVER_CERTIFICATE: |
| 2721 | ret = ssl_tls13_write_server_certificate( ssl ); |
| 2722 | break; |
| 2723 | |
| 2724 | case MBEDTLS_SSL_CERTIFICATE_VERIFY: |
| 2725 | ret = ssl_tls13_write_certificate_verify( ssl ); |
| 2726 | break; |
Jerry Yu | 5a26f30 | 2022-05-10 20:46:40 +0800 | [diff] [blame] | 2727 | #endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2728 | |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 2729 | /* |
| 2730 | * Injection of dummy-CCS's for middlebox compatibility |
| 2731 | */ |
| 2732 | #if defined(MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE) |
Gabor Mezei | f7044ea | 2022-06-28 16:01:49 +0200 | [diff] [blame] | 2733 | case MBEDTLS_SSL_SERVER_CCS_AFTER_HELLO_RETRY_REQUEST: |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 2734 | ret = mbedtls_ssl_tls13_write_change_cipher_spec( ssl ); |
| 2735 | if( ret == 0 ) |
| 2736 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CLIENT_HELLO ); |
| 2737 | break; |
| 2738 | |
| 2739 | case MBEDTLS_SSL_SERVER_CCS_AFTER_SERVER_HELLO: |
| 2740 | ret = mbedtls_ssl_tls13_write_change_cipher_spec( ssl ); |
| 2741 | if( ret == 0 ) |
| 2742 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_ENCRYPTED_EXTENSIONS ); |
| 2743 | break; |
| 2744 | #endif /* MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE */ |
| 2745 | |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2746 | case MBEDTLS_SSL_SERVER_FINISHED: |
| 2747 | ret = ssl_tls13_write_server_finished( ssl ); |
| 2748 | break; |
| 2749 | |
| 2750 | case MBEDTLS_SSL_CLIENT_FINISHED: |
| 2751 | ret = ssl_tls13_process_client_finished( ssl ); |
| 2752 | break; |
| 2753 | |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2754 | case MBEDTLS_SSL_HANDSHAKE_WRAPUP: |
| 2755 | ret = ssl_tls13_handshake_wrapup( ssl ); |
| 2756 | break; |
| 2757 | |
XiaokangQian | 6b916b1 | 2022-04-25 07:29:34 +0000 | [diff] [blame] | 2758 | case MBEDTLS_SSL_CLIENT_CERTIFICATE: |
| 2759 | ret = mbedtls_ssl_tls13_process_certificate( ssl ); |
Ronald Cron | 209cae9 | 2022-06-07 10:30:19 +0200 | [diff] [blame] | 2760 | if( ret == 0 ) |
XiaokangQian | 6b916b1 | 2022-04-25 07:29:34 +0000 | [diff] [blame] | 2761 | { |
Ronald Cron | 209cae9 | 2022-06-07 10:30:19 +0200 | [diff] [blame] | 2762 | if( ssl->session_negotiate->peer_cert != NULL ) |
| 2763 | { |
| 2764 | mbedtls_ssl_handshake_set_state( |
| 2765 | ssl, MBEDTLS_SSL_CLIENT_CERTIFICATE_VERIFY ); |
| 2766 | } |
| 2767 | else |
Ronald Cron | 1938588 | 2022-06-15 16:26:13 +0200 | [diff] [blame] | 2768 | { |
| 2769 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "skip parse certificate verify" ) ); |
Ronald Cron | 209cae9 | 2022-06-07 10:30:19 +0200 | [diff] [blame] | 2770 | mbedtls_ssl_handshake_set_state( |
| 2771 | ssl, MBEDTLS_SSL_CLIENT_FINISHED ); |
Ronald Cron | 1938588 | 2022-06-15 16:26:13 +0200 | [diff] [blame] | 2772 | } |
XiaokangQian | 6b916b1 | 2022-04-25 07:29:34 +0000 | [diff] [blame] | 2773 | } |
| 2774 | break; |
| 2775 | |
| 2776 | case MBEDTLS_SSL_CLIENT_CERTIFICATE_VERIFY: |
| 2777 | ret = mbedtls_ssl_tls13_process_certificate_verify( ssl ); |
| 2778 | if( ret == 0 ) |
| 2779 | { |
| 2780 | mbedtls_ssl_handshake_set_state( |
| 2781 | ssl, MBEDTLS_SSL_CLIENT_FINISHED ); |
| 2782 | } |
| 2783 | break; |
| 2784 | |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2785 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
| 2786 | case MBEDTLS_SSL_NEW_SESSION_TICKET: |
| 2787 | ret = ssl_tls13_write_new_session_ticket( ssl ); |
| 2788 | if( ret != 0 ) |
| 2789 | { |
| 2790 | MBEDTLS_SSL_DEBUG_RET( 1, |
| 2791 | "ssl_tls13_write_new_session_ticket ", |
| 2792 | ret ); |
| 2793 | } |
| 2794 | break; |
| 2795 | case MBEDTLS_SSL_NEW_SESSION_TICKET_FLUSH: |
| 2796 | /* This state is necessary to do the flush of the New Session |
| 2797 | * Ticket message written in MBEDTLS_SSL_NEW_SESSION_TICKET |
| 2798 | * as part of ssl_prepare_handshake_step. |
| 2799 | */ |
| 2800 | ret = 0; |
| 2801 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_HANDSHAKE_OVER ); |
| 2802 | break; |
| 2803 | |
| 2804 | #endif /* MBEDTLS_SSL_SESSION_TICKETS */ |
| 2805 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2806 | default: |
| 2807 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) ); |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 2808 | return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2809 | } |
| 2810 | |
| 2811 | return( ret ); |
Jerry Yu | b9930e7 | 2021-08-06 17:11:51 +0800 | [diff] [blame] | 2812 | } |
Jerry Yu | 3cc4c2a | 2021-08-06 16:29:08 +0800 | [diff] [blame] | 2813 | |
Jerry Yu | fb4b647 | 2022-01-27 15:03:26 +0800 | [diff] [blame] | 2814 | #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_PROTO_TLS1_3 */ |