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 | #include "mbedtls/platform.h" |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 38 | |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 39 | #include "ssl_misc.h" |
| 40 | #include "ssl_tls13_keys.h" |
| 41 | #include "ssl_debug_helpers.h" |
| 42 | |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 43 | |
Jerry Yu | c5a23a0 | 2022-08-25 10:51:44 +0800 | [diff] [blame] | 44 | static const mbedtls_ssl_ciphersuite_t *ssl_tls13_validate_peer_ciphersuite( |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 45 | mbedtls_ssl_context *ssl, |
Jerry Yu | c5a23a0 | 2022-08-25 10:51:44 +0800 | [diff] [blame] | 46 | unsigned int cipher_suite ) |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 47 | { |
| 48 | const mbedtls_ssl_ciphersuite_t *ciphersuite_info; |
| 49 | if( ! mbedtls_ssl_tls13_cipher_suite_is_offered( ssl, cipher_suite ) ) |
| 50 | return( NULL ); |
| 51 | |
| 52 | ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( cipher_suite ); |
| 53 | if( ( mbedtls_ssl_validate_ciphersuite( ssl, ciphersuite_info, |
| 54 | ssl->tls_version, |
| 55 | ssl->tls_version ) != 0 ) ) |
| 56 | { |
| 57 | return( NULL ); |
| 58 | } |
| 59 | return( ciphersuite_info ); |
| 60 | } |
| 61 | |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 62 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 63 | /* From RFC 8446: |
| 64 | * |
| 65 | * enum { psk_ke(0), psk_dhe_ke(1), (255) } PskKeyExchangeMode; |
| 66 | * struct { |
| 67 | * PskKeyExchangeMode ke_modes<1..255>; |
| 68 | * } PskKeyExchangeModes; |
| 69 | */ |
Jerry Yu | 6e74a7e | 2022-07-20 20:49:32 +0800 | [diff] [blame] | 70 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 71 | static int ssl_tls13_parse_key_exchange_modes_ext( mbedtls_ssl_context *ssl, |
| 72 | const unsigned char *buf, |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 73 | const unsigned char *end ) |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 74 | { |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 75 | const unsigned char *p = buf; |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 76 | size_t ke_modes_len; |
| 77 | int ke_modes = 0; |
| 78 | |
Jerry Yu | 854dd9e | 2022-07-15 14:28:27 +0800 | [diff] [blame] | 79 | /* Read ke_modes length (1 Byte) */ |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 80 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 1 ); |
| 81 | ke_modes_len = *p++; |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 82 | /* Currently, there are only two PSK modes, so even without looking |
| 83 | * at the content, something's wrong if the list has more than 2 items. */ |
| 84 | if( ke_modes_len > 2 ) |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 85 | { |
| 86 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER, |
| 87 | MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER ); |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 88 | return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 89 | } |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 90 | |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 91 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, ke_modes_len ); |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 92 | |
| 93 | while( ke_modes_len-- != 0 ) |
| 94 | { |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 95 | switch( *p++ ) |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 96 | { |
| 97 | case MBEDTLS_SSL_TLS1_3_PSK_MODE_PURE: |
| 98 | ke_modes |= MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK; |
| 99 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "Found PSK KEX MODE" ) ); |
| 100 | break; |
| 101 | case MBEDTLS_SSL_TLS1_3_PSK_MODE_ECDHE: |
| 102 | ke_modes |= MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL; |
| 103 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "Found PSK_EPHEMERAL KEX MODE" ) ); |
| 104 | break; |
| 105 | default: |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 106 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER, |
| 107 | MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER ); |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 108 | return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER ); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | ssl->handshake->tls13_kex_modes = ke_modes; |
| 113 | return( 0 ); |
| 114 | } |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 115 | |
Jerry Yu | e9d4fc0 | 2022-08-20 19:21:15 +0800 | [diff] [blame] | 116 | #define SSL_TLS1_3_OFFERED_PSK_NOT_MATCH 1 |
| 117 | #define SSL_TLS1_3_OFFERED_PSK_MATCH 0 |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 118 | |
| 119 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
| 120 | |
| 121 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 122 | static int ssl_tls13_offered_psks_check_identity_match_ticket( |
| 123 | mbedtls_ssl_context *ssl, |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 124 | const unsigned char *identity, |
| 125 | size_t identity_len, |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 126 | uint32_t obfuscated_ticket_age, |
| 127 | mbedtls_ssl_session *session ) |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 128 | { |
Jerry Yu | fd310eb | 2022-09-06 09:16:35 +0800 | [diff] [blame] | 129 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 130 | unsigned char *ticket_buffer; |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 131 | #if defined(MBEDTLS_HAVE_TIME) |
| 132 | mbedtls_time_t now; |
Jerry Yu | acff823 | 2022-09-14 14:35:11 +0800 | [diff] [blame] | 133 | uint64_t age_in_s; |
Jerry Yu | f7dad3c | 2022-09-14 22:31:39 +0800 | [diff] [blame] | 134 | int64_t age_diff_in_ms; |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 135 | #endif |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 136 | |
| 137 | ((void) obfuscated_ticket_age); |
| 138 | |
| 139 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> check_identity_match_ticket" ) ); |
| 140 | |
Jerry Yu | fd310eb | 2022-09-06 09:16:35 +0800 | [diff] [blame] | 141 | /* Ticket parser is not configured, Skip */ |
| 142 | if( ssl->conf->f_ticket_parse == NULL || identity_len == 0 ) |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 143 | return( 0 ); |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 144 | |
Jerry Yu | 4746b10 | 2022-09-13 11:11:48 +0800 | [diff] [blame] | 145 | /* We create a copy of the encrypted ticket since the ticket parsing |
| 146 | * function is allowed to use its input buffer as an output buffer |
| 147 | * (in-place decryption). We do, however, need the original buffer for |
| 148 | * computing the PSK binder value. |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 149 | */ |
| 150 | ticket_buffer = mbedtls_calloc( 1, identity_len ); |
| 151 | if( ticket_buffer == NULL ) |
| 152 | { |
| 153 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); |
| 154 | return ( MBEDTLS_ERR_SSL_ALLOC_FAILED ); |
| 155 | } |
| 156 | memcpy( ticket_buffer, identity, identity_len ); |
| 157 | |
| 158 | if( ( ret = ssl->conf->f_ticket_parse( ssl->conf->p_ticket, |
| 159 | session, |
| 160 | ticket_buffer, identity_len ) ) != 0 ) |
| 161 | { |
| 162 | if( ret == MBEDTLS_ERR_SSL_INVALID_MAC ) |
| 163 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is not authentic" ) ); |
| 164 | else if( ret == MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED ) |
| 165 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is expired" ) ); |
| 166 | else |
| 167 | MBEDTLS_SSL_DEBUG_RET( 1, "ticket_parse", ret ); |
| 168 | } |
| 169 | |
| 170 | /* We delete the temporary buffer */ |
| 171 | mbedtls_free( ticket_buffer ); |
| 172 | |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 173 | if( ret != 0 ) |
| 174 | goto exit; |
| 175 | |
| 176 | ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED; |
| 177 | #if defined(MBEDTLS_HAVE_TIME) |
| 178 | now = mbedtls_time( NULL ); |
| 179 | |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 180 | if( now < session->start ) |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 181 | { |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 182 | MBEDTLS_SSL_DEBUG_MSG( |
Jerry Yu | 03aa174 | 2022-10-10 21:48:37 +0800 | [diff] [blame] | 183 | 3, ( "Invalid ticket start time ( now=%" MBEDTLS_PRINTF_LONGLONG |
Jerry Yu | a99cbfa | 2022-10-08 11:17:14 +0800 | [diff] [blame] | 184 | ", start=%" MBEDTLS_PRINTF_LONGLONG " )", |
| 185 | (long long)now, (long long)session->start ) ); |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 186 | goto exit; |
| 187 | } |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 188 | |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 189 | age_in_s = (uint64_t)( now - session->start ); |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 190 | |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 191 | /* RFC 8446 section 4.6.1 |
| 192 | * |
| 193 | * Servers MUST NOT use any value greater than 604800 seconds (7 days). |
| 194 | * |
| 195 | * RFC 8446 section 4.2.11.1 |
| 196 | * |
| 197 | * Clients MUST NOT attempt to use tickets which have ages greater than |
| 198 | * the "ticket_lifetime" value which was provided with the ticket. |
| 199 | * |
| 200 | * For time being, the age MUST be less than 604800 seconds (7 days). |
| 201 | */ |
| 202 | if( age_in_s > 604800 ) |
| 203 | { |
| 204 | MBEDTLS_SSL_DEBUG_MSG( |
Jerry Yu | c2bfaf0 | 2022-10-11 15:55:52 +0800 | [diff] [blame] | 205 | 3, ( "Ticket age exceeds limitation ticket_age=%lu", |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 206 | (long unsigned int)age_in_s ) ); |
| 207 | goto exit; |
| 208 | } |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 209 | |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 210 | /* RFC 8446 section 4.2.10 |
| 211 | * |
| 212 | * For PSKs provisioned via NewSessionTicket, a server MUST validate that |
| 213 | * the ticket age for the selected PSK identity (computed by subtracting |
| 214 | * ticket_age_add from PskIdentity.obfuscated_ticket_age modulo 2^32) is |
| 215 | * within a small tolerance of the time since the ticket was issued. |
Jerry Yu | f7dad3c | 2022-09-14 22:31:39 +0800 | [diff] [blame] | 216 | * |
Jerry Yu | 0a55cc6 | 2022-09-15 16:15:06 +0800 | [diff] [blame] | 217 | * NOTE: When `now == session->start`, `age_diff_in_ms` may be negative |
| 218 | * as the age units are different on the server (s) and in the |
| 219 | * client (ms) side. Add a -1000 ms tolerance window to take this |
| 220 | * into account. |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 221 | */ |
Jerry Yu | f7dad3c | 2022-09-14 22:31:39 +0800 | [diff] [blame] | 222 | age_diff_in_ms = age_in_s * 1000; |
| 223 | age_diff_in_ms -= ( obfuscated_ticket_age - session->ticket_age_add ); |
| 224 | if( age_diff_in_ms <= -1000 || |
| 225 | age_diff_in_ms > MBEDTLS_SSL_TLS1_3_TICKET_AGE_TOLERANCE ) |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 226 | { |
| 227 | MBEDTLS_SSL_DEBUG_MSG( |
Jerry Yu | 03aa174 | 2022-10-10 21:48:37 +0800 | [diff] [blame] | 228 | 3, ( "Ticket age outside tolerance window ( diff=%d )", |
| 229 | (int)age_diff_in_ms ) ); |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 230 | goto exit; |
| 231 | } |
| 232 | |
| 233 | ret = 0; |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 234 | |
| 235 | #endif /* MBEDTLS_HAVE_TIME */ |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 236 | |
| 237 | exit: |
| 238 | if( ret != 0 ) |
| 239 | mbedtls_ssl_session_free( session ); |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 240 | |
| 241 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= check_identity_match_ticket" ) ); |
| 242 | return( ret ); |
| 243 | } |
| 244 | #endif /* MBEDTLS_SSL_SESSION_TICKETS */ |
| 245 | |
Jerry Yu | 6e74a7e | 2022-07-20 20:49:32 +0800 | [diff] [blame] | 246 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 247 | static int ssl_tls13_offered_psks_check_identity_match( |
| 248 | mbedtls_ssl_context *ssl, |
| 249 | const unsigned char *identity, |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 250 | size_t identity_len, |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 251 | uint32_t obfuscated_ticket_age, |
Jerry Yu | 4746b10 | 2022-09-13 11:11:48 +0800 | [diff] [blame] | 252 | int *psk_type, |
| 253 | mbedtls_ssl_session *session ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 254 | { |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 255 | ((void) session); |
| 256 | ((void) obfuscated_ticket_age); |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 257 | *psk_type = MBEDTLS_SSL_TLS1_3_PSK_EXTERNAL; |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 258 | |
| 259 | MBEDTLS_SSL_DEBUG_BUF( 4, "identity", identity, identity_len ); |
| 260 | ssl->handshake->resume = 0; |
| 261 | |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 262 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
| 263 | if( ssl_tls13_offered_psks_check_identity_match_ticket( |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 264 | ssl, identity, identity_len, obfuscated_ticket_age, |
Jerry Yu | f7dad3c | 2022-09-14 22:31:39 +0800 | [diff] [blame] | 265 | session ) == SSL_TLS1_3_OFFERED_PSK_MATCH ) |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 266 | { |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 267 | ssl->handshake->resume = 1; |
| 268 | *psk_type = MBEDTLS_SSL_TLS1_3_PSK_RESUMPTION; |
| 269 | mbedtls_ssl_set_hs_psk( ssl, |
Jerry Yu | 0a55cc6 | 2022-09-15 16:15:06 +0800 | [diff] [blame] | 270 | session->resumption_key, |
| 271 | session->resumption_key_len ); |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 272 | |
| 273 | MBEDTLS_SSL_DEBUG_BUF( 4, "Ticket-resumed PSK:", |
Jerry Yu | 0a55cc6 | 2022-09-15 16:15:06 +0800 | [diff] [blame] | 274 | session->resumption_key, |
| 275 | session->resumption_key_len ); |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 276 | MBEDTLS_SSL_DEBUG_MSG( 4, ( "ticket: obfuscated_ticket_age: %u", |
| 277 | (unsigned)obfuscated_ticket_age ) ); |
| 278 | return( SSL_TLS1_3_OFFERED_PSK_MATCH ); |
| 279 | } |
| 280 | #endif /* MBEDTLS_SSL_SESSION_TICKETS */ |
| 281 | |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 282 | /* Check identity with external configured function */ |
| 283 | if( ssl->conf->f_psk != NULL ) |
| 284 | { |
| 285 | if( ssl->conf->f_psk( |
| 286 | ssl->conf->p_psk, ssl, identity, identity_len ) == 0 ) |
| 287 | { |
| 288 | return( SSL_TLS1_3_OFFERED_PSK_MATCH ); |
| 289 | } |
| 290 | return( SSL_TLS1_3_OFFERED_PSK_NOT_MATCH ); |
| 291 | } |
| 292 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 293 | MBEDTLS_SSL_DEBUG_BUF( 5, "identity", identity, identity_len ); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 294 | /* Check identity with pre-configured psk */ |
Jerry Yu | 2f0abc9 | 2022-07-22 19:34:48 +0800 | [diff] [blame] | 295 | if( ssl->conf->psk_identity != NULL && |
| 296 | identity_len == ssl->conf->psk_identity_len && |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 297 | mbedtls_ct_memcmp( ssl->conf->psk_identity, |
| 298 | identity, identity_len ) == 0 ) |
| 299 | { |
| 300 | mbedtls_ssl_set_hs_psk( ssl, ssl->conf->psk, ssl->conf->psk_len ); |
| 301 | return( SSL_TLS1_3_OFFERED_PSK_MATCH ); |
| 302 | } |
| 303 | |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 304 | return( SSL_TLS1_3_OFFERED_PSK_NOT_MATCH ); |
| 305 | } |
| 306 | |
Jerry Yu | 6e74a7e | 2022-07-20 20:49:32 +0800 | [diff] [blame] | 307 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 308 | static int ssl_tls13_offered_psks_check_binder_match( mbedtls_ssl_context *ssl, |
| 309 | const unsigned char *binder, |
Jerry Yu | e95c8af | 2022-07-26 15:48:20 +0800 | [diff] [blame] | 310 | size_t binder_len, |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 311 | int psk_type, |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 312 | psa_algorithm_t psk_hash_alg ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 313 | { |
| 314 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 315 | |
Jerry Yu | daf375a | 2022-07-20 21:31:43 +0800 | [diff] [blame] | 316 | unsigned char transcript[PSA_HASH_MAX_SIZE]; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 317 | size_t transcript_len; |
Jerry Yu | 2f0abc9 | 2022-07-22 19:34:48 +0800 | [diff] [blame] | 318 | unsigned char *psk; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 319 | size_t psk_len; |
Jerry Yu | daf375a | 2022-07-20 21:31:43 +0800 | [diff] [blame] | 320 | unsigned char server_computed_binder[PSA_HASH_MAX_SIZE]; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 321 | |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 322 | /* Get current state of handshake transcript. */ |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 323 | ret = mbedtls_ssl_get_handshake_transcript( |
| 324 | ssl, mbedtls_hash_info_md_from_psa( psk_hash_alg ), |
| 325 | transcript, sizeof( transcript ), &transcript_len ); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 326 | if( ret != 0 ) |
| 327 | return( ret ); |
| 328 | |
Jerry Yu | 40f3771 | 2022-07-26 16:58:57 +0800 | [diff] [blame] | 329 | ret = mbedtls_ssl_tls13_export_handshake_psk( ssl, &psk, &psk_len ); |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 330 | if( ret != 0 ) |
| 331 | return( ret ); |
| 332 | |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 333 | ret = mbedtls_ssl_tls13_create_psk_binder( ssl, psk_hash_alg, |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 334 | psk, psk_len, psk_type, |
| 335 | transcript, |
| 336 | server_computed_binder ); |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 337 | #if defined(MBEDTLS_USE_PSA_CRYPTO) |
| 338 | mbedtls_free( (void*)psk ); |
| 339 | #endif |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 340 | if( ret != 0 ) |
| 341 | { |
| 342 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "PSK binder calculation failed." ) ); |
| 343 | return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 344 | } |
| 345 | |
| 346 | MBEDTLS_SSL_DEBUG_BUF( 3, "psk binder ( computed ): ", |
Jerry Yu | 2f0abc9 | 2022-07-22 19:34:48 +0800 | [diff] [blame] | 347 | server_computed_binder, transcript_len ); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 348 | MBEDTLS_SSL_DEBUG_BUF( 3, "psk binder ( received ): ", binder, binder_len ); |
| 349 | |
| 350 | if( mbedtls_ct_memcmp( server_computed_binder, binder, binder_len ) == 0 ) |
| 351 | { |
| 352 | return( SSL_TLS1_3_OFFERED_PSK_MATCH ); |
| 353 | } |
| 354 | |
Jerry Yu | daf375a | 2022-07-20 21:31:43 +0800 | [diff] [blame] | 355 | mbedtls_platform_zeroize( server_computed_binder, |
| 356 | sizeof( server_computed_binder ) ); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 357 | return( SSL_TLS1_3_OFFERED_PSK_NOT_MATCH ); |
| 358 | } |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 359 | |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 360 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 361 | static int ssl_tls13_select_ciphersuite_for_psk( |
| 362 | mbedtls_ssl_context *ssl, |
| 363 | const unsigned char *cipher_suites, |
| 364 | const unsigned char *cipher_suites_end, |
| 365 | uint16_t *selected_ciphersuite, |
| 366 | const mbedtls_ssl_ciphersuite_t **selected_ciphersuite_info ) |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 367 | { |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 368 | psa_algorithm_t psk_hash_alg = PSA_ALG_SHA_256; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 369 | |
Jerry Yu | 0baf907 | 2022-08-25 11:21:04 +0800 | [diff] [blame] | 370 | *selected_ciphersuite = 0; |
| 371 | *selected_ciphersuite_info = NULL; |
| 372 | |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 373 | /* RFC 8446, page 55. |
| 374 | * |
| 375 | * For externally established PSKs, the Hash algorithm MUST be set when the |
| 376 | * PSK is established or default to SHA-256 if no such algorithm is defined. |
| 377 | * |
| 378 | */ |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 379 | |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 380 | /* |
| 381 | * Search for a matching ciphersuite |
| 382 | */ |
Jerry Yu | 1e05b6d | 2022-08-31 10:35:52 +0800 | [diff] [blame] | 383 | for ( const unsigned char *p = cipher_suites; |
| 384 | p < cipher_suites_end; p += 2 ) |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 385 | { |
| 386 | uint16_t cipher_suite; |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 387 | const mbedtls_ssl_ciphersuite_t *ciphersuite_info; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 388 | |
| 389 | cipher_suite = MBEDTLS_GET_UINT16_BE( p, 0 ); |
Jerry Yu | c5a23a0 | 2022-08-25 10:51:44 +0800 | [diff] [blame] | 390 | ciphersuite_info = ssl_tls13_validate_peer_ciphersuite( ssl, |
| 391 | cipher_suite ); |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 392 | if( ciphersuite_info == NULL ) |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 393 | continue; |
| 394 | |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 395 | /* MAC of selected ciphersuite MUST be same with PSK binder if exist. |
| 396 | * Otherwise, client should reject. |
| 397 | */ |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 398 | if( psk_hash_alg == mbedtls_psa_translate_md( ciphersuite_info->mac ) ) |
| 399 | { |
| 400 | *selected_ciphersuite = cipher_suite; |
| 401 | *selected_ciphersuite_info = ciphersuite_info; |
| 402 | return( 0 ); |
| 403 | } |
| 404 | } |
| 405 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "No matched ciphersuite" ) ); |
| 406 | return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 407 | } |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 408 | |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 409 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 410 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 411 | static int ssl_tls13_select_ciphersuite_for_resumption( |
| 412 | mbedtls_ssl_context *ssl, |
| 413 | const unsigned char *cipher_suites, |
| 414 | const unsigned char *cipher_suites_end, |
| 415 | mbedtls_ssl_session *session, |
| 416 | uint16_t *selected_ciphersuite, |
| 417 | const mbedtls_ssl_ciphersuite_t **selected_ciphersuite_info ) |
| 418 | { |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 419 | |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 420 | *selected_ciphersuite = 0; |
| 421 | *selected_ciphersuite_info = NULL; |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 422 | for( const unsigned char *p = cipher_suites; p < cipher_suites_end; p += 2 ) |
| 423 | { |
| 424 | uint16_t cipher_suite = MBEDTLS_GET_UINT16_BE( p, 0 ); |
| 425 | const mbedtls_ssl_ciphersuite_t *ciphersuite_info; |
| 426 | |
| 427 | if( cipher_suite != session->ciphersuite ) |
| 428 | continue; |
| 429 | |
| 430 | ciphersuite_info = ssl_tls13_validate_peer_ciphersuite( ssl, |
| 431 | cipher_suite ); |
| 432 | if( ciphersuite_info == NULL ) |
| 433 | continue; |
| 434 | |
Jerry Yu | 4746b10 | 2022-09-13 11:11:48 +0800 | [diff] [blame] | 435 | *selected_ciphersuite = cipher_suite; |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 436 | *selected_ciphersuite_info = ciphersuite_info; |
| 437 | |
| 438 | return( 0 ); |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 439 | } |
| 440 | |
| 441 | return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 442 | } |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 443 | |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 444 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 4746b10 | 2022-09-13 11:11:48 +0800 | [diff] [blame] | 445 | static int ssl_tls13_session_copy_ticket( mbedtls_ssl_session *dst, |
| 446 | const mbedtls_ssl_session *src ) |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 447 | { |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 448 | dst->ticket_age_add = src->ticket_age_add; |
| 449 | dst->ticket_flags = src->ticket_flags; |
| 450 | dst->resumption_key_len = src->resumption_key_len; |
| 451 | if( src->resumption_key_len == 0 ) |
| 452 | return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| 453 | memcpy( dst->resumption_key, src->resumption_key, src->resumption_key_len ); |
Jerry Yu | 4746b10 | 2022-09-13 11:11:48 +0800 | [diff] [blame] | 454 | |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 455 | return( 0 ); |
| 456 | } |
| 457 | #endif /* MBEDTLS_SSL_SESSION_TICKETS */ |
| 458 | |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 459 | /* Parser for pre_shared_key extension in client hello |
| 460 | * struct { |
| 461 | * opaque identity<1..2^16-1>; |
| 462 | * uint32 obfuscated_ticket_age; |
| 463 | * } PskIdentity; |
| 464 | * |
| 465 | * opaque PskBinderEntry<32..255>; |
| 466 | * |
| 467 | * struct { |
| 468 | * PskIdentity identities<7..2^16-1>; |
| 469 | * PskBinderEntry binders<33..2^16-1>; |
| 470 | * } OfferedPsks; |
| 471 | * |
| 472 | * struct { |
| 473 | * select (Handshake.msg_type) { |
| 474 | * case client_hello: OfferedPsks; |
| 475 | * .... |
| 476 | * }; |
| 477 | * } PreSharedKeyExtension; |
| 478 | */ |
Jerry Yu | 6e74a7e | 2022-07-20 20:49:32 +0800 | [diff] [blame] | 479 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | bb85202 | 2022-07-20 21:10:44 +0800 | [diff] [blame] | 480 | 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] | 481 | const unsigned char *pre_shared_key_ext, |
| 482 | const unsigned char *pre_shared_key_ext_end, |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 483 | const unsigned char *ciphersuites, |
| 484 | const unsigned char *ciphersuites_end ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 485 | { |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 486 | const unsigned char *identities = pre_shared_key_ext; |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 487 | const unsigned char *p_identity_len; |
| 488 | size_t identities_len; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 489 | const unsigned char *identities_end; |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 490 | const unsigned char *binders; |
| 491 | const unsigned char *p_binder_len; |
| 492 | size_t binders_len; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 493 | const unsigned char *binders_end; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 494 | int matched_identity = -1; |
| 495 | int identity_id = -1; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 496 | |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 497 | MBEDTLS_SSL_DEBUG_BUF( 3, "pre_shared_key extension", |
| 498 | pre_shared_key_ext, |
| 499 | pre_shared_key_ext_end - pre_shared_key_ext ); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 500 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 501 | /* identities_len 2 bytes |
| 502 | * identities_data >= 7 bytes |
| 503 | */ |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 504 | 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] | 505 | identities_len = MBEDTLS_GET_UINT16_BE( identities, 0 ); |
| 506 | p_identity_len = identities + 2; |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 507 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p_identity_len, pre_shared_key_ext_end, |
| 508 | identities_len ); |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 509 | identities_end = p_identity_len + identities_len; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 510 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 511 | /* binders_len 2 bytes |
| 512 | * binders >= 33 bytes |
| 513 | */ |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 514 | binders = identities_end; |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 515 | 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] | 516 | binders_len = MBEDTLS_GET_UINT16_BE( binders, 0 ); |
| 517 | p_binder_len = binders + 2; |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 518 | 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] | 519 | binders_end = p_binder_len + binders_len; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 520 | |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 521 | ssl->handshake->update_checksum( ssl, pre_shared_key_ext, |
| 522 | identities_end - pre_shared_key_ext ); |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 523 | |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 524 | while( p_identity_len < identities_end && p_binder_len < binders_end ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 525 | { |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 526 | const unsigned char *identity; |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 527 | size_t identity_len; |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 528 | uint32_t obfuscated_ticket_age; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 529 | const unsigned char *binder; |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 530 | size_t binder_len; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 531 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 532 | int psk_type; |
| 533 | uint16_t cipher_suite; |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 534 | const mbedtls_ssl_ciphersuite_t *ciphersuite_info; |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 535 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
| 536 | mbedtls_ssl_session session; |
Jerry Yu | 4746b10 | 2022-09-13 11:11:48 +0800 | [diff] [blame] | 537 | mbedtls_ssl_session_init( &session ); |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 538 | #endif |
Jerry Yu | bb85202 | 2022-07-20 21:10:44 +0800 | [diff] [blame] | 539 | |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 540 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p_identity_len, identities_end, 2 + 1 + 4 ); |
| 541 | identity_len = MBEDTLS_GET_UINT16_BE( p_identity_len, 0 ); |
| 542 | identity = p_identity_len + 2; |
| 543 | MBEDTLS_SSL_CHK_BUF_READ_PTR( identity, identities_end, identity_len + 4 ); |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 544 | obfuscated_ticket_age = MBEDTLS_GET_UINT32_BE( identity , identity_len ); |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 545 | p_identity_len += identity_len + 6; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 546 | |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 547 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p_binder_len, binders_end, 1 + 32 ); |
| 548 | binder_len = *p_binder_len; |
| 549 | binder = p_binder_len + 1; |
| 550 | MBEDTLS_SSL_CHK_BUF_READ_PTR( binder, binders_end, binder_len ); |
| 551 | p_binder_len += binder_len + 1; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 552 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 553 | identity_id++; |
| 554 | if( matched_identity != -1 ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 555 | continue; |
| 556 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 557 | ret = ssl_tls13_offered_psks_check_identity_match( |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 558 | ssl, identity, identity_len, obfuscated_ticket_age, |
Jerry Yu | 4746b10 | 2022-09-13 11:11:48 +0800 | [diff] [blame] | 559 | &psk_type, &session ); |
Jerry Yu | e95c8af | 2022-07-26 15:48:20 +0800 | [diff] [blame] | 560 | if( ret != SSL_TLS1_3_OFFERED_PSK_MATCH ) |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 561 | continue; |
| 562 | |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 563 | MBEDTLS_SSL_DEBUG_MSG( 4, ( "found matched identity" ) ); |
Jerry Yu | 0baf907 | 2022-08-25 11:21:04 +0800 | [diff] [blame] | 564 | switch( psk_type ) |
| 565 | { |
| 566 | case MBEDTLS_SSL_TLS1_3_PSK_EXTERNAL: |
| 567 | ret = ssl_tls13_select_ciphersuite_for_psk( |
| 568 | ssl, ciphersuites, ciphersuites_end, |
| 569 | &cipher_suite, &ciphersuite_info ); |
| 570 | break; |
| 571 | case MBEDTLS_SSL_TLS1_3_PSK_RESUMPTION: |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 572 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
Jerry Yu | 0baf907 | 2022-08-25 11:21:04 +0800 | [diff] [blame] | 573 | ret = ssl_tls13_select_ciphersuite_for_resumption( |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 574 | ssl, ciphersuites, ciphersuites_end, &session, |
Jerry Yu | 0baf907 | 2022-08-25 11:21:04 +0800 | [diff] [blame] | 575 | &cipher_suite, &ciphersuite_info ); |
Jerry Yu | 4746b10 | 2022-09-13 11:11:48 +0800 | [diff] [blame] | 576 | if( ret != 0 ) |
| 577 | mbedtls_ssl_session_free( &session ); |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 578 | #else |
| 579 | ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; |
| 580 | #endif |
Jerry Yu | 0baf907 | 2022-08-25 11:21:04 +0800 | [diff] [blame] | 581 | break; |
| 582 | default: |
| 583 | return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| 584 | } |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 585 | if( ret != 0 ) |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 586 | { |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 587 | /* See below, no cipher_suite available, abort handshake */ |
| 588 | MBEDTLS_SSL_PEND_FATAL_ALERT( |
| 589 | MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR, |
| 590 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 591 | MBEDTLS_SSL_DEBUG_RET( |
Jerry Yu | 0baf907 | 2022-08-25 11:21:04 +0800 | [diff] [blame] | 592 | 2, "ssl_tls13_select_ciphersuite", ret ); |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 593 | return( ret ); |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 594 | } |
| 595 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 596 | ret = ssl_tls13_offered_psks_check_binder_match( |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 597 | ssl, binder, binder_len, psk_type, |
| 598 | mbedtls_psa_translate_md( ciphersuite_info->mac ) ); |
Jerry Yu | e9d4fc0 | 2022-08-20 19:21:15 +0800 | [diff] [blame] | 599 | if( ret != SSL_TLS1_3_OFFERED_PSK_MATCH ) |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 600 | { |
Jerry Yu | c5a23a0 | 2022-08-25 10:51:44 +0800 | [diff] [blame] | 601 | /* For security reasons, the handshake should be aborted when we |
| 602 | * fail to validate a binder value. See RFC 8446 section 4.2.11.2 |
| 603 | * and appendix E.6. */ |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 604 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
| 605 | mbedtls_ssl_session_free( &session ); |
| 606 | #endif |
Jerry Yu | c5a23a0 | 2022-08-25 10:51:44 +0800 | [diff] [blame] | 607 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "Invalid binder." ) ); |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 608 | MBEDTLS_SSL_DEBUG_RET( 1, |
| 609 | "ssl_tls13_offered_psks_check_binder_match" , ret ); |
| 610 | MBEDTLS_SSL_PEND_FATAL_ALERT( |
| 611 | MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR, |
| 612 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 613 | return( ret ); |
| 614 | } |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 615 | |
| 616 | matched_identity = identity_id; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 617 | |
| 618 | /* Update handshake parameters */ |
Jerry Yu | e5834fd | 2022-08-29 20:16:09 +0800 | [diff] [blame] | 619 | ssl->handshake->ciphersuite_info = ciphersuite_info; |
Jerry Yu | 4746b10 | 2022-09-13 11:11:48 +0800 | [diff] [blame] | 620 | ssl->session_negotiate->ciphersuite = cipher_suite; |
Jerry Yu | e5834fd | 2022-08-29 20:16:09 +0800 | [diff] [blame] | 621 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "overwrite ciphersuite: %04x - %s", |
| 622 | cipher_suite, ciphersuite_info->name ) ); |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 623 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 624 | if( psk_type == MBEDTLS_SSL_TLS1_3_PSK_RESUMPTION ) |
| 625 | { |
Jerry Yu | f7dad3c | 2022-09-14 22:31:39 +0800 | [diff] [blame] | 626 | ret = ssl_tls13_session_copy_ticket( ssl->session_negotiate, |
| 627 | &session ); |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 628 | mbedtls_ssl_session_free( &session ); |
| 629 | if( ret != 0 ) |
| 630 | return( ret ); |
| 631 | } |
| 632 | #endif /* MBEDTLS_SSL_SESSION_TICKETS */ |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 633 | } |
| 634 | |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 635 | if( p_identity_len != identities_end || p_binder_len != binders_end ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 636 | { |
| 637 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "pre_shared_key extesion decode error" ) ); |
| 638 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR, |
| 639 | MBEDTLS_ERR_SSL_DECODE_ERROR ); |
| 640 | return( MBEDTLS_ERR_SSL_DECODE_ERROR ); |
| 641 | } |
| 642 | |
Jerry Yu | 6f1db3f | 2022-07-22 23:05:59 +0800 | [diff] [blame] | 643 | /* Update the handshake transcript with the binder list. */ |
| 644 | ssl->handshake->update_checksum( ssl, |
| 645 | identities_end, |
| 646 | (size_t)( binders_end - identities_end ) ); |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 647 | if( matched_identity == -1 ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 648 | { |
Jerry Yu | e9d4fc0 | 2022-08-20 19:21:15 +0800 | [diff] [blame] | 649 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "No matched PSK or ticket." ) ); |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 650 | return( MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY ); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 651 | } |
| 652 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 653 | ssl->handshake->selected_identity = (uint16_t)matched_identity; |
| 654 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "Pre shared key found" ) ); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 655 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 656 | return( 0 ); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 657 | } |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 658 | |
| 659 | /* |
| 660 | * struct { |
| 661 | * select ( Handshake.msg_type ) { |
| 662 | * .... |
| 663 | * case server_hello: |
| 664 | * uint16 selected_identity; |
| 665 | * } |
| 666 | * } PreSharedKeyExtension; |
| 667 | */ |
Jerry Yu | bb85202 | 2022-07-20 21:10:44 +0800 | [diff] [blame] | 668 | static int ssl_tls13_write_server_pre_shared_key_ext( mbedtls_ssl_context *ssl, |
| 669 | unsigned char *buf, |
| 670 | unsigned char *end, |
| 671 | size_t *olen ) |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 672 | { |
| 673 | unsigned char *p = (unsigned char*)buf; |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 674 | |
| 675 | *olen = 0; |
| 676 | |
| 677 | #if defined(MBEDTLS_USE_PSA_CRYPTO) |
| 678 | if( mbedtls_svc_key_id_is_null( ssl->handshake->psk_opaque ) ) |
| 679 | #else |
| 680 | if( ssl->handshake->psk == NULL ) |
| 681 | #endif |
| 682 | { |
| 683 | /* We shouldn't have called this extension writer unless we've |
| 684 | * chosen to use a PSK. */ |
| 685 | return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| 686 | } |
| 687 | |
| 688 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding pre_shared_key extension" ) ); |
| 689 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 6 ); |
| 690 | |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 691 | MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_PRE_SHARED_KEY, p, 0 ); |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 692 | MBEDTLS_PUT_UINT16_BE( 2, p, 2 ); |
| 693 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 694 | MBEDTLS_PUT_UINT16_BE( ssl->handshake->selected_identity, p, 4 ); |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 695 | |
| 696 | *olen = 6; |
| 697 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 698 | MBEDTLS_SSL_DEBUG_MSG( 4, ( "sent selected_identity: %u", |
| 699 | ssl->handshake->selected_identity ) ); |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 700 | |
| 701 | return( 0 ); |
| 702 | } |
| 703 | |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 704 | #endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED */ |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 705 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 706 | /* From RFC 8446: |
| 707 | * struct { |
XiaokangQian | cfd925f | 2022-04-14 07:10:37 +0000 | [diff] [blame] | 708 | * ProtocolVersion versions<2..254>; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 709 | * } SupportedVersions; |
| 710 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 711 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 712 | static int ssl_tls13_parse_supported_versions_ext( mbedtls_ssl_context *ssl, |
| 713 | const unsigned char *buf, |
| 714 | const unsigned char *end ) |
| 715 | { |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 716 | const unsigned char *p = buf; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 717 | size_t versions_len; |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 718 | const unsigned char *versions_end; |
XiaokangQian | 0a1b54e | 2022-04-21 03:01:38 +0000 | [diff] [blame] | 719 | uint16_t tls_version; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 720 | int tls13_supported = 0; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 721 | |
| 722 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 1 ); |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 723 | versions_len = p[0]; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 724 | p += 1; |
| 725 | |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 726 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, versions_len ); |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 727 | versions_end = p + versions_len; |
| 728 | while( p < versions_end ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 729 | { |
XiaokangQian | cfd925f | 2022-04-14 07:10:37 +0000 | [diff] [blame] | 730 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, versions_end, 2 ); |
XiaokangQian | de33391 | 2022-04-20 08:49:42 +0000 | [diff] [blame] | 731 | tls_version = mbedtls_ssl_read_version( p, ssl->conf->transport ); |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 732 | p += 2; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 733 | |
| 734 | /* In this implementation we only support TLS 1.3 and DTLS 1.3. */ |
XiaokangQian | de33391 | 2022-04-20 08:49:42 +0000 | [diff] [blame] | 735 | if( tls_version == MBEDTLS_SSL_VERSION_TLS1_3 ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 736 | { |
| 737 | tls13_supported = 1; |
| 738 | break; |
| 739 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 740 | } |
| 741 | |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 742 | if( !tls13_supported ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 743 | { |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 744 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLS 1.3 is not supported by the client" ) ); |
| 745 | |
| 746 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION, |
| 747 | MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION ); |
| 748 | return( MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION ); |
| 749 | } |
| 750 | |
XiaokangQian | de33391 | 2022-04-20 08:49:42 +0000 | [diff] [blame] | 751 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "Negotiated version. Supported is [%04x]", |
XiaokangQian | 0a1b54e | 2022-04-21 03:01:38 +0000 | [diff] [blame] | 752 | (unsigned int)tls_version ) ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 753 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 754 | return( 0 ); |
| 755 | } |
| 756 | |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 757 | #if defined(MBEDTLS_ECDH_C) |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 758 | /* |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 759 | * |
| 760 | * From RFC 8446: |
| 761 | * enum { |
| 762 | * ... (0xFFFF) |
| 763 | * } NamedGroup; |
| 764 | * struct { |
| 765 | * NamedGroup named_group_list<2..2^16-1>; |
| 766 | * } NamedGroupList; |
| 767 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 768 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 769 | static int ssl_tls13_parse_supported_groups_ext( mbedtls_ssl_context *ssl, |
| 770 | const unsigned char *buf, |
| 771 | const unsigned char *end ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 772 | { |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 773 | const unsigned char *p = buf; |
XiaokangQian | 8482377 | 2022-04-19 07:57:30 +0000 | [diff] [blame] | 774 | size_t named_group_list_len; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 775 | const unsigned char *named_group_list_end; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 776 | |
| 777 | MBEDTLS_SSL_DEBUG_BUF( 3, "supported_groups extension", p, end - buf ); |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 778 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 ); |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 779 | named_group_list_len = MBEDTLS_GET_UINT16_BE( p, 0 ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 780 | p += 2; |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 781 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, named_group_list_len ); |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 782 | named_group_list_end = p + named_group_list_len; |
XiaokangQian | 4e8cd7b | 2022-04-21 09:48:09 +0000 | [diff] [blame] | 783 | ssl->handshake->hrr_selected_group = 0; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 784 | |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 785 | while( p < named_group_list_end ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 786 | { |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 787 | uint16_t named_group; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 788 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, named_group_list_end, 2 ); |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 789 | named_group = MBEDTLS_GET_UINT16_BE( p, 0 ); |
| 790 | p += 2; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 791 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 792 | MBEDTLS_SSL_DEBUG_MSG( 2, |
| 793 | ( "got named group: %s(%04x)", |
| 794 | mbedtls_ssl_named_group_to_str( named_group ), |
| 795 | named_group ) ); |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 796 | |
| 797 | if( ! mbedtls_ssl_named_group_is_offered( ssl, named_group ) || |
| 798 | ! mbedtls_ssl_named_group_is_supported( named_group ) || |
XiaokangQian | 4e8cd7b | 2022-04-21 09:48:09 +0000 | [diff] [blame] | 799 | ssl->handshake->hrr_selected_group != 0 ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 800 | { |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 801 | continue; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 802 | } |
| 803 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 804 | MBEDTLS_SSL_DEBUG_MSG( 2, |
| 805 | ( "add named group %s(%04x) into received list.", |
| 806 | mbedtls_ssl_named_group_to_str( named_group ), |
| 807 | named_group ) ); |
| 808 | |
XiaokangQian | 4e8cd7b | 2022-04-21 09:48:09 +0000 | [diff] [blame] | 809 | ssl->handshake->hrr_selected_group = named_group; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 810 | } |
| 811 | |
| 812 | return( 0 ); |
| 813 | |
| 814 | } |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 815 | #endif /* MBEDTLS_ECDH_C */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 816 | |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 817 | #define SSL_TLS1_3_PARSE_KEY_SHARES_EXT_NO_MATCH 1 |
| 818 | |
XiaokangQian | 8840888 | 2022-04-02 10:15:03 +0000 | [diff] [blame] | 819 | #if defined(MBEDTLS_ECDH_C) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 820 | /* |
| 821 | * ssl_tls13_parse_key_shares_ext() verifies whether the information in the |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 822 | * 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] | 823 | * |
| 824 | * Possible return values are: |
| 825 | * - 0: Successful processing of the client provided key share extension. |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 826 | * - 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] | 827 | * does not match a group supported by the server. A HelloRetryRequest will |
| 828 | * be needed. |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 829 | * - A negative value for fatal errors. |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 830 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 831 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 832 | static int ssl_tls13_parse_key_shares_ext( mbedtls_ssl_context *ssl, |
| 833 | const unsigned char *buf, |
| 834 | const unsigned char *end ) |
| 835 | { |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 836 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 837 | unsigned char const *p = buf; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 838 | unsigned char const *client_shares_end; |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 839 | size_t client_shares_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 840 | |
| 841 | /* From RFC 8446: |
| 842 | * |
| 843 | * struct { |
| 844 | * KeyShareEntry client_shares<0..2^16-1>; |
| 845 | * } KeyShareClientHello; |
| 846 | * |
| 847 | */ |
| 848 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 849 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 ); |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 850 | client_shares_len = MBEDTLS_GET_UINT16_BE( p, 0 ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 851 | p += 2; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 852 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, client_shares_len ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 853 | |
| 854 | ssl->handshake->offered_group_id = 0; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 855 | client_shares_end = p + client_shares_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 856 | |
| 857 | /* We try to find a suitable key share entry and copy it to the |
| 858 | * handshake context. Later, we have to find out whether we can do |
| 859 | * something with the provided key share or whether we have to |
XiaokangQian | c5763b5 | 2022-04-02 03:34:37 +0000 | [diff] [blame] | 860 | * dismiss it and send a HelloRetryRequest message. |
| 861 | */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 862 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 863 | while( p < client_shares_end ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 864 | { |
XiaokangQian | 9b5d04b | 2022-04-10 10:20:43 +0000 | [diff] [blame] | 865 | uint16_t group; |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 866 | size_t key_exchange_len; |
Jerry Yu | 086edc2 | 2022-05-05 10:50:38 +0800 | [diff] [blame] | 867 | const unsigned char *key_exchange; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 868 | |
| 869 | /* |
| 870 | * struct { |
| 871 | * NamedGroup group; |
| 872 | * opaque key_exchange<1..2^16-1>; |
| 873 | * } KeyShareEntry; |
| 874 | */ |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 875 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, client_shares_end, 4 ); |
XiaokangQian | 9b5d04b | 2022-04-10 10:20:43 +0000 | [diff] [blame] | 876 | group = MBEDTLS_GET_UINT16_BE( p, 0 ); |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 877 | key_exchange_len = MBEDTLS_GET_UINT16_BE( p, 2 ); |
| 878 | p += 4; |
Jerry Yu | 086edc2 | 2022-05-05 10:50:38 +0800 | [diff] [blame] | 879 | key_exchange = p; |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 880 | 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] | 881 | p += key_exchange_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 882 | |
| 883 | /* Continue parsing even if we have already found a match, |
XiaokangQian | c5763b5 | 2022-04-02 03:34:37 +0000 | [diff] [blame] | 884 | * for input validation purposes. |
| 885 | */ |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 886 | if( ! mbedtls_ssl_named_group_is_offered( ssl, group ) || |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 887 | ! mbedtls_ssl_named_group_is_supported( group ) || |
| 888 | ssl->handshake->offered_group_id != 0 ) |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 889 | { |
| 890 | continue; |
| 891 | } |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 892 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 893 | /* |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 894 | * For now, we only support ECDHE groups. |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 895 | */ |
XiaokangQian | 9b5d04b | 2022-04-10 10:20:43 +0000 | [diff] [blame] | 896 | if( mbedtls_ssl_tls13_named_group_is_ecdhe( group ) ) |
| 897 | { |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 898 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDH group: %s (%04x)", |
| 899 | mbedtls_ssl_named_group_to_str( group ), |
| 900 | group ) ); |
XiaokangQian | 318dc76 | 2022-04-20 09:43:51 +0000 | [diff] [blame] | 901 | ret = mbedtls_ssl_tls13_read_public_ecdhe_share( |
Jerry Yu | 086edc2 | 2022-05-05 10:50:38 +0800 | [diff] [blame] | 902 | ssl, key_exchange - 2, key_exchange_len + 2 ); |
XiaokangQian | 9b5d04b | 2022-04-10 10:20:43 +0000 | [diff] [blame] | 903 | if( ret != 0 ) |
| 904 | return( ret ); |
XiaokangQian | 4e8cd7b | 2022-04-21 09:48:09 +0000 | [diff] [blame] | 905 | |
XiaokangQian | 9b5d04b | 2022-04-10 10:20:43 +0000 | [diff] [blame] | 906 | } |
| 907 | else |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 908 | { |
| 909 | MBEDTLS_SSL_DEBUG_MSG( 4, ( "Unrecognized NamedGroup %u", |
XiaokangQian | 9b5d04b | 2022-04-10 10:20:43 +0000 | [diff] [blame] | 910 | (unsigned) group ) ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 911 | continue; |
| 912 | } |
| 913 | |
XiaokangQian | 9b5d04b | 2022-04-10 10:20:43 +0000 | [diff] [blame] | 914 | ssl->handshake->offered_group_id = group; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 915 | } |
| 916 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 917 | |
| 918 | if( ssl->handshake->offered_group_id == 0 ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 919 | { |
| 920 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "no matching key share" ) ); |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 921 | return( SSL_TLS1_3_PARSE_KEY_SHARES_EXT_NO_MATCH ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 922 | } |
| 923 | return( 0 ); |
| 924 | } |
XiaokangQian | 8840888 | 2022-04-02 10:15:03 +0000 | [diff] [blame] | 925 | #endif /* MBEDTLS_ECDH_C */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 926 | |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 927 | #if defined(MBEDTLS_DEBUG_C) |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 928 | static void ssl_tls13_debug_print_client_hello_exts( mbedtls_ssl_context *ssl ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 929 | { |
XiaokangQian | 3207a32 | 2022-02-23 03:15:27 +0000 | [diff] [blame] | 930 | ((void) ssl); |
| 931 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 932 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "Supported Extensions:" ) ); |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 933 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 934 | ( "- KEY_SHARE_EXTENSION ( %s )", |
| 935 | ( ( ssl->handshake->extensions_present |
| 936 | & MBEDTLS_SSL_EXT_KEY_SHARE ) > 0 ) ? "TRUE" : "FALSE" ) ); |
| 937 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 938 | ( "- PSK_KEY_EXCHANGE_MODES_EXTENSION ( %s )", |
| 939 | ( ( ssl->handshake->extensions_present |
| 940 | & MBEDTLS_SSL_EXT_PSK_KEY_EXCHANGE_MODES ) > 0 ) ? |
| 941 | "TRUE" : "FALSE" ) ); |
| 942 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 943 | ( "- PRE_SHARED_KEY_EXTENSION ( %s )", |
| 944 | ( ( ssl->handshake->extensions_present |
| 945 | & MBEDTLS_SSL_EXT_PRE_SHARED_KEY ) > 0 ) ? "TRUE" : "FALSE" ) ); |
| 946 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 947 | ( "- SIGNATURE_ALGORITHM_EXTENSION ( %s )", |
| 948 | ( ( ssl->handshake->extensions_present |
| 949 | & MBEDTLS_SSL_EXT_SIG_ALG ) > 0 ) ? "TRUE" : "FALSE" ) ); |
| 950 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 951 | ( "- SUPPORTED_GROUPS_EXTENSION ( %s )", |
| 952 | ( ( ssl->handshake->extensions_present |
| 953 | & MBEDTLS_SSL_EXT_SUPPORTED_GROUPS ) >0 ) ? |
| 954 | "TRUE" : "FALSE" ) ); |
| 955 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 956 | ( "- SUPPORTED_VERSION_EXTENSION ( %s )", |
| 957 | ( ( ssl->handshake->extensions_present |
| 958 | & MBEDTLS_SSL_EXT_SUPPORTED_VERSIONS ) > 0 ) ? |
| 959 | "TRUE" : "FALSE" ) ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 960 | #if defined ( MBEDTLS_SSL_SERVER_NAME_INDICATION ) |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 961 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 962 | ( "- SERVERNAME_EXTENSION ( %s )", |
| 963 | ( ( ssl->handshake->extensions_present |
| 964 | & MBEDTLS_SSL_EXT_SERVERNAME ) > 0 ) ? |
| 965 | "TRUE" : "FALSE" ) ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 966 | #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 967 | #if defined ( MBEDTLS_SSL_ALPN ) |
| 968 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 969 | ( "- ALPN_EXTENSION ( %s )", |
| 970 | ( ( ssl->handshake->extensions_present |
| 971 | & MBEDTLS_SSL_EXT_ALPN ) > 0 ) ? |
| 972 | "TRUE" : "FALSE" ) ); |
| 973 | #endif /* MBEDTLS_SSL_ALPN */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 974 | } |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 975 | #endif /* MBEDTLS_DEBUG_C */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 976 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 977 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 978 | static int ssl_tls13_client_hello_has_exts( mbedtls_ssl_context *ssl, |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 979 | int exts_mask ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 980 | { |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 981 | int masked = ssl->handshake->extensions_present & exts_mask; |
| 982 | return( masked == exts_mask ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 983 | } |
| 984 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 985 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 986 | static int ssl_tls13_client_hello_has_exts_for_ephemeral_key_exchange( |
| 987 | mbedtls_ssl_context *ssl ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 988 | { |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 989 | return( ssl_tls13_client_hello_has_exts( |
| 990 | ssl, |
| 991 | MBEDTLS_SSL_EXT_SUPPORTED_GROUPS | |
| 992 | MBEDTLS_SSL_EXT_KEY_SHARE | |
| 993 | MBEDTLS_SSL_EXT_SIG_ALG ) ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 994 | } |
| 995 | |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 996 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 997 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 998 | static int ssl_tls13_client_hello_has_exts_for_psk_key_exchange( |
| 999 | mbedtls_ssl_context *ssl ) |
| 1000 | { |
| 1001 | return( ssl_tls13_client_hello_has_exts( |
| 1002 | ssl, |
| 1003 | MBEDTLS_SSL_EXT_PRE_SHARED_KEY | |
| 1004 | MBEDTLS_SSL_EXT_PSK_KEY_EXCHANGE_MODES ) ); |
| 1005 | } |
| 1006 | |
| 1007 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 1008 | static int ssl_tls13_client_hello_has_exts_for_psk_ephemeral_key_exchange( |
| 1009 | mbedtls_ssl_context *ssl ) |
| 1010 | { |
| 1011 | return( ssl_tls13_client_hello_has_exts( |
| 1012 | ssl, |
| 1013 | MBEDTLS_SSL_EXT_SUPPORTED_GROUPS | |
| 1014 | MBEDTLS_SSL_EXT_KEY_SHARE | |
| 1015 | MBEDTLS_SSL_EXT_PRE_SHARED_KEY | |
| 1016 | MBEDTLS_SSL_EXT_PSK_KEY_EXCHANGE_MODES ) ); |
| 1017 | } |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1018 | #endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED */ |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1019 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1020 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1021 | static int ssl_tls13_check_ephemeral_key_exchange( mbedtls_ssl_context *ssl ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1022 | { |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1023 | return( mbedtls_ssl_conf_tls13_ephemeral_enabled( ssl ) && |
| 1024 | ssl_tls13_client_hello_has_exts_for_ephemeral_key_exchange( ssl ) ); |
| 1025 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1026 | |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1027 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 1028 | static int ssl_tls13_check_psk_key_exchange( mbedtls_ssl_context *ssl ) |
| 1029 | { |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1030 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1031 | return( mbedtls_ssl_conf_tls13_psk_enabled( ssl ) && |
| 1032 | mbedtls_ssl_tls13_psk_enabled( ssl ) && |
| 1033 | ssl_tls13_client_hello_has_exts_for_psk_key_exchange( ssl ) ); |
| 1034 | #else |
| 1035 | ((void) ssl); |
| 1036 | return( 0 ); |
| 1037 | #endif |
| 1038 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1039 | |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1040 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 1041 | static int ssl_tls13_check_psk_ephemeral_key_exchange( mbedtls_ssl_context *ssl ) |
| 1042 | { |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1043 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1044 | return( mbedtls_ssl_conf_tls13_psk_ephemeral_enabled( ssl ) && |
| 1045 | mbedtls_ssl_tls13_psk_ephemeral_enabled( ssl ) && |
| 1046 | ssl_tls13_client_hello_has_exts_for_psk_ephemeral_key_exchange( ssl ) ); |
| 1047 | #else |
| 1048 | ((void) ssl); |
| 1049 | return( 0 ); |
| 1050 | #endif |
| 1051 | } |
| 1052 | |
| 1053 | static int ssl_tls13_determine_key_exchange_mode( mbedtls_ssl_context *ssl ) |
| 1054 | { |
| 1055 | /* |
| 1056 | * Determine the key exchange algorithm to use. |
| 1057 | * There are three types of key exchanges supported in TLS 1.3: |
| 1058 | * - (EC)DH with ECDSA, |
| 1059 | * - (EC)DH with PSK, |
| 1060 | * - plain PSK. |
| 1061 | * |
| 1062 | * The PSK-based key exchanges may additionally be used with 0-RTT. |
| 1063 | * |
| 1064 | * Our built-in order of preference is |
Jerry Yu | ce6ed70 | 2022-07-22 21:49:53 +0800 | [diff] [blame] | 1065 | * 1 ) (EC)DHE-PSK Mode ( psk_ephemeral ) |
| 1066 | * 2 ) Certificate Mode ( ephemeral ) |
| 1067 | * 3 ) Plain PSK Mode ( psk ) |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1068 | */ |
| 1069 | |
| 1070 | ssl->handshake->key_exchange_mode = MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_NONE; |
| 1071 | |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1072 | if( ssl_tls13_check_psk_ephemeral_key_exchange( ssl ) ) |
| 1073 | { |
| 1074 | ssl->handshake->key_exchange_mode = |
| 1075 | MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL; |
| 1076 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "key exchange mode: psk_ephemeral" ) ); |
| 1077 | } |
| 1078 | else |
| 1079 | if( ssl_tls13_check_ephemeral_key_exchange( ssl ) ) |
| 1080 | { |
| 1081 | ssl->handshake->key_exchange_mode = |
| 1082 | MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL; |
| 1083 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "key exchange mode: ephemeral" ) ); |
| 1084 | } |
| 1085 | else |
Jerry Yu | ce6ed70 | 2022-07-22 21:49:53 +0800 | [diff] [blame] | 1086 | if( ssl_tls13_check_psk_key_exchange( ssl ) ) |
| 1087 | { |
| 1088 | ssl->handshake->key_exchange_mode = |
| 1089 | MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK; |
| 1090 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "key exchange mode: psk" ) ); |
| 1091 | } |
| 1092 | else |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1093 | { |
| 1094 | MBEDTLS_SSL_DEBUG_MSG( |
| 1095 | 1, |
| 1096 | ( "ClientHello message misses mandatory extensions." ) ); |
| 1097 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_MISSING_EXTENSION , |
| 1098 | MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER ); |
| 1099 | return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER ); |
| 1100 | } |
| 1101 | |
| 1102 | return( 0 ); |
| 1103 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1104 | } |
| 1105 | |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1106 | #if defined(MBEDTLS_X509_CRT_PARSE_C) && \ |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 1107 | defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED) |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1108 | |
| 1109 | #if defined(MBEDTLS_USE_PSA_CRYPTO) |
| 1110 | static psa_algorithm_t ssl_tls13_iana_sig_alg_to_psa_alg( uint16_t sig_alg ) |
| 1111 | { |
| 1112 | switch( sig_alg ) |
| 1113 | { |
| 1114 | case MBEDTLS_TLS1_3_SIG_ECDSA_SECP256R1_SHA256: |
| 1115 | return( PSA_ALG_ECDSA( PSA_ALG_SHA_256 ) ); |
| 1116 | case MBEDTLS_TLS1_3_SIG_ECDSA_SECP384R1_SHA384: |
| 1117 | return( PSA_ALG_ECDSA( PSA_ALG_SHA_384 ) ); |
| 1118 | case MBEDTLS_TLS1_3_SIG_ECDSA_SECP521R1_SHA512: |
| 1119 | return( PSA_ALG_ECDSA( PSA_ALG_SHA_512 ) ); |
| 1120 | case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256: |
| 1121 | return( PSA_ALG_RSA_PSS( PSA_ALG_SHA_256 ) ); |
| 1122 | case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA384: |
| 1123 | return( PSA_ALG_RSA_PSS( PSA_ALG_SHA_384 ) ); |
| 1124 | case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA512: |
| 1125 | return( PSA_ALG_RSA_PSS( PSA_ALG_SHA_512 ) ); |
| 1126 | case MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA256: |
Ronald Cron | b72dac4 | 2022-09-27 08:56:47 +0200 | [diff] [blame] | 1127 | return( PSA_ALG_RSA_PKCS1V15_SIGN( PSA_ALG_SHA_256 ) ); |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1128 | case MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA384: |
Ronald Cron | b72dac4 | 2022-09-27 08:56:47 +0200 | [diff] [blame] | 1129 | return( PSA_ALG_RSA_PKCS1V15_SIGN( PSA_ALG_SHA_384 ) ); |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1130 | case MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA512: |
Ronald Cron | b72dac4 | 2022-09-27 08:56:47 +0200 | [diff] [blame] | 1131 | return( PSA_ALG_RSA_PKCS1V15_SIGN( PSA_ALG_SHA_512 ) ); |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1132 | default: |
| 1133 | return( PSA_ALG_NONE ); |
| 1134 | } |
| 1135 | } |
| 1136 | #endif /* MBEDTLS_USE_PSA_CRYPTO */ |
| 1137 | |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1138 | /* |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1139 | * Pick best ( private key, certificate chain ) pair based on the signature |
| 1140 | * algorithms supported by the client. |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1141 | */ |
Ronald Cron | ce7d76e | 2022-07-08 18:56:49 +0200 | [diff] [blame] | 1142 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | 07aad07 | 2022-06-14 05:35:09 +0000 | [diff] [blame] | 1143 | static int ssl_tls13_pick_key_cert( mbedtls_ssl_context *ssl ) |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1144 | { |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1145 | mbedtls_ssl_key_cert *key_cert, *key_cert_list; |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1146 | const uint16_t *sig_alg = ssl->handshake->received_sig_algs; |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1147 | |
| 1148 | #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
| 1149 | if( ssl->handshake->sni_key_cert != NULL ) |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1150 | key_cert_list = ssl->handshake->sni_key_cert; |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1151 | else |
| 1152 | #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1153 | key_cert_list = ssl->conf->key_cert; |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1154 | |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1155 | if( key_cert_list == NULL ) |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1156 | { |
| 1157 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "server has no certificate" ) ); |
| 1158 | return( -1 ); |
| 1159 | } |
| 1160 | |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1161 | for( ; *sig_alg != MBEDTLS_TLS1_3_SIG_NONE; sig_alg++ ) |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1162 | { |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1163 | if( !mbedtls_ssl_sig_alg_is_offered( ssl, *sig_alg ) ) |
| 1164 | continue; |
| 1165 | |
| 1166 | if( !mbedtls_ssl_tls13_sig_alg_for_cert_verify_is_supported( *sig_alg ) ) |
| 1167 | continue; |
| 1168 | |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1169 | for( key_cert = key_cert_list; key_cert != NULL; |
| 1170 | key_cert = key_cert->next ) |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1171 | { |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1172 | #if defined(MBEDTLS_USE_PSA_CRYPTO) |
| 1173 | psa_algorithm_t psa_alg = PSA_ALG_NONE; |
| 1174 | #endif /* MBEDTLS_USE_PSA_CRYPTO */ |
| 1175 | |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1176 | MBEDTLS_SSL_DEBUG_CRT( 3, "certificate (chain) candidate", |
| 1177 | key_cert->cert ); |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1178 | |
| 1179 | /* |
| 1180 | * This avoids sending the client a cert it'll reject based on |
| 1181 | * keyUsage or other extensions. |
| 1182 | */ |
| 1183 | if( mbedtls_x509_crt_check_key_usage( |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1184 | key_cert->cert, MBEDTLS_X509_KU_DIGITAL_SIGNATURE ) != 0 || |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1185 | mbedtls_x509_crt_check_extended_key_usage( |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1186 | key_cert->cert, MBEDTLS_OID_SERVER_AUTH, |
| 1187 | MBEDTLS_OID_SIZE( MBEDTLS_OID_SERVER_AUTH ) ) != 0 ) |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1188 | { |
| 1189 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: " |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1190 | "(extended) key usage extension" ) ); |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1191 | continue; |
| 1192 | } |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1193 | |
Jerry Yu | cc53910 | 2022-06-27 16:27:35 +0800 | [diff] [blame] | 1194 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 1195 | ( "ssl_tls13_pick_key_cert:" |
| 1196 | "check signature algorithm %s [%04x]", |
| 1197 | mbedtls_ssl_sig_alg_to_str( *sig_alg ), |
| 1198 | *sig_alg ) ); |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1199 | #if defined(MBEDTLS_USE_PSA_CRYPTO) |
| 1200 | psa_alg = ssl_tls13_iana_sig_alg_to_psa_alg( *sig_alg ); |
| 1201 | #endif /* MBEDTLS_USE_PSA_CRYPTO */ |
| 1202 | |
Jerry Yu | fb52669 | 2022-06-19 11:22:49 +0800 | [diff] [blame] | 1203 | if( mbedtls_ssl_tls13_check_sig_alg_cert_key_match( |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1204 | *sig_alg, &key_cert->cert->pk ) |
| 1205 | #if defined(MBEDTLS_USE_PSA_CRYPTO) |
| 1206 | && psa_alg != PSA_ALG_NONE && |
| 1207 | mbedtls_pk_can_do_ext( &key_cert->cert->pk, psa_alg, |
| 1208 | PSA_KEY_USAGE_SIGN_HASH ) == 1 |
| 1209 | #endif /* MBEDTLS_USE_PSA_CRYPTO */ |
| 1210 | ) |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1211 | { |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1212 | ssl->handshake->key_cert = key_cert; |
Jerry Yu | cc53910 | 2022-06-27 16:27:35 +0800 | [diff] [blame] | 1213 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 1214 | ( "ssl_tls13_pick_key_cert:" |
| 1215 | "selected signature algorithm" |
| 1216 | " %s [%04x]", |
| 1217 | mbedtls_ssl_sig_alg_to_str( *sig_alg ), |
| 1218 | *sig_alg ) ); |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1219 | MBEDTLS_SSL_DEBUG_CRT( |
XiaokangQian | 75fe8c7 | 2022-06-15 09:42:45 +0000 | [diff] [blame] | 1220 | 3, "selected certificate (chain)", |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1221 | ssl->handshake->key_cert->cert ); |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1222 | return( 0 ); |
| 1223 | } |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1224 | } |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1225 | } |
| 1226 | |
Jerry Yu | 9d3e2fa | 2022-06-27 22:14:01 +0800 | [diff] [blame] | 1227 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "ssl_tls13_pick_key_cert:" |
| 1228 | "no suitable certificate found" ) ); |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1229 | return( -1 ); |
| 1230 | } |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1231 | #endif /* MBEDTLS_X509_CRT_PARSE_C && |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 1232 | MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED */ |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1233 | |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1234 | /* |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1235 | * |
| 1236 | * STATE HANDLING: ClientHello |
| 1237 | * |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1238 | * There are three possible classes of outcomes when parsing the ClientHello: |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1239 | * |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1240 | * 1) The ClientHello was well-formed and matched the server's configuration. |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1241 | * |
| 1242 | * In this case, the server progresses to sending its ServerHello. |
| 1243 | * |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1244 | * 2) The ClientHello was well-formed but didn't match the server's |
| 1245 | * configuration. |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1246 | * |
| 1247 | * For example, the client might not have offered a key share which |
| 1248 | * the server supports, or the server might require a cookie. |
| 1249 | * |
| 1250 | * In this case, the server sends a HelloRetryRequest. |
| 1251 | * |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1252 | * 3) The ClientHello was ill-formed |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1253 | * |
| 1254 | * In this case, we abort the handshake. |
| 1255 | * |
| 1256 | */ |
| 1257 | |
| 1258 | /* |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1259 | * Structure of this message: |
| 1260 | * |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1261 | * uint16 ProtocolVersion; |
| 1262 | * opaque Random[32]; |
| 1263 | * uint8 CipherSuite[2]; // Cryptographic suite selector |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1264 | * |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1265 | * struct { |
| 1266 | * ProtocolVersion legacy_version = 0x0303; // TLS v1.2 |
| 1267 | * Random random; |
| 1268 | * opaque legacy_session_id<0..32>; |
| 1269 | * CipherSuite cipher_suites<2..2^16-2>; |
| 1270 | * opaque legacy_compression_methods<1..2^8-1>; |
| 1271 | * Extension extensions<8..2^16-1>; |
| 1272 | * } ClientHello; |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1273 | */ |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1274 | |
| 1275 | #define SSL_CLIENT_HELLO_OK 0 |
| 1276 | #define SSL_CLIENT_HELLO_HRR_REQUIRED 1 |
| 1277 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1278 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1279 | static int ssl_tls13_parse_client_hello( mbedtls_ssl_context *ssl, |
| 1280 | const unsigned char *buf, |
| 1281 | const unsigned char *end ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1282 | { |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1283 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 1284 | const unsigned char *p = buf; |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1285 | size_t legacy_session_id_len; |
XiaokangQian | 318dc76 | 2022-04-20 09:43:51 +0000 | [diff] [blame] | 1286 | size_t cipher_suites_len; |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 1287 | const unsigned char *cipher_suites_end; |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1288 | size_t extensions_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1289 | const unsigned char *extensions_end; |
Jerry Yu | 49ca928 | 2022-05-05 11:05:22 +0800 | [diff] [blame] | 1290 | int hrr_required = 0; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1291 | |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1292 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1293 | const unsigned char *cipher_suites; |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 1294 | const unsigned char *pre_shared_key_ext = NULL; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1295 | const unsigned char *pre_shared_key_ext_end = NULL; |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1296 | #endif |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1297 | |
| 1298 | ssl->handshake->extensions_present = MBEDTLS_SSL_EXT_NONE; |
| 1299 | |
| 1300 | /* |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1301 | * ClientHello layout: |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1302 | * 0 . 1 protocol version |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1303 | * 2 . 33 random bytes |
XiaokangQian | c5763b5 | 2022-04-02 03:34:37 +0000 | [diff] [blame] | 1304 | * 34 . 34 session id length ( 1 byte ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1305 | * 35 . 34+x session id |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1306 | * .. . .. ciphersuite list length ( 2 bytes ) |
| 1307 | * .. . .. ciphersuite list |
| 1308 | * .. . .. compression alg. list length ( 1 byte ) |
| 1309 | * .. . .. compression alg. list |
| 1310 | * .. . .. extensions length ( 2 bytes, optional ) |
| 1311 | * .. . .. extensions ( optional ) |
| 1312 | */ |
| 1313 | |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1314 | /* |
bootstrap-prime | 6dbbf44 | 2022-05-17 19:30:44 -0400 | [diff] [blame] | 1315 | * Minimal length ( with everything empty and extensions omitted ) is |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1316 | * 2 + 32 + 1 + 2 + 1 = 38 bytes. Check that first, so that we can |
| 1317 | * read at least up to session id length without worrying. |
| 1318 | */ |
| 1319 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 38 ); |
| 1320 | |
| 1321 | /* ... |
| 1322 | * ProtocolVersion legacy_version = 0x0303; // TLS 1.2 |
| 1323 | * ... |
| 1324 | * with ProtocolVersion defined as: |
| 1325 | * uint16 ProtocolVersion; |
| 1326 | */ |
XiaokangQian | de33391 | 2022-04-20 08:49:42 +0000 | [diff] [blame] | 1327 | if( mbedtls_ssl_read_version( p, ssl->conf->transport ) != |
| 1328 | MBEDTLS_SSL_VERSION_TLS1_2 ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1329 | { |
| 1330 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "Unsupported version of TLS." ) ); |
| 1331 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION, |
| 1332 | MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION ); |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1333 | return ( MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1334 | } |
| 1335 | p += 2; |
| 1336 | |
| 1337 | /* |
XiaokangQian | f8ceb94 | 2022-04-15 11:43:27 +0000 | [diff] [blame] | 1338 | * Only support TLS 1.3 currently, temporarily set the version. |
| 1339 | */ |
XiaokangQian | de33391 | 2022-04-20 08:49:42 +0000 | [diff] [blame] | 1340 | ssl->tls_version = MBEDTLS_SSL_VERSION_TLS1_3; |
XiaokangQian | f8ceb94 | 2022-04-15 11:43:27 +0000 | [diff] [blame] | 1341 | |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 1342 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
| 1343 | /* Store minor version for later use with ticket serialization. */ |
| 1344 | ssl->session_negotiate->tls_version = MBEDTLS_SSL_VERSION_TLS1_3; |
Jerry Yu | a66fece | 2022-07-13 14:30:29 +0800 | [diff] [blame] | 1345 | ssl->session_negotiate->endpoint = ssl->conf->endpoint; |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 1346 | #endif |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 1347 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1348 | /* ... |
| 1349 | * Random random; |
| 1350 | * ... |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1351 | * with Random defined as: |
| 1352 | * opaque Random[32]; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1353 | */ |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1354 | MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes", |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 1355 | p, MBEDTLS_CLIENT_HELLO_RANDOM_LEN ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1356 | |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 1357 | memcpy( &ssl->handshake->randbytes[0], p, MBEDTLS_CLIENT_HELLO_RANDOM_LEN ); |
| 1358 | p += MBEDTLS_CLIENT_HELLO_RANDOM_LEN; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1359 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1360 | /* ... |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1361 | * opaque legacy_session_id<0..32>; |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1362 | * ... |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1363 | */ |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1364 | legacy_session_id_len = p[0]; |
XiaokangQian | c5763b5 | 2022-04-02 03:34:37 +0000 | [diff] [blame] | 1365 | p++; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1366 | |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1367 | if( legacy_session_id_len > sizeof( ssl->session_negotiate->id ) ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1368 | { |
| 1369 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 1370 | return( MBEDTLS_ERR_SSL_DECODE_ERROR ); |
| 1371 | } |
| 1372 | |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1373 | ssl->session_negotiate->id_len = legacy_session_id_len; |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1374 | MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1375 | p, legacy_session_id_len ); |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1376 | /* |
| 1377 | * Check we have enough data for the legacy session identifier |
Jerry Yu | e95c8af | 2022-07-26 15:48:20 +0800 | [diff] [blame] | 1378 | * and the ciphersuite list length. |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1379 | */ |
| 1380 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, legacy_session_id_len + 2 ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1381 | |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1382 | memcpy( &ssl->session_negotiate->id[0], p, legacy_session_id_len ); |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1383 | p += legacy_session_id_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1384 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1385 | cipher_suites_len = MBEDTLS_GET_UINT16_BE( p, 0 ); |
| 1386 | p += 2; |
| 1387 | |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1388 | /* Check we have enough data for the ciphersuite list, the legacy |
| 1389 | * compression methods and the length of the extensions. |
Jerry Yu | e95c8af | 2022-07-26 15:48:20 +0800 | [diff] [blame] | 1390 | * |
| 1391 | * cipher_suites cipher_suites_len bytes |
| 1392 | * legacy_compression_methods 2 bytes |
| 1393 | * extensions_len 2 bytes |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1394 | */ |
| 1395 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, cipher_suites_len + 2 + 2 ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1396 | |
Jerry Yu | 24b8c81 | 2022-08-20 19:06:56 +0800 | [diff] [blame] | 1397 | /* ... |
| 1398 | * CipherSuite cipher_suites<2..2^16-2>; |
| 1399 | * ... |
| 1400 | * with CipherSuite defined as: |
| 1401 | * uint8 CipherSuite[2]; |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 1402 | */ |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1403 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 1404 | cipher_suites = p; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1405 | #endif |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 1406 | cipher_suites_end = p + cipher_suites_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1407 | MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist", |
| 1408 | p, cipher_suites_len ); |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1409 | |
| 1410 | /* |
| 1411 | * Search for a matching ciphersuite |
| 1412 | */ |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 1413 | for ( ; p < cipher_suites_end; p += 2 ) |
XiaokangQian | 17f974c | 2022-04-19 09:57:41 +0000 | [diff] [blame] | 1414 | { |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1415 | uint16_t cipher_suite; |
Jerry Yu | e95c8af | 2022-07-26 15:48:20 +0800 | [diff] [blame] | 1416 | const mbedtls_ssl_ciphersuite_t* ciphersuite_info; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1417 | |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1418 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, cipher_suites_end, 2 ); |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1419 | |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1420 | cipher_suite = MBEDTLS_GET_UINT16_BE( p, 0 ); |
Jerry Yu | c5a23a0 | 2022-08-25 10:51:44 +0800 | [diff] [blame] | 1421 | ciphersuite_info = ssl_tls13_validate_peer_ciphersuite( |
Jerry Yu | dd1bef7 | 2022-08-23 17:57:02 +0800 | [diff] [blame] | 1422 | ssl,cipher_suite ); |
| 1423 | if( ciphersuite_info == NULL ) |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1424 | continue; |
| 1425 | |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1426 | ssl->session_negotiate->ciphersuite = cipher_suite; |
| 1427 | ssl->handshake->ciphersuite_info = ciphersuite_info; |
| 1428 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %04x - %s", |
Jerry Yu | e95c8af | 2022-07-26 15:48:20 +0800 | [diff] [blame] | 1429 | cipher_suite, |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1430 | ciphersuite_info->name ) ); |
XiaokangQian | 17f974c | 2022-04-19 09:57:41 +0000 | [diff] [blame] | 1431 | } |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1432 | |
| 1433 | if( ssl->handshake->ciphersuite_info == NULL ) |
| 1434 | { |
| 1435 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE, |
| 1436 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 1437 | return ( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 1438 | } |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1439 | |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1440 | /* ... |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1441 | * opaque legacy_compression_methods<1..2^8-1>; |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1442 | * ... |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1443 | */ |
XiaokangQian | 0a1b54e | 2022-04-21 03:01:38 +0000 | [diff] [blame] | 1444 | if( p[0] != 1 || p[1] != MBEDTLS_SSL_COMPRESS_NULL ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1445 | { |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1446 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad legacy compression method" ) ); |
| 1447 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER, |
| 1448 | MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER ); |
| 1449 | return ( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1450 | } |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1451 | p += 2; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1452 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1453 | /* ... |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1454 | * Extension extensions<8..2^16-1>; |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1455 | * ... |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1456 | * with Extension defined as: |
| 1457 | * struct { |
| 1458 | * ExtensionType extension_type; |
| 1459 | * opaque extension_data<0..2^16-1>; |
| 1460 | * } Extension; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1461 | */ |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1462 | extensions_len = MBEDTLS_GET_UINT16_BE( p, 0 ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1463 | p += 2; |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1464 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, extensions_len ); |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1465 | extensions_end = p + extensions_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1466 | |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1467 | MBEDTLS_SSL_DEBUG_BUF( 3, "client hello extensions", p, extensions_len ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1468 | |
| 1469 | while( p < extensions_end ) |
| 1470 | { |
| 1471 | unsigned int extension_type; |
| 1472 | size_t extension_data_len; |
| 1473 | const unsigned char *extension_data_end; |
| 1474 | |
Jerry Yu | 1c9247c | 2022-07-21 12:37:39 +0800 | [diff] [blame] | 1475 | /* RFC 8446, page 57 |
| 1476 | * |
| 1477 | * The "pre_shared_key" extension MUST be the last extension in the |
| 1478 | * ClientHello (this facilitates implementation as described below). |
| 1479 | * Servers MUST check that it is the last extension and otherwise fail |
| 1480 | * the handshake with an "illegal_parameter" alert. |
| 1481 | */ |
| 1482 | if( ssl->handshake->extensions_present & MBEDTLS_SSL_EXT_PRE_SHARED_KEY ) |
| 1483 | { |
| 1484 | MBEDTLS_SSL_DEBUG_MSG( |
| 1485 | 3, ( "pre_shared_key is not last extension." ) ); |
| 1486 | MBEDTLS_SSL_PEND_FATAL_ALERT( |
| 1487 | MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER, |
| 1488 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 1489 | return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 1490 | } |
| 1491 | |
XiaokangQian | 318dc76 | 2022-04-20 09:43:51 +0000 | [diff] [blame] | 1492 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, extensions_end, 4 ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1493 | extension_type = MBEDTLS_GET_UINT16_BE( p, 0 ); |
| 1494 | extension_data_len = MBEDTLS_GET_UINT16_BE( p, 2 ); |
| 1495 | p += 4; |
| 1496 | |
| 1497 | MBEDTLS_SSL_CHK_BUF_READ_PTR( p, extensions_end, extension_data_len ); |
| 1498 | extension_data_end = p + extension_data_len; |
| 1499 | |
| 1500 | switch( extension_type ) |
| 1501 | { |
XiaokangQian | 40a3523 | 2022-05-07 09:02:40 +0000 | [diff] [blame] | 1502 | #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
| 1503 | case MBEDTLS_TLS_EXT_SERVERNAME: |
| 1504 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ServerName extension" ) ); |
XiaokangQian | 9b2b771 | 2022-05-17 02:57:00 +0000 | [diff] [blame] | 1505 | ret = mbedtls_ssl_parse_server_name_ext( ssl, p, |
| 1506 | extension_data_end ); |
XiaokangQian | 40a3523 | 2022-05-07 09:02:40 +0000 | [diff] [blame] | 1507 | if( ret != 0 ) |
| 1508 | { |
| 1509 | MBEDTLS_SSL_DEBUG_RET( |
| 1510 | 1, "mbedtls_ssl_parse_servername_ext", ret ); |
| 1511 | return( ret ); |
| 1512 | } |
| 1513 | ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_SERVERNAME; |
| 1514 | break; |
| 1515 | #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ |
| 1516 | |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1517 | #if defined(MBEDTLS_ECDH_C) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1518 | case MBEDTLS_TLS_EXT_SUPPORTED_GROUPS: |
| 1519 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported group extension" ) ); |
| 1520 | |
| 1521 | /* Supported Groups Extension |
| 1522 | * |
| 1523 | * When sent by the client, the "supported_groups" extension |
| 1524 | * indicates the named groups which the client supports, |
| 1525 | * ordered from most preferred to least preferred. |
| 1526 | */ |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1527 | ret = ssl_tls13_parse_supported_groups_ext( |
| 1528 | ssl, p, extension_data_end ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1529 | if( ret != 0 ) |
| 1530 | { |
| 1531 | MBEDTLS_SSL_DEBUG_RET( 1, |
| 1532 | "mbedtls_ssl_parse_supported_groups_ext", ret ); |
| 1533 | return( ret ); |
| 1534 | } |
| 1535 | |
| 1536 | ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_SUPPORTED_GROUPS; |
| 1537 | break; |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1538 | #endif /* MBEDTLS_ECDH_C */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1539 | |
XiaokangQian | 8840888 | 2022-04-02 10:15:03 +0000 | [diff] [blame] | 1540 | #if defined(MBEDTLS_ECDH_C) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1541 | case MBEDTLS_TLS_EXT_KEY_SHARE: |
| 1542 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "found key share extension" ) ); |
| 1543 | |
| 1544 | /* |
| 1545 | * Key Share Extension |
| 1546 | * |
| 1547 | * When sent by the client, the "key_share" extension |
| 1548 | * contains the endpoint's cryptographic parameters for |
| 1549 | * ECDHE/DHE key establishment methods. |
| 1550 | */ |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1551 | ret = ssl_tls13_parse_key_shares_ext( |
| 1552 | ssl, p, extension_data_end ); |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 1553 | if( ret == SSL_TLS1_3_PARSE_KEY_SHARES_EXT_NO_MATCH ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1554 | { |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1555 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "HRR needed " ) ); |
Jerry Yu | 49ca928 | 2022-05-05 11:05:22 +0800 | [diff] [blame] | 1556 | hrr_required = 1; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1557 | } |
| 1558 | |
Jerry Yu | 582dd06 | 2022-04-22 21:59:01 +0800 | [diff] [blame] | 1559 | if( ret < 0 ) |
| 1560 | { |
| 1561 | MBEDTLS_SSL_DEBUG_RET( |
| 1562 | 1, "ssl_tls13_parse_key_shares_ext", ret ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1563 | return( ret ); |
Jerry Yu | 582dd06 | 2022-04-22 21:59:01 +0800 | [diff] [blame] | 1564 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1565 | |
| 1566 | ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_KEY_SHARE; |
| 1567 | break; |
XiaokangQian | 8840888 | 2022-04-02 10:15:03 +0000 | [diff] [blame] | 1568 | #endif /* MBEDTLS_ECDH_C */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1569 | |
| 1570 | case MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS: |
| 1571 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported versions extension" ) ); |
| 1572 | |
| 1573 | ret = ssl_tls13_parse_supported_versions_ext( |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1574 | ssl, p, extension_data_end ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1575 | if( ret != 0 ) |
| 1576 | { |
| 1577 | MBEDTLS_SSL_DEBUG_RET( 1, |
| 1578 | ( "ssl_tls13_parse_supported_versions_ext" ), ret ); |
| 1579 | return( ret ); |
| 1580 | } |
| 1581 | ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_SUPPORTED_VERSIONS; |
| 1582 | break; |
| 1583 | |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1584 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 1585 | case MBEDTLS_TLS_EXT_PSK_KEY_EXCHANGE_MODES: |
| 1586 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "found psk key exchange modes extension" ) ); |
| 1587 | |
| 1588 | ret = ssl_tls13_parse_key_exchange_modes_ext( |
| 1589 | ssl, p, extension_data_end ); |
| 1590 | if( ret != 0 ) |
| 1591 | { |
| 1592 | MBEDTLS_SSL_DEBUG_RET( |
| 1593 | 1, "ssl_tls13_parse_key_exchange_modes_ext", ret ); |
| 1594 | return( ret ); |
| 1595 | } |
| 1596 | |
| 1597 | ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_PSK_KEY_EXCHANGE_MODES; |
| 1598 | break; |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1599 | #endif |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 1600 | |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1601 | case MBEDTLS_TLS_EXT_PRE_SHARED_KEY: |
| 1602 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "found pre_shared_key extension" ) ); |
Jerry Yu | 13ab81d | 2022-07-22 23:17:11 +0800 | [diff] [blame] | 1603 | if( ( ssl->handshake->extensions_present & |
| 1604 | MBEDTLS_SSL_EXT_PSK_KEY_EXCHANGE_MODES ) == 0 ) |
| 1605 | { |
| 1606 | MBEDTLS_SSL_PEND_FATAL_ALERT( |
| 1607 | MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER, |
| 1608 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 1609 | return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 1610 | } |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1611 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1612 | /* Delay processing of the PSK identity once we have |
| 1613 | * found out which algorithms to use. We keep a pointer |
| 1614 | * to the buffer and the size for later processing. |
| 1615 | */ |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 1616 | pre_shared_key_ext = p; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1617 | pre_shared_key_ext_end = extension_data_end; |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1618 | #endif |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1619 | ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_PRE_SHARED_KEY; |
| 1620 | break; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1621 | |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 1622 | #if defined(MBEDTLS_SSL_ALPN) |
| 1623 | case MBEDTLS_TLS_EXT_ALPN: |
| 1624 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) ); |
| 1625 | |
| 1626 | ret = mbedtls_ssl_parse_alpn_ext( ssl, p, extension_data_end ); |
| 1627 | if( ret != 0 ) |
| 1628 | { |
| 1629 | MBEDTLS_SSL_DEBUG_RET( |
| 1630 | 1, ( "mbedtls_ssl_parse_alpn_ext" ), ret ); |
| 1631 | return( ret ); |
| 1632 | } |
| 1633 | ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_ALPN; |
| 1634 | break; |
| 1635 | #endif /* MBEDTLS_SSL_ALPN */ |
| 1636 | |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 1637 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1638 | case MBEDTLS_TLS_EXT_SIG_ALG: |
| 1639 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "found signature_algorithms extension" ) ); |
| 1640 | |
Gabor Mezei | 078e803 | 2022-04-27 21:17:56 +0200 | [diff] [blame] | 1641 | ret = mbedtls_ssl_parse_sig_alg_ext( |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1642 | ssl, p, extension_data_end ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1643 | if( ret != 0 ) |
| 1644 | { |
| 1645 | MBEDTLS_SSL_DEBUG_MSG( 1, |
| 1646 | ( "ssl_parse_supported_signature_algorithms_server_ext ( %d )", |
| 1647 | ret ) ); |
| 1648 | return( ret ); |
| 1649 | } |
| 1650 | ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_SIG_ALG; |
| 1651 | break; |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 1652 | #endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1653 | |
| 1654 | default: |
| 1655 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 1656 | ( "unknown extension found: %ud ( ignoring )", |
| 1657 | extension_type ) ); |
| 1658 | } |
| 1659 | |
| 1660 | p += extension_data_len; |
| 1661 | } |
| 1662 | |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1663 | #if defined(MBEDTLS_DEBUG_C) |
| 1664 | /* List all the extensions we have received */ |
| 1665 | ssl_tls13_debug_print_client_hello_exts( ssl ); |
| 1666 | #endif /* MBEDTLS_DEBUG_C */ |
| 1667 | |
| 1668 | mbedtls_ssl_add_hs_hdr_to_checksum( ssl, |
| 1669 | MBEDTLS_SSL_HS_CLIENT_HELLO, |
| 1670 | p - buf ); |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 1671 | |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1672 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1673 | /* Update checksum with either |
| 1674 | * - The entire content of the CH message, if no PSK extension is present |
| 1675 | * - The content up to but excluding the PSK extension, if present. |
| 1676 | */ |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1677 | /* 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] | 1678 | if( mbedtls_ssl_tls13_some_psk_enabled( ssl ) && |
Jerry Yu | 32e1370 | 2022-07-29 13:04:08 +0800 | [diff] [blame] | 1679 | mbedtls_ssl_conf_tls13_some_psk_enabled( ssl ) && |
Jerry Yu | ba9b6e9 | 2022-07-22 21:35:18 +0800 | [diff] [blame] | 1680 | ( ssl->handshake->extensions_present & MBEDTLS_SSL_EXT_PRE_SHARED_KEY ) ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1681 | { |
| 1682 | ssl->handshake->update_checksum( ssl, buf, |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 1683 | pre_shared_key_ext - buf ); |
Jerry Yu | bb85202 | 2022-07-20 21:10:44 +0800 | [diff] [blame] | 1684 | ret = ssl_tls13_parse_pre_shared_key_ext( ssl, |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 1685 | pre_shared_key_ext, |
Jerry Yu | e95c8af | 2022-07-26 15:48:20 +0800 | [diff] [blame] | 1686 | pre_shared_key_ext_end, |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1687 | cipher_suites, |
| 1688 | cipher_suites_end ); |
Jerry Yu | e9d4fc0 | 2022-08-20 19:21:15 +0800 | [diff] [blame] | 1689 | if( ret == MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY ) |
Jerry Yu | ba9b6e9 | 2022-07-22 21:35:18 +0800 | [diff] [blame] | 1690 | { |
| 1691 | ssl->handshake->extensions_present &= ~MBEDTLS_SSL_EXT_PRE_SHARED_KEY; |
Jerry Yu | 6f1db3f | 2022-07-22 23:05:59 +0800 | [diff] [blame] | 1692 | } |
| 1693 | else if( ret != 0 ) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1694 | { |
Jerry Yu | bb85202 | 2022-07-20 21:10:44 +0800 | [diff] [blame] | 1695 | MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_tls13_parse_pre_shared_key_ext" ), |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1696 | ret ); |
| 1697 | return( ret ); |
| 1698 | } |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1699 | } |
| 1700 | else |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1701 | #endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED */ |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1702 | { |
| 1703 | ssl->handshake->update_checksum( ssl, buf, p - buf ); |
| 1704 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1705 | |
Jerry Yu | ba9b6e9 | 2022-07-22 21:35:18 +0800 | [diff] [blame] | 1706 | ret = ssl_tls13_determine_key_exchange_mode( ssl ); |
| 1707 | if( ret < 0 ) |
| 1708 | return( ret ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1709 | |
Jerry Yu | e5834fd | 2022-08-29 20:16:09 +0800 | [diff] [blame] | 1710 | mbedtls_ssl_optimize_checksum( ssl, ssl->handshake->ciphersuite_info ); |
| 1711 | |
XiaokangQian | 75fe8c7 | 2022-06-15 09:42:45 +0000 | [diff] [blame] | 1712 | return( hrr_required ? SSL_CLIENT_HELLO_HRR_REQUIRED : SSL_CLIENT_HELLO_OK ); |
| 1713 | } |
| 1714 | |
| 1715 | /* Update the handshake state machine */ |
| 1716 | |
Ronald Cron | ce7d76e | 2022-07-08 18:56:49 +0200 | [diff] [blame] | 1717 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | 75fe8c7 | 2022-06-15 09:42:45 +0000 | [diff] [blame] | 1718 | static int ssl_tls13_postprocess_client_hello( mbedtls_ssl_context* ssl ) |
| 1719 | { |
| 1720 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 1721 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1722 | /* |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1723 | * Server certificate selection |
| 1724 | */ |
| 1725 | if( ssl->conf->f_cert_cb && ( ret = ssl->conf->f_cert_cb( ssl ) ) != 0 ) |
| 1726 | { |
| 1727 | MBEDTLS_SSL_DEBUG_RET( 1, "f_cert_cb", ret ); |
| 1728 | return( ret ); |
| 1729 | } |
| 1730 | #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
| 1731 | ssl->handshake->sni_name = NULL; |
| 1732 | ssl->handshake->sni_name_len = 0; |
| 1733 | #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1734 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1735 | ret = mbedtls_ssl_tls13_key_schedule_stage_early( ssl ); |
| 1736 | if( ret != 0 ) |
| 1737 | { |
| 1738 | MBEDTLS_SSL_DEBUG_RET( 1, |
| 1739 | "mbedtls_ssl_tls1_3_key_schedule_stage_early", ret ); |
| 1740 | return( ret ); |
| 1741 | } |
| 1742 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1743 | return( 0 ); |
| 1744 | |
| 1745 | } |
| 1746 | |
| 1747 | /* |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1748 | * Main entry point from the state machine; orchestrates the otherfunctions. |
| 1749 | */ |
| 1750 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1751 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1752 | static int ssl_tls13_process_client_hello( mbedtls_ssl_context *ssl ) |
| 1753 | { |
| 1754 | |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 1755 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1756 | unsigned char* buf = NULL; |
| 1757 | size_t buflen = 0; |
Jerry Yu | 4ca9140 | 2022-05-09 15:50:57 +0800 | [diff] [blame] | 1758 | int parse_client_hello_ret; |
| 1759 | |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1760 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello" ) ); |
| 1761 | |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1762 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_tls13_fetch_handshake_msg( |
| 1763 | ssl, MBEDTLS_SSL_HS_CLIENT_HELLO, |
| 1764 | &buf, &buflen ) ); |
| 1765 | |
| 1766 | MBEDTLS_SSL_PROC_CHK_NEG( ssl_tls13_parse_client_hello( ssl, buf, |
| 1767 | buf + buflen ) ); |
Jerry Yu | f41553b | 2022-05-09 22:20:30 +0800 | [diff] [blame] | 1768 | parse_client_hello_ret = ret; /* Store return value of parse_client_hello, |
| 1769 | * only SSL_CLIENT_HELLO_OK or |
| 1770 | * SSL_CLIENT_HELLO_HRR_REQUIRED at this |
| 1771 | * stage as negative error codes are handled |
| 1772 | * by MBEDTLS_SSL_PROC_CHK_NEG. */ |
Jerry Yu | 4ca9140 | 2022-05-09 15:50:57 +0800 | [diff] [blame] | 1773 | |
XiaokangQian | cfd925f | 2022-04-14 07:10:37 +0000 | [diff] [blame] | 1774 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_postprocess_client_hello( ssl ) ); |
Jerry Yu | 582dd06 | 2022-04-22 21:59:01 +0800 | [diff] [blame] | 1775 | |
Jerry Yu | 4ca9140 | 2022-05-09 15:50:57 +0800 | [diff] [blame] | 1776 | if( parse_client_hello_ret == SSL_CLIENT_HELLO_OK ) |
| 1777 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_SERVER_HELLO ); |
| 1778 | else |
| 1779 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_HELLO_RETRY_REQUEST ); |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1780 | |
| 1781 | cleanup: |
| 1782 | |
| 1783 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello" ) ); |
| 1784 | return( ret ); |
| 1785 | } |
| 1786 | |
| 1787 | /* |
Jerry Yu | 1c3e688 | 2022-04-20 21:23:40 +0800 | [diff] [blame] | 1788 | * Handler for MBEDTLS_SSL_SERVER_HELLO |
Jerry Yu | 5b64ae9 | 2022-03-30 17:15:02 +0800 | [diff] [blame] | 1789 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1790 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1791 | static int ssl_tls13_prepare_server_hello( mbedtls_ssl_context *ssl ) |
| 1792 | { |
Jerry Yu | 637a3f1 | 2022-04-20 21:37:58 +0800 | [diff] [blame] | 1793 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 1794 | unsigned char *server_randbytes = |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1795 | ssl->handshake->randbytes + MBEDTLS_CLIENT_HELLO_RANDOM_LEN; |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1796 | if( ssl->conf->f_rng == NULL ) |
| 1797 | { |
| 1798 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "no RNG provided" ) ); |
| 1799 | return( MBEDTLS_ERR_SSL_NO_RNG ); |
| 1800 | } |
| 1801 | |
Jerry Yu | 637a3f1 | 2022-04-20 21:37:58 +0800 | [diff] [blame] | 1802 | if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, server_randbytes, |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1803 | MBEDTLS_SERVER_HELLO_RANDOM_LEN ) ) != 0 ) |
| 1804 | { |
| 1805 | MBEDTLS_SSL_DEBUG_RET( 1, "f_rng", ret ); |
| 1806 | return( ret ); |
| 1807 | } |
| 1808 | |
Jerry Yu | 637a3f1 | 2022-04-20 21:37:58 +0800 | [diff] [blame] | 1809 | MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", server_randbytes, |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1810 | MBEDTLS_SERVER_HELLO_RANDOM_LEN ); |
| 1811 | |
| 1812 | #if defined(MBEDTLS_HAVE_TIME) |
| 1813 | ssl->session_negotiate->start = time( NULL ); |
| 1814 | #endif /* MBEDTLS_HAVE_TIME */ |
| 1815 | |
| 1816 | return( ret ); |
| 1817 | } |
| 1818 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1819 | /* |
Jerry Yu | e74e04a | 2022-04-21 09:23:16 +0800 | [diff] [blame] | 1820 | * ssl_tls13_write_server_hello_supported_versions_ext (): |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1821 | * |
| 1822 | * struct { |
Jerry Yu | fb9f54d | 2022-04-06 10:08:34 +0800 | [diff] [blame] | 1823 | * ProtocolVersion selected_version; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1824 | * } SupportedVersions; |
| 1825 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1826 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | e74e04a | 2022-04-21 09:23:16 +0800 | [diff] [blame] | 1827 | static int ssl_tls13_write_server_hello_supported_versions_ext( |
| 1828 | mbedtls_ssl_context *ssl, |
| 1829 | unsigned char *buf, |
| 1830 | unsigned char *end, |
| 1831 | size_t *out_len ) |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1832 | { |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1833 | *out_len = 0; |
| 1834 | |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1835 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, write selected version" ) ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1836 | |
| 1837 | /* Check if we have space to write the extension: |
| 1838 | * - extension_type (2 bytes) |
| 1839 | * - extension_data_length (2 bytes) |
Jerry Yu | 349a613 | 2022-04-14 20:52:56 +0800 | [diff] [blame] | 1840 | * - selected_version (2 bytes) |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1841 | */ |
Jerry Yu | 349a613 | 2022-04-14 20:52:56 +0800 | [diff] [blame] | 1842 | MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 6 ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1843 | |
Jerry Yu | 349a613 | 2022-04-14 20:52:56 +0800 | [diff] [blame] | 1844 | MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS, buf, 0 ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1845 | |
Jerry Yu | 349a613 | 2022-04-14 20:52:56 +0800 | [diff] [blame] | 1846 | MBEDTLS_PUT_UINT16_BE( 2, buf, 2 ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1847 | |
Jerry Yu | 349a613 | 2022-04-14 20:52:56 +0800 | [diff] [blame] | 1848 | mbedtls_ssl_write_version( buf + 4, |
| 1849 | ssl->conf->transport, |
| 1850 | ssl->tls_version ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1851 | |
| 1852 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "supported version: [%04x]", |
| 1853 | ssl->tls_version ) ); |
| 1854 | |
Jerry Yu | 349a613 | 2022-04-14 20:52:56 +0800 | [diff] [blame] | 1855 | *out_len = 6; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1856 | |
| 1857 | return( 0 ); |
| 1858 | } |
| 1859 | |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 1860 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1861 | |
| 1862 | /* Generate and export a single key share. For hybrid KEMs, this can |
| 1863 | * be called multiple times with the different components of the hybrid. */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1864 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1865 | static int ssl_tls13_generate_and_write_key_share( mbedtls_ssl_context *ssl, |
| 1866 | uint16_t named_group, |
| 1867 | unsigned char *buf, |
| 1868 | unsigned char *end, |
| 1869 | size_t *out_len ) |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1870 | { |
| 1871 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1872 | |
| 1873 | *out_len = 0; |
| 1874 | |
Jerry Yu | 89e103c | 2022-03-30 22:43:29 +0800 | [diff] [blame] | 1875 | #if defined(MBEDTLS_ECDH_C) |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1876 | if( mbedtls_ssl_tls13_named_group_is_ecdhe( named_group ) ) |
| 1877 | { |
Jerry Yu | 89e103c | 2022-03-30 22:43:29 +0800 | [diff] [blame] | 1878 | ret = mbedtls_ssl_tls13_generate_and_write_ecdh_key_exchange( |
| 1879 | ssl, named_group, buf, end, out_len ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1880 | if( ret != 0 ) |
| 1881 | { |
Jerry Yu | 89e103c | 2022-03-30 22:43:29 +0800 | [diff] [blame] | 1882 | MBEDTLS_SSL_DEBUG_RET( |
| 1883 | 1, "mbedtls_ssl_tls13_generate_and_write_ecdh_key_exchange", |
| 1884 | ret ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1885 | return( ret ); |
| 1886 | } |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1887 | } |
Jerry Yu | 89e103c | 2022-03-30 22:43:29 +0800 | [diff] [blame] | 1888 | else |
| 1889 | #endif /* MBEDTLS_ECDH_C */ |
| 1890 | if( 0 /* Other kinds of KEMs */ ) |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1891 | { |
| 1892 | } |
| 1893 | else |
| 1894 | { |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1895 | ((void) ssl); |
| 1896 | ((void) named_group); |
| 1897 | ((void) buf); |
| 1898 | ((void) end); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1899 | ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; |
| 1900 | } |
| 1901 | |
| 1902 | return( ret ); |
| 1903 | } |
| 1904 | |
| 1905 | /* |
| 1906 | * ssl_tls13_write_key_share_ext |
| 1907 | * |
| 1908 | * Structure of key_share extension in ServerHello: |
| 1909 | * |
Jerry Yu | 1c3e688 | 2022-04-20 21:23:40 +0800 | [diff] [blame] | 1910 | * struct { |
| 1911 | * NamedGroup group; |
| 1912 | * opaque key_exchange<1..2^16-1>; |
| 1913 | * } KeyShareEntry; |
| 1914 | * struct { |
| 1915 | * KeyShareEntry server_share; |
| 1916 | * } KeyShareServerHello; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1917 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1918 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1919 | static int ssl_tls13_write_key_share_ext( mbedtls_ssl_context *ssl, |
| 1920 | unsigned char *buf, |
| 1921 | unsigned char *end, |
| 1922 | size_t *out_len ) |
| 1923 | { |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1924 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1925 | unsigned char *p = buf; |
Jerry Yu | 57d4841 | 2022-04-20 21:50:42 +0800 | [diff] [blame] | 1926 | uint16_t group = ssl->handshake->offered_group_id; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1927 | unsigned char *server_share = buf + 4; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1928 | size_t key_exchange_length; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1929 | |
| 1930 | *out_len = 0; |
| 1931 | |
| 1932 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding key share extension" ) ); |
| 1933 | |
Jerry Yu | 58af233 | 2022-09-06 11:19:31 +0800 | [diff] [blame] | 1934 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "server hello, write selected_group: %s (%04x)", |
| 1935 | mbedtls_ssl_named_group_to_str( group ), |
| 1936 | group ) ); |
| 1937 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1938 | /* Check if we have space for header and length fields: |
| 1939 | * - extension_type (2 bytes) |
| 1940 | * - extension_data_length (2 bytes) |
| 1941 | * - group (2 bytes) |
| 1942 | * - key_exchange_length (2 bytes) |
| 1943 | */ |
| 1944 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 8 ); |
Jerry Yu | 57d4841 | 2022-04-20 21:50:42 +0800 | [diff] [blame] | 1945 | MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_KEY_SHARE, p, 0 ); |
| 1946 | MBEDTLS_PUT_UINT16_BE( group, server_share, 0 ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1947 | p += 8; |
Jerry Yu | 57d4841 | 2022-04-20 21:50:42 +0800 | [diff] [blame] | 1948 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1949 | /* When we introduce PQC-ECDHE hybrids, we'll want to call this |
| 1950 | * function multiple times. */ |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1951 | ret = ssl_tls13_generate_and_write_key_share( |
Jerry Yu | e65d801 | 2022-04-23 10:34:35 +0800 | [diff] [blame] | 1952 | ssl, group, server_share + 4, end, &key_exchange_length ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1953 | if( ret != 0 ) |
| 1954 | return( ret ); |
| 1955 | p += key_exchange_length; |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1956 | |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1957 | MBEDTLS_PUT_UINT16_BE( key_exchange_length, server_share + 2, 0 ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1958 | |
Jerry Yu | 57d4841 | 2022-04-20 21:50:42 +0800 | [diff] [blame] | 1959 | MBEDTLS_PUT_UINT16_BE( p - server_share, buf, 2 ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1960 | |
Jerry Yu | 57d4841 | 2022-04-20 21:50:42 +0800 | [diff] [blame] | 1961 | *out_len = p - buf; |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1962 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1963 | return( 0 ); |
| 1964 | } |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 1965 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1966 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1967 | static int ssl_tls13_write_hrr_key_share_ext( mbedtls_ssl_context *ssl, |
| 1968 | unsigned char *buf, |
| 1969 | unsigned char *end, |
| 1970 | size_t *out_len ) |
| 1971 | { |
| 1972 | uint16_t selected_group = ssl->handshake->hrr_selected_group; |
| 1973 | /* key_share Extension |
| 1974 | * |
| 1975 | * struct { |
| 1976 | * select (Handshake.msg_type) { |
| 1977 | * ... |
| 1978 | * case hello_retry_request: |
| 1979 | * NamedGroup selected_group; |
| 1980 | * ... |
| 1981 | * }; |
| 1982 | * } KeyShare; |
| 1983 | */ |
| 1984 | |
| 1985 | *out_len = 0; |
| 1986 | |
Jerry Yu | b0ac10b | 2022-05-05 11:10:08 +0800 | [diff] [blame] | 1987 | /* |
| 1988 | * For a pure PSK key exchange, there is no group to agree upon. The purpose |
| 1989 | * of the HRR is then to transmit a cookie to force the client to demonstrate |
| 1990 | * reachability at their apparent network address (primarily useful for DTLS). |
| 1991 | */ |
Ronald Cron | 7990771 | 2022-07-20 17:05:29 +0200 | [diff] [blame] | 1992 | if( ! mbedtls_ssl_tls13_key_exchange_mode_with_ephemeral( ssl ) ) |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1993 | return( 0 ); |
| 1994 | |
| 1995 | /* We should only send the key_share extension if the client's initial |
| 1996 | * key share was not acceptable. */ |
| 1997 | if( ssl->handshake->offered_group_id != 0 ) |
| 1998 | { |
| 1999 | MBEDTLS_SSL_DEBUG_MSG( 4, ( "Skip key_share extension in HRR" ) ); |
| 2000 | return( 0 ); |
| 2001 | } |
| 2002 | |
| 2003 | if( selected_group == 0 ) |
| 2004 | { |
| 2005 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "no matching named group found" ) ); |
| 2006 | return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 2007 | } |
| 2008 | |
Jerry Yu | b0ac10b | 2022-05-05 11:10:08 +0800 | [diff] [blame] | 2009 | /* Check if we have enough space: |
| 2010 | * - extension_type (2 bytes) |
| 2011 | * - extension_data_length (2 bytes) |
| 2012 | * - selected_group (2 bytes) |
| 2013 | */ |
Ronald Cron | 154d1b6 | 2022-06-01 15:33:26 +0200 | [diff] [blame] | 2014 | MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 6 ); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 2015 | |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 2016 | MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_KEY_SHARE, buf, 0 ); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 2017 | MBEDTLS_PUT_UINT16_BE( 2, buf, 2 ); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 2018 | MBEDTLS_PUT_UINT16_BE( selected_group, buf, 4 ); |
| 2019 | |
| 2020 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 2021 | ( "HRR selected_group: %s (%x)", |
| 2022 | mbedtls_ssl_named_group_to_str( selected_group ), |
| 2023 | selected_group ) ); |
| 2024 | |
| 2025 | *out_len = 6; |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 2026 | |
Jerry Yu | b0ac10b | 2022-05-05 11:10:08 +0800 | [diff] [blame] | 2027 | return( 0 ); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 2028 | } |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2029 | |
| 2030 | /* |
| 2031 | * Structure of ServerHello message: |
| 2032 | * |
| 2033 | * struct { |
| 2034 | * ProtocolVersion legacy_version = 0x0303; // TLS v1.2 |
| 2035 | * Random random; |
| 2036 | * opaque legacy_session_id_echo<0..32>; |
| 2037 | * CipherSuite cipher_suite; |
| 2038 | * uint8 legacy_compression_method = 0; |
| 2039 | * Extension extensions<6..2^16-1>; |
| 2040 | * } ServerHello; |
| 2041 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2042 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2043 | static int ssl_tls13_write_server_hello_body( mbedtls_ssl_context *ssl, |
Jerry Yu | 56404d7 | 2022-03-30 17:36:13 +0800 | [diff] [blame] | 2044 | unsigned char *buf, |
| 2045 | unsigned char *end, |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 2046 | size_t *out_len, |
| 2047 | int is_hrr ) |
Jerry Yu | 56404d7 | 2022-03-30 17:36:13 +0800 | [diff] [blame] | 2048 | { |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 2049 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2050 | unsigned char *p = buf; |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 2051 | unsigned char *p_extensions_len; |
Jerry Yu | fbe3e64 | 2022-04-25 19:31:51 +0800 | [diff] [blame] | 2052 | size_t output_len; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2053 | |
| 2054 | *out_len = 0; |
| 2055 | |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 2056 | /* ... |
| 2057 | * ProtocolVersion legacy_version = 0x0303; // TLS 1.2 |
| 2058 | * ... |
| 2059 | * with ProtocolVersion defined as: |
| 2060 | * uint16 ProtocolVersion; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2061 | */ |
| 2062 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 ); |
| 2063 | MBEDTLS_PUT_UINT16_BE( 0x0303, p, 0 ); |
| 2064 | p += 2; |
| 2065 | |
Jerry Yu | 1c3e688 | 2022-04-20 21:23:40 +0800 | [diff] [blame] | 2066 | /* ... |
| 2067 | * Random random; |
| 2068 | * ... |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 2069 | * with Random defined as: |
| 2070 | * opaque Random[MBEDTLS_SERVER_HELLO_RANDOM_LEN]; |
Jerry Yu | 1c3e688 | 2022-04-20 21:23:40 +0800 | [diff] [blame] | 2071 | */ |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2072 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, MBEDTLS_SERVER_HELLO_RANDOM_LEN ); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 2073 | if( is_hrr ) |
| 2074 | { |
| 2075 | memcpy( p, mbedtls_ssl_tls13_hello_retry_request_magic, |
Jerry Yu | fbe3e64 | 2022-04-25 19:31:51 +0800 | [diff] [blame] | 2076 | MBEDTLS_SERVER_HELLO_RANDOM_LEN ); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 2077 | } |
| 2078 | else |
| 2079 | { |
| 2080 | memcpy( p, &ssl->handshake->randbytes[MBEDTLS_CLIENT_HELLO_RANDOM_LEN], |
Jerry Yu | fbe3e64 | 2022-04-25 19:31:51 +0800 | [diff] [blame] | 2081 | MBEDTLS_SERVER_HELLO_RANDOM_LEN ); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 2082 | } |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 2083 | MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2084 | p, MBEDTLS_SERVER_HELLO_RANDOM_LEN ); |
| 2085 | p += MBEDTLS_SERVER_HELLO_RANDOM_LEN; |
| 2086 | |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 2087 | /* ... |
| 2088 | * opaque legacy_session_id_echo<0..32>; |
| 2089 | * ... |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2090 | */ |
| 2091 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 1 + ssl->session_negotiate->id_len ); |
| 2092 | *p++ = (unsigned char)ssl->session_negotiate->id_len; |
| 2093 | if( ssl->session_negotiate->id_len > 0 ) |
| 2094 | { |
| 2095 | memcpy( p, &ssl->session_negotiate->id[0], |
| 2096 | ssl->session_negotiate->id_len ); |
| 2097 | p += ssl->session_negotiate->id_len; |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 2098 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2099 | MBEDTLS_SSL_DEBUG_BUF( 3, "session id", ssl->session_negotiate->id, |
| 2100 | ssl->session_negotiate->id_len ); |
| 2101 | } |
| 2102 | |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 2103 | /* ... |
| 2104 | * CipherSuite cipher_suite; |
| 2105 | * ... |
| 2106 | * with CipherSuite defined as: |
| 2107 | * uint8 CipherSuite[2]; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2108 | */ |
| 2109 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 ); |
| 2110 | MBEDTLS_PUT_UINT16_BE( ssl->session_negotiate->ciphersuite, p, 0 ); |
| 2111 | p += 2; |
| 2112 | MBEDTLS_SSL_DEBUG_MSG( 3, |
| 2113 | ( "server hello, chosen ciphersuite: %s ( id=%d )", |
| 2114 | mbedtls_ssl_get_ciphersuite_name( |
| 2115 | ssl->session_negotiate->ciphersuite ), |
| 2116 | ssl->session_negotiate->ciphersuite ) ); |
| 2117 | |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 2118 | /* ... |
| 2119 | * uint8 legacy_compression_method = 0; |
| 2120 | * ... |
| 2121 | */ |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2122 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 1 ); |
Thomas Daubney | 31e03a8 | 2022-07-25 15:59:25 +0100 | [diff] [blame] | 2123 | *p++ = MBEDTLS_SSL_COMPRESS_NULL; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2124 | |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 2125 | /* ... |
| 2126 | * Extension extensions<6..2^16-1>; |
| 2127 | * ... |
| 2128 | * struct { |
| 2129 | * ExtensionType extension_type; (2 bytes) |
| 2130 | * opaque extension_data<0..2^16-1>; |
| 2131 | * } Extension; |
| 2132 | */ |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2133 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 ); |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 2134 | p_extensions_len = p; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2135 | p += 2; |
| 2136 | |
Jerry Yu | e74e04a | 2022-04-21 09:23:16 +0800 | [diff] [blame] | 2137 | if( ( ret = ssl_tls13_write_server_hello_supported_versions_ext( |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2138 | ssl, p, end, &output_len ) ) != 0 ) |
| 2139 | { |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 2140 | MBEDTLS_SSL_DEBUG_RET( |
| 2141 | 1, "ssl_tls13_write_server_hello_supported_versions_ext", ret ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2142 | return( ret ); |
| 2143 | } |
| 2144 | p += output_len; |
| 2145 | |
Jerry Yu | 56acc94 | 2022-07-30 23:02:36 +0800 | [diff] [blame] | 2146 | if( mbedtls_ssl_tls13_key_exchange_mode_with_ephemeral( ssl ) ) |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2147 | { |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 2148 | if( is_hrr ) |
| 2149 | ret = ssl_tls13_write_hrr_key_share_ext( ssl, p, end, &output_len ); |
| 2150 | else |
| 2151 | ret = ssl_tls13_write_key_share_ext( ssl, p, end, &output_len ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2152 | if( ret != 0 ) |
| 2153 | return( ret ); |
| 2154 | p += output_len; |
| 2155 | } |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2156 | |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 2157 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
Jerry Yu | ad4d2bb | 2022-09-14 22:40:35 +0800 | [diff] [blame] | 2158 | if( !is_hrr && mbedtls_ssl_tls13_key_exchange_mode_with_psk( ssl ) ) |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 2159 | { |
Jerry Yu | bb85202 | 2022-07-20 21:10:44 +0800 | [diff] [blame] | 2160 | 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] | 2161 | if( ret != 0 ) |
| 2162 | { |
Jerry Yu | bb85202 | 2022-07-20 21:10:44 +0800 | [diff] [blame] | 2163 | 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] | 2164 | ret ); |
| 2165 | return( ret ); |
| 2166 | } |
| 2167 | p += output_len; |
| 2168 | } |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 2169 | #endif |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 2170 | |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 2171 | 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] | 2172 | |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 2173 | MBEDTLS_SSL_DEBUG_BUF( 4, "server hello extensions", |
| 2174 | p_extensions_len, p - p_extensions_len ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2175 | |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 2176 | *out_len = p - buf; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2177 | |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 2178 | MBEDTLS_SSL_DEBUG_BUF( 3, "server hello", buf, *out_len ); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2179 | |
| 2180 | return( ret ); |
Jerry Yu | 56404d7 | 2022-03-30 17:36:13 +0800 | [diff] [blame] | 2181 | } |
| 2182 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2183 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | e110d25 | 2022-05-05 10:19:22 +0800 | [diff] [blame] | 2184 | static int ssl_tls13_finalize_write_server_hello( mbedtls_ssl_context *ssl ) |
| 2185 | { |
| 2186 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | f86eb75 | 2022-05-06 11:16:55 +0800 | [diff] [blame] | 2187 | ret = mbedtls_ssl_tls13_compute_handshake_transform( ssl ); |
Jerry Yu | e110d25 | 2022-05-05 10:19:22 +0800 | [diff] [blame] | 2188 | if( ret != 0 ) |
| 2189 | { |
Jerry Yu | f86eb75 | 2022-05-06 11:16:55 +0800 | [diff] [blame] | 2190 | MBEDTLS_SSL_DEBUG_RET( 1, |
| 2191 | "mbedtls_ssl_tls13_compute_handshake_transform", |
Jerry Yu | e110d25 | 2022-05-05 10:19:22 +0800 | [diff] [blame] | 2192 | ret ); |
| 2193 | return( ret ); |
| 2194 | } |
| 2195 | |
Jerry Yu | e110d25 | 2022-05-05 10:19:22 +0800 | [diff] [blame] | 2196 | return( ret ); |
| 2197 | } |
| 2198 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2199 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 5b64ae9 | 2022-03-30 17:15:02 +0800 | [diff] [blame] | 2200 | static int ssl_tls13_write_server_hello( mbedtls_ssl_context *ssl ) |
| 2201 | { |
Jerry Yu | 637a3f1 | 2022-04-20 21:37:58 +0800 | [diff] [blame] | 2202 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 2203 | unsigned char *buf; |
| 2204 | size_t buf_len, msg_len; |
| 2205 | |
| 2206 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server hello" ) ); |
| 2207 | |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 2208 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_prepare_server_hello( ssl ) ); |
| 2209 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2210 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_start_handshake_msg( ssl, |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 2211 | MBEDTLS_SSL_HS_SERVER_HELLO, &buf, &buf_len ) ); |
| 2212 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2213 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_server_hello_body( ssl, buf, |
| 2214 | buf + buf_len, |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 2215 | &msg_len, |
| 2216 | 0 ) ); |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 2217 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2218 | mbedtls_ssl_add_hs_msg_to_checksum( |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 2219 | ssl, MBEDTLS_SSL_HS_SERVER_HELLO, buf, msg_len ); |
| 2220 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2221 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_finish_handshake_msg( |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 2222 | ssl, buf_len, msg_len ) ); |
Jerry Yu | 637a3f1 | 2022-04-20 21:37:58 +0800 | [diff] [blame] | 2223 | |
Jerry Yu | e110d25 | 2022-05-05 10:19:22 +0800 | [diff] [blame] | 2224 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_finalize_write_server_hello( ssl ) ); |
| 2225 | |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 2226 | #if defined(MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE) |
| 2227 | /* The server sends a dummy change_cipher_spec record immediately |
| 2228 | * after its first handshake message. This may either be after |
| 2229 | * a ServerHello or a HelloRetryRequest. |
| 2230 | */ |
Gabor Mezei | 96ae926 | 2022-06-28 11:45:18 +0200 | [diff] [blame] | 2231 | mbedtls_ssl_handshake_set_state( |
| 2232 | ssl, MBEDTLS_SSL_SERVER_CCS_AFTER_SERVER_HELLO ); |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 2233 | #else |
Jerry Yu | 637a3f1 | 2022-04-20 21:37:58 +0800 | [diff] [blame] | 2234 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_ENCRYPTED_EXTENSIONS ); |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 2235 | #endif /* MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE */ |
Jerry Yu | e110d25 | 2022-05-05 10:19:22 +0800 | [diff] [blame] | 2236 | |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 2237 | cleanup: |
| 2238 | |
| 2239 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello" ) ); |
| 2240 | return( ret ); |
Jerry Yu | 5b64ae9 | 2022-03-30 17:15:02 +0800 | [diff] [blame] | 2241 | } |
| 2242 | |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2243 | |
| 2244 | /* |
| 2245 | * Handler for MBEDTLS_SSL_HELLO_RETRY_REQUEST |
| 2246 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2247 | MBEDTLS_CHECK_RETURN_CRITICAL |
Ronald Cron | 7b84046 | 2022-06-01 17:05:53 +0200 | [diff] [blame] | 2248 | static int ssl_tls13_prepare_hello_retry_request( mbedtls_ssl_context *ssl ) |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2249 | { |
| 2250 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2251 | if( ssl->handshake->hello_retry_request_count > 0 ) |
| 2252 | { |
| 2253 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "Too many HRRs" ) ); |
| 2254 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE, |
| 2255 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 2256 | return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 2257 | } |
| 2258 | |
| 2259 | /* |
| 2260 | * Create stateless transcript hash for HRR |
| 2261 | */ |
| 2262 | MBEDTLS_SSL_DEBUG_MSG( 4, ( "Reset transcript for HRR" ) ); |
| 2263 | ret = mbedtls_ssl_reset_transcript_for_hrr( ssl ); |
| 2264 | if( ret != 0 ) |
| 2265 | { |
| 2266 | MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_reset_transcript_for_hrr", ret ); |
| 2267 | return( ret ); |
| 2268 | } |
| 2269 | mbedtls_ssl_session_reset_msg_layer( ssl, 0 ); |
| 2270 | |
| 2271 | return( 0 ); |
| 2272 | } |
| 2273 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2274 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2275 | static int ssl_tls13_write_hello_retry_request( mbedtls_ssl_context *ssl ) |
| 2276 | { |
| 2277 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2278 | unsigned char *buf; |
| 2279 | size_t buf_len, msg_len; |
| 2280 | |
| 2281 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello retry request" ) ); |
| 2282 | |
Ronald Cron | 7b84046 | 2022-06-01 17:05:53 +0200 | [diff] [blame] | 2283 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_prepare_hello_retry_request( ssl ) ); |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2284 | |
| 2285 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_start_handshake_msg( |
| 2286 | ssl, MBEDTLS_SSL_HS_SERVER_HELLO, |
| 2287 | &buf, &buf_len ) ); |
| 2288 | |
| 2289 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_server_hello_body( ssl, buf, |
| 2290 | buf + buf_len, |
| 2291 | &msg_len, |
| 2292 | 1 ) ); |
| 2293 | mbedtls_ssl_add_hs_msg_to_checksum( |
| 2294 | ssl, MBEDTLS_SSL_HS_SERVER_HELLO, buf, msg_len ); |
| 2295 | |
| 2296 | |
| 2297 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_finish_handshake_msg( ssl, buf_len, |
| 2298 | msg_len ) ); |
| 2299 | |
| 2300 | ssl->handshake->hello_retry_request_count++; |
| 2301 | |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 2302 | #if defined(MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE) |
| 2303 | /* The server sends a dummy change_cipher_spec record immediately |
| 2304 | * after its first handshake message. This may either be after |
| 2305 | * a ServerHello or a HelloRetryRequest. |
| 2306 | */ |
Gabor Mezei | 96ae926 | 2022-06-28 11:45:18 +0200 | [diff] [blame] | 2307 | mbedtls_ssl_handshake_set_state( |
Gabor Mezei | f7044ea | 2022-06-28 16:01:49 +0200 | [diff] [blame] | 2308 | ssl, MBEDTLS_SSL_SERVER_CCS_AFTER_HELLO_RETRY_REQUEST ); |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 2309 | #else |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2310 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CLIENT_HELLO ); |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 2311 | #endif /* MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE */ |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2312 | |
| 2313 | cleanup: |
| 2314 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello retry request" ) ); |
| 2315 | return( ret ); |
| 2316 | } |
| 2317 | |
Jerry Yu | 5b64ae9 | 2022-03-30 17:15:02 +0800 | [diff] [blame] | 2318 | /* |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2319 | * Handler for MBEDTLS_SSL_ENCRYPTED_EXTENSIONS |
| 2320 | */ |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2321 | |
| 2322 | /* |
| 2323 | * struct { |
| 2324 | * Extension extensions<0..2 ^ 16 - 1>; |
| 2325 | * } EncryptedExtensions; |
| 2326 | * |
| 2327 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2328 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2329 | static int ssl_tls13_write_encrypted_extensions_body( mbedtls_ssl_context *ssl, |
| 2330 | unsigned char *buf, |
| 2331 | unsigned char *end, |
| 2332 | size_t *out_len ) |
| 2333 | { |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 2334 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2335 | unsigned char *p = buf; |
| 2336 | size_t extensions_len = 0; |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2337 | unsigned char *p_extensions_len; |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 2338 | size_t output_len; |
Jerry Yu | 9da5e5a | 2022-05-03 15:46:09 +0800 | [diff] [blame] | 2339 | |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2340 | *out_len = 0; |
| 2341 | |
| 2342 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 ); |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2343 | p_extensions_len = p; |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2344 | p += 2; |
| 2345 | |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2346 | ((void) ssl); |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 2347 | ((void) ret); |
| 2348 | ((void) output_len); |
| 2349 | |
| 2350 | #if defined(MBEDTLS_SSL_ALPN) |
| 2351 | ret = mbedtls_ssl_write_alpn_ext( ssl, p, end, &output_len ); |
| 2352 | if( ret != 0 ) |
| 2353 | return( ret ); |
XiaokangQian | 95d5f54 | 2022-06-24 02:29:26 +0000 | [diff] [blame] | 2354 | p += output_len; |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 2355 | #endif /* MBEDTLS_SSL_ALPN */ |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2356 | |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2357 | extensions_len = ( p - p_extensions_len ) - 2; |
| 2358 | MBEDTLS_PUT_UINT16_BE( extensions_len, p_extensions_len, 0 ); |
| 2359 | |
| 2360 | *out_len = p - buf; |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2361 | |
| 2362 | MBEDTLS_SSL_DEBUG_BUF( 4, "encrypted extensions", buf, *out_len ); |
| 2363 | |
| 2364 | return( 0 ); |
| 2365 | } |
| 2366 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2367 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2368 | static int ssl_tls13_write_encrypted_extensions( mbedtls_ssl_context *ssl ) |
| 2369 | { |
| 2370 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2371 | unsigned char *buf; |
Jerry Yu | 39730a7 | 2022-05-03 12:14:04 +0800 | [diff] [blame] | 2372 | size_t buf_len, msg_len; |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2373 | |
Gabor Mezei | 5471912 | 2022-06-28 11:34:56 +0200 | [diff] [blame] | 2374 | mbedtls_ssl_set_outbound_transform( ssl, |
| 2375 | ssl->handshake->transform_handshake ); |
| 2376 | MBEDTLS_SSL_DEBUG_MSG( |
| 2377 | 3, ( "switching to handshake transform for outbound data" ) ); |
| 2378 | |
Jerry Yu | ab452cc | 2022-04-28 15:27:08 +0800 | [diff] [blame] | 2379 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write encrypted extensions" ) ); |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2380 | |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2381 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_start_handshake_msg( ssl, |
| 2382 | MBEDTLS_SSL_HS_ENCRYPTED_EXTENSIONS, &buf, &buf_len ) ); |
| 2383 | |
| 2384 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_encrypted_extensions_body( |
| 2385 | ssl, buf, buf + buf_len, &msg_len ) ); |
| 2386 | |
| 2387 | mbedtls_ssl_add_hs_msg_to_checksum( |
| 2388 | ssl, MBEDTLS_SSL_HS_ENCRYPTED_EXTENSIONS, buf, msg_len ); |
| 2389 | |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2390 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_finish_handshake_msg( |
| 2391 | ssl, buf_len, msg_len ) ); |
| 2392 | |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 2393 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED) |
Ronald Cron | 7990771 | 2022-07-20 17:05:29 +0200 | [diff] [blame] | 2394 | if( mbedtls_ssl_tls13_key_exchange_mode_with_psk( ssl ) ) |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2395 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_SERVER_FINISHED ); |
| 2396 | else |
XiaokangQian | a987e1d | 2022-05-07 01:25:58 +0000 | [diff] [blame] | 2397 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CERTIFICATE_REQUEST ); |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2398 | #else |
| 2399 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_SERVER_FINISHED ); |
| 2400 | #endif |
| 2401 | |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2402 | cleanup: |
| 2403 | |
Jerry Yu | ab452cc | 2022-04-28 15:27:08 +0800 | [diff] [blame] | 2404 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write encrypted extensions" ) ); |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2405 | return( ret ); |
| 2406 | } |
| 2407 | |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 2408 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED) |
XiaokangQian | a987e1d | 2022-05-07 01:25:58 +0000 | [diff] [blame] | 2409 | #define SSL_CERTIFICATE_REQUEST_SEND_REQUEST 0 |
| 2410 | #define SSL_CERTIFICATE_REQUEST_SKIP 1 |
| 2411 | /* Coordination: |
| 2412 | * Check whether a CertificateRequest message should be written. |
| 2413 | * Returns a negative code on failure, or |
| 2414 | * - SSL_CERTIFICATE_REQUEST_SEND_REQUEST |
| 2415 | * - SSL_CERTIFICATE_REQUEST_SKIP |
| 2416 | * indicating if the writing of the CertificateRequest |
| 2417 | * should be skipped or not. |
| 2418 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2419 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | a987e1d | 2022-05-07 01:25:58 +0000 | [diff] [blame] | 2420 | static int ssl_tls13_certificate_request_coordinate( mbedtls_ssl_context *ssl ) |
| 2421 | { |
| 2422 | int authmode; |
| 2423 | |
XiaokangQian | 40a3523 | 2022-05-07 09:02:40 +0000 | [diff] [blame] | 2424 | #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
| 2425 | if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET ) |
| 2426 | authmode = ssl->handshake->sni_authmode; |
| 2427 | else |
| 2428 | #endif |
XiaokangQian | a987e1d | 2022-05-07 01:25:58 +0000 | [diff] [blame] | 2429 | authmode = ssl->conf->authmode; |
| 2430 | |
| 2431 | if( authmode == MBEDTLS_SSL_VERIFY_NONE ) |
Ronald Cron | eac00ad | 2022-09-13 10:16:31 +0200 | [diff] [blame^] | 2432 | { |
| 2433 | ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_SKIP_VERIFY; |
XiaokangQian | a987e1d | 2022-05-07 01:25:58 +0000 | [diff] [blame] | 2434 | return( SSL_CERTIFICATE_REQUEST_SKIP ); |
Ronald Cron | eac00ad | 2022-09-13 10:16:31 +0200 | [diff] [blame^] | 2435 | } |
XiaokangQian | a987e1d | 2022-05-07 01:25:58 +0000 | [diff] [blame] | 2436 | |
XiaokangQian | c3017f6 | 2022-05-13 05:55:41 +0000 | [diff] [blame] | 2437 | ssl->handshake->certificate_request_sent = 1; |
XiaokangQian | 189ded2 | 2022-05-10 08:12:17 +0000 | [diff] [blame] | 2438 | |
XiaokangQian | a987e1d | 2022-05-07 01:25:58 +0000 | [diff] [blame] | 2439 | return( SSL_CERTIFICATE_REQUEST_SEND_REQUEST ); |
| 2440 | } |
| 2441 | |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2442 | /* |
| 2443 | * struct { |
| 2444 | * opaque certificate_request_context<0..2^8-1>; |
| 2445 | * Extension extensions<2..2^16-1>; |
| 2446 | * } CertificateRequest; |
| 2447 | * |
| 2448 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2449 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2450 | static int ssl_tls13_write_certificate_request_body( mbedtls_ssl_context *ssl, |
| 2451 | unsigned char *buf, |
| 2452 | const unsigned char *end, |
| 2453 | size_t *out_len ) |
| 2454 | { |
| 2455 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2456 | unsigned char *p = buf; |
XiaokangQian | ec6efb9 | 2022-05-06 09:53:10 +0000 | [diff] [blame] | 2457 | size_t output_len = 0; |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2458 | unsigned char *p_extensions_len; |
| 2459 | |
| 2460 | *out_len = 0; |
| 2461 | |
| 2462 | /* Check if we have enough space: |
| 2463 | * - certificate_request_context (1 byte) |
| 2464 | * - extensions length (2 bytes) |
| 2465 | */ |
| 2466 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 3 ); |
| 2467 | |
| 2468 | /* |
| 2469 | * Write certificate_request_context |
| 2470 | */ |
| 2471 | /* |
| 2472 | * We use a zero length context for the normal handshake |
| 2473 | * messages. For post-authentication handshake messages |
| 2474 | * this request context would be set to a non-zero value. |
| 2475 | */ |
| 2476 | *p++ = 0x0; |
| 2477 | |
| 2478 | /* |
| 2479 | * Write extensions |
| 2480 | */ |
| 2481 | /* The extensions must contain the signature_algorithms. */ |
| 2482 | p_extensions_len = p; |
| 2483 | p += 2; |
XiaokangQian | ec6efb9 | 2022-05-06 09:53:10 +0000 | [diff] [blame] | 2484 | ret = mbedtls_ssl_write_sig_alg_ext( ssl, p, end, &output_len ); |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2485 | if( ret != 0 ) |
| 2486 | return( ret ); |
| 2487 | |
XiaokangQian | ec6efb9 | 2022-05-06 09:53:10 +0000 | [diff] [blame] | 2488 | p += output_len; |
XiaokangQian | aad9b0a | 2022-05-09 01:11:21 +0000 | [diff] [blame] | 2489 | MBEDTLS_PUT_UINT16_BE( p - p_extensions_len - 2, p_extensions_len, 0 ); |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2490 | |
| 2491 | *out_len = p - buf; |
| 2492 | |
| 2493 | return( 0 ); |
| 2494 | } |
| 2495 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2496 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2497 | static int ssl_tls13_write_certificate_request( mbedtls_ssl_context *ssl ) |
| 2498 | { |
| 2499 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2500 | |
| 2501 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) ); |
| 2502 | |
| 2503 | MBEDTLS_SSL_PROC_CHK_NEG( ssl_tls13_certificate_request_coordinate( ssl ) ); |
| 2504 | |
| 2505 | if( ret == SSL_CERTIFICATE_REQUEST_SEND_REQUEST ) |
| 2506 | { |
| 2507 | unsigned char *buf; |
| 2508 | size_t buf_len, msg_len; |
| 2509 | |
| 2510 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_start_handshake_msg( ssl, |
| 2511 | MBEDTLS_SSL_HS_CERTIFICATE_REQUEST, &buf, &buf_len ) ); |
| 2512 | |
| 2513 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_certificate_request_body( |
| 2514 | ssl, buf, buf + buf_len, &msg_len ) ); |
| 2515 | |
| 2516 | mbedtls_ssl_add_hs_msg_to_checksum( |
| 2517 | ssl, MBEDTLS_SSL_HS_CERTIFICATE_REQUEST, buf, msg_len ); |
| 2518 | |
| 2519 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_finish_handshake_msg( |
| 2520 | ssl, buf_len, msg_len ) ); |
| 2521 | } |
| 2522 | else if( ret == SSL_CERTIFICATE_REQUEST_SKIP ) |
| 2523 | { |
| 2524 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) ); |
| 2525 | ret = 0; |
| 2526 | } |
| 2527 | else |
| 2528 | { |
| 2529 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| 2530 | ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; |
| 2531 | goto cleanup; |
| 2532 | } |
| 2533 | |
| 2534 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_SERVER_CERTIFICATE ); |
| 2535 | cleanup: |
| 2536 | |
| 2537 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) ); |
| 2538 | return( ret ); |
| 2539 | } |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2540 | |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2541 | /* |
Jerry Yu | c6e6dbf | 2022-04-16 19:42:57 +0800 | [diff] [blame] | 2542 | * Handler for MBEDTLS_SSL_SERVER_CERTIFICATE |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2543 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2544 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | c6e6dbf | 2022-04-16 19:42:57 +0800 | [diff] [blame] | 2545 | static int ssl_tls13_write_server_certificate( mbedtls_ssl_context *ssl ) |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2546 | { |
Jerry Yu | 5a26f30 | 2022-05-10 20:46:40 +0800 | [diff] [blame] | 2547 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 2548 | |
| 2549 | #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| 2550 | if( ( ssl_tls13_pick_key_cert( ssl ) != 0 ) || |
| 2551 | mbedtls_ssl_own_cert( ssl ) == NULL ) |
Jerry Yu | 5a26f30 | 2022-05-10 20:46:40 +0800 | [diff] [blame] | 2552 | { |
Jerry Yu | b89125b | 2022-05-13 15:45:49 +0800 | [diff] [blame] | 2553 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "No certificate available." ) ); |
Jerry Yu | 5a26f30 | 2022-05-10 20:46:40 +0800 | [diff] [blame] | 2554 | MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE, |
| 2555 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE); |
Jerry Yu | f1c3c4e | 2022-05-10 11:36:35 +0800 | [diff] [blame] | 2556 | return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
Jerry Yu | 5a26f30 | 2022-05-10 20:46:40 +0800 | [diff] [blame] | 2557 | } |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 2558 | #endif /* MBEDTLS_X509_CRT_PARSE_C */ |
Jerry Yu | 5a26f30 | 2022-05-10 20:46:40 +0800 | [diff] [blame] | 2559 | |
Jerry Yu | f1c3c4e | 2022-05-10 11:36:35 +0800 | [diff] [blame] | 2560 | ret = mbedtls_ssl_tls13_write_certificate( ssl ); |
| 2561 | if( ret != 0 ) |
Jerry Yu | 1bff711 | 2022-04-16 14:29:11 +0800 | [diff] [blame] | 2562 | return( ret ); |
Jerry Yu | 1bff711 | 2022-04-16 14:29:11 +0800 | [diff] [blame] | 2563 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CERTIFICATE_VERIFY ); |
| 2564 | return( 0 ); |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2565 | } |
| 2566 | |
| 2567 | /* |
Jerry Yu | c6e6dbf | 2022-04-16 19:42:57 +0800 | [diff] [blame] | 2568 | * Handler for MBEDTLS_SSL_CERTIFICATE_VERIFY |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2569 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2570 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | c6e6dbf | 2022-04-16 19:42:57 +0800 | [diff] [blame] | 2571 | static int ssl_tls13_write_certificate_verify( mbedtls_ssl_context *ssl ) |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2572 | { |
Jerry Yu | 4ff9e14 | 2022-04-16 14:57:49 +0800 | [diff] [blame] | 2573 | int ret = mbedtls_ssl_tls13_write_certificate_verify( ssl ); |
Jerry Yu | f1c3c4e | 2022-05-10 11:36:35 +0800 | [diff] [blame] | 2574 | if( ret != 0 ) |
Jerry Yu | 4ff9e14 | 2022-04-16 14:57:49 +0800 | [diff] [blame] | 2575 | return( ret ); |
Jerry Yu | 4ff9e14 | 2022-04-16 14:57:49 +0800 | [diff] [blame] | 2576 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_SERVER_FINISHED ); |
| 2577 | return( 0 ); |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2578 | } |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 2579 | #endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED */ |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2580 | |
| 2581 | /* |
Jerry Yu | d6e253d | 2022-05-18 13:59:24 +0800 | [diff] [blame] | 2582 | * Handler for MBEDTLS_SSL_SERVER_FINISHED |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2583 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2584 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 4d8567f | 2022-04-17 10:57:57 +0800 | [diff] [blame] | 2585 | static int ssl_tls13_write_server_finished( mbedtls_ssl_context *ssl ) |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2586 | { |
Jerry Yu | d6e253d | 2022-05-18 13:59:24 +0800 | [diff] [blame] | 2587 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 27bdc7c | 2022-04-16 13:33:27 +0800 | [diff] [blame] | 2588 | |
| 2589 | ret = mbedtls_ssl_tls13_write_finished_message( ssl ); |
| 2590 | if( ret != 0 ) |
| 2591 | return( ret ); |
| 2592 | |
Jerry Yu | e3d67cb | 2022-05-19 15:33:10 +0800 | [diff] [blame] | 2593 | ret = mbedtls_ssl_tls13_compute_application_transform( ssl ); |
| 2594 | if( ret != 0 ) |
| 2595 | { |
| 2596 | MBEDTLS_SSL_PEND_FATAL_ALERT( |
| 2597 | MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE, |
| 2598 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); |
| 2599 | return( ret ); |
| 2600 | } |
XiaokangQian | c3017f6 | 2022-05-13 05:55:41 +0000 | [diff] [blame] | 2601 | |
Ronald Cron | 63dc463 | 2022-05-31 14:41:53 +0200 | [diff] [blame] | 2602 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "Switch to handshake keys for inbound traffic" ) ); |
| 2603 | mbedtls_ssl_set_inbound_transform( ssl, ssl->handshake->transform_handshake ); |
XiaokangQian | 189ded2 | 2022-05-10 08:12:17 +0000 | [diff] [blame] | 2604 | |
Ronald Cron | 63dc463 | 2022-05-31 14:41:53 +0200 | [diff] [blame] | 2605 | if( ssl->handshake->certificate_request_sent ) |
| 2606 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CLIENT_CERTIFICATE ); |
XiaokangQian | 189ded2 | 2022-05-10 08:12:17 +0000 | [diff] [blame] | 2607 | else |
Ronald Cron | 1938588 | 2022-06-15 16:26:13 +0200 | [diff] [blame] | 2608 | { |
| 2609 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "skip parse certificate" ) ); |
| 2610 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "skip parse certificate verify" ) ); |
XiaokangQian | 189ded2 | 2022-05-10 08:12:17 +0000 | [diff] [blame] | 2611 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CLIENT_FINISHED ); |
Ronald Cron | 1938588 | 2022-06-15 16:26:13 +0200 | [diff] [blame] | 2612 | } |
Ronald Cron | 63dc463 | 2022-05-31 14:41:53 +0200 | [diff] [blame] | 2613 | |
Jerry Yu | 27bdc7c | 2022-04-16 13:33:27 +0800 | [diff] [blame] | 2614 | return( 0 ); |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2615 | } |
| 2616 | |
| 2617 | /* |
Jerry Yu | d6e253d | 2022-05-18 13:59:24 +0800 | [diff] [blame] | 2618 | * Handler for MBEDTLS_SSL_CLIENT_FINISHED |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2619 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2620 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 4d8567f | 2022-04-17 10:57:57 +0800 | [diff] [blame] | 2621 | static int ssl_tls13_process_client_finished( mbedtls_ssl_context *ssl ) |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2622 | { |
Jerry Yu | d6e253d | 2022-05-18 13:59:24 +0800 | [diff] [blame] | 2623 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2624 | |
Jerry Yu | ff22698 | 2022-04-16 16:52:57 +0800 | [diff] [blame] | 2625 | ret = mbedtls_ssl_tls13_process_finished_message( ssl ); |
| 2626 | if( ret != 0 ) |
| 2627 | return( ret ); |
| 2628 | |
Jerry Yu | 466dda8 | 2022-09-13 11:20:20 +0800 | [diff] [blame] | 2629 | ret = mbedtls_ssl_tls13_compute_resumption_master_secret( ssl ); |
Jerry Yu | e3d67cb | 2022-05-19 15:33:10 +0800 | [diff] [blame] | 2630 | if( ret != 0 ) |
| 2631 | { |
| 2632 | MBEDTLS_SSL_DEBUG_RET( 1, |
Jerry Yu | 466dda8 | 2022-09-13 11:20:20 +0800 | [diff] [blame] | 2633 | "mbedtls_ssl_tls13_compute_resumption_master_secret", ret ); |
Jerry Yu | e3d67cb | 2022-05-19 15:33:10 +0800 | [diff] [blame] | 2634 | } |
| 2635 | |
Jerry Yu | 03ed50b | 2022-04-16 17:13:30 +0800 | [diff] [blame] | 2636 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_HANDSHAKE_WRAPUP ); |
Jerry Yu | ff22698 | 2022-04-16 16:52:57 +0800 | [diff] [blame] | 2637 | return( 0 ); |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2638 | } |
| 2639 | |
| 2640 | /* |
Jerry Yu | d6e253d | 2022-05-18 13:59:24 +0800 | [diff] [blame] | 2641 | * Handler for MBEDTLS_SSL_HANDSHAKE_WRAPUP |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2642 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2643 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 4d8567f | 2022-04-17 10:57:57 +0800 | [diff] [blame] | 2644 | static int ssl_tls13_handshake_wrapup( mbedtls_ssl_context *ssl ) |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2645 | { |
Jerry Yu | 03ed50b | 2022-04-16 17:13:30 +0800 | [diff] [blame] | 2646 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) ); |
| 2647 | |
Jerry Yu | 03ed50b | 2022-04-16 17:13:30 +0800 | [diff] [blame] | 2648 | mbedtls_ssl_tls13_handshake_wrapup( ssl ); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2649 | |
| 2650 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2651 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_NEW_SESSION_TICKET ); |
| 2652 | #else |
Jerry Yu | 03ed50b | 2022-04-16 17:13:30 +0800 | [diff] [blame] | 2653 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_HANDSHAKE_OVER ); |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2654 | #endif |
Jerry Yu | 03ed50b | 2022-04-16 17:13:30 +0800 | [diff] [blame] | 2655 | return( 0 ); |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2656 | } |
| 2657 | |
| 2658 | /* |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2659 | * Handler for MBEDTLS_SSL_NEW_SESSION_TICKET |
| 2660 | */ |
| 2661 | #define SSL_NEW_SESSION_TICKET_SKIP 0 |
| 2662 | #define SSL_NEW_SESSION_TICKET_WRITE 1 |
| 2663 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 2664 | static int ssl_tls13_write_new_session_ticket_coordinate( mbedtls_ssl_context *ssl ) |
| 2665 | { |
| 2666 | /* Check whether the use of session tickets is enabled */ |
| 2667 | if( ssl->conf->f_ticket_write == NULL ) |
| 2668 | { |
Jerry Yu | d0766ec | 2022-09-22 10:46:57 +0800 | [diff] [blame] | 2669 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "NewSessionTicket: disabled," |
| 2670 | " callback is not set" ) ); |
| 2671 | return( SSL_NEW_SESSION_TICKET_SKIP ); |
| 2672 | } |
| 2673 | if( ssl->conf->new_session_tickets_count == 0 ) |
| 2674 | { |
| 2675 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "NewSessionTicket: disabled," |
| 2676 | " configured count is zero" ) ); |
| 2677 | return( SSL_NEW_SESSION_TICKET_SKIP ); |
| 2678 | } |
| 2679 | |
| 2680 | if( ssl->handshake->new_session_tickets_count == 0 ) |
| 2681 | { |
| 2682 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "NewSessionTicket: all tickets have " |
| 2683 | "been sent." ) ); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2684 | return( SSL_NEW_SESSION_TICKET_SKIP ); |
| 2685 | } |
| 2686 | |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2687 | return( SSL_NEW_SESSION_TICKET_WRITE ); |
| 2688 | } |
| 2689 | |
| 2690 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
| 2691 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 2692 | static int ssl_tls13_prepare_new_session_ticket( mbedtls_ssl_context *ssl, |
| 2693 | unsigned char *ticket_nonce, |
| 2694 | size_t ticket_nonce_size ) |
| 2695 | { |
| 2696 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2697 | mbedtls_ssl_session *session = ssl->session; |
| 2698 | mbedtls_ssl_ciphersuite_t *ciphersuite_info; |
| 2699 | psa_algorithm_t psa_hash_alg; |
| 2700 | int hash_length; |
| 2701 | |
| 2702 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> prepare NewSessionTicket msg" ) ); |
| 2703 | |
| 2704 | #if defined(MBEDTLS_HAVE_TIME) |
| 2705 | session->start = mbedtls_time( NULL ); |
| 2706 | #endif |
| 2707 | |
| 2708 | /* Generate ticket_age_add */ |
| 2709 | if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2710 | (unsigned char *) &session->ticket_age_add, |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2711 | sizeof( session->ticket_age_add ) ) != 0 ) ) |
| 2712 | { |
| 2713 | MBEDTLS_SSL_DEBUG_RET( 1, "generate_ticket_age_add", ret ); |
| 2714 | return( ret ); |
| 2715 | } |
| 2716 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket_age_add: %u", |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2717 | (unsigned int)session->ticket_age_add ) ); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2718 | |
| 2719 | /* Generate ticket_nonce */ |
| 2720 | ret = ssl->conf->f_rng( ssl->conf->p_rng, ticket_nonce, ticket_nonce_size ); |
| 2721 | if( ret != 0 ) |
| 2722 | { |
| 2723 | MBEDTLS_SSL_DEBUG_RET( 1, "generate_ticket_nonce", ret ); |
| 2724 | return( ret ); |
| 2725 | } |
| 2726 | MBEDTLS_SSL_DEBUG_BUF( 3, "ticket_nonce:", |
| 2727 | ticket_nonce, ticket_nonce_size ); |
| 2728 | |
| 2729 | ciphersuite_info = |
| 2730 | (mbedtls_ssl_ciphersuite_t *) ssl->handshake->ciphersuite_info; |
| 2731 | psa_hash_alg = mbedtls_psa_translate_md( ciphersuite_info->mac ); |
| 2732 | hash_length = PSA_HASH_LENGTH( psa_hash_alg ); |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2733 | if( hash_length == -1 || |
Jerry Yu | 6119715 | 2022-07-21 16:28:02 +0800 | [diff] [blame] | 2734 | (size_t)hash_length > sizeof( session->resumption_key ) ) |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2735 | { |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2736 | return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2737 | } |
| 2738 | |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2739 | /* In this code the psk key length equals the length of the hash */ |
| 2740 | session->resumption_key_len = hash_length; |
| 2741 | session->ciphersuite = ciphersuite_info->id; |
| 2742 | |
| 2743 | /* Compute resumption key |
| 2744 | * |
| 2745 | * HKDF-Expand-Label( resumption_master_secret, |
| 2746 | * "resumption", ticket_nonce, Hash.length ) |
| 2747 | */ |
| 2748 | ret = mbedtls_ssl_tls13_hkdf_expand_label( |
| 2749 | psa_hash_alg, |
| 2750 | session->app_secrets.resumption_master_secret, |
| 2751 | hash_length, |
| 2752 | MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( resumption ), |
| 2753 | ticket_nonce, |
| 2754 | ticket_nonce_size, |
| 2755 | session->resumption_key, |
| 2756 | hash_length ); |
| 2757 | |
| 2758 | if( ret != 0 ) |
| 2759 | { |
| 2760 | MBEDTLS_SSL_DEBUG_RET( 2, |
| 2761 | "Creating the ticket-resumed PSK failed", |
| 2762 | ret ); |
| 2763 | return ( ret ); |
| 2764 | } |
| 2765 | MBEDTLS_SSL_DEBUG_BUF( 3, "Ticket-resumed PSK", |
| 2766 | session->resumption_key, |
| 2767 | session->resumption_key_len ); |
| 2768 | |
| 2769 | MBEDTLS_SSL_DEBUG_BUF( 3, "resumption_master_secret", |
| 2770 | session->app_secrets.resumption_master_secret, |
| 2771 | hash_length ); |
| 2772 | |
| 2773 | return( 0 ); |
| 2774 | } |
| 2775 | |
| 2776 | /* This function creates a NewSessionTicket message in the following format: |
| 2777 | * |
| 2778 | * struct { |
| 2779 | * uint32 ticket_lifetime; |
| 2780 | * uint32 ticket_age_add; |
| 2781 | * opaque ticket_nonce<0..255>; |
| 2782 | * opaque ticket<1..2^16-1>; |
| 2783 | * Extension extensions<0..2^16-2>; |
| 2784 | * } NewSessionTicket; |
| 2785 | * |
| 2786 | * The ticket inside the NewSessionTicket message is an encrypted container |
| 2787 | * carrying the necessary information so that the server is later able to |
| 2788 | * re-start the communication. |
| 2789 | * |
| 2790 | * The following fields are placed inside the ticket by the |
| 2791 | * f_ticket_write() function: |
| 2792 | * |
| 2793 | * - creation time (start) |
| 2794 | * - flags (flags) |
| 2795 | * - age add (ticket_age_add) |
| 2796 | * - key (key) |
| 2797 | * - key length (key_len) |
| 2798 | * - ciphersuite (ciphersuite) |
| 2799 | */ |
| 2800 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 2801 | static int ssl_tls13_write_new_session_ticket_body( mbedtls_ssl_context *ssl, |
| 2802 | unsigned char *buf, |
| 2803 | unsigned char *end, |
| 2804 | size_t *out_len, |
| 2805 | unsigned char *ticket_nonce, |
| 2806 | size_t ticket_nonce_size ) |
| 2807 | { |
| 2808 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2809 | unsigned char *p = buf; |
| 2810 | mbedtls_ssl_session *session = ssl->session; |
| 2811 | size_t ticket_len; |
| 2812 | uint32_t ticket_lifetime; |
| 2813 | |
| 2814 | *out_len = 0; |
| 2815 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write NewSessionTicket msg" ) ); |
| 2816 | |
| 2817 | /* |
| 2818 | * ticket_lifetime 4 bytes |
| 2819 | * ticket_age_add 4 bytes |
| 2820 | * ticket_nonce 1 + ticket_nonce_size bytes |
| 2821 | * ticket >=2 bytes |
| 2822 | */ |
| 2823 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 + 4 + 1 + ticket_nonce_size + 2 ); |
| 2824 | |
| 2825 | /* Generate ticket and ticket_lifetime */ |
| 2826 | ret = ssl->conf->f_ticket_write( ssl->conf->p_ticket, |
| 2827 | session, |
| 2828 | p + 9 + ticket_nonce_size + 2, |
| 2829 | end, |
| 2830 | &ticket_len, |
| 2831 | &ticket_lifetime); |
| 2832 | if( ret != 0 ) |
| 2833 | { |
| 2834 | MBEDTLS_SSL_DEBUG_RET( 1, "write_ticket", ret ); |
| 2835 | return( ret ); |
| 2836 | } |
| 2837 | /* RFC 8446 4.6.1 |
| 2838 | * ticket_lifetime: Indicates the lifetime in seconds as a 32-bit |
| 2839 | * unsigned integer in network byte order from the time of ticket |
| 2840 | * issuance. Servers MUST NOT use any value greater than |
| 2841 | * 604800 seconds (7 days). The value of zero indicates that the |
| 2842 | * ticket should be discarded immediately. Clients MUST NOT cache |
| 2843 | * tickets for longer than 7 days, regardless of the ticket_lifetime, |
| 2844 | * and MAY delete tickets earlier based on local policy. A server |
| 2845 | * MAY treat a ticket as valid for a shorter period of time than what |
| 2846 | * is stated in the ticket_lifetime. |
| 2847 | */ |
Xiaokang Qian | 28af501 | 2022-10-13 08:18:19 +0000 | [diff] [blame] | 2848 | if( ticket_lifetime > 604800 ) |
| 2849 | ticket_lifetime = 604800; |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2850 | MBEDTLS_PUT_UINT32_BE( ticket_lifetime, p, 0 ); |
| 2851 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket_lifetime: %u", |
| 2852 | ( unsigned int )ticket_lifetime ) ); |
| 2853 | |
| 2854 | /* Write ticket_age_add */ |
| 2855 | MBEDTLS_PUT_UINT32_BE( session->ticket_age_add, p, 4 ); |
| 2856 | MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket_age_add: %u", |
| 2857 | ( unsigned int )session->ticket_age_add ) ); |
| 2858 | |
| 2859 | /* Write ticket_nonce */ |
| 2860 | p[8] = ( unsigned char )ticket_nonce_size; |
| 2861 | if( ticket_nonce_size > 0 ) |
| 2862 | { |
| 2863 | memcpy( p + 9, ticket_nonce, ticket_nonce_size ); |
| 2864 | } |
| 2865 | p += 9 + ticket_nonce_size; |
| 2866 | |
| 2867 | /* Write ticket */ |
| 2868 | MBEDTLS_PUT_UINT16_BE( ticket_len, p, 0 ); |
| 2869 | p += 2; |
| 2870 | MBEDTLS_SSL_DEBUG_BUF( 4, "ticket", p, ticket_len); |
| 2871 | p += ticket_len; |
| 2872 | |
| 2873 | /* Ticket Extensions |
| 2874 | * |
| 2875 | * Note: We currently don't have any extensions. |
| 2876 | * Set length to zero. |
| 2877 | */ |
| 2878 | MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 ); |
| 2879 | MBEDTLS_PUT_UINT16_BE( 0, p, 0 ); |
| 2880 | p += 2; |
| 2881 | |
| 2882 | *out_len = p - buf; |
| 2883 | MBEDTLS_SSL_DEBUG_BUF( 4, "ticket", buf, *out_len ); |
| 2884 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write new session ticket" ) ); |
| 2885 | |
| 2886 | return( 0 ); |
| 2887 | } |
| 2888 | |
| 2889 | /* |
| 2890 | * Handler for MBEDTLS_SSL_NEW_SESSION_TICKET |
| 2891 | */ |
| 2892 | static int ssl_tls13_write_new_session_ticket( mbedtls_ssl_context *ssl ) |
| 2893 | { |
| 2894 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2895 | |
| 2896 | MBEDTLS_SSL_PROC_CHK_NEG( ssl_tls13_write_new_session_ticket_coordinate( ssl ) ); |
| 2897 | |
| 2898 | if( ret == SSL_NEW_SESSION_TICKET_WRITE ) |
| 2899 | { |
| 2900 | unsigned char ticket_nonce[MBEDTLS_SSL_TLS1_3_TICKET_NONCE_LENGTH]; |
| 2901 | unsigned char *buf; |
| 2902 | size_t buf_len, msg_len; |
| 2903 | |
| 2904 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_prepare_new_session_ticket( |
| 2905 | ssl, ticket_nonce, sizeof( ticket_nonce ) ) ); |
| 2906 | |
| 2907 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_start_handshake_msg( ssl, |
| 2908 | MBEDTLS_SSL_HS_NEW_SESSION_TICKET, &buf, &buf_len ) ); |
| 2909 | |
| 2910 | MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_new_session_ticket_body( |
| 2911 | ssl, buf, buf + buf_len, &msg_len, |
| 2912 | ticket_nonce, sizeof( ticket_nonce ) ) ); |
| 2913 | |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2914 | MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_finish_handshake_msg( |
| 2915 | ssl, buf_len, msg_len ) ); |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2916 | |
Jerry Yu | 359e65f | 2022-09-22 23:47:43 +0800 | [diff] [blame] | 2917 | /* Limit session tickets count to one when resumption connection. |
| 2918 | * |
| 2919 | * See document of mbedtls_ssl_conf_new_session_tickets. |
| 2920 | */ |
| 2921 | if( ssl->handshake->resume == 1 ) |
| 2922 | ssl->handshake->new_session_tickets_count = 0; |
| 2923 | else |
| 2924 | ssl->handshake->new_session_tickets_count--; |
Jerry Yu | b7e3fa7 | 2022-09-22 11:07:18 +0800 | [diff] [blame] | 2925 | |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2926 | mbedtls_ssl_handshake_set_state( ssl, |
| 2927 | MBEDTLS_SSL_NEW_SESSION_TICKET_FLUSH ); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2928 | } |
| 2929 | else |
| 2930 | { |
| 2931 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_HANDSHAKE_OVER ); |
| 2932 | } |
| 2933 | |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2934 | cleanup: |
| 2935 | |
| 2936 | return( ret ); |
| 2937 | } |
| 2938 | #endif /* MBEDTLS_SSL_SESSION_TICKETS */ |
| 2939 | |
| 2940 | /* |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 2941 | * TLS 1.3 State Machine -- server side |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2942 | */ |
Jerry Yu | 2756193 | 2021-08-27 17:07:38 +0800 | [diff] [blame] | 2943 | int mbedtls_ssl_tls13_handshake_server_step( mbedtls_ssl_context *ssl ) |
Jerry Yu | b9930e7 | 2021-08-06 17:11:51 +0800 | [diff] [blame] | 2944 | { |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 2945 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2946 | |
| 2947 | if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER || ssl->handshake == NULL ) |
| 2948 | return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| 2949 | |
Jerry Yu | e3b3412 | 2021-09-28 17:53:35 +0800 | [diff] [blame] | 2950 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "tls13 server state: %s(%d)", |
| 2951 | mbedtls_ssl_states_str( ssl->state ), |
| 2952 | ssl->state ) ); |
Jerry Yu | 6e81b27 | 2021-09-27 11:16:17 +0800 | [diff] [blame] | 2953 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2954 | switch( ssl->state ) |
| 2955 | { |
| 2956 | /* start state */ |
| 2957 | case MBEDTLS_SSL_HELLO_REQUEST: |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2958 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CLIENT_HELLO ); |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 2959 | ret = 0; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2960 | break; |
| 2961 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2962 | case MBEDTLS_SSL_CLIENT_HELLO: |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 2963 | ret = ssl_tls13_process_client_hello( ssl ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2964 | if( ret != 0 ) |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 2965 | MBEDTLS_SSL_DEBUG_RET( 1, "ssl_tls13_process_client_hello", ret ); |
Jerry Yu | f41553b | 2022-05-09 22:20:30 +0800 | [diff] [blame] | 2966 | break; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2967 | |
Jerry Yu | f41553b | 2022-05-09 22:20:30 +0800 | [diff] [blame] | 2968 | case MBEDTLS_SSL_HELLO_RETRY_REQUEST: |
| 2969 | ret = ssl_tls13_write_hello_retry_request( ssl ); |
| 2970 | if( ret != 0 ) |
| 2971 | { |
| 2972 | MBEDTLS_SSL_DEBUG_RET( 1, "ssl_tls13_write_hello_retry_request", ret ); |
| 2973 | return( ret ); |
| 2974 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2975 | break; |
| 2976 | |
Jerry Yu | 5b64ae9 | 2022-03-30 17:15:02 +0800 | [diff] [blame] | 2977 | case MBEDTLS_SSL_SERVER_HELLO: |
| 2978 | ret = ssl_tls13_write_server_hello( ssl ); |
| 2979 | break; |
| 2980 | |
Xiaofei Bai | cba64af | 2022-02-15 10:00:56 +0000 | [diff] [blame] | 2981 | case MBEDTLS_SSL_ENCRYPTED_EXTENSIONS: |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2982 | ret = ssl_tls13_write_encrypted_extensions( ssl ); |
Xiaofei Bai | cba64af | 2022-02-15 10:00:56 +0000 | [diff] [blame] | 2983 | if( ret != 0 ) |
| 2984 | { |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2985 | MBEDTLS_SSL_DEBUG_RET( 1, "ssl_tls13_write_encrypted_extensions", ret ); |
| 2986 | return( ret ); |
Xiaofei Bai | cba64af | 2022-02-15 10:00:56 +0000 | [diff] [blame] | 2987 | } |
Jerry Yu | 4833056 | 2022-05-06 21:35:44 +0800 | [diff] [blame] | 2988 | break; |
Jerry Yu | 6a2cd9e | 2022-05-05 11:14:19 +0800 | [diff] [blame] | 2989 | |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 2990 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED) |
Xiaofei Bai | 9ca09d4 | 2022-02-14 12:57:18 +0000 | [diff] [blame] | 2991 | case MBEDTLS_SSL_CERTIFICATE_REQUEST: |
Xiaofei Bai | 5ee73d8 | 2022-03-14 02:48:30 +0000 | [diff] [blame] | 2992 | ret = ssl_tls13_write_certificate_request( ssl ); |
Xiaofei Bai | 9ca09d4 | 2022-02-14 12:57:18 +0000 | [diff] [blame] | 2993 | break; |
Xiaofei Bai | 9ca09d4 | 2022-02-14 12:57:18 +0000 | [diff] [blame] | 2994 | |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2995 | case MBEDTLS_SSL_SERVER_CERTIFICATE: |
| 2996 | ret = ssl_tls13_write_server_certificate( ssl ); |
| 2997 | break; |
| 2998 | |
| 2999 | case MBEDTLS_SSL_CERTIFICATE_VERIFY: |
| 3000 | ret = ssl_tls13_write_certificate_verify( ssl ); |
| 3001 | break; |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 3002 | #endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED */ |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 3003 | |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 3004 | /* |
| 3005 | * Injection of dummy-CCS's for middlebox compatibility |
| 3006 | */ |
| 3007 | #if defined(MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE) |
Gabor Mezei | f7044ea | 2022-06-28 16:01:49 +0200 | [diff] [blame] | 3008 | case MBEDTLS_SSL_SERVER_CCS_AFTER_HELLO_RETRY_REQUEST: |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 3009 | ret = mbedtls_ssl_tls13_write_change_cipher_spec( ssl ); |
| 3010 | if( ret == 0 ) |
| 3011 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CLIENT_HELLO ); |
| 3012 | break; |
| 3013 | |
| 3014 | case MBEDTLS_SSL_SERVER_CCS_AFTER_SERVER_HELLO: |
| 3015 | ret = mbedtls_ssl_tls13_write_change_cipher_spec( ssl ); |
| 3016 | if( ret == 0 ) |
| 3017 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_ENCRYPTED_EXTENSIONS ); |
| 3018 | break; |
| 3019 | #endif /* MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE */ |
| 3020 | |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 3021 | case MBEDTLS_SSL_SERVER_FINISHED: |
| 3022 | ret = ssl_tls13_write_server_finished( ssl ); |
| 3023 | break; |
| 3024 | |
| 3025 | case MBEDTLS_SSL_CLIENT_FINISHED: |
| 3026 | ret = ssl_tls13_process_client_finished( ssl ); |
| 3027 | break; |
| 3028 | |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 3029 | case MBEDTLS_SSL_HANDSHAKE_WRAPUP: |
| 3030 | ret = ssl_tls13_handshake_wrapup( ssl ); |
| 3031 | break; |
| 3032 | |
Ronald Cron | 766c0cd | 2022-10-18 12:17:11 +0200 | [diff] [blame] | 3033 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED) |
XiaokangQian | 6b916b1 | 2022-04-25 07:29:34 +0000 | [diff] [blame] | 3034 | case MBEDTLS_SSL_CLIENT_CERTIFICATE: |
| 3035 | ret = mbedtls_ssl_tls13_process_certificate( ssl ); |
Ronald Cron | 209cae9 | 2022-06-07 10:30:19 +0200 | [diff] [blame] | 3036 | if( ret == 0 ) |
XiaokangQian | 6b916b1 | 2022-04-25 07:29:34 +0000 | [diff] [blame] | 3037 | { |
Ronald Cron | 209cae9 | 2022-06-07 10:30:19 +0200 | [diff] [blame] | 3038 | if( ssl->session_negotiate->peer_cert != NULL ) |
| 3039 | { |
| 3040 | mbedtls_ssl_handshake_set_state( |
| 3041 | ssl, MBEDTLS_SSL_CLIENT_CERTIFICATE_VERIFY ); |
| 3042 | } |
| 3043 | else |
Ronald Cron | 1938588 | 2022-06-15 16:26:13 +0200 | [diff] [blame] | 3044 | { |
| 3045 | MBEDTLS_SSL_DEBUG_MSG( 2, ( "skip parse certificate verify" ) ); |
Ronald Cron | 209cae9 | 2022-06-07 10:30:19 +0200 | [diff] [blame] | 3046 | mbedtls_ssl_handshake_set_state( |
| 3047 | ssl, MBEDTLS_SSL_CLIENT_FINISHED ); |
Ronald Cron | 1938588 | 2022-06-15 16:26:13 +0200 | [diff] [blame] | 3048 | } |
XiaokangQian | 6b916b1 | 2022-04-25 07:29:34 +0000 | [diff] [blame] | 3049 | } |
| 3050 | break; |
| 3051 | |
| 3052 | case MBEDTLS_SSL_CLIENT_CERTIFICATE_VERIFY: |
| 3053 | ret = mbedtls_ssl_tls13_process_certificate_verify( ssl ); |
| 3054 | if( ret == 0 ) |
| 3055 | { |
| 3056 | mbedtls_ssl_handshake_set_state( |
| 3057 | ssl, MBEDTLS_SSL_CLIENT_FINISHED ); |
| 3058 | } |
| 3059 | break; |
Ronald Cron | 766c0cd | 2022-10-18 12:17:11 +0200 | [diff] [blame] | 3060 | #endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED */ |
XiaokangQian | 6b916b1 | 2022-04-25 07:29:34 +0000 | [diff] [blame] | 3061 | |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 3062 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
| 3063 | case MBEDTLS_SSL_NEW_SESSION_TICKET: |
| 3064 | ret = ssl_tls13_write_new_session_ticket( ssl ); |
| 3065 | if( ret != 0 ) |
| 3066 | { |
| 3067 | MBEDTLS_SSL_DEBUG_RET( 1, |
| 3068 | "ssl_tls13_write_new_session_ticket ", |
| 3069 | ret ); |
| 3070 | } |
| 3071 | break; |
| 3072 | case MBEDTLS_SSL_NEW_SESSION_TICKET_FLUSH: |
| 3073 | /* This state is necessary to do the flush of the New Session |
| 3074 | * Ticket message written in MBEDTLS_SSL_NEW_SESSION_TICKET |
| 3075 | * as part of ssl_prepare_handshake_step. |
| 3076 | */ |
| 3077 | ret = 0; |
Jerry Yu | d4e7500 | 2022-08-09 13:33:50 +0800 | [diff] [blame] | 3078 | |
Jerry Yu | d0766ec | 2022-09-22 10:46:57 +0800 | [diff] [blame] | 3079 | if( ssl->handshake->new_session_tickets_count == 0 ) |
Jerry Yu | d4e7500 | 2022-08-09 13:33:50 +0800 | [diff] [blame] | 3080 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_HANDSHAKE_OVER ); |
| 3081 | else |
| 3082 | mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_NEW_SESSION_TICKET ); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 3083 | break; |
| 3084 | |
| 3085 | #endif /* MBEDTLS_SSL_SESSION_TICKETS */ |
| 3086 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 3087 | default: |
| 3088 | MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) ); |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 3089 | return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 3090 | } |
| 3091 | |
| 3092 | return( ret ); |
Jerry Yu | b9930e7 | 2021-08-06 17:11:51 +0800 | [diff] [blame] | 3093 | } |
Jerry Yu | 3cc4c2a | 2021-08-06 16:29:08 +0800 | [diff] [blame] | 3094 | |
Jerry Yu | fb4b647 | 2022-01-27 15:03:26 +0800 | [diff] [blame] | 3095 | #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_PROTO_TLS1_3 */ |