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. |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 18 | */ |
Jerry Yu | 3cc4c2a | 2021-08-06 16:29:08 +0800 | [diff] [blame] | 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 | |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 33 | |
Jerry Yu | c5a23a0 | 2022-08-25 10:51:44 +0800 | [diff] [blame] | 34 | static const mbedtls_ssl_ciphersuite_t *ssl_tls13_validate_peer_ciphersuite( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 35 | mbedtls_ssl_context *ssl, |
| 36 | unsigned int cipher_suite) |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 37 | { |
| 38 | const mbedtls_ssl_ciphersuite_t *ciphersuite_info; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 39 | if (!mbedtls_ssl_tls13_cipher_suite_is_offered(ssl, cipher_suite)) { |
| 40 | return NULL; |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 41 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 42 | |
| 43 | ciphersuite_info = mbedtls_ssl_ciphersuite_from_id(cipher_suite); |
| 44 | if ((mbedtls_ssl_validate_ciphersuite(ssl, ciphersuite_info, |
| 45 | ssl->tls_version, |
| 46 | ssl->tls_version) != 0)) { |
| 47 | return NULL; |
| 48 | } |
| 49 | return ciphersuite_info; |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 50 | } |
| 51 | |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 52 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 53 | /* From RFC 8446: |
| 54 | * |
| 55 | * enum { psk_ke(0), psk_dhe_ke(1), (255) } PskKeyExchangeMode; |
| 56 | * struct { |
| 57 | * PskKeyExchangeMode ke_modes<1..255>; |
| 58 | * } PskKeyExchangeModes; |
| 59 | */ |
Jerry Yu | 6e74a7e | 2022-07-20 20:49:32 +0800 | [diff] [blame] | 60 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 61 | static int ssl_tls13_parse_key_exchange_modes_ext(mbedtls_ssl_context *ssl, |
| 62 | const unsigned char *buf, |
| 63 | const unsigned char *end) |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 64 | { |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 65 | const unsigned char *p = buf; |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 66 | size_t ke_modes_len; |
| 67 | int ke_modes = 0; |
| 68 | |
Jerry Yu | 854dd9e | 2022-07-15 14:28:27 +0800 | [diff] [blame] | 69 | /* Read ke_modes length (1 Byte) */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 70 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, 1); |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 71 | ke_modes_len = *p++; |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 72 | /* Currently, there are only two PSK modes, so even without looking |
| 73 | * at the content, something's wrong if the list has more than 2 items. */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 74 | if (ke_modes_len > 2) { |
| 75 | MBEDTLS_SSL_PEND_FATAL_ALERT(MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER, |
| 76 | MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER); |
| 77 | return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE; |
Jerry Yu | 299e31f | 2022-07-13 23:06:36 +0800 | [diff] [blame] | 78 | } |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 79 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 80 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, ke_modes_len); |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 81 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 82 | while (ke_modes_len-- != 0) { |
| 83 | switch (*p++) { |
| 84 | case MBEDTLS_SSL_TLS1_3_PSK_MODE_PURE: |
| 85 | ke_modes |= MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK; |
| 86 | MBEDTLS_SSL_DEBUG_MSG(3, ("Found PSK KEX MODE")); |
| 87 | break; |
| 88 | case MBEDTLS_SSL_TLS1_3_PSK_MODE_ECDHE: |
| 89 | ke_modes |= MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL; |
| 90 | MBEDTLS_SSL_DEBUG_MSG(3, ("Found PSK_EPHEMERAL KEX MODE")); |
| 91 | break; |
| 92 | default: |
| 93 | MBEDTLS_SSL_PEND_FATAL_ALERT(MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER, |
| 94 | MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER); |
| 95 | return MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER; |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 96 | } |
| 97 | } |
| 98 | |
| 99 | ssl->handshake->tls13_kex_modes = ke_modes; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 100 | return 0; |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 101 | } |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 102 | |
Jerry Yu | e9d4fc0 | 2022-08-20 19:21:15 +0800 | [diff] [blame] | 103 | #define SSL_TLS1_3_OFFERED_PSK_NOT_MATCH 1 |
| 104 | #define SSL_TLS1_3_OFFERED_PSK_MATCH 0 |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 105 | |
| 106 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
| 107 | |
| 108 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 109 | static int ssl_tls13_offered_psks_check_identity_match_ticket( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 110 | mbedtls_ssl_context *ssl, |
| 111 | const unsigned char *identity, |
| 112 | size_t identity_len, |
| 113 | uint32_t obfuscated_ticket_age, |
| 114 | mbedtls_ssl_session *session) |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 115 | { |
Jerry Yu | fd310eb | 2022-09-06 09:16:35 +0800 | [diff] [blame] | 116 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 117 | unsigned char *ticket_buffer; |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 118 | #if defined(MBEDTLS_HAVE_TIME) |
| 119 | mbedtls_time_t now; |
Jerry Yu | acff823 | 2022-09-14 14:35:11 +0800 | [diff] [blame] | 120 | uint64_t age_in_s; |
Jerry Yu | f7dad3c | 2022-09-14 22:31:39 +0800 | [diff] [blame] | 121 | int64_t age_diff_in_ms; |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 122 | #endif |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 123 | |
| 124 | ((void) obfuscated_ticket_age); |
| 125 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 126 | MBEDTLS_SSL_DEBUG_MSG(2, ("=> check_identity_match_ticket")); |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 127 | |
Jerry Yu | fd310eb | 2022-09-06 09:16:35 +0800 | [diff] [blame] | 128 | /* Ticket parser is not configured, Skip */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 129 | if (ssl->conf->f_ticket_parse == NULL || identity_len == 0) { |
| 130 | return 0; |
| 131 | } |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 132 | |
Jerry Yu | 4746b10 | 2022-09-13 11:11:48 +0800 | [diff] [blame] | 133 | /* We create a copy of the encrypted ticket since the ticket parsing |
| 134 | * function is allowed to use its input buffer as an output buffer |
| 135 | * (in-place decryption). We do, however, need the original buffer for |
| 136 | * computing the PSK binder value. |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 137 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 138 | ticket_buffer = mbedtls_calloc(1, identity_len); |
| 139 | if (ticket_buffer == NULL) { |
| 140 | MBEDTLS_SSL_DEBUG_MSG(1, ("buffer too small")); |
| 141 | return MBEDTLS_ERR_SSL_ALLOC_FAILED; |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 142 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 143 | memcpy(ticket_buffer, identity, identity_len); |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 144 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 145 | if ((ret = ssl->conf->f_ticket_parse(ssl->conf->p_ticket, |
| 146 | session, |
| 147 | ticket_buffer, identity_len)) != 0) { |
| 148 | if (ret == MBEDTLS_ERR_SSL_INVALID_MAC) { |
| 149 | MBEDTLS_SSL_DEBUG_MSG(3, ("ticket is not authentic")); |
| 150 | } else if (ret == MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED) { |
| 151 | MBEDTLS_SSL_DEBUG_MSG(3, ("ticket is expired")); |
| 152 | } else { |
| 153 | MBEDTLS_SSL_DEBUG_RET(1, "ticket_parse", ret); |
| 154 | } |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 155 | } |
| 156 | |
| 157 | /* We delete the temporary buffer */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 158 | mbedtls_free(ticket_buffer); |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 159 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 160 | if (ret != 0) { |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 161 | goto exit; |
| 162 | } |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 163 | |
Pengyu Lv | 3eb49be | 2022-12-05 16:35:12 +0800 | [diff] [blame] | 164 | /* RFC 8446 section 4.2.9 |
| 165 | * |
| 166 | * Servers SHOULD NOT send NewSessionTicket with tickets that are not |
| 167 | * compatible with the advertised modes; however, if a server does so, |
| 168 | * the impact will just be that the client's attempts at resumption fail. |
| 169 | * |
| 170 | * We regard the ticket with incompatible key exchange modes as not match. |
| 171 | */ |
Pengyu Lv | 1894653 | 2023-01-12 12:28:09 +0800 | [diff] [blame] | 172 | ret = MBEDTLS_ERR_ERROR_GENERIC_ERROR; |
Pengyu Lv | 4938a56 | 2023-01-16 11:28:49 +0800 | [diff] [blame] | 173 | MBEDTLS_SSL_PRINT_TICKET_FLAGS(4, |
Pengyu Lv | 80270b2 | 2023-01-12 11:54:04 +0800 | [diff] [blame] | 174 | session->ticket_flags); |
Pengyu Lv | e2f1dbf | 2023-01-16 12:28:27 +0800 | [diff] [blame] | 175 | if (mbedtls_ssl_tls13_check_kex_modes( |
| 176 | ssl, |
| 177 | mbedtls_ssl_session_get_ticket_flags( |
| 178 | session, |
| 179 | MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_ALL))) { |
Pengyu Lv | 3eb49be | 2022-12-05 16:35:12 +0800 | [diff] [blame] | 180 | MBEDTLS_SSL_DEBUG_MSG(3, ("No suitable key exchange mode")); |
| 181 | goto exit; |
| 182 | } |
| 183 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 184 | ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED; |
| 185 | #if defined(MBEDTLS_HAVE_TIME) |
| 186 | now = mbedtls_time(NULL); |
| 187 | |
| 188 | if (now < session->start) { |
| 189 | MBEDTLS_SSL_DEBUG_MSG( |
| 190 | 3, ("Invalid ticket start time ( now=%" MBEDTLS_PRINTF_LONGLONG |
| 191 | ", start=%" MBEDTLS_PRINTF_LONGLONG " )", |
| 192 | (long long) now, (long long) session->start)); |
| 193 | goto exit; |
| 194 | } |
| 195 | |
| 196 | age_in_s = (uint64_t) (now - session->start); |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 197 | |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 198 | /* RFC 8446 section 4.6.1 |
| 199 | * |
| 200 | * Servers MUST NOT use any value greater than 604800 seconds (7 days). |
| 201 | * |
| 202 | * RFC 8446 section 4.2.11.1 |
| 203 | * |
| 204 | * Clients MUST NOT attempt to use tickets which have ages greater than |
| 205 | * the "ticket_lifetime" value which was provided with the ticket. |
| 206 | * |
| 207 | * For time being, the age MUST be less than 604800 seconds (7 days). |
| 208 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 209 | if (age_in_s > 604800) { |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 210 | MBEDTLS_SSL_DEBUG_MSG( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 211 | 3, ("Ticket age exceeds limitation ticket_age=%lu", |
| 212 | (long unsigned int) age_in_s)); |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 213 | goto exit; |
| 214 | } |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 215 | |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 216 | /* RFC 8446 section 4.2.10 |
| 217 | * |
| 218 | * For PSKs provisioned via NewSessionTicket, a server MUST validate that |
| 219 | * the ticket age for the selected PSK identity (computed by subtracting |
| 220 | * ticket_age_add from PskIdentity.obfuscated_ticket_age modulo 2^32) is |
| 221 | * within a small tolerance of the time since the ticket was issued. |
Jerry Yu | f7dad3c | 2022-09-14 22:31:39 +0800 | [diff] [blame] | 222 | * |
Jerry Yu | 0a55cc6 | 2022-09-15 16:15:06 +0800 | [diff] [blame] | 223 | * NOTE: When `now == session->start`, `age_diff_in_ms` may be negative |
| 224 | * as the age units are different on the server (s) and in the |
| 225 | * client (ms) side. Add a -1000 ms tolerance window to take this |
| 226 | * into account. |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 227 | */ |
Jerry Yu | f7dad3c | 2022-09-14 22:31:39 +0800 | [diff] [blame] | 228 | age_diff_in_ms = age_in_s * 1000; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 229 | age_diff_in_ms -= (obfuscated_ticket_age - session->ticket_age_add); |
| 230 | if (age_diff_in_ms <= -1000 || |
| 231 | age_diff_in_ms > MBEDTLS_SSL_TLS1_3_TICKET_AGE_TOLERANCE) { |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 232 | MBEDTLS_SSL_DEBUG_MSG( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 233 | 3, ("Ticket age outside tolerance window ( diff=%d )", |
| 234 | (int) age_diff_in_ms)); |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 235 | goto exit; |
| 236 | } |
| 237 | |
| 238 | ret = 0; |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 239 | |
| 240 | #endif /* MBEDTLS_HAVE_TIME */ |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 241 | |
| 242 | exit: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 243 | if (ret != 0) { |
| 244 | mbedtls_ssl_session_free(session); |
| 245 | } |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 246 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 247 | MBEDTLS_SSL_DEBUG_MSG(2, ("<= check_identity_match_ticket")); |
| 248 | return ret; |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 249 | } |
| 250 | #endif /* MBEDTLS_SSL_SESSION_TICKETS */ |
| 251 | |
Jerry Yu | 6e74a7e | 2022-07-20 20:49:32 +0800 | [diff] [blame] | 252 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 253 | static int ssl_tls13_offered_psks_check_identity_match( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 254 | mbedtls_ssl_context *ssl, |
| 255 | const unsigned char *identity, |
| 256 | size_t identity_len, |
| 257 | uint32_t obfuscated_ticket_age, |
| 258 | int *psk_type, |
| 259 | mbedtls_ssl_session *session) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 260 | { |
Ronald Cron | 606671e | 2023-02-17 11:36:33 +0100 | [diff] [blame] | 261 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 262 | |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 263 | ((void) session); |
| 264 | ((void) obfuscated_ticket_age); |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 265 | *psk_type = MBEDTLS_SSL_TLS1_3_PSK_EXTERNAL; |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 266 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 267 | MBEDTLS_SSL_DEBUG_BUF(4, "identity", identity, identity_len); |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 268 | ssl->handshake->resume = 0; |
| 269 | |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 270 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 271 | if (ssl_tls13_offered_psks_check_identity_match_ticket( |
Jerry Yu | 8d4bbba | 2022-09-13 14:15:48 +0800 | [diff] [blame] | 272 | ssl, identity, identity_len, obfuscated_ticket_age, |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 273 | session) == SSL_TLS1_3_OFFERED_PSK_MATCH) { |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 274 | ssl->handshake->resume = 1; |
| 275 | *psk_type = MBEDTLS_SSL_TLS1_3_PSK_RESUMPTION; |
Ronald Cron | 606671e | 2023-02-17 11:36:33 +0100 | [diff] [blame] | 276 | ret = mbedtls_ssl_set_hs_psk(ssl, |
| 277 | session->resumption_key, |
| 278 | session->resumption_key_len); |
| 279 | if (ret != 0) { |
| 280 | MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_set_hs_psk", ret); |
| 281 | return ret; |
| 282 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 283 | |
| 284 | MBEDTLS_SSL_DEBUG_BUF(4, "Ticket-resumed PSK:", |
| 285 | session->resumption_key, |
| 286 | session->resumption_key_len); |
| 287 | MBEDTLS_SSL_DEBUG_MSG(4, ("ticket: obfuscated_ticket_age: %u", |
| 288 | (unsigned) obfuscated_ticket_age)); |
| 289 | return SSL_TLS1_3_OFFERED_PSK_MATCH; |
Jerry Yu | 95699e7 | 2022-08-21 19:22:23 +0800 | [diff] [blame] | 290 | } |
| 291 | #endif /* MBEDTLS_SSL_SESSION_TICKETS */ |
| 292 | |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 293 | /* Check identity with external configured function */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 294 | if (ssl->conf->f_psk != NULL) { |
| 295 | if (ssl->conf->f_psk( |
| 296 | ssl->conf->p_psk, ssl, identity, identity_len) == 0) { |
| 297 | return SSL_TLS1_3_OFFERED_PSK_MATCH; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 298 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 299 | return SSL_TLS1_3_OFFERED_PSK_NOT_MATCH; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 300 | } |
| 301 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 302 | MBEDTLS_SSL_DEBUG_BUF(5, "identity", identity, identity_len); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 303 | /* Check identity with pre-configured psk */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 304 | if (ssl->conf->psk_identity != NULL && |
Jerry Yu | 2f0abc9 | 2022-07-22 19:34:48 +0800 | [diff] [blame] | 305 | identity_len == ssl->conf->psk_identity_len && |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 306 | mbedtls_ct_memcmp(ssl->conf->psk_identity, |
| 307 | identity, identity_len) == 0) { |
Ronald Cron | 606671e | 2023-02-17 11:36:33 +0100 | [diff] [blame] | 308 | ret = mbedtls_ssl_set_hs_psk(ssl, ssl->conf->psk, ssl->conf->psk_len); |
| 309 | if (ret != 0) { |
| 310 | MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_set_hs_psk", ret); |
| 311 | return ret; |
| 312 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 313 | return SSL_TLS1_3_OFFERED_PSK_MATCH; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 314 | } |
| 315 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 316 | return SSL_TLS1_3_OFFERED_PSK_NOT_MATCH; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 317 | } |
| 318 | |
Jerry Yu | 6e74a7e | 2022-07-20 20:49:32 +0800 | [diff] [blame] | 319 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 320 | static int ssl_tls13_offered_psks_check_binder_match(mbedtls_ssl_context *ssl, |
| 321 | const unsigned char *binder, |
| 322 | size_t binder_len, |
| 323 | int psk_type, |
| 324 | psa_algorithm_t psk_hash_alg) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 325 | { |
| 326 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 327 | |
Jerry Yu | daf375a | 2022-07-20 21:31:43 +0800 | [diff] [blame] | 328 | unsigned char transcript[PSA_HASH_MAX_SIZE]; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 329 | size_t transcript_len; |
Jerry Yu | 2f0abc9 | 2022-07-22 19:34:48 +0800 | [diff] [blame] | 330 | unsigned char *psk; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 331 | size_t psk_len; |
Jerry Yu | daf375a | 2022-07-20 21:31:43 +0800 | [diff] [blame] | 332 | unsigned char server_computed_binder[PSA_HASH_MAX_SIZE]; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 333 | |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 334 | /* Get current state of handshake transcript. */ |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 335 | ret = mbedtls_ssl_get_handshake_transcript( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 336 | ssl, mbedtls_hash_info_md_from_psa(psk_hash_alg), |
| 337 | transcript, sizeof(transcript), &transcript_len); |
| 338 | if (ret != 0) { |
| 339 | return ret; |
| 340 | } |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 341 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 342 | ret = mbedtls_ssl_tls13_export_handshake_psk(ssl, &psk, &psk_len); |
| 343 | if (ret != 0) { |
| 344 | return ret; |
| 345 | } |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 346 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 347 | ret = mbedtls_ssl_tls13_create_psk_binder(ssl, psk_hash_alg, |
| 348 | psk, psk_len, psk_type, |
| 349 | transcript, |
| 350 | server_computed_binder); |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 351 | #if defined(MBEDTLS_USE_PSA_CRYPTO) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 352 | mbedtls_free((void *) psk); |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 353 | #endif |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 354 | if (ret != 0) { |
| 355 | MBEDTLS_SSL_DEBUG_MSG(1, ("PSK binder calculation failed.")); |
| 356 | return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 357 | } |
| 358 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 359 | MBEDTLS_SSL_DEBUG_BUF(3, "psk binder ( computed ): ", |
| 360 | server_computed_binder, transcript_len); |
| 361 | MBEDTLS_SSL_DEBUG_BUF(3, "psk binder ( received ): ", binder, binder_len); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 362 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 363 | if (mbedtls_ct_memcmp(server_computed_binder, binder, binder_len) == 0) { |
| 364 | return SSL_TLS1_3_OFFERED_PSK_MATCH; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 365 | } |
| 366 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 367 | mbedtls_platform_zeroize(server_computed_binder, |
| 368 | sizeof(server_computed_binder)); |
| 369 | return SSL_TLS1_3_OFFERED_PSK_NOT_MATCH; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 370 | } |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 371 | |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 372 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 373 | static int ssl_tls13_select_ciphersuite_for_psk( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 374 | mbedtls_ssl_context *ssl, |
| 375 | const unsigned char *cipher_suites, |
| 376 | const unsigned char *cipher_suites_end, |
| 377 | uint16_t *selected_ciphersuite, |
| 378 | const mbedtls_ssl_ciphersuite_t **selected_ciphersuite_info) |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 379 | { |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 380 | psa_algorithm_t psk_hash_alg = PSA_ALG_SHA_256; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 381 | |
Jerry Yu | 0baf907 | 2022-08-25 11:21:04 +0800 | [diff] [blame] | 382 | *selected_ciphersuite = 0; |
| 383 | *selected_ciphersuite_info = NULL; |
| 384 | |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 385 | /* RFC 8446, page 55. |
| 386 | * |
| 387 | * For externally established PSKs, the Hash algorithm MUST be set when the |
| 388 | * PSK is established or default to SHA-256 if no such algorithm is defined. |
| 389 | * |
| 390 | */ |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 391 | |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 392 | /* |
| 393 | * Search for a matching ciphersuite |
| 394 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 395 | for (const unsigned char *p = cipher_suites; |
| 396 | p < cipher_suites_end; p += 2) { |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 397 | uint16_t cipher_suite; |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 398 | const mbedtls_ssl_ciphersuite_t *ciphersuite_info; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 399 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 400 | cipher_suite = MBEDTLS_GET_UINT16_BE(p, 0); |
| 401 | ciphersuite_info = ssl_tls13_validate_peer_ciphersuite(ssl, |
| 402 | cipher_suite); |
| 403 | if (ciphersuite_info == NULL) { |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 404 | continue; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 405 | } |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 406 | |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 407 | /* MAC of selected ciphersuite MUST be same with PSK binder if exist. |
| 408 | * Otherwise, client should reject. |
| 409 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 410 | if (psk_hash_alg == mbedtls_psa_translate_md(ciphersuite_info->mac)) { |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 411 | *selected_ciphersuite = cipher_suite; |
| 412 | *selected_ciphersuite_info = ciphersuite_info; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 413 | return 0; |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 414 | } |
| 415 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 416 | MBEDTLS_SSL_DEBUG_MSG(2, ("No matched ciphersuite")); |
| 417 | return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE; |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 418 | } |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 419 | |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 420 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 421 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 422 | static int ssl_tls13_select_ciphersuite_for_resumption( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 423 | mbedtls_ssl_context *ssl, |
| 424 | const unsigned char *cipher_suites, |
| 425 | const unsigned char *cipher_suites_end, |
| 426 | mbedtls_ssl_session *session, |
| 427 | uint16_t *selected_ciphersuite, |
| 428 | const mbedtls_ssl_ciphersuite_t **selected_ciphersuite_info) |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 429 | { |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 430 | |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 431 | *selected_ciphersuite = 0; |
| 432 | *selected_ciphersuite_info = NULL; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 433 | for (const unsigned char *p = cipher_suites; p < cipher_suites_end; p += 2) { |
| 434 | uint16_t cipher_suite = MBEDTLS_GET_UINT16_BE(p, 0); |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 435 | const mbedtls_ssl_ciphersuite_t *ciphersuite_info; |
| 436 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 437 | if (cipher_suite != session->ciphersuite) { |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 438 | continue; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 439 | } |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 440 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 441 | ciphersuite_info = ssl_tls13_validate_peer_ciphersuite(ssl, |
| 442 | cipher_suite); |
| 443 | if (ciphersuite_info == NULL) { |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 444 | continue; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 445 | } |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 446 | |
Jerry Yu | 4746b10 | 2022-09-13 11:11:48 +0800 | [diff] [blame] | 447 | *selected_ciphersuite = cipher_suite; |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 448 | *selected_ciphersuite_info = ciphersuite_info; |
| 449 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 450 | return 0; |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 451 | } |
| 452 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 453 | return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 454 | } |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 455 | |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 456 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 457 | static int ssl_tls13_session_copy_ticket(mbedtls_ssl_session *dst, |
| 458 | const mbedtls_ssl_session *src) |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 459 | { |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 460 | dst->ticket_age_add = src->ticket_age_add; |
| 461 | dst->ticket_flags = src->ticket_flags; |
| 462 | dst->resumption_key_len = src->resumption_key_len; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 463 | if (src->resumption_key_len == 0) { |
| 464 | return MBEDTLS_ERR_SSL_INTERNAL_ERROR; |
| 465 | } |
| 466 | memcpy(dst->resumption_key, src->resumption_key, src->resumption_key_len); |
Jerry Yu | 4746b10 | 2022-09-13 11:11:48 +0800 | [diff] [blame] | 467 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 468 | return 0; |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 469 | } |
| 470 | #endif /* MBEDTLS_SSL_SESSION_TICKETS */ |
| 471 | |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 472 | /* Parser for pre_shared_key extension in client hello |
| 473 | * struct { |
| 474 | * opaque identity<1..2^16-1>; |
| 475 | * uint32 obfuscated_ticket_age; |
| 476 | * } PskIdentity; |
| 477 | * |
| 478 | * opaque PskBinderEntry<32..255>; |
| 479 | * |
| 480 | * struct { |
| 481 | * PskIdentity identities<7..2^16-1>; |
| 482 | * PskBinderEntry binders<33..2^16-1>; |
| 483 | * } OfferedPsks; |
| 484 | * |
| 485 | * struct { |
| 486 | * select (Handshake.msg_type) { |
| 487 | * case client_hello: OfferedPsks; |
| 488 | * .... |
| 489 | * }; |
| 490 | * } PreSharedKeyExtension; |
| 491 | */ |
Jerry Yu | 6e74a7e | 2022-07-20 20:49:32 +0800 | [diff] [blame] | 492 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 493 | static int ssl_tls13_parse_pre_shared_key_ext(mbedtls_ssl_context *ssl, |
| 494 | const unsigned char *pre_shared_key_ext, |
| 495 | const unsigned char *pre_shared_key_ext_end, |
| 496 | const unsigned char *ciphersuites, |
| 497 | const unsigned char *ciphersuites_end) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 498 | { |
Manuel Pégourié-Gonnard | b8b07aa | 2023-02-06 00:34:21 +0100 | [diff] [blame] | 499 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 500 | const unsigned char *identities = pre_shared_key_ext; |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 501 | const unsigned char *p_identity_len; |
| 502 | size_t identities_len; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 503 | const unsigned char *identities_end; |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 504 | const unsigned char *binders; |
| 505 | const unsigned char *p_binder_len; |
| 506 | size_t binders_len; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 507 | const unsigned char *binders_end; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 508 | int matched_identity = -1; |
| 509 | int identity_id = -1; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 510 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 511 | MBEDTLS_SSL_DEBUG_BUF(3, "pre_shared_key extension", |
| 512 | pre_shared_key_ext, |
| 513 | pre_shared_key_ext_end - pre_shared_key_ext); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 514 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 515 | /* identities_len 2 bytes |
| 516 | * identities_data >= 7 bytes |
| 517 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 518 | MBEDTLS_SSL_CHK_BUF_READ_PTR(identities, pre_shared_key_ext_end, 7 + 2); |
| 519 | identities_len = MBEDTLS_GET_UINT16_BE(identities, 0); |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 520 | p_identity_len = identities + 2; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 521 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p_identity_len, pre_shared_key_ext_end, |
| 522 | identities_len); |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 523 | identities_end = p_identity_len + identities_len; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 524 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 525 | /* binders_len 2 bytes |
| 526 | * binders >= 33 bytes |
| 527 | */ |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 528 | binders = identities_end; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 529 | MBEDTLS_SSL_CHK_BUF_READ_PTR(binders, pre_shared_key_ext_end, 33 + 2); |
| 530 | binders_len = MBEDTLS_GET_UINT16_BE(binders, 0); |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 531 | p_binder_len = binders + 2; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 532 | 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] | 533 | binders_end = p_binder_len + binders_len; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 534 | |
Manuel Pégourié-Gonnard | b8b07aa | 2023-02-06 00:34:21 +0100 | [diff] [blame] | 535 | ret = ssl->handshake->update_checksum(ssl, pre_shared_key_ext, |
| 536 | identities_end - pre_shared_key_ext); |
| 537 | if (0 != ret) { |
| 538 | MBEDTLS_SSL_DEBUG_RET(1, ("update_checksum"), ret); |
| 539 | return ret; |
| 540 | } |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 541 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 542 | while (p_identity_len < identities_end && p_binder_len < binders_end) { |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 543 | const unsigned char *identity; |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 544 | size_t identity_len; |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 545 | uint32_t obfuscated_ticket_age; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 546 | const unsigned char *binder; |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 547 | size_t binder_len; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 548 | int psk_type; |
| 549 | uint16_t cipher_suite; |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 550 | const mbedtls_ssl_ciphersuite_t *ciphersuite_info; |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 551 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
| 552 | mbedtls_ssl_session session; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 553 | mbedtls_ssl_session_init(&session); |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 554 | #endif |
Jerry Yu | bb85202 | 2022-07-20 21:10:44 +0800 | [diff] [blame] | 555 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 556 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p_identity_len, identities_end, 2 + 1 + 4); |
| 557 | identity_len = MBEDTLS_GET_UINT16_BE(p_identity_len, 0); |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 558 | identity = p_identity_len + 2; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 559 | MBEDTLS_SSL_CHK_BUF_READ_PTR(identity, identities_end, identity_len + 4); |
| 560 | obfuscated_ticket_age = MBEDTLS_GET_UINT32_BE(identity, identity_len); |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 561 | p_identity_len += identity_len + 6; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 562 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 563 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p_binder_len, binders_end, 1 + 32); |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 564 | binder_len = *p_binder_len; |
| 565 | binder = p_binder_len + 1; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 566 | MBEDTLS_SSL_CHK_BUF_READ_PTR(binder, binders_end, binder_len); |
Jerry Yu | 568ec25 | 2022-07-22 21:27:34 +0800 | [diff] [blame] | 567 | p_binder_len += binder_len + 1; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 568 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 569 | identity_id++; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 570 | if (matched_identity != -1) { |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 571 | continue; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 572 | } |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 573 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 574 | ret = ssl_tls13_offered_psks_check_identity_match( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 575 | ssl, identity, identity_len, obfuscated_ticket_age, |
| 576 | &psk_type, &session); |
| 577 | if (ret != SSL_TLS1_3_OFFERED_PSK_MATCH) { |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 578 | continue; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 579 | } |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 580 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 581 | MBEDTLS_SSL_DEBUG_MSG(4, ("found matched identity")); |
| 582 | switch (psk_type) { |
Jerry Yu | 0baf907 | 2022-08-25 11:21:04 +0800 | [diff] [blame] | 583 | case MBEDTLS_SSL_TLS1_3_PSK_EXTERNAL: |
| 584 | ret = ssl_tls13_select_ciphersuite_for_psk( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 585 | ssl, ciphersuites, ciphersuites_end, |
| 586 | &cipher_suite, &ciphersuite_info); |
Jerry Yu | 0baf907 | 2022-08-25 11:21:04 +0800 | [diff] [blame] | 587 | break; |
| 588 | case MBEDTLS_SSL_TLS1_3_PSK_RESUMPTION: |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 589 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
Jerry Yu | 0baf907 | 2022-08-25 11:21:04 +0800 | [diff] [blame] | 590 | ret = ssl_tls13_select_ciphersuite_for_resumption( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 591 | ssl, ciphersuites, ciphersuites_end, &session, |
| 592 | &cipher_suite, &ciphersuite_info); |
| 593 | if (ret != 0) { |
| 594 | mbedtls_ssl_session_free(&session); |
| 595 | } |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 596 | #else |
| 597 | ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; |
| 598 | #endif |
Jerry Yu | 0baf907 | 2022-08-25 11:21:04 +0800 | [diff] [blame] | 599 | break; |
| 600 | default: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 601 | return MBEDTLS_ERR_SSL_INTERNAL_ERROR; |
Jerry Yu | 0baf907 | 2022-08-25 11:21:04 +0800 | [diff] [blame] | 602 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 603 | if (ret != 0) { |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 604 | /* See below, no cipher_suite available, abort handshake */ |
| 605 | MBEDTLS_SSL_PEND_FATAL_ALERT( |
| 606 | MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR, |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 607 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE); |
Jerry Yu | f35ba38 | 2022-08-23 17:58:26 +0800 | [diff] [blame] | 608 | MBEDTLS_SSL_DEBUG_RET( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 609 | 2, "ssl_tls13_select_ciphersuite", ret); |
| 610 | return ret; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 611 | } |
| 612 | |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 613 | ret = ssl_tls13_offered_psks_check_binder_match( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 614 | ssl, binder, binder_len, psk_type, |
| 615 | mbedtls_psa_translate_md(ciphersuite_info->mac)); |
| 616 | if (ret != SSL_TLS1_3_OFFERED_PSK_MATCH) { |
Jerry Yu | c5a23a0 | 2022-08-25 10:51:44 +0800 | [diff] [blame] | 617 | /* For security reasons, the handshake should be aborted when we |
| 618 | * fail to validate a binder value. See RFC 8446 section 4.2.11.2 |
| 619 | * and appendix E.6. */ |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 620 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 621 | mbedtls_ssl_session_free(&session); |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 622 | #endif |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 623 | MBEDTLS_SSL_DEBUG_MSG(3, ("Invalid binder.")); |
| 624 | MBEDTLS_SSL_DEBUG_RET(1, |
| 625 | "ssl_tls13_offered_psks_check_binder_match", ret); |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 626 | MBEDTLS_SSL_PEND_FATAL_ALERT( |
| 627 | MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR, |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 628 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE); |
| 629 | return ret; |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 630 | } |
Jerry Yu | 96a2e36 | 2022-07-21 15:11:34 +0800 | [diff] [blame] | 631 | |
| 632 | matched_identity = identity_id; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 633 | |
| 634 | /* Update handshake parameters */ |
Jerry Yu | e5834fd | 2022-08-29 20:16:09 +0800 | [diff] [blame] | 635 | ssl->handshake->ciphersuite_info = ciphersuite_info; |
Jerry Yu | 4746b10 | 2022-09-13 11:11:48 +0800 | [diff] [blame] | 636 | ssl->session_negotiate->ciphersuite = cipher_suite; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 637 | MBEDTLS_SSL_DEBUG_MSG(2, ("overwrite ciphersuite: %04x - %s", |
| 638 | cipher_suite, ciphersuite_info->name)); |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 639 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 640 | if (psk_type == MBEDTLS_SSL_TLS1_3_PSK_RESUMPTION) { |
| 641 | ret = ssl_tls13_session_copy_ticket(ssl->session_negotiate, |
| 642 | &session); |
| 643 | mbedtls_ssl_session_free(&session); |
| 644 | if (ret != 0) { |
| 645 | return ret; |
| 646 | } |
Jerry Yu | 8253486 | 2022-08-30 10:42:33 +0800 | [diff] [blame] | 647 | } |
| 648 | #endif /* MBEDTLS_SSL_SESSION_TICKETS */ |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 649 | } |
| 650 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 651 | if (p_identity_len != identities_end || p_binder_len != binders_end) { |
| 652 | MBEDTLS_SSL_DEBUG_MSG(3, ("pre_shared_key extension decode error")); |
| 653 | MBEDTLS_SSL_PEND_FATAL_ALERT(MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR, |
| 654 | MBEDTLS_ERR_SSL_DECODE_ERROR); |
| 655 | return MBEDTLS_ERR_SSL_DECODE_ERROR; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 656 | } |
| 657 | |
Jerry Yu | 6f1db3f | 2022-07-22 23:05:59 +0800 | [diff] [blame] | 658 | /* Update the handshake transcript with the binder list. */ |
Manuel Pégourié-Gonnard | b8b07aa | 2023-02-06 00:34:21 +0100 | [diff] [blame] | 659 | ret = ssl->handshake->update_checksum(ssl, |
| 660 | identities_end, |
| 661 | (size_t) (binders_end - identities_end)); |
| 662 | if (0 != ret) { |
| 663 | MBEDTLS_SSL_DEBUG_RET(1, ("update_checksum"), ret); |
| 664 | return ret; |
| 665 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 666 | if (matched_identity == -1) { |
| 667 | MBEDTLS_SSL_DEBUG_MSG(3, ("No matched PSK or ticket.")); |
| 668 | return MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 669 | } |
| 670 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 671 | ssl->handshake->selected_identity = (uint16_t) matched_identity; |
| 672 | MBEDTLS_SSL_DEBUG_MSG(3, ("Pre shared key found")); |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 673 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 674 | return 0; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 675 | } |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 676 | |
| 677 | /* |
| 678 | * struct { |
| 679 | * select ( Handshake.msg_type ) { |
| 680 | * .... |
| 681 | * case server_hello: |
| 682 | * uint16 selected_identity; |
| 683 | * } |
| 684 | * } PreSharedKeyExtension; |
| 685 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 686 | static int ssl_tls13_write_server_pre_shared_key_ext(mbedtls_ssl_context *ssl, |
| 687 | unsigned char *buf, |
| 688 | unsigned char *end, |
| 689 | size_t *olen) |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 690 | { |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 691 | unsigned char *p = (unsigned char *) buf; |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 692 | |
| 693 | *olen = 0; |
| 694 | |
David Horstmann | 21b8976 | 2022-10-06 18:34:28 +0100 | [diff] [blame] | 695 | int not_using_psk = 0; |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 696 | #if defined(MBEDTLS_USE_PSA_CRYPTO) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 697 | not_using_psk = (mbedtls_svc_key_id_is_null(ssl->handshake->psk_opaque)); |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 698 | #else |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 699 | not_using_psk = (ssl->handshake->psk == NULL); |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 700 | #endif |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 701 | if (not_using_psk) { |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 702 | /* We shouldn't have called this extension writer unless we've |
| 703 | * chosen to use a PSK. */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 704 | return MBEDTLS_ERR_SSL_INTERNAL_ERROR; |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 705 | } |
| 706 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 707 | MBEDTLS_SSL_DEBUG_MSG(3, ("server hello, adding pre_shared_key extension")); |
| 708 | MBEDTLS_SSL_CHK_BUF_PTR(p, end, 6); |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 709 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 710 | MBEDTLS_PUT_UINT16_BE(MBEDTLS_TLS_EXT_PRE_SHARED_KEY, p, 0); |
| 711 | MBEDTLS_PUT_UINT16_BE(2, p, 2); |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 712 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 713 | MBEDTLS_PUT_UINT16_BE(ssl->handshake->selected_identity, p, 4); |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 714 | |
| 715 | *olen = 6; |
| 716 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 717 | MBEDTLS_SSL_DEBUG_MSG(4, ("sent selected_identity: %u", |
| 718 | ssl->handshake->selected_identity)); |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 719 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 720 | mbedtls_ssl_tls13_set_hs_sent_ext_mask(ssl, MBEDTLS_TLS_EXT_PRE_SHARED_KEY); |
Jerry Yu | b95dd36 | 2022-11-08 21:19:34 +0800 | [diff] [blame] | 721 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 722 | return 0; |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 723 | } |
| 724 | |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 725 | #endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED */ |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 726 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 727 | /* From RFC 8446: |
| 728 | * struct { |
XiaokangQian | cfd925f | 2022-04-14 07:10:37 +0000 | [diff] [blame] | 729 | * ProtocolVersion versions<2..254>; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 730 | * } SupportedVersions; |
| 731 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 732 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 733 | static int ssl_tls13_parse_supported_versions_ext(mbedtls_ssl_context *ssl, |
| 734 | const unsigned char *buf, |
| 735 | const unsigned char *end) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 736 | { |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 737 | const unsigned char *p = buf; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 738 | size_t versions_len; |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 739 | const unsigned char *versions_end; |
XiaokangQian | 0a1b54e | 2022-04-21 03:01:38 +0000 | [diff] [blame] | 740 | uint16_t tls_version; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 741 | int tls13_supported = 0; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 742 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 743 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, 1); |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 744 | versions_len = p[0]; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 745 | p += 1; |
| 746 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 747 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, versions_len); |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 748 | versions_end = p + versions_len; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 749 | while (p < versions_end) { |
| 750 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p, versions_end, 2); |
| 751 | tls_version = mbedtls_ssl_read_version(p, ssl->conf->transport); |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 752 | p += 2; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 753 | |
| 754 | /* In this implementation we only support TLS 1.3 and DTLS 1.3. */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 755 | if (tls_version == MBEDTLS_SSL_VERSION_TLS1_3) { |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 756 | tls13_supported = 1; |
| 757 | break; |
| 758 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 759 | } |
| 760 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 761 | if (!tls13_supported) { |
| 762 | MBEDTLS_SSL_DEBUG_MSG(1, ("TLS 1.3 is not supported by the client")); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 763 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 764 | MBEDTLS_SSL_PEND_FATAL_ALERT(MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION, |
| 765 | MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION); |
| 766 | return MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 767 | } |
| 768 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 769 | MBEDTLS_SSL_DEBUG_MSG(1, ("Negotiated version. Supported is [%04x]", |
| 770 | (unsigned int) tls_version)); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 771 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 772 | return 0; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 773 | } |
| 774 | |
Valerio Setti | 080a22b | 2023-03-20 15:22:47 +0100 | [diff] [blame] | 775 | #if defined(PSA_WANT_ALG_ECDH) |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 776 | /* |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 777 | * |
| 778 | * From RFC 8446: |
| 779 | * enum { |
| 780 | * ... (0xFFFF) |
| 781 | * } NamedGroup; |
| 782 | * struct { |
| 783 | * NamedGroup named_group_list<2..2^16-1>; |
| 784 | * } NamedGroupList; |
| 785 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 786 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 787 | static int ssl_tls13_parse_supported_groups_ext(mbedtls_ssl_context *ssl, |
| 788 | const unsigned char *buf, |
| 789 | const unsigned char *end) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 790 | { |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 791 | const unsigned char *p = buf; |
XiaokangQian | 8482377 | 2022-04-19 07:57:30 +0000 | [diff] [blame] | 792 | size_t named_group_list_len; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 793 | const unsigned char *named_group_list_end; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 794 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 795 | MBEDTLS_SSL_DEBUG_BUF(3, "supported_groups extension", p, end - buf); |
| 796 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, 2); |
| 797 | named_group_list_len = MBEDTLS_GET_UINT16_BE(p, 0); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 798 | p += 2; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 799 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, named_group_list_len); |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 800 | named_group_list_end = p + named_group_list_len; |
XiaokangQian | 4e8cd7b | 2022-04-21 09:48:09 +0000 | [diff] [blame] | 801 | ssl->handshake->hrr_selected_group = 0; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 802 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 803 | while (p < named_group_list_end) { |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 804 | uint16_t named_group; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 805 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p, named_group_list_end, 2); |
| 806 | named_group = MBEDTLS_GET_UINT16_BE(p, 0); |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 807 | p += 2; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 808 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 809 | MBEDTLS_SSL_DEBUG_MSG(2, |
| 810 | ("got named group: %s(%04x)", |
| 811 | mbedtls_ssl_named_group_to_str(named_group), |
| 812 | named_group)); |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 813 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 814 | if (!mbedtls_ssl_named_group_is_offered(ssl, named_group) || |
| 815 | !mbedtls_ssl_named_group_is_supported(named_group) || |
| 816 | ssl->handshake->hrr_selected_group != 0) { |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 817 | continue; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 818 | } |
| 819 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 820 | MBEDTLS_SSL_DEBUG_MSG(2, |
| 821 | ("add named group %s(%04x) into received list.", |
| 822 | mbedtls_ssl_named_group_to_str(named_group), |
| 823 | named_group)); |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 824 | |
XiaokangQian | 4e8cd7b | 2022-04-21 09:48:09 +0000 | [diff] [blame] | 825 | ssl->handshake->hrr_selected_group = named_group; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 826 | } |
| 827 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 828 | return 0; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 829 | |
| 830 | } |
Valerio Setti | 080a22b | 2023-03-20 15:22:47 +0100 | [diff] [blame] | 831 | #endif /* PSA_WANT_ALG_ECDH */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 832 | |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 833 | #define SSL_TLS1_3_PARSE_KEY_SHARES_EXT_NO_MATCH 1 |
| 834 | |
Valerio Setti | 080a22b | 2023-03-20 15:22:47 +0100 | [diff] [blame] | 835 | #if defined(PSA_WANT_ALG_ECDH) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 836 | /* |
| 837 | * ssl_tls13_parse_key_shares_ext() verifies whether the information in the |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 838 | * 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] | 839 | * |
| 840 | * Possible return values are: |
| 841 | * - 0: Successful processing of the client provided key share extension. |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 842 | * - 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] | 843 | * does not match a group supported by the server. A HelloRetryRequest will |
| 844 | * be needed. |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 845 | * - A negative value for fatal errors. |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 846 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 847 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 848 | static int ssl_tls13_parse_key_shares_ext(mbedtls_ssl_context *ssl, |
| 849 | const unsigned char *buf, |
| 850 | const unsigned char *end) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 851 | { |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 852 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 853 | unsigned char const *p = buf; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 854 | unsigned char const *client_shares_end; |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 855 | size_t client_shares_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 856 | |
| 857 | /* From RFC 8446: |
| 858 | * |
| 859 | * struct { |
| 860 | * KeyShareEntry client_shares<0..2^16-1>; |
| 861 | * } KeyShareClientHello; |
| 862 | * |
| 863 | */ |
| 864 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 865 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, 2); |
| 866 | client_shares_len = MBEDTLS_GET_UINT16_BE(p, 0); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 867 | p += 2; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 868 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, client_shares_len); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 869 | |
| 870 | ssl->handshake->offered_group_id = 0; |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 871 | client_shares_end = p + client_shares_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 872 | |
| 873 | /* We try to find a suitable key share entry and copy it to the |
| 874 | * handshake context. Later, we have to find out whether we can do |
| 875 | * something with the provided key share or whether we have to |
XiaokangQian | c5763b5 | 2022-04-02 03:34:37 +0000 | [diff] [blame] | 876 | * dismiss it and send a HelloRetryRequest message. |
| 877 | */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 878 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 879 | while (p < client_shares_end) { |
XiaokangQian | 9b5d04b | 2022-04-10 10:20:43 +0000 | [diff] [blame] | 880 | uint16_t group; |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 881 | size_t key_exchange_len; |
Jerry Yu | 086edc2 | 2022-05-05 10:50:38 +0800 | [diff] [blame] | 882 | const unsigned char *key_exchange; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 883 | |
| 884 | /* |
| 885 | * struct { |
| 886 | * NamedGroup group; |
| 887 | * opaque key_exchange<1..2^16-1>; |
| 888 | * } KeyShareEntry; |
| 889 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 890 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p, client_shares_end, 4); |
| 891 | group = MBEDTLS_GET_UINT16_BE(p, 0); |
| 892 | key_exchange_len = MBEDTLS_GET_UINT16_BE(p, 2); |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 893 | p += 4; |
Jerry Yu | 086edc2 | 2022-05-05 10:50:38 +0800 | [diff] [blame] | 894 | key_exchange = p; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 895 | 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] | 896 | p += key_exchange_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 897 | |
| 898 | /* Continue parsing even if we have already found a match, |
XiaokangQian | c5763b5 | 2022-04-02 03:34:37 +0000 | [diff] [blame] | 899 | * for input validation purposes. |
| 900 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 901 | if (!mbedtls_ssl_named_group_is_offered(ssl, group) || |
| 902 | !mbedtls_ssl_named_group_is_supported(group) || |
| 903 | ssl->handshake->offered_group_id != 0) { |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 904 | continue; |
| 905 | } |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 906 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 907 | /* |
XiaokangQian | 8f9dfe4 | 2022-04-15 02:52:39 +0000 | [diff] [blame] | 908 | * For now, we only support ECDHE groups. |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 909 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 910 | if (mbedtls_ssl_tls13_named_group_is_ecdhe(group)) { |
| 911 | MBEDTLS_SSL_DEBUG_MSG(2, ("ECDH group: %s (%04x)", |
| 912 | mbedtls_ssl_named_group_to_str(group), |
| 913 | group)); |
XiaokangQian | 318dc76 | 2022-04-20 09:43:51 +0000 | [diff] [blame] | 914 | ret = mbedtls_ssl_tls13_read_public_ecdhe_share( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 915 | ssl, key_exchange - 2, key_exchange_len + 2); |
| 916 | if (ret != 0) { |
| 917 | return ret; |
| 918 | } |
XiaokangQian | 4e8cd7b | 2022-04-21 09:48:09 +0000 | [diff] [blame] | 919 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 920 | } else { |
| 921 | MBEDTLS_SSL_DEBUG_MSG(4, ("Unrecognized NamedGroup %u", |
| 922 | (unsigned) group)); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 923 | continue; |
| 924 | } |
| 925 | |
XiaokangQian | 9b5d04b | 2022-04-10 10:20:43 +0000 | [diff] [blame] | 926 | ssl->handshake->offered_group_id = group; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 927 | } |
| 928 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 929 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 930 | if (ssl->handshake->offered_group_id == 0) { |
| 931 | MBEDTLS_SSL_DEBUG_MSG(1, ("no matching key share")); |
| 932 | return SSL_TLS1_3_PARSE_KEY_SHARES_EXT_NO_MATCH; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 933 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 934 | return 0; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 935 | } |
Valerio Setti | 080a22b | 2023-03-20 15:22:47 +0100 | [diff] [blame] | 936 | #endif /* PSA_WANT_ALG_ECDH */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 937 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 938 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 939 | static int ssl_tls13_client_hello_has_exts(mbedtls_ssl_context *ssl, |
| 940 | int exts_mask) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 941 | { |
Jerry Yu | 0c354a2 | 2022-08-29 15:25:36 +0800 | [diff] [blame] | 942 | int masked = ssl->handshake->received_extensions & exts_mask; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 943 | return masked == exts_mask; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 944 | } |
| 945 | |
Jerry Yu | e599132 | 2022-11-07 14:03:44 +0800 | [diff] [blame] | 946 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED) |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 947 | MBEDTLS_CHECK_RETURN_CRITICAL |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 948 | static int ssl_tls13_client_hello_has_exts_for_ephemeral_key_exchange( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 949 | mbedtls_ssl_context *ssl) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 950 | { |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 951 | return ssl_tls13_client_hello_has_exts( |
| 952 | ssl, |
| 953 | MBEDTLS_SSL_EXT_MASK(SUPPORTED_GROUPS) | |
| 954 | MBEDTLS_SSL_EXT_MASK(KEY_SHARE) | |
| 955 | MBEDTLS_SSL_EXT_MASK(SIG_ALG)); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 956 | } |
Jerry Yu | e599132 | 2022-11-07 14:03:44 +0800 | [diff] [blame] | 957 | #endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 958 | |
Jerry Yu | e599132 | 2022-11-07 14:03:44 +0800 | [diff] [blame] | 959 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_ENABLED) |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 960 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 961 | static int ssl_tls13_client_hello_has_exts_for_psk_key_exchange( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 962 | mbedtls_ssl_context *ssl) |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 963 | { |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 964 | return ssl_tls13_client_hello_has_exts( |
| 965 | ssl, |
| 966 | MBEDTLS_SSL_EXT_MASK(PRE_SHARED_KEY) | |
| 967 | MBEDTLS_SSL_EXT_MASK(PSK_KEY_EXCHANGE_MODES)); |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 968 | } |
Jerry Yu | e599132 | 2022-11-07 14:03:44 +0800 | [diff] [blame] | 969 | #endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_ENABLED */ |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 970 | |
Jerry Yu | e599132 | 2022-11-07 14:03:44 +0800 | [diff] [blame] | 971 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL_ENABLED) |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 972 | MBEDTLS_CHECK_RETURN_CRITICAL |
| 973 | static int ssl_tls13_client_hello_has_exts_for_psk_ephemeral_key_exchange( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 974 | mbedtls_ssl_context *ssl) |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 975 | { |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 976 | return ssl_tls13_client_hello_has_exts( |
| 977 | ssl, |
| 978 | MBEDTLS_SSL_EXT_MASK(SUPPORTED_GROUPS) | |
| 979 | MBEDTLS_SSL_EXT_MASK(KEY_SHARE) | |
| 980 | MBEDTLS_SSL_EXT_MASK(PRE_SHARED_KEY) | |
| 981 | MBEDTLS_SSL_EXT_MASK(PSK_KEY_EXCHANGE_MODES)); |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 982 | } |
Jerry Yu | e599132 | 2022-11-07 14:03:44 +0800 | [diff] [blame] | 983 | #endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL_ENABLED */ |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 984 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 985 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 986 | static int ssl_tls13_check_ephemeral_key_exchange(mbedtls_ssl_context *ssl) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 987 | { |
Jerry Yu | e599132 | 2022-11-07 14:03:44 +0800 | [diff] [blame] | 988 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 989 | return mbedtls_ssl_conf_tls13_ephemeral_enabled(ssl) && |
| 990 | ssl_tls13_client_hello_has_exts_for_ephemeral_key_exchange(ssl); |
Jerry Yu | e599132 | 2022-11-07 14:03:44 +0800 | [diff] [blame] | 991 | #else |
| 992 | ((void) ssl); |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 993 | return 0; |
Jerry Yu | e599132 | 2022-11-07 14:03:44 +0800 | [diff] [blame] | 994 | #endif |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 995 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 996 | |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 997 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 998 | static int ssl_tls13_check_psk_key_exchange(mbedtls_ssl_context *ssl) |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 999 | { |
Jerry Yu | e599132 | 2022-11-07 14:03:44 +0800 | [diff] [blame] | 1000 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_ENABLED) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1001 | return mbedtls_ssl_conf_tls13_psk_enabled(ssl) && |
| 1002 | mbedtls_ssl_tls13_psk_enabled(ssl) && |
| 1003 | ssl_tls13_client_hello_has_exts_for_psk_key_exchange(ssl); |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1004 | #else |
| 1005 | ((void) ssl); |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1006 | return 0; |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1007 | #endif |
| 1008 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1009 | |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1010 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1011 | static int ssl_tls13_check_psk_ephemeral_key_exchange(mbedtls_ssl_context *ssl) |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1012 | { |
Jerry Yu | e599132 | 2022-11-07 14:03:44 +0800 | [diff] [blame] | 1013 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL_ENABLED) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1014 | return mbedtls_ssl_conf_tls13_psk_ephemeral_enabled(ssl) && |
| 1015 | mbedtls_ssl_tls13_psk_ephemeral_enabled(ssl) && |
| 1016 | ssl_tls13_client_hello_has_exts_for_psk_ephemeral_key_exchange(ssl); |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1017 | #else |
| 1018 | ((void) ssl); |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1019 | return 0; |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1020 | #endif |
| 1021 | } |
| 1022 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1023 | static int ssl_tls13_determine_key_exchange_mode(mbedtls_ssl_context *ssl) |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1024 | { |
| 1025 | /* |
| 1026 | * Determine the key exchange algorithm to use. |
| 1027 | * There are three types of key exchanges supported in TLS 1.3: |
| 1028 | * - (EC)DH with ECDSA, |
| 1029 | * - (EC)DH with PSK, |
| 1030 | * - plain PSK. |
| 1031 | * |
| 1032 | * The PSK-based key exchanges may additionally be used with 0-RTT. |
| 1033 | * |
| 1034 | * Our built-in order of preference is |
Jerry Yu | ce6ed70 | 2022-07-22 21:49:53 +0800 | [diff] [blame] | 1035 | * 1 ) (EC)DHE-PSK Mode ( psk_ephemeral ) |
| 1036 | * 2 ) Certificate Mode ( ephemeral ) |
| 1037 | * 3 ) Plain PSK Mode ( psk ) |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1038 | */ |
| 1039 | |
| 1040 | ssl->handshake->key_exchange_mode = MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_NONE; |
| 1041 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1042 | if (ssl_tls13_check_psk_ephemeral_key_exchange(ssl)) { |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1043 | ssl->handshake->key_exchange_mode = |
| 1044 | MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1045 | MBEDTLS_SSL_DEBUG_MSG(2, ("key exchange mode: psk_ephemeral")); |
| 1046 | } else |
| 1047 | if (ssl_tls13_check_ephemeral_key_exchange(ssl)) { |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1048 | ssl->handshake->key_exchange_mode = |
| 1049 | MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1050 | MBEDTLS_SSL_DEBUG_MSG(2, ("key exchange mode: ephemeral")); |
| 1051 | } else |
| 1052 | if (ssl_tls13_check_psk_key_exchange(ssl)) { |
Jerry Yu | ce6ed70 | 2022-07-22 21:49:53 +0800 | [diff] [blame] | 1053 | ssl->handshake->key_exchange_mode = |
| 1054 | MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1055 | MBEDTLS_SSL_DEBUG_MSG(2, ("key exchange mode: psk")); |
| 1056 | } else { |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1057 | MBEDTLS_SSL_DEBUG_MSG( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1058 | 1, |
| 1059 | ("ClientHello message misses mandatory extensions.")); |
| 1060 | MBEDTLS_SSL_PEND_FATAL_ALERT(MBEDTLS_SSL_ALERT_MSG_MISSING_EXTENSION, |
| 1061 | MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER); |
| 1062 | return MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER; |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1063 | } |
| 1064 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1065 | return 0; |
Jerry Yu | 77f0148 | 2022-07-11 07:03:24 +0000 | [diff] [blame] | 1066 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1067 | } |
| 1068 | |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1069 | #if defined(MBEDTLS_X509_CRT_PARSE_C) && \ |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 1070 | defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED) |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1071 | |
| 1072 | #if defined(MBEDTLS_USE_PSA_CRYPTO) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1073 | static psa_algorithm_t ssl_tls13_iana_sig_alg_to_psa_alg(uint16_t sig_alg) |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1074 | { |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1075 | switch (sig_alg) { |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1076 | case MBEDTLS_TLS1_3_SIG_ECDSA_SECP256R1_SHA256: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1077 | return PSA_ALG_ECDSA(PSA_ALG_SHA_256); |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1078 | case MBEDTLS_TLS1_3_SIG_ECDSA_SECP384R1_SHA384: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1079 | return PSA_ALG_ECDSA(PSA_ALG_SHA_384); |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1080 | case MBEDTLS_TLS1_3_SIG_ECDSA_SECP521R1_SHA512: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1081 | return PSA_ALG_ECDSA(PSA_ALG_SHA_512); |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1082 | case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1083 | return PSA_ALG_RSA_PSS(PSA_ALG_SHA_256); |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1084 | case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA384: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1085 | return PSA_ALG_RSA_PSS(PSA_ALG_SHA_384); |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1086 | case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA512: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1087 | return PSA_ALG_RSA_PSS(PSA_ALG_SHA_512); |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1088 | case MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA256: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1089 | return PSA_ALG_RSA_PKCS1V15_SIGN(PSA_ALG_SHA_256); |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1090 | case MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA384: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1091 | return PSA_ALG_RSA_PKCS1V15_SIGN(PSA_ALG_SHA_384); |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1092 | case MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA512: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1093 | return PSA_ALG_RSA_PKCS1V15_SIGN(PSA_ALG_SHA_512); |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1094 | default: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1095 | return PSA_ALG_NONE; |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1096 | } |
| 1097 | } |
| 1098 | #endif /* MBEDTLS_USE_PSA_CRYPTO */ |
| 1099 | |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1100 | /* |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1101 | * Pick best ( private key, certificate chain ) pair based on the signature |
| 1102 | * algorithms supported by the client. |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1103 | */ |
Ronald Cron | ce7d76e | 2022-07-08 18:56:49 +0200 | [diff] [blame] | 1104 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1105 | static int ssl_tls13_pick_key_cert(mbedtls_ssl_context *ssl) |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1106 | { |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1107 | mbedtls_ssl_key_cert *key_cert, *key_cert_list; |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1108 | const uint16_t *sig_alg = ssl->handshake->received_sig_algs; |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1109 | |
| 1110 | #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1111 | if (ssl->handshake->sni_key_cert != NULL) { |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1112 | key_cert_list = ssl->handshake->sni_key_cert; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1113 | } else |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1114 | #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1115 | key_cert_list = ssl->conf->key_cert; |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1116 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1117 | if (key_cert_list == NULL) { |
| 1118 | MBEDTLS_SSL_DEBUG_MSG(3, ("server has no certificate")); |
| 1119 | return -1; |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1120 | } |
| 1121 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1122 | for (; *sig_alg != MBEDTLS_TLS1_3_SIG_NONE; sig_alg++) { |
| 1123 | if (!mbedtls_ssl_sig_alg_is_offered(ssl, *sig_alg)) { |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1124 | continue; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1125 | } |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1126 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1127 | if (!mbedtls_ssl_tls13_sig_alg_for_cert_verify_is_supported(*sig_alg)) { |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1128 | continue; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1129 | } |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1130 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1131 | for (key_cert = key_cert_list; key_cert != NULL; |
| 1132 | key_cert = key_cert->next) { |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1133 | #if defined(MBEDTLS_USE_PSA_CRYPTO) |
| 1134 | psa_algorithm_t psa_alg = PSA_ALG_NONE; |
| 1135 | #endif /* MBEDTLS_USE_PSA_CRYPTO */ |
| 1136 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1137 | MBEDTLS_SSL_DEBUG_CRT(3, "certificate (chain) candidate", |
| 1138 | key_cert->cert); |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1139 | |
| 1140 | /* |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1141 | * This avoids sending the client a cert it'll reject based on |
| 1142 | * keyUsage or other extensions. |
| 1143 | */ |
| 1144 | if (mbedtls_x509_crt_check_key_usage( |
| 1145 | key_cert->cert, MBEDTLS_X509_KU_DIGITAL_SIGNATURE) != 0 || |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1146 | mbedtls_x509_crt_check_extended_key_usage( |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1147 | key_cert->cert, MBEDTLS_OID_SERVER_AUTH, |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1148 | MBEDTLS_OID_SIZE(MBEDTLS_OID_SERVER_AUTH)) != 0) { |
| 1149 | MBEDTLS_SSL_DEBUG_MSG(3, ("certificate mismatch: " |
| 1150 | "(extended) key usage extension")); |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1151 | continue; |
| 1152 | } |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1153 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1154 | MBEDTLS_SSL_DEBUG_MSG(3, |
| 1155 | ("ssl_tls13_pick_key_cert:" |
| 1156 | "check signature algorithm %s [%04x]", |
| 1157 | mbedtls_ssl_sig_alg_to_str(*sig_alg), |
| 1158 | *sig_alg)); |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1159 | #if defined(MBEDTLS_USE_PSA_CRYPTO) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1160 | psa_alg = ssl_tls13_iana_sig_alg_to_psa_alg(*sig_alg); |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1161 | #endif /* MBEDTLS_USE_PSA_CRYPTO */ |
| 1162 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1163 | if (mbedtls_ssl_tls13_check_sig_alg_cert_key_match( |
| 1164 | *sig_alg, &key_cert->cert->pk) |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1165 | #if defined(MBEDTLS_USE_PSA_CRYPTO) |
| 1166 | && psa_alg != PSA_ALG_NONE && |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1167 | mbedtls_pk_can_do_ext(&key_cert->cert->pk, psa_alg, |
| 1168 | PSA_KEY_USAGE_SIGN_HASH) == 1 |
Ronald Cron | 67ea254 | 2022-09-15 17:34:42 +0200 | [diff] [blame] | 1169 | #endif /* MBEDTLS_USE_PSA_CRYPTO */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1170 | ) { |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1171 | ssl->handshake->key_cert = key_cert; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1172 | MBEDTLS_SSL_DEBUG_MSG(3, |
| 1173 | ("ssl_tls13_pick_key_cert:" |
| 1174 | "selected signature algorithm" |
| 1175 | " %s [%04x]", |
| 1176 | mbedtls_ssl_sig_alg_to_str(*sig_alg), |
| 1177 | *sig_alg)); |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1178 | MBEDTLS_SSL_DEBUG_CRT( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1179 | 3, "selected certificate (chain)", |
| 1180 | ssl->handshake->key_cert->cert); |
| 1181 | return 0; |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1182 | } |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1183 | } |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1184 | } |
| 1185 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1186 | MBEDTLS_SSL_DEBUG_MSG(2, ("ssl_tls13_pick_key_cert:" |
| 1187 | "no suitable certificate found")); |
| 1188 | return -1; |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1189 | } |
XiaokangQian | 81802f4 | 2022-06-10 13:25:22 +0000 | [diff] [blame] | 1190 | #endif /* MBEDTLS_X509_CRT_PARSE_C && |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 1191 | MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED */ |
XiaokangQian | 23c5be6 | 2022-06-07 02:04:34 +0000 | [diff] [blame] | 1192 | |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1193 | /* |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1194 | * |
| 1195 | * STATE HANDLING: ClientHello |
| 1196 | * |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1197 | * There are three possible classes of outcomes when parsing the ClientHello: |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1198 | * |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1199 | * 1) The ClientHello was well-formed and matched the server's configuration. |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1200 | * |
| 1201 | * In this case, the server progresses to sending its ServerHello. |
| 1202 | * |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1203 | * 2) The ClientHello was well-formed but didn't match the server's |
| 1204 | * configuration. |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1205 | * |
| 1206 | * For example, the client might not have offered a key share which |
| 1207 | * the server supports, or the server might require a cookie. |
| 1208 | * |
| 1209 | * In this case, the server sends a HelloRetryRequest. |
| 1210 | * |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1211 | * 3) The ClientHello was ill-formed |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1212 | * |
| 1213 | * In this case, we abort the handshake. |
| 1214 | * |
| 1215 | */ |
| 1216 | |
| 1217 | /* |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1218 | * Structure of this message: |
| 1219 | * |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1220 | * uint16 ProtocolVersion; |
| 1221 | * opaque Random[32]; |
| 1222 | * uint8 CipherSuite[2]; // Cryptographic suite selector |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1223 | * |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1224 | * struct { |
| 1225 | * ProtocolVersion legacy_version = 0x0303; // TLS v1.2 |
| 1226 | * Random random; |
| 1227 | * opaque legacy_session_id<0..32>; |
| 1228 | * CipherSuite cipher_suites<2..2^16-2>; |
| 1229 | * opaque legacy_compression_methods<1..2^8-1>; |
| 1230 | * Extension extensions<8..2^16-1>; |
| 1231 | * } ClientHello; |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1232 | */ |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1233 | |
| 1234 | #define SSL_CLIENT_HELLO_OK 0 |
| 1235 | #define SSL_CLIENT_HELLO_HRR_REQUIRED 1 |
| 1236 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1237 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1238 | static int ssl_tls13_parse_client_hello(mbedtls_ssl_context *ssl, |
| 1239 | const unsigned char *buf, |
| 1240 | const unsigned char *end) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1241 | { |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1242 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 1243 | const unsigned char *p = buf; |
Ronald Cron | d540d99 | 2023-03-07 09:41:48 +0100 | [diff] [blame] | 1244 | const unsigned char *random; |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1245 | size_t legacy_session_id_len; |
Ronald Cron | cada410 | 2023-03-07 09:51:39 +0100 | [diff] [blame] | 1246 | const unsigned char *legacy_session_id; |
XiaokangQian | 318dc76 | 2022-04-20 09:43:51 +0000 | [diff] [blame] | 1247 | size_t cipher_suites_len; |
Ronald Cron | 2f16b4e | 2023-03-07 10:07:32 +0100 | [diff] [blame^] | 1248 | const unsigned char *cipher_suites; |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 1249 | const unsigned char *cipher_suites_end; |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1250 | size_t extensions_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1251 | const unsigned char *extensions_end; |
Jerry Yu | c4bf5d6 | 2022-10-29 09:08:47 +0800 | [diff] [blame] | 1252 | mbedtls_ssl_handshake_params *handshake = ssl->handshake; |
Jerry Yu | 49ca928 | 2022-05-05 11:05:22 +0800 | [diff] [blame] | 1253 | int hrr_required = 0; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1254 | |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1255 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 1256 | const unsigned char *pre_shared_key_ext = NULL; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1257 | const unsigned char *pre_shared_key_ext_end = NULL; |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1258 | #endif |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1259 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1260 | /* |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1261 | * ClientHello layout: |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1262 | * 0 . 1 protocol version |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1263 | * 2 . 33 random bytes |
XiaokangQian | c5763b5 | 2022-04-02 03:34:37 +0000 | [diff] [blame] | 1264 | * 34 . 34 session id length ( 1 byte ) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1265 | * 35 . 34+x session id |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1266 | * .. . .. ciphersuite list length ( 2 bytes ) |
| 1267 | * .. . .. ciphersuite list |
| 1268 | * .. . .. compression alg. list length ( 1 byte ) |
| 1269 | * .. . .. compression alg. list |
| 1270 | * .. . .. extensions length ( 2 bytes, optional ) |
| 1271 | * .. . .. extensions ( optional ) |
| 1272 | */ |
| 1273 | |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1274 | /* |
bootstrap-prime | 6dbbf44 | 2022-05-17 19:30:44 -0400 | [diff] [blame] | 1275 | * Minimal length ( with everything empty and extensions omitted ) is |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1276 | * 2 + 32 + 1 + 2 + 1 = 38 bytes. Check that first, so that we can |
| 1277 | * read at least up to session id length without worrying. |
| 1278 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1279 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, 38); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1280 | |
| 1281 | /* ... |
| 1282 | * ProtocolVersion legacy_version = 0x0303; // TLS 1.2 |
| 1283 | * ... |
| 1284 | * with ProtocolVersion defined as: |
| 1285 | * uint16 ProtocolVersion; |
| 1286 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1287 | if (mbedtls_ssl_read_version(p, ssl->conf->transport) != |
| 1288 | MBEDTLS_SSL_VERSION_TLS1_2) { |
| 1289 | MBEDTLS_SSL_DEBUG_MSG(1, ("Unsupported version of TLS.")); |
| 1290 | MBEDTLS_SSL_PEND_FATAL_ALERT(MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION, |
| 1291 | MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION); |
| 1292 | return MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1293 | } |
| 1294 | p += 2; |
| 1295 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1296 | /* ... |
| 1297 | * Random random; |
| 1298 | * ... |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1299 | * with Random defined as: |
| 1300 | * opaque Random[32]; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1301 | */ |
Ronald Cron | d540d99 | 2023-03-07 09:41:48 +0100 | [diff] [blame] | 1302 | random = p; |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 1303 | p += MBEDTLS_CLIENT_HELLO_RANDOM_LEN; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1304 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1305 | /* ... |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1306 | * opaque legacy_session_id<0..32>; |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1307 | * ... |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1308 | */ |
Ronald Cron | cada410 | 2023-03-07 09:51:39 +0100 | [diff] [blame] | 1309 | legacy_session_id_len = *(p++); |
| 1310 | legacy_session_id = p; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1311 | |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1312 | /* |
| 1313 | * Check we have enough data for the legacy session identifier |
Jerry Yu | e95c8af | 2022-07-26 15:48:20 +0800 | [diff] [blame] | 1314 | * and the ciphersuite list length. |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1315 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1316 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, legacy_session_id_len + 2); |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1317 | p += legacy_session_id_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1318 | |
Ronald Cron | 2f16b4e | 2023-03-07 10:07:32 +0100 | [diff] [blame^] | 1319 | /* ... |
| 1320 | * CipherSuite cipher_suites<2..2^16-2>; |
| 1321 | * ... |
| 1322 | * with CipherSuite defined as: |
| 1323 | * uint8 CipherSuite[2]; |
| 1324 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1325 | cipher_suites_len = MBEDTLS_GET_UINT16_BE(p, 0); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1326 | p += 2; |
Ronald Cron | 2f16b4e | 2023-03-07 10:07:32 +0100 | [diff] [blame^] | 1327 | cipher_suites = p; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1328 | |
Ronald Cron | fc7ae87 | 2023-02-16 15:32:19 +0100 | [diff] [blame] | 1329 | /* |
| 1330 | * The length of the ciphersuite list has to be even. |
| 1331 | */ |
| 1332 | if (cipher_suites_len & 1) { |
| 1333 | MBEDTLS_SSL_PEND_FATAL_ALERT(MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR, |
| 1334 | MBEDTLS_ERR_SSL_DECODE_ERROR); |
| 1335 | return MBEDTLS_ERR_SSL_DECODE_ERROR; |
| 1336 | } |
| 1337 | |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1338 | /* Check we have enough data for the ciphersuite list, the legacy |
| 1339 | * compression methods and the length of the extensions. |
Jerry Yu | e95c8af | 2022-07-26 15:48:20 +0800 | [diff] [blame] | 1340 | * |
| 1341 | * cipher_suites cipher_suites_len bytes |
| 1342 | * legacy_compression_methods 2 bytes |
| 1343 | * extensions_len 2 bytes |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1344 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1345 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, cipher_suites_len + 2 + 2); |
XiaokangQian | 060d867 | 2022-04-21 09:24:56 +0000 | [diff] [blame] | 1346 | cipher_suites_end = p + cipher_suites_len; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1347 | |
| 1348 | /* |
Ronald Cron | 6458239 | 2023-03-07 09:21:40 +0100 | [diff] [blame] | 1349 | * Only support TLS 1.3 currently, temporarily set the version. |
| 1350 | */ |
| 1351 | ssl->tls_version = MBEDTLS_SSL_VERSION_TLS1_3; |
| 1352 | |
| 1353 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
| 1354 | /* Store minor version for later use with ticket serialization. */ |
| 1355 | ssl->session_negotiate->tls_version = MBEDTLS_SSL_VERSION_TLS1_3; |
| 1356 | ssl->session_negotiate->endpoint = ssl->conf->endpoint; |
| 1357 | #endif |
| 1358 | |
| 1359 | /* |
Ronald Cron | d540d99 | 2023-03-07 09:41:48 +0100 | [diff] [blame] | 1360 | * We are negotiation the version 1.3 of the protocol. Do what we have |
Ronald Cron | cada410 | 2023-03-07 09:51:39 +0100 | [diff] [blame] | 1361 | * postponed: copy of the client random bytes, copy of the legacy session |
Ronald Cron | 2f16b4e | 2023-03-07 10:07:32 +0100 | [diff] [blame^] | 1362 | * identifier and selection of the TLS 1.3 cipher suite. |
Ronald Cron | d540d99 | 2023-03-07 09:41:48 +0100 | [diff] [blame] | 1363 | */ |
| 1364 | MBEDTLS_SSL_DEBUG_BUF(3, "client hello, random bytes", |
| 1365 | random, MBEDTLS_CLIENT_HELLO_RANDOM_LEN); |
| 1366 | memcpy(&handshake->randbytes[0], random, MBEDTLS_CLIENT_HELLO_RANDOM_LEN); |
| 1367 | |
Ronald Cron | cada410 | 2023-03-07 09:51:39 +0100 | [diff] [blame] | 1368 | if (legacy_session_id_len > sizeof(ssl->session_negotiate->id)) { |
| 1369 | MBEDTLS_SSL_DEBUG_MSG(1, ("bad client hello message")); |
| 1370 | return MBEDTLS_ERR_SSL_DECODE_ERROR; |
| 1371 | } |
| 1372 | ssl->session_negotiate->id_len = legacy_session_id_len; |
| 1373 | MBEDTLS_SSL_DEBUG_BUF(3, "client hello, session id", |
| 1374 | legacy_session_id, legacy_session_id_len); |
| 1375 | memcpy(&ssl->session_negotiate->id[0], |
| 1376 | legacy_session_id, legacy_session_id_len); |
| 1377 | |
Ronald Cron | d540d99 | 2023-03-07 09:41:48 +0100 | [diff] [blame] | 1378 | /* |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1379 | * Search for a matching ciphersuite |
| 1380 | */ |
Ronald Cron | 2f16b4e | 2023-03-07 10:07:32 +0100 | [diff] [blame^] | 1381 | MBEDTLS_SSL_DEBUG_BUF(3, "client hello, list of cipher suites", |
| 1382 | cipher_suites, cipher_suites_len); |
| 1383 | for (p = cipher_suites; p < cipher_suites_end; p += 2) { |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1384 | uint16_t cipher_suite; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1385 | const mbedtls_ssl_ciphersuite_t *ciphersuite_info; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1386 | |
Ronald Cron | d89360b | 2023-02-21 08:53:33 +0100 | [diff] [blame] | 1387 | /* |
| 1388 | * "cipher_suite_end - p is even" is an invariant of the loop. As |
| 1389 | * cipher_suites_end - p > 0, we have cipher_suites_end - p >= 2 and |
| 1390 | * it is thus safe to read two bytes. |
| 1391 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1392 | cipher_suite = MBEDTLS_GET_UINT16_BE(p, 0); |
Jerry Yu | c5a23a0 | 2022-08-25 10:51:44 +0800 | [diff] [blame] | 1393 | ciphersuite_info = ssl_tls13_validate_peer_ciphersuite( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1394 | ssl, cipher_suite); |
| 1395 | if (ciphersuite_info == NULL) { |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1396 | continue; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1397 | } |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1398 | |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1399 | ssl->session_negotiate->ciphersuite = cipher_suite; |
Jerry Yu | c4bf5d6 | 2022-10-29 09:08:47 +0800 | [diff] [blame] | 1400 | handshake->ciphersuite_info = ciphersuite_info; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1401 | MBEDTLS_SSL_DEBUG_MSG(2, ("selected ciphersuite: %04x - %s", |
| 1402 | cipher_suite, |
| 1403 | ciphersuite_info->name)); |
Ronald Cron | 25e9ec6 | 2023-02-16 15:35:16 +0100 | [diff] [blame] | 1404 | break; |
XiaokangQian | 17f974c | 2022-04-19 09:57:41 +0000 | [diff] [blame] | 1405 | } |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1406 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1407 | if (handshake->ciphersuite_info == NULL) { |
| 1408 | MBEDTLS_SSL_PEND_FATAL_ALERT(MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE, |
| 1409 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE); |
| 1410 | return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE; |
Jerry Yu | 5725f1c | 2022-08-21 17:27:16 +0800 | [diff] [blame] | 1411 | } |
Ronald Cron | 25e9ec6 | 2023-02-16 15:35:16 +0100 | [diff] [blame] | 1412 | p = cipher_suites_end; |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1413 | |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1414 | /* ... |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1415 | * opaque legacy_compression_methods<1..2^8-1>; |
XiaokangQian | 4080a7f | 2022-04-11 09:55:18 +0000 | [diff] [blame] | 1416 | * ... |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1417 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1418 | if (p[0] != 1 || p[1] != MBEDTLS_SSL_COMPRESS_NULL) { |
| 1419 | MBEDTLS_SSL_DEBUG_MSG(1, ("bad legacy compression method")); |
| 1420 | MBEDTLS_SSL_PEND_FATAL_ALERT(MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER, |
| 1421 | MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER); |
| 1422 | return MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1423 | } |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1424 | p += 2; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1425 | |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1426 | /* ... |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1427 | * Extension extensions<8..2^16-1>; |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1428 | * ... |
XiaokangQian | b67384d | 2022-04-19 00:02:38 +0000 | [diff] [blame] | 1429 | * with Extension defined as: |
| 1430 | * struct { |
| 1431 | * ExtensionType extension_type; |
| 1432 | * opaque extension_data<0..2^16-1>; |
| 1433 | * } Extension; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1434 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1435 | extensions_len = MBEDTLS_GET_UINT16_BE(p, 0); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1436 | p += 2; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1437 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, extensions_len); |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 1438 | extensions_end = p + extensions_len; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1439 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1440 | MBEDTLS_SSL_DEBUG_BUF(3, "client hello extensions", p, extensions_len); |
Jerry Yu | 63a459c | 2022-10-31 13:38:40 +0800 | [diff] [blame] | 1441 | handshake->received_extensions = MBEDTLS_SSL_EXT_MASK_NONE; |
Jerry Yu | 0c354a2 | 2022-08-29 15:25:36 +0800 | [diff] [blame] | 1442 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1443 | while (p < extensions_end) { |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1444 | unsigned int extension_type; |
| 1445 | size_t extension_data_len; |
| 1446 | const unsigned char *extension_data_end; |
| 1447 | |
Jerry Yu | 0c354a2 | 2022-08-29 15:25:36 +0800 | [diff] [blame] | 1448 | /* RFC 8446, section 4.2.11 |
Jerry Yu | 1c9247c | 2022-07-21 12:37:39 +0800 | [diff] [blame] | 1449 | * |
| 1450 | * The "pre_shared_key" extension MUST be the last extension in the |
| 1451 | * ClientHello (this facilitates implementation as described below). |
| 1452 | * Servers MUST check that it is the last extension and otherwise fail |
| 1453 | * the handshake with an "illegal_parameter" alert. |
| 1454 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1455 | if (handshake->received_extensions & MBEDTLS_SSL_EXT_MASK(PRE_SHARED_KEY)) { |
Jerry Yu | 1c9247c | 2022-07-21 12:37:39 +0800 | [diff] [blame] | 1456 | MBEDTLS_SSL_DEBUG_MSG( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1457 | 3, ("pre_shared_key is not last extension.")); |
Jerry Yu | 1c9247c | 2022-07-21 12:37:39 +0800 | [diff] [blame] | 1458 | MBEDTLS_SSL_PEND_FATAL_ALERT( |
| 1459 | MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER, |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1460 | MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER); |
| 1461 | return MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER; |
Jerry Yu | 1c9247c | 2022-07-21 12:37:39 +0800 | [diff] [blame] | 1462 | } |
| 1463 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1464 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p, extensions_end, 4); |
| 1465 | extension_type = MBEDTLS_GET_UINT16_BE(p, 0); |
| 1466 | extension_data_len = MBEDTLS_GET_UINT16_BE(p, 2); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1467 | p += 4; |
| 1468 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1469 | MBEDTLS_SSL_CHK_BUF_READ_PTR(p, extensions_end, extension_data_len); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1470 | extension_data_end = p + extension_data_len; |
| 1471 | |
Jerry Yu | c4bf5d6 | 2022-10-29 09:08:47 +0800 | [diff] [blame] | 1472 | ret = mbedtls_ssl_tls13_check_received_extension( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1473 | ssl, MBEDTLS_SSL_HS_CLIENT_HELLO, extension_type, |
| 1474 | MBEDTLS_SSL_TLS1_3_ALLOWED_EXTS_OF_CH); |
| 1475 | if (ret != 0) { |
| 1476 | return ret; |
| 1477 | } |
Jerry Yu | e18dc7e | 2022-08-04 16:29:22 +0800 | [diff] [blame] | 1478 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1479 | switch (extension_type) { |
XiaokangQian | 40a3523 | 2022-05-07 09:02:40 +0000 | [diff] [blame] | 1480 | #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
| 1481 | case MBEDTLS_TLS_EXT_SERVERNAME: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1482 | MBEDTLS_SSL_DEBUG_MSG(3, ("found ServerName extension")); |
| 1483 | ret = mbedtls_ssl_parse_server_name_ext(ssl, p, |
| 1484 | extension_data_end); |
| 1485 | if (ret != 0) { |
XiaokangQian | 40a3523 | 2022-05-07 09:02:40 +0000 | [diff] [blame] | 1486 | MBEDTLS_SSL_DEBUG_RET( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1487 | 1, "mbedtls_ssl_parse_servername_ext", ret); |
| 1488 | return ret; |
XiaokangQian | 40a3523 | 2022-05-07 09:02:40 +0000 | [diff] [blame] | 1489 | } |
XiaokangQian | 40a3523 | 2022-05-07 09:02:40 +0000 | [diff] [blame] | 1490 | break; |
| 1491 | #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ |
| 1492 | |
Valerio Setti | 080a22b | 2023-03-20 15:22:47 +0100 | [diff] [blame] | 1493 | #if defined(PSA_WANT_ALG_ECDH) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1494 | case MBEDTLS_TLS_EXT_SUPPORTED_GROUPS: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1495 | MBEDTLS_SSL_DEBUG_MSG(3, ("found supported group extension")); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1496 | |
| 1497 | /* Supported Groups Extension |
| 1498 | * |
| 1499 | * When sent by the client, the "supported_groups" extension |
| 1500 | * indicates the named groups which the client supports, |
| 1501 | * ordered from most preferred to least preferred. |
| 1502 | */ |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1503 | ret = ssl_tls13_parse_supported_groups_ext( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1504 | ssl, p, extension_data_end); |
| 1505 | if (ret != 0) { |
| 1506 | MBEDTLS_SSL_DEBUG_RET(1, |
| 1507 | "mbedtls_ssl_parse_supported_groups_ext", ret); |
| 1508 | return ret; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1509 | } |
| 1510 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1511 | break; |
Valerio Setti | 080a22b | 2023-03-20 15:22:47 +0100 | [diff] [blame] | 1512 | #endif /* PSA_WANT_ALG_ECDH */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1513 | |
Valerio Setti | 080a22b | 2023-03-20 15:22:47 +0100 | [diff] [blame] | 1514 | #if defined(PSA_WANT_ALG_ECDH) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1515 | case MBEDTLS_TLS_EXT_KEY_SHARE: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1516 | MBEDTLS_SSL_DEBUG_MSG(3, ("found key share extension")); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1517 | |
| 1518 | /* |
| 1519 | * Key Share Extension |
| 1520 | * |
| 1521 | * When sent by the client, the "key_share" extension |
| 1522 | * contains the endpoint's cryptographic parameters for |
| 1523 | * ECDHE/DHE key establishment methods. |
| 1524 | */ |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1525 | ret = ssl_tls13_parse_key_shares_ext( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1526 | ssl, p, extension_data_end); |
| 1527 | if (ret == SSL_TLS1_3_PARSE_KEY_SHARES_EXT_NO_MATCH) { |
| 1528 | MBEDTLS_SSL_DEBUG_MSG(2, ("HRR needed ")); |
Jerry Yu | 49ca928 | 2022-05-05 11:05:22 +0800 | [diff] [blame] | 1529 | hrr_required = 1; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1530 | } |
| 1531 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1532 | if (ret < 0) { |
Jerry Yu | 582dd06 | 2022-04-22 21:59:01 +0800 | [diff] [blame] | 1533 | MBEDTLS_SSL_DEBUG_RET( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1534 | 1, "ssl_tls13_parse_key_shares_ext", ret); |
| 1535 | return ret; |
Jerry Yu | 582dd06 | 2022-04-22 21:59:01 +0800 | [diff] [blame] | 1536 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1537 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1538 | break; |
Valerio Setti | 080a22b | 2023-03-20 15:22:47 +0100 | [diff] [blame] | 1539 | #endif /* PSA_WANT_ALG_ECDH */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1540 | |
| 1541 | case MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1542 | MBEDTLS_SSL_DEBUG_MSG(3, ("found supported versions extension")); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1543 | |
| 1544 | ret = ssl_tls13_parse_supported_versions_ext( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1545 | ssl, p, extension_data_end); |
| 1546 | if (ret != 0) { |
| 1547 | MBEDTLS_SSL_DEBUG_RET(1, |
| 1548 | ("ssl_tls13_parse_supported_versions_ext"), ret); |
| 1549 | return ret; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1550 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1551 | break; |
| 1552 | |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1553 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 1554 | case MBEDTLS_TLS_EXT_PSK_KEY_EXCHANGE_MODES: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1555 | MBEDTLS_SSL_DEBUG_MSG(3, ("found psk key exchange modes extension")); |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 1556 | |
| 1557 | ret = ssl_tls13_parse_key_exchange_modes_ext( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1558 | ssl, p, extension_data_end); |
| 1559 | if (ret != 0) { |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 1560 | MBEDTLS_SSL_DEBUG_RET( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1561 | 1, "ssl_tls13_parse_key_exchange_modes_ext", ret); |
| 1562 | return ret; |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 1563 | } |
| 1564 | |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 1565 | break; |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1566 | #endif |
Jerry Yu | e19e3b9 | 2022-07-08 12:04:51 +0000 | [diff] [blame] | 1567 | |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1568 | case MBEDTLS_TLS_EXT_PRE_SHARED_KEY: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1569 | MBEDTLS_SSL_DEBUG_MSG(3, ("found pre_shared_key extension")); |
| 1570 | if ((handshake->received_extensions & |
| 1571 | MBEDTLS_SSL_EXT_MASK(PSK_KEY_EXCHANGE_MODES)) == 0) { |
Jerry Yu | 13ab81d | 2022-07-22 23:17:11 +0800 | [diff] [blame] | 1572 | MBEDTLS_SSL_PEND_FATAL_ALERT( |
| 1573 | MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER, |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1574 | MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER); |
| 1575 | return MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER; |
Jerry Yu | 13ab81d | 2022-07-22 23:17:11 +0800 | [diff] [blame] | 1576 | } |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1577 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1578 | /* Delay processing of the PSK identity once we have |
| 1579 | * found out which algorithms to use. We keep a pointer |
| 1580 | * to the buffer and the size for later processing. |
| 1581 | */ |
Jerry Yu | 29d9faa | 2022-08-23 17:52:45 +0800 | [diff] [blame] | 1582 | pre_shared_key_ext = p; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1583 | pre_shared_key_ext_end = extension_data_end; |
Jerry Yu | e18dc7e | 2022-08-04 16:29:22 +0800 | [diff] [blame] | 1584 | #endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED */ |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1585 | break; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1586 | |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 1587 | #if defined(MBEDTLS_SSL_ALPN) |
| 1588 | case MBEDTLS_TLS_EXT_ALPN: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1589 | MBEDTLS_SSL_DEBUG_MSG(3, ("found alpn extension")); |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 1590 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1591 | ret = mbedtls_ssl_parse_alpn_ext(ssl, p, extension_data_end); |
| 1592 | if (ret != 0) { |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 1593 | MBEDTLS_SSL_DEBUG_RET( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1594 | 1, ("mbedtls_ssl_parse_alpn_ext"), ret); |
| 1595 | return ret; |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 1596 | } |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 1597 | break; |
| 1598 | #endif /* MBEDTLS_SSL_ALPN */ |
| 1599 | |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 1600 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1601 | case MBEDTLS_TLS_EXT_SIG_ALG: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1602 | MBEDTLS_SSL_DEBUG_MSG(3, ("found signature_algorithms extension")); |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1603 | |
Gabor Mezei | 078e803 | 2022-04-27 21:17:56 +0200 | [diff] [blame] | 1604 | ret = mbedtls_ssl_parse_sig_alg_ext( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1605 | ssl, p, extension_data_end); |
| 1606 | if (ret != 0) { |
| 1607 | MBEDTLS_SSL_DEBUG_MSG(1, |
| 1608 | ( |
| 1609 | "ssl_parse_supported_signature_algorithms_server_ext ( %d )", |
| 1610 | ret)); |
| 1611 | return ret; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1612 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1613 | break; |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 1614 | #endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1615 | |
Jan Bruckner | 151f642 | 2023-02-10 12:45:19 +0100 | [diff] [blame] | 1616 | #if defined(MBEDTLS_SSL_RECORD_SIZE_LIMIT) |
| 1617 | case MBEDTLS_TLS_EXT_RECORD_SIZE_LIMIT: |
| 1618 | MBEDTLS_SSL_DEBUG_MSG(3, ("found record_size_limit extension")); |
| 1619 | |
| 1620 | ret = mbedtls_ssl_tls13_parse_record_size_limit_ext(ssl, p, extension_data_end); |
| 1621 | |
Jan Bruckner | 1a38e54 | 2023-03-15 14:15:11 +0100 | [diff] [blame] | 1622 | /* TODO: Return unconditionally here until we handle the record size limit correctly. |
| 1623 | * Once handled correctly, only return in case of errors. */ |
Jan Bruckner | 151f642 | 2023-02-10 12:45:19 +0100 | [diff] [blame] | 1624 | return ret; |
| 1625 | |
| 1626 | break; |
| 1627 | #endif /* MBEDTLS_SSL_RECORD_SIZE_LIMIT */ |
| 1628 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1629 | default: |
Jerry Yu | 79aa721 | 2022-11-08 21:30:21 +0800 | [diff] [blame] | 1630 | MBEDTLS_SSL_PRINT_EXT( |
Jerry Yu | 63a459c | 2022-10-31 13:38:40 +0800 | [diff] [blame] | 1631 | 3, MBEDTLS_SSL_HS_CLIENT_HELLO, |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1632 | extension_type, "( ignored )"); |
Jerry Yu | 0c354a2 | 2022-08-29 15:25:36 +0800 | [diff] [blame] | 1633 | break; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1634 | } |
| 1635 | |
| 1636 | p += extension_data_len; |
| 1637 | } |
| 1638 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1639 | MBEDTLS_SSL_PRINT_EXTS(3, MBEDTLS_SSL_HS_CLIENT_HELLO, |
| 1640 | handshake->received_extensions); |
Jerry Yu | e18dc7e | 2022-08-04 16:29:22 +0800 | [diff] [blame] | 1641 | |
Manuel Pégourié-Gonnard | b8b07aa | 2023-02-06 00:34:21 +0100 | [diff] [blame] | 1642 | ret = mbedtls_ssl_add_hs_hdr_to_checksum(ssl, |
| 1643 | MBEDTLS_SSL_HS_CLIENT_HELLO, |
| 1644 | p - buf); |
| 1645 | if (0 != ret) { |
| 1646 | MBEDTLS_SSL_DEBUG_RET(1, ("mbedtls_ssl_add_hs_hdr_to_checksum"), ret); |
| 1647 | return ret; |
| 1648 | } |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 1649 | |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1650 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1651 | /* Update checksum with either |
| 1652 | * - The entire content of the CH message, if no PSK extension is present |
| 1653 | * - The content up to but excluding the PSK extension, if present. |
| 1654 | */ |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1655 | /* If we've settled on a PSK-based exchange, parse PSK identity ext */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1656 | if (mbedtls_ssl_tls13_some_psk_enabled(ssl) && |
| 1657 | mbedtls_ssl_conf_tls13_some_psk_enabled(ssl) && |
| 1658 | (handshake->received_extensions & MBEDTLS_SSL_EXT_MASK(PRE_SHARED_KEY))) { |
Manuel Pégourié-Gonnard | b8b07aa | 2023-02-06 00:34:21 +0100 | [diff] [blame] | 1659 | ret = handshake->update_checksum(ssl, buf, |
| 1660 | pre_shared_key_ext - buf); |
| 1661 | if (0 != ret) { |
| 1662 | MBEDTLS_SSL_DEBUG_RET(1, ("update_checksum"), ret); |
| 1663 | return ret; |
| 1664 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1665 | ret = ssl_tls13_parse_pre_shared_key_ext(ssl, |
| 1666 | pre_shared_key_ext, |
| 1667 | pre_shared_key_ext_end, |
| 1668 | cipher_suites, |
| 1669 | cipher_suites_end); |
| 1670 | if (ret == MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY) { |
| 1671 | handshake->received_extensions &= ~MBEDTLS_SSL_EXT_MASK(PRE_SHARED_KEY); |
| 1672 | } else if (ret != 0) { |
Jerry Yu | 63a459c | 2022-10-31 13:38:40 +0800 | [diff] [blame] | 1673 | MBEDTLS_SSL_DEBUG_RET( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1674 | 1, "ssl_tls13_parse_pre_shared_key_ext", ret); |
| 1675 | return ret; |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1676 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1677 | } else |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 1678 | #endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED */ |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1679 | { |
Manuel Pégourié-Gonnard | b8b07aa | 2023-02-06 00:34:21 +0100 | [diff] [blame] | 1680 | ret = handshake->update_checksum(ssl, buf, p - buf); |
| 1681 | if (0 != ret) { |
| 1682 | MBEDTLS_SSL_DEBUG_RET(1, ("update_checksum"), ret); |
| 1683 | return ret; |
| 1684 | } |
Jerry Yu | 1c10556 | 2022-07-10 06:32:38 +0000 | [diff] [blame] | 1685 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1686 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1687 | ret = ssl_tls13_determine_key_exchange_mode(ssl); |
| 1688 | if (ret < 0) { |
| 1689 | return ret; |
| 1690 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1691 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1692 | mbedtls_ssl_optimize_checksum(ssl, handshake->ciphersuite_info); |
Jerry Yu | e5834fd | 2022-08-29 20:16:09 +0800 | [diff] [blame] | 1693 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1694 | return hrr_required ? SSL_CLIENT_HELLO_HRR_REQUIRED : SSL_CLIENT_HELLO_OK; |
XiaokangQian | 75fe8c7 | 2022-06-15 09:42:45 +0000 | [diff] [blame] | 1695 | } |
| 1696 | |
| 1697 | /* Update the handshake state machine */ |
| 1698 | |
Ronald Cron | ce7d76e | 2022-07-08 18:56:49 +0200 | [diff] [blame] | 1699 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1700 | static int ssl_tls13_postprocess_client_hello(mbedtls_ssl_context *ssl) |
XiaokangQian | 75fe8c7 | 2022-06-15 09:42:45 +0000 | [diff] [blame] | 1701 | { |
| 1702 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 1703 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1704 | /* |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1705 | * Server certificate selection |
| 1706 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1707 | if (ssl->conf->f_cert_cb && (ret = ssl->conf->f_cert_cb(ssl)) != 0) { |
| 1708 | MBEDTLS_SSL_DEBUG_RET(1, "f_cert_cb", ret); |
| 1709 | return ret; |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 1710 | } |
| 1711 | #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
| 1712 | ssl->handshake->sni_name = NULL; |
| 1713 | ssl->handshake->sni_name_len = 0; |
| 1714 | #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1715 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1716 | ret = mbedtls_ssl_tls13_key_schedule_stage_early(ssl); |
| 1717 | if (ret != 0) { |
| 1718 | MBEDTLS_SSL_DEBUG_RET(1, |
| 1719 | "mbedtls_ssl_tls1_3_key_schedule_stage_early", ret); |
| 1720 | return ret; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1721 | } |
| 1722 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1723 | return 0; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 1724 | |
| 1725 | } |
| 1726 | |
| 1727 | /* |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1728 | * Main entry point from the state machine; orchestrates the otherfunctions. |
| 1729 | */ |
| 1730 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1731 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1732 | static int ssl_tls13_process_client_hello(mbedtls_ssl_context *ssl) |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1733 | { |
| 1734 | |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 1735 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1736 | unsigned char *buf = NULL; |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1737 | size_t buflen = 0; |
Jerry Yu | 4ca9140 | 2022-05-09 15:50:57 +0800 | [diff] [blame] | 1738 | int parse_client_hello_ret; |
| 1739 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1740 | MBEDTLS_SSL_DEBUG_MSG(2, ("=> parse client hello")); |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1741 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1742 | MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_tls13_fetch_handshake_msg( |
| 1743 | ssl, MBEDTLS_SSL_HS_CLIENT_HELLO, |
| 1744 | &buf, &buflen)); |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1745 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1746 | MBEDTLS_SSL_PROC_CHK_NEG(ssl_tls13_parse_client_hello(ssl, buf, |
| 1747 | buf + buflen)); |
Jerry Yu | f41553b | 2022-05-09 22:20:30 +0800 | [diff] [blame] | 1748 | parse_client_hello_ret = ret; /* Store return value of parse_client_hello, |
| 1749 | * only SSL_CLIENT_HELLO_OK or |
| 1750 | * SSL_CLIENT_HELLO_HRR_REQUIRED at this |
| 1751 | * stage as negative error codes are handled |
| 1752 | * by MBEDTLS_SSL_PROC_CHK_NEG. */ |
Jerry Yu | 4ca9140 | 2022-05-09 15:50:57 +0800 | [diff] [blame] | 1753 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1754 | MBEDTLS_SSL_PROC_CHK(ssl_tls13_postprocess_client_hello(ssl)); |
Jerry Yu | 582dd06 | 2022-04-22 21:59:01 +0800 | [diff] [blame] | 1755 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1756 | if (parse_client_hello_ret == SSL_CLIENT_HELLO_OK) { |
| 1757 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_SERVER_HELLO); |
| 1758 | } else { |
| 1759 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_HELLO_RETRY_REQUEST); |
| 1760 | } |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1761 | |
| 1762 | cleanup: |
| 1763 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1764 | MBEDTLS_SSL_DEBUG_MSG(2, ("<= parse client hello")); |
| 1765 | return ret; |
XiaokangQian | ed582dd | 2022-04-13 08:21:05 +0000 | [diff] [blame] | 1766 | } |
| 1767 | |
| 1768 | /* |
Jerry Yu | 1c3e688 | 2022-04-20 21:23:40 +0800 | [diff] [blame] | 1769 | * Handler for MBEDTLS_SSL_SERVER_HELLO |
Jerry Yu | 5b64ae9 | 2022-03-30 17:15:02 +0800 | [diff] [blame] | 1770 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1771 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1772 | static int ssl_tls13_prepare_server_hello(mbedtls_ssl_context *ssl) |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1773 | { |
Jerry Yu | 637a3f1 | 2022-04-20 21:37:58 +0800 | [diff] [blame] | 1774 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 1775 | unsigned char *server_randbytes = |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1776 | ssl->handshake->randbytes + MBEDTLS_CLIENT_HELLO_RANDOM_LEN; |
| 1777 | if (ssl->conf->f_rng == NULL) { |
| 1778 | MBEDTLS_SSL_DEBUG_MSG(1, ("no RNG provided")); |
| 1779 | return MBEDTLS_ERR_SSL_NO_RNG; |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1780 | } |
| 1781 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1782 | if ((ret = ssl->conf->f_rng(ssl->conf->p_rng, server_randbytes, |
| 1783 | MBEDTLS_SERVER_HELLO_RANDOM_LEN)) != 0) { |
| 1784 | MBEDTLS_SSL_DEBUG_RET(1, "f_rng", ret); |
| 1785 | return ret; |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1786 | } |
| 1787 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1788 | MBEDTLS_SSL_DEBUG_BUF(3, "server hello, random bytes", server_randbytes, |
| 1789 | MBEDTLS_SERVER_HELLO_RANDOM_LEN); |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1790 | |
| 1791 | #if defined(MBEDTLS_HAVE_TIME) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1792 | ssl->session_negotiate->start = time(NULL); |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1793 | #endif /* MBEDTLS_HAVE_TIME */ |
| 1794 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1795 | return ret; |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 1796 | } |
| 1797 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1798 | /* |
Jerry Yu | e74e04a | 2022-04-21 09:23:16 +0800 | [diff] [blame] | 1799 | * ssl_tls13_write_server_hello_supported_versions_ext (): |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1800 | * |
| 1801 | * struct { |
Jerry Yu | fb9f54d | 2022-04-06 10:08:34 +0800 | [diff] [blame] | 1802 | * ProtocolVersion selected_version; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1803 | * } SupportedVersions; |
| 1804 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1805 | MBEDTLS_CHECK_RETURN_CRITICAL |
Jerry Yu | e74e04a | 2022-04-21 09:23:16 +0800 | [diff] [blame] | 1806 | static int ssl_tls13_write_server_hello_supported_versions_ext( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1807 | mbedtls_ssl_context *ssl, |
| 1808 | unsigned char *buf, |
| 1809 | unsigned char *end, |
| 1810 | size_t *out_len) |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1811 | { |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1812 | *out_len = 0; |
| 1813 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1814 | MBEDTLS_SSL_DEBUG_MSG(3, ("server hello, write selected version")); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1815 | |
| 1816 | /* Check if we have space to write the extension: |
| 1817 | * - extension_type (2 bytes) |
| 1818 | * - extension_data_length (2 bytes) |
Jerry Yu | 349a613 | 2022-04-14 20:52:56 +0800 | [diff] [blame] | 1819 | * - selected_version (2 bytes) |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1820 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1821 | MBEDTLS_SSL_CHK_BUF_PTR(buf, end, 6); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1822 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1823 | MBEDTLS_PUT_UINT16_BE(MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS, buf, 0); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1824 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1825 | MBEDTLS_PUT_UINT16_BE(2, buf, 2); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1826 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1827 | mbedtls_ssl_write_version(buf + 4, |
| 1828 | ssl->conf->transport, |
| 1829 | ssl->tls_version); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1830 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1831 | MBEDTLS_SSL_DEBUG_MSG(3, ("supported version: [%04x]", |
| 1832 | ssl->tls_version)); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1833 | |
Jerry Yu | 349a613 | 2022-04-14 20:52:56 +0800 | [diff] [blame] | 1834 | *out_len = 6; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1835 | |
Jerry Yu | b95dd36 | 2022-11-08 21:19:34 +0800 | [diff] [blame] | 1836 | mbedtls_ssl_tls13_set_hs_sent_ext_mask( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1837 | ssl, MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS); |
Jerry Yu | b95dd36 | 2022-11-08 21:19:34 +0800 | [diff] [blame] | 1838 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1839 | return 0; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1840 | } |
| 1841 | |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 1842 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1843 | |
| 1844 | /* Generate and export a single key share. For hybrid KEMs, this can |
| 1845 | * be called multiple times with the different components of the hybrid. */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1846 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1847 | static int ssl_tls13_generate_and_write_key_share(mbedtls_ssl_context *ssl, |
| 1848 | uint16_t named_group, |
| 1849 | unsigned char *buf, |
| 1850 | unsigned char *end, |
| 1851 | size_t *out_len) |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1852 | { |
| 1853 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1854 | |
| 1855 | *out_len = 0; |
| 1856 | |
Valerio Setti | 080a22b | 2023-03-20 15:22:47 +0100 | [diff] [blame] | 1857 | #if defined(PSA_WANT_ALG_ECDH) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1858 | if (mbedtls_ssl_tls13_named_group_is_ecdhe(named_group)) { |
Jerry Yu | 89e103c | 2022-03-30 22:43:29 +0800 | [diff] [blame] | 1859 | ret = mbedtls_ssl_tls13_generate_and_write_ecdh_key_exchange( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1860 | ssl, named_group, buf, end, out_len); |
| 1861 | if (ret != 0) { |
Jerry Yu | 89e103c | 2022-03-30 22:43:29 +0800 | [diff] [blame] | 1862 | MBEDTLS_SSL_DEBUG_RET( |
| 1863 | 1, "mbedtls_ssl_tls13_generate_and_write_ecdh_key_exchange", |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1864 | ret); |
| 1865 | return ret; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1866 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1867 | } else |
Valerio Setti | 080a22b | 2023-03-20 15:22:47 +0100 | [diff] [blame] | 1868 | #endif /* PSA_WANT_ALG_ECDH */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1869 | if (0 /* Other kinds of KEMs */) { |
| 1870 | } else { |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1871 | ((void) ssl); |
| 1872 | ((void) named_group); |
| 1873 | ((void) buf); |
| 1874 | ((void) end); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1875 | ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; |
| 1876 | } |
| 1877 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1878 | return ret; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1879 | } |
| 1880 | |
| 1881 | /* |
| 1882 | * ssl_tls13_write_key_share_ext |
| 1883 | * |
| 1884 | * Structure of key_share extension in ServerHello: |
| 1885 | * |
Jerry Yu | 1c3e688 | 2022-04-20 21:23:40 +0800 | [diff] [blame] | 1886 | * struct { |
| 1887 | * NamedGroup group; |
| 1888 | * opaque key_exchange<1..2^16-1>; |
| 1889 | * } KeyShareEntry; |
| 1890 | * struct { |
| 1891 | * KeyShareEntry server_share; |
| 1892 | * } KeyShareServerHello; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1893 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1894 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1895 | static int ssl_tls13_write_key_share_ext(mbedtls_ssl_context *ssl, |
| 1896 | unsigned char *buf, |
| 1897 | unsigned char *end, |
| 1898 | size_t *out_len) |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1899 | { |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1900 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1901 | unsigned char *p = buf; |
Jerry Yu | 57d4841 | 2022-04-20 21:50:42 +0800 | [diff] [blame] | 1902 | uint16_t group = ssl->handshake->offered_group_id; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1903 | unsigned char *server_share = buf + 4; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1904 | size_t key_exchange_length; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1905 | |
| 1906 | *out_len = 0; |
| 1907 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1908 | MBEDTLS_SSL_DEBUG_MSG(3, ("server hello, adding key share extension")); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1909 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1910 | MBEDTLS_SSL_DEBUG_MSG(2, ("server hello, write selected_group: %s (%04x)", |
| 1911 | mbedtls_ssl_named_group_to_str(group), |
| 1912 | group)); |
Jerry Yu | 58af233 | 2022-09-06 11:19:31 +0800 | [diff] [blame] | 1913 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1914 | /* Check if we have space for header and length fields: |
| 1915 | * - extension_type (2 bytes) |
| 1916 | * - extension_data_length (2 bytes) |
| 1917 | * - group (2 bytes) |
| 1918 | * - key_exchange_length (2 bytes) |
| 1919 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1920 | MBEDTLS_SSL_CHK_BUF_PTR(p, end, 8); |
| 1921 | MBEDTLS_PUT_UINT16_BE(MBEDTLS_TLS_EXT_KEY_SHARE, p, 0); |
| 1922 | MBEDTLS_PUT_UINT16_BE(group, server_share, 0); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1923 | p += 8; |
Jerry Yu | 57d4841 | 2022-04-20 21:50:42 +0800 | [diff] [blame] | 1924 | |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1925 | /* When we introduce PQC-ECDHE hybrids, we'll want to call this |
| 1926 | * function multiple times. */ |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1927 | ret = ssl_tls13_generate_and_write_key_share( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1928 | ssl, group, server_share + 4, end, &key_exchange_length); |
| 1929 | if (ret != 0) { |
| 1930 | return ret; |
| 1931 | } |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1932 | p += key_exchange_length; |
Jerry Yu | c1be19f | 2022-04-23 16:11:39 +0800 | [diff] [blame] | 1933 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1934 | MBEDTLS_PUT_UINT16_BE(key_exchange_length, server_share + 2, 0); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1935 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1936 | MBEDTLS_PUT_UINT16_BE(p - server_share, buf, 2); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1937 | |
Jerry Yu | 57d4841 | 2022-04-20 21:50:42 +0800 | [diff] [blame] | 1938 | *out_len = p - buf; |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 1939 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1940 | mbedtls_ssl_tls13_set_hs_sent_ext_mask(ssl, MBEDTLS_TLS_EXT_KEY_SHARE); |
Jerry Yu | b95dd36 | 2022-11-08 21:19:34 +0800 | [diff] [blame] | 1941 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1942 | return 0; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 1943 | } |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 1944 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 1945 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1946 | static int ssl_tls13_write_hrr_key_share_ext(mbedtls_ssl_context *ssl, |
| 1947 | unsigned char *buf, |
| 1948 | unsigned char *end, |
| 1949 | size_t *out_len) |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1950 | { |
| 1951 | uint16_t selected_group = ssl->handshake->hrr_selected_group; |
| 1952 | /* key_share Extension |
| 1953 | * |
| 1954 | * struct { |
| 1955 | * select (Handshake.msg_type) { |
| 1956 | * ... |
| 1957 | * case hello_retry_request: |
| 1958 | * NamedGroup selected_group; |
| 1959 | * ... |
| 1960 | * }; |
| 1961 | * } KeyShare; |
| 1962 | */ |
| 1963 | |
| 1964 | *out_len = 0; |
| 1965 | |
Jerry Yu | b0ac10b | 2022-05-05 11:10:08 +0800 | [diff] [blame] | 1966 | /* |
| 1967 | * For a pure PSK key exchange, there is no group to agree upon. The purpose |
| 1968 | * of the HRR is then to transmit a cookie to force the client to demonstrate |
| 1969 | * reachability at their apparent network address (primarily useful for DTLS). |
| 1970 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1971 | if (!mbedtls_ssl_tls13_key_exchange_mode_with_ephemeral(ssl)) { |
| 1972 | return 0; |
| 1973 | } |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1974 | |
| 1975 | /* We should only send the key_share extension if the client's initial |
| 1976 | * key share was not acceptable. */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1977 | if (ssl->handshake->offered_group_id != 0) { |
| 1978 | MBEDTLS_SSL_DEBUG_MSG(4, ("Skip key_share extension in HRR")); |
| 1979 | return 0; |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1980 | } |
| 1981 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1982 | if (selected_group == 0) { |
| 1983 | MBEDTLS_SSL_DEBUG_MSG(1, ("no matching named group found")); |
| 1984 | return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE; |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1985 | } |
| 1986 | |
Jerry Yu | b0ac10b | 2022-05-05 11:10:08 +0800 | [diff] [blame] | 1987 | /* Check if we have enough space: |
| 1988 | * - extension_type (2 bytes) |
| 1989 | * - extension_data_length (2 bytes) |
| 1990 | * - selected_group (2 bytes) |
| 1991 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1992 | MBEDTLS_SSL_CHK_BUF_PTR(buf, end, 6); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1993 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1994 | MBEDTLS_PUT_UINT16_BE(MBEDTLS_TLS_EXT_KEY_SHARE, buf, 0); |
| 1995 | MBEDTLS_PUT_UINT16_BE(2, buf, 2); |
| 1996 | MBEDTLS_PUT_UINT16_BE(selected_group, buf, 4); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 1997 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 1998 | MBEDTLS_SSL_DEBUG_MSG(3, |
| 1999 | ("HRR selected_group: %s (%x)", |
| 2000 | mbedtls_ssl_named_group_to_str(selected_group), |
| 2001 | selected_group)); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 2002 | |
| 2003 | *out_len = 6; |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 2004 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2005 | mbedtls_ssl_tls13_set_hs_sent_ext_mask(ssl, MBEDTLS_TLS_EXT_KEY_SHARE); |
Jerry Yu | b95dd36 | 2022-11-08 21:19:34 +0800 | [diff] [blame] | 2006 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2007 | return 0; |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 2008 | } |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2009 | |
| 2010 | /* |
| 2011 | * Structure of ServerHello message: |
| 2012 | * |
| 2013 | * struct { |
| 2014 | * ProtocolVersion legacy_version = 0x0303; // TLS v1.2 |
| 2015 | * Random random; |
| 2016 | * opaque legacy_session_id_echo<0..32>; |
| 2017 | * CipherSuite cipher_suite; |
| 2018 | * uint8 legacy_compression_method = 0; |
| 2019 | * Extension extensions<6..2^16-1>; |
| 2020 | * } ServerHello; |
| 2021 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2022 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2023 | static int ssl_tls13_write_server_hello_body(mbedtls_ssl_context *ssl, |
| 2024 | unsigned char *buf, |
| 2025 | unsigned char *end, |
| 2026 | size_t *out_len, |
| 2027 | int is_hrr) |
Jerry Yu | 56404d7 | 2022-03-30 17:36:13 +0800 | [diff] [blame] | 2028 | { |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 2029 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2030 | unsigned char *p = buf; |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 2031 | unsigned char *p_extensions_len; |
Jerry Yu | fbe3e64 | 2022-04-25 19:31:51 +0800 | [diff] [blame] | 2032 | size_t output_len; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2033 | |
| 2034 | *out_len = 0; |
Jerry Yu | 50e00e3 | 2022-10-31 14:45:01 +0800 | [diff] [blame] | 2035 | ssl->handshake->sent_extensions = MBEDTLS_SSL_EXT_MASK_NONE; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2036 | |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 2037 | /* ... |
| 2038 | * ProtocolVersion legacy_version = 0x0303; // TLS 1.2 |
| 2039 | * ... |
| 2040 | * with ProtocolVersion defined as: |
| 2041 | * uint16 ProtocolVersion; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2042 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2043 | MBEDTLS_SSL_CHK_BUF_PTR(p, end, 2); |
| 2044 | MBEDTLS_PUT_UINT16_BE(0x0303, p, 0); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2045 | p += 2; |
| 2046 | |
Jerry Yu | 1c3e688 | 2022-04-20 21:23:40 +0800 | [diff] [blame] | 2047 | /* ... |
| 2048 | * Random random; |
| 2049 | * ... |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 2050 | * with Random defined as: |
| 2051 | * opaque Random[MBEDTLS_SERVER_HELLO_RANDOM_LEN]; |
Jerry Yu | 1c3e688 | 2022-04-20 21:23:40 +0800 | [diff] [blame] | 2052 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2053 | MBEDTLS_SSL_CHK_BUF_PTR(p, end, MBEDTLS_SERVER_HELLO_RANDOM_LEN); |
| 2054 | if (is_hrr) { |
| 2055 | memcpy(p, mbedtls_ssl_tls13_hello_retry_request_magic, |
| 2056 | MBEDTLS_SERVER_HELLO_RANDOM_LEN); |
| 2057 | } else { |
| 2058 | memcpy(p, &ssl->handshake->randbytes[MBEDTLS_CLIENT_HELLO_RANDOM_LEN], |
| 2059 | MBEDTLS_SERVER_HELLO_RANDOM_LEN); |
Jerry Yu | 23f7a6f | 2022-04-23 15:16:45 +0800 | [diff] [blame] | 2060 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2061 | MBEDTLS_SSL_DEBUG_BUF(3, "server hello, random bytes", |
| 2062 | p, MBEDTLS_SERVER_HELLO_RANDOM_LEN); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2063 | p += MBEDTLS_SERVER_HELLO_RANDOM_LEN; |
| 2064 | |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 2065 | /* ... |
| 2066 | * opaque legacy_session_id_echo<0..32>; |
| 2067 | * ... |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2068 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2069 | MBEDTLS_SSL_CHK_BUF_PTR(p, end, 1 + ssl->session_negotiate->id_len); |
| 2070 | *p++ = (unsigned char) ssl->session_negotiate->id_len; |
| 2071 | if (ssl->session_negotiate->id_len > 0) { |
| 2072 | memcpy(p, &ssl->session_negotiate->id[0], |
| 2073 | ssl->session_negotiate->id_len); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2074 | p += ssl->session_negotiate->id_len; |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 2075 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2076 | MBEDTLS_SSL_DEBUG_BUF(3, "session id", ssl->session_negotiate->id, |
| 2077 | ssl->session_negotiate->id_len); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2078 | } |
| 2079 | |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 2080 | /* ... |
| 2081 | * CipherSuite cipher_suite; |
| 2082 | * ... |
| 2083 | * with CipherSuite defined as: |
| 2084 | * uint8 CipherSuite[2]; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2085 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2086 | MBEDTLS_SSL_CHK_BUF_PTR(p, end, 2); |
| 2087 | MBEDTLS_PUT_UINT16_BE(ssl->session_negotiate->ciphersuite, p, 0); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2088 | p += 2; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2089 | MBEDTLS_SSL_DEBUG_MSG(3, |
| 2090 | ("server hello, chosen ciphersuite: %s ( id=%d )", |
| 2091 | mbedtls_ssl_get_ciphersuite_name( |
| 2092 | ssl->session_negotiate->ciphersuite), |
| 2093 | ssl->session_negotiate->ciphersuite)); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2094 | |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 2095 | /* ... |
| 2096 | * uint8 legacy_compression_method = 0; |
| 2097 | * ... |
| 2098 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2099 | MBEDTLS_SSL_CHK_BUF_PTR(p, end, 1); |
Thomas Daubney | 31e03a8 | 2022-07-25 15:59:25 +0100 | [diff] [blame] | 2100 | *p++ = MBEDTLS_SSL_COMPRESS_NULL; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2101 | |
Jerry Yu | cfc04b3 | 2022-04-21 09:31:58 +0800 | [diff] [blame] | 2102 | /* ... |
| 2103 | * Extension extensions<6..2^16-1>; |
| 2104 | * ... |
| 2105 | * struct { |
| 2106 | * ExtensionType extension_type; (2 bytes) |
| 2107 | * opaque extension_data<0..2^16-1>; |
| 2108 | * } Extension; |
| 2109 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2110 | MBEDTLS_SSL_CHK_BUF_PTR(p, end, 2); |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 2111 | p_extensions_len = p; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2112 | p += 2; |
| 2113 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2114 | if ((ret = ssl_tls13_write_server_hello_supported_versions_ext( |
| 2115 | ssl, p, end, &output_len)) != 0) { |
Jerry Yu | 955ddd7 | 2022-04-22 22:27:33 +0800 | [diff] [blame] | 2116 | MBEDTLS_SSL_DEBUG_RET( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2117 | 1, "ssl_tls13_write_server_hello_supported_versions_ext", ret); |
| 2118 | return ret; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2119 | } |
| 2120 | p += output_len; |
| 2121 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2122 | if (mbedtls_ssl_tls13_key_exchange_mode_with_ephemeral(ssl)) { |
| 2123 | if (is_hrr) { |
| 2124 | ret = ssl_tls13_write_hrr_key_share_ext(ssl, p, end, &output_len); |
| 2125 | } else { |
| 2126 | ret = ssl_tls13_write_key_share_ext(ssl, p, end, &output_len); |
| 2127 | } |
| 2128 | if (ret != 0) { |
| 2129 | return ret; |
| 2130 | } |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2131 | p += output_len; |
| 2132 | } |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2133 | |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 2134 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2135 | if (!is_hrr && mbedtls_ssl_tls13_key_exchange_mode_with_psk(ssl)) { |
| 2136 | ret = ssl_tls13_write_server_pre_shared_key_ext(ssl, p, end, &output_len); |
| 2137 | if (ret != 0) { |
| 2138 | MBEDTLS_SSL_DEBUG_RET(1, "ssl_tls13_write_server_pre_shared_key_ext", |
| 2139 | ret); |
| 2140 | return ret; |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 2141 | } |
| 2142 | p += output_len; |
| 2143 | } |
Ronald Cron | 41a443a | 2022-10-04 16:38:25 +0200 | [diff] [blame] | 2144 | #endif |
Jerry Yu | 032b15ce | 2022-07-11 06:10:03 +0000 | [diff] [blame] | 2145 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2146 | 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] | 2147 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2148 | MBEDTLS_SSL_DEBUG_BUF(4, "server hello extensions", |
| 2149 | p_extensions_len, p - p_extensions_len); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2150 | |
Jerry Yu | d9436a1 | 2022-04-20 22:28:09 +0800 | [diff] [blame] | 2151 | *out_len = p - buf; |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2152 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2153 | MBEDTLS_SSL_DEBUG_BUF(3, "server hello", buf, *out_len); |
Jerry Yu | 3bf2c64 | 2022-03-30 22:02:12 +0800 | [diff] [blame] | 2154 | |
Jerry Yu | 7de2ff0 | 2022-11-08 21:43:46 +0800 | [diff] [blame] | 2155 | MBEDTLS_SSL_PRINT_EXTS( |
Jerry Yu | 4b8f2f7 | 2022-10-31 13:31:22 +0800 | [diff] [blame] | 2156 | 3, is_hrr ? MBEDTLS_SSL_TLS1_3_HS_HELLO_RETRY_REQUEST : |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2157 | MBEDTLS_SSL_HS_SERVER_HELLO, |
| 2158 | ssl->handshake->sent_extensions); |
Jerry Yu | 4b8f2f7 | 2022-10-31 13:31:22 +0800 | [diff] [blame] | 2159 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2160 | return ret; |
Jerry Yu | 56404d7 | 2022-03-30 17:36:13 +0800 | [diff] [blame] | 2161 | } |
| 2162 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2163 | MBEDTLS_CHECK_RETURN_CRITICAL |
Xiaokang Qian | 934ce6f | 2023-02-06 10:23:04 +0000 | [diff] [blame] | 2164 | static int ssl_tls13_finalize_server_hello(mbedtls_ssl_context *ssl) |
Jerry Yu | e110d25 | 2022-05-05 10:19:22 +0800 | [diff] [blame] | 2165 | { |
| 2166 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2167 | ret = mbedtls_ssl_tls13_compute_handshake_transform(ssl); |
| 2168 | if (ret != 0) { |
| 2169 | MBEDTLS_SSL_DEBUG_RET(1, |
| 2170 | "mbedtls_ssl_tls13_compute_handshake_transform", |
| 2171 | ret); |
| 2172 | return ret; |
Jerry Yu | e110d25 | 2022-05-05 10:19:22 +0800 | [diff] [blame] | 2173 | } |
| 2174 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2175 | return ret; |
Jerry Yu | e110d25 | 2022-05-05 10:19:22 +0800 | [diff] [blame] | 2176 | } |
| 2177 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2178 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2179 | static int ssl_tls13_write_server_hello(mbedtls_ssl_context *ssl) |
Jerry Yu | 5b64ae9 | 2022-03-30 17:15:02 +0800 | [diff] [blame] | 2180 | { |
Jerry Yu | 637a3f1 | 2022-04-20 21:37:58 +0800 | [diff] [blame] | 2181 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 2182 | unsigned char *buf; |
| 2183 | size_t buf_len, msg_len; |
| 2184 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2185 | MBEDTLS_SSL_DEBUG_MSG(2, ("=> write server hello")); |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 2186 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2187 | MBEDTLS_SSL_PROC_CHK(ssl_tls13_prepare_server_hello(ssl)); |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 2188 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2189 | MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_start_handshake_msg(ssl, |
| 2190 | MBEDTLS_SSL_HS_SERVER_HELLO, &buf, |
| 2191 | &buf_len)); |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 2192 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2193 | MBEDTLS_SSL_PROC_CHK(ssl_tls13_write_server_hello_body(ssl, buf, |
| 2194 | buf + buf_len, |
| 2195 | &msg_len, |
| 2196 | 0)); |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 2197 | |
Manuel Pégourié-Gonnard | b8b07aa | 2023-02-06 00:34:21 +0100 | [diff] [blame] | 2198 | MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_add_hs_msg_to_checksum( |
Manuel Pégourié-Gonnard | 43cc127 | 2023-02-06 11:48:19 +0100 | [diff] [blame] | 2199 | ssl, MBEDTLS_SSL_HS_SERVER_HELLO, buf, msg_len)); |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 2200 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2201 | MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_finish_handshake_msg( |
| 2202 | ssl, buf_len, msg_len)); |
Jerry Yu | 637a3f1 | 2022-04-20 21:37:58 +0800 | [diff] [blame] | 2203 | |
Xiaokang Qian | 934ce6f | 2023-02-06 10:23:04 +0000 | [diff] [blame] | 2204 | MBEDTLS_SSL_PROC_CHK(ssl_tls13_finalize_server_hello(ssl)); |
Jerry Yu | e110d25 | 2022-05-05 10:19:22 +0800 | [diff] [blame] | 2205 | |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 2206 | #if defined(MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE) |
| 2207 | /* The server sends a dummy change_cipher_spec record immediately |
| 2208 | * after its first handshake message. This may either be after |
| 2209 | * a ServerHello or a HelloRetryRequest. |
| 2210 | */ |
Gabor Mezei | 96ae926 | 2022-06-28 11:45:18 +0200 | [diff] [blame] | 2211 | mbedtls_ssl_handshake_set_state( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2212 | ssl, MBEDTLS_SSL_SERVER_CCS_AFTER_SERVER_HELLO); |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 2213 | #else |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2214 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_ENCRYPTED_EXTENSIONS); |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 2215 | #endif /* MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE */ |
Jerry Yu | e110d25 | 2022-05-05 10:19:22 +0800 | [diff] [blame] | 2216 | |
Jerry Yu | f4b27e4 | 2022-03-30 17:32:21 +0800 | [diff] [blame] | 2217 | cleanup: |
| 2218 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2219 | MBEDTLS_SSL_DEBUG_MSG(2, ("<= write server hello")); |
| 2220 | return ret; |
Jerry Yu | 5b64ae9 | 2022-03-30 17:15:02 +0800 | [diff] [blame] | 2221 | } |
| 2222 | |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2223 | |
| 2224 | /* |
| 2225 | * Handler for MBEDTLS_SSL_HELLO_RETRY_REQUEST |
| 2226 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2227 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2228 | static int ssl_tls13_prepare_hello_retry_request(mbedtls_ssl_context *ssl) |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2229 | { |
| 2230 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2231 | if (ssl->handshake->hello_retry_request_count > 0) { |
| 2232 | MBEDTLS_SSL_DEBUG_MSG(1, ("Too many HRRs")); |
| 2233 | MBEDTLS_SSL_PEND_FATAL_ALERT(MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE, |
| 2234 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE); |
| 2235 | return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE; |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2236 | } |
| 2237 | |
| 2238 | /* |
| 2239 | * Create stateless transcript hash for HRR |
| 2240 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2241 | MBEDTLS_SSL_DEBUG_MSG(4, ("Reset transcript for HRR")); |
| 2242 | ret = mbedtls_ssl_reset_transcript_for_hrr(ssl); |
| 2243 | if (ret != 0) { |
| 2244 | MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_reset_transcript_for_hrr", ret); |
| 2245 | return ret; |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2246 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2247 | mbedtls_ssl_session_reset_msg_layer(ssl, 0); |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2248 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2249 | return 0; |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2250 | } |
| 2251 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2252 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2253 | static int ssl_tls13_write_hello_retry_request(mbedtls_ssl_context *ssl) |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2254 | { |
| 2255 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2256 | unsigned char *buf; |
| 2257 | size_t buf_len, msg_len; |
| 2258 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2259 | MBEDTLS_SSL_DEBUG_MSG(2, ("=> write hello retry request")); |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2260 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2261 | MBEDTLS_SSL_PROC_CHK(ssl_tls13_prepare_hello_retry_request(ssl)); |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2262 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2263 | MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_start_handshake_msg( |
| 2264 | ssl, MBEDTLS_SSL_HS_SERVER_HELLO, |
| 2265 | &buf, &buf_len)); |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2266 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2267 | MBEDTLS_SSL_PROC_CHK(ssl_tls13_write_server_hello_body(ssl, buf, |
| 2268 | buf + buf_len, |
| 2269 | &msg_len, |
| 2270 | 1)); |
Manuel Pégourié-Gonnard | b8b07aa | 2023-02-06 00:34:21 +0100 | [diff] [blame] | 2271 | MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_add_hs_msg_to_checksum( |
Manuel Pégourié-Gonnard | 43cc127 | 2023-02-06 11:48:19 +0100 | [diff] [blame] | 2272 | ssl, MBEDTLS_SSL_HS_SERVER_HELLO, buf, msg_len)); |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2273 | |
| 2274 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2275 | MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_finish_handshake_msg(ssl, buf_len, |
| 2276 | msg_len)); |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2277 | |
| 2278 | ssl->handshake->hello_retry_request_count++; |
| 2279 | |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 2280 | #if defined(MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE) |
| 2281 | /* The server sends a dummy change_cipher_spec record immediately |
| 2282 | * after its first handshake message. This may either be after |
| 2283 | * a ServerHello or a HelloRetryRequest. |
| 2284 | */ |
Gabor Mezei | 96ae926 | 2022-06-28 11:45:18 +0200 | [diff] [blame] | 2285 | mbedtls_ssl_handshake_set_state( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2286 | ssl, MBEDTLS_SSL_SERVER_CCS_AFTER_HELLO_RETRY_REQUEST); |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 2287 | #else |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2288 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_CLIENT_HELLO); |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 2289 | #endif /* MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE */ |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2290 | |
| 2291 | cleanup: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2292 | MBEDTLS_SSL_DEBUG_MSG(2, ("<= write hello retry request")); |
| 2293 | return ret; |
Jerry Yu | 23d1a25 | 2022-05-12 18:08:59 +0800 | [diff] [blame] | 2294 | } |
| 2295 | |
Jerry Yu | 5b64ae9 | 2022-03-30 17:15:02 +0800 | [diff] [blame] | 2296 | /* |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2297 | * Handler for MBEDTLS_SSL_ENCRYPTED_EXTENSIONS |
| 2298 | */ |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2299 | |
| 2300 | /* |
| 2301 | * struct { |
| 2302 | * Extension extensions<0..2 ^ 16 - 1>; |
| 2303 | * } EncryptedExtensions; |
| 2304 | * |
| 2305 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2306 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2307 | static int ssl_tls13_write_encrypted_extensions_body(mbedtls_ssl_context *ssl, |
| 2308 | unsigned char *buf, |
| 2309 | unsigned char *end, |
| 2310 | size_t *out_len) |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2311 | { |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 2312 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2313 | unsigned char *p = buf; |
| 2314 | size_t extensions_len = 0; |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2315 | unsigned char *p_extensions_len; |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 2316 | size_t output_len; |
Jerry Yu | 9da5e5a | 2022-05-03 15:46:09 +0800 | [diff] [blame] | 2317 | |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2318 | *out_len = 0; |
| 2319 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2320 | MBEDTLS_SSL_CHK_BUF_PTR(p, end, 2); |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2321 | p_extensions_len = p; |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2322 | p += 2; |
| 2323 | |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2324 | ((void) ssl); |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 2325 | ((void) ret); |
| 2326 | ((void) output_len); |
| 2327 | |
| 2328 | #if defined(MBEDTLS_SSL_ALPN) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2329 | ret = mbedtls_ssl_write_alpn_ext(ssl, p, end, &output_len); |
| 2330 | if (ret != 0) { |
| 2331 | return ret; |
| 2332 | } |
XiaokangQian | 95d5f54 | 2022-06-24 02:29:26 +0000 | [diff] [blame] | 2333 | p += output_len; |
XiaokangQian | acb3992 | 2022-06-17 10:18:48 +0000 | [diff] [blame] | 2334 | #endif /* MBEDTLS_SSL_ALPN */ |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2335 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2336 | extensions_len = (p - p_extensions_len) - 2; |
| 2337 | MBEDTLS_PUT_UINT16_BE(extensions_len, p_extensions_len, 0); |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2338 | |
| 2339 | *out_len = p - buf; |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2340 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2341 | MBEDTLS_SSL_DEBUG_BUF(4, "encrypted extensions", buf, *out_len); |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2342 | |
Jerry Yu | 7de2ff0 | 2022-11-08 21:43:46 +0800 | [diff] [blame] | 2343 | MBEDTLS_SSL_PRINT_EXTS( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2344 | 3, MBEDTLS_SSL_HS_ENCRYPTED_EXTENSIONS, ssl->handshake->sent_extensions); |
Jerry Yu | 4b8f2f7 | 2022-10-31 13:31:22 +0800 | [diff] [blame] | 2345 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2346 | return 0; |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2347 | } |
| 2348 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2349 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2350 | static int ssl_tls13_write_encrypted_extensions(mbedtls_ssl_context *ssl) |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2351 | { |
| 2352 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2353 | unsigned char *buf; |
Jerry Yu | 39730a7 | 2022-05-03 12:14:04 +0800 | [diff] [blame] | 2354 | size_t buf_len, msg_len; |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2355 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2356 | mbedtls_ssl_set_outbound_transform(ssl, |
| 2357 | ssl->handshake->transform_handshake); |
Gabor Mezei | 5471912 | 2022-06-28 11:34:56 +0200 | [diff] [blame] | 2358 | MBEDTLS_SSL_DEBUG_MSG( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2359 | 3, ("switching to handshake transform for outbound data")); |
Gabor Mezei | 5471912 | 2022-06-28 11:34:56 +0200 | [diff] [blame] | 2360 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2361 | MBEDTLS_SSL_DEBUG_MSG(2, ("=> write encrypted extensions")); |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2362 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2363 | MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_start_handshake_msg(ssl, |
| 2364 | MBEDTLS_SSL_HS_ENCRYPTED_EXTENSIONS, &buf, |
| 2365 | &buf_len)); |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2366 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2367 | MBEDTLS_SSL_PROC_CHK(ssl_tls13_write_encrypted_extensions_body( |
| 2368 | ssl, buf, buf + buf_len, &msg_len)); |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2369 | |
Manuel Pégourié-Gonnard | b8b07aa | 2023-02-06 00:34:21 +0100 | [diff] [blame] | 2370 | MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_add_hs_msg_to_checksum( |
Manuel Pégourié-Gonnard | 43cc127 | 2023-02-06 11:48:19 +0100 | [diff] [blame] | 2371 | ssl, MBEDTLS_SSL_HS_ENCRYPTED_EXTENSIONS, buf, msg_len)); |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2372 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2373 | MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_finish_handshake_msg( |
| 2374 | ssl, buf_len, msg_len)); |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2375 | |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 2376 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2377 | if (mbedtls_ssl_tls13_key_exchange_mode_with_psk(ssl)) { |
| 2378 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_SERVER_FINISHED); |
| 2379 | } else { |
| 2380 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_CERTIFICATE_REQUEST); |
| 2381 | } |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2382 | #else |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2383 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_SERVER_FINISHED); |
Jerry Yu | 8937eb4 | 2022-05-03 12:12:14 +0800 | [diff] [blame] | 2384 | #endif |
| 2385 | |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2386 | cleanup: |
| 2387 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2388 | MBEDTLS_SSL_DEBUG_MSG(2, ("<= write encrypted extensions")); |
| 2389 | return ret; |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2390 | } |
| 2391 | |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 2392 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED) |
XiaokangQian | a987e1d | 2022-05-07 01:25:58 +0000 | [diff] [blame] | 2393 | #define SSL_CERTIFICATE_REQUEST_SEND_REQUEST 0 |
| 2394 | #define SSL_CERTIFICATE_REQUEST_SKIP 1 |
| 2395 | /* Coordination: |
| 2396 | * Check whether a CertificateRequest message should be written. |
| 2397 | * Returns a negative code on failure, or |
| 2398 | * - SSL_CERTIFICATE_REQUEST_SEND_REQUEST |
| 2399 | * - SSL_CERTIFICATE_REQUEST_SKIP |
| 2400 | * indicating if the writing of the CertificateRequest |
| 2401 | * should be skipped or not. |
| 2402 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2403 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2404 | static int ssl_tls13_certificate_request_coordinate(mbedtls_ssl_context *ssl) |
XiaokangQian | a987e1d | 2022-05-07 01:25:58 +0000 | [diff] [blame] | 2405 | { |
| 2406 | int authmode; |
| 2407 | |
XiaokangQian | 40a3523 | 2022-05-07 09:02:40 +0000 | [diff] [blame] | 2408 | #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2409 | if (ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET) { |
XiaokangQian | 40a3523 | 2022-05-07 09:02:40 +0000 | [diff] [blame] | 2410 | authmode = ssl->handshake->sni_authmode; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2411 | } else |
XiaokangQian | 40a3523 | 2022-05-07 09:02:40 +0000 | [diff] [blame] | 2412 | #endif |
XiaokangQian | a987e1d | 2022-05-07 01:25:58 +0000 | [diff] [blame] | 2413 | authmode = ssl->conf->authmode; |
| 2414 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2415 | if (authmode == MBEDTLS_SSL_VERIFY_NONE) { |
Ronald Cron | eac00ad | 2022-09-13 10:16:31 +0200 | [diff] [blame] | 2416 | ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_SKIP_VERIFY; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2417 | return SSL_CERTIFICATE_REQUEST_SKIP; |
Ronald Cron | eac00ad | 2022-09-13 10:16:31 +0200 | [diff] [blame] | 2418 | } |
XiaokangQian | a987e1d | 2022-05-07 01:25:58 +0000 | [diff] [blame] | 2419 | |
XiaokangQian | c3017f6 | 2022-05-13 05:55:41 +0000 | [diff] [blame] | 2420 | ssl->handshake->certificate_request_sent = 1; |
XiaokangQian | 189ded2 | 2022-05-10 08:12:17 +0000 | [diff] [blame] | 2421 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2422 | return SSL_CERTIFICATE_REQUEST_SEND_REQUEST; |
XiaokangQian | a987e1d | 2022-05-07 01:25:58 +0000 | [diff] [blame] | 2423 | } |
| 2424 | |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2425 | /* |
| 2426 | * struct { |
| 2427 | * opaque certificate_request_context<0..2^8-1>; |
| 2428 | * Extension extensions<2..2^16-1>; |
| 2429 | * } CertificateRequest; |
| 2430 | * |
| 2431 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2432 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2433 | static int ssl_tls13_write_certificate_request_body(mbedtls_ssl_context *ssl, |
| 2434 | unsigned char *buf, |
| 2435 | const unsigned char *end, |
| 2436 | size_t *out_len) |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2437 | { |
| 2438 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2439 | unsigned char *p = buf; |
XiaokangQian | ec6efb9 | 2022-05-06 09:53:10 +0000 | [diff] [blame] | 2440 | size_t output_len = 0; |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2441 | unsigned char *p_extensions_len; |
| 2442 | |
| 2443 | *out_len = 0; |
| 2444 | |
| 2445 | /* Check if we have enough space: |
| 2446 | * - certificate_request_context (1 byte) |
| 2447 | * - extensions length (2 bytes) |
| 2448 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2449 | MBEDTLS_SSL_CHK_BUF_PTR(p, end, 3); |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2450 | |
| 2451 | /* |
| 2452 | * Write certificate_request_context |
| 2453 | */ |
| 2454 | /* |
| 2455 | * We use a zero length context for the normal handshake |
| 2456 | * messages. For post-authentication handshake messages |
| 2457 | * this request context would be set to a non-zero value. |
| 2458 | */ |
| 2459 | *p++ = 0x0; |
| 2460 | |
| 2461 | /* |
| 2462 | * Write extensions |
| 2463 | */ |
| 2464 | /* The extensions must contain the signature_algorithms. */ |
| 2465 | p_extensions_len = p; |
| 2466 | p += 2; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2467 | ret = mbedtls_ssl_write_sig_alg_ext(ssl, p, end, &output_len); |
| 2468 | if (ret != 0) { |
| 2469 | return ret; |
| 2470 | } |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2471 | |
XiaokangQian | ec6efb9 | 2022-05-06 09:53:10 +0000 | [diff] [blame] | 2472 | p += output_len; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2473 | MBEDTLS_PUT_UINT16_BE(p - p_extensions_len - 2, p_extensions_len, 0); |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2474 | |
| 2475 | *out_len = p - buf; |
| 2476 | |
Jerry Yu | 7de2ff0 | 2022-11-08 21:43:46 +0800 | [diff] [blame] | 2477 | MBEDTLS_SSL_PRINT_EXTS( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2478 | 3, MBEDTLS_SSL_HS_CERTIFICATE_REQUEST, ssl->handshake->sent_extensions); |
Jerry Yu | 4b8f2f7 | 2022-10-31 13:31:22 +0800 | [diff] [blame] | 2479 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2480 | return 0; |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2481 | } |
| 2482 | |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2483 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2484 | static int ssl_tls13_write_certificate_request(mbedtls_ssl_context *ssl) |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2485 | { |
| 2486 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2487 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2488 | MBEDTLS_SSL_DEBUG_MSG(2, ("=> write certificate request")); |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2489 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2490 | MBEDTLS_SSL_PROC_CHK_NEG(ssl_tls13_certificate_request_coordinate(ssl)); |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2491 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2492 | if (ret == SSL_CERTIFICATE_REQUEST_SEND_REQUEST) { |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2493 | unsigned char *buf; |
| 2494 | size_t buf_len, msg_len; |
| 2495 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2496 | MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_start_handshake_msg(ssl, |
| 2497 | MBEDTLS_SSL_HS_CERTIFICATE_REQUEST, |
| 2498 | &buf, &buf_len)); |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2499 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2500 | MBEDTLS_SSL_PROC_CHK(ssl_tls13_write_certificate_request_body( |
| 2501 | ssl, buf, buf + buf_len, &msg_len)); |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2502 | |
Manuel Pégourié-Gonnard | b8b07aa | 2023-02-06 00:34:21 +0100 | [diff] [blame] | 2503 | MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_add_hs_msg_to_checksum( |
Manuel Pégourié-Gonnard | 43cc127 | 2023-02-06 11:48:19 +0100 | [diff] [blame] | 2504 | ssl, MBEDTLS_SSL_HS_CERTIFICATE_REQUEST, buf, msg_len)); |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2505 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2506 | MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_finish_handshake_msg( |
| 2507 | ssl, buf_len, msg_len)); |
| 2508 | } else if (ret == SSL_CERTIFICATE_REQUEST_SKIP) { |
| 2509 | MBEDTLS_SSL_DEBUG_MSG(2, ("<= skip write certificate request")); |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2510 | ret = 0; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2511 | } else { |
| 2512 | MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2513 | ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; |
| 2514 | goto cleanup; |
| 2515 | } |
| 2516 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2517 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_SERVER_CERTIFICATE); |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2518 | cleanup: |
| 2519 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2520 | MBEDTLS_SSL_DEBUG_MSG(2, ("<= write certificate request")); |
| 2521 | return ret; |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2522 | } |
XiaokangQian | cec9ae6 | 2022-05-06 07:28:50 +0000 | [diff] [blame] | 2523 | |
Jerry Yu | 4d3841a | 2022-04-16 12:37:19 +0800 | [diff] [blame] | 2524 | /* |
Jerry Yu | c6e6dbf | 2022-04-16 19:42:57 +0800 | [diff] [blame] | 2525 | * Handler for MBEDTLS_SSL_SERVER_CERTIFICATE |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2526 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2527 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2528 | static int ssl_tls13_write_server_certificate(mbedtls_ssl_context *ssl) |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2529 | { |
Jerry Yu | 5a26f30 | 2022-05-10 20:46:40 +0800 | [diff] [blame] | 2530 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 2531 | |
| 2532 | #if defined(MBEDTLS_X509_CRT_PARSE_C) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2533 | if ((ssl_tls13_pick_key_cert(ssl) != 0) || |
| 2534 | mbedtls_ssl_own_cert(ssl) == NULL) { |
| 2535 | MBEDTLS_SSL_DEBUG_MSG(2, ("No certificate available.")); |
| 2536 | MBEDTLS_SSL_PEND_FATAL_ALERT(MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE, |
| 2537 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE); |
| 2538 | return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE; |
Jerry Yu | 5a26f30 | 2022-05-10 20:46:40 +0800 | [diff] [blame] | 2539 | } |
XiaokangQian | fb665a8 | 2022-06-15 03:57:21 +0000 | [diff] [blame] | 2540 | #endif /* MBEDTLS_X509_CRT_PARSE_C */ |
Jerry Yu | 5a26f30 | 2022-05-10 20:46:40 +0800 | [diff] [blame] | 2541 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2542 | ret = mbedtls_ssl_tls13_write_certificate(ssl); |
| 2543 | if (ret != 0) { |
| 2544 | return ret; |
| 2545 | } |
| 2546 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_CERTIFICATE_VERIFY); |
| 2547 | return 0; |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2548 | } |
| 2549 | |
| 2550 | /* |
Jerry Yu | c6e6dbf | 2022-04-16 19:42:57 +0800 | [diff] [blame] | 2551 | * Handler for MBEDTLS_SSL_CERTIFICATE_VERIFY |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2552 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2553 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2554 | static int ssl_tls13_write_certificate_verify(mbedtls_ssl_context *ssl) |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2555 | { |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2556 | int ret = mbedtls_ssl_tls13_write_certificate_verify(ssl); |
| 2557 | if (ret != 0) { |
| 2558 | return ret; |
| 2559 | } |
| 2560 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_SERVER_FINISHED); |
| 2561 | return 0; |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2562 | } |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 2563 | #endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED */ |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2564 | |
| 2565 | /* |
Jerry Yu | d6e253d | 2022-05-18 13:59:24 +0800 | [diff] [blame] | 2566 | * Handler for MBEDTLS_SSL_SERVER_FINISHED |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2567 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2568 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2569 | static int ssl_tls13_write_server_finished(mbedtls_ssl_context *ssl) |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2570 | { |
Jerry Yu | d6e253d | 2022-05-18 13:59:24 +0800 | [diff] [blame] | 2571 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
Jerry Yu | 27bdc7c | 2022-04-16 13:33:27 +0800 | [diff] [blame] | 2572 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2573 | ret = mbedtls_ssl_tls13_write_finished_message(ssl); |
| 2574 | if (ret != 0) { |
| 2575 | return ret; |
| 2576 | } |
Jerry Yu | 27bdc7c | 2022-04-16 13:33:27 +0800 | [diff] [blame] | 2577 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2578 | ret = mbedtls_ssl_tls13_compute_application_transform(ssl); |
| 2579 | if (ret != 0) { |
Jerry Yu | e3d67cb | 2022-05-19 15:33:10 +0800 | [diff] [blame] | 2580 | MBEDTLS_SSL_PEND_FATAL_ALERT( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2581 | MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE, |
| 2582 | MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE); |
| 2583 | return ret; |
Jerry Yu | e3d67cb | 2022-05-19 15:33:10 +0800 | [diff] [blame] | 2584 | } |
XiaokangQian | c3017f6 | 2022-05-13 05:55:41 +0000 | [diff] [blame] | 2585 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2586 | MBEDTLS_SSL_DEBUG_MSG(1, ("Switch to handshake keys for inbound traffic")); |
| 2587 | mbedtls_ssl_set_inbound_transform(ssl, ssl->handshake->transform_handshake); |
XiaokangQian | 189ded2 | 2022-05-10 08:12:17 +0000 | [diff] [blame] | 2588 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2589 | if (ssl->handshake->certificate_request_sent) { |
| 2590 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_CLIENT_CERTIFICATE); |
| 2591 | } else { |
| 2592 | MBEDTLS_SSL_DEBUG_MSG(2, ("skip parse certificate")); |
| 2593 | MBEDTLS_SSL_DEBUG_MSG(2, ("skip parse certificate verify")); |
| 2594 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_CLIENT_FINISHED); |
Ronald Cron | 1938588 | 2022-06-15 16:26:13 +0200 | [diff] [blame] | 2595 | } |
Ronald Cron | 63dc463 | 2022-05-31 14:41:53 +0200 | [diff] [blame] | 2596 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2597 | return 0; |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2598 | } |
| 2599 | |
| 2600 | /* |
Jerry Yu | d6e253d | 2022-05-18 13:59:24 +0800 | [diff] [blame] | 2601 | * Handler for MBEDTLS_SSL_CLIENT_FINISHED |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2602 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2603 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2604 | static int ssl_tls13_process_client_finished(mbedtls_ssl_context *ssl) |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2605 | { |
Jerry Yu | d6e253d | 2022-05-18 13:59:24 +0800 | [diff] [blame] | 2606 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2607 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2608 | ret = mbedtls_ssl_tls13_process_finished_message(ssl); |
| 2609 | if (ret != 0) { |
| 2610 | return ret; |
Jerry Yu | e3d67cb | 2022-05-19 15:33:10 +0800 | [diff] [blame] | 2611 | } |
| 2612 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2613 | ret = mbedtls_ssl_tls13_compute_resumption_master_secret(ssl); |
| 2614 | if (ret != 0) { |
| 2615 | MBEDTLS_SSL_DEBUG_RET(1, |
| 2616 | "mbedtls_ssl_tls13_compute_resumption_master_secret", ret); |
| 2617 | } |
| 2618 | |
| 2619 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_HANDSHAKE_WRAPUP); |
| 2620 | return 0; |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2621 | } |
| 2622 | |
| 2623 | /* |
Jerry Yu | d6e253d | 2022-05-18 13:59:24 +0800 | [diff] [blame] | 2624 | * Handler for MBEDTLS_SSL_HANDSHAKE_WRAPUP |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2625 | */ |
Manuel Pégourié-Gonnard | a3115dc | 2022-06-17 10:52:54 +0200 | [diff] [blame] | 2626 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2627 | static int ssl_tls13_handshake_wrapup(mbedtls_ssl_context *ssl) |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2628 | { |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2629 | MBEDTLS_SSL_DEBUG_MSG(2, ("handshake: done")); |
Jerry Yu | 03ed50b | 2022-04-16 17:13:30 +0800 | [diff] [blame] | 2630 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2631 | mbedtls_ssl_tls13_handshake_wrapup(ssl); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2632 | |
Pengyu Lv | 3643fdb | 2023-01-12 16:46:28 +0800 | [diff] [blame] | 2633 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) && \ |
| 2634 | defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
Pengyu Lv | a1aa31b | 2022-12-13 13:49:59 +0800 | [diff] [blame] | 2635 | /* TODO: Remove the check of SOME_PSK_ENABLED since SESSION_TICKETS requires |
| 2636 | * SOME_PSK_ENABLED to be enabled. Here is just to make CI happy. It is |
| 2637 | * expected to be resolved with issue#6395. |
| 2638 | */ |
Pengyu Lv | c7af2c4 | 2022-12-01 16:33:00 +0800 | [diff] [blame] | 2639 | /* Sent NewSessionTicket message only when client supports PSK */ |
Pengyu Lv | 3643fdb | 2023-01-12 16:46:28 +0800 | [diff] [blame] | 2640 | if (mbedtls_ssl_tls13_some_psk_enabled(ssl)) { |
| 2641 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_TLS1_3_NEW_SESSION_TICKET); |
Pengyu Lv | c7af2c4 | 2022-12-01 16:33:00 +0800 | [diff] [blame] | 2642 | } else |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2643 | #endif |
Pengyu Lv | 3643fdb | 2023-01-12 16:46:28 +0800 | [diff] [blame] | 2644 | { |
| 2645 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_HANDSHAKE_OVER); |
| 2646 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2647 | return 0; |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 2648 | } |
| 2649 | |
| 2650 | /* |
Jerry Yu | a8d3c50 | 2022-10-30 14:51:23 +0800 | [diff] [blame] | 2651 | * Handler for MBEDTLS_SSL_TLS1_3_NEW_SESSION_TICKET |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2652 | */ |
| 2653 | #define SSL_NEW_SESSION_TICKET_SKIP 0 |
| 2654 | #define SSL_NEW_SESSION_TICKET_WRITE 1 |
| 2655 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2656 | static int ssl_tls13_write_new_session_ticket_coordinate(mbedtls_ssl_context *ssl) |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2657 | { |
| 2658 | /* Check whether the use of session tickets is enabled */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2659 | if (ssl->conf->f_ticket_write == NULL) { |
| 2660 | MBEDTLS_SSL_DEBUG_MSG(2, ("NewSessionTicket: disabled," |
| 2661 | " callback is not set")); |
| 2662 | return SSL_NEW_SESSION_TICKET_SKIP; |
Jerry Yu | d0766ec | 2022-09-22 10:46:57 +0800 | [diff] [blame] | 2663 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2664 | if (ssl->conf->new_session_tickets_count == 0) { |
| 2665 | MBEDTLS_SSL_DEBUG_MSG(2, ("NewSessionTicket: disabled," |
| 2666 | " configured count is zero")); |
| 2667 | return SSL_NEW_SESSION_TICKET_SKIP; |
Jerry Yu | d0766ec | 2022-09-22 10:46:57 +0800 | [diff] [blame] | 2668 | } |
| 2669 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2670 | if (ssl->handshake->new_session_tickets_count == 0) { |
| 2671 | MBEDTLS_SSL_DEBUG_MSG(2, ("NewSessionTicket: all tickets have " |
| 2672 | "been sent.")); |
| 2673 | return SSL_NEW_SESSION_TICKET_SKIP; |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2674 | } |
| 2675 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2676 | return SSL_NEW_SESSION_TICKET_WRITE; |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2677 | } |
| 2678 | |
| 2679 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
| 2680 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2681 | static int ssl_tls13_prepare_new_session_ticket(mbedtls_ssl_context *ssl, |
| 2682 | unsigned char *ticket_nonce, |
| 2683 | size_t ticket_nonce_size) |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2684 | { |
| 2685 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2686 | mbedtls_ssl_session *session = ssl->session; |
| 2687 | mbedtls_ssl_ciphersuite_t *ciphersuite_info; |
| 2688 | psa_algorithm_t psa_hash_alg; |
| 2689 | int hash_length; |
| 2690 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2691 | MBEDTLS_SSL_DEBUG_MSG(2, ("=> prepare NewSessionTicket msg")); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2692 | |
| 2693 | #if defined(MBEDTLS_HAVE_TIME) |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2694 | session->start = mbedtls_time(NULL); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2695 | #endif |
| 2696 | |
Pengyu Lv | 9f92695 | 2022-11-17 15:22:33 +0800 | [diff] [blame] | 2697 | /* Set ticket_flags depends on the advertised psk key exchange mode */ |
Pengyu Lv | 80270b2 | 2023-01-12 11:54:04 +0800 | [diff] [blame] | 2698 | mbedtls_ssl_session_clear_ticket_flags( |
Pengyu Lv | 9eacb44 | 2022-12-09 14:39:19 +0800 | [diff] [blame] | 2699 | session, MBEDTLS_SSL_TLS1_3_TICKET_FLAGS_MASK); |
Pengyu Lv | e6487fe | 2022-12-06 09:30:29 +0800 | [diff] [blame] | 2700 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED) |
Pengyu Lv | 80270b2 | 2023-01-12 11:54:04 +0800 | [diff] [blame] | 2701 | mbedtls_ssl_session_set_ticket_flags( |
Pengyu Lv | 9eacb44 | 2022-12-09 14:39:19 +0800 | [diff] [blame] | 2702 | session, ssl->handshake->tls13_kex_modes); |
Pengyu Lv | e6487fe | 2022-12-06 09:30:29 +0800 | [diff] [blame] | 2703 | #endif |
Pengyu Lv | 4938a56 | 2023-01-16 11:28:49 +0800 | [diff] [blame] | 2704 | MBEDTLS_SSL_PRINT_TICKET_FLAGS(4, session->ticket_flags); |
Pengyu Lv | 9f92695 | 2022-11-17 15:22:33 +0800 | [diff] [blame] | 2705 | |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2706 | /* Generate ticket_age_add */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2707 | if ((ret = ssl->conf->f_rng(ssl->conf->p_rng, |
| 2708 | (unsigned char *) &session->ticket_age_add, |
| 2709 | sizeof(session->ticket_age_add)) != 0)) { |
| 2710 | MBEDTLS_SSL_DEBUG_RET(1, "generate_ticket_age_add", ret); |
| 2711 | return ret; |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2712 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2713 | MBEDTLS_SSL_DEBUG_MSG(3, ("ticket_age_add: %u", |
| 2714 | (unsigned int) session->ticket_age_add)); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2715 | |
| 2716 | /* Generate ticket_nonce */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2717 | ret = ssl->conf->f_rng(ssl->conf->p_rng, ticket_nonce, ticket_nonce_size); |
| 2718 | if (ret != 0) { |
| 2719 | MBEDTLS_SSL_DEBUG_RET(1, "generate_ticket_nonce", ret); |
| 2720 | return ret; |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2721 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2722 | MBEDTLS_SSL_DEBUG_BUF(3, "ticket_nonce:", |
| 2723 | ticket_nonce, ticket_nonce_size); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2724 | |
| 2725 | ciphersuite_info = |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2726 | (mbedtls_ssl_ciphersuite_t *) ssl->handshake->ciphersuite_info; |
| 2727 | psa_hash_alg = mbedtls_psa_translate_md(ciphersuite_info->mac); |
| 2728 | hash_length = PSA_HASH_LENGTH(psa_hash_alg); |
| 2729 | if (hash_length == -1 || |
| 2730 | (size_t) hash_length > sizeof(session->resumption_key)) { |
| 2731 | return MBEDTLS_ERR_SSL_INTERNAL_ERROR; |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2732 | } |
| 2733 | |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2734 | /* In this code the psk key length equals the length of the hash */ |
| 2735 | session->resumption_key_len = hash_length; |
| 2736 | session->ciphersuite = ciphersuite_info->id; |
| 2737 | |
| 2738 | /* Compute resumption key |
| 2739 | * |
| 2740 | * HKDF-Expand-Label( resumption_master_secret, |
| 2741 | * "resumption", ticket_nonce, Hash.length ) |
| 2742 | */ |
| 2743 | ret = mbedtls_ssl_tls13_hkdf_expand_label( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2744 | psa_hash_alg, |
| 2745 | session->app_secrets.resumption_master_secret, |
| 2746 | hash_length, |
| 2747 | MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN(resumption), |
| 2748 | ticket_nonce, |
| 2749 | ticket_nonce_size, |
| 2750 | session->resumption_key, |
| 2751 | hash_length); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2752 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2753 | if (ret != 0) { |
| 2754 | MBEDTLS_SSL_DEBUG_RET(2, |
| 2755 | "Creating the ticket-resumed PSK failed", |
| 2756 | ret); |
| 2757 | return ret; |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2758 | } |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2759 | MBEDTLS_SSL_DEBUG_BUF(3, "Ticket-resumed PSK", |
| 2760 | session->resumption_key, |
| 2761 | session->resumption_key_len); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2762 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2763 | MBEDTLS_SSL_DEBUG_BUF(3, "resumption_master_secret", |
| 2764 | session->app_secrets.resumption_master_secret, |
| 2765 | hash_length); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2766 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2767 | return 0; |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2768 | } |
| 2769 | |
| 2770 | /* This function creates a NewSessionTicket message in the following format: |
| 2771 | * |
| 2772 | * struct { |
| 2773 | * uint32 ticket_lifetime; |
| 2774 | * uint32 ticket_age_add; |
| 2775 | * opaque ticket_nonce<0..255>; |
| 2776 | * opaque ticket<1..2^16-1>; |
| 2777 | * Extension extensions<0..2^16-2>; |
| 2778 | * } NewSessionTicket; |
| 2779 | * |
| 2780 | * The ticket inside the NewSessionTicket message is an encrypted container |
| 2781 | * carrying the necessary information so that the server is later able to |
| 2782 | * re-start the communication. |
| 2783 | * |
| 2784 | * The following fields are placed inside the ticket by the |
| 2785 | * f_ticket_write() function: |
| 2786 | * |
| 2787 | * - creation time (start) |
| 2788 | * - flags (flags) |
| 2789 | * - age add (ticket_age_add) |
| 2790 | * - key (key) |
| 2791 | * - key length (key_len) |
| 2792 | * - ciphersuite (ciphersuite) |
| 2793 | */ |
| 2794 | MBEDTLS_CHECK_RETURN_CRITICAL |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2795 | static int ssl_tls13_write_new_session_ticket_body(mbedtls_ssl_context *ssl, |
| 2796 | unsigned char *buf, |
| 2797 | unsigned char *end, |
| 2798 | size_t *out_len, |
| 2799 | unsigned char *ticket_nonce, |
| 2800 | size_t ticket_nonce_size) |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2801 | { |
| 2802 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2803 | unsigned char *p = buf; |
| 2804 | mbedtls_ssl_session *session = ssl->session; |
| 2805 | size_t ticket_len; |
| 2806 | uint32_t ticket_lifetime; |
| 2807 | |
| 2808 | *out_len = 0; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2809 | MBEDTLS_SSL_DEBUG_MSG(2, ("=> write NewSessionTicket msg")); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2810 | |
| 2811 | /* |
| 2812 | * ticket_lifetime 4 bytes |
| 2813 | * ticket_age_add 4 bytes |
| 2814 | * ticket_nonce 1 + ticket_nonce_size bytes |
| 2815 | * ticket >=2 bytes |
| 2816 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2817 | MBEDTLS_SSL_CHK_BUF_PTR(p, end, 4 + 4 + 1 + ticket_nonce_size + 2); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2818 | |
| 2819 | /* Generate ticket and ticket_lifetime */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2820 | ret = ssl->conf->f_ticket_write(ssl->conf->p_ticket, |
| 2821 | session, |
| 2822 | p + 9 + ticket_nonce_size + 2, |
| 2823 | end, |
| 2824 | &ticket_len, |
| 2825 | &ticket_lifetime); |
| 2826 | if (ret != 0) { |
| 2827 | MBEDTLS_SSL_DEBUG_RET(1, "write_ticket", ret); |
| 2828 | return ret; |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2829 | } |
| 2830 | /* RFC 8446 4.6.1 |
| 2831 | * ticket_lifetime: Indicates the lifetime in seconds as a 32-bit |
| 2832 | * unsigned integer in network byte order from the time of ticket |
| 2833 | * issuance. Servers MUST NOT use any value greater than |
| 2834 | * 604800 seconds (7 days). The value of zero indicates that the |
| 2835 | * ticket should be discarded immediately. Clients MUST NOT cache |
| 2836 | * tickets for longer than 7 days, regardless of the ticket_lifetime, |
| 2837 | * and MAY delete tickets earlier based on local policy. A server |
| 2838 | * MAY treat a ticket as valid for a shorter period of time than what |
| 2839 | * is stated in the ticket_lifetime. |
| 2840 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2841 | if (ticket_lifetime > 604800) { |
Xiaokang Qian | 28af501 | 2022-10-13 08:18:19 +0000 | [diff] [blame] | 2842 | ticket_lifetime = 604800; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2843 | } |
| 2844 | MBEDTLS_PUT_UINT32_BE(ticket_lifetime, p, 0); |
| 2845 | MBEDTLS_SSL_DEBUG_MSG(3, ("ticket_lifetime: %u", |
| 2846 | (unsigned int) ticket_lifetime)); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2847 | |
| 2848 | /* Write ticket_age_add */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2849 | MBEDTLS_PUT_UINT32_BE(session->ticket_age_add, p, 4); |
| 2850 | MBEDTLS_SSL_DEBUG_MSG(3, ("ticket_age_add: %u", |
| 2851 | (unsigned int) session->ticket_age_add)); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2852 | |
| 2853 | /* Write ticket_nonce */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2854 | p[8] = (unsigned char) ticket_nonce_size; |
| 2855 | if (ticket_nonce_size > 0) { |
| 2856 | memcpy(p + 9, ticket_nonce, ticket_nonce_size); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2857 | } |
| 2858 | p += 9 + ticket_nonce_size; |
| 2859 | |
| 2860 | /* Write ticket */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2861 | MBEDTLS_PUT_UINT16_BE(ticket_len, p, 0); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2862 | p += 2; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2863 | MBEDTLS_SSL_DEBUG_BUF(4, "ticket", p, ticket_len); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2864 | p += ticket_len; |
| 2865 | |
| 2866 | /* Ticket Extensions |
| 2867 | * |
| 2868 | * Note: We currently don't have any extensions. |
| 2869 | * Set length to zero. |
| 2870 | */ |
Jerry Yu | edab637 | 2022-10-31 14:37:31 +0800 | [diff] [blame] | 2871 | ssl->handshake->sent_extensions = MBEDTLS_SSL_EXT_MASK_NONE; |
| 2872 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2873 | MBEDTLS_SSL_CHK_BUF_PTR(p, end, 2); |
| 2874 | MBEDTLS_PUT_UINT16_BE(0, p, 0); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2875 | p += 2; |
| 2876 | |
| 2877 | *out_len = p - buf; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2878 | MBEDTLS_SSL_DEBUG_BUF(4, "ticket", buf, *out_len); |
| 2879 | MBEDTLS_SSL_DEBUG_MSG(2, ("<= write new session ticket")); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2880 | |
Jerry Yu | 7de2ff0 | 2022-11-08 21:43:46 +0800 | [diff] [blame] | 2881 | MBEDTLS_SSL_PRINT_EXTS( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2882 | 3, MBEDTLS_SSL_HS_NEW_SESSION_TICKET, ssl->handshake->sent_extensions); |
Jerry Yu | 4b8f2f7 | 2022-10-31 13:31:22 +0800 | [diff] [blame] | 2883 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2884 | return 0; |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2885 | } |
| 2886 | |
| 2887 | /* |
Jerry Yu | a8d3c50 | 2022-10-30 14:51:23 +0800 | [diff] [blame] | 2888 | * Handler for MBEDTLS_SSL_TLS1_3_NEW_SESSION_TICKET |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2889 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2890 | static int ssl_tls13_write_new_session_ticket(mbedtls_ssl_context *ssl) |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2891 | { |
| 2892 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 2893 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2894 | MBEDTLS_SSL_PROC_CHK_NEG(ssl_tls13_write_new_session_ticket_coordinate(ssl)); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2895 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2896 | if (ret == SSL_NEW_SESSION_TICKET_WRITE) { |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2897 | unsigned char ticket_nonce[MBEDTLS_SSL_TLS1_3_TICKET_NONCE_LENGTH]; |
| 2898 | unsigned char *buf; |
| 2899 | size_t buf_len, msg_len; |
| 2900 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2901 | MBEDTLS_SSL_PROC_CHK(ssl_tls13_prepare_new_session_ticket( |
| 2902 | ssl, ticket_nonce, sizeof(ticket_nonce))); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2903 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2904 | MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_start_handshake_msg(ssl, |
| 2905 | MBEDTLS_SSL_HS_NEW_SESSION_TICKET, |
| 2906 | &buf, &buf_len)); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2907 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2908 | MBEDTLS_SSL_PROC_CHK(ssl_tls13_write_new_session_ticket_body( |
| 2909 | ssl, buf, buf + buf_len, &msg_len, |
| 2910 | ticket_nonce, sizeof(ticket_nonce))); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2911 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2912 | MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_finish_handshake_msg( |
| 2913 | ssl, buf_len, msg_len)); |
Jerry Yu | fca4d57 | 2022-07-21 10:37:48 +0800 | [diff] [blame] | 2914 | |
Jerry Yu | 359e65f | 2022-09-22 23:47:43 +0800 | [diff] [blame] | 2915 | /* Limit session tickets count to one when resumption connection. |
| 2916 | * |
| 2917 | * See document of mbedtls_ssl_conf_new_session_tickets. |
| 2918 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2919 | if (ssl->handshake->resume == 1) { |
Jerry Yu | 359e65f | 2022-09-22 23:47:43 +0800 | [diff] [blame] | 2920 | ssl->handshake->new_session_tickets_count = 0; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2921 | } else { |
Jerry Yu | 359e65f | 2022-09-22 23:47:43 +0800 | [diff] [blame] | 2922 | ssl->handshake->new_session_tickets_count--; |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2923 | } |
Jerry Yu | b7e3fa7 | 2022-09-22 11:07:18 +0800 | [diff] [blame] | 2924 | |
Jerry Yu | a8d3c50 | 2022-10-30 14:51:23 +0800 | [diff] [blame] | 2925 | mbedtls_ssl_handshake_set_state( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2926 | ssl, MBEDTLS_SSL_TLS1_3_NEW_SESSION_TICKET_FLUSH); |
| 2927 | } else { |
| 2928 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_HANDSHAKE_OVER); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2929 | } |
| 2930 | |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2931 | cleanup: |
| 2932 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2933 | return ret; |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 2934 | } |
| 2935 | #endif /* MBEDTLS_SSL_SESSION_TICKETS */ |
| 2936 | |
| 2937 | /* |
XiaokangQian | e8ff350 | 2022-04-22 02:34:40 +0000 | [diff] [blame] | 2938 | * TLS 1.3 State Machine -- server side |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2939 | */ |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2940 | int mbedtls_ssl_tls13_handshake_server_step(mbedtls_ssl_context *ssl) |
Jerry Yu | b9930e7 | 2021-08-06 17:11:51 +0800 | [diff] [blame] | 2941 | { |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 2942 | int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2943 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2944 | if (ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER || ssl->handshake == NULL) { |
| 2945 | return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; |
| 2946 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2947 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2948 | MBEDTLS_SSL_DEBUG_MSG(2, ("tls13 server state: %s(%d)", |
| 2949 | mbedtls_ssl_states_str(ssl->state), |
| 2950 | ssl->state)); |
Jerry Yu | 6e81b27 | 2021-09-27 11:16:17 +0800 | [diff] [blame] | 2951 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2952 | switch (ssl->state) { |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2953 | /* start state */ |
| 2954 | case MBEDTLS_SSL_HELLO_REQUEST: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2955 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_CLIENT_HELLO); |
XiaokangQian | 0803755 | 2022-04-20 07:16:41 +0000 | [diff] [blame] | 2956 | ret = 0; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2957 | break; |
| 2958 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2959 | case MBEDTLS_SSL_CLIENT_HELLO: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2960 | ret = ssl_tls13_process_client_hello(ssl); |
| 2961 | if (ret != 0) { |
| 2962 | MBEDTLS_SSL_DEBUG_RET(1, "ssl_tls13_process_client_hello", ret); |
| 2963 | } |
Jerry Yu | f41553b | 2022-05-09 22:20:30 +0800 | [diff] [blame] | 2964 | break; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2965 | |
Jerry Yu | f41553b | 2022-05-09 22:20:30 +0800 | [diff] [blame] | 2966 | case MBEDTLS_SSL_HELLO_RETRY_REQUEST: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2967 | ret = ssl_tls13_write_hello_retry_request(ssl); |
| 2968 | if (ret != 0) { |
| 2969 | MBEDTLS_SSL_DEBUG_RET(1, "ssl_tls13_write_hello_retry_request", ret); |
| 2970 | return ret; |
Jerry Yu | f41553b | 2022-05-09 22:20:30 +0800 | [diff] [blame] | 2971 | } |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 2972 | break; |
| 2973 | |
Jerry Yu | 5b64ae9 | 2022-03-30 17:15:02 +0800 | [diff] [blame] | 2974 | case MBEDTLS_SSL_SERVER_HELLO: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2975 | ret = ssl_tls13_write_server_hello(ssl); |
Jerry Yu | 5b64ae9 | 2022-03-30 17:15:02 +0800 | [diff] [blame] | 2976 | break; |
| 2977 | |
Xiaofei Bai | cba64af | 2022-02-15 10:00:56 +0000 | [diff] [blame] | 2978 | case MBEDTLS_SSL_ENCRYPTED_EXTENSIONS: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2979 | ret = ssl_tls13_write_encrypted_extensions(ssl); |
| 2980 | if (ret != 0) { |
| 2981 | MBEDTLS_SSL_DEBUG_RET(1, "ssl_tls13_write_encrypted_extensions", ret); |
| 2982 | return ret; |
Xiaofei Bai | cba64af | 2022-02-15 10:00:56 +0000 | [diff] [blame] | 2983 | } |
Jerry Yu | 4833056 | 2022-05-06 21:35:44 +0800 | [diff] [blame] | 2984 | break; |
Jerry Yu | 6a2cd9e | 2022-05-05 11:14:19 +0800 | [diff] [blame] | 2985 | |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 2986 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED) |
Xiaofei Bai | 9ca09d4 | 2022-02-14 12:57:18 +0000 | [diff] [blame] | 2987 | case MBEDTLS_SSL_CERTIFICATE_REQUEST: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2988 | ret = ssl_tls13_write_certificate_request(ssl); |
Xiaofei Bai | 9ca09d4 | 2022-02-14 12:57:18 +0000 | [diff] [blame] | 2989 | break; |
Xiaofei Bai | 9ca09d4 | 2022-02-14 12:57:18 +0000 | [diff] [blame] | 2990 | |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2991 | case MBEDTLS_SSL_SERVER_CERTIFICATE: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2992 | ret = ssl_tls13_write_server_certificate(ssl); |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2993 | break; |
| 2994 | |
| 2995 | case MBEDTLS_SSL_CERTIFICATE_VERIFY: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 2996 | ret = ssl_tls13_write_certificate_verify(ssl); |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2997 | break; |
Ronald Cron | 928cbd3 | 2022-10-04 16:14:26 +0200 | [diff] [blame] | 2998 | #endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED */ |
Jerry Yu | 83da34e | 2022-04-16 13:59:52 +0800 | [diff] [blame] | 2999 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 3000 | /* |
| 3001 | * Injection of dummy-CCS's for middlebox compatibility |
| 3002 | */ |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 3003 | #if defined(MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE) |
Gabor Mezei | f7044ea | 2022-06-28 16:01:49 +0200 | [diff] [blame] | 3004 | case MBEDTLS_SSL_SERVER_CCS_AFTER_HELLO_RETRY_REQUEST: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 3005 | ret = mbedtls_ssl_tls13_write_change_cipher_spec(ssl); |
| 3006 | if (ret == 0) { |
| 3007 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_CLIENT_HELLO); |
| 3008 | } |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 3009 | break; |
| 3010 | |
| 3011 | case MBEDTLS_SSL_SERVER_CCS_AFTER_SERVER_HELLO: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 3012 | ret = mbedtls_ssl_tls13_write_change_cipher_spec(ssl); |
| 3013 | if (ret == 0) { |
| 3014 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_ENCRYPTED_EXTENSIONS); |
| 3015 | } |
Gabor Mezei | 7b39bf1 | 2022-05-24 16:04:14 +0200 | [diff] [blame] | 3016 | break; |
| 3017 | #endif /* MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE */ |
| 3018 | |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 3019 | case MBEDTLS_SSL_SERVER_FINISHED: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 3020 | ret = ssl_tls13_write_server_finished(ssl); |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 3021 | break; |
| 3022 | |
| 3023 | case MBEDTLS_SSL_CLIENT_FINISHED: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 3024 | ret = ssl_tls13_process_client_finished(ssl); |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 3025 | break; |
| 3026 | |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 3027 | case MBEDTLS_SSL_HANDSHAKE_WRAPUP: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 3028 | ret = ssl_tls13_handshake_wrapup(ssl); |
Jerry Yu | 69dd8d4 | 2022-04-16 12:51:26 +0800 | [diff] [blame] | 3029 | break; |
| 3030 | |
Ronald Cron | 766c0cd | 2022-10-18 12:17:11 +0200 | [diff] [blame] | 3031 | #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED) |
XiaokangQian | 6b916b1 | 2022-04-25 07:29:34 +0000 | [diff] [blame] | 3032 | case MBEDTLS_SSL_CLIENT_CERTIFICATE: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 3033 | ret = mbedtls_ssl_tls13_process_certificate(ssl); |
| 3034 | if (ret == 0) { |
| 3035 | if (ssl->session_negotiate->peer_cert != NULL) { |
Ronald Cron | 209cae9 | 2022-06-07 10:30:19 +0200 | [diff] [blame] | 3036 | mbedtls_ssl_handshake_set_state( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 3037 | ssl, MBEDTLS_SSL_CLIENT_CERTIFICATE_VERIFY); |
| 3038 | } else { |
| 3039 | MBEDTLS_SSL_DEBUG_MSG(2, ("skip parse certificate verify")); |
Ronald Cron | 209cae9 | 2022-06-07 10:30:19 +0200 | [diff] [blame] | 3040 | mbedtls_ssl_handshake_set_state( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 3041 | ssl, MBEDTLS_SSL_CLIENT_FINISHED); |
Ronald Cron | 1938588 | 2022-06-15 16:26:13 +0200 | [diff] [blame] | 3042 | } |
XiaokangQian | 6b916b1 | 2022-04-25 07:29:34 +0000 | [diff] [blame] | 3043 | } |
| 3044 | break; |
| 3045 | |
| 3046 | case MBEDTLS_SSL_CLIENT_CERTIFICATE_VERIFY: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 3047 | ret = mbedtls_ssl_tls13_process_certificate_verify(ssl); |
| 3048 | if (ret == 0) { |
XiaokangQian | 6b916b1 | 2022-04-25 07:29:34 +0000 | [diff] [blame] | 3049 | mbedtls_ssl_handshake_set_state( |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 3050 | ssl, MBEDTLS_SSL_CLIENT_FINISHED); |
XiaokangQian | 6b916b1 | 2022-04-25 07:29:34 +0000 | [diff] [blame] | 3051 | } |
| 3052 | break; |
Ronald Cron | 766c0cd | 2022-10-18 12:17:11 +0200 | [diff] [blame] | 3053 | #endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED */ |
XiaokangQian | 6b916b1 | 2022-04-25 07:29:34 +0000 | [diff] [blame] | 3054 | |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 3055 | #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
Jerry Yu | a8d3c50 | 2022-10-30 14:51:23 +0800 | [diff] [blame] | 3056 | case MBEDTLS_SSL_TLS1_3_NEW_SESSION_TICKET: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 3057 | ret = ssl_tls13_write_new_session_ticket(ssl); |
| 3058 | if (ret != 0) { |
| 3059 | MBEDTLS_SSL_DEBUG_RET(1, |
| 3060 | "ssl_tls13_write_new_session_ticket ", |
| 3061 | ret); |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 3062 | } |
| 3063 | break; |
Jerry Yu | a8d3c50 | 2022-10-30 14:51:23 +0800 | [diff] [blame] | 3064 | case MBEDTLS_SSL_TLS1_3_NEW_SESSION_TICKET_FLUSH: |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 3065 | /* This state is necessary to do the flush of the New Session |
Jerry Yu | a8d3c50 | 2022-10-30 14:51:23 +0800 | [diff] [blame] | 3066 | * Ticket message written in MBEDTLS_SSL_TLS1_3_NEW_SESSION_TICKET |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 3067 | * as part of ssl_prepare_handshake_step. |
| 3068 | */ |
| 3069 | ret = 0; |
Jerry Yu | d4e7500 | 2022-08-09 13:33:50 +0800 | [diff] [blame] | 3070 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 3071 | if (ssl->handshake->new_session_tickets_count == 0) { |
| 3072 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_HANDSHAKE_OVER); |
| 3073 | } else { |
| 3074 | mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_TLS1_3_NEW_SESSION_TICKET); |
| 3075 | } |
Jerry Yu | e67bef4 | 2022-07-07 07:29:42 +0000 | [diff] [blame] | 3076 | break; |
| 3077 | |
| 3078 | #endif /* MBEDTLS_SSL_SESSION_TICKETS */ |
| 3079 | |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 3080 | default: |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 3081 | MBEDTLS_SSL_DEBUG_MSG(1, ("invalid state %d", ssl->state)); |
| 3082 | return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; |
XiaokangQian | 7807f9f | 2022-02-15 10:04:37 +0000 | [diff] [blame] | 3083 | } |
| 3084 | |
Gilles Peskine | 449bd83 | 2023-01-11 14:50:10 +0100 | [diff] [blame] | 3085 | return ret; |
Jerry Yu | b9930e7 | 2021-08-06 17:11:51 +0800 | [diff] [blame] | 3086 | } |
Jerry Yu | 3cc4c2a | 2021-08-06 16:29:08 +0800 | [diff] [blame] | 3087 | |
Jerry Yu | fb4b647 | 2022-01-27 15:03:26 +0800 | [diff] [blame] | 3088 | #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_PROTO_TLS1_3 */ |