David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1 | /* Copyright (c) 2016, Google Inc. |
| 2 | * |
| 3 | * Permission to use, copy, modify, and/or distribute this software for any |
| 4 | * purpose with or without fee is hereby granted, provided that the above |
| 5 | * copyright notice and this permission notice appear in all copies. |
| 6 | * |
| 7 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 8 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 9 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
| 10 | * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 11 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| 12 | * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| 13 | * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ |
| 14 | |
| 15 | #include <openssl/ssl.h> |
| 16 | |
| 17 | #include <assert.h> |
| 18 | #include <string.h> |
| 19 | |
| 20 | #include <openssl/bytestring.h> |
| 21 | #include <openssl/err.h> |
| 22 | #include <openssl/hkdf.h> |
| 23 | #include <openssl/mem.h> |
| 24 | #include <openssl/stack.h> |
| 25 | #include <openssl/x509.h> |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 26 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 27 | #include "../crypto/internal.h" |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 28 | #include "internal.h" |
| 29 | |
| 30 | |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 31 | /* kMaxKeyUpdates is the number of consecutive KeyUpdates that will be |
| 32 | * processed. Without this limit an attacker could force unbounded processing |
| 33 | * without being able to return application data. */ |
| 34 | static const uint8_t kMaxKeyUpdates = 32; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 35 | |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 36 | int tls13_handshake(SSL_HANDSHAKE *hs, int *out_early_return) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 37 | SSL *const ssl = hs->ssl; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 38 | for (;;) { |
| 39 | /* Resolve the operation the handshake was waiting on. */ |
| 40 | switch (hs->wait) { |
| 41 | case ssl_hs_error: |
| 42 | OPENSSL_PUT_ERROR(SSL, SSL_R_SSL_HANDSHAKE_FAILURE); |
| 43 | return -1; |
| 44 | |
| 45 | case ssl_hs_flush: |
| 46 | case ssl_hs_flush_and_read_message: { |
David Benjamin | f31229b | 2017-01-25 14:08:15 -0500 | [diff] [blame] | 47 | int ret = ssl->method->flush_flight(ssl); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 48 | if (ret <= 0) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 49 | return ret; |
| 50 | } |
| 51 | if (hs->wait != ssl_hs_flush_and_read_message) { |
| 52 | break; |
| 53 | } |
| 54 | ssl->method->expect_flight(ssl); |
| 55 | hs->wait = ssl_hs_read_message; |
| 56 | /* Fall-through. */ |
| 57 | } |
| 58 | |
| 59 | case ssl_hs_read_message: { |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 60 | int ret = ssl->method->ssl_get_message(ssl); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 61 | if (ret <= 0) { |
| 62 | return ret; |
| 63 | } |
| 64 | break; |
| 65 | } |
| 66 | |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 67 | case ssl_hs_read_end_of_early_data: { |
| 68 | if (ssl->s3->hs->can_early_read) { |
| 69 | /* While we are processing early data, the handshake returns early. */ |
| 70 | *out_early_return = 1; |
| 71 | return 1; |
| 72 | } |
| 73 | hs->wait = ssl_hs_ok; |
| 74 | break; |
| 75 | } |
| 76 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 77 | case ssl_hs_x509_lookup: |
| 78 | ssl->rwstate = SSL_X509_LOOKUP; |
| 79 | hs->wait = ssl_hs_ok; |
| 80 | return -1; |
| 81 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 82 | case ssl_hs_channel_id_lookup: |
| 83 | ssl->rwstate = SSL_CHANNEL_ID_LOOKUP; |
| 84 | hs->wait = ssl_hs_ok; |
| 85 | return -1; |
| 86 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 87 | case ssl_hs_private_key_operation: |
| 88 | ssl->rwstate = SSL_PRIVATE_KEY_OPERATION; |
| 89 | hs->wait = ssl_hs_ok; |
| 90 | return -1; |
| 91 | |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 92 | case ssl_hs_pending_ticket: |
| 93 | ssl->rwstate = SSL_PENDING_TICKET; |
| 94 | hs->wait = ssl_hs_ok; |
| 95 | return -1; |
| 96 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 97 | case ssl_hs_ok: |
| 98 | break; |
| 99 | } |
| 100 | |
| 101 | /* Run the state machine again. */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 102 | hs->wait = hs->do_tls13_handshake(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 103 | if (hs->wait == ssl_hs_error) { |
| 104 | /* Don't loop around to avoid a stray |SSL_R_SSL_HANDSHAKE_FAILURE| the |
| 105 | * first time around. */ |
| 106 | return -1; |
| 107 | } |
| 108 | if (hs->wait == ssl_hs_ok) { |
| 109 | /* The handshake has completed. */ |
| 110 | return 1; |
| 111 | } |
| 112 | |
| 113 | /* Otherwise, loop to the beginning and resolve what was blocking the |
| 114 | * handshake. */ |
| 115 | } |
| 116 | } |
| 117 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 118 | int tls13_get_cert_verify_signature_input( |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 119 | SSL_HANDSHAKE *hs, uint8_t **out, size_t *out_len, |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 120 | enum ssl_cert_verify_context_t cert_verify_context) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 121 | CBB cbb; |
| 122 | if (!CBB_init(&cbb, 64 + 33 + 1 + 2 * EVP_MAX_MD_SIZE)) { |
| 123 | goto err; |
| 124 | } |
| 125 | |
| 126 | for (size_t i = 0; i < 64; i++) { |
| 127 | if (!CBB_add_u8(&cbb, 0x20)) { |
| 128 | goto err; |
| 129 | } |
| 130 | } |
| 131 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 132 | const uint8_t *context; |
| 133 | size_t context_len; |
| 134 | if (cert_verify_context == ssl_cert_verify_server) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 135 | /* Include the NUL byte. */ |
| 136 | static const char kContext[] = "TLS 1.3, server CertificateVerify"; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 137 | context = (const uint8_t *)kContext; |
| 138 | context_len = sizeof(kContext); |
| 139 | } else if (cert_verify_context == ssl_cert_verify_client) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 140 | static const char kContext[] = "TLS 1.3, client CertificateVerify"; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 141 | context = (const uint8_t *)kContext; |
| 142 | context_len = sizeof(kContext); |
| 143 | } else if (cert_verify_context == ssl_cert_verify_channel_id) { |
| 144 | static const char kContext[] = "TLS 1.3, Channel ID"; |
| 145 | context = (const uint8_t *)kContext; |
| 146 | context_len = sizeof(kContext); |
| 147 | } else { |
| 148 | goto err; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 149 | } |
| 150 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 151 | if (!CBB_add_bytes(&cbb, context, context_len)) { |
| 152 | goto err; |
| 153 | } |
| 154 | |
| 155 | uint8_t context_hash[EVP_MAX_MD_SIZE]; |
| 156 | size_t context_hash_len; |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 157 | if (!SSL_TRANSCRIPT_get_hash(&hs->transcript, context_hash, |
| 158 | &context_hash_len) || |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 159 | !CBB_add_bytes(&cbb, context_hash, context_hash_len) || |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 160 | !CBB_finish(&cbb, out, out_len)) { |
| 161 | goto err; |
| 162 | } |
| 163 | |
| 164 | return 1; |
| 165 | |
| 166 | err: |
| 167 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
| 168 | CBB_cleanup(&cbb); |
| 169 | return 0; |
| 170 | } |
| 171 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 172 | int tls13_process_certificate(SSL_HANDSHAKE *hs, int allow_anonymous) { |
| 173 | SSL *const ssl = hs->ssl; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 174 | CBS cbs, context, certificate_list; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 175 | CBS_init(&cbs, ssl->init_msg, ssl->init_num); |
| 176 | if (!CBS_get_u8_length_prefixed(&cbs, &context) || |
| 177 | CBS_len(&context) != 0) { |
| 178 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 179 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | const int retain_sha256 = |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 184 | ssl->server && ssl->retain_only_sha256_of_client_certs; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 185 | int ret = 0; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 186 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 187 | EVP_PKEY *pkey = NULL; |
| 188 | STACK_OF(CRYPTO_BUFFER) *certs = sk_CRYPTO_BUFFER_new_null(); |
| 189 | if (certs == NULL) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 190 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 191 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 192 | goto err; |
| 193 | } |
| 194 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 195 | if (!CBS_get_u24_length_prefixed(&cbs, &certificate_list)) { |
| 196 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 197 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 198 | goto err; |
| 199 | } |
| 200 | |
| 201 | while (CBS_len(&certificate_list) > 0) { |
| 202 | CBS certificate, extensions; |
| 203 | if (!CBS_get_u24_length_prefixed(&certificate_list, &certificate) || |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 204 | !CBS_get_u16_length_prefixed(&certificate_list, &extensions) || |
| 205 | CBS_len(&certificate) == 0) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 206 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 207 | OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_LENGTH_MISMATCH); |
| 208 | goto err; |
| 209 | } |
| 210 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 211 | if (sk_CRYPTO_BUFFER_num(certs) == 0) { |
| 212 | pkey = ssl_cert_parse_pubkey(&certificate); |
| 213 | if (pkey == NULL) { |
| 214 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 215 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 216 | goto err; |
| 217 | } |
| 218 | /* TLS 1.3 always uses certificate keys for signing thus the correct |
| 219 | * keyUsage is enforced. */ |
| 220 | if (!ssl_cert_check_digital_signature_key_usage(&certificate)) { |
| 221 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
| 222 | goto err; |
| 223 | } |
| 224 | |
| 225 | if (retain_sha256) { |
| 226 | /* Retain the hash of the leaf certificate if requested. */ |
| 227 | SHA256(CBS_data(&certificate), CBS_len(&certificate), |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 228 | hs->new_session->peer_sha256); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 229 | } |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 230 | } |
| 231 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 232 | CRYPTO_BUFFER *buf = |
| 233 | CRYPTO_BUFFER_new_from_CBS(&certificate, ssl->ctx->pool); |
| 234 | if (buf == NULL || |
| 235 | !sk_CRYPTO_BUFFER_push(certs, buf)) { |
| 236 | CRYPTO_BUFFER_free(buf); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 237 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 238 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 239 | goto err; |
| 240 | } |
| 241 | |
| 242 | /* Parse out the extensions. */ |
| 243 | int have_status_request = 0, have_sct = 0; |
| 244 | CBS status_request, sct; |
| 245 | const SSL_EXTENSION_TYPE ext_types[] = { |
| 246 | {TLSEXT_TYPE_status_request, &have_status_request, &status_request}, |
| 247 | {TLSEXT_TYPE_certificate_timestamp, &have_sct, &sct}, |
| 248 | }; |
| 249 | |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 250 | uint8_t alert = SSL_AD_DECODE_ERROR; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 251 | if (!ssl_parse_extensions(&extensions, &alert, ext_types, |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 252 | OPENSSL_ARRAY_SIZE(ext_types), |
| 253 | 0 /* reject unknown */)) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 254 | ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); |
| 255 | goto err; |
| 256 | } |
| 257 | |
| 258 | /* All Certificate extensions are parsed, but only the leaf extensions are |
| 259 | * stored. */ |
| 260 | if (have_status_request) { |
| 261 | if (ssl->server || !ssl->ocsp_stapling_enabled) { |
| 262 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION); |
| 263 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_EXTENSION); |
| 264 | goto err; |
| 265 | } |
| 266 | |
| 267 | uint8_t status_type; |
| 268 | CBS ocsp_response; |
| 269 | if (!CBS_get_u8(&status_request, &status_type) || |
| 270 | status_type != TLSEXT_STATUSTYPE_ocsp || |
| 271 | !CBS_get_u24_length_prefixed(&status_request, &ocsp_response) || |
| 272 | CBS_len(&ocsp_response) == 0 || |
| 273 | CBS_len(&status_request) != 0) { |
| 274 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 275 | goto err; |
| 276 | } |
| 277 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 278 | if (sk_CRYPTO_BUFFER_num(certs) == 1 && |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 279 | !CBS_stow(&ocsp_response, &hs->new_session->ocsp_response, |
| 280 | &hs->new_session->ocsp_response_length)) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 281 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 282 | goto err; |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | if (have_sct) { |
| 287 | if (ssl->server || !ssl->signed_cert_timestamps_enabled) { |
| 288 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION); |
| 289 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_EXTENSION); |
| 290 | goto err; |
| 291 | } |
| 292 | |
| 293 | if (!ssl_is_sct_list_valid(&sct)) { |
| 294 | OPENSSL_PUT_ERROR(SSL, SSL_R_ERROR_PARSING_EXTENSION); |
| 295 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 296 | goto err; |
| 297 | } |
| 298 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 299 | if (sk_CRYPTO_BUFFER_num(certs) == 1 && |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 300 | !CBS_stow( |
| 301 | &sct, &hs->new_session->tlsext_signed_cert_timestamp_list, |
| 302 | &hs->new_session->tlsext_signed_cert_timestamp_list_length)) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 303 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 304 | goto err; |
| 305 | } |
| 306 | } |
| 307 | } |
| 308 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 309 | if (CBS_len(&cbs) != 0) { |
| 310 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 311 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 312 | goto err; |
| 313 | } |
| 314 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 315 | EVP_PKEY_free(hs->peer_pubkey); |
| 316 | hs->peer_pubkey = pkey; |
| 317 | pkey = NULL; |
| 318 | |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 319 | sk_CRYPTO_BUFFER_pop_free(hs->new_session->certs, CRYPTO_BUFFER_free); |
| 320 | hs->new_session->certs = certs; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 321 | certs = NULL; |
| 322 | |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 323 | if (!ssl->ctx->x509_method->session_cache_objects(hs->new_session)) { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 324 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 325 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 326 | goto err; |
| 327 | } |
| 328 | |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 329 | if (sk_CRYPTO_BUFFER_num(hs->new_session->certs) == 0) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 330 | if (!allow_anonymous) { |
| 331 | OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); |
David Benjamin | 95add82 | 2016-10-19 01:09:12 -0400 | [diff] [blame] | 332 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_CERTIFICATE_REQUIRED); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 333 | goto err; |
| 334 | } |
| 335 | |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 336 | /* OpenSSL returns X509_V_OK when no certificates are requested. This is |
| 337 | * classed by them as a bug, but it's assumed by at least NGINX. */ |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 338 | hs->new_session->verify_result = X509_V_OK; |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 339 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 340 | /* No certificate, so nothing more to do. */ |
| 341 | ret = 1; |
| 342 | goto err; |
| 343 | } |
| 344 | |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 345 | hs->new_session->peer_sha256_valid = retain_sha256; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 346 | |
Robert Sloan | 7d422bc | 2017-03-06 10:04:29 -0800 | [diff] [blame] | 347 | if (!ssl->ctx->x509_method->session_verify_cert_chain(hs->new_session, |
| 348 | ssl)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 349 | goto err; |
| 350 | } |
| 351 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 352 | ret = 1; |
| 353 | |
| 354 | err: |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 355 | sk_CRYPTO_BUFFER_pop_free(certs, CRYPTO_BUFFER_free); |
| 356 | EVP_PKEY_free(pkey); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 357 | return ret; |
| 358 | } |
| 359 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 360 | int tls13_process_certificate_verify(SSL_HANDSHAKE *hs) { |
| 361 | SSL *const ssl = hs->ssl; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 362 | int ret = 0; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 363 | uint8_t *msg = NULL; |
| 364 | size_t msg_len; |
| 365 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 366 | if (hs->peer_pubkey == NULL) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 367 | goto err; |
| 368 | } |
| 369 | |
| 370 | CBS cbs, signature; |
| 371 | uint16_t signature_algorithm; |
| 372 | CBS_init(&cbs, ssl->init_msg, ssl->init_num); |
| 373 | if (!CBS_get_u16(&cbs, &signature_algorithm) || |
| 374 | !CBS_get_u16_length_prefixed(&cbs, &signature) || |
| 375 | CBS_len(&cbs) != 0) { |
| 376 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 377 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 378 | goto err; |
| 379 | } |
| 380 | |
| 381 | int al; |
| 382 | if (!tls12_check_peer_sigalg(ssl, &al, signature_algorithm)) { |
| 383 | ssl3_send_alert(ssl, SSL3_AL_FATAL, al); |
| 384 | goto err; |
| 385 | } |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 386 | hs->new_session->peer_signature_algorithm = signature_algorithm; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 387 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 388 | if (!tls13_get_cert_verify_signature_input( |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 389 | hs, &msg, &msg_len, |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 390 | ssl->server ? ssl_cert_verify_client : ssl_cert_verify_server)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 391 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 392 | goto err; |
| 393 | } |
| 394 | |
| 395 | int sig_ok = |
| 396 | ssl_public_key_verify(ssl, CBS_data(&signature), CBS_len(&signature), |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 397 | signature_algorithm, hs->peer_pubkey, msg, msg_len); |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 398 | #if defined(BORINGSSL_UNSAFE_FUZZER_MODE) |
| 399 | sig_ok = 1; |
| 400 | ERR_clear_error(); |
| 401 | #endif |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 402 | if (!sig_ok) { |
| 403 | OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SIGNATURE); |
| 404 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR); |
| 405 | goto err; |
| 406 | } |
| 407 | |
| 408 | ret = 1; |
| 409 | |
| 410 | err: |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 411 | OPENSSL_free(msg); |
| 412 | return ret; |
| 413 | } |
| 414 | |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 415 | int tls13_process_finished(SSL_HANDSHAKE *hs, int use_saved_value) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 416 | SSL *const ssl = hs->ssl; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 417 | uint8_t verify_data_buf[EVP_MAX_MD_SIZE]; |
| 418 | const uint8_t *verify_data; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 419 | size_t verify_data_len; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 420 | if (use_saved_value) { |
| 421 | assert(ssl->server); |
| 422 | verify_data = hs->expected_client_finished; |
| 423 | verify_data_len = hs->hash_len; |
| 424 | } else { |
| 425 | if (!tls13_finished_mac(hs, verify_data_buf, &verify_data_len, |
| 426 | !ssl->server)) { |
| 427 | return 0; |
| 428 | } |
| 429 | verify_data = verify_data_buf; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 430 | } |
| 431 | |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 432 | int finished_ok = |
| 433 | ssl->init_num == verify_data_len && |
| 434 | CRYPTO_memcmp(verify_data, ssl->init_msg, verify_data_len) == 0; |
| 435 | #if defined(BORINGSSL_UNSAFE_FUZZER_MODE) |
| 436 | finished_ok = 1; |
| 437 | #endif |
| 438 | if (!finished_ok) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 439 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR); |
| 440 | OPENSSL_PUT_ERROR(SSL, SSL_R_DIGEST_CHECK_FAILED); |
| 441 | return 0; |
| 442 | } |
| 443 | |
| 444 | return 1; |
| 445 | } |
| 446 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 447 | int tls13_add_certificate(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 448 | SSL *const ssl = hs->ssl; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 449 | CBB cbb, body, certificate_list; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 450 | if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_CERTIFICATE) || |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 451 | /* The request context is always empty in the handshake. */ |
| 452 | !CBB_add_u8(&body, 0) || |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 453 | !CBB_add_u24_length_prefixed(&body, &certificate_list)) { |
| 454 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 455 | goto err; |
| 456 | } |
| 457 | |
| 458 | if (!ssl_has_certificate(ssl)) { |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 459 | if (!ssl_add_message_cbb(ssl, &cbb)) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 460 | goto err; |
| 461 | } |
| 462 | |
| 463 | return 1; |
| 464 | } |
| 465 | |
| 466 | CERT *cert = ssl->cert; |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 467 | CRYPTO_BUFFER *leaf_buf = sk_CRYPTO_BUFFER_value(cert->chain, 0); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 468 | CBB leaf, extensions; |
| 469 | if (!CBB_add_u24_length_prefixed(&certificate_list, &leaf) || |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 470 | !CBB_add_bytes(&leaf, CRYPTO_BUFFER_data(leaf_buf), |
| 471 | CRYPTO_BUFFER_len(leaf_buf)) || |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 472 | !CBB_add_u16_length_prefixed(&certificate_list, &extensions)) { |
| 473 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 474 | goto err; |
| 475 | } |
| 476 | |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 477 | if (hs->scts_requested && ssl->cert->signed_cert_timestamp_list != NULL) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 478 | CBB contents; |
| 479 | if (!CBB_add_u16(&extensions, TLSEXT_TYPE_certificate_timestamp) || |
| 480 | !CBB_add_u16_length_prefixed(&extensions, &contents) || |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 481 | !CBB_add_bytes( |
| 482 | &contents, |
| 483 | CRYPTO_BUFFER_data(ssl->cert->signed_cert_timestamp_list), |
| 484 | CRYPTO_BUFFER_len(ssl->cert->signed_cert_timestamp_list)) || |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 485 | !CBB_flush(&extensions)) { |
| 486 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 487 | goto err; |
| 488 | } |
| 489 | } |
| 490 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 491 | if (hs->ocsp_stapling_requested && |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 492 | ssl->cert->ocsp_response != NULL) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 493 | CBB contents, ocsp_response; |
| 494 | if (!CBB_add_u16(&extensions, TLSEXT_TYPE_status_request) || |
| 495 | !CBB_add_u16_length_prefixed(&extensions, &contents) || |
| 496 | !CBB_add_u8(&contents, TLSEXT_STATUSTYPE_ocsp) || |
| 497 | !CBB_add_u24_length_prefixed(&contents, &ocsp_response) || |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 498 | !CBB_add_bytes(&ocsp_response, |
| 499 | CRYPTO_BUFFER_data(ssl->cert->ocsp_response), |
| 500 | CRYPTO_BUFFER_len(ssl->cert->ocsp_response)) || |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 501 | !CBB_flush(&extensions)) { |
| 502 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 503 | goto err; |
| 504 | } |
| 505 | } |
| 506 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 507 | for (size_t i = 1; i < sk_CRYPTO_BUFFER_num(cert->chain); i++) { |
| 508 | CRYPTO_BUFFER *cert_buf = sk_CRYPTO_BUFFER_value(cert->chain, i); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 509 | CBB child; |
| 510 | if (!CBB_add_u24_length_prefixed(&certificate_list, &child) || |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 511 | !CBB_add_bytes(&child, CRYPTO_BUFFER_data(cert_buf), |
| 512 | CRYPTO_BUFFER_len(cert_buf)) || |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 513 | !CBB_add_u16(&certificate_list, 0 /* no extensions */)) { |
| 514 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 515 | goto err; |
| 516 | } |
| 517 | } |
| 518 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 519 | if (!ssl_add_message_cbb(ssl, &cbb)) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 520 | goto err; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 521 | } |
| 522 | |
| 523 | return 1; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 524 | |
| 525 | err: |
| 526 | CBB_cleanup(&cbb); |
| 527 | return 0; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 528 | } |
| 529 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 530 | enum ssl_private_key_result_t tls13_add_certificate_verify(SSL_HANDSHAKE *hs, |
| 531 | int is_first_run) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 532 | SSL *const ssl = hs->ssl; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 533 | enum ssl_private_key_result_t ret = ssl_private_key_failure; |
| 534 | uint8_t *msg = NULL; |
| 535 | size_t msg_len; |
| 536 | CBB cbb, body; |
| 537 | CBB_zero(&cbb); |
| 538 | |
| 539 | uint16_t signature_algorithm; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 540 | if (!tls1_choose_signature_algorithm(hs, &signature_algorithm)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 541 | goto err; |
| 542 | } |
| 543 | if (!ssl->method->init_message(ssl, &cbb, &body, |
| 544 | SSL3_MT_CERTIFICATE_VERIFY) || |
| 545 | !CBB_add_u16(&body, signature_algorithm)) { |
| 546 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 547 | goto err; |
| 548 | } |
| 549 | |
| 550 | /* Sign the digest. */ |
| 551 | CBB child; |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame^] | 552 | const size_t max_sig_len = EVP_PKEY_size(hs->local_pubkey); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 553 | uint8_t *sig; |
| 554 | size_t sig_len; |
| 555 | if (!CBB_add_u16_length_prefixed(&body, &child) || |
| 556 | !CBB_reserve(&child, &sig, max_sig_len)) { |
| 557 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 558 | goto err; |
| 559 | } |
| 560 | |
| 561 | enum ssl_private_key_result_t sign_result; |
| 562 | if (is_first_run) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 563 | if (!tls13_get_cert_verify_signature_input( |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 564 | hs, &msg, &msg_len, |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 565 | ssl->server ? ssl_cert_verify_server : ssl_cert_verify_client)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 566 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 567 | goto err; |
| 568 | } |
| 569 | sign_result = ssl_private_key_sign(ssl, sig, &sig_len, max_sig_len, |
| 570 | signature_algorithm, msg, msg_len); |
| 571 | } else { |
| 572 | sign_result = ssl_private_key_complete(ssl, sig, &sig_len, max_sig_len); |
| 573 | } |
| 574 | |
| 575 | if (sign_result != ssl_private_key_success) { |
| 576 | ret = sign_result; |
| 577 | goto err; |
| 578 | } |
| 579 | |
| 580 | if (!CBB_did_write(&child, sig_len) || |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 581 | !ssl_add_message_cbb(ssl, &cbb)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 582 | goto err; |
| 583 | } |
| 584 | |
| 585 | ret = ssl_private_key_success; |
| 586 | |
| 587 | err: |
| 588 | CBB_cleanup(&cbb); |
| 589 | OPENSSL_free(msg); |
| 590 | return ret; |
| 591 | } |
| 592 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 593 | int tls13_add_finished(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 594 | SSL *const ssl = hs->ssl; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 595 | size_t verify_data_len; |
| 596 | uint8_t verify_data[EVP_MAX_MD_SIZE]; |
| 597 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 598 | if (!tls13_finished_mac(hs, verify_data, &verify_data_len, ssl->server)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 599 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 600 | OPENSSL_PUT_ERROR(SSL, SSL_R_DIGEST_CHECK_FAILED); |
| 601 | return 0; |
| 602 | } |
| 603 | |
| 604 | CBB cbb, body; |
| 605 | if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_FINISHED) || |
| 606 | !CBB_add_bytes(&body, verify_data, verify_data_len) || |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 607 | !ssl_add_message_cbb(ssl, &cbb)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 608 | CBB_cleanup(&cbb); |
| 609 | return 0; |
| 610 | } |
| 611 | |
| 612 | return 1; |
| 613 | } |
| 614 | |
| 615 | static int tls13_receive_key_update(SSL *ssl) { |
David Benjamin | 95add82 | 2016-10-19 01:09:12 -0400 | [diff] [blame] | 616 | CBS cbs; |
| 617 | uint8_t key_update_request; |
| 618 | CBS_init(&cbs, ssl->init_msg, ssl->init_num); |
| 619 | if (!CBS_get_u8(&cbs, &key_update_request) || |
| 620 | CBS_len(&cbs) != 0 || |
| 621 | (key_update_request != SSL_KEY_UPDATE_NOT_REQUESTED && |
| 622 | key_update_request != SSL_KEY_UPDATE_REQUESTED)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 623 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 624 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 625 | return 0; |
| 626 | } |
| 627 | |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame^] | 628 | if (!tls13_rotate_traffic_key(ssl, evp_aead_open)) { |
| 629 | return 0; |
| 630 | } |
| 631 | |
| 632 | /* Acknowledge the KeyUpdate */ |
| 633 | if (key_update_request == SSL_KEY_UPDATE_REQUESTED && |
| 634 | !ssl->s3->key_update_pending) { |
| 635 | CBB cbb, body; |
| 636 | if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_KEY_UPDATE) || |
| 637 | !CBB_add_u8(&body, SSL_KEY_UPDATE_NOT_REQUESTED) || |
| 638 | !ssl_add_message_cbb(ssl, &cbb) || |
| 639 | !tls13_rotate_traffic_key(ssl, evp_aead_seal)) { |
| 640 | CBB_cleanup(&cbb); |
| 641 | return 0; |
| 642 | } |
| 643 | |
| 644 | /* Suppress KeyUpdate acknowledgments until this change is written to the |
| 645 | * wire. This prevents us from accumulating write obligations when read and |
| 646 | * write progress at different rates. See draft-ietf-tls-tls13-18, section |
| 647 | * 4.5.3. */ |
| 648 | ssl->s3->key_update_pending = 1; |
| 649 | } |
| 650 | |
| 651 | return 1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 652 | } |
| 653 | |
| 654 | int tls13_post_handshake(SSL *ssl) { |
| 655 | if (ssl->s3->tmp.message_type == SSL3_MT_KEY_UPDATE) { |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 656 | ssl->s3->key_update_count++; |
| 657 | if (ssl->s3->key_update_count > kMaxKeyUpdates) { |
| 658 | OPENSSL_PUT_ERROR(SSL, SSL_R_TOO_MANY_KEY_UPDATES); |
| 659 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); |
| 660 | return 0; |
| 661 | } |
| 662 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 663 | return tls13_receive_key_update(ssl); |
| 664 | } |
| 665 | |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 666 | ssl->s3->key_update_count = 0; |
| 667 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 668 | if (ssl->s3->tmp.message_type == SSL3_MT_NEW_SESSION_TICKET && |
| 669 | !ssl->server) { |
| 670 | return tls13_process_new_session_ticket(ssl); |
| 671 | } |
| 672 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 673 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); |
| 674 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE); |
| 675 | return 0; |
| 676 | } |