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> 26 27 #include "../crypto/internal.h" 28 #include "internal.h" 29 30 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; 35 36 int tls13_handshake(SSL_HANDSHAKE *hs, int *out_early_return) { 37 SSL *const ssl = hs->ssl; 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: { 47 int ret = ssl->method->flush_flight(ssl); 48 if (ret <= 0) { 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: { 60 int ret = ssl->method->ssl_get_message(ssl); 61 if (ret <= 0) { 62 return ret; 63 } 64 break; 65 } 66 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 77 case ssl_hs_x509_lookup: 78 ssl->rwstate = SSL_X509_LOOKUP; 79 hs->wait = ssl_hs_ok; 80 return -1; 81 82 case ssl_hs_channel_id_lookup: 83 ssl->rwstate = SSL_CHANNEL_ID_LOOKUP; 84 hs->wait = ssl_hs_ok; 85 return -1; 86 87 case ssl_hs_private_key_operation: 88 ssl->rwstate = SSL_PRIVATE_KEY_OPERATION; 89 hs->wait = ssl_hs_ok; 90 return -1; 91 92 case ssl_hs_pending_ticket: 93 ssl->rwstate = SSL_PENDING_TICKET; 94 hs->wait = ssl_hs_ok; 95 return -1; 96 97 case ssl_hs_ok: 98 break; 99 } 100 101 /* Run the state machine again. */ 102 hs->wait = hs->do_tls13_handshake(hs); 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 } 117 118 int tls13_get_cert_verify_signature_input( 119 SSL_HANDSHAKE *hs, uint8_t **out, size_t *out_len, 120 enum ssl_cert_verify_context_t cert_verify_context) { 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 } 131 132 const uint8_t *context; 133 size_t context_len; 134 if (cert_verify_context == ssl_cert_verify_server) { 135 /* Include the NUL byte. */ 136 static const char kContext[] = "TLS 1.3, server CertificateVerify"; 137 context = (const uint8_t *)kContext; 138 context_len = sizeof(kContext); 139 } else if (cert_verify_context == ssl_cert_verify_client) { 140 static const char kContext[] = "TLS 1.3, client CertificateVerify"; 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; 149 } 150 151 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; 157 if (!SSL_TRANSCRIPT_get_hash(&hs->transcript, context_hash, 158 &context_hash_len) || 159 !CBB_add_bytes(&cbb, context_hash, context_hash_len) || 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 } 171 172 int tls13_process_certificate(SSL_HANDSHAKE *hs, int allow_anonymous) { 173 SSL *const ssl = hs->ssl; 174 CBS cbs, context, certificate_list; 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 = 184 ssl->server && ssl->retain_only_sha256_of_client_certs; 185 int ret = 0; 186 187 EVP_PKEY *pkey = NULL; 188 STACK_OF(CRYPTO_BUFFER) *certs = sk_CRYPTO_BUFFER_new_null(); 189 if (certs == NULL) { 190 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); 191 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 192 goto err; 193 } 194 195 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) || 204 !CBS_get_u16_length_prefixed(&certificate_list, &extensions) || 205 CBS_len(&certificate) == 0) { 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 } 210 211 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), 228 hs->new_session->peer_sha256); 229 } 230 } 231 232 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); 237 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); 238 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 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 }; 249 250 uint8_t alert = SSL_AD_DECODE_ERROR; 251 if (!ssl_parse_extensions(&extensions, &alert, ext_types, 252 OPENSSL_ARRAY_SIZE(ext_types), 253 0 /* reject unknown */)) { 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 } 277 278 if (sk_CRYPTO_BUFFER_num(certs) == 1 && 279 !CBS_stow(&ocsp_response, &hs->new_session->ocsp_response, 280 &hs->new_session->ocsp_response_length)) { 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 } 298 299 if (sk_CRYPTO_BUFFER_num(certs) == 1 && 300 !CBS_stow( 301 &sct, &hs->new_session->tlsext_signed_cert_timestamp_list, 302 &hs->new_session->tlsext_signed_cert_timestamp_list_length)) { 303 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); 304 goto err; 305 } 306 } 307 } 308 309 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 } 314 315 EVP_PKEY_free(hs->peer_pubkey); 316 hs->peer_pubkey = pkey; 317 pkey = NULL; 318 319 sk_CRYPTO_BUFFER_pop_free(hs->new_session->certs, CRYPTO_BUFFER_free); 320 hs->new_session->certs = certs; 321 certs = NULL; 322 323 if (!ssl->ctx->x509_method->session_cache_objects(hs->new_session)) { 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 } 328 329 if (sk_CRYPTO_BUFFER_num(hs->new_session->certs) == 0) { 330 if (!allow_anonymous) { 331 OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 332 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_CERTIFICATE_REQUIRED); 333 goto err; 334 } 335 336 /* 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. */ 338 hs->new_session->verify_result = X509_V_OK; 339 340 /* No certificate, so nothing more to do. */ 341 ret = 1; 342 goto err; 343 } 344 345 hs->new_session->peer_sha256_valid = retain_sha256; 346 347 if (!ssl->ctx->x509_method->session_verify_cert_chain(hs->new_session, 348 ssl)) { 349 goto err; 350 } 351 352 ret = 1; 353 354 err: 355 sk_CRYPTO_BUFFER_pop_free(certs, CRYPTO_BUFFER_free); 356 EVP_PKEY_free(pkey); 357 return ret; 358 } 359 360 int tls13_process_certificate_verify(SSL_HANDSHAKE *hs) { 361 SSL *const ssl = hs->ssl; 362 int ret = 0; 363 uint8_t *msg = NULL; 364 size_t msg_len; 365 366 if (hs->peer_pubkey == NULL) { 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 } 386 hs->new_session->peer_signature_algorithm = signature_algorithm; 387 388 if (!tls13_get_cert_verify_signature_input( 389 hs, &msg, &msg_len, 390 ssl->server ? ssl_cert_verify_client : ssl_cert_verify_server)) { 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), 397 signature_algorithm, hs->peer_pubkey, msg, msg_len); 398 #if defined(BORINGSSL_UNSAFE_FUZZER_MODE) 399 sig_ok = 1; 400 ERR_clear_error(); 401 #endif 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: 411 OPENSSL_free(msg); 412 return ret; 413 } 414 415 int tls13_process_finished(SSL_HANDSHAKE *hs, int use_saved_value) { 416 SSL *const ssl = hs->ssl; 417 uint8_t verify_data_buf[EVP_MAX_MD_SIZE]; 418 const uint8_t *verify_data; 419 size_t verify_data_len; 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; 430 } 431 432 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) { 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 } 446 447 int tls13_add_certificate(SSL_HANDSHAKE *hs) { 448 SSL *const ssl = hs->ssl; 449 CBB cbb, body, certificate_list; 450 if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_CERTIFICATE) || 451 /* The request context is always empty in the handshake. */ 452 !CBB_add_u8(&body, 0) || 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)) { 459 if (!ssl_add_message_cbb(ssl, &cbb)) { 460 goto err; 461 } 462 463 return 1; 464 } 465 466 CERT *cert = ssl->cert; 467 CRYPTO_BUFFER *leaf_buf = sk_CRYPTO_BUFFER_value(cert->chain, 0); 468 CBB leaf, extensions; 469 if (!CBB_add_u24_length_prefixed(&certificate_list, &leaf) || 470 !CBB_add_bytes(&leaf, CRYPTO_BUFFER_data(leaf_buf), 471 CRYPTO_BUFFER_len(leaf_buf)) || 472 !CBB_add_u16_length_prefixed(&certificate_list, &extensions)) { 473 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); 474 goto err; 475 } 476 477 if (hs->scts_requested && ssl->cert->signed_cert_timestamp_list != NULL) { 478 CBB contents; 479 if (!CBB_add_u16(&extensions, TLSEXT_TYPE_certificate_timestamp) || 480 !CBB_add_u16_length_prefixed(&extensions, &contents) || 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)) || 485 !CBB_flush(&extensions)) { 486 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); 487 goto err; 488 } 489 } 490 491 if (hs->ocsp_stapling_requested && 492 ssl->cert->ocsp_response != NULL) { 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) || 498 !CBB_add_bytes(&ocsp_response, 499 CRYPTO_BUFFER_data(ssl->cert->ocsp_response), 500 CRYPTO_BUFFER_len(ssl->cert->ocsp_response)) || 501 !CBB_flush(&extensions)) { 502 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); 503 goto err; 504 } 505 } 506 507 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); 509 CBB child; 510 if (!CBB_add_u24_length_prefixed(&certificate_list, &child) || 511 !CBB_add_bytes(&child, CRYPTO_BUFFER_data(cert_buf), 512 CRYPTO_BUFFER_len(cert_buf)) || 513 !CBB_add_u16(&certificate_list, 0 /* no extensions */)) { 514 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); 515 goto err; 516 } 517 } 518 519 if (!ssl_add_message_cbb(ssl, &cbb)) { 520 goto err; 521 } 522 523 return 1; 524 525 err: 526 CBB_cleanup(&cbb); 527 return 0; 528 } 529 530 enum ssl_private_key_result_t tls13_add_certificate_verify(SSL_HANDSHAKE *hs, 531 int is_first_run) { 532 SSL *const ssl = hs->ssl; 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; 540 if (!tls1_choose_signature_algorithm(hs, &signature_algorithm)) { 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; 552 const size_t max_sig_len = ssl_private_key_max_signature_len(ssl); 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) { 563 if (!tls13_get_cert_verify_signature_input( 564 hs, &msg, &msg_len, 565 ssl->server ? ssl_cert_verify_server : ssl_cert_verify_client)) { 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) || 581 !ssl_add_message_cbb(ssl, &cbb)) { 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 } 592 593 int tls13_add_finished(SSL_HANDSHAKE *hs) { 594 SSL *const ssl = hs->ssl; 595 size_t verify_data_len; 596 uint8_t verify_data[EVP_MAX_MD_SIZE]; 597 598 if (!tls13_finished_mac(hs, verify_data, &verify_data_len, ssl->server)) { 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) || 607 !ssl_add_message_cbb(ssl, &cbb)) { 608 CBB_cleanup(&cbb); 609 return 0; 610 } 611 612 return 1; 613 } 614 615 static int tls13_receive_key_update(SSL *ssl) { 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)) { 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 } 627 628 /* TODO(svaldez): Send KeyUpdate if |key_update_request| is 629 * |SSL_KEY_UPDATE_REQUESTED|. */ 630 return tls13_rotate_traffic_key(ssl, evp_aead_open); 631 } 632 633 int tls13_post_handshake(SSL *ssl) { 634 if (ssl->s3->tmp.message_type == SSL3_MT_KEY_UPDATE) { 635 ssl->s3->key_update_count++; 636 if (ssl->s3->key_update_count > kMaxKeyUpdates) { 637 OPENSSL_PUT_ERROR(SSL, SSL_R_TOO_MANY_KEY_UPDATES); 638 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 639 return 0; 640 } 641 642 return tls13_receive_key_update(ssl); 643 } 644 645 ssl->s3->key_update_count = 0; 646 647 if (ssl->s3->tmp.message_type == SSL3_MT_NEW_SESSION_TICKET && 648 !ssl->server) { 649 return tls13_process_new_session_ticket(ssl); 650 } 651 652 // TODO(svaldez): Handle post-handshake authentication. 653 654 ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 655 OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE); 656 return 0; 657 } 658
