1 /* $OpenBSD: ssl_clnt.c,v 1.83 2021/02/20 14:16:56 tb Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 /* ==================================================================== 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 /* ==================================================================== 112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 113 * 114 * Portions of the attached software ("Contribution") are developed by 115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 116 * 117 * The Contribution is licensed pursuant to the OpenSSL open source 118 * license provided above. 119 * 120 * ECC cipher suite support in OpenSSL originally written by 121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. 122 * 123 */ 124 /* ==================================================================== 125 * Copyright 2005 Nokia. All rights reserved. 126 * 127 * The portions of the attached software ("Contribution") is developed by 128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 129 * license. 130 * 131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 133 * support (see RFC 4279) to OpenSSL. 134 * 135 * No patent licenses or other rights except those expressly stated in 136 * the OpenSSL open source license shall be deemed granted or received 137 * expressly, by implication, estoppel, or otherwise. 138 * 139 * No assurances are provided by Nokia that the Contribution does not 140 * infringe the patent or other intellectual property rights of any third 141 * party or that the license provides you with all the necessary rights 142 * to make use of the Contribution. 143 * 144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 148 * OTHERWISE. 149 */ 150 151 #include <limits.h> 152 #include <stdint.h> 153 #include <stdio.h> 154 155 #include "ssl_locl.h" 156 157 #include <openssl/bn.h> 158 #include <openssl/buffer.h> 159 #include <openssl/curve25519.h> 160 #include <openssl/dh.h> 161 #include <openssl/evp.h> 162 #include <openssl/md5.h> 163 #include <openssl/objects.h> 164 165 #ifndef OPENSSL_NO_ENGINE 166 #include <openssl/engine.h> 167 #endif 168 #ifndef OPENSSL_NO_GOST 169 #include <openssl/gost.h> 170 #endif 171 172 #include "bytestring.h" 173 #include "ssl_sigalgs.h" 174 #include "ssl_tlsext.h" 175 176 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b); 177 178 int 179 ssl3_connect(SSL *s) 180 { 181 void (*cb)(const SSL *ssl, int type, int val) = NULL; 182 int ret = -1; 183 int new_state, state, skip = 0; 184 185 ERR_clear_error(); 186 errno = 0; 187 188 if (s->internal->info_callback != NULL) 189 cb = s->internal->info_callback; 190 else if (s->ctx->internal->info_callback != NULL) 191 cb = s->ctx->internal->info_callback; 192 193 s->internal->in_handshake++; 194 if (!SSL_in_init(s) || SSL_in_before(s)) 195 SSL_clear(s); 196 197 for (;;) { 198 state = S3I(s)->hs.state; 199 200 switch (S3I(s)->hs.state) { 201 case SSL_ST_RENEGOTIATE: 202 s->internal->renegotiate = 1; 203 S3I(s)->hs.state = SSL_ST_CONNECT; 204 s->ctx->internal->stats.sess_connect_renegotiate++; 205 /* break */ 206 case SSL_ST_BEFORE: 207 case SSL_ST_CONNECT: 208 case SSL_ST_BEFORE|SSL_ST_CONNECT: 209 case SSL_ST_OK|SSL_ST_CONNECT: 210 211 s->server = 0; 212 if (cb != NULL) 213 cb(s, SSL_CB_HANDSHAKE_START, 1); 214 215 if (!ssl_legacy_stack_version(s, s->version)) { 216 SSLerror(s, ERR_R_INTERNAL_ERROR); 217 ret = -1; 218 goto end; 219 } 220 221 /* s->version=SSL3_VERSION; */ 222 s->internal->type = SSL_ST_CONNECT; 223 224 if (!ssl3_setup_init_buffer(s)) { 225 ret = -1; 226 goto end; 227 } 228 if (!ssl3_setup_buffers(s)) { 229 ret = -1; 230 goto end; 231 } 232 if (!ssl_init_wbio_buffer(s, 0)) { 233 ret = -1; 234 goto end; 235 } 236 237 /* don't push the buffering BIO quite yet */ 238 239 if (!tls1_transcript_init(s)) { 240 ret = -1; 241 goto end; 242 } 243 244 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 245 s->ctx->internal->stats.sess_connect++; 246 s->internal->init_num = 0; 247 248 if (SSL_is_dtls(s)) { 249 /* mark client_random uninitialized */ 250 memset(s->s3->client_random, 0, 251 sizeof(s->s3->client_random)); 252 D1I(s)->send_cookie = 0; 253 s->internal->hit = 0; 254 } 255 break; 256 257 case SSL3_ST_CW_CLNT_HELLO_A: 258 case SSL3_ST_CW_CLNT_HELLO_B: 259 s->internal->shutdown = 0; 260 261 if (SSL_is_dtls(s)) { 262 /* every DTLS ClientHello resets Finished MAC */ 263 tls1_transcript_reset(s); 264 265 dtls1_start_timer(s); 266 } 267 268 ret = ssl3_send_client_hello(s); 269 if (ret <= 0) 270 goto end; 271 272 if (SSL_is_dtls(s) && D1I(s)->send_cookie) { 273 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 274 S3I(s)->hs.next_state = SSL3_ST_CR_SRVR_HELLO_A; 275 } else 276 S3I(s)->hs.state = SSL3_ST_CR_SRVR_HELLO_A; 277 278 s->internal->init_num = 0; 279 280 /* turn on buffering for the next lot of output */ 281 if (s->bbio != s->wbio) 282 s->wbio = BIO_push(s->bbio, s->wbio); 283 284 break; 285 286 case SSL3_ST_CR_SRVR_HELLO_A: 287 case SSL3_ST_CR_SRVR_HELLO_B: 288 ret = ssl3_get_server_hello(s); 289 if (ret <= 0) 290 goto end; 291 292 if (s->internal->hit) { 293 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 294 if (!SSL_is_dtls(s)) { 295 if (s->internal->tlsext_ticket_expected) { 296 /* receive renewed session ticket */ 297 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 298 } 299 300 /* No client certificate verification. */ 301 tls1_transcript_free(s); 302 } 303 } else if (SSL_is_dtls(s)) { 304 S3I(s)->hs.state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 305 } else { 306 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 307 } 308 s->internal->init_num = 0; 309 break; 310 311 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 312 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 313 ret = ssl3_get_dtls_hello_verify(s); 314 if (ret <= 0) 315 goto end; 316 dtls1_stop_timer(s); 317 if (D1I(s)->send_cookie) /* start again, with a cookie */ 318 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 319 else 320 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 321 s->internal->init_num = 0; 322 break; 323 324 case SSL3_ST_CR_CERT_A: 325 case SSL3_ST_CR_CERT_B: 326 ret = ssl3_check_finished(s); 327 if (ret <= 0) 328 goto end; 329 if (ret == 2) { 330 s->internal->hit = 1; 331 if (s->internal->tlsext_ticket_expected) 332 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 333 else 334 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 335 s->internal->init_num = 0; 336 break; 337 } 338 /* Check if it is anon DH/ECDH. */ 339 if (!(S3I(s)->hs.new_cipher->algorithm_auth & 340 SSL_aNULL)) { 341 ret = ssl3_get_server_certificate(s); 342 if (ret <= 0) 343 goto end; 344 if (s->internal->tlsext_status_expected) 345 S3I(s)->hs.state = SSL3_ST_CR_CERT_STATUS_A; 346 else 347 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 348 } else { 349 skip = 1; 350 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 351 } 352 s->internal->init_num = 0; 353 break; 354 355 case SSL3_ST_CR_KEY_EXCH_A: 356 case SSL3_ST_CR_KEY_EXCH_B: 357 ret = ssl3_get_server_key_exchange(s); 358 if (ret <= 0) 359 goto end; 360 S3I(s)->hs.state = SSL3_ST_CR_CERT_REQ_A; 361 s->internal->init_num = 0; 362 363 /* 364 * At this point we check that we have the 365 * required stuff from the server. 366 */ 367 if (!ssl3_check_cert_and_algorithm(s)) { 368 ret = -1; 369 goto end; 370 } 371 break; 372 373 case SSL3_ST_CR_CERT_REQ_A: 374 case SSL3_ST_CR_CERT_REQ_B: 375 ret = ssl3_get_certificate_request(s); 376 if (ret <= 0) 377 goto end; 378 S3I(s)->hs.state = SSL3_ST_CR_SRVR_DONE_A; 379 s->internal->init_num = 0; 380 break; 381 382 case SSL3_ST_CR_SRVR_DONE_A: 383 case SSL3_ST_CR_SRVR_DONE_B: 384 ret = ssl3_get_server_done(s); 385 if (ret <= 0) 386 goto end; 387 if (SSL_is_dtls(s)) 388 dtls1_stop_timer(s); 389 if (S3I(s)->tmp.cert_req) 390 S3I(s)->hs.state = SSL3_ST_CW_CERT_A; 391 else 392 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 393 s->internal->init_num = 0; 394 395 break; 396 397 case SSL3_ST_CW_CERT_A: 398 case SSL3_ST_CW_CERT_B: 399 case SSL3_ST_CW_CERT_C: 400 case SSL3_ST_CW_CERT_D: 401 if (SSL_is_dtls(s)) 402 dtls1_start_timer(s); 403 ret = ssl3_send_client_certificate(s); 404 if (ret <= 0) 405 goto end; 406 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 407 s->internal->init_num = 0; 408 break; 409 410 case SSL3_ST_CW_KEY_EXCH_A: 411 case SSL3_ST_CW_KEY_EXCH_B: 412 if (SSL_is_dtls(s)) 413 dtls1_start_timer(s); 414 ret = ssl3_send_client_key_exchange(s); 415 if (ret <= 0) 416 goto end; 417 /* 418 * EAY EAY EAY need to check for DH fix cert 419 * sent back 420 */ 421 /* 422 * For TLS, cert_req is set to 2, so a cert chain 423 * of nothing is sent, but no verify packet is sent 424 */ 425 /* 426 * XXX: For now, we do not support client 427 * authentication in ECDH cipher suites with 428 * ECDH (rather than ECDSA) certificates. 429 * We need to skip the certificate verify 430 * message when client's ECDH public key is sent 431 * inside the client certificate. 432 */ 433 if (S3I(s)->tmp.cert_req == 1) { 434 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_A; 435 } else { 436 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 437 S3I(s)->change_cipher_spec = 0; 438 } 439 if (!SSL_is_dtls(s)) { 440 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 441 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 442 S3I(s)->change_cipher_spec = 0; 443 } 444 } 445 446 s->internal->init_num = 0; 447 break; 448 449 case SSL3_ST_CW_CERT_VRFY_A: 450 case SSL3_ST_CW_CERT_VRFY_B: 451 if (SSL_is_dtls(s)) 452 dtls1_start_timer(s); 453 ret = ssl3_send_client_verify(s); 454 if (ret <= 0) 455 goto end; 456 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 457 s->internal->init_num = 0; 458 S3I(s)->change_cipher_spec = 0; 459 break; 460 461 case SSL3_ST_CW_CHANGE_A: 462 case SSL3_ST_CW_CHANGE_B: 463 if (SSL_is_dtls(s) && !s->internal->hit) 464 dtls1_start_timer(s); 465 ret = ssl3_send_change_cipher_spec(s, 466 SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B); 467 if (ret <= 0) 468 goto end; 469 470 S3I(s)->hs.state = SSL3_ST_CW_FINISHED_A; 471 s->internal->init_num = 0; 472 473 s->session->cipher = S3I(s)->hs.new_cipher; 474 if (!tls1_setup_key_block(s)) { 475 ret = -1; 476 goto end; 477 } 478 479 if (!tls1_change_cipher_state(s, 480 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) { 481 ret = -1; 482 goto end; 483 } 484 485 if (SSL_is_dtls(s)) 486 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 487 488 break; 489 490 case SSL3_ST_CW_FINISHED_A: 491 case SSL3_ST_CW_FINISHED_B: 492 if (SSL_is_dtls(s) && !s->internal->hit) 493 dtls1_start_timer(s); 494 ret = ssl3_send_finished(s, SSL3_ST_CW_FINISHED_A, 495 SSL3_ST_CW_FINISHED_B, TLS_MD_CLIENT_FINISH_CONST, 496 TLS_MD_CLIENT_FINISH_CONST_SIZE); 497 if (ret <= 0) 498 goto end; 499 if (!SSL_is_dtls(s)) 500 s->s3->flags |= SSL3_FLAGS_CCS_OK; 501 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 502 503 /* clear flags */ 504 if (s->internal->hit) { 505 S3I(s)->hs.next_state = SSL_ST_OK; 506 } else { 507 /* Allow NewSessionTicket if ticket expected */ 508 if (s->internal->tlsext_ticket_expected) 509 S3I(s)->hs.next_state = 510 SSL3_ST_CR_SESSION_TICKET_A; 511 else 512 S3I(s)->hs.next_state = 513 SSL3_ST_CR_FINISHED_A; 514 } 515 s->internal->init_num = 0; 516 break; 517 518 case SSL3_ST_CR_SESSION_TICKET_A: 519 case SSL3_ST_CR_SESSION_TICKET_B: 520 ret = ssl3_get_new_session_ticket(s); 521 if (ret <= 0) 522 goto end; 523 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 524 s->internal->init_num = 0; 525 break; 526 527 case SSL3_ST_CR_CERT_STATUS_A: 528 case SSL3_ST_CR_CERT_STATUS_B: 529 ret = ssl3_get_cert_status(s); 530 if (ret <= 0) 531 goto end; 532 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 533 s->internal->init_num = 0; 534 break; 535 536 case SSL3_ST_CR_FINISHED_A: 537 case SSL3_ST_CR_FINISHED_B: 538 if (SSL_is_dtls(s)) 539 D1I(s)->change_cipher_spec_ok = 1; 540 else 541 s->s3->flags |= SSL3_FLAGS_CCS_OK; 542 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 543 SSL3_ST_CR_FINISHED_B); 544 if (ret <= 0) 545 goto end; 546 if (SSL_is_dtls(s)) 547 dtls1_stop_timer(s); 548 549 if (s->internal->hit) 550 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 551 else 552 S3I(s)->hs.state = SSL_ST_OK; 553 s->internal->init_num = 0; 554 break; 555 556 case SSL3_ST_CW_FLUSH: 557 s->internal->rwstate = SSL_WRITING; 558 if (BIO_flush(s->wbio) <= 0) { 559 if (SSL_is_dtls(s)) { 560 /* If the write error was fatal, stop trying */ 561 if (!BIO_should_retry(s->wbio)) { 562 s->internal->rwstate = SSL_NOTHING; 563 S3I(s)->hs.state = S3I(s)->hs.next_state; 564 } 565 } 566 ret = -1; 567 goto end; 568 } 569 s->internal->rwstate = SSL_NOTHING; 570 S3I(s)->hs.state = S3I(s)->hs.next_state; 571 break; 572 573 case SSL_ST_OK: 574 /* clean a few things up */ 575 tls1_cleanup_key_block(s); 576 577 if (S3I(s)->handshake_transcript != NULL) { 578 SSLerror(s, ERR_R_INTERNAL_ERROR); 579 ret = -1; 580 goto end; 581 } 582 583 if (!SSL_is_dtls(s)) 584 ssl3_release_init_buffer(s); 585 586 ssl_free_wbio_buffer(s); 587 588 s->internal->init_num = 0; 589 s->internal->renegotiate = 0; 590 s->internal->new_session = 0; 591 592 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 593 if (s->internal->hit) 594 s->ctx->internal->stats.sess_hit++; 595 596 ret = 1; 597 /* s->server=0; */ 598 s->internal->handshake_func = ssl3_connect; 599 s->ctx->internal->stats.sess_connect_good++; 600 601 if (cb != NULL) 602 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 603 604 if (SSL_is_dtls(s)) { 605 /* done with handshaking */ 606 D1I(s)->handshake_read_seq = 0; 607 D1I(s)->next_handshake_write_seq = 0; 608 } 609 610 goto end; 611 /* break; */ 612 613 default: 614 SSLerror(s, SSL_R_UNKNOWN_STATE); 615 ret = -1; 616 goto end; 617 /* break; */ 618 } 619 620 /* did we do anything */ 621 if (!S3I(s)->tmp.reuse_message && !skip) { 622 if (s->internal->debug) { 623 if ((ret = BIO_flush(s->wbio)) <= 0) 624 goto end; 625 } 626 627 if ((cb != NULL) && (S3I(s)->hs.state != state)) { 628 new_state = S3I(s)->hs.state; 629 S3I(s)->hs.state = state; 630 cb(s, SSL_CB_CONNECT_LOOP, 1); 631 S3I(s)->hs.state = new_state; 632 } 633 } 634 skip = 0; 635 } 636 637 end: 638 s->internal->in_handshake--; 639 if (cb != NULL) 640 cb(s, SSL_CB_CONNECT_EXIT, ret); 641 642 return (ret); 643 } 644 645 int 646 ssl3_send_client_hello(SSL *s) 647 { 648 CBB cbb, client_hello, session_id, cookie, cipher_suites; 649 CBB compression_methods; 650 uint16_t max_version; 651 size_t sl; 652 653 memset(&cbb, 0, sizeof(cbb)); 654 655 if (S3I(s)->hs.state == SSL3_ST_CW_CLNT_HELLO_A) { 656 SSL_SESSION *sess = s->session; 657 658 if (ssl_supported_version_range(s, NULL, &max_version) != 1) { 659 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 660 return (-1); 661 } 662 s->client_version = s->version = max_version; 663 664 if (sess == NULL || 665 sess->ssl_version != s->version || 666 (!sess->session_id_length && !sess->tlsext_tick) || 667 sess->internal->not_resumable) { 668 if (!ssl_get_new_session(s, 0)) 669 goto err; 670 } 671 /* else use the pre-loaded session */ 672 673 /* 674 * If a DTLS ClientHello message is being resent after a 675 * HelloVerifyRequest, we must retain the original client 676 * random value. 677 */ 678 if (!SSL_is_dtls(s) || D1I(s)->send_cookie == 0) 679 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE); 680 681 if (!ssl3_handshake_msg_start(s, &cbb, &client_hello, 682 SSL3_MT_CLIENT_HELLO)) 683 goto err; 684 685 /* 686 * Version indicates the negotiated version: for example from 687 * an SSLv2/v3 compatible client hello). The client_version 688 * field is the maximum version we permit and it is also 689 * used in RSA encrypted premaster secrets. Some servers can 690 * choke if we initially report a higher version then 691 * renegotiate to a lower one in the premaster secret. This 692 * didn't happen with TLS 1.0 as most servers supported it 693 * but it can with TLS 1.1 or later if the server only supports 694 * 1.0. 695 * 696 * Possible scenario with previous logic: 697 * 1. Client hello indicates TLS 1.2 698 * 2. Server hello says TLS 1.0 699 * 3. RSA encrypted premaster secret uses 1.2. 700 * 4. Handhaked proceeds using TLS 1.0. 701 * 5. Server sends hello request to renegotiate. 702 * 6. Client hello indicates TLS v1.0 as we now 703 * know that is maximum server supports. 704 * 7. Server chokes on RSA encrypted premaster secret 705 * containing version 1.0. 706 * 707 * For interoperability it should be OK to always use the 708 * maximum version we support in client hello and then rely 709 * on the checking of version to ensure the servers isn't 710 * being inconsistent: for example initially negotiating with 711 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using 712 * client_version in client hello and not resetting it to 713 * the negotiated version. 714 */ 715 if (!CBB_add_u16(&client_hello, s->client_version)) 716 goto err; 717 718 /* Random stuff */ 719 if (!CBB_add_bytes(&client_hello, s->s3->client_random, 720 sizeof(s->s3->client_random))) 721 goto err; 722 723 /* Session ID */ 724 if (!CBB_add_u8_length_prefixed(&client_hello, &session_id)) 725 goto err; 726 if (!s->internal->new_session && 727 s->session->session_id_length > 0) { 728 sl = s->session->session_id_length; 729 if (sl > sizeof(s->session->session_id)) { 730 SSLerror(s, ERR_R_INTERNAL_ERROR); 731 goto err; 732 } 733 if (!CBB_add_bytes(&session_id, 734 s->session->session_id, sl)) 735 goto err; 736 } 737 738 /* DTLS Cookie. */ 739 if (SSL_is_dtls(s)) { 740 if (D1I(s)->cookie_len > sizeof(D1I(s)->cookie)) { 741 SSLerror(s, ERR_R_INTERNAL_ERROR); 742 goto err; 743 } 744 if (!CBB_add_u8_length_prefixed(&client_hello, &cookie)) 745 goto err; 746 if (!CBB_add_bytes(&cookie, D1I(s)->cookie, 747 D1I(s)->cookie_len)) 748 goto err; 749 } 750 751 /* Ciphers supported */ 752 if (!CBB_add_u16_length_prefixed(&client_hello, &cipher_suites)) 753 return 0; 754 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), 755 &cipher_suites)) { 756 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE); 757 goto err; 758 } 759 760 /* Add in compression methods (null) */ 761 if (!CBB_add_u8_length_prefixed(&client_hello, 762 &compression_methods)) 763 goto err; 764 if (!CBB_add_u8(&compression_methods, 0)) 765 goto err; 766 767 /* TLS extensions */ 768 if (!tlsext_client_build(s, SSL_TLSEXT_MSG_CH, &client_hello)) { 769 SSLerror(s, ERR_R_INTERNAL_ERROR); 770 goto err; 771 } 772 773 if (!ssl3_handshake_msg_finish(s, &cbb)) 774 goto err; 775 776 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_B; 777 } 778 779 /* SSL3_ST_CW_CLNT_HELLO_B */ 780 return (ssl3_handshake_write(s)); 781 782 err: 783 CBB_cleanup(&cbb); 784 785 return (-1); 786 } 787 788 int 789 ssl3_get_dtls_hello_verify(SSL *s) 790 { 791 long n; 792 int al, ok = 0; 793 size_t cookie_len; 794 uint16_t ssl_version; 795 CBS hello_verify_request, cookie; 796 797 n = ssl3_get_message(s, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 798 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, s->internal->max_cert_list, &ok); 799 if (!ok) 800 return ((int)n); 801 802 if (S3I(s)->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 803 D1I(s)->send_cookie = 0; 804 S3I(s)->tmp.reuse_message = 1; 805 return (1); 806 } 807 808 if (n < 0) 809 goto decode_err; 810 811 CBS_init(&hello_verify_request, s->internal->init_msg, n); 812 813 if (!CBS_get_u16(&hello_verify_request, &ssl_version)) 814 goto decode_err; 815 if (!CBS_get_u8_length_prefixed(&hello_verify_request, &cookie)) 816 goto decode_err; 817 if (CBS_len(&hello_verify_request) != 0) 818 goto decode_err; 819 820 /* 821 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should always 822 * contain DTLSv1.0 the version that is going to be negotiated. 823 * Tolerate DTLSv1.2 just in case. 824 */ 825 if (ssl_version != DTLS1_VERSION && ssl_version != DTLS1_2_VERSION) { 826 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 827 s->version = (s->version & 0xff00) | (ssl_version & 0xff); 828 al = SSL_AD_PROTOCOL_VERSION; 829 goto fatal_err; 830 } 831 832 if (!CBS_write_bytes(&cookie, D1I(s)->cookie, 833 sizeof(D1I(s)->cookie), &cookie_len)) { 834 D1I(s)->cookie_len = 0; 835 al = SSL_AD_ILLEGAL_PARAMETER; 836 goto fatal_err; 837 } 838 D1I(s)->cookie_len = cookie_len; 839 D1I(s)->send_cookie = 1; 840 841 return 1; 842 843 decode_err: 844 al = SSL_AD_DECODE_ERROR; 845 fatal_err: 846 ssl3_send_alert(s, SSL3_AL_FATAL, al); 847 return -1; 848 } 849 850 int 851 ssl3_get_server_hello(SSL *s) 852 { 853 CBS cbs, server_random, session_id; 854 uint16_t server_version, cipher_suite; 855 uint16_t min_version, max_version; 856 uint8_t compression_method; 857 const SSL_CIPHER *cipher; 858 const SSL_METHOD *method; 859 unsigned long alg_k; 860 size_t outlen; 861 int al, ok; 862 long n; 863 864 s->internal->first_packet = 1; 865 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 866 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, /* ?? */ &ok); 867 if (!ok) 868 return ((int)n); 869 s->internal->first_packet = 0; 870 871 if (n < 0) 872 goto decode_err; 873 874 CBS_init(&cbs, s->internal->init_msg, n); 875 876 if (SSL_is_dtls(s)) { 877 if (S3I(s)->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 878 if (D1I(s)->send_cookie == 0) { 879 S3I(s)->tmp.reuse_message = 1; 880 return (1); 881 } else { 882 /* Already sent a cookie. */ 883 al = SSL_AD_UNEXPECTED_MESSAGE; 884 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 885 goto fatal_err; 886 } 887 } 888 } 889 890 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_HELLO) { 891 al = SSL_AD_UNEXPECTED_MESSAGE; 892 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 893 goto fatal_err; 894 } 895 896 if (!CBS_get_u16(&cbs, &server_version)) 897 goto decode_err; 898 899 if (ssl_supported_version_range(s, &min_version, &max_version) != 1) { 900 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 901 goto err; 902 } 903 904 if (server_version < min_version || server_version > max_version) { 905 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 906 s->version = (s->version & 0xff00) | (server_version & 0xff); 907 al = SSL_AD_PROTOCOL_VERSION; 908 goto fatal_err; 909 } 910 s->version = server_version; 911 912 if ((method = ssl_get_method(server_version)) == NULL) { 913 SSLerror(s, ERR_R_INTERNAL_ERROR); 914 goto err; 915 } 916 s->method = method; 917 918 /* Server random. */ 919 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 920 goto decode_err; 921 if (!CBS_write_bytes(&server_random, s->s3->server_random, 922 sizeof(s->s3->server_random), NULL)) 923 goto err; 924 925 if (!ssl_downgrade_max_version(s, &max_version)) 926 goto err; 927 if (!SSL_is_dtls(s) && max_version >= TLS1_2_VERSION && 928 s->version < max_version) { 929 /* 930 * RFC 8446 section 4.1.3. We must not downgrade if the server 931 * random value contains the TLS 1.2 or TLS 1.1 magical value. 932 */ 933 if (!CBS_skip(&server_random, 934 CBS_len(&server_random) - sizeof(tls13_downgrade_12))) 935 goto err; 936 if (s->version == TLS1_2_VERSION && 937 CBS_mem_equal(&server_random, tls13_downgrade_12, 938 sizeof(tls13_downgrade_12))) { 939 al = SSL_AD_ILLEGAL_PARAMETER; 940 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 941 goto fatal_err; 942 } 943 if (CBS_mem_equal(&server_random, tls13_downgrade_11, 944 sizeof(tls13_downgrade_11))) { 945 al = SSL_AD_ILLEGAL_PARAMETER; 946 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 947 goto fatal_err; 948 } 949 } 950 951 /* Session ID. */ 952 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 953 goto decode_err; 954 955 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 956 al = SSL_AD_ILLEGAL_PARAMETER; 957 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 958 goto fatal_err; 959 } 960 961 /* Cipher suite. */ 962 if (!CBS_get_u16(&cbs, &cipher_suite)) 963 goto decode_err; 964 965 /* 966 * Check if we want to resume the session based on external 967 * pre-shared secret. 968 */ 969 if (s->internal->tls_session_secret_cb) { 970 SSL_CIPHER *pref_cipher = NULL; 971 s->session->master_key_length = sizeof(s->session->master_key); 972 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 973 &s->session->master_key_length, NULL, &pref_cipher, 974 s->internal->tls_session_secret_cb_arg)) { 975 s->session->cipher = pref_cipher ? pref_cipher : 976 ssl3_get_cipher_by_value(cipher_suite); 977 s->s3->flags |= SSL3_FLAGS_CCS_OK; 978 } 979 } 980 981 if (s->session->session_id_length != 0 && 982 CBS_mem_equal(&session_id, s->session->session_id, 983 s->session->session_id_length)) { 984 if (s->sid_ctx_length != s->session->sid_ctx_length || 985 timingsafe_memcmp(s->session->sid_ctx, 986 s->sid_ctx, s->sid_ctx_length) != 0) { 987 /* actually a client application bug */ 988 al = SSL_AD_ILLEGAL_PARAMETER; 989 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 990 goto fatal_err; 991 } 992 s->s3->flags |= SSL3_FLAGS_CCS_OK; 993 s->internal->hit = 1; 994 } else { 995 /* a miss or crap from the other end */ 996 997 /* If we were trying for session-id reuse, make a new 998 * SSL_SESSION so we don't stuff up other people */ 999 s->internal->hit = 0; 1000 if (s->session->session_id_length > 0) { 1001 if (!ssl_get_new_session(s, 0)) { 1002 al = SSL_AD_INTERNAL_ERROR; 1003 goto fatal_err; 1004 } 1005 } 1006 1007 /* 1008 * XXX - improve the handling for the case where there is a 1009 * zero length session identifier. 1010 */ 1011 if (!CBS_write_bytes(&session_id, s->session->session_id, 1012 sizeof(s->session->session_id), &outlen)) 1013 goto err; 1014 s->session->session_id_length = outlen; 1015 1016 s->session->ssl_version = s->version; 1017 } 1018 1019 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 1020 al = SSL_AD_ILLEGAL_PARAMETER; 1021 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 1022 goto fatal_err; 1023 } 1024 1025 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 1026 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 1027 (TLS1_get_version(s) < TLS1_2_VERSION)) { 1028 al = SSL_AD_ILLEGAL_PARAMETER; 1029 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1030 goto fatal_err; 1031 } 1032 1033 if (!ssl_cipher_in_list(SSL_get_ciphers(s), cipher)) { 1034 /* we did not say we would use this cipher */ 1035 al = SSL_AD_ILLEGAL_PARAMETER; 1036 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1037 goto fatal_err; 1038 } 1039 1040 /* 1041 * Depending on the session caching (internal/external), the cipher 1042 * and/or cipher_id values may not be set. Make sure that 1043 * cipher_id is set and use it for comparison. 1044 */ 1045 if (s->session->cipher) 1046 s->session->cipher_id = s->session->cipher->id; 1047 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 1048 al = SSL_AD_ILLEGAL_PARAMETER; 1049 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1050 goto fatal_err; 1051 } 1052 S3I(s)->hs.new_cipher = cipher; 1053 1054 if (!tls1_transcript_hash_init(s)) 1055 goto err; 1056 1057 /* 1058 * Don't digest cached records if no sigalgs: we may need them for 1059 * client authentication. 1060 */ 1061 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1062 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST))) 1063 tls1_transcript_free(s); 1064 1065 if (!CBS_get_u8(&cbs, &compression_method)) 1066 goto decode_err; 1067 1068 if (compression_method != 0) { 1069 al = SSL_AD_ILLEGAL_PARAMETER; 1070 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1071 goto fatal_err; 1072 } 1073 1074 if (!tlsext_client_parse(s, SSL_TLSEXT_MSG_SH, &cbs, &al)) { 1075 SSLerror(s, SSL_R_PARSE_TLSEXT); 1076 goto fatal_err; 1077 } 1078 1079 /* 1080 * Determine if we need to see RI. Strictly speaking if we want to 1081 * avoid an attack we should *always* see RI even on initial server 1082 * hello because the client doesn't see any renegotiation during an 1083 * attack. However this would mean we could not connect to any server 1084 * which doesn't support RI so for the immediate future tolerate RI 1085 * absence on initial connect only. 1086 */ 1087 if (!S3I(s)->renegotiate_seen && 1088 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1089 al = SSL_AD_HANDSHAKE_FAILURE; 1090 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1091 goto fatal_err; 1092 } 1093 1094 if (ssl_check_serverhello_tlsext(s) <= 0) { 1095 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1096 goto err; 1097 } 1098 1099 return (1); 1100 1101 decode_err: 1102 /* wrong packet length */ 1103 al = SSL_AD_DECODE_ERROR; 1104 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1105 fatal_err: 1106 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1107 err: 1108 return (-1); 1109 } 1110 1111 int 1112 ssl3_get_server_certificate(SSL *s) 1113 { 1114 int al, i, ok, ret = -1; 1115 long n; 1116 CBS cbs, cert_list; 1117 X509 *x = NULL; 1118 const unsigned char *q; 1119 STACK_OF(X509) *sk = NULL; 1120 SESS_CERT *sc; 1121 EVP_PKEY *pkey = NULL; 1122 1123 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1124 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 1125 if (!ok) 1126 return ((int)n); 1127 1128 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1129 S3I(s)->tmp.reuse_message = 1; 1130 return (1); 1131 } 1132 1133 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 1134 al = SSL_AD_UNEXPECTED_MESSAGE; 1135 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1136 goto fatal_err; 1137 } 1138 1139 1140 if ((sk = sk_X509_new_null()) == NULL) { 1141 SSLerror(s, ERR_R_MALLOC_FAILURE); 1142 goto err; 1143 } 1144 1145 if (n < 0) 1146 goto decode_err; 1147 1148 CBS_init(&cbs, s->internal->init_msg, n); 1149 if (CBS_len(&cbs) < 3) 1150 goto decode_err; 1151 1152 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1153 CBS_len(&cbs) != 0) { 1154 al = SSL_AD_DECODE_ERROR; 1155 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1156 goto fatal_err; 1157 } 1158 1159 while (CBS_len(&cert_list) > 0) { 1160 CBS cert; 1161 1162 if (CBS_len(&cert_list) < 3) 1163 goto decode_err; 1164 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1165 al = SSL_AD_DECODE_ERROR; 1166 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1167 goto fatal_err; 1168 } 1169 1170 q = CBS_data(&cert); 1171 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1172 if (x == NULL) { 1173 al = SSL_AD_BAD_CERTIFICATE; 1174 SSLerror(s, ERR_R_ASN1_LIB); 1175 goto fatal_err; 1176 } 1177 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1178 al = SSL_AD_DECODE_ERROR; 1179 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1180 goto fatal_err; 1181 } 1182 if (!sk_X509_push(sk, x)) { 1183 SSLerror(s, ERR_R_MALLOC_FAILURE); 1184 goto err; 1185 } 1186 x = NULL; 1187 } 1188 1189 i = ssl_verify_cert_chain(s, sk); 1190 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1191 al = ssl_verify_alarm_type(s->verify_result); 1192 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1193 goto fatal_err; 1194 1195 } 1196 ERR_clear_error(); /* but we keep s->verify_result */ 1197 1198 sc = ssl_sess_cert_new(); 1199 if (sc == NULL) 1200 goto err; 1201 ssl_sess_cert_free(SSI(s)->sess_cert); 1202 SSI(s)->sess_cert = sc; 1203 1204 sc->cert_chain = sk; 1205 /* 1206 * Inconsistency alert: cert_chain does include the peer's 1207 * certificate, which we don't include in s3_srvr.c 1208 */ 1209 x = sk_X509_value(sk, 0); 1210 sk = NULL; 1211 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1212 1213 pkey = X509_get_pubkey(x); 1214 1215 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1216 x = NULL; 1217 al = SSL3_AL_FATAL; 1218 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1219 goto fatal_err; 1220 } 1221 1222 i = ssl_cert_type(x, pkey); 1223 if (i < 0) { 1224 x = NULL; 1225 al = SSL3_AL_FATAL; 1226 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1227 goto fatal_err; 1228 } 1229 1230 sc->peer_cert_type = i; 1231 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1232 /* 1233 * Why would the following ever happen? 1234 * We just created sc a couple of lines ago. 1235 */ 1236 X509_free(sc->peer_pkeys[i].x509); 1237 sc->peer_pkeys[i].x509 = x; 1238 sc->peer_key = &(sc->peer_pkeys[i]); 1239 1240 X509_free(s->session->peer); 1241 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1242 s->session->peer = x; 1243 s->session->verify_result = s->verify_result; 1244 1245 x = NULL; 1246 ret = 1; 1247 1248 if (0) { 1249 decode_err: 1250 /* wrong packet length */ 1251 al = SSL_AD_DECODE_ERROR; 1252 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1253 fatal_err: 1254 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1255 } 1256 err: 1257 EVP_PKEY_free(pkey); 1258 X509_free(x); 1259 sk_X509_pop_free(sk, X509_free); 1260 1261 return (ret); 1262 } 1263 1264 static int 1265 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1266 { 1267 CBS dhp, dhg, dhpk; 1268 BN_CTX *bn_ctx = NULL; 1269 SESS_CERT *sc = NULL; 1270 DH *dh = NULL; 1271 long alg_a; 1272 int al; 1273 1274 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1275 sc = SSI(s)->sess_cert; 1276 1277 if ((dh = DH_new()) == NULL) { 1278 SSLerror(s, ERR_R_DH_LIB); 1279 goto err; 1280 } 1281 1282 if (!CBS_get_u16_length_prefixed(cbs, &dhp)) 1283 goto decode_err; 1284 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1285 SSLerror(s, ERR_R_BN_LIB); 1286 goto err; 1287 } 1288 1289 if (!CBS_get_u16_length_prefixed(cbs, &dhg)) 1290 goto decode_err; 1291 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1292 SSLerror(s, ERR_R_BN_LIB); 1293 goto err; 1294 } 1295 1296 if (!CBS_get_u16_length_prefixed(cbs, &dhpk)) 1297 goto decode_err; 1298 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1299 NULL)) == NULL) { 1300 SSLerror(s, ERR_R_BN_LIB); 1301 goto err; 1302 } 1303 1304 /* 1305 * Check the strength of the DH key just constructed. 1306 * Discard keys weaker than 1024 bits. 1307 */ 1308 if (DH_size(dh) < 1024 / 8) { 1309 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1310 goto err; 1311 } 1312 1313 if (alg_a & SSL_aRSA) 1314 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1315 else 1316 /* XXX - Anonymous DH, so no certificate or pkey. */ 1317 *pkey = NULL; 1318 1319 sc->peer_dh_tmp = dh; 1320 1321 return (1); 1322 1323 decode_err: 1324 al = SSL_AD_DECODE_ERROR; 1325 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1326 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1327 1328 err: 1329 DH_free(dh); 1330 BN_CTX_free(bn_ctx); 1331 1332 return (-1); 1333 } 1334 1335 static int 1336 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1337 { 1338 EC_KEY *ecdh = NULL; 1339 int ret = -1; 1340 1341 /* Extract the server's ephemeral ECDH public key. */ 1342 if ((ecdh = EC_KEY_new()) == NULL) { 1343 SSLerror(s, ERR_R_MALLOC_FAILURE); 1344 goto err; 1345 } 1346 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh, nid, public)) { 1347 SSLerror(s, SSL_R_BAD_ECPOINT); 1348 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1349 goto err; 1350 } 1351 1352 sc->peer_nid = nid; 1353 sc->peer_ecdh_tmp = ecdh; 1354 ecdh = NULL; 1355 1356 ret = 1; 1357 1358 err: 1359 EC_KEY_free(ecdh); 1360 1361 return (ret); 1362 } 1363 1364 static int 1365 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1366 { 1367 size_t outlen; 1368 1369 if (nid != NID_X25519) { 1370 SSLerror(s, ERR_R_INTERNAL_ERROR); 1371 goto err; 1372 } 1373 1374 if (CBS_len(public) != X25519_KEY_LENGTH) { 1375 SSLerror(s, SSL_R_BAD_ECPOINT); 1376 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1377 goto err; 1378 } 1379 1380 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1381 SSLerror(s, ERR_R_MALLOC_FAILURE); 1382 goto err; 1383 } 1384 1385 return (1); 1386 1387 err: 1388 return (-1); 1389 } 1390 1391 static int 1392 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1393 { 1394 CBS public; 1395 uint8_t curve_type; 1396 uint16_t curve_id; 1397 SESS_CERT *sc; 1398 long alg_a; 1399 int nid; 1400 int al; 1401 1402 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1403 sc = SSI(s)->sess_cert; 1404 1405 /* Only named curves are supported. */ 1406 if (!CBS_get_u8(cbs, &curve_type) || 1407 curve_type != NAMED_CURVE_TYPE || 1408 !CBS_get_u16(cbs, &curve_id)) { 1409 al = SSL_AD_DECODE_ERROR; 1410 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1411 goto fatal_err; 1412 } 1413 1414 /* 1415 * Check that the curve is one of our preferences - if it is not, 1416 * the server has sent us an invalid curve. 1417 */ 1418 if (tls1_check_curve(s, curve_id) != 1) { 1419 al = SSL_AD_DECODE_ERROR; 1420 SSLerror(s, SSL_R_WRONG_CURVE); 1421 goto fatal_err; 1422 } 1423 1424 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1425 al = SSL_AD_INTERNAL_ERROR; 1426 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1427 goto fatal_err; 1428 } 1429 1430 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1431 goto decode_err; 1432 1433 if (nid == NID_X25519) { 1434 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1435 goto err; 1436 } else { 1437 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1438 goto err; 1439 } 1440 1441 /* 1442 * The ECC/TLS specification does not mention the use of DSA to sign 1443 * ECParameters in the server key exchange message. We do support RSA 1444 * and ECDSA. 1445 */ 1446 if (alg_a & SSL_aRSA) 1447 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1448 else if (alg_a & SSL_aECDSA) 1449 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1450 else 1451 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1452 *pkey = NULL; 1453 1454 return (1); 1455 1456 decode_err: 1457 al = SSL_AD_DECODE_ERROR; 1458 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1459 1460 fatal_err: 1461 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1462 1463 err: 1464 return (-1); 1465 } 1466 1467 int 1468 ssl3_get_server_key_exchange(SSL *s) 1469 { 1470 CBS cbs, signature; 1471 const EVP_MD *md = NULL; 1472 EVP_PKEY *pkey = NULL; 1473 EVP_MD_CTX md_ctx; 1474 const unsigned char *param; 1475 long n, alg_k, alg_a; 1476 int al, ok; 1477 size_t param_len; 1478 1479 EVP_MD_CTX_init(&md_ctx); 1480 1481 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1482 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1483 1484 /* 1485 * Use same message size as in ssl3_get_certificate_request() 1486 * as ServerKeyExchange message may be skipped. 1487 */ 1488 n = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1489 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1490 if (!ok) 1491 return ((int)n); 1492 1493 if (n < 0) 1494 goto err; 1495 1496 CBS_init(&cbs, s->internal->init_msg, n); 1497 1498 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1499 /* 1500 * Do not skip server key exchange if this cipher suite uses 1501 * ephemeral keys. 1502 */ 1503 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1504 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1505 al = SSL_AD_UNEXPECTED_MESSAGE; 1506 goto fatal_err; 1507 } 1508 1509 S3I(s)->tmp.reuse_message = 1; 1510 EVP_MD_CTX_cleanup(&md_ctx); 1511 return (1); 1512 } 1513 1514 if (SSI(s)->sess_cert != NULL) { 1515 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1516 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1517 1518 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1519 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1520 1521 free(SSI(s)->sess_cert->peer_x25519_tmp); 1522 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1523 } else { 1524 SSI(s)->sess_cert = ssl_sess_cert_new(); 1525 if (SSI(s)->sess_cert == NULL) 1526 goto err; 1527 } 1528 1529 param = CBS_data(&cbs); 1530 param_len = CBS_len(&cbs); 1531 1532 if (alg_k & SSL_kDHE) { 1533 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1) 1534 goto err; 1535 } else if (alg_k & SSL_kECDHE) { 1536 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1) 1537 goto err; 1538 } else if (alg_k != 0) { 1539 al = SSL_AD_UNEXPECTED_MESSAGE; 1540 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1541 goto fatal_err; 1542 } 1543 1544 param_len -= CBS_len(&cbs); 1545 1546 /* if it was signed, check the signature */ 1547 if (pkey != NULL) { 1548 EVP_PKEY_CTX *pctx; 1549 const struct ssl_sigalg *sigalg; 1550 1551 if (SSL_USE_SIGALGS(s)) { 1552 uint16_t sigalg_value; 1553 1554 if (!CBS_get_u16(&cbs, &sigalg_value)) 1555 goto decode_err; 1556 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, 1557 tls12_sigalgs_len)) == NULL) { 1558 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1559 al = SSL_AD_DECODE_ERROR; 1560 goto fatal_err; 1561 } 1562 if ((md = sigalg->md()) == NULL) { 1563 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1564 al = SSL_AD_DECODE_ERROR; 1565 goto fatal_err; 1566 } 1567 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) { 1568 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 1569 al = SSL_AD_DECODE_ERROR; 1570 goto fatal_err; 1571 } 1572 } else if (pkey->type == EVP_PKEY_RSA) { 1573 sigalg = ssl_sigalg_lookup(SIGALG_RSA_PKCS1_MD5_SHA1); 1574 } else if (pkey->type == EVP_PKEY_EC) { 1575 sigalg = ssl_sigalg_lookup(SIGALG_ECDSA_SHA1); 1576 } else { 1577 SSLerror(s, SSL_R_UNKNOWN_PKEY_TYPE); 1578 al = SSL_AD_DECODE_ERROR; 1579 goto fatal_err; 1580 } 1581 md = sigalg->md(); 1582 1583 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1584 goto decode_err; 1585 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1586 al = SSL_AD_DECODE_ERROR; 1587 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1588 goto fatal_err; 1589 } 1590 1591 if (!EVP_DigestVerifyInit(&md_ctx, &pctx, md, NULL, pkey)) 1592 goto err; 1593 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->client_random, 1594 SSL3_RANDOM_SIZE)) 1595 goto err; 1596 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1597 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1598 RSA_PKCS1_PSS_PADDING) || 1599 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1600 goto err; 1601 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->server_random, 1602 SSL3_RANDOM_SIZE)) 1603 goto err; 1604 if (!EVP_DigestVerifyUpdate(&md_ctx, param, param_len)) 1605 goto err; 1606 if (EVP_DigestVerifyFinal(&md_ctx, CBS_data(&signature), 1607 CBS_len(&signature)) <= 0) { 1608 al = SSL_AD_DECRYPT_ERROR; 1609 SSLerror(s, SSL_R_BAD_SIGNATURE); 1610 goto fatal_err; 1611 } 1612 } else { 1613 /* aNULL does not need public keys. */ 1614 if (!(alg_a & SSL_aNULL)) { 1615 SSLerror(s, ERR_R_INTERNAL_ERROR); 1616 goto err; 1617 } 1618 } 1619 1620 if (CBS_len(&cbs) != 0) { 1621 al = SSL_AD_DECODE_ERROR; 1622 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1623 goto fatal_err; 1624 } 1625 1626 EVP_PKEY_free(pkey); 1627 EVP_MD_CTX_cleanup(&md_ctx); 1628 1629 return (1); 1630 1631 decode_err: 1632 al = SSL_AD_DECODE_ERROR; 1633 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1634 1635 fatal_err: 1636 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1637 1638 err: 1639 EVP_PKEY_free(pkey); 1640 EVP_MD_CTX_cleanup(&md_ctx); 1641 1642 return (-1); 1643 } 1644 1645 int 1646 ssl3_get_certificate_request(SSL *s) 1647 { 1648 int ok, ret = 0; 1649 long n; 1650 uint8_t ctype_num; 1651 CBS cert_request, ctypes, rdn_list; 1652 X509_NAME *xn = NULL; 1653 const unsigned char *q; 1654 STACK_OF(X509_NAME) *ca_sk = NULL; 1655 1656 n = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1657 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1658 if (!ok) 1659 return ((int)n); 1660 1661 S3I(s)->tmp.cert_req = 0; 1662 1663 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_DONE) { 1664 S3I(s)->tmp.reuse_message = 1; 1665 /* 1666 * If we get here we don't need any cached handshake records 1667 * as we wont be doing client auth. 1668 */ 1669 tls1_transcript_free(s); 1670 return (1); 1671 } 1672 1673 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1674 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1675 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1676 goto err; 1677 } 1678 1679 /* TLS does not like anon-DH with client cert */ 1680 if (S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL) { 1681 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1682 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1683 goto err; 1684 } 1685 1686 if (n < 0) 1687 goto decode_err; 1688 CBS_init(&cert_request, s->internal->init_msg, n); 1689 1690 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1691 SSLerror(s, ERR_R_MALLOC_FAILURE); 1692 goto err; 1693 } 1694 1695 /* get the certificate types */ 1696 if (!CBS_get_u8(&cert_request, &ctype_num)) 1697 goto decode_err; 1698 1699 if (ctype_num > SSL3_CT_NUMBER) 1700 ctype_num = SSL3_CT_NUMBER; 1701 if (!CBS_get_bytes(&cert_request, &ctypes, ctype_num) || 1702 !CBS_write_bytes(&ctypes, (uint8_t *)S3I(s)->tmp.ctype, 1703 sizeof(S3I(s)->tmp.ctype), NULL)) { 1704 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1705 goto err; 1706 } 1707 1708 if (SSL_USE_SIGALGS(s)) { 1709 CBS sigalgs; 1710 1711 if (CBS_len(&cert_request) < 2) { 1712 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1713 goto err; 1714 } 1715 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1716 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1717 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1718 goto err; 1719 } 1720 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1721 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1722 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1723 goto err; 1724 } 1725 if (!CBS_stow(&sigalgs, &S3I(s)->hs.sigalgs, 1726 &S3I(s)->hs.sigalgs_len)) 1727 goto err; 1728 } 1729 1730 /* get the CA RDNs */ 1731 if (CBS_len(&cert_request) < 2) { 1732 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1733 goto err; 1734 } 1735 1736 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1737 CBS_len(&cert_request) != 0) { 1738 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1739 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1740 goto err; 1741 } 1742 1743 while (CBS_len(&rdn_list) > 0) { 1744 CBS rdn; 1745 1746 if (CBS_len(&rdn_list) < 2) { 1747 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1748 goto err; 1749 } 1750 1751 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1752 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1753 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1754 goto err; 1755 } 1756 1757 q = CBS_data(&rdn); 1758 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1759 ssl3_send_alert(s, SSL3_AL_FATAL, 1760 SSL_AD_DECODE_ERROR); 1761 SSLerror(s, ERR_R_ASN1_LIB); 1762 goto err; 1763 } 1764 1765 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1766 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1767 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1768 goto err; 1769 } 1770 if (!sk_X509_NAME_push(ca_sk, xn)) { 1771 SSLerror(s, ERR_R_MALLOC_FAILURE); 1772 goto err; 1773 } 1774 xn = NULL; /* avoid free in err block */ 1775 } 1776 1777 /* we should setup a certificate to return.... */ 1778 S3I(s)->tmp.cert_req = 1; 1779 S3I(s)->tmp.ctype_num = ctype_num; 1780 sk_X509_NAME_pop_free(S3I(s)->tmp.ca_names, X509_NAME_free); 1781 S3I(s)->tmp.ca_names = ca_sk; 1782 ca_sk = NULL; 1783 1784 ret = 1; 1785 if (0) { 1786 decode_err: 1787 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1788 } 1789 err: 1790 X509_NAME_free(xn); 1791 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1792 return (ret); 1793 } 1794 1795 static int 1796 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1797 { 1798 return (X509_NAME_cmp(*a, *b)); 1799 } 1800 1801 int 1802 ssl3_get_new_session_ticket(SSL *s) 1803 { 1804 int ok, al, ret = 0; 1805 uint32_t lifetime_hint; 1806 long n; 1807 CBS cbs, session_ticket; 1808 1809 n = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1810 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1811 if (!ok) 1812 return ((int)n); 1813 1814 if (S3I(s)->tmp.message_type == SSL3_MT_FINISHED) { 1815 S3I(s)->tmp.reuse_message = 1; 1816 return (1); 1817 } 1818 if (S3I(s)->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) { 1819 al = SSL_AD_UNEXPECTED_MESSAGE; 1820 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1821 goto fatal_err; 1822 } 1823 1824 if (n < 0) { 1825 al = SSL_AD_DECODE_ERROR; 1826 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1827 goto fatal_err; 1828 } 1829 1830 CBS_init(&cbs, s->internal->init_msg, n); 1831 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1832 #if UINT32_MAX > LONG_MAX 1833 lifetime_hint > LONG_MAX || 1834 #endif 1835 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1836 CBS_len(&cbs) != 0) { 1837 al = SSL_AD_DECODE_ERROR; 1838 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1839 goto fatal_err; 1840 } 1841 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1842 1843 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1844 &s->session->tlsext_ticklen)) { 1845 SSLerror(s, ERR_R_MALLOC_FAILURE); 1846 goto err; 1847 } 1848 1849 /* 1850 * There are two ways to detect a resumed ticket sesion. 1851 * One is to set an appropriate session ID and then the server 1852 * must return a match in ServerHello. This allows the normal 1853 * client session ID matching to work and we know much 1854 * earlier that the ticket has been accepted. 1855 * 1856 * The other way is to set zero length session ID when the 1857 * ticket is presented and rely on the handshake to determine 1858 * session resumption. 1859 * 1860 * We choose the former approach because this fits in with 1861 * assumptions elsewhere in OpenSSL. The session ID is set 1862 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1863 * ticket. 1864 */ 1865 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1866 s->session->session_id, &s->session->session_id_length, 1867 EVP_sha256(), NULL); 1868 ret = 1; 1869 return (ret); 1870 fatal_err: 1871 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1872 err: 1873 return (-1); 1874 } 1875 1876 int 1877 ssl3_get_cert_status(SSL *s) 1878 { 1879 CBS cert_status, response; 1880 int ok, al; 1881 long n; 1882 uint8_t status_type; 1883 1884 n = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1885 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 1886 16384, &ok); 1887 if (!ok) 1888 return ((int)n); 1889 1890 if (n < 0) { 1891 /* need at least status type + length */ 1892 al = SSL_AD_DECODE_ERROR; 1893 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1894 goto fatal_err; 1895 } 1896 1897 CBS_init(&cert_status, s->internal->init_msg, n); 1898 if (!CBS_get_u8(&cert_status, &status_type) || 1899 CBS_len(&cert_status) < 3) { 1900 /* need at least status type + length */ 1901 al = SSL_AD_DECODE_ERROR; 1902 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1903 goto fatal_err; 1904 } 1905 1906 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1907 al = SSL_AD_DECODE_ERROR; 1908 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1909 goto fatal_err; 1910 } 1911 1912 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1913 CBS_len(&cert_status) != 0) { 1914 al = SSL_AD_DECODE_ERROR; 1915 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1916 goto fatal_err; 1917 } 1918 1919 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1920 &s->internal->tlsext_ocsp_resp_len)) { 1921 al = SSL_AD_INTERNAL_ERROR; 1922 SSLerror(s, ERR_R_MALLOC_FAILURE); 1923 goto fatal_err; 1924 } 1925 1926 if (s->ctx->internal->tlsext_status_cb) { 1927 int ret; 1928 ret = s->ctx->internal->tlsext_status_cb(s, 1929 s->ctx->internal->tlsext_status_arg); 1930 if (ret == 0) { 1931 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1932 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1933 goto fatal_err; 1934 } 1935 if (ret < 0) { 1936 al = SSL_AD_INTERNAL_ERROR; 1937 SSLerror(s, ERR_R_MALLOC_FAILURE); 1938 goto fatal_err; 1939 } 1940 } 1941 return (1); 1942 fatal_err: 1943 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1944 return (-1); 1945 } 1946 1947 int 1948 ssl3_get_server_done(SSL *s) 1949 { 1950 int ok, ret = 0; 1951 long n; 1952 1953 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1954 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1955 30, /* should be very small, like 0 :-) */ &ok); 1956 if (!ok) 1957 return ((int)n); 1958 1959 if (n > 0) { 1960 /* should contain no data */ 1961 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1962 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1963 return (-1); 1964 } 1965 ret = 1; 1966 return (ret); 1967 } 1968 1969 static int 1970 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1971 { 1972 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1973 unsigned char *enc_pms = NULL; 1974 EVP_PKEY *pkey = NULL; 1975 int ret = -1; 1976 int enc_len; 1977 CBB epms; 1978 1979 /* 1980 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1981 */ 1982 1983 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA].x509); 1984 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1985 pkey->pkey.rsa == NULL) { 1986 SSLerror(s, ERR_R_INTERNAL_ERROR); 1987 goto err; 1988 } 1989 1990 pms[0] = s->client_version >> 8; 1991 pms[1] = s->client_version & 0xff; 1992 arc4random_buf(&pms[2], sizeof(pms) - 2); 1993 1994 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1995 SSLerror(s, ERR_R_MALLOC_FAILURE); 1996 goto err; 1997 } 1998 1999 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 2000 RSA_PKCS1_PADDING); 2001 if (enc_len <= 0) { 2002 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 2003 goto err; 2004 } 2005 2006 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 2007 goto err; 2008 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 2009 goto err; 2010 if (!CBB_flush(cbb)) 2011 goto err; 2012 2013 s->session->master_key_length = 2014 tls1_generate_master_secret(s, 2015 s->session->master_key, pms, sizeof(pms)); 2016 2017 ret = 1; 2018 2019 err: 2020 explicit_bzero(pms, sizeof(pms)); 2021 EVP_PKEY_free(pkey); 2022 free(enc_pms); 2023 2024 return (ret); 2025 } 2026 2027 static int 2028 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2029 { 2030 DH *dh_srvr = NULL, *dh_clnt = NULL; 2031 unsigned char *key = NULL; 2032 int key_size = 0, key_len; 2033 unsigned char *data; 2034 int ret = -1; 2035 CBB dh_Yc; 2036 2037 /* Ensure that we have an ephemeral key for DHE. */ 2038 if (sess_cert->peer_dh_tmp == NULL) { 2039 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2040 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 2041 goto err; 2042 } 2043 dh_srvr = sess_cert->peer_dh_tmp; 2044 2045 /* Generate a new random key. */ 2046 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2047 SSLerror(s, ERR_R_DH_LIB); 2048 goto err; 2049 } 2050 if (!DH_generate_key(dh_clnt)) { 2051 SSLerror(s, ERR_R_DH_LIB); 2052 goto err; 2053 } 2054 if ((key_size = DH_size(dh_clnt)) <= 0) { 2055 SSLerror(s, ERR_R_DH_LIB); 2056 goto err; 2057 } 2058 if ((key = malloc(key_size)) == NULL) { 2059 SSLerror(s, ERR_R_MALLOC_FAILURE); 2060 goto err; 2061 } 2062 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) { 2063 SSLerror(s, ERR_R_DH_LIB); 2064 goto err; 2065 } 2066 2067 /* Generate master key from the result. */ 2068 s->session->master_key_length = 2069 tls1_generate_master_secret(s, 2070 s->session->master_key, key, key_len); 2071 2072 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2073 goto err; 2074 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2075 goto err; 2076 BN_bn2bin(dh_clnt->pub_key, data); 2077 if (!CBB_flush(cbb)) 2078 goto err; 2079 2080 ret = 1; 2081 2082 err: 2083 DH_free(dh_clnt); 2084 freezero(key, key_size); 2085 2086 return (ret); 2087 } 2088 2089 static int 2090 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2091 { 2092 EC_KEY *ecdh = NULL; 2093 uint8_t *key = NULL; 2094 size_t key_len = 0; 2095 int ret = -1; 2096 CBB ecpoint; 2097 2098 if ((ecdh = EC_KEY_new()) == NULL) { 2099 SSLerror(s, ERR_R_MALLOC_FAILURE); 2100 goto err; 2101 } 2102 2103 if (!ssl_kex_generate_ecdhe_ecp(ecdh, sc->peer_nid)) 2104 goto err; 2105 2106 /* Encode our public key. */ 2107 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2108 goto err; 2109 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 2110 goto err; 2111 if (!CBB_flush(cbb)) 2112 goto err; 2113 2114 if (!ssl_kex_derive_ecdhe_ecp(ecdh, sc->peer_ecdh_tmp, &key, &key_len)) 2115 goto err; 2116 s->session->master_key_length = tls1_generate_master_secret(s, 2117 s->session->master_key, key, key_len); 2118 2119 ret = 1; 2120 2121 err: 2122 freezero(key, key_len); 2123 EC_KEY_free(ecdh); 2124 2125 return (ret); 2126 } 2127 2128 static int 2129 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2130 { 2131 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2132 int ret = -1; 2133 CBB ecpoint; 2134 2135 /* Generate X25519 key pair and derive shared key. */ 2136 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2137 goto err; 2138 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2139 goto err; 2140 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2141 goto err; 2142 X25519_keypair(public_key, private_key); 2143 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2144 goto err; 2145 2146 /* Serialize the public key. */ 2147 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2148 goto err; 2149 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2150 goto err; 2151 if (!CBB_flush(cbb)) 2152 goto err; 2153 2154 /* Generate master key from the result. */ 2155 s->session->master_key_length = 2156 tls1_generate_master_secret(s, 2157 s->session->master_key, shared_key, X25519_KEY_LENGTH); 2158 2159 ret = 1; 2160 2161 err: 2162 free(public_key); 2163 freezero(private_key, X25519_KEY_LENGTH); 2164 freezero(shared_key, X25519_KEY_LENGTH); 2165 2166 return (ret); 2167 } 2168 2169 static int 2170 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2171 { 2172 if (sc->peer_x25519_tmp != NULL) { 2173 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2174 goto err; 2175 } else if (sc->peer_ecdh_tmp != NULL) { 2176 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2177 goto err; 2178 } else { 2179 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2180 SSLerror(s, ERR_R_INTERNAL_ERROR); 2181 goto err; 2182 } 2183 2184 return (1); 2185 2186 err: 2187 return (-1); 2188 } 2189 2190 static int 2191 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2192 { 2193 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2194 EVP_PKEY *pub_key = NULL; 2195 EVP_PKEY_CTX *pkey_ctx; 2196 X509 *peer_cert; 2197 size_t msglen; 2198 unsigned int md_len; 2199 EVP_MD_CTX *ukm_hash; 2200 int ret = -1; 2201 int nid; 2202 CBB gostblob; 2203 2204 /* Get server sertificate PKEY and create ctx from it */ 2205 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2206 if (peer_cert == NULL) { 2207 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2208 goto err; 2209 } 2210 2211 pub_key = X509_get_pubkey(peer_cert); 2212 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2213 2214 /* 2215 * If we have send a certificate, and certificate key parameters match 2216 * those of server certificate, use certificate key for key exchange. 2217 * Otherwise, generate ephemeral key pair. 2218 */ 2219 EVP_PKEY_encrypt_init(pkey_ctx); 2220 2221 /* Generate session key. */ 2222 arc4random_buf(premaster_secret, 32); 2223 2224 /* 2225 * If we have client certificate, use its secret as peer key. 2226 */ 2227 if (S3I(s)->tmp.cert_req && s->cert->key->privatekey) { 2228 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2229 s->cert->key->privatekey) <=0) { 2230 /* 2231 * If there was an error - just ignore it. 2232 * Ephemeral key would be used. 2233 */ 2234 ERR_clear_error(); 2235 } 2236 } 2237 2238 /* 2239 * Compute shared IV and store it in algorithm-specific context data. 2240 */ 2241 ukm_hash = EVP_MD_CTX_new(); 2242 if (ukm_hash == NULL) { 2243 SSLerror(s, ERR_R_MALLOC_FAILURE); 2244 goto err; 2245 } 2246 2247 /* XXX check handshake hash instead. */ 2248 if (S3I(s)->hs.new_cipher->algorithm2 & SSL_HANDSHAKE_MAC_GOST94) 2249 nid = NID_id_GostR3411_94; 2250 else 2251 nid = NID_id_tc26_gost3411_2012_256; 2252 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2253 goto err; 2254 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2255 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2256 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2257 EVP_MD_CTX_free(ukm_hash); 2258 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2259 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2260 SSLerror(s, SSL_R_LIBRARY_BUG); 2261 goto err; 2262 } 2263 2264 /* 2265 * Make GOST keytransport blob message, encapsulate it into sequence. 2266 */ 2267 msglen = 255; 2268 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2269 32) < 0) { 2270 SSLerror(s, SSL_R_LIBRARY_BUG); 2271 goto err; 2272 } 2273 2274 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2275 goto err; 2276 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2277 goto err; 2278 if (!CBB_flush(cbb)) 2279 goto err; 2280 2281 /* Check if pubkey from client certificate was used. */ 2282 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2283 NULL) > 0) { 2284 /* Set flag "skip certificate verify". */ 2285 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2286 } 2287 EVP_PKEY_CTX_free(pkey_ctx); 2288 s->session->master_key_length = 2289 tls1_generate_master_secret(s, 2290 s->session->master_key, premaster_secret, 32); 2291 2292 ret = 1; 2293 2294 err: 2295 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2296 EVP_PKEY_free(pub_key); 2297 2298 return (ret); 2299 } 2300 2301 int 2302 ssl3_send_client_key_exchange(SSL *s) 2303 { 2304 SESS_CERT *sess_cert; 2305 unsigned long alg_k; 2306 CBB cbb, kex; 2307 2308 memset(&cbb, 0, sizeof(cbb)); 2309 2310 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2311 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2312 2313 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2314 ssl3_send_alert(s, SSL3_AL_FATAL, 2315 SSL_AD_UNEXPECTED_MESSAGE); 2316 SSLerror(s, ERR_R_INTERNAL_ERROR); 2317 goto err; 2318 } 2319 2320 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2321 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2322 goto err; 2323 2324 if (alg_k & SSL_kRSA) { 2325 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2326 goto err; 2327 } else if (alg_k & SSL_kDHE) { 2328 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2329 goto err; 2330 } else if (alg_k & SSL_kECDHE) { 2331 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2332 goto err; 2333 } else if (alg_k & SSL_kGOST) { 2334 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2335 goto err; 2336 } else { 2337 ssl3_send_alert(s, SSL3_AL_FATAL, 2338 SSL_AD_HANDSHAKE_FAILURE); 2339 SSLerror(s, ERR_R_INTERNAL_ERROR); 2340 goto err; 2341 } 2342 2343 if (!ssl3_handshake_msg_finish(s, &cbb)) 2344 goto err; 2345 2346 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2347 } 2348 2349 /* SSL3_ST_CW_KEY_EXCH_B */ 2350 return (ssl3_handshake_write(s)); 2351 2352 err: 2353 CBB_cleanup(&cbb); 2354 2355 return (-1); 2356 } 2357 2358 static int 2359 ssl3_send_client_verify_sigalgs(SSL *s, CBB *cert_verify) 2360 { 2361 const struct ssl_sigalg *sigalg; 2362 CBB cbb_signature; 2363 EVP_PKEY_CTX *pctx = NULL; 2364 EVP_PKEY *pkey; 2365 EVP_MD_CTX mctx; 2366 const EVP_MD *md; 2367 const unsigned char *hdata; 2368 unsigned char *signature = NULL; 2369 size_t signature_len, hdata_len; 2370 int ret = 0; 2371 2372 EVP_MD_CTX_init(&mctx); 2373 2374 pkey = s->cert->key->privatekey; 2375 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2376 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2377 goto err; 2378 } 2379 if ((md = sigalg->md()) == NULL) { 2380 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 2381 goto err; 2382 } 2383 2384 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2385 SSLerror(s, ERR_R_INTERNAL_ERROR); 2386 goto err; 2387 } 2388 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2389 SSLerror(s, ERR_R_EVP_LIB); 2390 goto err; 2391 } 2392 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2393 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2394 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2395 SSLerror(s, ERR_R_EVP_LIB); 2396 goto err; 2397 } 2398 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2399 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2400 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2401 SSLerror(s, ERR_R_EVP_LIB); 2402 goto err; 2403 } 2404 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2405 SSLerror(s, ERR_R_EVP_LIB); 2406 goto err; 2407 } 2408 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2409 signature_len == 0) { 2410 SSLerror(s, ERR_R_EVP_LIB); 2411 goto err; 2412 } 2413 if ((signature = calloc(1, signature_len)) == NULL) { 2414 SSLerror(s, ERR_R_MALLOC_FAILURE); 2415 goto err; 2416 } 2417 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2418 SSLerror(s, ERR_R_EVP_LIB); 2419 goto err; 2420 } 2421 2422 if (!CBB_add_u16(cert_verify, sigalg->value)) 2423 goto err; 2424 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2425 goto err; 2426 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2427 goto err; 2428 if (!CBB_flush(cert_verify)) 2429 goto err; 2430 2431 ret = 1; 2432 2433 err: 2434 EVP_MD_CTX_cleanup(&mctx); 2435 free(signature); 2436 return ret; 2437 } 2438 2439 static int 2440 ssl3_send_client_verify_rsa(SSL *s, CBB *cert_verify) 2441 { 2442 CBB cbb_signature; 2443 EVP_PKEY *pkey; 2444 unsigned char data[EVP_MAX_MD_SIZE]; 2445 unsigned char *signature = NULL; 2446 unsigned int signature_len; 2447 size_t data_len; 2448 int ret = 0; 2449 2450 pkey = s->cert->key->privatekey; 2451 2452 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2453 goto err; 2454 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2455 goto err; 2456 if (RSA_sign(NID_md5_sha1, data, data_len, signature, 2457 &signature_len, pkey->pkey.rsa) <= 0 ) { 2458 SSLerror(s, ERR_R_RSA_LIB); 2459 goto err; 2460 } 2461 2462 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2463 goto err; 2464 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2465 goto err; 2466 if (!CBB_flush(cert_verify)) 2467 goto err; 2468 2469 ret = 1; 2470 err: 2471 free(signature); 2472 return ret; 2473 } 2474 2475 static int 2476 ssl3_send_client_verify_ec(SSL *s, CBB *cert_verify) 2477 { 2478 CBB cbb_signature; 2479 EVP_PKEY *pkey; 2480 unsigned char data[EVP_MAX_MD_SIZE]; 2481 unsigned char *signature = NULL; 2482 unsigned int signature_len; 2483 int ret = 0; 2484 2485 pkey = s->cert->key->privatekey; 2486 2487 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2488 goto err; 2489 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2490 goto err; 2491 if (!ECDSA_sign(pkey->save_type, &data[MD5_DIGEST_LENGTH], 2492 SHA_DIGEST_LENGTH, signature, &signature_len, pkey->pkey.ec)) { 2493 SSLerror(s, ERR_R_ECDSA_LIB); 2494 goto err; 2495 } 2496 2497 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2498 goto err; 2499 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2500 goto err; 2501 if (!CBB_flush(cert_verify)) 2502 goto err; 2503 2504 ret = 1; 2505 err: 2506 free(signature); 2507 return ret; 2508 } 2509 2510 #ifndef OPENSSL_NO_GOST 2511 static int 2512 ssl3_send_client_verify_gost(SSL *s, CBB *cert_verify) 2513 { 2514 CBB cbb_signature; 2515 EVP_MD_CTX mctx; 2516 EVP_PKEY_CTX *pctx; 2517 EVP_PKEY *pkey; 2518 const EVP_MD *md; 2519 const unsigned char *hdata; 2520 unsigned char *signature = NULL; 2521 size_t signature_len; 2522 size_t hdata_len; 2523 int nid; 2524 int ret = 0; 2525 2526 EVP_MD_CTX_init(&mctx); 2527 2528 pkey = s->cert->key->privatekey; 2529 2530 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2531 SSLerror(s, ERR_R_INTERNAL_ERROR); 2532 goto err; 2533 } 2534 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2535 (md = EVP_get_digestbynid(nid)) == NULL) { 2536 SSLerror(s, ERR_R_EVP_LIB); 2537 goto err; 2538 } 2539 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2540 SSLerror(s, ERR_R_EVP_LIB); 2541 goto err; 2542 } 2543 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2544 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2545 SSLerror(s, ERR_R_EVP_LIB); 2546 goto err; 2547 } 2548 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2549 SSLerror(s, ERR_R_EVP_LIB); 2550 goto err; 2551 } 2552 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2553 signature_len == 0) { 2554 SSLerror(s, ERR_R_EVP_LIB); 2555 goto err; 2556 } 2557 if ((signature = calloc(1, signature_len)) == NULL) { 2558 SSLerror(s, ERR_R_MALLOC_FAILURE); 2559 goto err; 2560 } 2561 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2562 SSLerror(s, ERR_R_EVP_LIB); 2563 goto err; 2564 } 2565 2566 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2567 goto err; 2568 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2569 goto err; 2570 if (!CBB_flush(cert_verify)) 2571 goto err; 2572 2573 ret = 1; 2574 err: 2575 EVP_MD_CTX_cleanup(&mctx); 2576 free(signature); 2577 return ret; 2578 } 2579 #endif 2580 2581 int 2582 ssl3_send_client_verify(SSL *s) 2583 { 2584 CBB cbb, cert_verify; 2585 EVP_PKEY *pkey; 2586 2587 memset(&cbb, 0, sizeof(cbb)); 2588 2589 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2590 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2591 SSL3_MT_CERTIFICATE_VERIFY)) 2592 goto err; 2593 2594 pkey = s->cert->key->privatekey; 2595 2596 /* 2597 * For TLS v1.2 send signature algorithm and signature 2598 * using agreed digest and cached handshake records. 2599 */ 2600 if (SSL_USE_SIGALGS(s)) { 2601 if (!ssl3_send_client_verify_sigalgs(s, &cert_verify)) 2602 goto err; 2603 } else if (pkey->type == EVP_PKEY_RSA) { 2604 if (!ssl3_send_client_verify_rsa(s, &cert_verify)) 2605 goto err; 2606 } else if (pkey->type == EVP_PKEY_EC) { 2607 if (!ssl3_send_client_verify_ec(s, &cert_verify)) 2608 goto err; 2609 #ifndef OPENSSL_NO_GOST 2610 } else if (pkey->type == NID_id_GostR3410_94 || 2611 pkey->type == NID_id_GostR3410_2001) { 2612 if (!ssl3_send_client_verify_gost(s, &cert_verify)) 2613 goto err; 2614 #endif 2615 } else { 2616 SSLerror(s, ERR_R_INTERNAL_ERROR); 2617 goto err; 2618 } 2619 2620 tls1_transcript_free(s); 2621 2622 if (!ssl3_handshake_msg_finish(s, &cbb)) 2623 goto err; 2624 2625 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2626 } 2627 2628 return (ssl3_handshake_write(s)); 2629 2630 err: 2631 CBB_cleanup(&cbb); 2632 2633 return (-1); 2634 } 2635 2636 int 2637 ssl3_send_client_certificate(SSL *s) 2638 { 2639 EVP_PKEY *pkey = NULL; 2640 X509 *x509 = NULL; 2641 CBB cbb, client_cert; 2642 int i; 2643 2644 memset(&cbb, 0, sizeof(cbb)); 2645 2646 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2647 if (s->cert->key->x509 == NULL || 2648 s->cert->key->privatekey == NULL) 2649 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2650 else 2651 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2652 } 2653 2654 /* We need to get a client cert */ 2655 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2656 /* 2657 * If we get an error, we need to 2658 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 2659 * We then get retied later 2660 */ 2661 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2662 if (i < 0) { 2663 s->internal->rwstate = SSL_X509_LOOKUP; 2664 return (-1); 2665 } 2666 s->internal->rwstate = SSL_NOTHING; 2667 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2668 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2669 if (!SSL_use_certificate(s, x509) || 2670 !SSL_use_PrivateKey(s, pkey)) 2671 i = 0; 2672 } else if (i == 1) { 2673 i = 0; 2674 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2675 } 2676 2677 X509_free(x509); 2678 EVP_PKEY_free(pkey); 2679 if (i == 0) { 2680 S3I(s)->tmp.cert_req = 2; 2681 2682 /* There is no client certificate to verify. */ 2683 tls1_transcript_free(s); 2684 } 2685 2686 /* Ok, we have a cert */ 2687 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2688 } 2689 2690 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2691 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2692 SSL3_MT_CERTIFICATE)) 2693 goto err; 2694 if (!ssl3_output_cert_chain(s, &client_cert, 2695 (S3I(s)->tmp.cert_req == 2) ? NULL : s->cert->key)) 2696 goto err; 2697 if (!ssl3_handshake_msg_finish(s, &cbb)) 2698 goto err; 2699 2700 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2701 } 2702 2703 /* SSL3_ST_CW_CERT_D */ 2704 return (ssl3_handshake_write(s)); 2705 2706 err: 2707 CBB_cleanup(&cbb); 2708 2709 return (0); 2710 } 2711 2712 #define has_bits(i,m) (((i)&(m)) == (m)) 2713 2714 int 2715 ssl3_check_cert_and_algorithm(SSL *s) 2716 { 2717 int i, idx; 2718 long alg_k, alg_a; 2719 EVP_PKEY *pkey = NULL; 2720 SESS_CERT *sc; 2721 DH *dh; 2722 2723 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2724 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 2725 2726 /* We don't have a certificate. */ 2727 if (alg_a & SSL_aNULL) 2728 return (1); 2729 2730 sc = SSI(s)->sess_cert; 2731 if (sc == NULL) { 2732 SSLerror(s, ERR_R_INTERNAL_ERROR); 2733 goto err; 2734 } 2735 dh = SSI(s)->sess_cert->peer_dh_tmp; 2736 2737 /* This is the passed certificate. */ 2738 2739 idx = sc->peer_cert_type; 2740 if (idx == SSL_PKEY_ECC) { 2741 if (ssl_check_srvr_ecc_cert_and_alg( 2742 sc->peer_pkeys[idx].x509, s) == 0) { 2743 /* check failed */ 2744 SSLerror(s, SSL_R_BAD_ECC_CERT); 2745 goto fatal_err; 2746 } else { 2747 return (1); 2748 } 2749 } 2750 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2751 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2752 EVP_PKEY_free(pkey); 2753 2754 /* Check that we have a certificate if we require one. */ 2755 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2756 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2757 goto fatal_err; 2758 } 2759 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2760 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2761 goto fatal_err; 2762 } 2763 if ((alg_k & SSL_kDHE) && 2764 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2765 SSLerror(s, SSL_R_MISSING_DH_KEY); 2766 goto fatal_err; 2767 } 2768 2769 return (1); 2770 fatal_err: 2771 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2772 err: 2773 return (0); 2774 } 2775 2776 /* 2777 * Check to see if handshake is full or resumed. Usually this is just a 2778 * case of checking to see if a cache hit has occurred. In the case of 2779 * session tickets we have to check the next message to be sure. 2780 */ 2781 2782 int 2783 ssl3_check_finished(SSL *s) 2784 { 2785 int ok; 2786 long n; 2787 2788 /* If we have no ticket it cannot be a resumed session. */ 2789 if (!s->session->tlsext_tick) 2790 return (1); 2791 /* this function is called when we really expect a Certificate 2792 * message, so permit appropriate message length */ 2793 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2794 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2795 if (!ok) 2796 return ((int)n); 2797 2798 S3I(s)->tmp.reuse_message = 1; 2799 if ((S3I(s)->tmp.message_type == SSL3_MT_FINISHED) || 2800 (S3I(s)->tmp.message_type == SSL3_MT_NEWSESSION_TICKET)) 2801 return (2); 2802 2803 return (1); 2804 } 2805 2806 int 2807 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2808 { 2809 int i = 0; 2810 2811 #ifndef OPENSSL_NO_ENGINE 2812 if (s->ctx->internal->client_cert_engine) { 2813 i = ENGINE_load_ssl_client_cert( 2814 s->ctx->internal->client_cert_engine, s, 2815 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2816 if (i != 0) 2817 return (i); 2818 } 2819 #endif 2820 if (s->ctx->internal->client_cert_cb) 2821 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2822 return (i); 2823 } 2824