1 /* $OpenBSD: ssl_clnt.c,v 1.84 2021/02/22 15:59:10 jsing 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_max_supported_version(s, &max_version)) { 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 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_check_version_from_server(s, server_version)) { 900 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 901 s->version = (s->version & 0xff00) | (server_version & 0xff); 902 al = SSL_AD_PROTOCOL_VERSION; 903 goto fatal_err; 904 } 905 s->version = server_version; 906 907 if ((method = ssl_get_method(server_version)) == NULL) { 908 SSLerror(s, ERR_R_INTERNAL_ERROR); 909 goto err; 910 } 911 s->method = method; 912 913 /* Server random. */ 914 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 915 goto decode_err; 916 if (!CBS_write_bytes(&server_random, s->s3->server_random, 917 sizeof(s->s3->server_random), NULL)) 918 goto err; 919 920 if (!ssl_downgrade_max_version(s, &max_version)) 921 goto err; 922 if (!SSL_is_dtls(s) && max_version >= TLS1_2_VERSION && 923 s->version < max_version) { 924 /* 925 * RFC 8446 section 4.1.3. We must not downgrade if the server 926 * random value contains the TLS 1.2 or TLS 1.1 magical value. 927 */ 928 if (!CBS_skip(&server_random, 929 CBS_len(&server_random) - sizeof(tls13_downgrade_12))) 930 goto err; 931 if (s->version == TLS1_2_VERSION && 932 CBS_mem_equal(&server_random, tls13_downgrade_12, 933 sizeof(tls13_downgrade_12))) { 934 al = SSL_AD_ILLEGAL_PARAMETER; 935 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 936 goto fatal_err; 937 } 938 if (CBS_mem_equal(&server_random, tls13_downgrade_11, 939 sizeof(tls13_downgrade_11))) { 940 al = SSL_AD_ILLEGAL_PARAMETER; 941 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 942 goto fatal_err; 943 } 944 } 945 946 /* Session ID. */ 947 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 948 goto decode_err; 949 950 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 951 al = SSL_AD_ILLEGAL_PARAMETER; 952 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 953 goto fatal_err; 954 } 955 956 /* Cipher suite. */ 957 if (!CBS_get_u16(&cbs, &cipher_suite)) 958 goto decode_err; 959 960 /* 961 * Check if we want to resume the session based on external 962 * pre-shared secret. 963 */ 964 if (s->internal->tls_session_secret_cb) { 965 SSL_CIPHER *pref_cipher = NULL; 966 s->session->master_key_length = sizeof(s->session->master_key); 967 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 968 &s->session->master_key_length, NULL, &pref_cipher, 969 s->internal->tls_session_secret_cb_arg)) { 970 s->session->cipher = pref_cipher ? pref_cipher : 971 ssl3_get_cipher_by_value(cipher_suite); 972 s->s3->flags |= SSL3_FLAGS_CCS_OK; 973 } 974 } 975 976 if (s->session->session_id_length != 0 && 977 CBS_mem_equal(&session_id, s->session->session_id, 978 s->session->session_id_length)) { 979 if (s->sid_ctx_length != s->session->sid_ctx_length || 980 timingsafe_memcmp(s->session->sid_ctx, 981 s->sid_ctx, s->sid_ctx_length) != 0) { 982 /* actually a client application bug */ 983 al = SSL_AD_ILLEGAL_PARAMETER; 984 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 985 goto fatal_err; 986 } 987 s->s3->flags |= SSL3_FLAGS_CCS_OK; 988 s->internal->hit = 1; 989 } else { 990 /* a miss or crap from the other end */ 991 992 /* If we were trying for session-id reuse, make a new 993 * SSL_SESSION so we don't stuff up other people */ 994 s->internal->hit = 0; 995 if (s->session->session_id_length > 0) { 996 if (!ssl_get_new_session(s, 0)) { 997 al = SSL_AD_INTERNAL_ERROR; 998 goto fatal_err; 999 } 1000 } 1001 1002 /* 1003 * XXX - improve the handling for the case where there is a 1004 * zero length session identifier. 1005 */ 1006 if (!CBS_write_bytes(&session_id, s->session->session_id, 1007 sizeof(s->session->session_id), &outlen)) 1008 goto err; 1009 s->session->session_id_length = outlen; 1010 1011 s->session->ssl_version = s->version; 1012 } 1013 1014 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 1015 al = SSL_AD_ILLEGAL_PARAMETER; 1016 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 1017 goto fatal_err; 1018 } 1019 1020 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 1021 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 1022 (TLS1_get_version(s) < TLS1_2_VERSION)) { 1023 al = SSL_AD_ILLEGAL_PARAMETER; 1024 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1025 goto fatal_err; 1026 } 1027 1028 if (!ssl_cipher_in_list(SSL_get_ciphers(s), cipher)) { 1029 /* we did not say we would use this cipher */ 1030 al = SSL_AD_ILLEGAL_PARAMETER; 1031 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1032 goto fatal_err; 1033 } 1034 1035 /* 1036 * Depending on the session caching (internal/external), the cipher 1037 * and/or cipher_id values may not be set. Make sure that 1038 * cipher_id is set and use it for comparison. 1039 */ 1040 if (s->session->cipher) 1041 s->session->cipher_id = s->session->cipher->id; 1042 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 1043 al = SSL_AD_ILLEGAL_PARAMETER; 1044 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1045 goto fatal_err; 1046 } 1047 S3I(s)->hs.new_cipher = cipher; 1048 1049 if (!tls1_transcript_hash_init(s)) 1050 goto err; 1051 1052 /* 1053 * Don't digest cached records if no sigalgs: we may need them for 1054 * client authentication. 1055 */ 1056 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1057 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST))) 1058 tls1_transcript_free(s); 1059 1060 if (!CBS_get_u8(&cbs, &compression_method)) 1061 goto decode_err; 1062 1063 if (compression_method != 0) { 1064 al = SSL_AD_ILLEGAL_PARAMETER; 1065 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1066 goto fatal_err; 1067 } 1068 1069 if (!tlsext_client_parse(s, SSL_TLSEXT_MSG_SH, &cbs, &al)) { 1070 SSLerror(s, SSL_R_PARSE_TLSEXT); 1071 goto fatal_err; 1072 } 1073 1074 /* 1075 * Determine if we need to see RI. Strictly speaking if we want to 1076 * avoid an attack we should *always* see RI even on initial server 1077 * hello because the client doesn't see any renegotiation during an 1078 * attack. However this would mean we could not connect to any server 1079 * which doesn't support RI so for the immediate future tolerate RI 1080 * absence on initial connect only. 1081 */ 1082 if (!S3I(s)->renegotiate_seen && 1083 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1084 al = SSL_AD_HANDSHAKE_FAILURE; 1085 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1086 goto fatal_err; 1087 } 1088 1089 if (ssl_check_serverhello_tlsext(s) <= 0) { 1090 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1091 goto err; 1092 } 1093 1094 return (1); 1095 1096 decode_err: 1097 /* wrong packet length */ 1098 al = SSL_AD_DECODE_ERROR; 1099 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1100 fatal_err: 1101 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1102 err: 1103 return (-1); 1104 } 1105 1106 int 1107 ssl3_get_server_certificate(SSL *s) 1108 { 1109 int al, i, ok, ret = -1; 1110 long n; 1111 CBS cbs, cert_list; 1112 X509 *x = NULL; 1113 const unsigned char *q; 1114 STACK_OF(X509) *sk = NULL; 1115 SESS_CERT *sc; 1116 EVP_PKEY *pkey = NULL; 1117 1118 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1119 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 1120 if (!ok) 1121 return ((int)n); 1122 1123 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1124 S3I(s)->tmp.reuse_message = 1; 1125 return (1); 1126 } 1127 1128 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 1129 al = SSL_AD_UNEXPECTED_MESSAGE; 1130 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1131 goto fatal_err; 1132 } 1133 1134 1135 if ((sk = sk_X509_new_null()) == NULL) { 1136 SSLerror(s, ERR_R_MALLOC_FAILURE); 1137 goto err; 1138 } 1139 1140 if (n < 0) 1141 goto decode_err; 1142 1143 CBS_init(&cbs, s->internal->init_msg, n); 1144 if (CBS_len(&cbs) < 3) 1145 goto decode_err; 1146 1147 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1148 CBS_len(&cbs) != 0) { 1149 al = SSL_AD_DECODE_ERROR; 1150 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1151 goto fatal_err; 1152 } 1153 1154 while (CBS_len(&cert_list) > 0) { 1155 CBS cert; 1156 1157 if (CBS_len(&cert_list) < 3) 1158 goto decode_err; 1159 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1160 al = SSL_AD_DECODE_ERROR; 1161 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1162 goto fatal_err; 1163 } 1164 1165 q = CBS_data(&cert); 1166 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1167 if (x == NULL) { 1168 al = SSL_AD_BAD_CERTIFICATE; 1169 SSLerror(s, ERR_R_ASN1_LIB); 1170 goto fatal_err; 1171 } 1172 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1173 al = SSL_AD_DECODE_ERROR; 1174 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1175 goto fatal_err; 1176 } 1177 if (!sk_X509_push(sk, x)) { 1178 SSLerror(s, ERR_R_MALLOC_FAILURE); 1179 goto err; 1180 } 1181 x = NULL; 1182 } 1183 1184 i = ssl_verify_cert_chain(s, sk); 1185 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1186 al = ssl_verify_alarm_type(s->verify_result); 1187 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1188 goto fatal_err; 1189 1190 } 1191 ERR_clear_error(); /* but we keep s->verify_result */ 1192 1193 sc = ssl_sess_cert_new(); 1194 if (sc == NULL) 1195 goto err; 1196 ssl_sess_cert_free(SSI(s)->sess_cert); 1197 SSI(s)->sess_cert = sc; 1198 1199 sc->cert_chain = sk; 1200 /* 1201 * Inconsistency alert: cert_chain does include the peer's 1202 * certificate, which we don't include in s3_srvr.c 1203 */ 1204 x = sk_X509_value(sk, 0); 1205 sk = NULL; 1206 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1207 1208 pkey = X509_get_pubkey(x); 1209 1210 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1211 x = NULL; 1212 al = SSL3_AL_FATAL; 1213 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1214 goto fatal_err; 1215 } 1216 1217 i = ssl_cert_type(x, pkey); 1218 if (i < 0) { 1219 x = NULL; 1220 al = SSL3_AL_FATAL; 1221 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1222 goto fatal_err; 1223 } 1224 1225 sc->peer_cert_type = i; 1226 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1227 /* 1228 * Why would the following ever happen? 1229 * We just created sc a couple of lines ago. 1230 */ 1231 X509_free(sc->peer_pkeys[i].x509); 1232 sc->peer_pkeys[i].x509 = x; 1233 sc->peer_key = &(sc->peer_pkeys[i]); 1234 1235 X509_free(s->session->peer); 1236 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1237 s->session->peer = x; 1238 s->session->verify_result = s->verify_result; 1239 1240 x = NULL; 1241 ret = 1; 1242 1243 if (0) { 1244 decode_err: 1245 /* wrong packet length */ 1246 al = SSL_AD_DECODE_ERROR; 1247 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1248 fatal_err: 1249 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1250 } 1251 err: 1252 EVP_PKEY_free(pkey); 1253 X509_free(x); 1254 sk_X509_pop_free(sk, X509_free); 1255 1256 return (ret); 1257 } 1258 1259 static int 1260 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1261 { 1262 CBS dhp, dhg, dhpk; 1263 BN_CTX *bn_ctx = NULL; 1264 SESS_CERT *sc = NULL; 1265 DH *dh = NULL; 1266 long alg_a; 1267 int al; 1268 1269 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1270 sc = SSI(s)->sess_cert; 1271 1272 if ((dh = DH_new()) == NULL) { 1273 SSLerror(s, ERR_R_DH_LIB); 1274 goto err; 1275 } 1276 1277 if (!CBS_get_u16_length_prefixed(cbs, &dhp)) 1278 goto decode_err; 1279 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1280 SSLerror(s, ERR_R_BN_LIB); 1281 goto err; 1282 } 1283 1284 if (!CBS_get_u16_length_prefixed(cbs, &dhg)) 1285 goto decode_err; 1286 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1287 SSLerror(s, ERR_R_BN_LIB); 1288 goto err; 1289 } 1290 1291 if (!CBS_get_u16_length_prefixed(cbs, &dhpk)) 1292 goto decode_err; 1293 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1294 NULL)) == NULL) { 1295 SSLerror(s, ERR_R_BN_LIB); 1296 goto err; 1297 } 1298 1299 /* 1300 * Check the strength of the DH key just constructed. 1301 * Discard keys weaker than 1024 bits. 1302 */ 1303 if (DH_size(dh) < 1024 / 8) { 1304 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1305 goto err; 1306 } 1307 1308 if (alg_a & SSL_aRSA) 1309 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1310 else 1311 /* XXX - Anonymous DH, so no certificate or pkey. */ 1312 *pkey = NULL; 1313 1314 sc->peer_dh_tmp = dh; 1315 1316 return (1); 1317 1318 decode_err: 1319 al = SSL_AD_DECODE_ERROR; 1320 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1321 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1322 1323 err: 1324 DH_free(dh); 1325 BN_CTX_free(bn_ctx); 1326 1327 return (-1); 1328 } 1329 1330 static int 1331 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1332 { 1333 EC_KEY *ecdh = NULL; 1334 int ret = -1; 1335 1336 /* Extract the server's ephemeral ECDH public key. */ 1337 if ((ecdh = EC_KEY_new()) == NULL) { 1338 SSLerror(s, ERR_R_MALLOC_FAILURE); 1339 goto err; 1340 } 1341 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh, nid, public)) { 1342 SSLerror(s, SSL_R_BAD_ECPOINT); 1343 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1344 goto err; 1345 } 1346 1347 sc->peer_nid = nid; 1348 sc->peer_ecdh_tmp = ecdh; 1349 ecdh = NULL; 1350 1351 ret = 1; 1352 1353 err: 1354 EC_KEY_free(ecdh); 1355 1356 return (ret); 1357 } 1358 1359 static int 1360 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1361 { 1362 size_t outlen; 1363 1364 if (nid != NID_X25519) { 1365 SSLerror(s, ERR_R_INTERNAL_ERROR); 1366 goto err; 1367 } 1368 1369 if (CBS_len(public) != X25519_KEY_LENGTH) { 1370 SSLerror(s, SSL_R_BAD_ECPOINT); 1371 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1372 goto err; 1373 } 1374 1375 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1376 SSLerror(s, ERR_R_MALLOC_FAILURE); 1377 goto err; 1378 } 1379 1380 return (1); 1381 1382 err: 1383 return (-1); 1384 } 1385 1386 static int 1387 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1388 { 1389 CBS public; 1390 uint8_t curve_type; 1391 uint16_t curve_id; 1392 SESS_CERT *sc; 1393 long alg_a; 1394 int nid; 1395 int al; 1396 1397 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1398 sc = SSI(s)->sess_cert; 1399 1400 /* Only named curves are supported. */ 1401 if (!CBS_get_u8(cbs, &curve_type) || 1402 curve_type != NAMED_CURVE_TYPE || 1403 !CBS_get_u16(cbs, &curve_id)) { 1404 al = SSL_AD_DECODE_ERROR; 1405 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1406 goto fatal_err; 1407 } 1408 1409 /* 1410 * Check that the curve is one of our preferences - if it is not, 1411 * the server has sent us an invalid curve. 1412 */ 1413 if (tls1_check_curve(s, curve_id) != 1) { 1414 al = SSL_AD_DECODE_ERROR; 1415 SSLerror(s, SSL_R_WRONG_CURVE); 1416 goto fatal_err; 1417 } 1418 1419 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1420 al = SSL_AD_INTERNAL_ERROR; 1421 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1422 goto fatal_err; 1423 } 1424 1425 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1426 goto decode_err; 1427 1428 if (nid == NID_X25519) { 1429 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1430 goto err; 1431 } else { 1432 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1433 goto err; 1434 } 1435 1436 /* 1437 * The ECC/TLS specification does not mention the use of DSA to sign 1438 * ECParameters in the server key exchange message. We do support RSA 1439 * and ECDSA. 1440 */ 1441 if (alg_a & SSL_aRSA) 1442 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1443 else if (alg_a & SSL_aECDSA) 1444 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1445 else 1446 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1447 *pkey = NULL; 1448 1449 return (1); 1450 1451 decode_err: 1452 al = SSL_AD_DECODE_ERROR; 1453 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1454 1455 fatal_err: 1456 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1457 1458 err: 1459 return (-1); 1460 } 1461 1462 int 1463 ssl3_get_server_key_exchange(SSL *s) 1464 { 1465 CBS cbs, signature; 1466 const EVP_MD *md = NULL; 1467 EVP_PKEY *pkey = NULL; 1468 EVP_MD_CTX md_ctx; 1469 const unsigned char *param; 1470 long n, alg_k, alg_a; 1471 int al, ok; 1472 size_t param_len; 1473 1474 EVP_MD_CTX_init(&md_ctx); 1475 1476 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1477 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1478 1479 /* 1480 * Use same message size as in ssl3_get_certificate_request() 1481 * as ServerKeyExchange message may be skipped. 1482 */ 1483 n = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1484 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1485 if (!ok) 1486 return ((int)n); 1487 1488 if (n < 0) 1489 goto err; 1490 1491 CBS_init(&cbs, s->internal->init_msg, n); 1492 1493 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1494 /* 1495 * Do not skip server key exchange if this cipher suite uses 1496 * ephemeral keys. 1497 */ 1498 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1499 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1500 al = SSL_AD_UNEXPECTED_MESSAGE; 1501 goto fatal_err; 1502 } 1503 1504 S3I(s)->tmp.reuse_message = 1; 1505 EVP_MD_CTX_cleanup(&md_ctx); 1506 return (1); 1507 } 1508 1509 if (SSI(s)->sess_cert != NULL) { 1510 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1511 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1512 1513 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1514 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1515 1516 free(SSI(s)->sess_cert->peer_x25519_tmp); 1517 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1518 } else { 1519 SSI(s)->sess_cert = ssl_sess_cert_new(); 1520 if (SSI(s)->sess_cert == NULL) 1521 goto err; 1522 } 1523 1524 param = CBS_data(&cbs); 1525 param_len = CBS_len(&cbs); 1526 1527 if (alg_k & SSL_kDHE) { 1528 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1) 1529 goto err; 1530 } else if (alg_k & SSL_kECDHE) { 1531 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1) 1532 goto err; 1533 } else if (alg_k != 0) { 1534 al = SSL_AD_UNEXPECTED_MESSAGE; 1535 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1536 goto fatal_err; 1537 } 1538 1539 param_len -= CBS_len(&cbs); 1540 1541 /* if it was signed, check the signature */ 1542 if (pkey != NULL) { 1543 EVP_PKEY_CTX *pctx; 1544 const struct ssl_sigalg *sigalg; 1545 1546 if (SSL_USE_SIGALGS(s)) { 1547 uint16_t sigalg_value; 1548 1549 if (!CBS_get_u16(&cbs, &sigalg_value)) 1550 goto decode_err; 1551 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, 1552 tls12_sigalgs_len)) == NULL) { 1553 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1554 al = SSL_AD_DECODE_ERROR; 1555 goto fatal_err; 1556 } 1557 if ((md = sigalg->md()) == NULL) { 1558 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1559 al = SSL_AD_DECODE_ERROR; 1560 goto fatal_err; 1561 } 1562 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) { 1563 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 1564 al = SSL_AD_DECODE_ERROR; 1565 goto fatal_err; 1566 } 1567 } else if (pkey->type == EVP_PKEY_RSA) { 1568 sigalg = ssl_sigalg_lookup(SIGALG_RSA_PKCS1_MD5_SHA1); 1569 } else if (pkey->type == EVP_PKEY_EC) { 1570 sigalg = ssl_sigalg_lookup(SIGALG_ECDSA_SHA1); 1571 } else { 1572 SSLerror(s, SSL_R_UNKNOWN_PKEY_TYPE); 1573 al = SSL_AD_DECODE_ERROR; 1574 goto fatal_err; 1575 } 1576 md = sigalg->md(); 1577 1578 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1579 goto decode_err; 1580 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1581 al = SSL_AD_DECODE_ERROR; 1582 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1583 goto fatal_err; 1584 } 1585 1586 if (!EVP_DigestVerifyInit(&md_ctx, &pctx, md, NULL, pkey)) 1587 goto err; 1588 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->client_random, 1589 SSL3_RANDOM_SIZE)) 1590 goto err; 1591 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1592 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1593 RSA_PKCS1_PSS_PADDING) || 1594 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1595 goto err; 1596 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->server_random, 1597 SSL3_RANDOM_SIZE)) 1598 goto err; 1599 if (!EVP_DigestVerifyUpdate(&md_ctx, param, param_len)) 1600 goto err; 1601 if (EVP_DigestVerifyFinal(&md_ctx, CBS_data(&signature), 1602 CBS_len(&signature)) <= 0) { 1603 al = SSL_AD_DECRYPT_ERROR; 1604 SSLerror(s, SSL_R_BAD_SIGNATURE); 1605 goto fatal_err; 1606 } 1607 } else { 1608 /* aNULL does not need public keys. */ 1609 if (!(alg_a & SSL_aNULL)) { 1610 SSLerror(s, ERR_R_INTERNAL_ERROR); 1611 goto err; 1612 } 1613 } 1614 1615 if (CBS_len(&cbs) != 0) { 1616 al = SSL_AD_DECODE_ERROR; 1617 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1618 goto fatal_err; 1619 } 1620 1621 EVP_PKEY_free(pkey); 1622 EVP_MD_CTX_cleanup(&md_ctx); 1623 1624 return (1); 1625 1626 decode_err: 1627 al = SSL_AD_DECODE_ERROR; 1628 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1629 1630 fatal_err: 1631 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1632 1633 err: 1634 EVP_PKEY_free(pkey); 1635 EVP_MD_CTX_cleanup(&md_ctx); 1636 1637 return (-1); 1638 } 1639 1640 int 1641 ssl3_get_certificate_request(SSL *s) 1642 { 1643 int ok, ret = 0; 1644 long n; 1645 uint8_t ctype_num; 1646 CBS cert_request, ctypes, rdn_list; 1647 X509_NAME *xn = NULL; 1648 const unsigned char *q; 1649 STACK_OF(X509_NAME) *ca_sk = NULL; 1650 1651 n = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1652 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1653 if (!ok) 1654 return ((int)n); 1655 1656 S3I(s)->tmp.cert_req = 0; 1657 1658 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_DONE) { 1659 S3I(s)->tmp.reuse_message = 1; 1660 /* 1661 * If we get here we don't need any cached handshake records 1662 * as we wont be doing client auth. 1663 */ 1664 tls1_transcript_free(s); 1665 return (1); 1666 } 1667 1668 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1669 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1670 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1671 goto err; 1672 } 1673 1674 /* TLS does not like anon-DH with client cert */ 1675 if (S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL) { 1676 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1677 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1678 goto err; 1679 } 1680 1681 if (n < 0) 1682 goto decode_err; 1683 CBS_init(&cert_request, s->internal->init_msg, n); 1684 1685 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1686 SSLerror(s, ERR_R_MALLOC_FAILURE); 1687 goto err; 1688 } 1689 1690 /* get the certificate types */ 1691 if (!CBS_get_u8(&cert_request, &ctype_num)) 1692 goto decode_err; 1693 1694 if (ctype_num > SSL3_CT_NUMBER) 1695 ctype_num = SSL3_CT_NUMBER; 1696 if (!CBS_get_bytes(&cert_request, &ctypes, ctype_num) || 1697 !CBS_write_bytes(&ctypes, (uint8_t *)S3I(s)->tmp.ctype, 1698 sizeof(S3I(s)->tmp.ctype), NULL)) { 1699 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1700 goto err; 1701 } 1702 1703 if (SSL_USE_SIGALGS(s)) { 1704 CBS sigalgs; 1705 1706 if (CBS_len(&cert_request) < 2) { 1707 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1708 goto err; 1709 } 1710 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1711 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1712 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1713 goto err; 1714 } 1715 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1716 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1717 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1718 goto err; 1719 } 1720 if (!CBS_stow(&sigalgs, &S3I(s)->hs.sigalgs, 1721 &S3I(s)->hs.sigalgs_len)) 1722 goto err; 1723 } 1724 1725 /* get the CA RDNs */ 1726 if (CBS_len(&cert_request) < 2) { 1727 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1728 goto err; 1729 } 1730 1731 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1732 CBS_len(&cert_request) != 0) { 1733 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1734 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1735 goto err; 1736 } 1737 1738 while (CBS_len(&rdn_list) > 0) { 1739 CBS rdn; 1740 1741 if (CBS_len(&rdn_list) < 2) { 1742 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1743 goto err; 1744 } 1745 1746 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1747 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1748 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1749 goto err; 1750 } 1751 1752 q = CBS_data(&rdn); 1753 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1754 ssl3_send_alert(s, SSL3_AL_FATAL, 1755 SSL_AD_DECODE_ERROR); 1756 SSLerror(s, ERR_R_ASN1_LIB); 1757 goto err; 1758 } 1759 1760 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1761 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1762 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1763 goto err; 1764 } 1765 if (!sk_X509_NAME_push(ca_sk, xn)) { 1766 SSLerror(s, ERR_R_MALLOC_FAILURE); 1767 goto err; 1768 } 1769 xn = NULL; /* avoid free in err block */ 1770 } 1771 1772 /* we should setup a certificate to return.... */ 1773 S3I(s)->tmp.cert_req = 1; 1774 S3I(s)->tmp.ctype_num = ctype_num; 1775 sk_X509_NAME_pop_free(S3I(s)->tmp.ca_names, X509_NAME_free); 1776 S3I(s)->tmp.ca_names = ca_sk; 1777 ca_sk = NULL; 1778 1779 ret = 1; 1780 if (0) { 1781 decode_err: 1782 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1783 } 1784 err: 1785 X509_NAME_free(xn); 1786 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1787 return (ret); 1788 } 1789 1790 static int 1791 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1792 { 1793 return (X509_NAME_cmp(*a, *b)); 1794 } 1795 1796 int 1797 ssl3_get_new_session_ticket(SSL *s) 1798 { 1799 int ok, al, ret = 0; 1800 uint32_t lifetime_hint; 1801 long n; 1802 CBS cbs, session_ticket; 1803 1804 n = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1805 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1806 if (!ok) 1807 return ((int)n); 1808 1809 if (S3I(s)->tmp.message_type == SSL3_MT_FINISHED) { 1810 S3I(s)->tmp.reuse_message = 1; 1811 return (1); 1812 } 1813 if (S3I(s)->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) { 1814 al = SSL_AD_UNEXPECTED_MESSAGE; 1815 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1816 goto fatal_err; 1817 } 1818 1819 if (n < 0) { 1820 al = SSL_AD_DECODE_ERROR; 1821 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1822 goto fatal_err; 1823 } 1824 1825 CBS_init(&cbs, s->internal->init_msg, n); 1826 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1827 #if UINT32_MAX > LONG_MAX 1828 lifetime_hint > LONG_MAX || 1829 #endif 1830 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1831 CBS_len(&cbs) != 0) { 1832 al = SSL_AD_DECODE_ERROR; 1833 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1834 goto fatal_err; 1835 } 1836 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1837 1838 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1839 &s->session->tlsext_ticklen)) { 1840 SSLerror(s, ERR_R_MALLOC_FAILURE); 1841 goto err; 1842 } 1843 1844 /* 1845 * There are two ways to detect a resumed ticket sesion. 1846 * One is to set an appropriate session ID and then the server 1847 * must return a match in ServerHello. This allows the normal 1848 * client session ID matching to work and we know much 1849 * earlier that the ticket has been accepted. 1850 * 1851 * The other way is to set zero length session ID when the 1852 * ticket is presented and rely on the handshake to determine 1853 * session resumption. 1854 * 1855 * We choose the former approach because this fits in with 1856 * assumptions elsewhere in OpenSSL. The session ID is set 1857 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1858 * ticket. 1859 */ 1860 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1861 s->session->session_id, &s->session->session_id_length, 1862 EVP_sha256(), NULL); 1863 ret = 1; 1864 return (ret); 1865 fatal_err: 1866 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1867 err: 1868 return (-1); 1869 } 1870 1871 int 1872 ssl3_get_cert_status(SSL *s) 1873 { 1874 CBS cert_status, response; 1875 int ok, al; 1876 long n; 1877 uint8_t status_type; 1878 1879 n = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1880 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 1881 16384, &ok); 1882 if (!ok) 1883 return ((int)n); 1884 1885 if (n < 0) { 1886 /* need at least status type + length */ 1887 al = SSL_AD_DECODE_ERROR; 1888 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1889 goto fatal_err; 1890 } 1891 1892 CBS_init(&cert_status, s->internal->init_msg, n); 1893 if (!CBS_get_u8(&cert_status, &status_type) || 1894 CBS_len(&cert_status) < 3) { 1895 /* need at least status type + length */ 1896 al = SSL_AD_DECODE_ERROR; 1897 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1898 goto fatal_err; 1899 } 1900 1901 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1902 al = SSL_AD_DECODE_ERROR; 1903 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1904 goto fatal_err; 1905 } 1906 1907 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1908 CBS_len(&cert_status) != 0) { 1909 al = SSL_AD_DECODE_ERROR; 1910 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1911 goto fatal_err; 1912 } 1913 1914 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1915 &s->internal->tlsext_ocsp_resp_len)) { 1916 al = SSL_AD_INTERNAL_ERROR; 1917 SSLerror(s, ERR_R_MALLOC_FAILURE); 1918 goto fatal_err; 1919 } 1920 1921 if (s->ctx->internal->tlsext_status_cb) { 1922 int ret; 1923 ret = s->ctx->internal->tlsext_status_cb(s, 1924 s->ctx->internal->tlsext_status_arg); 1925 if (ret == 0) { 1926 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1927 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1928 goto fatal_err; 1929 } 1930 if (ret < 0) { 1931 al = SSL_AD_INTERNAL_ERROR; 1932 SSLerror(s, ERR_R_MALLOC_FAILURE); 1933 goto fatal_err; 1934 } 1935 } 1936 return (1); 1937 fatal_err: 1938 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1939 return (-1); 1940 } 1941 1942 int 1943 ssl3_get_server_done(SSL *s) 1944 { 1945 int ok, ret = 0; 1946 long n; 1947 1948 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1949 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1950 30, /* should be very small, like 0 :-) */ &ok); 1951 if (!ok) 1952 return ((int)n); 1953 1954 if (n > 0) { 1955 /* should contain no data */ 1956 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1957 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1958 return (-1); 1959 } 1960 ret = 1; 1961 return (ret); 1962 } 1963 1964 static int 1965 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1966 { 1967 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1968 unsigned char *enc_pms = NULL; 1969 EVP_PKEY *pkey = NULL; 1970 int ret = -1; 1971 int enc_len; 1972 CBB epms; 1973 1974 /* 1975 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1976 */ 1977 1978 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA].x509); 1979 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1980 pkey->pkey.rsa == NULL) { 1981 SSLerror(s, ERR_R_INTERNAL_ERROR); 1982 goto err; 1983 } 1984 1985 pms[0] = s->client_version >> 8; 1986 pms[1] = s->client_version & 0xff; 1987 arc4random_buf(&pms[2], sizeof(pms) - 2); 1988 1989 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1990 SSLerror(s, ERR_R_MALLOC_FAILURE); 1991 goto err; 1992 } 1993 1994 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 1995 RSA_PKCS1_PADDING); 1996 if (enc_len <= 0) { 1997 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1998 goto err; 1999 } 2000 2001 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 2002 goto err; 2003 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 2004 goto err; 2005 if (!CBB_flush(cbb)) 2006 goto err; 2007 2008 s->session->master_key_length = 2009 tls1_generate_master_secret(s, 2010 s->session->master_key, pms, sizeof(pms)); 2011 2012 ret = 1; 2013 2014 err: 2015 explicit_bzero(pms, sizeof(pms)); 2016 EVP_PKEY_free(pkey); 2017 free(enc_pms); 2018 2019 return (ret); 2020 } 2021 2022 static int 2023 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2024 { 2025 DH *dh_srvr = NULL, *dh_clnt = NULL; 2026 unsigned char *key = NULL; 2027 int key_size = 0, key_len; 2028 unsigned char *data; 2029 int ret = -1; 2030 CBB dh_Yc; 2031 2032 /* Ensure that we have an ephemeral key for DHE. */ 2033 if (sess_cert->peer_dh_tmp == NULL) { 2034 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2035 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 2036 goto err; 2037 } 2038 dh_srvr = sess_cert->peer_dh_tmp; 2039 2040 /* Generate a new random key. */ 2041 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2042 SSLerror(s, ERR_R_DH_LIB); 2043 goto err; 2044 } 2045 if (!DH_generate_key(dh_clnt)) { 2046 SSLerror(s, ERR_R_DH_LIB); 2047 goto err; 2048 } 2049 if ((key_size = DH_size(dh_clnt)) <= 0) { 2050 SSLerror(s, ERR_R_DH_LIB); 2051 goto err; 2052 } 2053 if ((key = malloc(key_size)) == NULL) { 2054 SSLerror(s, ERR_R_MALLOC_FAILURE); 2055 goto err; 2056 } 2057 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) { 2058 SSLerror(s, ERR_R_DH_LIB); 2059 goto err; 2060 } 2061 2062 /* Generate master key from the result. */ 2063 s->session->master_key_length = 2064 tls1_generate_master_secret(s, 2065 s->session->master_key, key, key_len); 2066 2067 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2068 goto err; 2069 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2070 goto err; 2071 BN_bn2bin(dh_clnt->pub_key, data); 2072 if (!CBB_flush(cbb)) 2073 goto err; 2074 2075 ret = 1; 2076 2077 err: 2078 DH_free(dh_clnt); 2079 freezero(key, key_size); 2080 2081 return (ret); 2082 } 2083 2084 static int 2085 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2086 { 2087 EC_KEY *ecdh = NULL; 2088 uint8_t *key = NULL; 2089 size_t key_len = 0; 2090 int ret = -1; 2091 CBB ecpoint; 2092 2093 if ((ecdh = EC_KEY_new()) == NULL) { 2094 SSLerror(s, ERR_R_MALLOC_FAILURE); 2095 goto err; 2096 } 2097 2098 if (!ssl_kex_generate_ecdhe_ecp(ecdh, sc->peer_nid)) 2099 goto err; 2100 2101 /* Encode our public key. */ 2102 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2103 goto err; 2104 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 2105 goto err; 2106 if (!CBB_flush(cbb)) 2107 goto err; 2108 2109 if (!ssl_kex_derive_ecdhe_ecp(ecdh, sc->peer_ecdh_tmp, &key, &key_len)) 2110 goto err; 2111 s->session->master_key_length = tls1_generate_master_secret(s, 2112 s->session->master_key, key, key_len); 2113 2114 ret = 1; 2115 2116 err: 2117 freezero(key, key_len); 2118 EC_KEY_free(ecdh); 2119 2120 return (ret); 2121 } 2122 2123 static int 2124 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2125 { 2126 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2127 int ret = -1; 2128 CBB ecpoint; 2129 2130 /* Generate X25519 key pair and derive shared key. */ 2131 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2132 goto err; 2133 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2134 goto err; 2135 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2136 goto err; 2137 X25519_keypair(public_key, private_key); 2138 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2139 goto err; 2140 2141 /* Serialize the public key. */ 2142 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2143 goto err; 2144 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2145 goto err; 2146 if (!CBB_flush(cbb)) 2147 goto err; 2148 2149 /* Generate master key from the result. */ 2150 s->session->master_key_length = 2151 tls1_generate_master_secret(s, 2152 s->session->master_key, shared_key, X25519_KEY_LENGTH); 2153 2154 ret = 1; 2155 2156 err: 2157 free(public_key); 2158 freezero(private_key, X25519_KEY_LENGTH); 2159 freezero(shared_key, X25519_KEY_LENGTH); 2160 2161 return (ret); 2162 } 2163 2164 static int 2165 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2166 { 2167 if (sc->peer_x25519_tmp != NULL) { 2168 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2169 goto err; 2170 } else if (sc->peer_ecdh_tmp != NULL) { 2171 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2172 goto err; 2173 } else { 2174 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2175 SSLerror(s, ERR_R_INTERNAL_ERROR); 2176 goto err; 2177 } 2178 2179 return (1); 2180 2181 err: 2182 return (-1); 2183 } 2184 2185 static int 2186 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2187 { 2188 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2189 EVP_PKEY *pub_key = NULL; 2190 EVP_PKEY_CTX *pkey_ctx; 2191 X509 *peer_cert; 2192 size_t msglen; 2193 unsigned int md_len; 2194 EVP_MD_CTX *ukm_hash; 2195 int ret = -1; 2196 int nid; 2197 CBB gostblob; 2198 2199 /* Get server sertificate PKEY and create ctx from it */ 2200 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2201 if (peer_cert == NULL) { 2202 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2203 goto err; 2204 } 2205 2206 pub_key = X509_get_pubkey(peer_cert); 2207 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2208 2209 /* 2210 * If we have send a certificate, and certificate key parameters match 2211 * those of server certificate, use certificate key for key exchange. 2212 * Otherwise, generate ephemeral key pair. 2213 */ 2214 EVP_PKEY_encrypt_init(pkey_ctx); 2215 2216 /* Generate session key. */ 2217 arc4random_buf(premaster_secret, 32); 2218 2219 /* 2220 * If we have client certificate, use its secret as peer key. 2221 */ 2222 if (S3I(s)->tmp.cert_req && s->cert->key->privatekey) { 2223 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2224 s->cert->key->privatekey) <=0) { 2225 /* 2226 * If there was an error - just ignore it. 2227 * Ephemeral key would be used. 2228 */ 2229 ERR_clear_error(); 2230 } 2231 } 2232 2233 /* 2234 * Compute shared IV and store it in algorithm-specific context data. 2235 */ 2236 ukm_hash = EVP_MD_CTX_new(); 2237 if (ukm_hash == NULL) { 2238 SSLerror(s, ERR_R_MALLOC_FAILURE); 2239 goto err; 2240 } 2241 2242 /* XXX check handshake hash instead. */ 2243 if (S3I(s)->hs.new_cipher->algorithm2 & SSL_HANDSHAKE_MAC_GOST94) 2244 nid = NID_id_GostR3411_94; 2245 else 2246 nid = NID_id_tc26_gost3411_2012_256; 2247 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2248 goto err; 2249 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2250 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2251 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2252 EVP_MD_CTX_free(ukm_hash); 2253 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2254 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2255 SSLerror(s, SSL_R_LIBRARY_BUG); 2256 goto err; 2257 } 2258 2259 /* 2260 * Make GOST keytransport blob message, encapsulate it into sequence. 2261 */ 2262 msglen = 255; 2263 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2264 32) < 0) { 2265 SSLerror(s, SSL_R_LIBRARY_BUG); 2266 goto err; 2267 } 2268 2269 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2270 goto err; 2271 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2272 goto err; 2273 if (!CBB_flush(cbb)) 2274 goto err; 2275 2276 /* Check if pubkey from client certificate was used. */ 2277 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2278 NULL) > 0) { 2279 /* Set flag "skip certificate verify". */ 2280 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2281 } 2282 EVP_PKEY_CTX_free(pkey_ctx); 2283 s->session->master_key_length = 2284 tls1_generate_master_secret(s, 2285 s->session->master_key, premaster_secret, 32); 2286 2287 ret = 1; 2288 2289 err: 2290 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2291 EVP_PKEY_free(pub_key); 2292 2293 return (ret); 2294 } 2295 2296 int 2297 ssl3_send_client_key_exchange(SSL *s) 2298 { 2299 SESS_CERT *sess_cert; 2300 unsigned long alg_k; 2301 CBB cbb, kex; 2302 2303 memset(&cbb, 0, sizeof(cbb)); 2304 2305 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2306 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2307 2308 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2309 ssl3_send_alert(s, SSL3_AL_FATAL, 2310 SSL_AD_UNEXPECTED_MESSAGE); 2311 SSLerror(s, ERR_R_INTERNAL_ERROR); 2312 goto err; 2313 } 2314 2315 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2316 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2317 goto err; 2318 2319 if (alg_k & SSL_kRSA) { 2320 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2321 goto err; 2322 } else if (alg_k & SSL_kDHE) { 2323 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2324 goto err; 2325 } else if (alg_k & SSL_kECDHE) { 2326 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2327 goto err; 2328 } else if (alg_k & SSL_kGOST) { 2329 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2330 goto err; 2331 } else { 2332 ssl3_send_alert(s, SSL3_AL_FATAL, 2333 SSL_AD_HANDSHAKE_FAILURE); 2334 SSLerror(s, ERR_R_INTERNAL_ERROR); 2335 goto err; 2336 } 2337 2338 if (!ssl3_handshake_msg_finish(s, &cbb)) 2339 goto err; 2340 2341 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2342 } 2343 2344 /* SSL3_ST_CW_KEY_EXCH_B */ 2345 return (ssl3_handshake_write(s)); 2346 2347 err: 2348 CBB_cleanup(&cbb); 2349 2350 return (-1); 2351 } 2352 2353 static int 2354 ssl3_send_client_verify_sigalgs(SSL *s, CBB *cert_verify) 2355 { 2356 const struct ssl_sigalg *sigalg; 2357 CBB cbb_signature; 2358 EVP_PKEY_CTX *pctx = NULL; 2359 EVP_PKEY *pkey; 2360 EVP_MD_CTX mctx; 2361 const EVP_MD *md; 2362 const unsigned char *hdata; 2363 unsigned char *signature = NULL; 2364 size_t signature_len, hdata_len; 2365 int ret = 0; 2366 2367 EVP_MD_CTX_init(&mctx); 2368 2369 pkey = s->cert->key->privatekey; 2370 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2371 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2372 goto err; 2373 } 2374 if ((md = sigalg->md()) == NULL) { 2375 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 2376 goto err; 2377 } 2378 2379 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2380 SSLerror(s, ERR_R_INTERNAL_ERROR); 2381 goto err; 2382 } 2383 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2384 SSLerror(s, ERR_R_EVP_LIB); 2385 goto err; 2386 } 2387 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2388 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2389 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2390 SSLerror(s, ERR_R_EVP_LIB); 2391 goto err; 2392 } 2393 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2394 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2395 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2396 SSLerror(s, ERR_R_EVP_LIB); 2397 goto err; 2398 } 2399 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2400 SSLerror(s, ERR_R_EVP_LIB); 2401 goto err; 2402 } 2403 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2404 signature_len == 0) { 2405 SSLerror(s, ERR_R_EVP_LIB); 2406 goto err; 2407 } 2408 if ((signature = calloc(1, signature_len)) == NULL) { 2409 SSLerror(s, ERR_R_MALLOC_FAILURE); 2410 goto err; 2411 } 2412 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2413 SSLerror(s, ERR_R_EVP_LIB); 2414 goto err; 2415 } 2416 2417 if (!CBB_add_u16(cert_verify, sigalg->value)) 2418 goto err; 2419 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2420 goto err; 2421 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2422 goto err; 2423 if (!CBB_flush(cert_verify)) 2424 goto err; 2425 2426 ret = 1; 2427 2428 err: 2429 EVP_MD_CTX_cleanup(&mctx); 2430 free(signature); 2431 return ret; 2432 } 2433 2434 static int 2435 ssl3_send_client_verify_rsa(SSL *s, CBB *cert_verify) 2436 { 2437 CBB cbb_signature; 2438 EVP_PKEY *pkey; 2439 unsigned char data[EVP_MAX_MD_SIZE]; 2440 unsigned char *signature = NULL; 2441 unsigned int signature_len; 2442 size_t data_len; 2443 int ret = 0; 2444 2445 pkey = s->cert->key->privatekey; 2446 2447 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2448 goto err; 2449 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2450 goto err; 2451 if (RSA_sign(NID_md5_sha1, data, data_len, signature, 2452 &signature_len, pkey->pkey.rsa) <= 0 ) { 2453 SSLerror(s, ERR_R_RSA_LIB); 2454 goto err; 2455 } 2456 2457 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2458 goto err; 2459 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2460 goto err; 2461 if (!CBB_flush(cert_verify)) 2462 goto err; 2463 2464 ret = 1; 2465 err: 2466 free(signature); 2467 return ret; 2468 } 2469 2470 static int 2471 ssl3_send_client_verify_ec(SSL *s, CBB *cert_verify) 2472 { 2473 CBB cbb_signature; 2474 EVP_PKEY *pkey; 2475 unsigned char data[EVP_MAX_MD_SIZE]; 2476 unsigned char *signature = NULL; 2477 unsigned int signature_len; 2478 int ret = 0; 2479 2480 pkey = s->cert->key->privatekey; 2481 2482 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2483 goto err; 2484 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2485 goto err; 2486 if (!ECDSA_sign(pkey->save_type, &data[MD5_DIGEST_LENGTH], 2487 SHA_DIGEST_LENGTH, signature, &signature_len, pkey->pkey.ec)) { 2488 SSLerror(s, ERR_R_ECDSA_LIB); 2489 goto err; 2490 } 2491 2492 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2493 goto err; 2494 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2495 goto err; 2496 if (!CBB_flush(cert_verify)) 2497 goto err; 2498 2499 ret = 1; 2500 err: 2501 free(signature); 2502 return ret; 2503 } 2504 2505 #ifndef OPENSSL_NO_GOST 2506 static int 2507 ssl3_send_client_verify_gost(SSL *s, CBB *cert_verify) 2508 { 2509 CBB cbb_signature; 2510 EVP_MD_CTX mctx; 2511 EVP_PKEY_CTX *pctx; 2512 EVP_PKEY *pkey; 2513 const EVP_MD *md; 2514 const unsigned char *hdata; 2515 unsigned char *signature = NULL; 2516 size_t signature_len; 2517 size_t hdata_len; 2518 int nid; 2519 int ret = 0; 2520 2521 EVP_MD_CTX_init(&mctx); 2522 2523 pkey = s->cert->key->privatekey; 2524 2525 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2526 SSLerror(s, ERR_R_INTERNAL_ERROR); 2527 goto err; 2528 } 2529 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2530 (md = EVP_get_digestbynid(nid)) == NULL) { 2531 SSLerror(s, ERR_R_EVP_LIB); 2532 goto err; 2533 } 2534 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2535 SSLerror(s, ERR_R_EVP_LIB); 2536 goto err; 2537 } 2538 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2539 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2540 SSLerror(s, ERR_R_EVP_LIB); 2541 goto err; 2542 } 2543 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2544 SSLerror(s, ERR_R_EVP_LIB); 2545 goto err; 2546 } 2547 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2548 signature_len == 0) { 2549 SSLerror(s, ERR_R_EVP_LIB); 2550 goto err; 2551 } 2552 if ((signature = calloc(1, signature_len)) == NULL) { 2553 SSLerror(s, ERR_R_MALLOC_FAILURE); 2554 goto err; 2555 } 2556 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2557 SSLerror(s, ERR_R_EVP_LIB); 2558 goto err; 2559 } 2560 2561 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2562 goto err; 2563 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2564 goto err; 2565 if (!CBB_flush(cert_verify)) 2566 goto err; 2567 2568 ret = 1; 2569 err: 2570 EVP_MD_CTX_cleanup(&mctx); 2571 free(signature); 2572 return ret; 2573 } 2574 #endif 2575 2576 int 2577 ssl3_send_client_verify(SSL *s) 2578 { 2579 CBB cbb, cert_verify; 2580 EVP_PKEY *pkey; 2581 2582 memset(&cbb, 0, sizeof(cbb)); 2583 2584 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2585 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2586 SSL3_MT_CERTIFICATE_VERIFY)) 2587 goto err; 2588 2589 pkey = s->cert->key->privatekey; 2590 2591 /* 2592 * For TLS v1.2 send signature algorithm and signature 2593 * using agreed digest and cached handshake records. 2594 */ 2595 if (SSL_USE_SIGALGS(s)) { 2596 if (!ssl3_send_client_verify_sigalgs(s, &cert_verify)) 2597 goto err; 2598 } else if (pkey->type == EVP_PKEY_RSA) { 2599 if (!ssl3_send_client_verify_rsa(s, &cert_verify)) 2600 goto err; 2601 } else if (pkey->type == EVP_PKEY_EC) { 2602 if (!ssl3_send_client_verify_ec(s, &cert_verify)) 2603 goto err; 2604 #ifndef OPENSSL_NO_GOST 2605 } else if (pkey->type == NID_id_GostR3410_94 || 2606 pkey->type == NID_id_GostR3410_2001) { 2607 if (!ssl3_send_client_verify_gost(s, &cert_verify)) 2608 goto err; 2609 #endif 2610 } else { 2611 SSLerror(s, ERR_R_INTERNAL_ERROR); 2612 goto err; 2613 } 2614 2615 tls1_transcript_free(s); 2616 2617 if (!ssl3_handshake_msg_finish(s, &cbb)) 2618 goto err; 2619 2620 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2621 } 2622 2623 return (ssl3_handshake_write(s)); 2624 2625 err: 2626 CBB_cleanup(&cbb); 2627 2628 return (-1); 2629 } 2630 2631 int 2632 ssl3_send_client_certificate(SSL *s) 2633 { 2634 EVP_PKEY *pkey = NULL; 2635 X509 *x509 = NULL; 2636 CBB cbb, client_cert; 2637 int i; 2638 2639 memset(&cbb, 0, sizeof(cbb)); 2640 2641 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2642 if (s->cert->key->x509 == NULL || 2643 s->cert->key->privatekey == NULL) 2644 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2645 else 2646 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2647 } 2648 2649 /* We need to get a client cert */ 2650 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2651 /* 2652 * If we get an error, we need to 2653 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 2654 * We then get retied later 2655 */ 2656 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2657 if (i < 0) { 2658 s->internal->rwstate = SSL_X509_LOOKUP; 2659 return (-1); 2660 } 2661 s->internal->rwstate = SSL_NOTHING; 2662 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2663 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2664 if (!SSL_use_certificate(s, x509) || 2665 !SSL_use_PrivateKey(s, pkey)) 2666 i = 0; 2667 } else if (i == 1) { 2668 i = 0; 2669 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2670 } 2671 2672 X509_free(x509); 2673 EVP_PKEY_free(pkey); 2674 if (i == 0) { 2675 S3I(s)->tmp.cert_req = 2; 2676 2677 /* There is no client certificate to verify. */ 2678 tls1_transcript_free(s); 2679 } 2680 2681 /* Ok, we have a cert */ 2682 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2683 } 2684 2685 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2686 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2687 SSL3_MT_CERTIFICATE)) 2688 goto err; 2689 if (!ssl3_output_cert_chain(s, &client_cert, 2690 (S3I(s)->tmp.cert_req == 2) ? NULL : s->cert->key)) 2691 goto err; 2692 if (!ssl3_handshake_msg_finish(s, &cbb)) 2693 goto err; 2694 2695 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2696 } 2697 2698 /* SSL3_ST_CW_CERT_D */ 2699 return (ssl3_handshake_write(s)); 2700 2701 err: 2702 CBB_cleanup(&cbb); 2703 2704 return (0); 2705 } 2706 2707 #define has_bits(i,m) (((i)&(m)) == (m)) 2708 2709 int 2710 ssl3_check_cert_and_algorithm(SSL *s) 2711 { 2712 int i, idx; 2713 long alg_k, alg_a; 2714 EVP_PKEY *pkey = NULL; 2715 SESS_CERT *sc; 2716 DH *dh; 2717 2718 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2719 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 2720 2721 /* We don't have a certificate. */ 2722 if (alg_a & SSL_aNULL) 2723 return (1); 2724 2725 sc = SSI(s)->sess_cert; 2726 if (sc == NULL) { 2727 SSLerror(s, ERR_R_INTERNAL_ERROR); 2728 goto err; 2729 } 2730 dh = SSI(s)->sess_cert->peer_dh_tmp; 2731 2732 /* This is the passed certificate. */ 2733 2734 idx = sc->peer_cert_type; 2735 if (idx == SSL_PKEY_ECC) { 2736 if (ssl_check_srvr_ecc_cert_and_alg( 2737 sc->peer_pkeys[idx].x509, s) == 0) { 2738 /* check failed */ 2739 SSLerror(s, SSL_R_BAD_ECC_CERT); 2740 goto fatal_err; 2741 } else { 2742 return (1); 2743 } 2744 } 2745 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2746 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2747 EVP_PKEY_free(pkey); 2748 2749 /* Check that we have a certificate if we require one. */ 2750 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2751 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2752 goto fatal_err; 2753 } 2754 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2755 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2756 goto fatal_err; 2757 } 2758 if ((alg_k & SSL_kDHE) && 2759 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2760 SSLerror(s, SSL_R_MISSING_DH_KEY); 2761 goto fatal_err; 2762 } 2763 2764 return (1); 2765 fatal_err: 2766 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2767 err: 2768 return (0); 2769 } 2770 2771 /* 2772 * Check to see if handshake is full or resumed. Usually this is just a 2773 * case of checking to see if a cache hit has occurred. In the case of 2774 * session tickets we have to check the next message to be sure. 2775 */ 2776 2777 int 2778 ssl3_check_finished(SSL *s) 2779 { 2780 int ok; 2781 long n; 2782 2783 /* If we have no ticket it cannot be a resumed session. */ 2784 if (!s->session->tlsext_tick) 2785 return (1); 2786 /* this function is called when we really expect a Certificate 2787 * message, so permit appropriate message length */ 2788 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2789 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2790 if (!ok) 2791 return ((int)n); 2792 2793 S3I(s)->tmp.reuse_message = 1; 2794 if ((S3I(s)->tmp.message_type == SSL3_MT_FINISHED) || 2795 (S3I(s)->tmp.message_type == SSL3_MT_NEWSESSION_TICKET)) 2796 return (2); 2797 2798 return (1); 2799 } 2800 2801 int 2802 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2803 { 2804 int i = 0; 2805 2806 #ifndef OPENSSL_NO_ENGINE 2807 if (s->ctx->internal->client_cert_engine) { 2808 i = ENGINE_load_ssl_client_cert( 2809 s->ctx->internal->client_cert_engine, s, 2810 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2811 if (i != 0) 2812 return (i); 2813 } 2814 #endif 2815 if (s->ctx->internal->client_cert_cb) 2816 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2817 return (i); 2818 } 2819