1 /* $OpenBSD: ssl_clnt.c,v 1.113 2021/10/23 08:34:36 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 <openssl/bn.h> 156 #include <openssl/buffer.h> 157 #include <openssl/curve25519.h> 158 #include <openssl/dh.h> 159 #include <openssl/evp.h> 160 #include <openssl/md5.h> 161 #include <openssl/objects.h> 162 #include <openssl/opensslconf.h> 163 164 #ifndef OPENSSL_NO_ENGINE 165 #include <openssl/engine.h> 166 #endif 167 #ifndef OPENSSL_NO_GOST 168 #include <openssl/gost.h> 169 #endif 170 171 #include "bytestring.h" 172 #include "dtls_locl.h" 173 #include "ssl_locl.h" 174 #include "ssl_sigalgs.h" 175 #include "ssl_tlsext.h" 176 177 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b); 178 179 int 180 ssl3_connect(SSL *s) 181 { 182 int new_state, state, skip = 0; 183 int ret = -1; 184 185 ERR_clear_error(); 186 errno = 0; 187 188 s->internal->in_handshake++; 189 if (!SSL_in_init(s) || SSL_in_before(s)) 190 SSL_clear(s); 191 192 for (;;) { 193 state = S3I(s)->hs.state; 194 195 switch (S3I(s)->hs.state) { 196 case SSL_ST_RENEGOTIATE: 197 s->internal->renegotiate = 1; 198 S3I(s)->hs.state = SSL_ST_CONNECT; 199 s->ctx->internal->stats.sess_connect_renegotiate++; 200 /* break */ 201 case SSL_ST_BEFORE: 202 case SSL_ST_CONNECT: 203 case SSL_ST_BEFORE|SSL_ST_CONNECT: 204 case SSL_ST_OK|SSL_ST_CONNECT: 205 206 s->server = 0; 207 208 ssl_info_callback(s, SSL_CB_HANDSHAKE_START, 1); 209 210 if (!ssl_legacy_stack_version(s, s->version)) { 211 SSLerror(s, ERR_R_INTERNAL_ERROR); 212 ret = -1; 213 goto end; 214 } 215 216 if (!ssl_supported_tls_version_range(s, 217 &S3I(s)->hs.our_min_tls_version, 218 &S3I(s)->hs.our_max_tls_version)) { 219 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 220 ret = -1; 221 goto end; 222 } 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.tls12.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.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)->hs.tls12.cert_request) 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)->hs.tls12.cert_request == 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 s->session->cipher = S3I(s)->hs.cipher; 473 474 if (!tls1_setup_key_block(s)) { 475 ret = -1; 476 goto end; 477 } 478 if (!tls1_change_write_cipher_state(s)) { 479 ret = -1; 480 goto end; 481 } 482 break; 483 484 case SSL3_ST_CW_FINISHED_A: 485 case SSL3_ST_CW_FINISHED_B: 486 if (SSL_is_dtls(s) && !s->internal->hit) 487 dtls1_start_timer(s); 488 ret = ssl3_send_finished(s, SSL3_ST_CW_FINISHED_A, 489 SSL3_ST_CW_FINISHED_B); 490 if (ret <= 0) 491 goto end; 492 if (!SSL_is_dtls(s)) 493 s->s3->flags |= SSL3_FLAGS_CCS_OK; 494 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 495 496 /* clear flags */ 497 if (s->internal->hit) { 498 S3I(s)->hs.tls12.next_state = SSL_ST_OK; 499 } else { 500 /* Allow NewSessionTicket if ticket expected */ 501 if (s->internal->tlsext_ticket_expected) 502 S3I(s)->hs.tls12.next_state = 503 SSL3_ST_CR_SESSION_TICKET_A; 504 else 505 S3I(s)->hs.tls12.next_state = 506 SSL3_ST_CR_FINISHED_A; 507 } 508 s->internal->init_num = 0; 509 break; 510 511 case SSL3_ST_CR_SESSION_TICKET_A: 512 case SSL3_ST_CR_SESSION_TICKET_B: 513 ret = ssl3_get_new_session_ticket(s); 514 if (ret <= 0) 515 goto end; 516 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 517 s->internal->init_num = 0; 518 break; 519 520 case SSL3_ST_CR_CERT_STATUS_A: 521 case SSL3_ST_CR_CERT_STATUS_B: 522 ret = ssl3_get_cert_status(s); 523 if (ret <= 0) 524 goto end; 525 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 526 s->internal->init_num = 0; 527 break; 528 529 case SSL3_ST_CR_FINISHED_A: 530 case SSL3_ST_CR_FINISHED_B: 531 if (SSL_is_dtls(s)) 532 D1I(s)->change_cipher_spec_ok = 1; 533 else 534 s->s3->flags |= SSL3_FLAGS_CCS_OK; 535 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 536 SSL3_ST_CR_FINISHED_B); 537 if (ret <= 0) 538 goto end; 539 if (SSL_is_dtls(s)) 540 dtls1_stop_timer(s); 541 542 if (s->internal->hit) 543 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 544 else 545 S3I(s)->hs.state = SSL_ST_OK; 546 s->internal->init_num = 0; 547 break; 548 549 case SSL3_ST_CW_FLUSH: 550 s->internal->rwstate = SSL_WRITING; 551 if (BIO_flush(s->wbio) <= 0) { 552 if (SSL_is_dtls(s)) { 553 /* If the write error was fatal, stop trying */ 554 if (!BIO_should_retry(s->wbio)) { 555 s->internal->rwstate = SSL_NOTHING; 556 S3I(s)->hs.state = S3I(s)->hs.tls12.next_state; 557 } 558 } 559 ret = -1; 560 goto end; 561 } 562 s->internal->rwstate = SSL_NOTHING; 563 S3I(s)->hs.state = S3I(s)->hs.tls12.next_state; 564 break; 565 566 case SSL_ST_OK: 567 /* clean a few things up */ 568 tls1_cleanup_key_block(s); 569 570 if (S3I(s)->handshake_transcript != NULL) { 571 SSLerror(s, ERR_R_INTERNAL_ERROR); 572 ret = -1; 573 goto end; 574 } 575 576 if (!SSL_is_dtls(s)) 577 ssl3_release_init_buffer(s); 578 579 ssl_free_wbio_buffer(s); 580 581 s->internal->init_num = 0; 582 s->internal->renegotiate = 0; 583 s->internal->new_session = 0; 584 585 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 586 if (s->internal->hit) 587 s->ctx->internal->stats.sess_hit++; 588 589 ret = 1; 590 /* s->server=0; */ 591 s->internal->handshake_func = ssl3_connect; 592 s->ctx->internal->stats.sess_connect_good++; 593 594 ssl_info_callback(s, SSL_CB_HANDSHAKE_DONE, 1); 595 596 if (SSL_is_dtls(s)) { 597 /* done with handshaking */ 598 D1I(s)->handshake_read_seq = 0; 599 D1I(s)->next_handshake_write_seq = 0; 600 } 601 602 goto end; 603 /* break; */ 604 605 default: 606 SSLerror(s, SSL_R_UNKNOWN_STATE); 607 ret = -1; 608 goto end; 609 /* break; */ 610 } 611 612 /* did we do anything */ 613 if (!S3I(s)->hs.tls12.reuse_message && !skip) { 614 if (s->internal->debug) { 615 if ((ret = BIO_flush(s->wbio)) <= 0) 616 goto end; 617 } 618 619 if (S3I(s)->hs.state != state) { 620 new_state = S3I(s)->hs.state; 621 S3I(s)->hs.state = state; 622 ssl_info_callback(s, SSL_CB_CONNECT_LOOP, 1); 623 S3I(s)->hs.state = new_state; 624 } 625 } 626 skip = 0; 627 } 628 629 end: 630 s->internal->in_handshake--; 631 ssl_info_callback(s, SSL_CB_CONNECT_EXIT, ret); 632 633 return (ret); 634 } 635 636 int 637 ssl3_send_client_hello(SSL *s) 638 { 639 CBB cbb, client_hello, session_id, cookie, cipher_suites; 640 CBB compression_methods; 641 uint16_t max_version; 642 size_t sl; 643 644 memset(&cbb, 0, sizeof(cbb)); 645 646 if (S3I(s)->hs.state == SSL3_ST_CW_CLNT_HELLO_A) { 647 SSL_SESSION *sess = s->session; 648 649 if (!ssl_max_supported_version(s, &max_version)) { 650 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 651 return (-1); 652 } 653 s->client_version = s->version = max_version; 654 655 if (sess == NULL || 656 sess->ssl_version != s->version || 657 (!sess->session_id_length && !sess->tlsext_tick) || 658 sess->internal->not_resumable) { 659 if (!ssl_get_new_session(s, 0)) 660 goto err; 661 } 662 /* else use the pre-loaded session */ 663 664 /* 665 * If a DTLS ClientHello message is being resent after a 666 * HelloVerifyRequest, we must retain the original client 667 * random value. 668 */ 669 if (!SSL_is_dtls(s) || D1I(s)->send_cookie == 0) 670 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE); 671 672 if (!ssl3_handshake_msg_start(s, &cbb, &client_hello, 673 SSL3_MT_CLIENT_HELLO)) 674 goto err; 675 676 /* 677 * Version indicates the negotiated version: for example from 678 * an SSLv2/v3 compatible client hello). The client_version 679 * field is the maximum version we permit and it is also 680 * used in RSA encrypted premaster secrets. Some servers can 681 * choke if we initially report a higher version then 682 * renegotiate to a lower one in the premaster secret. This 683 * didn't happen with TLS 1.0 as most servers supported it 684 * but it can with TLS 1.1 or later if the server only supports 685 * 1.0. 686 * 687 * Possible scenario with previous logic: 688 * 1. Client hello indicates TLS 1.2 689 * 2. Server hello says TLS 1.0 690 * 3. RSA encrypted premaster secret uses 1.2. 691 * 4. Handhaked proceeds using TLS 1.0. 692 * 5. Server sends hello request to renegotiate. 693 * 6. Client hello indicates TLS v1.0 as we now 694 * know that is maximum server supports. 695 * 7. Server chokes on RSA encrypted premaster secret 696 * containing version 1.0. 697 * 698 * For interoperability it should be OK to always use the 699 * maximum version we support in client hello and then rely 700 * on the checking of version to ensure the servers isn't 701 * being inconsistent: for example initially negotiating with 702 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using 703 * client_version in client hello and not resetting it to 704 * the negotiated version. 705 */ 706 if (!CBB_add_u16(&client_hello, s->client_version)) 707 goto err; 708 709 /* Random stuff */ 710 if (!CBB_add_bytes(&client_hello, s->s3->client_random, 711 sizeof(s->s3->client_random))) 712 goto err; 713 714 /* Session ID */ 715 if (!CBB_add_u8_length_prefixed(&client_hello, &session_id)) 716 goto err; 717 if (!s->internal->new_session && 718 s->session->session_id_length > 0) { 719 sl = s->session->session_id_length; 720 if (sl > sizeof(s->session->session_id)) { 721 SSLerror(s, ERR_R_INTERNAL_ERROR); 722 goto err; 723 } 724 if (!CBB_add_bytes(&session_id, 725 s->session->session_id, sl)) 726 goto err; 727 } 728 729 /* DTLS Cookie. */ 730 if (SSL_is_dtls(s)) { 731 if (D1I(s)->cookie_len > sizeof(D1I(s)->cookie)) { 732 SSLerror(s, ERR_R_INTERNAL_ERROR); 733 goto err; 734 } 735 if (!CBB_add_u8_length_prefixed(&client_hello, &cookie)) 736 goto err; 737 if (!CBB_add_bytes(&cookie, D1I(s)->cookie, 738 D1I(s)->cookie_len)) 739 goto err; 740 } 741 742 /* Ciphers supported */ 743 if (!CBB_add_u16_length_prefixed(&client_hello, &cipher_suites)) 744 return 0; 745 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), 746 &cipher_suites)) { 747 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE); 748 goto err; 749 } 750 751 /* Add in compression methods (null) */ 752 if (!CBB_add_u8_length_prefixed(&client_hello, 753 &compression_methods)) 754 goto err; 755 if (!CBB_add_u8(&compression_methods, 0)) 756 goto err; 757 758 /* TLS extensions */ 759 if (!tlsext_client_build(s, SSL_TLSEXT_MSG_CH, &client_hello)) { 760 SSLerror(s, ERR_R_INTERNAL_ERROR); 761 goto err; 762 } 763 764 if (!ssl3_handshake_msg_finish(s, &cbb)) 765 goto err; 766 767 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_B; 768 } 769 770 /* SSL3_ST_CW_CLNT_HELLO_B */ 771 return (ssl3_handshake_write(s)); 772 773 err: 774 CBB_cleanup(&cbb); 775 776 return (-1); 777 } 778 779 int 780 ssl3_get_dtls_hello_verify(SSL *s) 781 { 782 CBS hello_verify_request, cookie; 783 size_t cookie_len; 784 uint16_t ssl_version; 785 int al, ret; 786 787 if ((ret = ssl3_get_message(s, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 788 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, s->internal->max_cert_list)) <= 0) 789 return ret; 790 791 if (S3I(s)->hs.tls12.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 792 D1I(s)->send_cookie = 0; 793 S3I(s)->hs.tls12.reuse_message = 1; 794 return (1); 795 } 796 797 if (s->internal->init_num < 0) 798 goto decode_err; 799 800 CBS_init(&hello_verify_request, s->internal->init_msg, 801 s->internal->init_num); 802 803 if (!CBS_get_u16(&hello_verify_request, &ssl_version)) 804 goto decode_err; 805 if (!CBS_get_u8_length_prefixed(&hello_verify_request, &cookie)) 806 goto decode_err; 807 if (CBS_len(&hello_verify_request) != 0) 808 goto decode_err; 809 810 /* 811 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should always 812 * contain DTLSv1.0 the version that is going to be negotiated. 813 * Tolerate DTLSv1.2 just in case. 814 */ 815 if (ssl_version != DTLS1_VERSION && ssl_version != DTLS1_2_VERSION) { 816 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 817 s->version = (s->version & 0xff00) | (ssl_version & 0xff); 818 al = SSL_AD_PROTOCOL_VERSION; 819 goto fatal_err; 820 } 821 822 if (!CBS_write_bytes(&cookie, D1I(s)->cookie, 823 sizeof(D1I(s)->cookie), &cookie_len)) { 824 D1I(s)->cookie_len = 0; 825 al = SSL_AD_ILLEGAL_PARAMETER; 826 goto fatal_err; 827 } 828 D1I(s)->cookie_len = cookie_len; 829 D1I(s)->send_cookie = 1; 830 831 return 1; 832 833 decode_err: 834 al = SSL_AD_DECODE_ERROR; 835 fatal_err: 836 ssl3_send_alert(s, SSL3_AL_FATAL, al); 837 return -1; 838 } 839 840 int 841 ssl3_get_server_hello(SSL *s) 842 { 843 CBS cbs, server_random, session_id; 844 uint16_t server_version, cipher_suite; 845 uint8_t compression_method; 846 const SSL_CIPHER *cipher; 847 const SSL_METHOD *method; 848 unsigned long alg_k; 849 size_t outlen; 850 int al, ret; 851 852 s->internal->first_packet = 1; 853 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 854 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000 /* ?? */)) <= 0) 855 return ret; 856 s->internal->first_packet = 0; 857 858 if (s->internal->init_num < 0) 859 goto decode_err; 860 861 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 862 863 if (SSL_is_dtls(s)) { 864 if (S3I(s)->hs.tls12.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 865 if (D1I(s)->send_cookie == 0) { 866 S3I(s)->hs.tls12.reuse_message = 1; 867 return (1); 868 } else { 869 /* Already sent a cookie. */ 870 al = SSL_AD_UNEXPECTED_MESSAGE; 871 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 872 goto fatal_err; 873 } 874 } 875 } 876 877 if (S3I(s)->hs.tls12.message_type != SSL3_MT_SERVER_HELLO) { 878 al = SSL_AD_UNEXPECTED_MESSAGE; 879 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 880 goto fatal_err; 881 } 882 883 if (!CBS_get_u16(&cbs, &server_version)) 884 goto decode_err; 885 886 if (!ssl_check_version_from_server(s, server_version)) { 887 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 888 s->version = (s->version & 0xff00) | (server_version & 0xff); 889 al = SSL_AD_PROTOCOL_VERSION; 890 goto fatal_err; 891 } 892 s->version = server_version; 893 894 S3I(s)->hs.negotiated_tls_version = ssl_tls_version(server_version); 895 if (S3I(s)->hs.negotiated_tls_version == 0) { 896 SSLerror(s, ERR_R_INTERNAL_ERROR); 897 goto err; 898 } 899 900 if ((method = ssl_get_method(server_version)) == NULL) { 901 SSLerror(s, ERR_R_INTERNAL_ERROR); 902 goto err; 903 } 904 s->method = method; 905 906 /* Server random. */ 907 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 908 goto decode_err; 909 if (!CBS_write_bytes(&server_random, s->s3->server_random, 910 sizeof(s->s3->server_random), NULL)) 911 goto err; 912 913 if (S3I(s)->hs.our_max_tls_version >= TLS1_2_VERSION && 914 S3I(s)->hs.negotiated_tls_version < S3I(s)->hs.our_max_tls_version) { 915 /* 916 * RFC 8446 section 4.1.3. We must not downgrade if the server 917 * random value contains the TLS 1.2 or TLS 1.1 magical value. 918 */ 919 if (!CBS_skip(&server_random, 920 CBS_len(&server_random) - sizeof(tls13_downgrade_12))) 921 goto err; 922 if (S3I(s)->hs.negotiated_tls_version == TLS1_2_VERSION && 923 CBS_mem_equal(&server_random, tls13_downgrade_12, 924 sizeof(tls13_downgrade_12))) { 925 al = SSL_AD_ILLEGAL_PARAMETER; 926 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 927 goto fatal_err; 928 } 929 if (CBS_mem_equal(&server_random, tls13_downgrade_11, 930 sizeof(tls13_downgrade_11))) { 931 al = SSL_AD_ILLEGAL_PARAMETER; 932 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 933 goto fatal_err; 934 } 935 } 936 937 /* Session ID. */ 938 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 939 goto decode_err; 940 941 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 942 al = SSL_AD_ILLEGAL_PARAMETER; 943 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 944 goto fatal_err; 945 } 946 947 /* Cipher suite. */ 948 if (!CBS_get_u16(&cbs, &cipher_suite)) 949 goto decode_err; 950 951 /* 952 * Check if we want to resume the session based on external 953 * pre-shared secret. 954 */ 955 if (s->internal->tls_session_secret_cb) { 956 SSL_CIPHER *pref_cipher = NULL; 957 s->session->master_key_length = sizeof(s->session->master_key); 958 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 959 &s->session->master_key_length, NULL, &pref_cipher, 960 s->internal->tls_session_secret_cb_arg)) { 961 s->session->cipher = pref_cipher ? pref_cipher : 962 ssl3_get_cipher_by_value(cipher_suite); 963 s->s3->flags |= SSL3_FLAGS_CCS_OK; 964 } 965 } 966 967 if (s->session->session_id_length != 0 && 968 CBS_mem_equal(&session_id, s->session->session_id, 969 s->session->session_id_length)) { 970 if (s->sid_ctx_length != s->session->sid_ctx_length || 971 timingsafe_memcmp(s->session->sid_ctx, 972 s->sid_ctx, s->sid_ctx_length) != 0) { 973 /* actually a client application bug */ 974 al = SSL_AD_ILLEGAL_PARAMETER; 975 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 976 goto fatal_err; 977 } 978 s->s3->flags |= SSL3_FLAGS_CCS_OK; 979 s->internal->hit = 1; 980 } else { 981 /* a miss or crap from the other end */ 982 983 /* If we were trying for session-id reuse, make a new 984 * SSL_SESSION so we don't stuff up other people */ 985 s->internal->hit = 0; 986 if (s->session->session_id_length > 0) { 987 if (!ssl_get_new_session(s, 0)) { 988 al = SSL_AD_INTERNAL_ERROR; 989 goto fatal_err; 990 } 991 } 992 993 /* 994 * XXX - improve the handling for the case where there is a 995 * zero length session identifier. 996 */ 997 if (!CBS_write_bytes(&session_id, s->session->session_id, 998 sizeof(s->session->session_id), &outlen)) 999 goto err; 1000 s->session->session_id_length = outlen; 1001 1002 s->session->ssl_version = s->version; 1003 } 1004 1005 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 1006 al = SSL_AD_ILLEGAL_PARAMETER; 1007 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 1008 goto fatal_err; 1009 } 1010 1011 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 1012 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 1013 S3I(s)->hs.negotiated_tls_version < TLS1_2_VERSION) { 1014 al = SSL_AD_ILLEGAL_PARAMETER; 1015 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1016 goto fatal_err; 1017 } 1018 1019 if (!ssl_cipher_in_list(SSL_get_ciphers(s), cipher)) { 1020 /* we did not say we would use this cipher */ 1021 al = SSL_AD_ILLEGAL_PARAMETER; 1022 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1023 goto fatal_err; 1024 } 1025 1026 /* 1027 * Depending on the session caching (internal/external), the cipher 1028 * and/or cipher_id values may not be set. Make sure that 1029 * cipher_id is set and use it for comparison. 1030 */ 1031 if (s->session->cipher) 1032 s->session->cipher_id = s->session->cipher->id; 1033 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 1034 al = SSL_AD_ILLEGAL_PARAMETER; 1035 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1036 goto fatal_err; 1037 } 1038 S3I(s)->hs.cipher = cipher; 1039 1040 if (!tls1_transcript_hash_init(s)) 1041 goto err; 1042 1043 /* 1044 * Don't digest cached records if no sigalgs: we may need them for 1045 * client authentication. 1046 */ 1047 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 1048 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST))) 1049 tls1_transcript_free(s); 1050 1051 if (!CBS_get_u8(&cbs, &compression_method)) 1052 goto decode_err; 1053 1054 if (compression_method != 0) { 1055 al = SSL_AD_ILLEGAL_PARAMETER; 1056 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1057 goto fatal_err; 1058 } 1059 1060 if (!tlsext_client_parse(s, SSL_TLSEXT_MSG_SH, &cbs, &al)) { 1061 SSLerror(s, SSL_R_PARSE_TLSEXT); 1062 goto fatal_err; 1063 } 1064 1065 if (CBS_len(&cbs) != 0) 1066 goto decode_err; 1067 1068 /* 1069 * Determine if we need to see RI. Strictly speaking if we want to 1070 * avoid an attack we should *always* see RI even on initial server 1071 * hello because the client doesn't see any renegotiation during an 1072 * attack. However this would mean we could not connect to any server 1073 * which doesn't support RI so for the immediate future tolerate RI 1074 * absence on initial connect only. 1075 */ 1076 if (!S3I(s)->renegotiate_seen && 1077 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1078 al = SSL_AD_HANDSHAKE_FAILURE; 1079 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1080 goto fatal_err; 1081 } 1082 1083 if (ssl_check_serverhello_tlsext(s) <= 0) { 1084 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1085 goto err; 1086 } 1087 1088 return (1); 1089 1090 decode_err: 1091 /* wrong packet length */ 1092 al = SSL_AD_DECODE_ERROR; 1093 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1094 fatal_err: 1095 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1096 err: 1097 return (-1); 1098 } 1099 1100 int 1101 ssl3_get_server_certificate(SSL *s) 1102 { 1103 int al, i, ret; 1104 CBS cbs, cert_list; 1105 X509 *x = NULL; 1106 const unsigned char *q; 1107 STACK_OF(X509) *sk = NULL; 1108 SESS_CERT *sc; 1109 EVP_PKEY *pkey = NULL; 1110 1111 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1112 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list)) <= 0) 1113 return ret; 1114 1115 ret = -1; 1116 1117 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1118 S3I(s)->hs.tls12.reuse_message = 1; 1119 return (1); 1120 } 1121 1122 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE) { 1123 al = SSL_AD_UNEXPECTED_MESSAGE; 1124 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1125 goto fatal_err; 1126 } 1127 1128 if ((sk = sk_X509_new_null()) == NULL) { 1129 SSLerror(s, ERR_R_MALLOC_FAILURE); 1130 goto err; 1131 } 1132 1133 if (s->internal->init_num < 0) 1134 goto decode_err; 1135 1136 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 1137 if (CBS_len(&cbs) < 3) 1138 goto decode_err; 1139 1140 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1141 CBS_len(&cbs) != 0) { 1142 al = SSL_AD_DECODE_ERROR; 1143 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1144 goto fatal_err; 1145 } 1146 1147 while (CBS_len(&cert_list) > 0) { 1148 CBS cert; 1149 1150 if (CBS_len(&cert_list) < 3) 1151 goto decode_err; 1152 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1153 al = SSL_AD_DECODE_ERROR; 1154 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1155 goto fatal_err; 1156 } 1157 1158 q = CBS_data(&cert); 1159 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1160 if (x == NULL) { 1161 al = SSL_AD_BAD_CERTIFICATE; 1162 SSLerror(s, ERR_R_ASN1_LIB); 1163 goto fatal_err; 1164 } 1165 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1166 al = SSL_AD_DECODE_ERROR; 1167 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1168 goto fatal_err; 1169 } 1170 if (!sk_X509_push(sk, x)) { 1171 SSLerror(s, ERR_R_MALLOC_FAILURE); 1172 goto err; 1173 } 1174 x = NULL; 1175 } 1176 1177 i = ssl_verify_cert_chain(s, sk); 1178 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1179 al = ssl_verify_alarm_type(s->verify_result); 1180 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1181 goto fatal_err; 1182 1183 } 1184 ERR_clear_error(); /* but we keep s->verify_result */ 1185 1186 sc = ssl_sess_cert_new(); 1187 if (sc == NULL) 1188 goto err; 1189 ssl_sess_cert_free(SSI(s)->sess_cert); 1190 SSI(s)->sess_cert = sc; 1191 1192 sc->cert_chain = sk; 1193 /* 1194 * Inconsistency alert: cert_chain does include the peer's 1195 * certificate, which we don't include in s3_srvr.c 1196 */ 1197 x = sk_X509_value(sk, 0); 1198 sk = NULL; 1199 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1200 1201 pkey = X509_get_pubkey(x); 1202 1203 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1204 x = NULL; 1205 al = SSL3_AL_FATAL; 1206 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1207 goto fatal_err; 1208 } 1209 1210 i = ssl_cert_type(x, pkey); 1211 if (i < 0) { 1212 x = NULL; 1213 al = SSL3_AL_FATAL; 1214 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1215 goto fatal_err; 1216 } 1217 1218 sc->peer_cert_type = i; 1219 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1220 /* 1221 * Why would the following ever happen? 1222 * We just created sc a couple of lines ago. 1223 */ 1224 X509_free(sc->peer_pkeys[i].x509); 1225 sc->peer_pkeys[i].x509 = x; 1226 sc->peer_key = &(sc->peer_pkeys[i]); 1227 1228 X509_free(s->session->peer); 1229 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1230 s->session->peer = x; 1231 s->session->verify_result = s->verify_result; 1232 1233 x = NULL; 1234 ret = 1; 1235 1236 if (0) { 1237 decode_err: 1238 /* wrong packet length */ 1239 al = SSL_AD_DECODE_ERROR; 1240 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1241 fatal_err: 1242 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1243 } 1244 err: 1245 EVP_PKEY_free(pkey); 1246 X509_free(x); 1247 sk_X509_pop_free(sk, X509_free); 1248 1249 return (ret); 1250 } 1251 1252 static int 1253 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1254 { 1255 CBS dhp, dhg, dhpk; 1256 BN_CTX *bn_ctx = NULL; 1257 SESS_CERT *sc = NULL; 1258 DH *dh = NULL; 1259 long alg_a; 1260 int al; 1261 1262 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1263 sc = SSI(s)->sess_cert; 1264 1265 if ((dh = DH_new()) == NULL) { 1266 SSLerror(s, ERR_R_DH_LIB); 1267 goto err; 1268 } 1269 1270 if (!CBS_get_u16_length_prefixed(cbs, &dhp)) 1271 goto decode_err; 1272 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1273 SSLerror(s, ERR_R_BN_LIB); 1274 goto err; 1275 } 1276 1277 if (!CBS_get_u16_length_prefixed(cbs, &dhg)) 1278 goto decode_err; 1279 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1280 SSLerror(s, ERR_R_BN_LIB); 1281 goto err; 1282 } 1283 1284 if (!CBS_get_u16_length_prefixed(cbs, &dhpk)) 1285 goto decode_err; 1286 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1287 NULL)) == NULL) { 1288 SSLerror(s, ERR_R_BN_LIB); 1289 goto err; 1290 } 1291 1292 /* 1293 * Check the strength of the DH key just constructed. 1294 * Discard keys weaker than 1024 bits. 1295 */ 1296 if (DH_size(dh) < 1024 / 8) { 1297 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1298 goto err; 1299 } 1300 1301 if (alg_a & SSL_aRSA) 1302 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1303 else 1304 /* XXX - Anonymous DH, so no certificate or pkey. */ 1305 *pkey = NULL; 1306 1307 sc->peer_dh_tmp = dh; 1308 1309 return (1); 1310 1311 decode_err: 1312 al = SSL_AD_DECODE_ERROR; 1313 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1314 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1315 1316 err: 1317 DH_free(dh); 1318 BN_CTX_free(bn_ctx); 1319 1320 return (-1); 1321 } 1322 1323 static int 1324 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1325 { 1326 EC_KEY *ecdh = NULL; 1327 int ret = -1; 1328 1329 /* Extract the server's ephemeral ECDH public key. */ 1330 if ((ecdh = EC_KEY_new()) == NULL) { 1331 SSLerror(s, ERR_R_MALLOC_FAILURE); 1332 goto err; 1333 } 1334 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh, nid, public)) { 1335 SSLerror(s, SSL_R_BAD_ECPOINT); 1336 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1337 goto err; 1338 } 1339 1340 sc->peer_nid = nid; 1341 sc->peer_ecdh_tmp = ecdh; 1342 ecdh = NULL; 1343 1344 ret = 1; 1345 1346 err: 1347 EC_KEY_free(ecdh); 1348 1349 return (ret); 1350 } 1351 1352 static int 1353 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1354 { 1355 size_t outlen; 1356 1357 if (nid != NID_X25519) { 1358 SSLerror(s, ERR_R_INTERNAL_ERROR); 1359 goto err; 1360 } 1361 1362 if (CBS_len(public) != X25519_KEY_LENGTH) { 1363 SSLerror(s, SSL_R_BAD_ECPOINT); 1364 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1365 goto err; 1366 } 1367 1368 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1369 SSLerror(s, ERR_R_MALLOC_FAILURE); 1370 goto err; 1371 } 1372 1373 return (1); 1374 1375 err: 1376 return (-1); 1377 } 1378 1379 static int 1380 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1381 { 1382 CBS public; 1383 uint8_t curve_type; 1384 uint16_t curve_id; 1385 SESS_CERT *sc; 1386 long alg_a; 1387 int nid; 1388 int al; 1389 1390 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1391 sc = SSI(s)->sess_cert; 1392 1393 /* Only named curves are supported. */ 1394 if (!CBS_get_u8(cbs, &curve_type) || 1395 curve_type != NAMED_CURVE_TYPE || 1396 !CBS_get_u16(cbs, &curve_id)) { 1397 al = SSL_AD_DECODE_ERROR; 1398 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1399 goto fatal_err; 1400 } 1401 1402 /* 1403 * Check that the curve is one of our preferences - if it is not, 1404 * the server has sent us an invalid curve. 1405 */ 1406 if (tls1_check_curve(s, curve_id) != 1) { 1407 al = SSL_AD_DECODE_ERROR; 1408 SSLerror(s, SSL_R_WRONG_CURVE); 1409 goto fatal_err; 1410 } 1411 1412 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1413 al = SSL_AD_INTERNAL_ERROR; 1414 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1415 goto fatal_err; 1416 } 1417 1418 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1419 goto decode_err; 1420 1421 if (nid == NID_X25519) { 1422 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1423 goto err; 1424 } else { 1425 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1426 goto err; 1427 } 1428 1429 /* 1430 * The ECC/TLS specification does not mention the use of DSA to sign 1431 * ECParameters in the server key exchange message. We do support RSA 1432 * and ECDSA. 1433 */ 1434 if (alg_a & SSL_aRSA) 1435 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1436 else if (alg_a & SSL_aECDSA) 1437 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1438 else 1439 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1440 *pkey = NULL; 1441 1442 return (1); 1443 1444 decode_err: 1445 al = SSL_AD_DECODE_ERROR; 1446 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1447 1448 fatal_err: 1449 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1450 1451 err: 1452 return (-1); 1453 } 1454 1455 int 1456 ssl3_get_server_key_exchange(SSL *s) 1457 { 1458 CBS cbs, signature; 1459 EVP_PKEY *pkey = NULL; 1460 EVP_MD_CTX md_ctx; 1461 const unsigned char *param; 1462 size_t param_len; 1463 long alg_k, alg_a; 1464 int al, ret; 1465 1466 EVP_MD_CTX_init(&md_ctx); 1467 1468 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 1469 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1470 1471 /* 1472 * Use same message size as in ssl3_get_certificate_request() 1473 * as ServerKeyExchange message may be skipped. 1474 */ 1475 if ((ret = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1476 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list)) <= 0) 1477 return ret; 1478 1479 if (s->internal->init_num < 0) 1480 goto err; 1481 1482 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 1483 1484 if (S3I(s)->hs.tls12.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1485 /* 1486 * Do not skip server key exchange if this cipher suite uses 1487 * ephemeral keys. 1488 */ 1489 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1490 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1491 al = SSL_AD_UNEXPECTED_MESSAGE; 1492 goto fatal_err; 1493 } 1494 1495 S3I(s)->hs.tls12.reuse_message = 1; 1496 EVP_MD_CTX_cleanup(&md_ctx); 1497 return (1); 1498 } 1499 1500 if (SSI(s)->sess_cert != NULL) { 1501 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1502 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1503 1504 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1505 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1506 1507 free(SSI(s)->sess_cert->peer_x25519_tmp); 1508 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1509 } else { 1510 SSI(s)->sess_cert = ssl_sess_cert_new(); 1511 if (SSI(s)->sess_cert == NULL) 1512 goto err; 1513 } 1514 1515 param = CBS_data(&cbs); 1516 param_len = CBS_len(&cbs); 1517 1518 if (alg_k & SSL_kDHE) { 1519 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1) 1520 goto err; 1521 } else if (alg_k & SSL_kECDHE) { 1522 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1) 1523 goto err; 1524 } else if (alg_k != 0) { 1525 al = SSL_AD_UNEXPECTED_MESSAGE; 1526 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1527 goto fatal_err; 1528 } 1529 1530 param_len -= CBS_len(&cbs); 1531 1532 /* if it was signed, check the signature */ 1533 if (pkey != NULL) { 1534 uint16_t sigalg_value = SIGALG_NONE; 1535 const struct ssl_sigalg *sigalg; 1536 EVP_PKEY_CTX *pctx; 1537 1538 if (SSL_USE_SIGALGS(s)) { 1539 if (!CBS_get_u16(&cbs, &sigalg_value)) 1540 goto decode_err; 1541 } 1542 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1543 goto decode_err; 1544 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1545 al = SSL_AD_DECODE_ERROR; 1546 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1547 goto fatal_err; 1548 } 1549 1550 if ((sigalg = ssl_sigalg_for_peer(s, pkey, 1551 sigalg_value)) == NULL) { 1552 al = SSL_AD_DECODE_ERROR; 1553 goto fatal_err; 1554 } 1555 S3I(s)->hs.peer_sigalg = sigalg; 1556 1557 if (!EVP_DigestVerifyInit(&md_ctx, &pctx, sigalg->md(), 1558 NULL, pkey)) 1559 goto err; 1560 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->client_random, 1561 SSL3_RANDOM_SIZE)) 1562 goto err; 1563 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1564 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1565 RSA_PKCS1_PSS_PADDING) || 1566 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1567 goto err; 1568 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->server_random, 1569 SSL3_RANDOM_SIZE)) 1570 goto err; 1571 if (!EVP_DigestVerifyUpdate(&md_ctx, param, param_len)) 1572 goto err; 1573 if (EVP_DigestVerifyFinal(&md_ctx, CBS_data(&signature), 1574 CBS_len(&signature)) <= 0) { 1575 al = SSL_AD_DECRYPT_ERROR; 1576 SSLerror(s, SSL_R_BAD_SIGNATURE); 1577 goto fatal_err; 1578 } 1579 } else { 1580 /* aNULL does not need public keys. */ 1581 if (!(alg_a & SSL_aNULL)) { 1582 SSLerror(s, ERR_R_INTERNAL_ERROR); 1583 goto err; 1584 } 1585 } 1586 1587 if (CBS_len(&cbs) != 0) { 1588 al = SSL_AD_DECODE_ERROR; 1589 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1590 goto fatal_err; 1591 } 1592 1593 EVP_PKEY_free(pkey); 1594 EVP_MD_CTX_cleanup(&md_ctx); 1595 1596 return (1); 1597 1598 decode_err: 1599 al = SSL_AD_DECODE_ERROR; 1600 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1601 1602 fatal_err: 1603 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1604 1605 err: 1606 EVP_PKEY_free(pkey); 1607 EVP_MD_CTX_cleanup(&md_ctx); 1608 1609 return (-1); 1610 } 1611 1612 int 1613 ssl3_get_certificate_request(SSL *s) 1614 { 1615 CBS cert_request, cert_types, rdn_list; 1616 X509_NAME *xn = NULL; 1617 const unsigned char *q; 1618 STACK_OF(X509_NAME) *ca_sk = NULL; 1619 int ret; 1620 1621 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1622 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list)) <= 0) 1623 return ret; 1624 1625 ret = 0; 1626 1627 S3I(s)->hs.tls12.cert_request = 0; 1628 1629 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_DONE) { 1630 S3I(s)->hs.tls12.reuse_message = 1; 1631 /* 1632 * If we get here we don't need any cached handshake records 1633 * as we wont be doing client auth. 1634 */ 1635 tls1_transcript_free(s); 1636 return (1); 1637 } 1638 1639 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1640 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1641 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1642 goto err; 1643 } 1644 1645 /* TLS does not like anon-DH with client cert */ 1646 if (S3I(s)->hs.cipher->algorithm_auth & SSL_aNULL) { 1647 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1648 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1649 goto err; 1650 } 1651 1652 if (s->internal->init_num < 0) 1653 goto decode_err; 1654 CBS_init(&cert_request, s->internal->init_msg, s->internal->init_num); 1655 1656 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1657 SSLerror(s, ERR_R_MALLOC_FAILURE); 1658 goto err; 1659 } 1660 1661 if (!CBS_get_u8_length_prefixed(&cert_request, &cert_types)) 1662 goto decode_err; 1663 1664 if (SSL_USE_SIGALGS(s)) { 1665 CBS sigalgs; 1666 1667 if (CBS_len(&cert_request) < 2) { 1668 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1669 goto err; 1670 } 1671 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1672 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1673 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1674 goto err; 1675 } 1676 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1677 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1678 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1679 goto err; 1680 } 1681 if (!CBS_stow(&sigalgs, &S3I(s)->hs.sigalgs, 1682 &S3I(s)->hs.sigalgs_len)) 1683 goto err; 1684 } 1685 1686 /* get the CA RDNs */ 1687 if (CBS_len(&cert_request) < 2) { 1688 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1689 goto err; 1690 } 1691 1692 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1693 CBS_len(&cert_request) != 0) { 1694 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1695 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1696 goto err; 1697 } 1698 1699 while (CBS_len(&rdn_list) > 0) { 1700 CBS rdn; 1701 1702 if (CBS_len(&rdn_list) < 2) { 1703 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1704 goto err; 1705 } 1706 1707 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1708 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1709 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1710 goto err; 1711 } 1712 1713 q = CBS_data(&rdn); 1714 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1715 ssl3_send_alert(s, SSL3_AL_FATAL, 1716 SSL_AD_DECODE_ERROR); 1717 SSLerror(s, ERR_R_ASN1_LIB); 1718 goto err; 1719 } 1720 1721 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1722 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1723 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1724 goto err; 1725 } 1726 if (!sk_X509_NAME_push(ca_sk, xn)) { 1727 SSLerror(s, ERR_R_MALLOC_FAILURE); 1728 goto err; 1729 } 1730 xn = NULL; /* avoid free in err block */ 1731 } 1732 1733 /* we should setup a certificate to return.... */ 1734 S3I(s)->hs.tls12.cert_request = 1; 1735 sk_X509_NAME_pop_free(S3I(s)->hs.tls12.ca_names, X509_NAME_free); 1736 S3I(s)->hs.tls12.ca_names = ca_sk; 1737 ca_sk = NULL; 1738 1739 ret = 1; 1740 if (0) { 1741 decode_err: 1742 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1743 } 1744 err: 1745 X509_NAME_free(xn); 1746 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1747 return (ret); 1748 } 1749 1750 static int 1751 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1752 { 1753 return (X509_NAME_cmp(*a, *b)); 1754 } 1755 1756 int 1757 ssl3_get_new_session_ticket(SSL *s) 1758 { 1759 uint32_t lifetime_hint; 1760 CBS cbs, session_ticket; 1761 int al, ret; 1762 1763 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1764 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384)) <= 0) 1765 return ret; 1766 1767 ret = 0; 1768 1769 if (S3I(s)->hs.tls12.message_type == SSL3_MT_FINISHED) { 1770 S3I(s)->hs.tls12.reuse_message = 1; 1771 return (1); 1772 } 1773 if (S3I(s)->hs.tls12.message_type != SSL3_MT_NEWSESSION_TICKET) { 1774 al = SSL_AD_UNEXPECTED_MESSAGE; 1775 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1776 goto fatal_err; 1777 } 1778 1779 if (s->internal->init_num < 0) { 1780 al = SSL_AD_DECODE_ERROR; 1781 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1782 goto fatal_err; 1783 } 1784 1785 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 1786 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1787 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1788 CBS_len(&cbs) != 0) { 1789 al = SSL_AD_DECODE_ERROR; 1790 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1791 goto fatal_err; 1792 } 1793 s->session->tlsext_tick_lifetime_hint = lifetime_hint; 1794 1795 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1796 &s->session->tlsext_ticklen)) { 1797 SSLerror(s, ERR_R_MALLOC_FAILURE); 1798 goto err; 1799 } 1800 1801 /* 1802 * There are two ways to detect a resumed ticket sesion. 1803 * One is to set an appropriate session ID and then the server 1804 * must return a match in ServerHello. This allows the normal 1805 * client session ID matching to work and we know much 1806 * earlier that the ticket has been accepted. 1807 * 1808 * The other way is to set zero length session ID when the 1809 * ticket is presented and rely on the handshake to determine 1810 * session resumption. 1811 * 1812 * We choose the former approach because this fits in with 1813 * assumptions elsewhere in OpenSSL. The session ID is set 1814 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1815 * ticket. 1816 */ 1817 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1818 s->session->session_id, &s->session->session_id_length, 1819 EVP_sha256(), NULL); 1820 ret = 1; 1821 return (ret); 1822 fatal_err: 1823 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1824 err: 1825 return (-1); 1826 } 1827 1828 int 1829 ssl3_get_cert_status(SSL *s) 1830 { 1831 CBS cert_status, response; 1832 uint8_t status_type; 1833 int al, ret; 1834 1835 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1836 SSL3_ST_CR_CERT_STATUS_B, -1, 16384)) <= 0) 1837 return ret; 1838 1839 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1840 /* 1841 * Tell the callback the server did not send us an OSCP 1842 * response, and has decided to head directly to key exchange. 1843 */ 1844 if (s->ctx->internal->tlsext_status_cb) { 1845 free(s->internal->tlsext_ocsp_resp); 1846 s->internal->tlsext_ocsp_resp = NULL; 1847 s->internal->tlsext_ocsp_resp_len = 0; 1848 1849 ret = s->ctx->internal->tlsext_status_cb(s, 1850 s->ctx->internal->tlsext_status_arg); 1851 if (ret == 0) { 1852 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1853 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1854 goto fatal_err; 1855 } 1856 if (ret < 0) { 1857 al = SSL_AD_INTERNAL_ERROR; 1858 SSLerror(s, ERR_R_MALLOC_FAILURE); 1859 goto fatal_err; 1860 } 1861 } 1862 S3I(s)->hs.tls12.reuse_message = 1; 1863 return (1); 1864 } 1865 1866 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE && 1867 S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE_STATUS) { 1868 al = SSL_AD_UNEXPECTED_MESSAGE; 1869 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1870 goto fatal_err; 1871 } 1872 1873 if (s->internal->init_num < 0) { 1874 /* need at least status type + length */ 1875 al = SSL_AD_DECODE_ERROR; 1876 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1877 goto fatal_err; 1878 } 1879 1880 CBS_init(&cert_status, s->internal->init_msg, s->internal->init_num); 1881 if (!CBS_get_u8(&cert_status, &status_type) || 1882 CBS_len(&cert_status) < 3) { 1883 /* need at least status type + length */ 1884 al = SSL_AD_DECODE_ERROR; 1885 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1886 goto fatal_err; 1887 } 1888 1889 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1890 al = SSL_AD_DECODE_ERROR; 1891 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1892 goto fatal_err; 1893 } 1894 1895 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1896 CBS_len(&cert_status) != 0) { 1897 al = SSL_AD_DECODE_ERROR; 1898 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1899 goto fatal_err; 1900 } 1901 1902 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1903 &s->internal->tlsext_ocsp_resp_len)) { 1904 al = SSL_AD_INTERNAL_ERROR; 1905 SSLerror(s, ERR_R_MALLOC_FAILURE); 1906 goto fatal_err; 1907 } 1908 1909 if (s->ctx->internal->tlsext_status_cb) { 1910 int ret; 1911 ret = s->ctx->internal->tlsext_status_cb(s, 1912 s->ctx->internal->tlsext_status_arg); 1913 if (ret == 0) { 1914 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1915 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1916 goto fatal_err; 1917 } 1918 if (ret < 0) { 1919 al = SSL_AD_INTERNAL_ERROR; 1920 SSLerror(s, ERR_R_MALLOC_FAILURE); 1921 goto fatal_err; 1922 } 1923 } 1924 return (1); 1925 fatal_err: 1926 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1927 return (-1); 1928 } 1929 1930 int 1931 ssl3_get_server_done(SSL *s) 1932 { 1933 int ret; 1934 1935 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1936 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1937 30 /* should be very small, like 0 :-) */)) <= 0) 1938 return ret; 1939 1940 if (s->internal->init_num != 0) { 1941 /* should contain no data */ 1942 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1943 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1944 return -1; 1945 } 1946 1947 return 1; 1948 } 1949 1950 static int 1951 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1952 { 1953 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1954 unsigned char *enc_pms = NULL; 1955 EVP_PKEY *pkey = NULL; 1956 int ret = -1; 1957 int enc_len; 1958 CBB epms; 1959 1960 /* 1961 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1962 */ 1963 1964 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA].x509); 1965 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1966 pkey->pkey.rsa == NULL) { 1967 SSLerror(s, ERR_R_INTERNAL_ERROR); 1968 goto err; 1969 } 1970 1971 /* XXX - our max protocol version. */ 1972 pms[0] = s->client_version >> 8; 1973 pms[1] = s->client_version & 0xff; 1974 arc4random_buf(&pms[2], sizeof(pms) - 2); 1975 1976 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1977 SSLerror(s, ERR_R_MALLOC_FAILURE); 1978 goto err; 1979 } 1980 1981 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 1982 RSA_PKCS1_PADDING); 1983 if (enc_len <= 0) { 1984 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1985 goto err; 1986 } 1987 1988 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1989 goto err; 1990 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 1991 goto err; 1992 if (!CBB_flush(cbb)) 1993 goto err; 1994 1995 if (!tls12_derive_master_secret(s, pms, sizeof(pms))) 1996 goto err; 1997 1998 ret = 1; 1999 2000 err: 2001 explicit_bzero(pms, sizeof(pms)); 2002 EVP_PKEY_free(pkey); 2003 free(enc_pms); 2004 2005 return (ret); 2006 } 2007 2008 static int 2009 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2010 { 2011 DH *dh_srvr = NULL, *dh_clnt = NULL; 2012 unsigned char *key = NULL; 2013 int key_size = 0, key_len; 2014 unsigned char *data; 2015 int ret = -1; 2016 CBB dh_Yc; 2017 2018 /* Ensure that we have an ephemeral key for DHE. */ 2019 if (sess_cert->peer_dh_tmp == NULL) { 2020 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2021 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 2022 goto err; 2023 } 2024 dh_srvr = sess_cert->peer_dh_tmp; 2025 2026 /* Generate a new random key. */ 2027 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2028 SSLerror(s, ERR_R_DH_LIB); 2029 goto err; 2030 } 2031 if (!DH_generate_key(dh_clnt)) { 2032 SSLerror(s, ERR_R_DH_LIB); 2033 goto err; 2034 } 2035 if ((key_size = DH_size(dh_clnt)) <= 0) { 2036 SSLerror(s, ERR_R_DH_LIB); 2037 goto err; 2038 } 2039 if ((key = malloc(key_size)) == NULL) { 2040 SSLerror(s, ERR_R_MALLOC_FAILURE); 2041 goto err; 2042 } 2043 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) { 2044 SSLerror(s, ERR_R_DH_LIB); 2045 goto err; 2046 } 2047 2048 if (!tls12_derive_master_secret(s, key, key_len)) 2049 goto err; 2050 2051 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2052 goto err; 2053 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2054 goto err; 2055 BN_bn2bin(dh_clnt->pub_key, data); 2056 if (!CBB_flush(cbb)) 2057 goto err; 2058 2059 ret = 1; 2060 2061 err: 2062 DH_free(dh_clnt); 2063 freezero(key, key_size); 2064 2065 return (ret); 2066 } 2067 2068 static int 2069 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2070 { 2071 EC_KEY *ecdh = NULL; 2072 uint8_t *key = NULL; 2073 size_t key_len = 0; 2074 int ret = -1; 2075 CBB ecpoint; 2076 2077 if ((ecdh = EC_KEY_new()) == NULL) { 2078 SSLerror(s, ERR_R_MALLOC_FAILURE); 2079 goto err; 2080 } 2081 2082 if (!ssl_kex_generate_ecdhe_ecp(ecdh, sc->peer_nid)) 2083 goto err; 2084 2085 /* Encode our public key. */ 2086 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2087 goto err; 2088 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 2089 goto err; 2090 if (!CBB_flush(cbb)) 2091 goto err; 2092 2093 if (!ssl_kex_derive_ecdhe_ecp(ecdh, sc->peer_ecdh_tmp, &key, &key_len)) 2094 goto err; 2095 if (!tls12_derive_master_secret(s, key, key_len)) 2096 goto err; 2097 2098 ret = 1; 2099 2100 err: 2101 freezero(key, key_len); 2102 EC_KEY_free(ecdh); 2103 2104 return (ret); 2105 } 2106 2107 static int 2108 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2109 { 2110 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2111 int ret = -1; 2112 CBB ecpoint; 2113 2114 /* Generate X25519 key pair and derive shared key. */ 2115 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2116 goto err; 2117 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2118 goto err; 2119 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2120 goto err; 2121 X25519_keypair(public_key, private_key); 2122 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2123 goto err; 2124 2125 /* Serialize the public key. */ 2126 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2127 goto err; 2128 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2129 goto err; 2130 if (!CBB_flush(cbb)) 2131 goto err; 2132 2133 if (!tls12_derive_master_secret(s, shared_key, X25519_KEY_LENGTH)) 2134 goto err; 2135 2136 ret = 1; 2137 2138 err: 2139 free(public_key); 2140 freezero(private_key, X25519_KEY_LENGTH); 2141 freezero(shared_key, X25519_KEY_LENGTH); 2142 2143 return (ret); 2144 } 2145 2146 static int 2147 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2148 { 2149 if (sc->peer_x25519_tmp != NULL) { 2150 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2151 goto err; 2152 } else if (sc->peer_ecdh_tmp != NULL) { 2153 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2154 goto err; 2155 } else { 2156 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2157 SSLerror(s, ERR_R_INTERNAL_ERROR); 2158 goto err; 2159 } 2160 2161 return (1); 2162 2163 err: 2164 return (-1); 2165 } 2166 2167 static int 2168 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2169 { 2170 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2171 EVP_PKEY *pub_key = NULL; 2172 EVP_PKEY_CTX *pkey_ctx; 2173 X509 *peer_cert; 2174 size_t msglen; 2175 unsigned int md_len; 2176 EVP_MD_CTX *ukm_hash; 2177 int ret = -1; 2178 int nid; 2179 CBB gostblob; 2180 2181 /* Get server sertificate PKEY and create ctx from it */ 2182 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2183 if (peer_cert == NULL) { 2184 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2185 goto err; 2186 } 2187 2188 pub_key = X509_get_pubkey(peer_cert); 2189 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2190 2191 /* 2192 * If we have send a certificate, and certificate key parameters match 2193 * those of server certificate, use certificate key for key exchange. 2194 * Otherwise, generate ephemeral key pair. 2195 */ 2196 EVP_PKEY_encrypt_init(pkey_ctx); 2197 2198 /* Generate session key. */ 2199 arc4random_buf(premaster_secret, 32); 2200 2201 /* 2202 * If we have client certificate, use its secret as peer key. 2203 */ 2204 if (S3I(s)->hs.tls12.cert_request && s->cert->key->privatekey) { 2205 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2206 s->cert->key->privatekey) <=0) { 2207 /* 2208 * If there was an error - just ignore it. 2209 * Ephemeral key would be used. 2210 */ 2211 ERR_clear_error(); 2212 } 2213 } 2214 2215 /* 2216 * Compute shared IV and store it in algorithm-specific context data. 2217 */ 2218 ukm_hash = EVP_MD_CTX_new(); 2219 if (ukm_hash == NULL) { 2220 SSLerror(s, ERR_R_MALLOC_FAILURE); 2221 goto err; 2222 } 2223 2224 /* XXX check handshake hash instead. */ 2225 if (S3I(s)->hs.cipher->algorithm2 & SSL_HANDSHAKE_MAC_GOST94) 2226 nid = NID_id_GostR3411_94; 2227 else 2228 nid = NID_id_tc26_gost3411_2012_256; 2229 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2230 goto err; 2231 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2232 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2233 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2234 EVP_MD_CTX_free(ukm_hash); 2235 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2236 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2237 SSLerror(s, SSL_R_LIBRARY_BUG); 2238 goto err; 2239 } 2240 2241 /* 2242 * Make GOST keytransport blob message, encapsulate it into sequence. 2243 */ 2244 msglen = 255; 2245 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2246 32) < 0) { 2247 SSLerror(s, SSL_R_LIBRARY_BUG); 2248 goto err; 2249 } 2250 2251 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2252 goto err; 2253 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2254 goto err; 2255 if (!CBB_flush(cbb)) 2256 goto err; 2257 2258 /* Check if pubkey from client certificate was used. */ 2259 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2260 NULL) > 0) { 2261 /* Set flag "skip certificate verify". */ 2262 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2263 } 2264 EVP_PKEY_CTX_free(pkey_ctx); 2265 2266 if (!tls12_derive_master_secret(s, premaster_secret, 32)) 2267 goto err; 2268 2269 ret = 1; 2270 2271 err: 2272 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2273 EVP_PKEY_free(pub_key); 2274 2275 return (ret); 2276 } 2277 2278 int 2279 ssl3_send_client_key_exchange(SSL *s) 2280 { 2281 SESS_CERT *sess_cert; 2282 unsigned long alg_k; 2283 CBB cbb, kex; 2284 2285 memset(&cbb, 0, sizeof(cbb)); 2286 2287 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2288 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2289 2290 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2291 ssl3_send_alert(s, SSL3_AL_FATAL, 2292 SSL_AD_UNEXPECTED_MESSAGE); 2293 SSLerror(s, ERR_R_INTERNAL_ERROR); 2294 goto err; 2295 } 2296 2297 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2298 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2299 goto err; 2300 2301 if (alg_k & SSL_kRSA) { 2302 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2303 goto err; 2304 } else if (alg_k & SSL_kDHE) { 2305 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2306 goto err; 2307 } else if (alg_k & SSL_kECDHE) { 2308 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2309 goto err; 2310 } else if (alg_k & SSL_kGOST) { 2311 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2312 goto err; 2313 } else { 2314 ssl3_send_alert(s, SSL3_AL_FATAL, 2315 SSL_AD_HANDSHAKE_FAILURE); 2316 SSLerror(s, ERR_R_INTERNAL_ERROR); 2317 goto err; 2318 } 2319 2320 if (!ssl3_handshake_msg_finish(s, &cbb)) 2321 goto err; 2322 2323 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2324 } 2325 2326 /* SSL3_ST_CW_KEY_EXCH_B */ 2327 return (ssl3_handshake_write(s)); 2328 2329 err: 2330 CBB_cleanup(&cbb); 2331 2332 return (-1); 2333 } 2334 2335 static int 2336 ssl3_send_client_verify_sigalgs(SSL *s, EVP_PKEY *pkey, 2337 const struct ssl_sigalg *sigalg, CBB *cert_verify) 2338 { 2339 CBB cbb_signature; 2340 EVP_PKEY_CTX *pctx = NULL; 2341 EVP_MD_CTX mctx; 2342 const unsigned char *hdata; 2343 unsigned char *signature = NULL; 2344 size_t signature_len, hdata_len; 2345 int ret = 0; 2346 2347 EVP_MD_CTX_init(&mctx); 2348 2349 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2350 SSLerror(s, ERR_R_INTERNAL_ERROR); 2351 goto err; 2352 } 2353 if (!EVP_DigestSignInit(&mctx, &pctx, sigalg->md(), NULL, pkey)) { 2354 SSLerror(s, ERR_R_EVP_LIB); 2355 goto err; 2356 } 2357 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2358 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2359 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2360 SSLerror(s, ERR_R_EVP_LIB); 2361 goto err; 2362 } 2363 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2364 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2365 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2366 SSLerror(s, ERR_R_EVP_LIB); 2367 goto err; 2368 } 2369 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2370 SSLerror(s, ERR_R_EVP_LIB); 2371 goto err; 2372 } 2373 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2374 signature_len == 0) { 2375 SSLerror(s, ERR_R_EVP_LIB); 2376 goto err; 2377 } 2378 if ((signature = calloc(1, signature_len)) == NULL) { 2379 SSLerror(s, ERR_R_MALLOC_FAILURE); 2380 goto err; 2381 } 2382 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2383 SSLerror(s, ERR_R_EVP_LIB); 2384 goto err; 2385 } 2386 2387 if (!CBB_add_u16(cert_verify, sigalg->value)) 2388 goto err; 2389 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2390 goto err; 2391 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2392 goto err; 2393 if (!CBB_flush(cert_verify)) 2394 goto err; 2395 2396 ret = 1; 2397 2398 err: 2399 EVP_MD_CTX_cleanup(&mctx); 2400 free(signature); 2401 return ret; 2402 } 2403 2404 static int 2405 ssl3_send_client_verify_rsa(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2406 { 2407 CBB cbb_signature; 2408 unsigned char data[EVP_MAX_MD_SIZE]; 2409 unsigned char *signature = NULL; 2410 unsigned int signature_len; 2411 size_t data_len; 2412 int ret = 0; 2413 2414 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2415 goto err; 2416 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2417 goto err; 2418 if (RSA_sign(NID_md5_sha1, data, data_len, signature, 2419 &signature_len, pkey->pkey.rsa) <= 0 ) { 2420 SSLerror(s, ERR_R_RSA_LIB); 2421 goto err; 2422 } 2423 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 err: 2433 free(signature); 2434 return ret; 2435 } 2436 2437 static int 2438 ssl3_send_client_verify_ec(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2439 { 2440 CBB cbb_signature; 2441 unsigned char data[EVP_MAX_MD_SIZE]; 2442 unsigned char *signature = NULL; 2443 unsigned int signature_len; 2444 int ret = 0; 2445 2446 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2447 goto err; 2448 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2449 goto err; 2450 if (!ECDSA_sign(pkey->save_type, &data[MD5_DIGEST_LENGTH], 2451 SHA_DIGEST_LENGTH, signature, &signature_len, pkey->pkey.ec)) { 2452 SSLerror(s, ERR_R_ECDSA_LIB); 2453 goto err; 2454 } 2455 2456 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2457 goto err; 2458 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2459 goto err; 2460 if (!CBB_flush(cert_verify)) 2461 goto err; 2462 2463 ret = 1; 2464 err: 2465 free(signature); 2466 return ret; 2467 } 2468 2469 #ifndef OPENSSL_NO_GOST 2470 static int 2471 ssl3_send_client_verify_gost(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2472 { 2473 CBB cbb_signature; 2474 EVP_MD_CTX mctx; 2475 EVP_PKEY_CTX *pctx; 2476 const EVP_MD *md; 2477 const unsigned char *hdata; 2478 unsigned char *signature = NULL; 2479 size_t signature_len; 2480 size_t hdata_len; 2481 int nid; 2482 int ret = 0; 2483 2484 EVP_MD_CTX_init(&mctx); 2485 2486 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2487 SSLerror(s, ERR_R_INTERNAL_ERROR); 2488 goto err; 2489 } 2490 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2491 (md = EVP_get_digestbynid(nid)) == NULL) { 2492 SSLerror(s, ERR_R_EVP_LIB); 2493 goto err; 2494 } 2495 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2496 SSLerror(s, ERR_R_EVP_LIB); 2497 goto err; 2498 } 2499 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2500 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2501 SSLerror(s, ERR_R_EVP_LIB); 2502 goto err; 2503 } 2504 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2505 SSLerror(s, ERR_R_EVP_LIB); 2506 goto err; 2507 } 2508 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2509 signature_len == 0) { 2510 SSLerror(s, ERR_R_EVP_LIB); 2511 goto err; 2512 } 2513 if ((signature = calloc(1, signature_len)) == NULL) { 2514 SSLerror(s, ERR_R_MALLOC_FAILURE); 2515 goto err; 2516 } 2517 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2518 SSLerror(s, ERR_R_EVP_LIB); 2519 goto err; 2520 } 2521 2522 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2523 goto err; 2524 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2525 goto err; 2526 if (!CBB_flush(cert_verify)) 2527 goto err; 2528 2529 ret = 1; 2530 err: 2531 EVP_MD_CTX_cleanup(&mctx); 2532 free(signature); 2533 return ret; 2534 } 2535 #endif 2536 2537 int 2538 ssl3_send_client_verify(SSL *s) 2539 { 2540 const struct ssl_sigalg *sigalg; 2541 CBB cbb, cert_verify; 2542 EVP_PKEY *pkey; 2543 2544 memset(&cbb, 0, sizeof(cbb)); 2545 2546 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2547 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2548 SSL3_MT_CERTIFICATE_VERIFY)) 2549 goto err; 2550 2551 pkey = s->cert->key->privatekey; 2552 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2553 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2554 goto err; 2555 } 2556 S3I(s)->hs.our_sigalg = sigalg; 2557 2558 /* 2559 * For TLS v1.2 send signature algorithm and signature using 2560 * agreed digest and cached handshake records. 2561 */ 2562 if (SSL_USE_SIGALGS(s)) { 2563 if (!ssl3_send_client_verify_sigalgs(s, pkey, sigalg, 2564 &cert_verify)) 2565 goto err; 2566 } else if (pkey->type == EVP_PKEY_RSA) { 2567 if (!ssl3_send_client_verify_rsa(s, pkey, &cert_verify)) 2568 goto err; 2569 } else if (pkey->type == EVP_PKEY_EC) { 2570 if (!ssl3_send_client_verify_ec(s, pkey, &cert_verify)) 2571 goto err; 2572 #ifndef OPENSSL_NO_GOST 2573 } else if (pkey->type == NID_id_GostR3410_94 || 2574 pkey->type == NID_id_GostR3410_2001) { 2575 if (!ssl3_send_client_verify_gost(s, pkey, &cert_verify)) 2576 goto err; 2577 #endif 2578 } else { 2579 SSLerror(s, ERR_R_INTERNAL_ERROR); 2580 goto err; 2581 } 2582 2583 tls1_transcript_free(s); 2584 2585 if (!ssl3_handshake_msg_finish(s, &cbb)) 2586 goto err; 2587 2588 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2589 } 2590 2591 return (ssl3_handshake_write(s)); 2592 2593 err: 2594 CBB_cleanup(&cbb); 2595 2596 return (-1); 2597 } 2598 2599 int 2600 ssl3_send_client_certificate(SSL *s) 2601 { 2602 EVP_PKEY *pkey = NULL; 2603 X509 *x509 = NULL; 2604 CBB cbb, client_cert; 2605 int i; 2606 2607 memset(&cbb, 0, sizeof(cbb)); 2608 2609 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2610 if (s->cert->key->x509 == NULL || 2611 s->cert->key->privatekey == NULL) 2612 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2613 else 2614 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2615 } 2616 2617 /* We need to get a client cert */ 2618 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2619 /* 2620 * If we get an error, we need to 2621 * ssl->internal->rwstate = SSL_X509_LOOKUP; return(-1); 2622 * We then get retried later. 2623 */ 2624 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2625 if (i < 0) { 2626 s->internal->rwstate = SSL_X509_LOOKUP; 2627 return (-1); 2628 } 2629 s->internal->rwstate = SSL_NOTHING; 2630 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2631 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2632 if (!SSL_use_certificate(s, x509) || 2633 !SSL_use_PrivateKey(s, pkey)) 2634 i = 0; 2635 } else if (i == 1) { 2636 i = 0; 2637 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2638 } 2639 2640 X509_free(x509); 2641 EVP_PKEY_free(pkey); 2642 if (i == 0) { 2643 S3I(s)->hs.tls12.cert_request = 2; 2644 2645 /* There is no client certificate to verify. */ 2646 tls1_transcript_free(s); 2647 } 2648 2649 /* Ok, we have a cert */ 2650 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2651 } 2652 2653 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2654 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2655 SSL3_MT_CERTIFICATE)) 2656 goto err; 2657 if (!ssl3_output_cert_chain(s, &client_cert, 2658 (S3I(s)->hs.tls12.cert_request == 2) ? NULL : s->cert->key)) 2659 goto err; 2660 if (!ssl3_handshake_msg_finish(s, &cbb)) 2661 goto err; 2662 2663 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2664 } 2665 2666 /* SSL3_ST_CW_CERT_D */ 2667 return (ssl3_handshake_write(s)); 2668 2669 err: 2670 CBB_cleanup(&cbb); 2671 2672 return (0); 2673 } 2674 2675 #define has_bits(i,m) (((i)&(m)) == (m)) 2676 2677 int 2678 ssl3_check_cert_and_algorithm(SSL *s) 2679 { 2680 int i, idx; 2681 long alg_k, alg_a; 2682 EVP_PKEY *pkey = NULL; 2683 SESS_CERT *sc; 2684 DH *dh; 2685 2686 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2687 alg_a = S3I(s)->hs.cipher->algorithm_auth; 2688 2689 /* We don't have a certificate. */ 2690 if (alg_a & SSL_aNULL) 2691 return (1); 2692 2693 sc = SSI(s)->sess_cert; 2694 if (sc == NULL) { 2695 SSLerror(s, ERR_R_INTERNAL_ERROR); 2696 goto err; 2697 } 2698 dh = SSI(s)->sess_cert->peer_dh_tmp; 2699 2700 /* This is the passed certificate. */ 2701 2702 idx = sc->peer_cert_type; 2703 if (idx == SSL_PKEY_ECC) { 2704 if (ssl_check_srvr_ecc_cert_and_alg( 2705 sc->peer_pkeys[idx].x509, s) == 0) { 2706 /* check failed */ 2707 SSLerror(s, SSL_R_BAD_ECC_CERT); 2708 goto fatal_err; 2709 } else { 2710 return (1); 2711 } 2712 } 2713 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2714 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2715 EVP_PKEY_free(pkey); 2716 2717 /* Check that we have a certificate if we require one. */ 2718 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2719 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2720 goto fatal_err; 2721 } 2722 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2723 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2724 goto fatal_err; 2725 } 2726 if ((alg_k & SSL_kDHE) && 2727 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2728 SSLerror(s, SSL_R_MISSING_DH_KEY); 2729 goto fatal_err; 2730 } 2731 2732 return (1); 2733 fatal_err: 2734 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2735 err: 2736 return (0); 2737 } 2738 2739 /* 2740 * Check to see if handshake is full or resumed. Usually this is just a 2741 * case of checking to see if a cache hit has occurred. In the case of 2742 * session tickets we have to check the next message to be sure. 2743 */ 2744 2745 int 2746 ssl3_check_finished(SSL *s) 2747 { 2748 int ret; 2749 2750 /* If we have no ticket it cannot be a resumed session. */ 2751 if (!s->session->tlsext_tick) 2752 return (1); 2753 /* this function is called when we really expect a Certificate 2754 * message, so permit appropriate message length */ 2755 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2756 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list)) <= 0) 2757 return ret; 2758 2759 S3I(s)->hs.tls12.reuse_message = 1; 2760 if ((S3I(s)->hs.tls12.message_type == SSL3_MT_FINISHED) || 2761 (S3I(s)->hs.tls12.message_type == SSL3_MT_NEWSESSION_TICKET)) 2762 return (2); 2763 2764 return (1); 2765 } 2766 2767 int 2768 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2769 { 2770 int i = 0; 2771 2772 #ifndef OPENSSL_NO_ENGINE 2773 if (s->ctx->internal->client_cert_engine) { 2774 i = ENGINE_load_ssl_client_cert( 2775 s->ctx->internal->client_cert_engine, s, 2776 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2777 if (i != 0) 2778 return (i); 2779 } 2780 #endif 2781 if (s->ctx->internal->client_cert_cb) 2782 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2783 return (i); 2784 } 2785