1 /* $OpenBSD: ssl_clnt.c,v 1.153 2022/08/17 07:39:19 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 = s->s3->hs.state; 194 195 switch (s->s3->hs.state) { 196 case SSL_ST_RENEGOTIATE: 197 s->internal->renegotiate = 1; 198 s->s3->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 &s->s3->hs.our_min_tls_version, 218 &s->s3->hs.our_max_tls_version)) { 219 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 220 ret = -1; 221 goto end; 222 } 223 224 if (!ssl_security_version(s, 225 s->s3->hs.our_min_tls_version)) { 226 SSLerror(s, SSL_R_VERSION_TOO_LOW); 227 ret = -1; 228 goto end; 229 } 230 231 if (!ssl3_setup_init_buffer(s)) { 232 ret = -1; 233 goto end; 234 } 235 if (!ssl3_setup_buffers(s)) { 236 ret = -1; 237 goto end; 238 } 239 if (!ssl_init_wbio_buffer(s, 0)) { 240 ret = -1; 241 goto end; 242 } 243 244 /* don't push the buffering BIO quite yet */ 245 246 if (!tls1_transcript_init(s)) { 247 ret = -1; 248 goto end; 249 } 250 251 s->s3->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 252 s->ctx->internal->stats.sess_connect++; 253 s->internal->init_num = 0; 254 255 if (SSL_is_dtls(s)) { 256 /* mark client_random uninitialized */ 257 memset(s->s3->client_random, 0, 258 sizeof(s->s3->client_random)); 259 s->d1->send_cookie = 0; 260 s->internal->hit = 0; 261 } 262 break; 263 264 case SSL3_ST_CW_CLNT_HELLO_A: 265 case SSL3_ST_CW_CLNT_HELLO_B: 266 s->internal->shutdown = 0; 267 268 if (SSL_is_dtls(s)) { 269 /* every DTLS ClientHello resets Finished MAC */ 270 tls1_transcript_reset(s); 271 272 dtls1_start_timer(s); 273 } 274 275 ret = ssl3_send_client_hello(s); 276 if (ret <= 0) 277 goto end; 278 279 if (SSL_is_dtls(s) && s->d1->send_cookie) { 280 s->s3->hs.state = SSL3_ST_CW_FLUSH; 281 s->s3->hs.tls12.next_state = SSL3_ST_CR_SRVR_HELLO_A; 282 } else 283 s->s3->hs.state = SSL3_ST_CR_SRVR_HELLO_A; 284 285 s->internal->init_num = 0; 286 287 /* turn on buffering for the next lot of output */ 288 if (s->bbio != s->wbio) 289 s->wbio = BIO_push(s->bbio, s->wbio); 290 291 break; 292 293 case SSL3_ST_CR_SRVR_HELLO_A: 294 case SSL3_ST_CR_SRVR_HELLO_B: 295 ret = ssl3_get_server_hello(s); 296 if (ret <= 0) 297 goto end; 298 299 if (s->internal->hit) { 300 s->s3->hs.state = SSL3_ST_CR_FINISHED_A; 301 if (!SSL_is_dtls(s)) { 302 if (s->internal->tlsext_ticket_expected) { 303 /* receive renewed session ticket */ 304 s->s3->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 305 } 306 307 /* No client certificate verification. */ 308 tls1_transcript_free(s); 309 } 310 } else if (SSL_is_dtls(s)) { 311 s->s3->hs.state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 312 } else { 313 s->s3->hs.state = SSL3_ST_CR_CERT_A; 314 } 315 s->internal->init_num = 0; 316 break; 317 318 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 319 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 320 ret = ssl3_get_dtls_hello_verify(s); 321 if (ret <= 0) 322 goto end; 323 dtls1_stop_timer(s); 324 if (s->d1->send_cookie) /* start again, with a cookie */ 325 s->s3->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 326 else 327 s->s3->hs.state = SSL3_ST_CR_CERT_A; 328 s->internal->init_num = 0; 329 break; 330 331 case SSL3_ST_CR_CERT_A: 332 case SSL3_ST_CR_CERT_B: 333 ret = ssl3_check_finished(s); 334 if (ret <= 0) 335 goto end; 336 if (ret == 2) { 337 s->internal->hit = 1; 338 if (s->internal->tlsext_ticket_expected) 339 s->s3->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 340 else 341 s->s3->hs.state = SSL3_ST_CR_FINISHED_A; 342 s->internal->init_num = 0; 343 break; 344 } 345 /* Check if it is anon DH/ECDH. */ 346 if (!(s->s3->hs.cipher->algorithm_auth & 347 SSL_aNULL)) { 348 ret = ssl3_get_server_certificate(s); 349 if (ret <= 0) 350 goto end; 351 if (s->internal->tlsext_status_expected) 352 s->s3->hs.state = SSL3_ST_CR_CERT_STATUS_A; 353 else 354 s->s3->hs.state = SSL3_ST_CR_KEY_EXCH_A; 355 } else { 356 skip = 1; 357 s->s3->hs.state = SSL3_ST_CR_KEY_EXCH_A; 358 } 359 s->internal->init_num = 0; 360 break; 361 362 case SSL3_ST_CR_KEY_EXCH_A: 363 case SSL3_ST_CR_KEY_EXCH_B: 364 ret = ssl3_get_server_key_exchange(s); 365 if (ret <= 0) 366 goto end; 367 s->s3->hs.state = SSL3_ST_CR_CERT_REQ_A; 368 s->internal->init_num = 0; 369 370 /* 371 * At this point we check that we have the 372 * required stuff from the server. 373 */ 374 if (!ssl3_check_cert_and_algorithm(s)) { 375 ret = -1; 376 goto end; 377 } 378 break; 379 380 case SSL3_ST_CR_CERT_REQ_A: 381 case SSL3_ST_CR_CERT_REQ_B: 382 ret = ssl3_get_certificate_request(s); 383 if (ret <= 0) 384 goto end; 385 s->s3->hs.state = SSL3_ST_CR_SRVR_DONE_A; 386 s->internal->init_num = 0; 387 break; 388 389 case SSL3_ST_CR_SRVR_DONE_A: 390 case SSL3_ST_CR_SRVR_DONE_B: 391 ret = ssl3_get_server_done(s); 392 if (ret <= 0) 393 goto end; 394 if (SSL_is_dtls(s)) 395 dtls1_stop_timer(s); 396 if (s->s3->hs.tls12.cert_request) 397 s->s3->hs.state = SSL3_ST_CW_CERT_A; 398 else 399 s->s3->hs.state = SSL3_ST_CW_KEY_EXCH_A; 400 s->internal->init_num = 0; 401 402 break; 403 404 case SSL3_ST_CW_CERT_A: 405 case SSL3_ST_CW_CERT_B: 406 case SSL3_ST_CW_CERT_C: 407 case SSL3_ST_CW_CERT_D: 408 if (SSL_is_dtls(s)) 409 dtls1_start_timer(s); 410 ret = ssl3_send_client_certificate(s); 411 if (ret <= 0) 412 goto end; 413 s->s3->hs.state = SSL3_ST_CW_KEY_EXCH_A; 414 s->internal->init_num = 0; 415 break; 416 417 case SSL3_ST_CW_KEY_EXCH_A: 418 case SSL3_ST_CW_KEY_EXCH_B: 419 if (SSL_is_dtls(s)) 420 dtls1_start_timer(s); 421 ret = ssl3_send_client_key_exchange(s); 422 if (ret <= 0) 423 goto end; 424 /* 425 * EAY EAY EAY need to check for DH fix cert 426 * sent back 427 */ 428 /* 429 * For TLS, cert_req is set to 2, so a cert chain 430 * of nothing is sent, but no verify packet is sent 431 */ 432 /* 433 * XXX: For now, we do not support client 434 * authentication in ECDH cipher suites with 435 * ECDH (rather than ECDSA) certificates. 436 * We need to skip the certificate verify 437 * message when client's ECDH public key is sent 438 * inside the client certificate. 439 */ 440 if (s->s3->hs.tls12.cert_request == 1) { 441 s->s3->hs.state = SSL3_ST_CW_CERT_VRFY_A; 442 } else { 443 s->s3->hs.state = SSL3_ST_CW_CHANGE_A; 444 s->s3->change_cipher_spec = 0; 445 } 446 if (!SSL_is_dtls(s)) { 447 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 448 s->s3->hs.state = SSL3_ST_CW_CHANGE_A; 449 s->s3->change_cipher_spec = 0; 450 } 451 } 452 453 s->internal->init_num = 0; 454 break; 455 456 case SSL3_ST_CW_CERT_VRFY_A: 457 case SSL3_ST_CW_CERT_VRFY_B: 458 if (SSL_is_dtls(s)) 459 dtls1_start_timer(s); 460 ret = ssl3_send_client_verify(s); 461 if (ret <= 0) 462 goto end; 463 s->s3->hs.state = SSL3_ST_CW_CHANGE_A; 464 s->internal->init_num = 0; 465 s->s3->change_cipher_spec = 0; 466 break; 467 468 case SSL3_ST_CW_CHANGE_A: 469 case SSL3_ST_CW_CHANGE_B: 470 if (SSL_is_dtls(s) && !s->internal->hit) 471 dtls1_start_timer(s); 472 ret = ssl3_send_change_cipher_spec(s, 473 SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B); 474 if (ret <= 0) 475 goto end; 476 477 s->s3->hs.state = SSL3_ST_CW_FINISHED_A; 478 s->internal->init_num = 0; 479 s->session->cipher = s->s3->hs.cipher; 480 481 if (!tls1_setup_key_block(s)) { 482 ret = -1; 483 goto end; 484 } 485 if (!tls1_change_write_cipher_state(s)) { 486 ret = -1; 487 goto end; 488 } 489 break; 490 491 case SSL3_ST_CW_FINISHED_A: 492 case SSL3_ST_CW_FINISHED_B: 493 if (SSL_is_dtls(s) && !s->internal->hit) 494 dtls1_start_timer(s); 495 ret = ssl3_send_finished(s, SSL3_ST_CW_FINISHED_A, 496 SSL3_ST_CW_FINISHED_B); 497 if (ret <= 0) 498 goto end; 499 if (!SSL_is_dtls(s)) 500 s->s3->flags |= SSL3_FLAGS_CCS_OK; 501 s->s3->hs.state = SSL3_ST_CW_FLUSH; 502 503 /* clear flags */ 504 if (s->internal->hit) { 505 s->s3->hs.tls12.next_state = SSL_ST_OK; 506 } else { 507 /* Allow NewSessionTicket if ticket expected */ 508 if (s->internal->tlsext_ticket_expected) 509 s->s3->hs.tls12.next_state = 510 SSL3_ST_CR_SESSION_TICKET_A; 511 else 512 s->s3->hs.tls12.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 s->s3->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 s->s3->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 s->d1->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 s->s3->hs.state = SSL3_ST_CW_CHANGE_A; 551 else 552 s->s3->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 s->s3->hs.state = s->s3->hs.tls12.next_state; 564 } 565 } 566 ret = -1; 567 goto end; 568 } 569 s->internal->rwstate = SSL_NOTHING; 570 s->s3->hs.state = s->s3->hs.tls12.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 (s->s3->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 ssl_info_callback(s, SSL_CB_HANDSHAKE_DONE, 1); 602 603 if (SSL_is_dtls(s)) { 604 /* done with handshaking */ 605 s->d1->handshake_read_seq = 0; 606 s->d1->next_handshake_write_seq = 0; 607 } 608 609 goto end; 610 /* break; */ 611 612 default: 613 SSLerror(s, SSL_R_UNKNOWN_STATE); 614 ret = -1; 615 goto end; 616 /* break; */ 617 } 618 619 /* did we do anything */ 620 if (!s->s3->hs.tls12.reuse_message && !skip) { 621 if (s->internal->debug) { 622 if ((ret = BIO_flush(s->wbio)) <= 0) 623 goto end; 624 } 625 626 if (s->s3->hs.state != state) { 627 new_state = s->s3->hs.state; 628 s->s3->hs.state = state; 629 ssl_info_callback(s, SSL_CB_CONNECT_LOOP, 1); 630 s->s3->hs.state = new_state; 631 } 632 } 633 skip = 0; 634 } 635 636 end: 637 s->internal->in_handshake--; 638 ssl_info_callback(s, SSL_CB_CONNECT_EXIT, ret); 639 640 return (ret); 641 } 642 643 int 644 ssl3_send_client_hello(SSL *s) 645 { 646 CBB cbb, client_hello, session_id, cookie, cipher_suites; 647 CBB compression_methods; 648 uint16_t max_version; 649 size_t sl; 650 651 memset(&cbb, 0, sizeof(cbb)); 652 653 if (s->s3->hs.state == SSL3_ST_CW_CLNT_HELLO_A) { 654 SSL_SESSION *sess = s->session; 655 656 if (!ssl_max_supported_version(s, &max_version)) { 657 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 658 return (-1); 659 } 660 s->version = max_version; 661 662 if (sess == NULL || sess->ssl_version != s->version || 663 (sess->session_id_length == 0 && sess->tlsext_tick == NULL) || 664 sess->not_resumable) { 665 if (!ssl_get_new_session(s, 0)) 666 goto err; 667 } 668 /* else use the pre-loaded session */ 669 670 /* 671 * If a DTLS ClientHello message is being resent after a 672 * HelloVerifyRequest, we must retain the original client 673 * random value. 674 */ 675 if (!SSL_is_dtls(s) || s->d1->send_cookie == 0) 676 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE); 677 678 if (!ssl3_handshake_msg_start(s, &cbb, &client_hello, 679 SSL3_MT_CLIENT_HELLO)) 680 goto err; 681 682 if (!CBB_add_u16(&client_hello, s->version)) 683 goto err; 684 685 /* Random stuff */ 686 if (!CBB_add_bytes(&client_hello, s->s3->client_random, 687 sizeof(s->s3->client_random))) 688 goto err; 689 690 /* Session ID */ 691 if (!CBB_add_u8_length_prefixed(&client_hello, &session_id)) 692 goto err; 693 if (!s->internal->new_session && 694 s->session->session_id_length > 0) { 695 sl = s->session->session_id_length; 696 if (sl > sizeof(s->session->session_id)) { 697 SSLerror(s, ERR_R_INTERNAL_ERROR); 698 goto err; 699 } 700 if (!CBB_add_bytes(&session_id, 701 s->session->session_id, sl)) 702 goto err; 703 } 704 705 /* DTLS Cookie. */ 706 if (SSL_is_dtls(s)) { 707 if (s->d1->cookie_len > sizeof(s->d1->cookie)) { 708 SSLerror(s, ERR_R_INTERNAL_ERROR); 709 goto err; 710 } 711 if (!CBB_add_u8_length_prefixed(&client_hello, &cookie)) 712 goto err; 713 if (!CBB_add_bytes(&cookie, s->d1->cookie, 714 s->d1->cookie_len)) 715 goto err; 716 } 717 718 /* Ciphers supported */ 719 if (!CBB_add_u16_length_prefixed(&client_hello, &cipher_suites)) 720 return 0; 721 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), 722 &cipher_suites)) { 723 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE); 724 goto err; 725 } 726 727 /* Add in compression methods (null) */ 728 if (!CBB_add_u8_length_prefixed(&client_hello, 729 &compression_methods)) 730 goto err; 731 if (!CBB_add_u8(&compression_methods, 0)) 732 goto err; 733 734 /* TLS extensions */ 735 if (!tlsext_client_build(s, SSL_TLSEXT_MSG_CH, &client_hello)) { 736 SSLerror(s, ERR_R_INTERNAL_ERROR); 737 goto err; 738 } 739 740 if (!ssl3_handshake_msg_finish(s, &cbb)) 741 goto err; 742 743 s->s3->hs.state = SSL3_ST_CW_CLNT_HELLO_B; 744 } 745 746 /* SSL3_ST_CW_CLNT_HELLO_B */ 747 return (ssl3_handshake_write(s)); 748 749 err: 750 CBB_cleanup(&cbb); 751 752 return (-1); 753 } 754 755 int 756 ssl3_get_dtls_hello_verify(SSL *s) 757 { 758 CBS hello_verify_request, cookie; 759 size_t cookie_len; 760 uint16_t ssl_version; 761 int al, ret; 762 763 if ((ret = ssl3_get_message(s, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 764 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, s->internal->max_cert_list)) <= 0) 765 return ret; 766 767 if (s->s3->hs.tls12.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 768 s->d1->send_cookie = 0; 769 s->s3->hs.tls12.reuse_message = 1; 770 return (1); 771 } 772 773 if (s->internal->init_num < 0) 774 goto decode_err; 775 776 CBS_init(&hello_verify_request, s->internal->init_msg, 777 s->internal->init_num); 778 779 if (!CBS_get_u16(&hello_verify_request, &ssl_version)) 780 goto decode_err; 781 if (!CBS_get_u8_length_prefixed(&hello_verify_request, &cookie)) 782 goto decode_err; 783 if (CBS_len(&hello_verify_request) != 0) 784 goto decode_err; 785 786 /* 787 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should always 788 * contain DTLSv1.0 the version that is going to be negotiated. 789 * Tolerate DTLSv1.2 just in case. 790 */ 791 if (ssl_version != DTLS1_VERSION && ssl_version != DTLS1_2_VERSION) { 792 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 793 s->version = (s->version & 0xff00) | (ssl_version & 0xff); 794 al = SSL_AD_PROTOCOL_VERSION; 795 goto fatal_err; 796 } 797 798 if (!CBS_write_bytes(&cookie, s->d1->cookie, 799 sizeof(s->d1->cookie), &cookie_len)) { 800 s->d1->cookie_len = 0; 801 al = SSL_AD_ILLEGAL_PARAMETER; 802 goto fatal_err; 803 } 804 s->d1->cookie_len = cookie_len; 805 s->d1->send_cookie = 1; 806 807 return 1; 808 809 decode_err: 810 al = SSL_AD_DECODE_ERROR; 811 fatal_err: 812 ssl3_send_alert(s, SSL3_AL_FATAL, al); 813 return -1; 814 } 815 816 int 817 ssl3_get_server_hello(SSL *s) 818 { 819 CBS cbs, server_random, session_id; 820 uint16_t server_version, cipher_suite; 821 uint8_t compression_method; 822 const SSL_CIPHER *cipher; 823 const SSL_METHOD *method; 824 unsigned long alg_k; 825 int al, ret; 826 827 s->internal->first_packet = 1; 828 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 829 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000 /* ?? */)) <= 0) 830 return ret; 831 s->internal->first_packet = 0; 832 833 if (s->internal->init_num < 0) 834 goto decode_err; 835 836 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 837 838 if (SSL_is_dtls(s)) { 839 if (s->s3->hs.tls12.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 840 if (s->d1->send_cookie == 0) { 841 s->s3->hs.tls12.reuse_message = 1; 842 return (1); 843 } else { 844 /* Already sent a cookie. */ 845 al = SSL_AD_UNEXPECTED_MESSAGE; 846 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 847 goto fatal_err; 848 } 849 } 850 } 851 852 if (s->s3->hs.tls12.message_type != SSL3_MT_SERVER_HELLO) { 853 al = SSL_AD_UNEXPECTED_MESSAGE; 854 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 855 goto fatal_err; 856 } 857 858 if (!CBS_get_u16(&cbs, &server_version)) 859 goto decode_err; 860 861 if (!ssl_check_version_from_server(s, server_version)) { 862 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 863 s->version = (s->version & 0xff00) | (server_version & 0xff); 864 al = SSL_AD_PROTOCOL_VERSION; 865 goto fatal_err; 866 } 867 s->s3->hs.peer_legacy_version = server_version; 868 s->version = server_version; 869 870 s->s3->hs.negotiated_tls_version = ssl_tls_version(server_version); 871 if (s->s3->hs.negotiated_tls_version == 0) { 872 SSLerror(s, ERR_R_INTERNAL_ERROR); 873 goto err; 874 } 875 876 if ((method = ssl_get_method(server_version)) == NULL) { 877 SSLerror(s, ERR_R_INTERNAL_ERROR); 878 goto err; 879 } 880 s->method = method; 881 882 /* Server random. */ 883 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 884 goto decode_err; 885 if (!CBS_write_bytes(&server_random, s->s3->server_random, 886 sizeof(s->s3->server_random), NULL)) 887 goto err; 888 889 if (s->s3->hs.our_max_tls_version >= TLS1_2_VERSION && 890 s->s3->hs.negotiated_tls_version < s->s3->hs.our_max_tls_version) { 891 /* 892 * RFC 8446 section 4.1.3. We must not downgrade if the server 893 * random value contains the TLS 1.2 or TLS 1.1 magical value. 894 */ 895 if (!CBS_skip(&server_random, 896 CBS_len(&server_random) - sizeof(tls13_downgrade_12))) 897 goto err; 898 if (s->s3->hs.negotiated_tls_version == TLS1_2_VERSION && 899 CBS_mem_equal(&server_random, tls13_downgrade_12, 900 sizeof(tls13_downgrade_12))) { 901 al = SSL_AD_ILLEGAL_PARAMETER; 902 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 903 goto fatal_err; 904 } 905 if (CBS_mem_equal(&server_random, tls13_downgrade_11, 906 sizeof(tls13_downgrade_11))) { 907 al = SSL_AD_ILLEGAL_PARAMETER; 908 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 909 goto fatal_err; 910 } 911 } 912 913 /* Session ID. */ 914 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 915 goto decode_err; 916 917 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 918 al = SSL_AD_ILLEGAL_PARAMETER; 919 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 920 goto fatal_err; 921 } 922 923 /* Cipher suite. */ 924 if (!CBS_get_u16(&cbs, &cipher_suite)) 925 goto decode_err; 926 927 /* 928 * Check if we want to resume the session based on external 929 * pre-shared secret. 930 */ 931 if (s->internal->tls_session_secret_cb != NULL) { 932 SSL_CIPHER *pref_cipher = NULL; 933 int master_key_length = sizeof(s->session->master_key); 934 935 if (!s->internal->tls_session_secret_cb(s, 936 s->session->master_key, &master_key_length, NULL, 937 &pref_cipher, s->internal->tls_session_secret_cb_arg)) { 938 SSLerror(s, ERR_R_INTERNAL_ERROR); 939 goto err; 940 } 941 if (master_key_length <= 0) { 942 SSLerror(s, ERR_R_INTERNAL_ERROR); 943 goto err; 944 } 945 s->session->master_key_length = master_key_length; 946 947 if ((s->session->cipher = pref_cipher) == NULL) 948 s->session->cipher = 949 ssl3_get_cipher_by_value(cipher_suite); 950 s->s3->flags |= SSL3_FLAGS_CCS_OK; 951 } 952 953 if (s->session->session_id_length != 0 && 954 CBS_mem_equal(&session_id, s->session->session_id, 955 s->session->session_id_length)) { 956 if (s->sid_ctx_length != s->session->sid_ctx_length || 957 timingsafe_memcmp(s->session->sid_ctx, 958 s->sid_ctx, s->sid_ctx_length) != 0) { 959 /* actually a client application bug */ 960 al = SSL_AD_ILLEGAL_PARAMETER; 961 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 962 goto fatal_err; 963 } 964 s->s3->flags |= SSL3_FLAGS_CCS_OK; 965 s->internal->hit = 1; 966 } else { 967 /* a miss or crap from the other end */ 968 969 /* If we were trying for session-id reuse, make a new 970 * SSL_SESSION so we don't stuff up other people */ 971 s->internal->hit = 0; 972 if (s->session->session_id_length > 0) { 973 if (!ssl_get_new_session(s, 0)) { 974 al = SSL_AD_INTERNAL_ERROR; 975 goto fatal_err; 976 } 977 } 978 979 /* 980 * XXX - improve the handling for the case where there is a 981 * zero length session identifier. 982 */ 983 if (!CBS_write_bytes(&session_id, s->session->session_id, 984 sizeof(s->session->session_id), 985 &s->session->session_id_length)) 986 goto err; 987 988 s->session->ssl_version = s->version; 989 } 990 991 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 992 al = SSL_AD_ILLEGAL_PARAMETER; 993 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 994 goto fatal_err; 995 } 996 997 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 998 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 999 s->s3->hs.negotiated_tls_version < TLS1_2_VERSION) { 1000 al = SSL_AD_ILLEGAL_PARAMETER; 1001 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1002 goto fatal_err; 1003 } 1004 1005 if (!ssl_cipher_in_list(SSL_get_ciphers(s), cipher)) { 1006 /* we did not say we would use this cipher */ 1007 al = SSL_AD_ILLEGAL_PARAMETER; 1008 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1009 goto fatal_err; 1010 } 1011 1012 /* 1013 * Depending on the session caching (internal/external), the cipher 1014 * and/or cipher_id values may not be set. Make sure that 1015 * cipher_id is set and use it for comparison. 1016 */ 1017 if (s->session->cipher) 1018 s->session->cipher_id = s->session->cipher->id; 1019 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 1020 al = SSL_AD_ILLEGAL_PARAMETER; 1021 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1022 goto fatal_err; 1023 } 1024 s->s3->hs.cipher = cipher; 1025 1026 if (!tls1_transcript_hash_init(s)) 1027 goto err; 1028 1029 /* 1030 * Don't digest cached records if no sigalgs: we may need them for 1031 * client authentication. 1032 */ 1033 alg_k = s->s3->hs.cipher->algorithm_mkey; 1034 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST))) 1035 tls1_transcript_free(s); 1036 1037 if (!CBS_get_u8(&cbs, &compression_method)) 1038 goto decode_err; 1039 1040 if (compression_method != 0) { 1041 al = SSL_AD_ILLEGAL_PARAMETER; 1042 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1043 goto fatal_err; 1044 } 1045 1046 if (!tlsext_client_parse(s, SSL_TLSEXT_MSG_SH, &cbs, &al)) { 1047 SSLerror(s, SSL_R_PARSE_TLSEXT); 1048 goto fatal_err; 1049 } 1050 1051 if (CBS_len(&cbs) != 0) 1052 goto decode_err; 1053 1054 /* 1055 * Determine if we need to see RI. Strictly speaking if we want to 1056 * avoid an attack we should *always* see RI even on initial server 1057 * hello because the client doesn't see any renegotiation during an 1058 * attack. However this would mean we could not connect to any server 1059 * which doesn't support RI so for the immediate future tolerate RI 1060 * absence on initial connect only. 1061 */ 1062 if (!s->s3->renegotiate_seen && 1063 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1064 al = SSL_AD_HANDSHAKE_FAILURE; 1065 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1066 goto fatal_err; 1067 } 1068 1069 if (ssl_check_serverhello_tlsext(s) <= 0) { 1070 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1071 goto err; 1072 } 1073 1074 return (1); 1075 1076 decode_err: 1077 /* wrong packet length */ 1078 al = SSL_AD_DECODE_ERROR; 1079 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1080 fatal_err: 1081 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1082 err: 1083 return (-1); 1084 } 1085 1086 int 1087 ssl3_get_server_certificate(SSL *s) 1088 { 1089 CBS cbs, cert_list, cert_data; 1090 STACK_OF(X509) *certs = NULL; 1091 X509 *cert = NULL; 1092 const uint8_t *p; 1093 int al, ret; 1094 1095 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1096 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list)) <= 0) 1097 return ret; 1098 1099 ret = -1; 1100 1101 if (s->s3->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1102 s->s3->hs.tls12.reuse_message = 1; 1103 return (1); 1104 } 1105 1106 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE) { 1107 al = SSL_AD_UNEXPECTED_MESSAGE; 1108 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1109 goto fatal_err; 1110 } 1111 1112 if ((certs = sk_X509_new_null()) == NULL) { 1113 SSLerror(s, ERR_R_MALLOC_FAILURE); 1114 goto err; 1115 } 1116 1117 if (s->internal->init_num < 0) 1118 goto decode_err; 1119 1120 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 1121 1122 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list)) 1123 goto decode_err; 1124 if (CBS_len(&cbs) != 0) 1125 goto decode_err; 1126 1127 while (CBS_len(&cert_list) > 0) { 1128 if (!CBS_get_u24_length_prefixed(&cert_list, &cert_data)) 1129 goto decode_err; 1130 p = CBS_data(&cert_data); 1131 if ((cert = d2i_X509(NULL, &p, CBS_len(&cert_data))) == NULL) { 1132 al = SSL_AD_BAD_CERTIFICATE; 1133 SSLerror(s, ERR_R_ASN1_LIB); 1134 goto fatal_err; 1135 } 1136 if (p != CBS_data(&cert_data) + CBS_len(&cert_data)) 1137 goto decode_err; 1138 if (!sk_X509_push(certs, cert)) { 1139 SSLerror(s, ERR_R_MALLOC_FAILURE); 1140 goto err; 1141 } 1142 cert = NULL; 1143 } 1144 1145 /* A server must always provide a non-empty certificate list. */ 1146 if (sk_X509_num(certs) < 1) { 1147 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 1148 goto decode_err; 1149 } 1150 1151 if (ssl_verify_cert_chain(s, certs) <= 0 && 1152 s->verify_mode != SSL_VERIFY_NONE) { 1153 al = ssl_verify_alarm_type(s->verify_result); 1154 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1155 goto fatal_err; 1156 } 1157 s->session->verify_result = s->verify_result; 1158 ERR_clear_error(); 1159 1160 if (!tls_process_peer_certs(s, certs)) 1161 goto err; 1162 1163 ret = 1; 1164 1165 if (0) { 1166 decode_err: 1167 /* wrong packet length */ 1168 al = SSL_AD_DECODE_ERROR; 1169 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1170 fatal_err: 1171 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1172 } 1173 err: 1174 sk_X509_pop_free(certs, X509_free); 1175 X509_free(cert); 1176 1177 return (ret); 1178 } 1179 1180 static int 1181 ssl3_get_server_kex_dhe(SSL *s, CBS *cbs) 1182 { 1183 int decode_error, invalid_params, invalid_key; 1184 int nid = NID_dhKeyAgreement; 1185 1186 tls_key_share_free(s->s3->hs.key_share); 1187 if ((s->s3->hs.key_share = tls_key_share_new_nid(nid)) == NULL) 1188 goto err; 1189 1190 if (!tls_key_share_peer_params(s->s3->hs.key_share, cbs, 1191 &decode_error, &invalid_params)) { 1192 if (decode_error) { 1193 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1194 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1195 } 1196 goto err; 1197 } 1198 if (!tls_key_share_peer_public(s->s3->hs.key_share, cbs, 1199 &decode_error, &invalid_key)) { 1200 if (decode_error) { 1201 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1202 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1203 } 1204 goto err; 1205 } 1206 1207 if (invalid_params) { 1208 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1209 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1210 goto err; 1211 } 1212 if (invalid_key) { 1213 SSLerror(s, SSL_R_BAD_DH_PUB_KEY_LENGTH); 1214 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1215 goto err; 1216 } 1217 1218 if (!tls_key_share_peer_security(s, s->s3->hs.key_share)) { 1219 SSLerror(s, SSL_R_DH_KEY_TOO_SMALL); 1220 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1221 return 0; 1222 } 1223 1224 return 1; 1225 1226 err: 1227 return 0; 1228 } 1229 1230 static int 1231 ssl3_get_server_kex_ecdhe(SSL *s, CBS *cbs) 1232 { 1233 uint8_t curve_type; 1234 uint16_t group_id; 1235 int decode_error; 1236 CBS public; 1237 1238 if (!CBS_get_u8(cbs, &curve_type)) 1239 goto decode_err; 1240 if (!CBS_get_u16(cbs, &group_id)) 1241 goto decode_err; 1242 1243 /* Only named curves are supported. */ 1244 if (curve_type != NAMED_CURVE_TYPE) { 1245 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1246 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1247 goto err; 1248 } 1249 1250 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1251 goto decode_err; 1252 1253 /* 1254 * Check that the group is one of our preferences - if it is not, 1255 * the server has sent us an invalid group. 1256 */ 1257 if (!tls1_check_group(s, group_id)) { 1258 SSLerror(s, SSL_R_WRONG_CURVE); 1259 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1260 goto err; 1261 } 1262 1263 tls_key_share_free(s->s3->hs.key_share); 1264 if ((s->s3->hs.key_share = tls_key_share_new(group_id)) == NULL) 1265 goto err; 1266 1267 if (!tls_key_share_peer_public(s->s3->hs.key_share, &public, 1268 &decode_error, NULL)) { 1269 if (decode_error) 1270 goto decode_err; 1271 goto err; 1272 } 1273 1274 return 1; 1275 1276 decode_err: 1277 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1278 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1279 err: 1280 return 0; 1281 } 1282 1283 int 1284 ssl3_get_server_key_exchange(SSL *s) 1285 { 1286 CBS cbs, signature; 1287 EVP_MD_CTX *md_ctx; 1288 const unsigned char *param; 1289 size_t param_len; 1290 long alg_k, alg_a; 1291 int al, ret; 1292 1293 alg_k = s->s3->hs.cipher->algorithm_mkey; 1294 alg_a = s->s3->hs.cipher->algorithm_auth; 1295 1296 /* 1297 * Use same message size as in ssl3_get_certificate_request() 1298 * as ServerKeyExchange message may be skipped. 1299 */ 1300 if ((ret = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1301 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list)) <= 0) 1302 return ret; 1303 1304 if ((md_ctx = EVP_MD_CTX_new()) == NULL) 1305 goto err; 1306 1307 if (s->internal->init_num < 0) 1308 goto err; 1309 1310 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 1311 1312 if (s->s3->hs.tls12.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1313 /* 1314 * Do not skip server key exchange if this cipher suite uses 1315 * ephemeral keys. 1316 */ 1317 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1318 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1319 al = SSL_AD_UNEXPECTED_MESSAGE; 1320 goto fatal_err; 1321 } 1322 1323 s->s3->hs.tls12.reuse_message = 1; 1324 EVP_MD_CTX_free(md_ctx); 1325 return (1); 1326 } 1327 1328 param = CBS_data(&cbs); 1329 param_len = CBS_len(&cbs); 1330 1331 if (alg_k & SSL_kDHE) { 1332 if (!ssl3_get_server_kex_dhe(s, &cbs)) 1333 goto err; 1334 } else if (alg_k & SSL_kECDHE) { 1335 if (!ssl3_get_server_kex_ecdhe(s, &cbs)) 1336 goto err; 1337 } else if (alg_k != 0) { 1338 al = SSL_AD_UNEXPECTED_MESSAGE; 1339 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1340 goto fatal_err; 1341 } 1342 1343 param_len -= CBS_len(&cbs); 1344 1345 /* if it was signed, check the signature */ 1346 if ((alg_a & SSL_aNULL) == 0) { 1347 uint16_t sigalg_value = SIGALG_NONE; 1348 const struct ssl_sigalg *sigalg; 1349 EVP_PKEY_CTX *pctx; 1350 EVP_PKEY *pkey = NULL; 1351 1352 if ((alg_a & SSL_aRSA) != 0 && 1353 s->session->peer_cert_type == SSL_PKEY_RSA) { 1354 pkey = X509_get0_pubkey(s->session->peer_cert); 1355 } else if ((alg_a & SSL_aECDSA) != 0 && 1356 s->session->peer_cert_type == SSL_PKEY_ECC) { 1357 pkey = X509_get0_pubkey(s->session->peer_cert); 1358 } 1359 if (pkey == NULL) { 1360 al = SSL_AD_ILLEGAL_PARAMETER; 1361 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1362 goto fatal_err; 1363 } 1364 1365 if (SSL_USE_SIGALGS(s)) { 1366 if (!CBS_get_u16(&cbs, &sigalg_value)) 1367 goto decode_err; 1368 } 1369 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1370 goto decode_err; 1371 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1372 al = SSL_AD_DECODE_ERROR; 1373 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1374 goto fatal_err; 1375 } 1376 1377 if ((sigalg = ssl_sigalg_for_peer(s, pkey, 1378 sigalg_value)) == NULL) { 1379 al = SSL_AD_DECODE_ERROR; 1380 goto fatal_err; 1381 } 1382 s->s3->hs.peer_sigalg = sigalg; 1383 1384 if (!EVP_DigestVerifyInit(md_ctx, &pctx, sigalg->md(), 1385 NULL, pkey)) 1386 goto err; 1387 if (!EVP_DigestVerifyUpdate(md_ctx, s->s3->client_random, 1388 SSL3_RANDOM_SIZE)) 1389 goto err; 1390 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1391 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1392 RSA_PKCS1_PSS_PADDING) || 1393 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1394 goto err; 1395 if (!EVP_DigestVerifyUpdate(md_ctx, s->s3->server_random, 1396 SSL3_RANDOM_SIZE)) 1397 goto err; 1398 if (!EVP_DigestVerifyUpdate(md_ctx, param, param_len)) 1399 goto err; 1400 if (EVP_DigestVerifyFinal(md_ctx, CBS_data(&signature), 1401 CBS_len(&signature)) <= 0) { 1402 al = SSL_AD_DECRYPT_ERROR; 1403 SSLerror(s, SSL_R_BAD_SIGNATURE); 1404 goto fatal_err; 1405 } 1406 } 1407 1408 if (CBS_len(&cbs) != 0) { 1409 al = SSL_AD_DECODE_ERROR; 1410 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1411 goto fatal_err; 1412 } 1413 1414 EVP_MD_CTX_free(md_ctx); 1415 1416 return (1); 1417 1418 decode_err: 1419 al = SSL_AD_DECODE_ERROR; 1420 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1421 1422 fatal_err: 1423 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1424 1425 err: 1426 EVP_MD_CTX_free(md_ctx); 1427 1428 return (-1); 1429 } 1430 1431 int 1432 ssl3_get_certificate_request(SSL *s) 1433 { 1434 CBS cert_request, cert_types, rdn_list; 1435 X509_NAME *xn = NULL; 1436 const unsigned char *q; 1437 STACK_OF(X509_NAME) *ca_sk = NULL; 1438 int ret; 1439 1440 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1441 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list)) <= 0) 1442 return ret; 1443 1444 ret = 0; 1445 1446 s->s3->hs.tls12.cert_request = 0; 1447 1448 if (s->s3->hs.tls12.message_type == SSL3_MT_SERVER_DONE) { 1449 s->s3->hs.tls12.reuse_message = 1; 1450 /* 1451 * If we get here we don't need any cached handshake records 1452 * as we wont be doing client auth. 1453 */ 1454 tls1_transcript_free(s); 1455 return (1); 1456 } 1457 1458 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1459 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1460 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1461 goto err; 1462 } 1463 1464 /* TLS does not like anon-DH with client cert */ 1465 if (s->s3->hs.cipher->algorithm_auth & SSL_aNULL) { 1466 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1467 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1468 goto err; 1469 } 1470 1471 if (s->internal->init_num < 0) 1472 goto decode_err; 1473 CBS_init(&cert_request, s->internal->init_msg, s->internal->init_num); 1474 1475 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1476 SSLerror(s, ERR_R_MALLOC_FAILURE); 1477 goto err; 1478 } 1479 1480 if (!CBS_get_u8_length_prefixed(&cert_request, &cert_types)) 1481 goto decode_err; 1482 1483 if (SSL_USE_SIGALGS(s)) { 1484 CBS sigalgs; 1485 1486 if (CBS_len(&cert_request) < 2) { 1487 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1488 goto err; 1489 } 1490 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1491 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1492 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1493 goto err; 1494 } 1495 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1496 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1497 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1498 goto err; 1499 } 1500 if (!CBS_stow(&sigalgs, &s->s3->hs.sigalgs, 1501 &s->s3->hs.sigalgs_len)) 1502 goto err; 1503 } 1504 1505 /* get the CA RDNs */ 1506 if (CBS_len(&cert_request) < 2) { 1507 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1508 goto err; 1509 } 1510 1511 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1512 CBS_len(&cert_request) != 0) { 1513 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1514 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1515 goto err; 1516 } 1517 1518 while (CBS_len(&rdn_list) > 0) { 1519 CBS rdn; 1520 1521 if (CBS_len(&rdn_list) < 2) { 1522 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1523 goto err; 1524 } 1525 1526 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1527 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1528 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1529 goto err; 1530 } 1531 1532 q = CBS_data(&rdn); 1533 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1534 ssl3_send_alert(s, SSL3_AL_FATAL, 1535 SSL_AD_DECODE_ERROR); 1536 SSLerror(s, ERR_R_ASN1_LIB); 1537 goto err; 1538 } 1539 1540 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1541 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1542 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1543 goto err; 1544 } 1545 if (!sk_X509_NAME_push(ca_sk, xn)) { 1546 SSLerror(s, ERR_R_MALLOC_FAILURE); 1547 goto err; 1548 } 1549 xn = NULL; /* avoid free in err block */ 1550 } 1551 1552 /* we should setup a certificate to return.... */ 1553 s->s3->hs.tls12.cert_request = 1; 1554 sk_X509_NAME_pop_free(s->s3->hs.tls12.ca_names, X509_NAME_free); 1555 s->s3->hs.tls12.ca_names = ca_sk; 1556 ca_sk = NULL; 1557 1558 ret = 1; 1559 if (0) { 1560 decode_err: 1561 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1562 } 1563 err: 1564 X509_NAME_free(xn); 1565 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1566 return (ret); 1567 } 1568 1569 static int 1570 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1571 { 1572 return (X509_NAME_cmp(*a, *b)); 1573 } 1574 1575 int 1576 ssl3_get_new_session_ticket(SSL *s) 1577 { 1578 uint32_t lifetime_hint; 1579 CBS cbs, session_ticket; 1580 unsigned int session_id_length = 0; 1581 int al, ret; 1582 1583 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1584 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384)) <= 0) 1585 return ret; 1586 1587 if (s->s3->hs.tls12.message_type == SSL3_MT_FINISHED) { 1588 s->s3->hs.tls12.reuse_message = 1; 1589 return (1); 1590 } 1591 if (s->s3->hs.tls12.message_type != SSL3_MT_NEWSESSION_TICKET) { 1592 al = SSL_AD_UNEXPECTED_MESSAGE; 1593 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1594 goto fatal_err; 1595 } 1596 1597 if (s->internal->init_num < 0) { 1598 al = SSL_AD_DECODE_ERROR; 1599 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1600 goto fatal_err; 1601 } 1602 1603 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 1604 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1605 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1606 CBS_len(&cbs) != 0) { 1607 al = SSL_AD_DECODE_ERROR; 1608 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1609 goto fatal_err; 1610 } 1611 s->session->tlsext_tick_lifetime_hint = lifetime_hint; 1612 1613 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1614 &s->session->tlsext_ticklen)) { 1615 SSLerror(s, ERR_R_MALLOC_FAILURE); 1616 goto err; 1617 } 1618 1619 /* 1620 * There are two ways to detect a resumed ticket sesion. 1621 * One is to set an appropriate session ID and then the server 1622 * must return a match in ServerHello. This allows the normal 1623 * client session ID matching to work and we know much 1624 * earlier that the ticket has been accepted. 1625 * 1626 * The other way is to set zero length session ID when the 1627 * ticket is presented and rely on the handshake to determine 1628 * session resumption. 1629 * 1630 * We choose the former approach because this fits in with 1631 * assumptions elsewhere in OpenSSL. The session ID is set 1632 * to the SHA256 hash of the ticket. 1633 */ 1634 if (!EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1635 s->session->session_id, &session_id_length, EVP_sha256(), NULL)) { 1636 al = SSL_AD_INTERNAL_ERROR; 1637 SSLerror(s, ERR_R_EVP_LIB); 1638 goto fatal_err; 1639 } 1640 s->session->session_id_length = session_id_length; 1641 1642 return (1); 1643 1644 fatal_err: 1645 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1646 err: 1647 return (-1); 1648 } 1649 1650 int 1651 ssl3_get_cert_status(SSL *s) 1652 { 1653 CBS cert_status, response; 1654 uint8_t status_type; 1655 int al, ret; 1656 1657 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1658 SSL3_ST_CR_CERT_STATUS_B, -1, 16384)) <= 0) 1659 return ret; 1660 1661 if (s->s3->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1662 /* 1663 * Tell the callback the server did not send us an OSCP 1664 * response, and has decided to head directly to key exchange. 1665 */ 1666 if (s->ctx->internal->tlsext_status_cb) { 1667 free(s->internal->tlsext_ocsp_resp); 1668 s->internal->tlsext_ocsp_resp = NULL; 1669 s->internal->tlsext_ocsp_resp_len = 0; 1670 1671 ret = s->ctx->internal->tlsext_status_cb(s, 1672 s->ctx->internal->tlsext_status_arg); 1673 if (ret == 0) { 1674 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1675 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1676 goto fatal_err; 1677 } 1678 if (ret < 0) { 1679 al = SSL_AD_INTERNAL_ERROR; 1680 SSLerror(s, ERR_R_MALLOC_FAILURE); 1681 goto fatal_err; 1682 } 1683 } 1684 s->s3->hs.tls12.reuse_message = 1; 1685 return (1); 1686 } 1687 1688 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE && 1689 s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE_STATUS) { 1690 al = SSL_AD_UNEXPECTED_MESSAGE; 1691 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1692 goto fatal_err; 1693 } 1694 1695 if (s->internal->init_num < 0) { 1696 /* need at least status type + length */ 1697 al = SSL_AD_DECODE_ERROR; 1698 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1699 goto fatal_err; 1700 } 1701 1702 CBS_init(&cert_status, s->internal->init_msg, s->internal->init_num); 1703 if (!CBS_get_u8(&cert_status, &status_type) || 1704 CBS_len(&cert_status) < 3) { 1705 /* need at least status type + length */ 1706 al = SSL_AD_DECODE_ERROR; 1707 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1708 goto fatal_err; 1709 } 1710 1711 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1712 al = SSL_AD_DECODE_ERROR; 1713 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1714 goto fatal_err; 1715 } 1716 1717 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1718 CBS_len(&cert_status) != 0) { 1719 al = SSL_AD_DECODE_ERROR; 1720 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1721 goto fatal_err; 1722 } 1723 1724 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1725 &s->internal->tlsext_ocsp_resp_len)) { 1726 al = SSL_AD_INTERNAL_ERROR; 1727 SSLerror(s, ERR_R_MALLOC_FAILURE); 1728 goto fatal_err; 1729 } 1730 1731 if (s->ctx->internal->tlsext_status_cb) { 1732 ret = s->ctx->internal->tlsext_status_cb(s, 1733 s->ctx->internal->tlsext_status_arg); 1734 if (ret == 0) { 1735 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1736 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1737 goto fatal_err; 1738 } 1739 if (ret < 0) { 1740 al = SSL_AD_INTERNAL_ERROR; 1741 SSLerror(s, ERR_R_MALLOC_FAILURE); 1742 goto fatal_err; 1743 } 1744 } 1745 return (1); 1746 fatal_err: 1747 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1748 return (-1); 1749 } 1750 1751 int 1752 ssl3_get_server_done(SSL *s) 1753 { 1754 int ret; 1755 1756 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1757 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1758 30 /* should be very small, like 0 :-) */)) <= 0) 1759 return ret; 1760 1761 if (s->internal->init_num != 0) { 1762 /* should contain no data */ 1763 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1764 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1765 return -1; 1766 } 1767 1768 return 1; 1769 } 1770 1771 static int 1772 ssl3_send_client_kex_rsa(SSL *s, CBB *cbb) 1773 { 1774 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1775 unsigned char *enc_pms = NULL; 1776 uint16_t max_legacy_version; 1777 EVP_PKEY *pkey; 1778 RSA *rsa; 1779 int ret = 0; 1780 int enc_len; 1781 CBB epms; 1782 1783 /* 1784 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1785 */ 1786 1787 pkey = X509_get0_pubkey(s->session->peer_cert); 1788 if (pkey == NULL || (rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) { 1789 SSLerror(s, ERR_R_INTERNAL_ERROR); 1790 goto err; 1791 } 1792 1793 /* 1794 * Our maximum legacy protocol version - while RFC 5246 section 7.4.7.1 1795 * says "The latest (newest) version supported by the client", if we're 1796 * doing RSA key exchange then we have to presume that we're talking to 1797 * a server that does not understand the supported versions extension 1798 * and therefore our maximum version is that sent in the ClientHello. 1799 */ 1800 if (!ssl_max_legacy_version(s, &max_legacy_version)) 1801 goto err; 1802 pms[0] = max_legacy_version >> 8; 1803 pms[1] = max_legacy_version & 0xff; 1804 arc4random_buf(&pms[2], sizeof(pms) - 2); 1805 1806 if ((enc_pms = malloc(RSA_size(rsa))) == NULL) { 1807 SSLerror(s, ERR_R_MALLOC_FAILURE); 1808 goto err; 1809 } 1810 1811 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, rsa, 1812 RSA_PKCS1_PADDING); 1813 if (enc_len <= 0) { 1814 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1815 goto err; 1816 } 1817 1818 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1819 goto err; 1820 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 1821 goto err; 1822 if (!CBB_flush(cbb)) 1823 goto err; 1824 1825 if (!tls12_derive_master_secret(s, pms, sizeof(pms))) 1826 goto err; 1827 1828 ret = 1; 1829 1830 err: 1831 explicit_bzero(pms, sizeof(pms)); 1832 free(enc_pms); 1833 1834 return ret; 1835 } 1836 1837 static int 1838 ssl3_send_client_kex_dhe(SSL *s, CBB *cbb) 1839 { 1840 uint8_t *key = NULL; 1841 size_t key_len = 0; 1842 int ret = 0; 1843 1844 /* Ensure that we have an ephemeral key from the server for DHE. */ 1845 if (s->s3->hs.key_share == NULL) { 1846 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1847 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1848 goto err; 1849 } 1850 1851 if (!tls_key_share_generate(s->s3->hs.key_share)) 1852 goto err; 1853 if (!tls_key_share_public(s->s3->hs.key_share, cbb)) 1854 goto err; 1855 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len)) 1856 goto err; 1857 1858 if (!tls_key_share_peer_security(s, s->s3->hs.key_share)) { 1859 SSLerror(s, SSL_R_DH_KEY_TOO_SMALL); 1860 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1861 return 0; 1862 } 1863 1864 if (!tls12_derive_master_secret(s, key, key_len)) 1865 goto err; 1866 1867 ret = 1; 1868 1869 err: 1870 freezero(key, key_len); 1871 1872 return ret; 1873 } 1874 1875 static int 1876 ssl3_send_client_kex_ecdhe(SSL *s, CBB *cbb) 1877 { 1878 uint8_t *key = NULL; 1879 size_t key_len = 0; 1880 CBB public; 1881 int ret = 0; 1882 1883 /* Ensure that we have an ephemeral key for ECDHE. */ 1884 if (s->s3->hs.key_share == NULL) { 1885 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1886 SSLerror(s, ERR_R_INTERNAL_ERROR); 1887 goto err; 1888 } 1889 1890 if (!tls_key_share_generate(s->s3->hs.key_share)) 1891 goto err; 1892 1893 if (!CBB_add_u8_length_prefixed(cbb, &public)) 1894 return 0; 1895 if (!tls_key_share_public(s->s3->hs.key_share, &public)) 1896 goto err; 1897 if (!CBB_flush(cbb)) 1898 goto err; 1899 1900 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len)) 1901 goto err; 1902 1903 if (!tls12_derive_master_secret(s, key, key_len)) 1904 goto err; 1905 1906 ret = 1; 1907 1908 err: 1909 freezero(key, key_len); 1910 1911 return ret; 1912 } 1913 1914 static int 1915 ssl3_send_client_kex_gost(SSL *s, CBB *cbb) 1916 { 1917 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 1918 EVP_PKEY_CTX *pkey_ctx = NULL; 1919 EVP_MD_CTX *ukm_hash = NULL; 1920 EVP_PKEY *pkey; 1921 size_t msglen; 1922 unsigned int md_len; 1923 CBB gostblob; 1924 int nid; 1925 int ret = 0; 1926 1927 /* Get server sertificate PKEY and create ctx from it */ 1928 pkey = X509_get0_pubkey(s->session->peer_cert); 1929 if (pkey == NULL || s->session->peer_cert_type != SSL_PKEY_GOST01) { 1930 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 1931 goto err; 1932 } 1933 if ((pkey_ctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) { 1934 SSLerror(s, ERR_R_MALLOC_FAILURE); 1935 goto err; 1936 } 1937 1938 /* 1939 * If we have send a certificate, and certificate key parameters match 1940 * those of server certificate, use certificate key for key exchange. 1941 * Otherwise, generate ephemeral key pair. 1942 */ 1943 if (EVP_PKEY_encrypt_init(pkey_ctx) <= 0) 1944 goto err; 1945 1946 /* Generate session key. */ 1947 arc4random_buf(premaster_secret, sizeof(premaster_secret)); 1948 1949 /* 1950 * If we have client certificate, use its secret as peer key. 1951 * XXX - this presumably lacks PFS. 1952 */ 1953 if (s->s3->hs.tls12.cert_request != 0 && 1954 s->cert->key->privatekey != NULL) { 1955 if (EVP_PKEY_derive_set_peer(pkey_ctx, 1956 s->cert->key->privatekey) <=0) { 1957 /* 1958 * If there was an error - just ignore it. 1959 * Ephemeral key would be used. 1960 */ 1961 ERR_clear_error(); 1962 } 1963 } 1964 1965 /* 1966 * Compute shared IV and store it in algorithm-specific context data. 1967 */ 1968 if ((ukm_hash = EVP_MD_CTX_new()) == NULL) { 1969 SSLerror(s, ERR_R_MALLOC_FAILURE); 1970 goto err; 1971 } 1972 1973 /* XXX check handshake hash instead. */ 1974 if (s->s3->hs.cipher->algorithm2 & SSL_HANDSHAKE_MAC_GOST94) 1975 nid = NID_id_GostR3411_94; 1976 else 1977 nid = NID_id_tc26_gost3411_2012_256; 1978 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 1979 goto err; 1980 if (!EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE)) 1981 goto err; 1982 if (!EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE)) 1983 goto err; 1984 if (!EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len)) 1985 goto err; 1986 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 1987 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 1988 SSLerror(s, SSL_R_LIBRARY_BUG); 1989 goto err; 1990 } 1991 1992 /* 1993 * Make GOST keytransport blob message, encapsulate it into sequence. 1994 */ 1995 msglen = 255; 1996 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 1997 sizeof(premaster_secret)) < 0) { 1998 SSLerror(s, SSL_R_LIBRARY_BUG); 1999 goto err; 2000 } 2001 2002 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2003 goto err; 2004 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2005 goto err; 2006 if (!CBB_flush(cbb)) 2007 goto err; 2008 2009 /* Check if pubkey from client certificate was used. */ 2010 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2011 NULL) > 0) 2012 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2013 2014 if (!tls12_derive_master_secret(s, premaster_secret, 32)) 2015 goto err; 2016 2017 ret = 1; 2018 2019 err: 2020 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2021 EVP_PKEY_CTX_free(pkey_ctx); 2022 EVP_MD_CTX_free(ukm_hash); 2023 2024 return ret; 2025 } 2026 2027 int 2028 ssl3_send_client_key_exchange(SSL *s) 2029 { 2030 unsigned long alg_k; 2031 CBB cbb, kex; 2032 2033 memset(&cbb, 0, sizeof(cbb)); 2034 2035 if (s->s3->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2036 alg_k = s->s3->hs.cipher->algorithm_mkey; 2037 2038 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2039 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2040 goto err; 2041 2042 if (alg_k & SSL_kRSA) { 2043 if (!ssl3_send_client_kex_rsa(s, &kex)) 2044 goto err; 2045 } else if (alg_k & SSL_kDHE) { 2046 if (!ssl3_send_client_kex_dhe(s, &kex)) 2047 goto err; 2048 } else if (alg_k & SSL_kECDHE) { 2049 if (!ssl3_send_client_kex_ecdhe(s, &kex)) 2050 goto err; 2051 } else if (alg_k & SSL_kGOST) { 2052 if (!ssl3_send_client_kex_gost(s, &kex)) 2053 goto err; 2054 } else { 2055 ssl3_send_alert(s, SSL3_AL_FATAL, 2056 SSL_AD_HANDSHAKE_FAILURE); 2057 SSLerror(s, ERR_R_INTERNAL_ERROR); 2058 goto err; 2059 } 2060 2061 if (!ssl3_handshake_msg_finish(s, &cbb)) 2062 goto err; 2063 2064 s->s3->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2065 } 2066 2067 /* SSL3_ST_CW_KEY_EXCH_B */ 2068 return (ssl3_handshake_write(s)); 2069 2070 err: 2071 CBB_cleanup(&cbb); 2072 2073 return (-1); 2074 } 2075 2076 static int 2077 ssl3_send_client_verify_sigalgs(SSL *s, EVP_PKEY *pkey, 2078 const struct ssl_sigalg *sigalg, CBB *cert_verify) 2079 { 2080 CBB cbb_signature; 2081 EVP_PKEY_CTX *pctx = NULL; 2082 EVP_MD_CTX *mctx = NULL; 2083 const unsigned char *hdata; 2084 unsigned char *signature = NULL; 2085 size_t signature_len, hdata_len; 2086 int ret = 0; 2087 2088 if ((mctx = EVP_MD_CTX_new()) == NULL) 2089 goto err; 2090 2091 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2092 SSLerror(s, ERR_R_INTERNAL_ERROR); 2093 goto err; 2094 } 2095 if (!EVP_DigestSignInit(mctx, &pctx, sigalg->md(), NULL, pkey)) { 2096 SSLerror(s, ERR_R_EVP_LIB); 2097 goto err; 2098 } 2099 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2100 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2101 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2102 SSLerror(s, ERR_R_EVP_LIB); 2103 goto err; 2104 } 2105 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2106 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2107 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2108 SSLerror(s, ERR_R_EVP_LIB); 2109 goto err; 2110 } 2111 if (!EVP_DigestSignUpdate(mctx, hdata, hdata_len)) { 2112 SSLerror(s, ERR_R_EVP_LIB); 2113 goto err; 2114 } 2115 if (!EVP_DigestSignFinal(mctx, NULL, &signature_len) || 2116 signature_len == 0) { 2117 SSLerror(s, ERR_R_EVP_LIB); 2118 goto err; 2119 } 2120 if ((signature = calloc(1, signature_len)) == NULL) { 2121 SSLerror(s, ERR_R_MALLOC_FAILURE); 2122 goto err; 2123 } 2124 if (!EVP_DigestSignFinal(mctx, signature, &signature_len)) { 2125 SSLerror(s, ERR_R_EVP_LIB); 2126 goto err; 2127 } 2128 2129 if (!CBB_add_u16(cert_verify, sigalg->value)) 2130 goto err; 2131 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2132 goto err; 2133 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2134 goto err; 2135 if (!CBB_flush(cert_verify)) 2136 goto err; 2137 2138 ret = 1; 2139 2140 err: 2141 EVP_MD_CTX_free(mctx); 2142 free(signature); 2143 return ret; 2144 } 2145 2146 static int 2147 ssl3_send_client_verify_rsa(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2148 { 2149 CBB cbb_signature; 2150 RSA *rsa; 2151 unsigned char data[EVP_MAX_MD_SIZE]; 2152 unsigned char *signature = NULL; 2153 unsigned int signature_len; 2154 size_t data_len; 2155 int ret = 0; 2156 2157 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2158 goto err; 2159 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2160 goto err; 2161 if ((rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) 2162 goto err; 2163 if (RSA_sign(NID_md5_sha1, data, data_len, signature, &signature_len, 2164 rsa) <= 0 ) { 2165 SSLerror(s, ERR_R_RSA_LIB); 2166 goto err; 2167 } 2168 2169 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2170 goto err; 2171 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2172 goto err; 2173 if (!CBB_flush(cert_verify)) 2174 goto err; 2175 2176 ret = 1; 2177 err: 2178 free(signature); 2179 return ret; 2180 } 2181 2182 static int 2183 ssl3_send_client_verify_ec(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2184 { 2185 CBB cbb_signature; 2186 EC_KEY *eckey; 2187 unsigned char data[EVP_MAX_MD_SIZE]; 2188 unsigned char *signature = NULL; 2189 unsigned int signature_len; 2190 int ret = 0; 2191 2192 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2193 goto err; 2194 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2195 goto err; 2196 if ((eckey = EVP_PKEY_get0_EC_KEY(pkey)) == NULL) 2197 goto err; 2198 if (!ECDSA_sign(0, &data[MD5_DIGEST_LENGTH], SHA_DIGEST_LENGTH, 2199 signature, &signature_len, eckey)) { 2200 SSLerror(s, ERR_R_ECDSA_LIB); 2201 goto err; 2202 } 2203 2204 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2205 goto err; 2206 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2207 goto err; 2208 if (!CBB_flush(cert_verify)) 2209 goto err; 2210 2211 ret = 1; 2212 err: 2213 free(signature); 2214 return ret; 2215 } 2216 2217 #ifndef OPENSSL_NO_GOST 2218 static int 2219 ssl3_send_client_verify_gost(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2220 { 2221 CBB cbb_signature; 2222 EVP_MD_CTX *mctx; 2223 EVP_PKEY_CTX *pctx; 2224 const EVP_MD *md; 2225 const unsigned char *hdata; 2226 unsigned char *signature = NULL; 2227 size_t signature_len; 2228 size_t hdata_len; 2229 int nid; 2230 int ret = 0; 2231 2232 if ((mctx = EVP_MD_CTX_new()) == NULL) 2233 goto err; 2234 2235 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2236 SSLerror(s, ERR_R_INTERNAL_ERROR); 2237 goto err; 2238 } 2239 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2240 (md = EVP_get_digestbynid(nid)) == NULL) { 2241 SSLerror(s, ERR_R_EVP_LIB); 2242 goto err; 2243 } 2244 if (!EVP_DigestSignInit(mctx, &pctx, md, NULL, pkey)) { 2245 SSLerror(s, ERR_R_EVP_LIB); 2246 goto err; 2247 } 2248 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2249 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2250 SSLerror(s, ERR_R_EVP_LIB); 2251 goto err; 2252 } 2253 if (!EVP_DigestSignUpdate(mctx, hdata, hdata_len)) { 2254 SSLerror(s, ERR_R_EVP_LIB); 2255 goto err; 2256 } 2257 if (!EVP_DigestSignFinal(mctx, NULL, &signature_len) || 2258 signature_len == 0) { 2259 SSLerror(s, ERR_R_EVP_LIB); 2260 goto err; 2261 } 2262 if ((signature = calloc(1, signature_len)) == NULL) { 2263 SSLerror(s, ERR_R_MALLOC_FAILURE); 2264 goto err; 2265 } 2266 if (!EVP_DigestSignFinal(mctx, signature, &signature_len)) { 2267 SSLerror(s, ERR_R_EVP_LIB); 2268 goto err; 2269 } 2270 2271 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2272 goto err; 2273 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2274 goto err; 2275 if (!CBB_flush(cert_verify)) 2276 goto err; 2277 2278 ret = 1; 2279 err: 2280 EVP_MD_CTX_free(mctx); 2281 free(signature); 2282 return ret; 2283 } 2284 #endif 2285 2286 int 2287 ssl3_send_client_verify(SSL *s) 2288 { 2289 const struct ssl_sigalg *sigalg; 2290 CBB cbb, cert_verify; 2291 EVP_PKEY *pkey; 2292 2293 memset(&cbb, 0, sizeof(cbb)); 2294 2295 if (s->s3->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2296 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2297 SSL3_MT_CERTIFICATE_VERIFY)) 2298 goto err; 2299 2300 pkey = s->cert->key->privatekey; 2301 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2302 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2303 goto err; 2304 } 2305 s->s3->hs.our_sigalg = sigalg; 2306 2307 /* 2308 * For TLS v1.2 send signature algorithm and signature using 2309 * agreed digest and cached handshake records. 2310 */ 2311 if (SSL_USE_SIGALGS(s)) { 2312 if (!ssl3_send_client_verify_sigalgs(s, pkey, sigalg, 2313 &cert_verify)) 2314 goto err; 2315 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_RSA) { 2316 if (!ssl3_send_client_verify_rsa(s, pkey, &cert_verify)) 2317 goto err; 2318 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) { 2319 if (!ssl3_send_client_verify_ec(s, pkey, &cert_verify)) 2320 goto err; 2321 #ifndef OPENSSL_NO_GOST 2322 } else if (EVP_PKEY_id(pkey) == NID_id_GostR3410_94 || 2323 EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) { 2324 if (!ssl3_send_client_verify_gost(s, pkey, &cert_verify)) 2325 goto err; 2326 #endif 2327 } else { 2328 SSLerror(s, ERR_R_INTERNAL_ERROR); 2329 goto err; 2330 } 2331 2332 tls1_transcript_free(s); 2333 2334 if (!ssl3_handshake_msg_finish(s, &cbb)) 2335 goto err; 2336 2337 s->s3->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2338 } 2339 2340 return (ssl3_handshake_write(s)); 2341 2342 err: 2343 CBB_cleanup(&cbb); 2344 2345 return (-1); 2346 } 2347 2348 int 2349 ssl3_send_client_certificate(SSL *s) 2350 { 2351 EVP_PKEY *pkey = NULL; 2352 X509 *x509 = NULL; 2353 CBB cbb, client_cert; 2354 int i; 2355 2356 memset(&cbb, 0, sizeof(cbb)); 2357 2358 if (s->s3->hs.state == SSL3_ST_CW_CERT_A) { 2359 if (s->cert->key->x509 == NULL || 2360 s->cert->key->privatekey == NULL) 2361 s->s3->hs.state = SSL3_ST_CW_CERT_B; 2362 else 2363 s->s3->hs.state = SSL3_ST_CW_CERT_C; 2364 } 2365 2366 /* We need to get a client cert */ 2367 if (s->s3->hs.state == SSL3_ST_CW_CERT_B) { 2368 /* 2369 * If we get an error, we need to 2370 * ssl->internal->rwstate = SSL_X509_LOOKUP; return(-1); 2371 * We then get retried later. 2372 */ 2373 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2374 if (i < 0) { 2375 s->internal->rwstate = SSL_X509_LOOKUP; 2376 return (-1); 2377 } 2378 s->internal->rwstate = SSL_NOTHING; 2379 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2380 s->s3->hs.state = SSL3_ST_CW_CERT_B; 2381 if (!SSL_use_certificate(s, x509) || 2382 !SSL_use_PrivateKey(s, pkey)) 2383 i = 0; 2384 } else if (i == 1) { 2385 i = 0; 2386 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2387 } 2388 2389 X509_free(x509); 2390 EVP_PKEY_free(pkey); 2391 if (i == 0) { 2392 s->s3->hs.tls12.cert_request = 2; 2393 2394 /* There is no client certificate to verify. */ 2395 tls1_transcript_free(s); 2396 } 2397 2398 /* Ok, we have a cert */ 2399 s->s3->hs.state = SSL3_ST_CW_CERT_C; 2400 } 2401 2402 if (s->s3->hs.state == SSL3_ST_CW_CERT_C) { 2403 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2404 SSL3_MT_CERTIFICATE)) 2405 goto err; 2406 if (!ssl3_output_cert_chain(s, &client_cert, 2407 (s->s3->hs.tls12.cert_request == 2) ? NULL : s->cert->key)) 2408 goto err; 2409 if (!ssl3_handshake_msg_finish(s, &cbb)) 2410 goto err; 2411 2412 s->s3->hs.state = SSL3_ST_CW_CERT_D; 2413 } 2414 2415 /* SSL3_ST_CW_CERT_D */ 2416 return (ssl3_handshake_write(s)); 2417 2418 err: 2419 CBB_cleanup(&cbb); 2420 2421 return (0); 2422 } 2423 2424 #define has_bits(i,m) (((i)&(m)) == (m)) 2425 2426 int 2427 ssl3_check_cert_and_algorithm(SSL *s) 2428 { 2429 long alg_k, alg_a; 2430 int nid = NID_undef; 2431 int i; 2432 2433 alg_k = s->s3->hs.cipher->algorithm_mkey; 2434 alg_a = s->s3->hs.cipher->algorithm_auth; 2435 2436 /* We don't have a certificate. */ 2437 if (alg_a & SSL_aNULL) 2438 return (1); 2439 2440 if (s->s3->hs.key_share != NULL) 2441 nid = tls_key_share_nid(s->s3->hs.key_share); 2442 2443 /* This is the passed certificate. */ 2444 2445 if (s->session->peer_cert_type == SSL_PKEY_ECC) { 2446 if (!ssl_check_srvr_ecc_cert_and_alg(s, s->session->peer_cert)) { 2447 SSLerror(s, SSL_R_BAD_ECC_CERT); 2448 goto fatal_err; 2449 } 2450 return (1); 2451 } 2452 2453 i = X509_certificate_type(s->session->peer_cert, NULL); 2454 2455 /* Check that we have a certificate if we require one. */ 2456 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2457 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2458 goto fatal_err; 2459 } 2460 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2461 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2462 goto fatal_err; 2463 } 2464 if ((alg_k & SSL_kDHE) && 2465 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (nid == NID_dhKeyAgreement))) { 2466 SSLerror(s, SSL_R_MISSING_DH_KEY); 2467 goto fatal_err; 2468 } 2469 2470 return (1); 2471 2472 fatal_err: 2473 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2474 2475 return (0); 2476 } 2477 2478 /* 2479 * Check to see if handshake is full or resumed. Usually this is just a 2480 * case of checking to see if a cache hit has occurred. In the case of 2481 * session tickets we have to check the next message to be sure. 2482 */ 2483 2484 int 2485 ssl3_check_finished(SSL *s) 2486 { 2487 int ret; 2488 2489 /* If we have no ticket it cannot be a resumed session. */ 2490 if (!s->session->tlsext_tick) 2491 return (1); 2492 /* this function is called when we really expect a Certificate 2493 * message, so permit appropriate message length */ 2494 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2495 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list)) <= 0) 2496 return ret; 2497 2498 s->s3->hs.tls12.reuse_message = 1; 2499 if ((s->s3->hs.tls12.message_type == SSL3_MT_FINISHED) || 2500 (s->s3->hs.tls12.message_type == SSL3_MT_NEWSESSION_TICKET)) 2501 return (2); 2502 2503 return (1); 2504 } 2505 2506 int 2507 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2508 { 2509 int i = 0; 2510 2511 #ifndef OPENSSL_NO_ENGINE 2512 if (s->ctx->internal->client_cert_engine) { 2513 i = ENGINE_load_ssl_client_cert( 2514 s->ctx->internal->client_cert_engine, s, 2515 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2516 if (i != 0) 2517 return (i); 2518 } 2519 #endif 2520 if (s->ctx->internal->client_cert_cb) 2521 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2522 return (i); 2523 } 2524