1 /* $OpenBSD: ssl_clnt.c,v 1.108 2021/08/30 19:25:43 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 long n; 783 int al, ok = 0; 784 size_t cookie_len; 785 uint16_t ssl_version; 786 CBS hello_verify_request, cookie; 787 788 n = ssl3_get_message(s, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 789 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, s->internal->max_cert_list, &ok); 790 if (!ok) 791 return ((int)n); 792 793 if (S3I(s)->hs.tls12.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 794 D1I(s)->send_cookie = 0; 795 S3I(s)->hs.tls12.reuse_message = 1; 796 return (1); 797 } 798 799 if (n < 0) 800 goto decode_err; 801 802 CBS_init(&hello_verify_request, s->internal->init_msg, n); 803 804 if (!CBS_get_u16(&hello_verify_request, &ssl_version)) 805 goto decode_err; 806 if (!CBS_get_u8_length_prefixed(&hello_verify_request, &cookie)) 807 goto decode_err; 808 if (CBS_len(&hello_verify_request) != 0) 809 goto decode_err; 810 811 /* 812 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should always 813 * contain DTLSv1.0 the version that is going to be negotiated. 814 * Tolerate DTLSv1.2 just in case. 815 */ 816 if (ssl_version != DTLS1_VERSION && ssl_version != DTLS1_2_VERSION) { 817 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 818 s->version = (s->version & 0xff00) | (ssl_version & 0xff); 819 al = SSL_AD_PROTOCOL_VERSION; 820 goto fatal_err; 821 } 822 823 if (!CBS_write_bytes(&cookie, D1I(s)->cookie, 824 sizeof(D1I(s)->cookie), &cookie_len)) { 825 D1I(s)->cookie_len = 0; 826 al = SSL_AD_ILLEGAL_PARAMETER; 827 goto fatal_err; 828 } 829 D1I(s)->cookie_len = cookie_len; 830 D1I(s)->send_cookie = 1; 831 832 return 1; 833 834 decode_err: 835 al = SSL_AD_DECODE_ERROR; 836 fatal_err: 837 ssl3_send_alert(s, SSL3_AL_FATAL, al); 838 return -1; 839 } 840 841 int 842 ssl3_get_server_hello(SSL *s) 843 { 844 CBS cbs, server_random, session_id; 845 uint16_t server_version, cipher_suite; 846 uint8_t compression_method; 847 const SSL_CIPHER *cipher; 848 const SSL_METHOD *method; 849 unsigned long alg_k; 850 size_t outlen; 851 int al, ok; 852 long n; 853 854 s->internal->first_packet = 1; 855 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 856 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, /* ?? */ &ok); 857 if (!ok) 858 return ((int)n); 859 s->internal->first_packet = 0; 860 861 if (n < 0) 862 goto decode_err; 863 864 CBS_init(&cbs, s->internal->init_msg, n); 865 866 if (SSL_is_dtls(s)) { 867 if (S3I(s)->hs.tls12.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 868 if (D1I(s)->send_cookie == 0) { 869 S3I(s)->hs.tls12.reuse_message = 1; 870 return (1); 871 } else { 872 /* Already sent a cookie. */ 873 al = SSL_AD_UNEXPECTED_MESSAGE; 874 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 875 goto fatal_err; 876 } 877 } 878 } 879 880 if (S3I(s)->hs.tls12.message_type != SSL3_MT_SERVER_HELLO) { 881 al = SSL_AD_UNEXPECTED_MESSAGE; 882 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 883 goto fatal_err; 884 } 885 886 if (!CBS_get_u16(&cbs, &server_version)) 887 goto decode_err; 888 889 if (!ssl_check_version_from_server(s, server_version)) { 890 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 891 s->version = (s->version & 0xff00) | (server_version & 0xff); 892 al = SSL_AD_PROTOCOL_VERSION; 893 goto fatal_err; 894 } 895 s->version = server_version; 896 897 S3I(s)->hs.negotiated_tls_version = ssl_tls_version(server_version); 898 if (S3I(s)->hs.negotiated_tls_version == 0) { 899 SSLerror(s, ERR_R_INTERNAL_ERROR); 900 goto err; 901 } 902 903 if ((method = ssl_get_method(server_version)) == NULL) { 904 SSLerror(s, ERR_R_INTERNAL_ERROR); 905 goto err; 906 } 907 s->method = method; 908 909 /* Server random. */ 910 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 911 goto decode_err; 912 if (!CBS_write_bytes(&server_random, s->s3->server_random, 913 sizeof(s->s3->server_random), NULL)) 914 goto err; 915 916 if (S3I(s)->hs.our_max_tls_version >= TLS1_2_VERSION && 917 S3I(s)->hs.negotiated_tls_version < S3I(s)->hs.our_max_tls_version) { 918 /* 919 * RFC 8446 section 4.1.3. We must not downgrade if the server 920 * random value contains the TLS 1.2 or TLS 1.1 magical value. 921 */ 922 if (!CBS_skip(&server_random, 923 CBS_len(&server_random) - sizeof(tls13_downgrade_12))) 924 goto err; 925 if (S3I(s)->hs.negotiated_tls_version == TLS1_2_VERSION && 926 CBS_mem_equal(&server_random, tls13_downgrade_12, 927 sizeof(tls13_downgrade_12))) { 928 al = SSL_AD_ILLEGAL_PARAMETER; 929 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 930 goto fatal_err; 931 } 932 if (CBS_mem_equal(&server_random, tls13_downgrade_11, 933 sizeof(tls13_downgrade_11))) { 934 al = SSL_AD_ILLEGAL_PARAMETER; 935 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 936 goto fatal_err; 937 } 938 } 939 940 /* Session ID. */ 941 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 942 goto decode_err; 943 944 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 945 al = SSL_AD_ILLEGAL_PARAMETER; 946 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 947 goto fatal_err; 948 } 949 950 /* Cipher suite. */ 951 if (!CBS_get_u16(&cbs, &cipher_suite)) 952 goto decode_err; 953 954 /* 955 * Check if we want to resume the session based on external 956 * pre-shared secret. 957 */ 958 if (s->internal->tls_session_secret_cb) { 959 SSL_CIPHER *pref_cipher = NULL; 960 s->session->master_key_length = sizeof(s->session->master_key); 961 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 962 &s->session->master_key_length, NULL, &pref_cipher, 963 s->internal->tls_session_secret_cb_arg)) { 964 s->session->cipher = pref_cipher ? pref_cipher : 965 ssl3_get_cipher_by_value(cipher_suite); 966 s->s3->flags |= SSL3_FLAGS_CCS_OK; 967 } 968 } 969 970 if (s->session->session_id_length != 0 && 971 CBS_mem_equal(&session_id, s->session->session_id, 972 s->session->session_id_length)) { 973 if (s->sid_ctx_length != s->session->sid_ctx_length || 974 timingsafe_memcmp(s->session->sid_ctx, 975 s->sid_ctx, s->sid_ctx_length) != 0) { 976 /* actually a client application bug */ 977 al = SSL_AD_ILLEGAL_PARAMETER; 978 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 979 goto fatal_err; 980 } 981 s->s3->flags |= SSL3_FLAGS_CCS_OK; 982 s->internal->hit = 1; 983 } else { 984 /* a miss or crap from the other end */ 985 986 /* If we were trying for session-id reuse, make a new 987 * SSL_SESSION so we don't stuff up other people */ 988 s->internal->hit = 0; 989 if (s->session->session_id_length > 0) { 990 if (!ssl_get_new_session(s, 0)) { 991 al = SSL_AD_INTERNAL_ERROR; 992 goto fatal_err; 993 } 994 } 995 996 /* 997 * XXX - improve the handling for the case where there is a 998 * zero length session identifier. 999 */ 1000 if (!CBS_write_bytes(&session_id, s->session->session_id, 1001 sizeof(s->session->session_id), &outlen)) 1002 goto err; 1003 s->session->session_id_length = outlen; 1004 1005 s->session->ssl_version = s->version; 1006 } 1007 1008 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 1009 al = SSL_AD_ILLEGAL_PARAMETER; 1010 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 1011 goto fatal_err; 1012 } 1013 1014 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 1015 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 1016 S3I(s)->hs.negotiated_tls_version < TLS1_2_VERSION) { 1017 al = SSL_AD_ILLEGAL_PARAMETER; 1018 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1019 goto fatal_err; 1020 } 1021 1022 if (!ssl_cipher_in_list(SSL_get_ciphers(s), cipher)) { 1023 /* we did not say we would use this cipher */ 1024 al = SSL_AD_ILLEGAL_PARAMETER; 1025 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1026 goto fatal_err; 1027 } 1028 1029 /* 1030 * Depending on the session caching (internal/external), the cipher 1031 * and/or cipher_id values may not be set. Make sure that 1032 * cipher_id is set and use it for comparison. 1033 */ 1034 if (s->session->cipher) 1035 s->session->cipher_id = s->session->cipher->id; 1036 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 1037 al = SSL_AD_ILLEGAL_PARAMETER; 1038 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1039 goto fatal_err; 1040 } 1041 S3I(s)->hs.cipher = cipher; 1042 1043 if (!tls1_transcript_hash_init(s)) 1044 goto err; 1045 1046 /* 1047 * Don't digest cached records if no sigalgs: we may need them for 1048 * client authentication. 1049 */ 1050 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 1051 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST))) 1052 tls1_transcript_free(s); 1053 1054 if (!CBS_get_u8(&cbs, &compression_method)) 1055 goto decode_err; 1056 1057 if (compression_method != 0) { 1058 al = SSL_AD_ILLEGAL_PARAMETER; 1059 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1060 goto fatal_err; 1061 } 1062 1063 if (!tlsext_client_parse(s, SSL_TLSEXT_MSG_SH, &cbs, &al)) { 1064 SSLerror(s, SSL_R_PARSE_TLSEXT); 1065 goto fatal_err; 1066 } 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, ok, ret = -1; 1104 long n; 1105 CBS cbs, cert_list; 1106 X509 *x = NULL; 1107 const unsigned char *q; 1108 STACK_OF(X509) *sk = NULL; 1109 SESS_CERT *sc; 1110 EVP_PKEY *pkey = NULL; 1111 1112 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1113 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 1114 if (!ok) 1115 return ((int)n); 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 1129 if ((sk = sk_X509_new_null()) == NULL) { 1130 SSLerror(s, ERR_R_MALLOC_FAILURE); 1131 goto err; 1132 } 1133 1134 if (n < 0) 1135 goto decode_err; 1136 1137 CBS_init(&cbs, s->internal->init_msg, n); 1138 if (CBS_len(&cbs) < 3) 1139 goto decode_err; 1140 1141 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1142 CBS_len(&cbs) != 0) { 1143 al = SSL_AD_DECODE_ERROR; 1144 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1145 goto fatal_err; 1146 } 1147 1148 while (CBS_len(&cert_list) > 0) { 1149 CBS cert; 1150 1151 if (CBS_len(&cert_list) < 3) 1152 goto decode_err; 1153 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1154 al = SSL_AD_DECODE_ERROR; 1155 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1156 goto fatal_err; 1157 } 1158 1159 q = CBS_data(&cert); 1160 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1161 if (x == NULL) { 1162 al = SSL_AD_BAD_CERTIFICATE; 1163 SSLerror(s, ERR_R_ASN1_LIB); 1164 goto fatal_err; 1165 } 1166 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1167 al = SSL_AD_DECODE_ERROR; 1168 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1169 goto fatal_err; 1170 } 1171 if (!sk_X509_push(sk, x)) { 1172 SSLerror(s, ERR_R_MALLOC_FAILURE); 1173 goto err; 1174 } 1175 x = NULL; 1176 } 1177 1178 i = ssl_verify_cert_chain(s, sk); 1179 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1180 al = ssl_verify_alarm_type(s->verify_result); 1181 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1182 goto fatal_err; 1183 1184 } 1185 ERR_clear_error(); /* but we keep s->verify_result */ 1186 1187 sc = ssl_sess_cert_new(); 1188 if (sc == NULL) 1189 goto err; 1190 ssl_sess_cert_free(SSI(s)->sess_cert); 1191 SSI(s)->sess_cert = sc; 1192 1193 sc->cert_chain = sk; 1194 /* 1195 * Inconsistency alert: cert_chain does include the peer's 1196 * certificate, which we don't include in s3_srvr.c 1197 */ 1198 x = sk_X509_value(sk, 0); 1199 sk = NULL; 1200 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1201 1202 pkey = X509_get_pubkey(x); 1203 1204 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1205 x = NULL; 1206 al = SSL3_AL_FATAL; 1207 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1208 goto fatal_err; 1209 } 1210 1211 i = ssl_cert_type(x, pkey); 1212 if (i < 0) { 1213 x = NULL; 1214 al = SSL3_AL_FATAL; 1215 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1216 goto fatal_err; 1217 } 1218 1219 sc->peer_cert_type = i; 1220 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1221 /* 1222 * Why would the following ever happen? 1223 * We just created sc a couple of lines ago. 1224 */ 1225 X509_free(sc->peer_pkeys[i].x509); 1226 sc->peer_pkeys[i].x509 = x; 1227 sc->peer_key = &(sc->peer_pkeys[i]); 1228 1229 X509_free(s->session->peer); 1230 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1231 s->session->peer = x; 1232 s->session->verify_result = s->verify_result; 1233 1234 x = NULL; 1235 ret = 1; 1236 1237 if (0) { 1238 decode_err: 1239 /* wrong packet length */ 1240 al = SSL_AD_DECODE_ERROR; 1241 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1242 fatal_err: 1243 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1244 } 1245 err: 1246 EVP_PKEY_free(pkey); 1247 X509_free(x); 1248 sk_X509_pop_free(sk, X509_free); 1249 1250 return (ret); 1251 } 1252 1253 static int 1254 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1255 { 1256 CBS dhp, dhg, dhpk; 1257 BN_CTX *bn_ctx = NULL; 1258 SESS_CERT *sc = NULL; 1259 DH *dh = NULL; 1260 long alg_a; 1261 int al; 1262 1263 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1264 sc = SSI(s)->sess_cert; 1265 1266 if ((dh = DH_new()) == NULL) { 1267 SSLerror(s, ERR_R_DH_LIB); 1268 goto err; 1269 } 1270 1271 if (!CBS_get_u16_length_prefixed(cbs, &dhp)) 1272 goto decode_err; 1273 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1274 SSLerror(s, ERR_R_BN_LIB); 1275 goto err; 1276 } 1277 1278 if (!CBS_get_u16_length_prefixed(cbs, &dhg)) 1279 goto decode_err; 1280 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1281 SSLerror(s, ERR_R_BN_LIB); 1282 goto err; 1283 } 1284 1285 if (!CBS_get_u16_length_prefixed(cbs, &dhpk)) 1286 goto decode_err; 1287 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1288 NULL)) == NULL) { 1289 SSLerror(s, ERR_R_BN_LIB); 1290 goto err; 1291 } 1292 1293 /* 1294 * Check the strength of the DH key just constructed. 1295 * Discard keys weaker than 1024 bits. 1296 */ 1297 if (DH_size(dh) < 1024 / 8) { 1298 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1299 goto err; 1300 } 1301 1302 if (alg_a & SSL_aRSA) 1303 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1304 else 1305 /* XXX - Anonymous DH, so no certificate or pkey. */ 1306 *pkey = NULL; 1307 1308 sc->peer_dh_tmp = dh; 1309 1310 return (1); 1311 1312 decode_err: 1313 al = SSL_AD_DECODE_ERROR; 1314 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1315 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1316 1317 err: 1318 DH_free(dh); 1319 BN_CTX_free(bn_ctx); 1320 1321 return (-1); 1322 } 1323 1324 static int 1325 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1326 { 1327 EC_KEY *ecdh = NULL; 1328 int ret = -1; 1329 1330 /* Extract the server's ephemeral ECDH public key. */ 1331 if ((ecdh = EC_KEY_new()) == NULL) { 1332 SSLerror(s, ERR_R_MALLOC_FAILURE); 1333 goto err; 1334 } 1335 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh, nid, public)) { 1336 SSLerror(s, SSL_R_BAD_ECPOINT); 1337 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1338 goto err; 1339 } 1340 1341 sc->peer_nid = nid; 1342 sc->peer_ecdh_tmp = ecdh; 1343 ecdh = NULL; 1344 1345 ret = 1; 1346 1347 err: 1348 EC_KEY_free(ecdh); 1349 1350 return (ret); 1351 } 1352 1353 static int 1354 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1355 { 1356 size_t outlen; 1357 1358 if (nid != NID_X25519) { 1359 SSLerror(s, ERR_R_INTERNAL_ERROR); 1360 goto err; 1361 } 1362 1363 if (CBS_len(public) != X25519_KEY_LENGTH) { 1364 SSLerror(s, SSL_R_BAD_ECPOINT); 1365 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1366 goto err; 1367 } 1368 1369 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1370 SSLerror(s, ERR_R_MALLOC_FAILURE); 1371 goto err; 1372 } 1373 1374 return (1); 1375 1376 err: 1377 return (-1); 1378 } 1379 1380 static int 1381 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1382 { 1383 CBS public; 1384 uint8_t curve_type; 1385 uint16_t curve_id; 1386 SESS_CERT *sc; 1387 long alg_a; 1388 int nid; 1389 int al; 1390 1391 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1392 sc = SSI(s)->sess_cert; 1393 1394 /* Only named curves are supported. */ 1395 if (!CBS_get_u8(cbs, &curve_type) || 1396 curve_type != NAMED_CURVE_TYPE || 1397 !CBS_get_u16(cbs, &curve_id)) { 1398 al = SSL_AD_DECODE_ERROR; 1399 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1400 goto fatal_err; 1401 } 1402 1403 /* 1404 * Check that the curve is one of our preferences - if it is not, 1405 * the server has sent us an invalid curve. 1406 */ 1407 if (tls1_check_curve(s, curve_id) != 1) { 1408 al = SSL_AD_DECODE_ERROR; 1409 SSLerror(s, SSL_R_WRONG_CURVE); 1410 goto fatal_err; 1411 } 1412 1413 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1414 al = SSL_AD_INTERNAL_ERROR; 1415 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1416 goto fatal_err; 1417 } 1418 1419 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1420 goto decode_err; 1421 1422 if (nid == NID_X25519) { 1423 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1424 goto err; 1425 } else { 1426 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1427 goto err; 1428 } 1429 1430 /* 1431 * The ECC/TLS specification does not mention the use of DSA to sign 1432 * ECParameters in the server key exchange message. We do support RSA 1433 * and ECDSA. 1434 */ 1435 if (alg_a & SSL_aRSA) 1436 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1437 else if (alg_a & SSL_aECDSA) 1438 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1439 else 1440 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1441 *pkey = NULL; 1442 1443 return (1); 1444 1445 decode_err: 1446 al = SSL_AD_DECODE_ERROR; 1447 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1448 1449 fatal_err: 1450 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1451 1452 err: 1453 return (-1); 1454 } 1455 1456 int 1457 ssl3_get_server_key_exchange(SSL *s) 1458 { 1459 CBS cbs, signature; 1460 EVP_PKEY *pkey = NULL; 1461 EVP_MD_CTX md_ctx; 1462 const unsigned char *param; 1463 long n, alg_k, alg_a; 1464 int al, ok; 1465 size_t param_len; 1466 1467 EVP_MD_CTX_init(&md_ctx); 1468 1469 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 1470 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1471 1472 /* 1473 * Use same message size as in ssl3_get_certificate_request() 1474 * as ServerKeyExchange message may be skipped. 1475 */ 1476 n = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1477 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1478 if (!ok) 1479 return ((int)n); 1480 1481 if (n < 0) 1482 goto err; 1483 1484 CBS_init(&cbs, s->internal->init_msg, n); 1485 1486 if (S3I(s)->hs.tls12.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1487 /* 1488 * Do not skip server key exchange if this cipher suite uses 1489 * ephemeral keys. 1490 */ 1491 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1492 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1493 al = SSL_AD_UNEXPECTED_MESSAGE; 1494 goto fatal_err; 1495 } 1496 1497 S3I(s)->hs.tls12.reuse_message = 1; 1498 EVP_MD_CTX_cleanup(&md_ctx); 1499 return (1); 1500 } 1501 1502 if (SSI(s)->sess_cert != NULL) { 1503 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1504 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1505 1506 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1507 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1508 1509 free(SSI(s)->sess_cert->peer_x25519_tmp); 1510 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1511 } else { 1512 SSI(s)->sess_cert = ssl_sess_cert_new(); 1513 if (SSI(s)->sess_cert == NULL) 1514 goto err; 1515 } 1516 1517 param = CBS_data(&cbs); 1518 param_len = CBS_len(&cbs); 1519 1520 if (alg_k & SSL_kDHE) { 1521 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1) 1522 goto err; 1523 } else if (alg_k & SSL_kECDHE) { 1524 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1) 1525 goto err; 1526 } else if (alg_k != 0) { 1527 al = SSL_AD_UNEXPECTED_MESSAGE; 1528 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1529 goto fatal_err; 1530 } 1531 1532 param_len -= CBS_len(&cbs); 1533 1534 /* if it was signed, check the signature */ 1535 if (pkey != NULL) { 1536 uint16_t sigalg_value = SIGALG_NONE; 1537 const struct ssl_sigalg *sigalg; 1538 EVP_PKEY_CTX *pctx; 1539 1540 if (SSL_USE_SIGALGS(s)) { 1541 if (!CBS_get_u16(&cbs, &sigalg_value)) 1542 goto decode_err; 1543 } 1544 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1545 goto decode_err; 1546 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1547 al = SSL_AD_DECODE_ERROR; 1548 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1549 goto fatal_err; 1550 } 1551 1552 if ((sigalg = ssl_sigalg_for_peer(s, pkey, 1553 sigalg_value)) == NULL) { 1554 al = SSL_AD_DECODE_ERROR; 1555 goto fatal_err; 1556 } 1557 S3I(s)->hs.peer_sigalg = sigalg; 1558 1559 if (!EVP_DigestVerifyInit(&md_ctx, &pctx, sigalg->md(), 1560 NULL, pkey)) 1561 goto err; 1562 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->client_random, 1563 SSL3_RANDOM_SIZE)) 1564 goto err; 1565 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1566 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1567 RSA_PKCS1_PSS_PADDING) || 1568 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1569 goto err; 1570 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->server_random, 1571 SSL3_RANDOM_SIZE)) 1572 goto err; 1573 if (!EVP_DigestVerifyUpdate(&md_ctx, param, param_len)) 1574 goto err; 1575 if (EVP_DigestVerifyFinal(&md_ctx, CBS_data(&signature), 1576 CBS_len(&signature)) <= 0) { 1577 al = SSL_AD_DECRYPT_ERROR; 1578 SSLerror(s, SSL_R_BAD_SIGNATURE); 1579 goto fatal_err; 1580 } 1581 } else { 1582 /* aNULL does not need public keys. */ 1583 if (!(alg_a & SSL_aNULL)) { 1584 SSLerror(s, ERR_R_INTERNAL_ERROR); 1585 goto err; 1586 } 1587 } 1588 1589 if (CBS_len(&cbs) != 0) { 1590 al = SSL_AD_DECODE_ERROR; 1591 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1592 goto fatal_err; 1593 } 1594 1595 EVP_PKEY_free(pkey); 1596 EVP_MD_CTX_cleanup(&md_ctx); 1597 1598 return (1); 1599 1600 decode_err: 1601 al = SSL_AD_DECODE_ERROR; 1602 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1603 1604 fatal_err: 1605 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1606 1607 err: 1608 EVP_PKEY_free(pkey); 1609 EVP_MD_CTX_cleanup(&md_ctx); 1610 1611 return (-1); 1612 } 1613 1614 int 1615 ssl3_get_certificate_request(SSL *s) 1616 { 1617 int ok, ret = 0; 1618 long n; 1619 CBS cert_request, cert_types, rdn_list; 1620 X509_NAME *xn = NULL; 1621 const unsigned char *q; 1622 STACK_OF(X509_NAME) *ca_sk = NULL; 1623 1624 n = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1625 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1626 if (!ok) 1627 return ((int)n); 1628 1629 S3I(s)->hs.tls12.cert_request = 0; 1630 1631 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_DONE) { 1632 S3I(s)->hs.tls12.reuse_message = 1; 1633 /* 1634 * If we get here we don't need any cached handshake records 1635 * as we wont be doing client auth. 1636 */ 1637 tls1_transcript_free(s); 1638 return (1); 1639 } 1640 1641 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1642 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1643 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1644 goto err; 1645 } 1646 1647 /* TLS does not like anon-DH with client cert */ 1648 if (S3I(s)->hs.cipher->algorithm_auth & SSL_aNULL) { 1649 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1650 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1651 goto err; 1652 } 1653 1654 if (n < 0) 1655 goto decode_err; 1656 CBS_init(&cert_request, s->internal->init_msg, n); 1657 1658 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1659 SSLerror(s, ERR_R_MALLOC_FAILURE); 1660 goto err; 1661 } 1662 1663 if (!CBS_get_u8_length_prefixed(&cert_request, &cert_types)) 1664 goto decode_err; 1665 1666 if (SSL_USE_SIGALGS(s)) { 1667 CBS sigalgs; 1668 1669 if (CBS_len(&cert_request) < 2) { 1670 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1671 goto err; 1672 } 1673 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1674 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1675 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1676 goto err; 1677 } 1678 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1679 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1680 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1681 goto err; 1682 } 1683 if (!CBS_stow(&sigalgs, &S3I(s)->hs.sigalgs, 1684 &S3I(s)->hs.sigalgs_len)) 1685 goto err; 1686 } 1687 1688 /* get the CA RDNs */ 1689 if (CBS_len(&cert_request) < 2) { 1690 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1691 goto err; 1692 } 1693 1694 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1695 CBS_len(&cert_request) != 0) { 1696 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1697 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1698 goto err; 1699 } 1700 1701 while (CBS_len(&rdn_list) > 0) { 1702 CBS rdn; 1703 1704 if (CBS_len(&rdn_list) < 2) { 1705 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1706 goto err; 1707 } 1708 1709 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1710 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1711 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1712 goto err; 1713 } 1714 1715 q = CBS_data(&rdn); 1716 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1717 ssl3_send_alert(s, SSL3_AL_FATAL, 1718 SSL_AD_DECODE_ERROR); 1719 SSLerror(s, ERR_R_ASN1_LIB); 1720 goto err; 1721 } 1722 1723 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1724 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1725 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1726 goto err; 1727 } 1728 if (!sk_X509_NAME_push(ca_sk, xn)) { 1729 SSLerror(s, ERR_R_MALLOC_FAILURE); 1730 goto err; 1731 } 1732 xn = NULL; /* avoid free in err block */ 1733 } 1734 1735 /* we should setup a certificate to return.... */ 1736 S3I(s)->hs.tls12.cert_request = 1; 1737 sk_X509_NAME_pop_free(S3I(s)->hs.tls12.ca_names, X509_NAME_free); 1738 S3I(s)->hs.tls12.ca_names = ca_sk; 1739 ca_sk = NULL; 1740 1741 ret = 1; 1742 if (0) { 1743 decode_err: 1744 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1745 } 1746 err: 1747 X509_NAME_free(xn); 1748 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1749 return (ret); 1750 } 1751 1752 static int 1753 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1754 { 1755 return (X509_NAME_cmp(*a, *b)); 1756 } 1757 1758 int 1759 ssl3_get_new_session_ticket(SSL *s) 1760 { 1761 int ok, al, ret = 0; 1762 uint32_t lifetime_hint; 1763 long n; 1764 CBS cbs, session_ticket; 1765 1766 n = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1767 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1768 if (!ok) 1769 return ((int)n); 1770 1771 if (S3I(s)->hs.tls12.message_type == SSL3_MT_FINISHED) { 1772 S3I(s)->hs.tls12.reuse_message = 1; 1773 return (1); 1774 } 1775 if (S3I(s)->hs.tls12.message_type != SSL3_MT_NEWSESSION_TICKET) { 1776 al = SSL_AD_UNEXPECTED_MESSAGE; 1777 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1778 goto fatal_err; 1779 } 1780 1781 if (n < 0) { 1782 al = SSL_AD_DECODE_ERROR; 1783 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1784 goto fatal_err; 1785 } 1786 1787 CBS_init(&cbs, s->internal->init_msg, n); 1788 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1789 #if UINT32_MAX > LONG_MAX 1790 lifetime_hint > LONG_MAX || 1791 #endif 1792 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1793 CBS_len(&cbs) != 0) { 1794 al = SSL_AD_DECODE_ERROR; 1795 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1796 goto fatal_err; 1797 } 1798 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1799 1800 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1801 &s->session->tlsext_ticklen)) { 1802 SSLerror(s, ERR_R_MALLOC_FAILURE); 1803 goto err; 1804 } 1805 1806 /* 1807 * There are two ways to detect a resumed ticket sesion. 1808 * One is to set an appropriate session ID and then the server 1809 * must return a match in ServerHello. This allows the normal 1810 * client session ID matching to work and we know much 1811 * earlier that the ticket has been accepted. 1812 * 1813 * The other way is to set zero length session ID when the 1814 * ticket is presented and rely on the handshake to determine 1815 * session resumption. 1816 * 1817 * We choose the former approach because this fits in with 1818 * assumptions elsewhere in OpenSSL. The session ID is set 1819 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1820 * ticket. 1821 */ 1822 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1823 s->session->session_id, &s->session->session_id_length, 1824 EVP_sha256(), NULL); 1825 ret = 1; 1826 return (ret); 1827 fatal_err: 1828 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1829 err: 1830 return (-1); 1831 } 1832 1833 int 1834 ssl3_get_cert_status(SSL *s) 1835 { 1836 CBS cert_status, response; 1837 int ok, al; 1838 long n; 1839 uint8_t status_type; 1840 1841 n = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1842 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 1843 16384, &ok); 1844 if (!ok) 1845 return ((int)n); 1846 1847 if (n < 0) { 1848 /* need at least status type + length */ 1849 al = SSL_AD_DECODE_ERROR; 1850 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1851 goto fatal_err; 1852 } 1853 1854 CBS_init(&cert_status, s->internal->init_msg, n); 1855 if (!CBS_get_u8(&cert_status, &status_type) || 1856 CBS_len(&cert_status) < 3) { 1857 /* need at least status type + length */ 1858 al = SSL_AD_DECODE_ERROR; 1859 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1860 goto fatal_err; 1861 } 1862 1863 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1864 al = SSL_AD_DECODE_ERROR; 1865 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1866 goto fatal_err; 1867 } 1868 1869 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1870 CBS_len(&cert_status) != 0) { 1871 al = SSL_AD_DECODE_ERROR; 1872 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1873 goto fatal_err; 1874 } 1875 1876 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1877 &s->internal->tlsext_ocsp_resp_len)) { 1878 al = SSL_AD_INTERNAL_ERROR; 1879 SSLerror(s, ERR_R_MALLOC_FAILURE); 1880 goto fatal_err; 1881 } 1882 1883 if (s->ctx->internal->tlsext_status_cb) { 1884 int ret; 1885 ret = s->ctx->internal->tlsext_status_cb(s, 1886 s->ctx->internal->tlsext_status_arg); 1887 if (ret == 0) { 1888 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1889 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1890 goto fatal_err; 1891 } 1892 if (ret < 0) { 1893 al = SSL_AD_INTERNAL_ERROR; 1894 SSLerror(s, ERR_R_MALLOC_FAILURE); 1895 goto fatal_err; 1896 } 1897 } 1898 return (1); 1899 fatal_err: 1900 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1901 return (-1); 1902 } 1903 1904 int 1905 ssl3_get_server_done(SSL *s) 1906 { 1907 int ok, ret = 0; 1908 long n; 1909 1910 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1911 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1912 30, /* should be very small, like 0 :-) */ &ok); 1913 if (!ok) 1914 return ((int)n); 1915 1916 if (n > 0) { 1917 /* should contain no data */ 1918 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1919 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1920 return (-1); 1921 } 1922 ret = 1; 1923 return (ret); 1924 } 1925 1926 static int 1927 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1928 { 1929 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1930 unsigned char *enc_pms = NULL; 1931 EVP_PKEY *pkey = NULL; 1932 int ret = -1; 1933 int enc_len; 1934 CBB epms; 1935 1936 /* 1937 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1938 */ 1939 1940 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA].x509); 1941 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1942 pkey->pkey.rsa == NULL) { 1943 SSLerror(s, ERR_R_INTERNAL_ERROR); 1944 goto err; 1945 } 1946 1947 /* XXX - our max protocol version. */ 1948 pms[0] = s->client_version >> 8; 1949 pms[1] = s->client_version & 0xff; 1950 arc4random_buf(&pms[2], sizeof(pms) - 2); 1951 1952 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1953 SSLerror(s, ERR_R_MALLOC_FAILURE); 1954 goto err; 1955 } 1956 1957 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 1958 RSA_PKCS1_PADDING); 1959 if (enc_len <= 0) { 1960 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1961 goto err; 1962 } 1963 1964 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1965 goto err; 1966 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 1967 goto err; 1968 if (!CBB_flush(cbb)) 1969 goto err; 1970 1971 if (!tls12_derive_master_secret(s, pms, sizeof(pms))) 1972 goto err; 1973 1974 ret = 1; 1975 1976 err: 1977 explicit_bzero(pms, sizeof(pms)); 1978 EVP_PKEY_free(pkey); 1979 free(enc_pms); 1980 1981 return (ret); 1982 } 1983 1984 static int 1985 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1986 { 1987 DH *dh_srvr = NULL, *dh_clnt = NULL; 1988 unsigned char *key = NULL; 1989 int key_size = 0, key_len; 1990 unsigned char *data; 1991 int ret = -1; 1992 CBB dh_Yc; 1993 1994 /* Ensure that we have an ephemeral key for DHE. */ 1995 if (sess_cert->peer_dh_tmp == NULL) { 1996 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1997 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1998 goto err; 1999 } 2000 dh_srvr = sess_cert->peer_dh_tmp; 2001 2002 /* Generate a new random key. */ 2003 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2004 SSLerror(s, ERR_R_DH_LIB); 2005 goto err; 2006 } 2007 if (!DH_generate_key(dh_clnt)) { 2008 SSLerror(s, ERR_R_DH_LIB); 2009 goto err; 2010 } 2011 if ((key_size = DH_size(dh_clnt)) <= 0) { 2012 SSLerror(s, ERR_R_DH_LIB); 2013 goto err; 2014 } 2015 if ((key = malloc(key_size)) == NULL) { 2016 SSLerror(s, ERR_R_MALLOC_FAILURE); 2017 goto err; 2018 } 2019 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) { 2020 SSLerror(s, ERR_R_DH_LIB); 2021 goto err; 2022 } 2023 2024 if (!tls12_derive_master_secret(s, key, key_len)) 2025 goto err; 2026 2027 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2028 goto err; 2029 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2030 goto err; 2031 BN_bn2bin(dh_clnt->pub_key, data); 2032 if (!CBB_flush(cbb)) 2033 goto err; 2034 2035 ret = 1; 2036 2037 err: 2038 DH_free(dh_clnt); 2039 freezero(key, key_size); 2040 2041 return (ret); 2042 } 2043 2044 static int 2045 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2046 { 2047 EC_KEY *ecdh = NULL; 2048 uint8_t *key = NULL; 2049 size_t key_len = 0; 2050 int ret = -1; 2051 CBB ecpoint; 2052 2053 if ((ecdh = EC_KEY_new()) == NULL) { 2054 SSLerror(s, ERR_R_MALLOC_FAILURE); 2055 goto err; 2056 } 2057 2058 if (!ssl_kex_generate_ecdhe_ecp(ecdh, sc->peer_nid)) 2059 goto err; 2060 2061 /* Encode our public key. */ 2062 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2063 goto err; 2064 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 2065 goto err; 2066 if (!CBB_flush(cbb)) 2067 goto err; 2068 2069 if (!ssl_kex_derive_ecdhe_ecp(ecdh, sc->peer_ecdh_tmp, &key, &key_len)) 2070 goto err; 2071 if (!tls12_derive_master_secret(s, key, key_len)) 2072 goto err; 2073 2074 ret = 1; 2075 2076 err: 2077 freezero(key, key_len); 2078 EC_KEY_free(ecdh); 2079 2080 return (ret); 2081 } 2082 2083 static int 2084 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2085 { 2086 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2087 int ret = -1; 2088 CBB ecpoint; 2089 2090 /* Generate X25519 key pair and derive shared key. */ 2091 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2092 goto err; 2093 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2094 goto err; 2095 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2096 goto err; 2097 X25519_keypair(public_key, private_key); 2098 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2099 goto err; 2100 2101 /* Serialize the public key. */ 2102 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2103 goto err; 2104 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2105 goto err; 2106 if (!CBB_flush(cbb)) 2107 goto err; 2108 2109 if (!tls12_derive_master_secret(s, shared_key, X25519_KEY_LENGTH)) 2110 goto err; 2111 2112 ret = 1; 2113 2114 err: 2115 free(public_key); 2116 freezero(private_key, X25519_KEY_LENGTH); 2117 freezero(shared_key, X25519_KEY_LENGTH); 2118 2119 return (ret); 2120 } 2121 2122 static int 2123 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2124 { 2125 if (sc->peer_x25519_tmp != NULL) { 2126 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2127 goto err; 2128 } else if (sc->peer_ecdh_tmp != NULL) { 2129 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2130 goto err; 2131 } else { 2132 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2133 SSLerror(s, ERR_R_INTERNAL_ERROR); 2134 goto err; 2135 } 2136 2137 return (1); 2138 2139 err: 2140 return (-1); 2141 } 2142 2143 static int 2144 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2145 { 2146 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2147 EVP_PKEY *pub_key = NULL; 2148 EVP_PKEY_CTX *pkey_ctx; 2149 X509 *peer_cert; 2150 size_t msglen; 2151 unsigned int md_len; 2152 EVP_MD_CTX *ukm_hash; 2153 int ret = -1; 2154 int nid; 2155 CBB gostblob; 2156 2157 /* Get server sertificate PKEY and create ctx from it */ 2158 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2159 if (peer_cert == NULL) { 2160 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2161 goto err; 2162 } 2163 2164 pub_key = X509_get_pubkey(peer_cert); 2165 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2166 2167 /* 2168 * If we have send a certificate, and certificate key parameters match 2169 * those of server certificate, use certificate key for key exchange. 2170 * Otherwise, generate ephemeral key pair. 2171 */ 2172 EVP_PKEY_encrypt_init(pkey_ctx); 2173 2174 /* Generate session key. */ 2175 arc4random_buf(premaster_secret, 32); 2176 2177 /* 2178 * If we have client certificate, use its secret as peer key. 2179 */ 2180 if (S3I(s)->hs.tls12.cert_request && s->cert->key->privatekey) { 2181 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2182 s->cert->key->privatekey) <=0) { 2183 /* 2184 * If there was an error - just ignore it. 2185 * Ephemeral key would be used. 2186 */ 2187 ERR_clear_error(); 2188 } 2189 } 2190 2191 /* 2192 * Compute shared IV and store it in algorithm-specific context data. 2193 */ 2194 ukm_hash = EVP_MD_CTX_new(); 2195 if (ukm_hash == NULL) { 2196 SSLerror(s, ERR_R_MALLOC_FAILURE); 2197 goto err; 2198 } 2199 2200 /* XXX check handshake hash instead. */ 2201 if (S3I(s)->hs.cipher->algorithm2 & SSL_HANDSHAKE_MAC_GOST94) 2202 nid = NID_id_GostR3411_94; 2203 else 2204 nid = NID_id_tc26_gost3411_2012_256; 2205 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2206 goto err; 2207 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2208 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2209 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2210 EVP_MD_CTX_free(ukm_hash); 2211 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2212 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2213 SSLerror(s, SSL_R_LIBRARY_BUG); 2214 goto err; 2215 } 2216 2217 /* 2218 * Make GOST keytransport blob message, encapsulate it into sequence. 2219 */ 2220 msglen = 255; 2221 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2222 32) < 0) { 2223 SSLerror(s, SSL_R_LIBRARY_BUG); 2224 goto err; 2225 } 2226 2227 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2228 goto err; 2229 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2230 goto err; 2231 if (!CBB_flush(cbb)) 2232 goto err; 2233 2234 /* Check if pubkey from client certificate was used. */ 2235 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2236 NULL) > 0) { 2237 /* Set flag "skip certificate verify". */ 2238 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2239 } 2240 EVP_PKEY_CTX_free(pkey_ctx); 2241 2242 if (!tls12_derive_master_secret(s, premaster_secret, 32)) 2243 goto err; 2244 2245 ret = 1; 2246 2247 err: 2248 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2249 EVP_PKEY_free(pub_key); 2250 2251 return (ret); 2252 } 2253 2254 int 2255 ssl3_send_client_key_exchange(SSL *s) 2256 { 2257 SESS_CERT *sess_cert; 2258 unsigned long alg_k; 2259 CBB cbb, kex; 2260 2261 memset(&cbb, 0, sizeof(cbb)); 2262 2263 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2264 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2265 2266 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2267 ssl3_send_alert(s, SSL3_AL_FATAL, 2268 SSL_AD_UNEXPECTED_MESSAGE); 2269 SSLerror(s, ERR_R_INTERNAL_ERROR); 2270 goto err; 2271 } 2272 2273 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2274 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2275 goto err; 2276 2277 if (alg_k & SSL_kRSA) { 2278 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2279 goto err; 2280 } else if (alg_k & SSL_kDHE) { 2281 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2282 goto err; 2283 } else if (alg_k & SSL_kECDHE) { 2284 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2285 goto err; 2286 } else if (alg_k & SSL_kGOST) { 2287 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2288 goto err; 2289 } else { 2290 ssl3_send_alert(s, SSL3_AL_FATAL, 2291 SSL_AD_HANDSHAKE_FAILURE); 2292 SSLerror(s, ERR_R_INTERNAL_ERROR); 2293 goto err; 2294 } 2295 2296 if (!ssl3_handshake_msg_finish(s, &cbb)) 2297 goto err; 2298 2299 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2300 } 2301 2302 /* SSL3_ST_CW_KEY_EXCH_B */ 2303 return (ssl3_handshake_write(s)); 2304 2305 err: 2306 CBB_cleanup(&cbb); 2307 2308 return (-1); 2309 } 2310 2311 static int 2312 ssl3_send_client_verify_sigalgs(SSL *s, EVP_PKEY *pkey, 2313 const struct ssl_sigalg *sigalg, CBB *cert_verify) 2314 { 2315 CBB cbb_signature; 2316 EVP_PKEY_CTX *pctx = NULL; 2317 EVP_MD_CTX mctx; 2318 const unsigned char *hdata; 2319 unsigned char *signature = NULL; 2320 size_t signature_len, hdata_len; 2321 int ret = 0; 2322 2323 EVP_MD_CTX_init(&mctx); 2324 2325 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2326 SSLerror(s, ERR_R_INTERNAL_ERROR); 2327 goto err; 2328 } 2329 if (!EVP_DigestSignInit(&mctx, &pctx, sigalg->md(), NULL, pkey)) { 2330 SSLerror(s, ERR_R_EVP_LIB); 2331 goto err; 2332 } 2333 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2334 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2335 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2336 SSLerror(s, ERR_R_EVP_LIB); 2337 goto err; 2338 } 2339 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2340 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2341 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2342 SSLerror(s, ERR_R_EVP_LIB); 2343 goto err; 2344 } 2345 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2346 SSLerror(s, ERR_R_EVP_LIB); 2347 goto err; 2348 } 2349 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2350 signature_len == 0) { 2351 SSLerror(s, ERR_R_EVP_LIB); 2352 goto err; 2353 } 2354 if ((signature = calloc(1, signature_len)) == NULL) { 2355 SSLerror(s, ERR_R_MALLOC_FAILURE); 2356 goto err; 2357 } 2358 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2359 SSLerror(s, ERR_R_EVP_LIB); 2360 goto err; 2361 } 2362 2363 if (!CBB_add_u16(cert_verify, sigalg->value)) 2364 goto err; 2365 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2366 goto err; 2367 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2368 goto err; 2369 if (!CBB_flush(cert_verify)) 2370 goto err; 2371 2372 ret = 1; 2373 2374 err: 2375 EVP_MD_CTX_cleanup(&mctx); 2376 free(signature); 2377 return ret; 2378 } 2379 2380 static int 2381 ssl3_send_client_verify_rsa(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2382 { 2383 CBB cbb_signature; 2384 unsigned char data[EVP_MAX_MD_SIZE]; 2385 unsigned char *signature = NULL; 2386 unsigned int signature_len; 2387 size_t data_len; 2388 int ret = 0; 2389 2390 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2391 goto err; 2392 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2393 goto err; 2394 if (RSA_sign(NID_md5_sha1, data, data_len, signature, 2395 &signature_len, pkey->pkey.rsa) <= 0 ) { 2396 SSLerror(s, ERR_R_RSA_LIB); 2397 goto err; 2398 } 2399 2400 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2401 goto err; 2402 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2403 goto err; 2404 if (!CBB_flush(cert_verify)) 2405 goto err; 2406 2407 ret = 1; 2408 err: 2409 free(signature); 2410 return ret; 2411 } 2412 2413 static int 2414 ssl3_send_client_verify_ec(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2415 { 2416 CBB cbb_signature; 2417 unsigned char data[EVP_MAX_MD_SIZE]; 2418 unsigned char *signature = NULL; 2419 unsigned int signature_len; 2420 int ret = 0; 2421 2422 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2423 goto err; 2424 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2425 goto err; 2426 if (!ECDSA_sign(pkey->save_type, &data[MD5_DIGEST_LENGTH], 2427 SHA_DIGEST_LENGTH, signature, &signature_len, pkey->pkey.ec)) { 2428 SSLerror(s, ERR_R_ECDSA_LIB); 2429 goto err; 2430 } 2431 2432 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2433 goto err; 2434 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2435 goto err; 2436 if (!CBB_flush(cert_verify)) 2437 goto err; 2438 2439 ret = 1; 2440 err: 2441 free(signature); 2442 return ret; 2443 } 2444 2445 #ifndef OPENSSL_NO_GOST 2446 static int 2447 ssl3_send_client_verify_gost(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2448 { 2449 CBB cbb_signature; 2450 EVP_MD_CTX mctx; 2451 EVP_PKEY_CTX *pctx; 2452 const EVP_MD *md; 2453 const unsigned char *hdata; 2454 unsigned char *signature = NULL; 2455 size_t signature_len; 2456 size_t hdata_len; 2457 int nid; 2458 int ret = 0; 2459 2460 EVP_MD_CTX_init(&mctx); 2461 2462 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2463 SSLerror(s, ERR_R_INTERNAL_ERROR); 2464 goto err; 2465 } 2466 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2467 (md = EVP_get_digestbynid(nid)) == NULL) { 2468 SSLerror(s, ERR_R_EVP_LIB); 2469 goto err; 2470 } 2471 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2472 SSLerror(s, ERR_R_EVP_LIB); 2473 goto err; 2474 } 2475 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2476 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2477 SSLerror(s, ERR_R_EVP_LIB); 2478 goto err; 2479 } 2480 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2481 SSLerror(s, ERR_R_EVP_LIB); 2482 goto err; 2483 } 2484 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2485 signature_len == 0) { 2486 SSLerror(s, ERR_R_EVP_LIB); 2487 goto err; 2488 } 2489 if ((signature = calloc(1, signature_len)) == NULL) { 2490 SSLerror(s, ERR_R_MALLOC_FAILURE); 2491 goto err; 2492 } 2493 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2494 SSLerror(s, ERR_R_EVP_LIB); 2495 goto err; 2496 } 2497 2498 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2499 goto err; 2500 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2501 goto err; 2502 if (!CBB_flush(cert_verify)) 2503 goto err; 2504 2505 ret = 1; 2506 err: 2507 EVP_MD_CTX_cleanup(&mctx); 2508 free(signature); 2509 return ret; 2510 } 2511 #endif 2512 2513 int 2514 ssl3_send_client_verify(SSL *s) 2515 { 2516 const struct ssl_sigalg *sigalg; 2517 CBB cbb, cert_verify; 2518 EVP_PKEY *pkey; 2519 2520 memset(&cbb, 0, sizeof(cbb)); 2521 2522 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2523 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2524 SSL3_MT_CERTIFICATE_VERIFY)) 2525 goto err; 2526 2527 pkey = s->cert->key->privatekey; 2528 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2529 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2530 goto err; 2531 } 2532 S3I(s)->hs.our_sigalg = sigalg; 2533 2534 /* 2535 * For TLS v1.2 send signature algorithm and signature using 2536 * agreed digest and cached handshake records. 2537 */ 2538 if (SSL_USE_SIGALGS(s)) { 2539 if (!ssl3_send_client_verify_sigalgs(s, pkey, sigalg, 2540 &cert_verify)) 2541 goto err; 2542 } else if (pkey->type == EVP_PKEY_RSA) { 2543 if (!ssl3_send_client_verify_rsa(s, pkey, &cert_verify)) 2544 goto err; 2545 } else if (pkey->type == EVP_PKEY_EC) { 2546 if (!ssl3_send_client_verify_ec(s, pkey, &cert_verify)) 2547 goto err; 2548 #ifndef OPENSSL_NO_GOST 2549 } else if (pkey->type == NID_id_GostR3410_94 || 2550 pkey->type == NID_id_GostR3410_2001) { 2551 if (!ssl3_send_client_verify_gost(s, pkey, &cert_verify)) 2552 goto err; 2553 #endif 2554 } else { 2555 SSLerror(s, ERR_R_INTERNAL_ERROR); 2556 goto err; 2557 } 2558 2559 tls1_transcript_free(s); 2560 2561 if (!ssl3_handshake_msg_finish(s, &cbb)) 2562 goto err; 2563 2564 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2565 } 2566 2567 return (ssl3_handshake_write(s)); 2568 2569 err: 2570 CBB_cleanup(&cbb); 2571 2572 return (-1); 2573 } 2574 2575 int 2576 ssl3_send_client_certificate(SSL *s) 2577 { 2578 EVP_PKEY *pkey = NULL; 2579 X509 *x509 = NULL; 2580 CBB cbb, client_cert; 2581 int i; 2582 2583 memset(&cbb, 0, sizeof(cbb)); 2584 2585 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2586 if (s->cert->key->x509 == NULL || 2587 s->cert->key->privatekey == NULL) 2588 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2589 else 2590 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2591 } 2592 2593 /* We need to get a client cert */ 2594 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2595 /* 2596 * If we get an error, we need to 2597 * ssl->internal->rwstate = SSL_X509_LOOKUP; return(-1); 2598 * We then get retried later. 2599 */ 2600 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2601 if (i < 0) { 2602 s->internal->rwstate = SSL_X509_LOOKUP; 2603 return (-1); 2604 } 2605 s->internal->rwstate = SSL_NOTHING; 2606 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2607 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2608 if (!SSL_use_certificate(s, x509) || 2609 !SSL_use_PrivateKey(s, pkey)) 2610 i = 0; 2611 } else if (i == 1) { 2612 i = 0; 2613 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2614 } 2615 2616 X509_free(x509); 2617 EVP_PKEY_free(pkey); 2618 if (i == 0) { 2619 S3I(s)->hs.tls12.cert_request = 2; 2620 2621 /* There is no client certificate to verify. */ 2622 tls1_transcript_free(s); 2623 } 2624 2625 /* Ok, we have a cert */ 2626 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2627 } 2628 2629 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2630 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2631 SSL3_MT_CERTIFICATE)) 2632 goto err; 2633 if (!ssl3_output_cert_chain(s, &client_cert, 2634 (S3I(s)->hs.tls12.cert_request == 2) ? NULL : s->cert->key)) 2635 goto err; 2636 if (!ssl3_handshake_msg_finish(s, &cbb)) 2637 goto err; 2638 2639 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2640 } 2641 2642 /* SSL3_ST_CW_CERT_D */ 2643 return (ssl3_handshake_write(s)); 2644 2645 err: 2646 CBB_cleanup(&cbb); 2647 2648 return (0); 2649 } 2650 2651 #define has_bits(i,m) (((i)&(m)) == (m)) 2652 2653 int 2654 ssl3_check_cert_and_algorithm(SSL *s) 2655 { 2656 int i, idx; 2657 long alg_k, alg_a; 2658 EVP_PKEY *pkey = NULL; 2659 SESS_CERT *sc; 2660 DH *dh; 2661 2662 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2663 alg_a = S3I(s)->hs.cipher->algorithm_auth; 2664 2665 /* We don't have a certificate. */ 2666 if (alg_a & SSL_aNULL) 2667 return (1); 2668 2669 sc = SSI(s)->sess_cert; 2670 if (sc == NULL) { 2671 SSLerror(s, ERR_R_INTERNAL_ERROR); 2672 goto err; 2673 } 2674 dh = SSI(s)->sess_cert->peer_dh_tmp; 2675 2676 /* This is the passed certificate. */ 2677 2678 idx = sc->peer_cert_type; 2679 if (idx == SSL_PKEY_ECC) { 2680 if (ssl_check_srvr_ecc_cert_and_alg( 2681 sc->peer_pkeys[idx].x509, s) == 0) { 2682 /* check failed */ 2683 SSLerror(s, SSL_R_BAD_ECC_CERT); 2684 goto fatal_err; 2685 } else { 2686 return (1); 2687 } 2688 } 2689 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2690 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2691 EVP_PKEY_free(pkey); 2692 2693 /* Check that we have a certificate if we require one. */ 2694 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2695 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2696 goto fatal_err; 2697 } 2698 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2699 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2700 goto fatal_err; 2701 } 2702 if ((alg_k & SSL_kDHE) && 2703 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2704 SSLerror(s, SSL_R_MISSING_DH_KEY); 2705 goto fatal_err; 2706 } 2707 2708 return (1); 2709 fatal_err: 2710 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2711 err: 2712 return (0); 2713 } 2714 2715 /* 2716 * Check to see if handshake is full or resumed. Usually this is just a 2717 * case of checking to see if a cache hit has occurred. In the case of 2718 * session tickets we have to check the next message to be sure. 2719 */ 2720 2721 int 2722 ssl3_check_finished(SSL *s) 2723 { 2724 int ok; 2725 long n; 2726 2727 /* If we have no ticket it cannot be a resumed session. */ 2728 if (!s->session->tlsext_tick) 2729 return (1); 2730 /* this function is called when we really expect a Certificate 2731 * message, so permit appropriate message length */ 2732 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2733 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2734 if (!ok) 2735 return ((int)n); 2736 2737 S3I(s)->hs.tls12.reuse_message = 1; 2738 if ((S3I(s)->hs.tls12.message_type == SSL3_MT_FINISHED) || 2739 (S3I(s)->hs.tls12.message_type == SSL3_MT_NEWSESSION_TICKET)) 2740 return (2); 2741 2742 return (1); 2743 } 2744 2745 int 2746 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2747 { 2748 int i = 0; 2749 2750 #ifndef OPENSSL_NO_ENGINE 2751 if (s->ctx->internal->client_cert_engine) { 2752 i = ENGINE_load_ssl_client_cert( 2753 s->ctx->internal->client_cert_engine, s, 2754 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2755 if (i != 0) 2756 return (i); 2757 } 2758 #endif 2759 if (s->ctx->internal->client_cert_cb) 2760 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2761 return (i); 2762 } 2763