1 /* $OpenBSD: ssl_clnt.c,v 1.118 2021/11/19 18:53:10 tb Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 /* ==================================================================== 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 /* ==================================================================== 112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 113 * 114 * Portions of the attached software ("Contribution") are developed by 115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 116 * 117 * The Contribution is licensed pursuant to the OpenSSL open source 118 * license provided above. 119 * 120 * ECC cipher suite support in OpenSSL originally written by 121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. 122 * 123 */ 124 /* ==================================================================== 125 * Copyright 2005 Nokia. All rights reserved. 126 * 127 * The portions of the attached software ("Contribution") is developed by 128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 129 * license. 130 * 131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 133 * support (see RFC 4279) to OpenSSL. 134 * 135 * No patent licenses or other rights except those expressly stated in 136 * the OpenSSL open source license shall be deemed granted or received 137 * expressly, by implication, estoppel, or otherwise. 138 * 139 * No assurances are provided by Nokia that the Contribution does not 140 * infringe the patent or other intellectual property rights of any third 141 * party or that the license provides you with all the necessary rights 142 * to make use of the Contribution. 143 * 144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 148 * OTHERWISE. 149 */ 150 151 #include <limits.h> 152 #include <stdint.h> 153 #include <stdio.h> 154 155 #include <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 s->d1->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) && s->d1->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 (s->d1->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 s->d1->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 s->d1->handshake_read_seq = 0; 599 s->d1->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->version = max_version; 654 655 if (sess == NULL || 656 sess->ssl_version != s->version || 657 (!sess->session_id_length && !sess->tlsext_tick) || 658 sess->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) || s->d1->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 if (!CBB_add_u16(&client_hello, s->version)) 677 goto err; 678 679 /* Random stuff */ 680 if (!CBB_add_bytes(&client_hello, s->s3->client_random, 681 sizeof(s->s3->client_random))) 682 goto err; 683 684 /* Session ID */ 685 if (!CBB_add_u8_length_prefixed(&client_hello, &session_id)) 686 goto err; 687 if (!s->internal->new_session && 688 s->session->session_id_length > 0) { 689 sl = s->session->session_id_length; 690 if (sl > sizeof(s->session->session_id)) { 691 SSLerror(s, ERR_R_INTERNAL_ERROR); 692 goto err; 693 } 694 if (!CBB_add_bytes(&session_id, 695 s->session->session_id, sl)) 696 goto err; 697 } 698 699 /* DTLS Cookie. */ 700 if (SSL_is_dtls(s)) { 701 if (s->d1->cookie_len > sizeof(s->d1->cookie)) { 702 SSLerror(s, ERR_R_INTERNAL_ERROR); 703 goto err; 704 } 705 if (!CBB_add_u8_length_prefixed(&client_hello, &cookie)) 706 goto err; 707 if (!CBB_add_bytes(&cookie, s->d1->cookie, 708 s->d1->cookie_len)) 709 goto err; 710 } 711 712 /* Ciphers supported */ 713 if (!CBB_add_u16_length_prefixed(&client_hello, &cipher_suites)) 714 return 0; 715 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), 716 &cipher_suites)) { 717 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE); 718 goto err; 719 } 720 721 /* Add in compression methods (null) */ 722 if (!CBB_add_u8_length_prefixed(&client_hello, 723 &compression_methods)) 724 goto err; 725 if (!CBB_add_u8(&compression_methods, 0)) 726 goto err; 727 728 /* TLS extensions */ 729 if (!tlsext_client_build(s, SSL_TLSEXT_MSG_CH, &client_hello)) { 730 SSLerror(s, ERR_R_INTERNAL_ERROR); 731 goto err; 732 } 733 734 if (!ssl3_handshake_msg_finish(s, &cbb)) 735 goto err; 736 737 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_B; 738 } 739 740 /* SSL3_ST_CW_CLNT_HELLO_B */ 741 return (ssl3_handshake_write(s)); 742 743 err: 744 CBB_cleanup(&cbb); 745 746 return (-1); 747 } 748 749 int 750 ssl3_get_dtls_hello_verify(SSL *s) 751 { 752 CBS hello_verify_request, cookie; 753 size_t cookie_len; 754 uint16_t ssl_version; 755 int al, ret; 756 757 if ((ret = ssl3_get_message(s, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 758 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, s->internal->max_cert_list)) <= 0) 759 return ret; 760 761 if (S3I(s)->hs.tls12.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 762 s->d1->send_cookie = 0; 763 S3I(s)->hs.tls12.reuse_message = 1; 764 return (1); 765 } 766 767 if (s->internal->init_num < 0) 768 goto decode_err; 769 770 CBS_init(&hello_verify_request, s->internal->init_msg, 771 s->internal->init_num); 772 773 if (!CBS_get_u16(&hello_verify_request, &ssl_version)) 774 goto decode_err; 775 if (!CBS_get_u8_length_prefixed(&hello_verify_request, &cookie)) 776 goto decode_err; 777 if (CBS_len(&hello_verify_request) != 0) 778 goto decode_err; 779 780 /* 781 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should always 782 * contain DTLSv1.0 the version that is going to be negotiated. 783 * Tolerate DTLSv1.2 just in case. 784 */ 785 if (ssl_version != DTLS1_VERSION && ssl_version != DTLS1_2_VERSION) { 786 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 787 s->version = (s->version & 0xff00) | (ssl_version & 0xff); 788 al = SSL_AD_PROTOCOL_VERSION; 789 goto fatal_err; 790 } 791 792 if (!CBS_write_bytes(&cookie, s->d1->cookie, 793 sizeof(s->d1->cookie), &cookie_len)) { 794 s->d1->cookie_len = 0; 795 al = SSL_AD_ILLEGAL_PARAMETER; 796 goto fatal_err; 797 } 798 s->d1->cookie_len = cookie_len; 799 s->d1->send_cookie = 1; 800 801 return 1; 802 803 decode_err: 804 al = SSL_AD_DECODE_ERROR; 805 fatal_err: 806 ssl3_send_alert(s, SSL3_AL_FATAL, al); 807 return -1; 808 } 809 810 int 811 ssl3_get_server_hello(SSL *s) 812 { 813 CBS cbs, server_random, session_id; 814 uint16_t server_version, cipher_suite; 815 uint8_t compression_method; 816 const SSL_CIPHER *cipher; 817 const SSL_METHOD *method; 818 unsigned long alg_k; 819 size_t outlen; 820 int al, ret; 821 822 s->internal->first_packet = 1; 823 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 824 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000 /* ?? */)) <= 0) 825 return ret; 826 s->internal->first_packet = 0; 827 828 if (s->internal->init_num < 0) 829 goto decode_err; 830 831 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 832 833 if (SSL_is_dtls(s)) { 834 if (S3I(s)->hs.tls12.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 835 if (s->d1->send_cookie == 0) { 836 S3I(s)->hs.tls12.reuse_message = 1; 837 return (1); 838 } else { 839 /* Already sent a cookie. */ 840 al = SSL_AD_UNEXPECTED_MESSAGE; 841 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 842 goto fatal_err; 843 } 844 } 845 } 846 847 if (S3I(s)->hs.tls12.message_type != SSL3_MT_SERVER_HELLO) { 848 al = SSL_AD_UNEXPECTED_MESSAGE; 849 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 850 goto fatal_err; 851 } 852 853 if (!CBS_get_u16(&cbs, &server_version)) 854 goto decode_err; 855 856 if (!ssl_check_version_from_server(s, server_version)) { 857 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 858 s->version = (s->version & 0xff00) | (server_version & 0xff); 859 al = SSL_AD_PROTOCOL_VERSION; 860 goto fatal_err; 861 } 862 S3I(s)->hs.peer_legacy_version = server_version; 863 s->version = server_version; 864 865 S3I(s)->hs.negotiated_tls_version = ssl_tls_version(server_version); 866 if (S3I(s)->hs.negotiated_tls_version == 0) { 867 SSLerror(s, ERR_R_INTERNAL_ERROR); 868 goto err; 869 } 870 871 if ((method = ssl_get_method(server_version)) == NULL) { 872 SSLerror(s, ERR_R_INTERNAL_ERROR); 873 goto err; 874 } 875 s->method = method; 876 877 /* Server random. */ 878 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 879 goto decode_err; 880 if (!CBS_write_bytes(&server_random, s->s3->server_random, 881 sizeof(s->s3->server_random), NULL)) 882 goto err; 883 884 if (S3I(s)->hs.our_max_tls_version >= TLS1_2_VERSION && 885 S3I(s)->hs.negotiated_tls_version < S3I(s)->hs.our_max_tls_version) { 886 /* 887 * RFC 8446 section 4.1.3. We must not downgrade if the server 888 * random value contains the TLS 1.2 or TLS 1.1 magical value. 889 */ 890 if (!CBS_skip(&server_random, 891 CBS_len(&server_random) - sizeof(tls13_downgrade_12))) 892 goto err; 893 if (S3I(s)->hs.negotiated_tls_version == TLS1_2_VERSION && 894 CBS_mem_equal(&server_random, tls13_downgrade_12, 895 sizeof(tls13_downgrade_12))) { 896 al = SSL_AD_ILLEGAL_PARAMETER; 897 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 898 goto fatal_err; 899 } 900 if (CBS_mem_equal(&server_random, tls13_downgrade_11, 901 sizeof(tls13_downgrade_11))) { 902 al = SSL_AD_ILLEGAL_PARAMETER; 903 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 904 goto fatal_err; 905 } 906 } 907 908 /* Session ID. */ 909 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 910 goto decode_err; 911 912 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 913 al = SSL_AD_ILLEGAL_PARAMETER; 914 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 915 goto fatal_err; 916 } 917 918 /* Cipher suite. */ 919 if (!CBS_get_u16(&cbs, &cipher_suite)) 920 goto decode_err; 921 922 /* 923 * Check if we want to resume the session based on external 924 * pre-shared secret. 925 */ 926 if (s->internal->tls_session_secret_cb) { 927 SSL_CIPHER *pref_cipher = NULL; 928 s->session->master_key_length = sizeof(s->session->master_key); 929 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 930 &s->session->master_key_length, NULL, &pref_cipher, 931 s->internal->tls_session_secret_cb_arg)) { 932 s->session->cipher = pref_cipher ? pref_cipher : 933 ssl3_get_cipher_by_value(cipher_suite); 934 s->s3->flags |= SSL3_FLAGS_CCS_OK; 935 } 936 } 937 938 if (s->session->session_id_length != 0 && 939 CBS_mem_equal(&session_id, s->session->session_id, 940 s->session->session_id_length)) { 941 if (s->sid_ctx_length != s->session->sid_ctx_length || 942 timingsafe_memcmp(s->session->sid_ctx, 943 s->sid_ctx, s->sid_ctx_length) != 0) { 944 /* actually a client application bug */ 945 al = SSL_AD_ILLEGAL_PARAMETER; 946 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 947 goto fatal_err; 948 } 949 s->s3->flags |= SSL3_FLAGS_CCS_OK; 950 s->internal->hit = 1; 951 } else { 952 /* a miss or crap from the other end */ 953 954 /* If we were trying for session-id reuse, make a new 955 * SSL_SESSION so we don't stuff up other people */ 956 s->internal->hit = 0; 957 if (s->session->session_id_length > 0) { 958 if (!ssl_get_new_session(s, 0)) { 959 al = SSL_AD_INTERNAL_ERROR; 960 goto fatal_err; 961 } 962 } 963 964 /* 965 * XXX - improve the handling for the case where there is a 966 * zero length session identifier. 967 */ 968 if (!CBS_write_bytes(&session_id, s->session->session_id, 969 sizeof(s->session->session_id), &outlen)) 970 goto err; 971 s->session->session_id_length = outlen; 972 973 s->session->ssl_version = s->version; 974 } 975 976 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 977 al = SSL_AD_ILLEGAL_PARAMETER; 978 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 979 goto fatal_err; 980 } 981 982 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 983 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 984 S3I(s)->hs.negotiated_tls_version < TLS1_2_VERSION) { 985 al = SSL_AD_ILLEGAL_PARAMETER; 986 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 987 goto fatal_err; 988 } 989 990 if (!ssl_cipher_in_list(SSL_get_ciphers(s), cipher)) { 991 /* we did not say we would use this cipher */ 992 al = SSL_AD_ILLEGAL_PARAMETER; 993 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 994 goto fatal_err; 995 } 996 997 /* 998 * Depending on the session caching (internal/external), the cipher 999 * and/or cipher_id values may not be set. Make sure that 1000 * cipher_id is set and use it for comparison. 1001 */ 1002 if (s->session->cipher) 1003 s->session->cipher_id = s->session->cipher->id; 1004 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 1005 al = SSL_AD_ILLEGAL_PARAMETER; 1006 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1007 goto fatal_err; 1008 } 1009 S3I(s)->hs.cipher = cipher; 1010 1011 if (!tls1_transcript_hash_init(s)) 1012 goto err; 1013 1014 /* 1015 * Don't digest cached records if no sigalgs: we may need them for 1016 * client authentication. 1017 */ 1018 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 1019 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST))) 1020 tls1_transcript_free(s); 1021 1022 if (!CBS_get_u8(&cbs, &compression_method)) 1023 goto decode_err; 1024 1025 if (compression_method != 0) { 1026 al = SSL_AD_ILLEGAL_PARAMETER; 1027 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1028 goto fatal_err; 1029 } 1030 1031 if (!tlsext_client_parse(s, SSL_TLSEXT_MSG_SH, &cbs, &al)) { 1032 SSLerror(s, SSL_R_PARSE_TLSEXT); 1033 goto fatal_err; 1034 } 1035 1036 if (CBS_len(&cbs) != 0) 1037 goto decode_err; 1038 1039 /* 1040 * Determine if we need to see RI. Strictly speaking if we want to 1041 * avoid an attack we should *always* see RI even on initial server 1042 * hello because the client doesn't see any renegotiation during an 1043 * attack. However this would mean we could not connect to any server 1044 * which doesn't support RI so for the immediate future tolerate RI 1045 * absence on initial connect only. 1046 */ 1047 if (!S3I(s)->renegotiate_seen && 1048 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1049 al = SSL_AD_HANDSHAKE_FAILURE; 1050 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1051 goto fatal_err; 1052 } 1053 1054 if (ssl_check_serverhello_tlsext(s) <= 0) { 1055 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1056 goto err; 1057 } 1058 1059 return (1); 1060 1061 decode_err: 1062 /* wrong packet length */ 1063 al = SSL_AD_DECODE_ERROR; 1064 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1065 fatal_err: 1066 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1067 err: 1068 return (-1); 1069 } 1070 1071 int 1072 ssl3_get_server_certificate(SSL *s) 1073 { 1074 int al, i, ret; 1075 CBS cbs, cert_list; 1076 X509 *x = NULL; 1077 const unsigned char *q; 1078 STACK_OF(X509) *sk = NULL; 1079 SESS_CERT *sc; 1080 EVP_PKEY *pkey = NULL; 1081 1082 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1083 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list)) <= 0) 1084 return ret; 1085 1086 ret = -1; 1087 1088 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1089 S3I(s)->hs.tls12.reuse_message = 1; 1090 return (1); 1091 } 1092 1093 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE) { 1094 al = SSL_AD_UNEXPECTED_MESSAGE; 1095 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1096 goto fatal_err; 1097 } 1098 1099 if ((sk = sk_X509_new_null()) == NULL) { 1100 SSLerror(s, ERR_R_MALLOC_FAILURE); 1101 goto err; 1102 } 1103 1104 if (s->internal->init_num < 0) 1105 goto decode_err; 1106 1107 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 1108 if (CBS_len(&cbs) < 3) 1109 goto decode_err; 1110 1111 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1112 CBS_len(&cbs) != 0) { 1113 al = SSL_AD_DECODE_ERROR; 1114 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1115 goto fatal_err; 1116 } 1117 1118 while (CBS_len(&cert_list) > 0) { 1119 CBS cert; 1120 1121 if (CBS_len(&cert_list) < 3) 1122 goto decode_err; 1123 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1124 al = SSL_AD_DECODE_ERROR; 1125 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1126 goto fatal_err; 1127 } 1128 1129 q = CBS_data(&cert); 1130 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1131 if (x == NULL) { 1132 al = SSL_AD_BAD_CERTIFICATE; 1133 SSLerror(s, ERR_R_ASN1_LIB); 1134 goto fatal_err; 1135 } 1136 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1137 al = SSL_AD_DECODE_ERROR; 1138 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1139 goto fatal_err; 1140 } 1141 if (!sk_X509_push(sk, x)) { 1142 SSLerror(s, ERR_R_MALLOC_FAILURE); 1143 goto err; 1144 } 1145 x = NULL; 1146 } 1147 1148 i = ssl_verify_cert_chain(s, sk); 1149 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1150 al = ssl_verify_alarm_type(s->verify_result); 1151 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1152 goto fatal_err; 1153 1154 } 1155 ERR_clear_error(); /* but we keep s->verify_result */ 1156 1157 sc = ssl_sess_cert_new(); 1158 if (sc == NULL) 1159 goto err; 1160 ssl_sess_cert_free(s->session->sess_cert); 1161 s->session->sess_cert = sc; 1162 1163 sc->cert_chain = sk; 1164 /* 1165 * Inconsistency alert: cert_chain does include the peer's 1166 * certificate, which we don't include in s3_srvr.c 1167 */ 1168 x = sk_X509_value(sk, 0); 1169 sk = NULL; 1170 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1171 1172 pkey = X509_get_pubkey(x); 1173 1174 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1175 x = NULL; 1176 al = SSL3_AL_FATAL; 1177 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1178 goto fatal_err; 1179 } 1180 1181 i = ssl_cert_type(x, pkey); 1182 if (i < 0) { 1183 x = NULL; 1184 al = SSL3_AL_FATAL; 1185 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1186 goto fatal_err; 1187 } 1188 1189 sc->peer_cert_type = i; 1190 X509_up_ref(x); 1191 /* 1192 * Why would the following ever happen? 1193 * We just created sc a couple of lines ago. 1194 */ 1195 X509_free(sc->peer_pkeys[i].x509); 1196 sc->peer_pkeys[i].x509 = x; 1197 sc->peer_key = &(sc->peer_pkeys[i]); 1198 1199 X509_free(s->session->peer); 1200 X509_up_ref(x); 1201 s->session->peer = x; 1202 s->session->verify_result = s->verify_result; 1203 1204 x = NULL; 1205 ret = 1; 1206 1207 if (0) { 1208 decode_err: 1209 /* wrong packet length */ 1210 al = SSL_AD_DECODE_ERROR; 1211 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1212 fatal_err: 1213 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1214 } 1215 err: 1216 EVP_PKEY_free(pkey); 1217 X509_free(x); 1218 sk_X509_pop_free(sk, X509_free); 1219 1220 return (ret); 1221 } 1222 1223 static int 1224 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1225 { 1226 CBS dhp, dhg, dhpk; 1227 BN_CTX *bn_ctx = NULL; 1228 SESS_CERT *sc = NULL; 1229 DH *dh = NULL; 1230 long alg_a; 1231 int al; 1232 1233 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1234 sc = s->session->sess_cert; 1235 1236 if ((dh = DH_new()) == NULL) { 1237 SSLerror(s, ERR_R_DH_LIB); 1238 goto err; 1239 } 1240 1241 if (!CBS_get_u16_length_prefixed(cbs, &dhp)) 1242 goto decode_err; 1243 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1244 SSLerror(s, ERR_R_BN_LIB); 1245 goto err; 1246 } 1247 1248 if (!CBS_get_u16_length_prefixed(cbs, &dhg)) 1249 goto decode_err; 1250 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1251 SSLerror(s, ERR_R_BN_LIB); 1252 goto err; 1253 } 1254 1255 if (!CBS_get_u16_length_prefixed(cbs, &dhpk)) 1256 goto decode_err; 1257 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1258 NULL)) == NULL) { 1259 SSLerror(s, ERR_R_BN_LIB); 1260 goto err; 1261 } 1262 1263 /* 1264 * Check the strength of the DH key just constructed. 1265 * Discard keys weaker than 1024 bits. 1266 */ 1267 if (DH_size(dh) < 1024 / 8) { 1268 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1269 goto err; 1270 } 1271 1272 if (alg_a & SSL_aRSA) 1273 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1274 else 1275 /* XXX - Anonymous DH, so no certificate or pkey. */ 1276 *pkey = NULL; 1277 1278 sc->peer_dh_tmp = dh; 1279 1280 return (1); 1281 1282 decode_err: 1283 al = SSL_AD_DECODE_ERROR; 1284 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1285 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1286 1287 err: 1288 DH_free(dh); 1289 BN_CTX_free(bn_ctx); 1290 1291 return (-1); 1292 } 1293 1294 static int 1295 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1296 { 1297 EC_KEY *ecdh = NULL; 1298 int ret = -1; 1299 1300 /* Extract the server's ephemeral ECDH public key. */ 1301 if ((ecdh = EC_KEY_new()) == NULL) { 1302 SSLerror(s, ERR_R_MALLOC_FAILURE); 1303 goto err; 1304 } 1305 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh, nid, public)) { 1306 SSLerror(s, SSL_R_BAD_ECPOINT); 1307 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1308 goto err; 1309 } 1310 1311 sc->peer_nid = nid; 1312 sc->peer_ecdh_tmp = ecdh; 1313 ecdh = NULL; 1314 1315 ret = 1; 1316 1317 err: 1318 EC_KEY_free(ecdh); 1319 1320 return (ret); 1321 } 1322 1323 static int 1324 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1325 { 1326 size_t outlen; 1327 1328 if (nid != NID_X25519) { 1329 SSLerror(s, ERR_R_INTERNAL_ERROR); 1330 goto err; 1331 } 1332 1333 if (CBS_len(public) != X25519_KEY_LENGTH) { 1334 SSLerror(s, SSL_R_BAD_ECPOINT); 1335 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1336 goto err; 1337 } 1338 1339 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1340 SSLerror(s, ERR_R_MALLOC_FAILURE); 1341 goto err; 1342 } 1343 1344 return (1); 1345 1346 err: 1347 return (-1); 1348 } 1349 1350 static int 1351 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1352 { 1353 CBS public; 1354 uint8_t curve_type; 1355 uint16_t curve_id; 1356 SESS_CERT *sc; 1357 long alg_a; 1358 int nid; 1359 int al; 1360 1361 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1362 sc = s->session->sess_cert; 1363 1364 /* Only named curves are supported. */ 1365 if (!CBS_get_u8(cbs, &curve_type) || 1366 curve_type != NAMED_CURVE_TYPE || 1367 !CBS_get_u16(cbs, &curve_id)) { 1368 al = SSL_AD_DECODE_ERROR; 1369 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1370 goto fatal_err; 1371 } 1372 1373 /* 1374 * Check that the curve is one of our preferences - if it is not, 1375 * the server has sent us an invalid curve. 1376 */ 1377 if (tls1_check_curve(s, curve_id) != 1) { 1378 al = SSL_AD_DECODE_ERROR; 1379 SSLerror(s, SSL_R_WRONG_CURVE); 1380 goto fatal_err; 1381 } 1382 1383 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1384 al = SSL_AD_INTERNAL_ERROR; 1385 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1386 goto fatal_err; 1387 } 1388 1389 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1390 goto decode_err; 1391 1392 if (nid == NID_X25519) { 1393 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1394 goto err; 1395 } else { 1396 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1397 goto err; 1398 } 1399 1400 /* 1401 * The ECC/TLS specification does not mention the use of DSA to sign 1402 * ECParameters in the server key exchange message. We do support RSA 1403 * and ECDSA. 1404 */ 1405 if (alg_a & SSL_aRSA) 1406 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1407 else if (alg_a & SSL_aECDSA) 1408 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1409 else 1410 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1411 *pkey = NULL; 1412 1413 return (1); 1414 1415 decode_err: 1416 al = SSL_AD_DECODE_ERROR; 1417 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1418 1419 fatal_err: 1420 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1421 1422 err: 1423 return (-1); 1424 } 1425 1426 int 1427 ssl3_get_server_key_exchange(SSL *s) 1428 { 1429 CBS cbs, signature; 1430 EVP_PKEY *pkey = NULL; 1431 EVP_MD_CTX md_ctx; 1432 const unsigned char *param; 1433 size_t param_len; 1434 long alg_k, alg_a; 1435 int al, ret; 1436 1437 EVP_MD_CTX_init(&md_ctx); 1438 1439 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 1440 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1441 1442 /* 1443 * Use same message size as in ssl3_get_certificate_request() 1444 * as ServerKeyExchange message may be skipped. 1445 */ 1446 if ((ret = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1447 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list)) <= 0) 1448 return ret; 1449 1450 if (s->internal->init_num < 0) 1451 goto err; 1452 1453 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 1454 1455 if (S3I(s)->hs.tls12.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1456 /* 1457 * Do not skip server key exchange if this cipher suite uses 1458 * ephemeral keys. 1459 */ 1460 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1461 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1462 al = SSL_AD_UNEXPECTED_MESSAGE; 1463 goto fatal_err; 1464 } 1465 1466 S3I(s)->hs.tls12.reuse_message = 1; 1467 EVP_MD_CTX_cleanup(&md_ctx); 1468 return (1); 1469 } 1470 1471 if (s->session->sess_cert != NULL) { 1472 DH_free(s->session->sess_cert->peer_dh_tmp); 1473 s->session->sess_cert->peer_dh_tmp = NULL; 1474 1475 EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp); 1476 s->session->sess_cert->peer_ecdh_tmp = NULL; 1477 1478 free(s->session->sess_cert->peer_x25519_tmp); 1479 s->session->sess_cert->peer_x25519_tmp = NULL; 1480 } else { 1481 s->session->sess_cert = ssl_sess_cert_new(); 1482 if (s->session->sess_cert == NULL) 1483 goto err; 1484 } 1485 1486 param = CBS_data(&cbs); 1487 param_len = CBS_len(&cbs); 1488 1489 if (alg_k & SSL_kDHE) { 1490 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1) 1491 goto err; 1492 } else if (alg_k & SSL_kECDHE) { 1493 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1) 1494 goto err; 1495 } else if (alg_k != 0) { 1496 al = SSL_AD_UNEXPECTED_MESSAGE; 1497 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1498 goto fatal_err; 1499 } 1500 1501 param_len -= CBS_len(&cbs); 1502 1503 /* if it was signed, check the signature */ 1504 if (pkey != NULL) { 1505 uint16_t sigalg_value = SIGALG_NONE; 1506 const struct ssl_sigalg *sigalg; 1507 EVP_PKEY_CTX *pctx; 1508 1509 if (SSL_USE_SIGALGS(s)) { 1510 if (!CBS_get_u16(&cbs, &sigalg_value)) 1511 goto decode_err; 1512 } 1513 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1514 goto decode_err; 1515 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1516 al = SSL_AD_DECODE_ERROR; 1517 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1518 goto fatal_err; 1519 } 1520 1521 if ((sigalg = ssl_sigalg_for_peer(s, pkey, 1522 sigalg_value)) == NULL) { 1523 al = SSL_AD_DECODE_ERROR; 1524 goto fatal_err; 1525 } 1526 S3I(s)->hs.peer_sigalg = sigalg; 1527 1528 if (!EVP_DigestVerifyInit(&md_ctx, &pctx, sigalg->md(), 1529 NULL, pkey)) 1530 goto err; 1531 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->client_random, 1532 SSL3_RANDOM_SIZE)) 1533 goto err; 1534 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1535 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1536 RSA_PKCS1_PSS_PADDING) || 1537 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1538 goto err; 1539 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->server_random, 1540 SSL3_RANDOM_SIZE)) 1541 goto err; 1542 if (!EVP_DigestVerifyUpdate(&md_ctx, param, param_len)) 1543 goto err; 1544 if (EVP_DigestVerifyFinal(&md_ctx, CBS_data(&signature), 1545 CBS_len(&signature)) <= 0) { 1546 al = SSL_AD_DECRYPT_ERROR; 1547 SSLerror(s, SSL_R_BAD_SIGNATURE); 1548 goto fatal_err; 1549 } 1550 } else { 1551 /* aNULL does not need public keys. */ 1552 if (!(alg_a & SSL_aNULL)) { 1553 SSLerror(s, ERR_R_INTERNAL_ERROR); 1554 goto err; 1555 } 1556 } 1557 1558 if (CBS_len(&cbs) != 0) { 1559 al = SSL_AD_DECODE_ERROR; 1560 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1561 goto fatal_err; 1562 } 1563 1564 EVP_PKEY_free(pkey); 1565 EVP_MD_CTX_cleanup(&md_ctx); 1566 1567 return (1); 1568 1569 decode_err: 1570 al = SSL_AD_DECODE_ERROR; 1571 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1572 1573 fatal_err: 1574 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1575 1576 err: 1577 EVP_PKEY_free(pkey); 1578 EVP_MD_CTX_cleanup(&md_ctx); 1579 1580 return (-1); 1581 } 1582 1583 int 1584 ssl3_get_certificate_request(SSL *s) 1585 { 1586 CBS cert_request, cert_types, rdn_list; 1587 X509_NAME *xn = NULL; 1588 const unsigned char *q; 1589 STACK_OF(X509_NAME) *ca_sk = NULL; 1590 int ret; 1591 1592 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1593 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list)) <= 0) 1594 return ret; 1595 1596 ret = 0; 1597 1598 S3I(s)->hs.tls12.cert_request = 0; 1599 1600 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_DONE) { 1601 S3I(s)->hs.tls12.reuse_message = 1; 1602 /* 1603 * If we get here we don't need any cached handshake records 1604 * as we wont be doing client auth. 1605 */ 1606 tls1_transcript_free(s); 1607 return (1); 1608 } 1609 1610 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1611 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1612 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1613 goto err; 1614 } 1615 1616 /* TLS does not like anon-DH with client cert */ 1617 if (S3I(s)->hs.cipher->algorithm_auth & SSL_aNULL) { 1618 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1619 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1620 goto err; 1621 } 1622 1623 if (s->internal->init_num < 0) 1624 goto decode_err; 1625 CBS_init(&cert_request, s->internal->init_msg, s->internal->init_num); 1626 1627 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1628 SSLerror(s, ERR_R_MALLOC_FAILURE); 1629 goto err; 1630 } 1631 1632 if (!CBS_get_u8_length_prefixed(&cert_request, &cert_types)) 1633 goto decode_err; 1634 1635 if (SSL_USE_SIGALGS(s)) { 1636 CBS sigalgs; 1637 1638 if (CBS_len(&cert_request) < 2) { 1639 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1640 goto err; 1641 } 1642 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1643 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1644 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1645 goto err; 1646 } 1647 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1648 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1649 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1650 goto err; 1651 } 1652 if (!CBS_stow(&sigalgs, &S3I(s)->hs.sigalgs, 1653 &S3I(s)->hs.sigalgs_len)) 1654 goto err; 1655 } 1656 1657 /* get the CA RDNs */ 1658 if (CBS_len(&cert_request) < 2) { 1659 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1660 goto err; 1661 } 1662 1663 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1664 CBS_len(&cert_request) != 0) { 1665 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1666 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1667 goto err; 1668 } 1669 1670 while (CBS_len(&rdn_list) > 0) { 1671 CBS rdn; 1672 1673 if (CBS_len(&rdn_list) < 2) { 1674 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1675 goto err; 1676 } 1677 1678 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1679 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1680 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1681 goto err; 1682 } 1683 1684 q = CBS_data(&rdn); 1685 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1686 ssl3_send_alert(s, SSL3_AL_FATAL, 1687 SSL_AD_DECODE_ERROR); 1688 SSLerror(s, ERR_R_ASN1_LIB); 1689 goto err; 1690 } 1691 1692 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1693 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1694 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1695 goto err; 1696 } 1697 if (!sk_X509_NAME_push(ca_sk, xn)) { 1698 SSLerror(s, ERR_R_MALLOC_FAILURE); 1699 goto err; 1700 } 1701 xn = NULL; /* avoid free in err block */ 1702 } 1703 1704 /* we should setup a certificate to return.... */ 1705 S3I(s)->hs.tls12.cert_request = 1; 1706 sk_X509_NAME_pop_free(S3I(s)->hs.tls12.ca_names, X509_NAME_free); 1707 S3I(s)->hs.tls12.ca_names = ca_sk; 1708 ca_sk = NULL; 1709 1710 ret = 1; 1711 if (0) { 1712 decode_err: 1713 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1714 } 1715 err: 1716 X509_NAME_free(xn); 1717 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1718 return (ret); 1719 } 1720 1721 static int 1722 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1723 { 1724 return (X509_NAME_cmp(*a, *b)); 1725 } 1726 1727 int 1728 ssl3_get_new_session_ticket(SSL *s) 1729 { 1730 uint32_t lifetime_hint; 1731 CBS cbs, session_ticket; 1732 int al, ret; 1733 1734 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1735 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384)) <= 0) 1736 return ret; 1737 1738 ret = 0; 1739 1740 if (S3I(s)->hs.tls12.message_type == SSL3_MT_FINISHED) { 1741 S3I(s)->hs.tls12.reuse_message = 1; 1742 return (1); 1743 } 1744 if (S3I(s)->hs.tls12.message_type != SSL3_MT_NEWSESSION_TICKET) { 1745 al = SSL_AD_UNEXPECTED_MESSAGE; 1746 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1747 goto fatal_err; 1748 } 1749 1750 if (s->internal->init_num < 0) { 1751 al = SSL_AD_DECODE_ERROR; 1752 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1753 goto fatal_err; 1754 } 1755 1756 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 1757 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1758 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1759 CBS_len(&cbs) != 0) { 1760 al = SSL_AD_DECODE_ERROR; 1761 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1762 goto fatal_err; 1763 } 1764 s->session->tlsext_tick_lifetime_hint = lifetime_hint; 1765 1766 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1767 &s->session->tlsext_ticklen)) { 1768 SSLerror(s, ERR_R_MALLOC_FAILURE); 1769 goto err; 1770 } 1771 1772 /* 1773 * There are two ways to detect a resumed ticket sesion. 1774 * One is to set an appropriate session ID and then the server 1775 * must return a match in ServerHello. This allows the normal 1776 * client session ID matching to work and we know much 1777 * earlier that the ticket has been accepted. 1778 * 1779 * The other way is to set zero length session ID when the 1780 * ticket is presented and rely on the handshake to determine 1781 * session resumption. 1782 * 1783 * We choose the former approach because this fits in with 1784 * assumptions elsewhere in OpenSSL. The session ID is set 1785 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1786 * ticket. 1787 */ 1788 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1789 s->session->session_id, &s->session->session_id_length, 1790 EVP_sha256(), NULL); 1791 ret = 1; 1792 return (ret); 1793 fatal_err: 1794 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1795 err: 1796 return (-1); 1797 } 1798 1799 int 1800 ssl3_get_cert_status(SSL *s) 1801 { 1802 CBS cert_status, response; 1803 uint8_t status_type; 1804 int al, ret; 1805 1806 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1807 SSL3_ST_CR_CERT_STATUS_B, -1, 16384)) <= 0) 1808 return ret; 1809 1810 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1811 /* 1812 * Tell the callback the server did not send us an OSCP 1813 * response, and has decided to head directly to key exchange. 1814 */ 1815 if (s->ctx->internal->tlsext_status_cb) { 1816 free(s->internal->tlsext_ocsp_resp); 1817 s->internal->tlsext_ocsp_resp = NULL; 1818 s->internal->tlsext_ocsp_resp_len = 0; 1819 1820 ret = s->ctx->internal->tlsext_status_cb(s, 1821 s->ctx->internal->tlsext_status_arg); 1822 if (ret == 0) { 1823 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1824 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1825 goto fatal_err; 1826 } 1827 if (ret < 0) { 1828 al = SSL_AD_INTERNAL_ERROR; 1829 SSLerror(s, ERR_R_MALLOC_FAILURE); 1830 goto fatal_err; 1831 } 1832 } 1833 S3I(s)->hs.tls12.reuse_message = 1; 1834 return (1); 1835 } 1836 1837 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE && 1838 S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE_STATUS) { 1839 al = SSL_AD_UNEXPECTED_MESSAGE; 1840 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1841 goto fatal_err; 1842 } 1843 1844 if (s->internal->init_num < 0) { 1845 /* need at least status type + length */ 1846 al = SSL_AD_DECODE_ERROR; 1847 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1848 goto fatal_err; 1849 } 1850 1851 CBS_init(&cert_status, s->internal->init_msg, s->internal->init_num); 1852 if (!CBS_get_u8(&cert_status, &status_type) || 1853 CBS_len(&cert_status) < 3) { 1854 /* need at least status type + length */ 1855 al = SSL_AD_DECODE_ERROR; 1856 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1857 goto fatal_err; 1858 } 1859 1860 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1861 al = SSL_AD_DECODE_ERROR; 1862 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1863 goto fatal_err; 1864 } 1865 1866 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1867 CBS_len(&cert_status) != 0) { 1868 al = SSL_AD_DECODE_ERROR; 1869 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1870 goto fatal_err; 1871 } 1872 1873 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1874 &s->internal->tlsext_ocsp_resp_len)) { 1875 al = SSL_AD_INTERNAL_ERROR; 1876 SSLerror(s, ERR_R_MALLOC_FAILURE); 1877 goto fatal_err; 1878 } 1879 1880 if (s->ctx->internal->tlsext_status_cb) { 1881 int ret; 1882 ret = s->ctx->internal->tlsext_status_cb(s, 1883 s->ctx->internal->tlsext_status_arg); 1884 if (ret == 0) { 1885 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1886 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1887 goto fatal_err; 1888 } 1889 if (ret < 0) { 1890 al = SSL_AD_INTERNAL_ERROR; 1891 SSLerror(s, ERR_R_MALLOC_FAILURE); 1892 goto fatal_err; 1893 } 1894 } 1895 return (1); 1896 fatal_err: 1897 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1898 return (-1); 1899 } 1900 1901 int 1902 ssl3_get_server_done(SSL *s) 1903 { 1904 int ret; 1905 1906 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1907 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1908 30 /* should be very small, like 0 :-) */)) <= 0) 1909 return ret; 1910 1911 if (s->internal->init_num != 0) { 1912 /* should contain no data */ 1913 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1914 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1915 return -1; 1916 } 1917 1918 return 1; 1919 } 1920 1921 static int 1922 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1923 { 1924 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1925 unsigned char *enc_pms = NULL; 1926 uint16_t max_legacy_version; 1927 EVP_PKEY *pkey = NULL; 1928 int ret = -1; 1929 int enc_len; 1930 CBB epms; 1931 1932 /* 1933 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1934 */ 1935 1936 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA].x509); 1937 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1938 pkey->pkey.rsa == NULL) { 1939 SSLerror(s, ERR_R_INTERNAL_ERROR); 1940 goto err; 1941 } 1942 1943 /* 1944 * Our maximum legacy protocol version - while RFC 5246 section 7.4.7.1 1945 * says "The latest (newest) version supported by the client", if we're 1946 * doing RSA key exchange then we have to presume that we're talking to 1947 * a server that does not understand the supported versions extension 1948 * and therefore our maximum version is that sent in the ClientHello. 1949 */ 1950 if (!ssl_max_legacy_version(s, &max_legacy_version)) 1951 goto err; 1952 pms[0] = max_legacy_version >> 8; 1953 pms[1] = max_legacy_version & 0xff; 1954 arc4random_buf(&pms[2], sizeof(pms) - 2); 1955 1956 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1957 SSLerror(s, ERR_R_MALLOC_FAILURE); 1958 goto err; 1959 } 1960 1961 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 1962 RSA_PKCS1_PADDING); 1963 if (enc_len <= 0) { 1964 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1965 goto err; 1966 } 1967 1968 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1969 goto err; 1970 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 1971 goto err; 1972 if (!CBB_flush(cbb)) 1973 goto err; 1974 1975 if (!tls12_derive_master_secret(s, pms, sizeof(pms))) 1976 goto err; 1977 1978 ret = 1; 1979 1980 err: 1981 explicit_bzero(pms, sizeof(pms)); 1982 EVP_PKEY_free(pkey); 1983 free(enc_pms); 1984 1985 return (ret); 1986 } 1987 1988 static int 1989 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1990 { 1991 DH *dh_srvr = NULL, *dh_clnt = NULL; 1992 unsigned char *key = NULL; 1993 int key_size = 0, key_len; 1994 unsigned char *data; 1995 int ret = -1; 1996 CBB dh_Yc; 1997 1998 /* Ensure that we have an ephemeral key for DHE. */ 1999 if (sess_cert->peer_dh_tmp == NULL) { 2000 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2001 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 2002 goto err; 2003 } 2004 dh_srvr = sess_cert->peer_dh_tmp; 2005 2006 /* Generate a new random key. */ 2007 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2008 SSLerror(s, ERR_R_DH_LIB); 2009 goto err; 2010 } 2011 if (!DH_generate_key(dh_clnt)) { 2012 SSLerror(s, ERR_R_DH_LIB); 2013 goto err; 2014 } 2015 if ((key_size = DH_size(dh_clnt)) <= 0) { 2016 SSLerror(s, ERR_R_DH_LIB); 2017 goto err; 2018 } 2019 if ((key = malloc(key_size)) == NULL) { 2020 SSLerror(s, ERR_R_MALLOC_FAILURE); 2021 goto err; 2022 } 2023 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) { 2024 SSLerror(s, ERR_R_DH_LIB); 2025 goto err; 2026 } 2027 2028 if (!tls12_derive_master_secret(s, key, key_len)) 2029 goto err; 2030 2031 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2032 goto err; 2033 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2034 goto err; 2035 BN_bn2bin(dh_clnt->pub_key, data); 2036 if (!CBB_flush(cbb)) 2037 goto err; 2038 2039 ret = 1; 2040 2041 err: 2042 DH_free(dh_clnt); 2043 freezero(key, key_size); 2044 2045 return (ret); 2046 } 2047 2048 static int 2049 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2050 { 2051 EC_KEY *ecdh = NULL; 2052 uint8_t *key = NULL; 2053 size_t key_len = 0; 2054 int ret = -1; 2055 CBB ecpoint; 2056 2057 if ((ecdh = EC_KEY_new()) == NULL) { 2058 SSLerror(s, ERR_R_MALLOC_FAILURE); 2059 goto err; 2060 } 2061 2062 if (!ssl_kex_generate_ecdhe_ecp(ecdh, sc->peer_nid)) 2063 goto err; 2064 2065 /* Encode our public key. */ 2066 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2067 goto err; 2068 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 2069 goto err; 2070 if (!CBB_flush(cbb)) 2071 goto err; 2072 2073 if (!ssl_kex_derive_ecdhe_ecp(ecdh, sc->peer_ecdh_tmp, &key, &key_len)) 2074 goto err; 2075 if (!tls12_derive_master_secret(s, key, key_len)) 2076 goto err; 2077 2078 ret = 1; 2079 2080 err: 2081 freezero(key, key_len); 2082 EC_KEY_free(ecdh); 2083 2084 return (ret); 2085 } 2086 2087 static int 2088 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2089 { 2090 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2091 int ret = -1; 2092 CBB ecpoint; 2093 2094 /* Generate X25519 key pair and derive shared key. */ 2095 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2096 goto err; 2097 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2098 goto err; 2099 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2100 goto err; 2101 X25519_keypair(public_key, private_key); 2102 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2103 goto err; 2104 2105 /* Serialize the public key. */ 2106 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2107 goto err; 2108 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2109 goto err; 2110 if (!CBB_flush(cbb)) 2111 goto err; 2112 2113 if (!tls12_derive_master_secret(s, shared_key, X25519_KEY_LENGTH)) 2114 goto err; 2115 2116 ret = 1; 2117 2118 err: 2119 free(public_key); 2120 freezero(private_key, X25519_KEY_LENGTH); 2121 freezero(shared_key, X25519_KEY_LENGTH); 2122 2123 return (ret); 2124 } 2125 2126 static int 2127 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2128 { 2129 if (sc->peer_x25519_tmp != NULL) { 2130 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2131 goto err; 2132 } else if (sc->peer_ecdh_tmp != NULL) { 2133 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2134 goto err; 2135 } else { 2136 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2137 SSLerror(s, ERR_R_INTERNAL_ERROR); 2138 goto err; 2139 } 2140 2141 return (1); 2142 2143 err: 2144 return (-1); 2145 } 2146 2147 static int 2148 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2149 { 2150 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2151 EVP_PKEY *pub_key = NULL; 2152 EVP_PKEY_CTX *pkey_ctx; 2153 X509 *peer_cert; 2154 size_t msglen; 2155 unsigned int md_len; 2156 EVP_MD_CTX *ukm_hash; 2157 int ret = -1; 2158 int nid; 2159 CBB gostblob; 2160 2161 /* Get server sertificate PKEY and create ctx from it */ 2162 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2163 if (peer_cert == NULL) { 2164 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2165 goto err; 2166 } 2167 2168 pub_key = X509_get_pubkey(peer_cert); 2169 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2170 2171 /* 2172 * If we have send a certificate, and certificate key parameters match 2173 * those of server certificate, use certificate key for key exchange. 2174 * Otherwise, generate ephemeral key pair. 2175 */ 2176 EVP_PKEY_encrypt_init(pkey_ctx); 2177 2178 /* Generate session key. */ 2179 arc4random_buf(premaster_secret, 32); 2180 2181 /* 2182 * If we have client certificate, use its secret as peer key. 2183 */ 2184 if (S3I(s)->hs.tls12.cert_request && s->cert->key->privatekey) { 2185 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2186 s->cert->key->privatekey) <=0) { 2187 /* 2188 * If there was an error - just ignore it. 2189 * Ephemeral key would be used. 2190 */ 2191 ERR_clear_error(); 2192 } 2193 } 2194 2195 /* 2196 * Compute shared IV and store it in algorithm-specific context data. 2197 */ 2198 ukm_hash = EVP_MD_CTX_new(); 2199 if (ukm_hash == NULL) { 2200 SSLerror(s, ERR_R_MALLOC_FAILURE); 2201 goto err; 2202 } 2203 2204 /* XXX check handshake hash instead. */ 2205 if (S3I(s)->hs.cipher->algorithm2 & SSL_HANDSHAKE_MAC_GOST94) 2206 nid = NID_id_GostR3411_94; 2207 else 2208 nid = NID_id_tc26_gost3411_2012_256; 2209 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2210 goto err; 2211 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2212 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2213 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2214 EVP_MD_CTX_free(ukm_hash); 2215 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2216 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2217 SSLerror(s, SSL_R_LIBRARY_BUG); 2218 goto err; 2219 } 2220 2221 /* 2222 * Make GOST keytransport blob message, encapsulate it into sequence. 2223 */ 2224 msglen = 255; 2225 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2226 32) < 0) { 2227 SSLerror(s, SSL_R_LIBRARY_BUG); 2228 goto err; 2229 } 2230 2231 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2232 goto err; 2233 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2234 goto err; 2235 if (!CBB_flush(cbb)) 2236 goto err; 2237 2238 /* Check if pubkey from client certificate was used. */ 2239 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2240 NULL) > 0) { 2241 /* Set flag "skip certificate verify". */ 2242 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2243 } 2244 EVP_PKEY_CTX_free(pkey_ctx); 2245 2246 if (!tls12_derive_master_secret(s, premaster_secret, 32)) 2247 goto err; 2248 2249 ret = 1; 2250 2251 err: 2252 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2253 EVP_PKEY_free(pub_key); 2254 2255 return (ret); 2256 } 2257 2258 int 2259 ssl3_send_client_key_exchange(SSL *s) 2260 { 2261 SESS_CERT *sess_cert; 2262 unsigned long alg_k; 2263 CBB cbb, kex; 2264 2265 memset(&cbb, 0, sizeof(cbb)); 2266 2267 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2268 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2269 2270 if ((sess_cert = s->session->sess_cert) == NULL) { 2271 ssl3_send_alert(s, SSL3_AL_FATAL, 2272 SSL_AD_UNEXPECTED_MESSAGE); 2273 SSLerror(s, ERR_R_INTERNAL_ERROR); 2274 goto err; 2275 } 2276 2277 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2278 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2279 goto err; 2280 2281 if (alg_k & SSL_kRSA) { 2282 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2283 goto err; 2284 } else if (alg_k & SSL_kDHE) { 2285 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2286 goto err; 2287 } else if (alg_k & SSL_kECDHE) { 2288 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2289 goto err; 2290 } else if (alg_k & SSL_kGOST) { 2291 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2292 goto err; 2293 } else { 2294 ssl3_send_alert(s, SSL3_AL_FATAL, 2295 SSL_AD_HANDSHAKE_FAILURE); 2296 SSLerror(s, ERR_R_INTERNAL_ERROR); 2297 goto err; 2298 } 2299 2300 if (!ssl3_handshake_msg_finish(s, &cbb)) 2301 goto err; 2302 2303 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2304 } 2305 2306 /* SSL3_ST_CW_KEY_EXCH_B */ 2307 return (ssl3_handshake_write(s)); 2308 2309 err: 2310 CBB_cleanup(&cbb); 2311 2312 return (-1); 2313 } 2314 2315 static int 2316 ssl3_send_client_verify_sigalgs(SSL *s, EVP_PKEY *pkey, 2317 const struct ssl_sigalg *sigalg, CBB *cert_verify) 2318 { 2319 CBB cbb_signature; 2320 EVP_PKEY_CTX *pctx = NULL; 2321 EVP_MD_CTX mctx; 2322 const unsigned char *hdata; 2323 unsigned char *signature = NULL; 2324 size_t signature_len, hdata_len; 2325 int ret = 0; 2326 2327 EVP_MD_CTX_init(&mctx); 2328 2329 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2330 SSLerror(s, ERR_R_INTERNAL_ERROR); 2331 goto err; 2332 } 2333 if (!EVP_DigestSignInit(&mctx, &pctx, sigalg->md(), NULL, pkey)) { 2334 SSLerror(s, ERR_R_EVP_LIB); 2335 goto err; 2336 } 2337 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2338 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2339 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2340 SSLerror(s, ERR_R_EVP_LIB); 2341 goto err; 2342 } 2343 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2344 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2345 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2346 SSLerror(s, ERR_R_EVP_LIB); 2347 goto err; 2348 } 2349 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2350 SSLerror(s, ERR_R_EVP_LIB); 2351 goto err; 2352 } 2353 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2354 signature_len == 0) { 2355 SSLerror(s, ERR_R_EVP_LIB); 2356 goto err; 2357 } 2358 if ((signature = calloc(1, signature_len)) == NULL) { 2359 SSLerror(s, ERR_R_MALLOC_FAILURE); 2360 goto err; 2361 } 2362 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2363 SSLerror(s, ERR_R_EVP_LIB); 2364 goto err; 2365 } 2366 2367 if (!CBB_add_u16(cert_verify, sigalg->value)) 2368 goto err; 2369 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2370 goto err; 2371 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2372 goto err; 2373 if (!CBB_flush(cert_verify)) 2374 goto err; 2375 2376 ret = 1; 2377 2378 err: 2379 EVP_MD_CTX_cleanup(&mctx); 2380 free(signature); 2381 return ret; 2382 } 2383 2384 static int 2385 ssl3_send_client_verify_rsa(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2386 { 2387 CBB cbb_signature; 2388 unsigned char data[EVP_MAX_MD_SIZE]; 2389 unsigned char *signature = NULL; 2390 unsigned int signature_len; 2391 size_t data_len; 2392 int ret = 0; 2393 2394 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2395 goto err; 2396 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2397 goto err; 2398 if (RSA_sign(NID_md5_sha1, data, data_len, signature, 2399 &signature_len, pkey->pkey.rsa) <= 0 ) { 2400 SSLerror(s, ERR_R_RSA_LIB); 2401 goto err; 2402 } 2403 2404 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2405 goto err; 2406 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2407 goto err; 2408 if (!CBB_flush(cert_verify)) 2409 goto err; 2410 2411 ret = 1; 2412 err: 2413 free(signature); 2414 return ret; 2415 } 2416 2417 static int 2418 ssl3_send_client_verify_ec(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2419 { 2420 CBB cbb_signature; 2421 unsigned char data[EVP_MAX_MD_SIZE]; 2422 unsigned char *signature = NULL; 2423 unsigned int signature_len; 2424 int ret = 0; 2425 2426 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2427 goto err; 2428 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2429 goto err; 2430 if (!ECDSA_sign(0, &data[MD5_DIGEST_LENGTH], SHA_DIGEST_LENGTH, 2431 signature, &signature_len, pkey->pkey.ec)) { 2432 SSLerror(s, ERR_R_ECDSA_LIB); 2433 goto err; 2434 } 2435 2436 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2437 goto err; 2438 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2439 goto err; 2440 if (!CBB_flush(cert_verify)) 2441 goto err; 2442 2443 ret = 1; 2444 err: 2445 free(signature); 2446 return ret; 2447 } 2448 2449 #ifndef OPENSSL_NO_GOST 2450 static int 2451 ssl3_send_client_verify_gost(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2452 { 2453 CBB cbb_signature; 2454 EVP_MD_CTX mctx; 2455 EVP_PKEY_CTX *pctx; 2456 const EVP_MD *md; 2457 const unsigned char *hdata; 2458 unsigned char *signature = NULL; 2459 size_t signature_len; 2460 size_t hdata_len; 2461 int nid; 2462 int ret = 0; 2463 2464 EVP_MD_CTX_init(&mctx); 2465 2466 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2467 SSLerror(s, ERR_R_INTERNAL_ERROR); 2468 goto err; 2469 } 2470 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2471 (md = EVP_get_digestbynid(nid)) == NULL) { 2472 SSLerror(s, ERR_R_EVP_LIB); 2473 goto err; 2474 } 2475 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2476 SSLerror(s, ERR_R_EVP_LIB); 2477 goto err; 2478 } 2479 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2480 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2481 SSLerror(s, ERR_R_EVP_LIB); 2482 goto err; 2483 } 2484 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2485 SSLerror(s, ERR_R_EVP_LIB); 2486 goto err; 2487 } 2488 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2489 signature_len == 0) { 2490 SSLerror(s, ERR_R_EVP_LIB); 2491 goto err; 2492 } 2493 if ((signature = calloc(1, signature_len)) == NULL) { 2494 SSLerror(s, ERR_R_MALLOC_FAILURE); 2495 goto err; 2496 } 2497 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2498 SSLerror(s, ERR_R_EVP_LIB); 2499 goto err; 2500 } 2501 2502 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2503 goto err; 2504 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2505 goto err; 2506 if (!CBB_flush(cert_verify)) 2507 goto err; 2508 2509 ret = 1; 2510 err: 2511 EVP_MD_CTX_cleanup(&mctx); 2512 free(signature); 2513 return ret; 2514 } 2515 #endif 2516 2517 int 2518 ssl3_send_client_verify(SSL *s) 2519 { 2520 const struct ssl_sigalg *sigalg; 2521 CBB cbb, cert_verify; 2522 EVP_PKEY *pkey; 2523 2524 memset(&cbb, 0, sizeof(cbb)); 2525 2526 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2527 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2528 SSL3_MT_CERTIFICATE_VERIFY)) 2529 goto err; 2530 2531 pkey = s->cert->key->privatekey; 2532 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2533 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2534 goto err; 2535 } 2536 S3I(s)->hs.our_sigalg = sigalg; 2537 2538 /* 2539 * For TLS v1.2 send signature algorithm and signature using 2540 * agreed digest and cached handshake records. 2541 */ 2542 if (SSL_USE_SIGALGS(s)) { 2543 if (!ssl3_send_client_verify_sigalgs(s, pkey, sigalg, 2544 &cert_verify)) 2545 goto err; 2546 } else if (pkey->type == EVP_PKEY_RSA) { 2547 if (!ssl3_send_client_verify_rsa(s, pkey, &cert_verify)) 2548 goto err; 2549 } else if (pkey->type == EVP_PKEY_EC) { 2550 if (!ssl3_send_client_verify_ec(s, pkey, &cert_verify)) 2551 goto err; 2552 #ifndef OPENSSL_NO_GOST 2553 } else if (pkey->type == NID_id_GostR3410_94 || 2554 pkey->type == NID_id_GostR3410_2001) { 2555 if (!ssl3_send_client_verify_gost(s, pkey, &cert_verify)) 2556 goto err; 2557 #endif 2558 } else { 2559 SSLerror(s, ERR_R_INTERNAL_ERROR); 2560 goto err; 2561 } 2562 2563 tls1_transcript_free(s); 2564 2565 if (!ssl3_handshake_msg_finish(s, &cbb)) 2566 goto err; 2567 2568 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2569 } 2570 2571 return (ssl3_handshake_write(s)); 2572 2573 err: 2574 CBB_cleanup(&cbb); 2575 2576 return (-1); 2577 } 2578 2579 int 2580 ssl3_send_client_certificate(SSL *s) 2581 { 2582 EVP_PKEY *pkey = NULL; 2583 X509 *x509 = NULL; 2584 CBB cbb, client_cert; 2585 int i; 2586 2587 memset(&cbb, 0, sizeof(cbb)); 2588 2589 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2590 if (s->cert->key->x509 == NULL || 2591 s->cert->key->privatekey == NULL) 2592 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2593 else 2594 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2595 } 2596 2597 /* We need to get a client cert */ 2598 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2599 /* 2600 * If we get an error, we need to 2601 * ssl->internal->rwstate = SSL_X509_LOOKUP; return(-1); 2602 * We then get retried later. 2603 */ 2604 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2605 if (i < 0) { 2606 s->internal->rwstate = SSL_X509_LOOKUP; 2607 return (-1); 2608 } 2609 s->internal->rwstate = SSL_NOTHING; 2610 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2611 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2612 if (!SSL_use_certificate(s, x509) || 2613 !SSL_use_PrivateKey(s, pkey)) 2614 i = 0; 2615 } else if (i == 1) { 2616 i = 0; 2617 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2618 } 2619 2620 X509_free(x509); 2621 EVP_PKEY_free(pkey); 2622 if (i == 0) { 2623 S3I(s)->hs.tls12.cert_request = 2; 2624 2625 /* There is no client certificate to verify. */ 2626 tls1_transcript_free(s); 2627 } 2628 2629 /* Ok, we have a cert */ 2630 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2631 } 2632 2633 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2634 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2635 SSL3_MT_CERTIFICATE)) 2636 goto err; 2637 if (!ssl3_output_cert_chain(s, &client_cert, 2638 (S3I(s)->hs.tls12.cert_request == 2) ? NULL : s->cert->key)) 2639 goto err; 2640 if (!ssl3_handshake_msg_finish(s, &cbb)) 2641 goto err; 2642 2643 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2644 } 2645 2646 /* SSL3_ST_CW_CERT_D */ 2647 return (ssl3_handshake_write(s)); 2648 2649 err: 2650 CBB_cleanup(&cbb); 2651 2652 return (0); 2653 } 2654 2655 #define has_bits(i,m) (((i)&(m)) == (m)) 2656 2657 int 2658 ssl3_check_cert_and_algorithm(SSL *s) 2659 { 2660 int i, idx; 2661 long alg_k, alg_a; 2662 EVP_PKEY *pkey = NULL; 2663 SESS_CERT *sc; 2664 DH *dh; 2665 2666 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2667 alg_a = S3I(s)->hs.cipher->algorithm_auth; 2668 2669 /* We don't have a certificate. */ 2670 if (alg_a & SSL_aNULL) 2671 return (1); 2672 2673 sc = s->session->sess_cert; 2674 if (sc == NULL) { 2675 SSLerror(s, ERR_R_INTERNAL_ERROR); 2676 goto err; 2677 } 2678 dh = s->session->sess_cert->peer_dh_tmp; 2679 2680 /* This is the passed certificate. */ 2681 2682 idx = sc->peer_cert_type; 2683 if (idx == SSL_PKEY_ECC) { 2684 if (ssl_check_srvr_ecc_cert_and_alg( 2685 sc->peer_pkeys[idx].x509, s) == 0) { 2686 /* check failed */ 2687 SSLerror(s, SSL_R_BAD_ECC_CERT); 2688 goto fatal_err; 2689 } else { 2690 return (1); 2691 } 2692 } 2693 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2694 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2695 EVP_PKEY_free(pkey); 2696 2697 /* Check that we have a certificate if we require one. */ 2698 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2699 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2700 goto fatal_err; 2701 } 2702 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2703 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2704 goto fatal_err; 2705 } 2706 if ((alg_k & SSL_kDHE) && 2707 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2708 SSLerror(s, SSL_R_MISSING_DH_KEY); 2709 goto fatal_err; 2710 } 2711 2712 return (1); 2713 fatal_err: 2714 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2715 err: 2716 return (0); 2717 } 2718 2719 /* 2720 * Check to see if handshake is full or resumed. Usually this is just a 2721 * case of checking to see if a cache hit has occurred. In the case of 2722 * session tickets we have to check the next message to be sure. 2723 */ 2724 2725 int 2726 ssl3_check_finished(SSL *s) 2727 { 2728 int ret; 2729 2730 /* If we have no ticket it cannot be a resumed session. */ 2731 if (!s->session->tlsext_tick) 2732 return (1); 2733 /* this function is called when we really expect a Certificate 2734 * message, so permit appropriate message length */ 2735 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2736 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list)) <= 0) 2737 return ret; 2738 2739 S3I(s)->hs.tls12.reuse_message = 1; 2740 if ((S3I(s)->hs.tls12.message_type == SSL3_MT_FINISHED) || 2741 (S3I(s)->hs.tls12.message_type == SSL3_MT_NEWSESSION_TICKET)) 2742 return (2); 2743 2744 return (1); 2745 } 2746 2747 int 2748 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2749 { 2750 int i = 0; 2751 2752 #ifndef OPENSSL_NO_ENGINE 2753 if (s->ctx->internal->client_cert_engine) { 2754 i = ENGINE_load_ssl_client_cert( 2755 s->ctx->internal->client_cert_engine, s, 2756 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2757 if (i != 0) 2758 return (i); 2759 } 2760 #endif 2761 if (s->ctx->internal->client_cert_cb) 2762 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2763 return (i); 2764 } 2765