1 /* $OpenBSD: ssl_clnt.c,v 1.111 2021/09/03 13:18:17 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 if (CBS_len(&cbs) != 0) 1069 goto decode_err; 1070 1071 /* 1072 * Determine if we need to see RI. Strictly speaking if we want to 1073 * avoid an attack we should *always* see RI even on initial server 1074 * hello because the client doesn't see any renegotiation during an 1075 * attack. However this would mean we could not connect to any server 1076 * which doesn't support RI so for the immediate future tolerate RI 1077 * absence on initial connect only. 1078 */ 1079 if (!S3I(s)->renegotiate_seen && 1080 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1081 al = SSL_AD_HANDSHAKE_FAILURE; 1082 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1083 goto fatal_err; 1084 } 1085 1086 if (ssl_check_serverhello_tlsext(s) <= 0) { 1087 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1088 goto err; 1089 } 1090 1091 return (1); 1092 1093 decode_err: 1094 /* wrong packet length */ 1095 al = SSL_AD_DECODE_ERROR; 1096 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1097 fatal_err: 1098 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1099 err: 1100 return (-1); 1101 } 1102 1103 int 1104 ssl3_get_server_certificate(SSL *s) 1105 { 1106 int al, i, ok, ret = -1; 1107 long n; 1108 CBS cbs, cert_list; 1109 X509 *x = NULL; 1110 const unsigned char *q; 1111 STACK_OF(X509) *sk = NULL; 1112 SESS_CERT *sc; 1113 EVP_PKEY *pkey = NULL; 1114 1115 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1116 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 1117 if (!ok) 1118 return ((int)n); 1119 1120 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1121 S3I(s)->hs.tls12.reuse_message = 1; 1122 return (1); 1123 } 1124 1125 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE) { 1126 al = SSL_AD_UNEXPECTED_MESSAGE; 1127 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1128 goto fatal_err; 1129 } 1130 1131 1132 if ((sk = sk_X509_new_null()) == NULL) { 1133 SSLerror(s, ERR_R_MALLOC_FAILURE); 1134 goto err; 1135 } 1136 1137 if (n < 0) 1138 goto decode_err; 1139 1140 CBS_init(&cbs, s->internal->init_msg, n); 1141 if (CBS_len(&cbs) < 3) 1142 goto decode_err; 1143 1144 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1145 CBS_len(&cbs) != 0) { 1146 al = SSL_AD_DECODE_ERROR; 1147 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1148 goto fatal_err; 1149 } 1150 1151 while (CBS_len(&cert_list) > 0) { 1152 CBS cert; 1153 1154 if (CBS_len(&cert_list) < 3) 1155 goto decode_err; 1156 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1157 al = SSL_AD_DECODE_ERROR; 1158 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1159 goto fatal_err; 1160 } 1161 1162 q = CBS_data(&cert); 1163 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1164 if (x == NULL) { 1165 al = SSL_AD_BAD_CERTIFICATE; 1166 SSLerror(s, ERR_R_ASN1_LIB); 1167 goto fatal_err; 1168 } 1169 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1170 al = SSL_AD_DECODE_ERROR; 1171 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1172 goto fatal_err; 1173 } 1174 if (!sk_X509_push(sk, x)) { 1175 SSLerror(s, ERR_R_MALLOC_FAILURE); 1176 goto err; 1177 } 1178 x = NULL; 1179 } 1180 1181 i = ssl_verify_cert_chain(s, sk); 1182 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1183 al = ssl_verify_alarm_type(s->verify_result); 1184 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1185 goto fatal_err; 1186 1187 } 1188 ERR_clear_error(); /* but we keep s->verify_result */ 1189 1190 sc = ssl_sess_cert_new(); 1191 if (sc == NULL) 1192 goto err; 1193 ssl_sess_cert_free(SSI(s)->sess_cert); 1194 SSI(s)->sess_cert = sc; 1195 1196 sc->cert_chain = sk; 1197 /* 1198 * Inconsistency alert: cert_chain does include the peer's 1199 * certificate, which we don't include in s3_srvr.c 1200 */ 1201 x = sk_X509_value(sk, 0); 1202 sk = NULL; 1203 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1204 1205 pkey = X509_get_pubkey(x); 1206 1207 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1208 x = NULL; 1209 al = SSL3_AL_FATAL; 1210 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1211 goto fatal_err; 1212 } 1213 1214 i = ssl_cert_type(x, pkey); 1215 if (i < 0) { 1216 x = NULL; 1217 al = SSL3_AL_FATAL; 1218 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1219 goto fatal_err; 1220 } 1221 1222 sc->peer_cert_type = i; 1223 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1224 /* 1225 * Why would the following ever happen? 1226 * We just created sc a couple of lines ago. 1227 */ 1228 X509_free(sc->peer_pkeys[i].x509); 1229 sc->peer_pkeys[i].x509 = x; 1230 sc->peer_key = &(sc->peer_pkeys[i]); 1231 1232 X509_free(s->session->peer); 1233 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1234 s->session->peer = x; 1235 s->session->verify_result = s->verify_result; 1236 1237 x = NULL; 1238 ret = 1; 1239 1240 if (0) { 1241 decode_err: 1242 /* wrong packet length */ 1243 al = SSL_AD_DECODE_ERROR; 1244 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1245 fatal_err: 1246 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1247 } 1248 err: 1249 EVP_PKEY_free(pkey); 1250 X509_free(x); 1251 sk_X509_pop_free(sk, X509_free); 1252 1253 return (ret); 1254 } 1255 1256 static int 1257 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1258 { 1259 CBS dhp, dhg, dhpk; 1260 BN_CTX *bn_ctx = NULL; 1261 SESS_CERT *sc = NULL; 1262 DH *dh = NULL; 1263 long alg_a; 1264 int al; 1265 1266 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1267 sc = SSI(s)->sess_cert; 1268 1269 if ((dh = DH_new()) == NULL) { 1270 SSLerror(s, ERR_R_DH_LIB); 1271 goto err; 1272 } 1273 1274 if (!CBS_get_u16_length_prefixed(cbs, &dhp)) 1275 goto decode_err; 1276 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1277 SSLerror(s, ERR_R_BN_LIB); 1278 goto err; 1279 } 1280 1281 if (!CBS_get_u16_length_prefixed(cbs, &dhg)) 1282 goto decode_err; 1283 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1284 SSLerror(s, ERR_R_BN_LIB); 1285 goto err; 1286 } 1287 1288 if (!CBS_get_u16_length_prefixed(cbs, &dhpk)) 1289 goto decode_err; 1290 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1291 NULL)) == NULL) { 1292 SSLerror(s, ERR_R_BN_LIB); 1293 goto err; 1294 } 1295 1296 /* 1297 * Check the strength of the DH key just constructed. 1298 * Discard keys weaker than 1024 bits. 1299 */ 1300 if (DH_size(dh) < 1024 / 8) { 1301 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1302 goto err; 1303 } 1304 1305 if (alg_a & SSL_aRSA) 1306 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1307 else 1308 /* XXX - Anonymous DH, so no certificate or pkey. */ 1309 *pkey = NULL; 1310 1311 sc->peer_dh_tmp = dh; 1312 1313 return (1); 1314 1315 decode_err: 1316 al = SSL_AD_DECODE_ERROR; 1317 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1318 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1319 1320 err: 1321 DH_free(dh); 1322 BN_CTX_free(bn_ctx); 1323 1324 return (-1); 1325 } 1326 1327 static int 1328 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1329 { 1330 EC_KEY *ecdh = NULL; 1331 int ret = -1; 1332 1333 /* Extract the server's ephemeral ECDH public key. */ 1334 if ((ecdh = EC_KEY_new()) == NULL) { 1335 SSLerror(s, ERR_R_MALLOC_FAILURE); 1336 goto err; 1337 } 1338 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh, nid, public)) { 1339 SSLerror(s, SSL_R_BAD_ECPOINT); 1340 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1341 goto err; 1342 } 1343 1344 sc->peer_nid = nid; 1345 sc->peer_ecdh_tmp = ecdh; 1346 ecdh = NULL; 1347 1348 ret = 1; 1349 1350 err: 1351 EC_KEY_free(ecdh); 1352 1353 return (ret); 1354 } 1355 1356 static int 1357 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1358 { 1359 size_t outlen; 1360 1361 if (nid != NID_X25519) { 1362 SSLerror(s, ERR_R_INTERNAL_ERROR); 1363 goto err; 1364 } 1365 1366 if (CBS_len(public) != X25519_KEY_LENGTH) { 1367 SSLerror(s, SSL_R_BAD_ECPOINT); 1368 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1369 goto err; 1370 } 1371 1372 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1373 SSLerror(s, ERR_R_MALLOC_FAILURE); 1374 goto err; 1375 } 1376 1377 return (1); 1378 1379 err: 1380 return (-1); 1381 } 1382 1383 static int 1384 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1385 { 1386 CBS public; 1387 uint8_t curve_type; 1388 uint16_t curve_id; 1389 SESS_CERT *sc; 1390 long alg_a; 1391 int nid; 1392 int al; 1393 1394 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1395 sc = SSI(s)->sess_cert; 1396 1397 /* Only named curves are supported. */ 1398 if (!CBS_get_u8(cbs, &curve_type) || 1399 curve_type != NAMED_CURVE_TYPE || 1400 !CBS_get_u16(cbs, &curve_id)) { 1401 al = SSL_AD_DECODE_ERROR; 1402 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1403 goto fatal_err; 1404 } 1405 1406 /* 1407 * Check that the curve is one of our preferences - if it is not, 1408 * the server has sent us an invalid curve. 1409 */ 1410 if (tls1_check_curve(s, curve_id) != 1) { 1411 al = SSL_AD_DECODE_ERROR; 1412 SSLerror(s, SSL_R_WRONG_CURVE); 1413 goto fatal_err; 1414 } 1415 1416 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1417 al = SSL_AD_INTERNAL_ERROR; 1418 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1419 goto fatal_err; 1420 } 1421 1422 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1423 goto decode_err; 1424 1425 if (nid == NID_X25519) { 1426 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1427 goto err; 1428 } else { 1429 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1430 goto err; 1431 } 1432 1433 /* 1434 * The ECC/TLS specification does not mention the use of DSA to sign 1435 * ECParameters in the server key exchange message. We do support RSA 1436 * and ECDSA. 1437 */ 1438 if (alg_a & SSL_aRSA) 1439 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1440 else if (alg_a & SSL_aECDSA) 1441 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1442 else 1443 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1444 *pkey = NULL; 1445 1446 return (1); 1447 1448 decode_err: 1449 al = SSL_AD_DECODE_ERROR; 1450 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1451 1452 fatal_err: 1453 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1454 1455 err: 1456 return (-1); 1457 } 1458 1459 int 1460 ssl3_get_server_key_exchange(SSL *s) 1461 { 1462 CBS cbs, signature; 1463 EVP_PKEY *pkey = NULL; 1464 EVP_MD_CTX md_ctx; 1465 const unsigned char *param; 1466 long n, alg_k, alg_a; 1467 int al, ok; 1468 size_t param_len; 1469 1470 EVP_MD_CTX_init(&md_ctx); 1471 1472 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 1473 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1474 1475 /* 1476 * Use same message size as in ssl3_get_certificate_request() 1477 * as ServerKeyExchange message may be skipped. 1478 */ 1479 n = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1480 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1481 if (!ok) 1482 return ((int)n); 1483 1484 if (n < 0) 1485 goto err; 1486 1487 CBS_init(&cbs, s->internal->init_msg, n); 1488 1489 if (S3I(s)->hs.tls12.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1490 /* 1491 * Do not skip server key exchange if this cipher suite uses 1492 * ephemeral keys. 1493 */ 1494 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1495 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1496 al = SSL_AD_UNEXPECTED_MESSAGE; 1497 goto fatal_err; 1498 } 1499 1500 S3I(s)->hs.tls12.reuse_message = 1; 1501 EVP_MD_CTX_cleanup(&md_ctx); 1502 return (1); 1503 } 1504 1505 if (SSI(s)->sess_cert != NULL) { 1506 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1507 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1508 1509 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1510 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1511 1512 free(SSI(s)->sess_cert->peer_x25519_tmp); 1513 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1514 } else { 1515 SSI(s)->sess_cert = ssl_sess_cert_new(); 1516 if (SSI(s)->sess_cert == NULL) 1517 goto err; 1518 } 1519 1520 param = CBS_data(&cbs); 1521 param_len = CBS_len(&cbs); 1522 1523 if (alg_k & SSL_kDHE) { 1524 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1) 1525 goto err; 1526 } else if (alg_k & SSL_kECDHE) { 1527 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1) 1528 goto err; 1529 } else if (alg_k != 0) { 1530 al = SSL_AD_UNEXPECTED_MESSAGE; 1531 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1532 goto fatal_err; 1533 } 1534 1535 param_len -= CBS_len(&cbs); 1536 1537 /* if it was signed, check the signature */ 1538 if (pkey != NULL) { 1539 uint16_t sigalg_value = SIGALG_NONE; 1540 const struct ssl_sigalg *sigalg; 1541 EVP_PKEY_CTX *pctx; 1542 1543 if (SSL_USE_SIGALGS(s)) { 1544 if (!CBS_get_u16(&cbs, &sigalg_value)) 1545 goto decode_err; 1546 } 1547 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1548 goto decode_err; 1549 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1550 al = SSL_AD_DECODE_ERROR; 1551 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1552 goto fatal_err; 1553 } 1554 1555 if ((sigalg = ssl_sigalg_for_peer(s, pkey, 1556 sigalg_value)) == NULL) { 1557 al = SSL_AD_DECODE_ERROR; 1558 goto fatal_err; 1559 } 1560 S3I(s)->hs.peer_sigalg = sigalg; 1561 1562 if (!EVP_DigestVerifyInit(&md_ctx, &pctx, sigalg->md(), 1563 NULL, pkey)) 1564 goto err; 1565 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->client_random, 1566 SSL3_RANDOM_SIZE)) 1567 goto err; 1568 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1569 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1570 RSA_PKCS1_PSS_PADDING) || 1571 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1572 goto err; 1573 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->server_random, 1574 SSL3_RANDOM_SIZE)) 1575 goto err; 1576 if (!EVP_DigestVerifyUpdate(&md_ctx, param, param_len)) 1577 goto err; 1578 if (EVP_DigestVerifyFinal(&md_ctx, CBS_data(&signature), 1579 CBS_len(&signature)) <= 0) { 1580 al = SSL_AD_DECRYPT_ERROR; 1581 SSLerror(s, SSL_R_BAD_SIGNATURE); 1582 goto fatal_err; 1583 } 1584 } else { 1585 /* aNULL does not need public keys. */ 1586 if (!(alg_a & SSL_aNULL)) { 1587 SSLerror(s, ERR_R_INTERNAL_ERROR); 1588 goto err; 1589 } 1590 } 1591 1592 if (CBS_len(&cbs) != 0) { 1593 al = SSL_AD_DECODE_ERROR; 1594 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1595 goto fatal_err; 1596 } 1597 1598 EVP_PKEY_free(pkey); 1599 EVP_MD_CTX_cleanup(&md_ctx); 1600 1601 return (1); 1602 1603 decode_err: 1604 al = SSL_AD_DECODE_ERROR; 1605 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1606 1607 fatal_err: 1608 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1609 1610 err: 1611 EVP_PKEY_free(pkey); 1612 EVP_MD_CTX_cleanup(&md_ctx); 1613 1614 return (-1); 1615 } 1616 1617 int 1618 ssl3_get_certificate_request(SSL *s) 1619 { 1620 int ok, ret = 0; 1621 long n; 1622 CBS cert_request, cert_types, rdn_list; 1623 X509_NAME *xn = NULL; 1624 const unsigned char *q; 1625 STACK_OF(X509_NAME) *ca_sk = NULL; 1626 1627 n = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1628 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1629 if (!ok) 1630 return ((int)n); 1631 1632 S3I(s)->hs.tls12.cert_request = 0; 1633 1634 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_DONE) { 1635 S3I(s)->hs.tls12.reuse_message = 1; 1636 /* 1637 * If we get here we don't need any cached handshake records 1638 * as we wont be doing client auth. 1639 */ 1640 tls1_transcript_free(s); 1641 return (1); 1642 } 1643 1644 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1645 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1646 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1647 goto err; 1648 } 1649 1650 /* TLS does not like anon-DH with client cert */ 1651 if (S3I(s)->hs.cipher->algorithm_auth & SSL_aNULL) { 1652 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1653 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1654 goto err; 1655 } 1656 1657 if (n < 0) 1658 goto decode_err; 1659 CBS_init(&cert_request, s->internal->init_msg, n); 1660 1661 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1662 SSLerror(s, ERR_R_MALLOC_FAILURE); 1663 goto err; 1664 } 1665 1666 if (!CBS_get_u8_length_prefixed(&cert_request, &cert_types)) 1667 goto decode_err; 1668 1669 if (SSL_USE_SIGALGS(s)) { 1670 CBS sigalgs; 1671 1672 if (CBS_len(&cert_request) < 2) { 1673 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1674 goto err; 1675 } 1676 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1677 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1678 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1679 goto err; 1680 } 1681 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1682 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1683 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1684 goto err; 1685 } 1686 if (!CBS_stow(&sigalgs, &S3I(s)->hs.sigalgs, 1687 &S3I(s)->hs.sigalgs_len)) 1688 goto err; 1689 } 1690 1691 /* get the CA RDNs */ 1692 if (CBS_len(&cert_request) < 2) { 1693 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1694 goto err; 1695 } 1696 1697 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1698 CBS_len(&cert_request) != 0) { 1699 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1700 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1701 goto err; 1702 } 1703 1704 while (CBS_len(&rdn_list) > 0) { 1705 CBS rdn; 1706 1707 if (CBS_len(&rdn_list) < 2) { 1708 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1709 goto err; 1710 } 1711 1712 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1713 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1714 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1715 goto err; 1716 } 1717 1718 q = CBS_data(&rdn); 1719 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1720 ssl3_send_alert(s, SSL3_AL_FATAL, 1721 SSL_AD_DECODE_ERROR); 1722 SSLerror(s, ERR_R_ASN1_LIB); 1723 goto err; 1724 } 1725 1726 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1727 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1728 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1729 goto err; 1730 } 1731 if (!sk_X509_NAME_push(ca_sk, xn)) { 1732 SSLerror(s, ERR_R_MALLOC_FAILURE); 1733 goto err; 1734 } 1735 xn = NULL; /* avoid free in err block */ 1736 } 1737 1738 /* we should setup a certificate to return.... */ 1739 S3I(s)->hs.tls12.cert_request = 1; 1740 sk_X509_NAME_pop_free(S3I(s)->hs.tls12.ca_names, X509_NAME_free); 1741 S3I(s)->hs.tls12.ca_names = ca_sk; 1742 ca_sk = NULL; 1743 1744 ret = 1; 1745 if (0) { 1746 decode_err: 1747 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1748 } 1749 err: 1750 X509_NAME_free(xn); 1751 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1752 return (ret); 1753 } 1754 1755 static int 1756 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1757 { 1758 return (X509_NAME_cmp(*a, *b)); 1759 } 1760 1761 int 1762 ssl3_get_new_session_ticket(SSL *s) 1763 { 1764 int ok, al, ret = 0; 1765 uint32_t lifetime_hint; 1766 long n; 1767 CBS cbs, session_ticket; 1768 1769 n = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1770 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1771 if (!ok) 1772 return ((int)n); 1773 1774 if (S3I(s)->hs.tls12.message_type == SSL3_MT_FINISHED) { 1775 S3I(s)->hs.tls12.reuse_message = 1; 1776 return (1); 1777 } 1778 if (S3I(s)->hs.tls12.message_type != SSL3_MT_NEWSESSION_TICKET) { 1779 al = SSL_AD_UNEXPECTED_MESSAGE; 1780 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1781 goto fatal_err; 1782 } 1783 1784 if (n < 0) { 1785 al = SSL_AD_DECODE_ERROR; 1786 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1787 goto fatal_err; 1788 } 1789 1790 CBS_init(&cbs, s->internal->init_msg, n); 1791 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1792 #if UINT32_MAX > LONG_MAX 1793 lifetime_hint > LONG_MAX || 1794 #endif 1795 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1796 CBS_len(&cbs) != 0) { 1797 al = SSL_AD_DECODE_ERROR; 1798 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1799 goto fatal_err; 1800 } 1801 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1802 1803 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1804 &s->session->tlsext_ticklen)) { 1805 SSLerror(s, ERR_R_MALLOC_FAILURE); 1806 goto err; 1807 } 1808 1809 /* 1810 * There are two ways to detect a resumed ticket sesion. 1811 * One is to set an appropriate session ID and then the server 1812 * must return a match in ServerHello. This allows the normal 1813 * client session ID matching to work and we know much 1814 * earlier that the ticket has been accepted. 1815 * 1816 * The other way is to set zero length session ID when the 1817 * ticket is presented and rely on the handshake to determine 1818 * session resumption. 1819 * 1820 * We choose the former approach because this fits in with 1821 * assumptions elsewhere in OpenSSL. The session ID is set 1822 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1823 * ticket. 1824 */ 1825 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1826 s->session->session_id, &s->session->session_id_length, 1827 EVP_sha256(), NULL); 1828 ret = 1; 1829 return (ret); 1830 fatal_err: 1831 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1832 err: 1833 return (-1); 1834 } 1835 1836 int 1837 ssl3_get_cert_status(SSL *s) 1838 { 1839 CBS cert_status, response; 1840 int ok, al; 1841 long n; 1842 uint8_t status_type; 1843 1844 n = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1845 SSL3_ST_CR_CERT_STATUS_B, -1, 16384, &ok); 1846 if (!ok) 1847 return ((int)n); 1848 1849 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1850 /* 1851 * Tell the callback the server did not send us an OSCP 1852 * response, and has decided to head directly to key exchange. 1853 */ 1854 if (s->ctx->internal->tlsext_status_cb) { 1855 int ret; 1856 1857 free(s->internal->tlsext_ocsp_resp); 1858 s->internal->tlsext_ocsp_resp = NULL; 1859 s->internal->tlsext_ocsp_resp_len = 0; 1860 1861 ret = s->ctx->internal->tlsext_status_cb(s, 1862 s->ctx->internal->tlsext_status_arg); 1863 if (ret == 0) { 1864 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1865 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1866 goto fatal_err; 1867 } 1868 if (ret < 0) { 1869 al = SSL_AD_INTERNAL_ERROR; 1870 SSLerror(s, ERR_R_MALLOC_FAILURE); 1871 goto fatal_err; 1872 } 1873 } 1874 S3I(s)->hs.tls12.reuse_message = 1; 1875 return (1); 1876 } 1877 1878 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE && 1879 S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE_STATUS) { 1880 al = SSL_AD_UNEXPECTED_MESSAGE; 1881 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1882 goto fatal_err; 1883 } 1884 1885 if (n < 0) { 1886 /* need at least status type + length */ 1887 al = SSL_AD_DECODE_ERROR; 1888 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1889 goto fatal_err; 1890 } 1891 1892 CBS_init(&cert_status, s->internal->init_msg, n); 1893 if (!CBS_get_u8(&cert_status, &status_type) || 1894 CBS_len(&cert_status) < 3) { 1895 /* need at least status type + length */ 1896 al = SSL_AD_DECODE_ERROR; 1897 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1898 goto fatal_err; 1899 } 1900 1901 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1902 al = SSL_AD_DECODE_ERROR; 1903 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1904 goto fatal_err; 1905 } 1906 1907 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1908 CBS_len(&cert_status) != 0) { 1909 al = SSL_AD_DECODE_ERROR; 1910 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1911 goto fatal_err; 1912 } 1913 1914 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1915 &s->internal->tlsext_ocsp_resp_len)) { 1916 al = SSL_AD_INTERNAL_ERROR; 1917 SSLerror(s, ERR_R_MALLOC_FAILURE); 1918 goto fatal_err; 1919 } 1920 1921 if (s->ctx->internal->tlsext_status_cb) { 1922 int ret; 1923 ret = s->ctx->internal->tlsext_status_cb(s, 1924 s->ctx->internal->tlsext_status_arg); 1925 if (ret == 0) { 1926 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1927 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1928 goto fatal_err; 1929 } 1930 if (ret < 0) { 1931 al = SSL_AD_INTERNAL_ERROR; 1932 SSLerror(s, ERR_R_MALLOC_FAILURE); 1933 goto fatal_err; 1934 } 1935 } 1936 return (1); 1937 fatal_err: 1938 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1939 return (-1); 1940 } 1941 1942 int 1943 ssl3_get_server_done(SSL *s) 1944 { 1945 int ok, ret = 0; 1946 long n; 1947 1948 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1949 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1950 30, /* should be very small, like 0 :-) */ &ok); 1951 if (!ok) 1952 return ((int)n); 1953 1954 if (n > 0) { 1955 /* should contain no data */ 1956 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1957 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1958 return (-1); 1959 } 1960 ret = 1; 1961 return (ret); 1962 } 1963 1964 static int 1965 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1966 { 1967 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1968 unsigned char *enc_pms = NULL; 1969 EVP_PKEY *pkey = NULL; 1970 int ret = -1; 1971 int enc_len; 1972 CBB epms; 1973 1974 /* 1975 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1976 */ 1977 1978 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA].x509); 1979 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1980 pkey->pkey.rsa == NULL) { 1981 SSLerror(s, ERR_R_INTERNAL_ERROR); 1982 goto err; 1983 } 1984 1985 /* XXX - our max protocol version. */ 1986 pms[0] = s->client_version >> 8; 1987 pms[1] = s->client_version & 0xff; 1988 arc4random_buf(&pms[2], sizeof(pms) - 2); 1989 1990 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1991 SSLerror(s, ERR_R_MALLOC_FAILURE); 1992 goto err; 1993 } 1994 1995 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 1996 RSA_PKCS1_PADDING); 1997 if (enc_len <= 0) { 1998 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1999 goto err; 2000 } 2001 2002 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 2003 goto err; 2004 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 2005 goto err; 2006 if (!CBB_flush(cbb)) 2007 goto err; 2008 2009 if (!tls12_derive_master_secret(s, pms, sizeof(pms))) 2010 goto err; 2011 2012 ret = 1; 2013 2014 err: 2015 explicit_bzero(pms, sizeof(pms)); 2016 EVP_PKEY_free(pkey); 2017 free(enc_pms); 2018 2019 return (ret); 2020 } 2021 2022 static int 2023 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2024 { 2025 DH *dh_srvr = NULL, *dh_clnt = NULL; 2026 unsigned char *key = NULL; 2027 int key_size = 0, key_len; 2028 unsigned char *data; 2029 int ret = -1; 2030 CBB dh_Yc; 2031 2032 /* Ensure that we have an ephemeral key for DHE. */ 2033 if (sess_cert->peer_dh_tmp == NULL) { 2034 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2035 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 2036 goto err; 2037 } 2038 dh_srvr = sess_cert->peer_dh_tmp; 2039 2040 /* Generate a new random key. */ 2041 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2042 SSLerror(s, ERR_R_DH_LIB); 2043 goto err; 2044 } 2045 if (!DH_generate_key(dh_clnt)) { 2046 SSLerror(s, ERR_R_DH_LIB); 2047 goto err; 2048 } 2049 if ((key_size = DH_size(dh_clnt)) <= 0) { 2050 SSLerror(s, ERR_R_DH_LIB); 2051 goto err; 2052 } 2053 if ((key = malloc(key_size)) == NULL) { 2054 SSLerror(s, ERR_R_MALLOC_FAILURE); 2055 goto err; 2056 } 2057 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) { 2058 SSLerror(s, ERR_R_DH_LIB); 2059 goto err; 2060 } 2061 2062 if (!tls12_derive_master_secret(s, key, key_len)) 2063 goto err; 2064 2065 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2066 goto err; 2067 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2068 goto err; 2069 BN_bn2bin(dh_clnt->pub_key, data); 2070 if (!CBB_flush(cbb)) 2071 goto err; 2072 2073 ret = 1; 2074 2075 err: 2076 DH_free(dh_clnt); 2077 freezero(key, key_size); 2078 2079 return (ret); 2080 } 2081 2082 static int 2083 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2084 { 2085 EC_KEY *ecdh = NULL; 2086 uint8_t *key = NULL; 2087 size_t key_len = 0; 2088 int ret = -1; 2089 CBB ecpoint; 2090 2091 if ((ecdh = EC_KEY_new()) == NULL) { 2092 SSLerror(s, ERR_R_MALLOC_FAILURE); 2093 goto err; 2094 } 2095 2096 if (!ssl_kex_generate_ecdhe_ecp(ecdh, sc->peer_nid)) 2097 goto err; 2098 2099 /* Encode our public key. */ 2100 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2101 goto err; 2102 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 2103 goto err; 2104 if (!CBB_flush(cbb)) 2105 goto err; 2106 2107 if (!ssl_kex_derive_ecdhe_ecp(ecdh, sc->peer_ecdh_tmp, &key, &key_len)) 2108 goto err; 2109 if (!tls12_derive_master_secret(s, key, key_len)) 2110 goto err; 2111 2112 ret = 1; 2113 2114 err: 2115 freezero(key, key_len); 2116 EC_KEY_free(ecdh); 2117 2118 return (ret); 2119 } 2120 2121 static int 2122 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2123 { 2124 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2125 int ret = -1; 2126 CBB ecpoint; 2127 2128 /* Generate X25519 key pair and derive shared key. */ 2129 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2130 goto err; 2131 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2132 goto err; 2133 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2134 goto err; 2135 X25519_keypair(public_key, private_key); 2136 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2137 goto err; 2138 2139 /* Serialize the public key. */ 2140 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2141 goto err; 2142 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2143 goto err; 2144 if (!CBB_flush(cbb)) 2145 goto err; 2146 2147 if (!tls12_derive_master_secret(s, shared_key, X25519_KEY_LENGTH)) 2148 goto err; 2149 2150 ret = 1; 2151 2152 err: 2153 free(public_key); 2154 freezero(private_key, X25519_KEY_LENGTH); 2155 freezero(shared_key, X25519_KEY_LENGTH); 2156 2157 return (ret); 2158 } 2159 2160 static int 2161 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2162 { 2163 if (sc->peer_x25519_tmp != NULL) { 2164 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2165 goto err; 2166 } else if (sc->peer_ecdh_tmp != NULL) { 2167 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2168 goto err; 2169 } else { 2170 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2171 SSLerror(s, ERR_R_INTERNAL_ERROR); 2172 goto err; 2173 } 2174 2175 return (1); 2176 2177 err: 2178 return (-1); 2179 } 2180 2181 static int 2182 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2183 { 2184 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2185 EVP_PKEY *pub_key = NULL; 2186 EVP_PKEY_CTX *pkey_ctx; 2187 X509 *peer_cert; 2188 size_t msglen; 2189 unsigned int md_len; 2190 EVP_MD_CTX *ukm_hash; 2191 int ret = -1; 2192 int nid; 2193 CBB gostblob; 2194 2195 /* Get server sertificate PKEY and create ctx from it */ 2196 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2197 if (peer_cert == NULL) { 2198 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2199 goto err; 2200 } 2201 2202 pub_key = X509_get_pubkey(peer_cert); 2203 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2204 2205 /* 2206 * If we have send a certificate, and certificate key parameters match 2207 * those of server certificate, use certificate key for key exchange. 2208 * Otherwise, generate ephemeral key pair. 2209 */ 2210 EVP_PKEY_encrypt_init(pkey_ctx); 2211 2212 /* Generate session key. */ 2213 arc4random_buf(premaster_secret, 32); 2214 2215 /* 2216 * If we have client certificate, use its secret as peer key. 2217 */ 2218 if (S3I(s)->hs.tls12.cert_request && s->cert->key->privatekey) { 2219 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2220 s->cert->key->privatekey) <=0) { 2221 /* 2222 * If there was an error - just ignore it. 2223 * Ephemeral key would be used. 2224 */ 2225 ERR_clear_error(); 2226 } 2227 } 2228 2229 /* 2230 * Compute shared IV and store it in algorithm-specific context data. 2231 */ 2232 ukm_hash = EVP_MD_CTX_new(); 2233 if (ukm_hash == NULL) { 2234 SSLerror(s, ERR_R_MALLOC_FAILURE); 2235 goto err; 2236 } 2237 2238 /* XXX check handshake hash instead. */ 2239 if (S3I(s)->hs.cipher->algorithm2 & SSL_HANDSHAKE_MAC_GOST94) 2240 nid = NID_id_GostR3411_94; 2241 else 2242 nid = NID_id_tc26_gost3411_2012_256; 2243 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2244 goto err; 2245 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2246 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2247 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2248 EVP_MD_CTX_free(ukm_hash); 2249 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2250 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2251 SSLerror(s, SSL_R_LIBRARY_BUG); 2252 goto err; 2253 } 2254 2255 /* 2256 * Make GOST keytransport blob message, encapsulate it into sequence. 2257 */ 2258 msglen = 255; 2259 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2260 32) < 0) { 2261 SSLerror(s, SSL_R_LIBRARY_BUG); 2262 goto err; 2263 } 2264 2265 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2266 goto err; 2267 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2268 goto err; 2269 if (!CBB_flush(cbb)) 2270 goto err; 2271 2272 /* Check if pubkey from client certificate was used. */ 2273 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2274 NULL) > 0) { 2275 /* Set flag "skip certificate verify". */ 2276 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2277 } 2278 EVP_PKEY_CTX_free(pkey_ctx); 2279 2280 if (!tls12_derive_master_secret(s, premaster_secret, 32)) 2281 goto err; 2282 2283 ret = 1; 2284 2285 err: 2286 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2287 EVP_PKEY_free(pub_key); 2288 2289 return (ret); 2290 } 2291 2292 int 2293 ssl3_send_client_key_exchange(SSL *s) 2294 { 2295 SESS_CERT *sess_cert; 2296 unsigned long alg_k; 2297 CBB cbb, kex; 2298 2299 memset(&cbb, 0, sizeof(cbb)); 2300 2301 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2302 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2303 2304 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2305 ssl3_send_alert(s, SSL3_AL_FATAL, 2306 SSL_AD_UNEXPECTED_MESSAGE); 2307 SSLerror(s, ERR_R_INTERNAL_ERROR); 2308 goto err; 2309 } 2310 2311 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2312 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2313 goto err; 2314 2315 if (alg_k & SSL_kRSA) { 2316 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2317 goto err; 2318 } else if (alg_k & SSL_kDHE) { 2319 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2320 goto err; 2321 } else if (alg_k & SSL_kECDHE) { 2322 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2323 goto err; 2324 } else if (alg_k & SSL_kGOST) { 2325 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2326 goto err; 2327 } else { 2328 ssl3_send_alert(s, SSL3_AL_FATAL, 2329 SSL_AD_HANDSHAKE_FAILURE); 2330 SSLerror(s, ERR_R_INTERNAL_ERROR); 2331 goto err; 2332 } 2333 2334 if (!ssl3_handshake_msg_finish(s, &cbb)) 2335 goto err; 2336 2337 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2338 } 2339 2340 /* SSL3_ST_CW_KEY_EXCH_B */ 2341 return (ssl3_handshake_write(s)); 2342 2343 err: 2344 CBB_cleanup(&cbb); 2345 2346 return (-1); 2347 } 2348 2349 static int 2350 ssl3_send_client_verify_sigalgs(SSL *s, EVP_PKEY *pkey, 2351 const struct ssl_sigalg *sigalg, CBB *cert_verify) 2352 { 2353 CBB cbb_signature; 2354 EVP_PKEY_CTX *pctx = NULL; 2355 EVP_MD_CTX mctx; 2356 const unsigned char *hdata; 2357 unsigned char *signature = NULL; 2358 size_t signature_len, hdata_len; 2359 int ret = 0; 2360 2361 EVP_MD_CTX_init(&mctx); 2362 2363 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2364 SSLerror(s, ERR_R_INTERNAL_ERROR); 2365 goto err; 2366 } 2367 if (!EVP_DigestSignInit(&mctx, &pctx, sigalg->md(), NULL, pkey)) { 2368 SSLerror(s, ERR_R_EVP_LIB); 2369 goto err; 2370 } 2371 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2372 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2373 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2374 SSLerror(s, ERR_R_EVP_LIB); 2375 goto err; 2376 } 2377 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2378 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2379 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2380 SSLerror(s, ERR_R_EVP_LIB); 2381 goto err; 2382 } 2383 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2384 SSLerror(s, ERR_R_EVP_LIB); 2385 goto err; 2386 } 2387 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2388 signature_len == 0) { 2389 SSLerror(s, ERR_R_EVP_LIB); 2390 goto err; 2391 } 2392 if ((signature = calloc(1, signature_len)) == NULL) { 2393 SSLerror(s, ERR_R_MALLOC_FAILURE); 2394 goto err; 2395 } 2396 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2397 SSLerror(s, ERR_R_EVP_LIB); 2398 goto err; 2399 } 2400 2401 if (!CBB_add_u16(cert_verify, sigalg->value)) 2402 goto err; 2403 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2404 goto err; 2405 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2406 goto err; 2407 if (!CBB_flush(cert_verify)) 2408 goto err; 2409 2410 ret = 1; 2411 2412 err: 2413 EVP_MD_CTX_cleanup(&mctx); 2414 free(signature); 2415 return ret; 2416 } 2417 2418 static int 2419 ssl3_send_client_verify_rsa(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2420 { 2421 CBB cbb_signature; 2422 unsigned char data[EVP_MAX_MD_SIZE]; 2423 unsigned char *signature = NULL; 2424 unsigned int signature_len; 2425 size_t data_len; 2426 int ret = 0; 2427 2428 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2429 goto err; 2430 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2431 goto err; 2432 if (RSA_sign(NID_md5_sha1, data, data_len, signature, 2433 &signature_len, pkey->pkey.rsa) <= 0 ) { 2434 SSLerror(s, ERR_R_RSA_LIB); 2435 goto err; 2436 } 2437 2438 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2439 goto err; 2440 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2441 goto err; 2442 if (!CBB_flush(cert_verify)) 2443 goto err; 2444 2445 ret = 1; 2446 err: 2447 free(signature); 2448 return ret; 2449 } 2450 2451 static int 2452 ssl3_send_client_verify_ec(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2453 { 2454 CBB cbb_signature; 2455 unsigned char data[EVP_MAX_MD_SIZE]; 2456 unsigned char *signature = NULL; 2457 unsigned int signature_len; 2458 int ret = 0; 2459 2460 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2461 goto err; 2462 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2463 goto err; 2464 if (!ECDSA_sign(pkey->save_type, &data[MD5_DIGEST_LENGTH], 2465 SHA_DIGEST_LENGTH, signature, &signature_len, pkey->pkey.ec)) { 2466 SSLerror(s, ERR_R_ECDSA_LIB); 2467 goto err; 2468 } 2469 2470 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2471 goto err; 2472 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2473 goto err; 2474 if (!CBB_flush(cert_verify)) 2475 goto err; 2476 2477 ret = 1; 2478 err: 2479 free(signature); 2480 return ret; 2481 } 2482 2483 #ifndef OPENSSL_NO_GOST 2484 static int 2485 ssl3_send_client_verify_gost(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2486 { 2487 CBB cbb_signature; 2488 EVP_MD_CTX mctx; 2489 EVP_PKEY_CTX *pctx; 2490 const EVP_MD *md; 2491 const unsigned char *hdata; 2492 unsigned char *signature = NULL; 2493 size_t signature_len; 2494 size_t hdata_len; 2495 int nid; 2496 int ret = 0; 2497 2498 EVP_MD_CTX_init(&mctx); 2499 2500 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2501 SSLerror(s, ERR_R_INTERNAL_ERROR); 2502 goto err; 2503 } 2504 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2505 (md = EVP_get_digestbynid(nid)) == NULL) { 2506 SSLerror(s, ERR_R_EVP_LIB); 2507 goto err; 2508 } 2509 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2510 SSLerror(s, ERR_R_EVP_LIB); 2511 goto err; 2512 } 2513 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2514 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2515 SSLerror(s, ERR_R_EVP_LIB); 2516 goto err; 2517 } 2518 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2519 SSLerror(s, ERR_R_EVP_LIB); 2520 goto err; 2521 } 2522 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2523 signature_len == 0) { 2524 SSLerror(s, ERR_R_EVP_LIB); 2525 goto err; 2526 } 2527 if ((signature = calloc(1, signature_len)) == NULL) { 2528 SSLerror(s, ERR_R_MALLOC_FAILURE); 2529 goto err; 2530 } 2531 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2532 SSLerror(s, ERR_R_EVP_LIB); 2533 goto err; 2534 } 2535 2536 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2537 goto err; 2538 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2539 goto err; 2540 if (!CBB_flush(cert_verify)) 2541 goto err; 2542 2543 ret = 1; 2544 err: 2545 EVP_MD_CTX_cleanup(&mctx); 2546 free(signature); 2547 return ret; 2548 } 2549 #endif 2550 2551 int 2552 ssl3_send_client_verify(SSL *s) 2553 { 2554 const struct ssl_sigalg *sigalg; 2555 CBB cbb, cert_verify; 2556 EVP_PKEY *pkey; 2557 2558 memset(&cbb, 0, sizeof(cbb)); 2559 2560 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2561 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2562 SSL3_MT_CERTIFICATE_VERIFY)) 2563 goto err; 2564 2565 pkey = s->cert->key->privatekey; 2566 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2567 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2568 goto err; 2569 } 2570 S3I(s)->hs.our_sigalg = sigalg; 2571 2572 /* 2573 * For TLS v1.2 send signature algorithm and signature using 2574 * agreed digest and cached handshake records. 2575 */ 2576 if (SSL_USE_SIGALGS(s)) { 2577 if (!ssl3_send_client_verify_sigalgs(s, pkey, sigalg, 2578 &cert_verify)) 2579 goto err; 2580 } else if (pkey->type == EVP_PKEY_RSA) { 2581 if (!ssl3_send_client_verify_rsa(s, pkey, &cert_verify)) 2582 goto err; 2583 } else if (pkey->type == EVP_PKEY_EC) { 2584 if (!ssl3_send_client_verify_ec(s, pkey, &cert_verify)) 2585 goto err; 2586 #ifndef OPENSSL_NO_GOST 2587 } else if (pkey->type == NID_id_GostR3410_94 || 2588 pkey->type == NID_id_GostR3410_2001) { 2589 if (!ssl3_send_client_verify_gost(s, pkey, &cert_verify)) 2590 goto err; 2591 #endif 2592 } else { 2593 SSLerror(s, ERR_R_INTERNAL_ERROR); 2594 goto err; 2595 } 2596 2597 tls1_transcript_free(s); 2598 2599 if (!ssl3_handshake_msg_finish(s, &cbb)) 2600 goto err; 2601 2602 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2603 } 2604 2605 return (ssl3_handshake_write(s)); 2606 2607 err: 2608 CBB_cleanup(&cbb); 2609 2610 return (-1); 2611 } 2612 2613 int 2614 ssl3_send_client_certificate(SSL *s) 2615 { 2616 EVP_PKEY *pkey = NULL; 2617 X509 *x509 = NULL; 2618 CBB cbb, client_cert; 2619 int i; 2620 2621 memset(&cbb, 0, sizeof(cbb)); 2622 2623 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2624 if (s->cert->key->x509 == NULL || 2625 s->cert->key->privatekey == NULL) 2626 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2627 else 2628 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2629 } 2630 2631 /* We need to get a client cert */ 2632 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2633 /* 2634 * If we get an error, we need to 2635 * ssl->internal->rwstate = SSL_X509_LOOKUP; return(-1); 2636 * We then get retried later. 2637 */ 2638 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2639 if (i < 0) { 2640 s->internal->rwstate = SSL_X509_LOOKUP; 2641 return (-1); 2642 } 2643 s->internal->rwstate = SSL_NOTHING; 2644 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2645 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2646 if (!SSL_use_certificate(s, x509) || 2647 !SSL_use_PrivateKey(s, pkey)) 2648 i = 0; 2649 } else if (i == 1) { 2650 i = 0; 2651 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2652 } 2653 2654 X509_free(x509); 2655 EVP_PKEY_free(pkey); 2656 if (i == 0) { 2657 S3I(s)->hs.tls12.cert_request = 2; 2658 2659 /* There is no client certificate to verify. */ 2660 tls1_transcript_free(s); 2661 } 2662 2663 /* Ok, we have a cert */ 2664 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2665 } 2666 2667 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2668 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2669 SSL3_MT_CERTIFICATE)) 2670 goto err; 2671 if (!ssl3_output_cert_chain(s, &client_cert, 2672 (S3I(s)->hs.tls12.cert_request == 2) ? NULL : s->cert->key)) 2673 goto err; 2674 if (!ssl3_handshake_msg_finish(s, &cbb)) 2675 goto err; 2676 2677 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2678 } 2679 2680 /* SSL3_ST_CW_CERT_D */ 2681 return (ssl3_handshake_write(s)); 2682 2683 err: 2684 CBB_cleanup(&cbb); 2685 2686 return (0); 2687 } 2688 2689 #define has_bits(i,m) (((i)&(m)) == (m)) 2690 2691 int 2692 ssl3_check_cert_and_algorithm(SSL *s) 2693 { 2694 int i, idx; 2695 long alg_k, alg_a; 2696 EVP_PKEY *pkey = NULL; 2697 SESS_CERT *sc; 2698 DH *dh; 2699 2700 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2701 alg_a = S3I(s)->hs.cipher->algorithm_auth; 2702 2703 /* We don't have a certificate. */ 2704 if (alg_a & SSL_aNULL) 2705 return (1); 2706 2707 sc = SSI(s)->sess_cert; 2708 if (sc == NULL) { 2709 SSLerror(s, ERR_R_INTERNAL_ERROR); 2710 goto err; 2711 } 2712 dh = SSI(s)->sess_cert->peer_dh_tmp; 2713 2714 /* This is the passed certificate. */ 2715 2716 idx = sc->peer_cert_type; 2717 if (idx == SSL_PKEY_ECC) { 2718 if (ssl_check_srvr_ecc_cert_and_alg( 2719 sc->peer_pkeys[idx].x509, s) == 0) { 2720 /* check failed */ 2721 SSLerror(s, SSL_R_BAD_ECC_CERT); 2722 goto fatal_err; 2723 } else { 2724 return (1); 2725 } 2726 } 2727 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2728 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2729 EVP_PKEY_free(pkey); 2730 2731 /* Check that we have a certificate if we require one. */ 2732 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2733 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2734 goto fatal_err; 2735 } 2736 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2737 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2738 goto fatal_err; 2739 } 2740 if ((alg_k & SSL_kDHE) && 2741 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2742 SSLerror(s, SSL_R_MISSING_DH_KEY); 2743 goto fatal_err; 2744 } 2745 2746 return (1); 2747 fatal_err: 2748 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2749 err: 2750 return (0); 2751 } 2752 2753 /* 2754 * Check to see if handshake is full or resumed. Usually this is just a 2755 * case of checking to see if a cache hit has occurred. In the case of 2756 * session tickets we have to check the next message to be sure. 2757 */ 2758 2759 int 2760 ssl3_check_finished(SSL *s) 2761 { 2762 int ok; 2763 long n; 2764 2765 /* If we have no ticket it cannot be a resumed session. */ 2766 if (!s->session->tlsext_tick) 2767 return (1); 2768 /* this function is called when we really expect a Certificate 2769 * message, so permit appropriate message length */ 2770 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2771 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2772 if (!ok) 2773 return ((int)n); 2774 2775 S3I(s)->hs.tls12.reuse_message = 1; 2776 if ((S3I(s)->hs.tls12.message_type == SSL3_MT_FINISHED) || 2777 (S3I(s)->hs.tls12.message_type == SSL3_MT_NEWSESSION_TICKET)) 2778 return (2); 2779 2780 return (1); 2781 } 2782 2783 int 2784 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2785 { 2786 int i = 0; 2787 2788 #ifndef OPENSSL_NO_ENGINE 2789 if (s->ctx->internal->client_cert_engine) { 2790 i = ENGINE_load_ssl_client_cert( 2791 s->ctx->internal->client_cert_engine, s, 2792 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2793 if (i != 0) 2794 return (i); 2795 } 2796 #endif 2797 if (s->ctx->internal->client_cert_cb) 2798 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2799 return (i); 2800 } 2801