1 /* $OpenBSD: ssl_clnt.c,v 1.107 2021/06/30 09:59:07 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 void (*cb)(const SSL *ssl, int type, int val) = NULL; 183 int ret = -1; 184 int new_state, state, skip = 0; 185 186 ERR_clear_error(); 187 errno = 0; 188 189 if (s->internal->info_callback != NULL) 190 cb = s->internal->info_callback; 191 else if (s->ctx->internal->info_callback != NULL) 192 cb = s->ctx->internal->info_callback; 193 194 s->internal->in_handshake++; 195 if (!SSL_in_init(s) || SSL_in_before(s)) 196 SSL_clear(s); 197 198 for (;;) { 199 state = S3I(s)->hs.state; 200 201 switch (S3I(s)->hs.state) { 202 case SSL_ST_RENEGOTIATE: 203 s->internal->renegotiate = 1; 204 S3I(s)->hs.state = SSL_ST_CONNECT; 205 s->ctx->internal->stats.sess_connect_renegotiate++; 206 /* break */ 207 case SSL_ST_BEFORE: 208 case SSL_ST_CONNECT: 209 case SSL_ST_BEFORE|SSL_ST_CONNECT: 210 case SSL_ST_OK|SSL_ST_CONNECT: 211 212 s->server = 0; 213 if (cb != NULL) 214 cb(s, SSL_CB_HANDSHAKE_START, 1); 215 216 if (!ssl_legacy_stack_version(s, s->version)) { 217 SSLerror(s, ERR_R_INTERNAL_ERROR); 218 ret = -1; 219 goto end; 220 } 221 222 if (!ssl_supported_tls_version_range(s, 223 &S3I(s)->hs.our_min_tls_version, 224 &S3I(s)->hs.our_max_tls_version)) { 225 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 226 ret = -1; 227 goto end; 228 } 229 230 if (!ssl3_setup_init_buffer(s)) { 231 ret = -1; 232 goto end; 233 } 234 if (!ssl3_setup_buffers(s)) { 235 ret = -1; 236 goto end; 237 } 238 if (!ssl_init_wbio_buffer(s, 0)) { 239 ret = -1; 240 goto end; 241 } 242 243 /* don't push the buffering BIO quite yet */ 244 245 if (!tls1_transcript_init(s)) { 246 ret = -1; 247 goto end; 248 } 249 250 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 251 s->ctx->internal->stats.sess_connect++; 252 s->internal->init_num = 0; 253 254 if (SSL_is_dtls(s)) { 255 /* mark client_random uninitialized */ 256 memset(s->s3->client_random, 0, 257 sizeof(s->s3->client_random)); 258 D1I(s)->send_cookie = 0; 259 s->internal->hit = 0; 260 } 261 break; 262 263 case SSL3_ST_CW_CLNT_HELLO_A: 264 case SSL3_ST_CW_CLNT_HELLO_B: 265 s->internal->shutdown = 0; 266 267 if (SSL_is_dtls(s)) { 268 /* every DTLS ClientHello resets Finished MAC */ 269 tls1_transcript_reset(s); 270 271 dtls1_start_timer(s); 272 } 273 274 ret = ssl3_send_client_hello(s); 275 if (ret <= 0) 276 goto end; 277 278 if (SSL_is_dtls(s) && D1I(s)->send_cookie) { 279 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 280 S3I(s)->hs.tls12.next_state = SSL3_ST_CR_SRVR_HELLO_A; 281 } else 282 S3I(s)->hs.state = SSL3_ST_CR_SRVR_HELLO_A; 283 284 s->internal->init_num = 0; 285 286 /* turn on buffering for the next lot of output */ 287 if (s->bbio != s->wbio) 288 s->wbio = BIO_push(s->bbio, s->wbio); 289 290 break; 291 292 case SSL3_ST_CR_SRVR_HELLO_A: 293 case SSL3_ST_CR_SRVR_HELLO_B: 294 ret = ssl3_get_server_hello(s); 295 if (ret <= 0) 296 goto end; 297 298 if (s->internal->hit) { 299 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 300 if (!SSL_is_dtls(s)) { 301 if (s->internal->tlsext_ticket_expected) { 302 /* receive renewed session ticket */ 303 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 304 } 305 306 /* No client certificate verification. */ 307 tls1_transcript_free(s); 308 } 309 } else if (SSL_is_dtls(s)) { 310 S3I(s)->hs.state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 311 } else { 312 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 313 } 314 s->internal->init_num = 0; 315 break; 316 317 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 318 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 319 ret = ssl3_get_dtls_hello_verify(s); 320 if (ret <= 0) 321 goto end; 322 dtls1_stop_timer(s); 323 if (D1I(s)->send_cookie) /* start again, with a cookie */ 324 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 325 else 326 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 327 s->internal->init_num = 0; 328 break; 329 330 case SSL3_ST_CR_CERT_A: 331 case SSL3_ST_CR_CERT_B: 332 ret = ssl3_check_finished(s); 333 if (ret <= 0) 334 goto end; 335 if (ret == 2) { 336 s->internal->hit = 1; 337 if (s->internal->tlsext_ticket_expected) 338 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 339 else 340 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 341 s->internal->init_num = 0; 342 break; 343 } 344 /* Check if it is anon DH/ECDH. */ 345 if (!(S3I(s)->hs.cipher->algorithm_auth & 346 SSL_aNULL)) { 347 ret = ssl3_get_server_certificate(s); 348 if (ret <= 0) 349 goto end; 350 if (s->internal->tlsext_status_expected) 351 S3I(s)->hs.state = SSL3_ST_CR_CERT_STATUS_A; 352 else 353 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 354 } else { 355 skip = 1; 356 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 357 } 358 s->internal->init_num = 0; 359 break; 360 361 case SSL3_ST_CR_KEY_EXCH_A: 362 case SSL3_ST_CR_KEY_EXCH_B: 363 ret = ssl3_get_server_key_exchange(s); 364 if (ret <= 0) 365 goto end; 366 S3I(s)->hs.state = SSL3_ST_CR_CERT_REQ_A; 367 s->internal->init_num = 0; 368 369 /* 370 * At this point we check that we have the 371 * required stuff from the server. 372 */ 373 if (!ssl3_check_cert_and_algorithm(s)) { 374 ret = -1; 375 goto end; 376 } 377 break; 378 379 case SSL3_ST_CR_CERT_REQ_A: 380 case SSL3_ST_CR_CERT_REQ_B: 381 ret = ssl3_get_certificate_request(s); 382 if (ret <= 0) 383 goto end; 384 S3I(s)->hs.state = SSL3_ST_CR_SRVR_DONE_A; 385 s->internal->init_num = 0; 386 break; 387 388 case SSL3_ST_CR_SRVR_DONE_A: 389 case SSL3_ST_CR_SRVR_DONE_B: 390 ret = ssl3_get_server_done(s); 391 if (ret <= 0) 392 goto end; 393 if (SSL_is_dtls(s)) 394 dtls1_stop_timer(s); 395 if (S3I(s)->hs.tls12.cert_request) 396 S3I(s)->hs.state = SSL3_ST_CW_CERT_A; 397 else 398 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 399 s->internal->init_num = 0; 400 401 break; 402 403 case SSL3_ST_CW_CERT_A: 404 case SSL3_ST_CW_CERT_B: 405 case SSL3_ST_CW_CERT_C: 406 case SSL3_ST_CW_CERT_D: 407 if (SSL_is_dtls(s)) 408 dtls1_start_timer(s); 409 ret = ssl3_send_client_certificate(s); 410 if (ret <= 0) 411 goto end; 412 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 413 s->internal->init_num = 0; 414 break; 415 416 case SSL3_ST_CW_KEY_EXCH_A: 417 case SSL3_ST_CW_KEY_EXCH_B: 418 if (SSL_is_dtls(s)) 419 dtls1_start_timer(s); 420 ret = ssl3_send_client_key_exchange(s); 421 if (ret <= 0) 422 goto end; 423 /* 424 * EAY EAY EAY need to check for DH fix cert 425 * sent back 426 */ 427 /* 428 * For TLS, cert_req is set to 2, so a cert chain 429 * of nothing is sent, but no verify packet is sent 430 */ 431 /* 432 * XXX: For now, we do not support client 433 * authentication in ECDH cipher suites with 434 * ECDH (rather than ECDSA) certificates. 435 * We need to skip the certificate verify 436 * message when client's ECDH public key is sent 437 * inside the client certificate. 438 */ 439 if (S3I(s)->hs.tls12.cert_request == 1) { 440 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_A; 441 } else { 442 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 443 S3I(s)->change_cipher_spec = 0; 444 } 445 if (!SSL_is_dtls(s)) { 446 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 447 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 448 S3I(s)->change_cipher_spec = 0; 449 } 450 } 451 452 s->internal->init_num = 0; 453 break; 454 455 case SSL3_ST_CW_CERT_VRFY_A: 456 case SSL3_ST_CW_CERT_VRFY_B: 457 if (SSL_is_dtls(s)) 458 dtls1_start_timer(s); 459 ret = ssl3_send_client_verify(s); 460 if (ret <= 0) 461 goto end; 462 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 463 s->internal->init_num = 0; 464 S3I(s)->change_cipher_spec = 0; 465 break; 466 467 case SSL3_ST_CW_CHANGE_A: 468 case SSL3_ST_CW_CHANGE_B: 469 if (SSL_is_dtls(s) && !s->internal->hit) 470 dtls1_start_timer(s); 471 ret = ssl3_send_change_cipher_spec(s, 472 SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B); 473 if (ret <= 0) 474 goto end; 475 476 S3I(s)->hs.state = SSL3_ST_CW_FINISHED_A; 477 s->internal->init_num = 0; 478 s->session->cipher = S3I(s)->hs.cipher; 479 480 if (!tls1_setup_key_block(s)) { 481 ret = -1; 482 goto end; 483 } 484 if (!tls1_change_write_cipher_state(s)) { 485 ret = -1; 486 goto end; 487 } 488 break; 489 490 case SSL3_ST_CW_FINISHED_A: 491 case SSL3_ST_CW_FINISHED_B: 492 if (SSL_is_dtls(s) && !s->internal->hit) 493 dtls1_start_timer(s); 494 ret = ssl3_send_finished(s, SSL3_ST_CW_FINISHED_A, 495 SSL3_ST_CW_FINISHED_B); 496 if (ret <= 0) 497 goto end; 498 if (!SSL_is_dtls(s)) 499 s->s3->flags |= SSL3_FLAGS_CCS_OK; 500 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 501 502 /* clear flags */ 503 if (s->internal->hit) { 504 S3I(s)->hs.tls12.next_state = SSL_ST_OK; 505 } else { 506 /* Allow NewSessionTicket if ticket expected */ 507 if (s->internal->tlsext_ticket_expected) 508 S3I(s)->hs.tls12.next_state = 509 SSL3_ST_CR_SESSION_TICKET_A; 510 else 511 S3I(s)->hs.tls12.next_state = 512 SSL3_ST_CR_FINISHED_A; 513 } 514 s->internal->init_num = 0; 515 break; 516 517 case SSL3_ST_CR_SESSION_TICKET_A: 518 case SSL3_ST_CR_SESSION_TICKET_B: 519 ret = ssl3_get_new_session_ticket(s); 520 if (ret <= 0) 521 goto end; 522 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 523 s->internal->init_num = 0; 524 break; 525 526 case SSL3_ST_CR_CERT_STATUS_A: 527 case SSL3_ST_CR_CERT_STATUS_B: 528 ret = ssl3_get_cert_status(s); 529 if (ret <= 0) 530 goto end; 531 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 532 s->internal->init_num = 0; 533 break; 534 535 case SSL3_ST_CR_FINISHED_A: 536 case SSL3_ST_CR_FINISHED_B: 537 if (SSL_is_dtls(s)) 538 D1I(s)->change_cipher_spec_ok = 1; 539 else 540 s->s3->flags |= SSL3_FLAGS_CCS_OK; 541 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 542 SSL3_ST_CR_FINISHED_B); 543 if (ret <= 0) 544 goto end; 545 if (SSL_is_dtls(s)) 546 dtls1_stop_timer(s); 547 548 if (s->internal->hit) 549 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 550 else 551 S3I(s)->hs.state = SSL_ST_OK; 552 s->internal->init_num = 0; 553 break; 554 555 case SSL3_ST_CW_FLUSH: 556 s->internal->rwstate = SSL_WRITING; 557 if (BIO_flush(s->wbio) <= 0) { 558 if (SSL_is_dtls(s)) { 559 /* If the write error was fatal, stop trying */ 560 if (!BIO_should_retry(s->wbio)) { 561 s->internal->rwstate = SSL_NOTHING; 562 S3I(s)->hs.state = S3I(s)->hs.tls12.next_state; 563 } 564 } 565 ret = -1; 566 goto end; 567 } 568 s->internal->rwstate = SSL_NOTHING; 569 S3I(s)->hs.state = S3I(s)->hs.tls12.next_state; 570 break; 571 572 case SSL_ST_OK: 573 /* clean a few things up */ 574 tls1_cleanup_key_block(s); 575 576 if (S3I(s)->handshake_transcript != NULL) { 577 SSLerror(s, ERR_R_INTERNAL_ERROR); 578 ret = -1; 579 goto end; 580 } 581 582 if (!SSL_is_dtls(s)) 583 ssl3_release_init_buffer(s); 584 585 ssl_free_wbio_buffer(s); 586 587 s->internal->init_num = 0; 588 s->internal->renegotiate = 0; 589 s->internal->new_session = 0; 590 591 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 592 if (s->internal->hit) 593 s->ctx->internal->stats.sess_hit++; 594 595 ret = 1; 596 /* s->server=0; */ 597 s->internal->handshake_func = ssl3_connect; 598 s->ctx->internal->stats.sess_connect_good++; 599 600 if (cb != NULL) 601 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 602 603 if (SSL_is_dtls(s)) { 604 /* done with handshaking */ 605 D1I(s)->handshake_read_seq = 0; 606 D1I(s)->next_handshake_write_seq = 0; 607 } 608 609 goto end; 610 /* break; */ 611 612 default: 613 SSLerror(s, SSL_R_UNKNOWN_STATE); 614 ret = -1; 615 goto end; 616 /* break; */ 617 } 618 619 /* did we do anything */ 620 if (!S3I(s)->hs.tls12.reuse_message && !skip) { 621 if (s->internal->debug) { 622 if ((ret = BIO_flush(s->wbio)) <= 0) 623 goto end; 624 } 625 626 if ((cb != NULL) && (S3I(s)->hs.state != state)) { 627 new_state = S3I(s)->hs.state; 628 S3I(s)->hs.state = state; 629 cb(s, SSL_CB_CONNECT_LOOP, 1); 630 S3I(s)->hs.state = new_state; 631 } 632 } 633 skip = 0; 634 } 635 636 end: 637 s->internal->in_handshake--; 638 if (cb != NULL) 639 cb(s, SSL_CB_CONNECT_EXIT, ret); 640 641 return (ret); 642 } 643 644 int 645 ssl3_send_client_hello(SSL *s) 646 { 647 CBB cbb, client_hello, session_id, cookie, cipher_suites; 648 CBB compression_methods; 649 uint16_t max_version; 650 size_t sl; 651 652 memset(&cbb, 0, sizeof(cbb)); 653 654 if (S3I(s)->hs.state == SSL3_ST_CW_CLNT_HELLO_A) { 655 SSL_SESSION *sess = s->session; 656 657 if (!ssl_max_supported_version(s, &max_version)) { 658 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 659 return (-1); 660 } 661 s->client_version = s->version = max_version; 662 663 if (sess == NULL || 664 sess->ssl_version != s->version || 665 (!sess->session_id_length && !sess->tlsext_tick) || 666 sess->internal->not_resumable) { 667 if (!ssl_get_new_session(s, 0)) 668 goto err; 669 } 670 /* else use the pre-loaded session */ 671 672 /* 673 * If a DTLS ClientHello message is being resent after a 674 * HelloVerifyRequest, we must retain the original client 675 * random value. 676 */ 677 if (!SSL_is_dtls(s) || D1I(s)->send_cookie == 0) 678 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE); 679 680 if (!ssl3_handshake_msg_start(s, &cbb, &client_hello, 681 SSL3_MT_CLIENT_HELLO)) 682 goto err; 683 684 /* 685 * Version indicates the negotiated version: for example from 686 * an SSLv2/v3 compatible client hello). The client_version 687 * field is the maximum version we permit and it is also 688 * used in RSA encrypted premaster secrets. Some servers can 689 * choke if we initially report a higher version then 690 * renegotiate to a lower one in the premaster secret. This 691 * didn't happen with TLS 1.0 as most servers supported it 692 * but it can with TLS 1.1 or later if the server only supports 693 * 1.0. 694 * 695 * Possible scenario with previous logic: 696 * 1. Client hello indicates TLS 1.2 697 * 2. Server hello says TLS 1.0 698 * 3. RSA encrypted premaster secret uses 1.2. 699 * 4. Handhaked proceeds using TLS 1.0. 700 * 5. Server sends hello request to renegotiate. 701 * 6. Client hello indicates TLS v1.0 as we now 702 * know that is maximum server supports. 703 * 7. Server chokes on RSA encrypted premaster secret 704 * containing version 1.0. 705 * 706 * For interoperability it should be OK to always use the 707 * maximum version we support in client hello and then rely 708 * on the checking of version to ensure the servers isn't 709 * being inconsistent: for example initially negotiating with 710 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using 711 * client_version in client hello and not resetting it to 712 * the negotiated version. 713 */ 714 if (!CBB_add_u16(&client_hello, s->client_version)) 715 goto err; 716 717 /* Random stuff */ 718 if (!CBB_add_bytes(&client_hello, s->s3->client_random, 719 sizeof(s->s3->client_random))) 720 goto err; 721 722 /* Session ID */ 723 if (!CBB_add_u8_length_prefixed(&client_hello, &session_id)) 724 goto err; 725 if (!s->internal->new_session && 726 s->session->session_id_length > 0) { 727 sl = s->session->session_id_length; 728 if (sl > sizeof(s->session->session_id)) { 729 SSLerror(s, ERR_R_INTERNAL_ERROR); 730 goto err; 731 } 732 if (!CBB_add_bytes(&session_id, 733 s->session->session_id, sl)) 734 goto err; 735 } 736 737 /* DTLS Cookie. */ 738 if (SSL_is_dtls(s)) { 739 if (D1I(s)->cookie_len > sizeof(D1I(s)->cookie)) { 740 SSLerror(s, ERR_R_INTERNAL_ERROR); 741 goto err; 742 } 743 if (!CBB_add_u8_length_prefixed(&client_hello, &cookie)) 744 goto err; 745 if (!CBB_add_bytes(&cookie, D1I(s)->cookie, 746 D1I(s)->cookie_len)) 747 goto err; 748 } 749 750 /* Ciphers supported */ 751 if (!CBB_add_u16_length_prefixed(&client_hello, &cipher_suites)) 752 return 0; 753 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), 754 &cipher_suites)) { 755 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE); 756 goto err; 757 } 758 759 /* Add in compression methods (null) */ 760 if (!CBB_add_u8_length_prefixed(&client_hello, 761 &compression_methods)) 762 goto err; 763 if (!CBB_add_u8(&compression_methods, 0)) 764 goto err; 765 766 /* TLS extensions */ 767 if (!tlsext_client_build(s, SSL_TLSEXT_MSG_CH, &client_hello)) { 768 SSLerror(s, ERR_R_INTERNAL_ERROR); 769 goto err; 770 } 771 772 if (!ssl3_handshake_msg_finish(s, &cbb)) 773 goto err; 774 775 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_B; 776 } 777 778 /* SSL3_ST_CW_CLNT_HELLO_B */ 779 return (ssl3_handshake_write(s)); 780 781 err: 782 CBB_cleanup(&cbb); 783 784 return (-1); 785 } 786 787 int 788 ssl3_get_dtls_hello_verify(SSL *s) 789 { 790 long n; 791 int al, ok = 0; 792 size_t cookie_len; 793 uint16_t ssl_version; 794 CBS hello_verify_request, cookie; 795 796 n = ssl3_get_message(s, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 797 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, s->internal->max_cert_list, &ok); 798 if (!ok) 799 return ((int)n); 800 801 if (S3I(s)->hs.tls12.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 802 D1I(s)->send_cookie = 0; 803 S3I(s)->hs.tls12.reuse_message = 1; 804 return (1); 805 } 806 807 if (n < 0) 808 goto decode_err; 809 810 CBS_init(&hello_verify_request, s->internal->init_msg, n); 811 812 if (!CBS_get_u16(&hello_verify_request, &ssl_version)) 813 goto decode_err; 814 if (!CBS_get_u8_length_prefixed(&hello_verify_request, &cookie)) 815 goto decode_err; 816 if (CBS_len(&hello_verify_request) != 0) 817 goto decode_err; 818 819 /* 820 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should always 821 * contain DTLSv1.0 the version that is going to be negotiated. 822 * Tolerate DTLSv1.2 just in case. 823 */ 824 if (ssl_version != DTLS1_VERSION && ssl_version != DTLS1_2_VERSION) { 825 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 826 s->version = (s->version & 0xff00) | (ssl_version & 0xff); 827 al = SSL_AD_PROTOCOL_VERSION; 828 goto fatal_err; 829 } 830 831 if (!CBS_write_bytes(&cookie, D1I(s)->cookie, 832 sizeof(D1I(s)->cookie), &cookie_len)) { 833 D1I(s)->cookie_len = 0; 834 al = SSL_AD_ILLEGAL_PARAMETER; 835 goto fatal_err; 836 } 837 D1I(s)->cookie_len = cookie_len; 838 D1I(s)->send_cookie = 1; 839 840 return 1; 841 842 decode_err: 843 al = SSL_AD_DECODE_ERROR; 844 fatal_err: 845 ssl3_send_alert(s, SSL3_AL_FATAL, al); 846 return -1; 847 } 848 849 int 850 ssl3_get_server_hello(SSL *s) 851 { 852 CBS cbs, server_random, session_id; 853 uint16_t server_version, cipher_suite; 854 uint8_t compression_method; 855 const SSL_CIPHER *cipher; 856 const SSL_METHOD *method; 857 unsigned long alg_k; 858 size_t outlen; 859 int al, ok; 860 long n; 861 862 s->internal->first_packet = 1; 863 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 864 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, /* ?? */ &ok); 865 if (!ok) 866 return ((int)n); 867 s->internal->first_packet = 0; 868 869 if (n < 0) 870 goto decode_err; 871 872 CBS_init(&cbs, s->internal->init_msg, n); 873 874 if (SSL_is_dtls(s)) { 875 if (S3I(s)->hs.tls12.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 876 if (D1I(s)->send_cookie == 0) { 877 S3I(s)->hs.tls12.reuse_message = 1; 878 return (1); 879 } else { 880 /* Already sent a cookie. */ 881 al = SSL_AD_UNEXPECTED_MESSAGE; 882 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 883 goto fatal_err; 884 } 885 } 886 } 887 888 if (S3I(s)->hs.tls12.message_type != SSL3_MT_SERVER_HELLO) { 889 al = SSL_AD_UNEXPECTED_MESSAGE; 890 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 891 goto fatal_err; 892 } 893 894 if (!CBS_get_u16(&cbs, &server_version)) 895 goto decode_err; 896 897 if (!ssl_check_version_from_server(s, server_version)) { 898 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 899 s->version = (s->version & 0xff00) | (server_version & 0xff); 900 al = SSL_AD_PROTOCOL_VERSION; 901 goto fatal_err; 902 } 903 s->version = server_version; 904 905 S3I(s)->hs.negotiated_tls_version = ssl_tls_version(server_version); 906 if (S3I(s)->hs.negotiated_tls_version == 0) { 907 SSLerror(s, ERR_R_INTERNAL_ERROR); 908 goto err; 909 } 910 911 if ((method = ssl_get_method(server_version)) == NULL) { 912 SSLerror(s, ERR_R_INTERNAL_ERROR); 913 goto err; 914 } 915 s->method = method; 916 917 /* Server random. */ 918 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 919 goto decode_err; 920 if (!CBS_write_bytes(&server_random, s->s3->server_random, 921 sizeof(s->s3->server_random), NULL)) 922 goto err; 923 924 if (S3I(s)->hs.our_max_tls_version >= TLS1_2_VERSION && 925 S3I(s)->hs.negotiated_tls_version < S3I(s)->hs.our_max_tls_version) { 926 /* 927 * RFC 8446 section 4.1.3. We must not downgrade if the server 928 * random value contains the TLS 1.2 or TLS 1.1 magical value. 929 */ 930 if (!CBS_skip(&server_random, 931 CBS_len(&server_random) - sizeof(tls13_downgrade_12))) 932 goto err; 933 if (S3I(s)->hs.negotiated_tls_version == TLS1_2_VERSION && 934 CBS_mem_equal(&server_random, tls13_downgrade_12, 935 sizeof(tls13_downgrade_12))) { 936 al = SSL_AD_ILLEGAL_PARAMETER; 937 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 938 goto fatal_err; 939 } 940 if (CBS_mem_equal(&server_random, tls13_downgrade_11, 941 sizeof(tls13_downgrade_11))) { 942 al = SSL_AD_ILLEGAL_PARAMETER; 943 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 944 goto fatal_err; 945 } 946 } 947 948 /* Session ID. */ 949 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 950 goto decode_err; 951 952 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 953 al = SSL_AD_ILLEGAL_PARAMETER; 954 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 955 goto fatal_err; 956 } 957 958 /* Cipher suite. */ 959 if (!CBS_get_u16(&cbs, &cipher_suite)) 960 goto decode_err; 961 962 /* 963 * Check if we want to resume the session based on external 964 * pre-shared secret. 965 */ 966 if (s->internal->tls_session_secret_cb) { 967 SSL_CIPHER *pref_cipher = NULL; 968 s->session->master_key_length = sizeof(s->session->master_key); 969 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 970 &s->session->master_key_length, NULL, &pref_cipher, 971 s->internal->tls_session_secret_cb_arg)) { 972 s->session->cipher = pref_cipher ? pref_cipher : 973 ssl3_get_cipher_by_value(cipher_suite); 974 s->s3->flags |= SSL3_FLAGS_CCS_OK; 975 } 976 } 977 978 if (s->session->session_id_length != 0 && 979 CBS_mem_equal(&session_id, s->session->session_id, 980 s->session->session_id_length)) { 981 if (s->sid_ctx_length != s->session->sid_ctx_length || 982 timingsafe_memcmp(s->session->sid_ctx, 983 s->sid_ctx, s->sid_ctx_length) != 0) { 984 /* actually a client application bug */ 985 al = SSL_AD_ILLEGAL_PARAMETER; 986 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 987 goto fatal_err; 988 } 989 s->s3->flags |= SSL3_FLAGS_CCS_OK; 990 s->internal->hit = 1; 991 } else { 992 /* a miss or crap from the other end */ 993 994 /* If we were trying for session-id reuse, make a new 995 * SSL_SESSION so we don't stuff up other people */ 996 s->internal->hit = 0; 997 if (s->session->session_id_length > 0) { 998 if (!ssl_get_new_session(s, 0)) { 999 al = SSL_AD_INTERNAL_ERROR; 1000 goto fatal_err; 1001 } 1002 } 1003 1004 /* 1005 * XXX - improve the handling for the case where there is a 1006 * zero length session identifier. 1007 */ 1008 if (!CBS_write_bytes(&session_id, s->session->session_id, 1009 sizeof(s->session->session_id), &outlen)) 1010 goto err; 1011 s->session->session_id_length = outlen; 1012 1013 s->session->ssl_version = s->version; 1014 } 1015 1016 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 1017 al = SSL_AD_ILLEGAL_PARAMETER; 1018 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 1019 goto fatal_err; 1020 } 1021 1022 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 1023 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 1024 S3I(s)->hs.negotiated_tls_version < TLS1_2_VERSION) { 1025 al = SSL_AD_ILLEGAL_PARAMETER; 1026 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1027 goto fatal_err; 1028 } 1029 1030 if (!ssl_cipher_in_list(SSL_get_ciphers(s), cipher)) { 1031 /* we did not say we would use this cipher */ 1032 al = SSL_AD_ILLEGAL_PARAMETER; 1033 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1034 goto fatal_err; 1035 } 1036 1037 /* 1038 * Depending on the session caching (internal/external), the cipher 1039 * and/or cipher_id values may not be set. Make sure that 1040 * cipher_id is set and use it for comparison. 1041 */ 1042 if (s->session->cipher) 1043 s->session->cipher_id = s->session->cipher->id; 1044 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 1045 al = SSL_AD_ILLEGAL_PARAMETER; 1046 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1047 goto fatal_err; 1048 } 1049 S3I(s)->hs.cipher = cipher; 1050 1051 if (!tls1_transcript_hash_init(s)) 1052 goto err; 1053 1054 /* 1055 * Don't digest cached records if no sigalgs: we may need them for 1056 * client authentication. 1057 */ 1058 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 1059 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST))) 1060 tls1_transcript_free(s); 1061 1062 if (!CBS_get_u8(&cbs, &compression_method)) 1063 goto decode_err; 1064 1065 if (compression_method != 0) { 1066 al = SSL_AD_ILLEGAL_PARAMETER; 1067 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1068 goto fatal_err; 1069 } 1070 1071 if (!tlsext_client_parse(s, SSL_TLSEXT_MSG_SH, &cbs, &al)) { 1072 SSLerror(s, SSL_R_PARSE_TLSEXT); 1073 goto fatal_err; 1074 } 1075 1076 /* 1077 * Determine if we need to see RI. Strictly speaking if we want to 1078 * avoid an attack we should *always* see RI even on initial server 1079 * hello because the client doesn't see any renegotiation during an 1080 * attack. However this would mean we could not connect to any server 1081 * which doesn't support RI so for the immediate future tolerate RI 1082 * absence on initial connect only. 1083 */ 1084 if (!S3I(s)->renegotiate_seen && 1085 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1086 al = SSL_AD_HANDSHAKE_FAILURE; 1087 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1088 goto fatal_err; 1089 } 1090 1091 if (ssl_check_serverhello_tlsext(s) <= 0) { 1092 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1093 goto err; 1094 } 1095 1096 return (1); 1097 1098 decode_err: 1099 /* wrong packet length */ 1100 al = SSL_AD_DECODE_ERROR; 1101 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1102 fatal_err: 1103 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1104 err: 1105 return (-1); 1106 } 1107 1108 int 1109 ssl3_get_server_certificate(SSL *s) 1110 { 1111 int al, i, ok, ret = -1; 1112 long n; 1113 CBS cbs, cert_list; 1114 X509 *x = NULL; 1115 const unsigned char *q; 1116 STACK_OF(X509) *sk = NULL; 1117 SESS_CERT *sc; 1118 EVP_PKEY *pkey = NULL; 1119 1120 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1121 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 1122 if (!ok) 1123 return ((int)n); 1124 1125 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1126 S3I(s)->hs.tls12.reuse_message = 1; 1127 return (1); 1128 } 1129 1130 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE) { 1131 al = SSL_AD_UNEXPECTED_MESSAGE; 1132 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1133 goto fatal_err; 1134 } 1135 1136 1137 if ((sk = sk_X509_new_null()) == NULL) { 1138 SSLerror(s, ERR_R_MALLOC_FAILURE); 1139 goto err; 1140 } 1141 1142 if (n < 0) 1143 goto decode_err; 1144 1145 CBS_init(&cbs, s->internal->init_msg, n); 1146 if (CBS_len(&cbs) < 3) 1147 goto decode_err; 1148 1149 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1150 CBS_len(&cbs) != 0) { 1151 al = SSL_AD_DECODE_ERROR; 1152 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1153 goto fatal_err; 1154 } 1155 1156 while (CBS_len(&cert_list) > 0) { 1157 CBS cert; 1158 1159 if (CBS_len(&cert_list) < 3) 1160 goto decode_err; 1161 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1162 al = SSL_AD_DECODE_ERROR; 1163 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1164 goto fatal_err; 1165 } 1166 1167 q = CBS_data(&cert); 1168 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1169 if (x == NULL) { 1170 al = SSL_AD_BAD_CERTIFICATE; 1171 SSLerror(s, ERR_R_ASN1_LIB); 1172 goto fatal_err; 1173 } 1174 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1175 al = SSL_AD_DECODE_ERROR; 1176 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1177 goto fatal_err; 1178 } 1179 if (!sk_X509_push(sk, x)) { 1180 SSLerror(s, ERR_R_MALLOC_FAILURE); 1181 goto err; 1182 } 1183 x = NULL; 1184 } 1185 1186 i = ssl_verify_cert_chain(s, sk); 1187 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1188 al = ssl_verify_alarm_type(s->verify_result); 1189 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1190 goto fatal_err; 1191 1192 } 1193 ERR_clear_error(); /* but we keep s->verify_result */ 1194 1195 sc = ssl_sess_cert_new(); 1196 if (sc == NULL) 1197 goto err; 1198 ssl_sess_cert_free(SSI(s)->sess_cert); 1199 SSI(s)->sess_cert = sc; 1200 1201 sc->cert_chain = sk; 1202 /* 1203 * Inconsistency alert: cert_chain does include the peer's 1204 * certificate, which we don't include in s3_srvr.c 1205 */ 1206 x = sk_X509_value(sk, 0); 1207 sk = NULL; 1208 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1209 1210 pkey = X509_get_pubkey(x); 1211 1212 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1213 x = NULL; 1214 al = SSL3_AL_FATAL; 1215 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1216 goto fatal_err; 1217 } 1218 1219 i = ssl_cert_type(x, pkey); 1220 if (i < 0) { 1221 x = NULL; 1222 al = SSL3_AL_FATAL; 1223 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1224 goto fatal_err; 1225 } 1226 1227 sc->peer_cert_type = i; 1228 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1229 /* 1230 * Why would the following ever happen? 1231 * We just created sc a couple of lines ago. 1232 */ 1233 X509_free(sc->peer_pkeys[i].x509); 1234 sc->peer_pkeys[i].x509 = x; 1235 sc->peer_key = &(sc->peer_pkeys[i]); 1236 1237 X509_free(s->session->peer); 1238 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1239 s->session->peer = x; 1240 s->session->verify_result = s->verify_result; 1241 1242 x = NULL; 1243 ret = 1; 1244 1245 if (0) { 1246 decode_err: 1247 /* wrong packet length */ 1248 al = SSL_AD_DECODE_ERROR; 1249 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1250 fatal_err: 1251 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1252 } 1253 err: 1254 EVP_PKEY_free(pkey); 1255 X509_free(x); 1256 sk_X509_pop_free(sk, X509_free); 1257 1258 return (ret); 1259 } 1260 1261 static int 1262 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1263 { 1264 CBS dhp, dhg, dhpk; 1265 BN_CTX *bn_ctx = NULL; 1266 SESS_CERT *sc = NULL; 1267 DH *dh = NULL; 1268 long alg_a; 1269 int al; 1270 1271 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1272 sc = SSI(s)->sess_cert; 1273 1274 if ((dh = DH_new()) == NULL) { 1275 SSLerror(s, ERR_R_DH_LIB); 1276 goto err; 1277 } 1278 1279 if (!CBS_get_u16_length_prefixed(cbs, &dhp)) 1280 goto decode_err; 1281 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1282 SSLerror(s, ERR_R_BN_LIB); 1283 goto err; 1284 } 1285 1286 if (!CBS_get_u16_length_prefixed(cbs, &dhg)) 1287 goto decode_err; 1288 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1289 SSLerror(s, ERR_R_BN_LIB); 1290 goto err; 1291 } 1292 1293 if (!CBS_get_u16_length_prefixed(cbs, &dhpk)) 1294 goto decode_err; 1295 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1296 NULL)) == NULL) { 1297 SSLerror(s, ERR_R_BN_LIB); 1298 goto err; 1299 } 1300 1301 /* 1302 * Check the strength of the DH key just constructed. 1303 * Discard keys weaker than 1024 bits. 1304 */ 1305 if (DH_size(dh) < 1024 / 8) { 1306 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1307 goto err; 1308 } 1309 1310 if (alg_a & SSL_aRSA) 1311 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1312 else 1313 /* XXX - Anonymous DH, so no certificate or pkey. */ 1314 *pkey = NULL; 1315 1316 sc->peer_dh_tmp = dh; 1317 1318 return (1); 1319 1320 decode_err: 1321 al = SSL_AD_DECODE_ERROR; 1322 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1323 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1324 1325 err: 1326 DH_free(dh); 1327 BN_CTX_free(bn_ctx); 1328 1329 return (-1); 1330 } 1331 1332 static int 1333 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1334 { 1335 EC_KEY *ecdh = NULL; 1336 int ret = -1; 1337 1338 /* Extract the server's ephemeral ECDH public key. */ 1339 if ((ecdh = EC_KEY_new()) == NULL) { 1340 SSLerror(s, ERR_R_MALLOC_FAILURE); 1341 goto err; 1342 } 1343 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh, nid, public)) { 1344 SSLerror(s, SSL_R_BAD_ECPOINT); 1345 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1346 goto err; 1347 } 1348 1349 sc->peer_nid = nid; 1350 sc->peer_ecdh_tmp = ecdh; 1351 ecdh = NULL; 1352 1353 ret = 1; 1354 1355 err: 1356 EC_KEY_free(ecdh); 1357 1358 return (ret); 1359 } 1360 1361 static int 1362 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1363 { 1364 size_t outlen; 1365 1366 if (nid != NID_X25519) { 1367 SSLerror(s, ERR_R_INTERNAL_ERROR); 1368 goto err; 1369 } 1370 1371 if (CBS_len(public) != X25519_KEY_LENGTH) { 1372 SSLerror(s, SSL_R_BAD_ECPOINT); 1373 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1374 goto err; 1375 } 1376 1377 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1378 SSLerror(s, ERR_R_MALLOC_FAILURE); 1379 goto err; 1380 } 1381 1382 return (1); 1383 1384 err: 1385 return (-1); 1386 } 1387 1388 static int 1389 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1390 { 1391 CBS public; 1392 uint8_t curve_type; 1393 uint16_t curve_id; 1394 SESS_CERT *sc; 1395 long alg_a; 1396 int nid; 1397 int al; 1398 1399 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1400 sc = SSI(s)->sess_cert; 1401 1402 /* Only named curves are supported. */ 1403 if (!CBS_get_u8(cbs, &curve_type) || 1404 curve_type != NAMED_CURVE_TYPE || 1405 !CBS_get_u16(cbs, &curve_id)) { 1406 al = SSL_AD_DECODE_ERROR; 1407 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1408 goto fatal_err; 1409 } 1410 1411 /* 1412 * Check that the curve is one of our preferences - if it is not, 1413 * the server has sent us an invalid curve. 1414 */ 1415 if (tls1_check_curve(s, curve_id) != 1) { 1416 al = SSL_AD_DECODE_ERROR; 1417 SSLerror(s, SSL_R_WRONG_CURVE); 1418 goto fatal_err; 1419 } 1420 1421 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1422 al = SSL_AD_INTERNAL_ERROR; 1423 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1424 goto fatal_err; 1425 } 1426 1427 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1428 goto decode_err; 1429 1430 if (nid == NID_X25519) { 1431 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1432 goto err; 1433 } else { 1434 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1435 goto err; 1436 } 1437 1438 /* 1439 * The ECC/TLS specification does not mention the use of DSA to sign 1440 * ECParameters in the server key exchange message. We do support RSA 1441 * and ECDSA. 1442 */ 1443 if (alg_a & SSL_aRSA) 1444 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1445 else if (alg_a & SSL_aECDSA) 1446 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1447 else 1448 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1449 *pkey = NULL; 1450 1451 return (1); 1452 1453 decode_err: 1454 al = SSL_AD_DECODE_ERROR; 1455 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1456 1457 fatal_err: 1458 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1459 1460 err: 1461 return (-1); 1462 } 1463 1464 int 1465 ssl3_get_server_key_exchange(SSL *s) 1466 { 1467 CBS cbs, signature; 1468 EVP_PKEY *pkey = NULL; 1469 EVP_MD_CTX md_ctx; 1470 const unsigned char *param; 1471 long n, alg_k, alg_a; 1472 int al, ok; 1473 size_t param_len; 1474 1475 EVP_MD_CTX_init(&md_ctx); 1476 1477 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 1478 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1479 1480 /* 1481 * Use same message size as in ssl3_get_certificate_request() 1482 * as ServerKeyExchange message may be skipped. 1483 */ 1484 n = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1485 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1486 if (!ok) 1487 return ((int)n); 1488 1489 if (n < 0) 1490 goto err; 1491 1492 CBS_init(&cbs, s->internal->init_msg, n); 1493 1494 if (S3I(s)->hs.tls12.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1495 /* 1496 * Do not skip server key exchange if this cipher suite uses 1497 * ephemeral keys. 1498 */ 1499 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1500 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1501 al = SSL_AD_UNEXPECTED_MESSAGE; 1502 goto fatal_err; 1503 } 1504 1505 S3I(s)->hs.tls12.reuse_message = 1; 1506 EVP_MD_CTX_cleanup(&md_ctx); 1507 return (1); 1508 } 1509 1510 if (SSI(s)->sess_cert != NULL) { 1511 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1512 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1513 1514 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1515 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1516 1517 free(SSI(s)->sess_cert->peer_x25519_tmp); 1518 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1519 } else { 1520 SSI(s)->sess_cert = ssl_sess_cert_new(); 1521 if (SSI(s)->sess_cert == NULL) 1522 goto err; 1523 } 1524 1525 param = CBS_data(&cbs); 1526 param_len = CBS_len(&cbs); 1527 1528 if (alg_k & SSL_kDHE) { 1529 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1) 1530 goto err; 1531 } else if (alg_k & SSL_kECDHE) { 1532 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1) 1533 goto err; 1534 } else if (alg_k != 0) { 1535 al = SSL_AD_UNEXPECTED_MESSAGE; 1536 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1537 goto fatal_err; 1538 } 1539 1540 param_len -= CBS_len(&cbs); 1541 1542 /* if it was signed, check the signature */ 1543 if (pkey != NULL) { 1544 uint16_t sigalg_value = SIGALG_NONE; 1545 const struct ssl_sigalg *sigalg; 1546 EVP_PKEY_CTX *pctx; 1547 1548 if (SSL_USE_SIGALGS(s)) { 1549 if (!CBS_get_u16(&cbs, &sigalg_value)) 1550 goto decode_err; 1551 } 1552 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1553 goto decode_err; 1554 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1555 al = SSL_AD_DECODE_ERROR; 1556 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1557 goto fatal_err; 1558 } 1559 1560 if ((sigalg = ssl_sigalg_for_peer(s, pkey, 1561 sigalg_value)) == NULL) { 1562 al = SSL_AD_DECODE_ERROR; 1563 goto fatal_err; 1564 } 1565 S3I(s)->hs.peer_sigalg = sigalg; 1566 1567 if (!EVP_DigestVerifyInit(&md_ctx, &pctx, sigalg->md(), 1568 NULL, pkey)) 1569 goto err; 1570 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->client_random, 1571 SSL3_RANDOM_SIZE)) 1572 goto err; 1573 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1574 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1575 RSA_PKCS1_PSS_PADDING) || 1576 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1577 goto err; 1578 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->server_random, 1579 SSL3_RANDOM_SIZE)) 1580 goto err; 1581 if (!EVP_DigestVerifyUpdate(&md_ctx, param, param_len)) 1582 goto err; 1583 if (EVP_DigestVerifyFinal(&md_ctx, CBS_data(&signature), 1584 CBS_len(&signature)) <= 0) { 1585 al = SSL_AD_DECRYPT_ERROR; 1586 SSLerror(s, SSL_R_BAD_SIGNATURE); 1587 goto fatal_err; 1588 } 1589 } else { 1590 /* aNULL does not need public keys. */ 1591 if (!(alg_a & SSL_aNULL)) { 1592 SSLerror(s, ERR_R_INTERNAL_ERROR); 1593 goto err; 1594 } 1595 } 1596 1597 if (CBS_len(&cbs) != 0) { 1598 al = SSL_AD_DECODE_ERROR; 1599 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1600 goto fatal_err; 1601 } 1602 1603 EVP_PKEY_free(pkey); 1604 EVP_MD_CTX_cleanup(&md_ctx); 1605 1606 return (1); 1607 1608 decode_err: 1609 al = SSL_AD_DECODE_ERROR; 1610 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1611 1612 fatal_err: 1613 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1614 1615 err: 1616 EVP_PKEY_free(pkey); 1617 EVP_MD_CTX_cleanup(&md_ctx); 1618 1619 return (-1); 1620 } 1621 1622 int 1623 ssl3_get_certificate_request(SSL *s) 1624 { 1625 int ok, ret = 0; 1626 long n; 1627 CBS cert_request, cert_types, rdn_list; 1628 X509_NAME *xn = NULL; 1629 const unsigned char *q; 1630 STACK_OF(X509_NAME) *ca_sk = NULL; 1631 1632 n = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1633 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1634 if (!ok) 1635 return ((int)n); 1636 1637 S3I(s)->hs.tls12.cert_request = 0; 1638 1639 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_DONE) { 1640 S3I(s)->hs.tls12.reuse_message = 1; 1641 /* 1642 * If we get here we don't need any cached handshake records 1643 * as we wont be doing client auth. 1644 */ 1645 tls1_transcript_free(s); 1646 return (1); 1647 } 1648 1649 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1650 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1651 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1652 goto err; 1653 } 1654 1655 /* TLS does not like anon-DH with client cert */ 1656 if (S3I(s)->hs.cipher->algorithm_auth & SSL_aNULL) { 1657 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1658 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1659 goto err; 1660 } 1661 1662 if (n < 0) 1663 goto decode_err; 1664 CBS_init(&cert_request, s->internal->init_msg, n); 1665 1666 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1667 SSLerror(s, ERR_R_MALLOC_FAILURE); 1668 goto err; 1669 } 1670 1671 if (!CBS_get_u8_length_prefixed(&cert_request, &cert_types)) 1672 goto decode_err; 1673 1674 if (SSL_USE_SIGALGS(s)) { 1675 CBS sigalgs; 1676 1677 if (CBS_len(&cert_request) < 2) { 1678 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1679 goto err; 1680 } 1681 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1682 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1683 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1684 goto err; 1685 } 1686 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1687 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1688 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1689 goto err; 1690 } 1691 if (!CBS_stow(&sigalgs, &S3I(s)->hs.sigalgs, 1692 &S3I(s)->hs.sigalgs_len)) 1693 goto err; 1694 } 1695 1696 /* get the CA RDNs */ 1697 if (CBS_len(&cert_request) < 2) { 1698 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1699 goto err; 1700 } 1701 1702 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1703 CBS_len(&cert_request) != 0) { 1704 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1705 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1706 goto err; 1707 } 1708 1709 while (CBS_len(&rdn_list) > 0) { 1710 CBS rdn; 1711 1712 if (CBS_len(&rdn_list) < 2) { 1713 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1714 goto err; 1715 } 1716 1717 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1718 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1719 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1720 goto err; 1721 } 1722 1723 q = CBS_data(&rdn); 1724 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1725 ssl3_send_alert(s, SSL3_AL_FATAL, 1726 SSL_AD_DECODE_ERROR); 1727 SSLerror(s, ERR_R_ASN1_LIB); 1728 goto err; 1729 } 1730 1731 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1732 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1733 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1734 goto err; 1735 } 1736 if (!sk_X509_NAME_push(ca_sk, xn)) { 1737 SSLerror(s, ERR_R_MALLOC_FAILURE); 1738 goto err; 1739 } 1740 xn = NULL; /* avoid free in err block */ 1741 } 1742 1743 /* we should setup a certificate to return.... */ 1744 S3I(s)->hs.tls12.cert_request = 1; 1745 sk_X509_NAME_pop_free(S3I(s)->hs.tls12.ca_names, X509_NAME_free); 1746 S3I(s)->hs.tls12.ca_names = ca_sk; 1747 ca_sk = NULL; 1748 1749 ret = 1; 1750 if (0) { 1751 decode_err: 1752 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1753 } 1754 err: 1755 X509_NAME_free(xn); 1756 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1757 return (ret); 1758 } 1759 1760 static int 1761 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1762 { 1763 return (X509_NAME_cmp(*a, *b)); 1764 } 1765 1766 int 1767 ssl3_get_new_session_ticket(SSL *s) 1768 { 1769 int ok, al, ret = 0; 1770 uint32_t lifetime_hint; 1771 long n; 1772 CBS cbs, session_ticket; 1773 1774 n = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1775 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1776 if (!ok) 1777 return ((int)n); 1778 1779 if (S3I(s)->hs.tls12.message_type == SSL3_MT_FINISHED) { 1780 S3I(s)->hs.tls12.reuse_message = 1; 1781 return (1); 1782 } 1783 if (S3I(s)->hs.tls12.message_type != SSL3_MT_NEWSESSION_TICKET) { 1784 al = SSL_AD_UNEXPECTED_MESSAGE; 1785 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1786 goto fatal_err; 1787 } 1788 1789 if (n < 0) { 1790 al = SSL_AD_DECODE_ERROR; 1791 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1792 goto fatal_err; 1793 } 1794 1795 CBS_init(&cbs, s->internal->init_msg, n); 1796 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1797 #if UINT32_MAX > LONG_MAX 1798 lifetime_hint > LONG_MAX || 1799 #endif 1800 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1801 CBS_len(&cbs) != 0) { 1802 al = SSL_AD_DECODE_ERROR; 1803 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1804 goto fatal_err; 1805 } 1806 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1807 1808 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1809 &s->session->tlsext_ticklen)) { 1810 SSLerror(s, ERR_R_MALLOC_FAILURE); 1811 goto err; 1812 } 1813 1814 /* 1815 * There are two ways to detect a resumed ticket sesion. 1816 * One is to set an appropriate session ID and then the server 1817 * must return a match in ServerHello. This allows the normal 1818 * client session ID matching to work and we know much 1819 * earlier that the ticket has been accepted. 1820 * 1821 * The other way is to set zero length session ID when the 1822 * ticket is presented and rely on the handshake to determine 1823 * session resumption. 1824 * 1825 * We choose the former approach because this fits in with 1826 * assumptions elsewhere in OpenSSL. The session ID is set 1827 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1828 * ticket. 1829 */ 1830 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1831 s->session->session_id, &s->session->session_id_length, 1832 EVP_sha256(), NULL); 1833 ret = 1; 1834 return (ret); 1835 fatal_err: 1836 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1837 err: 1838 return (-1); 1839 } 1840 1841 int 1842 ssl3_get_cert_status(SSL *s) 1843 { 1844 CBS cert_status, response; 1845 int ok, al; 1846 long n; 1847 uint8_t status_type; 1848 1849 n = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1850 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 1851 16384, &ok); 1852 if (!ok) 1853 return ((int)n); 1854 1855 if (n < 0) { 1856 /* need at least status type + length */ 1857 al = SSL_AD_DECODE_ERROR; 1858 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1859 goto fatal_err; 1860 } 1861 1862 CBS_init(&cert_status, s->internal->init_msg, n); 1863 if (!CBS_get_u8(&cert_status, &status_type) || 1864 CBS_len(&cert_status) < 3) { 1865 /* need at least status type + length */ 1866 al = SSL_AD_DECODE_ERROR; 1867 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1868 goto fatal_err; 1869 } 1870 1871 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1872 al = SSL_AD_DECODE_ERROR; 1873 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1874 goto fatal_err; 1875 } 1876 1877 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1878 CBS_len(&cert_status) != 0) { 1879 al = SSL_AD_DECODE_ERROR; 1880 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1881 goto fatal_err; 1882 } 1883 1884 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1885 &s->internal->tlsext_ocsp_resp_len)) { 1886 al = SSL_AD_INTERNAL_ERROR; 1887 SSLerror(s, ERR_R_MALLOC_FAILURE); 1888 goto fatal_err; 1889 } 1890 1891 if (s->ctx->internal->tlsext_status_cb) { 1892 int ret; 1893 ret = s->ctx->internal->tlsext_status_cb(s, 1894 s->ctx->internal->tlsext_status_arg); 1895 if (ret == 0) { 1896 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1897 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1898 goto fatal_err; 1899 } 1900 if (ret < 0) { 1901 al = SSL_AD_INTERNAL_ERROR; 1902 SSLerror(s, ERR_R_MALLOC_FAILURE); 1903 goto fatal_err; 1904 } 1905 } 1906 return (1); 1907 fatal_err: 1908 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1909 return (-1); 1910 } 1911 1912 int 1913 ssl3_get_server_done(SSL *s) 1914 { 1915 int ok, ret = 0; 1916 long n; 1917 1918 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1919 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1920 30, /* should be very small, like 0 :-) */ &ok); 1921 if (!ok) 1922 return ((int)n); 1923 1924 if (n > 0) { 1925 /* should contain no data */ 1926 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1927 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1928 return (-1); 1929 } 1930 ret = 1; 1931 return (ret); 1932 } 1933 1934 static int 1935 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1936 { 1937 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1938 unsigned char *enc_pms = NULL; 1939 EVP_PKEY *pkey = NULL; 1940 int ret = -1; 1941 int enc_len; 1942 CBB epms; 1943 1944 /* 1945 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1946 */ 1947 1948 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA].x509); 1949 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1950 pkey->pkey.rsa == NULL) { 1951 SSLerror(s, ERR_R_INTERNAL_ERROR); 1952 goto err; 1953 } 1954 1955 /* XXX - our max protocol version. */ 1956 pms[0] = s->client_version >> 8; 1957 pms[1] = s->client_version & 0xff; 1958 arc4random_buf(&pms[2], sizeof(pms) - 2); 1959 1960 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1961 SSLerror(s, ERR_R_MALLOC_FAILURE); 1962 goto err; 1963 } 1964 1965 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 1966 RSA_PKCS1_PADDING); 1967 if (enc_len <= 0) { 1968 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1969 goto err; 1970 } 1971 1972 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1973 goto err; 1974 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 1975 goto err; 1976 if (!CBB_flush(cbb)) 1977 goto err; 1978 1979 if (!tls12_derive_master_secret(s, pms, sizeof(pms))) 1980 goto err; 1981 1982 ret = 1; 1983 1984 err: 1985 explicit_bzero(pms, sizeof(pms)); 1986 EVP_PKEY_free(pkey); 1987 free(enc_pms); 1988 1989 return (ret); 1990 } 1991 1992 static int 1993 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1994 { 1995 DH *dh_srvr = NULL, *dh_clnt = NULL; 1996 unsigned char *key = NULL; 1997 int key_size = 0, key_len; 1998 unsigned char *data; 1999 int ret = -1; 2000 CBB dh_Yc; 2001 2002 /* Ensure that we have an ephemeral key for DHE. */ 2003 if (sess_cert->peer_dh_tmp == NULL) { 2004 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2005 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 2006 goto err; 2007 } 2008 dh_srvr = sess_cert->peer_dh_tmp; 2009 2010 /* Generate a new random key. */ 2011 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2012 SSLerror(s, ERR_R_DH_LIB); 2013 goto err; 2014 } 2015 if (!DH_generate_key(dh_clnt)) { 2016 SSLerror(s, ERR_R_DH_LIB); 2017 goto err; 2018 } 2019 if ((key_size = DH_size(dh_clnt)) <= 0) { 2020 SSLerror(s, ERR_R_DH_LIB); 2021 goto err; 2022 } 2023 if ((key = malloc(key_size)) == NULL) { 2024 SSLerror(s, ERR_R_MALLOC_FAILURE); 2025 goto err; 2026 } 2027 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) { 2028 SSLerror(s, ERR_R_DH_LIB); 2029 goto err; 2030 } 2031 2032 if (!tls12_derive_master_secret(s, key, key_len)) 2033 goto err; 2034 2035 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2036 goto err; 2037 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2038 goto err; 2039 BN_bn2bin(dh_clnt->pub_key, data); 2040 if (!CBB_flush(cbb)) 2041 goto err; 2042 2043 ret = 1; 2044 2045 err: 2046 DH_free(dh_clnt); 2047 freezero(key, key_size); 2048 2049 return (ret); 2050 } 2051 2052 static int 2053 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2054 { 2055 EC_KEY *ecdh = NULL; 2056 uint8_t *key = NULL; 2057 size_t key_len = 0; 2058 int ret = -1; 2059 CBB ecpoint; 2060 2061 if ((ecdh = EC_KEY_new()) == NULL) { 2062 SSLerror(s, ERR_R_MALLOC_FAILURE); 2063 goto err; 2064 } 2065 2066 if (!ssl_kex_generate_ecdhe_ecp(ecdh, sc->peer_nid)) 2067 goto err; 2068 2069 /* Encode our public key. */ 2070 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2071 goto err; 2072 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 2073 goto err; 2074 if (!CBB_flush(cbb)) 2075 goto err; 2076 2077 if (!ssl_kex_derive_ecdhe_ecp(ecdh, sc->peer_ecdh_tmp, &key, &key_len)) 2078 goto err; 2079 if (!tls12_derive_master_secret(s, key, key_len)) 2080 goto err; 2081 2082 ret = 1; 2083 2084 err: 2085 freezero(key, key_len); 2086 EC_KEY_free(ecdh); 2087 2088 return (ret); 2089 } 2090 2091 static int 2092 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2093 { 2094 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2095 int ret = -1; 2096 CBB ecpoint; 2097 2098 /* Generate X25519 key pair and derive shared key. */ 2099 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2100 goto err; 2101 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2102 goto err; 2103 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2104 goto err; 2105 X25519_keypair(public_key, private_key); 2106 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2107 goto err; 2108 2109 /* Serialize the public key. */ 2110 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2111 goto err; 2112 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2113 goto err; 2114 if (!CBB_flush(cbb)) 2115 goto err; 2116 2117 if (!tls12_derive_master_secret(s, shared_key, X25519_KEY_LENGTH)) 2118 goto err; 2119 2120 ret = 1; 2121 2122 err: 2123 free(public_key); 2124 freezero(private_key, X25519_KEY_LENGTH); 2125 freezero(shared_key, X25519_KEY_LENGTH); 2126 2127 return (ret); 2128 } 2129 2130 static int 2131 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2132 { 2133 if (sc->peer_x25519_tmp != NULL) { 2134 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2135 goto err; 2136 } else if (sc->peer_ecdh_tmp != NULL) { 2137 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2138 goto err; 2139 } else { 2140 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2141 SSLerror(s, ERR_R_INTERNAL_ERROR); 2142 goto err; 2143 } 2144 2145 return (1); 2146 2147 err: 2148 return (-1); 2149 } 2150 2151 static int 2152 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2153 { 2154 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2155 EVP_PKEY *pub_key = NULL; 2156 EVP_PKEY_CTX *pkey_ctx; 2157 X509 *peer_cert; 2158 size_t msglen; 2159 unsigned int md_len; 2160 EVP_MD_CTX *ukm_hash; 2161 int ret = -1; 2162 int nid; 2163 CBB gostblob; 2164 2165 /* Get server sertificate PKEY and create ctx from it */ 2166 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2167 if (peer_cert == NULL) { 2168 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2169 goto err; 2170 } 2171 2172 pub_key = X509_get_pubkey(peer_cert); 2173 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2174 2175 /* 2176 * If we have send a certificate, and certificate key parameters match 2177 * those of server certificate, use certificate key for key exchange. 2178 * Otherwise, generate ephemeral key pair. 2179 */ 2180 EVP_PKEY_encrypt_init(pkey_ctx); 2181 2182 /* Generate session key. */ 2183 arc4random_buf(premaster_secret, 32); 2184 2185 /* 2186 * If we have client certificate, use its secret as peer key. 2187 */ 2188 if (S3I(s)->hs.tls12.cert_request && s->cert->key->privatekey) { 2189 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2190 s->cert->key->privatekey) <=0) { 2191 /* 2192 * If there was an error - just ignore it. 2193 * Ephemeral key would be used. 2194 */ 2195 ERR_clear_error(); 2196 } 2197 } 2198 2199 /* 2200 * Compute shared IV and store it in algorithm-specific context data. 2201 */ 2202 ukm_hash = EVP_MD_CTX_new(); 2203 if (ukm_hash == NULL) { 2204 SSLerror(s, ERR_R_MALLOC_FAILURE); 2205 goto err; 2206 } 2207 2208 /* XXX check handshake hash instead. */ 2209 if (S3I(s)->hs.cipher->algorithm2 & SSL_HANDSHAKE_MAC_GOST94) 2210 nid = NID_id_GostR3411_94; 2211 else 2212 nid = NID_id_tc26_gost3411_2012_256; 2213 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2214 goto err; 2215 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2216 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2217 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2218 EVP_MD_CTX_free(ukm_hash); 2219 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2220 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2221 SSLerror(s, SSL_R_LIBRARY_BUG); 2222 goto err; 2223 } 2224 2225 /* 2226 * Make GOST keytransport blob message, encapsulate it into sequence. 2227 */ 2228 msglen = 255; 2229 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2230 32) < 0) { 2231 SSLerror(s, SSL_R_LIBRARY_BUG); 2232 goto err; 2233 } 2234 2235 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2236 goto err; 2237 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2238 goto err; 2239 if (!CBB_flush(cbb)) 2240 goto err; 2241 2242 /* Check if pubkey from client certificate was used. */ 2243 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2244 NULL) > 0) { 2245 /* Set flag "skip certificate verify". */ 2246 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2247 } 2248 EVP_PKEY_CTX_free(pkey_ctx); 2249 2250 if (!tls12_derive_master_secret(s, premaster_secret, 32)) 2251 goto err; 2252 2253 ret = 1; 2254 2255 err: 2256 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2257 EVP_PKEY_free(pub_key); 2258 2259 return (ret); 2260 } 2261 2262 int 2263 ssl3_send_client_key_exchange(SSL *s) 2264 { 2265 SESS_CERT *sess_cert; 2266 unsigned long alg_k; 2267 CBB cbb, kex; 2268 2269 memset(&cbb, 0, sizeof(cbb)); 2270 2271 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2272 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2273 2274 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2275 ssl3_send_alert(s, SSL3_AL_FATAL, 2276 SSL_AD_UNEXPECTED_MESSAGE); 2277 SSLerror(s, ERR_R_INTERNAL_ERROR); 2278 goto err; 2279 } 2280 2281 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2282 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2283 goto err; 2284 2285 if (alg_k & SSL_kRSA) { 2286 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2287 goto err; 2288 } else if (alg_k & SSL_kDHE) { 2289 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2290 goto err; 2291 } else if (alg_k & SSL_kECDHE) { 2292 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2293 goto err; 2294 } else if (alg_k & SSL_kGOST) { 2295 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2296 goto err; 2297 } else { 2298 ssl3_send_alert(s, SSL3_AL_FATAL, 2299 SSL_AD_HANDSHAKE_FAILURE); 2300 SSLerror(s, ERR_R_INTERNAL_ERROR); 2301 goto err; 2302 } 2303 2304 if (!ssl3_handshake_msg_finish(s, &cbb)) 2305 goto err; 2306 2307 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2308 } 2309 2310 /* SSL3_ST_CW_KEY_EXCH_B */ 2311 return (ssl3_handshake_write(s)); 2312 2313 err: 2314 CBB_cleanup(&cbb); 2315 2316 return (-1); 2317 } 2318 2319 static int 2320 ssl3_send_client_verify_sigalgs(SSL *s, EVP_PKEY *pkey, 2321 const struct ssl_sigalg *sigalg, CBB *cert_verify) 2322 { 2323 CBB cbb_signature; 2324 EVP_PKEY_CTX *pctx = NULL; 2325 EVP_MD_CTX mctx; 2326 const unsigned char *hdata; 2327 unsigned char *signature = NULL; 2328 size_t signature_len, hdata_len; 2329 int ret = 0; 2330 2331 EVP_MD_CTX_init(&mctx); 2332 2333 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2334 SSLerror(s, ERR_R_INTERNAL_ERROR); 2335 goto err; 2336 } 2337 if (!EVP_DigestSignInit(&mctx, &pctx, sigalg->md(), NULL, pkey)) { 2338 SSLerror(s, ERR_R_EVP_LIB); 2339 goto err; 2340 } 2341 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2342 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2343 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2344 SSLerror(s, ERR_R_EVP_LIB); 2345 goto err; 2346 } 2347 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2348 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2349 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2350 SSLerror(s, ERR_R_EVP_LIB); 2351 goto err; 2352 } 2353 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2354 SSLerror(s, ERR_R_EVP_LIB); 2355 goto err; 2356 } 2357 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2358 signature_len == 0) { 2359 SSLerror(s, ERR_R_EVP_LIB); 2360 goto err; 2361 } 2362 if ((signature = calloc(1, signature_len)) == NULL) { 2363 SSLerror(s, ERR_R_MALLOC_FAILURE); 2364 goto err; 2365 } 2366 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2367 SSLerror(s, ERR_R_EVP_LIB); 2368 goto err; 2369 } 2370 2371 if (!CBB_add_u16(cert_verify, sigalg->value)) 2372 goto err; 2373 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2374 goto err; 2375 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2376 goto err; 2377 if (!CBB_flush(cert_verify)) 2378 goto err; 2379 2380 ret = 1; 2381 2382 err: 2383 EVP_MD_CTX_cleanup(&mctx); 2384 free(signature); 2385 return ret; 2386 } 2387 2388 static int 2389 ssl3_send_client_verify_rsa(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2390 { 2391 CBB cbb_signature; 2392 unsigned char data[EVP_MAX_MD_SIZE]; 2393 unsigned char *signature = NULL; 2394 unsigned int signature_len; 2395 size_t data_len; 2396 int ret = 0; 2397 2398 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2399 goto err; 2400 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2401 goto err; 2402 if (RSA_sign(NID_md5_sha1, data, data_len, signature, 2403 &signature_len, pkey->pkey.rsa) <= 0 ) { 2404 SSLerror(s, ERR_R_RSA_LIB); 2405 goto err; 2406 } 2407 2408 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2409 goto err; 2410 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2411 goto err; 2412 if (!CBB_flush(cert_verify)) 2413 goto err; 2414 2415 ret = 1; 2416 err: 2417 free(signature); 2418 return ret; 2419 } 2420 2421 static int 2422 ssl3_send_client_verify_ec(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2423 { 2424 CBB cbb_signature; 2425 unsigned char data[EVP_MAX_MD_SIZE]; 2426 unsigned char *signature = NULL; 2427 unsigned int signature_len; 2428 int ret = 0; 2429 2430 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2431 goto err; 2432 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2433 goto err; 2434 if (!ECDSA_sign(pkey->save_type, &data[MD5_DIGEST_LENGTH], 2435 SHA_DIGEST_LENGTH, signature, &signature_len, pkey->pkey.ec)) { 2436 SSLerror(s, ERR_R_ECDSA_LIB); 2437 goto err; 2438 } 2439 2440 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2441 goto err; 2442 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2443 goto err; 2444 if (!CBB_flush(cert_verify)) 2445 goto err; 2446 2447 ret = 1; 2448 err: 2449 free(signature); 2450 return ret; 2451 } 2452 2453 #ifndef OPENSSL_NO_GOST 2454 static int 2455 ssl3_send_client_verify_gost(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2456 { 2457 CBB cbb_signature; 2458 EVP_MD_CTX mctx; 2459 EVP_PKEY_CTX *pctx; 2460 const EVP_MD *md; 2461 const unsigned char *hdata; 2462 unsigned char *signature = NULL; 2463 size_t signature_len; 2464 size_t hdata_len; 2465 int nid; 2466 int ret = 0; 2467 2468 EVP_MD_CTX_init(&mctx); 2469 2470 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2471 SSLerror(s, ERR_R_INTERNAL_ERROR); 2472 goto err; 2473 } 2474 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2475 (md = EVP_get_digestbynid(nid)) == NULL) { 2476 SSLerror(s, ERR_R_EVP_LIB); 2477 goto err; 2478 } 2479 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2480 SSLerror(s, ERR_R_EVP_LIB); 2481 goto err; 2482 } 2483 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2484 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2485 SSLerror(s, ERR_R_EVP_LIB); 2486 goto err; 2487 } 2488 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2489 SSLerror(s, ERR_R_EVP_LIB); 2490 goto err; 2491 } 2492 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2493 signature_len == 0) { 2494 SSLerror(s, ERR_R_EVP_LIB); 2495 goto err; 2496 } 2497 if ((signature = calloc(1, signature_len)) == NULL) { 2498 SSLerror(s, ERR_R_MALLOC_FAILURE); 2499 goto err; 2500 } 2501 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2502 SSLerror(s, ERR_R_EVP_LIB); 2503 goto err; 2504 } 2505 2506 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2507 goto err; 2508 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2509 goto err; 2510 if (!CBB_flush(cert_verify)) 2511 goto err; 2512 2513 ret = 1; 2514 err: 2515 EVP_MD_CTX_cleanup(&mctx); 2516 free(signature); 2517 return ret; 2518 } 2519 #endif 2520 2521 int 2522 ssl3_send_client_verify(SSL *s) 2523 { 2524 const struct ssl_sigalg *sigalg; 2525 CBB cbb, cert_verify; 2526 EVP_PKEY *pkey; 2527 2528 memset(&cbb, 0, sizeof(cbb)); 2529 2530 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2531 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2532 SSL3_MT_CERTIFICATE_VERIFY)) 2533 goto err; 2534 2535 pkey = s->cert->key->privatekey; 2536 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2537 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2538 goto err; 2539 } 2540 S3I(s)->hs.our_sigalg = sigalg; 2541 2542 /* 2543 * For TLS v1.2 send signature algorithm and signature using 2544 * agreed digest and cached handshake records. 2545 */ 2546 if (SSL_USE_SIGALGS(s)) { 2547 if (!ssl3_send_client_verify_sigalgs(s, pkey, sigalg, 2548 &cert_verify)) 2549 goto err; 2550 } else if (pkey->type == EVP_PKEY_RSA) { 2551 if (!ssl3_send_client_verify_rsa(s, pkey, &cert_verify)) 2552 goto err; 2553 } else if (pkey->type == EVP_PKEY_EC) { 2554 if (!ssl3_send_client_verify_ec(s, pkey, &cert_verify)) 2555 goto err; 2556 #ifndef OPENSSL_NO_GOST 2557 } else if (pkey->type == NID_id_GostR3410_94 || 2558 pkey->type == NID_id_GostR3410_2001) { 2559 if (!ssl3_send_client_verify_gost(s, pkey, &cert_verify)) 2560 goto err; 2561 #endif 2562 } else { 2563 SSLerror(s, ERR_R_INTERNAL_ERROR); 2564 goto err; 2565 } 2566 2567 tls1_transcript_free(s); 2568 2569 if (!ssl3_handshake_msg_finish(s, &cbb)) 2570 goto err; 2571 2572 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2573 } 2574 2575 return (ssl3_handshake_write(s)); 2576 2577 err: 2578 CBB_cleanup(&cbb); 2579 2580 return (-1); 2581 } 2582 2583 int 2584 ssl3_send_client_certificate(SSL *s) 2585 { 2586 EVP_PKEY *pkey = NULL; 2587 X509 *x509 = NULL; 2588 CBB cbb, client_cert; 2589 int i; 2590 2591 memset(&cbb, 0, sizeof(cbb)); 2592 2593 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2594 if (s->cert->key->x509 == NULL || 2595 s->cert->key->privatekey == NULL) 2596 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2597 else 2598 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2599 } 2600 2601 /* We need to get a client cert */ 2602 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2603 /* 2604 * If we get an error, we need to 2605 * ssl->internal->rwstate = SSL_X509_LOOKUP; return(-1); 2606 * We then get retried later. 2607 */ 2608 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2609 if (i < 0) { 2610 s->internal->rwstate = SSL_X509_LOOKUP; 2611 return (-1); 2612 } 2613 s->internal->rwstate = SSL_NOTHING; 2614 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2615 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2616 if (!SSL_use_certificate(s, x509) || 2617 !SSL_use_PrivateKey(s, pkey)) 2618 i = 0; 2619 } else if (i == 1) { 2620 i = 0; 2621 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2622 } 2623 2624 X509_free(x509); 2625 EVP_PKEY_free(pkey); 2626 if (i == 0) { 2627 S3I(s)->hs.tls12.cert_request = 2; 2628 2629 /* There is no client certificate to verify. */ 2630 tls1_transcript_free(s); 2631 } 2632 2633 /* Ok, we have a cert */ 2634 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2635 } 2636 2637 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2638 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2639 SSL3_MT_CERTIFICATE)) 2640 goto err; 2641 if (!ssl3_output_cert_chain(s, &client_cert, 2642 (S3I(s)->hs.tls12.cert_request == 2) ? NULL : s->cert->key)) 2643 goto err; 2644 if (!ssl3_handshake_msg_finish(s, &cbb)) 2645 goto err; 2646 2647 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2648 } 2649 2650 /* SSL3_ST_CW_CERT_D */ 2651 return (ssl3_handshake_write(s)); 2652 2653 err: 2654 CBB_cleanup(&cbb); 2655 2656 return (0); 2657 } 2658 2659 #define has_bits(i,m) (((i)&(m)) == (m)) 2660 2661 int 2662 ssl3_check_cert_and_algorithm(SSL *s) 2663 { 2664 int i, idx; 2665 long alg_k, alg_a; 2666 EVP_PKEY *pkey = NULL; 2667 SESS_CERT *sc; 2668 DH *dh; 2669 2670 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2671 alg_a = S3I(s)->hs.cipher->algorithm_auth; 2672 2673 /* We don't have a certificate. */ 2674 if (alg_a & SSL_aNULL) 2675 return (1); 2676 2677 sc = SSI(s)->sess_cert; 2678 if (sc == NULL) { 2679 SSLerror(s, ERR_R_INTERNAL_ERROR); 2680 goto err; 2681 } 2682 dh = SSI(s)->sess_cert->peer_dh_tmp; 2683 2684 /* This is the passed certificate. */ 2685 2686 idx = sc->peer_cert_type; 2687 if (idx == SSL_PKEY_ECC) { 2688 if (ssl_check_srvr_ecc_cert_and_alg( 2689 sc->peer_pkeys[idx].x509, s) == 0) { 2690 /* check failed */ 2691 SSLerror(s, SSL_R_BAD_ECC_CERT); 2692 goto fatal_err; 2693 } else { 2694 return (1); 2695 } 2696 } 2697 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2698 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2699 EVP_PKEY_free(pkey); 2700 2701 /* Check that we have a certificate if we require one. */ 2702 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2703 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2704 goto fatal_err; 2705 } 2706 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2707 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2708 goto fatal_err; 2709 } 2710 if ((alg_k & SSL_kDHE) && 2711 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2712 SSLerror(s, SSL_R_MISSING_DH_KEY); 2713 goto fatal_err; 2714 } 2715 2716 return (1); 2717 fatal_err: 2718 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2719 err: 2720 return (0); 2721 } 2722 2723 /* 2724 * Check to see if handshake is full or resumed. Usually this is just a 2725 * case of checking to see if a cache hit has occurred. In the case of 2726 * session tickets we have to check the next message to be sure. 2727 */ 2728 2729 int 2730 ssl3_check_finished(SSL *s) 2731 { 2732 int ok; 2733 long n; 2734 2735 /* If we have no ticket it cannot be a resumed session. */ 2736 if (!s->session->tlsext_tick) 2737 return (1); 2738 /* this function is called when we really expect a Certificate 2739 * message, so permit appropriate message length */ 2740 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2741 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2742 if (!ok) 2743 return ((int)n); 2744 2745 S3I(s)->hs.tls12.reuse_message = 1; 2746 if ((S3I(s)->hs.tls12.message_type == SSL3_MT_FINISHED) || 2747 (S3I(s)->hs.tls12.message_type == SSL3_MT_NEWSESSION_TICKET)) 2748 return (2); 2749 2750 return (1); 2751 } 2752 2753 int 2754 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2755 { 2756 int i = 0; 2757 2758 #ifndef OPENSSL_NO_ENGINE 2759 if (s->ctx->internal->client_cert_engine) { 2760 i = ENGINE_load_ssl_client_cert( 2761 s->ctx->internal->client_cert_engine, s, 2762 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2763 if (i != 0) 2764 return (i); 2765 } 2766 #endif 2767 if (s->ctx->internal->client_cert_cb) 2768 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2769 return (i); 2770 } 2771