1 /* $OpenBSD: ssl_clnt.c,v 1.99 2021/05/16 14:10:43 jsing Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 /* ==================================================================== 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 /* ==================================================================== 112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 113 * 114 * Portions of the attached software ("Contribution") are developed by 115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 116 * 117 * The Contribution is licensed pursuant to the OpenSSL open source 118 * license provided above. 119 * 120 * ECC cipher suite support in OpenSSL originally written by 121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. 122 * 123 */ 124 /* ==================================================================== 125 * Copyright 2005 Nokia. All rights reserved. 126 * 127 * The portions of the attached software ("Contribution") is developed by 128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 129 * license. 130 * 131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 133 * support (see RFC 4279) to OpenSSL. 134 * 135 * No patent licenses or other rights except those expressly stated in 136 * the OpenSSL open source license shall be deemed granted or received 137 * expressly, by implication, estoppel, or otherwise. 138 * 139 * No assurances are provided by Nokia that the Contribution does not 140 * infringe the patent or other intellectual property rights of any third 141 * party or that the license provides you with all the necessary rights 142 * to make use of the Contribution. 143 * 144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 148 * OTHERWISE. 149 */ 150 151 #include <limits.h> 152 #include <stdint.h> 153 #include <stdio.h> 154 155 #include <openssl/bn.h> 156 #include <openssl/buffer.h> 157 #include <openssl/curve25519.h> 158 #include <openssl/dh.h> 159 #include <openssl/evp.h> 160 #include <openssl/md5.h> 161 #include <openssl/objects.h> 162 #include <openssl/opensslconf.h> 163 164 #ifndef OPENSSL_NO_ENGINE 165 #include <openssl/engine.h> 166 #endif 167 #ifndef OPENSSL_NO_GOST 168 #include <openssl/gost.h> 169 #endif 170 171 #include "bytestring.h" 172 #include "dtls_locl.h" 173 #include "ssl_locl.h" 174 #include "ssl_sigalgs.h" 175 #include "ssl_tlsext.h" 176 177 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b); 178 179 int 180 ssl3_connect(SSL *s) 181 { 182 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 const EVP_MD *md = NULL; 1469 EVP_PKEY *pkey = NULL; 1470 EVP_MD_CTX md_ctx; 1471 const unsigned char *param; 1472 long n, alg_k, alg_a; 1473 int al, ok; 1474 size_t param_len; 1475 1476 EVP_MD_CTX_init(&md_ctx); 1477 1478 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 1479 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1480 1481 /* 1482 * Use same message size as in ssl3_get_certificate_request() 1483 * as ServerKeyExchange message may be skipped. 1484 */ 1485 n = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1486 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1487 if (!ok) 1488 return ((int)n); 1489 1490 if (n < 0) 1491 goto err; 1492 1493 CBS_init(&cbs, s->internal->init_msg, n); 1494 1495 if (S3I(s)->hs.tls12.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1496 /* 1497 * Do not skip server key exchange if this cipher suite uses 1498 * ephemeral keys. 1499 */ 1500 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1501 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1502 al = SSL_AD_UNEXPECTED_MESSAGE; 1503 goto fatal_err; 1504 } 1505 1506 S3I(s)->hs.tls12.reuse_message = 1; 1507 EVP_MD_CTX_cleanup(&md_ctx); 1508 return (1); 1509 } 1510 1511 if (SSI(s)->sess_cert != NULL) { 1512 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1513 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1514 1515 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1516 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1517 1518 free(SSI(s)->sess_cert->peer_x25519_tmp); 1519 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1520 } else { 1521 SSI(s)->sess_cert = ssl_sess_cert_new(); 1522 if (SSI(s)->sess_cert == NULL) 1523 goto err; 1524 } 1525 1526 param = CBS_data(&cbs); 1527 param_len = CBS_len(&cbs); 1528 1529 if (alg_k & SSL_kDHE) { 1530 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1) 1531 goto err; 1532 } else if (alg_k & SSL_kECDHE) { 1533 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1) 1534 goto err; 1535 } else if (alg_k != 0) { 1536 al = SSL_AD_UNEXPECTED_MESSAGE; 1537 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1538 goto fatal_err; 1539 } 1540 1541 param_len -= CBS_len(&cbs); 1542 1543 /* if it was signed, check the signature */ 1544 if (pkey != NULL) { 1545 EVP_PKEY_CTX *pctx; 1546 const struct ssl_sigalg *sigalg; 1547 1548 if (SSL_USE_SIGALGS(s)) { 1549 uint16_t sigalg_value; 1550 1551 if (!CBS_get_u16(&cbs, &sigalg_value)) 1552 goto decode_err; 1553 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, 1554 tls12_sigalgs_len)) == NULL) { 1555 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1556 al = SSL_AD_DECODE_ERROR; 1557 goto fatal_err; 1558 } 1559 if ((md = sigalg->md()) == NULL) { 1560 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1561 al = SSL_AD_DECODE_ERROR; 1562 goto fatal_err; 1563 } 1564 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) { 1565 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 1566 al = SSL_AD_DECODE_ERROR; 1567 goto fatal_err; 1568 } 1569 } else if (pkey->type == EVP_PKEY_RSA) { 1570 sigalg = ssl_sigalg_lookup(SIGALG_RSA_PKCS1_MD5_SHA1); 1571 } else if (pkey->type == EVP_PKEY_EC) { 1572 sigalg = ssl_sigalg_lookup(SIGALG_ECDSA_SHA1); 1573 } else { 1574 SSLerror(s, SSL_R_UNKNOWN_PKEY_TYPE); 1575 al = SSL_AD_DECODE_ERROR; 1576 goto fatal_err; 1577 } 1578 md = sigalg->md(); 1579 1580 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1581 goto decode_err; 1582 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1583 al = SSL_AD_DECODE_ERROR; 1584 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1585 goto fatal_err; 1586 } 1587 1588 if (!EVP_DigestVerifyInit(&md_ctx, &pctx, md, NULL, pkey)) 1589 goto err; 1590 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->client_random, 1591 SSL3_RANDOM_SIZE)) 1592 goto err; 1593 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1594 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1595 RSA_PKCS1_PSS_PADDING) || 1596 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1597 goto err; 1598 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->server_random, 1599 SSL3_RANDOM_SIZE)) 1600 goto err; 1601 if (!EVP_DigestVerifyUpdate(&md_ctx, param, param_len)) 1602 goto err; 1603 if (EVP_DigestVerifyFinal(&md_ctx, CBS_data(&signature), 1604 CBS_len(&signature)) <= 0) { 1605 al = SSL_AD_DECRYPT_ERROR; 1606 SSLerror(s, SSL_R_BAD_SIGNATURE); 1607 goto fatal_err; 1608 } 1609 } else { 1610 /* aNULL does not need public keys. */ 1611 if (!(alg_a & SSL_aNULL)) { 1612 SSLerror(s, ERR_R_INTERNAL_ERROR); 1613 goto err; 1614 } 1615 } 1616 1617 if (CBS_len(&cbs) != 0) { 1618 al = SSL_AD_DECODE_ERROR; 1619 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1620 goto fatal_err; 1621 } 1622 1623 EVP_PKEY_free(pkey); 1624 EVP_MD_CTX_cleanup(&md_ctx); 1625 1626 return (1); 1627 1628 decode_err: 1629 al = SSL_AD_DECODE_ERROR; 1630 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1631 1632 fatal_err: 1633 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1634 1635 err: 1636 EVP_PKEY_free(pkey); 1637 EVP_MD_CTX_cleanup(&md_ctx); 1638 1639 return (-1); 1640 } 1641 1642 int 1643 ssl3_get_certificate_request(SSL *s) 1644 { 1645 int ok, ret = 0; 1646 long n; 1647 CBS cert_request, cert_types, rdn_list; 1648 X509_NAME *xn = NULL; 1649 const unsigned char *q; 1650 STACK_OF(X509_NAME) *ca_sk = NULL; 1651 1652 n = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1653 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1654 if (!ok) 1655 return ((int)n); 1656 1657 S3I(s)->hs.tls12.cert_request = 0; 1658 1659 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_DONE) { 1660 S3I(s)->hs.tls12.reuse_message = 1; 1661 /* 1662 * If we get here we don't need any cached handshake records 1663 * as we wont be doing client auth. 1664 */ 1665 tls1_transcript_free(s); 1666 return (1); 1667 } 1668 1669 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1670 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1671 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1672 goto err; 1673 } 1674 1675 /* TLS does not like anon-DH with client cert */ 1676 if (S3I(s)->hs.cipher->algorithm_auth & SSL_aNULL) { 1677 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1678 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1679 goto err; 1680 } 1681 1682 if (n < 0) 1683 goto decode_err; 1684 CBS_init(&cert_request, s->internal->init_msg, n); 1685 1686 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1687 SSLerror(s, ERR_R_MALLOC_FAILURE); 1688 goto err; 1689 } 1690 1691 if (!CBS_get_u8_length_prefixed(&cert_request, &cert_types)) 1692 goto decode_err; 1693 1694 if (SSL_USE_SIGALGS(s)) { 1695 CBS sigalgs; 1696 1697 if (CBS_len(&cert_request) < 2) { 1698 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1699 goto err; 1700 } 1701 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1702 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1703 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1704 goto err; 1705 } 1706 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1707 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1708 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1709 goto err; 1710 } 1711 if (!CBS_stow(&sigalgs, &S3I(s)->hs.sigalgs, 1712 &S3I(s)->hs.sigalgs_len)) 1713 goto err; 1714 } 1715 1716 /* get the CA RDNs */ 1717 if (CBS_len(&cert_request) < 2) { 1718 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1719 goto err; 1720 } 1721 1722 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1723 CBS_len(&cert_request) != 0) { 1724 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1725 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1726 goto err; 1727 } 1728 1729 while (CBS_len(&rdn_list) > 0) { 1730 CBS rdn; 1731 1732 if (CBS_len(&rdn_list) < 2) { 1733 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1734 goto err; 1735 } 1736 1737 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1738 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1739 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1740 goto err; 1741 } 1742 1743 q = CBS_data(&rdn); 1744 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1745 ssl3_send_alert(s, SSL3_AL_FATAL, 1746 SSL_AD_DECODE_ERROR); 1747 SSLerror(s, ERR_R_ASN1_LIB); 1748 goto err; 1749 } 1750 1751 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1752 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1753 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1754 goto err; 1755 } 1756 if (!sk_X509_NAME_push(ca_sk, xn)) { 1757 SSLerror(s, ERR_R_MALLOC_FAILURE); 1758 goto err; 1759 } 1760 xn = NULL; /* avoid free in err block */ 1761 } 1762 1763 /* we should setup a certificate to return.... */ 1764 S3I(s)->hs.tls12.cert_request = 1; 1765 sk_X509_NAME_pop_free(S3I(s)->hs.tls12.ca_names, X509_NAME_free); 1766 S3I(s)->hs.tls12.ca_names = ca_sk; 1767 ca_sk = NULL; 1768 1769 ret = 1; 1770 if (0) { 1771 decode_err: 1772 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1773 } 1774 err: 1775 X509_NAME_free(xn); 1776 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1777 return (ret); 1778 } 1779 1780 static int 1781 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1782 { 1783 return (X509_NAME_cmp(*a, *b)); 1784 } 1785 1786 int 1787 ssl3_get_new_session_ticket(SSL *s) 1788 { 1789 int ok, al, ret = 0; 1790 uint32_t lifetime_hint; 1791 long n; 1792 CBS cbs, session_ticket; 1793 1794 n = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1795 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1796 if (!ok) 1797 return ((int)n); 1798 1799 if (S3I(s)->hs.tls12.message_type == SSL3_MT_FINISHED) { 1800 S3I(s)->hs.tls12.reuse_message = 1; 1801 return (1); 1802 } 1803 if (S3I(s)->hs.tls12.message_type != SSL3_MT_NEWSESSION_TICKET) { 1804 al = SSL_AD_UNEXPECTED_MESSAGE; 1805 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1806 goto fatal_err; 1807 } 1808 1809 if (n < 0) { 1810 al = SSL_AD_DECODE_ERROR; 1811 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1812 goto fatal_err; 1813 } 1814 1815 CBS_init(&cbs, s->internal->init_msg, n); 1816 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1817 #if UINT32_MAX > LONG_MAX 1818 lifetime_hint > LONG_MAX || 1819 #endif 1820 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1821 CBS_len(&cbs) != 0) { 1822 al = SSL_AD_DECODE_ERROR; 1823 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1824 goto fatal_err; 1825 } 1826 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1827 1828 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1829 &s->session->tlsext_ticklen)) { 1830 SSLerror(s, ERR_R_MALLOC_FAILURE); 1831 goto err; 1832 } 1833 1834 /* 1835 * There are two ways to detect a resumed ticket sesion. 1836 * One is to set an appropriate session ID and then the server 1837 * must return a match in ServerHello. This allows the normal 1838 * client session ID matching to work and we know much 1839 * earlier that the ticket has been accepted. 1840 * 1841 * The other way is to set zero length session ID when the 1842 * ticket is presented and rely on the handshake to determine 1843 * session resumption. 1844 * 1845 * We choose the former approach because this fits in with 1846 * assumptions elsewhere in OpenSSL. The session ID is set 1847 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1848 * ticket. 1849 */ 1850 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1851 s->session->session_id, &s->session->session_id_length, 1852 EVP_sha256(), NULL); 1853 ret = 1; 1854 return (ret); 1855 fatal_err: 1856 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1857 err: 1858 return (-1); 1859 } 1860 1861 int 1862 ssl3_get_cert_status(SSL *s) 1863 { 1864 CBS cert_status, response; 1865 int ok, al; 1866 long n; 1867 uint8_t status_type; 1868 1869 n = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1870 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 1871 16384, &ok); 1872 if (!ok) 1873 return ((int)n); 1874 1875 if (n < 0) { 1876 /* need at least status type + length */ 1877 al = SSL_AD_DECODE_ERROR; 1878 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1879 goto fatal_err; 1880 } 1881 1882 CBS_init(&cert_status, s->internal->init_msg, n); 1883 if (!CBS_get_u8(&cert_status, &status_type) || 1884 CBS_len(&cert_status) < 3) { 1885 /* need at least status type + length */ 1886 al = SSL_AD_DECODE_ERROR; 1887 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1888 goto fatal_err; 1889 } 1890 1891 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1892 al = SSL_AD_DECODE_ERROR; 1893 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1894 goto fatal_err; 1895 } 1896 1897 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1898 CBS_len(&cert_status) != 0) { 1899 al = SSL_AD_DECODE_ERROR; 1900 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1901 goto fatal_err; 1902 } 1903 1904 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1905 &s->internal->tlsext_ocsp_resp_len)) { 1906 al = SSL_AD_INTERNAL_ERROR; 1907 SSLerror(s, ERR_R_MALLOC_FAILURE); 1908 goto fatal_err; 1909 } 1910 1911 if (s->ctx->internal->tlsext_status_cb) { 1912 int ret; 1913 ret = s->ctx->internal->tlsext_status_cb(s, 1914 s->ctx->internal->tlsext_status_arg); 1915 if (ret == 0) { 1916 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1917 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1918 goto fatal_err; 1919 } 1920 if (ret < 0) { 1921 al = SSL_AD_INTERNAL_ERROR; 1922 SSLerror(s, ERR_R_MALLOC_FAILURE); 1923 goto fatal_err; 1924 } 1925 } 1926 return (1); 1927 fatal_err: 1928 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1929 return (-1); 1930 } 1931 1932 int 1933 ssl3_get_server_done(SSL *s) 1934 { 1935 int ok, ret = 0; 1936 long n; 1937 1938 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1939 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1940 30, /* should be very small, like 0 :-) */ &ok); 1941 if (!ok) 1942 return ((int)n); 1943 1944 if (n > 0) { 1945 /* should contain no data */ 1946 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1947 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1948 return (-1); 1949 } 1950 ret = 1; 1951 return (ret); 1952 } 1953 1954 static int 1955 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1956 { 1957 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1958 unsigned char *enc_pms = NULL; 1959 EVP_PKEY *pkey = NULL; 1960 int ret = -1; 1961 int enc_len; 1962 CBB epms; 1963 1964 /* 1965 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1966 */ 1967 1968 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA].x509); 1969 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1970 pkey->pkey.rsa == NULL) { 1971 SSLerror(s, ERR_R_INTERNAL_ERROR); 1972 goto err; 1973 } 1974 1975 /* XXX - our max protocol version. */ 1976 pms[0] = s->client_version >> 8; 1977 pms[1] = s->client_version & 0xff; 1978 arc4random_buf(&pms[2], sizeof(pms) - 2); 1979 1980 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1981 SSLerror(s, ERR_R_MALLOC_FAILURE); 1982 goto err; 1983 } 1984 1985 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 1986 RSA_PKCS1_PADDING); 1987 if (enc_len <= 0) { 1988 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1989 goto err; 1990 } 1991 1992 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1993 goto err; 1994 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 1995 goto err; 1996 if (!CBB_flush(cbb)) 1997 goto err; 1998 1999 if (!tls12_derive_master_secret(s, pms, sizeof(pms))) 2000 goto err; 2001 2002 ret = 1; 2003 2004 err: 2005 explicit_bzero(pms, sizeof(pms)); 2006 EVP_PKEY_free(pkey); 2007 free(enc_pms); 2008 2009 return (ret); 2010 } 2011 2012 static int 2013 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2014 { 2015 DH *dh_srvr = NULL, *dh_clnt = NULL; 2016 unsigned char *key = NULL; 2017 int key_size = 0, key_len; 2018 unsigned char *data; 2019 int ret = -1; 2020 CBB dh_Yc; 2021 2022 /* Ensure that we have an ephemeral key for DHE. */ 2023 if (sess_cert->peer_dh_tmp == NULL) { 2024 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2025 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 2026 goto err; 2027 } 2028 dh_srvr = sess_cert->peer_dh_tmp; 2029 2030 /* Generate a new random key. */ 2031 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2032 SSLerror(s, ERR_R_DH_LIB); 2033 goto err; 2034 } 2035 if (!DH_generate_key(dh_clnt)) { 2036 SSLerror(s, ERR_R_DH_LIB); 2037 goto err; 2038 } 2039 if ((key_size = DH_size(dh_clnt)) <= 0) { 2040 SSLerror(s, ERR_R_DH_LIB); 2041 goto err; 2042 } 2043 if ((key = malloc(key_size)) == NULL) { 2044 SSLerror(s, ERR_R_MALLOC_FAILURE); 2045 goto err; 2046 } 2047 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) { 2048 SSLerror(s, ERR_R_DH_LIB); 2049 goto err; 2050 } 2051 2052 if (!tls12_derive_master_secret(s, key, key_len)) 2053 goto err; 2054 2055 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2056 goto err; 2057 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2058 goto err; 2059 BN_bn2bin(dh_clnt->pub_key, data); 2060 if (!CBB_flush(cbb)) 2061 goto err; 2062 2063 ret = 1; 2064 2065 err: 2066 DH_free(dh_clnt); 2067 freezero(key, key_size); 2068 2069 return (ret); 2070 } 2071 2072 static int 2073 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2074 { 2075 EC_KEY *ecdh = NULL; 2076 uint8_t *key = NULL; 2077 size_t key_len = 0; 2078 int ret = -1; 2079 CBB ecpoint; 2080 2081 if ((ecdh = EC_KEY_new()) == NULL) { 2082 SSLerror(s, ERR_R_MALLOC_FAILURE); 2083 goto err; 2084 } 2085 2086 if (!ssl_kex_generate_ecdhe_ecp(ecdh, sc->peer_nid)) 2087 goto err; 2088 2089 /* Encode our public key. */ 2090 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2091 goto err; 2092 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 2093 goto err; 2094 if (!CBB_flush(cbb)) 2095 goto err; 2096 2097 if (!ssl_kex_derive_ecdhe_ecp(ecdh, sc->peer_ecdh_tmp, &key, &key_len)) 2098 goto err; 2099 if (!tls12_derive_master_secret(s, key, key_len)) 2100 goto err; 2101 2102 ret = 1; 2103 2104 err: 2105 freezero(key, key_len); 2106 EC_KEY_free(ecdh); 2107 2108 return (ret); 2109 } 2110 2111 static int 2112 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2113 { 2114 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2115 int ret = -1; 2116 CBB ecpoint; 2117 2118 /* Generate X25519 key pair and derive shared key. */ 2119 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2120 goto err; 2121 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2122 goto err; 2123 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2124 goto err; 2125 X25519_keypair(public_key, private_key); 2126 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2127 goto err; 2128 2129 /* Serialize the public key. */ 2130 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2131 goto err; 2132 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2133 goto err; 2134 if (!CBB_flush(cbb)) 2135 goto err; 2136 2137 if (!tls12_derive_master_secret(s, shared_key, X25519_KEY_LENGTH)) 2138 goto err; 2139 2140 ret = 1; 2141 2142 err: 2143 free(public_key); 2144 freezero(private_key, X25519_KEY_LENGTH); 2145 freezero(shared_key, X25519_KEY_LENGTH); 2146 2147 return (ret); 2148 } 2149 2150 static int 2151 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2152 { 2153 if (sc->peer_x25519_tmp != NULL) { 2154 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2155 goto err; 2156 } else if (sc->peer_ecdh_tmp != NULL) { 2157 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2158 goto err; 2159 } else { 2160 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2161 SSLerror(s, ERR_R_INTERNAL_ERROR); 2162 goto err; 2163 } 2164 2165 return (1); 2166 2167 err: 2168 return (-1); 2169 } 2170 2171 static int 2172 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2173 { 2174 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2175 EVP_PKEY *pub_key = NULL; 2176 EVP_PKEY_CTX *pkey_ctx; 2177 X509 *peer_cert; 2178 size_t msglen; 2179 unsigned int md_len; 2180 EVP_MD_CTX *ukm_hash; 2181 int ret = -1; 2182 int nid; 2183 CBB gostblob; 2184 2185 /* Get server sertificate PKEY and create ctx from it */ 2186 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2187 if (peer_cert == NULL) { 2188 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2189 goto err; 2190 } 2191 2192 pub_key = X509_get_pubkey(peer_cert); 2193 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2194 2195 /* 2196 * If we have send a certificate, and certificate key parameters match 2197 * those of server certificate, use certificate key for key exchange. 2198 * Otherwise, generate ephemeral key pair. 2199 */ 2200 EVP_PKEY_encrypt_init(pkey_ctx); 2201 2202 /* Generate session key. */ 2203 arc4random_buf(premaster_secret, 32); 2204 2205 /* 2206 * If we have client certificate, use its secret as peer key. 2207 */ 2208 if (S3I(s)->hs.tls12.cert_request && s->cert->key->privatekey) { 2209 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2210 s->cert->key->privatekey) <=0) { 2211 /* 2212 * If there was an error - just ignore it. 2213 * Ephemeral key would be used. 2214 */ 2215 ERR_clear_error(); 2216 } 2217 } 2218 2219 /* 2220 * Compute shared IV and store it in algorithm-specific context data. 2221 */ 2222 ukm_hash = EVP_MD_CTX_new(); 2223 if (ukm_hash == NULL) { 2224 SSLerror(s, ERR_R_MALLOC_FAILURE); 2225 goto err; 2226 } 2227 2228 /* XXX check handshake hash instead. */ 2229 if (S3I(s)->hs.cipher->algorithm2 & SSL_HANDSHAKE_MAC_GOST94) 2230 nid = NID_id_GostR3411_94; 2231 else 2232 nid = NID_id_tc26_gost3411_2012_256; 2233 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2234 goto err; 2235 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2236 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2237 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2238 EVP_MD_CTX_free(ukm_hash); 2239 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2240 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2241 SSLerror(s, SSL_R_LIBRARY_BUG); 2242 goto err; 2243 } 2244 2245 /* 2246 * Make GOST keytransport blob message, encapsulate it into sequence. 2247 */ 2248 msglen = 255; 2249 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2250 32) < 0) { 2251 SSLerror(s, SSL_R_LIBRARY_BUG); 2252 goto err; 2253 } 2254 2255 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2256 goto err; 2257 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2258 goto err; 2259 if (!CBB_flush(cbb)) 2260 goto err; 2261 2262 /* Check if pubkey from client certificate was used. */ 2263 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2264 NULL) > 0) { 2265 /* Set flag "skip certificate verify". */ 2266 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2267 } 2268 EVP_PKEY_CTX_free(pkey_ctx); 2269 2270 if (!tls12_derive_master_secret(s, premaster_secret, 32)) 2271 goto err; 2272 2273 ret = 1; 2274 2275 err: 2276 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2277 EVP_PKEY_free(pub_key); 2278 2279 return (ret); 2280 } 2281 2282 int 2283 ssl3_send_client_key_exchange(SSL *s) 2284 { 2285 SESS_CERT *sess_cert; 2286 unsigned long alg_k; 2287 CBB cbb, kex; 2288 2289 memset(&cbb, 0, sizeof(cbb)); 2290 2291 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2292 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2293 2294 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2295 ssl3_send_alert(s, SSL3_AL_FATAL, 2296 SSL_AD_UNEXPECTED_MESSAGE); 2297 SSLerror(s, ERR_R_INTERNAL_ERROR); 2298 goto err; 2299 } 2300 2301 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2302 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2303 goto err; 2304 2305 if (alg_k & SSL_kRSA) { 2306 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2307 goto err; 2308 } else if (alg_k & SSL_kDHE) { 2309 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2310 goto err; 2311 } else if (alg_k & SSL_kECDHE) { 2312 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2313 goto err; 2314 } else if (alg_k & SSL_kGOST) { 2315 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2316 goto err; 2317 } else { 2318 ssl3_send_alert(s, SSL3_AL_FATAL, 2319 SSL_AD_HANDSHAKE_FAILURE); 2320 SSLerror(s, ERR_R_INTERNAL_ERROR); 2321 goto err; 2322 } 2323 2324 if (!ssl3_handshake_msg_finish(s, &cbb)) 2325 goto err; 2326 2327 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2328 } 2329 2330 /* SSL3_ST_CW_KEY_EXCH_B */ 2331 return (ssl3_handshake_write(s)); 2332 2333 err: 2334 CBB_cleanup(&cbb); 2335 2336 return (-1); 2337 } 2338 2339 static int 2340 ssl3_send_client_verify_sigalgs(SSL *s, CBB *cert_verify) 2341 { 2342 const struct ssl_sigalg *sigalg; 2343 CBB cbb_signature; 2344 EVP_PKEY_CTX *pctx = NULL; 2345 EVP_PKEY *pkey; 2346 EVP_MD_CTX mctx; 2347 const EVP_MD *md; 2348 const unsigned char *hdata; 2349 unsigned char *signature = NULL; 2350 size_t signature_len, hdata_len; 2351 int ret = 0; 2352 2353 EVP_MD_CTX_init(&mctx); 2354 2355 pkey = s->cert->key->privatekey; 2356 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2357 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2358 goto err; 2359 } 2360 if ((md = sigalg->md()) == NULL) { 2361 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 2362 goto err; 2363 } 2364 2365 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2366 SSLerror(s, ERR_R_INTERNAL_ERROR); 2367 goto err; 2368 } 2369 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2370 SSLerror(s, ERR_R_EVP_LIB); 2371 goto err; 2372 } 2373 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2374 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2375 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2376 SSLerror(s, ERR_R_EVP_LIB); 2377 goto err; 2378 } 2379 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2380 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2381 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2382 SSLerror(s, ERR_R_EVP_LIB); 2383 goto err; 2384 } 2385 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2386 SSLerror(s, ERR_R_EVP_LIB); 2387 goto err; 2388 } 2389 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2390 signature_len == 0) { 2391 SSLerror(s, ERR_R_EVP_LIB); 2392 goto err; 2393 } 2394 if ((signature = calloc(1, signature_len)) == NULL) { 2395 SSLerror(s, ERR_R_MALLOC_FAILURE); 2396 goto err; 2397 } 2398 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2399 SSLerror(s, ERR_R_EVP_LIB); 2400 goto err; 2401 } 2402 2403 if (!CBB_add_u16(cert_verify, sigalg->value)) 2404 goto err; 2405 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2406 goto err; 2407 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2408 goto err; 2409 if (!CBB_flush(cert_verify)) 2410 goto err; 2411 2412 ret = 1; 2413 2414 err: 2415 EVP_MD_CTX_cleanup(&mctx); 2416 free(signature); 2417 return ret; 2418 } 2419 2420 static int 2421 ssl3_send_client_verify_rsa(SSL *s, CBB *cert_verify) 2422 { 2423 CBB cbb_signature; 2424 EVP_PKEY *pkey; 2425 unsigned char data[EVP_MAX_MD_SIZE]; 2426 unsigned char *signature = NULL; 2427 unsigned int signature_len; 2428 size_t data_len; 2429 int ret = 0; 2430 2431 pkey = s->cert->key->privatekey; 2432 2433 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2434 goto err; 2435 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2436 goto err; 2437 if (RSA_sign(NID_md5_sha1, data, data_len, signature, 2438 &signature_len, pkey->pkey.rsa) <= 0 ) { 2439 SSLerror(s, ERR_R_RSA_LIB); 2440 goto err; 2441 } 2442 2443 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2444 goto err; 2445 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2446 goto err; 2447 if (!CBB_flush(cert_verify)) 2448 goto err; 2449 2450 ret = 1; 2451 err: 2452 free(signature); 2453 return ret; 2454 } 2455 2456 static int 2457 ssl3_send_client_verify_ec(SSL *s, CBB *cert_verify) 2458 { 2459 CBB cbb_signature; 2460 EVP_PKEY *pkey; 2461 unsigned char data[EVP_MAX_MD_SIZE]; 2462 unsigned char *signature = NULL; 2463 unsigned int signature_len; 2464 int ret = 0; 2465 2466 pkey = s->cert->key->privatekey; 2467 2468 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2469 goto err; 2470 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2471 goto err; 2472 if (!ECDSA_sign(pkey->save_type, &data[MD5_DIGEST_LENGTH], 2473 SHA_DIGEST_LENGTH, signature, &signature_len, pkey->pkey.ec)) { 2474 SSLerror(s, ERR_R_ECDSA_LIB); 2475 goto err; 2476 } 2477 2478 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2479 goto err; 2480 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2481 goto err; 2482 if (!CBB_flush(cert_verify)) 2483 goto err; 2484 2485 ret = 1; 2486 err: 2487 free(signature); 2488 return ret; 2489 } 2490 2491 #ifndef OPENSSL_NO_GOST 2492 static int 2493 ssl3_send_client_verify_gost(SSL *s, CBB *cert_verify) 2494 { 2495 CBB cbb_signature; 2496 EVP_MD_CTX mctx; 2497 EVP_PKEY_CTX *pctx; 2498 EVP_PKEY *pkey; 2499 const EVP_MD *md; 2500 const unsigned char *hdata; 2501 unsigned char *signature = NULL; 2502 size_t signature_len; 2503 size_t hdata_len; 2504 int nid; 2505 int ret = 0; 2506 2507 EVP_MD_CTX_init(&mctx); 2508 2509 pkey = s->cert->key->privatekey; 2510 2511 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2512 SSLerror(s, ERR_R_INTERNAL_ERROR); 2513 goto err; 2514 } 2515 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2516 (md = EVP_get_digestbynid(nid)) == NULL) { 2517 SSLerror(s, ERR_R_EVP_LIB); 2518 goto err; 2519 } 2520 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2521 SSLerror(s, ERR_R_EVP_LIB); 2522 goto err; 2523 } 2524 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2525 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2526 SSLerror(s, ERR_R_EVP_LIB); 2527 goto err; 2528 } 2529 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2530 SSLerror(s, ERR_R_EVP_LIB); 2531 goto err; 2532 } 2533 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2534 signature_len == 0) { 2535 SSLerror(s, ERR_R_EVP_LIB); 2536 goto err; 2537 } 2538 if ((signature = calloc(1, signature_len)) == NULL) { 2539 SSLerror(s, ERR_R_MALLOC_FAILURE); 2540 goto err; 2541 } 2542 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2543 SSLerror(s, ERR_R_EVP_LIB); 2544 goto err; 2545 } 2546 2547 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2548 goto err; 2549 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2550 goto err; 2551 if (!CBB_flush(cert_verify)) 2552 goto err; 2553 2554 ret = 1; 2555 err: 2556 EVP_MD_CTX_cleanup(&mctx); 2557 free(signature); 2558 return ret; 2559 } 2560 #endif 2561 2562 int 2563 ssl3_send_client_verify(SSL *s) 2564 { 2565 CBB cbb, cert_verify; 2566 EVP_PKEY *pkey; 2567 2568 memset(&cbb, 0, sizeof(cbb)); 2569 2570 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2571 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2572 SSL3_MT_CERTIFICATE_VERIFY)) 2573 goto err; 2574 2575 pkey = s->cert->key->privatekey; 2576 2577 /* 2578 * For TLS v1.2 send signature algorithm and signature 2579 * using agreed digest and cached handshake records. 2580 */ 2581 if (SSL_USE_SIGALGS(s)) { 2582 if (!ssl3_send_client_verify_sigalgs(s, &cert_verify)) 2583 goto err; 2584 } else if (pkey->type == EVP_PKEY_RSA) { 2585 if (!ssl3_send_client_verify_rsa(s, &cert_verify)) 2586 goto err; 2587 } else if (pkey->type == EVP_PKEY_EC) { 2588 if (!ssl3_send_client_verify_ec(s, &cert_verify)) 2589 goto err; 2590 #ifndef OPENSSL_NO_GOST 2591 } else if (pkey->type == NID_id_GostR3410_94 || 2592 pkey->type == NID_id_GostR3410_2001) { 2593 if (!ssl3_send_client_verify_gost(s, &cert_verify)) 2594 goto err; 2595 #endif 2596 } else { 2597 SSLerror(s, ERR_R_INTERNAL_ERROR); 2598 goto err; 2599 } 2600 2601 tls1_transcript_free(s); 2602 2603 if (!ssl3_handshake_msg_finish(s, &cbb)) 2604 goto err; 2605 2606 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2607 } 2608 2609 return (ssl3_handshake_write(s)); 2610 2611 err: 2612 CBB_cleanup(&cbb); 2613 2614 return (-1); 2615 } 2616 2617 int 2618 ssl3_send_client_certificate(SSL *s) 2619 { 2620 EVP_PKEY *pkey = NULL; 2621 X509 *x509 = NULL; 2622 CBB cbb, client_cert; 2623 int i; 2624 2625 memset(&cbb, 0, sizeof(cbb)); 2626 2627 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2628 if (s->cert->key->x509 == NULL || 2629 s->cert->key->privatekey == NULL) 2630 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2631 else 2632 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2633 } 2634 2635 /* We need to get a client cert */ 2636 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2637 /* 2638 * If we get an error, we need to 2639 * ssl->internal->rwstate = SSL_X509_LOOKUP; return(-1); 2640 * We then get retried later. 2641 */ 2642 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2643 if (i < 0) { 2644 s->internal->rwstate = SSL_X509_LOOKUP; 2645 return (-1); 2646 } 2647 s->internal->rwstate = SSL_NOTHING; 2648 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2649 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2650 if (!SSL_use_certificate(s, x509) || 2651 !SSL_use_PrivateKey(s, pkey)) 2652 i = 0; 2653 } else if (i == 1) { 2654 i = 0; 2655 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2656 } 2657 2658 X509_free(x509); 2659 EVP_PKEY_free(pkey); 2660 if (i == 0) { 2661 S3I(s)->hs.tls12.cert_request = 2; 2662 2663 /* There is no client certificate to verify. */ 2664 tls1_transcript_free(s); 2665 } 2666 2667 /* Ok, we have a cert */ 2668 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2669 } 2670 2671 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2672 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2673 SSL3_MT_CERTIFICATE)) 2674 goto err; 2675 if (!ssl3_output_cert_chain(s, &client_cert, 2676 (S3I(s)->hs.tls12.cert_request == 2) ? NULL : s->cert->key)) 2677 goto err; 2678 if (!ssl3_handshake_msg_finish(s, &cbb)) 2679 goto err; 2680 2681 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2682 } 2683 2684 /* SSL3_ST_CW_CERT_D */ 2685 return (ssl3_handshake_write(s)); 2686 2687 err: 2688 CBB_cleanup(&cbb); 2689 2690 return (0); 2691 } 2692 2693 #define has_bits(i,m) (((i)&(m)) == (m)) 2694 2695 int 2696 ssl3_check_cert_and_algorithm(SSL *s) 2697 { 2698 int i, idx; 2699 long alg_k, alg_a; 2700 EVP_PKEY *pkey = NULL; 2701 SESS_CERT *sc; 2702 DH *dh; 2703 2704 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2705 alg_a = S3I(s)->hs.cipher->algorithm_auth; 2706 2707 /* We don't have a certificate. */ 2708 if (alg_a & SSL_aNULL) 2709 return (1); 2710 2711 sc = SSI(s)->sess_cert; 2712 if (sc == NULL) { 2713 SSLerror(s, ERR_R_INTERNAL_ERROR); 2714 goto err; 2715 } 2716 dh = SSI(s)->sess_cert->peer_dh_tmp; 2717 2718 /* This is the passed certificate. */ 2719 2720 idx = sc->peer_cert_type; 2721 if (idx == SSL_PKEY_ECC) { 2722 if (ssl_check_srvr_ecc_cert_and_alg( 2723 sc->peer_pkeys[idx].x509, s) == 0) { 2724 /* check failed */ 2725 SSLerror(s, SSL_R_BAD_ECC_CERT); 2726 goto fatal_err; 2727 } else { 2728 return (1); 2729 } 2730 } 2731 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2732 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2733 EVP_PKEY_free(pkey); 2734 2735 /* Check that we have a certificate if we require one. */ 2736 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2737 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2738 goto fatal_err; 2739 } 2740 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2741 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2742 goto fatal_err; 2743 } 2744 if ((alg_k & SSL_kDHE) && 2745 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2746 SSLerror(s, SSL_R_MISSING_DH_KEY); 2747 goto fatal_err; 2748 } 2749 2750 return (1); 2751 fatal_err: 2752 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2753 err: 2754 return (0); 2755 } 2756 2757 /* 2758 * Check to see if handshake is full or resumed. Usually this is just a 2759 * case of checking to see if a cache hit has occurred. In the case of 2760 * session tickets we have to check the next message to be sure. 2761 */ 2762 2763 int 2764 ssl3_check_finished(SSL *s) 2765 { 2766 int ok; 2767 long n; 2768 2769 /* If we have no ticket it cannot be a resumed session. */ 2770 if (!s->session->tlsext_tick) 2771 return (1); 2772 /* this function is called when we really expect a Certificate 2773 * message, so permit appropriate message length */ 2774 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2775 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2776 if (!ok) 2777 return ((int)n); 2778 2779 S3I(s)->hs.tls12.reuse_message = 1; 2780 if ((S3I(s)->hs.tls12.message_type == SSL3_MT_FINISHED) || 2781 (S3I(s)->hs.tls12.message_type == SSL3_MT_NEWSESSION_TICKET)) 2782 return (2); 2783 2784 return (1); 2785 } 2786 2787 int 2788 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2789 { 2790 int i = 0; 2791 2792 #ifndef OPENSSL_NO_ENGINE 2793 if (s->ctx->internal->client_cert_engine) { 2794 i = ENGINE_load_ssl_client_cert( 2795 s->ctx->internal->client_cert_engine, s, 2796 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2797 if (i != 0) 2798 return (i); 2799 } 2800 #endif 2801 if (s->ctx->internal->client_cert_cb) 2802 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2803 return (i); 2804 } 2805