1 /* $OpenBSD: ssl_clnt.c,v 1.78 2021/02/07 15:26:32 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 "ssl_locl.h" 156 157 #include <openssl/bn.h> 158 #include <openssl/buffer.h> 159 #include <openssl/curve25519.h> 160 #include <openssl/dh.h> 161 #include <openssl/evp.h> 162 #include <openssl/md5.h> 163 #include <openssl/objects.h> 164 165 #ifndef OPENSSL_NO_ENGINE 166 #include <openssl/engine.h> 167 #endif 168 #ifndef OPENSSL_NO_GOST 169 #include <openssl/gost.h> 170 #endif 171 172 #include "bytestring.h" 173 #include "ssl_sigalgs.h" 174 #include "ssl_tlsext.h" 175 176 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b); 177 178 int 179 ssl3_connect(SSL *s) 180 { 181 void (*cb)(const SSL *ssl, int type, int val) = NULL; 182 int ret = -1; 183 int new_state, state, skip = 0; 184 185 ERR_clear_error(); 186 errno = 0; 187 188 if (s->internal->info_callback != NULL) 189 cb = s->internal->info_callback; 190 else if (s->ctx->internal->info_callback != NULL) 191 cb = s->ctx->internal->info_callback; 192 193 s->internal->in_handshake++; 194 if (!SSL_in_init(s) || SSL_in_before(s)) 195 SSL_clear(s); 196 197 for (;;) { 198 state = S3I(s)->hs.state; 199 200 switch (S3I(s)->hs.state) { 201 case SSL_ST_RENEGOTIATE: 202 s->internal->renegotiate = 1; 203 S3I(s)->hs.state = SSL_ST_CONNECT; 204 s->ctx->internal->stats.sess_connect_renegotiate++; 205 /* break */ 206 case SSL_ST_BEFORE: 207 case SSL_ST_CONNECT: 208 case SSL_ST_BEFORE|SSL_ST_CONNECT: 209 case SSL_ST_OK|SSL_ST_CONNECT: 210 211 s->server = 0; 212 if (cb != NULL) 213 cb(s, SSL_CB_HANDSHAKE_START, 1); 214 215 if (!ssl_legacy_stack_version(s, s->version)) { 216 SSLerror(s, ERR_R_INTERNAL_ERROR); 217 ret = -1; 218 goto end; 219 } 220 221 /* s->version=SSL3_VERSION; */ 222 s->internal->type = SSL_ST_CONNECT; 223 224 if (!ssl3_setup_init_buffer(s)) { 225 ret = -1; 226 goto end; 227 } 228 if (!ssl3_setup_buffers(s)) { 229 ret = -1; 230 goto end; 231 } 232 if (!ssl_init_wbio_buffer(s, 0)) { 233 ret = -1; 234 goto end; 235 } 236 237 /* don't push the buffering BIO quite yet */ 238 239 if (!tls1_transcript_init(s)) { 240 ret = -1; 241 goto end; 242 } 243 244 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 245 s->ctx->internal->stats.sess_connect++; 246 s->internal->init_num = 0; 247 248 if (SSL_is_dtls(s)) { 249 /* mark client_random uninitialized */ 250 memset(s->s3->client_random, 0, 251 sizeof(s->s3->client_random)); 252 D1I(s)->send_cookie = 0; 253 s->internal->hit = 0; 254 } 255 break; 256 257 case SSL3_ST_CW_CLNT_HELLO_A: 258 case SSL3_ST_CW_CLNT_HELLO_B: 259 s->internal->shutdown = 0; 260 261 if (SSL_is_dtls(s)) { 262 /* every DTLS ClientHello resets Finished MAC */ 263 tls1_transcript_reset(s); 264 265 dtls1_start_timer(s); 266 } 267 268 ret = ssl3_send_client_hello(s); 269 if (ret <= 0) 270 goto end; 271 272 if (SSL_is_dtls(s) && D1I(s)->send_cookie) { 273 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 274 S3I(s)->hs.next_state = SSL3_ST_CR_SRVR_HELLO_A; 275 } else 276 S3I(s)->hs.state = SSL3_ST_CR_SRVR_HELLO_A; 277 278 s->internal->init_num = 0; 279 280 /* turn on buffering for the next lot of output */ 281 if (s->bbio != s->wbio) 282 s->wbio = BIO_push(s->bbio, s->wbio); 283 284 break; 285 286 case SSL3_ST_CR_SRVR_HELLO_A: 287 case SSL3_ST_CR_SRVR_HELLO_B: 288 ret = ssl3_get_server_hello(s); 289 if (ret <= 0) 290 goto end; 291 292 if (s->internal->hit) { 293 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 294 if (!SSL_is_dtls(s)) { 295 if (s->internal->tlsext_ticket_expected) { 296 /* receive renewed session ticket */ 297 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 298 } 299 300 /* No client certificate verification. */ 301 tls1_transcript_free(s); 302 } 303 } else if (SSL_is_dtls(s)) { 304 S3I(s)->hs.state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 305 } else { 306 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 307 } 308 s->internal->init_num = 0; 309 break; 310 311 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 312 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 313 ret = ssl3_get_dtls_hello_verify(s); 314 if (ret <= 0) 315 goto end; 316 dtls1_stop_timer(s); 317 if (D1I(s)->send_cookie) /* start again, with a cookie */ 318 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 319 else 320 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 321 s->internal->init_num = 0; 322 break; 323 324 case SSL3_ST_CR_CERT_A: 325 case SSL3_ST_CR_CERT_B: 326 ret = ssl3_check_finished(s); 327 if (ret <= 0) 328 goto end; 329 if (ret == 2) { 330 s->internal->hit = 1; 331 if (s->internal->tlsext_ticket_expected) 332 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 333 else 334 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 335 s->internal->init_num = 0; 336 break; 337 } 338 /* Check if it is anon DH/ECDH. */ 339 if (!(S3I(s)->hs.new_cipher->algorithm_auth & 340 SSL_aNULL)) { 341 ret = ssl3_get_server_certificate(s); 342 if (ret <= 0) 343 goto end; 344 if (s->internal->tlsext_status_expected) 345 S3I(s)->hs.state = SSL3_ST_CR_CERT_STATUS_A; 346 else 347 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 348 } else { 349 skip = 1; 350 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 351 } 352 s->internal->init_num = 0; 353 break; 354 355 case SSL3_ST_CR_KEY_EXCH_A: 356 case SSL3_ST_CR_KEY_EXCH_B: 357 ret = ssl3_get_server_key_exchange(s); 358 if (ret <= 0) 359 goto end; 360 S3I(s)->hs.state = SSL3_ST_CR_CERT_REQ_A; 361 s->internal->init_num = 0; 362 363 /* 364 * At this point we check that we have the 365 * required stuff from the server. 366 */ 367 if (!ssl3_check_cert_and_algorithm(s)) { 368 ret = -1; 369 goto end; 370 } 371 break; 372 373 case SSL3_ST_CR_CERT_REQ_A: 374 case SSL3_ST_CR_CERT_REQ_B: 375 ret = ssl3_get_certificate_request(s); 376 if (ret <= 0) 377 goto end; 378 S3I(s)->hs.state = SSL3_ST_CR_SRVR_DONE_A; 379 s->internal->init_num = 0; 380 break; 381 382 case SSL3_ST_CR_SRVR_DONE_A: 383 case SSL3_ST_CR_SRVR_DONE_B: 384 ret = ssl3_get_server_done(s); 385 if (ret <= 0) 386 goto end; 387 if (SSL_is_dtls(s)) 388 dtls1_stop_timer(s); 389 if (S3I(s)->tmp.cert_req) 390 S3I(s)->hs.state = SSL3_ST_CW_CERT_A; 391 else 392 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 393 s->internal->init_num = 0; 394 395 break; 396 397 case SSL3_ST_CW_CERT_A: 398 case SSL3_ST_CW_CERT_B: 399 case SSL3_ST_CW_CERT_C: 400 case SSL3_ST_CW_CERT_D: 401 if (SSL_is_dtls(s)) 402 dtls1_start_timer(s); 403 ret = ssl3_send_client_certificate(s); 404 if (ret <= 0) 405 goto end; 406 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 407 s->internal->init_num = 0; 408 break; 409 410 case SSL3_ST_CW_KEY_EXCH_A: 411 case SSL3_ST_CW_KEY_EXCH_B: 412 if (SSL_is_dtls(s)) 413 dtls1_start_timer(s); 414 ret = ssl3_send_client_key_exchange(s); 415 if (ret <= 0) 416 goto end; 417 /* 418 * EAY EAY EAY need to check for DH fix cert 419 * sent back 420 */ 421 /* 422 * For TLS, cert_req is set to 2, so a cert chain 423 * of nothing is sent, but no verify packet is sent 424 */ 425 /* 426 * XXX: For now, we do not support client 427 * authentication in ECDH cipher suites with 428 * ECDH (rather than ECDSA) certificates. 429 * We need to skip the certificate verify 430 * message when client's ECDH public key is sent 431 * inside the client certificate. 432 */ 433 if (S3I(s)->tmp.cert_req == 1) { 434 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_A; 435 } else { 436 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 437 S3I(s)->change_cipher_spec = 0; 438 } 439 if (!SSL_is_dtls(s)) { 440 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 441 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 442 S3I(s)->change_cipher_spec = 0; 443 } 444 } 445 446 s->internal->init_num = 0; 447 break; 448 449 case SSL3_ST_CW_CERT_VRFY_A: 450 case SSL3_ST_CW_CERT_VRFY_B: 451 if (SSL_is_dtls(s)) 452 dtls1_start_timer(s); 453 ret = ssl3_send_client_verify(s); 454 if (ret <= 0) 455 goto end; 456 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 457 s->internal->init_num = 0; 458 S3I(s)->change_cipher_spec = 0; 459 break; 460 461 case SSL3_ST_CW_CHANGE_A: 462 case SSL3_ST_CW_CHANGE_B: 463 if (SSL_is_dtls(s) && !s->internal->hit) 464 dtls1_start_timer(s); 465 ret = ssl3_send_change_cipher_spec(s, 466 SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B); 467 if (ret <= 0) 468 goto end; 469 470 S3I(s)->hs.state = SSL3_ST_CW_FINISHED_A; 471 s->internal->init_num = 0; 472 473 s->session->cipher = S3I(s)->hs.new_cipher; 474 if (!tls1_setup_key_block(s)) { 475 ret = -1; 476 goto end; 477 } 478 479 if (!tls1_change_cipher_state(s, 480 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) { 481 ret = -1; 482 goto end; 483 } 484 485 if (SSL_is_dtls(s)) 486 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 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, TLS_MD_CLIENT_FINISH_CONST, 496 TLS_MD_CLIENT_FINISH_CONST_SIZE); 497 if (ret <= 0) 498 goto end; 499 if (!SSL_is_dtls(s)) 500 s->s3->flags |= SSL3_FLAGS_CCS_OK; 501 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 502 503 /* clear flags */ 504 if (s->internal->hit) { 505 S3I(s)->hs.next_state = SSL_ST_OK; 506 } else { 507 /* Allow NewSessionTicket if ticket expected */ 508 if (s->internal->tlsext_ticket_expected) 509 S3I(s)->hs.next_state = 510 SSL3_ST_CR_SESSION_TICKET_A; 511 else 512 S3I(s)->hs.next_state = 513 SSL3_ST_CR_FINISHED_A; 514 } 515 s->internal->init_num = 0; 516 break; 517 518 case SSL3_ST_CR_SESSION_TICKET_A: 519 case SSL3_ST_CR_SESSION_TICKET_B: 520 ret = ssl3_get_new_session_ticket(s); 521 if (ret <= 0) 522 goto end; 523 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 524 s->internal->init_num = 0; 525 break; 526 527 case SSL3_ST_CR_CERT_STATUS_A: 528 case SSL3_ST_CR_CERT_STATUS_B: 529 ret = ssl3_get_cert_status(s); 530 if (ret <= 0) 531 goto end; 532 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 533 s->internal->init_num = 0; 534 break; 535 536 case SSL3_ST_CR_FINISHED_A: 537 case SSL3_ST_CR_FINISHED_B: 538 if (SSL_is_dtls(s)) 539 D1I(s)->change_cipher_spec_ok = 1; 540 else 541 s->s3->flags |= SSL3_FLAGS_CCS_OK; 542 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 543 SSL3_ST_CR_FINISHED_B); 544 if (ret <= 0) 545 goto end; 546 if (SSL_is_dtls(s)) 547 dtls1_stop_timer(s); 548 549 if (s->internal->hit) 550 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 551 else 552 S3I(s)->hs.state = SSL_ST_OK; 553 s->internal->init_num = 0; 554 break; 555 556 case SSL3_ST_CW_FLUSH: 557 s->internal->rwstate = SSL_WRITING; 558 if (BIO_flush(s->wbio) <= 0) { 559 if (SSL_is_dtls(s)) { 560 /* If the write error was fatal, stop trying */ 561 if (!BIO_should_retry(s->wbio)) { 562 s->internal->rwstate = SSL_NOTHING; 563 S3I(s)->hs.state = S3I(s)->hs.next_state; 564 } 565 } 566 ret = -1; 567 goto end; 568 } 569 s->internal->rwstate = SSL_NOTHING; 570 S3I(s)->hs.state = S3I(s)->hs.next_state; 571 break; 572 573 case SSL_ST_OK: 574 /* clean a few things up */ 575 tls1_cleanup_key_block(s); 576 577 if (S3I(s)->handshake_transcript != NULL) { 578 SSLerror(s, ERR_R_INTERNAL_ERROR); 579 ret = -1; 580 goto end; 581 } 582 583 if (!SSL_is_dtls(s)) 584 ssl3_release_init_buffer(s); 585 586 ssl_free_wbio_buffer(s); 587 588 s->internal->init_num = 0; 589 s->internal->renegotiate = 0; 590 s->internal->new_session = 0; 591 592 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 593 if (s->internal->hit) 594 s->ctx->internal->stats.sess_hit++; 595 596 ret = 1; 597 /* s->server=0; */ 598 s->internal->handshake_func = ssl3_connect; 599 s->ctx->internal->stats.sess_connect_good++; 600 601 if (cb != NULL) 602 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 603 604 if (SSL_is_dtls(s)) { 605 /* done with handshaking */ 606 D1I(s)->handshake_read_seq = 0; 607 D1I(s)->next_handshake_write_seq = 0; 608 } 609 610 goto end; 611 /* break; */ 612 613 default: 614 SSLerror(s, SSL_R_UNKNOWN_STATE); 615 ret = -1; 616 goto end; 617 /* break; */ 618 } 619 620 /* did we do anything */ 621 if (!S3I(s)->tmp.reuse_message && !skip) { 622 if (s->internal->debug) { 623 if ((ret = BIO_flush(s->wbio)) <= 0) 624 goto end; 625 } 626 627 if ((cb != NULL) && (S3I(s)->hs.state != state)) { 628 new_state = S3I(s)->hs.state; 629 S3I(s)->hs.state = state; 630 cb(s, SSL_CB_CONNECT_LOOP, 1); 631 S3I(s)->hs.state = new_state; 632 } 633 } 634 skip = 0; 635 } 636 637 end: 638 s->internal->in_handshake--; 639 if (cb != NULL) 640 cb(s, SSL_CB_CONNECT_EXIT, ret); 641 642 return (ret); 643 } 644 645 int 646 ssl3_send_client_hello(SSL *s) 647 { 648 CBB cbb, client_hello, session_id, cookie, cipher_suites; 649 CBB compression_methods; 650 uint16_t max_version; 651 size_t sl; 652 653 memset(&cbb, 0, sizeof(cbb)); 654 655 if (S3I(s)->hs.state == SSL3_ST_CW_CLNT_HELLO_A) { 656 SSL_SESSION *sess = s->session; 657 658 if (ssl_supported_version_range(s, NULL, &max_version) != 1) { 659 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 660 return (-1); 661 } 662 s->client_version = s->version = max_version; 663 664 if (sess == NULL || 665 sess->ssl_version != s->version || 666 (!sess->session_id_length && !sess->tlsext_tick) || 667 sess->internal->not_resumable) { 668 if (!ssl_get_new_session(s, 0)) 669 goto err; 670 } 671 /* else use the pre-loaded session */ 672 673 /* 674 * If a DTLS ClientHello message is being resent after a 675 * HelloVerifyRequest, we must retain the original client 676 * random value. 677 */ 678 if (!SSL_is_dtls(s) || D1I(s)->send_cookie == 0) 679 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE); 680 681 if (!ssl3_handshake_msg_start(s, &cbb, &client_hello, 682 SSL3_MT_CLIENT_HELLO)) 683 goto err; 684 685 /* 686 * Version indicates the negotiated version: for example from 687 * an SSLv2/v3 compatible client hello). The client_version 688 * field is the maximum version we permit and it is also 689 * used in RSA encrypted premaster secrets. Some servers can 690 * choke if we initially report a higher version then 691 * renegotiate to a lower one in the premaster secret. This 692 * didn't happen with TLS 1.0 as most servers supported it 693 * but it can with TLS 1.1 or later if the server only supports 694 * 1.0. 695 * 696 * Possible scenario with previous logic: 697 * 1. Client hello indicates TLS 1.2 698 * 2. Server hello says TLS 1.0 699 * 3. RSA encrypted premaster secret uses 1.2. 700 * 4. Handhaked proceeds using TLS 1.0. 701 * 5. Server sends hello request to renegotiate. 702 * 6. Client hello indicates TLS v1.0 as we now 703 * know that is maximum server supports. 704 * 7. Server chokes on RSA encrypted premaster secret 705 * containing version 1.0. 706 * 707 * For interoperability it should be OK to always use the 708 * maximum version we support in client hello and then rely 709 * on the checking of version to ensure the servers isn't 710 * being inconsistent: for example initially negotiating with 711 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using 712 * client_version in client hello and not resetting it to 713 * the negotiated version. 714 */ 715 if (!CBB_add_u16(&client_hello, s->client_version)) 716 goto err; 717 718 /* Random stuff */ 719 if (!CBB_add_bytes(&client_hello, s->s3->client_random, 720 sizeof(s->s3->client_random))) 721 goto err; 722 723 /* Session ID */ 724 if (!CBB_add_u8_length_prefixed(&client_hello, &session_id)) 725 goto err; 726 if (!s->internal->new_session && 727 s->session->session_id_length > 0) { 728 sl = s->session->session_id_length; 729 if (sl > sizeof(s->session->session_id)) { 730 SSLerror(s, ERR_R_INTERNAL_ERROR); 731 goto err; 732 } 733 if (!CBB_add_bytes(&session_id, 734 s->session->session_id, sl)) 735 goto err; 736 } 737 738 /* DTLS Cookie. */ 739 if (SSL_is_dtls(s)) { 740 if (D1I(s)->cookie_len > sizeof(D1I(s)->cookie)) { 741 SSLerror(s, ERR_R_INTERNAL_ERROR); 742 goto err; 743 } 744 if (!CBB_add_u8_length_prefixed(&client_hello, &cookie)) 745 goto err; 746 if (!CBB_add_bytes(&cookie, D1I(s)->cookie, 747 D1I(s)->cookie_len)) 748 goto err; 749 } 750 751 /* Ciphers supported */ 752 if (!CBB_add_u16_length_prefixed(&client_hello, &cipher_suites)) 753 return 0; 754 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), 755 &cipher_suites)) { 756 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE); 757 goto err; 758 } 759 760 /* Add in compression methods (null) */ 761 if (!CBB_add_u8_length_prefixed(&client_hello, 762 &compression_methods)) 763 goto err; 764 if (!CBB_add_u8(&compression_methods, 0)) 765 goto err; 766 767 /* TLS extensions */ 768 if (!tlsext_client_build(s, SSL_TLSEXT_MSG_CH, &client_hello)) { 769 SSLerror(s, ERR_R_INTERNAL_ERROR); 770 goto err; 771 } 772 773 if (!ssl3_handshake_msg_finish(s, &cbb)) 774 goto err; 775 776 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_B; 777 } 778 779 /* SSL3_ST_CW_CLNT_HELLO_B */ 780 return (ssl3_handshake_write(s)); 781 782 err: 783 CBB_cleanup(&cbb); 784 785 return (-1); 786 } 787 788 int 789 ssl3_get_dtls_hello_verify(SSL *s) 790 { 791 long n; 792 int al, ok = 0; 793 size_t cookie_len; 794 uint16_t ssl_version; 795 CBS hello_verify_request, cookie; 796 797 n = ssl3_get_message(s, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 798 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, s->internal->max_cert_list, &ok); 799 if (!ok) 800 return ((int)n); 801 802 if (S3I(s)->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 803 D1I(s)->send_cookie = 0; 804 S3I(s)->tmp.reuse_message = 1; 805 return (1); 806 } 807 808 if (n < 0) 809 goto truncated; 810 811 CBS_init(&hello_verify_request, s->internal->init_msg, n); 812 813 if (!CBS_get_u16(&hello_verify_request, &ssl_version)) 814 goto truncated; 815 816 if (ssl_version != s->version) { 817 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 818 s->version = (s->version & 0xff00) | (ssl_version & 0xff); 819 al = SSL_AD_PROTOCOL_VERSION; 820 goto f_err; 821 } 822 823 if (!CBS_get_u8_length_prefixed(&hello_verify_request, &cookie)) 824 goto truncated; 825 826 if (!CBS_write_bytes(&cookie, D1I(s)->cookie, 827 sizeof(D1I(s)->cookie), &cookie_len)) { 828 D1I(s)->cookie_len = 0; 829 al = SSL_AD_ILLEGAL_PARAMETER; 830 goto f_err; 831 } 832 D1I(s)->cookie_len = cookie_len; 833 D1I(s)->send_cookie = 1; 834 835 return 1; 836 837 truncated: 838 al = SSL_AD_DECODE_ERROR; 839 f_err: 840 ssl3_send_alert(s, SSL3_AL_FATAL, al); 841 return -1; 842 } 843 844 int 845 ssl3_get_server_hello(SSL *s) 846 { 847 CBS cbs, server_random, session_id; 848 uint16_t server_version, cipher_suite; 849 uint16_t min_version, max_version; 850 uint8_t compression_method; 851 const SSL_CIPHER *cipher; 852 const SSL_METHOD *method; 853 unsigned long alg_k; 854 size_t outlen; 855 int al, ok; 856 long n; 857 858 s->internal->first_packet = 1; 859 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 860 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, /* ?? */ &ok); 861 if (!ok) 862 return ((int)n); 863 s->internal->first_packet = 0; 864 865 if (n < 0) 866 goto truncated; 867 868 CBS_init(&cbs, s->internal->init_msg, n); 869 870 if (SSL_is_dtls(s)) { 871 if (S3I(s)->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 872 if (D1I(s)->send_cookie == 0) { 873 S3I(s)->tmp.reuse_message = 1; 874 return (1); 875 } else { 876 /* Already sent a cookie. */ 877 al = SSL_AD_UNEXPECTED_MESSAGE; 878 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 879 goto f_err; 880 } 881 } 882 } 883 884 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_HELLO) { 885 al = SSL_AD_UNEXPECTED_MESSAGE; 886 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 887 goto f_err; 888 } 889 890 if (!CBS_get_u16(&cbs, &server_version)) 891 goto truncated; 892 893 if (ssl_supported_version_range(s, &min_version, &max_version) != 1) { 894 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 895 goto err; 896 } 897 898 if (server_version < min_version || server_version > max_version) { 899 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 900 s->version = (s->version & 0xff00) | (server_version & 0xff); 901 al = SSL_AD_PROTOCOL_VERSION; 902 goto f_err; 903 } 904 s->version = server_version; 905 906 if ((method = ssl_get_method(server_version)) == NULL) { 907 SSLerror(s, ERR_R_INTERNAL_ERROR); 908 goto err; 909 } 910 s->method = method; 911 912 /* Server random. */ 913 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 914 goto truncated; 915 if (!CBS_write_bytes(&server_random, s->s3->server_random, 916 sizeof(s->s3->server_random), NULL)) 917 goto err; 918 919 if (!ssl_downgrade_max_version(s, &max_version)) 920 goto err; 921 if (!SSL_is_dtls(s) && max_version >= TLS1_2_VERSION && 922 s->version < max_version) { 923 /* 924 * RFC 8446 section 4.1.3. We must not downgrade if the server 925 * random value contains the TLS 1.2 or TLS 1.1 magical value. 926 */ 927 if (!CBS_skip(&server_random, 928 CBS_len(&server_random) - sizeof(tls13_downgrade_12))) 929 goto err; 930 if (s->version == TLS1_2_VERSION && 931 CBS_mem_equal(&server_random, tls13_downgrade_12, 932 sizeof(tls13_downgrade_12))) { 933 al = SSL_AD_ILLEGAL_PARAMETER; 934 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 935 goto f_err; 936 } 937 if (CBS_mem_equal(&server_random, tls13_downgrade_11, 938 sizeof(tls13_downgrade_11))) { 939 al = SSL_AD_ILLEGAL_PARAMETER; 940 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 941 goto f_err; 942 } 943 } 944 945 /* Session ID. */ 946 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 947 goto truncated; 948 949 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 950 al = SSL_AD_ILLEGAL_PARAMETER; 951 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 952 goto f_err; 953 } 954 955 /* Cipher suite. */ 956 if (!CBS_get_u16(&cbs, &cipher_suite)) 957 goto truncated; 958 959 /* 960 * Check if we want to resume the session based on external 961 * pre-shared secret. 962 */ 963 if (s->internal->tls_session_secret_cb) { 964 SSL_CIPHER *pref_cipher = NULL; 965 s->session->master_key_length = sizeof(s->session->master_key); 966 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 967 &s->session->master_key_length, NULL, &pref_cipher, 968 s->internal->tls_session_secret_cb_arg)) { 969 s->session->cipher = pref_cipher ? pref_cipher : 970 ssl3_get_cipher_by_value(cipher_suite); 971 s->s3->flags |= SSL3_FLAGS_CCS_OK; 972 } 973 } 974 975 if (s->session->session_id_length != 0 && 976 CBS_mem_equal(&session_id, s->session->session_id, 977 s->session->session_id_length)) { 978 if (s->sid_ctx_length != s->session->sid_ctx_length || 979 timingsafe_memcmp(s->session->sid_ctx, 980 s->sid_ctx, s->sid_ctx_length) != 0) { 981 /* actually a client application bug */ 982 al = SSL_AD_ILLEGAL_PARAMETER; 983 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 984 goto f_err; 985 } 986 s->s3->flags |= SSL3_FLAGS_CCS_OK; 987 s->internal->hit = 1; 988 } else { 989 /* a miss or crap from the other end */ 990 991 /* If we were trying for session-id reuse, make a new 992 * SSL_SESSION so we don't stuff up other people */ 993 s->internal->hit = 0; 994 if (s->session->session_id_length > 0) { 995 if (!ssl_get_new_session(s, 0)) { 996 al = SSL_AD_INTERNAL_ERROR; 997 goto f_err; 998 } 999 } 1000 1001 /* 1002 * XXX - improve the handling for the case where there is a 1003 * zero length session identifier. 1004 */ 1005 if (!CBS_write_bytes(&session_id, s->session->session_id, 1006 sizeof(s->session->session_id), &outlen)) 1007 goto err; 1008 s->session->session_id_length = outlen; 1009 1010 s->session->ssl_version = s->version; 1011 } 1012 1013 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 1014 al = SSL_AD_ILLEGAL_PARAMETER; 1015 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 1016 goto f_err; 1017 } 1018 1019 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 1020 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 1021 (TLS1_get_version(s) < TLS1_2_VERSION)) { 1022 al = SSL_AD_ILLEGAL_PARAMETER; 1023 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1024 goto f_err; 1025 } 1026 1027 if (!ssl_cipher_in_list(SSL_get_ciphers(s), cipher)) { 1028 /* we did not say we would use this cipher */ 1029 al = SSL_AD_ILLEGAL_PARAMETER; 1030 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1031 goto f_err; 1032 } 1033 1034 /* 1035 * Depending on the session caching (internal/external), the cipher 1036 * and/or cipher_id values may not be set. Make sure that 1037 * cipher_id is set and use it for comparison. 1038 */ 1039 if (s->session->cipher) 1040 s->session->cipher_id = s->session->cipher->id; 1041 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 1042 al = SSL_AD_ILLEGAL_PARAMETER; 1043 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1044 goto f_err; 1045 } 1046 S3I(s)->hs.new_cipher = cipher; 1047 1048 if (!tls1_transcript_hash_init(s)) 1049 goto err; 1050 1051 /* 1052 * Don't digest cached records if no sigalgs: we may need them for 1053 * client authentication. 1054 */ 1055 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1056 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST))) 1057 tls1_transcript_free(s); 1058 1059 if (!CBS_get_u8(&cbs, &compression_method)) 1060 goto truncated; 1061 1062 if (compression_method != 0) { 1063 al = SSL_AD_ILLEGAL_PARAMETER; 1064 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1065 goto f_err; 1066 } 1067 1068 if (!tlsext_client_parse(s, SSL_TLSEXT_MSG_SH, &cbs, &al)) { 1069 SSLerror(s, SSL_R_PARSE_TLSEXT); 1070 goto f_err; 1071 } 1072 1073 /* 1074 * Determine if we need to see RI. Strictly speaking if we want to 1075 * avoid an attack we should *always* see RI even on initial server 1076 * hello because the client doesn't see any renegotiation during an 1077 * attack. However this would mean we could not connect to any server 1078 * which doesn't support RI so for the immediate future tolerate RI 1079 * absence on initial connect only. 1080 */ 1081 if (!S3I(s)->renegotiate_seen && 1082 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1083 al = SSL_AD_HANDSHAKE_FAILURE; 1084 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1085 goto f_err; 1086 } 1087 1088 if (ssl_check_serverhello_tlsext(s) <= 0) { 1089 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1090 goto err; 1091 } 1092 1093 return (1); 1094 1095 truncated: 1096 /* wrong packet length */ 1097 al = SSL_AD_DECODE_ERROR; 1098 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1099 f_err: 1100 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1101 err: 1102 return (-1); 1103 } 1104 1105 int 1106 ssl3_get_server_certificate(SSL *s) 1107 { 1108 int al, i, ok, ret = -1; 1109 long n; 1110 CBS cbs, cert_list; 1111 X509 *x = NULL; 1112 const unsigned char *q; 1113 STACK_OF(X509) *sk = NULL; 1114 SESS_CERT *sc; 1115 EVP_PKEY *pkey = NULL; 1116 1117 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1118 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 1119 if (!ok) 1120 return ((int)n); 1121 1122 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1123 S3I(s)->tmp.reuse_message = 1; 1124 return (1); 1125 } 1126 1127 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 1128 al = SSL_AD_UNEXPECTED_MESSAGE; 1129 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1130 goto f_err; 1131 } 1132 1133 1134 if ((sk = sk_X509_new_null()) == NULL) { 1135 SSLerror(s, ERR_R_MALLOC_FAILURE); 1136 goto err; 1137 } 1138 1139 if (n < 0) 1140 goto truncated; 1141 1142 CBS_init(&cbs, s->internal->init_msg, n); 1143 if (CBS_len(&cbs) < 3) 1144 goto truncated; 1145 1146 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1147 CBS_len(&cbs) != 0) { 1148 al = SSL_AD_DECODE_ERROR; 1149 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1150 goto f_err; 1151 } 1152 1153 while (CBS_len(&cert_list) > 0) { 1154 CBS cert; 1155 1156 if (CBS_len(&cert_list) < 3) 1157 goto truncated; 1158 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1159 al = SSL_AD_DECODE_ERROR; 1160 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1161 goto f_err; 1162 } 1163 1164 q = CBS_data(&cert); 1165 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1166 if (x == NULL) { 1167 al = SSL_AD_BAD_CERTIFICATE; 1168 SSLerror(s, ERR_R_ASN1_LIB); 1169 goto f_err; 1170 } 1171 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1172 al = SSL_AD_DECODE_ERROR; 1173 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1174 goto f_err; 1175 } 1176 if (!sk_X509_push(sk, x)) { 1177 SSLerror(s, ERR_R_MALLOC_FAILURE); 1178 goto err; 1179 } 1180 x = NULL; 1181 } 1182 1183 i = ssl_verify_cert_chain(s, sk); 1184 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1185 al = ssl_verify_alarm_type(s->verify_result); 1186 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1187 goto f_err; 1188 1189 } 1190 ERR_clear_error(); /* but we keep s->verify_result */ 1191 1192 sc = ssl_sess_cert_new(); 1193 if (sc == NULL) 1194 goto err; 1195 ssl_sess_cert_free(SSI(s)->sess_cert); 1196 SSI(s)->sess_cert = sc; 1197 1198 sc->cert_chain = sk; 1199 /* 1200 * Inconsistency alert: cert_chain does include the peer's 1201 * certificate, which we don't include in s3_srvr.c 1202 */ 1203 x = sk_X509_value(sk, 0); 1204 sk = NULL; 1205 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1206 1207 pkey = X509_get_pubkey(x); 1208 1209 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1210 x = NULL; 1211 al = SSL3_AL_FATAL; 1212 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1213 goto f_err; 1214 } 1215 1216 i = ssl_cert_type(x, pkey); 1217 if (i < 0) { 1218 x = NULL; 1219 al = SSL3_AL_FATAL; 1220 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1221 goto f_err; 1222 } 1223 1224 sc->peer_cert_type = i; 1225 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1226 /* 1227 * Why would the following ever happen? 1228 * We just created sc a couple of lines ago. 1229 */ 1230 X509_free(sc->peer_pkeys[i].x509); 1231 sc->peer_pkeys[i].x509 = x; 1232 sc->peer_key = &(sc->peer_pkeys[i]); 1233 1234 X509_free(s->session->peer); 1235 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1236 s->session->peer = x; 1237 s->session->verify_result = s->verify_result; 1238 1239 x = NULL; 1240 ret = 1; 1241 1242 if (0) { 1243 truncated: 1244 /* wrong packet length */ 1245 al = SSL_AD_DECODE_ERROR; 1246 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1247 f_err: 1248 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1249 } 1250 err: 1251 EVP_PKEY_free(pkey); 1252 X509_free(x); 1253 sk_X509_pop_free(sk, X509_free); 1254 1255 return (ret); 1256 } 1257 1258 static int 1259 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1260 { 1261 CBS dhp, dhg, dhpk; 1262 BN_CTX *bn_ctx = NULL; 1263 SESS_CERT *sc = NULL; 1264 DH *dh = NULL; 1265 long alg_a; 1266 int al; 1267 1268 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1269 sc = SSI(s)->sess_cert; 1270 1271 if ((dh = DH_new()) == NULL) { 1272 SSLerror(s, ERR_R_DH_LIB); 1273 goto err; 1274 } 1275 1276 if (!CBS_get_u16_length_prefixed(cbs, &dhp)) 1277 goto truncated; 1278 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1279 SSLerror(s, ERR_R_BN_LIB); 1280 goto err; 1281 } 1282 1283 if (!CBS_get_u16_length_prefixed(cbs, &dhg)) 1284 goto truncated; 1285 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1286 SSLerror(s, ERR_R_BN_LIB); 1287 goto err; 1288 } 1289 1290 if (!CBS_get_u16_length_prefixed(cbs, &dhpk)) 1291 goto truncated; 1292 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1293 NULL)) == NULL) { 1294 SSLerror(s, ERR_R_BN_LIB); 1295 goto err; 1296 } 1297 1298 /* 1299 * Check the strength of the DH key just constructed. 1300 * Discard keys weaker than 1024 bits. 1301 */ 1302 if (DH_size(dh) < 1024 / 8) { 1303 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1304 goto err; 1305 } 1306 1307 if (alg_a & SSL_aRSA) 1308 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1309 else 1310 /* XXX - Anonymous DH, so no certificate or pkey. */ 1311 *pkey = NULL; 1312 1313 sc->peer_dh_tmp = dh; 1314 1315 return (1); 1316 1317 truncated: 1318 al = SSL_AD_DECODE_ERROR; 1319 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1320 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1321 1322 err: 1323 DH_free(dh); 1324 BN_CTX_free(bn_ctx); 1325 1326 return (-1); 1327 } 1328 1329 static int 1330 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1331 { 1332 EC_KEY *ecdh = NULL; 1333 int ret = -1; 1334 1335 /* Extract the server's ephemeral ECDH public key. */ 1336 if ((ecdh = EC_KEY_new()) == NULL) { 1337 SSLerror(s, ERR_R_MALLOC_FAILURE); 1338 goto err; 1339 } 1340 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh, nid, public)) { 1341 SSLerror(s, SSL_R_BAD_ECPOINT); 1342 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1343 goto err; 1344 } 1345 1346 sc->peer_nid = nid; 1347 sc->peer_ecdh_tmp = ecdh; 1348 ecdh = NULL; 1349 1350 ret = 1; 1351 1352 err: 1353 EC_KEY_free(ecdh); 1354 1355 return (ret); 1356 } 1357 1358 static int 1359 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1360 { 1361 size_t outlen; 1362 1363 if (nid != NID_X25519) { 1364 SSLerror(s, ERR_R_INTERNAL_ERROR); 1365 goto err; 1366 } 1367 1368 if (CBS_len(public) != X25519_KEY_LENGTH) { 1369 SSLerror(s, SSL_R_BAD_ECPOINT); 1370 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1371 goto err; 1372 } 1373 1374 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1375 SSLerror(s, ERR_R_MALLOC_FAILURE); 1376 goto err; 1377 } 1378 1379 return (1); 1380 1381 err: 1382 return (-1); 1383 } 1384 1385 static int 1386 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1387 { 1388 CBS public; 1389 uint8_t curve_type; 1390 uint16_t curve_id; 1391 SESS_CERT *sc; 1392 long alg_a; 1393 int nid; 1394 int al; 1395 1396 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1397 sc = SSI(s)->sess_cert; 1398 1399 /* Only named curves are supported. */ 1400 if (!CBS_get_u8(cbs, &curve_type) || 1401 curve_type != NAMED_CURVE_TYPE || 1402 !CBS_get_u16(cbs, &curve_id)) { 1403 al = SSL_AD_DECODE_ERROR; 1404 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1405 goto f_err; 1406 } 1407 1408 /* 1409 * Check that the curve is one of our preferences - if it is not, 1410 * the server has sent us an invalid curve. 1411 */ 1412 if (tls1_check_curve(s, curve_id) != 1) { 1413 al = SSL_AD_DECODE_ERROR; 1414 SSLerror(s, SSL_R_WRONG_CURVE); 1415 goto f_err; 1416 } 1417 1418 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1419 al = SSL_AD_INTERNAL_ERROR; 1420 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1421 goto f_err; 1422 } 1423 1424 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1425 goto truncated; 1426 1427 if (nid == NID_X25519) { 1428 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1429 goto err; 1430 } else { 1431 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1432 goto err; 1433 } 1434 1435 /* 1436 * The ECC/TLS specification does not mention the use of DSA to sign 1437 * ECParameters in the server key exchange message. We do support RSA 1438 * and ECDSA. 1439 */ 1440 if (alg_a & SSL_aRSA) 1441 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1442 else if (alg_a & SSL_aECDSA) 1443 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1444 else 1445 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1446 *pkey = NULL; 1447 1448 return (1); 1449 1450 truncated: 1451 al = SSL_AD_DECODE_ERROR; 1452 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1453 1454 f_err: 1455 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1456 1457 err: 1458 return (-1); 1459 } 1460 1461 int 1462 ssl3_get_server_key_exchange(SSL *s) 1463 { 1464 CBS cbs, signature; 1465 const EVP_MD *md = NULL; 1466 EVP_PKEY *pkey = NULL; 1467 EVP_MD_CTX md_ctx; 1468 const unsigned char *param; 1469 long n, alg_k, alg_a; 1470 int al, ok; 1471 size_t param_len; 1472 1473 EVP_MD_CTX_init(&md_ctx); 1474 1475 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1476 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1477 1478 /* 1479 * Use same message size as in ssl3_get_certificate_request() 1480 * as ServerKeyExchange message may be skipped. 1481 */ 1482 n = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1483 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1484 if (!ok) 1485 return ((int)n); 1486 1487 if (n < 0) 1488 goto err; 1489 1490 CBS_init(&cbs, s->internal->init_msg, n); 1491 1492 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1493 /* 1494 * Do not skip server key exchange if this cipher suite uses 1495 * ephemeral keys. 1496 */ 1497 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1498 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1499 al = SSL_AD_UNEXPECTED_MESSAGE; 1500 goto f_err; 1501 } 1502 1503 S3I(s)->tmp.reuse_message = 1; 1504 EVP_MD_CTX_cleanup(&md_ctx); 1505 return (1); 1506 } 1507 1508 if (SSI(s)->sess_cert != NULL) { 1509 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1510 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1511 1512 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1513 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1514 1515 free(SSI(s)->sess_cert->peer_x25519_tmp); 1516 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1517 } else { 1518 SSI(s)->sess_cert = ssl_sess_cert_new(); 1519 if (SSI(s)->sess_cert == NULL) 1520 goto err; 1521 } 1522 1523 param = CBS_data(&cbs); 1524 param_len = CBS_len(&cbs); 1525 1526 if (alg_k & SSL_kDHE) { 1527 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1) 1528 goto err; 1529 } else if (alg_k & SSL_kECDHE) { 1530 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1) 1531 goto err; 1532 } else if (alg_k != 0) { 1533 al = SSL_AD_UNEXPECTED_MESSAGE; 1534 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1535 goto f_err; 1536 } 1537 1538 param_len -= CBS_len(&cbs); 1539 1540 /* if it was signed, check the signature */ 1541 if (pkey != NULL) { 1542 EVP_PKEY_CTX *pctx; 1543 const struct ssl_sigalg *sigalg; 1544 1545 if (SSL_USE_SIGALGS(s)) { 1546 uint16_t sigalg_value; 1547 1548 if (!CBS_get_u16(&cbs, &sigalg_value)) 1549 goto truncated; 1550 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, 1551 tls12_sigalgs_len)) == NULL) { 1552 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1553 al = SSL_AD_DECODE_ERROR; 1554 goto f_err; 1555 } 1556 if ((md = sigalg->md()) == NULL) { 1557 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1558 al = SSL_AD_DECODE_ERROR; 1559 goto f_err; 1560 } 1561 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) { 1562 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 1563 al = SSL_AD_DECODE_ERROR; 1564 goto f_err; 1565 } 1566 } else if (pkey->type == EVP_PKEY_RSA) { 1567 sigalg = ssl_sigalg_lookup(SIGALG_RSA_PKCS1_MD5_SHA1); 1568 } else if (pkey->type == EVP_PKEY_EC) { 1569 sigalg = ssl_sigalg_lookup(SIGALG_ECDSA_SHA1); 1570 } else { 1571 SSLerror(s, SSL_R_UNKNOWN_PKEY_TYPE); 1572 al = SSL_AD_DECODE_ERROR; 1573 goto f_err; 1574 } 1575 md = sigalg->md(); 1576 1577 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1578 goto truncated; 1579 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1580 al = SSL_AD_DECODE_ERROR; 1581 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1582 goto f_err; 1583 } 1584 1585 if (!EVP_DigestVerifyInit(&md_ctx, &pctx, md, NULL, pkey)) 1586 goto err; 1587 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->client_random, 1588 SSL3_RANDOM_SIZE)) 1589 goto err; 1590 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1591 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1592 RSA_PKCS1_PSS_PADDING) || 1593 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1594 goto err; 1595 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->server_random, 1596 SSL3_RANDOM_SIZE)) 1597 goto err; 1598 if (!EVP_DigestVerifyUpdate(&md_ctx, param, param_len)) 1599 goto err; 1600 if (EVP_DigestVerifyFinal(&md_ctx, CBS_data(&signature), 1601 CBS_len(&signature)) <= 0) { 1602 al = SSL_AD_DECRYPT_ERROR; 1603 SSLerror(s, SSL_R_BAD_SIGNATURE); 1604 goto f_err; 1605 } 1606 } else { 1607 /* aNULL does not need public keys. */ 1608 if (!(alg_a & SSL_aNULL)) { 1609 SSLerror(s, ERR_R_INTERNAL_ERROR); 1610 goto err; 1611 } 1612 } 1613 1614 if (CBS_len(&cbs) != 0) { 1615 al = SSL_AD_DECODE_ERROR; 1616 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1617 goto f_err; 1618 } 1619 1620 EVP_PKEY_free(pkey); 1621 EVP_MD_CTX_cleanup(&md_ctx); 1622 1623 return (1); 1624 1625 truncated: 1626 al = SSL_AD_DECODE_ERROR; 1627 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1628 1629 f_err: 1630 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1631 1632 err: 1633 EVP_PKEY_free(pkey); 1634 EVP_MD_CTX_cleanup(&md_ctx); 1635 1636 return (-1); 1637 } 1638 1639 int 1640 ssl3_get_certificate_request(SSL *s) 1641 { 1642 int ok, ret = 0; 1643 long n; 1644 uint8_t ctype_num; 1645 CBS cert_request, ctypes, rdn_list; 1646 X509_NAME *xn = NULL; 1647 const unsigned char *q; 1648 STACK_OF(X509_NAME) *ca_sk = NULL; 1649 1650 n = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1651 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1652 if (!ok) 1653 return ((int)n); 1654 1655 S3I(s)->tmp.cert_req = 0; 1656 1657 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_DONE) { 1658 S3I(s)->tmp.reuse_message = 1; 1659 /* 1660 * If we get here we don't need any cached handshake records 1661 * as we wont be doing client auth. 1662 */ 1663 tls1_transcript_free(s); 1664 return (1); 1665 } 1666 1667 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1668 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1669 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1670 goto err; 1671 } 1672 1673 /* TLS does not like anon-DH with client cert */ 1674 if (S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL) { 1675 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1676 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1677 goto err; 1678 } 1679 1680 if (n < 0) 1681 goto truncated; 1682 CBS_init(&cert_request, s->internal->init_msg, n); 1683 1684 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1685 SSLerror(s, ERR_R_MALLOC_FAILURE); 1686 goto err; 1687 } 1688 1689 /* get the certificate types */ 1690 if (!CBS_get_u8(&cert_request, &ctype_num)) 1691 goto truncated; 1692 1693 if (ctype_num > SSL3_CT_NUMBER) 1694 ctype_num = SSL3_CT_NUMBER; 1695 if (!CBS_get_bytes(&cert_request, &ctypes, ctype_num) || 1696 !CBS_write_bytes(&ctypes, (uint8_t *)S3I(s)->tmp.ctype, 1697 sizeof(S3I(s)->tmp.ctype), NULL)) { 1698 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1699 goto err; 1700 } 1701 1702 if (SSL_USE_SIGALGS(s)) { 1703 CBS sigalgs; 1704 1705 if (CBS_len(&cert_request) < 2) { 1706 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1707 goto err; 1708 } 1709 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1710 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1711 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1712 goto err; 1713 } 1714 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1715 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1716 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1717 goto err; 1718 } 1719 if (!CBS_stow(&sigalgs, &S3I(s)->hs.sigalgs, 1720 &S3I(s)->hs.sigalgs_len)) 1721 goto err; 1722 } 1723 1724 /* get the CA RDNs */ 1725 if (CBS_len(&cert_request) < 2) { 1726 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1727 goto err; 1728 } 1729 1730 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1731 CBS_len(&cert_request) != 0) { 1732 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1733 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1734 goto err; 1735 } 1736 1737 while (CBS_len(&rdn_list) > 0) { 1738 CBS rdn; 1739 1740 if (CBS_len(&rdn_list) < 2) { 1741 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1742 goto err; 1743 } 1744 1745 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1746 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1747 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1748 goto err; 1749 } 1750 1751 q = CBS_data(&rdn); 1752 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1753 ssl3_send_alert(s, SSL3_AL_FATAL, 1754 SSL_AD_DECODE_ERROR); 1755 SSLerror(s, ERR_R_ASN1_LIB); 1756 goto err; 1757 } 1758 1759 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1760 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1761 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1762 goto err; 1763 } 1764 if (!sk_X509_NAME_push(ca_sk, xn)) { 1765 SSLerror(s, ERR_R_MALLOC_FAILURE); 1766 goto err; 1767 } 1768 xn = NULL; /* avoid free in err block */ 1769 } 1770 1771 /* we should setup a certificate to return.... */ 1772 S3I(s)->tmp.cert_req = 1; 1773 S3I(s)->tmp.ctype_num = ctype_num; 1774 sk_X509_NAME_pop_free(S3I(s)->tmp.ca_names, X509_NAME_free); 1775 S3I(s)->tmp.ca_names = ca_sk; 1776 ca_sk = NULL; 1777 1778 ret = 1; 1779 if (0) { 1780 truncated: 1781 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1782 } 1783 err: 1784 X509_NAME_free(xn); 1785 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1786 return (ret); 1787 } 1788 1789 static int 1790 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1791 { 1792 return (X509_NAME_cmp(*a, *b)); 1793 } 1794 1795 int 1796 ssl3_get_new_session_ticket(SSL *s) 1797 { 1798 int ok, al, ret = 0; 1799 uint32_t lifetime_hint; 1800 long n; 1801 CBS cbs, session_ticket; 1802 1803 n = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1804 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1805 if (!ok) 1806 return ((int)n); 1807 1808 if (S3I(s)->tmp.message_type == SSL3_MT_FINISHED) { 1809 S3I(s)->tmp.reuse_message = 1; 1810 return (1); 1811 } 1812 if (S3I(s)->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) { 1813 al = SSL_AD_UNEXPECTED_MESSAGE; 1814 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1815 goto f_err; 1816 } 1817 1818 if (n < 0) { 1819 al = SSL_AD_DECODE_ERROR; 1820 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1821 goto f_err; 1822 } 1823 1824 CBS_init(&cbs, s->internal->init_msg, n); 1825 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1826 #if UINT32_MAX > LONG_MAX 1827 lifetime_hint > LONG_MAX || 1828 #endif 1829 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1830 CBS_len(&cbs) != 0) { 1831 al = SSL_AD_DECODE_ERROR; 1832 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1833 goto f_err; 1834 } 1835 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1836 1837 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1838 &s->session->tlsext_ticklen)) { 1839 SSLerror(s, ERR_R_MALLOC_FAILURE); 1840 goto err; 1841 } 1842 1843 /* 1844 * There are two ways to detect a resumed ticket sesion. 1845 * One is to set an appropriate session ID and then the server 1846 * must return a match in ServerHello. This allows the normal 1847 * client session ID matching to work and we know much 1848 * earlier that the ticket has been accepted. 1849 * 1850 * The other way is to set zero length session ID when the 1851 * ticket is presented and rely on the handshake to determine 1852 * session resumption. 1853 * 1854 * We choose the former approach because this fits in with 1855 * assumptions elsewhere in OpenSSL. The session ID is set 1856 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1857 * ticket. 1858 */ 1859 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1860 s->session->session_id, &s->session->session_id_length, 1861 EVP_sha256(), NULL); 1862 ret = 1; 1863 return (ret); 1864 f_err: 1865 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1866 err: 1867 return (-1); 1868 } 1869 1870 int 1871 ssl3_get_cert_status(SSL *s) 1872 { 1873 CBS cert_status, response; 1874 int ok, al; 1875 long n; 1876 uint8_t status_type; 1877 1878 n = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1879 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 1880 16384, &ok); 1881 if (!ok) 1882 return ((int)n); 1883 1884 if (n < 0) { 1885 /* need at least status type + length */ 1886 al = SSL_AD_DECODE_ERROR; 1887 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1888 goto f_err; 1889 } 1890 1891 CBS_init(&cert_status, s->internal->init_msg, n); 1892 if (!CBS_get_u8(&cert_status, &status_type) || 1893 CBS_len(&cert_status) < 3) { 1894 /* need at least status type + length */ 1895 al = SSL_AD_DECODE_ERROR; 1896 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1897 goto f_err; 1898 } 1899 1900 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1901 al = SSL_AD_DECODE_ERROR; 1902 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1903 goto f_err; 1904 } 1905 1906 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1907 CBS_len(&cert_status) != 0) { 1908 al = SSL_AD_DECODE_ERROR; 1909 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1910 goto f_err; 1911 } 1912 1913 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1914 &s->internal->tlsext_ocsp_resp_len)) { 1915 al = SSL_AD_INTERNAL_ERROR; 1916 SSLerror(s, ERR_R_MALLOC_FAILURE); 1917 goto f_err; 1918 } 1919 1920 if (s->ctx->internal->tlsext_status_cb) { 1921 int ret; 1922 ret = s->ctx->internal->tlsext_status_cb(s, 1923 s->ctx->internal->tlsext_status_arg); 1924 if (ret == 0) { 1925 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1926 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1927 goto f_err; 1928 } 1929 if (ret < 0) { 1930 al = SSL_AD_INTERNAL_ERROR; 1931 SSLerror(s, ERR_R_MALLOC_FAILURE); 1932 goto f_err; 1933 } 1934 } 1935 return (1); 1936 f_err: 1937 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1938 return (-1); 1939 } 1940 1941 int 1942 ssl3_get_server_done(SSL *s) 1943 { 1944 int ok, ret = 0; 1945 long n; 1946 1947 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1948 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1949 30, /* should be very small, like 0 :-) */ &ok); 1950 if (!ok) 1951 return ((int)n); 1952 1953 if (n > 0) { 1954 /* should contain no data */ 1955 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1956 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1957 return (-1); 1958 } 1959 ret = 1; 1960 return (ret); 1961 } 1962 1963 static int 1964 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1965 { 1966 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1967 unsigned char *enc_pms = NULL; 1968 EVP_PKEY *pkey = NULL; 1969 int ret = -1; 1970 int enc_len; 1971 CBB epms; 1972 1973 /* 1974 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1975 */ 1976 1977 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA].x509); 1978 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1979 pkey->pkey.rsa == NULL) { 1980 SSLerror(s, ERR_R_INTERNAL_ERROR); 1981 goto err; 1982 } 1983 1984 pms[0] = s->client_version >> 8; 1985 pms[1] = s->client_version & 0xff; 1986 arc4random_buf(&pms[2], sizeof(pms) - 2); 1987 1988 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1989 SSLerror(s, ERR_R_MALLOC_FAILURE); 1990 goto err; 1991 } 1992 1993 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 1994 RSA_PKCS1_PADDING); 1995 if (enc_len <= 0) { 1996 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1997 goto err; 1998 } 1999 2000 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 2001 goto err; 2002 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 2003 goto err; 2004 if (!CBB_flush(cbb)) 2005 goto err; 2006 2007 s->session->master_key_length = 2008 tls1_generate_master_secret(s, 2009 s->session->master_key, pms, sizeof(pms)); 2010 2011 ret = 1; 2012 2013 err: 2014 explicit_bzero(pms, sizeof(pms)); 2015 EVP_PKEY_free(pkey); 2016 free(enc_pms); 2017 2018 return (ret); 2019 } 2020 2021 static int 2022 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2023 { 2024 DH *dh_srvr = NULL, *dh_clnt = NULL; 2025 unsigned char *key = NULL; 2026 int key_size = 0, key_len; 2027 unsigned char *data; 2028 int ret = -1; 2029 CBB dh_Yc; 2030 2031 /* Ensure that we have an ephemeral key for DHE. */ 2032 if (sess_cert->peer_dh_tmp == NULL) { 2033 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2034 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 2035 goto err; 2036 } 2037 dh_srvr = sess_cert->peer_dh_tmp; 2038 2039 /* Generate a new random key. */ 2040 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2041 SSLerror(s, ERR_R_DH_LIB); 2042 goto err; 2043 } 2044 if (!DH_generate_key(dh_clnt)) { 2045 SSLerror(s, ERR_R_DH_LIB); 2046 goto err; 2047 } 2048 if ((key_size = DH_size(dh_clnt)) <= 0) { 2049 SSLerror(s, ERR_R_DH_LIB); 2050 goto err; 2051 } 2052 if ((key = malloc(key_size)) == NULL) { 2053 SSLerror(s, ERR_R_MALLOC_FAILURE); 2054 goto err; 2055 } 2056 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) { 2057 SSLerror(s, ERR_R_DH_LIB); 2058 goto err; 2059 } 2060 2061 /* Generate master key from the result. */ 2062 s->session->master_key_length = 2063 tls1_generate_master_secret(s, 2064 s->session->master_key, key, key_len); 2065 2066 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2067 goto err; 2068 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2069 goto err; 2070 BN_bn2bin(dh_clnt->pub_key, data); 2071 if (!CBB_flush(cbb)) 2072 goto err; 2073 2074 ret = 1; 2075 2076 err: 2077 DH_free(dh_clnt); 2078 freezero(key, key_size); 2079 2080 return (ret); 2081 } 2082 2083 static int 2084 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2085 { 2086 EC_KEY *ecdh = NULL; 2087 uint8_t *key = NULL; 2088 size_t key_len = 0; 2089 int ret = -1; 2090 CBB ecpoint; 2091 2092 if ((ecdh = EC_KEY_new()) == NULL) { 2093 SSLerror(s, ERR_R_MALLOC_FAILURE); 2094 goto err; 2095 } 2096 2097 if (!ssl_kex_generate_ecdhe_ecp(ecdh, sc->peer_nid)) 2098 goto err; 2099 2100 /* Encode our public key. */ 2101 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2102 goto err; 2103 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 2104 goto err; 2105 if (!CBB_flush(cbb)) 2106 goto err; 2107 2108 if (!ssl_kex_derive_ecdhe_ecp(ecdh, sc->peer_ecdh_tmp, &key, &key_len)) 2109 goto err; 2110 s->session->master_key_length = tls1_generate_master_secret(s, 2111 s->session->master_key, key, key_len); 2112 2113 ret = 1; 2114 2115 err: 2116 freezero(key, key_len); 2117 EC_KEY_free(ecdh); 2118 2119 return (ret); 2120 } 2121 2122 static int 2123 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2124 { 2125 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2126 int ret = -1; 2127 CBB ecpoint; 2128 2129 /* Generate X25519 key pair and derive shared key. */ 2130 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2131 goto err; 2132 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2133 goto err; 2134 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2135 goto err; 2136 X25519_keypair(public_key, private_key); 2137 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2138 goto err; 2139 2140 /* Serialize the public key. */ 2141 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2142 goto err; 2143 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2144 goto err; 2145 if (!CBB_flush(cbb)) 2146 goto err; 2147 2148 /* Generate master key from the result. */ 2149 s->session->master_key_length = 2150 tls1_generate_master_secret(s, 2151 s->session->master_key, shared_key, X25519_KEY_LENGTH); 2152 2153 ret = 1; 2154 2155 err: 2156 free(public_key); 2157 freezero(private_key, X25519_KEY_LENGTH); 2158 freezero(shared_key, X25519_KEY_LENGTH); 2159 2160 return (ret); 2161 } 2162 2163 static int 2164 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2165 { 2166 if (sc->peer_x25519_tmp != NULL) { 2167 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2168 goto err; 2169 } else if (sc->peer_ecdh_tmp != NULL) { 2170 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2171 goto err; 2172 } else { 2173 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2174 SSLerror(s, ERR_R_INTERNAL_ERROR); 2175 goto err; 2176 } 2177 2178 return (1); 2179 2180 err: 2181 return (-1); 2182 } 2183 2184 static int 2185 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2186 { 2187 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2188 EVP_PKEY *pub_key = NULL; 2189 EVP_PKEY_CTX *pkey_ctx; 2190 X509 *peer_cert; 2191 size_t msglen; 2192 unsigned int md_len; 2193 EVP_MD_CTX *ukm_hash; 2194 int ret = -1; 2195 int nid; 2196 CBB gostblob; 2197 2198 /* Get server sertificate PKEY and create ctx from it */ 2199 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2200 if (peer_cert == NULL) { 2201 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2202 goto err; 2203 } 2204 2205 pub_key = X509_get_pubkey(peer_cert); 2206 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2207 2208 /* 2209 * If we have send a certificate, and certificate key parameters match 2210 * those of server certificate, use certificate key for key exchange. 2211 * Otherwise, generate ephemeral key pair. 2212 */ 2213 EVP_PKEY_encrypt_init(pkey_ctx); 2214 2215 /* Generate session key. */ 2216 arc4random_buf(premaster_secret, 32); 2217 2218 /* 2219 * If we have client certificate, use its secret as peer key. 2220 */ 2221 if (S3I(s)->tmp.cert_req && s->cert->key->privatekey) { 2222 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2223 s->cert->key->privatekey) <=0) { 2224 /* 2225 * If there was an error - just ignore it. 2226 * Ephemeral key would be used. 2227 */ 2228 ERR_clear_error(); 2229 } 2230 } 2231 2232 /* 2233 * Compute shared IV and store it in algorithm-specific context data. 2234 */ 2235 ukm_hash = EVP_MD_CTX_new(); 2236 if (ukm_hash == NULL) { 2237 SSLerror(s, ERR_R_MALLOC_FAILURE); 2238 goto err; 2239 } 2240 2241 /* XXX check handshake hash instead. */ 2242 if (S3I(s)->hs.new_cipher->algorithm2 & SSL_HANDSHAKE_MAC_GOST94) 2243 nid = NID_id_GostR3411_94; 2244 else 2245 nid = NID_id_tc26_gost3411_2012_256; 2246 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2247 goto err; 2248 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2249 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2250 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2251 EVP_MD_CTX_free(ukm_hash); 2252 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2253 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2254 SSLerror(s, SSL_R_LIBRARY_BUG); 2255 goto err; 2256 } 2257 2258 /* 2259 * Make GOST keytransport blob message, encapsulate it into sequence. 2260 */ 2261 msglen = 255; 2262 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2263 32) < 0) { 2264 SSLerror(s, SSL_R_LIBRARY_BUG); 2265 goto err; 2266 } 2267 2268 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2269 goto err; 2270 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2271 goto err; 2272 if (!CBB_flush(cbb)) 2273 goto err; 2274 2275 /* Check if pubkey from client certificate was used. */ 2276 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2277 NULL) > 0) { 2278 /* Set flag "skip certificate verify". */ 2279 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2280 } 2281 EVP_PKEY_CTX_free(pkey_ctx); 2282 s->session->master_key_length = 2283 tls1_generate_master_secret(s, 2284 s->session->master_key, premaster_secret, 32); 2285 2286 ret = 1; 2287 2288 err: 2289 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2290 EVP_PKEY_free(pub_key); 2291 2292 return (ret); 2293 } 2294 2295 int 2296 ssl3_send_client_key_exchange(SSL *s) 2297 { 2298 SESS_CERT *sess_cert; 2299 unsigned long alg_k; 2300 CBB cbb, kex; 2301 2302 memset(&cbb, 0, sizeof(cbb)); 2303 2304 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2305 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2306 2307 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2308 ssl3_send_alert(s, SSL3_AL_FATAL, 2309 SSL_AD_UNEXPECTED_MESSAGE); 2310 SSLerror(s, ERR_R_INTERNAL_ERROR); 2311 goto err; 2312 } 2313 2314 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2315 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2316 goto err; 2317 2318 if (alg_k & SSL_kRSA) { 2319 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2320 goto err; 2321 } else if (alg_k & SSL_kDHE) { 2322 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2323 goto err; 2324 } else if (alg_k & SSL_kECDHE) { 2325 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2326 goto err; 2327 } else if (alg_k & SSL_kGOST) { 2328 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2329 goto err; 2330 } else { 2331 ssl3_send_alert(s, SSL3_AL_FATAL, 2332 SSL_AD_HANDSHAKE_FAILURE); 2333 SSLerror(s, ERR_R_INTERNAL_ERROR); 2334 goto err; 2335 } 2336 2337 if (!ssl3_handshake_msg_finish(s, &cbb)) 2338 goto err; 2339 2340 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2341 } 2342 2343 /* SSL3_ST_CW_KEY_EXCH_B */ 2344 return (ssl3_handshake_write(s)); 2345 2346 err: 2347 CBB_cleanup(&cbb); 2348 2349 return (-1); 2350 } 2351 2352 static int 2353 ssl3_send_client_verify_sigalgs(SSL *s, CBB *cert_verify) 2354 { 2355 const struct ssl_sigalg *sigalg; 2356 CBB cbb_signature; 2357 EVP_PKEY_CTX *pctx = NULL; 2358 EVP_PKEY *pkey; 2359 EVP_MD_CTX mctx; 2360 const EVP_MD *md; 2361 const unsigned char *hdata; 2362 unsigned char *signature = NULL; 2363 size_t signature_len, hdata_len; 2364 int ret = 0; 2365 2366 EVP_MD_CTX_init(&mctx); 2367 2368 pkey = s->cert->key->privatekey; 2369 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2370 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2371 goto err; 2372 } 2373 if ((md = sigalg->md()) == NULL) { 2374 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 2375 goto err; 2376 } 2377 2378 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2379 SSLerror(s, ERR_R_INTERNAL_ERROR); 2380 goto err; 2381 } 2382 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2383 SSLerror(s, ERR_R_EVP_LIB); 2384 goto err; 2385 } 2386 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2387 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2388 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2389 SSLerror(s, ERR_R_EVP_LIB); 2390 goto err; 2391 } 2392 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2393 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2394 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2395 SSLerror(s, ERR_R_EVP_LIB); 2396 goto err; 2397 } 2398 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2399 SSLerror(s, ERR_R_EVP_LIB); 2400 goto err; 2401 } 2402 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2403 signature_len == 0) { 2404 SSLerror(s, ERR_R_EVP_LIB); 2405 goto err; 2406 } 2407 if ((signature = calloc(1, signature_len)) == NULL) { 2408 SSLerror(s, ERR_R_MALLOC_FAILURE); 2409 goto err; 2410 } 2411 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2412 SSLerror(s, ERR_R_EVP_LIB); 2413 goto err; 2414 } 2415 2416 if (!CBB_add_u16(cert_verify, sigalg->value)) 2417 goto err; 2418 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2419 goto err; 2420 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2421 goto err; 2422 if (!CBB_flush(cert_verify)) 2423 goto err; 2424 2425 ret = 1; 2426 2427 err: 2428 EVP_MD_CTX_cleanup(&mctx); 2429 free(signature); 2430 return ret; 2431 } 2432 2433 static int 2434 ssl3_send_client_verify_rsa(SSL *s, CBB *cert_verify) 2435 { 2436 CBB cbb_signature; 2437 EVP_PKEY *pkey; 2438 unsigned char data[EVP_MAX_MD_SIZE]; 2439 unsigned char *signature = NULL; 2440 unsigned int signature_len; 2441 size_t data_len; 2442 int ret = 0; 2443 2444 pkey = s->cert->key->privatekey; 2445 2446 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2447 goto err; 2448 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2449 goto err; 2450 if (RSA_sign(NID_md5_sha1, data, data_len, signature, 2451 &signature_len, pkey->pkey.rsa) <= 0 ) { 2452 SSLerror(s, ERR_R_RSA_LIB); 2453 goto err; 2454 } 2455 2456 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2457 goto err; 2458 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2459 goto err; 2460 if (!CBB_flush(cert_verify)) 2461 goto err; 2462 2463 ret = 1; 2464 err: 2465 free(signature); 2466 return ret; 2467 } 2468 2469 static int 2470 ssl3_send_client_verify_ec(SSL *s, CBB *cert_verify) 2471 { 2472 CBB cbb_signature; 2473 EVP_PKEY *pkey; 2474 unsigned char data[EVP_MAX_MD_SIZE]; 2475 unsigned char *signature = NULL; 2476 unsigned int signature_len; 2477 int ret = 0; 2478 2479 pkey = s->cert->key->privatekey; 2480 2481 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2482 goto err; 2483 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2484 goto err; 2485 if (!ECDSA_sign(pkey->save_type, &data[MD5_DIGEST_LENGTH], 2486 SHA_DIGEST_LENGTH, signature, &signature_len, pkey->pkey.ec)) { 2487 SSLerror(s, ERR_R_ECDSA_LIB); 2488 goto err; 2489 } 2490 2491 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2492 goto err; 2493 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2494 goto err; 2495 if (!CBB_flush(cert_verify)) 2496 goto err; 2497 2498 ret = 1; 2499 err: 2500 free(signature); 2501 return ret; 2502 } 2503 2504 #ifndef OPENSSL_NO_GOST 2505 static int 2506 ssl3_send_client_verify_gost(SSL *s, CBB *cert_verify) 2507 { 2508 CBB cbb_signature; 2509 EVP_MD_CTX mctx; 2510 EVP_PKEY_CTX *pctx; 2511 EVP_PKEY *pkey; 2512 const EVP_MD *md; 2513 const unsigned char *hdata; 2514 unsigned char *signature = NULL; 2515 size_t signature_len; 2516 size_t hdata_len; 2517 int nid; 2518 int ret = 0; 2519 2520 EVP_MD_CTX_init(&mctx); 2521 2522 pkey = s->cert->key->privatekey; 2523 2524 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2525 SSLerror(s, ERR_R_INTERNAL_ERROR); 2526 goto err; 2527 } 2528 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2529 (md = EVP_get_digestbynid(nid)) == NULL) { 2530 SSLerror(s, ERR_R_EVP_LIB); 2531 goto err; 2532 } 2533 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2534 SSLerror(s, ERR_R_EVP_LIB); 2535 goto err; 2536 } 2537 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2538 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2539 SSLerror(s, ERR_R_EVP_LIB); 2540 goto err; 2541 } 2542 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2543 SSLerror(s, ERR_R_EVP_LIB); 2544 goto err; 2545 } 2546 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2547 signature_len == 0) { 2548 SSLerror(s, ERR_R_EVP_LIB); 2549 goto err; 2550 } 2551 if ((signature = calloc(1, signature_len)) == NULL) { 2552 SSLerror(s, ERR_R_MALLOC_FAILURE); 2553 goto err; 2554 } 2555 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2556 SSLerror(s, ERR_R_EVP_LIB); 2557 goto err; 2558 } 2559 2560 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2561 goto err; 2562 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2563 goto err; 2564 if (!CBB_flush(cert_verify)) 2565 goto err; 2566 2567 ret = 1; 2568 err: 2569 EVP_MD_CTX_cleanup(&mctx); 2570 free(signature); 2571 return ret; 2572 } 2573 #endif 2574 2575 int 2576 ssl3_send_client_verify(SSL *s) 2577 { 2578 CBB cbb, cert_verify; 2579 EVP_PKEY *pkey; 2580 2581 memset(&cbb, 0, sizeof(cbb)); 2582 2583 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2584 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2585 SSL3_MT_CERTIFICATE_VERIFY)) 2586 goto err; 2587 2588 pkey = s->cert->key->privatekey; 2589 2590 /* 2591 * For TLS v1.2 send signature algorithm and signature 2592 * using agreed digest and cached handshake records. 2593 */ 2594 if (SSL_USE_SIGALGS(s)) { 2595 if (!ssl3_send_client_verify_sigalgs(s, &cert_verify)) 2596 goto err; 2597 } else if (pkey->type == EVP_PKEY_RSA) { 2598 if (!ssl3_send_client_verify_rsa(s, &cert_verify)) 2599 goto err; 2600 } else if (pkey->type == EVP_PKEY_EC) { 2601 if (!ssl3_send_client_verify_ec(s, &cert_verify)) 2602 goto err; 2603 #ifndef OPENSSL_NO_GOST 2604 } else if (pkey->type == NID_id_GostR3410_94 || 2605 pkey->type == NID_id_GostR3410_2001) { 2606 if (!ssl3_send_client_verify_gost(s, &cert_verify)) 2607 goto err; 2608 #endif 2609 } else { 2610 SSLerror(s, ERR_R_INTERNAL_ERROR); 2611 goto err; 2612 } 2613 2614 tls1_transcript_free(s); 2615 2616 if (!ssl3_handshake_msg_finish(s, &cbb)) 2617 goto err; 2618 2619 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2620 } 2621 2622 return (ssl3_handshake_write(s)); 2623 2624 err: 2625 CBB_cleanup(&cbb); 2626 2627 return (-1); 2628 } 2629 2630 int 2631 ssl3_send_client_certificate(SSL *s) 2632 { 2633 EVP_PKEY *pkey = NULL; 2634 X509 *x509 = NULL; 2635 CBB cbb, client_cert; 2636 int i; 2637 2638 memset(&cbb, 0, sizeof(cbb)); 2639 2640 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2641 if (s->cert->key->x509 == NULL || 2642 s->cert->key->privatekey == NULL) 2643 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2644 else 2645 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2646 } 2647 2648 /* We need to get a client cert */ 2649 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2650 /* 2651 * If we get an error, we need to 2652 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 2653 * We then get retied later 2654 */ 2655 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2656 if (i < 0) { 2657 s->internal->rwstate = SSL_X509_LOOKUP; 2658 return (-1); 2659 } 2660 s->internal->rwstate = SSL_NOTHING; 2661 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2662 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2663 if (!SSL_use_certificate(s, x509) || 2664 !SSL_use_PrivateKey(s, pkey)) 2665 i = 0; 2666 } else if (i == 1) { 2667 i = 0; 2668 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2669 } 2670 2671 X509_free(x509); 2672 EVP_PKEY_free(pkey); 2673 if (i == 0) { 2674 S3I(s)->tmp.cert_req = 2; 2675 2676 /* There is no client certificate to verify. */ 2677 tls1_transcript_free(s); 2678 } 2679 2680 /* Ok, we have a cert */ 2681 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2682 } 2683 2684 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2685 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2686 SSL3_MT_CERTIFICATE)) 2687 goto err; 2688 if (!ssl3_output_cert_chain(s, &client_cert, 2689 (S3I(s)->tmp.cert_req == 2) ? NULL : s->cert->key)) 2690 goto err; 2691 if (!ssl3_handshake_msg_finish(s, &cbb)) 2692 goto err; 2693 2694 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2695 } 2696 2697 /* SSL3_ST_CW_CERT_D */ 2698 return (ssl3_handshake_write(s)); 2699 2700 err: 2701 CBB_cleanup(&cbb); 2702 2703 return (0); 2704 } 2705 2706 #define has_bits(i,m) (((i)&(m)) == (m)) 2707 2708 int 2709 ssl3_check_cert_and_algorithm(SSL *s) 2710 { 2711 int i, idx; 2712 long alg_k, alg_a; 2713 EVP_PKEY *pkey = NULL; 2714 SESS_CERT *sc; 2715 DH *dh; 2716 2717 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2718 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 2719 2720 /* We don't have a certificate. */ 2721 if (alg_a & SSL_aNULL) 2722 return (1); 2723 2724 sc = SSI(s)->sess_cert; 2725 if (sc == NULL) { 2726 SSLerror(s, ERR_R_INTERNAL_ERROR); 2727 goto err; 2728 } 2729 dh = SSI(s)->sess_cert->peer_dh_tmp; 2730 2731 /* This is the passed certificate. */ 2732 2733 idx = sc->peer_cert_type; 2734 if (idx == SSL_PKEY_ECC) { 2735 if (ssl_check_srvr_ecc_cert_and_alg( 2736 sc->peer_pkeys[idx].x509, s) == 0) { 2737 /* check failed */ 2738 SSLerror(s, SSL_R_BAD_ECC_CERT); 2739 goto f_err; 2740 } else { 2741 return (1); 2742 } 2743 } 2744 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2745 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2746 EVP_PKEY_free(pkey); 2747 2748 /* Check that we have a certificate if we require one. */ 2749 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2750 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2751 goto f_err; 2752 } 2753 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2754 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2755 goto f_err; 2756 } 2757 if ((alg_k & SSL_kDHE) && 2758 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2759 SSLerror(s, SSL_R_MISSING_DH_KEY); 2760 goto f_err; 2761 } 2762 2763 return (1); 2764 f_err: 2765 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2766 err: 2767 return (0); 2768 } 2769 2770 /* 2771 * Check to see if handshake is full or resumed. Usually this is just a 2772 * case of checking to see if a cache hit has occurred. In the case of 2773 * session tickets we have to check the next message to be sure. 2774 */ 2775 2776 int 2777 ssl3_check_finished(SSL *s) 2778 { 2779 int ok; 2780 long n; 2781 2782 /* If we have no ticket it cannot be a resumed session. */ 2783 if (!s->session->tlsext_tick) 2784 return (1); 2785 /* this function is called when we really expect a Certificate 2786 * message, so permit appropriate message length */ 2787 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2788 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2789 if (!ok) 2790 return ((int)n); 2791 2792 S3I(s)->tmp.reuse_message = 1; 2793 if ((S3I(s)->tmp.message_type == SSL3_MT_FINISHED) || 2794 (S3I(s)->tmp.message_type == SSL3_MT_NEWSESSION_TICKET)) 2795 return (2); 2796 2797 return (1); 2798 } 2799 2800 int 2801 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2802 { 2803 int i = 0; 2804 2805 #ifndef OPENSSL_NO_ENGINE 2806 if (s->ctx->internal->client_cert_engine) { 2807 i = ENGINE_load_ssl_client_cert( 2808 s->ctx->internal->client_cert_engine, s, 2809 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2810 if (i != 0) 2811 return (i); 2812 } 2813 #endif 2814 if (s->ctx->internal->client_cert_cb) 2815 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2816 return (i); 2817 } 2818