1 /* $OpenBSD: ssl_clnt.c,v 1.93 2021/04/25 13:15:22 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 if (!ssl_supported_tls_version_range(s, 222 &S3I(s)->hs.our_min_tls_version, 223 &S3I(s)->hs.our_max_tls_version)) { 224 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 225 ret = -1; 226 goto end; 227 } 228 229 if (!ssl3_setup_init_buffer(s)) { 230 ret = -1; 231 goto end; 232 } 233 if (!ssl3_setup_buffers(s)) { 234 ret = -1; 235 goto end; 236 } 237 if (!ssl_init_wbio_buffer(s, 0)) { 238 ret = -1; 239 goto end; 240 } 241 242 /* don't push the buffering BIO quite yet */ 243 244 if (!tls1_transcript_init(s)) { 245 ret = -1; 246 goto end; 247 } 248 249 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 250 s->ctx->internal->stats.sess_connect++; 251 s->internal->init_num = 0; 252 253 if (SSL_is_dtls(s)) { 254 /* mark client_random uninitialized */ 255 memset(s->s3->client_random, 0, 256 sizeof(s->s3->client_random)); 257 D1I(s)->send_cookie = 0; 258 s->internal->hit = 0; 259 } 260 break; 261 262 case SSL3_ST_CW_CLNT_HELLO_A: 263 case SSL3_ST_CW_CLNT_HELLO_B: 264 s->internal->shutdown = 0; 265 266 if (SSL_is_dtls(s)) { 267 /* every DTLS ClientHello resets Finished MAC */ 268 tls1_transcript_reset(s); 269 270 dtls1_start_timer(s); 271 } 272 273 ret = ssl3_send_client_hello(s); 274 if (ret <= 0) 275 goto end; 276 277 if (SSL_is_dtls(s) && D1I(s)->send_cookie) { 278 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 279 S3I(s)->hs.tls12.next_state = SSL3_ST_CR_SRVR_HELLO_A; 280 } else 281 S3I(s)->hs.state = SSL3_ST_CR_SRVR_HELLO_A; 282 283 s->internal->init_num = 0; 284 285 /* turn on buffering for the next lot of output */ 286 if (s->bbio != s->wbio) 287 s->wbio = BIO_push(s->bbio, s->wbio); 288 289 break; 290 291 case SSL3_ST_CR_SRVR_HELLO_A: 292 case SSL3_ST_CR_SRVR_HELLO_B: 293 ret = ssl3_get_server_hello(s); 294 if (ret <= 0) 295 goto end; 296 297 if (s->internal->hit) { 298 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 299 if (!SSL_is_dtls(s)) { 300 if (s->internal->tlsext_ticket_expected) { 301 /* receive renewed session ticket */ 302 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 303 } 304 305 /* No client certificate verification. */ 306 tls1_transcript_free(s); 307 } 308 } else if (SSL_is_dtls(s)) { 309 S3I(s)->hs.state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 310 } else { 311 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 312 } 313 s->internal->init_num = 0; 314 break; 315 316 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 317 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 318 ret = ssl3_get_dtls_hello_verify(s); 319 if (ret <= 0) 320 goto end; 321 dtls1_stop_timer(s); 322 if (D1I(s)->send_cookie) /* start again, with a cookie */ 323 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 324 else 325 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 326 s->internal->init_num = 0; 327 break; 328 329 case SSL3_ST_CR_CERT_A: 330 case SSL3_ST_CR_CERT_B: 331 ret = ssl3_check_finished(s); 332 if (ret <= 0) 333 goto end; 334 if (ret == 2) { 335 s->internal->hit = 1; 336 if (s->internal->tlsext_ticket_expected) 337 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 338 else 339 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 340 s->internal->init_num = 0; 341 break; 342 } 343 /* Check if it is anon DH/ECDH. */ 344 if (!(S3I(s)->hs.cipher->algorithm_auth & 345 SSL_aNULL)) { 346 ret = ssl3_get_server_certificate(s); 347 if (ret <= 0) 348 goto end; 349 if (s->internal->tlsext_status_expected) 350 S3I(s)->hs.state = SSL3_ST_CR_CERT_STATUS_A; 351 else 352 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 353 } else { 354 skip = 1; 355 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 356 } 357 s->internal->init_num = 0; 358 break; 359 360 case SSL3_ST_CR_KEY_EXCH_A: 361 case SSL3_ST_CR_KEY_EXCH_B: 362 ret = ssl3_get_server_key_exchange(s); 363 if (ret <= 0) 364 goto end; 365 S3I(s)->hs.state = SSL3_ST_CR_CERT_REQ_A; 366 s->internal->init_num = 0; 367 368 /* 369 * At this point we check that we have the 370 * required stuff from the server. 371 */ 372 if (!ssl3_check_cert_and_algorithm(s)) { 373 ret = -1; 374 goto end; 375 } 376 break; 377 378 case SSL3_ST_CR_CERT_REQ_A: 379 case SSL3_ST_CR_CERT_REQ_B: 380 ret = ssl3_get_certificate_request(s); 381 if (ret <= 0) 382 goto end; 383 S3I(s)->hs.state = SSL3_ST_CR_SRVR_DONE_A; 384 s->internal->init_num = 0; 385 break; 386 387 case SSL3_ST_CR_SRVR_DONE_A: 388 case SSL3_ST_CR_SRVR_DONE_B: 389 ret = ssl3_get_server_done(s); 390 if (ret <= 0) 391 goto end; 392 if (SSL_is_dtls(s)) 393 dtls1_stop_timer(s); 394 if (S3I(s)->hs.tls12.cert_request) 395 S3I(s)->hs.state = SSL3_ST_CW_CERT_A; 396 else 397 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 398 s->internal->init_num = 0; 399 400 break; 401 402 case SSL3_ST_CW_CERT_A: 403 case SSL3_ST_CW_CERT_B: 404 case SSL3_ST_CW_CERT_C: 405 case SSL3_ST_CW_CERT_D: 406 if (SSL_is_dtls(s)) 407 dtls1_start_timer(s); 408 ret = ssl3_send_client_certificate(s); 409 if (ret <= 0) 410 goto end; 411 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 412 s->internal->init_num = 0; 413 break; 414 415 case SSL3_ST_CW_KEY_EXCH_A: 416 case SSL3_ST_CW_KEY_EXCH_B: 417 if (SSL_is_dtls(s)) 418 dtls1_start_timer(s); 419 ret = ssl3_send_client_key_exchange(s); 420 if (ret <= 0) 421 goto end; 422 /* 423 * EAY EAY EAY need to check for DH fix cert 424 * sent back 425 */ 426 /* 427 * For TLS, cert_req is set to 2, so a cert chain 428 * of nothing is sent, but no verify packet is sent 429 */ 430 /* 431 * XXX: For now, we do not support client 432 * authentication in ECDH cipher suites with 433 * ECDH (rather than ECDSA) certificates. 434 * We need to skip the certificate verify 435 * message when client's ECDH public key is sent 436 * inside the client certificate. 437 */ 438 if (S3I(s)->hs.tls12.cert_request == 1) { 439 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_A; 440 } else { 441 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 442 S3I(s)->change_cipher_spec = 0; 443 } 444 if (!SSL_is_dtls(s)) { 445 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 446 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 447 S3I(s)->change_cipher_spec = 0; 448 } 449 } 450 451 s->internal->init_num = 0; 452 break; 453 454 case SSL3_ST_CW_CERT_VRFY_A: 455 case SSL3_ST_CW_CERT_VRFY_B: 456 if (SSL_is_dtls(s)) 457 dtls1_start_timer(s); 458 ret = ssl3_send_client_verify(s); 459 if (ret <= 0) 460 goto end; 461 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 462 s->internal->init_num = 0; 463 S3I(s)->change_cipher_spec = 0; 464 break; 465 466 case SSL3_ST_CW_CHANGE_A: 467 case SSL3_ST_CW_CHANGE_B: 468 if (SSL_is_dtls(s) && !s->internal->hit) 469 dtls1_start_timer(s); 470 ret = ssl3_send_change_cipher_spec(s, 471 SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B); 472 if (ret <= 0) 473 goto end; 474 475 S3I(s)->hs.state = SSL3_ST_CW_FINISHED_A; 476 s->internal->init_num = 0; 477 478 s->session->cipher = S3I(s)->hs.cipher; 479 if (!tls1_setup_key_block(s)) { 480 ret = -1; 481 goto end; 482 } 483 484 if (!tls1_change_cipher_state(s, 485 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) { 486 ret = -1; 487 goto end; 488 } 489 490 if (SSL_is_dtls(s)) 491 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 492 493 break; 494 495 case SSL3_ST_CW_FINISHED_A: 496 case SSL3_ST_CW_FINISHED_B: 497 if (SSL_is_dtls(s) && !s->internal->hit) 498 dtls1_start_timer(s); 499 ret = ssl3_send_finished(s, SSL3_ST_CW_FINISHED_A, 500 SSL3_ST_CW_FINISHED_B); 501 if (ret <= 0) 502 goto end; 503 if (!SSL_is_dtls(s)) 504 s->s3->flags |= SSL3_FLAGS_CCS_OK; 505 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 506 507 /* clear flags */ 508 if (s->internal->hit) { 509 S3I(s)->hs.tls12.next_state = SSL_ST_OK; 510 } else { 511 /* Allow NewSessionTicket if ticket expected */ 512 if (s->internal->tlsext_ticket_expected) 513 S3I(s)->hs.tls12.next_state = 514 SSL3_ST_CR_SESSION_TICKET_A; 515 else 516 S3I(s)->hs.tls12.next_state = 517 SSL3_ST_CR_FINISHED_A; 518 } 519 s->internal->init_num = 0; 520 break; 521 522 case SSL3_ST_CR_SESSION_TICKET_A: 523 case SSL3_ST_CR_SESSION_TICKET_B: 524 ret = ssl3_get_new_session_ticket(s); 525 if (ret <= 0) 526 goto end; 527 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 528 s->internal->init_num = 0; 529 break; 530 531 case SSL3_ST_CR_CERT_STATUS_A: 532 case SSL3_ST_CR_CERT_STATUS_B: 533 ret = ssl3_get_cert_status(s); 534 if (ret <= 0) 535 goto end; 536 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 537 s->internal->init_num = 0; 538 break; 539 540 case SSL3_ST_CR_FINISHED_A: 541 case SSL3_ST_CR_FINISHED_B: 542 if (SSL_is_dtls(s)) 543 D1I(s)->change_cipher_spec_ok = 1; 544 else 545 s->s3->flags |= SSL3_FLAGS_CCS_OK; 546 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 547 SSL3_ST_CR_FINISHED_B); 548 if (ret <= 0) 549 goto end; 550 if (SSL_is_dtls(s)) 551 dtls1_stop_timer(s); 552 553 if (s->internal->hit) 554 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 555 else 556 S3I(s)->hs.state = SSL_ST_OK; 557 s->internal->init_num = 0; 558 break; 559 560 case SSL3_ST_CW_FLUSH: 561 s->internal->rwstate = SSL_WRITING; 562 if (BIO_flush(s->wbio) <= 0) { 563 if (SSL_is_dtls(s)) { 564 /* If the write error was fatal, stop trying */ 565 if (!BIO_should_retry(s->wbio)) { 566 s->internal->rwstate = SSL_NOTHING; 567 S3I(s)->hs.state = S3I(s)->hs.tls12.next_state; 568 } 569 } 570 ret = -1; 571 goto end; 572 } 573 s->internal->rwstate = SSL_NOTHING; 574 S3I(s)->hs.state = S3I(s)->hs.tls12.next_state; 575 break; 576 577 case SSL_ST_OK: 578 /* clean a few things up */ 579 tls1_cleanup_key_block(s); 580 581 if (S3I(s)->handshake_transcript != NULL) { 582 SSLerror(s, ERR_R_INTERNAL_ERROR); 583 ret = -1; 584 goto end; 585 } 586 587 if (!SSL_is_dtls(s)) 588 ssl3_release_init_buffer(s); 589 590 ssl_free_wbio_buffer(s); 591 592 s->internal->init_num = 0; 593 s->internal->renegotiate = 0; 594 s->internal->new_session = 0; 595 596 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 597 if (s->internal->hit) 598 s->ctx->internal->stats.sess_hit++; 599 600 ret = 1; 601 /* s->server=0; */ 602 s->internal->handshake_func = ssl3_connect; 603 s->ctx->internal->stats.sess_connect_good++; 604 605 if (cb != NULL) 606 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 607 608 if (SSL_is_dtls(s)) { 609 /* done with handshaking */ 610 D1I(s)->handshake_read_seq = 0; 611 D1I(s)->next_handshake_write_seq = 0; 612 } 613 614 goto end; 615 /* break; */ 616 617 default: 618 SSLerror(s, SSL_R_UNKNOWN_STATE); 619 ret = -1; 620 goto end; 621 /* break; */ 622 } 623 624 /* did we do anything */ 625 if (!S3I(s)->hs.tls12.reuse_message && !skip) { 626 if (s->internal->debug) { 627 if ((ret = BIO_flush(s->wbio)) <= 0) 628 goto end; 629 } 630 631 if ((cb != NULL) && (S3I(s)->hs.state != state)) { 632 new_state = S3I(s)->hs.state; 633 S3I(s)->hs.state = state; 634 cb(s, SSL_CB_CONNECT_LOOP, 1); 635 S3I(s)->hs.state = new_state; 636 } 637 } 638 skip = 0; 639 } 640 641 end: 642 s->internal->in_handshake--; 643 if (cb != NULL) 644 cb(s, SSL_CB_CONNECT_EXIT, ret); 645 646 return (ret); 647 } 648 649 int 650 ssl3_send_client_hello(SSL *s) 651 { 652 CBB cbb, client_hello, session_id, cookie, cipher_suites; 653 CBB compression_methods; 654 uint16_t max_version; 655 size_t sl; 656 657 memset(&cbb, 0, sizeof(cbb)); 658 659 if (S3I(s)->hs.state == SSL3_ST_CW_CLNT_HELLO_A) { 660 SSL_SESSION *sess = s->session; 661 662 if (!ssl_max_supported_version(s, &max_version)) { 663 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 664 return (-1); 665 } 666 s->client_version = s->version = max_version; 667 668 if (sess == NULL || 669 sess->ssl_version != s->version || 670 (!sess->session_id_length && !sess->tlsext_tick) || 671 sess->internal->not_resumable) { 672 if (!ssl_get_new_session(s, 0)) 673 goto err; 674 } 675 /* else use the pre-loaded session */ 676 677 /* 678 * If a DTLS ClientHello message is being resent after a 679 * HelloVerifyRequest, we must retain the original client 680 * random value. 681 */ 682 if (!SSL_is_dtls(s) || D1I(s)->send_cookie == 0) 683 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE); 684 685 if (!ssl3_handshake_msg_start(s, &cbb, &client_hello, 686 SSL3_MT_CLIENT_HELLO)) 687 goto err; 688 689 /* 690 * Version indicates the negotiated version: for example from 691 * an SSLv2/v3 compatible client hello). The client_version 692 * field is the maximum version we permit and it is also 693 * used in RSA encrypted premaster secrets. Some servers can 694 * choke if we initially report a higher version then 695 * renegotiate to a lower one in the premaster secret. This 696 * didn't happen with TLS 1.0 as most servers supported it 697 * but it can with TLS 1.1 or later if the server only supports 698 * 1.0. 699 * 700 * Possible scenario with previous logic: 701 * 1. Client hello indicates TLS 1.2 702 * 2. Server hello says TLS 1.0 703 * 3. RSA encrypted premaster secret uses 1.2. 704 * 4. Handhaked proceeds using TLS 1.0. 705 * 5. Server sends hello request to renegotiate. 706 * 6. Client hello indicates TLS v1.0 as we now 707 * know that is maximum server supports. 708 * 7. Server chokes on RSA encrypted premaster secret 709 * containing version 1.0. 710 * 711 * For interoperability it should be OK to always use the 712 * maximum version we support in client hello and then rely 713 * on the checking of version to ensure the servers isn't 714 * being inconsistent: for example initially negotiating with 715 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using 716 * client_version in client hello and not resetting it to 717 * the negotiated version. 718 */ 719 if (!CBB_add_u16(&client_hello, s->client_version)) 720 goto err; 721 722 /* Random stuff */ 723 if (!CBB_add_bytes(&client_hello, s->s3->client_random, 724 sizeof(s->s3->client_random))) 725 goto err; 726 727 /* Session ID */ 728 if (!CBB_add_u8_length_prefixed(&client_hello, &session_id)) 729 goto err; 730 if (!s->internal->new_session && 731 s->session->session_id_length > 0) { 732 sl = s->session->session_id_length; 733 if (sl > sizeof(s->session->session_id)) { 734 SSLerror(s, ERR_R_INTERNAL_ERROR); 735 goto err; 736 } 737 if (!CBB_add_bytes(&session_id, 738 s->session->session_id, sl)) 739 goto err; 740 } 741 742 /* DTLS Cookie. */ 743 if (SSL_is_dtls(s)) { 744 if (D1I(s)->cookie_len > sizeof(D1I(s)->cookie)) { 745 SSLerror(s, ERR_R_INTERNAL_ERROR); 746 goto err; 747 } 748 if (!CBB_add_u8_length_prefixed(&client_hello, &cookie)) 749 goto err; 750 if (!CBB_add_bytes(&cookie, D1I(s)->cookie, 751 D1I(s)->cookie_len)) 752 goto err; 753 } 754 755 /* Ciphers supported */ 756 if (!CBB_add_u16_length_prefixed(&client_hello, &cipher_suites)) 757 return 0; 758 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), 759 &cipher_suites)) { 760 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE); 761 goto err; 762 } 763 764 /* Add in compression methods (null) */ 765 if (!CBB_add_u8_length_prefixed(&client_hello, 766 &compression_methods)) 767 goto err; 768 if (!CBB_add_u8(&compression_methods, 0)) 769 goto err; 770 771 /* TLS extensions */ 772 if (!tlsext_client_build(s, SSL_TLSEXT_MSG_CH, &client_hello)) { 773 SSLerror(s, ERR_R_INTERNAL_ERROR); 774 goto err; 775 } 776 777 if (!ssl3_handshake_msg_finish(s, &cbb)) 778 goto err; 779 780 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_B; 781 } 782 783 /* SSL3_ST_CW_CLNT_HELLO_B */ 784 return (ssl3_handshake_write(s)); 785 786 err: 787 CBB_cleanup(&cbb); 788 789 return (-1); 790 } 791 792 int 793 ssl3_get_dtls_hello_verify(SSL *s) 794 { 795 long n; 796 int al, ok = 0; 797 size_t cookie_len; 798 uint16_t ssl_version; 799 CBS hello_verify_request, cookie; 800 801 n = ssl3_get_message(s, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 802 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, s->internal->max_cert_list, &ok); 803 if (!ok) 804 return ((int)n); 805 806 if (S3I(s)->hs.tls12.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 807 D1I(s)->send_cookie = 0; 808 S3I(s)->hs.tls12.reuse_message = 1; 809 return (1); 810 } 811 812 if (n < 0) 813 goto decode_err; 814 815 CBS_init(&hello_verify_request, s->internal->init_msg, n); 816 817 if (!CBS_get_u16(&hello_verify_request, &ssl_version)) 818 goto decode_err; 819 if (!CBS_get_u8_length_prefixed(&hello_verify_request, &cookie)) 820 goto decode_err; 821 if (CBS_len(&hello_verify_request) != 0) 822 goto decode_err; 823 824 /* 825 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should always 826 * contain DTLSv1.0 the version that is going to be negotiated. 827 * Tolerate DTLSv1.2 just in case. 828 */ 829 if (ssl_version != DTLS1_VERSION && ssl_version != DTLS1_2_VERSION) { 830 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 831 s->version = (s->version & 0xff00) | (ssl_version & 0xff); 832 al = SSL_AD_PROTOCOL_VERSION; 833 goto fatal_err; 834 } 835 836 if (!CBS_write_bytes(&cookie, D1I(s)->cookie, 837 sizeof(D1I(s)->cookie), &cookie_len)) { 838 D1I(s)->cookie_len = 0; 839 al = SSL_AD_ILLEGAL_PARAMETER; 840 goto fatal_err; 841 } 842 D1I(s)->cookie_len = cookie_len; 843 D1I(s)->send_cookie = 1; 844 845 return 1; 846 847 decode_err: 848 al = SSL_AD_DECODE_ERROR; 849 fatal_err: 850 ssl3_send_alert(s, SSL3_AL_FATAL, al); 851 return -1; 852 } 853 854 int 855 ssl3_get_server_hello(SSL *s) 856 { 857 CBS cbs, server_random, session_id; 858 uint16_t server_version, cipher_suite; 859 uint8_t compression_method; 860 const SSL_CIPHER *cipher; 861 const SSL_METHOD *method; 862 unsigned long alg_k; 863 size_t outlen; 864 int al, ok; 865 long n; 866 867 s->internal->first_packet = 1; 868 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 869 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, /* ?? */ &ok); 870 if (!ok) 871 return ((int)n); 872 s->internal->first_packet = 0; 873 874 if (n < 0) 875 goto decode_err; 876 877 CBS_init(&cbs, s->internal->init_msg, n); 878 879 if (SSL_is_dtls(s)) { 880 if (S3I(s)->hs.tls12.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 881 if (D1I(s)->send_cookie == 0) { 882 S3I(s)->hs.tls12.reuse_message = 1; 883 return (1); 884 } else { 885 /* Already sent a cookie. */ 886 al = SSL_AD_UNEXPECTED_MESSAGE; 887 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 888 goto fatal_err; 889 } 890 } 891 } 892 893 if (S3I(s)->hs.tls12.message_type != SSL3_MT_SERVER_HELLO) { 894 al = SSL_AD_UNEXPECTED_MESSAGE; 895 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 896 goto fatal_err; 897 } 898 899 if (!CBS_get_u16(&cbs, &server_version)) 900 goto decode_err; 901 902 if (!ssl_check_version_from_server(s, server_version)) { 903 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 904 s->version = (s->version & 0xff00) | (server_version & 0xff); 905 al = SSL_AD_PROTOCOL_VERSION; 906 goto fatal_err; 907 } 908 s->version = server_version; 909 910 S3I(s)->hs.negotiated_tls_version = ssl_tls_version(server_version); 911 if (S3I(s)->hs.negotiated_tls_version == 0) { 912 SSLerror(s, ERR_R_INTERNAL_ERROR); 913 goto err; 914 } 915 916 if ((method = ssl_get_method(server_version)) == NULL) { 917 SSLerror(s, ERR_R_INTERNAL_ERROR); 918 goto err; 919 } 920 s->method = method; 921 922 /* Server random. */ 923 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 924 goto decode_err; 925 if (!CBS_write_bytes(&server_random, s->s3->server_random, 926 sizeof(s->s3->server_random), NULL)) 927 goto err; 928 929 if (S3I(s)->hs.our_max_tls_version >= TLS1_2_VERSION && 930 S3I(s)->hs.negotiated_tls_version < S3I(s)->hs.our_max_tls_version) { 931 /* 932 * RFC 8446 section 4.1.3. We must not downgrade if the server 933 * random value contains the TLS 1.2 or TLS 1.1 magical value. 934 */ 935 if (!CBS_skip(&server_random, 936 CBS_len(&server_random) - sizeof(tls13_downgrade_12))) 937 goto err; 938 if (S3I(s)->hs.negotiated_tls_version == TLS1_2_VERSION && 939 CBS_mem_equal(&server_random, tls13_downgrade_12, 940 sizeof(tls13_downgrade_12))) { 941 al = SSL_AD_ILLEGAL_PARAMETER; 942 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 943 goto fatal_err; 944 } 945 if (CBS_mem_equal(&server_random, tls13_downgrade_11, 946 sizeof(tls13_downgrade_11))) { 947 al = SSL_AD_ILLEGAL_PARAMETER; 948 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 949 goto fatal_err; 950 } 951 } 952 953 /* Session ID. */ 954 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 955 goto decode_err; 956 957 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 958 al = SSL_AD_ILLEGAL_PARAMETER; 959 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 960 goto fatal_err; 961 } 962 963 /* Cipher suite. */ 964 if (!CBS_get_u16(&cbs, &cipher_suite)) 965 goto decode_err; 966 967 /* 968 * Check if we want to resume the session based on external 969 * pre-shared secret. 970 */ 971 if (s->internal->tls_session_secret_cb) { 972 SSL_CIPHER *pref_cipher = NULL; 973 s->session->master_key_length = sizeof(s->session->master_key); 974 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 975 &s->session->master_key_length, NULL, &pref_cipher, 976 s->internal->tls_session_secret_cb_arg)) { 977 s->session->cipher = pref_cipher ? pref_cipher : 978 ssl3_get_cipher_by_value(cipher_suite); 979 s->s3->flags |= SSL3_FLAGS_CCS_OK; 980 } 981 } 982 983 if (s->session->session_id_length != 0 && 984 CBS_mem_equal(&session_id, s->session->session_id, 985 s->session->session_id_length)) { 986 if (s->sid_ctx_length != s->session->sid_ctx_length || 987 timingsafe_memcmp(s->session->sid_ctx, 988 s->sid_ctx, s->sid_ctx_length) != 0) { 989 /* actually a client application bug */ 990 al = SSL_AD_ILLEGAL_PARAMETER; 991 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 992 goto fatal_err; 993 } 994 s->s3->flags |= SSL3_FLAGS_CCS_OK; 995 s->internal->hit = 1; 996 } else { 997 /* a miss or crap from the other end */ 998 999 /* If we were trying for session-id reuse, make a new 1000 * SSL_SESSION so we don't stuff up other people */ 1001 s->internal->hit = 0; 1002 if (s->session->session_id_length > 0) { 1003 if (!ssl_get_new_session(s, 0)) { 1004 al = SSL_AD_INTERNAL_ERROR; 1005 goto fatal_err; 1006 } 1007 } 1008 1009 /* 1010 * XXX - improve the handling for the case where there is a 1011 * zero length session identifier. 1012 */ 1013 if (!CBS_write_bytes(&session_id, s->session->session_id, 1014 sizeof(s->session->session_id), &outlen)) 1015 goto err; 1016 s->session->session_id_length = outlen; 1017 1018 s->session->ssl_version = s->version; 1019 } 1020 1021 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 1022 al = SSL_AD_ILLEGAL_PARAMETER; 1023 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 1024 goto fatal_err; 1025 } 1026 1027 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 1028 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 1029 S3I(s)->hs.negotiated_tls_version < TLS1_2_VERSION) { 1030 al = SSL_AD_ILLEGAL_PARAMETER; 1031 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1032 goto fatal_err; 1033 } 1034 1035 if (!ssl_cipher_in_list(SSL_get_ciphers(s), cipher)) { 1036 /* we did not say we would use this cipher */ 1037 al = SSL_AD_ILLEGAL_PARAMETER; 1038 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1039 goto fatal_err; 1040 } 1041 1042 /* 1043 * Depending on the session caching (internal/external), the cipher 1044 * and/or cipher_id values may not be set. Make sure that 1045 * cipher_id is set and use it for comparison. 1046 */ 1047 if (s->session->cipher) 1048 s->session->cipher_id = s->session->cipher->id; 1049 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 1050 al = SSL_AD_ILLEGAL_PARAMETER; 1051 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1052 goto fatal_err; 1053 } 1054 S3I(s)->hs.cipher = cipher; 1055 1056 if (!tls1_transcript_hash_init(s)) 1057 goto err; 1058 1059 /* 1060 * Don't digest cached records if no sigalgs: we may need them for 1061 * client authentication. 1062 */ 1063 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 1064 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST))) 1065 tls1_transcript_free(s); 1066 1067 if (!CBS_get_u8(&cbs, &compression_method)) 1068 goto decode_err; 1069 1070 if (compression_method != 0) { 1071 al = SSL_AD_ILLEGAL_PARAMETER; 1072 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1073 goto fatal_err; 1074 } 1075 1076 if (!tlsext_client_parse(s, SSL_TLSEXT_MSG_SH, &cbs, &al)) { 1077 SSLerror(s, SSL_R_PARSE_TLSEXT); 1078 goto fatal_err; 1079 } 1080 1081 /* 1082 * Determine if we need to see RI. Strictly speaking if we want to 1083 * avoid an attack we should *always* see RI even on initial server 1084 * hello because the client doesn't see any renegotiation during an 1085 * attack. However this would mean we could not connect to any server 1086 * which doesn't support RI so for the immediate future tolerate RI 1087 * absence on initial connect only. 1088 */ 1089 if (!S3I(s)->renegotiate_seen && 1090 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1091 al = SSL_AD_HANDSHAKE_FAILURE; 1092 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1093 goto fatal_err; 1094 } 1095 1096 if (ssl_check_serverhello_tlsext(s) <= 0) { 1097 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1098 goto err; 1099 } 1100 1101 return (1); 1102 1103 decode_err: 1104 /* wrong packet length */ 1105 al = SSL_AD_DECODE_ERROR; 1106 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1107 fatal_err: 1108 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1109 err: 1110 return (-1); 1111 } 1112 1113 int 1114 ssl3_get_server_certificate(SSL *s) 1115 { 1116 int al, i, ok, ret = -1; 1117 long n; 1118 CBS cbs, cert_list; 1119 X509 *x = NULL; 1120 const unsigned char *q; 1121 STACK_OF(X509) *sk = NULL; 1122 SESS_CERT *sc; 1123 EVP_PKEY *pkey = NULL; 1124 1125 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1126 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 1127 if (!ok) 1128 return ((int)n); 1129 1130 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1131 S3I(s)->hs.tls12.reuse_message = 1; 1132 return (1); 1133 } 1134 1135 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE) { 1136 al = SSL_AD_UNEXPECTED_MESSAGE; 1137 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1138 goto fatal_err; 1139 } 1140 1141 1142 if ((sk = sk_X509_new_null()) == NULL) { 1143 SSLerror(s, ERR_R_MALLOC_FAILURE); 1144 goto err; 1145 } 1146 1147 if (n < 0) 1148 goto decode_err; 1149 1150 CBS_init(&cbs, s->internal->init_msg, n); 1151 if (CBS_len(&cbs) < 3) 1152 goto decode_err; 1153 1154 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1155 CBS_len(&cbs) != 0) { 1156 al = SSL_AD_DECODE_ERROR; 1157 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1158 goto fatal_err; 1159 } 1160 1161 while (CBS_len(&cert_list) > 0) { 1162 CBS cert; 1163 1164 if (CBS_len(&cert_list) < 3) 1165 goto decode_err; 1166 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1167 al = SSL_AD_DECODE_ERROR; 1168 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1169 goto fatal_err; 1170 } 1171 1172 q = CBS_data(&cert); 1173 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1174 if (x == NULL) { 1175 al = SSL_AD_BAD_CERTIFICATE; 1176 SSLerror(s, ERR_R_ASN1_LIB); 1177 goto fatal_err; 1178 } 1179 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1180 al = SSL_AD_DECODE_ERROR; 1181 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1182 goto fatal_err; 1183 } 1184 if (!sk_X509_push(sk, x)) { 1185 SSLerror(s, ERR_R_MALLOC_FAILURE); 1186 goto err; 1187 } 1188 x = NULL; 1189 } 1190 1191 i = ssl_verify_cert_chain(s, sk); 1192 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1193 al = ssl_verify_alarm_type(s->verify_result); 1194 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1195 goto fatal_err; 1196 1197 } 1198 ERR_clear_error(); /* but we keep s->verify_result */ 1199 1200 sc = ssl_sess_cert_new(); 1201 if (sc == NULL) 1202 goto err; 1203 ssl_sess_cert_free(SSI(s)->sess_cert); 1204 SSI(s)->sess_cert = sc; 1205 1206 sc->cert_chain = sk; 1207 /* 1208 * Inconsistency alert: cert_chain does include the peer's 1209 * certificate, which we don't include in s3_srvr.c 1210 */ 1211 x = sk_X509_value(sk, 0); 1212 sk = NULL; 1213 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1214 1215 pkey = X509_get_pubkey(x); 1216 1217 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1218 x = NULL; 1219 al = SSL3_AL_FATAL; 1220 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1221 goto fatal_err; 1222 } 1223 1224 i = ssl_cert_type(x, pkey); 1225 if (i < 0) { 1226 x = NULL; 1227 al = SSL3_AL_FATAL; 1228 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1229 goto fatal_err; 1230 } 1231 1232 sc->peer_cert_type = i; 1233 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1234 /* 1235 * Why would the following ever happen? 1236 * We just created sc a couple of lines ago. 1237 */ 1238 X509_free(sc->peer_pkeys[i].x509); 1239 sc->peer_pkeys[i].x509 = x; 1240 sc->peer_key = &(sc->peer_pkeys[i]); 1241 1242 X509_free(s->session->peer); 1243 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1244 s->session->peer = x; 1245 s->session->verify_result = s->verify_result; 1246 1247 x = NULL; 1248 ret = 1; 1249 1250 if (0) { 1251 decode_err: 1252 /* wrong packet length */ 1253 al = SSL_AD_DECODE_ERROR; 1254 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1255 fatal_err: 1256 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1257 } 1258 err: 1259 EVP_PKEY_free(pkey); 1260 X509_free(x); 1261 sk_X509_pop_free(sk, X509_free); 1262 1263 return (ret); 1264 } 1265 1266 static int 1267 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1268 { 1269 CBS dhp, dhg, dhpk; 1270 BN_CTX *bn_ctx = NULL; 1271 SESS_CERT *sc = NULL; 1272 DH *dh = NULL; 1273 long alg_a; 1274 int al; 1275 1276 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1277 sc = SSI(s)->sess_cert; 1278 1279 if ((dh = DH_new()) == NULL) { 1280 SSLerror(s, ERR_R_DH_LIB); 1281 goto err; 1282 } 1283 1284 if (!CBS_get_u16_length_prefixed(cbs, &dhp)) 1285 goto decode_err; 1286 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1287 SSLerror(s, ERR_R_BN_LIB); 1288 goto err; 1289 } 1290 1291 if (!CBS_get_u16_length_prefixed(cbs, &dhg)) 1292 goto decode_err; 1293 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1294 SSLerror(s, ERR_R_BN_LIB); 1295 goto err; 1296 } 1297 1298 if (!CBS_get_u16_length_prefixed(cbs, &dhpk)) 1299 goto decode_err; 1300 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1301 NULL)) == NULL) { 1302 SSLerror(s, ERR_R_BN_LIB); 1303 goto err; 1304 } 1305 1306 /* 1307 * Check the strength of the DH key just constructed. 1308 * Discard keys weaker than 1024 bits. 1309 */ 1310 if (DH_size(dh) < 1024 / 8) { 1311 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1312 goto err; 1313 } 1314 1315 if (alg_a & SSL_aRSA) 1316 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1317 else 1318 /* XXX - Anonymous DH, so no certificate or pkey. */ 1319 *pkey = NULL; 1320 1321 sc->peer_dh_tmp = dh; 1322 1323 return (1); 1324 1325 decode_err: 1326 al = SSL_AD_DECODE_ERROR; 1327 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1328 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1329 1330 err: 1331 DH_free(dh); 1332 BN_CTX_free(bn_ctx); 1333 1334 return (-1); 1335 } 1336 1337 static int 1338 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1339 { 1340 EC_KEY *ecdh = NULL; 1341 int ret = -1; 1342 1343 /* Extract the server's ephemeral ECDH public key. */ 1344 if ((ecdh = EC_KEY_new()) == NULL) { 1345 SSLerror(s, ERR_R_MALLOC_FAILURE); 1346 goto err; 1347 } 1348 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh, nid, public)) { 1349 SSLerror(s, SSL_R_BAD_ECPOINT); 1350 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1351 goto err; 1352 } 1353 1354 sc->peer_nid = nid; 1355 sc->peer_ecdh_tmp = ecdh; 1356 ecdh = NULL; 1357 1358 ret = 1; 1359 1360 err: 1361 EC_KEY_free(ecdh); 1362 1363 return (ret); 1364 } 1365 1366 static int 1367 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1368 { 1369 size_t outlen; 1370 1371 if (nid != NID_X25519) { 1372 SSLerror(s, ERR_R_INTERNAL_ERROR); 1373 goto err; 1374 } 1375 1376 if (CBS_len(public) != X25519_KEY_LENGTH) { 1377 SSLerror(s, SSL_R_BAD_ECPOINT); 1378 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1379 goto err; 1380 } 1381 1382 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1383 SSLerror(s, ERR_R_MALLOC_FAILURE); 1384 goto err; 1385 } 1386 1387 return (1); 1388 1389 err: 1390 return (-1); 1391 } 1392 1393 static int 1394 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1395 { 1396 CBS public; 1397 uint8_t curve_type; 1398 uint16_t curve_id; 1399 SESS_CERT *sc; 1400 long alg_a; 1401 int nid; 1402 int al; 1403 1404 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1405 sc = SSI(s)->sess_cert; 1406 1407 /* Only named curves are supported. */ 1408 if (!CBS_get_u8(cbs, &curve_type) || 1409 curve_type != NAMED_CURVE_TYPE || 1410 !CBS_get_u16(cbs, &curve_id)) { 1411 al = SSL_AD_DECODE_ERROR; 1412 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1413 goto fatal_err; 1414 } 1415 1416 /* 1417 * Check that the curve is one of our preferences - if it is not, 1418 * the server has sent us an invalid curve. 1419 */ 1420 if (tls1_check_curve(s, curve_id) != 1) { 1421 al = SSL_AD_DECODE_ERROR; 1422 SSLerror(s, SSL_R_WRONG_CURVE); 1423 goto fatal_err; 1424 } 1425 1426 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1427 al = SSL_AD_INTERNAL_ERROR; 1428 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1429 goto fatal_err; 1430 } 1431 1432 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1433 goto decode_err; 1434 1435 if (nid == NID_X25519) { 1436 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1437 goto err; 1438 } else { 1439 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1440 goto err; 1441 } 1442 1443 /* 1444 * The ECC/TLS specification does not mention the use of DSA to sign 1445 * ECParameters in the server key exchange message. We do support RSA 1446 * and ECDSA. 1447 */ 1448 if (alg_a & SSL_aRSA) 1449 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1450 else if (alg_a & SSL_aECDSA) 1451 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1452 else 1453 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1454 *pkey = NULL; 1455 1456 return (1); 1457 1458 decode_err: 1459 al = SSL_AD_DECODE_ERROR; 1460 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1461 1462 fatal_err: 1463 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1464 1465 err: 1466 return (-1); 1467 } 1468 1469 int 1470 ssl3_get_server_key_exchange(SSL *s) 1471 { 1472 CBS cbs, signature; 1473 const EVP_MD *md = NULL; 1474 EVP_PKEY *pkey = NULL; 1475 EVP_MD_CTX md_ctx; 1476 const unsigned char *param; 1477 long n, alg_k, alg_a; 1478 int al, ok; 1479 size_t param_len; 1480 1481 EVP_MD_CTX_init(&md_ctx); 1482 1483 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 1484 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1485 1486 /* 1487 * Use same message size as in ssl3_get_certificate_request() 1488 * as ServerKeyExchange message may be skipped. 1489 */ 1490 n = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1491 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1492 if (!ok) 1493 return ((int)n); 1494 1495 if (n < 0) 1496 goto err; 1497 1498 CBS_init(&cbs, s->internal->init_msg, n); 1499 1500 if (S3I(s)->hs.tls12.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1501 /* 1502 * Do not skip server key exchange if this cipher suite uses 1503 * ephemeral keys. 1504 */ 1505 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1506 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1507 al = SSL_AD_UNEXPECTED_MESSAGE; 1508 goto fatal_err; 1509 } 1510 1511 S3I(s)->hs.tls12.reuse_message = 1; 1512 EVP_MD_CTX_cleanup(&md_ctx); 1513 return (1); 1514 } 1515 1516 if (SSI(s)->sess_cert != NULL) { 1517 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1518 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1519 1520 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1521 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1522 1523 free(SSI(s)->sess_cert->peer_x25519_tmp); 1524 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1525 } else { 1526 SSI(s)->sess_cert = ssl_sess_cert_new(); 1527 if (SSI(s)->sess_cert == NULL) 1528 goto err; 1529 } 1530 1531 param = CBS_data(&cbs); 1532 param_len = CBS_len(&cbs); 1533 1534 if (alg_k & SSL_kDHE) { 1535 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1) 1536 goto err; 1537 } else if (alg_k & SSL_kECDHE) { 1538 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1) 1539 goto err; 1540 } else if (alg_k != 0) { 1541 al = SSL_AD_UNEXPECTED_MESSAGE; 1542 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1543 goto fatal_err; 1544 } 1545 1546 param_len -= CBS_len(&cbs); 1547 1548 /* if it was signed, check the signature */ 1549 if (pkey != NULL) { 1550 EVP_PKEY_CTX *pctx; 1551 const struct ssl_sigalg *sigalg; 1552 1553 if (SSL_USE_SIGALGS(s)) { 1554 uint16_t sigalg_value; 1555 1556 if (!CBS_get_u16(&cbs, &sigalg_value)) 1557 goto decode_err; 1558 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, 1559 tls12_sigalgs_len)) == NULL) { 1560 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1561 al = SSL_AD_DECODE_ERROR; 1562 goto fatal_err; 1563 } 1564 if ((md = sigalg->md()) == NULL) { 1565 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1566 al = SSL_AD_DECODE_ERROR; 1567 goto fatal_err; 1568 } 1569 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) { 1570 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 1571 al = SSL_AD_DECODE_ERROR; 1572 goto fatal_err; 1573 } 1574 } else if (pkey->type == EVP_PKEY_RSA) { 1575 sigalg = ssl_sigalg_lookup(SIGALG_RSA_PKCS1_MD5_SHA1); 1576 } else if (pkey->type == EVP_PKEY_EC) { 1577 sigalg = ssl_sigalg_lookup(SIGALG_ECDSA_SHA1); 1578 } else { 1579 SSLerror(s, SSL_R_UNKNOWN_PKEY_TYPE); 1580 al = SSL_AD_DECODE_ERROR; 1581 goto fatal_err; 1582 } 1583 md = sigalg->md(); 1584 1585 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1586 goto decode_err; 1587 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1588 al = SSL_AD_DECODE_ERROR; 1589 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1590 goto fatal_err; 1591 } 1592 1593 if (!EVP_DigestVerifyInit(&md_ctx, &pctx, md, NULL, pkey)) 1594 goto err; 1595 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->client_random, 1596 SSL3_RANDOM_SIZE)) 1597 goto err; 1598 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1599 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1600 RSA_PKCS1_PSS_PADDING) || 1601 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1602 goto err; 1603 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->server_random, 1604 SSL3_RANDOM_SIZE)) 1605 goto err; 1606 if (!EVP_DigestVerifyUpdate(&md_ctx, param, param_len)) 1607 goto err; 1608 if (EVP_DigestVerifyFinal(&md_ctx, CBS_data(&signature), 1609 CBS_len(&signature)) <= 0) { 1610 al = SSL_AD_DECRYPT_ERROR; 1611 SSLerror(s, SSL_R_BAD_SIGNATURE); 1612 goto fatal_err; 1613 } 1614 } else { 1615 /* aNULL does not need public keys. */ 1616 if (!(alg_a & SSL_aNULL)) { 1617 SSLerror(s, ERR_R_INTERNAL_ERROR); 1618 goto err; 1619 } 1620 } 1621 1622 if (CBS_len(&cbs) != 0) { 1623 al = SSL_AD_DECODE_ERROR; 1624 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1625 goto fatal_err; 1626 } 1627 1628 EVP_PKEY_free(pkey); 1629 EVP_MD_CTX_cleanup(&md_ctx); 1630 1631 return (1); 1632 1633 decode_err: 1634 al = SSL_AD_DECODE_ERROR; 1635 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1636 1637 fatal_err: 1638 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1639 1640 err: 1641 EVP_PKEY_free(pkey); 1642 EVP_MD_CTX_cleanup(&md_ctx); 1643 1644 return (-1); 1645 } 1646 1647 int 1648 ssl3_get_certificate_request(SSL *s) 1649 { 1650 int ok, ret = 0; 1651 long n; 1652 CBS cert_request, cert_types, rdn_list; 1653 X509_NAME *xn = NULL; 1654 const unsigned char *q; 1655 STACK_OF(X509_NAME) *ca_sk = NULL; 1656 1657 n = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1658 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1659 if (!ok) 1660 return ((int)n); 1661 1662 S3I(s)->hs.tls12.cert_request = 0; 1663 1664 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_DONE) { 1665 S3I(s)->hs.tls12.reuse_message = 1; 1666 /* 1667 * If we get here we don't need any cached handshake records 1668 * as we wont be doing client auth. 1669 */ 1670 tls1_transcript_free(s); 1671 return (1); 1672 } 1673 1674 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1675 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1676 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1677 goto err; 1678 } 1679 1680 /* TLS does not like anon-DH with client cert */ 1681 if (S3I(s)->hs.cipher->algorithm_auth & SSL_aNULL) { 1682 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1683 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1684 goto err; 1685 } 1686 1687 if (n < 0) 1688 goto decode_err; 1689 CBS_init(&cert_request, s->internal->init_msg, n); 1690 1691 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1692 SSLerror(s, ERR_R_MALLOC_FAILURE); 1693 goto err; 1694 } 1695 1696 if (!CBS_get_u8_length_prefixed(&cert_request, &cert_types)) 1697 goto decode_err; 1698 1699 if (SSL_USE_SIGALGS(s)) { 1700 CBS sigalgs; 1701 1702 if (CBS_len(&cert_request) < 2) { 1703 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1704 goto err; 1705 } 1706 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1707 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1708 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1709 goto err; 1710 } 1711 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1712 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1713 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1714 goto err; 1715 } 1716 if (!CBS_stow(&sigalgs, &S3I(s)->hs.sigalgs, 1717 &S3I(s)->hs.sigalgs_len)) 1718 goto err; 1719 } 1720 1721 /* get the CA RDNs */ 1722 if (CBS_len(&cert_request) < 2) { 1723 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1724 goto err; 1725 } 1726 1727 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1728 CBS_len(&cert_request) != 0) { 1729 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1730 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1731 goto err; 1732 } 1733 1734 while (CBS_len(&rdn_list) > 0) { 1735 CBS rdn; 1736 1737 if (CBS_len(&rdn_list) < 2) { 1738 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1739 goto err; 1740 } 1741 1742 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1743 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1744 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1745 goto err; 1746 } 1747 1748 q = CBS_data(&rdn); 1749 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1750 ssl3_send_alert(s, SSL3_AL_FATAL, 1751 SSL_AD_DECODE_ERROR); 1752 SSLerror(s, ERR_R_ASN1_LIB); 1753 goto err; 1754 } 1755 1756 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1757 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1758 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1759 goto err; 1760 } 1761 if (!sk_X509_NAME_push(ca_sk, xn)) { 1762 SSLerror(s, ERR_R_MALLOC_FAILURE); 1763 goto err; 1764 } 1765 xn = NULL; /* avoid free in err block */ 1766 } 1767 1768 /* we should setup a certificate to return.... */ 1769 S3I(s)->hs.tls12.cert_request = 1; 1770 sk_X509_NAME_pop_free(S3I(s)->hs.tls12.ca_names, X509_NAME_free); 1771 S3I(s)->hs.tls12.ca_names = ca_sk; 1772 ca_sk = NULL; 1773 1774 ret = 1; 1775 if (0) { 1776 decode_err: 1777 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1778 } 1779 err: 1780 X509_NAME_free(xn); 1781 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1782 return (ret); 1783 } 1784 1785 static int 1786 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1787 { 1788 return (X509_NAME_cmp(*a, *b)); 1789 } 1790 1791 int 1792 ssl3_get_new_session_ticket(SSL *s) 1793 { 1794 int ok, al, ret = 0; 1795 uint32_t lifetime_hint; 1796 long n; 1797 CBS cbs, session_ticket; 1798 1799 n = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1800 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1801 if (!ok) 1802 return ((int)n); 1803 1804 if (S3I(s)->hs.tls12.message_type == SSL3_MT_FINISHED) { 1805 S3I(s)->hs.tls12.reuse_message = 1; 1806 return (1); 1807 } 1808 if (S3I(s)->hs.tls12.message_type != SSL3_MT_NEWSESSION_TICKET) { 1809 al = SSL_AD_UNEXPECTED_MESSAGE; 1810 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1811 goto fatal_err; 1812 } 1813 1814 if (n < 0) { 1815 al = SSL_AD_DECODE_ERROR; 1816 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1817 goto fatal_err; 1818 } 1819 1820 CBS_init(&cbs, s->internal->init_msg, n); 1821 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1822 #if UINT32_MAX > LONG_MAX 1823 lifetime_hint > LONG_MAX || 1824 #endif 1825 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1826 CBS_len(&cbs) != 0) { 1827 al = SSL_AD_DECODE_ERROR; 1828 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1829 goto fatal_err; 1830 } 1831 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1832 1833 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1834 &s->session->tlsext_ticklen)) { 1835 SSLerror(s, ERR_R_MALLOC_FAILURE); 1836 goto err; 1837 } 1838 1839 /* 1840 * There are two ways to detect a resumed ticket sesion. 1841 * One is to set an appropriate session ID and then the server 1842 * must return a match in ServerHello. This allows the normal 1843 * client session ID matching to work and we know much 1844 * earlier that the ticket has been accepted. 1845 * 1846 * The other way is to set zero length session ID when the 1847 * ticket is presented and rely on the handshake to determine 1848 * session resumption. 1849 * 1850 * We choose the former approach because this fits in with 1851 * assumptions elsewhere in OpenSSL. The session ID is set 1852 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1853 * ticket. 1854 */ 1855 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1856 s->session->session_id, &s->session->session_id_length, 1857 EVP_sha256(), NULL); 1858 ret = 1; 1859 return (ret); 1860 fatal_err: 1861 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1862 err: 1863 return (-1); 1864 } 1865 1866 int 1867 ssl3_get_cert_status(SSL *s) 1868 { 1869 CBS cert_status, response; 1870 int ok, al; 1871 long n; 1872 uint8_t status_type; 1873 1874 n = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1875 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 1876 16384, &ok); 1877 if (!ok) 1878 return ((int)n); 1879 1880 if (n < 0) { 1881 /* need at least status type + length */ 1882 al = SSL_AD_DECODE_ERROR; 1883 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1884 goto fatal_err; 1885 } 1886 1887 CBS_init(&cert_status, s->internal->init_msg, n); 1888 if (!CBS_get_u8(&cert_status, &status_type) || 1889 CBS_len(&cert_status) < 3) { 1890 /* need at least status type + length */ 1891 al = SSL_AD_DECODE_ERROR; 1892 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1893 goto fatal_err; 1894 } 1895 1896 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1897 al = SSL_AD_DECODE_ERROR; 1898 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1899 goto fatal_err; 1900 } 1901 1902 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1903 CBS_len(&cert_status) != 0) { 1904 al = SSL_AD_DECODE_ERROR; 1905 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1906 goto fatal_err; 1907 } 1908 1909 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1910 &s->internal->tlsext_ocsp_resp_len)) { 1911 al = SSL_AD_INTERNAL_ERROR; 1912 SSLerror(s, ERR_R_MALLOC_FAILURE); 1913 goto fatal_err; 1914 } 1915 1916 if (s->ctx->internal->tlsext_status_cb) { 1917 int ret; 1918 ret = s->ctx->internal->tlsext_status_cb(s, 1919 s->ctx->internal->tlsext_status_arg); 1920 if (ret == 0) { 1921 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1922 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1923 goto fatal_err; 1924 } 1925 if (ret < 0) { 1926 al = SSL_AD_INTERNAL_ERROR; 1927 SSLerror(s, ERR_R_MALLOC_FAILURE); 1928 goto fatal_err; 1929 } 1930 } 1931 return (1); 1932 fatal_err: 1933 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1934 return (-1); 1935 } 1936 1937 int 1938 ssl3_get_server_done(SSL *s) 1939 { 1940 int ok, ret = 0; 1941 long n; 1942 1943 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1944 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1945 30, /* should be very small, like 0 :-) */ &ok); 1946 if (!ok) 1947 return ((int)n); 1948 1949 if (n > 0) { 1950 /* should contain no data */ 1951 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1952 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1953 return (-1); 1954 } 1955 ret = 1; 1956 return (ret); 1957 } 1958 1959 static int 1960 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1961 { 1962 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1963 unsigned char *enc_pms = NULL; 1964 EVP_PKEY *pkey = NULL; 1965 int ret = -1; 1966 int enc_len; 1967 CBB epms; 1968 1969 /* 1970 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1971 */ 1972 1973 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA].x509); 1974 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1975 pkey->pkey.rsa == NULL) { 1976 SSLerror(s, ERR_R_INTERNAL_ERROR); 1977 goto err; 1978 } 1979 1980 /* XXX - our max protocol version. */ 1981 pms[0] = s->client_version >> 8; 1982 pms[1] = s->client_version & 0xff; 1983 arc4random_buf(&pms[2], sizeof(pms) - 2); 1984 1985 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1986 SSLerror(s, ERR_R_MALLOC_FAILURE); 1987 goto err; 1988 } 1989 1990 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 1991 RSA_PKCS1_PADDING); 1992 if (enc_len <= 0) { 1993 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1994 goto err; 1995 } 1996 1997 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1998 goto err; 1999 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 2000 goto err; 2001 if (!CBB_flush(cbb)) 2002 goto err; 2003 2004 s->session->master_key_length = 2005 tls1_generate_master_secret(s, 2006 s->session->master_key, pms, sizeof(pms)); 2007 2008 ret = 1; 2009 2010 err: 2011 explicit_bzero(pms, sizeof(pms)); 2012 EVP_PKEY_free(pkey); 2013 free(enc_pms); 2014 2015 return (ret); 2016 } 2017 2018 static int 2019 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2020 { 2021 DH *dh_srvr = NULL, *dh_clnt = NULL; 2022 unsigned char *key = NULL; 2023 int key_size = 0, key_len; 2024 unsigned char *data; 2025 int ret = -1; 2026 CBB dh_Yc; 2027 2028 /* Ensure that we have an ephemeral key for DHE. */ 2029 if (sess_cert->peer_dh_tmp == NULL) { 2030 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2031 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 2032 goto err; 2033 } 2034 dh_srvr = sess_cert->peer_dh_tmp; 2035 2036 /* Generate a new random key. */ 2037 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2038 SSLerror(s, ERR_R_DH_LIB); 2039 goto err; 2040 } 2041 if (!DH_generate_key(dh_clnt)) { 2042 SSLerror(s, ERR_R_DH_LIB); 2043 goto err; 2044 } 2045 if ((key_size = DH_size(dh_clnt)) <= 0) { 2046 SSLerror(s, ERR_R_DH_LIB); 2047 goto err; 2048 } 2049 if ((key = malloc(key_size)) == NULL) { 2050 SSLerror(s, ERR_R_MALLOC_FAILURE); 2051 goto err; 2052 } 2053 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) { 2054 SSLerror(s, ERR_R_DH_LIB); 2055 goto err; 2056 } 2057 2058 /* Generate master key from the result. */ 2059 s->session->master_key_length = 2060 tls1_generate_master_secret(s, 2061 s->session->master_key, key, key_len); 2062 2063 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2064 goto err; 2065 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2066 goto err; 2067 BN_bn2bin(dh_clnt->pub_key, data); 2068 if (!CBB_flush(cbb)) 2069 goto err; 2070 2071 ret = 1; 2072 2073 err: 2074 DH_free(dh_clnt); 2075 freezero(key, key_size); 2076 2077 return (ret); 2078 } 2079 2080 static int 2081 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2082 { 2083 EC_KEY *ecdh = NULL; 2084 uint8_t *key = NULL; 2085 size_t key_len = 0; 2086 int ret = -1; 2087 CBB ecpoint; 2088 2089 if ((ecdh = EC_KEY_new()) == NULL) { 2090 SSLerror(s, ERR_R_MALLOC_FAILURE); 2091 goto err; 2092 } 2093 2094 if (!ssl_kex_generate_ecdhe_ecp(ecdh, sc->peer_nid)) 2095 goto err; 2096 2097 /* Encode our public key. */ 2098 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2099 goto err; 2100 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 2101 goto err; 2102 if (!CBB_flush(cbb)) 2103 goto err; 2104 2105 if (!ssl_kex_derive_ecdhe_ecp(ecdh, sc->peer_ecdh_tmp, &key, &key_len)) 2106 goto err; 2107 s->session->master_key_length = tls1_generate_master_secret(s, 2108 s->session->master_key, key, key_len); 2109 2110 ret = 1; 2111 2112 err: 2113 freezero(key, key_len); 2114 EC_KEY_free(ecdh); 2115 2116 return (ret); 2117 } 2118 2119 static int 2120 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2121 { 2122 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2123 int ret = -1; 2124 CBB ecpoint; 2125 2126 /* Generate X25519 key pair and derive shared key. */ 2127 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2128 goto err; 2129 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2130 goto err; 2131 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2132 goto err; 2133 X25519_keypair(public_key, private_key); 2134 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2135 goto err; 2136 2137 /* Serialize the public key. */ 2138 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2139 goto err; 2140 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2141 goto err; 2142 if (!CBB_flush(cbb)) 2143 goto err; 2144 2145 /* Generate master key from the result. */ 2146 s->session->master_key_length = 2147 tls1_generate_master_secret(s, 2148 s->session->master_key, shared_key, X25519_KEY_LENGTH); 2149 2150 ret = 1; 2151 2152 err: 2153 free(public_key); 2154 freezero(private_key, X25519_KEY_LENGTH); 2155 freezero(shared_key, X25519_KEY_LENGTH); 2156 2157 return (ret); 2158 } 2159 2160 static int 2161 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2162 { 2163 if (sc->peer_x25519_tmp != NULL) { 2164 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2165 goto err; 2166 } else if (sc->peer_ecdh_tmp != NULL) { 2167 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2168 goto err; 2169 } else { 2170 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2171 SSLerror(s, ERR_R_INTERNAL_ERROR); 2172 goto err; 2173 } 2174 2175 return (1); 2176 2177 err: 2178 return (-1); 2179 } 2180 2181 static int 2182 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2183 { 2184 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2185 EVP_PKEY *pub_key = NULL; 2186 EVP_PKEY_CTX *pkey_ctx; 2187 X509 *peer_cert; 2188 size_t msglen; 2189 unsigned int md_len; 2190 EVP_MD_CTX *ukm_hash; 2191 int ret = -1; 2192 int nid; 2193 CBB gostblob; 2194 2195 /* Get server sertificate PKEY and create ctx from it */ 2196 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2197 if (peer_cert == NULL) { 2198 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2199 goto err; 2200 } 2201 2202 pub_key = X509_get_pubkey(peer_cert); 2203 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2204 2205 /* 2206 * If we have send a certificate, and certificate key parameters match 2207 * those of server certificate, use certificate key for key exchange. 2208 * Otherwise, generate ephemeral key pair. 2209 */ 2210 EVP_PKEY_encrypt_init(pkey_ctx); 2211 2212 /* Generate session key. */ 2213 arc4random_buf(premaster_secret, 32); 2214 2215 /* 2216 * If we have client certificate, use its secret as peer key. 2217 */ 2218 if (S3I(s)->hs.tls12.cert_request && s->cert->key->privatekey) { 2219 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2220 s->cert->key->privatekey) <=0) { 2221 /* 2222 * If there was an error - just ignore it. 2223 * Ephemeral key would be used. 2224 */ 2225 ERR_clear_error(); 2226 } 2227 } 2228 2229 /* 2230 * Compute shared IV and store it in algorithm-specific context data. 2231 */ 2232 ukm_hash = EVP_MD_CTX_new(); 2233 if (ukm_hash == NULL) { 2234 SSLerror(s, ERR_R_MALLOC_FAILURE); 2235 goto err; 2236 } 2237 2238 /* XXX check handshake hash instead. */ 2239 if (S3I(s)->hs.cipher->algorithm2 & SSL_HANDSHAKE_MAC_GOST94) 2240 nid = NID_id_GostR3411_94; 2241 else 2242 nid = NID_id_tc26_gost3411_2012_256; 2243 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2244 goto err; 2245 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2246 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2247 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2248 EVP_MD_CTX_free(ukm_hash); 2249 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2250 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2251 SSLerror(s, SSL_R_LIBRARY_BUG); 2252 goto err; 2253 } 2254 2255 /* 2256 * Make GOST keytransport blob message, encapsulate it into sequence. 2257 */ 2258 msglen = 255; 2259 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2260 32) < 0) { 2261 SSLerror(s, SSL_R_LIBRARY_BUG); 2262 goto err; 2263 } 2264 2265 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2266 goto err; 2267 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2268 goto err; 2269 if (!CBB_flush(cbb)) 2270 goto err; 2271 2272 /* Check if pubkey from client certificate was used. */ 2273 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2274 NULL) > 0) { 2275 /* Set flag "skip certificate verify". */ 2276 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2277 } 2278 EVP_PKEY_CTX_free(pkey_ctx); 2279 s->session->master_key_length = 2280 tls1_generate_master_secret(s, 2281 s->session->master_key, premaster_secret, 32); 2282 2283 ret = 1; 2284 2285 err: 2286 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2287 EVP_PKEY_free(pub_key); 2288 2289 return (ret); 2290 } 2291 2292 int 2293 ssl3_send_client_key_exchange(SSL *s) 2294 { 2295 SESS_CERT *sess_cert; 2296 unsigned long alg_k; 2297 CBB cbb, kex; 2298 2299 memset(&cbb, 0, sizeof(cbb)); 2300 2301 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2302 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2303 2304 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2305 ssl3_send_alert(s, SSL3_AL_FATAL, 2306 SSL_AD_UNEXPECTED_MESSAGE); 2307 SSLerror(s, ERR_R_INTERNAL_ERROR); 2308 goto err; 2309 } 2310 2311 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2312 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2313 goto err; 2314 2315 if (alg_k & SSL_kRSA) { 2316 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2317 goto err; 2318 } else if (alg_k & SSL_kDHE) { 2319 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2320 goto err; 2321 } else if (alg_k & SSL_kECDHE) { 2322 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2323 goto err; 2324 } else if (alg_k & SSL_kGOST) { 2325 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2326 goto err; 2327 } else { 2328 ssl3_send_alert(s, SSL3_AL_FATAL, 2329 SSL_AD_HANDSHAKE_FAILURE); 2330 SSLerror(s, ERR_R_INTERNAL_ERROR); 2331 goto err; 2332 } 2333 2334 if (!ssl3_handshake_msg_finish(s, &cbb)) 2335 goto err; 2336 2337 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2338 } 2339 2340 /* SSL3_ST_CW_KEY_EXCH_B */ 2341 return (ssl3_handshake_write(s)); 2342 2343 err: 2344 CBB_cleanup(&cbb); 2345 2346 return (-1); 2347 } 2348 2349 static int 2350 ssl3_send_client_verify_sigalgs(SSL *s, CBB *cert_verify) 2351 { 2352 const struct ssl_sigalg *sigalg; 2353 CBB cbb_signature; 2354 EVP_PKEY_CTX *pctx = NULL; 2355 EVP_PKEY *pkey; 2356 EVP_MD_CTX mctx; 2357 const EVP_MD *md; 2358 const unsigned char *hdata; 2359 unsigned char *signature = NULL; 2360 size_t signature_len, hdata_len; 2361 int ret = 0; 2362 2363 EVP_MD_CTX_init(&mctx); 2364 2365 pkey = s->cert->key->privatekey; 2366 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2367 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2368 goto err; 2369 } 2370 if ((md = sigalg->md()) == NULL) { 2371 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 2372 goto err; 2373 } 2374 2375 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2376 SSLerror(s, ERR_R_INTERNAL_ERROR); 2377 goto err; 2378 } 2379 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2380 SSLerror(s, ERR_R_EVP_LIB); 2381 goto err; 2382 } 2383 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2384 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2385 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2386 SSLerror(s, ERR_R_EVP_LIB); 2387 goto err; 2388 } 2389 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2390 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2391 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2392 SSLerror(s, ERR_R_EVP_LIB); 2393 goto err; 2394 } 2395 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2396 SSLerror(s, ERR_R_EVP_LIB); 2397 goto err; 2398 } 2399 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2400 signature_len == 0) { 2401 SSLerror(s, ERR_R_EVP_LIB); 2402 goto err; 2403 } 2404 if ((signature = calloc(1, signature_len)) == NULL) { 2405 SSLerror(s, ERR_R_MALLOC_FAILURE); 2406 goto err; 2407 } 2408 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2409 SSLerror(s, ERR_R_EVP_LIB); 2410 goto err; 2411 } 2412 2413 if (!CBB_add_u16(cert_verify, sigalg->value)) 2414 goto err; 2415 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2416 goto err; 2417 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2418 goto err; 2419 if (!CBB_flush(cert_verify)) 2420 goto err; 2421 2422 ret = 1; 2423 2424 err: 2425 EVP_MD_CTX_cleanup(&mctx); 2426 free(signature); 2427 return ret; 2428 } 2429 2430 static int 2431 ssl3_send_client_verify_rsa(SSL *s, CBB *cert_verify) 2432 { 2433 CBB cbb_signature; 2434 EVP_PKEY *pkey; 2435 unsigned char data[EVP_MAX_MD_SIZE]; 2436 unsigned char *signature = NULL; 2437 unsigned int signature_len; 2438 size_t data_len; 2439 int ret = 0; 2440 2441 pkey = s->cert->key->privatekey; 2442 2443 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2444 goto err; 2445 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2446 goto err; 2447 if (RSA_sign(NID_md5_sha1, data, data_len, signature, 2448 &signature_len, pkey->pkey.rsa) <= 0 ) { 2449 SSLerror(s, ERR_R_RSA_LIB); 2450 goto err; 2451 } 2452 2453 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2454 goto err; 2455 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2456 goto err; 2457 if (!CBB_flush(cert_verify)) 2458 goto err; 2459 2460 ret = 1; 2461 err: 2462 free(signature); 2463 return ret; 2464 } 2465 2466 static int 2467 ssl3_send_client_verify_ec(SSL *s, CBB *cert_verify) 2468 { 2469 CBB cbb_signature; 2470 EVP_PKEY *pkey; 2471 unsigned char data[EVP_MAX_MD_SIZE]; 2472 unsigned char *signature = NULL; 2473 unsigned int signature_len; 2474 int ret = 0; 2475 2476 pkey = s->cert->key->privatekey; 2477 2478 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2479 goto err; 2480 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2481 goto err; 2482 if (!ECDSA_sign(pkey->save_type, &data[MD5_DIGEST_LENGTH], 2483 SHA_DIGEST_LENGTH, signature, &signature_len, pkey->pkey.ec)) { 2484 SSLerror(s, ERR_R_ECDSA_LIB); 2485 goto err; 2486 } 2487 2488 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2489 goto err; 2490 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2491 goto err; 2492 if (!CBB_flush(cert_verify)) 2493 goto err; 2494 2495 ret = 1; 2496 err: 2497 free(signature); 2498 return ret; 2499 } 2500 2501 #ifndef OPENSSL_NO_GOST 2502 static int 2503 ssl3_send_client_verify_gost(SSL *s, CBB *cert_verify) 2504 { 2505 CBB cbb_signature; 2506 EVP_MD_CTX mctx; 2507 EVP_PKEY_CTX *pctx; 2508 EVP_PKEY *pkey; 2509 const EVP_MD *md; 2510 const unsigned char *hdata; 2511 unsigned char *signature = NULL; 2512 size_t signature_len; 2513 size_t hdata_len; 2514 int nid; 2515 int ret = 0; 2516 2517 EVP_MD_CTX_init(&mctx); 2518 2519 pkey = s->cert->key->privatekey; 2520 2521 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2522 SSLerror(s, ERR_R_INTERNAL_ERROR); 2523 goto err; 2524 } 2525 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2526 (md = EVP_get_digestbynid(nid)) == NULL) { 2527 SSLerror(s, ERR_R_EVP_LIB); 2528 goto err; 2529 } 2530 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2531 SSLerror(s, ERR_R_EVP_LIB); 2532 goto err; 2533 } 2534 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2535 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2536 SSLerror(s, ERR_R_EVP_LIB); 2537 goto err; 2538 } 2539 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2540 SSLerror(s, ERR_R_EVP_LIB); 2541 goto err; 2542 } 2543 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2544 signature_len == 0) { 2545 SSLerror(s, ERR_R_EVP_LIB); 2546 goto err; 2547 } 2548 if ((signature = calloc(1, signature_len)) == NULL) { 2549 SSLerror(s, ERR_R_MALLOC_FAILURE); 2550 goto err; 2551 } 2552 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2553 SSLerror(s, ERR_R_EVP_LIB); 2554 goto err; 2555 } 2556 2557 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2558 goto err; 2559 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2560 goto err; 2561 if (!CBB_flush(cert_verify)) 2562 goto err; 2563 2564 ret = 1; 2565 err: 2566 EVP_MD_CTX_cleanup(&mctx); 2567 free(signature); 2568 return ret; 2569 } 2570 #endif 2571 2572 int 2573 ssl3_send_client_verify(SSL *s) 2574 { 2575 CBB cbb, cert_verify; 2576 EVP_PKEY *pkey; 2577 2578 memset(&cbb, 0, sizeof(cbb)); 2579 2580 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2581 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2582 SSL3_MT_CERTIFICATE_VERIFY)) 2583 goto err; 2584 2585 pkey = s->cert->key->privatekey; 2586 2587 /* 2588 * For TLS v1.2 send signature algorithm and signature 2589 * using agreed digest and cached handshake records. 2590 */ 2591 if (SSL_USE_SIGALGS(s)) { 2592 if (!ssl3_send_client_verify_sigalgs(s, &cert_verify)) 2593 goto err; 2594 } else if (pkey->type == EVP_PKEY_RSA) { 2595 if (!ssl3_send_client_verify_rsa(s, &cert_verify)) 2596 goto err; 2597 } else if (pkey->type == EVP_PKEY_EC) { 2598 if (!ssl3_send_client_verify_ec(s, &cert_verify)) 2599 goto err; 2600 #ifndef OPENSSL_NO_GOST 2601 } else if (pkey->type == NID_id_GostR3410_94 || 2602 pkey->type == NID_id_GostR3410_2001) { 2603 if (!ssl3_send_client_verify_gost(s, &cert_verify)) 2604 goto err; 2605 #endif 2606 } else { 2607 SSLerror(s, ERR_R_INTERNAL_ERROR); 2608 goto err; 2609 } 2610 2611 tls1_transcript_free(s); 2612 2613 if (!ssl3_handshake_msg_finish(s, &cbb)) 2614 goto err; 2615 2616 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2617 } 2618 2619 return (ssl3_handshake_write(s)); 2620 2621 err: 2622 CBB_cleanup(&cbb); 2623 2624 return (-1); 2625 } 2626 2627 int 2628 ssl3_send_client_certificate(SSL *s) 2629 { 2630 EVP_PKEY *pkey = NULL; 2631 X509 *x509 = NULL; 2632 CBB cbb, client_cert; 2633 int i; 2634 2635 memset(&cbb, 0, sizeof(cbb)); 2636 2637 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2638 if (s->cert->key->x509 == NULL || 2639 s->cert->key->privatekey == NULL) 2640 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2641 else 2642 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2643 } 2644 2645 /* We need to get a client cert */ 2646 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2647 /* 2648 * If we get an error, we need to 2649 * ssl->internal->rwstate = SSL_X509_LOOKUP; return(-1); 2650 * We then get retried later. 2651 */ 2652 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2653 if (i < 0) { 2654 s->internal->rwstate = SSL_X509_LOOKUP; 2655 return (-1); 2656 } 2657 s->internal->rwstate = SSL_NOTHING; 2658 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2659 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2660 if (!SSL_use_certificate(s, x509) || 2661 !SSL_use_PrivateKey(s, pkey)) 2662 i = 0; 2663 } else if (i == 1) { 2664 i = 0; 2665 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2666 } 2667 2668 X509_free(x509); 2669 EVP_PKEY_free(pkey); 2670 if (i == 0) { 2671 S3I(s)->hs.tls12.cert_request = 2; 2672 2673 /* There is no client certificate to verify. */ 2674 tls1_transcript_free(s); 2675 } 2676 2677 /* Ok, we have a cert */ 2678 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2679 } 2680 2681 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2682 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2683 SSL3_MT_CERTIFICATE)) 2684 goto err; 2685 if (!ssl3_output_cert_chain(s, &client_cert, 2686 (S3I(s)->hs.tls12.cert_request == 2) ? NULL : s->cert->key)) 2687 goto err; 2688 if (!ssl3_handshake_msg_finish(s, &cbb)) 2689 goto err; 2690 2691 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2692 } 2693 2694 /* SSL3_ST_CW_CERT_D */ 2695 return (ssl3_handshake_write(s)); 2696 2697 err: 2698 CBB_cleanup(&cbb); 2699 2700 return (0); 2701 } 2702 2703 #define has_bits(i,m) (((i)&(m)) == (m)) 2704 2705 int 2706 ssl3_check_cert_and_algorithm(SSL *s) 2707 { 2708 int i, idx; 2709 long alg_k, alg_a; 2710 EVP_PKEY *pkey = NULL; 2711 SESS_CERT *sc; 2712 DH *dh; 2713 2714 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2715 alg_a = S3I(s)->hs.cipher->algorithm_auth; 2716 2717 /* We don't have a certificate. */ 2718 if (alg_a & SSL_aNULL) 2719 return (1); 2720 2721 sc = SSI(s)->sess_cert; 2722 if (sc == NULL) { 2723 SSLerror(s, ERR_R_INTERNAL_ERROR); 2724 goto err; 2725 } 2726 dh = SSI(s)->sess_cert->peer_dh_tmp; 2727 2728 /* This is the passed certificate. */ 2729 2730 idx = sc->peer_cert_type; 2731 if (idx == SSL_PKEY_ECC) { 2732 if (ssl_check_srvr_ecc_cert_and_alg( 2733 sc->peer_pkeys[idx].x509, s) == 0) { 2734 /* check failed */ 2735 SSLerror(s, SSL_R_BAD_ECC_CERT); 2736 goto fatal_err; 2737 } else { 2738 return (1); 2739 } 2740 } 2741 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2742 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2743 EVP_PKEY_free(pkey); 2744 2745 /* Check that we have a certificate if we require one. */ 2746 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2747 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2748 goto fatal_err; 2749 } 2750 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2751 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2752 goto fatal_err; 2753 } 2754 if ((alg_k & SSL_kDHE) && 2755 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2756 SSLerror(s, SSL_R_MISSING_DH_KEY); 2757 goto fatal_err; 2758 } 2759 2760 return (1); 2761 fatal_err: 2762 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2763 err: 2764 return (0); 2765 } 2766 2767 /* 2768 * Check to see if handshake is full or resumed. Usually this is just a 2769 * case of checking to see if a cache hit has occurred. In the case of 2770 * session tickets we have to check the next message to be sure. 2771 */ 2772 2773 int 2774 ssl3_check_finished(SSL *s) 2775 { 2776 int ok; 2777 long n; 2778 2779 /* If we have no ticket it cannot be a resumed session. */ 2780 if (!s->session->tlsext_tick) 2781 return (1); 2782 /* this function is called when we really expect a Certificate 2783 * message, so permit appropriate message length */ 2784 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2785 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2786 if (!ok) 2787 return ((int)n); 2788 2789 S3I(s)->hs.tls12.reuse_message = 1; 2790 if ((S3I(s)->hs.tls12.message_type == SSL3_MT_FINISHED) || 2791 (S3I(s)->hs.tls12.message_type == SSL3_MT_NEWSESSION_TICKET)) 2792 return (2); 2793 2794 return (1); 2795 } 2796 2797 int 2798 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2799 { 2800 int i = 0; 2801 2802 #ifndef OPENSSL_NO_ENGINE 2803 if (s->ctx->internal->client_cert_engine) { 2804 i = ENGINE_load_ssl_client_cert( 2805 s->ctx->internal->client_cert_engine, s, 2806 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2807 if (i != 0) 2808 return (i); 2809 } 2810 #endif 2811 if (s->ctx->internal->client_cert_cb) 2812 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2813 return (i); 2814 } 2815