1 /* $OpenBSD: ssl_clnt.c,v 1.128 2022/01/08 12:59:58 jsing Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 /* ==================================================================== 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 /* ==================================================================== 112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 113 * 114 * Portions of the attached software ("Contribution") are developed by 115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 116 * 117 * The Contribution is licensed pursuant to the OpenSSL open source 118 * license provided above. 119 * 120 * ECC cipher suite support in OpenSSL originally written by 121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. 122 * 123 */ 124 /* ==================================================================== 125 * Copyright 2005 Nokia. All rights reserved. 126 * 127 * The portions of the attached software ("Contribution") is developed by 128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 129 * license. 130 * 131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 133 * support (see RFC 4279) to OpenSSL. 134 * 135 * No patent licenses or other rights except those expressly stated in 136 * the OpenSSL open source license shall be deemed granted or received 137 * expressly, by implication, estoppel, or otherwise. 138 * 139 * No assurances are provided by Nokia that the Contribution does not 140 * infringe the patent or other intellectual property rights of any third 141 * party or that the license provides you with all the necessary rights 142 * to make use of the Contribution. 143 * 144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 148 * OTHERWISE. 149 */ 150 151 #include <limits.h> 152 #include <stdint.h> 153 #include <stdio.h> 154 155 #include <openssl/bn.h> 156 #include <openssl/buffer.h> 157 #include <openssl/curve25519.h> 158 #include <openssl/dh.h> 159 #include <openssl/evp.h> 160 #include <openssl/md5.h> 161 #include <openssl/objects.h> 162 #include <openssl/opensslconf.h> 163 164 #ifndef OPENSSL_NO_ENGINE 165 #include <openssl/engine.h> 166 #endif 167 #ifndef OPENSSL_NO_GOST 168 #include <openssl/gost.h> 169 #endif 170 171 #include "bytestring.h" 172 #include "dtls_locl.h" 173 #include "ssl_locl.h" 174 #include "ssl_sigalgs.h" 175 #include "ssl_tlsext.h" 176 177 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b); 178 179 int 180 ssl3_connect(SSL *s) 181 { 182 int new_state, state, skip = 0; 183 int ret = -1; 184 185 ERR_clear_error(); 186 errno = 0; 187 188 s->internal->in_handshake++; 189 if (!SSL_in_init(s) || SSL_in_before(s)) 190 SSL_clear(s); 191 192 for (;;) { 193 state = S3I(s)->hs.state; 194 195 switch (S3I(s)->hs.state) { 196 case SSL_ST_RENEGOTIATE: 197 s->internal->renegotiate = 1; 198 S3I(s)->hs.state = SSL_ST_CONNECT; 199 s->ctx->internal->stats.sess_connect_renegotiate++; 200 /* break */ 201 case SSL_ST_BEFORE: 202 case SSL_ST_CONNECT: 203 case SSL_ST_BEFORE|SSL_ST_CONNECT: 204 case SSL_ST_OK|SSL_ST_CONNECT: 205 206 s->server = 0; 207 208 ssl_info_callback(s, SSL_CB_HANDSHAKE_START, 1); 209 210 if (!ssl_legacy_stack_version(s, s->version)) { 211 SSLerror(s, ERR_R_INTERNAL_ERROR); 212 ret = -1; 213 goto end; 214 } 215 216 if (!ssl_supported_tls_version_range(s, 217 &S3I(s)->hs.our_min_tls_version, 218 &S3I(s)->hs.our_max_tls_version)) { 219 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 220 ret = -1; 221 goto end; 222 } 223 224 if (!ssl3_setup_init_buffer(s)) { 225 ret = -1; 226 goto end; 227 } 228 if (!ssl3_setup_buffers(s)) { 229 ret = -1; 230 goto end; 231 } 232 if (!ssl_init_wbio_buffer(s, 0)) { 233 ret = -1; 234 goto end; 235 } 236 237 /* don't push the buffering BIO quite yet */ 238 239 if (!tls1_transcript_init(s)) { 240 ret = -1; 241 goto end; 242 } 243 244 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 245 s->ctx->internal->stats.sess_connect++; 246 s->internal->init_num = 0; 247 248 if (SSL_is_dtls(s)) { 249 /* mark client_random uninitialized */ 250 memset(s->s3->client_random, 0, 251 sizeof(s->s3->client_random)); 252 s->d1->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) && s->d1->send_cookie) { 273 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 274 S3I(s)->hs.tls12.next_state = SSL3_ST_CR_SRVR_HELLO_A; 275 } else 276 S3I(s)->hs.state = SSL3_ST_CR_SRVR_HELLO_A; 277 278 s->internal->init_num = 0; 279 280 /* turn on buffering for the next lot of output */ 281 if (s->bbio != s->wbio) 282 s->wbio = BIO_push(s->bbio, s->wbio); 283 284 break; 285 286 case SSL3_ST_CR_SRVR_HELLO_A: 287 case SSL3_ST_CR_SRVR_HELLO_B: 288 ret = ssl3_get_server_hello(s); 289 if (ret <= 0) 290 goto end; 291 292 if (s->internal->hit) { 293 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 294 if (!SSL_is_dtls(s)) { 295 if (s->internal->tlsext_ticket_expected) { 296 /* receive renewed session ticket */ 297 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 298 } 299 300 /* No client certificate verification. */ 301 tls1_transcript_free(s); 302 } 303 } else if (SSL_is_dtls(s)) { 304 S3I(s)->hs.state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 305 } else { 306 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 307 } 308 s->internal->init_num = 0; 309 break; 310 311 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 312 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 313 ret = ssl3_get_dtls_hello_verify(s); 314 if (ret <= 0) 315 goto end; 316 dtls1_stop_timer(s); 317 if (s->d1->send_cookie) /* start again, with a cookie */ 318 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 319 else 320 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 321 s->internal->init_num = 0; 322 break; 323 324 case SSL3_ST_CR_CERT_A: 325 case SSL3_ST_CR_CERT_B: 326 ret = ssl3_check_finished(s); 327 if (ret <= 0) 328 goto end; 329 if (ret == 2) { 330 s->internal->hit = 1; 331 if (s->internal->tlsext_ticket_expected) 332 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 333 else 334 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 335 s->internal->init_num = 0; 336 break; 337 } 338 /* Check if it is anon DH/ECDH. */ 339 if (!(S3I(s)->hs.cipher->algorithm_auth & 340 SSL_aNULL)) { 341 ret = ssl3_get_server_certificate(s); 342 if (ret <= 0) 343 goto end; 344 if (s->internal->tlsext_status_expected) 345 S3I(s)->hs.state = SSL3_ST_CR_CERT_STATUS_A; 346 else 347 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 348 } else { 349 skip = 1; 350 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 351 } 352 s->internal->init_num = 0; 353 break; 354 355 case SSL3_ST_CR_KEY_EXCH_A: 356 case SSL3_ST_CR_KEY_EXCH_B: 357 ret = ssl3_get_server_key_exchange(s); 358 if (ret <= 0) 359 goto end; 360 S3I(s)->hs.state = SSL3_ST_CR_CERT_REQ_A; 361 s->internal->init_num = 0; 362 363 /* 364 * At this point we check that we have the 365 * required stuff from the server. 366 */ 367 if (!ssl3_check_cert_and_algorithm(s)) { 368 ret = -1; 369 goto end; 370 } 371 break; 372 373 case SSL3_ST_CR_CERT_REQ_A: 374 case SSL3_ST_CR_CERT_REQ_B: 375 ret = ssl3_get_certificate_request(s); 376 if (ret <= 0) 377 goto end; 378 S3I(s)->hs.state = SSL3_ST_CR_SRVR_DONE_A; 379 s->internal->init_num = 0; 380 break; 381 382 case SSL3_ST_CR_SRVR_DONE_A: 383 case SSL3_ST_CR_SRVR_DONE_B: 384 ret = ssl3_get_server_done(s); 385 if (ret <= 0) 386 goto end; 387 if (SSL_is_dtls(s)) 388 dtls1_stop_timer(s); 389 if (S3I(s)->hs.tls12.cert_request) 390 S3I(s)->hs.state = SSL3_ST_CW_CERT_A; 391 else 392 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 393 s->internal->init_num = 0; 394 395 break; 396 397 case SSL3_ST_CW_CERT_A: 398 case SSL3_ST_CW_CERT_B: 399 case SSL3_ST_CW_CERT_C: 400 case SSL3_ST_CW_CERT_D: 401 if (SSL_is_dtls(s)) 402 dtls1_start_timer(s); 403 ret = ssl3_send_client_certificate(s); 404 if (ret <= 0) 405 goto end; 406 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 407 s->internal->init_num = 0; 408 break; 409 410 case SSL3_ST_CW_KEY_EXCH_A: 411 case SSL3_ST_CW_KEY_EXCH_B: 412 if (SSL_is_dtls(s)) 413 dtls1_start_timer(s); 414 ret = ssl3_send_client_key_exchange(s); 415 if (ret <= 0) 416 goto end; 417 /* 418 * EAY EAY EAY need to check for DH fix cert 419 * sent back 420 */ 421 /* 422 * For TLS, cert_req is set to 2, so a cert chain 423 * of nothing is sent, but no verify packet is sent 424 */ 425 /* 426 * XXX: For now, we do not support client 427 * authentication in ECDH cipher suites with 428 * ECDH (rather than ECDSA) certificates. 429 * We need to skip the certificate verify 430 * message when client's ECDH public key is sent 431 * inside the client certificate. 432 */ 433 if (S3I(s)->hs.tls12.cert_request == 1) { 434 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_A; 435 } else { 436 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 437 S3I(s)->change_cipher_spec = 0; 438 } 439 if (!SSL_is_dtls(s)) { 440 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 441 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 442 S3I(s)->change_cipher_spec = 0; 443 } 444 } 445 446 s->internal->init_num = 0; 447 break; 448 449 case SSL3_ST_CW_CERT_VRFY_A: 450 case SSL3_ST_CW_CERT_VRFY_B: 451 if (SSL_is_dtls(s)) 452 dtls1_start_timer(s); 453 ret = ssl3_send_client_verify(s); 454 if (ret <= 0) 455 goto end; 456 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 457 s->internal->init_num = 0; 458 S3I(s)->change_cipher_spec = 0; 459 break; 460 461 case SSL3_ST_CW_CHANGE_A: 462 case SSL3_ST_CW_CHANGE_B: 463 if (SSL_is_dtls(s) && !s->internal->hit) 464 dtls1_start_timer(s); 465 ret = ssl3_send_change_cipher_spec(s, 466 SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B); 467 if (ret <= 0) 468 goto end; 469 470 S3I(s)->hs.state = SSL3_ST_CW_FINISHED_A; 471 s->internal->init_num = 0; 472 s->session->cipher = S3I(s)->hs.cipher; 473 474 if (!tls1_setup_key_block(s)) { 475 ret = -1; 476 goto end; 477 } 478 if (!tls1_change_write_cipher_state(s)) { 479 ret = -1; 480 goto end; 481 } 482 break; 483 484 case SSL3_ST_CW_FINISHED_A: 485 case SSL3_ST_CW_FINISHED_B: 486 if (SSL_is_dtls(s) && !s->internal->hit) 487 dtls1_start_timer(s); 488 ret = ssl3_send_finished(s, SSL3_ST_CW_FINISHED_A, 489 SSL3_ST_CW_FINISHED_B); 490 if (ret <= 0) 491 goto end; 492 if (!SSL_is_dtls(s)) 493 s->s3->flags |= SSL3_FLAGS_CCS_OK; 494 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 495 496 /* clear flags */ 497 if (s->internal->hit) { 498 S3I(s)->hs.tls12.next_state = SSL_ST_OK; 499 } else { 500 /* Allow NewSessionTicket if ticket expected */ 501 if (s->internal->tlsext_ticket_expected) 502 S3I(s)->hs.tls12.next_state = 503 SSL3_ST_CR_SESSION_TICKET_A; 504 else 505 S3I(s)->hs.tls12.next_state = 506 SSL3_ST_CR_FINISHED_A; 507 } 508 s->internal->init_num = 0; 509 break; 510 511 case SSL3_ST_CR_SESSION_TICKET_A: 512 case SSL3_ST_CR_SESSION_TICKET_B: 513 ret = ssl3_get_new_session_ticket(s); 514 if (ret <= 0) 515 goto end; 516 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 517 s->internal->init_num = 0; 518 break; 519 520 case SSL3_ST_CR_CERT_STATUS_A: 521 case SSL3_ST_CR_CERT_STATUS_B: 522 ret = ssl3_get_cert_status(s); 523 if (ret <= 0) 524 goto end; 525 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 526 s->internal->init_num = 0; 527 break; 528 529 case SSL3_ST_CR_FINISHED_A: 530 case SSL3_ST_CR_FINISHED_B: 531 if (SSL_is_dtls(s)) 532 s->d1->change_cipher_spec_ok = 1; 533 else 534 s->s3->flags |= SSL3_FLAGS_CCS_OK; 535 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 536 SSL3_ST_CR_FINISHED_B); 537 if (ret <= 0) 538 goto end; 539 if (SSL_is_dtls(s)) 540 dtls1_stop_timer(s); 541 542 if (s->internal->hit) 543 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 544 else 545 S3I(s)->hs.state = SSL_ST_OK; 546 s->internal->init_num = 0; 547 break; 548 549 case SSL3_ST_CW_FLUSH: 550 s->internal->rwstate = SSL_WRITING; 551 if (BIO_flush(s->wbio) <= 0) { 552 if (SSL_is_dtls(s)) { 553 /* If the write error was fatal, stop trying */ 554 if (!BIO_should_retry(s->wbio)) { 555 s->internal->rwstate = SSL_NOTHING; 556 S3I(s)->hs.state = S3I(s)->hs.tls12.next_state; 557 } 558 } 559 ret = -1; 560 goto end; 561 } 562 s->internal->rwstate = SSL_NOTHING; 563 S3I(s)->hs.state = S3I(s)->hs.tls12.next_state; 564 break; 565 566 case SSL_ST_OK: 567 /* clean a few things up */ 568 tls1_cleanup_key_block(s); 569 570 if (S3I(s)->handshake_transcript != NULL) { 571 SSLerror(s, ERR_R_INTERNAL_ERROR); 572 ret = -1; 573 goto end; 574 } 575 576 if (!SSL_is_dtls(s)) 577 ssl3_release_init_buffer(s); 578 579 ssl_free_wbio_buffer(s); 580 581 s->internal->init_num = 0; 582 s->internal->renegotiate = 0; 583 s->internal->new_session = 0; 584 585 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 586 if (s->internal->hit) 587 s->ctx->internal->stats.sess_hit++; 588 589 ret = 1; 590 /* s->server=0; */ 591 s->internal->handshake_func = ssl3_connect; 592 s->ctx->internal->stats.sess_connect_good++; 593 594 ssl_info_callback(s, SSL_CB_HANDSHAKE_DONE, 1); 595 596 if (SSL_is_dtls(s)) { 597 /* done with handshaking */ 598 s->d1->handshake_read_seq = 0; 599 s->d1->next_handshake_write_seq = 0; 600 } 601 602 goto end; 603 /* break; */ 604 605 default: 606 SSLerror(s, SSL_R_UNKNOWN_STATE); 607 ret = -1; 608 goto end; 609 /* break; */ 610 } 611 612 /* did we do anything */ 613 if (!S3I(s)->hs.tls12.reuse_message && !skip) { 614 if (s->internal->debug) { 615 if ((ret = BIO_flush(s->wbio)) <= 0) 616 goto end; 617 } 618 619 if (S3I(s)->hs.state != state) { 620 new_state = S3I(s)->hs.state; 621 S3I(s)->hs.state = state; 622 ssl_info_callback(s, SSL_CB_CONNECT_LOOP, 1); 623 S3I(s)->hs.state = new_state; 624 } 625 } 626 skip = 0; 627 } 628 629 end: 630 s->internal->in_handshake--; 631 ssl_info_callback(s, SSL_CB_CONNECT_EXIT, ret); 632 633 return (ret); 634 } 635 636 int 637 ssl3_send_client_hello(SSL *s) 638 { 639 CBB cbb, client_hello, session_id, cookie, cipher_suites; 640 CBB compression_methods; 641 uint16_t max_version; 642 size_t sl; 643 644 memset(&cbb, 0, sizeof(cbb)); 645 646 if (S3I(s)->hs.state == SSL3_ST_CW_CLNT_HELLO_A) { 647 SSL_SESSION *sess = s->session; 648 649 if (!ssl_max_supported_version(s, &max_version)) { 650 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 651 return (-1); 652 } 653 s->version = max_version; 654 655 if (sess == NULL || 656 sess->ssl_version != s->version || 657 (!sess->session_id_length && !sess->tlsext_tick) || 658 sess->not_resumable) { 659 if (!ssl_get_new_session(s, 0)) 660 goto err; 661 } 662 /* else use the pre-loaded session */ 663 664 /* 665 * If a DTLS ClientHello message is being resent after a 666 * HelloVerifyRequest, we must retain the original client 667 * random value. 668 */ 669 if (!SSL_is_dtls(s) || s->d1->send_cookie == 0) 670 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE); 671 672 if (!ssl3_handshake_msg_start(s, &cbb, &client_hello, 673 SSL3_MT_CLIENT_HELLO)) 674 goto err; 675 676 if (!CBB_add_u16(&client_hello, s->version)) 677 goto err; 678 679 /* Random stuff */ 680 if (!CBB_add_bytes(&client_hello, s->s3->client_random, 681 sizeof(s->s3->client_random))) 682 goto err; 683 684 /* Session ID */ 685 if (!CBB_add_u8_length_prefixed(&client_hello, &session_id)) 686 goto err; 687 if (!s->internal->new_session && 688 s->session->session_id_length > 0) { 689 sl = s->session->session_id_length; 690 if (sl > sizeof(s->session->session_id)) { 691 SSLerror(s, ERR_R_INTERNAL_ERROR); 692 goto err; 693 } 694 if (!CBB_add_bytes(&session_id, 695 s->session->session_id, sl)) 696 goto err; 697 } 698 699 /* DTLS Cookie. */ 700 if (SSL_is_dtls(s)) { 701 if (s->d1->cookie_len > sizeof(s->d1->cookie)) { 702 SSLerror(s, ERR_R_INTERNAL_ERROR); 703 goto err; 704 } 705 if (!CBB_add_u8_length_prefixed(&client_hello, &cookie)) 706 goto err; 707 if (!CBB_add_bytes(&cookie, s->d1->cookie, 708 s->d1->cookie_len)) 709 goto err; 710 } 711 712 /* Ciphers supported */ 713 if (!CBB_add_u16_length_prefixed(&client_hello, &cipher_suites)) 714 return 0; 715 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), 716 &cipher_suites)) { 717 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE); 718 goto err; 719 } 720 721 /* Add in compression methods (null) */ 722 if (!CBB_add_u8_length_prefixed(&client_hello, 723 &compression_methods)) 724 goto err; 725 if (!CBB_add_u8(&compression_methods, 0)) 726 goto err; 727 728 /* TLS extensions */ 729 if (!tlsext_client_build(s, SSL_TLSEXT_MSG_CH, &client_hello)) { 730 SSLerror(s, ERR_R_INTERNAL_ERROR); 731 goto err; 732 } 733 734 if (!ssl3_handshake_msg_finish(s, &cbb)) 735 goto err; 736 737 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_B; 738 } 739 740 /* SSL3_ST_CW_CLNT_HELLO_B */ 741 return (ssl3_handshake_write(s)); 742 743 err: 744 CBB_cleanup(&cbb); 745 746 return (-1); 747 } 748 749 int 750 ssl3_get_dtls_hello_verify(SSL *s) 751 { 752 CBS hello_verify_request, cookie; 753 size_t cookie_len; 754 uint16_t ssl_version; 755 int al, ret; 756 757 if ((ret = ssl3_get_message(s, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 758 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, s->internal->max_cert_list)) <= 0) 759 return ret; 760 761 if (S3I(s)->hs.tls12.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 762 s->d1->send_cookie = 0; 763 S3I(s)->hs.tls12.reuse_message = 1; 764 return (1); 765 } 766 767 if (s->internal->init_num < 0) 768 goto decode_err; 769 770 CBS_init(&hello_verify_request, s->internal->init_msg, 771 s->internal->init_num); 772 773 if (!CBS_get_u16(&hello_verify_request, &ssl_version)) 774 goto decode_err; 775 if (!CBS_get_u8_length_prefixed(&hello_verify_request, &cookie)) 776 goto decode_err; 777 if (CBS_len(&hello_verify_request) != 0) 778 goto decode_err; 779 780 /* 781 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should always 782 * contain DTLSv1.0 the version that is going to be negotiated. 783 * Tolerate DTLSv1.2 just in case. 784 */ 785 if (ssl_version != DTLS1_VERSION && ssl_version != DTLS1_2_VERSION) { 786 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 787 s->version = (s->version & 0xff00) | (ssl_version & 0xff); 788 al = SSL_AD_PROTOCOL_VERSION; 789 goto fatal_err; 790 } 791 792 if (!CBS_write_bytes(&cookie, s->d1->cookie, 793 sizeof(s->d1->cookie), &cookie_len)) { 794 s->d1->cookie_len = 0; 795 al = SSL_AD_ILLEGAL_PARAMETER; 796 goto fatal_err; 797 } 798 s->d1->cookie_len = cookie_len; 799 s->d1->send_cookie = 1; 800 801 return 1; 802 803 decode_err: 804 al = SSL_AD_DECODE_ERROR; 805 fatal_err: 806 ssl3_send_alert(s, SSL3_AL_FATAL, al); 807 return -1; 808 } 809 810 int 811 ssl3_get_server_hello(SSL *s) 812 { 813 CBS cbs, server_random, session_id; 814 uint16_t server_version, cipher_suite; 815 uint8_t compression_method; 816 const SSL_CIPHER *cipher; 817 const SSL_METHOD *method; 818 unsigned long alg_k; 819 size_t outlen; 820 int al, ret; 821 822 s->internal->first_packet = 1; 823 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 824 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000 /* ?? */)) <= 0) 825 return ret; 826 s->internal->first_packet = 0; 827 828 if (s->internal->init_num < 0) 829 goto decode_err; 830 831 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 832 833 if (SSL_is_dtls(s)) { 834 if (S3I(s)->hs.tls12.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 835 if (s->d1->send_cookie == 0) { 836 S3I(s)->hs.tls12.reuse_message = 1; 837 return (1); 838 } else { 839 /* Already sent a cookie. */ 840 al = SSL_AD_UNEXPECTED_MESSAGE; 841 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 842 goto fatal_err; 843 } 844 } 845 } 846 847 if (S3I(s)->hs.tls12.message_type != SSL3_MT_SERVER_HELLO) { 848 al = SSL_AD_UNEXPECTED_MESSAGE; 849 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 850 goto fatal_err; 851 } 852 853 if (!CBS_get_u16(&cbs, &server_version)) 854 goto decode_err; 855 856 if (!ssl_check_version_from_server(s, server_version)) { 857 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 858 s->version = (s->version & 0xff00) | (server_version & 0xff); 859 al = SSL_AD_PROTOCOL_VERSION; 860 goto fatal_err; 861 } 862 S3I(s)->hs.peer_legacy_version = server_version; 863 s->version = server_version; 864 865 S3I(s)->hs.negotiated_tls_version = ssl_tls_version(server_version); 866 if (S3I(s)->hs.negotiated_tls_version == 0) { 867 SSLerror(s, ERR_R_INTERNAL_ERROR); 868 goto err; 869 } 870 871 if ((method = ssl_get_method(server_version)) == NULL) { 872 SSLerror(s, ERR_R_INTERNAL_ERROR); 873 goto err; 874 } 875 s->method = method; 876 877 /* Server random. */ 878 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 879 goto decode_err; 880 if (!CBS_write_bytes(&server_random, s->s3->server_random, 881 sizeof(s->s3->server_random), NULL)) 882 goto err; 883 884 if (S3I(s)->hs.our_max_tls_version >= TLS1_2_VERSION && 885 S3I(s)->hs.negotiated_tls_version < S3I(s)->hs.our_max_tls_version) { 886 /* 887 * RFC 8446 section 4.1.3. We must not downgrade if the server 888 * random value contains the TLS 1.2 or TLS 1.1 magical value. 889 */ 890 if (!CBS_skip(&server_random, 891 CBS_len(&server_random) - sizeof(tls13_downgrade_12))) 892 goto err; 893 if (S3I(s)->hs.negotiated_tls_version == TLS1_2_VERSION && 894 CBS_mem_equal(&server_random, tls13_downgrade_12, 895 sizeof(tls13_downgrade_12))) { 896 al = SSL_AD_ILLEGAL_PARAMETER; 897 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 898 goto fatal_err; 899 } 900 if (CBS_mem_equal(&server_random, tls13_downgrade_11, 901 sizeof(tls13_downgrade_11))) { 902 al = SSL_AD_ILLEGAL_PARAMETER; 903 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 904 goto fatal_err; 905 } 906 } 907 908 /* Session ID. */ 909 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 910 goto decode_err; 911 912 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 913 al = SSL_AD_ILLEGAL_PARAMETER; 914 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 915 goto fatal_err; 916 } 917 918 /* Cipher suite. */ 919 if (!CBS_get_u16(&cbs, &cipher_suite)) 920 goto decode_err; 921 922 /* 923 * Check if we want to resume the session based on external 924 * pre-shared secret. 925 */ 926 if (s->internal->tls_session_secret_cb) { 927 SSL_CIPHER *pref_cipher = NULL; 928 s->session->master_key_length = sizeof(s->session->master_key); 929 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 930 &s->session->master_key_length, NULL, &pref_cipher, 931 s->internal->tls_session_secret_cb_arg)) { 932 s->session->cipher = pref_cipher ? pref_cipher : 933 ssl3_get_cipher_by_value(cipher_suite); 934 s->s3->flags |= SSL3_FLAGS_CCS_OK; 935 } 936 } 937 938 if (s->session->session_id_length != 0 && 939 CBS_mem_equal(&session_id, s->session->session_id, 940 s->session->session_id_length)) { 941 if (s->sid_ctx_length != s->session->sid_ctx_length || 942 timingsafe_memcmp(s->session->sid_ctx, 943 s->sid_ctx, s->sid_ctx_length) != 0) { 944 /* actually a client application bug */ 945 al = SSL_AD_ILLEGAL_PARAMETER; 946 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 947 goto fatal_err; 948 } 949 s->s3->flags |= SSL3_FLAGS_CCS_OK; 950 s->internal->hit = 1; 951 } else { 952 /* a miss or crap from the other end */ 953 954 /* If we were trying for session-id reuse, make a new 955 * SSL_SESSION so we don't stuff up other people */ 956 s->internal->hit = 0; 957 if (s->session->session_id_length > 0) { 958 if (!ssl_get_new_session(s, 0)) { 959 al = SSL_AD_INTERNAL_ERROR; 960 goto fatal_err; 961 } 962 } 963 964 /* 965 * XXX - improve the handling for the case where there is a 966 * zero length session identifier. 967 */ 968 if (!CBS_write_bytes(&session_id, s->session->session_id, 969 sizeof(s->session->session_id), &outlen)) 970 goto err; 971 s->session->session_id_length = outlen; 972 973 s->session->ssl_version = s->version; 974 } 975 976 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 977 al = SSL_AD_ILLEGAL_PARAMETER; 978 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 979 goto fatal_err; 980 } 981 982 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 983 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 984 S3I(s)->hs.negotiated_tls_version < TLS1_2_VERSION) { 985 al = SSL_AD_ILLEGAL_PARAMETER; 986 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 987 goto fatal_err; 988 } 989 990 if (!ssl_cipher_in_list(SSL_get_ciphers(s), cipher)) { 991 /* we did not say we would use this cipher */ 992 al = SSL_AD_ILLEGAL_PARAMETER; 993 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 994 goto fatal_err; 995 } 996 997 /* 998 * Depending on the session caching (internal/external), the cipher 999 * and/or cipher_id values may not be set. Make sure that 1000 * cipher_id is set and use it for comparison. 1001 */ 1002 if (s->session->cipher) 1003 s->session->cipher_id = s->session->cipher->id; 1004 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 1005 al = SSL_AD_ILLEGAL_PARAMETER; 1006 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1007 goto fatal_err; 1008 } 1009 S3I(s)->hs.cipher = cipher; 1010 1011 if (!tls1_transcript_hash_init(s)) 1012 goto err; 1013 1014 /* 1015 * Don't digest cached records if no sigalgs: we may need them for 1016 * client authentication. 1017 */ 1018 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 1019 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST))) 1020 tls1_transcript_free(s); 1021 1022 if (!CBS_get_u8(&cbs, &compression_method)) 1023 goto decode_err; 1024 1025 if (compression_method != 0) { 1026 al = SSL_AD_ILLEGAL_PARAMETER; 1027 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1028 goto fatal_err; 1029 } 1030 1031 if (!tlsext_client_parse(s, SSL_TLSEXT_MSG_SH, &cbs, &al)) { 1032 SSLerror(s, SSL_R_PARSE_TLSEXT); 1033 goto fatal_err; 1034 } 1035 1036 if (CBS_len(&cbs) != 0) 1037 goto decode_err; 1038 1039 /* 1040 * Determine if we need to see RI. Strictly speaking if we want to 1041 * avoid an attack we should *always* see RI even on initial server 1042 * hello because the client doesn't see any renegotiation during an 1043 * attack. However this would mean we could not connect to any server 1044 * which doesn't support RI so for the immediate future tolerate RI 1045 * absence on initial connect only. 1046 */ 1047 if (!S3I(s)->renegotiate_seen && 1048 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1049 al = SSL_AD_HANDSHAKE_FAILURE; 1050 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1051 goto fatal_err; 1052 } 1053 1054 if (ssl_check_serverhello_tlsext(s) <= 0) { 1055 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1056 goto err; 1057 } 1058 1059 return (1); 1060 1061 decode_err: 1062 /* wrong packet length */ 1063 al = SSL_AD_DECODE_ERROR; 1064 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1065 fatal_err: 1066 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1067 err: 1068 return (-1); 1069 } 1070 1071 int 1072 ssl3_get_server_certificate(SSL *s) 1073 { 1074 int al, i, ret; 1075 CBS cbs, cert_list; 1076 X509 *x = NULL; 1077 const unsigned char *q; 1078 STACK_OF(X509) *sk = NULL; 1079 EVP_PKEY *pkey = NULL; 1080 1081 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1082 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list)) <= 0) 1083 return ret; 1084 1085 ret = -1; 1086 1087 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1088 S3I(s)->hs.tls12.reuse_message = 1; 1089 return (1); 1090 } 1091 1092 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE) { 1093 al = SSL_AD_UNEXPECTED_MESSAGE; 1094 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1095 goto fatal_err; 1096 } 1097 1098 if ((sk = sk_X509_new_null()) == NULL) { 1099 SSLerror(s, ERR_R_MALLOC_FAILURE); 1100 goto err; 1101 } 1102 1103 if (s->internal->init_num < 0) 1104 goto decode_err; 1105 1106 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 1107 if (CBS_len(&cbs) < 3) 1108 goto decode_err; 1109 1110 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1111 CBS_len(&cbs) != 0) { 1112 al = SSL_AD_DECODE_ERROR; 1113 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1114 goto fatal_err; 1115 } 1116 1117 while (CBS_len(&cert_list) > 0) { 1118 CBS cert; 1119 1120 if (CBS_len(&cert_list) < 3) 1121 goto decode_err; 1122 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1123 al = SSL_AD_DECODE_ERROR; 1124 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1125 goto fatal_err; 1126 } 1127 1128 q = CBS_data(&cert); 1129 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1130 if (x == NULL) { 1131 al = SSL_AD_BAD_CERTIFICATE; 1132 SSLerror(s, ERR_R_ASN1_LIB); 1133 goto fatal_err; 1134 } 1135 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1136 al = SSL_AD_DECODE_ERROR; 1137 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1138 goto fatal_err; 1139 } 1140 if (!sk_X509_push(sk, x)) { 1141 SSLerror(s, ERR_R_MALLOC_FAILURE); 1142 goto err; 1143 } 1144 x = NULL; 1145 } 1146 1147 i = ssl_verify_cert_chain(s, sk); 1148 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1149 al = ssl_verify_alarm_type(s->verify_result); 1150 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1151 goto fatal_err; 1152 1153 } 1154 ERR_clear_error(); /* but we keep s->verify_result */ 1155 1156 /* 1157 * Inconsistency alert: cert_chain does include the peer's 1158 * certificate, which we don't include in s3_srvr.c 1159 */ 1160 x = sk_X509_value(sk, 0); 1161 1162 pkey = X509_get_pubkey(x); 1163 1164 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1165 x = NULL; 1166 al = SSL3_AL_FATAL; 1167 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1168 goto fatal_err; 1169 } 1170 1171 i = ssl_cert_type(x, pkey); 1172 if (i < 0) { 1173 x = NULL; 1174 al = SSL3_AL_FATAL; 1175 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1176 goto fatal_err; 1177 } 1178 s->session->peer_cert_type = i; 1179 1180 sk_X509_pop_free(s->session->cert_chain, X509_free); 1181 s->session->cert_chain = sk; 1182 sk = NULL; 1183 1184 X509_up_ref(x); 1185 X509_free(s->session->peer_pkeys[i].x509); 1186 s->session->peer_pkeys[i].x509 = x; 1187 s->session->peer_key = &s->session->peer_pkeys[i]; 1188 1189 X509_up_ref(x); 1190 X509_free(s->session->peer); 1191 s->session->peer = x; 1192 1193 s->session->verify_result = s->verify_result; 1194 1195 x = NULL; 1196 ret = 1; 1197 1198 if (0) { 1199 decode_err: 1200 /* wrong packet length */ 1201 al = SSL_AD_DECODE_ERROR; 1202 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1203 fatal_err: 1204 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1205 } 1206 err: 1207 EVP_PKEY_free(pkey); 1208 X509_free(x); 1209 sk_X509_pop_free(sk, X509_free); 1210 1211 return (ret); 1212 } 1213 1214 static int 1215 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1216 { 1217 int nid = NID_dhKeyAgreement; 1218 int invalid_params, invalid_key; 1219 long alg_a; 1220 1221 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1222 1223 tls_key_share_free(S3I(s)->hs.key_share); 1224 if ((S3I(s)->hs.key_share = tls_key_share_new_nid(nid)) == NULL) 1225 goto err; 1226 1227 if (!tls_key_share_peer_params(S3I(s)->hs.key_share, cbs, 1228 &invalid_params)) 1229 goto decode_err; 1230 if (!tls_key_share_peer_public(S3I(s)->hs.key_share, cbs, 1231 &invalid_key)) 1232 goto decode_err; 1233 1234 if (invalid_params) { 1235 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1236 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1237 goto err; 1238 } 1239 if (invalid_key) { 1240 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1241 SSLerror(s, SSL_R_BAD_DH_PUB_KEY_LENGTH); 1242 goto err; 1243 } 1244 1245 if (alg_a & SSL_aRSA) 1246 *pkey = X509_get_pubkey(s->session->peer_pkeys[SSL_PKEY_RSA].x509); 1247 else 1248 /* XXX - Anonymous DH, so no certificate or pkey. */ 1249 *pkey = NULL; 1250 1251 return 1; 1252 1253 decode_err: 1254 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1255 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1256 1257 err: 1258 return 0; 1259 } 1260 1261 static int 1262 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1263 { 1264 CBS public; 1265 uint8_t curve_type; 1266 uint16_t curve_id; 1267 long alg_a; 1268 1269 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1270 1271 if (!CBS_get_u8(cbs, &curve_type)) 1272 goto decode_err; 1273 if (!CBS_get_u16(cbs, &curve_id)) 1274 goto decode_err; 1275 1276 /* Only named curves are supported. */ 1277 if (curve_type != NAMED_CURVE_TYPE) { 1278 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1279 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1280 goto err; 1281 } 1282 1283 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1284 goto decode_err; 1285 1286 /* 1287 * Check that the curve is one of our preferences - if it is not, 1288 * the server has sent us an invalid curve. 1289 */ 1290 if (!tls1_check_curve(s, curve_id)) { 1291 SSLerror(s, SSL_R_WRONG_CURVE); 1292 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1293 goto err; 1294 } 1295 1296 tls_key_share_free(S3I(s)->hs.key_share); 1297 if ((S3I(s)->hs.key_share = tls_key_share_new(curve_id)) == NULL) 1298 goto err; 1299 1300 if (!tls_key_share_peer_public(S3I(s)->hs.key_share, &public, NULL)) 1301 goto err; 1302 1303 /* 1304 * The ECC/TLS specification does not mention the use of DSA to sign 1305 * ECParameters in the server key exchange message. We do support RSA 1306 * and ECDSA. 1307 */ 1308 if (alg_a & SSL_aRSA) 1309 *pkey = X509_get_pubkey(s->session->peer_pkeys[SSL_PKEY_RSA].x509); 1310 else if (alg_a & SSL_aECDSA) 1311 *pkey = X509_get_pubkey(s->session->peer_pkeys[SSL_PKEY_ECC].x509); 1312 else 1313 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1314 *pkey = NULL; 1315 1316 return 1; 1317 1318 decode_err: 1319 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1320 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1321 err: 1322 return 0; 1323 } 1324 1325 int 1326 ssl3_get_server_key_exchange(SSL *s) 1327 { 1328 CBS cbs, signature; 1329 EVP_PKEY *pkey = NULL; 1330 EVP_MD_CTX *md_ctx; 1331 const unsigned char *param; 1332 size_t param_len; 1333 long alg_k, alg_a; 1334 int al, ret; 1335 1336 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 1337 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1338 1339 /* 1340 * Use same message size as in ssl3_get_certificate_request() 1341 * as ServerKeyExchange message may be skipped. 1342 */ 1343 if ((ret = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1344 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list)) <= 0) 1345 return ret; 1346 1347 if ((md_ctx = EVP_MD_CTX_new()) == NULL) 1348 goto err; 1349 1350 if (s->internal->init_num < 0) 1351 goto err; 1352 1353 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 1354 1355 if (S3I(s)->hs.tls12.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1356 /* 1357 * Do not skip server key exchange if this cipher suite uses 1358 * ephemeral keys. 1359 */ 1360 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1361 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1362 al = SSL_AD_UNEXPECTED_MESSAGE; 1363 goto fatal_err; 1364 } 1365 1366 S3I(s)->hs.tls12.reuse_message = 1; 1367 EVP_MD_CTX_free(md_ctx); 1368 return (1); 1369 } 1370 1371 param = CBS_data(&cbs); 1372 param_len = CBS_len(&cbs); 1373 1374 if (alg_k & SSL_kDHE) { 1375 if (!ssl3_get_server_kex_dhe(s, &pkey, &cbs)) 1376 goto err; 1377 } else if (alg_k & SSL_kECDHE) { 1378 if (!ssl3_get_server_kex_ecdhe(s, &pkey, &cbs)) 1379 goto err; 1380 } else if (alg_k != 0) { 1381 al = SSL_AD_UNEXPECTED_MESSAGE; 1382 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1383 goto fatal_err; 1384 } 1385 1386 param_len -= CBS_len(&cbs); 1387 1388 /* if it was signed, check the signature */ 1389 if (pkey != NULL) { 1390 uint16_t sigalg_value = SIGALG_NONE; 1391 const struct ssl_sigalg *sigalg; 1392 EVP_PKEY_CTX *pctx; 1393 1394 if (SSL_USE_SIGALGS(s)) { 1395 if (!CBS_get_u16(&cbs, &sigalg_value)) 1396 goto decode_err; 1397 } 1398 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1399 goto decode_err; 1400 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1401 al = SSL_AD_DECODE_ERROR; 1402 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1403 goto fatal_err; 1404 } 1405 1406 if ((sigalg = ssl_sigalg_for_peer(s, pkey, 1407 sigalg_value)) == NULL) { 1408 al = SSL_AD_DECODE_ERROR; 1409 goto fatal_err; 1410 } 1411 S3I(s)->hs.peer_sigalg = sigalg; 1412 1413 if (!EVP_DigestVerifyInit(md_ctx, &pctx, sigalg->md(), 1414 NULL, pkey)) 1415 goto err; 1416 if (!EVP_DigestVerifyUpdate(md_ctx, s->s3->client_random, 1417 SSL3_RANDOM_SIZE)) 1418 goto err; 1419 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1420 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1421 RSA_PKCS1_PSS_PADDING) || 1422 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1423 goto err; 1424 if (!EVP_DigestVerifyUpdate(md_ctx, s->s3->server_random, 1425 SSL3_RANDOM_SIZE)) 1426 goto err; 1427 if (!EVP_DigestVerifyUpdate(md_ctx, param, param_len)) 1428 goto err; 1429 if (EVP_DigestVerifyFinal(md_ctx, CBS_data(&signature), 1430 CBS_len(&signature)) <= 0) { 1431 al = SSL_AD_DECRYPT_ERROR; 1432 SSLerror(s, SSL_R_BAD_SIGNATURE); 1433 goto fatal_err; 1434 } 1435 } else { 1436 /* aNULL does not need public keys. */ 1437 if (!(alg_a & SSL_aNULL)) { 1438 SSLerror(s, ERR_R_INTERNAL_ERROR); 1439 goto err; 1440 } 1441 } 1442 1443 if (CBS_len(&cbs) != 0) { 1444 al = SSL_AD_DECODE_ERROR; 1445 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1446 goto fatal_err; 1447 } 1448 1449 EVP_PKEY_free(pkey); 1450 EVP_MD_CTX_free(md_ctx); 1451 1452 return (1); 1453 1454 decode_err: 1455 al = SSL_AD_DECODE_ERROR; 1456 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1457 1458 fatal_err: 1459 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1460 1461 err: 1462 EVP_PKEY_free(pkey); 1463 EVP_MD_CTX_free(md_ctx); 1464 1465 return (-1); 1466 } 1467 1468 int 1469 ssl3_get_certificate_request(SSL *s) 1470 { 1471 CBS cert_request, cert_types, rdn_list; 1472 X509_NAME *xn = NULL; 1473 const unsigned char *q; 1474 STACK_OF(X509_NAME) *ca_sk = NULL; 1475 int ret; 1476 1477 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1478 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list)) <= 0) 1479 return ret; 1480 1481 ret = 0; 1482 1483 S3I(s)->hs.tls12.cert_request = 0; 1484 1485 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_DONE) { 1486 S3I(s)->hs.tls12.reuse_message = 1; 1487 /* 1488 * If we get here we don't need any cached handshake records 1489 * as we wont be doing client auth. 1490 */ 1491 tls1_transcript_free(s); 1492 return (1); 1493 } 1494 1495 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1496 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1497 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1498 goto err; 1499 } 1500 1501 /* TLS does not like anon-DH with client cert */ 1502 if (S3I(s)->hs.cipher->algorithm_auth & SSL_aNULL) { 1503 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1504 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1505 goto err; 1506 } 1507 1508 if (s->internal->init_num < 0) 1509 goto decode_err; 1510 CBS_init(&cert_request, s->internal->init_msg, s->internal->init_num); 1511 1512 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1513 SSLerror(s, ERR_R_MALLOC_FAILURE); 1514 goto err; 1515 } 1516 1517 if (!CBS_get_u8_length_prefixed(&cert_request, &cert_types)) 1518 goto decode_err; 1519 1520 if (SSL_USE_SIGALGS(s)) { 1521 CBS sigalgs; 1522 1523 if (CBS_len(&cert_request) < 2) { 1524 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1525 goto err; 1526 } 1527 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1528 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1529 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1530 goto err; 1531 } 1532 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1533 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1534 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1535 goto err; 1536 } 1537 if (!CBS_stow(&sigalgs, &S3I(s)->hs.sigalgs, 1538 &S3I(s)->hs.sigalgs_len)) 1539 goto err; 1540 } 1541 1542 /* get the CA RDNs */ 1543 if (CBS_len(&cert_request) < 2) { 1544 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1545 goto err; 1546 } 1547 1548 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1549 CBS_len(&cert_request) != 0) { 1550 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1551 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1552 goto err; 1553 } 1554 1555 while (CBS_len(&rdn_list) > 0) { 1556 CBS rdn; 1557 1558 if (CBS_len(&rdn_list) < 2) { 1559 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1560 goto err; 1561 } 1562 1563 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1564 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1565 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1566 goto err; 1567 } 1568 1569 q = CBS_data(&rdn); 1570 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1571 ssl3_send_alert(s, SSL3_AL_FATAL, 1572 SSL_AD_DECODE_ERROR); 1573 SSLerror(s, ERR_R_ASN1_LIB); 1574 goto err; 1575 } 1576 1577 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1578 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1579 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1580 goto err; 1581 } 1582 if (!sk_X509_NAME_push(ca_sk, xn)) { 1583 SSLerror(s, ERR_R_MALLOC_FAILURE); 1584 goto err; 1585 } 1586 xn = NULL; /* avoid free in err block */ 1587 } 1588 1589 /* we should setup a certificate to return.... */ 1590 S3I(s)->hs.tls12.cert_request = 1; 1591 sk_X509_NAME_pop_free(S3I(s)->hs.tls12.ca_names, X509_NAME_free); 1592 S3I(s)->hs.tls12.ca_names = ca_sk; 1593 ca_sk = NULL; 1594 1595 ret = 1; 1596 if (0) { 1597 decode_err: 1598 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1599 } 1600 err: 1601 X509_NAME_free(xn); 1602 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1603 return (ret); 1604 } 1605 1606 static int 1607 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1608 { 1609 return (X509_NAME_cmp(*a, *b)); 1610 } 1611 1612 int 1613 ssl3_get_new_session_ticket(SSL *s) 1614 { 1615 uint32_t lifetime_hint; 1616 CBS cbs, session_ticket; 1617 int al, ret; 1618 1619 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1620 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384)) <= 0) 1621 return ret; 1622 1623 ret = 0; 1624 1625 if (S3I(s)->hs.tls12.message_type == SSL3_MT_FINISHED) { 1626 S3I(s)->hs.tls12.reuse_message = 1; 1627 return (1); 1628 } 1629 if (S3I(s)->hs.tls12.message_type != SSL3_MT_NEWSESSION_TICKET) { 1630 al = SSL_AD_UNEXPECTED_MESSAGE; 1631 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1632 goto fatal_err; 1633 } 1634 1635 if (s->internal->init_num < 0) { 1636 al = SSL_AD_DECODE_ERROR; 1637 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1638 goto fatal_err; 1639 } 1640 1641 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 1642 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1643 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1644 CBS_len(&cbs) != 0) { 1645 al = SSL_AD_DECODE_ERROR; 1646 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1647 goto fatal_err; 1648 } 1649 s->session->tlsext_tick_lifetime_hint = lifetime_hint; 1650 1651 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1652 &s->session->tlsext_ticklen)) { 1653 SSLerror(s, ERR_R_MALLOC_FAILURE); 1654 goto err; 1655 } 1656 1657 /* 1658 * There are two ways to detect a resumed ticket sesion. 1659 * One is to set an appropriate session ID and then the server 1660 * must return a match in ServerHello. This allows the normal 1661 * client session ID matching to work and we know much 1662 * earlier that the ticket has been accepted. 1663 * 1664 * The other way is to set zero length session ID when the 1665 * ticket is presented and rely on the handshake to determine 1666 * session resumption. 1667 * 1668 * We choose the former approach because this fits in with 1669 * assumptions elsewhere in OpenSSL. The session ID is set 1670 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1671 * ticket. 1672 */ 1673 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1674 s->session->session_id, &s->session->session_id_length, 1675 EVP_sha256(), NULL); 1676 ret = 1; 1677 return (ret); 1678 fatal_err: 1679 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1680 err: 1681 return (-1); 1682 } 1683 1684 int 1685 ssl3_get_cert_status(SSL *s) 1686 { 1687 CBS cert_status, response; 1688 uint8_t status_type; 1689 int al, ret; 1690 1691 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1692 SSL3_ST_CR_CERT_STATUS_B, -1, 16384)) <= 0) 1693 return ret; 1694 1695 if (S3I(s)->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1696 /* 1697 * Tell the callback the server did not send us an OSCP 1698 * response, and has decided to head directly to key exchange. 1699 */ 1700 if (s->ctx->internal->tlsext_status_cb) { 1701 free(s->internal->tlsext_ocsp_resp); 1702 s->internal->tlsext_ocsp_resp = NULL; 1703 s->internal->tlsext_ocsp_resp_len = 0; 1704 1705 ret = s->ctx->internal->tlsext_status_cb(s, 1706 s->ctx->internal->tlsext_status_arg); 1707 if (ret == 0) { 1708 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1709 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1710 goto fatal_err; 1711 } 1712 if (ret < 0) { 1713 al = SSL_AD_INTERNAL_ERROR; 1714 SSLerror(s, ERR_R_MALLOC_FAILURE); 1715 goto fatal_err; 1716 } 1717 } 1718 S3I(s)->hs.tls12.reuse_message = 1; 1719 return (1); 1720 } 1721 1722 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE && 1723 S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE_STATUS) { 1724 al = SSL_AD_UNEXPECTED_MESSAGE; 1725 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1726 goto fatal_err; 1727 } 1728 1729 if (s->internal->init_num < 0) { 1730 /* need at least status type + length */ 1731 al = SSL_AD_DECODE_ERROR; 1732 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1733 goto fatal_err; 1734 } 1735 1736 CBS_init(&cert_status, s->internal->init_msg, s->internal->init_num); 1737 if (!CBS_get_u8(&cert_status, &status_type) || 1738 CBS_len(&cert_status) < 3) { 1739 /* need at least status type + length */ 1740 al = SSL_AD_DECODE_ERROR; 1741 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1742 goto fatal_err; 1743 } 1744 1745 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1746 al = SSL_AD_DECODE_ERROR; 1747 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1748 goto fatal_err; 1749 } 1750 1751 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1752 CBS_len(&cert_status) != 0) { 1753 al = SSL_AD_DECODE_ERROR; 1754 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1755 goto fatal_err; 1756 } 1757 1758 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1759 &s->internal->tlsext_ocsp_resp_len)) { 1760 al = SSL_AD_INTERNAL_ERROR; 1761 SSLerror(s, ERR_R_MALLOC_FAILURE); 1762 goto fatal_err; 1763 } 1764 1765 if (s->ctx->internal->tlsext_status_cb) { 1766 int ret; 1767 ret = s->ctx->internal->tlsext_status_cb(s, 1768 s->ctx->internal->tlsext_status_arg); 1769 if (ret == 0) { 1770 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1771 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1772 goto fatal_err; 1773 } 1774 if (ret < 0) { 1775 al = SSL_AD_INTERNAL_ERROR; 1776 SSLerror(s, ERR_R_MALLOC_FAILURE); 1777 goto fatal_err; 1778 } 1779 } 1780 return (1); 1781 fatal_err: 1782 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1783 return (-1); 1784 } 1785 1786 int 1787 ssl3_get_server_done(SSL *s) 1788 { 1789 int ret; 1790 1791 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1792 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1793 30 /* should be very small, like 0 :-) */)) <= 0) 1794 return ret; 1795 1796 if (s->internal->init_num != 0) { 1797 /* should contain no data */ 1798 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1799 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1800 return -1; 1801 } 1802 1803 return 1; 1804 } 1805 1806 static int 1807 ssl3_send_client_kex_rsa(SSL *s, CBB *cbb) 1808 { 1809 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1810 unsigned char *enc_pms = NULL; 1811 uint16_t max_legacy_version; 1812 EVP_PKEY *pkey = NULL; 1813 RSA *rsa; 1814 int ret = 0; 1815 int enc_len; 1816 CBB epms; 1817 1818 /* 1819 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1820 */ 1821 1822 pkey = X509_get_pubkey(s->session->peer_pkeys[SSL_PKEY_RSA].x509); 1823 if (pkey == NULL || (rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) { 1824 SSLerror(s, ERR_R_INTERNAL_ERROR); 1825 goto err; 1826 } 1827 1828 /* 1829 * Our maximum legacy protocol version - while RFC 5246 section 7.4.7.1 1830 * says "The latest (newest) version supported by the client", if we're 1831 * doing RSA key exchange then we have to presume that we're talking to 1832 * a server that does not understand the supported versions extension 1833 * and therefore our maximum version is that sent in the ClientHello. 1834 */ 1835 if (!ssl_max_legacy_version(s, &max_legacy_version)) 1836 goto err; 1837 pms[0] = max_legacy_version >> 8; 1838 pms[1] = max_legacy_version & 0xff; 1839 arc4random_buf(&pms[2], sizeof(pms) - 2); 1840 1841 if ((enc_pms = malloc(RSA_size(rsa))) == NULL) { 1842 SSLerror(s, ERR_R_MALLOC_FAILURE); 1843 goto err; 1844 } 1845 1846 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, rsa, 1847 RSA_PKCS1_PADDING); 1848 if (enc_len <= 0) { 1849 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1850 goto err; 1851 } 1852 1853 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1854 goto err; 1855 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 1856 goto err; 1857 if (!CBB_flush(cbb)) 1858 goto err; 1859 1860 if (!tls12_derive_master_secret(s, pms, sizeof(pms))) 1861 goto err; 1862 1863 ret = 1; 1864 1865 err: 1866 explicit_bzero(pms, sizeof(pms)); 1867 EVP_PKEY_free(pkey); 1868 free(enc_pms); 1869 1870 return ret; 1871 } 1872 1873 static int 1874 ssl3_send_client_kex_dhe(SSL *s, CBB *cbb) 1875 { 1876 uint8_t *key = NULL; 1877 size_t key_len = 0; 1878 int ret = 0; 1879 1880 /* Ensure that we have an ephemeral key from the server for DHE. */ 1881 if (S3I(s)->hs.key_share == NULL) { 1882 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1883 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1884 goto err; 1885 } 1886 1887 if (!tls_key_share_generate(S3I(s)->hs.key_share)) 1888 goto err; 1889 if (!tls_key_share_public(S3I(s)->hs.key_share, cbb)) 1890 goto err; 1891 if (!tls_key_share_derive(S3I(s)->hs.key_share, &key, &key_len)) 1892 goto err; 1893 1894 if (!tls12_derive_master_secret(s, key, key_len)) 1895 goto err; 1896 1897 ret = 1; 1898 1899 err: 1900 freezero(key, key_len); 1901 1902 return ret; 1903 } 1904 1905 static int 1906 ssl3_send_client_kex_ecdhe(SSL *s, CBB *cbb) 1907 { 1908 uint8_t *key = NULL; 1909 size_t key_len = 0; 1910 CBB public; 1911 int ret = 0; 1912 1913 /* Ensure that we have an ephemeral key for ECDHE. */ 1914 if (S3I(s)->hs.key_share == NULL) { 1915 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1916 SSLerror(s, ERR_R_INTERNAL_ERROR); 1917 goto err; 1918 } 1919 1920 if (!tls_key_share_generate(S3I(s)->hs.key_share)) 1921 goto err; 1922 1923 if (!CBB_add_u8_length_prefixed(cbb, &public)) 1924 return 0; 1925 if (!tls_key_share_public(S3I(s)->hs.key_share, &public)) 1926 goto err; 1927 if (!CBB_flush(cbb)) 1928 goto err; 1929 1930 if (!tls_key_share_derive(S3I(s)->hs.key_share, &key, &key_len)) 1931 goto err; 1932 1933 if (!tls12_derive_master_secret(s, key, key_len)) 1934 goto err; 1935 1936 ret = 1; 1937 1938 err: 1939 freezero(key, key_len); 1940 1941 return ret; 1942 } 1943 1944 static int 1945 ssl3_send_client_kex_gost(SSL *s, CBB *cbb) 1946 { 1947 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 1948 EVP_PKEY *pub_key = NULL; 1949 EVP_PKEY_CTX *pkey_ctx; 1950 X509 *peer_cert; 1951 size_t msglen; 1952 unsigned int md_len; 1953 EVP_MD_CTX *ukm_hash; 1954 int ret = -1; 1955 int nid; 1956 CBB gostblob; 1957 1958 /* Get server sertificate PKEY and create ctx from it */ 1959 peer_cert = s->session->peer_pkeys[SSL_PKEY_GOST01].x509; 1960 if (peer_cert == NULL) { 1961 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 1962 goto err; 1963 } 1964 1965 pub_key = X509_get_pubkey(peer_cert); 1966 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 1967 1968 /* 1969 * If we have send a certificate, and certificate key parameters match 1970 * those of server certificate, use certificate key for key exchange. 1971 * Otherwise, generate ephemeral key pair. 1972 */ 1973 EVP_PKEY_encrypt_init(pkey_ctx); 1974 1975 /* Generate session key. */ 1976 arc4random_buf(premaster_secret, 32); 1977 1978 /* 1979 * If we have client certificate, use its secret as peer key. 1980 */ 1981 if (S3I(s)->hs.tls12.cert_request && s->cert->key->privatekey) { 1982 if (EVP_PKEY_derive_set_peer(pkey_ctx, 1983 s->cert->key->privatekey) <=0) { 1984 /* 1985 * If there was an error - just ignore it. 1986 * Ephemeral key would be used. 1987 */ 1988 ERR_clear_error(); 1989 } 1990 } 1991 1992 /* 1993 * Compute shared IV and store it in algorithm-specific context data. 1994 */ 1995 ukm_hash = EVP_MD_CTX_new(); 1996 if (ukm_hash == NULL) { 1997 SSLerror(s, ERR_R_MALLOC_FAILURE); 1998 goto err; 1999 } 2000 2001 /* XXX check handshake hash instead. */ 2002 if (S3I(s)->hs.cipher->algorithm2 & SSL_HANDSHAKE_MAC_GOST94) 2003 nid = NID_id_GostR3411_94; 2004 else 2005 nid = NID_id_tc26_gost3411_2012_256; 2006 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2007 goto err; 2008 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2009 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2010 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2011 EVP_MD_CTX_free(ukm_hash); 2012 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2013 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2014 SSLerror(s, SSL_R_LIBRARY_BUG); 2015 goto err; 2016 } 2017 2018 /* 2019 * Make GOST keytransport blob message, encapsulate it into sequence. 2020 */ 2021 msglen = 255; 2022 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2023 32) < 0) { 2024 SSLerror(s, SSL_R_LIBRARY_BUG); 2025 goto err; 2026 } 2027 2028 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2029 goto err; 2030 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2031 goto err; 2032 if (!CBB_flush(cbb)) 2033 goto err; 2034 2035 /* Check if pubkey from client certificate was used. */ 2036 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2037 NULL) > 0) { 2038 /* Set flag "skip certificate verify". */ 2039 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2040 } 2041 EVP_PKEY_CTX_free(pkey_ctx); 2042 2043 if (!tls12_derive_master_secret(s, premaster_secret, 32)) 2044 goto err; 2045 2046 ret = 1; 2047 2048 err: 2049 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2050 EVP_PKEY_free(pub_key); 2051 2052 return (ret); 2053 } 2054 2055 int 2056 ssl3_send_client_key_exchange(SSL *s) 2057 { 2058 unsigned long alg_k; 2059 CBB cbb, kex; 2060 2061 memset(&cbb, 0, sizeof(cbb)); 2062 2063 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2064 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2065 2066 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2067 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2068 goto err; 2069 2070 if (alg_k & SSL_kRSA) { 2071 if (!ssl3_send_client_kex_rsa(s, &kex)) 2072 goto err; 2073 } else if (alg_k & SSL_kDHE) { 2074 if (!ssl3_send_client_kex_dhe(s, &kex)) 2075 goto err; 2076 } else if (alg_k & SSL_kECDHE) { 2077 if (!ssl3_send_client_kex_ecdhe(s, &kex)) 2078 goto err; 2079 } else if (alg_k & SSL_kGOST) { 2080 if (ssl3_send_client_kex_gost(s, &kex) != 1) 2081 goto err; 2082 } else { 2083 ssl3_send_alert(s, SSL3_AL_FATAL, 2084 SSL_AD_HANDSHAKE_FAILURE); 2085 SSLerror(s, ERR_R_INTERNAL_ERROR); 2086 goto err; 2087 } 2088 2089 if (!ssl3_handshake_msg_finish(s, &cbb)) 2090 goto err; 2091 2092 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2093 } 2094 2095 /* SSL3_ST_CW_KEY_EXCH_B */ 2096 return (ssl3_handshake_write(s)); 2097 2098 err: 2099 CBB_cleanup(&cbb); 2100 2101 return (-1); 2102 } 2103 2104 static int 2105 ssl3_send_client_verify_sigalgs(SSL *s, EVP_PKEY *pkey, 2106 const struct ssl_sigalg *sigalg, CBB *cert_verify) 2107 { 2108 CBB cbb_signature; 2109 EVP_PKEY_CTX *pctx = NULL; 2110 EVP_MD_CTX *mctx = NULL; 2111 const unsigned char *hdata; 2112 unsigned char *signature = NULL; 2113 size_t signature_len, hdata_len; 2114 int ret = 0; 2115 2116 if ((mctx = EVP_MD_CTX_new()) == NULL) 2117 goto err; 2118 2119 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2120 SSLerror(s, ERR_R_INTERNAL_ERROR); 2121 goto err; 2122 } 2123 if (!EVP_DigestSignInit(mctx, &pctx, sigalg->md(), NULL, pkey)) { 2124 SSLerror(s, ERR_R_EVP_LIB); 2125 goto err; 2126 } 2127 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2128 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2129 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2130 SSLerror(s, ERR_R_EVP_LIB); 2131 goto err; 2132 } 2133 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2134 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2135 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2136 SSLerror(s, ERR_R_EVP_LIB); 2137 goto err; 2138 } 2139 if (!EVP_DigestSignUpdate(mctx, hdata, hdata_len)) { 2140 SSLerror(s, ERR_R_EVP_LIB); 2141 goto err; 2142 } 2143 if (!EVP_DigestSignFinal(mctx, NULL, &signature_len) || 2144 signature_len == 0) { 2145 SSLerror(s, ERR_R_EVP_LIB); 2146 goto err; 2147 } 2148 if ((signature = calloc(1, signature_len)) == NULL) { 2149 SSLerror(s, ERR_R_MALLOC_FAILURE); 2150 goto err; 2151 } 2152 if (!EVP_DigestSignFinal(mctx, signature, &signature_len)) { 2153 SSLerror(s, ERR_R_EVP_LIB); 2154 goto err; 2155 } 2156 2157 if (!CBB_add_u16(cert_verify, sigalg->value)) 2158 goto err; 2159 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2160 goto err; 2161 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2162 goto err; 2163 if (!CBB_flush(cert_verify)) 2164 goto err; 2165 2166 ret = 1; 2167 2168 err: 2169 EVP_MD_CTX_free(mctx); 2170 free(signature); 2171 return ret; 2172 } 2173 2174 static int 2175 ssl3_send_client_verify_rsa(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2176 { 2177 CBB cbb_signature; 2178 RSA *rsa; 2179 unsigned char data[EVP_MAX_MD_SIZE]; 2180 unsigned char *signature = NULL; 2181 unsigned int signature_len; 2182 size_t data_len; 2183 int ret = 0; 2184 2185 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2186 goto err; 2187 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2188 goto err; 2189 if ((rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) 2190 goto err; 2191 if (RSA_sign(NID_md5_sha1, data, data_len, signature, &signature_len, 2192 rsa) <= 0 ) { 2193 SSLerror(s, ERR_R_RSA_LIB); 2194 goto err; 2195 } 2196 2197 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2198 goto err; 2199 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2200 goto err; 2201 if (!CBB_flush(cert_verify)) 2202 goto err; 2203 2204 ret = 1; 2205 err: 2206 free(signature); 2207 return ret; 2208 } 2209 2210 static int 2211 ssl3_send_client_verify_ec(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2212 { 2213 CBB cbb_signature; 2214 EC_KEY *eckey; 2215 unsigned char data[EVP_MAX_MD_SIZE]; 2216 unsigned char *signature = NULL; 2217 unsigned int signature_len; 2218 int ret = 0; 2219 2220 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2221 goto err; 2222 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2223 goto err; 2224 if ((eckey = EVP_PKEY_get0_EC_KEY(pkey)) == NULL) 2225 goto err; 2226 if (!ECDSA_sign(0, &data[MD5_DIGEST_LENGTH], SHA_DIGEST_LENGTH, 2227 signature, &signature_len, eckey)) { 2228 SSLerror(s, ERR_R_ECDSA_LIB); 2229 goto err; 2230 } 2231 2232 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2233 goto err; 2234 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2235 goto err; 2236 if (!CBB_flush(cert_verify)) 2237 goto err; 2238 2239 ret = 1; 2240 err: 2241 free(signature); 2242 return ret; 2243 } 2244 2245 #ifndef OPENSSL_NO_GOST 2246 static int 2247 ssl3_send_client_verify_gost(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2248 { 2249 CBB cbb_signature; 2250 EVP_MD_CTX *mctx; 2251 EVP_PKEY_CTX *pctx; 2252 const EVP_MD *md; 2253 const unsigned char *hdata; 2254 unsigned char *signature = NULL; 2255 size_t signature_len; 2256 size_t hdata_len; 2257 int nid; 2258 int ret = 0; 2259 2260 if ((mctx = EVP_MD_CTX_new()) == NULL) 2261 goto err; 2262 2263 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2264 SSLerror(s, ERR_R_INTERNAL_ERROR); 2265 goto err; 2266 } 2267 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2268 (md = EVP_get_digestbynid(nid)) == NULL) { 2269 SSLerror(s, ERR_R_EVP_LIB); 2270 goto err; 2271 } 2272 if (!EVP_DigestSignInit(mctx, &pctx, md, NULL, pkey)) { 2273 SSLerror(s, ERR_R_EVP_LIB); 2274 goto err; 2275 } 2276 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2277 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2278 SSLerror(s, ERR_R_EVP_LIB); 2279 goto err; 2280 } 2281 if (!EVP_DigestSignUpdate(mctx, hdata, hdata_len)) { 2282 SSLerror(s, ERR_R_EVP_LIB); 2283 goto err; 2284 } 2285 if (!EVP_DigestSignFinal(mctx, NULL, &signature_len) || 2286 signature_len == 0) { 2287 SSLerror(s, ERR_R_EVP_LIB); 2288 goto err; 2289 } 2290 if ((signature = calloc(1, signature_len)) == NULL) { 2291 SSLerror(s, ERR_R_MALLOC_FAILURE); 2292 goto err; 2293 } 2294 if (!EVP_DigestSignFinal(mctx, signature, &signature_len)) { 2295 SSLerror(s, ERR_R_EVP_LIB); 2296 goto err; 2297 } 2298 2299 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2300 goto err; 2301 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2302 goto err; 2303 if (!CBB_flush(cert_verify)) 2304 goto err; 2305 2306 ret = 1; 2307 err: 2308 EVP_MD_CTX_free(mctx); 2309 free(signature); 2310 return ret; 2311 } 2312 #endif 2313 2314 int 2315 ssl3_send_client_verify(SSL *s) 2316 { 2317 const struct ssl_sigalg *sigalg; 2318 CBB cbb, cert_verify; 2319 EVP_PKEY *pkey; 2320 2321 memset(&cbb, 0, sizeof(cbb)); 2322 2323 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2324 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2325 SSL3_MT_CERTIFICATE_VERIFY)) 2326 goto err; 2327 2328 pkey = s->cert->key->privatekey; 2329 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2330 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2331 goto err; 2332 } 2333 S3I(s)->hs.our_sigalg = sigalg; 2334 2335 /* 2336 * For TLS v1.2 send signature algorithm and signature using 2337 * agreed digest and cached handshake records. 2338 */ 2339 if (SSL_USE_SIGALGS(s)) { 2340 if (!ssl3_send_client_verify_sigalgs(s, pkey, sigalg, 2341 &cert_verify)) 2342 goto err; 2343 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_RSA) { 2344 if (!ssl3_send_client_verify_rsa(s, pkey, &cert_verify)) 2345 goto err; 2346 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) { 2347 if (!ssl3_send_client_verify_ec(s, pkey, &cert_verify)) 2348 goto err; 2349 #ifndef OPENSSL_NO_GOST 2350 } else if (EVP_PKEY_id(pkey) == NID_id_GostR3410_94 || 2351 EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) { 2352 if (!ssl3_send_client_verify_gost(s, pkey, &cert_verify)) 2353 goto err; 2354 #endif 2355 } else { 2356 SSLerror(s, ERR_R_INTERNAL_ERROR); 2357 goto err; 2358 } 2359 2360 tls1_transcript_free(s); 2361 2362 if (!ssl3_handshake_msg_finish(s, &cbb)) 2363 goto err; 2364 2365 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2366 } 2367 2368 return (ssl3_handshake_write(s)); 2369 2370 err: 2371 CBB_cleanup(&cbb); 2372 2373 return (-1); 2374 } 2375 2376 int 2377 ssl3_send_client_certificate(SSL *s) 2378 { 2379 EVP_PKEY *pkey = NULL; 2380 X509 *x509 = NULL; 2381 CBB cbb, client_cert; 2382 int i; 2383 2384 memset(&cbb, 0, sizeof(cbb)); 2385 2386 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2387 if (s->cert->key->x509 == NULL || 2388 s->cert->key->privatekey == NULL) 2389 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2390 else 2391 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2392 } 2393 2394 /* We need to get a client cert */ 2395 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2396 /* 2397 * If we get an error, we need to 2398 * ssl->internal->rwstate = SSL_X509_LOOKUP; return(-1); 2399 * We then get retried later. 2400 */ 2401 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2402 if (i < 0) { 2403 s->internal->rwstate = SSL_X509_LOOKUP; 2404 return (-1); 2405 } 2406 s->internal->rwstate = SSL_NOTHING; 2407 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2408 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2409 if (!SSL_use_certificate(s, x509) || 2410 !SSL_use_PrivateKey(s, pkey)) 2411 i = 0; 2412 } else if (i == 1) { 2413 i = 0; 2414 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2415 } 2416 2417 X509_free(x509); 2418 EVP_PKEY_free(pkey); 2419 if (i == 0) { 2420 S3I(s)->hs.tls12.cert_request = 2; 2421 2422 /* There is no client certificate to verify. */ 2423 tls1_transcript_free(s); 2424 } 2425 2426 /* Ok, we have a cert */ 2427 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2428 } 2429 2430 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2431 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2432 SSL3_MT_CERTIFICATE)) 2433 goto err; 2434 if (!ssl3_output_cert_chain(s, &client_cert, 2435 (S3I(s)->hs.tls12.cert_request == 2) ? NULL : s->cert->key)) 2436 goto err; 2437 if (!ssl3_handshake_msg_finish(s, &cbb)) 2438 goto err; 2439 2440 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2441 } 2442 2443 /* SSL3_ST_CW_CERT_D */ 2444 return (ssl3_handshake_write(s)); 2445 2446 err: 2447 CBB_cleanup(&cbb); 2448 2449 return (0); 2450 } 2451 2452 #define has_bits(i,m) (((i)&(m)) == (m)) 2453 2454 int 2455 ssl3_check_cert_and_algorithm(SSL *s) 2456 { 2457 long alg_k, alg_a; 2458 EVP_PKEY *pkey = NULL; 2459 int nid = NID_undef; 2460 int i, idx; 2461 2462 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2463 alg_a = S3I(s)->hs.cipher->algorithm_auth; 2464 2465 /* We don't have a certificate. */ 2466 if (alg_a & SSL_aNULL) 2467 return (1); 2468 2469 if (S3I(s)->hs.key_share != NULL) 2470 nid = tls_key_share_nid(S3I(s)->hs.key_share); 2471 2472 /* This is the passed certificate. */ 2473 2474 idx = s->session->peer_cert_type; 2475 if (idx == SSL_PKEY_ECC) { 2476 if (ssl_check_srvr_ecc_cert_and_alg( 2477 s->session->peer_pkeys[idx].x509, s) == 0) { 2478 /* check failed */ 2479 SSLerror(s, SSL_R_BAD_ECC_CERT); 2480 goto fatal_err; 2481 } else { 2482 return (1); 2483 } 2484 } 2485 pkey = X509_get_pubkey(s->session->peer_pkeys[idx].x509); 2486 i = X509_certificate_type(s->session->peer_pkeys[idx].x509, pkey); 2487 EVP_PKEY_free(pkey); 2488 2489 /* Check that we have a certificate if we require one. */ 2490 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2491 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2492 goto fatal_err; 2493 } 2494 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2495 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2496 goto fatal_err; 2497 } 2498 if ((alg_k & SSL_kDHE) && 2499 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (nid == NID_dhKeyAgreement))) { 2500 SSLerror(s, SSL_R_MISSING_DH_KEY); 2501 goto fatal_err; 2502 } 2503 2504 return (1); 2505 2506 fatal_err: 2507 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2508 2509 return (0); 2510 } 2511 2512 /* 2513 * Check to see if handshake is full or resumed. Usually this is just a 2514 * case of checking to see if a cache hit has occurred. In the case of 2515 * session tickets we have to check the next message to be sure. 2516 */ 2517 2518 int 2519 ssl3_check_finished(SSL *s) 2520 { 2521 int ret; 2522 2523 /* If we have no ticket it cannot be a resumed session. */ 2524 if (!s->session->tlsext_tick) 2525 return (1); 2526 /* this function is called when we really expect a Certificate 2527 * message, so permit appropriate message length */ 2528 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2529 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list)) <= 0) 2530 return ret; 2531 2532 S3I(s)->hs.tls12.reuse_message = 1; 2533 if ((S3I(s)->hs.tls12.message_type == SSL3_MT_FINISHED) || 2534 (S3I(s)->hs.tls12.message_type == SSL3_MT_NEWSESSION_TICKET)) 2535 return (2); 2536 2537 return (1); 2538 } 2539 2540 int 2541 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2542 { 2543 int i = 0; 2544 2545 #ifndef OPENSSL_NO_ENGINE 2546 if (s->ctx->internal->client_cert_engine) { 2547 i = ENGINE_load_ssl_client_cert( 2548 s->ctx->internal->client_cert_engine, s, 2549 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2550 if (i != 0) 2551 return (i); 2552 } 2553 #endif 2554 if (s->ctx->internal->client_cert_cb) 2555 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2556 return (i); 2557 } 2558