1 /* $OpenBSD: ssl_clnt.c,v 1.163 2023/12/29 12:24:33 tb 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_GOST 165 #include <openssl/gost.h> 166 #endif 167 168 #include "bytestring.h" 169 #include "dtls_local.h" 170 #include "ssl_local.h" 171 #include "ssl_sigalgs.h" 172 #include "ssl_tlsext.h" 173 174 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b); 175 176 static int ssl3_send_client_hello(SSL *s); 177 static int ssl3_get_dtls_hello_verify(SSL *s); 178 static int ssl3_get_server_hello(SSL *s); 179 static int ssl3_get_certificate_request(SSL *s); 180 static int ssl3_get_new_session_ticket(SSL *s); 181 static int ssl3_get_cert_status(SSL *s); 182 static int ssl3_get_server_done(SSL *s); 183 static int ssl3_send_client_verify(SSL *s); 184 static int ssl3_send_client_certificate(SSL *s); 185 static int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey); 186 static int ssl3_send_client_key_exchange(SSL *s); 187 static int ssl3_get_server_key_exchange(SSL *s); 188 static int ssl3_get_server_certificate(SSL *s); 189 static int ssl3_check_cert_and_algorithm(SSL *s); 190 static int ssl3_check_finished(SSL *s); 191 static int ssl3_send_client_change_cipher_spec(SSL *s); 192 static int ssl3_send_client_finished(SSL *s); 193 static int ssl3_get_server_finished(SSL *s); 194 195 int 196 ssl3_connect(SSL *s) 197 { 198 int new_state, state, skip = 0; 199 int ret = -1; 200 201 ERR_clear_error(); 202 errno = 0; 203 204 s->in_handshake++; 205 if (!SSL_in_init(s) || SSL_in_before(s)) 206 SSL_clear(s); 207 208 for (;;) { 209 state = s->s3->hs.state; 210 211 switch (s->s3->hs.state) { 212 case SSL_ST_RENEGOTIATE: 213 s->renegotiate = 1; 214 s->s3->hs.state = SSL_ST_CONNECT; 215 s->ctx->stats.sess_connect_renegotiate++; 216 /* break */ 217 case SSL_ST_BEFORE: 218 case SSL_ST_CONNECT: 219 case SSL_ST_BEFORE|SSL_ST_CONNECT: 220 case SSL_ST_OK|SSL_ST_CONNECT: 221 222 s->server = 0; 223 224 ssl_info_callback(s, SSL_CB_HANDSHAKE_START, 1); 225 226 if (!ssl_legacy_stack_version(s, s->version)) { 227 SSLerror(s, ERR_R_INTERNAL_ERROR); 228 ret = -1; 229 goto end; 230 } 231 232 if (!ssl_supported_tls_version_range(s, 233 &s->s3->hs.our_min_tls_version, 234 &s->s3->hs.our_max_tls_version)) { 235 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 236 ret = -1; 237 goto end; 238 } 239 240 if (!ssl_security_version(s, 241 s->s3->hs.our_min_tls_version)) { 242 SSLerror(s, SSL_R_VERSION_TOO_LOW); 243 ret = -1; 244 goto end; 245 } 246 247 if (!ssl3_setup_init_buffer(s)) { 248 ret = -1; 249 goto end; 250 } 251 if (!ssl3_setup_buffers(s)) { 252 ret = -1; 253 goto end; 254 } 255 if (!ssl_init_wbio_buffer(s, 0)) { 256 ret = -1; 257 goto end; 258 } 259 260 /* don't push the buffering BIO quite yet */ 261 262 if (!tls1_transcript_init(s)) { 263 ret = -1; 264 goto end; 265 } 266 267 s->s3->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 268 s->ctx->stats.sess_connect++; 269 s->init_num = 0; 270 271 if (SSL_is_dtls(s)) { 272 /* mark client_random uninitialized */ 273 memset(s->s3->client_random, 0, 274 sizeof(s->s3->client_random)); 275 s->d1->send_cookie = 0; 276 s->hit = 0; 277 } 278 break; 279 280 case SSL3_ST_CW_CLNT_HELLO_A: 281 case SSL3_ST_CW_CLNT_HELLO_B: 282 s->shutdown = 0; 283 284 if (SSL_is_dtls(s)) { 285 /* every DTLS ClientHello resets Finished MAC */ 286 tls1_transcript_reset(s); 287 288 dtls1_start_timer(s); 289 } 290 291 ret = ssl3_send_client_hello(s); 292 if (ret <= 0) 293 goto end; 294 295 if (SSL_is_dtls(s) && s->d1->send_cookie) { 296 s->s3->hs.state = SSL3_ST_CW_FLUSH; 297 s->s3->hs.tls12.next_state = SSL3_ST_CR_SRVR_HELLO_A; 298 } else 299 s->s3->hs.state = SSL3_ST_CR_SRVR_HELLO_A; 300 301 s->init_num = 0; 302 303 /* turn on buffering for the next lot of output */ 304 if (s->bbio != s->wbio) 305 s->wbio = BIO_push(s->bbio, s->wbio); 306 307 break; 308 309 case SSL3_ST_CR_SRVR_HELLO_A: 310 case SSL3_ST_CR_SRVR_HELLO_B: 311 ret = ssl3_get_server_hello(s); 312 if (ret <= 0) 313 goto end; 314 315 if (s->hit) { 316 s->s3->hs.state = SSL3_ST_CR_FINISHED_A; 317 if (!SSL_is_dtls(s)) { 318 if (s->tlsext_ticket_expected) { 319 /* receive renewed session ticket */ 320 s->s3->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 321 } 322 323 /* No client certificate verification. */ 324 tls1_transcript_free(s); 325 } 326 } else if (SSL_is_dtls(s)) { 327 s->s3->hs.state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 328 } else { 329 s->s3->hs.state = SSL3_ST_CR_CERT_A; 330 } 331 s->init_num = 0; 332 break; 333 334 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 335 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 336 ret = ssl3_get_dtls_hello_verify(s); 337 if (ret <= 0) 338 goto end; 339 dtls1_stop_timer(s); 340 if (s->d1->send_cookie) /* start again, with a cookie */ 341 s->s3->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 342 else 343 s->s3->hs.state = SSL3_ST_CR_CERT_A; 344 s->init_num = 0; 345 break; 346 347 case SSL3_ST_CR_CERT_A: 348 case SSL3_ST_CR_CERT_B: 349 ret = ssl3_check_finished(s); 350 if (ret <= 0) 351 goto end; 352 if (ret == 2) { 353 s->hit = 1; 354 if (s->tlsext_ticket_expected) 355 s->s3->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 356 else 357 s->s3->hs.state = SSL3_ST_CR_FINISHED_A; 358 s->init_num = 0; 359 break; 360 } 361 /* Check if it is anon DH/ECDH. */ 362 if (!(s->s3->hs.cipher->algorithm_auth & 363 SSL_aNULL)) { 364 ret = ssl3_get_server_certificate(s); 365 if (ret <= 0) 366 goto end; 367 if (s->tlsext_status_expected) 368 s->s3->hs.state = SSL3_ST_CR_CERT_STATUS_A; 369 else 370 s->s3->hs.state = SSL3_ST_CR_KEY_EXCH_A; 371 } else { 372 skip = 1; 373 s->s3->hs.state = SSL3_ST_CR_KEY_EXCH_A; 374 } 375 s->init_num = 0; 376 break; 377 378 case SSL3_ST_CR_KEY_EXCH_A: 379 case SSL3_ST_CR_KEY_EXCH_B: 380 ret = ssl3_get_server_key_exchange(s); 381 if (ret <= 0) 382 goto end; 383 s->s3->hs.state = SSL3_ST_CR_CERT_REQ_A; 384 s->init_num = 0; 385 386 /* 387 * At this point we check that we have the 388 * required stuff from the server. 389 */ 390 if (!ssl3_check_cert_and_algorithm(s)) { 391 ret = -1; 392 goto end; 393 } 394 break; 395 396 case SSL3_ST_CR_CERT_REQ_A: 397 case SSL3_ST_CR_CERT_REQ_B: 398 ret = ssl3_get_certificate_request(s); 399 if (ret <= 0) 400 goto end; 401 s->s3->hs.state = SSL3_ST_CR_SRVR_DONE_A; 402 s->init_num = 0; 403 break; 404 405 case SSL3_ST_CR_SRVR_DONE_A: 406 case SSL3_ST_CR_SRVR_DONE_B: 407 ret = ssl3_get_server_done(s); 408 if (ret <= 0) 409 goto end; 410 if (SSL_is_dtls(s)) 411 dtls1_stop_timer(s); 412 if (s->s3->hs.tls12.cert_request) 413 s->s3->hs.state = SSL3_ST_CW_CERT_A; 414 else 415 s->s3->hs.state = SSL3_ST_CW_KEY_EXCH_A; 416 s->init_num = 0; 417 418 break; 419 420 case SSL3_ST_CW_CERT_A: 421 case SSL3_ST_CW_CERT_B: 422 case SSL3_ST_CW_CERT_C: 423 case SSL3_ST_CW_CERT_D: 424 if (SSL_is_dtls(s)) 425 dtls1_start_timer(s); 426 ret = ssl3_send_client_certificate(s); 427 if (ret <= 0) 428 goto end; 429 s->s3->hs.state = SSL3_ST_CW_KEY_EXCH_A; 430 s->init_num = 0; 431 break; 432 433 case SSL3_ST_CW_KEY_EXCH_A: 434 case SSL3_ST_CW_KEY_EXCH_B: 435 if (SSL_is_dtls(s)) 436 dtls1_start_timer(s); 437 ret = ssl3_send_client_key_exchange(s); 438 if (ret <= 0) 439 goto end; 440 /* 441 * EAY EAY EAY need to check for DH fix cert 442 * sent back 443 */ 444 /* 445 * For TLS, cert_req is set to 2, so a cert chain 446 * of nothing is sent, but no verify packet is sent 447 */ 448 /* 449 * XXX: For now, we do not support client 450 * authentication in ECDH cipher suites with 451 * ECDH (rather than ECDSA) certificates. 452 * We need to skip the certificate verify 453 * message when client's ECDH public key is sent 454 * inside the client certificate. 455 */ 456 if (s->s3->hs.tls12.cert_request == 1) { 457 s->s3->hs.state = SSL3_ST_CW_CERT_VRFY_A; 458 } else { 459 s->s3->hs.state = SSL3_ST_CW_CHANGE_A; 460 s->s3->change_cipher_spec = 0; 461 } 462 if (!SSL_is_dtls(s)) { 463 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 464 s->s3->hs.state = SSL3_ST_CW_CHANGE_A; 465 s->s3->change_cipher_spec = 0; 466 } 467 } 468 469 s->init_num = 0; 470 break; 471 472 case SSL3_ST_CW_CERT_VRFY_A: 473 case SSL3_ST_CW_CERT_VRFY_B: 474 if (SSL_is_dtls(s)) 475 dtls1_start_timer(s); 476 ret = ssl3_send_client_verify(s); 477 if (ret <= 0) 478 goto end; 479 s->s3->hs.state = SSL3_ST_CW_CHANGE_A; 480 s->init_num = 0; 481 s->s3->change_cipher_spec = 0; 482 break; 483 484 case SSL3_ST_CW_CHANGE_A: 485 case SSL3_ST_CW_CHANGE_B: 486 if (SSL_is_dtls(s) && !s->hit) 487 dtls1_start_timer(s); 488 ret = ssl3_send_client_change_cipher_spec(s); 489 if (ret <= 0) 490 goto end; 491 492 s->s3->hs.state = SSL3_ST_CW_FINISHED_A; 493 s->init_num = 0; 494 s->session->cipher = s->s3->hs.cipher; 495 496 if (!tls1_setup_key_block(s)) { 497 ret = -1; 498 goto end; 499 } 500 if (!tls1_change_write_cipher_state(s)) { 501 ret = -1; 502 goto end; 503 } 504 break; 505 506 case SSL3_ST_CW_FINISHED_A: 507 case SSL3_ST_CW_FINISHED_B: 508 if (SSL_is_dtls(s) && !s->hit) 509 dtls1_start_timer(s); 510 ret = ssl3_send_client_finished(s); 511 if (ret <= 0) 512 goto end; 513 if (!SSL_is_dtls(s)) 514 s->s3->flags |= SSL3_FLAGS_CCS_OK; 515 s->s3->hs.state = SSL3_ST_CW_FLUSH; 516 517 /* clear flags */ 518 if (s->hit) { 519 s->s3->hs.tls12.next_state = SSL_ST_OK; 520 } else { 521 /* Allow NewSessionTicket if ticket expected */ 522 if (s->tlsext_ticket_expected) 523 s->s3->hs.tls12.next_state = 524 SSL3_ST_CR_SESSION_TICKET_A; 525 else 526 s->s3->hs.tls12.next_state = 527 SSL3_ST_CR_FINISHED_A; 528 } 529 s->init_num = 0; 530 break; 531 532 case SSL3_ST_CR_SESSION_TICKET_A: 533 case SSL3_ST_CR_SESSION_TICKET_B: 534 ret = ssl3_get_new_session_ticket(s); 535 if (ret <= 0) 536 goto end; 537 s->s3->hs.state = SSL3_ST_CR_FINISHED_A; 538 s->init_num = 0; 539 break; 540 541 case SSL3_ST_CR_CERT_STATUS_A: 542 case SSL3_ST_CR_CERT_STATUS_B: 543 ret = ssl3_get_cert_status(s); 544 if (ret <= 0) 545 goto end; 546 s->s3->hs.state = SSL3_ST_CR_KEY_EXCH_A; 547 s->init_num = 0; 548 break; 549 550 case SSL3_ST_CR_FINISHED_A: 551 case SSL3_ST_CR_FINISHED_B: 552 if (SSL_is_dtls(s)) 553 s->d1->change_cipher_spec_ok = 1; 554 else 555 s->s3->flags |= SSL3_FLAGS_CCS_OK; 556 ret = ssl3_get_server_finished(s); 557 if (ret <= 0) 558 goto end; 559 if (SSL_is_dtls(s)) 560 dtls1_stop_timer(s); 561 562 if (s->hit) 563 s->s3->hs.state = SSL3_ST_CW_CHANGE_A; 564 else 565 s->s3->hs.state = SSL_ST_OK; 566 s->init_num = 0; 567 break; 568 569 case SSL3_ST_CW_FLUSH: 570 s->rwstate = SSL_WRITING; 571 if (BIO_flush(s->wbio) <= 0) { 572 if (SSL_is_dtls(s)) { 573 /* If the write error was fatal, stop trying */ 574 if (!BIO_should_retry(s->wbio)) { 575 s->rwstate = SSL_NOTHING; 576 s->s3->hs.state = s->s3->hs.tls12.next_state; 577 } 578 } 579 ret = -1; 580 goto end; 581 } 582 s->rwstate = SSL_NOTHING; 583 s->s3->hs.state = s->s3->hs.tls12.next_state; 584 break; 585 586 case SSL_ST_OK: 587 /* clean a few things up */ 588 tls1_cleanup_key_block(s); 589 590 if (s->s3->handshake_transcript != NULL) { 591 SSLerror(s, ERR_R_INTERNAL_ERROR); 592 ret = -1; 593 goto end; 594 } 595 596 if (!SSL_is_dtls(s)) 597 ssl3_release_init_buffer(s); 598 599 ssl_free_wbio_buffer(s); 600 601 s->init_num = 0; 602 s->renegotiate = 0; 603 s->new_session = 0; 604 605 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 606 if (s->hit) 607 s->ctx->stats.sess_hit++; 608 609 ret = 1; 610 /* s->server=0; */ 611 s->handshake_func = ssl3_connect; 612 s->ctx->stats.sess_connect_good++; 613 614 ssl_info_callback(s, SSL_CB_HANDSHAKE_DONE, 1); 615 616 if (SSL_is_dtls(s)) { 617 /* done with handshaking */ 618 s->d1->handshake_read_seq = 0; 619 s->d1->next_handshake_write_seq = 0; 620 } 621 622 goto end; 623 /* break; */ 624 625 default: 626 SSLerror(s, SSL_R_UNKNOWN_STATE); 627 ret = -1; 628 goto end; 629 /* break; */ 630 } 631 632 /* did we do anything */ 633 if (!s->s3->hs.tls12.reuse_message && !skip) { 634 if (s->s3->hs.state != state) { 635 new_state = s->s3->hs.state; 636 s->s3->hs.state = state; 637 ssl_info_callback(s, SSL_CB_CONNECT_LOOP, 1); 638 s->s3->hs.state = new_state; 639 } 640 } 641 skip = 0; 642 } 643 644 end: 645 s->in_handshake--; 646 ssl_info_callback(s, SSL_CB_CONNECT_EXIT, ret); 647 648 return (ret); 649 } 650 651 static int 652 ssl3_send_client_hello(SSL *s) 653 { 654 CBB cbb, client_hello, session_id, cookie, cipher_suites; 655 CBB compression_methods; 656 uint16_t max_version; 657 size_t sl; 658 659 memset(&cbb, 0, sizeof(cbb)); 660 661 if (s->s3->hs.state == SSL3_ST_CW_CLNT_HELLO_A) { 662 SSL_SESSION *sess = s->session; 663 664 if (!ssl_max_supported_version(s, &max_version)) { 665 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 666 return (-1); 667 } 668 s->version = max_version; 669 670 if (sess == NULL || sess->ssl_version != s->version || 671 (sess->session_id_length == 0 && sess->tlsext_tick == NULL) || 672 sess->not_resumable) { 673 if (!ssl_get_new_session(s, 0)) 674 goto err; 675 } 676 /* else use the pre-loaded session */ 677 678 /* 679 * If a DTLS ClientHello message is being resent after a 680 * HelloVerifyRequest, we must retain the original client 681 * random value. 682 */ 683 if (!SSL_is_dtls(s) || s->d1->send_cookie == 0) 684 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE); 685 686 if (!ssl3_handshake_msg_start(s, &cbb, &client_hello, 687 SSL3_MT_CLIENT_HELLO)) 688 goto err; 689 690 if (!CBB_add_u16(&client_hello, s->version)) 691 goto err; 692 693 /* Random stuff */ 694 if (!CBB_add_bytes(&client_hello, s->s3->client_random, 695 sizeof(s->s3->client_random))) 696 goto err; 697 698 /* Session ID */ 699 if (!CBB_add_u8_length_prefixed(&client_hello, &session_id)) 700 goto err; 701 if (!s->new_session && 702 s->session->session_id_length > 0) { 703 sl = s->session->session_id_length; 704 if (sl > sizeof(s->session->session_id)) { 705 SSLerror(s, ERR_R_INTERNAL_ERROR); 706 goto err; 707 } 708 if (!CBB_add_bytes(&session_id, 709 s->session->session_id, sl)) 710 goto err; 711 } 712 713 /* DTLS Cookie. */ 714 if (SSL_is_dtls(s)) { 715 if (s->d1->cookie_len > sizeof(s->d1->cookie)) { 716 SSLerror(s, ERR_R_INTERNAL_ERROR); 717 goto err; 718 } 719 if (!CBB_add_u8_length_prefixed(&client_hello, &cookie)) 720 goto err; 721 if (!CBB_add_bytes(&cookie, s->d1->cookie, 722 s->d1->cookie_len)) 723 goto err; 724 } 725 726 /* Ciphers supported */ 727 if (!CBB_add_u16_length_prefixed(&client_hello, &cipher_suites)) 728 return 0; 729 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), 730 &cipher_suites)) { 731 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE); 732 goto err; 733 } 734 735 /* Add in compression methods (null) */ 736 if (!CBB_add_u8_length_prefixed(&client_hello, 737 &compression_methods)) 738 goto err; 739 if (!CBB_add_u8(&compression_methods, 0)) 740 goto err; 741 742 /* TLS extensions */ 743 if (!tlsext_client_build(s, SSL_TLSEXT_MSG_CH, &client_hello)) { 744 SSLerror(s, ERR_R_INTERNAL_ERROR); 745 goto err; 746 } 747 748 if (!ssl3_handshake_msg_finish(s, &cbb)) 749 goto err; 750 751 s->s3->hs.state = SSL3_ST_CW_CLNT_HELLO_B; 752 } 753 754 /* SSL3_ST_CW_CLNT_HELLO_B */ 755 return (ssl3_handshake_write(s)); 756 757 err: 758 CBB_cleanup(&cbb); 759 760 return (-1); 761 } 762 763 static int 764 ssl3_get_dtls_hello_verify(SSL *s) 765 { 766 CBS hello_verify_request, cookie; 767 size_t cookie_len; 768 uint16_t ssl_version; 769 int al, ret; 770 771 if ((ret = ssl3_get_message(s, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 772 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, s->max_cert_list)) <= 0) 773 return ret; 774 775 if (s->s3->hs.tls12.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 776 s->d1->send_cookie = 0; 777 s->s3->hs.tls12.reuse_message = 1; 778 return (1); 779 } 780 781 if (s->init_num < 0) 782 goto decode_err; 783 784 CBS_init(&hello_verify_request, s->init_msg, 785 s->init_num); 786 787 if (!CBS_get_u16(&hello_verify_request, &ssl_version)) 788 goto decode_err; 789 if (!CBS_get_u8_length_prefixed(&hello_verify_request, &cookie)) 790 goto decode_err; 791 if (CBS_len(&hello_verify_request) != 0) 792 goto decode_err; 793 794 /* 795 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should always 796 * contain DTLSv1.0 the version that is going to be negotiated. 797 * Tolerate DTLSv1.2 just in case. 798 */ 799 if (ssl_version != DTLS1_VERSION && ssl_version != DTLS1_2_VERSION) { 800 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 801 s->version = (s->version & 0xff00) | (ssl_version & 0xff); 802 al = SSL_AD_PROTOCOL_VERSION; 803 goto fatal_err; 804 } 805 806 if (!CBS_write_bytes(&cookie, s->d1->cookie, 807 sizeof(s->d1->cookie), &cookie_len)) { 808 s->d1->cookie_len = 0; 809 al = SSL_AD_ILLEGAL_PARAMETER; 810 goto fatal_err; 811 } 812 s->d1->cookie_len = cookie_len; 813 s->d1->send_cookie = 1; 814 815 return 1; 816 817 decode_err: 818 al = SSL_AD_DECODE_ERROR; 819 fatal_err: 820 ssl3_send_alert(s, SSL3_AL_FATAL, al); 821 return -1; 822 } 823 824 static int 825 ssl3_get_server_hello(SSL *s) 826 { 827 CBS cbs, server_random, session_id; 828 uint16_t server_version, cipher_suite; 829 uint8_t compression_method; 830 const SSL_CIPHER *cipher; 831 const SSL_METHOD *method; 832 unsigned long alg_k; 833 int al, ret; 834 835 s->first_packet = 1; 836 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 837 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000 /* ?? */)) <= 0) 838 return ret; 839 s->first_packet = 0; 840 841 if (s->init_num < 0) 842 goto decode_err; 843 844 CBS_init(&cbs, s->init_msg, s->init_num); 845 846 if (SSL_is_dtls(s)) { 847 if (s->s3->hs.tls12.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 848 if (s->d1->send_cookie == 0) { 849 s->s3->hs.tls12.reuse_message = 1; 850 return (1); 851 } else { 852 /* Already sent a cookie. */ 853 al = SSL_AD_UNEXPECTED_MESSAGE; 854 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 855 goto fatal_err; 856 } 857 } 858 } 859 860 if (s->s3->hs.tls12.message_type != SSL3_MT_SERVER_HELLO) { 861 al = SSL_AD_UNEXPECTED_MESSAGE; 862 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 863 goto fatal_err; 864 } 865 866 if (!CBS_get_u16(&cbs, &server_version)) 867 goto decode_err; 868 869 if (!ssl_check_version_from_server(s, server_version)) { 870 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 871 s->version = (s->version & 0xff00) | (server_version & 0xff); 872 al = SSL_AD_PROTOCOL_VERSION; 873 goto fatal_err; 874 } 875 s->s3->hs.peer_legacy_version = server_version; 876 s->version = server_version; 877 878 s->s3->hs.negotiated_tls_version = ssl_tls_version(server_version); 879 if (s->s3->hs.negotiated_tls_version == 0) { 880 SSLerror(s, ERR_R_INTERNAL_ERROR); 881 goto err; 882 } 883 884 if ((method = ssl_get_method(server_version)) == NULL) { 885 SSLerror(s, ERR_R_INTERNAL_ERROR); 886 goto err; 887 } 888 s->method = method; 889 890 /* Server random. */ 891 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 892 goto decode_err; 893 if (!CBS_write_bytes(&server_random, s->s3->server_random, 894 sizeof(s->s3->server_random), NULL)) 895 goto err; 896 897 if (s->s3->hs.our_max_tls_version >= TLS1_2_VERSION && 898 s->s3->hs.negotiated_tls_version < s->s3->hs.our_max_tls_version) { 899 /* 900 * RFC 8446 section 4.1.3. We must not downgrade if the server 901 * random value contains the TLS 1.2 or TLS 1.1 magical value. 902 */ 903 if (!CBS_skip(&server_random, 904 CBS_len(&server_random) - sizeof(tls13_downgrade_12))) 905 goto err; 906 if (s->s3->hs.negotiated_tls_version == TLS1_2_VERSION && 907 CBS_mem_equal(&server_random, tls13_downgrade_12, 908 sizeof(tls13_downgrade_12))) { 909 al = SSL_AD_ILLEGAL_PARAMETER; 910 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 911 goto fatal_err; 912 } 913 if (CBS_mem_equal(&server_random, tls13_downgrade_11, 914 sizeof(tls13_downgrade_11))) { 915 al = SSL_AD_ILLEGAL_PARAMETER; 916 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 917 goto fatal_err; 918 } 919 } 920 921 /* Session ID. */ 922 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 923 goto decode_err; 924 925 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 926 al = SSL_AD_ILLEGAL_PARAMETER; 927 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 928 goto fatal_err; 929 } 930 931 /* Cipher suite. */ 932 if (!CBS_get_u16(&cbs, &cipher_suite)) 933 goto decode_err; 934 935 /* 936 * Check if we want to resume the session based on external 937 * pre-shared secret. 938 */ 939 if (s->tls_session_secret_cb != NULL) { 940 SSL_CIPHER *pref_cipher = NULL; 941 int master_key_length = sizeof(s->session->master_key); 942 943 if (!s->tls_session_secret_cb(s, 944 s->session->master_key, &master_key_length, NULL, 945 &pref_cipher, s->tls_session_secret_cb_arg)) { 946 SSLerror(s, ERR_R_INTERNAL_ERROR); 947 goto err; 948 } 949 if (master_key_length <= 0) { 950 SSLerror(s, ERR_R_INTERNAL_ERROR); 951 goto err; 952 } 953 s->session->master_key_length = master_key_length; 954 955 if ((s->session->cipher = pref_cipher) == NULL) 956 s->session->cipher = 957 ssl3_get_cipher_by_value(cipher_suite); 958 s->s3->flags |= SSL3_FLAGS_CCS_OK; 959 } 960 961 if (s->session->session_id_length != 0 && 962 CBS_mem_equal(&session_id, s->session->session_id, 963 s->session->session_id_length)) { 964 if (s->sid_ctx_length != s->session->sid_ctx_length || 965 timingsafe_memcmp(s->session->sid_ctx, 966 s->sid_ctx, s->sid_ctx_length) != 0) { 967 /* actually a client application bug */ 968 al = SSL_AD_ILLEGAL_PARAMETER; 969 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 970 goto fatal_err; 971 } 972 s->s3->flags |= SSL3_FLAGS_CCS_OK; 973 s->hit = 1; 974 } else { 975 /* a miss or crap from the other end */ 976 977 /* If we were trying for session-id reuse, make a new 978 * SSL_SESSION so we don't stuff up other people */ 979 s->hit = 0; 980 if (s->session->session_id_length > 0) { 981 if (!ssl_get_new_session(s, 0)) { 982 al = SSL_AD_INTERNAL_ERROR; 983 goto fatal_err; 984 } 985 } 986 987 /* 988 * XXX - improve the handling for the case where there is a 989 * zero length session identifier. 990 */ 991 if (!CBS_write_bytes(&session_id, s->session->session_id, 992 sizeof(s->session->session_id), 993 &s->session->session_id_length)) 994 goto err; 995 996 s->session->ssl_version = s->version; 997 } 998 999 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 1000 al = SSL_AD_ILLEGAL_PARAMETER; 1001 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 1002 goto fatal_err; 1003 } 1004 1005 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 1006 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 1007 s->s3->hs.negotiated_tls_version < TLS1_2_VERSION) { 1008 al = SSL_AD_ILLEGAL_PARAMETER; 1009 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1010 goto fatal_err; 1011 } 1012 1013 if (!ssl_cipher_in_list(SSL_get_ciphers(s), cipher)) { 1014 /* we did not say we would use this cipher */ 1015 al = SSL_AD_ILLEGAL_PARAMETER; 1016 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1017 goto fatal_err; 1018 } 1019 1020 /* 1021 * Depending on the session caching (internal/external), the cipher 1022 * and/or cipher_id values may not be set. Make sure that 1023 * cipher_id is set and use it for comparison. 1024 */ 1025 if (s->session->cipher) 1026 s->session->cipher_id = s->session->cipher->id; 1027 if (s->hit && (s->session->cipher_id != cipher->id)) { 1028 al = SSL_AD_ILLEGAL_PARAMETER; 1029 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1030 goto fatal_err; 1031 } 1032 s->s3->hs.cipher = cipher; 1033 1034 if (!tls1_transcript_hash_init(s)) 1035 goto err; 1036 1037 /* 1038 * Don't digest cached records if no sigalgs: we may need them for 1039 * client authentication. 1040 */ 1041 alg_k = s->s3->hs.cipher->algorithm_mkey; 1042 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST))) 1043 tls1_transcript_free(s); 1044 1045 if (!CBS_get_u8(&cbs, &compression_method)) 1046 goto decode_err; 1047 1048 if (compression_method != 0) { 1049 al = SSL_AD_ILLEGAL_PARAMETER; 1050 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1051 goto fatal_err; 1052 } 1053 1054 if (!tlsext_client_parse(s, SSL_TLSEXT_MSG_SH, &cbs, &al)) { 1055 SSLerror(s, SSL_R_PARSE_TLSEXT); 1056 goto fatal_err; 1057 } 1058 1059 if (CBS_len(&cbs) != 0) 1060 goto decode_err; 1061 1062 /* 1063 * Determine if we need to see RI. Strictly speaking if we want to 1064 * avoid an attack we should *always* see RI even on initial server 1065 * hello because the client doesn't see any renegotiation during an 1066 * attack. However this would mean we could not connect to any server 1067 * which doesn't support RI so for the immediate future tolerate RI 1068 * absence on initial connect only. 1069 */ 1070 if (!s->s3->renegotiate_seen && 1071 !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1072 al = SSL_AD_HANDSHAKE_FAILURE; 1073 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1074 goto fatal_err; 1075 } 1076 1077 if (ssl_check_serverhello_tlsext(s) <= 0) { 1078 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1079 goto err; 1080 } 1081 1082 return (1); 1083 1084 decode_err: 1085 /* wrong packet length */ 1086 al = SSL_AD_DECODE_ERROR; 1087 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1088 fatal_err: 1089 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1090 err: 1091 return (-1); 1092 } 1093 1094 static int 1095 ssl3_get_server_certificate(SSL *s) 1096 { 1097 CBS cbs, cert_list, cert_data; 1098 STACK_OF(X509) *certs = NULL; 1099 X509 *cert = NULL; 1100 const uint8_t *p; 1101 int al, ret; 1102 1103 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1104 SSL3_ST_CR_CERT_B, -1, s->max_cert_list)) <= 0) 1105 return ret; 1106 1107 ret = -1; 1108 1109 if (s->s3->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1110 s->s3->hs.tls12.reuse_message = 1; 1111 return (1); 1112 } 1113 1114 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE) { 1115 al = SSL_AD_UNEXPECTED_MESSAGE; 1116 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1117 goto fatal_err; 1118 } 1119 1120 if ((certs = sk_X509_new_null()) == NULL) { 1121 SSLerror(s, ERR_R_MALLOC_FAILURE); 1122 goto err; 1123 } 1124 1125 if (s->init_num < 0) 1126 goto decode_err; 1127 1128 CBS_init(&cbs, s->init_msg, s->init_num); 1129 1130 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list)) 1131 goto decode_err; 1132 if (CBS_len(&cbs) != 0) 1133 goto decode_err; 1134 1135 while (CBS_len(&cert_list) > 0) { 1136 if (!CBS_get_u24_length_prefixed(&cert_list, &cert_data)) 1137 goto decode_err; 1138 p = CBS_data(&cert_data); 1139 if ((cert = d2i_X509(NULL, &p, CBS_len(&cert_data))) == NULL) { 1140 al = SSL_AD_BAD_CERTIFICATE; 1141 SSLerror(s, ERR_R_ASN1_LIB); 1142 goto fatal_err; 1143 } 1144 if (p != CBS_data(&cert_data) + CBS_len(&cert_data)) 1145 goto decode_err; 1146 if (!sk_X509_push(certs, cert)) { 1147 SSLerror(s, ERR_R_MALLOC_FAILURE); 1148 goto err; 1149 } 1150 cert = NULL; 1151 } 1152 1153 /* A server must always provide a non-empty certificate list. */ 1154 if (sk_X509_num(certs) < 1) { 1155 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 1156 goto decode_err; 1157 } 1158 1159 if (ssl_verify_cert_chain(s, certs) <= 0 && 1160 s->verify_mode != SSL_VERIFY_NONE) { 1161 al = ssl_verify_alarm_type(s->verify_result); 1162 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1163 goto fatal_err; 1164 } 1165 s->session->verify_result = s->verify_result; 1166 ERR_clear_error(); 1167 1168 if (!tls_process_peer_certs(s, certs)) 1169 goto err; 1170 1171 ret = 1; 1172 1173 if (0) { 1174 decode_err: 1175 /* wrong packet length */ 1176 al = SSL_AD_DECODE_ERROR; 1177 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1178 fatal_err: 1179 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1180 } 1181 err: 1182 sk_X509_pop_free(certs, X509_free); 1183 X509_free(cert); 1184 1185 return (ret); 1186 } 1187 1188 static int 1189 ssl3_get_server_kex_dhe(SSL *s, CBS *cbs) 1190 { 1191 int decode_error, invalid_params, invalid_key; 1192 int nid = NID_dhKeyAgreement; 1193 1194 tls_key_share_free(s->s3->hs.key_share); 1195 if ((s->s3->hs.key_share = tls_key_share_new_nid(nid)) == NULL) 1196 goto err; 1197 1198 if (!tls_key_share_peer_params(s->s3->hs.key_share, cbs, 1199 &decode_error, &invalid_params)) { 1200 if (decode_error) { 1201 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1202 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1203 } 1204 goto err; 1205 } 1206 if (!tls_key_share_peer_public(s->s3->hs.key_share, cbs, 1207 &decode_error, &invalid_key)) { 1208 if (decode_error) { 1209 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1210 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1211 } 1212 goto err; 1213 } 1214 1215 if (invalid_params) { 1216 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1217 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1218 goto err; 1219 } 1220 if (invalid_key) { 1221 SSLerror(s, SSL_R_BAD_DH_PUB_KEY_LENGTH); 1222 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1223 goto err; 1224 } 1225 1226 if (!tls_key_share_peer_security(s, s->s3->hs.key_share)) { 1227 SSLerror(s, SSL_R_DH_KEY_TOO_SMALL); 1228 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1229 return 0; 1230 } 1231 1232 return 1; 1233 1234 err: 1235 return 0; 1236 } 1237 1238 static int 1239 ssl3_get_server_kex_ecdhe(SSL *s, CBS *cbs) 1240 { 1241 uint8_t curve_type; 1242 uint16_t group_id; 1243 int decode_error; 1244 CBS public; 1245 1246 if (!CBS_get_u8(cbs, &curve_type)) 1247 goto decode_err; 1248 if (!CBS_get_u16(cbs, &group_id)) 1249 goto decode_err; 1250 1251 /* Only named curves are supported. */ 1252 if (curve_type != NAMED_CURVE_TYPE) { 1253 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1254 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1255 goto err; 1256 } 1257 1258 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1259 goto decode_err; 1260 1261 /* 1262 * Check that the group is one of our preferences - if it is not, 1263 * the server has sent us an invalid group. 1264 */ 1265 if (!tls1_check_group(s, group_id)) { 1266 SSLerror(s, SSL_R_WRONG_CURVE); 1267 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1268 goto err; 1269 } 1270 1271 tls_key_share_free(s->s3->hs.key_share); 1272 if ((s->s3->hs.key_share = tls_key_share_new(group_id)) == NULL) 1273 goto err; 1274 1275 if (!tls_key_share_peer_public(s->s3->hs.key_share, &public, 1276 &decode_error, NULL)) { 1277 if (decode_error) 1278 goto decode_err; 1279 goto err; 1280 } 1281 1282 return 1; 1283 1284 decode_err: 1285 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1286 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1287 err: 1288 return 0; 1289 } 1290 1291 static int 1292 ssl3_get_server_key_exchange(SSL *s) 1293 { 1294 CBB cbb; 1295 CBS cbs, params, signature; 1296 EVP_MD_CTX *md_ctx; 1297 unsigned char *signed_params = NULL; 1298 size_t signed_params_len; 1299 size_t params_len; 1300 long alg_k, alg_a; 1301 int al, ret; 1302 1303 memset(&cbb, 0, sizeof(cbb)); 1304 1305 alg_k = s->s3->hs.cipher->algorithm_mkey; 1306 alg_a = s->s3->hs.cipher->algorithm_auth; 1307 1308 /* 1309 * Use same message size as in ssl3_get_certificate_request() 1310 * as ServerKeyExchange message may be skipped. 1311 */ 1312 if ((ret = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1313 SSL3_ST_CR_KEY_EXCH_B, -1, s->max_cert_list)) <= 0) 1314 return ret; 1315 1316 if ((md_ctx = EVP_MD_CTX_new()) == NULL) 1317 goto err; 1318 1319 if (s->init_num < 0) 1320 goto err; 1321 1322 CBS_init(&cbs, s->init_msg, s->init_num); 1323 1324 if (s->s3->hs.tls12.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1325 /* 1326 * Do not skip server key exchange if this cipher suite uses 1327 * ephemeral keys. 1328 */ 1329 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1330 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1331 al = SSL_AD_UNEXPECTED_MESSAGE; 1332 goto fatal_err; 1333 } 1334 1335 s->s3->hs.tls12.reuse_message = 1; 1336 EVP_MD_CTX_free(md_ctx); 1337 return (1); 1338 } 1339 1340 if (!CBB_init(&cbb, 0)) 1341 goto err; 1342 if (!CBB_add_bytes(&cbb, s->s3->client_random, SSL3_RANDOM_SIZE)) 1343 goto err; 1344 if (!CBB_add_bytes(&cbb, s->s3->server_random, SSL3_RANDOM_SIZE)) 1345 goto err; 1346 1347 CBS_dup(&cbs, ¶ms); 1348 1349 if (alg_k & SSL_kDHE) { 1350 if (!ssl3_get_server_kex_dhe(s, &cbs)) 1351 goto err; 1352 } else if (alg_k & SSL_kECDHE) { 1353 if (!ssl3_get_server_kex_ecdhe(s, &cbs)) 1354 goto err; 1355 } else if (alg_k != 0) { 1356 al = SSL_AD_UNEXPECTED_MESSAGE; 1357 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1358 goto fatal_err; 1359 } 1360 1361 if ((params_len = CBS_offset(&cbs)) > CBS_len(¶ms)) 1362 goto err; 1363 if (!CBB_add_bytes(&cbb, CBS_data(¶ms), params_len)) 1364 goto err; 1365 if (!CBB_finish(&cbb, &signed_params, &signed_params_len)) 1366 goto err; 1367 1368 /* if it was signed, check the signature */ 1369 if ((alg_a & SSL_aNULL) == 0) { 1370 uint16_t sigalg_value = SIGALG_NONE; 1371 const struct ssl_sigalg *sigalg; 1372 EVP_PKEY_CTX *pctx; 1373 EVP_PKEY *pkey = NULL; 1374 1375 if ((alg_a & SSL_aRSA) != 0 && 1376 s->session->peer_cert_type == SSL_PKEY_RSA) { 1377 pkey = X509_get0_pubkey(s->session->peer_cert); 1378 } else if ((alg_a & SSL_aECDSA) != 0 && 1379 s->session->peer_cert_type == SSL_PKEY_ECC) { 1380 pkey = X509_get0_pubkey(s->session->peer_cert); 1381 } 1382 if (pkey == NULL) { 1383 al = SSL_AD_ILLEGAL_PARAMETER; 1384 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1385 goto fatal_err; 1386 } 1387 1388 if (SSL_USE_SIGALGS(s)) { 1389 if (!CBS_get_u16(&cbs, &sigalg_value)) 1390 goto decode_err; 1391 } 1392 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1393 goto decode_err; 1394 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1395 al = SSL_AD_DECODE_ERROR; 1396 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1397 goto fatal_err; 1398 } 1399 1400 if ((sigalg = ssl_sigalg_for_peer(s, pkey, 1401 sigalg_value)) == NULL) { 1402 al = SSL_AD_DECODE_ERROR; 1403 goto fatal_err; 1404 } 1405 s->s3->hs.peer_sigalg = sigalg; 1406 1407 if (!EVP_DigestVerifyInit(md_ctx, &pctx, sigalg->md(), 1408 NULL, pkey)) 1409 goto err; 1410 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1411 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1412 RSA_PKCS1_PSS_PADDING) || 1413 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1414 goto err; 1415 if (EVP_DigestVerify(md_ctx, CBS_data(&signature), 1416 CBS_len(&signature), signed_params, signed_params_len) <= 0) { 1417 al = SSL_AD_DECRYPT_ERROR; 1418 SSLerror(s, SSL_R_BAD_SIGNATURE); 1419 goto fatal_err; 1420 } 1421 } 1422 1423 if (CBS_len(&cbs) != 0) { 1424 al = SSL_AD_DECODE_ERROR; 1425 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1426 goto fatal_err; 1427 } 1428 1429 EVP_MD_CTX_free(md_ctx); 1430 free(signed_params); 1431 1432 return (1); 1433 1434 decode_err: 1435 al = SSL_AD_DECODE_ERROR; 1436 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1437 1438 fatal_err: 1439 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1440 1441 err: 1442 CBB_cleanup(&cbb); 1443 EVP_MD_CTX_free(md_ctx); 1444 free(signed_params); 1445 1446 return (-1); 1447 } 1448 1449 static int 1450 ssl3_get_certificate_request(SSL *s) 1451 { 1452 CBS cert_request, cert_types, rdn_list; 1453 X509_NAME *xn = NULL; 1454 const unsigned char *q; 1455 STACK_OF(X509_NAME) *ca_sk = NULL; 1456 int ret; 1457 1458 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1459 SSL3_ST_CR_CERT_REQ_B, -1, s->max_cert_list)) <= 0) 1460 return ret; 1461 1462 ret = 0; 1463 1464 s->s3->hs.tls12.cert_request = 0; 1465 1466 if (s->s3->hs.tls12.message_type == SSL3_MT_SERVER_DONE) { 1467 s->s3->hs.tls12.reuse_message = 1; 1468 /* 1469 * If we get here we don't need any cached handshake records 1470 * as we wont be doing client auth. 1471 */ 1472 tls1_transcript_free(s); 1473 return (1); 1474 } 1475 1476 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1477 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1478 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1479 goto err; 1480 } 1481 1482 /* TLS does not like anon-DH with client cert */ 1483 if (s->s3->hs.cipher->algorithm_auth & SSL_aNULL) { 1484 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1485 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1486 goto err; 1487 } 1488 1489 if (s->init_num < 0) 1490 goto decode_err; 1491 CBS_init(&cert_request, s->init_msg, s->init_num); 1492 1493 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1494 SSLerror(s, ERR_R_MALLOC_FAILURE); 1495 goto err; 1496 } 1497 1498 if (!CBS_get_u8_length_prefixed(&cert_request, &cert_types)) 1499 goto decode_err; 1500 1501 if (SSL_USE_SIGALGS(s)) { 1502 CBS sigalgs; 1503 1504 if (CBS_len(&cert_request) < 2) { 1505 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1506 goto err; 1507 } 1508 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1509 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1510 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1511 goto err; 1512 } 1513 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1514 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1515 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1516 goto err; 1517 } 1518 if (!CBS_stow(&sigalgs, &s->s3->hs.sigalgs, 1519 &s->s3->hs.sigalgs_len)) 1520 goto err; 1521 } 1522 1523 /* get the CA RDNs */ 1524 if (CBS_len(&cert_request) < 2) { 1525 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1526 goto err; 1527 } 1528 1529 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1530 CBS_len(&cert_request) != 0) { 1531 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1532 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1533 goto err; 1534 } 1535 1536 while (CBS_len(&rdn_list) > 0) { 1537 CBS rdn; 1538 1539 if (CBS_len(&rdn_list) < 2) { 1540 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1541 goto err; 1542 } 1543 1544 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1545 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1546 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1547 goto err; 1548 } 1549 1550 q = CBS_data(&rdn); 1551 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1552 ssl3_send_alert(s, SSL3_AL_FATAL, 1553 SSL_AD_DECODE_ERROR); 1554 SSLerror(s, ERR_R_ASN1_LIB); 1555 goto err; 1556 } 1557 1558 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1559 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1560 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1561 goto err; 1562 } 1563 if (!sk_X509_NAME_push(ca_sk, xn)) { 1564 SSLerror(s, ERR_R_MALLOC_FAILURE); 1565 goto err; 1566 } 1567 xn = NULL; /* avoid free in err block */ 1568 } 1569 1570 /* we should setup a certificate to return.... */ 1571 s->s3->hs.tls12.cert_request = 1; 1572 sk_X509_NAME_pop_free(s->s3->hs.tls12.ca_names, X509_NAME_free); 1573 s->s3->hs.tls12.ca_names = ca_sk; 1574 ca_sk = NULL; 1575 1576 ret = 1; 1577 if (0) { 1578 decode_err: 1579 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1580 } 1581 err: 1582 X509_NAME_free(xn); 1583 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1584 return (ret); 1585 } 1586 1587 static int 1588 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1589 { 1590 return (X509_NAME_cmp(*a, *b)); 1591 } 1592 1593 static int 1594 ssl3_get_new_session_ticket(SSL *s) 1595 { 1596 uint32_t lifetime_hint; 1597 CBS cbs, session_ticket; 1598 unsigned int session_id_length = 0; 1599 int al, ret; 1600 1601 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1602 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384)) <= 0) 1603 return ret; 1604 1605 if (s->s3->hs.tls12.message_type == SSL3_MT_FINISHED) { 1606 s->s3->hs.tls12.reuse_message = 1; 1607 return (1); 1608 } 1609 if (s->s3->hs.tls12.message_type != SSL3_MT_NEWSESSION_TICKET) { 1610 al = SSL_AD_UNEXPECTED_MESSAGE; 1611 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1612 goto fatal_err; 1613 } 1614 1615 if (s->init_num < 0) { 1616 al = SSL_AD_DECODE_ERROR; 1617 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1618 goto fatal_err; 1619 } 1620 1621 CBS_init(&cbs, s->init_msg, s->init_num); 1622 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1623 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1624 CBS_len(&cbs) != 0) { 1625 al = SSL_AD_DECODE_ERROR; 1626 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1627 goto fatal_err; 1628 } 1629 s->session->tlsext_tick_lifetime_hint = lifetime_hint; 1630 1631 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1632 &s->session->tlsext_ticklen)) { 1633 SSLerror(s, ERR_R_MALLOC_FAILURE); 1634 goto err; 1635 } 1636 1637 /* 1638 * There are two ways to detect a resumed ticket session. 1639 * One is to set an appropriate session ID and then the server 1640 * must return a match in ServerHello. This allows the normal 1641 * client session ID matching to work and we know much 1642 * earlier that the ticket has been accepted. 1643 * 1644 * The other way is to set zero length session ID when the 1645 * ticket is presented and rely on the handshake to determine 1646 * session resumption. 1647 * 1648 * We choose the former approach because this fits in with 1649 * assumptions elsewhere in OpenSSL. The session ID is set 1650 * to the SHA256 hash of the ticket. 1651 */ 1652 /* XXX - ensure this doesn't overflow session_id if hash is changed. */ 1653 if (!EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1654 s->session->session_id, &session_id_length, EVP_sha256(), NULL)) { 1655 al = SSL_AD_INTERNAL_ERROR; 1656 SSLerror(s, ERR_R_EVP_LIB); 1657 goto fatal_err; 1658 } 1659 s->session->session_id_length = session_id_length; 1660 1661 return (1); 1662 1663 fatal_err: 1664 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1665 err: 1666 return (-1); 1667 } 1668 1669 static int 1670 ssl3_get_cert_status(SSL *s) 1671 { 1672 CBS cert_status, response; 1673 uint8_t status_type; 1674 int al, ret; 1675 1676 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1677 SSL3_ST_CR_CERT_STATUS_B, -1, 16384)) <= 0) 1678 return ret; 1679 1680 if (s->s3->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1681 /* 1682 * Tell the callback the server did not send us an OSCP 1683 * response, and has decided to head directly to key exchange. 1684 */ 1685 if (s->ctx->tlsext_status_cb) { 1686 free(s->tlsext_ocsp_resp); 1687 s->tlsext_ocsp_resp = NULL; 1688 s->tlsext_ocsp_resp_len = 0; 1689 1690 ret = s->ctx->tlsext_status_cb(s, 1691 s->ctx->tlsext_status_arg); 1692 if (ret == 0) { 1693 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1694 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1695 goto fatal_err; 1696 } 1697 if (ret < 0) { 1698 al = SSL_AD_INTERNAL_ERROR; 1699 SSLerror(s, ERR_R_MALLOC_FAILURE); 1700 goto fatal_err; 1701 } 1702 } 1703 s->s3->hs.tls12.reuse_message = 1; 1704 return (1); 1705 } 1706 1707 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE && 1708 s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE_STATUS) { 1709 al = SSL_AD_UNEXPECTED_MESSAGE; 1710 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1711 goto fatal_err; 1712 } 1713 1714 if (s->init_num < 0) { 1715 /* need at least status type + length */ 1716 al = SSL_AD_DECODE_ERROR; 1717 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1718 goto fatal_err; 1719 } 1720 1721 CBS_init(&cert_status, s->init_msg, s->init_num); 1722 if (!CBS_get_u8(&cert_status, &status_type) || 1723 CBS_len(&cert_status) < 3) { 1724 /* need at least status type + length */ 1725 al = SSL_AD_DECODE_ERROR; 1726 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1727 goto fatal_err; 1728 } 1729 1730 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1731 al = SSL_AD_DECODE_ERROR; 1732 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1733 goto fatal_err; 1734 } 1735 1736 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1737 CBS_len(&cert_status) != 0) { 1738 al = SSL_AD_DECODE_ERROR; 1739 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1740 goto fatal_err; 1741 } 1742 1743 if (!CBS_stow(&response, &s->tlsext_ocsp_resp, 1744 &s->tlsext_ocsp_resp_len)) { 1745 al = SSL_AD_INTERNAL_ERROR; 1746 SSLerror(s, ERR_R_MALLOC_FAILURE); 1747 goto fatal_err; 1748 } 1749 1750 if (s->ctx->tlsext_status_cb) { 1751 ret = s->ctx->tlsext_status_cb(s, 1752 s->ctx->tlsext_status_arg); 1753 if (ret == 0) { 1754 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1755 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1756 goto fatal_err; 1757 } 1758 if (ret < 0) { 1759 al = SSL_AD_INTERNAL_ERROR; 1760 SSLerror(s, ERR_R_MALLOC_FAILURE); 1761 goto fatal_err; 1762 } 1763 } 1764 return (1); 1765 fatal_err: 1766 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1767 return (-1); 1768 } 1769 1770 static int 1771 ssl3_get_server_done(SSL *s) 1772 { 1773 int ret; 1774 1775 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1776 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1777 30 /* should be very small, like 0 :-) */)) <= 0) 1778 return ret; 1779 1780 if (s->init_num != 0) { 1781 /* should contain no data */ 1782 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1783 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1784 return -1; 1785 } 1786 1787 return 1; 1788 } 1789 1790 static int 1791 ssl3_send_client_kex_rsa(SSL *s, CBB *cbb) 1792 { 1793 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1794 unsigned char *enc_pms = NULL; 1795 uint16_t max_legacy_version; 1796 EVP_PKEY *pkey; 1797 RSA *rsa; 1798 int ret = 0; 1799 int enc_len; 1800 CBB epms; 1801 1802 /* 1803 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1804 */ 1805 1806 pkey = X509_get0_pubkey(s->session->peer_cert); 1807 if (pkey == NULL || (rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) { 1808 SSLerror(s, ERR_R_INTERNAL_ERROR); 1809 goto err; 1810 } 1811 1812 /* 1813 * Our maximum legacy protocol version - while RFC 5246 section 7.4.7.1 1814 * says "The latest (newest) version supported by the client", if we're 1815 * doing RSA key exchange then we have to presume that we're talking to 1816 * a server that does not understand the supported versions extension 1817 * and therefore our maximum version is that sent in the ClientHello. 1818 */ 1819 if (!ssl_max_legacy_version(s, &max_legacy_version)) 1820 goto err; 1821 pms[0] = max_legacy_version >> 8; 1822 pms[1] = max_legacy_version & 0xff; 1823 arc4random_buf(&pms[2], sizeof(pms) - 2); 1824 1825 if ((enc_pms = malloc(RSA_size(rsa))) == NULL) { 1826 SSLerror(s, ERR_R_MALLOC_FAILURE); 1827 goto err; 1828 } 1829 1830 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, rsa, 1831 RSA_PKCS1_PADDING); 1832 if (enc_len <= 0) { 1833 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1834 goto err; 1835 } 1836 1837 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1838 goto err; 1839 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 1840 goto err; 1841 if (!CBB_flush(cbb)) 1842 goto err; 1843 1844 if (!tls12_derive_master_secret(s, pms, sizeof(pms))) 1845 goto err; 1846 1847 ret = 1; 1848 1849 err: 1850 explicit_bzero(pms, sizeof(pms)); 1851 free(enc_pms); 1852 1853 return ret; 1854 } 1855 1856 static int 1857 ssl3_send_client_kex_dhe(SSL *s, CBB *cbb) 1858 { 1859 uint8_t *key = NULL; 1860 size_t key_len = 0; 1861 int ret = 0; 1862 1863 /* Ensure that we have an ephemeral key from the server for DHE. */ 1864 if (s->s3->hs.key_share == NULL) { 1865 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1866 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1867 goto err; 1868 } 1869 1870 if (!tls_key_share_generate(s->s3->hs.key_share)) 1871 goto err; 1872 if (!tls_key_share_public(s->s3->hs.key_share, cbb)) 1873 goto err; 1874 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len)) 1875 goto err; 1876 1877 if (!tls_key_share_peer_security(s, s->s3->hs.key_share)) { 1878 SSLerror(s, SSL_R_DH_KEY_TOO_SMALL); 1879 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1880 return 0; 1881 } 1882 1883 if (!tls12_derive_master_secret(s, key, key_len)) 1884 goto err; 1885 1886 ret = 1; 1887 1888 err: 1889 freezero(key, key_len); 1890 1891 return ret; 1892 } 1893 1894 static int 1895 ssl3_send_client_kex_ecdhe(SSL *s, CBB *cbb) 1896 { 1897 uint8_t *key = NULL; 1898 size_t key_len = 0; 1899 CBB public; 1900 int ret = 0; 1901 1902 /* Ensure that we have an ephemeral key for ECDHE. */ 1903 if (s->s3->hs.key_share == NULL) { 1904 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1905 SSLerror(s, ERR_R_INTERNAL_ERROR); 1906 goto err; 1907 } 1908 1909 if (!tls_key_share_generate(s->s3->hs.key_share)) 1910 goto err; 1911 1912 if (!CBB_add_u8_length_prefixed(cbb, &public)) 1913 return 0; 1914 if (!tls_key_share_public(s->s3->hs.key_share, &public)) 1915 goto err; 1916 if (!CBB_flush(cbb)) 1917 goto err; 1918 1919 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len)) 1920 goto err; 1921 1922 if (!tls12_derive_master_secret(s, key, key_len)) 1923 goto err; 1924 1925 ret = 1; 1926 1927 err: 1928 freezero(key, key_len); 1929 1930 return ret; 1931 } 1932 1933 static int 1934 ssl3_send_client_kex_gost(SSL *s, CBB *cbb) 1935 { 1936 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 1937 EVP_PKEY_CTX *pkey_ctx = NULL; 1938 EVP_MD_CTX *ukm_hash = NULL; 1939 EVP_PKEY *pkey; 1940 size_t msglen; 1941 unsigned int md_len; 1942 CBB gostblob; 1943 int nid; 1944 int ret = 0; 1945 1946 /* Get server certificate PKEY and create ctx from it */ 1947 pkey = X509_get0_pubkey(s->session->peer_cert); 1948 if (pkey == NULL || s->session->peer_cert_type != SSL_PKEY_GOST01) { 1949 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 1950 goto err; 1951 } 1952 if ((pkey_ctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) { 1953 SSLerror(s, ERR_R_MALLOC_FAILURE); 1954 goto err; 1955 } 1956 1957 /* 1958 * If we have send a certificate, and certificate key parameters match 1959 * those of server certificate, use certificate key for key exchange. 1960 * Otherwise, generate ephemeral key pair. 1961 */ 1962 if (EVP_PKEY_encrypt_init(pkey_ctx) <= 0) 1963 goto err; 1964 1965 /* Generate session key. */ 1966 arc4random_buf(premaster_secret, sizeof(premaster_secret)); 1967 1968 /* 1969 * If we have client certificate, use its secret as peer key. 1970 * XXX - this presumably lacks PFS. 1971 */ 1972 if (s->s3->hs.tls12.cert_request != 0 && 1973 s->cert->key->privatekey != NULL) { 1974 if (EVP_PKEY_derive_set_peer(pkey_ctx, 1975 s->cert->key->privatekey) <=0) { 1976 /* 1977 * If there was an error - just ignore it. 1978 * Ephemeral key would be used. 1979 */ 1980 ERR_clear_error(); 1981 } 1982 } 1983 1984 /* 1985 * Compute shared IV and store it in algorithm-specific context data. 1986 */ 1987 if ((ukm_hash = EVP_MD_CTX_new()) == NULL) { 1988 SSLerror(s, ERR_R_MALLOC_FAILURE); 1989 goto err; 1990 } 1991 1992 /* XXX check handshake hash instead. */ 1993 if (s->s3->hs.cipher->algorithm2 & SSL_HANDSHAKE_MAC_GOST94) 1994 nid = NID_id_GostR3411_94; 1995 else 1996 nid = NID_id_tc26_gost3411_2012_256; 1997 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 1998 goto err; 1999 if (!EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE)) 2000 goto err; 2001 if (!EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE)) 2002 goto err; 2003 if (!EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len)) 2004 goto err; 2005 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2006 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2007 SSLerror(s, SSL_R_LIBRARY_BUG); 2008 goto err; 2009 } 2010 2011 /* 2012 * Make GOST keytransport blob message, encapsulate it into sequence. 2013 */ 2014 msglen = 255; 2015 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2016 sizeof(premaster_secret)) < 0) { 2017 SSLerror(s, SSL_R_LIBRARY_BUG); 2018 goto err; 2019 } 2020 2021 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2022 goto err; 2023 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2024 goto err; 2025 if (!CBB_flush(cbb)) 2026 goto err; 2027 2028 /* Check if pubkey from client certificate was used. */ 2029 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2030 NULL) > 0) 2031 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2032 2033 if (!tls12_derive_master_secret(s, premaster_secret, 32)) 2034 goto err; 2035 2036 ret = 1; 2037 2038 err: 2039 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2040 EVP_PKEY_CTX_free(pkey_ctx); 2041 EVP_MD_CTX_free(ukm_hash); 2042 2043 return ret; 2044 } 2045 2046 static int 2047 ssl3_send_client_key_exchange(SSL *s) 2048 { 2049 unsigned long alg_k; 2050 CBB cbb, kex; 2051 2052 memset(&cbb, 0, sizeof(cbb)); 2053 2054 if (s->s3->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2055 alg_k = s->s3->hs.cipher->algorithm_mkey; 2056 2057 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2058 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2059 goto err; 2060 2061 if (alg_k & SSL_kRSA) { 2062 if (!ssl3_send_client_kex_rsa(s, &kex)) 2063 goto err; 2064 } else if (alg_k & SSL_kDHE) { 2065 if (!ssl3_send_client_kex_dhe(s, &kex)) 2066 goto err; 2067 } else if (alg_k & SSL_kECDHE) { 2068 if (!ssl3_send_client_kex_ecdhe(s, &kex)) 2069 goto err; 2070 } else if (alg_k & SSL_kGOST) { 2071 if (!ssl3_send_client_kex_gost(s, &kex)) 2072 goto err; 2073 } else { 2074 ssl3_send_alert(s, SSL3_AL_FATAL, 2075 SSL_AD_HANDSHAKE_FAILURE); 2076 SSLerror(s, ERR_R_INTERNAL_ERROR); 2077 goto err; 2078 } 2079 2080 if (!ssl3_handshake_msg_finish(s, &cbb)) 2081 goto err; 2082 2083 s->s3->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2084 } 2085 2086 /* SSL3_ST_CW_KEY_EXCH_B */ 2087 return (ssl3_handshake_write(s)); 2088 2089 err: 2090 CBB_cleanup(&cbb); 2091 2092 return (-1); 2093 } 2094 2095 static int 2096 ssl3_send_client_verify_sigalgs(SSL *s, EVP_PKEY *pkey, 2097 const struct ssl_sigalg *sigalg, CBB *cert_verify) 2098 { 2099 CBB cbb_signature; 2100 EVP_PKEY_CTX *pctx = NULL; 2101 EVP_MD_CTX *mctx = NULL; 2102 const unsigned char *hdata; 2103 unsigned char *signature = NULL; 2104 size_t signature_len, hdata_len; 2105 int ret = 0; 2106 2107 if ((mctx = EVP_MD_CTX_new()) == NULL) 2108 goto err; 2109 2110 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2111 SSLerror(s, ERR_R_INTERNAL_ERROR); 2112 goto err; 2113 } 2114 if (!EVP_DigestSignInit(mctx, &pctx, sigalg->md(), NULL, pkey)) { 2115 SSLerror(s, ERR_R_EVP_LIB); 2116 goto err; 2117 } 2118 #ifndef OPENSSL_NO_GOST 2119 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2120 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2121 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2122 SSLerror(s, ERR_R_EVP_LIB); 2123 goto err; 2124 } 2125 #endif 2126 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2127 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2128 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2129 SSLerror(s, ERR_R_EVP_LIB); 2130 goto err; 2131 } 2132 if (!EVP_DigestSign(mctx, NULL, &signature_len, hdata, hdata_len)) { 2133 SSLerror(s, ERR_R_EVP_LIB); 2134 goto err; 2135 } 2136 if ((signature = calloc(1, signature_len)) == NULL) { 2137 SSLerror(s, ERR_R_MALLOC_FAILURE); 2138 goto err; 2139 } 2140 if (!EVP_DigestSign(mctx, signature, &signature_len, hdata, hdata_len)) { 2141 SSLerror(s, ERR_R_EVP_LIB); 2142 goto err; 2143 } 2144 2145 if (!CBB_add_u16(cert_verify, sigalg->value)) 2146 goto err; 2147 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2148 goto err; 2149 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2150 goto err; 2151 if (!CBB_flush(cert_verify)) 2152 goto err; 2153 2154 ret = 1; 2155 2156 err: 2157 EVP_MD_CTX_free(mctx); 2158 free(signature); 2159 return ret; 2160 } 2161 2162 static int 2163 ssl3_send_client_verify_rsa(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2164 { 2165 CBB cbb_signature; 2166 RSA *rsa; 2167 unsigned char data[EVP_MAX_MD_SIZE]; 2168 unsigned char *signature = NULL; 2169 unsigned int signature_len; 2170 size_t data_len; 2171 int ret = 0; 2172 2173 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2174 goto err; 2175 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2176 goto err; 2177 if ((rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) 2178 goto err; 2179 if (RSA_sign(NID_md5_sha1, data, data_len, signature, &signature_len, 2180 rsa) <= 0 ) { 2181 SSLerror(s, ERR_R_RSA_LIB); 2182 goto err; 2183 } 2184 2185 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2186 goto err; 2187 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2188 goto err; 2189 if (!CBB_flush(cert_verify)) 2190 goto err; 2191 2192 ret = 1; 2193 err: 2194 free(signature); 2195 return ret; 2196 } 2197 2198 static int 2199 ssl3_send_client_verify_ec(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2200 { 2201 CBB cbb_signature; 2202 EC_KEY *eckey; 2203 unsigned char data[EVP_MAX_MD_SIZE]; 2204 unsigned char *signature = NULL; 2205 unsigned int signature_len; 2206 int ret = 0; 2207 2208 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2209 goto err; 2210 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2211 goto err; 2212 if ((eckey = EVP_PKEY_get0_EC_KEY(pkey)) == NULL) 2213 goto err; 2214 if (!ECDSA_sign(0, &data[MD5_DIGEST_LENGTH], SHA_DIGEST_LENGTH, 2215 signature, &signature_len, eckey)) { 2216 SSLerror(s, ERR_R_ECDSA_LIB); 2217 goto err; 2218 } 2219 2220 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2221 goto err; 2222 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2223 goto err; 2224 if (!CBB_flush(cert_verify)) 2225 goto err; 2226 2227 ret = 1; 2228 err: 2229 free(signature); 2230 return ret; 2231 } 2232 2233 #ifndef OPENSSL_NO_GOST 2234 static int 2235 ssl3_send_client_verify_gost(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2236 { 2237 CBB cbb_signature; 2238 EVP_MD_CTX *mctx; 2239 EVP_PKEY_CTX *pctx; 2240 const EVP_MD *md; 2241 const unsigned char *hdata; 2242 unsigned char *signature = NULL; 2243 size_t signature_len; 2244 size_t hdata_len; 2245 int nid; 2246 int ret = 0; 2247 2248 if ((mctx = EVP_MD_CTX_new()) == NULL) 2249 goto err; 2250 2251 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2252 SSLerror(s, ERR_R_INTERNAL_ERROR); 2253 goto err; 2254 } 2255 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2256 (md = EVP_get_digestbynid(nid)) == NULL) { 2257 SSLerror(s, ERR_R_EVP_LIB); 2258 goto err; 2259 } 2260 if (!EVP_DigestSignInit(mctx, &pctx, md, NULL, pkey)) { 2261 SSLerror(s, ERR_R_EVP_LIB); 2262 goto err; 2263 } 2264 #ifndef OPENSSL_NO_GOST 2265 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2266 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2267 SSLerror(s, ERR_R_EVP_LIB); 2268 goto err; 2269 } 2270 #endif 2271 if (!EVP_DigestSign(mctx, NULL, &signature_len, hdata, hdata_len)) { 2272 SSLerror(s, ERR_R_EVP_LIB); 2273 goto err; 2274 } 2275 if ((signature = calloc(1, signature_len)) == NULL) { 2276 SSLerror(s, ERR_R_MALLOC_FAILURE); 2277 goto err; 2278 } 2279 if (!EVP_DigestSign(mctx, signature, &signature_len, hdata, hdata_len)) { 2280 SSLerror(s, ERR_R_EVP_LIB); 2281 goto err; 2282 } 2283 2284 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2285 goto err; 2286 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2287 goto err; 2288 if (!CBB_flush(cert_verify)) 2289 goto err; 2290 2291 ret = 1; 2292 err: 2293 EVP_MD_CTX_free(mctx); 2294 free(signature); 2295 return ret; 2296 } 2297 #endif 2298 2299 static int 2300 ssl3_send_client_verify(SSL *s) 2301 { 2302 const struct ssl_sigalg *sigalg; 2303 CBB cbb, cert_verify; 2304 EVP_PKEY *pkey; 2305 2306 memset(&cbb, 0, sizeof(cbb)); 2307 2308 if (s->s3->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2309 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2310 SSL3_MT_CERTIFICATE_VERIFY)) 2311 goto err; 2312 2313 pkey = s->cert->key->privatekey; 2314 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2315 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2316 goto err; 2317 } 2318 s->s3->hs.our_sigalg = sigalg; 2319 2320 /* 2321 * For TLS v1.2 send signature algorithm and signature using 2322 * agreed digest and cached handshake records. 2323 */ 2324 if (SSL_USE_SIGALGS(s)) { 2325 if (!ssl3_send_client_verify_sigalgs(s, pkey, sigalg, 2326 &cert_verify)) 2327 goto err; 2328 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_RSA) { 2329 if (!ssl3_send_client_verify_rsa(s, pkey, &cert_verify)) 2330 goto err; 2331 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) { 2332 if (!ssl3_send_client_verify_ec(s, pkey, &cert_verify)) 2333 goto err; 2334 #ifndef OPENSSL_NO_GOST 2335 } else if (EVP_PKEY_id(pkey) == NID_id_GostR3410_94 || 2336 EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) { 2337 if (!ssl3_send_client_verify_gost(s, pkey, &cert_verify)) 2338 goto err; 2339 #endif 2340 } else { 2341 SSLerror(s, ERR_R_INTERNAL_ERROR); 2342 goto err; 2343 } 2344 2345 tls1_transcript_free(s); 2346 2347 if (!ssl3_handshake_msg_finish(s, &cbb)) 2348 goto err; 2349 2350 s->s3->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2351 } 2352 2353 return (ssl3_handshake_write(s)); 2354 2355 err: 2356 CBB_cleanup(&cbb); 2357 2358 return (-1); 2359 } 2360 2361 static int 2362 ssl3_send_client_certificate(SSL *s) 2363 { 2364 EVP_PKEY *pkey = NULL; 2365 X509 *x509 = NULL; 2366 CBB cbb, client_cert; 2367 int i; 2368 2369 memset(&cbb, 0, sizeof(cbb)); 2370 2371 if (s->s3->hs.state == SSL3_ST_CW_CERT_A) { 2372 if (s->cert->key->x509 == NULL || 2373 s->cert->key->privatekey == NULL) 2374 s->s3->hs.state = SSL3_ST_CW_CERT_B; 2375 else 2376 s->s3->hs.state = SSL3_ST_CW_CERT_C; 2377 } 2378 2379 /* We need to get a client cert */ 2380 if (s->s3->hs.state == SSL3_ST_CW_CERT_B) { 2381 /* 2382 * If we get an error, we need to 2383 * ssl->rwstate = SSL_X509_LOOKUP; return(-1); 2384 * We then get retried later. 2385 */ 2386 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2387 if (i < 0) { 2388 s->rwstate = SSL_X509_LOOKUP; 2389 return (-1); 2390 } 2391 s->rwstate = SSL_NOTHING; 2392 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2393 s->s3->hs.state = SSL3_ST_CW_CERT_B; 2394 if (!SSL_use_certificate(s, x509) || 2395 !SSL_use_PrivateKey(s, pkey)) 2396 i = 0; 2397 } else if (i == 1) { 2398 i = 0; 2399 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2400 } 2401 2402 X509_free(x509); 2403 EVP_PKEY_free(pkey); 2404 if (i == 0) { 2405 s->s3->hs.tls12.cert_request = 2; 2406 2407 /* There is no client certificate to verify. */ 2408 tls1_transcript_free(s); 2409 } 2410 2411 /* Ok, we have a cert */ 2412 s->s3->hs.state = SSL3_ST_CW_CERT_C; 2413 } 2414 2415 if (s->s3->hs.state == SSL3_ST_CW_CERT_C) { 2416 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2417 SSL3_MT_CERTIFICATE)) 2418 goto err; 2419 if (!ssl3_output_cert_chain(s, &client_cert, 2420 (s->s3->hs.tls12.cert_request == 2) ? NULL : s->cert->key)) 2421 goto err; 2422 if (!ssl3_handshake_msg_finish(s, &cbb)) 2423 goto err; 2424 2425 s->s3->hs.state = SSL3_ST_CW_CERT_D; 2426 } 2427 2428 /* SSL3_ST_CW_CERT_D */ 2429 return (ssl3_handshake_write(s)); 2430 2431 err: 2432 CBB_cleanup(&cbb); 2433 2434 return (0); 2435 } 2436 2437 #define has_bits(i,m) (((i)&(m)) == (m)) 2438 2439 static int 2440 ssl3_check_cert_and_algorithm(SSL *s) 2441 { 2442 long alg_k, alg_a; 2443 int nid = NID_undef; 2444 int i; 2445 2446 alg_k = s->s3->hs.cipher->algorithm_mkey; 2447 alg_a = s->s3->hs.cipher->algorithm_auth; 2448 2449 /* We don't have a certificate. */ 2450 if (alg_a & SSL_aNULL) 2451 return (1); 2452 2453 if (s->s3->hs.key_share != NULL) 2454 nid = tls_key_share_nid(s->s3->hs.key_share); 2455 2456 /* This is the passed certificate. */ 2457 2458 if (s->session->peer_cert_type == SSL_PKEY_ECC) { 2459 if (!ssl_check_srvr_ecc_cert_and_alg(s, s->session->peer_cert)) { 2460 SSLerror(s, SSL_R_BAD_ECC_CERT); 2461 goto fatal_err; 2462 } 2463 return (1); 2464 } 2465 2466 i = X509_certificate_type(s->session->peer_cert, NULL); 2467 2468 /* Check that we have a certificate if we require one. */ 2469 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2470 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2471 goto fatal_err; 2472 } 2473 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2474 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2475 goto fatal_err; 2476 } 2477 if ((alg_k & SSL_kDHE) && 2478 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (nid == NID_dhKeyAgreement))) { 2479 SSLerror(s, SSL_R_MISSING_DH_KEY); 2480 goto fatal_err; 2481 } 2482 2483 return (1); 2484 2485 fatal_err: 2486 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2487 2488 return (0); 2489 } 2490 2491 /* 2492 * Check to see if handshake is full or resumed. Usually this is just a 2493 * case of checking to see if a cache hit has occurred. In the case of 2494 * session tickets we have to check the next message to be sure. 2495 */ 2496 2497 static int 2498 ssl3_check_finished(SSL *s) 2499 { 2500 int ret; 2501 2502 /* If we have no ticket it cannot be a resumed session. */ 2503 if (!s->session->tlsext_tick) 2504 return (1); 2505 /* this function is called when we really expect a Certificate 2506 * message, so permit appropriate message length */ 2507 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2508 SSL3_ST_CR_CERT_B, -1, s->max_cert_list)) <= 0) 2509 return ret; 2510 2511 s->s3->hs.tls12.reuse_message = 1; 2512 if ((s->s3->hs.tls12.message_type == SSL3_MT_FINISHED) || 2513 (s->s3->hs.tls12.message_type == SSL3_MT_NEWSESSION_TICKET)) 2514 return (2); 2515 2516 return (1); 2517 } 2518 2519 static int 2520 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2521 { 2522 if (s->ctx->client_cert_cb == NULL) 2523 return 0; 2524 2525 return s->ctx->client_cert_cb(s, px509, ppkey); 2526 } 2527 2528 static int 2529 ssl3_send_client_change_cipher_spec(SSL *s) 2530 { 2531 size_t outlen; 2532 CBB cbb; 2533 2534 memset(&cbb, 0, sizeof(cbb)); 2535 2536 if (s->s3->hs.state == SSL3_ST_CW_CHANGE_A) { 2537 if (!CBB_init_fixed(&cbb, s->init_buf->data, 2538 s->init_buf->length)) 2539 goto err; 2540 if (!CBB_add_u8(&cbb, SSL3_MT_CCS)) 2541 goto err; 2542 if (!CBB_finish(&cbb, NULL, &outlen)) 2543 goto err; 2544 2545 if (outlen > INT_MAX) 2546 goto err; 2547 2548 s->init_num = (int)outlen; 2549 s->init_off = 0; 2550 2551 if (SSL_is_dtls(s)) { 2552 s->d1->handshake_write_seq = 2553 s->d1->next_handshake_write_seq; 2554 dtls1_set_message_header_int(s, SSL3_MT_CCS, 0, 2555 s->d1->handshake_write_seq, 0, 0); 2556 dtls1_buffer_message(s, 1); 2557 } 2558 2559 s->s3->hs.state = SSL3_ST_CW_CHANGE_B; 2560 } 2561 2562 /* SSL3_ST_CW_CHANGE_B */ 2563 return ssl3_record_write(s, SSL3_RT_CHANGE_CIPHER_SPEC); 2564 2565 err: 2566 CBB_cleanup(&cbb); 2567 2568 return -1; 2569 } 2570 2571 static int 2572 ssl3_send_client_finished(SSL *s) 2573 { 2574 CBB cbb, finished; 2575 2576 memset(&cbb, 0, sizeof(cbb)); 2577 2578 if (s->s3->hs.state == SSL3_ST_CW_FINISHED_A) { 2579 if (!tls12_derive_finished(s)) 2580 goto err; 2581 2582 /* Copy finished so we can use it for renegotiation checks. */ 2583 memcpy(s->s3->previous_client_finished, 2584 s->s3->hs.finished, s->s3->hs.finished_len); 2585 s->s3->previous_client_finished_len = 2586 s->s3->hs.finished_len; 2587 2588 if (!ssl3_handshake_msg_start(s, &cbb, &finished, 2589 SSL3_MT_FINISHED)) 2590 goto err; 2591 if (!CBB_add_bytes(&finished, s->s3->hs.finished, 2592 s->s3->hs.finished_len)) 2593 goto err; 2594 if (!ssl3_handshake_msg_finish(s, &cbb)) 2595 goto err; 2596 2597 s->s3->hs.state = SSL3_ST_CW_FINISHED_B; 2598 } 2599 2600 return (ssl3_handshake_write(s)); 2601 2602 err: 2603 CBB_cleanup(&cbb); 2604 2605 return (-1); 2606 } 2607 2608 static int 2609 ssl3_get_server_finished(SSL *s) 2610 { 2611 int al, md_len, ret; 2612 CBS cbs; 2613 2614 /* should actually be 36+4 :-) */ 2615 if ((ret = ssl3_get_message(s, SSL3_ST_CR_FINISHED_A, 2616 SSL3_ST_CR_FINISHED_B, SSL3_MT_FINISHED, 64)) <= 0) 2617 return ret; 2618 2619 /* If this occurs, we have missed a message */ 2620 if (!s->s3->change_cipher_spec) { 2621 al = SSL_AD_UNEXPECTED_MESSAGE; 2622 SSLerror(s, SSL_R_GOT_A_FIN_BEFORE_A_CCS); 2623 goto fatal_err; 2624 } 2625 s->s3->change_cipher_spec = 0; 2626 2627 md_len = TLS1_FINISH_MAC_LENGTH; 2628 2629 if (s->init_num < 0) { 2630 al = SSL_AD_DECODE_ERROR; 2631 SSLerror(s, SSL_R_BAD_DIGEST_LENGTH); 2632 goto fatal_err; 2633 } 2634 2635 CBS_init(&cbs, s->init_msg, s->init_num); 2636 2637 if (s->s3->hs.peer_finished_len != md_len || 2638 CBS_len(&cbs) != md_len) { 2639 al = SSL_AD_DECODE_ERROR; 2640 SSLerror(s, SSL_R_BAD_DIGEST_LENGTH); 2641 goto fatal_err; 2642 } 2643 2644 if (!CBS_mem_equal(&cbs, s->s3->hs.peer_finished, CBS_len(&cbs))) { 2645 al = SSL_AD_DECRYPT_ERROR; 2646 SSLerror(s, SSL_R_DIGEST_CHECK_FAILED); 2647 goto fatal_err; 2648 } 2649 2650 /* Copy finished so we can use it for renegotiation checks. */ 2651 OPENSSL_assert(md_len <= EVP_MAX_MD_SIZE); 2652 memcpy(s->s3->previous_server_finished, 2653 s->s3->hs.peer_finished, md_len); 2654 s->s3->previous_server_finished_len = md_len; 2655 2656 return (1); 2657 fatal_err: 2658 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2659 return (0); 2660 } 2661