1 /* $OpenBSD: ssl_clnt.c,v 1.165 2024/02/03 18:03:49 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 #include "bytestring.h" 165 #include "dtls_local.h" 166 #include "ssl_local.h" 167 #include "ssl_sigalgs.h" 168 #include "ssl_tlsext.h" 169 170 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b); 171 172 static int ssl3_send_client_hello(SSL *s); 173 static int ssl3_get_dtls_hello_verify(SSL *s); 174 static int ssl3_get_server_hello(SSL *s); 175 static int ssl3_get_certificate_request(SSL *s); 176 static int ssl3_get_new_session_ticket(SSL *s); 177 static int ssl3_get_cert_status(SSL *s); 178 static int ssl3_get_server_done(SSL *s); 179 static int ssl3_send_client_verify(SSL *s); 180 static int ssl3_send_client_certificate(SSL *s); 181 static int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey); 182 static int ssl3_send_client_key_exchange(SSL *s); 183 static int ssl3_get_server_key_exchange(SSL *s); 184 static int ssl3_get_server_certificate(SSL *s); 185 static int ssl3_check_cert_and_algorithm(SSL *s); 186 static int ssl3_check_finished(SSL *s); 187 static int ssl3_send_client_change_cipher_spec(SSL *s); 188 static int ssl3_send_client_finished(SSL *s); 189 static int ssl3_get_server_finished(SSL *s); 190 191 int 192 ssl3_connect(SSL *s) 193 { 194 int new_state, state, skip = 0; 195 int ret = -1; 196 197 ERR_clear_error(); 198 errno = 0; 199 200 s->in_handshake++; 201 if (!SSL_in_init(s) || SSL_in_before(s)) 202 SSL_clear(s); 203 204 for (;;) { 205 state = s->s3->hs.state; 206 207 switch (s->s3->hs.state) { 208 case SSL_ST_RENEGOTIATE: 209 s->renegotiate = 1; 210 s->s3->hs.state = SSL_ST_CONNECT; 211 s->ctx->stats.sess_connect_renegotiate++; 212 /* break */ 213 case SSL_ST_BEFORE: 214 case SSL_ST_CONNECT: 215 case SSL_ST_BEFORE|SSL_ST_CONNECT: 216 case SSL_ST_OK|SSL_ST_CONNECT: 217 218 s->server = 0; 219 220 ssl_info_callback(s, SSL_CB_HANDSHAKE_START, 1); 221 222 if (!ssl_legacy_stack_version(s, s->version)) { 223 SSLerror(s, ERR_R_INTERNAL_ERROR); 224 ret = -1; 225 goto end; 226 } 227 228 if (!ssl_supported_tls_version_range(s, 229 &s->s3->hs.our_min_tls_version, 230 &s->s3->hs.our_max_tls_version)) { 231 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 232 ret = -1; 233 goto end; 234 } 235 236 if (!ssl_security_version(s, 237 s->s3->hs.our_min_tls_version)) { 238 SSLerror(s, SSL_R_VERSION_TOO_LOW); 239 ret = -1; 240 goto end; 241 } 242 243 if (!ssl3_setup_init_buffer(s)) { 244 ret = -1; 245 goto end; 246 } 247 if (!ssl3_setup_buffers(s)) { 248 ret = -1; 249 goto end; 250 } 251 if (!ssl_init_wbio_buffer(s, 0)) { 252 ret = -1; 253 goto end; 254 } 255 256 /* don't push the buffering BIO quite yet */ 257 258 if (!tls1_transcript_init(s)) { 259 ret = -1; 260 goto end; 261 } 262 263 s->s3->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 264 s->ctx->stats.sess_connect++; 265 s->init_num = 0; 266 267 if (SSL_is_dtls(s)) { 268 /* mark client_random uninitialized */ 269 memset(s->s3->client_random, 0, 270 sizeof(s->s3->client_random)); 271 s->d1->send_cookie = 0; 272 s->hit = 0; 273 } 274 break; 275 276 case SSL3_ST_CW_CLNT_HELLO_A: 277 case SSL3_ST_CW_CLNT_HELLO_B: 278 s->shutdown = 0; 279 280 if (SSL_is_dtls(s)) { 281 /* every DTLS ClientHello resets Finished MAC */ 282 tls1_transcript_reset(s); 283 284 dtls1_start_timer(s); 285 } 286 287 ret = ssl3_send_client_hello(s); 288 if (ret <= 0) 289 goto end; 290 291 if (SSL_is_dtls(s) && s->d1->send_cookie) { 292 s->s3->hs.state = SSL3_ST_CW_FLUSH; 293 s->s3->hs.tls12.next_state = SSL3_ST_CR_SRVR_HELLO_A; 294 } else 295 s->s3->hs.state = SSL3_ST_CR_SRVR_HELLO_A; 296 297 s->init_num = 0; 298 299 /* turn on buffering for the next lot of output */ 300 if (s->bbio != s->wbio) 301 s->wbio = BIO_push(s->bbio, s->wbio); 302 303 break; 304 305 case SSL3_ST_CR_SRVR_HELLO_A: 306 case SSL3_ST_CR_SRVR_HELLO_B: 307 ret = ssl3_get_server_hello(s); 308 if (ret <= 0) 309 goto end; 310 311 if (s->hit) { 312 s->s3->hs.state = SSL3_ST_CR_FINISHED_A; 313 if (!SSL_is_dtls(s)) { 314 if (s->tlsext_ticket_expected) { 315 /* receive renewed session ticket */ 316 s->s3->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 317 } 318 319 /* No client certificate verification. */ 320 tls1_transcript_free(s); 321 } 322 } else if (SSL_is_dtls(s)) { 323 s->s3->hs.state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 324 } else { 325 s->s3->hs.state = SSL3_ST_CR_CERT_A; 326 } 327 s->init_num = 0; 328 break; 329 330 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 331 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 332 ret = ssl3_get_dtls_hello_verify(s); 333 if (ret <= 0) 334 goto end; 335 dtls1_stop_timer(s); 336 if (s->d1->send_cookie) /* start again, with a cookie */ 337 s->s3->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 338 else 339 s->s3->hs.state = SSL3_ST_CR_CERT_A; 340 s->init_num = 0; 341 break; 342 343 case SSL3_ST_CR_CERT_A: 344 case SSL3_ST_CR_CERT_B: 345 ret = ssl3_check_finished(s); 346 if (ret <= 0) 347 goto end; 348 if (ret == 2) { 349 s->hit = 1; 350 if (s->tlsext_ticket_expected) 351 s->s3->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 352 else 353 s->s3->hs.state = SSL3_ST_CR_FINISHED_A; 354 s->init_num = 0; 355 break; 356 } 357 /* Check if it is anon DH/ECDH. */ 358 if (!(s->s3->hs.cipher->algorithm_auth & 359 SSL_aNULL)) { 360 ret = ssl3_get_server_certificate(s); 361 if (ret <= 0) 362 goto end; 363 if (s->tlsext_status_expected) 364 s->s3->hs.state = SSL3_ST_CR_CERT_STATUS_A; 365 else 366 s->s3->hs.state = SSL3_ST_CR_KEY_EXCH_A; 367 } else { 368 skip = 1; 369 s->s3->hs.state = SSL3_ST_CR_KEY_EXCH_A; 370 } 371 s->init_num = 0; 372 break; 373 374 case SSL3_ST_CR_KEY_EXCH_A: 375 case SSL3_ST_CR_KEY_EXCH_B: 376 ret = ssl3_get_server_key_exchange(s); 377 if (ret <= 0) 378 goto end; 379 s->s3->hs.state = SSL3_ST_CR_CERT_REQ_A; 380 s->init_num = 0; 381 382 /* 383 * At this point we check that we have the 384 * required stuff from the server. 385 */ 386 if (!ssl3_check_cert_and_algorithm(s)) { 387 ret = -1; 388 goto end; 389 } 390 break; 391 392 case SSL3_ST_CR_CERT_REQ_A: 393 case SSL3_ST_CR_CERT_REQ_B: 394 ret = ssl3_get_certificate_request(s); 395 if (ret <= 0) 396 goto end; 397 s->s3->hs.state = SSL3_ST_CR_SRVR_DONE_A; 398 s->init_num = 0; 399 break; 400 401 case SSL3_ST_CR_SRVR_DONE_A: 402 case SSL3_ST_CR_SRVR_DONE_B: 403 ret = ssl3_get_server_done(s); 404 if (ret <= 0) 405 goto end; 406 if (SSL_is_dtls(s)) 407 dtls1_stop_timer(s); 408 if (s->s3->hs.tls12.cert_request) 409 s->s3->hs.state = SSL3_ST_CW_CERT_A; 410 else 411 s->s3->hs.state = SSL3_ST_CW_KEY_EXCH_A; 412 s->init_num = 0; 413 414 break; 415 416 case SSL3_ST_CW_CERT_A: 417 case SSL3_ST_CW_CERT_B: 418 case SSL3_ST_CW_CERT_C: 419 case SSL3_ST_CW_CERT_D: 420 if (SSL_is_dtls(s)) 421 dtls1_start_timer(s); 422 ret = ssl3_send_client_certificate(s); 423 if (ret <= 0) 424 goto end; 425 s->s3->hs.state = SSL3_ST_CW_KEY_EXCH_A; 426 s->init_num = 0; 427 break; 428 429 case SSL3_ST_CW_KEY_EXCH_A: 430 case SSL3_ST_CW_KEY_EXCH_B: 431 if (SSL_is_dtls(s)) 432 dtls1_start_timer(s); 433 ret = ssl3_send_client_key_exchange(s); 434 if (ret <= 0) 435 goto end; 436 /* 437 * EAY EAY EAY need to check for DH fix cert 438 * sent back 439 */ 440 /* 441 * For TLS, cert_req is set to 2, so a cert chain 442 * of nothing is sent, but no verify packet is sent 443 */ 444 /* 445 * XXX: For now, we do not support client 446 * authentication in ECDH cipher suites with 447 * ECDH (rather than ECDSA) certificates. 448 * We need to skip the certificate verify 449 * message when client's ECDH public key is sent 450 * inside the client certificate. 451 */ 452 if (s->s3->hs.tls12.cert_request == 1) { 453 s->s3->hs.state = SSL3_ST_CW_CERT_VRFY_A; 454 } else { 455 s->s3->hs.state = SSL3_ST_CW_CHANGE_A; 456 s->s3->change_cipher_spec = 0; 457 } 458 459 s->init_num = 0; 460 break; 461 462 case SSL3_ST_CW_CERT_VRFY_A: 463 case SSL3_ST_CW_CERT_VRFY_B: 464 if (SSL_is_dtls(s)) 465 dtls1_start_timer(s); 466 ret = ssl3_send_client_verify(s); 467 if (ret <= 0) 468 goto end; 469 s->s3->hs.state = SSL3_ST_CW_CHANGE_A; 470 s->init_num = 0; 471 s->s3->change_cipher_spec = 0; 472 break; 473 474 case SSL3_ST_CW_CHANGE_A: 475 case SSL3_ST_CW_CHANGE_B: 476 if (SSL_is_dtls(s) && !s->hit) 477 dtls1_start_timer(s); 478 ret = ssl3_send_client_change_cipher_spec(s); 479 if (ret <= 0) 480 goto end; 481 482 s->s3->hs.state = SSL3_ST_CW_FINISHED_A; 483 s->init_num = 0; 484 s->session->cipher = s->s3->hs.cipher; 485 486 if (!tls1_setup_key_block(s)) { 487 ret = -1; 488 goto end; 489 } 490 if (!tls1_change_write_cipher_state(s)) { 491 ret = -1; 492 goto end; 493 } 494 break; 495 496 case SSL3_ST_CW_FINISHED_A: 497 case SSL3_ST_CW_FINISHED_B: 498 if (SSL_is_dtls(s) && !s->hit) 499 dtls1_start_timer(s); 500 ret = ssl3_send_client_finished(s); 501 if (ret <= 0) 502 goto end; 503 if (!SSL_is_dtls(s)) 504 s->s3->flags |= SSL3_FLAGS_CCS_OK; 505 s->s3->hs.state = SSL3_ST_CW_FLUSH; 506 507 /* clear flags */ 508 if (s->hit) { 509 s->s3->hs.tls12.next_state = SSL_ST_OK; 510 } else { 511 /* Allow NewSessionTicket if ticket expected */ 512 if (s->tlsext_ticket_expected) 513 s->s3->hs.tls12.next_state = 514 SSL3_ST_CR_SESSION_TICKET_A; 515 else 516 s->s3->hs.tls12.next_state = 517 SSL3_ST_CR_FINISHED_A; 518 } 519 s->init_num = 0; 520 break; 521 522 case SSL3_ST_CR_SESSION_TICKET_A: 523 case SSL3_ST_CR_SESSION_TICKET_B: 524 ret = ssl3_get_new_session_ticket(s); 525 if (ret <= 0) 526 goto end; 527 s->s3->hs.state = SSL3_ST_CR_FINISHED_A; 528 s->init_num = 0; 529 break; 530 531 case SSL3_ST_CR_CERT_STATUS_A: 532 case SSL3_ST_CR_CERT_STATUS_B: 533 ret = ssl3_get_cert_status(s); 534 if (ret <= 0) 535 goto end; 536 s->s3->hs.state = SSL3_ST_CR_KEY_EXCH_A; 537 s->init_num = 0; 538 break; 539 540 case SSL3_ST_CR_FINISHED_A: 541 case SSL3_ST_CR_FINISHED_B: 542 if (SSL_is_dtls(s)) 543 s->d1->change_cipher_spec_ok = 1; 544 else 545 s->s3->flags |= SSL3_FLAGS_CCS_OK; 546 ret = ssl3_get_server_finished(s); 547 if (ret <= 0) 548 goto end; 549 if (SSL_is_dtls(s)) 550 dtls1_stop_timer(s); 551 552 if (s->hit) 553 s->s3->hs.state = SSL3_ST_CW_CHANGE_A; 554 else 555 s->s3->hs.state = SSL_ST_OK; 556 s->init_num = 0; 557 break; 558 559 case SSL3_ST_CW_FLUSH: 560 s->rwstate = SSL_WRITING; 561 if (BIO_flush(s->wbio) <= 0) { 562 if (SSL_is_dtls(s)) { 563 /* If the write error was fatal, stop trying */ 564 if (!BIO_should_retry(s->wbio)) { 565 s->rwstate = SSL_NOTHING; 566 s->s3->hs.state = s->s3->hs.tls12.next_state; 567 } 568 } 569 ret = -1; 570 goto end; 571 } 572 s->rwstate = SSL_NOTHING; 573 s->s3->hs.state = s->s3->hs.tls12.next_state; 574 break; 575 576 case SSL_ST_OK: 577 /* clean a few things up */ 578 tls1_cleanup_key_block(s); 579 580 if (s->s3->handshake_transcript != NULL) { 581 SSLerror(s, ERR_R_INTERNAL_ERROR); 582 ret = -1; 583 goto end; 584 } 585 586 if (!SSL_is_dtls(s)) 587 ssl3_release_init_buffer(s); 588 589 ssl_free_wbio_buffer(s); 590 591 s->init_num = 0; 592 s->renegotiate = 0; 593 s->new_session = 0; 594 595 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 596 if (s->hit) 597 s->ctx->stats.sess_hit++; 598 599 ret = 1; 600 /* s->server=0; */ 601 s->handshake_func = ssl3_connect; 602 s->ctx->stats.sess_connect_good++; 603 604 ssl_info_callback(s, SSL_CB_HANDSHAKE_DONE, 1); 605 606 if (SSL_is_dtls(s)) { 607 /* done with handshaking */ 608 s->d1->handshake_read_seq = 0; 609 s->d1->next_handshake_write_seq = 0; 610 } 611 612 goto end; 613 /* break; */ 614 615 default: 616 SSLerror(s, SSL_R_UNKNOWN_STATE); 617 ret = -1; 618 goto end; 619 /* break; */ 620 } 621 622 /* did we do anything */ 623 if (!s->s3->hs.tls12.reuse_message && !skip) { 624 if (s->s3->hs.state != state) { 625 new_state = s->s3->hs.state; 626 s->s3->hs.state = state; 627 ssl_info_callback(s, SSL_CB_CONNECT_LOOP, 1); 628 s->s3->hs.state = new_state; 629 } 630 } 631 skip = 0; 632 } 633 634 end: 635 s->in_handshake--; 636 ssl_info_callback(s, SSL_CB_CONNECT_EXIT, ret); 637 638 return (ret); 639 } 640 641 static int 642 ssl3_send_client_hello(SSL *s) 643 { 644 CBB cbb, client_hello, session_id, cookie, cipher_suites; 645 CBB compression_methods; 646 uint16_t max_version; 647 size_t sl; 648 649 memset(&cbb, 0, sizeof(cbb)); 650 651 if (s->s3->hs.state == SSL3_ST_CW_CLNT_HELLO_A) { 652 SSL_SESSION *sess = s->session; 653 654 if (!ssl_max_supported_version(s, &max_version)) { 655 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 656 return (-1); 657 } 658 s->version = max_version; 659 660 if (sess == NULL || sess->ssl_version != s->version || 661 (sess->session_id_length == 0 && sess->tlsext_tick == NULL) || 662 sess->not_resumable) { 663 if (!ssl_get_new_session(s, 0)) 664 goto err; 665 } 666 /* else use the pre-loaded session */ 667 668 /* 669 * If a DTLS ClientHello message is being resent after a 670 * HelloVerifyRequest, we must retain the original client 671 * random value. 672 */ 673 if (!SSL_is_dtls(s) || s->d1->send_cookie == 0) 674 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE); 675 676 if (!ssl3_handshake_msg_start(s, &cbb, &client_hello, 677 SSL3_MT_CLIENT_HELLO)) 678 goto err; 679 680 if (!CBB_add_u16(&client_hello, s->version)) 681 goto err; 682 683 /* Random stuff */ 684 if (!CBB_add_bytes(&client_hello, s->s3->client_random, 685 sizeof(s->s3->client_random))) 686 goto err; 687 688 /* Session ID */ 689 if (!CBB_add_u8_length_prefixed(&client_hello, &session_id)) 690 goto err; 691 if (!s->new_session && 692 s->session->session_id_length > 0) { 693 sl = s->session->session_id_length; 694 if (sl > sizeof(s->session->session_id)) { 695 SSLerror(s, ERR_R_INTERNAL_ERROR); 696 goto err; 697 } 698 if (!CBB_add_bytes(&session_id, 699 s->session->session_id, sl)) 700 goto err; 701 } 702 703 /* DTLS Cookie. */ 704 if (SSL_is_dtls(s)) { 705 if (s->d1->cookie_len > sizeof(s->d1->cookie)) { 706 SSLerror(s, ERR_R_INTERNAL_ERROR); 707 goto err; 708 } 709 if (!CBB_add_u8_length_prefixed(&client_hello, &cookie)) 710 goto err; 711 if (!CBB_add_bytes(&cookie, s->d1->cookie, 712 s->d1->cookie_len)) 713 goto err; 714 } 715 716 /* Ciphers supported */ 717 if (!CBB_add_u16_length_prefixed(&client_hello, &cipher_suites)) 718 return 0; 719 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), 720 &cipher_suites)) { 721 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE); 722 goto err; 723 } 724 725 /* Add in compression methods (null) */ 726 if (!CBB_add_u8_length_prefixed(&client_hello, 727 &compression_methods)) 728 goto err; 729 if (!CBB_add_u8(&compression_methods, 0)) 730 goto err; 731 732 /* TLS extensions */ 733 if (!tlsext_client_build(s, SSL_TLSEXT_MSG_CH, &client_hello)) { 734 SSLerror(s, ERR_R_INTERNAL_ERROR); 735 goto err; 736 } 737 738 if (!ssl3_handshake_msg_finish(s, &cbb)) 739 goto err; 740 741 s->s3->hs.state = SSL3_ST_CW_CLNT_HELLO_B; 742 } 743 744 /* SSL3_ST_CW_CLNT_HELLO_B */ 745 return (ssl3_handshake_write(s)); 746 747 err: 748 CBB_cleanup(&cbb); 749 750 return (-1); 751 } 752 753 static int 754 ssl3_get_dtls_hello_verify(SSL *s) 755 { 756 CBS hello_verify_request, cookie; 757 size_t cookie_len; 758 uint16_t ssl_version; 759 int al, ret; 760 761 if ((ret = ssl3_get_message(s, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 762 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, s->max_cert_list)) <= 0) 763 return ret; 764 765 if (s->s3->hs.tls12.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 766 s->d1->send_cookie = 0; 767 s->s3->hs.tls12.reuse_message = 1; 768 return (1); 769 } 770 771 if (s->init_num < 0) 772 goto decode_err; 773 774 CBS_init(&hello_verify_request, s->init_msg, 775 s->init_num); 776 777 if (!CBS_get_u16(&hello_verify_request, &ssl_version)) 778 goto decode_err; 779 if (!CBS_get_u8_length_prefixed(&hello_verify_request, &cookie)) 780 goto decode_err; 781 if (CBS_len(&hello_verify_request) != 0) 782 goto decode_err; 783 784 /* 785 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should always 786 * contain DTLSv1.0 the version that is going to be negotiated. 787 * Tolerate DTLSv1.2 just in case. 788 */ 789 if (ssl_version != DTLS1_VERSION && ssl_version != DTLS1_2_VERSION) { 790 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 791 s->version = (s->version & 0xff00) | (ssl_version & 0xff); 792 al = SSL_AD_PROTOCOL_VERSION; 793 goto fatal_err; 794 } 795 796 if (!CBS_write_bytes(&cookie, s->d1->cookie, 797 sizeof(s->d1->cookie), &cookie_len)) { 798 s->d1->cookie_len = 0; 799 al = SSL_AD_ILLEGAL_PARAMETER; 800 goto fatal_err; 801 } 802 s->d1->cookie_len = cookie_len; 803 s->d1->send_cookie = 1; 804 805 return 1; 806 807 decode_err: 808 al = SSL_AD_DECODE_ERROR; 809 fatal_err: 810 ssl3_send_alert(s, SSL3_AL_FATAL, al); 811 return -1; 812 } 813 814 static int 815 ssl3_get_server_hello(SSL *s) 816 { 817 CBS cbs, server_random, session_id; 818 uint16_t server_version, cipher_suite; 819 uint8_t compression_method; 820 const SSL_CIPHER *cipher; 821 const SSL_METHOD *method; 822 int al, ret; 823 824 s->first_packet = 1; 825 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 826 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000 /* ?? */)) <= 0) 827 return ret; 828 s->first_packet = 0; 829 830 if (s->init_num < 0) 831 goto decode_err; 832 833 CBS_init(&cbs, s->init_msg, s->init_num); 834 835 if (SSL_is_dtls(s)) { 836 if (s->s3->hs.tls12.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 837 if (s->d1->send_cookie == 0) { 838 s->s3->hs.tls12.reuse_message = 1; 839 return (1); 840 } else { 841 /* Already sent a cookie. */ 842 al = SSL_AD_UNEXPECTED_MESSAGE; 843 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 844 goto fatal_err; 845 } 846 } 847 } 848 849 if (s->s3->hs.tls12.message_type != SSL3_MT_SERVER_HELLO) { 850 al = SSL_AD_UNEXPECTED_MESSAGE; 851 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 852 goto fatal_err; 853 } 854 855 if (!CBS_get_u16(&cbs, &server_version)) 856 goto decode_err; 857 858 if (!ssl_check_version_from_server(s, server_version)) { 859 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 860 s->version = (s->version & 0xff00) | (server_version & 0xff); 861 al = SSL_AD_PROTOCOL_VERSION; 862 goto fatal_err; 863 } 864 s->s3->hs.peer_legacy_version = server_version; 865 s->version = server_version; 866 867 s->s3->hs.negotiated_tls_version = ssl_tls_version(server_version); 868 if (s->s3->hs.negotiated_tls_version == 0) { 869 SSLerror(s, ERR_R_INTERNAL_ERROR); 870 goto err; 871 } 872 873 if ((method = ssl_get_method(server_version)) == NULL) { 874 SSLerror(s, ERR_R_INTERNAL_ERROR); 875 goto err; 876 } 877 s->method = method; 878 879 /* Server random. */ 880 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 881 goto decode_err; 882 if (!CBS_write_bytes(&server_random, s->s3->server_random, 883 sizeof(s->s3->server_random), NULL)) 884 goto err; 885 886 if (s->s3->hs.our_max_tls_version >= TLS1_2_VERSION && 887 s->s3->hs.negotiated_tls_version < s->s3->hs.our_max_tls_version) { 888 /* 889 * RFC 8446 section 4.1.3. We must not downgrade if the server 890 * random value contains the TLS 1.2 or TLS 1.1 magical value. 891 */ 892 if (!CBS_skip(&server_random, 893 CBS_len(&server_random) - sizeof(tls13_downgrade_12))) 894 goto err; 895 if (s->s3->hs.negotiated_tls_version == TLS1_2_VERSION && 896 CBS_mem_equal(&server_random, tls13_downgrade_12, 897 sizeof(tls13_downgrade_12))) { 898 al = SSL_AD_ILLEGAL_PARAMETER; 899 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 900 goto fatal_err; 901 } 902 if (CBS_mem_equal(&server_random, tls13_downgrade_11, 903 sizeof(tls13_downgrade_11))) { 904 al = SSL_AD_ILLEGAL_PARAMETER; 905 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 906 goto fatal_err; 907 } 908 } 909 910 /* Session ID. */ 911 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 912 goto decode_err; 913 914 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 915 al = SSL_AD_ILLEGAL_PARAMETER; 916 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 917 goto fatal_err; 918 } 919 920 /* Cipher suite. */ 921 if (!CBS_get_u16(&cbs, &cipher_suite)) 922 goto decode_err; 923 924 /* 925 * Check if we want to resume the session based on external 926 * pre-shared secret. 927 */ 928 if (s->tls_session_secret_cb != NULL) { 929 SSL_CIPHER *pref_cipher = NULL; 930 int master_key_length = sizeof(s->session->master_key); 931 932 if (!s->tls_session_secret_cb(s, 933 s->session->master_key, &master_key_length, NULL, 934 &pref_cipher, s->tls_session_secret_cb_arg)) { 935 SSLerror(s, ERR_R_INTERNAL_ERROR); 936 goto err; 937 } 938 if (master_key_length <= 0) { 939 SSLerror(s, ERR_R_INTERNAL_ERROR); 940 goto err; 941 } 942 s->session->master_key_length = master_key_length; 943 944 if ((s->session->cipher = pref_cipher) == NULL) 945 s->session->cipher = 946 ssl3_get_cipher_by_value(cipher_suite); 947 s->s3->flags |= SSL3_FLAGS_CCS_OK; 948 } 949 950 if (s->session->session_id_length != 0 && 951 CBS_mem_equal(&session_id, s->session->session_id, 952 s->session->session_id_length)) { 953 if (s->sid_ctx_length != s->session->sid_ctx_length || 954 timingsafe_memcmp(s->session->sid_ctx, 955 s->sid_ctx, s->sid_ctx_length) != 0) { 956 /* actually a client application bug */ 957 al = SSL_AD_ILLEGAL_PARAMETER; 958 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 959 goto fatal_err; 960 } 961 s->s3->flags |= SSL3_FLAGS_CCS_OK; 962 s->hit = 1; 963 } else { 964 /* a miss or crap from the other end */ 965 966 /* If we were trying for session-id reuse, make a new 967 * SSL_SESSION so we don't stuff up other people */ 968 s->hit = 0; 969 if (s->session->session_id_length > 0) { 970 if (!ssl_get_new_session(s, 0)) { 971 al = SSL_AD_INTERNAL_ERROR; 972 goto fatal_err; 973 } 974 } 975 976 /* 977 * XXX - improve the handling for the case where there is a 978 * zero length session identifier. 979 */ 980 if (!CBS_write_bytes(&session_id, s->session->session_id, 981 sizeof(s->session->session_id), 982 &s->session->session_id_length)) 983 goto err; 984 985 s->session->ssl_version = s->version; 986 } 987 988 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 989 al = SSL_AD_ILLEGAL_PARAMETER; 990 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 991 goto fatal_err; 992 } 993 994 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 995 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 996 s->s3->hs.negotiated_tls_version < TLS1_2_VERSION) { 997 al = SSL_AD_ILLEGAL_PARAMETER; 998 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 999 goto fatal_err; 1000 } 1001 1002 if (!ssl_cipher_in_list(SSL_get_ciphers(s), cipher)) { 1003 /* we did not say we would use this cipher */ 1004 al = SSL_AD_ILLEGAL_PARAMETER; 1005 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1006 goto fatal_err; 1007 } 1008 1009 /* 1010 * Depending on the session caching (internal/external), the cipher 1011 * and/or cipher_id values may not be set. Make sure that 1012 * cipher_id is set and use it for comparison. 1013 */ 1014 if (s->session->cipher) 1015 s->session->cipher_id = s->session->cipher->id; 1016 if (s->hit && (s->session->cipher_id != cipher->id)) { 1017 al = SSL_AD_ILLEGAL_PARAMETER; 1018 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1019 goto fatal_err; 1020 } 1021 s->s3->hs.cipher = cipher; 1022 1023 if (!tls1_transcript_hash_init(s)) 1024 goto err; 1025 1026 /* 1027 * Don't digest cached records if no sigalgs: we may need them for 1028 * client authentication. 1029 */ 1030 if (!SSL_USE_SIGALGS(s)) 1031 tls1_transcript_free(s); 1032 1033 if (!CBS_get_u8(&cbs, &compression_method)) 1034 goto decode_err; 1035 1036 if (compression_method != 0) { 1037 al = SSL_AD_ILLEGAL_PARAMETER; 1038 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1039 goto fatal_err; 1040 } 1041 1042 if (!tlsext_client_parse(s, SSL_TLSEXT_MSG_SH, &cbs, &al)) { 1043 SSLerror(s, SSL_R_PARSE_TLSEXT); 1044 goto fatal_err; 1045 } 1046 1047 if (CBS_len(&cbs) != 0) 1048 goto decode_err; 1049 1050 /* 1051 * Determine if we need to see RI. Strictly speaking if we want to 1052 * avoid an attack we should *always* see RI even on initial server 1053 * hello because the client doesn't see any renegotiation during an 1054 * attack. However this would mean we could not connect to any server 1055 * which doesn't support RI so for the immediate future tolerate RI 1056 * absence on initial connect only. 1057 */ 1058 if (!s->s3->renegotiate_seen && 1059 !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1060 al = SSL_AD_HANDSHAKE_FAILURE; 1061 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1062 goto fatal_err; 1063 } 1064 1065 if (ssl_check_serverhello_tlsext(s) <= 0) { 1066 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1067 goto err; 1068 } 1069 1070 return (1); 1071 1072 decode_err: 1073 /* wrong packet length */ 1074 al = SSL_AD_DECODE_ERROR; 1075 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1076 fatal_err: 1077 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1078 err: 1079 return (-1); 1080 } 1081 1082 static int 1083 ssl3_get_server_certificate(SSL *s) 1084 { 1085 CBS cbs, cert_list, cert_data; 1086 STACK_OF(X509) *certs = NULL; 1087 X509 *cert = NULL; 1088 const uint8_t *p; 1089 int al, ret; 1090 1091 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1092 SSL3_ST_CR_CERT_B, -1, s->max_cert_list)) <= 0) 1093 return ret; 1094 1095 ret = -1; 1096 1097 if (s->s3->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1098 s->s3->hs.tls12.reuse_message = 1; 1099 return (1); 1100 } 1101 1102 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE) { 1103 al = SSL_AD_UNEXPECTED_MESSAGE; 1104 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1105 goto fatal_err; 1106 } 1107 1108 if ((certs = sk_X509_new_null()) == NULL) { 1109 SSLerror(s, ERR_R_MALLOC_FAILURE); 1110 goto err; 1111 } 1112 1113 if (s->init_num < 0) 1114 goto decode_err; 1115 1116 CBS_init(&cbs, s->init_msg, s->init_num); 1117 1118 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list)) 1119 goto decode_err; 1120 if (CBS_len(&cbs) != 0) 1121 goto decode_err; 1122 1123 while (CBS_len(&cert_list) > 0) { 1124 if (!CBS_get_u24_length_prefixed(&cert_list, &cert_data)) 1125 goto decode_err; 1126 p = CBS_data(&cert_data); 1127 if ((cert = d2i_X509(NULL, &p, CBS_len(&cert_data))) == NULL) { 1128 al = SSL_AD_BAD_CERTIFICATE; 1129 SSLerror(s, ERR_R_ASN1_LIB); 1130 goto fatal_err; 1131 } 1132 if (p != CBS_data(&cert_data) + CBS_len(&cert_data)) 1133 goto decode_err; 1134 if (!sk_X509_push(certs, cert)) { 1135 SSLerror(s, ERR_R_MALLOC_FAILURE); 1136 goto err; 1137 } 1138 cert = NULL; 1139 } 1140 1141 /* A server must always provide a non-empty certificate list. */ 1142 if (sk_X509_num(certs) < 1) { 1143 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 1144 goto decode_err; 1145 } 1146 1147 if (ssl_verify_cert_chain(s, certs) <= 0 && 1148 s->verify_mode != SSL_VERIFY_NONE) { 1149 al = ssl_verify_alarm_type(s->verify_result); 1150 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1151 goto fatal_err; 1152 } 1153 s->session->verify_result = s->verify_result; 1154 ERR_clear_error(); 1155 1156 if (!tls_process_peer_certs(s, certs)) 1157 goto err; 1158 1159 ret = 1; 1160 1161 if (0) { 1162 decode_err: 1163 /* wrong packet length */ 1164 al = SSL_AD_DECODE_ERROR; 1165 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1166 fatal_err: 1167 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1168 } 1169 err: 1170 sk_X509_pop_free(certs, X509_free); 1171 X509_free(cert); 1172 1173 return (ret); 1174 } 1175 1176 static int 1177 ssl3_get_server_kex_dhe(SSL *s, CBS *cbs) 1178 { 1179 int decode_error, invalid_params, invalid_key; 1180 int nid = NID_dhKeyAgreement; 1181 1182 tls_key_share_free(s->s3->hs.key_share); 1183 if ((s->s3->hs.key_share = tls_key_share_new_nid(nid)) == NULL) 1184 goto err; 1185 1186 if (!tls_key_share_peer_params(s->s3->hs.key_share, cbs, 1187 &decode_error, &invalid_params)) { 1188 if (decode_error) { 1189 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1190 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1191 } 1192 goto err; 1193 } 1194 if (!tls_key_share_peer_public(s->s3->hs.key_share, cbs, 1195 &decode_error, &invalid_key)) { 1196 if (decode_error) { 1197 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1198 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1199 } 1200 goto err; 1201 } 1202 1203 if (invalid_params) { 1204 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1205 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1206 goto err; 1207 } 1208 if (invalid_key) { 1209 SSLerror(s, SSL_R_BAD_DH_PUB_KEY_LENGTH); 1210 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1211 goto err; 1212 } 1213 1214 if (!tls_key_share_peer_security(s, s->s3->hs.key_share)) { 1215 SSLerror(s, SSL_R_DH_KEY_TOO_SMALL); 1216 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1217 return 0; 1218 } 1219 1220 return 1; 1221 1222 err: 1223 return 0; 1224 } 1225 1226 static int 1227 ssl3_get_server_kex_ecdhe(SSL *s, CBS *cbs) 1228 { 1229 uint8_t curve_type; 1230 uint16_t group_id; 1231 int decode_error; 1232 CBS public; 1233 1234 if (!CBS_get_u8(cbs, &curve_type)) 1235 goto decode_err; 1236 if (!CBS_get_u16(cbs, &group_id)) 1237 goto decode_err; 1238 1239 /* Only named curves are supported. */ 1240 if (curve_type != NAMED_CURVE_TYPE) { 1241 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1242 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1243 goto err; 1244 } 1245 1246 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1247 goto decode_err; 1248 1249 /* 1250 * Check that the group is one of our preferences - if it is not, 1251 * the server has sent us an invalid group. 1252 */ 1253 if (!tls1_check_group(s, group_id)) { 1254 SSLerror(s, SSL_R_WRONG_CURVE); 1255 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1256 goto err; 1257 } 1258 1259 tls_key_share_free(s->s3->hs.key_share); 1260 if ((s->s3->hs.key_share = tls_key_share_new(group_id)) == NULL) 1261 goto err; 1262 1263 if (!tls_key_share_peer_public(s->s3->hs.key_share, &public, 1264 &decode_error, NULL)) { 1265 if (decode_error) 1266 goto decode_err; 1267 goto err; 1268 } 1269 1270 return 1; 1271 1272 decode_err: 1273 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1274 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1275 err: 1276 return 0; 1277 } 1278 1279 static int 1280 ssl3_get_server_key_exchange(SSL *s) 1281 { 1282 CBB cbb; 1283 CBS cbs, params, signature; 1284 EVP_MD_CTX *md_ctx; 1285 unsigned char *signed_params = NULL; 1286 size_t signed_params_len; 1287 size_t params_len; 1288 long alg_k, alg_a; 1289 int al, ret; 1290 1291 memset(&cbb, 0, sizeof(cbb)); 1292 1293 alg_k = s->s3->hs.cipher->algorithm_mkey; 1294 alg_a = s->s3->hs.cipher->algorithm_auth; 1295 1296 /* 1297 * Use same message size as in ssl3_get_certificate_request() 1298 * as ServerKeyExchange message may be skipped. 1299 */ 1300 if ((ret = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1301 SSL3_ST_CR_KEY_EXCH_B, -1, s->max_cert_list)) <= 0) 1302 return ret; 1303 1304 if ((md_ctx = EVP_MD_CTX_new()) == NULL) 1305 goto err; 1306 1307 if (s->init_num < 0) 1308 goto err; 1309 1310 CBS_init(&cbs, s->init_msg, s->init_num); 1311 1312 if (s->s3->hs.tls12.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1313 /* 1314 * Do not skip server key exchange if this cipher suite uses 1315 * ephemeral keys. 1316 */ 1317 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1318 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1319 al = SSL_AD_UNEXPECTED_MESSAGE; 1320 goto fatal_err; 1321 } 1322 1323 s->s3->hs.tls12.reuse_message = 1; 1324 EVP_MD_CTX_free(md_ctx); 1325 return (1); 1326 } 1327 1328 if (!CBB_init(&cbb, 0)) 1329 goto err; 1330 if (!CBB_add_bytes(&cbb, s->s3->client_random, SSL3_RANDOM_SIZE)) 1331 goto err; 1332 if (!CBB_add_bytes(&cbb, s->s3->server_random, SSL3_RANDOM_SIZE)) 1333 goto err; 1334 1335 CBS_dup(&cbs, ¶ms); 1336 1337 if (alg_k & SSL_kDHE) { 1338 if (!ssl3_get_server_kex_dhe(s, &cbs)) 1339 goto err; 1340 } else if (alg_k & SSL_kECDHE) { 1341 if (!ssl3_get_server_kex_ecdhe(s, &cbs)) 1342 goto err; 1343 } else if (alg_k != 0) { 1344 al = SSL_AD_UNEXPECTED_MESSAGE; 1345 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1346 goto fatal_err; 1347 } 1348 1349 if ((params_len = CBS_offset(&cbs)) > CBS_len(¶ms)) 1350 goto err; 1351 if (!CBB_add_bytes(&cbb, CBS_data(¶ms), params_len)) 1352 goto err; 1353 if (!CBB_finish(&cbb, &signed_params, &signed_params_len)) 1354 goto err; 1355 1356 /* if it was signed, check the signature */ 1357 if ((alg_a & SSL_aNULL) == 0) { 1358 uint16_t sigalg_value = SIGALG_NONE; 1359 const struct ssl_sigalg *sigalg; 1360 EVP_PKEY_CTX *pctx; 1361 EVP_PKEY *pkey = NULL; 1362 1363 if ((alg_a & SSL_aRSA) != 0 && 1364 s->session->peer_cert_type == SSL_PKEY_RSA) { 1365 pkey = X509_get0_pubkey(s->session->peer_cert); 1366 } else if ((alg_a & SSL_aECDSA) != 0 && 1367 s->session->peer_cert_type == SSL_PKEY_ECC) { 1368 pkey = X509_get0_pubkey(s->session->peer_cert); 1369 } 1370 if (pkey == NULL) { 1371 al = SSL_AD_ILLEGAL_PARAMETER; 1372 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1373 goto fatal_err; 1374 } 1375 1376 if (SSL_USE_SIGALGS(s)) { 1377 if (!CBS_get_u16(&cbs, &sigalg_value)) 1378 goto decode_err; 1379 } 1380 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1381 goto decode_err; 1382 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1383 al = SSL_AD_DECODE_ERROR; 1384 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1385 goto fatal_err; 1386 } 1387 1388 if ((sigalg = ssl_sigalg_for_peer(s, pkey, 1389 sigalg_value)) == NULL) { 1390 al = SSL_AD_DECODE_ERROR; 1391 goto fatal_err; 1392 } 1393 s->s3->hs.peer_sigalg = sigalg; 1394 1395 if (!EVP_DigestVerifyInit(md_ctx, &pctx, sigalg->md(), 1396 NULL, pkey)) 1397 goto err; 1398 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1399 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1400 RSA_PKCS1_PSS_PADDING) || 1401 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1402 goto err; 1403 if (EVP_DigestVerify(md_ctx, CBS_data(&signature), 1404 CBS_len(&signature), signed_params, signed_params_len) <= 0) { 1405 al = SSL_AD_DECRYPT_ERROR; 1406 SSLerror(s, SSL_R_BAD_SIGNATURE); 1407 goto fatal_err; 1408 } 1409 } 1410 1411 if (CBS_len(&cbs) != 0) { 1412 al = SSL_AD_DECODE_ERROR; 1413 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1414 goto fatal_err; 1415 } 1416 1417 EVP_MD_CTX_free(md_ctx); 1418 free(signed_params); 1419 1420 return (1); 1421 1422 decode_err: 1423 al = SSL_AD_DECODE_ERROR; 1424 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1425 1426 fatal_err: 1427 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1428 1429 err: 1430 CBB_cleanup(&cbb); 1431 EVP_MD_CTX_free(md_ctx); 1432 free(signed_params); 1433 1434 return (-1); 1435 } 1436 1437 static int 1438 ssl3_get_certificate_request(SSL *s) 1439 { 1440 CBS cert_request, cert_types, rdn_list; 1441 X509_NAME *xn = NULL; 1442 const unsigned char *q; 1443 STACK_OF(X509_NAME) *ca_sk = NULL; 1444 int ret; 1445 1446 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1447 SSL3_ST_CR_CERT_REQ_B, -1, s->max_cert_list)) <= 0) 1448 return ret; 1449 1450 ret = 0; 1451 1452 s->s3->hs.tls12.cert_request = 0; 1453 1454 if (s->s3->hs.tls12.message_type == SSL3_MT_SERVER_DONE) { 1455 s->s3->hs.tls12.reuse_message = 1; 1456 /* 1457 * If we get here we don't need any cached handshake records 1458 * as we wont be doing client auth. 1459 */ 1460 tls1_transcript_free(s); 1461 return (1); 1462 } 1463 1464 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1465 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1466 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1467 goto err; 1468 } 1469 1470 /* TLS does not like anon-DH with client cert */ 1471 if (s->s3->hs.cipher->algorithm_auth & SSL_aNULL) { 1472 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1473 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1474 goto err; 1475 } 1476 1477 if (s->init_num < 0) 1478 goto decode_err; 1479 CBS_init(&cert_request, s->init_msg, s->init_num); 1480 1481 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1482 SSLerror(s, ERR_R_MALLOC_FAILURE); 1483 goto err; 1484 } 1485 1486 if (!CBS_get_u8_length_prefixed(&cert_request, &cert_types)) 1487 goto decode_err; 1488 1489 if (SSL_USE_SIGALGS(s)) { 1490 CBS sigalgs; 1491 1492 if (CBS_len(&cert_request) < 2) { 1493 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1494 goto err; 1495 } 1496 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1497 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1498 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1499 goto err; 1500 } 1501 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1502 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1503 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1504 goto err; 1505 } 1506 if (!CBS_stow(&sigalgs, &s->s3->hs.sigalgs, 1507 &s->s3->hs.sigalgs_len)) 1508 goto err; 1509 } 1510 1511 /* get the CA RDNs */ 1512 if (CBS_len(&cert_request) < 2) { 1513 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1514 goto err; 1515 } 1516 1517 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1518 CBS_len(&cert_request) != 0) { 1519 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1520 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1521 goto err; 1522 } 1523 1524 while (CBS_len(&rdn_list) > 0) { 1525 CBS rdn; 1526 1527 if (CBS_len(&rdn_list) < 2) { 1528 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1529 goto err; 1530 } 1531 1532 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1533 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1534 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1535 goto err; 1536 } 1537 1538 q = CBS_data(&rdn); 1539 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1540 ssl3_send_alert(s, SSL3_AL_FATAL, 1541 SSL_AD_DECODE_ERROR); 1542 SSLerror(s, ERR_R_ASN1_LIB); 1543 goto err; 1544 } 1545 1546 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1547 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1548 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1549 goto err; 1550 } 1551 if (!sk_X509_NAME_push(ca_sk, xn)) { 1552 SSLerror(s, ERR_R_MALLOC_FAILURE); 1553 goto err; 1554 } 1555 xn = NULL; /* avoid free in err block */ 1556 } 1557 1558 /* we should setup a certificate to return.... */ 1559 s->s3->hs.tls12.cert_request = 1; 1560 sk_X509_NAME_pop_free(s->s3->hs.tls12.ca_names, X509_NAME_free); 1561 s->s3->hs.tls12.ca_names = ca_sk; 1562 ca_sk = NULL; 1563 1564 ret = 1; 1565 if (0) { 1566 decode_err: 1567 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1568 } 1569 err: 1570 X509_NAME_free(xn); 1571 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1572 return (ret); 1573 } 1574 1575 static int 1576 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1577 { 1578 return (X509_NAME_cmp(*a, *b)); 1579 } 1580 1581 static int 1582 ssl3_get_new_session_ticket(SSL *s) 1583 { 1584 uint32_t lifetime_hint; 1585 CBS cbs, session_ticket; 1586 unsigned int session_id_length = 0; 1587 int al, ret; 1588 1589 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1590 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384)) <= 0) 1591 return ret; 1592 1593 if (s->s3->hs.tls12.message_type == SSL3_MT_FINISHED) { 1594 s->s3->hs.tls12.reuse_message = 1; 1595 return (1); 1596 } 1597 if (s->s3->hs.tls12.message_type != SSL3_MT_NEWSESSION_TICKET) { 1598 al = SSL_AD_UNEXPECTED_MESSAGE; 1599 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1600 goto fatal_err; 1601 } 1602 1603 if (s->init_num < 0) { 1604 al = SSL_AD_DECODE_ERROR; 1605 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1606 goto fatal_err; 1607 } 1608 1609 CBS_init(&cbs, s->init_msg, s->init_num); 1610 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1611 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1612 CBS_len(&cbs) != 0) { 1613 al = SSL_AD_DECODE_ERROR; 1614 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1615 goto fatal_err; 1616 } 1617 s->session->tlsext_tick_lifetime_hint = lifetime_hint; 1618 1619 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1620 &s->session->tlsext_ticklen)) { 1621 SSLerror(s, ERR_R_MALLOC_FAILURE); 1622 goto err; 1623 } 1624 1625 /* 1626 * There are two ways to detect a resumed ticket session. 1627 * One is to set an appropriate session ID and then the server 1628 * must return a match in ServerHello. This allows the normal 1629 * client session ID matching to work and we know much 1630 * earlier that the ticket has been accepted. 1631 * 1632 * The other way is to set zero length session ID when the 1633 * ticket is presented and rely on the handshake to determine 1634 * session resumption. 1635 * 1636 * We choose the former approach because this fits in with 1637 * assumptions elsewhere in OpenSSL. The session ID is set 1638 * to the SHA256 hash of the ticket. 1639 */ 1640 /* XXX - ensure this doesn't overflow session_id if hash is changed. */ 1641 if (!EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1642 s->session->session_id, &session_id_length, EVP_sha256(), NULL)) { 1643 al = SSL_AD_INTERNAL_ERROR; 1644 SSLerror(s, ERR_R_EVP_LIB); 1645 goto fatal_err; 1646 } 1647 s->session->session_id_length = session_id_length; 1648 1649 return (1); 1650 1651 fatal_err: 1652 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1653 err: 1654 return (-1); 1655 } 1656 1657 static int 1658 ssl3_get_cert_status(SSL *s) 1659 { 1660 CBS cert_status, response; 1661 uint8_t status_type; 1662 int al, ret; 1663 1664 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1665 SSL3_ST_CR_CERT_STATUS_B, -1, 16384)) <= 0) 1666 return ret; 1667 1668 if (s->s3->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1669 /* 1670 * Tell the callback the server did not send us an OSCP 1671 * response, and has decided to head directly to key exchange. 1672 */ 1673 if (s->ctx->tlsext_status_cb) { 1674 free(s->tlsext_ocsp_resp); 1675 s->tlsext_ocsp_resp = NULL; 1676 s->tlsext_ocsp_resp_len = 0; 1677 1678 ret = s->ctx->tlsext_status_cb(s, 1679 s->ctx->tlsext_status_arg); 1680 if (ret == 0) { 1681 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1682 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1683 goto fatal_err; 1684 } 1685 if (ret < 0) { 1686 al = SSL_AD_INTERNAL_ERROR; 1687 SSLerror(s, ERR_R_MALLOC_FAILURE); 1688 goto fatal_err; 1689 } 1690 } 1691 s->s3->hs.tls12.reuse_message = 1; 1692 return (1); 1693 } 1694 1695 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE && 1696 s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE_STATUS) { 1697 al = SSL_AD_UNEXPECTED_MESSAGE; 1698 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1699 goto fatal_err; 1700 } 1701 1702 if (s->init_num < 0) { 1703 /* need at least status type + length */ 1704 al = SSL_AD_DECODE_ERROR; 1705 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1706 goto fatal_err; 1707 } 1708 1709 CBS_init(&cert_status, s->init_msg, s->init_num); 1710 if (!CBS_get_u8(&cert_status, &status_type) || 1711 CBS_len(&cert_status) < 3) { 1712 /* need at least status type + length */ 1713 al = SSL_AD_DECODE_ERROR; 1714 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1715 goto fatal_err; 1716 } 1717 1718 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1719 al = SSL_AD_DECODE_ERROR; 1720 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1721 goto fatal_err; 1722 } 1723 1724 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1725 CBS_len(&cert_status) != 0) { 1726 al = SSL_AD_DECODE_ERROR; 1727 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1728 goto fatal_err; 1729 } 1730 1731 if (!CBS_stow(&response, &s->tlsext_ocsp_resp, 1732 &s->tlsext_ocsp_resp_len)) { 1733 al = SSL_AD_INTERNAL_ERROR; 1734 SSLerror(s, ERR_R_MALLOC_FAILURE); 1735 goto fatal_err; 1736 } 1737 1738 if (s->ctx->tlsext_status_cb) { 1739 ret = s->ctx->tlsext_status_cb(s, 1740 s->ctx->tlsext_status_arg); 1741 if (ret == 0) { 1742 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1743 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1744 goto fatal_err; 1745 } 1746 if (ret < 0) { 1747 al = SSL_AD_INTERNAL_ERROR; 1748 SSLerror(s, ERR_R_MALLOC_FAILURE); 1749 goto fatal_err; 1750 } 1751 } 1752 return (1); 1753 fatal_err: 1754 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1755 return (-1); 1756 } 1757 1758 static int 1759 ssl3_get_server_done(SSL *s) 1760 { 1761 int ret; 1762 1763 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1764 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1765 30 /* should be very small, like 0 :-) */)) <= 0) 1766 return ret; 1767 1768 if (s->init_num != 0) { 1769 /* should contain no data */ 1770 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1771 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1772 return -1; 1773 } 1774 1775 return 1; 1776 } 1777 1778 static int 1779 ssl3_send_client_kex_rsa(SSL *s, CBB *cbb) 1780 { 1781 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1782 unsigned char *enc_pms = NULL; 1783 uint16_t max_legacy_version; 1784 EVP_PKEY *pkey; 1785 RSA *rsa; 1786 int ret = 0; 1787 int enc_len; 1788 CBB epms; 1789 1790 /* 1791 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1792 */ 1793 1794 pkey = X509_get0_pubkey(s->session->peer_cert); 1795 if (pkey == NULL || (rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) { 1796 SSLerror(s, ERR_R_INTERNAL_ERROR); 1797 goto err; 1798 } 1799 1800 /* 1801 * Our maximum legacy protocol version - while RFC 5246 section 7.4.7.1 1802 * says "The latest (newest) version supported by the client", if we're 1803 * doing RSA key exchange then we have to presume that we're talking to 1804 * a server that does not understand the supported versions extension 1805 * and therefore our maximum version is that sent in the ClientHello. 1806 */ 1807 if (!ssl_max_legacy_version(s, &max_legacy_version)) 1808 goto err; 1809 pms[0] = max_legacy_version >> 8; 1810 pms[1] = max_legacy_version & 0xff; 1811 arc4random_buf(&pms[2], sizeof(pms) - 2); 1812 1813 if ((enc_pms = malloc(RSA_size(rsa))) == NULL) { 1814 SSLerror(s, ERR_R_MALLOC_FAILURE); 1815 goto err; 1816 } 1817 1818 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, rsa, 1819 RSA_PKCS1_PADDING); 1820 if (enc_len <= 0) { 1821 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1822 goto err; 1823 } 1824 1825 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1826 goto err; 1827 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 1828 goto err; 1829 if (!CBB_flush(cbb)) 1830 goto err; 1831 1832 if (!tls12_derive_master_secret(s, pms, sizeof(pms))) 1833 goto err; 1834 1835 ret = 1; 1836 1837 err: 1838 explicit_bzero(pms, sizeof(pms)); 1839 free(enc_pms); 1840 1841 return ret; 1842 } 1843 1844 static int 1845 ssl3_send_client_kex_dhe(SSL *s, CBB *cbb) 1846 { 1847 uint8_t *key = NULL; 1848 size_t key_len = 0; 1849 int ret = 0; 1850 1851 /* Ensure that we have an ephemeral key from the server for DHE. */ 1852 if (s->s3->hs.key_share == NULL) { 1853 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1854 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1855 goto err; 1856 } 1857 1858 if (!tls_key_share_generate(s->s3->hs.key_share)) 1859 goto err; 1860 if (!tls_key_share_public(s->s3->hs.key_share, cbb)) 1861 goto err; 1862 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len)) 1863 goto err; 1864 1865 if (!tls_key_share_peer_security(s, s->s3->hs.key_share)) { 1866 SSLerror(s, SSL_R_DH_KEY_TOO_SMALL); 1867 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1868 return 0; 1869 } 1870 1871 if (!tls12_derive_master_secret(s, key, key_len)) 1872 goto err; 1873 1874 ret = 1; 1875 1876 err: 1877 freezero(key, key_len); 1878 1879 return ret; 1880 } 1881 1882 static int 1883 ssl3_send_client_kex_ecdhe(SSL *s, CBB *cbb) 1884 { 1885 uint8_t *key = NULL; 1886 size_t key_len = 0; 1887 CBB public; 1888 int ret = 0; 1889 1890 /* Ensure that we have an ephemeral key for ECDHE. */ 1891 if (s->s3->hs.key_share == NULL) { 1892 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1893 SSLerror(s, ERR_R_INTERNAL_ERROR); 1894 goto err; 1895 } 1896 1897 if (!tls_key_share_generate(s->s3->hs.key_share)) 1898 goto err; 1899 1900 if (!CBB_add_u8_length_prefixed(cbb, &public)) 1901 return 0; 1902 if (!tls_key_share_public(s->s3->hs.key_share, &public)) 1903 goto err; 1904 if (!CBB_flush(cbb)) 1905 goto err; 1906 1907 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len)) 1908 goto err; 1909 1910 if (!tls12_derive_master_secret(s, key, key_len)) 1911 goto err; 1912 1913 ret = 1; 1914 1915 err: 1916 freezero(key, key_len); 1917 1918 return ret; 1919 } 1920 1921 static int 1922 ssl3_send_client_key_exchange(SSL *s) 1923 { 1924 unsigned long alg_k; 1925 CBB cbb, kex; 1926 1927 memset(&cbb, 0, sizeof(cbb)); 1928 1929 if (s->s3->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 1930 alg_k = s->s3->hs.cipher->algorithm_mkey; 1931 1932 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 1933 SSL3_MT_CLIENT_KEY_EXCHANGE)) 1934 goto err; 1935 1936 if (alg_k & SSL_kRSA) { 1937 if (!ssl3_send_client_kex_rsa(s, &kex)) 1938 goto err; 1939 } else if (alg_k & SSL_kDHE) { 1940 if (!ssl3_send_client_kex_dhe(s, &kex)) 1941 goto err; 1942 } else if (alg_k & SSL_kECDHE) { 1943 if (!ssl3_send_client_kex_ecdhe(s, &kex)) 1944 goto err; 1945 } else { 1946 ssl3_send_alert(s, SSL3_AL_FATAL, 1947 SSL_AD_HANDSHAKE_FAILURE); 1948 SSLerror(s, ERR_R_INTERNAL_ERROR); 1949 goto err; 1950 } 1951 1952 if (!ssl3_handshake_msg_finish(s, &cbb)) 1953 goto err; 1954 1955 s->s3->hs.state = SSL3_ST_CW_KEY_EXCH_B; 1956 } 1957 1958 /* SSL3_ST_CW_KEY_EXCH_B */ 1959 return (ssl3_handshake_write(s)); 1960 1961 err: 1962 CBB_cleanup(&cbb); 1963 1964 return (-1); 1965 } 1966 1967 static int 1968 ssl3_send_client_verify_sigalgs(SSL *s, EVP_PKEY *pkey, 1969 const struct ssl_sigalg *sigalg, CBB *cert_verify) 1970 { 1971 CBB cbb_signature; 1972 EVP_PKEY_CTX *pctx = NULL; 1973 EVP_MD_CTX *mctx = NULL; 1974 const unsigned char *hdata; 1975 unsigned char *signature = NULL; 1976 size_t signature_len, hdata_len; 1977 int ret = 0; 1978 1979 if ((mctx = EVP_MD_CTX_new()) == NULL) 1980 goto err; 1981 1982 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 1983 SSLerror(s, ERR_R_INTERNAL_ERROR); 1984 goto err; 1985 } 1986 if (!EVP_DigestSignInit(mctx, &pctx, sigalg->md(), NULL, pkey)) { 1987 SSLerror(s, ERR_R_EVP_LIB); 1988 goto err; 1989 } 1990 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1991 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 1992 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 1993 SSLerror(s, ERR_R_EVP_LIB); 1994 goto err; 1995 } 1996 if (!EVP_DigestSign(mctx, NULL, &signature_len, hdata, hdata_len)) { 1997 SSLerror(s, ERR_R_EVP_LIB); 1998 goto err; 1999 } 2000 if ((signature = calloc(1, signature_len)) == NULL) { 2001 SSLerror(s, ERR_R_MALLOC_FAILURE); 2002 goto err; 2003 } 2004 if (!EVP_DigestSign(mctx, signature, &signature_len, hdata, hdata_len)) { 2005 SSLerror(s, ERR_R_EVP_LIB); 2006 goto err; 2007 } 2008 2009 if (!CBB_add_u16(cert_verify, sigalg->value)) 2010 goto err; 2011 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2012 goto err; 2013 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2014 goto err; 2015 if (!CBB_flush(cert_verify)) 2016 goto err; 2017 2018 ret = 1; 2019 2020 err: 2021 EVP_MD_CTX_free(mctx); 2022 free(signature); 2023 return ret; 2024 } 2025 2026 static int 2027 ssl3_send_client_verify_rsa(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2028 { 2029 CBB cbb_signature; 2030 RSA *rsa; 2031 unsigned char data[EVP_MAX_MD_SIZE]; 2032 unsigned char *signature = NULL; 2033 unsigned int signature_len; 2034 size_t data_len; 2035 int ret = 0; 2036 2037 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2038 goto err; 2039 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2040 goto err; 2041 if ((rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) 2042 goto err; 2043 if (RSA_sign(NID_md5_sha1, data, data_len, signature, &signature_len, 2044 rsa) <= 0 ) { 2045 SSLerror(s, ERR_R_RSA_LIB); 2046 goto err; 2047 } 2048 2049 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2050 goto err; 2051 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2052 goto err; 2053 if (!CBB_flush(cert_verify)) 2054 goto err; 2055 2056 ret = 1; 2057 err: 2058 free(signature); 2059 return ret; 2060 } 2061 2062 static int 2063 ssl3_send_client_verify_ec(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2064 { 2065 CBB cbb_signature; 2066 EC_KEY *eckey; 2067 unsigned char data[EVP_MAX_MD_SIZE]; 2068 unsigned char *signature = NULL; 2069 unsigned int signature_len; 2070 int ret = 0; 2071 2072 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2073 goto err; 2074 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2075 goto err; 2076 if ((eckey = EVP_PKEY_get0_EC_KEY(pkey)) == NULL) 2077 goto err; 2078 if (!ECDSA_sign(0, &data[MD5_DIGEST_LENGTH], SHA_DIGEST_LENGTH, 2079 signature, &signature_len, eckey)) { 2080 SSLerror(s, ERR_R_ECDSA_LIB); 2081 goto err; 2082 } 2083 2084 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2085 goto err; 2086 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2087 goto err; 2088 if (!CBB_flush(cert_verify)) 2089 goto err; 2090 2091 ret = 1; 2092 err: 2093 free(signature); 2094 return ret; 2095 } 2096 2097 static int 2098 ssl3_send_client_verify(SSL *s) 2099 { 2100 const struct ssl_sigalg *sigalg; 2101 CBB cbb, cert_verify; 2102 EVP_PKEY *pkey; 2103 2104 memset(&cbb, 0, sizeof(cbb)); 2105 2106 if (s->s3->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2107 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2108 SSL3_MT_CERTIFICATE_VERIFY)) 2109 goto err; 2110 2111 pkey = s->cert->key->privatekey; 2112 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2113 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2114 goto err; 2115 } 2116 s->s3->hs.our_sigalg = sigalg; 2117 2118 /* 2119 * For TLS v1.2 send signature algorithm and signature using 2120 * agreed digest and cached handshake records. 2121 */ 2122 if (SSL_USE_SIGALGS(s)) { 2123 if (!ssl3_send_client_verify_sigalgs(s, pkey, sigalg, 2124 &cert_verify)) 2125 goto err; 2126 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_RSA) { 2127 if (!ssl3_send_client_verify_rsa(s, pkey, &cert_verify)) 2128 goto err; 2129 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) { 2130 if (!ssl3_send_client_verify_ec(s, pkey, &cert_verify)) 2131 goto err; 2132 } else { 2133 SSLerror(s, ERR_R_INTERNAL_ERROR); 2134 goto err; 2135 } 2136 2137 tls1_transcript_free(s); 2138 2139 if (!ssl3_handshake_msg_finish(s, &cbb)) 2140 goto err; 2141 2142 s->s3->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2143 } 2144 2145 return (ssl3_handshake_write(s)); 2146 2147 err: 2148 CBB_cleanup(&cbb); 2149 2150 return (-1); 2151 } 2152 2153 static int 2154 ssl3_send_client_certificate(SSL *s) 2155 { 2156 EVP_PKEY *pkey = NULL; 2157 X509 *x509 = NULL; 2158 CBB cbb, client_cert; 2159 int i; 2160 2161 memset(&cbb, 0, sizeof(cbb)); 2162 2163 if (s->s3->hs.state == SSL3_ST_CW_CERT_A) { 2164 if (s->cert->key->x509 == NULL || 2165 s->cert->key->privatekey == NULL) 2166 s->s3->hs.state = SSL3_ST_CW_CERT_B; 2167 else 2168 s->s3->hs.state = SSL3_ST_CW_CERT_C; 2169 } 2170 2171 /* We need to get a client cert */ 2172 if (s->s3->hs.state == SSL3_ST_CW_CERT_B) { 2173 /* 2174 * If we get an error, we need to 2175 * ssl->rwstate = SSL_X509_LOOKUP; return(-1); 2176 * We then get retried later. 2177 */ 2178 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2179 if (i < 0) { 2180 s->rwstate = SSL_X509_LOOKUP; 2181 return (-1); 2182 } 2183 s->rwstate = SSL_NOTHING; 2184 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2185 s->s3->hs.state = SSL3_ST_CW_CERT_B; 2186 if (!SSL_use_certificate(s, x509) || 2187 !SSL_use_PrivateKey(s, pkey)) 2188 i = 0; 2189 } else if (i == 1) { 2190 i = 0; 2191 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2192 } 2193 2194 X509_free(x509); 2195 EVP_PKEY_free(pkey); 2196 if (i == 0) { 2197 s->s3->hs.tls12.cert_request = 2; 2198 2199 /* There is no client certificate to verify. */ 2200 tls1_transcript_free(s); 2201 } 2202 2203 /* Ok, we have a cert */ 2204 s->s3->hs.state = SSL3_ST_CW_CERT_C; 2205 } 2206 2207 if (s->s3->hs.state == SSL3_ST_CW_CERT_C) { 2208 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2209 SSL3_MT_CERTIFICATE)) 2210 goto err; 2211 if (!ssl3_output_cert_chain(s, &client_cert, 2212 (s->s3->hs.tls12.cert_request == 2) ? NULL : s->cert->key)) 2213 goto err; 2214 if (!ssl3_handshake_msg_finish(s, &cbb)) 2215 goto err; 2216 2217 s->s3->hs.state = SSL3_ST_CW_CERT_D; 2218 } 2219 2220 /* SSL3_ST_CW_CERT_D */ 2221 return (ssl3_handshake_write(s)); 2222 2223 err: 2224 CBB_cleanup(&cbb); 2225 2226 return (0); 2227 } 2228 2229 #define has_bits(i,m) (((i)&(m)) == (m)) 2230 2231 static int 2232 ssl3_check_cert_and_algorithm(SSL *s) 2233 { 2234 long alg_k, alg_a; 2235 int nid = NID_undef; 2236 int i; 2237 2238 alg_k = s->s3->hs.cipher->algorithm_mkey; 2239 alg_a = s->s3->hs.cipher->algorithm_auth; 2240 2241 /* We don't have a certificate. */ 2242 if (alg_a & SSL_aNULL) 2243 return (1); 2244 2245 if (s->s3->hs.key_share != NULL) 2246 nid = tls_key_share_nid(s->s3->hs.key_share); 2247 2248 /* This is the passed certificate. */ 2249 2250 if (s->session->peer_cert_type == SSL_PKEY_ECC) { 2251 if (!ssl_check_srvr_ecc_cert_and_alg(s, s->session->peer_cert)) { 2252 SSLerror(s, SSL_R_BAD_ECC_CERT); 2253 goto fatal_err; 2254 } 2255 return (1); 2256 } 2257 2258 i = X509_certificate_type(s->session->peer_cert, NULL); 2259 2260 /* Check that we have a certificate if we require one. */ 2261 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2262 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2263 goto fatal_err; 2264 } 2265 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2266 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2267 goto fatal_err; 2268 } 2269 if ((alg_k & SSL_kDHE) && 2270 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (nid == NID_dhKeyAgreement))) { 2271 SSLerror(s, SSL_R_MISSING_DH_KEY); 2272 goto fatal_err; 2273 } 2274 2275 return (1); 2276 2277 fatal_err: 2278 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2279 2280 return (0); 2281 } 2282 2283 /* 2284 * Check to see if handshake is full or resumed. Usually this is just a 2285 * case of checking to see if a cache hit has occurred. In the case of 2286 * session tickets we have to check the next message to be sure. 2287 */ 2288 2289 static int 2290 ssl3_check_finished(SSL *s) 2291 { 2292 int ret; 2293 2294 /* If we have no ticket it cannot be a resumed session. */ 2295 if (!s->session->tlsext_tick) 2296 return (1); 2297 /* this function is called when we really expect a Certificate 2298 * message, so permit appropriate message length */ 2299 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2300 SSL3_ST_CR_CERT_B, -1, s->max_cert_list)) <= 0) 2301 return ret; 2302 2303 s->s3->hs.tls12.reuse_message = 1; 2304 if ((s->s3->hs.tls12.message_type == SSL3_MT_FINISHED) || 2305 (s->s3->hs.tls12.message_type == SSL3_MT_NEWSESSION_TICKET)) 2306 return (2); 2307 2308 return (1); 2309 } 2310 2311 static int 2312 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2313 { 2314 if (s->ctx->client_cert_cb == NULL) 2315 return 0; 2316 2317 return s->ctx->client_cert_cb(s, px509, ppkey); 2318 } 2319 2320 static int 2321 ssl3_send_client_change_cipher_spec(SSL *s) 2322 { 2323 size_t outlen; 2324 CBB cbb; 2325 2326 memset(&cbb, 0, sizeof(cbb)); 2327 2328 if (s->s3->hs.state == SSL3_ST_CW_CHANGE_A) { 2329 if (!CBB_init_fixed(&cbb, s->init_buf->data, 2330 s->init_buf->length)) 2331 goto err; 2332 if (!CBB_add_u8(&cbb, SSL3_MT_CCS)) 2333 goto err; 2334 if (!CBB_finish(&cbb, NULL, &outlen)) 2335 goto err; 2336 2337 if (outlen > INT_MAX) 2338 goto err; 2339 2340 s->init_num = (int)outlen; 2341 s->init_off = 0; 2342 2343 if (SSL_is_dtls(s)) { 2344 s->d1->handshake_write_seq = 2345 s->d1->next_handshake_write_seq; 2346 dtls1_set_message_header_int(s, SSL3_MT_CCS, 0, 2347 s->d1->handshake_write_seq, 0, 0); 2348 dtls1_buffer_message(s, 1); 2349 } 2350 2351 s->s3->hs.state = SSL3_ST_CW_CHANGE_B; 2352 } 2353 2354 /* SSL3_ST_CW_CHANGE_B */ 2355 return ssl3_record_write(s, SSL3_RT_CHANGE_CIPHER_SPEC); 2356 2357 err: 2358 CBB_cleanup(&cbb); 2359 2360 return -1; 2361 } 2362 2363 static int 2364 ssl3_send_client_finished(SSL *s) 2365 { 2366 CBB cbb, finished; 2367 2368 memset(&cbb, 0, sizeof(cbb)); 2369 2370 if (s->s3->hs.state == SSL3_ST_CW_FINISHED_A) { 2371 if (!tls12_derive_finished(s)) 2372 goto err; 2373 2374 /* Copy finished so we can use it for renegotiation checks. */ 2375 memcpy(s->s3->previous_client_finished, 2376 s->s3->hs.finished, s->s3->hs.finished_len); 2377 s->s3->previous_client_finished_len = 2378 s->s3->hs.finished_len; 2379 2380 if (!ssl3_handshake_msg_start(s, &cbb, &finished, 2381 SSL3_MT_FINISHED)) 2382 goto err; 2383 if (!CBB_add_bytes(&finished, s->s3->hs.finished, 2384 s->s3->hs.finished_len)) 2385 goto err; 2386 if (!ssl3_handshake_msg_finish(s, &cbb)) 2387 goto err; 2388 2389 s->s3->hs.state = SSL3_ST_CW_FINISHED_B; 2390 } 2391 2392 return (ssl3_handshake_write(s)); 2393 2394 err: 2395 CBB_cleanup(&cbb); 2396 2397 return (-1); 2398 } 2399 2400 static int 2401 ssl3_get_server_finished(SSL *s) 2402 { 2403 int al, md_len, ret; 2404 CBS cbs; 2405 2406 /* should actually be 36+4 :-) */ 2407 if ((ret = ssl3_get_message(s, SSL3_ST_CR_FINISHED_A, 2408 SSL3_ST_CR_FINISHED_B, SSL3_MT_FINISHED, 64)) <= 0) 2409 return ret; 2410 2411 /* If this occurs, we have missed a message */ 2412 if (!s->s3->change_cipher_spec) { 2413 al = SSL_AD_UNEXPECTED_MESSAGE; 2414 SSLerror(s, SSL_R_GOT_A_FIN_BEFORE_A_CCS); 2415 goto fatal_err; 2416 } 2417 s->s3->change_cipher_spec = 0; 2418 2419 md_len = TLS1_FINISH_MAC_LENGTH; 2420 2421 if (s->init_num < 0) { 2422 al = SSL_AD_DECODE_ERROR; 2423 SSLerror(s, SSL_R_BAD_DIGEST_LENGTH); 2424 goto fatal_err; 2425 } 2426 2427 CBS_init(&cbs, s->init_msg, s->init_num); 2428 2429 if (s->s3->hs.peer_finished_len != md_len || 2430 CBS_len(&cbs) != md_len) { 2431 al = SSL_AD_DECODE_ERROR; 2432 SSLerror(s, SSL_R_BAD_DIGEST_LENGTH); 2433 goto fatal_err; 2434 } 2435 2436 if (!CBS_mem_equal(&cbs, s->s3->hs.peer_finished, CBS_len(&cbs))) { 2437 al = SSL_AD_DECRYPT_ERROR; 2438 SSLerror(s, SSL_R_DIGEST_CHECK_FAILED); 2439 goto fatal_err; 2440 } 2441 2442 /* Copy finished so we can use it for renegotiation checks. */ 2443 OPENSSL_assert(md_len <= EVP_MAX_MD_SIZE); 2444 memcpy(s->s3->previous_server_finished, 2445 s->s3->hs.peer_finished, md_len); 2446 s->s3->previous_server_finished_len = md_len; 2447 2448 return (1); 2449 fatal_err: 2450 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2451 return (0); 2452 } 2453