1 /* $OpenBSD: ssl_clnt.c,v 1.168 2024/07/22 14:47:15 jsing Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 /* ==================================================================== 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 /* ==================================================================== 112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 113 * 114 * Portions of the attached software ("Contribution") are developed by 115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 116 * 117 * The Contribution is licensed pursuant to the OpenSSL open source 118 * license provided above. 119 * 120 * ECC cipher suite support in OpenSSL originally written by 121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. 122 * 123 */ 124 /* ==================================================================== 125 * Copyright 2005 Nokia. All rights reserved. 126 * 127 * The portions of the attached software ("Contribution") is developed by 128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 129 * license. 130 * 131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 133 * support (see RFC 4279) to OpenSSL. 134 * 135 * No patent licenses or other rights except those expressly stated in 136 * the OpenSSL open source license shall be deemed granted or received 137 * expressly, by implication, estoppel, or otherwise. 138 * 139 * No assurances are provided by Nokia that the Contribution does not 140 * infringe the patent or other intellectual property rights of any third 141 * party or that the license provides you with all the necessary rights 142 * to make use of the Contribution. 143 * 144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 148 * OTHERWISE. 149 */ 150 151 #include <limits.h> 152 #include <stdint.h> 153 #include <stdio.h> 154 155 #include <openssl/bn.h> 156 #include <openssl/buffer.h> 157 #include <openssl/curve25519.h> 158 #include <openssl/dh.h> 159 #include <openssl/evp.h> 160 #include <openssl/md5.h> 161 #include <openssl/objects.h> 162 #include <openssl/opensslconf.h> 163 164 #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_value = s->s3->hs.cipher->value; 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 /* 945 * XXX - this appears to be completely broken. The 946 * client cannot change the cipher at this stage, 947 * as the server has already made a selection. 948 */ 949 if ((s->s3->hs.cipher = pref_cipher) == NULL) 950 s->s3->hs.cipher = 951 ssl3_get_cipher_by_value(cipher_suite); 952 s->s3->flags |= SSL3_FLAGS_CCS_OK; 953 } 954 955 if (s->session->session_id_length != 0 && 956 CBS_mem_equal(&session_id, s->session->session_id, 957 s->session->session_id_length)) { 958 if (s->sid_ctx_length != s->session->sid_ctx_length || 959 timingsafe_memcmp(s->session->sid_ctx, 960 s->sid_ctx, s->sid_ctx_length) != 0) { 961 /* actually a client application bug */ 962 al = SSL_AD_ILLEGAL_PARAMETER; 963 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 964 goto fatal_err; 965 } 966 s->s3->flags |= SSL3_FLAGS_CCS_OK; 967 s->hit = 1; 968 } else { 969 /* a miss or crap from the other end */ 970 971 /* If we were trying for session-id reuse, make a new 972 * SSL_SESSION so we don't stuff up other people */ 973 s->hit = 0; 974 if (s->session->session_id_length > 0) { 975 if (!ssl_get_new_session(s, 0)) { 976 al = SSL_AD_INTERNAL_ERROR; 977 goto fatal_err; 978 } 979 } 980 981 /* 982 * XXX - improve the handling for the case where there is a 983 * zero length session identifier. 984 */ 985 if (!CBS_write_bytes(&session_id, s->session->session_id, 986 sizeof(s->session->session_id), 987 &s->session->session_id_length)) 988 goto err; 989 990 s->session->ssl_version = s->version; 991 } 992 993 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 994 al = SSL_AD_ILLEGAL_PARAMETER; 995 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 996 goto fatal_err; 997 } 998 999 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 1000 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 1001 s->s3->hs.negotiated_tls_version < TLS1_2_VERSION) { 1002 al = SSL_AD_ILLEGAL_PARAMETER; 1003 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1004 goto fatal_err; 1005 } 1006 1007 if (!ssl_cipher_in_list(SSL_get_ciphers(s), cipher)) { 1008 /* we did not say we would use this cipher */ 1009 al = SSL_AD_ILLEGAL_PARAMETER; 1010 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1011 goto fatal_err; 1012 } 1013 1014 /* 1015 * Depending on the session caching (internal/external), the cipher 1016 * and/or cipher_id values may not be set. Make sure that 1017 * cipher_id is set and use it for comparison. 1018 */ 1019 if (s->hit && (s->session->cipher_value != cipher->value)) { 1020 al = SSL_AD_ILLEGAL_PARAMETER; 1021 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1022 goto fatal_err; 1023 } 1024 s->s3->hs.cipher = cipher; 1025 s->session->cipher_value = cipher->value; 1026 1027 if (!tls1_transcript_hash_init(s)) 1028 goto err; 1029 1030 /* 1031 * Don't digest cached records if no sigalgs: we may need them for 1032 * client authentication. 1033 */ 1034 if (!SSL_USE_SIGALGS(s)) 1035 tls1_transcript_free(s); 1036 1037 if (!CBS_get_u8(&cbs, &compression_method)) 1038 goto decode_err; 1039 1040 if (compression_method != 0) { 1041 al = SSL_AD_ILLEGAL_PARAMETER; 1042 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1043 goto fatal_err; 1044 } 1045 1046 if (!tlsext_client_parse(s, SSL_TLSEXT_MSG_SH, &cbs, &al)) { 1047 SSLerror(s, SSL_R_PARSE_TLSEXT); 1048 goto fatal_err; 1049 } 1050 1051 if (CBS_len(&cbs) != 0) 1052 goto decode_err; 1053 1054 /* 1055 * Determine if we need to see RI. Strictly speaking if we want to 1056 * avoid an attack we should *always* see RI even on initial server 1057 * hello because the client doesn't see any renegotiation during an 1058 * attack. However this would mean we could not connect to any server 1059 * which doesn't support RI so for the immediate future tolerate RI 1060 * absence on initial connect only. 1061 */ 1062 if (!s->s3->renegotiate_seen && 1063 !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1064 al = SSL_AD_HANDSHAKE_FAILURE; 1065 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1066 goto fatal_err; 1067 } 1068 1069 if (ssl_check_serverhello_tlsext(s) <= 0) { 1070 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1071 goto err; 1072 } 1073 1074 return (1); 1075 1076 decode_err: 1077 /* wrong packet length */ 1078 al = SSL_AD_DECODE_ERROR; 1079 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1080 fatal_err: 1081 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1082 err: 1083 return (-1); 1084 } 1085 1086 static int 1087 ssl3_get_server_certificate(SSL *s) 1088 { 1089 CBS cbs, cert_list, cert_data; 1090 STACK_OF(X509) *certs = NULL; 1091 X509 *cert = NULL; 1092 const uint8_t *p; 1093 int al, ret; 1094 1095 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1096 SSL3_ST_CR_CERT_B, -1, s->max_cert_list)) <= 0) 1097 return ret; 1098 1099 ret = -1; 1100 1101 if (s->s3->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1102 s->s3->hs.tls12.reuse_message = 1; 1103 return (1); 1104 } 1105 1106 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE) { 1107 al = SSL_AD_UNEXPECTED_MESSAGE; 1108 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1109 goto fatal_err; 1110 } 1111 1112 if ((certs = sk_X509_new_null()) == NULL) { 1113 SSLerror(s, ERR_R_MALLOC_FAILURE); 1114 goto err; 1115 } 1116 1117 if (s->init_num < 0) 1118 goto decode_err; 1119 1120 CBS_init(&cbs, s->init_msg, s->init_num); 1121 1122 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list)) 1123 goto decode_err; 1124 if (CBS_len(&cbs) != 0) 1125 goto decode_err; 1126 1127 while (CBS_len(&cert_list) > 0) { 1128 if (!CBS_get_u24_length_prefixed(&cert_list, &cert_data)) 1129 goto decode_err; 1130 p = CBS_data(&cert_data); 1131 if ((cert = d2i_X509(NULL, &p, CBS_len(&cert_data))) == NULL) { 1132 al = SSL_AD_BAD_CERTIFICATE; 1133 SSLerror(s, ERR_R_ASN1_LIB); 1134 goto fatal_err; 1135 } 1136 if (p != CBS_data(&cert_data) + CBS_len(&cert_data)) 1137 goto decode_err; 1138 if (!sk_X509_push(certs, cert)) { 1139 SSLerror(s, ERR_R_MALLOC_FAILURE); 1140 goto err; 1141 } 1142 cert = NULL; 1143 } 1144 1145 /* A server must always provide a non-empty certificate list. */ 1146 if (sk_X509_num(certs) < 1) { 1147 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 1148 goto decode_err; 1149 } 1150 1151 if (ssl_verify_cert_chain(s, certs) <= 0 && 1152 s->verify_mode != SSL_VERIFY_NONE) { 1153 al = ssl_verify_alarm_type(s->verify_result); 1154 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1155 goto fatal_err; 1156 } 1157 s->session->verify_result = s->verify_result; 1158 ERR_clear_error(); 1159 1160 if (!tls_process_peer_certs(s, certs)) 1161 goto err; 1162 1163 ret = 1; 1164 1165 if (0) { 1166 decode_err: 1167 /* wrong packet length */ 1168 al = SSL_AD_DECODE_ERROR; 1169 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1170 fatal_err: 1171 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1172 } 1173 err: 1174 sk_X509_pop_free(certs, X509_free); 1175 X509_free(cert); 1176 1177 return (ret); 1178 } 1179 1180 static int 1181 ssl3_get_server_kex_dhe(SSL *s, CBS *cbs) 1182 { 1183 int decode_error, invalid_params, invalid_key; 1184 int nid = NID_dhKeyAgreement; 1185 1186 tls_key_share_free(s->s3->hs.key_share); 1187 if ((s->s3->hs.key_share = tls_key_share_new_nid(nid)) == NULL) 1188 goto err; 1189 1190 if (!tls_key_share_peer_params(s->s3->hs.key_share, cbs, 1191 &decode_error, &invalid_params)) { 1192 if (decode_error) { 1193 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1194 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1195 } 1196 goto err; 1197 } 1198 if (!tls_key_share_peer_public(s->s3->hs.key_share, cbs, 1199 &decode_error, &invalid_key)) { 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 1207 if (invalid_params) { 1208 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1209 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1210 goto err; 1211 } 1212 if (invalid_key) { 1213 SSLerror(s, SSL_R_BAD_DH_PUB_KEY_LENGTH); 1214 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1215 goto err; 1216 } 1217 1218 if (!tls_key_share_peer_security(s, s->s3->hs.key_share)) { 1219 SSLerror(s, SSL_R_DH_KEY_TOO_SMALL); 1220 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1221 return 0; 1222 } 1223 1224 return 1; 1225 1226 err: 1227 return 0; 1228 } 1229 1230 static int 1231 ssl3_get_server_kex_ecdhe(SSL *s, CBS *cbs) 1232 { 1233 uint8_t curve_type; 1234 uint16_t group_id; 1235 int decode_error; 1236 CBS public; 1237 1238 if (!CBS_get_u8(cbs, &curve_type)) 1239 goto decode_err; 1240 if (!CBS_get_u16(cbs, &group_id)) 1241 goto decode_err; 1242 1243 /* Only named curves are supported. */ 1244 if (curve_type != NAMED_CURVE_TYPE) { 1245 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1246 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1247 goto err; 1248 } 1249 1250 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1251 goto decode_err; 1252 1253 /* 1254 * Check that the group is one of our preferences - if it is not, 1255 * the server has sent us an invalid group. 1256 */ 1257 if (!tls1_check_group(s, group_id)) { 1258 SSLerror(s, SSL_R_WRONG_CURVE); 1259 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1260 goto err; 1261 } 1262 1263 tls_key_share_free(s->s3->hs.key_share); 1264 if ((s->s3->hs.key_share = tls_key_share_new(group_id)) == NULL) 1265 goto err; 1266 1267 if (!tls_key_share_peer_public(s->s3->hs.key_share, &public, 1268 &decode_error, NULL)) { 1269 if (decode_error) 1270 goto decode_err; 1271 goto err; 1272 } 1273 1274 return 1; 1275 1276 decode_err: 1277 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1278 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1279 err: 1280 return 0; 1281 } 1282 1283 static int 1284 ssl3_get_server_key_exchange(SSL *s) 1285 { 1286 CBB cbb; 1287 CBS cbs, params, signature; 1288 EVP_MD_CTX *md_ctx; 1289 unsigned char *signed_params = NULL; 1290 size_t signed_params_len; 1291 size_t params_len; 1292 long alg_k, alg_a; 1293 int al, ret; 1294 1295 memset(&cbb, 0, sizeof(cbb)); 1296 1297 alg_k = s->s3->hs.cipher->algorithm_mkey; 1298 alg_a = s->s3->hs.cipher->algorithm_auth; 1299 1300 /* 1301 * Use same message size as in ssl3_get_certificate_request() 1302 * as ServerKeyExchange message may be skipped. 1303 */ 1304 if ((ret = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1305 SSL3_ST_CR_KEY_EXCH_B, -1, s->max_cert_list)) <= 0) 1306 return ret; 1307 1308 if ((md_ctx = EVP_MD_CTX_new()) == NULL) 1309 goto err; 1310 1311 if (s->init_num < 0) 1312 goto err; 1313 1314 CBS_init(&cbs, s->init_msg, s->init_num); 1315 1316 if (s->s3->hs.tls12.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1317 /* 1318 * Do not skip server key exchange if this cipher suite uses 1319 * ephemeral keys. 1320 */ 1321 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1322 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1323 al = SSL_AD_UNEXPECTED_MESSAGE; 1324 goto fatal_err; 1325 } 1326 1327 s->s3->hs.tls12.reuse_message = 1; 1328 EVP_MD_CTX_free(md_ctx); 1329 return (1); 1330 } 1331 1332 if (!CBB_init(&cbb, 0)) 1333 goto err; 1334 if (!CBB_add_bytes(&cbb, s->s3->client_random, SSL3_RANDOM_SIZE)) 1335 goto err; 1336 if (!CBB_add_bytes(&cbb, s->s3->server_random, SSL3_RANDOM_SIZE)) 1337 goto err; 1338 1339 CBS_dup(&cbs, ¶ms); 1340 1341 if (alg_k & SSL_kDHE) { 1342 if (!ssl3_get_server_kex_dhe(s, &cbs)) 1343 goto err; 1344 } else if (alg_k & SSL_kECDHE) { 1345 if (!ssl3_get_server_kex_ecdhe(s, &cbs)) 1346 goto err; 1347 } else if (alg_k != 0) { 1348 al = SSL_AD_UNEXPECTED_MESSAGE; 1349 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1350 goto fatal_err; 1351 } 1352 1353 if ((params_len = CBS_offset(&cbs)) > CBS_len(¶ms)) 1354 goto err; 1355 if (!CBB_add_bytes(&cbb, CBS_data(¶ms), params_len)) 1356 goto err; 1357 if (!CBB_finish(&cbb, &signed_params, &signed_params_len)) 1358 goto err; 1359 1360 /* if it was signed, check the signature */ 1361 if ((alg_a & SSL_aNULL) == 0) { 1362 uint16_t sigalg_value = SIGALG_NONE; 1363 const struct ssl_sigalg *sigalg; 1364 EVP_PKEY_CTX *pctx; 1365 EVP_PKEY *pkey = NULL; 1366 1367 if ((alg_a & SSL_aRSA) != 0 && 1368 s->session->peer_cert_type == SSL_PKEY_RSA) { 1369 pkey = X509_get0_pubkey(s->session->peer_cert); 1370 } else if ((alg_a & SSL_aECDSA) != 0 && 1371 s->session->peer_cert_type == SSL_PKEY_ECC) { 1372 pkey = X509_get0_pubkey(s->session->peer_cert); 1373 } 1374 if (pkey == NULL) { 1375 al = SSL_AD_ILLEGAL_PARAMETER; 1376 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1377 goto fatal_err; 1378 } 1379 1380 if (SSL_USE_SIGALGS(s)) { 1381 if (!CBS_get_u16(&cbs, &sigalg_value)) 1382 goto decode_err; 1383 } 1384 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1385 goto decode_err; 1386 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1387 al = SSL_AD_DECODE_ERROR; 1388 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1389 goto fatal_err; 1390 } 1391 1392 if ((sigalg = ssl_sigalg_for_peer(s, pkey, 1393 sigalg_value)) == NULL) { 1394 al = SSL_AD_DECODE_ERROR; 1395 goto fatal_err; 1396 } 1397 s->s3->hs.peer_sigalg = sigalg; 1398 1399 if (!EVP_DigestVerifyInit(md_ctx, &pctx, sigalg->md(), 1400 NULL, pkey)) 1401 goto err; 1402 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1403 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1404 RSA_PKCS1_PSS_PADDING) || 1405 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1406 goto err; 1407 if (EVP_DigestVerify(md_ctx, CBS_data(&signature), 1408 CBS_len(&signature), signed_params, signed_params_len) <= 0) { 1409 al = SSL_AD_DECRYPT_ERROR; 1410 SSLerror(s, SSL_R_BAD_SIGNATURE); 1411 goto fatal_err; 1412 } 1413 } 1414 1415 if (CBS_len(&cbs) != 0) { 1416 al = SSL_AD_DECODE_ERROR; 1417 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1418 goto fatal_err; 1419 } 1420 1421 EVP_MD_CTX_free(md_ctx); 1422 free(signed_params); 1423 1424 return (1); 1425 1426 decode_err: 1427 al = SSL_AD_DECODE_ERROR; 1428 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1429 1430 fatal_err: 1431 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1432 1433 err: 1434 CBB_cleanup(&cbb); 1435 EVP_MD_CTX_free(md_ctx); 1436 free(signed_params); 1437 1438 return (-1); 1439 } 1440 1441 static int 1442 ssl3_get_certificate_request(SSL *s) 1443 { 1444 CBS cert_request, cert_types, rdn_list; 1445 X509_NAME *xn = NULL; 1446 const unsigned char *q; 1447 STACK_OF(X509_NAME) *ca_sk = NULL; 1448 int ret; 1449 1450 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1451 SSL3_ST_CR_CERT_REQ_B, -1, s->max_cert_list)) <= 0) 1452 return ret; 1453 1454 ret = 0; 1455 1456 s->s3->hs.tls12.cert_request = 0; 1457 1458 if (s->s3->hs.tls12.message_type == SSL3_MT_SERVER_DONE) { 1459 s->s3->hs.tls12.reuse_message = 1; 1460 /* 1461 * If we get here we don't need any cached handshake records 1462 * as we wont be doing client auth. 1463 */ 1464 tls1_transcript_free(s); 1465 return (1); 1466 } 1467 1468 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1469 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1470 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1471 goto err; 1472 } 1473 1474 /* TLS does not like anon-DH with client cert */ 1475 if (s->s3->hs.cipher->algorithm_auth & SSL_aNULL) { 1476 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1477 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1478 goto err; 1479 } 1480 1481 if (s->init_num < 0) 1482 goto decode_err; 1483 CBS_init(&cert_request, s->init_msg, s->init_num); 1484 1485 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1486 SSLerror(s, ERR_R_MALLOC_FAILURE); 1487 goto err; 1488 } 1489 1490 if (!CBS_get_u8_length_prefixed(&cert_request, &cert_types)) 1491 goto decode_err; 1492 1493 if (SSL_USE_SIGALGS(s)) { 1494 CBS sigalgs; 1495 1496 if (CBS_len(&cert_request) < 2) { 1497 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1498 goto err; 1499 } 1500 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1501 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1502 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1503 goto err; 1504 } 1505 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1506 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1507 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1508 goto err; 1509 } 1510 if (!CBS_stow(&sigalgs, &s->s3->hs.sigalgs, 1511 &s->s3->hs.sigalgs_len)) 1512 goto err; 1513 } 1514 1515 /* get the CA RDNs */ 1516 if (CBS_len(&cert_request) < 2) { 1517 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1518 goto err; 1519 } 1520 1521 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1522 CBS_len(&cert_request) != 0) { 1523 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1524 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1525 goto err; 1526 } 1527 1528 while (CBS_len(&rdn_list) > 0) { 1529 CBS rdn; 1530 1531 if (CBS_len(&rdn_list) < 2) { 1532 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1533 goto err; 1534 } 1535 1536 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1537 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1538 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1539 goto err; 1540 } 1541 1542 q = CBS_data(&rdn); 1543 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1544 ssl3_send_alert(s, SSL3_AL_FATAL, 1545 SSL_AD_DECODE_ERROR); 1546 SSLerror(s, ERR_R_ASN1_LIB); 1547 goto err; 1548 } 1549 1550 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1551 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1552 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1553 goto err; 1554 } 1555 if (!sk_X509_NAME_push(ca_sk, xn)) { 1556 SSLerror(s, ERR_R_MALLOC_FAILURE); 1557 goto err; 1558 } 1559 xn = NULL; /* avoid free in err block */ 1560 } 1561 1562 /* we should setup a certificate to return.... */ 1563 s->s3->hs.tls12.cert_request = 1; 1564 sk_X509_NAME_pop_free(s->s3->hs.tls12.ca_names, X509_NAME_free); 1565 s->s3->hs.tls12.ca_names = ca_sk; 1566 ca_sk = NULL; 1567 1568 ret = 1; 1569 if (0) { 1570 decode_err: 1571 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1572 } 1573 err: 1574 X509_NAME_free(xn); 1575 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1576 return (ret); 1577 } 1578 1579 static int 1580 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1581 { 1582 return (X509_NAME_cmp(*a, *b)); 1583 } 1584 1585 static int 1586 ssl3_get_new_session_ticket(SSL *s) 1587 { 1588 uint32_t lifetime_hint; 1589 CBS cbs, session_ticket; 1590 unsigned int session_id_length = 0; 1591 int al, ret; 1592 1593 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1594 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384)) <= 0) 1595 return ret; 1596 1597 if (s->s3->hs.tls12.message_type == SSL3_MT_FINISHED) { 1598 s->s3->hs.tls12.reuse_message = 1; 1599 return (1); 1600 } 1601 if (s->s3->hs.tls12.message_type != SSL3_MT_NEWSESSION_TICKET) { 1602 al = SSL_AD_UNEXPECTED_MESSAGE; 1603 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1604 goto fatal_err; 1605 } 1606 1607 if (s->init_num < 0) { 1608 al = SSL_AD_DECODE_ERROR; 1609 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1610 goto fatal_err; 1611 } 1612 1613 CBS_init(&cbs, s->init_msg, s->init_num); 1614 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1615 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1616 CBS_len(&cbs) != 0) { 1617 al = SSL_AD_DECODE_ERROR; 1618 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1619 goto fatal_err; 1620 } 1621 s->session->tlsext_tick_lifetime_hint = lifetime_hint; 1622 1623 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1624 &s->session->tlsext_ticklen)) { 1625 SSLerror(s, ERR_R_MALLOC_FAILURE); 1626 goto err; 1627 } 1628 1629 /* 1630 * There are two ways to detect a resumed ticket session. 1631 * One is to set an appropriate session ID and then the server 1632 * must return a match in ServerHello. This allows the normal 1633 * client session ID matching to work and we know much 1634 * earlier that the ticket has been accepted. 1635 * 1636 * The other way is to set zero length session ID when the 1637 * ticket is presented and rely on the handshake to determine 1638 * session resumption. 1639 * 1640 * We choose the former approach because this fits in with 1641 * assumptions elsewhere in OpenSSL. The session ID is set 1642 * to the SHA256 hash of the ticket. 1643 */ 1644 /* XXX - ensure this doesn't overflow session_id if hash is changed. */ 1645 if (!EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1646 s->session->session_id, &session_id_length, EVP_sha256(), NULL)) { 1647 al = SSL_AD_INTERNAL_ERROR; 1648 SSLerror(s, ERR_R_EVP_LIB); 1649 goto fatal_err; 1650 } 1651 s->session->session_id_length = session_id_length; 1652 1653 return (1); 1654 1655 fatal_err: 1656 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1657 err: 1658 return (-1); 1659 } 1660 1661 static int 1662 ssl3_get_cert_status(SSL *s) 1663 { 1664 CBS cert_status, response; 1665 uint8_t status_type; 1666 int al, ret; 1667 1668 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1669 SSL3_ST_CR_CERT_STATUS_B, -1, 16384)) <= 0) 1670 return ret; 1671 1672 if (s->s3->hs.tls12.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1673 /* 1674 * Tell the callback the server did not send us an OSCP 1675 * response, and has decided to head directly to key exchange. 1676 */ 1677 if (s->ctx->tlsext_status_cb) { 1678 free(s->tlsext_ocsp_resp); 1679 s->tlsext_ocsp_resp = NULL; 1680 s->tlsext_ocsp_resp_len = 0; 1681 1682 ret = s->ctx->tlsext_status_cb(s, 1683 s->ctx->tlsext_status_arg); 1684 if (ret == 0) { 1685 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1686 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1687 goto fatal_err; 1688 } 1689 if (ret < 0) { 1690 al = SSL_AD_INTERNAL_ERROR; 1691 SSLerror(s, ERR_R_MALLOC_FAILURE); 1692 goto fatal_err; 1693 } 1694 } 1695 s->s3->hs.tls12.reuse_message = 1; 1696 return (1); 1697 } 1698 1699 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE && 1700 s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE_STATUS) { 1701 al = SSL_AD_UNEXPECTED_MESSAGE; 1702 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1703 goto fatal_err; 1704 } 1705 1706 if (s->init_num < 0) { 1707 /* need at least status type + length */ 1708 al = SSL_AD_DECODE_ERROR; 1709 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1710 goto fatal_err; 1711 } 1712 1713 CBS_init(&cert_status, s->init_msg, s->init_num); 1714 if (!CBS_get_u8(&cert_status, &status_type) || 1715 CBS_len(&cert_status) < 3) { 1716 /* need at least status type + length */ 1717 al = SSL_AD_DECODE_ERROR; 1718 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1719 goto fatal_err; 1720 } 1721 1722 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1723 al = SSL_AD_DECODE_ERROR; 1724 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1725 goto fatal_err; 1726 } 1727 1728 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1729 CBS_len(&cert_status) != 0) { 1730 al = SSL_AD_DECODE_ERROR; 1731 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1732 goto fatal_err; 1733 } 1734 1735 if (!CBS_stow(&response, &s->tlsext_ocsp_resp, 1736 &s->tlsext_ocsp_resp_len)) { 1737 al = SSL_AD_INTERNAL_ERROR; 1738 SSLerror(s, ERR_R_MALLOC_FAILURE); 1739 goto fatal_err; 1740 } 1741 1742 if (s->ctx->tlsext_status_cb) { 1743 ret = s->ctx->tlsext_status_cb(s, 1744 s->ctx->tlsext_status_arg); 1745 if (ret == 0) { 1746 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1747 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1748 goto fatal_err; 1749 } 1750 if (ret < 0) { 1751 al = SSL_AD_INTERNAL_ERROR; 1752 SSLerror(s, ERR_R_MALLOC_FAILURE); 1753 goto fatal_err; 1754 } 1755 } 1756 return (1); 1757 fatal_err: 1758 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1759 return (-1); 1760 } 1761 1762 static int 1763 ssl3_get_server_done(SSL *s) 1764 { 1765 int ret; 1766 1767 if ((ret = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1768 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1769 30 /* should be very small, like 0 :-) */)) <= 0) 1770 return ret; 1771 1772 if (s->init_num != 0) { 1773 /* should contain no data */ 1774 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1775 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1776 return -1; 1777 } 1778 1779 return 1; 1780 } 1781 1782 static int 1783 ssl3_send_client_kex_rsa(SSL *s, CBB *cbb) 1784 { 1785 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1786 unsigned char *enc_pms = NULL; 1787 uint16_t max_legacy_version; 1788 EVP_PKEY *pkey; 1789 RSA *rsa; 1790 int ret = 0; 1791 int enc_len; 1792 CBB epms; 1793 1794 /* 1795 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1796 */ 1797 1798 pkey = X509_get0_pubkey(s->session->peer_cert); 1799 if (pkey == NULL || (rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) { 1800 SSLerror(s, ERR_R_INTERNAL_ERROR); 1801 goto err; 1802 } 1803 1804 /* 1805 * Our maximum legacy protocol version - while RFC 5246 section 7.4.7.1 1806 * says "The latest (newest) version supported by the client", if we're 1807 * doing RSA key exchange then we have to presume that we're talking to 1808 * a server that does not understand the supported versions extension 1809 * and therefore our maximum version is that sent in the ClientHello. 1810 */ 1811 if (!ssl_max_legacy_version(s, &max_legacy_version)) 1812 goto err; 1813 pms[0] = max_legacy_version >> 8; 1814 pms[1] = max_legacy_version & 0xff; 1815 arc4random_buf(&pms[2], sizeof(pms) - 2); 1816 1817 if ((enc_pms = malloc(RSA_size(rsa))) == NULL) { 1818 SSLerror(s, ERR_R_MALLOC_FAILURE); 1819 goto err; 1820 } 1821 1822 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, rsa, 1823 RSA_PKCS1_PADDING); 1824 if (enc_len <= 0) { 1825 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1826 goto err; 1827 } 1828 1829 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1830 goto err; 1831 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 1832 goto err; 1833 if (!CBB_flush(cbb)) 1834 goto err; 1835 1836 if (!tls12_derive_master_secret(s, pms, sizeof(pms))) 1837 goto err; 1838 1839 ret = 1; 1840 1841 err: 1842 explicit_bzero(pms, sizeof(pms)); 1843 free(enc_pms); 1844 1845 return ret; 1846 } 1847 1848 static int 1849 ssl3_send_client_kex_dhe(SSL *s, CBB *cbb) 1850 { 1851 uint8_t *key = NULL; 1852 size_t key_len = 0; 1853 int ret = 0; 1854 1855 /* Ensure that we have an ephemeral key from the server for DHE. */ 1856 if (s->s3->hs.key_share == NULL) { 1857 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1858 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1859 goto err; 1860 } 1861 1862 if (!tls_key_share_generate(s->s3->hs.key_share)) 1863 goto err; 1864 if (!tls_key_share_public(s->s3->hs.key_share, cbb)) 1865 goto err; 1866 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len)) 1867 goto err; 1868 1869 if (!tls_key_share_peer_security(s, s->s3->hs.key_share)) { 1870 SSLerror(s, SSL_R_DH_KEY_TOO_SMALL); 1871 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1872 return 0; 1873 } 1874 1875 if (!tls12_derive_master_secret(s, key, key_len)) 1876 goto err; 1877 1878 ret = 1; 1879 1880 err: 1881 freezero(key, key_len); 1882 1883 return ret; 1884 } 1885 1886 static int 1887 ssl3_send_client_kex_ecdhe(SSL *s, CBB *cbb) 1888 { 1889 uint8_t *key = NULL; 1890 size_t key_len = 0; 1891 CBB public; 1892 int ret = 0; 1893 1894 /* Ensure that we have an ephemeral key for ECDHE. */ 1895 if (s->s3->hs.key_share == NULL) { 1896 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1897 SSLerror(s, ERR_R_INTERNAL_ERROR); 1898 goto err; 1899 } 1900 1901 if (!tls_key_share_generate(s->s3->hs.key_share)) 1902 goto err; 1903 1904 if (!CBB_add_u8_length_prefixed(cbb, &public)) 1905 return 0; 1906 if (!tls_key_share_public(s->s3->hs.key_share, &public)) 1907 goto err; 1908 if (!CBB_flush(cbb)) 1909 goto err; 1910 1911 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len)) 1912 goto err; 1913 1914 if (!tls12_derive_master_secret(s, key, key_len)) 1915 goto err; 1916 1917 ret = 1; 1918 1919 err: 1920 freezero(key, key_len); 1921 1922 return ret; 1923 } 1924 1925 static int 1926 ssl3_send_client_key_exchange(SSL *s) 1927 { 1928 unsigned long alg_k; 1929 CBB cbb, kex; 1930 1931 memset(&cbb, 0, sizeof(cbb)); 1932 1933 if (s->s3->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 1934 alg_k = s->s3->hs.cipher->algorithm_mkey; 1935 1936 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 1937 SSL3_MT_CLIENT_KEY_EXCHANGE)) 1938 goto err; 1939 1940 if (alg_k & SSL_kRSA) { 1941 if (!ssl3_send_client_kex_rsa(s, &kex)) 1942 goto err; 1943 } else if (alg_k & SSL_kDHE) { 1944 if (!ssl3_send_client_kex_dhe(s, &kex)) 1945 goto err; 1946 } else if (alg_k & SSL_kECDHE) { 1947 if (!ssl3_send_client_kex_ecdhe(s, &kex)) 1948 goto err; 1949 } else { 1950 ssl3_send_alert(s, SSL3_AL_FATAL, 1951 SSL_AD_HANDSHAKE_FAILURE); 1952 SSLerror(s, ERR_R_INTERNAL_ERROR); 1953 goto err; 1954 } 1955 1956 if (!ssl3_handshake_msg_finish(s, &cbb)) 1957 goto err; 1958 1959 s->s3->hs.state = SSL3_ST_CW_KEY_EXCH_B; 1960 } 1961 1962 /* SSL3_ST_CW_KEY_EXCH_B */ 1963 return (ssl3_handshake_write(s)); 1964 1965 err: 1966 CBB_cleanup(&cbb); 1967 1968 return (-1); 1969 } 1970 1971 static int 1972 ssl3_send_client_verify_sigalgs(SSL *s, EVP_PKEY *pkey, 1973 const struct ssl_sigalg *sigalg, CBB *cert_verify) 1974 { 1975 CBB cbb_signature; 1976 EVP_PKEY_CTX *pctx = NULL; 1977 EVP_MD_CTX *mctx = NULL; 1978 const unsigned char *hdata; 1979 unsigned char *signature = NULL; 1980 size_t signature_len, hdata_len; 1981 int ret = 0; 1982 1983 if ((mctx = EVP_MD_CTX_new()) == NULL) 1984 goto err; 1985 1986 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 1987 SSLerror(s, ERR_R_INTERNAL_ERROR); 1988 goto err; 1989 } 1990 if (!EVP_DigestSignInit(mctx, &pctx, sigalg->md(), NULL, pkey)) { 1991 SSLerror(s, ERR_R_EVP_LIB); 1992 goto err; 1993 } 1994 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1995 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 1996 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 1997 SSLerror(s, ERR_R_EVP_LIB); 1998 goto err; 1999 } 2000 if (!EVP_DigestSign(mctx, NULL, &signature_len, hdata, hdata_len)) { 2001 SSLerror(s, ERR_R_EVP_LIB); 2002 goto err; 2003 } 2004 if ((signature = calloc(1, signature_len)) == NULL) { 2005 SSLerror(s, ERR_R_MALLOC_FAILURE); 2006 goto err; 2007 } 2008 if (!EVP_DigestSign(mctx, signature, &signature_len, hdata, hdata_len)) { 2009 SSLerror(s, ERR_R_EVP_LIB); 2010 goto err; 2011 } 2012 2013 if (!CBB_add_u16(cert_verify, sigalg->value)) 2014 goto err; 2015 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2016 goto err; 2017 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2018 goto err; 2019 if (!CBB_flush(cert_verify)) 2020 goto err; 2021 2022 ret = 1; 2023 2024 err: 2025 EVP_MD_CTX_free(mctx); 2026 free(signature); 2027 return ret; 2028 } 2029 2030 static int 2031 ssl3_send_client_verify_rsa(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2032 { 2033 CBB cbb_signature; 2034 RSA *rsa; 2035 unsigned char data[EVP_MAX_MD_SIZE]; 2036 unsigned char *signature = NULL; 2037 unsigned int signature_len; 2038 size_t data_len; 2039 int ret = 0; 2040 2041 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2042 goto err; 2043 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2044 goto err; 2045 if ((rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) 2046 goto err; 2047 if (RSA_sign(NID_md5_sha1, data, data_len, signature, &signature_len, 2048 rsa) <= 0 ) { 2049 SSLerror(s, ERR_R_RSA_LIB); 2050 goto err; 2051 } 2052 2053 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2054 goto err; 2055 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2056 goto err; 2057 if (!CBB_flush(cert_verify)) 2058 goto err; 2059 2060 ret = 1; 2061 err: 2062 free(signature); 2063 return ret; 2064 } 2065 2066 static int 2067 ssl3_send_client_verify_ec(SSL *s, EVP_PKEY *pkey, CBB *cert_verify) 2068 { 2069 CBB cbb_signature; 2070 EC_KEY *eckey; 2071 unsigned char data[EVP_MAX_MD_SIZE]; 2072 unsigned char *signature = NULL; 2073 unsigned int signature_len; 2074 int ret = 0; 2075 2076 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2077 goto err; 2078 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2079 goto err; 2080 if ((eckey = EVP_PKEY_get0_EC_KEY(pkey)) == NULL) 2081 goto err; 2082 if (!ECDSA_sign(0, &data[MD5_DIGEST_LENGTH], SHA_DIGEST_LENGTH, 2083 signature, &signature_len, eckey)) { 2084 SSLerror(s, ERR_R_ECDSA_LIB); 2085 goto err; 2086 } 2087 2088 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2089 goto err; 2090 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2091 goto err; 2092 if (!CBB_flush(cert_verify)) 2093 goto err; 2094 2095 ret = 1; 2096 err: 2097 free(signature); 2098 return ret; 2099 } 2100 2101 static int 2102 ssl3_send_client_verify(SSL *s) 2103 { 2104 const struct ssl_sigalg *sigalg; 2105 CBB cbb, cert_verify; 2106 EVP_PKEY *pkey; 2107 2108 memset(&cbb, 0, sizeof(cbb)); 2109 2110 if (s->s3->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2111 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2112 SSL3_MT_CERTIFICATE_VERIFY)) 2113 goto err; 2114 2115 pkey = s->cert->key->privatekey; 2116 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2117 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2118 goto err; 2119 } 2120 s->s3->hs.our_sigalg = sigalg; 2121 2122 /* 2123 * For TLS v1.2 send signature algorithm and signature using 2124 * agreed digest and cached handshake records. 2125 */ 2126 if (SSL_USE_SIGALGS(s)) { 2127 if (!ssl3_send_client_verify_sigalgs(s, pkey, sigalg, 2128 &cert_verify)) 2129 goto err; 2130 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_RSA) { 2131 if (!ssl3_send_client_verify_rsa(s, pkey, &cert_verify)) 2132 goto err; 2133 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) { 2134 if (!ssl3_send_client_verify_ec(s, pkey, &cert_verify)) 2135 goto err; 2136 } else { 2137 SSLerror(s, ERR_R_INTERNAL_ERROR); 2138 goto err; 2139 } 2140 2141 tls1_transcript_free(s); 2142 2143 if (!ssl3_handshake_msg_finish(s, &cbb)) 2144 goto err; 2145 2146 s->s3->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2147 } 2148 2149 return (ssl3_handshake_write(s)); 2150 2151 err: 2152 CBB_cleanup(&cbb); 2153 2154 return (-1); 2155 } 2156 2157 static int 2158 ssl3_send_client_certificate(SSL *s) 2159 { 2160 EVP_PKEY *pkey = NULL; 2161 X509 *x509 = NULL; 2162 CBB cbb, client_cert; 2163 int i; 2164 2165 memset(&cbb, 0, sizeof(cbb)); 2166 2167 if (s->s3->hs.state == SSL3_ST_CW_CERT_A) { 2168 if (s->cert->key->x509 == NULL || 2169 s->cert->key->privatekey == NULL) 2170 s->s3->hs.state = SSL3_ST_CW_CERT_B; 2171 else 2172 s->s3->hs.state = SSL3_ST_CW_CERT_C; 2173 } 2174 2175 /* We need to get a client cert */ 2176 if (s->s3->hs.state == SSL3_ST_CW_CERT_B) { 2177 /* 2178 * If we get an error, we need to 2179 * ssl->rwstate = SSL_X509_LOOKUP; return(-1); 2180 * We then get retried later. 2181 */ 2182 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2183 if (i < 0) { 2184 s->rwstate = SSL_X509_LOOKUP; 2185 return (-1); 2186 } 2187 s->rwstate = SSL_NOTHING; 2188 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2189 s->s3->hs.state = SSL3_ST_CW_CERT_B; 2190 if (!SSL_use_certificate(s, x509) || 2191 !SSL_use_PrivateKey(s, pkey)) 2192 i = 0; 2193 } else if (i == 1) { 2194 i = 0; 2195 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2196 } 2197 2198 X509_free(x509); 2199 EVP_PKEY_free(pkey); 2200 if (i == 0) { 2201 s->s3->hs.tls12.cert_request = 2; 2202 2203 /* There is no client certificate to verify. */ 2204 tls1_transcript_free(s); 2205 } 2206 2207 /* Ok, we have a cert */ 2208 s->s3->hs.state = SSL3_ST_CW_CERT_C; 2209 } 2210 2211 if (s->s3->hs.state == SSL3_ST_CW_CERT_C) { 2212 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2213 SSL3_MT_CERTIFICATE)) 2214 goto err; 2215 if (!ssl3_output_cert_chain(s, &client_cert, 2216 (s->s3->hs.tls12.cert_request == 2) ? NULL : s->cert->key)) 2217 goto err; 2218 if (!ssl3_handshake_msg_finish(s, &cbb)) 2219 goto err; 2220 2221 s->s3->hs.state = SSL3_ST_CW_CERT_D; 2222 } 2223 2224 /* SSL3_ST_CW_CERT_D */ 2225 return (ssl3_handshake_write(s)); 2226 2227 err: 2228 CBB_cleanup(&cbb); 2229 2230 return (0); 2231 } 2232 2233 #define has_bits(i,m) (((i)&(m)) == (m)) 2234 2235 static int 2236 ssl3_check_cert_and_algorithm(SSL *s) 2237 { 2238 long alg_k, alg_a; 2239 int nid = NID_undef; 2240 int i; 2241 2242 alg_k = s->s3->hs.cipher->algorithm_mkey; 2243 alg_a = s->s3->hs.cipher->algorithm_auth; 2244 2245 /* We don't have a certificate. */ 2246 if (alg_a & SSL_aNULL) 2247 return (1); 2248 2249 if (s->s3->hs.key_share != NULL) 2250 nid = tls_key_share_nid(s->s3->hs.key_share); 2251 2252 /* This is the passed certificate. */ 2253 2254 if (s->session->peer_cert_type == SSL_PKEY_ECC) { 2255 if (!ssl_check_srvr_ecc_cert_and_alg(s, s->session->peer_cert)) { 2256 SSLerror(s, SSL_R_BAD_ECC_CERT); 2257 goto fatal_err; 2258 } 2259 return (1); 2260 } 2261 2262 i = X509_certificate_type(s->session->peer_cert, NULL); 2263 2264 /* Check that we have a certificate if we require one. */ 2265 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2266 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2267 goto fatal_err; 2268 } 2269 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2270 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2271 goto fatal_err; 2272 } 2273 if ((alg_k & SSL_kDHE) && 2274 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (nid == NID_dhKeyAgreement))) { 2275 SSLerror(s, SSL_R_MISSING_DH_KEY); 2276 goto fatal_err; 2277 } 2278 2279 return (1); 2280 2281 fatal_err: 2282 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2283 2284 return (0); 2285 } 2286 2287 /* 2288 * Check to see if handshake is full or resumed. Usually this is just a 2289 * case of checking to see if a cache hit has occurred. In the case of 2290 * session tickets we have to check the next message to be sure. 2291 */ 2292 2293 static int 2294 ssl3_check_finished(SSL *s) 2295 { 2296 int ret; 2297 2298 /* If we have no ticket it cannot be a resumed session. */ 2299 if (!s->session->tlsext_tick) 2300 return (1); 2301 /* this function is called when we really expect a Certificate 2302 * message, so permit appropriate message length */ 2303 if ((ret = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2304 SSL3_ST_CR_CERT_B, -1, s->max_cert_list)) <= 0) 2305 return ret; 2306 2307 s->s3->hs.tls12.reuse_message = 1; 2308 if ((s->s3->hs.tls12.message_type == SSL3_MT_FINISHED) || 2309 (s->s3->hs.tls12.message_type == SSL3_MT_NEWSESSION_TICKET)) 2310 return (2); 2311 2312 return (1); 2313 } 2314 2315 static int 2316 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2317 { 2318 if (s->ctx->client_cert_cb == NULL) 2319 return 0; 2320 2321 return s->ctx->client_cert_cb(s, px509, ppkey); 2322 } 2323 2324 static int 2325 ssl3_send_client_change_cipher_spec(SSL *s) 2326 { 2327 size_t outlen; 2328 CBB cbb; 2329 2330 memset(&cbb, 0, sizeof(cbb)); 2331 2332 if (s->s3->hs.state == SSL3_ST_CW_CHANGE_A) { 2333 if (!CBB_init_fixed(&cbb, s->init_buf->data, 2334 s->init_buf->length)) 2335 goto err; 2336 if (!CBB_add_u8(&cbb, SSL3_MT_CCS)) 2337 goto err; 2338 if (!CBB_finish(&cbb, NULL, &outlen)) 2339 goto err; 2340 2341 if (outlen > INT_MAX) 2342 goto err; 2343 2344 s->init_num = (int)outlen; 2345 s->init_off = 0; 2346 2347 if (SSL_is_dtls(s)) { 2348 s->d1->handshake_write_seq = 2349 s->d1->next_handshake_write_seq; 2350 dtls1_set_message_header_int(s, SSL3_MT_CCS, 0, 2351 s->d1->handshake_write_seq, 0, 0); 2352 dtls1_buffer_message(s, 1); 2353 } 2354 2355 s->s3->hs.state = SSL3_ST_CW_CHANGE_B; 2356 } 2357 2358 /* SSL3_ST_CW_CHANGE_B */ 2359 return ssl3_record_write(s, SSL3_RT_CHANGE_CIPHER_SPEC); 2360 2361 err: 2362 CBB_cleanup(&cbb); 2363 2364 return -1; 2365 } 2366 2367 static int 2368 ssl3_send_client_finished(SSL *s) 2369 { 2370 CBB cbb, finished; 2371 2372 memset(&cbb, 0, sizeof(cbb)); 2373 2374 if (s->s3->hs.state == SSL3_ST_CW_FINISHED_A) { 2375 if (!tls12_derive_finished(s)) 2376 goto err; 2377 2378 /* Copy finished so we can use it for renegotiation checks. */ 2379 memcpy(s->s3->previous_client_finished, 2380 s->s3->hs.finished, s->s3->hs.finished_len); 2381 s->s3->previous_client_finished_len = 2382 s->s3->hs.finished_len; 2383 2384 if (!ssl3_handshake_msg_start(s, &cbb, &finished, 2385 SSL3_MT_FINISHED)) 2386 goto err; 2387 if (!CBB_add_bytes(&finished, s->s3->hs.finished, 2388 s->s3->hs.finished_len)) 2389 goto err; 2390 if (!ssl3_handshake_msg_finish(s, &cbb)) 2391 goto err; 2392 2393 s->s3->hs.state = SSL3_ST_CW_FINISHED_B; 2394 } 2395 2396 return (ssl3_handshake_write(s)); 2397 2398 err: 2399 CBB_cleanup(&cbb); 2400 2401 return (-1); 2402 } 2403 2404 static int 2405 ssl3_get_server_finished(SSL *s) 2406 { 2407 int al, md_len, ret; 2408 CBS cbs; 2409 2410 /* should actually be 36+4 :-) */ 2411 if ((ret = ssl3_get_message(s, SSL3_ST_CR_FINISHED_A, 2412 SSL3_ST_CR_FINISHED_B, SSL3_MT_FINISHED, 64)) <= 0) 2413 return ret; 2414 2415 /* If this occurs, we have missed a message */ 2416 if (!s->s3->change_cipher_spec) { 2417 al = SSL_AD_UNEXPECTED_MESSAGE; 2418 SSLerror(s, SSL_R_GOT_A_FIN_BEFORE_A_CCS); 2419 goto fatal_err; 2420 } 2421 s->s3->change_cipher_spec = 0; 2422 2423 md_len = TLS1_FINISH_MAC_LENGTH; 2424 2425 if (s->init_num < 0) { 2426 al = SSL_AD_DECODE_ERROR; 2427 SSLerror(s, SSL_R_BAD_DIGEST_LENGTH); 2428 goto fatal_err; 2429 } 2430 2431 CBS_init(&cbs, s->init_msg, s->init_num); 2432 2433 if (s->s3->hs.peer_finished_len != md_len || 2434 CBS_len(&cbs) != md_len) { 2435 al = SSL_AD_DECODE_ERROR; 2436 SSLerror(s, SSL_R_BAD_DIGEST_LENGTH); 2437 goto fatal_err; 2438 } 2439 2440 if (!CBS_mem_equal(&cbs, s->s3->hs.peer_finished, CBS_len(&cbs))) { 2441 al = SSL_AD_DECRYPT_ERROR; 2442 SSLerror(s, SSL_R_DIGEST_CHECK_FAILED); 2443 goto fatal_err; 2444 } 2445 2446 /* Copy finished so we can use it for renegotiation checks. */ 2447 OPENSSL_assert(md_len <= EVP_MAX_MD_SIZE); 2448 memcpy(s->s3->previous_server_finished, 2449 s->s3->hs.peer_finished, md_len); 2450 s->s3->previous_server_finished_len = md_len; 2451 2452 return (1); 2453 fatal_err: 2454 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2455 return (0); 2456 } 2457