1 /* $OpenBSD: ssl_clnt.c,v 1.63 2020/01/30 16:25:09 jsing Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 /* ==================================================================== 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 /* ==================================================================== 112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 113 * 114 * Portions of the attached software ("Contribution") are developed by 115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 116 * 117 * The Contribution is licensed pursuant to the OpenSSL open source 118 * license provided above. 119 * 120 * ECC cipher suite support in OpenSSL originally written by 121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. 122 * 123 */ 124 /* ==================================================================== 125 * Copyright 2005 Nokia. All rights reserved. 126 * 127 * The portions of the attached software ("Contribution") is developed by 128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 129 * license. 130 * 131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 133 * support (see RFC 4279) to OpenSSL. 134 * 135 * No patent licenses or other rights except those expressly stated in 136 * the OpenSSL open source license shall be deemed granted or received 137 * expressly, by implication, estoppel, or otherwise. 138 * 139 * No assurances are provided by Nokia that the Contribution does not 140 * infringe the patent or other intellectual property rights of any third 141 * party or that the license provides you with all the necessary rights 142 * to make use of the Contribution. 143 * 144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 148 * OTHERWISE. 149 */ 150 151 #include <limits.h> 152 #include <stdint.h> 153 #include <stdio.h> 154 155 #include "ssl_locl.h" 156 157 #include <openssl/bn.h> 158 #include <openssl/buffer.h> 159 #include <openssl/curve25519.h> 160 #include <openssl/dh.h> 161 #include <openssl/evp.h> 162 #include <openssl/md5.h> 163 #include <openssl/objects.h> 164 165 #ifndef OPENSSL_NO_ENGINE 166 #include <openssl/engine.h> 167 #endif 168 #ifndef OPENSSL_NO_GOST 169 #include <openssl/gost.h> 170 #endif 171 172 #include "bytestring.h" 173 #include "ssl_sigalgs.h" 174 #include "ssl_tlsext.h" 175 176 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b); 177 178 int 179 ssl3_connect(SSL *s) 180 { 181 void (*cb)(const SSL *ssl, int type, int val) = NULL; 182 int ret = -1; 183 int new_state, state, skip = 0; 184 185 ERR_clear_error(); 186 errno = 0; 187 188 if (s->internal->info_callback != NULL) 189 cb = s->internal->info_callback; 190 else if (s->ctx->internal->info_callback != NULL) 191 cb = s->ctx->internal->info_callback; 192 193 s->internal->in_handshake++; 194 if (!SSL_in_init(s) || SSL_in_before(s)) 195 SSL_clear(s); 196 197 for (;;) { 198 state = S3I(s)->hs.state; 199 200 switch (S3I(s)->hs.state) { 201 case SSL_ST_RENEGOTIATE: 202 s->internal->renegotiate = 1; 203 S3I(s)->hs.state = SSL_ST_CONNECT; 204 s->ctx->internal->stats.sess_connect_renegotiate++; 205 /* break */ 206 case SSL_ST_BEFORE: 207 case SSL_ST_CONNECT: 208 case SSL_ST_BEFORE|SSL_ST_CONNECT: 209 case SSL_ST_OK|SSL_ST_CONNECT: 210 211 s->server = 0; 212 if (cb != NULL) 213 cb(s, SSL_CB_HANDSHAKE_START, 1); 214 215 if (SSL_IS_DTLS(s)) { 216 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) { 217 SSLerror(s, ERR_R_INTERNAL_ERROR); 218 ret = -1; 219 goto end; 220 } 221 } else { 222 if ((s->version & 0xff00) != 0x0300) { 223 SSLerror(s, ERR_R_INTERNAL_ERROR); 224 ret = -1; 225 goto end; 226 } 227 } 228 229 /* s->version=SSL3_VERSION; */ 230 s->internal->type = SSL_ST_CONNECT; 231 232 if (!ssl3_setup_init_buffer(s)) { 233 ret = -1; 234 goto end; 235 } 236 if (!ssl3_setup_buffers(s)) { 237 ret = -1; 238 goto end; 239 } 240 if (!ssl_init_wbio_buffer(s, 0)) { 241 ret = -1; 242 goto end; 243 } 244 245 /* don't push the buffering BIO quite yet */ 246 247 if (!tls1_transcript_init(s)) { 248 ret = -1; 249 goto end; 250 } 251 252 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 253 s->ctx->internal->stats.sess_connect++; 254 s->internal->init_num = 0; 255 256 if (SSL_IS_DTLS(s)) { 257 /* mark client_random uninitialized */ 258 memset(s->s3->client_random, 0, 259 sizeof(s->s3->client_random)); 260 D1I(s)->send_cookie = 0; 261 s->internal->hit = 0; 262 } 263 break; 264 265 case SSL3_ST_CW_CLNT_HELLO_A: 266 case SSL3_ST_CW_CLNT_HELLO_B: 267 s->internal->shutdown = 0; 268 269 if (SSL_IS_DTLS(s)) { 270 /* every DTLS ClientHello resets Finished MAC */ 271 tls1_transcript_reset(s); 272 273 dtls1_start_timer(s); 274 } 275 276 ret = ssl3_send_client_hello(s); 277 if (ret <= 0) 278 goto end; 279 280 if (SSL_IS_DTLS(s) && D1I(s)->send_cookie) { 281 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 282 S3I(s)->hs.next_state = SSL3_ST_CR_SRVR_HELLO_A; 283 } else 284 S3I(s)->hs.state = SSL3_ST_CR_SRVR_HELLO_A; 285 286 s->internal->init_num = 0; 287 288 /* turn on buffering for the next lot of output */ 289 if (s->bbio != s->wbio) 290 s->wbio = BIO_push(s->bbio, s->wbio); 291 292 break; 293 294 case SSL3_ST_CR_SRVR_HELLO_A: 295 case SSL3_ST_CR_SRVR_HELLO_B: 296 ret = ssl3_get_server_hello(s); 297 if (ret <= 0) 298 goto end; 299 300 if (s->internal->hit) { 301 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 302 if (!SSL_IS_DTLS(s)) { 303 if (s->internal->tlsext_ticket_expected) { 304 /* receive renewed session ticket */ 305 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 306 } 307 308 /* No client certificate verification. */ 309 tls1_transcript_free(s); 310 } 311 } else if (SSL_IS_DTLS(s)) { 312 S3I(s)->hs.state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 313 } else { 314 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 315 } 316 s->internal->init_num = 0; 317 break; 318 319 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 320 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 321 ret = dtls1_get_hello_verify(s); 322 if (ret <= 0) 323 goto end; 324 dtls1_stop_timer(s); 325 if (D1I(s)->send_cookie) /* start again, with a cookie */ 326 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 327 else 328 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 329 s->internal->init_num = 0; 330 break; 331 332 case SSL3_ST_CR_CERT_A: 333 case SSL3_ST_CR_CERT_B: 334 ret = ssl3_check_finished(s); 335 if (ret <= 0) 336 goto end; 337 if (ret == 2) { 338 s->internal->hit = 1; 339 if (s->internal->tlsext_ticket_expected) 340 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 341 else 342 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 343 s->internal->init_num = 0; 344 break; 345 } 346 /* Check if it is anon DH/ECDH. */ 347 if (!(S3I(s)->hs.new_cipher->algorithm_auth & 348 SSL_aNULL)) { 349 ret = ssl3_get_server_certificate(s); 350 if (ret <= 0) 351 goto end; 352 if (s->internal->tlsext_status_expected) 353 S3I(s)->hs.state = SSL3_ST_CR_CERT_STATUS_A; 354 else 355 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 356 } else { 357 skip = 1; 358 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 359 } 360 s->internal->init_num = 0; 361 break; 362 363 case SSL3_ST_CR_KEY_EXCH_A: 364 case SSL3_ST_CR_KEY_EXCH_B: 365 ret = ssl3_get_server_key_exchange(s); 366 if (ret <= 0) 367 goto end; 368 S3I(s)->hs.state = SSL3_ST_CR_CERT_REQ_A; 369 s->internal->init_num = 0; 370 371 /* 372 * At this point we check that we have the 373 * required stuff from the server. 374 */ 375 if (!ssl3_check_cert_and_algorithm(s)) { 376 ret = -1; 377 goto end; 378 } 379 break; 380 381 case SSL3_ST_CR_CERT_REQ_A: 382 case SSL3_ST_CR_CERT_REQ_B: 383 ret = ssl3_get_certificate_request(s); 384 if (ret <= 0) 385 goto end; 386 S3I(s)->hs.state = SSL3_ST_CR_SRVR_DONE_A; 387 s->internal->init_num = 0; 388 break; 389 390 case SSL3_ST_CR_SRVR_DONE_A: 391 case SSL3_ST_CR_SRVR_DONE_B: 392 ret = ssl3_get_server_done(s); 393 if (ret <= 0) 394 goto end; 395 if (SSL_IS_DTLS(s)) 396 dtls1_stop_timer(s); 397 if (S3I(s)->tmp.cert_req) 398 S3I(s)->hs.state = SSL3_ST_CW_CERT_A; 399 else 400 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 401 s->internal->init_num = 0; 402 403 break; 404 405 case SSL3_ST_CW_CERT_A: 406 case SSL3_ST_CW_CERT_B: 407 case SSL3_ST_CW_CERT_C: 408 case SSL3_ST_CW_CERT_D: 409 if (SSL_IS_DTLS(s)) 410 dtls1_start_timer(s); 411 ret = ssl3_send_client_certificate(s); 412 if (ret <= 0) 413 goto end; 414 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 415 s->internal->init_num = 0; 416 break; 417 418 case SSL3_ST_CW_KEY_EXCH_A: 419 case SSL3_ST_CW_KEY_EXCH_B: 420 if (SSL_IS_DTLS(s)) 421 dtls1_start_timer(s); 422 ret = ssl3_send_client_key_exchange(s); 423 if (ret <= 0) 424 goto end; 425 /* 426 * EAY EAY EAY need to check for DH fix cert 427 * sent back 428 */ 429 /* 430 * For TLS, cert_req is set to 2, so a cert chain 431 * of nothing is sent, but no verify packet is sent 432 */ 433 /* 434 * XXX: For now, we do not support client 435 * authentication in ECDH cipher suites with 436 * ECDH (rather than ECDSA) certificates. 437 * We need to skip the certificate verify 438 * message when client's ECDH public key is sent 439 * inside the client certificate. 440 */ 441 if (S3I(s)->tmp.cert_req == 1) { 442 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_A; 443 } else { 444 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 445 S3I(s)->change_cipher_spec = 0; 446 } 447 if (!SSL_IS_DTLS(s)) { 448 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 449 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 450 S3I(s)->change_cipher_spec = 0; 451 } 452 } 453 454 s->internal->init_num = 0; 455 break; 456 457 case SSL3_ST_CW_CERT_VRFY_A: 458 case SSL3_ST_CW_CERT_VRFY_B: 459 if (SSL_IS_DTLS(s)) 460 dtls1_start_timer(s); 461 ret = ssl3_send_client_verify(s); 462 if (ret <= 0) 463 goto end; 464 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 465 s->internal->init_num = 0; 466 S3I(s)->change_cipher_spec = 0; 467 break; 468 469 case SSL3_ST_CW_CHANGE_A: 470 case SSL3_ST_CW_CHANGE_B: 471 if (SSL_IS_DTLS(s) && !s->internal->hit) 472 dtls1_start_timer(s); 473 ret = ssl3_send_change_cipher_spec(s, 474 SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B); 475 if (ret <= 0) 476 goto end; 477 478 S3I(s)->hs.state = SSL3_ST_CW_FINISHED_A; 479 s->internal->init_num = 0; 480 481 s->session->cipher = S3I(s)->hs.new_cipher; 482 if (!tls1_setup_key_block(s)) { 483 ret = -1; 484 goto end; 485 } 486 487 if (!tls1_change_cipher_state(s, 488 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) { 489 ret = -1; 490 goto end; 491 } 492 493 if (SSL_IS_DTLS(s)) 494 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 495 496 break; 497 498 case SSL3_ST_CW_FINISHED_A: 499 case SSL3_ST_CW_FINISHED_B: 500 if (SSL_IS_DTLS(s) && !s->internal->hit) 501 dtls1_start_timer(s); 502 ret = ssl3_send_finished(s, SSL3_ST_CW_FINISHED_A, 503 SSL3_ST_CW_FINISHED_B, TLS_MD_CLIENT_FINISH_CONST, 504 TLS_MD_CLIENT_FINISH_CONST_SIZE); 505 if (ret <= 0) 506 goto end; 507 if (!SSL_IS_DTLS(s)) 508 s->s3->flags |= SSL3_FLAGS_CCS_OK; 509 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 510 511 /* clear flags */ 512 if (s->internal->hit) { 513 S3I(s)->hs.next_state = SSL_ST_OK; 514 } else { 515 /* Allow NewSessionTicket if ticket expected */ 516 if (s->internal->tlsext_ticket_expected) 517 S3I(s)->hs.next_state = 518 SSL3_ST_CR_SESSION_TICKET_A; 519 else 520 S3I(s)->hs.next_state = 521 SSL3_ST_CR_FINISHED_A; 522 } 523 s->internal->init_num = 0; 524 break; 525 526 case SSL3_ST_CR_SESSION_TICKET_A: 527 case SSL3_ST_CR_SESSION_TICKET_B: 528 ret = ssl3_get_new_session_ticket(s); 529 if (ret <= 0) 530 goto end; 531 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 532 s->internal->init_num = 0; 533 break; 534 535 case SSL3_ST_CR_CERT_STATUS_A: 536 case SSL3_ST_CR_CERT_STATUS_B: 537 ret = ssl3_get_cert_status(s); 538 if (ret <= 0) 539 goto end; 540 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 541 s->internal->init_num = 0; 542 break; 543 544 case SSL3_ST_CR_FINISHED_A: 545 case SSL3_ST_CR_FINISHED_B: 546 if (SSL_IS_DTLS(s)) 547 D1I(s)->change_cipher_spec_ok = 1; 548 else 549 s->s3->flags |= SSL3_FLAGS_CCS_OK; 550 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 551 SSL3_ST_CR_FINISHED_B); 552 if (ret <= 0) 553 goto end; 554 if (SSL_IS_DTLS(s)) 555 dtls1_stop_timer(s); 556 557 if (s->internal->hit) 558 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 559 else 560 S3I(s)->hs.state = SSL_ST_OK; 561 s->internal->init_num = 0; 562 break; 563 564 case SSL3_ST_CW_FLUSH: 565 s->internal->rwstate = SSL_WRITING; 566 if (BIO_flush(s->wbio) <= 0) { 567 if (SSL_IS_DTLS(s)) { 568 /* If the write error was fatal, stop trying */ 569 if (!BIO_should_retry(s->wbio)) { 570 s->internal->rwstate = SSL_NOTHING; 571 S3I(s)->hs.state = S3I(s)->hs.next_state; 572 } 573 } 574 ret = -1; 575 goto end; 576 } 577 s->internal->rwstate = SSL_NOTHING; 578 S3I(s)->hs.state = S3I(s)->hs.next_state; 579 break; 580 581 case SSL_ST_OK: 582 /* clean a few things up */ 583 tls1_cleanup_key_block(s); 584 585 if (S3I(s)->handshake_transcript != NULL) { 586 SSLerror(s, ERR_R_INTERNAL_ERROR); 587 ret = -1; 588 goto end; 589 } 590 591 if (!SSL_IS_DTLS(s)) { 592 BUF_MEM_free(s->internal->init_buf); 593 s->internal->init_buf = NULL; 594 } 595 596 ssl_free_wbio_buffer(s); 597 598 s->internal->init_num = 0; 599 s->internal->renegotiate = 0; 600 s->internal->new_session = 0; 601 602 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 603 if (s->internal->hit) 604 s->ctx->internal->stats.sess_hit++; 605 606 ret = 1; 607 /* s->server=0; */ 608 s->internal->handshake_func = ssl3_connect; 609 s->ctx->internal->stats.sess_connect_good++; 610 611 if (cb != NULL) 612 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 613 614 if (SSL_IS_DTLS(s)) { 615 /* done with handshaking */ 616 D1I(s)->handshake_read_seq = 0; 617 D1I(s)->next_handshake_write_seq = 0; 618 } 619 620 goto end; 621 /* break; */ 622 623 default: 624 SSLerror(s, SSL_R_UNKNOWN_STATE); 625 ret = -1; 626 goto end; 627 /* break; */ 628 } 629 630 /* did we do anything */ 631 if (!S3I(s)->tmp.reuse_message && !skip) { 632 if (s->internal->debug) { 633 if ((ret = BIO_flush(s->wbio)) <= 0) 634 goto end; 635 } 636 637 if ((cb != NULL) && (S3I(s)->hs.state != state)) { 638 new_state = S3I(s)->hs.state; 639 S3I(s)->hs.state = state; 640 cb(s, SSL_CB_CONNECT_LOOP, 1); 641 S3I(s)->hs.state = new_state; 642 } 643 } 644 skip = 0; 645 } 646 647 end: 648 s->internal->in_handshake--; 649 if (cb != NULL) 650 cb(s, SSL_CB_CONNECT_EXIT, ret); 651 652 return (ret); 653 } 654 655 int 656 ssl3_send_client_hello(SSL *s) 657 { 658 CBB cbb, client_hello, session_id, cookie, cipher_suites; 659 CBB compression_methods; 660 uint16_t max_version; 661 size_t sl; 662 663 memset(&cbb, 0, sizeof(cbb)); 664 665 if (S3I(s)->hs.state == SSL3_ST_CW_CLNT_HELLO_A) { 666 SSL_SESSION *sess = s->session; 667 668 if (ssl_supported_version_range(s, NULL, &max_version) != 1) { 669 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 670 return (-1); 671 } 672 s->client_version = s->version = max_version; 673 674 if (sess == NULL || 675 sess->ssl_version != s->version || 676 (!sess->session_id_length && !sess->tlsext_tick) || 677 sess->internal->not_resumable) { 678 if (!ssl_get_new_session(s, 0)) 679 goto err; 680 } 681 /* else use the pre-loaded session */ 682 683 /* 684 * If a DTLS ClientHello message is being resent after a 685 * HelloVerifyRequest, we must retain the original client 686 * random value. 687 */ 688 if (!SSL_IS_DTLS(s) || D1I(s)->send_cookie == 0) 689 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE); 690 691 if (!ssl3_handshake_msg_start(s, &cbb, &client_hello, 692 SSL3_MT_CLIENT_HELLO)) 693 goto err; 694 695 /* 696 * Version indicates the negotiated version: for example from 697 * an SSLv2/v3 compatible client hello). The client_version 698 * field is the maximum version we permit and it is also 699 * used in RSA encrypted premaster secrets. Some servers can 700 * choke if we initially report a higher version then 701 * renegotiate to a lower one in the premaster secret. This 702 * didn't happen with TLS 1.0 as most servers supported it 703 * but it can with TLS 1.1 or later if the server only supports 704 * 1.0. 705 * 706 * Possible scenario with previous logic: 707 * 1. Client hello indicates TLS 1.2 708 * 2. Server hello says TLS 1.0 709 * 3. RSA encrypted premaster secret uses 1.2. 710 * 4. Handhaked proceeds using TLS 1.0. 711 * 5. Server sends hello request to renegotiate. 712 * 6. Client hello indicates TLS v1.0 as we now 713 * know that is maximum server supports. 714 * 7. Server chokes on RSA encrypted premaster secret 715 * containing version 1.0. 716 * 717 * For interoperability it should be OK to always use the 718 * maximum version we support in client hello and then rely 719 * on the checking of version to ensure the servers isn't 720 * being inconsistent: for example initially negotiating with 721 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using 722 * client_version in client hello and not resetting it to 723 * the negotiated version. 724 */ 725 if (!CBB_add_u16(&client_hello, s->client_version)) 726 goto err; 727 728 /* Random stuff */ 729 if (!CBB_add_bytes(&client_hello, s->s3->client_random, 730 sizeof(s->s3->client_random))) 731 goto err; 732 733 /* Session ID */ 734 if (!CBB_add_u8_length_prefixed(&client_hello, &session_id)) 735 goto err; 736 if (!s->internal->new_session && 737 s->session->session_id_length > 0) { 738 sl = s->session->session_id_length; 739 if (sl > sizeof(s->session->session_id)) { 740 SSLerror(s, ERR_R_INTERNAL_ERROR); 741 goto err; 742 } 743 if (!CBB_add_bytes(&session_id, 744 s->session->session_id, sl)) 745 goto err; 746 } 747 748 /* DTLS Cookie. */ 749 if (SSL_IS_DTLS(s)) { 750 if (D1I(s)->cookie_len > sizeof(D1I(s)->cookie)) { 751 SSLerror(s, ERR_R_INTERNAL_ERROR); 752 goto err; 753 } 754 if (!CBB_add_u8_length_prefixed(&client_hello, &cookie)) 755 goto err; 756 if (!CBB_add_bytes(&cookie, D1I(s)->cookie, 757 D1I(s)->cookie_len)) 758 goto err; 759 } 760 761 /* Ciphers supported */ 762 if (!CBB_add_u16_length_prefixed(&client_hello, &cipher_suites)) 763 return 0; 764 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), 765 &cipher_suites)) { 766 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE); 767 goto err; 768 } 769 770 /* Add in compression methods (null) */ 771 if (!CBB_add_u8_length_prefixed(&client_hello, 772 &compression_methods)) 773 goto err; 774 if (!CBB_add_u8(&compression_methods, 0)) 775 goto err; 776 777 /* TLS extensions */ 778 if (!tlsext_client_build(s, &client_hello, SSL_TLSEXT_MSG_CH)) { 779 SSLerror(s, ERR_R_INTERNAL_ERROR); 780 goto err; 781 } 782 783 if (!ssl3_handshake_msg_finish(s, &cbb)) 784 goto err; 785 786 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_B; 787 } 788 789 /* SSL3_ST_CW_CLNT_HELLO_B */ 790 return (ssl3_handshake_write(s)); 791 792 err: 793 CBB_cleanup(&cbb); 794 795 return (-1); 796 } 797 798 int 799 ssl3_get_server_hello(SSL *s) 800 { 801 CBS cbs, server_random, session_id; 802 uint16_t server_version, cipher_suite; 803 uint16_t min_version, max_version; 804 uint8_t compression_method; 805 STACK_OF(SSL_CIPHER) *sk; 806 const SSL_CIPHER *cipher; 807 const SSL_METHOD *method; 808 unsigned long alg_k; 809 size_t outlen; 810 int i, al, ok; 811 long n; 812 813 s->internal->first_packet = 1; 814 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 815 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, /* ?? */ &ok); 816 if (!ok) 817 return ((int)n); 818 s->internal->first_packet = 0; 819 820 if (n < 0) 821 goto truncated; 822 823 CBS_init(&cbs, s->internal->init_msg, n); 824 825 if (SSL_IS_DTLS(s)) { 826 if (S3I(s)->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 827 if (D1I(s)->send_cookie == 0) { 828 S3I(s)->tmp.reuse_message = 1; 829 return (1); 830 } else { 831 /* Already sent a cookie. */ 832 al = SSL_AD_UNEXPECTED_MESSAGE; 833 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 834 goto f_err; 835 } 836 } 837 } 838 839 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_HELLO) { 840 al = SSL_AD_UNEXPECTED_MESSAGE; 841 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 842 goto f_err; 843 } 844 845 if (!CBS_get_u16(&cbs, &server_version)) 846 goto truncated; 847 848 if (ssl_supported_version_range(s, &min_version, &max_version) != 1) { 849 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 850 goto err; 851 } 852 853 if (server_version < min_version || server_version > max_version) { 854 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 855 s->version = (s->version & 0xff00) | (server_version & 0xff); 856 al = SSL_AD_PROTOCOL_VERSION; 857 goto f_err; 858 } 859 s->version = server_version; 860 861 if ((method = tls1_get_client_method(server_version)) == NULL) 862 method = dtls1_get_client_method(server_version); 863 if (method == NULL) { 864 SSLerror(s, ERR_R_INTERNAL_ERROR); 865 goto err; 866 } 867 s->method = method; 868 869 /* Server random. */ 870 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 871 goto truncated; 872 if (!CBS_write_bytes(&server_random, s->s3->server_random, 873 sizeof(s->s3->server_random), NULL)) 874 goto err; 875 876 /* Session ID. */ 877 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 878 goto truncated; 879 880 if ((CBS_len(&session_id) > sizeof(s->session->session_id)) || 881 (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE)) { 882 al = SSL_AD_ILLEGAL_PARAMETER; 883 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 884 goto f_err; 885 } 886 887 /* Cipher suite. */ 888 if (!CBS_get_u16(&cbs, &cipher_suite)) 889 goto truncated; 890 891 /* 892 * Check if we want to resume the session based on external 893 * pre-shared secret. 894 */ 895 if (s->internal->tls_session_secret_cb) { 896 SSL_CIPHER *pref_cipher = NULL; 897 s->session->master_key_length = sizeof(s->session->master_key); 898 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 899 &s->session->master_key_length, NULL, &pref_cipher, 900 s->internal->tls_session_secret_cb_arg)) { 901 s->session->cipher = pref_cipher ? pref_cipher : 902 ssl3_get_cipher_by_value(cipher_suite); 903 s->s3->flags |= SSL3_FLAGS_CCS_OK; 904 } 905 } 906 907 if (s->session->session_id_length != 0 && 908 CBS_mem_equal(&session_id, s->session->session_id, 909 s->session->session_id_length)) { 910 if (s->sid_ctx_length != s->session->sid_ctx_length || 911 timingsafe_memcmp(s->session->sid_ctx, 912 s->sid_ctx, s->sid_ctx_length) != 0) { 913 /* actually a client application bug */ 914 al = SSL_AD_ILLEGAL_PARAMETER; 915 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 916 goto f_err; 917 } 918 s->s3->flags |= SSL3_FLAGS_CCS_OK; 919 s->internal->hit = 1; 920 } else { 921 /* a miss or crap from the other end */ 922 923 /* If we were trying for session-id reuse, make a new 924 * SSL_SESSION so we don't stuff up other people */ 925 s->internal->hit = 0; 926 if (s->session->session_id_length > 0) { 927 if (!ssl_get_new_session(s, 0)) { 928 al = SSL_AD_INTERNAL_ERROR; 929 goto f_err; 930 } 931 } 932 933 /* 934 * XXX - improve the handling for the case where there is a 935 * zero length session identifier. 936 */ 937 if (!CBS_write_bytes(&session_id, s->session->session_id, 938 sizeof(s->session->session_id), &outlen)) 939 goto err; 940 s->session->session_id_length = outlen; 941 942 s->session->ssl_version = s->version; 943 } 944 945 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 946 al = SSL_AD_ILLEGAL_PARAMETER; 947 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 948 goto f_err; 949 } 950 951 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 952 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 953 (TLS1_get_version(s) < TLS1_2_VERSION)) { 954 al = SSL_AD_ILLEGAL_PARAMETER; 955 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 956 goto f_err; 957 } 958 959 sk = ssl_get_ciphers_by_id(s); 960 i = sk_SSL_CIPHER_find(sk, cipher); 961 if (i < 0) { 962 /* we did not say we would use this cipher */ 963 al = SSL_AD_ILLEGAL_PARAMETER; 964 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 965 goto f_err; 966 } 967 968 /* 969 * Depending on the session caching (internal/external), the cipher 970 * and/or cipher_id values may not be set. Make sure that 971 * cipher_id is set and use it for comparison. 972 */ 973 if (s->session->cipher) 974 s->session->cipher_id = s->session->cipher->id; 975 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 976 al = SSL_AD_ILLEGAL_PARAMETER; 977 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 978 goto f_err; 979 } 980 S3I(s)->hs.new_cipher = cipher; 981 982 if (!tls1_transcript_hash_init(s)) 983 goto err; 984 985 /* 986 * Don't digest cached records if no sigalgs: we may need them for 987 * client authentication. 988 */ 989 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 990 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST))) 991 tls1_transcript_free(s); 992 993 if (!CBS_get_u8(&cbs, &compression_method)) 994 goto truncated; 995 996 if (compression_method != 0) { 997 al = SSL_AD_ILLEGAL_PARAMETER; 998 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 999 goto f_err; 1000 } 1001 1002 if (!tlsext_client_parse(s, &cbs, &al, SSL_TLSEXT_MSG_SH)) { 1003 SSLerror(s, SSL_R_PARSE_TLSEXT); 1004 goto f_err; 1005 } 1006 1007 /* 1008 * Determine if we need to see RI. Strictly speaking if we want to 1009 * avoid an attack we should *always* see RI even on initial server 1010 * hello because the client doesn't see any renegotiation during an 1011 * attack. However this would mean we could not connect to any server 1012 * which doesn't support RI so for the immediate future tolerate RI 1013 * absence on initial connect only. 1014 */ 1015 if (!S3I(s)->renegotiate_seen && 1016 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1017 al = SSL_AD_HANDSHAKE_FAILURE; 1018 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1019 goto f_err; 1020 } 1021 1022 if (ssl_check_serverhello_tlsext(s) <= 0) { 1023 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1024 goto err; 1025 } 1026 1027 return (1); 1028 1029 truncated: 1030 /* wrong packet length */ 1031 al = SSL_AD_DECODE_ERROR; 1032 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1033 f_err: 1034 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1035 err: 1036 return (-1); 1037 } 1038 1039 int 1040 ssl3_get_server_certificate(SSL *s) 1041 { 1042 int al, i, ok, ret = -1; 1043 long n; 1044 CBS cbs, cert_list; 1045 X509 *x = NULL; 1046 const unsigned char *q; 1047 STACK_OF(X509) *sk = NULL; 1048 SESS_CERT *sc; 1049 EVP_PKEY *pkey = NULL; 1050 1051 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1052 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 1053 if (!ok) 1054 return ((int)n); 1055 1056 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1057 S3I(s)->tmp.reuse_message = 1; 1058 return (1); 1059 } 1060 1061 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 1062 al = SSL_AD_UNEXPECTED_MESSAGE; 1063 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1064 goto f_err; 1065 } 1066 1067 1068 if ((sk = sk_X509_new_null()) == NULL) { 1069 SSLerror(s, ERR_R_MALLOC_FAILURE); 1070 goto err; 1071 } 1072 1073 if (n < 0) 1074 goto truncated; 1075 1076 CBS_init(&cbs, s->internal->init_msg, n); 1077 if (CBS_len(&cbs) < 3) 1078 goto truncated; 1079 1080 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1081 CBS_len(&cbs) != 0) { 1082 al = SSL_AD_DECODE_ERROR; 1083 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1084 goto f_err; 1085 } 1086 1087 while (CBS_len(&cert_list) > 0) { 1088 CBS cert; 1089 1090 if (CBS_len(&cert_list) < 3) 1091 goto truncated; 1092 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1093 al = SSL_AD_DECODE_ERROR; 1094 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1095 goto f_err; 1096 } 1097 1098 q = CBS_data(&cert); 1099 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1100 if (x == NULL) { 1101 al = SSL_AD_BAD_CERTIFICATE; 1102 SSLerror(s, ERR_R_ASN1_LIB); 1103 goto f_err; 1104 } 1105 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1106 al = SSL_AD_DECODE_ERROR; 1107 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1108 goto f_err; 1109 } 1110 if (!sk_X509_push(sk, x)) { 1111 SSLerror(s, ERR_R_MALLOC_FAILURE); 1112 goto err; 1113 } 1114 x = NULL; 1115 } 1116 1117 i = ssl_verify_cert_chain(s, sk); 1118 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1119 al = ssl_verify_alarm_type(s->verify_result); 1120 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1121 goto f_err; 1122 1123 } 1124 ERR_clear_error(); /* but we keep s->verify_result */ 1125 1126 sc = ssl_sess_cert_new(); 1127 if (sc == NULL) 1128 goto err; 1129 ssl_sess_cert_free(SSI(s)->sess_cert); 1130 SSI(s)->sess_cert = sc; 1131 1132 sc->cert_chain = sk; 1133 /* 1134 * Inconsistency alert: cert_chain does include the peer's 1135 * certificate, which we don't include in s3_srvr.c 1136 */ 1137 x = sk_X509_value(sk, 0); 1138 sk = NULL; 1139 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1140 1141 pkey = X509_get_pubkey(x); 1142 1143 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1144 x = NULL; 1145 al = SSL3_AL_FATAL; 1146 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1147 goto f_err; 1148 } 1149 1150 i = ssl_cert_type(x, pkey); 1151 if (i < 0) { 1152 x = NULL; 1153 al = SSL3_AL_FATAL; 1154 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1155 goto f_err; 1156 } 1157 1158 sc->peer_cert_type = i; 1159 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1160 /* 1161 * Why would the following ever happen? 1162 * We just created sc a couple of lines ago. 1163 */ 1164 X509_free(sc->peer_pkeys[i].x509); 1165 sc->peer_pkeys[i].x509 = x; 1166 sc->peer_key = &(sc->peer_pkeys[i]); 1167 1168 X509_free(s->session->peer); 1169 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1170 s->session->peer = x; 1171 s->session->verify_result = s->verify_result; 1172 1173 x = NULL; 1174 ret = 1; 1175 1176 if (0) { 1177 truncated: 1178 /* wrong packet length */ 1179 al = SSL_AD_DECODE_ERROR; 1180 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1181 f_err: 1182 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1183 } 1184 err: 1185 EVP_PKEY_free(pkey); 1186 X509_free(x); 1187 sk_X509_pop_free(sk, X509_free); 1188 1189 return (ret); 1190 } 1191 1192 static int 1193 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1194 { 1195 CBS dhp, dhg, dhpk; 1196 BN_CTX *bn_ctx = NULL; 1197 SESS_CERT *sc = NULL; 1198 DH *dh = NULL; 1199 long alg_a; 1200 int al; 1201 1202 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1203 sc = SSI(s)->sess_cert; 1204 1205 if ((dh = DH_new()) == NULL) { 1206 SSLerror(s, ERR_R_DH_LIB); 1207 goto err; 1208 } 1209 1210 if (!CBS_get_u16_length_prefixed(cbs, &dhp)) 1211 goto truncated; 1212 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1213 SSLerror(s, ERR_R_BN_LIB); 1214 goto err; 1215 } 1216 1217 if (!CBS_get_u16_length_prefixed(cbs, &dhg)) 1218 goto truncated; 1219 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1220 SSLerror(s, ERR_R_BN_LIB); 1221 goto err; 1222 } 1223 1224 if (!CBS_get_u16_length_prefixed(cbs, &dhpk)) 1225 goto truncated; 1226 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1227 NULL)) == NULL) { 1228 SSLerror(s, ERR_R_BN_LIB); 1229 goto err; 1230 } 1231 1232 /* 1233 * Check the strength of the DH key just constructed. 1234 * Discard keys weaker than 1024 bits. 1235 */ 1236 if (DH_size(dh) < 1024 / 8) { 1237 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1238 goto err; 1239 } 1240 1241 if (alg_a & SSL_aRSA) 1242 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1243 else 1244 /* XXX - Anonymous DH, so no certificate or pkey. */ 1245 *pkey = NULL; 1246 1247 sc->peer_dh_tmp = dh; 1248 1249 return (1); 1250 1251 truncated: 1252 al = SSL_AD_DECODE_ERROR; 1253 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1254 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1255 1256 err: 1257 DH_free(dh); 1258 BN_CTX_free(bn_ctx); 1259 1260 return (-1); 1261 } 1262 1263 static int 1264 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1265 { 1266 EC_KEY *ecdh = NULL; 1267 int ret = -1; 1268 1269 /* Extract the server's ephemeral ECDH public key. */ 1270 if ((ecdh = EC_KEY_new()) == NULL) { 1271 SSLerror(s, ERR_R_MALLOC_FAILURE); 1272 goto err; 1273 } 1274 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh, nid, public)) { 1275 SSLerror(s, SSL_R_BAD_ECPOINT); 1276 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1277 goto err; 1278 } 1279 1280 sc->peer_nid = nid; 1281 sc->peer_ecdh_tmp = ecdh; 1282 ecdh = NULL; 1283 1284 ret = 1; 1285 1286 err: 1287 EC_KEY_free(ecdh); 1288 1289 return (ret); 1290 } 1291 1292 static int 1293 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1294 { 1295 size_t outlen; 1296 1297 if (nid != NID_X25519) { 1298 SSLerror(s, ERR_R_INTERNAL_ERROR); 1299 goto err; 1300 } 1301 1302 if (CBS_len(public) != X25519_KEY_LENGTH) { 1303 SSLerror(s, SSL_R_BAD_ECPOINT); 1304 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1305 goto err; 1306 } 1307 1308 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1309 SSLerror(s, ERR_R_MALLOC_FAILURE); 1310 goto err; 1311 } 1312 1313 return (1); 1314 1315 err: 1316 return (-1); 1317 } 1318 1319 static int 1320 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1321 { 1322 CBS public; 1323 uint8_t curve_type; 1324 uint16_t curve_id; 1325 SESS_CERT *sc; 1326 long alg_a; 1327 int nid; 1328 int al; 1329 1330 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1331 sc = SSI(s)->sess_cert; 1332 1333 /* Only named curves are supported. */ 1334 if (!CBS_get_u8(cbs, &curve_type) || 1335 curve_type != NAMED_CURVE_TYPE || 1336 !CBS_get_u16(cbs, &curve_id)) { 1337 al = SSL_AD_DECODE_ERROR; 1338 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1339 goto f_err; 1340 } 1341 1342 /* 1343 * Check that the curve is one of our preferences - if it is not, 1344 * the server has sent us an invalid curve. 1345 */ 1346 if (tls1_check_curve(s, curve_id) != 1) { 1347 al = SSL_AD_DECODE_ERROR; 1348 SSLerror(s, SSL_R_WRONG_CURVE); 1349 goto f_err; 1350 } 1351 1352 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1353 al = SSL_AD_INTERNAL_ERROR; 1354 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1355 goto f_err; 1356 } 1357 1358 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1359 goto truncated; 1360 1361 if (nid == NID_X25519) { 1362 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1363 goto err; 1364 } else { 1365 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1366 goto err; 1367 } 1368 1369 /* 1370 * The ECC/TLS specification does not mention the use of DSA to sign 1371 * ECParameters in the server key exchange message. We do support RSA 1372 * and ECDSA. 1373 */ 1374 if (alg_a & SSL_aRSA) 1375 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1376 else if (alg_a & SSL_aECDSA) 1377 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1378 else 1379 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1380 *pkey = NULL; 1381 1382 return (1); 1383 1384 truncated: 1385 al = SSL_AD_DECODE_ERROR; 1386 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1387 1388 f_err: 1389 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1390 1391 err: 1392 return (-1); 1393 } 1394 1395 int 1396 ssl3_get_server_key_exchange(SSL *s) 1397 { 1398 CBS cbs, signature; 1399 const EVP_MD *md = NULL; 1400 EVP_PKEY *pkey = NULL; 1401 EVP_MD_CTX md_ctx; 1402 const unsigned char *param; 1403 long n, alg_k, alg_a; 1404 int al, ok; 1405 size_t param_len; 1406 1407 EVP_MD_CTX_init(&md_ctx); 1408 1409 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1410 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1411 1412 /* 1413 * Use same message size as in ssl3_get_certificate_request() 1414 * as ServerKeyExchange message may be skipped. 1415 */ 1416 n = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1417 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1418 if (!ok) 1419 return ((int)n); 1420 1421 if (n < 0) 1422 goto err; 1423 1424 CBS_init(&cbs, s->internal->init_msg, n); 1425 1426 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1427 /* 1428 * Do not skip server key exchange if this cipher suite uses 1429 * ephemeral keys. 1430 */ 1431 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1432 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1433 al = SSL_AD_UNEXPECTED_MESSAGE; 1434 goto f_err; 1435 } 1436 1437 S3I(s)->tmp.reuse_message = 1; 1438 EVP_MD_CTX_cleanup(&md_ctx); 1439 return (1); 1440 } 1441 1442 if (SSI(s)->sess_cert != NULL) { 1443 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1444 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1445 1446 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1447 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1448 1449 free(SSI(s)->sess_cert->peer_x25519_tmp); 1450 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1451 } else { 1452 SSI(s)->sess_cert = ssl_sess_cert_new(); 1453 if (SSI(s)->sess_cert == NULL) 1454 goto err; 1455 } 1456 1457 param = CBS_data(&cbs); 1458 param_len = CBS_len(&cbs); 1459 1460 if (alg_k & SSL_kDHE) { 1461 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1) 1462 goto err; 1463 } else if (alg_k & SSL_kECDHE) { 1464 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1) 1465 goto err; 1466 } else if (alg_k != 0) { 1467 al = SSL_AD_UNEXPECTED_MESSAGE; 1468 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1469 goto f_err; 1470 } 1471 1472 param_len -= CBS_len(&cbs); 1473 1474 /* if it was signed, check the signature */ 1475 if (pkey != NULL) { 1476 EVP_PKEY_CTX *pctx; 1477 const struct ssl_sigalg *sigalg; 1478 1479 if (SSL_USE_SIGALGS(s)) { 1480 uint16_t sigalg_value; 1481 1482 if (!CBS_get_u16(&cbs, &sigalg_value)) 1483 goto truncated; 1484 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, 1485 tls12_sigalgs_len)) == NULL) { 1486 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1487 al = SSL_AD_DECODE_ERROR; 1488 goto f_err; 1489 } 1490 if ((md = sigalg->md()) == NULL) { 1491 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1492 al = SSL_AD_DECODE_ERROR; 1493 goto f_err; 1494 } 1495 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) { 1496 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 1497 al = SSL_AD_DECODE_ERROR; 1498 goto f_err; 1499 } 1500 } else if (pkey->type == EVP_PKEY_RSA) { 1501 sigalg = ssl_sigalg_lookup(SIGALG_RSA_PKCS1_MD5_SHA1); 1502 } else if (pkey->type == EVP_PKEY_EC) { 1503 sigalg = ssl_sigalg_lookup(SIGALG_ECDSA_SHA1); 1504 } else { 1505 SSLerror(s, SSL_R_UNKNOWN_PKEY_TYPE); 1506 al = SSL_AD_DECODE_ERROR; 1507 goto f_err; 1508 } 1509 md = sigalg->md(); 1510 1511 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1512 goto truncated; 1513 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1514 al = SSL_AD_DECODE_ERROR; 1515 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1516 goto f_err; 1517 } 1518 1519 if (!EVP_DigestVerifyInit(&md_ctx, &pctx, md, NULL, pkey)) 1520 goto err; 1521 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->client_random, 1522 SSL3_RANDOM_SIZE)) 1523 goto err; 1524 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1525 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1526 RSA_PKCS1_PSS_PADDING) || 1527 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1528 goto err; 1529 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->server_random, 1530 SSL3_RANDOM_SIZE)) 1531 goto err; 1532 if (!EVP_DigestVerifyUpdate(&md_ctx, param, param_len)) 1533 goto err; 1534 if (EVP_DigestVerifyFinal(&md_ctx, CBS_data(&signature), 1535 CBS_len(&signature)) <= 0) { 1536 al = SSL_AD_DECRYPT_ERROR; 1537 SSLerror(s, SSL_R_BAD_SIGNATURE); 1538 goto f_err; 1539 } 1540 } else { 1541 /* aNULL does not need public keys. */ 1542 if (!(alg_a & SSL_aNULL)) { 1543 SSLerror(s, ERR_R_INTERNAL_ERROR); 1544 goto err; 1545 } 1546 } 1547 1548 if (CBS_len(&cbs) != 0) { 1549 al = SSL_AD_DECODE_ERROR; 1550 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1551 goto f_err; 1552 } 1553 1554 EVP_PKEY_free(pkey); 1555 EVP_MD_CTX_cleanup(&md_ctx); 1556 1557 return (1); 1558 1559 truncated: 1560 al = SSL_AD_DECODE_ERROR; 1561 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1562 1563 f_err: 1564 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1565 1566 err: 1567 EVP_PKEY_free(pkey); 1568 EVP_MD_CTX_cleanup(&md_ctx); 1569 1570 return (-1); 1571 } 1572 1573 int 1574 ssl3_get_certificate_request(SSL *s) 1575 { 1576 int ok, ret = 0; 1577 long n; 1578 uint8_t ctype_num; 1579 CBS cert_request, ctypes, rdn_list; 1580 X509_NAME *xn = NULL; 1581 const unsigned char *q; 1582 STACK_OF(X509_NAME) *ca_sk = NULL; 1583 1584 n = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1585 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1586 if (!ok) 1587 return ((int)n); 1588 1589 S3I(s)->tmp.cert_req = 0; 1590 1591 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_DONE) { 1592 S3I(s)->tmp.reuse_message = 1; 1593 /* 1594 * If we get here we don't need any cached handshake records 1595 * as we wont be doing client auth. 1596 */ 1597 tls1_transcript_free(s); 1598 return (1); 1599 } 1600 1601 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1602 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1603 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1604 goto err; 1605 } 1606 1607 /* TLS does not like anon-DH with client cert */ 1608 if (S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL) { 1609 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1610 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1611 goto err; 1612 } 1613 1614 if (n < 0) 1615 goto truncated; 1616 CBS_init(&cert_request, s->internal->init_msg, n); 1617 1618 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1619 SSLerror(s, ERR_R_MALLOC_FAILURE); 1620 goto err; 1621 } 1622 1623 /* get the certificate types */ 1624 if (!CBS_get_u8(&cert_request, &ctype_num)) 1625 goto truncated; 1626 1627 if (ctype_num > SSL3_CT_NUMBER) 1628 ctype_num = SSL3_CT_NUMBER; 1629 if (!CBS_get_bytes(&cert_request, &ctypes, ctype_num) || 1630 !CBS_write_bytes(&ctypes, (uint8_t *)S3I(s)->tmp.ctype, 1631 sizeof(S3I(s)->tmp.ctype), NULL)) { 1632 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1633 goto err; 1634 } 1635 1636 if (SSL_USE_SIGALGS(s)) { 1637 CBS sigalgs; 1638 1639 if (CBS_len(&cert_request) < 2) { 1640 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1641 goto err; 1642 } 1643 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1644 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1645 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1646 goto err; 1647 } 1648 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1649 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1650 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1651 goto err; 1652 } 1653 if (!CBS_stow(&sigalgs, &S3I(s)->hs.sigalgs, 1654 &S3I(s)->hs.sigalgs_len)) 1655 goto err; 1656 } 1657 1658 /* get the CA RDNs */ 1659 if (CBS_len(&cert_request) < 2) { 1660 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1661 goto err; 1662 } 1663 1664 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1665 CBS_len(&cert_request) != 0) { 1666 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1667 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1668 goto err; 1669 } 1670 1671 while (CBS_len(&rdn_list) > 0) { 1672 CBS rdn; 1673 1674 if (CBS_len(&rdn_list) < 2) { 1675 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1676 goto err; 1677 } 1678 1679 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1680 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1681 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1682 goto err; 1683 } 1684 1685 q = CBS_data(&rdn); 1686 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1687 ssl3_send_alert(s, SSL3_AL_FATAL, 1688 SSL_AD_DECODE_ERROR); 1689 SSLerror(s, ERR_R_ASN1_LIB); 1690 goto err; 1691 } 1692 1693 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1694 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1695 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1696 goto err; 1697 } 1698 if (!sk_X509_NAME_push(ca_sk, xn)) { 1699 SSLerror(s, ERR_R_MALLOC_FAILURE); 1700 goto err; 1701 } 1702 xn = NULL; /* avoid free in err block */ 1703 } 1704 1705 /* we should setup a certificate to return.... */ 1706 S3I(s)->tmp.cert_req = 1; 1707 S3I(s)->tmp.ctype_num = ctype_num; 1708 sk_X509_NAME_pop_free(S3I(s)->tmp.ca_names, X509_NAME_free); 1709 S3I(s)->tmp.ca_names = ca_sk; 1710 ca_sk = NULL; 1711 1712 ret = 1; 1713 if (0) { 1714 truncated: 1715 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1716 } 1717 err: 1718 X509_NAME_free(xn); 1719 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1720 return (ret); 1721 } 1722 1723 static int 1724 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1725 { 1726 return (X509_NAME_cmp(*a, *b)); 1727 } 1728 1729 int 1730 ssl3_get_new_session_ticket(SSL *s) 1731 { 1732 int ok, al, ret = 0; 1733 uint32_t lifetime_hint; 1734 long n; 1735 CBS cbs, session_ticket; 1736 1737 n = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1738 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1739 if (!ok) 1740 return ((int)n); 1741 1742 if (S3I(s)->tmp.message_type == SSL3_MT_FINISHED) { 1743 S3I(s)->tmp.reuse_message = 1; 1744 return (1); 1745 } 1746 if (S3I(s)->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) { 1747 al = SSL_AD_UNEXPECTED_MESSAGE; 1748 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1749 goto f_err; 1750 } 1751 1752 if (n < 0) { 1753 al = SSL_AD_DECODE_ERROR; 1754 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1755 goto f_err; 1756 } 1757 1758 CBS_init(&cbs, s->internal->init_msg, n); 1759 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1760 #if UINT32_MAX > LONG_MAX 1761 lifetime_hint > LONG_MAX || 1762 #endif 1763 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1764 CBS_len(&cbs) != 0) { 1765 al = SSL_AD_DECODE_ERROR; 1766 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1767 goto f_err; 1768 } 1769 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1770 1771 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1772 &s->session->tlsext_ticklen)) { 1773 SSLerror(s, ERR_R_MALLOC_FAILURE); 1774 goto err; 1775 } 1776 1777 /* 1778 * There are two ways to detect a resumed ticket sesion. 1779 * One is to set an appropriate session ID and then the server 1780 * must return a match in ServerHello. This allows the normal 1781 * client session ID matching to work and we know much 1782 * earlier that the ticket has been accepted. 1783 * 1784 * The other way is to set zero length session ID when the 1785 * ticket is presented and rely on the handshake to determine 1786 * session resumption. 1787 * 1788 * We choose the former approach because this fits in with 1789 * assumptions elsewhere in OpenSSL. The session ID is set 1790 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1791 * ticket. 1792 */ 1793 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1794 s->session->session_id, &s->session->session_id_length, 1795 EVP_sha256(), NULL); 1796 ret = 1; 1797 return (ret); 1798 f_err: 1799 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1800 err: 1801 return (-1); 1802 } 1803 1804 int 1805 ssl3_get_cert_status(SSL *s) 1806 { 1807 CBS cert_status, response; 1808 size_t stow_len; 1809 int ok, al; 1810 long n; 1811 uint8_t status_type; 1812 1813 n = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1814 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 1815 16384, &ok); 1816 if (!ok) 1817 return ((int)n); 1818 1819 if (n < 0) { 1820 /* need at least status type + length */ 1821 al = SSL_AD_DECODE_ERROR; 1822 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1823 goto f_err; 1824 } 1825 1826 CBS_init(&cert_status, s->internal->init_msg, n); 1827 if (!CBS_get_u8(&cert_status, &status_type) || 1828 CBS_len(&cert_status) < 3) { 1829 /* need at least status type + length */ 1830 al = SSL_AD_DECODE_ERROR; 1831 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1832 goto f_err; 1833 } 1834 1835 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1836 al = SSL_AD_DECODE_ERROR; 1837 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1838 goto f_err; 1839 } 1840 1841 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1842 CBS_len(&cert_status) != 0) { 1843 al = SSL_AD_DECODE_ERROR; 1844 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1845 goto f_err; 1846 } 1847 1848 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1849 &stow_len) || stow_len > INT_MAX) { 1850 s->internal->tlsext_ocsp_resplen = 0; 1851 al = SSL_AD_INTERNAL_ERROR; 1852 SSLerror(s, ERR_R_MALLOC_FAILURE); 1853 goto f_err; 1854 } 1855 s->internal->tlsext_ocsp_resplen = (int)stow_len; 1856 1857 if (s->ctx->internal->tlsext_status_cb) { 1858 int ret; 1859 ret = s->ctx->internal->tlsext_status_cb(s, 1860 s->ctx->internal->tlsext_status_arg); 1861 if (ret == 0) { 1862 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1863 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1864 goto f_err; 1865 } 1866 if (ret < 0) { 1867 al = SSL_AD_INTERNAL_ERROR; 1868 SSLerror(s, ERR_R_MALLOC_FAILURE); 1869 goto f_err; 1870 } 1871 } 1872 return (1); 1873 f_err: 1874 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1875 return (-1); 1876 } 1877 1878 int 1879 ssl3_get_server_done(SSL *s) 1880 { 1881 int ok, ret = 0; 1882 long n; 1883 1884 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1885 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1886 30, /* should be very small, like 0 :-) */ &ok); 1887 if (!ok) 1888 return ((int)n); 1889 1890 if (n > 0) { 1891 /* should contain no data */ 1892 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1893 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1894 return (-1); 1895 } 1896 ret = 1; 1897 return (ret); 1898 } 1899 1900 static int 1901 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1902 { 1903 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1904 unsigned char *enc_pms = NULL; 1905 EVP_PKEY *pkey = NULL; 1906 int ret = -1; 1907 int enc_len; 1908 CBB epms; 1909 1910 /* 1911 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1912 */ 1913 1914 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1915 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1916 pkey->pkey.rsa == NULL) { 1917 SSLerror(s, ERR_R_INTERNAL_ERROR); 1918 goto err; 1919 } 1920 1921 pms[0] = s->client_version >> 8; 1922 pms[1] = s->client_version & 0xff; 1923 arc4random_buf(&pms[2], sizeof(pms) - 2); 1924 1925 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1926 SSLerror(s, ERR_R_MALLOC_FAILURE); 1927 goto err; 1928 } 1929 1930 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 1931 RSA_PKCS1_PADDING); 1932 if (enc_len <= 0) { 1933 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1934 goto err; 1935 } 1936 1937 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1938 goto err; 1939 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 1940 goto err; 1941 if (!CBB_flush(cbb)) 1942 goto err; 1943 1944 s->session->master_key_length = 1945 tls1_generate_master_secret(s, 1946 s->session->master_key, pms, sizeof(pms)); 1947 1948 ret = 1; 1949 1950 err: 1951 explicit_bzero(pms, sizeof(pms)); 1952 EVP_PKEY_free(pkey); 1953 free(enc_pms); 1954 1955 return (ret); 1956 } 1957 1958 static int 1959 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1960 { 1961 DH *dh_srvr = NULL, *dh_clnt = NULL; 1962 unsigned char *key = NULL; 1963 int key_size = 0, key_len; 1964 unsigned char *data; 1965 int ret = -1; 1966 CBB dh_Yc; 1967 1968 /* Ensure that we have an ephemeral key for DHE. */ 1969 if (sess_cert->peer_dh_tmp == NULL) { 1970 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1971 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1972 goto err; 1973 } 1974 dh_srvr = sess_cert->peer_dh_tmp; 1975 1976 /* Generate a new random key. */ 1977 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 1978 SSLerror(s, ERR_R_DH_LIB); 1979 goto err; 1980 } 1981 if (!DH_generate_key(dh_clnt)) { 1982 SSLerror(s, ERR_R_DH_LIB); 1983 goto err; 1984 } 1985 if ((key_size = DH_size(dh_clnt)) <= 0) { 1986 SSLerror(s, ERR_R_DH_LIB); 1987 goto err; 1988 } 1989 if ((key = malloc(key_size)) == NULL) { 1990 SSLerror(s, ERR_R_MALLOC_FAILURE); 1991 goto err; 1992 } 1993 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) { 1994 SSLerror(s, ERR_R_DH_LIB); 1995 goto err; 1996 } 1997 1998 /* Generate master key from the result. */ 1999 s->session->master_key_length = 2000 tls1_generate_master_secret(s, 2001 s->session->master_key, key, key_len); 2002 2003 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2004 goto err; 2005 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2006 goto err; 2007 BN_bn2bin(dh_clnt->pub_key, data); 2008 if (!CBB_flush(cbb)) 2009 goto err; 2010 2011 ret = 1; 2012 2013 err: 2014 DH_free(dh_clnt); 2015 freezero(key, key_size); 2016 2017 return (ret); 2018 } 2019 2020 static int 2021 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2022 { 2023 EC_KEY *ecdh = NULL; 2024 uint8_t *key = NULL; 2025 size_t key_len = 0; 2026 int ret = -1; 2027 CBB ecpoint; 2028 2029 if ((ecdh = EC_KEY_new()) == NULL) { 2030 SSLerror(s, ERR_R_MALLOC_FAILURE); 2031 goto err; 2032 } 2033 2034 if (!ssl_kex_generate_ecdhe_ecp(ecdh, sc->peer_nid)) 2035 goto err; 2036 2037 /* Encode our public key. */ 2038 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2039 goto err; 2040 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 2041 goto err; 2042 if (!CBB_flush(cbb)) 2043 goto err; 2044 2045 if (!ssl_kex_derive_ecdhe_ecp(ecdh, sc->peer_ecdh_tmp, &key, &key_len)) 2046 goto err; 2047 s->session->master_key_length = tls1_generate_master_secret(s, 2048 s->session->master_key, key, key_len); 2049 2050 ret = 1; 2051 2052 err: 2053 freezero(key, key_len); 2054 EC_KEY_free(ecdh); 2055 2056 return (ret); 2057 } 2058 2059 static int 2060 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2061 { 2062 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2063 int ret = -1; 2064 CBB ecpoint; 2065 2066 /* Generate X25519 key pair and derive shared key. */ 2067 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2068 goto err; 2069 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2070 goto err; 2071 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2072 goto err; 2073 X25519_keypair(public_key, private_key); 2074 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2075 goto err; 2076 2077 /* Serialize the public key. */ 2078 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2079 goto err; 2080 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2081 goto err; 2082 if (!CBB_flush(cbb)) 2083 goto err; 2084 2085 /* Generate master key from the result. */ 2086 s->session->master_key_length = 2087 tls1_generate_master_secret(s, 2088 s->session->master_key, shared_key, X25519_KEY_LENGTH); 2089 2090 ret = 1; 2091 2092 err: 2093 free(public_key); 2094 freezero(private_key, X25519_KEY_LENGTH); 2095 freezero(shared_key, X25519_KEY_LENGTH); 2096 2097 return (ret); 2098 } 2099 2100 static int 2101 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2102 { 2103 if (sc->peer_x25519_tmp != NULL) { 2104 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2105 goto err; 2106 } else if (sc->peer_ecdh_tmp != NULL) { 2107 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2108 goto err; 2109 } else { 2110 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2111 SSLerror(s, ERR_R_INTERNAL_ERROR); 2112 goto err; 2113 } 2114 2115 return (1); 2116 2117 err: 2118 return (-1); 2119 } 2120 2121 static int 2122 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2123 { 2124 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2125 EVP_PKEY *pub_key = NULL; 2126 EVP_PKEY_CTX *pkey_ctx; 2127 X509 *peer_cert; 2128 size_t msglen; 2129 unsigned int md_len; 2130 EVP_MD_CTX *ukm_hash; 2131 int ret = -1; 2132 int nid; 2133 CBB gostblob; 2134 2135 /* Get server sertificate PKEY and create ctx from it */ 2136 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2137 if (peer_cert == NULL) { 2138 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2139 goto err; 2140 } 2141 2142 pub_key = X509_get_pubkey(peer_cert); 2143 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2144 2145 /* 2146 * If we have send a certificate, and certificate key parameters match 2147 * those of server certificate, use certificate key for key exchange. 2148 * Otherwise, generate ephemeral key pair. 2149 */ 2150 EVP_PKEY_encrypt_init(pkey_ctx); 2151 2152 /* Generate session key. */ 2153 arc4random_buf(premaster_secret, 32); 2154 2155 /* 2156 * If we have client certificate, use its secret as peer key. 2157 */ 2158 if (S3I(s)->tmp.cert_req && s->cert->key->privatekey) { 2159 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2160 s->cert->key->privatekey) <=0) { 2161 /* 2162 * If there was an error - just ignore it. 2163 * Ephemeral key would be used. 2164 */ 2165 ERR_clear_error(); 2166 } 2167 } 2168 2169 /* 2170 * Compute shared IV and store it in algorithm-specific context data. 2171 */ 2172 ukm_hash = EVP_MD_CTX_new(); 2173 if (ukm_hash == NULL) { 2174 SSLerror(s, ERR_R_MALLOC_FAILURE); 2175 goto err; 2176 } 2177 2178 if (ssl_get_algorithm2(s) & SSL_HANDSHAKE_MAC_GOST94) 2179 nid = NID_id_GostR3411_94; 2180 else 2181 nid = NID_id_tc26_gost3411_2012_256; 2182 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2183 goto err; 2184 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2185 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2186 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2187 EVP_MD_CTX_free(ukm_hash); 2188 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2189 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2190 SSLerror(s, SSL_R_LIBRARY_BUG); 2191 goto err; 2192 } 2193 2194 /* 2195 * Make GOST keytransport blob message, encapsulate it into sequence. 2196 */ 2197 msglen = 255; 2198 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2199 32) < 0) { 2200 SSLerror(s, SSL_R_LIBRARY_BUG); 2201 goto err; 2202 } 2203 2204 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2205 goto err; 2206 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2207 goto err; 2208 if (!CBB_flush(cbb)) 2209 goto err; 2210 2211 /* Check if pubkey from client certificate was used. */ 2212 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2213 NULL) > 0) { 2214 /* Set flag "skip certificate verify". */ 2215 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2216 } 2217 EVP_PKEY_CTX_free(pkey_ctx); 2218 s->session->master_key_length = 2219 tls1_generate_master_secret(s, 2220 s->session->master_key, premaster_secret, 32); 2221 2222 ret = 1; 2223 2224 err: 2225 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2226 EVP_PKEY_free(pub_key); 2227 2228 return (ret); 2229 } 2230 2231 int 2232 ssl3_send_client_key_exchange(SSL *s) 2233 { 2234 SESS_CERT *sess_cert; 2235 unsigned long alg_k; 2236 CBB cbb, kex; 2237 2238 memset(&cbb, 0, sizeof(cbb)); 2239 2240 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2241 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2242 2243 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2244 ssl3_send_alert(s, SSL3_AL_FATAL, 2245 SSL_AD_UNEXPECTED_MESSAGE); 2246 SSLerror(s, ERR_R_INTERNAL_ERROR); 2247 goto err; 2248 } 2249 2250 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2251 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2252 goto err; 2253 2254 if (alg_k & SSL_kRSA) { 2255 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2256 goto err; 2257 } else if (alg_k & SSL_kDHE) { 2258 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2259 goto err; 2260 } else if (alg_k & SSL_kECDHE) { 2261 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2262 goto err; 2263 } else if (alg_k & SSL_kGOST) { 2264 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2265 goto err; 2266 } else { 2267 ssl3_send_alert(s, SSL3_AL_FATAL, 2268 SSL_AD_HANDSHAKE_FAILURE); 2269 SSLerror(s, ERR_R_INTERNAL_ERROR); 2270 goto err; 2271 } 2272 2273 if (!ssl3_handshake_msg_finish(s, &cbb)) 2274 goto err; 2275 2276 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2277 } 2278 2279 /* SSL3_ST_CW_KEY_EXCH_B */ 2280 return (ssl3_handshake_write(s)); 2281 2282 err: 2283 CBB_cleanup(&cbb); 2284 2285 return (-1); 2286 } 2287 2288 static int 2289 ssl3_send_client_verify_sigalgs(SSL *s, CBB *cert_verify) 2290 { 2291 const struct ssl_sigalg *sigalg; 2292 CBB cbb_signature; 2293 EVP_PKEY_CTX *pctx = NULL; 2294 EVP_PKEY *pkey; 2295 EVP_MD_CTX mctx; 2296 const EVP_MD *md; 2297 const unsigned char *hdata; 2298 unsigned char *signature = NULL; 2299 size_t signature_len, hdata_len; 2300 int ret = 0; 2301 2302 EVP_MD_CTX_init(&mctx); 2303 2304 pkey = s->cert->key->privatekey; 2305 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2306 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2307 goto err; 2308 } 2309 if ((md = sigalg->md()) == NULL) { 2310 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 2311 goto err; 2312 } 2313 2314 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2315 SSLerror(s, ERR_R_INTERNAL_ERROR); 2316 goto err; 2317 } 2318 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2319 SSLerror(s, ERR_R_EVP_LIB); 2320 goto err; 2321 } 2322 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2323 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2324 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2325 SSLerror(s, ERR_R_EVP_LIB); 2326 goto err; 2327 } 2328 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2329 SSLerror(s, ERR_R_EVP_LIB); 2330 goto err; 2331 } 2332 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2333 signature_len == 0) { 2334 SSLerror(s, ERR_R_EVP_LIB); 2335 goto err; 2336 } 2337 if ((signature = calloc(1, signature_len)) == NULL) { 2338 SSLerror(s, ERR_R_MALLOC_FAILURE); 2339 goto err; 2340 } 2341 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2342 SSLerror(s, ERR_R_EVP_LIB); 2343 goto err; 2344 } 2345 2346 if (!CBB_add_u16(cert_verify, sigalg->value)) 2347 goto err; 2348 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2349 goto err; 2350 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2351 goto err; 2352 if (!CBB_flush(cert_verify)) 2353 goto err; 2354 2355 ret = 1; 2356 2357 err: 2358 EVP_MD_CTX_cleanup(&mctx); 2359 free(signature); 2360 return ret; 2361 } 2362 2363 static int 2364 ssl3_send_client_verify_rsa(SSL *s, CBB *cert_verify) 2365 { 2366 CBB cbb_signature; 2367 EVP_PKEY *pkey; 2368 unsigned char data[EVP_MAX_MD_SIZE]; 2369 unsigned char *signature = NULL; 2370 unsigned int signature_len; 2371 size_t data_len; 2372 int ret = 0; 2373 2374 pkey = s->cert->key->privatekey; 2375 2376 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2377 goto err; 2378 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2379 goto err; 2380 if (RSA_sign(NID_md5_sha1, data, data_len, signature, 2381 &signature_len, pkey->pkey.rsa) <= 0 ) { 2382 SSLerror(s, ERR_R_RSA_LIB); 2383 goto err; 2384 } 2385 2386 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2387 goto err; 2388 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2389 goto err; 2390 if (!CBB_flush(cert_verify)) 2391 goto err; 2392 2393 ret = 1; 2394 err: 2395 free(signature); 2396 return ret; 2397 } 2398 2399 static int 2400 ssl3_send_client_verify_ec(SSL *s, CBB *cert_verify) 2401 { 2402 CBB cbb_signature; 2403 EVP_PKEY *pkey; 2404 unsigned char data[EVP_MAX_MD_SIZE]; 2405 unsigned char *signature = NULL; 2406 unsigned int signature_len; 2407 int ret = 0; 2408 2409 pkey = s->cert->key->privatekey; 2410 2411 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2412 goto err; 2413 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2414 goto err; 2415 if (!ECDSA_sign(pkey->save_type, &data[MD5_DIGEST_LENGTH], 2416 SHA_DIGEST_LENGTH, signature, &signature_len, pkey->pkey.ec)) { 2417 SSLerror(s, ERR_R_ECDSA_LIB); 2418 goto err; 2419 } 2420 2421 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2422 goto err; 2423 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2424 goto err; 2425 if (!CBB_flush(cert_verify)) 2426 goto err; 2427 2428 ret = 1; 2429 err: 2430 free(signature); 2431 return ret; 2432 } 2433 2434 #ifndef OPENSSL_NO_GOST 2435 static int 2436 ssl3_send_client_verify_gost(SSL *s, CBB *cert_verify) 2437 { 2438 CBB cbb_signature; 2439 EVP_MD_CTX mctx; 2440 EVP_PKEY_CTX *pctx; 2441 EVP_PKEY *pkey; 2442 const EVP_MD *md; 2443 const unsigned char *hdata; 2444 unsigned char *signature = NULL; 2445 size_t signature_len; 2446 size_t hdata_len; 2447 int nid; 2448 int ret = 0; 2449 2450 EVP_MD_CTX_init(&mctx); 2451 2452 pkey = s->cert->key->privatekey; 2453 2454 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2455 SSLerror(s, ERR_R_INTERNAL_ERROR); 2456 goto err; 2457 } 2458 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2459 (md = EVP_get_digestbynid(nid)) == NULL) { 2460 SSLerror(s, ERR_R_EVP_LIB); 2461 goto err; 2462 } 2463 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2464 SSLerror(s, ERR_R_EVP_LIB); 2465 goto err; 2466 } 2467 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2468 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2469 SSLerror(s, ERR_R_EVP_LIB); 2470 goto err; 2471 } 2472 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2473 SSLerror(s, ERR_R_EVP_LIB); 2474 goto err; 2475 } 2476 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2477 signature_len == 0) { 2478 SSLerror(s, ERR_R_EVP_LIB); 2479 goto err; 2480 } 2481 if ((signature = calloc(1, signature_len)) == NULL) { 2482 SSLerror(s, ERR_R_MALLOC_FAILURE); 2483 goto err; 2484 } 2485 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2486 SSLerror(s, ERR_R_EVP_LIB); 2487 goto err; 2488 } 2489 2490 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2491 goto err; 2492 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2493 goto err; 2494 if (!CBB_flush(cert_verify)) 2495 goto err; 2496 2497 ret = 1; 2498 err: 2499 EVP_MD_CTX_cleanup(&mctx); 2500 free(signature); 2501 return ret; 2502 } 2503 #endif 2504 2505 int 2506 ssl3_send_client_verify(SSL *s) 2507 { 2508 CBB cbb, cert_verify; 2509 EVP_PKEY *pkey; 2510 2511 memset(&cbb, 0, sizeof(cbb)); 2512 2513 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2514 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2515 SSL3_MT_CERTIFICATE_VERIFY)) 2516 goto err; 2517 2518 pkey = s->cert->key->privatekey; 2519 2520 /* 2521 * For TLS v1.2 send signature algorithm and signature 2522 * using agreed digest and cached handshake records. 2523 */ 2524 if (SSL_USE_SIGALGS(s)) { 2525 if (!ssl3_send_client_verify_sigalgs(s, &cert_verify)) 2526 goto err; 2527 } else if (pkey->type == EVP_PKEY_RSA) { 2528 if (!ssl3_send_client_verify_rsa(s, &cert_verify)) 2529 goto err; 2530 } else if (pkey->type == EVP_PKEY_EC) { 2531 if (!ssl3_send_client_verify_ec(s, &cert_verify)) 2532 goto err; 2533 #ifndef OPENSSL_NO_GOST 2534 } else if (pkey->type == NID_id_GostR3410_94 || 2535 pkey->type == NID_id_GostR3410_2001) { 2536 if (!ssl3_send_client_verify_gost(s, &cert_verify)) 2537 goto err; 2538 #endif 2539 } else { 2540 SSLerror(s, ERR_R_INTERNAL_ERROR); 2541 goto err; 2542 } 2543 2544 tls1_transcript_free(s); 2545 2546 if (!ssl3_handshake_msg_finish(s, &cbb)) 2547 goto err; 2548 2549 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2550 } 2551 2552 return (ssl3_handshake_write(s)); 2553 2554 err: 2555 CBB_cleanup(&cbb); 2556 2557 return (-1); 2558 } 2559 2560 int 2561 ssl3_send_client_certificate(SSL *s) 2562 { 2563 EVP_PKEY *pkey = NULL; 2564 X509 *x509 = NULL; 2565 CBB cbb, client_cert; 2566 int i; 2567 2568 memset(&cbb, 0, sizeof(cbb)); 2569 2570 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2571 if (s->cert->key->x509 == NULL || 2572 s->cert->key->privatekey == NULL) 2573 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2574 else 2575 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2576 } 2577 2578 /* We need to get a client cert */ 2579 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2580 /* 2581 * If we get an error, we need to 2582 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 2583 * We then get retied later 2584 */ 2585 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2586 if (i < 0) { 2587 s->internal->rwstate = SSL_X509_LOOKUP; 2588 return (-1); 2589 } 2590 s->internal->rwstate = SSL_NOTHING; 2591 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2592 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2593 if (!SSL_use_certificate(s, x509) || 2594 !SSL_use_PrivateKey(s, pkey)) 2595 i = 0; 2596 } else if (i == 1) { 2597 i = 0; 2598 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2599 } 2600 2601 X509_free(x509); 2602 EVP_PKEY_free(pkey); 2603 if (i == 0) { 2604 S3I(s)->tmp.cert_req = 2; 2605 2606 /* There is no client certificate to verify. */ 2607 tls1_transcript_free(s); 2608 } 2609 2610 /* Ok, we have a cert */ 2611 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2612 } 2613 2614 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2615 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2616 SSL3_MT_CERTIFICATE)) 2617 goto err; 2618 if (!ssl3_output_cert_chain(s, &client_cert, 2619 (S3I(s)->tmp.cert_req == 2) ? NULL : s->cert->key)) 2620 goto err; 2621 if (!ssl3_handshake_msg_finish(s, &cbb)) 2622 goto err; 2623 2624 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2625 } 2626 2627 /* SSL3_ST_CW_CERT_D */ 2628 return (ssl3_handshake_write(s)); 2629 2630 err: 2631 CBB_cleanup(&cbb); 2632 2633 return (0); 2634 } 2635 2636 #define has_bits(i,m) (((i)&(m)) == (m)) 2637 2638 int 2639 ssl3_check_cert_and_algorithm(SSL *s) 2640 { 2641 int i, idx; 2642 long alg_k, alg_a; 2643 EVP_PKEY *pkey = NULL; 2644 SESS_CERT *sc; 2645 DH *dh; 2646 2647 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2648 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 2649 2650 /* We don't have a certificate. */ 2651 if (alg_a & SSL_aNULL) 2652 return (1); 2653 2654 sc = SSI(s)->sess_cert; 2655 if (sc == NULL) { 2656 SSLerror(s, ERR_R_INTERNAL_ERROR); 2657 goto err; 2658 } 2659 dh = SSI(s)->sess_cert->peer_dh_tmp; 2660 2661 /* This is the passed certificate. */ 2662 2663 idx = sc->peer_cert_type; 2664 if (idx == SSL_PKEY_ECC) { 2665 if (ssl_check_srvr_ecc_cert_and_alg( 2666 sc->peer_pkeys[idx].x509, s) == 0) { 2667 /* check failed */ 2668 SSLerror(s, SSL_R_BAD_ECC_CERT); 2669 goto f_err; 2670 } else { 2671 return (1); 2672 } 2673 } 2674 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2675 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2676 EVP_PKEY_free(pkey); 2677 2678 /* Check that we have a certificate if we require one. */ 2679 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2680 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2681 goto f_err; 2682 } 2683 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2684 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2685 goto f_err; 2686 } 2687 if ((alg_k & SSL_kDHE) && 2688 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2689 SSLerror(s, SSL_R_MISSING_DH_KEY); 2690 goto f_err; 2691 } 2692 2693 return (1); 2694 f_err: 2695 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2696 err: 2697 return (0); 2698 } 2699 2700 /* 2701 * Check to see if handshake is full or resumed. Usually this is just a 2702 * case of checking to see if a cache hit has occurred. In the case of 2703 * session tickets we have to check the next message to be sure. 2704 */ 2705 2706 int 2707 ssl3_check_finished(SSL *s) 2708 { 2709 int ok; 2710 long n; 2711 2712 /* If we have no ticket it cannot be a resumed session. */ 2713 if (!s->session->tlsext_tick) 2714 return (1); 2715 /* this function is called when we really expect a Certificate 2716 * message, so permit appropriate message length */ 2717 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2718 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2719 if (!ok) 2720 return ((int)n); 2721 2722 S3I(s)->tmp.reuse_message = 1; 2723 if ((S3I(s)->tmp.message_type == SSL3_MT_FINISHED) || 2724 (S3I(s)->tmp.message_type == SSL3_MT_NEWSESSION_TICKET)) 2725 return (2); 2726 2727 return (1); 2728 } 2729 2730 int 2731 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2732 { 2733 int i = 0; 2734 2735 #ifndef OPENSSL_NO_ENGINE 2736 if (s->ctx->internal->client_cert_engine) { 2737 i = ENGINE_load_ssl_client_cert( 2738 s->ctx->internal->client_cert_engine, s, 2739 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2740 if (i != 0) 2741 return (i); 2742 } 2743 #endif 2744 if (s->ctx->internal->client_cert_cb) 2745 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2746 return (i); 2747 } 2748