1 /* $OpenBSD: ssl_clnt.c,v 1.55 2019/01/23 18:39:28 beck 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 = s->method->internal->ssl_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_handshake_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 = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_A, 1052 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 1053 1054 if (!ok) 1055 return ((int)n); 1056 1057 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1058 S3I(s)->tmp.reuse_message = 1; 1059 return (1); 1060 } 1061 1062 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 1063 al = SSL_AD_UNEXPECTED_MESSAGE; 1064 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1065 goto f_err; 1066 } 1067 1068 1069 if ((sk = sk_X509_new_null()) == NULL) { 1070 SSLerror(s, ERR_R_MALLOC_FAILURE); 1071 goto err; 1072 } 1073 1074 if (n < 0) 1075 goto truncated; 1076 1077 CBS_init(&cbs, s->internal->init_msg, n); 1078 if (CBS_len(&cbs) < 3) 1079 goto truncated; 1080 1081 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1082 CBS_len(&cbs) != 0) { 1083 al = SSL_AD_DECODE_ERROR; 1084 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1085 goto f_err; 1086 } 1087 1088 while (CBS_len(&cert_list) > 0) { 1089 CBS cert; 1090 1091 if (CBS_len(&cert_list) < 3) 1092 goto truncated; 1093 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1094 al = SSL_AD_DECODE_ERROR; 1095 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1096 goto f_err; 1097 } 1098 1099 q = CBS_data(&cert); 1100 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1101 if (x == NULL) { 1102 al = SSL_AD_BAD_CERTIFICATE; 1103 SSLerror(s, ERR_R_ASN1_LIB); 1104 goto f_err; 1105 } 1106 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1107 al = SSL_AD_DECODE_ERROR; 1108 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1109 goto f_err; 1110 } 1111 if (!sk_X509_push(sk, x)) { 1112 SSLerror(s, ERR_R_MALLOC_FAILURE); 1113 goto err; 1114 } 1115 x = NULL; 1116 } 1117 1118 i = ssl_verify_cert_chain(s, sk); 1119 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1120 al = ssl_verify_alarm_type(s->verify_result); 1121 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1122 goto f_err; 1123 1124 } 1125 ERR_clear_error(); /* but we keep s->verify_result */ 1126 1127 sc = ssl_sess_cert_new(); 1128 if (sc == NULL) 1129 goto err; 1130 ssl_sess_cert_free(SSI(s)->sess_cert); 1131 SSI(s)->sess_cert = sc; 1132 1133 sc->cert_chain = sk; 1134 /* 1135 * Inconsistency alert: cert_chain does include the peer's 1136 * certificate, which we don't include in s3_srvr.c 1137 */ 1138 x = sk_X509_value(sk, 0); 1139 sk = NULL; 1140 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1141 1142 pkey = X509_get_pubkey(x); 1143 1144 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1145 x = NULL; 1146 al = SSL3_AL_FATAL; 1147 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1148 goto f_err; 1149 } 1150 1151 i = ssl_cert_type(x, pkey); 1152 if (i < 0) { 1153 x = NULL; 1154 al = SSL3_AL_FATAL; 1155 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1156 goto f_err; 1157 } 1158 1159 sc->peer_cert_type = i; 1160 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1161 /* 1162 * Why would the following ever happen? 1163 * We just created sc a couple of lines ago. 1164 */ 1165 X509_free(sc->peer_pkeys[i].x509); 1166 sc->peer_pkeys[i].x509 = x; 1167 sc->peer_key = &(sc->peer_pkeys[i]); 1168 1169 X509_free(s->session->peer); 1170 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1171 s->session->peer = x; 1172 s->session->verify_result = s->verify_result; 1173 1174 x = NULL; 1175 ret = 1; 1176 1177 if (0) { 1178 truncated: 1179 /* wrong packet length */ 1180 al = SSL_AD_DECODE_ERROR; 1181 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1182 f_err: 1183 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1184 } 1185 err: 1186 EVP_PKEY_free(pkey); 1187 X509_free(x); 1188 sk_X509_pop_free(sk, X509_free); 1189 1190 return (ret); 1191 } 1192 1193 static int 1194 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1195 { 1196 CBS dhp, dhg, dhpk; 1197 BN_CTX *bn_ctx = NULL; 1198 SESS_CERT *sc = NULL; 1199 DH *dh = NULL; 1200 long alg_a; 1201 int al; 1202 1203 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1204 sc = SSI(s)->sess_cert; 1205 1206 if ((dh = DH_new()) == NULL) { 1207 SSLerror(s, ERR_R_DH_LIB); 1208 goto err; 1209 } 1210 1211 if (!CBS_get_u16_length_prefixed(cbs, &dhp)) 1212 goto truncated; 1213 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1214 SSLerror(s, ERR_R_BN_LIB); 1215 goto err; 1216 } 1217 1218 if (!CBS_get_u16_length_prefixed(cbs, &dhg)) 1219 goto truncated; 1220 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1221 SSLerror(s, ERR_R_BN_LIB); 1222 goto err; 1223 } 1224 1225 if (!CBS_get_u16_length_prefixed(cbs, &dhpk)) 1226 goto truncated; 1227 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1228 NULL)) == NULL) { 1229 SSLerror(s, ERR_R_BN_LIB); 1230 goto err; 1231 } 1232 1233 /* 1234 * Check the strength of the DH key just constructed. 1235 * Discard keys weaker than 1024 bits. 1236 */ 1237 if (DH_size(dh) < 1024 / 8) { 1238 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1239 goto err; 1240 } 1241 1242 if (alg_a & SSL_aRSA) 1243 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1244 else 1245 /* XXX - Anonymous DH, so no certificate or pkey. */ 1246 *pkey = NULL; 1247 1248 sc->peer_dh_tmp = dh; 1249 1250 return (1); 1251 1252 truncated: 1253 al = SSL_AD_DECODE_ERROR; 1254 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1255 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1256 1257 err: 1258 DH_free(dh); 1259 BN_CTX_free(bn_ctx); 1260 1261 return (-1); 1262 } 1263 1264 static int 1265 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1266 { 1267 const EC_GROUP *group; 1268 EC_GROUP *ngroup = NULL; 1269 EC_POINT *point = NULL; 1270 BN_CTX *bn_ctx = NULL; 1271 EC_KEY *ecdh = NULL; 1272 int ret = -1; 1273 1274 /* 1275 * Extract the server's ephemeral ECDH public key. 1276 */ 1277 1278 if ((ecdh = EC_KEY_new()) == NULL) { 1279 SSLerror(s, ERR_R_MALLOC_FAILURE); 1280 goto err; 1281 } 1282 1283 if ((ngroup = EC_GROUP_new_by_curve_name(nid)) == NULL) { 1284 SSLerror(s, ERR_R_EC_LIB); 1285 goto err; 1286 } 1287 if (EC_KEY_set_group(ecdh, ngroup) == 0) { 1288 SSLerror(s, ERR_R_EC_LIB); 1289 goto err; 1290 } 1291 1292 group = EC_KEY_get0_group(ecdh); 1293 1294 if ((point = EC_POINT_new(group)) == NULL || 1295 (bn_ctx = BN_CTX_new()) == NULL) { 1296 SSLerror(s, ERR_R_MALLOC_FAILURE); 1297 goto err; 1298 } 1299 1300 if (EC_POINT_oct2point(group, point, CBS_data(public), 1301 CBS_len(public), bn_ctx) == 0) { 1302 SSLerror(s, SSL_R_BAD_ECPOINT); 1303 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1304 goto err; 1305 } 1306 1307 EC_KEY_set_public_key(ecdh, point); 1308 sc->peer_ecdh_tmp = ecdh; 1309 ecdh = NULL; 1310 1311 ret = 1; 1312 1313 err: 1314 BN_CTX_free(bn_ctx); 1315 EC_GROUP_free(ngroup); 1316 EC_POINT_free(point); 1317 EC_KEY_free(ecdh); 1318 1319 return (ret); 1320 } 1321 1322 static int 1323 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1324 { 1325 size_t outlen; 1326 1327 if (nid != NID_X25519) { 1328 SSLerror(s, ERR_R_INTERNAL_ERROR); 1329 goto err; 1330 } 1331 1332 if (CBS_len(public) != X25519_KEY_LENGTH) { 1333 SSLerror(s, SSL_R_BAD_ECPOINT); 1334 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1335 goto err; 1336 } 1337 1338 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1339 SSLerror(s, ERR_R_MALLOC_FAILURE); 1340 goto err; 1341 } 1342 1343 return (1); 1344 1345 err: 1346 return (-1); 1347 } 1348 1349 static int 1350 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1351 { 1352 CBS public; 1353 uint8_t curve_type; 1354 uint16_t curve_id; 1355 SESS_CERT *sc; 1356 long alg_a; 1357 int nid; 1358 int al; 1359 1360 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1361 sc = SSI(s)->sess_cert; 1362 1363 /* Only named curves are supported. */ 1364 if (!CBS_get_u8(cbs, &curve_type) || 1365 curve_type != NAMED_CURVE_TYPE || 1366 !CBS_get_u16(cbs, &curve_id)) { 1367 al = SSL_AD_DECODE_ERROR; 1368 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1369 goto f_err; 1370 } 1371 1372 /* 1373 * Check that the curve is one of our preferences - if it is not, 1374 * the server has sent us an invalid curve. 1375 */ 1376 if (tls1_check_curve(s, curve_id) != 1) { 1377 al = SSL_AD_DECODE_ERROR; 1378 SSLerror(s, SSL_R_WRONG_CURVE); 1379 goto f_err; 1380 } 1381 1382 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1383 al = SSL_AD_INTERNAL_ERROR; 1384 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1385 goto f_err; 1386 } 1387 1388 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1389 goto truncated; 1390 1391 if (nid == NID_X25519) { 1392 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1393 goto err; 1394 } else { 1395 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1396 goto err; 1397 } 1398 1399 /* 1400 * The ECC/TLS specification does not mention the use of DSA to sign 1401 * ECParameters in the server key exchange message. We do support RSA 1402 * and ECDSA. 1403 */ 1404 if (alg_a & SSL_aRSA) 1405 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1406 else if (alg_a & SSL_aECDSA) 1407 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1408 else 1409 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1410 *pkey = NULL; 1411 1412 return (1); 1413 1414 truncated: 1415 al = SSL_AD_DECODE_ERROR; 1416 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1417 1418 f_err: 1419 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1420 1421 err: 1422 return (-1); 1423 } 1424 1425 int 1426 ssl3_get_server_key_exchange(SSL *s) 1427 { 1428 CBS cbs, signature; 1429 const EVP_MD *md = NULL; 1430 EVP_PKEY *pkey = NULL; 1431 EVP_MD_CTX md_ctx; 1432 const unsigned char *param; 1433 long n, alg_k, alg_a; 1434 int al, ok; 1435 size_t param_len; 1436 1437 EVP_MD_CTX_init(&md_ctx); 1438 1439 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1440 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1441 1442 /* 1443 * Use same message size as in ssl3_get_certificate_request() 1444 * as ServerKeyExchange message may be skipped. 1445 */ 1446 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1447 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1448 if (!ok) 1449 return ((int)n); 1450 1451 if (n < 0) 1452 goto err; 1453 1454 CBS_init(&cbs, s->internal->init_msg, n); 1455 1456 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1457 /* 1458 * Do not skip server key exchange if this cipher suite uses 1459 * ephemeral keys. 1460 */ 1461 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1462 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1463 al = SSL_AD_UNEXPECTED_MESSAGE; 1464 goto f_err; 1465 } 1466 1467 S3I(s)->tmp.reuse_message = 1; 1468 EVP_MD_CTX_cleanup(&md_ctx); 1469 return (1); 1470 } 1471 1472 if (SSI(s)->sess_cert != NULL) { 1473 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1474 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1475 1476 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1477 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1478 1479 free(SSI(s)->sess_cert->peer_x25519_tmp); 1480 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1481 } else { 1482 SSI(s)->sess_cert = ssl_sess_cert_new(); 1483 if (SSI(s)->sess_cert == NULL) 1484 goto err; 1485 } 1486 1487 param = CBS_data(&cbs); 1488 param_len = CBS_len(&cbs); 1489 1490 if (alg_k & SSL_kDHE) { 1491 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1) 1492 goto err; 1493 } else if (alg_k & SSL_kECDHE) { 1494 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1) 1495 goto err; 1496 } else if (alg_k != 0) { 1497 al = SSL_AD_UNEXPECTED_MESSAGE; 1498 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1499 goto f_err; 1500 } 1501 1502 param_len -= CBS_len(&cbs); 1503 1504 /* if it was signed, check the signature */ 1505 if (pkey != NULL) { 1506 EVP_PKEY_CTX *pctx; 1507 const struct ssl_sigalg *sigalg; 1508 1509 if (SSL_USE_SIGALGS(s)) { 1510 uint16_t sigalg_value; 1511 1512 if (!CBS_get_u16(&cbs, &sigalg_value)) 1513 goto truncated; 1514 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, 1515 tls12_sigalgs_len)) == NULL) { 1516 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1517 al = SSL_AD_DECODE_ERROR; 1518 goto f_err; 1519 } 1520 if ((md = sigalg->md()) == NULL) { 1521 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1522 al = SSL_AD_DECODE_ERROR; 1523 goto f_err; 1524 } 1525 if (!ssl_sigalg_pkey_ok(sigalg, pkey)) { 1526 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 1527 al = SSL_AD_DECODE_ERROR; 1528 goto f_err; 1529 } 1530 } else if (pkey->type == EVP_PKEY_RSA) { 1531 sigalg = ssl_sigalg_lookup(SIGALG_RSA_PKCS1_MD5_SHA1); 1532 } else if (pkey->type == EVP_PKEY_EC) { 1533 sigalg = ssl_sigalg_lookup(SIGALG_ECDSA_SHA1); 1534 } else { 1535 SSLerror(s, SSL_R_UNKNOWN_PKEY_TYPE); 1536 al = SSL_AD_DECODE_ERROR; 1537 goto f_err; 1538 } 1539 md = sigalg->md(); 1540 1541 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1542 goto truncated; 1543 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1544 al = SSL_AD_DECODE_ERROR; 1545 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1546 goto f_err; 1547 } 1548 1549 if (!EVP_DigestVerifyInit(&md_ctx, &pctx, md, NULL, pkey)) 1550 goto err; 1551 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->client_random, 1552 SSL3_RANDOM_SIZE)) 1553 goto err; 1554 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1555 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1556 RSA_PKCS1_PSS_PADDING) || 1557 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1558 goto err; 1559 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->server_random, 1560 SSL3_RANDOM_SIZE)) 1561 goto err; 1562 if (!EVP_DigestVerifyUpdate(&md_ctx, param, param_len)) 1563 goto err; 1564 if (EVP_DigestVerifyFinal(&md_ctx, CBS_data(&signature), 1565 CBS_len(&signature)) <= 0) { 1566 al = SSL_AD_DECRYPT_ERROR; 1567 SSLerror(s, SSL_R_BAD_SIGNATURE); 1568 goto f_err; 1569 } 1570 } else { 1571 /* aNULL does not need public keys. */ 1572 if (!(alg_a & SSL_aNULL)) { 1573 SSLerror(s, ERR_R_INTERNAL_ERROR); 1574 goto err; 1575 } 1576 } 1577 1578 if (CBS_len(&cbs) != 0) { 1579 al = SSL_AD_DECODE_ERROR; 1580 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1581 goto f_err; 1582 } 1583 1584 EVP_PKEY_free(pkey); 1585 EVP_MD_CTX_cleanup(&md_ctx); 1586 1587 return (1); 1588 1589 truncated: 1590 al = SSL_AD_DECODE_ERROR; 1591 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1592 1593 f_err: 1594 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1595 1596 err: 1597 EVP_PKEY_free(pkey); 1598 EVP_MD_CTX_cleanup(&md_ctx); 1599 1600 return (-1); 1601 } 1602 1603 int 1604 ssl3_get_certificate_request(SSL *s) 1605 { 1606 int ok, ret = 0; 1607 long n; 1608 uint8_t ctype_num; 1609 CBS cert_request, ctypes, rdn_list; 1610 X509_NAME *xn = NULL; 1611 const unsigned char *q; 1612 STACK_OF(X509_NAME) *ca_sk = NULL; 1613 1614 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1615 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1616 1617 if (!ok) 1618 return ((int)n); 1619 1620 S3I(s)->tmp.cert_req = 0; 1621 1622 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_DONE) { 1623 S3I(s)->tmp.reuse_message = 1; 1624 /* 1625 * If we get here we don't need any cached handshake records 1626 * as we wont be doing client auth. 1627 */ 1628 tls1_transcript_free(s); 1629 return (1); 1630 } 1631 1632 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1633 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1634 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1635 goto err; 1636 } 1637 1638 /* TLS does not like anon-DH with client cert */ 1639 if (S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL) { 1640 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1641 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1642 goto err; 1643 } 1644 1645 if (n < 0) 1646 goto truncated; 1647 CBS_init(&cert_request, s->internal->init_msg, n); 1648 1649 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1650 SSLerror(s, ERR_R_MALLOC_FAILURE); 1651 goto err; 1652 } 1653 1654 /* get the certificate types */ 1655 if (!CBS_get_u8(&cert_request, &ctype_num)) 1656 goto truncated; 1657 1658 if (ctype_num > SSL3_CT_NUMBER) 1659 ctype_num = SSL3_CT_NUMBER; 1660 if (!CBS_get_bytes(&cert_request, &ctypes, ctype_num) || 1661 !CBS_write_bytes(&ctypes, (uint8_t *)S3I(s)->tmp.ctype, 1662 sizeof(S3I(s)->tmp.ctype), NULL)) { 1663 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1664 goto err; 1665 } 1666 1667 if (SSL_USE_SIGALGS(s)) { 1668 CBS sigalgs; 1669 1670 if (CBS_len(&cert_request) < 2) { 1671 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1672 goto err; 1673 } 1674 1675 /* Check we have enough room for signature algorithms and 1676 * following length value. 1677 */ 1678 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1679 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1680 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1681 goto err; 1682 } 1683 if (!tls1_process_sigalgs(s, &sigalgs, tls12_sigalgs, 1684 tls12_sigalgs_len)) { 1685 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1686 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1687 goto err; 1688 } 1689 } 1690 1691 /* get the CA RDNs */ 1692 if (CBS_len(&cert_request) < 2) { 1693 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1694 goto err; 1695 } 1696 1697 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1698 CBS_len(&cert_request) != 0) { 1699 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1700 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1701 goto err; 1702 } 1703 1704 while (CBS_len(&rdn_list) > 0) { 1705 CBS rdn; 1706 1707 if (CBS_len(&rdn_list) < 2) { 1708 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1709 goto err; 1710 } 1711 1712 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1713 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1714 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1715 goto err; 1716 } 1717 1718 q = CBS_data(&rdn); 1719 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1720 ssl3_send_alert(s, SSL3_AL_FATAL, 1721 SSL_AD_DECODE_ERROR); 1722 SSLerror(s, ERR_R_ASN1_LIB); 1723 goto err; 1724 } 1725 1726 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1727 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1728 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1729 goto err; 1730 } 1731 if (!sk_X509_NAME_push(ca_sk, xn)) { 1732 SSLerror(s, ERR_R_MALLOC_FAILURE); 1733 goto err; 1734 } 1735 xn = NULL; /* avoid free in err block */ 1736 } 1737 1738 /* we should setup a certificate to return.... */ 1739 S3I(s)->tmp.cert_req = 1; 1740 S3I(s)->tmp.ctype_num = ctype_num; 1741 sk_X509_NAME_pop_free(S3I(s)->tmp.ca_names, X509_NAME_free); 1742 S3I(s)->tmp.ca_names = ca_sk; 1743 ca_sk = NULL; 1744 1745 ret = 1; 1746 if (0) { 1747 truncated: 1748 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1749 } 1750 err: 1751 X509_NAME_free(xn); 1752 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1753 return (ret); 1754 } 1755 1756 static int 1757 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1758 { 1759 return (X509_NAME_cmp(*a, *b)); 1760 } 1761 1762 int 1763 ssl3_get_new_session_ticket(SSL *s) 1764 { 1765 int ok, al, ret = 0; 1766 uint32_t lifetime_hint; 1767 long n; 1768 CBS cbs, session_ticket; 1769 1770 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1771 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1772 if (!ok) 1773 return ((int)n); 1774 1775 if (S3I(s)->tmp.message_type == SSL3_MT_FINISHED) { 1776 S3I(s)->tmp.reuse_message = 1; 1777 return (1); 1778 } 1779 if (S3I(s)->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) { 1780 al = SSL_AD_UNEXPECTED_MESSAGE; 1781 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1782 goto f_err; 1783 } 1784 1785 if (n < 0) { 1786 al = SSL_AD_DECODE_ERROR; 1787 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1788 goto f_err; 1789 } 1790 1791 CBS_init(&cbs, s->internal->init_msg, n); 1792 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1793 #if UINT32_MAX > LONG_MAX 1794 lifetime_hint > LONG_MAX || 1795 #endif 1796 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1797 CBS_len(&cbs) != 0) { 1798 al = SSL_AD_DECODE_ERROR; 1799 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1800 goto f_err; 1801 } 1802 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1803 1804 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1805 &s->session->tlsext_ticklen)) { 1806 SSLerror(s, ERR_R_MALLOC_FAILURE); 1807 goto err; 1808 } 1809 1810 /* 1811 * There are two ways to detect a resumed ticket sesion. 1812 * One is to set an appropriate session ID and then the server 1813 * must return a match in ServerHello. This allows the normal 1814 * client session ID matching to work and we know much 1815 * earlier that the ticket has been accepted. 1816 * 1817 * The other way is to set zero length session ID when the 1818 * ticket is presented and rely on the handshake to determine 1819 * session resumption. 1820 * 1821 * We choose the former approach because this fits in with 1822 * assumptions elsewhere in OpenSSL. The session ID is set 1823 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1824 * ticket. 1825 */ 1826 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1827 s->session->session_id, &s->session->session_id_length, 1828 EVP_sha256(), NULL); 1829 ret = 1; 1830 return (ret); 1831 f_err: 1832 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1833 err: 1834 return (-1); 1835 } 1836 1837 int 1838 ssl3_get_cert_status(SSL *s) 1839 { 1840 CBS cert_status, response; 1841 size_t stow_len; 1842 int ok, al; 1843 long n; 1844 uint8_t status_type; 1845 1846 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1847 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 1848 16384, &ok); 1849 1850 if (!ok) 1851 return ((int)n); 1852 1853 if (n < 0) { 1854 /* need at least status type + length */ 1855 al = SSL_AD_DECODE_ERROR; 1856 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1857 goto f_err; 1858 } 1859 1860 CBS_init(&cert_status, s->internal->init_msg, n); 1861 if (!CBS_get_u8(&cert_status, &status_type) || 1862 CBS_len(&cert_status) < 3) { 1863 /* need at least status type + length */ 1864 al = SSL_AD_DECODE_ERROR; 1865 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1866 goto f_err; 1867 } 1868 1869 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1870 al = SSL_AD_DECODE_ERROR; 1871 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1872 goto f_err; 1873 } 1874 1875 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1876 CBS_len(&cert_status) != 0) { 1877 al = SSL_AD_DECODE_ERROR; 1878 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1879 goto f_err; 1880 } 1881 1882 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1883 &stow_len) || stow_len > INT_MAX) { 1884 s->internal->tlsext_ocsp_resplen = 0; 1885 al = SSL_AD_INTERNAL_ERROR; 1886 SSLerror(s, ERR_R_MALLOC_FAILURE); 1887 goto f_err; 1888 } 1889 s->internal->tlsext_ocsp_resplen = (int)stow_len; 1890 1891 if (s->ctx->internal->tlsext_status_cb) { 1892 int ret; 1893 ret = s->ctx->internal->tlsext_status_cb(s, 1894 s->ctx->internal->tlsext_status_arg); 1895 if (ret == 0) { 1896 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1897 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1898 goto f_err; 1899 } 1900 if (ret < 0) { 1901 al = SSL_AD_INTERNAL_ERROR; 1902 SSLerror(s, ERR_R_MALLOC_FAILURE); 1903 goto f_err; 1904 } 1905 } 1906 return (1); 1907 f_err: 1908 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1909 return (-1); 1910 } 1911 1912 int 1913 ssl3_get_server_done(SSL *s) 1914 { 1915 int ok, ret = 0; 1916 long n; 1917 1918 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1919 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1920 30, /* should be very small, like 0 :-) */ &ok); 1921 1922 if (!ok) 1923 return ((int)n); 1924 if (n > 0) { 1925 /* should contain no data */ 1926 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1927 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1928 return (-1); 1929 } 1930 ret = 1; 1931 return (ret); 1932 } 1933 1934 static int 1935 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1936 { 1937 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1938 unsigned char *enc_pms = NULL; 1939 EVP_PKEY *pkey = NULL; 1940 int ret = -1; 1941 int enc_len; 1942 CBB epms; 1943 1944 /* 1945 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1946 */ 1947 1948 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1949 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1950 pkey->pkey.rsa == NULL) { 1951 SSLerror(s, ERR_R_INTERNAL_ERROR); 1952 goto err; 1953 } 1954 1955 pms[0] = s->client_version >> 8; 1956 pms[1] = s->client_version & 0xff; 1957 arc4random_buf(&pms[2], sizeof(pms) - 2); 1958 1959 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1960 SSLerror(s, ERR_R_MALLOC_FAILURE); 1961 goto err; 1962 } 1963 1964 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 1965 RSA_PKCS1_PADDING); 1966 if (enc_len <= 0) { 1967 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1968 goto err; 1969 } 1970 1971 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1972 goto err; 1973 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 1974 goto err; 1975 if (!CBB_flush(cbb)) 1976 goto err; 1977 1978 s->session->master_key_length = 1979 tls1_generate_master_secret(s, 1980 s->session->master_key, pms, sizeof(pms)); 1981 1982 ret = 1; 1983 1984 err: 1985 explicit_bzero(pms, sizeof(pms)); 1986 EVP_PKEY_free(pkey); 1987 free(enc_pms); 1988 1989 return (ret); 1990 } 1991 1992 static int 1993 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1994 { 1995 DH *dh_srvr = NULL, *dh_clnt = NULL; 1996 unsigned char *key = NULL; 1997 int key_size = 0, key_len; 1998 unsigned char *data; 1999 int ret = -1; 2000 CBB dh_Yc; 2001 2002 /* Ensure that we have an ephemeral key for DHE. */ 2003 if (sess_cert->peer_dh_tmp == NULL) { 2004 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2005 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 2006 goto err; 2007 } 2008 dh_srvr = sess_cert->peer_dh_tmp; 2009 2010 /* Generate a new random key. */ 2011 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2012 SSLerror(s, ERR_R_DH_LIB); 2013 goto err; 2014 } 2015 if (!DH_generate_key(dh_clnt)) { 2016 SSLerror(s, ERR_R_DH_LIB); 2017 goto err; 2018 } 2019 if ((key_size = DH_size(dh_clnt)) <= 0) { 2020 SSLerror(s, ERR_R_DH_LIB); 2021 goto err; 2022 } 2023 if ((key = malloc(key_size)) == NULL) { 2024 SSLerror(s, ERR_R_MALLOC_FAILURE); 2025 goto err; 2026 } 2027 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) { 2028 SSLerror(s, ERR_R_DH_LIB); 2029 goto err; 2030 } 2031 2032 /* Generate master key from the result. */ 2033 s->session->master_key_length = 2034 tls1_generate_master_secret(s, 2035 s->session->master_key, key, key_len); 2036 2037 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2038 goto err; 2039 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2040 goto err; 2041 BN_bn2bin(dh_clnt->pub_key, data); 2042 if (!CBB_flush(cbb)) 2043 goto err; 2044 2045 ret = 1; 2046 2047 err: 2048 DH_free(dh_clnt); 2049 freezero(key, key_size); 2050 2051 return (ret); 2052 } 2053 2054 static int 2055 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2056 { 2057 const EC_GROUP *group = NULL; 2058 const EC_POINT *point = NULL; 2059 EC_KEY *ecdh = NULL; 2060 BN_CTX *bn_ctx = NULL; 2061 unsigned char *key = NULL; 2062 unsigned char *data; 2063 size_t encoded_len; 2064 int key_size = 0, key_len; 2065 int ret = -1; 2066 CBB ecpoint; 2067 2068 if ((group = EC_KEY_get0_group(sc->peer_ecdh_tmp)) == NULL || 2069 (point = EC_KEY_get0_public_key(sc->peer_ecdh_tmp)) == NULL) { 2070 SSLerror(s, ERR_R_INTERNAL_ERROR); 2071 goto err; 2072 } 2073 2074 if ((ecdh = EC_KEY_new()) == NULL) { 2075 SSLerror(s, ERR_R_MALLOC_FAILURE); 2076 goto err; 2077 } 2078 2079 if (!EC_KEY_set_group(ecdh, group)) { 2080 SSLerror(s, ERR_R_EC_LIB); 2081 goto err; 2082 } 2083 2084 /* Generate a new ECDH key pair. */ 2085 if (!EC_KEY_generate_key(ecdh)) { 2086 SSLerror(s, ERR_R_ECDH_LIB); 2087 goto err; 2088 } 2089 if ((key_size = ECDH_size(ecdh)) <= 0) { 2090 SSLerror(s, ERR_R_ECDH_LIB); 2091 goto err; 2092 } 2093 if ((key = malloc(key_size)) == NULL) { 2094 SSLerror(s, ERR_R_MALLOC_FAILURE); 2095 goto err; 2096 } 2097 key_len = ECDH_compute_key(key, key_size, point, ecdh, NULL); 2098 if (key_len <= 0) { 2099 SSLerror(s, ERR_R_ECDH_LIB); 2100 goto err; 2101 } 2102 2103 /* Generate master key from the result. */ 2104 s->session->master_key_length = 2105 tls1_generate_master_secret(s, 2106 s->session->master_key, key, key_len); 2107 2108 encoded_len = EC_POINT_point2oct(group, EC_KEY_get0_public_key(ecdh), 2109 POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL); 2110 if (encoded_len == 0) { 2111 SSLerror(s, ERR_R_ECDH_LIB); 2112 goto err; 2113 } 2114 2115 if ((bn_ctx = BN_CTX_new()) == NULL) { 2116 SSLerror(s, ERR_R_MALLOC_FAILURE); 2117 goto err; 2118 } 2119 2120 /* Encode the public key. */ 2121 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2122 goto err; 2123 if (!CBB_add_space(&ecpoint, &data, encoded_len)) 2124 goto err; 2125 if (EC_POINT_point2oct(group, EC_KEY_get0_public_key(ecdh), 2126 POINT_CONVERSION_UNCOMPRESSED, data, encoded_len, 2127 bn_ctx) == 0) 2128 goto err; 2129 if (!CBB_flush(cbb)) 2130 goto err; 2131 2132 ret = 1; 2133 2134 err: 2135 freezero(key, key_size); 2136 2137 BN_CTX_free(bn_ctx); 2138 EC_KEY_free(ecdh); 2139 2140 return (ret); 2141 } 2142 2143 static int 2144 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2145 { 2146 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2147 int ret = -1; 2148 CBB ecpoint; 2149 2150 /* Generate X25519 key pair and derive shared key. */ 2151 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2152 goto err; 2153 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2154 goto err; 2155 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2156 goto err; 2157 X25519_keypair(public_key, private_key); 2158 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2159 goto err; 2160 2161 /* Serialize the public key. */ 2162 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2163 goto err; 2164 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2165 goto err; 2166 if (!CBB_flush(cbb)) 2167 goto err; 2168 2169 /* Generate master key from the result. */ 2170 s->session->master_key_length = 2171 tls1_generate_master_secret(s, 2172 s->session->master_key, shared_key, X25519_KEY_LENGTH); 2173 2174 ret = 1; 2175 2176 err: 2177 free(public_key); 2178 freezero(private_key, X25519_KEY_LENGTH); 2179 freezero(shared_key, X25519_KEY_LENGTH); 2180 2181 return (ret); 2182 } 2183 2184 static int 2185 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2186 { 2187 if (sc->peer_x25519_tmp != NULL) { 2188 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2189 goto err; 2190 } else if (sc->peer_ecdh_tmp != NULL) { 2191 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2192 goto err; 2193 } else { 2194 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2195 SSLerror(s, ERR_R_INTERNAL_ERROR); 2196 goto err; 2197 } 2198 2199 return (1); 2200 2201 err: 2202 return (-1); 2203 } 2204 2205 static int 2206 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2207 { 2208 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2209 EVP_PKEY *pub_key = NULL; 2210 EVP_PKEY_CTX *pkey_ctx; 2211 X509 *peer_cert; 2212 size_t msglen; 2213 unsigned int md_len; 2214 EVP_MD_CTX *ukm_hash; 2215 int ret = -1; 2216 int nid; 2217 CBB gostblob; 2218 2219 /* Get server sertificate PKEY and create ctx from it */ 2220 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2221 if (peer_cert == NULL) { 2222 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2223 goto err; 2224 } 2225 2226 pub_key = X509_get_pubkey(peer_cert); 2227 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2228 2229 /* 2230 * If we have send a certificate, and certificate key parameters match 2231 * those of server certificate, use certificate key for key exchange. 2232 * Otherwise, generate ephemeral key pair. 2233 */ 2234 EVP_PKEY_encrypt_init(pkey_ctx); 2235 2236 /* Generate session key. */ 2237 arc4random_buf(premaster_secret, 32); 2238 2239 /* 2240 * If we have client certificate, use its secret as peer key. 2241 */ 2242 if (S3I(s)->tmp.cert_req && s->cert->key->privatekey) { 2243 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2244 s->cert->key->privatekey) <=0) { 2245 /* 2246 * If there was an error - just ignore it. 2247 * Ephemeral key would be used. 2248 */ 2249 ERR_clear_error(); 2250 } 2251 } 2252 2253 /* 2254 * Compute shared IV and store it in algorithm-specific context data. 2255 */ 2256 ukm_hash = EVP_MD_CTX_new(); 2257 if (ukm_hash == NULL) { 2258 SSLerror(s, ERR_R_MALLOC_FAILURE); 2259 goto err; 2260 } 2261 2262 if (ssl_get_algorithm2(s) & SSL_HANDSHAKE_MAC_GOST94) 2263 nid = NID_id_GostR3411_94; 2264 else 2265 nid = NID_id_tc26_gost3411_2012_256; 2266 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2267 goto err; 2268 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2269 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2270 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2271 EVP_MD_CTX_free(ukm_hash); 2272 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2273 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2274 SSLerror(s, SSL_R_LIBRARY_BUG); 2275 goto err; 2276 } 2277 2278 /* 2279 * Make GOST keytransport blob message, encapsulate it into sequence. 2280 */ 2281 msglen = 255; 2282 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2283 32) < 0) { 2284 SSLerror(s, SSL_R_LIBRARY_BUG); 2285 goto err; 2286 } 2287 2288 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2289 goto err; 2290 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2291 goto err; 2292 if (!CBB_flush(cbb)) 2293 goto err; 2294 2295 /* Check if pubkey from client certificate was used. */ 2296 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2297 NULL) > 0) { 2298 /* Set flag "skip certificate verify". */ 2299 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2300 } 2301 EVP_PKEY_CTX_free(pkey_ctx); 2302 s->session->master_key_length = 2303 tls1_generate_master_secret(s, 2304 s->session->master_key, premaster_secret, 32); 2305 2306 ret = 1; 2307 2308 err: 2309 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2310 EVP_PKEY_free(pub_key); 2311 2312 return (ret); 2313 } 2314 2315 int 2316 ssl3_send_client_key_exchange(SSL *s) 2317 { 2318 SESS_CERT *sess_cert; 2319 unsigned long alg_k; 2320 CBB cbb, kex; 2321 2322 memset(&cbb, 0, sizeof(cbb)); 2323 2324 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2325 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2326 2327 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2328 ssl3_send_alert(s, SSL3_AL_FATAL, 2329 SSL_AD_UNEXPECTED_MESSAGE); 2330 SSLerror(s, ERR_R_INTERNAL_ERROR); 2331 goto err; 2332 } 2333 2334 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2335 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2336 goto err; 2337 2338 if (alg_k & SSL_kRSA) { 2339 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2340 goto err; 2341 } else if (alg_k & SSL_kDHE) { 2342 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2343 goto err; 2344 } else if (alg_k & SSL_kECDHE) { 2345 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2346 goto err; 2347 } else if (alg_k & SSL_kGOST) { 2348 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2349 goto err; 2350 } else { 2351 ssl3_send_alert(s, SSL3_AL_FATAL, 2352 SSL_AD_HANDSHAKE_FAILURE); 2353 SSLerror(s, ERR_R_INTERNAL_ERROR); 2354 goto err; 2355 } 2356 2357 if (!ssl3_handshake_msg_finish(s, &cbb)) 2358 goto err; 2359 2360 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2361 } 2362 2363 /* SSL3_ST_CW_KEY_EXCH_B */ 2364 return (ssl3_handshake_write(s)); 2365 2366 err: 2367 CBB_cleanup(&cbb); 2368 2369 return (-1); 2370 } 2371 2372 static int 2373 ssl3_send_client_verify_sigalgs(SSL *s, CBB *cert_verify) 2374 { 2375 CBB cbb_signature; 2376 EVP_PKEY_CTX *pctx = NULL; 2377 EVP_PKEY *pkey; 2378 EVP_MD_CTX mctx; 2379 const EVP_MD *md; 2380 const unsigned char *hdata; 2381 unsigned char *signature = NULL; 2382 unsigned int signature_len = 0; 2383 size_t hdatalen; 2384 size_t siglen; 2385 int ret = 0; 2386 2387 EVP_MD_CTX_init(&mctx); 2388 2389 pkey = s->cert->key->privatekey; 2390 md = s->cert->key->sigalg->md(); 2391 2392 if (!tls1_transcript_data(s, &hdata, &hdatalen) || 2393 !CBB_add_u16(cert_verify, s->cert->key->sigalg->value)) { 2394 SSLerror(s, ERR_R_INTERNAL_ERROR); 2395 goto err; 2396 } 2397 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2398 SSLerror(s, ERR_R_EVP_LIB); 2399 goto err; 2400 } 2401 if ((s->cert->key->sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2402 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2403 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2404 SSLerror(s, ERR_R_EVP_LIB); 2405 goto err; 2406 } 2407 if (!EVP_DigestSignUpdate(&mctx, hdata, hdatalen)) { 2408 SSLerror(s, ERR_R_EVP_LIB); 2409 goto err; 2410 } 2411 if (!EVP_DigestSignFinal(&mctx, NULL, &siglen) || siglen == 0) { 2412 SSLerror(s, ERR_R_EVP_LIB); 2413 goto err; 2414 } 2415 if ((signature = calloc(1, siglen)) == NULL) { 2416 SSLerror(s, ERR_R_MALLOC_FAILURE); 2417 goto err; 2418 } 2419 if (!EVP_DigestSignFinal(&mctx, signature, &siglen)) { 2420 SSLerror(s, ERR_R_EVP_LIB); 2421 goto err; 2422 } 2423 signature_len = siglen; /* XXX */ 2424 2425 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2426 goto err; 2427 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2428 goto err; 2429 if (!CBB_flush(cert_verify)) 2430 goto err; 2431 2432 ret = 1; 2433 err: 2434 EVP_MD_CTX_cleanup(&mctx); 2435 free(signature); 2436 return ret; 2437 } 2438 2439 static int 2440 ssl3_send_client_verify_rsa(SSL *s, CBB *cert_verify) 2441 { 2442 CBB cbb_signature; 2443 EVP_PKEY *pkey; 2444 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; 2445 unsigned char *signature = NULL; 2446 unsigned int signature_len = 0; 2447 int ret = 0; 2448 2449 if (!tls1_handshake_hash_value(s, data, sizeof(data), NULL)) 2450 goto err; 2451 2452 pkey = s->cert->key->privatekey; 2453 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2454 goto err; 2455 if (RSA_sign(NID_md5_sha1, data, MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, 2456 signature, &signature_len, pkey->pkey.rsa) <= 0 ) { 2457 SSLerror(s, ERR_R_RSA_LIB); 2458 goto err; 2459 } 2460 2461 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2462 goto err; 2463 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2464 goto err; 2465 if (!CBB_flush(cert_verify)) 2466 goto err; 2467 2468 ret = 1; 2469 err: 2470 free(signature); 2471 return ret; 2472 } 2473 2474 static int 2475 ssl3_send_client_verify_ec(SSL *s, CBB *cert_verify) 2476 { 2477 CBB cbb_signature; 2478 EVP_PKEY *pkey; 2479 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; 2480 unsigned char *signature = NULL; 2481 unsigned int signature_len = 0; 2482 int ret = 0; 2483 2484 if (!tls1_handshake_hash_value(s, data, sizeof(data), NULL)) 2485 goto err; 2486 2487 pkey = s->cert->key->privatekey; 2488 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2489 goto err; 2490 if (!ECDSA_sign(pkey->save_type, &data[MD5_DIGEST_LENGTH], 2491 SHA_DIGEST_LENGTH, signature, &signature_len, pkey->pkey.ec)) { 2492 SSLerror(s, ERR_R_ECDSA_LIB); 2493 goto err; 2494 } 2495 2496 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2497 goto err; 2498 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2499 goto err; 2500 if (!CBB_flush(cert_verify)) 2501 goto err; 2502 2503 ret = 1; 2504 err: 2505 free(signature); 2506 return ret; 2507 } 2508 2509 #ifndef OPENSSL_NO_GOST 2510 static int 2511 ssl3_send_client_verify_gost(SSL *s, CBB *cert_verify) 2512 { 2513 CBB cbb_signature; 2514 EVP_MD_CTX mctx; 2515 EVP_PKEY_CTX *pctx; 2516 EVP_PKEY *pkey; 2517 const EVP_MD *md; 2518 const unsigned char *hdata; 2519 unsigned char signbuf[128]; 2520 unsigned char *signature = NULL; 2521 unsigned int signature_len = 0; 2522 unsigned int u; 2523 size_t hdatalen; 2524 size_t sigsize; 2525 int nid; 2526 int ret = 0; 2527 2528 EVP_MD_CTX_init(&mctx); 2529 2530 pkey = s->cert->key->privatekey; 2531 2532 /* Create context from key and test if sha1 is allowed as digest. */ 2533 if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) 2534 goto err; 2535 if (EVP_PKEY_sign_init(pctx) <= 0) 2536 goto err; 2537 /* XXX - is this needed? */ 2538 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1()) <= 0) 2539 ERR_clear_error(); 2540 2541 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2542 SSLerror(s, ERR_R_INTERNAL_ERROR); 2543 goto err; 2544 } 2545 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2546 !(md = EVP_get_digestbynid(nid))) { 2547 SSLerror(s, ERR_R_EVP_LIB); 2548 goto err; 2549 } 2550 if (!EVP_DigestInit_ex(&mctx, md, NULL) || 2551 !EVP_DigestUpdate(&mctx, hdata, hdatalen) || 2552 !EVP_DigestFinal(&mctx, signbuf, &u) || 2553 2554 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) || 2555 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2556 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, 2557 NULL) <= 0) || 2558 (EVP_PKEY_sign(pctx, signature, &sigsize, signbuf, u) <= 0)) { 2559 SSLerror(s, ERR_R_EVP_LIB); 2560 goto err; 2561 } 2562 if (sigsize > UINT_MAX) 2563 goto err; 2564 signature_len = sigsize; 2565 2566 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2567 goto err; 2568 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2569 goto err; 2570 if (!CBB_flush(cert_verify)) 2571 goto err; 2572 2573 ret = 1; 2574 err: 2575 EVP_MD_CTX_cleanup(&mctx); 2576 EVP_PKEY_CTX_free(pctx); 2577 free(signature); 2578 return ret; 2579 } 2580 #endif 2581 2582 int 2583 ssl3_send_client_verify(SSL *s) 2584 { 2585 CBB cbb, cert_verify; 2586 EVP_PKEY *pkey; 2587 2588 memset(&cbb, 0, sizeof(cbb)); 2589 2590 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2591 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2592 SSL3_MT_CERTIFICATE_VERIFY)) 2593 goto err; 2594 2595 pkey = s->cert->key->privatekey; 2596 2597 /* 2598 * For TLS v1.2 send signature algorithm and signature 2599 * using agreed digest and cached handshake records. 2600 */ 2601 if (SSL_USE_SIGALGS(s)) { 2602 if (!ssl3_send_client_verify_sigalgs(s, &cert_verify)) 2603 goto err; 2604 } else if (pkey->type == EVP_PKEY_RSA) { 2605 if (!ssl3_send_client_verify_rsa(s, &cert_verify)) 2606 goto err; 2607 } else if (pkey->type == EVP_PKEY_EC) { 2608 if (!ssl3_send_client_verify_ec(s, &cert_verify)) 2609 goto err; 2610 #ifndef OPENSSL_NO_GOST 2611 } else if (pkey->type == NID_id_GostR3410_94 || 2612 pkey->type == NID_id_GostR3410_2001) { 2613 if (!ssl3_send_client_verify_gost(s, &cert_verify)) 2614 goto err; 2615 #endif 2616 } else { 2617 SSLerror(s, ERR_R_INTERNAL_ERROR); 2618 goto err; 2619 } 2620 2621 tls1_transcript_free(s); 2622 2623 if (!ssl3_handshake_msg_finish(s, &cbb)) 2624 goto err; 2625 2626 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2627 } 2628 2629 return (ssl3_handshake_write(s)); 2630 2631 err: 2632 CBB_cleanup(&cbb); 2633 2634 return (-1); 2635 } 2636 2637 int 2638 ssl3_send_client_certificate(SSL *s) 2639 { 2640 EVP_PKEY *pkey = NULL; 2641 X509 *x509 = NULL; 2642 CBB cbb, client_cert; 2643 int i; 2644 2645 memset(&cbb, 0, sizeof(cbb)); 2646 2647 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2648 if (s->cert->key->x509 == NULL || 2649 s->cert->key->privatekey == NULL) 2650 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2651 else 2652 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2653 } 2654 2655 /* We need to get a client cert */ 2656 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2657 /* 2658 * If we get an error, we need to 2659 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 2660 * We then get retied later 2661 */ 2662 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2663 if (i < 0) { 2664 s->internal->rwstate = SSL_X509_LOOKUP; 2665 return (-1); 2666 } 2667 s->internal->rwstate = SSL_NOTHING; 2668 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2669 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2670 if (!SSL_use_certificate(s, x509) || 2671 !SSL_use_PrivateKey(s, pkey)) 2672 i = 0; 2673 } else if (i == 1) { 2674 i = 0; 2675 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2676 } 2677 2678 X509_free(x509); 2679 EVP_PKEY_free(pkey); 2680 if (i == 0) { 2681 S3I(s)->tmp.cert_req = 2; 2682 2683 /* There is no client certificate to verify. */ 2684 tls1_transcript_free(s); 2685 } 2686 2687 /* Ok, we have a cert */ 2688 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2689 } 2690 2691 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2692 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2693 SSL3_MT_CERTIFICATE)) 2694 goto err; 2695 if (!ssl3_output_cert_chain(s, &client_cert, 2696 (S3I(s)->tmp.cert_req == 2) ? NULL : s->cert->key->x509)) 2697 goto err; 2698 if (!ssl3_handshake_msg_finish(s, &cbb)) 2699 goto err; 2700 2701 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2702 } 2703 2704 /* SSL3_ST_CW_CERT_D */ 2705 return (ssl3_handshake_write(s)); 2706 2707 err: 2708 CBB_cleanup(&cbb); 2709 2710 return (0); 2711 } 2712 2713 #define has_bits(i,m) (((i)&(m)) == (m)) 2714 2715 int 2716 ssl3_check_cert_and_algorithm(SSL *s) 2717 { 2718 int i, idx; 2719 long alg_k, alg_a; 2720 EVP_PKEY *pkey = NULL; 2721 SESS_CERT *sc; 2722 DH *dh; 2723 2724 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2725 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 2726 2727 /* We don't have a certificate. */ 2728 if (alg_a & SSL_aNULL) 2729 return (1); 2730 2731 sc = SSI(s)->sess_cert; 2732 if (sc == NULL) { 2733 SSLerror(s, ERR_R_INTERNAL_ERROR); 2734 goto err; 2735 } 2736 dh = SSI(s)->sess_cert->peer_dh_tmp; 2737 2738 /* This is the passed certificate. */ 2739 2740 idx = sc->peer_cert_type; 2741 if (idx == SSL_PKEY_ECC) { 2742 if (ssl_check_srvr_ecc_cert_and_alg( 2743 sc->peer_pkeys[idx].x509, s) == 0) { 2744 /* check failed */ 2745 SSLerror(s, SSL_R_BAD_ECC_CERT); 2746 goto f_err; 2747 } else { 2748 return (1); 2749 } 2750 } 2751 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2752 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2753 EVP_PKEY_free(pkey); 2754 2755 /* Check that we have a certificate if we require one. */ 2756 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2757 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2758 goto f_err; 2759 } 2760 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2761 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2762 goto f_err; 2763 } 2764 if ((alg_k & SSL_kDHE) && 2765 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2766 SSLerror(s, SSL_R_MISSING_DH_KEY); 2767 goto f_err; 2768 } 2769 2770 return (1); 2771 f_err: 2772 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2773 err: 2774 return (0); 2775 } 2776 2777 /* 2778 * Check to see if handshake is full or resumed. Usually this is just a 2779 * case of checking to see if a cache hit has occurred. In the case of 2780 * session tickets we have to check the next message to be sure. 2781 */ 2782 2783 int 2784 ssl3_check_finished(SSL *s) 2785 { 2786 int ok; 2787 long n; 2788 2789 /* If we have no ticket it cannot be a resumed session. */ 2790 if (!s->session->tlsext_tick) 2791 return (1); 2792 /* this function is called when we really expect a Certificate 2793 * message, so permit appropriate message length */ 2794 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_A, 2795 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2796 if (!ok) 2797 return ((int)n); 2798 S3I(s)->tmp.reuse_message = 1; 2799 if ((S3I(s)->tmp.message_type == SSL3_MT_FINISHED) || 2800 (S3I(s)->tmp.message_type == SSL3_MT_NEWSESSION_TICKET)) 2801 return (2); 2802 2803 return (1); 2804 } 2805 2806 int 2807 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2808 { 2809 int i = 0; 2810 2811 #ifndef OPENSSL_NO_ENGINE 2812 if (s->ctx->internal->client_cert_engine) { 2813 i = ENGINE_load_ssl_client_cert( 2814 s->ctx->internal->client_cert_engine, s, 2815 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2816 if (i != 0) 2817 return (i); 2818 } 2819 #endif 2820 if (s->ctx->internal->client_cert_cb) 2821 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2822 return (i); 2823 } 2824