1 /* $OpenBSD: ssl_clnt.c,v 1.23 2018/02/08 11:30:30 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_tlsext.h" 174 175 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b); 176 177 int 178 ssl3_connect(SSL *s) 179 { 180 void (*cb)(const SSL *ssl, int type, int val) = NULL; 181 int ret = -1; 182 int new_state, state, skip = 0; 183 184 ERR_clear_error(); 185 errno = 0; 186 187 if (s->internal->info_callback != NULL) 188 cb = s->internal->info_callback; 189 else if (s->ctx->internal->info_callback != NULL) 190 cb = s->ctx->internal->info_callback; 191 192 s->internal->in_handshake++; 193 if (!SSL_in_init(s) || SSL_in_before(s)) 194 SSL_clear(s); 195 196 for (;;) { 197 state = S3I(s)->hs.state; 198 199 switch (S3I(s)->hs.state) { 200 case SSL_ST_RENEGOTIATE: 201 s->internal->renegotiate = 1; 202 S3I(s)->hs.state = SSL_ST_CONNECT; 203 s->ctx->internal->stats.sess_connect_renegotiate++; 204 /* break */ 205 case SSL_ST_BEFORE: 206 case SSL_ST_CONNECT: 207 case SSL_ST_BEFORE|SSL_ST_CONNECT: 208 case SSL_ST_OK|SSL_ST_CONNECT: 209 210 s->server = 0; 211 if (cb != NULL) 212 cb(s, SSL_CB_HANDSHAKE_START, 1); 213 214 if (SSL_IS_DTLS(s)) { 215 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) { 216 SSLerror(s, ERR_R_INTERNAL_ERROR); 217 ret = -1; 218 goto end; 219 } 220 } else { 221 if ((s->version & 0xff00) != 0x0300) { 222 SSLerror(s, ERR_R_INTERNAL_ERROR); 223 ret = -1; 224 goto end; 225 } 226 } 227 228 /* s->version=SSL3_VERSION; */ 229 s->internal->type = SSL_ST_CONNECT; 230 231 if (!ssl3_setup_init_buffer(s)) { 232 ret = -1; 233 goto end; 234 } 235 if (!ssl3_setup_buffers(s)) { 236 ret = -1; 237 goto end; 238 } 239 if (!ssl_init_wbio_buffer(s, 0)) { 240 ret = -1; 241 goto end; 242 } 243 244 /* don't push the buffering BIO quite yet */ 245 246 if (!SSL_IS_DTLS(s)) { 247 if (!tls1_init_finished_mac(s)) { 248 ret = -1; 249 goto end; 250 } 251 } 252 253 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 254 s->ctx->internal->stats.sess_connect++; 255 s->internal->init_num = 0; 256 257 if (SSL_IS_DTLS(s)) { 258 /* mark client_random uninitialized */ 259 memset(s->s3->client_random, 0, 260 sizeof(s->s3->client_random)); 261 D1I(s)->send_cookie = 0; 262 s->internal->hit = 0; 263 } 264 break; 265 266 case SSL3_ST_CW_CLNT_HELLO_A: 267 case SSL3_ST_CW_CLNT_HELLO_B: 268 s->internal->shutdown = 0; 269 270 if (SSL_IS_DTLS(s)) { 271 /* every DTLS ClientHello resets Finished MAC */ 272 if (!tls1_init_finished_mac(s)) { 273 ret = -1; 274 goto end; 275 } 276 277 dtls1_start_timer(s); 278 } 279 280 ret = ssl3_send_client_hello(s); 281 if (ret <= 0) 282 goto end; 283 284 if (SSL_IS_DTLS(s) && D1I(s)->send_cookie) { 285 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 286 S3I(s)->hs.next_state = SSL3_ST_CR_SRVR_HELLO_A; 287 } else 288 S3I(s)->hs.state = SSL3_ST_CR_SRVR_HELLO_A; 289 290 s->internal->init_num = 0; 291 292 /* turn on buffering for the next lot of output */ 293 if (s->bbio != s->wbio) 294 s->wbio = BIO_push(s->bbio, s->wbio); 295 296 break; 297 298 case SSL3_ST_CR_SRVR_HELLO_A: 299 case SSL3_ST_CR_SRVR_HELLO_B: 300 ret = ssl3_get_server_hello(s); 301 if (ret <= 0) 302 goto end; 303 304 if (s->internal->hit) { 305 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 306 if (!SSL_IS_DTLS(s)) { 307 if (s->internal->tlsext_ticket_expected) { 308 /* receive renewed session ticket */ 309 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 310 } 311 } 312 } else if (SSL_IS_DTLS(s)) { 313 S3I(s)->hs.state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 314 } else { 315 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 316 } 317 s->internal->init_num = 0; 318 break; 319 320 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 321 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 322 ret = dtls1_get_hello_verify(s); 323 if (ret <= 0) 324 goto end; 325 dtls1_stop_timer(s); 326 if (D1I(s)->send_cookie) /* start again, with a cookie */ 327 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 328 else 329 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 330 s->internal->init_num = 0; 331 break; 332 333 case SSL3_ST_CR_CERT_A: 334 case SSL3_ST_CR_CERT_B: 335 ret = ssl3_check_finished(s); 336 if (ret <= 0) 337 goto end; 338 if (ret == 2) { 339 s->internal->hit = 1; 340 if (s->internal->tlsext_ticket_expected) 341 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 342 else 343 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 344 s->internal->init_num = 0; 345 break; 346 } 347 /* Check if it is anon DH/ECDH. */ 348 if (!(S3I(s)->hs.new_cipher->algorithm_auth & 349 SSL_aNULL)) { 350 ret = ssl3_get_server_certificate(s); 351 if (ret <= 0) 352 goto end; 353 if (s->internal->tlsext_status_expected) 354 S3I(s)->hs.state = SSL3_ST_CR_CERT_STATUS_A; 355 else 356 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 357 } else { 358 skip = 1; 359 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 360 } 361 s->internal->init_num = 0; 362 break; 363 364 case SSL3_ST_CR_KEY_EXCH_A: 365 case SSL3_ST_CR_KEY_EXCH_B: 366 ret = ssl3_get_server_key_exchange(s); 367 if (ret <= 0) 368 goto end; 369 S3I(s)->hs.state = SSL3_ST_CR_CERT_REQ_A; 370 s->internal->init_num = 0; 371 372 /* 373 * At this point we check that we have the 374 * required stuff from the server. 375 */ 376 if (!ssl3_check_cert_and_algorithm(s)) { 377 ret = -1; 378 goto end; 379 } 380 break; 381 382 case SSL3_ST_CR_CERT_REQ_A: 383 case SSL3_ST_CR_CERT_REQ_B: 384 ret = ssl3_get_certificate_request(s); 385 if (ret <= 0) 386 goto end; 387 S3I(s)->hs.state = SSL3_ST_CR_SRVR_DONE_A; 388 s->internal->init_num = 0; 389 break; 390 391 case SSL3_ST_CR_SRVR_DONE_A: 392 case SSL3_ST_CR_SRVR_DONE_B: 393 ret = ssl3_get_server_done(s); 394 if (ret <= 0) 395 goto end; 396 if (SSL_IS_DTLS(s)) 397 dtls1_stop_timer(s); 398 if (S3I(s)->tmp.cert_req) 399 S3I(s)->hs.state = SSL3_ST_CW_CERT_A; 400 else 401 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 402 s->internal->init_num = 0; 403 404 break; 405 406 case SSL3_ST_CW_CERT_A: 407 case SSL3_ST_CW_CERT_B: 408 case SSL3_ST_CW_CERT_C: 409 case SSL3_ST_CW_CERT_D: 410 if (SSL_IS_DTLS(s)) 411 dtls1_start_timer(s); 412 ret = ssl3_send_client_certificate(s); 413 if (ret <= 0) 414 goto end; 415 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 416 s->internal->init_num = 0; 417 break; 418 419 case SSL3_ST_CW_KEY_EXCH_A: 420 case SSL3_ST_CW_KEY_EXCH_B: 421 if (SSL_IS_DTLS(s)) 422 dtls1_start_timer(s); 423 ret = ssl3_send_client_key_exchange(s); 424 if (ret <= 0) 425 goto end; 426 /* 427 * EAY EAY EAY need to check for DH fix cert 428 * sent back 429 */ 430 /* 431 * For TLS, cert_req is set to 2, so a cert chain 432 * of nothing is sent, but no verify packet is sent 433 */ 434 /* 435 * XXX: For now, we do not support client 436 * authentication in ECDH cipher suites with 437 * ECDH (rather than ECDSA) certificates. 438 * We need to skip the certificate verify 439 * message when client's ECDH public key is sent 440 * inside the client certificate. 441 */ 442 if (S3I(s)->tmp.cert_req == 1) { 443 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_A; 444 } else { 445 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 446 S3I(s)->change_cipher_spec = 0; 447 } 448 if (!SSL_IS_DTLS(s)) { 449 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 450 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 451 S3I(s)->change_cipher_spec = 0; 452 } 453 } 454 455 s->internal->init_num = 0; 456 break; 457 458 case SSL3_ST_CW_CERT_VRFY_A: 459 case SSL3_ST_CW_CERT_VRFY_B: 460 if (SSL_IS_DTLS(s)) 461 dtls1_start_timer(s); 462 ret = ssl3_send_client_verify(s); 463 if (ret <= 0) 464 goto end; 465 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 466 s->internal->init_num = 0; 467 S3I(s)->change_cipher_spec = 0; 468 break; 469 470 case SSL3_ST_CW_CHANGE_A: 471 case SSL3_ST_CW_CHANGE_B: 472 if (SSL_IS_DTLS(s) && !s->internal->hit) 473 dtls1_start_timer(s); 474 ret = ssl3_send_change_cipher_spec(s, 475 SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B); 476 if (ret <= 0) 477 goto end; 478 479 S3I(s)->hs.state = SSL3_ST_CW_FINISHED_A; 480 s->internal->init_num = 0; 481 482 s->session->cipher = S3I(s)->hs.new_cipher; 483 if (!tls1_setup_key_block(s)) { 484 ret = -1; 485 goto end; 486 } 487 488 if (!tls1_change_cipher_state(s, 489 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) { 490 ret = -1; 491 goto end; 492 } 493 494 if (SSL_IS_DTLS(s)) 495 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 496 497 break; 498 499 case SSL3_ST_CW_FINISHED_A: 500 case SSL3_ST_CW_FINISHED_B: 501 if (SSL_IS_DTLS(s) && !s->internal->hit) 502 dtls1_start_timer(s); 503 ret = ssl3_send_finished(s, SSL3_ST_CW_FINISHED_A, 504 SSL3_ST_CW_FINISHED_B, TLS_MD_CLIENT_FINISH_CONST, 505 TLS_MD_CLIENT_FINISH_CONST_SIZE); 506 if (ret <= 0) 507 goto end; 508 if (!SSL_IS_DTLS(s)) 509 s->s3->flags |= SSL3_FLAGS_CCS_OK; 510 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 511 512 /* clear flags */ 513 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER; 514 if (s->internal->hit) { 515 S3I(s)->hs.next_state = SSL_ST_OK; 516 if (s->s3->flags & 517 SSL3_FLAGS_DELAY_CLIENT_FINISHED) { 518 S3I(s)->hs.state = SSL_ST_OK; 519 s->s3->flags |= SSL3_FLAGS_POP_BUFFER; 520 S3I(s)->delay_buf_pop_ret = 0; 521 } 522 } else { 523 /* Allow NewSessionTicket if ticket expected */ 524 if (s->internal->tlsext_ticket_expected) 525 S3I(s)->hs.next_state = 526 SSL3_ST_CR_SESSION_TICKET_A; 527 else 528 S3I(s)->hs.next_state = 529 SSL3_ST_CR_FINISHED_A; 530 } 531 s->internal->init_num = 0; 532 break; 533 534 case SSL3_ST_CR_SESSION_TICKET_A: 535 case SSL3_ST_CR_SESSION_TICKET_B: 536 ret = ssl3_get_new_session_ticket(s); 537 if (ret <= 0) 538 goto end; 539 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 540 s->internal->init_num = 0; 541 break; 542 543 case SSL3_ST_CR_CERT_STATUS_A: 544 case SSL3_ST_CR_CERT_STATUS_B: 545 ret = ssl3_get_cert_status(s); 546 if (ret <= 0) 547 goto end; 548 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 549 s->internal->init_num = 0; 550 break; 551 552 case SSL3_ST_CR_FINISHED_A: 553 case SSL3_ST_CR_FINISHED_B: 554 if (SSL_IS_DTLS(s)) 555 D1I(s)->change_cipher_spec_ok = 1; 556 else 557 s->s3->flags |= SSL3_FLAGS_CCS_OK; 558 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 559 SSL3_ST_CR_FINISHED_B); 560 if (ret <= 0) 561 goto end; 562 if (SSL_IS_DTLS(s)) 563 dtls1_stop_timer(s); 564 565 if (s->internal->hit) 566 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 567 else 568 S3I(s)->hs.state = SSL_ST_OK; 569 s->internal->init_num = 0; 570 break; 571 572 case SSL3_ST_CW_FLUSH: 573 s->internal->rwstate = SSL_WRITING; 574 if (BIO_flush(s->wbio) <= 0) { 575 if (SSL_IS_DTLS(s)) { 576 /* If the write error was fatal, stop trying */ 577 if (!BIO_should_retry(s->wbio)) { 578 s->internal->rwstate = SSL_NOTHING; 579 S3I(s)->hs.state = S3I(s)->hs.next_state; 580 } 581 } 582 ret = -1; 583 goto end; 584 } 585 s->internal->rwstate = SSL_NOTHING; 586 S3I(s)->hs.state = S3I(s)->hs.next_state; 587 break; 588 589 case SSL_ST_OK: 590 /* clean a few things up */ 591 tls1_cleanup_key_block(s); 592 593 if (!SSL_IS_DTLS(s)) { 594 BUF_MEM_free(s->internal->init_buf); 595 s->internal->init_buf = NULL; 596 } 597 598 /* 599 * If we are not 'joining' the last two packets, 600 * remove the buffering now 601 */ 602 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 603 ssl_free_wbio_buffer(s); 604 /* else do it later in ssl3_write */ 605 606 s->internal->init_num = 0; 607 s->internal->renegotiate = 0; 608 s->internal->new_session = 0; 609 610 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 611 if (s->internal->hit) 612 s->ctx->internal->stats.sess_hit++; 613 614 ret = 1; 615 /* s->server=0; */ 616 s->internal->handshake_func = ssl3_connect; 617 s->ctx->internal->stats.sess_connect_good++; 618 619 if (cb != NULL) 620 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 621 622 if (SSL_IS_DTLS(s)) { 623 /* done with handshaking */ 624 D1I(s)->handshake_read_seq = 0; 625 D1I(s)->next_handshake_write_seq = 0; 626 } 627 628 goto end; 629 /* break; */ 630 631 default: 632 SSLerror(s, SSL_R_UNKNOWN_STATE); 633 ret = -1; 634 goto end; 635 /* break; */ 636 } 637 638 /* did we do anything */ 639 if (!S3I(s)->tmp.reuse_message && !skip) { 640 if (s->internal->debug) { 641 if ((ret = BIO_flush(s->wbio)) <= 0) 642 goto end; 643 } 644 645 if ((cb != NULL) && (S3I(s)->hs.state != state)) { 646 new_state = S3I(s)->hs.state; 647 S3I(s)->hs.state = state; 648 cb(s, SSL_CB_CONNECT_LOOP, 1); 649 S3I(s)->hs.state = new_state; 650 } 651 } 652 skip = 0; 653 } 654 655 end: 656 s->internal->in_handshake--; 657 if (cb != NULL) 658 cb(s, SSL_CB_CONNECT_EXIT, ret); 659 660 return (ret); 661 } 662 663 int 664 ssl3_send_client_hello(SSL *s) 665 { 666 CBB cbb, client_hello, session_id, cookie, cipher_suites; 667 CBB compression_methods; 668 uint16_t max_version; 669 size_t sl; 670 671 memset(&cbb, 0, sizeof(cbb)); 672 673 if (S3I(s)->hs.state == SSL3_ST_CW_CLNT_HELLO_A) { 674 SSL_SESSION *sess = s->session; 675 676 if (ssl_supported_version_range(s, NULL, &max_version) != 1) { 677 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 678 return (-1); 679 } 680 s->client_version = s->version = max_version; 681 682 if (sess == NULL || 683 sess->ssl_version != s->version || 684 (!sess->session_id_length && !sess->tlsext_tick) || 685 sess->internal->not_resumable) { 686 if (!ssl_get_new_session(s, 0)) 687 goto err; 688 } 689 /* else use the pre-loaded session */ 690 691 /* 692 * If a DTLS ClientHello message is being resent after a 693 * HelloVerifyRequest, we must retain the original client 694 * random value. 695 */ 696 if (!SSL_IS_DTLS(s) || D1I(s)->send_cookie == 0) 697 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE); 698 699 if (!ssl3_handshake_msg_start_cbb(s, &cbb, &client_hello, 700 SSL3_MT_CLIENT_HELLO)) 701 goto err; 702 703 /* 704 * Version indicates the negotiated version: for example from 705 * an SSLv2/v3 compatible client hello). The client_version 706 * field is the maximum version we permit and it is also 707 * used in RSA encrypted premaster secrets. Some servers can 708 * choke if we initially report a higher version then 709 * renegotiate to a lower one in the premaster secret. This 710 * didn't happen with TLS 1.0 as most servers supported it 711 * but it can with TLS 1.1 or later if the server only supports 712 * 1.0. 713 * 714 * Possible scenario with previous logic: 715 * 1. Client hello indicates TLS 1.2 716 * 2. Server hello says TLS 1.0 717 * 3. RSA encrypted premaster secret uses 1.2. 718 * 4. Handhaked proceeds using TLS 1.0. 719 * 5. Server sends hello request to renegotiate. 720 * 6. Client hello indicates TLS v1.0 as we now 721 * know that is maximum server supports. 722 * 7. Server chokes on RSA encrypted premaster secret 723 * containing version 1.0. 724 * 725 * For interoperability it should be OK to always use the 726 * maximum version we support in client hello and then rely 727 * on the checking of version to ensure the servers isn't 728 * being inconsistent: for example initially negotiating with 729 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using 730 * client_version in client hello and not resetting it to 731 * the negotiated version. 732 */ 733 if (!CBB_add_u16(&client_hello, s->client_version)) 734 goto err; 735 736 /* Random stuff */ 737 if (!CBB_add_bytes(&client_hello, s->s3->client_random, 738 sizeof(s->s3->client_random))) 739 goto err; 740 741 /* Session ID */ 742 if (!CBB_add_u8_length_prefixed(&client_hello, &session_id)) 743 goto err; 744 if (!s->internal->new_session && 745 s->session->session_id_length > 0) { 746 sl = s->session->session_id_length; 747 if (sl > sizeof(s->session->session_id)) { 748 SSLerror(s, ERR_R_INTERNAL_ERROR); 749 goto err; 750 } 751 if (!CBB_add_bytes(&session_id, 752 s->session->session_id, sl)) 753 goto err; 754 } 755 756 /* DTLS Cookie. */ 757 if (SSL_IS_DTLS(s)) { 758 if (D1I(s)->cookie_len > sizeof(D1I(s)->cookie)) { 759 SSLerror(s, ERR_R_INTERNAL_ERROR); 760 goto err; 761 } 762 if (!CBB_add_u8_length_prefixed(&client_hello, &cookie)) 763 goto err; 764 if (!CBB_add_bytes(&cookie, D1I(s)->cookie, 765 D1I(s)->cookie_len)) 766 goto err; 767 } 768 769 /* Ciphers supported */ 770 if (!CBB_add_u16_length_prefixed(&client_hello, &cipher_suites)) 771 return 0; 772 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), 773 &cipher_suites)) { 774 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE); 775 goto err; 776 } 777 778 /* Add in compression methods (null) */ 779 if (!CBB_add_u8_length_prefixed(&client_hello, 780 &compression_methods)) 781 goto err; 782 if (!CBB_add_u8(&compression_methods, 0)) 783 goto err; 784 785 /* TLS extensions */ 786 if (!tlsext_clienthello_build(s, &client_hello)) { 787 SSLerror(s, ERR_R_INTERNAL_ERROR); 788 goto err; 789 } 790 791 if (!ssl3_handshake_msg_finish_cbb(s, &cbb)) 792 goto err; 793 794 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_B; 795 } 796 797 /* SSL3_ST_CW_CLNT_HELLO_B */ 798 return (ssl3_handshake_write(s)); 799 800 err: 801 CBB_cleanup(&cbb); 802 803 return (-1); 804 } 805 806 int 807 ssl3_get_server_hello(SSL *s) 808 { 809 CBS cbs, server_random, session_id; 810 uint16_t server_version, cipher_suite; 811 uint16_t min_version, max_version; 812 uint8_t compression_method; 813 STACK_OF(SSL_CIPHER) *sk; 814 const SSL_CIPHER *cipher; 815 const SSL_METHOD *method; 816 unsigned long alg_k; 817 size_t outlen; 818 int i, al, ok; 819 long n; 820 821 s->internal->first_packet = 1; 822 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 823 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, /* ?? */ &ok); 824 if (!ok) 825 return ((int)n); 826 s->internal->first_packet = 0; 827 828 if (n < 0) 829 goto truncated; 830 831 CBS_init(&cbs, s->internal->init_msg, n); 832 833 if (SSL_IS_DTLS(s)) { 834 if (S3I(s)->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 835 if (D1I(s)->send_cookie == 0) { 836 S3I(s)->tmp.reuse_message = 1; 837 return (1); 838 } else { 839 /* Already sent a cookie. */ 840 al = SSL_AD_UNEXPECTED_MESSAGE; 841 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 842 goto f_err; 843 } 844 } 845 } 846 847 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_HELLO) { 848 al = SSL_AD_UNEXPECTED_MESSAGE; 849 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 850 goto f_err; 851 } 852 853 if (!CBS_get_u16(&cbs, &server_version)) 854 goto truncated; 855 856 if (ssl_supported_version_range(s, &min_version, &max_version) != 1) { 857 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 858 goto err; 859 } 860 861 if (server_version < min_version || server_version > max_version) { 862 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 863 s->version = (s->version & 0xff00) | (server_version & 0xff); 864 al = SSL_AD_PROTOCOL_VERSION; 865 goto f_err; 866 } 867 s->version = server_version; 868 869 if ((method = tls1_get_client_method(server_version)) == NULL) 870 method = dtls1_get_client_method(server_version); 871 if (method == NULL) { 872 SSLerror(s, ERR_R_INTERNAL_ERROR); 873 goto err; 874 } 875 s->method = method; 876 877 /* Server random. */ 878 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 879 goto truncated; 880 if (!CBS_write_bytes(&server_random, s->s3->server_random, 881 sizeof(s->s3->server_random), NULL)) 882 goto err; 883 884 /* Session ID. */ 885 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 886 goto truncated; 887 888 if ((CBS_len(&session_id) > sizeof(s->session->session_id)) || 889 (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE)) { 890 al = SSL_AD_ILLEGAL_PARAMETER; 891 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 892 goto f_err; 893 } 894 895 /* Cipher suite. */ 896 if (!CBS_get_u16(&cbs, &cipher_suite)) 897 goto truncated; 898 899 /* 900 * Check if we want to resume the session based on external 901 * pre-shared secret. 902 */ 903 if (s->internal->tls_session_secret_cb) { 904 SSL_CIPHER *pref_cipher = NULL; 905 s->session->master_key_length = sizeof(s->session->master_key); 906 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 907 &s->session->master_key_length, NULL, &pref_cipher, 908 s->internal->tls_session_secret_cb_arg)) { 909 s->session->cipher = pref_cipher ? pref_cipher : 910 ssl3_get_cipher_by_value(cipher_suite); 911 s->s3->flags |= SSL3_FLAGS_CCS_OK; 912 } 913 } 914 915 if (s->session->session_id_length != 0 && 916 CBS_mem_equal(&session_id, s->session->session_id, 917 s->session->session_id_length)) { 918 if (s->sid_ctx_length != s->session->sid_ctx_length || 919 timingsafe_memcmp(s->session->sid_ctx, 920 s->sid_ctx, s->sid_ctx_length) != 0) { 921 /* actually a client application bug */ 922 al = SSL_AD_ILLEGAL_PARAMETER; 923 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 924 goto f_err; 925 } 926 s->s3->flags |= SSL3_FLAGS_CCS_OK; 927 s->internal->hit = 1; 928 } else { 929 /* a miss or crap from the other end */ 930 931 /* If we were trying for session-id reuse, make a new 932 * SSL_SESSION so we don't stuff up other people */ 933 s->internal->hit = 0; 934 if (s->session->session_id_length > 0) { 935 if (!ssl_get_new_session(s, 0)) { 936 al = SSL_AD_INTERNAL_ERROR; 937 goto f_err; 938 } 939 } 940 941 /* 942 * XXX - improve the handling for the case where there is a 943 * zero length session identifier. 944 */ 945 if (!CBS_write_bytes(&session_id, s->session->session_id, 946 sizeof(s->session->session_id), &outlen)) 947 goto err; 948 s->session->session_id_length = outlen; 949 950 s->session->ssl_version = s->version; 951 } 952 953 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 954 al = SSL_AD_ILLEGAL_PARAMETER; 955 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 956 goto f_err; 957 } 958 959 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 960 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 961 (TLS1_get_version(s) < TLS1_2_VERSION)) { 962 al = SSL_AD_ILLEGAL_PARAMETER; 963 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 964 goto f_err; 965 } 966 967 sk = ssl_get_ciphers_by_id(s); 968 i = sk_SSL_CIPHER_find(sk, cipher); 969 if (i < 0) { 970 /* we did not say we would use this cipher */ 971 al = SSL_AD_ILLEGAL_PARAMETER; 972 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 973 goto f_err; 974 } 975 976 /* 977 * Depending on the session caching (internal/external), the cipher 978 * and/or cipher_id values may not be set. Make sure that 979 * cipher_id is set and use it for comparison. 980 */ 981 if (s->session->cipher) 982 s->session->cipher_id = s->session->cipher->id; 983 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 984 al = SSL_AD_ILLEGAL_PARAMETER; 985 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 986 goto f_err; 987 } 988 S3I(s)->hs.new_cipher = cipher; 989 990 if (!tls1_handshake_hash_init(s)) 991 goto err; 992 993 /* 994 * Don't digest cached records if no sigalgs: we may need them for 995 * client authentication. 996 */ 997 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 998 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) && 999 !tls1_digest_cached_records(s)) { 1000 al = SSL_AD_INTERNAL_ERROR; 1001 goto f_err; 1002 } 1003 1004 if (!CBS_get_u8(&cbs, &compression_method)) 1005 goto truncated; 1006 1007 if (compression_method != 0) { 1008 al = SSL_AD_ILLEGAL_PARAMETER; 1009 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1010 goto f_err; 1011 } 1012 1013 if (!tlsext_serverhello_parse(s, &cbs, &al)) { 1014 SSLerror(s, SSL_R_PARSE_TLSEXT); 1015 goto f_err; 1016 } 1017 1018 /* 1019 * Determine if we need to see RI. Strictly speaking if we want to 1020 * avoid an attack we should *always* see RI even on initial server 1021 * hello because the client doesn't see any renegotiation during an 1022 * attack. However this would mean we could not connect to any server 1023 * which doesn't support RI so for the immediate future tolerate RI 1024 * absence on initial connect only. 1025 */ 1026 if (!S3I(s)->renegotiate_seen && 1027 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1028 al = SSL_AD_HANDSHAKE_FAILURE; 1029 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1030 goto f_err; 1031 } 1032 1033 if (ssl_check_serverhello_tlsext(s) <= 0) { 1034 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1035 goto err; 1036 } 1037 1038 return (1); 1039 1040 truncated: 1041 /* wrong packet length */ 1042 al = SSL_AD_DECODE_ERROR; 1043 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1044 f_err: 1045 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1046 err: 1047 return (-1); 1048 } 1049 1050 int 1051 ssl3_get_server_certificate(SSL *s) 1052 { 1053 int al, i, ok, ret = -1; 1054 long n; 1055 CBS cbs, cert_list; 1056 X509 *x = NULL; 1057 const unsigned char *q; 1058 STACK_OF(X509) *sk = NULL; 1059 SESS_CERT *sc; 1060 EVP_PKEY *pkey = NULL; 1061 1062 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_A, 1063 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 1064 1065 if (!ok) 1066 return ((int)n); 1067 1068 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1069 S3I(s)->tmp.reuse_message = 1; 1070 return (1); 1071 } 1072 1073 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 1074 al = SSL_AD_UNEXPECTED_MESSAGE; 1075 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1076 goto f_err; 1077 } 1078 1079 1080 if ((sk = sk_X509_new_null()) == NULL) { 1081 SSLerror(s, ERR_R_MALLOC_FAILURE); 1082 goto err; 1083 } 1084 1085 if (n < 0) 1086 goto truncated; 1087 1088 CBS_init(&cbs, s->internal->init_msg, n); 1089 if (CBS_len(&cbs) < 3) 1090 goto truncated; 1091 1092 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1093 CBS_len(&cbs) != 0) { 1094 al = SSL_AD_DECODE_ERROR; 1095 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1096 goto f_err; 1097 } 1098 1099 while (CBS_len(&cert_list) > 0) { 1100 CBS cert; 1101 1102 if (CBS_len(&cert_list) < 3) 1103 goto truncated; 1104 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1105 al = SSL_AD_DECODE_ERROR; 1106 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1107 goto f_err; 1108 } 1109 1110 q = CBS_data(&cert); 1111 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1112 if (x == NULL) { 1113 al = SSL_AD_BAD_CERTIFICATE; 1114 SSLerror(s, ERR_R_ASN1_LIB); 1115 goto f_err; 1116 } 1117 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1118 al = SSL_AD_DECODE_ERROR; 1119 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1120 goto f_err; 1121 } 1122 if (!sk_X509_push(sk, x)) { 1123 SSLerror(s, ERR_R_MALLOC_FAILURE); 1124 goto err; 1125 } 1126 x = NULL; 1127 } 1128 1129 i = ssl_verify_cert_chain(s, sk); 1130 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1131 al = ssl_verify_alarm_type(s->verify_result); 1132 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1133 goto f_err; 1134 1135 } 1136 ERR_clear_error(); /* but we keep s->verify_result */ 1137 1138 sc = ssl_sess_cert_new(); 1139 if (sc == NULL) 1140 goto err; 1141 ssl_sess_cert_free(SSI(s)->sess_cert); 1142 SSI(s)->sess_cert = sc; 1143 1144 sc->cert_chain = sk; 1145 /* 1146 * Inconsistency alert: cert_chain does include the peer's 1147 * certificate, which we don't include in s3_srvr.c 1148 */ 1149 x = sk_X509_value(sk, 0); 1150 sk = NULL; 1151 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1152 1153 pkey = X509_get_pubkey(x); 1154 1155 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1156 x = NULL; 1157 al = SSL3_AL_FATAL; 1158 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1159 goto f_err; 1160 } 1161 1162 i = ssl_cert_type(x, pkey); 1163 if (i < 0) { 1164 x = NULL; 1165 al = SSL3_AL_FATAL; 1166 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1167 goto f_err; 1168 } 1169 1170 sc->peer_cert_type = i; 1171 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1172 /* 1173 * Why would the following ever happen? 1174 * We just created sc a couple of lines ago. 1175 */ 1176 X509_free(sc->peer_pkeys[i].x509); 1177 sc->peer_pkeys[i].x509 = x; 1178 sc->peer_key = &(sc->peer_pkeys[i]); 1179 1180 X509_free(s->session->peer); 1181 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1182 s->session->peer = x; 1183 s->session->verify_result = s->verify_result; 1184 1185 x = NULL; 1186 ret = 1; 1187 1188 if (0) { 1189 truncated: 1190 /* wrong packet length */ 1191 al = SSL_AD_DECODE_ERROR; 1192 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1193 f_err: 1194 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1195 } 1196 err: 1197 EVP_PKEY_free(pkey); 1198 X509_free(x); 1199 sk_X509_pop_free(sk, X509_free); 1200 1201 return (ret); 1202 } 1203 1204 static int 1205 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, unsigned char **pp, long *nn) 1206 { 1207 CBS cbs, dhp, dhg, dhpk; 1208 BN_CTX *bn_ctx = NULL; 1209 SESS_CERT *sc = NULL; 1210 DH *dh = NULL; 1211 long alg_a; 1212 int al; 1213 1214 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1215 sc = SSI(s)->sess_cert; 1216 1217 if (*nn < 0) 1218 goto err; 1219 1220 CBS_init(&cbs, *pp, *nn); 1221 1222 if ((dh = DH_new()) == NULL) { 1223 SSLerror(s, ERR_R_DH_LIB); 1224 goto err; 1225 } 1226 1227 if (!CBS_get_u16_length_prefixed(&cbs, &dhp)) 1228 goto truncated; 1229 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1230 SSLerror(s, ERR_R_BN_LIB); 1231 goto err; 1232 } 1233 1234 if (!CBS_get_u16_length_prefixed(&cbs, &dhg)) 1235 goto truncated; 1236 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1237 SSLerror(s, ERR_R_BN_LIB); 1238 goto err; 1239 } 1240 1241 if (!CBS_get_u16_length_prefixed(&cbs, &dhpk)) 1242 goto truncated; 1243 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1244 NULL)) == NULL) { 1245 SSLerror(s, ERR_R_BN_LIB); 1246 goto err; 1247 } 1248 1249 /* 1250 * Check the strength of the DH key just constructed. 1251 * Discard keys weaker than 1024 bits. 1252 */ 1253 if (DH_size(dh) < 1024 / 8) { 1254 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1255 goto err; 1256 } 1257 1258 if (alg_a & SSL_aRSA) 1259 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1260 else 1261 /* XXX - Anonymous DH, so no certificate or pkey. */ 1262 *pkey = NULL; 1263 1264 sc->peer_dh_tmp = dh; 1265 1266 *nn = CBS_len(&cbs); 1267 *pp = (unsigned char *)CBS_data(&cbs); 1268 1269 return (1); 1270 1271 truncated: 1272 al = SSL_AD_DECODE_ERROR; 1273 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1274 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1275 1276 err: 1277 DH_free(dh); 1278 BN_CTX_free(bn_ctx); 1279 1280 return (-1); 1281 } 1282 1283 static int 1284 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1285 { 1286 const EC_GROUP *group; 1287 EC_GROUP *ngroup = NULL; 1288 EC_POINT *point = NULL; 1289 BN_CTX *bn_ctx = NULL; 1290 EC_KEY *ecdh = NULL; 1291 int ret = -1; 1292 1293 /* 1294 * Extract the server's ephemeral ECDH public key. 1295 */ 1296 1297 if ((ecdh = EC_KEY_new()) == NULL) { 1298 SSLerror(s, ERR_R_MALLOC_FAILURE); 1299 goto err; 1300 } 1301 1302 if ((ngroup = EC_GROUP_new_by_curve_name(nid)) == NULL) { 1303 SSLerror(s, ERR_R_EC_LIB); 1304 goto err; 1305 } 1306 if (EC_KEY_set_group(ecdh, ngroup) == 0) { 1307 SSLerror(s, ERR_R_EC_LIB); 1308 goto err; 1309 } 1310 1311 group = EC_KEY_get0_group(ecdh); 1312 1313 if ((point = EC_POINT_new(group)) == NULL || 1314 (bn_ctx = BN_CTX_new()) == NULL) { 1315 SSLerror(s, ERR_R_MALLOC_FAILURE); 1316 goto err; 1317 } 1318 1319 if (EC_POINT_oct2point(group, point, CBS_data(public), 1320 CBS_len(public), bn_ctx) == 0) { 1321 SSLerror(s, SSL_R_BAD_ECPOINT); 1322 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1323 goto err; 1324 } 1325 1326 EC_KEY_set_public_key(ecdh, point); 1327 sc->peer_ecdh_tmp = ecdh; 1328 ecdh = NULL; 1329 1330 ret = 1; 1331 1332 err: 1333 BN_CTX_free(bn_ctx); 1334 EC_GROUP_free(ngroup); 1335 EC_POINT_free(point); 1336 EC_KEY_free(ecdh); 1337 1338 return (ret); 1339 } 1340 1341 static int 1342 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1343 { 1344 size_t outlen; 1345 1346 if (nid != NID_X25519) { 1347 SSLerror(s, ERR_R_INTERNAL_ERROR); 1348 goto err; 1349 } 1350 1351 if (CBS_len(public) != X25519_KEY_LENGTH) { 1352 SSLerror(s, SSL_R_BAD_ECPOINT); 1353 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1354 goto err; 1355 } 1356 1357 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1358 SSLerror(s, ERR_R_MALLOC_FAILURE); 1359 goto err; 1360 } 1361 1362 return (1); 1363 1364 err: 1365 return (-1); 1366 } 1367 1368 static int 1369 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, unsigned char **pp, long *nn) 1370 { 1371 CBS cbs, public; 1372 uint8_t curve_type; 1373 uint16_t curve_id; 1374 SESS_CERT *sc; 1375 long alg_a; 1376 int nid; 1377 int al; 1378 1379 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1380 sc = SSI(s)->sess_cert; 1381 1382 if (*nn < 0) 1383 goto err; 1384 1385 CBS_init(&cbs, *pp, *nn); 1386 1387 /* Only named curves are supported. */ 1388 if (!CBS_get_u8(&cbs, &curve_type) || 1389 curve_type != NAMED_CURVE_TYPE || 1390 !CBS_get_u16(&cbs, &curve_id)) { 1391 al = SSL_AD_DECODE_ERROR; 1392 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1393 goto f_err; 1394 } 1395 1396 /* 1397 * Check that the curve is one of our preferences - if it is not, 1398 * the server has sent us an invalid curve. 1399 */ 1400 if (tls1_check_curve(s, curve_id) != 1) { 1401 al = SSL_AD_DECODE_ERROR; 1402 SSLerror(s, SSL_R_WRONG_CURVE); 1403 goto f_err; 1404 } 1405 1406 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1407 al = SSL_AD_INTERNAL_ERROR; 1408 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1409 goto f_err; 1410 } 1411 1412 if (!CBS_get_u8_length_prefixed(&cbs, &public)) 1413 goto truncated; 1414 1415 if (nid == NID_X25519) { 1416 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1417 goto err; 1418 } else { 1419 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1420 goto err; 1421 } 1422 1423 /* 1424 * The ECC/TLS specification does not mention the use of DSA to sign 1425 * ECParameters in the server key exchange message. We do support RSA 1426 * and ECDSA. 1427 */ 1428 if (alg_a & SSL_aRSA) 1429 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1430 else if (alg_a & SSL_aECDSA) 1431 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1432 else 1433 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1434 *pkey = NULL; 1435 1436 *nn = CBS_len(&cbs); 1437 *pp = (unsigned char *)CBS_data(&cbs); 1438 1439 return (1); 1440 1441 truncated: 1442 al = SSL_AD_DECODE_ERROR; 1443 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1444 1445 f_err: 1446 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1447 1448 err: 1449 return (-1); 1450 } 1451 1452 int 1453 ssl3_get_server_key_exchange(SSL *s) 1454 { 1455 unsigned char *q, md_buf[EVP_MAX_MD_SIZE*2]; 1456 EVP_MD_CTX md_ctx; 1457 unsigned char *param, *p; 1458 int al, i, j, param_len, ok; 1459 long n, alg_k, alg_a; 1460 EVP_PKEY *pkey = NULL; 1461 const EVP_MD *md = NULL; 1462 RSA *rsa = NULL; 1463 1464 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1465 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1466 1467 /* 1468 * Use same message size as in ssl3_get_certificate_request() 1469 * as ServerKeyExchange message may be skipped. 1470 */ 1471 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1472 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1473 if (!ok) 1474 return ((int)n); 1475 1476 EVP_MD_CTX_init(&md_ctx); 1477 1478 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1479 /* 1480 * Do not skip server key exchange if this cipher suite uses 1481 * ephemeral keys. 1482 */ 1483 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1484 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1485 al = SSL_AD_UNEXPECTED_MESSAGE; 1486 goto f_err; 1487 } 1488 1489 S3I(s)->tmp.reuse_message = 1; 1490 EVP_MD_CTX_cleanup(&md_ctx); 1491 return (1); 1492 } 1493 1494 if (SSI(s)->sess_cert != NULL) { 1495 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1496 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1497 1498 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1499 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1500 1501 free(SSI(s)->sess_cert->peer_x25519_tmp); 1502 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1503 } else { 1504 SSI(s)->sess_cert = ssl_sess_cert_new(); 1505 if (SSI(s)->sess_cert == NULL) 1506 goto err; 1507 } 1508 1509 param = p = (unsigned char *)s->internal->init_msg; 1510 param_len = n; 1511 1512 if (alg_k & SSL_kDHE) { 1513 if (ssl3_get_server_kex_dhe(s, &pkey, &p, &n) != 1) 1514 goto err; 1515 } else if (alg_k & SSL_kECDHE) { 1516 if (ssl3_get_server_kex_ecdhe(s, &pkey, &p, &n) != 1) 1517 goto err; 1518 } else if (alg_k != 0) { 1519 al = SSL_AD_UNEXPECTED_MESSAGE; 1520 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1521 goto f_err; 1522 } 1523 1524 param_len = param_len - n; 1525 1526 /* if it was signed, check the signature */ 1527 if (pkey != NULL) { 1528 if (SSL_USE_SIGALGS(s)) { 1529 int sigalg = tls12_get_sigid(pkey); 1530 /* Should never happen */ 1531 if (sigalg == -1) { 1532 SSLerror(s, ERR_R_INTERNAL_ERROR); 1533 goto err; 1534 } 1535 /* 1536 * Check key type is consistent 1537 * with signature 1538 */ 1539 if (2 > n) 1540 goto truncated; 1541 if (sigalg != (int)p[1]) { 1542 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 1543 al = SSL_AD_DECODE_ERROR; 1544 goto f_err; 1545 } 1546 md = tls12_get_hash(p[0]); 1547 if (md == NULL) { 1548 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1549 al = SSL_AD_DECODE_ERROR; 1550 goto f_err; 1551 } 1552 p += 2; 1553 n -= 2; 1554 } else 1555 md = EVP_sha1(); 1556 1557 if (2 > n) 1558 goto truncated; 1559 n2s(p, i); 1560 n -= 2; 1561 j = EVP_PKEY_size(pkey); 1562 1563 if (i != n || n > j) { 1564 /* wrong packet length */ 1565 al = SSL_AD_DECODE_ERROR; 1566 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1567 goto f_err; 1568 } 1569 1570 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) { 1571 j = 0; 1572 q = md_buf; 1573 if (!EVP_DigestInit_ex(&md_ctx, EVP_md5_sha1(), NULL)) { 1574 al = SSL_AD_INTERNAL_ERROR; 1575 goto f_err; 1576 } 1577 EVP_DigestUpdate(&md_ctx, s->s3->client_random, 1578 SSL3_RANDOM_SIZE); 1579 EVP_DigestUpdate(&md_ctx, s->s3->server_random, 1580 SSL3_RANDOM_SIZE); 1581 EVP_DigestUpdate(&md_ctx, param, param_len); 1582 EVP_DigestFinal_ex(&md_ctx, q, (unsigned int *)&i); 1583 q += i; 1584 j += i; 1585 i = RSA_verify(NID_md5_sha1, md_buf, j, 1586 p, n, pkey->pkey.rsa); 1587 if (i < 0) { 1588 al = SSL_AD_DECRYPT_ERROR; 1589 SSLerror(s, SSL_R_BAD_RSA_DECRYPT); 1590 goto f_err; 1591 } 1592 if (i == 0) { 1593 /* bad signature */ 1594 al = SSL_AD_DECRYPT_ERROR; 1595 SSLerror(s, SSL_R_BAD_SIGNATURE); 1596 goto f_err; 1597 } 1598 } else { 1599 EVP_VerifyInit_ex(&md_ctx, md, NULL); 1600 EVP_VerifyUpdate(&md_ctx, s->s3->client_random, 1601 SSL3_RANDOM_SIZE); 1602 EVP_VerifyUpdate(&md_ctx, s->s3->server_random, 1603 SSL3_RANDOM_SIZE); 1604 EVP_VerifyUpdate(&md_ctx, param, param_len); 1605 if (EVP_VerifyFinal(&md_ctx, p,(int)n, pkey) <= 0) { 1606 /* bad signature */ 1607 al = SSL_AD_DECRYPT_ERROR; 1608 SSLerror(s, SSL_R_BAD_SIGNATURE); 1609 goto f_err; 1610 } 1611 } 1612 } else { 1613 /* aNULL does not need public keys. */ 1614 if (!(alg_a & SSL_aNULL)) { 1615 SSLerror(s, ERR_R_INTERNAL_ERROR); 1616 goto err; 1617 } 1618 /* still data left over */ 1619 if (n != 0) { 1620 al = SSL_AD_DECODE_ERROR; 1621 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1622 goto f_err; 1623 } 1624 } 1625 1626 EVP_PKEY_free(pkey); 1627 EVP_MD_CTX_cleanup(&md_ctx); 1628 1629 return (1); 1630 1631 truncated: 1632 /* wrong packet length */ 1633 al = SSL_AD_DECODE_ERROR; 1634 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1635 1636 f_err: 1637 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1638 1639 err: 1640 EVP_PKEY_free(pkey); 1641 RSA_free(rsa); 1642 EVP_MD_CTX_cleanup(&md_ctx); 1643 1644 return (-1); 1645 } 1646 1647 int 1648 ssl3_get_certificate_request(SSL *s) 1649 { 1650 int ok, ret = 0; 1651 long n; 1652 uint8_t ctype_num; 1653 CBS cert_request, ctypes, rdn_list; 1654 X509_NAME *xn = NULL; 1655 const unsigned char *q; 1656 STACK_OF(X509_NAME) *ca_sk = NULL; 1657 1658 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1659 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1660 1661 if (!ok) 1662 return ((int)n); 1663 1664 S3I(s)->tmp.cert_req = 0; 1665 1666 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_DONE) { 1667 S3I(s)->tmp.reuse_message = 1; 1668 /* 1669 * If we get here we don't need any cached handshake records 1670 * as we wont be doing client auth. 1671 */ 1672 if (S3I(s)->handshake_buffer) { 1673 if (!tls1_digest_cached_records(s)) 1674 goto err; 1675 } 1676 return (1); 1677 } 1678 1679 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1680 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1681 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1682 goto err; 1683 } 1684 1685 /* TLS does not like anon-DH with client cert */ 1686 if (S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL) { 1687 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1688 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1689 goto err; 1690 } 1691 1692 if (n < 0) 1693 goto truncated; 1694 CBS_init(&cert_request, s->internal->init_msg, n); 1695 1696 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1697 SSLerror(s, ERR_R_MALLOC_FAILURE); 1698 goto err; 1699 } 1700 1701 /* get the certificate types */ 1702 if (!CBS_get_u8(&cert_request, &ctype_num)) 1703 goto truncated; 1704 1705 if (ctype_num > SSL3_CT_NUMBER) 1706 ctype_num = SSL3_CT_NUMBER; 1707 if (!CBS_get_bytes(&cert_request, &ctypes, ctype_num) || 1708 !CBS_write_bytes(&ctypes, (uint8_t *)S3I(s)->tmp.ctype, 1709 sizeof(S3I(s)->tmp.ctype), NULL)) { 1710 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1711 goto err; 1712 } 1713 1714 if (SSL_USE_SIGALGS(s)) { 1715 CBS sigalgs; 1716 1717 if (CBS_len(&cert_request) < 2) { 1718 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1719 goto err; 1720 } 1721 1722 /* Check we have enough room for signature algorithms and 1723 * following length value. 1724 */ 1725 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1726 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1727 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1728 goto err; 1729 } 1730 if (!tls1_process_sigalgs(s, &sigalgs)) { 1731 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1732 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1733 goto err; 1734 } 1735 } 1736 1737 /* get the CA RDNs */ 1738 if (CBS_len(&cert_request) < 2) { 1739 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1740 goto err; 1741 } 1742 1743 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1744 CBS_len(&cert_request) != 0) { 1745 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1746 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1747 goto err; 1748 } 1749 1750 while (CBS_len(&rdn_list) > 0) { 1751 CBS rdn; 1752 1753 if (CBS_len(&rdn_list) < 2) { 1754 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1755 goto err; 1756 } 1757 1758 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1759 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1760 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1761 goto err; 1762 } 1763 1764 q = CBS_data(&rdn); 1765 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1766 ssl3_send_alert(s, SSL3_AL_FATAL, 1767 SSL_AD_DECODE_ERROR); 1768 SSLerror(s, ERR_R_ASN1_LIB); 1769 goto err; 1770 } 1771 1772 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1773 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1774 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1775 goto err; 1776 } 1777 if (!sk_X509_NAME_push(ca_sk, xn)) { 1778 SSLerror(s, ERR_R_MALLOC_FAILURE); 1779 goto err; 1780 } 1781 xn = NULL; /* avoid free in err block */ 1782 } 1783 1784 /* we should setup a certificate to return.... */ 1785 S3I(s)->tmp.cert_req = 1; 1786 S3I(s)->tmp.ctype_num = ctype_num; 1787 sk_X509_NAME_pop_free(S3I(s)->tmp.ca_names, X509_NAME_free); 1788 S3I(s)->tmp.ca_names = ca_sk; 1789 ca_sk = NULL; 1790 1791 ret = 1; 1792 if (0) { 1793 truncated: 1794 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1795 } 1796 err: 1797 X509_NAME_free(xn); 1798 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1799 return (ret); 1800 } 1801 1802 static int 1803 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1804 { 1805 return (X509_NAME_cmp(*a, *b)); 1806 } 1807 1808 int 1809 ssl3_get_new_session_ticket(SSL *s) 1810 { 1811 int ok, al, ret = 0; 1812 uint32_t lifetime_hint; 1813 long n; 1814 CBS cbs, session_ticket; 1815 1816 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1817 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1818 if (!ok) 1819 return ((int)n); 1820 1821 if (S3I(s)->tmp.message_type == SSL3_MT_FINISHED) { 1822 S3I(s)->tmp.reuse_message = 1; 1823 return (1); 1824 } 1825 if (S3I(s)->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) { 1826 al = SSL_AD_UNEXPECTED_MESSAGE; 1827 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1828 goto f_err; 1829 } 1830 1831 if (n < 0) { 1832 al = SSL_AD_DECODE_ERROR; 1833 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1834 goto f_err; 1835 } 1836 1837 CBS_init(&cbs, s->internal->init_msg, n); 1838 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1839 #if UINT32_MAX > LONG_MAX 1840 lifetime_hint > LONG_MAX || 1841 #endif 1842 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1843 CBS_len(&cbs) != 0) { 1844 al = SSL_AD_DECODE_ERROR; 1845 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1846 goto f_err; 1847 } 1848 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1849 1850 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1851 &s->session->tlsext_ticklen)) { 1852 SSLerror(s, ERR_R_MALLOC_FAILURE); 1853 goto err; 1854 } 1855 1856 /* 1857 * There are two ways to detect a resumed ticket sesion. 1858 * One is to set an appropriate session ID and then the server 1859 * must return a match in ServerHello. This allows the normal 1860 * client session ID matching to work and we know much 1861 * earlier that the ticket has been accepted. 1862 * 1863 * The other way is to set zero length session ID when the 1864 * ticket is presented and rely on the handshake to determine 1865 * session resumption. 1866 * 1867 * We choose the former approach because this fits in with 1868 * assumptions elsewhere in OpenSSL. The session ID is set 1869 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1870 * ticket. 1871 */ 1872 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1873 s->session->session_id, &s->session->session_id_length, 1874 EVP_sha256(), NULL); 1875 ret = 1; 1876 return (ret); 1877 f_err: 1878 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1879 err: 1880 return (-1); 1881 } 1882 1883 int 1884 ssl3_get_cert_status(SSL *s) 1885 { 1886 CBS cert_status, response; 1887 size_t stow_len; 1888 int ok, al; 1889 long n; 1890 uint8_t status_type; 1891 1892 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1893 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 1894 16384, &ok); 1895 1896 if (!ok) 1897 return ((int)n); 1898 1899 if (n < 0) { 1900 /* need at least status type + length */ 1901 al = SSL_AD_DECODE_ERROR; 1902 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1903 goto f_err; 1904 } 1905 1906 CBS_init(&cert_status, s->internal->init_msg, n); 1907 if (!CBS_get_u8(&cert_status, &status_type) || 1908 CBS_len(&cert_status) < 3) { 1909 /* need at least status type + length */ 1910 al = SSL_AD_DECODE_ERROR; 1911 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1912 goto f_err; 1913 } 1914 1915 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1916 al = SSL_AD_DECODE_ERROR; 1917 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1918 goto f_err; 1919 } 1920 1921 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1922 CBS_len(&cert_status) != 0) { 1923 al = SSL_AD_DECODE_ERROR; 1924 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1925 goto f_err; 1926 } 1927 1928 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1929 &stow_len) || stow_len > INT_MAX) { 1930 s->internal->tlsext_ocsp_resplen = 0; 1931 al = SSL_AD_INTERNAL_ERROR; 1932 SSLerror(s, ERR_R_MALLOC_FAILURE); 1933 goto f_err; 1934 } 1935 s->internal->tlsext_ocsp_resplen = (int)stow_len; 1936 1937 if (s->ctx->internal->tlsext_status_cb) { 1938 int ret; 1939 ret = s->ctx->internal->tlsext_status_cb(s, 1940 s->ctx->internal->tlsext_status_arg); 1941 if (ret == 0) { 1942 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1943 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1944 goto f_err; 1945 } 1946 if (ret < 0) { 1947 al = SSL_AD_INTERNAL_ERROR; 1948 SSLerror(s, ERR_R_MALLOC_FAILURE); 1949 goto f_err; 1950 } 1951 } 1952 return (1); 1953 f_err: 1954 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1955 return (-1); 1956 } 1957 1958 int 1959 ssl3_get_server_done(SSL *s) 1960 { 1961 int ok, ret = 0; 1962 long n; 1963 1964 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1965 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1966 30, /* should be very small, like 0 :-) */ &ok); 1967 1968 if (!ok) 1969 return ((int)n); 1970 if (n > 0) { 1971 /* should contain no data */ 1972 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1973 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1974 return (-1); 1975 } 1976 ret = 1; 1977 return (ret); 1978 } 1979 1980 static int 1981 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1982 { 1983 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1984 unsigned char *enc_pms = NULL; 1985 EVP_PKEY *pkey = NULL; 1986 int ret = -1; 1987 int enc_len; 1988 CBB epms; 1989 1990 /* 1991 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1992 */ 1993 1994 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1995 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1996 pkey->pkey.rsa == NULL) { 1997 SSLerror(s, ERR_R_INTERNAL_ERROR); 1998 goto err; 1999 } 2000 2001 pms[0] = s->client_version >> 8; 2002 pms[1] = s->client_version & 0xff; 2003 arc4random_buf(&pms[2], sizeof(pms) - 2); 2004 2005 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 2006 SSLerror(s, ERR_R_MALLOC_FAILURE); 2007 goto err; 2008 } 2009 2010 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 2011 RSA_PKCS1_PADDING); 2012 if (enc_len <= 0) { 2013 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 2014 goto err; 2015 } 2016 2017 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 2018 goto err; 2019 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 2020 goto err; 2021 if (!CBB_flush(cbb)) 2022 goto err; 2023 2024 s->session->master_key_length = 2025 tls1_generate_master_secret(s, 2026 s->session->master_key, pms, sizeof(pms)); 2027 2028 ret = 1; 2029 2030 err: 2031 explicit_bzero(pms, sizeof(pms)); 2032 EVP_PKEY_free(pkey); 2033 free(enc_pms); 2034 2035 return (ret); 2036 } 2037 2038 static int 2039 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2040 { 2041 DH *dh_srvr = NULL, *dh_clnt = NULL; 2042 unsigned char *key = NULL; 2043 int key_size = 0, key_len; 2044 unsigned char *data; 2045 int ret = -1; 2046 CBB dh_Yc; 2047 2048 /* Ensure that we have an ephemeral key for DHE. */ 2049 if (sess_cert->peer_dh_tmp == NULL) { 2050 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2051 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 2052 goto err; 2053 } 2054 dh_srvr = sess_cert->peer_dh_tmp; 2055 2056 /* Generate a new random key. */ 2057 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2058 SSLerror(s, ERR_R_DH_LIB); 2059 goto err; 2060 } 2061 if (!DH_generate_key(dh_clnt)) { 2062 SSLerror(s, ERR_R_DH_LIB); 2063 goto err; 2064 } 2065 key_size = DH_size(dh_clnt); 2066 if ((key = malloc(key_size)) == NULL) { 2067 SSLerror(s, ERR_R_MALLOC_FAILURE); 2068 goto err; 2069 } 2070 key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt); 2071 if (key_len <= 0) { 2072 SSLerror(s, ERR_R_DH_LIB); 2073 goto err; 2074 } 2075 2076 /* Generate master key from the result. */ 2077 s->session->master_key_length = 2078 tls1_generate_master_secret(s, 2079 s->session->master_key, key, key_len); 2080 2081 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2082 goto err; 2083 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2084 goto err; 2085 BN_bn2bin(dh_clnt->pub_key, data); 2086 if (!CBB_flush(cbb)) 2087 goto err; 2088 2089 ret = 1; 2090 2091 err: 2092 DH_free(dh_clnt); 2093 freezero(key, key_size); 2094 2095 return (ret); 2096 } 2097 2098 static int 2099 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2100 { 2101 const EC_GROUP *group = NULL; 2102 const EC_POINT *point = NULL; 2103 EC_KEY *ecdh = NULL; 2104 BN_CTX *bn_ctx = NULL; 2105 unsigned char *key = NULL; 2106 unsigned char *data; 2107 size_t encoded_len; 2108 int key_size = 0, key_len; 2109 int ret = -1; 2110 CBB ecpoint; 2111 2112 if ((group = EC_KEY_get0_group(sc->peer_ecdh_tmp)) == NULL || 2113 (point = EC_KEY_get0_public_key(sc->peer_ecdh_tmp)) == NULL) { 2114 SSLerror(s, ERR_R_INTERNAL_ERROR); 2115 goto err; 2116 } 2117 2118 if ((ecdh = EC_KEY_new()) == NULL) { 2119 SSLerror(s, ERR_R_MALLOC_FAILURE); 2120 goto err; 2121 } 2122 2123 if (!EC_KEY_set_group(ecdh, group)) { 2124 SSLerror(s, ERR_R_EC_LIB); 2125 goto err; 2126 } 2127 2128 /* Generate a new ECDH key pair. */ 2129 if (!(EC_KEY_generate_key(ecdh))) { 2130 SSLerror(s, ERR_R_ECDH_LIB); 2131 goto err; 2132 } 2133 if ((key_size = ECDH_size(ecdh)) <= 0) { 2134 SSLerror(s, ERR_R_ECDH_LIB); 2135 goto err; 2136 } 2137 if ((key = malloc(key_size)) == NULL) { 2138 SSLerror(s, ERR_R_MALLOC_FAILURE); 2139 } 2140 key_len = ECDH_compute_key(key, key_size, point, ecdh, NULL); 2141 if (key_len <= 0) { 2142 SSLerror(s, ERR_R_ECDH_LIB); 2143 goto err; 2144 } 2145 2146 /* Generate master key from the result. */ 2147 s->session->master_key_length = 2148 tls1_generate_master_secret(s, 2149 s->session->master_key, key, key_len); 2150 2151 encoded_len = EC_POINT_point2oct(group, EC_KEY_get0_public_key(ecdh), 2152 POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL); 2153 if (encoded_len == 0) { 2154 SSLerror(s, ERR_R_ECDH_LIB); 2155 goto err; 2156 } 2157 2158 if ((bn_ctx = BN_CTX_new()) == NULL) { 2159 SSLerror(s, ERR_R_MALLOC_FAILURE); 2160 goto err; 2161 } 2162 2163 /* Encode the public key. */ 2164 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2165 goto err; 2166 if (!CBB_add_space(&ecpoint, &data, encoded_len)) 2167 goto err; 2168 if (EC_POINT_point2oct(group, EC_KEY_get0_public_key(ecdh), 2169 POINT_CONVERSION_UNCOMPRESSED, data, encoded_len, 2170 bn_ctx) == 0) 2171 goto err; 2172 if (!CBB_flush(cbb)) 2173 goto err; 2174 2175 ret = 1; 2176 2177 err: 2178 freezero(key, key_size); 2179 2180 BN_CTX_free(bn_ctx); 2181 EC_KEY_free(ecdh); 2182 2183 return (ret); 2184 } 2185 2186 static int 2187 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2188 { 2189 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2190 int ret = -1; 2191 CBB ecpoint; 2192 2193 /* Generate X25519 key pair and derive shared key. */ 2194 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2195 goto err; 2196 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2197 goto err; 2198 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2199 goto err; 2200 X25519_keypair(public_key, private_key); 2201 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2202 goto err; 2203 2204 /* Serialize the public key. */ 2205 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2206 goto err; 2207 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2208 goto err; 2209 if (!CBB_flush(cbb)) 2210 goto err; 2211 2212 /* Generate master key from the result. */ 2213 s->session->master_key_length = 2214 tls1_generate_master_secret(s, 2215 s->session->master_key, shared_key, X25519_KEY_LENGTH); 2216 2217 ret = 1; 2218 2219 err: 2220 free(public_key); 2221 freezero(private_key, X25519_KEY_LENGTH); 2222 freezero(shared_key, X25519_KEY_LENGTH); 2223 2224 return (ret); 2225 } 2226 2227 static int 2228 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2229 { 2230 if (sc->peer_x25519_tmp != NULL) { 2231 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2232 goto err; 2233 } else if (sc->peer_ecdh_tmp != NULL) { 2234 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2235 goto err; 2236 } else { 2237 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2238 SSLerror(s, ERR_R_INTERNAL_ERROR); 2239 goto err; 2240 } 2241 2242 return (1); 2243 2244 err: 2245 return (-1); 2246 } 2247 2248 static int 2249 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2250 { 2251 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2252 EVP_PKEY *pub_key = NULL; 2253 EVP_PKEY_CTX *pkey_ctx; 2254 X509 *peer_cert; 2255 size_t msglen; 2256 unsigned int md_len; 2257 EVP_MD_CTX *ukm_hash; 2258 int ret = -1; 2259 int nid; 2260 CBB gostblob; 2261 2262 /* Get server sertificate PKEY and create ctx from it */ 2263 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2264 if (peer_cert == NULL) { 2265 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2266 goto err; 2267 } 2268 2269 pub_key = X509_get_pubkey(peer_cert); 2270 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2271 2272 /* 2273 * If we have send a certificate, and certificate key parameters match 2274 * those of server certificate, use certificate key for key exchange. 2275 * Otherwise, generate ephemeral key pair. 2276 */ 2277 EVP_PKEY_encrypt_init(pkey_ctx); 2278 2279 /* Generate session key. */ 2280 arc4random_buf(premaster_secret, 32); 2281 2282 /* 2283 * If we have client certificate, use its secret as peer key. 2284 */ 2285 if (S3I(s)->tmp.cert_req && s->cert->key->privatekey) { 2286 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2287 s->cert->key->privatekey) <=0) { 2288 /* 2289 * If there was an error - just ignore it. 2290 * Ephemeral key would be used. 2291 */ 2292 ERR_clear_error(); 2293 } 2294 } 2295 2296 /* 2297 * Compute shared IV and store it in algorithm-specific context data. 2298 */ 2299 ukm_hash = EVP_MD_CTX_create(); 2300 if (ukm_hash == NULL) { 2301 SSLerror(s, ERR_R_MALLOC_FAILURE); 2302 goto err; 2303 } 2304 2305 if (ssl_get_algorithm2(s) & SSL_HANDSHAKE_MAC_GOST94) 2306 nid = NID_id_GostR3411_94; 2307 else 2308 nid = NID_id_tc26_gost3411_2012_256; 2309 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2310 goto err; 2311 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2312 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2313 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2314 EVP_MD_CTX_destroy(ukm_hash); 2315 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2316 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2317 SSLerror(s, SSL_R_LIBRARY_BUG); 2318 goto err; 2319 } 2320 2321 /* 2322 * Make GOST keytransport blob message, encapsulate it into sequence. 2323 */ 2324 msglen = 255; 2325 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2326 32) < 0) { 2327 SSLerror(s, SSL_R_LIBRARY_BUG); 2328 goto err; 2329 } 2330 2331 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2332 goto err; 2333 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2334 goto err; 2335 if (!CBB_flush(cbb)) 2336 goto err; 2337 2338 /* Check if pubkey from client certificate was used. */ 2339 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2340 NULL) > 0) { 2341 /* Set flag "skip certificate verify". */ 2342 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2343 } 2344 EVP_PKEY_CTX_free(pkey_ctx); 2345 s->session->master_key_length = 2346 tls1_generate_master_secret(s, 2347 s->session->master_key, premaster_secret, 32); 2348 2349 ret = 1; 2350 2351 err: 2352 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2353 EVP_PKEY_free(pub_key); 2354 2355 return (ret); 2356 } 2357 2358 int 2359 ssl3_send_client_key_exchange(SSL *s) 2360 { 2361 SESS_CERT *sess_cert; 2362 unsigned long alg_k; 2363 CBB cbb, kex; 2364 2365 memset(&cbb, 0, sizeof(cbb)); 2366 2367 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2368 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2369 2370 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2371 ssl3_send_alert(s, SSL3_AL_FATAL, 2372 SSL_AD_UNEXPECTED_MESSAGE); 2373 SSLerror(s, ERR_R_INTERNAL_ERROR); 2374 goto err; 2375 } 2376 2377 if (!ssl3_handshake_msg_start_cbb(s, &cbb, &kex, 2378 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2379 goto err; 2380 2381 if (alg_k & SSL_kRSA) { 2382 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2383 goto err; 2384 } else if (alg_k & SSL_kDHE) { 2385 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2386 goto err; 2387 } else if (alg_k & SSL_kECDHE) { 2388 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2389 goto err; 2390 } else if (alg_k & SSL_kGOST) { 2391 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2392 goto err; 2393 } else { 2394 ssl3_send_alert(s, SSL3_AL_FATAL, 2395 SSL_AD_HANDSHAKE_FAILURE); 2396 SSLerror(s, ERR_R_INTERNAL_ERROR); 2397 goto err; 2398 } 2399 2400 if (!ssl3_handshake_msg_finish_cbb(s, &cbb)) 2401 goto err; 2402 2403 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2404 } 2405 2406 /* SSL3_ST_CW_KEY_EXCH_B */ 2407 return (ssl3_handshake_write(s)); 2408 2409 err: 2410 CBB_cleanup(&cbb); 2411 2412 return (-1); 2413 } 2414 2415 int 2416 ssl3_send_client_verify(SSL *s) 2417 { 2418 unsigned char *p; 2419 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; 2420 EVP_PKEY *pkey; 2421 EVP_PKEY_CTX *pctx = NULL; 2422 EVP_MD_CTX mctx; 2423 unsigned u = 0; 2424 unsigned long n; 2425 int j; 2426 2427 EVP_MD_CTX_init(&mctx); 2428 2429 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2430 p = ssl3_handshake_msg_start(s, SSL3_MT_CERTIFICATE_VERIFY); 2431 2432 /* 2433 * Create context from key and test if sha1 is allowed as 2434 * digest. 2435 */ 2436 pkey = s->cert->key->privatekey; 2437 pctx = EVP_PKEY_CTX_new(pkey, NULL); 2438 EVP_PKEY_sign_init(pctx); 2439 2440 /* XXX - is this needed? */ 2441 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1()) <= 0) 2442 ERR_clear_error(); 2443 2444 if (!SSL_USE_SIGALGS(s)) { 2445 if (S3I(s)->handshake_buffer) { 2446 if (!tls1_digest_cached_records(s)) 2447 goto err; 2448 } 2449 if (!tls1_handshake_hash_value(s, data, sizeof(data), 2450 NULL)) 2451 goto err; 2452 } 2453 2454 /* 2455 * For TLS v1.2 send signature algorithm and signature 2456 * using agreed digest and cached handshake records. 2457 */ 2458 if (SSL_USE_SIGALGS(s)) { 2459 long hdatalen = 0; 2460 void *hdata; 2461 const EVP_MD *md = s->cert->key->digest; 2462 hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer, 2463 &hdata); 2464 if (hdatalen <= 0 || 2465 !tls12_get_sigandhash(p, pkey, md)) { 2466 SSLerror(s, ERR_R_INTERNAL_ERROR); 2467 goto err; 2468 } 2469 p += 2; 2470 if (!EVP_SignInit_ex(&mctx, md, NULL) || 2471 !EVP_SignUpdate(&mctx, hdata, hdatalen) || 2472 !EVP_SignFinal(&mctx, p + 2, &u, pkey)) { 2473 SSLerror(s, ERR_R_EVP_LIB); 2474 goto err; 2475 } 2476 s2n(u, p); 2477 n = u + 4; 2478 if (!tls1_digest_cached_records(s)) 2479 goto err; 2480 } else if (pkey->type == EVP_PKEY_RSA) { 2481 if (RSA_sign(NID_md5_sha1, data, 2482 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, &(p[2]), 2483 &u, pkey->pkey.rsa) <= 0 ) { 2484 SSLerror(s, ERR_R_RSA_LIB); 2485 goto err; 2486 } 2487 s2n(u, p); 2488 n = u + 2; 2489 } else if (pkey->type == EVP_PKEY_EC) { 2490 if (!ECDSA_sign(pkey->save_type, 2491 &(data[MD5_DIGEST_LENGTH]), 2492 SHA_DIGEST_LENGTH, &(p[2]), 2493 (unsigned int *)&j, pkey->pkey.ec)) { 2494 SSLerror(s, ERR_R_ECDSA_LIB); 2495 goto err; 2496 } 2497 s2n(j, p); 2498 n = j + 2; 2499 #ifndef OPENSSL_NO_GOST 2500 } else if (pkey->type == NID_id_GostR3410_94 || 2501 pkey->type == NID_id_GostR3410_2001) { 2502 unsigned char signbuf[128]; 2503 long hdatalen = 0; 2504 void *hdata; 2505 const EVP_MD *md; 2506 int nid; 2507 size_t sigsize; 2508 2509 hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer, &hdata); 2510 if (hdatalen <= 0) { 2511 SSLerror(s, ERR_R_INTERNAL_ERROR); 2512 goto err; 2513 } 2514 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2515 !(md = EVP_get_digestbynid(nid))) { 2516 SSLerror(s, ERR_R_EVP_LIB); 2517 goto err; 2518 } 2519 if (!EVP_DigestInit_ex(&mctx, md, NULL) || 2520 !EVP_DigestUpdate(&mctx, hdata, hdatalen) || 2521 !EVP_DigestFinal(&mctx, signbuf, &u) || 2522 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) || 2523 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2524 EVP_PKEY_CTRL_GOST_SIG_FORMAT, 2525 GOST_SIG_FORMAT_RS_LE, 2526 NULL) <= 0) || 2527 (EVP_PKEY_sign(pctx, &(p[2]), &sigsize, 2528 signbuf, u) <= 0)) { 2529 SSLerror(s, ERR_R_EVP_LIB); 2530 goto err; 2531 } 2532 if (!tls1_digest_cached_records(s)) 2533 goto err; 2534 j = sigsize; 2535 s2n(j, p); 2536 n = j + 2; 2537 #endif 2538 } else { 2539 SSLerror(s, ERR_R_INTERNAL_ERROR); 2540 goto err; 2541 } 2542 2543 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2544 2545 ssl3_handshake_msg_finish(s, n); 2546 } 2547 2548 EVP_MD_CTX_cleanup(&mctx); 2549 EVP_PKEY_CTX_free(pctx); 2550 2551 return (ssl3_handshake_write(s)); 2552 2553 err: 2554 EVP_MD_CTX_cleanup(&mctx); 2555 EVP_PKEY_CTX_free(pctx); 2556 return (-1); 2557 } 2558 2559 int 2560 ssl3_send_client_certificate(SSL *s) 2561 { 2562 EVP_PKEY *pkey = NULL; 2563 X509 *x509 = NULL; 2564 CBB cbb, client_cert; 2565 int i; 2566 2567 memset(&cbb, 0, sizeof(cbb)); 2568 2569 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2570 if ((s->cert == NULL) || (s->cert->key->x509 == NULL) || 2571 (s->cert->key->privatekey == NULL)) 2572 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2573 else 2574 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2575 } 2576 2577 /* We need to get a client cert */ 2578 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2579 /* 2580 * If we get an error, we need to 2581 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 2582 * We then get retied later 2583 */ 2584 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2585 if (i < 0) { 2586 s->internal->rwstate = SSL_X509_LOOKUP; 2587 return (-1); 2588 } 2589 s->internal->rwstate = SSL_NOTHING; 2590 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2591 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2592 if (!SSL_use_certificate(s, x509) || 2593 !SSL_use_PrivateKey(s, pkey)) 2594 i = 0; 2595 } else if (i == 1) { 2596 i = 0; 2597 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2598 } 2599 2600 X509_free(x509); 2601 EVP_PKEY_free(pkey); 2602 if (i == 0) 2603 S3I(s)->tmp.cert_req = 2; 2604 2605 /* Ok, we have a cert */ 2606 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2607 } 2608 2609 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2610 if (!ssl3_handshake_msg_start_cbb(s, &cbb, &client_cert, 2611 SSL3_MT_CERTIFICATE)) 2612 goto err; 2613 if (!ssl3_output_cert_chain(s, &client_cert, 2614 (S3I(s)->tmp.cert_req == 2) ? NULL : s->cert->key->x509)) 2615 goto err; 2616 if (!ssl3_handshake_msg_finish_cbb(s, &cbb)) 2617 goto err; 2618 2619 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2620 } 2621 2622 /* SSL3_ST_CW_CERT_D */ 2623 return (ssl3_handshake_write(s)); 2624 2625 err: 2626 CBB_cleanup(&cbb); 2627 2628 return (0); 2629 } 2630 2631 #define has_bits(i,m) (((i)&(m)) == (m)) 2632 2633 int 2634 ssl3_check_cert_and_algorithm(SSL *s) 2635 { 2636 int i, idx; 2637 long alg_k, alg_a; 2638 EVP_PKEY *pkey = NULL; 2639 SESS_CERT *sc; 2640 DH *dh; 2641 2642 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2643 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 2644 2645 /* We don't have a certificate. */ 2646 if (alg_a & SSL_aNULL) 2647 return (1); 2648 2649 sc = SSI(s)->sess_cert; 2650 if (sc == NULL) { 2651 SSLerror(s, ERR_R_INTERNAL_ERROR); 2652 goto err; 2653 } 2654 dh = SSI(s)->sess_cert->peer_dh_tmp; 2655 2656 /* This is the passed certificate. */ 2657 2658 idx = sc->peer_cert_type; 2659 if (idx == SSL_PKEY_ECC) { 2660 if (ssl_check_srvr_ecc_cert_and_alg( 2661 sc->peer_pkeys[idx].x509, s) == 0) { 2662 /* check failed */ 2663 SSLerror(s, SSL_R_BAD_ECC_CERT); 2664 goto f_err; 2665 } else { 2666 return (1); 2667 } 2668 } 2669 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2670 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2671 EVP_PKEY_free(pkey); 2672 2673 /* Check that we have a certificate if we require one. */ 2674 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2675 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2676 goto f_err; 2677 } 2678 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2679 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2680 goto f_err; 2681 } 2682 if ((alg_k & SSL_kDHE) && 2683 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2684 SSLerror(s, SSL_R_MISSING_DH_KEY); 2685 goto f_err; 2686 } 2687 2688 return (1); 2689 f_err: 2690 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2691 err: 2692 return (0); 2693 } 2694 2695 /* 2696 * Check to see if handshake is full or resumed. Usually this is just a 2697 * case of checking to see if a cache hit has occurred. In the case of 2698 * session tickets we have to check the next message to be sure. 2699 */ 2700 2701 int 2702 ssl3_check_finished(SSL *s) 2703 { 2704 int ok; 2705 long n; 2706 2707 /* If we have no ticket it cannot be a resumed session. */ 2708 if (!s->session->tlsext_tick) 2709 return (1); 2710 /* this function is called when we really expect a Certificate 2711 * message, so permit appropriate message length */ 2712 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_A, 2713 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2714 if (!ok) 2715 return ((int)n); 2716 S3I(s)->tmp.reuse_message = 1; 2717 if ((S3I(s)->tmp.message_type == SSL3_MT_FINISHED) || 2718 (S3I(s)->tmp.message_type == SSL3_MT_NEWSESSION_TICKET)) 2719 return (2); 2720 2721 return (1); 2722 } 2723 2724 int 2725 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2726 { 2727 int i = 0; 2728 2729 #ifndef OPENSSL_NO_ENGINE 2730 if (s->ctx->internal->client_cert_engine) { 2731 i = ENGINE_load_ssl_client_cert( 2732 s->ctx->internal->client_cert_engine, s, 2733 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2734 if (i != 0) 2735 return (i); 2736 } 2737 #endif 2738 if (s->ctx->internal->client_cert_cb) 2739 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2740 return (i); 2741 } 2742