1 /* $OpenBSD: ssl_clnt.c,v 1.22 2017/10/12 16:06:32 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 char *p; 817 unsigned long alg_k; 818 size_t outlen; 819 int i, al, ok; 820 long n; 821 822 s->internal->first_packet = 1; 823 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 824 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, /* ?? */ &ok); 825 if (!ok) 826 return ((int)n); 827 s->internal->first_packet = 0; 828 829 if (n < 0) 830 goto truncated; 831 832 CBS_init(&cbs, s->internal->init_msg, n); 833 834 if (SSL_IS_DTLS(s)) { 835 if (S3I(s)->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 836 if (D1I(s)->send_cookie == 0) { 837 S3I(s)->tmp.reuse_message = 1; 838 return (1); 839 } else { 840 /* Already sent a cookie. */ 841 al = SSL_AD_UNEXPECTED_MESSAGE; 842 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 843 goto f_err; 844 } 845 } 846 } 847 848 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_HELLO) { 849 al = SSL_AD_UNEXPECTED_MESSAGE; 850 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 851 goto f_err; 852 } 853 854 if (!CBS_get_u16(&cbs, &server_version)) 855 goto truncated; 856 857 if (ssl_supported_version_range(s, &min_version, &max_version) != 1) { 858 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 859 goto err; 860 } 861 862 if (server_version < min_version || server_version > max_version) { 863 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 864 s->version = (s->version & 0xff00) | (server_version & 0xff); 865 al = SSL_AD_PROTOCOL_VERSION; 866 goto f_err; 867 } 868 s->version = server_version; 869 870 if ((method = tls1_get_client_method(server_version)) == NULL) 871 method = dtls1_get_client_method(server_version); 872 if (method == NULL) { 873 SSLerror(s, ERR_R_INTERNAL_ERROR); 874 goto err; 875 } 876 s->method = method; 877 878 /* Server random. */ 879 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 880 goto truncated; 881 if (!CBS_write_bytes(&server_random, s->s3->server_random, 882 sizeof(s->s3->server_random), NULL)) 883 goto err; 884 885 /* Session ID. */ 886 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 887 goto truncated; 888 889 if ((CBS_len(&session_id) > sizeof(s->session->session_id)) || 890 (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE)) { 891 al = SSL_AD_ILLEGAL_PARAMETER; 892 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 893 goto f_err; 894 } 895 896 /* Cipher suite. */ 897 if (!CBS_get_u16(&cbs, &cipher_suite)) 898 goto truncated; 899 900 /* 901 * Check if we want to resume the session based on external 902 * pre-shared secret. 903 */ 904 if (s->internal->tls_session_secret_cb) { 905 SSL_CIPHER *pref_cipher = NULL; 906 s->session->master_key_length = sizeof(s->session->master_key); 907 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 908 &s->session->master_key_length, NULL, &pref_cipher, 909 s->internal->tls_session_secret_cb_arg)) { 910 s->session->cipher = pref_cipher ? pref_cipher : 911 ssl3_get_cipher_by_value(cipher_suite); 912 s->s3->flags |= SSL3_FLAGS_CCS_OK; 913 } 914 } 915 916 if (s->session->session_id_length != 0 && 917 CBS_mem_equal(&session_id, s->session->session_id, 918 s->session->session_id_length)) { 919 if (s->sid_ctx_length != s->session->sid_ctx_length || 920 timingsafe_memcmp(s->session->sid_ctx, 921 s->sid_ctx, s->sid_ctx_length) != 0) { 922 /* actually a client application bug */ 923 al = SSL_AD_ILLEGAL_PARAMETER; 924 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 925 goto f_err; 926 } 927 s->s3->flags |= SSL3_FLAGS_CCS_OK; 928 s->internal->hit = 1; 929 } else { 930 /* a miss or crap from the other end */ 931 932 /* If we were trying for session-id reuse, make a new 933 * SSL_SESSION so we don't stuff up other people */ 934 s->internal->hit = 0; 935 if (s->session->session_id_length > 0) { 936 if (!ssl_get_new_session(s, 0)) { 937 al = SSL_AD_INTERNAL_ERROR; 938 goto f_err; 939 } 940 } 941 942 /* 943 * XXX - improve the handling for the case where there is a 944 * zero length session identifier. 945 */ 946 if (!CBS_write_bytes(&session_id, s->session->session_id, 947 sizeof(s->session->session_id), &outlen)) 948 goto err; 949 s->session->session_id_length = outlen; 950 951 s->session->ssl_version = s->version; 952 } 953 954 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 955 al = SSL_AD_ILLEGAL_PARAMETER; 956 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 957 goto f_err; 958 } 959 960 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 961 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 962 (TLS1_get_version(s) < TLS1_2_VERSION)) { 963 al = SSL_AD_ILLEGAL_PARAMETER; 964 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 965 goto f_err; 966 } 967 968 sk = ssl_get_ciphers_by_id(s); 969 i = sk_SSL_CIPHER_find(sk, cipher); 970 if (i < 0) { 971 /* we did not say we would use this cipher */ 972 al = SSL_AD_ILLEGAL_PARAMETER; 973 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 974 goto f_err; 975 } 976 977 /* 978 * Depending on the session caching (internal/external), the cipher 979 * and/or cipher_id values may not be set. Make sure that 980 * cipher_id is set and use it for comparison. 981 */ 982 if (s->session->cipher) 983 s->session->cipher_id = s->session->cipher->id; 984 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 985 al = SSL_AD_ILLEGAL_PARAMETER; 986 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 987 goto f_err; 988 } 989 S3I(s)->hs.new_cipher = cipher; 990 991 if (!tls1_handshake_hash_init(s)) 992 goto err; 993 994 /* 995 * Don't digest cached records if no sigalgs: we may need them for 996 * client authentication. 997 */ 998 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 999 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) && 1000 !tls1_digest_cached_records(s)) { 1001 al = SSL_AD_INTERNAL_ERROR; 1002 goto f_err; 1003 } 1004 1005 if (!CBS_get_u8(&cbs, &compression_method)) 1006 goto truncated; 1007 1008 if (compression_method != 0) { 1009 al = SSL_AD_ILLEGAL_PARAMETER; 1010 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1011 goto f_err; 1012 } 1013 1014 /* TLS extensions. */ 1015 p = (unsigned char *)CBS_data(&cbs); 1016 if (!ssl_parse_serverhello_tlsext(s, &p, CBS_len(&cbs), &al)) { 1017 /* 'al' set by ssl_parse_serverhello_tlsext */ 1018 SSLerror(s, SSL_R_PARSE_TLSEXT); 1019 goto f_err; 1020 } 1021 if (ssl_check_serverhello_tlsext(s) <= 0) { 1022 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1023 goto err; 1024 } 1025 1026 /* See if any data remains... */ 1027 if (p - CBS_data(&cbs) != CBS_len(&cbs)) 1028 goto truncated; 1029 1030 return (1); 1031 1032 truncated: 1033 /* wrong packet length */ 1034 al = SSL_AD_DECODE_ERROR; 1035 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1036 f_err: 1037 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1038 err: 1039 return (-1); 1040 } 1041 1042 int 1043 ssl3_get_server_certificate(SSL *s) 1044 { 1045 int al, i, ok, ret = -1; 1046 long n; 1047 CBS cbs, cert_list; 1048 X509 *x = NULL; 1049 const unsigned char *q; 1050 STACK_OF(X509) *sk = NULL; 1051 SESS_CERT *sc; 1052 EVP_PKEY *pkey = NULL; 1053 1054 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_A, 1055 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 1056 1057 if (!ok) 1058 return ((int)n); 1059 1060 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1061 S3I(s)->tmp.reuse_message = 1; 1062 return (1); 1063 } 1064 1065 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 1066 al = SSL_AD_UNEXPECTED_MESSAGE; 1067 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1068 goto f_err; 1069 } 1070 1071 1072 if ((sk = sk_X509_new_null()) == NULL) { 1073 SSLerror(s, ERR_R_MALLOC_FAILURE); 1074 goto err; 1075 } 1076 1077 if (n < 0) 1078 goto truncated; 1079 1080 CBS_init(&cbs, s->internal->init_msg, n); 1081 if (CBS_len(&cbs) < 3) 1082 goto truncated; 1083 1084 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1085 CBS_len(&cbs) != 0) { 1086 al = SSL_AD_DECODE_ERROR; 1087 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1088 goto f_err; 1089 } 1090 1091 while (CBS_len(&cert_list) > 0) { 1092 CBS cert; 1093 1094 if (CBS_len(&cert_list) < 3) 1095 goto truncated; 1096 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1097 al = SSL_AD_DECODE_ERROR; 1098 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1099 goto f_err; 1100 } 1101 1102 q = CBS_data(&cert); 1103 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1104 if (x == NULL) { 1105 al = SSL_AD_BAD_CERTIFICATE; 1106 SSLerror(s, ERR_R_ASN1_LIB); 1107 goto f_err; 1108 } 1109 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1110 al = SSL_AD_DECODE_ERROR; 1111 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1112 goto f_err; 1113 } 1114 if (!sk_X509_push(sk, x)) { 1115 SSLerror(s, ERR_R_MALLOC_FAILURE); 1116 goto err; 1117 } 1118 x = NULL; 1119 } 1120 1121 i = ssl_verify_cert_chain(s, sk); 1122 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1123 al = ssl_verify_alarm_type(s->verify_result); 1124 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1125 goto f_err; 1126 1127 } 1128 ERR_clear_error(); /* but we keep s->verify_result */ 1129 1130 sc = ssl_sess_cert_new(); 1131 if (sc == NULL) 1132 goto err; 1133 ssl_sess_cert_free(SSI(s)->sess_cert); 1134 SSI(s)->sess_cert = sc; 1135 1136 sc->cert_chain = sk; 1137 /* 1138 * Inconsistency alert: cert_chain does include the peer's 1139 * certificate, which we don't include in s3_srvr.c 1140 */ 1141 x = sk_X509_value(sk, 0); 1142 sk = NULL; 1143 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1144 1145 pkey = X509_get_pubkey(x); 1146 1147 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1148 x = NULL; 1149 al = SSL3_AL_FATAL; 1150 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1151 goto f_err; 1152 } 1153 1154 i = ssl_cert_type(x, pkey); 1155 if (i < 0) { 1156 x = NULL; 1157 al = SSL3_AL_FATAL; 1158 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1159 goto f_err; 1160 } 1161 1162 sc->peer_cert_type = i; 1163 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1164 /* 1165 * Why would the following ever happen? 1166 * We just created sc a couple of lines ago. 1167 */ 1168 X509_free(sc->peer_pkeys[i].x509); 1169 sc->peer_pkeys[i].x509 = x; 1170 sc->peer_key = &(sc->peer_pkeys[i]); 1171 1172 X509_free(s->session->peer); 1173 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1174 s->session->peer = x; 1175 s->session->verify_result = s->verify_result; 1176 1177 x = NULL; 1178 ret = 1; 1179 1180 if (0) { 1181 truncated: 1182 /* wrong packet length */ 1183 al = SSL_AD_DECODE_ERROR; 1184 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1185 f_err: 1186 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1187 } 1188 err: 1189 EVP_PKEY_free(pkey); 1190 X509_free(x); 1191 sk_X509_pop_free(sk, X509_free); 1192 1193 return (ret); 1194 } 1195 1196 static int 1197 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, unsigned char **pp, long *nn) 1198 { 1199 CBS cbs, dhp, dhg, dhpk; 1200 BN_CTX *bn_ctx = NULL; 1201 SESS_CERT *sc = NULL; 1202 DH *dh = NULL; 1203 long alg_a; 1204 int al; 1205 1206 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1207 sc = SSI(s)->sess_cert; 1208 1209 if (*nn < 0) 1210 goto err; 1211 1212 CBS_init(&cbs, *pp, *nn); 1213 1214 if ((dh = DH_new()) == NULL) { 1215 SSLerror(s, ERR_R_DH_LIB); 1216 goto err; 1217 } 1218 1219 if (!CBS_get_u16_length_prefixed(&cbs, &dhp)) 1220 goto truncated; 1221 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1222 SSLerror(s, ERR_R_BN_LIB); 1223 goto err; 1224 } 1225 1226 if (!CBS_get_u16_length_prefixed(&cbs, &dhg)) 1227 goto truncated; 1228 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1229 SSLerror(s, ERR_R_BN_LIB); 1230 goto err; 1231 } 1232 1233 if (!CBS_get_u16_length_prefixed(&cbs, &dhpk)) 1234 goto truncated; 1235 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1236 NULL)) == NULL) { 1237 SSLerror(s, ERR_R_BN_LIB); 1238 goto err; 1239 } 1240 1241 /* 1242 * Check the strength of the DH key just constructed. 1243 * Discard keys weaker than 1024 bits. 1244 */ 1245 if (DH_size(dh) < 1024 / 8) { 1246 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1247 goto err; 1248 } 1249 1250 if (alg_a & SSL_aRSA) 1251 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1252 else 1253 /* XXX - Anonymous DH, so no certificate or pkey. */ 1254 *pkey = NULL; 1255 1256 sc->peer_dh_tmp = dh; 1257 1258 *nn = CBS_len(&cbs); 1259 *pp = (unsigned char *)CBS_data(&cbs); 1260 1261 return (1); 1262 1263 truncated: 1264 al = SSL_AD_DECODE_ERROR; 1265 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1266 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1267 1268 err: 1269 DH_free(dh); 1270 BN_CTX_free(bn_ctx); 1271 1272 return (-1); 1273 } 1274 1275 static int 1276 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1277 { 1278 const EC_GROUP *group; 1279 EC_GROUP *ngroup = NULL; 1280 EC_POINT *point = NULL; 1281 BN_CTX *bn_ctx = NULL; 1282 EC_KEY *ecdh = NULL; 1283 int ret = -1; 1284 1285 /* 1286 * Extract the server's ephemeral ECDH public key. 1287 */ 1288 1289 if ((ecdh = EC_KEY_new()) == NULL) { 1290 SSLerror(s, ERR_R_MALLOC_FAILURE); 1291 goto err; 1292 } 1293 1294 if ((ngroup = EC_GROUP_new_by_curve_name(nid)) == NULL) { 1295 SSLerror(s, ERR_R_EC_LIB); 1296 goto err; 1297 } 1298 if (EC_KEY_set_group(ecdh, ngroup) == 0) { 1299 SSLerror(s, ERR_R_EC_LIB); 1300 goto err; 1301 } 1302 1303 group = EC_KEY_get0_group(ecdh); 1304 1305 if ((point = EC_POINT_new(group)) == NULL || 1306 (bn_ctx = BN_CTX_new()) == NULL) { 1307 SSLerror(s, ERR_R_MALLOC_FAILURE); 1308 goto err; 1309 } 1310 1311 if (EC_POINT_oct2point(group, point, CBS_data(public), 1312 CBS_len(public), bn_ctx) == 0) { 1313 SSLerror(s, SSL_R_BAD_ECPOINT); 1314 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1315 goto err; 1316 } 1317 1318 EC_KEY_set_public_key(ecdh, point); 1319 sc->peer_ecdh_tmp = ecdh; 1320 ecdh = NULL; 1321 1322 ret = 1; 1323 1324 err: 1325 BN_CTX_free(bn_ctx); 1326 EC_GROUP_free(ngroup); 1327 EC_POINT_free(point); 1328 EC_KEY_free(ecdh); 1329 1330 return (ret); 1331 } 1332 1333 static int 1334 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1335 { 1336 size_t outlen; 1337 1338 if (nid != NID_X25519) { 1339 SSLerror(s, ERR_R_INTERNAL_ERROR); 1340 goto err; 1341 } 1342 1343 if (CBS_len(public) != X25519_KEY_LENGTH) { 1344 SSLerror(s, SSL_R_BAD_ECPOINT); 1345 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1346 goto err; 1347 } 1348 1349 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1350 SSLerror(s, ERR_R_MALLOC_FAILURE); 1351 goto err; 1352 } 1353 1354 return (1); 1355 1356 err: 1357 return (-1); 1358 } 1359 1360 static int 1361 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, unsigned char **pp, long *nn) 1362 { 1363 CBS cbs, public; 1364 uint8_t curve_type; 1365 uint16_t curve_id; 1366 SESS_CERT *sc; 1367 long alg_a; 1368 int nid; 1369 int al; 1370 1371 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1372 sc = SSI(s)->sess_cert; 1373 1374 if (*nn < 0) 1375 goto err; 1376 1377 CBS_init(&cbs, *pp, *nn); 1378 1379 /* Only named curves are supported. */ 1380 if (!CBS_get_u8(&cbs, &curve_type) || 1381 curve_type != NAMED_CURVE_TYPE || 1382 !CBS_get_u16(&cbs, &curve_id)) { 1383 al = SSL_AD_DECODE_ERROR; 1384 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1385 goto f_err; 1386 } 1387 1388 /* 1389 * Check that the curve is one of our preferences - if it is not, 1390 * the server has sent us an invalid curve. 1391 */ 1392 if (tls1_check_curve(s, curve_id) != 1) { 1393 al = SSL_AD_DECODE_ERROR; 1394 SSLerror(s, SSL_R_WRONG_CURVE); 1395 goto f_err; 1396 } 1397 1398 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1399 al = SSL_AD_INTERNAL_ERROR; 1400 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1401 goto f_err; 1402 } 1403 1404 if (!CBS_get_u8_length_prefixed(&cbs, &public)) 1405 goto truncated; 1406 1407 if (nid == NID_X25519) { 1408 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1409 goto err; 1410 } else { 1411 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1412 goto err; 1413 } 1414 1415 /* 1416 * The ECC/TLS specification does not mention the use of DSA to sign 1417 * ECParameters in the server key exchange message. We do support RSA 1418 * and ECDSA. 1419 */ 1420 if (alg_a & SSL_aRSA) 1421 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1422 else if (alg_a & SSL_aECDSA) 1423 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1424 else 1425 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1426 *pkey = NULL; 1427 1428 *nn = CBS_len(&cbs); 1429 *pp = (unsigned char *)CBS_data(&cbs); 1430 1431 return (1); 1432 1433 truncated: 1434 al = SSL_AD_DECODE_ERROR; 1435 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1436 1437 f_err: 1438 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1439 1440 err: 1441 return (-1); 1442 } 1443 1444 int 1445 ssl3_get_server_key_exchange(SSL *s) 1446 { 1447 unsigned char *q, md_buf[EVP_MAX_MD_SIZE*2]; 1448 EVP_MD_CTX md_ctx; 1449 unsigned char *param, *p; 1450 int al, i, j, param_len, ok; 1451 long n, alg_k, alg_a; 1452 EVP_PKEY *pkey = NULL; 1453 const EVP_MD *md = NULL; 1454 RSA *rsa = NULL; 1455 1456 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1457 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1458 1459 /* 1460 * Use same message size as in ssl3_get_certificate_request() 1461 * as ServerKeyExchange message may be skipped. 1462 */ 1463 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1464 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1465 if (!ok) 1466 return ((int)n); 1467 1468 EVP_MD_CTX_init(&md_ctx); 1469 1470 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1471 /* 1472 * Do not skip server key exchange if this cipher suite uses 1473 * ephemeral keys. 1474 */ 1475 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1476 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1477 al = SSL_AD_UNEXPECTED_MESSAGE; 1478 goto f_err; 1479 } 1480 1481 S3I(s)->tmp.reuse_message = 1; 1482 EVP_MD_CTX_cleanup(&md_ctx); 1483 return (1); 1484 } 1485 1486 if (SSI(s)->sess_cert != NULL) { 1487 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1488 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1489 1490 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1491 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1492 1493 free(SSI(s)->sess_cert->peer_x25519_tmp); 1494 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1495 } else { 1496 SSI(s)->sess_cert = ssl_sess_cert_new(); 1497 if (SSI(s)->sess_cert == NULL) 1498 goto err; 1499 } 1500 1501 param = p = (unsigned char *)s->internal->init_msg; 1502 param_len = n; 1503 1504 if (alg_k & SSL_kDHE) { 1505 if (ssl3_get_server_kex_dhe(s, &pkey, &p, &n) != 1) 1506 goto err; 1507 } else if (alg_k & SSL_kECDHE) { 1508 if (ssl3_get_server_kex_ecdhe(s, &pkey, &p, &n) != 1) 1509 goto err; 1510 } else if (alg_k != 0) { 1511 al = SSL_AD_UNEXPECTED_MESSAGE; 1512 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1513 goto f_err; 1514 } 1515 1516 param_len = param_len - n; 1517 1518 /* if it was signed, check the signature */ 1519 if (pkey != NULL) { 1520 if (SSL_USE_SIGALGS(s)) { 1521 int sigalg = tls12_get_sigid(pkey); 1522 /* Should never happen */ 1523 if (sigalg == -1) { 1524 SSLerror(s, ERR_R_INTERNAL_ERROR); 1525 goto err; 1526 } 1527 /* 1528 * Check key type is consistent 1529 * with signature 1530 */ 1531 if (2 > n) 1532 goto truncated; 1533 if (sigalg != (int)p[1]) { 1534 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 1535 al = SSL_AD_DECODE_ERROR; 1536 goto f_err; 1537 } 1538 md = tls12_get_hash(p[0]); 1539 if (md == NULL) { 1540 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1541 al = SSL_AD_DECODE_ERROR; 1542 goto f_err; 1543 } 1544 p += 2; 1545 n -= 2; 1546 } else 1547 md = EVP_sha1(); 1548 1549 if (2 > n) 1550 goto truncated; 1551 n2s(p, i); 1552 n -= 2; 1553 j = EVP_PKEY_size(pkey); 1554 1555 if (i != n || n > j) { 1556 /* wrong packet length */ 1557 al = SSL_AD_DECODE_ERROR; 1558 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1559 goto f_err; 1560 } 1561 1562 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) { 1563 j = 0; 1564 q = md_buf; 1565 if (!EVP_DigestInit_ex(&md_ctx, EVP_md5_sha1(), NULL)) { 1566 al = SSL_AD_INTERNAL_ERROR; 1567 goto f_err; 1568 } 1569 EVP_DigestUpdate(&md_ctx, s->s3->client_random, 1570 SSL3_RANDOM_SIZE); 1571 EVP_DigestUpdate(&md_ctx, s->s3->server_random, 1572 SSL3_RANDOM_SIZE); 1573 EVP_DigestUpdate(&md_ctx, param, param_len); 1574 EVP_DigestFinal_ex(&md_ctx, q, (unsigned int *)&i); 1575 q += i; 1576 j += i; 1577 i = RSA_verify(NID_md5_sha1, md_buf, j, 1578 p, n, pkey->pkey.rsa); 1579 if (i < 0) { 1580 al = SSL_AD_DECRYPT_ERROR; 1581 SSLerror(s, SSL_R_BAD_RSA_DECRYPT); 1582 goto f_err; 1583 } 1584 if (i == 0) { 1585 /* bad signature */ 1586 al = SSL_AD_DECRYPT_ERROR; 1587 SSLerror(s, SSL_R_BAD_SIGNATURE); 1588 goto f_err; 1589 } 1590 } else { 1591 EVP_VerifyInit_ex(&md_ctx, md, NULL); 1592 EVP_VerifyUpdate(&md_ctx, s->s3->client_random, 1593 SSL3_RANDOM_SIZE); 1594 EVP_VerifyUpdate(&md_ctx, s->s3->server_random, 1595 SSL3_RANDOM_SIZE); 1596 EVP_VerifyUpdate(&md_ctx, param, param_len); 1597 if (EVP_VerifyFinal(&md_ctx, p,(int)n, pkey) <= 0) { 1598 /* bad signature */ 1599 al = SSL_AD_DECRYPT_ERROR; 1600 SSLerror(s, SSL_R_BAD_SIGNATURE); 1601 goto f_err; 1602 } 1603 } 1604 } else { 1605 /* aNULL does not need public keys. */ 1606 if (!(alg_a & SSL_aNULL)) { 1607 SSLerror(s, ERR_R_INTERNAL_ERROR); 1608 goto err; 1609 } 1610 /* still data left over */ 1611 if (n != 0) { 1612 al = SSL_AD_DECODE_ERROR; 1613 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1614 goto f_err; 1615 } 1616 } 1617 1618 EVP_PKEY_free(pkey); 1619 EVP_MD_CTX_cleanup(&md_ctx); 1620 1621 return (1); 1622 1623 truncated: 1624 /* wrong packet length */ 1625 al = SSL_AD_DECODE_ERROR; 1626 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1627 1628 f_err: 1629 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1630 1631 err: 1632 EVP_PKEY_free(pkey); 1633 RSA_free(rsa); 1634 EVP_MD_CTX_cleanup(&md_ctx); 1635 1636 return (-1); 1637 } 1638 1639 int 1640 ssl3_get_certificate_request(SSL *s) 1641 { 1642 int ok, ret = 0; 1643 long n; 1644 uint8_t ctype_num; 1645 CBS cert_request, ctypes, rdn_list; 1646 X509_NAME *xn = NULL; 1647 const unsigned char *q; 1648 STACK_OF(X509_NAME) *ca_sk = NULL; 1649 1650 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1651 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1652 1653 if (!ok) 1654 return ((int)n); 1655 1656 S3I(s)->tmp.cert_req = 0; 1657 1658 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_DONE) { 1659 S3I(s)->tmp.reuse_message = 1; 1660 /* 1661 * If we get here we don't need any cached handshake records 1662 * as we wont be doing client auth. 1663 */ 1664 if (S3I(s)->handshake_buffer) { 1665 if (!tls1_digest_cached_records(s)) 1666 goto err; 1667 } 1668 return (1); 1669 } 1670 1671 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1672 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1673 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1674 goto err; 1675 } 1676 1677 /* TLS does not like anon-DH with client cert */ 1678 if (S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL) { 1679 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1680 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1681 goto err; 1682 } 1683 1684 if (n < 0) 1685 goto truncated; 1686 CBS_init(&cert_request, s->internal->init_msg, n); 1687 1688 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1689 SSLerror(s, ERR_R_MALLOC_FAILURE); 1690 goto err; 1691 } 1692 1693 /* get the certificate types */ 1694 if (!CBS_get_u8(&cert_request, &ctype_num)) 1695 goto truncated; 1696 1697 if (ctype_num > SSL3_CT_NUMBER) 1698 ctype_num = SSL3_CT_NUMBER; 1699 if (!CBS_get_bytes(&cert_request, &ctypes, ctype_num) || 1700 !CBS_write_bytes(&ctypes, (uint8_t *)S3I(s)->tmp.ctype, 1701 sizeof(S3I(s)->tmp.ctype), NULL)) { 1702 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1703 goto err; 1704 } 1705 1706 if (SSL_USE_SIGALGS(s)) { 1707 CBS sigalgs; 1708 1709 if (CBS_len(&cert_request) < 2) { 1710 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1711 goto err; 1712 } 1713 1714 /* Check we have enough room for signature algorithms and 1715 * following length value. 1716 */ 1717 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1718 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1719 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1720 goto err; 1721 } 1722 if (!tls1_process_sigalgs(s, &sigalgs)) { 1723 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1724 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1725 goto err; 1726 } 1727 } 1728 1729 /* get the CA RDNs */ 1730 if (CBS_len(&cert_request) < 2) { 1731 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1732 goto err; 1733 } 1734 1735 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1736 CBS_len(&cert_request) != 0) { 1737 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1738 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1739 goto err; 1740 } 1741 1742 while (CBS_len(&rdn_list) > 0) { 1743 CBS rdn; 1744 1745 if (CBS_len(&rdn_list) < 2) { 1746 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1747 goto err; 1748 } 1749 1750 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1751 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1752 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1753 goto err; 1754 } 1755 1756 q = CBS_data(&rdn); 1757 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1758 ssl3_send_alert(s, SSL3_AL_FATAL, 1759 SSL_AD_DECODE_ERROR); 1760 SSLerror(s, ERR_R_ASN1_LIB); 1761 goto err; 1762 } 1763 1764 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1765 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1766 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1767 goto err; 1768 } 1769 if (!sk_X509_NAME_push(ca_sk, xn)) { 1770 SSLerror(s, ERR_R_MALLOC_FAILURE); 1771 goto err; 1772 } 1773 xn = NULL; /* avoid free in err block */ 1774 } 1775 1776 /* we should setup a certificate to return.... */ 1777 S3I(s)->tmp.cert_req = 1; 1778 S3I(s)->tmp.ctype_num = ctype_num; 1779 sk_X509_NAME_pop_free(S3I(s)->tmp.ca_names, X509_NAME_free); 1780 S3I(s)->tmp.ca_names = ca_sk; 1781 ca_sk = NULL; 1782 1783 ret = 1; 1784 if (0) { 1785 truncated: 1786 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1787 } 1788 err: 1789 X509_NAME_free(xn); 1790 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1791 return (ret); 1792 } 1793 1794 static int 1795 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1796 { 1797 return (X509_NAME_cmp(*a, *b)); 1798 } 1799 1800 int 1801 ssl3_get_new_session_ticket(SSL *s) 1802 { 1803 int ok, al, ret = 0; 1804 uint32_t lifetime_hint; 1805 long n; 1806 CBS cbs, session_ticket; 1807 1808 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1809 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1810 if (!ok) 1811 return ((int)n); 1812 1813 if (S3I(s)->tmp.message_type == SSL3_MT_FINISHED) { 1814 S3I(s)->tmp.reuse_message = 1; 1815 return (1); 1816 } 1817 if (S3I(s)->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) { 1818 al = SSL_AD_UNEXPECTED_MESSAGE; 1819 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1820 goto f_err; 1821 } 1822 1823 if (n < 0) { 1824 al = SSL_AD_DECODE_ERROR; 1825 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1826 goto f_err; 1827 } 1828 1829 CBS_init(&cbs, s->internal->init_msg, n); 1830 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1831 #if UINT32_MAX > LONG_MAX 1832 lifetime_hint > LONG_MAX || 1833 #endif 1834 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1835 CBS_len(&cbs) != 0) { 1836 al = SSL_AD_DECODE_ERROR; 1837 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1838 goto f_err; 1839 } 1840 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1841 1842 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1843 &s->session->tlsext_ticklen)) { 1844 SSLerror(s, ERR_R_MALLOC_FAILURE); 1845 goto err; 1846 } 1847 1848 /* 1849 * There are two ways to detect a resumed ticket sesion. 1850 * One is to set an appropriate session ID and then the server 1851 * must return a match in ServerHello. This allows the normal 1852 * client session ID matching to work and we know much 1853 * earlier that the ticket has been accepted. 1854 * 1855 * The other way is to set zero length session ID when the 1856 * ticket is presented and rely on the handshake to determine 1857 * session resumption. 1858 * 1859 * We choose the former approach because this fits in with 1860 * assumptions elsewhere in OpenSSL. The session ID is set 1861 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1862 * ticket. 1863 */ 1864 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1865 s->session->session_id, &s->session->session_id_length, 1866 EVP_sha256(), NULL); 1867 ret = 1; 1868 return (ret); 1869 f_err: 1870 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1871 err: 1872 return (-1); 1873 } 1874 1875 int 1876 ssl3_get_cert_status(SSL *s) 1877 { 1878 CBS cert_status, response; 1879 size_t stow_len; 1880 int ok, al; 1881 long n; 1882 uint8_t status_type; 1883 1884 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1885 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 1886 16384, &ok); 1887 1888 if (!ok) 1889 return ((int)n); 1890 1891 if (n < 0) { 1892 /* need at least status type + length */ 1893 al = SSL_AD_DECODE_ERROR; 1894 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1895 goto f_err; 1896 } 1897 1898 CBS_init(&cert_status, s->internal->init_msg, n); 1899 if (!CBS_get_u8(&cert_status, &status_type) || 1900 CBS_len(&cert_status) < 3) { 1901 /* need at least status type + length */ 1902 al = SSL_AD_DECODE_ERROR; 1903 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1904 goto f_err; 1905 } 1906 1907 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1908 al = SSL_AD_DECODE_ERROR; 1909 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1910 goto f_err; 1911 } 1912 1913 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1914 CBS_len(&cert_status) != 0) { 1915 al = SSL_AD_DECODE_ERROR; 1916 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1917 goto f_err; 1918 } 1919 1920 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1921 &stow_len) || stow_len > INT_MAX) { 1922 s->internal->tlsext_ocsp_resplen = 0; 1923 al = SSL_AD_INTERNAL_ERROR; 1924 SSLerror(s, ERR_R_MALLOC_FAILURE); 1925 goto f_err; 1926 } 1927 s->internal->tlsext_ocsp_resplen = (int)stow_len; 1928 1929 if (s->ctx->internal->tlsext_status_cb) { 1930 int ret; 1931 ret = s->ctx->internal->tlsext_status_cb(s, 1932 s->ctx->internal->tlsext_status_arg); 1933 if (ret == 0) { 1934 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1935 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1936 goto f_err; 1937 } 1938 if (ret < 0) { 1939 al = SSL_AD_INTERNAL_ERROR; 1940 SSLerror(s, ERR_R_MALLOC_FAILURE); 1941 goto f_err; 1942 } 1943 } 1944 return (1); 1945 f_err: 1946 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1947 return (-1); 1948 } 1949 1950 int 1951 ssl3_get_server_done(SSL *s) 1952 { 1953 int ok, ret = 0; 1954 long n; 1955 1956 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1957 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1958 30, /* should be very small, like 0 :-) */ &ok); 1959 1960 if (!ok) 1961 return ((int)n); 1962 if (n > 0) { 1963 /* should contain no data */ 1964 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1965 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1966 return (-1); 1967 } 1968 ret = 1; 1969 return (ret); 1970 } 1971 1972 static int 1973 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1974 { 1975 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1976 unsigned char *enc_pms = NULL; 1977 EVP_PKEY *pkey = NULL; 1978 int ret = -1; 1979 int enc_len; 1980 CBB epms; 1981 1982 /* 1983 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1984 */ 1985 1986 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1987 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1988 pkey->pkey.rsa == NULL) { 1989 SSLerror(s, ERR_R_INTERNAL_ERROR); 1990 goto err; 1991 } 1992 1993 pms[0] = s->client_version >> 8; 1994 pms[1] = s->client_version & 0xff; 1995 arc4random_buf(&pms[2], sizeof(pms) - 2); 1996 1997 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1998 SSLerror(s, ERR_R_MALLOC_FAILURE); 1999 goto err; 2000 } 2001 2002 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 2003 RSA_PKCS1_PADDING); 2004 if (enc_len <= 0) { 2005 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 2006 goto err; 2007 } 2008 2009 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 2010 goto err; 2011 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 2012 goto err; 2013 if (!CBB_flush(cbb)) 2014 goto err; 2015 2016 s->session->master_key_length = 2017 tls1_generate_master_secret(s, 2018 s->session->master_key, pms, sizeof(pms)); 2019 2020 ret = 1; 2021 2022 err: 2023 explicit_bzero(pms, sizeof(pms)); 2024 EVP_PKEY_free(pkey); 2025 free(enc_pms); 2026 2027 return (ret); 2028 } 2029 2030 static int 2031 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2032 { 2033 DH *dh_srvr = NULL, *dh_clnt = NULL; 2034 unsigned char *key = NULL; 2035 int key_size = 0, key_len; 2036 unsigned char *data; 2037 int ret = -1; 2038 CBB dh_Yc; 2039 2040 /* Ensure that we have an ephemeral key for DHE. */ 2041 if (sess_cert->peer_dh_tmp == NULL) { 2042 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2043 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 2044 goto err; 2045 } 2046 dh_srvr = sess_cert->peer_dh_tmp; 2047 2048 /* Generate a new random key. */ 2049 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2050 SSLerror(s, ERR_R_DH_LIB); 2051 goto err; 2052 } 2053 if (!DH_generate_key(dh_clnt)) { 2054 SSLerror(s, ERR_R_DH_LIB); 2055 goto err; 2056 } 2057 key_size = DH_size(dh_clnt); 2058 if ((key = malloc(key_size)) == NULL) { 2059 SSLerror(s, ERR_R_MALLOC_FAILURE); 2060 goto err; 2061 } 2062 key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt); 2063 if (key_len <= 0) { 2064 SSLerror(s, ERR_R_DH_LIB); 2065 goto err; 2066 } 2067 2068 /* Generate master key from the result. */ 2069 s->session->master_key_length = 2070 tls1_generate_master_secret(s, 2071 s->session->master_key, key, key_len); 2072 2073 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2074 goto err; 2075 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2076 goto err; 2077 BN_bn2bin(dh_clnt->pub_key, data); 2078 if (!CBB_flush(cbb)) 2079 goto err; 2080 2081 ret = 1; 2082 2083 err: 2084 DH_free(dh_clnt); 2085 freezero(key, key_size); 2086 2087 return (ret); 2088 } 2089 2090 static int 2091 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2092 { 2093 const EC_GROUP *group = NULL; 2094 const EC_POINT *point = NULL; 2095 EC_KEY *ecdh = NULL; 2096 BN_CTX *bn_ctx = NULL; 2097 unsigned char *key = NULL; 2098 unsigned char *data; 2099 size_t encoded_len; 2100 int key_size = 0, key_len; 2101 int ret = -1; 2102 CBB ecpoint; 2103 2104 if ((group = EC_KEY_get0_group(sc->peer_ecdh_tmp)) == NULL || 2105 (point = EC_KEY_get0_public_key(sc->peer_ecdh_tmp)) == NULL) { 2106 SSLerror(s, ERR_R_INTERNAL_ERROR); 2107 goto err; 2108 } 2109 2110 if ((ecdh = EC_KEY_new()) == NULL) { 2111 SSLerror(s, ERR_R_MALLOC_FAILURE); 2112 goto err; 2113 } 2114 2115 if (!EC_KEY_set_group(ecdh, group)) { 2116 SSLerror(s, ERR_R_EC_LIB); 2117 goto err; 2118 } 2119 2120 /* Generate a new ECDH key pair. */ 2121 if (!(EC_KEY_generate_key(ecdh))) { 2122 SSLerror(s, ERR_R_ECDH_LIB); 2123 goto err; 2124 } 2125 if ((key_size = ECDH_size(ecdh)) <= 0) { 2126 SSLerror(s, ERR_R_ECDH_LIB); 2127 goto err; 2128 } 2129 if ((key = malloc(key_size)) == NULL) { 2130 SSLerror(s, ERR_R_MALLOC_FAILURE); 2131 } 2132 key_len = ECDH_compute_key(key, key_size, point, ecdh, NULL); 2133 if (key_len <= 0) { 2134 SSLerror(s, ERR_R_ECDH_LIB); 2135 goto err; 2136 } 2137 2138 /* Generate master key from the result. */ 2139 s->session->master_key_length = 2140 tls1_generate_master_secret(s, 2141 s->session->master_key, key, key_len); 2142 2143 encoded_len = EC_POINT_point2oct(group, EC_KEY_get0_public_key(ecdh), 2144 POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL); 2145 if (encoded_len == 0) { 2146 SSLerror(s, ERR_R_ECDH_LIB); 2147 goto err; 2148 } 2149 2150 if ((bn_ctx = BN_CTX_new()) == NULL) { 2151 SSLerror(s, ERR_R_MALLOC_FAILURE); 2152 goto err; 2153 } 2154 2155 /* Encode the public key. */ 2156 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2157 goto err; 2158 if (!CBB_add_space(&ecpoint, &data, encoded_len)) 2159 goto err; 2160 if (EC_POINT_point2oct(group, EC_KEY_get0_public_key(ecdh), 2161 POINT_CONVERSION_UNCOMPRESSED, data, encoded_len, 2162 bn_ctx) == 0) 2163 goto err; 2164 if (!CBB_flush(cbb)) 2165 goto err; 2166 2167 ret = 1; 2168 2169 err: 2170 freezero(key, key_size); 2171 2172 BN_CTX_free(bn_ctx); 2173 EC_KEY_free(ecdh); 2174 2175 return (ret); 2176 } 2177 2178 static int 2179 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2180 { 2181 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2182 int ret = -1; 2183 CBB ecpoint; 2184 2185 /* Generate X25519 key pair and derive shared key. */ 2186 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2187 goto err; 2188 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2189 goto err; 2190 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2191 goto err; 2192 X25519_keypair(public_key, private_key); 2193 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2194 goto err; 2195 2196 /* Serialize the public key. */ 2197 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2198 goto err; 2199 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2200 goto err; 2201 if (!CBB_flush(cbb)) 2202 goto err; 2203 2204 /* Generate master key from the result. */ 2205 s->session->master_key_length = 2206 tls1_generate_master_secret(s, 2207 s->session->master_key, shared_key, X25519_KEY_LENGTH); 2208 2209 ret = 1; 2210 2211 err: 2212 free(public_key); 2213 freezero(private_key, X25519_KEY_LENGTH); 2214 freezero(shared_key, X25519_KEY_LENGTH); 2215 2216 return (ret); 2217 } 2218 2219 static int 2220 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2221 { 2222 if (sc->peer_x25519_tmp != NULL) { 2223 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2224 goto err; 2225 } else if (sc->peer_ecdh_tmp != NULL) { 2226 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2227 goto err; 2228 } else { 2229 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2230 SSLerror(s, ERR_R_INTERNAL_ERROR); 2231 goto err; 2232 } 2233 2234 return (1); 2235 2236 err: 2237 return (-1); 2238 } 2239 2240 static int 2241 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2242 { 2243 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2244 EVP_PKEY *pub_key = NULL; 2245 EVP_PKEY_CTX *pkey_ctx; 2246 X509 *peer_cert; 2247 size_t msglen; 2248 unsigned int md_len; 2249 EVP_MD_CTX *ukm_hash; 2250 int ret = -1; 2251 int nid; 2252 CBB gostblob; 2253 2254 /* Get server sertificate PKEY and create ctx from it */ 2255 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2256 if (peer_cert == NULL) { 2257 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2258 goto err; 2259 } 2260 2261 pub_key = X509_get_pubkey(peer_cert); 2262 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2263 2264 /* 2265 * If we have send a certificate, and certificate key parameters match 2266 * those of server certificate, use certificate key for key exchange. 2267 * Otherwise, generate ephemeral key pair. 2268 */ 2269 EVP_PKEY_encrypt_init(pkey_ctx); 2270 2271 /* Generate session key. */ 2272 arc4random_buf(premaster_secret, 32); 2273 2274 /* 2275 * If we have client certificate, use its secret as peer key. 2276 */ 2277 if (S3I(s)->tmp.cert_req && s->cert->key->privatekey) { 2278 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2279 s->cert->key->privatekey) <=0) { 2280 /* 2281 * If there was an error - just ignore it. 2282 * Ephemeral key would be used. 2283 */ 2284 ERR_clear_error(); 2285 } 2286 } 2287 2288 /* 2289 * Compute shared IV and store it in algorithm-specific context data. 2290 */ 2291 ukm_hash = EVP_MD_CTX_create(); 2292 if (ukm_hash == NULL) { 2293 SSLerror(s, ERR_R_MALLOC_FAILURE); 2294 goto err; 2295 } 2296 2297 if (ssl_get_algorithm2(s) & SSL_HANDSHAKE_MAC_GOST94) 2298 nid = NID_id_GostR3411_94; 2299 else 2300 nid = NID_id_tc26_gost3411_2012_256; 2301 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2302 goto err; 2303 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2304 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2305 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2306 EVP_MD_CTX_destroy(ukm_hash); 2307 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2308 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2309 SSLerror(s, SSL_R_LIBRARY_BUG); 2310 goto err; 2311 } 2312 2313 /* 2314 * Make GOST keytransport blob message, encapsulate it into sequence. 2315 */ 2316 msglen = 255; 2317 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2318 32) < 0) { 2319 SSLerror(s, SSL_R_LIBRARY_BUG); 2320 goto err; 2321 } 2322 2323 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2324 goto err; 2325 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2326 goto err; 2327 if (!CBB_flush(cbb)) 2328 goto err; 2329 2330 /* Check if pubkey from client certificate was used. */ 2331 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2332 NULL) > 0) { 2333 /* Set flag "skip certificate verify". */ 2334 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2335 } 2336 EVP_PKEY_CTX_free(pkey_ctx); 2337 s->session->master_key_length = 2338 tls1_generate_master_secret(s, 2339 s->session->master_key, premaster_secret, 32); 2340 2341 ret = 1; 2342 2343 err: 2344 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2345 EVP_PKEY_free(pub_key); 2346 2347 return (ret); 2348 } 2349 2350 int 2351 ssl3_send_client_key_exchange(SSL *s) 2352 { 2353 SESS_CERT *sess_cert; 2354 unsigned long alg_k; 2355 CBB cbb, kex; 2356 2357 memset(&cbb, 0, sizeof(cbb)); 2358 2359 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2360 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2361 2362 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2363 ssl3_send_alert(s, SSL3_AL_FATAL, 2364 SSL_AD_UNEXPECTED_MESSAGE); 2365 SSLerror(s, ERR_R_INTERNAL_ERROR); 2366 goto err; 2367 } 2368 2369 if (!ssl3_handshake_msg_start_cbb(s, &cbb, &kex, 2370 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2371 goto err; 2372 2373 if (alg_k & SSL_kRSA) { 2374 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2375 goto err; 2376 } else if (alg_k & SSL_kDHE) { 2377 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2378 goto err; 2379 } else if (alg_k & SSL_kECDHE) { 2380 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2381 goto err; 2382 } else if (alg_k & SSL_kGOST) { 2383 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2384 goto err; 2385 } else { 2386 ssl3_send_alert(s, SSL3_AL_FATAL, 2387 SSL_AD_HANDSHAKE_FAILURE); 2388 SSLerror(s, ERR_R_INTERNAL_ERROR); 2389 goto err; 2390 } 2391 2392 if (!ssl3_handshake_msg_finish_cbb(s, &cbb)) 2393 goto err; 2394 2395 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2396 } 2397 2398 /* SSL3_ST_CW_KEY_EXCH_B */ 2399 return (ssl3_handshake_write(s)); 2400 2401 err: 2402 CBB_cleanup(&cbb); 2403 2404 return (-1); 2405 } 2406 2407 int 2408 ssl3_send_client_verify(SSL *s) 2409 { 2410 unsigned char *p; 2411 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; 2412 EVP_PKEY *pkey; 2413 EVP_PKEY_CTX *pctx = NULL; 2414 EVP_MD_CTX mctx; 2415 unsigned u = 0; 2416 unsigned long n; 2417 int j; 2418 2419 EVP_MD_CTX_init(&mctx); 2420 2421 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2422 p = ssl3_handshake_msg_start(s, SSL3_MT_CERTIFICATE_VERIFY); 2423 2424 /* 2425 * Create context from key and test if sha1 is allowed as 2426 * digest. 2427 */ 2428 pkey = s->cert->key->privatekey; 2429 pctx = EVP_PKEY_CTX_new(pkey, NULL); 2430 EVP_PKEY_sign_init(pctx); 2431 2432 /* XXX - is this needed? */ 2433 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1()) <= 0) 2434 ERR_clear_error(); 2435 2436 if (!SSL_USE_SIGALGS(s)) { 2437 if (S3I(s)->handshake_buffer) { 2438 if (!tls1_digest_cached_records(s)) 2439 goto err; 2440 } 2441 if (!tls1_handshake_hash_value(s, data, sizeof(data), 2442 NULL)) 2443 goto err; 2444 } 2445 2446 /* 2447 * For TLS v1.2 send signature algorithm and signature 2448 * using agreed digest and cached handshake records. 2449 */ 2450 if (SSL_USE_SIGALGS(s)) { 2451 long hdatalen = 0; 2452 void *hdata; 2453 const EVP_MD *md = s->cert->key->digest; 2454 hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer, 2455 &hdata); 2456 if (hdatalen <= 0 || 2457 !tls12_get_sigandhash(p, pkey, md)) { 2458 SSLerror(s, ERR_R_INTERNAL_ERROR); 2459 goto err; 2460 } 2461 p += 2; 2462 if (!EVP_SignInit_ex(&mctx, md, NULL) || 2463 !EVP_SignUpdate(&mctx, hdata, hdatalen) || 2464 !EVP_SignFinal(&mctx, p + 2, &u, pkey)) { 2465 SSLerror(s, ERR_R_EVP_LIB); 2466 goto err; 2467 } 2468 s2n(u, p); 2469 n = u + 4; 2470 if (!tls1_digest_cached_records(s)) 2471 goto err; 2472 } else if (pkey->type == EVP_PKEY_RSA) { 2473 if (RSA_sign(NID_md5_sha1, data, 2474 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, &(p[2]), 2475 &u, pkey->pkey.rsa) <= 0 ) { 2476 SSLerror(s, ERR_R_RSA_LIB); 2477 goto err; 2478 } 2479 s2n(u, p); 2480 n = u + 2; 2481 } else if (pkey->type == EVP_PKEY_EC) { 2482 if (!ECDSA_sign(pkey->save_type, 2483 &(data[MD5_DIGEST_LENGTH]), 2484 SHA_DIGEST_LENGTH, &(p[2]), 2485 (unsigned int *)&j, pkey->pkey.ec)) { 2486 SSLerror(s, ERR_R_ECDSA_LIB); 2487 goto err; 2488 } 2489 s2n(j, p); 2490 n = j + 2; 2491 #ifndef OPENSSL_NO_GOST 2492 } else if (pkey->type == NID_id_GostR3410_94 || 2493 pkey->type == NID_id_GostR3410_2001) { 2494 unsigned char signbuf[128]; 2495 long hdatalen = 0; 2496 void *hdata; 2497 const EVP_MD *md; 2498 int nid; 2499 size_t sigsize; 2500 2501 hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer, &hdata); 2502 if (hdatalen <= 0) { 2503 SSLerror(s, ERR_R_INTERNAL_ERROR); 2504 goto err; 2505 } 2506 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2507 !(md = EVP_get_digestbynid(nid))) { 2508 SSLerror(s, ERR_R_EVP_LIB); 2509 goto err; 2510 } 2511 if (!EVP_DigestInit_ex(&mctx, md, NULL) || 2512 !EVP_DigestUpdate(&mctx, hdata, hdatalen) || 2513 !EVP_DigestFinal(&mctx, signbuf, &u) || 2514 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) || 2515 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2516 EVP_PKEY_CTRL_GOST_SIG_FORMAT, 2517 GOST_SIG_FORMAT_RS_LE, 2518 NULL) <= 0) || 2519 (EVP_PKEY_sign(pctx, &(p[2]), &sigsize, 2520 signbuf, u) <= 0)) { 2521 SSLerror(s, ERR_R_EVP_LIB); 2522 goto err; 2523 } 2524 if (!tls1_digest_cached_records(s)) 2525 goto err; 2526 j = sigsize; 2527 s2n(j, p); 2528 n = j + 2; 2529 #endif 2530 } else { 2531 SSLerror(s, ERR_R_INTERNAL_ERROR); 2532 goto err; 2533 } 2534 2535 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2536 2537 ssl3_handshake_msg_finish(s, n); 2538 } 2539 2540 EVP_MD_CTX_cleanup(&mctx); 2541 EVP_PKEY_CTX_free(pctx); 2542 2543 return (ssl3_handshake_write(s)); 2544 2545 err: 2546 EVP_MD_CTX_cleanup(&mctx); 2547 EVP_PKEY_CTX_free(pctx); 2548 return (-1); 2549 } 2550 2551 int 2552 ssl3_send_client_certificate(SSL *s) 2553 { 2554 EVP_PKEY *pkey = NULL; 2555 X509 *x509 = NULL; 2556 CBB cbb, client_cert; 2557 int i; 2558 2559 memset(&cbb, 0, sizeof(cbb)); 2560 2561 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2562 if ((s->cert == NULL) || (s->cert->key->x509 == NULL) || 2563 (s->cert->key->privatekey == NULL)) 2564 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2565 else 2566 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2567 } 2568 2569 /* We need to get a client cert */ 2570 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2571 /* 2572 * If we get an error, we need to 2573 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 2574 * We then get retied later 2575 */ 2576 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2577 if (i < 0) { 2578 s->internal->rwstate = SSL_X509_LOOKUP; 2579 return (-1); 2580 } 2581 s->internal->rwstate = SSL_NOTHING; 2582 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2583 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2584 if (!SSL_use_certificate(s, x509) || 2585 !SSL_use_PrivateKey(s, pkey)) 2586 i = 0; 2587 } else if (i == 1) { 2588 i = 0; 2589 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2590 } 2591 2592 X509_free(x509); 2593 EVP_PKEY_free(pkey); 2594 if (i == 0) 2595 S3I(s)->tmp.cert_req = 2; 2596 2597 /* Ok, we have a cert */ 2598 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2599 } 2600 2601 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2602 if (!ssl3_handshake_msg_start_cbb(s, &cbb, &client_cert, 2603 SSL3_MT_CERTIFICATE)) 2604 goto err; 2605 if (!ssl3_output_cert_chain(s, &client_cert, 2606 (S3I(s)->tmp.cert_req == 2) ? NULL : s->cert->key->x509)) 2607 goto err; 2608 if (!ssl3_handshake_msg_finish_cbb(s, &cbb)) 2609 goto err; 2610 2611 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2612 } 2613 2614 /* SSL3_ST_CW_CERT_D */ 2615 return (ssl3_handshake_write(s)); 2616 2617 err: 2618 CBB_cleanup(&cbb); 2619 2620 return (0); 2621 } 2622 2623 #define has_bits(i,m) (((i)&(m)) == (m)) 2624 2625 int 2626 ssl3_check_cert_and_algorithm(SSL *s) 2627 { 2628 int i, idx; 2629 long alg_k, alg_a; 2630 EVP_PKEY *pkey = NULL; 2631 SESS_CERT *sc; 2632 DH *dh; 2633 2634 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2635 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 2636 2637 /* We don't have a certificate. */ 2638 if (alg_a & SSL_aNULL) 2639 return (1); 2640 2641 sc = SSI(s)->sess_cert; 2642 if (sc == NULL) { 2643 SSLerror(s, ERR_R_INTERNAL_ERROR); 2644 goto err; 2645 } 2646 dh = SSI(s)->sess_cert->peer_dh_tmp; 2647 2648 /* This is the passed certificate. */ 2649 2650 idx = sc->peer_cert_type; 2651 if (idx == SSL_PKEY_ECC) { 2652 if (ssl_check_srvr_ecc_cert_and_alg( 2653 sc->peer_pkeys[idx].x509, s) == 0) { 2654 /* check failed */ 2655 SSLerror(s, SSL_R_BAD_ECC_CERT); 2656 goto f_err; 2657 } else { 2658 return (1); 2659 } 2660 } 2661 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2662 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2663 EVP_PKEY_free(pkey); 2664 2665 /* Check that we have a certificate if we require one. */ 2666 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2667 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2668 goto f_err; 2669 } 2670 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2671 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2672 goto f_err; 2673 } 2674 if ((alg_k & SSL_kDHE) && 2675 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2676 SSLerror(s, SSL_R_MISSING_DH_KEY); 2677 goto f_err; 2678 } 2679 2680 return (1); 2681 f_err: 2682 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2683 err: 2684 return (0); 2685 } 2686 2687 /* 2688 * Check to see if handshake is full or resumed. Usually this is just a 2689 * case of checking to see if a cache hit has occurred. In the case of 2690 * session tickets we have to check the next message to be sure. 2691 */ 2692 2693 int 2694 ssl3_check_finished(SSL *s) 2695 { 2696 int ok; 2697 long n; 2698 2699 /* If we have no ticket it cannot be a resumed session. */ 2700 if (!s->session->tlsext_tick) 2701 return (1); 2702 /* this function is called when we really expect a Certificate 2703 * message, so permit appropriate message length */ 2704 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_A, 2705 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2706 if (!ok) 2707 return ((int)n); 2708 S3I(s)->tmp.reuse_message = 1; 2709 if ((S3I(s)->tmp.message_type == SSL3_MT_FINISHED) || 2710 (S3I(s)->tmp.message_type == SSL3_MT_NEWSESSION_TICKET)) 2711 return (2); 2712 2713 return (1); 2714 } 2715 2716 int 2717 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2718 { 2719 int i = 0; 2720 2721 #ifndef OPENSSL_NO_ENGINE 2722 if (s->ctx->internal->client_cert_engine) { 2723 i = ENGINE_load_ssl_client_cert( 2724 s->ctx->internal->client_cert_engine, s, 2725 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2726 if (i != 0) 2727 return (i); 2728 } 2729 #endif 2730 if (s->ctx->internal->client_cert_cb) 2731 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2732 return (i); 2733 } 2734