1 /* $OpenBSD: ssl_clnt.c,v 1.17 2017/08/12 21:47:59 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" 173 174 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b); 175 176 int 177 ssl3_connect(SSL *s) 178 { 179 void (*cb)(const SSL *ssl, int type, int val) = NULL; 180 int ret = -1; 181 int new_state, state, skip = 0; 182 183 ERR_clear_error(); 184 errno = 0; 185 186 if (s->internal->info_callback != NULL) 187 cb = s->internal->info_callback; 188 else if (s->ctx->internal->info_callback != NULL) 189 cb = s->ctx->internal->info_callback; 190 191 s->internal->in_handshake++; 192 if (!SSL_in_init(s) || SSL_in_before(s)) 193 SSL_clear(s); 194 195 for (;;) { 196 state = S3I(s)->hs.state; 197 198 switch (S3I(s)->hs.state) { 199 case SSL_ST_RENEGOTIATE: 200 s->internal->renegotiate = 1; 201 S3I(s)->hs.state = SSL_ST_CONNECT; 202 s->ctx->internal->stats.sess_connect_renegotiate++; 203 /* break */ 204 case SSL_ST_BEFORE: 205 case SSL_ST_CONNECT: 206 case SSL_ST_BEFORE|SSL_ST_CONNECT: 207 case SSL_ST_OK|SSL_ST_CONNECT: 208 209 s->server = 0; 210 if (cb != NULL) 211 cb(s, SSL_CB_HANDSHAKE_START, 1); 212 213 if ((s->version & 0xff00 ) != 0x0300) { 214 SSLerror(s, ERR_R_INTERNAL_ERROR); 215 ret = -1; 216 goto end; 217 } 218 219 /* s->version=SSL3_VERSION; */ 220 s->internal->type = SSL_ST_CONNECT; 221 222 if (!ssl3_setup_init_buffer(s)) { 223 ret = -1; 224 goto end; 225 } 226 if (!ssl3_setup_buffers(s)) { 227 ret = -1; 228 goto end; 229 } 230 if (!ssl_init_wbio_buffer(s, 0)) { 231 ret = -1; 232 goto end; 233 } 234 235 /* don't push the buffering BIO quite yet */ 236 237 if (!tls1_init_finished_mac(s)) { 238 ret = -1; 239 goto end; 240 } 241 242 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 243 s->ctx->internal->stats.sess_connect++; 244 s->internal->init_num = 0; 245 break; 246 247 case SSL3_ST_CW_CLNT_HELLO_A: 248 case SSL3_ST_CW_CLNT_HELLO_B: 249 250 s->internal->shutdown = 0; 251 ret = ssl3_client_hello(s); 252 if (ret <= 0) 253 goto end; 254 S3I(s)->hs.state = SSL3_ST_CR_SRVR_HELLO_A; 255 s->internal->init_num = 0; 256 257 /* turn on buffering for the next lot of output */ 258 if (s->bbio != s->wbio) 259 s->wbio = BIO_push(s->bbio, s->wbio); 260 261 break; 262 263 case SSL3_ST_CR_SRVR_HELLO_A: 264 case SSL3_ST_CR_SRVR_HELLO_B: 265 ret = ssl3_get_server_hello(s); 266 if (ret <= 0) 267 goto end; 268 269 if (s->internal->hit) { 270 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 271 if (s->internal->tlsext_ticket_expected) { 272 /* receive renewed session ticket */ 273 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 274 } 275 } else 276 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 277 s->internal->init_num = 0; 278 break; 279 280 case SSL3_ST_CR_CERT_A: 281 case SSL3_ST_CR_CERT_B: 282 ret = ssl3_check_finished(s); 283 if (ret <= 0) 284 goto end; 285 if (ret == 2) { 286 s->internal->hit = 1; 287 if (s->internal->tlsext_ticket_expected) 288 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 289 else 290 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 291 s->internal->init_num = 0; 292 break; 293 } 294 /* Check if it is anon DH/ECDH. */ 295 if (!(S3I(s)->hs.new_cipher->algorithm_auth & 296 SSL_aNULL)) { 297 ret = ssl3_get_server_certificate(s); 298 if (ret <= 0) 299 goto end; 300 if (s->internal->tlsext_status_expected) 301 S3I(s)->hs.state = SSL3_ST_CR_CERT_STATUS_A; 302 else 303 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 304 } else { 305 skip = 1; 306 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 307 } 308 s->internal->init_num = 0; 309 break; 310 311 case SSL3_ST_CR_KEY_EXCH_A: 312 case SSL3_ST_CR_KEY_EXCH_B: 313 ret = ssl3_get_server_key_exchange(s); 314 if (ret <= 0) 315 goto end; 316 S3I(s)->hs.state = SSL3_ST_CR_CERT_REQ_A; 317 s->internal->init_num = 0; 318 319 /* 320 * At this point we check that we have the 321 * required stuff from the server. 322 */ 323 if (!ssl3_check_cert_and_algorithm(s)) { 324 ret = -1; 325 goto end; 326 } 327 break; 328 329 case SSL3_ST_CR_CERT_REQ_A: 330 case SSL3_ST_CR_CERT_REQ_B: 331 ret = ssl3_get_certificate_request(s); 332 if (ret <= 0) 333 goto end; 334 S3I(s)->hs.state = SSL3_ST_CR_SRVR_DONE_A; 335 s->internal->init_num = 0; 336 break; 337 338 case SSL3_ST_CR_SRVR_DONE_A: 339 case SSL3_ST_CR_SRVR_DONE_B: 340 ret = ssl3_get_server_done(s); 341 if (ret <= 0) 342 goto end; 343 if (S3I(s)->tmp.cert_req) 344 S3I(s)->hs.state = SSL3_ST_CW_CERT_A; 345 else 346 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 347 s->internal->init_num = 0; 348 349 break; 350 351 case SSL3_ST_CW_CERT_A: 352 case SSL3_ST_CW_CERT_B: 353 case SSL3_ST_CW_CERT_C: 354 case SSL3_ST_CW_CERT_D: 355 ret = ssl3_send_client_certificate(s); 356 if (ret <= 0) 357 goto end; 358 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 359 s->internal->init_num = 0; 360 break; 361 362 case SSL3_ST_CW_KEY_EXCH_A: 363 case SSL3_ST_CW_KEY_EXCH_B: 364 ret = ssl3_send_client_key_exchange(s); 365 if (ret <= 0) 366 goto end; 367 /* 368 * EAY EAY EAY need to check for DH fix cert 369 * sent back 370 */ 371 /* 372 * For TLS, cert_req is set to 2, so a cert chain 373 * of nothing is sent, but no verify packet is sent 374 */ 375 /* 376 * XXX: For now, we do not support client 377 * authentication in ECDH cipher suites with 378 * ECDH (rather than ECDSA) certificates. 379 * We need to skip the certificate verify 380 * message when client's ECDH public key is sent 381 * inside the client certificate. 382 */ 383 if (S3I(s)->tmp.cert_req == 1) { 384 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_A; 385 } else { 386 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 387 S3I(s)->change_cipher_spec = 0; 388 } 389 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 390 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 391 S3I(s)->change_cipher_spec = 0; 392 } 393 394 s->internal->init_num = 0; 395 break; 396 397 case SSL3_ST_CW_CERT_VRFY_A: 398 case SSL3_ST_CW_CERT_VRFY_B: 399 ret = ssl3_send_client_verify(s); 400 if (ret <= 0) 401 goto end; 402 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 403 s->internal->init_num = 0; 404 S3I(s)->change_cipher_spec = 0; 405 break; 406 407 case SSL3_ST_CW_CHANGE_A: 408 case SSL3_ST_CW_CHANGE_B: 409 ret = ssl3_send_change_cipher_spec(s, 410 SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B); 411 if (ret <= 0) 412 goto end; 413 414 S3I(s)->hs.state = SSL3_ST_CW_FINISHED_A; 415 s->internal->init_num = 0; 416 417 s->session->cipher = S3I(s)->hs.new_cipher; 418 if (!tls1_setup_key_block(s)) { 419 ret = -1; 420 goto end; 421 } 422 423 if (!tls1_change_cipher_state(s, 424 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) { 425 ret = -1; 426 goto end; 427 } 428 429 break; 430 431 case SSL3_ST_CW_FINISHED_A: 432 case SSL3_ST_CW_FINISHED_B: 433 ret = ssl3_send_finished(s, SSL3_ST_CW_FINISHED_A, 434 SSL3_ST_CW_FINISHED_B, 435 TLS_MD_CLIENT_FINISH_CONST, 436 TLS_MD_CLIENT_FINISH_CONST_SIZE); 437 if (ret <= 0) 438 goto end; 439 s->s3->flags |= SSL3_FLAGS_CCS_OK; 440 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 441 442 /* clear flags */ 443 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER; 444 if (s->internal->hit) { 445 S3I(s)->hs.next_state = SSL_ST_OK; 446 if (s->s3->flags & 447 SSL3_FLAGS_DELAY_CLIENT_FINISHED) { 448 S3I(s)->hs.state = SSL_ST_OK; 449 s->s3->flags|=SSL3_FLAGS_POP_BUFFER; 450 S3I(s)->delay_buf_pop_ret = 0; 451 } 452 } else { 453 /* Allow NewSessionTicket if ticket expected */ 454 if (s->internal->tlsext_ticket_expected) 455 S3I(s)->hs.next_state = 456 SSL3_ST_CR_SESSION_TICKET_A; 457 else 458 459 S3I(s)->hs.next_state = SSL3_ST_CR_FINISHED_A; 460 } 461 s->internal->init_num = 0; 462 break; 463 464 case SSL3_ST_CR_SESSION_TICKET_A: 465 case SSL3_ST_CR_SESSION_TICKET_B: 466 ret = ssl3_get_new_session_ticket(s); 467 if (ret <= 0) 468 goto end; 469 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 470 s->internal->init_num = 0; 471 break; 472 473 case SSL3_ST_CR_CERT_STATUS_A: 474 case SSL3_ST_CR_CERT_STATUS_B: 475 ret = ssl3_get_cert_status(s); 476 if (ret <= 0) 477 goto end; 478 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 479 s->internal->init_num = 0; 480 break; 481 482 case SSL3_ST_CR_FINISHED_A: 483 case SSL3_ST_CR_FINISHED_B: 484 s->s3->flags |= SSL3_FLAGS_CCS_OK; 485 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 486 SSL3_ST_CR_FINISHED_B); 487 if (ret <= 0) 488 goto end; 489 490 if (s->internal->hit) 491 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 492 else 493 S3I(s)->hs.state = SSL_ST_OK; 494 s->internal->init_num = 0; 495 break; 496 497 case SSL3_ST_CW_FLUSH: 498 s->internal->rwstate = SSL_WRITING; 499 if (BIO_flush(s->wbio) <= 0) { 500 ret = -1; 501 goto end; 502 } 503 s->internal->rwstate = SSL_NOTHING; 504 S3I(s)->hs.state = S3I(s)->hs.next_state; 505 break; 506 507 case SSL_ST_OK: 508 /* clean a few things up */ 509 tls1_cleanup_key_block(s); 510 511 BUF_MEM_free(s->internal->init_buf); 512 s->internal->init_buf = NULL; 513 514 /* 515 * If we are not 'joining' the last two packets, 516 * remove the buffering now 517 */ 518 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 519 ssl_free_wbio_buffer(s); 520 /* else do it later in ssl3_write */ 521 522 s->internal->init_num = 0; 523 s->internal->renegotiate = 0; 524 s->internal->new_session = 0; 525 526 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 527 if (s->internal->hit) 528 s->ctx->internal->stats.sess_hit++; 529 530 ret = 1; 531 /* s->server=0; */ 532 s->internal->handshake_func = ssl3_connect; 533 s->ctx->internal->stats.sess_connect_good++; 534 535 if (cb != NULL) 536 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 537 538 goto end; 539 /* break; */ 540 541 default: 542 SSLerror(s, SSL_R_UNKNOWN_STATE); 543 ret = -1; 544 goto end; 545 /* break; */ 546 } 547 548 /* did we do anything */ 549 if (!S3I(s)->tmp.reuse_message && !skip) { 550 if (s->internal->debug) { 551 if ((ret = BIO_flush(s->wbio)) <= 0) 552 goto end; 553 } 554 555 if ((cb != NULL) && (S3I(s)->hs.state != state)) { 556 new_state = S3I(s)->hs.state; 557 S3I(s)->hs.state = state; 558 cb(s, SSL_CB_CONNECT_LOOP, 1); 559 S3I(s)->hs.state = new_state; 560 } 561 } 562 skip = 0; 563 } 564 565 end: 566 s->internal->in_handshake--; 567 if (cb != NULL) 568 cb(s, SSL_CB_CONNECT_EXIT, ret); 569 570 return (ret); 571 } 572 573 int 574 ssl3_client_hello(SSL *s) 575 { 576 unsigned char *bufend, *p, *d; 577 uint16_t max_version; 578 size_t outlen; 579 int i; 580 581 bufend = (unsigned char *)s->internal->init_buf->data + SSL3_RT_MAX_PLAIN_LENGTH; 582 583 if (S3I(s)->hs.state == SSL3_ST_CW_CLNT_HELLO_A) { 584 SSL_SESSION *sess = s->session; 585 586 if (ssl_supported_version_range(s, NULL, &max_version) != 1) { 587 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 588 return (-1); 589 } 590 s->client_version = s->version = max_version; 591 592 if ((sess == NULL) || 593 (sess->ssl_version != s->version) || 594 (!sess->session_id_length && !sess->tlsext_tick) || 595 (sess->internal->not_resumable)) { 596 if (!ssl_get_new_session(s, 0)) 597 goto err; 598 } 599 /* else use the pre-loaded session */ 600 601 /* 602 * If a DTLS ClientHello message is being resent after a 603 * HelloVerifyRequest, we must retain the original client 604 * random value. 605 */ 606 if (!SSL_IS_DTLS(s) || D1I(s)->send_cookie == 0) 607 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE); 608 609 d = p = ssl3_handshake_msg_start(s, SSL3_MT_CLIENT_HELLO); 610 611 /* 612 * Version indicates the negotiated version: for example from 613 * an SSLv2/v3 compatible client hello). The client_version 614 * field is the maximum version we permit and it is also 615 * used in RSA encrypted premaster secrets. Some servers can 616 * choke if we initially report a higher version then 617 * renegotiate to a lower one in the premaster secret. This 618 * didn't happen with TLS 1.0 as most servers supported it 619 * but it can with TLS 1.1 or later if the server only supports 620 * 1.0. 621 * 622 * Possible scenario with previous logic: 623 * 1. Client hello indicates TLS 1.2 624 * 2. Server hello says TLS 1.0 625 * 3. RSA encrypted premaster secret uses 1.2. 626 * 4. Handhaked proceeds using TLS 1.0. 627 * 5. Server sends hello request to renegotiate. 628 * 6. Client hello indicates TLS v1.0 as we now 629 * know that is maximum server supports. 630 * 7. Server chokes on RSA encrypted premaster secret 631 * containing version 1.0. 632 * 633 * For interoperability it should be OK to always use the 634 * maximum version we support in client hello and then rely 635 * on the checking of version to ensure the servers isn't 636 * being inconsistent: for example initially negotiating with 637 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using 638 * client_version in client hello and not resetting it to 639 * the negotiated version. 640 */ 641 642 *(p++) = s->client_version >> 8; 643 *(p++) = s->client_version & 0xff; 644 645 /* Random stuff */ 646 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 647 p += SSL3_RANDOM_SIZE; 648 649 /* Session ID */ 650 if (s->internal->new_session) 651 i = 0; 652 else 653 i = s->session->session_id_length; 654 *(p++) = i; 655 if (i != 0) { 656 if (i > (int)sizeof(s->session->session_id)) { 657 SSLerror(s, ERR_R_INTERNAL_ERROR); 658 goto err; 659 } 660 memcpy(p, s->session->session_id, i); 661 p += i; 662 } 663 664 /* DTLS Cookie. */ 665 if (SSL_IS_DTLS(s)) { 666 if (D1I(s)->cookie_len > sizeof(D1I(s)->cookie)) { 667 SSLerror(s, ERR_R_INTERNAL_ERROR); 668 goto err; 669 } 670 *(p++) = D1I(s)->cookie_len; 671 memcpy(p, D1I(s)->cookie, D1I(s)->cookie_len); 672 p += D1I(s)->cookie_len; 673 } 674 675 /* Ciphers supported */ 676 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &p[2], 677 bufend - &p[2], &outlen)) 678 goto err; 679 if (outlen == 0) { 680 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE); 681 goto err; 682 } 683 s2n(outlen, p); 684 p += outlen; 685 686 /* add in (no) COMPRESSION */ 687 *(p++) = 1; 688 *(p++) = 0; /* Add the NULL method */ 689 690 /* TLS extensions*/ 691 if ((p = ssl_add_clienthello_tlsext(s, p, bufend)) == NULL) { 692 SSLerror(s, ERR_R_INTERNAL_ERROR); 693 goto err; 694 } 695 696 ssl3_handshake_msg_finish(s, p - d); 697 698 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_B; 699 } 700 701 /* SSL3_ST_CW_CLNT_HELLO_B */ 702 return (ssl3_handshake_write(s)); 703 704 err: 705 return (-1); 706 } 707 708 int 709 ssl3_get_server_hello(SSL *s) 710 { 711 CBS cbs, server_random, session_id; 712 uint16_t server_version, cipher_suite; 713 uint16_t min_version, max_version; 714 uint8_t compression_method; 715 STACK_OF(SSL_CIPHER) *sk; 716 const SSL_CIPHER *cipher; 717 const SSL_METHOD *method; 718 unsigned char *p; 719 unsigned long alg_k; 720 size_t outlen; 721 int i, al, ok; 722 long n; 723 724 s->internal->first_packet = 1; 725 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 726 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, /* ?? */ &ok); 727 if (!ok) 728 return ((int)n); 729 s->internal->first_packet = 0; 730 731 if (n < 0) 732 goto truncated; 733 734 CBS_init(&cbs, s->internal->init_msg, n); 735 736 if (SSL_IS_DTLS(s)) { 737 if (S3I(s)->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 738 if (D1I(s)->send_cookie == 0) { 739 S3I(s)->tmp.reuse_message = 1; 740 return (1); 741 } else { 742 /* Already sent a cookie. */ 743 al = SSL_AD_UNEXPECTED_MESSAGE; 744 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 745 goto f_err; 746 } 747 } 748 } 749 750 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_HELLO) { 751 al = SSL_AD_UNEXPECTED_MESSAGE; 752 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 753 goto f_err; 754 } 755 756 if (!CBS_get_u16(&cbs, &server_version)) 757 goto truncated; 758 759 if (ssl_supported_version_range(s, &min_version, &max_version) != 1) { 760 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 761 goto err; 762 } 763 764 if (server_version < min_version || server_version > max_version) { 765 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 766 s->version = (s->version & 0xff00) | (server_version & 0xff); 767 al = SSL_AD_PROTOCOL_VERSION; 768 goto f_err; 769 } 770 s->version = server_version; 771 772 if ((method = tls1_get_client_method(server_version)) == NULL) 773 method = dtls1_get_client_method(server_version); 774 if (method == NULL) { 775 SSLerror(s, ERR_R_INTERNAL_ERROR); 776 goto err; 777 } 778 s->method = method; 779 780 /* Server random. */ 781 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 782 goto truncated; 783 if (!CBS_write_bytes(&server_random, s->s3->server_random, 784 sizeof(s->s3->server_random), NULL)) 785 goto err; 786 787 /* Session ID. */ 788 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 789 goto truncated; 790 791 if ((CBS_len(&session_id) > sizeof(s->session->session_id)) || 792 (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE)) { 793 al = SSL_AD_ILLEGAL_PARAMETER; 794 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 795 goto f_err; 796 } 797 798 /* Cipher suite. */ 799 if (!CBS_get_u16(&cbs, &cipher_suite)) 800 goto truncated; 801 802 /* 803 * Check if we want to resume the session based on external 804 * pre-shared secret. 805 */ 806 if (s->internal->tls_session_secret_cb) { 807 SSL_CIPHER *pref_cipher = NULL; 808 s->session->master_key_length = sizeof(s->session->master_key); 809 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 810 &s->session->master_key_length, NULL, &pref_cipher, 811 s->internal->tls_session_secret_cb_arg)) { 812 s->session->cipher = pref_cipher ? pref_cipher : 813 ssl3_get_cipher_by_value(cipher_suite); 814 s->s3->flags |= SSL3_FLAGS_CCS_OK; 815 } 816 } 817 818 if (s->session->session_id_length != 0 && 819 CBS_mem_equal(&session_id, s->session->session_id, 820 s->session->session_id_length)) { 821 if (s->sid_ctx_length != s->session->sid_ctx_length || 822 timingsafe_memcmp(s->session->sid_ctx, 823 s->sid_ctx, s->sid_ctx_length) != 0) { 824 /* actually a client application bug */ 825 al = SSL_AD_ILLEGAL_PARAMETER; 826 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 827 goto f_err; 828 } 829 s->s3->flags |= SSL3_FLAGS_CCS_OK; 830 s->internal->hit = 1; 831 } else { 832 /* a miss or crap from the other end */ 833 834 /* If we were trying for session-id reuse, make a new 835 * SSL_SESSION so we don't stuff up other people */ 836 s->internal->hit = 0; 837 if (s->session->session_id_length > 0) { 838 if (!ssl_get_new_session(s, 0)) { 839 al = SSL_AD_INTERNAL_ERROR; 840 goto f_err; 841 } 842 } 843 844 /* 845 * XXX - improve the handling for the case where there is a 846 * zero length session identifier. 847 */ 848 if (!CBS_write_bytes(&session_id, s->session->session_id, 849 sizeof(s->session->session_id), &outlen)) 850 goto err; 851 s->session->session_id_length = outlen; 852 853 s->session->ssl_version = s->version; 854 } 855 856 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 857 al = SSL_AD_ILLEGAL_PARAMETER; 858 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 859 goto f_err; 860 } 861 862 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 863 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 864 (TLS1_get_version(s) < TLS1_2_VERSION)) { 865 al = SSL_AD_ILLEGAL_PARAMETER; 866 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 867 goto f_err; 868 } 869 870 sk = ssl_get_ciphers_by_id(s); 871 i = sk_SSL_CIPHER_find(sk, cipher); 872 if (i < 0) { 873 /* we did not say we would use this cipher */ 874 al = SSL_AD_ILLEGAL_PARAMETER; 875 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 876 goto f_err; 877 } 878 879 /* 880 * Depending on the session caching (internal/external), the cipher 881 * and/or cipher_id values may not be set. Make sure that 882 * cipher_id is set and use it for comparison. 883 */ 884 if (s->session->cipher) 885 s->session->cipher_id = s->session->cipher->id; 886 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 887 al = SSL_AD_ILLEGAL_PARAMETER; 888 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 889 goto f_err; 890 } 891 S3I(s)->hs.new_cipher = cipher; 892 893 if (!tls1_handshake_hash_init(s)) 894 goto err; 895 896 /* 897 * Don't digest cached records if no sigalgs: we may need them for 898 * client authentication. 899 */ 900 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 901 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) && 902 !tls1_digest_cached_records(s)) { 903 al = SSL_AD_INTERNAL_ERROR; 904 goto f_err; 905 } 906 907 if (!CBS_get_u8(&cbs, &compression_method)) 908 goto truncated; 909 910 if (compression_method != 0) { 911 al = SSL_AD_ILLEGAL_PARAMETER; 912 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 913 goto f_err; 914 } 915 916 /* TLS extensions. */ 917 p = (unsigned char *)CBS_data(&cbs); 918 if (!ssl_parse_serverhello_tlsext(s, &p, CBS_len(&cbs), &al)) { 919 /* 'al' set by ssl_parse_serverhello_tlsext */ 920 SSLerror(s, SSL_R_PARSE_TLSEXT); 921 goto f_err; 922 } 923 if (ssl_check_serverhello_tlsext(s) <= 0) { 924 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 925 goto err; 926 } 927 928 /* See if any data remains... */ 929 if (p - CBS_data(&cbs) != CBS_len(&cbs)) 930 goto truncated; 931 932 return (1); 933 934 truncated: 935 /* wrong packet length */ 936 al = SSL_AD_DECODE_ERROR; 937 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 938 f_err: 939 ssl3_send_alert(s, SSL3_AL_FATAL, al); 940 err: 941 return (-1); 942 } 943 944 int 945 ssl3_get_server_certificate(SSL *s) 946 { 947 int al, i, ok, ret = -1; 948 long n; 949 CBS cbs, cert_list; 950 X509 *x = NULL; 951 const unsigned char *q; 952 STACK_OF(X509) *sk = NULL; 953 SESS_CERT *sc; 954 EVP_PKEY *pkey = NULL; 955 956 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_A, 957 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 958 959 if (!ok) 960 return ((int)n); 961 962 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 963 S3I(s)->tmp.reuse_message = 1; 964 return (1); 965 } 966 967 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 968 al = SSL_AD_UNEXPECTED_MESSAGE; 969 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 970 goto f_err; 971 } 972 973 974 if ((sk = sk_X509_new_null()) == NULL) { 975 SSLerror(s, ERR_R_MALLOC_FAILURE); 976 goto err; 977 } 978 979 if (n < 0) 980 goto truncated; 981 982 CBS_init(&cbs, s->internal->init_msg, n); 983 if (CBS_len(&cbs) < 3) 984 goto truncated; 985 986 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 987 CBS_len(&cbs) != 0) { 988 al = SSL_AD_DECODE_ERROR; 989 SSLerror(s, SSL_R_LENGTH_MISMATCH); 990 goto f_err; 991 } 992 993 while (CBS_len(&cert_list) > 0) { 994 CBS cert; 995 996 if (CBS_len(&cert_list) < 3) 997 goto truncated; 998 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 999 al = SSL_AD_DECODE_ERROR; 1000 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1001 goto f_err; 1002 } 1003 1004 q = CBS_data(&cert); 1005 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1006 if (x == NULL) { 1007 al = SSL_AD_BAD_CERTIFICATE; 1008 SSLerror(s, ERR_R_ASN1_LIB); 1009 goto f_err; 1010 } 1011 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1012 al = SSL_AD_DECODE_ERROR; 1013 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1014 goto f_err; 1015 } 1016 if (!sk_X509_push(sk, x)) { 1017 SSLerror(s, ERR_R_MALLOC_FAILURE); 1018 goto err; 1019 } 1020 x = NULL; 1021 } 1022 1023 i = ssl_verify_cert_chain(s, sk); 1024 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1025 al = ssl_verify_alarm_type(s->verify_result); 1026 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1027 goto f_err; 1028 1029 } 1030 ERR_clear_error(); /* but we keep s->verify_result */ 1031 1032 sc = ssl_sess_cert_new(); 1033 if (sc == NULL) 1034 goto err; 1035 ssl_sess_cert_free(SSI(s)->sess_cert); 1036 SSI(s)->sess_cert = sc; 1037 1038 sc->cert_chain = sk; 1039 /* 1040 * Inconsistency alert: cert_chain does include the peer's 1041 * certificate, which we don't include in s3_srvr.c 1042 */ 1043 x = sk_X509_value(sk, 0); 1044 sk = NULL; 1045 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1046 1047 pkey = X509_get_pubkey(x); 1048 1049 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1050 x = NULL; 1051 al = SSL3_AL_FATAL; 1052 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1053 goto f_err; 1054 } 1055 1056 i = ssl_cert_type(x, pkey); 1057 if (i < 0) { 1058 x = NULL; 1059 al = SSL3_AL_FATAL; 1060 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1061 goto f_err; 1062 } 1063 1064 sc->peer_cert_type = i; 1065 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1066 /* 1067 * Why would the following ever happen? 1068 * We just created sc a couple of lines ago. 1069 */ 1070 X509_free(sc->peer_pkeys[i].x509); 1071 sc->peer_pkeys[i].x509 = x; 1072 sc->peer_key = &(sc->peer_pkeys[i]); 1073 1074 X509_free(s->session->peer); 1075 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1076 s->session->peer = x; 1077 s->session->verify_result = s->verify_result; 1078 1079 x = NULL; 1080 ret = 1; 1081 1082 if (0) { 1083 truncated: 1084 /* wrong packet length */ 1085 al = SSL_AD_DECODE_ERROR; 1086 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1087 f_err: 1088 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1089 } 1090 err: 1091 EVP_PKEY_free(pkey); 1092 X509_free(x); 1093 sk_X509_pop_free(sk, X509_free); 1094 1095 return (ret); 1096 } 1097 1098 static int 1099 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, unsigned char **pp, long *nn) 1100 { 1101 CBS cbs, dhp, dhg, dhpk; 1102 BN_CTX *bn_ctx = NULL; 1103 SESS_CERT *sc = NULL; 1104 DH *dh = NULL; 1105 long alg_a; 1106 int al; 1107 1108 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1109 sc = SSI(s)->sess_cert; 1110 1111 if (*nn < 0) 1112 goto err; 1113 1114 CBS_init(&cbs, *pp, *nn); 1115 1116 if ((dh = DH_new()) == NULL) { 1117 SSLerror(s, ERR_R_DH_LIB); 1118 goto err; 1119 } 1120 1121 if (!CBS_get_u16_length_prefixed(&cbs, &dhp)) 1122 goto truncated; 1123 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1124 SSLerror(s, ERR_R_BN_LIB); 1125 goto err; 1126 } 1127 1128 if (!CBS_get_u16_length_prefixed(&cbs, &dhg)) 1129 goto truncated; 1130 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1131 SSLerror(s, ERR_R_BN_LIB); 1132 goto err; 1133 } 1134 1135 if (!CBS_get_u16_length_prefixed(&cbs, &dhpk)) 1136 goto truncated; 1137 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1138 NULL)) == NULL) { 1139 SSLerror(s, ERR_R_BN_LIB); 1140 goto err; 1141 } 1142 1143 /* 1144 * Check the strength of the DH key just constructed. 1145 * Discard keys weaker than 1024 bits. 1146 */ 1147 if (DH_size(dh) < 1024 / 8) { 1148 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1149 goto err; 1150 } 1151 1152 if (alg_a & SSL_aRSA) 1153 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1154 else 1155 /* XXX - Anonymous DH, so no certificate or pkey. */ 1156 *pkey = NULL; 1157 1158 sc->peer_dh_tmp = dh; 1159 1160 *nn = CBS_len(&cbs); 1161 *pp = (unsigned char *)CBS_data(&cbs); 1162 1163 return (1); 1164 1165 truncated: 1166 al = SSL_AD_DECODE_ERROR; 1167 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1168 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1169 1170 err: 1171 DH_free(dh); 1172 BN_CTX_free(bn_ctx); 1173 1174 return (-1); 1175 } 1176 1177 static int 1178 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1179 { 1180 const EC_GROUP *group; 1181 EC_GROUP *ngroup = NULL; 1182 EC_POINT *point = NULL; 1183 BN_CTX *bn_ctx = NULL; 1184 EC_KEY *ecdh = NULL; 1185 int ret = -1; 1186 1187 /* 1188 * Extract the server's ephemeral ECDH public key. 1189 */ 1190 1191 if ((ecdh = EC_KEY_new()) == NULL) { 1192 SSLerror(s, ERR_R_MALLOC_FAILURE); 1193 goto err; 1194 } 1195 1196 if ((ngroup = EC_GROUP_new_by_curve_name(nid)) == NULL) { 1197 SSLerror(s, ERR_R_EC_LIB); 1198 goto err; 1199 } 1200 if (EC_KEY_set_group(ecdh, ngroup) == 0) { 1201 SSLerror(s, ERR_R_EC_LIB); 1202 goto err; 1203 } 1204 1205 group = EC_KEY_get0_group(ecdh); 1206 1207 if ((point = EC_POINT_new(group)) == NULL || 1208 (bn_ctx = BN_CTX_new()) == NULL) { 1209 SSLerror(s, ERR_R_MALLOC_FAILURE); 1210 goto err; 1211 } 1212 1213 if (EC_POINT_oct2point(group, point, CBS_data(public), 1214 CBS_len(public), bn_ctx) == 0) { 1215 SSLerror(s, SSL_R_BAD_ECPOINT); 1216 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1217 goto err; 1218 } 1219 1220 EC_KEY_set_public_key(ecdh, point); 1221 sc->peer_ecdh_tmp = ecdh; 1222 ecdh = NULL; 1223 1224 ret = 1; 1225 1226 err: 1227 BN_CTX_free(bn_ctx); 1228 EC_GROUP_free(ngroup); 1229 EC_POINT_free(point); 1230 EC_KEY_free(ecdh); 1231 1232 return (ret); 1233 } 1234 1235 static int 1236 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1237 { 1238 size_t outlen; 1239 1240 if (nid != NID_X25519) { 1241 SSLerror(s, ERR_R_INTERNAL_ERROR); 1242 goto err; 1243 } 1244 1245 if (CBS_len(public) != X25519_KEY_LENGTH) { 1246 SSLerror(s, SSL_R_BAD_ECPOINT); 1247 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1248 goto err; 1249 } 1250 1251 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1252 SSLerror(s, ERR_R_MALLOC_FAILURE); 1253 goto err; 1254 } 1255 1256 return (1); 1257 1258 err: 1259 return (-1); 1260 } 1261 1262 static int 1263 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, unsigned char **pp, long *nn) 1264 { 1265 CBS cbs, public; 1266 uint8_t curve_type; 1267 uint16_t curve_id; 1268 SESS_CERT *sc; 1269 long alg_a; 1270 int nid; 1271 int al; 1272 1273 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1274 sc = SSI(s)->sess_cert; 1275 1276 if (*nn < 0) 1277 goto err; 1278 1279 CBS_init(&cbs, *pp, *nn); 1280 1281 /* Only named curves are supported. */ 1282 if (!CBS_get_u8(&cbs, &curve_type) || 1283 curve_type != NAMED_CURVE_TYPE || 1284 !CBS_get_u16(&cbs, &curve_id)) { 1285 al = SSL_AD_DECODE_ERROR; 1286 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1287 goto f_err; 1288 } 1289 1290 /* 1291 * Check that the curve is one of our preferences - if it is not, 1292 * the server has sent us an invalid curve. 1293 */ 1294 if (tls1_check_curve(s, curve_id) != 1) { 1295 al = SSL_AD_DECODE_ERROR; 1296 SSLerror(s, SSL_R_WRONG_CURVE); 1297 goto f_err; 1298 } 1299 1300 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1301 al = SSL_AD_INTERNAL_ERROR; 1302 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1303 goto f_err; 1304 } 1305 1306 if (!CBS_get_u8_length_prefixed(&cbs, &public)) 1307 goto truncated; 1308 1309 if (nid == NID_X25519) { 1310 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1311 goto err; 1312 } else { 1313 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1314 goto err; 1315 } 1316 1317 /* 1318 * The ECC/TLS specification does not mention the use of DSA to sign 1319 * ECParameters in the server key exchange message. We do support RSA 1320 * and ECDSA. 1321 */ 1322 if (alg_a & SSL_aRSA) 1323 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1324 else if (alg_a & SSL_aECDSA) 1325 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1326 else 1327 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1328 *pkey = NULL; 1329 1330 *nn = CBS_len(&cbs); 1331 *pp = (unsigned char *)CBS_data(&cbs); 1332 1333 return (1); 1334 1335 truncated: 1336 al = SSL_AD_DECODE_ERROR; 1337 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1338 1339 f_err: 1340 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1341 1342 err: 1343 return (-1); 1344 } 1345 1346 int 1347 ssl3_get_server_key_exchange(SSL *s) 1348 { 1349 unsigned char *q, md_buf[EVP_MAX_MD_SIZE*2]; 1350 EVP_MD_CTX md_ctx; 1351 unsigned char *param, *p; 1352 int al, i, j, param_len, ok; 1353 long n, alg_k, alg_a; 1354 EVP_PKEY *pkey = NULL; 1355 const EVP_MD *md = NULL; 1356 RSA *rsa = NULL; 1357 1358 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1359 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1360 1361 /* 1362 * Use same message size as in ssl3_get_certificate_request() 1363 * as ServerKeyExchange message may be skipped. 1364 */ 1365 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1366 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1367 if (!ok) 1368 return ((int)n); 1369 1370 EVP_MD_CTX_init(&md_ctx); 1371 1372 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1373 /* 1374 * Do not skip server key exchange if this cipher suite uses 1375 * ephemeral keys. 1376 */ 1377 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1378 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1379 al = SSL_AD_UNEXPECTED_MESSAGE; 1380 goto f_err; 1381 } 1382 1383 S3I(s)->tmp.reuse_message = 1; 1384 EVP_MD_CTX_cleanup(&md_ctx); 1385 return (1); 1386 } 1387 1388 if (SSI(s)->sess_cert != NULL) { 1389 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1390 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1391 1392 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1393 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1394 1395 free(SSI(s)->sess_cert->peer_x25519_tmp); 1396 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1397 } else { 1398 SSI(s)->sess_cert = ssl_sess_cert_new(); 1399 if (SSI(s)->sess_cert == NULL) 1400 goto err; 1401 } 1402 1403 param = p = (unsigned char *)s->internal->init_msg; 1404 param_len = n; 1405 1406 if (alg_k & SSL_kDHE) { 1407 if (ssl3_get_server_kex_dhe(s, &pkey, &p, &n) != 1) 1408 goto err; 1409 } else if (alg_k & SSL_kECDHE) { 1410 if (ssl3_get_server_kex_ecdhe(s, &pkey, &p, &n) != 1) 1411 goto err; 1412 } else if (alg_k != 0) { 1413 al = SSL_AD_UNEXPECTED_MESSAGE; 1414 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1415 goto f_err; 1416 } 1417 1418 param_len = param_len - n; 1419 1420 /* if it was signed, check the signature */ 1421 if (pkey != NULL) { 1422 if (SSL_USE_SIGALGS(s)) { 1423 int sigalg = tls12_get_sigid(pkey); 1424 /* Should never happen */ 1425 if (sigalg == -1) { 1426 SSLerror(s, ERR_R_INTERNAL_ERROR); 1427 goto err; 1428 } 1429 /* 1430 * Check key type is consistent 1431 * with signature 1432 */ 1433 if (2 > n) 1434 goto truncated; 1435 if (sigalg != (int)p[1]) { 1436 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 1437 al = SSL_AD_DECODE_ERROR; 1438 goto f_err; 1439 } 1440 md = tls12_get_hash(p[0]); 1441 if (md == NULL) { 1442 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1443 al = SSL_AD_DECODE_ERROR; 1444 goto f_err; 1445 } 1446 p += 2; 1447 n -= 2; 1448 } else 1449 md = EVP_sha1(); 1450 1451 if (2 > n) 1452 goto truncated; 1453 n2s(p, i); 1454 n -= 2; 1455 j = EVP_PKEY_size(pkey); 1456 1457 if (i != n || n > j) { 1458 /* wrong packet length */ 1459 al = SSL_AD_DECODE_ERROR; 1460 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1461 goto f_err; 1462 } 1463 1464 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) { 1465 j = 0; 1466 q = md_buf; 1467 if (!EVP_DigestInit_ex(&md_ctx, EVP_md5_sha1(), NULL)) { 1468 al = SSL_AD_INTERNAL_ERROR; 1469 goto f_err; 1470 } 1471 EVP_DigestUpdate(&md_ctx, s->s3->client_random, 1472 SSL3_RANDOM_SIZE); 1473 EVP_DigestUpdate(&md_ctx, s->s3->server_random, 1474 SSL3_RANDOM_SIZE); 1475 EVP_DigestUpdate(&md_ctx, param, param_len); 1476 EVP_DigestFinal_ex(&md_ctx, q, (unsigned int *)&i); 1477 q += i; 1478 j += i; 1479 i = RSA_verify(NID_md5_sha1, md_buf, j, 1480 p, n, pkey->pkey.rsa); 1481 if (i < 0) { 1482 al = SSL_AD_DECRYPT_ERROR; 1483 SSLerror(s, SSL_R_BAD_RSA_DECRYPT); 1484 goto f_err; 1485 } 1486 if (i == 0) { 1487 /* bad signature */ 1488 al = SSL_AD_DECRYPT_ERROR; 1489 SSLerror(s, SSL_R_BAD_SIGNATURE); 1490 goto f_err; 1491 } 1492 } else { 1493 EVP_VerifyInit_ex(&md_ctx, md, NULL); 1494 EVP_VerifyUpdate(&md_ctx, s->s3->client_random, 1495 SSL3_RANDOM_SIZE); 1496 EVP_VerifyUpdate(&md_ctx, s->s3->server_random, 1497 SSL3_RANDOM_SIZE); 1498 EVP_VerifyUpdate(&md_ctx, param, param_len); 1499 if (EVP_VerifyFinal(&md_ctx, p,(int)n, pkey) <= 0) { 1500 /* bad signature */ 1501 al = SSL_AD_DECRYPT_ERROR; 1502 SSLerror(s, SSL_R_BAD_SIGNATURE); 1503 goto f_err; 1504 } 1505 } 1506 } else { 1507 /* aNULL does not need public keys. */ 1508 if (!(alg_a & SSL_aNULL)) { 1509 SSLerror(s, ERR_R_INTERNAL_ERROR); 1510 goto err; 1511 } 1512 /* still data left over */ 1513 if (n != 0) { 1514 al = SSL_AD_DECODE_ERROR; 1515 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1516 goto f_err; 1517 } 1518 } 1519 1520 EVP_PKEY_free(pkey); 1521 EVP_MD_CTX_cleanup(&md_ctx); 1522 1523 return (1); 1524 1525 truncated: 1526 /* wrong packet length */ 1527 al = SSL_AD_DECODE_ERROR; 1528 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1529 1530 f_err: 1531 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1532 1533 err: 1534 EVP_PKEY_free(pkey); 1535 RSA_free(rsa); 1536 EVP_MD_CTX_cleanup(&md_ctx); 1537 1538 return (-1); 1539 } 1540 1541 int 1542 ssl3_get_certificate_request(SSL *s) 1543 { 1544 int ok, ret = 0; 1545 long n; 1546 uint8_t ctype_num; 1547 CBS cert_request, ctypes, rdn_list; 1548 X509_NAME *xn = NULL; 1549 const unsigned char *q; 1550 STACK_OF(X509_NAME) *ca_sk = NULL; 1551 1552 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1553 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1554 1555 if (!ok) 1556 return ((int)n); 1557 1558 S3I(s)->tmp.cert_req = 0; 1559 1560 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_DONE) { 1561 S3I(s)->tmp.reuse_message = 1; 1562 /* 1563 * If we get here we don't need any cached handshake records 1564 * as we wont be doing client auth. 1565 */ 1566 if (S3I(s)->handshake_buffer) { 1567 if (!tls1_digest_cached_records(s)) 1568 goto err; 1569 } 1570 return (1); 1571 } 1572 1573 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1574 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1575 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1576 goto err; 1577 } 1578 1579 /* TLS does not like anon-DH with client cert */ 1580 if (S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL) { 1581 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1582 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1583 goto err; 1584 } 1585 1586 if (n < 0) 1587 goto truncated; 1588 CBS_init(&cert_request, s->internal->init_msg, n); 1589 1590 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1591 SSLerror(s, ERR_R_MALLOC_FAILURE); 1592 goto err; 1593 } 1594 1595 /* get the certificate types */ 1596 if (!CBS_get_u8(&cert_request, &ctype_num)) 1597 goto truncated; 1598 1599 if (ctype_num > SSL3_CT_NUMBER) 1600 ctype_num = SSL3_CT_NUMBER; 1601 if (!CBS_get_bytes(&cert_request, &ctypes, ctype_num) || 1602 !CBS_write_bytes(&ctypes, (uint8_t *)S3I(s)->tmp.ctype, 1603 sizeof(S3I(s)->tmp.ctype), NULL)) { 1604 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1605 goto err; 1606 } 1607 1608 if (SSL_USE_SIGALGS(s)) { 1609 CBS sigalgs; 1610 1611 if (CBS_len(&cert_request) < 2) { 1612 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1613 goto err; 1614 } 1615 1616 /* Check we have enough room for signature algorithms and 1617 * following length value. 1618 */ 1619 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1620 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1621 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1622 goto err; 1623 } 1624 if (!tls1_process_sigalgs(s, &sigalgs)) { 1625 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1626 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1627 goto err; 1628 } 1629 } 1630 1631 /* get the CA RDNs */ 1632 if (CBS_len(&cert_request) < 2) { 1633 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1634 goto err; 1635 } 1636 1637 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1638 CBS_len(&cert_request) != 0) { 1639 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1640 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1641 goto err; 1642 } 1643 1644 while (CBS_len(&rdn_list) > 0) { 1645 CBS rdn; 1646 1647 if (CBS_len(&rdn_list) < 2) { 1648 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1649 goto err; 1650 } 1651 1652 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1653 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1654 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1655 goto err; 1656 } 1657 1658 q = CBS_data(&rdn); 1659 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1660 ssl3_send_alert(s, SSL3_AL_FATAL, 1661 SSL_AD_DECODE_ERROR); 1662 SSLerror(s, ERR_R_ASN1_LIB); 1663 goto err; 1664 } 1665 1666 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1667 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1668 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1669 goto err; 1670 } 1671 if (!sk_X509_NAME_push(ca_sk, xn)) { 1672 SSLerror(s, ERR_R_MALLOC_FAILURE); 1673 goto err; 1674 } 1675 xn = NULL; /* avoid free in err block */ 1676 } 1677 1678 /* we should setup a certificate to return.... */ 1679 S3I(s)->tmp.cert_req = 1; 1680 S3I(s)->tmp.ctype_num = ctype_num; 1681 sk_X509_NAME_pop_free(S3I(s)->tmp.ca_names, X509_NAME_free); 1682 S3I(s)->tmp.ca_names = ca_sk; 1683 ca_sk = NULL; 1684 1685 ret = 1; 1686 if (0) { 1687 truncated: 1688 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1689 } 1690 err: 1691 X509_NAME_free(xn); 1692 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1693 return (ret); 1694 } 1695 1696 static int 1697 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1698 { 1699 return (X509_NAME_cmp(*a, *b)); 1700 } 1701 1702 int 1703 ssl3_get_new_session_ticket(SSL *s) 1704 { 1705 int ok, al, ret = 0; 1706 uint32_t lifetime_hint; 1707 long n; 1708 CBS cbs, session_ticket; 1709 1710 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1711 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1712 if (!ok) 1713 return ((int)n); 1714 1715 if (S3I(s)->tmp.message_type == SSL3_MT_FINISHED) { 1716 S3I(s)->tmp.reuse_message = 1; 1717 return (1); 1718 } 1719 if (S3I(s)->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) { 1720 al = SSL_AD_UNEXPECTED_MESSAGE; 1721 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1722 goto f_err; 1723 } 1724 1725 if (n < 0) { 1726 al = SSL_AD_DECODE_ERROR; 1727 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1728 goto f_err; 1729 } 1730 1731 CBS_init(&cbs, s->internal->init_msg, n); 1732 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1733 #if UINT32_MAX > LONG_MAX 1734 lifetime_hint > LONG_MAX || 1735 #endif 1736 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1737 CBS_len(&cbs) != 0) { 1738 al = SSL_AD_DECODE_ERROR; 1739 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1740 goto f_err; 1741 } 1742 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1743 1744 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1745 &s->session->tlsext_ticklen)) { 1746 SSLerror(s, ERR_R_MALLOC_FAILURE); 1747 goto err; 1748 } 1749 1750 /* 1751 * There are two ways to detect a resumed ticket sesion. 1752 * One is to set an appropriate session ID and then the server 1753 * must return a match in ServerHello. This allows the normal 1754 * client session ID matching to work and we know much 1755 * earlier that the ticket has been accepted. 1756 * 1757 * The other way is to set zero length session ID when the 1758 * ticket is presented and rely on the handshake to determine 1759 * session resumption. 1760 * 1761 * We choose the former approach because this fits in with 1762 * assumptions elsewhere in OpenSSL. The session ID is set 1763 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1764 * ticket. 1765 */ 1766 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1767 s->session->session_id, &s->session->session_id_length, 1768 EVP_sha256(), NULL); 1769 ret = 1; 1770 return (ret); 1771 f_err: 1772 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1773 err: 1774 return (-1); 1775 } 1776 1777 int 1778 ssl3_get_cert_status(SSL *s) 1779 { 1780 CBS cert_status, response; 1781 size_t stow_len; 1782 int ok, al; 1783 long n; 1784 uint8_t status_type; 1785 1786 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1787 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 1788 16384, &ok); 1789 1790 if (!ok) 1791 return ((int)n); 1792 1793 if (n < 0) { 1794 /* need at least status type + length */ 1795 al = SSL_AD_DECODE_ERROR; 1796 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1797 goto f_err; 1798 } 1799 1800 CBS_init(&cert_status, s->internal->init_msg, n); 1801 if (!CBS_get_u8(&cert_status, &status_type) || 1802 CBS_len(&cert_status) < 3) { 1803 /* need at least status type + length */ 1804 al = SSL_AD_DECODE_ERROR; 1805 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1806 goto f_err; 1807 } 1808 1809 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1810 al = SSL_AD_DECODE_ERROR; 1811 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1812 goto f_err; 1813 } 1814 1815 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1816 CBS_len(&cert_status) != 0) { 1817 al = SSL_AD_DECODE_ERROR; 1818 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1819 goto f_err; 1820 } 1821 1822 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1823 &stow_len) || stow_len > INT_MAX) { 1824 s->internal->tlsext_ocsp_resplen = 0; 1825 al = SSL_AD_INTERNAL_ERROR; 1826 SSLerror(s, ERR_R_MALLOC_FAILURE); 1827 goto f_err; 1828 } 1829 s->internal->tlsext_ocsp_resplen = (int)stow_len; 1830 1831 if (s->ctx->internal->tlsext_status_cb) { 1832 int ret; 1833 ret = s->ctx->internal->tlsext_status_cb(s, 1834 s->ctx->internal->tlsext_status_arg); 1835 if (ret == 0) { 1836 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1837 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1838 goto f_err; 1839 } 1840 if (ret < 0) { 1841 al = SSL_AD_INTERNAL_ERROR; 1842 SSLerror(s, ERR_R_MALLOC_FAILURE); 1843 goto f_err; 1844 } 1845 } 1846 return (1); 1847 f_err: 1848 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1849 return (-1); 1850 } 1851 1852 int 1853 ssl3_get_server_done(SSL *s) 1854 { 1855 int ok, ret = 0; 1856 long n; 1857 1858 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1859 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1860 30, /* should be very small, like 0 :-) */ &ok); 1861 1862 if (!ok) 1863 return ((int)n); 1864 if (n > 0) { 1865 /* should contain no data */ 1866 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1867 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1868 return (-1); 1869 } 1870 ret = 1; 1871 return (ret); 1872 } 1873 1874 static int 1875 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1876 { 1877 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1878 unsigned char *enc_pms = NULL; 1879 EVP_PKEY *pkey = NULL; 1880 int ret = -1; 1881 int enc_len; 1882 CBB epms; 1883 1884 /* 1885 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1886 */ 1887 1888 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1889 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1890 pkey->pkey.rsa == NULL) { 1891 SSLerror(s, ERR_R_INTERNAL_ERROR); 1892 goto err; 1893 } 1894 1895 pms[0] = s->client_version >> 8; 1896 pms[1] = s->client_version & 0xff; 1897 arc4random_buf(&pms[2], sizeof(pms) - 2); 1898 1899 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1900 SSLerror(s, ERR_R_MALLOC_FAILURE); 1901 goto err; 1902 } 1903 1904 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 1905 RSA_PKCS1_PADDING); 1906 if (enc_len <= 0) { 1907 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1908 goto err; 1909 } 1910 1911 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1912 goto err; 1913 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 1914 goto err; 1915 if (!CBB_flush(cbb)) 1916 goto err; 1917 1918 s->session->master_key_length = 1919 tls1_generate_master_secret(s, 1920 s->session->master_key, pms, sizeof(pms)); 1921 1922 ret = 1; 1923 1924 err: 1925 explicit_bzero(pms, sizeof(pms)); 1926 EVP_PKEY_free(pkey); 1927 free(enc_pms); 1928 1929 return (ret); 1930 } 1931 1932 static int 1933 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1934 { 1935 DH *dh_srvr = NULL, *dh_clnt = NULL; 1936 unsigned char *key = NULL; 1937 int key_size = 0, key_len; 1938 unsigned char *data; 1939 int ret = -1; 1940 CBB dh_Yc; 1941 1942 /* Ensure that we have an ephemeral key for DHE. */ 1943 if (sess_cert->peer_dh_tmp == NULL) { 1944 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1945 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1946 goto err; 1947 } 1948 dh_srvr = sess_cert->peer_dh_tmp; 1949 1950 /* Generate a new random key. */ 1951 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 1952 SSLerror(s, ERR_R_DH_LIB); 1953 goto err; 1954 } 1955 if (!DH_generate_key(dh_clnt)) { 1956 SSLerror(s, ERR_R_DH_LIB); 1957 goto err; 1958 } 1959 key_size = DH_size(dh_clnt); 1960 if ((key = malloc(key_size)) == NULL) { 1961 SSLerror(s, ERR_R_MALLOC_FAILURE); 1962 goto err; 1963 } 1964 key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt); 1965 if (key_len <= 0) { 1966 SSLerror(s, ERR_R_DH_LIB); 1967 goto err; 1968 } 1969 1970 /* Generate master key from the result. */ 1971 s->session->master_key_length = 1972 tls1_generate_master_secret(s, 1973 s->session->master_key, key, key_len); 1974 1975 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 1976 goto err; 1977 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 1978 goto err; 1979 BN_bn2bin(dh_clnt->pub_key, data); 1980 if (!CBB_flush(cbb)) 1981 goto err; 1982 1983 ret = 1; 1984 1985 err: 1986 DH_free(dh_clnt); 1987 freezero(key, key_size); 1988 1989 return (ret); 1990 } 1991 1992 static int 1993 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 1994 { 1995 const EC_GROUP *group = NULL; 1996 const EC_POINT *point = NULL; 1997 EC_KEY *ecdh = NULL; 1998 BN_CTX *bn_ctx = NULL; 1999 unsigned char *key = NULL; 2000 unsigned char *data; 2001 size_t encoded_len; 2002 int key_size = 0, key_len; 2003 int ret = -1; 2004 CBB ecpoint; 2005 2006 if ((group = EC_KEY_get0_group(sc->peer_ecdh_tmp)) == NULL || 2007 (point = EC_KEY_get0_public_key(sc->peer_ecdh_tmp)) == NULL) { 2008 SSLerror(s, ERR_R_INTERNAL_ERROR); 2009 goto err; 2010 } 2011 2012 if ((ecdh = EC_KEY_new()) == NULL) { 2013 SSLerror(s, ERR_R_MALLOC_FAILURE); 2014 goto err; 2015 } 2016 2017 if (!EC_KEY_set_group(ecdh, group)) { 2018 SSLerror(s, ERR_R_EC_LIB); 2019 goto err; 2020 } 2021 2022 /* Generate a new ECDH key pair. */ 2023 if (!(EC_KEY_generate_key(ecdh))) { 2024 SSLerror(s, ERR_R_ECDH_LIB); 2025 goto err; 2026 } 2027 if ((key_size = ECDH_size(ecdh)) <= 0) { 2028 SSLerror(s, ERR_R_ECDH_LIB); 2029 goto err; 2030 } 2031 if ((key = malloc(key_size)) == NULL) { 2032 SSLerror(s, ERR_R_MALLOC_FAILURE); 2033 } 2034 key_len = ECDH_compute_key(key, key_size, point, ecdh, NULL); 2035 if (key_len <= 0) { 2036 SSLerror(s, ERR_R_ECDH_LIB); 2037 goto err; 2038 } 2039 2040 /* Generate master key from the result. */ 2041 s->session->master_key_length = 2042 tls1_generate_master_secret(s, 2043 s->session->master_key, key, key_len); 2044 2045 encoded_len = EC_POINT_point2oct(group, EC_KEY_get0_public_key(ecdh), 2046 POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL); 2047 if (encoded_len == 0) { 2048 SSLerror(s, ERR_R_ECDH_LIB); 2049 goto err; 2050 } 2051 2052 if ((bn_ctx = BN_CTX_new()) == NULL) { 2053 SSLerror(s, ERR_R_MALLOC_FAILURE); 2054 goto err; 2055 } 2056 2057 /* Encode the public key. */ 2058 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2059 goto err; 2060 if (!CBB_add_space(&ecpoint, &data, encoded_len)) 2061 goto err; 2062 if (EC_POINT_point2oct(group, EC_KEY_get0_public_key(ecdh), 2063 POINT_CONVERSION_UNCOMPRESSED, data, encoded_len, 2064 bn_ctx) == 0) 2065 goto err; 2066 if (!CBB_flush(cbb)) 2067 goto err; 2068 2069 ret = 1; 2070 2071 err: 2072 freezero(key, key_size); 2073 2074 BN_CTX_free(bn_ctx); 2075 EC_KEY_free(ecdh); 2076 2077 return (ret); 2078 } 2079 2080 static int 2081 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2082 { 2083 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2084 int ret = -1; 2085 CBB ecpoint; 2086 2087 /* Generate X25519 key pair and derive shared key. */ 2088 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2089 goto err; 2090 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2091 goto err; 2092 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2093 goto err; 2094 X25519_keypair(public_key, private_key); 2095 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2096 goto err; 2097 2098 /* Serialize the public key. */ 2099 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2100 goto err; 2101 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2102 goto err; 2103 if (!CBB_flush(cbb)) 2104 goto err; 2105 2106 /* Generate master key from the result. */ 2107 s->session->master_key_length = 2108 tls1_generate_master_secret(s, 2109 s->session->master_key, shared_key, X25519_KEY_LENGTH); 2110 2111 ret = 1; 2112 2113 err: 2114 free(public_key); 2115 freezero(private_key, X25519_KEY_LENGTH); 2116 freezero(shared_key, X25519_KEY_LENGTH); 2117 2118 return (ret); 2119 } 2120 2121 static int 2122 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2123 { 2124 if (sc->peer_x25519_tmp != NULL) { 2125 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2126 goto err; 2127 } else if (sc->peer_ecdh_tmp != NULL) { 2128 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2129 goto err; 2130 } else { 2131 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2132 SSLerror(s, ERR_R_INTERNAL_ERROR); 2133 goto err; 2134 } 2135 2136 return (1); 2137 2138 err: 2139 return (-1); 2140 } 2141 2142 static int 2143 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2144 { 2145 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2146 EVP_PKEY *pub_key = NULL; 2147 EVP_PKEY_CTX *pkey_ctx; 2148 X509 *peer_cert; 2149 size_t msglen; 2150 unsigned int md_len; 2151 EVP_MD_CTX *ukm_hash; 2152 int ret = -1; 2153 int nid; 2154 CBB gostblob; 2155 2156 /* Get server sertificate PKEY and create ctx from it */ 2157 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2158 if (peer_cert == NULL) { 2159 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2160 goto err; 2161 } 2162 2163 pub_key = X509_get_pubkey(peer_cert); 2164 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2165 2166 /* 2167 * If we have send a certificate, and certificate key parameters match 2168 * those of server certificate, use certificate key for key exchange. 2169 * Otherwise, generate ephemeral key pair. 2170 */ 2171 EVP_PKEY_encrypt_init(pkey_ctx); 2172 2173 /* Generate session key. */ 2174 arc4random_buf(premaster_secret, 32); 2175 2176 /* 2177 * If we have client certificate, use its secret as peer key. 2178 */ 2179 if (S3I(s)->tmp.cert_req && s->cert->key->privatekey) { 2180 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2181 s->cert->key->privatekey) <=0) { 2182 /* 2183 * If there was an error - just ignore it. 2184 * Ephemeral key would be used. 2185 */ 2186 ERR_clear_error(); 2187 } 2188 } 2189 2190 /* 2191 * Compute shared IV and store it in algorithm-specific context data. 2192 */ 2193 ukm_hash = EVP_MD_CTX_create(); 2194 if (ukm_hash == NULL) { 2195 SSLerror(s, ERR_R_MALLOC_FAILURE); 2196 goto err; 2197 } 2198 2199 if (ssl_get_algorithm2(s) & SSL_HANDSHAKE_MAC_GOST94) 2200 nid = NID_id_GostR3411_94; 2201 else 2202 nid = NID_id_tc26_gost3411_2012_256; 2203 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2204 goto err; 2205 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2206 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2207 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2208 EVP_MD_CTX_destroy(ukm_hash); 2209 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2210 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2211 SSLerror(s, SSL_R_LIBRARY_BUG); 2212 goto err; 2213 } 2214 2215 /* 2216 * Make GOST keytransport blob message, encapsulate it into sequence. 2217 */ 2218 msglen = 255; 2219 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2220 32) < 0) { 2221 SSLerror(s, SSL_R_LIBRARY_BUG); 2222 goto err; 2223 } 2224 2225 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2226 goto err; 2227 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2228 goto err; 2229 if (!CBB_flush(cbb)) 2230 goto err; 2231 2232 /* Check if pubkey from client certificate was used. */ 2233 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2234 NULL) > 0) { 2235 /* Set flag "skip certificate verify". */ 2236 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2237 } 2238 EVP_PKEY_CTX_free(pkey_ctx); 2239 s->session->master_key_length = 2240 tls1_generate_master_secret(s, 2241 s->session->master_key, premaster_secret, 32); 2242 2243 ret = 1; 2244 2245 err: 2246 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2247 EVP_PKEY_free(pub_key); 2248 2249 return (ret); 2250 } 2251 2252 int 2253 ssl3_send_client_key_exchange(SSL *s) 2254 { 2255 SESS_CERT *sess_cert; 2256 unsigned long alg_k; 2257 CBB cbb, kex; 2258 2259 memset(&cbb, 0, sizeof(cbb)); 2260 2261 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2262 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2263 2264 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2265 ssl3_send_alert(s, SSL3_AL_FATAL, 2266 SSL_AD_UNEXPECTED_MESSAGE); 2267 SSLerror(s, ERR_R_INTERNAL_ERROR); 2268 goto err; 2269 } 2270 2271 if (!ssl3_handshake_msg_start_cbb(s, &cbb, &kex, 2272 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2273 goto err; 2274 2275 if (alg_k & SSL_kRSA) { 2276 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2277 goto err; 2278 } else if (alg_k & SSL_kDHE) { 2279 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2280 goto err; 2281 } else if (alg_k & SSL_kECDHE) { 2282 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2283 goto err; 2284 } else if (alg_k & SSL_kGOST) { 2285 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2286 goto err; 2287 } else { 2288 ssl3_send_alert(s, SSL3_AL_FATAL, 2289 SSL_AD_HANDSHAKE_FAILURE); 2290 SSLerror(s, ERR_R_INTERNAL_ERROR); 2291 goto err; 2292 } 2293 2294 if (!ssl3_handshake_msg_finish_cbb(s, &cbb)) 2295 goto err; 2296 2297 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2298 } 2299 2300 /* SSL3_ST_CW_KEY_EXCH_B */ 2301 return (ssl3_handshake_write(s)); 2302 2303 err: 2304 CBB_cleanup(&cbb); 2305 2306 return (-1); 2307 } 2308 2309 int 2310 ssl3_send_client_verify(SSL *s) 2311 { 2312 unsigned char *p; 2313 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; 2314 EVP_PKEY *pkey; 2315 EVP_PKEY_CTX *pctx = NULL; 2316 EVP_MD_CTX mctx; 2317 unsigned u = 0; 2318 unsigned long n; 2319 int j; 2320 2321 EVP_MD_CTX_init(&mctx); 2322 2323 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2324 p = ssl3_handshake_msg_start(s, SSL3_MT_CERTIFICATE_VERIFY); 2325 2326 /* 2327 * Create context from key and test if sha1 is allowed as 2328 * digest. 2329 */ 2330 pkey = s->cert->key->privatekey; 2331 pctx = EVP_PKEY_CTX_new(pkey, NULL); 2332 EVP_PKEY_sign_init(pctx); 2333 2334 /* XXX - is this needed? */ 2335 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1()) <= 0) 2336 ERR_clear_error(); 2337 2338 if (!SSL_USE_SIGALGS(s)) { 2339 if (S3I(s)->handshake_buffer) { 2340 if (!tls1_digest_cached_records(s)) 2341 goto err; 2342 } 2343 if (!tls1_handshake_hash_value(s, data, sizeof(data), 2344 NULL)) 2345 goto err; 2346 } 2347 2348 /* 2349 * For TLS v1.2 send signature algorithm and signature 2350 * using agreed digest and cached handshake records. 2351 */ 2352 if (SSL_USE_SIGALGS(s)) { 2353 long hdatalen = 0; 2354 void *hdata; 2355 const EVP_MD *md = s->cert->key->digest; 2356 hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer, 2357 &hdata); 2358 if (hdatalen <= 0 || 2359 !tls12_get_sigandhash(p, pkey, md)) { 2360 SSLerror(s, ERR_R_INTERNAL_ERROR); 2361 goto err; 2362 } 2363 p += 2; 2364 if (!EVP_SignInit_ex(&mctx, md, NULL) || 2365 !EVP_SignUpdate(&mctx, hdata, hdatalen) || 2366 !EVP_SignFinal(&mctx, p + 2, &u, pkey)) { 2367 SSLerror(s, ERR_R_EVP_LIB); 2368 goto err; 2369 } 2370 s2n(u, p); 2371 n = u + 4; 2372 if (!tls1_digest_cached_records(s)) 2373 goto err; 2374 } else if (pkey->type == EVP_PKEY_RSA) { 2375 if (RSA_sign(NID_md5_sha1, data, 2376 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, &(p[2]), 2377 &u, pkey->pkey.rsa) <= 0 ) { 2378 SSLerror(s, ERR_R_RSA_LIB); 2379 goto err; 2380 } 2381 s2n(u, p); 2382 n = u + 2; 2383 } else if (pkey->type == EVP_PKEY_EC) { 2384 if (!ECDSA_sign(pkey->save_type, 2385 &(data[MD5_DIGEST_LENGTH]), 2386 SHA_DIGEST_LENGTH, &(p[2]), 2387 (unsigned int *)&j, pkey->pkey.ec)) { 2388 SSLerror(s, ERR_R_ECDSA_LIB); 2389 goto err; 2390 } 2391 s2n(j, p); 2392 n = j + 2; 2393 #ifndef OPENSSL_NO_GOST 2394 } else if (pkey->type == NID_id_GostR3410_94 || 2395 pkey->type == NID_id_GostR3410_2001) { 2396 unsigned char signbuf[128]; 2397 long hdatalen = 0; 2398 void *hdata; 2399 const EVP_MD *md; 2400 int nid; 2401 size_t sigsize; 2402 2403 hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer, &hdata); 2404 if (hdatalen <= 0) { 2405 SSLerror(s, ERR_R_INTERNAL_ERROR); 2406 goto err; 2407 } 2408 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2409 !(md = EVP_get_digestbynid(nid))) { 2410 SSLerror(s, ERR_R_EVP_LIB); 2411 goto err; 2412 } 2413 if (!EVP_DigestInit_ex(&mctx, md, NULL) || 2414 !EVP_DigestUpdate(&mctx, hdata, hdatalen) || 2415 !EVP_DigestFinal(&mctx, signbuf, &u) || 2416 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) || 2417 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2418 EVP_PKEY_CTRL_GOST_SIG_FORMAT, 2419 GOST_SIG_FORMAT_RS_LE, 2420 NULL) <= 0) || 2421 (EVP_PKEY_sign(pctx, &(p[2]), &sigsize, 2422 signbuf, u) <= 0)) { 2423 SSLerror(s, ERR_R_EVP_LIB); 2424 goto err; 2425 } 2426 if (!tls1_digest_cached_records(s)) 2427 goto err; 2428 j = sigsize; 2429 s2n(j, p); 2430 n = j + 2; 2431 #endif 2432 } else { 2433 SSLerror(s, ERR_R_INTERNAL_ERROR); 2434 goto err; 2435 } 2436 2437 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2438 2439 ssl3_handshake_msg_finish(s, n); 2440 } 2441 2442 EVP_MD_CTX_cleanup(&mctx); 2443 EVP_PKEY_CTX_free(pctx); 2444 2445 return (ssl3_handshake_write(s)); 2446 2447 err: 2448 EVP_MD_CTX_cleanup(&mctx); 2449 EVP_PKEY_CTX_free(pctx); 2450 return (-1); 2451 } 2452 2453 int 2454 ssl3_send_client_certificate(SSL *s) 2455 { 2456 EVP_PKEY *pkey = NULL; 2457 X509 *x509 = NULL; 2458 CBB cbb, client_cert; 2459 int i; 2460 2461 memset(&cbb, 0, sizeof(cbb)); 2462 2463 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2464 if ((s->cert == NULL) || (s->cert->key->x509 == NULL) || 2465 (s->cert->key->privatekey == NULL)) 2466 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2467 else 2468 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2469 } 2470 2471 /* We need to get a client cert */ 2472 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2473 /* 2474 * If we get an error, we need to 2475 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 2476 * We then get retied later 2477 */ 2478 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2479 if (i < 0) { 2480 s->internal->rwstate = SSL_X509_LOOKUP; 2481 return (-1); 2482 } 2483 s->internal->rwstate = SSL_NOTHING; 2484 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2485 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2486 if (!SSL_use_certificate(s, x509) || 2487 !SSL_use_PrivateKey(s, pkey)) 2488 i = 0; 2489 } else if (i == 1) { 2490 i = 0; 2491 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2492 } 2493 2494 X509_free(x509); 2495 EVP_PKEY_free(pkey); 2496 if (i == 0) 2497 S3I(s)->tmp.cert_req = 2; 2498 2499 /* Ok, we have a cert */ 2500 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2501 } 2502 2503 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2504 if (!ssl3_handshake_msg_start_cbb(s, &cbb, &client_cert, 2505 SSL3_MT_CERTIFICATE)) 2506 goto err; 2507 if (!ssl3_output_cert_chain(s, &client_cert, 2508 (S3I(s)->tmp.cert_req == 2) ? NULL : s->cert->key->x509)) 2509 goto err; 2510 if (!ssl3_handshake_msg_finish_cbb(s, &cbb)) 2511 goto err; 2512 2513 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2514 } 2515 2516 /* SSL3_ST_CW_CERT_D */ 2517 return (ssl3_handshake_write(s)); 2518 2519 err: 2520 CBB_cleanup(&cbb); 2521 2522 return (0); 2523 } 2524 2525 #define has_bits(i,m) (((i)&(m)) == (m)) 2526 2527 int 2528 ssl3_check_cert_and_algorithm(SSL *s) 2529 { 2530 int i, idx; 2531 long alg_k, alg_a; 2532 EVP_PKEY *pkey = NULL; 2533 SESS_CERT *sc; 2534 DH *dh; 2535 2536 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2537 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 2538 2539 /* We don't have a certificate. */ 2540 if (alg_a & SSL_aNULL) 2541 return (1); 2542 2543 sc = SSI(s)->sess_cert; 2544 if (sc == NULL) { 2545 SSLerror(s, ERR_R_INTERNAL_ERROR); 2546 goto err; 2547 } 2548 dh = SSI(s)->sess_cert->peer_dh_tmp; 2549 2550 /* This is the passed certificate. */ 2551 2552 idx = sc->peer_cert_type; 2553 if (idx == SSL_PKEY_ECC) { 2554 if (ssl_check_srvr_ecc_cert_and_alg( 2555 sc->peer_pkeys[idx].x509, s) == 0) { 2556 /* check failed */ 2557 SSLerror(s, SSL_R_BAD_ECC_CERT); 2558 goto f_err; 2559 } else { 2560 return (1); 2561 } 2562 } 2563 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2564 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2565 EVP_PKEY_free(pkey); 2566 2567 /* Check that we have a certificate if we require one. */ 2568 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2569 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2570 goto f_err; 2571 } 2572 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2573 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2574 goto f_err; 2575 } 2576 if ((alg_k & SSL_kDHE) && 2577 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2578 SSLerror(s, SSL_R_MISSING_DH_KEY); 2579 goto f_err; 2580 } 2581 2582 return (1); 2583 f_err: 2584 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2585 err: 2586 return (0); 2587 } 2588 2589 /* 2590 * Check to see if handshake is full or resumed. Usually this is just a 2591 * case of checking to see if a cache hit has occurred. In the case of 2592 * session tickets we have to check the next message to be sure. 2593 */ 2594 2595 int 2596 ssl3_check_finished(SSL *s) 2597 { 2598 int ok; 2599 long n; 2600 2601 /* If we have no ticket it cannot be a resumed session. */ 2602 if (!s->session->tlsext_tick) 2603 return (1); 2604 /* this function is called when we really expect a Certificate 2605 * message, so permit appropriate message length */ 2606 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_A, 2607 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2608 if (!ok) 2609 return ((int)n); 2610 S3I(s)->tmp.reuse_message = 1; 2611 if ((S3I(s)->tmp.message_type == SSL3_MT_FINISHED) || 2612 (S3I(s)->tmp.message_type == SSL3_MT_NEWSESSION_TICKET)) 2613 return (2); 2614 2615 return (1); 2616 } 2617 2618 int 2619 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2620 { 2621 int i = 0; 2622 2623 #ifndef OPENSSL_NO_ENGINE 2624 if (s->ctx->internal->client_cert_engine) { 2625 i = ENGINE_load_ssl_client_cert( 2626 s->ctx->internal->client_cert_engine, s, 2627 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2628 if (i != 0) 2629 return (i); 2630 } 2631 #endif 2632 if (s->ctx->internal->client_cert_cb) 2633 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2634 return (i); 2635 } 2636