s3_clnt.c revision 291854
1/* ssl/s3_clnt.c */ 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 <stdio.h> 152#include "ssl_locl.h" 153#include "kssl_lcl.h" 154#include <openssl/buffer.h> 155#include <openssl/rand.h> 156#include <openssl/objects.h> 157#include <openssl/evp.h> 158#include <openssl/md5.h> 159#ifdef OPENSSL_FIPS 160#include <openssl/fips.h> 161#endif 162#ifndef OPENSSL_NO_DH 163#include <openssl/dh.h> 164#endif 165#include <openssl/bn.h> 166#ifndef OPENSSL_NO_ENGINE 167#include <openssl/engine.h> 168#endif 169 170static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b); 171 172#ifndef OPENSSL_NO_SSL3_METHOD 173static const SSL_METHOD *ssl3_get_client_method(int ver) 174 { 175 if (ver == SSL3_VERSION) 176 return(SSLv3_client_method()); 177 else 178 return(NULL); 179 } 180 181IMPLEMENT_ssl3_meth_func(SSLv3_client_method, 182 ssl_undefined_function, 183 ssl3_connect, 184 ssl3_get_client_method) 185#endif 186 187int ssl3_connect(SSL *s) 188 { 189 BUF_MEM *buf=NULL; 190 unsigned long Time=(unsigned long)time(NULL); 191 void (*cb)(const SSL *ssl,int type,int val)=NULL; 192 int ret= -1; 193 int new_state,state,skip=0; 194 195 RAND_add(&Time,sizeof(Time),0); 196 ERR_clear_error(); 197 clear_sys_error(); 198 199 if (s->info_callback != NULL) 200 cb=s->info_callback; 201 else if (s->ctx->info_callback != NULL) 202 cb=s->ctx->info_callback; 203 204 s->in_handshake++; 205 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 206 207#ifndef OPENSSL_NO_HEARTBEATS 208 /* If we're awaiting a HeartbeatResponse, pretend we 209 * already got and don't await it anymore, because 210 * Heartbeats don't make sense during handshakes anyway. 211 */ 212 if (s->tlsext_hb_pending) 213 { 214 s->tlsext_hb_pending = 0; 215 s->tlsext_hb_seq++; 216 } 217#endif 218 219 for (;;) 220 { 221 state=s->state; 222 223 switch(s->state) 224 { 225 case SSL_ST_RENEGOTIATE: 226 s->renegotiate=1; 227 s->state=SSL_ST_CONNECT; 228 s->ctx->stats.sess_connect_renegotiate++; 229 /* break */ 230 case SSL_ST_BEFORE: 231 case SSL_ST_CONNECT: 232 case SSL_ST_BEFORE|SSL_ST_CONNECT: 233 case SSL_ST_OK|SSL_ST_CONNECT: 234 235 s->server=0; 236 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 237 238 if ((s->version & 0xff00 ) != 0x0300) 239 { 240 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR); 241 ret = -1; 242 goto end; 243 } 244 245 /* s->version=SSL3_VERSION; */ 246 s->type=SSL_ST_CONNECT; 247 248 if (s->init_buf == NULL) 249 { 250 if ((buf=BUF_MEM_new()) == NULL) 251 { 252 ret= -1; 253 goto end; 254 } 255 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 256 { 257 ret= -1; 258 goto end; 259 } 260 s->init_buf=buf; 261 buf=NULL; 262 } 263 264 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } 265 266 /* setup buffing BIO */ 267 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; } 268 269 /* don't push the buffering BIO quite yet */ 270 271 ssl3_init_finished_mac(s); 272 273 s->state=SSL3_ST_CW_CLNT_HELLO_A; 274 s->ctx->stats.sess_connect++; 275 s->init_num=0; 276 s->s3->flags &= ~SSL3_FLAGS_CCS_OK; 277 /* Should have been reset by ssl3_get_finished, too. */ 278 s->s3->change_cipher_spec = 0; 279 break; 280 281 case SSL3_ST_CW_CLNT_HELLO_A: 282 case SSL3_ST_CW_CLNT_HELLO_B: 283 284 s->shutdown=0; 285 ret=ssl3_client_hello(s); 286 if (ret <= 0) goto end; 287 s->state=SSL3_ST_CR_SRVR_HELLO_A; 288 s->init_num=0; 289 290 /* turn on buffering for the next lot of output */ 291 if (s->bbio != s->wbio) 292 s->wbio=BIO_push(s->bbio,s->wbio); 293 294 break; 295 296 case SSL3_ST_CR_SRVR_HELLO_A: 297 case SSL3_ST_CR_SRVR_HELLO_B: 298 ret=ssl3_get_server_hello(s); 299 if (ret <= 0) goto end; 300 301 if (s->hit) 302 { 303 s->state=SSL3_ST_CR_FINISHED_A; 304#ifndef OPENSSL_NO_TLSEXT 305 if (s->tlsext_ticket_expected) 306 { 307 /* receive renewed session ticket */ 308 s->state=SSL3_ST_CR_SESSION_TICKET_A; 309 } 310#endif 311 } 312 else 313 s->state=SSL3_ST_CR_CERT_A; 314 s->init_num=0; 315 break; 316 317 case SSL3_ST_CR_CERT_A: 318 case SSL3_ST_CR_CERT_B: 319 /* Check if it is anon DH/ECDH, SRP auth */ 320 /* or PSK */ 321 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) && 322 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 323 { 324 ret=ssl3_get_server_certificate(s); 325 if (ret <= 0) goto end; 326#ifndef OPENSSL_NO_TLSEXT 327 if (s->tlsext_status_expected) 328 s->state=SSL3_ST_CR_CERT_STATUS_A; 329 else 330 s->state=SSL3_ST_CR_KEY_EXCH_A; 331 } 332 else 333 { 334 skip = 1; 335 s->state=SSL3_ST_CR_KEY_EXCH_A; 336 } 337#else 338 } 339 else 340 skip=1; 341 342 s->state=SSL3_ST_CR_KEY_EXCH_A; 343#endif 344 s->init_num=0; 345 break; 346 347 case SSL3_ST_CR_KEY_EXCH_A: 348 case SSL3_ST_CR_KEY_EXCH_B: 349 ret=ssl3_get_key_exchange(s); 350 if (ret <= 0) goto end; 351 s->state=SSL3_ST_CR_CERT_REQ_A; 352 s->init_num=0; 353 354 /* at this point we check that we have the 355 * required stuff from the server */ 356 if (!ssl3_check_cert_and_algorithm(s)) 357 { 358 ret= -1; 359 goto end; 360 } 361 break; 362 363 case SSL3_ST_CR_CERT_REQ_A: 364 case SSL3_ST_CR_CERT_REQ_B: 365 ret=ssl3_get_certificate_request(s); 366 if (ret <= 0) goto end; 367 s->state=SSL3_ST_CR_SRVR_DONE_A; 368 s->init_num=0; 369 break; 370 371 case SSL3_ST_CR_SRVR_DONE_A: 372 case SSL3_ST_CR_SRVR_DONE_B: 373 ret=ssl3_get_server_done(s); 374 if (ret <= 0) goto end; 375#ifndef OPENSSL_NO_SRP 376 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) 377 { 378 if ((ret = SRP_Calc_A_param(s))<=0) 379 { 380 SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC); 381 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR); 382 goto end; 383 } 384 } 385#endif 386 if (s->s3->tmp.cert_req) 387 s->state=SSL3_ST_CW_CERT_A; 388 else 389 s->state=SSL3_ST_CW_KEY_EXCH_A; 390 s->init_num=0; 391 392 break; 393 394 case SSL3_ST_CW_CERT_A: 395 case SSL3_ST_CW_CERT_B: 396 case SSL3_ST_CW_CERT_C: 397 case SSL3_ST_CW_CERT_D: 398 ret=ssl3_send_client_certificate(s); 399 if (ret <= 0) goto end; 400 s->state=SSL3_ST_CW_KEY_EXCH_A; 401 s->init_num=0; 402 break; 403 404 case SSL3_ST_CW_KEY_EXCH_A: 405 case SSL3_ST_CW_KEY_EXCH_B: 406 ret=ssl3_send_client_key_exchange(s); 407 if (ret <= 0) goto end; 408 /* EAY EAY EAY need to check for DH fix cert 409 * sent back */ 410 /* For TLS, cert_req is set to 2, so a cert chain 411 * of nothing is sent, but no verify packet is sent */ 412 /* XXX: For now, we do not support client 413 * authentication in ECDH cipher suites with 414 * ECDH (rather than ECDSA) certificates. 415 * We need to skip the certificate verify 416 * message when client's ECDH public key is sent 417 * inside the client certificate. 418 */ 419 if (s->s3->tmp.cert_req == 1) 420 { 421 s->state=SSL3_ST_CW_CERT_VRFY_A; 422 } 423 else 424 { 425 s->state=SSL3_ST_CW_CHANGE_A; 426 } 427 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) 428 { 429 s->state=SSL3_ST_CW_CHANGE_A; 430 } 431 432 s->init_num=0; 433 break; 434 435 case SSL3_ST_CW_CERT_VRFY_A: 436 case SSL3_ST_CW_CERT_VRFY_B: 437 ret=ssl3_send_client_verify(s); 438 if (ret <= 0) goto end; 439 s->state=SSL3_ST_CW_CHANGE_A; 440 s->init_num=0; 441 break; 442 443 case SSL3_ST_CW_CHANGE_A: 444 case SSL3_ST_CW_CHANGE_B: 445 ret=ssl3_send_change_cipher_spec(s, 446 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B); 447 if (ret <= 0) goto end; 448 449#if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG) 450 s->state=SSL3_ST_CW_FINISHED_A; 451#else 452 if (s->s3->next_proto_neg_seen) 453 s->state=SSL3_ST_CW_NEXT_PROTO_A; 454 else 455 s->state=SSL3_ST_CW_FINISHED_A; 456#endif 457 s->init_num=0; 458 459 s->session->cipher=s->s3->tmp.new_cipher; 460#ifdef OPENSSL_NO_COMP 461 s->session->compress_meth=0; 462#else 463 if (s->s3->tmp.new_compression == NULL) 464 s->session->compress_meth=0; 465 else 466 s->session->compress_meth= 467 s->s3->tmp.new_compression->id; 468#endif 469 if (!s->method->ssl3_enc->setup_key_block(s)) 470 { 471 ret= -1; 472 goto end; 473 } 474 475 if (!s->method->ssl3_enc->change_cipher_state(s, 476 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 477 { 478 ret= -1; 479 goto end; 480 } 481 482 break; 483 484#if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG) 485 case SSL3_ST_CW_NEXT_PROTO_A: 486 case SSL3_ST_CW_NEXT_PROTO_B: 487 ret=ssl3_send_next_proto(s); 488 if (ret <= 0) goto end; 489 s->state=SSL3_ST_CW_FINISHED_A; 490 break; 491#endif 492 493 case SSL3_ST_CW_FINISHED_A: 494 case SSL3_ST_CW_FINISHED_B: 495 ret=ssl3_send_finished(s, 496 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B, 497 s->method->ssl3_enc->client_finished_label, 498 s->method->ssl3_enc->client_finished_label_len); 499 if (ret <= 0) goto end; 500 s->state=SSL3_ST_CW_FLUSH; 501 502 /* clear flags */ 503 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER; 504 if (s->hit) 505 { 506 s->s3->tmp.next_state=SSL_ST_OK; 507 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) 508 { 509 s->state=SSL_ST_OK; 510 s->s3->flags|=SSL3_FLAGS_POP_BUFFER; 511 s->s3->delay_buf_pop_ret=0; 512 } 513 } 514 else 515 { 516#ifndef OPENSSL_NO_TLSEXT 517 /* Allow NewSessionTicket if ticket expected */ 518 if (s->tlsext_ticket_expected) 519 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A; 520 else 521#endif 522 523 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A; 524 } 525 s->init_num=0; 526 break; 527 528#ifndef OPENSSL_NO_TLSEXT 529 case SSL3_ST_CR_SESSION_TICKET_A: 530 case SSL3_ST_CR_SESSION_TICKET_B: 531 ret=ssl3_get_new_session_ticket(s); 532 if (ret <= 0) goto end; 533 s->state=SSL3_ST_CR_FINISHED_A; 534 s->init_num=0; 535 break; 536 537 case SSL3_ST_CR_CERT_STATUS_A: 538 case SSL3_ST_CR_CERT_STATUS_B: 539 ret=ssl3_get_cert_status(s); 540 if (ret <= 0) goto end; 541 s->state=SSL3_ST_CR_KEY_EXCH_A; 542 s->init_num=0; 543 break; 544#endif 545 546 case SSL3_ST_CR_FINISHED_A: 547 case SSL3_ST_CR_FINISHED_B: 548 s->s3->flags |= SSL3_FLAGS_CCS_OK; 549 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A, 550 SSL3_ST_CR_FINISHED_B); 551 if (ret <= 0) goto end; 552 553 if (s->hit) 554 s->state=SSL3_ST_CW_CHANGE_A; 555 else 556 s->state=SSL_ST_OK; 557 s->init_num=0; 558 break; 559 560 case SSL3_ST_CW_FLUSH: 561 s->rwstate=SSL_WRITING; 562 if (BIO_flush(s->wbio) <= 0) 563 { 564 ret= -1; 565 goto end; 566 } 567 s->rwstate=SSL_NOTHING; 568 s->state=s->s3->tmp.next_state; 569 break; 570 571 case SSL_ST_OK: 572 /* clean a few things up */ 573 ssl3_cleanup_key_block(s); 574 575 if (s->init_buf != NULL) 576 { 577 BUF_MEM_free(s->init_buf); 578 s->init_buf=NULL; 579 } 580 581 /* If we are not 'joining' the last two packets, 582 * remove the buffering now */ 583 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 584 ssl_free_wbio_buffer(s); 585 /* else do it later in ssl3_write */ 586 587 s->init_num=0; 588 s->renegotiate=0; 589 s->new_session=0; 590 591 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT); 592 if (s->hit) s->ctx->stats.sess_hit++; 593 594 ret=1; 595 /* s->server=0; */ 596 s->handshake_func=ssl3_connect; 597 s->ctx->stats.sess_connect_good++; 598 599 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 600 601 goto end; 602 /* break; */ 603 604 default: 605 SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE); 606 ret= -1; 607 goto end; 608 /* break; */ 609 } 610 611 /* did we do anything */ 612 if (!s->s3->tmp.reuse_message && !skip) 613 { 614 if (s->debug) 615 { 616 if ((ret=BIO_flush(s->wbio)) <= 0) 617 goto end; 618 } 619 620 if ((cb != NULL) && (s->state != state)) 621 { 622 new_state=s->state; 623 s->state=state; 624 cb(s,SSL_CB_CONNECT_LOOP,1); 625 s->state=new_state; 626 } 627 } 628 skip=0; 629 } 630end: 631 s->in_handshake--; 632 if (buf != NULL) 633 BUF_MEM_free(buf); 634 if (cb != NULL) 635 cb(s,SSL_CB_CONNECT_EXIT,ret); 636 return(ret); 637 } 638 639 640int ssl3_client_hello(SSL *s) 641 { 642 unsigned char *buf; 643 unsigned char *p,*d; 644 int i; 645 unsigned long l; 646#ifndef OPENSSL_NO_COMP 647 int j; 648 SSL_COMP *comp; 649#endif 650 651 buf=(unsigned char *)s->init_buf->data; 652 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) 653 { 654 SSL_SESSION *sess = s->session; 655 if ((sess == NULL) || 656 (sess->ssl_version != s->version) || 657 !sess->session_id_length || 658 (sess->not_resumable)) 659 { 660 if (!ssl_get_new_session(s,0)) 661 goto err; 662 } 663 /* else use the pre-loaded session */ 664 665 p=s->s3->client_random; 666 667 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0) 668 goto err; 669 670 /* Do the message type and length last */ 671 d=p= &(buf[4]); 672 673 /* version indicates the negotiated version: for example from 674 * an SSLv2/v3 compatible client hello). The client_version 675 * field is the maximum version we permit and it is also 676 * used in RSA encrypted premaster secrets. Some servers can 677 * choke if we initially report a higher version then 678 * renegotiate to a lower one in the premaster secret. This 679 * didn't happen with TLS 1.0 as most servers supported it 680 * but it can with TLS 1.1 or later if the server only supports 681 * 1.0. 682 * 683 * Possible scenario with previous logic: 684 * 1. Client hello indicates TLS 1.2 685 * 2. Server hello says TLS 1.0 686 * 3. RSA encrypted premaster secret uses 1.2. 687 * 4. Handhaked proceeds using TLS 1.0. 688 * 5. Server sends hello request to renegotiate. 689 * 6. Client hello indicates TLS v1.0 as we now 690 * know that is maximum server supports. 691 * 7. Server chokes on RSA encrypted premaster secret 692 * containing version 1.0. 693 * 694 * For interoperability it should be OK to always use the 695 * maximum version we support in client hello and then rely 696 * on the checking of version to ensure the servers isn't 697 * being inconsistent: for example initially negotiating with 698 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using 699 * client_version in client hello and not resetting it to 700 * the negotiated version. 701 */ 702#if 0 703 *(p++)=s->version>>8; 704 *(p++)=s->version&0xff; 705 s->client_version=s->version; 706#else 707 *(p++)=s->client_version>>8; 708 *(p++)=s->client_version&0xff; 709#endif 710 711 /* Random stuff */ 712 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 713 p+=SSL3_RANDOM_SIZE; 714 715 /* Session ID */ 716 if (s->new_session) 717 i=0; 718 else 719 i=s->session->session_id_length; 720 *(p++)=i; 721 if (i != 0) 722 { 723 if (i > (int)sizeof(s->session->session_id)) 724 { 725 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 726 goto err; 727 } 728 memcpy(p,s->session->session_id,i); 729 p+=i; 730 } 731 732 /* Ciphers supported */ 733 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0); 734 if (i == 0) 735 { 736 SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 737 goto err; 738 } 739#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH 740 /* Some servers hang if client hello > 256 bytes 741 * as hack workaround chop number of supported ciphers 742 * to keep it well below this if we use TLS v1.2 743 */ 744 if (TLS1_get_version(s) >= TLS1_2_VERSION 745 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH) 746 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1; 747#endif 748 s2n(i,p); 749 p+=i; 750 751 /* COMPRESSION */ 752#ifdef OPENSSL_NO_COMP 753 *(p++)=1; 754#else 755 756 if ((s->options & SSL_OP_NO_COMPRESSION) 757 || !s->ctx->comp_methods) 758 j=0; 759 else 760 j=sk_SSL_COMP_num(s->ctx->comp_methods); 761 *(p++)=1+j; 762 for (i=0; i<j; i++) 763 { 764 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 765 *(p++)=comp->id; 766 } 767#endif 768 *(p++)=0; /* Add the NULL method */ 769 770#ifndef OPENSSL_NO_TLSEXT 771 /* TLS extensions*/ 772 if (ssl_prepare_clienthello_tlsext(s) <= 0) 773 { 774 SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT); 775 goto err; 776 } 777 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 778 { 779 SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 780 goto err; 781 } 782#endif 783 784 l=(p-d); 785 d=buf; 786 *(d++)=SSL3_MT_CLIENT_HELLO; 787 l2n3(l,d); 788 789 s->state=SSL3_ST_CW_CLNT_HELLO_B; 790 /* number of bytes to write */ 791 s->init_num=p-buf; 792 s->init_off=0; 793 } 794 795 /* SSL3_ST_CW_CLNT_HELLO_B */ 796 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); 797err: 798 return(-1); 799 } 800 801int ssl3_get_server_hello(SSL *s) 802 { 803 STACK_OF(SSL_CIPHER) *sk; 804 const SSL_CIPHER *c; 805 unsigned char *p,*d; 806 int i,al,ok; 807 unsigned int j; 808 long n; 809#ifndef OPENSSL_NO_COMP 810 SSL_COMP *comp; 811#endif 812 813 n=s->method->ssl_get_message(s, 814 SSL3_ST_CR_SRVR_HELLO_A, 815 SSL3_ST_CR_SRVR_HELLO_B, 816 -1, 817 20000, /* ?? */ 818 &ok); 819 820 if (!ok) return((int)n); 821 822 if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER) 823 { 824 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) 825 { 826 if ( s->d1->send_cookie == 0) 827 { 828 s->s3->tmp.reuse_message = 1; 829 return 1; 830 } 831 else /* already sent a cookie */ 832 { 833 al=SSL_AD_UNEXPECTED_MESSAGE; 834 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE); 835 goto f_err; 836 } 837 } 838 } 839 840 if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO) 841 { 842 al=SSL_AD_UNEXPECTED_MESSAGE; 843 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE); 844 goto f_err; 845 } 846 847 d=p=(unsigned char *)s->init_msg; 848 849 if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff))) 850 { 851 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION); 852 s->version=(s->version&0xff00)|p[1]; 853 al=SSL_AD_PROTOCOL_VERSION; 854 goto f_err; 855 } 856 p+=2; 857 858 /* load the server hello data */ 859 /* load the server random */ 860 memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE); 861 p+=SSL3_RANDOM_SIZE; 862 863 s->hit = 0; 864 865 /* get the session-id */ 866 j= *(p++); 867 868 if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE)) 869 { 870 al=SSL_AD_ILLEGAL_PARAMETER; 871 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG); 872 goto f_err; 873 } 874 875#ifndef OPENSSL_NO_TLSEXT 876 /* check if we want to resume the session based on external pre-shared secret */ 877 if (s->version >= TLS1_VERSION && s->tls_session_secret_cb) 878 { 879 SSL_CIPHER *pref_cipher=NULL; 880 s->session->master_key_length=sizeof(s->session->master_key); 881 if (s->tls_session_secret_cb(s, s->session->master_key, 882 &s->session->master_key_length, 883 NULL, &pref_cipher, 884 s->tls_session_secret_cb_arg)) 885 { 886 s->session->cipher = pref_cipher ? 887 pref_cipher : ssl_get_cipher_by_char(s, p+j); 888 s->hit = 1; 889 } 890 } 891#endif /* OPENSSL_NO_TLSEXT */ 892 893 if (!s->hit && j != 0 && j == s->session->session_id_length 894 && memcmp(p,s->session->session_id,j) == 0) 895 { 896 if(s->sid_ctx_length != s->session->sid_ctx_length 897 || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length)) 898 { 899 /* actually a client application bug */ 900 al=SSL_AD_ILLEGAL_PARAMETER; 901 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 902 goto f_err; 903 } 904 s->hit=1; 905 } 906 /* a miss or crap from the other end */ 907 if (!s->hit) 908 { 909 /* If we were trying for session-id reuse, make a new 910 * SSL_SESSION so we don't stuff up other people */ 911 if (s->session->session_id_length > 0) 912 { 913 if (!ssl_get_new_session(s,0)) 914 { 915 al=SSL_AD_INTERNAL_ERROR; 916 goto f_err; 917 } 918 } 919 s->session->session_id_length=j; 920 memcpy(s->session->session_id,p,j); /* j could be 0 */ 921 } 922 p+=j; 923 c=ssl_get_cipher_by_char(s,p); 924 if (c == NULL) 925 { 926 /* unknown cipher */ 927 al=SSL_AD_ILLEGAL_PARAMETER; 928 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED); 929 goto f_err; 930 } 931 /* TLS v1.2 only ciphersuites require v1.2 or later */ 932 if ((c->algorithm_ssl & SSL_TLSV1_2) && 933 (TLS1_get_version(s) < TLS1_2_VERSION)) 934 { 935 al=SSL_AD_ILLEGAL_PARAMETER; 936 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED); 937 goto f_err; 938 } 939#ifndef OPENSSL_NO_SRP 940 if (((c->algorithm_mkey & SSL_kSRP) || (c->algorithm_auth & SSL_aSRP)) && 941 !(s->srp_ctx.srp_Mask & SSL_kSRP)) 942 { 943 al=SSL_AD_ILLEGAL_PARAMETER; 944 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED); 945 goto f_err; 946 } 947#endif /* OPENSSL_NO_SRP */ 948 p+=ssl_put_cipher_by_char(s,NULL,NULL); 949 950 sk=ssl_get_ciphers_by_id(s); 951 i=sk_SSL_CIPHER_find(sk,c); 952 if (i < 0) 953 { 954 /* we did not say we would use this cipher */ 955 al=SSL_AD_ILLEGAL_PARAMETER; 956 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED); 957 goto f_err; 958 } 959 960 /* Depending on the session caching (internal/external), the cipher 961 and/or cipher_id values may not be set. Make sure that 962 cipher_id is set and use it for comparison. */ 963 if (s->session->cipher) 964 s->session->cipher_id = s->session->cipher->id; 965 if (s->hit && (s->session->cipher_id != c->id)) 966 { 967/* Workaround is now obsolete */ 968#if 0 969 if (!(s->options & 970 SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG)) 971#endif 972 { 973 al=SSL_AD_ILLEGAL_PARAMETER; 974 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 975 goto f_err; 976 } 977 } 978 s->s3->tmp.new_cipher=c; 979 /* Don't digest cached records if TLS v1.2: we may need them for 980 * client authentication. 981 */ 982 if (TLS1_get_version(s) < TLS1_2_VERSION && !ssl3_digest_cached_records(s)) 983 { 984 al = SSL_AD_INTERNAL_ERROR; 985 goto f_err; 986 } 987 /* lets get the compression algorithm */ 988 /* COMPRESSION */ 989#ifdef OPENSSL_NO_COMP 990 if (*(p++) != 0) 991 { 992 al=SSL_AD_ILLEGAL_PARAMETER; 993 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 994 goto f_err; 995 } 996 /* If compression is disabled we'd better not try to resume a session 997 * using compression. 998 */ 999 if (s->session->compress_meth != 0) 1000 { 1001 al=SSL_AD_INTERNAL_ERROR; 1002 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION); 1003 goto f_err; 1004 } 1005#else 1006 j= *(p++); 1007 if (s->hit && j != s->session->compress_meth) 1008 { 1009 al=SSL_AD_ILLEGAL_PARAMETER; 1010 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED); 1011 goto f_err; 1012 } 1013 if (j == 0) 1014 comp=NULL; 1015 else if (s->options & SSL_OP_NO_COMPRESSION) 1016 { 1017 al=SSL_AD_ILLEGAL_PARAMETER; 1018 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED); 1019 goto f_err; 1020 } 1021 else 1022 comp=ssl3_comp_find(s->ctx->comp_methods,j); 1023 1024 if ((j != 0) && (comp == NULL)) 1025 { 1026 al=SSL_AD_ILLEGAL_PARAMETER; 1027 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1028 goto f_err; 1029 } 1030 else 1031 { 1032 s->s3->tmp.new_compression=comp; 1033 } 1034#endif 1035 1036#ifndef OPENSSL_NO_TLSEXT 1037 /* TLS extensions*/ 1038 if (s->version >= SSL3_VERSION) 1039 { 1040 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al)) 1041 { 1042 /* 'al' set by ssl_parse_serverhello_tlsext */ 1043 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT); 1044 goto f_err; 1045 } 1046 if (ssl_check_serverhello_tlsext(s) <= 0) 1047 { 1048 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT); 1049 goto err; 1050 } 1051 } 1052#endif 1053 1054 if (p != (d+n)) 1055 { 1056 /* wrong packet length */ 1057 al=SSL_AD_DECODE_ERROR; 1058 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH); 1059 goto f_err; 1060 } 1061 1062 return(1); 1063f_err: 1064 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1065err: 1066 return(-1); 1067 } 1068 1069int ssl3_get_server_certificate(SSL *s) 1070 { 1071 int al,i,ok,ret= -1; 1072 unsigned long n,nc,llen,l; 1073 X509 *x=NULL; 1074 const unsigned char *q,*p; 1075 unsigned char *d; 1076 STACK_OF(X509) *sk=NULL; 1077 SESS_CERT *sc; 1078 EVP_PKEY *pkey=NULL; 1079 int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */ 1080 1081 n=s->method->ssl_get_message(s, 1082 SSL3_ST_CR_CERT_A, 1083 SSL3_ST_CR_CERT_B, 1084 -1, 1085 s->max_cert_list, 1086 &ok); 1087 1088 if (!ok) return((int)n); 1089 1090 if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) || 1091 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) && 1092 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE))) 1093 { 1094 s->s3->tmp.reuse_message=1; 1095 return(1); 1096 } 1097 1098 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE) 1099 { 1100 al=SSL_AD_UNEXPECTED_MESSAGE; 1101 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE); 1102 goto f_err; 1103 } 1104 p=d=(unsigned char *)s->init_msg; 1105 1106 if ((sk=sk_X509_new_null()) == NULL) 1107 { 1108 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE); 1109 goto err; 1110 } 1111 1112 n2l3(p,llen); 1113 if (llen+3 != n) 1114 { 1115 al=SSL_AD_DECODE_ERROR; 1116 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH); 1117 goto f_err; 1118 } 1119 for (nc=0; nc<llen; ) 1120 { 1121 n2l3(p,l); 1122 if ((l+nc+3) > llen) 1123 { 1124 al=SSL_AD_DECODE_ERROR; 1125 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH); 1126 goto f_err; 1127 } 1128 1129 q=p; 1130 x=d2i_X509(NULL,&q,l); 1131 if (x == NULL) 1132 { 1133 al=SSL_AD_BAD_CERTIFICATE; 1134 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB); 1135 goto f_err; 1136 } 1137 if (q != (p+l)) 1138 { 1139 al=SSL_AD_DECODE_ERROR; 1140 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH); 1141 goto f_err; 1142 } 1143 if (!sk_X509_push(sk,x)) 1144 { 1145 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE); 1146 goto err; 1147 } 1148 x=NULL; 1149 nc+=l+3; 1150 p=q; 1151 } 1152 1153 i=ssl_verify_cert_chain(s,sk); 1154 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0) 1155#ifndef OPENSSL_NO_KRB5 1156 && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) && 1157 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)) 1158#endif /* OPENSSL_NO_KRB5 */ 1159 ) 1160 { 1161 al=ssl_verify_alarm_type(s->verify_result); 1162 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED); 1163 goto f_err; 1164 } 1165 ERR_clear_error(); /* but we keep s->verify_result */ 1166 1167 sc=ssl_sess_cert_new(); 1168 if (sc == NULL) goto err; 1169 1170 if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert); 1171 s->session->sess_cert=sc; 1172 1173 sc->cert_chain=sk; 1174 /* Inconsistency alert: cert_chain does include the peer's 1175 * certificate, which we don't include in s3_srvr.c */ 1176 x=sk_X509_value(sk,0); 1177 sk=NULL; 1178 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1179 1180 pkey=X509_get_pubkey(x); 1181 1182 /* VRS: allow null cert if auth == KRB5 */ 1183 need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) && 1184 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)) 1185 ? 0 : 1; 1186 1187#ifdef KSSL_DEBUG 1188 fprintf(stderr,"pkey,x = %p, %p\n", pkey,x); 1189 fprintf(stderr,"ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey)); 1190 fprintf(stderr,"cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name, 1191 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert); 1192#endif /* KSSL_DEBUG */ 1193 1194 if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey))) 1195 { 1196 x=NULL; 1197 al=SSL3_AL_FATAL; 1198 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, 1199 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1200 goto f_err; 1201 } 1202 1203 i=ssl_cert_type(x,pkey); 1204 if (need_cert && i < 0) 1205 { 1206 x=NULL; 1207 al=SSL3_AL_FATAL; 1208 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, 1209 SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1210 goto f_err; 1211 } 1212 1213 if (need_cert) 1214 { 1215 sc->peer_cert_type=i; 1216 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509); 1217 /* Why would the following ever happen? 1218 * We just created sc a couple of lines ago. */ 1219 if (sc->peer_pkeys[i].x509 != NULL) 1220 X509_free(sc->peer_pkeys[i].x509); 1221 sc->peer_pkeys[i].x509=x; 1222 sc->peer_key= &(sc->peer_pkeys[i]); 1223 1224 if (s->session->peer != NULL) 1225 X509_free(s->session->peer); 1226 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509); 1227 s->session->peer=x; 1228 } 1229 else 1230 { 1231 sc->peer_cert_type=i; 1232 sc->peer_key= NULL; 1233 1234 if (s->session->peer != NULL) 1235 X509_free(s->session->peer); 1236 s->session->peer=NULL; 1237 } 1238 s->session->verify_result = s->verify_result; 1239 1240 x=NULL; 1241 ret=1; 1242 1243 if (0) 1244 { 1245f_err: 1246 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1247 } 1248err: 1249 EVP_PKEY_free(pkey); 1250 X509_free(x); 1251 sk_X509_pop_free(sk,X509_free); 1252 return(ret); 1253 } 1254 1255int ssl3_get_key_exchange(SSL *s) 1256 { 1257#ifndef OPENSSL_NO_RSA 1258 unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2]; 1259#endif 1260 EVP_MD_CTX md_ctx; 1261 unsigned char *param,*p; 1262 int al,j,ok; 1263 long i,param_len,n,alg_k,alg_a; 1264 EVP_PKEY *pkey=NULL; 1265 const EVP_MD *md = NULL; 1266#ifndef OPENSSL_NO_RSA 1267 RSA *rsa=NULL; 1268#endif 1269#ifndef OPENSSL_NO_DH 1270 DH *dh=NULL; 1271#endif 1272#ifndef OPENSSL_NO_ECDH 1273 EC_KEY *ecdh = NULL; 1274 BN_CTX *bn_ctx = NULL; 1275 EC_POINT *srvr_ecpoint = NULL; 1276 int curve_nid = 0; 1277 int encoded_pt_len = 0; 1278#endif 1279 1280 EVP_MD_CTX_init(&md_ctx); 1281 1282 /* use same message size as in ssl3_get_certificate_request() 1283 * as ServerKeyExchange message may be skipped */ 1284 n=s->method->ssl_get_message(s, 1285 SSL3_ST_CR_KEY_EXCH_A, 1286 SSL3_ST_CR_KEY_EXCH_B, 1287 -1, 1288 s->max_cert_list, 1289 &ok); 1290 if (!ok) return((int)n); 1291 1292 alg_k=s->s3->tmp.new_cipher->algorithm_mkey; 1293 1294 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) 1295 { 1296 /* 1297 * Can't skip server key exchange if this is an ephemeral 1298 * ciphersuite. 1299 */ 1300 if (alg_k & (SSL_kEDH|SSL_kEECDH)) 1301 { 1302 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE); 1303 al = SSL_AD_UNEXPECTED_MESSAGE; 1304 goto f_err; 1305 } 1306#ifndef OPENSSL_NO_PSK 1307 /* In plain PSK ciphersuite, ServerKeyExchange can be 1308 omitted if no identity hint is sent. Set 1309 session->sess_cert anyway to avoid problems 1310 later.*/ 1311 if (alg_k & SSL_kPSK) 1312 { 1313 s->session->sess_cert=ssl_sess_cert_new(); 1314 if (s->ctx->psk_identity_hint) 1315 OPENSSL_free(s->ctx->psk_identity_hint); 1316 s->ctx->psk_identity_hint = NULL; 1317 } 1318#endif 1319 s->s3->tmp.reuse_message=1; 1320 return(1); 1321 } 1322 1323 param=p=(unsigned char *)s->init_msg; 1324 if (s->session->sess_cert != NULL) 1325 { 1326#ifndef OPENSSL_NO_RSA 1327 if (s->session->sess_cert->peer_rsa_tmp != NULL) 1328 { 1329 RSA_free(s->session->sess_cert->peer_rsa_tmp); 1330 s->session->sess_cert->peer_rsa_tmp=NULL; 1331 } 1332#endif 1333#ifndef OPENSSL_NO_DH 1334 if (s->session->sess_cert->peer_dh_tmp) 1335 { 1336 DH_free(s->session->sess_cert->peer_dh_tmp); 1337 s->session->sess_cert->peer_dh_tmp=NULL; 1338 } 1339#endif 1340#ifndef OPENSSL_NO_ECDH 1341 if (s->session->sess_cert->peer_ecdh_tmp) 1342 { 1343 EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp); 1344 s->session->sess_cert->peer_ecdh_tmp=NULL; 1345 } 1346#endif 1347 } 1348 else 1349 { 1350 s->session->sess_cert=ssl_sess_cert_new(); 1351 } 1352 1353 /* Total length of the parameters including the length prefix */ 1354 param_len=0; 1355 1356 alg_a=s->s3->tmp.new_cipher->algorithm_auth; 1357 1358 al=SSL_AD_DECODE_ERROR; 1359 1360#ifndef OPENSSL_NO_PSK 1361 if (alg_k & SSL_kPSK) 1362 { 1363 param_len = 2; 1364 if (param_len > n) 1365 { 1366 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1367 SSL_R_LENGTH_TOO_SHORT); 1368 goto f_err; 1369 } 1370 n2s(p,i); 1371 1372 /* Store PSK identity hint for later use, hint is used 1373 * in ssl3_send_client_key_exchange. Assume that the 1374 * maximum length of a PSK identity hint can be as 1375 * long as the maximum length of a PSK identity. */ 1376 if (i > PSK_MAX_IDENTITY_LEN) 1377 { 1378 al=SSL_AD_HANDSHAKE_FAILURE; 1379 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1380 SSL_R_DATA_LENGTH_TOO_LONG); 1381 goto f_err; 1382 } 1383 if (i > n - param_len) 1384 { 1385 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1386 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH); 1387 goto f_err; 1388 } 1389 param_len += i; 1390 1391 s->session->psk_identity_hint = BUF_strndup((char *)p, i); 1392 if (s->session->psk_identity_hint == NULL) 1393 { 1394 al=SSL_AD_HANDSHAKE_FAILURE; 1395 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); 1396 goto f_err; 1397 } 1398 1399 p+=i; 1400 n-=param_len; 1401 } 1402 else 1403#endif /* !OPENSSL_NO_PSK */ 1404#ifndef OPENSSL_NO_SRP 1405 if (alg_k & SSL_kSRP) 1406 { 1407 param_len = 2; 1408 if (param_len > n) 1409 { 1410 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1411 SSL_R_LENGTH_TOO_SHORT); 1412 goto f_err; 1413 } 1414 n2s(p,i); 1415 1416 if (i > n - param_len) 1417 { 1418 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH); 1419 goto f_err; 1420 } 1421 param_len += i; 1422 1423 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL))) 1424 { 1425 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1426 goto err; 1427 } 1428 p+=i; 1429 1430 1431 if (2 > n - param_len) 1432 { 1433 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1434 SSL_R_LENGTH_TOO_SHORT); 1435 goto f_err; 1436 } 1437 param_len += 2; 1438 1439 n2s(p,i); 1440 1441 if (i > n - param_len) 1442 { 1443 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH); 1444 goto f_err; 1445 } 1446 param_len += i; 1447 1448 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL))) 1449 { 1450 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1451 goto err; 1452 } 1453 p+=i; 1454 1455 1456 if (1 > n - param_len) 1457 { 1458 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1459 SSL_R_LENGTH_TOO_SHORT); 1460 goto f_err; 1461 } 1462 param_len += 1; 1463 1464 i = (unsigned int)(p[0]); 1465 p++; 1466 1467 if (i > n - param_len) 1468 { 1469 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH); 1470 goto f_err; 1471 } 1472 param_len += i; 1473 1474 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL))) 1475 { 1476 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1477 goto err; 1478 } 1479 p+=i; 1480 1481 if (2 > n - param_len) 1482 { 1483 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1484 SSL_R_LENGTH_TOO_SHORT); 1485 goto f_err; 1486 } 1487 param_len += 2; 1488 1489 n2s(p,i); 1490 1491 if (i > n - param_len) 1492 { 1493 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH); 1494 goto f_err; 1495 } 1496 param_len += i; 1497 1498 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL))) 1499 { 1500 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1501 goto err; 1502 } 1503 p+=i; 1504 n-=param_len; 1505 1506 if (!srp_verify_server_param(s, &al)) 1507 { 1508 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS); 1509 goto f_err; 1510 } 1511 1512/* We must check if there is a certificate */ 1513#ifndef OPENSSL_NO_RSA 1514 if (alg_a & SSL_aRSA) 1515 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1516#else 1517 if (0) 1518 ; 1519#endif 1520#ifndef OPENSSL_NO_DSA 1521 else if (alg_a & SSL_aDSS) 1522 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509); 1523#endif 1524 } 1525 else 1526#endif /* !OPENSSL_NO_SRP */ 1527#ifndef OPENSSL_NO_RSA 1528 if (alg_k & SSL_kRSA) 1529 { 1530 /* Temporary RSA keys only allowed in export ciphersuites */ 1531 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) 1532 { 1533 al=SSL_AD_UNEXPECTED_MESSAGE; 1534 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE); 1535 goto f_err; 1536 } 1537 if ((rsa=RSA_new()) == NULL) 1538 { 1539 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1540 goto err; 1541 } 1542 1543 param_len = 2; 1544 if (param_len > n) 1545 { 1546 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1547 SSL_R_LENGTH_TOO_SHORT); 1548 goto f_err; 1549 } 1550 n2s(p,i); 1551 1552 if (i > n - param_len) 1553 { 1554 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH); 1555 goto f_err; 1556 } 1557 param_len += i; 1558 1559 if (!(rsa->n=BN_bin2bn(p,i,rsa->n))) 1560 { 1561 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1562 goto err; 1563 } 1564 p+=i; 1565 1566 if (2 > n - param_len) 1567 { 1568 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1569 SSL_R_LENGTH_TOO_SHORT); 1570 goto f_err; 1571 } 1572 param_len += 2; 1573 1574 n2s(p,i); 1575 1576 if (i > n - param_len) 1577 { 1578 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH); 1579 goto f_err; 1580 } 1581 param_len += i; 1582 1583 if (!(rsa->e=BN_bin2bn(p,i,rsa->e))) 1584 { 1585 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1586 goto err; 1587 } 1588 p+=i; 1589 n-=param_len; 1590 1591 /* this should be because we are using an export cipher */ 1592 if (alg_a & SSL_aRSA) 1593 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1594 else 1595 { 1596 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1597 goto err; 1598 } 1599 1600 if (EVP_PKEY_bits(pkey) <= SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) { 1601 al = SSL_AD_UNEXPECTED_MESSAGE; 1602 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE); 1603 goto f_err; 1604 } 1605 1606 s->session->sess_cert->peer_rsa_tmp=rsa; 1607 rsa=NULL; 1608 } 1609#else /* OPENSSL_NO_RSA */ 1610 if (0) 1611 ; 1612#endif 1613#ifndef OPENSSL_NO_DH 1614 else if (alg_k & SSL_kEDH) 1615 { 1616 if ((dh=DH_new()) == NULL) 1617 { 1618 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB); 1619 goto err; 1620 } 1621 1622 param_len = 2; 1623 if (param_len > n) 1624 { 1625 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1626 SSL_R_LENGTH_TOO_SHORT); 1627 goto f_err; 1628 } 1629 n2s(p,i); 1630 1631 if (i > n - param_len) 1632 { 1633 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH); 1634 goto f_err; 1635 } 1636 param_len += i; 1637 1638 if (!(dh->p=BN_bin2bn(p,i,NULL))) 1639 { 1640 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1641 goto err; 1642 } 1643 p+=i; 1644 1645 if (2 > n - param_len) 1646 { 1647 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1648 SSL_R_LENGTH_TOO_SHORT); 1649 goto f_err; 1650 } 1651 param_len += 2; 1652 1653 n2s(p,i); 1654 1655 if (i > n - param_len) 1656 { 1657 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH); 1658 goto f_err; 1659 } 1660 param_len += i; 1661 1662 if (!(dh->g=BN_bin2bn(p,i,NULL))) 1663 { 1664 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1665 goto err; 1666 } 1667 p+=i; 1668 1669 if (2 > n - param_len) 1670 { 1671 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1672 SSL_R_LENGTH_TOO_SHORT); 1673 goto f_err; 1674 } 1675 param_len += 2; 1676 1677 n2s(p,i); 1678 1679 if (i > n - param_len) 1680 { 1681 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH); 1682 goto f_err; 1683 } 1684 param_len += i; 1685 1686 if (!(dh->pub_key=BN_bin2bn(p,i,NULL))) 1687 { 1688 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1689 goto err; 1690 } 1691 p+=i; 1692 n-=param_len; 1693 1694#ifndef OPENSSL_NO_RSA 1695 if (alg_a & SSL_aRSA) 1696 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1697#else 1698 if (0) 1699 ; 1700#endif 1701#ifndef OPENSSL_NO_DSA 1702 else if (alg_a & SSL_aDSS) 1703 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509); 1704#endif 1705 /* else anonymous DH, so no certificate or pkey. */ 1706 1707 s->session->sess_cert->peer_dh_tmp=dh; 1708 dh=NULL; 1709 } 1710 else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd)) 1711 { 1712 al=SSL_AD_ILLEGAL_PARAMETER; 1713 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER); 1714 goto f_err; 1715 } 1716#endif /* !OPENSSL_NO_DH */ 1717 1718#ifndef OPENSSL_NO_ECDH 1719 else if (alg_k & SSL_kEECDH) 1720 { 1721 EC_GROUP *ngroup; 1722 const EC_GROUP *group; 1723 1724 if ((ecdh=EC_KEY_new()) == NULL) 1725 { 1726 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1727 goto err; 1728 } 1729 1730 /* Extract elliptic curve parameters and the 1731 * server's ephemeral ECDH public key. 1732 * Keep accumulating lengths of various components in 1733 * param_len and make sure it never exceeds n. 1734 */ 1735 1736 /* XXX: For now we only support named (not generic) curves 1737 * and the ECParameters in this case is just three bytes. We 1738 * also need one byte for the length of the encoded point 1739 */ 1740 param_len=4; 1741 if (param_len > n) 1742 { 1743 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1744 SSL_R_LENGTH_TOO_SHORT); 1745 goto f_err; 1746 } 1747 1748 if ((*p != NAMED_CURVE_TYPE) || 1749 ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)) 1750 { 1751 al=SSL_AD_INTERNAL_ERROR; 1752 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1753 goto f_err; 1754 } 1755 1756 ngroup = EC_GROUP_new_by_curve_name(curve_nid); 1757 if (ngroup == NULL) 1758 { 1759 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB); 1760 goto err; 1761 } 1762 if (EC_KEY_set_group(ecdh, ngroup) == 0) 1763 { 1764 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB); 1765 goto err; 1766 } 1767 EC_GROUP_free(ngroup); 1768 1769 group = EC_KEY_get0_group(ecdh); 1770 1771 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 1772 (EC_GROUP_get_degree(group) > 163)) 1773 { 1774 al=SSL_AD_EXPORT_RESTRICTION; 1775 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER); 1776 goto f_err; 1777 } 1778 1779 p+=3; 1780 1781 /* Next, get the encoded ECPoint */ 1782 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) || 1783 ((bn_ctx = BN_CTX_new()) == NULL)) 1784 { 1785 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1786 goto err; 1787 } 1788 1789 encoded_pt_len = *p; /* length of encoded point */ 1790 p+=1; 1791 1792 if ((encoded_pt_len > n - param_len) || 1793 (EC_POINT_oct2point(group, srvr_ecpoint, 1794 p, encoded_pt_len, bn_ctx) == 0)) 1795 { 1796 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT); 1797 goto f_err; 1798 } 1799 param_len += encoded_pt_len; 1800 1801 n-=param_len; 1802 p+=encoded_pt_len; 1803 1804 /* The ECC/TLS specification does not mention 1805 * the use of DSA to sign ECParameters in the server 1806 * key exchange message. We do support RSA and ECDSA. 1807 */ 1808 if (0) ; 1809#ifndef OPENSSL_NO_RSA 1810 else if (alg_a & SSL_aRSA) 1811 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1812#endif 1813#ifndef OPENSSL_NO_ECDSA 1814 else if (alg_a & SSL_aECDSA) 1815 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1816#endif 1817 /* else anonymous ECDH, so no certificate or pkey. */ 1818 EC_KEY_set_public_key(ecdh, srvr_ecpoint); 1819 s->session->sess_cert->peer_ecdh_tmp=ecdh; 1820 ecdh=NULL; 1821 BN_CTX_free(bn_ctx); 1822 bn_ctx = NULL; 1823 EC_POINT_free(srvr_ecpoint); 1824 srvr_ecpoint = NULL; 1825 } 1826 else if (alg_k) 1827 { 1828 al=SSL_AD_UNEXPECTED_MESSAGE; 1829 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE); 1830 goto f_err; 1831 } 1832#endif /* !OPENSSL_NO_ECDH */ 1833 1834 1835 /* p points to the next byte, there are 'n' bytes left */ 1836 1837 /* if it was signed, check the signature */ 1838 if (pkey != NULL) 1839 { 1840 if (TLS1_get_version(s) >= TLS1_2_VERSION) 1841 { 1842 int sigalg; 1843 if (2 > n) 1844 { 1845 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1846 SSL_R_LENGTH_TOO_SHORT); 1847 goto f_err; 1848 } 1849 1850 sigalg = tls12_get_sigid(pkey); 1851 /* Should never happen */ 1852 if (sigalg == -1) 1853 { 1854 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1855 goto err; 1856 } 1857 /* Check key type is consistent with signature */ 1858 if (sigalg != (int)p[1]) 1859 { 1860 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_TYPE); 1861 al=SSL_AD_DECODE_ERROR; 1862 goto f_err; 1863 } 1864 md = tls12_get_hash(p[0]); 1865 if (md == NULL) 1866 { 1867 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNKNOWN_DIGEST); 1868 goto f_err; 1869 } 1870#ifdef SSL_DEBUG 1871fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md)); 1872#endif 1873 p += 2; 1874 n -= 2; 1875 } 1876 else 1877 md = EVP_sha1(); 1878 1879 if (2 > n) 1880 { 1881 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1882 SSL_R_LENGTH_TOO_SHORT); 1883 goto f_err; 1884 } 1885 n2s(p,i); 1886 n-=2; 1887 j=EVP_PKEY_size(pkey); 1888 1889 /* Check signature length. If n is 0 then signature is empty */ 1890 if ((i != n) || (n > j) || (n <= 0)) 1891 { 1892 /* wrong packet length */ 1893 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH); 1894 goto f_err; 1895 } 1896 1897#ifndef OPENSSL_NO_RSA 1898 if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION) 1899 { 1900 int num; 1901 unsigned int size; 1902 1903 j=0; 1904 q=md_buf; 1905 for (num=2; num > 0; num--) 1906 { 1907 EVP_MD_CTX_set_flags(&md_ctx, 1908 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 1909 EVP_DigestInit_ex(&md_ctx,(num == 2) 1910 ?s->ctx->md5:s->ctx->sha1, NULL); 1911 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1912 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1913 EVP_DigestUpdate(&md_ctx,param,param_len); 1914 EVP_DigestFinal_ex(&md_ctx,q,&size); 1915 q+=size; 1916 j+=size; 1917 } 1918 i=RSA_verify(NID_md5_sha1, md_buf, j, p, n, 1919 pkey->pkey.rsa); 1920 if (i < 0) 1921 { 1922 al=SSL_AD_DECRYPT_ERROR; 1923 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); 1924 goto f_err; 1925 } 1926 if (i == 0) 1927 { 1928 /* bad signature */ 1929 al=SSL_AD_DECRYPT_ERROR; 1930 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE); 1931 goto f_err; 1932 } 1933 } 1934 else 1935#endif 1936 { 1937 EVP_VerifyInit_ex(&md_ctx, md, NULL); 1938 EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1939 EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1940 EVP_VerifyUpdate(&md_ctx,param,param_len); 1941 if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0) 1942 { 1943 /* bad signature */ 1944 al=SSL_AD_DECRYPT_ERROR; 1945 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE); 1946 goto f_err; 1947 } 1948 } 1949 } 1950 else 1951 { 1952 /* aNULL, aSRP or kPSK do not need public keys */ 1953 if (!(alg_a & (SSL_aNULL|SSL_aSRP)) && !(alg_k & SSL_kPSK)) 1954 { 1955 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1956 goto err; 1957 } 1958 /* still data left over */ 1959 if (n != 0) 1960 { 1961 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE); 1962 goto f_err; 1963 } 1964 } 1965 EVP_PKEY_free(pkey); 1966 EVP_MD_CTX_cleanup(&md_ctx); 1967 return(1); 1968f_err: 1969 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1970err: 1971 EVP_PKEY_free(pkey); 1972#ifndef OPENSSL_NO_RSA 1973 if (rsa != NULL) 1974 RSA_free(rsa); 1975#endif 1976#ifndef OPENSSL_NO_DH 1977 if (dh != NULL) 1978 DH_free(dh); 1979#endif 1980#ifndef OPENSSL_NO_ECDH 1981 BN_CTX_free(bn_ctx); 1982 EC_POINT_free(srvr_ecpoint); 1983 if (ecdh != NULL) 1984 EC_KEY_free(ecdh); 1985#endif 1986 EVP_MD_CTX_cleanup(&md_ctx); 1987 return(-1); 1988 } 1989 1990int ssl3_get_certificate_request(SSL *s) 1991 { 1992 int ok,ret=0; 1993 unsigned long n,nc,l; 1994 unsigned int llen, ctype_num,i; 1995 X509_NAME *xn=NULL; 1996 const unsigned char *p,*q; 1997 unsigned char *d; 1998 STACK_OF(X509_NAME) *ca_sk=NULL; 1999 2000 n=s->method->ssl_get_message(s, 2001 SSL3_ST_CR_CERT_REQ_A, 2002 SSL3_ST_CR_CERT_REQ_B, 2003 -1, 2004 s->max_cert_list, 2005 &ok); 2006 2007 if (!ok) return((int)n); 2008 2009 s->s3->tmp.cert_req=0; 2010 2011 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE) 2012 { 2013 s->s3->tmp.reuse_message=1; 2014 /* If we get here we don't need any cached handshake records 2015 * as we wont be doing client auth. 2016 */ 2017 if (s->s3->handshake_buffer) 2018 { 2019 if (!ssl3_digest_cached_records(s)) 2020 goto err; 2021 } 2022 return(1); 2023 } 2024 2025 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) 2026 { 2027 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 2028 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE); 2029 goto err; 2030 } 2031 2032 /* TLS does not like anon-DH with client cert */ 2033 if (s->version > SSL3_VERSION) 2034 { 2035 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 2036 { 2037 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 2038 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 2039 goto err; 2040 } 2041 } 2042 2043 p=d=(unsigned char *)s->init_msg; 2044 2045 if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL) 2046 { 2047 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE); 2048 goto err; 2049 } 2050 2051 /* get the certificate types */ 2052 ctype_num= *(p++); 2053 if (ctype_num > SSL3_CT_NUMBER) 2054 ctype_num=SSL3_CT_NUMBER; 2055 for (i=0; i<ctype_num; i++) 2056 s->s3->tmp.ctype[i]= p[i]; 2057 p+=ctype_num; 2058 if (TLS1_get_version(s) >= TLS1_2_VERSION) 2059 { 2060 n2s(p, llen); 2061 /* Check we have enough room for signature algorithms and 2062 * following length value. 2063 */ 2064 if ((unsigned long)(p - d + llen + 2) > n) 2065 { 2066 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 2067 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG); 2068 goto err; 2069 } 2070 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen)) 2071 { 2072 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 2073 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2074 goto err; 2075 } 2076 p += llen; 2077 } 2078 2079 /* get the CA RDNs */ 2080 n2s(p,llen); 2081#if 0 2082{ 2083FILE *out; 2084out=fopen("/tmp/vsign.der","w"); 2085fwrite(p,1,llen,out); 2086fclose(out); 2087} 2088#endif 2089 2090 if ((unsigned long)(p - d + llen) != n) 2091 { 2092 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 2093 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH); 2094 goto err; 2095 } 2096 2097 for (nc=0; nc<llen; ) 2098 { 2099 n2s(p,l); 2100 if ((l+nc+2) > llen) 2101 { 2102 if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) 2103 goto cont; /* netscape bugs */ 2104 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 2105 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG); 2106 goto err; 2107 } 2108 2109 q=p; 2110 2111 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL) 2112 { 2113 /* If netscape tolerance is on, ignore errors */ 2114 if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG) 2115 goto cont; 2116 else 2117 { 2118 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 2119 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB); 2120 goto err; 2121 } 2122 } 2123 2124 if (q != (p+l)) 2125 { 2126 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 2127 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH); 2128 goto err; 2129 } 2130 if (!sk_X509_NAME_push(ca_sk,xn)) 2131 { 2132 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE); 2133 goto err; 2134 } 2135 2136 p+=l; 2137 nc+=l+2; 2138 } 2139 2140 if (0) 2141 { 2142cont: 2143 ERR_clear_error(); 2144 } 2145 2146 /* we should setup a certificate to return.... */ 2147 s->s3->tmp.cert_req=1; 2148 s->s3->tmp.ctype_num=ctype_num; 2149 if (s->s3->tmp.ca_names != NULL) 2150 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free); 2151 s->s3->tmp.ca_names=ca_sk; 2152 ca_sk=NULL; 2153 2154 ret=1; 2155err: 2156 if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free); 2157 return(ret); 2158 } 2159 2160static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 2161 { 2162 return(X509_NAME_cmp(*a,*b)); 2163 } 2164#ifndef OPENSSL_NO_TLSEXT 2165int ssl3_get_new_session_ticket(SSL *s) 2166 { 2167 int ok,al,ret=0, ticklen; 2168 long n; 2169 const unsigned char *p; 2170 unsigned char *d; 2171 2172 n=s->method->ssl_get_message(s, 2173 SSL3_ST_CR_SESSION_TICKET_A, 2174 SSL3_ST_CR_SESSION_TICKET_B, 2175 SSL3_MT_NEWSESSION_TICKET, 2176 16384, 2177 &ok); 2178 2179 if (!ok) 2180 return((int)n); 2181 2182 if (n < 6) 2183 { 2184 /* need at least ticket_lifetime_hint + ticket length */ 2185 al = SSL_AD_DECODE_ERROR; 2186 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH); 2187 goto f_err; 2188 } 2189 2190 p = d = (unsigned char *)s->init_msg; 2191 2192 if (s->session->session_id_length > 0) { 2193 int i = s->session_ctx->session_cache_mode; 2194 SSL_SESSION *new_sess; 2195 /* 2196 * We reused an existing session, so we need to replace it with a new 2197 * one 2198 */ 2199 if (i & SSL_SESS_CACHE_CLIENT) { 2200 /* 2201 * Remove the old session from the cache 2202 */ 2203 if (i & SSL_SESS_CACHE_NO_INTERNAL_STORE) { 2204 if (s->session_ctx->remove_session_cb != NULL) 2205 s->session_ctx->remove_session_cb(s->session_ctx, 2206 s->session); 2207 } else { 2208 /* We carry on if this fails */ 2209 SSL_CTX_remove_session(s->session_ctx, s->session); 2210 } 2211 } 2212 2213 if ((new_sess = ssl_session_dup(s->session, 0)) == 0) { 2214 al = SSL_AD_INTERNAL_ERROR; 2215 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE); 2216 goto f_err; 2217 } 2218 2219 SSL_SESSION_free(s->session); 2220 s->session = new_sess; 2221 } 2222 2223 n2l(p, s->session->tlsext_tick_lifetime_hint); 2224 n2s(p, ticklen); 2225 /* ticket_lifetime_hint + ticket_length + ticket */ 2226 if (ticklen + 6 != n) 2227 { 2228 al = SSL_AD_DECODE_ERROR; 2229 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH); 2230 goto f_err; 2231 } 2232 if (s->session->tlsext_tick) 2233 { 2234 OPENSSL_free(s->session->tlsext_tick); 2235 s->session->tlsext_ticklen = 0; 2236 } 2237 s->session->tlsext_tick = OPENSSL_malloc(ticklen); 2238 if (!s->session->tlsext_tick) 2239 { 2240 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE); 2241 goto err; 2242 } 2243 memcpy(s->session->tlsext_tick, p, ticklen); 2244 s->session->tlsext_ticklen = ticklen; 2245 /* There are two ways to detect a resumed ticket session. 2246 * One is to set an appropriate session ID and then the server 2247 * must return a match in ServerHello. This allows the normal 2248 * client session ID matching to work and we know much 2249 * earlier that the ticket has been accepted. 2250 * 2251 * The other way is to set zero length session ID when the 2252 * ticket is presented and rely on the handshake to determine 2253 * session resumption. 2254 * 2255 * We choose the former approach because this fits in with 2256 * assumptions elsewhere in OpenSSL. The session ID is set 2257 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 2258 * ticket. 2259 */ 2260 EVP_Digest(p, ticklen, 2261 s->session->session_id, &s->session->session_id_length, 2262#ifndef OPENSSL_NO_SHA256 2263 EVP_sha256(), NULL); 2264#else 2265 EVP_sha1(), NULL); 2266#endif 2267 ret=1; 2268 return(ret); 2269f_err: 2270 ssl3_send_alert(s,SSL3_AL_FATAL,al); 2271err: 2272 return(-1); 2273 } 2274 2275int ssl3_get_cert_status(SSL *s) 2276 { 2277 int ok, al; 2278 unsigned long resplen,n; 2279 const unsigned char *p; 2280 2281 n=s->method->ssl_get_message(s, 2282 SSL3_ST_CR_CERT_STATUS_A, 2283 SSL3_ST_CR_CERT_STATUS_B, 2284 SSL3_MT_CERTIFICATE_STATUS, 2285 16384, 2286 &ok); 2287 2288 if (!ok) return((int)n); 2289 if (n < 4) 2290 { 2291 /* need at least status type + length */ 2292 al = SSL_AD_DECODE_ERROR; 2293 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH); 2294 goto f_err; 2295 } 2296 p = (unsigned char *)s->init_msg; 2297 if (*p++ != TLSEXT_STATUSTYPE_ocsp) 2298 { 2299 al = SSL_AD_DECODE_ERROR; 2300 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE); 2301 goto f_err; 2302 } 2303 n2l3(p, resplen); 2304 if (resplen + 4 != n) 2305 { 2306 al = SSL_AD_DECODE_ERROR; 2307 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH); 2308 goto f_err; 2309 } 2310 if (s->tlsext_ocsp_resp) 2311 OPENSSL_free(s->tlsext_ocsp_resp); 2312 s->tlsext_ocsp_resp = BUF_memdup(p, resplen); 2313 if (!s->tlsext_ocsp_resp) 2314 { 2315 al = SSL_AD_INTERNAL_ERROR; 2316 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE); 2317 goto f_err; 2318 } 2319 s->tlsext_ocsp_resplen = resplen; 2320 if (s->ctx->tlsext_status_cb) 2321 { 2322 int ret; 2323 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); 2324 if (ret == 0) 2325 { 2326 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 2327 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE); 2328 goto f_err; 2329 } 2330 if (ret < 0) 2331 { 2332 al = SSL_AD_INTERNAL_ERROR; 2333 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE); 2334 goto f_err; 2335 } 2336 } 2337 return 1; 2338f_err: 2339 ssl3_send_alert(s,SSL3_AL_FATAL,al); 2340 return(-1); 2341 } 2342#endif 2343 2344int ssl3_get_server_done(SSL *s) 2345 { 2346 int ok,ret=0; 2347 long n; 2348 2349 n=s->method->ssl_get_message(s, 2350 SSL3_ST_CR_SRVR_DONE_A, 2351 SSL3_ST_CR_SRVR_DONE_B, 2352 SSL3_MT_SERVER_DONE, 2353 30, /* should be very small, like 0 :-) */ 2354 &ok); 2355 2356 if (!ok) return((int)n); 2357 if (n > 0) 2358 { 2359 /* should contain no data */ 2360 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 2361 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH); 2362 return -1; 2363 } 2364 ret=1; 2365 return(ret); 2366 } 2367 2368 2369int ssl3_send_client_key_exchange(SSL *s) 2370 { 2371 unsigned char *p,*d; 2372 int n; 2373 unsigned long alg_k; 2374#ifndef OPENSSL_NO_RSA 2375 unsigned char *q; 2376 EVP_PKEY *pkey=NULL; 2377#endif 2378#ifndef OPENSSL_NO_KRB5 2379 KSSL_ERR kssl_err; 2380#endif /* OPENSSL_NO_KRB5 */ 2381#ifndef OPENSSL_NO_ECDH 2382 EC_KEY *clnt_ecdh = NULL; 2383 const EC_POINT *srvr_ecpoint = NULL; 2384 EVP_PKEY *srvr_pub_pkey = NULL; 2385 unsigned char *encodedPoint = NULL; 2386 int encoded_pt_len = 0; 2387 BN_CTX * bn_ctx = NULL; 2388#endif 2389 2390 if (s->state == SSL3_ST_CW_KEY_EXCH_A) 2391 { 2392 d=(unsigned char *)s->init_buf->data; 2393 p= &(d[4]); 2394 2395 alg_k=s->s3->tmp.new_cipher->algorithm_mkey; 2396 2397 /* Fool emacs indentation */ 2398 if (0) {} 2399#ifndef OPENSSL_NO_RSA 2400 else if (alg_k & SSL_kRSA) 2401 { 2402 RSA *rsa; 2403 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 2404 2405 if (s->session->sess_cert == NULL) 2406 { 2407 /* We should always have a server certificate with SSL_kRSA. */ 2408 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 2409 goto err; 2410 } 2411 2412 if (s->session->sess_cert->peer_rsa_tmp != NULL) 2413 rsa=s->session->sess_cert->peer_rsa_tmp; 2414 else 2415 { 2416 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 2417 if ((pkey == NULL) || 2418 (pkey->type != EVP_PKEY_RSA) || 2419 (pkey->pkey.rsa == NULL)) 2420 { 2421 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 2422 goto err; 2423 } 2424 rsa=pkey->pkey.rsa; 2425 EVP_PKEY_free(pkey); 2426 } 2427 2428 tmp_buf[0]=s->client_version>>8; 2429 tmp_buf[1]=s->client_version&0xff; 2430 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) 2431 goto err; 2432 2433 s->session->master_key_length=sizeof tmp_buf; 2434 2435 q=p; 2436 /* Fix buf for TLS and beyond */ 2437 if (s->version > SSL3_VERSION) 2438 p+=2; 2439 n=RSA_public_encrypt(sizeof tmp_buf, 2440 tmp_buf,p,rsa,RSA_PKCS1_PADDING); 2441#ifdef PKCS1_CHECK 2442 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++; 2443 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70; 2444#endif 2445 if (n <= 0) 2446 { 2447 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT); 2448 goto err; 2449 } 2450 2451 /* Fix buf for TLS and beyond */ 2452 if (s->version > SSL3_VERSION) 2453 { 2454 s2n(n,q); 2455 n+=2; 2456 } 2457 2458 s->session->master_key_length= 2459 s->method->ssl3_enc->generate_master_secret(s, 2460 s->session->master_key, 2461 tmp_buf,sizeof tmp_buf); 2462 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf); 2463 } 2464#endif 2465#ifndef OPENSSL_NO_KRB5 2466 else if (alg_k & SSL_kKRB5) 2467 { 2468 krb5_error_code krb5rc; 2469 KSSL_CTX *kssl_ctx = s->kssl_ctx; 2470 /* krb5_data krb5_ap_req; */ 2471 krb5_data *enc_ticket; 2472 krb5_data authenticator, *authp = NULL; 2473 EVP_CIPHER_CTX ciph_ctx; 2474 const EVP_CIPHER *enc = NULL; 2475 unsigned char iv[EVP_MAX_IV_LENGTH]; 2476 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 2477 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH 2478 + EVP_MAX_IV_LENGTH]; 2479 int padl, outl = sizeof(epms); 2480 2481 EVP_CIPHER_CTX_init(&ciph_ctx); 2482 2483#ifdef KSSL_DEBUG 2484 fprintf(stderr,"ssl3_send_client_key_exchange(%lx & %lx)\n", 2485 alg_k, SSL_kKRB5); 2486#endif /* KSSL_DEBUG */ 2487 2488 authp = NULL; 2489#ifdef KRB5SENDAUTH 2490 if (KRB5SENDAUTH) authp = &authenticator; 2491#endif /* KRB5SENDAUTH */ 2492 2493 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, 2494 &kssl_err); 2495 enc = kssl_map_enc(kssl_ctx->enctype); 2496 if (enc == NULL) 2497 goto err; 2498#ifdef KSSL_DEBUG 2499 { 2500 fprintf(stderr,"kssl_cget_tkt rtn %d\n", krb5rc); 2501 if (krb5rc && kssl_err.text) 2502 fprintf(stderr,"kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 2503 } 2504#endif /* KSSL_DEBUG */ 2505 2506 if (krb5rc) 2507 { 2508 ssl3_send_alert(s,SSL3_AL_FATAL, 2509 SSL_AD_HANDSHAKE_FAILURE); 2510 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2511 kssl_err.reason); 2512 goto err; 2513 } 2514 2515 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ 2516 ** in place of RFC 2712 KerberosWrapper, as in: 2517 ** 2518 ** Send ticket (copy to *p, set n = length) 2519 ** n = krb5_ap_req.length; 2520 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 2521 ** if (krb5_ap_req.data) 2522 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 2523 ** 2524 ** Now using real RFC 2712 KerberosWrapper 2525 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) 2526 ** Note: 2712 "opaque" types are here replaced 2527 ** with a 2-byte length followed by the value. 2528 ** Example: 2529 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 2530 ** Where "xx xx" = length bytes. Shown here with 2531 ** optional authenticator omitted. 2532 */ 2533 2534 /* KerberosWrapper.Ticket */ 2535 s2n(enc_ticket->length,p); 2536 memcpy(p, enc_ticket->data, enc_ticket->length); 2537 p+= enc_ticket->length; 2538 n = enc_ticket->length + 2; 2539 2540 /* KerberosWrapper.Authenticator */ 2541 if (authp && authp->length) 2542 { 2543 s2n(authp->length,p); 2544 memcpy(p, authp->data, authp->length); 2545 p+= authp->length; 2546 n+= authp->length + 2; 2547 2548 free(authp->data); 2549 authp->data = NULL; 2550 authp->length = 0; 2551 } 2552 else 2553 { 2554 s2n(0,p);/* null authenticator length */ 2555 n+=2; 2556 } 2557 2558 tmp_buf[0]=s->client_version>>8; 2559 tmp_buf[1]=s->client_version&0xff; 2560 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) 2561 goto err; 2562 2563 /* 20010420 VRS. Tried it this way; failed. 2564 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 2565 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 2566 ** kssl_ctx->length); 2567 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 2568 */ 2569 2570 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 2571 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL, 2572 kssl_ctx->key,iv); 2573 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf, 2574 sizeof tmp_buf); 2575 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl); 2576 outl += padl; 2577 if (outl > (int)sizeof epms) 2578 { 2579 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 2580 goto err; 2581 } 2582 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 2583 2584 /* KerberosWrapper.EncryptedPreMasterSecret */ 2585 s2n(outl,p); 2586 memcpy(p, epms, outl); 2587 p+=outl; 2588 n+=outl + 2; 2589 2590 s->session->master_key_length= 2591 s->method->ssl3_enc->generate_master_secret(s, 2592 s->session->master_key, 2593 tmp_buf, sizeof tmp_buf); 2594 2595 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 2596 OPENSSL_cleanse(epms, outl); 2597 } 2598#endif 2599#ifndef OPENSSL_NO_DH 2600 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 2601 { 2602 DH *dh_srvr,*dh_clnt; 2603 2604 if (s->session->sess_cert == NULL) 2605 { 2606 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 2607 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE); 2608 goto err; 2609 } 2610 2611 if (s->session->sess_cert->peer_dh_tmp != NULL) 2612 dh_srvr=s->session->sess_cert->peer_dh_tmp; 2613 else 2614 { 2615 /* we get them from the cert */ 2616 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 2617 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 2618 goto err; 2619 } 2620 2621 /* generate a new random key */ 2622 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL) 2623 { 2624 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 2625 goto err; 2626 } 2627 if (!DH_generate_key(dh_clnt)) 2628 { 2629 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 2630 DH_free(dh_clnt); 2631 goto err; 2632 } 2633 2634 /* use the 'p' output buffer for the DH key, but 2635 * make sure to clear it out afterwards */ 2636 2637 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt); 2638 2639 if (n <= 0) 2640 { 2641 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 2642 DH_free(dh_clnt); 2643 goto err; 2644 } 2645 2646 /* generate master key from the result */ 2647 s->session->master_key_length= 2648 s->method->ssl3_enc->generate_master_secret(s, 2649 s->session->master_key,p,n); 2650 /* clean up */ 2651 memset(p,0,n); 2652 2653 /* send off the data */ 2654 n=BN_num_bytes(dh_clnt->pub_key); 2655 s2n(n,p); 2656 BN_bn2bin(dh_clnt->pub_key,p); 2657 n+=2; 2658 2659 DH_free(dh_clnt); 2660 2661 /* perhaps clean things up a bit EAY EAY EAY EAY*/ 2662 } 2663#endif 2664 2665#ifndef OPENSSL_NO_ECDH 2666 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) 2667 { 2668 const EC_GROUP *srvr_group = NULL; 2669 EC_KEY *tkey; 2670 int ecdh_clnt_cert = 0; 2671 int field_size = 0; 2672 2673 if (s->session->sess_cert == NULL) 2674 { 2675 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 2676 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE); 2677 goto err; 2678 } 2679 2680 /* Did we send out the client's 2681 * ECDH share for use in premaster 2682 * computation as part of client certificate? 2683 * If so, set ecdh_clnt_cert to 1. 2684 */ 2685 if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 2686 { 2687 /* XXX: For now, we do not support client 2688 * authentication using ECDH certificates. 2689 * To add such support, one needs to add 2690 * code that checks for appropriate 2691 * conditions and sets ecdh_clnt_cert to 1. 2692 * For example, the cert have an ECC 2693 * key on the same curve as the server's 2694 * and the key should be authorized for 2695 * key agreement. 2696 * 2697 * One also needs to add code in ssl3_connect 2698 * to skip sending the certificate verify 2699 * message. 2700 * 2701 * if ((s->cert->key->privatekey != NULL) && 2702 * (s->cert->key->privatekey->type == 2703 * EVP_PKEY_EC) && ...) 2704 * ecdh_clnt_cert = 1; 2705 */ 2706 } 2707 2708 if (s->session->sess_cert->peer_ecdh_tmp != NULL) 2709 { 2710 tkey = s->session->sess_cert->peer_ecdh_tmp; 2711 } 2712 else 2713 { 2714 /* Get the Server Public Key from Cert */ 2715 srvr_pub_pkey = X509_get_pubkey(s->session-> \ 2716 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 2717 if ((srvr_pub_pkey == NULL) || 2718 (srvr_pub_pkey->type != EVP_PKEY_EC) || 2719 (srvr_pub_pkey->pkey.ec == NULL)) 2720 { 2721 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2722 ERR_R_INTERNAL_ERROR); 2723 goto err; 2724 } 2725 2726 tkey = srvr_pub_pkey->pkey.ec; 2727 } 2728 2729 srvr_group = EC_KEY_get0_group(tkey); 2730 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 2731 2732 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) 2733 { 2734 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2735 ERR_R_INTERNAL_ERROR); 2736 goto err; 2737 } 2738 2739 if ((clnt_ecdh=EC_KEY_new()) == NULL) 2740 { 2741 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 2742 goto err; 2743 } 2744 2745 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) 2746 { 2747 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 2748 goto err; 2749 } 2750 if (ecdh_clnt_cert) 2751 { 2752 /* Reuse key info from our certificate 2753 * We only need our private key to perform 2754 * the ECDH computation. 2755 */ 2756 const BIGNUM *priv_key; 2757 tkey = s->cert->key->privatekey->pkey.ec; 2758 priv_key = EC_KEY_get0_private_key(tkey); 2759 if (priv_key == NULL) 2760 { 2761 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 2762 goto err; 2763 } 2764 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) 2765 { 2766 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 2767 goto err; 2768 } 2769 } 2770 else 2771 { 2772 /* Generate a new ECDH key pair */ 2773 if (!(EC_KEY_generate_key(clnt_ecdh))) 2774 { 2775 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 2776 goto err; 2777 } 2778 } 2779 2780 /* use the 'p' output buffer for the ECDH key, but 2781 * make sure to clear it out afterwards 2782 */ 2783 2784 field_size = EC_GROUP_get_degree(srvr_group); 2785 if (field_size <= 0) 2786 { 2787 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2788 ERR_R_ECDH_LIB); 2789 goto err; 2790 } 2791 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL); 2792 if (n <= 0) 2793 { 2794 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2795 ERR_R_ECDH_LIB); 2796 goto err; 2797 } 2798 2799 /* generate master key from the result */ 2800 s->session->master_key_length = s->method->ssl3_enc \ 2801 -> generate_master_secret(s, 2802 s->session->master_key, 2803 p, n); 2804 2805 memset(p, 0, n); /* clean up */ 2806 2807 if (ecdh_clnt_cert) 2808 { 2809 /* Send empty client key exch message */ 2810 n = 0; 2811 } 2812 else 2813 { 2814 /* First check the size of encoding and 2815 * allocate memory accordingly. 2816 */ 2817 encoded_pt_len = 2818 EC_POINT_point2oct(srvr_group, 2819 EC_KEY_get0_public_key(clnt_ecdh), 2820 POINT_CONVERSION_UNCOMPRESSED, 2821 NULL, 0, NULL); 2822 2823 encodedPoint = (unsigned char *) 2824 OPENSSL_malloc(encoded_pt_len * 2825 sizeof(unsigned char)); 2826 bn_ctx = BN_CTX_new(); 2827 if ((encodedPoint == NULL) || 2828 (bn_ctx == NULL)) 2829 { 2830 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 2831 goto err; 2832 } 2833 2834 /* Encode the public key */ 2835 n = EC_POINT_point2oct(srvr_group, 2836 EC_KEY_get0_public_key(clnt_ecdh), 2837 POINT_CONVERSION_UNCOMPRESSED, 2838 encodedPoint, encoded_pt_len, bn_ctx); 2839 2840 *p = n; /* length of encoded point */ 2841 /* Encoded point will be copied here */ 2842 p += 1; 2843 /* copy the point */ 2844 memcpy((unsigned char *)p, encodedPoint, n); 2845 /* increment n to account for length field */ 2846 n += 1; 2847 } 2848 2849 /* Free allocated memory */ 2850 BN_CTX_free(bn_ctx); 2851 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 2852 if (clnt_ecdh != NULL) 2853 EC_KEY_free(clnt_ecdh); 2854 EVP_PKEY_free(srvr_pub_pkey); 2855 } 2856#endif /* !OPENSSL_NO_ECDH */ 2857 else if (alg_k & SSL_kGOST) 2858 { 2859 /* GOST key exchange message creation */ 2860 EVP_PKEY_CTX *pkey_ctx; 2861 X509 *peer_cert; 2862 size_t msglen; 2863 unsigned int md_len; 2864 int keytype; 2865 unsigned char premaster_secret[32],shared_ukm[32], tmp[256]; 2866 EVP_MD_CTX *ukm_hash; 2867 EVP_PKEY *pub_key; 2868 2869 /* Get server sertificate PKEY and create ctx from it */ 2870 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509; 2871 if (!peer_cert) 2872 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509; 2873 if (!peer_cert) { 2874 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2875 goto err; 2876 } 2877 2878 pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL); 2879 /* If we have send a certificate, and certificate key 2880 2881 * parameters match those of server certificate, use 2882 * certificate key for key exchange 2883 */ 2884 2885 /* Otherwise, generate ephemeral key pair */ 2886 2887 EVP_PKEY_encrypt_init(pkey_ctx); 2888 /* Generate session key */ 2889 RAND_bytes(premaster_secret,32); 2890 /* If we have client certificate, use its secret as peer key */ 2891 if (s->s3->tmp.cert_req && s->cert->key->privatekey) { 2892 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) { 2893 /* If there was an error - just ignore it. Ephemeral key 2894 * would be used 2895 */ 2896 ERR_clear_error(); 2897 } 2898 } 2899 /* Compute shared IV and store it in algorithm-specific 2900 * context data */ 2901 ukm_hash = EVP_MD_CTX_create(); 2902 EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94)); 2903 EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE); 2904 EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE); 2905 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2906 EVP_MD_CTX_destroy(ukm_hash); 2907 if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV, 2908 8,shared_ukm)<0) { 2909 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2910 SSL_R_LIBRARY_BUG); 2911 goto err; 2912 } 2913 /* Make GOST keytransport blob message */ 2914 /*Encapsulate it into sequence */ 2915 *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED; 2916 msglen=255; 2917 if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) { 2918 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2919 SSL_R_LIBRARY_BUG); 2920 goto err; 2921 } 2922 if (msglen >= 0x80) 2923 { 2924 *(p++)=0x81; 2925 *(p++)= msglen & 0xff; 2926 n=msglen+3; 2927 } 2928 else 2929 { 2930 *(p++)= msglen & 0xff; 2931 n=msglen+2; 2932 } 2933 memcpy(p, tmp, msglen); 2934 /* Check if pubkey from client certificate was used */ 2935 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) 2936 { 2937 /* Set flag "skip certificate verify" */ 2938 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2939 } 2940 EVP_PKEY_CTX_free(pkey_ctx); 2941 s->session->master_key_length= 2942 s->method->ssl3_enc->generate_master_secret(s, 2943 s->session->master_key,premaster_secret,32); 2944 EVP_PKEY_free(pub_key); 2945 2946 } 2947#ifndef OPENSSL_NO_SRP 2948 else if (alg_k & SSL_kSRP) 2949 { 2950 if (s->srp_ctx.A != NULL) 2951 { 2952 /* send off the data */ 2953 n=BN_num_bytes(s->srp_ctx.A); 2954 s2n(n,p); 2955 BN_bn2bin(s->srp_ctx.A,p); 2956 n+=2; 2957 } 2958 else 2959 { 2960 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 2961 goto err; 2962 } 2963 if (s->session->srp_username != NULL) 2964 OPENSSL_free(s->session->srp_username); 2965 s->session->srp_username = BUF_strdup(s->srp_ctx.login); 2966 if (s->session->srp_username == NULL) 2967 { 2968 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2969 ERR_R_MALLOC_FAILURE); 2970 goto err; 2971 } 2972 2973 if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0) 2974 { 2975 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 2976 goto err; 2977 } 2978 } 2979#endif 2980#ifndef OPENSSL_NO_PSK 2981 else if (alg_k & SSL_kPSK) 2982 { 2983 /* The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes 2984 * to return a \0-terminated identity. The last byte 2985 * is for us for simulating strnlen. */ 2986 char identity[PSK_MAX_IDENTITY_LEN + 2]; 2987 size_t identity_len; 2988 unsigned char *t = NULL; 2989 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4]; 2990 unsigned int pre_ms_len = 0, psk_len = 0; 2991 int psk_err = 1; 2992 2993 n = 0; 2994 if (s->psk_client_callback == NULL) 2995 { 2996 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2997 SSL_R_PSK_NO_CLIENT_CB); 2998 goto err; 2999 } 3000 3001 memset(identity, 0, sizeof(identity)); 3002 psk_len = s->psk_client_callback(s, s->session->psk_identity_hint, 3003 identity, sizeof(identity) - 1, 3004 psk_or_pre_ms, sizeof(psk_or_pre_ms)); 3005 if (psk_len > PSK_MAX_PSK_LEN) 3006 { 3007 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3008 ERR_R_INTERNAL_ERROR); 3009 goto psk_err; 3010 } 3011 else if (psk_len == 0) 3012 { 3013 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3014 SSL_R_PSK_IDENTITY_NOT_FOUND); 3015 goto psk_err; 3016 } 3017 identity[PSK_MAX_IDENTITY_LEN + 1] = '\0'; 3018 identity_len = strlen(identity); 3019 if (identity_len > PSK_MAX_IDENTITY_LEN) 3020 { 3021 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3022 ERR_R_INTERNAL_ERROR); 3023 goto psk_err; 3024 } 3025 /* create PSK pre_master_secret */ 3026 pre_ms_len = 2+psk_len+2+psk_len; 3027 t = psk_or_pre_ms; 3028 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len); 3029 s2n(psk_len, t); 3030 memset(t, 0, psk_len); 3031 t+=psk_len; 3032 s2n(psk_len, t); 3033 3034 if (s->session->psk_identity_hint != NULL) 3035 OPENSSL_free(s->session->psk_identity_hint); 3036 s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint); 3037 if (s->ctx->psk_identity_hint != NULL && 3038 s->session->psk_identity_hint == NULL) 3039 { 3040 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3041 ERR_R_MALLOC_FAILURE); 3042 goto psk_err; 3043 } 3044 3045 if (s->session->psk_identity != NULL) 3046 OPENSSL_free(s->session->psk_identity); 3047 s->session->psk_identity = BUF_strdup(identity); 3048 if (s->session->psk_identity == NULL) 3049 { 3050 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3051 ERR_R_MALLOC_FAILURE); 3052 goto psk_err; 3053 } 3054 3055 s->session->master_key_length = 3056 s->method->ssl3_enc->generate_master_secret(s, 3057 s->session->master_key, 3058 psk_or_pre_ms, pre_ms_len); 3059 s2n(identity_len, p); 3060 memcpy(p, identity, identity_len); 3061 n = 2 + identity_len; 3062 psk_err = 0; 3063 psk_err: 3064 OPENSSL_cleanse(identity, sizeof(identity)); 3065 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 3066 if (psk_err != 0) 3067 { 3068 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 3069 goto err; 3070 } 3071 } 3072#endif 3073 else 3074 { 3075 ssl3_send_alert(s, SSL3_AL_FATAL, 3076 SSL_AD_HANDSHAKE_FAILURE); 3077 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3078 ERR_R_INTERNAL_ERROR); 3079 goto err; 3080 } 3081 3082 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 3083 l2n3(n,d); 3084 3085 s->state=SSL3_ST_CW_KEY_EXCH_B; 3086 /* number of bytes to write */ 3087 s->init_num=n+4; 3088 s->init_off=0; 3089 } 3090 3091 /* SSL3_ST_CW_KEY_EXCH_B */ 3092 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); 3093err: 3094#ifndef OPENSSL_NO_ECDH 3095 BN_CTX_free(bn_ctx); 3096 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 3097 if (clnt_ecdh != NULL) 3098 EC_KEY_free(clnt_ecdh); 3099 EVP_PKEY_free(srvr_pub_pkey); 3100#endif 3101 return(-1); 3102 } 3103 3104int ssl3_send_client_verify(SSL *s) 3105 { 3106 unsigned char *p,*d; 3107 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 3108 EVP_PKEY *pkey; 3109 EVP_PKEY_CTX *pctx=NULL; 3110 EVP_MD_CTX mctx; 3111 unsigned u=0; 3112 unsigned long n; 3113 int j; 3114 3115 EVP_MD_CTX_init(&mctx); 3116 3117 if (s->state == SSL3_ST_CW_CERT_VRFY_A) 3118 { 3119 d=(unsigned char *)s->init_buf->data; 3120 p= &(d[4]); 3121 pkey=s->cert->key->privatekey; 3122/* Create context from key and test if sha1 is allowed as digest */ 3123 pctx = EVP_PKEY_CTX_new(pkey,NULL); 3124 EVP_PKEY_sign_init(pctx); 3125 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0) 3126 { 3127 if (TLS1_get_version(s) < TLS1_2_VERSION) 3128 s->method->ssl3_enc->cert_verify_mac(s, 3129 NID_sha1, 3130 &(data[MD5_DIGEST_LENGTH])); 3131 } 3132 else 3133 { 3134 ERR_clear_error(); 3135 } 3136 /* For TLS v1.2 send signature algorithm and signature 3137 * using agreed digest and cached handshake records. 3138 */ 3139 if (TLS1_get_version(s) >= TLS1_2_VERSION) 3140 { 3141 long hdatalen = 0; 3142 void *hdata; 3143 const EVP_MD *md = s->cert->key->digest; 3144 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, 3145 &hdata); 3146 if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md)) 3147 { 3148 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, 3149 ERR_R_INTERNAL_ERROR); 3150 goto err; 3151 } 3152 p += 2; 3153#ifdef SSL_DEBUG 3154 fprintf(stderr, "Using TLS 1.2 with client alg %s\n", 3155 EVP_MD_name(md)); 3156#endif 3157 if (!EVP_SignInit_ex(&mctx, md, NULL) 3158 || !EVP_SignUpdate(&mctx, hdata, hdatalen) 3159 || !EVP_SignFinal(&mctx, p + 2, &u, pkey)) 3160 { 3161 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, 3162 ERR_R_EVP_LIB); 3163 goto err; 3164 } 3165 s2n(u,p); 3166 n = u + 4; 3167 if (!ssl3_digest_cached_records(s)) 3168 goto err; 3169 } 3170 else 3171#ifndef OPENSSL_NO_RSA 3172 if (pkey->type == EVP_PKEY_RSA) 3173 { 3174 s->method->ssl3_enc->cert_verify_mac(s, 3175 NID_md5, 3176 &(data[0])); 3177 if (RSA_sign(NID_md5_sha1, data, 3178 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, 3179 &(p[2]), &u, pkey->pkey.rsa) <= 0 ) 3180 { 3181 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB); 3182 goto err; 3183 } 3184 s2n(u,p); 3185 n=u+2; 3186 } 3187 else 3188#endif 3189#ifndef OPENSSL_NO_DSA 3190 if (pkey->type == EVP_PKEY_DSA) 3191 { 3192 if (!DSA_sign(pkey->save_type, 3193 &(data[MD5_DIGEST_LENGTH]), 3194 SHA_DIGEST_LENGTH,&(p[2]), 3195 (unsigned int *)&j,pkey->pkey.dsa)) 3196 { 3197 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB); 3198 goto err; 3199 } 3200 s2n(j,p); 3201 n=j+2; 3202 } 3203 else 3204#endif 3205#ifndef OPENSSL_NO_ECDSA 3206 if (pkey->type == EVP_PKEY_EC) 3207 { 3208 if (!ECDSA_sign(pkey->save_type, 3209 &(data[MD5_DIGEST_LENGTH]), 3210 SHA_DIGEST_LENGTH,&(p[2]), 3211 (unsigned int *)&j,pkey->pkey.ec)) 3212 { 3213 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, 3214 ERR_R_ECDSA_LIB); 3215 goto err; 3216 } 3217 s2n(j,p); 3218 n=j+2; 3219 } 3220 else 3221#endif 3222 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001) 3223 { 3224 unsigned char signbuf[64]; 3225 int i; 3226 size_t sigsize=64; 3227 s->method->ssl3_enc->cert_verify_mac(s, 3228 NID_id_GostR3411_94, 3229 data); 3230 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) { 3231 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, 3232 ERR_R_INTERNAL_ERROR); 3233 goto err; 3234 } 3235 for (i=63,j=0; i>=0; j++, i--) { 3236 p[2+j]=signbuf[i]; 3237 } 3238 s2n(j,p); 3239 n=j+2; 3240 } 3241 else 3242 { 3243 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR); 3244 goto err; 3245 } 3246 *(d++)=SSL3_MT_CERTIFICATE_VERIFY; 3247 l2n3(n,d); 3248 3249 s->state=SSL3_ST_CW_CERT_VRFY_B; 3250 s->init_num=(int)n+4; 3251 s->init_off=0; 3252 } 3253 EVP_MD_CTX_cleanup(&mctx); 3254 EVP_PKEY_CTX_free(pctx); 3255 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); 3256err: 3257 EVP_MD_CTX_cleanup(&mctx); 3258 EVP_PKEY_CTX_free(pctx); 3259 return(-1); 3260 } 3261 3262int ssl3_send_client_certificate(SSL *s) 3263 { 3264 X509 *x509=NULL; 3265 EVP_PKEY *pkey=NULL; 3266 int i; 3267 unsigned long l; 3268 3269 if (s->state == SSL3_ST_CW_CERT_A) 3270 { 3271 if ((s->cert == NULL) || 3272 (s->cert->key->x509 == NULL) || 3273 (s->cert->key->privatekey == NULL)) 3274 s->state=SSL3_ST_CW_CERT_B; 3275 else 3276 s->state=SSL3_ST_CW_CERT_C; 3277 } 3278 3279 /* We need to get a client cert */ 3280 if (s->state == SSL3_ST_CW_CERT_B) 3281 { 3282 /* If we get an error, we need to 3283 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 3284 * We then get retied later */ 3285 i=0; 3286 i = ssl_do_client_cert_cb(s, &x509, &pkey); 3287 if (i < 0) 3288 { 3289 s->rwstate=SSL_X509_LOOKUP; 3290 return(-1); 3291 } 3292 s->rwstate=SSL_NOTHING; 3293 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) 3294 { 3295 s->state=SSL3_ST_CW_CERT_B; 3296 if ( !SSL_use_certificate(s,x509) || 3297 !SSL_use_PrivateKey(s,pkey)) 3298 i=0; 3299 } 3300 else if (i == 1) 3301 { 3302 i=0; 3303 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 3304 } 3305 3306 if (x509 != NULL) X509_free(x509); 3307 if (pkey != NULL) EVP_PKEY_free(pkey); 3308 if (i == 0) 3309 { 3310 if (s->version == SSL3_VERSION) 3311 { 3312 s->s3->tmp.cert_req=0; 3313 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE); 3314 return(1); 3315 } 3316 else 3317 { 3318 s->s3->tmp.cert_req=2; 3319 } 3320 } 3321 3322 /* Ok, we have a cert */ 3323 s->state=SSL3_ST_CW_CERT_C; 3324 } 3325 3326 if (s->state == SSL3_ST_CW_CERT_C) 3327 { 3328 s->state=SSL3_ST_CW_CERT_D; 3329 l=ssl3_output_cert_chain(s, 3330 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509); 3331 if (!l) 3332 { 3333 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); 3334 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR); 3335 return 0; 3336 } 3337 s->init_num=(int)l; 3338 s->init_off=0; 3339 } 3340 /* SSL3_ST_CW_CERT_D */ 3341 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); 3342 } 3343 3344#define has_bits(i,m) (((i)&(m)) == (m)) 3345 3346int ssl3_check_cert_and_algorithm(SSL *s) 3347 { 3348 int i,idx; 3349 long alg_k,alg_a; 3350 EVP_PKEY *pkey=NULL; 3351 int pkey_bits; 3352 SESS_CERT *sc; 3353#ifndef OPENSSL_NO_RSA 3354 RSA *rsa; 3355#endif 3356#ifndef OPENSSL_NO_DH 3357 DH *dh; 3358#endif 3359 int al = SSL_AD_HANDSHAKE_FAILURE; 3360 3361 alg_k=s->s3->tmp.new_cipher->algorithm_mkey; 3362 alg_a=s->s3->tmp.new_cipher->algorithm_auth; 3363 3364 /* we don't have a certificate */ 3365 if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK)) 3366 return(1); 3367 3368 sc=s->session->sess_cert; 3369 if (sc == NULL) 3370 { 3371 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR); 3372 goto err; 3373 } 3374 3375#ifndef OPENSSL_NO_RSA 3376 rsa=s->session->sess_cert->peer_rsa_tmp; 3377#endif 3378#ifndef OPENSSL_NO_DH 3379 dh=s->session->sess_cert->peer_dh_tmp; 3380#endif 3381 3382 /* This is the passed certificate */ 3383 3384 idx=sc->peer_cert_type; 3385#ifndef OPENSSL_NO_ECDH 3386 if (idx == SSL_PKEY_ECC) 3387 { 3388 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509, 3389 s) == 0) 3390 { /* check failed */ 3391 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT); 3392 goto f_err; 3393 } 3394 else 3395 { 3396 return 1; 3397 } 3398 } 3399#endif 3400 pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509); 3401 pkey_bits = EVP_PKEY_bits(pkey); 3402 i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey); 3403 EVP_PKEY_free(pkey); 3404 3405 3406 /* Check that we have a certificate if we require one */ 3407 if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN)) 3408 { 3409 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT); 3410 goto f_err; 3411 } 3412#ifndef OPENSSL_NO_DSA 3413 else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN)) 3414 { 3415 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT); 3416 goto f_err; 3417 } 3418#endif 3419#ifndef OPENSSL_NO_RSA 3420 if (alg_k & SSL_kRSA) { 3421 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 3422 !has_bits(i, EVP_PK_RSA | EVP_PKT_ENC)) { 3423 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3424 SSL_R_MISSING_RSA_ENCRYPTING_CERT); 3425 goto f_err; 3426 } else if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) { 3427 if (pkey_bits <= SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) { 3428 if (!has_bits(i, EVP_PK_RSA | EVP_PKT_ENC)) { 3429 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3430 SSL_R_MISSING_RSA_ENCRYPTING_CERT); 3431 goto f_err; 3432 } 3433 if (rsa != NULL) { 3434 /* server key exchange is not allowed. */ 3435 al = SSL_AD_INTERNAL_ERROR; 3436 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR); 3437 goto f_err; 3438 } 3439 } 3440 } 3441 } 3442#endif 3443#ifndef OPENSSL_NO_DH 3444 if ((alg_k & SSL_kEDH) && dh == NULL) { 3445 al = SSL_AD_INTERNAL_ERROR; 3446 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR); 3447 goto f_err; 3448 } 3449 if ((alg_k & SSL_kDHr) && !has_bits(i, EVP_PK_DH | EVP_PKS_RSA)) { 3450 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3451 SSL_R_MISSING_DH_RSA_CERT); 3452 goto f_err; 3453 } 3454# ifndef OPENSSL_NO_DSA 3455 if ((alg_k & SSL_kDHd) && !has_bits(i, EVP_PK_DH | EVP_PKS_DSA)) { 3456 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3457 SSL_R_MISSING_DH_DSA_CERT); 3458 goto f_err; 3459 } 3460# endif 3461 3462 /* Check DHE only: static DH not implemented. */ 3463 if (alg_k & SSL_kEDH) { 3464 int dh_size = BN_num_bits(dh->p); 3465 if ((!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && dh_size < 768) 3466 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && dh_size < 512)) { 3467 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_DH_KEY_TOO_SMALL); 3468 goto f_err; 3469 } 3470 } 3471#endif /* !OPENSSL_NO_DH */ 3472 3473 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 3474 pkey_bits > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) 3475 { 3476#ifndef OPENSSL_NO_RSA 3477 if (alg_k & SSL_kRSA) { 3478 if (rsa == NULL) { 3479 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3480 SSL_R_MISSING_EXPORT_TMP_RSA_KEY); 3481 goto f_err; 3482 } else if (BN_num_bits(rsa->n) > 3483 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) { 3484 /* We have a temporary RSA key but it's too large. */ 3485 al = SSL_AD_EXPORT_RESTRICTION; 3486 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3487 SSL_R_MISSING_EXPORT_TMP_RSA_KEY); 3488 goto f_err; 3489 } 3490 } else 3491#endif 3492#ifndef OPENSSL_NO_DH 3493 if (alg_k & SSL_kEDH) { 3494 if (BN_num_bits(dh->p) > 3495 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) { 3496 /* We have a temporary DH key but it's too large. */ 3497 al = SSL_AD_EXPORT_RESTRICTION; 3498 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3499 SSL_R_MISSING_EXPORT_TMP_DH_KEY); 3500 goto f_err; 3501 } 3502 } else if (alg_k & (SSL_kDHr | SSL_kDHd)) { 3503 /* The cert should have had an export DH key. */ 3504 al = SSL_AD_EXPORT_RESTRICTION; 3505 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3506 SSL_R_MISSING_EXPORT_TMP_DH_KEY); 3507 goto f_err; 3508 } else 3509#endif 3510 { 3511 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3512 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 3513 goto f_err; 3514 } 3515 } 3516 return (1); 3517 f_err: 3518 ssl3_send_alert(s, SSL3_AL_FATAL, al); 3519 err: 3520 return (0); 3521} 3522 3523#if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG) 3524int ssl3_send_next_proto(SSL *s) 3525 { 3526 unsigned int len, padding_len; 3527 unsigned char *d; 3528 3529 if (s->state == SSL3_ST_CW_NEXT_PROTO_A) 3530 { 3531 len = s->next_proto_negotiated_len; 3532 padding_len = 32 - ((len + 2) % 32); 3533 d = (unsigned char *)s->init_buf->data; 3534 d[4] = len; 3535 memcpy(d + 5, s->next_proto_negotiated, len); 3536 d[5 + len] = padding_len; 3537 memset(d + 6 + len, 0, padding_len); 3538 *(d++)=SSL3_MT_NEXT_PROTO; 3539 l2n3(2 + len + padding_len, d); 3540 s->state = SSL3_ST_CW_NEXT_PROTO_B; 3541 s->init_num = 4 + 2 + len + padding_len; 3542 s->init_off = 0; 3543 } 3544 3545 return ssl3_do_write(s, SSL3_RT_HANDSHAKE); 3546 } 3547#endif /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */ 3548 3549int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 3550 { 3551 int i = 0; 3552#ifndef OPENSSL_NO_ENGINE 3553 if (s->ctx->client_cert_engine) 3554 { 3555 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s, 3556 SSL_get_client_CA_list(s), 3557 px509, ppkey, NULL, NULL, NULL); 3558 if (i != 0) 3559 return i; 3560 } 3561#endif 3562 if (s->ctx->client_cert_cb) 3563 i = s->ctx->client_cert_cb(s,px509,ppkey); 3564 return i; 3565 } 3566