s3_clnt.c revision 279264
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 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1]; 1364 1365 param_len = 2; 1366 if (param_len > n) 1367 { 1368 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1369 SSL_R_LENGTH_TOO_SHORT); 1370 goto f_err; 1371 } 1372 n2s(p,i); 1373 1374 /* Store PSK identity hint for later use, hint is used 1375 * in ssl3_send_client_key_exchange. Assume that the 1376 * maximum length of a PSK identity hint can be as 1377 * long as the maximum length of a PSK identity. */ 1378 if (i > PSK_MAX_IDENTITY_LEN) 1379 { 1380 al=SSL_AD_HANDSHAKE_FAILURE; 1381 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1382 SSL_R_DATA_LENGTH_TOO_LONG); 1383 goto f_err; 1384 } 1385 if (i > n - param_len) 1386 { 1387 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1388 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH); 1389 goto f_err; 1390 } 1391 param_len += i; 1392 1393 /* If received PSK identity hint contains NULL 1394 * characters, the hint is truncated from the first 1395 * NULL. p may not be ending with NULL, so create a 1396 * NULL-terminated string. */ 1397 memcpy(tmp_id_hint, p, i); 1398 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i); 1399 if (s->ctx->psk_identity_hint != NULL) 1400 OPENSSL_free(s->ctx->psk_identity_hint); 1401 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint); 1402 if (s->ctx->psk_identity_hint == NULL) 1403 { 1404 al=SSL_AD_HANDSHAKE_FAILURE; 1405 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); 1406 goto f_err; 1407 } 1408 1409 p+=i; 1410 n-=param_len; 1411 } 1412 else 1413#endif /* !OPENSSL_NO_PSK */ 1414#ifndef OPENSSL_NO_SRP 1415 if (alg_k & SSL_kSRP) 1416 { 1417 param_len = 2; 1418 if (param_len > n) 1419 { 1420 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1421 SSL_R_LENGTH_TOO_SHORT); 1422 goto f_err; 1423 } 1424 n2s(p,i); 1425 1426 if (i > n - param_len) 1427 { 1428 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH); 1429 goto f_err; 1430 } 1431 param_len += i; 1432 1433 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL))) 1434 { 1435 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1436 goto err; 1437 } 1438 p+=i; 1439 1440 1441 if (2 > n - param_len) 1442 { 1443 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1444 SSL_R_LENGTH_TOO_SHORT); 1445 goto f_err; 1446 } 1447 param_len += 2; 1448 1449 n2s(p,i); 1450 1451 if (i > n - param_len) 1452 { 1453 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH); 1454 goto f_err; 1455 } 1456 param_len += i; 1457 1458 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL))) 1459 { 1460 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1461 goto err; 1462 } 1463 p+=i; 1464 1465 1466 if (1 > n - param_len) 1467 { 1468 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1469 SSL_R_LENGTH_TOO_SHORT); 1470 goto f_err; 1471 } 1472 param_len += 1; 1473 1474 i = (unsigned int)(p[0]); 1475 p++; 1476 1477 if (i > n - param_len) 1478 { 1479 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH); 1480 goto f_err; 1481 } 1482 param_len += i; 1483 1484 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL))) 1485 { 1486 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1487 goto err; 1488 } 1489 p+=i; 1490 1491 if (2 > n - param_len) 1492 { 1493 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1494 SSL_R_LENGTH_TOO_SHORT); 1495 goto f_err; 1496 } 1497 param_len += 2; 1498 1499 n2s(p,i); 1500 1501 if (i > n - param_len) 1502 { 1503 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH); 1504 goto f_err; 1505 } 1506 param_len += i; 1507 1508 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL))) 1509 { 1510 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1511 goto err; 1512 } 1513 p+=i; 1514 n-=param_len; 1515 1516 if (!srp_verify_server_param(s, &al)) 1517 { 1518 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS); 1519 goto f_err; 1520 } 1521 1522/* We must check if there is a certificate */ 1523#ifndef OPENSSL_NO_RSA 1524 if (alg_a & SSL_aRSA) 1525 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1526#else 1527 if (0) 1528 ; 1529#endif 1530#ifndef OPENSSL_NO_DSA 1531 else if (alg_a & SSL_aDSS) 1532 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509); 1533#endif 1534 } 1535 else 1536#endif /* !OPENSSL_NO_SRP */ 1537#ifndef OPENSSL_NO_RSA 1538 if (alg_k & SSL_kRSA) 1539 { 1540 /* Temporary RSA keys only allowed in export ciphersuites */ 1541 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) 1542 { 1543 al=SSL_AD_UNEXPECTED_MESSAGE; 1544 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE); 1545 goto f_err; 1546 } 1547 if ((rsa=RSA_new()) == NULL) 1548 { 1549 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1550 goto err; 1551 } 1552 1553 param_len = 2; 1554 if (param_len > n) 1555 { 1556 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1557 SSL_R_LENGTH_TOO_SHORT); 1558 goto f_err; 1559 } 1560 n2s(p,i); 1561 1562 if (i > n - param_len) 1563 { 1564 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH); 1565 goto f_err; 1566 } 1567 param_len += i; 1568 1569 if (!(rsa->n=BN_bin2bn(p,i,rsa->n))) 1570 { 1571 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1572 goto err; 1573 } 1574 p+=i; 1575 1576 if (2 > n - param_len) 1577 { 1578 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1579 SSL_R_LENGTH_TOO_SHORT); 1580 goto f_err; 1581 } 1582 param_len += 2; 1583 1584 n2s(p,i); 1585 1586 if (i > n - param_len) 1587 { 1588 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH); 1589 goto f_err; 1590 } 1591 param_len += i; 1592 1593 if (!(rsa->e=BN_bin2bn(p,i,rsa->e))) 1594 { 1595 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1596 goto err; 1597 } 1598 p+=i; 1599 n-=param_len; 1600 1601 /* this should be because we are using an export cipher */ 1602 if (alg_a & SSL_aRSA) 1603 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1604 else 1605 { 1606 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1607 goto err; 1608 } 1609 s->session->sess_cert->peer_rsa_tmp=rsa; 1610 rsa=NULL; 1611 } 1612#else /* OPENSSL_NO_RSA */ 1613 if (0) 1614 ; 1615#endif 1616#ifndef OPENSSL_NO_DH 1617 else if (alg_k & SSL_kEDH) 1618 { 1619 if ((dh=DH_new()) == NULL) 1620 { 1621 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB); 1622 goto err; 1623 } 1624 1625 param_len = 2; 1626 if (param_len > n) 1627 { 1628 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1629 SSL_R_LENGTH_TOO_SHORT); 1630 goto f_err; 1631 } 1632 n2s(p,i); 1633 1634 if (i > n - param_len) 1635 { 1636 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH); 1637 goto f_err; 1638 } 1639 param_len += i; 1640 1641 if (!(dh->p=BN_bin2bn(p,i,NULL))) 1642 { 1643 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1644 goto err; 1645 } 1646 p+=i; 1647 1648 if (2 > n - param_len) 1649 { 1650 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1651 SSL_R_LENGTH_TOO_SHORT); 1652 goto f_err; 1653 } 1654 param_len += 2; 1655 1656 n2s(p,i); 1657 1658 if (i > n - param_len) 1659 { 1660 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH); 1661 goto f_err; 1662 } 1663 param_len += i; 1664 1665 if (!(dh->g=BN_bin2bn(p,i,NULL))) 1666 { 1667 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1668 goto err; 1669 } 1670 p+=i; 1671 1672 if (2 > n - param_len) 1673 { 1674 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1675 SSL_R_LENGTH_TOO_SHORT); 1676 goto f_err; 1677 } 1678 param_len += 2; 1679 1680 n2s(p,i); 1681 1682 if (i > n - param_len) 1683 { 1684 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH); 1685 goto f_err; 1686 } 1687 param_len += i; 1688 1689 if (!(dh->pub_key=BN_bin2bn(p,i,NULL))) 1690 { 1691 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB); 1692 goto err; 1693 } 1694 p+=i; 1695 n-=param_len; 1696 1697#ifndef OPENSSL_NO_RSA 1698 if (alg_a & SSL_aRSA) 1699 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1700#else 1701 if (0) 1702 ; 1703#endif 1704#ifndef OPENSSL_NO_DSA 1705 else if (alg_a & SSL_aDSS) 1706 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509); 1707#endif 1708 /* else anonymous DH, so no certificate or pkey. */ 1709 1710 s->session->sess_cert->peer_dh_tmp=dh; 1711 dh=NULL; 1712 } 1713 else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd)) 1714 { 1715 al=SSL_AD_ILLEGAL_PARAMETER; 1716 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER); 1717 goto f_err; 1718 } 1719#endif /* !OPENSSL_NO_DH */ 1720 1721#ifndef OPENSSL_NO_ECDH 1722 else if (alg_k & SSL_kEECDH) 1723 { 1724 EC_GROUP *ngroup; 1725 const EC_GROUP *group; 1726 1727 if ((ecdh=EC_KEY_new()) == NULL) 1728 { 1729 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1730 goto err; 1731 } 1732 1733 /* Extract elliptic curve parameters and the 1734 * server's ephemeral ECDH public key. 1735 * Keep accumulating lengths of various components in 1736 * param_len and make sure it never exceeds n. 1737 */ 1738 1739 /* XXX: For now we only support named (not generic) curves 1740 * and the ECParameters in this case is just three bytes. We 1741 * also need one byte for the length of the encoded point 1742 */ 1743 param_len=4; 1744 if (param_len > n) 1745 { 1746 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1747 SSL_R_LENGTH_TOO_SHORT); 1748 goto f_err; 1749 } 1750 1751 if ((*p != NAMED_CURVE_TYPE) || 1752 ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)) 1753 { 1754 al=SSL_AD_INTERNAL_ERROR; 1755 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1756 goto f_err; 1757 } 1758 1759 ngroup = EC_GROUP_new_by_curve_name(curve_nid); 1760 if (ngroup == NULL) 1761 { 1762 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB); 1763 goto err; 1764 } 1765 if (EC_KEY_set_group(ecdh, ngroup) == 0) 1766 { 1767 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB); 1768 goto err; 1769 } 1770 EC_GROUP_free(ngroup); 1771 1772 group = EC_KEY_get0_group(ecdh); 1773 1774 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 1775 (EC_GROUP_get_degree(group) > 163)) 1776 { 1777 al=SSL_AD_EXPORT_RESTRICTION; 1778 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER); 1779 goto f_err; 1780 } 1781 1782 p+=3; 1783 1784 /* Next, get the encoded ECPoint */ 1785 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) || 1786 ((bn_ctx = BN_CTX_new()) == NULL)) 1787 { 1788 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1789 goto err; 1790 } 1791 1792 encoded_pt_len = *p; /* length of encoded point */ 1793 p+=1; 1794 1795 if ((encoded_pt_len > n - param_len) || 1796 (EC_POINT_oct2point(group, srvr_ecpoint, 1797 p, encoded_pt_len, bn_ctx) == 0)) 1798 { 1799 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT); 1800 goto f_err; 1801 } 1802 param_len += encoded_pt_len; 1803 1804 n-=param_len; 1805 p+=encoded_pt_len; 1806 1807 /* The ECC/TLS specification does not mention 1808 * the use of DSA to sign ECParameters in the server 1809 * key exchange message. We do support RSA and ECDSA. 1810 */ 1811 if (0) ; 1812#ifndef OPENSSL_NO_RSA 1813 else if (alg_a & SSL_aRSA) 1814 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1815#endif 1816#ifndef OPENSSL_NO_ECDSA 1817 else if (alg_a & SSL_aECDSA) 1818 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1819#endif 1820 /* else anonymous ECDH, so no certificate or pkey. */ 1821 EC_KEY_set_public_key(ecdh, srvr_ecpoint); 1822 s->session->sess_cert->peer_ecdh_tmp=ecdh; 1823 ecdh=NULL; 1824 BN_CTX_free(bn_ctx); 1825 bn_ctx = NULL; 1826 EC_POINT_free(srvr_ecpoint); 1827 srvr_ecpoint = NULL; 1828 } 1829 else if (alg_k) 1830 { 1831 al=SSL_AD_UNEXPECTED_MESSAGE; 1832 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE); 1833 goto f_err; 1834 } 1835#endif /* !OPENSSL_NO_ECDH */ 1836 1837 1838 /* p points to the next byte, there are 'n' bytes left */ 1839 1840 /* if it was signed, check the signature */ 1841 if (pkey != NULL) 1842 { 1843 if (TLS1_get_version(s) >= TLS1_2_VERSION) 1844 { 1845 int sigalg; 1846 if (2 > n) 1847 { 1848 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1849 SSL_R_LENGTH_TOO_SHORT); 1850 goto f_err; 1851 } 1852 1853 sigalg = tls12_get_sigid(pkey); 1854 /* Should never happen */ 1855 if (sigalg == -1) 1856 { 1857 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1858 goto err; 1859 } 1860 /* Check key type is consistent with signature */ 1861 if (sigalg != (int)p[1]) 1862 { 1863 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_TYPE); 1864 al=SSL_AD_DECODE_ERROR; 1865 goto f_err; 1866 } 1867 md = tls12_get_hash(p[0]); 1868 if (md == NULL) 1869 { 1870 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNKNOWN_DIGEST); 1871 goto f_err; 1872 } 1873#ifdef SSL_DEBUG 1874fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md)); 1875#endif 1876 p += 2; 1877 n -= 2; 1878 } 1879 else 1880 md = EVP_sha1(); 1881 1882 if (2 > n) 1883 { 1884 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1885 SSL_R_LENGTH_TOO_SHORT); 1886 goto f_err; 1887 } 1888 n2s(p,i); 1889 n-=2; 1890 j=EVP_PKEY_size(pkey); 1891 1892 /* Check signature length. If n is 0 then signature is empty */ 1893 if ((i != n) || (n > j) || (n <= 0)) 1894 { 1895 /* wrong packet length */ 1896 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH); 1897 goto f_err; 1898 } 1899 1900#ifndef OPENSSL_NO_RSA 1901 if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION) 1902 { 1903 int num; 1904 unsigned int size; 1905 1906 j=0; 1907 q=md_buf; 1908 for (num=2; num > 0; num--) 1909 { 1910 EVP_MD_CTX_set_flags(&md_ctx, 1911 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 1912 EVP_DigestInit_ex(&md_ctx,(num == 2) 1913 ?s->ctx->md5:s->ctx->sha1, NULL); 1914 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1915 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1916 EVP_DigestUpdate(&md_ctx,param,param_len); 1917 EVP_DigestFinal_ex(&md_ctx,q,&size); 1918 q+=size; 1919 j+=size; 1920 } 1921 i=RSA_verify(NID_md5_sha1, md_buf, j, p, n, 1922 pkey->pkey.rsa); 1923 if (i < 0) 1924 { 1925 al=SSL_AD_DECRYPT_ERROR; 1926 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); 1927 goto f_err; 1928 } 1929 if (i == 0) 1930 { 1931 /* bad signature */ 1932 al=SSL_AD_DECRYPT_ERROR; 1933 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE); 1934 goto f_err; 1935 } 1936 } 1937 else 1938#endif 1939 { 1940 EVP_VerifyInit_ex(&md_ctx, md, NULL); 1941 EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1942 EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1943 EVP_VerifyUpdate(&md_ctx,param,param_len); 1944 if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0) 1945 { 1946 /* bad signature */ 1947 al=SSL_AD_DECRYPT_ERROR; 1948 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE); 1949 goto f_err; 1950 } 1951 } 1952 } 1953 else 1954 { 1955 /* aNULL, aSRP or kPSK do not need public keys */ 1956 if (!(alg_a & (SSL_aNULL|SSL_aSRP)) && !(alg_k & SSL_kPSK)) 1957 { 1958 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1959 goto err; 1960 } 1961 /* still data left over */ 1962 if (n != 0) 1963 { 1964 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE); 1965 goto f_err; 1966 } 1967 } 1968 EVP_PKEY_free(pkey); 1969 EVP_MD_CTX_cleanup(&md_ctx); 1970 return(1); 1971f_err: 1972 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1973err: 1974 EVP_PKEY_free(pkey); 1975#ifndef OPENSSL_NO_RSA 1976 if (rsa != NULL) 1977 RSA_free(rsa); 1978#endif 1979#ifndef OPENSSL_NO_DH 1980 if (dh != NULL) 1981 DH_free(dh); 1982#endif 1983#ifndef OPENSSL_NO_ECDH 1984 BN_CTX_free(bn_ctx); 1985 EC_POINT_free(srvr_ecpoint); 1986 if (ecdh != NULL) 1987 EC_KEY_free(ecdh); 1988#endif 1989 EVP_MD_CTX_cleanup(&md_ctx); 1990 return(-1); 1991 } 1992 1993int ssl3_get_certificate_request(SSL *s) 1994 { 1995 int ok,ret=0; 1996 unsigned long n,nc,l; 1997 unsigned int llen, ctype_num,i; 1998 X509_NAME *xn=NULL; 1999 const unsigned char *p,*q; 2000 unsigned char *d; 2001 STACK_OF(X509_NAME) *ca_sk=NULL; 2002 2003 n=s->method->ssl_get_message(s, 2004 SSL3_ST_CR_CERT_REQ_A, 2005 SSL3_ST_CR_CERT_REQ_B, 2006 -1, 2007 s->max_cert_list, 2008 &ok); 2009 2010 if (!ok) return((int)n); 2011 2012 s->s3->tmp.cert_req=0; 2013 2014 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE) 2015 { 2016 s->s3->tmp.reuse_message=1; 2017 /* If we get here we don't need any cached handshake records 2018 * as we wont be doing client auth. 2019 */ 2020 if (s->s3->handshake_buffer) 2021 { 2022 if (!ssl3_digest_cached_records(s)) 2023 goto err; 2024 } 2025 return(1); 2026 } 2027 2028 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) 2029 { 2030 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 2031 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE); 2032 goto err; 2033 } 2034 2035 /* TLS does not like anon-DH with client cert */ 2036 if (s->version > SSL3_VERSION) 2037 { 2038 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 2039 { 2040 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 2041 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 2042 goto err; 2043 } 2044 } 2045 2046 p=d=(unsigned char *)s->init_msg; 2047 2048 if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL) 2049 { 2050 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE); 2051 goto err; 2052 } 2053 2054 /* get the certificate types */ 2055 ctype_num= *(p++); 2056 if (ctype_num > SSL3_CT_NUMBER) 2057 ctype_num=SSL3_CT_NUMBER; 2058 for (i=0; i<ctype_num; i++) 2059 s->s3->tmp.ctype[i]= p[i]; 2060 p+=ctype_num; 2061 if (TLS1_get_version(s) >= TLS1_2_VERSION) 2062 { 2063 n2s(p, llen); 2064 /* Check we have enough room for signature algorithms and 2065 * following length value. 2066 */ 2067 if ((unsigned long)(p - d + llen + 2) > n) 2068 { 2069 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 2070 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG); 2071 goto err; 2072 } 2073 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen)) 2074 { 2075 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 2076 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2077 goto err; 2078 } 2079 p += llen; 2080 } 2081 2082 /* get the CA RDNs */ 2083 n2s(p,llen); 2084#if 0 2085{ 2086FILE *out; 2087out=fopen("/tmp/vsign.der","w"); 2088fwrite(p,1,llen,out); 2089fclose(out); 2090} 2091#endif 2092 2093 if ((unsigned long)(p - d + llen) != n) 2094 { 2095 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 2096 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH); 2097 goto err; 2098 } 2099 2100 for (nc=0; nc<llen; ) 2101 { 2102 n2s(p,l); 2103 if ((l+nc+2) > llen) 2104 { 2105 if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) 2106 goto cont; /* netscape bugs */ 2107 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 2108 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG); 2109 goto err; 2110 } 2111 2112 q=p; 2113 2114 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL) 2115 { 2116 /* If netscape tolerance is on, ignore errors */ 2117 if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG) 2118 goto cont; 2119 else 2120 { 2121 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 2122 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB); 2123 goto err; 2124 } 2125 } 2126 2127 if (q != (p+l)) 2128 { 2129 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 2130 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH); 2131 goto err; 2132 } 2133 if (!sk_X509_NAME_push(ca_sk,xn)) 2134 { 2135 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE); 2136 goto err; 2137 } 2138 2139 p+=l; 2140 nc+=l+2; 2141 } 2142 2143 if (0) 2144 { 2145cont: 2146 ERR_clear_error(); 2147 } 2148 2149 /* we should setup a certificate to return.... */ 2150 s->s3->tmp.cert_req=1; 2151 s->s3->tmp.ctype_num=ctype_num; 2152 if (s->s3->tmp.ca_names != NULL) 2153 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free); 2154 s->s3->tmp.ca_names=ca_sk; 2155 ca_sk=NULL; 2156 2157 ret=1; 2158err: 2159 if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free); 2160 return(ret); 2161 } 2162 2163static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 2164 { 2165 return(X509_NAME_cmp(*a,*b)); 2166 } 2167#ifndef OPENSSL_NO_TLSEXT 2168int ssl3_get_new_session_ticket(SSL *s) 2169 { 2170 int ok,al,ret=0, ticklen; 2171 long n; 2172 const unsigned char *p; 2173 unsigned char *d; 2174 2175 n=s->method->ssl_get_message(s, 2176 SSL3_ST_CR_SESSION_TICKET_A, 2177 SSL3_ST_CR_SESSION_TICKET_B, 2178 SSL3_MT_NEWSESSION_TICKET, 2179 16384, 2180 &ok); 2181 2182 if (!ok) 2183 return((int)n); 2184 2185 if (n < 6) 2186 { 2187 /* need at least ticket_lifetime_hint + ticket length */ 2188 al = SSL_AD_DECODE_ERROR; 2189 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH); 2190 goto f_err; 2191 } 2192 2193 p=d=(unsigned char *)s->init_msg; 2194 n2l(p, s->session->tlsext_tick_lifetime_hint); 2195 n2s(p, ticklen); 2196 /* ticket_lifetime_hint + ticket_length + ticket */ 2197 if (ticklen + 6 != n) 2198 { 2199 al = SSL_AD_DECODE_ERROR; 2200 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH); 2201 goto f_err; 2202 } 2203 if (s->session->tlsext_tick) 2204 { 2205 OPENSSL_free(s->session->tlsext_tick); 2206 s->session->tlsext_ticklen = 0; 2207 } 2208 s->session->tlsext_tick = OPENSSL_malloc(ticklen); 2209 if (!s->session->tlsext_tick) 2210 { 2211 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE); 2212 goto err; 2213 } 2214 memcpy(s->session->tlsext_tick, p, ticklen); 2215 s->session->tlsext_ticklen = ticklen; 2216 /* There are two ways to detect a resumed ticket session. 2217 * One is to set an appropriate session ID and then the server 2218 * must return a match in ServerHello. This allows the normal 2219 * client session ID matching to work and we know much 2220 * earlier that the ticket has been accepted. 2221 * 2222 * The other way is to set zero length session ID when the 2223 * ticket is presented and rely on the handshake to determine 2224 * session resumption. 2225 * 2226 * We choose the former approach because this fits in with 2227 * assumptions elsewhere in OpenSSL. The session ID is set 2228 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 2229 * ticket. 2230 */ 2231 EVP_Digest(p, ticklen, 2232 s->session->session_id, &s->session->session_id_length, 2233#ifndef OPENSSL_NO_SHA256 2234 EVP_sha256(), NULL); 2235#else 2236 EVP_sha1(), NULL); 2237#endif 2238 ret=1; 2239 return(ret); 2240f_err: 2241 ssl3_send_alert(s,SSL3_AL_FATAL,al); 2242err: 2243 return(-1); 2244 } 2245 2246int ssl3_get_cert_status(SSL *s) 2247 { 2248 int ok, al; 2249 unsigned long resplen,n; 2250 const unsigned char *p; 2251 2252 n=s->method->ssl_get_message(s, 2253 SSL3_ST_CR_CERT_STATUS_A, 2254 SSL3_ST_CR_CERT_STATUS_B, 2255 SSL3_MT_CERTIFICATE_STATUS, 2256 16384, 2257 &ok); 2258 2259 if (!ok) return((int)n); 2260 if (n < 4) 2261 { 2262 /* need at least status type + length */ 2263 al = SSL_AD_DECODE_ERROR; 2264 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH); 2265 goto f_err; 2266 } 2267 p = (unsigned char *)s->init_msg; 2268 if (*p++ != TLSEXT_STATUSTYPE_ocsp) 2269 { 2270 al = SSL_AD_DECODE_ERROR; 2271 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE); 2272 goto f_err; 2273 } 2274 n2l3(p, resplen); 2275 if (resplen + 4 != n) 2276 { 2277 al = SSL_AD_DECODE_ERROR; 2278 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH); 2279 goto f_err; 2280 } 2281 if (s->tlsext_ocsp_resp) 2282 OPENSSL_free(s->tlsext_ocsp_resp); 2283 s->tlsext_ocsp_resp = BUF_memdup(p, resplen); 2284 if (!s->tlsext_ocsp_resp) 2285 { 2286 al = SSL_AD_INTERNAL_ERROR; 2287 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE); 2288 goto f_err; 2289 } 2290 s->tlsext_ocsp_resplen = resplen; 2291 if (s->ctx->tlsext_status_cb) 2292 { 2293 int ret; 2294 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); 2295 if (ret == 0) 2296 { 2297 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 2298 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE); 2299 goto f_err; 2300 } 2301 if (ret < 0) 2302 { 2303 al = SSL_AD_INTERNAL_ERROR; 2304 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE); 2305 goto f_err; 2306 } 2307 } 2308 return 1; 2309f_err: 2310 ssl3_send_alert(s,SSL3_AL_FATAL,al); 2311 return(-1); 2312 } 2313#endif 2314 2315int ssl3_get_server_done(SSL *s) 2316 { 2317 int ok,ret=0; 2318 long n; 2319 2320 n=s->method->ssl_get_message(s, 2321 SSL3_ST_CR_SRVR_DONE_A, 2322 SSL3_ST_CR_SRVR_DONE_B, 2323 SSL3_MT_SERVER_DONE, 2324 30, /* should be very small, like 0 :-) */ 2325 &ok); 2326 2327 if (!ok) return((int)n); 2328 if (n > 0) 2329 { 2330 /* should contain no data */ 2331 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 2332 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH); 2333 return -1; 2334 } 2335 ret=1; 2336 return(ret); 2337 } 2338 2339 2340int ssl3_send_client_key_exchange(SSL *s) 2341 { 2342 unsigned char *p,*d; 2343 int n; 2344 unsigned long alg_k; 2345#ifndef OPENSSL_NO_RSA 2346 unsigned char *q; 2347 EVP_PKEY *pkey=NULL; 2348#endif 2349#ifndef OPENSSL_NO_KRB5 2350 KSSL_ERR kssl_err; 2351#endif /* OPENSSL_NO_KRB5 */ 2352#ifndef OPENSSL_NO_ECDH 2353 EC_KEY *clnt_ecdh = NULL; 2354 const EC_POINT *srvr_ecpoint = NULL; 2355 EVP_PKEY *srvr_pub_pkey = NULL; 2356 unsigned char *encodedPoint = NULL; 2357 int encoded_pt_len = 0; 2358 BN_CTX * bn_ctx = NULL; 2359#endif 2360 2361 if (s->state == SSL3_ST_CW_KEY_EXCH_A) 2362 { 2363 d=(unsigned char *)s->init_buf->data; 2364 p= &(d[4]); 2365 2366 alg_k=s->s3->tmp.new_cipher->algorithm_mkey; 2367 2368 /* Fool emacs indentation */ 2369 if (0) {} 2370#ifndef OPENSSL_NO_RSA 2371 else if (alg_k & SSL_kRSA) 2372 { 2373 RSA *rsa; 2374 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 2375 2376 if (s->session->sess_cert == NULL) 2377 { 2378 /* We should always have a server certificate with SSL_kRSA. */ 2379 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 2380 goto err; 2381 } 2382 2383 if (s->session->sess_cert->peer_rsa_tmp != NULL) 2384 rsa=s->session->sess_cert->peer_rsa_tmp; 2385 else 2386 { 2387 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 2388 if ((pkey == NULL) || 2389 (pkey->type != EVP_PKEY_RSA) || 2390 (pkey->pkey.rsa == NULL)) 2391 { 2392 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 2393 goto err; 2394 } 2395 rsa=pkey->pkey.rsa; 2396 EVP_PKEY_free(pkey); 2397 } 2398 2399 tmp_buf[0]=s->client_version>>8; 2400 tmp_buf[1]=s->client_version&0xff; 2401 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) 2402 goto err; 2403 2404 s->session->master_key_length=sizeof tmp_buf; 2405 2406 q=p; 2407 /* Fix buf for TLS and beyond */ 2408 if (s->version > SSL3_VERSION) 2409 p+=2; 2410 n=RSA_public_encrypt(sizeof tmp_buf, 2411 tmp_buf,p,rsa,RSA_PKCS1_PADDING); 2412#ifdef PKCS1_CHECK 2413 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++; 2414 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70; 2415#endif 2416 if (n <= 0) 2417 { 2418 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT); 2419 goto err; 2420 } 2421 2422 /* Fix buf for TLS and beyond */ 2423 if (s->version > SSL3_VERSION) 2424 { 2425 s2n(n,q); 2426 n+=2; 2427 } 2428 2429 s->session->master_key_length= 2430 s->method->ssl3_enc->generate_master_secret(s, 2431 s->session->master_key, 2432 tmp_buf,sizeof tmp_buf); 2433 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf); 2434 } 2435#endif 2436#ifndef OPENSSL_NO_KRB5 2437 else if (alg_k & SSL_kKRB5) 2438 { 2439 krb5_error_code krb5rc; 2440 KSSL_CTX *kssl_ctx = s->kssl_ctx; 2441 /* krb5_data krb5_ap_req; */ 2442 krb5_data *enc_ticket; 2443 krb5_data authenticator, *authp = NULL; 2444 EVP_CIPHER_CTX ciph_ctx; 2445 const EVP_CIPHER *enc = NULL; 2446 unsigned char iv[EVP_MAX_IV_LENGTH]; 2447 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 2448 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH 2449 + EVP_MAX_IV_LENGTH]; 2450 int padl, outl = sizeof(epms); 2451 2452 EVP_CIPHER_CTX_init(&ciph_ctx); 2453 2454#ifdef KSSL_DEBUG 2455 fprintf(stderr,"ssl3_send_client_key_exchange(%lx & %lx)\n", 2456 alg_k, SSL_kKRB5); 2457#endif /* KSSL_DEBUG */ 2458 2459 authp = NULL; 2460#ifdef KRB5SENDAUTH 2461 if (KRB5SENDAUTH) authp = &authenticator; 2462#endif /* KRB5SENDAUTH */ 2463 2464 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, 2465 &kssl_err); 2466 enc = kssl_map_enc(kssl_ctx->enctype); 2467 if (enc == NULL) 2468 goto err; 2469#ifdef KSSL_DEBUG 2470 { 2471 fprintf(stderr,"kssl_cget_tkt rtn %d\n", krb5rc); 2472 if (krb5rc && kssl_err.text) 2473 fprintf(stderr,"kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 2474 } 2475#endif /* KSSL_DEBUG */ 2476 2477 if (krb5rc) 2478 { 2479 ssl3_send_alert(s,SSL3_AL_FATAL, 2480 SSL_AD_HANDSHAKE_FAILURE); 2481 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2482 kssl_err.reason); 2483 goto err; 2484 } 2485 2486 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ 2487 ** in place of RFC 2712 KerberosWrapper, as in: 2488 ** 2489 ** Send ticket (copy to *p, set n = length) 2490 ** n = krb5_ap_req.length; 2491 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 2492 ** if (krb5_ap_req.data) 2493 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 2494 ** 2495 ** Now using real RFC 2712 KerberosWrapper 2496 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) 2497 ** Note: 2712 "opaque" types are here replaced 2498 ** with a 2-byte length followed by the value. 2499 ** Example: 2500 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 2501 ** Where "xx xx" = length bytes. Shown here with 2502 ** optional authenticator omitted. 2503 */ 2504 2505 /* KerberosWrapper.Ticket */ 2506 s2n(enc_ticket->length,p); 2507 memcpy(p, enc_ticket->data, enc_ticket->length); 2508 p+= enc_ticket->length; 2509 n = enc_ticket->length + 2; 2510 2511 /* KerberosWrapper.Authenticator */ 2512 if (authp && authp->length) 2513 { 2514 s2n(authp->length,p); 2515 memcpy(p, authp->data, authp->length); 2516 p+= authp->length; 2517 n+= authp->length + 2; 2518 2519 free(authp->data); 2520 authp->data = NULL; 2521 authp->length = 0; 2522 } 2523 else 2524 { 2525 s2n(0,p);/* null authenticator length */ 2526 n+=2; 2527 } 2528 2529 tmp_buf[0]=s->client_version>>8; 2530 tmp_buf[1]=s->client_version&0xff; 2531 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) 2532 goto err; 2533 2534 /* 20010420 VRS. Tried it this way; failed. 2535 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 2536 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 2537 ** kssl_ctx->length); 2538 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 2539 */ 2540 2541 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 2542 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL, 2543 kssl_ctx->key,iv); 2544 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf, 2545 sizeof tmp_buf); 2546 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl); 2547 outl += padl; 2548 if (outl > (int)sizeof epms) 2549 { 2550 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 2551 goto err; 2552 } 2553 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 2554 2555 /* KerberosWrapper.EncryptedPreMasterSecret */ 2556 s2n(outl,p); 2557 memcpy(p, epms, outl); 2558 p+=outl; 2559 n+=outl + 2; 2560 2561 s->session->master_key_length= 2562 s->method->ssl3_enc->generate_master_secret(s, 2563 s->session->master_key, 2564 tmp_buf, sizeof tmp_buf); 2565 2566 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 2567 OPENSSL_cleanse(epms, outl); 2568 } 2569#endif 2570#ifndef OPENSSL_NO_DH 2571 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 2572 { 2573 DH *dh_srvr,*dh_clnt; 2574 2575 if (s->session->sess_cert == NULL) 2576 { 2577 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 2578 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE); 2579 goto err; 2580 } 2581 2582 if (s->session->sess_cert->peer_dh_tmp != NULL) 2583 dh_srvr=s->session->sess_cert->peer_dh_tmp; 2584 else 2585 { 2586 /* we get them from the cert */ 2587 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 2588 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 2589 goto err; 2590 } 2591 2592 /* generate a new random key */ 2593 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL) 2594 { 2595 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 2596 goto err; 2597 } 2598 if (!DH_generate_key(dh_clnt)) 2599 { 2600 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 2601 DH_free(dh_clnt); 2602 goto err; 2603 } 2604 2605 /* use the 'p' output buffer for the DH key, but 2606 * make sure to clear it out afterwards */ 2607 2608 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt); 2609 2610 if (n <= 0) 2611 { 2612 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 2613 DH_free(dh_clnt); 2614 goto err; 2615 } 2616 2617 /* generate master key from the result */ 2618 s->session->master_key_length= 2619 s->method->ssl3_enc->generate_master_secret(s, 2620 s->session->master_key,p,n); 2621 /* clean up */ 2622 memset(p,0,n); 2623 2624 /* send off the data */ 2625 n=BN_num_bytes(dh_clnt->pub_key); 2626 s2n(n,p); 2627 BN_bn2bin(dh_clnt->pub_key,p); 2628 n+=2; 2629 2630 DH_free(dh_clnt); 2631 2632 /* perhaps clean things up a bit EAY EAY EAY EAY*/ 2633 } 2634#endif 2635 2636#ifndef OPENSSL_NO_ECDH 2637 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) 2638 { 2639 const EC_GROUP *srvr_group = NULL; 2640 EC_KEY *tkey; 2641 int ecdh_clnt_cert = 0; 2642 int field_size = 0; 2643 2644 if (s->session->sess_cert == NULL) 2645 { 2646 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 2647 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE); 2648 goto err; 2649 } 2650 2651 /* Did we send out the client's 2652 * ECDH share for use in premaster 2653 * computation as part of client certificate? 2654 * If so, set ecdh_clnt_cert to 1. 2655 */ 2656 if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 2657 { 2658 /* XXX: For now, we do not support client 2659 * authentication using ECDH certificates. 2660 * To add such support, one needs to add 2661 * code that checks for appropriate 2662 * conditions and sets ecdh_clnt_cert to 1. 2663 * For example, the cert have an ECC 2664 * key on the same curve as the server's 2665 * and the key should be authorized for 2666 * key agreement. 2667 * 2668 * One also needs to add code in ssl3_connect 2669 * to skip sending the certificate verify 2670 * message. 2671 * 2672 * if ((s->cert->key->privatekey != NULL) && 2673 * (s->cert->key->privatekey->type == 2674 * EVP_PKEY_EC) && ...) 2675 * ecdh_clnt_cert = 1; 2676 */ 2677 } 2678 2679 if (s->session->sess_cert->peer_ecdh_tmp != NULL) 2680 { 2681 tkey = s->session->sess_cert->peer_ecdh_tmp; 2682 } 2683 else 2684 { 2685 /* Get the Server Public Key from Cert */ 2686 srvr_pub_pkey = X509_get_pubkey(s->session-> \ 2687 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 2688 if ((srvr_pub_pkey == NULL) || 2689 (srvr_pub_pkey->type != EVP_PKEY_EC) || 2690 (srvr_pub_pkey->pkey.ec == NULL)) 2691 { 2692 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2693 ERR_R_INTERNAL_ERROR); 2694 goto err; 2695 } 2696 2697 tkey = srvr_pub_pkey->pkey.ec; 2698 } 2699 2700 srvr_group = EC_KEY_get0_group(tkey); 2701 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 2702 2703 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) 2704 { 2705 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2706 ERR_R_INTERNAL_ERROR); 2707 goto err; 2708 } 2709 2710 if ((clnt_ecdh=EC_KEY_new()) == NULL) 2711 { 2712 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 2713 goto err; 2714 } 2715 2716 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) 2717 { 2718 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 2719 goto err; 2720 } 2721 if (ecdh_clnt_cert) 2722 { 2723 /* Reuse key info from our certificate 2724 * We only need our private key to perform 2725 * the ECDH computation. 2726 */ 2727 const BIGNUM *priv_key; 2728 tkey = s->cert->key->privatekey->pkey.ec; 2729 priv_key = EC_KEY_get0_private_key(tkey); 2730 if (priv_key == NULL) 2731 { 2732 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 2733 goto err; 2734 } 2735 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) 2736 { 2737 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 2738 goto err; 2739 } 2740 } 2741 else 2742 { 2743 /* Generate a new ECDH key pair */ 2744 if (!(EC_KEY_generate_key(clnt_ecdh))) 2745 { 2746 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 2747 goto err; 2748 } 2749 } 2750 2751 /* use the 'p' output buffer for the ECDH key, but 2752 * make sure to clear it out afterwards 2753 */ 2754 2755 field_size = EC_GROUP_get_degree(srvr_group); 2756 if (field_size <= 0) 2757 { 2758 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2759 ERR_R_ECDH_LIB); 2760 goto err; 2761 } 2762 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL); 2763 if (n <= 0) 2764 { 2765 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2766 ERR_R_ECDH_LIB); 2767 goto err; 2768 } 2769 2770 /* generate master key from the result */ 2771 s->session->master_key_length = s->method->ssl3_enc \ 2772 -> generate_master_secret(s, 2773 s->session->master_key, 2774 p, n); 2775 2776 memset(p, 0, n); /* clean up */ 2777 2778 if (ecdh_clnt_cert) 2779 { 2780 /* Send empty client key exch message */ 2781 n = 0; 2782 } 2783 else 2784 { 2785 /* First check the size of encoding and 2786 * allocate memory accordingly. 2787 */ 2788 encoded_pt_len = 2789 EC_POINT_point2oct(srvr_group, 2790 EC_KEY_get0_public_key(clnt_ecdh), 2791 POINT_CONVERSION_UNCOMPRESSED, 2792 NULL, 0, NULL); 2793 2794 encodedPoint = (unsigned char *) 2795 OPENSSL_malloc(encoded_pt_len * 2796 sizeof(unsigned char)); 2797 bn_ctx = BN_CTX_new(); 2798 if ((encodedPoint == NULL) || 2799 (bn_ctx == NULL)) 2800 { 2801 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 2802 goto err; 2803 } 2804 2805 /* Encode the public key */ 2806 n = EC_POINT_point2oct(srvr_group, 2807 EC_KEY_get0_public_key(clnt_ecdh), 2808 POINT_CONVERSION_UNCOMPRESSED, 2809 encodedPoint, encoded_pt_len, bn_ctx); 2810 2811 *p = n; /* length of encoded point */ 2812 /* Encoded point will be copied here */ 2813 p += 1; 2814 /* copy the point */ 2815 memcpy((unsigned char *)p, encodedPoint, n); 2816 /* increment n to account for length field */ 2817 n += 1; 2818 } 2819 2820 /* Free allocated memory */ 2821 BN_CTX_free(bn_ctx); 2822 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 2823 if (clnt_ecdh != NULL) 2824 EC_KEY_free(clnt_ecdh); 2825 EVP_PKEY_free(srvr_pub_pkey); 2826 } 2827#endif /* !OPENSSL_NO_ECDH */ 2828 else if (alg_k & SSL_kGOST) 2829 { 2830 /* GOST key exchange message creation */ 2831 EVP_PKEY_CTX *pkey_ctx; 2832 X509 *peer_cert; 2833 size_t msglen; 2834 unsigned int md_len; 2835 int keytype; 2836 unsigned char premaster_secret[32],shared_ukm[32], tmp[256]; 2837 EVP_MD_CTX *ukm_hash; 2838 EVP_PKEY *pub_key; 2839 2840 /* Get server sertificate PKEY and create ctx from it */ 2841 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509; 2842 if (!peer_cert) 2843 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509; 2844 if (!peer_cert) { 2845 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2846 goto err; 2847 } 2848 2849 pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL); 2850 /* If we have send a certificate, and certificate key 2851 2852 * parameters match those of server certificate, use 2853 * certificate key for key exchange 2854 */ 2855 2856 /* Otherwise, generate ephemeral key pair */ 2857 2858 EVP_PKEY_encrypt_init(pkey_ctx); 2859 /* Generate session key */ 2860 RAND_bytes(premaster_secret,32); 2861 /* If we have client certificate, use its secret as peer key */ 2862 if (s->s3->tmp.cert_req && s->cert->key->privatekey) { 2863 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) { 2864 /* If there was an error - just ignore it. Ephemeral key 2865 * would be used 2866 */ 2867 ERR_clear_error(); 2868 } 2869 } 2870 /* Compute shared IV and store it in algorithm-specific 2871 * context data */ 2872 ukm_hash = EVP_MD_CTX_create(); 2873 EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94)); 2874 EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE); 2875 EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE); 2876 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2877 EVP_MD_CTX_destroy(ukm_hash); 2878 if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV, 2879 8,shared_ukm)<0) { 2880 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2881 SSL_R_LIBRARY_BUG); 2882 goto err; 2883 } 2884 /* Make GOST keytransport blob message */ 2885 /*Encapsulate it into sequence */ 2886 *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED; 2887 msglen=255; 2888 if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) { 2889 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2890 SSL_R_LIBRARY_BUG); 2891 goto err; 2892 } 2893 if (msglen >= 0x80) 2894 { 2895 *(p++)=0x81; 2896 *(p++)= msglen & 0xff; 2897 n=msglen+3; 2898 } 2899 else 2900 { 2901 *(p++)= msglen & 0xff; 2902 n=msglen+2; 2903 } 2904 memcpy(p, tmp, msglen); 2905 /* Check if pubkey from client certificate was used */ 2906 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) 2907 { 2908 /* Set flag "skip certificate verify" */ 2909 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2910 } 2911 EVP_PKEY_CTX_free(pkey_ctx); 2912 s->session->master_key_length= 2913 s->method->ssl3_enc->generate_master_secret(s, 2914 s->session->master_key,premaster_secret,32); 2915 EVP_PKEY_free(pub_key); 2916 2917 } 2918#ifndef OPENSSL_NO_SRP 2919 else if (alg_k & SSL_kSRP) 2920 { 2921 if (s->srp_ctx.A != NULL) 2922 { 2923 /* send off the data */ 2924 n=BN_num_bytes(s->srp_ctx.A); 2925 s2n(n,p); 2926 BN_bn2bin(s->srp_ctx.A,p); 2927 n+=2; 2928 } 2929 else 2930 { 2931 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 2932 goto err; 2933 } 2934 if (s->session->srp_username != NULL) 2935 OPENSSL_free(s->session->srp_username); 2936 s->session->srp_username = BUF_strdup(s->srp_ctx.login); 2937 if (s->session->srp_username == NULL) 2938 { 2939 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2940 ERR_R_MALLOC_FAILURE); 2941 goto err; 2942 } 2943 2944 if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0) 2945 { 2946 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 2947 goto err; 2948 } 2949 } 2950#endif 2951#ifndef OPENSSL_NO_PSK 2952 else if (alg_k & SSL_kPSK) 2953 { 2954 /* The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes 2955 * to return a \0-terminated identity. The last byte 2956 * is for us for simulating strnlen. */ 2957 char identity[PSK_MAX_IDENTITY_LEN + 2]; 2958 size_t identity_len; 2959 unsigned char *t = NULL; 2960 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4]; 2961 unsigned int pre_ms_len = 0, psk_len = 0; 2962 int psk_err = 1; 2963 2964 n = 0; 2965 if (s->psk_client_callback == NULL) 2966 { 2967 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2968 SSL_R_PSK_NO_CLIENT_CB); 2969 goto err; 2970 } 2971 2972 memset(identity, 0, sizeof(identity)); 2973 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint, 2974 identity, sizeof(identity) - 1, 2975 psk_or_pre_ms, sizeof(psk_or_pre_ms)); 2976 if (psk_len > PSK_MAX_PSK_LEN) 2977 { 2978 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2979 ERR_R_INTERNAL_ERROR); 2980 goto psk_err; 2981 } 2982 else if (psk_len == 0) 2983 { 2984 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2985 SSL_R_PSK_IDENTITY_NOT_FOUND); 2986 goto psk_err; 2987 } 2988 identity[PSK_MAX_IDENTITY_LEN + 1] = '\0'; 2989 identity_len = strlen(identity); 2990 if (identity_len > PSK_MAX_IDENTITY_LEN) 2991 { 2992 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2993 ERR_R_INTERNAL_ERROR); 2994 goto psk_err; 2995 } 2996 /* create PSK pre_master_secret */ 2997 pre_ms_len = 2+psk_len+2+psk_len; 2998 t = psk_or_pre_ms; 2999 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len); 3000 s2n(psk_len, t); 3001 memset(t, 0, psk_len); 3002 t+=psk_len; 3003 s2n(psk_len, t); 3004 3005 if (s->session->psk_identity_hint != NULL) 3006 OPENSSL_free(s->session->psk_identity_hint); 3007 s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint); 3008 if (s->ctx->psk_identity_hint != NULL && 3009 s->session->psk_identity_hint == NULL) 3010 { 3011 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3012 ERR_R_MALLOC_FAILURE); 3013 goto psk_err; 3014 } 3015 3016 if (s->session->psk_identity != NULL) 3017 OPENSSL_free(s->session->psk_identity); 3018 s->session->psk_identity = BUF_strdup(identity); 3019 if (s->session->psk_identity == NULL) 3020 { 3021 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3022 ERR_R_MALLOC_FAILURE); 3023 goto psk_err; 3024 } 3025 3026 s->session->master_key_length = 3027 s->method->ssl3_enc->generate_master_secret(s, 3028 s->session->master_key, 3029 psk_or_pre_ms, pre_ms_len); 3030 s2n(identity_len, p); 3031 memcpy(p, identity, identity_len); 3032 n = 2 + identity_len; 3033 psk_err = 0; 3034 psk_err: 3035 OPENSSL_cleanse(identity, sizeof(identity)); 3036 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 3037 if (psk_err != 0) 3038 { 3039 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 3040 goto err; 3041 } 3042 } 3043#endif 3044 else 3045 { 3046 ssl3_send_alert(s, SSL3_AL_FATAL, 3047 SSL_AD_HANDSHAKE_FAILURE); 3048 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3049 ERR_R_INTERNAL_ERROR); 3050 goto err; 3051 } 3052 3053 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 3054 l2n3(n,d); 3055 3056 s->state=SSL3_ST_CW_KEY_EXCH_B; 3057 /* number of bytes to write */ 3058 s->init_num=n+4; 3059 s->init_off=0; 3060 } 3061 3062 /* SSL3_ST_CW_KEY_EXCH_B */ 3063 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); 3064err: 3065#ifndef OPENSSL_NO_ECDH 3066 BN_CTX_free(bn_ctx); 3067 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 3068 if (clnt_ecdh != NULL) 3069 EC_KEY_free(clnt_ecdh); 3070 EVP_PKEY_free(srvr_pub_pkey); 3071#endif 3072 return(-1); 3073 } 3074 3075int ssl3_send_client_verify(SSL *s) 3076 { 3077 unsigned char *p,*d; 3078 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 3079 EVP_PKEY *pkey; 3080 EVP_PKEY_CTX *pctx=NULL; 3081 EVP_MD_CTX mctx; 3082 unsigned u=0; 3083 unsigned long n; 3084 int j; 3085 3086 EVP_MD_CTX_init(&mctx); 3087 3088 if (s->state == SSL3_ST_CW_CERT_VRFY_A) 3089 { 3090 d=(unsigned char *)s->init_buf->data; 3091 p= &(d[4]); 3092 pkey=s->cert->key->privatekey; 3093/* Create context from key and test if sha1 is allowed as digest */ 3094 pctx = EVP_PKEY_CTX_new(pkey,NULL); 3095 EVP_PKEY_sign_init(pctx); 3096 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0) 3097 { 3098 if (TLS1_get_version(s) < TLS1_2_VERSION) 3099 s->method->ssl3_enc->cert_verify_mac(s, 3100 NID_sha1, 3101 &(data[MD5_DIGEST_LENGTH])); 3102 } 3103 else 3104 { 3105 ERR_clear_error(); 3106 } 3107 /* For TLS v1.2 send signature algorithm and signature 3108 * using agreed digest and cached handshake records. 3109 */ 3110 if (TLS1_get_version(s) >= TLS1_2_VERSION) 3111 { 3112 long hdatalen = 0; 3113 void *hdata; 3114 const EVP_MD *md = s->cert->key->digest; 3115 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, 3116 &hdata); 3117 if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md)) 3118 { 3119 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, 3120 ERR_R_INTERNAL_ERROR); 3121 goto err; 3122 } 3123 p += 2; 3124#ifdef SSL_DEBUG 3125 fprintf(stderr, "Using TLS 1.2 with client alg %s\n", 3126 EVP_MD_name(md)); 3127#endif 3128 if (!EVP_SignInit_ex(&mctx, md, NULL) 3129 || !EVP_SignUpdate(&mctx, hdata, hdatalen) 3130 || !EVP_SignFinal(&mctx, p + 2, &u, pkey)) 3131 { 3132 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, 3133 ERR_R_EVP_LIB); 3134 goto err; 3135 } 3136 s2n(u,p); 3137 n = u + 4; 3138 if (!ssl3_digest_cached_records(s)) 3139 goto err; 3140 } 3141 else 3142#ifndef OPENSSL_NO_RSA 3143 if (pkey->type == EVP_PKEY_RSA) 3144 { 3145 s->method->ssl3_enc->cert_verify_mac(s, 3146 NID_md5, 3147 &(data[0])); 3148 if (RSA_sign(NID_md5_sha1, data, 3149 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, 3150 &(p[2]), &u, pkey->pkey.rsa) <= 0 ) 3151 { 3152 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB); 3153 goto err; 3154 } 3155 s2n(u,p); 3156 n=u+2; 3157 } 3158 else 3159#endif 3160#ifndef OPENSSL_NO_DSA 3161 if (pkey->type == EVP_PKEY_DSA) 3162 { 3163 if (!DSA_sign(pkey->save_type, 3164 &(data[MD5_DIGEST_LENGTH]), 3165 SHA_DIGEST_LENGTH,&(p[2]), 3166 (unsigned int *)&j,pkey->pkey.dsa)) 3167 { 3168 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB); 3169 goto err; 3170 } 3171 s2n(j,p); 3172 n=j+2; 3173 } 3174 else 3175#endif 3176#ifndef OPENSSL_NO_ECDSA 3177 if (pkey->type == EVP_PKEY_EC) 3178 { 3179 if (!ECDSA_sign(pkey->save_type, 3180 &(data[MD5_DIGEST_LENGTH]), 3181 SHA_DIGEST_LENGTH,&(p[2]), 3182 (unsigned int *)&j,pkey->pkey.ec)) 3183 { 3184 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, 3185 ERR_R_ECDSA_LIB); 3186 goto err; 3187 } 3188 s2n(j,p); 3189 n=j+2; 3190 } 3191 else 3192#endif 3193 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001) 3194 { 3195 unsigned char signbuf[64]; 3196 int i; 3197 size_t sigsize=64; 3198 s->method->ssl3_enc->cert_verify_mac(s, 3199 NID_id_GostR3411_94, 3200 data); 3201 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) { 3202 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, 3203 ERR_R_INTERNAL_ERROR); 3204 goto err; 3205 } 3206 for (i=63,j=0; i>=0; j++, i--) { 3207 p[2+j]=signbuf[i]; 3208 } 3209 s2n(j,p); 3210 n=j+2; 3211 } 3212 else 3213 { 3214 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR); 3215 goto err; 3216 } 3217 *(d++)=SSL3_MT_CERTIFICATE_VERIFY; 3218 l2n3(n,d); 3219 3220 s->state=SSL3_ST_CW_CERT_VRFY_B; 3221 s->init_num=(int)n+4; 3222 s->init_off=0; 3223 } 3224 EVP_MD_CTX_cleanup(&mctx); 3225 EVP_PKEY_CTX_free(pctx); 3226 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); 3227err: 3228 EVP_MD_CTX_cleanup(&mctx); 3229 EVP_PKEY_CTX_free(pctx); 3230 return(-1); 3231 } 3232 3233int ssl3_send_client_certificate(SSL *s) 3234 { 3235 X509 *x509=NULL; 3236 EVP_PKEY *pkey=NULL; 3237 int i; 3238 unsigned long l; 3239 3240 if (s->state == SSL3_ST_CW_CERT_A) 3241 { 3242 if ((s->cert == NULL) || 3243 (s->cert->key->x509 == NULL) || 3244 (s->cert->key->privatekey == NULL)) 3245 s->state=SSL3_ST_CW_CERT_B; 3246 else 3247 s->state=SSL3_ST_CW_CERT_C; 3248 } 3249 3250 /* We need to get a client cert */ 3251 if (s->state == SSL3_ST_CW_CERT_B) 3252 { 3253 /* If we get an error, we need to 3254 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 3255 * We then get retied later */ 3256 i=0; 3257 i = ssl_do_client_cert_cb(s, &x509, &pkey); 3258 if (i < 0) 3259 { 3260 s->rwstate=SSL_X509_LOOKUP; 3261 return(-1); 3262 } 3263 s->rwstate=SSL_NOTHING; 3264 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) 3265 { 3266 s->state=SSL3_ST_CW_CERT_B; 3267 if ( !SSL_use_certificate(s,x509) || 3268 !SSL_use_PrivateKey(s,pkey)) 3269 i=0; 3270 } 3271 else if (i == 1) 3272 { 3273 i=0; 3274 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 3275 } 3276 3277 if (x509 != NULL) X509_free(x509); 3278 if (pkey != NULL) EVP_PKEY_free(pkey); 3279 if (i == 0) 3280 { 3281 if (s->version == SSL3_VERSION) 3282 { 3283 s->s3->tmp.cert_req=0; 3284 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE); 3285 return(1); 3286 } 3287 else 3288 { 3289 s->s3->tmp.cert_req=2; 3290 } 3291 } 3292 3293 /* Ok, we have a cert */ 3294 s->state=SSL3_ST_CW_CERT_C; 3295 } 3296 3297 if (s->state == SSL3_ST_CW_CERT_C) 3298 { 3299 s->state=SSL3_ST_CW_CERT_D; 3300 l=ssl3_output_cert_chain(s, 3301 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509); 3302 if (!l) 3303 { 3304 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); 3305 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR); 3306 return 0; 3307 } 3308 s->init_num=(int)l; 3309 s->init_off=0; 3310 } 3311 /* SSL3_ST_CW_CERT_D */ 3312 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); 3313 } 3314 3315#define has_bits(i,m) (((i)&(m)) == (m)) 3316 3317int ssl3_check_cert_and_algorithm(SSL *s) 3318 { 3319 int i,idx; 3320 long alg_k,alg_a; 3321 EVP_PKEY *pkey=NULL; 3322 SESS_CERT *sc; 3323#ifndef OPENSSL_NO_RSA 3324 RSA *rsa; 3325#endif 3326#ifndef OPENSSL_NO_DH 3327 DH *dh; 3328#endif 3329 3330 alg_k=s->s3->tmp.new_cipher->algorithm_mkey; 3331 alg_a=s->s3->tmp.new_cipher->algorithm_auth; 3332 3333 /* we don't have a certificate */ 3334 if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK)) 3335 return(1); 3336 3337 sc=s->session->sess_cert; 3338 if (sc == NULL) 3339 { 3340 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR); 3341 goto err; 3342 } 3343 3344#ifndef OPENSSL_NO_RSA 3345 rsa=s->session->sess_cert->peer_rsa_tmp; 3346#endif 3347#ifndef OPENSSL_NO_DH 3348 dh=s->session->sess_cert->peer_dh_tmp; 3349#endif 3350 3351 /* This is the passed certificate */ 3352 3353 idx=sc->peer_cert_type; 3354#ifndef OPENSSL_NO_ECDH 3355 if (idx == SSL_PKEY_ECC) 3356 { 3357 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509, 3358 s) == 0) 3359 { /* check failed */ 3360 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT); 3361 goto f_err; 3362 } 3363 else 3364 { 3365 return 1; 3366 } 3367 } 3368#endif 3369 pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509); 3370 i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey); 3371 EVP_PKEY_free(pkey); 3372 3373 3374 /* Check that we have a certificate if we require one */ 3375 if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN)) 3376 { 3377 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT); 3378 goto f_err; 3379 } 3380#ifndef OPENSSL_NO_DSA 3381 else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN)) 3382 { 3383 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT); 3384 goto f_err; 3385 } 3386#endif 3387#ifndef OPENSSL_NO_RSA 3388 if ((alg_k & SSL_kRSA) && 3389 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL))) 3390 { 3391 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT); 3392 goto f_err; 3393 } 3394#endif 3395#ifndef OPENSSL_NO_DH 3396 if ((alg_k & SSL_kEDH) && 3397 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) 3398 { 3399 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY); 3400 goto f_err; 3401 } 3402 else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA)) 3403 { 3404 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT); 3405 goto f_err; 3406 } 3407#ifndef OPENSSL_NO_DSA 3408 else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA)) 3409 { 3410 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT); 3411 goto f_err; 3412 } 3413#endif 3414#endif 3415 3416 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP)) 3417 { 3418#ifndef OPENSSL_NO_RSA 3419 if (alg_k & SSL_kRSA) 3420 { 3421 if (rsa == NULL 3422 || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) 3423 { 3424 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY); 3425 goto f_err; 3426 } 3427 } 3428 else 3429#endif 3430#ifndef OPENSSL_NO_DH 3431 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 3432 { 3433 if (dh == NULL 3434 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) 3435 { 3436 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY); 3437 goto f_err; 3438 } 3439 } 3440 else 3441#endif 3442 { 3443 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 3444 goto f_err; 3445 } 3446 } 3447 return(1); 3448f_err: 3449 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 3450err: 3451 return(0); 3452 } 3453 3454#if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG) 3455int ssl3_send_next_proto(SSL *s) 3456 { 3457 unsigned int len, padding_len; 3458 unsigned char *d; 3459 3460 if (s->state == SSL3_ST_CW_NEXT_PROTO_A) 3461 { 3462 len = s->next_proto_negotiated_len; 3463 padding_len = 32 - ((len + 2) % 32); 3464 d = (unsigned char *)s->init_buf->data; 3465 d[4] = len; 3466 memcpy(d + 5, s->next_proto_negotiated, len); 3467 d[5 + len] = padding_len; 3468 memset(d + 6 + len, 0, padding_len); 3469 *(d++)=SSL3_MT_NEXT_PROTO; 3470 l2n3(2 + len + padding_len, d); 3471 s->state = SSL3_ST_CW_NEXT_PROTO_B; 3472 s->init_num = 4 + 2 + len + padding_len; 3473 s->init_off = 0; 3474 } 3475 3476 return ssl3_do_write(s, SSL3_RT_HANDSHAKE); 3477 } 3478#endif /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */ 3479 3480int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 3481 { 3482 int i = 0; 3483#ifndef OPENSSL_NO_ENGINE 3484 if (s->ctx->client_cert_engine) 3485 { 3486 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s, 3487 SSL_get_client_CA_list(s), 3488 px509, ppkey, NULL, NULL, NULL); 3489 if (i != 0) 3490 return i; 3491 } 3492#endif 3493 if (s->ctx->client_cert_cb) 3494 i = s->ctx->client_cert_cb(s,px509,ppkey); 3495 return i; 3496 } 3497