s3_srvr.c revision 109998
11590Srgrimes/* ssl/s3_srvr.c */ 21590Srgrimes/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 31590Srgrimes * All rights reserved. 41590Srgrimes * 51590Srgrimes * This package is an SSL implementation written 61590Srgrimes * by Eric Young (eay@cryptsoft.com). 71590Srgrimes * The implementation was written so as to conform with Netscapes SSL. 81590Srgrimes * 91590Srgrimes * This library is free for commercial and non-commercial use as long as 101590Srgrimes * the following conditions are aheared to. The following conditions 111590Srgrimes * apply to all code found in this distribution, be it the RC4, RSA, 121590Srgrimes * lhash, DES, etc., code; not just the SSL code. The SSL documentation 131590Srgrimes * included with this distribution is covered by the same copyright terms 141590Srgrimes * except that the holder is Tim Hudson (tjh@cryptsoft.com). 151590Srgrimes * 161590Srgrimes * Copyright remains Eric Young's, and as such any Copyright notices in 171590Srgrimes * the code are not to be removed. 181590Srgrimes * If this package is used in a product, Eric Young should be given attribution 191590Srgrimes * as the author of the parts of the library used. 201590Srgrimes * This can be in the form of a textual message at program startup or 211590Srgrimes * in documentation (online or textual) provided with the package. 221590Srgrimes * 231590Srgrimes * Redistribution and use in source and binary forms, with or without 241590Srgrimes * modification, are permitted provided that the following conditions 251590Srgrimes * are met: 261590Srgrimes * 1. Redistributions of source code must retain the copyright 271590Srgrimes * notice, this list of conditions and the following disclaimer. 281590Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 291590Srgrimes * notice, this list of conditions and the following disclaimer in the 3087693Smarkm * documentation and/or other materials provided with the distribution. 311590Srgrimes * 3. All advertising materials mentioning features or use of this software 3287693Smarkm * must display the following acknowledgement: 3387693Smarkm * "This product includes cryptographic software written by 341590Srgrimes * Eric Young (eay@cryptsoft.com)" 351590Srgrimes * The word 'cryptographic' can be left out if the rouines from the library 361590Srgrimes * being used are not cryptographic related :-). 371590Srgrimes * 4. If you include any Windows specific code (or a derivative thereof) from 3880381Ssheldonh * the apps directory (application code) you must include an acknowledgement: 3980381Ssheldonh * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 401590Srgrimes * 411590Srgrimes * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 421590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 431590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 441590Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 451590Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 461590Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 471590Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 481590Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 491590Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 501590Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 511590Srgrimes * SUCH DAMAGE. 521590Srgrimes * 531590Srgrimes * The licence and distribution terms for any publically available version or 541590Srgrimes * derivative of this code cannot be changed. i.e. this code cannot simply be 551590Srgrimes * copied and put under another distribution licence 561590Srgrimes * [including the GNU Public Licence.] 571590Srgrimes */ 581590Srgrimes/* ==================================================================== 59282950Sbapt * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved. 60282950Sbapt * 61282950Sbapt * Redistribution and use in source and binary forms, with or without 62282950Sbapt * modification, are permitted provided that the following conditions 63282950Sbapt * are met: 641590Srgrimes * 651590Srgrimes * 1. Redistributions of source code must retain the above copyright 661590Srgrimes * notice, this list of conditions and the following disclaimer. 671590Srgrimes * 681590Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 69282950Sbapt * notice, this list of conditions and the following disclaimer in 70282950Sbapt * the documentation and/or other materials provided with the 711590Srgrimes * distribution. 721590Srgrimes * 731590Srgrimes * 3. All advertising materials mentioning features or use of this 741590Srgrimes * software must display the following acknowledgment: 751590Srgrimes * "This product includes software developed by the OpenSSL Project 761590Srgrimes * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 771590Srgrimes * 781590Srgrimes * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 791590Srgrimes * endorse or promote products derived from this software without 801590Srgrimes * prior written permission. For written permission, please contact 81282950Sbapt * openssl-core@openssl.org. 821590Srgrimes * 831590Srgrimes * 5. Products derived from this software may not be called "OpenSSL" 841590Srgrimes * nor may "OpenSSL" appear in their names without prior written 851590Srgrimes * permission of the OpenSSL Project. 861590Srgrimes * 871590Srgrimes * 6. Redistributions of any form whatsoever must retain the following 881590Srgrimes * acknowledgment: 891590Srgrimes * "This product includes software developed by the OpenSSL Project 901590Srgrimes * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 911590Srgrimes * 921590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 931590Srgrimes * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 941590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 951590Srgrimes * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 961590Srgrimes * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 971590Srgrimes * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 981590Srgrimes * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 991590Srgrimes * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 1001590Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 1011590Srgrimes * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 1021590Srgrimes * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 1031590Srgrimes * OF THE POSSIBILITY OF SUCH DAMAGE. 10480381Ssheldonh * ==================================================================== 1051590Srgrimes * 1061590Srgrimes * This product includes cryptographic software written by Eric Young 1071590Srgrimes * (eay@cryptsoft.com). This product includes software written by Tim 1081590Srgrimes * Hudson (tjh@cryptsoft.com). 1091590Srgrimes * 1101590Srgrimes */ 1111590Srgrimes 1121590Srgrimes#define REUSE_CIPHER_BUG 1131590Srgrimes#define NETSCAPE_HANG_BUG 1141590Srgrimes 1151590Srgrimes 1161590Srgrimes#include <stdio.h> 1171590Srgrimes#include "ssl_locl.h" 1181590Srgrimes#include "kssl_lcl.h" 1191590Srgrimes#include <openssl/buffer.h> 1201590Srgrimes#include <openssl/rand.h> 1211590Srgrimes#include <openssl/objects.h> 1221590Srgrimes#include <openssl/evp.h> 1231590Srgrimes#include <openssl/x509.h> 1241590Srgrimes#include <openssl/krb5_asn.h> 1251590Srgrimes#include <openssl/md5.h> 1261590Srgrimes#include "cryptlib.h" 1271590Srgrimes 128282950Sbaptstatic SSL_METHOD *ssl3_get_server_method(int ver); 129282950Sbaptstatic int ssl3_get_client_hello(SSL *s); 1301590Srgrimesstatic int ssl3_check_client_hello(SSL *s); 1311590Srgrimesstatic int ssl3_send_server_hello(SSL *s); 1321590Srgrimesstatic int ssl3_send_server_key_exchange(SSL *s); 1331590Srgrimesstatic int ssl3_send_certificate_request(SSL *s); 1341590Srgrimesstatic int ssl3_send_server_done(SSL *s); 1351590Srgrimesstatic int ssl3_get_client_key_exchange(SSL *s); 1361590Srgrimesstatic int ssl3_get_client_certificate(SSL *s); 1371590Srgrimesstatic int ssl3_get_cert_verify(SSL *s); 1381590Srgrimesstatic int ssl3_send_hello_request(SSL *s); 1391590Srgrimes 14080381Ssheldonhstatic SSL_METHOD *ssl3_get_server_method(int ver) 1411590Srgrimes { 1421590Srgrimes if (ver == SSL3_VERSION) 1431590Srgrimes return(SSLv3_server_method()); 1441590Srgrimes else 1451590Srgrimes return(NULL); 1461590Srgrimes } 147282950Sbapt 1481590SrgrimesSSL_METHOD *SSLv3_server_method(void) 1491590Srgrimes { 1501590Srgrimes static int init=1; 1511590Srgrimes static SSL_METHOD SSLv3_server_data; 1521590Srgrimes 15380381Ssheldonh if (init) 1541590Srgrimes { 1551590Srgrimes CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD); 1561590Srgrimes 1571590Srgrimes if (init) 1581590Srgrimes { 1591590Srgrimes memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(), 1601590Srgrimes sizeof(SSL_METHOD)); 1611590Srgrimes SSLv3_server_data.ssl_accept=ssl3_accept; 16280381Ssheldonh SSLv3_server_data.get_ssl_method=ssl3_get_server_method; 1631590Srgrimes init=0; 1641590Srgrimes } 165282950Sbapt 1661590Srgrimes CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD); 1671590Srgrimes } 1681590Srgrimes return(&SSLv3_server_data); 1691590Srgrimes } 1701590Srgrimes 1711590Srgrimesint ssl3_accept(SSL *s) 1721590Srgrimes { 1731590Srgrimes BUF_MEM *buf; 1741590Srgrimes unsigned long l,Time=time(NULL); 1751590Srgrimes void (*cb)(const SSL *ssl,int type,int val)=NULL; 176282950Sbapt long num1; 177282950Sbapt int ret= -1; 1781590Srgrimes int new_state,state,skip=0; 1791590Srgrimes 1801590Srgrimes RAND_add(&Time,sizeof(Time),0); 1811590Srgrimes ERR_clear_error(); 1821590Srgrimes clear_sys_error(); 1831590Srgrimes 1841590Srgrimes if (s->info_callback != NULL) 1851590Srgrimes cb=s->info_callback; 1861590Srgrimes else if (s->ctx->info_callback != NULL) 1871590Srgrimes cb=s->ctx->info_callback; 1881590Srgrimes 1891590Srgrimes /* init things to blank */ 1901590Srgrimes s->in_handshake++; 1911590Srgrimes if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 1921590Srgrimes 1931590Srgrimes if (s->cert == NULL) 1941590Srgrimes { 1951590Srgrimes SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET); 1961590Srgrimes return(-1); 1971590Srgrimes } 1981590Srgrimes 1991590Srgrimes for (;;) 2001590Srgrimes { 2011590Srgrimes state=s->state; 2021590Srgrimes 203282950Sbapt switch (s->state) 2041590Srgrimes { 2051590Srgrimes case SSL_ST_RENEGOTIATE: 2061590Srgrimes s->new_session=1; 2071590Srgrimes /* s->state=SSL_ST_ACCEPT; */ 2081590Srgrimes 2091590Srgrimes case SSL_ST_BEFORE: 2101590Srgrimes case SSL_ST_ACCEPT: 2111590Srgrimes case SSL_ST_BEFORE|SSL_ST_ACCEPT: 2121590Srgrimes case SSL_ST_OK|SSL_ST_ACCEPT: 2131590Srgrimes 2141590Srgrimes s->server=1; 2151590Srgrimes if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 2161590Srgrimes 2171590Srgrimes if ((s->version>>8) != 3) 2181590Srgrimes { 2191590Srgrimes SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR); 2201590Srgrimes return -1; 221282950Sbapt } 222282950Sbapt s->type=SSL_ST_ACCEPT; 2231590Srgrimes 2241590Srgrimes if (s->init_buf == NULL) 2251590Srgrimes { 2261590Srgrimes if ((buf=BUF_MEM_new()) == NULL) 2271590Srgrimes { 2281590Srgrimes ret= -1; 2291590Srgrimes goto end; 2301590Srgrimes } 2311590Srgrimes if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 2321590Srgrimes { 2331590Srgrimes ret= -1; 2341590Srgrimes goto end; 2351590Srgrimes } 2361590Srgrimes s->init_buf=buf; 2371590Srgrimes } 2381590Srgrimes 2391590Srgrimes if (!ssl3_setup_buffers(s)) 2401590Srgrimes { 2411590Srgrimes ret= -1; 2421590Srgrimes goto end; 2431590Srgrimes } 2441590Srgrimes 2451590Srgrimes s->init_num=0; 2461590Srgrimes 2471590Srgrimes if (s->state != SSL_ST_RENEGOTIATE) 2481590Srgrimes { 2491590Srgrimes /* Ok, we now need to push on a buffering BIO so that 2501590Srgrimes * the output is sent in a way that TCP likes :-) 2511590Srgrimes */ 2521590Srgrimes if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; } 2531590Srgrimes 254282950Sbapt ssl3_init_finished_mac(s); 255282950Sbapt s->state=SSL3_ST_SR_CLNT_HELLO_A; 2561590Srgrimes s->ctx->stats.sess_accept++; 2571590Srgrimes } 2581590Srgrimes else 2591590Srgrimes { 2601590Srgrimes /* s->state == SSL_ST_RENEGOTIATE, 2611590Srgrimes * we will just send a HelloRequest */ 2621590Srgrimes s->ctx->stats.sess_accept_renegotiate++; 2631590Srgrimes s->state=SSL3_ST_SW_HELLO_REQ_A; 2641590Srgrimes } 2651590Srgrimes break; 2661590Srgrimes 2671590Srgrimes case SSL3_ST_SW_HELLO_REQ_A: 2681590Srgrimes case SSL3_ST_SW_HELLO_REQ_B: 2691590Srgrimes 2701590Srgrimes s->shutdown=0; 2711590Srgrimes ret=ssl3_send_hello_request(s); 2721590Srgrimes if (ret <= 0) goto end; 2731590Srgrimes s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C; 2741590Srgrimes s->state=SSL3_ST_SW_FLUSH; 2751590Srgrimes s->init_num=0; 2761590Srgrimes 2771590Srgrimes ssl3_init_finished_mac(s); 2781590Srgrimes break; 2791590Srgrimes 2801590Srgrimes case SSL3_ST_SW_HELLO_REQ_C: 281282950Sbapt s->state=SSL_ST_OK; 2821590Srgrimes break; 2831590Srgrimes 2841590Srgrimes case SSL3_ST_SR_CLNT_HELLO_A: 2851590Srgrimes case SSL3_ST_SR_CLNT_HELLO_B: 2861590Srgrimes case SSL3_ST_SR_CLNT_HELLO_C: 2871590Srgrimes 2881590Srgrimes s->shutdown=0; 2891590Srgrimes ret=ssl3_get_client_hello(s); 2901590Srgrimes if (ret <= 0) goto end; 2911590Srgrimes s->new_session = 2; 2921590Srgrimes s->state=SSL3_ST_SW_SRVR_HELLO_A; 2931590Srgrimes s->init_num=0; 2941590Srgrimes break; 2951590Srgrimes 2961590Srgrimes case SSL3_ST_SW_SRVR_HELLO_A: 2971590Srgrimes case SSL3_ST_SW_SRVR_HELLO_B: 2981590Srgrimes ret=ssl3_send_server_hello(s); 2991590Srgrimes if (ret <= 0) goto end; 3001590Srgrimes 3011590Srgrimes if (s->hit) 3021590Srgrimes s->state=SSL3_ST_SW_CHANGE_A; 3031590Srgrimes else 3041590Srgrimes s->state=SSL3_ST_SW_CERT_A; 305282950Sbapt s->init_num=0; 3061590Srgrimes break; 3071590Srgrimes 3081590Srgrimes case SSL3_ST_SW_CERT_A: 3091590Srgrimes case SSL3_ST_SW_CERT_B: 3101590Srgrimes /* Check if it is anon DH */ 3111590Srgrimes if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) 3121590Srgrimes { 3131590Srgrimes ret=ssl3_send_server_certificate(s); 3141590Srgrimes if (ret <= 0) goto end; 3151590Srgrimes } 3161590Srgrimes else 3171590Srgrimes skip=1; 3181590Srgrimes s->state=SSL3_ST_SW_KEY_EXCH_A; 3191590Srgrimes s->init_num=0; 3201590Srgrimes break; 321 322 case SSL3_ST_SW_KEY_EXCH_A: 323 case SSL3_ST_SW_KEY_EXCH_B: 324 l=s->s3->tmp.new_cipher->algorithms; 325 326 /* clear this, it may get reset by 327 * send_server_key_exchange */ 328 if ((s->options & SSL_OP_EPHEMERAL_RSA) 329#ifndef OPENSSL_NO_KRB5 330 && !(l & SSL_KRB5) 331#endif /* OPENSSL_NO_KRB5 */ 332 ) 333 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key 334 * even when forbidden by protocol specs 335 * (handshake may fail as clients are not required to 336 * be able to handle this) */ 337 s->s3->tmp.use_rsa_tmp=1; 338 else 339 s->s3->tmp.use_rsa_tmp=0; 340 341 /* only send if a DH key exchange, fortezza or 342 * RSA but we have a sign only certificate */ 343 if (s->s3->tmp.use_rsa_tmp 344 || (l & (SSL_DH|SSL_kFZA)) 345 || ((l & SSL_kRSA) 346 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL 347 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) 348 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) 349 ) 350 ) 351 ) 352 ) 353 { 354 ret=ssl3_send_server_key_exchange(s); 355 if (ret <= 0) goto end; 356 } 357 else 358 skip=1; 359 360 s->state=SSL3_ST_SW_CERT_REQ_A; 361 s->init_num=0; 362 break; 363 364 case SSL3_ST_SW_CERT_REQ_A: 365 case SSL3_ST_SW_CERT_REQ_B: 366 if (/* don't request cert unless asked for it: */ 367 !(s->verify_mode & SSL_VERIFY_PEER) || 368 /* if SSL_VERIFY_CLIENT_ONCE is set, 369 * don't request cert during re-negotiation: */ 370 ((s->session->peer != NULL) && 371 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 372 /* never request cert in anonymous ciphersuites 373 * (see section "Certificate request" in SSL 3 drafts 374 * and in RFC 2246): */ 375 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) && 376 /* ... except when the application insists on verification 377 * (against the specs, but s3_clnt.c accepts this for SSL 3) */ 378 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || 379 /* never request cert in Kerberos ciphersuites */ 380 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5)) 381 { 382 /* no cert request */ 383 skip=1; 384 s->s3->tmp.cert_request=0; 385 s->state=SSL3_ST_SW_SRVR_DONE_A; 386 } 387 else 388 { 389 s->s3->tmp.cert_request=1; 390 ret=ssl3_send_certificate_request(s); 391 if (ret <= 0) goto end; 392#ifndef NETSCAPE_HANG_BUG 393 s->state=SSL3_ST_SW_SRVR_DONE_A; 394#else 395 s->state=SSL3_ST_SW_FLUSH; 396 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 397#endif 398 s->init_num=0; 399 } 400 break; 401 402 case SSL3_ST_SW_SRVR_DONE_A: 403 case SSL3_ST_SW_SRVR_DONE_B: 404 ret=ssl3_send_server_done(s); 405 if (ret <= 0) goto end; 406 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 407 s->state=SSL3_ST_SW_FLUSH; 408 s->init_num=0; 409 break; 410 411 case SSL3_ST_SW_FLUSH: 412 /* number of bytes to be flushed */ 413 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL); 414 if (num1 > 0) 415 { 416 s->rwstate=SSL_WRITING; 417 num1=BIO_flush(s->wbio); 418 if (num1 <= 0) { ret= -1; goto end; } 419 s->rwstate=SSL_NOTHING; 420 } 421 422 s->state=s->s3->tmp.next_state; 423 break; 424 425 case SSL3_ST_SR_CERT_A: 426 case SSL3_ST_SR_CERT_B: 427 /* Check for second client hello (MS SGC) */ 428 ret = ssl3_check_client_hello(s); 429 if (ret <= 0) 430 goto end; 431 if (ret == 2) 432 s->state = SSL3_ST_SR_CLNT_HELLO_C; 433 else { 434 /* could be sent for a DH cert, even if we 435 * have not asked for it :-) */ 436 ret=ssl3_get_client_certificate(s); 437 if (ret <= 0) goto end; 438 s->init_num=0; 439 s->state=SSL3_ST_SR_KEY_EXCH_A; 440 } 441 break; 442 443 case SSL3_ST_SR_KEY_EXCH_A: 444 case SSL3_ST_SR_KEY_EXCH_B: 445 ret=ssl3_get_client_key_exchange(s); 446 if (ret <= 0) goto end; 447 s->state=SSL3_ST_SR_CERT_VRFY_A; 448 s->init_num=0; 449 450 /* We need to get hashes here so if there is 451 * a client cert, it can be verified */ 452 s->method->ssl3_enc->cert_verify_mac(s, 453 &(s->s3->finish_dgst1), 454 &(s->s3->tmp.cert_verify_md[0])); 455 s->method->ssl3_enc->cert_verify_mac(s, 456 &(s->s3->finish_dgst2), 457 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH])); 458 459 break; 460 461 case SSL3_ST_SR_CERT_VRFY_A: 462 case SSL3_ST_SR_CERT_VRFY_B: 463 464 /* we should decide if we expected this one */ 465 ret=ssl3_get_cert_verify(s); 466 if (ret <= 0) goto end; 467 468 s->state=SSL3_ST_SR_FINISHED_A; 469 s->init_num=0; 470 break; 471 472 case SSL3_ST_SR_FINISHED_A: 473 case SSL3_ST_SR_FINISHED_B: 474 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A, 475 SSL3_ST_SR_FINISHED_B); 476 if (ret <= 0) goto end; 477 if (s->hit) 478 s->state=SSL_ST_OK; 479 else 480 s->state=SSL3_ST_SW_CHANGE_A; 481 s->init_num=0; 482 break; 483 484 case SSL3_ST_SW_CHANGE_A: 485 case SSL3_ST_SW_CHANGE_B: 486 487 s->session->cipher=s->s3->tmp.new_cipher; 488 if (!s->method->ssl3_enc->setup_key_block(s)) 489 { ret= -1; goto end; } 490 491 ret=ssl3_send_change_cipher_spec(s, 492 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B); 493 494 if (ret <= 0) goto end; 495 s->state=SSL3_ST_SW_FINISHED_A; 496 s->init_num=0; 497 498 if (!s->method->ssl3_enc->change_cipher_state(s, 499 SSL3_CHANGE_CIPHER_SERVER_WRITE)) 500 { 501 ret= -1; 502 goto end; 503 } 504 505 break; 506 507 case SSL3_ST_SW_FINISHED_A: 508 case SSL3_ST_SW_FINISHED_B: 509 ret=ssl3_send_finished(s, 510 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B, 511 s->method->ssl3_enc->server_finished_label, 512 s->method->ssl3_enc->server_finished_label_len); 513 if (ret <= 0) goto end; 514 s->state=SSL3_ST_SW_FLUSH; 515 if (s->hit) 516 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A; 517 else 518 s->s3->tmp.next_state=SSL_ST_OK; 519 s->init_num=0; 520 break; 521 522 case SSL_ST_OK: 523 /* clean a few things up */ 524 ssl3_cleanup_key_block(s); 525 526 BUF_MEM_free(s->init_buf); 527 s->init_buf=NULL; 528 529 /* remove buffering on output */ 530 ssl_free_wbio_buffer(s); 531 532 s->init_num=0; 533 534 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */ 535 { 536 /* actually not necessarily a 'new' session unless 537 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */ 538 539 s->new_session=0; 540 541 ssl_update_cache(s,SSL_SESS_CACHE_SERVER); 542 543 s->ctx->stats.sess_accept_good++; 544 /* s->server=1; */ 545 s->handshake_func=ssl3_accept; 546 547 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 548 } 549 550 ret = 1; 551 goto end; 552 /* break; */ 553 554 default: 555 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE); 556 ret= -1; 557 goto end; 558 /* break; */ 559 } 560 561 if (!s->s3->tmp.reuse_message && !skip) 562 { 563 if (s->debug) 564 { 565 if ((ret=BIO_flush(s->wbio)) <= 0) 566 goto end; 567 } 568 569 570 if ((cb != NULL) && (s->state != state)) 571 { 572 new_state=s->state; 573 s->state=state; 574 cb(s,SSL_CB_ACCEPT_LOOP,1); 575 s->state=new_state; 576 } 577 } 578 skip=0; 579 } 580end: 581 /* BIO_flush(s->wbio); */ 582 583 s->in_handshake--; 584 if (cb != NULL) 585 cb(s,SSL_CB_ACCEPT_EXIT,ret); 586 return(ret); 587 } 588 589static int ssl3_send_hello_request(SSL *s) 590 { 591 unsigned char *p; 592 593 if (s->state == SSL3_ST_SW_HELLO_REQ_A) 594 { 595 p=(unsigned char *)s->init_buf->data; 596 *(p++)=SSL3_MT_HELLO_REQUEST; 597 *(p++)=0; 598 *(p++)=0; 599 *(p++)=0; 600 601 s->state=SSL3_ST_SW_HELLO_REQ_B; 602 /* number of bytes to write */ 603 s->init_num=4; 604 s->init_off=0; 605 } 606 607 /* SSL3_ST_SW_HELLO_REQ_B */ 608 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); 609 } 610 611static int ssl3_check_client_hello(SSL *s) 612 { 613 int ok; 614 long n; 615 616 /* this function is called when we really expect a Certificate message, 617 * so permit appropriate message length */ 618 n=ssl3_get_message(s, 619 SSL3_ST_SR_CERT_A, 620 SSL3_ST_SR_CERT_B, 621 -1, 622 s->max_cert_list, 623 &ok); 624 if (!ok) return((int)n); 625 s->s3->tmp.reuse_message = 1; 626 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO) 627 { 628 /* Throw away what we have done so far in the current handshake, 629 * which will now be aborted. (A full SSL_clear would be too much.) 630 * I hope that tmp.dh is the only thing that may need to be cleared 631 * when a handshake is not completed ... */ 632#ifndef OPENSSL_NO_DH 633 if (s->s3->tmp.dh != NULL) 634 { 635 DH_free(s->s3->tmp.dh); 636 s->s3->tmp.dh = NULL; 637 } 638#endif 639 return 2; 640 } 641 return 1; 642} 643 644static int ssl3_get_client_hello(SSL *s) 645 { 646 int i,j,ok,al,ret= -1; 647 long n; 648 unsigned long id; 649 unsigned char *p,*d,*q; 650 SSL_CIPHER *c; 651 SSL_COMP *comp=NULL; 652 STACK_OF(SSL_CIPHER) *ciphers=NULL; 653 654 /* We do this so that we will respond with our native type. 655 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1, 656 * This down switching should be handled by a different method. 657 * If we are SSLv3, we will respond with SSLv3, even if prompted with 658 * TLSv1. 659 */ 660 if (s->state == SSL3_ST_SR_CLNT_HELLO_A) 661 { 662 s->first_packet=1; 663 s->state=SSL3_ST_SR_CLNT_HELLO_B; 664 } 665 n=ssl3_get_message(s, 666 SSL3_ST_SR_CLNT_HELLO_B, 667 SSL3_ST_SR_CLNT_HELLO_C, 668 SSL3_MT_CLIENT_HELLO, 669 SSL3_RT_MAX_PLAIN_LENGTH, 670 &ok); 671 672 if (!ok) return((int)n); 673 d=p=(unsigned char *)s->init_msg; 674 675 /* use version from inside client hello, not from record header 676 * (may differ: see RFC 2246, Appendix E, second paragraph) */ 677 s->client_version=(((int)p[0])<<8)|(int)p[1]; 678 p+=2; 679 680 if (s->client_version < s->version) 681 { 682 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER); 683 if ((s->client_version>>8) == SSL3_VERSION_MAJOR) 684 { 685 /* similar to ssl3_get_record, send alert using remote version number */ 686 s->version = s->client_version; 687 } 688 al = SSL_AD_PROTOCOL_VERSION; 689 goto f_err; 690 } 691 692 /* load the client random */ 693 memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE); 694 p+=SSL3_RANDOM_SIZE; 695 696 /* get the session-id */ 697 j= *(p++); 698 699 s->hit=0; 700 /* Versions before 0.9.7 always allow session reuse during renegotiation 701 * (i.e. when s->new_session is true), option 702 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7. 703 * Maybe this optional behaviour should always have been the default, 704 * but we cannot safely change the default behaviour (or new applications 705 * might be written that become totally unsecure when compiled with 706 * an earlier library version) 707 */ 708 if (j == 0 || (s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) 709 { 710 if (!ssl_get_new_session(s,1)) 711 goto err; 712 } 713 else 714 { 715 i=ssl_get_prev_session(s,p,j); 716 if (i == 1) 717 { /* previous session */ 718 s->hit=1; 719 } 720 else if (i == -1) 721 goto err; 722 else /* i == 0 */ 723 { 724 if (!ssl_get_new_session(s,1)) 725 goto err; 726 } 727 } 728 729 p+=j; 730 n2s(p,i); 731 if ((i == 0) && (j != 0)) 732 { 733 /* we need a cipher if we are not resuming a session */ 734 al=SSL_AD_ILLEGAL_PARAMETER; 735 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED); 736 goto f_err; 737 } 738 if ((p+i) >= (d+n)) 739 { 740 /* not enough data */ 741 al=SSL_AD_DECODE_ERROR; 742 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH); 743 goto f_err; 744 } 745 if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers)) 746 == NULL)) 747 { 748 goto err; 749 } 750 p+=i; 751 752 /* If it is a hit, check that the cipher is in the list */ 753 if ((s->hit) && (i > 0)) 754 { 755 j=0; 756 id=s->session->cipher->id; 757 758#ifdef CIPHER_DEBUG 759 printf("client sent %d ciphers\n",sk_num(ciphers)); 760#endif 761 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++) 762 { 763 c=sk_SSL_CIPHER_value(ciphers,i); 764#ifdef CIPHER_DEBUG 765 printf("client [%2d of %2d]:%s\n", 766 i,sk_num(ciphers),SSL_CIPHER_get_name(c)); 767#endif 768 if (c->id == id) 769 { 770 j=1; 771 break; 772 } 773 } 774 if (j == 0) 775 { 776 if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1)) 777 { 778 /* Very bad for multi-threading.... */ 779 s->session->cipher=sk_SSL_CIPHER_value(ciphers, 780 0); 781 } 782 else 783 { 784 /* we need to have the cipher in the cipher 785 * list if we are asked to reuse it */ 786 al=SSL_AD_ILLEGAL_PARAMETER; 787 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING); 788 goto f_err; 789 } 790 } 791 } 792 793 /* compression */ 794 i= *(p++); 795 if ((p+i) > (d+n)) 796 { 797 /* not enough data */ 798 al=SSL_AD_DECODE_ERROR; 799 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH); 800 goto f_err; 801 } 802 q=p; 803 for (j=0; j<i; j++) 804 { 805 if (p[j] == 0) break; 806 } 807 808 p+=i; 809 if (j >= i) 810 { 811 /* no compress */ 812 al=SSL_AD_DECODE_ERROR; 813 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED); 814 goto f_err; 815 } 816 817 /* Worst case, we will use the NULL compression, but if we have other 818 * options, we will now look for them. We have i-1 compression 819 * algorithms from the client, starting at q. */ 820 s->s3->tmp.new_compression=NULL; 821 if (s->ctx->comp_methods != NULL) 822 { /* See if we have a match */ 823 int m,nn,o,v,done=0; 824 825 nn=sk_SSL_COMP_num(s->ctx->comp_methods); 826 for (m=0; m<nn; m++) 827 { 828 comp=sk_SSL_COMP_value(s->ctx->comp_methods,m); 829 v=comp->id; 830 for (o=0; o<i; o++) 831 { 832 if (v == q[o]) 833 { 834 done=1; 835 break; 836 } 837 } 838 if (done) break; 839 } 840 if (done) 841 s->s3->tmp.new_compression=comp; 842 else 843 comp=NULL; 844 } 845 846 /* TLS does not mind if there is extra stuff */ 847 if (s->version == SSL3_VERSION) 848 { 849 if (p < (d+n)) 850 { 851 /* wrong number of bytes, 852 * there could be more to follow */ 853 al=SSL_AD_DECODE_ERROR; 854 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH); 855 goto f_err; 856 } 857 } 858 859 /* Given s->session->ciphers and SSL_get_ciphers, we must 860 * pick a cipher */ 861 862 if (!s->hit) 863 { 864 s->session->compress_meth=(comp == NULL)?0:comp->id; 865 if (s->session->ciphers != NULL) 866 sk_SSL_CIPHER_free(s->session->ciphers); 867 s->session->ciphers=ciphers; 868 if (ciphers == NULL) 869 { 870 al=SSL_AD_ILLEGAL_PARAMETER; 871 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED); 872 goto f_err; 873 } 874 ciphers=NULL; 875 c=ssl3_choose_cipher(s,s->session->ciphers, 876 SSL_get_ciphers(s)); 877 878 if (c == NULL) 879 { 880 al=SSL_AD_HANDSHAKE_FAILURE; 881 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER); 882 goto f_err; 883 } 884 s->s3->tmp.new_cipher=c; 885 } 886 else 887 { 888 /* Session-id reuse */ 889#ifdef REUSE_CIPHER_BUG 890 STACK_OF(SSL_CIPHER) *sk; 891 SSL_CIPHER *nc=NULL; 892 SSL_CIPHER *ec=NULL; 893 894 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG) 895 { 896 sk=s->session->ciphers; 897 for (i=0; i<sk_SSL_CIPHER_num(sk); i++) 898 { 899 c=sk_SSL_CIPHER_value(sk,i); 900 if (c->algorithms & SSL_eNULL) 901 nc=c; 902 if (SSL_C_IS_EXPORT(c)) 903 ec=c; 904 } 905 if (nc != NULL) 906 s->s3->tmp.new_cipher=nc; 907 else if (ec != NULL) 908 s->s3->tmp.new_cipher=ec; 909 else 910 s->s3->tmp.new_cipher=s->session->cipher; 911 } 912 else 913#endif 914 s->s3->tmp.new_cipher=s->session->cipher; 915 } 916 917 /* we now have the following setup. 918 * client_random 919 * cipher_list - our prefered list of ciphers 920 * ciphers - the clients prefered list of ciphers 921 * compression - basically ignored right now 922 * ssl version is set - sslv3 923 * s->session - The ssl session has been setup. 924 * s->hit - session reuse flag 925 * s->tmp.new_cipher - the new cipher to use. 926 */ 927 928 ret=1; 929 if (0) 930 { 931f_err: 932 ssl3_send_alert(s,SSL3_AL_FATAL,al); 933 } 934err: 935 if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers); 936 return(ret); 937 } 938 939static int ssl3_send_server_hello(SSL *s) 940 { 941 unsigned char *buf; 942 unsigned char *p,*d; 943 int i,sl; 944 unsigned long l,Time; 945 946 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) 947 { 948 buf=(unsigned char *)s->init_buf->data; 949 p=s->s3->server_random; 950 Time=time(NULL); /* Time */ 951 l2n(Time,p); 952 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time)); 953 /* Do the message type and length last */ 954 d=p= &(buf[4]); 955 956 *(p++)=s->version>>8; 957 *(p++)=s->version&0xff; 958 959 /* Random stuff */ 960 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 961 p+=SSL3_RANDOM_SIZE; 962 963 /* now in theory we have 3 options to sending back the 964 * session id. If it is a re-use, we send back the 965 * old session-id, if it is a new session, we send 966 * back the new session-id or we send back a 0 length 967 * session-id if we want it to be single use. 968 * Currently I will not implement the '0' length session-id 969 * 12-Jan-98 - I'll now support the '0' length stuff. 970 */ 971 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) 972 s->session->session_id_length=0; 973 974 sl=s->session->session_id_length; 975 if (sl > sizeof s->session->session_id) 976 { 977 SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 978 return -1; 979 } 980 *(p++)=sl; 981 memcpy(p,s->session->session_id,sl); 982 p+=sl; 983 984 /* put the cipher */ 985 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p); 986 p+=i; 987 988 /* put the compression method */ 989 if (s->s3->tmp.new_compression == NULL) 990 *(p++)=0; 991 else 992 *(p++)=s->s3->tmp.new_compression->id; 993 994 /* do the header */ 995 l=(p-d); 996 d=buf; 997 *(d++)=SSL3_MT_SERVER_HELLO; 998 l2n3(l,d); 999 1000 s->state=SSL3_ST_CW_CLNT_HELLO_B; 1001 /* number of bytes to write */ 1002 s->init_num=p-buf; 1003 s->init_off=0; 1004 } 1005 1006 /* SSL3_ST_CW_CLNT_HELLO_B */ 1007 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); 1008 } 1009 1010static int ssl3_send_server_done(SSL *s) 1011 { 1012 unsigned char *p; 1013 1014 if (s->state == SSL3_ST_SW_SRVR_DONE_A) 1015 { 1016 p=(unsigned char *)s->init_buf->data; 1017 1018 /* do the header */ 1019 *(p++)=SSL3_MT_SERVER_DONE; 1020 *(p++)=0; 1021 *(p++)=0; 1022 *(p++)=0; 1023 1024 s->state=SSL3_ST_SW_SRVR_DONE_B; 1025 /* number of bytes to write */ 1026 s->init_num=4; 1027 s->init_off=0; 1028 } 1029 1030 /* SSL3_ST_CW_CLNT_HELLO_B */ 1031 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); 1032 } 1033 1034static int ssl3_send_server_key_exchange(SSL *s) 1035 { 1036#ifndef OPENSSL_NO_RSA 1037 unsigned char *q; 1038 int j,num; 1039 RSA *rsa; 1040 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1041 unsigned int u; 1042#endif 1043#ifndef OPENSSL_NO_DH 1044 DH *dh=NULL,*dhp; 1045#endif 1046 EVP_PKEY *pkey; 1047 unsigned char *p,*d; 1048 int al,i; 1049 unsigned long type; 1050 int n; 1051 CERT *cert; 1052 BIGNUM *r[4]; 1053 int nr[4],kn; 1054 BUF_MEM *buf; 1055 EVP_MD_CTX md_ctx; 1056 1057 EVP_MD_CTX_init(&md_ctx); 1058 if (s->state == SSL3_ST_SW_KEY_EXCH_A) 1059 { 1060 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK; 1061 cert=s->cert; 1062 1063 buf=s->init_buf; 1064 1065 r[0]=r[1]=r[2]=r[3]=NULL; 1066 n=0; 1067#ifndef OPENSSL_NO_RSA 1068 if (type & SSL_kRSA) 1069 { 1070 rsa=cert->rsa_tmp; 1071 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) 1072 { 1073 rsa=s->cert->rsa_tmp_cb(s, 1074 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1075 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1076 if(rsa == NULL) 1077 { 1078 al=SSL_AD_HANDSHAKE_FAILURE; 1079 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY); 1080 goto f_err; 1081 } 1082 RSA_up_ref(rsa); 1083 cert->rsa_tmp=rsa; 1084 } 1085 if (rsa == NULL) 1086 { 1087 al=SSL_AD_HANDSHAKE_FAILURE; 1088 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY); 1089 goto f_err; 1090 } 1091 r[0]=rsa->n; 1092 r[1]=rsa->e; 1093 s->s3->tmp.use_rsa_tmp=1; 1094 } 1095 else 1096#endif 1097#ifndef OPENSSL_NO_DH 1098 if (type & SSL_kEDH) 1099 { 1100 dhp=cert->dh_tmp; 1101 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) 1102 dhp=s->cert->dh_tmp_cb(s, 1103 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1104 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1105 if (dhp == NULL) 1106 { 1107 al=SSL_AD_HANDSHAKE_FAILURE; 1108 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY); 1109 goto f_err; 1110 } 1111 1112 if (s->s3->tmp.dh != NULL) 1113 { 1114 DH_free(dh); 1115 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1116 goto err; 1117 } 1118 1119 if ((dh=DHparams_dup(dhp)) == NULL) 1120 { 1121 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 1122 goto err; 1123 } 1124 1125 s->s3->tmp.dh=dh; 1126 if ((dhp->pub_key == NULL || 1127 dhp->priv_key == NULL || 1128 (s->options & SSL_OP_SINGLE_DH_USE))) 1129 { 1130 if(!DH_generate_key(dh)) 1131 { 1132 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, 1133 ERR_R_DH_LIB); 1134 goto err; 1135 } 1136 } 1137 else 1138 { 1139 dh->pub_key=BN_dup(dhp->pub_key); 1140 dh->priv_key=BN_dup(dhp->priv_key); 1141 if ((dh->pub_key == NULL) || 1142 (dh->priv_key == NULL)) 1143 { 1144 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 1145 goto err; 1146 } 1147 } 1148 r[0]=dh->p; 1149 r[1]=dh->g; 1150 r[2]=dh->pub_key; 1151 } 1152 else 1153#endif 1154 { 1155 al=SSL_AD_HANDSHAKE_FAILURE; 1156 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1157 goto f_err; 1158 } 1159 for (i=0; r[i] != NULL; i++) 1160 { 1161 nr[i]=BN_num_bytes(r[i]); 1162 n+=2+nr[i]; 1163 } 1164 1165 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) 1166 { 1167 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher)) 1168 == NULL) 1169 { 1170 al=SSL_AD_DECODE_ERROR; 1171 goto f_err; 1172 } 1173 kn=EVP_PKEY_size(pkey); 1174 } 1175 else 1176 { 1177 pkey=NULL; 1178 kn=0; 1179 } 1180 1181 if (!BUF_MEM_grow_clean(buf,n+4+kn)) 1182 { 1183 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF); 1184 goto err; 1185 } 1186 d=(unsigned char *)s->init_buf->data; 1187 p= &(d[4]); 1188 1189 for (i=0; r[i] != NULL; i++) 1190 { 1191 s2n(nr[i],p); 1192 BN_bn2bin(r[i],p); 1193 p+=nr[i]; 1194 } 1195 1196 /* not anonymous */ 1197 if (pkey != NULL) 1198 { 1199 /* n is the length of the params, they start at &(d[4]) 1200 * and p points to the space at the end. */ 1201#ifndef OPENSSL_NO_RSA 1202 if (pkey->type == EVP_PKEY_RSA) 1203 { 1204 q=md_buf; 1205 j=0; 1206 for (num=2; num > 0; num--) 1207 { 1208 EVP_DigestInit_ex(&md_ctx,(num == 2) 1209 ?s->ctx->md5:s->ctx->sha1, NULL); 1210 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1211 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1212 EVP_DigestUpdate(&md_ctx,&(d[4]),n); 1213 EVP_DigestFinal_ex(&md_ctx,q, 1214 (unsigned int *)&i); 1215 q+=i; 1216 j+=i; 1217 } 1218 if (RSA_sign(NID_md5_sha1, md_buf, j, 1219 &(p[2]), &u, pkey->pkey.rsa) <= 0) 1220 { 1221 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA); 1222 goto err; 1223 } 1224 s2n(u,p); 1225 n+=u+2; 1226 } 1227 else 1228#endif 1229#if !defined(OPENSSL_NO_DSA) 1230 if (pkey->type == EVP_PKEY_DSA) 1231 { 1232 /* lets do DSS */ 1233 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL); 1234 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1235 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1236 EVP_SignUpdate(&md_ctx,&(d[4]),n); 1237 if (!EVP_SignFinal(&md_ctx,&(p[2]), 1238 (unsigned int *)&i,pkey)) 1239 { 1240 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA); 1241 goto err; 1242 } 1243 s2n(i,p); 1244 n+=i+2; 1245 } 1246 else 1247#endif 1248 { 1249 /* Is this error check actually needed? */ 1250 al=SSL_AD_HANDSHAKE_FAILURE; 1251 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE); 1252 goto f_err; 1253 } 1254 } 1255 1256 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE; 1257 l2n3(n,d); 1258 1259 /* we should now have things packed up, so lets send 1260 * it off */ 1261 s->init_num=n+4; 1262 s->init_off=0; 1263 } 1264 1265 s->state = SSL3_ST_SW_KEY_EXCH_B; 1266 EVP_MD_CTX_cleanup(&md_ctx); 1267 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); 1268f_err: 1269 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1270err: 1271 EVP_MD_CTX_cleanup(&md_ctx); 1272 return(-1); 1273 } 1274 1275static int ssl3_send_certificate_request(SSL *s) 1276 { 1277 unsigned char *p,*d; 1278 int i,j,nl,off,n; 1279 STACK_OF(X509_NAME) *sk=NULL; 1280 X509_NAME *name; 1281 BUF_MEM *buf; 1282 1283 if (s->state == SSL3_ST_SW_CERT_REQ_A) 1284 { 1285 buf=s->init_buf; 1286 1287 d=p=(unsigned char *)&(buf->data[4]); 1288 1289 /* get the list of acceptable cert types */ 1290 p++; 1291 n=ssl3_get_req_cert_type(s,p); 1292 d[0]=n; 1293 p+=n; 1294 n++; 1295 1296 off=n; 1297 p+=2; 1298 n+=2; 1299 1300 sk=SSL_get_client_CA_list(s); 1301 nl=0; 1302 if (sk != NULL) 1303 { 1304 for (i=0; i<sk_X509_NAME_num(sk); i++) 1305 { 1306 name=sk_X509_NAME_value(sk,i); 1307 j=i2d_X509_NAME(name,NULL); 1308 if (!BUF_MEM_grow_clean(buf,4+n+j+2)) 1309 { 1310 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB); 1311 goto err; 1312 } 1313 p=(unsigned char *)&(buf->data[4+n]); 1314 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) 1315 { 1316 s2n(j,p); 1317 i2d_X509_NAME(name,&p); 1318 n+=2+j; 1319 nl+=2+j; 1320 } 1321 else 1322 { 1323 d=p; 1324 i2d_X509_NAME(name,&p); 1325 j-=2; s2n(j,d); j+=2; 1326 n+=j; 1327 nl+=j; 1328 } 1329 } 1330 } 1331 /* else no CA names */ 1332 p=(unsigned char *)&(buf->data[4+off]); 1333 s2n(nl,p); 1334 1335 d=(unsigned char *)buf->data; 1336 *(d++)=SSL3_MT_CERTIFICATE_REQUEST; 1337 l2n3(n,d); 1338 1339 /* we should now have things packed up, so lets send 1340 * it off */ 1341 1342 s->init_num=n+4; 1343 s->init_off=0; 1344#ifdef NETSCAPE_HANG_BUG 1345 p=(unsigned char *)s->init_buf->data + s->init_num; 1346 1347 /* do the header */ 1348 *(p++)=SSL3_MT_SERVER_DONE; 1349 *(p++)=0; 1350 *(p++)=0; 1351 *(p++)=0; 1352 s->init_num += 4; 1353#endif 1354 1355 } 1356 1357 /* SSL3_ST_SW_CERT_REQ_B */ 1358 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); 1359err: 1360 return(-1); 1361 } 1362 1363static int ssl3_get_client_key_exchange(SSL *s) 1364 { 1365 int i,al,ok; 1366 long n; 1367 unsigned long l; 1368 unsigned char *p; 1369#ifndef OPENSSL_NO_RSA 1370 RSA *rsa=NULL; 1371 EVP_PKEY *pkey=NULL; 1372#endif 1373#ifndef OPENSSL_NO_DH 1374 BIGNUM *pub=NULL; 1375 DH *dh_srvr; 1376#endif 1377#ifndef OPENSSL_NO_KRB5 1378 KSSL_ERR kssl_err; 1379#endif /* OPENSSL_NO_KRB5 */ 1380 1381 n=ssl3_get_message(s, 1382 SSL3_ST_SR_KEY_EXCH_A, 1383 SSL3_ST_SR_KEY_EXCH_B, 1384 SSL3_MT_CLIENT_KEY_EXCHANGE, 1385 2048, /* ??? */ 1386 &ok); 1387 1388 if (!ok) return((int)n); 1389 p=(unsigned char *)s->init_msg; 1390 1391 l=s->s3->tmp.new_cipher->algorithms; 1392 1393#ifndef OPENSSL_NO_RSA 1394 if (l & SSL_kRSA) 1395 { 1396 /* FIX THIS UP EAY EAY EAY EAY */ 1397 if (s->s3->tmp.use_rsa_tmp) 1398 { 1399 if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL)) 1400 rsa=s->cert->rsa_tmp; 1401 /* Don't do a callback because rsa_tmp should 1402 * be sent already */ 1403 if (rsa == NULL) 1404 { 1405 al=SSL_AD_HANDSHAKE_FAILURE; 1406 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY); 1407 goto f_err; 1408 1409 } 1410 } 1411 else 1412 { 1413 pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey; 1414 if ( (pkey == NULL) || 1415 (pkey->type != EVP_PKEY_RSA) || 1416 (pkey->pkey.rsa == NULL)) 1417 { 1418 al=SSL_AD_HANDSHAKE_FAILURE; 1419 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE); 1420 goto f_err; 1421 } 1422 rsa=pkey->pkey.rsa; 1423 } 1424 1425 /* TLS */ 1426 if (s->version > SSL3_VERSION) 1427 { 1428 n2s(p,i); 1429 if (n != i+2) 1430 { 1431 if (!(s->options & SSL_OP_TLS_D5_BUG)) 1432 { 1433 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG); 1434 goto err; 1435 } 1436 else 1437 p-=2; 1438 } 1439 else 1440 n=i; 1441 } 1442 1443 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING); 1444 1445 al = -1; 1446 1447 if (i != SSL_MAX_MASTER_KEY_LENGTH) 1448 { 1449 al=SSL_AD_DECODE_ERROR; 1450 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); 1451 } 1452 1453 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff)))) 1454 { 1455 /* The premaster secret must contain the same version number as the 1456 * ClientHello to detect version rollback attacks (strangely, the 1457 * protocol does not offer such protection for DH ciphersuites). 1458 * However, buggy clients exist that send the negotiated protocol 1459 * version instead if the server does not support the requested 1460 * protocol version. 1461 * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */ 1462 if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) && 1463 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff)))) 1464 { 1465 al=SSL_AD_DECODE_ERROR; 1466 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); 1467 goto f_err; 1468 } 1469 } 1470 1471 if (al != -1) 1472 { 1473#if 0 1474 goto f_err; 1475#else 1476 /* Some decryption failure -- use random value instead as countermeasure 1477 * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding 1478 * (see RFC 2246, section 7.4.7.1). 1479 * But note that due to length and protocol version checking, the 1480 * attack is impractical anyway (see section 5 in D. Bleichenbacher: 1481 * "Chosen Ciphertext Attacks Against Protocols Based on the RSA 1482 * Encryption Standard PKCS #1", CRYPTO '98, LNCS 1462, pp. 1-12). 1483 */ 1484 ERR_clear_error(); 1485 i = SSL_MAX_MASTER_KEY_LENGTH; 1486 p[0] = s->client_version >> 8; 1487 p[1] = s->client_version & 0xff; 1488 RAND_pseudo_bytes(p+2, i-2); /* should be RAND_bytes, but we cannot work around a failure */ 1489#endif 1490 } 1491 1492 s->session->master_key_length= 1493 s->method->ssl3_enc->generate_master_secret(s, 1494 s->session->master_key, 1495 p,i); 1496 OPENSSL_cleanse(p,i); 1497 } 1498 else 1499#endif 1500#ifndef OPENSSL_NO_DH 1501 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 1502 { 1503 n2s(p,i); 1504 if (n != i+2) 1505 { 1506 if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG)) 1507 { 1508 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); 1509 goto err; 1510 } 1511 else 1512 { 1513 p-=2; 1514 i=(int)n; 1515 } 1516 } 1517 1518 if (n == 0L) /* the parameters are in the cert */ 1519 { 1520 al=SSL_AD_HANDSHAKE_FAILURE; 1521 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS); 1522 goto f_err; 1523 } 1524 else 1525 { 1526 if (s->s3->tmp.dh == NULL) 1527 { 1528 al=SSL_AD_HANDSHAKE_FAILURE; 1529 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY); 1530 goto f_err; 1531 } 1532 else 1533 dh_srvr=s->s3->tmp.dh; 1534 } 1535 1536 pub=BN_bin2bn(p,i,NULL); 1537 if (pub == NULL) 1538 { 1539 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB); 1540 goto err; 1541 } 1542 1543 i=DH_compute_key(p,pub,dh_srvr); 1544 1545 if (i <= 0) 1546 { 1547 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1548 goto err; 1549 } 1550 1551 DH_free(s->s3->tmp.dh); 1552 s->s3->tmp.dh=NULL; 1553 1554 BN_clear_free(pub); 1555 pub=NULL; 1556 s->session->master_key_length= 1557 s->method->ssl3_enc->generate_master_secret(s, 1558 s->session->master_key,p,i); 1559 OPENSSL_cleanse(p,i); 1560 } 1561 else 1562#endif 1563#ifndef OPENSSL_NO_KRB5 1564 if (l & SSL_kKRB5) 1565 { 1566 krb5_error_code krb5rc; 1567 krb5_data enc_ticket; 1568 krb5_data authenticator; 1569 krb5_data enc_pms; 1570 KSSL_CTX *kssl_ctx = s->kssl_ctx; 1571 EVP_CIPHER_CTX ciph_ctx; 1572 EVP_CIPHER *enc = NULL; 1573 unsigned char iv[EVP_MAX_IV_LENGTH]; 1574 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH 1575 + EVP_MAX_BLOCK_LENGTH]; 1576 int padl, outl; 1577 krb5_timestamp authtime = 0; 1578 krb5_ticket_times ttimes; 1579 1580 EVP_CIPHER_CTX_init(&ciph_ctx); 1581 1582 if (!kssl_ctx) kssl_ctx = kssl_ctx_new(); 1583 1584 n2s(p,i); 1585 enc_ticket.length = i; 1586 enc_ticket.data = (char *)p; 1587 p+=enc_ticket.length; 1588 1589 n2s(p,i); 1590 authenticator.length = i; 1591 authenticator.data = (char *)p; 1592 p+=authenticator.length; 1593 1594 n2s(p,i); 1595 enc_pms.length = i; 1596 enc_pms.data = (char *)p; 1597 p+=enc_pms.length; 1598 1599 /* Note that the length is checked again below, 1600 ** after decryption 1601 */ 1602 if(enc_pms.length > sizeof pms) 1603 { 1604 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 1605 SSL_R_DATA_LENGTH_TOO_LONG); 1606 goto err; 1607 } 1608 1609 if (n != enc_ticket.length + authenticator.length + 1610 enc_pms.length + 6) 1611 { 1612 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 1613 SSL_R_DATA_LENGTH_TOO_LONG); 1614 goto err; 1615 } 1616 1617 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes, 1618 &kssl_err)) != 0) 1619 { 1620#ifdef KSSL_DEBUG 1621 printf("kssl_sget_tkt rtn %d [%d]\n", 1622 krb5rc, kssl_err.reason); 1623 if (kssl_err.text) 1624 printf("kssl_err text= %s\n", kssl_err.text); 1625#endif /* KSSL_DEBUG */ 1626 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 1627 kssl_err.reason); 1628 goto err; 1629 } 1630 1631 /* Note: no authenticator is not considered an error, 1632 ** but will return authtime == 0. 1633 */ 1634 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator, 1635 &authtime, &kssl_err)) != 0) 1636 { 1637#ifdef KSSL_DEBUG 1638 printf("kssl_check_authent rtn %d [%d]\n", 1639 krb5rc, kssl_err.reason); 1640 if (kssl_err.text) 1641 printf("kssl_err text= %s\n", kssl_err.text); 1642#endif /* KSSL_DEBUG */ 1643 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 1644 kssl_err.reason); 1645 goto err; 1646 } 1647 1648 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0) 1649 { 1650 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, krb5rc); 1651 goto err; 1652 } 1653 1654#ifdef KSSL_DEBUG 1655 kssl_ctx_show(kssl_ctx); 1656#endif /* KSSL_DEBUG */ 1657 1658 enc = kssl_map_enc(kssl_ctx->enctype); 1659 if (enc == NULL) 1660 goto err; 1661 1662 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 1663 1664 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv)) 1665 { 1666 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 1667 SSL_R_DECRYPTION_FAILED); 1668 goto err; 1669 } 1670 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl, 1671 (unsigned char *)enc_pms.data, enc_pms.length)) 1672 { 1673 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 1674 SSL_R_DECRYPTION_FAILED); 1675 goto err; 1676 } 1677 if (outl > SSL_MAX_MASTER_KEY_LENGTH) 1678 { 1679 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 1680 SSL_R_DATA_LENGTH_TOO_LONG); 1681 goto err; 1682 } 1683 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl)) 1684 { 1685 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 1686 SSL_R_DECRYPTION_FAILED); 1687 goto err; 1688 } 1689 outl += padl; 1690 if (outl > SSL_MAX_MASTER_KEY_LENGTH) 1691 { 1692 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 1693 SSL_R_DATA_LENGTH_TOO_LONG); 1694 goto err; 1695 } 1696 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 1697 1698 s->session->master_key_length= 1699 s->method->ssl3_enc->generate_master_secret(s, 1700 s->session->master_key, pms, outl); 1701 1702 if (kssl_ctx->client_princ) 1703 { 1704 int len = strlen(kssl_ctx->client_princ); 1705 if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 1706 { 1707 s->session->krb5_client_princ_len = len; 1708 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len); 1709 } 1710 } 1711 1712 1713 /* Was doing kssl_ctx_free() here, 1714 ** but it caused problems for apache. 1715 ** kssl_ctx = kssl_ctx_free(kssl_ctx); 1716 ** if (s->kssl_ctx) s->kssl_ctx = NULL; 1717 */ 1718 } 1719 else 1720#endif /* OPENSSL_NO_KRB5 */ 1721 { 1722 al=SSL_AD_HANDSHAKE_FAILURE; 1723 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 1724 SSL_R_UNKNOWN_CIPHER_TYPE); 1725 goto f_err; 1726 } 1727 1728 return(1); 1729f_err: 1730 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1731#if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) 1732err: 1733#endif 1734 return(-1); 1735 } 1736 1737static int ssl3_get_cert_verify(SSL *s) 1738 { 1739 EVP_PKEY *pkey=NULL; 1740 unsigned char *p; 1741 int al,ok,ret=0; 1742 long n; 1743 int type=0,i,j; 1744 X509 *peer; 1745 1746 n=ssl3_get_message(s, 1747 SSL3_ST_SR_CERT_VRFY_A, 1748 SSL3_ST_SR_CERT_VRFY_B, 1749 -1, 1750 514, /* 514? */ 1751 &ok); 1752 1753 if (!ok) return((int)n); 1754 1755 if (s->session->peer != NULL) 1756 { 1757 peer=s->session->peer; 1758 pkey=X509_get_pubkey(peer); 1759 type=X509_certificate_type(peer,pkey); 1760 } 1761 else 1762 { 1763 peer=NULL; 1764 pkey=NULL; 1765 } 1766 1767 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY) 1768 { 1769 s->s3->tmp.reuse_message=1; 1770 if ((peer != NULL) && (type | EVP_PKT_SIGN)) 1771 { 1772 al=SSL_AD_UNEXPECTED_MESSAGE; 1773 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE); 1774 goto f_err; 1775 } 1776 ret=1; 1777 goto end; 1778 } 1779 1780 if (peer == NULL) 1781 { 1782 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED); 1783 al=SSL_AD_UNEXPECTED_MESSAGE; 1784 goto f_err; 1785 } 1786 1787 if (!(type & EVP_PKT_SIGN)) 1788 { 1789 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); 1790 al=SSL_AD_ILLEGAL_PARAMETER; 1791 goto f_err; 1792 } 1793 1794 if (s->s3->change_cipher_spec) 1795 { 1796 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY); 1797 al=SSL_AD_UNEXPECTED_MESSAGE; 1798 goto f_err; 1799 } 1800 1801 /* we now have a signature that we need to verify */ 1802 p=(unsigned char *)s->init_msg; 1803 n2s(p,i); 1804 n-=2; 1805 if (i > n) 1806 { 1807 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH); 1808 al=SSL_AD_DECODE_ERROR; 1809 goto f_err; 1810 } 1811 1812 j=EVP_PKEY_size(pkey); 1813 if ((i > j) || (n > j) || (n <= 0)) 1814 { 1815 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE); 1816 al=SSL_AD_DECODE_ERROR; 1817 goto f_err; 1818 } 1819 1820#ifndef OPENSSL_NO_RSA 1821 if (pkey->type == EVP_PKEY_RSA) 1822 { 1823 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md, 1824 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 1825 pkey->pkey.rsa); 1826 if (i < 0) 1827 { 1828 al=SSL_AD_DECRYPT_ERROR; 1829 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT); 1830 goto f_err; 1831 } 1832 if (i == 0) 1833 { 1834 al=SSL_AD_DECRYPT_ERROR; 1835 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE); 1836 goto f_err; 1837 } 1838 } 1839 else 1840#endif 1841#ifndef OPENSSL_NO_DSA 1842 if (pkey->type == EVP_PKEY_DSA) 1843 { 1844 j=DSA_verify(pkey->save_type, 1845 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]), 1846 SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa); 1847 if (j <= 0) 1848 { 1849 /* bad signature */ 1850 al=SSL_AD_DECRYPT_ERROR; 1851 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE); 1852 goto f_err; 1853 } 1854 } 1855 else 1856#endif 1857 { 1858 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR); 1859 al=SSL_AD_UNSUPPORTED_CERTIFICATE; 1860 goto f_err; 1861 } 1862 1863 1864 ret=1; 1865 if (0) 1866 { 1867f_err: 1868 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1869 } 1870end: 1871 EVP_PKEY_free(pkey); 1872 return(ret); 1873 } 1874 1875static int ssl3_get_client_certificate(SSL *s) 1876 { 1877 int i,ok,al,ret= -1; 1878 X509 *x=NULL; 1879 unsigned long l,nc,llen,n; 1880 unsigned char *p,*d,*q; 1881 STACK_OF(X509) *sk=NULL; 1882 1883 n=ssl3_get_message(s, 1884 SSL3_ST_SR_CERT_A, 1885 SSL3_ST_SR_CERT_B, 1886 -1, 1887 s->max_cert_list, 1888 &ok); 1889 1890 if (!ok) return((int)n); 1891 1892 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) 1893 { 1894 if ( (s->verify_mode & SSL_VERIFY_PEER) && 1895 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) 1896 { 1897 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 1898 al=SSL_AD_HANDSHAKE_FAILURE; 1899 goto f_err; 1900 } 1901 /* If tls asked for a client cert, the client must return a 0 list */ 1902 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request) 1903 { 1904 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST); 1905 al=SSL_AD_UNEXPECTED_MESSAGE; 1906 goto f_err; 1907 } 1908 s->s3->tmp.reuse_message=1; 1909 return(1); 1910 } 1911 1912 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE) 1913 { 1914 al=SSL_AD_UNEXPECTED_MESSAGE; 1915 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE); 1916 goto f_err; 1917 } 1918 d=p=(unsigned char *)s->init_msg; 1919 1920 if ((sk=sk_X509_new_null()) == NULL) 1921 { 1922 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE); 1923 goto err; 1924 } 1925 1926 n2l3(p,llen); 1927 if (llen+3 != n) 1928 { 1929 al=SSL_AD_DECODE_ERROR; 1930 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH); 1931 goto f_err; 1932 } 1933 for (nc=0; nc<llen; ) 1934 { 1935 n2l3(p,l); 1936 if ((l+nc+3) > llen) 1937 { 1938 al=SSL_AD_DECODE_ERROR; 1939 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH); 1940 goto f_err; 1941 } 1942 1943 q=p; 1944 x=d2i_X509(NULL,&p,l); 1945 if (x == NULL) 1946 { 1947 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB); 1948 goto err; 1949 } 1950 if (p != (q+l)) 1951 { 1952 al=SSL_AD_DECODE_ERROR; 1953 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH); 1954 goto f_err; 1955 } 1956 if (!sk_X509_push(sk,x)) 1957 { 1958 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE); 1959 goto err; 1960 } 1961 x=NULL; 1962 nc+=l+3; 1963 } 1964 1965 if (sk_X509_num(sk) <= 0) 1966 { 1967 /* TLS does not mind 0 certs returned */ 1968 if (s->version == SSL3_VERSION) 1969 { 1970 al=SSL_AD_HANDSHAKE_FAILURE; 1971 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED); 1972 goto f_err; 1973 } 1974 /* Fail for TLS only if we required a certificate */ 1975 else if ((s->verify_mode & SSL_VERIFY_PEER) && 1976 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) 1977 { 1978 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 1979 al=SSL_AD_HANDSHAKE_FAILURE; 1980 goto f_err; 1981 } 1982 } 1983 else 1984 { 1985 i=ssl_verify_cert_chain(s,sk); 1986 if (!i) 1987 { 1988 al=ssl_verify_alarm_type(s->verify_result); 1989 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED); 1990 goto f_err; 1991 } 1992 } 1993 1994 if (s->session->peer != NULL) /* This should not be needed */ 1995 X509_free(s->session->peer); 1996 s->session->peer=sk_X509_shift(sk); 1997 s->session->verify_result = s->verify_result; 1998 1999 /* With the current implementation, sess_cert will always be NULL 2000 * when we arrive here. */ 2001 if (s->session->sess_cert == NULL) 2002 { 2003 s->session->sess_cert = ssl_sess_cert_new(); 2004 if (s->session->sess_cert == NULL) 2005 { 2006 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); 2007 goto err; 2008 } 2009 } 2010 if (s->session->sess_cert->cert_chain != NULL) 2011 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free); 2012 s->session->sess_cert->cert_chain=sk; 2013 /* Inconsistency alert: cert_chain does *not* include the 2014 * peer's own certificate, while we do include it in s3_clnt.c */ 2015 2016 sk=NULL; 2017 2018 ret=1; 2019 if (0) 2020 { 2021f_err: 2022 ssl3_send_alert(s,SSL3_AL_FATAL,al); 2023 } 2024err: 2025 if (x != NULL) X509_free(x); 2026 if (sk != NULL) sk_X509_pop_free(sk,X509_free); 2027 return(ret); 2028 } 2029 2030int ssl3_send_server_certificate(SSL *s) 2031 { 2032 unsigned long l; 2033 X509 *x; 2034 2035 if (s->state == SSL3_ST_SW_CERT_A) 2036 { 2037 x=ssl_get_server_send_cert(s); 2038 if (x == NULL && 2039 /* VRS: allow null cert if auth == KRB5 */ 2040 (s->s3->tmp.new_cipher->algorithms 2041 & (SSL_MKEY_MASK|SSL_AUTH_MASK)) 2042 != (SSL_aKRB5|SSL_kKRB5)) 2043 { 2044 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR); 2045 return(0); 2046 } 2047 2048 l=ssl3_output_cert_chain(s,x); 2049 s->state=SSL3_ST_SW_CERT_B; 2050 s->init_num=(int)l; 2051 s->init_off=0; 2052 } 2053 2054 /* SSL3_ST_SW_CERT_B */ 2055 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); 2056 } 2057