s3_srvr.c revision 112439
1/* ssl/s3_srvr.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) 1998-2002 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#define REUSE_CIPHER_BUG 113#define NETSCAPE_HANG_BUG 114 115 116#include <stdio.h> 117#include "ssl_locl.h" 118#include "kssl_lcl.h" 119#include <openssl/buffer.h> 120#include <openssl/rand.h> 121#include <openssl/objects.h> 122#include <openssl/evp.h> 123#include <openssl/x509.h> 124#include <openssl/krb5_asn.h> 125#include <openssl/md5.h> 126#include "cryptlib.h" 127 128static SSL_METHOD *ssl3_get_server_method(int ver); 129static int ssl3_get_client_hello(SSL *s); 130static int ssl3_check_client_hello(SSL *s); 131static int ssl3_send_server_hello(SSL *s); 132static int ssl3_send_server_key_exchange(SSL *s); 133static int ssl3_send_certificate_request(SSL *s); 134static int ssl3_send_server_done(SSL *s); 135static int ssl3_get_client_key_exchange(SSL *s); 136static int ssl3_get_client_certificate(SSL *s); 137static int ssl3_get_cert_verify(SSL *s); 138static int ssl3_send_hello_request(SSL *s); 139 140static SSL_METHOD *ssl3_get_server_method(int ver) 141 { 142 if (ver == SSL3_VERSION) 143 return(SSLv3_server_method()); 144 else 145 return(NULL); 146 } 147 148SSL_METHOD *SSLv3_server_method(void) 149 { 150 static int init=1; 151 static SSL_METHOD SSLv3_server_data; 152 153 if (init) 154 { 155 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD); 156 157 if (init) 158 { 159 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(), 160 sizeof(SSL_METHOD)); 161 SSLv3_server_data.ssl_accept=ssl3_accept; 162 SSLv3_server_data.get_ssl_method=ssl3_get_server_method; 163 init=0; 164 } 165 166 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD); 167 } 168 return(&SSLv3_server_data); 169 } 170 171int ssl3_accept(SSL *s) 172 { 173 BUF_MEM *buf; 174 unsigned long l,Time=time(NULL); 175 void (*cb)(const SSL *ssl,int type,int val)=NULL; 176 long num1; 177 int ret= -1; 178 int new_state,state,skip=0; 179 180 RAND_add(&Time,sizeof(Time),0); 181 ERR_clear_error(); 182 clear_sys_error(); 183 184 if (s->info_callback != NULL) 185 cb=s->info_callback; 186 else if (s->ctx->info_callback != NULL) 187 cb=s->ctx->info_callback; 188 189 /* init things to blank */ 190 s->in_handshake++; 191 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 192 193 if (s->cert == NULL) 194 { 195 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET); 196 return(-1); 197 } 198 199 for (;;) 200 { 201 state=s->state; 202 203 switch (s->state) 204 { 205 case SSL_ST_RENEGOTIATE: 206 s->new_session=1; 207 /* s->state=SSL_ST_ACCEPT; */ 208 209 case SSL_ST_BEFORE: 210 case SSL_ST_ACCEPT: 211 case SSL_ST_BEFORE|SSL_ST_ACCEPT: 212 case SSL_ST_OK|SSL_ST_ACCEPT: 213 214 s->server=1; 215 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 216 217 if ((s->version>>8) != 3) 218 { 219 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR); 220 return -1; 221 } 222 s->type=SSL_ST_ACCEPT; 223 224 if (s->init_buf == NULL) 225 { 226 if ((buf=BUF_MEM_new()) == NULL) 227 { 228 ret= -1; 229 goto end; 230 } 231 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 232 { 233 ret= -1; 234 goto end; 235 } 236 s->init_buf=buf; 237 } 238 239 if (!ssl3_setup_buffers(s)) 240 { 241 ret= -1; 242 goto end; 243 } 244 245 s->init_num=0; 246 247 if (s->state != SSL_ST_RENEGOTIATE) 248 { 249 /* Ok, we now need to push on a buffering BIO so that 250 * the output is sent in a way that TCP likes :-) 251 */ 252 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; } 253 254 ssl3_init_finished_mac(s); 255 s->state=SSL3_ST_SR_CLNT_HELLO_A; 256 s->ctx->stats.sess_accept++; 257 } 258 else 259 { 260 /* s->state == SSL_ST_RENEGOTIATE, 261 * we will just send a HelloRequest */ 262 s->ctx->stats.sess_accept_renegotiate++; 263 s->state=SSL3_ST_SW_HELLO_REQ_A; 264 } 265 break; 266 267 case SSL3_ST_SW_HELLO_REQ_A: 268 case SSL3_ST_SW_HELLO_REQ_B: 269 270 s->shutdown=0; 271 ret=ssl3_send_hello_request(s); 272 if (ret <= 0) goto end; 273 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C; 274 s->state=SSL3_ST_SW_FLUSH; 275 s->init_num=0; 276 277 ssl3_init_finished_mac(s); 278 break; 279 280 case SSL3_ST_SW_HELLO_REQ_C: 281 s->state=SSL_ST_OK; 282 break; 283 284 case SSL3_ST_SR_CLNT_HELLO_A: 285 case SSL3_ST_SR_CLNT_HELLO_B: 286 case SSL3_ST_SR_CLNT_HELLO_C: 287 288 s->shutdown=0; 289 ret=ssl3_get_client_hello(s); 290 if (ret <= 0) goto end; 291 s->new_session = 2; 292 s->state=SSL3_ST_SW_SRVR_HELLO_A; 293 s->init_num=0; 294 break; 295 296 case SSL3_ST_SW_SRVR_HELLO_A: 297 case SSL3_ST_SW_SRVR_HELLO_B: 298 ret=ssl3_send_server_hello(s); 299 if (ret <= 0) goto end; 300 301 if (s->hit) 302 s->state=SSL3_ST_SW_CHANGE_A; 303 else 304 s->state=SSL3_ST_SW_CERT_A; 305 s->init_num=0; 306 break; 307 308 case SSL3_ST_SW_CERT_A: 309 case SSL3_ST_SW_CERT_B: 310 /* Check if it is anon DH */ 311 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) 312 { 313 ret=ssl3_send_server_certificate(s); 314 if (ret <= 0) goto end; 315 } 316 else 317 skip=1; 318 s->state=SSL3_ST_SW_KEY_EXCH_A; 319 s->init_num=0; 320 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 1468 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack 1469 * (http://eprint.iacr.org/2003/052/) exploits the version 1470 * number check as a "bad version oracle" -- an alert would 1471 * reveal that the plaintext corresponding to some ciphertext 1472 * made up by the adversary is properly formatted except 1473 * that the version number is wrong. To avoid such attacks, 1474 * we should treat this just like any other decryption error. */ 1475 p[0] = (char)(int) "CAN-2003-0131 patch 2003-03-19"; 1476 } 1477 } 1478 1479 if (al != -1) 1480 { 1481 /* Some decryption failure -- use random value instead as countermeasure 1482 * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding 1483 * (see RFC 2246, section 7.4.7.1). */ 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 } 1490 1491 s->session->master_key_length= 1492 s->method->ssl3_enc->generate_master_secret(s, 1493 s->session->master_key, 1494 p,i); 1495 OPENSSL_cleanse(p,i); 1496 } 1497 else 1498#endif 1499#ifndef OPENSSL_NO_DH 1500 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 1501 { 1502 n2s(p,i); 1503 if (n != i+2) 1504 { 1505 if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG)) 1506 { 1507 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); 1508 goto err; 1509 } 1510 else 1511 { 1512 p-=2; 1513 i=(int)n; 1514 } 1515 } 1516 1517 if (n == 0L) /* the parameters are in the cert */ 1518 { 1519 al=SSL_AD_HANDSHAKE_FAILURE; 1520 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS); 1521 goto f_err; 1522 } 1523 else 1524 { 1525 if (s->s3->tmp.dh == NULL) 1526 { 1527 al=SSL_AD_HANDSHAKE_FAILURE; 1528 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY); 1529 goto f_err; 1530 } 1531 else 1532 dh_srvr=s->s3->tmp.dh; 1533 } 1534 1535 pub=BN_bin2bn(p,i,NULL); 1536 if (pub == NULL) 1537 { 1538 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB); 1539 goto err; 1540 } 1541 1542 i=DH_compute_key(p,pub,dh_srvr); 1543 1544 if (i <= 0) 1545 { 1546 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1547 goto err; 1548 } 1549 1550 DH_free(s->s3->tmp.dh); 1551 s->s3->tmp.dh=NULL; 1552 1553 BN_clear_free(pub); 1554 pub=NULL; 1555 s->session->master_key_length= 1556 s->method->ssl3_enc->generate_master_secret(s, 1557 s->session->master_key,p,i); 1558 OPENSSL_cleanse(p,i); 1559 } 1560 else 1561#endif 1562#ifndef OPENSSL_NO_KRB5 1563 if (l & SSL_kKRB5) 1564 { 1565 krb5_error_code krb5rc; 1566 krb5_data enc_ticket; 1567 krb5_data authenticator; 1568 krb5_data enc_pms; 1569 KSSL_CTX *kssl_ctx = s->kssl_ctx; 1570 EVP_CIPHER_CTX ciph_ctx; 1571 EVP_CIPHER *enc = NULL; 1572 unsigned char iv[EVP_MAX_IV_LENGTH]; 1573 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH 1574 + EVP_MAX_BLOCK_LENGTH]; 1575 int padl, outl; 1576 krb5_timestamp authtime = 0; 1577 krb5_ticket_times ttimes; 1578 1579 EVP_CIPHER_CTX_init(&ciph_ctx); 1580 1581 if (!kssl_ctx) kssl_ctx = kssl_ctx_new(); 1582 1583 n2s(p,i); 1584 enc_ticket.length = i; 1585 enc_ticket.data = (char *)p; 1586 p+=enc_ticket.length; 1587 1588 n2s(p,i); 1589 authenticator.length = i; 1590 authenticator.data = (char *)p; 1591 p+=authenticator.length; 1592 1593 n2s(p,i); 1594 enc_pms.length = i; 1595 enc_pms.data = (char *)p; 1596 p+=enc_pms.length; 1597 1598 /* Note that the length is checked again below, 1599 ** after decryption 1600 */ 1601 if(enc_pms.length > sizeof pms) 1602 { 1603 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 1604 SSL_R_DATA_LENGTH_TOO_LONG); 1605 goto err; 1606 } 1607 1608 if (n != enc_ticket.length + authenticator.length + 1609 enc_pms.length + 6) 1610 { 1611 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 1612 SSL_R_DATA_LENGTH_TOO_LONG); 1613 goto err; 1614 } 1615 1616 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes, 1617 &kssl_err)) != 0) 1618 { 1619#ifdef KSSL_DEBUG 1620 printf("kssl_sget_tkt rtn %d [%d]\n", 1621 krb5rc, kssl_err.reason); 1622 if (kssl_err.text) 1623 printf("kssl_err text= %s\n", kssl_err.text); 1624#endif /* KSSL_DEBUG */ 1625 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 1626 kssl_err.reason); 1627 goto err; 1628 } 1629 1630 /* Note: no authenticator is not considered an error, 1631 ** but will return authtime == 0. 1632 */ 1633 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator, 1634 &authtime, &kssl_err)) != 0) 1635 { 1636#ifdef KSSL_DEBUG 1637 printf("kssl_check_authent rtn %d [%d]\n", 1638 krb5rc, kssl_err.reason); 1639 if (kssl_err.text) 1640 printf("kssl_err text= %s\n", kssl_err.text); 1641#endif /* KSSL_DEBUG */ 1642 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 1643 kssl_err.reason); 1644 goto err; 1645 } 1646 1647 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0) 1648 { 1649 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, krb5rc); 1650 goto err; 1651 } 1652 1653#ifdef KSSL_DEBUG 1654 kssl_ctx_show(kssl_ctx); 1655#endif /* KSSL_DEBUG */ 1656 1657 enc = kssl_map_enc(kssl_ctx->enctype); 1658 if (enc == NULL) 1659 goto err; 1660 1661 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 1662 1663 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv)) 1664 { 1665 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 1666 SSL_R_DECRYPTION_FAILED); 1667 goto err; 1668 } 1669 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl, 1670 (unsigned char *)enc_pms.data, enc_pms.length)) 1671 { 1672 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 1673 SSL_R_DECRYPTION_FAILED); 1674 goto err; 1675 } 1676 if (outl > SSL_MAX_MASTER_KEY_LENGTH) 1677 { 1678 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 1679 SSL_R_DATA_LENGTH_TOO_LONG); 1680 goto err; 1681 } 1682 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl)) 1683 { 1684 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 1685 SSL_R_DECRYPTION_FAILED); 1686 goto err; 1687 } 1688 outl += padl; 1689 if (outl > SSL_MAX_MASTER_KEY_LENGTH) 1690 { 1691 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 1692 SSL_R_DATA_LENGTH_TOO_LONG); 1693 goto err; 1694 } 1695 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 1696 1697 s->session->master_key_length= 1698 s->method->ssl3_enc->generate_master_secret(s, 1699 s->session->master_key, pms, outl); 1700 1701 if (kssl_ctx->client_princ) 1702 { 1703 int len = strlen(kssl_ctx->client_princ); 1704 if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 1705 { 1706 s->session->krb5_client_princ_len = len; 1707 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len); 1708 } 1709 } 1710 1711 1712 /* Was doing kssl_ctx_free() here, 1713 ** but it caused problems for apache. 1714 ** kssl_ctx = kssl_ctx_free(kssl_ctx); 1715 ** if (s->kssl_ctx) s->kssl_ctx = NULL; 1716 */ 1717 } 1718 else 1719#endif /* OPENSSL_NO_KRB5 */ 1720 { 1721 al=SSL_AD_HANDSHAKE_FAILURE; 1722 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 1723 SSL_R_UNKNOWN_CIPHER_TYPE); 1724 goto f_err; 1725 } 1726 1727 return(1); 1728f_err: 1729 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1730#if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) 1731err: 1732#endif 1733 return(-1); 1734 } 1735 1736static int ssl3_get_cert_verify(SSL *s) 1737 { 1738 EVP_PKEY *pkey=NULL; 1739 unsigned char *p; 1740 int al,ok,ret=0; 1741 long n; 1742 int type=0,i,j; 1743 X509 *peer; 1744 1745 n=ssl3_get_message(s, 1746 SSL3_ST_SR_CERT_VRFY_A, 1747 SSL3_ST_SR_CERT_VRFY_B, 1748 -1, 1749 514, /* 514? */ 1750 &ok); 1751 1752 if (!ok) return((int)n); 1753 1754 if (s->session->peer != NULL) 1755 { 1756 peer=s->session->peer; 1757 pkey=X509_get_pubkey(peer); 1758 type=X509_certificate_type(peer,pkey); 1759 } 1760 else 1761 { 1762 peer=NULL; 1763 pkey=NULL; 1764 } 1765 1766 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY) 1767 { 1768 s->s3->tmp.reuse_message=1; 1769 if ((peer != NULL) && (type | EVP_PKT_SIGN)) 1770 { 1771 al=SSL_AD_UNEXPECTED_MESSAGE; 1772 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE); 1773 goto f_err; 1774 } 1775 ret=1; 1776 goto end; 1777 } 1778 1779 if (peer == NULL) 1780 { 1781 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED); 1782 al=SSL_AD_UNEXPECTED_MESSAGE; 1783 goto f_err; 1784 } 1785 1786 if (!(type & EVP_PKT_SIGN)) 1787 { 1788 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); 1789 al=SSL_AD_ILLEGAL_PARAMETER; 1790 goto f_err; 1791 } 1792 1793 if (s->s3->change_cipher_spec) 1794 { 1795 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY); 1796 al=SSL_AD_UNEXPECTED_MESSAGE; 1797 goto f_err; 1798 } 1799 1800 /* we now have a signature that we need to verify */ 1801 p=(unsigned char *)s->init_msg; 1802 n2s(p,i); 1803 n-=2; 1804 if (i > n) 1805 { 1806 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH); 1807 al=SSL_AD_DECODE_ERROR; 1808 goto f_err; 1809 } 1810 1811 j=EVP_PKEY_size(pkey); 1812 if ((i > j) || (n > j) || (n <= 0)) 1813 { 1814 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE); 1815 al=SSL_AD_DECODE_ERROR; 1816 goto f_err; 1817 } 1818 1819#ifndef OPENSSL_NO_RSA 1820 if (pkey->type == EVP_PKEY_RSA) 1821 { 1822 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md, 1823 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 1824 pkey->pkey.rsa); 1825 if (i < 0) 1826 { 1827 al=SSL_AD_DECRYPT_ERROR; 1828 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT); 1829 goto f_err; 1830 } 1831 if (i == 0) 1832 { 1833 al=SSL_AD_DECRYPT_ERROR; 1834 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE); 1835 goto f_err; 1836 } 1837 } 1838 else 1839#endif 1840#ifndef OPENSSL_NO_DSA 1841 if (pkey->type == EVP_PKEY_DSA) 1842 { 1843 j=DSA_verify(pkey->save_type, 1844 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]), 1845 SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa); 1846 if (j <= 0) 1847 { 1848 /* bad signature */ 1849 al=SSL_AD_DECRYPT_ERROR; 1850 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE); 1851 goto f_err; 1852 } 1853 } 1854 else 1855#endif 1856 { 1857 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR); 1858 al=SSL_AD_UNSUPPORTED_CERTIFICATE; 1859 goto f_err; 1860 } 1861 1862 1863 ret=1; 1864 if (0) 1865 { 1866f_err: 1867 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1868 } 1869end: 1870 EVP_PKEY_free(pkey); 1871 return(ret); 1872 } 1873 1874static int ssl3_get_client_certificate(SSL *s) 1875 { 1876 int i,ok,al,ret= -1; 1877 X509 *x=NULL; 1878 unsigned long l,nc,llen,n; 1879 unsigned char *p,*d,*q; 1880 STACK_OF(X509) *sk=NULL; 1881 1882 n=ssl3_get_message(s, 1883 SSL3_ST_SR_CERT_A, 1884 SSL3_ST_SR_CERT_B, 1885 -1, 1886 s->max_cert_list, 1887 &ok); 1888 1889 if (!ok) return((int)n); 1890 1891 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) 1892 { 1893 if ( (s->verify_mode & SSL_VERIFY_PEER) && 1894 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) 1895 { 1896 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 1897 al=SSL_AD_HANDSHAKE_FAILURE; 1898 goto f_err; 1899 } 1900 /* If tls asked for a client cert, the client must return a 0 list */ 1901 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request) 1902 { 1903 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST); 1904 al=SSL_AD_UNEXPECTED_MESSAGE; 1905 goto f_err; 1906 } 1907 s->s3->tmp.reuse_message=1; 1908 return(1); 1909 } 1910 1911 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE) 1912 { 1913 al=SSL_AD_UNEXPECTED_MESSAGE; 1914 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE); 1915 goto f_err; 1916 } 1917 d=p=(unsigned char *)s->init_msg; 1918 1919 if ((sk=sk_X509_new_null()) == NULL) 1920 { 1921 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE); 1922 goto err; 1923 } 1924 1925 n2l3(p,llen); 1926 if (llen+3 != n) 1927 { 1928 al=SSL_AD_DECODE_ERROR; 1929 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH); 1930 goto f_err; 1931 } 1932 for (nc=0; nc<llen; ) 1933 { 1934 n2l3(p,l); 1935 if ((l+nc+3) > llen) 1936 { 1937 al=SSL_AD_DECODE_ERROR; 1938 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH); 1939 goto f_err; 1940 } 1941 1942 q=p; 1943 x=d2i_X509(NULL,&p,l); 1944 if (x == NULL) 1945 { 1946 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB); 1947 goto err; 1948 } 1949 if (p != (q+l)) 1950 { 1951 al=SSL_AD_DECODE_ERROR; 1952 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH); 1953 goto f_err; 1954 } 1955 if (!sk_X509_push(sk,x)) 1956 { 1957 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE); 1958 goto err; 1959 } 1960 x=NULL; 1961 nc+=l+3; 1962 } 1963 1964 if (sk_X509_num(sk) <= 0) 1965 { 1966 /* TLS does not mind 0 certs returned */ 1967 if (s->version == SSL3_VERSION) 1968 { 1969 al=SSL_AD_HANDSHAKE_FAILURE; 1970 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED); 1971 goto f_err; 1972 } 1973 /* Fail for TLS only if we required a certificate */ 1974 else if ((s->verify_mode & SSL_VERIFY_PEER) && 1975 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) 1976 { 1977 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 1978 al=SSL_AD_HANDSHAKE_FAILURE; 1979 goto f_err; 1980 } 1981 } 1982 else 1983 { 1984 i=ssl_verify_cert_chain(s,sk); 1985 if (!i) 1986 { 1987 al=ssl_verify_alarm_type(s->verify_result); 1988 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED); 1989 goto f_err; 1990 } 1991 } 1992 1993 if (s->session->peer != NULL) /* This should not be needed */ 1994 X509_free(s->session->peer); 1995 s->session->peer=sk_X509_shift(sk); 1996 s->session->verify_result = s->verify_result; 1997 1998 /* With the current implementation, sess_cert will always be NULL 1999 * when we arrive here. */ 2000 if (s->session->sess_cert == NULL) 2001 { 2002 s->session->sess_cert = ssl_sess_cert_new(); 2003 if (s->session->sess_cert == NULL) 2004 { 2005 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); 2006 goto err; 2007 } 2008 } 2009 if (s->session->sess_cert->cert_chain != NULL) 2010 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free); 2011 s->session->sess_cert->cert_chain=sk; 2012 /* Inconsistency alert: cert_chain does *not* include the 2013 * peer's own certificate, while we do include it in s3_clnt.c */ 2014 2015 sk=NULL; 2016 2017 ret=1; 2018 if (0) 2019 { 2020f_err: 2021 ssl3_send_alert(s,SSL3_AL_FATAL,al); 2022 } 2023err: 2024 if (x != NULL) X509_free(x); 2025 if (sk != NULL) sk_X509_pop_free(sk,X509_free); 2026 return(ret); 2027 } 2028 2029int ssl3_send_server_certificate(SSL *s) 2030 { 2031 unsigned long l; 2032 X509 *x; 2033 2034 if (s->state == SSL3_ST_SW_CERT_A) 2035 { 2036 x=ssl_get_server_send_cert(s); 2037 if (x == NULL && 2038 /* VRS: allow null cert if auth == KRB5 */ 2039 (s->s3->tmp.new_cipher->algorithms 2040 & (SSL_MKEY_MASK|SSL_AUTH_MASK)) 2041 != (SSL_aKRB5|SSL_kKRB5)) 2042 { 2043 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR); 2044 return(0); 2045 } 2046 2047 l=ssl3_output_cert_chain(s,x); 2048 s->state=SSL3_ST_SW_CERT_B; 2049 s->init_num=(int)l; 2050 s->init_off=0; 2051 } 2052 2053 /* SSL3_ST_SW_CERT_B */ 2054 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); 2055 } 2056