1/* ssl/d1_clnt.c */ 2/* 3 * DTLS implementation written by Nagendra Modadugu 4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. 5 */ 6/* ==================================================================== 7 * Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * openssl-core@OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay@cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh@cryptsoft.com). 57 * 58 */ 59/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 60 * All rights reserved. 61 * 62 * This package is an SSL implementation written 63 * by Eric Young (eay@cryptsoft.com). 64 * The implementation was written so as to conform with Netscapes SSL. 65 * 66 * This library is free for commercial and non-commercial use as long as 67 * the following conditions are aheared to. The following conditions 68 * apply to all code found in this distribution, be it the RC4, RSA, 69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 70 * included with this distribution is covered by the same copyright terms 71 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 72 * 73 * Copyright remains Eric Young's, and as such any Copyright notices in 74 * the code are not to be removed. 75 * If this package is used in a product, Eric Young should be given attribution 76 * as the author of the parts of the library used. 77 * This can be in the form of a textual message at program startup or 78 * in documentation (online or textual) provided with the package. 79 * 80 * Redistribution and use in source and binary forms, with or without 81 * modification, are permitted provided that the following conditions 82 * are met: 83 * 1. Redistributions of source code must retain the copyright 84 * notice, this list of conditions and the following disclaimer. 85 * 2. Redistributions in binary form must reproduce the above copyright 86 * notice, this list of conditions and the following disclaimer in the 87 * documentation and/or other materials provided with the distribution. 88 * 3. All advertising materials mentioning features or use of this software 89 * must display the following acknowledgement: 90 * "This product includes cryptographic software written by 91 * Eric Young (eay@cryptsoft.com)" 92 * The word 'cryptographic' can be left out if the rouines from the library 93 * being used are not cryptographic related :-). 94 * 4. If you include any Windows specific code (or a derivative thereof) from 95 * the apps directory (application code) you must include an acknowledgement: 96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 97 * 98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 101 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 108 * SUCH DAMAGE. 109 * 110 * The licence and distribution terms for any publically available version or 111 * derivative of this code cannot be changed. i.e. this code cannot simply be 112 * copied and put under another distribution licence 113 * [including the GNU Public Licence.] 114 */ 115 116#include <stdio.h> 117#include "ssl_locl.h" 118#ifndef OPENSSL_NO_KRB5 119#include "kssl_lcl.h" 120#endif 121#include <openssl/buffer.h> 122#include <openssl/rand.h> 123#include <openssl/objects.h> 124#include <openssl/evp.h> 125#include <openssl/md5.h> 126#include <openssl/bn.h> 127#ifndef OPENSSL_NO_DH 128#include <openssl/dh.h> 129#endif 130 131static const SSL_METHOD *dtls1_get_client_method(int ver); 132static int dtls1_get_hello_verify(SSL *s); 133 134static const SSL_METHOD *dtls1_get_client_method(int ver) 135 { 136 if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER) 137 return(DTLSv1_client_method()); 138 else 139 return(NULL); 140 } 141 142IMPLEMENT_dtls1_meth_func(DTLSv1_client_method, 143 ssl_undefined_function, 144 dtls1_connect, 145 dtls1_get_client_method) 146 147int dtls1_connect(SSL *s) 148 { 149 BUF_MEM *buf=NULL; 150 unsigned long Time=(unsigned long)time(NULL); 151 void (*cb)(const SSL *ssl,int type,int val)=NULL; 152 int ret= -1; 153 int new_state,state,skip=0;; 154 155 RAND_add(&Time,sizeof(Time),0); 156 ERR_clear_error(); 157 clear_sys_error(); 158 159 if (s->info_callback != NULL) 160 cb=s->info_callback; 161 else if (s->ctx->info_callback != NULL) 162 cb=s->ctx->info_callback; 163 164 s->in_handshake++; 165 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 166 167 for (;;) 168 { 169 state=s->state; 170 171 switch(s->state) 172 { 173 case SSL_ST_RENEGOTIATE: 174 s->new_session=1; 175 s->state=SSL_ST_CONNECT; 176 s->ctx->stats.sess_connect_renegotiate++; 177 /* break */ 178 case SSL_ST_BEFORE: 179 case SSL_ST_CONNECT: 180 case SSL_ST_BEFORE|SSL_ST_CONNECT: 181 case SSL_ST_OK|SSL_ST_CONNECT: 182 183 s->server=0; 184 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 185 186 if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) && 187 (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00)) 188 { 189 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR); 190 ret = -1; 191 goto end; 192 } 193 194 /* s->version=SSL3_VERSION; */ 195 s->type=SSL_ST_CONNECT; 196 197 if (s->init_buf == NULL) 198 { 199 if ((buf=BUF_MEM_new()) == NULL) 200 { 201 ret= -1; 202 goto end; 203 } 204 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 205 { 206 ret= -1; 207 goto end; 208 } 209 s->init_buf=buf; 210 buf=NULL; 211 } 212 213 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } 214 215 /* setup buffing BIO */ 216 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; } 217 218 /* don't push the buffering BIO quite yet */ 219 220 s->state=SSL3_ST_CW_CLNT_HELLO_A; 221 s->ctx->stats.sess_connect++; 222 s->init_num=0; 223 /* mark client_random uninitialized */ 224 memset(s->s3->client_random,0,sizeof(s->s3->client_random)); 225 s->d1->send_cookie = 0; 226 s->hit = 0; 227 break; 228 229 case SSL3_ST_CW_CLNT_HELLO_A: 230 case SSL3_ST_CW_CLNT_HELLO_B: 231 232 s->shutdown=0; 233 234 /* every DTLS ClientHello resets Finished MAC */ 235 ssl3_init_finished_mac(s); 236 237 dtls1_start_timer(s); 238 ret=dtls1_client_hello(s); 239 if (ret <= 0) goto end; 240 241 if ( s->d1->send_cookie) 242 { 243 s->state=SSL3_ST_CW_FLUSH; 244 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A; 245 } 246 else 247 s->state=SSL3_ST_CR_SRVR_HELLO_A; 248 249 s->init_num=0; 250 251 /* turn on buffering for the next lot of output */ 252 if (s->bbio != s->wbio) 253 s->wbio=BIO_push(s->bbio,s->wbio); 254 255 break; 256 257 case SSL3_ST_CR_SRVR_HELLO_A: 258 case SSL3_ST_CR_SRVR_HELLO_B: 259 ret=ssl3_get_server_hello(s); 260 if (ret <= 0) goto end; 261 else 262 { 263 if (s->hit) 264 s->state=SSL3_ST_CR_FINISHED_A; 265 else 266 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 267 } 268 s->init_num=0; 269 break; 270 271 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 272 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 273 274 ret = dtls1_get_hello_verify(s); 275 if ( ret <= 0) 276 goto end; 277 dtls1_stop_timer(s); 278 if ( s->d1->send_cookie) /* start again, with a cookie */ 279 s->state=SSL3_ST_CW_CLNT_HELLO_A; 280 else 281 s->state = SSL3_ST_CR_CERT_A; 282 s->init_num = 0; 283 break; 284 285 case SSL3_ST_CR_CERT_A: 286 case SSL3_ST_CR_CERT_B: 287#ifndef OPENSSL_NO_TLSEXT 288 ret=ssl3_check_finished(s); 289 if (ret <= 0) goto end; 290 if (ret == 2) 291 { 292 s->hit = 1; 293 if (s->tlsext_ticket_expected) 294 s->state=SSL3_ST_CR_SESSION_TICKET_A; 295 else 296 s->state=SSL3_ST_CR_FINISHED_A; 297 s->init_num=0; 298 break; 299 } 300#endif 301 /* Check if it is anon DH or PSK */ 302 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 303 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 304 { 305 ret=ssl3_get_server_certificate(s); 306 if (ret <= 0) goto end; 307#ifndef OPENSSL_NO_TLSEXT 308 if (s->tlsext_status_expected) 309 s->state=SSL3_ST_CR_CERT_STATUS_A; 310 else 311 s->state=SSL3_ST_CR_KEY_EXCH_A; 312 } 313 else 314 { 315 skip = 1; 316 s->state=SSL3_ST_CR_KEY_EXCH_A; 317 } 318#else 319 } 320 else 321 skip=1; 322 323 s->state=SSL3_ST_CR_KEY_EXCH_A; 324#endif 325 s->init_num=0; 326 break; 327 328 case SSL3_ST_CR_KEY_EXCH_A: 329 case SSL3_ST_CR_KEY_EXCH_B: 330 ret=ssl3_get_key_exchange(s); 331 if (ret <= 0) goto end; 332 s->state=SSL3_ST_CR_CERT_REQ_A; 333 s->init_num=0; 334 335 /* at this point we check that we have the 336 * required stuff from the server */ 337 if (!ssl3_check_cert_and_algorithm(s)) 338 { 339 ret= -1; 340 goto end; 341 } 342 break; 343 344 case SSL3_ST_CR_CERT_REQ_A: 345 case SSL3_ST_CR_CERT_REQ_B: 346 ret=ssl3_get_certificate_request(s); 347 if (ret <= 0) goto end; 348 s->state=SSL3_ST_CR_SRVR_DONE_A; 349 s->init_num=0; 350 break; 351 352 case SSL3_ST_CR_SRVR_DONE_A: 353 case SSL3_ST_CR_SRVR_DONE_B: 354 ret=ssl3_get_server_done(s); 355 if (ret <= 0) goto end; 356 dtls1_stop_timer(s); 357 if (s->s3->tmp.cert_req) 358 s->state=SSL3_ST_CW_CERT_A; 359 else 360 s->state=SSL3_ST_CW_KEY_EXCH_A; 361 s->init_num=0; 362 363 break; 364 365 case SSL3_ST_CW_CERT_A: 366 case SSL3_ST_CW_CERT_B: 367 case SSL3_ST_CW_CERT_C: 368 case SSL3_ST_CW_CERT_D: 369 dtls1_start_timer(s); 370 ret=dtls1_send_client_certificate(s); 371 if (ret <= 0) goto end; 372 s->state=SSL3_ST_CW_KEY_EXCH_A; 373 s->init_num=0; 374 break; 375 376 case SSL3_ST_CW_KEY_EXCH_A: 377 case SSL3_ST_CW_KEY_EXCH_B: 378 dtls1_start_timer(s); 379 ret=dtls1_send_client_key_exchange(s); 380 if (ret <= 0) goto end; 381 /* EAY EAY EAY need to check for DH fix cert 382 * sent back */ 383 /* For TLS, cert_req is set to 2, so a cert chain 384 * of nothing is sent, but no verify packet is sent */ 385 if (s->s3->tmp.cert_req == 1) 386 { 387 s->state=SSL3_ST_CW_CERT_VRFY_A; 388 } 389 else 390 { 391 s->state=SSL3_ST_CW_CHANGE_A; 392 s->s3->change_cipher_spec=0; 393 } 394 395 s->init_num=0; 396 break; 397 398 case SSL3_ST_CW_CERT_VRFY_A: 399 case SSL3_ST_CW_CERT_VRFY_B: 400 dtls1_start_timer(s); 401 ret=dtls1_send_client_verify(s); 402 if (ret <= 0) goto end; 403 s->state=SSL3_ST_CW_CHANGE_A; 404 s->init_num=0; 405 s->s3->change_cipher_spec=0; 406 break; 407 408 case SSL3_ST_CW_CHANGE_A: 409 case SSL3_ST_CW_CHANGE_B: 410 if (!s->hit) 411 dtls1_start_timer(s); 412 ret=dtls1_send_change_cipher_spec(s, 413 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B); 414 if (ret <= 0) goto end; 415 s->state=SSL3_ST_CW_FINISHED_A; 416 s->init_num=0; 417 418 s->session->cipher=s->s3->tmp.new_cipher; 419#ifdef OPENSSL_NO_COMP 420 s->session->compress_meth=0; 421#else 422 if (s->s3->tmp.new_compression == NULL) 423 s->session->compress_meth=0; 424 else 425 s->session->compress_meth= 426 s->s3->tmp.new_compression->id; 427#endif 428 if (!s->method->ssl3_enc->setup_key_block(s)) 429 { 430 ret= -1; 431 goto end; 432 } 433 434 if (!s->method->ssl3_enc->change_cipher_state(s, 435 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 436 { 437 ret= -1; 438 goto end; 439 } 440 441 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 442 break; 443 444 case SSL3_ST_CW_FINISHED_A: 445 case SSL3_ST_CW_FINISHED_B: 446 if (!s->hit) 447 dtls1_start_timer(s); 448 ret=dtls1_send_finished(s, 449 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B, 450 s->method->ssl3_enc->client_finished_label, 451 s->method->ssl3_enc->client_finished_label_len); 452 if (ret <= 0) goto end; 453 s->state=SSL3_ST_CW_FLUSH; 454 455 /* clear flags */ 456 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER; 457 if (s->hit) 458 { 459 s->s3->tmp.next_state=SSL_ST_OK; 460 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) 461 { 462 s->state=SSL_ST_OK; 463 s->s3->flags|=SSL3_FLAGS_POP_BUFFER; 464 s->s3->delay_buf_pop_ret=0; 465 } 466 } 467 else 468 { 469#ifndef OPENSSL_NO_TLSEXT 470 /* Allow NewSessionTicket if ticket expected */ 471 if (s->tlsext_ticket_expected) 472 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A; 473 else 474#endif 475 476 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A; 477 } 478 s->init_num=0; 479 break; 480 481#ifndef OPENSSL_NO_TLSEXT 482 case SSL3_ST_CR_SESSION_TICKET_A: 483 case SSL3_ST_CR_SESSION_TICKET_B: 484 ret=ssl3_get_new_session_ticket(s); 485 if (ret <= 0) goto end; 486 s->state=SSL3_ST_CR_FINISHED_A; 487 s->init_num=0; 488 break; 489 490 case SSL3_ST_CR_CERT_STATUS_A: 491 case SSL3_ST_CR_CERT_STATUS_B: 492 ret=ssl3_get_cert_status(s); 493 if (ret <= 0) goto end; 494 s->state=SSL3_ST_CR_KEY_EXCH_A; 495 s->init_num=0; 496 break; 497#endif 498 499 case SSL3_ST_CR_FINISHED_A: 500 case SSL3_ST_CR_FINISHED_B: 501 s->d1->change_cipher_spec_ok = 1; 502 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A, 503 SSL3_ST_CR_FINISHED_B); 504 if (ret <= 0) goto end; 505 dtls1_stop_timer(s); 506 507 if (s->hit) 508 s->state=SSL3_ST_CW_CHANGE_A; 509 else 510 s->state=SSL_ST_OK; 511 s->init_num=0; 512 break; 513 514 case SSL3_ST_CW_FLUSH: 515 s->rwstate=SSL_WRITING; 516 if (BIO_flush(s->wbio) <= 0) 517 { 518 ret= -1; 519 goto end; 520 } 521 s->rwstate=SSL_NOTHING; 522 s->state=s->s3->tmp.next_state; 523 break; 524 525 case SSL_ST_OK: 526 /* clean a few things up */ 527 ssl3_cleanup_key_block(s); 528 529#if 0 530 if (s->init_buf != NULL) 531 { 532 BUF_MEM_free(s->init_buf); 533 s->init_buf=NULL; 534 } 535#endif 536 537 /* If we are not 'joining' the last two packets, 538 * remove the buffering now */ 539 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 540 ssl_free_wbio_buffer(s); 541 /* else do it later in ssl3_write */ 542 543 s->init_num=0; 544 s->new_session=0; 545 546 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT); 547 if (s->hit) s->ctx->stats.sess_hit++; 548 549 ret=1; 550 /* s->server=0; */ 551 s->handshake_func=dtls1_connect; 552 s->ctx->stats.sess_connect_good++; 553 554 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 555 556 /* done with handshaking */ 557 s->d1->handshake_read_seq = 0; 558 s->d1->next_handshake_write_seq = 0; 559 goto end; 560 /* break; */ 561 562 default: 563 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE); 564 ret= -1; 565 goto end; 566 /* break; */ 567 } 568 569 /* did we do anything */ 570 if (!s->s3->tmp.reuse_message && !skip) 571 { 572 if (s->debug) 573 { 574 if ((ret=BIO_flush(s->wbio)) <= 0) 575 goto end; 576 } 577 578 if ((cb != NULL) && (s->state != state)) 579 { 580 new_state=s->state; 581 s->state=state; 582 cb(s,SSL_CB_CONNECT_LOOP,1); 583 s->state=new_state; 584 } 585 } 586 skip=0; 587 } 588end: 589 s->in_handshake--; 590 if (buf != NULL) 591 BUF_MEM_free(buf); 592 if (cb != NULL) 593 cb(s,SSL_CB_CONNECT_EXIT,ret); 594 return(ret); 595 } 596 597int dtls1_client_hello(SSL *s) 598 { 599 unsigned char *buf; 600 unsigned char *p,*d; 601 unsigned int i,j; 602 unsigned long Time,l; 603 SSL_COMP *comp; 604 605 buf=(unsigned char *)s->init_buf->data; 606 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) 607 { 608 SSL_SESSION *sess = s->session; 609 if ((s->session == NULL) || 610 (s->session->ssl_version != s->version) || 611#ifdef OPENSSL_NO_TLSEXT 612 !sess->session_id_length || 613#else 614 (!sess->session_id_length && !sess->tlsext_tick) || 615#endif 616 (s->session->not_resumable)) 617 { 618 if (!ssl_get_new_session(s,0)) 619 goto err; 620 } 621 /* else use the pre-loaded session */ 622 623 p=s->s3->client_random; 624 625 /* if client_random is initialized, reuse it, we are 626 * required to use same upon reply to HelloVerify */ 627 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ; 628 if (i==sizeof(s->s3->client_random)) 629 { 630 Time=(unsigned long)time(NULL); /* Time */ 631 l2n(Time,p); 632 RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4); 633 } 634 635 /* Do the message type and length last */ 636 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 637 638 *(p++)=s->version>>8; 639 *(p++)=s->version&0xff; 640 s->client_version=s->version; 641 642 /* Random stuff */ 643 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 644 p+=SSL3_RANDOM_SIZE; 645 646 /* Session ID */ 647 if (s->new_session) 648 i=0; 649 else 650 i=s->session->session_id_length; 651 *(p++)=i; 652 if (i != 0) 653 { 654 if (i > sizeof s->session->session_id) 655 { 656 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 657 goto err; 658 } 659 memcpy(p,s->session->session_id,i); 660 p+=i; 661 } 662 663 /* cookie stuff */ 664 if ( s->d1->cookie_len > sizeof(s->d1->cookie)) 665 { 666 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 667 goto err; 668 } 669 *(p++) = s->d1->cookie_len; 670 memcpy(p, s->d1->cookie, s->d1->cookie_len); 671 p += s->d1->cookie_len; 672 673 /* Ciphers supported */ 674 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0); 675 if (i == 0) 676 { 677 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 678 goto err; 679 } 680 s2n(i,p); 681 p+=i; 682 683 /* COMPRESSION */ 684 if (s->ctx->comp_methods == NULL) 685 j=0; 686 else 687 j=sk_SSL_COMP_num(s->ctx->comp_methods); 688 *(p++)=1+j; 689 for (i=0; i<j; i++) 690 { 691 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 692 *(p++)=comp->id; 693 } 694 *(p++)=0; /* Add the NULL method */ 695 696#ifndef OPENSSL_NO_TLSEXT 697 /* TLS extensions*/ 698 if (ssl_prepare_clienthello_tlsext(s) <= 0) 699 { 700 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT); 701 goto err; 702 } 703 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 704 { 705 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 706 goto err; 707 } 708#endif 709 710 l=(p-d); 711 d=buf; 712 713 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l); 714 715 s->state=SSL3_ST_CW_CLNT_HELLO_B; 716 /* number of bytes to write */ 717 s->init_num=p-buf; 718 s->init_off=0; 719 720 /* buffer the message to handle re-xmits */ 721 dtls1_buffer_message(s, 0); 722 } 723 724 /* SSL3_ST_CW_CLNT_HELLO_B */ 725 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 726err: 727 return(-1); 728 } 729 730static int dtls1_get_hello_verify(SSL *s) 731 { 732 int n, al, ok = 0; 733 unsigned char *data; 734 unsigned int cookie_len; 735 736 n=s->method->ssl_get_message(s, 737 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 738 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 739 -1, 740 s->max_cert_list, 741 &ok); 742 743 if (!ok) return((int)n); 744 745 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) 746 { 747 s->d1->send_cookie = 0; 748 s->s3->tmp.reuse_message=1; 749 return(1); 750 } 751 752 data = (unsigned char *)s->init_msg; 753 754 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff))) 755 { 756 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION); 757 s->version=(s->version&0xff00)|data[1]; 758 al = SSL_AD_PROTOCOL_VERSION; 759 goto f_err; 760 } 761 data+=2; 762 763 cookie_len = *(data++); 764 if ( cookie_len > sizeof(s->d1->cookie)) 765 { 766 al=SSL_AD_ILLEGAL_PARAMETER; 767 goto f_err; 768 } 769 770 memcpy(s->d1->cookie, data, cookie_len); 771 s->d1->cookie_len = cookie_len; 772 773 s->d1->send_cookie = 1; 774 return 1; 775 776f_err: 777 ssl3_send_alert(s, SSL3_AL_FATAL, al); 778 return -1; 779 } 780 781int dtls1_send_client_key_exchange(SSL *s) 782 { 783 unsigned char *p,*d; 784 int n; 785 unsigned long alg_k; 786#ifndef OPENSSL_NO_RSA 787 unsigned char *q; 788 EVP_PKEY *pkey=NULL; 789#endif 790#ifndef OPENSSL_NO_KRB5 791 KSSL_ERR kssl_err; 792#endif /* OPENSSL_NO_KRB5 */ 793#ifndef OPENSSL_NO_ECDH 794 EC_KEY *clnt_ecdh = NULL; 795 const EC_POINT *srvr_ecpoint = NULL; 796 EVP_PKEY *srvr_pub_pkey = NULL; 797 unsigned char *encodedPoint = NULL; 798 int encoded_pt_len = 0; 799 BN_CTX * bn_ctx = NULL; 800#endif 801 802 if (s->state == SSL3_ST_CW_KEY_EXCH_A) 803 { 804 d=(unsigned char *)s->init_buf->data; 805 p= &(d[DTLS1_HM_HEADER_LENGTH]); 806 807 alg_k=s->s3->tmp.new_cipher->algorithm_mkey; 808 809 /* Fool emacs indentation */ 810 if (0) {} 811#ifndef OPENSSL_NO_RSA 812 else if (alg_k & SSL_kRSA) 813 { 814 RSA *rsa; 815 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 816 817 if (s->session->sess_cert == NULL) 818 { 819 /* We should always have a server certificate with SSL_kRSA. */ 820 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 821 goto err; 822 } 823 824 if (s->session->sess_cert->peer_rsa_tmp != NULL) 825 rsa=s->session->sess_cert->peer_rsa_tmp; 826 else 827 { 828 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 829 if ((pkey == NULL) || 830 (pkey->type != EVP_PKEY_RSA) || 831 (pkey->pkey.rsa == NULL)) 832 { 833 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 834 goto err; 835 } 836 rsa=pkey->pkey.rsa; 837 EVP_PKEY_free(pkey); 838 } 839 840 tmp_buf[0]=s->client_version>>8; 841 tmp_buf[1]=s->client_version&0xff; 842 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) 843 goto err; 844 845 s->session->master_key_length=sizeof tmp_buf; 846 847 q=p; 848 /* Fix buf for TLS and [incidentally] DTLS */ 849 if (s->version > SSL3_VERSION) 850 p+=2; 851 n=RSA_public_encrypt(sizeof tmp_buf, 852 tmp_buf,p,rsa,RSA_PKCS1_PADDING); 853#ifdef PKCS1_CHECK 854 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++; 855 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70; 856#endif 857 if (n <= 0) 858 { 859 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT); 860 goto err; 861 } 862 863 /* Fix buf for TLS and [incidentally] DTLS */ 864 if (s->version > SSL3_VERSION) 865 { 866 s2n(n,q); 867 n+=2; 868 } 869 870 s->session->master_key_length= 871 s->method->ssl3_enc->generate_master_secret(s, 872 s->session->master_key, 873 tmp_buf,sizeof tmp_buf); 874 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf); 875 } 876#endif 877#ifndef OPENSSL_NO_KRB5 878 else if (alg_k & SSL_kKRB5) 879 { 880 krb5_error_code krb5rc; 881 KSSL_CTX *kssl_ctx = s->kssl_ctx; 882 /* krb5_data krb5_ap_req; */ 883 krb5_data *enc_ticket; 884 krb5_data authenticator, *authp = NULL; 885 EVP_CIPHER_CTX ciph_ctx; 886 const EVP_CIPHER *enc = NULL; 887 unsigned char iv[EVP_MAX_IV_LENGTH]; 888 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 889 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH 890 + EVP_MAX_IV_LENGTH]; 891 int padl, outl = sizeof(epms); 892 893 EVP_CIPHER_CTX_init(&ciph_ctx); 894 895#ifdef KSSL_DEBUG 896 printf("ssl3_send_client_key_exchange(%lx & %lx)\n", 897 alg_k, SSL_kKRB5); 898#endif /* KSSL_DEBUG */ 899 900 authp = NULL; 901#ifdef KRB5SENDAUTH 902 if (KRB5SENDAUTH) authp = &authenticator; 903#endif /* KRB5SENDAUTH */ 904 905 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, 906 &kssl_err); 907 enc = kssl_map_enc(kssl_ctx->enctype); 908 if (enc == NULL) 909 goto err; 910#ifdef KSSL_DEBUG 911 { 912 printf("kssl_cget_tkt rtn %d\n", krb5rc); 913 if (krb5rc && kssl_err.text) 914 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 915 } 916#endif /* KSSL_DEBUG */ 917 918 if (krb5rc) 919 { 920 ssl3_send_alert(s,SSL3_AL_FATAL, 921 SSL_AD_HANDSHAKE_FAILURE); 922 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 923 kssl_err.reason); 924 goto err; 925 } 926 927 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ 928 ** in place of RFC 2712 KerberosWrapper, as in: 929 ** 930 ** Send ticket (copy to *p, set n = length) 931 ** n = krb5_ap_req.length; 932 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 933 ** if (krb5_ap_req.data) 934 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 935 ** 936 ** Now using real RFC 2712 KerberosWrapper 937 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) 938 ** Note: 2712 "opaque" types are here replaced 939 ** with a 2-byte length followed by the value. 940 ** Example: 941 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 942 ** Where "xx xx" = length bytes. Shown here with 943 ** optional authenticator omitted. 944 */ 945 946 /* KerberosWrapper.Ticket */ 947 s2n(enc_ticket->length,p); 948 memcpy(p, enc_ticket->data, enc_ticket->length); 949 p+= enc_ticket->length; 950 n = enc_ticket->length + 2; 951 952 /* KerberosWrapper.Authenticator */ 953 if (authp && authp->length) 954 { 955 s2n(authp->length,p); 956 memcpy(p, authp->data, authp->length); 957 p+= authp->length; 958 n+= authp->length + 2; 959 960 free(authp->data); 961 authp->data = NULL; 962 authp->length = 0; 963 } 964 else 965 { 966 s2n(0,p);/* null authenticator length */ 967 n+=2; 968 } 969 970 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0) 971 goto err; 972 973 /* 20010420 VRS. Tried it this way; failed. 974 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 975 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 976 ** kssl_ctx->length); 977 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 978 */ 979 980 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 981 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL, 982 kssl_ctx->key,iv); 983 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf, 984 sizeof tmp_buf); 985 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl); 986 outl += padl; 987 if (outl > (int)sizeof epms) 988 { 989 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 990 goto err; 991 } 992 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 993 994 /* KerberosWrapper.EncryptedPreMasterSecret */ 995 s2n(outl,p); 996 memcpy(p, epms, outl); 997 p+=outl; 998 n+=outl + 2; 999 1000 s->session->master_key_length= 1001 s->method->ssl3_enc->generate_master_secret(s, 1002 s->session->master_key, 1003 tmp_buf, sizeof tmp_buf); 1004 1005 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 1006 OPENSSL_cleanse(epms, outl); 1007 } 1008#endif 1009#ifndef OPENSSL_NO_DH 1010 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 1011 { 1012 DH *dh_srvr,*dh_clnt; 1013 1014 if (s->session->sess_cert == NULL) 1015 { 1016 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 1017 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE); 1018 goto err; 1019 } 1020 1021 if (s->session->sess_cert->peer_dh_tmp != NULL) 1022 dh_srvr=s->session->sess_cert->peer_dh_tmp; 1023 else 1024 { 1025 /* we get them from the cert */ 1026 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1027 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1028 goto err; 1029 } 1030 1031 /* generate a new random key */ 1032 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL) 1033 { 1034 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1035 goto err; 1036 } 1037 if (!DH_generate_key(dh_clnt)) 1038 { 1039 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1040 goto err; 1041 } 1042 1043 /* use the 'p' output buffer for the DH key, but 1044 * make sure to clear it out afterwards */ 1045 1046 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt); 1047 1048 if (n <= 0) 1049 { 1050 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1051 goto err; 1052 } 1053 1054 /* generate master key from the result */ 1055 s->session->master_key_length= 1056 s->method->ssl3_enc->generate_master_secret(s, 1057 s->session->master_key,p,n); 1058 /* clean up */ 1059 memset(p,0,n); 1060 1061 /* send off the data */ 1062 n=BN_num_bytes(dh_clnt->pub_key); 1063 s2n(n,p); 1064 BN_bn2bin(dh_clnt->pub_key,p); 1065 n+=2; 1066 1067 DH_free(dh_clnt); 1068 1069 /* perhaps clean things up a bit EAY EAY EAY EAY*/ 1070 } 1071#endif 1072#ifndef OPENSSL_NO_ECDH 1073 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) 1074 { 1075 const EC_GROUP *srvr_group = NULL; 1076 EC_KEY *tkey; 1077 int ecdh_clnt_cert = 0; 1078 int field_size = 0; 1079 1080 if (s->session->sess_cert == NULL) 1081 { 1082 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 1083 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE); 1084 goto err; 1085 } 1086 1087 /* Did we send out the client's 1088 * ECDH share for use in premaster 1089 * computation as part of client certificate? 1090 * If so, set ecdh_clnt_cert to 1. 1091 */ 1092 if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 1093 { 1094 /* XXX: For now, we do not support client 1095 * authentication using ECDH certificates. 1096 * To add such support, one needs to add 1097 * code that checks for appropriate 1098 * conditions and sets ecdh_clnt_cert to 1. 1099 * For example, the cert have an ECC 1100 * key on the same curve as the server's 1101 * and the key should be authorized for 1102 * key agreement. 1103 * 1104 * One also needs to add code in ssl3_connect 1105 * to skip sending the certificate verify 1106 * message. 1107 * 1108 * if ((s->cert->key->privatekey != NULL) && 1109 * (s->cert->key->privatekey->type == 1110 * EVP_PKEY_EC) && ...) 1111 * ecdh_clnt_cert = 1; 1112 */ 1113 } 1114 1115 if (s->session->sess_cert->peer_ecdh_tmp != NULL) 1116 { 1117 tkey = s->session->sess_cert->peer_ecdh_tmp; 1118 } 1119 else 1120 { 1121 /* Get the Server Public Key from Cert */ 1122 srvr_pub_pkey = X509_get_pubkey(s->session-> \ 1123 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1124 if ((srvr_pub_pkey == NULL) || 1125 (srvr_pub_pkey->type != EVP_PKEY_EC) || 1126 (srvr_pub_pkey->pkey.ec == NULL)) 1127 { 1128 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1129 ERR_R_INTERNAL_ERROR); 1130 goto err; 1131 } 1132 1133 tkey = srvr_pub_pkey->pkey.ec; 1134 } 1135 1136 srvr_group = EC_KEY_get0_group(tkey); 1137 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 1138 1139 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) 1140 { 1141 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1142 ERR_R_INTERNAL_ERROR); 1143 goto err; 1144 } 1145 1146 if ((clnt_ecdh=EC_KEY_new()) == NULL) 1147 { 1148 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1149 goto err; 1150 } 1151 1152 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) 1153 { 1154 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1155 goto err; 1156 } 1157 if (ecdh_clnt_cert) 1158 { 1159 /* Reuse key info from our certificate 1160 * We only need our private key to perform 1161 * the ECDH computation. 1162 */ 1163 const BIGNUM *priv_key; 1164 tkey = s->cert->key->privatekey->pkey.ec; 1165 priv_key = EC_KEY_get0_private_key(tkey); 1166 if (priv_key == NULL) 1167 { 1168 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1169 goto err; 1170 } 1171 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) 1172 { 1173 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1174 goto err; 1175 } 1176 } 1177 else 1178 { 1179 /* Generate a new ECDH key pair */ 1180 if (!(EC_KEY_generate_key(clnt_ecdh))) 1181 { 1182 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1183 goto err; 1184 } 1185 } 1186 1187 /* use the 'p' output buffer for the ECDH key, but 1188 * make sure to clear it out afterwards 1189 */ 1190 1191 field_size = EC_GROUP_get_degree(srvr_group); 1192 if (field_size <= 0) 1193 { 1194 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1195 ERR_R_ECDH_LIB); 1196 goto err; 1197 } 1198 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL); 1199 if (n <= 0) 1200 { 1201 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1202 ERR_R_ECDH_LIB); 1203 goto err; 1204 } 1205 1206 /* generate master key from the result */ 1207 s->session->master_key_length = s->method->ssl3_enc \ 1208 -> generate_master_secret(s, 1209 s->session->master_key, 1210 p, n); 1211 1212 memset(p, 0, n); /* clean up */ 1213 1214 if (ecdh_clnt_cert) 1215 { 1216 /* Send empty client key exch message */ 1217 n = 0; 1218 } 1219 else 1220 { 1221 /* First check the size of encoding and 1222 * allocate memory accordingly. 1223 */ 1224 encoded_pt_len = 1225 EC_POINT_point2oct(srvr_group, 1226 EC_KEY_get0_public_key(clnt_ecdh), 1227 POINT_CONVERSION_UNCOMPRESSED, 1228 NULL, 0, NULL); 1229 1230 encodedPoint = (unsigned char *) 1231 OPENSSL_malloc(encoded_pt_len * 1232 sizeof(unsigned char)); 1233 bn_ctx = BN_CTX_new(); 1234 if ((encodedPoint == NULL) || 1235 (bn_ctx == NULL)) 1236 { 1237 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1238 goto err; 1239 } 1240 1241 /* Encode the public key */ 1242 n = EC_POINT_point2oct(srvr_group, 1243 EC_KEY_get0_public_key(clnt_ecdh), 1244 POINT_CONVERSION_UNCOMPRESSED, 1245 encodedPoint, encoded_pt_len, bn_ctx); 1246 1247 *p = n; /* length of encoded point */ 1248 /* Encoded point will be copied here */ 1249 p += 1; 1250 /* copy the point */ 1251 memcpy((unsigned char *)p, encodedPoint, n); 1252 /* increment n to account for length field */ 1253 n += 1; 1254 } 1255 1256 /* Free allocated memory */ 1257 BN_CTX_free(bn_ctx); 1258 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1259 if (clnt_ecdh != NULL) 1260 EC_KEY_free(clnt_ecdh); 1261 EVP_PKEY_free(srvr_pub_pkey); 1262 } 1263#endif /* !OPENSSL_NO_ECDH */ 1264 1265#ifndef OPENSSL_NO_PSK 1266 else if (alg_k & SSL_kPSK) 1267 { 1268 char identity[PSK_MAX_IDENTITY_LEN]; 1269 unsigned char *t = NULL; 1270 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4]; 1271 unsigned int pre_ms_len = 0, psk_len = 0; 1272 int psk_err = 1; 1273 1274 n = 0; 1275 if (s->psk_client_callback == NULL) 1276 { 1277 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1278 SSL_R_PSK_NO_CLIENT_CB); 1279 goto err; 1280 } 1281 1282 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint, 1283 identity, PSK_MAX_IDENTITY_LEN, 1284 psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1285 if (psk_len > PSK_MAX_PSK_LEN) 1286 { 1287 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1288 ERR_R_INTERNAL_ERROR); 1289 goto psk_err; 1290 } 1291 else if (psk_len == 0) 1292 { 1293 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1294 SSL_R_PSK_IDENTITY_NOT_FOUND); 1295 goto psk_err; 1296 } 1297 1298 /* create PSK pre_master_secret */ 1299 pre_ms_len = 2+psk_len+2+psk_len; 1300 t = psk_or_pre_ms; 1301 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len); 1302 s2n(psk_len, t); 1303 memset(t, 0, psk_len); 1304 t+=psk_len; 1305 s2n(psk_len, t); 1306 1307 if (s->session->psk_identity_hint != NULL) 1308 OPENSSL_free(s->session->psk_identity_hint); 1309 s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint); 1310 if (s->ctx->psk_identity_hint != NULL && 1311 s->session->psk_identity_hint == NULL) 1312 { 1313 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1314 ERR_R_MALLOC_FAILURE); 1315 goto psk_err; 1316 } 1317 1318 if (s->session->psk_identity != NULL) 1319 OPENSSL_free(s->session->psk_identity); 1320 s->session->psk_identity = BUF_strdup(identity); 1321 if (s->session->psk_identity == NULL) 1322 { 1323 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1324 ERR_R_MALLOC_FAILURE); 1325 goto psk_err; 1326 } 1327 1328 s->session->master_key_length = 1329 s->method->ssl3_enc->generate_master_secret(s, 1330 s->session->master_key, 1331 psk_or_pre_ms, pre_ms_len); 1332 n = strlen(identity); 1333 s2n(n, p); 1334 memcpy(p, identity, n); 1335 n+=2; 1336 psk_err = 0; 1337 psk_err: 1338 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN); 1339 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1340 if (psk_err != 0) 1341 { 1342 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1343 goto err; 1344 } 1345 } 1346#endif 1347 else 1348 { 1349 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1350 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1351 goto err; 1352 } 1353 1354 d = dtls1_set_message_header(s, d, 1355 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); 1356 /* 1357 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 1358 l2n3(n,d); 1359 l2n(s->d1->handshake_write_seq,d); 1360 s->d1->handshake_write_seq++; 1361 */ 1362 1363 s->state=SSL3_ST_CW_KEY_EXCH_B; 1364 /* number of bytes to write */ 1365 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1366 s->init_off=0; 1367 1368 /* buffer the message to handle re-xmits */ 1369 dtls1_buffer_message(s, 0); 1370 } 1371 1372 /* SSL3_ST_CW_KEY_EXCH_B */ 1373 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1374err: 1375#ifndef OPENSSL_NO_ECDH 1376 BN_CTX_free(bn_ctx); 1377 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1378 if (clnt_ecdh != NULL) 1379 EC_KEY_free(clnt_ecdh); 1380 EVP_PKEY_free(srvr_pub_pkey); 1381#endif 1382 return(-1); 1383 } 1384 1385int dtls1_send_client_verify(SSL *s) 1386 { 1387 unsigned char *p,*d; 1388 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1389 EVP_PKEY *pkey; 1390#ifndef OPENSSL_NO_RSA 1391 unsigned u=0; 1392#endif 1393 unsigned long n; 1394#if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA) 1395 int j; 1396#endif 1397 1398 if (s->state == SSL3_ST_CW_CERT_VRFY_A) 1399 { 1400 d=(unsigned char *)s->init_buf->data; 1401 p= &(d[DTLS1_HM_HEADER_LENGTH]); 1402 pkey=s->cert->key->privatekey; 1403 1404 s->method->ssl3_enc->cert_verify_mac(s, 1405 NID_sha1, 1406 &(data[MD5_DIGEST_LENGTH])); 1407 1408#ifndef OPENSSL_NO_RSA 1409 if (pkey->type == EVP_PKEY_RSA) 1410 { 1411 s->method->ssl3_enc->cert_verify_mac(s, 1412 NID_md5, 1413 &(data[0])); 1414 if (RSA_sign(NID_md5_sha1, data, 1415 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, 1416 &(p[2]), &u, pkey->pkey.rsa) <= 0 ) 1417 { 1418 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB); 1419 goto err; 1420 } 1421 s2n(u,p); 1422 n=u+2; 1423 } 1424 else 1425#endif 1426#ifndef OPENSSL_NO_DSA 1427 if (pkey->type == EVP_PKEY_DSA) 1428 { 1429 if (!DSA_sign(pkey->save_type, 1430 &(data[MD5_DIGEST_LENGTH]), 1431 SHA_DIGEST_LENGTH,&(p[2]), 1432 (unsigned int *)&j,pkey->pkey.dsa)) 1433 { 1434 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB); 1435 goto err; 1436 } 1437 s2n(j,p); 1438 n=j+2; 1439 } 1440 else 1441#endif 1442#ifndef OPENSSL_NO_ECDSA 1443 if (pkey->type == EVP_PKEY_EC) 1444 { 1445 if (!ECDSA_sign(pkey->save_type, 1446 &(data[MD5_DIGEST_LENGTH]), 1447 SHA_DIGEST_LENGTH,&(p[2]), 1448 (unsigned int *)&j,pkey->pkey.ec)) 1449 { 1450 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, 1451 ERR_R_ECDSA_LIB); 1452 goto err; 1453 } 1454 s2n(j,p); 1455 n=j+2; 1456 } 1457 else 1458#endif 1459 { 1460 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR); 1461 goto err; 1462 } 1463 1464 d = dtls1_set_message_header(s, d, 1465 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ; 1466 1467 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH; 1468 s->init_off=0; 1469 1470 /* buffer the message to handle re-xmits */ 1471 dtls1_buffer_message(s, 0); 1472 1473 s->state = SSL3_ST_CW_CERT_VRFY_B; 1474 } 1475 1476 /* s->state = SSL3_ST_CW_CERT_VRFY_B */ 1477 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1478err: 1479 return(-1); 1480 } 1481 1482int dtls1_send_client_certificate(SSL *s) 1483 { 1484 X509 *x509=NULL; 1485 EVP_PKEY *pkey=NULL; 1486 int i; 1487 unsigned long l; 1488 1489 if (s->state == SSL3_ST_CW_CERT_A) 1490 { 1491 if ((s->cert == NULL) || 1492 (s->cert->key->x509 == NULL) || 1493 (s->cert->key->privatekey == NULL)) 1494 s->state=SSL3_ST_CW_CERT_B; 1495 else 1496 s->state=SSL3_ST_CW_CERT_C; 1497 } 1498 1499 /* We need to get a client cert */ 1500 if (s->state == SSL3_ST_CW_CERT_B) 1501 { 1502 /* If we get an error, we need to 1503 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 1504 * We then get retied later */ 1505 i=0; 1506 i = ssl_do_client_cert_cb(s, &x509, &pkey); 1507 if (i < 0) 1508 { 1509 s->rwstate=SSL_X509_LOOKUP; 1510 return(-1); 1511 } 1512 s->rwstate=SSL_NOTHING; 1513 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) 1514 { 1515 s->state=SSL3_ST_CW_CERT_B; 1516 if ( !SSL_use_certificate(s,x509) || 1517 !SSL_use_PrivateKey(s,pkey)) 1518 i=0; 1519 } 1520 else if (i == 1) 1521 { 1522 i=0; 1523 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 1524 } 1525 1526 if (x509 != NULL) X509_free(x509); 1527 if (pkey != NULL) EVP_PKEY_free(pkey); 1528 if (i == 0) 1529 { 1530 if (s->version == SSL3_VERSION) 1531 { 1532 s->s3->tmp.cert_req=0; 1533 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE); 1534 return(1); 1535 } 1536 else 1537 { 1538 s->s3->tmp.cert_req=2; 1539 } 1540 } 1541 1542 /* Ok, we have a cert */ 1543 s->state=SSL3_ST_CW_CERT_C; 1544 } 1545 1546 if (s->state == SSL3_ST_CW_CERT_C) 1547 { 1548 s->state=SSL3_ST_CW_CERT_D; 1549 l=dtls1_output_cert_chain(s, 1550 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509); 1551 if (!l) 1552 { 1553 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); 1554 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR); 1555 return 0; 1556 } 1557 s->init_num=(int)l; 1558 s->init_off=0; 1559 1560 /* set header called by dtls1_output_cert_chain() */ 1561 1562 /* buffer the message to handle re-xmits */ 1563 dtls1_buffer_message(s, 0); 1564 } 1565 /* SSL3_ST_CW_CERT_D */ 1566 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1567 } 1568