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 dtls1_stop_timer(s); 264 if (s->hit) 265 s->state=SSL3_ST_CR_FINISHED_A; 266 else 267 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 268 } 269 s->init_num=0; 270 break; 271 272 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 273 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 274 275 ret = dtls1_get_hello_verify(s); 276 if ( ret <= 0) 277 goto end; 278 dtls1_stop_timer(s); 279 if ( s->d1->send_cookie) /* start again, with a cookie */ 280 s->state=SSL3_ST_CW_CLNT_HELLO_A; 281 else 282 s->state = SSL3_ST_CR_CERT_A; 283 s->init_num = 0; 284 break; 285 286 case SSL3_ST_CR_CERT_A: 287 case SSL3_ST_CR_CERT_B: 288#ifndef OPENSSL_NO_TLSEXT 289 ret=ssl3_check_finished(s); 290 if (ret <= 0) goto end; 291 if (ret == 2) 292 { 293 s->hit = 1; 294 if (s->tlsext_ticket_expected) 295 s->state=SSL3_ST_CR_SESSION_TICKET_A; 296 else 297 s->state=SSL3_ST_CR_FINISHED_A; 298 s->init_num=0; 299 break; 300 } 301#endif 302 /* Check if it is anon DH or PSK */ 303 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 304 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 305 { 306 ret=ssl3_get_server_certificate(s); 307 if (ret <= 0) goto end; 308#ifndef OPENSSL_NO_TLSEXT 309 if (s->tlsext_status_expected) 310 s->state=SSL3_ST_CR_CERT_STATUS_A; 311 else 312 s->state=SSL3_ST_CR_KEY_EXCH_A; 313 } 314 else 315 { 316 skip = 1; 317 s->state=SSL3_ST_CR_KEY_EXCH_A; 318 } 319#else 320 } 321 else 322 skip=1; 323 324 s->state=SSL3_ST_CR_KEY_EXCH_A; 325#endif 326 s->init_num=0; 327 break; 328 329 case SSL3_ST_CR_KEY_EXCH_A: 330 case SSL3_ST_CR_KEY_EXCH_B: 331 ret=ssl3_get_key_exchange(s); 332 if (ret <= 0) goto end; 333 s->state=SSL3_ST_CR_CERT_REQ_A; 334 s->init_num=0; 335 336 /* at this point we check that we have the 337 * required stuff from the server */ 338 if (!ssl3_check_cert_and_algorithm(s)) 339 { 340 ret= -1; 341 goto end; 342 } 343 break; 344 345 case SSL3_ST_CR_CERT_REQ_A: 346 case SSL3_ST_CR_CERT_REQ_B: 347 ret=ssl3_get_certificate_request(s); 348 if (ret <= 0) goto end; 349 s->state=SSL3_ST_CR_SRVR_DONE_A; 350 s->init_num=0; 351 break; 352 353 case SSL3_ST_CR_SRVR_DONE_A: 354 case SSL3_ST_CR_SRVR_DONE_B: 355 ret=ssl3_get_server_done(s); 356 if (ret <= 0) goto end; 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 dtls1_start_timer(s); 411 ret=dtls1_send_change_cipher_spec(s, 412 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B); 413 if (ret <= 0) goto end; 414 s->state=SSL3_ST_CW_FINISHED_A; 415 s->init_num=0; 416 417 s->session->cipher=s->s3->tmp.new_cipher; 418#ifdef OPENSSL_NO_COMP 419 s->session->compress_meth=0; 420#else 421 if (s->s3->tmp.new_compression == NULL) 422 s->session->compress_meth=0; 423 else 424 s->session->compress_meth= 425 s->s3->tmp.new_compression->id; 426#endif 427 if (!s->method->ssl3_enc->setup_key_block(s)) 428 { 429 ret= -1; 430 goto end; 431 } 432 433 if (!s->method->ssl3_enc->change_cipher_state(s, 434 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 435 { 436 ret= -1; 437 goto end; 438 } 439 440 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 441 break; 442 443 case SSL3_ST_CW_FINISHED_A: 444 case SSL3_ST_CW_FINISHED_B: 445 dtls1_start_timer(s); 446 ret=dtls1_send_finished(s, 447 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B, 448 s->method->ssl3_enc->client_finished_label, 449 s->method->ssl3_enc->client_finished_label_len); 450 if (ret <= 0) goto end; 451 s->state=SSL3_ST_CW_FLUSH; 452 453 /* clear flags */ 454 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER; 455 if (s->hit) 456 { 457 s->s3->tmp.next_state=SSL_ST_OK; 458 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) 459 { 460 s->state=SSL_ST_OK; 461 s->s3->flags|=SSL3_FLAGS_POP_BUFFER; 462 s->s3->delay_buf_pop_ret=0; 463 } 464 } 465 else 466 { 467#ifndef OPENSSL_NO_TLSEXT 468 /* Allow NewSessionTicket if ticket expected */ 469 if (s->tlsext_ticket_expected) 470 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A; 471 else 472#endif 473 474 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A; 475 } 476 s->init_num=0; 477 break; 478 479#ifndef OPENSSL_NO_TLSEXT 480 case SSL3_ST_CR_SESSION_TICKET_A: 481 case SSL3_ST_CR_SESSION_TICKET_B: 482 ret=ssl3_get_new_session_ticket(s); 483 if (ret <= 0) goto end; 484 s->state=SSL3_ST_CR_FINISHED_A; 485 s->init_num=0; 486 break; 487 488 case SSL3_ST_CR_CERT_STATUS_A: 489 case SSL3_ST_CR_CERT_STATUS_B: 490 ret=ssl3_get_cert_status(s); 491 if (ret <= 0) goto end; 492 s->state=SSL3_ST_CR_KEY_EXCH_A; 493 s->init_num=0; 494 break; 495#endif 496 497 case SSL3_ST_CR_FINISHED_A: 498 case SSL3_ST_CR_FINISHED_B: 499 s->d1->change_cipher_spec_ok = 1; 500 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A, 501 SSL3_ST_CR_FINISHED_B); 502 if (ret <= 0) goto end; 503 dtls1_stop_timer(s); 504 505 if (s->hit) 506 s->state=SSL3_ST_CW_CHANGE_A; 507 else 508 s->state=SSL_ST_OK; 509 s->init_num=0; 510 break; 511 512 case SSL3_ST_CW_FLUSH: 513 s->rwstate=SSL_WRITING; 514 if (BIO_flush(s->wbio) <= 0) 515 { 516 ret= -1; 517 goto end; 518 } 519 s->rwstate=SSL_NOTHING; 520 s->state=s->s3->tmp.next_state; 521 break; 522 523 case SSL_ST_OK: 524 /* clean a few things up */ 525 ssl3_cleanup_key_block(s); 526 527#if 0 528 if (s->init_buf != NULL) 529 { 530 BUF_MEM_free(s->init_buf); 531 s->init_buf=NULL; 532 } 533#endif 534 535 /* If we are not 'joining' the last two packets, 536 * remove the buffering now */ 537 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 538 ssl_free_wbio_buffer(s); 539 /* else do it later in ssl3_write */ 540 541 s->init_num=0; 542 s->new_session=0; 543 544 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT); 545 if (s->hit) s->ctx->stats.sess_hit++; 546 547 ret=1; 548 /* s->server=0; */ 549 s->handshake_func=dtls1_connect; 550 s->ctx->stats.sess_connect_good++; 551 552 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 553 554 /* done with handshaking */ 555 s->d1->handshake_read_seq = 0; 556 s->d1->next_handshake_write_seq = 0; 557 goto end; 558 /* break; */ 559 560 default: 561 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE); 562 ret= -1; 563 goto end; 564 /* break; */ 565 } 566 567 /* did we do anything */ 568 if (!s->s3->tmp.reuse_message && !skip) 569 { 570 if (s->debug) 571 { 572 if ((ret=BIO_flush(s->wbio)) <= 0) 573 goto end; 574 } 575 576 if ((cb != NULL) && (s->state != state)) 577 { 578 new_state=s->state; 579 s->state=state; 580 cb(s,SSL_CB_CONNECT_LOOP,1); 581 s->state=new_state; 582 } 583 } 584 skip=0; 585 } 586end: 587 s->in_handshake--; 588 if (buf != NULL) 589 BUF_MEM_free(buf); 590 if (cb != NULL) 591 cb(s,SSL_CB_CONNECT_EXIT,ret); 592 return(ret); 593 } 594 595int dtls1_client_hello(SSL *s) 596 { 597 unsigned char *buf; 598 unsigned char *p,*d; 599 unsigned int i,j; 600 unsigned long Time,l; 601 SSL_COMP *comp; 602 603 buf=(unsigned char *)s->init_buf->data; 604 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) 605 { 606 SSL_SESSION *sess = s->session; 607 if ((s->session == NULL) || 608 (s->session->ssl_version != s->version) || 609#ifdef OPENSSL_NO_TLSEXT 610 !sess->session_id_length || 611#else 612 (!sess->session_id_length && !sess->tlsext_tick) || 613#endif 614 (s->session->not_resumable)) 615 { 616 if (!ssl_get_new_session(s,0)) 617 goto err; 618 } 619 /* else use the pre-loaded session */ 620 621 p=s->s3->client_random; 622 623 /* if client_random is initialized, reuse it, we are 624 * required to use same upon reply to HelloVerify */ 625 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ; 626 if (i==sizeof(s->s3->client_random)) 627 { 628 Time=(unsigned long)time(NULL); /* Time */ 629 l2n(Time,p); 630 RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4); 631 } 632 633 /* Do the message type and length last */ 634 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 635 636 *(p++)=s->version>>8; 637 *(p++)=s->version&0xff; 638 s->client_version=s->version; 639 640 /* Random stuff */ 641 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 642 p+=SSL3_RANDOM_SIZE; 643 644 /* Session ID */ 645 if (s->new_session) 646 i=0; 647 else 648 i=s->session->session_id_length; 649 *(p++)=i; 650 if (i != 0) 651 { 652 if (i > sizeof s->session->session_id) 653 { 654 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 655 goto err; 656 } 657 memcpy(p,s->session->session_id,i); 658 p+=i; 659 } 660 661 /* cookie stuff */ 662 if ( s->d1->cookie_len > sizeof(s->d1->cookie)) 663 { 664 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 665 goto err; 666 } 667 *(p++) = s->d1->cookie_len; 668 memcpy(p, s->d1->cookie, s->d1->cookie_len); 669 p += s->d1->cookie_len; 670 671 /* Ciphers supported */ 672 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0); 673 if (i == 0) 674 { 675 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 676 goto err; 677 } 678 s2n(i,p); 679 p+=i; 680 681 /* COMPRESSION */ 682 if (s->ctx->comp_methods == NULL) 683 j=0; 684 else 685 j=sk_SSL_COMP_num(s->ctx->comp_methods); 686 *(p++)=1+j; 687 for (i=0; i<j; i++) 688 { 689 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 690 *(p++)=comp->id; 691 } 692 *(p++)=0; /* Add the NULL method */ 693 694#ifndef OPENSSL_NO_TLSEXT 695 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 696 { 697 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 698 goto err; 699 } 700#endif 701 702 l=(p-d); 703 d=buf; 704 705 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l); 706 707 s->state=SSL3_ST_CW_CLNT_HELLO_B; 708 /* number of bytes to write */ 709 s->init_num=p-buf; 710 s->init_off=0; 711 712 /* buffer the message to handle re-xmits */ 713 dtls1_buffer_message(s, 0); 714 } 715 716 /* SSL3_ST_CW_CLNT_HELLO_B */ 717 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 718err: 719 return(-1); 720 } 721 722static int dtls1_get_hello_verify(SSL *s) 723 { 724 int n, al, ok = 0; 725 unsigned char *data; 726 unsigned int cookie_len; 727 728 n=s->method->ssl_get_message(s, 729 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 730 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 731 -1, 732 s->max_cert_list, 733 &ok); 734 735 if (!ok) return((int)n); 736 737 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) 738 { 739 s->d1->send_cookie = 0; 740 s->s3->tmp.reuse_message=1; 741 return(1); 742 } 743 744 data = (unsigned char *)s->init_msg; 745 746 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff))) 747 { 748 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION); 749 s->version=(s->version&0xff00)|data[1]; 750 al = SSL_AD_PROTOCOL_VERSION; 751 goto f_err; 752 } 753 data+=2; 754 755 cookie_len = *(data++); 756 if ( cookie_len > sizeof(s->d1->cookie)) 757 { 758 al=SSL_AD_ILLEGAL_PARAMETER; 759 goto f_err; 760 } 761 762 memcpy(s->d1->cookie, data, cookie_len); 763 s->d1->cookie_len = cookie_len; 764 765 s->d1->send_cookie = 1; 766 return 1; 767 768f_err: 769 ssl3_send_alert(s, SSL3_AL_FATAL, al); 770 return -1; 771 } 772 773int dtls1_send_client_key_exchange(SSL *s) 774 { 775 unsigned char *p,*d; 776 int n; 777 unsigned long alg_k; 778#ifndef OPENSSL_NO_RSA 779 unsigned char *q; 780 EVP_PKEY *pkey=NULL; 781#endif 782#ifndef OPENSSL_NO_KRB5 783 KSSL_ERR kssl_err; 784#endif /* OPENSSL_NO_KRB5 */ 785#ifndef OPENSSL_NO_ECDH 786 EC_KEY *clnt_ecdh = NULL; 787 const EC_POINT *srvr_ecpoint = NULL; 788 EVP_PKEY *srvr_pub_pkey = NULL; 789 unsigned char *encodedPoint = NULL; 790 int encoded_pt_len = 0; 791 BN_CTX * bn_ctx = NULL; 792#endif 793 794 if (s->state == SSL3_ST_CW_KEY_EXCH_A) 795 { 796 d=(unsigned char *)s->init_buf->data; 797 p= &(d[DTLS1_HM_HEADER_LENGTH]); 798 799 alg_k=s->s3->tmp.new_cipher->algorithm_mkey; 800 801 /* Fool emacs indentation */ 802 if (0) {} 803#ifndef OPENSSL_NO_RSA 804 else if (alg_k & SSL_kRSA) 805 { 806 RSA *rsa; 807 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 808 809 if (s->session->sess_cert->peer_rsa_tmp != NULL) 810 rsa=s->session->sess_cert->peer_rsa_tmp; 811 else 812 { 813 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 814 if ((pkey == NULL) || 815 (pkey->type != EVP_PKEY_RSA) || 816 (pkey->pkey.rsa == NULL)) 817 { 818 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 819 goto err; 820 } 821 rsa=pkey->pkey.rsa; 822 EVP_PKEY_free(pkey); 823 } 824 825 tmp_buf[0]=s->client_version>>8; 826 tmp_buf[1]=s->client_version&0xff; 827 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) 828 goto err; 829 830 s->session->master_key_length=sizeof tmp_buf; 831 832 q=p; 833 /* Fix buf for TLS and [incidentally] DTLS */ 834 if (s->version > SSL3_VERSION) 835 p+=2; 836 n=RSA_public_encrypt(sizeof tmp_buf, 837 tmp_buf,p,rsa,RSA_PKCS1_PADDING); 838#ifdef PKCS1_CHECK 839 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++; 840 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70; 841#endif 842 if (n <= 0) 843 { 844 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT); 845 goto err; 846 } 847 848 /* Fix buf for TLS and [incidentally] DTLS */ 849 if (s->version > SSL3_VERSION) 850 { 851 s2n(n,q); 852 n+=2; 853 } 854 855 s->session->master_key_length= 856 s->method->ssl3_enc->generate_master_secret(s, 857 s->session->master_key, 858 tmp_buf,sizeof tmp_buf); 859 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf); 860 } 861#endif 862#ifndef OPENSSL_NO_KRB5 863 else if (alg_k & SSL_kKRB5) 864 { 865 krb5_error_code krb5rc; 866 KSSL_CTX *kssl_ctx = s->kssl_ctx; 867 /* krb5_data krb5_ap_req; */ 868 krb5_data *enc_ticket; 869 krb5_data authenticator, *authp = NULL; 870 EVP_CIPHER_CTX ciph_ctx; 871 const EVP_CIPHER *enc = NULL; 872 unsigned char iv[EVP_MAX_IV_LENGTH]; 873 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 874 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH 875 + EVP_MAX_IV_LENGTH]; 876 int padl, outl = sizeof(epms); 877 878 EVP_CIPHER_CTX_init(&ciph_ctx); 879 880#ifdef KSSL_DEBUG 881 printf("ssl3_send_client_key_exchange(%lx & %lx)\n", 882 alg_k, SSL_kKRB5); 883#endif /* KSSL_DEBUG */ 884 885 authp = NULL; 886#ifdef KRB5SENDAUTH 887 if (KRB5SENDAUTH) authp = &authenticator; 888#endif /* KRB5SENDAUTH */ 889 890 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, 891 &kssl_err); 892 enc = kssl_map_enc(kssl_ctx->enctype); 893 if (enc == NULL) 894 goto err; 895#ifdef KSSL_DEBUG 896 { 897 printf("kssl_cget_tkt rtn %d\n", krb5rc); 898 if (krb5rc && kssl_err.text) 899 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 900 } 901#endif /* KSSL_DEBUG */ 902 903 if (krb5rc) 904 { 905 ssl3_send_alert(s,SSL3_AL_FATAL, 906 SSL_AD_HANDSHAKE_FAILURE); 907 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 908 kssl_err.reason); 909 goto err; 910 } 911 912 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ 913 ** in place of RFC 2712 KerberosWrapper, as in: 914 ** 915 ** Send ticket (copy to *p, set n = length) 916 ** n = krb5_ap_req.length; 917 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 918 ** if (krb5_ap_req.data) 919 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 920 ** 921 ** Now using real RFC 2712 KerberosWrapper 922 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) 923 ** Note: 2712 "opaque" types are here replaced 924 ** with a 2-byte length followed by the value. 925 ** Example: 926 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 927 ** Where "xx xx" = length bytes. Shown here with 928 ** optional authenticator omitted. 929 */ 930 931 /* KerberosWrapper.Ticket */ 932 s2n(enc_ticket->length,p); 933 memcpy(p, enc_ticket->data, enc_ticket->length); 934 p+= enc_ticket->length; 935 n = enc_ticket->length + 2; 936 937 /* KerberosWrapper.Authenticator */ 938 if (authp && authp->length) 939 { 940 s2n(authp->length,p); 941 memcpy(p, authp->data, authp->length); 942 p+= authp->length; 943 n+= authp->length + 2; 944 945 free(authp->data); 946 authp->data = NULL; 947 authp->length = 0; 948 } 949 else 950 { 951 s2n(0,p);/* null authenticator length */ 952 n+=2; 953 } 954 955 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0) 956 goto err; 957 958 /* 20010420 VRS. Tried it this way; failed. 959 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 960 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 961 ** kssl_ctx->length); 962 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 963 */ 964 965 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 966 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL, 967 kssl_ctx->key,iv); 968 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf, 969 sizeof tmp_buf); 970 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl); 971 outl += padl; 972 if (outl > (int)sizeof epms) 973 { 974 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 975 goto err; 976 } 977 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 978 979 /* KerberosWrapper.EncryptedPreMasterSecret */ 980 s2n(outl,p); 981 memcpy(p, epms, outl); 982 p+=outl; 983 n+=outl + 2; 984 985 s->session->master_key_length= 986 s->method->ssl3_enc->generate_master_secret(s, 987 s->session->master_key, 988 tmp_buf, sizeof tmp_buf); 989 990 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 991 OPENSSL_cleanse(epms, outl); 992 } 993#endif 994#ifndef OPENSSL_NO_DH 995 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 996 { 997 DH *dh_srvr,*dh_clnt; 998 999 if (s->session->sess_cert->peer_dh_tmp != NULL) 1000 dh_srvr=s->session->sess_cert->peer_dh_tmp; 1001 else 1002 { 1003 /* we get them from the cert */ 1004 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1005 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1006 goto err; 1007 } 1008 1009 /* generate a new random key */ 1010 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL) 1011 { 1012 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1013 goto err; 1014 } 1015 if (!DH_generate_key(dh_clnt)) 1016 { 1017 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1018 goto err; 1019 } 1020 1021 /* use the 'p' output buffer for the DH key, but 1022 * make sure to clear it out afterwards */ 1023 1024 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt); 1025 1026 if (n <= 0) 1027 { 1028 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1029 goto err; 1030 } 1031 1032 /* generate master key from the result */ 1033 s->session->master_key_length= 1034 s->method->ssl3_enc->generate_master_secret(s, 1035 s->session->master_key,p,n); 1036 /* clean up */ 1037 memset(p,0,n); 1038 1039 /* send off the data */ 1040 n=BN_num_bytes(dh_clnt->pub_key); 1041 s2n(n,p); 1042 BN_bn2bin(dh_clnt->pub_key,p); 1043 n+=2; 1044 1045 DH_free(dh_clnt); 1046 1047 /* perhaps clean things up a bit EAY EAY EAY EAY*/ 1048 } 1049#endif 1050#ifndef OPENSSL_NO_ECDH 1051 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) 1052 { 1053 const EC_GROUP *srvr_group = NULL; 1054 EC_KEY *tkey; 1055 int ecdh_clnt_cert = 0; 1056 int field_size = 0; 1057 1058 /* Did we send out the client's 1059 * ECDH share for use in premaster 1060 * computation as part of client certificate? 1061 * If so, set ecdh_clnt_cert to 1. 1062 */ 1063 if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 1064 { 1065 /* XXX: For now, we do not support client 1066 * authentication using ECDH certificates. 1067 * To add such support, one needs to add 1068 * code that checks for appropriate 1069 * conditions and sets ecdh_clnt_cert to 1. 1070 * For example, the cert have an ECC 1071 * key on the same curve as the server's 1072 * and the key should be authorized for 1073 * key agreement. 1074 * 1075 * One also needs to add code in ssl3_connect 1076 * to skip sending the certificate verify 1077 * message. 1078 * 1079 * if ((s->cert->key->privatekey != NULL) && 1080 * (s->cert->key->privatekey->type == 1081 * EVP_PKEY_EC) && ...) 1082 * ecdh_clnt_cert = 1; 1083 */ 1084 } 1085 1086 if (s->session->sess_cert->peer_ecdh_tmp != NULL) 1087 { 1088 tkey = s->session->sess_cert->peer_ecdh_tmp; 1089 } 1090 else 1091 { 1092 /* Get the Server Public Key from Cert */ 1093 srvr_pub_pkey = X509_get_pubkey(s->session-> \ 1094 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1095 if ((srvr_pub_pkey == NULL) || 1096 (srvr_pub_pkey->type != EVP_PKEY_EC) || 1097 (srvr_pub_pkey->pkey.ec == NULL)) 1098 { 1099 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1100 ERR_R_INTERNAL_ERROR); 1101 goto err; 1102 } 1103 1104 tkey = srvr_pub_pkey->pkey.ec; 1105 } 1106 1107 srvr_group = EC_KEY_get0_group(tkey); 1108 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 1109 1110 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) 1111 { 1112 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1113 ERR_R_INTERNAL_ERROR); 1114 goto err; 1115 } 1116 1117 if ((clnt_ecdh=EC_KEY_new()) == NULL) 1118 { 1119 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1120 goto err; 1121 } 1122 1123 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) 1124 { 1125 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1126 goto err; 1127 } 1128 if (ecdh_clnt_cert) 1129 { 1130 /* Reuse key info from our certificate 1131 * We only need our private key to perform 1132 * the ECDH computation. 1133 */ 1134 const BIGNUM *priv_key; 1135 tkey = s->cert->key->privatekey->pkey.ec; 1136 priv_key = EC_KEY_get0_private_key(tkey); 1137 if (priv_key == NULL) 1138 { 1139 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1140 goto err; 1141 } 1142 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) 1143 { 1144 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1145 goto err; 1146 } 1147 } 1148 else 1149 { 1150 /* Generate a new ECDH key pair */ 1151 if (!(EC_KEY_generate_key(clnt_ecdh))) 1152 { 1153 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1154 goto err; 1155 } 1156 } 1157 1158 /* use the 'p' output buffer for the ECDH key, but 1159 * make sure to clear it out afterwards 1160 */ 1161 1162 field_size = EC_GROUP_get_degree(srvr_group); 1163 if (field_size <= 0) 1164 { 1165 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1166 ERR_R_ECDH_LIB); 1167 goto err; 1168 } 1169 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL); 1170 if (n <= 0) 1171 { 1172 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1173 ERR_R_ECDH_LIB); 1174 goto err; 1175 } 1176 1177 /* generate master key from the result */ 1178 s->session->master_key_length = s->method->ssl3_enc \ 1179 -> generate_master_secret(s, 1180 s->session->master_key, 1181 p, n); 1182 1183 memset(p, 0, n); /* clean up */ 1184 1185 if (ecdh_clnt_cert) 1186 { 1187 /* Send empty client key exch message */ 1188 n = 0; 1189 } 1190 else 1191 { 1192 /* First check the size of encoding and 1193 * allocate memory accordingly. 1194 */ 1195 encoded_pt_len = 1196 EC_POINT_point2oct(srvr_group, 1197 EC_KEY_get0_public_key(clnt_ecdh), 1198 POINT_CONVERSION_UNCOMPRESSED, 1199 NULL, 0, NULL); 1200 1201 encodedPoint = (unsigned char *) 1202 OPENSSL_malloc(encoded_pt_len * 1203 sizeof(unsigned char)); 1204 bn_ctx = BN_CTX_new(); 1205 if ((encodedPoint == NULL) || 1206 (bn_ctx == NULL)) 1207 { 1208 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1209 goto err; 1210 } 1211 1212 /* Encode the public key */ 1213 n = EC_POINT_point2oct(srvr_group, 1214 EC_KEY_get0_public_key(clnt_ecdh), 1215 POINT_CONVERSION_UNCOMPRESSED, 1216 encodedPoint, encoded_pt_len, bn_ctx); 1217 1218 *p = n; /* length of encoded point */ 1219 /* Encoded point will be copied here */ 1220 p += 1; 1221 /* copy the point */ 1222 memcpy((unsigned char *)p, encodedPoint, n); 1223 /* increment n to account for length field */ 1224 n += 1; 1225 } 1226 1227 /* Free allocated memory */ 1228 BN_CTX_free(bn_ctx); 1229 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1230 if (clnt_ecdh != NULL) 1231 EC_KEY_free(clnt_ecdh); 1232 EVP_PKEY_free(srvr_pub_pkey); 1233 } 1234#endif /* !OPENSSL_NO_ECDH */ 1235 1236#ifndef OPENSSL_NO_PSK 1237 else if (alg_k & SSL_kPSK) 1238 { 1239 char identity[PSK_MAX_IDENTITY_LEN]; 1240 unsigned char *t = NULL; 1241 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4]; 1242 unsigned int pre_ms_len = 0, psk_len = 0; 1243 int psk_err = 1; 1244 1245 n = 0; 1246 if (s->psk_client_callback == NULL) 1247 { 1248 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1249 SSL_R_PSK_NO_CLIENT_CB); 1250 goto err; 1251 } 1252 1253 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint, 1254 identity, PSK_MAX_IDENTITY_LEN, 1255 psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1256 if (psk_len > PSK_MAX_PSK_LEN) 1257 { 1258 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1259 ERR_R_INTERNAL_ERROR); 1260 goto psk_err; 1261 } 1262 else if (psk_len == 0) 1263 { 1264 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1265 SSL_R_PSK_IDENTITY_NOT_FOUND); 1266 goto psk_err; 1267 } 1268 1269 /* create PSK pre_master_secret */ 1270 pre_ms_len = 2+psk_len+2+psk_len; 1271 t = psk_or_pre_ms; 1272 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len); 1273 s2n(psk_len, t); 1274 memset(t, 0, psk_len); 1275 t+=psk_len; 1276 s2n(psk_len, t); 1277 1278 if (s->session->psk_identity_hint != NULL) 1279 OPENSSL_free(s->session->psk_identity_hint); 1280 s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint); 1281 if (s->ctx->psk_identity_hint != NULL && 1282 s->session->psk_identity_hint == NULL) 1283 { 1284 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1285 ERR_R_MALLOC_FAILURE); 1286 goto psk_err; 1287 } 1288 1289 if (s->session->psk_identity != NULL) 1290 OPENSSL_free(s->session->psk_identity); 1291 s->session->psk_identity = BUF_strdup(identity); 1292 if (s->session->psk_identity == NULL) 1293 { 1294 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1295 ERR_R_MALLOC_FAILURE); 1296 goto psk_err; 1297 } 1298 1299 s->session->master_key_length = 1300 s->method->ssl3_enc->generate_master_secret(s, 1301 s->session->master_key, 1302 psk_or_pre_ms, pre_ms_len); 1303 n = strlen(identity); 1304 s2n(n, p); 1305 memcpy(p, identity, n); 1306 n+=2; 1307 psk_err = 0; 1308 psk_err: 1309 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN); 1310 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1311 if (psk_err != 0) 1312 { 1313 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1314 goto err; 1315 } 1316 } 1317#endif 1318 else 1319 { 1320 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1321 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1322 goto err; 1323 } 1324 1325 d = dtls1_set_message_header(s, d, 1326 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); 1327 /* 1328 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 1329 l2n3(n,d); 1330 l2n(s->d1->handshake_write_seq,d); 1331 s->d1->handshake_write_seq++; 1332 */ 1333 1334 s->state=SSL3_ST_CW_KEY_EXCH_B; 1335 /* number of bytes to write */ 1336 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1337 s->init_off=0; 1338 1339 /* buffer the message to handle re-xmits */ 1340 dtls1_buffer_message(s, 0); 1341 } 1342 1343 /* SSL3_ST_CW_KEY_EXCH_B */ 1344 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1345err: 1346#ifndef OPENSSL_NO_ECDH 1347 BN_CTX_free(bn_ctx); 1348 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1349 if (clnt_ecdh != NULL) 1350 EC_KEY_free(clnt_ecdh); 1351 EVP_PKEY_free(srvr_pub_pkey); 1352#endif 1353 return(-1); 1354 } 1355 1356int dtls1_send_client_verify(SSL *s) 1357 { 1358 unsigned char *p,*d; 1359 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1360 EVP_PKEY *pkey; 1361#ifndef OPENSSL_NO_RSA 1362 unsigned u=0; 1363#endif 1364 unsigned long n; 1365#if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA) 1366 int j; 1367#endif 1368 1369 if (s->state == SSL3_ST_CW_CERT_VRFY_A) 1370 { 1371 d=(unsigned char *)s->init_buf->data; 1372 p= &(d[DTLS1_HM_HEADER_LENGTH]); 1373 pkey=s->cert->key->privatekey; 1374 1375 s->method->ssl3_enc->cert_verify_mac(s, 1376 NID_sha1, 1377 &(data[MD5_DIGEST_LENGTH])); 1378 1379#ifndef OPENSSL_NO_RSA 1380 if (pkey->type == EVP_PKEY_RSA) 1381 { 1382 s->method->ssl3_enc->cert_verify_mac(s, 1383 NID_md5, 1384 &(data[0])); 1385 if (RSA_sign(NID_md5_sha1, data, 1386 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, 1387 &(p[2]), &u, pkey->pkey.rsa) <= 0 ) 1388 { 1389 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB); 1390 goto err; 1391 } 1392 s2n(u,p); 1393 n=u+2; 1394 } 1395 else 1396#endif 1397#ifndef OPENSSL_NO_DSA 1398 if (pkey->type == EVP_PKEY_DSA) 1399 { 1400 if (!DSA_sign(pkey->save_type, 1401 &(data[MD5_DIGEST_LENGTH]), 1402 SHA_DIGEST_LENGTH,&(p[2]), 1403 (unsigned int *)&j,pkey->pkey.dsa)) 1404 { 1405 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB); 1406 goto err; 1407 } 1408 s2n(j,p); 1409 n=j+2; 1410 } 1411 else 1412#endif 1413#ifndef OPENSSL_NO_ECDSA 1414 if (pkey->type == EVP_PKEY_EC) 1415 { 1416 if (!ECDSA_sign(pkey->save_type, 1417 &(data[MD5_DIGEST_LENGTH]), 1418 SHA_DIGEST_LENGTH,&(p[2]), 1419 (unsigned int *)&j,pkey->pkey.ec)) 1420 { 1421 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, 1422 ERR_R_ECDSA_LIB); 1423 goto err; 1424 } 1425 s2n(j,p); 1426 n=j+2; 1427 } 1428 else 1429#endif 1430 { 1431 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR); 1432 goto err; 1433 } 1434 1435 d = dtls1_set_message_header(s, d, 1436 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ; 1437 1438 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH; 1439 s->init_off=0; 1440 1441 /* buffer the message to handle re-xmits */ 1442 dtls1_buffer_message(s, 0); 1443 1444 s->state = SSL3_ST_CW_CERT_VRFY_B; 1445 } 1446 1447 /* s->state = SSL3_ST_CW_CERT_VRFY_B */ 1448 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1449err: 1450 return(-1); 1451 } 1452 1453int dtls1_send_client_certificate(SSL *s) 1454 { 1455 X509 *x509=NULL; 1456 EVP_PKEY *pkey=NULL; 1457 int i; 1458 unsigned long l; 1459 1460 if (s->state == SSL3_ST_CW_CERT_A) 1461 { 1462 if ((s->cert == NULL) || 1463 (s->cert->key->x509 == NULL) || 1464 (s->cert->key->privatekey == NULL)) 1465 s->state=SSL3_ST_CW_CERT_B; 1466 else 1467 s->state=SSL3_ST_CW_CERT_C; 1468 } 1469 1470 /* We need to get a client cert */ 1471 if (s->state == SSL3_ST_CW_CERT_B) 1472 { 1473 /* If we get an error, we need to 1474 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 1475 * We then get retied later */ 1476 i=0; 1477 i = ssl_do_client_cert_cb(s, &x509, &pkey); 1478 if (i < 0) 1479 { 1480 s->rwstate=SSL_X509_LOOKUP; 1481 return(-1); 1482 } 1483 s->rwstate=SSL_NOTHING; 1484 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) 1485 { 1486 s->state=SSL3_ST_CW_CERT_B; 1487 if ( !SSL_use_certificate(s,x509) || 1488 !SSL_use_PrivateKey(s,pkey)) 1489 i=0; 1490 } 1491 else if (i == 1) 1492 { 1493 i=0; 1494 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 1495 } 1496 1497 if (x509 != NULL) X509_free(x509); 1498 if (pkey != NULL) EVP_PKEY_free(pkey); 1499 if (i == 0) 1500 { 1501 if (s->version == SSL3_VERSION) 1502 { 1503 s->s3->tmp.cert_req=0; 1504 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE); 1505 return(1); 1506 } 1507 else 1508 { 1509 s->s3->tmp.cert_req=2; 1510 } 1511 } 1512 1513 /* Ok, we have a cert */ 1514 s->state=SSL3_ST_CW_CERT_C; 1515 } 1516 1517 if (s->state == SSL3_ST_CW_CERT_C) 1518 { 1519 s->state=SSL3_ST_CW_CERT_D; 1520 l=dtls1_output_cert_chain(s, 1521 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509); 1522 s->init_num=(int)l; 1523 s->init_off=0; 1524 1525 /* set header called by dtls1_output_cert_chain() */ 1526 1527 /* buffer the message to handle re-xmits */ 1528 dtls1_buffer_message(s, 0); 1529 } 1530 /* SSL3_ST_CW_CERT_D */ 1531 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1532 } 1533 1534 1535