1 /* ssl/d1_clnt.c */ 2 /* 3 * DTLS implementation written by Nagendra Modadugu 4 * (nagendra (at) 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh (at) cryptsoft.com). 57 * 58 */ 59 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 60 * All rights reserved. 61 * 62 * This package is an SSL implementation written 63 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 130 131 static const SSL_METHOD *dtls1_get_client_method(int ver); 132 static int dtls1_get_hello_verify(SSL *s); 133 134 static 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 } 141 142 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method, 143 ssl_undefined_function, 144 dtls1_connect, 145 dtls1_get_client_method) 146 147 int 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 } 586 end: 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 } 594 595 int 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 (!s->session_creation_enabled) 617 { 618 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 619 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_SESSION_MAY_NOT_BE_CREATED); 620 goto err; 621 } 622 if (!ssl_get_new_session(s,0)) 623 goto err; 624 } 625 /* else use the pre-loaded session */ 626 627 p=s->s3->client_random; 628 629 /* if client_random is initialized, reuse it, we are 630 * required to use same upon reply to HelloVerify */ 631 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ; 632 if (i==sizeof(s->s3->client_random)) 633 { 634 Time=(unsigned long)time(NULL); /* Time */ 635 l2n(Time,p); 636 RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4); 637 } 638 639 /* Do the message type and length last */ 640 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 641 642 *(p++)=s->version>>8; 643 *(p++)=s->version&0xff; 644 s->client_version=s->version; 645 646 /* Random stuff */ 647 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 648 p+=SSL3_RANDOM_SIZE; 649 650 /* Session ID */ 651 if (s->new_session) 652 i=0; 653 else 654 i=s->session->session_id_length; 655 *(p++)=i; 656 if (i != 0) 657 { 658 if (i > sizeof s->session->session_id) 659 { 660 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 661 goto err; 662 } 663 memcpy(p,s->session->session_id,i); 664 p+=i; 665 } 666 667 /* cookie stuff */ 668 if ( s->d1->cookie_len > sizeof(s->d1->cookie)) 669 { 670 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 671 goto err; 672 } 673 *(p++) = s->d1->cookie_len; 674 memcpy(p, s->d1->cookie, s->d1->cookie_len); 675 p += s->d1->cookie_len; 676 677 /* Ciphers supported */ 678 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0); 679 if (i == 0) 680 { 681 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 682 goto err; 683 } 684 s2n(i,p); 685 p+=i; 686 687 /* COMPRESSION */ 688 if (s->ctx->comp_methods == NULL) 689 j=0; 690 else 691 j=sk_SSL_COMP_num(s->ctx->comp_methods); 692 *(p++)=1+j; 693 for (i=0; i<j; i++) 694 { 695 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 696 *(p++)=comp->id; 697 } 698 *(p++)=0; /* Add the NULL method */ 699 700 #ifndef OPENSSL_NO_TLSEXT 701 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 702 { 703 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 704 goto err; 705 } 706 #endif 707 708 l=(p-d); 709 d=buf; 710 711 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l); 712 713 s->state=SSL3_ST_CW_CLNT_HELLO_B; 714 /* number of bytes to write */ 715 s->init_num=p-buf; 716 s->init_off=0; 717 718 /* buffer the message to handle re-xmits */ 719 dtls1_buffer_message(s, 0); 720 } 721 722 /* SSL3_ST_CW_CLNT_HELLO_B */ 723 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 724 err: 725 return(-1); 726 } 727 728 static int dtls1_get_hello_verify(SSL *s) 729 { 730 int n, al, ok = 0; 731 unsigned char *data; 732 unsigned int cookie_len; 733 734 n=s->method->ssl_get_message(s, 735 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 736 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 737 -1, 738 s->max_cert_list, 739 &ok); 740 741 if (!ok) return((int)n); 742 743 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) 744 { 745 s->d1->send_cookie = 0; 746 s->s3->tmp.reuse_message=1; 747 return(1); 748 } 749 750 data = (unsigned char *)s->init_msg; 751 752 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff))) 753 { 754 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION); 755 s->version=(s->version&0xff00)|data[1]; 756 al = SSL_AD_PROTOCOL_VERSION; 757 goto f_err; 758 } 759 data+=2; 760 761 cookie_len = *(data++); 762 if ( cookie_len > sizeof(s->d1->cookie)) 763 { 764 al=SSL_AD_ILLEGAL_PARAMETER; 765 goto f_err; 766 } 767 768 memcpy(s->d1->cookie, data, cookie_len); 769 s->d1->cookie_len = cookie_len; 770 771 s->d1->send_cookie = 1; 772 return 1; 773 774 f_err: 775 ssl3_send_alert(s, SSL3_AL_FATAL, al); 776 return -1; 777 } 778 779 int dtls1_send_client_key_exchange(SSL *s) 780 { 781 unsigned char *p,*d; 782 int n; 783 unsigned long alg_k; 784 #ifndef OPENSSL_NO_RSA 785 unsigned char *q; 786 EVP_PKEY *pkey=NULL; 787 #endif 788 #ifndef OPENSSL_NO_KRB5 789 KSSL_ERR kssl_err; 790 #endif /* OPENSSL_NO_KRB5 */ 791 #ifndef OPENSSL_NO_ECDH 792 EC_KEY *clnt_ecdh = NULL; 793 const EC_POINT *srvr_ecpoint = NULL; 794 EVP_PKEY *srvr_pub_pkey = NULL; 795 unsigned char *encodedPoint = NULL; 796 int encoded_pt_len = 0; 797 BN_CTX * bn_ctx = NULL; 798 #endif 799 800 if (s->state == SSL3_ST_CW_KEY_EXCH_A) 801 { 802 d=(unsigned char *)s->init_buf->data; 803 p= &(d[DTLS1_HM_HEADER_LENGTH]); 804 805 alg_k=s->s3->tmp.new_cipher->algorithm_mkey; 806 807 /* Fool emacs indentation */ 808 if (0) {} 809 #ifndef OPENSSL_NO_RSA 810 else if (alg_k & SSL_kRSA) 811 { 812 RSA *rsa; 813 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 814 815 if (s->session->sess_cert->peer_rsa_tmp != NULL) 816 rsa=s->session->sess_cert->peer_rsa_tmp; 817 else 818 { 819 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 820 if ((pkey == NULL) || 821 (pkey->type != EVP_PKEY_RSA) || 822 (pkey->pkey.rsa == NULL)) 823 { 824 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 825 goto err; 826 } 827 rsa=pkey->pkey.rsa; 828 EVP_PKEY_free(pkey); 829 } 830 831 tmp_buf[0]=s->client_version>>8; 832 tmp_buf[1]=s->client_version&0xff; 833 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) 834 goto err; 835 836 s->session->master_key_length=sizeof tmp_buf; 837 838 q=p; 839 /* Fix buf for TLS and [incidentally] DTLS */ 840 if (s->version > SSL3_VERSION) 841 p+=2; 842 n=RSA_public_encrypt(sizeof tmp_buf, 843 tmp_buf,p,rsa,RSA_PKCS1_PADDING); 844 #ifdef PKCS1_CHECK 845 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++; 846 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70; 847 #endif 848 if (n <= 0) 849 { 850 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT); 851 goto err; 852 } 853 854 /* Fix buf for TLS and [incidentally] DTLS */ 855 if (s->version > SSL3_VERSION) 856 { 857 s2n(n,q); 858 n+=2; 859 } 860 861 s->session->master_key_length= 862 s->method->ssl3_enc->generate_master_secret(s, 863 s->session->master_key, 864 tmp_buf,sizeof tmp_buf); 865 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf); 866 } 867 #endif 868 #ifndef OPENSSL_NO_KRB5 869 else if (alg_k & SSL_kKRB5) 870 { 871 krb5_error_code krb5rc; 872 KSSL_CTX *kssl_ctx = s->kssl_ctx; 873 /* krb5_data krb5_ap_req; */ 874 krb5_data *enc_ticket; 875 krb5_data authenticator, *authp = NULL; 876 EVP_CIPHER_CTX ciph_ctx; 877 const EVP_CIPHER *enc = NULL; 878 unsigned char iv[EVP_MAX_IV_LENGTH]; 879 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 880 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH 881 + EVP_MAX_IV_LENGTH]; 882 int padl, outl = sizeof(epms); 883 884 EVP_CIPHER_CTX_init(&ciph_ctx); 885 886 #ifdef KSSL_DEBUG 887 printf("ssl3_send_client_key_exchange(%lx & %lx)\n", 888 alg_k, SSL_kKRB5); 889 #endif /* KSSL_DEBUG */ 890 891 authp = NULL; 892 #ifdef KRB5SENDAUTH 893 if (KRB5SENDAUTH) authp = &authenticator; 894 #endif /* KRB5SENDAUTH */ 895 896 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, 897 &kssl_err); 898 enc = kssl_map_enc(kssl_ctx->enctype); 899 if (enc == NULL) 900 goto err; 901 #ifdef KSSL_DEBUG 902 { 903 printf("kssl_cget_tkt rtn %d\n", krb5rc); 904 if (krb5rc && kssl_err.text) 905 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 906 } 907 #endif /* KSSL_DEBUG */ 908 909 if (krb5rc) 910 { 911 ssl3_send_alert(s,SSL3_AL_FATAL, 912 SSL_AD_HANDSHAKE_FAILURE); 913 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 914 kssl_err.reason); 915 goto err; 916 } 917 918 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ 919 ** in place of RFC 2712 KerberosWrapper, as in: 920 ** 921 ** Send ticket (copy to *p, set n = length) 922 ** n = krb5_ap_req.length; 923 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 924 ** if (krb5_ap_req.data) 925 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 926 ** 927 ** Now using real RFC 2712 KerberosWrapper 928 ** (Thanks to Simon Wilkinson <sxw (at) sxw.org.uk>) 929 ** Note: 2712 "opaque" types are here replaced 930 ** with a 2-byte length followed by the value. 931 ** Example: 932 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 933 ** Where "xx xx" = length bytes. Shown here with 934 ** optional authenticator omitted. 935 */ 936 937 /* KerberosWrapper.Ticket */ 938 s2n(enc_ticket->length,p); 939 memcpy(p, enc_ticket->data, enc_ticket->length); 940 p+= enc_ticket->length; 941 n = enc_ticket->length + 2; 942 943 /* KerberosWrapper.Authenticator */ 944 if (authp && authp->length) 945 { 946 s2n(authp->length,p); 947 memcpy(p, authp->data, authp->length); 948 p+= authp->length; 949 n+= authp->length + 2; 950 951 free(authp->data); 952 authp->data = NULL; 953 authp->length = 0; 954 } 955 else 956 { 957 s2n(0,p);/* null authenticator length */ 958 n+=2; 959 } 960 961 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0) 962 goto err; 963 964 /* 20010420 VRS. Tried it this way; failed. 965 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 966 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 967 ** kssl_ctx->length); 968 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 969 */ 970 971 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 972 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL, 973 kssl_ctx->key,iv); 974 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf, 975 sizeof tmp_buf); 976 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl); 977 outl += padl; 978 if (outl > (int)sizeof epms) 979 { 980 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 981 goto err; 982 } 983 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 984 985 /* KerberosWrapper.EncryptedPreMasterSecret */ 986 s2n(outl,p); 987 memcpy(p, epms, outl); 988 p+=outl; 989 n+=outl + 2; 990 991 s->session->master_key_length= 992 s->method->ssl3_enc->generate_master_secret(s, 993 s->session->master_key, 994 tmp_buf, sizeof tmp_buf); 995 996 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 997 OPENSSL_cleanse(epms, outl); 998 } 999 #endif 1000 #ifndef OPENSSL_NO_DH 1001 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 1002 { 1003 DH *dh_srvr,*dh_clnt; 1004 1005 if (s->session->sess_cert->peer_dh_tmp != NULL) 1006 dh_srvr=s->session->sess_cert->peer_dh_tmp; 1007 else 1008 { 1009 /* we get them from the cert */ 1010 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1011 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1012 goto err; 1013 } 1014 1015 /* generate a new random key */ 1016 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL) 1017 { 1018 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1019 goto err; 1020 } 1021 if (!DH_generate_key(dh_clnt)) 1022 { 1023 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1024 goto err; 1025 } 1026 1027 /* use the 'p' output buffer for the DH key, but 1028 * make sure to clear it out afterwards */ 1029 1030 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt); 1031 1032 if (n <= 0) 1033 { 1034 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1035 goto err; 1036 } 1037 1038 /* generate master key from the result */ 1039 s->session->master_key_length= 1040 s->method->ssl3_enc->generate_master_secret(s, 1041 s->session->master_key,p,n); 1042 /* clean up */ 1043 memset(p,0,n); 1044 1045 /* send off the data */ 1046 n=BN_num_bytes(dh_clnt->pub_key); 1047 s2n(n,p); 1048 BN_bn2bin(dh_clnt->pub_key,p); 1049 n+=2; 1050 1051 DH_free(dh_clnt); 1052 1053 /* perhaps clean things up a bit EAY EAY EAY EAY*/ 1054 } 1055 #endif 1056 #ifndef OPENSSL_NO_ECDH 1057 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) 1058 { 1059 const EC_GROUP *srvr_group = NULL; 1060 EC_KEY *tkey; 1061 int ecdh_clnt_cert = 0; 1062 int field_size = 0; 1063 1064 /* Did we send out the client's 1065 * ECDH share for use in premaster 1066 * computation as part of client certificate? 1067 * If so, set ecdh_clnt_cert to 1. 1068 */ 1069 if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 1070 { 1071 /* XXX: For now, we do not support client 1072 * authentication using ECDH certificates. 1073 * To add such support, one needs to add 1074 * code that checks for appropriate 1075 * conditions and sets ecdh_clnt_cert to 1. 1076 * For example, the cert have an ECC 1077 * key on the same curve as the server's 1078 * and the key should be authorized for 1079 * key agreement. 1080 * 1081 * One also needs to add code in ssl3_connect 1082 * to skip sending the certificate verify 1083 * message. 1084 * 1085 * if ((s->cert->key->privatekey != NULL) && 1086 * (s->cert->key->privatekey->type == 1087 * EVP_PKEY_EC) && ...) 1088 * ecdh_clnt_cert = 1; 1089 */ 1090 } 1091 1092 if (s->session->sess_cert->peer_ecdh_tmp != NULL) 1093 { 1094 tkey = s->session->sess_cert->peer_ecdh_tmp; 1095 } 1096 else 1097 { 1098 /* Get the Server Public Key from Cert */ 1099 srvr_pub_pkey = X509_get_pubkey(s->session-> \ 1100 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1101 if ((srvr_pub_pkey == NULL) || 1102 (srvr_pub_pkey->type != EVP_PKEY_EC) || 1103 (srvr_pub_pkey->pkey.ec == NULL)) 1104 { 1105 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1106 ERR_R_INTERNAL_ERROR); 1107 goto err; 1108 } 1109 1110 tkey = srvr_pub_pkey->pkey.ec; 1111 } 1112 1113 srvr_group = EC_KEY_get0_group(tkey); 1114 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 1115 1116 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) 1117 { 1118 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1119 ERR_R_INTERNAL_ERROR); 1120 goto err; 1121 } 1122 1123 if ((clnt_ecdh=EC_KEY_new()) == NULL) 1124 { 1125 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1126 goto err; 1127 } 1128 1129 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) 1130 { 1131 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1132 goto err; 1133 } 1134 if (ecdh_clnt_cert) 1135 { 1136 /* Reuse key info from our certificate 1137 * We only need our private key to perform 1138 * the ECDH computation. 1139 */ 1140 const BIGNUM *priv_key; 1141 tkey = s->cert->key->privatekey->pkey.ec; 1142 priv_key = EC_KEY_get0_private_key(tkey); 1143 if (priv_key == NULL) 1144 { 1145 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1146 goto err; 1147 } 1148 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) 1149 { 1150 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1151 goto err; 1152 } 1153 } 1154 else 1155 { 1156 /* Generate a new ECDH key pair */ 1157 if (!(EC_KEY_generate_key(clnt_ecdh))) 1158 { 1159 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1160 goto err; 1161 } 1162 } 1163 1164 /* use the 'p' output buffer for the ECDH key, but 1165 * make sure to clear it out afterwards 1166 */ 1167 1168 field_size = EC_GROUP_get_degree(srvr_group); 1169 if (field_size <= 0) 1170 { 1171 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1172 ERR_R_ECDH_LIB); 1173 goto err; 1174 } 1175 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL); 1176 if (n <= 0) 1177 { 1178 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1179 ERR_R_ECDH_LIB); 1180 goto err; 1181 } 1182 1183 /* generate master key from the result */ 1184 s->session->master_key_length = s->method->ssl3_enc \ 1185 -> generate_master_secret(s, 1186 s->session->master_key, 1187 p, n); 1188 1189 memset(p, 0, n); /* clean up */ 1190 1191 if (ecdh_clnt_cert) 1192 { 1193 /* Send empty client key exch message */ 1194 n = 0; 1195 } 1196 else 1197 { 1198 /* First check the size of encoding and 1199 * allocate memory accordingly. 1200 */ 1201 encoded_pt_len = 1202 EC_POINT_point2oct(srvr_group, 1203 EC_KEY_get0_public_key(clnt_ecdh), 1204 POINT_CONVERSION_UNCOMPRESSED, 1205 NULL, 0, NULL); 1206 1207 encodedPoint = (unsigned char *) 1208 OPENSSL_malloc(encoded_pt_len * 1209 sizeof(unsigned char)); 1210 bn_ctx = BN_CTX_new(); 1211 if ((encodedPoint == NULL) || 1212 (bn_ctx == NULL)) 1213 { 1214 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1215 goto err; 1216 } 1217 1218 /* Encode the public key */ 1219 n = EC_POINT_point2oct(srvr_group, 1220 EC_KEY_get0_public_key(clnt_ecdh), 1221 POINT_CONVERSION_UNCOMPRESSED, 1222 encodedPoint, encoded_pt_len, bn_ctx); 1223 1224 *p = n; /* length of encoded point */ 1225 /* Encoded point will be copied here */ 1226 p += 1; 1227 /* copy the point */ 1228 memcpy((unsigned char *)p, encodedPoint, n); 1229 /* increment n to account for length field */ 1230 n += 1; 1231 } 1232 1233 /* Free allocated memory */ 1234 BN_CTX_free(bn_ctx); 1235 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1236 if (clnt_ecdh != NULL) 1237 EC_KEY_free(clnt_ecdh); 1238 EVP_PKEY_free(srvr_pub_pkey); 1239 } 1240 #endif /* !OPENSSL_NO_ECDH */ 1241 1242 #ifndef OPENSSL_NO_PSK 1243 else if (alg_k & SSL_kPSK) 1244 { 1245 char identity[PSK_MAX_IDENTITY_LEN]; 1246 unsigned char *t = NULL; 1247 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4]; 1248 unsigned int pre_ms_len = 0, psk_len = 0; 1249 int psk_err = 1; 1250 1251 n = 0; 1252 if (s->psk_client_callback == NULL) 1253 { 1254 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1255 SSL_R_PSK_NO_CLIENT_CB); 1256 goto err; 1257 } 1258 1259 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint, 1260 identity, PSK_MAX_IDENTITY_LEN, 1261 psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1262 if (psk_len > PSK_MAX_PSK_LEN) 1263 { 1264 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1265 ERR_R_INTERNAL_ERROR); 1266 goto psk_err; 1267 } 1268 else if (psk_len == 0) 1269 { 1270 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1271 SSL_R_PSK_IDENTITY_NOT_FOUND); 1272 goto psk_err; 1273 } 1274 1275 /* create PSK pre_master_secret */ 1276 pre_ms_len = 2+psk_len+2+psk_len; 1277 t = psk_or_pre_ms; 1278 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len); 1279 s2n(psk_len, t); 1280 memset(t, 0, psk_len); 1281 t+=psk_len; 1282 s2n(psk_len, t); 1283 1284 if (s->session->psk_identity_hint != NULL) 1285 OPENSSL_free(s->session->psk_identity_hint); 1286 s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint); 1287 if (s->ctx->psk_identity_hint != NULL && 1288 s->session->psk_identity_hint == NULL) 1289 { 1290 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1291 ERR_R_MALLOC_FAILURE); 1292 goto psk_err; 1293 } 1294 1295 if (s->session->psk_identity != NULL) 1296 OPENSSL_free(s->session->psk_identity); 1297 s->session->psk_identity = BUF_strdup(identity); 1298 if (s->session->psk_identity == NULL) 1299 { 1300 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1301 ERR_R_MALLOC_FAILURE); 1302 goto psk_err; 1303 } 1304 1305 s->session->master_key_length = 1306 s->method->ssl3_enc->generate_master_secret(s, 1307 s->session->master_key, 1308 psk_or_pre_ms, pre_ms_len); 1309 n = strlen(identity); 1310 s2n(n, p); 1311 memcpy(p, identity, n); 1312 n+=2; 1313 psk_err = 0; 1314 psk_err: 1315 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN); 1316 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1317 if (psk_err != 0) 1318 { 1319 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1320 goto err; 1321 } 1322 } 1323 #endif 1324 else 1325 { 1326 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1327 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1328 goto err; 1329 } 1330 1331 d = dtls1_set_message_header(s, d, 1332 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); 1333 /* 1334 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 1335 l2n3(n,d); 1336 l2n(s->d1->handshake_write_seq,d); 1337 s->d1->handshake_write_seq++; 1338 */ 1339 1340 s->state=SSL3_ST_CW_KEY_EXCH_B; 1341 /* number of bytes to write */ 1342 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1343 s->init_off=0; 1344 1345 /* buffer the message to handle re-xmits */ 1346 dtls1_buffer_message(s, 0); 1347 } 1348 1349 /* SSL3_ST_CW_KEY_EXCH_B */ 1350 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1351 err: 1352 #ifndef OPENSSL_NO_ECDH 1353 BN_CTX_free(bn_ctx); 1354 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1355 if (clnt_ecdh != NULL) 1356 EC_KEY_free(clnt_ecdh); 1357 EVP_PKEY_free(srvr_pub_pkey); 1358 #endif 1359 return(-1); 1360 } 1361 1362 int dtls1_send_client_verify(SSL *s) 1363 { 1364 unsigned char *p,*d; 1365 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1366 EVP_PKEY *pkey; 1367 #ifndef OPENSSL_NO_RSA 1368 unsigned u=0; 1369 #endif 1370 unsigned long n; 1371 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA) 1372 int j; 1373 #endif 1374 1375 if (s->state == SSL3_ST_CW_CERT_VRFY_A) 1376 { 1377 d=(unsigned char *)s->init_buf->data; 1378 p= &(d[DTLS1_HM_HEADER_LENGTH]); 1379 pkey=s->cert->key->privatekey; 1380 1381 s->method->ssl3_enc->cert_verify_mac(s, 1382 NID_sha1, 1383 &(data[MD5_DIGEST_LENGTH])); 1384 1385 #ifndef OPENSSL_NO_RSA 1386 if (pkey->type == EVP_PKEY_RSA) 1387 { 1388 s->method->ssl3_enc->cert_verify_mac(s, 1389 NID_md5, 1390 &(data[0])); 1391 if (RSA_sign(NID_md5_sha1, data, 1392 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, 1393 &(p[2]), &u, pkey->pkey.rsa) <= 0 ) 1394 { 1395 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB); 1396 goto err; 1397 } 1398 s2n(u,p); 1399 n=u+2; 1400 } 1401 else 1402 #endif 1403 #ifndef OPENSSL_NO_DSA 1404 if (pkey->type == EVP_PKEY_DSA) 1405 { 1406 if (!DSA_sign(pkey->save_type, 1407 &(data[MD5_DIGEST_LENGTH]), 1408 SHA_DIGEST_LENGTH,&(p[2]), 1409 (unsigned int *)&j,pkey->pkey.dsa)) 1410 { 1411 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB); 1412 goto err; 1413 } 1414 s2n(j,p); 1415 n=j+2; 1416 } 1417 else 1418 #endif 1419 #ifndef OPENSSL_NO_ECDSA 1420 if (pkey->type == EVP_PKEY_EC) 1421 { 1422 if (!ECDSA_sign(pkey->save_type, 1423 &(data[MD5_DIGEST_LENGTH]), 1424 SHA_DIGEST_LENGTH,&(p[2]), 1425 (unsigned int *)&j,pkey->pkey.ec)) 1426 { 1427 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, 1428 ERR_R_ECDSA_LIB); 1429 goto err; 1430 } 1431 s2n(j,p); 1432 n=j+2; 1433 } 1434 else 1435 #endif 1436 { 1437 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR); 1438 goto err; 1439 } 1440 1441 d = dtls1_set_message_header(s, d, 1442 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ; 1443 1444 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH; 1445 s->init_off=0; 1446 1447 /* buffer the message to handle re-xmits */ 1448 dtls1_buffer_message(s, 0); 1449 1450 s->state = SSL3_ST_CW_CERT_VRFY_B; 1451 } 1452 1453 /* s->state = SSL3_ST_CW_CERT_VRFY_B */ 1454 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1455 err: 1456 return(-1); 1457 } 1458 1459 int dtls1_send_client_certificate(SSL *s) 1460 { 1461 X509 *x509=NULL; 1462 EVP_PKEY *pkey=NULL; 1463 int i; 1464 unsigned long l; 1465 1466 if (s->state == SSL3_ST_CW_CERT_A) 1467 { 1468 if ((s->cert == NULL) || 1469 (s->cert->key->x509 == NULL) || 1470 (s->cert->key->privatekey == NULL)) 1471 s->state=SSL3_ST_CW_CERT_B; 1472 else 1473 s->state=SSL3_ST_CW_CERT_C; 1474 } 1475 1476 /* We need to get a client cert */ 1477 if (s->state == SSL3_ST_CW_CERT_B) 1478 { 1479 /* If we get an error, we need to 1480 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 1481 * We then get retied later */ 1482 i=0; 1483 i = ssl_do_client_cert_cb(s, &x509, &pkey); 1484 if (i < 0) 1485 { 1486 s->rwstate=SSL_X509_LOOKUP; 1487 return(-1); 1488 } 1489 s->rwstate=SSL_NOTHING; 1490 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) 1491 { 1492 s->state=SSL3_ST_CW_CERT_B; 1493 if ( !SSL_use_certificate(s,x509) || 1494 !SSL_use_PrivateKey(s,pkey)) 1495 i=0; 1496 } 1497 else if (i == 1) 1498 { 1499 i=0; 1500 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 1501 } 1502 1503 if (x509 != NULL) X509_free(x509); 1504 if (pkey != NULL) EVP_PKEY_free(pkey); 1505 if (i == 0) 1506 { 1507 if (s->version == SSL3_VERSION) 1508 { 1509 s->s3->tmp.cert_req=0; 1510 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE); 1511 return(1); 1512 } 1513 else 1514 { 1515 s->s3->tmp.cert_req=2; 1516 } 1517 } 1518 1519 /* Ok, we have a cert */ 1520 s->state=SSL3_ST_CW_CERT_C; 1521 } 1522 1523 if (s->state == SSL3_ST_CW_CERT_C) 1524 { 1525 s->state=SSL3_ST_CW_CERT_D; 1526 l=dtls1_output_cert_chain(s, 1527 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509); 1528 s->init_num=(int)l; 1529 s->init_off=0; 1530 1531 /* set header called by dtls1_output_cert_chain() */ 1532 1533 /* buffer the message to handle re-xmits */ 1534 dtls1_buffer_message(s, 0); 1535 } 1536 /* SSL3_ST_CW_CERT_D */ 1537 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1538 } 1539 1540 1541
