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 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 } 588 end: 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 } 596 597 int 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 (!s->session_creation_enabled) 619 { 620 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 621 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_SESSION_MAY_NOT_BE_CREATED); 622 goto err; 623 } 624 if (!ssl_get_new_session(s,0)) 625 goto err; 626 } 627 /* else use the pre-loaded session */ 628 629 p=s->s3->client_random; 630 631 /* if client_random is initialized, reuse it, we are 632 * required to use same upon reply to HelloVerify */ 633 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ; 634 if (i==sizeof(s->s3->client_random)) 635 { 636 Time=(unsigned long)time(NULL); /* Time */ 637 l2n(Time,p); 638 RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4); 639 } 640 641 /* Do the message type and length last */ 642 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 643 644 *(p++)=s->version>>8; 645 *(p++)=s->version&0xff; 646 s->client_version=s->version; 647 648 /* Random stuff */ 649 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 650 p+=SSL3_RANDOM_SIZE; 651 652 /* Session ID */ 653 if (s->new_session) 654 i=0; 655 else 656 i=s->session->session_id_length; 657 *(p++)=i; 658 if (i != 0) 659 { 660 if (i > sizeof s->session->session_id) 661 { 662 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 663 goto err; 664 } 665 memcpy(p,s->session->session_id,i); 666 p+=i; 667 } 668 669 /* cookie stuff */ 670 if ( s->d1->cookie_len > sizeof(s->d1->cookie)) 671 { 672 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 673 goto err; 674 } 675 *(p++) = s->d1->cookie_len; 676 memcpy(p, s->d1->cookie, s->d1->cookie_len); 677 p += s->d1->cookie_len; 678 679 /* Ciphers supported */ 680 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0); 681 if (i == 0) 682 { 683 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 684 goto err; 685 } 686 s2n(i,p); 687 p+=i; 688 689 /* COMPRESSION */ 690 if (s->ctx->comp_methods == NULL) 691 j=0; 692 else 693 j=sk_SSL_COMP_num(s->ctx->comp_methods); 694 *(p++)=1+j; 695 for (i=0; i<j; i++) 696 { 697 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 698 *(p++)=comp->id; 699 } 700 *(p++)=0; /* Add the NULL method */ 701 702 #ifndef OPENSSL_NO_TLSEXT 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)); 726 err: 727 return(-1); 728 } 729 730 static 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; 775 776 f_err: 777 ssl3_send_alert(s, SSL3_AL_FATAL, al); 778 return -1; 779 } 780 781 int 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->peer_rsa_tmp != NULL) 818 rsa=s->session->sess_cert->peer_rsa_tmp; 819 else 820 { 821 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 822 if ((pkey == NULL) || 823 (pkey->type != EVP_PKEY_RSA) || 824 (pkey->pkey.rsa == NULL)) 825 { 826 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 827 goto err; 828 } 829 rsa=pkey->pkey.rsa; 830 EVP_PKEY_free(pkey); 831 } 832 833 tmp_buf[0]=s->client_version>>8; 834 tmp_buf[1]=s->client_version&0xff; 835 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) 836 goto err; 837 838 s->session->master_key_length=sizeof tmp_buf; 839 840 q=p; 841 /* Fix buf for TLS and [incidentally] DTLS */ 842 if (s->version > SSL3_VERSION) 843 p+=2; 844 n=RSA_public_encrypt(sizeof tmp_buf, 845 tmp_buf,p,rsa,RSA_PKCS1_PADDING); 846 #ifdef PKCS1_CHECK 847 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++; 848 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70; 849 #endif 850 if (n <= 0) 851 { 852 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT); 853 goto err; 854 } 855 856 /* Fix buf for TLS and [incidentally] DTLS */ 857 if (s->version > SSL3_VERSION) 858 { 859 s2n(n,q); 860 n+=2; 861 } 862 863 s->session->master_key_length= 864 s->method->ssl3_enc->generate_master_secret(s, 865 s->session->master_key, 866 tmp_buf,sizeof tmp_buf); 867 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf); 868 } 869 #endif 870 #ifndef OPENSSL_NO_KRB5 871 else if (alg_k & SSL_kKRB5) 872 { 873 krb5_error_code krb5rc; 874 KSSL_CTX *kssl_ctx = s->kssl_ctx; 875 /* krb5_data krb5_ap_req; */ 876 krb5_data *enc_ticket; 877 krb5_data authenticator, *authp = NULL; 878 EVP_CIPHER_CTX ciph_ctx; 879 const EVP_CIPHER *enc = NULL; 880 unsigned char iv[EVP_MAX_IV_LENGTH]; 881 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 882 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH 883 + EVP_MAX_IV_LENGTH]; 884 int padl, outl = sizeof(epms); 885 886 EVP_CIPHER_CTX_init(&ciph_ctx); 887 888 #ifdef KSSL_DEBUG 889 printf("ssl3_send_client_key_exchange(%lx & %lx)\n", 890 alg_k, SSL_kKRB5); 891 #endif /* KSSL_DEBUG */ 892 893 authp = NULL; 894 #ifdef KRB5SENDAUTH 895 if (KRB5SENDAUTH) authp = &authenticator; 896 #endif /* KRB5SENDAUTH */ 897 898 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, 899 &kssl_err); 900 enc = kssl_map_enc(kssl_ctx->enctype); 901 if (enc == NULL) 902 goto err; 903 #ifdef KSSL_DEBUG 904 { 905 printf("kssl_cget_tkt rtn %d\n", krb5rc); 906 if (krb5rc && kssl_err.text) 907 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 908 } 909 #endif /* KSSL_DEBUG */ 910 911 if (krb5rc) 912 { 913 ssl3_send_alert(s,SSL3_AL_FATAL, 914 SSL_AD_HANDSHAKE_FAILURE); 915 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 916 kssl_err.reason); 917 goto err; 918 } 919 920 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ 921 ** in place of RFC 2712 KerberosWrapper, as in: 922 ** 923 ** Send ticket (copy to *p, set n = length) 924 ** n = krb5_ap_req.length; 925 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 926 ** if (krb5_ap_req.data) 927 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 928 ** 929 ** Now using real RFC 2712 KerberosWrapper 930 ** (Thanks to Simon Wilkinson <sxw (at) sxw.org.uk>) 931 ** Note: 2712 "opaque" types are here replaced 932 ** with a 2-byte length followed by the value. 933 ** Example: 934 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 935 ** Where "xx xx" = length bytes. Shown here with 936 ** optional authenticator omitted. 937 */ 938 939 /* KerberosWrapper.Ticket */ 940 s2n(enc_ticket->length,p); 941 memcpy(p, enc_ticket->data, enc_ticket->length); 942 p+= enc_ticket->length; 943 n = enc_ticket->length + 2; 944 945 /* KerberosWrapper.Authenticator */ 946 if (authp && authp->length) 947 { 948 s2n(authp->length,p); 949 memcpy(p, authp->data, authp->length); 950 p+= authp->length; 951 n+= authp->length + 2; 952 953 free(authp->data); 954 authp->data = NULL; 955 authp->length = 0; 956 } 957 else 958 { 959 s2n(0,p);/* null authenticator length */ 960 n+=2; 961 } 962 963 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0) 964 goto err; 965 966 /* 20010420 VRS. Tried it this way; failed. 967 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 968 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 969 ** kssl_ctx->length); 970 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 971 */ 972 973 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 974 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL, 975 kssl_ctx->key,iv); 976 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf, 977 sizeof tmp_buf); 978 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl); 979 outl += padl; 980 if (outl > (int)sizeof epms) 981 { 982 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 983 goto err; 984 } 985 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 986 987 /* KerberosWrapper.EncryptedPreMasterSecret */ 988 s2n(outl,p); 989 memcpy(p, epms, outl); 990 p+=outl; 991 n+=outl + 2; 992 993 s->session->master_key_length= 994 s->method->ssl3_enc->generate_master_secret(s, 995 s->session->master_key, 996 tmp_buf, sizeof tmp_buf); 997 998 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 999 OPENSSL_cleanse(epms, outl); 1000 } 1001 #endif 1002 #ifndef OPENSSL_NO_DH 1003 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 1004 { 1005 DH *dh_srvr,*dh_clnt; 1006 1007 if (s->session->sess_cert->peer_dh_tmp != NULL) 1008 dh_srvr=s->session->sess_cert->peer_dh_tmp; 1009 else 1010 { 1011 /* we get them from the cert */ 1012 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1013 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1014 goto err; 1015 } 1016 1017 /* generate a new random key */ 1018 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL) 1019 { 1020 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1021 goto err; 1022 } 1023 if (!DH_generate_key(dh_clnt)) 1024 { 1025 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1026 goto err; 1027 } 1028 1029 /* use the 'p' output buffer for the DH key, but 1030 * make sure to clear it out afterwards */ 1031 1032 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt); 1033 1034 if (n <= 0) 1035 { 1036 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1037 goto err; 1038 } 1039 1040 /* generate master key from the result */ 1041 s->session->master_key_length= 1042 s->method->ssl3_enc->generate_master_secret(s, 1043 s->session->master_key,p,n); 1044 /* clean up */ 1045 memset(p,0,n); 1046 1047 /* send off the data */ 1048 n=BN_num_bytes(dh_clnt->pub_key); 1049 s2n(n,p); 1050 BN_bn2bin(dh_clnt->pub_key,p); 1051 n+=2; 1052 1053 DH_free(dh_clnt); 1054 1055 /* perhaps clean things up a bit EAY EAY EAY EAY*/ 1056 } 1057 #endif 1058 #ifndef OPENSSL_NO_ECDH 1059 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) 1060 { 1061 const EC_GROUP *srvr_group = NULL; 1062 EC_KEY *tkey; 1063 int ecdh_clnt_cert = 0; 1064 int field_size = 0; 1065 1066 /* Did we send out the client's 1067 * ECDH share for use in premaster 1068 * computation as part of client certificate? 1069 * If so, set ecdh_clnt_cert to 1. 1070 */ 1071 if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 1072 { 1073 /* XXX: For now, we do not support client 1074 * authentication using ECDH certificates. 1075 * To add such support, one needs to add 1076 * code that checks for appropriate 1077 * conditions and sets ecdh_clnt_cert to 1. 1078 * For example, the cert have an ECC 1079 * key on the same curve as the server's 1080 * and the key should be authorized for 1081 * key agreement. 1082 * 1083 * One also needs to add code in ssl3_connect 1084 * to skip sending the certificate verify 1085 * message. 1086 * 1087 * if ((s->cert->key->privatekey != NULL) && 1088 * (s->cert->key->privatekey->type == 1089 * EVP_PKEY_EC) && ...) 1090 * ecdh_clnt_cert = 1; 1091 */ 1092 } 1093 1094 if (s->session->sess_cert->peer_ecdh_tmp != NULL) 1095 { 1096 tkey = s->session->sess_cert->peer_ecdh_tmp; 1097 } 1098 else 1099 { 1100 /* Get the Server Public Key from Cert */ 1101 srvr_pub_pkey = X509_get_pubkey(s->session-> \ 1102 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1103 if ((srvr_pub_pkey == NULL) || 1104 (srvr_pub_pkey->type != EVP_PKEY_EC) || 1105 (srvr_pub_pkey->pkey.ec == NULL)) 1106 { 1107 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1108 ERR_R_INTERNAL_ERROR); 1109 goto err; 1110 } 1111 1112 tkey = srvr_pub_pkey->pkey.ec; 1113 } 1114 1115 srvr_group = EC_KEY_get0_group(tkey); 1116 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 1117 1118 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) 1119 { 1120 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1121 ERR_R_INTERNAL_ERROR); 1122 goto err; 1123 } 1124 1125 if ((clnt_ecdh=EC_KEY_new()) == NULL) 1126 { 1127 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1128 goto err; 1129 } 1130 1131 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) 1132 { 1133 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1134 goto err; 1135 } 1136 if (ecdh_clnt_cert) 1137 { 1138 /* Reuse key info from our certificate 1139 * We only need our private key to perform 1140 * the ECDH computation. 1141 */ 1142 const BIGNUM *priv_key; 1143 tkey = s->cert->key->privatekey->pkey.ec; 1144 priv_key = EC_KEY_get0_private_key(tkey); 1145 if (priv_key == NULL) 1146 { 1147 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1148 goto err; 1149 } 1150 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) 1151 { 1152 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1153 goto err; 1154 } 1155 } 1156 else 1157 { 1158 /* Generate a new ECDH key pair */ 1159 if (!(EC_KEY_generate_key(clnt_ecdh))) 1160 { 1161 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1162 goto err; 1163 } 1164 } 1165 1166 /* use the 'p' output buffer for the ECDH key, but 1167 * make sure to clear it out afterwards 1168 */ 1169 1170 field_size = EC_GROUP_get_degree(srvr_group); 1171 if (field_size <= 0) 1172 { 1173 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1174 ERR_R_ECDH_LIB); 1175 goto err; 1176 } 1177 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL); 1178 if (n <= 0) 1179 { 1180 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1181 ERR_R_ECDH_LIB); 1182 goto err; 1183 } 1184 1185 /* generate master key from the result */ 1186 s->session->master_key_length = s->method->ssl3_enc \ 1187 -> generate_master_secret(s, 1188 s->session->master_key, 1189 p, n); 1190 1191 memset(p, 0, n); /* clean up */ 1192 1193 if (ecdh_clnt_cert) 1194 { 1195 /* Send empty client key exch message */ 1196 n = 0; 1197 } 1198 else 1199 { 1200 /* First check the size of encoding and 1201 * allocate memory accordingly. 1202 */ 1203 encoded_pt_len = 1204 EC_POINT_point2oct(srvr_group, 1205 EC_KEY_get0_public_key(clnt_ecdh), 1206 POINT_CONVERSION_UNCOMPRESSED, 1207 NULL, 0, NULL); 1208 1209 encodedPoint = (unsigned char *) 1210 OPENSSL_malloc(encoded_pt_len * 1211 sizeof(unsigned char)); 1212 bn_ctx = BN_CTX_new(); 1213 if ((encodedPoint == NULL) || 1214 (bn_ctx == NULL)) 1215 { 1216 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1217 goto err; 1218 } 1219 1220 /* Encode the public key */ 1221 n = EC_POINT_point2oct(srvr_group, 1222 EC_KEY_get0_public_key(clnt_ecdh), 1223 POINT_CONVERSION_UNCOMPRESSED, 1224 encodedPoint, encoded_pt_len, bn_ctx); 1225 1226 *p = n; /* length of encoded point */ 1227 /* Encoded point will be copied here */ 1228 p += 1; 1229 /* copy the point */ 1230 memcpy((unsigned char *)p, encodedPoint, n); 1231 /* increment n to account for length field */ 1232 n += 1; 1233 } 1234 1235 /* Free allocated memory */ 1236 BN_CTX_free(bn_ctx); 1237 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1238 if (clnt_ecdh != NULL) 1239 EC_KEY_free(clnt_ecdh); 1240 EVP_PKEY_free(srvr_pub_pkey); 1241 } 1242 #endif /* !OPENSSL_NO_ECDH */ 1243 1244 #ifndef OPENSSL_NO_PSK 1245 else if (alg_k & SSL_kPSK) 1246 { 1247 char identity[PSK_MAX_IDENTITY_LEN]; 1248 unsigned char *t = NULL; 1249 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4]; 1250 unsigned int pre_ms_len = 0, psk_len = 0; 1251 int psk_err = 1; 1252 1253 n = 0; 1254 if (s->psk_client_callback == NULL) 1255 { 1256 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1257 SSL_R_PSK_NO_CLIENT_CB); 1258 goto err; 1259 } 1260 1261 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint, 1262 identity, PSK_MAX_IDENTITY_LEN, 1263 psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1264 if (psk_len > PSK_MAX_PSK_LEN) 1265 { 1266 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1267 ERR_R_INTERNAL_ERROR); 1268 goto psk_err; 1269 } 1270 else if (psk_len == 0) 1271 { 1272 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1273 SSL_R_PSK_IDENTITY_NOT_FOUND); 1274 goto psk_err; 1275 } 1276 1277 /* create PSK pre_master_secret */ 1278 pre_ms_len = 2+psk_len+2+psk_len; 1279 t = psk_or_pre_ms; 1280 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len); 1281 s2n(psk_len, t); 1282 memset(t, 0, psk_len); 1283 t+=psk_len; 1284 s2n(psk_len, t); 1285 1286 if (s->session->psk_identity_hint != NULL) 1287 OPENSSL_free(s->session->psk_identity_hint); 1288 s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint); 1289 if (s->ctx->psk_identity_hint != NULL && 1290 s->session->psk_identity_hint == NULL) 1291 { 1292 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1293 ERR_R_MALLOC_FAILURE); 1294 goto psk_err; 1295 } 1296 1297 if (s->session->psk_identity != NULL) 1298 OPENSSL_free(s->session->psk_identity); 1299 s->session->psk_identity = BUF_strdup(identity); 1300 if (s->session->psk_identity == NULL) 1301 { 1302 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1303 ERR_R_MALLOC_FAILURE); 1304 goto psk_err; 1305 } 1306 1307 s->session->master_key_length = 1308 s->method->ssl3_enc->generate_master_secret(s, 1309 s->session->master_key, 1310 psk_or_pre_ms, pre_ms_len); 1311 n = strlen(identity); 1312 s2n(n, p); 1313 memcpy(p, identity, n); 1314 n+=2; 1315 psk_err = 0; 1316 psk_err: 1317 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN); 1318 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1319 if (psk_err != 0) 1320 { 1321 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1322 goto err; 1323 } 1324 } 1325 #endif 1326 else 1327 { 1328 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1329 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1330 goto err; 1331 } 1332 1333 d = dtls1_set_message_header(s, d, 1334 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); 1335 /* 1336 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 1337 l2n3(n,d); 1338 l2n(s->d1->handshake_write_seq,d); 1339 s->d1->handshake_write_seq++; 1340 */ 1341 1342 s->state=SSL3_ST_CW_KEY_EXCH_B; 1343 /* number of bytes to write */ 1344 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1345 s->init_off=0; 1346 1347 /* buffer the message to handle re-xmits */ 1348 dtls1_buffer_message(s, 0); 1349 } 1350 1351 /* SSL3_ST_CW_KEY_EXCH_B */ 1352 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1353 err: 1354 #ifndef OPENSSL_NO_ECDH 1355 BN_CTX_free(bn_ctx); 1356 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1357 if (clnt_ecdh != NULL) 1358 EC_KEY_free(clnt_ecdh); 1359 EVP_PKEY_free(srvr_pub_pkey); 1360 #endif 1361 return(-1); 1362 } 1363 1364 int dtls1_send_client_verify(SSL *s) 1365 { 1366 unsigned char *p,*d; 1367 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1368 EVP_PKEY *pkey; 1369 #ifndef OPENSSL_NO_RSA 1370 unsigned u=0; 1371 #endif 1372 unsigned long n; 1373 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA) 1374 int j; 1375 #endif 1376 1377 if (s->state == SSL3_ST_CW_CERT_VRFY_A) 1378 { 1379 d=(unsigned char *)s->init_buf->data; 1380 p= &(d[DTLS1_HM_HEADER_LENGTH]); 1381 pkey=s->cert->key->privatekey; 1382 1383 s->method->ssl3_enc->cert_verify_mac(s, 1384 NID_sha1, 1385 &(data[MD5_DIGEST_LENGTH])); 1386 1387 #ifndef OPENSSL_NO_RSA 1388 if (pkey->type == EVP_PKEY_RSA) 1389 { 1390 s->method->ssl3_enc->cert_verify_mac(s, 1391 NID_md5, 1392 &(data[0])); 1393 if (RSA_sign(NID_md5_sha1, data, 1394 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, 1395 &(p[2]), &u, pkey->pkey.rsa) <= 0 ) 1396 { 1397 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB); 1398 goto err; 1399 } 1400 s2n(u,p); 1401 n=u+2; 1402 } 1403 else 1404 #endif 1405 #ifndef OPENSSL_NO_DSA 1406 if (pkey->type == EVP_PKEY_DSA) 1407 { 1408 if (!DSA_sign(pkey->save_type, 1409 &(data[MD5_DIGEST_LENGTH]), 1410 SHA_DIGEST_LENGTH,&(p[2]), 1411 (unsigned int *)&j,pkey->pkey.dsa)) 1412 { 1413 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB); 1414 goto err; 1415 } 1416 s2n(j,p); 1417 n=j+2; 1418 } 1419 else 1420 #endif 1421 #ifndef OPENSSL_NO_ECDSA 1422 if (pkey->type == EVP_PKEY_EC) 1423 { 1424 if (!ECDSA_sign(pkey->save_type, 1425 &(data[MD5_DIGEST_LENGTH]), 1426 SHA_DIGEST_LENGTH,&(p[2]), 1427 (unsigned int *)&j,pkey->pkey.ec)) 1428 { 1429 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, 1430 ERR_R_ECDSA_LIB); 1431 goto err; 1432 } 1433 s2n(j,p); 1434 n=j+2; 1435 } 1436 else 1437 #endif 1438 { 1439 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR); 1440 goto err; 1441 } 1442 1443 d = dtls1_set_message_header(s, d, 1444 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ; 1445 1446 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH; 1447 s->init_off=0; 1448 1449 /* buffer the message to handle re-xmits */ 1450 dtls1_buffer_message(s, 0); 1451 1452 s->state = SSL3_ST_CW_CERT_VRFY_B; 1453 } 1454 1455 /* s->state = SSL3_ST_CW_CERT_VRFY_B */ 1456 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1457 err: 1458 return(-1); 1459 } 1460 1461 int dtls1_send_client_certificate(SSL *s) 1462 { 1463 X509 *x509=NULL; 1464 EVP_PKEY *pkey=NULL; 1465 int i; 1466 unsigned long l; 1467 1468 if (s->state == SSL3_ST_CW_CERT_A) 1469 { 1470 if ((s->cert == NULL) || 1471 (s->cert->key->x509 == NULL) || 1472 (s->cert->key->privatekey == NULL)) 1473 s->state=SSL3_ST_CW_CERT_B; 1474 else 1475 s->state=SSL3_ST_CW_CERT_C; 1476 } 1477 1478 /* We need to get a client cert */ 1479 if (s->state == SSL3_ST_CW_CERT_B) 1480 { 1481 /* If we get an error, we need to 1482 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 1483 * We then get retied later */ 1484 i=0; 1485 i = ssl_do_client_cert_cb(s, &x509, &pkey); 1486 if (i < 0) 1487 { 1488 s->rwstate=SSL_X509_LOOKUP; 1489 return(-1); 1490 } 1491 s->rwstate=SSL_NOTHING; 1492 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) 1493 { 1494 s->state=SSL3_ST_CW_CERT_B; 1495 if ( !SSL_use_certificate(s,x509) || 1496 !SSL_use_PrivateKey(s,pkey)) 1497 i=0; 1498 } 1499 else if (i == 1) 1500 { 1501 i=0; 1502 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 1503 } 1504 1505 if (x509 != NULL) X509_free(x509); 1506 if (pkey != NULL) EVP_PKEY_free(pkey); 1507 if (i == 0) 1508 { 1509 if (s->version == SSL3_VERSION) 1510 { 1511 s->s3->tmp.cert_req=0; 1512 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE); 1513 return(1); 1514 } 1515 else 1516 { 1517 s->s3->tmp.cert_req=2; 1518 } 1519 } 1520 1521 /* Ok, we have a cert */ 1522 s->state=SSL3_ST_CW_CERT_C; 1523 } 1524 1525 if (s->state == SSL3_ST_CW_CERT_C) 1526 { 1527 s->state=SSL3_ST_CW_CERT_D; 1528 l=dtls1_output_cert_chain(s, 1529 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509); 1530 s->init_num=(int)l; 1531 s->init_off=0; 1532 1533 /* set header called by dtls1_output_cert_chain() */ 1534 1535 /* buffer the message to handle re-xmits */ 1536 dtls1_buffer_message(s, 0); 1537 } 1538 /* SSL3_ST_CW_CERT_D */ 1539 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1540 } 1541 1542 1543
