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) 1999-2005 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 #include "kssl_lcl.h" 119 #include <openssl/buffer.h> 120 #include <openssl/rand.h> 121 #include <openssl/objects.h> 122 #include <openssl/evp.h> 123 #include <openssl/md5.h> 124 #ifndef OPENSSL_NO_DH 125 #include <openssl/dh.h> 126 #endif 127 128 static SSL_METHOD *dtls1_get_client_method(int ver); 129 static int dtls1_get_hello_verify(SSL *s); 130 131 static SSL_METHOD *dtls1_get_client_method(int ver) 132 { 133 if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER) 134 return(DTLSv1_client_method()); 135 else 136 return(NULL); 137 } 138 139 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method, 140 ssl_undefined_function, 141 dtls1_connect, 142 dtls1_get_client_method) 143 144 int dtls1_connect(SSL *s) 145 { 146 BUF_MEM *buf=NULL; 147 unsigned long Time=(unsigned long)time(NULL),l; 148 void (*cb)(const SSL *ssl,int type,int val)=NULL; 149 int ret= -1; 150 int new_state,state,skip=0;; 151 152 RAND_add(&Time,sizeof(Time),0); 153 ERR_clear_error(); 154 clear_sys_error(); 155 156 if (s->info_callback != NULL) 157 cb=s->info_callback; 158 else if (s->ctx->info_callback != NULL) 159 cb=s->ctx->info_callback; 160 161 s->in_handshake++; 162 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 163 164 for (;;) 165 { 166 state=s->state; 167 168 switch(s->state) 169 { 170 case SSL_ST_RENEGOTIATE: 171 s->new_session=1; 172 s->state=SSL_ST_CONNECT; 173 s->ctx->stats.sess_connect_renegotiate++; 174 /* break */ 175 case SSL_ST_BEFORE: 176 case SSL_ST_CONNECT: 177 case SSL_ST_BEFORE|SSL_ST_CONNECT: 178 case SSL_ST_OK|SSL_ST_CONNECT: 179 180 s->server=0; 181 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 182 183 if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) && 184 (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00)) 185 { 186 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR); 187 ret = -1; 188 goto end; 189 } 190 191 /* s->version=SSL3_VERSION; */ 192 s->type=SSL_ST_CONNECT; 193 194 if (s->init_buf == NULL) 195 { 196 if ((buf=BUF_MEM_new()) == NULL) 197 { 198 ret= -1; 199 goto end; 200 } 201 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 202 { 203 ret= -1; 204 goto end; 205 } 206 s->init_buf=buf; 207 buf=NULL; 208 } 209 210 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } 211 212 /* setup buffing BIO */ 213 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; } 214 215 /* don't push the buffering BIO quite yet */ 216 217 s->state=SSL3_ST_CW_CLNT_HELLO_A; 218 s->ctx->stats.sess_connect++; 219 s->init_num=0; 220 /* mark client_random uninitialized */ 221 memset(s->s3->client_random,0,sizeof(s->s3->client_random)); 222 s->d1->send_cookie = 0; 223 s->hit = 0; 224 break; 225 226 case SSL3_ST_CW_CLNT_HELLO_A: 227 case SSL3_ST_CW_CLNT_HELLO_B: 228 229 s->shutdown=0; 230 231 /* every DTLS ClientHello resets Finished MAC */ 232 ssl3_init_finished_mac(s); 233 234 dtls1_start_timer(s); 235 ret=dtls1_client_hello(s); 236 if (ret <= 0) goto end; 237 238 if ( s->d1->send_cookie) 239 { 240 s->state=SSL3_ST_CW_FLUSH; 241 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A; 242 } 243 else 244 s->state=SSL3_ST_CR_SRVR_HELLO_A; 245 246 s->init_num=0; 247 248 /* turn on buffering for the next lot of output */ 249 if (s->bbio != s->wbio) 250 s->wbio=BIO_push(s->bbio,s->wbio); 251 252 break; 253 254 case SSL3_ST_CR_SRVR_HELLO_A: 255 case SSL3_ST_CR_SRVR_HELLO_B: 256 ret=ssl3_get_server_hello(s); 257 if (ret <= 0) goto end; 258 else 259 { 260 dtls1_stop_timer(s); 261 if (s->hit) 262 s->state=SSL3_ST_CR_FINISHED_A; 263 else 264 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 265 } 266 s->init_num=0; 267 break; 268 269 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 270 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 271 272 ret = dtls1_get_hello_verify(s); 273 if ( ret <= 0) 274 goto end; 275 dtls1_stop_timer(s); 276 if ( s->d1->send_cookie) /* start again, with a cookie */ 277 s->state=SSL3_ST_CW_CLNT_HELLO_A; 278 else 279 s->state = SSL3_ST_CR_CERT_A; 280 s->init_num = 0; 281 break; 282 283 case SSL3_ST_CR_CERT_A: 284 case SSL3_ST_CR_CERT_B: 285 #ifndef OPENSSL_NO_TLSEXT 286 ret=ssl3_check_finished(s); 287 if (ret <= 0) goto end; 288 if (ret == 2) 289 { 290 s->hit = 1; 291 if (s->tlsext_ticket_expected) 292 s->state=SSL3_ST_CR_SESSION_TICKET_A; 293 else 294 s->state=SSL3_ST_CR_FINISHED_A; 295 s->init_num=0; 296 break; 297 } 298 #endif 299 /* Check if it is anon DH */ 300 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) 301 { 302 ret=ssl3_get_server_certificate(s); 303 if (ret <= 0) goto end; 304 #ifndef OPENSSL_NO_TLSEXT 305 if (s->tlsext_status_expected) 306 s->state=SSL3_ST_CR_CERT_STATUS_A; 307 else 308 s->state=SSL3_ST_CR_KEY_EXCH_A; 309 } 310 else 311 { 312 skip = 1; 313 s->state=SSL3_ST_CR_KEY_EXCH_A; 314 } 315 #else 316 } 317 else 318 skip=1; 319 320 s->state=SSL3_ST_CR_KEY_EXCH_A; 321 #endif 322 s->init_num=0; 323 break; 324 325 case SSL3_ST_CR_KEY_EXCH_A: 326 case SSL3_ST_CR_KEY_EXCH_B: 327 ret=ssl3_get_key_exchange(s); 328 if (ret <= 0) goto end; 329 s->state=SSL3_ST_CR_CERT_REQ_A; 330 s->init_num=0; 331 332 /* at this point we check that we have the 333 * required stuff from the server */ 334 if (!ssl3_check_cert_and_algorithm(s)) 335 { 336 ret= -1; 337 goto end; 338 } 339 break; 340 341 case SSL3_ST_CR_CERT_REQ_A: 342 case SSL3_ST_CR_CERT_REQ_B: 343 ret=ssl3_get_certificate_request(s); 344 if (ret <= 0) goto end; 345 s->state=SSL3_ST_CR_SRVR_DONE_A; 346 s->init_num=0; 347 break; 348 349 case SSL3_ST_CR_SRVR_DONE_A: 350 case SSL3_ST_CR_SRVR_DONE_B: 351 ret=ssl3_get_server_done(s); 352 if (ret <= 0) goto end; 353 if (s->s3->tmp.cert_req) 354 s->state=SSL3_ST_CW_CERT_A; 355 else 356 s->state=SSL3_ST_CW_KEY_EXCH_A; 357 s->init_num=0; 358 359 break; 360 361 case SSL3_ST_CW_CERT_A: 362 case SSL3_ST_CW_CERT_B: 363 case SSL3_ST_CW_CERT_C: 364 case SSL3_ST_CW_CERT_D: 365 dtls1_start_timer(s); 366 ret=dtls1_send_client_certificate(s); 367 if (ret <= 0) goto end; 368 s->state=SSL3_ST_CW_KEY_EXCH_A; 369 s->init_num=0; 370 break; 371 372 case SSL3_ST_CW_KEY_EXCH_A: 373 case SSL3_ST_CW_KEY_EXCH_B: 374 dtls1_start_timer(s); 375 ret=dtls1_send_client_key_exchange(s); 376 if (ret <= 0) goto end; 377 l=s->s3->tmp.new_cipher->algorithms; 378 /* EAY EAY EAY need to check for DH fix cert 379 * sent back */ 380 /* For TLS, cert_req is set to 2, so a cert chain 381 * of nothing is sent, but no verify packet is sent */ 382 if (s->s3->tmp.cert_req == 1) 383 { 384 s->state=SSL3_ST_CW_CERT_VRFY_A; 385 } 386 else 387 { 388 s->state=SSL3_ST_CW_CHANGE_A; 389 s->s3->change_cipher_spec=0; 390 } 391 392 s->init_num=0; 393 break; 394 395 case SSL3_ST_CW_CERT_VRFY_A: 396 case SSL3_ST_CW_CERT_VRFY_B: 397 dtls1_start_timer(s); 398 ret=dtls1_send_client_verify(s); 399 if (ret <= 0) goto end; 400 s->state=SSL3_ST_CW_CHANGE_A; 401 s->init_num=0; 402 s->s3->change_cipher_spec=0; 403 break; 404 405 case SSL3_ST_CW_CHANGE_A: 406 case SSL3_ST_CW_CHANGE_B: 407 dtls1_start_timer(s); 408 ret=dtls1_send_change_cipher_spec(s, 409 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B); 410 if (ret <= 0) goto end; 411 s->state=SSL3_ST_CW_FINISHED_A; 412 s->init_num=0; 413 414 s->session->cipher=s->s3->tmp.new_cipher; 415 #ifdef OPENSSL_NO_COMP 416 s->session->compress_meth=0; 417 #else 418 if (s->s3->tmp.new_compression == NULL) 419 s->session->compress_meth=0; 420 else 421 s->session->compress_meth= 422 s->s3->tmp.new_compression->id; 423 #endif 424 if (!s->method->ssl3_enc->setup_key_block(s)) 425 { 426 ret= -1; 427 goto end; 428 } 429 430 if (!s->method->ssl3_enc->change_cipher_state(s, 431 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 432 { 433 ret= -1; 434 goto end; 435 } 436 437 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 438 break; 439 440 case SSL3_ST_CW_FINISHED_A: 441 case SSL3_ST_CW_FINISHED_B: 442 dtls1_start_timer(s); 443 ret=dtls1_send_finished(s, 444 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B, 445 s->method->ssl3_enc->client_finished_label, 446 s->method->ssl3_enc->client_finished_label_len); 447 if (ret <= 0) goto end; 448 s->state=SSL3_ST_CW_FLUSH; 449 450 /* clear flags */ 451 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER; 452 if (s->hit) 453 { 454 s->s3->tmp.next_state=SSL_ST_OK; 455 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) 456 { 457 s->state=SSL_ST_OK; 458 s->s3->flags|=SSL3_FLAGS_POP_BUFFER; 459 s->s3->delay_buf_pop_ret=0; 460 } 461 } 462 else 463 { 464 #ifndef OPENSSL_NO_TLSEXT 465 /* Allow NewSessionTicket if ticket expected */ 466 if (s->tlsext_ticket_expected) 467 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A; 468 else 469 #endif 470 471 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A; 472 } 473 s->init_num=0; 474 475 break; 476 477 #ifndef OPENSSL_NO_TLSEXT 478 case SSL3_ST_CR_SESSION_TICKET_A: 479 case SSL3_ST_CR_SESSION_TICKET_B: 480 ret=ssl3_get_new_session_ticket(s); 481 if (ret <= 0) goto end; 482 s->state=SSL3_ST_CR_FINISHED_A; 483 s->init_num=0; 484 break; 485 486 case SSL3_ST_CR_CERT_STATUS_A: 487 case SSL3_ST_CR_CERT_STATUS_B: 488 ret=ssl3_get_cert_status(s); 489 if (ret <= 0) goto end; 490 s->state=SSL3_ST_CR_KEY_EXCH_A; 491 s->init_num=0; 492 break; 493 #endif 494 495 case SSL3_ST_CR_FINISHED_A: 496 case SSL3_ST_CR_FINISHED_B: 497 s->d1->change_cipher_spec_ok = 1; 498 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A, 499 SSL3_ST_CR_FINISHED_B); 500 if (ret <= 0) goto end; 501 dtls1_stop_timer(s); 502 503 if (s->hit) 504 s->state=SSL3_ST_CW_CHANGE_A; 505 else 506 s->state=SSL_ST_OK; 507 s->init_num=0; 508 break; 509 510 case SSL3_ST_CW_FLUSH: 511 s->rwstate=SSL_WRITING; 512 if (BIO_flush(s->wbio) <= 0) 513 { 514 ret= -1; 515 goto end; 516 } 517 s->rwstate=SSL_NOTHING; 518 s->state=s->s3->tmp.next_state; 519 break; 520 521 case SSL_ST_OK: 522 /* clean a few things up */ 523 ssl3_cleanup_key_block(s); 524 525 #if 0 526 if (s->init_buf != NULL) 527 { 528 BUF_MEM_free(s->init_buf); 529 s->init_buf=NULL; 530 } 531 #endif 532 533 /* If we are not 'joining' the last two packets, 534 * remove the buffering now */ 535 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 536 ssl_free_wbio_buffer(s); 537 /* else do it later in ssl3_write */ 538 539 s->init_num=0; 540 s->new_session=0; 541 542 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT); 543 if (s->hit) s->ctx->stats.sess_hit++; 544 545 ret=1; 546 /* s->server=0; */ 547 s->handshake_func=dtls1_connect; 548 s->ctx->stats.sess_connect_good++; 549 550 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 551 552 /* done with handshaking */ 553 s->d1->handshake_read_seq = 0; 554 s->d1->next_handshake_write_seq = 0; 555 goto end; 556 /* break; */ 557 558 default: 559 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE); 560 ret= -1; 561 goto end; 562 /* break; */ 563 } 564 565 /* did we do anything */ 566 if (!s->s3->tmp.reuse_message && !skip) 567 { 568 if (s->debug) 569 { 570 if ((ret=BIO_flush(s->wbio)) <= 0) 571 goto end; 572 } 573 574 if ((cb != NULL) && (s->state != state)) 575 { 576 new_state=s->state; 577 s->state=state; 578 cb(s,SSL_CB_CONNECT_LOOP,1); 579 s->state=new_state; 580 } 581 } 582 skip=0; 583 } 584 end: 585 s->in_handshake--; 586 if (buf != NULL) 587 BUF_MEM_free(buf); 588 if (cb != NULL) 589 cb(s,SSL_CB_CONNECT_EXIT,ret); 590 return(ret); 591 } 592 593 int dtls1_client_hello(SSL *s) 594 { 595 unsigned char *buf; 596 unsigned char *p,*d; 597 unsigned int i,j; 598 unsigned long Time,l; 599 SSL_COMP *comp; 600 601 buf=(unsigned char *)s->init_buf->data; 602 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) 603 { 604 SSL_SESSION *sess = s->session; 605 if ((s->session == NULL) || 606 (s->session->ssl_version != s->version) || 607 #ifdef OPENSSL_NO_TLSEXT 608 !sess->session_id_length || 609 #else 610 (!sess->session_id_length && !sess->tlsext_tick) || 611 #endif 612 (s->session->not_resumable)) 613 { 614 if (!ssl_get_new_session(s,0)) 615 goto err; 616 } 617 /* else use the pre-loaded session */ 618 619 p=s->s3->client_random; 620 /* if client_random is initialized, reuse it, we are 621 * required to use same upon reply to HelloVerify */ 622 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ; 623 if (i==sizeof(s->s3->client_random)) 624 { 625 Time=(unsigned long)time(NULL); /* Time */ 626 l2n(Time,p); 627 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4); 628 } 629 630 /* Do the message type and length last */ 631 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 632 633 *(p++)=s->version>>8; 634 *(p++)=s->version&0xff; 635 s->client_version=s->version; 636 637 /* Random stuff */ 638 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 639 p+=SSL3_RANDOM_SIZE; 640 641 /* Session ID */ 642 if (s->new_session) 643 i=0; 644 else 645 i=s->session->session_id_length; 646 *(p++)=i; 647 if (i != 0) 648 { 649 if (i > sizeof s->session->session_id) 650 { 651 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 652 goto err; 653 } 654 memcpy(p,s->session->session_id,i); 655 p+=i; 656 } 657 658 /* cookie stuff */ 659 if ( s->d1->cookie_len > sizeof(s->d1->cookie)) 660 { 661 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 662 goto err; 663 } 664 *(p++) = s->d1->cookie_len; 665 memcpy(p, s->d1->cookie, s->d1->cookie_len); 666 p += s->d1->cookie_len; 667 668 /* Ciphers supported */ 669 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0); 670 if (i == 0) 671 { 672 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 673 goto err; 674 } 675 s2n(i,p); 676 p+=i; 677 678 /* COMPRESSION */ 679 if (s->ctx->comp_methods == NULL) 680 j=0; 681 else 682 j=sk_SSL_COMP_num(s->ctx->comp_methods); 683 *(p++)=1+j; 684 for (i=0; i<j; i++) 685 { 686 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 687 *(p++)=comp->id; 688 } 689 *(p++)=0; /* Add the NULL method */ 690 691 #ifndef OPENSSL_NO_TLSEXT 692 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 693 { 694 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 695 goto err; 696 } 697 #endif 698 699 l=(p-d); 700 d=buf; 701 702 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l); 703 704 s->state=SSL3_ST_CW_CLNT_HELLO_B; 705 /* number of bytes to write */ 706 s->init_num=p-buf; 707 s->init_off=0; 708 709 /* buffer the message to handle re-xmits */ 710 dtls1_buffer_message(s, 0); 711 } 712 713 /* SSL3_ST_CW_CLNT_HELLO_B */ 714 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 715 err: 716 return(-1); 717 } 718 719 static int dtls1_get_hello_verify(SSL *s) 720 { 721 int n, al, ok = 0; 722 unsigned char *data; 723 unsigned int cookie_len; 724 725 n=s->method->ssl_get_message(s, 726 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 727 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 728 -1, 729 s->max_cert_list, 730 &ok); 731 732 if (!ok) return((int)n); 733 734 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) 735 { 736 s->d1->send_cookie = 0; 737 s->s3->tmp.reuse_message=1; 738 return(1); 739 } 740 741 data = (unsigned char *)s->init_msg; 742 743 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff))) 744 { 745 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION); 746 s->version=(s->version&0xff00)|data[1]; 747 al = SSL_AD_PROTOCOL_VERSION; 748 goto f_err; 749 } 750 data+=2; 751 752 cookie_len = *(data++); 753 if ( cookie_len > sizeof(s->d1->cookie)) 754 { 755 al=SSL_AD_ILLEGAL_PARAMETER; 756 goto f_err; 757 } 758 759 memcpy(s->d1->cookie, data, cookie_len); 760 s->d1->cookie_len = cookie_len; 761 762 s->d1->send_cookie = 1; 763 return 1; 764 765 f_err: 766 ssl3_send_alert(s, SSL3_AL_FATAL, al); 767 return -1; 768 } 769 770 int dtls1_send_client_key_exchange(SSL *s) 771 { 772 unsigned char *p,*d; 773 int n; 774 unsigned long l; 775 #ifndef OPENSSL_NO_RSA 776 unsigned char *q; 777 EVP_PKEY *pkey=NULL; 778 #endif 779 #ifndef OPENSSL_NO_KRB5 780 KSSL_ERR kssl_err; 781 #endif /* OPENSSL_NO_KRB5 */ 782 783 if (s->state == SSL3_ST_CW_KEY_EXCH_A) 784 { 785 d=(unsigned char *)s->init_buf->data; 786 p= &(d[DTLS1_HM_HEADER_LENGTH]); 787 788 l=s->s3->tmp.new_cipher->algorithms; 789 790 /* Fool emacs indentation */ 791 if (0) {} 792 #ifndef OPENSSL_NO_RSA 793 else if (l & SSL_kRSA) 794 { 795 RSA *rsa; 796 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 797 798 if (s->session->sess_cert->peer_rsa_tmp != NULL) 799 rsa=s->session->sess_cert->peer_rsa_tmp; 800 else 801 { 802 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 803 if ((pkey == NULL) || 804 (pkey->type != EVP_PKEY_RSA) || 805 (pkey->pkey.rsa == NULL)) 806 { 807 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 808 goto err; 809 } 810 rsa=pkey->pkey.rsa; 811 EVP_PKEY_free(pkey); 812 } 813 814 tmp_buf[0]=s->client_version>>8; 815 tmp_buf[1]=s->client_version&0xff; 816 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) 817 goto err; 818 819 s->session->master_key_length=sizeof tmp_buf; 820 821 q=p; 822 /* Fix buf for TLS and [incidentally] DTLS */ 823 if (s->version > SSL3_VERSION) 824 p+=2; 825 n=RSA_public_encrypt(sizeof tmp_buf, 826 tmp_buf,p,rsa,RSA_PKCS1_PADDING); 827 #ifdef PKCS1_CHECK 828 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++; 829 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70; 830 #endif 831 if (n <= 0) 832 { 833 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT); 834 goto err; 835 } 836 837 /* Fix buf for TLS and [incidentally] DTLS */ 838 if (s->version > SSL3_VERSION) 839 { 840 s2n(n,q); 841 n+=2; 842 } 843 844 s->session->master_key_length= 845 s->method->ssl3_enc->generate_master_secret(s, 846 s->session->master_key, 847 tmp_buf,sizeof tmp_buf); 848 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf); 849 } 850 #endif 851 #ifndef OPENSSL_NO_KRB5 852 else if (l & SSL_kKRB5) 853 { 854 krb5_error_code krb5rc; 855 KSSL_CTX *kssl_ctx = s->kssl_ctx; 856 /* krb5_data krb5_ap_req; */ 857 krb5_data *enc_ticket; 858 krb5_data authenticator, *authp = NULL; 859 EVP_CIPHER_CTX ciph_ctx; 860 EVP_CIPHER *enc = NULL; 861 unsigned char iv[EVP_MAX_IV_LENGTH]; 862 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 863 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH 864 + EVP_MAX_IV_LENGTH]; 865 int padl, outl = sizeof(epms); 866 867 EVP_CIPHER_CTX_init(&ciph_ctx); 868 869 #ifdef KSSL_DEBUG 870 printf("ssl3_send_client_key_exchange(%lx & %lx)\n", 871 l, SSL_kKRB5); 872 #endif /* KSSL_DEBUG */ 873 874 authp = NULL; 875 #ifdef KRB5SENDAUTH 876 if (KRB5SENDAUTH) authp = &authenticator; 877 #endif /* KRB5SENDAUTH */ 878 879 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, 880 &kssl_err); 881 enc = kssl_map_enc(kssl_ctx->enctype); 882 if (enc == NULL) 883 goto err; 884 #ifdef KSSL_DEBUG 885 { 886 printf("kssl_cget_tkt rtn %d\n", krb5rc); 887 if (krb5rc && kssl_err.text) 888 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 889 } 890 #endif /* KSSL_DEBUG */ 891 892 if (krb5rc) 893 { 894 ssl3_send_alert(s,SSL3_AL_FATAL, 895 SSL_AD_HANDSHAKE_FAILURE); 896 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 897 kssl_err.reason); 898 goto err; 899 } 900 901 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ 902 ** in place of RFC 2712 KerberosWrapper, as in: 903 ** 904 ** Send ticket (copy to *p, set n = length) 905 ** n = krb5_ap_req.length; 906 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 907 ** if (krb5_ap_req.data) 908 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 909 ** 910 ** Now using real RFC 2712 KerberosWrapper 911 ** (Thanks to Simon Wilkinson <sxw (at) sxw.org.uk>) 912 ** Note: 2712 "opaque" types are here replaced 913 ** with a 2-byte length followed by the value. 914 ** Example: 915 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 916 ** Where "xx xx" = length bytes. Shown here with 917 ** optional authenticator omitted. 918 */ 919 920 /* KerberosWrapper.Ticket */ 921 s2n(enc_ticket->length,p); 922 memcpy(p, enc_ticket->data, enc_ticket->length); 923 p+= enc_ticket->length; 924 n = enc_ticket->length + 2; 925 926 /* KerberosWrapper.Authenticator */ 927 if (authp && authp->length) 928 { 929 s2n(authp->length,p); 930 memcpy(p, authp->data, authp->length); 931 p+= authp->length; 932 n+= authp->length + 2; 933 934 free(authp->data); 935 authp->data = NULL; 936 authp->length = 0; 937 } 938 else 939 { 940 s2n(0,p);/* null authenticator length */ 941 n+=2; 942 } 943 944 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0) 945 goto err; 946 947 /* 20010420 VRS. Tried it this way; failed. 948 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 949 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 950 ** kssl_ctx->length); 951 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 952 */ 953 954 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 955 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL, 956 kssl_ctx->key,iv); 957 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf, 958 sizeof tmp_buf); 959 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl); 960 outl += padl; 961 if (outl > sizeof epms) 962 { 963 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 964 goto err; 965 } 966 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 967 968 /* KerberosWrapper.EncryptedPreMasterSecret */ 969 s2n(outl,p); 970 memcpy(p, epms, outl); 971 p+=outl; 972 n+=outl + 2; 973 974 s->session->master_key_length= 975 s->method->ssl3_enc->generate_master_secret(s, 976 s->session->master_key, 977 tmp_buf, sizeof tmp_buf); 978 979 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 980 OPENSSL_cleanse(epms, outl); 981 } 982 #endif 983 #ifndef OPENSSL_NO_DH 984 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 985 { 986 DH *dh_srvr,*dh_clnt; 987 988 if (s->session->sess_cert->peer_dh_tmp != NULL) 989 dh_srvr=s->session->sess_cert->peer_dh_tmp; 990 else 991 { 992 /* we get them from the cert */ 993 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 994 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 995 goto err; 996 } 997 998 /* generate a new random key */ 999 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL) 1000 { 1001 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1002 goto err; 1003 } 1004 if (!DH_generate_key(dh_clnt)) 1005 { 1006 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1007 goto err; 1008 } 1009 1010 /* use the 'p' output buffer for the DH key, but 1011 * make sure to clear it out afterwards */ 1012 1013 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt); 1014 1015 if (n <= 0) 1016 { 1017 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1018 goto err; 1019 } 1020 1021 /* generate master key from the result */ 1022 s->session->master_key_length= 1023 s->method->ssl3_enc->generate_master_secret(s, 1024 s->session->master_key,p,n); 1025 /* clean up */ 1026 memset(p,0,n); 1027 1028 /* send off the data */ 1029 n=BN_num_bytes(dh_clnt->pub_key); 1030 s2n(n,p); 1031 BN_bn2bin(dh_clnt->pub_key,p); 1032 n+=2; 1033 1034 DH_free(dh_clnt); 1035 1036 /* perhaps clean things up a bit EAY EAY EAY EAY*/ 1037 } 1038 #endif 1039 else 1040 { 1041 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1042 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1043 goto err; 1044 } 1045 1046 d = dtls1_set_message_header(s, d, 1047 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); 1048 /* 1049 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 1050 l2n3(n,d); 1051 l2n(s->d1->handshake_write_seq,d); 1052 s->d1->handshake_write_seq++; 1053 */ 1054 1055 s->state=SSL3_ST_CW_KEY_EXCH_B; 1056 /* number of bytes to write */ 1057 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1058 s->init_off=0; 1059 1060 /* buffer the message to handle re-xmits */ 1061 dtls1_buffer_message(s, 0); 1062 } 1063 1064 /* SSL3_ST_CW_KEY_EXCH_B */ 1065 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1066 err: 1067 return(-1); 1068 } 1069 1070 int dtls1_send_client_verify(SSL *s) 1071 { 1072 unsigned char *p,*d; 1073 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1074 EVP_PKEY *pkey; 1075 #ifndef OPENSSL_NO_RSA 1076 unsigned u=0; 1077 #endif 1078 unsigned long n; 1079 #ifndef OPENSSL_NO_DSA 1080 int j; 1081 #endif 1082 1083 if (s->state == SSL3_ST_CW_CERT_VRFY_A) 1084 { 1085 d=(unsigned char *)s->init_buf->data; 1086 p= &(d[DTLS1_HM_HEADER_LENGTH]); 1087 pkey=s->cert->key->privatekey; 1088 1089 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2), 1090 &(data[MD5_DIGEST_LENGTH])); 1091 1092 #ifndef OPENSSL_NO_RSA 1093 if (pkey->type == EVP_PKEY_RSA) 1094 { 1095 s->method->ssl3_enc->cert_verify_mac(s, 1096 &(s->s3->finish_dgst1),&(data[0])); 1097 if (RSA_sign(NID_md5_sha1, data, 1098 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, 1099 &(p[2]), &u, pkey->pkey.rsa) <= 0 ) 1100 { 1101 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB); 1102 goto err; 1103 } 1104 s2n(u,p); 1105 n=u+2; 1106 } 1107 else 1108 #endif 1109 #ifndef OPENSSL_NO_DSA 1110 if (pkey->type == EVP_PKEY_DSA) 1111 { 1112 if (!DSA_sign(pkey->save_type, 1113 &(data[MD5_DIGEST_LENGTH]), 1114 SHA_DIGEST_LENGTH,&(p[2]), 1115 (unsigned int *)&j,pkey->pkey.dsa)) 1116 { 1117 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB); 1118 goto err; 1119 } 1120 s2n(j,p); 1121 n=j+2; 1122 } 1123 else 1124 #endif 1125 { 1126 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR); 1127 goto err; 1128 } 1129 1130 d = dtls1_set_message_header(s, d, 1131 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ; 1132 1133 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH; 1134 s->init_off=0; 1135 1136 /* buffer the message to handle re-xmits */ 1137 dtls1_buffer_message(s, 0); 1138 1139 s->state = SSL3_ST_CW_CERT_VRFY_B; 1140 } 1141 1142 /* s->state = SSL3_ST_CW_CERT_VRFY_B */ 1143 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1144 err: 1145 return(-1); 1146 } 1147 1148 int dtls1_send_client_certificate(SSL *s) 1149 { 1150 X509 *x509=NULL; 1151 EVP_PKEY *pkey=NULL; 1152 int i; 1153 unsigned long l; 1154 1155 if (s->state == SSL3_ST_CW_CERT_A) 1156 { 1157 if ((s->cert == NULL) || 1158 (s->cert->key->x509 == NULL) || 1159 (s->cert->key->privatekey == NULL)) 1160 s->state=SSL3_ST_CW_CERT_B; 1161 else 1162 s->state=SSL3_ST_CW_CERT_C; 1163 } 1164 1165 /* We need to get a client cert */ 1166 if (s->state == SSL3_ST_CW_CERT_B) 1167 { 1168 /* If we get an error, we need to 1169 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 1170 * We then get retied later */ 1171 i=0; 1172 i = ssl_do_client_cert_cb(s, &x509, &pkey); 1173 if (i < 0) 1174 { 1175 s->rwstate=SSL_X509_LOOKUP; 1176 return(-1); 1177 } 1178 s->rwstate=SSL_NOTHING; 1179 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) 1180 { 1181 s->state=SSL3_ST_CW_CERT_B; 1182 if ( !SSL_use_certificate(s,x509) || 1183 !SSL_use_PrivateKey(s,pkey)) 1184 i=0; 1185 } 1186 else if (i == 1) 1187 { 1188 i=0; 1189 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 1190 } 1191 1192 if (x509 != NULL) X509_free(x509); 1193 if (pkey != NULL) EVP_PKEY_free(pkey); 1194 if (i == 0) 1195 { 1196 if (s->version == SSL3_VERSION) 1197 { 1198 s->s3->tmp.cert_req=0; 1199 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE); 1200 return(1); 1201 } 1202 else 1203 { 1204 s->s3->tmp.cert_req=2; 1205 } 1206 } 1207 1208 /* Ok, we have a cert */ 1209 s->state=SSL3_ST_CW_CERT_C; 1210 } 1211 1212 if (s->state == SSL3_ST_CW_CERT_C) 1213 { 1214 s->state=SSL3_ST_CW_CERT_D; 1215 l=dtls1_output_cert_chain(s, 1216 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509); 1217 s->init_num=(int)l; 1218 s->init_off=0; 1219 1220 /* set header called by dtls1_output_cert_chain() */ 1221 1222 /* buffer the message to handle re-xmits */ 1223 dtls1_buffer_message(s, 0); 1224 } 1225 /* SSL3_ST_CW_CERT_D */ 1226 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1227 } 1228 1229 1230
