d1_clnt.c revision 194206
1/* ssl/d1_clnt.c */ 2/* 3 * DTLS implementation written by Nagendra Modadugu 4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. 5 */ 6/* ==================================================================== 7 * Copyright (c) 1999-2005 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@OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay@cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh@cryptsoft.com). 57 * 58 */ 59/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 60 * All rights reserved. 61 * 62 * This package is an SSL implementation written 63 * by Eric Young (eay@cryptsoft.com). 64 * The implementation was written so as to conform with Netscapes SSL. 65 * 66 * This library is free for commercial and non-commercial use as long as 67 * the following conditions are aheared to. The following conditions 68 * apply to all code found in this distribution, be it the RC4, RSA, 69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 70 * included with this distribution is covered by the same copyright terms 71 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 72 * 73 * Copyright remains Eric Young's, and as such any Copyright notices in 74 * the code are not to be removed. 75 * If this package is used in a product, Eric Young should be given attribution 76 * as the author of the parts of the library used. 77 * This can be in the form of a textual message at program startup or 78 * in documentation (online or textual) provided with the package. 79 * 80 * Redistribution and use in source and binary forms, with or without 81 * modification, are permitted provided that the following conditions 82 * are met: 83 * 1. Redistributions of source code must retain the copyright 84 * notice, this list of conditions and the following disclaimer. 85 * 2. Redistributions in binary form must reproduce the above copyright 86 * notice, this list of conditions and the following disclaimer in the 87 * documentation and/or other materials provided with the distribution. 88 * 3. All advertising materials mentioning features or use of this software 89 * must display the following acknowledgement: 90 * "This product includes cryptographic software written by 91 * Eric Young (eay@cryptsoft.com)" 92 * The word 'cryptographic' can be left out if the rouines from the library 93 * being used are not cryptographic related :-). 94 * 4. If you include any Windows specific code (or a derivative thereof) from 95 * the apps directory (application code) you must include an acknowledgement: 96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 97 * 98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 101 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 108 * SUCH DAMAGE. 109 * 110 * The licence and distribution terms for any publically available version or 111 * derivative of this code cannot be changed. i.e. this code cannot simply be 112 * copied and put under another distribution licence 113 * [including the GNU Public Licence.] 114 */ 115 116#include <stdio.h> 117#include "ssl_locl.h" 118#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 128static SSL_METHOD *dtls1_get_client_method(int ver); 129static int dtls1_get_hello_verify(SSL *s); 130 131static SSL_METHOD *dtls1_get_client_method(int ver) 132 { 133 if (ver == DTLS1_VERSION) 134 return(DTLSv1_client_method()); 135 else 136 return(NULL); 137 } 138 139IMPLEMENT_dtls1_meth_func(DTLSv1_client_method, 140 ssl_undefined_function, 141 dtls1_connect, 142 dtls1_get_client_method) 143 144int dtls1_connect(SSL *s) 145 { 146 BUF_MEM *buf=NULL; 147 unsigned long Time=(unsigned long)time(NULL),l; 148 long num1; 149 void (*cb)(const SSL *ssl,int type,int val)=NULL; 150 int ret= -1; 151 int new_state,state,skip=0;; 152 153 RAND_add(&Time,sizeof(Time),0); 154 ERR_clear_error(); 155 clear_sys_error(); 156 157 if (s->info_callback != NULL) 158 cb=s->info_callback; 159 else if (s->ctx->info_callback != NULL) 160 cb=s->ctx->info_callback; 161 162 s->in_handshake++; 163 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 164 165 for (;;) 166 { 167 state=s->state; 168 169 switch(s->state) 170 { 171 case SSL_ST_RENEGOTIATE: 172 s->new_session=1; 173 s->state=SSL_ST_CONNECT; 174 s->ctx->stats.sess_connect_renegotiate++; 175 /* break */ 176 case SSL_ST_BEFORE: 177 case SSL_ST_CONNECT: 178 case SSL_ST_BEFORE|SSL_ST_CONNECT: 179 case SSL_ST_OK|SSL_ST_CONNECT: 180 181 s->server=0; 182 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 183 184 if ((s->version & 0xff00 ) != (DTLS1_VERSION & 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 break; 223 224 case SSL3_ST_CW_CLNT_HELLO_A: 225 case SSL3_ST_CW_CLNT_HELLO_B: 226 227 s->shutdown=0; 228 229 /* every DTLS ClientHello resets Finished MAC */ 230 ssl3_init_finished_mac(s); 231 232 ret=dtls1_client_hello(s); 233 if (ret <= 0) goto end; 234 235 if ( s->d1->send_cookie) 236 { 237 s->state=SSL3_ST_CW_FLUSH; 238 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A; 239 } 240 else 241 s->state=SSL3_ST_CR_SRVR_HELLO_A; 242 243 s->init_num=0; 244 245 /* turn on buffering for the next lot of output */ 246 if (s->bbio != s->wbio) 247 s->wbio=BIO_push(s->bbio,s->wbio); 248 249 break; 250 251 case SSL3_ST_CR_SRVR_HELLO_A: 252 case SSL3_ST_CR_SRVR_HELLO_B: 253 ret=ssl3_get_server_hello(s); 254 if (ret <= 0) goto end; 255 else 256 { 257 if (s->hit) 258 s->state=SSL3_ST_CR_FINISHED_A; 259 else 260 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 261 } 262 s->init_num=0; 263 break; 264 265 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 266 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 267 268 ret = dtls1_get_hello_verify(s); 269 if ( ret <= 0) 270 goto end; 271 if ( s->d1->send_cookie) /* start again, with a cookie */ 272 s->state=SSL3_ST_CW_CLNT_HELLO_A; 273 else 274 s->state = SSL3_ST_CR_CERT_A; 275 s->init_num = 0; 276 break; 277 278 case SSL3_ST_CR_CERT_A: 279 case SSL3_ST_CR_CERT_B: 280 /* Check if it is anon DH */ 281 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) 282 { 283 ret=ssl3_get_server_certificate(s); 284 if (ret <= 0) goto end; 285 } 286 else 287 skip=1; 288 s->state=SSL3_ST_CR_KEY_EXCH_A; 289 s->init_num=0; 290 break; 291 292 case SSL3_ST_CR_KEY_EXCH_A: 293 case SSL3_ST_CR_KEY_EXCH_B: 294 ret=ssl3_get_key_exchange(s); 295 if (ret <= 0) goto end; 296 s->state=SSL3_ST_CR_CERT_REQ_A; 297 s->init_num=0; 298 299 /* at this point we check that we have the 300 * required stuff from the server */ 301 if (!ssl3_check_cert_and_algorithm(s)) 302 { 303 ret= -1; 304 goto end; 305 } 306 break; 307 308 case SSL3_ST_CR_CERT_REQ_A: 309 case SSL3_ST_CR_CERT_REQ_B: 310 ret=ssl3_get_certificate_request(s); 311 if (ret <= 0) goto end; 312 s->state=SSL3_ST_CR_SRVR_DONE_A; 313 s->init_num=0; 314 break; 315 316 case SSL3_ST_CR_SRVR_DONE_A: 317 case SSL3_ST_CR_SRVR_DONE_B: 318 ret=ssl3_get_server_done(s); 319 if (ret <= 0) goto end; 320 if (s->s3->tmp.cert_req) 321 s->state=SSL3_ST_CW_CERT_A; 322 else 323 s->state=SSL3_ST_CW_KEY_EXCH_A; 324 s->init_num=0; 325 326 break; 327 328 case SSL3_ST_CW_CERT_A: 329 case SSL3_ST_CW_CERT_B: 330 case SSL3_ST_CW_CERT_C: 331 case SSL3_ST_CW_CERT_D: 332 ret=dtls1_send_client_certificate(s); 333 if (ret <= 0) goto end; 334 s->state=SSL3_ST_CW_KEY_EXCH_A; 335 s->init_num=0; 336 break; 337 338 case SSL3_ST_CW_KEY_EXCH_A: 339 case SSL3_ST_CW_KEY_EXCH_B: 340 ret=dtls1_send_client_key_exchange(s); 341 if (ret <= 0) goto end; 342 l=s->s3->tmp.new_cipher->algorithms; 343 /* EAY EAY EAY need to check for DH fix cert 344 * sent back */ 345 /* For TLS, cert_req is set to 2, so a cert chain 346 * of nothing is sent, but no verify packet is sent */ 347 if (s->s3->tmp.cert_req == 1) 348 { 349 s->state=SSL3_ST_CW_CERT_VRFY_A; 350 } 351 else 352 { 353 s->state=SSL3_ST_CW_CHANGE_A; 354 s->s3->change_cipher_spec=0; 355 } 356 357 s->init_num=0; 358 break; 359 360 case SSL3_ST_CW_CERT_VRFY_A: 361 case SSL3_ST_CW_CERT_VRFY_B: 362 ret=dtls1_send_client_verify(s); 363 if (ret <= 0) goto end; 364 s->state=SSL3_ST_CW_CHANGE_A; 365 s->init_num=0; 366 s->s3->change_cipher_spec=0; 367 break; 368 369 case SSL3_ST_CW_CHANGE_A: 370 case SSL3_ST_CW_CHANGE_B: 371 ret=dtls1_send_change_cipher_spec(s, 372 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B); 373 if (ret <= 0) goto end; 374 s->state=SSL3_ST_CW_FINISHED_A; 375 s->init_num=0; 376 377 s->session->cipher=s->s3->tmp.new_cipher; 378#ifdef OPENSSL_NO_COMP 379 s->session->compress_meth=0; 380#else 381 if (s->s3->tmp.new_compression == NULL) 382 s->session->compress_meth=0; 383 else 384 s->session->compress_meth= 385 s->s3->tmp.new_compression->id; 386#endif 387 if (!s->method->ssl3_enc->setup_key_block(s)) 388 { 389 ret= -1; 390 goto end; 391 } 392 393 if (!s->method->ssl3_enc->change_cipher_state(s, 394 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 395 { 396 ret= -1; 397 goto end; 398 } 399 400 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 401 break; 402 403 case SSL3_ST_CW_FINISHED_A: 404 case SSL3_ST_CW_FINISHED_B: 405 ret=dtls1_send_finished(s, 406 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B, 407 s->method->ssl3_enc->client_finished_label, 408 s->method->ssl3_enc->client_finished_label_len); 409 if (ret <= 0) goto end; 410 s->state=SSL3_ST_CW_FLUSH; 411 412 /* clear flags */ 413 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER; 414 if (s->hit) 415 { 416 s->s3->tmp.next_state=SSL_ST_OK; 417 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) 418 { 419 s->state=SSL_ST_OK; 420 s->s3->flags|=SSL3_FLAGS_POP_BUFFER; 421 s->s3->delay_buf_pop_ret=0; 422 } 423 } 424 else 425 { 426 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A; 427 } 428 s->init_num=0; 429 /* mark client_random uninitialized */ 430 memset (s->s3->client_random,0,sizeof(s->s3->client_random)); 431 432 break; 433 434 case SSL3_ST_CR_FINISHED_A: 435 case SSL3_ST_CR_FINISHED_B: 436 437 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A, 438 SSL3_ST_CR_FINISHED_B); 439 if (ret <= 0) goto end; 440 441 if (s->hit) 442 s->state=SSL3_ST_CW_CHANGE_A; 443 else 444 s->state=SSL_ST_OK; 445 s->init_num=0; 446 break; 447 448 case SSL3_ST_CW_FLUSH: 449 /* number of bytes to be flushed */ 450 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL); 451 if (num1 > 0) 452 { 453 s->rwstate=SSL_WRITING; 454 num1=BIO_flush(s->wbio); 455 if (num1 <= 0) { ret= -1; goto end; } 456 s->rwstate=SSL_NOTHING; 457 } 458 459 s->state=s->s3->tmp.next_state; 460 break; 461 462 case SSL_ST_OK: 463 /* clean a few things up */ 464 ssl3_cleanup_key_block(s); 465 466#if 0 467 if (s->init_buf != NULL) 468 { 469 BUF_MEM_free(s->init_buf); 470 s->init_buf=NULL; 471 } 472#endif 473 474 /* If we are not 'joining' the last two packets, 475 * remove the buffering now */ 476 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 477 ssl_free_wbio_buffer(s); 478 /* else do it later in ssl3_write */ 479 480 s->init_num=0; 481 s->new_session=0; 482 483 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT); 484 if (s->hit) s->ctx->stats.sess_hit++; 485 486 ret=1; 487 /* s->server=0; */ 488 s->handshake_func=dtls1_connect; 489 s->ctx->stats.sess_connect_good++; 490 491 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 492 493 /* done with handshaking */ 494 s->d1->handshake_read_seq = 0; 495 goto end; 496 /* break; */ 497 498 default: 499 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE); 500 ret= -1; 501 goto end; 502 /* break; */ 503 } 504 505 /* did we do anything */ 506 if (!s->s3->tmp.reuse_message && !skip) 507 { 508 if (s->debug) 509 { 510 if ((ret=BIO_flush(s->wbio)) <= 0) 511 goto end; 512 } 513 514 if ((cb != NULL) && (s->state != state)) 515 { 516 new_state=s->state; 517 s->state=state; 518 cb(s,SSL_CB_CONNECT_LOOP,1); 519 s->state=new_state; 520 } 521 } 522 skip=0; 523 } 524end: 525 s->in_handshake--; 526 if (buf != NULL) 527 BUF_MEM_free(buf); 528 if (cb != NULL) 529 cb(s,SSL_CB_CONNECT_EXIT,ret); 530 return(ret); 531 } 532 533int dtls1_client_hello(SSL *s) 534 { 535 unsigned char *buf; 536 unsigned char *p,*d; 537 unsigned int i,j; 538 unsigned long Time,l; 539 SSL_COMP *comp; 540 541 buf=(unsigned char *)s->init_buf->data; 542 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) 543 { 544 if ((s->session == NULL) || 545 (s->session->ssl_version != s->version) || 546 (s->session->not_resumable)) 547 { 548 if (!ssl_get_new_session(s,0)) 549 goto err; 550 } 551 /* else use the pre-loaded session */ 552 553 p=s->s3->client_random; 554 /* if client_random is initialized, reuse it, we are 555 * required to use same upon reply to HelloVerify */ 556 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ; 557 if (i==sizeof(s->s3->client_random)) 558 { 559 Time=(unsigned long)time(NULL); /* Time */ 560 l2n(Time,p); 561 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4); 562 } 563 564 /* Do the message type and length last */ 565 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 566 567 *(p++)=s->version>>8; 568 *(p++)=s->version&0xff; 569 s->client_version=s->version; 570 571 /* Random stuff */ 572 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 573 p+=SSL3_RANDOM_SIZE; 574 575 /* Session ID */ 576 if (s->new_session) 577 i=0; 578 else 579 i=s->session->session_id_length; 580 *(p++)=i; 581 if (i != 0) 582 { 583 if (i > sizeof s->session->session_id) 584 { 585 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 586 goto err; 587 } 588 memcpy(p,s->session->session_id,i); 589 p+=i; 590 } 591 592 /* cookie stuff */ 593 if ( s->d1->cookie_len > sizeof(s->d1->cookie)) 594 { 595 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 596 goto err; 597 } 598 *(p++) = s->d1->cookie_len; 599 memcpy(p, s->d1->cookie, s->d1->cookie_len); 600 p += s->d1->cookie_len; 601 602 /* Ciphers supported */ 603 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0); 604 if (i == 0) 605 { 606 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 607 goto err; 608 } 609 s2n(i,p); 610 p+=i; 611 612 /* COMPRESSION */ 613 if (s->ctx->comp_methods == NULL) 614 j=0; 615 else 616 j=sk_SSL_COMP_num(s->ctx->comp_methods); 617 *(p++)=1+j; 618 for (i=0; i<j; i++) 619 { 620 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 621 *(p++)=comp->id; 622 } 623 *(p++)=0; /* Add the NULL method */ 624 625 l=(p-d); 626 d=buf; 627 628 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l); 629 630 s->state=SSL3_ST_CW_CLNT_HELLO_B; 631 /* number of bytes to write */ 632 s->init_num=p-buf; 633 s->init_off=0; 634 635 /* buffer the message to handle re-xmits */ 636 dtls1_buffer_message(s, 0); 637 } 638 639 /* SSL3_ST_CW_CLNT_HELLO_B */ 640 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 641err: 642 return(-1); 643 } 644 645static int dtls1_get_hello_verify(SSL *s) 646 { 647 int n, al, ok = 0; 648 unsigned char *data; 649 unsigned int cookie_len; 650 651 n=s->method->ssl_get_message(s, 652 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 653 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 654 -1, 655 s->max_cert_list, 656 &ok); 657 658 if (!ok) return((int)n); 659 660 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) 661 { 662 s->d1->send_cookie = 0; 663 s->s3->tmp.reuse_message=1; 664 return(1); 665 } 666 667 data = (unsigned char *)s->init_msg; 668 669 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff))) 670 { 671 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION); 672 s->version=(s->version&0xff00)|data[1]; 673 al = SSL_AD_PROTOCOL_VERSION; 674 goto f_err; 675 } 676 data+=2; 677 678 cookie_len = *(data++); 679 if ( cookie_len > sizeof(s->d1->cookie)) 680 { 681 al=SSL_AD_ILLEGAL_PARAMETER; 682 goto f_err; 683 } 684 685 memcpy(s->d1->cookie, data, cookie_len); 686 s->d1->cookie_len = cookie_len; 687 688 s->d1->send_cookie = 1; 689 return 1; 690 691f_err: 692 ssl3_send_alert(s, SSL3_AL_FATAL, al); 693 return -1; 694 } 695 696int dtls1_send_client_key_exchange(SSL *s) 697 { 698 unsigned char *p,*d; 699 int n; 700 unsigned long l; 701#ifndef OPENSSL_NO_RSA 702 unsigned char *q; 703 EVP_PKEY *pkey=NULL; 704#endif 705#ifndef OPENSSL_NO_KRB5 706 KSSL_ERR kssl_err; 707#endif /* OPENSSL_NO_KRB5 */ 708 709 if (s->state == SSL3_ST_CW_KEY_EXCH_A) 710 { 711 d=(unsigned char *)s->init_buf->data; 712 p= &(d[DTLS1_HM_HEADER_LENGTH]); 713 714 l=s->s3->tmp.new_cipher->algorithms; 715 716 /* Fool emacs indentation */ 717 if (0) {} 718#ifndef OPENSSL_NO_RSA 719 else if (l & SSL_kRSA) 720 { 721 RSA *rsa; 722 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 723 724 if (s->session->sess_cert->peer_rsa_tmp != NULL) 725 rsa=s->session->sess_cert->peer_rsa_tmp; 726 else 727 { 728 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 729 if ((pkey == NULL) || 730 (pkey->type != EVP_PKEY_RSA) || 731 (pkey->pkey.rsa == NULL)) 732 { 733 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 734 goto err; 735 } 736 rsa=pkey->pkey.rsa; 737 EVP_PKEY_free(pkey); 738 } 739 740 tmp_buf[0]=s->client_version>>8; 741 tmp_buf[1]=s->client_version&0xff; 742 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) 743 goto err; 744 745 s->session->master_key_length=sizeof tmp_buf; 746 747 q=p; 748 /* Fix buf for TLS and [incidentally] DTLS */ 749 if (s->version > SSL3_VERSION) 750 p+=2; 751 n=RSA_public_encrypt(sizeof tmp_buf, 752 tmp_buf,p,rsa,RSA_PKCS1_PADDING); 753#ifdef PKCS1_CHECK 754 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++; 755 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70; 756#endif 757 if (n <= 0) 758 { 759 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT); 760 goto err; 761 } 762 763 /* Fix buf for TLS and [incidentally] DTLS */ 764 if (s->version > SSL3_VERSION) 765 { 766 s2n(n,q); 767 n+=2; 768 } 769 770 s->session->master_key_length= 771 s->method->ssl3_enc->generate_master_secret(s, 772 s->session->master_key, 773 tmp_buf,sizeof tmp_buf); 774 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf); 775 } 776#endif 777#ifndef OPENSSL_NO_KRB5 778 else if (l & SSL_kKRB5) 779 { 780 krb5_error_code krb5rc; 781 KSSL_CTX *kssl_ctx = s->kssl_ctx; 782 /* krb5_data krb5_ap_req; */ 783 krb5_data *enc_ticket; 784 krb5_data authenticator, *authp = NULL; 785 EVP_CIPHER_CTX ciph_ctx; 786 EVP_CIPHER *enc = NULL; 787 unsigned char iv[EVP_MAX_IV_LENGTH]; 788 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 789 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH 790 + EVP_MAX_IV_LENGTH]; 791 int padl, outl = sizeof(epms); 792 793 EVP_CIPHER_CTX_init(&ciph_ctx); 794 795#ifdef KSSL_DEBUG 796 printf("ssl3_send_client_key_exchange(%lx & %lx)\n", 797 l, SSL_kKRB5); 798#endif /* KSSL_DEBUG */ 799 800 authp = NULL; 801#ifdef KRB5SENDAUTH 802 if (KRB5SENDAUTH) authp = &authenticator; 803#endif /* KRB5SENDAUTH */ 804 805 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, 806 &kssl_err); 807 enc = kssl_map_enc(kssl_ctx->enctype); 808 if (enc == NULL) 809 goto err; 810#ifdef KSSL_DEBUG 811 { 812 printf("kssl_cget_tkt rtn %d\n", krb5rc); 813 if (krb5rc && kssl_err.text) 814 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 815 } 816#endif /* KSSL_DEBUG */ 817 818 if (krb5rc) 819 { 820 ssl3_send_alert(s,SSL3_AL_FATAL, 821 SSL_AD_HANDSHAKE_FAILURE); 822 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 823 kssl_err.reason); 824 goto err; 825 } 826 827 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ 828 ** in place of RFC 2712 KerberosWrapper, as in: 829 ** 830 ** Send ticket (copy to *p, set n = length) 831 ** n = krb5_ap_req.length; 832 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 833 ** if (krb5_ap_req.data) 834 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 835 ** 836 ** Now using real RFC 2712 KerberosWrapper 837 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) 838 ** Note: 2712 "opaque" types are here replaced 839 ** with a 2-byte length followed by the value. 840 ** Example: 841 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 842 ** Where "xx xx" = length bytes. Shown here with 843 ** optional authenticator omitted. 844 */ 845 846 /* KerberosWrapper.Ticket */ 847 s2n(enc_ticket->length,p); 848 memcpy(p, enc_ticket->data, enc_ticket->length); 849 p+= enc_ticket->length; 850 n = enc_ticket->length + 2; 851 852 /* KerberosWrapper.Authenticator */ 853 if (authp && authp->length) 854 { 855 s2n(authp->length,p); 856 memcpy(p, authp->data, authp->length); 857 p+= authp->length; 858 n+= authp->length + 2; 859 860 free(authp->data); 861 authp->data = NULL; 862 authp->length = 0; 863 } 864 else 865 { 866 s2n(0,p);/* null authenticator length */ 867 n+=2; 868 } 869 870 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0) 871 goto err; 872 873 /* 20010420 VRS. Tried it this way; failed. 874 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 875 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 876 ** kssl_ctx->length); 877 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 878 */ 879 880 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 881 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL, 882 kssl_ctx->key,iv); 883 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf, 884 sizeof tmp_buf); 885 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl); 886 outl += padl; 887 if (outl > sizeof epms) 888 { 889 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 890 goto err; 891 } 892 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 893 894 /* KerberosWrapper.EncryptedPreMasterSecret */ 895 s2n(outl,p); 896 memcpy(p, epms, outl); 897 p+=outl; 898 n+=outl + 2; 899 900 s->session->master_key_length= 901 s->method->ssl3_enc->generate_master_secret(s, 902 s->session->master_key, 903 tmp_buf, sizeof tmp_buf); 904 905 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 906 OPENSSL_cleanse(epms, outl); 907 } 908#endif 909#ifndef OPENSSL_NO_DH 910 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 911 { 912 DH *dh_srvr,*dh_clnt; 913 914 if (s->session->sess_cert->peer_dh_tmp != NULL) 915 dh_srvr=s->session->sess_cert->peer_dh_tmp; 916 else 917 { 918 /* we get them from the cert */ 919 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 920 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 921 goto err; 922 } 923 924 /* generate a new random key */ 925 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL) 926 { 927 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 928 goto err; 929 } 930 if (!DH_generate_key(dh_clnt)) 931 { 932 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 933 goto err; 934 } 935 936 /* use the 'p' output buffer for the DH key, but 937 * make sure to clear it out afterwards */ 938 939 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt); 940 941 if (n <= 0) 942 { 943 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 944 goto err; 945 } 946 947 /* generate master key from the result */ 948 s->session->master_key_length= 949 s->method->ssl3_enc->generate_master_secret(s, 950 s->session->master_key,p,n); 951 /* clean up */ 952 memset(p,0,n); 953 954 /* send off the data */ 955 n=BN_num_bytes(dh_clnt->pub_key); 956 s2n(n,p); 957 BN_bn2bin(dh_clnt->pub_key,p); 958 n+=2; 959 960 DH_free(dh_clnt); 961 962 /* perhaps clean things up a bit EAY EAY EAY EAY*/ 963 } 964#endif 965 else 966 { 967 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 968 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 969 goto err; 970 } 971 972 d = dtls1_set_message_header(s, d, 973 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); 974 /* 975 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 976 l2n3(n,d); 977 l2n(s->d1->handshake_write_seq,d); 978 s->d1->handshake_write_seq++; 979 */ 980 981 s->state=SSL3_ST_CW_KEY_EXCH_B; 982 /* number of bytes to write */ 983 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 984 s->init_off=0; 985 986 /* buffer the message to handle re-xmits */ 987 dtls1_buffer_message(s, 0); 988 } 989 990 /* SSL3_ST_CW_KEY_EXCH_B */ 991 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 992err: 993 return(-1); 994 } 995 996int dtls1_send_client_verify(SSL *s) 997 { 998 unsigned char *p,*d; 999 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1000 EVP_PKEY *pkey; 1001#ifndef OPENSSL_NO_RSA 1002 unsigned u=0; 1003#endif 1004 unsigned long n; 1005#ifndef OPENSSL_NO_DSA 1006 int j; 1007#endif 1008 1009 if (s->state == SSL3_ST_CW_CERT_VRFY_A) 1010 { 1011 d=(unsigned char *)s->init_buf->data; 1012 p= &(d[DTLS1_HM_HEADER_LENGTH]); 1013 pkey=s->cert->key->privatekey; 1014 1015 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2), 1016 &(data[MD5_DIGEST_LENGTH])); 1017 1018#ifndef OPENSSL_NO_RSA 1019 if (pkey->type == EVP_PKEY_RSA) 1020 { 1021 s->method->ssl3_enc->cert_verify_mac(s, 1022 &(s->s3->finish_dgst1),&(data[0])); 1023 if (RSA_sign(NID_md5_sha1, data, 1024 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, 1025 &(p[2]), &u, pkey->pkey.rsa) <= 0 ) 1026 { 1027 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB); 1028 goto err; 1029 } 1030 s2n(u,p); 1031 n=u+2; 1032 } 1033 else 1034#endif 1035#ifndef OPENSSL_NO_DSA 1036 if (pkey->type == EVP_PKEY_DSA) 1037 { 1038 if (!DSA_sign(pkey->save_type, 1039 &(data[MD5_DIGEST_LENGTH]), 1040 SHA_DIGEST_LENGTH,&(p[2]), 1041 (unsigned int *)&j,pkey->pkey.dsa)) 1042 { 1043 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB); 1044 goto err; 1045 } 1046 s2n(j,p); 1047 n=j+2; 1048 } 1049 else 1050#endif 1051 { 1052 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR); 1053 goto err; 1054 } 1055 1056 d = dtls1_set_message_header(s, d, 1057 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ; 1058 1059 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH; 1060 s->init_off=0; 1061 1062 /* buffer the message to handle re-xmits */ 1063 dtls1_buffer_message(s, 0); 1064 1065 s->state = SSL3_ST_CW_CERT_VRFY_B; 1066 } 1067 1068 /* s->state = SSL3_ST_CW_CERT_VRFY_B */ 1069 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1070err: 1071 return(-1); 1072 } 1073 1074int dtls1_send_client_certificate(SSL *s) 1075 { 1076 X509 *x509=NULL; 1077 EVP_PKEY *pkey=NULL; 1078 int i; 1079 unsigned long l; 1080 1081 if (s->state == SSL3_ST_CW_CERT_A) 1082 { 1083 if ((s->cert == NULL) || 1084 (s->cert->key->x509 == NULL) || 1085 (s->cert->key->privatekey == NULL)) 1086 s->state=SSL3_ST_CW_CERT_B; 1087 else 1088 s->state=SSL3_ST_CW_CERT_C; 1089 } 1090 1091 /* We need to get a client cert */ 1092 if (s->state == SSL3_ST_CW_CERT_B) 1093 { 1094 /* If we get an error, we need to 1095 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 1096 * We then get retied later */ 1097 i=0; 1098 i = ssl_do_client_cert_cb(s, &x509, &pkey); 1099 if (i < 0) 1100 { 1101 s->rwstate=SSL_X509_LOOKUP; 1102 return(-1); 1103 } 1104 s->rwstate=SSL_NOTHING; 1105 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) 1106 { 1107 s->state=SSL3_ST_CW_CERT_B; 1108 if ( !SSL_use_certificate(s,x509) || 1109 !SSL_use_PrivateKey(s,pkey)) 1110 i=0; 1111 } 1112 else if (i == 1) 1113 { 1114 i=0; 1115 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 1116 } 1117 1118 if (x509 != NULL) X509_free(x509); 1119 if (pkey != NULL) EVP_PKEY_free(pkey); 1120 if (i == 0) 1121 { 1122 if (s->version == SSL3_VERSION) 1123 { 1124 s->s3->tmp.cert_req=0; 1125 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE); 1126 return(1); 1127 } 1128 else 1129 { 1130 s->s3->tmp.cert_req=2; 1131 } 1132 } 1133 1134 /* Ok, we have a cert */ 1135 s->state=SSL3_ST_CW_CERT_C; 1136 } 1137 1138 if (s->state == SSL3_ST_CW_CERT_C) 1139 { 1140 s->state=SSL3_ST_CW_CERT_D; 1141 l=dtls1_output_cert_chain(s, 1142 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509); 1143 s->init_num=(int)l; 1144 s->init_off=0; 1145 1146 /* set header called by dtls1_output_cert_chain() */ 1147 1148 /* buffer the message to handle re-xmits */ 1149 dtls1_buffer_message(s, 0); 1150 } 1151 /* SSL3_ST_CW_CERT_D */ 1152 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1153 } 1154 1155 1156