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 127 128 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) 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=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 ssl3_init_finished_mac(s); 218 219 s->state=SSL3_ST_CW_CLNT_HELLO_A; 220 s->ctx->stats.sess_connect++; 221 s->init_num=0; 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 ret=dtls1_client_hello(s); 229 if (ret <= 0) goto end; 230 231 if ( s->d1->send_cookie) 232 { 233 s->state=SSL3_ST_CW_FLUSH; 234 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A; 235 } 236 else 237 s->state=SSL3_ST_CR_SRVR_HELLO_A; 238 239 s->init_num=0; 240 241 /* turn on buffering for the next lot of output */ 242 if (s->bbio != s->wbio) 243 s->wbio=BIO_push(s->bbio,s->wbio); 244 245 break; 246 247 case SSL3_ST_CR_SRVR_HELLO_A: 248 case SSL3_ST_CR_SRVR_HELLO_B: 249 ret=ssl3_get_server_hello(s); 250 if (ret <= 0) goto end; 251 else 252 { 253 if (s->hit) 254 s->state=SSL3_ST_CR_FINISHED_A; 255 else 256 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 257 } 258 s->init_num=0; 259 break; 260 261 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 262 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 263 264 ret = dtls1_get_hello_verify(s); 265 if ( ret <= 0) 266 goto end; 267 if ( s->d1->send_cookie) /* start again, with a cookie */ 268 s->state=SSL3_ST_CW_CLNT_HELLO_A; 269 else 270 s->state = SSL3_ST_CR_CERT_A; 271 s->init_num = 0; 272 break; 273 274 case SSL3_ST_CR_CERT_A: 275 case SSL3_ST_CR_CERT_B: 276 /* Check if it is anon DH */ 277 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) 278 { 279 ret=ssl3_get_server_certificate(s); 280 if (ret <= 0) goto end; 281 } 282 else 283 skip=1; 284 s->state=SSL3_ST_CR_KEY_EXCH_A; 285 s->init_num=0; 286 break; 287 288 case SSL3_ST_CR_KEY_EXCH_A: 289 case SSL3_ST_CR_KEY_EXCH_B: 290 ret=ssl3_get_key_exchange(s); 291 if (ret <= 0) goto end; 292 s->state=SSL3_ST_CR_CERT_REQ_A; 293 s->init_num=0; 294 295 /* at this point we check that we have the 296 * required stuff from the server */ 297 if (!ssl3_check_cert_and_algorithm(s)) 298 { 299 ret= -1; 300 goto end; 301 } 302 break; 303 304 case SSL3_ST_CR_CERT_REQ_A: 305 case SSL3_ST_CR_CERT_REQ_B: 306 ret=ssl3_get_certificate_request(s); 307 if (ret <= 0) goto end; 308 s->state=SSL3_ST_CR_SRVR_DONE_A; 309 s->init_num=0; 310 break; 311 312 case SSL3_ST_CR_SRVR_DONE_A: 313 case SSL3_ST_CR_SRVR_DONE_B: 314 ret=ssl3_get_server_done(s); 315 if (ret <= 0) goto end; 316 if (s->s3->tmp.cert_req) 317 s->state=SSL3_ST_CW_CERT_A; 318 else 319 s->state=SSL3_ST_CW_KEY_EXCH_A; 320 s->init_num=0; 321 322 break; 323 324 case SSL3_ST_CW_CERT_A: 325 case SSL3_ST_CW_CERT_B: 326 case SSL3_ST_CW_CERT_C: 327 case SSL3_ST_CW_CERT_D: 328 ret=dtls1_send_client_certificate(s); 329 if (ret <= 0) goto end; 330 s->state=SSL3_ST_CW_KEY_EXCH_A; 331 s->init_num=0; 332 break; 333 334 case SSL3_ST_CW_KEY_EXCH_A: 335 case SSL3_ST_CW_KEY_EXCH_B: 336 ret=dtls1_send_client_key_exchange(s); 337 if (ret <= 0) goto end; 338 l=s->s3->tmp.new_cipher->algorithms; 339 /* EAY EAY EAY need to check for DH fix cert 340 * sent back */ 341 /* For TLS, cert_req is set to 2, so a cert chain 342 * of nothing is sent, but no verify packet is sent */ 343 if (s->s3->tmp.cert_req == 1) 344 { 345 s->state=SSL3_ST_CW_CERT_VRFY_A; 346 } 347 else 348 { 349 s->state=SSL3_ST_CW_CHANGE_A; 350 s->s3->change_cipher_spec=0; 351 } 352 353 s->init_num=0; 354 break; 355 356 case SSL3_ST_CW_CERT_VRFY_A: 357 case SSL3_ST_CW_CERT_VRFY_B: 358 ret=dtls1_send_client_verify(s); 359 if (ret <= 0) goto end; 360 s->state=SSL3_ST_CW_CHANGE_A; 361 s->init_num=0; 362 s->s3->change_cipher_spec=0; 363 break; 364 365 case SSL3_ST_CW_CHANGE_A: 366 case SSL3_ST_CW_CHANGE_B: 367 ret=dtls1_send_change_cipher_spec(s, 368 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B); 369 if (ret <= 0) goto end; 370 s->state=SSL3_ST_CW_FINISHED_A; 371 s->init_num=0; 372 373 s->session->cipher=s->s3->tmp.new_cipher; 374 #ifdef OPENSSL_NO_COMP 375 s->session->compress_meth=0; 376 #else 377 if (s->s3->tmp.new_compression == NULL) 378 s->session->compress_meth=0; 379 else 380 s->session->compress_meth= 381 s->s3->tmp.new_compression->id; 382 #endif 383 if (!s->method->ssl3_enc->setup_key_block(s)) 384 { 385 ret= -1; 386 goto end; 387 } 388 389 if (!s->method->ssl3_enc->change_cipher_state(s, 390 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 391 { 392 ret= -1; 393 goto end; 394 } 395 396 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 397 break; 398 399 case SSL3_ST_CW_FINISHED_A: 400 case SSL3_ST_CW_FINISHED_B: 401 ret=dtls1_send_finished(s, 402 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B, 403 s->method->ssl3_enc->client_finished_label, 404 s->method->ssl3_enc->client_finished_label_len); 405 if (ret <= 0) goto end; 406 s->state=SSL3_ST_CW_FLUSH; 407 408 /* clear flags */ 409 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER; 410 if (s->hit) 411 { 412 s->s3->tmp.next_state=SSL_ST_OK; 413 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) 414 { 415 s->state=SSL_ST_OK; 416 s->s3->flags|=SSL3_FLAGS_POP_BUFFER; 417 s->s3->delay_buf_pop_ret=0; 418 } 419 } 420 else 421 { 422 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A; 423 } 424 s->init_num=0; 425 break; 426 427 case SSL3_ST_CR_FINISHED_A: 428 case SSL3_ST_CR_FINISHED_B: 429 430 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A, 431 SSL3_ST_CR_FINISHED_B); 432 if (ret <= 0) goto end; 433 434 if (s->hit) 435 s->state=SSL3_ST_CW_CHANGE_A; 436 else 437 s->state=SSL_ST_OK; 438 s->init_num=0; 439 break; 440 441 case SSL3_ST_CW_FLUSH: 442 /* number of bytes to be flushed */ 443 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL); 444 if (num1 > 0) 445 { 446 s->rwstate=SSL_WRITING; 447 num1=BIO_flush(s->wbio); 448 if (num1 <= 0) { ret= -1; goto end; } 449 s->rwstate=SSL_NOTHING; 450 } 451 452 s->state=s->s3->tmp.next_state; 453 break; 454 455 case SSL_ST_OK: 456 /* clean a few things up */ 457 ssl3_cleanup_key_block(s); 458 459 #if 0 460 if (s->init_buf != NULL) 461 { 462 BUF_MEM_free(s->init_buf); 463 s->init_buf=NULL; 464 } 465 #endif 466 467 /* If we are not 'joining' the last two packets, 468 * remove the buffering now */ 469 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 470 ssl_free_wbio_buffer(s); 471 /* else do it later in ssl3_write */ 472 473 s->init_num=0; 474 s->new_session=0; 475 476 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT); 477 if (s->hit) s->ctx->stats.sess_hit++; 478 479 ret=1; 480 /* s->server=0; */ 481 s->handshake_func=dtls1_connect; 482 s->ctx->stats.sess_connect_good++; 483 484 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 485 486 /* done with handshaking */ 487 s->d1->handshake_read_seq = 0; 488 goto end; 489 /* break; */ 490 491 default: 492 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE); 493 ret= -1; 494 goto end; 495 /* break; */ 496 } 497 498 /* did we do anything */ 499 if (!s->s3->tmp.reuse_message && !skip) 500 { 501 if (s->debug) 502 { 503 if ((ret=BIO_flush(s->wbio)) <= 0) 504 goto end; 505 } 506 507 if ((cb != NULL) && (s->state != state)) 508 { 509 new_state=s->state; 510 s->state=state; 511 cb(s,SSL_CB_CONNECT_LOOP,1); 512 s->state=new_state; 513 } 514 } 515 skip=0; 516 } 517 end: 518 s->in_handshake--; 519 if (buf != NULL) 520 BUF_MEM_free(buf); 521 if (cb != NULL) 522 cb(s,SSL_CB_CONNECT_EXIT,ret); 523 return(ret); 524 } 525 526 int dtls1_client_hello(SSL *s) 527 { 528 unsigned char *buf; 529 unsigned char *p,*d; 530 unsigned int i,j; 531 unsigned long Time,l; 532 SSL_COMP *comp; 533 534 buf=(unsigned char *)s->init_buf->data; 535 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) 536 { 537 if ((s->session == NULL) || 538 (s->session->ssl_version != s->version) || 539 (s->session->not_resumable)) 540 { 541 if (!ssl_get_new_session(s,0)) 542 goto err; 543 } 544 /* else use the pre-loaded session */ 545 546 p=s->s3->client_random; 547 Time=time(NULL); /* Time */ 548 l2n(Time,p); 549 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time)); 550 551 /* Do the message type and length last */ 552 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 553 554 *(p++)=s->version>>8; 555 *(p++)=s->version&0xff; 556 s->client_version=s->version; 557 558 /* Random stuff */ 559 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 560 p+=SSL3_RANDOM_SIZE; 561 562 /* Session ID */ 563 if (s->new_session) 564 i=0; 565 else 566 i=s->session->session_id_length; 567 *(p++)=i; 568 if (i != 0) 569 { 570 if (i > sizeof s->session->session_id) 571 { 572 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 573 goto err; 574 } 575 memcpy(p,s->session->session_id,i); 576 p+=i; 577 } 578 579 /* cookie stuff */ 580 if ( s->d1->cookie_len > sizeof(s->d1->cookie)) 581 { 582 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 583 goto err; 584 } 585 *(p++) = s->d1->cookie_len; 586 memcpy(p, s->d1->cookie, s->d1->cookie_len); 587 p += s->d1->cookie_len; 588 589 /* Ciphers supported */ 590 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0); 591 if (i == 0) 592 { 593 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 594 goto err; 595 } 596 s2n(i,p); 597 p+=i; 598 599 /* COMPRESSION */ 600 if (s->ctx->comp_methods == NULL) 601 j=0; 602 else 603 j=sk_SSL_COMP_num(s->ctx->comp_methods); 604 *(p++)=1+j; 605 for (i=0; i<j; i++) 606 { 607 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 608 *(p++)=comp->id; 609 } 610 *(p++)=0; /* Add the NULL method */ 611 612 l=(p-d); 613 d=buf; 614 615 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l); 616 617 s->state=SSL3_ST_CW_CLNT_HELLO_B; 618 /* number of bytes to write */ 619 s->init_num=p-buf; 620 s->init_off=0; 621 622 /* buffer the message to handle re-xmits */ 623 dtls1_buffer_message(s, 0); 624 } 625 626 /* SSL3_ST_CW_CLNT_HELLO_B */ 627 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 628 err: 629 return(-1); 630 } 631 632 static int dtls1_get_hello_verify(SSL *s) 633 { 634 int n, al, ok = 0; 635 unsigned char *data; 636 unsigned int cookie_len; 637 638 n=s->method->ssl_get_message(s, 639 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 640 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 641 -1, 642 s->max_cert_list, 643 &ok); 644 645 if (!ok) return((int)n); 646 647 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) 648 { 649 s->d1->send_cookie = 0; 650 s->s3->tmp.reuse_message=1; 651 return(1); 652 } 653 654 data = (unsigned char *)s->init_msg; 655 656 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff))) 657 { 658 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION); 659 s->version=(s->version&0xff00)|data[1]; 660 al = SSL_AD_PROTOCOL_VERSION; 661 goto f_err; 662 } 663 data+=2; 664 665 cookie_len = *(data++); 666 if ( cookie_len > sizeof(s->d1->cookie)) 667 { 668 al=SSL_AD_ILLEGAL_PARAMETER; 669 goto f_err; 670 } 671 672 memcpy(s->d1->cookie, data, cookie_len); 673 s->d1->cookie_len = cookie_len; 674 675 s->d1->send_cookie = 1; 676 return 1; 677 678 f_err: 679 ssl3_send_alert(s, SSL3_AL_FATAL, al); 680 return -1; 681 } 682 683 int dtls1_send_client_key_exchange(SSL *s) 684 { 685 unsigned char *p,*d; 686 int n; 687 unsigned long l; 688 #ifndef OPENSSL_NO_RSA 689 unsigned char *q; 690 EVP_PKEY *pkey=NULL; 691 #endif 692 #ifndef OPENSSL_NO_KRB5 693 KSSL_ERR kssl_err; 694 #endif /* OPENSSL_NO_KRB5 */ 695 696 if (s->state == SSL3_ST_CW_KEY_EXCH_A) 697 { 698 d=(unsigned char *)s->init_buf->data; 699 p= &(d[DTLS1_HM_HEADER_LENGTH]); 700 701 l=s->s3->tmp.new_cipher->algorithms; 702 703 /* Fool emacs indentation */ 704 if (0) {} 705 #ifndef OPENSSL_NO_RSA 706 else if (l & SSL_kRSA) 707 { 708 RSA *rsa; 709 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 710 711 if (s->session->sess_cert->peer_rsa_tmp != NULL) 712 rsa=s->session->sess_cert->peer_rsa_tmp; 713 else 714 { 715 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 716 if ((pkey == NULL) || 717 (pkey->type != EVP_PKEY_RSA) || 718 (pkey->pkey.rsa == NULL)) 719 { 720 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 721 goto err; 722 } 723 rsa=pkey->pkey.rsa; 724 EVP_PKEY_free(pkey); 725 } 726 727 tmp_buf[0]=s->client_version>>8; 728 tmp_buf[1]=s->client_version&0xff; 729 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) 730 goto err; 731 732 s->session->master_key_length=sizeof tmp_buf; 733 734 q=p; 735 /* Fix buf for TLS and beyond */ 736 if (s->version > SSL3_VERSION) 737 p+=2; 738 n=RSA_public_encrypt(sizeof tmp_buf, 739 tmp_buf,p,rsa,RSA_PKCS1_PADDING); 740 #ifdef PKCS1_CHECK 741 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++; 742 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70; 743 #endif 744 if (n <= 0) 745 { 746 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT); 747 goto err; 748 } 749 750 /* Fix buf for TLS and beyond */ 751 if (s->version > SSL3_VERSION) 752 { 753 s2n(n,q); 754 n+=2; 755 } 756 757 s->session->master_key_length= 758 s->method->ssl3_enc->generate_master_secret(s, 759 s->session->master_key, 760 tmp_buf,sizeof tmp_buf); 761 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf); 762 } 763 #endif 764 #ifndef OPENSSL_NO_KRB5 765 else if (l & SSL_kKRB5) 766 { 767 krb5_error_code krb5rc; 768 KSSL_CTX *kssl_ctx = s->kssl_ctx; 769 /* krb5_data krb5_ap_req; */ 770 krb5_data *enc_ticket; 771 krb5_data authenticator, *authp = NULL; 772 EVP_CIPHER_CTX ciph_ctx; 773 EVP_CIPHER *enc = NULL; 774 unsigned char iv[EVP_MAX_IV_LENGTH]; 775 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 776 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH 777 + EVP_MAX_IV_LENGTH]; 778 int padl, outl = sizeof(epms); 779 780 EVP_CIPHER_CTX_init(&ciph_ctx); 781 782 #ifdef KSSL_DEBUG 783 printf("ssl3_send_client_key_exchange(%lx & %lx)\n", 784 l, SSL_kKRB5); 785 #endif /* KSSL_DEBUG */ 786 787 authp = NULL; 788 #ifdef KRB5SENDAUTH 789 if (KRB5SENDAUTH) authp = &authenticator; 790 #endif /* KRB5SENDAUTH */ 791 792 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, 793 &kssl_err); 794 enc = kssl_map_enc(kssl_ctx->enctype); 795 if (enc == NULL) 796 goto err; 797 #ifdef KSSL_DEBUG 798 { 799 printf("kssl_cget_tkt rtn %d\n", krb5rc); 800 if (krb5rc && kssl_err.text) 801 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 802 } 803 #endif /* KSSL_DEBUG */ 804 805 if (krb5rc) 806 { 807 ssl3_send_alert(s,SSL3_AL_FATAL, 808 SSL_AD_HANDSHAKE_FAILURE); 809 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 810 kssl_err.reason); 811 goto err; 812 } 813 814 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ 815 ** in place of RFC 2712 KerberosWrapper, as in: 816 ** 817 ** Send ticket (copy to *p, set n = length) 818 ** n = krb5_ap_req.length; 819 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 820 ** if (krb5_ap_req.data) 821 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 822 ** 823 ** Now using real RFC 2712 KerberosWrapper 824 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) 825 ** Note: 2712 "opaque" types are here replaced 826 ** with a 2-byte length followed by the value. 827 ** Example: 828 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 829 ** Where "xx xx" = length bytes. Shown here with 830 ** optional authenticator omitted. 831 */ 832 833 /* KerberosWrapper.Ticket */ 834 s2n(enc_ticket->length,p); 835 memcpy(p, enc_ticket->data, enc_ticket->length); 836 p+= enc_ticket->length; 837 n = enc_ticket->length + 2; 838 839 /* KerberosWrapper.Authenticator */ 840 if (authp && authp->length) 841 { 842 s2n(authp->length,p); 843 memcpy(p, authp->data, authp->length); 844 p+= authp->length; 845 n+= authp->length + 2; 846 847 free(authp->data); 848 authp->data = NULL; 849 authp->length = 0; 850 } 851 else 852 { 853 s2n(0,p);/* null authenticator length */ 854 n+=2; 855 } 856 857 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0) 858 goto err; 859 860 /* 20010420 VRS. Tried it this way; failed. 861 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 862 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 863 ** kssl_ctx->length); 864 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 865 */ 866 867 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 868 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL, 869 kssl_ctx->key,iv); 870 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf, 871 sizeof tmp_buf); 872 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl); 873 outl += padl; 874 if (outl > sizeof epms) 875 { 876 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 877 goto err; 878 } 879 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 880 881 /* KerberosWrapper.EncryptedPreMasterSecret */ 882 s2n(outl,p); 883 memcpy(p, epms, outl); 884 p+=outl; 885 n+=outl + 2; 886 887 s->session->master_key_length= 888 s->method->ssl3_enc->generate_master_secret(s, 889 s->session->master_key, 890 tmp_buf, sizeof tmp_buf); 891 892 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 893 OPENSSL_cleanse(epms, outl); 894 } 895 #endif 896 #ifndef OPENSSL_NO_DH 897 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 898 { 899 DH *dh_srvr,*dh_clnt; 900 901 if (s->session->sess_cert->peer_dh_tmp != NULL) 902 dh_srvr=s->session->sess_cert->peer_dh_tmp; 903 else 904 { 905 /* we get them from the cert */ 906 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 907 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 908 goto err; 909 } 910 911 /* generate a new random key */ 912 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL) 913 { 914 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 915 goto err; 916 } 917 if (!DH_generate_key(dh_clnt)) 918 { 919 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 920 goto err; 921 } 922 923 /* use the 'p' output buffer for the DH key, but 924 * make sure to clear it out afterwards */ 925 926 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt); 927 928 if (n <= 0) 929 { 930 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 931 goto err; 932 } 933 934 /* generate master key from the result */ 935 s->session->master_key_length= 936 s->method->ssl3_enc->generate_master_secret(s, 937 s->session->master_key,p,n); 938 /* clean up */ 939 memset(p,0,n); 940 941 /* send off the data */ 942 n=BN_num_bytes(dh_clnt->pub_key); 943 s2n(n,p); 944 BN_bn2bin(dh_clnt->pub_key,p); 945 n+=2; 946 947 DH_free(dh_clnt); 948 949 /* perhaps clean things up a bit EAY EAY EAY EAY*/ 950 } 951 #endif 952 else 953 { 954 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 955 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 956 goto err; 957 } 958 959 d = dtls1_set_message_header(s, d, 960 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); 961 /* 962 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 963 l2n3(n,d); 964 l2n(s->d1->handshake_write_seq,d); 965 s->d1->handshake_write_seq++; 966 */ 967 968 s->state=SSL3_ST_CW_KEY_EXCH_B; 969 /* number of bytes to write */ 970 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 971 s->init_off=0; 972 973 /* buffer the message to handle re-xmits */ 974 dtls1_buffer_message(s, 0); 975 } 976 977 /* SSL3_ST_CW_KEY_EXCH_B */ 978 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 979 err: 980 return(-1); 981 } 982 983 int dtls1_send_client_verify(SSL *s) 984 { 985 unsigned char *p,*d; 986 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 987 EVP_PKEY *pkey; 988 #ifndef OPENSSL_NO_RSA 989 unsigned u=0; 990 #endif 991 unsigned long n; 992 #ifndef OPENSSL_NO_DSA 993 int j; 994 #endif 995 996 if (s->state == SSL3_ST_CW_CERT_VRFY_A) 997 { 998 d=(unsigned char *)s->init_buf->data; 999 p= &(d[DTLS1_HM_HEADER_LENGTH]); 1000 pkey=s->cert->key->privatekey; 1001 1002 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2), 1003 &(data[MD5_DIGEST_LENGTH])); 1004 1005 #ifndef OPENSSL_NO_RSA 1006 if (pkey->type == EVP_PKEY_RSA) 1007 { 1008 s->method->ssl3_enc->cert_verify_mac(s, 1009 &(s->s3->finish_dgst1),&(data[0])); 1010 if (RSA_sign(NID_md5_sha1, data, 1011 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, 1012 &(p[2]), &u, pkey->pkey.rsa) <= 0 ) 1013 { 1014 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB); 1015 goto err; 1016 } 1017 s2n(u,p); 1018 n=u+2; 1019 } 1020 else 1021 #endif 1022 #ifndef OPENSSL_NO_DSA 1023 if (pkey->type == EVP_PKEY_DSA) 1024 { 1025 if (!DSA_sign(pkey->save_type, 1026 &(data[MD5_DIGEST_LENGTH]), 1027 SHA_DIGEST_LENGTH,&(p[2]), 1028 (unsigned int *)&j,pkey->pkey.dsa)) 1029 { 1030 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB); 1031 goto err; 1032 } 1033 s2n(j,p); 1034 n=j+2; 1035 } 1036 else 1037 #endif 1038 { 1039 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR); 1040 goto err; 1041 } 1042 1043 d = dtls1_set_message_header(s, d, 1044 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ; 1045 1046 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH; 1047 s->init_off=0; 1048 1049 /* buffer the message to handle re-xmits */ 1050 dtls1_buffer_message(s, 0); 1051 1052 s->state = SSL3_ST_CW_CERT_VRFY_B; 1053 } 1054 1055 /* s->state = SSL3_ST_CW_CERT_VRFY_B */ 1056 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1057 err: 1058 return(-1); 1059 } 1060 1061 int dtls1_send_client_certificate(SSL *s) 1062 { 1063 X509 *x509=NULL; 1064 EVP_PKEY *pkey=NULL; 1065 int i; 1066 unsigned long l; 1067 1068 if (s->state == SSL3_ST_CW_CERT_A) 1069 { 1070 if ((s->cert == NULL) || 1071 (s->cert->key->x509 == NULL) || 1072 (s->cert->key->privatekey == NULL)) 1073 s->state=SSL3_ST_CW_CERT_B; 1074 else 1075 s->state=SSL3_ST_CW_CERT_C; 1076 } 1077 1078 /* We need to get a client cert */ 1079 if (s->state == SSL3_ST_CW_CERT_B) 1080 { 1081 /* If we get an error, we need to 1082 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 1083 * We then get retied later */ 1084 i=0; 1085 if (s->ctx->client_cert_cb != NULL) 1086 i=s->ctx->client_cert_cb(s,&(x509),&(pkey)); 1087 if (i < 0) 1088 { 1089 s->rwstate=SSL_X509_LOOKUP; 1090 return(-1); 1091 } 1092 s->rwstate=SSL_NOTHING; 1093 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) 1094 { 1095 s->state=SSL3_ST_CW_CERT_B; 1096 if ( !SSL_use_certificate(s,x509) || 1097 !SSL_use_PrivateKey(s,pkey)) 1098 i=0; 1099 } 1100 else if (i == 1) 1101 { 1102 i=0; 1103 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 1104 } 1105 1106 if (x509 != NULL) X509_free(x509); 1107 if (pkey != NULL) EVP_PKEY_free(pkey); 1108 if (i == 0) 1109 { 1110 if (s->version == SSL3_VERSION) 1111 { 1112 s->s3->tmp.cert_req=0; 1113 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE); 1114 return(1); 1115 } 1116 else 1117 { 1118 s->s3->tmp.cert_req=2; 1119 } 1120 } 1121 1122 /* Ok, we have a cert */ 1123 s->state=SSL3_ST_CW_CERT_C; 1124 } 1125 1126 if (s->state == SSL3_ST_CW_CERT_C) 1127 { 1128 s->state=SSL3_ST_CW_CERT_D; 1129 l=dtls1_output_cert_chain(s, 1130 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509); 1131 s->init_num=(int)l; 1132 s->init_off=0; 1133 1134 /* set header called by dtls1_output_cert_chain() */ 1135 1136 /* buffer the message to handle re-xmits */ 1137 dtls1_buffer_message(s, 0); 1138 } 1139 /* SSL3_ST_CW_CERT_D */ 1140 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1141 } 1142 1143 1144