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) 1999-2007 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * openssl-core@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#ifndef OPENSSL_NO_KRB5 119#include "kssl_lcl.h" 120#endif 121#include <openssl/buffer.h> 122#include <openssl/rand.h> 123#include <openssl/objects.h> 124#include <openssl/evp.h> 125#include <openssl/md5.h> 126#include <openssl/bn.h> 127#ifndef OPENSSL_NO_DH 128#include <openssl/dh.h> 129#endif 130 131static const SSL_METHOD *dtls1_get_client_method(int ver); 132static int dtls1_get_hello_verify(SSL *s); 133 134static const SSL_METHOD *dtls1_get_client_method(int ver) 135 { 136 if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER) 137 return(DTLSv1_client_method()); 138 else 139 return(NULL); 140 } 141 142IMPLEMENT_dtls1_meth_func(DTLSv1_client_method, 143 ssl_undefined_function, 144 dtls1_connect, 145 dtls1_get_client_method) 146 147int dtls1_connect(SSL *s) 148 { 149 BUF_MEM *buf=NULL; 150 unsigned long Time=(unsigned long)time(NULL); 151 void (*cb)(const SSL *ssl,int type,int val)=NULL; 152 int ret= -1; 153 int new_state,state,skip=0; 154#ifndef OPENSSL_NO_SCTP 155 unsigned char sctpauthkey[64]; 156 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; 157#endif 158 159 RAND_add(&Time,sizeof(Time),0); 160 ERR_clear_error(); 161 clear_sys_error(); 162 163 if (s->info_callback != NULL) 164 cb=s->info_callback; 165 else if (s->ctx->info_callback != NULL) 166 cb=s->ctx->info_callback; 167 168 s->in_handshake++; 169 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 170 171#ifndef OPENSSL_NO_SCTP 172 /* Notify SCTP BIO socket to enter handshake 173 * mode and prevent stream identifier other 174 * than 0. Will be ignored if no SCTP is used. 175 */ 176 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL); 177#endif 178 179#ifndef OPENSSL_NO_HEARTBEATS 180 /* If we're awaiting a HeartbeatResponse, pretend we 181 * already got and don't await it anymore, because 182 * Heartbeats don't make sense during handshakes anyway. 183 */ 184 if (s->tlsext_hb_pending) 185 { 186 dtls1_stop_timer(s); 187 s->tlsext_hb_pending = 0; 188 s->tlsext_hb_seq++; 189 } 190#endif 191 192 for (;;) 193 { 194 state=s->state; 195 196 switch(s->state) 197 { 198 case SSL_ST_RENEGOTIATE: 199 s->renegotiate=1; 200 s->state=SSL_ST_CONNECT; 201 s->ctx->stats.sess_connect_renegotiate++; 202 /* break */ 203 case SSL_ST_BEFORE: 204 case SSL_ST_CONNECT: 205 case SSL_ST_BEFORE|SSL_ST_CONNECT: 206 case SSL_ST_OK|SSL_ST_CONNECT: 207 208 s->server=0; 209 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 210 211 if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) && 212 (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00)) 213 { 214 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR); 215 ret = -1; 216 goto end; 217 } 218 219 /* s->version=SSL3_VERSION; */ 220 s->type=SSL_ST_CONNECT; 221 222 if (s->init_buf == NULL) 223 { 224 if ((buf=BUF_MEM_new()) == NULL) 225 { 226 ret= -1; 227 goto end; 228 } 229 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 230 { 231 ret= -1; 232 goto end; 233 } 234 s->init_buf=buf; 235 buf=NULL; 236 } 237 238 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } 239 240 /* setup buffing BIO */ 241 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; } 242 243 /* don't push the buffering BIO quite yet */ 244 245 s->state=SSL3_ST_CW_CLNT_HELLO_A; 246 s->ctx->stats.sess_connect++; 247 s->init_num=0; 248 /* mark client_random uninitialized */ 249 memset(s->s3->client_random,0,sizeof(s->s3->client_random)); 250 s->d1->send_cookie = 0; 251 s->hit = 0; 252 break; 253 254#ifndef OPENSSL_NO_SCTP 255 case DTLS1_SCTP_ST_CR_READ_SOCK: 256 257 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) 258 { 259 s->s3->in_read_app_data=2; 260 s->rwstate=SSL_READING; 261 BIO_clear_retry_flags(SSL_get_rbio(s)); 262 BIO_set_retry_read(SSL_get_rbio(s)); 263 ret = -1; 264 goto end; 265 } 266 267 s->state=s->s3->tmp.next_state; 268 break; 269 270 case DTLS1_SCTP_ST_CW_WRITE_SOCK: 271 /* read app data until dry event */ 272 273 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 274 if (ret < 0) goto end; 275 276 if (ret == 0) 277 { 278 s->s3->in_read_app_data=2; 279 s->rwstate=SSL_READING; 280 BIO_clear_retry_flags(SSL_get_rbio(s)); 281 BIO_set_retry_read(SSL_get_rbio(s)); 282 ret = -1; 283 goto end; 284 } 285 286 s->state=s->d1->next_state; 287 break; 288#endif 289 290 case SSL3_ST_CW_CLNT_HELLO_A: 291 case SSL3_ST_CW_CLNT_HELLO_B: 292 293 s->shutdown=0; 294 295 /* every DTLS ClientHello resets Finished MAC */ 296 ssl3_init_finished_mac(s); 297 298 dtls1_start_timer(s); 299 ret=dtls1_client_hello(s); 300 if (ret <= 0) goto end; 301 302 if ( s->d1->send_cookie) 303 { 304 s->state=SSL3_ST_CW_FLUSH; 305 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A; 306 } 307 else 308 s->state=SSL3_ST_CR_SRVR_HELLO_A; 309 310 s->init_num=0; 311 312#ifndef OPENSSL_NO_SCTP 313 /* Disable buffering for SCTP */ 314 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) 315 { 316#endif 317 /* turn on buffering for the next lot of output */ 318 if (s->bbio != s->wbio) 319 s->wbio=BIO_push(s->bbio,s->wbio); 320#ifndef OPENSSL_NO_SCTP 321 } 322#endif 323 324 break; 325 326 case SSL3_ST_CR_SRVR_HELLO_A: 327 case SSL3_ST_CR_SRVR_HELLO_B: 328 ret=ssl3_get_server_hello(s); 329 if (ret <= 0) goto end; 330 else 331 { 332 if (s->hit) 333 { 334#ifndef OPENSSL_NO_SCTP 335 /* Add new shared key for SCTP-Auth, 336 * will be ignored if no SCTP used. 337 */ 338 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 339 DTLS1_SCTP_AUTH_LABEL); 340 341 SSL_export_keying_material(s, sctpauthkey, 342 sizeof(sctpauthkey), labelbuffer, 343 sizeof(labelbuffer), NULL, 0, 0); 344 345 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 346 sizeof(sctpauthkey), sctpauthkey); 347#endif 348 349 s->state=SSL3_ST_CR_FINISHED_A; 350 } 351 else 352 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 353 } 354 s->init_num=0; 355 break; 356 357 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 358 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 359 360 ret = dtls1_get_hello_verify(s); 361 if ( ret <= 0) 362 goto end; 363 dtls1_stop_timer(s); 364 if ( s->d1->send_cookie) /* start again, with a cookie */ 365 s->state=SSL3_ST_CW_CLNT_HELLO_A; 366 else 367 s->state = SSL3_ST_CR_CERT_A; 368 s->init_num = 0; 369 break; 370 371 case SSL3_ST_CR_CERT_A: 372 case SSL3_ST_CR_CERT_B: 373#ifndef OPENSSL_NO_TLSEXT 374 ret=ssl3_check_finished(s); 375 if (ret <= 0) goto end; 376 if (ret == 2) 377 { 378 s->hit = 1; 379 if (s->tlsext_ticket_expected) 380 s->state=SSL3_ST_CR_SESSION_TICKET_A; 381 else 382 s->state=SSL3_ST_CR_FINISHED_A; 383 s->init_num=0; 384 break; 385 } 386#endif 387 /* Check if it is anon DH or PSK */ 388 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 389 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 390 { 391 ret=ssl3_get_server_certificate(s); 392 if (ret <= 0) goto end; 393#ifndef OPENSSL_NO_TLSEXT 394 if (s->tlsext_status_expected) 395 s->state=SSL3_ST_CR_CERT_STATUS_A; 396 else 397 s->state=SSL3_ST_CR_KEY_EXCH_A; 398 } 399 else 400 { 401 skip = 1; 402 s->state=SSL3_ST_CR_KEY_EXCH_A; 403 } 404#else 405 } 406 else 407 skip=1; 408 409 s->state=SSL3_ST_CR_KEY_EXCH_A; 410#endif 411 s->init_num=0; 412 break; 413 414 case SSL3_ST_CR_KEY_EXCH_A: 415 case SSL3_ST_CR_KEY_EXCH_B: 416 ret=ssl3_get_key_exchange(s); 417 if (ret <= 0) goto end; 418 s->state=SSL3_ST_CR_CERT_REQ_A; 419 s->init_num=0; 420 421 /* at this point we check that we have the 422 * required stuff from the server */ 423 if (!ssl3_check_cert_and_algorithm(s)) 424 { 425 ret= -1; 426 goto end; 427 } 428 break; 429 430 case SSL3_ST_CR_CERT_REQ_A: 431 case SSL3_ST_CR_CERT_REQ_B: 432 ret=ssl3_get_certificate_request(s); 433 if (ret <= 0) goto end; 434 s->state=SSL3_ST_CR_SRVR_DONE_A; 435 s->init_num=0; 436 break; 437 438 case SSL3_ST_CR_SRVR_DONE_A: 439 case SSL3_ST_CR_SRVR_DONE_B: 440 ret=ssl3_get_server_done(s); 441 if (ret <= 0) goto end; 442 dtls1_stop_timer(s); 443 if (s->s3->tmp.cert_req) 444 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A; 445 else 446 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A; 447 s->init_num=0; 448 449#ifndef OPENSSL_NO_SCTP 450 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 451 state == SSL_ST_RENEGOTIATE) 452 s->state=DTLS1_SCTP_ST_CR_READ_SOCK; 453 else 454#endif 455 s->state=s->s3->tmp.next_state; 456 break; 457 458 case SSL3_ST_CW_CERT_A: 459 case SSL3_ST_CW_CERT_B: 460 case SSL3_ST_CW_CERT_C: 461 case SSL3_ST_CW_CERT_D: 462 dtls1_start_timer(s); 463 ret=dtls1_send_client_certificate(s); 464 if (ret <= 0) goto end; 465 s->state=SSL3_ST_CW_KEY_EXCH_A; 466 s->init_num=0; 467 break; 468 469 case SSL3_ST_CW_KEY_EXCH_A: 470 case SSL3_ST_CW_KEY_EXCH_B: 471 dtls1_start_timer(s); 472 ret=dtls1_send_client_key_exchange(s); 473 if (ret <= 0) goto end; 474 475#ifndef OPENSSL_NO_SCTP 476 /* Add new shared key for SCTP-Auth, 477 * will be ignored if no SCTP used. 478 */ 479 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 480 DTLS1_SCTP_AUTH_LABEL); 481 482 SSL_export_keying_material(s, sctpauthkey, 483 sizeof(sctpauthkey), labelbuffer, 484 sizeof(labelbuffer), NULL, 0, 0); 485 486 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 487 sizeof(sctpauthkey), sctpauthkey); 488#endif 489 490 /* EAY EAY EAY need to check for DH fix cert 491 * sent back */ 492 /* For TLS, cert_req is set to 2, so a cert chain 493 * of nothing is sent, but no verify packet is sent */ 494 if (s->s3->tmp.cert_req == 1) 495 { 496 s->state=SSL3_ST_CW_CERT_VRFY_A; 497 } 498 else 499 { 500#ifndef OPENSSL_NO_SCTP 501 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 502 { 503 s->d1->next_state=SSL3_ST_CW_CHANGE_A; 504 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 505 } 506 else 507#endif 508 s->state=SSL3_ST_CW_CHANGE_A; 509 s->s3->change_cipher_spec=0; 510 } 511 512 s->init_num=0; 513 break; 514 515 case SSL3_ST_CW_CERT_VRFY_A: 516 case SSL3_ST_CW_CERT_VRFY_B: 517 dtls1_start_timer(s); 518 ret=dtls1_send_client_verify(s); 519 if (ret <= 0) goto end; 520#ifndef OPENSSL_NO_SCTP 521 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 522 { 523 s->d1->next_state=SSL3_ST_CW_CHANGE_A; 524 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 525 } 526 else 527#endif 528 s->state=SSL3_ST_CW_CHANGE_A; 529 s->init_num=0; 530 s->s3->change_cipher_spec=0; 531 break; 532 533 case SSL3_ST_CW_CHANGE_A: 534 case SSL3_ST_CW_CHANGE_B: 535 if (!s->hit) 536 dtls1_start_timer(s); 537 ret=dtls1_send_change_cipher_spec(s, 538 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B); 539 if (ret <= 0) goto end; 540 541 s->state=SSL3_ST_CW_FINISHED_A; 542 s->init_num=0; 543 544 s->session->cipher=s->s3->tmp.new_cipher; 545#ifdef OPENSSL_NO_COMP 546 s->session->compress_meth=0; 547#else 548 if (s->s3->tmp.new_compression == NULL) 549 s->session->compress_meth=0; 550 else 551 s->session->compress_meth= 552 s->s3->tmp.new_compression->id; 553#endif 554 if (!s->method->ssl3_enc->setup_key_block(s)) 555 { 556 ret= -1; 557 goto end; 558 } 559 560 if (!s->method->ssl3_enc->change_cipher_state(s, 561 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 562 { 563 ret= -1; 564 goto end; 565 } 566 567#ifndef OPENSSL_NO_SCTP 568 if (s->hit) 569 { 570 /* Change to new shared key of SCTP-Auth, 571 * will be ignored if no SCTP used. 572 */ 573 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 574 } 575#endif 576 577 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 578 break; 579 580 case SSL3_ST_CW_FINISHED_A: 581 case SSL3_ST_CW_FINISHED_B: 582 if (!s->hit) 583 dtls1_start_timer(s); 584 ret=dtls1_send_finished(s, 585 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B, 586 s->method->ssl3_enc->client_finished_label, 587 s->method->ssl3_enc->client_finished_label_len); 588 if (ret <= 0) goto end; 589 s->state=SSL3_ST_CW_FLUSH; 590 591 /* clear flags */ 592 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER; 593 if (s->hit) 594 { 595 s->s3->tmp.next_state=SSL_ST_OK; 596#ifndef OPENSSL_NO_SCTP 597 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 598 { 599 s->d1->next_state = s->s3->tmp.next_state; 600 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 601 } 602#endif 603 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) 604 { 605 s->state=SSL_ST_OK; 606#ifndef OPENSSL_NO_SCTP 607 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 608 { 609 s->d1->next_state = SSL_ST_OK; 610 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 611 } 612#endif 613 s->s3->flags|=SSL3_FLAGS_POP_BUFFER; 614 s->s3->delay_buf_pop_ret=0; 615 } 616 } 617 else 618 { 619#ifndef OPENSSL_NO_SCTP 620 /* Change to new shared key of SCTP-Auth, 621 * will be ignored if no SCTP used. 622 */ 623 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 624#endif 625 626#ifndef OPENSSL_NO_TLSEXT 627 /* Allow NewSessionTicket if ticket expected */ 628 if (s->tlsext_ticket_expected) 629 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A; 630 else 631#endif 632 633 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A; 634 } 635 s->init_num=0; 636 break; 637 638#ifndef OPENSSL_NO_TLSEXT 639 case SSL3_ST_CR_SESSION_TICKET_A: 640 case SSL3_ST_CR_SESSION_TICKET_B: 641 ret=ssl3_get_new_session_ticket(s); 642 if (ret <= 0) goto end; 643 s->state=SSL3_ST_CR_FINISHED_A; 644 s->init_num=0; 645 break; 646 647 case SSL3_ST_CR_CERT_STATUS_A: 648 case SSL3_ST_CR_CERT_STATUS_B: 649 ret=ssl3_get_cert_status(s); 650 if (ret <= 0) goto end; 651 s->state=SSL3_ST_CR_KEY_EXCH_A; 652 s->init_num=0; 653 break; 654#endif 655 656 case SSL3_ST_CR_FINISHED_A: 657 case SSL3_ST_CR_FINISHED_B: 658 s->d1->change_cipher_spec_ok = 1; 659 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A, 660 SSL3_ST_CR_FINISHED_B); 661 if (ret <= 0) goto end; 662 dtls1_stop_timer(s); 663 664 if (s->hit) 665 s->state=SSL3_ST_CW_CHANGE_A; 666 else 667 s->state=SSL_ST_OK; 668 669#ifndef OPENSSL_NO_SCTP 670 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 671 state == SSL_ST_RENEGOTIATE) 672 { 673 s->d1->next_state=s->state; 674 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 675 } 676#endif 677 678 s->init_num=0; 679 break; 680 681 case SSL3_ST_CW_FLUSH: 682 s->rwstate=SSL_WRITING; 683 if (BIO_flush(s->wbio) <= 0) 684 { 685 /* If the write error was fatal, stop trying */ 686 if (!BIO_should_retry(s->wbio)) 687 { 688 s->rwstate=SSL_NOTHING; 689 s->state=s->s3->tmp.next_state; 690 } 691 692 ret= -1; 693 goto end; 694 } 695 s->rwstate=SSL_NOTHING; 696 s->state=s->s3->tmp.next_state; 697 break; 698 699 case SSL_ST_OK: 700 /* clean a few things up */ 701 ssl3_cleanup_key_block(s); 702 703#if 0 704 if (s->init_buf != NULL) 705 { 706 BUF_MEM_free(s->init_buf); 707 s->init_buf=NULL; 708 } 709#endif 710 711 /* If we are not 'joining' the last two packets, 712 * remove the buffering now */ 713 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 714 ssl_free_wbio_buffer(s); 715 /* else do it later in ssl3_write */ 716 717 s->init_num=0; 718 s->renegotiate=0; 719 s->new_session=0; 720 721 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT); 722 if (s->hit) s->ctx->stats.sess_hit++; 723 724 ret=1; 725 /* s->server=0; */ 726 s->handshake_func=dtls1_connect; 727 s->ctx->stats.sess_connect_good++; 728 729 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 730 731 /* done with handshaking */ 732 s->d1->handshake_read_seq = 0; 733 s->d1->next_handshake_write_seq = 0; 734 goto end; 735 /* break; */ 736 737 default: 738 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE); 739 ret= -1; 740 goto end; 741 /* break; */ 742 } 743 744 /* did we do anything */ 745 if (!s->s3->tmp.reuse_message && !skip) 746 { 747 if (s->debug) 748 { 749 if ((ret=BIO_flush(s->wbio)) <= 0) 750 goto end; 751 } 752 753 if ((cb != NULL) && (s->state != state)) 754 { 755 new_state=s->state; 756 s->state=state; 757 cb(s,SSL_CB_CONNECT_LOOP,1); 758 s->state=new_state; 759 } 760 } 761 skip=0; 762 } 763end: 764 s->in_handshake--; 765 766#ifndef OPENSSL_NO_SCTP 767 /* Notify SCTP BIO socket to leave handshake 768 * mode and allow stream identifier other 769 * than 0. Will be ignored if no SCTP is used. 770 */ 771 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL); 772#endif 773 774 if (buf != NULL) 775 BUF_MEM_free(buf); 776 if (cb != NULL) 777 cb(s,SSL_CB_CONNECT_EXIT,ret); 778 return(ret); 779 } 780 781int dtls1_client_hello(SSL *s) 782 { 783 unsigned char *buf; 784 unsigned char *p,*d; 785 unsigned int i,j; 786 unsigned long l; 787 SSL_COMP *comp; 788 789 buf=(unsigned char *)s->init_buf->data; 790 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) 791 { 792 SSL_SESSION *sess = s->session; 793 if ((s->session == NULL) || 794 (s->session->ssl_version != s->version) || 795#ifdef OPENSSL_NO_TLSEXT 796 !sess->session_id_length || 797#else 798 (!sess->session_id_length && !sess->tlsext_tick) || 799#endif 800 (s->session->not_resumable)) 801 { 802 if (!s->session_creation_enabled) 803 { 804 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 805 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_SESSION_MAY_NOT_BE_CREATED); 806 goto err; 807 } 808 if (!ssl_get_new_session(s,0)) 809 goto err; 810 } 811 /* else use the pre-loaded session */ 812 813 p=s->s3->client_random; 814 815 /* if client_random is initialized, reuse it, we are 816 * required to use same upon reply to HelloVerify */ 817 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) 818 ; 819 if (i==sizeof(s->s3->client_random)) 820 ssl_fill_hello_random(s, 0, p, 821 sizeof(s->s3->client_random)); 822 823 /* Do the message type and length last */ 824 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 825 826 *(p++)=s->version>>8; 827 *(p++)=s->version&0xff; 828 s->client_version=s->version; 829 830 /* Random stuff */ 831 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 832 p+=SSL3_RANDOM_SIZE; 833 834 /* Session ID */ 835 if (s->new_session) 836 i=0; 837 else 838 i=s->session->session_id_length; 839 *(p++)=i; 840 if (i != 0) 841 { 842 if (i > sizeof s->session->session_id) 843 { 844 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 845 goto err; 846 } 847 memcpy(p,s->session->session_id,i); 848 p+=i; 849 } 850 851 /* cookie stuff */ 852 if ( s->d1->cookie_len > sizeof(s->d1->cookie)) 853 { 854 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 855 goto err; 856 } 857 *(p++) = s->d1->cookie_len; 858 memcpy(p, s->d1->cookie, s->d1->cookie_len); 859 p += s->d1->cookie_len; 860 861 /* Ciphers supported */ 862 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0); 863 if (i == 0) 864 { 865 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 866 goto err; 867 } 868 s2n(i,p); 869 p+=i; 870 871 /* COMPRESSION */ 872 if (s->ctx->comp_methods == NULL) 873 j=0; 874 else 875 j=sk_SSL_COMP_num(s->ctx->comp_methods); 876 *(p++)=1+j; 877 for (i=0; i<j; i++) 878 { 879 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 880 *(p++)=comp->id; 881 } 882 *(p++)=0; /* Add the NULL method */ 883 884#ifndef OPENSSL_NO_TLSEXT 885 /* TLS extensions*/ 886 if (ssl_prepare_clienthello_tlsext(s) <= 0) 887 { 888 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT); 889 goto err; 890 } 891 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 892 { 893 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 894 goto err; 895 } 896#endif 897 898 l=(p-d); 899 d=buf; 900 901 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l); 902 903 s->state=SSL3_ST_CW_CLNT_HELLO_B; 904 /* number of bytes to write */ 905 s->init_num=p-buf; 906 s->init_off=0; 907 908 /* buffer the message to handle re-xmits */ 909 dtls1_buffer_message(s, 0); 910 } 911 912 /* SSL3_ST_CW_CLNT_HELLO_B */ 913 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 914err: 915 return(-1); 916 } 917 918static int dtls1_get_hello_verify(SSL *s) 919 { 920 int n, al, ok = 0; 921 unsigned char *data; 922 unsigned int cookie_len; 923 924 n=s->method->ssl_get_message(s, 925 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 926 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 927 -1, 928 s->max_cert_list, 929 &ok); 930 931 if (!ok) return((int)n); 932 933 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) 934 { 935 s->d1->send_cookie = 0; 936 s->s3->tmp.reuse_message=1; 937 return(1); 938 } 939 940 data = (unsigned char *)s->init_msg; 941 942 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff))) 943 { 944 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION); 945 s->version=(s->version&0xff00)|data[1]; 946 al = SSL_AD_PROTOCOL_VERSION; 947 goto f_err; 948 } 949 data+=2; 950 951 cookie_len = *(data++); 952 if ( cookie_len > sizeof(s->d1->cookie)) 953 { 954 al=SSL_AD_ILLEGAL_PARAMETER; 955 goto f_err; 956 } 957 958 memcpy(s->d1->cookie, data, cookie_len); 959 s->d1->cookie_len = cookie_len; 960 961 s->d1->send_cookie = 1; 962 return 1; 963 964f_err: 965 ssl3_send_alert(s, SSL3_AL_FATAL, al); 966 return -1; 967 } 968 969int dtls1_send_client_key_exchange(SSL *s) 970 { 971 unsigned char *p,*d; 972 int n; 973 unsigned long alg_k; 974#ifndef OPENSSL_NO_RSA 975 unsigned char *q; 976 EVP_PKEY *pkey=NULL; 977#endif 978#ifndef OPENSSL_NO_KRB5 979 KSSL_ERR kssl_err; 980#endif /* OPENSSL_NO_KRB5 */ 981#ifndef OPENSSL_NO_ECDH 982 EC_KEY *clnt_ecdh = NULL; 983 const EC_POINT *srvr_ecpoint = NULL; 984 EVP_PKEY *srvr_pub_pkey = NULL; 985 unsigned char *encodedPoint = NULL; 986 int encoded_pt_len = 0; 987 BN_CTX * bn_ctx = NULL; 988#endif 989 990 if (s->state == SSL3_ST_CW_KEY_EXCH_A) 991 { 992 d=(unsigned char *)s->init_buf->data; 993 p= &(d[DTLS1_HM_HEADER_LENGTH]); 994 995 alg_k=s->s3->tmp.new_cipher->algorithm_mkey; 996 997 /* Fool emacs indentation */ 998 if (0) {} 999#ifndef OPENSSL_NO_RSA 1000 else if (alg_k & SSL_kRSA) 1001 { 1002 RSA *rsa; 1003 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 1004 1005 if (s->session->sess_cert == NULL) 1006 { 1007 /* We should always have a server certificate with SSL_kRSA. */ 1008 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1009 goto err; 1010 } 1011 1012 if (s->session->sess_cert->peer_rsa_tmp != NULL) 1013 rsa=s->session->sess_cert->peer_rsa_tmp; 1014 else 1015 { 1016 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1017 if ((pkey == NULL) || 1018 (pkey->type != EVP_PKEY_RSA) || 1019 (pkey->pkey.rsa == NULL)) 1020 { 1021 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1022 goto err; 1023 } 1024 rsa=pkey->pkey.rsa; 1025 EVP_PKEY_free(pkey); 1026 } 1027 1028 tmp_buf[0]=s->client_version>>8; 1029 tmp_buf[1]=s->client_version&0xff; 1030 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) 1031 goto err; 1032 1033 s->session->master_key_length=sizeof tmp_buf; 1034 1035 q=p; 1036 /* Fix buf for TLS and [incidentally] DTLS */ 1037 if (s->version > SSL3_VERSION) 1038 p+=2; 1039 n=RSA_public_encrypt(sizeof tmp_buf, 1040 tmp_buf,p,rsa,RSA_PKCS1_PADDING); 1041#ifdef PKCS1_CHECK 1042 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++; 1043 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70; 1044#endif 1045 if (n <= 0) 1046 { 1047 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT); 1048 goto err; 1049 } 1050 1051 /* Fix buf for TLS and [incidentally] DTLS */ 1052 if (s->version > SSL3_VERSION) 1053 { 1054 s2n(n,q); 1055 n+=2; 1056 } 1057 1058 s->session->master_key_length= 1059 s->method->ssl3_enc->generate_master_secret(s, 1060 s->session->master_key, 1061 tmp_buf,sizeof tmp_buf); 1062 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf); 1063 } 1064#endif 1065#ifndef OPENSSL_NO_KRB5 1066 else if (alg_k & SSL_kKRB5) 1067 { 1068 krb5_error_code krb5rc; 1069 KSSL_CTX *kssl_ctx = s->kssl_ctx; 1070 /* krb5_data krb5_ap_req; */ 1071 krb5_data *enc_ticket; 1072 krb5_data authenticator, *authp = NULL; 1073 EVP_CIPHER_CTX ciph_ctx; 1074 const EVP_CIPHER *enc = NULL; 1075 unsigned char iv[EVP_MAX_IV_LENGTH]; 1076 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 1077 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH 1078 + EVP_MAX_IV_LENGTH]; 1079 int padl, outl = sizeof(epms); 1080 1081 EVP_CIPHER_CTX_init(&ciph_ctx); 1082 1083#ifdef KSSL_DEBUG 1084 printf("ssl3_send_client_key_exchange(%lx & %lx)\n", 1085 alg_k, SSL_kKRB5); 1086#endif /* KSSL_DEBUG */ 1087 1088 authp = NULL; 1089#ifdef KRB5SENDAUTH 1090 if (KRB5SENDAUTH) authp = &authenticator; 1091#endif /* KRB5SENDAUTH */ 1092 1093 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, 1094 &kssl_err); 1095 enc = kssl_map_enc(kssl_ctx->enctype); 1096 if (enc == NULL) 1097 goto err; 1098#ifdef KSSL_DEBUG 1099 { 1100 printf("kssl_cget_tkt rtn %d\n", krb5rc); 1101 if (krb5rc && kssl_err.text) 1102 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 1103 } 1104#endif /* KSSL_DEBUG */ 1105 1106 if (krb5rc) 1107 { 1108 ssl3_send_alert(s,SSL3_AL_FATAL, 1109 SSL_AD_HANDSHAKE_FAILURE); 1110 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1111 kssl_err.reason); 1112 goto err; 1113 } 1114 1115 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ 1116 ** in place of RFC 2712 KerberosWrapper, as in: 1117 ** 1118 ** Send ticket (copy to *p, set n = length) 1119 ** n = krb5_ap_req.length; 1120 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 1121 ** if (krb5_ap_req.data) 1122 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 1123 ** 1124 ** Now using real RFC 2712 KerberosWrapper 1125 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) 1126 ** Note: 2712 "opaque" types are here replaced 1127 ** with a 2-byte length followed by the value. 1128 ** Example: 1129 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 1130 ** Where "xx xx" = length bytes. Shown here with 1131 ** optional authenticator omitted. 1132 */ 1133 1134 /* KerberosWrapper.Ticket */ 1135 s2n(enc_ticket->length,p); 1136 memcpy(p, enc_ticket->data, enc_ticket->length); 1137 p+= enc_ticket->length; 1138 n = enc_ticket->length + 2; 1139 1140 /* KerberosWrapper.Authenticator */ 1141 if (authp && authp->length) 1142 { 1143 s2n(authp->length,p); 1144 memcpy(p, authp->data, authp->length); 1145 p+= authp->length; 1146 n+= authp->length + 2; 1147 1148 free(authp->data); 1149 authp->data = NULL; 1150 authp->length = 0; 1151 } 1152 else 1153 { 1154 s2n(0,p);/* null authenticator length */ 1155 n+=2; 1156 } 1157 1158 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0) 1159 goto err; 1160 1161 /* 20010420 VRS. Tried it this way; failed. 1162 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 1163 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 1164 ** kssl_ctx->length); 1165 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 1166 */ 1167 1168 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 1169 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL, 1170 kssl_ctx->key,iv); 1171 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf, 1172 sizeof tmp_buf); 1173 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl); 1174 outl += padl; 1175 if (outl > (int)sizeof epms) 1176 { 1177 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1178 goto err; 1179 } 1180 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 1181 1182 /* KerberosWrapper.EncryptedPreMasterSecret */ 1183 s2n(outl,p); 1184 memcpy(p, epms, outl); 1185 p+=outl; 1186 n+=outl + 2; 1187 1188 s->session->master_key_length= 1189 s->method->ssl3_enc->generate_master_secret(s, 1190 s->session->master_key, 1191 tmp_buf, sizeof tmp_buf); 1192 1193 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 1194 OPENSSL_cleanse(epms, outl); 1195 } 1196#endif 1197#ifndef OPENSSL_NO_DH 1198 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 1199 { 1200 DH *dh_srvr,*dh_clnt; 1201 1202 if (s->session->sess_cert == NULL) 1203 { 1204 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 1205 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE); 1206 goto err; 1207 } 1208 1209 if (s->session->sess_cert->peer_dh_tmp != NULL) 1210 dh_srvr=s->session->sess_cert->peer_dh_tmp; 1211 else 1212 { 1213 /* we get them from the cert */ 1214 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1215 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1216 goto err; 1217 } 1218 1219 /* generate a new random key */ 1220 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL) 1221 { 1222 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1223 goto err; 1224 } 1225 if (!DH_generate_key(dh_clnt)) 1226 { 1227 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1228 goto err; 1229 } 1230 1231 /* use the 'p' output buffer for the DH key, but 1232 * make sure to clear it out afterwards */ 1233 1234 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt); 1235 1236 if (n <= 0) 1237 { 1238 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1239 goto err; 1240 } 1241 1242 /* generate master key from the result */ 1243 s->session->master_key_length= 1244 s->method->ssl3_enc->generate_master_secret(s, 1245 s->session->master_key,p,n); 1246 /* clean up */ 1247 memset(p,0,n); 1248 1249 /* send off the data */ 1250 n=BN_num_bytes(dh_clnt->pub_key); 1251 s2n(n,p); 1252 BN_bn2bin(dh_clnt->pub_key,p); 1253 n+=2; 1254 1255 DH_free(dh_clnt); 1256 1257 /* perhaps clean things up a bit EAY EAY EAY EAY*/ 1258 } 1259#endif 1260#ifndef OPENSSL_NO_ECDH 1261 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) 1262 { 1263 const EC_GROUP *srvr_group = NULL; 1264 EC_KEY *tkey; 1265 int ecdh_clnt_cert = 0; 1266 int field_size = 0; 1267 1268 if (s->session->sess_cert == NULL) 1269 { 1270 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 1271 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE); 1272 goto err; 1273 } 1274 1275 /* Did we send out the client's 1276 * ECDH share for use in premaster 1277 * computation as part of client certificate? 1278 * If so, set ecdh_clnt_cert to 1. 1279 */ 1280 if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 1281 { 1282 /* XXX: For now, we do not support client 1283 * authentication using ECDH certificates. 1284 * To add such support, one needs to add 1285 * code that checks for appropriate 1286 * conditions and sets ecdh_clnt_cert to 1. 1287 * For example, the cert have an ECC 1288 * key on the same curve as the server's 1289 * and the key should be authorized for 1290 * key agreement. 1291 * 1292 * One also needs to add code in ssl3_connect 1293 * to skip sending the certificate verify 1294 * message. 1295 * 1296 * if ((s->cert->key->privatekey != NULL) && 1297 * (s->cert->key->privatekey->type == 1298 * EVP_PKEY_EC) && ...) 1299 * ecdh_clnt_cert = 1; 1300 */ 1301 } 1302 1303 if (s->session->sess_cert->peer_ecdh_tmp != NULL) 1304 { 1305 tkey = s->session->sess_cert->peer_ecdh_tmp; 1306 } 1307 else 1308 { 1309 /* Get the Server Public Key from Cert */ 1310 srvr_pub_pkey = X509_get_pubkey(s->session-> \ 1311 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1312 if ((srvr_pub_pkey == NULL) || 1313 (srvr_pub_pkey->type != EVP_PKEY_EC) || 1314 (srvr_pub_pkey->pkey.ec == NULL)) 1315 { 1316 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1317 ERR_R_INTERNAL_ERROR); 1318 goto err; 1319 } 1320 1321 tkey = srvr_pub_pkey->pkey.ec; 1322 } 1323 1324 srvr_group = EC_KEY_get0_group(tkey); 1325 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 1326 1327 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) 1328 { 1329 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1330 ERR_R_INTERNAL_ERROR); 1331 goto err; 1332 } 1333 1334 if ((clnt_ecdh=EC_KEY_new()) == NULL) 1335 { 1336 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1337 goto err; 1338 } 1339 1340 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) 1341 { 1342 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1343 goto err; 1344 } 1345 if (ecdh_clnt_cert) 1346 { 1347 /* Reuse key info from our certificate 1348 * We only need our private key to perform 1349 * the ECDH computation. 1350 */ 1351 const BIGNUM *priv_key; 1352 tkey = s->cert->key->privatekey->pkey.ec; 1353 priv_key = EC_KEY_get0_private_key(tkey); 1354 if (priv_key == NULL) 1355 { 1356 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1357 goto err; 1358 } 1359 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) 1360 { 1361 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1362 goto err; 1363 } 1364 } 1365 else 1366 { 1367 /* Generate a new ECDH key pair */ 1368 if (!(EC_KEY_generate_key(clnt_ecdh))) 1369 { 1370 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1371 goto err; 1372 } 1373 } 1374 1375 /* use the 'p' output buffer for the ECDH key, but 1376 * make sure to clear it out afterwards 1377 */ 1378 1379 field_size = EC_GROUP_get_degree(srvr_group); 1380 if (field_size <= 0) 1381 { 1382 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1383 ERR_R_ECDH_LIB); 1384 goto err; 1385 } 1386 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL); 1387 if (n <= 0) 1388 { 1389 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1390 ERR_R_ECDH_LIB); 1391 goto err; 1392 } 1393 1394 /* generate master key from the result */ 1395 s->session->master_key_length = s->method->ssl3_enc \ 1396 -> generate_master_secret(s, 1397 s->session->master_key, 1398 p, n); 1399 1400 memset(p, 0, n); /* clean up */ 1401 1402 if (ecdh_clnt_cert) 1403 { 1404 /* Send empty client key exch message */ 1405 n = 0; 1406 } 1407 else 1408 { 1409 /* First check the size of encoding and 1410 * allocate memory accordingly. 1411 */ 1412 encoded_pt_len = 1413 EC_POINT_point2oct(srvr_group, 1414 EC_KEY_get0_public_key(clnt_ecdh), 1415 POINT_CONVERSION_UNCOMPRESSED, 1416 NULL, 0, NULL); 1417 1418 encodedPoint = (unsigned char *) 1419 OPENSSL_malloc(encoded_pt_len * 1420 sizeof(unsigned char)); 1421 bn_ctx = BN_CTX_new(); 1422 if ((encodedPoint == NULL) || 1423 (bn_ctx == NULL)) 1424 { 1425 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1426 goto err; 1427 } 1428 1429 /* Encode the public key */ 1430 n = EC_POINT_point2oct(srvr_group, 1431 EC_KEY_get0_public_key(clnt_ecdh), 1432 POINT_CONVERSION_UNCOMPRESSED, 1433 encodedPoint, encoded_pt_len, bn_ctx); 1434 1435 *p = n; /* length of encoded point */ 1436 /* Encoded point will be copied here */ 1437 p += 1; 1438 /* copy the point */ 1439 memcpy((unsigned char *)p, encodedPoint, n); 1440 /* increment n to account for length field */ 1441 n += 1; 1442 } 1443 1444 /* Free allocated memory */ 1445 BN_CTX_free(bn_ctx); 1446 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1447 if (clnt_ecdh != NULL) 1448 EC_KEY_free(clnt_ecdh); 1449 EVP_PKEY_free(srvr_pub_pkey); 1450 } 1451#endif /* !OPENSSL_NO_ECDH */ 1452 1453#ifndef OPENSSL_NO_PSK 1454 else if (alg_k & SSL_kPSK) 1455 { 1456 char identity[PSK_MAX_IDENTITY_LEN]; 1457 unsigned char *t = NULL; 1458 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4]; 1459 unsigned int pre_ms_len = 0, psk_len = 0; 1460 int psk_err = 1; 1461 1462 n = 0; 1463 if (s->psk_client_callback == NULL) 1464 { 1465 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1466 SSL_R_PSK_NO_CLIENT_CB); 1467 goto err; 1468 } 1469 1470 psk_len = s->psk_client_callback(s, s->session->psk_identity_hint, 1471 identity, PSK_MAX_IDENTITY_LEN, 1472 psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1473 if (psk_len > PSK_MAX_PSK_LEN) 1474 { 1475 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1476 ERR_R_INTERNAL_ERROR); 1477 goto psk_err; 1478 } 1479 else if (psk_len == 0) 1480 { 1481 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1482 SSL_R_PSK_IDENTITY_NOT_FOUND); 1483 goto psk_err; 1484 } 1485 1486 /* create PSK pre_master_secret */ 1487 pre_ms_len = 2+psk_len+2+psk_len; 1488 t = psk_or_pre_ms; 1489 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len); 1490 s2n(psk_len, t); 1491 memset(t, 0, psk_len); 1492 t+=psk_len; 1493 s2n(psk_len, t); 1494 1495 if (s->session->psk_identity != NULL) 1496 OPENSSL_free(s->session->psk_identity); 1497 s->session->psk_identity = BUF_strdup(identity); 1498 if (s->session->psk_identity == NULL) 1499 { 1500 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1501 ERR_R_MALLOC_FAILURE); 1502 goto psk_err; 1503 } 1504 1505 s->session->master_key_length = 1506 s->method->ssl3_enc->generate_master_secret(s, 1507 s->session->master_key, 1508 psk_or_pre_ms, pre_ms_len); 1509 n = strlen(identity); 1510 s2n(n, p); 1511 memcpy(p, identity, n); 1512 n+=2; 1513 psk_err = 0; 1514 psk_err: 1515 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN); 1516 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1517 if (psk_err != 0) 1518 { 1519 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1520 goto err; 1521 } 1522 } 1523#endif 1524 else 1525 { 1526 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1527 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1528 goto err; 1529 } 1530 1531 d = dtls1_set_message_header(s, d, 1532 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); 1533 /* 1534 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 1535 l2n3(n,d); 1536 l2n(s->d1->handshake_write_seq,d); 1537 s->d1->handshake_write_seq++; 1538 */ 1539 1540 s->state=SSL3_ST_CW_KEY_EXCH_B; 1541 /* number of bytes to write */ 1542 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1543 s->init_off=0; 1544 1545 /* buffer the message to handle re-xmits */ 1546 dtls1_buffer_message(s, 0); 1547 } 1548 1549 /* SSL3_ST_CW_KEY_EXCH_B */ 1550 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1551err: 1552#ifndef OPENSSL_NO_ECDH 1553 BN_CTX_free(bn_ctx); 1554 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1555 if (clnt_ecdh != NULL) 1556 EC_KEY_free(clnt_ecdh); 1557 EVP_PKEY_free(srvr_pub_pkey); 1558#endif 1559 return(-1); 1560 } 1561 1562int dtls1_send_client_verify(SSL *s) 1563 { 1564 unsigned char *p,*d; 1565 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1566 EVP_PKEY *pkey; 1567#ifndef OPENSSL_NO_RSA 1568 unsigned u=0; 1569#endif 1570 unsigned long n; 1571#if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA) 1572 int j; 1573#endif 1574 1575 if (s->state == SSL3_ST_CW_CERT_VRFY_A) 1576 { 1577 d=(unsigned char *)s->init_buf->data; 1578 p= &(d[DTLS1_HM_HEADER_LENGTH]); 1579 pkey=s->cert->key->privatekey; 1580 1581 s->method->ssl3_enc->cert_verify_mac(s, 1582 NID_sha1, 1583 &(data[MD5_DIGEST_LENGTH])); 1584 1585#ifndef OPENSSL_NO_RSA 1586 if (pkey->type == EVP_PKEY_RSA) 1587 { 1588 s->method->ssl3_enc->cert_verify_mac(s, 1589 NID_md5, 1590 &(data[0])); 1591 if (RSA_sign(NID_md5_sha1, data, 1592 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, 1593 &(p[2]), &u, pkey->pkey.rsa) <= 0 ) 1594 { 1595 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB); 1596 goto err; 1597 } 1598 s2n(u,p); 1599 n=u+2; 1600 } 1601 else 1602#endif 1603#ifndef OPENSSL_NO_DSA 1604 if (pkey->type == EVP_PKEY_DSA) 1605 { 1606 if (!DSA_sign(pkey->save_type, 1607 &(data[MD5_DIGEST_LENGTH]), 1608 SHA_DIGEST_LENGTH,&(p[2]), 1609 (unsigned int *)&j,pkey->pkey.dsa)) 1610 { 1611 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB); 1612 goto err; 1613 } 1614 s2n(j,p); 1615 n=j+2; 1616 } 1617 else 1618#endif 1619#ifndef OPENSSL_NO_ECDSA 1620 if (pkey->type == EVP_PKEY_EC) 1621 { 1622 if (!ECDSA_sign(pkey->save_type, 1623 &(data[MD5_DIGEST_LENGTH]), 1624 SHA_DIGEST_LENGTH,&(p[2]), 1625 (unsigned int *)&j,pkey->pkey.ec)) 1626 { 1627 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, 1628 ERR_R_ECDSA_LIB); 1629 goto err; 1630 } 1631 s2n(j,p); 1632 n=j+2; 1633 } 1634 else 1635#endif 1636 { 1637 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR); 1638 goto err; 1639 } 1640 1641 d = dtls1_set_message_header(s, d, 1642 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ; 1643 1644 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH; 1645 s->init_off=0; 1646 1647 /* buffer the message to handle re-xmits */ 1648 dtls1_buffer_message(s, 0); 1649 1650 s->state = SSL3_ST_CW_CERT_VRFY_B; 1651 } 1652 1653 /* s->state = SSL3_ST_CW_CERT_VRFY_B */ 1654 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1655err: 1656 return(-1); 1657 } 1658 1659int dtls1_send_client_certificate(SSL *s) 1660 { 1661 X509 *x509=NULL; 1662 EVP_PKEY *pkey=NULL; 1663 int i; 1664 unsigned long l; 1665 1666 if (s->state == SSL3_ST_CW_CERT_A) 1667 { 1668 if ((s->cert == NULL) || 1669 (s->cert->key->x509 == NULL) || 1670 (s->cert->key->privatekey == NULL)) 1671 s->state=SSL3_ST_CW_CERT_B; 1672 else 1673 s->state=SSL3_ST_CW_CERT_C; 1674 } 1675 1676 /* We need to get a client cert */ 1677 if (s->state == SSL3_ST_CW_CERT_B) 1678 { 1679 /* If we get an error, we need to 1680 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 1681 * We then get retied later */ 1682 i=0; 1683 i = ssl_do_client_cert_cb(s, &x509, &pkey); 1684 if (i < 0) 1685 { 1686 s->rwstate=SSL_X509_LOOKUP; 1687 return(-1); 1688 } 1689 s->rwstate=SSL_NOTHING; 1690 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) 1691 { 1692 s->state=SSL3_ST_CW_CERT_B; 1693 if ( !SSL_use_certificate(s,x509) || 1694 !SSL_use_PrivateKey(s,pkey)) 1695 i=0; 1696 } 1697 else if (i == 1) 1698 { 1699 i=0; 1700 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 1701 } 1702 1703 if (x509 != NULL) X509_free(x509); 1704 if (pkey != NULL) EVP_PKEY_free(pkey); 1705 if (i == 0) 1706 { 1707 if (s->version == SSL3_VERSION) 1708 { 1709 s->s3->tmp.cert_req=0; 1710 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE); 1711 return(1); 1712 } 1713 else 1714 { 1715 s->s3->tmp.cert_req=2; 1716 } 1717 } 1718 1719 /* Ok, we have a cert */ 1720 s->state=SSL3_ST_CW_CERT_C; 1721 } 1722 1723 if (s->state == SSL3_ST_CW_CERT_C) 1724 { 1725 s->state=SSL3_ST_CW_CERT_D; 1726 l=dtls1_output_cert_chain(s, 1727 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509); 1728 s->init_num=(int)l; 1729 s->init_off=0; 1730 1731 /* set header called by dtls1_output_cert_chain() */ 1732 1733 /* buffer the message to handle re-xmits */ 1734 dtls1_buffer_message(s, 0); 1735 } 1736 /* SSL3_ST_CW_CERT_D */ 1737 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1738 } 1739