d1_clnt.c revision 306196
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, dtls1_get_client_method) 145 146int dtls1_connect(SSL *s) 147{ 148 BUF_MEM *buf = NULL; 149 unsigned long Time = (unsigned long)time(NULL); 150 void (*cb) (const SSL *ssl, int type, int val) = NULL; 151 int ret = -1; 152 int new_state, state, skip = 0; 153#ifndef OPENSSL_NO_SCTP 154 unsigned char sctpauthkey[64]; 155 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; 156#endif 157 158 RAND_add(&Time, sizeof(Time), 0); 159 ERR_clear_error(); 160 clear_sys_error(); 161 162 if (s->info_callback != NULL) 163 cb = s->info_callback; 164 else if (s->ctx->info_callback != NULL) 165 cb = s->ctx->info_callback; 166 167 s->in_handshake++; 168 if (!SSL_in_init(s) || SSL_in_before(s)) 169 SSL_clear(s); 170 171#ifndef OPENSSL_NO_SCTP 172 /* 173 * Notify SCTP BIO socket to enter handshake mode and prevent stream 174 * identifier other 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, 177 s->in_handshake, NULL); 178#endif 179 180#ifndef OPENSSL_NO_HEARTBEATS 181 /* 182 * If we're awaiting a HeartbeatResponse, pretend we already got and 183 * don't await it anymore, because Heartbeats don't make sense during 184 * handshakes anyway. 185 */ 186 if (s->tlsext_hb_pending) { 187 dtls1_stop_timer(s); 188 s->tlsext_hb_pending = 0; 189 s->tlsext_hb_seq++; 190 } 191#endif 192 193 for (;;) { 194 state = s->state; 195 196 switch (s->state) { 197 case SSL_ST_RENEGOTIATE: 198 s->renegotiate = 1; 199 s->state = SSL_ST_CONNECT; 200 s->ctx->stats.sess_connect_renegotiate++; 201 /* break */ 202 case SSL_ST_BEFORE: 203 case SSL_ST_CONNECT: 204 case SSL_ST_BEFORE | SSL_ST_CONNECT: 205 case SSL_ST_OK | SSL_ST_CONNECT: 206 207 s->server = 0; 208 if (cb != NULL) 209 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 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR); 214 ret = -1; 215 s->state = SSL_ST_ERR; 216 goto end; 217 } 218 219 /* s->version=SSL3_VERSION; */ 220 s->type = SSL_ST_CONNECT; 221 222 if (s->init_buf == NULL) { 223 if ((buf = BUF_MEM_new()) == NULL) { 224 ret = -1; 225 s->state = SSL_ST_ERR; 226 goto end; 227 } 228 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { 229 ret = -1; 230 s->state = SSL_ST_ERR; 231 goto end; 232 } 233 s->init_buf = buf; 234 buf = NULL; 235 } 236 237 if (!ssl3_setup_buffers(s)) { 238 ret = -1; 239 s->state = SSL_ST_ERR; 240 goto end; 241 } 242 243 /* setup buffing BIO */ 244 if (!ssl_init_wbio_buffer(s, 0)) { 245 ret = -1; 246 s->state = SSL_ST_ERR; 247 goto end; 248 } 249 250 /* don't push the buffering BIO quite yet */ 251 252 s->state = SSL3_ST_CW_CLNT_HELLO_A; 253 s->ctx->stats.sess_connect++; 254 s->init_num = 0; 255 /* mark client_random uninitialized */ 256 memset(s->s3->client_random, 0, sizeof(s->s3->client_random)); 257 s->d1->send_cookie = 0; 258 s->hit = 0; 259 s->d1->change_cipher_spec_ok = 0; 260 /* 261 * Should have been reset by ssl3_get_finished, too. 262 */ 263 s->s3->change_cipher_spec = 0; 264 break; 265 266#ifndef OPENSSL_NO_SCTP 267 case DTLS1_SCTP_ST_CR_READ_SOCK: 268 269 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { 270 s->s3->in_read_app_data = 2; 271 s->rwstate = SSL_READING; 272 BIO_clear_retry_flags(SSL_get_rbio(s)); 273 BIO_set_retry_read(SSL_get_rbio(s)); 274 ret = -1; 275 goto end; 276 } 277 278 s->state = s->s3->tmp.next_state; 279 break; 280 281 case DTLS1_SCTP_ST_CW_WRITE_SOCK: 282 /* read app data until dry event */ 283 284 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 285 if (ret < 0) 286 goto end; 287 288 if (ret == 0) { 289 s->s3->in_read_app_data = 2; 290 s->rwstate = SSL_READING; 291 BIO_clear_retry_flags(SSL_get_rbio(s)); 292 BIO_set_retry_read(SSL_get_rbio(s)); 293 ret = -1; 294 goto end; 295 } 296 297 s->state = s->d1->next_state; 298 break; 299#endif 300 301 case SSL3_ST_CW_CLNT_HELLO_A: 302 s->shutdown = 0; 303 304 /* every DTLS ClientHello resets Finished MAC */ 305 ssl3_init_finished_mac(s); 306 307 case SSL3_ST_CW_CLNT_HELLO_B: 308 dtls1_start_timer(s); 309 ret = dtls1_client_hello(s); 310 if (ret <= 0) 311 goto end; 312 313 if (s->d1->send_cookie) { 314 s->state = SSL3_ST_CW_FLUSH; 315 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A; 316 } else 317 s->state = SSL3_ST_CR_SRVR_HELLO_A; 318 319 s->init_num = 0; 320 321#ifndef OPENSSL_NO_SCTP 322 /* Disable buffering for SCTP */ 323 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) { 324#endif 325 /* 326 * turn on buffering for the next lot of output 327 */ 328 if (s->bbio != s->wbio) 329 s->wbio = BIO_push(s->bbio, s->wbio); 330#ifndef OPENSSL_NO_SCTP 331 } 332#endif 333 334 break; 335 336 case SSL3_ST_CR_SRVR_HELLO_A: 337 case SSL3_ST_CR_SRVR_HELLO_B: 338 ret = ssl3_get_server_hello(s); 339 if (ret <= 0) 340 goto end; 341 else { 342 if (s->hit) { 343#ifndef OPENSSL_NO_SCTP 344 /* 345 * Add new shared key for SCTP-Auth, will be ignored if 346 * no SCTP used. 347 */ 348 snprintf((char *)labelbuffer, 349 sizeof(DTLS1_SCTP_AUTH_LABEL), 350 DTLS1_SCTP_AUTH_LABEL); 351 352 if (SSL_export_keying_material(s, sctpauthkey, 353 sizeof(sctpauthkey), 354 labelbuffer, 355 sizeof(labelbuffer), NULL, 0, 356 0) <= 0) { 357 ret = -1; 358 s->state = SSL_ST_ERR; 359 goto end; 360 } 361 362 BIO_ctrl(SSL_get_wbio(s), 363 BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 364 sizeof(sctpauthkey), sctpauthkey); 365#endif 366 367 s->state = SSL3_ST_CR_FINISHED_A; 368 if (s->tlsext_ticket_expected) { 369 /* receive renewed session ticket */ 370 s->state = SSL3_ST_CR_SESSION_TICKET_A; 371 } 372 } else 373 s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 374 } 375 s->init_num = 0; 376 break; 377 378 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 379 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 380 381 ret = dtls1_get_hello_verify(s); 382 if (ret <= 0) 383 goto end; 384 dtls1_stop_timer(s); 385 if (s->d1->send_cookie) /* start again, with a cookie */ 386 s->state = SSL3_ST_CW_CLNT_HELLO_A; 387 else 388 s->state = SSL3_ST_CR_CERT_A; 389 s->init_num = 0; 390 break; 391 392 case SSL3_ST_CR_CERT_A: 393 case SSL3_ST_CR_CERT_B: 394 /* Check if it is anon DH or PSK */ 395 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 396 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 397 ret = ssl3_get_server_certificate(s); 398 if (ret <= 0) 399 goto end; 400#ifndef OPENSSL_NO_TLSEXT 401 if (s->tlsext_status_expected) 402 s->state = SSL3_ST_CR_CERT_STATUS_A; 403 else 404 s->state = SSL3_ST_CR_KEY_EXCH_A; 405 } else { 406 skip = 1; 407 s->state = SSL3_ST_CR_KEY_EXCH_A; 408 } 409#else 410 } else 411 skip = 1; 412 413 s->state = SSL3_ST_CR_KEY_EXCH_A; 414#endif 415 s->init_num = 0; 416 break; 417 418 case SSL3_ST_CR_KEY_EXCH_A: 419 case SSL3_ST_CR_KEY_EXCH_B: 420 ret = ssl3_get_key_exchange(s); 421 if (ret <= 0) 422 goto end; 423 s->state = SSL3_ST_CR_CERT_REQ_A; 424 s->init_num = 0; 425 426 /* 427 * at this point we check that we have the required stuff from 428 * the server 429 */ 430 if (!ssl3_check_cert_and_algorithm(s)) { 431 ret = -1; 432 s->state = SSL_ST_ERR; 433 goto end; 434 } 435 break; 436 437 case SSL3_ST_CR_CERT_REQ_A: 438 case SSL3_ST_CR_CERT_REQ_B: 439 ret = ssl3_get_certificate_request(s); 440 if (ret <= 0) 441 goto end; 442 s->state = SSL3_ST_CR_SRVR_DONE_A; 443 s->init_num = 0; 444 break; 445 446 case SSL3_ST_CR_SRVR_DONE_A: 447 case SSL3_ST_CR_SRVR_DONE_B: 448 ret = ssl3_get_server_done(s); 449 if (ret <= 0) 450 goto end; 451 dtls1_stop_timer(s); 452 if (s->s3->tmp.cert_req) 453 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A; 454 else 455 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A; 456 s->init_num = 0; 457 458#ifndef OPENSSL_NO_SCTP 459 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 460 state == SSL_ST_RENEGOTIATE) 461 s->state = DTLS1_SCTP_ST_CR_READ_SOCK; 462 else 463#endif 464 s->state = s->s3->tmp.next_state; 465 break; 466 467 case SSL3_ST_CW_CERT_A: 468 case SSL3_ST_CW_CERT_B: 469 case SSL3_ST_CW_CERT_C: 470 case SSL3_ST_CW_CERT_D: 471 dtls1_start_timer(s); 472 ret = dtls1_send_client_certificate(s); 473 if (ret <= 0) 474 goto end; 475 s->state = SSL3_ST_CW_KEY_EXCH_A; 476 s->init_num = 0; 477 break; 478 479 case SSL3_ST_CW_KEY_EXCH_A: 480 case SSL3_ST_CW_KEY_EXCH_B: 481 dtls1_start_timer(s); 482 ret = dtls1_send_client_key_exchange(s); 483 if (ret <= 0) 484 goto end; 485 486#ifndef OPENSSL_NO_SCTP 487 /* 488 * Add new shared key for SCTP-Auth, will be ignored if no SCTP 489 * used. 490 */ 491 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 492 DTLS1_SCTP_AUTH_LABEL); 493 494 if (SSL_export_keying_material(s, sctpauthkey, 495 sizeof(sctpauthkey), labelbuffer, 496 sizeof(labelbuffer), NULL, 0, 0) <= 0) { 497 ret = -1; 498 s->state = SSL_ST_ERR; 499 goto end; 500 } 501 502 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 503 sizeof(sctpauthkey), sctpauthkey); 504#endif 505 506 /* 507 * EAY EAY EAY need to check for DH fix cert sent back 508 */ 509 /* 510 * For TLS, cert_req is set to 2, so a cert chain of nothing is 511 * sent, but no verify packet is sent 512 */ 513 if (s->s3->tmp.cert_req == 1) { 514 s->state = SSL3_ST_CW_CERT_VRFY_A; 515 } else { 516#ifndef OPENSSL_NO_SCTP 517 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 518 s->d1->next_state = SSL3_ST_CW_CHANGE_A; 519 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 520 } else 521#endif 522 s->state = SSL3_ST_CW_CHANGE_A; 523 } 524 525 s->init_num = 0; 526 break; 527 528 case SSL3_ST_CW_CERT_VRFY_A: 529 case SSL3_ST_CW_CERT_VRFY_B: 530 dtls1_start_timer(s); 531 ret = dtls1_send_client_verify(s); 532 if (ret <= 0) 533 goto end; 534#ifndef OPENSSL_NO_SCTP 535 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 536 s->d1->next_state = SSL3_ST_CW_CHANGE_A; 537 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 538 } else 539#endif 540 s->state = SSL3_ST_CW_CHANGE_A; 541 s->init_num = 0; 542 break; 543 544 case SSL3_ST_CW_CHANGE_A: 545 case SSL3_ST_CW_CHANGE_B: 546 if (!s->hit) 547 dtls1_start_timer(s); 548 ret = dtls1_send_change_cipher_spec(s, 549 SSL3_ST_CW_CHANGE_A, 550 SSL3_ST_CW_CHANGE_B); 551 if (ret <= 0) 552 goto end; 553 554 s->state = SSL3_ST_CW_FINISHED_A; 555 s->init_num = 0; 556 557 s->session->cipher = s->s3->tmp.new_cipher; 558#ifdef OPENSSL_NO_COMP 559 s->session->compress_meth = 0; 560#else 561 if (s->s3->tmp.new_compression == NULL) 562 s->session->compress_meth = 0; 563 else 564 s->session->compress_meth = s->s3->tmp.new_compression->id; 565#endif 566 if (!s->method->ssl3_enc->setup_key_block(s)) { 567 ret = -1; 568 s->state = SSL_ST_ERR; 569 goto end; 570 } 571 572 if (!s->method->ssl3_enc->change_cipher_state(s, 573 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 574 { 575 ret = -1; 576 s->state = SSL_ST_ERR; 577 goto end; 578 } 579#ifndef OPENSSL_NO_SCTP 580 if (s->hit) { 581 /* 582 * Change to new shared key of SCTP-Auth, will be ignored if 583 * no SCTP used. 584 */ 585 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 586 0, NULL); 587 } 588#endif 589 590 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 591 break; 592 593 case SSL3_ST_CW_FINISHED_A: 594 case SSL3_ST_CW_FINISHED_B: 595 if (!s->hit) 596 dtls1_start_timer(s); 597 ret = dtls1_send_finished(s, 598 SSL3_ST_CW_FINISHED_A, 599 SSL3_ST_CW_FINISHED_B, 600 s->method-> 601 ssl3_enc->client_finished_label, 602 s->method-> 603 ssl3_enc->client_finished_label_len); 604 if (ret <= 0) 605 goto end; 606 s->state = SSL3_ST_CW_FLUSH; 607 608 /* clear flags */ 609 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER; 610 if (s->hit) { 611 s->s3->tmp.next_state = SSL_ST_OK; 612#ifndef OPENSSL_NO_SCTP 613 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 614 s->d1->next_state = s->s3->tmp.next_state; 615 s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 616 } 617#endif 618 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) { 619 s->state = SSL_ST_OK; 620#ifndef OPENSSL_NO_SCTP 621 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 622 s->d1->next_state = SSL_ST_OK; 623 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 624 } 625#endif 626 s->s3->flags |= SSL3_FLAGS_POP_BUFFER; 627 s->s3->delay_buf_pop_ret = 0; 628 } 629 } else { 630#ifndef OPENSSL_NO_SCTP 631 /* 632 * Change to new shared key of SCTP-Auth, will be ignored if 633 * no SCTP used. 634 */ 635 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 636 0, NULL); 637#endif 638 639#ifndef OPENSSL_NO_TLSEXT 640 /* 641 * Allow NewSessionTicket if ticket expected 642 */ 643 if (s->tlsext_ticket_expected) 644 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A; 645 else 646#endif 647 648 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A; 649 } 650 s->init_num = 0; 651 break; 652 653#ifndef OPENSSL_NO_TLSEXT 654 case SSL3_ST_CR_SESSION_TICKET_A: 655 case SSL3_ST_CR_SESSION_TICKET_B: 656 ret = ssl3_get_new_session_ticket(s); 657 if (ret <= 0) 658 goto end; 659 s->state = SSL3_ST_CR_FINISHED_A; 660 s->init_num = 0; 661 break; 662 663 case SSL3_ST_CR_CERT_STATUS_A: 664 case SSL3_ST_CR_CERT_STATUS_B: 665 ret = ssl3_get_cert_status(s); 666 if (ret <= 0) 667 goto end; 668 s->state = SSL3_ST_CR_KEY_EXCH_A; 669 s->init_num = 0; 670 break; 671#endif 672 673 case SSL3_ST_CR_FINISHED_A: 674 case SSL3_ST_CR_FINISHED_B: 675 s->d1->change_cipher_spec_ok = 1; 676 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 677 SSL3_ST_CR_FINISHED_B); 678 if (ret <= 0) 679 goto end; 680 dtls1_stop_timer(s); 681 682 if (s->hit) 683 s->state = SSL3_ST_CW_CHANGE_A; 684 else 685 s->state = SSL_ST_OK; 686 687#ifndef OPENSSL_NO_SCTP 688 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 689 state == SSL_ST_RENEGOTIATE) { 690 s->d1->next_state = s->state; 691 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 692 } 693#endif 694 695 s->init_num = 0; 696 break; 697 698 case SSL3_ST_CW_FLUSH: 699 s->rwstate = SSL_WRITING; 700 if (BIO_flush(s->wbio) <= 0) { 701 /* 702 * If the write error was fatal, stop trying 703 */ 704 if (!BIO_should_retry(s->wbio)) { 705 s->rwstate = SSL_NOTHING; 706 s->state = s->s3->tmp.next_state; 707 } 708 709 ret = -1; 710 goto end; 711 } 712 s->rwstate = SSL_NOTHING; 713 s->state = s->s3->tmp.next_state; 714 break; 715 716 case SSL_ST_OK: 717 /* clean a few things up */ 718 ssl3_cleanup_key_block(s); 719 720#if 0 721 if (s->init_buf != NULL) { 722 BUF_MEM_free(s->init_buf); 723 s->init_buf = NULL; 724 } 725#endif 726 727 /* 728 * If we are not 'joining' the last two packets, remove the 729 * buffering now 730 */ 731 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 732 ssl_free_wbio_buffer(s); 733 /* else do it later in ssl3_write */ 734 735 s->init_num = 0; 736 s->renegotiate = 0; 737 s->new_session = 0; 738 739 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 740 if (s->hit) 741 s->ctx->stats.sess_hit++; 742 743 ret = 1; 744 /* s->server=0; */ 745 s->handshake_func = dtls1_connect; 746 s->ctx->stats.sess_connect_good++; 747 748 if (cb != NULL) 749 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 750 751 /* done with handshaking */ 752 s->d1->handshake_read_seq = 0; 753 s->d1->next_handshake_write_seq = 0; 754 dtls1_clear_received_buffer(s); 755 goto end; 756 /* break; */ 757 758 case SSL_ST_ERR: 759 default: 760 SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE); 761 ret = -1; 762 goto end; 763 /* break; */ 764 } 765 766 /* did we do anything */ 767 if (!s->s3->tmp.reuse_message && !skip) { 768 if (s->debug) { 769 if ((ret = BIO_flush(s->wbio)) <= 0) 770 goto end; 771 } 772 773 if ((cb != NULL) && (s->state != state)) { 774 new_state = s->state; 775 s->state = state; 776 cb(s, SSL_CB_CONNECT_LOOP, 1); 777 s->state = new_state; 778 } 779 } 780 skip = 0; 781 } 782 end: 783 s->in_handshake--; 784 785#ifndef OPENSSL_NO_SCTP 786 /* 787 * Notify SCTP BIO socket to leave handshake mode and allow stream 788 * identifier other than 0. Will be ignored if no SCTP is used. 789 */ 790 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 791 s->in_handshake, NULL); 792#endif 793 794 if (buf != NULL) 795 BUF_MEM_free(buf); 796 if (cb != NULL) 797 cb(s, SSL_CB_CONNECT_EXIT, ret); 798 return (ret); 799} 800 801int dtls1_client_hello(SSL *s) 802{ 803 unsigned char *buf; 804 unsigned char *p, *d; 805 unsigned int i, j; 806 unsigned long l; 807 SSL_COMP *comp; 808 809 buf = (unsigned char *)s->init_buf->data; 810 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) { 811 SSL_SESSION *sess = s->session; 812 if ((s->session == NULL) || (s->session->ssl_version != s->version) || 813#ifdef OPENSSL_NO_TLSEXT 814 !sess->session_id_length || 815#else 816 (!sess->session_id_length && !sess->tlsext_tick) || 817#endif 818 (s->session->not_resumable)) { 819 if (!ssl_get_new_session(s, 0)) 820 goto err; 821 } 822 /* else use the pre-loaded session */ 823 824 p = s->s3->client_random; 825 826 /* 827 * if client_random is initialized, reuse it, we are required to use 828 * same upon reply to HelloVerify 829 */ 830 for (i = 0; p[i] == '\0' && i < sizeof(s->s3->client_random); i++) ; 831 if (i == sizeof(s->s3->client_random)) 832 ssl_fill_hello_random(s, 0, p, sizeof(s->s3->client_random)); 833 834 /* Do the message type and length last */ 835 d = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 836 837 *(p++) = s->version >> 8; 838 *(p++) = s->version & 0xff; 839 s->client_version = s->version; 840 841 /* Random stuff */ 842 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 843 p += SSL3_RANDOM_SIZE; 844 845 /* Session ID */ 846 if (s->new_session) 847 i = 0; 848 else 849 i = s->session->session_id_length; 850 *(p++) = i; 851 if (i != 0) { 852 if (i > sizeof s->session->session_id) { 853 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 854 goto err; 855 } 856 memcpy(p, s->session->session_id, i); 857 p += i; 858 } 859 860 /* cookie stuff */ 861 if (s->d1->cookie_len > sizeof(s->d1->cookie)) { 862 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 863 goto err; 864 } 865 *(p++) = s->d1->cookie_len; 866 memcpy(p, s->d1->cookie, s->d1->cookie_len); 867 p += s->d1->cookie_len; 868 869 /* Ciphers supported */ 870 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0); 871 if (i == 0) { 872 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); 873 goto err; 874 } 875 s2n(i, p); 876 p += i; 877 878 /* COMPRESSION */ 879 if (s->ctx->comp_methods == NULL) 880 j = 0; 881 else 882 j = sk_SSL_COMP_num(s->ctx->comp_methods); 883 *(p++) = 1 + j; 884 for (i = 0; i < j; i++) { 885 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i); 886 *(p++) = comp->id; 887 } 888 *(p++) = 0; /* Add the NULL method */ 889 890#ifndef OPENSSL_NO_TLSEXT 891 /* TLS extensions */ 892 if (ssl_prepare_clienthello_tlsext(s) <= 0) { 893 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); 894 goto err; 895 } 896 if ((p = 897 ssl_add_clienthello_tlsext(s, p, 898 buf + SSL3_RT_MAX_PLAIN_LENGTH)) == 899 NULL) { 900 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 901 goto err; 902 } 903#endif 904 905 l = (p - d); 906 d = buf; 907 908 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l); 909 910 s->state = SSL3_ST_CW_CLNT_HELLO_B; 911 /* number of bytes to write */ 912 s->init_num = p - buf; 913 s->init_off = 0; 914 915 /* buffer the message to handle re-xmits */ 916 dtls1_buffer_message(s, 0); 917 } 918 919 /* SSL3_ST_CW_CLNT_HELLO_B */ 920 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 921 err: 922 return (-1); 923} 924 925static int dtls1_get_hello_verify(SSL *s) 926{ 927 int n, al, ok = 0; 928 unsigned char *data; 929 unsigned int cookie_len; 930 931 n = s->method->ssl_get_message(s, 932 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 933 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 934 -1, s->max_cert_list, &ok); 935 936 if (!ok) 937 return ((int)n); 938 939 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 940 s->d1->send_cookie = 0; 941 s->s3->tmp.reuse_message = 1; 942 return (1); 943 } 944 945 data = (unsigned char *)s->init_msg; 946 947 if ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))) { 948 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION); 949 s->version = (s->version & 0xff00) | data[1]; 950 al = SSL_AD_PROTOCOL_VERSION; 951 goto f_err; 952 } 953 data += 2; 954 955 cookie_len = *(data++); 956 if (cookie_len > sizeof(s->d1->cookie)) { 957 al = SSL_AD_ILLEGAL_PARAMETER; 958 goto f_err; 959 } 960 961 memcpy(s->d1->cookie, data, cookie_len); 962 s->d1->cookie_len = cookie_len; 963 964 s->d1->send_cookie = 1; 965 return 1; 966 967 f_err: 968 ssl3_send_alert(s, SSL3_AL_FATAL, al); 969 s->state = SSL_ST_ERR; 970 return -1; 971} 972 973int dtls1_send_client_key_exchange(SSL *s) 974{ 975 unsigned char *p, *d; 976 int n; 977 unsigned long alg_k; 978#ifndef OPENSSL_NO_RSA 979 unsigned char *q; 980 EVP_PKEY *pkey = NULL; 981#endif 982#ifndef OPENSSL_NO_KRB5 983 KSSL_ERR kssl_err; 984#endif /* OPENSSL_NO_KRB5 */ 985#ifndef OPENSSL_NO_ECDH 986 EC_KEY *clnt_ecdh = NULL; 987 const EC_POINT *srvr_ecpoint = NULL; 988 EVP_PKEY *srvr_pub_pkey = NULL; 989 unsigned char *encodedPoint = NULL; 990 int encoded_pt_len = 0; 991 BN_CTX *bn_ctx = NULL; 992#endif 993 994 if (s->state == SSL3_ST_CW_KEY_EXCH_A) { 995 d = (unsigned char *)s->init_buf->data; 996 p = &(d[DTLS1_HM_HEADER_LENGTH]); 997 998 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 999 1000 /* Fool emacs indentation */ 1001 if (0) { 1002 } 1003#ifndef OPENSSL_NO_RSA 1004 else if (alg_k & SSL_kRSA) { 1005 RSA *rsa; 1006 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 1007 1008 if (s->session->sess_cert == NULL) { 1009 /* 1010 * We should always have a server certificate with SSL_kRSA. 1011 */ 1012 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1013 ERR_R_INTERNAL_ERROR); 1014 goto err; 1015 } 1016 1017 if (s->session->sess_cert->peer_rsa_tmp != NULL) 1018 rsa = s->session->sess_cert->peer_rsa_tmp; 1019 else { 1020 pkey = 1021 X509_get_pubkey(s->session-> 1022 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC]. 1023 x509); 1024 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) 1025 || (pkey->pkey.rsa == NULL)) { 1026 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1027 ERR_R_INTERNAL_ERROR); 1028 goto err; 1029 } 1030 rsa = pkey->pkey.rsa; 1031 EVP_PKEY_free(pkey); 1032 } 1033 1034 tmp_buf[0] = s->client_version >> 8; 1035 tmp_buf[1] = s->client_version & 0xff; 1036 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0) 1037 goto err; 1038 1039 s->session->master_key_length = sizeof tmp_buf; 1040 1041 q = p; 1042 /* Fix buf for TLS and [incidentally] DTLS */ 1043 if (s->version > SSL3_VERSION) 1044 p += 2; 1045 n = RSA_public_encrypt(sizeof tmp_buf, 1046 tmp_buf, p, rsa, RSA_PKCS1_PADDING); 1047# ifdef PKCS1_CHECK 1048 if (s->options & SSL_OP_PKCS1_CHECK_1) 1049 p[1]++; 1050 if (s->options & SSL_OP_PKCS1_CHECK_2) 1051 tmp_buf[0] = 0x70; 1052# endif 1053 if (n <= 0) { 1054 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1055 SSL_R_BAD_RSA_ENCRYPT); 1056 goto err; 1057 } 1058 1059 /* Fix buf for TLS and [incidentally] DTLS */ 1060 if (s->version > SSL3_VERSION) { 1061 s2n(n, q); 1062 n += 2; 1063 } 1064 1065 s->session->master_key_length = 1066 s->method->ssl3_enc->generate_master_secret(s, 1067 s-> 1068 session->master_key, 1069 tmp_buf, 1070 sizeof tmp_buf); 1071 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 1072 } 1073#endif 1074#ifndef OPENSSL_NO_KRB5 1075 else if (alg_k & SSL_kKRB5) { 1076 krb5_error_code krb5rc; 1077 KSSL_CTX *kssl_ctx = s->kssl_ctx; 1078 /* krb5_data krb5_ap_req; */ 1079 krb5_data *enc_ticket; 1080 krb5_data authenticator, *authp = NULL; 1081 EVP_CIPHER_CTX ciph_ctx; 1082 const EVP_CIPHER *enc = NULL; 1083 unsigned char iv[EVP_MAX_IV_LENGTH]; 1084 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 1085 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH]; 1086 int padl, outl = sizeof(epms); 1087 1088 EVP_CIPHER_CTX_init(&ciph_ctx); 1089 1090# ifdef KSSL_DEBUG 1091 printf("ssl3_send_client_key_exchange(%lx & %lx)\n", 1092 alg_k, SSL_kKRB5); 1093# endif /* KSSL_DEBUG */ 1094 1095 authp = NULL; 1096# ifdef KRB5SENDAUTH 1097 if (KRB5SENDAUTH) 1098 authp = &authenticator; 1099# endif /* KRB5SENDAUTH */ 1100 1101 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err); 1102 enc = kssl_map_enc(kssl_ctx->enctype); 1103 if (enc == NULL) 1104 goto err; 1105# ifdef KSSL_DEBUG 1106 { 1107 printf("kssl_cget_tkt rtn %d\n", krb5rc); 1108 if (krb5rc && kssl_err.text) 1109 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 1110 } 1111# endif /* KSSL_DEBUG */ 1112 1113 if (krb5rc) { 1114 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1115 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason); 1116 goto err; 1117 } 1118 1119 /*- 1120 * 20010406 VRS - Earlier versions used KRB5 AP_REQ 1121 ** in place of RFC 2712 KerberosWrapper, as in: 1122 ** 1123 ** Send ticket (copy to *p, set n = length) 1124 ** n = krb5_ap_req.length; 1125 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 1126 ** if (krb5_ap_req.data) 1127 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 1128 ** 1129 ** Now using real RFC 2712 KerberosWrapper 1130 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) 1131 ** Note: 2712 "opaque" types are here replaced 1132 ** with a 2-byte length followed by the value. 1133 ** Example: 1134 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 1135 ** Where "xx xx" = length bytes. Shown here with 1136 ** optional authenticator omitted. 1137 */ 1138 1139 /* KerberosWrapper.Ticket */ 1140 s2n(enc_ticket->length, p); 1141 memcpy(p, enc_ticket->data, enc_ticket->length); 1142 p += enc_ticket->length; 1143 n = enc_ticket->length + 2; 1144 1145 /* KerberosWrapper.Authenticator */ 1146 if (authp && authp->length) { 1147 s2n(authp->length, p); 1148 memcpy(p, authp->data, authp->length); 1149 p += authp->length; 1150 n += authp->length + 2; 1151 1152 free(authp->data); 1153 authp->data = NULL; 1154 authp->length = 0; 1155 } else { 1156 s2n(0, p); /* null authenticator length */ 1157 n += 2; 1158 } 1159 1160 if (RAND_bytes(tmp_buf, sizeof tmp_buf) <= 0) 1161 goto err; 1162 1163 /*- 1164 * 20010420 VRS. Tried it this way; failed. 1165 * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 1166 * EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 1167 * kssl_ctx->length); 1168 * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 1169 */ 1170 1171 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 1172 EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv); 1173 EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf, 1174 sizeof tmp_buf); 1175 EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl); 1176 outl += padl; 1177 if (outl > (int)sizeof epms) { 1178 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1179 ERR_R_INTERNAL_ERROR); 1180 goto err; 1181 } 1182 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 1183 1184 /* KerberosWrapper.EncryptedPreMasterSecret */ 1185 s2n(outl, p); 1186 memcpy(p, epms, outl); 1187 p += outl; 1188 n += outl + 2; 1189 1190 s->session->master_key_length = 1191 s->method->ssl3_enc->generate_master_secret(s, 1192 s-> 1193 session->master_key, 1194 tmp_buf, 1195 sizeof tmp_buf); 1196 1197 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 1198 OPENSSL_cleanse(epms, outl); 1199 } 1200#endif 1201#ifndef OPENSSL_NO_DH 1202 else if (alg_k & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) { 1203 DH *dh_srvr, *dh_clnt; 1204 1205 if (s->session->sess_cert == NULL) { 1206 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1207 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1208 SSL_R_UNEXPECTED_MESSAGE); 1209 goto err; 1210 } 1211 1212 if (s->session->sess_cert->peer_dh_tmp != NULL) 1213 dh_srvr = s->session->sess_cert->peer_dh_tmp; 1214 else { 1215 /* we get them from the cert */ 1216 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1217 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1218 SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1219 goto err; 1220 } 1221 1222 /* generate a new random key */ 1223 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 1224 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 1225 goto err; 1226 } 1227 if (!DH_generate_key(dh_clnt)) { 1228 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 1229 goto err; 1230 } 1231 1232 /* 1233 * use the 'p' output buffer for the DH key, but make sure to 1234 * clear it out afterwards 1235 */ 1236 1237 n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt); 1238 1239 if (n <= 0) { 1240 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 1241 goto err; 1242 } 1243 1244 /* generate master key from the result */ 1245 s->session->master_key_length = 1246 s->method->ssl3_enc->generate_master_secret(s, 1247 s-> 1248 session->master_key, 1249 p, n); 1250 /* clean up */ 1251 memset(p, 0, n); 1252 1253 /* send off the data */ 1254 n = BN_num_bytes(dh_clnt->pub_key); 1255 s2n(n, p); 1256 BN_bn2bin(dh_clnt->pub_key, p); 1257 n += 2; 1258 1259 DH_free(dh_clnt); 1260 1261 /* perhaps clean things up a bit EAY EAY EAY EAY */ 1262 } 1263#endif 1264#ifndef OPENSSL_NO_ECDH 1265 else if (alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)) { 1266 const EC_GROUP *srvr_group = NULL; 1267 EC_KEY *tkey; 1268 int ecdh_clnt_cert = 0; 1269 int field_size = 0; 1270 1271 if (s->session->sess_cert == NULL) { 1272 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1273 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1274 SSL_R_UNEXPECTED_MESSAGE); 1275 goto err; 1276 } 1277 1278 /* 1279 * Did we send out the client's ECDH share for use in premaster 1280 * computation as part of client certificate? If so, set 1281 * ecdh_clnt_cert to 1. 1282 */ 1283 if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) { 1284 /* 1285 * XXX: For now, we do not support client authentication 1286 * using ECDH certificates. To add such support, one needs to 1287 * add code that checks for appropriate conditions and sets 1288 * ecdh_clnt_cert to 1. For example, the cert have an ECC key 1289 * on the same curve as the server's and the key should be 1290 * authorized for key agreement. One also needs to add code 1291 * in ssl3_connect to skip sending the certificate verify 1292 * message. if ((s->cert->key->privatekey != NULL) && 1293 * (s->cert->key->privatekey->type == EVP_PKEY_EC) && ...) 1294 * ecdh_clnt_cert = 1; 1295 */ 1296 } 1297 1298 if (s->session->sess_cert->peer_ecdh_tmp != NULL) { 1299 tkey = s->session->sess_cert->peer_ecdh_tmp; 1300 } else { 1301 /* Get the Server Public Key from Cert */ 1302 srvr_pub_pkey = 1303 X509_get_pubkey(s->session-> 1304 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1305 if ((srvr_pub_pkey == NULL) 1306 || (srvr_pub_pkey->type != EVP_PKEY_EC) 1307 || (srvr_pub_pkey->pkey.ec == NULL)) { 1308 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1309 ERR_R_INTERNAL_ERROR); 1310 goto err; 1311 } 1312 1313 tkey = srvr_pub_pkey->pkey.ec; 1314 } 1315 1316 srvr_group = EC_KEY_get0_group(tkey); 1317 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 1318 1319 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) { 1320 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1321 ERR_R_INTERNAL_ERROR); 1322 goto err; 1323 } 1324 1325 if ((clnt_ecdh = EC_KEY_new()) == NULL) { 1326 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1327 ERR_R_MALLOC_FAILURE); 1328 goto err; 1329 } 1330 1331 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) { 1332 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); 1333 goto err; 1334 } 1335 if (ecdh_clnt_cert) { 1336 /* 1337 * Reuse key info from our certificate We only need our 1338 * private key to perform the ECDH computation. 1339 */ 1340 const BIGNUM *priv_key; 1341 tkey = s->cert->key->privatekey->pkey.ec; 1342 priv_key = EC_KEY_get0_private_key(tkey); 1343 if (priv_key == NULL) { 1344 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1345 ERR_R_MALLOC_FAILURE); 1346 goto err; 1347 } 1348 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) { 1349 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1350 ERR_R_EC_LIB); 1351 goto err; 1352 } 1353 } else { 1354 /* Generate a new ECDH key pair */ 1355 if (!(EC_KEY_generate_key(clnt_ecdh))) { 1356 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1357 ERR_R_ECDH_LIB); 1358 goto err; 1359 } 1360 } 1361 1362 /* 1363 * use the 'p' output buffer for the ECDH key, but make sure to 1364 * clear it out afterwards 1365 */ 1366 1367 field_size = EC_GROUP_get_degree(srvr_group); 1368 if (field_size <= 0) { 1369 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1370 goto err; 1371 } 1372 n = ECDH_compute_key(p, (field_size + 7) / 8, srvr_ecpoint, 1373 clnt_ecdh, NULL); 1374 if (n <= 0) { 1375 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1376 goto err; 1377 } 1378 1379 /* generate master key from the result */ 1380 s->session->master_key_length = 1381 s->method->ssl3_enc->generate_master_secret(s, 1382 s-> 1383 session->master_key, 1384 p, n); 1385 1386 memset(p, 0, n); /* clean up */ 1387 1388 if (ecdh_clnt_cert) { 1389 /* Send empty client key exch message */ 1390 n = 0; 1391 } else { 1392 /* 1393 * First check the size of encoding and allocate memory 1394 * accordingly. 1395 */ 1396 encoded_pt_len = 1397 EC_POINT_point2oct(srvr_group, 1398 EC_KEY_get0_public_key(clnt_ecdh), 1399 POINT_CONVERSION_UNCOMPRESSED, 1400 NULL, 0, NULL); 1401 1402 encodedPoint = (unsigned char *) 1403 OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char)); 1404 bn_ctx = BN_CTX_new(); 1405 if ((encodedPoint == NULL) || (bn_ctx == NULL)) { 1406 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1407 ERR_R_MALLOC_FAILURE); 1408 goto err; 1409 } 1410 1411 /* Encode the public key */ 1412 n = EC_POINT_point2oct(srvr_group, 1413 EC_KEY_get0_public_key(clnt_ecdh), 1414 POINT_CONVERSION_UNCOMPRESSED, 1415 encodedPoint, encoded_pt_len, bn_ctx); 1416 1417 *p = n; /* length of encoded point */ 1418 /* Encoded point will be copied here */ 1419 p += 1; 1420 /* copy the point */ 1421 memcpy((unsigned char *)p, encodedPoint, n); 1422 /* increment n to account for length field */ 1423 n += 1; 1424 } 1425 1426 /* Free allocated memory */ 1427 BN_CTX_free(bn_ctx); 1428 if (encodedPoint != NULL) 1429 OPENSSL_free(encodedPoint); 1430 if (clnt_ecdh != NULL) 1431 EC_KEY_free(clnt_ecdh); 1432 EVP_PKEY_free(srvr_pub_pkey); 1433 } 1434#endif /* !OPENSSL_NO_ECDH */ 1435 1436#ifndef OPENSSL_NO_PSK 1437 else if (alg_k & SSL_kPSK) { 1438 char identity[PSK_MAX_IDENTITY_LEN]; 1439 unsigned char *t = NULL; 1440 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN * 2 + 4]; 1441 unsigned int pre_ms_len = 0, psk_len = 0; 1442 int psk_err = 1; 1443 1444 n = 0; 1445 if (s->psk_client_callback == NULL) { 1446 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1447 SSL_R_PSK_NO_CLIENT_CB); 1448 goto err; 1449 } 1450 1451 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint, 1452 identity, PSK_MAX_IDENTITY_LEN, 1453 psk_or_pre_ms, 1454 sizeof(psk_or_pre_ms)); 1455 if (psk_len > PSK_MAX_PSK_LEN) { 1456 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1457 ERR_R_INTERNAL_ERROR); 1458 goto psk_err; 1459 } else if (psk_len == 0) { 1460 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1461 SSL_R_PSK_IDENTITY_NOT_FOUND); 1462 goto psk_err; 1463 } 1464 1465 /* create PSK pre_master_secret */ 1466 pre_ms_len = 2 + psk_len + 2 + psk_len; 1467 t = psk_or_pre_ms; 1468 memmove(psk_or_pre_ms + psk_len + 4, psk_or_pre_ms, psk_len); 1469 s2n(psk_len, t); 1470 memset(t, 0, psk_len); 1471 t += psk_len; 1472 s2n(psk_len, t); 1473 1474 if (s->session->psk_identity_hint != NULL) 1475 OPENSSL_free(s->session->psk_identity_hint); 1476 s->session->psk_identity_hint = 1477 BUF_strdup(s->ctx->psk_identity_hint); 1478 if (s->ctx->psk_identity_hint != NULL 1479 && s->session->psk_identity_hint == NULL) { 1480 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1481 ERR_R_MALLOC_FAILURE); 1482 goto psk_err; 1483 } 1484 1485 if (s->session->psk_identity != NULL) 1486 OPENSSL_free(s->session->psk_identity); 1487 s->session->psk_identity = BUF_strdup(identity); 1488 if (s->session->psk_identity == NULL) { 1489 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1490 ERR_R_MALLOC_FAILURE); 1491 goto psk_err; 1492 } 1493 1494 s->session->master_key_length = 1495 s->method->ssl3_enc->generate_master_secret(s, 1496 s-> 1497 session->master_key, 1498 psk_or_pre_ms, 1499 pre_ms_len); 1500 n = strlen(identity); 1501 s2n(n, p); 1502 memcpy(p, identity, n); 1503 n += 2; 1504 psk_err = 0; 1505 psk_err: 1506 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN); 1507 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1508 if (psk_err != 0) { 1509 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1510 goto err; 1511 } 1512 } 1513#endif 1514 else { 1515 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1516 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1517 ERR_R_INTERNAL_ERROR); 1518 goto err; 1519 } 1520 1521 d = dtls1_set_message_header(s, d, 1522 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); 1523 /*- 1524 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 1525 l2n3(n,d); 1526 l2n(s->d1->handshake_write_seq,d); 1527 s->d1->handshake_write_seq++; 1528 */ 1529 1530 s->state = SSL3_ST_CW_KEY_EXCH_B; 1531 /* number of bytes to write */ 1532 s->init_num = n + DTLS1_HM_HEADER_LENGTH; 1533 s->init_off = 0; 1534 1535 /* buffer the message to handle re-xmits */ 1536 dtls1_buffer_message(s, 0); 1537 } 1538 1539 /* SSL3_ST_CW_KEY_EXCH_B */ 1540 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1541 err: 1542#ifndef OPENSSL_NO_ECDH 1543 BN_CTX_free(bn_ctx); 1544 if (encodedPoint != NULL) 1545 OPENSSL_free(encodedPoint); 1546 if (clnt_ecdh != NULL) 1547 EC_KEY_free(clnt_ecdh); 1548 EVP_PKEY_free(srvr_pub_pkey); 1549#endif 1550 return (-1); 1551} 1552 1553int dtls1_send_client_verify(SSL *s) 1554{ 1555 unsigned char *p, *d; 1556 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; 1557 EVP_PKEY *pkey; 1558#ifndef OPENSSL_NO_RSA 1559 unsigned u = 0; 1560#endif 1561 unsigned long n; 1562#if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA) 1563 int j; 1564#endif 1565 1566 if (s->state == SSL3_ST_CW_CERT_VRFY_A) { 1567 d = (unsigned char *)s->init_buf->data; 1568 p = &(d[DTLS1_HM_HEADER_LENGTH]); 1569 pkey = s->cert->key->privatekey; 1570 1571 s->method->ssl3_enc->cert_verify_mac(s, 1572 NID_sha1, 1573 &(data[MD5_DIGEST_LENGTH])); 1574 1575#ifndef OPENSSL_NO_RSA 1576 if (pkey->type == EVP_PKEY_RSA) { 1577 s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0])); 1578 if (RSA_sign(NID_md5_sha1, data, 1579 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, 1580 &(p[2]), &u, pkey->pkey.rsa) <= 0) { 1581 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB); 1582 goto err; 1583 } 1584 s2n(u, p); 1585 n = u + 2; 1586 } else 1587#endif 1588#ifndef OPENSSL_NO_DSA 1589 if (pkey->type == EVP_PKEY_DSA) { 1590 if (!DSA_sign(pkey->save_type, 1591 &(data[MD5_DIGEST_LENGTH]), 1592 SHA_DIGEST_LENGTH, &(p[2]), 1593 (unsigned int *)&j, pkey->pkey.dsa)) { 1594 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB); 1595 goto err; 1596 } 1597 s2n(j, p); 1598 n = j + 2; 1599 } else 1600#endif 1601#ifndef OPENSSL_NO_ECDSA 1602 if (pkey->type == EVP_PKEY_EC) { 1603 if (!ECDSA_sign(pkey->save_type, 1604 &(data[MD5_DIGEST_LENGTH]), 1605 SHA_DIGEST_LENGTH, &(p[2]), 1606 (unsigned int *)&j, pkey->pkey.ec)) { 1607 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB); 1608 goto err; 1609 } 1610 s2n(j, p); 1611 n = j + 2; 1612 } else 1613#endif 1614 { 1615 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); 1616 goto err; 1617 } 1618 1619 d = dtls1_set_message_header(s, d, 1620 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n); 1621 1622 s->init_num = (int)n + DTLS1_HM_HEADER_LENGTH; 1623 s->init_off = 0; 1624 1625 /* buffer the message to handle re-xmits */ 1626 dtls1_buffer_message(s, 0); 1627 1628 s->state = SSL3_ST_CW_CERT_VRFY_B; 1629 } 1630 1631 /* s->state = SSL3_ST_CW_CERT_VRFY_B */ 1632 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1633 err: 1634 return (-1); 1635} 1636 1637int dtls1_send_client_certificate(SSL *s) 1638{ 1639 X509 *x509 = NULL; 1640 EVP_PKEY *pkey = NULL; 1641 int i; 1642 unsigned long l; 1643 1644 if (s->state == SSL3_ST_CW_CERT_A) { 1645 if ((s->cert == NULL) || 1646 (s->cert->key->x509 == NULL) || 1647 (s->cert->key->privatekey == NULL)) 1648 s->state = SSL3_ST_CW_CERT_B; 1649 else 1650 s->state = SSL3_ST_CW_CERT_C; 1651 } 1652 1653 /* We need to get a client cert */ 1654 if (s->state == SSL3_ST_CW_CERT_B) { 1655 /* 1656 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP; 1657 * return(-1); We then get retied later 1658 */ 1659 i = 0; 1660 i = ssl_do_client_cert_cb(s, &x509, &pkey); 1661 if (i < 0) { 1662 s->rwstate = SSL_X509_LOOKUP; 1663 return (-1); 1664 } 1665 s->rwstate = SSL_NOTHING; 1666 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 1667 s->state = SSL3_ST_CW_CERT_B; 1668 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey)) 1669 i = 0; 1670 } else if (i == 1) { 1671 i = 0; 1672 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE, 1673 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 1674 } 1675 1676 if (x509 != NULL) 1677 X509_free(x509); 1678 if (pkey != NULL) 1679 EVP_PKEY_free(pkey); 1680 if (i == 0) { 1681 if (s->version == SSL3_VERSION) { 1682 s->s3->tmp.cert_req = 0; 1683 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE); 1684 return (1); 1685 } else { 1686 s->s3->tmp.cert_req = 2; 1687 } 1688 } 1689 1690 /* Ok, we have a cert */ 1691 s->state = SSL3_ST_CW_CERT_C; 1692 } 1693 1694 if (s->state == SSL3_ST_CW_CERT_C) { 1695 s->state = SSL3_ST_CW_CERT_D; 1696 l = dtls1_output_cert_chain(s, 1697 (s->s3->tmp.cert_req == 1698 2) ? NULL : s->cert->key->x509); 1699 if (!l) { 1700 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); 1701 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); 1702 return 0; 1703 } 1704 s->init_num = (int)l; 1705 s->init_off = 0; 1706 1707 /* set header called by dtls1_output_cert_chain() */ 1708 1709 /* buffer the message to handle re-xmits */ 1710 dtls1_buffer_message(s, 0); 1711 } 1712 /* SSL3_ST_CW_CERT_D */ 1713 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1714} 1715