d1_clnt.c revision 280304
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 goto end; 216 } 217 218 /* s->version=SSL3_VERSION; */ 219 s->type = SSL_ST_CONNECT; 220 221 if (s->init_buf == NULL) { 222 if ((buf = BUF_MEM_new()) == NULL) { 223 ret = -1; 224 goto end; 225 } 226 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { 227 ret = -1; 228 goto end; 229 } 230 s->init_buf = buf; 231 buf = NULL; 232 } 233 234 if (!ssl3_setup_buffers(s)) { 235 ret = -1; 236 goto end; 237 } 238 239 /* setup buffing BIO */ 240 if (!ssl_init_wbio_buffer(s, 0)) { 241 ret = -1; 242 goto end; 243 } 244 245 /* don't push the buffering BIO quite yet */ 246 247 s->state = SSL3_ST_CW_CLNT_HELLO_A; 248 s->ctx->stats.sess_connect++; 249 s->init_num = 0; 250 /* mark client_random uninitialized */ 251 memset(s->s3->client_random, 0, sizeof(s->s3->client_random)); 252 s->d1->send_cookie = 0; 253 s->hit = 0; 254 s->d1->change_cipher_spec_ok = 0; 255 /* 256 * Should have been reset by ssl3_get_finished, too. 257 */ 258 s->s3->change_cipher_spec = 0; 259 break; 260 261#ifndef OPENSSL_NO_SCTP 262 case DTLS1_SCTP_ST_CR_READ_SOCK: 263 264 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { 265 s->s3->in_read_app_data = 2; 266 s->rwstate = SSL_READING; 267 BIO_clear_retry_flags(SSL_get_rbio(s)); 268 BIO_set_retry_read(SSL_get_rbio(s)); 269 ret = -1; 270 goto end; 271 } 272 273 s->state = s->s3->tmp.next_state; 274 break; 275 276 case DTLS1_SCTP_ST_CW_WRITE_SOCK: 277 /* read app data until dry event */ 278 279 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 280 if (ret < 0) 281 goto end; 282 283 if (ret == 0) { 284 s->s3->in_read_app_data = 2; 285 s->rwstate = SSL_READING; 286 BIO_clear_retry_flags(SSL_get_rbio(s)); 287 BIO_set_retry_read(SSL_get_rbio(s)); 288 ret = -1; 289 goto end; 290 } 291 292 s->state = s->d1->next_state; 293 break; 294#endif 295 296 case SSL3_ST_CW_CLNT_HELLO_A: 297 case SSL3_ST_CW_CLNT_HELLO_B: 298 299 s->shutdown = 0; 300 301 /* every DTLS ClientHello resets Finished MAC */ 302 ssl3_init_finished_mac(s); 303 304 dtls1_start_timer(s); 305 ret = dtls1_client_hello(s); 306 if (ret <= 0) 307 goto end; 308 309 if (s->d1->send_cookie) { 310 s->state = SSL3_ST_CW_FLUSH; 311 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A; 312 } else 313 s->state = SSL3_ST_CR_SRVR_HELLO_A; 314 315 s->init_num = 0; 316 317#ifndef OPENSSL_NO_SCTP 318 /* Disable buffering for SCTP */ 319 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) { 320#endif 321 /* 322 * turn on buffering for the next lot of output 323 */ 324 if (s->bbio != s->wbio) 325 s->wbio = BIO_push(s->bbio, s->wbio); 326#ifndef OPENSSL_NO_SCTP 327 } 328#endif 329 330 break; 331 332 case SSL3_ST_CR_SRVR_HELLO_A: 333 case SSL3_ST_CR_SRVR_HELLO_B: 334 ret = ssl3_get_server_hello(s); 335 if (ret <= 0) 336 goto end; 337 else { 338 if (s->hit) { 339#ifndef OPENSSL_NO_SCTP 340 /* 341 * Add new shared key for SCTP-Auth, will be ignored if 342 * no SCTP used. 343 */ 344 snprintf((char *)labelbuffer, 345 sizeof(DTLS1_SCTP_AUTH_LABEL), 346 DTLS1_SCTP_AUTH_LABEL); 347 348 SSL_export_keying_material(s, sctpauthkey, 349 sizeof(sctpauthkey), 350 labelbuffer, 351 sizeof(labelbuffer), NULL, 0, 352 0); 353 354 BIO_ctrl(SSL_get_wbio(s), 355 BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 356 sizeof(sctpauthkey), sctpauthkey); 357#endif 358 359 s->state = SSL3_ST_CR_FINISHED_A; 360 } else 361 s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 362 } 363 s->init_num = 0; 364 break; 365 366 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 367 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 368 369 ret = dtls1_get_hello_verify(s); 370 if (ret <= 0) 371 goto end; 372 dtls1_stop_timer(s); 373 if (s->d1->send_cookie) /* start again, with a cookie */ 374 s->state = SSL3_ST_CW_CLNT_HELLO_A; 375 else 376 s->state = SSL3_ST_CR_CERT_A; 377 s->init_num = 0; 378 break; 379 380 case SSL3_ST_CR_CERT_A: 381 case SSL3_ST_CR_CERT_B: 382 /* Check if it is anon DH or PSK */ 383 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 384 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 385 ret = ssl3_get_server_certificate(s); 386 if (ret <= 0) 387 goto end; 388#ifndef OPENSSL_NO_TLSEXT 389 if (s->tlsext_status_expected) 390 s->state = SSL3_ST_CR_CERT_STATUS_A; 391 else 392 s->state = SSL3_ST_CR_KEY_EXCH_A; 393 } else { 394 skip = 1; 395 s->state = SSL3_ST_CR_KEY_EXCH_A; 396 } 397#else 398 } else 399 skip = 1; 400 401 s->state = SSL3_ST_CR_KEY_EXCH_A; 402#endif 403 s->init_num = 0; 404 break; 405 406 case SSL3_ST_CR_KEY_EXCH_A: 407 case SSL3_ST_CR_KEY_EXCH_B: 408 ret = ssl3_get_key_exchange(s); 409 if (ret <= 0) 410 goto end; 411 s->state = SSL3_ST_CR_CERT_REQ_A; 412 s->init_num = 0; 413 414 /* 415 * at this point we check that we have the required stuff from 416 * the server 417 */ 418 if (!ssl3_check_cert_and_algorithm(s)) { 419 ret = -1; 420 goto end; 421 } 422 break; 423 424 case SSL3_ST_CR_CERT_REQ_A: 425 case SSL3_ST_CR_CERT_REQ_B: 426 ret = ssl3_get_certificate_request(s); 427 if (ret <= 0) 428 goto end; 429 s->state = SSL3_ST_CR_SRVR_DONE_A; 430 s->init_num = 0; 431 break; 432 433 case SSL3_ST_CR_SRVR_DONE_A: 434 case SSL3_ST_CR_SRVR_DONE_B: 435 ret = ssl3_get_server_done(s); 436 if (ret <= 0) 437 goto end; 438 dtls1_stop_timer(s); 439 if (s->s3->tmp.cert_req) 440 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A; 441 else 442 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A; 443 s->init_num = 0; 444 445#ifndef OPENSSL_NO_SCTP 446 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 447 state == SSL_ST_RENEGOTIATE) 448 s->state = DTLS1_SCTP_ST_CR_READ_SOCK; 449 else 450#endif 451 s->state = s->s3->tmp.next_state; 452 break; 453 454 case SSL3_ST_CW_CERT_A: 455 case SSL3_ST_CW_CERT_B: 456 case SSL3_ST_CW_CERT_C: 457 case SSL3_ST_CW_CERT_D: 458 dtls1_start_timer(s); 459 ret = dtls1_send_client_certificate(s); 460 if (ret <= 0) 461 goto end; 462 s->state = SSL3_ST_CW_KEY_EXCH_A; 463 s->init_num = 0; 464 break; 465 466 case SSL3_ST_CW_KEY_EXCH_A: 467 case SSL3_ST_CW_KEY_EXCH_B: 468 dtls1_start_timer(s); 469 ret = dtls1_send_client_key_exchange(s); 470 if (ret <= 0) 471 goto end; 472 473#ifndef OPENSSL_NO_SCTP 474 /* 475 * Add new shared key for SCTP-Auth, will be ignored if no SCTP 476 * used. 477 */ 478 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 479 DTLS1_SCTP_AUTH_LABEL); 480 481 SSL_export_keying_material(s, sctpauthkey, 482 sizeof(sctpauthkey), labelbuffer, 483 sizeof(labelbuffer), NULL, 0, 0); 484 485 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 486 sizeof(sctpauthkey), sctpauthkey); 487#endif 488 489 /* 490 * EAY EAY EAY need to check for DH fix cert sent back 491 */ 492 /* 493 * For TLS, cert_req is set to 2, so a cert chain of nothing is 494 * sent, but no verify packet is sent 495 */ 496 if (s->s3->tmp.cert_req == 1) { 497 s->state = SSL3_ST_CW_CERT_VRFY_A; 498 } else { 499#ifndef OPENSSL_NO_SCTP 500 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 501 s->d1->next_state = SSL3_ST_CW_CHANGE_A; 502 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 503 } else 504#endif 505 s->state = SSL3_ST_CW_CHANGE_A; 506 } 507 508 s->init_num = 0; 509 break; 510 511 case SSL3_ST_CW_CERT_VRFY_A: 512 case SSL3_ST_CW_CERT_VRFY_B: 513 dtls1_start_timer(s); 514 ret = dtls1_send_client_verify(s); 515 if (ret <= 0) 516 goto end; 517#ifndef OPENSSL_NO_SCTP 518 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 519 s->d1->next_state = SSL3_ST_CW_CHANGE_A; 520 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 521 } else 522#endif 523 s->state = SSL3_ST_CW_CHANGE_A; 524 s->init_num = 0; 525 break; 526 527 case SSL3_ST_CW_CHANGE_A: 528 case SSL3_ST_CW_CHANGE_B: 529 if (!s->hit) 530 dtls1_start_timer(s); 531 ret = dtls1_send_change_cipher_spec(s, 532 SSL3_ST_CW_CHANGE_A, 533 SSL3_ST_CW_CHANGE_B); 534 if (ret <= 0) 535 goto end; 536 537 s->state = SSL3_ST_CW_FINISHED_A; 538 s->init_num = 0; 539 540 s->session->cipher = s->s3->tmp.new_cipher; 541#ifdef OPENSSL_NO_COMP 542 s->session->compress_meth = 0; 543#else 544 if (s->s3->tmp.new_compression == NULL) 545 s->session->compress_meth = 0; 546 else 547 s->session->compress_meth = s->s3->tmp.new_compression->id; 548#endif 549 if (!s->method->ssl3_enc->setup_key_block(s)) { 550 ret = -1; 551 goto end; 552 } 553 554 if (!s->method->ssl3_enc->change_cipher_state(s, 555 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 556 { 557 ret = -1; 558 goto end; 559 } 560#ifndef OPENSSL_NO_SCTP 561 if (s->hit) { 562 /* 563 * Change to new shared key of SCTP-Auth, will be ignored if 564 * no SCTP used. 565 */ 566 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 567 0, NULL); 568 } 569#endif 570 571 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 572 break; 573 574 case SSL3_ST_CW_FINISHED_A: 575 case SSL3_ST_CW_FINISHED_B: 576 if (!s->hit) 577 dtls1_start_timer(s); 578 ret = dtls1_send_finished(s, 579 SSL3_ST_CW_FINISHED_A, 580 SSL3_ST_CW_FINISHED_B, 581 s->method-> 582 ssl3_enc->client_finished_label, 583 s->method-> 584 ssl3_enc->client_finished_label_len); 585 if (ret <= 0) 586 goto end; 587 s->state = SSL3_ST_CW_FLUSH; 588 589 /* clear flags */ 590 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER; 591 if (s->hit) { 592 s->s3->tmp.next_state = SSL_ST_OK; 593#ifndef OPENSSL_NO_SCTP 594 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 595 s->d1->next_state = s->s3->tmp.next_state; 596 s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 597 } 598#endif 599 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) { 600 s->state = SSL_ST_OK; 601#ifndef OPENSSL_NO_SCTP 602 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 603 s->d1->next_state = SSL_ST_OK; 604 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 605 } 606#endif 607 s->s3->flags |= SSL3_FLAGS_POP_BUFFER; 608 s->s3->delay_buf_pop_ret = 0; 609 } 610 } else { 611#ifndef OPENSSL_NO_SCTP 612 /* 613 * Change to new shared key of SCTP-Auth, will be ignored if 614 * no SCTP used. 615 */ 616 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 617 0, NULL); 618#endif 619 620#ifndef OPENSSL_NO_TLSEXT 621 /* 622 * Allow NewSessionTicket if ticket expected 623 */ 624 if (s->tlsext_ticket_expected) 625 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A; 626 else 627#endif 628 629 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A; 630 } 631 s->init_num = 0; 632 break; 633 634#ifndef OPENSSL_NO_TLSEXT 635 case SSL3_ST_CR_SESSION_TICKET_A: 636 case SSL3_ST_CR_SESSION_TICKET_B: 637 ret = ssl3_get_new_session_ticket(s); 638 if (ret <= 0) 639 goto end; 640 s->state = SSL3_ST_CR_FINISHED_A; 641 s->init_num = 0; 642 break; 643 644 case SSL3_ST_CR_CERT_STATUS_A: 645 case SSL3_ST_CR_CERT_STATUS_B: 646 ret = ssl3_get_cert_status(s); 647 if (ret <= 0) 648 goto end; 649 s->state = SSL3_ST_CR_KEY_EXCH_A; 650 s->init_num = 0; 651 break; 652#endif 653 654 case SSL3_ST_CR_FINISHED_A: 655 case SSL3_ST_CR_FINISHED_B: 656 s->d1->change_cipher_spec_ok = 1; 657 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 658 SSL3_ST_CR_FINISHED_B); 659 if (ret <= 0) 660 goto end; 661 dtls1_stop_timer(s); 662 663 if (s->hit) 664 s->state = SSL3_ST_CW_CHANGE_A; 665 else 666 s->state = SSL_ST_OK; 667 668#ifndef OPENSSL_NO_SCTP 669 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 670 state == SSL_ST_RENEGOTIATE) { 671 s->d1->next_state = s->state; 672 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 673 } 674#endif 675 676 s->init_num = 0; 677 break; 678 679 case SSL3_ST_CW_FLUSH: 680 s->rwstate = SSL_WRITING; 681 if (BIO_flush(s->wbio) <= 0) { 682 /* 683 * If the write error was fatal, stop trying 684 */ 685 if (!BIO_should_retry(s->wbio)) { 686 s->rwstate = SSL_NOTHING; 687 s->state = s->s3->tmp.next_state; 688 } 689 690 ret = -1; 691 goto end; 692 } 693 s->rwstate = SSL_NOTHING; 694 s->state = s->s3->tmp.next_state; 695 break; 696 697 case SSL_ST_OK: 698 /* clean a few things up */ 699 ssl3_cleanup_key_block(s); 700 701#if 0 702 if (s->init_buf != NULL) { 703 BUF_MEM_free(s->init_buf); 704 s->init_buf = NULL; 705 } 706#endif 707 708 /* 709 * If we are not 'joining' the last two packets, remove the 710 * buffering now 711 */ 712 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 713 ssl_free_wbio_buffer(s); 714 /* else do it later in ssl3_write */ 715 716 s->init_num = 0; 717 s->renegotiate = 0; 718 s->new_session = 0; 719 720 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 721 if (s->hit) 722 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) 730 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 731 732 /* done with handshaking */ 733 s->d1->handshake_read_seq = 0; 734 s->d1->next_handshake_write_seq = 0; 735 goto end; 736 /* break; */ 737 738 default: 739 SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE); 740 ret = -1; 741 goto end; 742 /* break; */ 743 } 744 745 /* did we do anything */ 746 if (!s->s3->tmp.reuse_message && !skip) { 747 if (s->debug) { 748 if ((ret = BIO_flush(s->wbio)) <= 0) 749 goto end; 750 } 751 752 if ((cb != NULL) && (s->state != state)) { 753 new_state = s->state; 754 s->state = state; 755 cb(s, SSL_CB_CONNECT_LOOP, 1); 756 s->state = new_state; 757 } 758 } 759 skip = 0; 760 } 761 end: 762 s->in_handshake--; 763 764#ifndef OPENSSL_NO_SCTP 765 /* 766 * Notify SCTP BIO socket to leave handshake mode and allow stream 767 * identifier other than 0. Will be ignored if no SCTP is used. 768 */ 769 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 770 s->in_handshake, NULL); 771#endif 772 773 if (buf != NULL) 774 BUF_MEM_free(buf); 775 if (cb != NULL) 776 cb(s, SSL_CB_CONNECT_EXIT, ret); 777 return (ret); 778} 779 780int dtls1_client_hello(SSL *s) 781{ 782 unsigned char *buf; 783 unsigned char *p, *d; 784 unsigned int i, j; 785 unsigned long l; 786 SSL_COMP *comp; 787 788 buf = (unsigned char *)s->init_buf->data; 789 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) { 790 SSL_SESSION *sess = s->session; 791 if ((s->session == NULL) || (s->session->ssl_version != s->version) || 792#ifdef OPENSSL_NO_TLSEXT 793 !sess->session_id_length || 794#else 795 (!sess->session_id_length && !sess->tlsext_tick) || 796#endif 797 (s->session->not_resumable)) { 798 if (!ssl_get_new_session(s, 0)) 799 goto err; 800 } 801 /* else use the pre-loaded session */ 802 803 p = s->s3->client_random; 804 805 /* 806 * if client_random is initialized, reuse it, we are required to use 807 * same upon reply to HelloVerify 808 */ 809 for (i = 0; p[i] == '\0' && i < sizeof(s->s3->client_random); i++) ; 810 if (i == sizeof(s->s3->client_random)) 811 ssl_fill_hello_random(s, 0, p, sizeof(s->s3->client_random)); 812 813 /* Do the message type and length last */ 814 d = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 815 816 *(p++) = s->version >> 8; 817 *(p++) = s->version & 0xff; 818 s->client_version = s->version; 819 820 /* Random stuff */ 821 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 822 p += SSL3_RANDOM_SIZE; 823 824 /* Session ID */ 825 if (s->new_session) 826 i = 0; 827 else 828 i = s->session->session_id_length; 829 *(p++) = i; 830 if (i != 0) { 831 if (i > sizeof s->session->session_id) { 832 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 833 goto err; 834 } 835 memcpy(p, s->session->session_id, i); 836 p += i; 837 } 838 839 /* cookie stuff */ 840 if (s->d1->cookie_len > sizeof(s->d1->cookie)) { 841 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 842 goto err; 843 } 844 *(p++) = s->d1->cookie_len; 845 memcpy(p, s->d1->cookie, s->d1->cookie_len); 846 p += s->d1->cookie_len; 847 848 /* Ciphers supported */ 849 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0); 850 if (i == 0) { 851 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); 852 goto err; 853 } 854 s2n(i, p); 855 p += i; 856 857 /* COMPRESSION */ 858 if (s->ctx->comp_methods == NULL) 859 j = 0; 860 else 861 j = sk_SSL_COMP_num(s->ctx->comp_methods); 862 *(p++) = 1 + j; 863 for (i = 0; i < j; i++) { 864 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i); 865 *(p++) = comp->id; 866 } 867 *(p++) = 0; /* Add the NULL method */ 868 869#ifndef OPENSSL_NO_TLSEXT 870 /* TLS extensions */ 871 if (ssl_prepare_clienthello_tlsext(s) <= 0) { 872 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); 873 goto err; 874 } 875 if ((p = 876 ssl_add_clienthello_tlsext(s, p, 877 buf + SSL3_RT_MAX_PLAIN_LENGTH)) == 878 NULL) { 879 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 880 goto err; 881 } 882#endif 883 884 l = (p - d); 885 d = buf; 886 887 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l); 888 889 s->state = SSL3_ST_CW_CLNT_HELLO_B; 890 /* number of bytes to write */ 891 s->init_num = p - buf; 892 s->init_off = 0; 893 894 /* buffer the message to handle re-xmits */ 895 dtls1_buffer_message(s, 0); 896 } 897 898 /* SSL3_ST_CW_CLNT_HELLO_B */ 899 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 900 err: 901 return (-1); 902} 903 904static int dtls1_get_hello_verify(SSL *s) 905{ 906 int n, al, ok = 0; 907 unsigned char *data; 908 unsigned int cookie_len; 909 910 n = s->method->ssl_get_message(s, 911 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 912 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 913 -1, s->max_cert_list, &ok); 914 915 if (!ok) 916 return ((int)n); 917 918 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 919 s->d1->send_cookie = 0; 920 s->s3->tmp.reuse_message = 1; 921 return (1); 922 } 923 924 data = (unsigned char *)s->init_msg; 925 926 if ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))) { 927 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION); 928 s->version = (s->version & 0xff00) | data[1]; 929 al = SSL_AD_PROTOCOL_VERSION; 930 goto f_err; 931 } 932 data += 2; 933 934 cookie_len = *(data++); 935 if (cookie_len > sizeof(s->d1->cookie)) { 936 al = SSL_AD_ILLEGAL_PARAMETER; 937 goto f_err; 938 } 939 940 memcpy(s->d1->cookie, data, cookie_len); 941 s->d1->cookie_len = cookie_len; 942 943 s->d1->send_cookie = 1; 944 return 1; 945 946 f_err: 947 ssl3_send_alert(s, SSL3_AL_FATAL, al); 948 return -1; 949} 950 951int dtls1_send_client_key_exchange(SSL *s) 952{ 953 unsigned char *p, *d; 954 int n; 955 unsigned long alg_k; 956#ifndef OPENSSL_NO_RSA 957 unsigned char *q; 958 EVP_PKEY *pkey = NULL; 959#endif 960#ifndef OPENSSL_NO_KRB5 961 KSSL_ERR kssl_err; 962#endif /* OPENSSL_NO_KRB5 */ 963#ifndef OPENSSL_NO_ECDH 964 EC_KEY *clnt_ecdh = NULL; 965 const EC_POINT *srvr_ecpoint = NULL; 966 EVP_PKEY *srvr_pub_pkey = NULL; 967 unsigned char *encodedPoint = NULL; 968 int encoded_pt_len = 0; 969 BN_CTX *bn_ctx = NULL; 970#endif 971 972 if (s->state == SSL3_ST_CW_KEY_EXCH_A) { 973 d = (unsigned char *)s->init_buf->data; 974 p = &(d[DTLS1_HM_HEADER_LENGTH]); 975 976 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 977 978 /* Fool emacs indentation */ 979 if (0) { 980 } 981#ifndef OPENSSL_NO_RSA 982 else if (alg_k & SSL_kRSA) { 983 RSA *rsa; 984 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 985 986 if (s->session->sess_cert == NULL) { 987 /* 988 * We should always have a server certificate with SSL_kRSA. 989 */ 990 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 991 ERR_R_INTERNAL_ERROR); 992 goto err; 993 } 994 995 if (s->session->sess_cert->peer_rsa_tmp != NULL) 996 rsa = s->session->sess_cert->peer_rsa_tmp; 997 else { 998 pkey = 999 X509_get_pubkey(s->session-> 1000 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC]. 1001 x509); 1002 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) 1003 || (pkey->pkey.rsa == NULL)) { 1004 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1005 ERR_R_INTERNAL_ERROR); 1006 goto err; 1007 } 1008 rsa = pkey->pkey.rsa; 1009 EVP_PKEY_free(pkey); 1010 } 1011 1012 tmp_buf[0] = s->client_version >> 8; 1013 tmp_buf[1] = s->client_version & 0xff; 1014 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0) 1015 goto err; 1016 1017 s->session->master_key_length = sizeof tmp_buf; 1018 1019 q = p; 1020 /* Fix buf for TLS and [incidentally] DTLS */ 1021 if (s->version > SSL3_VERSION) 1022 p += 2; 1023 n = RSA_public_encrypt(sizeof tmp_buf, 1024 tmp_buf, p, rsa, RSA_PKCS1_PADDING); 1025# ifdef PKCS1_CHECK 1026 if (s->options & SSL_OP_PKCS1_CHECK_1) 1027 p[1]++; 1028 if (s->options & SSL_OP_PKCS1_CHECK_2) 1029 tmp_buf[0] = 0x70; 1030# endif 1031 if (n <= 0) { 1032 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1033 SSL_R_BAD_RSA_ENCRYPT); 1034 goto err; 1035 } 1036 1037 /* Fix buf for TLS and [incidentally] DTLS */ 1038 if (s->version > SSL3_VERSION) { 1039 s2n(n, q); 1040 n += 2; 1041 } 1042 1043 s->session->master_key_length = 1044 s->method->ssl3_enc->generate_master_secret(s, 1045 s-> 1046 session->master_key, 1047 tmp_buf, 1048 sizeof tmp_buf); 1049 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 1050 } 1051#endif 1052#ifndef OPENSSL_NO_KRB5 1053 else if (alg_k & SSL_kKRB5) { 1054 krb5_error_code krb5rc; 1055 KSSL_CTX *kssl_ctx = s->kssl_ctx; 1056 /* krb5_data krb5_ap_req; */ 1057 krb5_data *enc_ticket; 1058 krb5_data authenticator, *authp = NULL; 1059 EVP_CIPHER_CTX ciph_ctx; 1060 const EVP_CIPHER *enc = NULL; 1061 unsigned char iv[EVP_MAX_IV_LENGTH]; 1062 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 1063 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH]; 1064 int padl, outl = sizeof(epms); 1065 1066 EVP_CIPHER_CTX_init(&ciph_ctx); 1067 1068# ifdef KSSL_DEBUG 1069 printf("ssl3_send_client_key_exchange(%lx & %lx)\n", 1070 alg_k, SSL_kKRB5); 1071# endif /* KSSL_DEBUG */ 1072 1073 authp = NULL; 1074# ifdef KRB5SENDAUTH 1075 if (KRB5SENDAUTH) 1076 authp = &authenticator; 1077# endif /* KRB5SENDAUTH */ 1078 1079 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err); 1080 enc = kssl_map_enc(kssl_ctx->enctype); 1081 if (enc == NULL) 1082 goto err; 1083# ifdef KSSL_DEBUG 1084 { 1085 printf("kssl_cget_tkt rtn %d\n", krb5rc); 1086 if (krb5rc && kssl_err.text) 1087 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 1088 } 1089# endif /* KSSL_DEBUG */ 1090 1091 if (krb5rc) { 1092 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1093 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason); 1094 goto err; 1095 } 1096 1097 /*- 1098 * 20010406 VRS - Earlier versions used KRB5 AP_REQ 1099 ** in place of RFC 2712 KerberosWrapper, as in: 1100 ** 1101 ** Send ticket (copy to *p, set n = length) 1102 ** n = krb5_ap_req.length; 1103 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 1104 ** if (krb5_ap_req.data) 1105 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 1106 ** 1107 ** Now using real RFC 2712 KerberosWrapper 1108 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) 1109 ** Note: 2712 "opaque" types are here replaced 1110 ** with a 2-byte length followed by the value. 1111 ** Example: 1112 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 1113 ** Where "xx xx" = length bytes. Shown here with 1114 ** optional authenticator omitted. 1115 */ 1116 1117 /* KerberosWrapper.Ticket */ 1118 s2n(enc_ticket->length, p); 1119 memcpy(p, enc_ticket->data, enc_ticket->length); 1120 p += enc_ticket->length; 1121 n = enc_ticket->length + 2; 1122 1123 /* KerberosWrapper.Authenticator */ 1124 if (authp && authp->length) { 1125 s2n(authp->length, p); 1126 memcpy(p, authp->data, authp->length); 1127 p += authp->length; 1128 n += authp->length + 2; 1129 1130 free(authp->data); 1131 authp->data = NULL; 1132 authp->length = 0; 1133 } else { 1134 s2n(0, p); /* null authenticator length */ 1135 n += 2; 1136 } 1137 1138 if (RAND_bytes(tmp_buf, sizeof tmp_buf) <= 0) 1139 goto err; 1140 1141 /*- 1142 * 20010420 VRS. Tried it this way; failed. 1143 * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 1144 * EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 1145 * kssl_ctx->length); 1146 * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 1147 */ 1148 1149 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 1150 EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv); 1151 EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf, 1152 sizeof tmp_buf); 1153 EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl); 1154 outl += padl; 1155 if (outl > (int)sizeof epms) { 1156 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1157 ERR_R_INTERNAL_ERROR); 1158 goto err; 1159 } 1160 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 1161 1162 /* KerberosWrapper.EncryptedPreMasterSecret */ 1163 s2n(outl, p); 1164 memcpy(p, epms, outl); 1165 p += outl; 1166 n += outl + 2; 1167 1168 s->session->master_key_length = 1169 s->method->ssl3_enc->generate_master_secret(s, 1170 s-> 1171 session->master_key, 1172 tmp_buf, 1173 sizeof tmp_buf); 1174 1175 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 1176 OPENSSL_cleanse(epms, outl); 1177 } 1178#endif 1179#ifndef OPENSSL_NO_DH 1180 else if (alg_k & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) { 1181 DH *dh_srvr, *dh_clnt; 1182 1183 if (s->session->sess_cert == NULL) { 1184 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1185 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1186 SSL_R_UNEXPECTED_MESSAGE); 1187 goto err; 1188 } 1189 1190 if (s->session->sess_cert->peer_dh_tmp != NULL) 1191 dh_srvr = s->session->sess_cert->peer_dh_tmp; 1192 else { 1193 /* we get them from the cert */ 1194 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1195 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1196 SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1197 goto err; 1198 } 1199 1200 /* generate a new random key */ 1201 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 1202 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 1203 goto err; 1204 } 1205 if (!DH_generate_key(dh_clnt)) { 1206 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 1207 goto err; 1208 } 1209 1210 /* 1211 * use the 'p' output buffer for the DH key, but make sure to 1212 * clear it out afterwards 1213 */ 1214 1215 n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt); 1216 1217 if (n <= 0) { 1218 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 1219 goto err; 1220 } 1221 1222 /* generate master key from the result */ 1223 s->session->master_key_length = 1224 s->method->ssl3_enc->generate_master_secret(s, 1225 s-> 1226 session->master_key, 1227 p, n); 1228 /* clean up */ 1229 memset(p, 0, n); 1230 1231 /* send off the data */ 1232 n = BN_num_bytes(dh_clnt->pub_key); 1233 s2n(n, p); 1234 BN_bn2bin(dh_clnt->pub_key, p); 1235 n += 2; 1236 1237 DH_free(dh_clnt); 1238 1239 /* perhaps clean things up a bit EAY EAY EAY EAY */ 1240 } 1241#endif 1242#ifndef OPENSSL_NO_ECDH 1243 else if (alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)) { 1244 const EC_GROUP *srvr_group = NULL; 1245 EC_KEY *tkey; 1246 int ecdh_clnt_cert = 0; 1247 int field_size = 0; 1248 1249 if (s->session->sess_cert == NULL) { 1250 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1251 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1252 SSL_R_UNEXPECTED_MESSAGE); 1253 goto err; 1254 } 1255 1256 /* 1257 * Did we send out the client's ECDH share for use in premaster 1258 * computation as part of client certificate? If so, set 1259 * ecdh_clnt_cert to 1. 1260 */ 1261 if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) { 1262 /* 1263 * XXX: For now, we do not support client authentication 1264 * using ECDH certificates. To add such support, one needs to 1265 * add code that checks for appropriate conditions and sets 1266 * ecdh_clnt_cert to 1. For example, the cert have an ECC key 1267 * on the same curve as the server's and the key should be 1268 * authorized for key agreement. One also needs to add code 1269 * in ssl3_connect to skip sending the certificate verify 1270 * message. if ((s->cert->key->privatekey != NULL) && 1271 * (s->cert->key->privatekey->type == EVP_PKEY_EC) && ...) 1272 * ecdh_clnt_cert = 1; 1273 */ 1274 } 1275 1276 if (s->session->sess_cert->peer_ecdh_tmp != NULL) { 1277 tkey = s->session->sess_cert->peer_ecdh_tmp; 1278 } else { 1279 /* Get the Server Public Key from Cert */ 1280 srvr_pub_pkey = 1281 X509_get_pubkey(s->session-> 1282 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1283 if ((srvr_pub_pkey == NULL) 1284 || (srvr_pub_pkey->type != EVP_PKEY_EC) 1285 || (srvr_pub_pkey->pkey.ec == NULL)) { 1286 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1287 ERR_R_INTERNAL_ERROR); 1288 goto err; 1289 } 1290 1291 tkey = srvr_pub_pkey->pkey.ec; 1292 } 1293 1294 srvr_group = EC_KEY_get0_group(tkey); 1295 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 1296 1297 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) { 1298 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1299 ERR_R_INTERNAL_ERROR); 1300 goto err; 1301 } 1302 1303 if ((clnt_ecdh = EC_KEY_new()) == NULL) { 1304 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1305 ERR_R_MALLOC_FAILURE); 1306 goto err; 1307 } 1308 1309 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) { 1310 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); 1311 goto err; 1312 } 1313 if (ecdh_clnt_cert) { 1314 /* 1315 * Reuse key info from our certificate We only need our 1316 * private key to perform the ECDH computation. 1317 */ 1318 const BIGNUM *priv_key; 1319 tkey = s->cert->key->privatekey->pkey.ec; 1320 priv_key = EC_KEY_get0_private_key(tkey); 1321 if (priv_key == NULL) { 1322 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1323 ERR_R_MALLOC_FAILURE); 1324 goto err; 1325 } 1326 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) { 1327 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1328 ERR_R_EC_LIB); 1329 goto err; 1330 } 1331 } else { 1332 /* Generate a new ECDH key pair */ 1333 if (!(EC_KEY_generate_key(clnt_ecdh))) { 1334 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1335 ERR_R_ECDH_LIB); 1336 goto err; 1337 } 1338 } 1339 1340 /* 1341 * use the 'p' output buffer for the ECDH key, but make sure to 1342 * clear it out afterwards 1343 */ 1344 1345 field_size = EC_GROUP_get_degree(srvr_group); 1346 if (field_size <= 0) { 1347 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1348 goto err; 1349 } 1350 n = ECDH_compute_key(p, (field_size + 7) / 8, srvr_ecpoint, 1351 clnt_ecdh, NULL); 1352 if (n <= 0) { 1353 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1354 goto err; 1355 } 1356 1357 /* generate master key from the result */ 1358 s->session->master_key_length = 1359 s->method->ssl3_enc->generate_master_secret(s, 1360 s-> 1361 session->master_key, 1362 p, n); 1363 1364 memset(p, 0, n); /* clean up */ 1365 1366 if (ecdh_clnt_cert) { 1367 /* Send empty client key exch message */ 1368 n = 0; 1369 } else { 1370 /* 1371 * First check the size of encoding and allocate memory 1372 * accordingly. 1373 */ 1374 encoded_pt_len = 1375 EC_POINT_point2oct(srvr_group, 1376 EC_KEY_get0_public_key(clnt_ecdh), 1377 POINT_CONVERSION_UNCOMPRESSED, 1378 NULL, 0, NULL); 1379 1380 encodedPoint = (unsigned char *) 1381 OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char)); 1382 bn_ctx = BN_CTX_new(); 1383 if ((encodedPoint == NULL) || (bn_ctx == NULL)) { 1384 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1385 ERR_R_MALLOC_FAILURE); 1386 goto err; 1387 } 1388 1389 /* Encode the public key */ 1390 n = EC_POINT_point2oct(srvr_group, 1391 EC_KEY_get0_public_key(clnt_ecdh), 1392 POINT_CONVERSION_UNCOMPRESSED, 1393 encodedPoint, encoded_pt_len, bn_ctx); 1394 1395 *p = n; /* length of encoded point */ 1396 /* Encoded point will be copied here */ 1397 p += 1; 1398 /* copy the point */ 1399 memcpy((unsigned char *)p, encodedPoint, n); 1400 /* increment n to account for length field */ 1401 n += 1; 1402 } 1403 1404 /* Free allocated memory */ 1405 BN_CTX_free(bn_ctx); 1406 if (encodedPoint != NULL) 1407 OPENSSL_free(encodedPoint); 1408 if (clnt_ecdh != NULL) 1409 EC_KEY_free(clnt_ecdh); 1410 EVP_PKEY_free(srvr_pub_pkey); 1411 } 1412#endif /* !OPENSSL_NO_ECDH */ 1413 1414#ifndef OPENSSL_NO_PSK 1415 else if (alg_k & SSL_kPSK) { 1416 char identity[PSK_MAX_IDENTITY_LEN]; 1417 unsigned char *t = NULL; 1418 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN * 2 + 4]; 1419 unsigned int pre_ms_len = 0, psk_len = 0; 1420 int psk_err = 1; 1421 1422 n = 0; 1423 if (s->psk_client_callback == NULL) { 1424 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1425 SSL_R_PSK_NO_CLIENT_CB); 1426 goto err; 1427 } 1428 1429 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint, 1430 identity, PSK_MAX_IDENTITY_LEN, 1431 psk_or_pre_ms, 1432 sizeof(psk_or_pre_ms)); 1433 if (psk_len > PSK_MAX_PSK_LEN) { 1434 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1435 ERR_R_INTERNAL_ERROR); 1436 goto psk_err; 1437 } else if (psk_len == 0) { 1438 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1439 SSL_R_PSK_IDENTITY_NOT_FOUND); 1440 goto psk_err; 1441 } 1442 1443 /* create PSK pre_master_secret */ 1444 pre_ms_len = 2 + psk_len + 2 + psk_len; 1445 t = psk_or_pre_ms; 1446 memmove(psk_or_pre_ms + psk_len + 4, psk_or_pre_ms, psk_len); 1447 s2n(psk_len, t); 1448 memset(t, 0, psk_len); 1449 t += psk_len; 1450 s2n(psk_len, t); 1451 1452 if (s->session->psk_identity_hint != NULL) 1453 OPENSSL_free(s->session->psk_identity_hint); 1454 s->session->psk_identity_hint = 1455 BUF_strdup(s->ctx->psk_identity_hint); 1456 if (s->ctx->psk_identity_hint != NULL 1457 && s->session->psk_identity_hint == NULL) { 1458 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1459 ERR_R_MALLOC_FAILURE); 1460 goto psk_err; 1461 } 1462 1463 if (s->session->psk_identity != NULL) 1464 OPENSSL_free(s->session->psk_identity); 1465 s->session->psk_identity = BUF_strdup(identity); 1466 if (s->session->psk_identity == NULL) { 1467 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1468 ERR_R_MALLOC_FAILURE); 1469 goto psk_err; 1470 } 1471 1472 s->session->master_key_length = 1473 s->method->ssl3_enc->generate_master_secret(s, 1474 s-> 1475 session->master_key, 1476 psk_or_pre_ms, 1477 pre_ms_len); 1478 n = strlen(identity); 1479 s2n(n, p); 1480 memcpy(p, identity, n); 1481 n += 2; 1482 psk_err = 0; 1483 psk_err: 1484 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN); 1485 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1486 if (psk_err != 0) { 1487 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1488 goto err; 1489 } 1490 } 1491#endif 1492 else { 1493 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1494 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1495 ERR_R_INTERNAL_ERROR); 1496 goto err; 1497 } 1498 1499 d = dtls1_set_message_header(s, d, 1500 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); 1501 /*- 1502 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 1503 l2n3(n,d); 1504 l2n(s->d1->handshake_write_seq,d); 1505 s->d1->handshake_write_seq++; 1506 */ 1507 1508 s->state = SSL3_ST_CW_KEY_EXCH_B; 1509 /* number of bytes to write */ 1510 s->init_num = n + DTLS1_HM_HEADER_LENGTH; 1511 s->init_off = 0; 1512 1513 /* buffer the message to handle re-xmits */ 1514 dtls1_buffer_message(s, 0); 1515 } 1516 1517 /* SSL3_ST_CW_KEY_EXCH_B */ 1518 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1519 err: 1520#ifndef OPENSSL_NO_ECDH 1521 BN_CTX_free(bn_ctx); 1522 if (encodedPoint != NULL) 1523 OPENSSL_free(encodedPoint); 1524 if (clnt_ecdh != NULL) 1525 EC_KEY_free(clnt_ecdh); 1526 EVP_PKEY_free(srvr_pub_pkey); 1527#endif 1528 return (-1); 1529} 1530 1531int dtls1_send_client_verify(SSL *s) 1532{ 1533 unsigned char *p, *d; 1534 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; 1535 EVP_PKEY *pkey; 1536#ifndef OPENSSL_NO_RSA 1537 unsigned u = 0; 1538#endif 1539 unsigned long n; 1540#if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA) 1541 int j; 1542#endif 1543 1544 if (s->state == SSL3_ST_CW_CERT_VRFY_A) { 1545 d = (unsigned char *)s->init_buf->data; 1546 p = &(d[DTLS1_HM_HEADER_LENGTH]); 1547 pkey = s->cert->key->privatekey; 1548 1549 s->method->ssl3_enc->cert_verify_mac(s, 1550 NID_sha1, 1551 &(data[MD5_DIGEST_LENGTH])); 1552 1553#ifndef OPENSSL_NO_RSA 1554 if (pkey->type == EVP_PKEY_RSA) { 1555 s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0])); 1556 if (RSA_sign(NID_md5_sha1, data, 1557 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, 1558 &(p[2]), &u, pkey->pkey.rsa) <= 0) { 1559 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB); 1560 goto err; 1561 } 1562 s2n(u, p); 1563 n = u + 2; 1564 } else 1565#endif 1566#ifndef OPENSSL_NO_DSA 1567 if (pkey->type == EVP_PKEY_DSA) { 1568 if (!DSA_sign(pkey->save_type, 1569 &(data[MD5_DIGEST_LENGTH]), 1570 SHA_DIGEST_LENGTH, &(p[2]), 1571 (unsigned int *)&j, pkey->pkey.dsa)) { 1572 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB); 1573 goto err; 1574 } 1575 s2n(j, p); 1576 n = j + 2; 1577 } else 1578#endif 1579#ifndef OPENSSL_NO_ECDSA 1580 if (pkey->type == EVP_PKEY_EC) { 1581 if (!ECDSA_sign(pkey->save_type, 1582 &(data[MD5_DIGEST_LENGTH]), 1583 SHA_DIGEST_LENGTH, &(p[2]), 1584 (unsigned int *)&j, pkey->pkey.ec)) { 1585 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB); 1586 goto err; 1587 } 1588 s2n(j, p); 1589 n = j + 2; 1590 } else 1591#endif 1592 { 1593 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); 1594 goto err; 1595 } 1596 1597 d = dtls1_set_message_header(s, d, 1598 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n); 1599 1600 s->init_num = (int)n + DTLS1_HM_HEADER_LENGTH; 1601 s->init_off = 0; 1602 1603 /* buffer the message to handle re-xmits */ 1604 dtls1_buffer_message(s, 0); 1605 1606 s->state = SSL3_ST_CW_CERT_VRFY_B; 1607 } 1608 1609 /* s->state = SSL3_ST_CW_CERT_VRFY_B */ 1610 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1611 err: 1612 return (-1); 1613} 1614 1615int dtls1_send_client_certificate(SSL *s) 1616{ 1617 X509 *x509 = NULL; 1618 EVP_PKEY *pkey = NULL; 1619 int i; 1620 unsigned long l; 1621 1622 if (s->state == SSL3_ST_CW_CERT_A) { 1623 if ((s->cert == NULL) || 1624 (s->cert->key->x509 == NULL) || 1625 (s->cert->key->privatekey == NULL)) 1626 s->state = SSL3_ST_CW_CERT_B; 1627 else 1628 s->state = SSL3_ST_CW_CERT_C; 1629 } 1630 1631 /* We need to get a client cert */ 1632 if (s->state == SSL3_ST_CW_CERT_B) { 1633 /* 1634 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP; 1635 * return(-1); We then get retied later 1636 */ 1637 i = 0; 1638 i = ssl_do_client_cert_cb(s, &x509, &pkey); 1639 if (i < 0) { 1640 s->rwstate = SSL_X509_LOOKUP; 1641 return (-1); 1642 } 1643 s->rwstate = SSL_NOTHING; 1644 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 1645 s->state = SSL3_ST_CW_CERT_B; 1646 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey)) 1647 i = 0; 1648 } else if (i == 1) { 1649 i = 0; 1650 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE, 1651 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 1652 } 1653 1654 if (x509 != NULL) 1655 X509_free(x509); 1656 if (pkey != NULL) 1657 EVP_PKEY_free(pkey); 1658 if (i == 0) { 1659 if (s->version == SSL3_VERSION) { 1660 s->s3->tmp.cert_req = 0; 1661 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE); 1662 return (1); 1663 } else { 1664 s->s3->tmp.cert_req = 2; 1665 } 1666 } 1667 1668 /* Ok, we have a cert */ 1669 s->state = SSL3_ST_CW_CERT_C; 1670 } 1671 1672 if (s->state == SSL3_ST_CW_CERT_C) { 1673 s->state = SSL3_ST_CW_CERT_D; 1674 l = dtls1_output_cert_chain(s, 1675 (s->s3->tmp.cert_req == 1676 2) ? NULL : s->cert->key->x509); 1677 if (!l) { 1678 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); 1679 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); 1680 return 0; 1681 } 1682 s->init_num = (int)l; 1683 s->init_off = 0; 1684 1685 /* set header called by dtls1_output_cert_chain() */ 1686 1687 /* buffer the message to handle re-xmits */ 1688 dtls1_buffer_message(s, 0); 1689 } 1690 /* SSL3_ST_CW_CERT_D */ 1691 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1692} 1693