d1_clnt.c revision 291721
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 goto end; 755 /* break; */ 756 757 case SSL_ST_ERR: 758 default: 759 SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE); 760 ret = -1; 761 goto end; 762 /* break; */ 763 } 764 765 /* did we do anything */ 766 if (!s->s3->tmp.reuse_message && !skip) { 767 if (s->debug) { 768 if ((ret = BIO_flush(s->wbio)) <= 0) 769 goto end; 770 } 771 772 if ((cb != NULL) && (s->state != state)) { 773 new_state = s->state; 774 s->state = state; 775 cb(s, SSL_CB_CONNECT_LOOP, 1); 776 s->state = new_state; 777 } 778 } 779 skip = 0; 780 } 781 end: 782 s->in_handshake--; 783 784#ifndef OPENSSL_NO_SCTP 785 /* 786 * Notify SCTP BIO socket to leave handshake mode and allow stream 787 * identifier other than 0. Will be ignored if no SCTP is used. 788 */ 789 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 790 s->in_handshake, NULL); 791#endif 792 793 if (buf != NULL) 794 BUF_MEM_free(buf); 795 if (cb != NULL) 796 cb(s, SSL_CB_CONNECT_EXIT, ret); 797 return (ret); 798} 799 800int dtls1_client_hello(SSL *s) 801{ 802 unsigned char *buf; 803 unsigned char *p, *d; 804 unsigned int i, j; 805 unsigned long l; 806 SSL_COMP *comp; 807 808 buf = (unsigned char *)s->init_buf->data; 809 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) { 810 SSL_SESSION *sess = s->session; 811 if ((s->session == NULL) || (s->session->ssl_version != s->version) || 812#ifdef OPENSSL_NO_TLSEXT 813 !sess->session_id_length || 814#else 815 (!sess->session_id_length && !sess->tlsext_tick) || 816#endif 817 (s->session->not_resumable)) { 818 if (!ssl_get_new_session(s, 0)) 819 goto err; 820 } 821 /* else use the pre-loaded session */ 822 823 p = s->s3->client_random; 824 825 /* 826 * if client_random is initialized, reuse it, we are required to use 827 * same upon reply to HelloVerify 828 */ 829 for (i = 0; p[i] == '\0' && i < sizeof(s->s3->client_random); i++) ; 830 if (i == sizeof(s->s3->client_random)) 831 ssl_fill_hello_random(s, 0, p, sizeof(s->s3->client_random)); 832 833 /* Do the message type and length last */ 834 d = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 835 836 *(p++) = s->version >> 8; 837 *(p++) = s->version & 0xff; 838 s->client_version = s->version; 839 840 /* Random stuff */ 841 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 842 p += SSL3_RANDOM_SIZE; 843 844 /* Session ID */ 845 if (s->new_session) 846 i = 0; 847 else 848 i = s->session->session_id_length; 849 *(p++) = i; 850 if (i != 0) { 851 if (i > sizeof s->session->session_id) { 852 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 853 goto err; 854 } 855 memcpy(p, s->session->session_id, i); 856 p += i; 857 } 858 859 /* cookie stuff */ 860 if (s->d1->cookie_len > sizeof(s->d1->cookie)) { 861 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 862 goto err; 863 } 864 *(p++) = s->d1->cookie_len; 865 memcpy(p, s->d1->cookie, s->d1->cookie_len); 866 p += s->d1->cookie_len; 867 868 /* Ciphers supported */ 869 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0); 870 if (i == 0) { 871 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); 872 goto err; 873 } 874 s2n(i, p); 875 p += i; 876 877 /* COMPRESSION */ 878 if (s->ctx->comp_methods == NULL) 879 j = 0; 880 else 881 j = sk_SSL_COMP_num(s->ctx->comp_methods); 882 *(p++) = 1 + j; 883 for (i = 0; i < j; i++) { 884 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i); 885 *(p++) = comp->id; 886 } 887 *(p++) = 0; /* Add the NULL method */ 888 889#ifndef OPENSSL_NO_TLSEXT 890 /* TLS extensions */ 891 if (ssl_prepare_clienthello_tlsext(s) <= 0) { 892 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); 893 goto err; 894 } 895 if ((p = 896 ssl_add_clienthello_tlsext(s, p, 897 buf + SSL3_RT_MAX_PLAIN_LENGTH)) == 898 NULL) { 899 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 900 goto err; 901 } 902#endif 903 904 l = (p - d); 905 d = buf; 906 907 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l); 908 909 s->state = SSL3_ST_CW_CLNT_HELLO_B; 910 /* number of bytes to write */ 911 s->init_num = p - buf; 912 s->init_off = 0; 913 914 /* buffer the message to handle re-xmits */ 915 dtls1_buffer_message(s, 0); 916 } 917 918 /* SSL3_ST_CW_CLNT_HELLO_B */ 919 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 920 err: 921 return (-1); 922} 923 924static int dtls1_get_hello_verify(SSL *s) 925{ 926 int n, al, ok = 0; 927 unsigned char *data; 928 unsigned int cookie_len; 929 930 n = s->method->ssl_get_message(s, 931 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 932 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 933 -1, s->max_cert_list, &ok); 934 935 if (!ok) 936 return ((int)n); 937 938 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 939 s->d1->send_cookie = 0; 940 s->s3->tmp.reuse_message = 1; 941 return (1); 942 } 943 944 data = (unsigned char *)s->init_msg; 945 946 if ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))) { 947 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION); 948 s->version = (s->version & 0xff00) | data[1]; 949 al = SSL_AD_PROTOCOL_VERSION; 950 goto f_err; 951 } 952 data += 2; 953 954 cookie_len = *(data++); 955 if (cookie_len > sizeof(s->d1->cookie)) { 956 al = SSL_AD_ILLEGAL_PARAMETER; 957 goto f_err; 958 } 959 960 memcpy(s->d1->cookie, data, cookie_len); 961 s->d1->cookie_len = cookie_len; 962 963 s->d1->send_cookie = 1; 964 return 1; 965 966 f_err: 967 ssl3_send_alert(s, SSL3_AL_FATAL, al); 968 s->state = SSL_ST_ERR; 969 return -1; 970} 971 972int dtls1_send_client_key_exchange(SSL *s) 973{ 974 unsigned char *p, *d; 975 int n; 976 unsigned long alg_k; 977#ifndef OPENSSL_NO_RSA 978 unsigned char *q; 979 EVP_PKEY *pkey = NULL; 980#endif 981#ifndef OPENSSL_NO_KRB5 982 KSSL_ERR kssl_err; 983#endif /* OPENSSL_NO_KRB5 */ 984#ifndef OPENSSL_NO_ECDH 985 EC_KEY *clnt_ecdh = NULL; 986 const EC_POINT *srvr_ecpoint = NULL; 987 EVP_PKEY *srvr_pub_pkey = NULL; 988 unsigned char *encodedPoint = NULL; 989 int encoded_pt_len = 0; 990 BN_CTX *bn_ctx = NULL; 991#endif 992 993 if (s->state == SSL3_ST_CW_KEY_EXCH_A) { 994 d = (unsigned char *)s->init_buf->data; 995 p = &(d[DTLS1_HM_HEADER_LENGTH]); 996 997 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 998 999 /* Fool emacs indentation */ 1000 if (0) { 1001 } 1002#ifndef OPENSSL_NO_RSA 1003 else if (alg_k & SSL_kRSA) { 1004 RSA *rsa; 1005 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 1006 1007 if (s->session->sess_cert == NULL) { 1008 /* 1009 * We should always have a server certificate with SSL_kRSA. 1010 */ 1011 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1012 ERR_R_INTERNAL_ERROR); 1013 goto err; 1014 } 1015 1016 if (s->session->sess_cert->peer_rsa_tmp != NULL) 1017 rsa = s->session->sess_cert->peer_rsa_tmp; 1018 else { 1019 pkey = 1020 X509_get_pubkey(s->session-> 1021 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC]. 1022 x509); 1023 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) 1024 || (pkey->pkey.rsa == NULL)) { 1025 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1026 ERR_R_INTERNAL_ERROR); 1027 goto err; 1028 } 1029 rsa = pkey->pkey.rsa; 1030 EVP_PKEY_free(pkey); 1031 } 1032 1033 tmp_buf[0] = s->client_version >> 8; 1034 tmp_buf[1] = s->client_version & 0xff; 1035 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0) 1036 goto err; 1037 1038 s->session->master_key_length = sizeof tmp_buf; 1039 1040 q = p; 1041 /* Fix buf for TLS and [incidentally] DTLS */ 1042 if (s->version > SSL3_VERSION) 1043 p += 2; 1044 n = RSA_public_encrypt(sizeof tmp_buf, 1045 tmp_buf, p, rsa, RSA_PKCS1_PADDING); 1046# ifdef PKCS1_CHECK 1047 if (s->options & SSL_OP_PKCS1_CHECK_1) 1048 p[1]++; 1049 if (s->options & SSL_OP_PKCS1_CHECK_2) 1050 tmp_buf[0] = 0x70; 1051# endif 1052 if (n <= 0) { 1053 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1054 SSL_R_BAD_RSA_ENCRYPT); 1055 goto err; 1056 } 1057 1058 /* Fix buf for TLS and [incidentally] DTLS */ 1059 if (s->version > SSL3_VERSION) { 1060 s2n(n, q); 1061 n += 2; 1062 } 1063 1064 s->session->master_key_length = 1065 s->method->ssl3_enc->generate_master_secret(s, 1066 s-> 1067 session->master_key, 1068 tmp_buf, 1069 sizeof tmp_buf); 1070 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 1071 } 1072#endif 1073#ifndef OPENSSL_NO_KRB5 1074 else if (alg_k & SSL_kKRB5) { 1075 krb5_error_code krb5rc; 1076 KSSL_CTX *kssl_ctx = s->kssl_ctx; 1077 /* krb5_data krb5_ap_req; */ 1078 krb5_data *enc_ticket; 1079 krb5_data authenticator, *authp = NULL; 1080 EVP_CIPHER_CTX ciph_ctx; 1081 const EVP_CIPHER *enc = NULL; 1082 unsigned char iv[EVP_MAX_IV_LENGTH]; 1083 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 1084 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH]; 1085 int padl, outl = sizeof(epms); 1086 1087 EVP_CIPHER_CTX_init(&ciph_ctx); 1088 1089# ifdef KSSL_DEBUG 1090 printf("ssl3_send_client_key_exchange(%lx & %lx)\n", 1091 alg_k, SSL_kKRB5); 1092# endif /* KSSL_DEBUG */ 1093 1094 authp = NULL; 1095# ifdef KRB5SENDAUTH 1096 if (KRB5SENDAUTH) 1097 authp = &authenticator; 1098# endif /* KRB5SENDAUTH */ 1099 1100 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err); 1101 enc = kssl_map_enc(kssl_ctx->enctype); 1102 if (enc == NULL) 1103 goto err; 1104# ifdef KSSL_DEBUG 1105 { 1106 printf("kssl_cget_tkt rtn %d\n", krb5rc); 1107 if (krb5rc && kssl_err.text) 1108 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 1109 } 1110# endif /* KSSL_DEBUG */ 1111 1112 if (krb5rc) { 1113 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1114 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason); 1115 goto err; 1116 } 1117 1118 /*- 1119 * 20010406 VRS - Earlier versions used KRB5 AP_REQ 1120 ** in place of RFC 2712 KerberosWrapper, as in: 1121 ** 1122 ** Send ticket (copy to *p, set n = length) 1123 ** n = krb5_ap_req.length; 1124 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 1125 ** if (krb5_ap_req.data) 1126 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 1127 ** 1128 ** Now using real RFC 2712 KerberosWrapper 1129 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) 1130 ** Note: 2712 "opaque" types are here replaced 1131 ** with a 2-byte length followed by the value. 1132 ** Example: 1133 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 1134 ** Where "xx xx" = length bytes. Shown here with 1135 ** optional authenticator omitted. 1136 */ 1137 1138 /* KerberosWrapper.Ticket */ 1139 s2n(enc_ticket->length, p); 1140 memcpy(p, enc_ticket->data, enc_ticket->length); 1141 p += enc_ticket->length; 1142 n = enc_ticket->length + 2; 1143 1144 /* KerberosWrapper.Authenticator */ 1145 if (authp && authp->length) { 1146 s2n(authp->length, p); 1147 memcpy(p, authp->data, authp->length); 1148 p += authp->length; 1149 n += authp->length + 2; 1150 1151 free(authp->data); 1152 authp->data = NULL; 1153 authp->length = 0; 1154 } else { 1155 s2n(0, p); /* null authenticator length */ 1156 n += 2; 1157 } 1158 1159 if (RAND_bytes(tmp_buf, sizeof tmp_buf) <= 0) 1160 goto err; 1161 1162 /*- 1163 * 20010420 VRS. Tried it this way; failed. 1164 * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 1165 * EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 1166 * kssl_ctx->length); 1167 * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 1168 */ 1169 1170 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 1171 EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv); 1172 EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf, 1173 sizeof tmp_buf); 1174 EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl); 1175 outl += padl; 1176 if (outl > (int)sizeof epms) { 1177 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1178 ERR_R_INTERNAL_ERROR); 1179 goto err; 1180 } 1181 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 1182 1183 /* KerberosWrapper.EncryptedPreMasterSecret */ 1184 s2n(outl, p); 1185 memcpy(p, epms, outl); 1186 p += outl; 1187 n += outl + 2; 1188 1189 s->session->master_key_length = 1190 s->method->ssl3_enc->generate_master_secret(s, 1191 s-> 1192 session->master_key, 1193 tmp_buf, 1194 sizeof tmp_buf); 1195 1196 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 1197 OPENSSL_cleanse(epms, outl); 1198 } 1199#endif 1200#ifndef OPENSSL_NO_DH 1201 else if (alg_k & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) { 1202 DH *dh_srvr, *dh_clnt; 1203 1204 if (s->session->sess_cert == NULL) { 1205 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1206 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1207 SSL_R_UNEXPECTED_MESSAGE); 1208 goto err; 1209 } 1210 1211 if (s->session->sess_cert->peer_dh_tmp != NULL) 1212 dh_srvr = s->session->sess_cert->peer_dh_tmp; 1213 else { 1214 /* we get them from the cert */ 1215 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1216 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1217 SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1218 goto err; 1219 } 1220 1221 /* generate a new random key */ 1222 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 1223 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 1224 goto err; 1225 } 1226 if (!DH_generate_key(dh_clnt)) { 1227 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 1228 goto err; 1229 } 1230 1231 /* 1232 * use the 'p' output buffer for the DH key, but make sure to 1233 * clear it out afterwards 1234 */ 1235 1236 n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt); 1237 1238 if (n <= 0) { 1239 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 1240 goto err; 1241 } 1242 1243 /* generate master key from the result */ 1244 s->session->master_key_length = 1245 s->method->ssl3_enc->generate_master_secret(s, 1246 s-> 1247 session->master_key, 1248 p, n); 1249 /* clean up */ 1250 memset(p, 0, n); 1251 1252 /* send off the data */ 1253 n = BN_num_bytes(dh_clnt->pub_key); 1254 s2n(n, p); 1255 BN_bn2bin(dh_clnt->pub_key, p); 1256 n += 2; 1257 1258 DH_free(dh_clnt); 1259 1260 /* perhaps clean things up a bit EAY EAY EAY EAY */ 1261 } 1262#endif 1263#ifndef OPENSSL_NO_ECDH 1264 else if (alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)) { 1265 const EC_GROUP *srvr_group = NULL; 1266 EC_KEY *tkey; 1267 int ecdh_clnt_cert = 0; 1268 int field_size = 0; 1269 1270 if (s->session->sess_cert == NULL) { 1271 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1272 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1273 SSL_R_UNEXPECTED_MESSAGE); 1274 goto err; 1275 } 1276 1277 /* 1278 * Did we send out the client's ECDH share for use in premaster 1279 * computation as part of client certificate? If so, set 1280 * ecdh_clnt_cert to 1. 1281 */ 1282 if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) { 1283 /* 1284 * XXX: For now, we do not support client authentication 1285 * using ECDH certificates. To add such support, one needs to 1286 * add code that checks for appropriate conditions and sets 1287 * ecdh_clnt_cert to 1. For example, the cert have an ECC key 1288 * on the same curve as the server's and the key should be 1289 * authorized for key agreement. One also needs to add code 1290 * in ssl3_connect to skip sending the certificate verify 1291 * message. if ((s->cert->key->privatekey != NULL) && 1292 * (s->cert->key->privatekey->type == EVP_PKEY_EC) && ...) 1293 * ecdh_clnt_cert = 1; 1294 */ 1295 } 1296 1297 if (s->session->sess_cert->peer_ecdh_tmp != NULL) { 1298 tkey = s->session->sess_cert->peer_ecdh_tmp; 1299 } else { 1300 /* Get the Server Public Key from Cert */ 1301 srvr_pub_pkey = 1302 X509_get_pubkey(s->session-> 1303 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1304 if ((srvr_pub_pkey == NULL) 1305 || (srvr_pub_pkey->type != EVP_PKEY_EC) 1306 || (srvr_pub_pkey->pkey.ec == NULL)) { 1307 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1308 ERR_R_INTERNAL_ERROR); 1309 goto err; 1310 } 1311 1312 tkey = srvr_pub_pkey->pkey.ec; 1313 } 1314 1315 srvr_group = EC_KEY_get0_group(tkey); 1316 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 1317 1318 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) { 1319 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1320 ERR_R_INTERNAL_ERROR); 1321 goto err; 1322 } 1323 1324 if ((clnt_ecdh = EC_KEY_new()) == NULL) { 1325 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1326 ERR_R_MALLOC_FAILURE); 1327 goto err; 1328 } 1329 1330 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) { 1331 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); 1332 goto err; 1333 } 1334 if (ecdh_clnt_cert) { 1335 /* 1336 * Reuse key info from our certificate We only need our 1337 * private key to perform the ECDH computation. 1338 */ 1339 const BIGNUM *priv_key; 1340 tkey = s->cert->key->privatekey->pkey.ec; 1341 priv_key = EC_KEY_get0_private_key(tkey); 1342 if (priv_key == NULL) { 1343 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1344 ERR_R_MALLOC_FAILURE); 1345 goto err; 1346 } 1347 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) { 1348 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1349 ERR_R_EC_LIB); 1350 goto err; 1351 } 1352 } else { 1353 /* Generate a new ECDH key pair */ 1354 if (!(EC_KEY_generate_key(clnt_ecdh))) { 1355 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1356 ERR_R_ECDH_LIB); 1357 goto err; 1358 } 1359 } 1360 1361 /* 1362 * use the 'p' output buffer for the ECDH key, but make sure to 1363 * clear it out afterwards 1364 */ 1365 1366 field_size = EC_GROUP_get_degree(srvr_group); 1367 if (field_size <= 0) { 1368 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1369 goto err; 1370 } 1371 n = ECDH_compute_key(p, (field_size + 7) / 8, srvr_ecpoint, 1372 clnt_ecdh, NULL); 1373 if (n <= 0) { 1374 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1375 goto err; 1376 } 1377 1378 /* generate master key from the result */ 1379 s->session->master_key_length = 1380 s->method->ssl3_enc->generate_master_secret(s, 1381 s-> 1382 session->master_key, 1383 p, n); 1384 1385 memset(p, 0, n); /* clean up */ 1386 1387 if (ecdh_clnt_cert) { 1388 /* Send empty client key exch message */ 1389 n = 0; 1390 } else { 1391 /* 1392 * First check the size of encoding and allocate memory 1393 * accordingly. 1394 */ 1395 encoded_pt_len = 1396 EC_POINT_point2oct(srvr_group, 1397 EC_KEY_get0_public_key(clnt_ecdh), 1398 POINT_CONVERSION_UNCOMPRESSED, 1399 NULL, 0, NULL); 1400 1401 encodedPoint = (unsigned char *) 1402 OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char)); 1403 bn_ctx = BN_CTX_new(); 1404 if ((encodedPoint == NULL) || (bn_ctx == NULL)) { 1405 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1406 ERR_R_MALLOC_FAILURE); 1407 goto err; 1408 } 1409 1410 /* Encode the public key */ 1411 n = EC_POINT_point2oct(srvr_group, 1412 EC_KEY_get0_public_key(clnt_ecdh), 1413 POINT_CONVERSION_UNCOMPRESSED, 1414 encodedPoint, encoded_pt_len, bn_ctx); 1415 1416 *p = n; /* length of encoded point */ 1417 /* Encoded point will be copied here */ 1418 p += 1; 1419 /* copy the point */ 1420 memcpy((unsigned char *)p, encodedPoint, n); 1421 /* increment n to account for length field */ 1422 n += 1; 1423 } 1424 1425 /* Free allocated memory */ 1426 BN_CTX_free(bn_ctx); 1427 if (encodedPoint != NULL) 1428 OPENSSL_free(encodedPoint); 1429 if (clnt_ecdh != NULL) 1430 EC_KEY_free(clnt_ecdh); 1431 EVP_PKEY_free(srvr_pub_pkey); 1432 } 1433#endif /* !OPENSSL_NO_ECDH */ 1434 1435#ifndef OPENSSL_NO_PSK 1436 else if (alg_k & SSL_kPSK) { 1437 char identity[PSK_MAX_IDENTITY_LEN]; 1438 unsigned char *t = NULL; 1439 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN * 2 + 4]; 1440 unsigned int pre_ms_len = 0, psk_len = 0; 1441 int psk_err = 1; 1442 1443 n = 0; 1444 if (s->psk_client_callback == NULL) { 1445 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1446 SSL_R_PSK_NO_CLIENT_CB); 1447 goto err; 1448 } 1449 1450 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint, 1451 identity, PSK_MAX_IDENTITY_LEN, 1452 psk_or_pre_ms, 1453 sizeof(psk_or_pre_ms)); 1454 if (psk_len > PSK_MAX_PSK_LEN) { 1455 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1456 ERR_R_INTERNAL_ERROR); 1457 goto psk_err; 1458 } else if (psk_len == 0) { 1459 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1460 SSL_R_PSK_IDENTITY_NOT_FOUND); 1461 goto psk_err; 1462 } 1463 1464 /* create PSK pre_master_secret */ 1465 pre_ms_len = 2 + psk_len + 2 + psk_len; 1466 t = psk_or_pre_ms; 1467 memmove(psk_or_pre_ms + psk_len + 4, psk_or_pre_ms, psk_len); 1468 s2n(psk_len, t); 1469 memset(t, 0, psk_len); 1470 t += psk_len; 1471 s2n(psk_len, t); 1472 1473 if (s->session->psk_identity_hint != NULL) 1474 OPENSSL_free(s->session->psk_identity_hint); 1475 s->session->psk_identity_hint = 1476 BUF_strdup(s->ctx->psk_identity_hint); 1477 if (s->ctx->psk_identity_hint != NULL 1478 && s->session->psk_identity_hint == NULL) { 1479 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1480 ERR_R_MALLOC_FAILURE); 1481 goto psk_err; 1482 } 1483 1484 if (s->session->psk_identity != NULL) 1485 OPENSSL_free(s->session->psk_identity); 1486 s->session->psk_identity = BUF_strdup(identity); 1487 if (s->session->psk_identity == NULL) { 1488 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1489 ERR_R_MALLOC_FAILURE); 1490 goto psk_err; 1491 } 1492 1493 s->session->master_key_length = 1494 s->method->ssl3_enc->generate_master_secret(s, 1495 s-> 1496 session->master_key, 1497 psk_or_pre_ms, 1498 pre_ms_len); 1499 n = strlen(identity); 1500 s2n(n, p); 1501 memcpy(p, identity, n); 1502 n += 2; 1503 psk_err = 0; 1504 psk_err: 1505 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN); 1506 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1507 if (psk_err != 0) { 1508 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1509 goto err; 1510 } 1511 } 1512#endif 1513 else { 1514 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1515 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1516 ERR_R_INTERNAL_ERROR); 1517 goto err; 1518 } 1519 1520 d = dtls1_set_message_header(s, d, 1521 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); 1522 /*- 1523 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 1524 l2n3(n,d); 1525 l2n(s->d1->handshake_write_seq,d); 1526 s->d1->handshake_write_seq++; 1527 */ 1528 1529 s->state = SSL3_ST_CW_KEY_EXCH_B; 1530 /* number of bytes to write */ 1531 s->init_num = n + DTLS1_HM_HEADER_LENGTH; 1532 s->init_off = 0; 1533 1534 /* buffer the message to handle re-xmits */ 1535 dtls1_buffer_message(s, 0); 1536 } 1537 1538 /* SSL3_ST_CW_KEY_EXCH_B */ 1539 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1540 err: 1541#ifndef OPENSSL_NO_ECDH 1542 BN_CTX_free(bn_ctx); 1543 if (encodedPoint != NULL) 1544 OPENSSL_free(encodedPoint); 1545 if (clnt_ecdh != NULL) 1546 EC_KEY_free(clnt_ecdh); 1547 EVP_PKEY_free(srvr_pub_pkey); 1548#endif 1549 return (-1); 1550} 1551 1552int dtls1_send_client_verify(SSL *s) 1553{ 1554 unsigned char *p, *d; 1555 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; 1556 EVP_PKEY *pkey; 1557#ifndef OPENSSL_NO_RSA 1558 unsigned u = 0; 1559#endif 1560 unsigned long n; 1561#if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA) 1562 int j; 1563#endif 1564 1565 if (s->state == SSL3_ST_CW_CERT_VRFY_A) { 1566 d = (unsigned char *)s->init_buf->data; 1567 p = &(d[DTLS1_HM_HEADER_LENGTH]); 1568 pkey = s->cert->key->privatekey; 1569 1570 s->method->ssl3_enc->cert_verify_mac(s, 1571 NID_sha1, 1572 &(data[MD5_DIGEST_LENGTH])); 1573 1574#ifndef OPENSSL_NO_RSA 1575 if (pkey->type == EVP_PKEY_RSA) { 1576 s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0])); 1577 if (RSA_sign(NID_md5_sha1, data, 1578 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, 1579 &(p[2]), &u, pkey->pkey.rsa) <= 0) { 1580 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB); 1581 goto err; 1582 } 1583 s2n(u, p); 1584 n = u + 2; 1585 } else 1586#endif 1587#ifndef OPENSSL_NO_DSA 1588 if (pkey->type == EVP_PKEY_DSA) { 1589 if (!DSA_sign(pkey->save_type, 1590 &(data[MD5_DIGEST_LENGTH]), 1591 SHA_DIGEST_LENGTH, &(p[2]), 1592 (unsigned int *)&j, pkey->pkey.dsa)) { 1593 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB); 1594 goto err; 1595 } 1596 s2n(j, p); 1597 n = j + 2; 1598 } else 1599#endif 1600#ifndef OPENSSL_NO_ECDSA 1601 if (pkey->type == EVP_PKEY_EC) { 1602 if (!ECDSA_sign(pkey->save_type, 1603 &(data[MD5_DIGEST_LENGTH]), 1604 SHA_DIGEST_LENGTH, &(p[2]), 1605 (unsigned int *)&j, pkey->pkey.ec)) { 1606 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB); 1607 goto err; 1608 } 1609 s2n(j, p); 1610 n = j + 2; 1611 } else 1612#endif 1613 { 1614 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); 1615 goto err; 1616 } 1617 1618 d = dtls1_set_message_header(s, d, 1619 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n); 1620 1621 s->init_num = (int)n + DTLS1_HM_HEADER_LENGTH; 1622 s->init_off = 0; 1623 1624 /* buffer the message to handle re-xmits */ 1625 dtls1_buffer_message(s, 0); 1626 1627 s->state = SSL3_ST_CW_CERT_VRFY_B; 1628 } 1629 1630 /* s->state = SSL3_ST_CW_CERT_VRFY_B */ 1631 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1632 err: 1633 return (-1); 1634} 1635 1636int dtls1_send_client_certificate(SSL *s) 1637{ 1638 X509 *x509 = NULL; 1639 EVP_PKEY *pkey = NULL; 1640 int i; 1641 unsigned long l; 1642 1643 if (s->state == SSL3_ST_CW_CERT_A) { 1644 if ((s->cert == NULL) || 1645 (s->cert->key->x509 == NULL) || 1646 (s->cert->key->privatekey == NULL)) 1647 s->state = SSL3_ST_CW_CERT_B; 1648 else 1649 s->state = SSL3_ST_CW_CERT_C; 1650 } 1651 1652 /* We need to get a client cert */ 1653 if (s->state == SSL3_ST_CW_CERT_B) { 1654 /* 1655 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP; 1656 * return(-1); We then get retied later 1657 */ 1658 i = 0; 1659 i = ssl_do_client_cert_cb(s, &x509, &pkey); 1660 if (i < 0) { 1661 s->rwstate = SSL_X509_LOOKUP; 1662 return (-1); 1663 } 1664 s->rwstate = SSL_NOTHING; 1665 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 1666 s->state = SSL3_ST_CW_CERT_B; 1667 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey)) 1668 i = 0; 1669 } else if (i == 1) { 1670 i = 0; 1671 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE, 1672 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 1673 } 1674 1675 if (x509 != NULL) 1676 X509_free(x509); 1677 if (pkey != NULL) 1678 EVP_PKEY_free(pkey); 1679 if (i == 0) { 1680 if (s->version == SSL3_VERSION) { 1681 s->s3->tmp.cert_req = 0; 1682 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE); 1683 return (1); 1684 } else { 1685 s->s3->tmp.cert_req = 2; 1686 } 1687 } 1688 1689 /* Ok, we have a cert */ 1690 s->state = SSL3_ST_CW_CERT_C; 1691 } 1692 1693 if (s->state == SSL3_ST_CW_CERT_C) { 1694 s->state = SSL3_ST_CW_CERT_D; 1695 l = dtls1_output_cert_chain(s, 1696 (s->s3->tmp.cert_req == 1697 2) ? NULL : s->cert->key->x509); 1698 if (!l) { 1699 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); 1700 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); 1701 return 0; 1702 } 1703 s->init_num = (int)l; 1704 s->init_off = 0; 1705 1706 /* set header called by dtls1_output_cert_chain() */ 1707 1708 /* buffer the message to handle re-xmits */ 1709 dtls1_buffer_message(s, 0); 1710 } 1711 /* SSL3_ST_CW_CERT_D */ 1712 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1713} 1714