d1_clnt.c revision 306230
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 case SSL3_ST_CW_CLNT_HELLO_B: 303 304 s->shutdown = 0; 305 306 /* every DTLS ClientHello resets Finished MAC */ 307 ssl3_init_finished_mac(s); 308 309 dtls1_start_timer(s); 310 ret = dtls1_client_hello(s); 311 if (ret <= 0) 312 goto end; 313 314 if (s->d1->send_cookie) { 315 s->state = SSL3_ST_CW_FLUSH; 316 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A; 317 } else 318 s->state = SSL3_ST_CR_SRVR_HELLO_A; 319 320 s->init_num = 0; 321 322#ifndef OPENSSL_NO_SCTP 323 /* Disable buffering for SCTP */ 324 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) { 325#endif 326 /* 327 * turn on buffering for the next lot of output 328 */ 329 if (s->bbio != s->wbio) 330 s->wbio = BIO_push(s->bbio, s->wbio); 331#ifndef OPENSSL_NO_SCTP 332 } 333#endif 334 335 break; 336 337 case SSL3_ST_CR_SRVR_HELLO_A: 338 case SSL3_ST_CR_SRVR_HELLO_B: 339 ret = ssl3_get_server_hello(s); 340 if (ret <= 0) 341 goto end; 342 else { 343 if (s->hit) { 344#ifndef OPENSSL_NO_SCTP 345 /* 346 * Add new shared key for SCTP-Auth, will be ignored if 347 * no SCTP used. 348 */ 349 snprintf((char *)labelbuffer, 350 sizeof(DTLS1_SCTP_AUTH_LABEL), 351 DTLS1_SCTP_AUTH_LABEL); 352 353 SSL_export_keying_material(s, sctpauthkey, 354 sizeof(sctpauthkey), 355 labelbuffer, 356 sizeof(labelbuffer), NULL, 0, 357 0); 358 359 BIO_ctrl(SSL_get_wbio(s), 360 BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 361 sizeof(sctpauthkey), sctpauthkey); 362#endif 363 364 s->state = SSL3_ST_CR_FINISHED_A; 365 } else 366 s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 367 } 368 s->init_num = 0; 369 break; 370 371 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 372 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 373 374 ret = dtls1_get_hello_verify(s); 375 if (ret <= 0) 376 goto end; 377 dtls1_stop_timer(s); 378 if (s->d1->send_cookie) /* start again, with a cookie */ 379 s->state = SSL3_ST_CW_CLNT_HELLO_A; 380 else 381 s->state = SSL3_ST_CR_CERT_A; 382 s->init_num = 0; 383 break; 384 385 case SSL3_ST_CR_CERT_A: 386 case SSL3_ST_CR_CERT_B: 387 /* Check if it is anon DH or PSK */ 388 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 389 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 390 ret = ssl3_get_server_certificate(s); 391 if (ret <= 0) 392 goto end; 393#ifndef OPENSSL_NO_TLSEXT 394 if (s->tlsext_status_expected) 395 s->state = SSL3_ST_CR_CERT_STATUS_A; 396 else 397 s->state = SSL3_ST_CR_KEY_EXCH_A; 398 } else { 399 skip = 1; 400 s->state = SSL3_ST_CR_KEY_EXCH_A; 401 } 402#else 403 } else 404 skip = 1; 405 406 s->state = SSL3_ST_CR_KEY_EXCH_A; 407#endif 408 s->init_num = 0; 409 break; 410 411 case SSL3_ST_CR_KEY_EXCH_A: 412 case SSL3_ST_CR_KEY_EXCH_B: 413 ret = ssl3_get_key_exchange(s); 414 if (ret <= 0) 415 goto end; 416 s->state = SSL3_ST_CR_CERT_REQ_A; 417 s->init_num = 0; 418 419 /* 420 * at this point we check that we have the required stuff from 421 * the server 422 */ 423 if (!ssl3_check_cert_and_algorithm(s)) { 424 ret = -1; 425 s->state = SSL_ST_ERR; 426 goto end; 427 } 428 break; 429 430 case SSL3_ST_CR_CERT_REQ_A: 431 case SSL3_ST_CR_CERT_REQ_B: 432 ret = ssl3_get_certificate_request(s); 433 if (ret <= 0) 434 goto end; 435 s->state = SSL3_ST_CR_SRVR_DONE_A; 436 s->init_num = 0; 437 break; 438 439 case SSL3_ST_CR_SRVR_DONE_A: 440 case SSL3_ST_CR_SRVR_DONE_B: 441 ret = ssl3_get_server_done(s); 442 if (ret <= 0) 443 goto end; 444 dtls1_stop_timer(s); 445 if (s->s3->tmp.cert_req) 446 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A; 447 else 448 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A; 449 s->init_num = 0; 450 451#ifndef OPENSSL_NO_SCTP 452 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 453 state == SSL_ST_RENEGOTIATE) 454 s->state = DTLS1_SCTP_ST_CR_READ_SOCK; 455 else 456#endif 457 s->state = s->s3->tmp.next_state; 458 break; 459 460 case SSL3_ST_CW_CERT_A: 461 case SSL3_ST_CW_CERT_B: 462 case SSL3_ST_CW_CERT_C: 463 case SSL3_ST_CW_CERT_D: 464 dtls1_start_timer(s); 465 ret = dtls1_send_client_certificate(s); 466 if (ret <= 0) 467 goto end; 468 s->state = SSL3_ST_CW_KEY_EXCH_A; 469 s->init_num = 0; 470 break; 471 472 case SSL3_ST_CW_KEY_EXCH_A: 473 case SSL3_ST_CW_KEY_EXCH_B: 474 dtls1_start_timer(s); 475 ret = dtls1_send_client_key_exchange(s); 476 if (ret <= 0) 477 goto end; 478 479#ifndef OPENSSL_NO_SCTP 480 /* 481 * Add new shared key for SCTP-Auth, will be ignored if no SCTP 482 * used. 483 */ 484 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 485 DTLS1_SCTP_AUTH_LABEL); 486 487 SSL_export_keying_material(s, sctpauthkey, 488 sizeof(sctpauthkey), labelbuffer, 489 sizeof(labelbuffer), NULL, 0, 0); 490 491 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 492 sizeof(sctpauthkey), sctpauthkey); 493#endif 494 495 /* 496 * EAY EAY EAY need to check for DH fix cert sent back 497 */ 498 /* 499 * For TLS, cert_req is set to 2, so a cert chain of nothing is 500 * sent, but no verify packet is sent 501 */ 502 if (s->s3->tmp.cert_req == 1) { 503 s->state = SSL3_ST_CW_CERT_VRFY_A; 504 } else { 505#ifndef OPENSSL_NO_SCTP 506 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 507 s->d1->next_state = SSL3_ST_CW_CHANGE_A; 508 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 509 } else 510#endif 511 s->state = SSL3_ST_CW_CHANGE_A; 512 } 513 514 s->init_num = 0; 515 break; 516 517 case SSL3_ST_CW_CERT_VRFY_A: 518 case SSL3_ST_CW_CERT_VRFY_B: 519 dtls1_start_timer(s); 520 ret = dtls1_send_client_verify(s); 521 if (ret <= 0) 522 goto end; 523#ifndef OPENSSL_NO_SCTP 524 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 525 s->d1->next_state = SSL3_ST_CW_CHANGE_A; 526 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 527 } else 528#endif 529 s->state = SSL3_ST_CW_CHANGE_A; 530 s->init_num = 0; 531 break; 532 533 case SSL3_ST_CW_CHANGE_A: 534 case SSL3_ST_CW_CHANGE_B: 535 if (!s->hit) 536 dtls1_start_timer(s); 537 ret = dtls1_send_change_cipher_spec(s, 538 SSL3_ST_CW_CHANGE_A, 539 SSL3_ST_CW_CHANGE_B); 540 if (ret <= 0) 541 goto end; 542 543 s->state = SSL3_ST_CW_FINISHED_A; 544 s->init_num = 0; 545 546 s->session->cipher = s->s3->tmp.new_cipher; 547#ifdef OPENSSL_NO_COMP 548 s->session->compress_meth = 0; 549#else 550 if (s->s3->tmp.new_compression == NULL) 551 s->session->compress_meth = 0; 552 else 553 s->session->compress_meth = s->s3->tmp.new_compression->id; 554#endif 555 if (!s->method->ssl3_enc->setup_key_block(s)) { 556 ret = -1; 557 s->state = SSL_ST_ERR; 558 goto end; 559 } 560 561 if (!s->method->ssl3_enc->change_cipher_state(s, 562 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 563 { 564 ret = -1; 565 s->state = SSL_ST_ERR; 566 goto end; 567 } 568#ifndef OPENSSL_NO_SCTP 569 if (s->hit) { 570 /* 571 * Change to new shared key of SCTP-Auth, will be ignored if 572 * no SCTP used. 573 */ 574 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 575 0, NULL); 576 } 577#endif 578 579 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 580 break; 581 582 case SSL3_ST_CW_FINISHED_A: 583 case SSL3_ST_CW_FINISHED_B: 584 if (!s->hit) 585 dtls1_start_timer(s); 586 ret = dtls1_send_finished(s, 587 SSL3_ST_CW_FINISHED_A, 588 SSL3_ST_CW_FINISHED_B, 589 s->method-> 590 ssl3_enc->client_finished_label, 591 s->method-> 592 ssl3_enc->client_finished_label_len); 593 if (ret <= 0) 594 goto end; 595 s->state = SSL3_ST_CW_FLUSH; 596 597 /* clear flags */ 598 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER; 599 if (s->hit) { 600 s->s3->tmp.next_state = SSL_ST_OK; 601#ifndef OPENSSL_NO_SCTP 602 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 603 s->d1->next_state = s->s3->tmp.next_state; 604 s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 605 } 606#endif 607 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) { 608 s->state = SSL_ST_OK; 609#ifndef OPENSSL_NO_SCTP 610 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 611 s->d1->next_state = SSL_ST_OK; 612 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 613 } 614#endif 615 s->s3->flags |= SSL3_FLAGS_POP_BUFFER; 616 s->s3->delay_buf_pop_ret = 0; 617 } 618 } else { 619#ifndef OPENSSL_NO_SCTP 620 /* 621 * Change to new shared key of SCTP-Auth, will be ignored if 622 * no SCTP used. 623 */ 624 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 625 0, NULL); 626#endif 627 628#ifndef OPENSSL_NO_TLSEXT 629 /* 630 * Allow NewSessionTicket if ticket expected 631 */ 632 if (s->tlsext_ticket_expected) 633 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A; 634 else 635#endif 636 637 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A; 638 } 639 s->init_num = 0; 640 break; 641 642#ifndef OPENSSL_NO_TLSEXT 643 case SSL3_ST_CR_SESSION_TICKET_A: 644 case SSL3_ST_CR_SESSION_TICKET_B: 645 ret = ssl3_get_new_session_ticket(s); 646 if (ret <= 0) 647 goto end; 648 s->state = SSL3_ST_CR_FINISHED_A; 649 s->init_num = 0; 650 break; 651 652 case SSL3_ST_CR_CERT_STATUS_A: 653 case SSL3_ST_CR_CERT_STATUS_B: 654 ret = ssl3_get_cert_status(s); 655 if (ret <= 0) 656 goto end; 657 s->state = SSL3_ST_CR_KEY_EXCH_A; 658 s->init_num = 0; 659 break; 660#endif 661 662 case SSL3_ST_CR_FINISHED_A: 663 case SSL3_ST_CR_FINISHED_B: 664 s->d1->change_cipher_spec_ok = 1; 665 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 666 SSL3_ST_CR_FINISHED_B); 667 if (ret <= 0) 668 goto end; 669 dtls1_stop_timer(s); 670 671 if (s->hit) 672 s->state = SSL3_ST_CW_CHANGE_A; 673 else 674 s->state = SSL_ST_OK; 675 676#ifndef OPENSSL_NO_SCTP 677 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 678 state == SSL_ST_RENEGOTIATE) { 679 s->d1->next_state = s->state; 680 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 681 } 682#endif 683 684 s->init_num = 0; 685 break; 686 687 case SSL3_ST_CW_FLUSH: 688 s->rwstate = SSL_WRITING; 689 if (BIO_flush(s->wbio) <= 0) { 690 /* 691 * If the write error was fatal, stop trying 692 */ 693 if (!BIO_should_retry(s->wbio)) { 694 s->rwstate = SSL_NOTHING; 695 s->state = s->s3->tmp.next_state; 696 } 697 698 ret = -1; 699 goto end; 700 } 701 s->rwstate = SSL_NOTHING; 702 s->state = s->s3->tmp.next_state; 703 break; 704 705 case SSL_ST_OK: 706 /* clean a few things up */ 707 ssl3_cleanup_key_block(s); 708 709#if 0 710 if (s->init_buf != NULL) { 711 BUF_MEM_free(s->init_buf); 712 s->init_buf = NULL; 713 } 714#endif 715 716 /* 717 * If we are not 'joining' the last two packets, remove the 718 * buffering now 719 */ 720 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 721 ssl_free_wbio_buffer(s); 722 /* else do it later in ssl3_write */ 723 724 s->init_num = 0; 725 s->renegotiate = 0; 726 s->new_session = 0; 727 728 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 729 if (s->hit) 730 s->ctx->stats.sess_hit++; 731 732 ret = 1; 733 /* s->server=0; */ 734 s->handshake_func = dtls1_connect; 735 s->ctx->stats.sess_connect_good++; 736 737 if (cb != NULL) 738 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 739 740 /* done with handshaking */ 741 s->d1->handshake_read_seq = 0; 742 s->d1->next_handshake_write_seq = 0; 743 dtls1_clear_received_buffer(s); 744 goto end; 745 /* break; */ 746 747 case SSL_ST_ERR: 748 default: 749 SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE); 750 ret = -1; 751 goto end; 752 /* break; */ 753 } 754 755 /* did we do anything */ 756 if (!s->s3->tmp.reuse_message && !skip) { 757 if (s->debug) { 758 if ((ret = BIO_flush(s->wbio)) <= 0) 759 goto end; 760 } 761 762 if ((cb != NULL) && (s->state != state)) { 763 new_state = s->state; 764 s->state = state; 765 cb(s, SSL_CB_CONNECT_LOOP, 1); 766 s->state = new_state; 767 } 768 } 769 skip = 0; 770 } 771 end: 772 s->in_handshake--; 773 774#ifndef OPENSSL_NO_SCTP 775 /* 776 * Notify SCTP BIO socket to leave handshake mode and allow stream 777 * identifier other than 0. Will be ignored if no SCTP is used. 778 */ 779 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 780 s->in_handshake, NULL); 781#endif 782 783 if (buf != NULL) 784 BUF_MEM_free(buf); 785 if (cb != NULL) 786 cb(s, SSL_CB_CONNECT_EXIT, ret); 787 return (ret); 788} 789 790int dtls1_client_hello(SSL *s) 791{ 792 unsigned char *buf; 793 unsigned char *p, *d; 794 unsigned int i, j; 795 unsigned long l; 796 SSL_COMP *comp; 797 798 buf = (unsigned char *)s->init_buf->data; 799 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) { 800 SSL_SESSION *sess = s->session; 801 if ((s->session == NULL) || (s->session->ssl_version != s->version) || 802#ifdef OPENSSL_NO_TLSEXT 803 !sess->session_id_length || 804#else 805 (!sess->session_id_length && !sess->tlsext_tick) || 806#endif 807 (s->session->not_resumable)) { 808 if (!ssl_get_new_session(s, 0)) 809 goto err; 810 } 811 /* else use the pre-loaded session */ 812 813 p = s->s3->client_random; 814 815 /* 816 * if client_random is initialized, reuse it, we are required to use 817 * same upon reply to HelloVerify 818 */ 819 for (i = 0; p[i] == '\0' && i < sizeof(s->s3->client_random); i++) ; 820 if (i == sizeof(s->s3->client_random)) 821 ssl_fill_hello_random(s, 0, p, sizeof(s->s3->client_random)); 822 823 /* Do the message type and length last */ 824 d = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 825 826 *(p++) = s->version >> 8; 827 *(p++) = s->version & 0xff; 828 s->client_version = s->version; 829 830 /* Random stuff */ 831 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 832 p += SSL3_RANDOM_SIZE; 833 834 /* Session ID */ 835 if (s->new_session) 836 i = 0; 837 else 838 i = s->session->session_id_length; 839 *(p++) = i; 840 if (i != 0) { 841 if (i > sizeof s->session->session_id) { 842 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 843 goto err; 844 } 845 memcpy(p, s->session->session_id, i); 846 p += i; 847 } 848 849 /* cookie stuff */ 850 if (s->d1->cookie_len > sizeof(s->d1->cookie)) { 851 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 852 goto err; 853 } 854 *(p++) = s->d1->cookie_len; 855 memcpy(p, s->d1->cookie, s->d1->cookie_len); 856 p += s->d1->cookie_len; 857 858 /* Ciphers supported */ 859 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0); 860 if (i == 0) { 861 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); 862 goto err; 863 } 864 s2n(i, p); 865 p += i; 866 867 /* COMPRESSION */ 868 if (s->ctx->comp_methods == NULL) 869 j = 0; 870 else 871 j = sk_SSL_COMP_num(s->ctx->comp_methods); 872 *(p++) = 1 + j; 873 for (i = 0; i < j; i++) { 874 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i); 875 *(p++) = comp->id; 876 } 877 *(p++) = 0; /* Add the NULL method */ 878 879#ifndef OPENSSL_NO_TLSEXT 880 /* TLS extensions */ 881 if (ssl_prepare_clienthello_tlsext(s) <= 0) { 882 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); 883 goto err; 884 } 885 if ((p = 886 ssl_add_clienthello_tlsext(s, p, 887 buf + SSL3_RT_MAX_PLAIN_LENGTH)) == 888 NULL) { 889 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 890 goto err; 891 } 892#endif 893 894 l = (p - d); 895 d = buf; 896 897 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l); 898 899 s->state = SSL3_ST_CW_CLNT_HELLO_B; 900 /* number of bytes to write */ 901 s->init_num = p - buf; 902 s->init_off = 0; 903 904 /* buffer the message to handle re-xmits */ 905 dtls1_buffer_message(s, 0); 906 } 907 908 /* SSL3_ST_CW_CLNT_HELLO_B */ 909 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 910 err: 911 return (-1); 912} 913 914static int dtls1_get_hello_verify(SSL *s) 915{ 916 int n, al, ok = 0; 917 unsigned char *data; 918 unsigned int cookie_len; 919 920 n = s->method->ssl_get_message(s, 921 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 922 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 923 -1, s->max_cert_list, &ok); 924 925 if (!ok) 926 return ((int)n); 927 928 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 929 s->d1->send_cookie = 0; 930 s->s3->tmp.reuse_message = 1; 931 return (1); 932 } 933 934 data = (unsigned char *)s->init_msg; 935 936 if ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))) { 937 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION); 938 s->version = (s->version & 0xff00) | data[1]; 939 al = SSL_AD_PROTOCOL_VERSION; 940 goto f_err; 941 } 942 data += 2; 943 944 cookie_len = *(data++); 945 if (cookie_len > sizeof(s->d1->cookie)) { 946 al = SSL_AD_ILLEGAL_PARAMETER; 947 goto f_err; 948 } 949 950 memcpy(s->d1->cookie, data, cookie_len); 951 s->d1->cookie_len = cookie_len; 952 953 s->d1->send_cookie = 1; 954 return 1; 955 956 f_err: 957 ssl3_send_alert(s, SSL3_AL_FATAL, al); 958 s->state = SSL_ST_ERR; 959 return -1; 960} 961 962int dtls1_send_client_key_exchange(SSL *s) 963{ 964 unsigned char *p, *d; 965 int n; 966 unsigned long alg_k; 967#ifndef OPENSSL_NO_RSA 968 unsigned char *q; 969 EVP_PKEY *pkey = NULL; 970#endif 971#ifndef OPENSSL_NO_KRB5 972 KSSL_ERR kssl_err; 973#endif /* OPENSSL_NO_KRB5 */ 974#ifndef OPENSSL_NO_ECDH 975 EC_KEY *clnt_ecdh = NULL; 976 const EC_POINT *srvr_ecpoint = NULL; 977 EVP_PKEY *srvr_pub_pkey = NULL; 978 unsigned char *encodedPoint = NULL; 979 int encoded_pt_len = 0; 980 BN_CTX *bn_ctx = NULL; 981#endif 982 983 if (s->state == SSL3_ST_CW_KEY_EXCH_A) { 984 d = (unsigned char *)s->init_buf->data; 985 p = &(d[DTLS1_HM_HEADER_LENGTH]); 986 987 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 988 989 /* Fool emacs indentation */ 990 if (0) { 991 } 992#ifndef OPENSSL_NO_RSA 993 else if (alg_k & SSL_kRSA) { 994 RSA *rsa; 995 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 996 997 if (s->session->sess_cert == NULL) { 998 /* 999 * We should always have a server certificate with SSL_kRSA. 1000 */ 1001 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1002 ERR_R_INTERNAL_ERROR); 1003 goto err; 1004 } 1005 1006 if (s->session->sess_cert->peer_rsa_tmp != NULL) 1007 rsa = s->session->sess_cert->peer_rsa_tmp; 1008 else { 1009 pkey = 1010 X509_get_pubkey(s->session-> 1011 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC]. 1012 x509); 1013 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) 1014 || (pkey->pkey.rsa == NULL)) { 1015 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1016 ERR_R_INTERNAL_ERROR); 1017 goto err; 1018 } 1019 rsa = pkey->pkey.rsa; 1020 EVP_PKEY_free(pkey); 1021 } 1022 1023 tmp_buf[0] = s->client_version >> 8; 1024 tmp_buf[1] = s->client_version & 0xff; 1025 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0) 1026 goto err; 1027 1028 s->session->master_key_length = sizeof tmp_buf; 1029 1030 q = p; 1031 /* Fix buf for TLS and [incidentally] DTLS */ 1032 if (s->version > SSL3_VERSION) 1033 p += 2; 1034 n = RSA_public_encrypt(sizeof tmp_buf, 1035 tmp_buf, p, rsa, RSA_PKCS1_PADDING); 1036# ifdef PKCS1_CHECK 1037 if (s->options & SSL_OP_PKCS1_CHECK_1) 1038 p[1]++; 1039 if (s->options & SSL_OP_PKCS1_CHECK_2) 1040 tmp_buf[0] = 0x70; 1041# endif 1042 if (n <= 0) { 1043 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1044 SSL_R_BAD_RSA_ENCRYPT); 1045 goto err; 1046 } 1047 1048 /* Fix buf for TLS and [incidentally] DTLS */ 1049 if (s->version > SSL3_VERSION) { 1050 s2n(n, q); 1051 n += 2; 1052 } 1053 1054 s->session->master_key_length = 1055 s->method->ssl3_enc->generate_master_secret(s, 1056 s-> 1057 session->master_key, 1058 tmp_buf, 1059 sizeof tmp_buf); 1060 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 1061 } 1062#endif 1063#ifndef OPENSSL_NO_KRB5 1064 else if (alg_k & SSL_kKRB5) { 1065 krb5_error_code krb5rc; 1066 KSSL_CTX *kssl_ctx = s->kssl_ctx; 1067 /* krb5_data krb5_ap_req; */ 1068 krb5_data *enc_ticket; 1069 krb5_data authenticator, *authp = NULL; 1070 EVP_CIPHER_CTX ciph_ctx; 1071 const EVP_CIPHER *enc = NULL; 1072 unsigned char iv[EVP_MAX_IV_LENGTH]; 1073 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 1074 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH]; 1075 int padl, outl = sizeof(epms); 1076 1077 EVP_CIPHER_CTX_init(&ciph_ctx); 1078 1079# ifdef KSSL_DEBUG 1080 printf("ssl3_send_client_key_exchange(%lx & %lx)\n", 1081 alg_k, SSL_kKRB5); 1082# endif /* KSSL_DEBUG */ 1083 1084 authp = NULL; 1085# ifdef KRB5SENDAUTH 1086 if (KRB5SENDAUTH) 1087 authp = &authenticator; 1088# endif /* KRB5SENDAUTH */ 1089 1090 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err); 1091 enc = kssl_map_enc(kssl_ctx->enctype); 1092 if (enc == NULL) 1093 goto err; 1094# ifdef KSSL_DEBUG 1095 { 1096 printf("kssl_cget_tkt rtn %d\n", krb5rc); 1097 if (krb5rc && kssl_err.text) 1098 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 1099 } 1100# endif /* KSSL_DEBUG */ 1101 1102 if (krb5rc) { 1103 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1104 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason); 1105 goto err; 1106 } 1107 1108 /*- 1109 * 20010406 VRS - Earlier versions used KRB5 AP_REQ 1110 ** in place of RFC 2712 KerberosWrapper, as in: 1111 ** 1112 ** Send ticket (copy to *p, set n = length) 1113 ** n = krb5_ap_req.length; 1114 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 1115 ** if (krb5_ap_req.data) 1116 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 1117 ** 1118 ** Now using real RFC 2712 KerberosWrapper 1119 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) 1120 ** Note: 2712 "opaque" types are here replaced 1121 ** with a 2-byte length followed by the value. 1122 ** Example: 1123 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 1124 ** Where "xx xx" = length bytes. Shown here with 1125 ** optional authenticator omitted. 1126 */ 1127 1128 /* KerberosWrapper.Ticket */ 1129 s2n(enc_ticket->length, p); 1130 memcpy(p, enc_ticket->data, enc_ticket->length); 1131 p += enc_ticket->length; 1132 n = enc_ticket->length + 2; 1133 1134 /* KerberosWrapper.Authenticator */ 1135 if (authp && authp->length) { 1136 s2n(authp->length, p); 1137 memcpy(p, authp->data, authp->length); 1138 p += authp->length; 1139 n += authp->length + 2; 1140 1141 free(authp->data); 1142 authp->data = NULL; 1143 authp->length = 0; 1144 } else { 1145 s2n(0, p); /* null authenticator length */ 1146 n += 2; 1147 } 1148 1149 if (RAND_bytes(tmp_buf, sizeof tmp_buf) <= 0) 1150 goto err; 1151 1152 /*- 1153 * 20010420 VRS. Tried it this way; failed. 1154 * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 1155 * EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 1156 * kssl_ctx->length); 1157 * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 1158 */ 1159 1160 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 1161 EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv); 1162 EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf, 1163 sizeof tmp_buf); 1164 EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl); 1165 outl += padl; 1166 if (outl > (int)sizeof epms) { 1167 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1168 ERR_R_INTERNAL_ERROR); 1169 goto err; 1170 } 1171 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 1172 1173 /* KerberosWrapper.EncryptedPreMasterSecret */ 1174 s2n(outl, p); 1175 memcpy(p, epms, outl); 1176 p += outl; 1177 n += outl + 2; 1178 1179 s->session->master_key_length = 1180 s->method->ssl3_enc->generate_master_secret(s, 1181 s-> 1182 session->master_key, 1183 tmp_buf, 1184 sizeof tmp_buf); 1185 1186 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 1187 OPENSSL_cleanse(epms, outl); 1188 } 1189#endif 1190#ifndef OPENSSL_NO_DH 1191 else if (alg_k & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) { 1192 DH *dh_srvr, *dh_clnt; 1193 1194 if (s->session->sess_cert == NULL) { 1195 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1196 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1197 SSL_R_UNEXPECTED_MESSAGE); 1198 goto err; 1199 } 1200 1201 if (s->session->sess_cert->peer_dh_tmp != NULL) 1202 dh_srvr = s->session->sess_cert->peer_dh_tmp; 1203 else { 1204 /* we get them from the cert */ 1205 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1206 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1207 SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1208 goto err; 1209 } 1210 1211 /* generate a new random key */ 1212 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 1213 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 1214 goto err; 1215 } 1216 if (!DH_generate_key(dh_clnt)) { 1217 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 1218 goto err; 1219 } 1220 1221 /* 1222 * use the 'p' output buffer for the DH key, but make sure to 1223 * clear it out afterwards 1224 */ 1225 1226 n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt); 1227 1228 if (n <= 0) { 1229 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 1230 goto err; 1231 } 1232 1233 /* generate master key from the result */ 1234 s->session->master_key_length = 1235 s->method->ssl3_enc->generate_master_secret(s, 1236 s-> 1237 session->master_key, 1238 p, n); 1239 /* clean up */ 1240 memset(p, 0, n); 1241 1242 /* send off the data */ 1243 n = BN_num_bytes(dh_clnt->pub_key); 1244 s2n(n, p); 1245 BN_bn2bin(dh_clnt->pub_key, p); 1246 n += 2; 1247 1248 DH_free(dh_clnt); 1249 1250 /* perhaps clean things up a bit EAY EAY EAY EAY */ 1251 } 1252#endif 1253#ifndef OPENSSL_NO_ECDH 1254 else if (alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)) { 1255 const EC_GROUP *srvr_group = NULL; 1256 EC_KEY *tkey; 1257 int ecdh_clnt_cert = 0; 1258 int field_size = 0; 1259 1260 if (s->session->sess_cert == NULL) { 1261 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1262 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1263 SSL_R_UNEXPECTED_MESSAGE); 1264 goto err; 1265 } 1266 1267 /* 1268 * Did we send out the client's ECDH share for use in premaster 1269 * computation as part of client certificate? If so, set 1270 * ecdh_clnt_cert to 1. 1271 */ 1272 if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) { 1273 /* 1274 * XXX: For now, we do not support client authentication 1275 * using ECDH certificates. To add such support, one needs to 1276 * add code that checks for appropriate conditions and sets 1277 * ecdh_clnt_cert to 1. For example, the cert have an ECC key 1278 * on the same curve as the server's and the key should be 1279 * authorized for key agreement. One also needs to add code 1280 * in ssl3_connect to skip sending the certificate verify 1281 * message. if ((s->cert->key->privatekey != NULL) && 1282 * (s->cert->key->privatekey->type == EVP_PKEY_EC) && ...) 1283 * ecdh_clnt_cert = 1; 1284 */ 1285 } 1286 1287 if (s->session->sess_cert->peer_ecdh_tmp != NULL) { 1288 tkey = s->session->sess_cert->peer_ecdh_tmp; 1289 } else { 1290 /* Get the Server Public Key from Cert */ 1291 srvr_pub_pkey = 1292 X509_get_pubkey(s->session-> 1293 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1294 if ((srvr_pub_pkey == NULL) 1295 || (srvr_pub_pkey->type != EVP_PKEY_EC) 1296 || (srvr_pub_pkey->pkey.ec == NULL)) { 1297 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1298 ERR_R_INTERNAL_ERROR); 1299 goto err; 1300 } 1301 1302 tkey = srvr_pub_pkey->pkey.ec; 1303 } 1304 1305 srvr_group = EC_KEY_get0_group(tkey); 1306 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 1307 1308 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) { 1309 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1310 ERR_R_INTERNAL_ERROR); 1311 goto err; 1312 } 1313 1314 if ((clnt_ecdh = EC_KEY_new()) == NULL) { 1315 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1316 ERR_R_MALLOC_FAILURE); 1317 goto err; 1318 } 1319 1320 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) { 1321 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); 1322 goto err; 1323 } 1324 if (ecdh_clnt_cert) { 1325 /* 1326 * Reuse key info from our certificate We only need our 1327 * private key to perform the ECDH computation. 1328 */ 1329 const BIGNUM *priv_key; 1330 tkey = s->cert->key->privatekey->pkey.ec; 1331 priv_key = EC_KEY_get0_private_key(tkey); 1332 if (priv_key == NULL) { 1333 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1334 ERR_R_MALLOC_FAILURE); 1335 goto err; 1336 } 1337 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) { 1338 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1339 ERR_R_EC_LIB); 1340 goto err; 1341 } 1342 } else { 1343 /* Generate a new ECDH key pair */ 1344 if (!(EC_KEY_generate_key(clnt_ecdh))) { 1345 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1346 ERR_R_ECDH_LIB); 1347 goto err; 1348 } 1349 } 1350 1351 /* 1352 * use the 'p' output buffer for the ECDH key, but make sure to 1353 * clear it out afterwards 1354 */ 1355 1356 field_size = EC_GROUP_get_degree(srvr_group); 1357 if (field_size <= 0) { 1358 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1359 goto err; 1360 } 1361 n = ECDH_compute_key(p, (field_size + 7) / 8, srvr_ecpoint, 1362 clnt_ecdh, NULL); 1363 if (n <= 0) { 1364 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1365 goto err; 1366 } 1367 1368 /* generate master key from the result */ 1369 s->session->master_key_length = 1370 s->method->ssl3_enc->generate_master_secret(s, 1371 s-> 1372 session->master_key, 1373 p, n); 1374 1375 memset(p, 0, n); /* clean up */ 1376 1377 if (ecdh_clnt_cert) { 1378 /* Send empty client key exch message */ 1379 n = 0; 1380 } else { 1381 /* 1382 * First check the size of encoding and allocate memory 1383 * accordingly. 1384 */ 1385 encoded_pt_len = 1386 EC_POINT_point2oct(srvr_group, 1387 EC_KEY_get0_public_key(clnt_ecdh), 1388 POINT_CONVERSION_UNCOMPRESSED, 1389 NULL, 0, NULL); 1390 1391 encodedPoint = (unsigned char *) 1392 OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char)); 1393 bn_ctx = BN_CTX_new(); 1394 if ((encodedPoint == NULL) || (bn_ctx == NULL)) { 1395 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1396 ERR_R_MALLOC_FAILURE); 1397 goto err; 1398 } 1399 1400 /* Encode the public key */ 1401 n = EC_POINT_point2oct(srvr_group, 1402 EC_KEY_get0_public_key(clnt_ecdh), 1403 POINT_CONVERSION_UNCOMPRESSED, 1404 encodedPoint, encoded_pt_len, bn_ctx); 1405 1406 *p = n; /* length of encoded point */ 1407 /* Encoded point will be copied here */ 1408 p += 1; 1409 /* copy the point */ 1410 memcpy((unsigned char *)p, encodedPoint, n); 1411 /* increment n to account for length field */ 1412 n += 1; 1413 } 1414 1415 /* Free allocated memory */ 1416 BN_CTX_free(bn_ctx); 1417 if (encodedPoint != NULL) 1418 OPENSSL_free(encodedPoint); 1419 if (clnt_ecdh != NULL) 1420 EC_KEY_free(clnt_ecdh); 1421 EVP_PKEY_free(srvr_pub_pkey); 1422 } 1423#endif /* !OPENSSL_NO_ECDH */ 1424 1425#ifndef OPENSSL_NO_PSK 1426 else if (alg_k & SSL_kPSK) { 1427 char identity[PSK_MAX_IDENTITY_LEN]; 1428 unsigned char *t = NULL; 1429 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN * 2 + 4]; 1430 unsigned int pre_ms_len = 0, psk_len = 0; 1431 int psk_err = 1; 1432 1433 n = 0; 1434 if (s->psk_client_callback == NULL) { 1435 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1436 SSL_R_PSK_NO_CLIENT_CB); 1437 goto err; 1438 } 1439 1440 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint, 1441 identity, PSK_MAX_IDENTITY_LEN, 1442 psk_or_pre_ms, 1443 sizeof(psk_or_pre_ms)); 1444 if (psk_len > PSK_MAX_PSK_LEN) { 1445 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1446 ERR_R_INTERNAL_ERROR); 1447 goto psk_err; 1448 } else if (psk_len == 0) { 1449 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1450 SSL_R_PSK_IDENTITY_NOT_FOUND); 1451 goto psk_err; 1452 } 1453 1454 /* create PSK pre_master_secret */ 1455 pre_ms_len = 2 + psk_len + 2 + psk_len; 1456 t = psk_or_pre_ms; 1457 memmove(psk_or_pre_ms + psk_len + 4, psk_or_pre_ms, psk_len); 1458 s2n(psk_len, t); 1459 memset(t, 0, psk_len); 1460 t += psk_len; 1461 s2n(psk_len, t); 1462 1463 if (s->session->psk_identity_hint != NULL) 1464 OPENSSL_free(s->session->psk_identity_hint); 1465 s->session->psk_identity_hint = 1466 BUF_strdup(s->ctx->psk_identity_hint); 1467 if (s->ctx->psk_identity_hint != NULL 1468 && s->session->psk_identity_hint == NULL) { 1469 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1470 ERR_R_MALLOC_FAILURE); 1471 goto psk_err; 1472 } 1473 1474 if (s->session->psk_identity != NULL) 1475 OPENSSL_free(s->session->psk_identity); 1476 s->session->psk_identity = BUF_strdup(identity); 1477 if (s->session->psk_identity == NULL) { 1478 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1479 ERR_R_MALLOC_FAILURE); 1480 goto psk_err; 1481 } 1482 1483 s->session->master_key_length = 1484 s->method->ssl3_enc->generate_master_secret(s, 1485 s-> 1486 session->master_key, 1487 psk_or_pre_ms, 1488 pre_ms_len); 1489 n = strlen(identity); 1490 s2n(n, p); 1491 memcpy(p, identity, n); 1492 n += 2; 1493 psk_err = 0; 1494 psk_err: 1495 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN); 1496 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1497 if (psk_err != 0) { 1498 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1499 goto err; 1500 } 1501 } 1502#endif 1503 else { 1504 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1505 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1506 ERR_R_INTERNAL_ERROR); 1507 goto err; 1508 } 1509 1510 d = dtls1_set_message_header(s, d, 1511 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); 1512 /*- 1513 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 1514 l2n3(n,d); 1515 l2n(s->d1->handshake_write_seq,d); 1516 s->d1->handshake_write_seq++; 1517 */ 1518 1519 s->state = SSL3_ST_CW_KEY_EXCH_B; 1520 /* number of bytes to write */ 1521 s->init_num = n + DTLS1_HM_HEADER_LENGTH; 1522 s->init_off = 0; 1523 1524 /* buffer the message to handle re-xmits */ 1525 dtls1_buffer_message(s, 0); 1526 } 1527 1528 /* SSL3_ST_CW_KEY_EXCH_B */ 1529 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1530 err: 1531#ifndef OPENSSL_NO_ECDH 1532 BN_CTX_free(bn_ctx); 1533 if (encodedPoint != NULL) 1534 OPENSSL_free(encodedPoint); 1535 if (clnt_ecdh != NULL) 1536 EC_KEY_free(clnt_ecdh); 1537 EVP_PKEY_free(srvr_pub_pkey); 1538#endif 1539 return (-1); 1540} 1541 1542int dtls1_send_client_verify(SSL *s) 1543{ 1544 unsigned char *p, *d; 1545 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; 1546 EVP_PKEY *pkey; 1547#ifndef OPENSSL_NO_RSA 1548 unsigned u = 0; 1549#endif 1550 unsigned long n; 1551#if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA) 1552 int j; 1553#endif 1554 1555 if (s->state == SSL3_ST_CW_CERT_VRFY_A) { 1556 d = (unsigned char *)s->init_buf->data; 1557 p = &(d[DTLS1_HM_HEADER_LENGTH]); 1558 pkey = s->cert->key->privatekey; 1559 1560 s->method->ssl3_enc->cert_verify_mac(s, 1561 NID_sha1, 1562 &(data[MD5_DIGEST_LENGTH])); 1563 1564#ifndef OPENSSL_NO_RSA 1565 if (pkey->type == EVP_PKEY_RSA) { 1566 s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0])); 1567 if (RSA_sign(NID_md5_sha1, data, 1568 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, 1569 &(p[2]), &u, pkey->pkey.rsa) <= 0) { 1570 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB); 1571 goto err; 1572 } 1573 s2n(u, p); 1574 n = u + 2; 1575 } else 1576#endif 1577#ifndef OPENSSL_NO_DSA 1578 if (pkey->type == EVP_PKEY_DSA) { 1579 if (!DSA_sign(pkey->save_type, 1580 &(data[MD5_DIGEST_LENGTH]), 1581 SHA_DIGEST_LENGTH, &(p[2]), 1582 (unsigned int *)&j, pkey->pkey.dsa)) { 1583 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB); 1584 goto err; 1585 } 1586 s2n(j, p); 1587 n = j + 2; 1588 } else 1589#endif 1590#ifndef OPENSSL_NO_ECDSA 1591 if (pkey->type == EVP_PKEY_EC) { 1592 if (!ECDSA_sign(pkey->save_type, 1593 &(data[MD5_DIGEST_LENGTH]), 1594 SHA_DIGEST_LENGTH, &(p[2]), 1595 (unsigned int *)&j, pkey->pkey.ec)) { 1596 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB); 1597 goto err; 1598 } 1599 s2n(j, p); 1600 n = j + 2; 1601 } else 1602#endif 1603 { 1604 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); 1605 goto err; 1606 } 1607 1608 d = dtls1_set_message_header(s, d, 1609 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n); 1610 1611 s->init_num = (int)n + DTLS1_HM_HEADER_LENGTH; 1612 s->init_off = 0; 1613 1614 /* buffer the message to handle re-xmits */ 1615 dtls1_buffer_message(s, 0); 1616 1617 s->state = SSL3_ST_CW_CERT_VRFY_B; 1618 } 1619 1620 /* s->state = SSL3_ST_CW_CERT_VRFY_B */ 1621 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1622 err: 1623 return (-1); 1624} 1625 1626int dtls1_send_client_certificate(SSL *s) 1627{ 1628 X509 *x509 = NULL; 1629 EVP_PKEY *pkey = NULL; 1630 int i; 1631 unsigned long l; 1632 1633 if (s->state == SSL3_ST_CW_CERT_A) { 1634 if ((s->cert == NULL) || 1635 (s->cert->key->x509 == NULL) || 1636 (s->cert->key->privatekey == NULL)) 1637 s->state = SSL3_ST_CW_CERT_B; 1638 else 1639 s->state = SSL3_ST_CW_CERT_C; 1640 } 1641 1642 /* We need to get a client cert */ 1643 if (s->state == SSL3_ST_CW_CERT_B) { 1644 /* 1645 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP; 1646 * return(-1); We then get retied later 1647 */ 1648 i = 0; 1649 i = ssl_do_client_cert_cb(s, &x509, &pkey); 1650 if (i < 0) { 1651 s->rwstate = SSL_X509_LOOKUP; 1652 return (-1); 1653 } 1654 s->rwstate = SSL_NOTHING; 1655 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 1656 s->state = SSL3_ST_CW_CERT_B; 1657 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey)) 1658 i = 0; 1659 } else if (i == 1) { 1660 i = 0; 1661 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE, 1662 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 1663 } 1664 1665 if (x509 != NULL) 1666 X509_free(x509); 1667 if (pkey != NULL) 1668 EVP_PKEY_free(pkey); 1669 if (i == 0) { 1670 if (s->version == SSL3_VERSION) { 1671 s->s3->tmp.cert_req = 0; 1672 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE); 1673 return (1); 1674 } else { 1675 s->s3->tmp.cert_req = 2; 1676 } 1677 } 1678 1679 /* Ok, we have a cert */ 1680 s->state = SSL3_ST_CW_CERT_C; 1681 } 1682 1683 if (s->state == SSL3_ST_CW_CERT_C) { 1684 s->state = SSL3_ST_CW_CERT_D; 1685 l = dtls1_output_cert_chain(s, 1686 (s->s3->tmp.cert_req == 1687 2) ? NULL : s->cert->key->x509); 1688 if (!l) { 1689 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); 1690 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); 1691 return 0; 1692 } 1693 s->init_num = (int)l; 1694 s->init_off = 0; 1695 1696 /* set header called by dtls1_output_cert_chain() */ 1697 1698 /* buffer the message to handle re-xmits */ 1699 dtls1_buffer_message(s, 0); 1700 } 1701 /* SSL3_ST_CW_CERT_D */ 1702 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1703} 1704