d1_clnt.c revision 279264
1/* ssl/d1_clnt.c */ 2/* 3 * DTLS implementation written by Nagendra Modadugu 4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. 5 */ 6/* ==================================================================== 7 * Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * openssl-core@OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay@cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh@cryptsoft.com). 57 * 58 */ 59/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 60 * All rights reserved. 61 * 62 * This package is an SSL implementation written 63 * by Eric Young (eay@cryptsoft.com). 64 * The implementation was written so as to conform with Netscapes SSL. 65 * 66 * This library is free for commercial and non-commercial use as long as 67 * the following conditions are aheared to. The following conditions 68 * apply to all code found in this distribution, be it the RC4, RSA, 69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 70 * included with this distribution is covered by the same copyright terms 71 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 72 * 73 * Copyright remains Eric Young's, and as such any Copyright notices in 74 * the code are not to be removed. 75 * If this package is used in a product, Eric Young should be given attribution 76 * as the author of the parts of the library used. 77 * This can be in the form of a textual message at program startup or 78 * in documentation (online or textual) provided with the package. 79 * 80 * Redistribution and use in source and binary forms, with or without 81 * modification, are permitted provided that the following conditions 82 * are met: 83 * 1. Redistributions of source code must retain the copyright 84 * notice, this list of conditions and the following disclaimer. 85 * 2. Redistributions in binary form must reproduce the above copyright 86 * notice, this list of conditions and the following disclaimer in the 87 * documentation and/or other materials provided with the distribution. 88 * 3. All advertising materials mentioning features or use of this software 89 * must display the following acknowledgement: 90 * "This product includes cryptographic software written by 91 * Eric Young (eay@cryptsoft.com)" 92 * The word 'cryptographic' can be left out if the rouines from the library 93 * being used are not cryptographic related :-). 94 * 4. If you include any Windows specific code (or a derivative thereof) from 95 * the apps directory (application code) you must include an acknowledgement: 96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 97 * 98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 101 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 108 * SUCH DAMAGE. 109 * 110 * The licence and distribution terms for any publically available version or 111 * derivative of this code cannot be changed. i.e. this code cannot simply be 112 * copied and put under another distribution licence 113 * [including the GNU Public Licence.] 114 */ 115 116#include <stdio.h> 117#include "ssl_locl.h" 118#ifndef OPENSSL_NO_KRB5 119#include "kssl_lcl.h" 120#endif 121#include <openssl/buffer.h> 122#include <openssl/rand.h> 123#include <openssl/objects.h> 124#include <openssl/evp.h> 125#include <openssl/md5.h> 126#include <openssl/bn.h> 127#ifndef OPENSSL_NO_DH 128#include <openssl/dh.h> 129#endif 130 131static const SSL_METHOD *dtls1_get_client_method(int ver); 132static int dtls1_get_hello_verify(SSL *s); 133 134static const SSL_METHOD *dtls1_get_client_method(int ver) 135 { 136 if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER) 137 return(DTLSv1_client_method()); 138 else 139 return(NULL); 140 } 141 142IMPLEMENT_dtls1_meth_func(DTLSv1_client_method, 143 ssl_undefined_function, 144 dtls1_connect, 145 dtls1_get_client_method) 146 147int dtls1_connect(SSL *s) 148 { 149 BUF_MEM *buf=NULL; 150 unsigned long Time=(unsigned long)time(NULL); 151 void (*cb)(const SSL *ssl,int type,int val)=NULL; 152 int ret= -1; 153 int new_state,state,skip=0; 154#ifndef OPENSSL_NO_SCTP 155 unsigned char sctpauthkey[64]; 156 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; 157#endif 158 159 RAND_add(&Time,sizeof(Time),0); 160 ERR_clear_error(); 161 clear_sys_error(); 162 163 if (s->info_callback != NULL) 164 cb=s->info_callback; 165 else if (s->ctx->info_callback != NULL) 166 cb=s->ctx->info_callback; 167 168 s->in_handshake++; 169 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 170 171#ifndef OPENSSL_NO_SCTP 172 /* Notify SCTP BIO socket to enter handshake 173 * mode and prevent stream identifier other 174 * than 0. Will be ignored if no SCTP is used. 175 */ 176 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL); 177#endif 178 179#ifndef OPENSSL_NO_HEARTBEATS 180 /* If we're awaiting a HeartbeatResponse, pretend we 181 * already got and don't await it anymore, because 182 * Heartbeats don't make sense during handshakes anyway. 183 */ 184 if (s->tlsext_hb_pending) 185 { 186 dtls1_stop_timer(s); 187 s->tlsext_hb_pending = 0; 188 s->tlsext_hb_seq++; 189 } 190#endif 191 192 for (;;) 193 { 194 state=s->state; 195 196 switch(s->state) 197 { 198 case SSL_ST_RENEGOTIATE: 199 s->renegotiate=1; 200 s->state=SSL_ST_CONNECT; 201 s->ctx->stats.sess_connect_renegotiate++; 202 /* break */ 203 case SSL_ST_BEFORE: 204 case SSL_ST_CONNECT: 205 case SSL_ST_BEFORE|SSL_ST_CONNECT: 206 case SSL_ST_OK|SSL_ST_CONNECT: 207 208 s->server=0; 209 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 210 211 if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) && 212 (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00)) 213 { 214 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR); 215 ret = -1; 216 goto end; 217 } 218 219 /* s->version=SSL3_VERSION; */ 220 s->type=SSL_ST_CONNECT; 221 222 if (s->init_buf == NULL) 223 { 224 if ((buf=BUF_MEM_new()) == NULL) 225 { 226 ret= -1; 227 goto end; 228 } 229 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 230 { 231 ret= -1; 232 goto end; 233 } 234 s->init_buf=buf; 235 buf=NULL; 236 } 237 238 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } 239 240 /* setup buffing BIO */ 241 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; } 242 243 /* don't push the buffering BIO quite yet */ 244 245 s->state=SSL3_ST_CW_CLNT_HELLO_A; 246 s->ctx->stats.sess_connect++; 247 s->init_num=0; 248 /* mark client_random uninitialized */ 249 memset(s->s3->client_random,0,sizeof(s->s3->client_random)); 250 s->d1->send_cookie = 0; 251 s->hit = 0; 252 s->d1->change_cipher_spec_ok = 0; 253 /* Should have been reset by ssl3_get_finished, too. */ 254 s->s3->change_cipher_spec = 0; 255 break; 256 257#ifndef OPENSSL_NO_SCTP 258 case DTLS1_SCTP_ST_CR_READ_SOCK: 259 260 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) 261 { 262 s->s3->in_read_app_data=2; 263 s->rwstate=SSL_READING; 264 BIO_clear_retry_flags(SSL_get_rbio(s)); 265 BIO_set_retry_read(SSL_get_rbio(s)); 266 ret = -1; 267 goto end; 268 } 269 270 s->state=s->s3->tmp.next_state; 271 break; 272 273 case DTLS1_SCTP_ST_CW_WRITE_SOCK: 274 /* read app data until dry event */ 275 276 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 277 if (ret < 0) goto end; 278 279 if (ret == 0) 280 { 281 s->s3->in_read_app_data=2; 282 s->rwstate=SSL_READING; 283 BIO_clear_retry_flags(SSL_get_rbio(s)); 284 BIO_set_retry_read(SSL_get_rbio(s)); 285 ret = -1; 286 goto end; 287 } 288 289 s->state=s->d1->next_state; 290 break; 291#endif 292 293 case SSL3_ST_CW_CLNT_HELLO_A: 294 case SSL3_ST_CW_CLNT_HELLO_B: 295 296 s->shutdown=0; 297 298 /* every DTLS ClientHello resets Finished MAC */ 299 ssl3_init_finished_mac(s); 300 301 dtls1_start_timer(s); 302 ret=dtls1_client_hello(s); 303 if (ret <= 0) goto end; 304 305 if ( s->d1->send_cookie) 306 { 307 s->state=SSL3_ST_CW_FLUSH; 308 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A; 309 } 310 else 311 s->state=SSL3_ST_CR_SRVR_HELLO_A; 312 313 s->init_num=0; 314 315#ifndef OPENSSL_NO_SCTP 316 /* Disable buffering for SCTP */ 317 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) 318 { 319#endif 320 /* turn on buffering for the next lot of output */ 321 if (s->bbio != s->wbio) 322 s->wbio=BIO_push(s->bbio,s->wbio); 323#ifndef OPENSSL_NO_SCTP 324 } 325#endif 326 327 break; 328 329 case SSL3_ST_CR_SRVR_HELLO_A: 330 case SSL3_ST_CR_SRVR_HELLO_B: 331 ret=ssl3_get_server_hello(s); 332 if (ret <= 0) goto end; 333 else 334 { 335 if (s->hit) 336 { 337#ifndef OPENSSL_NO_SCTP 338 /* Add new shared key for SCTP-Auth, 339 * will be ignored if no SCTP used. 340 */ 341 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 342 DTLS1_SCTP_AUTH_LABEL); 343 344 SSL_export_keying_material(s, sctpauthkey, 345 sizeof(sctpauthkey), labelbuffer, 346 sizeof(labelbuffer), NULL, 0, 0); 347 348 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 349 sizeof(sctpauthkey), sctpauthkey); 350#endif 351 352 s->state=SSL3_ST_CR_FINISHED_A; 353 } 354 else 355 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 356 } 357 s->init_num=0; 358 break; 359 360 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 361 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 362 363 ret = dtls1_get_hello_verify(s); 364 if ( ret <= 0) 365 goto end; 366 dtls1_stop_timer(s); 367 if ( s->d1->send_cookie) /* start again, with a cookie */ 368 s->state=SSL3_ST_CW_CLNT_HELLO_A; 369 else 370 s->state = SSL3_ST_CR_CERT_A; 371 s->init_num = 0; 372 break; 373 374 case SSL3_ST_CR_CERT_A: 375 case SSL3_ST_CR_CERT_B: 376 /* Check if it is anon DH or PSK */ 377 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 378 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 379 { 380 ret=ssl3_get_server_certificate(s); 381 if (ret <= 0) goto end; 382#ifndef OPENSSL_NO_TLSEXT 383 if (s->tlsext_status_expected) 384 s->state=SSL3_ST_CR_CERT_STATUS_A; 385 else 386 s->state=SSL3_ST_CR_KEY_EXCH_A; 387 } 388 else 389 { 390 skip = 1; 391 s->state=SSL3_ST_CR_KEY_EXCH_A; 392 } 393#else 394 } 395 else 396 skip=1; 397 398 s->state=SSL3_ST_CR_KEY_EXCH_A; 399#endif 400 s->init_num=0; 401 break; 402 403 case SSL3_ST_CR_KEY_EXCH_A: 404 case SSL3_ST_CR_KEY_EXCH_B: 405 ret=ssl3_get_key_exchange(s); 406 if (ret <= 0) goto end; 407 s->state=SSL3_ST_CR_CERT_REQ_A; 408 s->init_num=0; 409 410 /* at this point we check that we have the 411 * required stuff from the server */ 412 if (!ssl3_check_cert_and_algorithm(s)) 413 { 414 ret= -1; 415 goto end; 416 } 417 break; 418 419 case SSL3_ST_CR_CERT_REQ_A: 420 case SSL3_ST_CR_CERT_REQ_B: 421 ret=ssl3_get_certificate_request(s); 422 if (ret <= 0) goto end; 423 s->state=SSL3_ST_CR_SRVR_DONE_A; 424 s->init_num=0; 425 break; 426 427 case SSL3_ST_CR_SRVR_DONE_A: 428 case SSL3_ST_CR_SRVR_DONE_B: 429 ret=ssl3_get_server_done(s); 430 if (ret <= 0) goto end; 431 dtls1_stop_timer(s); 432 if (s->s3->tmp.cert_req) 433 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A; 434 else 435 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A; 436 s->init_num=0; 437 438#ifndef OPENSSL_NO_SCTP 439 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 440 state == SSL_ST_RENEGOTIATE) 441 s->state=DTLS1_SCTP_ST_CR_READ_SOCK; 442 else 443#endif 444 s->state=s->s3->tmp.next_state; 445 break; 446 447 case SSL3_ST_CW_CERT_A: 448 case SSL3_ST_CW_CERT_B: 449 case SSL3_ST_CW_CERT_C: 450 case SSL3_ST_CW_CERT_D: 451 dtls1_start_timer(s); 452 ret=dtls1_send_client_certificate(s); 453 if (ret <= 0) goto end; 454 s->state=SSL3_ST_CW_KEY_EXCH_A; 455 s->init_num=0; 456 break; 457 458 case SSL3_ST_CW_KEY_EXCH_A: 459 case SSL3_ST_CW_KEY_EXCH_B: 460 dtls1_start_timer(s); 461 ret=dtls1_send_client_key_exchange(s); 462 if (ret <= 0) goto end; 463 464#ifndef OPENSSL_NO_SCTP 465 /* Add new shared key for SCTP-Auth, 466 * will be ignored if no SCTP used. 467 */ 468 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 469 DTLS1_SCTP_AUTH_LABEL); 470 471 SSL_export_keying_material(s, sctpauthkey, 472 sizeof(sctpauthkey), labelbuffer, 473 sizeof(labelbuffer), NULL, 0, 0); 474 475 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 476 sizeof(sctpauthkey), sctpauthkey); 477#endif 478 479 /* EAY EAY EAY need to check for DH fix cert 480 * sent back */ 481 /* For TLS, cert_req is set to 2, so a cert chain 482 * of nothing is sent, but no verify packet is sent */ 483 if (s->s3->tmp.cert_req == 1) 484 { 485 s->state=SSL3_ST_CW_CERT_VRFY_A; 486 } 487 else 488 { 489#ifndef OPENSSL_NO_SCTP 490 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 491 { 492 s->d1->next_state=SSL3_ST_CW_CHANGE_A; 493 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 494 } 495 else 496#endif 497 s->state=SSL3_ST_CW_CHANGE_A; 498 } 499 500 s->init_num=0; 501 break; 502 503 case SSL3_ST_CW_CERT_VRFY_A: 504 case SSL3_ST_CW_CERT_VRFY_B: 505 dtls1_start_timer(s); 506 ret=dtls1_send_client_verify(s); 507 if (ret <= 0) goto end; 508#ifndef OPENSSL_NO_SCTP 509 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 510 { 511 s->d1->next_state=SSL3_ST_CW_CHANGE_A; 512 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 513 } 514 else 515#endif 516 s->state=SSL3_ST_CW_CHANGE_A; 517 s->init_num=0; 518 break; 519 520 case SSL3_ST_CW_CHANGE_A: 521 case SSL3_ST_CW_CHANGE_B: 522 if (!s->hit) 523 dtls1_start_timer(s); 524 ret=dtls1_send_change_cipher_spec(s, 525 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B); 526 if (ret <= 0) goto end; 527 528 s->state=SSL3_ST_CW_FINISHED_A; 529 s->init_num=0; 530 531 s->session->cipher=s->s3->tmp.new_cipher; 532#ifdef OPENSSL_NO_COMP 533 s->session->compress_meth=0; 534#else 535 if (s->s3->tmp.new_compression == NULL) 536 s->session->compress_meth=0; 537 else 538 s->session->compress_meth= 539 s->s3->tmp.new_compression->id; 540#endif 541 if (!s->method->ssl3_enc->setup_key_block(s)) 542 { 543 ret= -1; 544 goto end; 545 } 546 547 if (!s->method->ssl3_enc->change_cipher_state(s, 548 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 549 { 550 ret= -1; 551 goto end; 552 } 553 554#ifndef OPENSSL_NO_SCTP 555 if (s->hit) 556 { 557 /* Change to new shared key of SCTP-Auth, 558 * will be ignored if no SCTP used. 559 */ 560 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 561 } 562#endif 563 564 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 565 break; 566 567 case SSL3_ST_CW_FINISHED_A: 568 case SSL3_ST_CW_FINISHED_B: 569 if (!s->hit) 570 dtls1_start_timer(s); 571 ret=dtls1_send_finished(s, 572 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B, 573 s->method->ssl3_enc->client_finished_label, 574 s->method->ssl3_enc->client_finished_label_len); 575 if (ret <= 0) goto end; 576 s->state=SSL3_ST_CW_FLUSH; 577 578 /* clear flags */ 579 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER; 580 if (s->hit) 581 { 582 s->s3->tmp.next_state=SSL_ST_OK; 583#ifndef OPENSSL_NO_SCTP 584 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 585 { 586 s->d1->next_state = s->s3->tmp.next_state; 587 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 588 } 589#endif 590 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) 591 { 592 s->state=SSL_ST_OK; 593#ifndef OPENSSL_NO_SCTP 594 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 595 { 596 s->d1->next_state = SSL_ST_OK; 597 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 598 } 599#endif 600 s->s3->flags|=SSL3_FLAGS_POP_BUFFER; 601 s->s3->delay_buf_pop_ret=0; 602 } 603 } 604 else 605 { 606#ifndef OPENSSL_NO_SCTP 607 /* Change to new shared key of SCTP-Auth, 608 * will be ignored if no SCTP used. 609 */ 610 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 611#endif 612 613#ifndef OPENSSL_NO_TLSEXT 614 /* Allow NewSessionTicket if ticket expected */ 615 if (s->tlsext_ticket_expected) 616 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A; 617 else 618#endif 619 620 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A; 621 } 622 s->init_num=0; 623 break; 624 625#ifndef OPENSSL_NO_TLSEXT 626 case SSL3_ST_CR_SESSION_TICKET_A: 627 case SSL3_ST_CR_SESSION_TICKET_B: 628 ret=ssl3_get_new_session_ticket(s); 629 if (ret <= 0) goto end; 630 s->state=SSL3_ST_CR_FINISHED_A; 631 s->init_num=0; 632 break; 633 634 case SSL3_ST_CR_CERT_STATUS_A: 635 case SSL3_ST_CR_CERT_STATUS_B: 636 ret=ssl3_get_cert_status(s); 637 if (ret <= 0) goto end; 638 s->state=SSL3_ST_CR_KEY_EXCH_A; 639 s->init_num=0; 640 break; 641#endif 642 643 case SSL3_ST_CR_FINISHED_A: 644 case SSL3_ST_CR_FINISHED_B: 645 s->d1->change_cipher_spec_ok = 1; 646 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A, 647 SSL3_ST_CR_FINISHED_B); 648 if (ret <= 0) goto end; 649 dtls1_stop_timer(s); 650 651 if (s->hit) 652 s->state=SSL3_ST_CW_CHANGE_A; 653 else 654 s->state=SSL_ST_OK; 655 656#ifndef OPENSSL_NO_SCTP 657 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 658 state == SSL_ST_RENEGOTIATE) 659 { 660 s->d1->next_state=s->state; 661 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 662 } 663#endif 664 665 s->init_num=0; 666 break; 667 668 case SSL3_ST_CW_FLUSH: 669 s->rwstate=SSL_WRITING; 670 if (BIO_flush(s->wbio) <= 0) 671 { 672 /* If the write error was fatal, stop trying */ 673 if (!BIO_should_retry(s->wbio)) 674 { 675 s->rwstate=SSL_NOTHING; 676 s->state=s->s3->tmp.next_state; 677 } 678 679 ret= -1; 680 goto end; 681 } 682 s->rwstate=SSL_NOTHING; 683 s->state=s->s3->tmp.next_state; 684 break; 685 686 case SSL_ST_OK: 687 /* clean a few things up */ 688 ssl3_cleanup_key_block(s); 689 690#if 0 691 if (s->init_buf != NULL) 692 { 693 BUF_MEM_free(s->init_buf); 694 s->init_buf=NULL; 695 } 696#endif 697 698 /* If we are not 'joining' the last two packets, 699 * remove the buffering now */ 700 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 701 ssl_free_wbio_buffer(s); 702 /* else do it later in ssl3_write */ 703 704 s->init_num=0; 705 s->renegotiate=0; 706 s->new_session=0; 707 708 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT); 709 if (s->hit) s->ctx->stats.sess_hit++; 710 711 ret=1; 712 /* s->server=0; */ 713 s->handshake_func=dtls1_connect; 714 s->ctx->stats.sess_connect_good++; 715 716 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 717 718 /* done with handshaking */ 719 s->d1->handshake_read_seq = 0; 720 s->d1->next_handshake_write_seq = 0; 721 goto end; 722 /* break; */ 723 724 default: 725 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE); 726 ret= -1; 727 goto end; 728 /* break; */ 729 } 730 731 /* did we do anything */ 732 if (!s->s3->tmp.reuse_message && !skip) 733 { 734 if (s->debug) 735 { 736 if ((ret=BIO_flush(s->wbio)) <= 0) 737 goto end; 738 } 739 740 if ((cb != NULL) && (s->state != state)) 741 { 742 new_state=s->state; 743 s->state=state; 744 cb(s,SSL_CB_CONNECT_LOOP,1); 745 s->state=new_state; 746 } 747 } 748 skip=0; 749 } 750end: 751 s->in_handshake--; 752 753#ifndef OPENSSL_NO_SCTP 754 /* Notify SCTP BIO socket to leave handshake 755 * mode and allow stream identifier other 756 * than 0. Will be ignored if no SCTP is used. 757 */ 758 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL); 759#endif 760 761 if (buf != NULL) 762 BUF_MEM_free(buf); 763 if (cb != NULL) 764 cb(s,SSL_CB_CONNECT_EXIT,ret); 765 return(ret); 766 } 767 768int dtls1_client_hello(SSL *s) 769 { 770 unsigned char *buf; 771 unsigned char *p,*d; 772 unsigned int i,j; 773 unsigned long l; 774 SSL_COMP *comp; 775 776 buf=(unsigned char *)s->init_buf->data; 777 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) 778 { 779 SSL_SESSION *sess = s->session; 780 if ((s->session == NULL) || 781 (s->session->ssl_version != s->version) || 782#ifdef OPENSSL_NO_TLSEXT 783 !sess->session_id_length || 784#else 785 (!sess->session_id_length && !sess->tlsext_tick) || 786#endif 787 (s->session->not_resumable)) 788 { 789 if (!ssl_get_new_session(s,0)) 790 goto err; 791 } 792 /* else use the pre-loaded session */ 793 794 p=s->s3->client_random; 795 796 /* if client_random is initialized, reuse it, we are 797 * required to use same upon reply to HelloVerify */ 798 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) 799 ; 800 if (i==sizeof(s->s3->client_random)) 801 ssl_fill_hello_random(s, 0, p, 802 sizeof(s->s3->client_random)); 803 804 /* Do the message type and length last */ 805 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 806 807 *(p++)=s->version>>8; 808 *(p++)=s->version&0xff; 809 s->client_version=s->version; 810 811 /* Random stuff */ 812 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 813 p+=SSL3_RANDOM_SIZE; 814 815 /* Session ID */ 816 if (s->new_session) 817 i=0; 818 else 819 i=s->session->session_id_length; 820 *(p++)=i; 821 if (i != 0) 822 { 823 if (i > sizeof s->session->session_id) 824 { 825 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 826 goto err; 827 } 828 memcpy(p,s->session->session_id,i); 829 p+=i; 830 } 831 832 /* cookie stuff */ 833 if ( s->d1->cookie_len > sizeof(s->d1->cookie)) 834 { 835 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 836 goto err; 837 } 838 *(p++) = s->d1->cookie_len; 839 memcpy(p, s->d1->cookie, s->d1->cookie_len); 840 p += s->d1->cookie_len; 841 842 /* Ciphers supported */ 843 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0); 844 if (i == 0) 845 { 846 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 847 goto err; 848 } 849 s2n(i,p); 850 p+=i; 851 852 /* COMPRESSION */ 853 if (s->ctx->comp_methods == NULL) 854 j=0; 855 else 856 j=sk_SSL_COMP_num(s->ctx->comp_methods); 857 *(p++)=1+j; 858 for (i=0; i<j; i++) 859 { 860 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 861 *(p++)=comp->id; 862 } 863 *(p++)=0; /* Add the NULL method */ 864 865#ifndef OPENSSL_NO_TLSEXT 866 /* TLS extensions*/ 867 if (ssl_prepare_clienthello_tlsext(s) <= 0) 868 { 869 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT); 870 goto err; 871 } 872 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 873 { 874 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 875 goto err; 876 } 877#endif 878 879 l=(p-d); 880 d=buf; 881 882 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l); 883 884 s->state=SSL3_ST_CW_CLNT_HELLO_B; 885 /* number of bytes to write */ 886 s->init_num=p-buf; 887 s->init_off=0; 888 889 /* buffer the message to handle re-xmits */ 890 dtls1_buffer_message(s, 0); 891 } 892 893 /* SSL3_ST_CW_CLNT_HELLO_B */ 894 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 895err: 896 return(-1); 897 } 898 899static int dtls1_get_hello_verify(SSL *s) 900 { 901 int n, al, ok = 0; 902 unsigned char *data; 903 unsigned int cookie_len; 904 905 n=s->method->ssl_get_message(s, 906 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 907 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 908 -1, 909 s->max_cert_list, 910 &ok); 911 912 if (!ok) return((int)n); 913 914 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) 915 { 916 s->d1->send_cookie = 0; 917 s->s3->tmp.reuse_message=1; 918 return(1); 919 } 920 921 data = (unsigned char *)s->init_msg; 922 923 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff))) 924 { 925 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION); 926 s->version=(s->version&0xff00)|data[1]; 927 al = SSL_AD_PROTOCOL_VERSION; 928 goto f_err; 929 } 930 data+=2; 931 932 cookie_len = *(data++); 933 if ( cookie_len > sizeof(s->d1->cookie)) 934 { 935 al=SSL_AD_ILLEGAL_PARAMETER; 936 goto f_err; 937 } 938 939 memcpy(s->d1->cookie, data, cookie_len); 940 s->d1->cookie_len = cookie_len; 941 942 s->d1->send_cookie = 1; 943 return 1; 944 945f_err: 946 ssl3_send_alert(s, SSL3_AL_FATAL, al); 947 return -1; 948 } 949 950int dtls1_send_client_key_exchange(SSL *s) 951 { 952 unsigned char *p,*d; 953 int n; 954 unsigned long alg_k; 955#ifndef OPENSSL_NO_RSA 956 unsigned char *q; 957 EVP_PKEY *pkey=NULL; 958#endif 959#ifndef OPENSSL_NO_KRB5 960 KSSL_ERR kssl_err; 961#endif /* OPENSSL_NO_KRB5 */ 962#ifndef OPENSSL_NO_ECDH 963 EC_KEY *clnt_ecdh = NULL; 964 const EC_POINT *srvr_ecpoint = NULL; 965 EVP_PKEY *srvr_pub_pkey = NULL; 966 unsigned char *encodedPoint = NULL; 967 int encoded_pt_len = 0; 968 BN_CTX * bn_ctx = NULL; 969#endif 970 971 if (s->state == SSL3_ST_CW_KEY_EXCH_A) 972 { 973 d=(unsigned char *)s->init_buf->data; 974 p= &(d[DTLS1_HM_HEADER_LENGTH]); 975 976 alg_k=s->s3->tmp.new_cipher->algorithm_mkey; 977 978 /* Fool emacs indentation */ 979 if (0) {} 980#ifndef OPENSSL_NO_RSA 981 else if (alg_k & SSL_kRSA) 982 { 983 RSA *rsa; 984 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 985 986 if (s->session->sess_cert == NULL) 987 { 988 /* We should always have a server certificate with SSL_kRSA. */ 989 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 990 goto err; 991 } 992 993 if (s->session->sess_cert->peer_rsa_tmp != NULL) 994 rsa=s->session->sess_cert->peer_rsa_tmp; 995 else 996 { 997 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 998 if ((pkey == NULL) || 999 (pkey->type != EVP_PKEY_RSA) || 1000 (pkey->pkey.rsa == NULL)) 1001 { 1002 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1003 goto err; 1004 } 1005 rsa=pkey->pkey.rsa; 1006 EVP_PKEY_free(pkey); 1007 } 1008 1009 tmp_buf[0]=s->client_version>>8; 1010 tmp_buf[1]=s->client_version&0xff; 1011 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) 1012 goto err; 1013 1014 s->session->master_key_length=sizeof tmp_buf; 1015 1016 q=p; 1017 /* Fix buf for TLS and [incidentally] DTLS */ 1018 if (s->version > SSL3_VERSION) 1019 p+=2; 1020 n=RSA_public_encrypt(sizeof tmp_buf, 1021 tmp_buf,p,rsa,RSA_PKCS1_PADDING); 1022#ifdef PKCS1_CHECK 1023 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++; 1024 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70; 1025#endif 1026 if (n <= 0) 1027 { 1028 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT); 1029 goto err; 1030 } 1031 1032 /* Fix buf for TLS and [incidentally] DTLS */ 1033 if (s->version > SSL3_VERSION) 1034 { 1035 s2n(n,q); 1036 n+=2; 1037 } 1038 1039 s->session->master_key_length= 1040 s->method->ssl3_enc->generate_master_secret(s, 1041 s->session->master_key, 1042 tmp_buf,sizeof tmp_buf); 1043 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf); 1044 } 1045#endif 1046#ifndef OPENSSL_NO_KRB5 1047 else if (alg_k & SSL_kKRB5) 1048 { 1049 krb5_error_code krb5rc; 1050 KSSL_CTX *kssl_ctx = s->kssl_ctx; 1051 /* krb5_data krb5_ap_req; */ 1052 krb5_data *enc_ticket; 1053 krb5_data authenticator, *authp = NULL; 1054 EVP_CIPHER_CTX ciph_ctx; 1055 const EVP_CIPHER *enc = NULL; 1056 unsigned char iv[EVP_MAX_IV_LENGTH]; 1057 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 1058 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH 1059 + EVP_MAX_IV_LENGTH]; 1060 int padl, outl = sizeof(epms); 1061 1062 EVP_CIPHER_CTX_init(&ciph_ctx); 1063 1064#ifdef KSSL_DEBUG 1065 printf("ssl3_send_client_key_exchange(%lx & %lx)\n", 1066 alg_k, SSL_kKRB5); 1067#endif /* KSSL_DEBUG */ 1068 1069 authp = NULL; 1070#ifdef KRB5SENDAUTH 1071 if (KRB5SENDAUTH) authp = &authenticator; 1072#endif /* KRB5SENDAUTH */ 1073 1074 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, 1075 &kssl_err); 1076 enc = kssl_map_enc(kssl_ctx->enctype); 1077 if (enc == NULL) 1078 goto err; 1079#ifdef KSSL_DEBUG 1080 { 1081 printf("kssl_cget_tkt rtn %d\n", krb5rc); 1082 if (krb5rc && kssl_err.text) 1083 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 1084 } 1085#endif /* KSSL_DEBUG */ 1086 1087 if (krb5rc) 1088 { 1089 ssl3_send_alert(s,SSL3_AL_FATAL, 1090 SSL_AD_HANDSHAKE_FAILURE); 1091 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1092 kssl_err.reason); 1093 goto err; 1094 } 1095 1096 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ 1097 ** in place of RFC 2712 KerberosWrapper, as in: 1098 ** 1099 ** Send ticket (copy to *p, set n = length) 1100 ** n = krb5_ap_req.length; 1101 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 1102 ** if (krb5_ap_req.data) 1103 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 1104 ** 1105 ** Now using real RFC 2712 KerberosWrapper 1106 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) 1107 ** Note: 2712 "opaque" types are here replaced 1108 ** with a 2-byte length followed by the value. 1109 ** Example: 1110 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 1111 ** Where "xx xx" = length bytes. Shown here with 1112 ** optional authenticator omitted. 1113 */ 1114 1115 /* KerberosWrapper.Ticket */ 1116 s2n(enc_ticket->length,p); 1117 memcpy(p, enc_ticket->data, enc_ticket->length); 1118 p+= enc_ticket->length; 1119 n = enc_ticket->length + 2; 1120 1121 /* KerberosWrapper.Authenticator */ 1122 if (authp && authp->length) 1123 { 1124 s2n(authp->length,p); 1125 memcpy(p, authp->data, authp->length); 1126 p+= authp->length; 1127 n+= authp->length + 2; 1128 1129 free(authp->data); 1130 authp->data = NULL; 1131 authp->length = 0; 1132 } 1133 else 1134 { 1135 s2n(0,p);/* null authenticator length */ 1136 n+=2; 1137 } 1138 1139 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0) 1140 goto err; 1141 1142 /* 20010420 VRS. Tried it this way; failed. 1143 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 1144 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 1145 ** kssl_ctx->length); 1146 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 1147 */ 1148 1149 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 1150 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL, 1151 kssl_ctx->key,iv); 1152 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf, 1153 sizeof tmp_buf); 1154 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl); 1155 outl += padl; 1156 if (outl > (int)sizeof epms) 1157 { 1158 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1159 goto err; 1160 } 1161 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 1162 1163 /* KerberosWrapper.EncryptedPreMasterSecret */ 1164 s2n(outl,p); 1165 memcpy(p, epms, outl); 1166 p+=outl; 1167 n+=outl + 2; 1168 1169 s->session->master_key_length= 1170 s->method->ssl3_enc->generate_master_secret(s, 1171 s->session->master_key, 1172 tmp_buf, sizeof tmp_buf); 1173 1174 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 1175 OPENSSL_cleanse(epms, outl); 1176 } 1177#endif 1178#ifndef OPENSSL_NO_DH 1179 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 1180 { 1181 DH *dh_srvr,*dh_clnt; 1182 1183 if (s->session->sess_cert == NULL) 1184 { 1185 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 1186 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE); 1187 goto err; 1188 } 1189 1190 if (s->session->sess_cert->peer_dh_tmp != NULL) 1191 dh_srvr=s->session->sess_cert->peer_dh_tmp; 1192 else 1193 { 1194 /* we get them from the cert */ 1195 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1196 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1197 goto err; 1198 } 1199 1200 /* generate a new random key */ 1201 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL) 1202 { 1203 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1204 goto err; 1205 } 1206 if (!DH_generate_key(dh_clnt)) 1207 { 1208 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1209 goto err; 1210 } 1211 1212 /* use the 'p' output buffer for the DH key, but 1213 * make sure to clear it out afterwards */ 1214 1215 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt); 1216 1217 if (n <= 0) 1218 { 1219 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1220 goto err; 1221 } 1222 1223 /* generate master key from the result */ 1224 s->session->master_key_length= 1225 s->method->ssl3_enc->generate_master_secret(s, 1226 s->session->master_key,p,n); 1227 /* clean up */ 1228 memset(p,0,n); 1229 1230 /* send off the data */ 1231 n=BN_num_bytes(dh_clnt->pub_key); 1232 s2n(n,p); 1233 BN_bn2bin(dh_clnt->pub_key,p); 1234 n+=2; 1235 1236 DH_free(dh_clnt); 1237 1238 /* perhaps clean things up a bit EAY EAY EAY EAY*/ 1239 } 1240#endif 1241#ifndef OPENSSL_NO_ECDH 1242 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) 1243 { 1244 const EC_GROUP *srvr_group = NULL; 1245 EC_KEY *tkey; 1246 int ecdh_clnt_cert = 0; 1247 int field_size = 0; 1248 1249 if (s->session->sess_cert == NULL) 1250 { 1251 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 1252 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE); 1253 goto err; 1254 } 1255 1256 /* Did we send out the client's 1257 * ECDH share for use in premaster 1258 * computation as part of client certificate? 1259 * If so, set ecdh_clnt_cert to 1. 1260 */ 1261 if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 1262 { 1263 /* XXX: For now, we do not support client 1264 * authentication using ECDH certificates. 1265 * To add such support, one needs to add 1266 * code that checks for appropriate 1267 * conditions and sets ecdh_clnt_cert to 1. 1268 * For example, the cert have an ECC 1269 * key on the same curve as the server's 1270 * and the key should be authorized for 1271 * key agreement. 1272 * 1273 * One also needs to add code in ssl3_connect 1274 * to skip sending the certificate verify 1275 * message. 1276 * 1277 * if ((s->cert->key->privatekey != NULL) && 1278 * (s->cert->key->privatekey->type == 1279 * EVP_PKEY_EC) && ...) 1280 * ecdh_clnt_cert = 1; 1281 */ 1282 } 1283 1284 if (s->session->sess_cert->peer_ecdh_tmp != NULL) 1285 { 1286 tkey = s->session->sess_cert->peer_ecdh_tmp; 1287 } 1288 else 1289 { 1290 /* Get the Server Public Key from Cert */ 1291 srvr_pub_pkey = X509_get_pubkey(s->session-> \ 1292 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1293 if ((srvr_pub_pkey == NULL) || 1294 (srvr_pub_pkey->type != EVP_PKEY_EC) || 1295 (srvr_pub_pkey->pkey.ec == NULL)) 1296 { 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 { 1310 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1311 ERR_R_INTERNAL_ERROR); 1312 goto err; 1313 } 1314 1315 if ((clnt_ecdh=EC_KEY_new()) == NULL) 1316 { 1317 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1318 goto err; 1319 } 1320 1321 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) 1322 { 1323 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1324 goto err; 1325 } 1326 if (ecdh_clnt_cert) 1327 { 1328 /* Reuse key info from our certificate 1329 * We only need our private key to perform 1330 * the ECDH computation. 1331 */ 1332 const BIGNUM *priv_key; 1333 tkey = s->cert->key->privatekey->pkey.ec; 1334 priv_key = EC_KEY_get0_private_key(tkey); 1335 if (priv_key == NULL) 1336 { 1337 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1338 goto err; 1339 } 1340 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) 1341 { 1342 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1343 goto err; 1344 } 1345 } 1346 else 1347 { 1348 /* Generate a new ECDH key pair */ 1349 if (!(EC_KEY_generate_key(clnt_ecdh))) 1350 { 1351 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1352 goto err; 1353 } 1354 } 1355 1356 /* use the 'p' output buffer for the ECDH key, but 1357 * make sure to clear it out afterwards 1358 */ 1359 1360 field_size = EC_GROUP_get_degree(srvr_group); 1361 if (field_size <= 0) 1362 { 1363 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1364 ERR_R_ECDH_LIB); 1365 goto err; 1366 } 1367 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL); 1368 if (n <= 0) 1369 { 1370 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1371 ERR_R_ECDH_LIB); 1372 goto err; 1373 } 1374 1375 /* generate master key from the result */ 1376 s->session->master_key_length = s->method->ssl3_enc \ 1377 -> generate_master_secret(s, 1378 s->session->master_key, 1379 p, n); 1380 1381 memset(p, 0, n); /* clean up */ 1382 1383 if (ecdh_clnt_cert) 1384 { 1385 /* Send empty client key exch message */ 1386 n = 0; 1387 } 1388 else 1389 { 1390 /* First check the size of encoding and 1391 * allocate memory accordingly. 1392 */ 1393 encoded_pt_len = 1394 EC_POINT_point2oct(srvr_group, 1395 EC_KEY_get0_public_key(clnt_ecdh), 1396 POINT_CONVERSION_UNCOMPRESSED, 1397 NULL, 0, NULL); 1398 1399 encodedPoint = (unsigned char *) 1400 OPENSSL_malloc(encoded_pt_len * 1401 sizeof(unsigned char)); 1402 bn_ctx = BN_CTX_new(); 1403 if ((encodedPoint == NULL) || 1404 (bn_ctx == NULL)) 1405 { 1406 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,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) OPENSSL_free(encodedPoint); 1428 if (clnt_ecdh != NULL) 1429 EC_KEY_free(clnt_ecdh); 1430 EVP_PKEY_free(srvr_pub_pkey); 1431 } 1432#endif /* !OPENSSL_NO_ECDH */ 1433 1434#ifndef OPENSSL_NO_PSK 1435 else if (alg_k & SSL_kPSK) 1436 { 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 { 1446 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1447 SSL_R_PSK_NO_CLIENT_CB); 1448 goto err; 1449 } 1450 1451 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint, 1452 identity, PSK_MAX_IDENTITY_LEN, 1453 psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1454 if (psk_len > PSK_MAX_PSK_LEN) 1455 { 1456 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1457 ERR_R_INTERNAL_ERROR); 1458 goto psk_err; 1459 } 1460 else if (psk_len == 0) 1461 { 1462 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1463 SSL_R_PSK_IDENTITY_NOT_FOUND); 1464 goto psk_err; 1465 } 1466 1467 /* create PSK pre_master_secret */ 1468 pre_ms_len = 2+psk_len+2+psk_len; 1469 t = psk_or_pre_ms; 1470 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len); 1471 s2n(psk_len, t); 1472 memset(t, 0, psk_len); 1473 t+=psk_len; 1474 s2n(psk_len, t); 1475 1476 if (s->session->psk_identity_hint != NULL) 1477 OPENSSL_free(s->session->psk_identity_hint); 1478 s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint); 1479 if (s->ctx->psk_identity_hint != NULL && 1480 s->session->psk_identity_hint == NULL) 1481 { 1482 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1483 ERR_R_MALLOC_FAILURE); 1484 goto psk_err; 1485 } 1486 1487 if (s->session->psk_identity != NULL) 1488 OPENSSL_free(s->session->psk_identity); 1489 s->session->psk_identity = BUF_strdup(identity); 1490 if (s->session->psk_identity == NULL) 1491 { 1492 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1493 ERR_R_MALLOC_FAILURE); 1494 goto psk_err; 1495 } 1496 1497 s->session->master_key_length = 1498 s->method->ssl3_enc->generate_master_secret(s, 1499 s->session->master_key, 1500 psk_or_pre_ms, pre_ms_len); 1501 n = strlen(identity); 1502 s2n(n, p); 1503 memcpy(p, identity, n); 1504 n+=2; 1505 psk_err = 0; 1506 psk_err: 1507 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN); 1508 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1509 if (psk_err != 0) 1510 { 1511 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1512 goto err; 1513 } 1514 } 1515#endif 1516 else 1517 { 1518 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1519 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1520 goto err; 1521 } 1522 1523 d = dtls1_set_message_header(s, d, 1524 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); 1525 /* 1526 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 1527 l2n3(n,d); 1528 l2n(s->d1->handshake_write_seq,d); 1529 s->d1->handshake_write_seq++; 1530 */ 1531 1532 s->state=SSL3_ST_CW_KEY_EXCH_B; 1533 /* number of bytes to write */ 1534 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1535 s->init_off=0; 1536 1537 /* buffer the message to handle re-xmits */ 1538 dtls1_buffer_message(s, 0); 1539 } 1540 1541 /* SSL3_ST_CW_KEY_EXCH_B */ 1542 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1543err: 1544#ifndef OPENSSL_NO_ECDH 1545 BN_CTX_free(bn_ctx); 1546 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1547 if (clnt_ecdh != NULL) 1548 EC_KEY_free(clnt_ecdh); 1549 EVP_PKEY_free(srvr_pub_pkey); 1550#endif 1551 return(-1); 1552 } 1553 1554int dtls1_send_client_verify(SSL *s) 1555 { 1556 unsigned char *p,*d; 1557 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1558 EVP_PKEY *pkey; 1559#ifndef OPENSSL_NO_RSA 1560 unsigned u=0; 1561#endif 1562 unsigned long n; 1563#if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA) 1564 int j; 1565#endif 1566 1567 if (s->state == SSL3_ST_CW_CERT_VRFY_A) 1568 { 1569 d=(unsigned char *)s->init_buf->data; 1570 p= &(d[DTLS1_HM_HEADER_LENGTH]); 1571 pkey=s->cert->key->privatekey; 1572 1573 s->method->ssl3_enc->cert_verify_mac(s, 1574 NID_sha1, 1575 &(data[MD5_DIGEST_LENGTH])); 1576 1577#ifndef OPENSSL_NO_RSA 1578 if (pkey->type == EVP_PKEY_RSA) 1579 { 1580 s->method->ssl3_enc->cert_verify_mac(s, 1581 NID_md5, 1582 &(data[0])); 1583 if (RSA_sign(NID_md5_sha1, data, 1584 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, 1585 &(p[2]), &u, pkey->pkey.rsa) <= 0 ) 1586 { 1587 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB); 1588 goto err; 1589 } 1590 s2n(u,p); 1591 n=u+2; 1592 } 1593 else 1594#endif 1595#ifndef OPENSSL_NO_DSA 1596 if (pkey->type == EVP_PKEY_DSA) 1597 { 1598 if (!DSA_sign(pkey->save_type, 1599 &(data[MD5_DIGEST_LENGTH]), 1600 SHA_DIGEST_LENGTH,&(p[2]), 1601 (unsigned int *)&j,pkey->pkey.dsa)) 1602 { 1603 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB); 1604 goto err; 1605 } 1606 s2n(j,p); 1607 n=j+2; 1608 } 1609 else 1610#endif 1611#ifndef OPENSSL_NO_ECDSA 1612 if (pkey->type == EVP_PKEY_EC) 1613 { 1614 if (!ECDSA_sign(pkey->save_type, 1615 &(data[MD5_DIGEST_LENGTH]), 1616 SHA_DIGEST_LENGTH,&(p[2]), 1617 (unsigned int *)&j,pkey->pkey.ec)) 1618 { 1619 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, 1620 ERR_R_ECDSA_LIB); 1621 goto err; 1622 } 1623 s2n(j,p); 1624 n=j+2; 1625 } 1626 else 1627#endif 1628 { 1629 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR); 1630 goto err; 1631 } 1632 1633 d = dtls1_set_message_header(s, d, 1634 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ; 1635 1636 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH; 1637 s->init_off=0; 1638 1639 /* buffer the message to handle re-xmits */ 1640 dtls1_buffer_message(s, 0); 1641 1642 s->state = SSL3_ST_CW_CERT_VRFY_B; 1643 } 1644 1645 /* s->state = SSL3_ST_CW_CERT_VRFY_B */ 1646 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1647err: 1648 return(-1); 1649 } 1650 1651int dtls1_send_client_certificate(SSL *s) 1652 { 1653 X509 *x509=NULL; 1654 EVP_PKEY *pkey=NULL; 1655 int i; 1656 unsigned long l; 1657 1658 if (s->state == SSL3_ST_CW_CERT_A) 1659 { 1660 if ((s->cert == NULL) || 1661 (s->cert->key->x509 == NULL) || 1662 (s->cert->key->privatekey == NULL)) 1663 s->state=SSL3_ST_CW_CERT_B; 1664 else 1665 s->state=SSL3_ST_CW_CERT_C; 1666 } 1667 1668 /* We need to get a client cert */ 1669 if (s->state == SSL3_ST_CW_CERT_B) 1670 { 1671 /* If we get an error, we need to 1672 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 1673 * We then get retied later */ 1674 i=0; 1675 i = ssl_do_client_cert_cb(s, &x509, &pkey); 1676 if (i < 0) 1677 { 1678 s->rwstate=SSL_X509_LOOKUP; 1679 return(-1); 1680 } 1681 s->rwstate=SSL_NOTHING; 1682 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) 1683 { 1684 s->state=SSL3_ST_CW_CERT_B; 1685 if ( !SSL_use_certificate(s,x509) || 1686 !SSL_use_PrivateKey(s,pkey)) 1687 i=0; 1688 } 1689 else if (i == 1) 1690 { 1691 i=0; 1692 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 1693 } 1694 1695 if (x509 != NULL) X509_free(x509); 1696 if (pkey != NULL) EVP_PKEY_free(pkey); 1697 if (i == 0) 1698 { 1699 if (s->version == SSL3_VERSION) 1700 { 1701 s->s3->tmp.cert_req=0; 1702 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE); 1703 return(1); 1704 } 1705 else 1706 { 1707 s->s3->tmp.cert_req=2; 1708 } 1709 } 1710 1711 /* Ok, we have a cert */ 1712 s->state=SSL3_ST_CW_CERT_C; 1713 } 1714 1715 if (s->state == SSL3_ST_CW_CERT_C) 1716 { 1717 s->state=SSL3_ST_CW_CERT_D; 1718 l=dtls1_output_cert_chain(s, 1719 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509); 1720 if (!l) 1721 { 1722 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); 1723 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR); 1724 return 0; 1725 } 1726 s->init_num=(int)l; 1727 s->init_off=0; 1728 1729 /* set header called by dtls1_output_cert_chain() */ 1730 1731 /* buffer the message to handle re-xmits */ 1732 dtls1_buffer_message(s, 0); 1733 } 1734 /* SSL3_ST_CW_CERT_D */ 1735 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1736 } 1737