d1_srvr.c revision 277195
1/* ssl/d1_srvr.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#include <openssl/buffer.h> 119#include <openssl/rand.h> 120#include <openssl/objects.h> 121#include <openssl/evp.h> 122#include <openssl/x509.h> 123#include <openssl/md5.h> 124#include <openssl/bn.h> 125#ifndef OPENSSL_NO_DH 126#include <openssl/dh.h> 127#endif 128 129static const SSL_METHOD *dtls1_get_server_method(int ver); 130static int dtls1_send_hello_verify_request(SSL *s); 131 132static const SSL_METHOD *dtls1_get_server_method(int ver) 133 { 134 if (ver == DTLS1_VERSION) 135 return(DTLSv1_server_method()); 136 else 137 return(NULL); 138 } 139 140IMPLEMENT_dtls1_meth_func(DTLSv1_server_method, 141 dtls1_accept, 142 ssl_undefined_function, 143 dtls1_get_server_method) 144 145int dtls1_accept(SSL *s) 146 { 147 BUF_MEM *buf; 148 unsigned long Time=(unsigned long)time(NULL); 149 void (*cb)(const SSL *ssl,int type,int val)=NULL; 150 unsigned long alg_k; 151 int ret= -1; 152 int new_state,state,skip=0; 153 int listen; 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 listen = s->d1->listen; 169 170 /* init things to blank */ 171 s->in_handshake++; 172 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 173 174 s->d1->listen = listen; 175#ifndef OPENSSL_NO_SCTP 176 /* Notify SCTP BIO socket to enter handshake 177 * mode and prevent stream identifier other 178 * than 0. Will be ignored if no SCTP is used. 179 */ 180 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL); 181#endif 182 183 if (s->cert == NULL) 184 { 185 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET); 186 return(-1); 187 } 188 189#ifndef OPENSSL_NO_HEARTBEATS 190 /* If we're awaiting a HeartbeatResponse, pretend we 191 * already got and don't await it anymore, because 192 * Heartbeats don't make sense during handshakes anyway. 193 */ 194 if (s->tlsext_hb_pending) 195 { 196 dtls1_stop_timer(s); 197 s->tlsext_hb_pending = 0; 198 s->tlsext_hb_seq++; 199 } 200#endif 201 202 for (;;) 203 { 204 state=s->state; 205 206 switch (s->state) 207 { 208 case SSL_ST_RENEGOTIATE: 209 s->renegotiate=1; 210 /* s->state=SSL_ST_ACCEPT; */ 211 212 case SSL_ST_BEFORE: 213 case SSL_ST_ACCEPT: 214 case SSL_ST_BEFORE|SSL_ST_ACCEPT: 215 case SSL_ST_OK|SSL_ST_ACCEPT: 216 217 s->server=1; 218 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 219 220 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) 221 { 222 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR); 223 return -1; 224 } 225 s->type=SSL_ST_ACCEPT; 226 227 if (s->init_buf == NULL) 228 { 229 if ((buf=BUF_MEM_new()) == NULL) 230 { 231 ret= -1; 232 goto end; 233 } 234 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 235 { 236 ret= -1; 237 goto end; 238 } 239 s->init_buf=buf; 240 } 241 242 if (!ssl3_setup_buffers(s)) 243 { 244 ret= -1; 245 goto end; 246 } 247 248 s->init_num=0; 249 250 if (s->state != SSL_ST_RENEGOTIATE) 251 { 252 /* Ok, we now need to push on a buffering BIO so that 253 * the output is sent in a way that TCP likes :-) 254 * ...but not with SCTP :-) 255 */ 256#ifndef OPENSSL_NO_SCTP 257 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) 258#endif 259 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; } 260 261 ssl3_init_finished_mac(s); 262 s->state=SSL3_ST_SR_CLNT_HELLO_A; 263 s->ctx->stats.sess_accept++; 264 } 265 else 266 { 267 /* s->state == SSL_ST_RENEGOTIATE, 268 * we will just send a HelloRequest */ 269 s->ctx->stats.sess_accept_renegotiate++; 270 s->state=SSL3_ST_SW_HELLO_REQ_A; 271 } 272 273 break; 274 275 case SSL3_ST_SW_HELLO_REQ_A: 276 case SSL3_ST_SW_HELLO_REQ_B: 277 278 s->shutdown=0; 279 dtls1_clear_record_buffer(s); 280 dtls1_start_timer(s); 281 ret=dtls1_send_hello_request(s); 282 if (ret <= 0) goto end; 283 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A; 284 s->state=SSL3_ST_SW_FLUSH; 285 s->init_num=0; 286 287 ssl3_init_finished_mac(s); 288 break; 289 290 case SSL3_ST_SW_HELLO_REQ_C: 291 s->state=SSL_ST_OK; 292 break; 293 294 case SSL3_ST_SR_CLNT_HELLO_A: 295 case SSL3_ST_SR_CLNT_HELLO_B: 296 case SSL3_ST_SR_CLNT_HELLO_C: 297 298 s->shutdown=0; 299 ret=ssl3_get_client_hello(s); 300 if (ret <= 0) goto end; 301 dtls1_stop_timer(s); 302 303 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 304 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 305 else 306 s->state = SSL3_ST_SW_SRVR_HELLO_A; 307 308 s->init_num=0; 309 310 /* Reflect ClientHello sequence to remain stateless while listening */ 311 if (listen) 312 { 313 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence)); 314 } 315 316 /* If we're just listening, stop here */ 317 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) 318 { 319 ret = 2; 320 s->d1->listen = 0; 321 /* Set expected sequence numbers 322 * to continue the handshake. 323 */ 324 s->d1->handshake_read_seq = 2; 325 s->d1->handshake_write_seq = 1; 326 s->d1->next_handshake_write_seq = 1; 327 goto end; 328 } 329 330 break; 331 332 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 333 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 334 335 ret = dtls1_send_hello_verify_request(s); 336 if ( ret <= 0) goto end; 337 s->state=SSL3_ST_SW_FLUSH; 338 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A; 339 340 /* HelloVerifyRequest resets Finished MAC */ 341 if (s->version != DTLS1_BAD_VER) 342 ssl3_init_finished_mac(s); 343 break; 344 345#ifndef OPENSSL_NO_SCTP 346 case DTLS1_SCTP_ST_SR_READ_SOCK: 347 348 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) 349 { 350 s->s3->in_read_app_data=2; 351 s->rwstate=SSL_READING; 352 BIO_clear_retry_flags(SSL_get_rbio(s)); 353 BIO_set_retry_read(SSL_get_rbio(s)); 354 ret = -1; 355 goto end; 356 } 357 358 s->state=SSL3_ST_SR_FINISHED_A; 359 break; 360 361 case DTLS1_SCTP_ST_SW_WRITE_SOCK: 362 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 363 if (ret < 0) goto end; 364 365 if (ret == 0) 366 { 367 if (s->d1->next_state != SSL_ST_OK) 368 { 369 s->s3->in_read_app_data=2; 370 s->rwstate=SSL_READING; 371 BIO_clear_retry_flags(SSL_get_rbio(s)); 372 BIO_set_retry_read(SSL_get_rbio(s)); 373 ret = -1; 374 goto end; 375 } 376 } 377 378 s->state=s->d1->next_state; 379 break; 380#endif 381 382 case SSL3_ST_SW_SRVR_HELLO_A: 383 case SSL3_ST_SW_SRVR_HELLO_B: 384 s->renegotiate = 2; 385 dtls1_start_timer(s); 386 ret=dtls1_send_server_hello(s); 387 if (ret <= 0) goto end; 388 389 if (s->hit) 390 { 391#ifndef OPENSSL_NO_SCTP 392 /* Add new shared key for SCTP-Auth, 393 * will be ignored if no SCTP used. 394 */ 395 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 396 DTLS1_SCTP_AUTH_LABEL); 397 398 SSL_export_keying_material(s, sctpauthkey, 399 sizeof(sctpauthkey), labelbuffer, 400 sizeof(labelbuffer), NULL, 0, 0); 401 402 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 403 sizeof(sctpauthkey), sctpauthkey); 404#endif 405#ifndef OPENSSL_NO_TLSEXT 406 if (s->tlsext_ticket_expected) 407 s->state=SSL3_ST_SW_SESSION_TICKET_A; 408 else 409 s->state=SSL3_ST_SW_CHANGE_A; 410#else 411 s->state=SSL3_ST_SW_CHANGE_A; 412#endif 413 } 414 else 415 s->state=SSL3_ST_SW_CERT_A; 416 s->init_num=0; 417 break; 418 419 case SSL3_ST_SW_CERT_A: 420 case SSL3_ST_SW_CERT_B: 421 /* Check if it is anon DH or normal PSK */ 422 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 423 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 424 { 425 dtls1_start_timer(s); 426 ret=dtls1_send_server_certificate(s); 427 if (ret <= 0) goto end; 428#ifndef OPENSSL_NO_TLSEXT 429 if (s->tlsext_status_expected) 430 s->state=SSL3_ST_SW_CERT_STATUS_A; 431 else 432 s->state=SSL3_ST_SW_KEY_EXCH_A; 433 } 434 else 435 { 436 skip = 1; 437 s->state=SSL3_ST_SW_KEY_EXCH_A; 438 } 439#else 440 } 441 else 442 skip=1; 443 444 s->state=SSL3_ST_SW_KEY_EXCH_A; 445#endif 446 s->init_num=0; 447 break; 448 449 case SSL3_ST_SW_KEY_EXCH_A: 450 case SSL3_ST_SW_KEY_EXCH_B: 451 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 452 453 /* 454 * clear this, it may get reset by 455 * send_server_key_exchange 456 */ 457 s->s3->tmp.use_rsa_tmp=0; 458 459 /* only send if a DH key exchange or 460 * RSA but we have a sign only certificate */ 461 if (0 462 /* PSK: send ServerKeyExchange if PSK identity 463 * hint if provided */ 464#ifndef OPENSSL_NO_PSK 465 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint) 466#endif 467 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 468 || (alg_k & SSL_kEECDH) 469 || ((alg_k & SSL_kRSA) 470 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL 471 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) 472 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) 473 ) 474 ) 475 ) 476 ) 477 { 478 dtls1_start_timer(s); 479 ret=dtls1_send_server_key_exchange(s); 480 if (ret <= 0) goto end; 481 } 482 else 483 skip=1; 484 485 s->state=SSL3_ST_SW_CERT_REQ_A; 486 s->init_num=0; 487 break; 488 489 case SSL3_ST_SW_CERT_REQ_A: 490 case SSL3_ST_SW_CERT_REQ_B: 491 if (/* don't request cert unless asked for it: */ 492 !(s->verify_mode & SSL_VERIFY_PEER) || 493 /* if SSL_VERIFY_CLIENT_ONCE is set, 494 * don't request cert during re-negotiation: */ 495 ((s->session->peer != NULL) && 496 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 497 /* never request cert in anonymous ciphersuites 498 * (see section "Certificate request" in SSL 3 drafts 499 * and in RFC 2246): */ 500 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 501 /* ... except when the application insists on verification 502 * (against the specs, but s3_clnt.c accepts this for SSL 3) */ 503 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || 504 /* never request cert in Kerberos ciphersuites */ 505 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) 506 /* With normal PSK Certificates and 507 * Certificate Requests are omitted */ 508 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 509 { 510 /* no cert request */ 511 skip=1; 512 s->s3->tmp.cert_request=0; 513 s->state=SSL3_ST_SW_SRVR_DONE_A; 514#ifndef OPENSSL_NO_SCTP 515 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 516 { 517 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 518 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 519 } 520#endif 521 } 522 else 523 { 524 s->s3->tmp.cert_request=1; 525 dtls1_start_timer(s); 526 ret=dtls1_send_certificate_request(s); 527 if (ret <= 0) goto end; 528#ifndef NETSCAPE_HANG_BUG 529 s->state=SSL3_ST_SW_SRVR_DONE_A; 530#ifndef OPENSSL_NO_SCTP 531 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 532 { 533 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 534 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 535 } 536#endif 537#else 538 s->state=SSL3_ST_SW_FLUSH; 539 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 540#ifndef OPENSSL_NO_SCTP 541 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 542 { 543 s->d1->next_state = s->s3->tmp.next_state; 544 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK; 545 } 546#endif 547#endif 548 s->init_num=0; 549 } 550 break; 551 552 case SSL3_ST_SW_SRVR_DONE_A: 553 case SSL3_ST_SW_SRVR_DONE_B: 554 dtls1_start_timer(s); 555 ret=dtls1_send_server_done(s); 556 if (ret <= 0) goto end; 557 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 558 s->state=SSL3_ST_SW_FLUSH; 559 s->init_num=0; 560 break; 561 562 case SSL3_ST_SW_FLUSH: 563 s->rwstate=SSL_WRITING; 564 if (BIO_flush(s->wbio) <= 0) 565 { 566 /* If the write error was fatal, stop trying */ 567 if (!BIO_should_retry(s->wbio)) 568 { 569 s->rwstate=SSL_NOTHING; 570 s->state=s->s3->tmp.next_state; 571 } 572 573 ret= -1; 574 goto end; 575 } 576 s->rwstate=SSL_NOTHING; 577 s->state=s->s3->tmp.next_state; 578 break; 579 580 case SSL3_ST_SR_CERT_A: 581 case SSL3_ST_SR_CERT_B: 582 /* Check for second client hello (MS SGC) */ 583 ret = ssl3_check_client_hello(s); 584 if (ret <= 0) 585 goto end; 586 if (ret == 2) 587 { 588 dtls1_stop_timer(s); 589 s->state = SSL3_ST_SR_CLNT_HELLO_C; 590 } 591 else { 592 if (s->s3->tmp.cert_request) 593 { 594 ret=ssl3_get_client_certificate(s); 595 if (ret <= 0) goto end; 596 } 597 s->init_num=0; 598 s->state=SSL3_ST_SR_KEY_EXCH_A; 599 } 600 break; 601 602 case SSL3_ST_SR_KEY_EXCH_A: 603 case SSL3_ST_SR_KEY_EXCH_B: 604 ret=ssl3_get_client_key_exchange(s); 605 if (ret <= 0) goto end; 606#ifndef OPENSSL_NO_SCTP 607 /* Add new shared key for SCTP-Auth, 608 * will be ignored if no SCTP used. 609 */ 610 snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 611 DTLS1_SCTP_AUTH_LABEL); 612 613 SSL_export_keying_material(s, sctpauthkey, 614 sizeof(sctpauthkey), labelbuffer, 615 sizeof(labelbuffer), NULL, 0, 0); 616 617 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 618 sizeof(sctpauthkey), sctpauthkey); 619#endif 620 621 s->state=SSL3_ST_SR_CERT_VRFY_A; 622 s->init_num=0; 623 624 if (ret == 2) 625 { 626 /* For the ECDH ciphersuites when 627 * the client sends its ECDH pub key in 628 * a certificate, the CertificateVerify 629 * message is not sent. 630 */ 631 s->state=SSL3_ST_SR_FINISHED_A; 632 s->init_num = 0; 633 } 634 else 635 { 636 s->state=SSL3_ST_SR_CERT_VRFY_A; 637 s->init_num=0; 638 639 /* We need to get hashes here so if there is 640 * a client cert, it can be verified */ 641 s->method->ssl3_enc->cert_verify_mac(s, 642 NID_md5, 643 &(s->s3->tmp.cert_verify_md[0])); 644 s->method->ssl3_enc->cert_verify_mac(s, 645 NID_sha1, 646 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH])); 647 } 648 break; 649 650 case SSL3_ST_SR_CERT_VRFY_A: 651 case SSL3_ST_SR_CERT_VRFY_B: 652 653 s->d1->change_cipher_spec_ok = 1; 654 /* we should decide if we expected this one */ 655 ret=ssl3_get_cert_verify(s); 656 if (ret <= 0) goto end; 657#ifndef OPENSSL_NO_SCTP 658 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 659 state == SSL_ST_RENEGOTIATE) 660 s->state=DTLS1_SCTP_ST_SR_READ_SOCK; 661 else 662#endif 663 s->state=SSL3_ST_SR_FINISHED_A; 664 s->init_num=0; 665 break; 666 667 case SSL3_ST_SR_FINISHED_A: 668 case SSL3_ST_SR_FINISHED_B: 669 s->d1->change_cipher_spec_ok = 1; 670 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A, 671 SSL3_ST_SR_FINISHED_B); 672 if (ret <= 0) goto end; 673 dtls1_stop_timer(s); 674 if (s->hit) 675 s->state=SSL_ST_OK; 676#ifndef OPENSSL_NO_TLSEXT 677 else if (s->tlsext_ticket_expected) 678 s->state=SSL3_ST_SW_SESSION_TICKET_A; 679#endif 680 else 681 s->state=SSL3_ST_SW_CHANGE_A; 682 s->init_num=0; 683 break; 684 685#ifndef OPENSSL_NO_TLSEXT 686 case SSL3_ST_SW_SESSION_TICKET_A: 687 case SSL3_ST_SW_SESSION_TICKET_B: 688 ret=dtls1_send_newsession_ticket(s); 689 if (ret <= 0) goto end; 690 s->state=SSL3_ST_SW_CHANGE_A; 691 s->init_num=0; 692 break; 693 694 case SSL3_ST_SW_CERT_STATUS_A: 695 case SSL3_ST_SW_CERT_STATUS_B: 696 ret=ssl3_send_cert_status(s); 697 if (ret <= 0) goto end; 698 s->state=SSL3_ST_SW_KEY_EXCH_A; 699 s->init_num=0; 700 break; 701 702#endif 703 704 case SSL3_ST_SW_CHANGE_A: 705 case SSL3_ST_SW_CHANGE_B: 706 707 s->session->cipher=s->s3->tmp.new_cipher; 708 if (!s->method->ssl3_enc->setup_key_block(s)) 709 { ret= -1; goto end; } 710 711 ret=dtls1_send_change_cipher_spec(s, 712 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B); 713 714 if (ret <= 0) goto end; 715 716#ifndef OPENSSL_NO_SCTP 717 if (!s->hit) 718 { 719 /* Change to new shared key of SCTP-Auth, 720 * will be ignored if no SCTP used. 721 */ 722 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 723 } 724#endif 725 726 s->state=SSL3_ST_SW_FINISHED_A; 727 s->init_num=0; 728 729 if (!s->method->ssl3_enc->change_cipher_state(s, 730 SSL3_CHANGE_CIPHER_SERVER_WRITE)) 731 { 732 ret= -1; 733 goto end; 734 } 735 736 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 737 break; 738 739 case SSL3_ST_SW_FINISHED_A: 740 case SSL3_ST_SW_FINISHED_B: 741 ret=dtls1_send_finished(s, 742 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B, 743 s->method->ssl3_enc->server_finished_label, 744 s->method->ssl3_enc->server_finished_label_len); 745 if (ret <= 0) goto end; 746 s->state=SSL3_ST_SW_FLUSH; 747 if (s->hit) 748 { 749 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A; 750 751#ifndef OPENSSL_NO_SCTP 752 /* Change to new shared key of SCTP-Auth, 753 * will be ignored if no SCTP used. 754 */ 755 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 756#endif 757 } 758 else 759 { 760 s->s3->tmp.next_state=SSL_ST_OK; 761#ifndef OPENSSL_NO_SCTP 762 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 763 { 764 s->d1->next_state = s->s3->tmp.next_state; 765 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK; 766 } 767#endif 768 } 769 s->init_num=0; 770 break; 771 772 case SSL_ST_OK: 773 /* clean a few things up */ 774 ssl3_cleanup_key_block(s); 775 776#if 0 777 BUF_MEM_free(s->init_buf); 778 s->init_buf=NULL; 779#endif 780 781 /* remove buffering on output */ 782 ssl_free_wbio_buffer(s); 783 784 s->init_num=0; 785 786 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */ 787 { 788 s->renegotiate=0; 789 s->new_session=0; 790 791 ssl_update_cache(s,SSL_SESS_CACHE_SERVER); 792 793 s->ctx->stats.sess_accept_good++; 794 /* s->server=1; */ 795 s->handshake_func=dtls1_accept; 796 797 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 798 } 799 800 ret = 1; 801 802 /* done handshaking, next message is client hello */ 803 s->d1->handshake_read_seq = 0; 804 /* next message is server hello */ 805 s->d1->handshake_write_seq = 0; 806 s->d1->next_handshake_write_seq = 0; 807 goto end; 808 /* break; */ 809 810 default: 811 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE); 812 ret= -1; 813 goto end; 814 /* break; */ 815 } 816 817 if (!s->s3->tmp.reuse_message && !skip) 818 { 819 if (s->debug) 820 { 821 if ((ret=BIO_flush(s->wbio)) <= 0) 822 goto end; 823 } 824 825 826 if ((cb != NULL) && (s->state != state)) 827 { 828 new_state=s->state; 829 s->state=state; 830 cb(s,SSL_CB_ACCEPT_LOOP,1); 831 s->state=new_state; 832 } 833 } 834 skip=0; 835 } 836end: 837 /* BIO_flush(s->wbio); */ 838 839 s->in_handshake--; 840#ifndef OPENSSL_NO_SCTP 841 /* Notify SCTP BIO socket to leave handshake 842 * mode and prevent stream identifier other 843 * than 0. Will be ignored if no SCTP is used. 844 */ 845 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL); 846#endif 847 848 if (cb != NULL) 849 cb(s,SSL_CB_ACCEPT_EXIT,ret); 850 return(ret); 851 } 852 853int dtls1_send_hello_request(SSL *s) 854 { 855 unsigned char *p; 856 857 if (s->state == SSL3_ST_SW_HELLO_REQ_A) 858 { 859 p=(unsigned char *)s->init_buf->data; 860 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0); 861 862 s->state=SSL3_ST_SW_HELLO_REQ_B; 863 /* number of bytes to write */ 864 s->init_num=DTLS1_HM_HEADER_LENGTH; 865 s->init_off=0; 866 867 /* no need to buffer this message, since there are no retransmit 868 * requests for it */ 869 } 870 871 /* SSL3_ST_SW_HELLO_REQ_B */ 872 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 873 } 874 875int dtls1_send_hello_verify_request(SSL *s) 876 { 877 unsigned int msg_len; 878 unsigned char *msg, *buf, *p; 879 880 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) 881 { 882 buf = (unsigned char *)s->init_buf->data; 883 884 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 885 *(p++) = s->version >> 8; 886 *(p++) = s->version & 0xFF; 887 888 if (s->ctx->app_gen_cookie_cb == NULL || 889 s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 890 &(s->d1->cookie_len)) == 0) 891 { 892 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR); 893 return 0; 894 } 895 896 *(p++) = (unsigned char) s->d1->cookie_len; 897 memcpy(p, s->d1->cookie, s->d1->cookie_len); 898 p += s->d1->cookie_len; 899 msg_len = p - msg; 900 901 dtls1_set_message_header(s, buf, 902 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len); 903 904 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 905 /* number of bytes to write */ 906 s->init_num=p-buf; 907 s->init_off=0; 908 } 909 910 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 911 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 912 } 913 914int dtls1_send_server_hello(SSL *s) 915 { 916 unsigned char *buf; 917 unsigned char *p,*d; 918 int i; 919 unsigned int sl; 920 unsigned long l; 921 922 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) 923 { 924 buf=(unsigned char *)s->init_buf->data; 925 p=s->s3->server_random; 926 ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE); 927 /* Do the message type and length last */ 928 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 929 930 *(p++)=s->version>>8; 931 *(p++)=s->version&0xff; 932 933 /* Random stuff */ 934 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 935 p+=SSL3_RANDOM_SIZE; 936 937 /* now in theory we have 3 options to sending back the 938 * session id. If it is a re-use, we send back the 939 * old session-id, if it is a new session, we send 940 * back the new session-id or we send back a 0 length 941 * session-id if we want it to be single use. 942 * Currently I will not implement the '0' length session-id 943 * 12-Jan-98 - I'll now support the '0' length stuff. 944 */ 945 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) 946 s->session->session_id_length=0; 947 948 sl=s->session->session_id_length; 949 if (sl > sizeof s->session->session_id) 950 { 951 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 952 return -1; 953 } 954 *(p++)=sl; 955 memcpy(p,s->session->session_id,sl); 956 p+=sl; 957 958 /* put the cipher */ 959 if (s->s3->tmp.new_cipher == NULL) 960 return -1; 961 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p); 962 p+=i; 963 964 /* put the compression method */ 965#ifdef OPENSSL_NO_COMP 966 *(p++)=0; 967#else 968 if (s->s3->tmp.new_compression == NULL) 969 *(p++)=0; 970 else 971 *(p++)=s->s3->tmp.new_compression->id; 972#endif 973 974#ifndef OPENSSL_NO_TLSEXT 975 if (ssl_prepare_serverhello_tlsext(s) <= 0) 976 { 977 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT); 978 return -1; 979 } 980 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 981 { 982 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR); 983 return -1; 984 } 985#endif 986 987 /* do the header */ 988 l=(p-d); 989 d=buf; 990 991 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l); 992 993 s->state=SSL3_ST_SW_SRVR_HELLO_B; 994 /* number of bytes to write */ 995 s->init_num=p-buf; 996 s->init_off=0; 997 998 /* buffer the message to handle re-xmits */ 999 dtls1_buffer_message(s, 0); 1000 } 1001 1002 /* SSL3_ST_SW_SRVR_HELLO_B */ 1003 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1004 } 1005 1006int dtls1_send_server_done(SSL *s) 1007 { 1008 unsigned char *p; 1009 1010 if (s->state == SSL3_ST_SW_SRVR_DONE_A) 1011 { 1012 p=(unsigned char *)s->init_buf->data; 1013 1014 /* do the header */ 1015 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0); 1016 1017 s->state=SSL3_ST_SW_SRVR_DONE_B; 1018 /* number of bytes to write */ 1019 s->init_num=DTLS1_HM_HEADER_LENGTH; 1020 s->init_off=0; 1021 1022 /* buffer the message to handle re-xmits */ 1023 dtls1_buffer_message(s, 0); 1024 } 1025 1026 /* SSL3_ST_SW_SRVR_DONE_B */ 1027 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1028 } 1029 1030int dtls1_send_server_key_exchange(SSL *s) 1031 { 1032#ifndef OPENSSL_NO_RSA 1033 unsigned char *q; 1034 int j,num; 1035 RSA *rsa; 1036 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1037 unsigned int u; 1038#endif 1039#ifndef OPENSSL_NO_DH 1040 DH *dh=NULL,*dhp; 1041#endif 1042#ifndef OPENSSL_NO_ECDH 1043 EC_KEY *ecdh=NULL, *ecdhp; 1044 unsigned char *encodedPoint = NULL; 1045 int encodedlen = 0; 1046 int curve_id = 0; 1047 BN_CTX *bn_ctx = NULL; 1048#endif 1049 EVP_PKEY *pkey; 1050 unsigned char *p,*d; 1051 int al,i; 1052 unsigned long type; 1053 int n; 1054 CERT *cert; 1055 BIGNUM *r[4]; 1056 int nr[4],kn; 1057 BUF_MEM *buf; 1058 EVP_MD_CTX md_ctx; 1059 1060 EVP_MD_CTX_init(&md_ctx); 1061 if (s->state == SSL3_ST_SW_KEY_EXCH_A) 1062 { 1063 type=s->s3->tmp.new_cipher->algorithm_mkey; 1064 cert=s->cert; 1065 1066 buf=s->init_buf; 1067 1068 r[0]=r[1]=r[2]=r[3]=NULL; 1069 n=0; 1070#ifndef OPENSSL_NO_RSA 1071 if (type & SSL_kRSA) 1072 { 1073 rsa=cert->rsa_tmp; 1074 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) 1075 { 1076 rsa=s->cert->rsa_tmp_cb(s, 1077 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1078 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1079 if(rsa == NULL) 1080 { 1081 al=SSL_AD_HANDSHAKE_FAILURE; 1082 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY); 1083 goto f_err; 1084 } 1085 RSA_up_ref(rsa); 1086 cert->rsa_tmp=rsa; 1087 } 1088 if (rsa == NULL) 1089 { 1090 al=SSL_AD_HANDSHAKE_FAILURE; 1091 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY); 1092 goto f_err; 1093 } 1094 r[0]=rsa->n; 1095 r[1]=rsa->e; 1096 s->s3->tmp.use_rsa_tmp=1; 1097 } 1098 else 1099#endif 1100#ifndef OPENSSL_NO_DH 1101 if (type & SSL_kEDH) 1102 { 1103 dhp=cert->dh_tmp; 1104 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) 1105 dhp=s->cert->dh_tmp_cb(s, 1106 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1107 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1108 if (dhp == NULL) 1109 { 1110 al=SSL_AD_HANDSHAKE_FAILURE; 1111 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY); 1112 goto f_err; 1113 } 1114 1115 if (s->s3->tmp.dh != NULL) 1116 { 1117 DH_free(dh); 1118 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1119 goto err; 1120 } 1121 1122 if ((dh=DHparams_dup(dhp)) == NULL) 1123 { 1124 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 1125 goto err; 1126 } 1127 1128 s->s3->tmp.dh=dh; 1129 if ((dhp->pub_key == NULL || 1130 dhp->priv_key == NULL || 1131 (s->options & SSL_OP_SINGLE_DH_USE))) 1132 { 1133 if(!DH_generate_key(dh)) 1134 { 1135 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1136 ERR_R_DH_LIB); 1137 goto err; 1138 } 1139 } 1140 else 1141 { 1142 dh->pub_key=BN_dup(dhp->pub_key); 1143 dh->priv_key=BN_dup(dhp->priv_key); 1144 if ((dh->pub_key == NULL) || 1145 (dh->priv_key == NULL)) 1146 { 1147 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 1148 goto err; 1149 } 1150 } 1151 r[0]=dh->p; 1152 r[1]=dh->g; 1153 r[2]=dh->pub_key; 1154 } 1155 else 1156#endif 1157#ifndef OPENSSL_NO_ECDH 1158 if (type & SSL_kEECDH) 1159 { 1160 const EC_GROUP *group; 1161 1162 ecdhp=cert->ecdh_tmp; 1163 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL)) 1164 { 1165 ecdhp=s->cert->ecdh_tmp_cb(s, 1166 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1167 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1168 } 1169 if (ecdhp == NULL) 1170 { 1171 al=SSL_AD_HANDSHAKE_FAILURE; 1172 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY); 1173 goto f_err; 1174 } 1175 1176 if (s->s3->tmp.ecdh != NULL) 1177 { 1178 EC_KEY_free(s->s3->tmp.ecdh); 1179 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1180 goto err; 1181 } 1182 1183 /* Duplicate the ECDH structure. */ 1184 if (ecdhp == NULL) 1185 { 1186 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1187 goto err; 1188 } 1189 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) 1190 { 1191 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1192 goto err; 1193 } 1194 1195 s->s3->tmp.ecdh=ecdh; 1196 if ((EC_KEY_get0_public_key(ecdh) == NULL) || 1197 (EC_KEY_get0_private_key(ecdh) == NULL) || 1198 (s->options & SSL_OP_SINGLE_ECDH_USE)) 1199 { 1200 if(!EC_KEY_generate_key(ecdh)) 1201 { 1202 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1203 goto err; 1204 } 1205 } 1206 1207 if (((group = EC_KEY_get0_group(ecdh)) == NULL) || 1208 (EC_KEY_get0_public_key(ecdh) == NULL) || 1209 (EC_KEY_get0_private_key(ecdh) == NULL)) 1210 { 1211 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1212 goto err; 1213 } 1214 1215 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 1216 (EC_GROUP_get_degree(group) > 163)) 1217 { 1218 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER); 1219 goto err; 1220 } 1221 1222 /* XXX: For now, we only support ephemeral ECDH 1223 * keys over named (not generic) curves. For 1224 * supported named curves, curve_id is non-zero. 1225 */ 1226 if ((curve_id = 1227 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group))) 1228 == 0) 1229 { 1230 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1231 goto err; 1232 } 1233 1234 /* Encode the public key. 1235 * First check the size of encoding and 1236 * allocate memory accordingly. 1237 */ 1238 encodedlen = EC_POINT_point2oct(group, 1239 EC_KEY_get0_public_key(ecdh), 1240 POINT_CONVERSION_UNCOMPRESSED, 1241 NULL, 0, NULL); 1242 1243 encodedPoint = (unsigned char *) 1244 OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 1245 bn_ctx = BN_CTX_new(); 1246 if ((encodedPoint == NULL) || (bn_ctx == NULL)) 1247 { 1248 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1249 goto err; 1250 } 1251 1252 1253 encodedlen = EC_POINT_point2oct(group, 1254 EC_KEY_get0_public_key(ecdh), 1255 POINT_CONVERSION_UNCOMPRESSED, 1256 encodedPoint, encodedlen, bn_ctx); 1257 1258 if (encodedlen == 0) 1259 { 1260 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1261 goto err; 1262 } 1263 1264 BN_CTX_free(bn_ctx); bn_ctx=NULL; 1265 1266 /* XXX: For now, we only support named (not 1267 * generic) curves in ECDH ephemeral key exchanges. 1268 * In this situation, we need four additional bytes 1269 * to encode the entire ServerECDHParams 1270 * structure. 1271 */ 1272 n = 4 + encodedlen; 1273 1274 /* We'll generate the serverKeyExchange message 1275 * explicitly so we can set these to NULLs 1276 */ 1277 r[0]=NULL; 1278 r[1]=NULL; 1279 r[2]=NULL; 1280 r[3]=NULL; 1281 } 1282 else 1283#endif /* !OPENSSL_NO_ECDH */ 1284#ifndef OPENSSL_NO_PSK 1285 if (type & SSL_kPSK) 1286 { 1287 /* reserve size for record length and PSK identity hint*/ 1288 n+=2+strlen(s->ctx->psk_identity_hint); 1289 } 1290 else 1291#endif /* !OPENSSL_NO_PSK */ 1292 { 1293 al=SSL_AD_HANDSHAKE_FAILURE; 1294 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1295 goto f_err; 1296 } 1297 for (i=0; r[i] != NULL; i++) 1298 { 1299 nr[i]=BN_num_bytes(r[i]); 1300 n+=2+nr[i]; 1301 } 1302 1303 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 1304 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 1305 { 1306 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL)) 1307 == NULL) 1308 { 1309 al=SSL_AD_DECODE_ERROR; 1310 goto f_err; 1311 } 1312 kn=EVP_PKEY_size(pkey); 1313 } 1314 else 1315 { 1316 pkey=NULL; 1317 kn=0; 1318 } 1319 1320 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn)) 1321 { 1322 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF); 1323 goto err; 1324 } 1325 d=(unsigned char *)s->init_buf->data; 1326 p= &(d[DTLS1_HM_HEADER_LENGTH]); 1327 1328 for (i=0; r[i] != NULL; i++) 1329 { 1330 s2n(nr[i],p); 1331 BN_bn2bin(r[i],p); 1332 p+=nr[i]; 1333 } 1334 1335#ifndef OPENSSL_NO_ECDH 1336 if (type & SSL_kEECDH) 1337 { 1338 /* XXX: For now, we only support named (not generic) curves. 1339 * In this situation, the serverKeyExchange message has: 1340 * [1 byte CurveType], [2 byte CurveName] 1341 * [1 byte length of encoded point], followed by 1342 * the actual encoded point itself 1343 */ 1344 *p = NAMED_CURVE_TYPE; 1345 p += 1; 1346 *p = 0; 1347 p += 1; 1348 *p = curve_id; 1349 p += 1; 1350 *p = encodedlen; 1351 p += 1; 1352 memcpy((unsigned char*)p, 1353 (unsigned char *)encodedPoint, 1354 encodedlen); 1355 OPENSSL_free(encodedPoint); 1356 encodedPoint = NULL; 1357 p += encodedlen; 1358 } 1359#endif 1360 1361#ifndef OPENSSL_NO_PSK 1362 if (type & SSL_kPSK) 1363 { 1364 /* copy PSK identity hint */ 1365 s2n(strlen(s->ctx->psk_identity_hint), p); 1366 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint)); 1367 p+=strlen(s->ctx->psk_identity_hint); 1368 } 1369#endif 1370 1371 /* not anonymous */ 1372 if (pkey != NULL) 1373 { 1374 /* n is the length of the params, they start at 1375 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space 1376 * at the end. */ 1377#ifndef OPENSSL_NO_RSA 1378 if (pkey->type == EVP_PKEY_RSA) 1379 { 1380 q=md_buf; 1381 j=0; 1382 for (num=2; num > 0; num--) 1383 { 1384 EVP_DigestInit_ex(&md_ctx,(num == 2) 1385 ?s->ctx->md5:s->ctx->sha1, NULL); 1386 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1387 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1388 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1389 EVP_DigestFinal_ex(&md_ctx,q, 1390 (unsigned int *)&i); 1391 q+=i; 1392 j+=i; 1393 } 1394 if (RSA_sign(NID_md5_sha1, md_buf, j, 1395 &(p[2]), &u, pkey->pkey.rsa) <= 0) 1396 { 1397 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA); 1398 goto err; 1399 } 1400 s2n(u,p); 1401 n+=u+2; 1402 } 1403 else 1404#endif 1405#if !defined(OPENSSL_NO_DSA) 1406 if (pkey->type == EVP_PKEY_DSA) 1407 { 1408 /* lets do DSS */ 1409 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL); 1410 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1411 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1412 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1413 if (!EVP_SignFinal(&md_ctx,&(p[2]), 1414 (unsigned int *)&i,pkey)) 1415 { 1416 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA); 1417 goto err; 1418 } 1419 s2n(i,p); 1420 n+=i+2; 1421 } 1422 else 1423#endif 1424#if !defined(OPENSSL_NO_ECDSA) 1425 if (pkey->type == EVP_PKEY_EC) 1426 { 1427 /* let's do ECDSA */ 1428 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL); 1429 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1430 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1431 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1432 if (!EVP_SignFinal(&md_ctx,&(p[2]), 1433 (unsigned int *)&i,pkey)) 1434 { 1435 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA); 1436 goto err; 1437 } 1438 s2n(i,p); 1439 n+=i+2; 1440 } 1441 else 1442#endif 1443 { 1444 /* Is this error check actually needed? */ 1445 al=SSL_AD_HANDSHAKE_FAILURE; 1446 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE); 1447 goto f_err; 1448 } 1449 } 1450 1451 d = dtls1_set_message_header(s, d, 1452 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n); 1453 1454 /* we should now have things packed up, so lets send 1455 * it off */ 1456 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1457 s->init_off=0; 1458 1459 /* buffer the message to handle re-xmits */ 1460 dtls1_buffer_message(s, 0); 1461 } 1462 1463 s->state = SSL3_ST_SW_KEY_EXCH_B; 1464 EVP_MD_CTX_cleanup(&md_ctx); 1465 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1466f_err: 1467 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1468err: 1469#ifndef OPENSSL_NO_ECDH 1470 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1471 BN_CTX_free(bn_ctx); 1472#endif 1473 EVP_MD_CTX_cleanup(&md_ctx); 1474 return(-1); 1475 } 1476 1477int dtls1_send_certificate_request(SSL *s) 1478 { 1479 unsigned char *p,*d; 1480 int i,j,nl,off,n; 1481 STACK_OF(X509_NAME) *sk=NULL; 1482 X509_NAME *name; 1483 BUF_MEM *buf; 1484 unsigned int msg_len; 1485 1486 if (s->state == SSL3_ST_SW_CERT_REQ_A) 1487 { 1488 buf=s->init_buf; 1489 1490 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); 1491 1492 /* get the list of acceptable cert types */ 1493 p++; 1494 n=ssl3_get_req_cert_type(s,p); 1495 d[0]=n; 1496 p+=n; 1497 n++; 1498 1499 off=n; 1500 p+=2; 1501 n+=2; 1502 1503 sk=SSL_get_client_CA_list(s); 1504 nl=0; 1505 if (sk != NULL) 1506 { 1507 for (i=0; i<sk_X509_NAME_num(sk); i++) 1508 { 1509 name=sk_X509_NAME_value(sk,i); 1510 j=i2d_X509_NAME(name,NULL); 1511 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2)) 1512 { 1513 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB); 1514 goto err; 1515 } 1516 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]); 1517 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) 1518 { 1519 s2n(j,p); 1520 i2d_X509_NAME(name,&p); 1521 n+=2+j; 1522 nl+=2+j; 1523 } 1524 else 1525 { 1526 d=p; 1527 i2d_X509_NAME(name,&p); 1528 j-=2; s2n(j,d); j+=2; 1529 n+=j; 1530 nl+=j; 1531 } 1532 } 1533 } 1534 /* else no CA names */ 1535 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]); 1536 s2n(nl,p); 1537 1538 d=(unsigned char *)buf->data; 1539 *(d++)=SSL3_MT_CERTIFICATE_REQUEST; 1540 l2n3(n,d); 1541 s2n(s->d1->handshake_write_seq,d); 1542 s->d1->handshake_write_seq++; 1543 1544 /* we should now have things packed up, so lets send 1545 * it off */ 1546 1547 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1548 s->init_off=0; 1549#ifdef NETSCAPE_HANG_BUG 1550/* XXX: what to do about this? */ 1551 p=(unsigned char *)s->init_buf->data + s->init_num; 1552 1553 /* do the header */ 1554 *(p++)=SSL3_MT_SERVER_DONE; 1555 *(p++)=0; 1556 *(p++)=0; 1557 *(p++)=0; 1558 s->init_num += 4; 1559#endif 1560 1561 /* XDTLS: set message header ? */ 1562 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1563 dtls1_set_message_header(s, (void *)s->init_buf->data, 1564 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len); 1565 1566 /* buffer the message to handle re-xmits */ 1567 dtls1_buffer_message(s, 0); 1568 1569 s->state = SSL3_ST_SW_CERT_REQ_B; 1570 } 1571 1572 /* SSL3_ST_SW_CERT_REQ_B */ 1573 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1574err: 1575 return(-1); 1576 } 1577 1578int dtls1_send_server_certificate(SSL *s) 1579 { 1580 unsigned long l; 1581 X509 *x; 1582 1583 if (s->state == SSL3_ST_SW_CERT_A) 1584 { 1585 x=ssl_get_server_send_cert(s); 1586 if (x == NULL) 1587 { 1588 /* VRS: allow null cert if auth == KRB5 */ 1589 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) || 1590 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5)) 1591 { 1592 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR); 1593 return(0); 1594 } 1595 } 1596 1597 l=dtls1_output_cert_chain(s,x); 1598 s->state=SSL3_ST_SW_CERT_B; 1599 s->init_num=(int)l; 1600 s->init_off=0; 1601 1602 /* buffer the message to handle re-xmits */ 1603 dtls1_buffer_message(s, 0); 1604 } 1605 1606 /* SSL3_ST_SW_CERT_B */ 1607 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1608 } 1609 1610#ifndef OPENSSL_NO_TLSEXT 1611int dtls1_send_newsession_ticket(SSL *s) 1612 { 1613 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) 1614 { 1615 unsigned char *p, *senc, *macstart; 1616 int len, slen; 1617 unsigned int hlen, msg_len; 1618 EVP_CIPHER_CTX ctx; 1619 HMAC_CTX hctx; 1620 SSL_CTX *tctx = s->initial_ctx; 1621 unsigned char iv[EVP_MAX_IV_LENGTH]; 1622 unsigned char key_name[16]; 1623 1624 /* get session encoding length */ 1625 slen = i2d_SSL_SESSION(s->session, NULL); 1626 /* Some length values are 16 bits, so forget it if session is 1627 * too long 1628 */ 1629 if (slen > 0xFF00) 1630 return -1; 1631 /* Grow buffer if need be: the length calculation is as 1632 * follows 12 (DTLS handshake message header) + 1633 * 4 (ticket lifetime hint) + 2 (ticket length) + 1634 * 16 (key name) + max_iv_len (iv length) + 1635 * session_length + max_enc_block_size (max encrypted session 1636 * length) + max_md_size (HMAC). 1637 */ 1638 if (!BUF_MEM_grow(s->init_buf, 1639 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH + 1640 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) 1641 return -1; 1642 senc = OPENSSL_malloc(slen); 1643 if (!senc) 1644 return -1; 1645 p = senc; 1646 i2d_SSL_SESSION(s->session, &p); 1647 1648 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]); 1649 EVP_CIPHER_CTX_init(&ctx); 1650 HMAC_CTX_init(&hctx); 1651 /* Initialize HMAC and cipher contexts. If callback present 1652 * it does all the work otherwise use generated values 1653 * from parent ctx. 1654 */ 1655 if (tctx->tlsext_ticket_key_cb) 1656 { 1657 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, 1658 &hctx, 1) < 0) 1659 { 1660 OPENSSL_free(senc); 1661 return -1; 1662 } 1663 } 1664 else 1665 { 1666 RAND_pseudo_bytes(iv, 16); 1667 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 1668 tctx->tlsext_tick_aes_key, iv); 1669 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, 1670 tlsext_tick_md(), NULL); 1671 memcpy(key_name, tctx->tlsext_tick_key_name, 16); 1672 } 1673 l2n(s->session->tlsext_tick_lifetime_hint, p); 1674 /* Skip ticket length for now */ 1675 p += 2; 1676 /* Output key name */ 1677 macstart = p; 1678 memcpy(p, key_name, 16); 1679 p += 16; 1680 /* output IV */ 1681 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx)); 1682 p += EVP_CIPHER_CTX_iv_length(&ctx); 1683 /* Encrypt session data */ 1684 EVP_EncryptUpdate(&ctx, p, &len, senc, slen); 1685 p += len; 1686 EVP_EncryptFinal(&ctx, p, &len); 1687 p += len; 1688 EVP_CIPHER_CTX_cleanup(&ctx); 1689 1690 HMAC_Update(&hctx, macstart, p - macstart); 1691 HMAC_Final(&hctx, p, &hlen); 1692 HMAC_CTX_cleanup(&hctx); 1693 1694 p += hlen; 1695 /* Now write out lengths: p points to end of data written */ 1696 /* Total length */ 1697 len = p - (unsigned char *)(s->init_buf->data); 1698 /* Ticket length */ 1699 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4; 1700 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p); 1701 1702 /* number of bytes to write */ 1703 s->init_num= len; 1704 s->state=SSL3_ST_SW_SESSION_TICKET_B; 1705 s->init_off=0; 1706 OPENSSL_free(senc); 1707 1708 /* XDTLS: set message header ? */ 1709 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1710 dtls1_set_message_header(s, (void *)s->init_buf->data, 1711 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len); 1712 1713 /* buffer the message to handle re-xmits */ 1714 dtls1_buffer_message(s, 0); 1715 } 1716 1717 /* SSL3_ST_SW_SESSION_TICKET_B */ 1718 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1719 } 1720#endif 1721