1 /* ssl/d1_srvr.c */ 2 /* 3 * DTLS implementation written by Nagendra Modadugu 4 * (nagendra (at) 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh (at) cryptsoft.com). 57 * 58 */ 59 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 60 * All rights reserved. 61 * 62 * This package is an SSL implementation written 63 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 128 129 static const SSL_METHOD *dtls1_get_server_method(int ver); 130 static int dtls1_send_hello_verify_request(SSL *s); 131 132 static 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 } 139 140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method, 141 dtls1_accept, 142 ssl_undefined_function, 143 dtls1_get_server_method) 144 145 int 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 /* clear this, it may get reset by 454 * send_server_key_exchange */ 455 if ((s->options & SSL_OP_EPHEMERAL_RSA) 456 #ifndef OPENSSL_NO_KRB5 457 && !(alg_k & SSL_kKRB5) 458 #endif /* OPENSSL_NO_KRB5 */ 459 ) 460 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key 461 * even when forbidden by protocol specs 462 * (handshake may fail as clients are not required to 463 * be able to handle this) */ 464 s->s3->tmp.use_rsa_tmp=1; 465 else 466 s->s3->tmp.use_rsa_tmp=0; 467 468 /* only send if a DH key exchange or 469 * RSA but we have a sign only certificate */ 470 if (s->s3->tmp.use_rsa_tmp 471 /* PSK: send ServerKeyExchange if PSK identity 472 * hint if provided */ 473 #ifndef OPENSSL_NO_PSK 474 || ((alg_k & SSL_kPSK) && s->session->psk_identity_hint) 475 #endif 476 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 477 || (alg_k & SSL_kEECDH) 478 || ((alg_k & SSL_kRSA) 479 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL 480 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) 481 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) 482 ) 483 ) 484 ) 485 ) 486 { 487 dtls1_start_timer(s); 488 ret=dtls1_send_server_key_exchange(s); 489 if (ret <= 0) goto end; 490 } 491 else 492 skip=1; 493 494 s->state=SSL3_ST_SW_CERT_REQ_A; 495 s->init_num=0; 496 break; 497 498 case SSL3_ST_SW_CERT_REQ_A: 499 case SSL3_ST_SW_CERT_REQ_B: 500 if (/* don't request cert unless asked for it: */ 501 !(s->verify_mode & SSL_VERIFY_PEER) || 502 /* if SSL_VERIFY_CLIENT_ONCE is set, 503 * don't request cert during re-negotiation: */ 504 ((s->session->peer != NULL) && 505 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 506 /* never request cert in anonymous ciphersuites 507 * (see section "Certificate request" in SSL 3 drafts 508 * and in RFC 2246): */ 509 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 510 /* ... except when the application insists on verification 511 * (against the specs, but s3_clnt.c accepts this for SSL 3) */ 512 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || 513 /* never request cert in Kerberos ciphersuites */ 514 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) 515 /* With normal PSK Certificates and 516 * Certificate Requests are omitted */ 517 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 518 { 519 /* no cert request */ 520 skip=1; 521 s->s3->tmp.cert_request=0; 522 s->state=SSL3_ST_SW_SRVR_DONE_A; 523 #ifndef OPENSSL_NO_SCTP 524 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 525 { 526 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 527 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 528 } 529 #endif 530 } 531 else 532 { 533 s->s3->tmp.cert_request=1; 534 dtls1_start_timer(s); 535 ret=dtls1_send_certificate_request(s); 536 if (ret <= 0) goto end; 537 #ifndef NETSCAPE_HANG_BUG 538 s->state=SSL3_ST_SW_SRVR_DONE_A; 539 #ifndef OPENSSL_NO_SCTP 540 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 541 { 542 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 543 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 544 } 545 #endif 546 #else 547 s->state=SSL3_ST_SW_FLUSH; 548 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 549 #ifndef OPENSSL_NO_SCTP 550 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 551 { 552 s->d1->next_state = s->s3->tmp.next_state; 553 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK; 554 } 555 #endif 556 #endif 557 s->init_num=0; 558 } 559 break; 560 561 case SSL3_ST_SW_SRVR_DONE_A: 562 case SSL3_ST_SW_SRVR_DONE_B: 563 dtls1_start_timer(s); 564 ret=dtls1_send_server_done(s); 565 if (ret <= 0) goto end; 566 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 567 s->state=SSL3_ST_SW_FLUSH; 568 s->init_num=0; 569 break; 570 571 case SSL3_ST_SW_FLUSH: 572 s->rwstate=SSL_WRITING; 573 if (BIO_flush(s->wbio) <= 0) 574 { 575 /* If the write error was fatal, stop trying */ 576 if (!BIO_should_retry(s->wbio)) 577 { 578 s->rwstate=SSL_NOTHING; 579 s->state=s->s3->tmp.next_state; 580 } 581 582 ret= -1; 583 goto end; 584 } 585 s->rwstate=SSL_NOTHING; 586 s->state=s->s3->tmp.next_state; 587 break; 588 589 case SSL3_ST_SR_CERT_A: 590 case SSL3_ST_SR_CERT_B: 591 /* Check for second client hello (MS SGC) */ 592 ret = ssl3_check_client_hello(s); 593 if (ret <= 0) 594 goto end; 595 if (ret == 2) 596 { 597 dtls1_stop_timer(s); 598 s->state = SSL3_ST_SR_CLNT_HELLO_C; 599 } 600 else { 601 if (s->s3->tmp.cert_request) 602 { 603 ret=ssl3_get_client_certificate(s); 604 if (ret <= 0) goto end; 605 } 606 s->init_num=0; 607 s->state=SSL3_ST_SR_KEY_EXCH_A; 608 } 609 break; 610 611 case SSL3_ST_SR_KEY_EXCH_A: 612 case SSL3_ST_SR_KEY_EXCH_B: 613 ret=ssl3_get_client_key_exchange(s); 614 if (ret <= 0) goto end; 615 #ifndef OPENSSL_NO_SCTP 616 /* Add new shared key for SCTP-Auth, 617 * will be ignored if no SCTP used. 618 */ 619 snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 620 DTLS1_SCTP_AUTH_LABEL); 621 622 SSL_export_keying_material(s, sctpauthkey, 623 sizeof(sctpauthkey), labelbuffer, 624 sizeof(labelbuffer), NULL, 0, 0); 625 626 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 627 sizeof(sctpauthkey), sctpauthkey); 628 #endif 629 630 s->state=SSL3_ST_SR_CERT_VRFY_A; 631 s->init_num=0; 632 633 if (ret == 2) 634 { 635 /* For the ECDH ciphersuites when 636 * the client sends its ECDH pub key in 637 * a certificate, the CertificateVerify 638 * message is not sent. 639 */ 640 s->state=SSL3_ST_SR_FINISHED_A; 641 s->init_num = 0; 642 } 643 else 644 { 645 s->state=SSL3_ST_SR_CERT_VRFY_A; 646 s->init_num=0; 647 648 /* We need to get hashes here so if there is 649 * a client cert, it can be verified */ 650 s->method->ssl3_enc->cert_verify_mac(s, 651 NID_md5, 652 &(s->s3->tmp.cert_verify_md[0])); 653 s->method->ssl3_enc->cert_verify_mac(s, 654 NID_sha1, 655 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH])); 656 } 657 break; 658 659 case SSL3_ST_SR_CERT_VRFY_A: 660 case SSL3_ST_SR_CERT_VRFY_B: 661 662 s->d1->change_cipher_spec_ok = 1; 663 /* we should decide if we expected this one */ 664 ret=ssl3_get_cert_verify(s); 665 if (ret <= 0) goto end; 666 #ifndef OPENSSL_NO_SCTP 667 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 668 state == SSL_ST_RENEGOTIATE) 669 s->state=DTLS1_SCTP_ST_SR_READ_SOCK; 670 else 671 #endif 672 s->state=SSL3_ST_SR_FINISHED_A; 673 s->init_num=0; 674 break; 675 676 case SSL3_ST_SR_FINISHED_A: 677 case SSL3_ST_SR_FINISHED_B: 678 s->d1->change_cipher_spec_ok = 1; 679 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A, 680 SSL3_ST_SR_FINISHED_B); 681 if (ret <= 0) goto end; 682 dtls1_stop_timer(s); 683 if (s->hit) 684 s->state=SSL_ST_OK; 685 #ifndef OPENSSL_NO_TLSEXT 686 else if (s->tlsext_ticket_expected) 687 s->state=SSL3_ST_SW_SESSION_TICKET_A; 688 #endif 689 else 690 s->state=SSL3_ST_SW_CHANGE_A; 691 s->init_num=0; 692 break; 693 694 #ifndef OPENSSL_NO_TLSEXT 695 case SSL3_ST_SW_SESSION_TICKET_A: 696 case SSL3_ST_SW_SESSION_TICKET_B: 697 ret=dtls1_send_newsession_ticket(s); 698 if (ret <= 0) goto end; 699 s->state=SSL3_ST_SW_CHANGE_A; 700 s->init_num=0; 701 break; 702 703 case SSL3_ST_SW_CERT_STATUS_A: 704 case SSL3_ST_SW_CERT_STATUS_B: 705 ret=ssl3_send_cert_status(s); 706 if (ret <= 0) goto end; 707 s->state=SSL3_ST_SW_KEY_EXCH_A; 708 s->init_num=0; 709 break; 710 711 #endif 712 713 case SSL3_ST_SW_CHANGE_A: 714 case SSL3_ST_SW_CHANGE_B: 715 716 s->session->cipher=s->s3->tmp.new_cipher; 717 if (!s->method->ssl3_enc->setup_key_block(s)) 718 { ret= -1; goto end; } 719 720 ret=dtls1_send_change_cipher_spec(s, 721 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B); 722 723 if (ret <= 0) goto end; 724 725 #ifndef OPENSSL_NO_SCTP 726 if (!s->hit) 727 { 728 /* Change to new shared key of SCTP-Auth, 729 * will be ignored if no SCTP used. 730 */ 731 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 732 } 733 #endif 734 735 s->state=SSL3_ST_SW_FINISHED_A; 736 s->init_num=0; 737 738 if (!s->method->ssl3_enc->change_cipher_state(s, 739 SSL3_CHANGE_CIPHER_SERVER_WRITE)) 740 { 741 ret= -1; 742 goto end; 743 } 744 745 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 746 break; 747 748 case SSL3_ST_SW_FINISHED_A: 749 case SSL3_ST_SW_FINISHED_B: 750 ret=dtls1_send_finished(s, 751 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B, 752 s->method->ssl3_enc->server_finished_label, 753 s->method->ssl3_enc->server_finished_label_len); 754 if (ret <= 0) goto end; 755 s->state=SSL3_ST_SW_FLUSH; 756 if (s->hit) 757 { 758 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A; 759 760 #ifndef OPENSSL_NO_SCTP 761 /* Change to new shared key of SCTP-Auth, 762 * will be ignored if no SCTP used. 763 */ 764 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 765 #endif 766 } 767 else 768 { 769 s->s3->tmp.next_state=SSL_ST_OK; 770 #ifndef OPENSSL_NO_SCTP 771 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 772 { 773 s->d1->next_state = s->s3->tmp.next_state; 774 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK; 775 } 776 #endif 777 } 778 s->init_num=0; 779 break; 780 781 case SSL_ST_OK: 782 /* clean a few things up */ 783 ssl3_cleanup_key_block(s); 784 785 #if 0 786 BUF_MEM_free(s->init_buf); 787 s->init_buf=NULL; 788 #endif 789 790 /* remove buffering on output */ 791 ssl_free_wbio_buffer(s); 792 793 s->init_num=0; 794 795 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */ 796 { 797 s->renegotiate=0; 798 s->new_session=0; 799 800 ssl_update_cache(s,SSL_SESS_CACHE_SERVER); 801 802 s->ctx->stats.sess_accept_good++; 803 /* s->server=1; */ 804 s->handshake_func=dtls1_accept; 805 806 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 807 } 808 809 ret = 1; 810 811 /* done handshaking, next message is client hello */ 812 s->d1->handshake_read_seq = 0; 813 /* next message is server hello */ 814 s->d1->handshake_write_seq = 0; 815 s->d1->next_handshake_write_seq = 0; 816 goto end; 817 /* break; */ 818 819 default: 820 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE); 821 ret= -1; 822 goto end; 823 /* break; */ 824 } 825 826 if (!s->s3->tmp.reuse_message && !skip) 827 { 828 if (s->debug) 829 { 830 if ((ret=BIO_flush(s->wbio)) <= 0) 831 goto end; 832 } 833 834 835 if ((cb != NULL) && (s->state != state)) 836 { 837 new_state=s->state; 838 s->state=state; 839 cb(s,SSL_CB_ACCEPT_LOOP,1); 840 s->state=new_state; 841 } 842 } 843 skip=0; 844 } 845 end: 846 /* BIO_flush(s->wbio); */ 847 848 s->in_handshake--; 849 #ifndef OPENSSL_NO_SCTP 850 /* Notify SCTP BIO socket to leave handshake 851 * mode and prevent stream identifier other 852 * than 0. Will be ignored if no SCTP is used. 853 */ 854 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL); 855 #endif 856 857 if (cb != NULL) 858 cb(s,SSL_CB_ACCEPT_EXIT,ret); 859 return(ret); 860 } 861 862 int dtls1_send_hello_request(SSL *s) 863 { 864 unsigned char *p; 865 866 if (s->state == SSL3_ST_SW_HELLO_REQ_A) 867 { 868 p=(unsigned char *)s->init_buf->data; 869 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0); 870 871 s->state=SSL3_ST_SW_HELLO_REQ_B; 872 /* number of bytes to write */ 873 s->init_num=DTLS1_HM_HEADER_LENGTH; 874 s->init_off=0; 875 876 /* no need to buffer this message, since there are no retransmit 877 * requests for it */ 878 } 879 880 /* SSL3_ST_SW_HELLO_REQ_B */ 881 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 882 } 883 884 int dtls1_send_hello_verify_request(SSL *s) 885 { 886 unsigned int msg_len; 887 unsigned char *msg, *buf, *p; 888 889 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) 890 { 891 buf = (unsigned char *)s->init_buf->data; 892 893 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 894 *(p++) = s->version >> 8; 895 *(p++) = s->version & 0xFF; 896 897 if (s->ctx->app_gen_cookie_cb == NULL || 898 s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 899 &(s->d1->cookie_len)) == 0) 900 { 901 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR); 902 return 0; 903 } 904 905 *(p++) = (unsigned char) s->d1->cookie_len; 906 memcpy(p, s->d1->cookie, s->d1->cookie_len); 907 p += s->d1->cookie_len; 908 msg_len = p - msg; 909 910 dtls1_set_message_header(s, buf, 911 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len); 912 913 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 914 /* number of bytes to write */ 915 s->init_num=p-buf; 916 s->init_off=0; 917 } 918 919 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 920 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 921 } 922 923 int dtls1_send_server_hello(SSL *s) 924 { 925 unsigned char *buf; 926 unsigned char *p,*d; 927 int i; 928 unsigned int sl; 929 unsigned long l; 930 931 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) 932 { 933 buf=(unsigned char *)s->init_buf->data; 934 p=s->s3->server_random; 935 ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE); 936 /* Do the message type and length last */ 937 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 938 939 *(p++)=s->version>>8; 940 *(p++)=s->version&0xff; 941 942 /* Random stuff */ 943 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 944 p+=SSL3_RANDOM_SIZE; 945 946 /* now in theory we have 3 options to sending back the 947 * session id. If it is a re-use, we send back the 948 * old session-id, if it is a new session, we send 949 * back the new session-id or we send back a 0 length 950 * session-id if we want it to be single use. 951 * Currently I will not implement the '0' length session-id 952 * 12-Jan-98 - I'll now support the '0' length stuff. 953 */ 954 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) 955 s->session->session_id_length=0; 956 957 sl=s->session->session_id_length; 958 if (sl > sizeof s->session->session_id) 959 { 960 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 961 return -1; 962 } 963 *(p++)=sl; 964 memcpy(p,s->session->session_id,sl); 965 p+=sl; 966 967 /* put the cipher */ 968 if (s->s3->tmp.new_cipher == NULL) 969 return -1; 970 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p); 971 p+=i; 972 973 /* put the compression method */ 974 #ifdef OPENSSL_NO_COMP 975 *(p++)=0; 976 #else 977 if (s->s3->tmp.new_compression == NULL) 978 *(p++)=0; 979 else 980 *(p++)=s->s3->tmp.new_compression->id; 981 #endif 982 983 #ifndef OPENSSL_NO_TLSEXT 984 if (ssl_prepare_serverhello_tlsext(s) <= 0) 985 { 986 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT); 987 return -1; 988 } 989 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 990 { 991 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR); 992 return -1; 993 } 994 #endif 995 996 /* do the header */ 997 l=(p-d); 998 d=buf; 999 1000 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l); 1001 1002 s->state=SSL3_ST_SW_SRVR_HELLO_B; 1003 /* number of bytes to write */ 1004 s->init_num=p-buf; 1005 s->init_off=0; 1006 1007 /* buffer the message to handle re-xmits */ 1008 dtls1_buffer_message(s, 0); 1009 } 1010 1011 /* SSL3_ST_SW_SRVR_HELLO_B */ 1012 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1013 } 1014 1015 int dtls1_send_server_done(SSL *s) 1016 { 1017 unsigned char *p; 1018 1019 if (s->state == SSL3_ST_SW_SRVR_DONE_A) 1020 { 1021 p=(unsigned char *)s->init_buf->data; 1022 1023 /* do the header */ 1024 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0); 1025 1026 s->state=SSL3_ST_SW_SRVR_DONE_B; 1027 /* number of bytes to write */ 1028 s->init_num=DTLS1_HM_HEADER_LENGTH; 1029 s->init_off=0; 1030 1031 /* buffer the message to handle re-xmits */ 1032 dtls1_buffer_message(s, 0); 1033 } 1034 1035 /* SSL3_ST_SW_SRVR_DONE_B */ 1036 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1037 } 1038 1039 int dtls1_send_server_key_exchange(SSL *s) 1040 { 1041 #ifndef OPENSSL_NO_RSA 1042 unsigned char *q; 1043 int j,num; 1044 RSA *rsa; 1045 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1046 unsigned int u; 1047 #endif 1048 #ifndef OPENSSL_NO_DH 1049 DH *dh=NULL,*dhp; 1050 #endif 1051 #ifndef OPENSSL_NO_ECDH 1052 EC_KEY *ecdh=NULL, *ecdhp; 1053 unsigned char *encodedPoint = NULL; 1054 int encodedlen = 0; 1055 int curve_id = 0; 1056 BN_CTX *bn_ctx = NULL; 1057 #endif 1058 EVP_PKEY *pkey; 1059 unsigned char *p,*d; 1060 int al,i; 1061 unsigned long type; 1062 int n; 1063 CERT *cert; 1064 BIGNUM *r[4]; 1065 int nr[4],kn; 1066 BUF_MEM *buf; 1067 EVP_MD_CTX md_ctx; 1068 1069 EVP_MD_CTX_init(&md_ctx); 1070 if (s->state == SSL3_ST_SW_KEY_EXCH_A) 1071 { 1072 type=s->s3->tmp.new_cipher->algorithm_mkey; 1073 cert=s->cert; 1074 1075 buf=s->init_buf; 1076 1077 r[0]=r[1]=r[2]=r[3]=NULL; 1078 n=0; 1079 #ifndef OPENSSL_NO_RSA 1080 if (type & SSL_kRSA) 1081 { 1082 rsa=cert->rsa_tmp; 1083 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) 1084 { 1085 rsa=s->cert->rsa_tmp_cb(s, 1086 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1087 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1088 if(rsa == NULL) 1089 { 1090 al=SSL_AD_HANDSHAKE_FAILURE; 1091 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY); 1092 goto f_err; 1093 } 1094 RSA_up_ref(rsa); 1095 cert->rsa_tmp=rsa; 1096 } 1097 if (rsa == NULL) 1098 { 1099 al=SSL_AD_HANDSHAKE_FAILURE; 1100 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY); 1101 goto f_err; 1102 } 1103 r[0]=rsa->n; 1104 r[1]=rsa->e; 1105 s->s3->tmp.use_rsa_tmp=1; 1106 } 1107 else 1108 #endif 1109 #ifndef OPENSSL_NO_DH 1110 if (type & SSL_kEDH) 1111 { 1112 dhp=cert->dh_tmp; 1113 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) 1114 dhp=s->cert->dh_tmp_cb(s, 1115 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1116 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1117 if (dhp == NULL) 1118 { 1119 al=SSL_AD_HANDSHAKE_FAILURE; 1120 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY); 1121 goto f_err; 1122 } 1123 1124 if (s->s3->tmp.dh != NULL) 1125 { 1126 DH_free(dh); 1127 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1128 goto err; 1129 } 1130 1131 if ((dh=DHparams_dup(dhp)) == NULL) 1132 { 1133 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 1134 goto err; 1135 } 1136 1137 s->s3->tmp.dh=dh; 1138 if ((dhp->pub_key == NULL || 1139 dhp->priv_key == NULL || 1140 (s->options & SSL_OP_SINGLE_DH_USE))) 1141 { 1142 if(!DH_generate_key(dh)) 1143 { 1144 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1145 ERR_R_DH_LIB); 1146 goto err; 1147 } 1148 } 1149 else 1150 { 1151 dh->pub_key=BN_dup(dhp->pub_key); 1152 dh->priv_key=BN_dup(dhp->priv_key); 1153 if ((dh->pub_key == NULL) || 1154 (dh->priv_key == NULL)) 1155 { 1156 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 1157 goto err; 1158 } 1159 } 1160 r[0]=dh->p; 1161 r[1]=dh->g; 1162 r[2]=dh->pub_key; 1163 } 1164 else 1165 #endif 1166 #ifndef OPENSSL_NO_ECDH 1167 if (type & SSL_kEECDH) 1168 { 1169 const EC_GROUP *group; 1170 1171 ecdhp=cert->ecdh_tmp; 1172 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL)) 1173 { 1174 ecdhp=s->cert->ecdh_tmp_cb(s, 1175 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1176 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1177 } 1178 if (ecdhp == NULL) 1179 { 1180 al=SSL_AD_HANDSHAKE_FAILURE; 1181 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY); 1182 goto f_err; 1183 } 1184 1185 if (s->s3->tmp.ecdh != NULL) 1186 { 1187 EC_KEY_free(s->s3->tmp.ecdh); 1188 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1189 goto err; 1190 } 1191 1192 /* Duplicate the ECDH structure. */ 1193 if (ecdhp == NULL) 1194 { 1195 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1196 goto err; 1197 } 1198 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) 1199 { 1200 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1201 goto err; 1202 } 1203 1204 s->s3->tmp.ecdh=ecdh; 1205 if ((EC_KEY_get0_public_key(ecdh) == NULL) || 1206 (EC_KEY_get0_private_key(ecdh) == NULL) || 1207 (s->options & SSL_OP_SINGLE_ECDH_USE)) 1208 { 1209 if(!EC_KEY_generate_key(ecdh)) 1210 { 1211 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1212 goto err; 1213 } 1214 } 1215 1216 if (((group = EC_KEY_get0_group(ecdh)) == NULL) || 1217 (EC_KEY_get0_public_key(ecdh) == NULL) || 1218 (EC_KEY_get0_private_key(ecdh) == NULL)) 1219 { 1220 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1221 goto err; 1222 } 1223 1224 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 1225 (EC_GROUP_get_degree(group) > 163)) 1226 { 1227 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER); 1228 goto err; 1229 } 1230 1231 /* XXX: For now, we only support ephemeral ECDH 1232 * keys over named (not generic) curves. For 1233 * supported named curves, curve_id is non-zero. 1234 */ 1235 if ((curve_id = 1236 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group))) 1237 == 0) 1238 { 1239 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1240 goto err; 1241 } 1242 1243 /* Encode the public key. 1244 * First check the size of encoding and 1245 * allocate memory accordingly. 1246 */ 1247 encodedlen = EC_POINT_point2oct(group, 1248 EC_KEY_get0_public_key(ecdh), 1249 POINT_CONVERSION_UNCOMPRESSED, 1250 NULL, 0, NULL); 1251 1252 encodedPoint = (unsigned char *) 1253 OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 1254 bn_ctx = BN_CTX_new(); 1255 if ((encodedPoint == NULL) || (bn_ctx == NULL)) 1256 { 1257 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1258 goto err; 1259 } 1260 1261 1262 encodedlen = EC_POINT_point2oct(group, 1263 EC_KEY_get0_public_key(ecdh), 1264 POINT_CONVERSION_UNCOMPRESSED, 1265 encodedPoint, encodedlen, bn_ctx); 1266 1267 if (encodedlen == 0) 1268 { 1269 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1270 goto err; 1271 } 1272 1273 BN_CTX_free(bn_ctx); bn_ctx=NULL; 1274 1275 /* XXX: For now, we only support named (not 1276 * generic) curves in ECDH ephemeral key exchanges. 1277 * In this situation, we need four additional bytes 1278 * to encode the entire ServerECDHParams 1279 * structure. 1280 */ 1281 n = 4 + encodedlen; 1282 1283 /* We'll generate the serverKeyExchange message 1284 * explicitly so we can set these to NULLs 1285 */ 1286 r[0]=NULL; 1287 r[1]=NULL; 1288 r[2]=NULL; 1289 r[3]=NULL; 1290 } 1291 else 1292 #endif /* !OPENSSL_NO_ECDH */ 1293 #ifndef OPENSSL_NO_PSK 1294 if (type & SSL_kPSK) 1295 { 1296 /* reserve size for record length and PSK identity hint*/ 1297 n+=2+strlen(s->session->psk_identity_hint); 1298 } 1299 else 1300 #endif /* !OPENSSL_NO_PSK */ 1301 { 1302 al=SSL_AD_HANDSHAKE_FAILURE; 1303 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1304 goto f_err; 1305 } 1306 for (i=0; r[i] != NULL; i++) 1307 { 1308 nr[i]=BN_num_bytes(r[i]); 1309 n+=2+nr[i]; 1310 } 1311 1312 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 1313 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 1314 { 1315 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL)) 1316 == NULL) 1317 { 1318 al=SSL_AD_DECODE_ERROR; 1319 goto f_err; 1320 } 1321 kn=EVP_PKEY_size(pkey); 1322 } 1323 else 1324 { 1325 pkey=NULL; 1326 kn=0; 1327 } 1328 1329 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn)) 1330 { 1331 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF); 1332 goto err; 1333 } 1334 d=(unsigned char *)s->init_buf->data; 1335 p= &(d[DTLS1_HM_HEADER_LENGTH]); 1336 1337 for (i=0; r[i] != NULL; i++) 1338 { 1339 s2n(nr[i],p); 1340 BN_bn2bin(r[i],p); 1341 p+=nr[i]; 1342 } 1343 1344 #ifndef OPENSSL_NO_ECDH 1345 if (type & SSL_kEECDH) 1346 { 1347 /* XXX: For now, we only support named (not generic) curves. 1348 * In this situation, the serverKeyExchange message has: 1349 * [1 byte CurveType], [2 byte CurveName] 1350 * [1 byte length of encoded point], followed by 1351 * the actual encoded point itself 1352 */ 1353 *p = NAMED_CURVE_TYPE; 1354 p += 1; 1355 *p = 0; 1356 p += 1; 1357 *p = curve_id; 1358 p += 1; 1359 *p = encodedlen; 1360 p += 1; 1361 memcpy((unsigned char*)p, 1362 (unsigned char *)encodedPoint, 1363 encodedlen); 1364 OPENSSL_free(encodedPoint); 1365 encodedPoint = NULL; 1366 p += encodedlen; 1367 } 1368 #endif 1369 1370 #ifndef OPENSSL_NO_PSK 1371 if (type & SSL_kPSK) 1372 { 1373 /* copy PSK identity hint */ 1374 s2n(strlen(s->session->psk_identity_hint), p); 1375 strncpy((char *)p, s->session->psk_identity_hint, strlen(s->session->psk_identity_hint)); 1376 p+=strlen(s->session->psk_identity_hint); 1377 } 1378 #endif 1379 1380 /* not anonymous */ 1381 if (pkey != NULL) 1382 { 1383 /* n is the length of the params, they start at 1384 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space 1385 * at the end. */ 1386 #ifndef OPENSSL_NO_RSA 1387 if (pkey->type == EVP_PKEY_RSA) 1388 { 1389 q=md_buf; 1390 j=0; 1391 for (num=2; num > 0; num--) 1392 { 1393 EVP_DigestInit_ex(&md_ctx,(num == 2) 1394 ?s->ctx->md5:s->ctx->sha1, NULL); 1395 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1396 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1397 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1398 EVP_DigestFinal_ex(&md_ctx,q, 1399 (unsigned int *)&i); 1400 q+=i; 1401 j+=i; 1402 } 1403 if (RSA_sign(NID_md5_sha1, md_buf, j, 1404 &(p[2]), &u, pkey->pkey.rsa) <= 0) 1405 { 1406 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA); 1407 goto err; 1408 } 1409 s2n(u,p); 1410 n+=u+2; 1411 } 1412 else 1413 #endif 1414 #if !defined(OPENSSL_NO_DSA) 1415 if (pkey->type == EVP_PKEY_DSA) 1416 { 1417 /* lets do DSS */ 1418 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL); 1419 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1420 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1421 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1422 if (!EVP_SignFinal(&md_ctx,&(p[2]), 1423 (unsigned int *)&i,pkey)) 1424 { 1425 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA); 1426 goto err; 1427 } 1428 s2n(i,p); 1429 n+=i+2; 1430 } 1431 else 1432 #endif 1433 #if !defined(OPENSSL_NO_ECDSA) 1434 if (pkey->type == EVP_PKEY_EC) 1435 { 1436 /* let's do ECDSA */ 1437 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL); 1438 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1439 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1440 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1441 if (!EVP_SignFinal(&md_ctx,&(p[2]), 1442 (unsigned int *)&i,pkey)) 1443 { 1444 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA); 1445 goto err; 1446 } 1447 s2n(i,p); 1448 n+=i+2; 1449 } 1450 else 1451 #endif 1452 { 1453 /* Is this error check actually needed? */ 1454 al=SSL_AD_HANDSHAKE_FAILURE; 1455 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE); 1456 goto f_err; 1457 } 1458 } 1459 1460 d = dtls1_set_message_header(s, d, 1461 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n); 1462 1463 /* we should now have things packed up, so lets send 1464 * it off */ 1465 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1466 s->init_off=0; 1467 1468 /* buffer the message to handle re-xmits */ 1469 dtls1_buffer_message(s, 0); 1470 } 1471 1472 s->state = SSL3_ST_SW_KEY_EXCH_B; 1473 EVP_MD_CTX_cleanup(&md_ctx); 1474 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1475 f_err: 1476 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1477 err: 1478 #ifndef OPENSSL_NO_ECDH 1479 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1480 BN_CTX_free(bn_ctx); 1481 #endif 1482 EVP_MD_CTX_cleanup(&md_ctx); 1483 return(-1); 1484 } 1485 1486 int dtls1_send_certificate_request(SSL *s) 1487 { 1488 unsigned char *p,*d; 1489 int i,j,nl,off,n; 1490 STACK_OF(X509_NAME) *sk=NULL; 1491 X509_NAME *name; 1492 BUF_MEM *buf; 1493 unsigned int msg_len; 1494 1495 if (s->state == SSL3_ST_SW_CERT_REQ_A) 1496 { 1497 buf=s->init_buf; 1498 1499 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); 1500 1501 /* get the list of acceptable cert types */ 1502 p++; 1503 n=ssl3_get_req_cert_type(s,p); 1504 d[0]=n; 1505 p+=n; 1506 n++; 1507 1508 off=n; 1509 p+=2; 1510 n+=2; 1511 1512 sk=SSL_get_client_CA_list(s); 1513 nl=0; 1514 if (sk != NULL) 1515 { 1516 for (i=0; i<sk_X509_NAME_num(sk); i++) 1517 { 1518 name=sk_X509_NAME_value(sk,i); 1519 j=i2d_X509_NAME(name,NULL); 1520 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2)) 1521 { 1522 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB); 1523 goto err; 1524 } 1525 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]); 1526 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) 1527 { 1528 s2n(j,p); 1529 i2d_X509_NAME(name,&p); 1530 n+=2+j; 1531 nl+=2+j; 1532 } 1533 else 1534 { 1535 d=p; 1536 i2d_X509_NAME(name,&p); 1537 j-=2; s2n(j,d); j+=2; 1538 n+=j; 1539 nl+=j; 1540 } 1541 } 1542 } 1543 /* else no CA names */ 1544 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]); 1545 s2n(nl,p); 1546 1547 d=(unsigned char *)buf->data; 1548 *(d++)=SSL3_MT_CERTIFICATE_REQUEST; 1549 l2n3(n,d); 1550 s2n(s->d1->handshake_write_seq,d); 1551 s->d1->handshake_write_seq++; 1552 1553 /* we should now have things packed up, so lets send 1554 * it off */ 1555 1556 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1557 s->init_off=0; 1558 #ifdef NETSCAPE_HANG_BUG 1559 /* XXX: what to do about this? */ 1560 p=(unsigned char *)s->init_buf->data + s->init_num; 1561 1562 /* do the header */ 1563 *(p++)=SSL3_MT_SERVER_DONE; 1564 *(p++)=0; 1565 *(p++)=0; 1566 *(p++)=0; 1567 s->init_num += 4; 1568 #endif 1569 1570 /* XDTLS: set message header ? */ 1571 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1572 dtls1_set_message_header(s, (void *)s->init_buf->data, 1573 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len); 1574 1575 /* buffer the message to handle re-xmits */ 1576 dtls1_buffer_message(s, 0); 1577 1578 s->state = SSL3_ST_SW_CERT_REQ_B; 1579 } 1580 1581 /* SSL3_ST_SW_CERT_REQ_B */ 1582 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1583 err: 1584 return(-1); 1585 } 1586 1587 int dtls1_send_server_certificate(SSL *s) 1588 { 1589 unsigned long l; 1590 X509 *x; 1591 1592 if (s->state == SSL3_ST_SW_CERT_A) 1593 { 1594 x=ssl_get_server_send_cert(s); 1595 if (x == NULL) 1596 { 1597 /* VRS: allow null cert if auth == KRB5 */ 1598 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) || 1599 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5)) 1600 { 1601 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR); 1602 return(0); 1603 } 1604 } 1605 1606 l=dtls1_output_cert_chain(s,x); 1607 s->state=SSL3_ST_SW_CERT_B; 1608 s->init_num=(int)l; 1609 s->init_off=0; 1610 1611 /* buffer the message to handle re-xmits */ 1612 dtls1_buffer_message(s, 0); 1613 } 1614 1615 /* SSL3_ST_SW_CERT_B */ 1616 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1617 } 1618 1619 #ifndef OPENSSL_NO_TLSEXT 1620 int dtls1_send_newsession_ticket(SSL *s) 1621 { 1622 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) 1623 { 1624 unsigned char *p, *senc, *macstart; 1625 int len, slen; 1626 unsigned int hlen, msg_len; 1627 EVP_CIPHER_CTX ctx; 1628 HMAC_CTX hctx; 1629 SSL_CTX *tctx = s->initial_ctx; 1630 unsigned char iv[EVP_MAX_IV_LENGTH]; 1631 unsigned char key_name[16]; 1632 1633 /* get session encoding length */ 1634 slen = i2d_SSL_SESSION(s->session, NULL); 1635 /* Some length values are 16 bits, so forget it if session is 1636 * too long 1637 */ 1638 if (slen > 0xFF00) 1639 return -1; 1640 /* Grow buffer if need be: the length calculation is as 1641 * follows 12 (DTLS handshake message header) + 1642 * 4 (ticket lifetime hint) + 2 (ticket length) + 1643 * 16 (key name) + max_iv_len (iv length) + 1644 * session_length + max_enc_block_size (max encrypted session 1645 * length) + max_md_size (HMAC). 1646 */ 1647 if (!BUF_MEM_grow(s->init_buf, 1648 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH + 1649 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) 1650 return -1; 1651 senc = OPENSSL_malloc(slen); 1652 if (!senc) 1653 return -1; 1654 p = senc; 1655 i2d_SSL_SESSION(s->session, &p); 1656 1657 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]); 1658 EVP_CIPHER_CTX_init(&ctx); 1659 HMAC_CTX_init(&hctx); 1660 /* Initialize HMAC and cipher contexts. If callback present 1661 * it does all the work otherwise use generated values 1662 * from parent ctx. 1663 */ 1664 if (tctx->tlsext_ticket_key_cb) 1665 { 1666 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, 1667 &hctx, 1) < 0) 1668 { 1669 OPENSSL_free(senc); 1670 return -1; 1671 } 1672 } 1673 else 1674 { 1675 RAND_pseudo_bytes(iv, 16); 1676 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 1677 tctx->tlsext_tick_aes_key, iv); 1678 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, 1679 tlsext_tick_md(), NULL); 1680 memcpy(key_name, tctx->tlsext_tick_key_name, 16); 1681 } 1682 l2n(s->session->tlsext_tick_lifetime_hint, p); 1683 /* Skip ticket length for now */ 1684 p += 2; 1685 /* Output key name */ 1686 macstart = p; 1687 memcpy(p, key_name, 16); 1688 p += 16; 1689 /* output IV */ 1690 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx)); 1691 p += EVP_CIPHER_CTX_iv_length(&ctx); 1692 /* Encrypt session data */ 1693 EVP_EncryptUpdate(&ctx, p, &len, senc, slen); 1694 p += len; 1695 EVP_EncryptFinal(&ctx, p, &len); 1696 p += len; 1697 EVP_CIPHER_CTX_cleanup(&ctx); 1698 1699 HMAC_Update(&hctx, macstart, p - macstart); 1700 HMAC_Final(&hctx, p, &hlen); 1701 HMAC_CTX_cleanup(&hctx); 1702 1703 p += hlen; 1704 /* Now write out lengths: p points to end of data written */ 1705 /* Total length */ 1706 len = p - (unsigned char *)(s->init_buf->data); 1707 /* Ticket length */ 1708 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4; 1709 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p); 1710 1711 /* number of bytes to write */ 1712 s->init_num= len; 1713 s->state=SSL3_ST_SW_SESSION_TICKET_B; 1714 s->init_off=0; 1715 OPENSSL_free(senc); 1716 1717 /* XDTLS: set message header ? */ 1718 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1719 dtls1_set_message_header(s, (void *)s->init_buf->data, 1720 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len); 1721 1722 /* buffer the message to handle re-xmits */ 1723 dtls1_buffer_message(s, 0); 1724 } 1725 1726 /* SSL3_ST_SW_SESSION_TICKET_B */ 1727 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1728 } 1729 #endif 1730
