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_start_timer(s); 280 ret=dtls1_send_hello_request(s); 281 if (ret <= 0) goto end; 282 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C; 283 s->state=SSL3_ST_SW_FLUSH; 284 s->init_num=0; 285 286 ssl3_init_finished_mac(s); 287 break; 288 289 case SSL3_ST_SW_HELLO_REQ_C: 290 s->state=SSL_ST_OK; 291 break; 292 293 case SSL3_ST_SR_CLNT_HELLO_A: 294 case SSL3_ST_SR_CLNT_HELLO_B: 295 case SSL3_ST_SR_CLNT_HELLO_C: 296 297 s->shutdown=0; 298 ret=ssl3_get_client_hello(s); 299 if (ret <= 0) goto end; 300 dtls1_stop_timer(s); 301 302 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 303 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 304 else 305 s->state = SSL3_ST_SW_SRVR_HELLO_A; 306 307 s->init_num=0; 308 309 /* Reflect ClientHello sequence to remain stateless while listening */ 310 if (listen) 311 { 312 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence)); 313 } 314 315 /* If we're just listening, stop here */ 316 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) 317 { 318 ret = 2; 319 s->d1->listen = 0; 320 /* Set expected sequence numbers 321 * to continue the handshake. 322 */ 323 s->d1->handshake_read_seq = 2; 324 s->d1->handshake_write_seq = 1; 325 s->d1->next_handshake_write_seq = 1; 326 goto end; 327 } 328 329 break; 330 331 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 332 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 333 334 ret = dtls1_send_hello_verify_request(s); 335 if ( ret <= 0) goto end; 336 s->state=SSL3_ST_SW_FLUSH; 337 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A; 338 339 /* HelloVerifyRequest resets Finished MAC */ 340 if (s->version != DTLS1_BAD_VER) 341 ssl3_init_finished_mac(s); 342 break; 343 344 #ifndef OPENSSL_NO_SCTP 345 case DTLS1_SCTP_ST_SR_READ_SOCK: 346 347 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) 348 { 349 s->s3->in_read_app_data=2; 350 s->rwstate=SSL_READING; 351 BIO_clear_retry_flags(SSL_get_rbio(s)); 352 BIO_set_retry_read(SSL_get_rbio(s)); 353 ret = -1; 354 goto end; 355 } 356 357 s->state=SSL3_ST_SR_FINISHED_A; 358 break; 359 360 case DTLS1_SCTP_ST_SW_WRITE_SOCK: 361 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 362 if (ret < 0) goto end; 363 364 if (ret == 0) 365 { 366 if (s->d1->next_state != SSL_ST_OK) 367 { 368 s->s3->in_read_app_data=2; 369 s->rwstate=SSL_READING; 370 BIO_clear_retry_flags(SSL_get_rbio(s)); 371 BIO_set_retry_read(SSL_get_rbio(s)); 372 ret = -1; 373 goto end; 374 } 375 } 376 377 s->state=s->d1->next_state; 378 break; 379 #endif 380 381 case SSL3_ST_SW_SRVR_HELLO_A: 382 case SSL3_ST_SW_SRVR_HELLO_B: 383 s->renegotiate = 2; 384 dtls1_start_timer(s); 385 ret=dtls1_send_server_hello(s); 386 if (ret <= 0) goto end; 387 388 if (s->hit) 389 { 390 #ifndef OPENSSL_NO_SCTP 391 /* Add new shared key for SCTP-Auth, 392 * will be ignored if no SCTP used. 393 */ 394 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 395 DTLS1_SCTP_AUTH_LABEL); 396 397 SSL_export_keying_material(s, sctpauthkey, 398 sizeof(sctpauthkey), labelbuffer, 399 sizeof(labelbuffer), NULL, 0, 0); 400 401 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 402 sizeof(sctpauthkey), sctpauthkey); 403 #endif 404 #ifndef OPENSSL_NO_TLSEXT 405 if (s->tlsext_ticket_expected) 406 s->state=SSL3_ST_SW_SESSION_TICKET_A; 407 else 408 s->state=SSL3_ST_SW_CHANGE_A; 409 #else 410 s->state=SSL3_ST_SW_CHANGE_A; 411 #endif 412 } 413 else 414 s->state=SSL3_ST_SW_CERT_A; 415 s->init_num=0; 416 break; 417 418 case SSL3_ST_SW_CERT_A: 419 case SSL3_ST_SW_CERT_B: 420 /* Check if it is anon DH or normal PSK */ 421 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 422 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 423 { 424 dtls1_start_timer(s); 425 ret=dtls1_send_server_certificate(s); 426 if (ret <= 0) goto end; 427 #ifndef OPENSSL_NO_TLSEXT 428 if (s->tlsext_status_expected) 429 s->state=SSL3_ST_SW_CERT_STATUS_A; 430 else 431 s->state=SSL3_ST_SW_KEY_EXCH_A; 432 } 433 else 434 { 435 skip = 1; 436 s->state=SSL3_ST_SW_KEY_EXCH_A; 437 } 438 #else 439 } 440 else 441 skip=1; 442 443 s->state=SSL3_ST_SW_KEY_EXCH_A; 444 #endif 445 s->init_num=0; 446 break; 447 448 case SSL3_ST_SW_KEY_EXCH_A: 449 case SSL3_ST_SW_KEY_EXCH_B: 450 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 451 452 /* clear this, it may get reset by 453 * send_server_key_exchange */ 454 if ((s->options & SSL_OP_EPHEMERAL_RSA) 455 #ifndef OPENSSL_NO_KRB5 456 && !(alg_k & SSL_kKRB5) 457 #endif /* OPENSSL_NO_KRB5 */ 458 ) 459 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key 460 * even when forbidden by protocol specs 461 * (handshake may fail as clients are not required to 462 * be able to handle this) */ 463 s->s3->tmp.use_rsa_tmp=1; 464 else 465 s->s3->tmp.use_rsa_tmp=0; 466 467 /* only send if a DH key exchange or 468 * RSA but we have a sign only certificate */ 469 if (s->s3->tmp.use_rsa_tmp 470 /* PSK: send ServerKeyExchange if PSK identity 471 * hint if provided */ 472 #ifndef OPENSSL_NO_PSK 473 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint) 474 #endif 475 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 476 || (alg_k & SSL_kEECDH) 477 || ((alg_k & SSL_kRSA) 478 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL 479 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) 480 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) 481 ) 482 ) 483 ) 484 ) 485 { 486 dtls1_start_timer(s); 487 ret=dtls1_send_server_key_exchange(s); 488 if (ret <= 0) goto end; 489 } 490 else 491 skip=1; 492 493 s->state=SSL3_ST_SW_CERT_REQ_A; 494 s->init_num=0; 495 break; 496 497 case SSL3_ST_SW_CERT_REQ_A: 498 case SSL3_ST_SW_CERT_REQ_B: 499 if (/* don't request cert unless asked for it: */ 500 !(s->verify_mode & SSL_VERIFY_PEER) || 501 /* if SSL_VERIFY_CLIENT_ONCE is set, 502 * don't request cert during re-negotiation: */ 503 ((s->session->peer != NULL) && 504 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 505 /* never request cert in anonymous ciphersuites 506 * (see section "Certificate request" in SSL 3 drafts 507 * and in RFC 2246): */ 508 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 509 /* ... except when the application insists on verification 510 * (against the specs, but s3_clnt.c accepts this for SSL 3) */ 511 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || 512 /* never request cert in Kerberos ciphersuites */ 513 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) 514 /* With normal PSK Certificates and 515 * Certificate Requests are omitted */ 516 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 517 { 518 /* no cert request */ 519 skip=1; 520 s->s3->tmp.cert_request=0; 521 s->state=SSL3_ST_SW_SRVR_DONE_A; 522 #ifndef OPENSSL_NO_SCTP 523 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 524 { 525 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 526 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 527 } 528 #endif 529 } 530 else 531 { 532 s->s3->tmp.cert_request=1; 533 dtls1_start_timer(s); 534 ret=dtls1_send_certificate_request(s); 535 if (ret <= 0) goto end; 536 #ifndef NETSCAPE_HANG_BUG 537 s->state=SSL3_ST_SW_SRVR_DONE_A; 538 #ifndef OPENSSL_NO_SCTP 539 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 540 { 541 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 542 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 543 } 544 #endif 545 #else 546 s->state=SSL3_ST_SW_FLUSH; 547 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 548 #ifndef OPENSSL_NO_SCTP 549 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 550 { 551 s->d1->next_state = s->s3->tmp.next_state; 552 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK; 553 } 554 #endif 555 #endif 556 s->init_num=0; 557 } 558 break; 559 560 case SSL3_ST_SW_SRVR_DONE_A: 561 case SSL3_ST_SW_SRVR_DONE_B: 562 dtls1_start_timer(s); 563 ret=dtls1_send_server_done(s); 564 if (ret <= 0) goto end; 565 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 566 s->state=SSL3_ST_SW_FLUSH; 567 s->init_num=0; 568 break; 569 570 case SSL3_ST_SW_FLUSH: 571 s->rwstate=SSL_WRITING; 572 if (BIO_flush(s->wbio) <= 0) 573 { 574 /* If the write error was fatal, stop trying */ 575 if (!BIO_should_retry(s->wbio)) 576 { 577 s->rwstate=SSL_NOTHING; 578 s->state=s->s3->tmp.next_state; 579 } 580 581 ret= -1; 582 goto end; 583 } 584 s->rwstate=SSL_NOTHING; 585 s->state=s->s3->tmp.next_state; 586 break; 587 588 case SSL3_ST_SR_CERT_A: 589 case SSL3_ST_SR_CERT_B: 590 /* Check for second client hello (MS SGC) */ 591 ret = ssl3_check_client_hello(s); 592 if (ret <= 0) 593 goto end; 594 if (ret == 2) 595 { 596 dtls1_stop_timer(s); 597 s->state = SSL3_ST_SR_CLNT_HELLO_C; 598 } 599 else { 600 /* could be sent for a DH cert, even if we 601 * have not asked for it :-) */ 602 ret=ssl3_get_client_certificate(s); 603 if (ret <= 0) goto end; 604 s->init_num=0; 605 s->state=SSL3_ST_SR_KEY_EXCH_A; 606 } 607 break; 608 609 case SSL3_ST_SR_KEY_EXCH_A: 610 case SSL3_ST_SR_KEY_EXCH_B: 611 ret=ssl3_get_client_key_exchange(s); 612 if (ret <= 0) goto end; 613 #ifndef OPENSSL_NO_SCTP 614 /* Add new shared key for SCTP-Auth, 615 * will be ignored if no SCTP used. 616 */ 617 snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 618 DTLS1_SCTP_AUTH_LABEL); 619 620 SSL_export_keying_material(s, sctpauthkey, 621 sizeof(sctpauthkey), labelbuffer, 622 sizeof(labelbuffer), NULL, 0, 0); 623 624 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 625 sizeof(sctpauthkey), sctpauthkey); 626 #endif 627 628 s->state=SSL3_ST_SR_CERT_VRFY_A; 629 s->init_num=0; 630 631 if (ret == 2) 632 { 633 /* For the ECDH ciphersuites when 634 * the client sends its ECDH pub key in 635 * a certificate, the CertificateVerify 636 * message is not sent. 637 */ 638 s->state=SSL3_ST_SR_FINISHED_A; 639 s->init_num = 0; 640 } 641 else 642 { 643 s->state=SSL3_ST_SR_CERT_VRFY_A; 644 s->init_num=0; 645 646 /* We need to get hashes here so if there is 647 * a client cert, it can be verified */ 648 s->method->ssl3_enc->cert_verify_mac(s, 649 NID_md5, 650 &(s->s3->tmp.cert_verify_md[0])); 651 s->method->ssl3_enc->cert_verify_mac(s, 652 NID_sha1, 653 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH])); 654 } 655 break; 656 657 case SSL3_ST_SR_CERT_VRFY_A: 658 case SSL3_ST_SR_CERT_VRFY_B: 659 660 s->d1->change_cipher_spec_ok = 1; 661 /* we should decide if we expected this one */ 662 ret=ssl3_get_cert_verify(s); 663 if (ret <= 0) goto end; 664 #ifndef OPENSSL_NO_SCTP 665 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 666 state == SSL_ST_RENEGOTIATE) 667 s->state=DTLS1_SCTP_ST_SR_READ_SOCK; 668 else 669 #endif 670 s->state=SSL3_ST_SR_FINISHED_A; 671 s->init_num=0; 672 break; 673 674 case SSL3_ST_SR_FINISHED_A: 675 case SSL3_ST_SR_FINISHED_B: 676 s->d1->change_cipher_spec_ok = 1; 677 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A, 678 SSL3_ST_SR_FINISHED_B); 679 if (ret <= 0) goto end; 680 dtls1_stop_timer(s); 681 if (s->hit) 682 s->state=SSL_ST_OK; 683 #ifndef OPENSSL_NO_TLSEXT 684 else if (s->tlsext_ticket_expected) 685 s->state=SSL3_ST_SW_SESSION_TICKET_A; 686 #endif 687 else 688 s->state=SSL3_ST_SW_CHANGE_A; 689 s->init_num=0; 690 break; 691 692 #ifndef OPENSSL_NO_TLSEXT 693 case SSL3_ST_SW_SESSION_TICKET_A: 694 case SSL3_ST_SW_SESSION_TICKET_B: 695 ret=dtls1_send_newsession_ticket(s); 696 if (ret <= 0) goto end; 697 s->state=SSL3_ST_SW_CHANGE_A; 698 s->init_num=0; 699 break; 700 701 case SSL3_ST_SW_CERT_STATUS_A: 702 case SSL3_ST_SW_CERT_STATUS_B: 703 ret=ssl3_send_cert_status(s); 704 if (ret <= 0) goto end; 705 s->state=SSL3_ST_SW_KEY_EXCH_A; 706 s->init_num=0; 707 break; 708 709 #endif 710 711 case SSL3_ST_SW_CHANGE_A: 712 case SSL3_ST_SW_CHANGE_B: 713 714 s->session->cipher=s->s3->tmp.new_cipher; 715 if (!s->method->ssl3_enc->setup_key_block(s)) 716 { ret= -1; goto end; } 717 718 ret=dtls1_send_change_cipher_spec(s, 719 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B); 720 721 if (ret <= 0) goto end; 722 723 #ifndef OPENSSL_NO_SCTP 724 /* Change to new shared key of SCTP-Auth, 725 * will be ignored if no SCTP used. 726 */ 727 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 728 #endif 729 730 s->state=SSL3_ST_SW_FINISHED_A; 731 s->init_num=0; 732 733 if (!s->method->ssl3_enc->change_cipher_state(s, 734 SSL3_CHANGE_CIPHER_SERVER_WRITE)) 735 { 736 ret= -1; 737 goto end; 738 } 739 740 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 741 break; 742 743 case SSL3_ST_SW_FINISHED_A: 744 case SSL3_ST_SW_FINISHED_B: 745 ret=dtls1_send_finished(s, 746 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B, 747 s->method->ssl3_enc->server_finished_label, 748 s->method->ssl3_enc->server_finished_label_len); 749 if (ret <= 0) goto end; 750 s->state=SSL3_ST_SW_FLUSH; 751 if (s->hit) 752 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A; 753 else 754 { 755 s->s3->tmp.next_state=SSL_ST_OK; 756 #ifndef OPENSSL_NO_SCTP 757 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 758 { 759 s->d1->next_state = s->s3->tmp.next_state; 760 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK; 761 } 762 #endif 763 } 764 s->init_num=0; 765 break; 766 767 case SSL_ST_OK: 768 /* clean a few things up */ 769 ssl3_cleanup_key_block(s); 770 771 #if 0 772 BUF_MEM_free(s->init_buf); 773 s->init_buf=NULL; 774 #endif 775 776 /* remove buffering on output */ 777 ssl_free_wbio_buffer(s); 778 779 s->init_num=0; 780 781 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */ 782 { 783 s->renegotiate=0; 784 s->new_session=0; 785 786 ssl_update_cache(s,SSL_SESS_CACHE_SERVER); 787 788 s->ctx->stats.sess_accept_good++; 789 /* s->server=1; */ 790 s->handshake_func=dtls1_accept; 791 792 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 793 } 794 795 ret = 1; 796 797 /* done handshaking, next message is client hello */ 798 s->d1->handshake_read_seq = 0; 799 /* next message is server hello */ 800 s->d1->handshake_write_seq = 0; 801 s->d1->next_handshake_write_seq = 0; 802 goto end; 803 /* break; */ 804 805 default: 806 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE); 807 ret= -1; 808 goto end; 809 /* break; */ 810 } 811 812 if (!s->s3->tmp.reuse_message && !skip) 813 { 814 if (s->debug) 815 { 816 if ((ret=BIO_flush(s->wbio)) <= 0) 817 goto end; 818 } 819 820 821 if ((cb != NULL) && (s->state != state)) 822 { 823 new_state=s->state; 824 s->state=state; 825 cb(s,SSL_CB_ACCEPT_LOOP,1); 826 s->state=new_state; 827 } 828 } 829 skip=0; 830 } 831 end: 832 /* BIO_flush(s->wbio); */ 833 834 s->in_handshake--; 835 #ifndef OPENSSL_NO_SCTP 836 /* Notify SCTP BIO socket to leave handshake 837 * mode and prevent stream identifier other 838 * than 0. Will be ignored if no SCTP is used. 839 */ 840 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL); 841 #endif 842 843 if (cb != NULL) 844 cb(s,SSL_CB_ACCEPT_EXIT,ret); 845 return(ret); 846 } 847 848 int dtls1_send_hello_request(SSL *s) 849 { 850 unsigned char *p; 851 852 if (s->state == SSL3_ST_SW_HELLO_REQ_A) 853 { 854 p=(unsigned char *)s->init_buf->data; 855 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0); 856 857 s->state=SSL3_ST_SW_HELLO_REQ_B; 858 /* number of bytes to write */ 859 s->init_num=DTLS1_HM_HEADER_LENGTH; 860 s->init_off=0; 861 862 /* no need to buffer this message, since there are no retransmit 863 * requests for it */ 864 } 865 866 /* SSL3_ST_SW_HELLO_REQ_B */ 867 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 868 } 869 870 int dtls1_send_hello_verify_request(SSL *s) 871 { 872 unsigned int msg_len; 873 unsigned char *msg, *buf, *p; 874 875 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) 876 { 877 buf = (unsigned char *)s->init_buf->data; 878 879 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 880 *(p++) = s->version >> 8; 881 *(p++) = s->version & 0xFF; 882 883 if (s->ctx->app_gen_cookie_cb == NULL || 884 s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 885 &(s->d1->cookie_len)) == 0) 886 { 887 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR); 888 return 0; 889 } 890 891 *(p++) = (unsigned char) s->d1->cookie_len; 892 memcpy(p, s->d1->cookie, s->d1->cookie_len); 893 p += s->d1->cookie_len; 894 msg_len = p - msg; 895 896 dtls1_set_message_header(s, buf, 897 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len); 898 899 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 900 /* number of bytes to write */ 901 s->init_num=p-buf; 902 s->init_off=0; 903 } 904 905 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 906 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 907 } 908 909 int dtls1_send_server_hello(SSL *s) 910 { 911 unsigned char *buf; 912 unsigned char *p,*d; 913 int i; 914 unsigned int sl; 915 unsigned long l,Time; 916 917 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) 918 { 919 buf=(unsigned char *)s->init_buf->data; 920 p=s->s3->server_random; 921 Time=(unsigned long)time(NULL); /* Time */ 922 l2n(Time,p); 923 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4); 924 /* Do the message type and length last */ 925 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 926 927 *(p++)=s->version>>8; 928 *(p++)=s->version&0xff; 929 930 /* Random stuff */ 931 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 932 p+=SSL3_RANDOM_SIZE; 933 934 /* now in theory we have 3 options to sending back the 935 * session id. If it is a re-use, we send back the 936 * old session-id, if it is a new session, we send 937 * back the new session-id or we send back a 0 length 938 * session-id if we want it to be single use. 939 * Currently I will not implement the '0' length session-id 940 * 12-Jan-98 - I'll now support the '0' length stuff. 941 */ 942 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) 943 s->session->session_id_length=0; 944 945 sl=s->session->session_id_length; 946 if (sl > sizeof s->session->session_id) 947 { 948 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 949 return -1; 950 } 951 *(p++)=sl; 952 memcpy(p,s->session->session_id,sl); 953 p+=sl; 954 955 /* put the cipher */ 956 if (s->s3->tmp.new_cipher == NULL) 957 return -1; 958 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p); 959 p+=i; 960 961 /* put the compression method */ 962 #ifdef OPENSSL_NO_COMP 963 *(p++)=0; 964 #else 965 if (s->s3->tmp.new_compression == NULL) 966 *(p++)=0; 967 else 968 *(p++)=s->s3->tmp.new_compression->id; 969 #endif 970 971 #ifndef OPENSSL_NO_TLSEXT 972 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 973 { 974 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR); 975 return -1; 976 } 977 #endif 978 979 /* do the header */ 980 l=(p-d); 981 d=buf; 982 983 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l); 984 985 s->state=SSL3_ST_SW_SRVR_HELLO_B; 986 /* number of bytes to write */ 987 s->init_num=p-buf; 988 s->init_off=0; 989 990 /* buffer the message to handle re-xmits */ 991 dtls1_buffer_message(s, 0); 992 } 993 994 /* SSL3_ST_SW_SRVR_HELLO_B */ 995 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 996 } 997 998 int dtls1_send_server_done(SSL *s) 999 { 1000 unsigned char *p; 1001 1002 if (s->state == SSL3_ST_SW_SRVR_DONE_A) 1003 { 1004 p=(unsigned char *)s->init_buf->data; 1005 1006 /* do the header */ 1007 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0); 1008 1009 s->state=SSL3_ST_SW_SRVR_DONE_B; 1010 /* number of bytes to write */ 1011 s->init_num=DTLS1_HM_HEADER_LENGTH; 1012 s->init_off=0; 1013 1014 /* buffer the message to handle re-xmits */ 1015 dtls1_buffer_message(s, 0); 1016 } 1017 1018 /* SSL3_ST_SW_SRVR_DONE_B */ 1019 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1020 } 1021 1022 int dtls1_send_server_key_exchange(SSL *s) 1023 { 1024 #ifndef OPENSSL_NO_RSA 1025 unsigned char *q; 1026 int j,num; 1027 RSA *rsa; 1028 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1029 unsigned int u; 1030 #endif 1031 #ifndef OPENSSL_NO_DH 1032 DH *dh=NULL,*dhp; 1033 #endif 1034 #ifndef OPENSSL_NO_ECDH 1035 EC_KEY *ecdh=NULL, *ecdhp; 1036 unsigned char *encodedPoint = NULL; 1037 int encodedlen = 0; 1038 int curve_id = 0; 1039 BN_CTX *bn_ctx = NULL; 1040 #endif 1041 EVP_PKEY *pkey; 1042 unsigned char *p,*d; 1043 int al,i; 1044 unsigned long type; 1045 int n; 1046 CERT *cert; 1047 BIGNUM *r[4]; 1048 int nr[4],kn; 1049 BUF_MEM *buf; 1050 EVP_MD_CTX md_ctx; 1051 1052 EVP_MD_CTX_init(&md_ctx); 1053 if (s->state == SSL3_ST_SW_KEY_EXCH_A) 1054 { 1055 type=s->s3->tmp.new_cipher->algorithm_mkey; 1056 cert=s->cert; 1057 1058 buf=s->init_buf; 1059 1060 r[0]=r[1]=r[2]=r[3]=NULL; 1061 n=0; 1062 #ifndef OPENSSL_NO_RSA 1063 if (type & SSL_kRSA) 1064 { 1065 rsa=cert->rsa_tmp; 1066 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) 1067 { 1068 rsa=s->cert->rsa_tmp_cb(s, 1069 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1070 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1071 if(rsa == NULL) 1072 { 1073 al=SSL_AD_HANDSHAKE_FAILURE; 1074 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY); 1075 goto f_err; 1076 } 1077 RSA_up_ref(rsa); 1078 cert->rsa_tmp=rsa; 1079 } 1080 if (rsa == NULL) 1081 { 1082 al=SSL_AD_HANDSHAKE_FAILURE; 1083 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY); 1084 goto f_err; 1085 } 1086 r[0]=rsa->n; 1087 r[1]=rsa->e; 1088 s->s3->tmp.use_rsa_tmp=1; 1089 } 1090 else 1091 #endif 1092 #ifndef OPENSSL_NO_DH 1093 if (type & SSL_kEDH) 1094 { 1095 dhp=cert->dh_tmp; 1096 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) 1097 dhp=s->cert->dh_tmp_cb(s, 1098 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1099 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1100 if (dhp == NULL) 1101 { 1102 al=SSL_AD_HANDSHAKE_FAILURE; 1103 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY); 1104 goto f_err; 1105 } 1106 1107 if (s->s3->tmp.dh != NULL) 1108 { 1109 DH_free(dh); 1110 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1111 goto err; 1112 } 1113 1114 if ((dh=DHparams_dup(dhp)) == NULL) 1115 { 1116 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 1117 goto err; 1118 } 1119 1120 s->s3->tmp.dh=dh; 1121 if ((dhp->pub_key == NULL || 1122 dhp->priv_key == NULL || 1123 (s->options & SSL_OP_SINGLE_DH_USE))) 1124 { 1125 if(!DH_generate_key(dh)) 1126 { 1127 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1128 ERR_R_DH_LIB); 1129 goto err; 1130 } 1131 } 1132 else 1133 { 1134 dh->pub_key=BN_dup(dhp->pub_key); 1135 dh->priv_key=BN_dup(dhp->priv_key); 1136 if ((dh->pub_key == NULL) || 1137 (dh->priv_key == NULL)) 1138 { 1139 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 1140 goto err; 1141 } 1142 } 1143 r[0]=dh->p; 1144 r[1]=dh->g; 1145 r[2]=dh->pub_key; 1146 } 1147 else 1148 #endif 1149 #ifndef OPENSSL_NO_ECDH 1150 if (type & SSL_kEECDH) 1151 { 1152 const EC_GROUP *group; 1153 1154 ecdhp=cert->ecdh_tmp; 1155 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL)) 1156 { 1157 ecdhp=s->cert->ecdh_tmp_cb(s, 1158 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1159 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1160 } 1161 if (ecdhp == NULL) 1162 { 1163 al=SSL_AD_HANDSHAKE_FAILURE; 1164 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY); 1165 goto f_err; 1166 } 1167 1168 if (s->s3->tmp.ecdh != NULL) 1169 { 1170 EC_KEY_free(s->s3->tmp.ecdh); 1171 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1172 goto err; 1173 } 1174 1175 /* Duplicate the ECDH structure. */ 1176 if (ecdhp == NULL) 1177 { 1178 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1179 goto err; 1180 } 1181 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) 1182 { 1183 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1184 goto err; 1185 } 1186 1187 s->s3->tmp.ecdh=ecdh; 1188 if ((EC_KEY_get0_public_key(ecdh) == NULL) || 1189 (EC_KEY_get0_private_key(ecdh) == NULL) || 1190 (s->options & SSL_OP_SINGLE_ECDH_USE)) 1191 { 1192 if(!EC_KEY_generate_key(ecdh)) 1193 { 1194 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1195 goto err; 1196 } 1197 } 1198 1199 if (((group = EC_KEY_get0_group(ecdh)) == NULL) || 1200 (EC_KEY_get0_public_key(ecdh) == NULL) || 1201 (EC_KEY_get0_private_key(ecdh) == NULL)) 1202 { 1203 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1204 goto err; 1205 } 1206 1207 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 1208 (EC_GROUP_get_degree(group) > 163)) 1209 { 1210 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER); 1211 goto err; 1212 } 1213 1214 /* XXX: For now, we only support ephemeral ECDH 1215 * keys over named (not generic) curves. For 1216 * supported named curves, curve_id is non-zero. 1217 */ 1218 if ((curve_id = 1219 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group))) 1220 == 0) 1221 { 1222 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1223 goto err; 1224 } 1225 1226 /* Encode the public key. 1227 * First check the size of encoding and 1228 * allocate memory accordingly. 1229 */ 1230 encodedlen = EC_POINT_point2oct(group, 1231 EC_KEY_get0_public_key(ecdh), 1232 POINT_CONVERSION_UNCOMPRESSED, 1233 NULL, 0, NULL); 1234 1235 encodedPoint = (unsigned char *) 1236 OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 1237 bn_ctx = BN_CTX_new(); 1238 if ((encodedPoint == NULL) || (bn_ctx == NULL)) 1239 { 1240 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1241 goto err; 1242 } 1243 1244 1245 encodedlen = EC_POINT_point2oct(group, 1246 EC_KEY_get0_public_key(ecdh), 1247 POINT_CONVERSION_UNCOMPRESSED, 1248 encodedPoint, encodedlen, bn_ctx); 1249 1250 if (encodedlen == 0) 1251 { 1252 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1253 goto err; 1254 } 1255 1256 BN_CTX_free(bn_ctx); bn_ctx=NULL; 1257 1258 /* XXX: For now, we only support named (not 1259 * generic) curves in ECDH ephemeral key exchanges. 1260 * In this situation, we need four additional bytes 1261 * to encode the entire ServerECDHParams 1262 * structure. 1263 */ 1264 n = 4 + encodedlen; 1265 1266 /* We'll generate the serverKeyExchange message 1267 * explicitly so we can set these to NULLs 1268 */ 1269 r[0]=NULL; 1270 r[1]=NULL; 1271 r[2]=NULL; 1272 r[3]=NULL; 1273 } 1274 else 1275 #endif /* !OPENSSL_NO_ECDH */ 1276 #ifndef OPENSSL_NO_PSK 1277 if (type & SSL_kPSK) 1278 { 1279 /* reserve size for record length and PSK identity hint*/ 1280 n+=2+strlen(s->ctx->psk_identity_hint); 1281 } 1282 else 1283 #endif /* !OPENSSL_NO_PSK */ 1284 { 1285 al=SSL_AD_HANDSHAKE_FAILURE; 1286 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1287 goto f_err; 1288 } 1289 for (i=0; r[i] != NULL; i++) 1290 { 1291 nr[i]=BN_num_bytes(r[i]); 1292 n+=2+nr[i]; 1293 } 1294 1295 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 1296 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 1297 { 1298 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL)) 1299 == NULL) 1300 { 1301 al=SSL_AD_DECODE_ERROR; 1302 goto f_err; 1303 } 1304 kn=EVP_PKEY_size(pkey); 1305 } 1306 else 1307 { 1308 pkey=NULL; 1309 kn=0; 1310 } 1311 1312 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn)) 1313 { 1314 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF); 1315 goto err; 1316 } 1317 d=(unsigned char *)s->init_buf->data; 1318 p= &(d[DTLS1_HM_HEADER_LENGTH]); 1319 1320 for (i=0; r[i] != NULL; i++) 1321 { 1322 s2n(nr[i],p); 1323 BN_bn2bin(r[i],p); 1324 p+=nr[i]; 1325 } 1326 1327 #ifndef OPENSSL_NO_ECDH 1328 if (type & SSL_kEECDH) 1329 { 1330 /* XXX: For now, we only support named (not generic) curves. 1331 * In this situation, the serverKeyExchange message has: 1332 * [1 byte CurveType], [2 byte CurveName] 1333 * [1 byte length of encoded point], followed by 1334 * the actual encoded point itself 1335 */ 1336 *p = NAMED_CURVE_TYPE; 1337 p += 1; 1338 *p = 0; 1339 p += 1; 1340 *p = curve_id; 1341 p += 1; 1342 *p = encodedlen; 1343 p += 1; 1344 memcpy((unsigned char*)p, 1345 (unsigned char *)encodedPoint, 1346 encodedlen); 1347 OPENSSL_free(encodedPoint); 1348 p += encodedlen; 1349 } 1350 #endif 1351 1352 #ifndef OPENSSL_NO_PSK 1353 if (type & SSL_kPSK) 1354 { 1355 /* copy PSK identity hint */ 1356 s2n(strlen(s->ctx->psk_identity_hint), p); 1357 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint)); 1358 p+=strlen(s->ctx->psk_identity_hint); 1359 } 1360 #endif 1361 1362 /* not anonymous */ 1363 if (pkey != NULL) 1364 { 1365 /* n is the length of the params, they start at 1366 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space 1367 * at the end. */ 1368 #ifndef OPENSSL_NO_RSA 1369 if (pkey->type == EVP_PKEY_RSA) 1370 { 1371 q=md_buf; 1372 j=0; 1373 for (num=2; num > 0; num--) 1374 { 1375 EVP_DigestInit_ex(&md_ctx,(num == 2) 1376 ?s->ctx->md5:s->ctx->sha1, NULL); 1377 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1378 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1379 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1380 EVP_DigestFinal_ex(&md_ctx,q, 1381 (unsigned int *)&i); 1382 q+=i; 1383 j+=i; 1384 } 1385 if (RSA_sign(NID_md5_sha1, md_buf, j, 1386 &(p[2]), &u, pkey->pkey.rsa) <= 0) 1387 { 1388 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA); 1389 goto err; 1390 } 1391 s2n(u,p); 1392 n+=u+2; 1393 } 1394 else 1395 #endif 1396 #if !defined(OPENSSL_NO_DSA) 1397 if (pkey->type == EVP_PKEY_DSA) 1398 { 1399 /* lets do DSS */ 1400 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL); 1401 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1402 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1403 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1404 if (!EVP_SignFinal(&md_ctx,&(p[2]), 1405 (unsigned int *)&i,pkey)) 1406 { 1407 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA); 1408 goto err; 1409 } 1410 s2n(i,p); 1411 n+=i+2; 1412 } 1413 else 1414 #endif 1415 #if !defined(OPENSSL_NO_ECDSA) 1416 if (pkey->type == EVP_PKEY_EC) 1417 { 1418 /* let's do ECDSA */ 1419 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL); 1420 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1421 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1422 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1423 if (!EVP_SignFinal(&md_ctx,&(p[2]), 1424 (unsigned int *)&i,pkey)) 1425 { 1426 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA); 1427 goto err; 1428 } 1429 s2n(i,p); 1430 n+=i+2; 1431 } 1432 else 1433 #endif 1434 { 1435 /* Is this error check actually needed? */ 1436 al=SSL_AD_HANDSHAKE_FAILURE; 1437 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE); 1438 goto f_err; 1439 } 1440 } 1441 1442 d = dtls1_set_message_header(s, d, 1443 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n); 1444 1445 /* we should now have things packed up, so lets send 1446 * it off */ 1447 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1448 s->init_off=0; 1449 1450 /* buffer the message to handle re-xmits */ 1451 dtls1_buffer_message(s, 0); 1452 } 1453 1454 s->state = SSL3_ST_SW_KEY_EXCH_B; 1455 EVP_MD_CTX_cleanup(&md_ctx); 1456 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1457 f_err: 1458 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1459 err: 1460 #ifndef OPENSSL_NO_ECDH 1461 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1462 BN_CTX_free(bn_ctx); 1463 #endif 1464 EVP_MD_CTX_cleanup(&md_ctx); 1465 return(-1); 1466 } 1467 1468 int dtls1_send_certificate_request(SSL *s) 1469 { 1470 unsigned char *p,*d; 1471 int i,j,nl,off,n; 1472 STACK_OF(X509_NAME) *sk=NULL; 1473 X509_NAME *name; 1474 BUF_MEM *buf; 1475 unsigned int msg_len; 1476 1477 if (s->state == SSL3_ST_SW_CERT_REQ_A) 1478 { 1479 buf=s->init_buf; 1480 1481 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); 1482 1483 /* get the list of acceptable cert types */ 1484 p++; 1485 n=ssl3_get_req_cert_type(s,p); 1486 d[0]=n; 1487 p+=n; 1488 n++; 1489 1490 off=n; 1491 p+=2; 1492 n+=2; 1493 1494 sk=SSL_get_client_CA_list(s); 1495 nl=0; 1496 if (sk != NULL) 1497 { 1498 for (i=0; i<sk_X509_NAME_num(sk); i++) 1499 { 1500 name=sk_X509_NAME_value(sk,i); 1501 j=i2d_X509_NAME(name,NULL); 1502 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2)) 1503 { 1504 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB); 1505 goto err; 1506 } 1507 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]); 1508 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) 1509 { 1510 s2n(j,p); 1511 i2d_X509_NAME(name,&p); 1512 n+=2+j; 1513 nl+=2+j; 1514 } 1515 else 1516 { 1517 d=p; 1518 i2d_X509_NAME(name,&p); 1519 j-=2; s2n(j,d); j+=2; 1520 n+=j; 1521 nl+=j; 1522 } 1523 } 1524 } 1525 /* else no CA names */ 1526 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]); 1527 s2n(nl,p); 1528 1529 d=(unsigned char *)buf->data; 1530 *(d++)=SSL3_MT_CERTIFICATE_REQUEST; 1531 l2n3(n,d); 1532 s2n(s->d1->handshake_write_seq,d); 1533 s->d1->handshake_write_seq++; 1534 1535 /* we should now have things packed up, so lets send 1536 * it off */ 1537 1538 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1539 s->init_off=0; 1540 #ifdef NETSCAPE_HANG_BUG 1541 /* XXX: what to do about this? */ 1542 p=(unsigned char *)s->init_buf->data + s->init_num; 1543 1544 /* do the header */ 1545 *(p++)=SSL3_MT_SERVER_DONE; 1546 *(p++)=0; 1547 *(p++)=0; 1548 *(p++)=0; 1549 s->init_num += 4; 1550 #endif 1551 1552 /* XDTLS: set message header ? */ 1553 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1554 dtls1_set_message_header(s, (void *)s->init_buf->data, 1555 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len); 1556 1557 /* buffer the message to handle re-xmits */ 1558 dtls1_buffer_message(s, 0); 1559 1560 s->state = SSL3_ST_SW_CERT_REQ_B; 1561 } 1562 1563 /* SSL3_ST_SW_CERT_REQ_B */ 1564 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1565 err: 1566 return(-1); 1567 } 1568 1569 int dtls1_send_server_certificate(SSL *s) 1570 { 1571 unsigned long l; 1572 X509 *x; 1573 1574 if (s->state == SSL3_ST_SW_CERT_A) 1575 { 1576 x=ssl_get_server_send_cert(s); 1577 if (x == NULL) 1578 { 1579 /* VRS: allow null cert if auth == KRB5 */ 1580 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) || 1581 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5)) 1582 { 1583 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR); 1584 return(0); 1585 } 1586 } 1587 1588 l=dtls1_output_cert_chain(s,x); 1589 s->state=SSL3_ST_SW_CERT_B; 1590 s->init_num=(int)l; 1591 s->init_off=0; 1592 1593 /* buffer the message to handle re-xmits */ 1594 dtls1_buffer_message(s, 0); 1595 } 1596 1597 /* SSL3_ST_SW_CERT_B */ 1598 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1599 } 1600 1601 #ifndef OPENSSL_NO_TLSEXT 1602 int dtls1_send_newsession_ticket(SSL *s) 1603 { 1604 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) 1605 { 1606 unsigned char *p, *senc, *macstart; 1607 int len, slen; 1608 unsigned int hlen, msg_len; 1609 EVP_CIPHER_CTX ctx; 1610 HMAC_CTX hctx; 1611 SSL_CTX *tctx = s->initial_ctx; 1612 unsigned char iv[EVP_MAX_IV_LENGTH]; 1613 unsigned char key_name[16]; 1614 1615 /* get session encoding length */ 1616 slen = i2d_SSL_SESSION(s->session, NULL); 1617 /* Some length values are 16 bits, so forget it if session is 1618 * too long 1619 */ 1620 if (slen > 0xFF00) 1621 return -1; 1622 /* Grow buffer if need be: the length calculation is as 1623 * follows 12 (DTLS handshake message header) + 1624 * 4 (ticket lifetime hint) + 2 (ticket length) + 1625 * 16 (key name) + max_iv_len (iv length) + 1626 * session_length + max_enc_block_size (max encrypted session 1627 * length) + max_md_size (HMAC). 1628 */ 1629 if (!BUF_MEM_grow(s->init_buf, 1630 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH + 1631 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) 1632 return -1; 1633 senc = OPENSSL_malloc(slen); 1634 if (!senc) 1635 return -1; 1636 p = senc; 1637 i2d_SSL_SESSION(s->session, &p); 1638 1639 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]); 1640 EVP_CIPHER_CTX_init(&ctx); 1641 HMAC_CTX_init(&hctx); 1642 /* Initialize HMAC and cipher contexts. If callback present 1643 * it does all the work otherwise use generated values 1644 * from parent ctx. 1645 */ 1646 if (tctx->tlsext_ticket_key_cb) 1647 { 1648 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, 1649 &hctx, 1) < 0) 1650 { 1651 OPENSSL_free(senc); 1652 return -1; 1653 } 1654 } 1655 else 1656 { 1657 RAND_pseudo_bytes(iv, 16); 1658 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 1659 tctx->tlsext_tick_aes_key, iv); 1660 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, 1661 tlsext_tick_md(), NULL); 1662 memcpy(key_name, tctx->tlsext_tick_key_name, 16); 1663 } 1664 l2n(s->session->tlsext_tick_lifetime_hint, p); 1665 /* Skip ticket length for now */ 1666 p += 2; 1667 /* Output key name */ 1668 macstart = p; 1669 memcpy(p, key_name, 16); 1670 p += 16; 1671 /* output IV */ 1672 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx)); 1673 p += EVP_CIPHER_CTX_iv_length(&ctx); 1674 /* Encrypt session data */ 1675 EVP_EncryptUpdate(&ctx, p, &len, senc, slen); 1676 p += len; 1677 EVP_EncryptFinal(&ctx, p, &len); 1678 p += len; 1679 EVP_CIPHER_CTX_cleanup(&ctx); 1680 1681 HMAC_Update(&hctx, macstart, p - macstart); 1682 HMAC_Final(&hctx, p, &hlen); 1683 HMAC_CTX_cleanup(&hctx); 1684 1685 p += hlen; 1686 /* Now write out lengths: p points to end of data written */ 1687 /* Total length */ 1688 len = p - (unsigned char *)(s->init_buf->data); 1689 /* Ticket length */ 1690 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4; 1691 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p); 1692 1693 /* number of bytes to write */ 1694 s->init_num= len; 1695 s->state=SSL3_ST_SW_SESSION_TICKET_B; 1696 s->init_off=0; 1697 OPENSSL_free(senc); 1698 1699 /* XDTLS: set message header ? */ 1700 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1701 dtls1_set_message_header(s, (void *)s->init_buf->data, 1702 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len); 1703 1704 /* buffer the message to handle re-xmits */ 1705 dtls1_buffer_message(s, 0); 1706 } 1707 1708 /* SSL3_ST_SW_SESSION_TICKET_B */ 1709 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1710 } 1711 #endif 1712
