3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
6 /* ====================================================================
7 * Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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
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/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * openssl-core@OpenSSL.org.
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.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
62 * This package is an SSL implementation written
63 * by Eric Young (eay@cryptsoft.com).
64 * The implementation was written so as to conform with Netscapes SSL.
66 * This library is free for commercial and non-commercial use as long as
67 * the following conditions are aheared to. The following conditions
68 * apply to all code found in this distribution, be it the RC4, RSA,
69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
70 * included with this distribution is covered by the same copyright terms
71 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
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.
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
83 * 1. Redistributions of source code must retain the copyright
84 * notice, this list of conditions and the following disclaimer.
85 * 2. Redistributions in binary form must reproduce the above copyright
86 * notice, this list of conditions and the following disclaimer in the
87 * documentation and/or other materials provided with the distribution.
88 * 3. All advertising materials mentioning features or use of this software
89 * must display the following acknowledgement:
90 * "This product includes cryptographic software written by
91 * Eric Young (eay@cryptsoft.com)"
92 * The word 'cryptographic' can be left out if the rouines from the library
93 * being used are not cryptographic related :-).
94 * 4. If you include any Windows specific code (or a derivative thereof) from
95 * the apps directory (application code) you must include an acknowledgement:
96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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
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.]
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>
129 static const SSL_METHOD *dtls1_get_server_method(int ver);
130 static int dtls1_send_hello_verify_request(SSL *s);
132 static const SSL_METHOD *dtls1_get_server_method(int ver)
134 if (ver == DTLS1_VERSION)
135 return(DTLSv1_server_method());
136 else if (ver == DTLS1_2_VERSION)
137 return(DTLSv1_2_server_method());
142 IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
143 DTLSv1_server_method,
145 ssl_undefined_function,
146 dtls1_get_server_method,
149 IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
150 DTLSv1_2_server_method,
152 ssl_undefined_function,
153 dtls1_get_server_method,
156 int dtls1_accept(SSL *s)
159 unsigned long Time=(unsigned long)time(NULL);
160 void (*cb)(const SSL *ssl,int type,int val)=NULL;
163 int new_state,state,skip=0;
165 #ifndef OPENSSL_NO_SCTP
166 unsigned char sctpauthkey[64];
167 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
170 RAND_add(&Time,sizeof(Time),0);
174 if (s->info_callback != NULL)
176 else if (s->ctx->info_callback != NULL)
177 cb=s->ctx->info_callback;
179 listen = s->d1->listen;
181 /* init things to blank */
183 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
185 s->d1->listen = listen;
186 #ifndef OPENSSL_NO_SCTP
187 /* Notify SCTP BIO socket to enter handshake
188 * mode and prevent stream identifier other
189 * than 0. Will be ignored if no SCTP is used.
191 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
196 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
200 #ifndef OPENSSL_NO_HEARTBEATS
201 /* If we're awaiting a HeartbeatResponse, pretend we
202 * already got and don't await it anymore, because
203 * Heartbeats don't make sense during handshakes anyway.
205 if (s->tlsext_hb_pending)
208 s->tlsext_hb_pending = 0;
219 case SSL_ST_RENEGOTIATE:
221 /* s->state=SSL_ST_ACCEPT; */
225 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
226 case SSL_ST_OK|SSL_ST_ACCEPT:
229 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
231 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
233 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
236 s->type=SSL_ST_ACCEPT;
238 if (s->init_buf == NULL)
240 if ((buf=BUF_MEM_new()) == NULL)
245 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
253 if (!ssl3_setup_buffers(s))
261 if (s->state != SSL_ST_RENEGOTIATE)
263 /* Ok, we now need to push on a buffering BIO so that
264 * the output is sent in a way that TCP likes :-)
265 * ...but not with SCTP :-)
267 #ifndef OPENSSL_NO_SCTP
268 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
270 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
272 ssl3_init_finished_mac(s);
273 s->state=SSL3_ST_SR_CLNT_HELLO_A;
274 s->ctx->stats.sess_accept++;
278 /* s->state == SSL_ST_RENEGOTIATE,
279 * we will just send a HelloRequest */
280 s->ctx->stats.sess_accept_renegotiate++;
281 s->state=SSL3_ST_SW_HELLO_REQ_A;
286 case SSL3_ST_SW_HELLO_REQ_A:
287 case SSL3_ST_SW_HELLO_REQ_B:
290 dtls1_clear_record_buffer(s);
291 dtls1_start_timer(s);
292 ret=ssl3_send_hello_request(s);
293 if (ret <= 0) goto end;
294 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
295 s->state=SSL3_ST_SW_FLUSH;
298 ssl3_init_finished_mac(s);
301 case SSL3_ST_SW_HELLO_REQ_C:
305 case SSL3_ST_SR_CLNT_HELLO_A:
306 case SSL3_ST_SR_CLNT_HELLO_B:
307 case SSL3_ST_SR_CLNT_HELLO_C:
310 ret=ssl3_get_client_hello(s);
311 if (ret <= 0) goto end;
314 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
315 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
317 s->state = SSL3_ST_SW_SRVR_HELLO_A;
321 /* Reflect ClientHello sequence to remain stateless while listening */
324 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
327 /* If we're just listening, stop here */
328 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
332 /* Set expected sequence numbers
333 * to continue the handshake.
335 s->d1->handshake_read_seq = 2;
336 s->d1->handshake_write_seq = 1;
337 s->d1->next_handshake_write_seq = 1;
343 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
344 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
346 ret = dtls1_send_hello_verify_request(s);
347 if ( ret <= 0) goto end;
348 s->state=SSL3_ST_SW_FLUSH;
349 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
351 /* HelloVerifyRequest resets Finished MAC */
352 if (s->version != DTLS1_BAD_VER)
353 ssl3_init_finished_mac(s);
356 #ifndef OPENSSL_NO_SCTP
357 case DTLS1_SCTP_ST_SR_READ_SOCK:
359 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
361 s->s3->in_read_app_data=2;
362 s->rwstate=SSL_READING;
363 BIO_clear_retry_flags(SSL_get_rbio(s));
364 BIO_set_retry_read(SSL_get_rbio(s));
369 s->state=SSL3_ST_SR_FINISHED_A;
372 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
373 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
374 if (ret < 0) goto end;
378 if (s->d1->next_state != SSL_ST_OK)
380 s->s3->in_read_app_data=2;
381 s->rwstate=SSL_READING;
382 BIO_clear_retry_flags(SSL_get_rbio(s));
383 BIO_set_retry_read(SSL_get_rbio(s));
389 s->state=s->d1->next_state;
393 case SSL3_ST_SW_SRVR_HELLO_A:
394 case SSL3_ST_SW_SRVR_HELLO_B:
396 dtls1_start_timer(s);
397 ret=ssl3_send_server_hello(s);
398 if (ret <= 0) goto end;
402 #ifndef OPENSSL_NO_SCTP
403 /* Add new shared key for SCTP-Auth,
404 * will be ignored if no SCTP used.
406 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
407 DTLS1_SCTP_AUTH_LABEL);
409 SSL_export_keying_material(s, sctpauthkey,
410 sizeof(sctpauthkey), labelbuffer,
411 sizeof(labelbuffer), NULL, 0, 0);
413 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
414 sizeof(sctpauthkey), sctpauthkey);
416 #ifndef OPENSSL_NO_TLSEXT
417 if (s->tlsext_ticket_expected)
418 s->state=SSL3_ST_SW_SESSION_TICKET_A;
420 s->state=SSL3_ST_SW_CHANGE_A;
422 s->state=SSL3_ST_SW_CHANGE_A;
426 s->state=SSL3_ST_SW_CERT_A;
430 case SSL3_ST_SW_CERT_A:
431 case SSL3_ST_SW_CERT_B:
432 /* Check if it is anon DH or normal PSK */
433 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
434 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
436 dtls1_start_timer(s);
437 ret=ssl3_send_server_certificate(s);
438 if (ret <= 0) goto end;
439 #ifndef OPENSSL_NO_TLSEXT
440 if (s->tlsext_status_expected)
441 s->state=SSL3_ST_SW_CERT_STATUS_A;
443 s->state=SSL3_ST_SW_KEY_EXCH_A;
448 s->state=SSL3_ST_SW_KEY_EXCH_A;
455 s->state=SSL3_ST_SW_KEY_EXCH_A;
460 case SSL3_ST_SW_KEY_EXCH_A:
461 case SSL3_ST_SW_KEY_EXCH_B:
462 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
464 /* clear this, it may get reset by
465 * send_server_key_exchange */
466 if ((s->options & SSL_OP_EPHEMERAL_RSA)
467 #ifndef OPENSSL_NO_KRB5
468 && !(alg_k & SSL_kKRB5)
469 #endif /* OPENSSL_NO_KRB5 */
471 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
472 * even when forbidden by protocol specs
473 * (handshake may fail as clients are not required to
474 * be able to handle this) */
475 s->s3->tmp.use_rsa_tmp=1;
477 s->s3->tmp.use_rsa_tmp=0;
479 /* only send if a DH key exchange or
480 * RSA but we have a sign only certificate */
481 if (s->s3->tmp.use_rsa_tmp
482 /* PSK: send ServerKeyExchange if PSK identity
483 * hint if provided */
484 #ifndef OPENSSL_NO_PSK
485 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
487 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
488 || (alg_k & SSL_kEECDH)
489 || ((alg_k & SSL_kRSA)
490 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
491 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
492 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
498 dtls1_start_timer(s);
499 ret=ssl3_send_server_key_exchange(s);
500 if (ret <= 0) goto end;
505 s->state=SSL3_ST_SW_CERT_REQ_A;
509 case SSL3_ST_SW_CERT_REQ_A:
510 case SSL3_ST_SW_CERT_REQ_B:
511 if (/* don't request cert unless asked for it: */
512 !(s->verify_mode & SSL_VERIFY_PEER) ||
513 /* if SSL_VERIFY_CLIENT_ONCE is set,
514 * don't request cert during re-negotiation: */
515 ((s->session->peer != NULL) &&
516 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
517 /* never request cert in anonymous ciphersuites
518 * (see section "Certificate request" in SSL 3 drafts
519 * and in RFC 2246): */
520 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
521 /* ... except when the application insists on verification
522 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
523 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
524 /* never request cert in Kerberos ciphersuites */
525 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
526 /* With normal PSK Certificates and
527 * Certificate Requests are omitted */
528 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
530 /* no cert request */
532 s->s3->tmp.cert_request=0;
533 s->state=SSL3_ST_SW_SRVR_DONE_A;
534 #ifndef OPENSSL_NO_SCTP
535 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
537 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
538 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
544 s->s3->tmp.cert_request=1;
545 dtls1_start_timer(s);
546 ret=ssl3_send_certificate_request(s);
547 if (ret <= 0) goto end;
548 #ifndef NETSCAPE_HANG_BUG
549 s->state=SSL3_ST_SW_SRVR_DONE_A;
550 #ifndef OPENSSL_NO_SCTP
551 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
553 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
554 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
558 s->state=SSL3_ST_SW_FLUSH;
559 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
560 #ifndef OPENSSL_NO_SCTP
561 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
563 s->d1->next_state = s->s3->tmp.next_state;
564 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
572 case SSL3_ST_SW_SRVR_DONE_A:
573 case SSL3_ST_SW_SRVR_DONE_B:
574 dtls1_start_timer(s);
575 ret=ssl3_send_server_done(s);
576 if (ret <= 0) goto end;
577 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
578 s->state=SSL3_ST_SW_FLUSH;
582 case SSL3_ST_SW_FLUSH:
583 s->rwstate=SSL_WRITING;
584 if (BIO_flush(s->wbio) <= 0)
586 /* If the write error was fatal, stop trying */
587 if (!BIO_should_retry(s->wbio))
589 s->rwstate=SSL_NOTHING;
590 s->state=s->s3->tmp.next_state;
596 s->rwstate=SSL_NOTHING;
597 s->state=s->s3->tmp.next_state;
600 case SSL3_ST_SR_CERT_A:
601 case SSL3_ST_SR_CERT_B:
602 /* Check for second client hello (MS SGC) */
603 ret = ssl3_check_client_hello(s);
609 s->state = SSL3_ST_SR_CLNT_HELLO_C;
612 /* could be sent for a DH cert, even if we
613 * have not asked for it :-) */
614 ret=ssl3_get_client_certificate(s);
615 if (ret <= 0) goto end;
617 s->state=SSL3_ST_SR_KEY_EXCH_A;
621 case SSL3_ST_SR_KEY_EXCH_A:
622 case SSL3_ST_SR_KEY_EXCH_B:
623 ret=ssl3_get_client_key_exchange(s);
624 if (ret <= 0) goto end;
625 #ifndef OPENSSL_NO_SCTP
626 /* Add new shared key for SCTP-Auth,
627 * will be ignored if no SCTP used.
629 snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
630 DTLS1_SCTP_AUTH_LABEL);
632 SSL_export_keying_material(s, sctpauthkey,
633 sizeof(sctpauthkey), labelbuffer,
634 sizeof(labelbuffer), NULL, 0, 0);
636 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
637 sizeof(sctpauthkey), sctpauthkey);
640 s->state=SSL3_ST_SR_CERT_VRFY_A;
645 /* For the ECDH ciphersuites when
646 * the client sends its ECDH pub key in
647 * a certificate, the CertificateVerify
648 * message is not sent.
650 s->state=SSL3_ST_SR_FINISHED_A;
653 else if (SSL_USE_SIGALGS(s))
655 s->state=SSL3_ST_SR_CERT_VRFY_A;
657 if (!s->session->peer)
659 /* For sigalgs freeze the handshake buffer
660 * at this point and digest cached records.
662 if (!s->s3->handshake_buffer)
664 SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
667 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
668 if (!ssl3_digest_cached_records(s))
673 s->state=SSL3_ST_SR_CERT_VRFY_A;
676 /* We need to get hashes here so if there is
677 * a client cert, it can be verified */
678 s->method->ssl3_enc->cert_verify_mac(s,
680 &(s->s3->tmp.cert_verify_md[0]));
681 s->method->ssl3_enc->cert_verify_mac(s,
683 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
687 case SSL3_ST_SR_CERT_VRFY_A:
688 case SSL3_ST_SR_CERT_VRFY_B:
690 s->d1->change_cipher_spec_ok = 1;
691 /* we should decide if we expected this one */
692 ret=ssl3_get_cert_verify(s);
693 if (ret <= 0) goto end;
694 #ifndef OPENSSL_NO_SCTP
695 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
696 state == SSL_ST_RENEGOTIATE)
697 s->state=DTLS1_SCTP_ST_SR_READ_SOCK;
700 s->state=SSL3_ST_SR_FINISHED_A;
704 case SSL3_ST_SR_FINISHED_A:
705 case SSL3_ST_SR_FINISHED_B:
706 s->d1->change_cipher_spec_ok = 1;
707 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
708 SSL3_ST_SR_FINISHED_B);
709 if (ret <= 0) goto end;
713 #ifndef OPENSSL_NO_TLSEXT
714 else if (s->tlsext_ticket_expected)
715 s->state=SSL3_ST_SW_SESSION_TICKET_A;
718 s->state=SSL3_ST_SW_CHANGE_A;
722 #ifndef OPENSSL_NO_TLSEXT
723 case SSL3_ST_SW_SESSION_TICKET_A:
724 case SSL3_ST_SW_SESSION_TICKET_B:
725 ret=ssl3_send_newsession_ticket(s);
726 if (ret <= 0) goto end;
727 s->state=SSL3_ST_SW_CHANGE_A;
731 case SSL3_ST_SW_CERT_STATUS_A:
732 case SSL3_ST_SW_CERT_STATUS_B:
733 ret=ssl3_send_cert_status(s);
734 if (ret <= 0) goto end;
735 s->state=SSL3_ST_SW_KEY_EXCH_A;
741 case SSL3_ST_SW_CHANGE_A:
742 case SSL3_ST_SW_CHANGE_B:
744 s->session->cipher=s->s3->tmp.new_cipher;
745 if (!s->method->ssl3_enc->setup_key_block(s))
746 { ret= -1; goto end; }
748 ret=dtls1_send_change_cipher_spec(s,
749 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
751 if (ret <= 0) goto end;
753 #ifndef OPENSSL_NO_SCTP
754 /* Change to new shared key of SCTP-Auth,
755 * will be ignored if no SCTP used.
757 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
760 s->state=SSL3_ST_SW_FINISHED_A;
763 if (!s->method->ssl3_enc->change_cipher_state(s,
764 SSL3_CHANGE_CIPHER_SERVER_WRITE))
770 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
773 case SSL3_ST_SW_FINISHED_A:
774 case SSL3_ST_SW_FINISHED_B:
775 ret=ssl3_send_finished(s,
776 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
777 s->method->ssl3_enc->server_finished_label,
778 s->method->ssl3_enc->server_finished_label_len);
779 if (ret <= 0) goto end;
780 s->state=SSL3_ST_SW_FLUSH;
782 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
785 s->s3->tmp.next_state=SSL_ST_OK;
786 #ifndef OPENSSL_NO_SCTP
787 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
789 s->d1->next_state = s->s3->tmp.next_state;
790 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
798 /* clean a few things up */
799 ssl3_cleanup_key_block(s);
802 BUF_MEM_free(s->init_buf);
806 /* remove buffering on output */
807 ssl_free_wbio_buffer(s);
811 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
816 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
818 s->ctx->stats.sess_accept_good++;
820 s->handshake_func=dtls1_accept;
822 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
827 /* done handshaking, next message is client hello */
828 s->d1->handshake_read_seq = 0;
829 /* next message is server hello */
830 s->d1->handshake_write_seq = 0;
831 s->d1->next_handshake_write_seq = 0;
836 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
842 if (!s->s3->tmp.reuse_message && !skip)
846 if ((ret=BIO_flush(s->wbio)) <= 0)
851 if ((cb != NULL) && (s->state != state))
855 cb(s,SSL_CB_ACCEPT_LOOP,1);
862 /* BIO_flush(s->wbio); */
865 #ifndef OPENSSL_NO_SCTP
866 /* Notify SCTP BIO socket to leave handshake
867 * mode and prevent stream identifier other
868 * than 0. Will be ignored if no SCTP is used.
870 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
874 cb(s,SSL_CB_ACCEPT_EXIT,ret);
878 int dtls1_send_hello_verify_request(SSL *s)
880 unsigned int msg_len;
881 unsigned char *msg, *buf, *p;
883 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
885 buf = (unsigned char *)s->init_buf->data;
887 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
888 *(p++) = s->version >> 8;
889 *(p++) = s->version & 0xFF;
891 if (s->ctx->app_gen_cookie_cb == NULL ||
892 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
893 &(s->d1->cookie_len)) == 0)
895 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
899 *(p++) = (unsigned char) s->d1->cookie_len;
900 memcpy(p, s->d1->cookie, s->d1->cookie_len);
901 p += s->d1->cookie_len;
904 dtls1_set_message_header(s, buf,
905 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
907 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
908 /* number of bytes to write */
913 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
914 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));