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 IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
159 ssl_undefined_function,
160 dtls1_get_server_method,
163 int dtls1_accept(SSL *s)
166 unsigned long Time=(unsigned long)time(NULL);
167 void (*cb)(const SSL *ssl,int type,int val)=NULL;
170 int new_state,state,skip=0;
172 #ifndef OPENSSL_NO_SCTP
173 unsigned char sctpauthkey[64];
174 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
177 RAND_add(&Time,sizeof(Time),0);
181 if (s->info_callback != NULL)
183 else if (s->ctx->info_callback != NULL)
184 cb=s->ctx->info_callback;
186 listen = s->d1->listen;
188 /* init things to blank */
190 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
192 s->d1->listen = listen;
193 #ifndef OPENSSL_NO_SCTP
194 /* Notify SCTP BIO socket to enter handshake
195 * mode and prevent stream identifier other
196 * than 0. Will be ignored if no SCTP is used.
198 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
203 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
207 #ifndef OPENSSL_NO_HEARTBEATS
208 /* If we're awaiting a HeartbeatResponse, pretend we
209 * already got and don't await it anymore, because
210 * Heartbeats don't make sense during handshakes anyway.
212 if (s->tlsext_hb_pending)
215 s->tlsext_hb_pending = 0;
226 case SSL_ST_RENEGOTIATE:
228 /* s->state=SSL_ST_ACCEPT; */
232 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
233 case SSL_ST_OK|SSL_ST_ACCEPT:
236 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
238 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
240 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
243 s->type=SSL_ST_ACCEPT;
245 if (s->init_buf == NULL)
247 if ((buf=BUF_MEM_new()) == NULL)
252 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
260 if (!ssl3_setup_buffers(s))
268 if (s->state != SSL_ST_RENEGOTIATE)
270 /* Ok, we now need to push on a buffering BIO so that
271 * the output is sent in a way that TCP likes :-)
272 * ...but not with SCTP :-)
274 #ifndef OPENSSL_NO_SCTP
275 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
277 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
279 ssl3_init_finished_mac(s);
280 s->state=SSL3_ST_SR_CLNT_HELLO_A;
281 s->ctx->stats.sess_accept++;
285 /* s->state == SSL_ST_RENEGOTIATE,
286 * we will just send a HelloRequest */
287 s->ctx->stats.sess_accept_renegotiate++;
288 s->state=SSL3_ST_SW_HELLO_REQ_A;
293 case SSL3_ST_SW_HELLO_REQ_A:
294 case SSL3_ST_SW_HELLO_REQ_B:
297 dtls1_start_timer(s);
298 ret=ssl3_send_hello_request(s);
299 if (ret <= 0) goto end;
300 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
301 s->state=SSL3_ST_SW_FLUSH;
304 ssl3_init_finished_mac(s);
307 case SSL3_ST_SW_HELLO_REQ_C:
311 case SSL3_ST_SR_CLNT_HELLO_A:
312 case SSL3_ST_SR_CLNT_HELLO_B:
313 case SSL3_ST_SR_CLNT_HELLO_C:
316 ret=ssl3_get_client_hello(s);
317 if (ret <= 0) goto end;
320 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
321 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
323 s->state = SSL3_ST_SW_SRVR_HELLO_A;
327 /* Reflect ClientHello sequence to remain stateless while listening */
330 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
333 /* If we're just listening, stop here */
334 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
338 /* Set expected sequence numbers
339 * to continue the handshake.
341 s->d1->handshake_read_seq = 2;
342 s->d1->handshake_write_seq = 1;
343 s->d1->next_handshake_write_seq = 1;
349 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
350 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
352 ret = dtls1_send_hello_verify_request(s);
353 if ( ret <= 0) goto end;
354 s->state=SSL3_ST_SW_FLUSH;
355 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
357 /* HelloVerifyRequest resets Finished MAC */
358 if (s->version != DTLS1_BAD_VER)
359 ssl3_init_finished_mac(s);
362 #ifndef OPENSSL_NO_SCTP
363 case DTLS1_SCTP_ST_SR_READ_SOCK:
365 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
367 s->s3->in_read_app_data=2;
368 s->rwstate=SSL_READING;
369 BIO_clear_retry_flags(SSL_get_rbio(s));
370 BIO_set_retry_read(SSL_get_rbio(s));
375 s->state=SSL3_ST_SR_FINISHED_A;
378 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
379 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
380 if (ret < 0) goto end;
384 if (s->d1->next_state != SSL_ST_OK)
386 s->s3->in_read_app_data=2;
387 s->rwstate=SSL_READING;
388 BIO_clear_retry_flags(SSL_get_rbio(s));
389 BIO_set_retry_read(SSL_get_rbio(s));
395 s->state=s->d1->next_state;
399 case SSL3_ST_SW_SRVR_HELLO_A:
400 case SSL3_ST_SW_SRVR_HELLO_B:
402 dtls1_start_timer(s);
403 ret=ssl3_send_server_hello(s);
404 if (ret <= 0) goto end;
408 #ifndef OPENSSL_NO_SCTP
409 /* Add new shared key for SCTP-Auth,
410 * will be ignored if no SCTP used.
412 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
413 DTLS1_SCTP_AUTH_LABEL);
415 SSL_export_keying_material(s, sctpauthkey,
416 sizeof(sctpauthkey), labelbuffer,
417 sizeof(labelbuffer), NULL, 0, 0);
419 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
420 sizeof(sctpauthkey), sctpauthkey);
422 #ifndef OPENSSL_NO_TLSEXT
423 if (s->tlsext_ticket_expected)
424 s->state=SSL3_ST_SW_SESSION_TICKET_A;
426 s->state=SSL3_ST_SW_CHANGE_A;
428 s->state=SSL3_ST_SW_CHANGE_A;
432 s->state=SSL3_ST_SW_CERT_A;
436 case SSL3_ST_SW_CERT_A:
437 case SSL3_ST_SW_CERT_B:
438 /* Check if it is anon DH or normal PSK */
439 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
440 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
442 dtls1_start_timer(s);
443 ret=ssl3_send_server_certificate(s);
444 if (ret <= 0) goto end;
445 #ifndef OPENSSL_NO_TLSEXT
446 if (s->tlsext_status_expected)
447 s->state=SSL3_ST_SW_CERT_STATUS_A;
449 s->state=SSL3_ST_SW_KEY_EXCH_A;
454 s->state=SSL3_ST_SW_KEY_EXCH_A;
461 s->state=SSL3_ST_SW_KEY_EXCH_A;
466 case SSL3_ST_SW_KEY_EXCH_A:
467 case SSL3_ST_SW_KEY_EXCH_B:
468 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
470 /* clear this, it may get reset by
471 * send_server_key_exchange */
472 if ((s->options & SSL_OP_EPHEMERAL_RSA)
473 #ifndef OPENSSL_NO_KRB5
474 && !(alg_k & SSL_kKRB5)
475 #endif /* OPENSSL_NO_KRB5 */
477 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
478 * even when forbidden by protocol specs
479 * (handshake may fail as clients are not required to
480 * be able to handle this) */
481 s->s3->tmp.use_rsa_tmp=1;
483 s->s3->tmp.use_rsa_tmp=0;
485 /* only send if a DH key exchange or
486 * RSA but we have a sign only certificate */
487 if (s->s3->tmp.use_rsa_tmp
488 /* PSK: send ServerKeyExchange if PSK identity
489 * hint if provided */
490 #ifndef OPENSSL_NO_PSK
491 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
493 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
494 || (alg_k & SSL_kEECDH)
495 || ((alg_k & SSL_kRSA)
496 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
497 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
498 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
504 dtls1_start_timer(s);
505 ret=ssl3_send_server_key_exchange(s);
506 if (ret <= 0) goto end;
511 s->state=SSL3_ST_SW_CERT_REQ_A;
515 case SSL3_ST_SW_CERT_REQ_A:
516 case SSL3_ST_SW_CERT_REQ_B:
517 if (/* don't request cert unless asked for it: */
518 !(s->verify_mode & SSL_VERIFY_PEER) ||
519 /* if SSL_VERIFY_CLIENT_ONCE is set,
520 * don't request cert during re-negotiation: */
521 ((s->session->peer != NULL) &&
522 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
523 /* never request cert in anonymous ciphersuites
524 * (see section "Certificate request" in SSL 3 drafts
525 * and in RFC 2246): */
526 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
527 /* ... except when the application insists on verification
528 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
529 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
530 /* never request cert in Kerberos ciphersuites */
531 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
532 /* With normal PSK Certificates and
533 * Certificate Requests are omitted */
534 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
536 /* no cert request */
538 s->s3->tmp.cert_request=0;
539 s->state=SSL3_ST_SW_SRVR_DONE_A;
540 #ifndef OPENSSL_NO_SCTP
541 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
543 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
544 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
550 s->s3->tmp.cert_request=1;
551 dtls1_start_timer(s);
552 ret=ssl3_send_certificate_request(s);
553 if (ret <= 0) goto end;
554 #ifndef NETSCAPE_HANG_BUG
555 s->state=SSL3_ST_SW_SRVR_DONE_A;
556 #ifndef OPENSSL_NO_SCTP
557 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
559 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
560 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
564 s->state=SSL3_ST_SW_FLUSH;
565 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
566 #ifndef OPENSSL_NO_SCTP
567 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
569 s->d1->next_state = s->s3->tmp.next_state;
570 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
578 case SSL3_ST_SW_SRVR_DONE_A:
579 case SSL3_ST_SW_SRVR_DONE_B:
580 dtls1_start_timer(s);
581 ret=ssl3_send_server_done(s);
582 if (ret <= 0) goto end;
583 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
584 s->state=SSL3_ST_SW_FLUSH;
588 case SSL3_ST_SW_FLUSH:
589 s->rwstate=SSL_WRITING;
590 if (BIO_flush(s->wbio) <= 0)
592 /* If the write error was fatal, stop trying */
593 if (!BIO_should_retry(s->wbio))
595 s->rwstate=SSL_NOTHING;
596 s->state=s->s3->tmp.next_state;
602 s->rwstate=SSL_NOTHING;
603 s->state=s->s3->tmp.next_state;
606 case SSL3_ST_SR_CERT_A:
607 case SSL3_ST_SR_CERT_B:
608 /* Check for second client hello (MS SGC) */
609 ret = ssl3_check_client_hello(s);
615 s->state = SSL3_ST_SR_CLNT_HELLO_C;
618 /* could be sent for a DH cert, even if we
619 * have not asked for it :-) */
620 ret=ssl3_get_client_certificate(s);
621 if (ret <= 0) goto end;
623 s->state=SSL3_ST_SR_KEY_EXCH_A;
627 case SSL3_ST_SR_KEY_EXCH_A:
628 case SSL3_ST_SR_KEY_EXCH_B:
629 ret=ssl3_get_client_key_exchange(s);
630 if (ret <= 0) goto end;
631 #ifndef OPENSSL_NO_SCTP
632 /* Add new shared key for SCTP-Auth,
633 * will be ignored if no SCTP used.
635 snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
636 DTLS1_SCTP_AUTH_LABEL);
638 SSL_export_keying_material(s, sctpauthkey,
639 sizeof(sctpauthkey), labelbuffer,
640 sizeof(labelbuffer), NULL, 0, 0);
642 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
643 sizeof(sctpauthkey), sctpauthkey);
646 s->state=SSL3_ST_SR_CERT_VRFY_A;
651 /* For the ECDH ciphersuites when
652 * the client sends its ECDH pub key in
653 * a certificate, the CertificateVerify
654 * message is not sent.
656 s->state=SSL3_ST_SR_FINISHED_A;
659 else if (SSL_USE_SIGALGS(s))
661 s->state=SSL3_ST_SR_CERT_VRFY_A;
663 if (!s->session->peer)
665 /* For sigalgs freeze the handshake buffer
666 * at this point and digest cached records.
668 if (!s->s3->handshake_buffer)
670 SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
673 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
674 if (!ssl3_digest_cached_records(s))
679 s->state=SSL3_ST_SR_CERT_VRFY_A;
682 /* We need to get hashes here so if there is
683 * a client cert, it can be verified */
684 s->method->ssl3_enc->cert_verify_mac(s,
686 &(s->s3->tmp.cert_verify_md[0]));
687 s->method->ssl3_enc->cert_verify_mac(s,
689 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
693 case SSL3_ST_SR_CERT_VRFY_A:
694 case SSL3_ST_SR_CERT_VRFY_B:
696 s->d1->change_cipher_spec_ok = 1;
697 /* we should decide if we expected this one */
698 ret=ssl3_get_cert_verify(s);
699 if (ret <= 0) goto end;
700 #ifndef OPENSSL_NO_SCTP
701 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
702 state == SSL_ST_RENEGOTIATE)
703 s->state=DTLS1_SCTP_ST_SR_READ_SOCK;
706 s->state=SSL3_ST_SR_FINISHED_A;
710 case SSL3_ST_SR_FINISHED_A:
711 case SSL3_ST_SR_FINISHED_B:
712 s->d1->change_cipher_spec_ok = 1;
713 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
714 SSL3_ST_SR_FINISHED_B);
715 if (ret <= 0) goto end;
719 #ifndef OPENSSL_NO_TLSEXT
720 else if (s->tlsext_ticket_expected)
721 s->state=SSL3_ST_SW_SESSION_TICKET_A;
724 s->state=SSL3_ST_SW_CHANGE_A;
728 #ifndef OPENSSL_NO_TLSEXT
729 case SSL3_ST_SW_SESSION_TICKET_A:
730 case SSL3_ST_SW_SESSION_TICKET_B:
731 ret=ssl3_send_newsession_ticket(s);
732 if (ret <= 0) goto end;
733 s->state=SSL3_ST_SW_CHANGE_A;
737 case SSL3_ST_SW_CERT_STATUS_A:
738 case SSL3_ST_SW_CERT_STATUS_B:
739 ret=ssl3_send_cert_status(s);
740 if (ret <= 0) goto end;
741 s->state=SSL3_ST_SW_KEY_EXCH_A;
747 case SSL3_ST_SW_CHANGE_A:
748 case SSL3_ST_SW_CHANGE_B:
750 s->session->cipher=s->s3->tmp.new_cipher;
751 if (!s->method->ssl3_enc->setup_key_block(s))
752 { ret= -1; goto end; }
754 ret=dtls1_send_change_cipher_spec(s,
755 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
757 if (ret <= 0) goto end;
759 #ifndef OPENSSL_NO_SCTP
760 /* Change to new shared key of SCTP-Auth,
761 * will be ignored if no SCTP used.
763 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
766 s->state=SSL3_ST_SW_FINISHED_A;
769 if (!s->method->ssl3_enc->change_cipher_state(s,
770 SSL3_CHANGE_CIPHER_SERVER_WRITE))
776 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
779 case SSL3_ST_SW_FINISHED_A:
780 case SSL3_ST_SW_FINISHED_B:
781 ret=ssl3_send_finished(s,
782 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
783 s->method->ssl3_enc->server_finished_label,
784 s->method->ssl3_enc->server_finished_label_len);
785 if (ret <= 0) goto end;
786 s->state=SSL3_ST_SW_FLUSH;
788 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
791 s->s3->tmp.next_state=SSL_ST_OK;
792 #ifndef OPENSSL_NO_SCTP
793 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
795 s->d1->next_state = s->s3->tmp.next_state;
796 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
804 /* clean a few things up */
805 ssl3_cleanup_key_block(s);
808 BUF_MEM_free(s->init_buf);
812 /* remove buffering on output */
813 ssl_free_wbio_buffer(s);
817 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
822 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
824 s->ctx->stats.sess_accept_good++;
826 s->handshake_func=dtls1_accept;
828 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
833 /* done handshaking, next message is client hello */
834 s->d1->handshake_read_seq = 0;
835 /* next message is server hello */
836 s->d1->handshake_write_seq = 0;
837 s->d1->next_handshake_write_seq = 0;
842 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
848 if (!s->s3->tmp.reuse_message && !skip)
852 if ((ret=BIO_flush(s->wbio)) <= 0)
857 if ((cb != NULL) && (s->state != state))
861 cb(s,SSL_CB_ACCEPT_LOOP,1);
868 /* BIO_flush(s->wbio); */
871 #ifndef OPENSSL_NO_SCTP
872 /* Notify SCTP BIO socket to leave handshake
873 * mode and prevent stream identifier other
874 * than 0. Will be ignored if no SCTP is used.
876 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
880 cb(s,SSL_CB_ACCEPT_EXIT,ret);
884 int dtls1_send_hello_verify_request(SSL *s)
886 unsigned int msg_len;
887 unsigned char *msg, *buf, *p;
889 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
891 buf = (unsigned char *)s->init_buf->data;
893 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
894 /* Always use DTLS 1.0 version: see RFC 6347 */
895 *(p++) = DTLS1_VERSION >> 8;
896 *(p++) = DTLS1_VERSION & 0xFF;
898 if (s->ctx->app_gen_cookie_cb == NULL ||
899 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
900 &(s->d1->cookie_len)) == 0)
902 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
906 *(p++) = (unsigned char) s->d1->cookie_len;
907 memcpy(p, s->d1->cookie, s->d1->cookie_len);
908 p += s->d1->cookie_len;
911 dtls1_set_message_header(s, buf,
912 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
914 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
915 /* number of bytes to write */
920 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
921 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));