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))
261 if (!ssl3_setup_buffers(s))
268 s->d1->change_cipher_spec_ok = 0;
269 /* Should have been reset by ssl3_get_finished, too. */
270 s->s3->change_cipher_spec = 0;
272 if (s->state != SSL_ST_RENEGOTIATE)
274 /* Ok, we now need to push on a buffering BIO so that
275 * the output is sent in a way that TCP likes :-)
276 * ...but not with SCTP :-)
278 #ifndef OPENSSL_NO_SCTP
279 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
281 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
283 ssl3_init_finished_mac(s);
284 s->state=SSL3_ST_SR_CLNT_HELLO_A;
285 s->ctx->stats.sess_accept++;
289 /* s->state == SSL_ST_RENEGOTIATE,
290 * we will just send a HelloRequest */
291 s->ctx->stats.sess_accept_renegotiate++;
292 s->state=SSL3_ST_SW_HELLO_REQ_A;
297 case SSL3_ST_SW_HELLO_REQ_A:
298 case SSL3_ST_SW_HELLO_REQ_B:
301 dtls1_clear_record_buffer(s);
302 dtls1_start_timer(s);
303 ret=ssl3_send_hello_request(s);
304 if (ret <= 0) goto end;
305 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
306 s->state=SSL3_ST_SW_FLUSH;
309 ssl3_init_finished_mac(s);
312 case SSL3_ST_SW_HELLO_REQ_C:
316 case SSL3_ST_SR_CLNT_HELLO_A:
317 case SSL3_ST_SR_CLNT_HELLO_B:
318 case SSL3_ST_SR_CLNT_HELLO_C:
321 ret=ssl3_get_client_hello(s);
322 if (ret <= 0) goto end;
325 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
326 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
328 s->state = SSL3_ST_SW_SRVR_HELLO_A;
332 /* Reflect ClientHello sequence to remain stateless while listening */
335 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
338 /* If we're just listening, stop here */
339 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
343 /* Set expected sequence numbers
344 * to continue the handshake.
346 s->d1->handshake_read_seq = 2;
347 s->d1->handshake_write_seq = 1;
348 s->d1->next_handshake_write_seq = 1;
354 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
355 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
357 ret = dtls1_send_hello_verify_request(s);
358 if ( ret <= 0) goto end;
359 s->state=SSL3_ST_SW_FLUSH;
360 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
362 /* HelloVerifyRequest resets Finished MAC */
363 if (s->version != DTLS1_BAD_VER)
364 ssl3_init_finished_mac(s);
367 #ifndef OPENSSL_NO_SCTP
368 case DTLS1_SCTP_ST_SR_READ_SOCK:
370 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
372 s->s3->in_read_app_data=2;
373 s->rwstate=SSL_READING;
374 BIO_clear_retry_flags(SSL_get_rbio(s));
375 BIO_set_retry_read(SSL_get_rbio(s));
380 s->state=SSL3_ST_SR_FINISHED_A;
383 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
384 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
385 if (ret < 0) goto end;
389 if (s->d1->next_state != SSL_ST_OK)
391 s->s3->in_read_app_data=2;
392 s->rwstate=SSL_READING;
393 BIO_clear_retry_flags(SSL_get_rbio(s));
394 BIO_set_retry_read(SSL_get_rbio(s));
400 s->state=s->d1->next_state;
404 case SSL3_ST_SW_SRVR_HELLO_A:
405 case SSL3_ST_SW_SRVR_HELLO_B:
407 dtls1_start_timer(s);
408 ret=ssl3_send_server_hello(s);
409 if (ret <= 0) goto end;
413 #ifndef OPENSSL_NO_SCTP
414 /* Add new shared key for SCTP-Auth,
415 * will be ignored if no SCTP used.
417 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
418 DTLS1_SCTP_AUTH_LABEL);
420 SSL_export_keying_material(s, sctpauthkey,
421 sizeof(sctpauthkey), labelbuffer,
422 sizeof(labelbuffer), NULL, 0, 0);
424 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
425 sizeof(sctpauthkey), sctpauthkey);
427 #ifndef OPENSSL_NO_TLSEXT
428 if (s->tlsext_ticket_expected)
429 s->state=SSL3_ST_SW_SESSION_TICKET_A;
431 s->state=SSL3_ST_SW_CHANGE_A;
433 s->state=SSL3_ST_SW_CHANGE_A;
437 s->state=SSL3_ST_SW_CERT_A;
441 case SSL3_ST_SW_CERT_A:
442 case SSL3_ST_SW_CERT_B:
443 /* Check if it is anon DH or normal PSK */
444 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
445 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
447 dtls1_start_timer(s);
448 ret=ssl3_send_server_certificate(s);
449 if (ret <= 0) goto end;
450 #ifndef OPENSSL_NO_TLSEXT
451 if (s->tlsext_status_expected)
452 s->state=SSL3_ST_SW_CERT_STATUS_A;
454 s->state=SSL3_ST_SW_KEY_EXCH_A;
459 s->state=SSL3_ST_SW_KEY_EXCH_A;
466 s->state=SSL3_ST_SW_KEY_EXCH_A;
471 case SSL3_ST_SW_KEY_EXCH_A:
472 case SSL3_ST_SW_KEY_EXCH_B:
473 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
475 /* clear this, it may get reset by
476 * send_server_key_exchange */
477 if ((s->options & SSL_OP_EPHEMERAL_RSA)
478 #ifndef OPENSSL_NO_KRB5
479 && !(alg_k & SSL_kKRB5)
480 #endif /* OPENSSL_NO_KRB5 */
482 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
483 * even when forbidden by protocol specs
484 * (handshake may fail as clients are not required to
485 * be able to handle this) */
486 s->s3->tmp.use_rsa_tmp=1;
488 s->s3->tmp.use_rsa_tmp=0;
490 /* only send if a DH key exchange or
491 * RSA but we have a sign only certificate */
492 if (s->s3->tmp.use_rsa_tmp
493 /* PSK: send ServerKeyExchange if PSK identity
494 * hint if provided */
495 #ifndef OPENSSL_NO_PSK
496 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
498 || (alg_k & (SSL_kDHE|SSL_kDHr|SSL_kDHd))
499 || (alg_k & SSL_kECDHE)
500 || ((alg_k & SSL_kRSA)
501 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
502 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
503 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
509 dtls1_start_timer(s);
510 ret=ssl3_send_server_key_exchange(s);
511 if (ret <= 0) goto end;
516 s->state=SSL3_ST_SW_CERT_REQ_A;
520 case SSL3_ST_SW_CERT_REQ_A:
521 case SSL3_ST_SW_CERT_REQ_B:
522 if (/* don't request cert unless asked for it: */
523 !(s->verify_mode & SSL_VERIFY_PEER) ||
524 /* if SSL_VERIFY_CLIENT_ONCE is set,
525 * don't request cert during re-negotiation: */
526 ((s->session->peer != NULL) &&
527 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
528 /* never request cert in anonymous ciphersuites
529 * (see section "Certificate request" in SSL 3 drafts
530 * and in RFC 2246): */
531 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
532 /* ... except when the application insists on verification
533 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
534 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
535 /* never request cert in Kerberos ciphersuites */
536 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
537 /* With normal PSK Certificates and
538 * Certificate Requests are omitted */
539 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
541 /* no cert request */
543 s->s3->tmp.cert_request=0;
544 s->state=SSL3_ST_SW_SRVR_DONE_A;
545 #ifndef OPENSSL_NO_SCTP
546 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
548 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
549 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
555 s->s3->tmp.cert_request=1;
556 dtls1_start_timer(s);
557 ret=ssl3_send_certificate_request(s);
558 if (ret <= 0) goto end;
559 #ifndef NETSCAPE_HANG_BUG
560 s->state=SSL3_ST_SW_SRVR_DONE_A;
561 #ifndef OPENSSL_NO_SCTP
562 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
564 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
565 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
569 s->state=SSL3_ST_SW_FLUSH;
570 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
571 #ifndef OPENSSL_NO_SCTP
572 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
574 s->d1->next_state = s->s3->tmp.next_state;
575 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
583 case SSL3_ST_SW_SRVR_DONE_A:
584 case SSL3_ST_SW_SRVR_DONE_B:
585 dtls1_start_timer(s);
586 ret=ssl3_send_server_done(s);
587 if (ret <= 0) goto end;
588 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
589 s->state=SSL3_ST_SW_FLUSH;
593 case SSL3_ST_SW_FLUSH:
594 s->rwstate=SSL_WRITING;
595 if (BIO_flush(s->wbio) <= 0)
597 /* If the write error was fatal, stop trying */
598 if (!BIO_should_retry(s->wbio))
600 s->rwstate=SSL_NOTHING;
601 s->state=s->s3->tmp.next_state;
607 s->rwstate=SSL_NOTHING;
608 s->state=s->s3->tmp.next_state;
611 case SSL3_ST_SR_CERT_A:
612 case SSL3_ST_SR_CERT_B:
613 if (s->s3->tmp.cert_request)
615 ret=ssl3_get_client_certificate(s);
616 if (ret <= 0) goto end;
619 s->state=SSL3_ST_SR_KEY_EXCH_A;
622 case SSL3_ST_SR_KEY_EXCH_A:
623 case SSL3_ST_SR_KEY_EXCH_B:
624 ret=ssl3_get_client_key_exchange(s);
625 if (ret <= 0) goto end;
626 #ifndef OPENSSL_NO_SCTP
627 /* Add new shared key for SCTP-Auth,
628 * will be ignored if no SCTP used.
630 snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
631 DTLS1_SCTP_AUTH_LABEL);
633 SSL_export_keying_material(s, sctpauthkey,
634 sizeof(sctpauthkey), labelbuffer,
635 sizeof(labelbuffer), NULL, 0, 0);
637 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
638 sizeof(sctpauthkey), sctpauthkey);
641 s->state=SSL3_ST_SR_CERT_VRFY_A;
646 /* For the ECDH ciphersuites when
647 * the client sends its ECDH pub key in
648 * a certificate, the CertificateVerify
649 * message is not sent.
651 s->state=SSL3_ST_SR_FINISHED_A;
654 else if (SSL_USE_SIGALGS(s))
656 s->state=SSL3_ST_SR_CERT_VRFY_A;
658 if (!s->session->peer)
660 /* For sigalgs freeze the handshake buffer
661 * at this point and digest cached records.
663 if (!s->s3->handshake_buffer)
665 SSLerr(SSL_F_DTLS1_ACCEPT,ERR_R_INTERNAL_ERROR);
668 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
669 if (!ssl3_digest_cached_records(s))
674 s->state=SSL3_ST_SR_CERT_VRFY_A;
677 /* We need to get hashes here so if there is
678 * a client cert, it can be verified */
679 s->method->ssl3_enc->cert_verify_mac(s,
681 &(s->s3->tmp.cert_verify_md[0]));
682 s->method->ssl3_enc->cert_verify_mac(s,
684 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
688 case SSL3_ST_SR_CERT_VRFY_A:
689 case SSL3_ST_SR_CERT_VRFY_B:
691 * This *should* be the first time we enable CCS, but be
692 * extra careful about surrounding code changes. We need
693 * to set this here because we don't know if we're
694 * expecting a CertificateVerify or not.
696 if (!s->s3->change_cipher_spec)
697 s->d1->change_cipher_spec_ok = 1;
698 /* we should decide if we expected this one */
699 ret=ssl3_get_cert_verify(s);
700 if (ret <= 0) goto end;
701 #ifndef OPENSSL_NO_SCTP
702 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
703 state == SSL_ST_RENEGOTIATE)
704 s->state=DTLS1_SCTP_ST_SR_READ_SOCK;
707 s->state=SSL3_ST_SR_FINISHED_A;
711 case SSL3_ST_SR_FINISHED_A:
712 case SSL3_ST_SR_FINISHED_B:
714 * Enable CCS for resumed handshakes.
715 * In a full handshake, we end up here through
716 * SSL3_ST_SR_CERT_VRFY_B, so change_cipher_spec_ok was
717 * already set. Receiving a CCS clears the flag, so make
718 * sure not to re-enable it to ban duplicates.
719 * s->s3->change_cipher_spec is set when a CCS is
720 * processed in d1_pkt.c, and remains set until
721 * the client's Finished message is read.
723 if (!s->s3->change_cipher_spec)
724 s->d1->change_cipher_spec_ok = 1;
725 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
726 SSL3_ST_SR_FINISHED_B);
727 if (ret <= 0) goto end;
731 #ifndef OPENSSL_NO_TLSEXT
732 else if (s->tlsext_ticket_expected)
733 s->state=SSL3_ST_SW_SESSION_TICKET_A;
736 s->state=SSL3_ST_SW_CHANGE_A;
740 #ifndef OPENSSL_NO_TLSEXT
741 case SSL3_ST_SW_SESSION_TICKET_A:
742 case SSL3_ST_SW_SESSION_TICKET_B:
743 ret=ssl3_send_newsession_ticket(s);
744 if (ret <= 0) goto end;
745 s->state=SSL3_ST_SW_CHANGE_A;
749 case SSL3_ST_SW_CERT_STATUS_A:
750 case SSL3_ST_SW_CERT_STATUS_B:
751 ret=ssl3_send_cert_status(s);
752 if (ret <= 0) goto end;
753 s->state=SSL3_ST_SW_KEY_EXCH_A;
759 case SSL3_ST_SW_CHANGE_A:
760 case SSL3_ST_SW_CHANGE_B:
762 s->session->cipher=s->s3->tmp.new_cipher;
763 if (!s->method->ssl3_enc->setup_key_block(s))
764 { ret= -1; goto end; }
766 ret=dtls1_send_change_cipher_spec(s,
767 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
769 if (ret <= 0) goto end;
771 #ifndef OPENSSL_NO_SCTP
774 /* Change to new shared key of SCTP-Auth,
775 * will be ignored if no SCTP used.
777 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
781 s->state=SSL3_ST_SW_FINISHED_A;
784 if (!s->method->ssl3_enc->change_cipher_state(s,
785 SSL3_CHANGE_CIPHER_SERVER_WRITE))
791 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
794 case SSL3_ST_SW_FINISHED_A:
795 case SSL3_ST_SW_FINISHED_B:
796 ret=ssl3_send_finished(s,
797 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
798 s->method->ssl3_enc->server_finished_label,
799 s->method->ssl3_enc->server_finished_label_len);
800 if (ret <= 0) goto end;
801 s->state=SSL3_ST_SW_FLUSH;
804 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
806 #ifndef OPENSSL_NO_SCTP
807 /* Change to new shared key of SCTP-Auth,
808 * will be ignored if no SCTP used.
810 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
815 s->s3->tmp.next_state=SSL_ST_OK;
816 #ifndef OPENSSL_NO_SCTP
817 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
819 s->d1->next_state = s->s3->tmp.next_state;
820 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
828 /* clean a few things up */
829 ssl3_cleanup_key_block(s);
832 BUF_MEM_free(s->init_buf);
836 /* remove buffering on output */
837 ssl_free_wbio_buffer(s);
841 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
846 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
848 s->ctx->stats.sess_accept_good++;
850 s->handshake_func=dtls1_accept;
852 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
857 /* done handshaking, next message is client hello */
858 s->d1->handshake_read_seq = 0;
859 /* next message is server hello */
860 s->d1->handshake_write_seq = 0;
861 s->d1->next_handshake_write_seq = 0;
866 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
872 if (!s->s3->tmp.reuse_message && !skip)
876 if ((ret=BIO_flush(s->wbio)) <= 0)
881 if ((cb != NULL) && (s->state != state))
885 cb(s,SSL_CB_ACCEPT_LOOP,1);
892 /* BIO_flush(s->wbio); */
895 #ifndef OPENSSL_NO_SCTP
896 /* Notify SCTP BIO socket to leave handshake
897 * mode and prevent stream identifier other
898 * than 0. Will be ignored if no SCTP is used.
900 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
904 cb(s,SSL_CB_ACCEPT_EXIT,ret);
908 int dtls1_send_hello_verify_request(SSL *s)
910 unsigned int msg_len;
911 unsigned char *msg, *buf, *p;
913 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
915 buf = (unsigned char *)s->init_buf->data;
917 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
918 /* Always use DTLS 1.0 version: see RFC 6347 */
919 *(p++) = DTLS1_VERSION >> 8;
920 *(p++) = DTLS1_VERSION & 0xFF;
922 if (s->ctx->app_gen_cookie_cb == NULL ||
923 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
924 &(s->d1->cookie_len)) == 0)
926 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
930 *(p++) = (unsigned char) s->d1->cookie_len;
931 memcpy(p, s->d1->cookie, s->d1->cookie_len);
932 p += s->d1->cookie_len;
935 dtls1_set_message_header(s, buf,
936 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
938 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
939 /* number of bytes to write */
944 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
945 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));