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 #ifndef OPENSSL_NO_KRB5
119 #include "kssl_lcl.h"
121 #include <openssl/buffer.h>
122 #include <openssl/rand.h>
123 #include <openssl/objects.h>
124 #include <openssl/evp.h>
125 #include <openssl/md5.h>
126 #include <openssl/bn.h>
127 #ifndef OPENSSL_NO_DH
128 #include <openssl/dh.h>
131 static const SSL_METHOD *dtls1_get_client_method(int ver);
132 static int dtls1_get_hello_verify(SSL *s);
134 static const SSL_METHOD *dtls1_get_client_method(int ver)
136 if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
137 return(DTLSv1_client_method());
142 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
143 ssl_undefined_function,
145 dtls1_get_client_method)
147 int dtls1_connect(SSL *s)
150 unsigned long Time=(unsigned long)time(NULL);
151 void (*cb)(const SSL *ssl,int type,int val)=NULL;
153 int new_state,state,skip=0;
154 #ifndef OPENSSL_NO_SCTP
155 unsigned char sctpauthkey[64];
156 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
159 RAND_add(&Time,sizeof(Time),0);
163 if (s->info_callback != NULL)
165 else if (s->ctx->info_callback != NULL)
166 cb=s->ctx->info_callback;
169 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
171 #ifndef OPENSSL_NO_SCTP
172 /* Notify SCTP BIO socket to enter handshake
173 * mode and prevent stream identifier other
174 * than 0. Will be ignored if no SCTP is used.
176 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
179 #ifndef OPENSSL_NO_HEARTBEATS
180 /* If we're awaiting a HeartbeatResponse, pretend we
181 * already got and don't await it anymore, because
182 * Heartbeats don't make sense during handshakes anyway.
184 if (s->tlsext_hb_pending)
187 s->tlsext_hb_pending = 0;
198 case SSL_ST_RENEGOTIATE:
200 s->state=SSL_ST_CONNECT;
201 s->ctx->stats.sess_connect_renegotiate++;
205 case SSL_ST_BEFORE|SSL_ST_CONNECT:
206 case SSL_ST_OK|SSL_ST_CONNECT:
209 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
211 if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
212 (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
214 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
219 /* s->version=SSL3_VERSION; */
220 s->type=SSL_ST_CONNECT;
222 if (s->init_buf == NULL)
224 if ((buf=BUF_MEM_new()) == NULL)
229 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
238 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
240 /* setup buffing BIO */
241 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
243 /* don't push the buffering BIO quite yet */
245 s->state=SSL3_ST_CW_CLNT_HELLO_A;
246 s->ctx->stats.sess_connect++;
248 /* mark client_random uninitialized */
249 memset(s->s3->client_random,0,sizeof(s->s3->client_random));
250 s->d1->send_cookie = 0;
254 #ifndef OPENSSL_NO_SCTP
255 case DTLS1_SCTP_ST_CR_READ_SOCK:
257 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
259 s->s3->in_read_app_data=2;
260 s->rwstate=SSL_READING;
261 BIO_clear_retry_flags(SSL_get_rbio(s));
262 BIO_set_retry_read(SSL_get_rbio(s));
267 s->state=s->s3->tmp.next_state;
270 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
271 /* read app data until dry event */
273 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
274 if (ret < 0) goto end;
278 s->s3->in_read_app_data=2;
279 s->rwstate=SSL_READING;
280 BIO_clear_retry_flags(SSL_get_rbio(s));
281 BIO_set_retry_read(SSL_get_rbio(s));
286 s->state=s->d1->next_state;
290 case SSL3_ST_CW_CLNT_HELLO_A:
291 case SSL3_ST_CW_CLNT_HELLO_B:
295 /* every DTLS ClientHello resets Finished MAC */
296 ssl3_init_finished_mac(s);
298 dtls1_start_timer(s);
299 ret=ssl3_client_hello(s);
300 if (ret <= 0) goto end;
302 if ( s->d1->send_cookie)
304 s->state=SSL3_ST_CW_FLUSH;
305 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
308 s->state=SSL3_ST_CR_SRVR_HELLO_A;
312 #ifndef OPENSSL_NO_SCTP
313 /* Disable buffering for SCTP */
314 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
317 /* turn on buffering for the next lot of output */
318 if (s->bbio != s->wbio)
319 s->wbio=BIO_push(s->bbio,s->wbio);
320 #ifndef OPENSSL_NO_SCTP
326 case SSL3_ST_CR_SRVR_HELLO_A:
327 case SSL3_ST_CR_SRVR_HELLO_B:
328 ret=ssl3_get_server_hello(s);
329 if (ret <= 0) goto end;
334 #ifndef OPENSSL_NO_SCTP
335 /* Add new shared key for SCTP-Auth,
336 * will be ignored if no SCTP used.
338 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
339 DTLS1_SCTP_AUTH_LABEL);
341 SSL_export_keying_material(s, sctpauthkey,
342 sizeof(sctpauthkey), labelbuffer,
343 sizeof(labelbuffer), NULL, 0, 0);
345 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
346 sizeof(sctpauthkey), sctpauthkey);
349 s->state=SSL3_ST_CR_FINISHED_A;
352 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
357 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
358 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
360 ret = dtls1_get_hello_verify(s);
364 if ( s->d1->send_cookie) /* start again, with a cookie */
365 s->state=SSL3_ST_CW_CLNT_HELLO_A;
367 s->state = SSL3_ST_CR_CERT_A;
371 case SSL3_ST_CR_CERT_A:
372 case SSL3_ST_CR_CERT_B:
373 #ifndef OPENSSL_NO_TLSEXT
374 ret=ssl3_check_finished(s);
375 if (ret <= 0) goto end;
379 if (s->tlsext_ticket_expected)
380 s->state=SSL3_ST_CR_SESSION_TICKET_A;
382 s->state=SSL3_ST_CR_FINISHED_A;
387 /* Check if it is anon DH or PSK */
388 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
389 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
391 ret=ssl3_get_server_certificate(s);
392 if (ret <= 0) goto end;
393 #ifndef OPENSSL_NO_TLSEXT
394 if (s->tlsext_status_expected)
395 s->state=SSL3_ST_CR_CERT_STATUS_A;
397 s->state=SSL3_ST_CR_KEY_EXCH_A;
402 s->state=SSL3_ST_CR_KEY_EXCH_A;
409 s->state=SSL3_ST_CR_KEY_EXCH_A;
414 case SSL3_ST_CR_KEY_EXCH_A:
415 case SSL3_ST_CR_KEY_EXCH_B:
416 ret=ssl3_get_key_exchange(s);
417 if (ret <= 0) goto end;
418 s->state=SSL3_ST_CR_CERT_REQ_A;
421 /* at this point we check that we have the
422 * required stuff from the server */
423 if (!ssl3_check_cert_and_algorithm(s))
430 case SSL3_ST_CR_CERT_REQ_A:
431 case SSL3_ST_CR_CERT_REQ_B:
432 ret=ssl3_get_certificate_request(s);
433 if (ret <= 0) goto end;
434 s->state=SSL3_ST_CR_SRVR_DONE_A;
438 case SSL3_ST_CR_SRVR_DONE_A:
439 case SSL3_ST_CR_SRVR_DONE_B:
440 ret=ssl3_get_server_done(s);
441 if (ret <= 0) goto end;
443 if (s->s3->tmp.cert_req)
444 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;
446 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;
449 #ifndef OPENSSL_NO_SCTP
450 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
451 state == SSL_ST_RENEGOTIATE)
452 s->state=DTLS1_SCTP_ST_CR_READ_SOCK;
455 s->state=s->s3->tmp.next_state;
458 case SSL3_ST_CW_CERT_A:
459 case SSL3_ST_CW_CERT_B:
460 case SSL3_ST_CW_CERT_C:
461 case SSL3_ST_CW_CERT_D:
462 dtls1_start_timer(s);
463 ret=ssl3_send_client_certificate(s);
464 if (ret <= 0) goto end;
465 s->state=SSL3_ST_CW_KEY_EXCH_A;
469 case SSL3_ST_CW_KEY_EXCH_A:
470 case SSL3_ST_CW_KEY_EXCH_B:
471 dtls1_start_timer(s);
472 ret=ssl3_send_client_key_exchange(s);
473 if (ret <= 0) goto end;
475 #ifndef OPENSSL_NO_SCTP
476 /* Add new shared key for SCTP-Auth,
477 * will be ignored if no SCTP used.
479 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
480 DTLS1_SCTP_AUTH_LABEL);
482 SSL_export_keying_material(s, sctpauthkey,
483 sizeof(sctpauthkey), labelbuffer,
484 sizeof(labelbuffer), NULL, 0, 0);
486 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
487 sizeof(sctpauthkey), sctpauthkey);
490 /* EAY EAY EAY need to check for DH fix cert
492 /* For TLS, cert_req is set to 2, so a cert chain
493 * of nothing is sent, but no verify packet is sent */
494 if (s->s3->tmp.cert_req == 1)
496 s->state=SSL3_ST_CW_CERT_VRFY_A;
500 #ifndef OPENSSL_NO_SCTP
501 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
503 s->d1->next_state=SSL3_ST_CW_CHANGE_A;
504 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
508 s->state=SSL3_ST_CW_CHANGE_A;
509 s->s3->change_cipher_spec=0;
515 case SSL3_ST_CW_CERT_VRFY_A:
516 case SSL3_ST_CW_CERT_VRFY_B:
517 dtls1_start_timer(s);
518 ret=ssl3_send_client_verify(s);
519 if (ret <= 0) goto end;
520 #ifndef OPENSSL_NO_SCTP
521 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
523 s->d1->next_state=SSL3_ST_CW_CHANGE_A;
524 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
528 s->state=SSL3_ST_CW_CHANGE_A;
530 s->s3->change_cipher_spec=0;
533 case SSL3_ST_CW_CHANGE_A:
534 case SSL3_ST_CW_CHANGE_B:
536 dtls1_start_timer(s);
537 ret=dtls1_send_change_cipher_spec(s,
538 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
539 if (ret <= 0) goto end;
541 #ifndef OPENSSL_NO_SCTP
542 /* Change to new shared key of SCTP-Auth,
543 * will be ignored if no SCTP used.
545 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
548 s->state=SSL3_ST_CW_FINISHED_A;
551 s->session->cipher=s->s3->tmp.new_cipher;
552 #ifdef OPENSSL_NO_COMP
553 s->session->compress_meth=0;
555 if (s->s3->tmp.new_compression == NULL)
556 s->session->compress_meth=0;
558 s->session->compress_meth=
559 s->s3->tmp.new_compression->id;
561 if (!s->method->ssl3_enc->setup_key_block(s))
567 if (!s->method->ssl3_enc->change_cipher_state(s,
568 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
574 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
577 case SSL3_ST_CW_FINISHED_A:
578 case SSL3_ST_CW_FINISHED_B:
580 dtls1_start_timer(s);
581 ret=ssl3_send_finished(s,
582 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
583 s->method->ssl3_enc->client_finished_label,
584 s->method->ssl3_enc->client_finished_label_len);
585 if (ret <= 0) goto end;
586 s->state=SSL3_ST_CW_FLUSH;
589 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
592 s->s3->tmp.next_state=SSL_ST_OK;
593 #ifndef OPENSSL_NO_SCTP
594 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
596 s->d1->next_state = s->s3->tmp.next_state;
597 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
600 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
603 #ifndef OPENSSL_NO_SCTP
604 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
606 s->d1->next_state = SSL_ST_OK;
607 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
610 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
611 s->s3->delay_buf_pop_ret=0;
616 #ifndef OPENSSL_NO_TLSEXT
617 /* Allow NewSessionTicket if ticket expected */
618 if (s->tlsext_ticket_expected)
619 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
623 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
628 #ifndef OPENSSL_NO_TLSEXT
629 case SSL3_ST_CR_SESSION_TICKET_A:
630 case SSL3_ST_CR_SESSION_TICKET_B:
631 ret=ssl3_get_new_session_ticket(s);
632 if (ret <= 0) goto end;
633 s->state=SSL3_ST_CR_FINISHED_A;
637 case SSL3_ST_CR_CERT_STATUS_A:
638 case SSL3_ST_CR_CERT_STATUS_B:
639 ret=ssl3_get_cert_status(s);
640 if (ret <= 0) goto end;
641 s->state=SSL3_ST_CR_KEY_EXCH_A;
646 case SSL3_ST_CR_FINISHED_A:
647 case SSL3_ST_CR_FINISHED_B:
648 s->d1->change_cipher_spec_ok = 1;
649 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
650 SSL3_ST_CR_FINISHED_B);
651 if (ret <= 0) goto end;
655 s->state=SSL3_ST_CW_CHANGE_A;
659 #ifndef OPENSSL_NO_SCTP
660 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
661 state == SSL_ST_RENEGOTIATE)
663 s->d1->next_state=s->state;
664 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
671 case SSL3_ST_CW_FLUSH:
672 s->rwstate=SSL_WRITING;
673 if (BIO_flush(s->wbio) <= 0)
675 /* If the write error was fatal, stop trying */
676 if (!BIO_should_retry(s->wbio))
678 s->rwstate=SSL_NOTHING;
679 s->state=s->s3->tmp.next_state;
685 s->rwstate=SSL_NOTHING;
686 s->state=s->s3->tmp.next_state;
690 /* clean a few things up */
691 ssl3_cleanup_key_block(s);
694 if (s->init_buf != NULL)
696 BUF_MEM_free(s->init_buf);
701 /* If we are not 'joining' the last two packets,
702 * remove the buffering now */
703 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
704 ssl_free_wbio_buffer(s);
705 /* else do it later in ssl3_write */
711 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
712 if (s->hit) s->ctx->stats.sess_hit++;
716 s->handshake_func=dtls1_connect;
717 s->ctx->stats.sess_connect_good++;
719 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
721 /* done with handshaking */
722 s->d1->handshake_read_seq = 0;
723 s->d1->next_handshake_write_seq = 0;
728 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
734 /* did we do anything */
735 if (!s->s3->tmp.reuse_message && !skip)
739 if ((ret=BIO_flush(s->wbio)) <= 0)
743 if ((cb != NULL) && (s->state != state))
747 cb(s,SSL_CB_CONNECT_LOOP,1);
756 #ifndef OPENSSL_NO_SCTP
757 /* Notify SCTP BIO socket to leave handshake
758 * mode and allow stream identifier other
759 * than 0. Will be ignored if no SCTP is used.
761 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
767 cb(s,SSL_CB_CONNECT_EXIT,ret);
771 static int dtls1_get_hello_verify(SSL *s)
775 unsigned int cookie_len;
777 n=s->method->ssl_get_message(s,
778 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
779 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
784 if (!ok) return((int)n);
786 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
788 s->d1->send_cookie = 0;
789 s->s3->tmp.reuse_message=1;
793 data = (unsigned char *)s->init_msg;
795 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
797 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
798 s->version=(s->version&0xff00)|data[1];
799 al = SSL_AD_PROTOCOL_VERSION;
804 cookie_len = *(data++);
805 if ( cookie_len > sizeof(s->d1->cookie))
807 al=SSL_AD_ILLEGAL_PARAMETER;
811 memcpy(s->d1->cookie, data, cookie_len);
812 s->d1->cookie_len = cookie_len;
814 s->d1->send_cookie = 1;
818 ssl3_send_alert(s, SSL3_AL_FATAL, al);