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, DTLSv1_enc_data)
148 IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
149 DTLSv1_2_server_method,
151 ssl_undefined_function,
152 dtls1_get_server_method, DTLSv1_2_enc_data)
154 IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
157 ssl_undefined_function,
158 dtls1_get_server_method, DTLSv1_2_enc_data)
160 int dtls1_accept(SSL *s)
163 unsigned long Time = (unsigned long)time(NULL);
164 void (*cb) (const SSL *ssl, int type, int val) = NULL;
167 int new_state, state, skip = 0;
169 #ifndef OPENSSL_NO_SCTP
170 unsigned char sctpauthkey[64];
171 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
174 RAND_add(&Time, sizeof(Time), 0);
178 if (s->info_callback != NULL)
179 cb = s->info_callback;
180 else if (s->ctx->info_callback != NULL)
181 cb = s->ctx->info_callback;
183 listen = s->d1->listen;
185 /* init things to blank */
187 if (!SSL_in_init(s) || SSL_in_before(s)) {
192 s->d1->listen = listen;
193 #ifndef OPENSSL_NO_SCTP
195 * Notify SCTP BIO socket to enter handshake mode and prevent stream
196 * identifier other than 0. Will be ignored if no SCTP is used.
198 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
199 s->in_handshake, NULL);
202 #ifndef OPENSSL_NO_HEARTBEATS
204 * If we're awaiting a HeartbeatResponse, pretend we already got and
205 * don't await it anymore, because Heartbeats don't make sense during
208 if (s->tlsext_hb_pending) {
210 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:
230 cb(s, SSL_CB_HANDSHAKE_START, 1);
232 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) {
239 if ((buf = BUF_MEM_new()) == NULL) {
241 s->state = SSL_ST_ERR;
244 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
247 s->state = SSL_ST_ERR;
253 if (!ssl3_setup_buffers(s)) {
255 s->state = SSL_ST_ERR;
261 * Should have been reset by ssl3_get_finished, too.
263 s->s3->change_cipher_spec = 0;
265 if (s->state != SSL_ST_RENEGOTIATE) {
267 * Ok, we now need to push on a buffering BIO so that the
268 * output is sent in a way that TCP likes :-) ...but not with
271 #ifndef OPENSSL_NO_SCTP
272 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
274 if (!ssl_init_wbio_buffer(s, 1)) {
276 s->state = SSL_ST_ERR;
280 ssl3_init_finished_mac(s);
281 s->state = SSL3_ST_SR_CLNT_HELLO_A;
282 s->ctx->stats.sess_accept++;
285 * s->state == SSL_ST_RENEGOTIATE, we will just send a
288 s->ctx->stats.sess_accept_renegotiate++;
289 s->state = SSL3_ST_SW_HELLO_REQ_A;
294 case SSL3_ST_SW_HELLO_REQ_A:
295 case SSL3_ST_SW_HELLO_REQ_B:
298 dtls1_clear_record_buffer(s);
299 dtls1_start_timer(s);
300 ret = ssl3_send_hello_request(s);
303 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
304 s->state = SSL3_ST_SW_FLUSH;
307 ssl3_init_finished_mac(s);
310 case SSL3_ST_SW_HELLO_REQ_C:
311 s->state = SSL_ST_OK;
314 case SSL3_ST_SR_CLNT_HELLO_A:
315 case SSL3_ST_SR_CLNT_HELLO_B:
316 case SSL3_ST_SR_CLNT_HELLO_C:
319 ret = ssl3_get_client_hello(s);
324 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
325 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
327 s->state = SSL3_ST_SW_SRVR_HELLO_A;
332 * Reflect ClientHello sequence to remain stateless while
336 DTLS_RECORD_LAYER_resync_write(&s->rlayer);
339 /* If we're just listening, stop here */
340 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) {
344 * Set expected sequence numbers 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);
360 s->state = SSL3_ST_SW_FLUSH;
361 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
363 /* HelloVerifyRequest resets Finished MAC */
364 if (s->version != DTLS1_BAD_VER)
365 ssl3_init_finished_mac(s);
368 #ifndef OPENSSL_NO_SCTP
369 case DTLS1_SCTP_ST_SR_READ_SOCK:
371 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_CHANGE_A;
383 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
384 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
389 if (s->d1->next_state != SSL_ST_OK) {
390 s->s3->in_read_app_data = 2;
391 s->rwstate = SSL_READING;
392 BIO_clear_retry_flags(SSL_get_rbio(s));
393 BIO_set_retry_read(SSL_get_rbio(s));
399 s->state = s->d1->next_state;
403 case SSL3_ST_SW_SRVR_HELLO_A:
404 case SSL3_ST_SW_SRVR_HELLO_B:
406 dtls1_start_timer(s);
407 ret = ssl3_send_server_hello(s);
412 #ifndef OPENSSL_NO_SCTP
414 * Add new shared key for SCTP-Auth, will be ignored if no
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 if (s->tlsext_ticket_expected)
428 s->state = SSL3_ST_SW_SESSION_TICKET_A;
430 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)) {
441 dtls1_start_timer(s);
442 ret = ssl3_send_server_certificate(s);
446 if (s->tlsext_status_expected)
447 s->state = SSL3_ST_SW_CERT_STATUS_A;
449 s->state = SSL3_ST_SW_KEY_EXCH_A;
452 s->state = SSL3_ST_SW_KEY_EXCH_A;
457 case SSL3_ST_SW_KEY_EXCH_A:
458 case SSL3_ST_SW_KEY_EXCH_B:
459 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
462 * clear this, it may get reset by
463 * send_server_key_exchange
465 s->s3->tmp.use_rsa_tmp = 0;
468 * only send if a DH key exchange or RSA but we have a sign only
473 * PSK: send ServerKeyExchange if PSK identity hint if
476 #ifndef OPENSSL_NO_PSK
477 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
479 || (alg_k & SSL_kDHE)
480 || (alg_k & SSL_kECDHE)
481 || ((alg_k & SSL_kRSA)
482 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
483 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
484 && EVP_PKEY_size(s->cert->pkeys
485 [SSL_PKEY_RSA_ENC].privatekey) *
486 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
491 dtls1_start_timer(s);
492 ret = ssl3_send_server_key_exchange(s);
498 s->state = SSL3_ST_SW_CERT_REQ_A;
502 case SSL3_ST_SW_CERT_REQ_A:
503 case SSL3_ST_SW_CERT_REQ_B:
504 if ( /* don't request cert unless asked for it: */
505 !(s->verify_mode & SSL_VERIFY_PEER) ||
507 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
508 * during re-negotiation:
510 ((s->session->peer != NULL) &&
511 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
513 * never request cert in anonymous ciphersuites (see
514 * section "Certificate request" in SSL 3 drafts and in
517 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
519 * ... except when the application insists on
520 * verification (against the specs, but s3_clnt.c accepts
523 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
525 * With normal PSK Certificates and Certificate Requests
528 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
529 /* no cert request */
531 s->s3->tmp.cert_request = 0;
532 s->state = SSL3_ST_SW_SRVR_DONE_A;
533 #ifndef OPENSSL_NO_SCTP
534 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
535 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
536 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
540 s->s3->tmp.cert_request = 1;
541 dtls1_start_timer(s);
542 ret = ssl3_send_certificate_request(s);
545 s->state = SSL3_ST_SW_SRVR_DONE_A;
546 # ifndef OPENSSL_NO_SCTP
547 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;
556 case SSL3_ST_SW_SRVR_DONE_A:
557 case SSL3_ST_SW_SRVR_DONE_B:
558 dtls1_start_timer(s);
559 ret = ssl3_send_server_done(s);
562 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
563 s->state = SSL3_ST_SW_FLUSH;
567 case SSL3_ST_SW_FLUSH:
568 s->rwstate = SSL_WRITING;
569 if (BIO_flush(s->wbio) <= 0) {
571 * If the write error was fatal, stop trying
573 if (!BIO_should_retry(s->wbio)) {
574 s->rwstate = SSL_NOTHING;
575 s->state = s->s3->tmp.next_state;
581 s->rwstate = SSL_NOTHING;
582 s->state = s->s3->tmp.next_state;
585 case SSL3_ST_SR_CERT_A:
586 case SSL3_ST_SR_CERT_B:
587 if (s->s3->tmp.cert_request) {
588 ret = ssl3_get_client_certificate(s);
593 s->state = SSL3_ST_SR_KEY_EXCH_A;
596 case SSL3_ST_SR_KEY_EXCH_A:
597 case SSL3_ST_SR_KEY_EXCH_B:
598 ret = ssl3_get_client_key_exchange(s);
601 #ifndef OPENSSL_NO_SCTP
603 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
606 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
607 DTLS1_SCTP_AUTH_LABEL);
609 SSL_export_keying_material(s, sctpauthkey,
610 sizeof(sctpauthkey), labelbuffer,
611 sizeof(labelbuffer), NULL, 0, 0);
613 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
614 sizeof(sctpauthkey), sctpauthkey);
617 s->state = SSL3_ST_SR_CERT_VRFY_A;
622 * For the ECDH ciphersuites when the client sends its ECDH
623 * pub key in a certificate, the CertificateVerify message is
626 s->state = SSL3_ST_SR_CHANGE_A;
628 } else if (SSL_USE_SIGALGS(s)) {
629 s->state = SSL3_ST_SR_CERT_VRFY_A;
631 if (!s->session->peer)
633 if (!s->s3->handshake_buffer) {
634 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
635 s->state = SSL_ST_ERR;
639 * For sigalgs freeze the handshake buffer. If we support
640 * extms we've done this already.
642 if (!ssl3_digest_cached_records(s, 1)) {
643 s->state = SSL_ST_ERR;
647 s->state = SSL3_ST_SR_CERT_VRFY_A;
651 * We need to get hashes here so if there is a client cert,
654 s->method->ssl3_enc->cert_verify_mac(s,
659 s->method->ssl3_enc->cert_verify_mac(s, NID_sha1,
662 [MD5_DIGEST_LENGTH]));
666 case SSL3_ST_SR_CERT_VRFY_A:
667 case SSL3_ST_SR_CERT_VRFY_B:
668 ret = ssl3_get_cert_verify(s);
671 #ifndef OPENSSL_NO_SCTP
672 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
673 state == SSL_ST_RENEGOTIATE)
674 s->state = DTLS1_SCTP_ST_SR_READ_SOCK;
677 s->state = SSL3_ST_SR_CHANGE_A;
681 case SSL3_ST_SR_CHANGE_A:
682 case SSL3_ST_SR_CHANGE_B:
683 ret = ssl3_get_change_cipher_spec(s, SSL3_ST_SR_CHANGE_A,
684 SSL3_ST_SR_CHANGE_B);
688 s->state = SSL3_ST_SR_FINISHED_A;
692 case SSL3_ST_SR_FINISHED_A:
693 case SSL3_ST_SR_FINISHED_B:
694 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
695 SSL3_ST_SR_FINISHED_B);
700 s->state = SSL_ST_OK;
701 else if (s->tlsext_ticket_expected)
702 s->state = SSL3_ST_SW_SESSION_TICKET_A;
704 s->state = SSL3_ST_SW_CHANGE_A;
708 case SSL3_ST_SW_SESSION_TICKET_A:
709 case SSL3_ST_SW_SESSION_TICKET_B:
710 ret = ssl3_send_newsession_ticket(s);
713 s->state = SSL3_ST_SW_CHANGE_A;
717 case SSL3_ST_SW_CERT_STATUS_A:
718 case SSL3_ST_SW_CERT_STATUS_B:
719 ret = ssl3_send_cert_status(s);
722 s->state = SSL3_ST_SW_KEY_EXCH_A;
726 case SSL3_ST_SW_CHANGE_A:
727 case SSL3_ST_SW_CHANGE_B:
729 s->session->cipher = s->s3->tmp.new_cipher;
730 if (!s->method->ssl3_enc->setup_key_block(s)) {
732 s->state = SSL_ST_ERR;
736 ret = dtls1_send_change_cipher_spec(s,
738 SSL3_ST_SW_CHANGE_B);
743 #ifndef OPENSSL_NO_SCTP
746 * Change to new shared key of SCTP-Auth, will be ignored if
749 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
754 s->state = SSL3_ST_SW_FINISHED_A;
757 if (!s->method->ssl3_enc->change_cipher_state(s,
758 SSL3_CHANGE_CIPHER_SERVER_WRITE))
761 s->state = SSL_ST_ERR;
765 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
768 case SSL3_ST_SW_FINISHED_A:
769 case SSL3_ST_SW_FINISHED_B:
770 ret = ssl3_send_finished(s,
771 SSL3_ST_SW_FINISHED_A,
772 SSL3_ST_SW_FINISHED_B,
774 ssl3_enc->server_finished_label,
776 ssl3_enc->server_finished_label_len);
779 s->state = SSL3_ST_SW_FLUSH;
781 s->s3->tmp.next_state = SSL3_ST_SR_CHANGE_A;
783 #ifndef OPENSSL_NO_SCTP
785 * Change to new shared key of SCTP-Auth, will be ignored if
788 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
792 s->s3->tmp.next_state = SSL_ST_OK;
793 #ifndef OPENSSL_NO_SCTP
794 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);
807 /* remove buffering on output */
808 ssl_free_wbio_buffer(s);
812 if (s->renegotiate == 2) { /* skipped if we just sent a
817 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
819 s->ctx->stats.sess_accept_good++;
821 s->handshake_func = dtls1_accept;
824 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
829 /* done handshaking, next message is client hello */
830 s->d1->handshake_read_seq = 0;
831 /* next message is server hello */
832 s->d1->handshake_write_seq = 0;
833 s->d1->next_handshake_write_seq = 0;
839 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE);
845 if (!s->s3->tmp.reuse_message && !skip) {
847 if ((ret = BIO_flush(s->wbio)) <= 0)
851 if ((cb != NULL) && (s->state != state)) {
852 new_state = s->state;
854 cb(s, SSL_CB_ACCEPT_LOOP, 1);
855 s->state = new_state;
861 /* BIO_flush(s->wbio); */
864 #ifndef OPENSSL_NO_SCTP
866 * Notify SCTP BIO socket to leave handshake mode and prevent stream
867 * identifier other than 0. Will be ignored if no SCTP is used.
869 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
870 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) {
884 buf = (unsigned char *)s->init_buf->data;
886 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
887 /* Always use DTLS 1.0 version: see RFC 6347 */
888 *(p++) = DTLS1_VERSION >> 8;
889 *(p++) = DTLS1_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) {
894 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,
895 ERR_R_INTERNAL_ERROR);
896 s->state = SSL_ST_ERR;
900 *(p++) = (unsigned char)s->d1->cookie_len;
901 memcpy(p, s->d1->cookie, s->d1->cookie_len);
902 p += s->d1->cookie_len;
905 dtls1_set_message_header(s, buf,
906 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0,
909 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
910 /* number of bytes to write */
911 s->init_num = p - buf;
915 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
916 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));