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) {
243 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
251 if (!ssl3_setup_buffers(s)) {
257 s->d1->change_cipher_spec_ok = 0;
259 * Should have been reset by ssl3_get_finished, too.
261 s->s3->change_cipher_spec = 0;
263 if (s->state != SSL_ST_RENEGOTIATE) {
265 * Ok, we now need to push on a buffering BIO so that the
266 * output is sent in a way that TCP likes :-) ...but not with
269 #ifndef OPENSSL_NO_SCTP
270 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
272 if (!ssl_init_wbio_buffer(s, 1)) {
277 ssl3_init_finished_mac(s);
278 s->state = SSL3_ST_SR_CLNT_HELLO_A;
279 s->ctx->stats.sess_accept++;
282 * s->state == SSL_ST_RENEGOTIATE, we will just send a
285 s->ctx->stats.sess_accept_renegotiate++;
286 s->state = SSL3_ST_SW_HELLO_REQ_A;
291 case SSL3_ST_SW_HELLO_REQ_A:
292 case SSL3_ST_SW_HELLO_REQ_B:
295 dtls1_clear_record_buffer(s);
296 dtls1_start_timer(s);
297 ret = ssl3_send_hello_request(s);
300 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
301 s->state = SSL3_ST_SW_FLUSH;
304 ssl3_init_finished_mac(s);
307 case SSL3_ST_SW_HELLO_REQ_C:
308 s->state = SSL_ST_OK;
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);
321 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
322 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
324 s->state = SSL3_ST_SW_SRVR_HELLO_A;
329 * Reflect ClientHello sequence to remain stateless while
333 DTLS_RECORD_LAYER_resync_write(&s->rlayer);
336 /* If we're just listening, stop here */
337 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) {
341 * Set expected sequence numbers to continue the handshake.
343 s->d1->handshake_read_seq = 2;
344 s->d1->handshake_write_seq = 1;
345 s->d1->next_handshake_write_seq = 1;
351 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
352 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
354 ret = dtls1_send_hello_verify_request(s);
357 s->state = SSL3_ST_SW_FLUSH;
358 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
360 /* HelloVerifyRequest resets Finished MAC */
361 if (s->version != DTLS1_BAD_VER)
362 ssl3_init_finished_mac(s);
365 #ifndef OPENSSL_NO_SCTP
366 case DTLS1_SCTP_ST_SR_READ_SOCK:
368 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
369 s->s3->in_read_app_data = 2;
370 s->rwstate = SSL_READING;
371 BIO_clear_retry_flags(SSL_get_rbio(s));
372 BIO_set_retry_read(SSL_get_rbio(s));
377 s->state = SSL3_ST_SR_FINISHED_A;
380 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
381 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
386 if (s->d1->next_state != SSL_ST_OK) {
387 s->s3->in_read_app_data = 2;
388 s->rwstate = SSL_READING;
389 BIO_clear_retry_flags(SSL_get_rbio(s));
390 BIO_set_retry_read(SSL_get_rbio(s));
396 s->state = s->d1->next_state;
400 case SSL3_ST_SW_SRVR_HELLO_A:
401 case SSL3_ST_SW_SRVR_HELLO_B:
403 dtls1_start_timer(s);
404 ret = ssl3_send_server_hello(s);
409 #ifndef OPENSSL_NO_SCTP
411 * Add new shared key for SCTP-Auth, will be ignored if no
414 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
415 DTLS1_SCTP_AUTH_LABEL);
417 SSL_export_keying_material(s, sctpauthkey,
418 sizeof(sctpauthkey), labelbuffer,
419 sizeof(labelbuffer), NULL, 0, 0);
421 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
422 sizeof(sctpauthkey), sctpauthkey);
424 #ifndef OPENSSL_NO_TLSEXT
425 if (s->tlsext_ticket_expected)
426 s->state = SSL3_ST_SW_SESSION_TICKET_A;
428 s->state = SSL3_ST_SW_CHANGE_A;
430 s->state = SSL3_ST_SW_CHANGE_A;
433 s->state = SSL3_ST_SW_CERT_A;
437 case SSL3_ST_SW_CERT_A:
438 case SSL3_ST_SW_CERT_B:
439 /* Check if it is anon DH or normal PSK */
440 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
441 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
442 dtls1_start_timer(s);
443 ret = ssl3_send_server_certificate(s);
446 #ifndef OPENSSL_NO_TLSEXT
447 if (s->tlsext_status_expected)
448 s->state = SSL3_ST_SW_CERT_STATUS_A;
450 s->state = SSL3_ST_SW_KEY_EXCH_A;
453 s->state = SSL3_ST_SW_KEY_EXCH_A;
459 s->state = SSL3_ST_SW_KEY_EXCH_A;
464 case SSL3_ST_SW_KEY_EXCH_A:
465 case SSL3_ST_SW_KEY_EXCH_B:
466 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
469 * clear this, it may get reset by
470 * send_server_key_exchange
472 s->s3->tmp.use_rsa_tmp = 0;
475 * only send if a DH key exchange or RSA but we have a sign only
480 * PSK: send ServerKeyExchange if PSK identity hint if
483 #ifndef OPENSSL_NO_PSK
484 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
486 || (alg_k & SSL_kDHE)
487 || (alg_k & SSL_kECDHE)
488 || ((alg_k & SSL_kRSA)
489 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
490 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
491 && EVP_PKEY_size(s->cert->pkeys
492 [SSL_PKEY_RSA_ENC].privatekey) *
493 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
498 dtls1_start_timer(s);
499 ret = ssl3_send_server_key_exchange(s);
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) ||
514 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
515 * during re-negotiation:
517 ((s->session->peer != NULL) &&
518 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
520 * never request cert in anonymous ciphersuites (see
521 * section "Certificate request" in SSL 3 drafts and in
524 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
526 * ... except when the application insists on
527 * verification (against the specs, but s3_clnt.c accepts
530 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
532 * never request cert in Kerberos ciphersuites
534 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
536 * With normal PSK Certificates and Certificate Requests
539 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
540 /* no cert request */
542 s->s3->tmp.cert_request = 0;
543 s->state = SSL3_ST_SW_SRVR_DONE_A;
544 #ifndef OPENSSL_NO_SCTP
545 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
546 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
547 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
551 s->s3->tmp.cert_request = 1;
552 dtls1_start_timer(s);
553 ret = ssl3_send_certificate_request(s);
556 s->state = SSL3_ST_SW_SRVR_DONE_A;
557 # ifndef OPENSSL_NO_SCTP
558 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;
567 case SSL3_ST_SW_SRVR_DONE_A:
568 case SSL3_ST_SW_SRVR_DONE_B:
569 dtls1_start_timer(s);
570 ret = ssl3_send_server_done(s);
573 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
574 s->state = SSL3_ST_SW_FLUSH;
578 case SSL3_ST_SW_FLUSH:
579 s->rwstate = SSL_WRITING;
580 if (BIO_flush(s->wbio) <= 0) {
582 * If the write error was fatal, stop trying
584 if (!BIO_should_retry(s->wbio)) {
585 s->rwstate = SSL_NOTHING;
586 s->state = s->s3->tmp.next_state;
592 s->rwstate = SSL_NOTHING;
593 s->state = s->s3->tmp.next_state;
596 case SSL3_ST_SR_CERT_A:
597 case SSL3_ST_SR_CERT_B:
598 if (s->s3->tmp.cert_request) {
599 ret = ssl3_get_client_certificate(s);
604 s->state = SSL3_ST_SR_KEY_EXCH_A;
607 case SSL3_ST_SR_KEY_EXCH_A:
608 case SSL3_ST_SR_KEY_EXCH_B:
609 ret = ssl3_get_client_key_exchange(s);
612 #ifndef OPENSSL_NO_SCTP
614 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
617 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
618 DTLS1_SCTP_AUTH_LABEL);
620 SSL_export_keying_material(s, sctpauthkey,
621 sizeof(sctpauthkey), labelbuffer,
622 sizeof(labelbuffer), NULL, 0, 0);
624 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
625 sizeof(sctpauthkey), sctpauthkey);
628 s->state = SSL3_ST_SR_CERT_VRFY_A;
633 * For the ECDH ciphersuites when the client sends its ECDH
634 * pub key in a certificate, the CertificateVerify message is
637 s->state = SSL3_ST_SR_FINISHED_A;
639 } else if (SSL_USE_SIGALGS(s)) {
640 s->state = SSL3_ST_SR_CERT_VRFY_A;
642 if (!s->session->peer)
644 if (!s->s3->handshake_buffer) {
645 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
649 * For sigalgs freeze the handshake buffer. If we support
650 * extms we've done this already.
652 if (!(s->s3->flags & SSL_SESS_FLAG_EXTMS)) {
653 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
654 if (!ssl3_digest_cached_records(s))
658 s->state = SSL3_ST_SR_CERT_VRFY_A;
662 * We need to get hashes here so if there is a client cert,
665 s->method->ssl3_enc->cert_verify_mac(s,
670 s->method->ssl3_enc->cert_verify_mac(s, NID_sha1,
673 [MD5_DIGEST_LENGTH]));
677 case SSL3_ST_SR_CERT_VRFY_A:
678 case SSL3_ST_SR_CERT_VRFY_B:
680 * This *should* be the first time we enable CCS, but be
681 * extra careful about surrounding code changes. We need
682 * to set this here because we don't know if we're
683 * expecting a CertificateVerify or not.
685 if (!s->s3->change_cipher_spec)
686 s->d1->change_cipher_spec_ok = 1;
687 /* we should decide if we expected this one */
688 ret = ssl3_get_cert_verify(s);
691 #ifndef OPENSSL_NO_SCTP
692 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
693 state == SSL_ST_RENEGOTIATE)
694 s->state = DTLS1_SCTP_ST_SR_READ_SOCK;
697 s->state = SSL3_ST_SR_FINISHED_A;
701 case SSL3_ST_SR_FINISHED_A:
702 case SSL3_ST_SR_FINISHED_B:
704 * Enable CCS for resumed handshakes.
705 * In a full handshake, we end up here through
706 * SSL3_ST_SR_CERT_VRFY_B, so change_cipher_spec_ok was
707 * already set. Receiving a CCS clears the flag, so make
708 * sure not to re-enable it to ban duplicates.
709 * s->s3->change_cipher_spec is set when a CCS is
710 * processed in d1_pkt.c, and remains set until
711 * the client's Finished message is read.
713 if (!s->s3->change_cipher_spec)
714 s->d1->change_cipher_spec_ok = 1;
715 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
716 SSL3_ST_SR_FINISHED_B);
721 s->state = SSL_ST_OK;
722 #ifndef OPENSSL_NO_TLSEXT
723 else if (s->tlsext_ticket_expected)
724 s->state = SSL3_ST_SW_SESSION_TICKET_A;
727 s->state = SSL3_ST_SW_CHANGE_A;
731 #ifndef OPENSSL_NO_TLSEXT
732 case SSL3_ST_SW_SESSION_TICKET_A:
733 case SSL3_ST_SW_SESSION_TICKET_B:
734 ret = ssl3_send_newsession_ticket(s);
737 s->state = SSL3_ST_SW_CHANGE_A;
741 case SSL3_ST_SW_CERT_STATUS_A:
742 case SSL3_ST_SW_CERT_STATUS_B:
743 ret = ssl3_send_cert_status(s);
746 s->state = SSL3_ST_SW_KEY_EXCH_A;
752 case SSL3_ST_SW_CHANGE_A:
753 case SSL3_ST_SW_CHANGE_B:
755 s->session->cipher = s->s3->tmp.new_cipher;
756 if (!s->method->ssl3_enc->setup_key_block(s)) {
761 ret = dtls1_send_change_cipher_spec(s,
763 SSL3_ST_SW_CHANGE_B);
768 #ifndef OPENSSL_NO_SCTP
771 * Change to new shared key of SCTP-Auth, will be ignored if
774 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
779 s->state = SSL3_ST_SW_FINISHED_A;
782 if (!s->method->ssl3_enc->change_cipher_state(s,
783 SSL3_CHANGE_CIPHER_SERVER_WRITE))
789 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
792 case SSL3_ST_SW_FINISHED_A:
793 case SSL3_ST_SW_FINISHED_B:
794 ret = ssl3_send_finished(s,
795 SSL3_ST_SW_FINISHED_A,
796 SSL3_ST_SW_FINISHED_B,
798 ssl3_enc->server_finished_label,
800 ssl3_enc->server_finished_label_len);
803 s->state = SSL3_ST_SW_FLUSH;
805 s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A;
807 #ifndef OPENSSL_NO_SCTP
809 * Change to new shared key of SCTP-Auth, will be ignored if
812 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
816 s->s3->tmp.next_state = SSL_ST_OK;
817 #ifndef OPENSSL_NO_SCTP
818 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);
831 /* remove buffering on output */
832 ssl_free_wbio_buffer(s);
836 if (s->renegotiate == 2) { /* skipped if we just sent a
841 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
843 s->ctx->stats.sess_accept_good++;
845 s->handshake_func = dtls1_accept;
848 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
853 /* done handshaking, next message is client hello */
854 s->d1->handshake_read_seq = 0;
855 /* next message is server hello */
856 s->d1->handshake_write_seq = 0;
857 s->d1->next_handshake_write_seq = 0;
862 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE);
868 if (!s->s3->tmp.reuse_message && !skip) {
870 if ((ret = BIO_flush(s->wbio)) <= 0)
874 if ((cb != NULL) && (s->state != state)) {
875 new_state = s->state;
877 cb(s, SSL_CB_ACCEPT_LOOP, 1);
878 s->state = new_state;
884 /* BIO_flush(s->wbio); */
887 #ifndef OPENSSL_NO_SCTP
889 * Notify SCTP BIO socket to leave handshake mode and prevent stream
890 * identifier other than 0. Will be ignored if no SCTP is used.
892 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
893 s->in_handshake, NULL);
897 cb(s, SSL_CB_ACCEPT_EXIT, ret);
901 int dtls1_send_hello_verify_request(SSL *s)
903 unsigned int msg_len;
904 unsigned char *msg, *buf, *p;
906 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) {
907 buf = (unsigned char *)s->init_buf->data;
909 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
910 /* Always use DTLS 1.0 version: see RFC 6347 */
911 *(p++) = DTLS1_VERSION >> 8;
912 *(p++) = DTLS1_VERSION & 0xFF;
914 if (s->ctx->app_gen_cookie_cb == NULL ||
915 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
916 &(s->d1->cookie_len)) == 0) {
917 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,
918 ERR_R_INTERNAL_ERROR);
922 *(p++) = (unsigned char)s->d1->cookie_len;
923 memcpy(p, s->d1->cookie, s->d1->cookie_len);
924 p += s->d1->cookie_len;
927 dtls1_set_message_header(s, buf,
928 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0,
931 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
932 /* number of bytes to write */
933 s->init_num = p - buf;
937 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
938 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));