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))
190 s->d1->listen = listen;
191 #ifndef OPENSSL_NO_SCTP
193 * Notify SCTP BIO socket to enter handshake mode and prevent stream
194 * identifier other than 0. Will be ignored if no SCTP is used.
196 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
197 s->in_handshake, NULL);
200 if (s->cert == NULL) {
201 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET);
204 #ifndef OPENSSL_NO_HEARTBEATS
206 * If we're awaiting a HeartbeatResponse, pretend we already got and
207 * don't await it anymore, because Heartbeats don't make sense during
210 if (s->tlsext_hb_pending) {
212 s->tlsext_hb_pending = 0;
221 case SSL_ST_RENEGOTIATE:
223 /* s->state=SSL_ST_ACCEPT; */
227 case SSL_ST_BEFORE | SSL_ST_ACCEPT:
228 case SSL_ST_OK | SSL_ST_ACCEPT:
232 cb(s, SSL_CB_HANDSHAKE_START, 1);
234 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
235 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
238 s->type = SSL_ST_ACCEPT;
240 if (s->init_buf == NULL) {
241 if ((buf = BUF_MEM_new()) == NULL) {
243 s->state = SSL_ST_ERR;
246 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
249 s->state = SSL_ST_ERR;
255 if (!ssl3_setup_buffers(s)) {
257 s->state = SSL_ST_ERR;
262 s->d1->change_cipher_spec_ok = 0;
264 * Should have been reset by ssl3_get_finished, too.
266 s->s3->change_cipher_spec = 0;
268 if (s->state != SSL_ST_RENEGOTIATE) {
270 * Ok, we now need to push on a buffering BIO so that the
271 * output is sent in a way that TCP likes :-) ...but not with
274 #ifndef OPENSSL_NO_SCTP
275 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
277 if (!ssl_init_wbio_buffer(s, 1)) {
279 s->state = SSL_ST_ERR;
283 ssl3_init_finished_mac(s);
284 s->state = SSL3_ST_SR_CLNT_HELLO_A;
285 s->ctx->stats.sess_accept++;
288 * s->state == SSL_ST_RENEGOTIATE, we will just send a
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);
306 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
307 s->state = SSL3_ST_SW_FLUSH;
310 ssl3_init_finished_mac(s);
313 case SSL3_ST_SW_HELLO_REQ_C:
314 s->state = SSL_ST_OK;
317 case SSL3_ST_SR_CLNT_HELLO_A:
318 case SSL3_ST_SR_CLNT_HELLO_B:
319 case SSL3_ST_SR_CLNT_HELLO_C:
322 ret = ssl3_get_client_hello(s);
327 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
328 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
330 s->state = SSL3_ST_SW_SRVR_HELLO_A;
335 * Reflect ClientHello sequence to remain stateless while
339 memcpy(s->s3->write_sequence, s->s3->read_sequence,
340 sizeof(s->s3->write_sequence));
343 /* If we're just listening, stop here */
344 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) {
348 * Set expected sequence numbers to continue the handshake.
350 s->d1->handshake_read_seq = 2;
351 s->d1->handshake_write_seq = 1;
352 s->d1->next_handshake_write_seq = 1;
358 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
359 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
361 ret = dtls1_send_hello_verify_request(s);
364 s->state = SSL3_ST_SW_FLUSH;
365 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
367 /* HelloVerifyRequest resets Finished MAC */
368 if (s->version != DTLS1_BAD_VER)
369 ssl3_init_finished_mac(s);
372 #ifndef OPENSSL_NO_SCTP
373 case DTLS1_SCTP_ST_SR_READ_SOCK:
375 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
376 s->s3->in_read_app_data = 2;
377 s->rwstate = SSL_READING;
378 BIO_clear_retry_flags(SSL_get_rbio(s));
379 BIO_set_retry_read(SSL_get_rbio(s));
384 s->state = SSL3_ST_SR_FINISHED_A;
387 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
388 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
393 if (s->d1->next_state != SSL_ST_OK) {
394 s->s3->in_read_app_data = 2;
395 s->rwstate = SSL_READING;
396 BIO_clear_retry_flags(SSL_get_rbio(s));
397 BIO_set_retry_read(SSL_get_rbio(s));
403 s->state = s->d1->next_state;
407 case SSL3_ST_SW_SRVR_HELLO_A:
408 case SSL3_ST_SW_SRVR_HELLO_B:
410 dtls1_start_timer(s);
411 ret = ssl3_send_server_hello(s);
416 #ifndef OPENSSL_NO_SCTP
418 * Add new shared key for SCTP-Auth, will be ignored if no
421 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
422 DTLS1_SCTP_AUTH_LABEL);
424 if (SSL_export_keying_material(s, sctpauthkey,
425 sizeof(sctpauthkey), labelbuffer,
426 sizeof(labelbuffer), NULL, 0, 0) <= 0) {
428 s->state = SSL_ST_ERR;
432 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
433 sizeof(sctpauthkey), sctpauthkey);
435 #ifndef OPENSSL_NO_TLSEXT
436 if (s->tlsext_ticket_expected)
437 s->state = SSL3_ST_SW_SESSION_TICKET_A;
439 s->state = SSL3_ST_SW_CHANGE_A;
441 s->state = SSL3_ST_SW_CHANGE_A;
444 s->state = SSL3_ST_SW_CERT_A;
448 case SSL3_ST_SW_CERT_A:
449 case SSL3_ST_SW_CERT_B:
450 /* Check if it is anon DH or normal PSK */
451 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
452 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
453 dtls1_start_timer(s);
454 ret = ssl3_send_server_certificate(s);
457 #ifndef OPENSSL_NO_TLSEXT
458 if (s->tlsext_status_expected)
459 s->state = SSL3_ST_SW_CERT_STATUS_A;
461 s->state = SSL3_ST_SW_KEY_EXCH_A;
464 s->state = SSL3_ST_SW_KEY_EXCH_A;
470 s->state = SSL3_ST_SW_KEY_EXCH_A;
475 case SSL3_ST_SW_KEY_EXCH_A:
476 case SSL3_ST_SW_KEY_EXCH_B:
477 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
480 * clear this, it may get reset by
481 * send_server_key_exchange
483 s->s3->tmp.use_rsa_tmp = 0;
486 * only send if a DH key exchange or RSA but we have a sign only
491 * PSK: send ServerKeyExchange if PSK identity hint if
494 #ifndef OPENSSL_NO_PSK
495 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
497 || (alg_k & SSL_kDHE)
498 || (alg_k & SSL_kEECDH)
499 || ((alg_k & SSL_kRSA)
500 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
501 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
502 && EVP_PKEY_size(s->cert->pkeys
503 [SSL_PKEY_RSA_ENC].privatekey) *
504 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
509 dtls1_start_timer(s);
510 ret = ssl3_send_server_key_exchange(s);
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) ||
525 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
526 * during re-negotiation:
528 ((s->session->peer != NULL) &&
529 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
531 * never request cert in anonymous ciphersuites (see
532 * section "Certificate request" in SSL 3 drafts and in
535 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
537 * ... except when the application insists on
538 * verification (against the specs, but s3_clnt.c accepts
541 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
543 * never request cert in Kerberos ciphersuites
545 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
547 * With normal PSK Certificates and Certificate Requests
550 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
551 /* no cert request */
553 s->s3->tmp.cert_request = 0;
554 s->state = SSL3_ST_SW_SRVR_DONE_A;
555 #ifndef OPENSSL_NO_SCTP
556 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
557 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
558 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
562 s->s3->tmp.cert_request = 1;
563 dtls1_start_timer(s);
564 ret = ssl3_send_certificate_request(s);
567 #ifndef NETSCAPE_HANG_BUG
568 s->state = SSL3_ST_SW_SRVR_DONE_A;
569 # ifndef OPENSSL_NO_SCTP
570 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
571 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
572 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
576 s->state = SSL3_ST_SW_FLUSH;
577 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
578 # ifndef OPENSSL_NO_SCTP
579 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
580 s->d1->next_state = s->s3->tmp.next_state;
581 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
589 case SSL3_ST_SW_SRVR_DONE_A:
590 case SSL3_ST_SW_SRVR_DONE_B:
591 dtls1_start_timer(s);
592 ret = ssl3_send_server_done(s);
595 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
596 s->state = SSL3_ST_SW_FLUSH;
600 case SSL3_ST_SW_FLUSH:
601 s->rwstate = SSL_WRITING;
602 if (BIO_flush(s->wbio) <= 0) {
604 * If the write error was fatal, stop trying
606 if (!BIO_should_retry(s->wbio)) {
607 s->rwstate = SSL_NOTHING;
608 s->state = s->s3->tmp.next_state;
614 s->rwstate = SSL_NOTHING;
615 s->state = s->s3->tmp.next_state;
618 case SSL3_ST_SR_CERT_A:
619 case SSL3_ST_SR_CERT_B:
620 if (s->s3->tmp.cert_request) {
621 ret = ssl3_get_client_certificate(s);
626 s->state = SSL3_ST_SR_KEY_EXCH_A;
629 case SSL3_ST_SR_KEY_EXCH_A:
630 case SSL3_ST_SR_KEY_EXCH_B:
631 ret = ssl3_get_client_key_exchange(s);
634 #ifndef OPENSSL_NO_SCTP
636 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
639 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
640 DTLS1_SCTP_AUTH_LABEL);
642 if (SSL_export_keying_material(s, sctpauthkey,
643 sizeof(sctpauthkey), labelbuffer,
644 sizeof(labelbuffer), NULL, 0, 0) <= 0) {
646 s->state = SSL_ST_ERR;
650 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
651 sizeof(sctpauthkey), sctpauthkey);
654 s->state = SSL3_ST_SR_CERT_VRFY_A;
659 * For the ECDH ciphersuites when the client sends its ECDH
660 * pub key in a certificate, the CertificateVerify message is
663 s->state = SSL3_ST_SR_FINISHED_A;
665 } else if (SSL_USE_SIGALGS(s)) {
666 s->state = SSL3_ST_SR_CERT_VRFY_A;
668 if (!s->session->peer)
671 * For sigalgs freeze the handshake buffer at this point and
672 * digest cached records.
674 if (!s->s3->handshake_buffer) {
675 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
676 s->state = SSL_ST_ERR;
679 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
680 if (!ssl3_digest_cached_records(s)) {
681 s->state = SSL_ST_ERR;
685 s->state = SSL3_ST_SR_CERT_VRFY_A;
689 * We need to get hashes here so if there is a client cert,
692 s->method->ssl3_enc->cert_verify_mac(s,
697 s->method->ssl3_enc->cert_verify_mac(s, NID_sha1,
700 [MD5_DIGEST_LENGTH]));
704 case SSL3_ST_SR_CERT_VRFY_A:
705 case SSL3_ST_SR_CERT_VRFY_B:
706 ret = ssl3_get_cert_verify(s);
709 #ifndef OPENSSL_NO_SCTP
710 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
711 state == SSL_ST_RENEGOTIATE)
712 s->state = DTLS1_SCTP_ST_SR_READ_SOCK;
715 s->state = SSL3_ST_SR_FINISHED_A;
719 case SSL3_ST_SR_FINISHED_A:
720 case SSL3_ST_SR_FINISHED_B:
722 * Enable CCS. Receiving a CCS clears the flag, so make
723 * sure not to re-enable it to ban duplicates. This *should* be the
724 * first time we have received one - but we check anyway to be
726 * s->s3->change_cipher_spec is set when a CCS is
727 * processed in d1_pkt.c, and remains set until
728 * the client's Finished message is read.
730 if (!s->s3->change_cipher_spec)
731 s->d1->change_cipher_spec_ok = 1;
732 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
733 SSL3_ST_SR_FINISHED_B);
738 s->state = SSL_ST_OK;
739 #ifndef OPENSSL_NO_TLSEXT
740 else if (s->tlsext_ticket_expected)
741 s->state = SSL3_ST_SW_SESSION_TICKET_A;
744 s->state = SSL3_ST_SW_CHANGE_A;
748 #ifndef OPENSSL_NO_TLSEXT
749 case SSL3_ST_SW_SESSION_TICKET_A:
750 case SSL3_ST_SW_SESSION_TICKET_B:
751 ret = ssl3_send_newsession_ticket(s);
754 s->state = SSL3_ST_SW_CHANGE_A;
758 case SSL3_ST_SW_CERT_STATUS_A:
759 case SSL3_ST_SW_CERT_STATUS_B:
760 ret = ssl3_send_cert_status(s);
763 s->state = SSL3_ST_SW_KEY_EXCH_A;
769 case SSL3_ST_SW_CHANGE_A:
770 case SSL3_ST_SW_CHANGE_B:
772 s->session->cipher = s->s3->tmp.new_cipher;
773 if (!s->method->ssl3_enc->setup_key_block(s)) {
775 s->state = SSL_ST_ERR;
779 ret = dtls1_send_change_cipher_spec(s,
781 SSL3_ST_SW_CHANGE_B);
786 #ifndef OPENSSL_NO_SCTP
789 * Change to new shared key of SCTP-Auth, will be ignored if
792 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
797 s->state = SSL3_ST_SW_FINISHED_A;
800 if (!s->method->ssl3_enc->change_cipher_state(s,
801 SSL3_CHANGE_CIPHER_SERVER_WRITE))
804 s->state = SSL_ST_ERR;
808 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
811 case SSL3_ST_SW_FINISHED_A:
812 case SSL3_ST_SW_FINISHED_B:
813 ret = ssl3_send_finished(s,
814 SSL3_ST_SW_FINISHED_A,
815 SSL3_ST_SW_FINISHED_B,
817 ssl3_enc->server_finished_label,
819 ssl3_enc->server_finished_label_len);
822 s->state = SSL3_ST_SW_FLUSH;
824 s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A;
826 #ifndef OPENSSL_NO_SCTP
828 * Change to new shared key of SCTP-Auth, will be ignored if
831 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
835 s->s3->tmp.next_state = SSL_ST_OK;
836 #ifndef OPENSSL_NO_SCTP
837 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
838 s->d1->next_state = s->s3->tmp.next_state;
839 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
847 /* clean a few things up */
848 ssl3_cleanup_key_block(s);
851 BUF_MEM_free(s->init_buf);
855 /* remove buffering on output */
856 ssl_free_wbio_buffer(s);
860 if (s->renegotiate == 2) { /* skipped if we just sent a
865 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
867 s->ctx->stats.sess_accept_good++;
869 s->handshake_func = dtls1_accept;
872 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
877 /* done handshaking, next message is client hello */
878 s->d1->handshake_read_seq = 0;
879 /* next message is server hello */
880 s->d1->handshake_write_seq = 0;
881 s->d1->next_handshake_write_seq = 0;
887 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE);
893 if (!s->s3->tmp.reuse_message && !skip) {
895 if ((ret = BIO_flush(s->wbio)) <= 0)
899 if ((cb != NULL) && (s->state != state)) {
900 new_state = s->state;
902 cb(s, SSL_CB_ACCEPT_LOOP, 1);
903 s->state = new_state;
909 /* BIO_flush(s->wbio); */
912 #ifndef OPENSSL_NO_SCTP
914 * Notify SCTP BIO socket to leave handshake mode and prevent stream
915 * identifier other than 0. Will be ignored if no SCTP is used.
917 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
918 s->in_handshake, NULL);
922 cb(s, SSL_CB_ACCEPT_EXIT, ret);
926 int dtls1_send_hello_verify_request(SSL *s)
928 unsigned int msg_len;
929 unsigned char *msg, *buf, *p;
931 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) {
932 buf = (unsigned char *)s->init_buf->data;
934 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
935 /* Always use DTLS 1.0 version: see RFC 6347 */
936 *(p++) = DTLS1_VERSION >> 8;
937 *(p++) = DTLS1_VERSION & 0xFF;
939 if (s->ctx->app_gen_cookie_cb == NULL ||
940 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
941 &(s->d1->cookie_len)) == 0) {
942 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,
943 ERR_R_INTERNAL_ERROR);
944 s->state = SSL_ST_ERR;
948 *(p++) = (unsigned char)s->d1->cookie_len;
949 memcpy(p, s->d1->cookie, s->d1->cookie_len);
950 p += s->d1->cookie_len;
953 dtls1_set_message_header(s, buf,
954 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0,
957 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
958 /* number of bytes to write */
959 s->init_num = p - buf;
963 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
964 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));