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());
140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
142 ssl_undefined_function, dtls1_get_server_method)
144 int dtls1_accept(SSL *s)
147 unsigned long Time = (unsigned long)time(NULL);
148 void (*cb) (const SSL *ssl, int type, int val) = NULL;
151 int new_state, state, skip = 0;
153 #ifndef OPENSSL_NO_SCTP
154 unsigned char sctpauthkey[64];
155 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
158 RAND_add(&Time, sizeof(Time), 0);
162 if (s->info_callback != NULL)
163 cb = s->info_callback;
164 else if (s->ctx->info_callback != NULL)
165 cb = s->ctx->info_callback;
167 listen = s->d1->listen;
169 /* init things to blank */
171 if (!SSL_in_init(s) || SSL_in_before(s))
174 s->d1->listen = listen;
175 #ifndef OPENSSL_NO_SCTP
177 * Notify SCTP BIO socket to enter handshake mode and prevent stream
178 * identifier other than 0. Will be ignored if no SCTP is used.
180 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
181 s->in_handshake, NULL);
184 if (s->cert == NULL) {
185 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET);
188 #ifndef OPENSSL_NO_HEARTBEATS
190 * If we're awaiting a HeartbeatResponse, pretend we already got and
191 * don't await it anymore, because Heartbeats don't make sense during
194 if (s->tlsext_hb_pending) {
196 s->tlsext_hb_pending = 0;
205 case SSL_ST_RENEGOTIATE:
207 /* s->state=SSL_ST_ACCEPT; */
211 case SSL_ST_BEFORE | SSL_ST_ACCEPT:
212 case SSL_ST_OK | SSL_ST_ACCEPT:
216 cb(s, SSL_CB_HANDSHAKE_START, 1);
218 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
219 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
222 s->type = SSL_ST_ACCEPT;
224 if (s->init_buf == NULL) {
225 if ((buf = BUF_MEM_new()) == NULL) {
227 s->state = SSL_ST_ERR;
230 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
233 s->state = SSL_ST_ERR;
239 if (!ssl3_setup_buffers(s)) {
241 s->state = SSL_ST_ERR;
246 s->d1->change_cipher_spec_ok = 0;
248 * Should have been reset by ssl3_get_finished, too.
250 s->s3->change_cipher_spec = 0;
252 if (s->state != SSL_ST_RENEGOTIATE) {
254 * Ok, we now need to push on a buffering BIO so that the
255 * output is sent in a way that TCP likes :-) ...but not with
258 #ifndef OPENSSL_NO_SCTP
259 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
261 if (!ssl_init_wbio_buffer(s, 1)) {
263 s->state = SSL_ST_ERR;
267 ssl3_init_finished_mac(s);
268 s->state = SSL3_ST_SR_CLNT_HELLO_A;
269 s->ctx->stats.sess_accept++;
272 * s->state == SSL_ST_RENEGOTIATE, we will just send a
275 s->ctx->stats.sess_accept_renegotiate++;
276 s->state = SSL3_ST_SW_HELLO_REQ_A;
281 case SSL3_ST_SW_HELLO_REQ_A:
282 case SSL3_ST_SW_HELLO_REQ_B:
285 dtls1_clear_sent_buffer(s);
286 dtls1_start_timer(s);
287 ret = dtls1_send_hello_request(s);
290 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
291 s->state = SSL3_ST_SW_FLUSH;
294 ssl3_init_finished_mac(s);
297 case SSL3_ST_SW_HELLO_REQ_C:
298 s->state = SSL_ST_OK;
301 case SSL3_ST_SR_CLNT_HELLO_A:
302 case SSL3_ST_SR_CLNT_HELLO_B:
303 case SSL3_ST_SR_CLNT_HELLO_C:
306 ret = ssl3_get_client_hello(s);
311 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
312 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
314 s->state = SSL3_ST_SW_SRVR_HELLO_A;
319 * Reflect ClientHello sequence to remain stateless while
323 memcpy(s->s3->write_sequence, s->s3->read_sequence,
324 sizeof(s->s3->write_sequence));
327 /* If we're just listening, stop here */
328 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) {
332 * Set expected sequence numbers to continue the handshake.
334 s->d1->handshake_read_seq = 2;
335 s->d1->handshake_write_seq = 1;
336 s->d1->next_handshake_write_seq = 1;
342 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
343 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
345 ret = dtls1_send_hello_verify_request(s);
348 s->state = SSL3_ST_SW_FLUSH;
349 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
351 /* HelloVerifyRequest resets Finished MAC */
352 if (s->version != DTLS1_BAD_VER)
353 ssl3_init_finished_mac(s);
356 #ifndef OPENSSL_NO_SCTP
357 case DTLS1_SCTP_ST_SR_READ_SOCK:
359 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
360 s->s3->in_read_app_data = 2;
361 s->rwstate = SSL_READING;
362 BIO_clear_retry_flags(SSL_get_rbio(s));
363 BIO_set_retry_read(SSL_get_rbio(s));
368 s->state = SSL3_ST_SR_FINISHED_A;
371 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
372 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
377 if (s->d1->next_state != SSL_ST_OK) {
378 s->s3->in_read_app_data = 2;
379 s->rwstate = SSL_READING;
380 BIO_clear_retry_flags(SSL_get_rbio(s));
381 BIO_set_retry_read(SSL_get_rbio(s));
387 s->state = s->d1->next_state;
391 case SSL3_ST_SW_SRVR_HELLO_A:
392 case SSL3_ST_SW_SRVR_HELLO_B:
394 dtls1_start_timer(s);
395 ret = dtls1_send_server_hello(s);
400 #ifndef OPENSSL_NO_SCTP
402 * Add new shared key for SCTP-Auth, will be ignored if no
405 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
406 DTLS1_SCTP_AUTH_LABEL);
408 SSL_export_keying_material(s, sctpauthkey,
409 sizeof(sctpauthkey), labelbuffer,
410 sizeof(labelbuffer), NULL, 0, 0);
412 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
413 sizeof(sctpauthkey), sctpauthkey);
415 #ifndef OPENSSL_NO_TLSEXT
416 if (s->tlsext_ticket_expected)
417 s->state = SSL3_ST_SW_SESSION_TICKET_A;
419 s->state = SSL3_ST_SW_CHANGE_A;
421 s->state = SSL3_ST_SW_CHANGE_A;
424 s->state = SSL3_ST_SW_CERT_A;
428 case SSL3_ST_SW_CERT_A:
429 case SSL3_ST_SW_CERT_B:
430 /* Check if it is anon DH or normal PSK */
431 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
432 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
433 dtls1_start_timer(s);
434 ret = dtls1_send_server_certificate(s);
437 #ifndef OPENSSL_NO_TLSEXT
438 if (s->tlsext_status_expected)
439 s->state = SSL3_ST_SW_CERT_STATUS_A;
441 s->state = SSL3_ST_SW_KEY_EXCH_A;
444 s->state = SSL3_ST_SW_KEY_EXCH_A;
450 s->state = SSL3_ST_SW_KEY_EXCH_A;
455 case SSL3_ST_SW_KEY_EXCH_A:
456 case SSL3_ST_SW_KEY_EXCH_B:
457 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
460 * clear this, it may get reset by
461 * send_server_key_exchange
463 s->s3->tmp.use_rsa_tmp = 0;
466 * only send if a DH key exchange or RSA but we have a sign only
471 * PSK: send ServerKeyExchange if PSK identity hint if
474 #ifndef OPENSSL_NO_PSK
475 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
477 || (alg_k & SSL_kEDH)
478 || (alg_k & SSL_kEECDH)
479 || ((alg_k & SSL_kRSA)
480 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
481 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
482 && EVP_PKEY_size(s->cert->pkeys
483 [SSL_PKEY_RSA_ENC].privatekey) *
484 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
489 dtls1_start_timer(s);
490 ret = dtls1_send_server_key_exchange(s);
496 s->state = SSL3_ST_SW_CERT_REQ_A;
500 case SSL3_ST_SW_CERT_REQ_A:
501 case SSL3_ST_SW_CERT_REQ_B:
502 if ( /* don't request cert unless asked for it: */
503 !(s->verify_mode & SSL_VERIFY_PEER) ||
505 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
506 * during re-negotiation:
508 ((s->session->peer != NULL) &&
509 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
511 * never request cert in anonymous ciphersuites (see
512 * section "Certificate request" in SSL 3 drafts and in
515 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
517 * ... except when the application insists on
518 * verification (against the specs, but s3_clnt.c accepts
521 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
523 * never request cert in Kerberos ciphersuites
525 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
527 * With normal PSK Certificates and Certificate Requests
530 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
531 /* no cert request */
533 s->s3->tmp.cert_request = 0;
534 s->state = SSL3_ST_SW_SRVR_DONE_A;
535 #ifndef OPENSSL_NO_SCTP
536 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
537 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
538 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
542 s->s3->tmp.cert_request = 1;
543 dtls1_start_timer(s);
544 ret = dtls1_send_certificate_request(s);
547 #ifndef NETSCAPE_HANG_BUG
548 s->state = SSL3_ST_SW_SRVR_DONE_A;
549 # ifndef OPENSSL_NO_SCTP
550 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
551 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
552 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
556 s->state = SSL3_ST_SW_FLUSH;
557 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
558 # ifndef OPENSSL_NO_SCTP
559 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
560 s->d1->next_state = s->s3->tmp.next_state;
561 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
569 case SSL3_ST_SW_SRVR_DONE_A:
570 case SSL3_ST_SW_SRVR_DONE_B:
571 dtls1_start_timer(s);
572 ret = dtls1_send_server_done(s);
575 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
576 s->state = SSL3_ST_SW_FLUSH;
580 case SSL3_ST_SW_FLUSH:
581 s->rwstate = SSL_WRITING;
582 if (BIO_flush(s->wbio) <= 0) {
584 * If the write error was fatal, stop trying
586 if (!BIO_should_retry(s->wbio)) {
587 s->rwstate = SSL_NOTHING;
588 s->state = s->s3->tmp.next_state;
594 s->rwstate = SSL_NOTHING;
595 s->state = s->s3->tmp.next_state;
598 case SSL3_ST_SR_CERT_A:
599 case SSL3_ST_SR_CERT_B:
600 /* Check for second client hello (MS SGC) */
601 ret = ssl3_check_client_hello(s);
606 s->state = SSL3_ST_SR_CLNT_HELLO_C;
608 if (s->s3->tmp.cert_request) {
609 ret = ssl3_get_client_certificate(s);
614 s->state = SSL3_ST_SR_KEY_EXCH_A;
618 case SSL3_ST_SR_KEY_EXCH_A:
619 case SSL3_ST_SR_KEY_EXCH_B:
620 ret = ssl3_get_client_key_exchange(s);
623 #ifndef OPENSSL_NO_SCTP
625 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
628 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
629 DTLS1_SCTP_AUTH_LABEL);
631 SSL_export_keying_material(s, sctpauthkey,
632 sizeof(sctpauthkey), labelbuffer,
633 sizeof(labelbuffer), NULL, 0, 0);
635 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
636 sizeof(sctpauthkey), sctpauthkey);
639 s->state = SSL3_ST_SR_CERT_VRFY_A;
644 * For the ECDH ciphersuites when the client sends its ECDH
645 * pub key in a certificate, the CertificateVerify message is
648 s->state = SSL3_ST_SR_FINISHED_A;
651 s->state = SSL3_ST_SR_CERT_VRFY_A;
655 * We need to get hashes here so if there is a client cert,
658 s->method->ssl3_enc->cert_verify_mac(s,
663 s->method->ssl3_enc->cert_verify_mac(s, NID_sha1,
666 [MD5_DIGEST_LENGTH]));
670 case SSL3_ST_SR_CERT_VRFY_A:
671 case SSL3_ST_SR_CERT_VRFY_B:
672 ret = ssl3_get_cert_verify(s);
675 #ifndef OPENSSL_NO_SCTP
676 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
677 state == SSL_ST_RENEGOTIATE)
678 s->state = DTLS1_SCTP_ST_SR_READ_SOCK;
681 s->state = SSL3_ST_SR_FINISHED_A;
685 case SSL3_ST_SR_FINISHED_A:
686 case SSL3_ST_SR_FINISHED_B:
688 * Enable CCS. Receiving a CCS clears the flag, so make
689 * sure not to re-enable it to ban duplicates. This *should* be the
690 * first time we have received one - but we check anyway to be
692 * s->s3->change_cipher_spec is set when a CCS is
693 * processed in d1_pkt.c, and remains set until
694 * the client's Finished message is read.
696 if (!s->s3->change_cipher_spec)
697 s->d1->change_cipher_spec_ok = 1;
698 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
699 SSL3_ST_SR_FINISHED_B);
704 s->state = SSL_ST_OK;
705 #ifndef OPENSSL_NO_TLSEXT
706 else if (s->tlsext_ticket_expected)
707 s->state = SSL3_ST_SW_SESSION_TICKET_A;
710 s->state = SSL3_ST_SW_CHANGE_A;
714 #ifndef OPENSSL_NO_TLSEXT
715 case SSL3_ST_SW_SESSION_TICKET_A:
716 case SSL3_ST_SW_SESSION_TICKET_B:
717 ret = dtls1_send_newsession_ticket(s);
720 s->state = SSL3_ST_SW_CHANGE_A;
724 case SSL3_ST_SW_CERT_STATUS_A:
725 case SSL3_ST_SW_CERT_STATUS_B:
726 ret = ssl3_send_cert_status(s);
729 s->state = SSL3_ST_SW_KEY_EXCH_A;
735 case SSL3_ST_SW_CHANGE_A:
736 case SSL3_ST_SW_CHANGE_B:
738 s->session->cipher = s->s3->tmp.new_cipher;
739 if (!s->method->ssl3_enc->setup_key_block(s)) {
741 s->state = SSL_ST_ERR;
745 ret = dtls1_send_change_cipher_spec(s,
747 SSL3_ST_SW_CHANGE_B);
752 #ifndef OPENSSL_NO_SCTP
755 * Change to new shared key of SCTP-Auth, will be ignored if
758 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
763 s->state = SSL3_ST_SW_FINISHED_A;
766 if (!s->method->ssl3_enc->change_cipher_state(s,
767 SSL3_CHANGE_CIPHER_SERVER_WRITE))
770 s->state = SSL_ST_ERR;
774 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
777 case SSL3_ST_SW_FINISHED_A:
778 case SSL3_ST_SW_FINISHED_B:
779 ret = dtls1_send_finished(s,
780 SSL3_ST_SW_FINISHED_A,
781 SSL3_ST_SW_FINISHED_B,
783 ssl3_enc->server_finished_label,
785 ssl3_enc->server_finished_label_len);
788 s->state = SSL3_ST_SW_FLUSH;
790 s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A;
792 #ifndef OPENSSL_NO_SCTP
794 * Change to new shared key of SCTP-Auth, will be ignored if
797 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
801 s->s3->tmp.next_state = SSL_ST_OK;
802 #ifndef OPENSSL_NO_SCTP
803 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
804 s->d1->next_state = s->s3->tmp.next_state;
805 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
813 /* clean a few things up */
814 ssl3_cleanup_key_block(s);
817 BUF_MEM_free(s->init_buf);
821 /* remove buffering on output */
822 ssl_free_wbio_buffer(s);
826 if (s->renegotiate == 2) { /* skipped if we just sent a
831 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
833 s->ctx->stats.sess_accept_good++;
835 s->handshake_func = dtls1_accept;
838 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
843 /* done handshaking, next message is client hello */
844 s->d1->handshake_read_seq = 0;
845 /* next message is server hello */
846 s->d1->handshake_write_seq = 0;
847 s->d1->next_handshake_write_seq = 0;
848 dtls1_clear_received_buffer(s);
854 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE);
860 if (!s->s3->tmp.reuse_message && !skip) {
862 if ((ret = BIO_flush(s->wbio)) <= 0)
866 if ((cb != NULL) && (s->state != state)) {
867 new_state = s->state;
869 cb(s, SSL_CB_ACCEPT_LOOP, 1);
870 s->state = new_state;
876 /* BIO_flush(s->wbio); */
879 #ifndef OPENSSL_NO_SCTP
881 * Notify SCTP BIO socket to leave handshake mode and prevent stream
882 * identifier other than 0. Will be ignored if no SCTP is used.
884 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
885 s->in_handshake, NULL);
889 cb(s, SSL_CB_ACCEPT_EXIT, ret);
893 int dtls1_send_hello_request(SSL *s)
897 if (s->state == SSL3_ST_SW_HELLO_REQ_A) {
898 p = (unsigned char *)s->init_buf->data;
899 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
901 s->state = SSL3_ST_SW_HELLO_REQ_B;
902 /* number of bytes to write */
903 s->init_num = DTLS1_HM_HEADER_LENGTH;
907 * no need to buffer this message, since there are no retransmit
912 /* SSL3_ST_SW_HELLO_REQ_B */
913 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
916 int dtls1_send_hello_verify_request(SSL *s)
918 unsigned int msg_len;
919 unsigned char *msg, *buf, *p;
921 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) {
922 buf = (unsigned char *)s->init_buf->data;
924 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
925 *(p++) = s->version >> 8;
926 *(p++) = s->version & 0xFF;
928 if (s->ctx->app_gen_cookie_cb == NULL ||
929 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
930 &(s->d1->cookie_len)) == 0) {
931 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,
932 ERR_R_INTERNAL_ERROR);
933 s->state = SSL_ST_ERR;
937 *(p++) = (unsigned char)s->d1->cookie_len;
938 memcpy(p, s->d1->cookie, s->d1->cookie_len);
939 p += s->d1->cookie_len;
942 dtls1_set_message_header(s, buf,
943 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0,
946 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
947 /* number of bytes to write */
948 s->init_num = p - buf;
952 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
953 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
956 int dtls1_send_server_hello(SSL *s)
959 unsigned char *p, *d;
964 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) {
965 buf = (unsigned char *)s->init_buf->data;
966 p = s->s3->server_random;
967 ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE);
968 /* Do the message type and length last */
969 d = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
971 *(p++) = s->version >> 8;
972 *(p++) = s->version & 0xff;
975 memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE);
976 p += SSL3_RANDOM_SIZE;
979 * now in theory we have 3 options to sending back the session id.
980 * If it is a re-use, we send back the old session-id, if it is a new
981 * session, we send back the new session-id or we send back a 0
982 * length session-id if we want it to be single use. Currently I will
983 * not implement the '0' length session-id 12-Jan-98 - I'll now
984 * support the '0' length stuff.
986 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
987 s->session->session_id_length = 0;
989 sl = s->session->session_id_length;
990 if (sl > sizeof s->session->session_id) {
991 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
995 memcpy(p, s->session->session_id, sl);
999 if (s->s3->tmp.new_cipher == NULL)
1001 i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p);
1004 /* put the compression method */
1005 #ifdef OPENSSL_NO_COMP
1008 if (s->s3->tmp.new_compression == NULL)
1011 *(p++) = s->s3->tmp.new_compression->id;
1014 #ifndef OPENSSL_NO_TLSEXT
1015 if (ssl_prepare_serverhello_tlsext(s) <= 0) {
1016 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT);
1020 ssl_add_serverhello_tlsext(s, p,
1021 buf + SSL3_RT_MAX_PLAIN_LENGTH)) ==
1023 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1032 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
1034 s->state = SSL3_ST_SW_SRVR_HELLO_B;
1035 /* number of bytes to write */
1036 s->init_num = p - buf;
1039 /* buffer the message to handle re-xmits */
1040 dtls1_buffer_message(s, 0);
1043 /* SSL3_ST_SW_SRVR_HELLO_B */
1044 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1047 int dtls1_send_server_done(SSL *s)
1051 if (s->state == SSL3_ST_SW_SRVR_DONE_A) {
1052 p = (unsigned char *)s->init_buf->data;
1055 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
1057 s->state = SSL3_ST_SW_SRVR_DONE_B;
1058 /* number of bytes to write */
1059 s->init_num = DTLS1_HM_HEADER_LENGTH;
1062 /* buffer the message to handle re-xmits */
1063 dtls1_buffer_message(s, 0);
1066 /* SSL3_ST_SW_SRVR_DONE_B */
1067 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1070 int dtls1_send_server_key_exchange(SSL *s)
1072 #ifndef OPENSSL_NO_RSA
1076 unsigned char md_buf[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
1079 #ifndef OPENSSL_NO_DH
1080 DH *dh = NULL, *dhp;
1082 #ifndef OPENSSL_NO_ECDH
1083 EC_KEY *ecdh = NULL, *ecdhp;
1084 unsigned char *encodedPoint = NULL;
1087 BN_CTX *bn_ctx = NULL;
1090 unsigned char *p, *d;
1100 EVP_MD_CTX_init(&md_ctx);
1101 if (s->state == SSL3_ST_SW_KEY_EXCH_A) {
1102 type = s->s3->tmp.new_cipher->algorithm_mkey;
1107 r[0] = r[1] = r[2] = r[3] = NULL;
1109 #ifndef OPENSSL_NO_RSA
1110 if (type & SSL_kRSA) {
1111 rsa = cert->rsa_tmp;
1112 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) {
1113 rsa = s->cert->rsa_tmp_cb(s,
1114 SSL_C_IS_EXPORT(s->s3->
1116 SSL_C_EXPORT_PKEYLENGTH(s->s3->
1119 al = SSL_AD_HANDSHAKE_FAILURE;
1120 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1121 SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1125 cert->rsa_tmp = rsa;
1128 al = SSL_AD_HANDSHAKE_FAILURE;
1129 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1130 SSL_R_MISSING_TMP_RSA_KEY);
1135 s->s3->tmp.use_rsa_tmp = 1;
1138 #ifndef OPENSSL_NO_DH
1139 if (type & SSL_kEDH) {
1141 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1142 dhp = s->cert->dh_tmp_cb(s,
1143 SSL_C_IS_EXPORT(s->s3->
1145 SSL_C_EXPORT_PKEYLENGTH(s->s3->
1148 al = SSL_AD_HANDSHAKE_FAILURE;
1149 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1150 SSL_R_MISSING_TMP_DH_KEY);
1154 if (s->s3->tmp.dh != NULL) {
1156 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1157 ERR_R_INTERNAL_ERROR);
1161 if ((dh = DHparams_dup(dhp)) == NULL) {
1162 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
1167 if ((dhp->pub_key == NULL ||
1168 dhp->priv_key == NULL ||
1169 (s->options & SSL_OP_SINGLE_DH_USE))) {
1170 if (!DH_generate_key(dh)) {
1171 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1176 dh->pub_key = BN_dup(dhp->pub_key);
1177 dh->priv_key = BN_dup(dhp->priv_key);
1178 if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) {
1179 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1189 #ifndef OPENSSL_NO_ECDH
1190 if (type & SSL_kEECDH) {
1191 const EC_GROUP *group;
1193 ecdhp = cert->ecdh_tmp;
1194 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL)) {
1195 ecdhp = s->cert->ecdh_tmp_cb(s,
1196 SSL_C_IS_EXPORT(s->s3->
1198 SSL_C_EXPORT_PKEYLENGTH(s->
1199 s3->tmp.new_cipher));
1201 if (ecdhp == NULL) {
1202 al = SSL_AD_HANDSHAKE_FAILURE;
1203 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1204 SSL_R_MISSING_TMP_ECDH_KEY);
1208 if (s->s3->tmp.ecdh != NULL) {
1209 EC_KEY_free(s->s3->tmp.ecdh);
1210 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1211 ERR_R_INTERNAL_ERROR);
1215 /* Duplicate the ECDH structure. */
1216 if (ecdhp == NULL) {
1217 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1220 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) {
1221 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1225 s->s3->tmp.ecdh = ecdh;
1226 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1227 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1228 (s->options & SSL_OP_SINGLE_ECDH_USE)) {
1229 if (!EC_KEY_generate_key(ecdh)) {
1230 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1236 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1237 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1238 (EC_KEY_get0_private_key(ecdh) == NULL)) {
1239 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1243 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1244 (EC_GROUP_get_degree(group) > 163)) {
1245 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1246 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1251 * XXX: For now, we only support ephemeral ECDH keys over named
1252 * (not generic) curves. For supported named curves, curve_id is
1256 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1258 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1259 SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1264 * Encode the public key. First check the size of encoding and
1265 * allocate memory accordingly.
1267 encodedlen = EC_POINT_point2oct(group,
1268 EC_KEY_get0_public_key(ecdh),
1269 POINT_CONVERSION_UNCOMPRESSED,
1272 encodedPoint = (unsigned char *)
1273 OPENSSL_malloc(encodedlen * sizeof(unsigned char));
1274 bn_ctx = BN_CTX_new();
1275 if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
1276 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1277 ERR_R_MALLOC_FAILURE);
1281 encodedlen = EC_POINT_point2oct(group,
1282 EC_KEY_get0_public_key(ecdh),
1283 POINT_CONVERSION_UNCOMPRESSED,
1284 encodedPoint, encodedlen, bn_ctx);
1286 if (encodedlen == 0) {
1287 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1291 BN_CTX_free(bn_ctx);
1295 * XXX: For now, we only support named (not generic) curves in
1296 * ECDH ephemeral key exchanges. In this situation, we need four
1297 * additional bytes to encode the entire ServerECDHParams
1303 * We'll generate the serverKeyExchange message explicitly so we
1304 * can set these to NULLs
1311 #endif /* !OPENSSL_NO_ECDH */
1312 #ifndef OPENSSL_NO_PSK
1313 if (type & SSL_kPSK) {
1315 * reserve size for record length and PSK identity hint
1317 n += 2 + strlen(s->ctx->psk_identity_hint);
1319 #endif /* !OPENSSL_NO_PSK */
1321 al = SSL_AD_HANDSHAKE_FAILURE;
1322 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1323 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1326 for (i = 0; r[i] != NULL; i++) {
1327 nr[i] = BN_num_bytes(r[i]);
1331 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1332 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
1333 if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, NULL))
1335 al = SSL_AD_DECODE_ERROR;
1338 kn = EVP_PKEY_size(pkey);
1344 if (!BUF_MEM_grow_clean(buf, n + DTLS1_HM_HEADER_LENGTH + kn)) {
1345 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_BUF);
1348 d = (unsigned char *)s->init_buf->data;
1349 p = &(d[DTLS1_HM_HEADER_LENGTH]);
1351 for (i = 0; r[i] != NULL; i++) {
1357 #ifndef OPENSSL_NO_ECDH
1358 if (type & SSL_kEECDH) {
1360 * XXX: For now, we only support named (not generic) curves. In
1361 * this situation, the serverKeyExchange message has: [1 byte
1362 * CurveType], [2 byte CurveName] [1 byte length of encoded
1363 * point], followed by the actual encoded point itself
1365 *p = NAMED_CURVE_TYPE;
1373 memcpy((unsigned char *)p,
1374 (unsigned char *)encodedPoint, encodedlen);
1375 OPENSSL_free(encodedPoint);
1376 encodedPoint = NULL;
1381 #ifndef OPENSSL_NO_PSK
1382 if (type & SSL_kPSK) {
1383 /* copy PSK identity hint */
1384 s2n(strlen(s->ctx->psk_identity_hint), p);
1385 strncpy((char *)p, s->ctx->psk_identity_hint,
1386 strlen(s->ctx->psk_identity_hint));
1387 p += strlen(s->ctx->psk_identity_hint);
1394 * n is the length of the params, they start at
1395 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space at the
1398 #ifndef OPENSSL_NO_RSA
1399 if (pkey->type == EVP_PKEY_RSA) {
1402 for (num = 2; num > 0; num--) {
1403 EVP_DigestInit_ex(&md_ctx, (num == 2)
1404 ? s->ctx->md5 : s->ctx->sha1, NULL);
1405 EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
1407 EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
1409 EVP_DigestUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]),
1411 EVP_DigestFinal_ex(&md_ctx, q, (unsigned int *)&i);
1415 if (RSA_sign(NID_md5_sha1, md_buf, j,
1416 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
1417 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_RSA);
1424 #if !defined(OPENSSL_NO_DSA)
1425 if (pkey->type == EVP_PKEY_DSA) {
1427 EVP_SignInit_ex(&md_ctx, EVP_dss1(), NULL);
1428 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]),
1430 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]),
1432 EVP_SignUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), n);
1433 if (!EVP_SignFinal(&md_ctx, &(p[2]),
1434 (unsigned int *)&i, pkey)) {
1435 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_DSA);
1442 #if !defined(OPENSSL_NO_ECDSA)
1443 if (pkey->type == EVP_PKEY_EC) {
1444 /* let's do ECDSA */
1445 EVP_SignInit_ex(&md_ctx, EVP_ecdsa(), NULL);
1446 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]),
1448 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]),
1450 EVP_SignUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), n);
1451 if (!EVP_SignFinal(&md_ctx, &(p[2]),
1452 (unsigned int *)&i, pkey)) {
1453 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1462 /* Is this error check actually needed? */
1463 al = SSL_AD_HANDSHAKE_FAILURE;
1464 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1465 SSL_R_UNKNOWN_PKEY_TYPE);
1470 d = dtls1_set_message_header(s, d,
1471 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1474 * we should now have things packed up, so lets send it off
1476 s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1479 /* buffer the message to handle re-xmits */
1480 dtls1_buffer_message(s, 0);
1483 s->state = SSL3_ST_SW_KEY_EXCH_B;
1484 EVP_MD_CTX_cleanup(&md_ctx);
1485 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1487 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1489 #ifndef OPENSSL_NO_ECDH
1490 if (encodedPoint != NULL)
1491 OPENSSL_free(encodedPoint);
1492 BN_CTX_free(bn_ctx);
1494 EVP_MD_CTX_cleanup(&md_ctx);
1498 int dtls1_send_certificate_request(SSL *s)
1500 unsigned char *p, *d;
1501 int i, j, nl, off, n;
1502 STACK_OF(X509_NAME) *sk = NULL;
1505 unsigned int msg_len;
1507 if (s->state == SSL3_ST_SW_CERT_REQ_A) {
1510 d = p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1512 /* get the list of acceptable cert types */
1514 n = ssl3_get_req_cert_type(s, p);
1523 sk = SSL_get_client_CA_list(s);
1526 for (i = 0; i < sk_X509_NAME_num(sk); i++) {
1527 name = sk_X509_NAME_value(sk, i);
1528 j = i2d_X509_NAME(name, NULL);
1529 if (!BUF_MEM_grow_clean
1530 (buf, DTLS1_HM_HEADER_LENGTH + n + j + 2)) {
1531 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,
1535 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + n]);
1536 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) {
1538 i2d_X509_NAME(name, &p);
1543 i2d_X509_NAME(name, &p);
1552 /* else no CA names */
1553 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + off]);
1556 d = (unsigned char *)buf->data;
1557 *(d++) = SSL3_MT_CERTIFICATE_REQUEST;
1559 s2n(s->d1->handshake_write_seq, d);
1560 s->d1->handshake_write_seq++;
1563 * we should now have things packed up, so lets send it off
1566 s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1568 #ifdef NETSCAPE_HANG_BUG
1569 /* XXX: what to do about this? */
1570 p = (unsigned char *)s->init_buf->data + s->init_num;
1573 *(p++) = SSL3_MT_SERVER_DONE;
1580 /* XDTLS: set message header ? */
1581 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1582 dtls1_set_message_header(s, (void *)s->init_buf->data,
1583 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0,
1586 /* buffer the message to handle re-xmits */
1587 dtls1_buffer_message(s, 0);
1589 s->state = SSL3_ST_SW_CERT_REQ_B;
1592 /* SSL3_ST_SW_CERT_REQ_B */
1593 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1598 int dtls1_send_server_certificate(SSL *s)
1603 if (s->state == SSL3_ST_SW_CERT_A) {
1604 x = ssl_get_server_send_cert(s);
1606 /* VRS: allow null cert if auth == KRB5 */
1607 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1608 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5)) {
1609 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,
1610 ERR_R_INTERNAL_ERROR);
1615 l = dtls1_output_cert_chain(s, x);
1617 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1620 s->state = SSL3_ST_SW_CERT_B;
1621 s->init_num = (int)l;
1624 /* buffer the message to handle re-xmits */
1625 dtls1_buffer_message(s, 0);
1628 /* SSL3_ST_SW_CERT_B */
1629 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1632 #ifndef OPENSSL_NO_TLSEXT
1633 int dtls1_send_newsession_ticket(SSL *s)
1635 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) {
1636 unsigned char *p, *senc, *macstart;
1638 unsigned int hlen, msg_len;
1641 SSL_CTX *tctx = s->initial_ctx;
1642 unsigned char iv[EVP_MAX_IV_LENGTH];
1643 unsigned char key_name[16];
1645 /* get session encoding length */
1646 slen = i2d_SSL_SESSION(s->session, NULL);
1648 * Some length values are 16 bits, so forget it if session is too
1654 * Grow buffer if need be: the length calculation is as follows 12
1655 * (DTLS handshake message header) + 4 (ticket lifetime hint) + 2
1656 * (ticket length) + 16 (key name) + max_iv_len (iv length) +
1657 * session_length + max_enc_block_size (max encrypted session length)
1658 * + max_md_size (HMAC).
1660 if (!BUF_MEM_grow(s->init_buf,
1661 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1662 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1664 senc = OPENSSL_malloc(slen);
1668 i2d_SSL_SESSION(s->session, &p);
1670 p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1671 EVP_CIPHER_CTX_init(&ctx);
1672 HMAC_CTX_init(&hctx);
1674 * Initialize HMAC and cipher contexts. If callback present it does
1675 * all the work otherwise use generated values from parent ctx.
1677 if (tctx->tlsext_ticket_key_cb) {
1678 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1684 RAND_pseudo_bytes(iv, 16);
1685 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1686 tctx->tlsext_tick_aes_key, iv);
1687 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1688 tlsext_tick_md(), NULL);
1689 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1691 l2n(s->session->tlsext_tick_lifetime_hint, p);
1692 /* Skip ticket length for now */
1694 /* Output key name */
1696 memcpy(p, key_name, 16);
1699 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1700 p += EVP_CIPHER_CTX_iv_length(&ctx);
1701 /* Encrypt session data */
1702 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1704 EVP_EncryptFinal(&ctx, p, &len);
1706 EVP_CIPHER_CTX_cleanup(&ctx);
1708 HMAC_Update(&hctx, macstart, p - macstart);
1709 HMAC_Final(&hctx, p, &hlen);
1710 HMAC_CTX_cleanup(&hctx);
1713 /* Now write out lengths: p points to end of data written */
1715 len = p - (unsigned char *)(s->init_buf->data);
1717 p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1718 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1720 /* number of bytes to write */
1722 s->state = SSL3_ST_SW_SESSION_TICKET_B;
1726 /* XDTLS: set message header ? */
1727 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1728 dtls1_set_message_header(s, (void *)s->init_buf->data,
1729 SSL3_MT_NEWSESSION_TICKET, msg_len, 0,
1732 /* buffer the message to handle re-xmits */
1733 dtls1_buffer_message(s, 0);
1736 /* SSL3_ST_SW_SESSION_TICKET_B */
1737 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));