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) {
229 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
237 if (!ssl3_setup_buffers(s)) {
243 s->d1->change_cipher_spec_ok = 0;
245 * Should have been reset by ssl3_get_finished, too.
247 s->s3->change_cipher_spec = 0;
249 if (s->state != SSL_ST_RENEGOTIATE) {
251 * Ok, we now need to push on a buffering BIO so that the
252 * output is sent in a way that TCP likes :-) ...but not with
255 #ifndef OPENSSL_NO_SCTP
256 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
258 if (!ssl_init_wbio_buffer(s, 1)) {
263 ssl3_init_finished_mac(s);
264 s->state = SSL3_ST_SR_CLNT_HELLO_A;
265 s->ctx->stats.sess_accept++;
268 * s->state == SSL_ST_RENEGOTIATE, we will just send a
271 s->ctx->stats.sess_accept_renegotiate++;
272 s->state = SSL3_ST_SW_HELLO_REQ_A;
277 case SSL3_ST_SW_HELLO_REQ_A:
278 case SSL3_ST_SW_HELLO_REQ_B:
281 dtls1_clear_record_buffer(s);
282 dtls1_start_timer(s);
283 ret = dtls1_send_hello_request(s);
286 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
287 s->state = SSL3_ST_SW_FLUSH;
290 ssl3_init_finished_mac(s);
293 case SSL3_ST_SW_HELLO_REQ_C:
294 s->state = SSL_ST_OK;
297 case SSL3_ST_SR_CLNT_HELLO_A:
298 case SSL3_ST_SR_CLNT_HELLO_B:
299 case SSL3_ST_SR_CLNT_HELLO_C:
302 ret = ssl3_get_client_hello(s);
307 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
308 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
310 s->state = SSL3_ST_SW_SRVR_HELLO_A;
315 * Reflect ClientHello sequence to remain stateless while
319 memcpy(s->s3->write_sequence, s->s3->read_sequence,
320 sizeof(s->s3->write_sequence));
323 /* If we're just listening, stop here */
324 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) {
328 * Set expected sequence numbers to continue the handshake.
330 s->d1->handshake_read_seq = 2;
331 s->d1->handshake_write_seq = 1;
332 s->d1->next_handshake_write_seq = 1;
338 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
339 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
341 ret = dtls1_send_hello_verify_request(s);
344 s->state = SSL3_ST_SW_FLUSH;
345 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
347 /* HelloVerifyRequest resets Finished MAC */
348 if (s->version != DTLS1_BAD_VER)
349 ssl3_init_finished_mac(s);
352 #ifndef OPENSSL_NO_SCTP
353 case DTLS1_SCTP_ST_SR_READ_SOCK:
355 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
356 s->s3->in_read_app_data = 2;
357 s->rwstate = SSL_READING;
358 BIO_clear_retry_flags(SSL_get_rbio(s));
359 BIO_set_retry_read(SSL_get_rbio(s));
364 s->state = SSL3_ST_SR_FINISHED_A;
367 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
368 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
373 if (s->d1->next_state != SSL_ST_OK) {
374 s->s3->in_read_app_data = 2;
375 s->rwstate = SSL_READING;
376 BIO_clear_retry_flags(SSL_get_rbio(s));
377 BIO_set_retry_read(SSL_get_rbio(s));
383 s->state = s->d1->next_state;
387 case SSL3_ST_SW_SRVR_HELLO_A:
388 case SSL3_ST_SW_SRVR_HELLO_B:
390 dtls1_start_timer(s);
391 ret = dtls1_send_server_hello(s);
396 #ifndef OPENSSL_NO_SCTP
398 * Add new shared key for SCTP-Auth, will be ignored if no
401 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
402 DTLS1_SCTP_AUTH_LABEL);
404 SSL_export_keying_material(s, sctpauthkey,
405 sizeof(sctpauthkey), labelbuffer,
406 sizeof(labelbuffer), NULL, 0, 0);
408 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
409 sizeof(sctpauthkey), sctpauthkey);
411 #ifndef OPENSSL_NO_TLSEXT
412 if (s->tlsext_ticket_expected)
413 s->state = SSL3_ST_SW_SESSION_TICKET_A;
415 s->state = SSL3_ST_SW_CHANGE_A;
417 s->state = SSL3_ST_SW_CHANGE_A;
420 s->state = SSL3_ST_SW_CERT_A;
424 case SSL3_ST_SW_CERT_A:
425 case SSL3_ST_SW_CERT_B:
426 /* Check if it is anon DH or normal PSK */
427 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
428 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
429 dtls1_start_timer(s);
430 ret = dtls1_send_server_certificate(s);
433 #ifndef OPENSSL_NO_TLSEXT
434 if (s->tlsext_status_expected)
435 s->state = SSL3_ST_SW_CERT_STATUS_A;
437 s->state = SSL3_ST_SW_KEY_EXCH_A;
440 s->state = SSL3_ST_SW_KEY_EXCH_A;
446 s->state = SSL3_ST_SW_KEY_EXCH_A;
451 case SSL3_ST_SW_KEY_EXCH_A:
452 case SSL3_ST_SW_KEY_EXCH_B:
453 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
456 * clear this, it may get reset by
457 * send_server_key_exchange
459 s->s3->tmp.use_rsa_tmp = 0;
462 * only send if a DH key exchange or RSA but we have a sign only
467 * PSK: send ServerKeyExchange if PSK identity hint if
470 #ifndef OPENSSL_NO_PSK
471 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
473 || (alg_k & (SSL_kEDH | SSL_kDHr | SSL_kDHd))
474 || (alg_k & SSL_kEECDH)
475 || ((alg_k & SSL_kRSA)
476 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
477 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
478 && EVP_PKEY_size(s->cert->pkeys
479 [SSL_PKEY_RSA_ENC].privatekey) *
480 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
485 dtls1_start_timer(s);
486 ret = dtls1_send_server_key_exchange(s);
492 s->state = SSL3_ST_SW_CERT_REQ_A;
496 case SSL3_ST_SW_CERT_REQ_A:
497 case SSL3_ST_SW_CERT_REQ_B:
498 if ( /* don't request cert unless asked for it: */
499 !(s->verify_mode & SSL_VERIFY_PEER) ||
501 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
502 * during re-negotiation:
504 ((s->session->peer != NULL) &&
505 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
507 * never request cert in anonymous ciphersuites (see
508 * section "Certificate request" in SSL 3 drafts and in
511 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
513 * ... except when the application insists on
514 * verification (against the specs, but s3_clnt.c accepts
517 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
519 * never request cert in Kerberos ciphersuites
521 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
523 * With normal PSK Certificates and Certificate Requests
526 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
527 /* no cert request */
529 s->s3->tmp.cert_request = 0;
530 s->state = SSL3_ST_SW_SRVR_DONE_A;
531 #ifndef OPENSSL_NO_SCTP
532 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
533 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
534 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
538 s->s3->tmp.cert_request = 1;
539 dtls1_start_timer(s);
540 ret = dtls1_send_certificate_request(s);
543 #ifndef NETSCAPE_HANG_BUG
544 s->state = SSL3_ST_SW_SRVR_DONE_A;
545 # ifndef OPENSSL_NO_SCTP
546 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
547 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
548 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
552 s->state = SSL3_ST_SW_FLUSH;
553 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
554 # ifndef OPENSSL_NO_SCTP
555 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
556 s->d1->next_state = s->s3->tmp.next_state;
557 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
565 case SSL3_ST_SW_SRVR_DONE_A:
566 case SSL3_ST_SW_SRVR_DONE_B:
567 dtls1_start_timer(s);
568 ret = dtls1_send_server_done(s);
571 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
572 s->state = SSL3_ST_SW_FLUSH;
576 case SSL3_ST_SW_FLUSH:
577 s->rwstate = SSL_WRITING;
578 if (BIO_flush(s->wbio) <= 0) {
580 * If the write error was fatal, stop trying
582 if (!BIO_should_retry(s->wbio)) {
583 s->rwstate = SSL_NOTHING;
584 s->state = s->s3->tmp.next_state;
590 s->rwstate = SSL_NOTHING;
591 s->state = s->s3->tmp.next_state;
594 case SSL3_ST_SR_CERT_A:
595 case SSL3_ST_SR_CERT_B:
596 /* Check for second client hello (MS SGC) */
597 ret = ssl3_check_client_hello(s);
602 s->state = SSL3_ST_SR_CLNT_HELLO_C;
604 if (s->s3->tmp.cert_request) {
605 ret = ssl3_get_client_certificate(s);
610 s->state = SSL3_ST_SR_KEY_EXCH_A;
614 case SSL3_ST_SR_KEY_EXCH_A:
615 case SSL3_ST_SR_KEY_EXCH_B:
616 ret = ssl3_get_client_key_exchange(s);
619 #ifndef OPENSSL_NO_SCTP
621 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
624 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
625 DTLS1_SCTP_AUTH_LABEL);
627 SSL_export_keying_material(s, sctpauthkey,
628 sizeof(sctpauthkey), labelbuffer,
629 sizeof(labelbuffer), NULL, 0, 0);
631 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
632 sizeof(sctpauthkey), sctpauthkey);
635 s->state = SSL3_ST_SR_CERT_VRFY_A;
640 * For the ECDH ciphersuites when the client sends its ECDH
641 * pub key in a certificate, the CertificateVerify message is
644 s->state = SSL3_ST_SR_FINISHED_A;
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:
669 * This *should* be the first time we enable CCS, but be
670 * extra careful about surrounding code changes. We need
671 * to set this here because we don't know if we're
672 * expecting a CertificateVerify or not.
674 if (!s->s3->change_cipher_spec)
675 s->d1->change_cipher_spec_ok = 1;
676 /* we should decide if we expected this one */
677 ret = ssl3_get_cert_verify(s);
680 #ifndef OPENSSL_NO_SCTP
681 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
682 state == SSL_ST_RENEGOTIATE)
683 s->state = DTLS1_SCTP_ST_SR_READ_SOCK;
686 s->state = SSL3_ST_SR_FINISHED_A;
690 case SSL3_ST_SR_FINISHED_A:
691 case SSL3_ST_SR_FINISHED_B:
693 * Enable CCS for resumed handshakes.
694 * In a full handshake, we end up here through
695 * SSL3_ST_SR_CERT_VRFY_B, so change_cipher_spec_ok was
696 * already set. Receiving a CCS clears the flag, so make
697 * sure not to re-enable it to ban duplicates.
698 * s->s3->change_cipher_spec is set when a CCS is
699 * processed in d1_pkt.c, and remains set until
700 * the client's Finished message is read.
702 if (!s->s3->change_cipher_spec)
703 s->d1->change_cipher_spec_ok = 1;
704 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
705 SSL3_ST_SR_FINISHED_B);
710 s->state = SSL_ST_OK;
711 #ifndef OPENSSL_NO_TLSEXT
712 else if (s->tlsext_ticket_expected)
713 s->state = SSL3_ST_SW_SESSION_TICKET_A;
716 s->state = SSL3_ST_SW_CHANGE_A;
720 #ifndef OPENSSL_NO_TLSEXT
721 case SSL3_ST_SW_SESSION_TICKET_A:
722 case SSL3_ST_SW_SESSION_TICKET_B:
723 ret = dtls1_send_newsession_ticket(s);
726 s->state = SSL3_ST_SW_CHANGE_A;
730 case SSL3_ST_SW_CERT_STATUS_A:
731 case SSL3_ST_SW_CERT_STATUS_B:
732 ret = ssl3_send_cert_status(s);
735 s->state = SSL3_ST_SW_KEY_EXCH_A;
741 case SSL3_ST_SW_CHANGE_A:
742 case SSL3_ST_SW_CHANGE_B:
744 s->session->cipher = s->s3->tmp.new_cipher;
745 if (!s->method->ssl3_enc->setup_key_block(s)) {
750 ret = dtls1_send_change_cipher_spec(s,
752 SSL3_ST_SW_CHANGE_B);
757 #ifndef OPENSSL_NO_SCTP
760 * Change to new shared key of SCTP-Auth, will be ignored if
763 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
768 s->state = SSL3_ST_SW_FINISHED_A;
771 if (!s->method->ssl3_enc->change_cipher_state(s,
772 SSL3_CHANGE_CIPHER_SERVER_WRITE))
778 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
781 case SSL3_ST_SW_FINISHED_A:
782 case SSL3_ST_SW_FINISHED_B:
783 ret = dtls1_send_finished(s,
784 SSL3_ST_SW_FINISHED_A,
785 SSL3_ST_SW_FINISHED_B,
787 ssl3_enc->server_finished_label,
789 ssl3_enc->server_finished_label_len);
792 s->state = SSL3_ST_SW_FLUSH;
794 s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A;
796 #ifndef OPENSSL_NO_SCTP
798 * Change to new shared key of SCTP-Auth, will be ignored if
801 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
805 s->s3->tmp.next_state = SSL_ST_OK;
806 #ifndef OPENSSL_NO_SCTP
807 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
808 s->d1->next_state = s->s3->tmp.next_state;
809 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
817 /* clean a few things up */
818 ssl3_cleanup_key_block(s);
821 BUF_MEM_free(s->init_buf);
825 /* remove buffering on output */
826 ssl_free_wbio_buffer(s);
830 if (s->renegotiate == 2) { /* skipped if we just sent a
835 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
837 s->ctx->stats.sess_accept_good++;
839 s->handshake_func = dtls1_accept;
842 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
847 /* done handshaking, next message is client hello */
848 s->d1->handshake_read_seq = 0;
849 /* next message is server hello */
850 s->d1->handshake_write_seq = 0;
851 s->d1->next_handshake_write_seq = 0;
856 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE);
862 if (!s->s3->tmp.reuse_message && !skip) {
864 if ((ret = BIO_flush(s->wbio)) <= 0)
868 if ((cb != NULL) && (s->state != state)) {
869 new_state = s->state;
871 cb(s, SSL_CB_ACCEPT_LOOP, 1);
872 s->state = new_state;
878 /* BIO_flush(s->wbio); */
881 #ifndef OPENSSL_NO_SCTP
883 * Notify SCTP BIO socket to leave handshake mode and prevent stream
884 * identifier other than 0. Will be ignored if no SCTP is used.
886 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
887 s->in_handshake, NULL);
891 cb(s, SSL_CB_ACCEPT_EXIT, ret);
895 int dtls1_send_hello_request(SSL *s)
899 if (s->state == SSL3_ST_SW_HELLO_REQ_A) {
900 p = (unsigned char *)s->init_buf->data;
901 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
903 s->state = SSL3_ST_SW_HELLO_REQ_B;
904 /* number of bytes to write */
905 s->init_num = DTLS1_HM_HEADER_LENGTH;
909 * no need to buffer this message, since there are no retransmit
914 /* SSL3_ST_SW_HELLO_REQ_B */
915 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
918 int dtls1_send_hello_verify_request(SSL *s)
920 unsigned int msg_len;
921 unsigned char *msg, *buf, *p;
923 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) {
924 buf = (unsigned char *)s->init_buf->data;
926 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
927 *(p++) = s->version >> 8;
928 *(p++) = s->version & 0xFF;
930 if (s->ctx->app_gen_cookie_cb == NULL ||
931 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
932 &(s->d1->cookie_len)) == 0) {
933 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,
934 ERR_R_INTERNAL_ERROR);
938 *(p++) = (unsigned char)s->d1->cookie_len;
939 memcpy(p, s->d1->cookie, s->d1->cookie_len);
940 p += s->d1->cookie_len;
943 dtls1_set_message_header(s, buf,
944 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0,
947 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
948 /* number of bytes to write */
949 s->init_num = p - buf;
953 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
954 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
957 int dtls1_send_server_hello(SSL *s)
960 unsigned char *p, *d;
965 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) {
966 buf = (unsigned char *)s->init_buf->data;
967 p = s->s3->server_random;
968 ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE);
969 /* Do the message type and length last */
970 d = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
972 *(p++) = s->version >> 8;
973 *(p++) = s->version & 0xff;
976 memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE);
977 p += SSL3_RANDOM_SIZE;
980 * now in theory we have 3 options to sending back the session id.
981 * If it is a re-use, we send back the old session-id, if it is a new
982 * session, we send back the new session-id or we send back a 0
983 * length session-id if we want it to be single use. Currently I will
984 * not implement the '0' length session-id 12-Jan-98 - I'll now
985 * support the '0' length stuff.
987 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
988 s->session->session_id_length = 0;
990 sl = s->session->session_id_length;
991 if (sl > sizeof s->session->session_id) {
992 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
996 memcpy(p, s->session->session_id, sl);
1000 if (s->s3->tmp.new_cipher == NULL)
1002 i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p);
1005 /* put the compression method */
1006 #ifdef OPENSSL_NO_COMP
1009 if (s->s3->tmp.new_compression == NULL)
1012 *(p++) = s->s3->tmp.new_compression->id;
1015 #ifndef OPENSSL_NO_TLSEXT
1016 if (ssl_prepare_serverhello_tlsext(s) <= 0) {
1017 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT);
1021 ssl_add_serverhello_tlsext(s, p,
1022 buf + SSL3_RT_MAX_PLAIN_LENGTH)) ==
1024 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1033 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
1035 s->state = SSL3_ST_SW_SRVR_HELLO_B;
1036 /* number of bytes to write */
1037 s->init_num = p - buf;
1040 /* buffer the message to handle re-xmits */
1041 dtls1_buffer_message(s, 0);
1044 /* SSL3_ST_SW_SRVR_HELLO_B */
1045 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1048 int dtls1_send_server_done(SSL *s)
1052 if (s->state == SSL3_ST_SW_SRVR_DONE_A) {
1053 p = (unsigned char *)s->init_buf->data;
1056 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
1058 s->state = SSL3_ST_SW_SRVR_DONE_B;
1059 /* number of bytes to write */
1060 s->init_num = DTLS1_HM_HEADER_LENGTH;
1063 /* buffer the message to handle re-xmits */
1064 dtls1_buffer_message(s, 0);
1067 /* SSL3_ST_SW_SRVR_DONE_B */
1068 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1071 int dtls1_send_server_key_exchange(SSL *s)
1073 #ifndef OPENSSL_NO_RSA
1077 unsigned char md_buf[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
1080 #ifndef OPENSSL_NO_DH
1081 DH *dh = NULL, *dhp;
1083 #ifndef OPENSSL_NO_ECDH
1084 EC_KEY *ecdh = NULL, *ecdhp;
1085 unsigned char *encodedPoint = NULL;
1088 BN_CTX *bn_ctx = NULL;
1091 unsigned char *p, *d;
1101 EVP_MD_CTX_init(&md_ctx);
1102 if (s->state == SSL3_ST_SW_KEY_EXCH_A) {
1103 type = s->s3->tmp.new_cipher->algorithm_mkey;
1108 r[0] = r[1] = r[2] = r[3] = NULL;
1110 #ifndef OPENSSL_NO_RSA
1111 if (type & SSL_kRSA) {
1112 rsa = cert->rsa_tmp;
1113 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) {
1114 rsa = s->cert->rsa_tmp_cb(s,
1115 SSL_C_IS_EXPORT(s->s3->
1117 SSL_C_EXPORT_PKEYLENGTH(s->s3->
1120 al = SSL_AD_HANDSHAKE_FAILURE;
1121 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1122 SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1126 cert->rsa_tmp = rsa;
1129 al = SSL_AD_HANDSHAKE_FAILURE;
1130 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1131 SSL_R_MISSING_TMP_RSA_KEY);
1136 s->s3->tmp.use_rsa_tmp = 1;
1139 #ifndef OPENSSL_NO_DH
1140 if (type & SSL_kEDH) {
1142 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1143 dhp = s->cert->dh_tmp_cb(s,
1144 SSL_C_IS_EXPORT(s->s3->
1146 SSL_C_EXPORT_PKEYLENGTH(s->s3->
1149 al = SSL_AD_HANDSHAKE_FAILURE;
1150 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1151 SSL_R_MISSING_TMP_DH_KEY);
1155 if (s->s3->tmp.dh != NULL) {
1157 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1158 ERR_R_INTERNAL_ERROR);
1162 if ((dh = DHparams_dup(dhp)) == NULL) {
1163 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
1168 if ((dhp->pub_key == NULL ||
1169 dhp->priv_key == NULL ||
1170 (s->options & SSL_OP_SINGLE_DH_USE))) {
1171 if (!DH_generate_key(dh)) {
1172 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1177 dh->pub_key = BN_dup(dhp->pub_key);
1178 dh->priv_key = BN_dup(dhp->priv_key);
1179 if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) {
1180 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1190 #ifndef OPENSSL_NO_ECDH
1191 if (type & SSL_kEECDH) {
1192 const EC_GROUP *group;
1194 ecdhp = cert->ecdh_tmp;
1195 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL)) {
1196 ecdhp = s->cert->ecdh_tmp_cb(s,
1197 SSL_C_IS_EXPORT(s->s3->
1199 SSL_C_EXPORT_PKEYLENGTH(s->
1200 s3->tmp.new_cipher));
1202 if (ecdhp == NULL) {
1203 al = SSL_AD_HANDSHAKE_FAILURE;
1204 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1205 SSL_R_MISSING_TMP_ECDH_KEY);
1209 if (s->s3->tmp.ecdh != NULL) {
1210 EC_KEY_free(s->s3->tmp.ecdh);
1211 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1212 ERR_R_INTERNAL_ERROR);
1216 /* Duplicate the ECDH structure. */
1217 if (ecdhp == NULL) {
1218 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1221 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) {
1222 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1226 s->s3->tmp.ecdh = ecdh;
1227 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1228 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1229 (s->options & SSL_OP_SINGLE_ECDH_USE)) {
1230 if (!EC_KEY_generate_key(ecdh)) {
1231 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1237 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1238 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1239 (EC_KEY_get0_private_key(ecdh) == NULL)) {
1240 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1244 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1245 (EC_GROUP_get_degree(group) > 163)) {
1246 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1247 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1252 * XXX: For now, we only support ephemeral ECDH keys over named
1253 * (not generic) curves. For supported named curves, curve_id is
1257 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1259 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1260 SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1265 * Encode the public key. First check the size of encoding and
1266 * allocate memory accordingly.
1268 encodedlen = EC_POINT_point2oct(group,
1269 EC_KEY_get0_public_key(ecdh),
1270 POINT_CONVERSION_UNCOMPRESSED,
1273 encodedPoint = (unsigned char *)
1274 OPENSSL_malloc(encodedlen * sizeof(unsigned char));
1275 bn_ctx = BN_CTX_new();
1276 if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
1277 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1278 ERR_R_MALLOC_FAILURE);
1282 encodedlen = EC_POINT_point2oct(group,
1283 EC_KEY_get0_public_key(ecdh),
1284 POINT_CONVERSION_UNCOMPRESSED,
1285 encodedPoint, encodedlen, bn_ctx);
1287 if (encodedlen == 0) {
1288 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1292 BN_CTX_free(bn_ctx);
1296 * XXX: For now, we only support named (not generic) curves in
1297 * ECDH ephemeral key exchanges. In this situation, we need four
1298 * additional bytes to encode the entire ServerECDHParams
1304 * We'll generate the serverKeyExchange message explicitly so we
1305 * can set these to NULLs
1312 #endif /* !OPENSSL_NO_ECDH */
1313 #ifndef OPENSSL_NO_PSK
1314 if (type & SSL_kPSK) {
1316 * reserve size for record length and PSK identity hint
1318 n += 2 + strlen(s->ctx->psk_identity_hint);
1320 #endif /* !OPENSSL_NO_PSK */
1322 al = SSL_AD_HANDSHAKE_FAILURE;
1323 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1324 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1327 for (i = 0; r[i] != NULL; i++) {
1328 nr[i] = BN_num_bytes(r[i]);
1332 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1333 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
1334 if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, NULL))
1336 al = SSL_AD_DECODE_ERROR;
1339 kn = EVP_PKEY_size(pkey);
1345 if (!BUF_MEM_grow_clean(buf, n + DTLS1_HM_HEADER_LENGTH + kn)) {
1346 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_BUF);
1349 d = (unsigned char *)s->init_buf->data;
1350 p = &(d[DTLS1_HM_HEADER_LENGTH]);
1352 for (i = 0; r[i] != NULL; i++) {
1358 #ifndef OPENSSL_NO_ECDH
1359 if (type & SSL_kEECDH) {
1361 * XXX: For now, we only support named (not generic) curves. In
1362 * this situation, the serverKeyExchange message has: [1 byte
1363 * CurveType], [2 byte CurveName] [1 byte length of encoded
1364 * point], followed by the actual encoded point itself
1366 *p = NAMED_CURVE_TYPE;
1374 memcpy((unsigned char *)p,
1375 (unsigned char *)encodedPoint, encodedlen);
1376 OPENSSL_free(encodedPoint);
1377 encodedPoint = NULL;
1382 #ifndef OPENSSL_NO_PSK
1383 if (type & SSL_kPSK) {
1384 /* copy PSK identity hint */
1385 s2n(strlen(s->ctx->psk_identity_hint), p);
1386 strncpy((char *)p, s->ctx->psk_identity_hint,
1387 strlen(s->ctx->psk_identity_hint));
1388 p += strlen(s->ctx->psk_identity_hint);
1395 * n is the length of the params, they start at
1396 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space at the
1399 #ifndef OPENSSL_NO_RSA
1400 if (pkey->type == EVP_PKEY_RSA) {
1403 for (num = 2; num > 0; num--) {
1404 EVP_DigestInit_ex(&md_ctx, (num == 2)
1405 ? s->ctx->md5 : s->ctx->sha1, NULL);
1406 EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
1408 EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
1410 EVP_DigestUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]),
1412 EVP_DigestFinal_ex(&md_ctx, q, (unsigned int *)&i);
1416 if (RSA_sign(NID_md5_sha1, md_buf, j,
1417 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
1418 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_RSA);
1425 #if !defined(OPENSSL_NO_DSA)
1426 if (pkey->type == EVP_PKEY_DSA) {
1428 EVP_SignInit_ex(&md_ctx, EVP_dss1(), NULL);
1429 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]),
1431 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]),
1433 EVP_SignUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), n);
1434 if (!EVP_SignFinal(&md_ctx, &(p[2]),
1435 (unsigned int *)&i, pkey)) {
1436 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_DSA);
1443 #if !defined(OPENSSL_NO_ECDSA)
1444 if (pkey->type == EVP_PKEY_EC) {
1445 /* let's do ECDSA */
1446 EVP_SignInit_ex(&md_ctx, EVP_ecdsa(), NULL);
1447 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]),
1449 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]),
1451 EVP_SignUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), n);
1452 if (!EVP_SignFinal(&md_ctx, &(p[2]),
1453 (unsigned int *)&i, pkey)) {
1454 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1463 /* Is this error check actually needed? */
1464 al = SSL_AD_HANDSHAKE_FAILURE;
1465 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1466 SSL_R_UNKNOWN_PKEY_TYPE);
1471 d = dtls1_set_message_header(s, d,
1472 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1475 * we should now have things packed up, so lets send it off
1477 s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1480 /* buffer the message to handle re-xmits */
1481 dtls1_buffer_message(s, 0);
1484 s->state = SSL3_ST_SW_KEY_EXCH_B;
1485 EVP_MD_CTX_cleanup(&md_ctx);
1486 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1488 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1490 #ifndef OPENSSL_NO_ECDH
1491 if (encodedPoint != NULL)
1492 OPENSSL_free(encodedPoint);
1493 BN_CTX_free(bn_ctx);
1495 EVP_MD_CTX_cleanup(&md_ctx);
1499 int dtls1_send_certificate_request(SSL *s)
1501 unsigned char *p, *d;
1502 int i, j, nl, off, n;
1503 STACK_OF(X509_NAME) *sk = NULL;
1506 unsigned int msg_len;
1508 if (s->state == SSL3_ST_SW_CERT_REQ_A) {
1511 d = p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1513 /* get the list of acceptable cert types */
1515 n = ssl3_get_req_cert_type(s, p);
1524 sk = SSL_get_client_CA_list(s);
1527 for (i = 0; i < sk_X509_NAME_num(sk); i++) {
1528 name = sk_X509_NAME_value(sk, i);
1529 j = i2d_X509_NAME(name, NULL);
1530 if (!BUF_MEM_grow_clean
1531 (buf, DTLS1_HM_HEADER_LENGTH + n + j + 2)) {
1532 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,
1536 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + n]);
1537 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) {
1539 i2d_X509_NAME(name, &p);
1544 i2d_X509_NAME(name, &p);
1553 /* else no CA names */
1554 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + off]);
1557 d = (unsigned char *)buf->data;
1558 *(d++) = SSL3_MT_CERTIFICATE_REQUEST;
1560 s2n(s->d1->handshake_write_seq, d);
1561 s->d1->handshake_write_seq++;
1564 * we should now have things packed up, so lets send it off
1567 s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1569 #ifdef NETSCAPE_HANG_BUG
1570 /* XXX: what to do about this? */
1571 p = (unsigned char *)s->init_buf->data + s->init_num;
1574 *(p++) = SSL3_MT_SERVER_DONE;
1581 /* XDTLS: set message header ? */
1582 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1583 dtls1_set_message_header(s, (void *)s->init_buf->data,
1584 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0,
1587 /* buffer the message to handle re-xmits */
1588 dtls1_buffer_message(s, 0);
1590 s->state = SSL3_ST_SW_CERT_REQ_B;
1593 /* SSL3_ST_SW_CERT_REQ_B */
1594 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1599 int dtls1_send_server_certificate(SSL *s)
1604 if (s->state == SSL3_ST_SW_CERT_A) {
1605 x = ssl_get_server_send_cert(s);
1607 /* VRS: allow null cert if auth == KRB5 */
1608 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1609 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5)) {
1610 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,
1611 ERR_R_INTERNAL_ERROR);
1616 l = dtls1_output_cert_chain(s, x);
1618 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1621 s->state = SSL3_ST_SW_CERT_B;
1622 s->init_num = (int)l;
1625 /* buffer the message to handle re-xmits */
1626 dtls1_buffer_message(s, 0);
1629 /* SSL3_ST_SW_CERT_B */
1630 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1633 #ifndef OPENSSL_NO_TLSEXT
1634 int dtls1_send_newsession_ticket(SSL *s)
1636 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) {
1637 unsigned char *p, *senc, *macstart;
1639 unsigned int hlen, msg_len;
1642 SSL_CTX *tctx = s->initial_ctx;
1643 unsigned char iv[EVP_MAX_IV_LENGTH];
1644 unsigned char key_name[16];
1646 /* get session encoding length */
1647 slen = i2d_SSL_SESSION(s->session, NULL);
1649 * Some length values are 16 bits, so forget it if session is too
1655 * Grow buffer if need be: the length calculation is as follows 12
1656 * (DTLS handshake message header) + 4 (ticket lifetime hint) + 2
1657 * (ticket length) + 16 (key name) + max_iv_len (iv length) +
1658 * session_length + max_enc_block_size (max encrypted session length)
1659 * + max_md_size (HMAC).
1661 if (!BUF_MEM_grow(s->init_buf,
1662 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1663 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1665 senc = OPENSSL_malloc(slen);
1669 i2d_SSL_SESSION(s->session, &p);
1671 p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1672 EVP_CIPHER_CTX_init(&ctx);
1673 HMAC_CTX_init(&hctx);
1675 * Initialize HMAC and cipher contexts. If callback present it does
1676 * all the work otherwise use generated values from parent ctx.
1678 if (tctx->tlsext_ticket_key_cb) {
1679 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1685 RAND_pseudo_bytes(iv, 16);
1686 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1687 tctx->tlsext_tick_aes_key, iv);
1688 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1689 tlsext_tick_md(), NULL);
1690 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1692 l2n(s->session->tlsext_tick_lifetime_hint, p);
1693 /* Skip ticket length for now */
1695 /* Output key name */
1697 memcpy(p, key_name, 16);
1700 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1701 p += EVP_CIPHER_CTX_iv_length(&ctx);
1702 /* Encrypt session data */
1703 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1705 EVP_EncryptFinal(&ctx, p, &len);
1707 EVP_CIPHER_CTX_cleanup(&ctx);
1709 HMAC_Update(&hctx, macstart, p - macstart);
1710 HMAC_Final(&hctx, p, &hlen);
1711 HMAC_CTX_cleanup(&hctx);
1714 /* Now write out lengths: p points to end of data written */
1716 len = p - (unsigned char *)(s->init_buf->data);
1718 p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1719 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1721 /* number of bytes to write */
1723 s->state = SSL3_ST_SW_SESSION_TICKET_B;
1727 /* XDTLS: set message header ? */
1728 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1729 dtls1_set_message_header(s, (void *)s->init_buf->data,
1730 SSL3_MT_NEWSESSION_TICKET, msg_len, 0,
1733 /* buffer the message to handle re-xmits */
1734 dtls1_buffer_message(s, 0);
1737 /* SSL3_ST_SW_SESSION_TICKET_B */
1738 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));