3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
6 /* ====================================================================
7 * Copyright (c) 1999-2005 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 #ifndef OPENSSL_NO_DH
125 # include <openssl/dh.h>
128 static SSL_METHOD *dtls1_get_server_method(int ver);
129 static int dtls1_send_hello_verify_request(SSL *s);
131 static SSL_METHOD *dtls1_get_server_method(int ver)
133 if (ver == DTLS1_VERSION)
134 return (DTLSv1_server_method());
139 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
141 ssl_undefined_function, dtls1_get_server_method)
143 int dtls1_accept(SSL *s)
146 unsigned long l, Time = (unsigned long)time(NULL);
147 void (*cb) (const SSL *ssl, int type, int val) = NULL;
149 int new_state, state, skip = 0;
152 RAND_add(&Time, sizeof(Time), 0);
156 if (s->info_callback != NULL)
157 cb = s->info_callback;
158 else if (s->ctx->info_callback != NULL)
159 cb = s->ctx->info_callback;
161 listen = s->d1->listen;
163 /* init things to blank */
165 if (!SSL_in_init(s) || SSL_in_before(s))
168 s->d1->listen = listen;
170 if (s->cert == NULL) {
171 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET);
179 case SSL_ST_RENEGOTIATE:
181 /* s->state=SSL_ST_ACCEPT; */
185 case SSL_ST_BEFORE | SSL_ST_ACCEPT:
186 case SSL_ST_OK | SSL_ST_ACCEPT:
190 cb(s, SSL_CB_HANDSHAKE_START, 1);
192 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
193 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
196 s->type = SSL_ST_ACCEPT;
198 if (s->init_buf == NULL) {
199 if ((buf = BUF_MEM_new()) == NULL) {
203 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
210 if (!ssl3_setup_buffers(s)) {
217 if (s->state != SSL_ST_RENEGOTIATE) {
219 * Ok, we now need to push on a buffering BIO so that the
220 * output is sent in a way that TCP likes :-)
222 if (!ssl_init_wbio_buffer(s, 1)) {
227 ssl3_init_finished_mac(s);
228 s->state = SSL3_ST_SR_CLNT_HELLO_A;
229 s->ctx->stats.sess_accept++;
232 * s->state == SSL_ST_RENEGOTIATE, we will just send a
235 s->ctx->stats.sess_accept_renegotiate++;
236 s->state = SSL3_ST_SW_HELLO_REQ_A;
241 case SSL3_ST_SW_HELLO_REQ_A:
242 case SSL3_ST_SW_HELLO_REQ_B:
245 dtls1_clear_sent_buffer(s);
246 dtls1_start_timer(s);
247 ret = dtls1_send_hello_request(s);
250 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
251 s->state = SSL3_ST_SW_FLUSH;
254 ssl3_init_finished_mac(s);
257 case SSL3_ST_SW_HELLO_REQ_C:
258 s->state = SSL_ST_OK;
261 case SSL3_ST_SR_CLNT_HELLO_A:
262 case SSL3_ST_SR_CLNT_HELLO_B:
263 case SSL3_ST_SR_CLNT_HELLO_C:
266 ret = ssl3_get_client_hello(s);
271 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
272 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
274 s->state = SSL3_ST_SW_SRVR_HELLO_A;
279 * Reflect ClientHello sequence to remain stateless while
283 memcpy(s->s3->write_sequence, s->s3->read_sequence,
284 sizeof(s->s3->write_sequence));
287 /* If we're just listening, stop here */
288 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) {
292 * Set expected sequence numbers to continue the handshake.
294 s->d1->handshake_read_seq = 2;
295 s->d1->handshake_write_seq = 1;
296 s->d1->next_handshake_write_seq = 1;
302 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
303 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
305 ret = dtls1_send_hello_verify_request(s);
308 s->state = SSL3_ST_SW_FLUSH;
309 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
311 /* HelloVerifyRequests resets Finished MAC */
312 if (s->client_version != DTLS1_BAD_VER)
313 ssl3_init_finished_mac(s);
316 case SSL3_ST_SW_SRVR_HELLO_A:
317 case SSL3_ST_SW_SRVR_HELLO_B:
319 dtls1_start_timer(s);
320 ret = dtls1_send_server_hello(s);
324 #ifndef OPENSSL_NO_TLSEXT
326 if (s->tlsext_ticket_expected)
327 s->state = SSL3_ST_SW_SESSION_TICKET_A;
329 s->state = SSL3_ST_SW_CHANGE_A;
333 s->state = SSL3_ST_SW_CHANGE_A;
336 s->state = SSL3_ST_SW_CERT_A;
340 case SSL3_ST_SW_CERT_A:
341 case SSL3_ST_SW_CERT_B:
342 /* Check if it is anon DH */
343 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) {
344 dtls1_start_timer(s);
345 ret = dtls1_send_server_certificate(s);
348 #ifndef OPENSSL_NO_TLSEXT
349 if (s->tlsext_status_expected)
350 s->state = SSL3_ST_SW_CERT_STATUS_A;
352 s->state = SSL3_ST_SW_KEY_EXCH_A;
355 s->state = SSL3_ST_SW_KEY_EXCH_A;
361 s->state = SSL3_ST_SW_KEY_EXCH_A;
366 case SSL3_ST_SW_KEY_EXCH_A:
367 case SSL3_ST_SW_KEY_EXCH_B:
368 l = s->s3->tmp.new_cipher->algorithms;
371 * clear this, it may get reset by send_server_key_exchange
373 s->s3->tmp.use_rsa_tmp = 0;
376 * only send if a DH key exchange, fortezza or RSA but we have a
377 * sign only certificate
379 if ((l & (SSL_DH | SSL_kFZA))
381 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
382 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
383 && EVP_PKEY_size(s->cert->pkeys
384 [SSL_PKEY_RSA_ENC].privatekey) *
385 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
390 dtls1_start_timer(s);
391 ret = dtls1_send_server_key_exchange(s);
397 s->state = SSL3_ST_SW_CERT_REQ_A;
401 case SSL3_ST_SW_CERT_REQ_A:
402 case SSL3_ST_SW_CERT_REQ_B:
403 if ( /* don't request cert unless asked for it: */
404 !(s->verify_mode & SSL_VERIFY_PEER) ||
406 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
407 * during re-negotiation:
409 ((s->session->peer != NULL) &&
410 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
412 * never request cert in anonymous ciphersuites (see
413 * section "Certificate request" in SSL 3 drafts and in
416 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
418 * ... except when the application insists on
419 * verification (against the specs, but s3_clnt.c accepts
422 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
424 * never request cert in Kerberos ciphersuites
426 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5)) {
427 /* no cert request */
429 s->s3->tmp.cert_request = 0;
430 s->state = SSL3_ST_SW_SRVR_DONE_A;
432 s->s3->tmp.cert_request = 1;
433 dtls1_start_timer(s);
434 ret = dtls1_send_certificate_request(s);
437 #ifndef NETSCAPE_HANG_BUG
438 s->state = SSL3_ST_SW_SRVR_DONE_A;
440 s->state = SSL3_ST_SW_FLUSH;
441 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
447 case SSL3_ST_SW_SRVR_DONE_A:
448 case SSL3_ST_SW_SRVR_DONE_B:
449 dtls1_start_timer(s);
450 ret = dtls1_send_server_done(s);
453 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
454 s->state = SSL3_ST_SW_FLUSH;
458 case SSL3_ST_SW_FLUSH:
459 s->rwstate = SSL_WRITING;
460 if (BIO_flush(s->wbio) <= 0) {
464 s->rwstate = SSL_NOTHING;
465 s->state = s->s3->tmp.next_state;
468 case SSL3_ST_SR_CERT_A:
469 case SSL3_ST_SR_CERT_B:
470 /* Check for second client hello (MS SGC) */
471 ret = ssl3_check_client_hello(s);
476 s->state = SSL3_ST_SR_CLNT_HELLO_C;
478 if (s->s3->tmp.cert_request) {
479 ret = ssl3_get_client_certificate(s);
484 s->state = SSL3_ST_SR_KEY_EXCH_A;
488 case SSL3_ST_SR_KEY_EXCH_A:
489 case SSL3_ST_SR_KEY_EXCH_B:
490 ret = ssl3_get_client_key_exchange(s);
493 s->state = SSL3_ST_SR_CERT_VRFY_A;
497 * We need to get hashes here so if there is a client cert, it
500 s->method->ssl3_enc->cert_verify_mac(s,
501 &(s->s3->finish_dgst1),
503 tmp.cert_verify_md[0]));
504 s->method->ssl3_enc->cert_verify_mac(s, &(s->s3->finish_dgst2),
507 [MD5_DIGEST_LENGTH]));
511 case SSL3_ST_SR_CERT_VRFY_A:
512 case SSL3_ST_SR_CERT_VRFY_B:
514 s->d1->change_cipher_spec_ok = 1;
515 /* we should decide if we expected this one */
516 ret = ssl3_get_cert_verify(s);
520 s->state = SSL3_ST_SR_FINISHED_A;
524 case SSL3_ST_SR_FINISHED_A:
525 case SSL3_ST_SR_FINISHED_B:
526 s->d1->change_cipher_spec_ok = 1;
527 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
528 SSL3_ST_SR_FINISHED_B);
533 s->state = SSL_ST_OK;
534 #ifndef OPENSSL_NO_TLSEXT
535 else if (s->tlsext_ticket_expected)
536 s->state = SSL3_ST_SW_SESSION_TICKET_A;
539 s->state = SSL3_ST_SW_CHANGE_A;
543 #ifndef OPENSSL_NO_TLSEXT
544 case SSL3_ST_SW_SESSION_TICKET_A:
545 case SSL3_ST_SW_SESSION_TICKET_B:
546 ret = dtls1_send_newsession_ticket(s);
549 s->state = SSL3_ST_SW_CHANGE_A;
553 case SSL3_ST_SW_CERT_STATUS_A:
554 case SSL3_ST_SW_CERT_STATUS_B:
555 ret = ssl3_send_cert_status(s);
558 s->state = SSL3_ST_SW_KEY_EXCH_A;
564 case SSL3_ST_SW_CHANGE_A:
565 case SSL3_ST_SW_CHANGE_B:
567 s->session->cipher = s->s3->tmp.new_cipher;
568 if (!s->method->ssl3_enc->setup_key_block(s)) {
573 ret = dtls1_send_change_cipher_spec(s,
575 SSL3_ST_SW_CHANGE_B);
579 s->state = SSL3_ST_SW_FINISHED_A;
582 if (!s->method->ssl3_enc->change_cipher_state(s,
583 SSL3_CHANGE_CIPHER_SERVER_WRITE))
589 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
592 case SSL3_ST_SW_FINISHED_A:
593 case SSL3_ST_SW_FINISHED_B:
594 ret = dtls1_send_finished(s,
595 SSL3_ST_SW_FINISHED_A,
596 SSL3_ST_SW_FINISHED_B,
598 ssl3_enc->server_finished_label,
600 ssl3_enc->server_finished_label_len);
603 s->state = SSL3_ST_SW_FLUSH;
605 s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A;
607 s->s3->tmp.next_state = SSL_ST_OK;
612 /* clean a few things up */
613 ssl3_cleanup_key_block(s);
616 BUF_MEM_free(s->init_buf);
620 /* remove buffering on output */
621 ssl_free_wbio_buffer(s);
625 if (s->new_session == 2) { /* skipped if we just sent a
628 * actually not necessarily a 'new' session unless
629 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set
634 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
636 s->ctx->stats.sess_accept_good++;
638 s->handshake_func = dtls1_accept;
641 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
646 /* done handshaking, next message is client hello */
647 s->d1->handshake_read_seq = 0;
648 /* next message is server hello */
649 s->d1->handshake_write_seq = 0;
650 s->d1->next_handshake_write_seq = 0;
651 dtls1_clear_received_buffer(s);
656 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE);
662 if (!s->s3->tmp.reuse_message && !skip) {
664 if ((ret = BIO_flush(s->wbio)) <= 0)
668 if ((cb != NULL) && (s->state != state)) {
669 new_state = s->state;
671 cb(s, SSL_CB_ACCEPT_LOOP, 1);
672 s->state = new_state;
678 /* BIO_flush(s->wbio); */
682 cb(s, SSL_CB_ACCEPT_EXIT, ret);
686 int dtls1_send_hello_request(SSL *s)
690 if (s->state == SSL3_ST_SW_HELLO_REQ_A) {
691 p = (unsigned char *)s->init_buf->data;
692 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
694 s->state = SSL3_ST_SW_HELLO_REQ_B;
695 /* number of bytes to write */
696 s->init_num = DTLS1_HM_HEADER_LENGTH;
700 * no need to buffer this message, since there are no retransmit
705 /* SSL3_ST_SW_HELLO_REQ_B */
706 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
709 int dtls1_send_hello_verify_request(SSL *s)
711 unsigned int msg_len;
712 unsigned char *msg, *buf, *p;
714 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) {
715 buf = (unsigned char *)s->init_buf->data;
717 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
718 if (s->client_version == DTLS1_BAD_VER)
719 *(p++) = DTLS1_BAD_VER >> 8, *(p++) = DTLS1_BAD_VER & 0xff;
721 *(p++) = s->version >> 8, *(p++) = s->version & 0xFF;
723 if (s->ctx->app_gen_cookie_cb == NULL ||
724 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
725 &(s->d1->cookie_len)) == 0) {
726 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,
727 ERR_R_INTERNAL_ERROR);
731 *(p++) = (unsigned char)s->d1->cookie_len;
732 memcpy(p, s->d1->cookie, s->d1->cookie_len);
733 p += s->d1->cookie_len;
736 dtls1_set_message_header(s, buf,
737 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0,
740 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
741 /* number of bytes to write */
742 s->init_num = p - buf;
746 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
747 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
750 int dtls1_send_server_hello(SSL *s)
753 unsigned char *p, *d;
756 unsigned long l, Time;
758 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) {
759 buf = (unsigned char *)s->init_buf->data;
760 p = s->s3->server_random;
761 Time = (unsigned long)time(NULL); /* Time */
763 RAND_pseudo_bytes(p, SSL3_RANDOM_SIZE - 4);
764 /* Do the message type and length last */
765 d = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
767 if (s->client_version == DTLS1_BAD_VER)
768 *(p++) = DTLS1_BAD_VER >> 8, *(p++) = DTLS1_BAD_VER & 0xff;
770 *(p++) = s->version >> 8, *(p++) = s->version & 0xff;
773 memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE);
774 p += SSL3_RANDOM_SIZE;
777 * now in theory we have 3 options to sending back the session id.
778 * If it is a re-use, we send back the old session-id, if it is a new
779 * session, we send back the new session-id or we send back a 0
780 * length session-id if we want it to be single use. Currently I will
781 * not implement the '0' length session-id 12-Jan-98 - I'll now
782 * support the '0' length stuff.
784 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
785 s->session->session_id_length = 0;
787 sl = s->session->session_id_length;
788 if (sl > sizeof s->session->session_id) {
789 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
793 memcpy(p, s->session->session_id, sl);
797 if (s->s3->tmp.new_cipher == NULL)
799 i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p);
802 /* put the compression method */
803 #ifdef OPENSSL_NO_COMP
806 if (s->s3->tmp.new_compression == NULL)
809 *(p++) = s->s3->tmp.new_compression->id;
812 #ifndef OPENSSL_NO_TLSEXT
814 ssl_add_serverhello_tlsext(s, p,
815 buf + SSL3_RT_MAX_PLAIN_LENGTH)) ==
817 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
826 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
828 s->state = SSL3_ST_SW_SRVR_HELLO_B;
829 /* number of bytes to write */
830 s->init_num = p - buf;
833 /* buffer the message to handle re-xmits */
834 dtls1_buffer_message(s, 0);
837 /* SSL3_ST_SW_SRVR_HELLO_B */
838 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
841 int dtls1_send_server_done(SSL *s)
845 if (s->state == SSL3_ST_SW_SRVR_DONE_A) {
846 p = (unsigned char *)s->init_buf->data;
849 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
851 s->state = SSL3_ST_SW_SRVR_DONE_B;
852 /* number of bytes to write */
853 s->init_num = DTLS1_HM_HEADER_LENGTH;
856 /* buffer the message to handle re-xmits */
857 dtls1_buffer_message(s, 0);
860 /* SSL3_ST_SW_SRVR_DONE_B */
861 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
864 int dtls1_send_server_key_exchange(SSL *s)
866 #ifndef OPENSSL_NO_RSA
870 unsigned char md_buf[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
873 #ifndef OPENSSL_NO_DH
877 unsigned char *p, *d;
887 EVP_MD_CTX_init(&md_ctx);
888 if (s->state == SSL3_ST_SW_KEY_EXCH_A) {
889 type = s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
894 r[0] = r[1] = r[2] = r[3] = NULL;
896 #ifndef OPENSSL_NO_RSA
897 if (type & SSL_kRSA) {
899 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) {
900 rsa = s->cert->rsa_tmp_cb(s,
901 SSL_C_IS_EXPORT(s->s3->
903 SSL_C_EXPORT_PKEYLENGTH(s->s3->
906 al = SSL_AD_HANDSHAKE_FAILURE;
907 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
908 SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
915 al = SSL_AD_HANDSHAKE_FAILURE;
916 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
917 SSL_R_MISSING_TMP_RSA_KEY);
922 s->s3->tmp.use_rsa_tmp = 1;
925 #ifndef OPENSSL_NO_DH
926 if (type & SSL_kEDH) {
928 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
929 dhp = s->cert->dh_tmp_cb(s,
930 SSL_C_IS_EXPORT(s->s3->
932 SSL_C_EXPORT_PKEYLENGTH(s->s3->
935 al = SSL_AD_HANDSHAKE_FAILURE;
936 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
937 SSL_R_MISSING_TMP_DH_KEY);
941 if (s->s3->tmp.dh != NULL) {
943 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
944 ERR_R_INTERNAL_ERROR);
948 if ((dh = DHparams_dup(dhp)) == NULL) {
949 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
954 if ((dhp->pub_key == NULL ||
955 dhp->priv_key == NULL ||
956 (s->options & SSL_OP_SINGLE_DH_USE))) {
957 if (!DH_generate_key(dh)) {
958 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
963 dh->pub_key = BN_dup(dhp->pub_key);
964 dh->priv_key = BN_dup(dhp->priv_key);
965 if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) {
966 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
977 al = SSL_AD_HANDSHAKE_FAILURE;
978 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
979 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
982 for (i = 0; r[i] != NULL; i++) {
983 nr[i] = BN_num_bytes(r[i]);
987 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) {
988 if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher))
990 al = SSL_AD_DECODE_ERROR;
993 kn = EVP_PKEY_size(pkey);
999 if (!BUF_MEM_grow_clean(buf, n + DTLS1_HM_HEADER_LENGTH + kn)) {
1000 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_BUF);
1003 d = (unsigned char *)s->init_buf->data;
1004 p = &(d[DTLS1_HM_HEADER_LENGTH]);
1006 for (i = 0; r[i] != NULL; i++) {
1015 * n is the length of the params, they start at
1016 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space at the
1019 #ifndef OPENSSL_NO_RSA
1020 if (pkey->type == EVP_PKEY_RSA) {
1023 for (num = 2; num > 0; num--) {
1024 EVP_DigestInit_ex(&md_ctx, (num == 2)
1025 ? s->ctx->md5 : s->ctx->sha1, NULL);
1026 EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
1028 EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
1030 EVP_DigestUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]),
1032 EVP_DigestFinal_ex(&md_ctx, q, (unsigned int *)&i);
1036 if (RSA_sign(NID_md5_sha1, md_buf, j,
1037 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
1038 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_RSA);
1045 #if !defined(OPENSSL_NO_DSA)
1046 if (pkey->type == EVP_PKEY_DSA) {
1048 EVP_SignInit_ex(&md_ctx, EVP_dss1(), NULL);
1049 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]),
1051 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]),
1053 EVP_SignUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), n);
1054 if (!EVP_SignFinal(&md_ctx, &(p[2]),
1055 (unsigned int *)&i, pkey)) {
1056 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_DSA);
1064 /* Is this error check actually needed? */
1065 al = SSL_AD_HANDSHAKE_FAILURE;
1066 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1067 SSL_R_UNKNOWN_PKEY_TYPE);
1072 d = dtls1_set_message_header(s, d,
1073 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1076 * we should now have things packed up, so lets send it off
1078 s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1081 /* buffer the message to handle re-xmits */
1082 dtls1_buffer_message(s, 0);
1085 s->state = SSL3_ST_SW_KEY_EXCH_B;
1086 EVP_MD_CTX_cleanup(&md_ctx);
1087 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1089 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1091 EVP_MD_CTX_cleanup(&md_ctx);
1095 int dtls1_send_certificate_request(SSL *s)
1097 unsigned char *p, *d;
1098 int i, j, nl, off, n;
1099 STACK_OF(X509_NAME) *sk = NULL;
1102 unsigned int msg_len;
1104 if (s->state == SSL3_ST_SW_CERT_REQ_A) {
1107 d = p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1109 /* get the list of acceptable cert types */
1111 n = ssl3_get_req_cert_type(s, p);
1120 sk = SSL_get_client_CA_list(s);
1123 for (i = 0; i < sk_X509_NAME_num(sk); i++) {
1124 name = sk_X509_NAME_value(sk, i);
1125 j = i2d_X509_NAME(name, NULL);
1126 if (!BUF_MEM_grow_clean
1127 (buf, DTLS1_HM_HEADER_LENGTH + n + j + 2)) {
1128 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,
1132 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + n]);
1133 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) {
1135 i2d_X509_NAME(name, &p);
1140 i2d_X509_NAME(name, &p);
1149 /* else no CA names */
1150 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + off]);
1153 d = (unsigned char *)buf->data;
1154 *(d++) = SSL3_MT_CERTIFICATE_REQUEST;
1156 s2n(s->d1->handshake_write_seq, d);
1157 s->d1->handshake_write_seq++;
1160 * we should now have things packed up, so lets send it off
1163 s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1165 #ifdef NETSCAPE_HANG_BUG
1166 /* XXX: what to do about this? */
1167 p = (unsigned char *)s->init_buf->data + s->init_num;
1170 *(p++) = SSL3_MT_SERVER_DONE;
1177 /* XDTLS: set message header ? */
1178 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1179 dtls1_set_message_header(s, (void *)s->init_buf->data,
1180 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0,
1183 /* buffer the message to handle re-xmits */
1184 dtls1_buffer_message(s, 0);
1186 s->state = SSL3_ST_SW_CERT_REQ_B;
1189 /* SSL3_ST_SW_CERT_REQ_B */
1190 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1195 int dtls1_send_server_certificate(SSL *s)
1200 if (s->state == SSL3_ST_SW_CERT_A) {
1201 x = ssl_get_server_send_cert(s);
1203 /* VRS: allow null cert if auth == KRB5 */
1204 (s->s3->tmp.new_cipher->algorithms
1205 & (SSL_MKEY_MASK | SSL_AUTH_MASK))
1206 != (SSL_aKRB5 | SSL_kKRB5)) {
1207 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1211 l = dtls1_output_cert_chain(s, x);
1212 s->state = SSL3_ST_SW_CERT_B;
1213 s->init_num = (int)l;
1216 /* buffer the message to handle re-xmits */
1217 dtls1_buffer_message(s, 0);
1220 /* SSL3_ST_SW_CERT_B */
1221 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1224 #ifndef OPENSSL_NO_TLSEXT
1225 int dtls1_send_newsession_ticket(SSL *s)
1227 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) {
1228 unsigned char *p, *senc, *macstart;
1230 unsigned int hlen, msg_len;
1233 SSL_CTX *tctx = s->initial_ctx;
1234 unsigned char iv[EVP_MAX_IV_LENGTH];
1235 unsigned char key_name[16];
1237 /* get session encoding length */
1238 slen = i2d_SSL_SESSION(s->session, NULL);
1240 * Some length values are 16 bits, so forget it if session is too
1246 * Grow buffer if need be: the length calculation is as follows 12
1247 * (DTLS handshake message header) + 4 (ticket lifetime hint) + 2
1248 * (ticket length) + 16 (key name) + max_iv_len (iv length) +
1249 * session_length + max_enc_block_size (max encrypted session length)
1250 * + max_md_size (HMAC).
1252 if (!BUF_MEM_grow(s->init_buf,
1253 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1254 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1256 senc = OPENSSL_malloc(slen);
1260 i2d_SSL_SESSION(s->session, &p);
1262 p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1263 EVP_CIPHER_CTX_init(&ctx);
1264 HMAC_CTX_init(&hctx);
1266 * Initialize HMAC and cipher contexts. If callback present it does
1267 * all the work otherwise use generated values from parent ctx.
1269 if (tctx->tlsext_ticket_key_cb) {
1270 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1276 RAND_pseudo_bytes(iv, 16);
1277 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1278 tctx->tlsext_tick_aes_key, iv);
1279 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1280 tlsext_tick_md(), NULL);
1281 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1283 l2n(s->session->tlsext_tick_lifetime_hint, p);
1284 /* Skip ticket length for now */
1286 /* Output key name */
1288 memcpy(p, key_name, 16);
1291 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1292 p += EVP_CIPHER_CTX_iv_length(&ctx);
1293 /* Encrypt session data */
1294 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1296 EVP_EncryptFinal(&ctx, p, &len);
1298 EVP_CIPHER_CTX_cleanup(&ctx);
1300 HMAC_Update(&hctx, macstart, p - macstart);
1301 HMAC_Final(&hctx, p, &hlen);
1302 HMAC_CTX_cleanup(&hctx);
1305 /* Now write out lengths: p points to end of data written */
1307 len = p - (unsigned char *)(s->init_buf->data);
1309 p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1310 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1312 /* number of bytes to write */
1314 s->state = SSL3_ST_SW_SESSION_TICKET_B;
1318 /* XDTLS: set message header ? */
1319 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1320 dtls1_set_message_header(s, (void *)s->init_buf->data,
1321 SSL3_MT_NEWSESSION_TICKET, msg_len, 0,
1324 /* buffer the message to handle re-xmits */
1325 dtls1_buffer_message(s, 0);
1328 /* SSL3_ST_SW_SESSION_TICKET_B */
1329 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));