2014-06-20 20:00:00 +01:00
|
|
|
/*
|
|
|
|
* DTLS implementation written by Nagendra Modadugu
|
|
|
|
* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
|
|
|
|
*/
|
|
|
|
/* ====================================================================
|
|
|
|
* Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved.
|
|
|
|
*
|
|
|
|
* Redistribution and use in source and binary forms, with or without
|
|
|
|
* modification, are permitted provided that the following conditions
|
|
|
|
* are met:
|
|
|
|
*
|
|
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
|
|
* notice, this list of conditions and the following disclaimer.
|
|
|
|
*
|
|
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
* notice, this list of conditions and the following disclaimer in
|
|
|
|
* the documentation and/or other materials provided with the
|
|
|
|
* distribution.
|
|
|
|
*
|
|
|
|
* 3. All advertising materials mentioning features or use of this
|
|
|
|
* software must display the following acknowledgment:
|
|
|
|
* "This product includes software developed by the OpenSSL Project
|
|
|
|
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
|
|
|
|
*
|
|
|
|
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
|
|
|
|
* endorse or promote products derived from this software without
|
|
|
|
* prior written permission. For written permission, please contact
|
|
|
|
* openssl-core@OpenSSL.org.
|
|
|
|
*
|
|
|
|
* 5. Products derived from this software may not be called "OpenSSL"
|
|
|
|
* nor may "OpenSSL" appear in their names without prior written
|
|
|
|
* permission of the OpenSSL Project.
|
|
|
|
*
|
|
|
|
* 6. Redistributions of any form whatsoever must retain the following
|
|
|
|
* acknowledgment:
|
|
|
|
* "This product includes software developed by the OpenSSL Project
|
|
|
|
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
|
|
|
|
*
|
|
|
|
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
|
|
|
|
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
|
|
|
|
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
|
|
|
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
* ====================================================================
|
|
|
|
*
|
|
|
|
* This product includes cryptographic software written by Eric Young
|
|
|
|
* (eay@cryptsoft.com). This product includes software written by Tim
|
|
|
|
* Hudson (tjh@cryptsoft.com). */
|
|
|
|
|
|
|
|
#include <openssl/base.h>
|
|
|
|
|
|
|
|
#include <stdio.h>
|
|
|
|
|
|
|
|
#if defined(OPENSSL_WINDOWS)
|
|
|
|
#include <sys/timeb.h>
|
|
|
|
#else
|
|
|
|
#include <sys/socket.h>
|
2014-07-31 23:23:51 +01:00
|
|
|
#include <sys/time.h>
|
2014-06-20 20:00:00 +01:00
|
|
|
#endif
|
|
|
|
|
|
|
|
#include <openssl/err.h>
|
|
|
|
#include <openssl/mem.h>
|
|
|
|
#include <openssl/obj.h>
|
|
|
|
|
|
|
|
#include "ssl_locl.h"
|
|
|
|
|
2014-07-31 23:23:51 +01:00
|
|
|
static void get_current_time(OPENSSL_timeval *t);
|
|
|
|
static OPENSSL_timeval* dtls1_get_timeout(SSL *s, OPENSSL_timeval* timeleft);
|
2014-06-20 20:00:00 +01:00
|
|
|
static void dtls1_set_handshake_header(SSL *s, int type, unsigned long len);
|
2014-10-11 00:23:43 +01:00
|
|
|
static int dtls1_handshake_write(SSL *s, enum should_add_to_finished_hash should_add_to_finished_hash);
|
|
|
|
static void dtls1_add_to_finished_hash(SSL *s);
|
2014-06-20 20:00:00 +01:00
|
|
|
|
2014-12-11 06:20:52 +00:00
|
|
|
const SSL3_ENC_METHOD DTLSv1_enc_data = {
|
2014-06-20 20:00:00 +01:00
|
|
|
tls1_enc,
|
|
|
|
tls1_mac,
|
|
|
|
tls1_setup_key_block,
|
|
|
|
tls1_generate_master_secret,
|
|
|
|
tls1_change_cipher_state,
|
|
|
|
tls1_final_finish_mac,
|
|
|
|
TLS1_FINISH_MAC_LENGTH,
|
|
|
|
tls1_cert_verify_mac,
|
|
|
|
TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
|
|
|
|
TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
|
|
|
|
tls1_alert_code,
|
|
|
|
tls1_export_keying_material,
|
|
|
|
SSL_ENC_FLAG_DTLS|SSL_ENC_FLAG_EXPLICIT_IV,
|
|
|
|
DTLS1_HM_HEADER_LENGTH,
|
|
|
|
dtls1_set_handshake_header,
|
2014-10-11 00:23:43 +01:00
|
|
|
dtls1_handshake_write,
|
|
|
|
dtls1_add_to_finished_hash,
|
2014-06-20 20:00:00 +01:00
|
|
|
};
|
|
|
|
|
2014-12-11 06:20:52 +00:00
|
|
|
const SSL3_ENC_METHOD DTLSv1_2_enc_data = {
|
2014-06-20 20:00:00 +01:00
|
|
|
tls1_enc,
|
|
|
|
tls1_mac,
|
|
|
|
tls1_setup_key_block,
|
|
|
|
tls1_generate_master_secret,
|
|
|
|
tls1_change_cipher_state,
|
|
|
|
tls1_final_finish_mac,
|
|
|
|
TLS1_FINISH_MAC_LENGTH,
|
|
|
|
tls1_cert_verify_mac,
|
|
|
|
TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
|
|
|
|
TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
|
|
|
|
tls1_alert_code,
|
|
|
|
tls1_export_keying_material,
|
|
|
|
SSL_ENC_FLAG_DTLS|SSL_ENC_FLAG_EXPLICIT_IV|SSL_ENC_FLAG_SIGALGS
|
|
|
|
|SSL_ENC_FLAG_SHA256_PRF|SSL_ENC_FLAG_TLS1_2_CIPHERS,
|
|
|
|
DTLS1_HM_HEADER_LENGTH,
|
|
|
|
dtls1_set_handshake_header,
|
2014-10-11 00:23:43 +01:00
|
|
|
dtls1_handshake_write,
|
|
|
|
dtls1_add_to_finished_hash,
|
2014-06-20 20:00:00 +01:00
|
|
|
};
|
|
|
|
|
|
|
|
int dtls1_new(SSL *s)
|
|
|
|
{
|
|
|
|
DTLS1_STATE *d1;
|
|
|
|
|
|
|
|
if (!ssl3_new(s)) return(0);
|
2014-06-27 01:46:27 +01:00
|
|
|
if ((d1=OPENSSL_malloc(sizeof *d1)) == NULL)
|
|
|
|
{
|
|
|
|
ssl3_free(s);
|
|
|
|
return (0);
|
|
|
|
}
|
2014-06-20 20:00:00 +01:00
|
|
|
memset(d1,0, sizeof *d1);
|
|
|
|
|
|
|
|
/* d1->handshake_epoch=0; */
|
|
|
|
|
|
|
|
d1->unprocessed_rcds.q=pqueue_new();
|
|
|
|
d1->processed_rcds.q=pqueue_new();
|
|
|
|
d1->buffered_messages = pqueue_new();
|
|
|
|
d1->sent_messages=pqueue_new();
|
|
|
|
d1->buffered_app_data.q=pqueue_new();
|
|
|
|
|
|
|
|
if ( s->server)
|
|
|
|
{
|
|
|
|
d1->cookie_len = sizeof(s->d1->cookie);
|
|
|
|
}
|
|
|
|
|
|
|
|
if( ! d1->unprocessed_rcds.q || ! d1->processed_rcds.q
|
|
|
|
|| ! d1->buffered_messages || ! d1->sent_messages || ! d1->buffered_app_data.q)
|
|
|
|
{
|
|
|
|
if ( d1->unprocessed_rcds.q) pqueue_free(d1->unprocessed_rcds.q);
|
|
|
|
if ( d1->processed_rcds.q) pqueue_free(d1->processed_rcds.q);
|
|
|
|
if ( d1->buffered_messages) pqueue_free(d1->buffered_messages);
|
|
|
|
if ( d1->sent_messages) pqueue_free(d1->sent_messages);
|
|
|
|
if ( d1->buffered_app_data.q) pqueue_free(d1->buffered_app_data.q);
|
|
|
|
OPENSSL_free(d1);
|
2014-06-27 01:46:27 +01:00
|
|
|
ssl3_free(s);
|
2014-06-20 20:00:00 +01:00
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
s->d1=d1;
|
|
|
|
s->method->ssl_clear(s);
|
|
|
|
return(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void dtls1_clear_queues(SSL *s)
|
|
|
|
{
|
|
|
|
pitem *item = NULL;
|
|
|
|
hm_fragment *frag = NULL;
|
|
|
|
DTLS1_RECORD_DATA *rdata;
|
|
|
|
|
|
|
|
while( (item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL)
|
|
|
|
{
|
|
|
|
rdata = (DTLS1_RECORD_DATA *) item->data;
|
|
|
|
if (rdata->rbuf.buf)
|
|
|
|
{
|
|
|
|
OPENSSL_free(rdata->rbuf.buf);
|
|
|
|
}
|
|
|
|
OPENSSL_free(item->data);
|
|
|
|
pitem_free(item);
|
|
|
|
}
|
|
|
|
|
|
|
|
while( (item = pqueue_pop(s->d1->processed_rcds.q)) != NULL)
|
|
|
|
{
|
|
|
|
rdata = (DTLS1_RECORD_DATA *) item->data;
|
|
|
|
if (rdata->rbuf.buf)
|
|
|
|
{
|
|
|
|
OPENSSL_free(rdata->rbuf.buf);
|
|
|
|
}
|
|
|
|
OPENSSL_free(item->data);
|
|
|
|
pitem_free(item);
|
|
|
|
}
|
|
|
|
|
|
|
|
while( (item = pqueue_pop(s->d1->buffered_messages)) != NULL)
|
|
|
|
{
|
|
|
|
frag = (hm_fragment *)item->data;
|
2014-12-04 21:23:32 +00:00
|
|
|
dtls1_hm_fragment_free(frag);
|
2014-06-20 20:00:00 +01:00
|
|
|
pitem_free(item);
|
|
|
|
}
|
|
|
|
|
|
|
|
while ( (item = pqueue_pop(s->d1->sent_messages)) != NULL)
|
|
|
|
{
|
|
|
|
frag = (hm_fragment *)item->data;
|
2014-12-04 21:23:32 +00:00
|
|
|
dtls1_hm_fragment_free(frag);
|
2014-06-20 20:00:00 +01:00
|
|
|
pitem_free(item);
|
|
|
|
}
|
|
|
|
|
|
|
|
while ( (item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL)
|
|
|
|
{
|
2014-06-20 20:00:00 +01:00
|
|
|
rdata = (DTLS1_RECORD_DATA *) item->data;
|
|
|
|
if (rdata->rbuf.buf)
|
|
|
|
{
|
|
|
|
OPENSSL_free(rdata->rbuf.buf);
|
|
|
|
}
|
|
|
|
OPENSSL_free(item->data);
|
2014-06-20 20:00:00 +01:00
|
|
|
pitem_free(item);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void dtls1_free(SSL *s)
|
|
|
|
{
|
|
|
|
ssl3_free(s);
|
|
|
|
|
|
|
|
dtls1_clear_queues(s);
|
|
|
|
|
|
|
|
pqueue_free(s->d1->unprocessed_rcds.q);
|
|
|
|
pqueue_free(s->d1->processed_rcds.q);
|
|
|
|
pqueue_free(s->d1->buffered_messages);
|
|
|
|
pqueue_free(s->d1->sent_messages);
|
|
|
|
pqueue_free(s->d1->buffered_app_data.q);
|
|
|
|
|
|
|
|
OPENSSL_free(s->d1);
|
|
|
|
s->d1 = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
void dtls1_clear(SSL *s)
|
|
|
|
{
|
|
|
|
pqueue unprocessed_rcds;
|
|
|
|
pqueue processed_rcds;
|
|
|
|
pqueue buffered_messages;
|
|
|
|
pqueue sent_messages;
|
|
|
|
pqueue buffered_app_data;
|
|
|
|
unsigned int mtu;
|
|
|
|
|
|
|
|
if (s->d1)
|
|
|
|
{
|
|
|
|
unprocessed_rcds = s->d1->unprocessed_rcds.q;
|
|
|
|
processed_rcds = s->d1->processed_rcds.q;
|
|
|
|
buffered_messages = s->d1->buffered_messages;
|
|
|
|
sent_messages = s->d1->sent_messages;
|
|
|
|
buffered_app_data = s->d1->buffered_app_data.q;
|
|
|
|
mtu = s->d1->mtu;
|
|
|
|
|
|
|
|
dtls1_clear_queues(s);
|
|
|
|
|
|
|
|
memset(s->d1, 0, sizeof(*(s->d1)));
|
|
|
|
|
|
|
|
if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)
|
|
|
|
{
|
|
|
|
s->d1->mtu = mtu;
|
|
|
|
}
|
|
|
|
|
|
|
|
s->d1->unprocessed_rcds.q = unprocessed_rcds;
|
|
|
|
s->d1->processed_rcds.q = processed_rcds;
|
|
|
|
s->d1->buffered_messages = buffered_messages;
|
|
|
|
s->d1->sent_messages = sent_messages;
|
|
|
|
s->d1->buffered_app_data.q = buffered_app_data;
|
|
|
|
}
|
|
|
|
|
|
|
|
ssl3_clear(s);
|
2014-12-12 20:55:27 +00:00
|
|
|
s->version = DTLS1_2_VERSION;
|
2014-06-20 20:00:00 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
long dtls1_ctrl(SSL *s, int cmd, long larg, void *parg)
|
|
|
|
{
|
|
|
|
int ret=0;
|
|
|
|
|
|
|
|
switch (cmd)
|
|
|
|
{
|
|
|
|
case DTLS_CTRL_GET_TIMEOUT:
|
2014-07-31 23:23:51 +01:00
|
|
|
if (dtls1_get_timeout(s, (OPENSSL_timeval*) parg) != NULL)
|
2014-06-20 20:00:00 +01:00
|
|
|
{
|
|
|
|
ret = 1;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case DTLS_CTRL_HANDLE_TIMEOUT:
|
|
|
|
ret = dtls1_handle_timeout(s);
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
ret = ssl3_ctrl(s, cmd, larg, parg);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return(ret);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* As it's impossible to use stream ciphers in "datagram" mode, this
|
|
|
|
* simple filter is designed to disengage them in DTLS. Unfortunately
|
|
|
|
* there is no universal way to identify stream SSL_CIPHER, so we have
|
|
|
|
* to explicitly list their SSL_* codes. Currently RC4 is the only one
|
|
|
|
* available, but if new ones emerge, they will have to be added...
|
|
|
|
*/
|
|
|
|
const SSL_CIPHER *dtls1_get_cipher(unsigned int u)
|
|
|
|
{
|
|
|
|
const SSL_CIPHER *ciph = ssl3_get_cipher(u);
|
|
|
|
|
|
|
|
if (ciph != NULL)
|
|
|
|
{
|
|
|
|
if (ciph->algorithm_enc == SSL_RC4)
|
|
|
|
return NULL;
|
2014-11-23 07:47:52 +00:00
|
|
|
/* TODO(davidben): EVP_AEAD does not work in DTLS yet. */
|
|
|
|
if (ciph->algorithm2 & SSL_CIPHER_ALGORITHM2_AEAD ||
|
|
|
|
ciph->algorithm2 & SSL_CIPHER_ALGORITHM2_STATEFUL_AEAD)
|
|
|
|
return NULL;
|
2014-06-20 20:00:00 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
return ciph;
|
|
|
|
}
|
|
|
|
|
|
|
|
void dtls1_start_timer(SSL *s)
|
|
|
|
{
|
|
|
|
/* If timer is not set, initialize duration with 1 second */
|
|
|
|
if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0)
|
|
|
|
{
|
|
|
|
s->d1->timeout_duration = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Set timeout to current time */
|
2014-07-31 23:23:51 +01:00
|
|
|
get_current_time(&s->d1->next_timeout);
|
2014-06-20 20:00:00 +01:00
|
|
|
|
|
|
|
/* Add duration to current time */
|
|
|
|
s->d1->next_timeout.tv_sec += s->d1->timeout_duration;
|
2014-07-31 23:23:51 +01:00
|
|
|
BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0, &s->d1->next_timeout);
|
2014-06-20 20:00:00 +01:00
|
|
|
}
|
|
|
|
|
2014-07-31 23:23:51 +01:00
|
|
|
static OPENSSL_timeval* dtls1_get_timeout(SSL *s, OPENSSL_timeval* timeleft)
|
2014-06-20 20:00:00 +01:00
|
|
|
{
|
2014-07-31 23:23:51 +01:00
|
|
|
OPENSSL_timeval timenow;
|
2014-06-20 20:00:00 +01:00
|
|
|
|
|
|
|
/* If no timeout is set, just return NULL */
|
|
|
|
if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0)
|
|
|
|
{
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Get current time */
|
|
|
|
get_current_time(&timenow);
|
|
|
|
|
|
|
|
/* If timer already expired, set remaining time to 0 */
|
|
|
|
if (s->d1->next_timeout.tv_sec < timenow.tv_sec ||
|
|
|
|
(s->d1->next_timeout.tv_sec == timenow.tv_sec &&
|
|
|
|
s->d1->next_timeout.tv_usec <= timenow.tv_usec))
|
|
|
|
{
|
2014-07-31 23:23:51 +01:00
|
|
|
memset(timeleft, 0, sizeof(OPENSSL_timeval));
|
2014-06-20 20:00:00 +01:00
|
|
|
return timeleft;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Calculate time left until timer expires */
|
2014-07-31 23:23:51 +01:00
|
|
|
memcpy(timeleft, &s->d1->next_timeout, sizeof(OPENSSL_timeval));
|
2014-06-20 20:00:00 +01:00
|
|
|
timeleft->tv_sec -= timenow.tv_sec;
|
|
|
|
timeleft->tv_usec -= timenow.tv_usec;
|
|
|
|
if (timeleft->tv_usec < 0)
|
|
|
|
{
|
|
|
|
timeleft->tv_sec--;
|
|
|
|
timeleft->tv_usec += 1000000;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* If remaining time is less than 15 ms, set it to 0
|
|
|
|
* to prevent issues because of small devergences with
|
|
|
|
* socket timeouts.
|
|
|
|
*/
|
|
|
|
if (timeleft->tv_sec == 0 && timeleft->tv_usec < 15000)
|
|
|
|
{
|
2014-07-31 23:23:51 +01:00
|
|
|
memset(timeleft, 0, sizeof(OPENSSL_timeval));
|
2014-06-20 20:00:00 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
return timeleft;
|
|
|
|
}
|
|
|
|
|
|
|
|
int dtls1_is_timer_expired(SSL *s)
|
|
|
|
{
|
2014-07-31 23:23:51 +01:00
|
|
|
OPENSSL_timeval timeleft;
|
2014-06-20 20:00:00 +01:00
|
|
|
|
|
|
|
/* Get time left until timeout, return false if no timer running */
|
|
|
|
if (dtls1_get_timeout(s, &timeleft) == NULL)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Return false if timer is not expired yet */
|
|
|
|
if (timeleft.tv_sec > 0 || timeleft.tv_usec > 0)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Timer expired, so return true */
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
void dtls1_double_timeout(SSL *s)
|
|
|
|
{
|
|
|
|
s->d1->timeout_duration *= 2;
|
|
|
|
if (s->d1->timeout_duration > 60)
|
|
|
|
s->d1->timeout_duration = 60;
|
|
|
|
dtls1_start_timer(s);
|
|
|
|
}
|
|
|
|
|
|
|
|
void dtls1_stop_timer(SSL *s)
|
|
|
|
{
|
|
|
|
/* Reset everything */
|
|
|
|
memset(&(s->d1->timeout), 0, sizeof(struct dtls1_timeout_st));
|
2014-07-31 23:23:51 +01:00
|
|
|
memset(&s->d1->next_timeout, 0, sizeof(OPENSSL_timeval));
|
2014-06-20 20:00:00 +01:00
|
|
|
s->d1->timeout_duration = 1;
|
2014-07-31 23:23:51 +01:00
|
|
|
BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0, &s->d1->next_timeout);
|
2014-06-20 20:00:00 +01:00
|
|
|
/* Clear retransmission buffer */
|
|
|
|
dtls1_clear_record_buffer(s);
|
|
|
|
}
|
|
|
|
|
|
|
|
int dtls1_check_timeout_num(SSL *s)
|
|
|
|
{
|
|
|
|
s->d1->timeout.num_alerts++;
|
|
|
|
|
|
|
|
/* Reduce MTU after 2 unsuccessful retransmissions */
|
|
|
|
if (s->d1->timeout.num_alerts > 2)
|
|
|
|
{
|
|
|
|
s->d1->mtu = BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (s->d1->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT)
|
|
|
|
{
|
|
|
|
/* fail the connection, enough alerts have been sent */
|
|
|
|
OPENSSL_PUT_ERROR(SSL, dtls1_check_timeout_num, SSL_R_READ_TIMEOUT_EXPIRED);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int dtls1_handle_timeout(SSL *s)
|
|
|
|
{
|
|
|
|
/* if no timer is expired, don't do anything */
|
|
|
|
if (!dtls1_is_timer_expired(s))
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
dtls1_double_timeout(s);
|
|
|
|
|
|
|
|
if (dtls1_check_timeout_num(s) < 0)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
s->d1->timeout.read_timeouts++;
|
|
|
|
if (s->d1->timeout.read_timeouts > DTLS1_TMO_READ_COUNT)
|
|
|
|
{
|
|
|
|
s->d1->timeout.read_timeouts = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
dtls1_start_timer(s);
|
|
|
|
return dtls1_retransmit_buffered_messages(s);
|
|
|
|
}
|
|
|
|
|
2014-07-31 23:23:51 +01:00
|
|
|
static void get_current_time(OPENSSL_timeval *t)
|
2014-06-20 20:00:00 +01:00
|
|
|
{
|
2014-07-31 23:23:51 +01:00
|
|
|
#if defined(OPENSSL_WINDOWS)
|
|
|
|
struct _timeb time;
|
|
|
|
_ftime(&time);
|
|
|
|
t->tv_sec = time.time;
|
|
|
|
t->tv_usec = time.millitm * 1000;
|
2014-06-20 20:00:00 +01:00
|
|
|
#else
|
|
|
|
gettimeofday(t, NULL);
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
static void dtls1_set_handshake_header(SSL *s, int htype, unsigned long len)
|
|
|
|
{
|
|
|
|
unsigned char *p = (unsigned char *)s->init_buf->data;
|
|
|
|
dtls1_set_message_header(s, p, htype, len, 0, len);
|
|
|
|
s->init_num = (int)len + DTLS1_HM_HEADER_LENGTH;
|
|
|
|
s->init_off = 0;
|
|
|
|
/* Buffer the message to handle re-xmits */
|
|
|
|
dtls1_buffer_message(s, 0);
|
|
|
|
}
|
|
|
|
|
2014-10-11 00:23:43 +01:00
|
|
|
static int dtls1_handshake_write(SSL *s, enum should_add_to_finished_hash should_add_to_finished_hash)
|
2014-06-20 20:00:00 +01:00
|
|
|
{
|
2014-10-11 00:23:43 +01:00
|
|
|
return dtls1_do_write(s, SSL3_RT_HANDSHAKE, should_add_to_finished_hash);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void dtls1_add_to_finished_hash(SSL *s)
|
|
|
|
{
|
|
|
|
uint8_t *record = (uint8_t *) &s->init_buf->data[s->init_off];
|
|
|
|
const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
|
|
|
|
uint8_t serialised_header[DTLS1_HM_HEADER_LENGTH];
|
|
|
|
uint8_t *p = serialised_header;
|
|
|
|
|
|
|
|
/* Construct the message header as if it were a single fragment. */
|
|
|
|
*p++ = msg_hdr->type;
|
|
|
|
l2n3(msg_hdr->msg_len, p);
|
|
|
|
s2n (msg_hdr->seq, p);
|
|
|
|
l2n3(0, p);
|
|
|
|
l2n3(msg_hdr->msg_len, p);
|
|
|
|
ssl3_finish_mac(s, serialised_header, sizeof(serialised_header));
|
|
|
|
ssl3_finish_mac(s, record + DTLS1_HM_HEADER_LENGTH,
|
|
|
|
s->init_num - DTLS1_HM_HEADER_LENGTH);
|
2014-06-20 20:00:00 +01:00
|
|
|
}
|