mirror of
https://github.com/pineappleEA/pineapple-src.git
synced 2024-12-05 14:38:26 -05:00
451 lines
11 KiB
C
Executable File
451 lines
11 KiB
C
Executable File
/* $OpenBSD: d1_lib.c,v 1.50 2020/09/26 14:43:17 jsing Exp $ */
|
|
/*
|
|
* 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 <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/time.h>
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <openssl/objects.h>
|
|
|
|
#include "pqueue.h"
|
|
#include "ssl_locl.h"
|
|
|
|
void dtls1_hm_fragment_free(hm_fragment *frag);
|
|
|
|
static int dtls1_listen(SSL *s, struct sockaddr *client);
|
|
|
|
SSL3_ENC_METHOD DTLSv1_enc_data = {
|
|
.enc_flags = SSL_ENC_FLAG_EXPLICIT_IV,
|
|
};
|
|
|
|
int
|
|
dtls1_new(SSL *s)
|
|
{
|
|
if (!ssl3_new(s))
|
|
goto err;
|
|
|
|
if ((s->d1 = calloc(1, sizeof(*s->d1))) == NULL)
|
|
goto err;
|
|
if ((s->d1->internal = calloc(1, sizeof(*s->d1->internal))) == NULL)
|
|
goto err;
|
|
|
|
if ((s->d1->internal->unprocessed_rcds.q = pqueue_new()) == NULL)
|
|
goto err;
|
|
if ((s->d1->internal->processed_rcds.q = pqueue_new()) == NULL)
|
|
goto err;
|
|
if ((s->d1->internal->buffered_messages = pqueue_new()) == NULL)
|
|
goto err;
|
|
if ((s->d1->sent_messages = pqueue_new()) == NULL)
|
|
goto err;
|
|
if ((s->d1->internal->buffered_app_data.q = pqueue_new()) == NULL)
|
|
goto err;
|
|
|
|
if (s->server)
|
|
s->d1->internal->cookie_len = sizeof(D1I(s)->cookie);
|
|
|
|
s->method->internal->ssl_clear(s);
|
|
return (1);
|
|
|
|
err:
|
|
dtls1_free(s);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
dtls1_drain_records(pqueue queue)
|
|
{
|
|
pitem *item;
|
|
DTLS1_RECORD_DATA_INTERNAL *rdata;
|
|
|
|
if (queue == NULL)
|
|
return;
|
|
|
|
while ((item = pqueue_pop(queue)) != NULL) {
|
|
rdata = (DTLS1_RECORD_DATA_INTERNAL *)item->data;
|
|
ssl3_release_buffer(&rdata->rbuf);
|
|
free(item->data);
|
|
pitem_free(item);
|
|
}
|
|
}
|
|
|
|
static void
|
|
dtls1_drain_fragments(pqueue queue)
|
|
{
|
|
pitem *item;
|
|
|
|
if (queue == NULL)
|
|
return;
|
|
|
|
while ((item = pqueue_pop(queue)) != NULL) {
|
|
dtls1_hm_fragment_free(item->data);
|
|
pitem_free(item);
|
|
}
|
|
}
|
|
|
|
static void
|
|
dtls1_clear_queues(SSL *s)
|
|
{
|
|
dtls1_drain_records(D1I(s)->unprocessed_rcds.q);
|
|
dtls1_drain_records(D1I(s)->processed_rcds.q);
|
|
dtls1_drain_fragments(D1I(s)->buffered_messages);
|
|
dtls1_drain_fragments(s->d1->sent_messages);
|
|
dtls1_drain_records(D1I(s)->buffered_app_data.q);
|
|
}
|
|
|
|
void
|
|
dtls1_free(SSL *s)
|
|
{
|
|
if (s == NULL)
|
|
return;
|
|
|
|
ssl3_free(s);
|
|
|
|
dtls1_clear_queues(s);
|
|
|
|
pqueue_free(D1I(s)->unprocessed_rcds.q);
|
|
pqueue_free(D1I(s)->processed_rcds.q);
|
|
pqueue_free(D1I(s)->buffered_messages);
|
|
pqueue_free(s->d1->sent_messages);
|
|
pqueue_free(D1I(s)->buffered_app_data.q);
|
|
|
|
freezero(s->d1->internal, sizeof(*s->d1->internal));
|
|
freezero(s->d1, sizeof(*s->d1));
|
|
|
|
s->d1 = NULL;
|
|
}
|
|
|
|
void
|
|
dtls1_clear(SSL *s)
|
|
{
|
|
struct dtls1_state_internal_st *internal;
|
|
pqueue unprocessed_rcds;
|
|
pqueue processed_rcds;
|
|
pqueue buffered_messages;
|
|
pqueue sent_messages;
|
|
pqueue buffered_app_data;
|
|
unsigned int mtu;
|
|
|
|
if (s->d1) {
|
|
unprocessed_rcds = D1I(s)->unprocessed_rcds.q;
|
|
processed_rcds = D1I(s)->processed_rcds.q;
|
|
buffered_messages = D1I(s)->buffered_messages;
|
|
sent_messages = s->d1->sent_messages;
|
|
buffered_app_data = D1I(s)->buffered_app_data.q;
|
|
mtu = D1I(s)->mtu;
|
|
|
|
dtls1_clear_queues(s);
|
|
|
|
memset(s->d1->internal, 0, sizeof(*s->d1->internal));
|
|
internal = s->d1->internal;
|
|
memset(s->d1, 0, sizeof(*s->d1));
|
|
s->d1->internal = internal;
|
|
|
|
if (s->server) {
|
|
D1I(s)->cookie_len = sizeof(D1I(s)->cookie);
|
|
}
|
|
|
|
if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU) {
|
|
D1I(s)->mtu = mtu;
|
|
}
|
|
|
|
D1I(s)->unprocessed_rcds.q = unprocessed_rcds;
|
|
D1I(s)->processed_rcds.q = processed_rcds;
|
|
D1I(s)->buffered_messages = buffered_messages;
|
|
s->d1->sent_messages = sent_messages;
|
|
D1I(s)->buffered_app_data.q = buffered_app_data;
|
|
}
|
|
|
|
ssl3_clear(s);
|
|
|
|
s->version = DTLS1_VERSION;
|
|
}
|
|
|
|
long
|
|
dtls1_ctrl(SSL *s, int cmd, long larg, void *parg)
|
|
{
|
|
int ret = 0;
|
|
|
|
switch (cmd) {
|
|
case DTLS_CTRL_GET_TIMEOUT:
|
|
if (dtls1_get_timeout(s, (struct timeval*) parg) != NULL) {
|
|
ret = 1;
|
|
}
|
|
break;
|
|
case DTLS_CTRL_HANDLE_TIMEOUT:
|
|
ret = dtls1_handle_timeout(s);
|
|
break;
|
|
case DTLS_CTRL_LISTEN:
|
|
ret = dtls1_listen(s, parg);
|
|
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;
|
|
}
|
|
|
|
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 */
|
|
gettimeofday(&(s->d1->next_timeout), NULL);
|
|
|
|
/* Add duration to current time */
|
|
s->d1->next_timeout.tv_sec += s->d1->timeout_duration;
|
|
BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
|
|
&s->d1->next_timeout);
|
|
}
|
|
|
|
struct timeval*
|
|
dtls1_get_timeout(SSL *s, struct timeval* timeleft)
|
|
{
|
|
struct timeval timenow;
|
|
|
|
/* 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 */
|
|
gettimeofday(&timenow, NULL);
|
|
|
|
/* 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)) {
|
|
memset(timeleft, 0, sizeof(struct timeval));
|
|
return timeleft;
|
|
}
|
|
|
|
/* Calculate time left until timer expires */
|
|
memcpy(timeleft, &(s->d1->next_timeout), sizeof(struct timeval));
|
|
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) {
|
|
memset(timeleft, 0, sizeof(struct timeval));
|
|
}
|
|
|
|
|
|
return timeleft;
|
|
}
|
|
|
|
int
|
|
dtls1_is_timer_expired(SSL *s)
|
|
{
|
|
struct timeval timeleft;
|
|
|
|
/* 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(&(D1I(s)->timeout), 0, sizeof(struct dtls1_timeout_st));
|
|
memset(&(s->d1->next_timeout), 0, sizeof(struct timeval));
|
|
s->d1->timeout_duration = 1;
|
|
BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
|
|
&(s->d1->next_timeout));
|
|
/* Clear retransmission buffer */
|
|
dtls1_clear_record_buffer(s);
|
|
}
|
|
|
|
int
|
|
dtls1_check_timeout_num(SSL *s)
|
|
{
|
|
D1I(s)->timeout.num_alerts++;
|
|
|
|
/* Reduce MTU after 2 unsuccessful retransmissions */
|
|
if (D1I(s)->timeout.num_alerts > 2) {
|
|
D1I(s)->mtu = BIO_ctrl(SSL_get_wbio(s),
|
|
BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, NULL);
|
|
|
|
}
|
|
|
|
if (D1I(s)->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) {
|
|
/* fail the connection, enough alerts have been sent */
|
|
SSLerror(s, 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;
|
|
|
|
D1I(s)->timeout.read_timeouts++;
|
|
if (D1I(s)->timeout.read_timeouts > DTLS1_TMO_READ_COUNT) {
|
|
D1I(s)->timeout.read_timeouts = 1;
|
|
}
|
|
|
|
dtls1_start_timer(s);
|
|
return dtls1_retransmit_buffered_messages(s);
|
|
}
|
|
|
|
int
|
|
dtls1_listen(SSL *s, struct sockaddr *client)
|
|
{
|
|
int ret;
|
|
|
|
/* Ensure there is no state left over from a previous invocation */
|
|
SSL_clear(s);
|
|
|
|
SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
|
|
D1I(s)->listen = 1;
|
|
|
|
ret = SSL_accept(s);
|
|
if (ret <= 0)
|
|
return ret;
|
|
|
|
(void)BIO_dgram_get_peer(SSL_get_rbio(s), client);
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
dtls1_build_sequence_number(unsigned char *dst, unsigned char *seq,
|
|
unsigned short epoch)
|
|
{
|
|
CBB cbb;
|
|
|
|
if (!CBB_init_fixed(&cbb, dst, SSL3_SEQUENCE_SIZE))
|
|
goto err;
|
|
if (!CBB_add_u16(&cbb, epoch))
|
|
goto err;
|
|
if (!CBB_add_bytes(&cbb, &seq[2], SSL3_SEQUENCE_SIZE - 2))
|
|
goto err;
|
|
if (!CBB_finish(&cbb, NULL, NULL))
|
|
goto err;
|
|
|
|
return;
|
|
|
|
err:
|
|
CBB_cleanup(&cbb);
|
|
}
|