yuzu/externals/libressl/ssl/d1_lib.c

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2020-12-28 19:15:37 +04:00
/* $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);
}