-/* ssl/d1_lib.c */
-/*
- * 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).
+/*
+ * Copyright 2005-2017 The OpenSSL Project Authors. All Rights Reserved.
*
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
+#include "e_os.h"
#include <stdio.h>
-#define USE_SOCKETS
#include <openssl/objects.h>
+#include <openssl/rand.h>
#include "ssl_locl.h"
-#if defined(OPENSSL_SYS_VMS)
-#include <sys/timeb.h>
-#endif
-
static void get_current_time(struct timeval *t);
-static void dtls1_set_handshake_header(SSL *s, int type, unsigned long len);
static int dtls1_handshake_write(SSL *s);
-const char dtls1_version_str[]="DTLSv1" OPENSSL_VERSION_PTEXT;
-int dtls1_listen(SSL *s, struct sockaddr *client);
-
-const SSL3_ENC_METHOD DTLSv1_enc_data={
- 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,
- dtls1_handshake_write
- };
-
-const SSL3_ENC_METHOD DTLSv1_2_enc_data={
- 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,
- dtls1_handshake_write
- };
+static size_t dtls1_link_min_mtu(void);
+
+/* XDTLS: figure out the right values */
+static const size_t g_probable_mtu[] = { 1500, 512, 256 };
+
+const SSL3_ENC_METHOD DTLSv1_enc_data = {
+ tls1_enc,
+ tls1_mac,
+ tls1_setup_key_block,
+ tls1_generate_master_secret,
+ tls1_change_cipher_state,
+ tls1_final_finish_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_set_handshake_header,
+ dtls1_close_construct_packet,
+ dtls1_handshake_write
+};
+
+const SSL3_ENC_METHOD DTLSv1_2_enc_data = {
+ tls1_enc,
+ tls1_mac,
+ tls1_setup_key_block,
+ tls1_generate_master_secret,
+ tls1_change_cipher_state,
+ tls1_final_finish_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_set_handshake_header,
+ dtls1_close_construct_packet,
+ dtls1_handshake_write
+};
long dtls1_default_timeout(void)
- {
- /* 2 hours, the 24 hours mentioned in the DTLSv1 spec
- * is way too long for http, the cache would over fill */
- return(60*60*2);
- }
+{
+ /*
+ * 2 hours, the 24 hours mentioned in the DTLSv1 spec is way too long for
+ * http, the cache would over fill
+ */
+ return (60 * 60 * 2);
+}
int dtls1_new(SSL *s)
- {
- DTLS1_STATE *d1;
-
- if (!ssl3_new(s)) return(0);
- if ((d1=OPENSSL_malloc(sizeof *d1)) == NULL) return (0);
- 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);
- return (0);
- }
-
- s->d1=d1;
- s->method->ssl_clear(s);
- return(1);
- }
+{
+ DTLS1_STATE *d1;
+
+ if (!DTLS_RECORD_LAYER_new(&s->rlayer)) {
+ return 0;
+ }
+
+ if (!ssl3_new(s))
+ return 0;
+ if ((d1 = OPENSSL_zalloc(sizeof(*d1))) == NULL) {
+ ssl3_free(s);
+ return 0;
+ }
+
+ d1->buffered_messages = pqueue_new();
+ d1->sent_messages = pqueue_new();
+
+ if (s->server) {
+ d1->cookie_len = sizeof(s->d1->cookie);
+ }
+
+ d1->link_mtu = 0;
+ d1->mtu = 0;
+
+ if (d1->buffered_messages == NULL || d1->sent_messages == NULL) {
+ pqueue_free(d1->buffered_messages);
+ pqueue_free(d1->sent_messages);
+ OPENSSL_free(d1);
+ ssl3_free(s);
+ return 0;
+ }
+
+ s->d1 = d1;
+
+ if (!s->method->ssl_clear(s))
+ return 0;
+
+ return 1;
+}
static void dtls1_clear_queues(SSL *s)
- {
+{
+ dtls1_clear_received_buffer(s);
+ dtls1_clear_sent_buffer(s);
+}
+
+void dtls1_clear_received_buffer(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)
- {
+ while ((item = pqueue_pop(s->d1->buffered_messages)) != NULL) {
frag = (hm_fragment *)item->data;
dtls1_hm_fragment_free(frag);
pitem_free(item);
- }
+ }
+}
+
+void dtls1_clear_sent_buffer(SSL *s)
+{
+ pitem *item = NULL;
+ hm_fragment *frag = NULL;
- while ( (item = pqueue_pop(s->d1->sent_messages)) != NULL)
- {
+ while ((item = pqueue_pop(s->d1->sent_messages)) != NULL) {
frag = (hm_fragment *)item->data;
dtls1_hm_fragment_free(frag);
pitem_free(item);
- }
+ }
+}
- while ( (item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL)
- {
- rdata = (DTLS1_RECORD_DATA *) item->data;
- if (rdata->rbuf.buf)
- {
- OPENSSL_free(rdata->rbuf.buf);
- }
- OPENSSL_free(item->data);
- pitem_free(item);
- }
- }
void dtls1_free(SSL *s)
- {
- ssl3_free(s);
+{
+ DTLS_RECORD_LAYER_free(&s->rlayer);
- dtls1_clear_queues(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 (s->server)
- {
- s->d1->cookie_len = sizeof(s->d1->cookie);
- }
-
- 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);
- if (s->options & SSL_OP_CISCO_ANYCONNECT)
- s->version=DTLS1_BAD_VER;
- else if (s->method->version == DTLS_ANY_VERSION)
- s->version=DTLS1_2_VERSION;
- else
- s->version=s->method->version;
- }
+ pqueue_free(s->d1->sent_messages);
-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;
- case SSL_CTRL_CHECK_PROTO_VERSION:
- /* For library-internal use; checks that the current protocol
- * is the highest enabled version (according to s->ctx->method,
- * as version negotiation may have changed s->method). */
- if (s->version == s->ctx->method->version)
- return 1;
- /* Apparently we're using a version-flexible SSL_METHOD
- * (not at its highest protocol version). */
- if (s->ctx->method->version == DTLS_method()->version)
- {
-#if DTLS_MAX_VERSION != DTLS1_2_VERSION
-# error Code needs update for DTLS_method() support beyond DTLS1_2_VERSION.
+ OPENSSL_free(s->d1);
+ s->d1 = NULL;
+}
+
+int dtls1_clear(SSL *s)
+{
+ pqueue *buffered_messages;
+ pqueue *sent_messages;
+ size_t mtu;
+ size_t link_mtu;
+
+ DTLS_RECORD_LAYER_clear(&s->rlayer);
+
+ if (s->d1) {
+ DTLS_timer_cb timer_cb = s->d1->timer_cb;
+
+ buffered_messages = s->d1->buffered_messages;
+ sent_messages = s->d1->sent_messages;
+ mtu = s->d1->mtu;
+ link_mtu = s->d1->link_mtu;
+
+ dtls1_clear_queues(s);
+
+ memset(s->d1, 0, sizeof(*s->d1));
+
+ /* Restore the timer callback from previous state */
+ s->d1->timer_cb = timer_cb;
+
+ if (s->server) {
+ s->d1->cookie_len = sizeof(s->d1->cookie);
+ }
+
+ if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU) {
+ s->d1->mtu = mtu;
+ s->d1->link_mtu = link_mtu;
+ }
+
+ s->d1->buffered_messages = buffered_messages;
+ s->d1->sent_messages = sent_messages;
+ }
+
+ if (!ssl3_clear(s))
+ return 0;
+
+ if (s->method->version == DTLS_ANY_VERSION)
+ s->version = DTLS_MAX_VERSION;
+#ifndef OPENSSL_NO_DTLS1_METHOD
+ else if (s->options & SSL_OP_CISCO_ANYCONNECT)
+ s->client_version = s->version = DTLS1_BAD_VER;
#endif
- if (!(s->options & SSL_OP_NO_DTLSv1_2))
- return s->version == DTLS1_2_VERSION;
- if (!(s->options & SSL_OP_NO_DTLSv1))
- return s->version == DTLS1_VERSION;
- }
- return 0; /* Unexpected state; fail closed. */
-
- default:
- ret = ssl3_ctrl(s, cmd, larg, parg);
- break;
- }
- return(ret);
- }
+ else
+ s->version = s->method->version;
-/*
- * 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);
+ return 1;
+}
- if (ciph != NULL)
- {
- if (ciph->algorithm_enc == SSL_RC4)
- return NULL;
- }
+long dtls1_ctrl(SSL *s, int cmd, long larg, void *parg)
+{
+ int ret = 0;
- return ciph;
- }
+ 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_SET_LINK_MTU:
+ if (larg < (long)dtls1_link_min_mtu())
+ return 0;
+ s->d1->link_mtu = larg;
+ return 1;
+ case DTLS_CTRL_GET_LINK_MIN_MTU:
+ return (long)dtls1_link_min_mtu();
+ case SSL_CTRL_SET_MTU:
+ /*
+ * We may not have a BIO set yet so can't call dtls1_min_mtu()
+ * We'll have to make do with dtls1_link_min_mtu() and max overhead
+ */
+ if (larg < (long)dtls1_link_min_mtu() - DTLS1_MAX_MTU_OVERHEAD)
+ return 0;
+ s->d1->mtu = larg;
+ return larg;
+ default:
+ ret = ssl3_ctrl(s, cmd, larg, parg);
+ break;
+ }
+ return ret;
+}
void dtls1_start_timer(SSL *s)
- {
+{
+ unsigned int sec, usec;
+
#ifndef OPENSSL_NO_SCTP
- /* Disable timer for SCTP */
- if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
- {
- memset(&(s->d1->next_timeout), 0, sizeof(struct timeval));
- return;
- }
+ /* Disable timer for SCTP */
+ if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
+ memset(&s->d1->next_timeout, 0, sizeof(s->d1->next_timeout));
+ return;
+ }
#endif
- /* 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 */
- get_current_time(&(s->d1->next_timeout));
-
- /* 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 */
- 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))
- {
- 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;
- }
+ /*
+ * If timer is not set, initialize duration with 1 second or
+ * a user-specified value if the timer callback is installed.
+ */
+ if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) {
+
+ if (s->d1->timer_cb != NULL)
+ s->d1->timeout_duration_us = s->d1->timer_cb(s, 0);
+ else
+ s->d1->timeout_duration_us = 1000000;
+ }
+
+ /* Set timeout to current time */
+ get_current_time(&(s->d1->next_timeout));
+
+ /* Add duration to current time */
+
+ sec = s->d1->timeout_duration_us / 1000000;
+ usec = s->d1->timeout_duration_us - (sec * 1000000);
+
+ s->d1->next_timeout.tv_sec += sec;
+ s->d1->next_timeout.tv_usec += usec;
+
+ if (s->d1->next_timeout.tv_usec >= 1000000) {
+ s->d1->next_timeout.tv_sec++;
+ s->d1->next_timeout.tv_usec -= 1000000;
+ }
+
+ 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 */
+ 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)) {
+ memset(timeleft, 0, sizeof(*timeleft));
+ 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 divergences with socket timeouts.
+ */
+ if (timeleft->tv_sec == 0 && timeleft->tv_usec < 15000) {
+ memset(timeleft, 0, sizeof(*timeleft));
+ }
+
+ return timeleft;
+}
int dtls1_is_timer_expired(SSL *s)
- {
- struct timeval timeleft;
+{
+ struct timeval timeleft;
- /* Get time left until timeout, return false if no timer running */
- if (dtls1_get_timeout(s, &timeleft) == NULL)
- {
- return 0;
- }
+ /* 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;
- }
+ /* 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;
- }
+ /* 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);
- }
+{
+ s->d1->timeout_duration_us *= 2;
+ if (s->d1->timeout_duration_us > 60000000)
+ s->d1->timeout_duration_us = 60000000;
+ dtls1_start_timer(s);
+}
void dtls1_stop_timer(SSL *s)
- {
- /* Reset everything */
- memset(&(s->d1->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);
- }
+{
+ /* Reset everything */
+ memset(&s->d1->timeout, 0, sizeof(s->d1->timeout));
+ memset(&s->d1->next_timeout, 0, sizeof(s->d1->next_timeout));
+ s->d1->timeout_duration_us = 1000000;
+ BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
+ &(s->d1->next_timeout));
+ /* Clear retransmission buffer */
+ dtls1_clear_sent_buffer(s);
+}
int dtls1_check_timeout_num(SSL *s)
- {
- s->d1->timeout.num_alerts++;
+{
+ size_t mtu;
+
+ s->d1->timeout.num_alerts++;
+
+ /* Reduce MTU after 2 unsuccessful retransmissions */
+ if (s->d1->timeout.num_alerts > 2
+ && !(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) {
+ mtu =
+ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, NULL);
+ if (mtu < s->d1->mtu)
+ s->d1->mtu = mtu;
+ }
+
+ if (s->d1->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) {
+ /* fail the connection, enough alerts have been sent */
+ SSLfatal(s, SSL_AD_NO_ALERT, SSL_F_DTLS1_CHECK_TIMEOUT_NUM,
+ SSL_R_READ_TIMEOUT_EXPIRED);
+ return -1;
+ }
+
+ return 0;
+}
- /* 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);
- }
+int dtls1_handle_timeout(SSL *s)
+{
+ /* if no timer is expired, don't do anything */
+ if (!dtls1_is_timer_expired(s)) {
+ return 0;
+ }
+
+ if (s->d1->timer_cb != NULL)
+ s->d1->timeout_duration_us = s->d1->timer_cb(s, s->d1->timeout_duration_us);
+ else
+ dtls1_double_timeout(s);
+
+ if (dtls1_check_timeout_num(s) < 0) {
+ /* SSLfatal() already called */
+ 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);
+ /* Calls SSLfatal() if required */
+ return dtls1_retransmit_buffered_messages(s);
+}
- if (s->d1->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT)
- {
- /* fail the connection, enough alerts have been sent */
- SSLerr(SSL_F_DTLS1_CHECK_TIMEOUT_NUM,SSL_R_READ_TIMEOUT_EXPIRED);
- return -1;
- }
+static void get_current_time(struct timeval *t)
+{
+#if defined(_WIN32)
+ SYSTEMTIME st;
+ union {
+ unsigned __int64 ul;
+ FILETIME ft;
+ } now;
+
+ GetSystemTime(&st);
+ SystemTimeToFileTime(&st, &now.ft);
+ /* re-bias to 1/1/1970 */
+# ifdef __MINGW32__
+ now.ul -= 116444736000000000ULL;
+# else
+ /* *INDENT-OFF* */
+ now.ul -= 116444736000000000UI64;
+ /* *INDENT-ON* */
+# endif
+ t->tv_sec = (long)(now.ul / 10000000);
+ t->tv_usec = ((int)(now.ul % 10000000)) / 10;
+#else
+ gettimeofday(t, NULL);
+#endif
+}
- return 0;
- }
+#define LISTEN_SUCCESS 2
+#define LISTEN_SEND_VERIFY_REQUEST 1
-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;
- }
-
-#ifndef OPENSSL_NO_HEARTBEATS
- if (s->tlsext_hb_pending)
- {
- s->tlsext_hb_pending = 0;
- return dtls1_heartbeat(s);
- }
-#endif
+#ifndef OPENSSL_NO_SOCK
+int DTLSv1_listen(SSL *s, BIO_ADDR *client)
+{
+ int next, n, ret = 0, clearpkt = 0;
+ unsigned char cookie[DTLS1_COOKIE_LENGTH];
+ unsigned char seq[SEQ_NUM_SIZE];
+ const unsigned char *data;
+ unsigned char *buf;
+ size_t fragoff, fraglen, msglen;
+ unsigned int rectype, versmajor, msgseq, msgtype, clientvers, cookielen;
+ BIO *rbio, *wbio;
+ BUF_MEM *bufm;
+ BIO_ADDR *tmpclient = NULL;
+ PACKET pkt, msgpkt, msgpayload, session, cookiepkt;
+
+ if (s->handshake_func == NULL) {
+ /* Not properly initialized yet */
+ SSL_set_accept_state(s);
+ }
+
+ /* Ensure there is no state left over from a previous invocation */
+ if (!SSL_clear(s))
+ return -1;
+
+ ERR_clear_error();
+
+ rbio = SSL_get_rbio(s);
+ wbio = SSL_get_wbio(s);
+
+ if (!rbio || !wbio) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_BIO_NOT_SET);
+ return -1;
+ }
+
+ /*
+ * We only peek at incoming ClientHello's until we're sure we are going to
+ * to respond with a HelloVerifyRequest. If its a ClientHello with a valid
+ * cookie then we leave it in the BIO for accept to handle.
+ */
+ BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_PEEK_MODE, 1, NULL);
+
+ /*
+ * Note: This check deliberately excludes DTLS1_BAD_VER because that version
+ * requires the MAC to be calculated *including* the first ClientHello
+ * (without the cookie). Since DTLSv1_listen is stateless that cannot be
+ * supported. DTLS1_BAD_VER must use cookies in a stateful manner (e.g. via
+ * SSL_accept)
+ */
+ if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_UNSUPPORTED_SSL_VERSION);
+ return -1;
+ }
+
+ if (s->init_buf == NULL) {
+ if ((bufm = BUF_MEM_new()) == NULL) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, ERR_R_MALLOC_FAILURE);
+ return -1;
+ }
- dtls1_start_timer(s);
- return dtls1_retransmit_buffered_messages(s);
- }
+ if (!BUF_MEM_grow(bufm, SSL3_RT_MAX_PLAIN_LENGTH)) {
+ BUF_MEM_free(bufm);
+ SSLerr(SSL_F_DTLSV1_LISTEN, ERR_R_MALLOC_FAILURE);
+ return -1;
+ }
+ s->init_buf = bufm;
+ }
+ buf = (unsigned char *)s->init_buf->data;
+
+ do {
+ /* Get a packet */
+
+ clear_sys_error();
+ /*
+ * Technically a ClientHello could be SSL3_RT_MAX_PLAIN_LENGTH
+ * + DTLS1_RT_HEADER_LENGTH bytes long. Normally init_buf does not store
+ * the record header as well, but we do here. We've set up init_buf to
+ * be the standard size for simplicity. In practice we shouldn't ever
+ * receive a ClientHello as long as this. If we do it will get dropped
+ * in the record length check below.
+ */
+ n = BIO_read(rbio, buf, SSL3_RT_MAX_PLAIN_LENGTH);
+
+ if (n <= 0) {
+ if (BIO_should_retry(rbio)) {
+ /* Non-blocking IO */
+ goto end;
+ }
+ return -1;
+ }
-static void get_current_time(struct timeval *t)
+ /* If we hit any problems we need to clear this packet from the BIO */
+ clearpkt = 1;
+
+ if (!PACKET_buf_init(&pkt, buf, n)) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, ERR_R_INTERNAL_ERROR);
+ return -1;
+ }
+
+ /*
+ * Parse the received record. If there are any problems with it we just
+ * dump it - with no alert. RFC6347 says this "Unlike TLS, DTLS is
+ * resilient in the face of invalid records (e.g., invalid formatting,
+ * length, MAC, etc.). In general, invalid records SHOULD be silently
+ * discarded, thus preserving the association; however, an error MAY be
+ * logged for diagnostic purposes."
+ */
+
+ /* this packet contained a partial record, dump it */
+ if (n < DTLS1_RT_HEADER_LENGTH) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_RECORD_TOO_SMALL);
+ goto end;
+ }
+
+ if (s->msg_callback)
+ s->msg_callback(0, 0, SSL3_RT_HEADER, buf,
+ DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg);
+
+ /* Get the record header */
+ if (!PACKET_get_1(&pkt, &rectype)
+ || !PACKET_get_1(&pkt, &versmajor)) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_LENGTH_MISMATCH);
+ goto end;
+ }
+
+ if (rectype != SSL3_RT_HANDSHAKE) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_UNEXPECTED_MESSAGE);
+ goto end;
+ }
+
+ /*
+ * Check record version number. We only check that the major version is
+ * the same.
+ */
+ if (versmajor != DTLS1_VERSION_MAJOR) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
+ goto end;
+ }
+
+ if (!PACKET_forward(&pkt, 1)
+ /* Save the sequence number: 64 bits, with top 2 bytes = epoch */
+ || !PACKET_copy_bytes(&pkt, seq, SEQ_NUM_SIZE)
+ || !PACKET_get_length_prefixed_2(&pkt, &msgpkt)) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_LENGTH_MISMATCH);
+ goto end;
+ }
+ /*
+ * We allow data remaining at the end of the packet because there could
+ * be a second record (but we ignore it)
+ */
+
+ /* This is an initial ClientHello so the epoch has to be 0 */
+ if (seq[0] != 0 || seq[1] != 0) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_UNEXPECTED_MESSAGE);
+ goto end;
+ }
+
+ /* Get a pointer to the raw message for the later callback */
+ data = PACKET_data(&msgpkt);
+
+ /* Finished processing the record header, now process the message */
+ if (!PACKET_get_1(&msgpkt, &msgtype)
+ || !PACKET_get_net_3_len(&msgpkt, &msglen)
+ || !PACKET_get_net_2(&msgpkt, &msgseq)
+ || !PACKET_get_net_3_len(&msgpkt, &fragoff)
+ || !PACKET_get_net_3_len(&msgpkt, &fraglen)
+ || !PACKET_get_sub_packet(&msgpkt, &msgpayload, fraglen)
+ || PACKET_remaining(&msgpkt) != 0) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_LENGTH_MISMATCH);
+ goto end;
+ }
+
+ if (msgtype != SSL3_MT_CLIENT_HELLO) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_UNEXPECTED_MESSAGE);
+ goto end;
+ }
+
+ /* Message sequence number can only be 0 or 1 */
+ if (msgseq > 2) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_INVALID_SEQUENCE_NUMBER);
+ goto end;
+ }
+
+ /*
+ * We don't support fragment reassembly for ClientHellos whilst
+ * listening because that would require server side state (which is
+ * against the whole point of the ClientHello/HelloVerifyRequest
+ * mechanism). Instead we only look at the first ClientHello fragment
+ * and require that the cookie must be contained within it.
+ */
+ if (fragoff != 0 || fraglen > msglen) {
+ /* Non initial ClientHello fragment (or bad fragment) */
+ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_FRAGMENTED_CLIENT_HELLO);
+ goto end;
+ }
+
+ if (s->msg_callback)
+ s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, data,
+ fraglen + DTLS1_HM_HEADER_LENGTH, s,
+ s->msg_callback_arg);
+
+ if (!PACKET_get_net_2(&msgpayload, &clientvers)) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_LENGTH_MISMATCH);
+ goto end;
+ }
+
+ /*
+ * Verify client version is supported
+ */
+ if (DTLS_VERSION_LT(clientvers, (unsigned int)s->method->version) &&
+ s->method->version != DTLS_ANY_VERSION) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_WRONG_VERSION_NUMBER);
+ goto end;
+ }
+
+ if (!PACKET_forward(&msgpayload, SSL3_RANDOM_SIZE)
+ || !PACKET_get_length_prefixed_1(&msgpayload, &session)
+ || !PACKET_get_length_prefixed_1(&msgpayload, &cookiepkt)) {
+ /*
+ * Could be malformed or the cookie does not fit within the initial
+ * ClientHello fragment. Either way we can't handle it.
+ */
+ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_LENGTH_MISMATCH);
+ goto end;
+ }
+
+ /*
+ * Check if we have a cookie or not. If not we need to send a
+ * HelloVerifyRequest.
+ */
+ if (PACKET_remaining(&cookiepkt) == 0) {
+ next = LISTEN_SEND_VERIFY_REQUEST;
+ } else {
+ /*
+ * We have a cookie, so lets check it.
+ */
+ if (s->ctx->app_verify_cookie_cb == NULL) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_NO_VERIFY_COOKIE_CALLBACK);
+ /* This is fatal */
+ return -1;
+ }
+ if (s->ctx->app_verify_cookie_cb(s, PACKET_data(&cookiepkt),
+ (unsigned int)PACKET_remaining(&cookiepkt)) == 0) {
+ /*
+ * We treat invalid cookies in the same was as no cookie as
+ * per RFC6347
+ */
+ next = LISTEN_SEND_VERIFY_REQUEST;
+ } else {
+ /* Cookie verification succeeded */
+ next = LISTEN_SUCCESS;
+ }
+ }
+
+ if (next == LISTEN_SEND_VERIFY_REQUEST) {
+ WPACKET wpkt;
+ unsigned int version;
+ size_t wreclen;
+
+ /*
+ * There was no cookie in the ClientHello so we need to send a
+ * HelloVerifyRequest. If this fails we do not worry about trying
+ * to resend, we just drop it.
+ */
+
+ /*
+ * Dump the read packet, we don't need it any more. Ignore return
+ * value
+ */
+ BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_PEEK_MODE, 0, NULL);
+ BIO_read(rbio, buf, SSL3_RT_MAX_PLAIN_LENGTH);
+ BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_PEEK_MODE, 1, NULL);
+
+ /* Generate the cookie */
+ if (s->ctx->app_gen_cookie_cb == NULL ||
+ s->ctx->app_gen_cookie_cb(s, cookie, &cookielen) == 0 ||
+ cookielen > 255) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_COOKIE_GEN_CALLBACK_FAILURE);
+ /* This is fatal */
+ return -1;
+ }
+
+ /*
+ * Special case: for hello verify request, client version 1.0 and we
+ * haven't decided which version to use yet send back using version
+ * 1.0 header: otherwise some clients will ignore it.
+ */
+ version = (s->method->version == DTLS_ANY_VERSION) ? DTLS1_VERSION
+ : s->version;
+
+ /* Construct the record and message headers */
+ if (!WPACKET_init(&wpkt, s->init_buf)
+ || !WPACKET_put_bytes_u8(&wpkt, SSL3_RT_HANDSHAKE)
+ || !WPACKET_put_bytes_u16(&wpkt, version)
+ /*
+ * Record sequence number is always the same as in the
+ * received ClientHello
+ */
+ || !WPACKET_memcpy(&wpkt, seq, SEQ_NUM_SIZE)
+ /* End of record, start sub packet for message */
+ || !WPACKET_start_sub_packet_u16(&wpkt)
+ /* Message type */
+ || !WPACKET_put_bytes_u8(&wpkt,
+ DTLS1_MT_HELLO_VERIFY_REQUEST)
+ /*
+ * Message length - doesn't follow normal TLS convention:
+ * the length isn't the last thing in the message header.
+ * We'll need to fill this in later when we know the
+ * length. Set it to zero for now
+ */
+ || !WPACKET_put_bytes_u24(&wpkt, 0)
+ /*
+ * Message sequence number is always 0 for a
+ * HelloVerifyRequest
+ */
+ || !WPACKET_put_bytes_u16(&wpkt, 0)
+ /*
+ * We never fragment a HelloVerifyRequest, so fragment
+ * offset is 0
+ */
+ || !WPACKET_put_bytes_u24(&wpkt, 0)
+ /*
+ * Fragment length is the same as message length, but
+ * this *is* the last thing in the message header so we
+ * can just start a sub-packet. No need to come back
+ * later for this one.
+ */
+ || !WPACKET_start_sub_packet_u24(&wpkt)
+ /* Create the actual HelloVerifyRequest body */
+ || !dtls_raw_hello_verify_request(&wpkt, cookie, cookielen)
+ /* Close message body */
+ || !WPACKET_close(&wpkt)
+ /* Close record body */
+ || !WPACKET_close(&wpkt)
+ || !WPACKET_get_total_written(&wpkt, &wreclen)
+ || !WPACKET_finish(&wpkt)) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, ERR_R_INTERNAL_ERROR);
+ WPACKET_cleanup(&wpkt);
+ /* This is fatal */
+ return -1;
+ }
+
+ /*
+ * Fix up the message len in the message header. Its the same as the
+ * fragment len which has been filled in by WPACKET, so just copy
+ * that. Destination for the message len is after the record header
+ * plus one byte for the message content type. The source is the
+ * last 3 bytes of the message header
+ */
+ memcpy(&buf[DTLS1_RT_HEADER_LENGTH + 1],
+ &buf[DTLS1_RT_HEADER_LENGTH + DTLS1_HM_HEADER_LENGTH - 3],
+ 3);
+
+ if (s->msg_callback)
+ s->msg_callback(1, 0, SSL3_RT_HEADER, buf,
+ DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg);
+
+ if ((tmpclient = BIO_ADDR_new()) == NULL) {
+ SSLerr(SSL_F_DTLSV1_LISTEN, ERR_R_MALLOC_FAILURE);
+ goto end;
+ }
+
+ /*
+ * This is unnecessary if rbio and wbio are one and the same - but
+ * maybe they're not. We ignore errors here - some BIOs do not
+ * support this.
+ */
+ if (BIO_dgram_get_peer(rbio, tmpclient) > 0) {
+ (void)BIO_dgram_set_peer(wbio, tmpclient);
+ }
+ BIO_ADDR_free(tmpclient);
+ tmpclient = NULL;
+
+ /* TODO(size_t): convert this call */
+ if (BIO_write(wbio, buf, wreclen) < (int)wreclen) {
+ if (BIO_should_retry(wbio)) {
+ /*
+ * Non-blocking IO...but we're stateless, so we're just
+ * going to drop this packet.
+ */
+ goto end;
+ }
+ return -1;
+ }
+
+ if (BIO_flush(wbio) <= 0) {
+ if (BIO_should_retry(wbio)) {
+ /*
+ * Non-blocking IO...but we're stateless, so we're just
+ * going to drop this packet.
+ */
+ goto end;
+ }
+ return -1;
+ }
+ }
+ } while (next != LISTEN_SUCCESS);
+
+ /*
+ * Set expected sequence numbers to continue the handshake.
+ */
+ s->d1->handshake_read_seq = 1;
+ s->d1->handshake_write_seq = 1;
+ s->d1->next_handshake_write_seq = 1;
+ DTLS_RECORD_LAYER_set_write_sequence(&s->rlayer, seq);
+
+ /*
+ * We are doing cookie exchange, so make sure we set that option in the
+ * SSL object
+ */
+ SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
+
+ /*
+ * Tell the state machine that we've done the initial hello verify
+ * exchange
+ */
+ ossl_statem_set_hello_verify_done(s);
+
+ /*
+ * Some BIOs may not support this. If we fail we clear the client address
+ */
+ if (BIO_dgram_get_peer(rbio, client) <= 0)
+ BIO_ADDR_clear(client);
+
+ ret = 1;
+ clearpkt = 0;
+ end:
+ BIO_ADDR_free(tmpclient);
+ BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_PEEK_MODE, 0, NULL);
+ if (clearpkt) {
+ /* Dump this packet. Ignore return value */
+ BIO_read(rbio, buf, SSL3_RT_MAX_PLAIN_LENGTH);
+ }
+ return ret;
+}
+#endif
+
+static int dtls1_handshake_write(SSL *s)
{
-#if defined(_WIN32)
- SYSTEMTIME st;
- union { unsigned __int64 ul; FILETIME ft; } now;
+ return dtls1_do_write(s, SSL3_RT_HANDSHAKE);
+}
- GetSystemTime(&st);
- SystemTimeToFileTime(&st,&now.ft);
-#ifdef __MINGW32__
- now.ul -= 116444736000000000ULL;
-#else
- now.ul -= 116444736000000000UI64; /* re-bias to 1/1/1970 */
+int dtls1_shutdown(SSL *s)
+{
+ int ret;
+#ifndef OPENSSL_NO_SCTP
+ BIO *wbio;
+
+ wbio = SSL_get_wbio(s);
+ if (wbio != NULL && BIO_dgram_is_sctp(wbio) &&
+ !(s->shutdown & SSL_SENT_SHUTDOWN)) {
+ ret = BIO_dgram_sctp_wait_for_dry(wbio);
+ if (ret < 0)
+ return -1;
+
+ if (ret == 0)
+ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN, 1,
+ NULL);
+ }
#endif
- t->tv_sec = (long)(now.ul/10000000);
- t->tv_usec = ((int)(now.ul%10000000))/10;
-#elif defined(OPENSSL_SYS_VMS)
- struct timeb tb;
- ftime(&tb);
- t->tv_sec = (long)tb.time;
- t->tv_usec = (long)tb.millitm * 1000;
-#else
- gettimeofday(t, NULL);
+ ret = ssl3_shutdown(s);
+#ifndef OPENSSL_NO_SCTP
+ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN, 0, NULL);
#endif
+ return ret;
}
-int dtls1_listen(SSL *s, struct sockaddr *client)
- {
- int ret;
-
- SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
- s->d1->listen = 1;
-
- ret = SSL_accept(s);
- if (ret <= 0) return ret;
-
- (void) BIO_dgram_get_peer(SSL_get_rbio(s), client);
- return 1;
- }
-
-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);
- }
+int dtls1_query_mtu(SSL *s)
+{
+ if (s->d1->link_mtu) {
+ s->d1->mtu =
+ s->d1->link_mtu - BIO_dgram_get_mtu_overhead(SSL_get_wbio(s));
+ s->d1->link_mtu = 0;
+ }
+
+ /* AHA! Figure out the MTU, and stick to the right size */
+ if (s->d1->mtu < dtls1_min_mtu(s)) {
+ if (!(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) {
+ s->d1->mtu =
+ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
+
+ /*
+ * I've seen the kernel return bogus numbers when it doesn't know
+ * (initial write), so just make sure we have a reasonable number
+ */
+ if (s->d1->mtu < dtls1_min_mtu(s)) {
+ /* Set to min mtu */
+ s->d1->mtu = dtls1_min_mtu(s);
+ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU,
+ (long)s->d1->mtu, NULL);
+ }
+ } else
+ return 0;
+ }
+ return 1;
+}
-static int dtls1_handshake_write(SSL *s)
- {
- return dtls1_do_write(s, SSL3_RT_HANDSHAKE);
- }
+static size_t dtls1_link_min_mtu(void)
+{
+ return (g_probable_mtu[(sizeof(g_probable_mtu) /
+ sizeof(g_probable_mtu[0])) - 1]);
+}
+
+size_t dtls1_min_mtu(SSL *s)
+{
+ return dtls1_link_min_mtu() - BIO_dgram_get_mtu_overhead(SSL_get_wbio(s));
+}
+
+size_t DTLS_get_data_mtu(const SSL *s)
+{
+ size_t mac_overhead, int_overhead, blocksize, ext_overhead;
+ const SSL_CIPHER *ciph = SSL_get_current_cipher(s);
+ size_t mtu = s->d1->mtu;
+
+ if (ciph == NULL)
+ return 0;
+
+ if (!ssl_cipher_get_overhead(ciph, &mac_overhead, &int_overhead,
+ &blocksize, &ext_overhead))
+ return 0;
+
+ if (SSL_READ_ETM(s))
+ ext_overhead += mac_overhead;
+ else
+ int_overhead += mac_overhead;
+
+ /* Subtract external overhead (e.g. IV/nonce, separate MAC) */
+ if (ext_overhead + DTLS1_RT_HEADER_LENGTH >= mtu)
+ return 0;
+ mtu -= ext_overhead + DTLS1_RT_HEADER_LENGTH;
+
+ /* Round encrypted payload down to cipher block size (for CBC etc.)
+ * No check for overflow since 'mtu % blocksize' cannot exceed mtu. */
+ if (blocksize)
+ mtu -= (mtu % blocksize);
+
+ /* Subtract internal overhead (e.g. CBC padding len byte) */
+ if (int_overhead >= mtu)
+ return 0;
+ mtu -= int_overhead;
+
+ return mtu;
+}
+
+void DTLS_set_timer_cb(SSL *s, DTLS_timer_cb cb)
+{
+ s->d1->timer_cb = cb;
+}
projects / openssl.git / blobdiff