--- /dev/null
+/*
+ * 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/ssl.h>
+
+#include <assert.h>
+#include <limits.h>
+#include <string.h>
+
+#include <openssl/err.h>
+#include <openssl/mem.h>
+#include <openssl/nid.h>
+
+#include "../crypto/internal.h"
+#include "internal.h"
+
+
+namespace bssl {
+
+// DTLS1_MTU_TIMEOUTS is the maximum number of timeouts to expire
+// before starting to decrease the MTU.
+#define DTLS1_MTU_TIMEOUTS 2
+
+// DTLS1_MAX_TIMEOUTS is the maximum number of timeouts to expire
+// before failing the DTLS handshake.
+#define DTLS1_MAX_TIMEOUTS 12
+
+DTLS1_STATE::DTLS1_STATE()
+ : has_change_cipher_spec(false),
+ outgoing_messages_complete(false),
+ flight_has_reply(false) {}
+
+DTLS1_STATE::~DTLS1_STATE() {}
+
+bool dtls1_new(SSL *ssl) {
+ if (!ssl3_new(ssl)) {
+ return false;
+ }
+ UniquePtr<DTLS1_STATE> d1 = MakeUnique<DTLS1_STATE>();
+ if (!d1) {
+ ssl3_free(ssl);
+ return false;
+ }
+
+ ssl->d1 = d1.release();
+
+ // Set the version to the highest supported version.
+ //
+ // TODO(davidben): Move this field into |s3|, have it store the normalized
+ // protocol version, and implement this pre-negotiation quirk in |SSL_version|
+ // at the API boundary rather than in internal state.
+ ssl->version = DTLS1_2_VERSION;
+ return true;
+}
+
+void dtls1_free(SSL *ssl) {
+ ssl3_free(ssl);
+
+ if (ssl == NULL) {
+ return;
+ }
+
+ Delete(ssl->d1);
+ ssl->d1 = NULL;
+}
+
+void dtls1_start_timer(SSL *ssl) {
+ // If timer is not set, initialize duration (by default, 1 second)
+ if (ssl->d1->next_timeout.tv_sec == 0 && ssl->d1->next_timeout.tv_usec == 0) {
+ ssl->d1->timeout_duration_ms = ssl->initial_timeout_duration_ms;
+ }
+
+ // Set timeout to current time
+ ssl_get_current_time(ssl, &ssl->d1->next_timeout);
+
+ // Add duration to current time
+ ssl->d1->next_timeout.tv_sec += ssl->d1->timeout_duration_ms / 1000;
+ ssl->d1->next_timeout.tv_usec += (ssl->d1->timeout_duration_ms % 1000) * 1000;
+ if (ssl->d1->next_timeout.tv_usec >= 1000000) {
+ ssl->d1->next_timeout.tv_sec++;
+ ssl->d1->next_timeout.tv_usec -= 1000000;
+ }
+}
+
+bool dtls1_is_timer_expired(SSL *ssl) {
+ struct timeval timeleft;
+
+ // Get time left until timeout, return false if no timer running
+ if (!DTLSv1_get_timeout(ssl, &timeleft)) {
+ return false;
+ }
+
+ // Return false if timer is not expired yet
+ if (timeleft.tv_sec > 0 || timeleft.tv_usec > 0) {
+ return false;
+ }
+
+ // Timer expired, so return true
+ return true;
+}
+
+static void dtls1_double_timeout(SSL *ssl) {
+ ssl->d1->timeout_duration_ms *= 2;
+ if (ssl->d1->timeout_duration_ms > 60000) {
+ ssl->d1->timeout_duration_ms = 60000;
+ }
+}
+
+void dtls1_stop_timer(SSL *ssl) {
+ ssl->d1->num_timeouts = 0;
+ OPENSSL_memset(&ssl->d1->next_timeout, 0, sizeof(ssl->d1->next_timeout));
+ ssl->d1->timeout_duration_ms = ssl->initial_timeout_duration_ms;
+}
+
+bool dtls1_check_timeout_num(SSL *ssl) {
+ ssl->d1->num_timeouts++;
+
+ // Reduce MTU after 2 unsuccessful retransmissions
+ if (ssl->d1->num_timeouts > DTLS1_MTU_TIMEOUTS &&
+ !(SSL_get_options(ssl) & SSL_OP_NO_QUERY_MTU)) {
+ long mtu = BIO_ctrl(ssl->wbio, BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, NULL);
+ if (mtu >= 0 && mtu <= (1 << 30) && (unsigned)mtu >= dtls1_min_mtu()) {
+ ssl->d1->mtu = (unsigned)mtu;
+ }
+ }
+
+ if (ssl->d1->num_timeouts > DTLS1_MAX_TIMEOUTS) {
+ // fail the connection, enough alerts have been sent
+ OPENSSL_PUT_ERROR(SSL, SSL_R_READ_TIMEOUT_EXPIRED);
+ return false;
+ }
+
+ return true;
+}
+
+} // namespace bssl
+
+using namespace bssl;
+
+void DTLSv1_set_initial_timeout_duration(SSL *ssl, unsigned int duration_ms) {
+ ssl->initial_timeout_duration_ms = duration_ms;
+}
+
+int DTLSv1_get_timeout(const SSL *ssl, struct timeval *out) {
+ if (!SSL_is_dtls(ssl)) {
+ return 0;
+ }
+
+ // If no timeout is set, just return 0.
+ if (ssl->d1->next_timeout.tv_sec == 0 && ssl->d1->next_timeout.tv_usec == 0) {
+ return 0;
+ }
+
+ struct OPENSSL_timeval timenow;
+ ssl_get_current_time(ssl, &timenow);
+
+ // If timer already expired, set remaining time to 0.
+ if (ssl->d1->next_timeout.tv_sec < timenow.tv_sec ||
+ (ssl->d1->next_timeout.tv_sec == timenow.tv_sec &&
+ ssl->d1->next_timeout.tv_usec <= timenow.tv_usec)) {
+ OPENSSL_memset(out, 0, sizeof(*out));
+ return 1;
+ }
+
+ // Calculate time left until timer expires.
+ struct OPENSSL_timeval ret;
+ OPENSSL_memcpy(&ret, &ssl->d1->next_timeout, sizeof(ret));
+ ret.tv_sec -= timenow.tv_sec;
+ if (ret.tv_usec >= timenow.tv_usec) {
+ ret.tv_usec -= timenow.tv_usec;
+ } else {
+ ret.tv_usec = 1000000 + ret.tv_usec - timenow.tv_usec;
+ ret.tv_sec--;
+ }
+
+ // If remaining time is less than 15 ms, set it to 0 to prevent issues
+ // because of small divergences with socket timeouts.
+ if (ret.tv_sec == 0 && ret.tv_usec < 15000) {
+ OPENSSL_memset(&ret, 0, sizeof(ret));
+ }
+
+ // Clamp the result in case of overflow.
+ if (ret.tv_sec > INT_MAX) {
+ assert(0);
+ out->tv_sec = INT_MAX;
+ } else {
+ out->tv_sec = ret.tv_sec;
+ }
+
+ out->tv_usec = ret.tv_usec;
+ return 1;
+}
+
+int DTLSv1_handle_timeout(SSL *ssl) {
+ ssl_reset_error_state(ssl);
+
+ if (!SSL_is_dtls(ssl)) {
+ OPENSSL_PUT_ERROR(SSL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return -1;
+ }
+
+ // If no timer is expired, don't do anything.
+ if (!dtls1_is_timer_expired(ssl)) {
+ return 0;
+ }
+
+ if (!dtls1_check_timeout_num(ssl)) {
+ return -1;
+ }
+
+ dtls1_double_timeout(ssl);
+ dtls1_start_timer(ssl);
+ return dtls1_retransmit_outgoing_messages(ssl);
+}
git://repos.xcallymotion.com / motion2.git / blobdiff