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). */
|
|
|
|
|
2015-09-15 06:48:04 +01:00
|
|
|
#include <openssl/ssl.h>
|
|
|
|
|
2016-06-21 15:33:21 +01:00
|
|
|
#include <assert.h>
|
2016-07-15 04:10:43 +01:00
|
|
|
#include <string.h>
|
2016-06-21 15:33:21 +01:00
|
|
|
|
2016-07-08 17:16:50 +01:00
|
|
|
#include <openssl/buf.h>
|
2016-07-15 04:10:43 +01:00
|
|
|
#include <openssl/err.h>
|
2016-07-08 17:16:50 +01:00
|
|
|
|
2015-04-08 03:38:30 +01:00
|
|
|
#include "internal.h"
|
2014-06-20 20:00:00 +01:00
|
|
|
|
|
|
|
|
2016-06-21 15:33:21 +01:00
|
|
|
static uint16_t dtls1_version_from_wire(uint16_t wire_version) {
|
|
|
|
uint16_t tls_version = ~wire_version;
|
|
|
|
uint16_t version = tls_version + 0x0201;
|
|
|
|
/* If either component overflowed, clamp it so comparisons still work. */
|
|
|
|
if ((version >> 8) < (tls_version >> 8)) {
|
|
|
|
version = 0xff00 | (version & 0xff);
|
|
|
|
}
|
|
|
|
if ((version & 0xff) < (tls_version & 0xff)) {
|
|
|
|
version = (version & 0xff00) | 0xff;
|
|
|
|
}
|
|
|
|
/* DTLS 1.0 maps to TLS 1.1, not TLS 1.0. */
|
|
|
|
if (version == TLS1_VERSION) {
|
|
|
|
version = TLS1_1_VERSION;
|
|
|
|
}
|
|
|
|
return version;
|
|
|
|
}
|
|
|
|
|
|
|
|
static uint16_t dtls1_version_to_wire(uint16_t version) {
|
|
|
|
assert(version >= TLS1_1_VERSION);
|
|
|
|
|
|
|
|
/* DTLS 1.0 maps to TLS 1.1, not TLS 1.0. */
|
|
|
|
if (version == TLS1_1_VERSION) {
|
|
|
|
return DTLS1_VERSION;
|
|
|
|
}
|
|
|
|
return ~(version - 0x0201);
|
|
|
|
}
|
|
|
|
|
2016-07-15 04:10:43 +01:00
|
|
|
static int dtls1_set_read_state(SSL *ssl, SSL_AEAD_CTX *aead_ctx) {
|
|
|
|
/* Cipher changes are illegal when there are buffered incoming messages. */
|
|
|
|
if (dtls_has_incoming_messages(ssl)) {
|
|
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_BUFFERED_MESSAGES_ON_CIPHER_CHANGE);
|
|
|
|
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
|
|
|
|
SSL_AEAD_CTX_free(aead_ctx);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
ssl->d1->r_epoch++;
|
|
|
|
memset(&ssl->d1->bitmap, 0, sizeof(ssl->d1->bitmap));
|
|
|
|
memset(ssl->s3->read_sequence, 0, sizeof(ssl->s3->read_sequence));
|
|
|
|
|
|
|
|
SSL_AEAD_CTX_free(ssl->s3->aead_read_ctx);
|
|
|
|
ssl->s3->aead_read_ctx = aead_ctx;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int dtls1_set_write_state(SSL *ssl, SSL_AEAD_CTX *aead_ctx) {
|
|
|
|
ssl->d1->w_epoch++;
|
|
|
|
memcpy(ssl->d1->last_write_sequence, ssl->s3->write_sequence,
|
|
|
|
sizeof(ssl->s3->write_sequence));
|
|
|
|
memset(ssl->s3->write_sequence, 0, sizeof(ssl->s3->write_sequence));
|
|
|
|
|
|
|
|
SSL_AEAD_CTX_free(ssl->s3->aead_write_ctx);
|
|
|
|
ssl->s3->aead_write_ctx = aead_ctx;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2016-07-08 17:05:45 +01:00
|
|
|
static const SSL_PROTOCOL_METHOD kDTLSProtocolMethod = {
|
2015-03-05 06:56:32 +00:00
|
|
|
1 /* is_dtls */,
|
2016-06-21 15:33:21 +01:00
|
|
|
TLS1_1_VERSION,
|
|
|
|
TLS1_2_VERSION,
|
|
|
|
dtls1_version_from_wire,
|
|
|
|
dtls1_version_to_wire,
|
2015-03-05 06:56:32 +00:00
|
|
|
dtls1_new,
|
|
|
|
dtls1_free,
|
|
|
|
dtls1_get_message,
|
2016-07-08 17:34:05 +01:00
|
|
|
dtls1_hash_current_message,
|
2016-07-27 22:51:49 +01:00
|
|
|
dtls1_release_current_message,
|
2015-05-30 21:22:10 +01:00
|
|
|
dtls1_read_app_data,
|
2015-11-26 07:16:49 +00:00
|
|
|
dtls1_read_change_cipher_spec,
|
2015-05-30 21:22:10 +01:00
|
|
|
dtls1_read_close_notify,
|
2015-05-30 21:14:58 +01:00
|
|
|
dtls1_write_app_data,
|
2015-03-05 06:56:32 +00:00
|
|
|
dtls1_dispatch_alert,
|
2015-05-30 22:03:14 +01:00
|
|
|
dtls1_supports_cipher,
|
2016-06-17 23:48:29 +01:00
|
|
|
dtls1_init_message,
|
|
|
|
dtls1_finish_message,
|
|
|
|
dtls1_write_message,
|
2016-06-07 21:40:46 +01:00
|
|
|
dtls1_send_change_cipher_spec,
|
|
|
|
dtls1_expect_flight,
|
|
|
|
dtls1_received_flight,
|
2016-07-15 04:10:43 +01:00
|
|
|
dtls1_set_read_state,
|
|
|
|
dtls1_set_write_state,
|
2014-12-12 20:55:27 +00:00
|
|
|
};
|
2014-06-20 20:00:00 +01:00
|
|
|
|
2014-12-12 20:55:27 +00:00
|
|
|
const SSL_METHOD *DTLS_method(void) {
|
2016-07-08 17:05:45 +01:00
|
|
|
static const SSL_METHOD kMethod = {
|
2014-12-12 20:55:27 +00:00
|
|
|
0,
|
2016-07-08 17:05:45 +01:00
|
|
|
&kDTLSProtocolMethod,
|
2014-12-12 20:55:27 +00:00
|
|
|
};
|
2016-07-08 17:05:45 +01:00
|
|
|
return &kMethod;
|
2014-12-12 20:55:27 +00:00
|
|
|
}
|
2014-06-20 20:00:00 +01:00
|
|
|
|
2014-12-12 20:55:27 +00:00
|
|
|
/* Legacy version-locked methods. */
|
2014-11-23 20:47:20 +00:00
|
|
|
|
2014-12-12 20:55:27 +00:00
|
|
|
const SSL_METHOD *DTLSv1_2_method(void) {
|
2016-07-08 17:05:45 +01:00
|
|
|
static const SSL_METHOD kMethod = {
|
2014-12-12 20:55:27 +00:00
|
|
|
DTLS1_2_VERSION,
|
2016-07-08 17:05:45 +01:00
|
|
|
&kDTLSProtocolMethod,
|
2014-12-12 20:55:27 +00:00
|
|
|
};
|
2016-07-08 17:05:45 +01:00
|
|
|
return &kMethod;
|
2014-12-12 20:55:27 +00:00
|
|
|
}
|
2014-11-23 20:47:20 +00:00
|
|
|
|
2014-12-12 20:55:27 +00:00
|
|
|
const SSL_METHOD *DTLSv1_method(void) {
|
2016-07-08 17:05:45 +01:00
|
|
|
static const SSL_METHOD kMethod = {
|
2014-12-12 20:55:27 +00:00
|
|
|
DTLS1_VERSION,
|
2016-07-08 17:05:45 +01:00
|
|
|
&kDTLSProtocolMethod,
|
2014-12-12 20:55:27 +00:00
|
|
|
};
|
2016-07-08 17:05:45 +01:00
|
|
|
return &kMethod;
|
2014-12-12 20:55:27 +00:00
|
|
|
}
|
2014-11-23 20:47:20 +00:00
|
|
|
|
2014-12-12 20:55:27 +00:00
|
|
|
/* Legacy side-specific methods. */
|
2014-11-23 20:47:20 +00:00
|
|
|
|
2014-12-12 20:55:27 +00:00
|
|
|
const SSL_METHOD *DTLSv1_2_server_method(void) {
|
|
|
|
return DTLSv1_2_method();
|
|
|
|
}
|
2014-11-23 20:47:20 +00:00
|
|
|
|
2014-12-12 20:55:27 +00:00
|
|
|
const SSL_METHOD *DTLSv1_server_method(void) {
|
|
|
|
return DTLSv1_method();
|
|
|
|
}
|
2014-11-23 20:47:20 +00:00
|
|
|
|
2014-12-12 20:55:27 +00:00
|
|
|
const SSL_METHOD *DTLSv1_2_client_method(void) {
|
|
|
|
return DTLSv1_2_method();
|
|
|
|
}
|
|
|
|
|
|
|
|
const SSL_METHOD *DTLSv1_client_method(void) {
|
|
|
|
return DTLSv1_method();
|
|
|
|
}
|
|
|
|
|
|
|
|
const SSL_METHOD *DTLS_server_method(void) {
|
|
|
|
return DTLS_method();
|
|
|
|
}
|
|
|
|
|
|
|
|
const SSL_METHOD *DTLS_client_method(void) {
|
|
|
|
return DTLS_method();
|
|
|
|
}
|