blob: e2e17265a06ae199c1453906e35fd1b2472139c7 [file] [log] [blame]
/*
* 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 <string.h>
#include <openssl/buf.h>
#include <openssl/err.h>
#include "internal.h"
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);
}
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;
}
static const SSL_PROTOCOL_METHOD kDTLSProtocolMethod = {
1 /* is_dtls */,
TLS1_1_VERSION,
TLS1_2_VERSION,
dtls1_version_from_wire,
dtls1_version_to_wire,
dtls1_new,
dtls1_free,
dtls1_get_message,
dtls1_hash_current_message,
dtls1_release_current_message,
dtls1_read_app_data,
dtls1_read_change_cipher_spec,
dtls1_read_close_notify,
dtls1_write_app_data,
dtls1_dispatch_alert,
dtls1_supports_cipher,
dtls1_init_message,
dtls1_finish_message,
dtls1_write_message,
dtls1_send_change_cipher_spec,
dtls1_expect_flight,
dtls1_received_flight,
dtls1_set_read_state,
dtls1_set_write_state,
};
const SSL_METHOD *DTLS_method(void) {
static const SSL_METHOD kMethod = {
0,
&kDTLSProtocolMethod,
};
return &kMethod;
}
/* Legacy version-locked methods. */
const SSL_METHOD *DTLSv1_2_method(void) {
static const SSL_METHOD kMethod = {
DTLS1_2_VERSION,
&kDTLSProtocolMethod,
};
return &kMethod;
}
const SSL_METHOD *DTLSv1_method(void) {
static const SSL_METHOD kMethod = {
DTLS1_VERSION,
&kDTLSProtocolMethod,
};
return &kMethod;
}
/* Legacy side-specific methods. */
const SSL_METHOD *DTLSv1_2_server_method(void) {
return DTLSv1_2_method();
}
const SSL_METHOD *DTLSv1_server_method(void) {
return DTLSv1_method();
}
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();
}