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- /*
- * 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 "../crypto/internal.h"
- #include "internal.h"
-
-
- static int dtls1_version_from_wire(uint16_t *out_version,
- uint16_t wire_version) {
- switch (wire_version) {
- case DTLS1_VERSION:
- /* DTLS 1.0 maps to TLS 1.1, not TLS 1.0. */
- *out_version = TLS1_1_VERSION;
- return 1;
- case DTLS1_2_VERSION:
- *out_version = TLS1_2_VERSION;
- return 1;
- }
-
- return 0;
- }
-
- static uint16_t dtls1_version_to_wire(uint16_t version) {
- switch (version) {
- case TLS1_1_VERSION:
- /* DTLS 1.0 maps to TLS 1.1, not TLS 1.0. */
- return DTLS1_VERSION;
- case TLS1_2_VERSION:
- return DTLS1_2_VERSION;
- }
-
- /* It is an error to use this function with an invalid version. */
- assert(0);
- return 0;
- }
-
- static int dtls1_supports_cipher(const SSL_CIPHER *cipher) {
- return cipher->algorithm_enc != SSL_eNULL;
- }
-
- static void dtls1_expect_flight(SSL *ssl) { dtls1_start_timer(ssl); }
-
- static void dtls1_received_flight(SSL *ssl) { dtls1_stop_timer(ssl); }
-
- 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++;
- OPENSSL_memset(&ssl->d1->bitmap, 0, sizeof(ssl->d1->bitmap));
- OPENSSL_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++;
- OPENSSL_memcpy(ssl->d1->last_write_sequence, ssl->s3->write_sequence,
- sizeof(ssl->s3->write_sequence));
- OPENSSL_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_get_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_add_message,
- dtls1_add_change_cipher_spec,
- dtls1_add_alert,
- dtls1_flush_flight,
- 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,
- &ssl_crypto_x509_method,
- };
- return &kMethod;
- }
-
- /* Legacy version-locked methods. */
-
- const SSL_METHOD *DTLSv1_2_method(void) {
- static const SSL_METHOD kMethod = {
- DTLS1_2_VERSION,
- &kDTLSProtocolMethod,
- &ssl_crypto_x509_method,
- };
- return &kMethod;
- }
-
- const SSL_METHOD *DTLSv1_method(void) {
- static const SSL_METHOD kMethod = {
- DTLS1_VERSION,
- &kDTLSProtocolMethod,
- &ssl_crypto_x509_method,
- };
- 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();
- }
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