/* * 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 #include #include #include #include "../crypto/internal.h" #include "internal.h" using namespace bssl; static void dtls1_on_handshake_complete(SSL *ssl) { // Stop the reply timer left by the last flight we sent. dtls1_stop_timer(ssl); // If the final flight had a reply, we know the peer has received it. If not, // we must leave the flight around for post-handshake retransmission. if (ssl->d1->flight_has_reply) { dtls_clear_outgoing_messages(ssl); } } static bool dtls1_set_read_state(SSL *ssl, ssl_encryption_level_t level, UniquePtr aead_ctx, Span secret_for_quic) { assert(secret_for_quic.empty()); // QUIC does not use DTLS. // Cipher changes are forbidden if the current epoch has leftover data. if (dtls_has_unprocessed_handshake_data(ssl)) { OPENSSL_PUT_ERROR(SSL, SSL_R_EXCESS_HANDSHAKE_DATA); ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); return false; } 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->s3->aead_read_ctx = std::move(aead_ctx); ssl->s3->read_level = level; ssl->d1->has_change_cipher_spec = false; return true; } static bool dtls1_set_write_state(SSL *ssl, ssl_encryption_level_t level, UniquePtr aead_ctx, Span secret_for_quic) { assert(secret_for_quic.empty()); // QUIC does not use DTLS. 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->d1->last_aead_write_ctx = std::move(ssl->s3->aead_write_ctx); ssl->s3->aead_write_ctx = std::move(aead_ctx); ssl->s3->write_level = level; return true; } static const SSL_PROTOCOL_METHOD kDTLSProtocolMethod = { true /* is_dtls */, dtls1_new, dtls1_free, dtls1_get_message, dtls1_next_message, dtls_has_unprocessed_handshake_data, dtls1_open_handshake, dtls1_open_change_cipher_spec, dtls1_open_app_data, dtls1_write_app_data, dtls1_dispatch_alert, dtls1_init_message, dtls1_finish_message, dtls1_add_message, dtls1_add_change_cipher_spec, dtls1_flush_flight, dtls1_on_handshake_complete, 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; } const SSL_METHOD *DTLS_with_buffers_method(void) { static const SSL_METHOD kMethod = { 0, &kDTLSProtocolMethod, &ssl_noop_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(); }