1 /* 2 * DTLS implementation written by Nagendra Modadugu 3 * (nagendra (at) cs.stanford.edu) for the OpenSSL project 2005. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * openssl-core (at) OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay (at) cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh (at) cryptsoft.com). */ 56 57 #include <openssl/ssl.h> 58 59 #include <assert.h> 60 #include <string.h> 61 62 #include <openssl/buf.h> 63 #include <openssl/err.h> 64 65 #include "../crypto/internal.h" 66 #include "internal.h" 67 68 69 using namespace bssl; 70 71 static void dtls1_on_handshake_complete(SSL *ssl) { 72 // Stop the reply timer left by the last flight we sent. 73 dtls1_stop_timer(ssl); 74 // If the final flight had a reply, we know the peer has received it. If not, 75 // we must leave the flight around for post-handshake retransmission. 76 if (ssl->d1->flight_has_reply) { 77 dtls_clear_outgoing_messages(ssl); 78 } 79 } 80 81 static bool dtls1_set_read_state(SSL *ssl, UniquePtr<SSLAEADContext> aead_ctx) { 82 // Cipher changes are forbidden if the current epoch has leftover data. 83 if (dtls_has_unprocessed_handshake_data(ssl)) { 84 OPENSSL_PUT_ERROR(SSL, SSL_R_BUFFERED_MESSAGES_ON_CIPHER_CHANGE); 85 ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 86 return false; 87 } 88 89 ssl->d1->r_epoch++; 90 OPENSSL_memset(&ssl->d1->bitmap, 0, sizeof(ssl->d1->bitmap)); 91 OPENSSL_memset(ssl->s3->read_sequence, 0, sizeof(ssl->s3->read_sequence)); 92 93 ssl->s3->aead_read_ctx = std::move(aead_ctx); 94 return true; 95 } 96 97 static bool dtls1_set_write_state(SSL *ssl, 98 UniquePtr<SSLAEADContext> aead_ctx) { 99 ssl->d1->w_epoch++; 100 OPENSSL_memcpy(ssl->d1->last_write_sequence, ssl->s3->write_sequence, 101 sizeof(ssl->s3->write_sequence)); 102 OPENSSL_memset(ssl->s3->write_sequence, 0, sizeof(ssl->s3->write_sequence)); 103 104 ssl->d1->last_aead_write_ctx = std::move(ssl->s3->aead_write_ctx); 105 ssl->s3->aead_write_ctx = std::move(aead_ctx); 106 return true; 107 } 108 109 static const SSL_PROTOCOL_METHOD kDTLSProtocolMethod = { 110 true /* is_dtls */, 111 dtls1_new, 112 dtls1_free, 113 dtls1_get_message, 114 dtls1_next_message, 115 dtls1_open_handshake, 116 dtls1_open_change_cipher_spec, 117 dtls1_open_app_data, 118 dtls1_write_app_data, 119 dtls1_dispatch_alert, 120 dtls1_init_message, 121 dtls1_finish_message, 122 dtls1_add_message, 123 dtls1_add_change_cipher_spec, 124 dtls1_add_alert, 125 dtls1_flush_flight, 126 dtls1_on_handshake_complete, 127 dtls1_set_read_state, 128 dtls1_set_write_state, 129 }; 130 131 const SSL_METHOD *DTLS_method(void) { 132 static const SSL_METHOD kMethod = { 133 0, 134 &kDTLSProtocolMethod, 135 &ssl_crypto_x509_method, 136 }; 137 return &kMethod; 138 } 139 140 const SSL_METHOD *DTLS_with_buffers_method(void) { 141 static const SSL_METHOD kMethod = { 142 0, 143 &kDTLSProtocolMethod, 144 &ssl_noop_x509_method, 145 }; 146 return &kMethod; 147 } 148 149 // Legacy version-locked methods. 150 151 const SSL_METHOD *DTLSv1_2_method(void) { 152 static const SSL_METHOD kMethod = { 153 DTLS1_2_VERSION, 154 &kDTLSProtocolMethod, 155 &ssl_crypto_x509_method, 156 }; 157 return &kMethod; 158 } 159 160 const SSL_METHOD *DTLSv1_method(void) { 161 static const SSL_METHOD kMethod = { 162 DTLS1_VERSION, 163 &kDTLSProtocolMethod, 164 &ssl_crypto_x509_method, 165 }; 166 return &kMethod; 167 } 168 169 // Legacy side-specific methods. 170 171 const SSL_METHOD *DTLSv1_2_server_method(void) { 172 return DTLSv1_2_method(); 173 } 174 175 const SSL_METHOD *DTLSv1_server_method(void) { 176 return DTLSv1_method(); 177 } 178 179 const SSL_METHOD *DTLSv1_2_client_method(void) { 180 return DTLSv1_2_method(); 181 } 182 183 const SSL_METHOD *DTLSv1_client_method(void) { 184 return DTLSv1_method(); 185 } 186 187 const SSL_METHOD *DTLS_server_method(void) { 188 return DTLS_method(); 189 } 190 191 const SSL_METHOD *DTLS_client_method(void) { 192 return DTLS_method(); 193 } 194