Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1 | /* |
| 2 | * DTLS implementation written by Nagendra Modadugu |
Robert Sloan | ab8b888 | 2018-03-26 11:39:51 -0700 | [diff] [blame^] | 3 | * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 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@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@cryptsoft.com). This product includes software written by Tim |
| 55 | * Hudson (tjh@cryptsoft.com). */ |
| 56 | |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 57 | #include <openssl/ssl.h> |
| 58 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 59 | #include <assert.h> |
| 60 | #include <string.h> |
| 61 | |
| 62 | #include <openssl/buf.h> |
| 63 | #include <openssl/err.h> |
| 64 | |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 65 | #include "../crypto/internal.h" |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 66 | #include "internal.h" |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 67 | |
| 68 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 69 | using namespace bssl; |
| 70 | |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 71 | static void dtls1_on_handshake_complete(SSL *ssl) { |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 72 | // Stop the reply timer left by the last flight we sent. |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 73 | dtls1_stop_timer(ssl); |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 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. |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 76 | if (ssl->d1->flight_has_reply) { |
| 77 | dtls_clear_outgoing_messages(ssl); |
| 78 | } |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 79 | } |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 80 | |
Robert Sloan | 3627296 | 2017-10-23 10:28:39 -0700 | [diff] [blame] | 81 | static bool dtls1_set_read_state(SSL *ssl, UniquePtr<SSLAEADContext> aead_ctx) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 82 | // Cipher changes are forbidden if the current epoch has leftover data. |
| 83 | if (dtls_has_unprocessed_handshake_data(ssl)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 84 | OPENSSL_PUT_ERROR(SSL, SSL_R_BUFFERED_MESSAGES_ON_CIPHER_CHANGE); |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 85 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); |
Robert Sloan | 3627296 | 2017-10-23 10:28:39 -0700 | [diff] [blame] | 86 | return false; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 87 | } |
| 88 | |
| 89 | ssl->d1->r_epoch++; |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 90 | OPENSSL_memset(&ssl->d1->bitmap, 0, sizeof(ssl->d1->bitmap)); |
| 91 | OPENSSL_memset(ssl->s3->read_sequence, 0, sizeof(ssl->s3->read_sequence)); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 92 | |
Robert Sloan | 29c1d2c | 2017-10-30 14:10:28 -0700 | [diff] [blame] | 93 | ssl->s3->aead_read_ctx = std::move(aead_ctx); |
Robert Sloan | 3627296 | 2017-10-23 10:28:39 -0700 | [diff] [blame] | 94 | return true; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 95 | } |
| 96 | |
Robert Sloan | 3627296 | 2017-10-23 10:28:39 -0700 | [diff] [blame] | 97 | static bool dtls1_set_write_state(SSL *ssl, |
| 98 | UniquePtr<SSLAEADContext> aead_ctx) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 99 | ssl->d1->w_epoch++; |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 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)); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 103 | |
Robert Sloan | 29c1d2c | 2017-10-30 14:10:28 -0700 | [diff] [blame] | 104 | ssl->d1->last_aead_write_ctx = std::move(ssl->s3->aead_write_ctx); |
| 105 | ssl->s3->aead_write_ctx = std::move(aead_ctx); |
Robert Sloan | 3627296 | 2017-10-23 10:28:39 -0700 | [diff] [blame] | 106 | return true; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | static const SSL_PROTOCOL_METHOD kDTLSProtocolMethod = { |
Robert Sloan | 3627296 | 2017-10-23 10:28:39 -0700 | [diff] [blame] | 110 | true /* is_dtls */, |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 111 | dtls1_new, |
| 112 | dtls1_free, |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 113 | dtls1_get_message, |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 114 | dtls1_next_message, |
Robert Sloan | 3627296 | 2017-10-23 10:28:39 -0700 | [diff] [blame] | 115 | dtls1_open_handshake, |
| 116 | dtls1_open_change_cipher_spec, |
| 117 | dtls1_open_app_data, |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 118 | dtls1_write_app_data, |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 119 | dtls1_dispatch_alert, |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 120 | dtls1_init_message, |
| 121 | dtls1_finish_message, |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 122 | dtls1_add_message, |
| 123 | dtls1_add_change_cipher_spec, |
| 124 | dtls1_add_alert, |
David Benjamin | f31229b | 2017-01-25 14:08:15 -0500 | [diff] [blame] | 125 | dtls1_flush_flight, |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 126 | dtls1_on_handshake_complete, |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 127 | dtls1_set_read_state, |
| 128 | dtls1_set_write_state, |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 129 | }; |
| 130 | |
| 131 | const SSL_METHOD *DTLS_method(void) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 132 | static const SSL_METHOD kMethod = { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 133 | 0, |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 134 | &kDTLSProtocolMethod, |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 135 | &ssl_crypto_x509_method, |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 136 | }; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 137 | return &kMethod; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 138 | } |
| 139 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 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 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 149 | // Legacy version-locked methods. |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 150 | |
| 151 | const SSL_METHOD *DTLSv1_2_method(void) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 152 | static const SSL_METHOD kMethod = { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 153 | DTLS1_2_VERSION, |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 154 | &kDTLSProtocolMethod, |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 155 | &ssl_crypto_x509_method, |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 156 | }; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 157 | return &kMethod; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 158 | } |
| 159 | |
| 160 | const SSL_METHOD *DTLSv1_method(void) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 161 | static const SSL_METHOD kMethod = { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 162 | DTLS1_VERSION, |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 163 | &kDTLSProtocolMethod, |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 164 | &ssl_crypto_x509_method, |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 165 | }; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 166 | return &kMethod; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 167 | } |
| 168 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 169 | // Legacy side-specific methods. |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 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 | } |