1 /*
2 * DTLS implementation written by Nagendra Modadugu
3 * (nagendra@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@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
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
dtls1_on_handshake_complete(SSL * ssl)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
dtls1_set_read_state(SSL * ssl,UniquePtr<SSLAEADContext> aead_ctx)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
dtls1_set_write_state(SSL * ssl,UniquePtr<SSLAEADContext> aead_ctx)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
DTLS_method(void)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
DTLS_with_buffers_method(void)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
DTLSv1_2_method(void)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
DTLSv1_method(void)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
DTLSv1_2_server_method(void)171 const SSL_METHOD *DTLSv1_2_server_method(void) {
172 return DTLSv1_2_method();
173 }
174
DTLSv1_server_method(void)175 const SSL_METHOD *DTLSv1_server_method(void) {
176 return DTLSv1_method();
177 }
178
DTLSv1_2_client_method(void)179 const SSL_METHOD *DTLSv1_2_client_method(void) {
180 return DTLSv1_2_method();
181 }
182
DTLSv1_client_method(void)183 const SSL_METHOD *DTLSv1_client_method(void) {
184 return DTLSv1_method();
185 }
186
DTLS_server_method(void)187 const SSL_METHOD *DTLS_server_method(void) {
188 return DTLS_method();
189 }
190
DTLS_client_method(void)191 const SSL_METHOD *DTLS_client_method(void) {
192 return DTLS_method();
193 }
194