1 /* ssl/d1_lib.c */
2 /*
3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
5 */
6 /* ====================================================================
7 * Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * openssl-core@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59
60 #include <stdio.h>
61 #include <openssl/objects.h>
62 #include "ssl_locl.h"
63
64 const char dtls1_version_str[]="DTLSv1" OPENSSL_VERSION_PTEXT;
65
66 SSL3_ENC_METHOD DTLSv1_enc_data={
67 dtls1_enc,
68 tls1_mac,
69 tls1_setup_key_block,
70 tls1_generate_master_secret,
71 tls1_change_cipher_state,
72 tls1_final_finish_mac,
73 TLS1_FINISH_MAC_LENGTH,
74 tls1_cert_verify_mac,
75 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
76 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
77 tls1_alert_code,
78 };
79
dtls1_default_timeout(void)80 long dtls1_default_timeout(void)
81 {
82 /* 2 hours, the 24 hours mentioned in the DTLSv1 spec
83 * is way too long for http, the cache would over fill */
84 return(60*60*2);
85 }
86
IMPLEMENT_dtls1_meth_func(dtlsv1_base_method,ssl_undefined_function,ssl_undefined_function,ssl_bad_method)87 IMPLEMENT_dtls1_meth_func(dtlsv1_base_method,
88 ssl_undefined_function,
89 ssl_undefined_function,
90 ssl_bad_method)
91
92 int dtls1_new(SSL *s)
93 {
94 DTLS1_STATE *d1;
95
96 if (!ssl3_new(s)) return(0);
97 if ((d1=OPENSSL_malloc(sizeof *d1)) == NULL) return (0);
98 memset(d1,0, sizeof *d1);
99
100 /* d1->handshake_epoch=0; */
101 #if defined(OPENSSL_SYS_VMS) || defined(VMS_TEST)
102 d1->bitmap.length=64;
103 #else
104 d1->bitmap.length=sizeof(d1->bitmap.map) * 8;
105 #endif
106 pq_64bit_init(&(d1->bitmap.map));
107 pq_64bit_init(&(d1->bitmap.max_seq_num));
108
109 pq_64bit_init(&(d1->next_bitmap.map));
110 pq_64bit_init(&(d1->next_bitmap.max_seq_num));
111
112 d1->unprocessed_rcds.q=pqueue_new();
113 d1->processed_rcds.q=pqueue_new();
114 d1->buffered_messages = pqueue_new();
115 d1->sent_messages=pqueue_new();
116
117 if ( s->server)
118 {
119 d1->cookie_len = sizeof(s->d1->cookie);
120 }
121
122 if( ! d1->unprocessed_rcds.q || ! d1->processed_rcds.q
123 || ! d1->buffered_messages || ! d1->sent_messages)
124 {
125 if ( d1->unprocessed_rcds.q) pqueue_free(d1->unprocessed_rcds.q);
126 if ( d1->processed_rcds.q) pqueue_free(d1->processed_rcds.q);
127 if ( d1->buffered_messages) pqueue_free(d1->buffered_messages);
128 if ( d1->sent_messages) pqueue_free(d1->sent_messages);
129 OPENSSL_free(d1);
130 return (0);
131 }
132
133 s->d1=d1;
134 s->method->ssl_clear(s);
135 return(1);
136 }
137
dtls1_free(SSL * s)138 void dtls1_free(SSL *s)
139 {
140 pitem *item = NULL;
141 hm_fragment *frag = NULL;
142
143 ssl3_free(s);
144
145 while( (item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL)
146 {
147 OPENSSL_free(item->data);
148 pitem_free(item);
149 }
150 pqueue_free(s->d1->unprocessed_rcds.q);
151
152 while( (item = pqueue_pop(s->d1->processed_rcds.q)) != NULL)
153 {
154 OPENSSL_free(item->data);
155 pitem_free(item);
156 }
157 pqueue_free(s->d1->processed_rcds.q);
158
159 while( (item = pqueue_pop(s->d1->buffered_messages)) != NULL)
160 {
161 frag = (hm_fragment *)item->data;
162 OPENSSL_free(frag->fragment);
163 OPENSSL_free(frag);
164 pitem_free(item);
165 }
166 pqueue_free(s->d1->buffered_messages);
167
168 while ( (item = pqueue_pop(s->d1->sent_messages)) != NULL)
169 {
170 frag = (hm_fragment *)item->data;
171 OPENSSL_free(frag->fragment);
172 OPENSSL_free(frag);
173 pitem_free(item);
174 }
175 pqueue_free(s->d1->sent_messages);
176
177 pq_64bit_free(&(s->d1->bitmap.map));
178 pq_64bit_free(&(s->d1->bitmap.max_seq_num));
179
180 pq_64bit_free(&(s->d1->next_bitmap.map));
181 pq_64bit_free(&(s->d1->next_bitmap.max_seq_num));
182
183 OPENSSL_free(s->d1);
184 }
185
dtls1_clear(SSL * s)186 void dtls1_clear(SSL *s)
187 {
188 ssl3_clear(s);
189 s->version=DTLS1_VERSION;
190 }
191
192 /*
193 * As it's impossible to use stream ciphers in "datagram" mode, this
194 * simple filter is designed to disengage them in DTLS. Unfortunately
195 * there is no universal way to identify stream SSL_CIPHER, so we have
196 * to explicitly list their SSL_* codes. Currently RC4 is the only one
197 * available, but if new ones emerge, they will have to be added...
198 */
dtls1_get_cipher(unsigned int u)199 SSL_CIPHER *dtls1_get_cipher(unsigned int u)
200 {
201 SSL_CIPHER *ciph = ssl3_get_cipher(u);
202
203 if (ciph != NULL)
204 {
205 if ((ciph->algorithms&SSL_ENC_MASK) == SSL_RC4)
206 return NULL;
207 }
208
209 return ciph;
210 }
211