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authorcvs2svn <admin@example.com>2016-07-23 19:31:36 +0000
committercvs2svn <admin@example.com>2016-07-23 19:31:36 +0000
commit86c49b31af735796dfde37aa29473a30d36367db (patch)
treee9a354a92a348338fe2b361e2eda703cae23cfab /src/lib/libssl/dtls1.h
parent19d5fe348e8926bac4521c5807aa64c45b8f7a41 (diff)
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1/* $OpenBSD: dtls1.h,v 1.18 2015/09/10 17:57:50 jsing Exp $ */
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#ifndef HEADER_DTLS1_H
61#define HEADER_DTLS1_H
62
63#include <sys/time.h>
64
65#include <stdio.h>
66#include <stdlib.h>
67#include <string.h>
68
69#include <openssl/buffer.h>
70
71#ifdef __cplusplus
72extern "C" {
73#endif
74
75#define DTLS1_VERSION 0xFEFF
76
77/* lengths of messages */
78#define DTLS1_COOKIE_LENGTH 256
79
80#define DTLS1_RT_HEADER_LENGTH 13
81
82#define DTLS1_HM_HEADER_LENGTH 12
83
84#define DTLS1_HM_BAD_FRAGMENT -2
85#define DTLS1_HM_FRAGMENT_RETRY -3
86
87#define DTLS1_CCS_HEADER_LENGTH 1
88
89#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
90#define DTLS1_AL_HEADER_LENGTH 7
91#else
92#define DTLS1_AL_HEADER_LENGTH 2
93#endif
94
95#ifndef OPENSSL_NO_SSL_INTERN
96
97
98typedef struct dtls1_bitmap_st {
99 unsigned long map; /* track 32 packets on 32-bit systems
100 and 64 - on 64-bit systems */
101 unsigned char max_seq_num[8]; /* max record number seen so far,
102 64-bit value in big-endian
103 encoding */
104} DTLS1_BITMAP;
105
106struct dtls1_retransmit_state {
107 EVP_CIPHER_CTX *enc_write_ctx; /* cryptographic state */
108 EVP_MD_CTX *write_hash; /* used for mac generation */
109 SSL_SESSION *session;
110 unsigned short epoch;
111};
112
113struct hm_header_st {
114 unsigned char type;
115 unsigned long msg_len;
116 unsigned short seq;
117 unsigned long frag_off;
118 unsigned long frag_len;
119 unsigned int is_ccs;
120 struct dtls1_retransmit_state saved_retransmit_state;
121};
122
123struct ccs_header_st {
124 unsigned char type;
125 unsigned short seq;
126};
127
128struct dtls1_timeout_st {
129 /* Number of read timeouts so far */
130 unsigned int read_timeouts;
131
132 /* Number of write timeouts so far */
133 unsigned int write_timeouts;
134
135 /* Number of alerts received so far */
136 unsigned int num_alerts;
137};
138
139struct _pqueue;
140
141typedef struct record_pqueue_st {
142 unsigned short epoch;
143 struct _pqueue *q;
144} record_pqueue;
145
146typedef struct hm_fragment_st {
147 struct hm_header_st msg_header;
148 unsigned char *fragment;
149 unsigned char *reassembly;
150} hm_fragment;
151
152typedef struct dtls1_state_st {
153 unsigned int send_cookie;
154 unsigned char cookie[DTLS1_COOKIE_LENGTH];
155 unsigned char rcvd_cookie[DTLS1_COOKIE_LENGTH];
156 unsigned int cookie_len;
157
158 /*
159 * The current data and handshake epoch. This is initially
160 * undefined, and starts at zero once the initial handshake is
161 * completed
162 */
163 unsigned short r_epoch;
164 unsigned short w_epoch;
165
166 /* records being received in the current epoch */
167 DTLS1_BITMAP bitmap;
168
169 /* renegotiation starts a new set of sequence numbers */
170 DTLS1_BITMAP next_bitmap;
171
172 /* handshake message numbers */
173 unsigned short handshake_write_seq;
174 unsigned short next_handshake_write_seq;
175
176 unsigned short handshake_read_seq;
177
178 /* save last sequence number for retransmissions */
179 unsigned char last_write_sequence[8];
180
181 /* Received handshake records (processed and unprocessed) */
182 record_pqueue unprocessed_rcds;
183 record_pqueue processed_rcds;
184
185 /* Buffered handshake messages */
186 struct _pqueue *buffered_messages;
187
188 /* Buffered (sent) handshake records */
189 struct _pqueue *sent_messages;
190
191 /* Buffered application records.
192 * Only for records between CCS and Finished
193 * to prevent either protocol violation or
194 * unnecessary message loss.
195 */
196 record_pqueue buffered_app_data;
197
198 /* Is set when listening for new connections with dtls1_listen() */
199 unsigned int listen;
200
201 unsigned int mtu; /* max DTLS packet size */
202
203 struct hm_header_st w_msg_hdr;
204 struct hm_header_st r_msg_hdr;
205
206 struct dtls1_timeout_st timeout;
207
208 /* Indicates when the last handshake msg or heartbeat sent will timeout */
209 struct timeval next_timeout;
210
211 /* Timeout duration */
212 unsigned short timeout_duration;
213
214 /* storage for Alert/Handshake protocol data received but not
215 * yet processed by ssl3_read_bytes: */
216 unsigned char alert_fragment[DTLS1_AL_HEADER_LENGTH];
217 unsigned int alert_fragment_len;
218 unsigned char handshake_fragment[DTLS1_HM_HEADER_LENGTH];
219 unsigned int handshake_fragment_len;
220
221 unsigned int retransmitting;
222 unsigned int change_cipher_spec_ok;
223
224
225} DTLS1_STATE;
226
227typedef struct dtls1_record_data_st {
228 unsigned char *packet;
229 unsigned int packet_length;
230 SSL3_BUFFER rbuf;
231 SSL3_RECORD rrec;
232} DTLS1_RECORD_DATA;
233
234#endif
235
236/* Timeout multipliers (timeout slice is defined in apps/timeouts.h */
237#define DTLS1_TMO_READ_COUNT 2
238#define DTLS1_TMO_WRITE_COUNT 2
239
240#define DTLS1_TMO_ALERT_COUNT 12
241
242#ifdef __cplusplus
243}
244#endif
245#endif