xref: /minix/crypto/external/bsd/openssl/dist/ssl/dtls1.h (revision 0a6a1f1d)
1 /* ssl/dtls1.h */
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 <openssl/buffer.h>
64 # include <openssl/pqueue.h>
65 # ifdef OPENSSL_SYS_VMS
66 #  include <resource.h>
67 #  include <sys/timeb.h>
68 # endif
69 # ifdef OPENSSL_SYS_WIN32
70 /* Needed for struct timeval */
71 #  include <winsock.h>
72 # elif defined(OPENSSL_SYS_NETWARE) && !defined(_WINSOCK2API_)
73 #  include <sys/timeval.h>
74 # else
75 #  if defined(OPENSSL_SYS_VXWORKS)
76 #   include <sys/times.h>
77 #  else
78 #   include <sys/time.h>
79 #  endif
80 # endif
81 
82 #ifdef  __cplusplus
83 extern "C" {
84 #endif
85 
86 # define DTLS1_VERSION                   0xFEFF
87 # define DTLS_MAX_VERSION                DTLS1_VERSION
88 # define DTLS1_VERSION_MAJOR             0xFE
89 
90 # define DTLS1_BAD_VER                   0x0100
91 
92 # if 0
93 /* this alert description is not specified anywhere... */
94 #  define DTLS1_AD_MISSING_HANDSHAKE_MESSAGE    110
95 # endif
96 
97 /* lengths of messages */
98 # define DTLS1_COOKIE_LENGTH                     256
99 
100 # define DTLS1_RT_HEADER_LENGTH                  13
101 
102 # define DTLS1_HM_HEADER_LENGTH                  12
103 
104 # define DTLS1_HM_BAD_FRAGMENT                   -2
105 # define DTLS1_HM_FRAGMENT_RETRY                 -3
106 
107 # define DTLS1_CCS_HEADER_LENGTH                  1
108 
109 # ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
110 #  define DTLS1_AL_HEADER_LENGTH                   7
111 # else
112 #  define DTLS1_AL_HEADER_LENGTH                   2
113 # endif
114 
115 # ifndef OPENSSL_NO_SSL_INTERN
116 
117 #  ifndef OPENSSL_NO_SCTP
118 #   define DTLS1_SCTP_AUTH_LABEL   "EXPORTER_DTLS_OVER_SCTP"
119 #  endif
120 
121 /* Max MTU overhead we know about so far is 40 for IPv6 + 8 for UDP */
122 #  define DTLS1_MAX_MTU_OVERHEAD                   48
123 
124 typedef struct dtls1_bitmap_st {
125     unsigned long map;          /* track 32 packets on 32-bit systems and 64
126                                  * - on 64-bit systems */
127     unsigned char max_seq_num[8]; /* max record number seen so far, 64-bit
128                                    * value in big-endian encoding */
129 } DTLS1_BITMAP;
130 
131 struct dtls1_retransmit_state {
132     EVP_CIPHER_CTX *enc_write_ctx; /* cryptographic state */
133     EVP_MD_CTX *write_hash;     /* used for mac generation */
134 #  ifndef OPENSSL_NO_COMP
135     COMP_CTX *compress;         /* compression */
136 #  else
137     char *compress;
138 #  endif
139     SSL_SESSION *session;
140     unsigned short epoch;
141 };
142 
143 struct hm_header_st {
144     unsigned char type;
145     unsigned long msg_len;
146     unsigned short seq;
147     unsigned long frag_off;
148     unsigned long frag_len;
149     unsigned int is_ccs;
150     struct dtls1_retransmit_state saved_retransmit_state;
151 };
152 
153 struct ccs_header_st {
154     unsigned char type;
155     unsigned short seq;
156 };
157 
158 struct dtls1_timeout_st {
159     /* Number of read timeouts so far */
160     unsigned int read_timeouts;
161     /* Number of write timeouts so far */
162     unsigned int write_timeouts;
163     /* Number of alerts received so far */
164     unsigned int num_alerts;
165 };
166 
167 typedef struct record_pqueue_st {
168     unsigned short epoch;
169     pqueue q;
170 } record_pqueue;
171 
172 typedef struct hm_fragment_st {
173     struct hm_header_st msg_header;
174     unsigned char *fragment;
175     unsigned char *reassembly;
176 } hm_fragment;
177 
178 typedef struct dtls1_state_st {
179     unsigned int send_cookie;
180     unsigned char cookie[DTLS1_COOKIE_LENGTH];
181     unsigned char rcvd_cookie[DTLS1_COOKIE_LENGTH];
182     unsigned int cookie_len;
183     /*
184      * The current data and handshake epoch.  This is initially
185      * undefined, and starts at zero once the initial handshake is
186      * completed
187      */
188     unsigned short r_epoch;
189     unsigned short w_epoch;
190     /* records being received in the current epoch */
191     DTLS1_BITMAP bitmap;
192     /* renegotiation starts a new set of sequence numbers */
193     DTLS1_BITMAP next_bitmap;
194     /* handshake message numbers */
195     unsigned short handshake_write_seq;
196     unsigned short next_handshake_write_seq;
197     unsigned short handshake_read_seq;
198     /* save last sequence number for retransmissions */
199     unsigned char last_write_sequence[8];
200     /* Received handshake records (processed and unprocessed) */
201     record_pqueue unprocessed_rcds;
202     record_pqueue processed_rcds;
203     /* Buffered handshake messages */
204     pqueue buffered_messages;
205     /* Buffered (sent) handshake records */
206     pqueue sent_messages;
207     /*
208      * Buffered application records. Only for records between CCS and
209      * Finished to prevent either protocol violation or unnecessary message
210      * loss.
211      */
212     record_pqueue buffered_app_data;
213     /* Is set when listening for new connections with dtls1_listen() */
214     unsigned int listen;
215     unsigned int link_mtu;      /* max on-the-wire DTLS packet size */
216     unsigned int mtu;           /* max DTLS packet size */
217     struct hm_header_st w_msg_hdr;
218     struct hm_header_st r_msg_hdr;
219     struct dtls1_timeout_st timeout;
220     /*
221      * Indicates when the last handshake msg or heartbeat sent will timeout
222      */
223     struct timeval next_timeout;
224     /* Timeout duration */
225     unsigned short timeout_duration;
226     /*
227      * storage for Alert/Handshake protocol data received but not yet
228      * processed by ssl3_read_bytes:
229      */
230     unsigned char alert_fragment[DTLS1_AL_HEADER_LENGTH];
231     unsigned int alert_fragment_len;
232     unsigned char handshake_fragment[DTLS1_HM_HEADER_LENGTH];
233     unsigned int handshake_fragment_len;
234     unsigned int retransmitting;
235     /*
236      * Set when the handshake is ready to process peer's ChangeCipherSpec message.
237      * Cleared after the message has been processed.
238      */
239     unsigned int change_cipher_spec_ok;
240 #  ifndef OPENSSL_NO_SCTP
241     /* used when SSL_ST_XX_FLUSH is entered */
242     int next_state;
243     int shutdown_received;
244 #  endif
245 } DTLS1_STATE;
246 
247 typedef struct dtls1_record_data_st {
248     unsigned char *packet;
249     unsigned int packet_length;
250     SSL3_BUFFER rbuf;
251     SSL3_RECORD rrec;
252 #  ifndef OPENSSL_NO_SCTP
253     struct bio_dgram_sctp_rcvinfo recordinfo;
254 #  endif
255 } DTLS1_RECORD_DATA;
256 
257 # endif
258 
259 /* Timeout multipliers (timeout slice is defined in apps/timeouts.h */
260 # define DTLS1_TMO_READ_COUNT                      2
261 # define DTLS1_TMO_WRITE_COUNT                     2
262 
263 # define DTLS1_TMO_ALERT_COUNT                     12
264 
265 #ifdef  __cplusplus
266 }
267 #endif
268 #endif
269