ssl/dtls1.h

   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
  89 #define DTLS1_BAD_VER                   0x0100
  90
  91 #if 0
  92 /* this alert description is not specified anywhere... */
  93 #define DTLS1_AD_MISSING_HANDSHAKE_MESSAGE    110
  94 #endif
  95
  96 /* lengths of messages */
  97 #define DTLS1_COOKIE_LENGTH                     256
  98
  99 #define DTLS1_RT_HEADER_LENGTH                  13
 100
 101 #define DTLS1_HM_HEADER_LENGTH                  12
 102
 103 #define DTLS1_HM_BAD_FRAGMENT                   -2
 104 #define DTLS1_HM_FRAGMENT_RETRY                 -3
 105
 106 #define DTLS1_CCS_HEADER_LENGTH                  1
 107
 108 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
 109 #define DTLS1_AL_HEADER_LENGTH                   7
 110 #else
 111 #define DTLS1_AL_HEADER_LENGTH                   2
 112 #endif
 113
 114 #ifndef OPENSSL_NO_SSL_INTERN
 115
 116 #ifndef OPENSSL_NO_SCTP
 117 #define DTLS1_SCTP_AUTH_LABEL   "EXPORTER_DTLS_OVER_SCTP"
 118 #endif
 119
 120 typedef struct dtls1_bitmap_st
 121         {
 122         unsigned long map;              /* track 32 packets on 32-bit systems
 123                                            and 64 - on 64-bit systems */
 124         unsigned char max_seq_num[8];   /* max record number seen so far,
 125                                            64-bit value in big-endian
 126                                            encoding */
 127         } DTLS1_BITMAP;
 128
 129 struct dtls1_retransmit_state
 130         {
 131         EVP_CIPHER_CTX *enc_write_ctx;  /* cryptographic state */
 132         EVP_MD_CTX *write_hash;                 /* used for mac generation */
 133 #ifndef OPENSSL_NO_COMP
 134         COMP_CTX *compress;                             /* compression */
 135 #else
 136         char *compress;
 137 #endif
 138         SSL_SESSION *session;
 139         unsigned short epoch;
 140         };
 141
 142 struct hm_header_st
 143         {
 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         {
 155         unsigned char type;
 156         unsigned short seq;
 157         };
 158
 159 struct dtls1_timeout_st
 160         {
 161         /* Number of read timeouts so far */
 162         unsigned int read_timeouts;
 163
 164         /* Number of write timeouts so far */
 165         unsigned int write_timeouts;
 166
 167         /* Number of alerts received so far */
 168         unsigned int num_alerts;
 169         };
 170
 171 typedef struct record_pqueue_st
 172         {
 173         unsigned short epoch;
 174         pqueue q;
 175         } record_pqueue;
 176
 177 typedef struct hm_fragment_st
 178         {
 179         struct hm_header_st msg_header;
 180         unsigned char *fragment;
 181         unsigned char *reassembly;
 182         } hm_fragment;
 183
 184 typedef struct dtls1_state_st
 185         {
 186         unsigned int send_cookie;
 187         unsigned char cookie[DTLS1_COOKIE_LENGTH];
 188         unsigned char rcvd_cookie[DTLS1_COOKIE_LENGTH];
 189         unsigned int cookie_len;
 190
 191         /*
 192          * The current data and handshake epoch.  This is initially
 193          * undefined, and starts at zero once the initial handshake is
 194          * completed
 195          */
 196         unsigned short r_epoch;
 197         unsigned short w_epoch;
 198
 199         /* records being received in the current epoch */
 200         DTLS1_BITMAP bitmap;
 201
 202         /* renegotiation starts a new set of sequence numbers */
 203         DTLS1_BITMAP next_bitmap;
 204
 205         /* handshake message numbers */
 206         unsigned short handshake_write_seq;
 207         unsigned short next_handshake_write_seq;
 208
 209         unsigned short handshake_read_seq;
 210
 211         /* save last sequence number for retransmissions */
 212         unsigned char last_write_sequence[8];
 213
 214         /* Received handshake records (processed and unprocessed) */
 215         record_pqueue unprocessed_rcds;
 216         record_pqueue processed_rcds;
 217
 218         /* Buffered handshake messages */
 219         pqueue buffered_messages;
 220
 221         /* Buffered (sent) handshake records */
 222         pqueue sent_messages;
 223
 224         /* Buffered application records.
 225          * Only for records between CCS and Finished
 226          * to prevent either protocol violation or
 227          * unnecessary message loss.
 228          */
 229         record_pqueue buffered_app_data;
 230
 231         /* Is set when listening for new connections with dtls1_listen() */
 232         unsigned int listen;
 233
 234         unsigned int mtu; /* max DTLS packet size */
 235
 236         struct hm_header_st w_msg_hdr;
 237         struct hm_header_st r_msg_hdr;
 238
 239         struct dtls1_timeout_st timeout;
 240
 241         /* Indicates when the last handshake msg or heartbeat sent will timeout */
 242         struct timeval next_timeout;
 243
 244         /* Timeout duration */
 245         unsigned short timeout_duration;
 246
 247         /* storage for Alert/Handshake protocol data received but not
 248          * yet processed by ssl3_read_bytes: */
 249         unsigned char alert_fragment[DTLS1_AL_HEADER_LENGTH];
 250         unsigned int alert_fragment_len;
 251         unsigned char handshake_fragment[DTLS1_HM_HEADER_LENGTH];
 252         unsigned int handshake_fragment_len;
 253
 254         unsigned int retransmitting;
 255         unsigned int change_cipher_spec_ok;
 256
 257 #ifndef OPENSSL_NO_SCTP
 258         /* used when SSL_ST_XX_FLUSH is entered */
 259         int next_state;
 260
 261         int shutdown_received;
 262 #endif
 263
 264         } DTLS1_STATE;
 265
 266 typedef struct dtls1_record_data_st
 267         {
 268         unsigned char *packet;
 269         unsigned int   packet_length;
 270         SSL3_BUFFER    rbuf;
 271         SSL3_RECORD    rrec;
 272 #ifndef OPENSSL_NO_SCTP
 273         struct bio_dgram_sctp_rcvinfo recordinfo;
 274 #endif
 275         } DTLS1_RECORD_DATA;
 276
 277 #endif
 278
 279 /* Timeout multipliers (timeout slice is defined in apps/timeouts.h */
 280 #define DTLS1_TMO_READ_COUNT                      2
 281 #define DTLS1_TMO_WRITE_COUNT                     2
 282
 283 #define DTLS1_TMO_ALERT_COUNT                     12
 284
 285 #ifdef  __cplusplus
 286 }
 287 #endif
 288 #endif