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 DTLS1_2_VERSION                 0xFEFD
  88 # define DTLS_MAX_VERSION                DTLS1_2_VERSION
  89
  90 # define DTLS1_BAD_VER                   0x0100
  91
  92 /* Special value for method supporting multiple versions */
  93 # define DTLS_ANY_VERSION                0x1FFFF
  94
  95 /* lengths of messages */
  96 # define DTLS1_COOKIE_LENGTH                     256
  97
  98 # define DTLS1_RT_HEADER_LENGTH                  13
  99
 100 # define DTLS1_HM_HEADER_LENGTH                  12
 101
 102 # define DTLS1_HM_BAD_FRAGMENT                   -2
 103 # define DTLS1_HM_FRAGMENT_RETRY                 -3
 104
 105 # define DTLS1_CCS_HEADER_LENGTH                  1
 106
 107 # ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
 108 #  define DTLS1_AL_HEADER_LENGTH                   7
 109 # else
 110 #  define DTLS1_AL_HEADER_LENGTH                   2
 111 # endif
 112
 113 # ifndef OPENSSL_NO_SSL_INTERN
 114
 115 #  ifndef OPENSSL_NO_SCTP
 116 #   define DTLS1_SCTP_AUTH_LABEL   "EXPORTER_DTLS_OVER_SCTP"
 117 #  endif
 118
 119 /* Max MTU overhead we know about so far is 40 for IPv6 + 8 for UDP */
 120 #  define DTLS1_MAX_MTU_OVERHEAD                   48
 121
 122 typedef struct dtls1_bitmap_st {
 123     unsigned long map;          /* track 32 packets on 32-bit systems and 64
 124                                  * - on 64-bit systems */
 125     unsigned char max_seq_num[8]; /* max record number seen so far, 64-bit
 126                                    * value in big-endian encoding */
 127 } DTLS1_BITMAP;
 128
 129 struct dtls1_retransmit_state {
 130     EVP_CIPHER_CTX *enc_write_ctx; /* cryptographic state */
 131     EVP_MD_CTX *write_hash;     /* used for mac generation */
 132 #  ifndef OPENSSL_NO_COMP
 133     COMP_CTX *compress;         /* compression */
 134 #  else
 135     char *compress;
 136 #  endif
 137     SSL_SESSION *session;
 138     unsigned short epoch;
 139 };
 140
 141 struct hm_header_st {
 142     unsigned char type;
 143     unsigned long msg_len;
 144     unsigned short seq;
 145     unsigned long frag_off;
 146     unsigned long frag_len;
 147     unsigned int is_ccs;
 148     struct dtls1_retransmit_state saved_retransmit_state;
 149 };
 150
 151 struct ccs_header_st {
 152     unsigned char type;
 153     unsigned short seq;
 154 };
 155
 156 struct dtls1_timeout_st {
 157     /* Number of read timeouts so far */
 158     unsigned int read_timeouts;
 159     /* Number of write timeouts so far */
 160     unsigned int write_timeouts;
 161     /* Number of alerts received so far */
 162     unsigned int num_alerts;
 163 };
 164
 165 typedef struct record_pqueue_st {
 166     unsigned short epoch;
 167     pqueue q;
 168 } record_pqueue;
 169
 170 typedef struct hm_fragment_st {
 171     struct hm_header_st msg_header;
 172     unsigned char *fragment;
 173     unsigned char *reassembly;
 174 } hm_fragment;
 175
 176 typedef struct dtls1_state_st {
 177     unsigned int send_cookie;
 178     unsigned char cookie[DTLS1_COOKIE_LENGTH];
 179     unsigned char rcvd_cookie[DTLS1_COOKIE_LENGTH];
 180     unsigned int cookie_len;
 181     /*
 182      * The current data and handshake epoch.  This is initially
 183      * undefined, and starts at zero once the initial handshake is
 184      * completed
 185      */
 186     unsigned short r_epoch;
 187     unsigned short w_epoch;
 188     /* records being received in the current epoch */
 189     DTLS1_BITMAP bitmap;
 190     /* renegotiation starts a new set of sequence numbers */
 191     DTLS1_BITMAP next_bitmap;
 192     /* handshake message numbers */
 193     unsigned short handshake_write_seq;
 194     unsigned short next_handshake_write_seq;
 195     unsigned short handshake_read_seq;
 196     /* save last sequence number for retransmissions */
 197     unsigned char last_write_sequence[8];
 198     /* Received handshake records (processed and unprocessed) */
 199     record_pqueue unprocessed_rcds;
 200     record_pqueue processed_rcds;
 201     /* Buffered handshake messages */
 202     pqueue buffered_messages;
 203     /* Buffered (sent) handshake records */
 204     pqueue sent_messages;
 205     /*
 206      * Buffered application records. Only for records between CCS and
 207      * Finished to prevent either protocol violation or unnecessary message
 208      * loss.
 209      */
 210     record_pqueue buffered_app_data;
 211     /* Is set when listening for new connections with dtls1_listen() */
 212     unsigned int listen;
 213     unsigned int link_mtu;      /* max on-the-wire DTLS packet size */
 214     unsigned int mtu;           /* max DTLS packet size */
 215     struct hm_header_st w_msg_hdr;
 216     struct hm_header_st r_msg_hdr;
 217     struct dtls1_timeout_st timeout;
 218     /*
 219      * Indicates when the last handshake msg or heartbeat sent will timeout
 220      */
 221     struct timeval next_timeout;
 222     /* Timeout duration */
 223     unsigned short timeout_duration;
 224     /*
 225      * storage for Alert/Handshake protocol data received but not yet
 226      * processed by ssl3_read_bytes:
 227      */
 228     unsigned char alert_fragment[DTLS1_AL_HEADER_LENGTH];
 229     unsigned int alert_fragment_len;
 230     unsigned char handshake_fragment[DTLS1_HM_HEADER_LENGTH];
 231     unsigned int handshake_fragment_len;
 232     unsigned int retransmitting;
 233     /*
 234      * Set when the handshake is ready to process peer's ChangeCipherSpec message.
 235      * Cleared after the message has been processed.
 236      */
 237     unsigned int change_cipher_spec_ok;
 238 #  ifndef OPENSSL_NO_SCTP
 239     /* used when SSL_ST_XX_FLUSH is entered */
 240     int next_state;
 241     int shutdown_received;
 242 #  endif
 243 } DTLS1_STATE;
 244
 245 typedef struct dtls1_record_data_st {
 246     unsigned char *packet;
 247     unsigned int packet_length;
 248     SSL3_BUFFER rbuf;
 249     SSL3_RECORD rrec;
 250 #  ifndef OPENSSL_NO_SCTP
 251     struct bio_dgram_sctp_rcvinfo recordinfo;
 252 #  endif
 253 } DTLS1_RECORD_DATA;
 254
 255 # endif
 256
 257 /* Timeout multipliers (timeout slice is defined in apps/timeouts.h */
 258 # define DTLS1_TMO_READ_COUNT                      2
 259 # define DTLS1_TMO_WRITE_COUNT                     2
 260
 261 # define DTLS1_TMO_ALERT_COUNT                     12
 262
 263 #ifdef  __cplusplus
 264 }
 265 #endif
 266 #endif