pppd/chap.h

   1 /*
   2  * chap.h - Challenge Handshake Authentication Protocol definitions.
   3  *
   4  * Copyright (c) 1993 The Australian National University.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms are permitted
   8  * provided that the above copyright notice and this paragraph are
   9  * duplicated in all such forms and that any documentation,
  10  * advertising materials, and other materials related to such
  11  * distribution and use acknowledge that the software was developed
  12  * by the Australian National University.  The name of the University
  13  * may not be used to endorse or promote products derived from this
  14  * software without specific prior written permission.
  15  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  17  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  18  *
  19  * Copyright (c) 1991 Gregory M. Christy
  20  * All rights reserved.
  21  *
  22  * Redistribution and use in source and binary forms are permitted
  23  * provided that the above copyright notice and this paragraph are
  24  * duplicated in all such forms and that any documentation,
  25  * advertising materials, and other materials related to such
  26  * distribution and use acknowledge that the software was developed
  27  * by the author.
  28  *
  29  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  30  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  31  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  32  *
  33  * $Id: chap.h,v 1.8 1999/11/15 01:44:41 paulus Exp $
  34  */
  35
  36 #ifndef __CHAP_INCLUDE__
  37
  38 /* Code + ID + length */
  39 #define CHAP_HEADERLEN          4
  40
  41 /*
  42  * CHAP codes.
  43  */
  44
  45 #define CHAP_DIGEST_MD5         5       /* use MD5 algorithm */
  46 #define MD5_SIGNATURE_SIZE      16      /* 16 bytes in a MD5 message digest */
  47 #define CHAP_MICROSOFT          0x80    /* use Microsoft-compatible alg. */
  48 #define MS_CHAP_RESPONSE_LEN    49      /* Response length for MS-CHAP */
  49
  50 #define CHAP_CHALLENGE          1
  51 #define CHAP_RESPONSE           2
  52 #define CHAP_SUCCESS            3
  53 #define CHAP_FAILURE            4
  54
  55 /*
  56  *  Challenge lengths (for challenges we send) and other limits.
  57  */
  58 #define MIN_CHALLENGE_LENGTH    16
  59 #define MAX_CHALLENGE_LENGTH    24
  60 #define MAX_RESPONSE_LENGTH     64      /* sufficient for MD5 or MS-CHAP */
  61
  62 /*
  63  * Each interface is described by a chap structure.
  64  */
  65
  66 typedef struct chap_state {
  67     int unit;                   /* Interface unit number */
  68     int clientstate;            /* Client state */
  69     int serverstate;            /* Server state */
  70     u_char challenge[MAX_CHALLENGE_LENGTH]; /* last challenge string sent */
  71     u_char chal_len;            /* challenge length */
  72     u_char chal_id;             /* ID of last challenge */
  73     u_char chal_type;           /* hash algorithm for challenges */
  74     u_char id;                  /* Current id */
  75     char *chal_name;            /* Our name to use with challenge */
  76     int chal_interval;          /* Time until we challenge peer again */
  77     int timeouttime;            /* Timeout time in seconds */
  78     int max_transmits;          /* Maximum # of challenge transmissions */
  79     int chal_transmits;         /* Number of transmissions of challenge */
  80     int resp_transmits;         /* Number of transmissions of response */
  81     u_char response[MAX_RESPONSE_LENGTH];       /* Response to send */
  82     u_char resp_length;         /* length of response */
  83     u_char resp_id;             /* ID for response messages */
  84     u_char resp_type;           /* hash algorithm for responses */
  85     char *resp_name;            /* Our name to send with response */
  86 } chap_state;
  87
  88
  89 /*
  90  * Client (peer) states.
  91  */
  92 #define CHAPCS_INITIAL          0       /* Lower layer down, not opened */
  93 #define CHAPCS_CLOSED           1       /* Lower layer up, not opened */
  94 #define CHAPCS_PENDING          2       /* Auth us to peer when lower up */
  95 #define CHAPCS_LISTEN           3       /* Listening for a challenge */
  96 #define CHAPCS_RESPONSE         4       /* Sent response, waiting for status */
  97 #define CHAPCS_OPEN             5       /* We've received Success */
  98
  99 /*
 100  * Server (authenticator) states.
 101  */
 102 #define CHAPSS_INITIAL          0       /* Lower layer down, not opened */
 103 #define CHAPSS_CLOSED           1       /* Lower layer up, not opened */
 104 #define CHAPSS_PENDING          2       /* Auth peer when lower up */
 105 #define CHAPSS_INITIAL_CHAL     3       /* We've sent the first challenge */
 106 #define CHAPSS_OPEN             4       /* We've sent a Success msg */
 107 #define CHAPSS_RECHALLENGE      5       /* We've sent another challenge */
 108 #define CHAPSS_BADAUTH          6       /* We've sent a Failure msg */
 109
 110 /*
 111  * Timeouts.
 112  */
 113 #define CHAP_DEFTIMEOUT         3       /* Timeout time in seconds */
 114 #define CHAP_DEFTRANSMITS       10      /* max # times to send challenge */
 115
 116 extern chap_state chap[];
 117
 118 void ChapAuthWithPeer __P((int, char *, int));
 119 void ChapAuthPeer __P((int, char *, int));
 120
 121 extern struct protent chap_protent;
 122
 123 #define __CHAP_INCLUDE__
 124 #endif /* __CHAP_INCLUDE__ */