2 * chap.h - Challenge Handshake Authentication Protocol definitions.
4 * Copyright (c) 1993 The Australian National University.
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.
19 * Copyright (c) 1991 Gregory M. Christy
20 * All rights reserved.
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
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.
33 * $Id: chap.h,v 1.9 2002/01/22 16:02:58 dfs Exp $
36 #ifndef __CHAP_INCLUDE__
38 /* Code + ID + length */
39 #define CHAP_HEADERLEN 4
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 */
50 #define CHAP_CHALLENGE 1
51 #define CHAP_RESPONSE 2
52 #define CHAP_SUCCESS 3
53 #define CHAP_FAILURE 4
56 * Challenge lengths (for challenges we send) and other limits.
58 #define MIN_CHALLENGE_LENGTH 16
59 #define MAX_CHALLENGE_LENGTH 24
60 #define MAX_RESPONSE_LENGTH 64 /* sufficient for MD5 or MS-CHAP */
63 * Each interface is described by a chap structure.
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 */
88 /* We need the declaration of chap_state to use this prototype */
89 extern int (*chap_auth_hook) __P((char *user, u_char *remmd,
90 int remmd_len, chap_state *cstate));
93 * Client (peer) states.
95 #define CHAPCS_INITIAL 0 /* Lower layer down, not opened */
96 #define CHAPCS_CLOSED 1 /* Lower layer up, not opened */
97 #define CHAPCS_PENDING 2 /* Auth us to peer when lower up */
98 #define CHAPCS_LISTEN 3 /* Listening for a challenge */
99 #define CHAPCS_RESPONSE 4 /* Sent response, waiting for status */
100 #define CHAPCS_OPEN 5 /* We've received Success */
103 * Server (authenticator) states.
105 #define CHAPSS_INITIAL 0 /* Lower layer down, not opened */
106 #define CHAPSS_CLOSED 1 /* Lower layer up, not opened */
107 #define CHAPSS_PENDING 2 /* Auth peer when lower up */
108 #define CHAPSS_INITIAL_CHAL 3 /* We've sent the first challenge */
109 #define CHAPSS_OPEN 4 /* We've sent a Success msg */
110 #define CHAPSS_RECHALLENGE 5 /* We've sent another challenge */
111 #define CHAPSS_BADAUTH 6 /* We've sent a Failure msg */
116 #define CHAP_DEFTIMEOUT 3 /* Timeout time in seconds */
117 #define CHAP_DEFTRANSMITS 10 /* max # times to send challenge */
119 extern chap_state chap[];
121 void ChapAuthWithPeer __P((int, char *, int));
122 void ChapAuthPeer __P((int, char *, int));
124 extern struct protent chap_protent;
126 #define __CHAP_INCLUDE__
127 #endif /* __CHAP_INCLUDE__ */