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 * $Id$
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
66typedef 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
116extern chap_state chap[];
117
118void ChapAuthWithPeer __P((int, char *, int));
119void ChapAuthPeer __P((int, char *, int));
120
121extern struct protent chap_protent;
122
123#define __CHAP_INCLUDE__
124#endif /* __CHAP_INCLUDE__ */
125