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//==========================================================================

//

//      include/chap.h

//

//==========================================================================

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//==========================================================================

/*

 * chap.h - Challenge Handshake Authentication Protocol definitions.

 *

 * Copyright (c) 1993 The Australian National University.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms are permitted

 * provided that the above copyright notice and this paragraph are

 * duplicated in all such forms and that any documentation,

 * advertising materials, and other materials related to such

 * distribution and use acknowledge that the software was developed

 * by the Australian National University.  The name of the University

 * may not be used to endorse or promote products derived from this

 * software without specific prior written permission.

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED

 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 *

 * Copyright (c) 1991 Gregory M. Christy

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms are permitted

 * provided that the above copyright notice and this paragraph are

 * duplicated in all such forms and that any documentation,

 * advertising materials, and other materials related to such

 * distribution and use acknowledge that the software was developed

 * by the author.

 *

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED

 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 *

 * $FreeBSD: src/usr.sbin/pppd/chap.h,v 1.7 1999/08/28 01:19:01 peter Exp $

 */

#ifndef __CHAP_INCLUDE__

/* Code + ID + length */

#define CHAP_HEADERLEN          4

/*

 * CHAP codes.

 */

#define CHAP_DIGEST_MD5         5       /* use MD5 algorithm */

#define MD5_SIGNATURE_SIZE      16      /* 16 bytes in a MD5 message digest */

#define CHAP_MICROSOFT          0x80    /* use Microsoft-compatible alg. */

#define MS_CHAP_RESPONSE_LEN    49      /* Response length for MS-CHAP */

#define CHAP_CHALLENGE          1

#define CHAP_RESPONSE           2

#define CHAP_SUCCESS            3

#define CHAP_FAILURE            4

/*

 *  Challenge lengths (for challenges we send) and other limits.

 */

#define MIN_CHALLENGE_LENGTH    32

#define MAX_CHALLENGE_LENGTH    64

#define MAX_RESPONSE_LENGTH     64      /* sufficient for MD5 or MS-CHAP */

/*

 * Each interface is described by a chap structure.

 */

typedef struct chap_state {

    int unit;                   /* Interface unit number */

    int clientstate;            /* Client state */

    int serverstate;            /* Server state */

    u_char challenge[MAX_CHALLENGE_LENGTH]; /* last challenge string sent */

    u_char chal_len;            /* challenge length */

    u_char chal_id;             /* ID of last challenge */

    u_char chal_type;           /* hash algorithm for challenges */

    u_char id;                  /* Current id */

    char *chal_name;            /* Our name to use with challenge */

    int chal_interval;          /* Time until we challenge peer again */

    int timeouttime;            /* Timeout time in seconds */

    int max_transmits;          /* Maximum # of challenge transmissions */

    int chal_transmits;         /* Number of transmissions of challenge */

    int resp_transmits;         /* Number of transmissions of response */

    u_char response[MAX_RESPONSE_LENGTH];       /* Response to send */

    u_char resp_length;         /* length of response */

    u_char resp_id;             /* ID for response messages */

    u_char resp_type;           /* hash algorithm for responses */

    char *resp_name;            /* Our name to send with response */

} chap_state;

/*

 * Client (peer) states.

 */

#define CHAPCS_INITIAL          0        /* Lower layer down, not opened */

#define CHAPCS_CLOSED           1       /* Lower layer up, not opened */

#define CHAPCS_PENDING          2       /* Auth us to peer when lower up */

#define CHAPCS_LISTEN           3       /* Listening for a challenge */

#define CHAPCS_RESPONSE         4       /* Sent response, waiting for status */

#define CHAPCS_OPEN             5       /* We've received Success */

/*

 * Server (authenticator) states.

 */

#define CHAPSS_INITIAL          0        /* Lower layer down, not opened */

#define CHAPSS_CLOSED           1       /* Lower layer up, not opened */

#define CHAPSS_PENDING          2       /* Auth peer when lower up */

#define CHAPSS_INITIAL_CHAL     3       /* We've sent the first challenge */

#define CHAPSS_OPEN             4       /* We've sent a Success msg */

#define CHAPSS_RECHALLENGE      5       /* We've sent another challenge */

#define CHAPSS_BADAUTH          6       /* We've sent a Failure msg */

/*

 * Timeouts.

 */

#define CHAP_DEFTIMEOUT         3       /* Timeout time in seconds */

#define CHAP_DEFTRANSMITS       10      /* max # times to send challenge */

extern chap_state chap[];

void ChapAuthWithPeer __P((int, char *, int));

void ChapAuthPeer __P((int, char *, int));

extern struct protent chap_protent;

#define __CHAP_INCLUDE__

#endif /* __CHAP_INCLUDE__ */