113 lines
3.8 KiB
C
113 lines
3.8 KiB
C
/*
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* chap.h - Cryptographic Handshake Authentication Protocol definitions.
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*
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* Copyright (c) 1991 Gregory M. Christy
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the author.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id: chap.h,v 1.5 1995/07/04 23:47:37 paulus Exp $
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*/
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#ifndef __CHAP_INCLUDE__
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/* Code + ID + length */
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#define CHAP_HEADERLEN 4
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/*
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* CHAP codes.
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*/
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#define CHAP_DIGEST_MD5 5 /* use MD5 algorithm */
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#define MD5_SIGNATURE_SIZE 16 /* 16 bytes in a MD5 message digest */
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#define CHAP_CHALLENGE 1
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#define CHAP_RESPONSE 2
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#define CHAP_SUCCESS 3
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#define CHAP_FAILURE 4
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/*
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* Challenge lengths (for challenges we send) and other limits.
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*/
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#define MIN_CHALLENGE_LENGTH 32
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#define MAX_CHALLENGE_LENGTH 64
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#define MAX_RESPONSE_LENGTH 16 /* sufficient for MD5 */
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/*
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* Each interface is described by a chap structure.
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*/
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typedef struct chap_state {
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int unit; /* Interface unit number */
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int clientstate; /* Client state */
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int serverstate; /* Server state */
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u_char challenge[MAX_CHALLENGE_LENGTH]; /* last challenge string sent */
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u_char chal_len; /* challenge length */
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u_char chal_id; /* ID of last challenge */
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u_char chal_type; /* hash algorithm for challenges */
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u_char id; /* Current id */
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char *chal_name; /* Our name to use with challenge */
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int chal_interval; /* Time until we challenge peer again */
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int timeouttime; /* Timeout time in seconds */
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int max_transmits; /* Maximum # of challenge transmissions */
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int chal_transmits; /* Number of transmissions of challenge */
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int resp_transmits; /* Number of transmissions of response */
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u_char response[MAX_RESPONSE_LENGTH]; /* Response to send */
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u_char resp_length; /* length of response */
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u_char resp_id; /* ID for response messages */
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u_char resp_type; /* hash algorithm for responses */
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char *resp_name; /* Our name to send with response */
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} chap_state;
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/*
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* Client (peer) states.
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*/
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#define CHAPCS_INITIAL 0 /* Lower layer down, not opened */
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#define CHAPCS_CLOSED 1 /* Lower layer up, not opened */
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#define CHAPCS_PENDING 2 /* Auth us to peer when lower up */
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#define CHAPCS_LISTEN 3 /* Listening for a challenge */
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#define CHAPCS_RESPONSE 4 /* Sent response, waiting for status */
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#define CHAPCS_OPEN 5 /* We've received Success */
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/*
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* Server (authenticator) states.
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*/
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#define CHAPSS_INITIAL 0 /* Lower layer down, not opened */
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#define CHAPSS_CLOSED 1 /* Lower layer up, not opened */
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#define CHAPSS_PENDING 2 /* Auth peer when lower up */
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#define CHAPSS_INITIAL_CHAL 3 /* We've sent the first challenge */
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#define CHAPSS_OPEN 4 /* We've sent a Success msg */
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#define CHAPSS_RECHALLENGE 5 /* We've sent another challenge */
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#define CHAPSS_BADAUTH 6 /* We've sent a Failure msg */
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/*
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* Timeouts.
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*/
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#define CHAP_DEFTIMEOUT 3 /* Timeout time in seconds */
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#define CHAP_DEFTRANSMITS 10 /* max # times to send challenge */
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extern chap_state chap[];
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void ChapInit __P((int));
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void ChapAuthWithPeer __P((int, char *, int));
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void ChapAuthPeer __P((int, char *, int));
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void ChapLowerUp __P((int));
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void ChapLowerDown __P((int));
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void ChapInput __P((int, u_char *, int));
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void ChapProtocolReject __P((int));
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int ChapPrintPkt __P((u_char *, int,
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void (*) __P((void *, char *, ...)), void *));
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#define __CHAP_INCLUDE__
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#endif /* __CHAP_INCLUDE__ */
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