107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
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/*
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* chap.h - Cryptographic Handshake Authentication Protocol definitions.
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* based on November 1991 draft of PPP Authentication RFC
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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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#ifndef __CHAP_INCLUDE__
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/* Code + ID + length */
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#define CHAP_HEADERLEN (sizeof (u_char) + sizeof (u_char) + sizeof (u_short))
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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_NOCALLBACK 0 /* don't call back after successful auth */
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#define CHAP_CALLBACK 1 /* do call back */
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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
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*/
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#define MIN_CHALLENGE_LENGTH 64
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#define MAX_CHALLENGE_LENGTH 128
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#define MAX_SECRET_LEN 128
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/*
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* Each interface is described by 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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u_char chal_str[MAX_CHALLENGE_LENGTH + 1]; /* challenge string */
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u_char chal_len; /* challenge length */
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int clientstate; /* Client state */
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int serverstate; /* Server state */
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int flags; /* Flags */
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unsigned char id; /* Current id */
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int timeouttime; /* Timeout time in milliseconds */
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int retransmits; /* Number of retransmissions */
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} chap_state;
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/*
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* Client states.
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*/
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#define CHAPCS_CLOSED 1 /* Connection down */
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#define CHAPCS_CHALLENGE_SENT 2 /* We've sent a challenge */
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#define CHAPCS_OPEN 3 /* We've received an Ack */
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/*
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* Server states.
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*/
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#define CHAPSS_CLOSED 1 /* Connection down */
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#define CHAPSS_LISTEN 2 /* Listening for a challenge */
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#define CHAPSS_OPEN 3 /* We've sent an Ack */
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/*
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* Flags.
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*/
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#define CHAPF_LOWERUP 0x01 /* The lower level is UP */
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#define CHAPF_AWPPENDING 0x02 /* Auth with peer pending */
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#define CHAPF_APPENDING 0x04 /* Auth peer pending */
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#define CHAPF_UPVALID 0x08 /* values valid */
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#define CHAPF_UPPENDING 0x10 /* values pending */
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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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extern chap_state chap[];
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void ChapInit __ARGS((int));
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void ChapAuthWithPeer __ARGS((int));
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void ChapAuthPeer __ARGS((int));
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void ChapLowerUp __ARGS((int));
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void ChapLowerDown __ARGS((int));
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void ChapInput __ARGS((int, u_char *, int));
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void ChapProtocolReject __ARGS((int));
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#define __CHAP_INCLUDE__
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#endif /* __CHAP_INCLUDE__ */
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