168 lines
6.5 KiB
C
168 lines
6.5 KiB
C
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/*****************************************************************************
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* chap.h - Network Challenge Handshake Authentication Protocol header file.
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*
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* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
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* portions Copyright (c) 1998 Global Election Systems Inc.
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice and the following disclaimer are included verbatim in any
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* distributions. No written agreement, license, or royalty fee is required
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* for any of the authorized uses.
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*
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* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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* REVISION HISTORY
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*
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* 03-01-01 Marc Boucher <marc@mbsi.ca>
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* Ported to lwIP.
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* 97-12-03 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
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* Original built from BSD network code.
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******************************************************************************/
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/*
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* chap.h - Challenge Handshake Authentication Protocol definitions.
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*
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* Copyright (c) 1993 The Australian National University.
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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 Australian National University. The name of the University
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* may not be used to endorse or promote products derived from this
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* software without specific prior written permission.
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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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* 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 1.1 2003/05/27 14:37:56 jani Exp $
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*/
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#ifndef CHAP_H
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#define CHAP_H
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/*************************
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*** PUBLIC DEFINITIONS ***
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*************************/
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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_MICROSOFT 0x80 /* use Microsoft-compatible alg. */
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#define MS_CHAP_RESPONSE_LEN 49 /* Response length for MS-CHAP */
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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 64 /* sufficient for MD5 or MS-CHAP */
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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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*** PUBLIC DATA TYPES ***
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************************/
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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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*** PUBLIC DATA ***
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******************/
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extern chap_state chap[];
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extern struct protent chap_protent;
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/***********************
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*** PUBLIC FUNCTIONS ***
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***********************/
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void ChapAuthWithPeer (int, char *, int);
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void ChapAuthPeer (int, char *, int);
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#endif /* CHAP_H */
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