1 /* 2 * chap.h - Cryptographic Handshake Authentication Protocol definitions. 3 * 4 * Copyright (c) 1991 Gregory M. Christy 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 author. 13 * 14 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 16 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 17 * 18 * $Id: chap.h,v 1.1.1.1 1995/10/18 08:47:58 deraadt Exp $ 19 */ 20 21 #ifndef __CHAP_INCLUDE__ 22 23 /* Code + ID + length */ 24 #define CHAP_HEADERLEN 4 25 26 /* 27 * CHAP codes. 28 */ 29 30 #define CHAP_DIGEST_MD5 5 /* use MD5 algorithm */ 31 #define MD5_SIGNATURE_SIZE 16 /* 16 bytes in a MD5 message digest */ 32 33 #define CHAP_CHALLENGE 1 34 #define CHAP_RESPONSE 2 35 #define CHAP_SUCCESS 3 36 #define CHAP_FAILURE 4 37 38 /* 39 * Challenge lengths (for challenges we send) and other limits. 40 */ 41 #define MIN_CHALLENGE_LENGTH 32 42 #define MAX_CHALLENGE_LENGTH 64 43 #define MAX_RESPONSE_LENGTH 16 /* sufficient for MD5 */ 44 45 /* 46 * Each interface is described by a chap structure. 47 */ 48 49 typedef struct chap_state { 50 int unit; /* Interface unit number */ 51 int clientstate; /* Client state */ 52 int serverstate; /* Server state */ 53 u_char challenge[MAX_CHALLENGE_LENGTH]; /* last challenge string sent */ 54 u_char chal_len; /* challenge length */ 55 u_char chal_id; /* ID of last challenge */ 56 u_char chal_type; /* hash algorithm for challenges */ 57 u_char id; /* Current id */ 58 char *chal_name; /* Our name to use with challenge */ 59 int chal_interval; /* Time until we challenge peer again */ 60 int timeouttime; /* Timeout time in seconds */ 61 int max_transmits; /* Maximum # of challenge transmissions */ 62 int chal_transmits; /* Number of transmissions of challenge */ 63 int resp_transmits; /* Number of transmissions of response */ 64 u_char response[MAX_RESPONSE_LENGTH]; /* Response to send */ 65 u_char resp_length; /* length of response */ 66 u_char resp_id; /* ID for response messages */ 67 u_char resp_type; /* hash algorithm for responses */ 68 char *resp_name; /* Our name to send with response */ 69 } chap_state; 70 71 72 /* 73 * Client (peer) states. 74 */ 75 #define CHAPCS_INITIAL 0 /* Lower layer down, not opened */ 76 #define CHAPCS_CLOSED 1 /* Lower layer up, not opened */ 77 #define CHAPCS_PENDING 2 /* Auth us to peer when lower up */ 78 #define CHAPCS_LISTEN 3 /* Listening for a challenge */ 79 #define CHAPCS_RESPONSE 4 /* Sent response, waiting for status */ 80 #define CHAPCS_OPEN 5 /* We've received Success */ 81 82 /* 83 * Server (authenticator) states. 84 */ 85 #define CHAPSS_INITIAL 0 /* Lower layer down, not opened */ 86 #define CHAPSS_CLOSED 1 /* Lower layer up, not opened */ 87 #define CHAPSS_PENDING 2 /* Auth peer when lower up */ 88 #define CHAPSS_INITIAL_CHAL 3 /* We've sent the first challenge */ 89 #define CHAPSS_OPEN 4 /* We've sent a Success msg */ 90 #define CHAPSS_RECHALLENGE 5 /* We've sent another challenge */ 91 #define CHAPSS_BADAUTH 6 /* We've sent a Failure msg */ 92 93 /* 94 * Timeouts. 95 */ 96 #define CHAP_DEFTIMEOUT 3 /* Timeout time in seconds */ 97 #define CHAP_DEFTRANSMITS 10 /* max # times to send challenge */ 98 99 extern chap_state chap[]; 100 101 void ChapInit __P((int)); 102 void ChapAuthWithPeer __P((int, char *, int)); 103 void ChapAuthPeer __P((int, char *, int)); 104 void ChapLowerUp __P((int)); 105 void ChapLowerDown __P((int)); 106 void ChapInput __P((int, u_char *, int)); 107 void ChapProtocolReject __P((int)); 108 int ChapPrintPkt __P((u_char *, int, 109 void (*) __P((void *, char *, ...)), void *)); 110 111 #define __CHAP_INCLUDE__ 112 #endif /* __CHAP_INCLUDE__ */ 113