1 /* $OpenBSD: chap.h,v 1.5 1996/12/23 13:22:39 mickey Exp $ */ 2 3 /* 4 * chap.h - Challenge Handshake Authentication Protocol definitions. 5 * 6 * Copyright (c) 1993 The Australian National University. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms are permitted 10 * provided that the above copyright notice and this paragraph are 11 * duplicated in all such forms and that any documentation, 12 * advertising materials, and other materials related to such 13 * distribution and use acknowledge that the software was developed 14 * by the Australian National University. The name of the University 15 * may not be used to endorse or promote products derived from this 16 * software without specific prior written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 19 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 * 21 * Copyright (c) 1991 Gregory M. Christy 22 * All rights reserved. 23 * 24 * Redistribution and use in source and binary forms are permitted 25 * provided that the above copyright notice and this paragraph are 26 * duplicated in all such forms and that any documentation, 27 * advertising materials, and other materials related to such 28 * distribution and use acknowledge that the software was developed 29 * by the author. 30 * 31 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 32 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 33 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 34 */ 35 36 #ifndef __CHAP_INCLUDE__ 37 38 /* Code + ID + length */ 39 #define CHAP_HEADERLEN 4 40 41 /* 42 * CHAP codes. 43 */ 44 45 #define CHAP_DIGEST_MD5 5 /* use MD5 algorithm */ 46 #define MD5_SIGNATURE_SIZE 16 /* 16 bytes in a MD5 message digest */ 47 #define CHAP_MICROSOFT 0x80 /* use Microsoft-compatible alg. */ 48 #define MS_CHAP_RESPONSE_LEN 49 /* Response length for MS-CHAP */ 49 50 #define CHAP_CHALLENGE 1 51 #define CHAP_RESPONSE 2 52 #define CHAP_SUCCESS 3 53 #define CHAP_FAILURE 4 54 55 /* 56 * Challenge lengths (for challenges we send) and other limits. 57 */ 58 #define MIN_CHALLENGE_LENGTH 32 59 #define MAX_CHALLENGE_LENGTH 64 60 #define MAX_RESPONSE_LENGTH 64 /* sufficient for MD5 or MS-CHAP */ 61 62 /* 63 * Each interface is described by a chap structure. 64 */ 65 66 typedef struct chap_state { 67 int unit; /* Interface unit number */ 68 int clientstate; /* Client state */ 69 int serverstate; /* Server state */ 70 u_char challenge[MAX_CHALLENGE_LENGTH]; /* last challenge string sent */ 71 u_char chal_len; /* challenge length */ 72 u_char chal_id; /* ID of last challenge */ 73 u_char chal_type; /* hash algorithm for challenges */ 74 u_char id; /* Current id */ 75 char *chal_name; /* Our name to use with challenge */ 76 int chal_interval; /* Time until we challenge peer again */ 77 int timeouttime; /* Timeout time in seconds */ 78 int max_transmits; /* Maximum # of challenge transmissions */ 79 int chal_transmits; /* Number of transmissions of challenge */ 80 int resp_transmits; /* Number of transmissions of response */ 81 u_char response[MAX_RESPONSE_LENGTH]; /* Response to send */ 82 u_char resp_length; /* length of response */ 83 u_char resp_id; /* ID for response messages */ 84 u_char resp_type; /* hash algorithm for responses */ 85 char *resp_name; /* Our name to send with response */ 86 } chap_state; 87 88 89 /* 90 * Client (peer) states. 91 */ 92 #define CHAPCS_INITIAL 0 /* Lower layer down, not opened */ 93 #define CHAPCS_CLOSED 1 /* Lower layer up, not opened */ 94 #define CHAPCS_PENDING 2 /* Auth us to peer when lower up */ 95 #define CHAPCS_LISTEN 3 /* Listening for a challenge */ 96 #define CHAPCS_RESPONSE 4 /* Sent response, waiting for status */ 97 #define CHAPCS_OPEN 5 /* We've received Success */ 98 99 /* 100 * Server (authenticator) states. 101 */ 102 #define CHAPSS_INITIAL 0 /* Lower layer down, not opened */ 103 #define CHAPSS_CLOSED 1 /* Lower layer up, not opened */ 104 #define CHAPSS_PENDING 2 /* Auth peer when lower up */ 105 #define CHAPSS_INITIAL_CHAL 3 /* We've sent the first challenge */ 106 #define CHAPSS_OPEN 4 /* We've sent a Success msg */ 107 #define CHAPSS_RECHALLENGE 5 /* We've sent another challenge */ 108 #define CHAPSS_BADAUTH 6 /* We've sent a Failure msg */ 109 110 /* 111 * Timeouts. 112 */ 113 #define CHAP_DEFTIMEOUT 3 /* Timeout time in seconds */ 114 #define CHAP_DEFTRANSMITS 10 /* max # times to send challenge */ 115 116 extern chap_state chap[]; 117 118 void ChapAuthWithPeer __P((int, char *, int)); 119 void ChapAuthPeer __P((int, char *, int)); 120 121 extern struct protent chap_protent; 122 123 #define __CHAP_INCLUDE__ 124 #endif /* __CHAP_INCLUDE__ */ 125