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//usr/include/pppd/chap-new.h
/* * chap-new.c - New CHAP implementation. * * Copyright (c) 2003 Paul Mackerras. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. The name(s) of the authors of this software must not be used to * endorse or promote products derived from this software without * prior written permission. * * 3. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by Paul Mackerras * <paulus@samba.org>". * * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /* * CHAP packets begin with a standard header with code, id, len (2 bytes). */ #define CHAP_HDRLEN 4 /* * Values for the code field. */ #define CHAP_CHALLENGE 1 #define CHAP_RESPONSE 2 #define CHAP_SUCCESS 3 #define CHAP_FAILURE 4 /* * CHAP digest codes. */ #define CHAP_MD5 5 #define CHAP_MICROSOFT 0x80 #define CHAP_MICROSOFT_V2 0x81 /* * Semi-arbitrary limits on challenge and response fields. */ #define MAX_CHALLENGE_LEN 64 #define MAX_RESPONSE_LEN 64 /* bitmask of supported algorithms */ #define MDTYPE_MICROSOFT_V2 0x1 #define MDTYPE_MICROSOFT 0x2 #define MDTYPE_MD5 0x4 #define MDTYPE_NONE 0 /* hashes supported by this instance of pppd */ extern int chap_mdtype_all; /* Return the digest alg. ID for the most preferred digest type. */ #define CHAP_DIGEST(mdtype) \ ((mdtype) & MDTYPE_MD5)? CHAP_MD5: \ ((mdtype) & MDTYPE_MICROSOFT_V2)? CHAP_MICROSOFT_V2: \ ((mdtype) & MDTYPE_MICROSOFT)? CHAP_MICROSOFT: \ 0 /* Return the bit flag (lsb set) for our most preferred digest type. */ #define CHAP_MDTYPE(mdtype) ((mdtype) ^ ((mdtype) - 1)) & (mdtype) /* Return the bit flag for a given digest algorithm ID. */ #define CHAP_MDTYPE_D(digest) \ ((digest) == CHAP_MICROSOFT_V2)? MDTYPE_MICROSOFT_V2: \ ((digest) == CHAP_MICROSOFT)? MDTYPE_MICROSOFT: \ ((digest) == CHAP_MD5)? MDTYPE_MD5: \ 0 /* Can we do the requested digest? */ #define CHAP_CANDIGEST(mdtype, digest) \ ((digest) == CHAP_MICROSOFT_V2)? (mdtype) & MDTYPE_MICROSOFT_V2: \ ((digest) == CHAP_MICROSOFT)? (mdtype) & MDTYPE_MICROSOFT: \ ((digest) == CHAP_MD5)? (mdtype) & MDTYPE_MD5: \ 0 /* * The code for each digest type has to supply one of these. */ struct chap_digest_type { int code; /* * Note: challenge and response arguments below are formatted as * a length byte followed by the actual challenge/response data. */ void (*generate_challenge)(unsigned char *challenge); int (*verify_response)(int id, char *name, unsigned char *secret, int secret_len, unsigned char *challenge, unsigned char *response, char *message, int message_space); void (*make_response)(unsigned char *response, int id, char *our_name, unsigned char *challenge, char *secret, int secret_len, unsigned char *priv); int (*check_success)(unsigned char *pkt, int len, unsigned char *priv); void (*handle_failure)(unsigned char *pkt, int len); struct chap_digest_type *next; }; /* Hook for a plugin to validate CHAP challenge */ extern int (*chap_verify_hook)(char *name, char *ourname, int id, struct chap_digest_type *digest, unsigned char *challenge, unsigned char *response, char *message, int message_space); /* Called by digest code to register a digest type */ extern void chap_register_digest(struct chap_digest_type *); /* Called by authentication code to start authenticating the peer. */ extern void chap_auth_peer(int unit, char *our_name, int digest_code); /* Called by auth. code to start authenticating us to the peer. */ extern void chap_auth_with_peer(int unit, char *our_name, int digest_code); /* Represents the CHAP protocol to the main pppd code */ extern struct protent chap_protent;