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