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/*
* Copyright (C) 2009 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
/**
* @defgroup integrity_checker integrity_checker
* @{ @ingroup utils
*/
#ifndef INTEGRITY_CHECKER_H_
#define INTEGRITY_CHECKER_H_
#include "utils.h"
typedef struct integrity_checker_t integrity_checker_t;
typedef struct integrity_checksum_t integrity_checksum_t;
/**
* Struct to hold a precalculated checksum, implemented in the checksum library.
*/
struct integrity_checksum_t {
/* name of the checksum */
char *name;
/* size in bytes of the file on disk */
size_t file_len;
/* checksum of the file on disk */
uint32_t file;
/* size in bytes of executable segment in memory */
size_t segment_len;
/* checksum of the executable segment in memory */
uint32_t segment;
};
/**
* Code integrity checker to detect non-malicious file manipulation.
*
* The integrity checker reads the checksums from a separate library
* libchecksum.so to compare the checksums.
*/
struct integrity_checker_t {
/**
* Check the integrity of a file on disk.
*
* @param name name to lookup checksum
* @param file path to file
* @return TRUE if integrity tested successfully
*/
bool (*check_file)(integrity_checker_t *this, char *name, char *file);
/**
* Build the integrity checksum of a file on disk.
*
* @param file path to file
* @param len return length in bytes of file
* @return checksum, 0 on error
*/
uint32_t (*build_file)(integrity_checker_t *this, char *file, size_t *len);
/**
* Check the integrity of the code segment in memory.
*
* @param name name to lookup checksum
* @param sym a symbol in the segment to check
* @return TRUE if integrity tested successfully
*/
bool (*check_segment)(integrity_checker_t *this, char *name, void *sym);
/**
* Build the integrity checksum of a code segment in memory.
*
* @param sym a symbol in the segment to check
* @param len return length in bytes of code segment in memory
* @return checksum, 0 on error
*/
uint32_t (*build_segment)(integrity_checker_t *this, void *sym, size_t *len);
/**
* Check both, on disk file integrity and loaded segment.
*
* @param name name to lookup checksum
* @param sym a symbol to look up library and segment
* @return TRUE if integrity tested successfully
*/
bool (*check)(integrity_checker_t *this, char *name, void *sym);
/**
* Destroy a integrity_checker_t.
*/
void (*destroy)(integrity_checker_t *this);
};
/**
* Create a integrity_checker instance.
*
* @param checksum_library library containing checksums
*/
integrity_checker_t *integrity_checker_create(char *checksum_library);
#endif /** INTEGRITY_CHECKER_H_ @}*/
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