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176 lines
5.5 KiB
176 lines
5.5 KiB
/*
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* Copyright (C) 2007-2009 Sourcefire, Inc.
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*
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* Authors: Tomasz Kojm
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#ifndef __MATCHER_H
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#define __MATCHER_H
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#include <sys/types.h>
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#include "clamav.h"
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#include "filetypes.h"
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#include "others.h"
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#include "execs.h"
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#include "cltypes.h"
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struct cli_target_info {
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off_t fsize;
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struct cli_exe_info exeinfo;
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int status; /* 0 == not initialised, 1 == initialised OK, -1 == error */
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};
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#include "matcher-ac.h"
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#include "matcher-bm.h"
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#include "matcher-hash.h"
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#include "fmap.h"
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#include "mpool.h"
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#define CLI_MATCH_WILDCARD 0xff00
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#define CLI_MATCH_CHAR 0x0000
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#define CLI_MATCH_IGNORE 0x0100
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#define CLI_MATCH_SPECIAL 0x0200
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#define CLI_MATCH_NIBBLE_HIGH 0x0300
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#define CLI_MATCH_NIBBLE_LOW 0x0400
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struct cli_lsig_tdb {
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#define CLI_TDB_UINT 0
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#define CLI_TDB_RANGE 1
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#define CLI_TDB_STR 2
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#define CLI_TDB_RANGE2 3
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#define CLI_TDB_FTYPE 4
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uint32_t *val, *range;
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char *str;
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uint32_t cnt[3];
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uint32_t subsigs;
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const uint32_t *target;
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const uint32_t *engine, *nos, *ep, *filesize;
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const uint32_t *container, *handlertype;
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/*
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const uint32_t *sectoff, *sectrva, *sectvsz, *sectraw, *sectrsz,
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*secturva, *sectuvsz, *secturaw, *sectursz;
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*/
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const char *icongrp1, *icongrp2;
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uint32_t *macro_ptids;
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#ifdef USE_MPOOL
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mpool_t *mempool;
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#endif
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};
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struct cli_bc;
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struct cli_ac_lsig {
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uint32_t id;
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unsigned bc_idx;
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char *logic;
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const char *virname;
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struct cli_lsig_tdb tdb;
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};
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struct cli_matcher {
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unsigned int type;
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/* Extended Boyer-Moore */
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uint8_t *bm_shift;
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struct cli_bm_patt **bm_suffix, **bm_pattab;
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uint32_t *soff, soff_len; /* for PE section sigs */
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uint32_t bm_offmode, bm_patterns, bm_reloff_num, bm_absoff_num;
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/* HASH */
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struct cli_hash_patt hm;
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/* Extended Aho-Corasick */
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uint32_t ac_partsigs, ac_nodes, ac_patterns, ac_lsigs;
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struct cli_ac_lsig **ac_lsigtable;
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struct cli_ac_node *ac_root, **ac_nodetable;
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struct cli_ac_patt **ac_pattable;
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struct cli_ac_patt **ac_reloff;
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uint32_t ac_reloff_num, ac_absoff_num;
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uint8_t ac_mindepth, ac_maxdepth;
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struct filter *filter;
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uint16_t maxpatlen;
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uint8_t ac_only;
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#ifdef USE_MPOOL
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mpool_t *mempool;
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#endif
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};
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struct cli_cdb
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{
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char *virname; /* virus name */
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cli_file_t ctype; /* container type */
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regex_t name; /* filename regex */
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size_t csize[2]; /* container size (min, max); if csize[0] != csize[1]
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* then value of 0 makes the field ignored
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*/
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size_t fsizec[2]; /* file size in container */
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size_t fsizer[2]; /* real file size */
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int encrypted; /* file is encrypted; 2 == ignore */
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int filepos[2]; /* file position in container */
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int res1; /* reserved / format specific */
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void *res2; /* reserved / format specific */
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struct cli_cdb *next;
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};
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struct cli_mtarget {
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cli_file_t target;
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const char *name;
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uint8_t idx; /* idx of matcher */
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uint8_t ac_only;
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uint8_t enable_prefiltering;
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};
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#define CLI_MTARGETS 10
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static const struct cli_mtarget cli_mtargets[CLI_MTARGETS] = {
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{ 0, "GENERIC", 0, 0, 1 },
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{ CL_TYPE_MSEXE, "PE", 1, 0, 1 },
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{ CL_TYPE_MSOLE2, "OLE2", 2, 1, 0 },
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{ CL_TYPE_HTML, "HTML", 3, 1, 0 },
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{ CL_TYPE_MAIL, "MAIL", 4, 1, 1 },
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{ CL_TYPE_GRAPHICS, "GRAPHICS", 5, 1, 0 },
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{ CL_TYPE_ELF, "ELF", 6, 1, 0 },
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{ CL_TYPE_TEXT_ASCII, "ASCII", 7, 1, 1 },
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{ CL_TYPE_ERROR, "NOT USED", 8, 1, 0 },
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{ CL_TYPE_MACHO, "MACH-O", 9, 1, 0 }
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};
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#define CLI_OFF_ANY 0xffffffff
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#define CLI_OFF_NONE 0xfffffffe
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#define CLI_OFF_ABSOLUTE 1
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#define CLI_OFF_EOF_MINUS 2
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#define CLI_OFF_EP_PLUS 3
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#define CLI_OFF_EP_MINUS 4
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#define CLI_OFF_SL_PLUS 5
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#define CLI_OFF_SX_PLUS 6
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#define CLI_OFF_VERSION 7
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#define CLI_OFF_MACRO 8
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int cli_scanbuff(const unsigned char *buffer, uint32_t length, uint32_t offset, cli_ctx *ctx, cli_file_t ftype, struct cli_ac_data **acdata);
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int cli_scandesc(int desc, cli_ctx *ctx, cli_file_t ftype, uint8_t ftonly, struct cli_matched_type **ftoffset, unsigned int acmode, struct cli_ac_result **acres);
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int cli_fmap_scandesc(cli_ctx *ctx, cli_file_t ftype, uint8_t ftonly, struct cli_matched_type **ftoffset, unsigned int acmode, struct cli_ac_result **acres, unsigned char *refhash);
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int cli_lsig_eval(cli_ctx *ctx, struct cli_matcher *root, struct cli_ac_data *acdata, struct cli_target_info *target_info, const char *hash);
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int cli_caloff(const char *offstr, const struct cli_target_info *info, unsigned int target, uint32_t *offdata, uint32_t *offset_min, uint32_t *offset_max);
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int cli_checkfp(unsigned char *digest, size_t size, cli_ctx *ctx);
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int cli_matchmeta(cli_ctx *ctx, const char *fname, size_t fsizec, size_t fsizer, int encrypted, unsigned int filepos, int res1, void *res2);
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#endif
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