mirror of https://github.com/Cisco-Talos/clamav
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
222 lines
7.5 KiB
222 lines
7.5 KiB
/*
|
|
* Copyright (C) 2015, 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
|
|
* Copyright (C) 2007-2013 Sourcefire, Inc.
|
|
*
|
|
* Authors: Tomasz Kojm
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
|
|
* MA 02110-1301, USA.
|
|
*/
|
|
|
|
#ifndef __MATCHER_H
|
|
#define __MATCHER_H
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include "clamav.h"
|
|
#include "filetypes.h"
|
|
#include "others.h"
|
|
#include "execs.h"
|
|
#include "cltypes.h"
|
|
|
|
struct cli_target_info {
|
|
off_t fsize;
|
|
struct cli_exe_info exeinfo;
|
|
int status; /* 0 == not initialised, 1 == initialised OK, -1 == error */
|
|
};
|
|
|
|
#include "matcher-ac.h"
|
|
#include "matcher-bm.h"
|
|
#include "matcher-hash.h"
|
|
#include "matcher-pcre.h"
|
|
#include "matcher-byte-comp.h"
|
|
#include "regex_pcre.h"
|
|
#include "fmap.h"
|
|
#include "mpool.h"
|
|
|
|
#define CLI_MATCH_METADATA 0xff00
|
|
#define CLI_MATCH_WILDCARD 0x0f00
|
|
#define CLI_MATCH_CHAR 0x0000
|
|
#define CLI_MATCH_NOCASE 0x1000
|
|
#define CLI_MATCH_IGNORE 0x0100
|
|
#define CLI_MATCH_SPECIAL 0x0200
|
|
#define CLI_MATCH_NIBBLE_HIGH 0x0300
|
|
#define CLI_MATCH_NIBBLE_LOW 0x0400
|
|
|
|
struct cli_lsig_tdb {
|
|
#define CLI_TDB_UINT 0
|
|
#define CLI_TDB_RANGE 1
|
|
#define CLI_TDB_STR 2
|
|
#define CLI_TDB_RANGE2 3
|
|
#define CLI_TDB_FTYPE 4
|
|
#define CLI_TDB_FTYPE_EXPR 5
|
|
uint32_t *val, *range;
|
|
char *str;
|
|
uint32_t cnt[3];
|
|
uint32_t subsigs;
|
|
|
|
const uint32_t *target;
|
|
const uint32_t *engine, *nos, *ep, *filesize;
|
|
const uint32_t *container, *handlertype;
|
|
const uint32_t *intermediates;
|
|
/*
|
|
const uint32_t *sectoff, *sectrva, *sectvsz, *sectraw, *sectrsz,
|
|
*secturva, *sectuvsz, *secturaw, *sectursz;
|
|
*/
|
|
const char *icongrp1, *icongrp2;
|
|
uint32_t *macro_ptids;
|
|
#ifdef USE_MPOOL
|
|
mpool_t *mempool;
|
|
#endif
|
|
};
|
|
|
|
#define CLI_LSIG_FLAG_PRIVATE 0x01
|
|
|
|
struct cli_bc;
|
|
struct cli_ac_lsig {
|
|
#define CLI_LSIG_NORMAL 0
|
|
#define CLI_YARA_NORMAL 1
|
|
#define CLI_YARA_OFFSET 2
|
|
uint32_t id;
|
|
unsigned bc_idx;
|
|
uint8_t type;
|
|
uint8_t flag;
|
|
union {
|
|
char *logic;
|
|
uint8_t *code_start;
|
|
} u;
|
|
const char *virname;
|
|
struct cli_lsig_tdb tdb;
|
|
};
|
|
|
|
struct cli_matcher {
|
|
unsigned int type;
|
|
|
|
/* Extended Boyer-Moore */
|
|
uint8_t *bm_shift;
|
|
struct cli_bm_patt **bm_suffix, **bm_pattab;
|
|
uint32_t *soff, soff_len; /* for PE section sigs */
|
|
uint32_t bm_offmode, bm_patterns, bm_reloff_num, bm_absoff_num;
|
|
|
|
/* HASH */
|
|
struct cli_hash_patt hm;
|
|
struct cli_hash_wild hwild;
|
|
|
|
/* Extended Aho-Corasick */
|
|
uint32_t ac_partsigs, ac_nodes, ac_lists, ac_patterns, ac_lsigs;
|
|
struct cli_ac_lsig **ac_lsigtable;
|
|
struct cli_ac_node *ac_root, **ac_nodetable;
|
|
struct cli_ac_list **ac_listtable;
|
|
struct cli_ac_patt **ac_pattable;
|
|
struct cli_ac_patt **ac_reloff;
|
|
uint32_t ac_reloff_num, ac_absoff_num;
|
|
uint8_t ac_mindepth, ac_maxdepth;
|
|
struct filter *filter;
|
|
|
|
uint16_t maxpatlen;
|
|
uint8_t ac_only;
|
|
|
|
/* Perl-Compiled Regular Expressions */
|
|
#if HAVE_PCRE
|
|
uint32_t pcre_metas;
|
|
struct cli_pcre_meta **pcre_metatable;
|
|
uint32_t pcre_reloff_num, pcre_absoff_num;
|
|
#endif
|
|
|
|
/* Byte Compare */
|
|
uint32_t bcomp_metas;
|
|
struct cli_bcomp_meta **bcomp_metatable;
|
|
|
|
/* Bytecode Tracker */
|
|
uint32_t linked_bcs;
|
|
|
|
#ifdef USE_MPOOL
|
|
mpool_t *mempool;
|
|
#endif
|
|
};
|
|
|
|
struct cli_cdb
|
|
{
|
|
char *virname; /* virus name */
|
|
cli_file_t ctype; /* container type */
|
|
regex_t name; /* filename regex */
|
|
size_t csize[2]; /* container size (min, max); if csize[0] != csize[1]
|
|
* then value of 0 makes the field ignored
|
|
*/
|
|
size_t fsizec[2]; /* file size in container */
|
|
size_t fsizer[2]; /* real file size */
|
|
int encrypted; /* file is encrypted; 2 == ignore */
|
|
unsigned int filepos[2]; /* file position in container */
|
|
int res1; /* reserved / format specific */
|
|
void *res2; /* reserved / format specific */
|
|
|
|
struct cli_cdb *next;
|
|
};
|
|
|
|
#define CLI_MAX_TARGETS 2 /* maximum filetypes for a specific target */
|
|
struct cli_mtarget {
|
|
cli_file_t target[CLI_MAX_TARGETS];
|
|
const char *name;
|
|
uint8_t idx; /* idx of matcher */
|
|
uint8_t ac_only;
|
|
uint8_t enable_prefiltering;
|
|
uint8_t target_count; /* must be synced with non-zero values in the target array */
|
|
};
|
|
|
|
#define CLI_MTARGETS 15
|
|
static const struct cli_mtarget cli_mtargets[CLI_MTARGETS] = {
|
|
{ {0, 0}, "GENERIC", 0, 0, 1, 1 },
|
|
{ {CL_TYPE_MSEXE, 0}, "PE", 1, 0, 1, 1 },
|
|
{ {CL_TYPE_MSOLE2, 0}, "OLE2", 2, 1, 0, 1 },
|
|
{ {CL_TYPE_HTML, 0}, "HTML", 3, 1, 0, 1 },
|
|
{ {CL_TYPE_MAIL, 0}, "MAIL", 4, 1, 1, 1 },
|
|
{ {CL_TYPE_GRAPHICS, 0}, "GRAPHICS", 5, 1, 0, 1 },
|
|
{ {CL_TYPE_ELF, 0}, "ELF", 6, 1, 0, 1 },
|
|
{ {CL_TYPE_TEXT_ASCII, 0}, "ASCII", 7, 1, 1, 1 },
|
|
{ {CL_TYPE_ERROR, 0}, "NOT USED", 8, 1, 0, 1 },
|
|
{ {CL_TYPE_MACHO, CL_TYPE_MACHO_UNIBIN}, "MACH-O", 9, 1, 0, 2 },
|
|
{ {CL_TYPE_PDF, 0}, "PDF", 10, 1, 0, 1 },
|
|
{ {CL_TYPE_SWF, 0}, "FLASH", 11, 1, 0, 1 },
|
|
{ {CL_TYPE_JAVA, 0}, "JAVA", 12, 1, 0, 1 },
|
|
{ {CL_TYPE_INTERNAL, 0}, "INTERNAL", 13, 1, 0, 1 },
|
|
{ {CL_TYPE_OTHER, 0}, "OTHER", 14, 1, 0, 1 }
|
|
};
|
|
|
|
#define CLI_OFF_ANY 0xffffffff
|
|
#define CLI_OFF_NONE 0xfffffffe
|
|
#define CLI_OFF_ABSOLUTE 1
|
|
#define CLI_OFF_EOF_MINUS 2
|
|
#define CLI_OFF_EP_PLUS 3
|
|
#define CLI_OFF_EP_MINUS 4
|
|
#define CLI_OFF_SL_PLUS 5
|
|
#define CLI_OFF_SX_PLUS 6
|
|
#define CLI_OFF_VERSION 7
|
|
#define CLI_OFF_MACRO 8
|
|
#define CLI_OFF_SE 9
|
|
|
|
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);
|
|
|
|
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);
|
|
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);
|
|
int cli_exp_eval(cli_ctx *ctx, struct cli_matcher *root, struct cli_ac_data *acdata, struct cli_target_info *target_info, const char *hash);
|
|
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);
|
|
|
|
int cli_checkfp(unsigned char *digest, size_t size, cli_ctx *ctx);
|
|
int cli_checkfp_virus(unsigned char *digest, size_t size, cli_ctx *ctx, const char * vname);
|
|
|
|
int cli_matchmeta(cli_ctx *ctx, const char *fname, size_t fsizec, size_t fsizer, int encrypted, unsigned int filepos, int res1, void *res2);
|
|
|
|
void cli_targetinfo(struct cli_target_info *info, unsigned int target, fmap_t *map);
|
|
|
|
#endif
|
|
|