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denyhosts/clamav/libclamav/readdb.c

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/*
* Copyright (C) 2013-2022 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
* Copyright (C) 2007-2013 Sourcefire, Inc.
* Copyright (C) 2002-2007 Tomasz Kojm <tkojm@clamav.net>
*
* 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.
*/
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#include <stdio.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include <fcntl.h>
#include <zlib.h>
#include <errno.h>
#ifdef _WIN32
#include "libgen.h"
#endif
#include "clamav.h"
#include "clamav_rust.h"
#include "cvd.h"
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#include "matcher-ac.h"
#include "matcher-bm.h"
#include "matcher-pcre.h"
#include "matcher-byte-comp.h"
#include "matcher-hash.h"
#include "matcher.h"
#include "others.h"
#include "str.h"
#include "dconf.h"
#include "filetypes.h"
#include "filetypes_int.h"
#include "readdb.h"
#include "default.h"
#include "dsig.h"
#include "asn1.h"
#include "phishcheck.h"
#include "phish_allow_list.h"
#include "phish_domaincheck_db.h"
#include "regex_list.h"
#include "hashtab.h"
#include "mpool.h"
#include "bytecode.h"
#include "bytecode_api.h"
#include "bytecode_priv.h"
#include "cache.h"
#include "openioc.h"
#ifdef CL_THREAD_SAFE
#include <pthread.h>
static pthread_mutex_t cli_ref_mutex = PTHREAD_MUTEX_INITIALIZER;
#endif
#ifdef HAVE_YARA
#include "yara_clam.h"
#include "yara_compiler.h"
#include "yara_grammar.h"
#include "yara_lexer.h"
#endif
#ifdef _WIN32
static char DATABASE_DIRECTORY[MAX_PATH] = "";
#endif
char *cli_virname(const char *virname, unsigned int official)
{
char *newname, *pt;
if (!virname)
return NULL;
if ((pt = strstr(virname, " (Clam)")))
*pt = '\0';
if (!virname[0]) {
cli_errmsg("cli_virname: Empty virus name\n");
return NULL;
}
if (official)
return cli_strdup(virname);
newname = (char *)cli_malloc(strlen(virname) + 11 + 1);
if (!newname) {
cli_errmsg("cli_virname: Can't allocate memory for newname\n");
return NULL;
}
sprintf(newname, "%s.UNOFFICIAL", virname);
return newname;
}
cl_error_t cli_sigopts_handler(struct cli_matcher *root, const char *virname, const char *hexsig,
uint8_t sigopts, uint16_t rtype, uint16_t type,
const char *offset, const uint32_t *lsigid, unsigned int options)
{
char *hexcpy, *start, *end, *mid;
unsigned int i;
int ret = CL_SUCCESS;
/*
* cyclic loops with cli_add_content_match_pattern are impossible now as cli_add_content_match_pattern
* no longer calls cli_sigopts_handler; leaving here for safety
*/
if (sigopts & ACPATT_OPTION_ONCE) {
cli_errmsg("cli_sigopts_handler: invalidly called multiple times!\n");
return CL_EPARSE;
}
hexcpy = cli_strdup(hexsig);
if (!hexcpy)
return CL_EMEM;
sigopts |= ACPATT_OPTION_ONCE;
/* REGEX testing and sigopt handling */
start = strchr(hexcpy, '/');
end = strrchr(hexcpy, '/');
if (start != end) {
/* FULLWORD regex sigopt handling */
if (sigopts & ACPATT_OPTION_FULLWORD) {
size_t ovrlen = strlen(hexcpy) + 21;
char *hexovr = cli_calloc(ovrlen, sizeof(char));
if (!hexovr) {
free(hexcpy);
return CL_EMEM;
}
*start++ = '\0';
*end++ = '\0';
snprintf(hexovr, ovrlen, "%s/([\\W_]|\\A)%s([\\W_]|\\Z)/%s", hexcpy, start, end);
free(hexcpy);
hexcpy = hexovr;
}
/* NOCASE sigopt is passed onto the regex-opt handler */
if (sigopts & ACPATT_OPTION_NOCASE) {
size_t ovrlen = strlen(hexcpy) + 2;
char *hexovr = cli_calloc(ovrlen, sizeof(char));
if (!hexovr) {
free(hexcpy);
return CL_EMEM;
}
snprintf(hexovr, ovrlen, "%si", hexcpy);
free(hexcpy);
hexcpy = hexovr;
}
/* WIDE sigopt is unsupported */
if (sigopts & ACPATT_OPTION_WIDE) {
cli_errmsg("cli_sigopts_handler: wide modifier [w] is not supported for regex subsigs\n");
free(hexcpy);
return CL_EMALFDB;
}
ret = cli_add_content_match_pattern(root, virname, hexcpy, sigopts, rtype, type, offset, lsigid, options);
free(hexcpy);
return ret;
}
/* BCOMP sigopt handling */
start = strchr(hexcpy, '#');
end = strrchr(hexcpy, '#');
mid = strchr(hexcpy, '(');
if (start != end && mid && (*(++mid) == '#' || !strncmp(mid, ">>", 2) || !strncmp(mid, "<<", 2) || !strncmp(mid, "0#", 2))) {
/* TODO byte compare currently does not have support for sigopts, pass through */
ret = cli_add_content_match_pattern(root, virname, hexcpy, sigopts, rtype, type, offset, lsigid, options);
free(hexcpy);
return ret;
}
/* NORMAL HEXSIG sigopt handling */
/* FULLWORD sigopt handling - only happens once */
if (sigopts & ACPATT_OPTION_FULLWORD) {
char *rechar;
size_t ovrlen = strlen(hexcpy) + 7;
char *hexovr = cli_calloc(ovrlen, sizeof(char));
if (!hexovr) {
free(hexcpy);
return CL_EMEM;
}
snprintf(hexovr, ovrlen, "(W)%s(W)", hexcpy);
/* change the '[' and ']' to '{' and '}' since there are now two bytes */
rechar = hexovr;
while ((rechar = strchr(rechar, '['))) { // TEST TODO
*rechar = '{';
if (!(rechar = strchr(rechar, ']'))) {
cli_errmsg("cli_sigopts_handler: unmatched '[' in signature %s\n", virname);
free(hexcpy);
free(hexovr);
return CL_EMALFDB;
}
*rechar = '}';
}
free(hexcpy);
hexcpy = hexovr;
}
/* WIDE sigopt handling - only happens once (after fullword)
* TODO - consider handling in cli_ac_addpatt? (two pattern possibility)
*/
if (sigopts & ACPATT_OPTION_WIDE) {
size_t hexcpylen = strlen(hexcpy);
size_t ovrlen = 2 * hexcpylen + 1;
char *hexovr = cli_calloc(ovrlen, sizeof(char));
if (!hexovr) {
free(hexcpy);
return CL_EMEM;
}
/* clamav-specific wildcards need to be handled here! */
for (i = 0; i < hexcpylen; ++i) {
size_t len = strlen(hexovr);
if (hexcpy[i] == '*' || hexcpy[i] == '|' || hexcpy[i] == ')') {
hexovr[len] = hexcpy[i];
} else if (hexcpy[i] == '[') {
/* change the '[' and ']' to '{' and '}' since there are now two bytes */
hexovr[len++] = '{';
++i;
while (i < strlen(hexcpy) && hexcpy[i] != ']')
hexovr[len++] = hexcpy[i++];
hexovr[len] = '}';
} else if (hexcpy[i] == '{') {
while (i < hexcpylen && hexcpy[i] != '}')
hexovr[len++] = hexcpy[i++];
hexovr[len] = '}';
} else if (hexcpy[i] == '!' || hexcpy[i] == '(') {
if (hexcpy[i] == '!')
hexovr[len++] = hexcpy[i++];
/* copies '(' */
hexovr[len] = hexcpy[i];
if (i + 2 >= hexcpylen) {
free(hexcpy);
free(hexovr);
return CL_EMALFDB;
} else if (hexcpy[i + 1] == 'B' || hexcpy[i + 1] == 'L' || hexcpy[i + 1] == 'W') {
++len;
++i;
hexovr[len++] = hexcpy[i++];
if (hexcpy[i] != ')') {
free(hexcpy);
free(hexovr);
return CL_EMALFDB;
}
hexovr[len] = hexcpy[i];
}
} else {
// snprintf(hexovr+len, ovrlen-len, "%02x%c%c", 0, hexcpy[i], hexcpy[i+1]);
snprintf(hexovr + len, ovrlen - len, "%c%c%02x", hexcpy[i], hexcpy[i + 1], 0);
++i;
}
}
/* NOCASE sigopt is handled in cli_ac_addsig */
ret = cli_add_content_match_pattern(root, virname, hexovr, sigopts, rtype, type, offset, lsigid, options);
free(hexovr);
if (ret != CL_SUCCESS || !(sigopts & ACPATT_OPTION_ASCII)) {
free(hexcpy);
return ret;
} else {
/* disable wide sigopt for ascii variant */
sigopts &= ~ACPATT_OPTION_WIDE;
}
}
/* ASCII sigopt; NOCASE sigopt is handled in cli_ac_addsig */
ret = cli_add_content_match_pattern(root, virname, hexcpy, sigopts, rtype, type, offset, lsigid, options);
free(hexcpy);
return ret;
}
/**
* @brief Parse a regex term: a logical subsignature or yara regex string
*
* expected format => ^offset:trigger/regex/[cflags]$
*
* @param root The matcher root (engine structure containing loaded signature patterns for matching)
* @param virname Name of signature that this regex subsig came from.
* @param hexsig The string containing the regex
* @param offset The string offset where the pattern starts
* @param lsigid An array of 2 uint32_t numbers: lsig_id and subsig_id. May be NULL for testing.
* @param options Database options. See CL_DB_* macros in clamav.h.
* @return cl_error_t
*/
static cl_error_t readdb_load_regex_subsignature(struct cli_matcher *root, const char *virname, char *hexsig,
const char *offset, const uint32_t *lsigid, unsigned int options)
{
cl_error_t status = CL_EPARSE;
cl_error_t ret;
char *hexcpy = NULL;
char *start = NULL;
char *end = NULL;
const char *trigger, *pattern, *cflags;
// The maximum number of `:` delimited fields in a regex subsignature.
#define MAX_REGEX_SUB_TOKENS 4
char *subtokens[MAX_REGEX_SUB_TOKENS + 1];
const char *sig;
if (0 == strncmp(virname, "YARA", 4)) {
// Do not tokenize for ':' in yara regex strings. ':' do not have special meaning in yara regex strings.
// Also, Yara regex strings may use '/' without escape characters, which confuses the "within_pcre" feature of `cli_ldbtokenize()`.
sig = hexsig;
} else {
// LDB PCRE subsignatures have this structure:
// [Offset:]Trigger/PCRE/[Flags]
// We need to split on the ':' character in case the offset was specified.
size_t subtokens_count = cli_ldbtokenize(hexsig, ':', MAX_REGEX_SUB_TOKENS + 1, (const char **)subtokens, 0);
if (!subtokens_count) {
cli_errmsg("Invalid or unsupported ldb subsignature format\n");
status = CL_EMALFDB;
goto done;
}
if (subtokens_count == 2) {
// Offset was specified
offset = subtokens[0];
sig = subtokens[1];
} else {
sig = subtokens[0];
}
}
/* get copied */
hexcpy = cli_strdup(sig);
if (!hexcpy) {
status = CL_EMEM;
goto done;
}
/* get delimiters-ed */
start = strchr(hexcpy, '/');
end = strrchr(hexcpy, '/');
/* get pcre-ed */
if (start == end) {
cli_errmsg("PCRE subsig mismatched '/' delimiter\n");
status = CL_EMALFDB;
goto done;
}
/* get checked */
if (hexsig[0] == '/') {
cli_errmsg("PCRE subsig must contain logical trigger\n");
status = CL_EMALFDB;
goto done;
}
/* get NULL-ed */
*start = '\0';
*end = '\0';
/* get tokens-ed */
trigger = hexcpy;
pattern = start + 1;
cflags = end + 1;
if (*cflags == '\0') /* get compat-ed */
cflags = NULL;
/* normal trigger, get added */
ret = cli_pcre_addpatt(root, virname, trigger, pattern, cflags, offset, lsigid, options);
if (CL_SUCCESS != ret) {
cli_errmsg("Problem adding PCRE subsignature.\n");
status = ret;
goto done;
}
status = CL_SUCCESS;
done:
FREE(hexcpy);
return status;
}
cl_error_t readdb_parse_ldb_subsignature(struct cli_matcher *root, const char *virname, char *hexsig,
const char *offset, const uint32_t *lsigid, unsigned int options,
int current_subsig_index, int num_subsigs, struct cli_lsig_tdb *tdb)
{
cl_error_t status = CL_EPARSE;
cl_error_t ret;
char *hexcpy = NULL;
char *start = NULL, *mid = NULL, *end = NULL;
FFIError *fuzzy_hash_load_error = NULL;
if (hexsig[0] == '$') {
/*
* Looks like a macro subsignature
*/
size_t hexlen;
unsigned int smin, smax, tid;
struct cli_ac_patt *patt;
hexlen = strlen(hexsig);
if (hexsig[hexlen - 1] != '$') {
cli_errmsg("Logical signature macro subsignature is missing the '$' terminator: %s\n", hexsig);
status = CL_EMALFDB;
goto done;
}
if (!lsigid) {
cli_errmsg("Macro subsignatures are only valid inside logical signatures\n");
status = CL_EMALFDB;
goto done;
}
if (sscanf(hexsig, "${%u-%u}%u$", &smin, &smax, &tid) != 3) {
cli_errmsg("Invalid logical macro subsignature format: %s\n", hexsig);
status = CL_EMALFDB;
goto done;
}
if (tid >= 32) {
cli_errmsg("Invalid logical subsignature: only 32 macro groups are supported. %u macro groups found.\n", tid);
status = CL_EMALFDB;
goto done;
}
patt = MPOOL_CALLOC(root->mempool, 1, sizeof(*patt));
if (!patt) {
cli_errmsg("Failed to allocate memory for macro AC pattern struct\n");
status = CL_EMEM;
goto done;
}
/* this is not a pattern that will be matched by AC itself, rather it is a
* pattern checked by the lsig code */
patt->ch_mindist[0] = smin;
patt->ch_maxdist[0] = smax;
patt->sigid = tid;
patt->length[0] = root->ac_mindepth;
/* dummy */
patt->pattern = MPOOL_CALLOC(root->mempool, patt->length[0], sizeof(*patt->pattern));
if (!patt->pattern) {
free(patt);
status = CL_EMEM;
goto done;
}
if (CL_SUCCESS != (ret = cli_ac_addpatt(root, patt))) {
MPOOL_FREE(root->mempool, patt->pattern);
free(patt);
status = ret;
goto done;
}
if (current_subsig_index > 0) {
/* allow mapping from lsig back to pattern for macros */
if (!tdb->macro_ptids)
tdb->macro_ptids = MPOOL_CALLOC(root->mempool, num_subsigs, sizeof(*tdb->macro_ptids));
if (!tdb->macro_ptids) {
status = CL_EMEM;
goto done;
}
tdb->macro_ptids[current_subsig_index - 1] = root->ac_patterns - 1;
}
} else if (strchr(hexsig, '/')) {
/*
* Looks like a pcre subsignature.
*/
ret = readdb_load_regex_subsignature(root, virname, hexsig, offset, lsigid, options);
if (CL_SUCCESS != ret) {
status = ret;
goto done;
}
} else if ((start = strchr(hexsig, '(')) && (mid = strchr(hexsig, '#')) && (end = strrchr(hexsig, '#')) && mid != end) {
/*
* Looks like an byte_compare subsignature.
*/
if (CL_SUCCESS != (ret = cli_bcomp_addpatt(root, virname, hexsig, lsigid, options))) {
cli_errmsg("Problem adding byte compare subsignature: %s\n", hexsig);
status = ret;
goto done;
}
} else if (0 == strncmp(hexsig, "fuzzy_img#", strlen("fuzzy_img#"))) {
/*
* format seems to match fuzzy image hash
*/
bool load_successful;
if (lsigid != NULL) {
/* fuzzy hash is a part of a logical signature (normal use case) */
load_successful = fuzzy_hash_load_subsignature(root->fuzzy_hashmap, hexsig, lsigid[0], lsigid[1], &fuzzy_hash_load_error);
} else {
/* No logical signature, must be `sigtool --test-sigs`
* TODO: sigtool should really load the logical sig properly and we can get rid of this logic.
* Note: similar functionality is inside of cli_bcomp_addpatt() and cli_pcre_addpatt() */
load_successful = fuzzy_hash_load_subsignature(root->fuzzy_hashmap, hexsig, 0, 0, &fuzzy_hash_load_error);
}
if (!load_successful) {
cli_errmsg(
"Failed to load fuzzy hash logical subsignature '%s': %s\n"
"Expected format: algorithm#hash[#hammingdistance]\n"
" where\n"
" - algorithm: Must be 'fuzzy_img'\n"
" - hash: Must be an 8-byte hex string\n"
" - hammingdistance: (optional) Must be an unsigned integer\n",
hexsig, ffierror_fmt(fuzzy_hash_load_error));
status = CL_EFORMAT;
goto done;
}
} else {
/*
* Looks like an AC/BM content match subsignature.
*/
const char *sigopts = NULL;
uint8_t subsig_opts = 0;
int subtokens_count;
const char *sig;
// The maximum number of `:` delimited fields in a regex subsignature.
#define MAX_CONTENTMATCH_SUB_TOKENS 4
char *subtokens[MAX_CONTENTMATCH_SUB_TOKENS + 1];
subtokens_count = cli_ldbtokenize(hexsig, ':', MAX_CONTENTMATCH_SUB_TOKENS + 1, (const char **)subtokens, 0);
if (!subtokens_count) {
cli_errmsg("Invalid or unsupported ldb subsignature format\n");
status = CL_EMALFDB;
goto done;
}
if ((subtokens_count % 2) == 0)
offset = subtokens[0];
if (subtokens_count == 3)
sigopts = subtokens[2];
else if (subtokens_count == 4)
sigopts = subtokens[3];
if (sigopts) { /* signature modifiers */
size_t j;
for (j = 0; j < strlen(sigopts); j++)
switch (sigopts[j]) {
case 'i':
subsig_opts |= ACPATT_OPTION_NOCASE;
break;
case 'f':
subsig_opts |= ACPATT_OPTION_FULLWORD;
break;
case 'w':
subsig_opts |= ACPATT_OPTION_WIDE;
break;
case 'a':
subsig_opts |= ACPATT_OPTION_ASCII;
break;
default:
cli_errmsg("Signature for %s uses invalid option: %02x\n", virname, sigopts[j]);
status = CL_EMALFDB;
goto done;
}
}
sig = (subtokens_count % 2) ? subtokens[0] : subtokens[1];
if (subsig_opts) {
ret = cli_sigopts_handler(root, virname, sig, subsig_opts, 0, 0, offset, lsigid, options);
} else {
ret = cli_add_content_match_pattern(root, virname, sig, 0, 0, 0, offset, lsigid, options);
}
if (CL_SUCCESS != ret) {
status = ret;
goto done;
}
}
status = CL_SUCCESS;
done:
if (NULL != fuzzy_hash_load_error) {
ffierror_free(fuzzy_hash_load_error);
}
FREE(hexcpy);
return status;
}
/**
* @brief Parse a yara string (subsignature equivalent in yara lingo).
*
* @param root The matcher root (engine structure containing loaded signature patterns for matching)
* @param virname Name of signature that this regex subsig came from.
* @param hexsig The string containing the regex
* @param subsig_opts Content match pattern options. See ACPATT_* macros in matcher-ac.h.
* @param offset The string offset where the pattern starts
* @param lsigid An array of 2 uint32_t numbers: lsig_id and subsig_id. May be NULL for testing.
* @param options Database options. See CL_DB_* macros in clamav.h.
* @return cl_error_t
*/
static cl_error_t readdb_parse_yara_string(struct cli_matcher *root, const char *virname, char *hexsig, uint8_t subsig_opts,
const char *offset, const uint32_t *lsigid, unsigned int options)
{
cl_error_t status = CL_EPARSE;
cl_error_t ret;
if (strchr(hexsig, '/')) {
/*
* Looks like a pcre subsignature.
*/
ret = readdb_load_regex_subsignature(root, virname, hexsig, offset, lsigid, options);
} else {
/*
* Looks like an AC/BM content match subsignature.
*/
if (subsig_opts) {
ret = cli_sigopts_handler(root, virname, hexsig, subsig_opts, 0, 0, offset, lsigid, options);
} else {
ret = cli_add_content_match_pattern(root, virname, hexsig, 0, 0, 0, offset, lsigid, options);
}
}
if (CL_SUCCESS != ret) {
status = ret;
goto done;
}
status = CL_SUCCESS;
done:
return status;
}
#define PCRE_TOKENS 4
/**
* @brief Load body-based content patterns that will be matched with AC or BM matchers
*
* May be used when loading db, ndb, ldb subsignatures, ftm, and even patterns crafted from yara rules.
*
* @param root The matcher root (engine structure containing loaded signature patterns for matching)
* @param virname Name of signature that this regex subsig came from.
* @param hexsig The string containing the regex
* @param sigopts Content match pattern options. See ACPATT_* macros in matcher-ac.h.
* @param rtype
* @param type
* @param offset The string offset where the pattern starts
* @param lsigid An array of 2 uint32_t numbers: lsig_id and subsig_id. May be NULL for testing.
* @param options Database options. See CL_DB_* macros in clamav.h.
* @return cl_error_t
*/
cl_error_t cli_add_content_match_pattern(struct cli_matcher *root, const char *virname, const char *hexsig,
uint8_t sigopts, uint16_t rtype, uint16_t type,
const char *offset, const uint32_t *lsigid, unsigned int options)
{
struct cli_bm_patt *bm_new;
char *pt, *hexcpy, *n, l, r;
const char *wild;
cl_error_t ret;
bool asterisk = false;
size_t range, i, j, hexlen, nest;
int mindist = 0, maxdist = 0, error = 0;
char *start = NULL;
hexlen = strlen(hexsig);
if ((wild = strchr(hexsig, '{'))) {
/*
* hexsig contains '{' for "{n}" or "{n-m}" wildcard
*/
uint16_t parts = 1;
if (sscanf(wild, "%c%zu%c", &l, &range, &r) == 3 && l == '{' && r == '}' && range > 0 && range < 128) {
/*
* Parse "{n}" wildcard - Not a "{n-m}" range-style one.
* Replaces it with: "??" * n and then re-parses the modified hexsig with recursion.
*/
hexcpy = cli_calloc(hexlen + 2 * range, sizeof(char));
if (!hexcpy)
return CL_EMEM;
strncpy(hexcpy, hexsig, wild - hexsig);
for (i = 0; i < range; i++) {
strcat(hexcpy, "??");
}
if (!(wild = strchr(wild, '}'))) {
cli_errmsg("cli_add_content_match_pattern: Problem adding signature: missing bracket\n");
free(hexcpy);
return CL_EMALFDB;
}
strcat(hexcpy, ++wild);
ret = cli_add_content_match_pattern(root, virname, hexcpy, sigopts, rtype, type, offset, lsigid, options);
free(hexcpy);
return ret;
}
root->ac_partsigs++;
/*
* Identify number of signature pattern parts (e.g. patterns separated by "{n}" or '*')
* Have to figure this out in advance because `cli_ac_addsig()` needs to know which i-out-of-n parts when adding.
*/
nest = 0;
for (i = 0; i < hexlen; i++) {
if (hexsig[i] == '(') {
nest++;
} else if (hexsig[i] == ')') {
nest--;
} else if (hexsig[i] == '{') {
/* Found "{n}" or "{min-max}" wildcard. That means we've found a new hexsig "part" */
if (nest) {
/* Can't use "{n}" or "{min-max}" wildcard inside of a (aa|bb) alternative match pattern. */
cli_errmsg("cli_add_content_match_pattern: Alternative match contains unsupported ranged wildcard\n");
return CL_EMALFDB;
}
parts++;
} else if (hexsig[i] == '*') {
/* Found '*' wildcard. That means we've found a new hexsig "part" */
if (nest) {
/* Can't use '*' wildcard inside of a (aa|bb) alternative match pattern. */
cli_errmsg("cli_add_content_match_pattern: Alternative match cannot contain unbounded wildcards\n");
return CL_EMALFDB;
}
parts++;
}
}
/*
* Now find each part again *cough*, and this time call cli_ac_addsig() for each.
*/
// Make a copy of the whole pattern so that we can NULL-terminate the hexsig
// and pass it to cli_ac_addsig() without having to pass the part-length.
if (!(hexcpy = cli_strdup(hexsig)))
return CL_EMEM;
start = pt = hexcpy;
for (i = 1; i <= parts; i++) {
if (i != parts) {
for (j = 0; j < strlen(start); j++) {
if (start[j] == '{') {
asterisk = false;
pt = start + j;
break;
}
if (start[j] == '*') {
asterisk = true;
pt = start + j;
break;
}
}
*pt++ = 0;
}
if (CL_SUCCESS != (ret = cli_ac_addsig(root, virname, start, sigopts, root->ac_partsigs, parts, i, rtype, type, mindist, maxdist, offset, lsigid, options))) {
cli_errmsg("cli_add_content_match_pattern: Problem adding signature (1).\n");
error = 1;
break;
}
if (i == parts)
break;
// This time around, we need to parse the integer values from "{n}" or "{min-max}"
// to be used when we call `cli_ac_addsig()` for the next part.
mindist = maxdist = 0;
if (asterisk) {
start = pt;
continue;
}
if (!(start = strchr(pt, '}'))) {
error = 1;
break;
}
*start++ = 0;
if (!pt) {
error = 1;
break;
}
if (!strchr(pt, '-')) {
// Pattern is "{n}"
if (!cli_isnumber(pt) || (mindist = maxdist = atoi(pt)) < 0) {
error = 1;
break;
}
} else {
// pattern is "{min-max}"
if ((n = cli_strtok(pt, 0, "-"))) {
if (!cli_isnumber(n) || (mindist = atoi(n)) < 0) {
error = 1;
free(n);
break;
}
free(n);
}
if ((n = cli_strtok(pt, 1, "-"))) {
if (!cli_isnumber(n) || (maxdist = atoi(n)) < 0) {
error = 1;
free(n);
break;
}
free(n);
}
if ((n = cli_strtok(pt, 2, "-"))) { /* strict check */
error = 1;
free(n);
break;
}
}
}
free(hexcpy);
if (error) {
cli_errmsg("cli_add_content_match_pattern: Problem adding signature (1b).\n");
return CL_EMALFDB;
}
} else if (strchr(hexsig, '*')) {
/*
* hexsig contains '*' for `*` wildcard
*/
uint16_t parts = 1;
root->ac_partsigs++;
nest = 0;
for (i = 0; i < hexlen; i++) {
if (hexsig[i] == '(')
nest++;
else if (hexsig[i] == ')')
nest--;
else if (hexsig[i] == '*') {
if (nest) {
cli_errmsg("cli_add_content_match_pattern: Alternative match cannot contain unbounded wildcards\n");
return CL_EMALFDB;
}
parts++;
}
}
for (i = 1; i <= parts; i++) {
if ((pt = cli_strtok(hexsig, i - 1, "*")) == NULL) {
cli_errmsg("cli_add_content_match_pattern: Can't extract part %zu of partial signature.\n", i);
return CL_EMALFDB;
}
if (CL_SUCCESS != (ret = cli_ac_addsig(root, virname, pt, sigopts, root->ac_partsigs, parts, i, rtype, type, 0, 0, offset, lsigid, options))) {
cli_errmsg("cli_add_content_match_pattern: Problem adding signature (2).\n");
free(pt);
return ret;
}
free(pt);
}
} else if (root->ac_only || type || lsigid || sigopts || strpbrk(hexsig, "?([") || (root->bm_offmode && (!strcmp(offset, "*") || strchr(offset, ','))) || strstr(offset, "VI") || strchr(offset, '$')) {
/*
* format seems like it must be handled with the Aho-Corasick (AC) pattern matcher.
*/
if (CL_SUCCESS != (ret = cli_ac_addsig(root, virname, hexsig, sigopts, 0, 0, 0, rtype, type, 0, 0, offset, lsigid, options))) {
cli_errmsg("cli_add_content_match_pattern: Problem adding signature (3).\n");
return ret;
}
} else {
/*
* format seems like it can be handled with the Boyer-Moore (BM) pattern matcher.
*/
bm_new = (struct cli_bm_patt *)MPOOL_CALLOC(root->mempool, 1, sizeof(struct cli_bm_patt));
if (!bm_new)
return CL_EMEM;
bm_new->pattern = (unsigned char *)CLI_MPOOL_HEX2STR(root->mempool, hexsig);
if (!bm_new->pattern) {
MPOOL_FREE(root->mempool, bm_new);
return CL_EMALFDB;
}
bm_new->length = hexlen / 2;
bm_new->virname = CLI_MPOOL_VIRNAME(root->mempool, virname, options & CL_DB_OFFICIAL);
if (!bm_new->virname) {
MPOOL_FREE(root->mempool, bm_new->pattern);
MPOOL_FREE(root->mempool, bm_new);
return CL_EMEM;
}
if (bm_new->length > root->maxpatlen)
root->maxpatlen = bm_new->length;
if (CL_SUCCESS != (ret = cli_bm_addpatt(root, bm_new, offset))) {
cli_errmsg("cli_add_content_match_pattern: Problem adding signature (4).\n");
MPOOL_FREE(root->mempool, bm_new->pattern);
MPOOL_FREE(root->mempool, bm_new->virname);
MPOOL_FREE(root->mempool, bm_new);
return ret;
}
}
return CL_SUCCESS;
}
cl_error_t cli_initroots(struct cl_engine *engine, unsigned int options)
{
int i, ret;
struct cli_matcher *root;
UNUSEDPARAM(options);
cli_dbgmsg("Initializing engine matching structures\n");
for (i = 0; i < CLI_MTARGETS; i++) {
if (!engine->root[i]) {
root = engine->root[i] = (struct cli_matcher *)MPOOL_CALLOC(engine->mempool, 1, sizeof(struct cli_matcher));
if (!root) {
cli_errmsg("cli_initroots: Can't allocate memory for cli_matcher\n");
return CL_EMEM;
}
#ifdef USE_MPOOL
root->mempool = engine->mempool;
#endif
root->type = i;
if (cli_mtargets[i].ac_only || engine->ac_only)
root->ac_only = 1;
if (CL_SUCCESS != (ret = cli_ac_init(root, engine->ac_mindepth, engine->ac_maxdepth, engine->dconf->other & OTHER_CONF_PREFILTERING))) {
/* no need to free previously allocated memory here */
cli_errmsg("cli_initroots: Can't initialise AC pattern matcher\n");
return ret;
}
if (!root->ac_only) {
if (CL_SUCCESS != (ret = cli_bm_init(root))) {
cli_errmsg("cli_initroots: Can't initialise BM pattern matcher\n");
return ret;
}
}
root->fuzzy_hashmap = fuzzy_hashmap_new();
}
}
engine->root[1]->bm_offmode = 1; /* BM offset mode for PE files */
return CL_SUCCESS;
}
char *cli_dbgets(char *buff, unsigned int size, FILE *fs, struct cli_dbio *dbio)
{
if (fs)
return fgets(buff, size, fs);
if (dbio->usebuf) {
int bread;
char *nl;
while (1) {
if (!dbio->bufpt) {
if (!dbio->size)
return NULL;
if (dbio->gzs) {
bread = gzread(dbio->gzs, dbio->readpt, dbio->readsize);
if (bread == -1) {
cli_errmsg("cli_dbgets: gzread() failed\n");
return NULL;
}
} else {
bread = fread(dbio->readpt, 1, dbio->readsize, dbio->fs);
if (!bread && ferror(dbio->fs)) {
cli_errmsg("cli_dbgets: fread() failed\n");
return NULL;
}
}
if (!bread)
return NULL;
dbio->readpt[bread] = 0;
dbio->bufpt = dbio->buf;
dbio->size -= bread;
dbio->bread += bread;
if (dbio->hashctx)
cl_update_hash(dbio->hashctx, dbio->readpt, bread);
}
if (dbio->chkonly && dbio->bufpt) {
dbio->bufpt = NULL;
dbio->readsize = dbio->size < dbio->bufsize ? dbio->size : dbio->bufsize - 1;
continue;
}
nl = strchr(dbio->bufpt, '\n');
if (nl) {
if (nl - dbio->bufpt >= size) {
cli_errmsg("cli_dbgets: Line too long for provided buffer\n");
return NULL;
}
strncpy(buff, dbio->bufpt, nl - dbio->bufpt);
buff[nl - dbio->bufpt] = 0;
if (nl < dbio->buf + dbio->bufsize) {
dbio->bufpt = ++nl;
} else {
dbio->bufpt = NULL;
dbio->readpt = dbio->buf;
dbio->readsize = dbio->size < dbio->bufsize ? dbio->size : dbio->bufsize - 1;
}
return buff;
} else {
unsigned int remain = dbio->buf + dbio->bufsize - 1 - dbio->bufpt;
if (dbio->bufpt == dbio->buf) {
cli_errmsg("cli_dbgets: Invalid data or internal buffer too small\n");
return NULL;
}
memmove(dbio->buf, dbio->bufpt, remain);
dbio->readpt = dbio->buf + remain;
dbio->readsize = dbio->bufsize - remain;
dbio->readsize = dbio->size < dbio->bufsize - remain ? dbio->size : dbio->bufsize - remain - 1;
dbio->bufpt = NULL;
}
}
} else { /* use gzgets/fgets */
char *pt;
unsigned int bs;
if (!dbio->size)
return NULL;
bs = dbio->size < size ? dbio->size + 1 : size;
if (dbio->gzs)
pt = gzgets(dbio->gzs, buff, bs);
else
pt = fgets(buff, bs, dbio->fs);
if (!pt) {
cli_errmsg("cli_dbgets: Preliminary end of data\n");
return pt;
}
bs = strlen(buff);
dbio->size -= bs;
dbio->bread += bs;
if (dbio->hashctx)
cl_update_hash(dbio->hashctx, buff, bs);
return pt;
}
}
static char *cli_signorm(const char *signame)
{
char *new_signame = NULL;
size_t pad = 0;
size_t nsz;
if (!signame)
return NULL;
nsz = strlen(signame);
if (nsz > 3 && signame[nsz - 1] == '}') {
char *pt = strstr(signame, ".{");
if (pt) /* strip the ".{ }" clause at the end of signame */
nsz = pt - signame;
else
return NULL;
} else if (nsz > 11) {
if (!strncmp(signame + nsz - 11, ".UNOFFICIAL", 11))
nsz -= 11;
else
return NULL;
} else if (nsz > 2)
return NULL;
if (nsz < 3) {
pad = 3 - nsz;
nsz = 3;
}
new_signame = cli_calloc((nsz + 1), sizeof(char));
if (!new_signame)
return NULL;
memcpy(new_signame, signame, nsz - pad);
new_signame[nsz] = '\0';
while (pad > 0)
new_signame[nsz - pad--] = '\x20';
return new_signame;
}
static int cli_chkign(const struct cli_matcher *ignored, const char *signame, const char *entry)
{
const char *md5_expected = NULL;
char *norm_signame;
unsigned char digest[16];
int ret = 0;
if (!ignored || !signame || !entry)
return 0;
norm_signame = cli_signorm(signame);
if (norm_signame != NULL)
signame = norm_signame;
if (cli_bm_scanbuff((const unsigned char *)signame, strlen(signame), &md5_expected, NULL, ignored, 0, NULL, NULL, NULL) == CL_VIRUS)
do {
if (md5_expected) {
cl_hash_data("md5", entry, strlen(entry), digest, NULL);
if (memcmp(digest, (const unsigned char *)md5_expected, 16))
break;
}
cli_dbgmsg("Ignoring signature %s\n", signame);
ret = 1;
} while (0);
if (norm_signame)
free(norm_signame);
return ret;
}
static int cli_chkpua(const char *signame, const char *pua_cats, unsigned int options)
{
char cat[32], *pt;
const char *sig;
int ret;
if (strncmp(signame, "PUA.", 4)) {
cli_dbgmsg("Skipping signature %s - no PUA prefix\n", signame);
return 1;
}
sig = signame + 3;
if (!(pt = strchr(sig + 1, '.'))) {
cli_dbgmsg("Skipping signature %s - bad syntax\n", signame);
return 1;
}
if ((unsigned int)(pt - sig + 2) > sizeof(cat)) {
cli_dbgmsg("Skipping signature %s - too long category name\n", signame);
return 1;
}
strncpy(cat, sig, pt - signame + 1);
cat[pt - sig + 1] = 0;
pt = strstr(pua_cats, cat);
if (options & CL_DB_PUA_INCLUDE)
ret = pt ? 0 : 1;
else
ret = pt ? 1 : 0;
if (ret)
cli_dbgmsg("Skipping PUA signature %s - excluded category\n", signame);
return ret;
}
static cl_error_t cli_loaddb(FILE *fs, struct cl_engine *engine, unsigned int *signo, unsigned int options, struct cli_dbio *dbio, const char *dbname)
{
char buffer[FILEBUFF], *buffer_cpy = NULL, *pt, *start;
unsigned int line = 0, sigs = 0;
int ret = 0;
struct cli_matcher *root;
UNUSEDPARAM(dbname);
if (CL_SUCCESS != (ret = cli_initroots(engine, options)))
return ret;
root = engine->root[0];
if (engine->ignored)
if (!(buffer_cpy = cli_malloc(FILEBUFF))) {
cli_errmsg("cli_loaddb: Can't allocate memory for buffer_cpy\n");
return CL_EMEM;
}
while (cli_dbgets(buffer, FILEBUFF, fs, dbio)) {
line++;
if (buffer[0] == '#')
continue;
cli_chomp(buffer);
if (engine->ignored)
strcpy(buffer_cpy, buffer);
pt = strchr(buffer, '=');
if (!pt) {
cli_errmsg("Malformed pattern line %d\n", line);
ret = CL_EMALFDB;
break;
}
start = buffer;
*pt++ = 0;
if (engine->ignored && cli_chkign(engine->ignored, start, buffer_cpy))
continue;
if (engine->cb_sigload && engine->cb_sigload("db", start, ~options & CL_DB_OFFICIAL, engine->cb_sigload_ctx)) {
cli_dbgmsg("cli_loaddb: skipping %s due to callback\n", start);
continue;
}
if (*pt == '=') continue;
if (CL_SUCCESS != (ret = cli_add_content_match_pattern(root, start, pt, 0, 0, 0, "*", NULL, options))) {
cli_dbgmsg("cli_loaddb: cli_add_content_match_pattern failed on line %d\n", line);
ret = CL_EMALFDB;
break;
}
sigs++;
}
if (engine->ignored)
free(buffer_cpy);
if (!line) {
cli_errmsg("Empty database file\n");
return CL_EMALFDB;
}
if (ret) {
cli_errmsg("Problem parsing database at line %d\n", line);
return ret;
}
if (signo)
*signo += sigs;
return CL_SUCCESS;
}
#define ICO_TOKENS 4
static cl_error_t cli_loadidb(FILE *fs, struct cl_engine *engine, unsigned int *signo, unsigned int options, struct cli_dbio *dbio)
{
const char *tokens[ICO_TOKENS + 1] = {0};
char buffer[FILEBUFF] = {0}, *buffer_cpy = NULL;
uint8_t *hash = NULL;
int ret = CL_SUCCESS;
unsigned int line = 0, sigs = 0, tokens_count, i, size, enginesize;
struct icomtr *metric = NULL;
struct icon_matcher *matcher = NULL;
if (!(matcher = (struct icon_matcher *)MPOOL_CALLOC(engine->mempool, sizeof(*matcher), 1)))
return CL_EMEM;
if (engine->ignored)
if (!(buffer_cpy = cli_malloc(FILEBUFF))) {
cli_errmsg("cli_loadidb: Can't allocate memory for buffer_cpy\n");
MPOOL_FREE(engine->mempool, matcher);
return CL_EMEM;
}
while (cli_dbgets(buffer, FILEBUFF, fs, dbio)) {
line++;
if (buffer[0] == '#')
continue;
cli_chomp(buffer);
if (engine->ignored)
strcpy(buffer_cpy, buffer);
tokens_count = cli_strtokenize(buffer, ':', ICO_TOKENS + 1, tokens);
if (tokens_count != ICO_TOKENS) {
cli_errmsg("cli_loadidb: Malformed hash at line %u (wrong token count)\n", line);
ret = CL_EMALFDB;
break;
}
if (strlen(tokens[3]) != 124) {
cli_errmsg("cli_loadidb: Malformed hash at line %u (wrong length)\n", line);
ret = CL_EMALFDB;
break;
}
if (engine->ignored && cli_chkign(engine->ignored, tokens[0], buffer_cpy))
continue;
if (engine->cb_sigload && engine->cb_sigload("idb", tokens[0], ~options & CL_DB_OFFICIAL, engine->cb_sigload_ctx)) {
cli_dbgmsg("cli_loadidb: skipping %s due to callback\n", tokens[0]);
continue;
}
hash = (uint8_t *)tokens[3];
if (cli_hexnibbles((char *)hash, 124)) {
cli_errmsg("cli_loadidb: Malformed hash at line %u (bad chars)\n", line);
ret = CL_EMALFDB;
break;
}
size = (hash[0] << 4) + hash[1];
if (size != 32 && size != 24 && size != 16) {
cli_errmsg("cli_loadidb: Malformed hash at line %u (bad size)\n", line);
ret = CL_EMALFDB;
break;
}
enginesize = (size >> 3) - 2;
hash += 2;
metric = (struct icomtr *)MPOOL_REALLOC(engine->mempool, matcher->icons[enginesize], sizeof(struct icomtr) * (matcher->icon_counts[enginesize] + 1));
if (!metric) {
ret = CL_EMEM;
break;
}
matcher->icons[enginesize] = metric;
metric += matcher->icon_counts[enginesize];
matcher->icon_counts[enginesize]++;
for (i = 0; i < 3; i++) {
if ((metric->color_avg[i] = (hash[0] << 8) | (hash[1] << 4) | hash[2]) > 4072)
break;
if ((metric->color_x[i] = (hash[3] << 4) | hash[4]) > size - size / 8)
break;
if ((metric->color_y[i] = (hash[5] << 4) | hash[6]) > size - size / 8)
break;
hash += 7;
}
if (i != 3) {
cli_errmsg("cli_loadidb: Malformed hash at line %u (bad color data)\n", line);
ret = CL_EMALFDB;
break;
}
for (i = 0; i < 3; i++) {
if ((metric->gray_avg[i] = (hash[0] << 8) | (hash[1] << 4) | hash[2]) > 4072)
break;
if ((metric->gray_x[i] = (hash[3] << 4) | hash[4]) > size - size / 8)
break;
if ((metric->gray_y[i] = (hash[5] << 4) | hash[6]) > size - size / 8)
break;
hash += 7;
}
if (i != 3) {
cli_errmsg("cli_loadidb: Malformed hash at line %u (bad gray data)\n", line);
ret = CL_EMALFDB;
break;
}
for (i = 0; i < 3; i++) {
metric->bright_avg[i] = (hash[0] << 4) | hash[1];
if ((metric->bright_x[i] = (hash[2] << 4) | hash[3]) > size - size / 8)
break;
if ((metric->bright_y[i] = (hash[4] << 4) | hash[5]) > size - size / 8)
break;
hash += 6;
}
if (i != 3) {
cli_errmsg("cli_loadidb: Malformed hash at line %u (bad bright data)\n", line);
ret = CL_EMALFDB;
break;
}
for (i = 0; i < 3; i++) {
metric->dark_avg[i] = (hash[0] << 4) | hash[1];
if ((metric->dark_x[i] = (hash[2] << 4) | hash[3]) > size - size / 8)
break;
if ((metric->dark_y[i] = (hash[4] << 4) | hash[5]) > size - size / 8)
break;
hash += 6;
}
if (i != 3) {
cli_errmsg("cli_loadidb: Malformed hash at line %u (bad dark data)\n", line);
ret = CL_EMALFDB;
break;
}
for (i = 0; i < 3; i++) {
metric->edge_avg[i] = (hash[0] << 4) | hash[1];
if ((metric->edge_x[i] = (hash[2] << 4) | hash[3]) > size - size / 8)
break;
if ((metric->edge_y[i] = (hash[4] << 4) | hash[5]) > size - size / 8)
break;
hash += 6;
}
if (i != 3) {
cli_errmsg("cli_loadidb: Malformed hash at line %u (bad edge data)\n", line);
ret = CL_EMALFDB;
break;
}
for (i = 0; i < 3; i++) {
metric->noedge_avg[i] = (hash[0] << 4) | hash[1];
if ((metric->noedge_x[i] = (hash[2] << 4) | hash[3]) > size - size / 8)
break;
if ((metric->noedge_y[i] = (hash[4] << 4) | hash[5]) > size - size / 8)
break;
hash += 6;
}
if (i != 3) {
cli_errmsg("cli_loadidb: Malformed hash at line %u (bad noedge data)\n", line);
ret = CL_EMALFDB;
break;
}
metric->rsum = (hash[0] << 4) | hash[1];
metric->gsum = (hash[2] << 4) | hash[3];
metric->bsum = (hash[4] << 4) | hash[5];
metric->ccount = (hash[6] << 4) | hash[7];
if (metric->rsum + metric->gsum + metric->bsum > 103 || metric->ccount > 100) {
cli_errmsg("cli_loadidb: Malformed hash at line %u (bad spread data)\n", line);
ret = CL_EMALFDB;
break;
}
if (!(metric->name = CLI_MPOOL_STRDUP(engine->mempool, tokens[0]))) {
ret = CL_EMEM;
break;
}
for (i = 0; i < matcher->group_counts[0]; i++) {
if (!strcmp(tokens[1], matcher->group_names[0][i]))
break;
}
if (i == matcher->group_counts[0]) {
if (!(matcher->group_names[0] = MPOOL_REALLOC(engine->mempool, matcher->group_names[0], sizeof(char *) * (i + 1))) ||
!(matcher->group_names[0][i] = CLI_MPOOL_STRDUP(engine->mempool, tokens[1]))) {
ret = CL_EMEM;
break;
}
matcher->group_counts[0]++;
}
metric->group[0] = i;
for (i = 0; i < matcher->group_counts[1]; i++) {
if (!strcmp(tokens[2], matcher->group_names[1][i]))
break;
}
if (i == matcher->group_counts[1]) {
if (!(matcher->group_names[1] = MPOOL_REALLOC(engine->mempool, matcher->group_names[1], sizeof(char *) * (i + 1))) ||
!(matcher->group_names[1][i] = CLI_MPOOL_STRDUP(engine->mempool, tokens[2]))) {
ret = CL_EMEM;
break;
}
matcher->group_counts[1]++;
}
metric->group[1] = i;
if (matcher->group_counts[0] > 256 || matcher->group_counts[1] > 256) {
cli_errmsg("cli_loadidb: too many icon groups!\n");
ret = CL_EMALFDB;
break;
}
sigs++;
}
if (engine->ignored)
free(buffer_cpy);
if (!line) {
cli_errmsg("cli_loadidb: Empty database file\n");
ret = CL_EMALFDB;
}
if (ret) {
cli_errmsg("cli_loadidb: Problem parsing database at line %u\n", line);
MPOOL_FREE(engine->mempool, matcher);
return ret;
}
if (signo)
*signo += sigs;
engine->iconcheck = matcher;
return CL_SUCCESS;
}
static int cli_loadwdb(FILE *fs, struct cl_engine *engine, unsigned int options, struct cli_dbio *dbio)
{
int ret = 0;
if (!(engine->dconf->phishing & PHISHING_CONF_ENGINE))
return CL_SUCCESS;
if (!engine->allow_list_matcher) {
if (CL_SUCCESS != (ret = init_allow_list(engine))) {
return ret;
}
}
if (CL_SUCCESS != (ret = load_regex_matcher(engine, engine->allow_list_matcher, fs, NULL, options, 1, dbio, engine->dconf->other & OTHER_CONF_PREFILTERING))) {
return ret;
}
return CL_SUCCESS;
}
static int cli_loadpdb(FILE *fs, struct cl_engine *engine, unsigned int *signo, unsigned int options, struct cli_dbio *dbio)
{
int ret = 0;
if (!(engine->dconf->phishing & PHISHING_CONF_ENGINE))
return CL_SUCCESS;
if (!engine->domain_list_matcher) {
if (CL_SUCCESS != (ret = init_domain_list(engine))) {
return ret;
}
}
if (CL_SUCCESS != (ret = load_regex_matcher(engine, engine->domain_list_matcher, fs, signo, options, 0, dbio, engine->dconf->other & OTHER_CONF_PREFILTERING))) {
return ret;
}
return CL_SUCCESS;
}
#define NDB_TOKENS 6
static int cli_loadndb(FILE *fs, struct cl_engine *engine, unsigned int *signo, unsigned short sdb, unsigned int options, struct cli_dbio *dbio, const char *dbname)
{
const char *tokens[NDB_TOKENS + 1];
char buffer[FILEBUFF], *buffer_cpy = NULL;
const char *sig, *virname, *offset, *pt;
struct cli_matcher *root;
int line = 0, sigs = 0, ret = 0, tokens_count;
cli_target_t target;
unsigned int phish = options & CL_DB_PHISHING;
UNUSEDPARAM(dbname);
if (CL_SUCCESS != (ret = cli_initroots(engine, options)))
return ret;
if (engine->ignored)
if (!(buffer_cpy = cli_malloc(FILEBUFF))) {
cli_errmsg("cli_loadndb: Can't allocate memory for buffer_cpy\n");
return CL_EMEM;
}
while (cli_dbgets(buffer, FILEBUFF, fs, dbio)) {
line++;
if (buffer[0] == '#')
continue;
if (!phish)
if (!strncmp(buffer, "HTML.Phishing", 13) || !strncmp(buffer, "Email.Phishing", 14))
continue;
cli_chomp(buffer);
if (engine->ignored)
strcpy(buffer_cpy, buffer);
tokens_count = cli_strtokenize(buffer, ':', NDB_TOKENS + 1, tokens);
if (tokens_count < 4 || tokens_count > 6) {
ret = CL_EMALFDB;
break;
}
virname = tokens[0];
if (engine->pua_cats && (options & CL_DB_PUA_MODE) && (options & (CL_DB_PUA_INCLUDE | CL_DB_PUA_EXCLUDE)))
if (cli_chkpua(virname, engine->pua_cats, options))
continue;
if (engine->ignored && cli_chkign(engine->ignored, virname, buffer_cpy))
continue;
if (!sdb && engine->cb_sigload && engine->cb_sigload("ndb", virname, ~options & CL_DB_OFFICIAL, engine->cb_sigload_ctx)) {
cli_dbgmsg("cli_loadndb: skipping %s due to callback\n", virname);
continue;
}
if (tokens_count > 4) { /* min version */
pt = tokens[4];
if (!cli_isnumber(pt)) {
ret = CL_EMALFDB;
break;
}
if ((unsigned int)atoi(pt) > cl_retflevel()) {
cli_dbgmsg("Signature for %s not loaded (required f-level: %d)\n", virname, atoi(pt));
continue;
}
if (tokens_count == 6) { /* max version */
pt = tokens[5];
if (!cli_isnumber(pt)) {
ret = CL_EMALFDB;
break;
}
if ((unsigned int)atoi(pt) < cl_retflevel()) {
continue;
}
}
}
if (!(pt = tokens[1]) || (strcmp(pt, "*") && !cli_isnumber(pt))) {
ret = CL_EMALFDB;
break;
}
target = (cli_target_t)atoi(pt);
if (target >= CLI_MTARGETS || target < 0) {
cli_dbgmsg("Not supported target type (%d) in signature for %s\n", (int)target, virname);
continue;
}
root = engine->root[(size_t)target];
offset = tokens[2];
sig = tokens[3];
if (CL_SUCCESS != (ret = cli_add_content_match_pattern(root, virname, sig, 0, 0, 0, offset, NULL, options))) {
ret = CL_EMALFDB;
break;
}
sigs++;
if (engine->cb_sigload_progress && ((*signo + sigs) % 10000 == 0)) {
/* Let the progress callback function know how we're doing */
(void)engine->cb_sigload_progress(engine->num_total_signatures, *signo + sigs, engine->cb_sigload_progress_ctx);
}
}
if (engine->ignored)
free(buffer_cpy);
if (!line) {
cli_errmsg("Empty database file\n");
return CL_EMALFDB;
}
if (ret) {
cli_errmsg("Problem parsing database at line %d\n", line);
return ret;
}
if (signo)
*signo += sigs;
if (sdb && sigs && !engine->sdb) {
engine->sdb = 1;
cli_dbgmsg("*** Self protection mechanism activated.\n");
}
return CL_SUCCESS;
}
struct lsig_attrib {
const char *name;
unsigned int type;
void **pt;
};
/* TODO: rework this */
static int lsigattribs(char *attribs, struct cli_lsig_tdb *tdb)
{
// clang-format off
#define ATTRIB_TOKENS 10
#define EXPR_TOKEN_MAX 16
struct lsig_attrib attrtab[] = {
{ "Target", CLI_TDB_UINT, (void **) &tdb->target },
{ "Engine", CLI_TDB_RANGE, (void **) &tdb->engine },
{ "FileSize", CLI_TDB_RANGE, (void **) &tdb->filesize },
{ "EntryPoint", CLI_TDB_RANGE, (void **) &tdb->ep },
{ "NumberOfSections", CLI_TDB_RANGE, (void **) &tdb->nos },
{ "IconGroup1", CLI_TDB_STR, (void **) &tdb->icongrp1 },
{ "IconGroup2", CLI_TDB_STR, (void **) &tdb->icongrp2 },
{ "Container", CLI_TDB_FTYPE, (void **) &tdb->container },
{ "HandlerType", CLI_TDB_FTYPE, (void **) &tdb->handlertype },
{ "Intermediates", CLI_TDB_FTYPE_EXPR, (void **) &tdb->intermediates },
/*
{ "SectOff", CLI_TDB_RANGE2, (void **) &tdb->sectoff },
{ "SectRVA", CLI_TDB_RANGE2, (void **) &tdb->sectrva },
{ "SectVSZ", CLI_TDB_RANGE2, (void **) &tdb->sectvsz },
{ "SectRAW", CLI_TDB_RANGE2, (void **) &tdb->sectraw },
{ "SectRSZ", CLI_TDB_RANGE2, (void **) &tdb->sectrsz },
{ "SectURVA", CLI_TDB_RANGE2, (void **) &tdb->secturva },
{ "SectUVSZ", CLI_TDB_RANGE2, (void **) &tdb->sectuvsz },
{ "SectURAW", CLI_TDB_RANGE2, (void **) &tdb->secturaw },
{ "SectURSZ", CLI_TDB_RANGE2, (void **) &tdb->sectursz },
*/
{ NULL, 0, NULL, }
};
// clang-format on
struct lsig_attrib *apt;
char *tokens[ATTRIB_TOKENS], *pt, *pt2;
unsigned int v1, v2, v3, i, j, tokens_count, have_newext = 0;
uint32_t cnt, off[ATTRIB_TOKENS];
tokens_count = cli_strtokenize(attribs, ',', ATTRIB_TOKENS, (const char **)tokens);
for (i = 0; i < tokens_count; i++) {
if (!(pt = strchr(tokens[i], ':'))) {
cli_errmsg("lsigattribs: Incorrect format of attribute '%s'\n", tokens[i]);
return -1;
}
*pt++ = 0;
apt = NULL;
for (j = 0; attrtab[j].name; j++) {
if (!strcmp(attrtab[j].name, tokens[i])) {
apt = &attrtab[j];
break;
}
}
if (!apt) {
cli_dbgmsg("lsigattribs: Unknown attribute name '%s'\n", tokens[i]);
return 1;
}
if (!strcmp(apt->name, "Engine")) {
if (i) {
cli_errmsg("lsigattribs: For backward compatibility the Engine attribute must be on the first position\n");
return -1;
}
} else if (strcmp(apt->name, "Target")) {
have_newext = 1;
}
switch (apt->type) {
case CLI_TDB_UINT:
if (!cli_isnumber(pt)) {
cli_errmsg("lsigattribs: Invalid argument for %s\n", tokens[i]);
return -1;
}
off[i] = cnt = tdb->cnt[CLI_TDB_UINT]++;
tdb->val = (uint32_t *)MPOOL_REALLOC2(tdb->mempool, tdb->val, tdb->cnt[CLI_TDB_UINT] * sizeof(uint32_t));
if (!tdb->val) {
tdb->cnt[CLI_TDB_UINT] = 0;
return -1;
}
tdb->val[cnt] = atoi(pt);
break;
case CLI_TDB_FTYPE:
if ((v1 = cli_ftcode(pt)) == CL_TYPE_ERROR) {
cli_dbgmsg("lsigattribs: Unknown file type '%s' in %s\n", pt, tokens[i]);
return 1; /* skip */
}
off[i] = cnt = tdb->cnt[CLI_TDB_UINT]++;
tdb->val = (uint32_t *)MPOOL_REALLOC2(tdb->mempool, tdb->val, tdb->cnt[CLI_TDB_UINT] * sizeof(uint32_t));
if (!tdb->val) {
tdb->cnt[CLI_TDB_UINT] = 0;
return -1;
}
tdb->val[cnt] = v1;
break;
case CLI_TDB_FTYPE_EXPR: {
char *ftypes[EXPR_TOKEN_MAX];
unsigned int ftypes_count;
off[i] = cnt = tdb->cnt[CLI_TDB_UINT];
ftypes_count = cli_strtokenize(pt, '>', EXPR_TOKEN_MAX, (const char **)ftypes);
if (!ftypes_count) {
cli_dbgmsg("lsigattribs: No intermediate container tokens found.");
return 1;
}
tdb->cnt[CLI_TDB_UINT] += (ftypes_count + 1);
tdb->val = (uint32_t *)MPOOL_REALLOC2(tdb->mempool, tdb->val, tdb->cnt[CLI_TDB_UINT] * sizeof(uint32_t));
if (!tdb->val) {
tdb->cnt[CLI_TDB_UINT] = 0;
return -1;
}
tdb->val[cnt++] = ftypes_count;
for (j = 0; j < ftypes_count; j++) {
if ((v1 = cli_ftcode(ftypes[j])) == CL_TYPE_ERROR) {
cli_dbgmsg("lsigattribs: Unknown file type '%s' in %s\n", ftypes[j], tokens[i]);
return 1; /* skip */
}
tdb->val[cnt++] = v1;
}
} break;
case CLI_TDB_RANGE:
if (!(pt2 = strchr(pt, '-'))) {
cli_errmsg("lsigattribs: Incorrect parameters in '%s'\n", tokens[i]);
return -1;
}
*pt2++ = 0;
off[i] = cnt = tdb->cnt[CLI_TDB_RANGE];
tdb->cnt[CLI_TDB_RANGE] += 2;
tdb->range = (uint32_t *)MPOOL_REALLOC2(tdb->mempool, tdb->range, tdb->cnt[CLI_TDB_RANGE] * sizeof(uint32_t));
if (!tdb->range) {
tdb->cnt[CLI_TDB_RANGE] = 0;
return -1;
}
if (!cli_isnumber(pt) || !cli_isnumber(pt2)) {
cli_errmsg("lsigattribs: Invalid argument for %s\n", tokens[i]);
return -1;
}
tdb->range[cnt] = atoi(pt);
tdb->range[cnt + 1] = atoi(pt2);
break;
case CLI_TDB_RANGE2:
if (!strchr(pt, '-') || !strchr(pt, '.')) {
cli_errmsg("lsigattribs: Incorrect parameters in '%s'\n", tokens[i]);
return -1;
}
off[i] = cnt = tdb->cnt[CLI_TDB_RANGE];
tdb->cnt[CLI_TDB_RANGE] += 3;
tdb->range = (uint32_t *)MPOOL_REALLOC2(tdb->mempool, tdb->range, tdb->cnt[CLI_TDB_RANGE] * sizeof(uint32_t));
if (!tdb->range) {
tdb->cnt[CLI_TDB_RANGE] = 0;
return -1;
}
if (sscanf(pt, "%u.%u-%u", &v1, &v2, &v3) != 3) {
cli_errmsg("lsigattribs: Can't parse parameters in '%s'\n", tokens[i]);
return -1;
}
tdb->range[cnt] = (uint32_t)v1;
tdb->range[cnt + 1] = (uint32_t)v2;
tdb->range[cnt + 2] = (uint32_t)v3;
break;
case CLI_TDB_STR:
off[i] = cnt = tdb->cnt[CLI_TDB_STR];
tdb->cnt[CLI_TDB_STR] += strlen(pt) + 1;
tdb->str = (char *)MPOOL_REALLOC2(tdb->mempool, tdb->str, tdb->cnt[CLI_TDB_STR] * sizeof(char));
if (!tdb->str) {
cli_errmsg("lsigattribs: Can't allocate memory for tdb->str\n");
return -1;
}
memcpy(&tdb->str[cnt], pt, strlen(pt));
tdb->str[tdb->cnt[CLI_TDB_STR] - 1] = 0;
break;
default:
/* All known TDB types handled above, skip unknown */
cli_dbgmsg("lsigattribs: Unknown attribute type '%u'\n", apt->type);
return 1; /* +1 = skip */
}
}
if (!i) {
cli_errmsg("lsigattribs: Empty TDB\n");
return -1;
}
for (i = 0; i < tokens_count; i++) {
for (j = 0; attrtab[j].name; j++) {
if (!strcmp(attrtab[j].name, tokens[i])) {
apt = &attrtab[j];
break;
}
}
if (!apt)
continue;
switch (apt->type) {
case CLI_TDB_UINT:
case CLI_TDB_FTYPE:
case CLI_TDB_FTYPE_EXPR:
*apt->pt = (uint32_t *)&tdb->val[off[i]];
break;
case CLI_TDB_RANGE:
case CLI_TDB_RANGE2:
*apt->pt = (uint32_t *)&tdb->range[off[i]];
break;
case CLI_TDB_STR:
*apt->pt = (char *)&tdb->str[off[i]];
break;
}
}
if (have_newext && (!tdb->engine || tdb->engine[0] < 51)) {
cli_errmsg("lsigattribs: For backward compatibility all signatures using new attributes must have the Engine attribute present and set to min_level of at least 51 (0.96)\n");
return -1;
}
return 0;
}
#define FREE_TDB(x) \
do { \
if (x.cnt[CLI_TDB_UINT]) \
MPOOL_FREE(x.mempool, x.val); \
if (x.cnt[CLI_TDB_RANGE]) \
MPOOL_FREE(x.mempool, x.range); \
if (x.cnt[CLI_TDB_STR]) \
MPOOL_FREE(x.mempool, x.str); \
if (x.macro_ptids) \
MPOOL_FREE(x.mempool, x.macro_ptids); \
} while (0);
#define FREE_TDB_P(x) \
do { \
if (x->cnt[CLI_TDB_UINT]) \
MPOOL_FREE(x->mempool, x->val); \
if (x->cnt[CLI_TDB_RANGE]) \
MPOOL_FREE(x->mempool, x->range); \
if (x->cnt[CLI_TDB_STR]) \
MPOOL_FREE(x->mempool, x->str); \
if (x->macro_ptids) \
MPOOL_FREE(x->mempool, x->macro_ptids); \
} while (0);
static inline int init_tdb(struct cli_lsig_tdb *tdb, struct cl_engine *engine, char *target, const char *virname)
{
int ret;
#ifdef USE_MPOOL
tdb->mempool = engine->mempool;
#else
UNUSEDPARAM(engine);
#endif
if (CL_SUCCESS != (ret = lsigattribs(target, tdb))) {
FREE_TDB_P(tdb);
if (ret == 1) {
cli_dbgmsg("init_tdb: Not supported attribute(s) in signature for %s, skipping\n", virname);
return CL_BREAK;
}
return CL_EMALFDB;
}
if (tdb->engine) {
if (tdb->engine[0] > cl_retflevel()) {
FREE_TDB_P(tdb);
cli_dbgmsg("init_tdb: Signature for %s not loaded (required f-level: %u)\n", virname, tdb->engine[0]);
return CL_BREAK;
} else if (tdb->engine[1] < cl_retflevel()) {
FREE_TDB_P(tdb);
return CL_BREAK;
}
}
if (!tdb->target) {
FREE_TDB_P(tdb);
cli_errmsg("init_tdb: No target specified in TDB\n");
return CL_EMALFDB;
} else if (tdb->target[0] >= CLI_MTARGETS) {
FREE_TDB_P(tdb);
cli_dbgmsg("init_tdb: Not supported target type in signature for %s, skipping\n", virname);
return CL_BREAK;
}
if ((tdb->icongrp1 || tdb->icongrp2) && tdb->target[0] != TARGET_PE) {
FREE_TDB_P(tdb);
cli_errmsg("init_tdb: IconGroup is only supported in PE (target 1) signatures\n");
return CL_EMALFDB;
}
if ((tdb->ep || tdb->nos) && tdb->target[0] != TARGET_PE && tdb->target[0] != TARGET_ELF && tdb->target[0] != TARGET_MACHO) {
FREE_TDB_P(tdb);
cli_errmsg("init_tdb: EntryPoint/NumberOfSections is only supported in PE/ELF/Mach-O signatures\n");
return CL_EMALFDB;
}
return CL_SUCCESS;
}
/* 0 1 2 3 4 5 ... (max 66)
* VirusName;Attributes;Logic;SubSig1[;SubSig2[;SubSig3 ... ]]
* NOTE: Maximum of 64(see MAX_LDB_SUBSIGS) subsignatures (last would be token 66)
*/
#define LDB_TOKENS 67
static cl_error_t load_oneldb(char *buffer, int chkpua, struct cl_engine *engine, unsigned int options, const char *dbname, unsigned int line, unsigned int *sigs, unsigned bc_idx, const char *buffer_cpy, int *skip)
{
cl_error_t status = CL_EMALFDB;
cl_error_t ret;
const char *virname, *logic;
struct cli_ac_lsig **newtable;
struct cli_ac_lsig *lsig = NULL;
char *tokens[LDB_TOKENS + 1];
int i, subsigs, tokens_count;
struct cli_matcher *root;
struct cli_lsig_tdb tdb;
uint32_t lsigid[2];
bool tdb_initialized = false;
UNUSEDPARAM(dbname);
tokens_count = cli_ldbtokenize(buffer, ';', LDB_TOKENS + 1, (const char **)tokens, 2);
if (tokens_count < 4) {
cli_errmsg("Invalid or unsupported ldb signature format\n");
status = CL_EMALFDB;
goto done;
}
virname = tokens[0];
logic = tokens[2];
if (chkpua && cli_chkpua(virname, engine->pua_cats, options)) {
cli_dbgmsg("cli_loadldb: Skipping PUA signature %s\n", virname);
status = CL_BREAK;
goto done;
}
if (engine->ignored && cli_chkign(engine->ignored, virname, buffer_cpy ? buffer_cpy : virname)) {
if (skip)
*skip = 1;
cli_dbgmsg("cli_loadldb: Skipping ignored signature %s\n", virname);
status = CL_BREAK;
goto done;
}
if (engine->cb_sigload && engine->cb_sigload("ldb", virname, ~options & CL_DB_OFFICIAL, engine->cb_sigload_ctx)) {
cli_dbgmsg("cli_loadldb: skipping %s due to callback\n", virname);
status = CL_BREAK;
goto done;
}
subsigs = cli_ac_chklsig(logic, logic + strlen(logic), NULL, NULL, NULL, 1);
if (subsigs == -1) {
cli_errmsg("Invalid or unsupported ldb logic\n");
status = CL_EMALFDB;
goto done;
}
subsigs++;
if (!line) {
/* This is a logical signature from the bytecode, we need all
* subsignatures, even if not referenced from the logical expression */
if (subsigs > tokens_count - 3) {
cli_errmsg("load_oneldb: Too many subsignatures: %u (max %u)\n",
subsigs, tokens_count - 3);
return CL_EMALFDB;
}
subsigs = tokens_count - 3;
} else if (subsigs != tokens_count - 3) {
cli_errmsg("cli_loadldb: The number of subsignatures (== %u) doesn't match the IDs in the logical expression (== %u)\n", tokens_count - 3, subsigs);
status = CL_EMALFDB;
goto done;
}
#if !HAVE_PCRE
/* Regex Usage and Support Check */
for (i = 0; i < subsigs; ++i) {
char *slash = strchr(tokens[i + 3], '/');
if (slash && strchr(slash + 1, '/')) {
cli_warnmsg("cli_loadldb: logical signature for %s uses PCREs but support is disabled, skipping\n", virname);
status = CL_BREAK;
goto done;
}
}
#endif
/* enforce MAX_LDB_SUBSIGS subsig cap */
if (subsigs > MAX_LDB_SUBSIGS) {
cli_errmsg("cli_loadldb: Broken logical expression or too many subsignatures\n");
status = CL_EMALFDB;
goto done;
}
/* Initialize Target Description Block (TDB) */
memset(&tdb, 0, sizeof(tdb));
if (CL_SUCCESS != (ret = init_tdb(&tdb, engine, tokens[1], virname))) {
if (CL_BREAK == ret) {
status = CL_SUCCESS;
} else {
cli_errmsg("cli_loadldb: Failed to initialize target description block\n");
}
status = ret;
goto done;
}
tdb_initialized = true;
root = engine->root[tdb.target[0]];
lsig = (struct cli_ac_lsig *)MPOOL_CALLOC(engine->mempool, 1, sizeof(struct cli_ac_lsig));
if (!lsig) {
cli_errmsg("cli_loadldb: Can't allocate memory for lsig\n");
status = CL_EMEM;
goto done;
}
lsig->type = CLI_LSIG_NORMAL;
lsig->u.logic = CLI_MPOOL_STRDUP(engine->mempool, logic);
if (!lsig->u.logic) {
cli_errmsg("cli_loadldb: Can't allocate memory for lsig->logic\n");
status = CL_EMEM;
goto done;
}
lsigid[0] = lsig->id = root->ac_lsigs;
newtable = (struct cli_ac_lsig **)MPOOL_REALLOC(engine->mempool, root->ac_lsigtable, (root->ac_lsigs + 1) * sizeof(struct cli_ac_lsig *));
if (!newtable) {
cli_errmsg("cli_loadldb: Can't realloc root->ac_lsigtable\n");
status = CL_EMEM;
goto done;
}
/* 0 marks no bc, we can't use a pointer to bc, since that is
* realloced/moved during load */
lsig->bc_idx = bc_idx;
newtable[root->ac_lsigs] = lsig;
root->ac_lsigtable = newtable;
tdb.subsigs = subsigs;
/* For logical subsignatures, only store the virname in the lsigtable entry. */
lsig->virname = CLI_MPOOL_VIRNAME(engine->mempool, virname, options & CL_DB_OFFICIAL);
if (NULL == lsig->virname) {
cli_errmsg("cli_loadldb: Can't allocate memory for virname in lsig table\n");
status = CL_EMEM;
goto done;
}
for (i = 0; i < subsigs; i++) {
lsigid[1] = i;
// handle each LDB subsig
ret = readdb_parse_ldb_subsignature(root, virname, tokens[3 + i], "*", lsigid, options, i, subsigs, &tdb);
if (CL_SUCCESS != ret) {
cli_errmsg("cli_loadldb: failed to parse subsignature %d in %s\n", i, virname);
status = ret;
goto done;
}
}
memcpy(&lsig->tdb, &tdb, sizeof(tdb));
/* Increment signature counts */
(*sigs) += 1;
if (bc_idx) {
root->linked_bcs++;
}
root->ac_lsigs++;
status = CL_SUCCESS;
done:
if (CL_SUCCESS != status) {
if (NULL != lsig) {
if (NULL != lsig->virname) {
MPOOL_FREE(engine->mempool, lsig->virname);
}
if (NULL != lsig->u.logic) {
MPOOL_FREE(engine->mempool, lsig->u.logic);
}
MPOOL_FREE(engine->mempool, lsig);
}
if (tdb_initialized) {
FREE_TDB(tdb);
}
}
if (status == CL_BREAK) {
status = CL_SUCCESS;
}
return status;
}
static int cli_loadldb(FILE *fs, struct cl_engine *engine, unsigned int *signo, unsigned int options, struct cli_dbio *dbio, const char *dbname)
{
char buffer[CLI_DEFAULT_LSIG_BUFSIZE + 1], *buffer_cpy = NULL;
unsigned int line = 0, sigs = 0;
int ret;
if (CL_SUCCESS != (ret = cli_initroots(engine, options)))
return ret;
if (engine->ignored) {
if (!(buffer_cpy = cli_malloc(sizeof(buffer)))) {
cli_errmsg("cli_loadldb: Can't allocate memory for buffer_cpy\n");
return CL_EMEM;
}
}
while (cli_dbgets(buffer, sizeof(buffer), fs, dbio)) {
line++;
if (buffer[0] == '#')
continue;
cli_chomp(buffer);
if (engine->ignored)
strcpy(buffer_cpy, buffer);
ret = load_oneldb(buffer,
engine->pua_cats && (options & CL_DB_PUA_MODE) && (options & (CL_DB_PUA_INCLUDE | CL_DB_PUA_EXCLUDE)),
engine, options, dbname, line, &sigs, 0, buffer_cpy, NULL);
if (ret)
break;
if (engine->cb_sigload_progress && ((*signo + sigs) % 10000 == 0)) {
/* Let the progress callback function know how we're doing */
(void)engine->cb_sigload_progress(engine->num_total_signatures, *signo + sigs, engine->cb_sigload_progress_ctx);
}
}
if (engine->ignored)
free(buffer_cpy);
if (!line) {
cli_errmsg("Empty database file\n");
return CL_EMALFDB;
}
if (ret) {
cli_errmsg("Problem parsing database at line %u\n", line);
return ret;
}
if (signo)
*signo += sigs;
return CL_SUCCESS;
}
static int cli_loadcbc(FILE *fs, struct cl_engine *engine, unsigned int *signo, unsigned int options, struct cli_dbio *dbio, const char *dbname)
{
char buf[4096];
int rc, skip = 0;
struct cli_all_bc *bcs = &engine->bcs;
struct cli_bc *bc;
unsigned sigs = 0;
unsigned security_trust = 0;
unsigned i;
/* TODO: virusname have a common prefix, and allow by that */
if ((rc = cli_initroots(engine, options)))
return rc;
if (!(engine->dconf->bytecode & BYTECODE_ENGINE_MASK)) {
return CL_SUCCESS;
}
if (engine->cb_sigload && engine->cb_sigload("cbc", dbname, ~options & CL_DB_OFFICIAL, engine->cb_sigload_ctx)) {
cli_dbgmsg("cli_loadcbc: skipping %s due to callback\n", dbname);
return CL_SUCCESS;
}
if (!(options & CL_DB_BYTECODE_UNSIGNED) && !(options & CL_DB_SIGNED)) {
cli_warnmsg("Only loading signed bytecode, skipping load of unsigned bytecode!\n");
cli_warnmsg("Turn on BytecodeUnsigned/--bytecode-unsigned to enable loading of unsigned bytecode\n");
return CL_SUCCESS;
}
bcs->all_bcs = cli_realloc2(bcs->all_bcs, sizeof(*bcs->all_bcs) * (bcs->count + 1));
if (!bcs->all_bcs) {
cli_errmsg("cli_loadcbc: Can't allocate memory for bytecode entry\n");
return CL_EMEM;
}
bcs->count++;
bc = &bcs->all_bcs[bcs->count - 1];
switch (engine->bytecode_security) {
case CL_BYTECODE_TRUST_SIGNED:
security_trust = !!(options & CL_DB_SIGNED);
break;
default:
security_trust = 0;
}
rc = cli_bytecode_load(bc, fs, dbio, security_trust, options & CL_DB_BYTECODE_STATS);
/* read remainder of DB, needed because cvd.c checks that we read the entire
* file */
while (cli_dbgets(buf, sizeof(buf), fs, dbio)) {
}
if (rc != CL_SUCCESS) {
cli_bytecode_destroy(bc);
cli_errmsg("Unable to load %s bytecode: %s\n", dbname, cl_strerror(rc));
return rc;
}
if (bc->state == bc_skip) {
cli_bytecode_destroy(bc);
bcs->count--;
return CL_SUCCESS;
}
bc->id = bcs->count; /* must set after _load, since load zeroes */
if (engine->bytecode_mode == CL_BYTECODE_MODE_TEST)
cli_infomsg(NULL, "bytecode %u -> %s\n", bc->id, dbname);
if (bc->kind == BC_LOGICAL || bc->lsig) {
unsigned oldsigs = sigs;
if (!bc->lsig) {
cli_errmsg("Bytecode %s has logical kind, but missing logical signature!\n", dbname);
return CL_EMALFDB;
}
cli_dbgmsg("Bytecode %s(%u) has logical signature: %s\n", dbname, bc->id, bc->lsig);
rc = load_oneldb(bc->lsig, 0, engine, options, dbname, 0, &sigs, bcs->count, NULL, &skip);
if (rc != CL_SUCCESS) {
cli_errmsg("Problem parsing logical signature %s for bytecode %s: %s\n",
bc->lsig, dbname, cl_strerror(rc));
return rc;
}
if (skip) {
cli_bytecode_destroy(bc);
bcs->count--;
return CL_SUCCESS;
}
if (sigs == oldsigs) {
/* compiler ensures Engine field in lsig matches the one in bytecode,
* so this should never happen. */
cli_errmsg("Bytecode logical signature skipped, but bytecode itself not?");
return CL_EMALFDB;
}
}
if (bc->kind != BC_LOGICAL) {
if (bc->lsig) {
/* runlsig will only flip a status bit, not report a match,
* when the hooks are executed we only execute the hook if its
* status bit is on */
bc->hook_lsig_id = ++engine->hook_lsig_ids;
}
if (bc->kind >= _BC_START_HOOKS && bc->kind < _BC_LAST_HOOK) {
unsigned hook = bc->kind - _BC_START_HOOKS;
unsigned cnt = ++engine->hooks_cnt[hook];
engine->hooks[hook] = cli_realloc2(engine->hooks[hook],
sizeof(*engine->hooks[0]) * cnt);
if (!engine->hooks[hook]) {
cli_errmsg("Out of memory allocating memory for hook %u", hook);
return CL_EMEM;
}
engine->hooks[hook][cnt - 1] = bcs->count - 1;
} else
switch (bc->kind) {
case BC_STARTUP:
for (i = 0; i < bcs->count - 1; i++)
if (bcs->all_bcs[i].kind == BC_STARTUP) {
struct cli_bc *bc0 = &bcs->all_bcs[i];
cli_errmsg("Can only load 1 BC_STARTUP bytecode, attempted to load 2nd!\n");
cli_warnmsg("Previous BC_STARTUP: %d %d by %s\n",
bc0->id, (uint32_t)bc0->metadata.timestamp,
bc0->metadata.sigmaker ? bc0->metadata.sigmaker : "N/A");
cli_warnmsg("Conflicting BC_STARTUP: %d %d by %s\n",
bc->id, (uint32_t)bc->metadata.timestamp,
bc->metadata.sigmaker ? bc->metadata.sigmaker : "N/A");
return CL_EMALFDB;
}
break;
default:
cli_errmsg("Bytecode: unhandled bytecode kind %u\n", bc->kind);
return CL_EMALFDB;
}
}
if (signo)
*signo += sigs;
return CL_SUCCESS;
}
/* 0 1 2 3 4 5 6 7
* MagicType:Offset:HexSig:Name:RequiredType:DetectedType[:MinFL[:MaxFL]]
*/
#define FTM_TOKENS 8
static int cli_loadftm(FILE *fs, struct cl_engine *engine, unsigned int options, unsigned int internal, struct cli_dbio *dbio)
{
const char *tokens[FTM_TOKENS + 1], *pt;
char buffer[FILEBUFF];
unsigned int line = 0, sigs = 0, tokens_count;
struct cli_ftype *new;
cli_file_t rtype, type;
int ret;
int magictype;
if (CL_SUCCESS != (ret = cli_initroots(engine, options)))
return ret;
while (1) {
if (internal) {
options |= CL_DB_OFFICIAL;
if (!ftypes_int[line])
break;
strncpy(buffer, ftypes_int[line], sizeof(buffer));
buffer[sizeof(buffer) - 1] = '\0';
} else {
if (!cli_dbgets(buffer, FILEBUFF, fs, dbio))
break;
if (buffer[0] == '#')
continue;
cli_chomp(buffer);
}
line++;
tokens_count = cli_strtokenize(buffer, ':', FTM_TOKENS + 1, tokens);
if (tokens_count < 6 || tokens_count > 8) {
ret = CL_EMALFDB;
break;
}
if (tokens_count > 6) { /* min version */
pt = tokens[6];
if (!cli_isnumber(pt)) {
ret = CL_EMALFDB;
break;
}
if ((unsigned int)atoi(pt) > cl_retflevel()) {
cli_dbgmsg("cli_loadftm: File type signature for %s not loaded (required f-level: %u)\n", tokens[3], atoi(pt));
continue;
}
if (tokens_count == 8) { /* max version */
pt = tokens[7];
if (!cli_isnumber(pt)) {
ret = CL_EMALFDB;
break;
}
if ((unsigned int)atoi(pt) < cl_retflevel())
continue;
}
}
rtype = cli_ftcode(tokens[4]);
type = cli_ftcode(tokens[5]);
if (rtype == CL_TYPE_ERROR || type == CL_TYPE_ERROR) {
ret = CL_EMALFDB;
break;
}
if (!cli_isnumber(tokens[0])) {
cli_errmsg("cli_loadftm: Invalid value for the first field\n");
ret = CL_EMALFDB;
break;
}
magictype = atoi(tokens[0]);
if (magictype == 1) { /* A-C */
if (CL_SUCCESS != (ret = cli_add_content_match_pattern(engine->root[0], tokens[3], tokens[2], 0, rtype, type, tokens[1], NULL, options)))
break;
} else if ((magictype == 0) || (magictype == 4)) { /* memcmp() */
if (!cli_isnumber(tokens[1])) {
cli_errmsg("cli_loadftm: Invalid offset\n");
ret = CL_EMALFDB;
break;
}
new = (struct cli_ftype *)MPOOL_MALLOC(engine->mempool, sizeof(struct cli_ftype));
if (!new) {
ret = CL_EMEM;
break;
}
new->type = type;
new->offset = atoi(tokens[1]);
new->magic = (unsigned char *)CLI_MPOOL_HEX2STR(engine->mempool, tokens[2]);
if (!new->magic) {
cli_errmsg("cli_loadftm: Can't decode the hex string\n");
ret = CL_EMALFDB;
MPOOL_FREE(engine->mempool, new);
break;
}
new->length = (uint16_t)strlen(tokens[2]) / 2;
new->tname = CLI_MPOOL_STRDUP(engine->mempool, tokens[3]);
if (!new->tname) {
MPOOL_FREE(engine->mempool, new->magic);
MPOOL_FREE(engine->mempool, new);
ret = CL_EMEM;
break;
}
/* files => ftypes, partitions => ptypes */
if (magictype == 4) {
new->next = engine->ptypes;
engine->ptypes = new;
} else {
new->next = engine->ftypes;
engine->ftypes = new;
}
} else {
cli_dbgmsg("cli_loadftm: Unsupported mode %u\n", atoi(tokens[0]));
continue;
}
sigs++;
}
if (ret) {
cli_errmsg("Problem parsing %s filetype database at line %u\n", internal ? "built-in" : "external", line);
return ret;
}
if (!sigs) {
cli_errmsg("Empty %s filetype database\n", internal ? "built-in" : "external");
return CL_EMALFDB;
}
cli_dbgmsg("Loaded %u filetype definitions\n", sigs);
return CL_SUCCESS;
}
#define INFO_NSTR "11088894983048545473659556106627194923928941791795047620591658697413581043322715912172496806525381055880964520618400224333320534660299233983755341740679502866829909679955734391392668378361221524205396631090105151641270857277080310734320951653700508941717419168723942507890702904702707587451621691050754307850383399865346487203798464178537392211402786481359824461197231102895415093770394216666324484593935762408468516826633192140826667923494822045805347809932848454845886971706424360558667862775876072059437703365380209101697738577515476935085469455279994113145977994084618328482151013142393373316337519977244732747977"
#define INFO_ESTR "100002049"
#define INFO_TOKENS 3
static int cli_loadinfo(FILE *fs, struct cl_engine *engine, unsigned int options, struct cli_dbio *dbio)
{
const char *tokens[INFO_TOKENS + 1];
char buffer[FILEBUFF];
unsigned int line = 0, tokens_count, len;
char hash[32];
struct cli_dbinfo *last = NULL, *new;
int ret = CL_SUCCESS, dsig = 0;
void *ctx;
if (!dbio) {
cli_errmsg("cli_loadinfo: .info files can only be loaded from within database container files\n");
return CL_EMALFDB;
}
ctx = cl_hash_init("sha256");
if (!(ctx))
return CL_EMALFDB;
while (cli_dbgets(buffer, FILEBUFF, fs, dbio)) {
line++;
if (!(options & CL_DB_UNSIGNED) && !strncmp(buffer, "DSIG:", 5)) {
dsig = 1;
cl_finish_hash(ctx, hash);
if (cli_versig2((unsigned char *)hash, buffer + 5, INFO_NSTR, INFO_ESTR) != CL_SUCCESS) {
cli_errmsg("cli_loadinfo: Incorrect digital signature\n");
ret = CL_EMALFDB;
}
break;
}
len = strlen(buffer);
if (!len) {
buffer[len] = '\n';
buffer[len + 1] = 0;
} else {
if (dbio->usebuf && buffer[len - 1] != '\n' && len + 1 < FILEBUFF) {
/* cli_dbgets in buffered mode strips \n */
buffer[len] = '\n';
buffer[len + 1] = 0;
}
}
cl_update_hash(ctx, buffer, strlen(buffer));
cli_chomp(buffer);
if (!strncmp("ClamAV-VDB:", buffer, 11)) {
if (engine->dbinfo) { /* shouldn't be initialized at this point */
cli_errmsg("cli_loadinfo: engine->dbinfo already initialized\n");
ret = CL_EMALFDB;
break;
}
last = engine->dbinfo = (struct cli_dbinfo *)MPOOL_CALLOC(engine->mempool, 1, sizeof(struct cli_bm_patt));
if (!engine->dbinfo) {
ret = CL_EMEM;
break;
}
engine->dbinfo->cvd = cl_cvdparse(buffer);
if (!engine->dbinfo->cvd) {
cli_errmsg("cli_loadinfo: Can't parse header entry\n");
ret = CL_EMALFDB;
break;
}
continue;
}
if (!last) {
cli_errmsg("cli_loadinfo: Incorrect file format\n");
ret = CL_EMALFDB;
break;
}
tokens_count = cli_strtokenize(buffer, ':', INFO_TOKENS + 1, tokens);
if (tokens_count != INFO_TOKENS) {
ret = CL_EMALFDB;
break;
}
new = (struct cli_dbinfo *)MPOOL_CALLOC(engine->mempool, 1, sizeof(struct cli_dbinfo));
if (!new) {
ret = CL_EMEM;
break;
}
new->name = CLI_MPOOL_STRDUP(engine->mempool, tokens[0]);
if (!new->name) {
MPOOL_FREE(engine->mempool, new);
ret = CL_EMEM;
break;
}
if (!cli_isnumber(tokens[1])) {
cli_errmsg("cli_loadinfo: Invalid value in the size field\n");
MPOOL_FREE(engine->mempool, new->name);
MPOOL_FREE(engine->mempool, new);
ret = CL_EMALFDB;
break;
}
new->size = atoi(tokens[1]);
if (strlen(tokens[2]) != 64 || !(new->hash = CLI_MPOOL_HEX2STR(engine->mempool, tokens[2]))) {
cli_errmsg("cli_loadinfo: Malformed SHA256 string at line %u\n", line);
MPOOL_FREE(engine->mempool, new->name);
MPOOL_FREE(engine->mempool, new);
ret = CL_EMALFDB;
break;
}
last->next = new;
last = new;
}
if (!(options & CL_DB_UNSIGNED) && !dsig) {
cli_errmsg("cli_loadinfo: Digital signature not found\n");
return CL_EMALFDB;
}
if (ret) {
cli_errmsg("cli_loadinfo: Problem parsing database at line %u\n", line);
return ret;
}
return CL_SUCCESS;
}
#define IGN_MAX_TOKENS 3
static int cli_loadign(FILE *fs, struct cl_engine *engine, unsigned int options, struct cli_dbio *dbio)
{
const char *tokens[IGN_MAX_TOKENS + 1], *signame, *hash = NULL;
char buffer[FILEBUFF];
unsigned int line = 0, tokens_count, len;
struct cli_bm_patt *new;
int ret = CL_SUCCESS;
UNUSEDPARAM(options);
if (!engine->ignored) {
engine->ignored = (struct cli_matcher *)MPOOL_CALLOC(engine->mempool, 1, sizeof(struct cli_matcher));
if (!engine->ignored)
return CL_EMEM;
#ifdef USE_MPOOL
engine->ignored->mempool = engine->mempool;
#endif
if (CL_SUCCESS != (ret = cli_bm_init(engine->ignored))) {
cli_errmsg("cli_loadign: Can't initialise AC pattern matcher\n");
return ret;
}
}
while (cli_dbgets(buffer, FILEBUFF, fs, dbio)) {
line++;
if (buffer[0] == '#')
continue;
cli_chomp(buffer);
tokens_count = cli_strtokenize(buffer, ':', IGN_MAX_TOKENS + 1, tokens);
if (tokens_count > IGN_MAX_TOKENS) {
ret = CL_EMALFDB;
break;
}
if (tokens_count == 1) {
signame = buffer;
} else if (tokens_count == 2) {
signame = tokens[0];
hash = tokens[1];
} else { /* old mode */
signame = tokens[2];
}
if (!(len = strlen(signame))) {
cli_errmsg("cli_loadign: No signature name provided\n");
ret = CL_EMALFDB;
break;
}
if (len < 3) {
int pad = 3 - len;
/* patch-up for Boyer-Moore minimum length of 3: pad with spaces */
if (signame != buffer) {
strncpy(buffer, signame, len);
signame = buffer;
}
buffer[3] = '\0';
while (pad > 0)
buffer[3 - pad--] = '\x20';
len = 3;
}
new = (struct cli_bm_patt *)MPOOL_CALLOC(engine->mempool, 1, sizeof(struct cli_bm_patt));
if (!new) {
ret = CL_EMEM;
break;
}
new->pattern = (unsigned char *)CLI_MPOOL_STRDUP(engine->mempool, signame);
if (!new->pattern) {
MPOOL_FREE(engine->mempool, new);
ret = CL_EMEM;
break;
}
if (hash) {
if (strlen(hash) != 32 || !(new->virname = CLI_MPOOL_HEX2STR(engine->mempool, hash))) {
cli_errmsg("cli_loadign: Malformed MD5 string at line %u\n", line);
MPOOL_FREE(engine->mempool, new->pattern);
MPOOL_FREE(engine->mempool, new);
ret = CL_EMALFDB;
break;
}
}
new->length = len;
new->boundary |= BM_BOUNDARY_EOL;
if (CL_SUCCESS != (ret = cli_bm_addpatt(engine->ignored, new, "0"))) {
if (hash)
MPOOL_FREE(engine->mempool, new->virname);
MPOOL_FREE(engine->mempool, new->pattern);
MPOOL_FREE(engine->mempool, new);
break;
}
}
if (ret) {
cli_errmsg("cli_loadign: Problem parsing database at line %u\n", line);
return ret;
}
return CL_SUCCESS;
}
#define MD5_HDB 0
#define MD5_MDB 1
#define MD5_FP 2
#define MD5_IMP 3
#define MD5_TOKENS 5
static int cli_loadhash(FILE *fs, struct cl_engine *engine, unsigned int *signo, unsigned int mode, unsigned int options, struct cli_dbio *dbio, const char *dbname)
{
const char *tokens[MD5_TOKENS + 1];
char buffer[FILEBUFF], *buffer_cpy = NULL;
const char *pt, *virname;
int ret = CL_SUCCESS;
unsigned int size_field = 1, md5_field = 0, line = 0, sigs = 0, tokens_count;
unsigned int req_fl = 0;
struct cli_matcher *db;
unsigned long size;
if (mode == MD5_MDB) {
size_field = 0;
md5_field = 1;
db = engine->hm_mdb;
} else if (mode == MD5_HDB)
db = engine->hm_hdb;
else if (mode == MD5_IMP)
db = engine->hm_imp;
else
db = engine->hm_fp;
if (!db) {
if (!(db = MPOOL_CALLOC(engine->mempool, 1, sizeof(*db))))
return CL_EMEM;
#ifdef USE_MPOOL
db->mempool = engine->mempool;
#endif
if (mode == MD5_HDB)
engine->hm_hdb = db;
else if (mode == MD5_MDB)
engine->hm_mdb = db;
else if (mode == MD5_IMP)
engine->hm_imp = db;
else
engine->hm_fp = db;
}
if (engine->ignored)
if (!(buffer_cpy = cli_malloc(FILEBUFF))) {
cli_errmsg("cli_loadhash: Can't allocate memory for buffer_cpy\n");
return CL_EMEM;
}
while (cli_dbgets(buffer, FILEBUFF, fs, dbio)) {
line++;
if (buffer[0] == '#')
continue;
cli_chomp(buffer);
if (engine->ignored)
strcpy(buffer_cpy, buffer);
tokens_count = cli_strtokenize(buffer, ':', MD5_TOKENS + 1, tokens);
if (tokens_count < 3) {
ret = CL_EMALFDB;
break;
}
if (tokens_count > MD5_TOKENS - 2) {
req_fl = atoi(tokens[MD5_TOKENS - 2]);
if (tokens_count > MD5_TOKENS) {
ret = CL_EMALFDB;
break;
}
if (cl_retflevel() < req_fl)
continue;
if (tokens_count == MD5_TOKENS) {
int max_fl = atoi(tokens[MD5_TOKENS - 1]);
if (cl_retflevel() > (unsigned int)max_fl)
continue;
}
}
if (strcmp(tokens[size_field], "*")) {
size = strtoul(tokens[size_field], (char **)&pt, 10);
if (*pt || !size || size >= 0xffffffff) {
cli_errmsg("cli_loadhash: Invalid value for the size field\n");
ret = CL_EMALFDB;
break;
}
} else {
size = 0;
// The wildcard feature was added in FLEVEL 73, so for backwards
// compatibility with older clients, ensure that a minimum FLEVEL
// is specified. This check doesn't apply to .imp rules, though,
// since this rule category wasn't introduced until FLEVEL 90, and
// has always supported wildcard usage in rules.
if (mode != MD5_IMP && ((tokens_count < MD5_TOKENS - 1) || (req_fl < 73))) {
cli_errmsg("cli_loadhash: Minimum FLEVEL field must be at least 73 for wildcard size hash signatures."
" For reference, running FLEVEL is %d\n",
cl_retflevel());
ret = CL_EMALFDB;
break;
}
}
pt = tokens[2]; /* virname */
if (engine->pua_cats && (options & CL_DB_PUA_MODE) && (options & (CL_DB_PUA_INCLUDE | CL_DB_PUA_EXCLUDE)))
if (cli_chkpua(pt, engine->pua_cats, options))
continue;
if (engine->ignored && cli_chkign(engine->ignored, pt, buffer_cpy))
continue;
if (engine->cb_sigload) {
const char *dot = strchr(dbname, '.');
if (!dot)
dot = dbname;
else
dot++;
if (engine->cb_sigload(dot, pt, ~options & CL_DB_OFFICIAL, engine->cb_sigload_ctx)) {
cli_dbgmsg("cli_loadhash: skipping %s (%s) due to callback\n", pt, dot);
continue;
}
}
virname = CLI_MPOOL_VIRNAME(engine->mempool, pt, options & CL_DB_OFFICIAL);
if (!virname) {
ret = CL_EMALFDB;
break;
}
if (CL_SUCCESS != (ret = hm_addhash_str(db, tokens[md5_field], size, virname))) {
cli_errmsg("cli_loadhash: Malformed hash string at line %u\n", line);
MPOOL_FREE(engine->mempool, (void *)virname);
break;
}
sigs++;
if (engine->cb_sigload_progress && ((*signo + sigs) % 10000 == 0)) {
/* Let the progress callback function know how we're doing */
(void)engine->cb_sigload_progress(engine->num_total_signatures, *signo + sigs, engine->cb_sigload_progress_ctx);
}
}
if (engine->ignored)
free(buffer_cpy);
if (!line) {
cli_errmsg("cli_loadhash: Empty database file\n");
return CL_EMALFDB;
}
if (ret) {
cli_errmsg("cli_loadhash: Problem parsing database at line %u\n", line);
return ret;
}
if (signo)
*signo += sigs;
return CL_SUCCESS;
}
#define MD_TOKENS 9
static int cli_loadmd(FILE *fs, struct cl_engine *engine, unsigned int *signo, int type, unsigned int options, struct cli_dbio *dbio, const char *dbname)
{
const char *tokens[MD_TOKENS + 1];
char buffer[FILEBUFF], *buffer_cpy = NULL;
unsigned int line = 0, sigs = 0, tokens_count;
int ret = CL_SUCCESS;
struct cli_cdb *new;
UNUSEDPARAM(dbname);
if (engine->ignored)
if (!(buffer_cpy = cli_malloc(FILEBUFF))) {
cli_errmsg("cli_loadmd: Can't allocate memory for buffer_cpy\n");
return CL_EMEM;
}
while (cli_dbgets(buffer, FILEBUFF, fs, dbio)) {
line++;
if (buffer[0] == '#')
continue;
cli_chomp(buffer);
if (engine->ignored)
strcpy(buffer_cpy, buffer);
tokens_count = cli_strtokenize(buffer, ':', MD_TOKENS + 1, tokens);
if (tokens_count != MD_TOKENS) {
ret = CL_EMALFDB;
break;
}
if (strcmp(tokens[1], "*") && !cli_isnumber(tokens[1])) {
cli_errmsg("cli_loadmd: Invalid value for the 'encrypted' field\n");
ret = CL_EMALFDB;
break;
}
if (strcmp(tokens[3], "*") && !cli_isnumber(tokens[3])) {
cli_errmsg("cli_loadmd: Invalid value for the 'original size' field\n");
ret = CL_EMALFDB;
break;
}
if (strcmp(tokens[4], "*") && !cli_isnumber(tokens[4])) {
cli_errmsg("cli_loadmd: Invalid value for the 'compressed size' field\n");
ret = CL_EMALFDB;
break;
}
if (strcmp(tokens[6], "*") && !cli_isnumber(tokens[6])) {
cli_errmsg("cli_loadmd: Invalid value for the 'compression method' field\n");
ret = CL_EMALFDB;
break;
}
if (strcmp(tokens[7], "*") && !cli_isnumber(tokens[7])) {
cli_errmsg("cli_loadmd: Invalid value for the 'file number' field\n");
ret = CL_EMALFDB;
break;
}
if (strcmp(tokens[8], "*") && !cli_isnumber(tokens[8])) {
cli_errmsg("cli_loadmd: Invalid value for the 'max depth' field\n");
ret = CL_EMALFDB;
break;
}
new = (struct cli_cdb *)MPOOL_CALLOC(engine->mempool, 1, sizeof(struct cli_cdb));
if (!new) {
ret = CL_EMEM;
break;
}
new->virname = CLI_MPOOL_VIRNAME(engine->mempool, tokens[0], options & CL_DB_OFFICIAL);
if (!new->virname) {
MPOOL_FREE(engine->mempool, new);
ret = CL_EMEM;
break;
}
new->ctype = (type == 1) ? CL_TYPE_ZIP : CL_TYPE_RAR;
if (engine->ignored && cli_chkign(engine->ignored, new->virname, buffer /*_cpy*/)) {
MPOOL_FREE(engine->mempool, new->virname);
MPOOL_FREE(engine->mempool, new);
continue;
}
if (engine->cb_sigload && engine->cb_sigload("md", new->virname, ~options & CL_DB_OFFICIAL, engine->cb_sigload_ctx)) {
cli_dbgmsg("cli_loadmd: skipping %s due to callback\n", new->virname);
MPOOL_FREE(engine->mempool, new->virname);
MPOOL_FREE(engine->mempool, new);
continue;
}
new->encrypted = strcmp(tokens[1], "*") ? atoi(tokens[1]) : 2;
if (strcmp(tokens[2], "*") && cli_regcomp(&new->name, tokens[2], REG_EXTENDED | REG_NOSUB)) {
cli_errmsg("cli_loadmd: Can't compile regular expression %s in signature for %s\n", tokens[2], tokens[0]);
MPOOL_FREE(engine->mempool, new->virname);
MPOOL_FREE(engine->mempool, new);
ret = CL_EMEM;
break;
}
new->csize[0] = new->csize[1] = CLI_OFF_ANY;
if (!strcmp(tokens[3], "*"))
new->fsizer[0] = new->fsizer[1] = CLI_OFF_ANY;
else
new->fsizer[0] = new->fsizer[1] = atoi(tokens[3]);
if (!strcmp(tokens[4], "*"))
new->fsizec[0] = new->fsizec[1] = CLI_OFF_ANY;
else
new->fsizec[0] = new->fsizec[1] = atoi(tokens[4]);
if (strcmp(tokens[5], "*")) {
new->res1 = cli_hex2num(tokens[5]);
if (new->res1 == -1) {
MPOOL_FREE(engine->mempool, new->virname);
MPOOL_FREE(engine->mempool, new);
if (new->name.re_magic)
cli_regfree(&new->name);
ret = CL_EMALFDB;
break;
}
}
/* tokens[6] - not used */
new->filepos[0] = new->filepos[1] = strcmp(tokens[7], "*") ? (unsigned int)atoi(tokens[7]) : (unsigned int)CLI_OFF_ANY;
/* tokens[8] - not used */
new->next = engine->cdb;
engine->cdb = new;
sigs++;
}
if (engine->ignored)
free(buffer_cpy);
if (!line) {
cli_errmsg("Empty database file\n");
return CL_EMALFDB;
}
if (ret) {
cli_errmsg("Problem parsing database at line %d\n", line);
return ret;
}
if (signo)
*signo += sigs;
return CL_SUCCESS;
}
/* 0 1 2 3 4 5 6 7 8 9 10 11
* VirusName:ContainerType:ContainerSize:FileNameREGEX:FileSizeInContainer:FileSizeReal:IsEncrypted:FilePos:Res1:Res2[:MinFL[:MaxFL]]
*/
#define CDB_TOKENS 12
static int cli_loadcdb(FILE *fs, struct cl_engine *engine, unsigned int *signo, unsigned int options, struct cli_dbio *dbio)
{
const char *tokens[CDB_TOKENS + 1];
char buffer[FILEBUFF], *buffer_cpy = NULL;
unsigned int line = 0, sigs = 0, tokens_count, n0, n1;
int ret = CL_SUCCESS;
struct cli_cdb *new;
if (engine->ignored)
if (!(buffer_cpy = cli_malloc(FILEBUFF))) {
cli_errmsg("cli_loadcdb: Can't allocate memory for buffer_cpy\n");
return CL_EMEM;
}
while (cli_dbgets(buffer, FILEBUFF, fs, dbio)) {
line++;
if (buffer[0] == '#')
continue;
cli_chomp(buffer);
if (engine->ignored)
strcpy(buffer_cpy, buffer);
tokens_count = cli_strtokenize(buffer, ':', CDB_TOKENS + 1, tokens);
if (tokens_count > CDB_TOKENS || tokens_count < CDB_TOKENS - 2) {
ret = CL_EMALFDB;
break;
}
if (tokens_count > 10) { /* min version */
if (!cli_isnumber(tokens[10])) {
ret = CL_EMALFDB;
break;
}
if ((unsigned int)atoi(tokens[10]) > cl_retflevel()) {
cli_dbgmsg("cli_loadcdb: Container signature for %s not loaded (required f-level: %u)\n", tokens[0], atoi(tokens[10]));
continue;
}
if (tokens_count == CDB_TOKENS) { /* max version */
if (!cli_isnumber(tokens[11])) {
ret = CL_EMALFDB;
break;
}
if ((unsigned int)atoi(tokens[11]) < cl_retflevel())
continue;
}
}
new = (struct cli_cdb *)MPOOL_CALLOC(engine->mempool, 1, sizeof(struct cli_cdb));
if (!new) {
ret = CL_EMEM;
break;
}
new->virname = CLI_MPOOL_VIRNAME(engine->mempool, tokens[0], options & CL_DB_OFFICIAL);
if (!new->virname) {
MPOOL_FREE(engine->mempool, new);
ret = CL_EMEM;
break;
}
if (engine->ignored && cli_chkign(engine->ignored, new->virname, buffer /*_cpy*/)) {
MPOOL_FREE(engine->mempool, new->virname);
MPOOL_FREE(engine->mempool, new);
continue;
}
if (engine->cb_sigload && engine->cb_sigload("cdb", new->virname, ~options & CL_DB_OFFICIAL, engine->cb_sigload_ctx)) {
cli_dbgmsg("cli_loadcdb: skipping %s due to callback\n", new->virname);
MPOOL_FREE(engine->mempool, new->virname);
MPOOL_FREE(engine->mempool, new);
continue;
}
if (!strcmp(tokens[1], "*")) {
new->ctype = CL_TYPE_ANY;
} else if ((new->ctype = cli_ftcode(tokens[1])) == CL_TYPE_ERROR) {
cli_errmsg("cli_loadcdb: Unknown container type %s in signature for %s, skipping\n", tokens[1], tokens[0]);
ret = CL_EMALFDB;
MPOOL_FREE(engine->mempool, new->virname);
MPOOL_FREE(engine->mempool, new);
break;
}
if (strcmp(tokens[3], "*") && cli_regcomp(&new->name, tokens[3], REG_EXTENDED | REG_NOSUB)) {
cli_errmsg("cli_loadcdb: Can't compile regular expression %s in signature for %s\n", tokens[3], tokens[0]);
MPOOL_FREE(engine->mempool, new->virname);
MPOOL_FREE(engine->mempool, new);
ret = CL_EMEM;
break;
}
#define CDBRANGE(token_str, dest) \
if (strcmp(token_str, "*")) { \
if (strchr(token_str, '-')) { \
if (sscanf(token_str, "%u-%u", &n0, &n1) != 2) { \
ret = CL_EMALFDB; \
} else { \
dest[0] = n0; \
dest[1] = n1; \
} \
} else { \
if (!cli_isnumber(token_str)) \
ret = CL_EMALFDB; \
else \
dest[0] = dest[1] = (unsigned int)atoi(token_str); \
} \
if (ret != CL_SUCCESS) { \
cli_errmsg("cli_loadcdb: Invalid value %s in signature for %s\n", \
token_str, tokens[0]); \
if (new->name.re_magic) \
cli_regfree(&new->name); \
MPOOL_FREE(engine->mempool, new->virname); \
MPOOL_FREE(engine->mempool, new); \
ret = CL_EMEM; \
break; \
} \
} else { \
dest[0] = dest[1] = CLI_OFF_ANY; \
}
CDBRANGE(tokens[2], new->csize);
CDBRANGE(tokens[4], new->fsizec);
CDBRANGE(tokens[5], new->fsizer);
CDBRANGE(tokens[7], new->filepos);
if (!strcmp(tokens[6], "*")) {
new->encrypted = 2;
} else {
if (strcmp(tokens[6], "0") && strcmp(tokens[6], "1")) {
cli_errmsg("cli_loadcdb: Invalid encryption flag value in signature for %s\n", tokens[0]);
if (new->name.re_magic)
cli_regfree(&new->name);
MPOOL_FREE(engine->mempool, new->virname);
MPOOL_FREE(engine->mempool, new);
ret = CL_EMEM;
break;
}
new->encrypted = *tokens[6] - 0x30;
}
if (strcmp(tokens[9], "*")) {
new->res2 = CLI_MPOOL_STRDUP(engine->mempool, tokens[9]);
if (!new->res2) {
cli_errmsg("cli_loadcdb: Can't allocate memory for res2 in signature for %s\n", tokens[0]);
if (new->name.re_magic)
cli_regfree(&new->name);
MPOOL_FREE(engine->mempool, new->virname);
MPOOL_FREE(engine->mempool, new);
ret = CL_EMEM;
break;
}
}
new->next = engine->cdb;
engine->cdb = new;
sigs++;
}
if (engine->ignored)
free(buffer_cpy);
if (!line) {
cli_errmsg("Empty database file\n");
return CL_EMALFDB;
}
if (ret) {
cli_errmsg("Problem parsing database at line %u\n", line);
return ret;
}
if (signo)
*signo += sigs;
return CL_SUCCESS;
}
/*convert the ascii sha1 in 'token' to binary and store in
* hashDest.
*/
static cl_error_t set_sha1(const char *const token, uint8_t hashDest[SHA1_HASH_SIZE],
const char *const varname, uint32_t line)
{
cl_error_t ret = CL_SUCCESS;
uint8_t hash[SHA1_HASH_SIZE] = {0};
if ((2 * SHA1_HASH_SIZE) != strlen(token)) {
cli_errmsg("cli_loadcrt: line %u: %s is not the appropriate length for a SHA1 Hash\n", (unsigned int)line, varname);
ret = CL_EMALFDB;
goto done;
}
if (0 > cli_hex2str_to(token, (char *)hash, strlen(token))) {
cli_errmsg("cli_loadcrt: line %u: Cannot convert %s to binary string\n", (unsigned int)line, varname);
ret = CL_EMALFDB;
goto done;
}
memcpy(hashDest, hash, SHA1_HASH_SIZE);
done:
return ret;
}
/*
* name;trusted;subject;serial;pubkey;exp;codesign;timesign;certsign;notbefore;comment[;minFL[;maxFL]]
* Name and comment are ignored. They're just for the end user.
* Exponent is ignored for now and hardcoded to \x01\x00\x01.
*/
#define CRT_TOKENS 13
static int cli_loadcrt(FILE *fs, struct cl_engine *engine, struct cli_dbio *dbio)
{
char buffer[FILEBUFF];
char *tokens[CRT_TOKENS + 1];
size_t line = 0, tokens_count;
cli_crt ca;
int ret = CL_SUCCESS;
char *pubkey = NULL;
const uint8_t exp[] = "\x01\x00\x01";
if (!(engine->dconf->pe & PE_CONF_CERTS)) {
cli_dbgmsg("cli_loadcrt: Ignoring .crb sigs due to DCONF configuration\n");
return ret;
}
if (engine->engine_options & ENGINE_OPTIONS_DISABLE_PE_CERTS) {
cli_dbgmsg("cli_loadcrt: Ignoring .crb sigs due to engine options\n");
return ret;
}
cli_crt_init(&ca);
memset(ca.issuer, 0xca, sizeof(ca.issuer));
while (cli_dbgets(buffer, FILEBUFF, fs, dbio)) {
line++;
if (buffer[0] == '#')
continue;
cli_chomp(buffer);
if (!strlen(buffer))
continue;
tokens_count = cli_strtokenize(buffer, ';', CRT_TOKENS + 1, (const char **)tokens);
if (tokens_count > CRT_TOKENS || tokens_count < CRT_TOKENS - 2) {
cli_errmsg("cli_loadcrt: line %u: Invalid number of tokens: %u\n", (unsigned int)line, (unsigned int)tokens_count);
ret = CL_EMALFDB;
goto done;
}
if (tokens_count > CRT_TOKENS - 2) {
if (!cli_isnumber(tokens[CRT_TOKENS - 2])) {
cli_errmsg("cli_loadcrt: line %u: Invalid minimum feature level\n", (unsigned int)line);
ret = CL_EMALFDB;
goto done;
}
if ((unsigned int)atoi(tokens[CRT_TOKENS - 2]) > cl_retflevel()) {
cli_dbgmsg("cli_loadcrt: Cert %s not loaded (required f-level: %u)\n", tokens[0], cl_retflevel());
continue;
}
if (tokens_count == CRT_TOKENS) {
if (!cli_isnumber(tokens[CRT_TOKENS - 1])) {
cli_errmsg("cli_loadcrt: line %u: Invalid maximum feature level\n", (unsigned int)line);
ret = CL_EMALFDB;
goto done;
}
if ((unsigned int)atoi(tokens[CRT_TOKENS - 1]) < cl_retflevel()) {
cli_dbgmsg("cli_ladcrt: Cert %s not loaded (maximum f-level: %s)\n", tokens[0], tokens[CRT_TOKENS - 1]);
continue;
}
}
}
switch (tokens[1][0]) {
case '1':
ca.isBlocked = 0;
break;
case '0':
ca.isBlocked = 1;
break;
default:
cli_errmsg("cli_loadcrt: line %u: Invalid trust specification. Expected 0 or 1\n", (unsigned int)line);
ret = CL_EMALFDB;
goto done;
}
if (strlen(tokens[3])) {
ret = set_sha1(tokens[3], ca.serial, "serial", line);
if (CL_SUCCESS != ret) {
goto done;
}
} else {
ca.ignore_serial = 1;
memset(ca.serial, 0xca, sizeof(ca.serial));
}
if (engine->engine_options & ENGINE_OPTIONS_PE_DUMPCERTS) {
cli_dbgmsg("cli_loadcrt: subject: %s\n", tokens[2]);
cli_dbgmsg("cli_loadcrt: public key: %s\n", tokens[4]);
}
ret = set_sha1(tokens[2], ca.subject, "subject", line);
if (CL_SUCCESS != ret) {
goto done;
}
pubkey = cli_hex2str(tokens[4]);
if (!pubkey) {
cli_errmsg("cli_loadcrt: line %u: Cannot convert public key to binary string\n", (unsigned int)line);
ret = CL_EMALFDB;
goto done;
}
fp_read_unsigned_bin(&(ca.n), (const unsigned char *)pubkey, strlen(tokens[4]) / 2);
fp_read_unsigned_bin(&(ca.e), exp, sizeof(exp) - 1);
switch (tokens[6][0]) {
case '1':
ca.codeSign = 1;
break;
case '0':
ca.codeSign = 0;
break;
default:
cli_errmsg("cli_loadcrt: line %u: Invalid code sign specification. Expected 0 or 1\n", (unsigned int)line);
ret = CL_EMALFDB;
goto done;
}
switch (tokens[7][0]) {
case '1':
ca.timeSign = 1;
break;
case '0':
ca.timeSign = 0;
break;
default:
cli_errmsg("cli_loadcrt: line %u: Invalid time sign specification. Expected 0 or 1\n", (unsigned int)line);
ret = CL_EMALFDB;
goto done;
}
switch (tokens[8][0]) {
case '1':
ca.certSign = 1;
break;
case '0':
ca.certSign = 0;
break;
default:
cli_errmsg("cli_loadcrt: line %u: Invalid cert sign specification. Expected 0 or 1\n", (unsigned int)line);
ret = CL_EMALFDB;
goto done;
}
if (strlen(tokens[0]))
ca.name = tokens[0];
else
ca.name = NULL;
if (strlen(tokens[9]))
ca.not_before = atoi(tokens[8]);
ca.not_after = (-1U) >> 1;
ca.hashtype = CLI_HASHTYPE_ANY;
crtmgr_add(&(engine->cmgr), &ca);
FREE(pubkey);
}
done:
FREE(pubkey);
cli_dbgmsg("Number of certs: %d\n", engine->cmgr.items);
cli_crt_clear(&ca);
return ret;
}
static int cli_loadmscat(FILE *fs, const char *dbname, struct cl_engine *engine, unsigned int options, struct cli_dbio *dbio)
{
fmap_t *map;
UNUSEDPARAM(options);
UNUSEDPARAM(dbio);
/* If loading in signatures stored in .cat files is disabled, then skip.
* If Authenticoded signature parsing in general is disabled, then also
* skip. */
if (!(engine->dconf->pe & PE_CONF_CATALOG) || !(engine->dconf->pe & PE_CONF_CERTS)) {
cli_dbgmsg("cli_loadmscat: Ignoring .cat sigs due to DCONF configuration\n");
return 0;
}
if (engine->engine_options & ENGINE_OPTIONS_DISABLE_PE_CERTS) {
cli_dbgmsg("cli_loadmscat: Ignoring .cat sigs due to engine options\n");
return 0;
}
if (!(map = fmap(fileno(fs), 0, 0, dbname))) {
cli_dbgmsg("Can't map cat: %s\n", dbname);
return 0;
}
if (asn1_load_mscat(map, engine)) {
cli_dbgmsg("Failed to load certificates from cat: %s\n", dbname);
}
funmap(map);
return 0;
}
static int cli_loadopenioc(FILE *fs, const char *dbname, struct cl_engine *engine, unsigned int options)
{
int rc;
rc = openioc_parse(dbname, fileno(fs), engine, options);
if (rc != CL_SUCCESS)
return CL_EMALFDB;
return rc;
}
#ifdef HAVE_YARA
#define YARA_DEBUG 1
#if (YARA_DEBUG == 2)
#define cli_yaramsg(...) cli_errmsg(__VA_ARGS__)
#elif (YARA_DEBUG == 1)
#define cli_yaramsg(...) cli_dbgmsg(__VA_ARGS__)
#else
#define cli_yaramsg(...)
#endif
static char *parse_yara_hex_string(YR_STRING *string, int *ret);
static char *parse_yara_hex_string(YR_STRING *string, int *ret)
{
char *res, *str, *ovr;
size_t slen, reslen = 0, i, j;
if (!(string) || !(string->string)) {
if (ret) *ret = CL_ENULLARG;
return NULL;
}
if (!STRING_IS_HEX(string)) {
if (ret) *ret = CL_EARG;
return NULL;
}
str = (char *)(string->string);
if ((slen = string->length) == 0) {
if (ret) *ret = CL_EARG;
return NULL;
}
str = strchr(str, '{') + 1;
for (i = 0; i < slen - 1; i++) {
switch (str[i]) {
case ' ':
case '\t':
case '\r':
case '\n':
case '}': /* end of hex string */
break;
default:
reslen++;
break;
}
}
reslen++;
res = cli_calloc(reslen, 1);
if (!(res)) {
if (ret) *ret = CL_EMEM;
return NULL;
}
for (i = 0, j = 0; i < slen - 1 && j < reslen; i++) {
switch (str[i]) {
case ' ':
case '\t':
case '\r':
case '\n':
case '}':
break;
case '[':
/* unbounded range check */
if ((i + 2 < slen - 1) && (str[i + 1] == '-') && (str[i + 2] == ']')) {
res[j++] = '*';
i += 2;
} else {
res[j++] = '{';
}
break;
case ']':
res[j++] = '}';
break;
default:
res[j++] = str[i];
break;
}
}
/* FIXME: removing this code because anchored bytes are not sufficiently
general for the purposes of yara rule to ClamAV sig conversions.
1. ClamAV imposes a maximum value for the upper range limit of 32:
#define AC_CH_MAXDIST 32
Values larger cause an error in matcher-ac.c
2. If the upper range values is not present, ClamAV sets the missing
range value to be equal to the lower range value. This changes the
semantic of yara jumps.
*/
#ifdef YARA_ANCHOR_SUPPORT
/* backward anchor overwrite, 2 (hex chars in one byte) */
if ((ovr = strchr(res, '{')) && ((ovr - res) == 2)) {
*ovr = '[';
if ((ovr = strchr(ovr, '}')))
*ovr = ']';
else {
free(res);
if (ret) *ret = CL_EMALFDB;
return NULL;
}
}
/* forward anchor overwrite, 2 (hex chars in one byte) +1 (NULL char) */
if ((ovr = strrchr(res, '}')) && ((res + j - ovr) == 3)) {
*ovr = ']';
if ((ovr = strrchr(res, '{')))
*ovr = '[';
else {
free(res);
if (ret) *ret = CL_EMALFDB;
return NULL;
}
}
#else
if (((ovr = strchr(res, '{')) && ((ovr - res) == 2)) ||
((ovr = strrchr(res, '}')) && ((res + j - ovr) == 3))) {
cli_errmsg("parse_yara_hex_string: Single byte subpatterns unsupported in ClamAV\n");
free(res);
if (ret != NULL)
*ret = CL_EMALFDB;
return NULL;
}
#endif
if (ret)
*ret = CL_SUCCESS;
return res;
}
struct cli_ytable_entry {
char *offset;
char *hexstr;
uint8_t sigopts;
};
struct cli_ytable {
struct cli_ytable_entry **table;
int32_t tbl_cnt;
};
static int32_t ytable_lookup(const char *hexsig)
{
(void)hexsig;
/* TODO - WRITE ME! */
return -1;
}
static cl_error_t ytable_add_attrib(struct cli_ytable *ytable, const char *hexsig, const char *value, int type)
{
int32_t lookup;
if (!ytable || !value)
return CL_ENULLARG;
if (!hexsig)
lookup = ytable->tbl_cnt - 1; /* assuming to attach to current string */
else
lookup = ytable_lookup(hexsig);
if (lookup < 0) {
cli_yaramsg("ytable_add_attrib: hexsig cannot be found\n");
return CL_EARG;
}
if (type) {
/* add to sigopts */
switch (*value) {
case 'i':
ytable->table[lookup]->sigopts |= ACPATT_OPTION_NOCASE;
break;
case 'f':
ytable->table[lookup]->sigopts |= ACPATT_OPTION_FULLWORD;
break;
case 'w':
ytable->table[lookup]->sigopts |= ACPATT_OPTION_WIDE;
break;
case 'a':
ytable->table[lookup]->sigopts |= ACPATT_OPTION_ASCII;
break;
default:
cli_yaramsg("ytable_add_attrib: invalid sigopt %02x\n", *value);
return CL_EARG;
}
} else {
/* overwrite the previous offset */
if (ytable->table[lookup]->offset)
free(ytable->table[lookup]->offset);
ytable->table[lookup]->offset = cli_strdup(value);
if (!ytable->table[lookup]->offset) {
cli_yaramsg("ytable_add_attrib: ran out of memory for offset\n");
return CL_EMEM;
}
}
return CL_SUCCESS;
}
/* function is dumb - TODO - rewrite using hashtable */
static int ytable_add_string(struct cli_ytable *ytable, const char *hexsig)
{
struct cli_ytable_entry *new;
struct cli_ytable_entry **newtable;
int ret;
if (!ytable || !hexsig)
return CL_ENULLARG;
new = cli_calloc(1, sizeof(struct cli_ytable_entry));
if (!new) {
cli_yaramsg("ytable_add_string: out of memory for new ytable entry\n");
return CL_EMEM;
}
new->hexstr = cli_strdup(hexsig);
if (!new->hexstr) {
cli_yaramsg("ytable_add_string: out of memory for hexsig copy\n");
free(new);
return CL_EMEM;
}
ytable->tbl_cnt++;
newtable = cli_realloc(ytable->table, ytable->tbl_cnt * sizeof(struct cli_ytable_entry *));
if (!newtable) {
cli_yaramsg("ytable_add_string: failed to reallocate new ytable table\n");
free(new->hexstr);
free(new);
ytable->tbl_cnt--;
return CL_EMEM;
}
newtable[ytable->tbl_cnt - 1] = new;
ytable->table = newtable;
if (CL_SUCCESS != (ret = ytable_add_attrib(ytable, NULL, "*", 0))) {
cli_yaramsg("ytable_add_string: failed to add default offset\n");
free(new->hexstr);
free(new);
ytable->tbl_cnt--;
return ret;
}
return CL_SUCCESS;
}
static void ytable_delete(struct cli_ytable *ytable)
{
int32_t i;
if (!ytable)
return;
if (ytable->table) {
for (i = 0; i < ytable->tbl_cnt; ++i) {
free(ytable->table[i]->offset);
free(ytable->table[i]->hexstr);
free(ytable->table[i]);
}
free(ytable->table);
}
}
/* should only operate on HEX STRINGS */
static int yara_hexstr_verify(YR_STRING *string, const char *hexstr, uint32_t *lsigid, struct cl_engine *engine, unsigned int options)
{
int ret = CL_SUCCESS;
/* Quick Check 1: NULL String */
if (!hexstr || !string) {
cli_warnmsg("load_oneyara[verify]: string is empty\n");
return CL_ENULLARG;
}
/* Quick Check 2: String Too Short */
if (strlen(hexstr) / 2 < CLI_DEFAULT_AC_MINDEPTH) {
cli_warnmsg("load_oneyara[verify]: string is too short: %s\n", string->identifier);
return CL_EMALFDB;
}
/* Long Check: Attempt to load hexstr */
if (CL_SUCCESS != (ret = cli_sigopts_handler(engine->test_root, "test-hex", hexstr, 0, 0, 0, "*", lsigid, options))) {
if (ret == CL_EMALFDB) {
cli_warnmsg("load_oneyara[verify]: recovered from database loading error\n");
/* TODO: if necessary, reset testing matcher if error occurs */
cli_warnmsg("load_oneyara[verify]: string failed test insertion: %s\n", string->identifier);
}
return ret;
}
return CL_SUCCESS;
}
static unsigned int yara_total, yara_loaded, yara_malform, yara_empty, yara_complex;
#define YARATARGET0 "Target:0"
#define YARATARGET1 "Target:1"
#define EPSTR "EP+0:"
/* yara has no apparent cap on the number of strings; TODO - should we have one? */
/* function base off load_oneldb */
static int load_oneyara(YR_RULE *rule, int chkpua, struct cl_engine *engine, unsigned int options, unsigned int *sigs)
{
YR_STRING *string;
struct cli_ytable ytable;
size_t i;
int str_error = 0, ret = CL_SUCCESS;
struct cli_lsig_tdb tdb;
uint32_t lsigid[2];
struct cli_matcher *root;
struct cli_ac_lsig **newtable, *lsig, *tsig = NULL;
char *logic = NULL, *target_str = NULL;
char *newident = NULL;
/* size_t lsize; */ // only used in commented out code
/* char *exp_op = "|"; */ // only used in commented out code
cli_yaramsg("load_oneyara: attempting to load %s\n", rule->identifier);
if (!rule) {
cli_errmsg("load_oneyara: empty rule passed as argument\n");
return CL_ENULLARG;
}
/* PUA and IGN checks */
if (chkpua && cli_chkpua(rule->identifier, engine->pua_cats, options))
return CL_SUCCESS;
if (engine->ignored && cli_chkign(engine->ignored, rule->identifier, rule->identifier)) {
return CL_SUCCESS;
}
newident = cli_malloc(strlen(rule->identifier) + 5 + 1);
if (!newident) {
cli_errmsg("cli_loadyara(): newident == NULL\n");
return CL_EMEM;
}
snprintf(newident, strlen(rule->identifier) + 5 + 1, "YARA.%s", rule->identifier);
if (engine->cb_sigload && engine->cb_sigload("yara", newident, ~options & CL_DB_OFFICIAL, engine->cb_sigload_ctx)) {
cli_dbgmsg("cli_loadyara: skipping %s due to callback\n", newident);
free(newident);
(*sigs)--;
return CL_SUCCESS;
}
memset(&ytable, 0, sizeof(ytable));
/*** rule specific checks ***/
#ifdef YARA_FINISHED
if (RULE_IS_PRIVATE(rule)) {
cli_warnmsg("load_oneyara: private modifier for yara rule is unsupported\n");
cli_yaramsg("RULE_IS_PRIVATE yes\n");
}
if (RULE_IS_GLOBAL(rule)) {
cli_warnmsg("load_oneyara: global modifier for yara rule is unsupported\n");
cli_yaramsg("RULE_IS_GLOBAL yes\n");
}
if ((rule->g_flags) & RULE_GFLAGS_REQUIRE_FILE) {
cli_warnmsg("load_oneyara: RULE_GFLAGS_REQUIRE_FILE for yara rule is unsupported\n");
cli_yaramsg("RULE_GFLAGS_REQUIRE_FILE yes\n");
}
if (RULE_IS_NULL(rule) || ((rule->g_flags) & RULE_GFLAGS_REQUIRE_EXECUTABLE)) {
cli_warnmsg("load_oneyara: skipping %s due to unsupported rule gflags\n", newident);
cli_yaramsg("RULE_IS_NULL %s\n", RULE_IS_NULL(rule) ? "yes" : "no");
cli_yaramsg("RULE_GFLAGS_REQUIRE_EXECUTABLE %s\n", ((rule->g_flags) & RULE_GFLAGS_REQUIRE_EXECUTABLE) ? "yes" : "no");
free(newident);
(*sigs)--;
return CL_SUCCESS;
}
#else
/*
cli_warnmsg("load_oneyara: yara support is incomplete, rule flags are ignored\n");
if (RULE_IS_PRIVATE(rule))
cli_yaramsg("RULE_IS_PRIVATE yes\n");
if (RULE_IS_GLOBAL(rule))
cli_yaramsg("RULE_IS_GLOBAL yes\n");
if (RULE_IS_NULL(rule))
cli_yaramsg("RULE_IS_NULL yes\n");
if ((rule->g_flags) & RULE_GFLAGS_REQUIRE_FILE)
cli_yaramsg("RULE_GFLAGS_REQUIRE_FILE yes\n");
if ((rule->g_flags) & RULE_GFLAGS_REQUIRE_EXECUTABLE)
cli_yaramsg("RULE_GFLAGS_REQUIRE_EXECUTABLE yes\n");
*/
#endif
/*** verification step - can clamav load it? ***/
/*** initial population pass for the strings table ***/
STAILQ_FOREACH(string, &rule->strings, link)
{
char *substr = NULL;
/* string type handler */
if (STRING_IS_NULL(string)) {
cli_warnmsg("load_oneyara: skipping NULL string %s\n", newident);
// str_error++; /* kill the insertion? */
continue;
#ifdef YARA_FINISHED
} else if (STRING_IS_LITERAL(string)) {
/* TODO - handle literal strings, short-circuits other string type handling */
cli_yaramsg("load_oneyara: literal string: [%.*s] => [%s]\n", string->length, string->string, substr);
#else
} else if (STRING_IS_LITERAL(string)) {
cli_errmsg("load_oneyara: literal strings are unsupported, reorganize existing code\n");
#endif
} else if (STRING_IS_HEX(string)) {
substr = parse_yara_hex_string(string, &ret);
if (ret != CL_SUCCESS) {
cli_errmsg("load_oneyara: error in parsing yara hex string\n");
str_error++;
break;
}
/* handle lack of hexstr support here in order to suppress */
/* initialize testing matcher */
if (!engine->test_root) {
engine->test_root = (struct cli_matcher *)MPOOL_CALLOC(engine->mempool, 1, sizeof(struct cli_matcher));
if (!engine->test_root) {
cli_errmsg("load_oneyara[verify]: cannot allocate memory for test cli_matcher\n");
free(substr);
free(newident);
return CL_EMEM;
}
#ifdef USE_MPOOL
engine->test_root->mempool = engine->mempool;
#endif
if (CL_SUCCESS != (ret = cli_ac_init(engine->test_root, engine->ac_mindepth, engine->ac_maxdepth, engine->dconf->other & OTHER_CONF_PREFILTERING))) {
cli_errmsg("load_oneyara: cannot initialize test ac root\n");
free(substr);
free(newident);
return ret;
}
}
/* generate a test lsig if one does not exist */
if (!tsig) {
/*** populating lsig ***/
tsig = (struct cli_ac_lsig *)MPOOL_CALLOC(engine->mempool, 1, sizeof(struct cli_ac_lsig));
if (!tsig) {
cli_errmsg("load_oneyara: cannot allocate memory for test lsig\n");
free(substr);
free(newident);
return CL_EMEM;
}
root = engine->test_root;
tsig->type = CLI_YARA_NORMAL;
lsigid[0] = tsig->id = root->ac_lsigs;
/* For logical subsignatures, only store the virname in the lsigtable entry. */
tsig->virname = CLI_MPOOL_VIRNAME(engine->mempool, newident, options & CL_DB_OFFICIAL);
if (NULL == tsig->virname) {
root->ac_lsigs--;
cli_errmsg("load_oneyara: failed to allocate signature name for yara test lsig\n");
MPOOL_FREE(engine->mempool, tsig);
free(substr);
free(newident);
return CL_EMEM;
}
root->ac_lsigs++;
newtable = (struct cli_ac_lsig **)MPOOL_REALLOC(engine->mempool, root->ac_lsigtable, root->ac_lsigs * sizeof(struct cli_ac_lsig *));
if (!newtable) {
root->ac_lsigs--;
cli_errmsg("load_oneyara: cannot allocate test root->ac_lsigtable\n");
MPOOL_FREE(engine->mempool, tsig->virname);
MPOOL_FREE(engine->mempool, tsig);
free(substr);
free(newident);
return CL_EMEM;
}
newtable[root->ac_lsigs - 1] = tsig;
root->ac_lsigtable = newtable;
}
/* attempt to insert hexsig */
lsigid[1] = 0;
ret = yara_hexstr_verify(string, substr, lsigid, engine, options);
if (ret != CL_SUCCESS) {
str_error++;
free(substr);
break;
}
cli_yaramsg("load_oneyara: hex string: [%.*s] => [%s]\n", string->length, string->string, substr);
ytable_add_string(&ytable, substr);
free(substr);
} else if (STRING_IS_REGEXP(string)) {
/* TODO - rewrite to NOT use PCRE_BYPASS */
#if HAVE_PCRE
size_t length = strlen(PCRE_BYPASS) + string->length + 3;
substr = cli_calloc(length, sizeof(char));
if (!substr) {
cli_errmsg("load_oneyara: cannot allocate memory for converted regex string\n");
str_error++;
ret = CL_EMEM;
break;
}
snprintf(substr, length, "%s/%.*s/", PCRE_BYPASS, string->length, string->string);
cli_yaramsg("load_oneyara: regex string: [%.*s] => [%s]\n", string->length, string->string, substr);
ytable_add_string(&ytable, substr);
free(substr);
#else
cli_warnmsg("cli_loadyara: %s uses PCREs but support is disabled\n", newident);
str_error++;
ret = CL_SUCCESS;
break;
#endif
} else {
/* TODO - extract the string length to handle NULL hex-escaped characters
* For now, we'll just use the strlen we get which crudely finds the length
*/
size_t length = string->length;
size_t totsize = 2 * length + 1;
if (length < CLI_DEFAULT_AC_MINDEPTH) {
cli_warnmsg("load_oneyara: string is too short %s\n", newident);
str_error++;
continue;
}
substr = cli_calloc(totsize, sizeof(char));
if (!substr) {
cli_errmsg("load_oneyara: cannot allocate memory for converted generic string\n");
str_error++;
ret = CL_EMEM;
break;
}
for (i = 0; i < length; ++i) {
size_t len = strlen(substr);
snprintf(substr + len, totsize - len, "%02x", string->string[i]);
}
cli_yaramsg("load_oneyara: generic string: [%.*s] => [%s]\n", string->length, string->string, substr);
ytable_add_string(&ytable, substr);
free(substr);
}
/* modifier handler */
if (STRING_IS_NO_CASE(string)) {
cli_yaramsg("STRING_IS_NO_CASE %s\n", STRING_IS_SINGLE_MATCH(string) ? "yes" : "no");
if (CL_SUCCESS != (ret = ytable_add_attrib(&ytable, NULL, "i", 1))) {
cli_warnmsg("load_oneyara: failed to add 'nocase' sigopt\n");
str_error++;
break;
}
}
if (STRING_IS_ASCII(string)) {
cli_yaramsg("STRING_IS_ASCII %s\n", STRING_IS_SINGLE_MATCH(string) ? "yes" : "no");
if (CL_SUCCESS != (ret = ytable_add_attrib(&ytable, NULL, "a", 1))) {
cli_warnmsg("load_oneyara: failed to add 'ascii' sigopt\n");
str_error++;
break;
}
}
if (STRING_IS_WIDE(string)) {
cli_yaramsg("STRING_IS_WIDE %s\n", STRING_IS_SINGLE_MATCH(string) ? "yes" : "no");
/* handle lack of 'wide' support for regex here in order to suppress */
if (STRING_IS_REGEXP(string)) {
cli_warnmsg("load_oneyara[verify]: wide modifier [w] is not supported for regex subsigs\n");
str_error++;
break;
}
if (CL_SUCCESS != (ret = ytable_add_attrib(&ytable, NULL, "w", 1))) {
cli_warnmsg("load_oneyara: failed to add 'wide' sigopt\n");
str_error++;
break;
}
}
if (STRING_IS_FULL_WORD(string)) {
cli_yaramsg("STRING_IS_FULL_WORD %s\n", STRING_IS_SINGLE_MATCH(string) ? "yes" : "no");
if (CL_SUCCESS != (ret = ytable_add_attrib(&ytable, NULL, "f", 1))) {
cli_warnmsg("load_oneyara: failed to add 'fullword' sigopt\n");
str_error++;
break;
}
}
#ifdef YARA_FINISHED
/* special modifier handler */
if (STRING_IS_ANONYMOUS(string))
cli_yaramsg("STRING_IS_ANONYMOUS %s\n", STRING_IS_SINGLE_MATCH(string) ? "yes" : "no");
/* unsupported(?) modifier handler */
if (STRING_IS_SINGLE_MATCH(string))
cli_yaramsg("STRING_IS_SINGLE_MATCH %s\n", STRING_IS_SINGLE_MATCH(string) ? "yes" : "no");
if (STRING_IS_REFERENCED(string) || STRING_IS_FAST_HEX_REGEXP(string) || STRING_IS_CHAIN_PART(string) ||
STRING_IS_CHAIN_TAIL(string) || STRING_FITS_IN_ATOM(string)) {
cli_warnmsg("load_oneyara: skipping unsupported string %s\n", newident);
cli_yaramsg("STRING_IS_REFERENCED %s\n", STRING_IS_REFERENCED(string) ? "yes" : "no");
cli_yaramsg("STRING_IS_FAST_HEX_REGEXP %s\n", STRING_IS_FAST_HEX_REGEXP(string) ? "yes" : "no");
cli_yaramsg("STRING_IS_CHAIN_PART %s\n", STRING_IS_CHAIN_PART(string) ? "yes" : "no");
cli_yaramsg("STRING_IS_CHAIN_TAIL %s\n", STRING_IS_CHAIN_TAIL(string) ? "yes" : "no");
cli_yaramsg("STRING_FITS_IN_ATOM %s\n", STRING_FITS_IN_ATOM(string) ? "yes" : "no");
str_error++;
continue;
}
#else
/*
cli_warnmsg("load_oneyara: yara support is incomplete, rule flags are ignored\n");
if (STRING_IS_ANONYMOUS(string))
cli_yaramsg("STRING_IS_ANONYMOUS yes\n");
if (STRING_IS_SINGLE_MATCH(string))
cli_yaramsg("STRING_IS_SINGLE_MATCH yes\n");
if (STRING_IS_REFERENCED(string))
cli_yaramsg("STRING_IS_REFERENCED yes\n");
if (STRING_IS_FAST_HEX_REGEXP(string))
cli_yaramsg("STRING_IS_FAST_HEX_REGEXP yes\n");
if (STRING_IS_CHAIN_PART(string))
cli_yaramsg("STRING_IS_CHAIN_PART yes\n");
if (STRING_IS_CHAIN_TAIL(string))
cli_yaramsg("STRING_IS_CHAIN_TAIL yes\n");
if (STRING_FITS_IN_ATOM(string))
cli_yaramsg("STRING_FITS_IN_ATOM yes\n");
*/
#endif
string->subsig_id = ytable.tbl_cnt - 1;
}
if (str_error > 0) {
cli_warnmsg("load_oneyara: clamav cannot support %d input strings, skipping %s\n", str_error, newident);
yara_malform++;
ytable_delete(&ytable);
free(newident);
(*sigs)--;
return ret;
} else if (ytable.tbl_cnt == 0) {
cli_warnmsg("load_oneyara: yara rule contains no supported strings, skipping %s\n", newident);
yara_malform++;
ytable_delete(&ytable);
free(newident);
(*sigs)--;
return CL_SUCCESS; /* TODO - kill signature instead? */
} else if (ytable.tbl_cnt > MAX_LDB_SUBSIGS) {
cli_warnmsg("load_oneyara: yara rule contains too many subsigs (%d, max: %d), skipping %s\n", ytable.tbl_cnt, MAX_LDB_SUBSIGS, newident);
yara_malform++;
ytable_delete(&ytable);
free(newident);
(*sigs)--;
return CL_SUCCESS;
}
/*** conditional verification step (ex. do we define too many strings versus used?) ***/
/*** additional string table population (ex. offsets), second translation table pass ***/
#if 0
if (rule->cl_flags & RULE_ALL || rule->cl_flags & RULE_ANY) {
lsize = 3*ytable.tbl_cnt;
logic = cli_calloc(lsize, sizeof(char));
if (!logic) {
cli_errmsg("load_oneyara: cannot allocate memory for logic statement\n");
ytable_delete(&ytable);
return CL_EMEM;
}
if (rule->cl_flags & RULE_ALL && rule->cl_flags & RULE_THEM)
exp_op = "&";
else {
exp_op = "|";
if ((!(rule->cl_flags & RULE_ANY && rule->cl_flags & RULE_THEM) && ytable.tbl_cnt > 1) &&
!(rule->cl_flags & RULE_EP && ytable.tbl_cnt == 1))
yara_complex++;
}
for (i=0; i<ytable.tbl_cnt; i++) {
size_t len=strlen(logic);
snprintf(logic+len, lsize-len, "%u%s", i, (i+1 == ytable.tbl_cnt) ? "" : exp_op);
}
/*** END CONDITIONAL HANDLING ***/
}
/* TDB */
if (rule->cl_flags & RULE_EP && ytable.tbl_cnt == 1)
target_str = cli_strdup(YARATARGET1);
else
#endif
target_str = cli_strdup(YARATARGET0);
memset(&tdb, 0, sizeof(tdb));
if (CL_SUCCESS != (ret = init_tdb(&tdb, engine, target_str, newident))) {
ytable_delete(&ytable);
free(logic);
free(target_str);
free(newident);
(*sigs)--;
if (ret == CL_BREAK)
return CL_SUCCESS;
return ret;
}
free(target_str);
/*** populating lsig ***/
root = engine->root[tdb.target[0]];
lsig = (struct cli_ac_lsig *)MPOOL_CALLOC(engine->mempool, 1, sizeof(struct cli_ac_lsig));
if (!lsig) {
cli_errmsg("load_oneyara: Can't allocate memory for lsig\n");
FREE_TDB(tdb);
ytable_delete(&ytable);
free(logic);
free(newident);
return CL_EMEM;
}
if (logic) {
cli_yaramsg("normal lsig triggered yara: %s\n", logic);
lsig->type = CLI_LSIG_NORMAL;
lsig->u.logic = CLI_MPOOL_STRDUP(engine->mempool, logic);
free(logic);
if (!lsig->u.logic) {
cli_errmsg("load_oneyara: Can't allocate memory for lsig->logic\n");
FREE_TDB(tdb);
ytable_delete(&ytable);
MPOOL_FREE(engine->mempool, lsig);
free(newident);
return CL_EMEM;
}
} else {
if (NULL != (lsig->u.code_start = rule->code_start)) {
lsig->type = (rule->cl_flags & RULE_OFFSETS) ? CLI_YARA_OFFSET : CLI_YARA_NORMAL;
if (RULE_IS_PRIVATE(rule))
lsig->flag |= CLI_LSIG_FLAG_PRIVATE;
} else {
cli_errmsg("load_oneyara: code start is NULL\n");
FREE_TDB(tdb);
ytable_delete(&ytable);
MPOOL_FREE(engine->mempool, lsig);
free(newident);
return CL_EMEM;
}
}
/* For logical subsignatures, only store the virname in the lsigtable entry. */
lsig->virname = CLI_MPOOL_VIRNAME(engine->mempool, newident, options & CL_DB_OFFICIAL);
if (NULL == lsig->virname) {
cli_errmsg("load_oneyara: failed to allocate signature name for yara lsig\n");
FREE_TDB(tdb);
ytable_delete(&ytable);
MPOOL_FREE(engine->mempool, lsig);
free(newident);
return CL_EMEM;
}
lsigid[0] = lsig->id = root->ac_lsigs;
root->ac_lsigs++;
newtable = (struct cli_ac_lsig **)MPOOL_REALLOC(engine->mempool, root->ac_lsigtable, root->ac_lsigs * sizeof(struct cli_ac_lsig *));
if (!newtable) {
root->ac_lsigs--;
cli_errmsg("cli_loadldb: Can't realloc root->ac_lsigtable\n");
FREE_TDB(tdb);
ytable_delete(&ytable);
MPOOL_FREE(engine->mempool, lsig);
free(newident);
return CL_EMEM;
}
newtable[root->ac_lsigs - 1] = lsig;
root->ac_lsigtable = newtable;
tdb.subsigs = ytable.tbl_cnt;
/*** loading step - put things into the AC trie ***/
for (i = 0; i < (size_t)ytable.tbl_cnt; ++i) {
lsigid[1] = i;
cli_yaramsg("%zu: [%s] [%s] [%s%s%s%s]\n", i, ytable.table[i]->hexstr, ytable.table[i]->offset,
(ytable.table[i]->sigopts & ACPATT_OPTION_NOCASE) ? "i" : "",
(ytable.table[i]->sigopts & ACPATT_OPTION_FULLWORD) ? "f" : "",
(ytable.table[i]->sigopts & ACPATT_OPTION_WIDE) ? "w" : "",
(ytable.table[i]->sigopts & ACPATT_OPTION_ASCII) ? "a" : "");
ret = readdb_parse_yara_string(root, newident, ytable.table[i]->hexstr, ytable.table[i]->sigopts,
ytable.table[i]->offset, lsigid, options);
if (CL_SUCCESS != ret) {
root->ac_lsigs--;
FREE_TDB(tdb);
ytable_delete(&ytable);
MPOOL_FREE(engine->mempool, lsig);
yara_malform++;
free(newident);
return ret;
}
}
memcpy(&lsig->tdb, &tdb, sizeof(tdb));
ytable_delete(&ytable);
rule->lsigid = root->ac_lsigs - 1;
yara_loaded++;
cli_yaramsg("load_oneyara: successfully loaded %s\n", newident);
free(newident);
return CL_SUCCESS;
}
struct _yara_global {
YR_ARENA *the_arena;
YR_HASH_TABLE *rules_table;
YR_HASH_TABLE *objects_table;
YR_HASH_TABLE *db_table;
};
cl_error_t cli_yara_init(struct cl_engine *engine)
{
/* Initialize YARA */
engine->yara_global = cli_calloc(1, sizeof(struct _yara_global));
if (NULL == engine->yara_global) {
cli_errmsg("cli_yara_init: failed to create YARA global\n");
return CL_EMEM;
}
if (ERROR_SUCCESS != yr_arena_create(1024, 0, &engine->yara_global->the_arena)) {
cli_errmsg("cli_yara_init: failed to create the YARA arena\n");
free(engine->yara_global);
engine->yara_global = NULL;
return CL_EMEM;
}
if (ERROR_SUCCESS != yr_hash_table_create(10007, &engine->yara_global->rules_table)) {
cli_errmsg("cli_yara_init: failed to create the YARA rules table\n");
yr_arena_destroy(engine->yara_global->the_arena);
engine->yara_global->the_arena = NULL;
free(engine->yara_global);
engine->yara_global = NULL;
return CL_EMEM;
}
if (ERROR_SUCCESS != yr_hash_table_create(10007, &engine->yara_global->objects_table)) {
cli_errmsg("cli_yara_init: failed to create the YARA objects table\n");
yr_hash_table_destroy(engine->yara_global->rules_table, NULL);
yr_arena_destroy(engine->yara_global->the_arena);
engine->yara_global->rules_table = NULL;
engine->yara_global->the_arena = NULL;
free(engine->yara_global);
engine->yara_global = NULL;
engine->yara_global = NULL;
return CL_EMEM;
}
if (ERROR_SUCCESS != yr_hash_table_create(10007, &engine->yara_global->db_table)) {
cli_errmsg("cli_yara_init: failed to create the YARA objects table\n");
yr_hash_table_destroy(engine->yara_global->objects_table, NULL);
yr_hash_table_destroy(engine->yara_global->rules_table, NULL);
yr_arena_destroy(engine->yara_global->the_arena);
engine->yara_global->objects_table = NULL;
engine->yara_global->rules_table = NULL;
engine->yara_global->the_arena = NULL;
free(engine->yara_global);
engine->yara_global = NULL;
return CL_EMEM;
}
return CL_SUCCESS;
}
void cli_yara_free(struct cl_engine *engine)
{
if (engine->yara_global != NULL) {
if (engine->yara_global->db_table != NULL) {
yr_hash_table_destroy(engine->yara_global->db_table, NULL);
engine->yara_global->db_table = NULL;
}
if (engine->yara_global->rules_table != NULL) {
yr_hash_table_destroy(engine->yara_global->rules_table, NULL);
engine->yara_global->rules_table = NULL;
}
if (engine->yara_global->objects_table != NULL) {
yr_hash_table_destroy(engine->yara_global->objects_table, NULL);
engine->yara_global->objects_table = NULL;
}
if (engine->yara_global->the_arena != NULL) {
yr_arena_destroy(engine->yara_global->the_arena);
engine->yara_global->the_arena = NULL;
}
free(engine->yara_global);
engine->yara_global = NULL;
}
}
// TODO - pua? dbio?
static int cli_loadyara(FILE *fs, struct cl_engine *engine, unsigned int *signo, unsigned int options, struct cli_dbio *dbio, const char *filename)
{
YR_COMPILER compiler;
YR_NAMESPACE ns;
YR_RULE *rule;
unsigned int sigs = 0, rules = 0, rule_errors = 0;
int rc;
UNUSEDPARAM(dbio);
if ((rc = cli_initroots(engine, options)))
return rc;
memset(&compiler, 0, sizeof(YR_COMPILER));
compiler.last_result = ERROR_SUCCESS;
STAILQ_INIT(&compiler.rule_q);
STAILQ_INIT(&compiler.current_rule_string_q);
rc = yr_arena_create(65536, 0, &compiler.sz_arena);
if (rc == ERROR_SUCCESS)
rc = yr_arena_create(65536, 0, &compiler.rules_arena);
if (rc == ERROR_SUCCESS)
rc = yr_arena_create(65536, 0, &compiler.code_arena);
if (rc == ERROR_SUCCESS)
rc = yr_arena_create(65536, 0, &compiler.strings_arena);
if (rc == ERROR_SUCCESS)
rc = yr_arena_create(65536, 0, &compiler.metas_arena);
if (rc != ERROR_SUCCESS)
return CL_EMEM;
compiler.loop_for_of_mem_offset = -1;
ns.name = "default";
compiler.current_namespace = &ns;
compiler.the_arena = engine->yara_global->the_arena;
compiler.rules_table = engine->yara_global->rules_table;
compiler.objects_table = engine->yara_global->objects_table;
compiler.allow_includes = 1;
_yr_compiler_push_file_name(&compiler, filename);
rc = yr_lex_parse_rules_file(fs, &compiler);
if (rc > 0) { /* rc = number of errors */
/* TODO - handle the various errors? */
#ifdef YARA_FINISHED
cli_errmsg("cli_loadyara: failed to parse rules file %s, error count %i\n", filename, rc);
if (compiler.sz_arena != NULL)
yr_arena_destroy(compiler.sz_arena);
if (compiler.rules_arena != NULL)
yr_arena_destroy(compiler.rules_arena);
if (compiler.code_arena != NULL)
yr_arena_destroy(compiler.code_arena);
if (compiler.strings_arena != NULL)
yr_arena_destroy(compiler.strings_arena);
if (compiler.metas_arena != NULL)
yr_arena_destroy(compiler.metas_arena);
_yr_compiler_pop_file_name(&compiler);
return CL_EMALFDB;
#else
if (compiler.last_result == ERROR_INSUFICIENT_MEMORY)
return CL_EMEM;
rule_errors = rc;
rc = CL_SUCCESS;
#endif
}
while (!STAILQ_EMPTY(&compiler.rule_q)) {
rule = STAILQ_FIRST(&compiler.rule_q);
STAILQ_REMOVE(&compiler.rule_q, rule, _yc_rule, link);
rules++;
sigs++; /* can be decremented by load_oneyara */
rc = load_oneyara(rule,
engine->pua_cats && (options & CL_DB_PUA_MODE) && (options & (CL_DB_PUA_INCLUDE | CL_DB_PUA_EXCLUDE)),
engine, options, &sigs);
if (rc != CL_SUCCESS) {
cli_warnmsg("cli_loadyara: problem parsing yara file %s, yara rule %s\n", filename, rule->identifier);
continue;
}
}
if (0 != rule_errors)
cli_warnmsg("cli_loadyara: failed to parse or load %u yara rules from file %s, successfully loaded %u rules.\n", rule_errors + rules - sigs, filename, sigs);
yr_arena_append(engine->yara_global->the_arena, compiler.sz_arena);
yr_arena_append(engine->yara_global->the_arena, compiler.rules_arena);
yr_arena_append(engine->yara_global->the_arena, compiler.strings_arena);
yr_arena_destroy(compiler.code_arena);
yr_arena_destroy(compiler.metas_arena);
_yr_compiler_pop_file_name(&compiler);
if (rc)
return rc;
#ifdef YARA_FINISHED
if (!rules) {
cli_errmsg("cli_loadyara: empty database file\n");
return CL_EMALFDB;
}
#else
if (!rules) {
cli_warnmsg("cli_loadyara: empty database file\n");
yara_empty++;
}
#endif
/* globals */
yara_total += rules;
if (signo)
*signo += sigs;
cli_yaramsg("cli_loadyara: loaded %u of %u yara signatures from %s\n", sigs, rules, filename);
return CL_SUCCESS;
}
#endif
/* 0 1 2 3
* PasswordName;Attributes;PWStorageType;Password
*/
#define PWDB_TOKENS 4
static int cli_loadpwdb(FILE *fs, struct cl_engine *engine, unsigned int options, unsigned int internal, struct cli_dbio *dbio)
{
const char *tokens[PWDB_TOKENS + 1], *passname;
char *attribs;
char buffer[FILEBUFF];
unsigned int line = 0, skip = 0, pwcnt = 0, tokens_count;
struct cli_pwdb *new;
cl_pwdb_t container;
struct cli_lsig_tdb tdb;
int ret = CL_SUCCESS, pwstype;
while (1) {
if (internal) {
options |= CL_DB_OFFICIAL;
/* TODO - read default passwords */
return CL_SUCCESS;
} else {
if (!cli_dbgets(buffer, FILEBUFF, fs, dbio))
break;
if (buffer[0] == '#')
continue;
cli_chomp(buffer);
}
line++;
tokens_count = cli_strtokenize(buffer, ';', PWDB_TOKENS, tokens);
if (tokens_count != PWDB_TOKENS) {
ret = CL_EMALFDB;
break;
}
passname = tokens[0];
/* check if password is ignored, note that name is not stored */
if (engine->ignored && cli_chkign(engine->ignored, passname, passname)) {
skip++;
continue;
}
if (engine->cb_sigload && engine->cb_sigload("pwdb", passname, ~options & CL_DB_OFFICIAL, engine->cb_sigload_ctx)) {
cli_dbgmsg("cli_loadpwdb: skipping %s due to callback\n", passname);
skip++;
continue;
}
/* append target type 0 to tdb string if needed */
if ((tokens[1][0] == '\0') || (strstr(tokens[1], "Target:") != NULL)) {
attribs = cli_strdup(tokens[1]);
if (!attribs) {
cli_errmsg("cli_loadpwdb: Can't allocate memory for attributes\n");
ret = CL_EMEM;
break;
}
} else {
size_t attlen = strlen(tokens[1]) + 10;
attribs = cli_calloc(attlen, sizeof(char));
if (!attribs) {
cli_errmsg("cli_loadpwdb: Can't allocate memory for attributes\n");
ret = CL_EMEM;
break;
}
snprintf(attribs, attlen, "%s,Target:0", tokens[1]);
}
/* use the tdb to track filetypes and check flevels */
memset(&tdb, 0, sizeof(tdb));
ret = init_tdb(&tdb, engine, attribs, passname);
free(attribs);
if (ret != CL_SUCCESS) {
skip++;
if (ret == CL_BREAK)
continue;
else
break;
}
/* check container type */
if (!tdb.container) {
container = CLI_PWDB_ANY;
} else {
switch (*(tdb.container)) {
case CL_TYPE_ANY:
container = CLI_PWDB_ANY;
break;
case CL_TYPE_ZIP:
container = CLI_PWDB_ZIP;
break;
case CL_TYPE_RAR:
container = CLI_PWDB_RAR;
break;
default:
cli_errmsg("cli_loadpwdb: Invalid container specified to .pwdb signature\n");
return CL_EMALFDB;
}
}
FREE_TDB(tdb);
/* check the PWStorageType */
if (!cli_isnumber(tokens[2])) {
cli_errmsg("cli_loadpwdb: Invalid value for PWStorageType (third entry)\n");
ret = CL_EMALFDB;
break;
}
pwstype = atoi(tokens[2]);
if ((pwstype == 0) || (pwstype == 1)) {
new = (struct cli_pwdb *)MPOOL_CALLOC(engine->mempool, 1, sizeof(struct cli_pwdb));
if (!new) {
ret = CL_EMEM;
break;
}
/* copy passwd name */
new->name = CLI_MPOOL_STRDUP(engine->mempool, tokens[0]);
if (!new->name) {
ret = CL_EMEM;
MPOOL_FREE(engine->mempool, new);
break;
}
if (pwstype == 0) { /* cleartext */
new->passwd = CLI_MPOOL_STRDUP(engine->mempool, tokens[3]);
new->length = (uint16_t)strlen(tokens[3]);
} else { /* 1 => hex-encoded */
new->passwd = CLI_MPOOL_HEX2STR(engine->mempool, tokens[3]);
new->length = (uint16_t)strlen(tokens[3]) / 2;
}
if (!new->passwd) {
cli_errmsg("cli_loadpwdb: Can't decode or add new password entry\n");
if (pwstype == 0)
ret = CL_EMEM;
else
ret = CL_EMALFDB;
MPOOL_FREE(engine->mempool, new->name);
MPOOL_FREE(engine->mempool, new);
break;
}
/* add to the engine list, sorted by target type */
new->next = engine->pwdbs[container];
engine->pwdbs[container] = new;
} else {
cli_dbgmsg("cli_loadpwdb: Unsupported PWStorageType %u\n", pwstype);
continue;
}
pwcnt++;
}
/* error reporting */
if (ret) {
cli_errmsg("Problem processing %s password database at line %u\n", internal ? "built-in" : "external", line);
return ret;
}
if (!pwcnt) {
cli_errmsg("Empty %s password database\n", internal ? "built-in" : "external");
return CL_EMALFDB;
}
cli_dbgmsg("Loaded %u (%u skipped) password entries\n", pwcnt, skip);
return CL_SUCCESS;
}
static cl_error_t cli_loaddbdir(const char *dirname, struct cl_engine *engine, unsigned int *signo, unsigned int options);
cl_error_t cli_load(const char *filename, struct cl_engine *engine, unsigned int *signo, unsigned int options, struct cli_dbio *dbio)
{
cl_error_t ret = CL_SUCCESS;
FILE *fs = NULL;
uint8_t skipped = 0;
const char *dbname;
char buff[FILEBUFF];
if (dbio && dbio->chkonly) {
while (cli_dbgets(buff, FILEBUFF, NULL, dbio)) continue;
return CL_SUCCESS;
}
if (!dbio && (fs = fopen(filename, "rb")) == NULL) {
if (options & CL_DB_DIRECTORY) { /* bb#1624 */
if (access(filename, R_OK)) {
if (errno == ENOENT) {
cli_dbgmsg("Detected race condition, ignoring old file %s\n", filename);
return CL_SUCCESS;
}
}
}
cli_errmsg("cli_load(): Can't open file %s\n", filename);
return CL_EOPEN;
}
if ((dbname = strrchr(filename, *PATHSEP)))
dbname++;
else
dbname = filename;
#ifdef HAVE_YARA
if (options & CL_DB_YARA_ONLY) {
if (cli_strbcasestr(dbname, ".yar") || cli_strbcasestr(dbname, ".yara"))
ret = cli_loadyara(fs, engine, signo, options, dbio, filename);
else
skipped = 1;
} else
#endif
if (cli_strbcasestr(dbname, ".db")) {
ret = cli_loaddb(fs, engine, signo, options, dbio, dbname);
} else if (cli_strbcasestr(dbname, ".cvd")) {
ret = cli_cvdload(fs, engine, signo, options, 0, filename, 0);
} else if (cli_strbcasestr(dbname, ".cld")) {
ret = cli_cvdload(fs, engine, signo, options, 1, filename, 0);
} else if (cli_strbcasestr(dbname, ".cud")) {
ret = cli_cvdload(fs, engine, signo, options, 2, filename, 0);
} else if (cli_strbcasestr(dbname, ".crb")) {
ret = cli_loadcrt(fs, engine, dbio);
} else if (cli_strbcasestr(dbname, ".hdb") || cli_strbcasestr(dbname, ".hsb")) {
ret = cli_loadhash(fs, engine, signo, MD5_HDB, options, dbio, dbname);
} else if (cli_strbcasestr(dbname, ".hdu") || cli_strbcasestr(dbname, ".hsu")) {
if (options & CL_DB_PUA)
ret = cli_loadhash(fs, engine, signo, MD5_HDB, options | CL_DB_PUA_MODE, dbio, dbname);
else
skipped = 1;
} else if (cli_strbcasestr(dbname, ".fp") || cli_strbcasestr(dbname, ".sfp")) {
ret = cli_loadhash(fs, engine, signo, MD5_FP, options, dbio, dbname);
} else if (cli_strbcasestr(dbname, ".mdb") || cli_strbcasestr(dbname, ".msb")) {
ret = cli_loadhash(fs, engine, signo, MD5_MDB, options, dbio, dbname);
} else if (cli_strbcasestr(dbname, ".imp")) {
ret = cli_loadhash(fs, engine, signo, MD5_IMP, options, dbio, dbname);
} else if (cli_strbcasestr(dbname, ".mdu") || cli_strbcasestr(dbname, ".msu")) {
if (options & CL_DB_PUA)
ret = cli_loadhash(fs, engine, signo, MD5_MDB, options | CL_DB_PUA_MODE, dbio, dbname);
else
skipped = 1;
} else if (cli_strbcasestr(dbname, ".ndb")) {
ret = cli_loadndb(fs, engine, signo, 0, options, dbio, dbname);
} else if (cli_strbcasestr(dbname, ".ndu")) {
if (!(options & CL_DB_PUA))
skipped = 1;
else
ret = cli_loadndb(fs, engine, signo, 0, options | CL_DB_PUA_MODE, dbio, dbname);
} else if (cli_strbcasestr(filename, ".ldb")) {
ret = cli_loadldb(fs, engine, signo, options, dbio, dbname);
} else if (cli_strbcasestr(filename, ".ldu")) {
if (options & CL_DB_PUA)
ret = cli_loadldb(fs, engine, signo, options | CL_DB_PUA_MODE, dbio, dbname);
else
skipped = 1;
} else if (cli_strbcasestr(filename, ".cbc")) {
if (options & CL_DB_BYTECODE)
ret = cli_loadcbc(fs, engine, signo, options, dbio, dbname);
else
skipped = 1;
} else if (cli_strbcasestr(dbname, ".sdb")) {
ret = cli_loadndb(fs, engine, signo, 1, options, dbio, dbname);
} else if (cli_strbcasestr(dbname, ".zmd")) {
ret = cli_loadmd(fs, engine, signo, 1, options, dbio, dbname);
} else if (cli_strbcasestr(dbname, ".rmd")) {
ret = cli_loadmd(fs, engine, signo, 2, options, dbio, dbname);
} else if (cli_strbcasestr(dbname, ".cfg")) {
ret = cli_dconf_load(fs, engine, options, dbio);
} else if (cli_strbcasestr(dbname, ".info")) {
ret = cli_loadinfo(fs, engine, options, dbio);
} else if (cli_strbcasestr(dbname, ".wdb")) {
if (options & CL_DB_PHISHING_URLS) {
ret = cli_loadwdb(fs, engine, options, dbio);
} else
skipped = 1;
} else if (cli_strbcasestr(dbname, ".pdb") || cli_strbcasestr(dbname, ".gdb")) {
if (options & CL_DB_PHISHING_URLS) {
ret = cli_loadpdb(fs, engine, signo, options, dbio);
} else
skipped = 1;
} else if (cli_strbcasestr(dbname, ".ftm")) {
ret = cli_loadftm(fs, engine, options, 0, dbio);
} else if (cli_strbcasestr(dbname, ".ign") || cli_strbcasestr(dbname, ".ign2")) {
ret = cli_loadign(fs, engine, options, dbio);
} else if (cli_strbcasestr(dbname, ".idb")) {
ret = cli_loadidb(fs, engine, signo, options, dbio);
} else if (cli_strbcasestr(dbname, ".cdb")) {
ret = cli_loadcdb(fs, engine, signo, options, dbio);
} else if (cli_strbcasestr(dbname, ".cat")) {
ret = cli_loadmscat(fs, dbname, engine, options, dbio);
} else if (cli_strbcasestr(dbname, ".ioc")) {
ret = cli_loadopenioc(fs, dbname, engine, options);
#ifdef HAVE_YARA
} else if (cli_strbcasestr(dbname, ".yar") || cli_strbcasestr(dbname, ".yara")) {
if (!(options & CL_DB_YARA_EXCLUDE))
ret = cli_loadyara(fs, engine, signo, options, dbio, filename);
else
skipped = 1;
#endif
} else if (cli_strbcasestr(dbname, ".pwdb")) {
ret = cli_loadpwdb(fs, engine, options, 0, dbio);
} else {
cli_warnmsg("cli_load: unknown extension - skipping %s\n", filename);
skipped = 1;
}
if (ret) {
cli_errmsg("Can't load %s: %s\n", filename, cl_strerror(ret));
} else {
if (skipped)
cli_dbgmsg("%s skipped\n", filename);
else
cli_dbgmsg("%s loaded\n", filename);
}
if (fs)
fclose(fs);
if (engine->cb_sigload_progress) {
/* Let the progress callback function know how we're doing */
(void)engine->cb_sigload_progress(engine->num_total_signatures, *signo, engine->cb_sigload_progress_ctx);
}
return ret;
}
struct db_ll_entry {
char *path;
unsigned int load_priority;
struct db_ll_entry *next;
};
static void
cli_insertdbtoll(struct db_ll_entry **head, struct db_ll_entry *entry)
{
struct db_ll_entry *iter, *prev;
if (NULL == *head) {
*head = entry;
entry->next = NULL;
return;
}
for (prev = NULL, iter = *head; iter != NULL; prev = iter, iter = iter->next) {
if (entry->load_priority < iter->load_priority) {
if (NULL == prev) {
*head = entry;
} else {
prev->next = entry;
}
entry->next = iter;
return;
}
}
prev->next = entry;
entry->next = NULL;
return;
}
/**
* @brief Count the number of signatures in a line-based signature file
*
* Ignores lines starting with # comment character
*
* @param filepath
* @return size_t
*/
static size_t count_line_based_signatures(const char *filepath)
{
FILE *fp = NULL;
int current_character = 0;
size_t sig_count = 0;
bool in_sig = false;
fp = fopen(filepath, "r");
if (fp == NULL) {
return 0;
}
sig_count++;
while (0 == feof(fp)) {
/* Get the next character */
current_character = fgetc(fp);
if (!in_sig) {
/* Not inside of a signature, yet */
if (!isspace(current_character) && // Ignore newlines and other forms of white space before a signature
('#' != current_character)) // Ignore lines that begin with a # comment character
{
/* Found first character of a new signatures */
sig_count++;
in_sig = true;
}
} else {
/* Inside of a signature */
if (current_character == '\n') {
in_sig = false;
}
}
}
fclose(fp);
return sig_count;
}
/**
* @brief Count the number of signatures in a database file.
*
* Non-database files will be ignored, and count as 0 signatures.
* Database validation is not done, just signature counting.
*
* CVD/CLD/CUD database archives are not counted the hard way, we just trust
* signature count in the header. Yara rules and bytecode sigs count as 1 each.
*
* @param filepath Filepath of the database file to count.
* @return size_t The number of signatures.
*/
static size_t count_signatures(const char *filepath, struct cl_engine *engine, unsigned int options)
{
size_t num_signatures = 0;
struct cl_cvd *db_archive_header = NULL;
if (cli_strbcasestr(filepath, ".cld") ||
cli_strbcasestr(filepath, ".cvd") ||
cli_strbcasestr(filepath, ".cud")) {
/* use the CVD head to get the sig count. */
if (0 == access(filepath, R_OK)) {
db_archive_header = cl_cvdhead(filepath);
if (!db_archive_header) {
cli_errmsg("cli_loaddbdir: error parsing header of %s\n", filepath);
goto done;
}
num_signatures += db_archive_header->sigs;
}
} else if ((CL_BYTECODE_TRUST_ALL == engine->bytecode_security) &&
cli_strbcasestr(filepath, ".cbc")) {
/* Counts as 1 signature if loading plain .cbc files. */
num_signatures += 1;
} else if ((options & CL_DB_YARA_ONLY) &&
(cli_strbcasestr(filepath, ".yar") || cli_strbcasestr(filepath, ".yara"))) {
/* Counts as 1 signature. */
num_signatures += 1;
} else if (cli_strbcasestr(filepath, ".db") ||
cli_strbcasestr(filepath, ".crb") ||
cli_strbcasestr(filepath, ".hdb") || cli_strbcasestr(filepath, ".hsb") ||
cli_strbcasestr(filepath, ".hdu") || cli_strbcasestr(filepath, ".hsu") ||
cli_strbcasestr(filepath, ".fp") || cli_strbcasestr(filepath, ".sfp") ||
cli_strbcasestr(filepath, ".mdb") || cli_strbcasestr(filepath, ".msb") ||
cli_strbcasestr(filepath, ".imp") ||
cli_strbcasestr(filepath, ".mdu") || cli_strbcasestr(filepath, ".msu") ||
cli_strbcasestr(filepath, ".ndb") || cli_strbcasestr(filepath, ".ndu") || cli_strbcasestr(filepath, ".sdb") ||
cli_strbcasestr(filepath, ".ldb") || cli_strbcasestr(filepath, ".ldu") ||
cli_strbcasestr(filepath, ".zmd") || cli_strbcasestr(filepath, ".rmd") ||
cli_strbcasestr(filepath, ".cfg") ||
cli_strbcasestr(filepath, ".wdb") ||
cli_strbcasestr(filepath, ".pdb") || cli_strbcasestr(filepath, ".gdb") ||
cli_strbcasestr(filepath, ".ftm") ||
cli_strbcasestr(filepath, ".ign") || cli_strbcasestr(filepath, ".ign2") ||
cli_strbcasestr(filepath, ".idb") ||
cli_strbcasestr(filepath, ".cdb") ||
cli_strbcasestr(filepath, ".cat") ||
cli_strbcasestr(filepath, ".ioc") ||
cli_strbcasestr(filepath, ".pwdb")) {
/* Should be a line-based signaure file, count it the old fashioned way */
num_signatures += count_line_based_signatures(filepath);
}
done:
if (NULL != db_archive_header) {
cl_cvdfree(db_archive_header);
}
return num_signatures;
}
static cl_error_t cli_loaddbdir(const char *dirname, struct cl_engine *engine, unsigned int *signo, unsigned int options)
{
cl_error_t ret = CL_EOPEN;
DIR *dd = NULL;
struct dirent *dent;
char *dbfile = NULL;
int ends_with_sep = 0;
size_t dirname_len;
struct cl_cvd *daily_cld = NULL;
struct cl_cvd *daily_cvd = NULL;
struct db_ll_entry *head = NULL;
struct db_ll_entry *iter;
struct db_ll_entry *next;
cli_dbgmsg("Loading databases from %s\n", dirname);
if ((dd = opendir(dirname)) == NULL) {
cli_errmsg("cli_loaddbdir: Can't open directory %s\n", dirname);
ret = CL_EOPEN;
goto done;
}
dirname_len = strlen(dirname);
if (dirname_len >= strlen(PATHSEP)) {
if (strcmp(dirname + dirname_len - strlen(PATHSEP), PATHSEP) == 0) {
cli_dbgmsg("cli_loaddbdir: dirname ends with separator\n");
ends_with_sep = 1;
}
}
while ((dent = readdir(dd))) {
struct db_ll_entry *entry;
unsigned int load_priority;
if (!dent->d_ino) {
continue;
}
if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, "..")) {
continue;
}
if (!CLI_DBEXT(dent->d_name)) {
continue;
}
dbfile = (char *)cli_malloc(strlen(dent->d_name) + dirname_len + 2);
if (!dbfile) {
cli_errmsg("cli_loaddbdir: dbfile == NULL\n");
ret = CL_EMEM;
goto done;
}
if (ends_with_sep)
sprintf(dbfile, "%s%s", dirname, dent->d_name);
else
sprintf(dbfile, "%s" PATHSEP "%s", dirname, dent->d_name);
#define DB_LOAD_PRIORITY_IGN 1
#define DB_LOAD_PRIORITY_DAILY_CLD 2
#define DB_LOAD_PRIORITY_DAILY_CVD 3
#define DB_LOAD_PRIORITY_LOCAL_GDB 4
#define DB_LOAD_PRIORITY_DAILY_CFG 5
#define DB_LOAD_PRIORITY_CRB 6
#define DB_LOAD_PRIORITY_NORMAL 7
if (cli_strbcasestr(dent->d_name, ".ign") || cli_strbcasestr(dent->d_name, ".ign2")) {
/* load .ign and .ign2 files first */
load_priority = DB_LOAD_PRIORITY_IGN;
engine->num_total_signatures += count_line_based_signatures(dbfile);
} else if (!strcmp(dent->d_name, "daily.cld")) {
/* The daily db must be loaded before main, this way, the
daily ign & ign2 signatures prevent ign'ored signatures
in all databases from being loaded. */
load_priority = DB_LOAD_PRIORITY_DAILY_CLD;
if (0 == access(dbfile, R_OK)) {
daily_cld = cl_cvdhead(dbfile);
if (!daily_cld) {
cli_errmsg("cli_loaddbdir: error parsing header of %s\n", dbfile);
ret = CL_EMALFDB;
goto done;
}
/* Successfully opened the daily CLD file and read the header info. */
engine->num_total_signatures += daily_cld->sigs;
} else {
free(dbfile);
dbfile = NULL;
continue;
}
} else if (!strcmp(dent->d_name, "daily.cvd")) {
load_priority = DB_LOAD_PRIORITY_DAILY_CVD;
if (0 == access(dbfile, R_OK)) {
daily_cvd = cl_cvdhead(dbfile);
if (!daily_cvd) {
cli_errmsg("cli_loaddbdir: error parsing header of %s\n", dbfile);
ret = CL_EMALFDB;
goto done;
}
/* Successfully opened the daily CVD file and ready the header info. */
engine->num_total_signatures += daily_cvd->sigs;
} else {
free(dbfile);
dbfile = NULL;
continue;
}
} else if (!strcmp(dent->d_name, "local.gdb")) {
load_priority = DB_LOAD_PRIORITY_LOCAL_GDB;
engine->num_total_signatures += count_line_based_signatures(dbfile);
} else if (!strcmp(dent->d_name, "daily.cfg")) {
load_priority = DB_LOAD_PRIORITY_DAILY_CFG;
engine->num_total_signatures += count_line_based_signatures(dbfile);
} else if ((options & CL_DB_OFFICIAL_ONLY) &&
!strstr(dirname, "clamav-") && // Official databases that are temp-files (in the process of updating).
!cli_strbcasestr(dent->d_name, ".cld") && // Official databases that have been updated using incremental updates.
!cli_strbcasestr(dent->d_name, ".cvd")) { // Official databases.
// TODO Should this be higher up in the list? Should we
// ignore .ign/.ign2 files and the local.gdb file when this
// flag is set?
cli_dbgmsg("Skipping unofficial database %s\n", dent->d_name);
free(dbfile);
dbfile = NULL;
continue;
} else if (cli_strbcasestr(dent->d_name, ".crb")) {
/* .cat files cannot be loaded successfully unless there are .crb
* rules that trust the certs used to sign the catalog files.
* Therefore, we need to ensure the .crb rules are loaded prior */
load_priority = DB_LOAD_PRIORITY_CRB;
engine->num_total_signatures += count_line_based_signatures(dbfile);
} else {
load_priority = DB_LOAD_PRIORITY_NORMAL;
engine->num_total_signatures += count_signatures(dbfile, engine, options);
}
entry = malloc(sizeof(*entry));
if (NULL == entry) {
cli_errmsg("cli_loaddbdir: failed to allocate memory for database load list entry\n");
ret = CL_EMEM;
goto done;
}
entry->path = dbfile;
dbfile = NULL;
entry->load_priority = load_priority;
cli_insertdbtoll(&head, entry);
}
/* The list entries are stored in priority order, so now just loop through
* and load everything.
* NOTE: If there's a daily.cld and a daily.cvd, we'll only load whichever
* has the highest version number. If they have the same version number
* we load daily.cld, since that will load faster (it won't attempt to
* verify the digital signature of the db).
*
* TODO It'd be ideal if we treated all cld/cvd pairs like we do the daily
* ones, and only loaded the one with the highest version. */
for (iter = head; iter != NULL; iter = iter->next) {
if (DB_LOAD_PRIORITY_DAILY_CLD == iter->load_priority) {
/* iter is the daily.cld. If we also have the cvd and the cvd is newer, skip the cld. */
if ((NULL != daily_cvd) && (daily_cld->version < daily_cvd->version)) {
continue;
}
} else if (DB_LOAD_PRIORITY_DAILY_CVD == iter->load_priority) {
/* iter is the daily.cvd. If we also have the cld and the cld is same or newer, skip the cvd. */
if ((NULL != daily_cld) && (daily_cld->version >= daily_cvd->version)) {
continue;
}
}
ret = cli_load(iter->path, engine, signo, options, NULL);
if (ret) {
cli_errmsg("cli_loaddbdir: error loading database %s\n", iter->path);
goto done;
}
}
done:
for (iter = head; iter != NULL; iter = next) {
next = iter->next;
free(iter->path);
free(iter);
}
if (NULL != dbfile) {
free(dbfile);
}
if (NULL != dd) {
closedir(dd);
}
if (NULL != daily_cld) {
cl_cvdfree(daily_cld);
}
if (NULL != daily_cvd) {
cl_cvdfree(daily_cvd);
}
if (ret == CL_EOPEN)
cli_errmsg("cli_loaddbdir: No supported database files found in %s\n", dirname);
return ret;
}
cl_error_t cl_load(const char *path, struct cl_engine *engine, unsigned int *signo, unsigned int dboptions)
{
STATBUF sb;
int ret;
if (!engine) {
cli_errmsg("cl_load: engine == NULL\n");
return CL_ENULLARG;
}
if (engine->dboptions & CL_DB_COMPILED) {
cli_errmsg("cl_load(): can't load new databases when engine is already compiled\n");
return CL_EARG;
}
if (CLAMSTAT(path, &sb) == -1) {
switch (errno) {
#if defined(EACCES)
case EACCES:
cli_errmsg("cl_load(): Access denied for path: %s\n", path);
break;
#endif
#if defined(ENOENT)
case ENOENT:
cli_errmsg("cl_load(): No such file or directory: %s\n", path);
break;
#endif
#if defined(ELOOP)
case ELOOP:
cli_errmsg("cl_load(): Too many symbolic links encountered in path: %s\n", path);
break;
#endif
#if defined(EOVERFLOW)
case EOVERFLOW:
cli_errmsg("cl_load(): File size is too large to be recognized. Path: %s\n", path);
break;
#endif
#if defined(EIO)
case EIO:
cli_errmsg("cl_load(): An I/O error occurred while reading from path: %s\n", path);
break;
#endif
default:
cli_errmsg("cl_load: Can't get status of: %s\n", path);
break;
}
return CL_ESTAT;
}
if ((dboptions & CL_DB_PHISHING_URLS) && !engine->phishcheck && (engine->dconf->phishing & PHISHING_CONF_ENGINE))
if (CL_SUCCESS != (ret = phishing_init(engine)))
return ret;
if ((dboptions & CL_DB_BYTECODE) && !engine->bcs.inited) {
if (CL_SUCCESS != (ret = cli_bytecode_init(&engine->bcs)))
return ret;
} else {
cli_dbgmsg("Bytecode engine disabled\n");
}
if (!engine->cache && clean_cache_init(engine))
return CL_EMEM;
engine->dboptions |= dboptions;
switch (sb.st_mode & S_IFMT) {
case S_IFREG:
/* Count # of sigs in the database now */
engine->num_total_signatures += count_signatures(path, engine, dboptions);
ret = cli_load(path, engine, signo, dboptions, NULL);
break;
case S_IFDIR:
/* Count # of signatures inside cli_loaddbdir(), before loading */
ret = cli_loaddbdir(path, engine, signo, dboptions | CL_DB_DIRECTORY);
break;
default:
cli_errmsg("cl_load(%s): Not supported database file type\n", path);
return CL_EOPEN;
}
if (engine->cb_sigload_progress) {
/* Let the progress callback function know we're done! */
(void)engine->cb_sigload_progress(*signo, *signo, engine->cb_sigload_progress_ctx);
}
#ifdef YARA_PROTO
if (yara_total) {
cli_yaramsg("$$$$$$$$$$$$ YARA $$$$$$$$$$$$\n");
cli_yaramsg("\tTotal Rules: %u\n", yara_total);
cli_yaramsg("\tRules Loaded: %u\n", yara_loaded);
cli_yaramsg("\tComplex Conditions: %u\n", yara_complex);
cli_yaramsg("\tMalformed/Unsupported Rules: %u\n", yara_malform);
cli_yaramsg("\tEmpty Rules: %u\n", yara_empty);
cli_yaramsg("$$$$$$$$$$$$ YARA $$$$$$$$$$$$\n");
}
#endif
return ret;
}
const char *cl_retdbdir(void)
{
#ifdef _WIN32
int have_ddir = 0;
char path[MAX_PATH] = "";
DWORD sizof;
HKEY key;
if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, "Software\\ClamAV", 0, KEY_QUERY_VALUE, &key) == ERROR_SUCCESS || RegOpenKeyEx(HKEY_CURRENT_USER, "Software\\ClamAV", 0, KEY_QUERY_VALUE, &key) == ERROR_SUCCESS) {
sizof = sizeof(path);
if (RegQueryValueEx(key, "DataDir", 0, NULL, path, &sizof) == ERROR_SUCCESS) {
have_ddir = 1;
memcpy(DATABASE_DIRECTORY, path, sizof);
}
RegCloseKey(key);
}
if (!(have_ddir) && GetModuleFileName(NULL, path, sizeof(path))) {
char *dir = NULL;
path[sizeof(path) - 1] = '\0';
dir = dirname(path);
snprintf(DATABASE_DIRECTORY, sizeof(DATABASE_DIRECTORY), "%s\\database", dir);
}
DATABASE_DIRECTORY[sizeof(DATABASE_DIRECTORY) - 1] = '\0';
return (const char *)DATABASE_DIRECTORY;
#else
return DATADIR;
#endif
}
cl_error_t cl_statinidir(const char *dirname, struct cl_stat *dbstat)
{
DIR *dd;
struct dirent *dent;
char *fname;
if (dbstat) {
dbstat->entries = 0;
dbstat->stattab = NULL;
dbstat->statdname = NULL;
dbstat->dir = cli_strdup(dirname);
} else {
cli_errmsg("cl_statdbdir(): Null argument passed.\n");
return CL_ENULLARG;
}
if ((dd = opendir(dirname)) == NULL) {
cli_errmsg("cl_statdbdir(): Can't open directory %s\n", dirname);
cl_statfree(dbstat);
return CL_EOPEN;
}
cli_dbgmsg("Stat()ing files in %s\n", dirname);
while ((dent = readdir(dd))) {
if (dent->d_ino) {
if (strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..") && CLI_DBEXT(dent->d_name)) {
dbstat->entries++;
dbstat->stattab = (STATBUF *)cli_realloc2(dbstat->stattab, dbstat->entries * sizeof(STATBUF));
if (!dbstat->stattab) {
cl_statfree(dbstat);
closedir(dd);
return CL_EMEM;
}
#ifdef _WIN32
dbstat->statdname = (char **)cli_realloc2(dbstat->statdname, dbstat->entries * sizeof(char *));
if (!dbstat->statdname) {
cli_errmsg("cl_statinidir: Can't allocate memory for dbstat->statdname\n");
cl_statfree(dbstat);
closedir(dd);
return CL_EMEM;
}
#endif
fname = cli_malloc(strlen(dirname) + strlen(dent->d_name) + 32);
if (!fname) {
cli_errmsg("cl_statinidir: Cant' allocate memory for fname\n");
cl_statfree(dbstat);
closedir(dd);
return CL_EMEM;
}
sprintf(fname, "%s" PATHSEP "%s", dirname, dent->d_name);
#ifdef _WIN32
dbstat->statdname[dbstat->entries - 1] = (char *)cli_malloc(strlen(dent->d_name) + 1);
if (!dbstat->statdname[dbstat->entries - 1]) {
cli_errmsg("cli_statinidir: Can't allocate memory for dbstat->statdname\n");
cl_statfree(dbstat);
closedir(dd);
return CL_EMEM;
}
strcpy(dbstat->statdname[dbstat->entries - 1], dent->d_name);
#endif
CLAMSTAT(fname, &dbstat->stattab[dbstat->entries - 1]);
free(fname);
}
}
}
closedir(dd);
return CL_SUCCESS;
}
int cl_statchkdir(const struct cl_stat *dbstat)
{
DIR *dd;
struct dirent *dent;
STATBUF sb;
unsigned int i, found;
char *fname;
if (!dbstat || !dbstat->dir) {
cli_errmsg("cl_statdbdir(): Null argument passed.\n");
return CL_ENULLARG;
}
if ((dd = opendir(dbstat->dir)) == NULL) {
cli_errmsg("cl_statdbdir(): Can't open directory %s\n", dbstat->dir);
return CL_EOPEN;
}
cli_dbgmsg("Stat()ing files in %s\n", dbstat->dir);
while ((dent = readdir(dd))) {
if (dent->d_ino) {
if (strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..") && CLI_DBEXT(dent->d_name)) {
fname = cli_malloc(strlen(dbstat->dir) + strlen(dent->d_name) + 32);
if (!fname) {
cli_errmsg("cl_statchkdir: can't allocate memory for fname\n");
closedir(dd);
return CL_EMEM;
}
sprintf(fname, "%s" PATHSEP "%s", dbstat->dir, dent->d_name);
CLAMSTAT(fname, &sb);
free(fname);
found = 0;
for (i = 0; i < dbstat->entries; i++)
#ifdef _WIN32
if (!strcmp(dbstat->statdname[i], dent->d_name)) {
#else
if (dbstat->stattab[i].st_ino == sb.st_ino) {
#endif
found = 1;
if (dbstat->stattab[i].st_mtime != sb.st_mtime) {
closedir(dd);
return 1;
}
}
if (!found) {
closedir(dd);
return 1;
}
}
}
}
closedir(dd);
return CL_SUCCESS;
}
void cli_pwdb_list_free(struct cl_engine *engine, struct cli_pwdb *pwdb)
{
struct cli_pwdb *thiz, *that;
#ifndef USE_MPOOL
UNUSEDPARAM(engine);
#endif
thiz = pwdb;
while (thiz) {
that = thiz->next;
MPOOL_FREE(engine->mempool, thiz->name);
MPOOL_FREE(engine->mempool, thiz->passwd);
MPOOL_FREE(engine->mempool, thiz);
thiz = that;
}
}
cl_error_t cl_statfree(struct cl_stat *dbstat)
{
if (dbstat) {
#ifdef _WIN32
int i;
if (dbstat->statdname) {
for (i = 0; i < dbstat->entries; i++) {
if (dbstat->statdname[i])
free(dbstat->statdname[i]);
dbstat->statdname[i] = NULL;
}
free(dbstat->statdname);
dbstat->statdname = NULL;
}
#endif
if (dbstat->stattab) {
free(dbstat->stattab);
dbstat->stattab = NULL;
}
dbstat->entries = 0;
if (dbstat->dir) {
free(dbstat->dir);
dbstat->dir = NULL;
}
} else {
cli_errmsg("cl_statfree(): Null argument passed\n");
return CL_ENULLARG;
}
return CL_SUCCESS;
}
cl_error_t cl_engine_free(struct cl_engine *engine)
{
unsigned int i, j;
struct cli_matcher *root;
size_t tasks_to_do = 0;
size_t tasks_complete = 0;
if (!engine) {
cli_errmsg("cl_free: engine == NULL\n");
return CL_ENULLARG;
}
#ifdef CL_THREAD_SAFE
pthread_mutex_lock(&cli_ref_mutex);
#endif
if (engine->refcount)
engine->refcount--;
if (engine->refcount) {
#ifdef CL_THREAD_SAFE
pthread_mutex_unlock(&cli_ref_mutex);
#endif
return CL_SUCCESS;
}
if (engine->cb_stats_submit)
engine->cb_stats_submit(engine, engine->stats_data);
#ifdef CL_THREAD_SAFE
if (engine->stats_data) {
cli_intel_t *intel = (cli_intel_t *)(engine->stats_data);
pthread_mutex_destroy(&(intel->mutex));
}
pthread_mutex_unlock(&cli_ref_mutex);
#endif
if (engine->stats_data)
free(engine->stats_data);
/*
* Pre-calculate number of "major" tasks to complete for the progress callback
*/
if (engine->root) {
for (i = 0; i < CLI_MTARGETS; i++) {
if ((root = engine->root[i])) {
if (!root->ac_only) {
tasks_to_do += 1; // bm root
}
tasks_to_do += 1; // ac root
if (root->ac_lsigtable) {
tasks_to_do += root->ac_lsigs / 1000; // every 1000 logical sigs
tasks_to_do += 1; // ac lsig table
}
#if HAVE_PCRE
tasks_to_do += 1; // pcre table
#endif
tasks_to_do += 1; // root mempool
}
}
tasks_to_do += 1; // engine root mempool
}
tasks_to_do += 7; // hdb, mdb, imp, fp, crtmgr, cdb, dbinfo
if (engine->dconf) {
if (engine->bcs.all_bcs) {
tasks_to_do += engine->bcs.count;
}
tasks_to_do += 1; // bytecode done
tasks_to_do += 1; // bytecode hooks
tasks_to_do += 1; // phishing cleanup
tasks_to_do += 1; // dconf mempool
}
tasks_to_do += 7; // pwdbs, pua cats, iconcheck, tempdir, cache, engine, ignored
if (engine->test_root) {
root = engine->test_root;
if (!root->ac_only) {
tasks_to_do += 1; // bm root
}
tasks_to_do += 1; // ac root
if (root->ac_lsigtable) {
tasks_to_do += root->ac_lsigs / 1000; // every 1000 logical sigs
tasks_to_do += 1; // ac lsig table
}
#if HAVE_PCRE
tasks_to_do += 1; // pcre table
#endif
tasks_to_do += 1; // fuzzy hashmap
tasks_to_do += 1; // engine root mempool
}
#ifdef USE_MPOOL
tasks_to_do += 1; // mempool
#endif
#ifdef HAVE_YARA
tasks_to_do += 1; // yara
#endif
/*
* Ok, now actually free everything.
*/
#define TASK_COMPLETE() \
if (engine->cb_engine_free_progress) { \
(void)engine->cb_engine_free_progress( \
tasks_to_do, \
++tasks_complete, \
engine->cb_engine_free_progress_ctx); \
}
if (engine->root) {
for (i = 0; i < CLI_MTARGETS; i++) {
if ((root = engine->root[i])) {
if (!root->ac_only) {
cli_bm_free(root);
TASK_COMPLETE();
}
cli_ac_free(root);
TASK_COMPLETE();
if (root->ac_lsigtable) {
for (j = 0; j < root->ac_lsigs; j++) {
if (root->ac_lsigtable[j]->type == CLI_LSIG_NORMAL) {
MPOOL_FREE(engine->mempool, root->ac_lsigtable[j]->u.logic);
}
MPOOL_FREE(engine->mempool, root->ac_lsigtable[j]->virname);
FREE_TDB(root->ac_lsigtable[j]->tdb);
MPOOL_FREE(engine->mempool, root->ac_lsigtable[j]);
TASK_COMPLETE();
}
MPOOL_FREE(engine->mempool, root->ac_lsigtable);
TASK_COMPLETE();
}
#if HAVE_PCRE
cli_pcre_freetable(root);
TASK_COMPLETE();
#endif /* HAVE_PCRE */
fuzzy_hash_free_hashmap(root->fuzzy_hashmap);
TASK_COMPLETE();
MPOOL_FREE(engine->mempool, root);
TASK_COMPLETE();
}
}
MPOOL_FREE(engine->mempool, engine->root);
TASK_COMPLETE();
}
if ((root = engine->hm_hdb)) {
hm_free(root);
MPOOL_FREE(engine->mempool, root);
}
TASK_COMPLETE();
if ((root = engine->hm_mdb)) {
hm_free(root);
MPOOL_FREE(engine->mempool, root);
}
TASK_COMPLETE();
if ((root = engine->hm_imp)) {
hm_free(root);
MPOOL_FREE(engine->mempool, root);
}
TASK_COMPLETE();
if ((root = engine->hm_fp)) {
hm_free(root);
MPOOL_FREE(engine->mempool, root);
}
TASK_COMPLETE();
crtmgr_free(&engine->cmgr);
TASK_COMPLETE();
while (engine->cdb) {
struct cli_cdb *pt = engine->cdb;
engine->cdb = pt->next;
if (pt->name.re_magic)
cli_regfree(&pt->name);
MPOOL_FREE(engine->mempool, pt->res2);
MPOOL_FREE(engine->mempool, pt->virname);
MPOOL_FREE(engine->mempool, pt);
}
TASK_COMPLETE();
while (engine->dbinfo) {
struct cli_dbinfo *pt = engine->dbinfo;
engine->dbinfo = pt->next;
MPOOL_FREE(engine->mempool, pt->name);
MPOOL_FREE(engine->mempool, pt->hash);
if (pt->cvd)
cl_cvdfree(pt->cvd);
MPOOL_FREE(engine->mempool, pt);
}
TASK_COMPLETE();
if (engine->dconf) {
if (engine->bcs.all_bcs) {
for (i = 0; i < engine->bcs.count; i++) {
cli_bytecode_destroy(&engine->bcs.all_bcs[i]);
TASK_COMPLETE();
}
}
cli_bytecode_done(&engine->bcs);
TASK_COMPLETE();
if (engine->bcs.all_bcs) {
free(engine->bcs.all_bcs);
}
for (i = 0; i < _BC_LAST_HOOK - _BC_START_HOOKS; i++) {
free(engine->hooks[i]);
}
TASK_COMPLETE();
phishing_done(engine);
TASK_COMPLETE();
MPOOL_FREE(engine->mempool, engine->dconf);
TASK_COMPLETE();
}
if (engine->pwdbs) {
for (i = 0; i < CLI_PWDB_COUNT; i++)
if (engine->pwdbs[i])
cli_pwdb_list_free(engine, engine->pwdbs[i]);
MPOOL_FREE(engine->mempool, engine->pwdbs);
}
TASK_COMPLETE();
if (engine->pua_cats) {
MPOOL_FREE(engine->mempool, engine->pua_cats);
}
TASK_COMPLETE();
if (engine->iconcheck) {
struct icon_matcher *iconcheck = engine->iconcheck;
for (i = 0; i < 3; i++) {
if (iconcheck->icons[i]) {
for (j = 0; j < iconcheck->icon_counts[i]; j++) {
struct icomtr *metric = iconcheck->icons[i];
MPOOL_FREE(engine->mempool, metric[j].name);
}
MPOOL_FREE(engine->mempool, iconcheck->icons[i]);
}
}
if (iconcheck->group_names[0]) {
for (i = 0; i < iconcheck->group_counts[0]; i++)
MPOOL_FREE(engine->mempool, iconcheck->group_names[0][i]);
MPOOL_FREE(engine->mempool, iconcheck->group_names[0]);
}
if (iconcheck->group_names[1]) {
for (i = 0; i < iconcheck->group_counts[1]; i++)
MPOOL_FREE(engine->mempool, iconcheck->group_names[1][i]);
MPOOL_FREE(engine->mempool, iconcheck->group_names[1]);
}
MPOOL_FREE(engine->mempool, iconcheck);
}
TASK_COMPLETE();
if (engine->tmpdir) {
MPOOL_FREE(engine->mempool, engine->tmpdir);
}
TASK_COMPLETE();
if (engine->cache) {
clean_cache_destroy(engine);
}
TASK_COMPLETE();
cli_ftfree(engine);
TASK_COMPLETE();
if (engine->ignored) {
cli_bm_free(engine->ignored);
MPOOL_FREE(engine->mempool, engine->ignored);
}
TASK_COMPLETE();
if (engine->test_root) {
root = engine->test_root;
if (!root->ac_only) {
cli_bm_free(root);
TASK_COMPLETE();
}
cli_ac_free(root);
TASK_COMPLETE();
if (root->ac_lsigtable) {
for (i = 0; i < root->ac_lsigs; i++) {
if (root->ac_lsigtable[i]->type == CLI_LSIG_NORMAL) {
MPOOL_FREE(engine->mempool, root->ac_lsigtable[i]->u.logic);
}
MPOOL_FREE(engine->mempool, root->ac_lsigtable[i]->virname);
FREE_TDB(root->ac_lsigtable[i]->tdb);
MPOOL_FREE(engine->mempool, root->ac_lsigtable[i]);
TASK_COMPLETE();
}
MPOOL_FREE(engine->mempool, root->ac_lsigtable);
TASK_COMPLETE();
}
#if HAVE_PCRE
cli_pcre_freetable(root);
TASK_COMPLETE();
#endif /* HAVE_PCRE */
MPOOL_FREE(engine->mempool, root);
TASK_COMPLETE();
}
#ifdef USE_MPOOL
if (engine->mempool) mpool_destroy(engine->mempool);
TASK_COMPLETE();
#endif
#ifdef HAVE_YARA
cli_yara_free(engine);
TASK_COMPLETE();
#endif
free(engine);
return CL_SUCCESS;
}
cl_error_t cl_engine_compile(struct cl_engine *engine)
{
unsigned int i;
cl_error_t ret;
struct cli_matcher *root;
size_t tasks_to_do = 0;
size_t tasks_complete = 0;
if (!engine) {
return CL_ENULLARG;
}
/*
* Pre-calculate number of "major" tasks to complete for the progress callback
*/
#ifdef HAVE_YARA
tasks_to_do += 1; // yara free
#endif
tasks_to_do += 1; // load ftm
tasks_to_do += 1; // load pwdb
for (i = 0; i < CLI_MTARGETS; i++) {
if ((root = engine->root[i])) {
tasks_to_do += 1; // build ac trie
#if HAVE_PCRE
tasks_to_do += 1; // compile pcre regex
#endif
}
}
tasks_to_do += 1; // flush hdb
tasks_to_do += 1; // flush mdb
tasks_to_do += 1; // flush imp
tasks_to_do += 1; // flush fp
tasks_to_do += 1; // build allow list regex list
tasks_to_do += 1; // build domain list regex list
if (engine->ignored) {
tasks_to_do += 1; // free list of ignored sigs (no longer needed)
}
if (engine->test_root) {
tasks_to_do += 1; // free test root (no longer needed)
}
tasks_to_do += 1; // prepare bytecode sigs
// Note: Adding a task to compile each bytecode is doable
// but would be painful to implement. For now, just
// having it all as one task should be good enough.
/*
* Ok, now actually compile everything.
*/
#undef TASK_COMPLETE
#define TASK_COMPLETE() \
if (engine->cb_engine_compile_progress) { \
(void)engine->cb_engine_compile_progress( \
tasks_to_do, \
++tasks_complete, \
engine->cb_engine_compile_progress_ctx); \
}
#ifdef HAVE_YARA
/* Free YARA hash tables - only needed for parse and load */
if (engine->yara_global != NULL) {
if (engine->yara_global->rules_table)
yr_hash_table_destroy(engine->yara_global->rules_table, NULL);
if (engine->yara_global->objects_table)
yr_hash_table_destroy(engine->yara_global->objects_table, NULL);
engine->yara_global->rules_table = engine->yara_global->objects_table = NULL;
}
TASK_COMPLETE();
#endif
if (!engine->ftypes)
if ((ret = cli_loadftm(NULL, engine, 0, 1, NULL)))
return ret;
TASK_COMPLETE();
/* handle default passwords */
if (!engine->pwdbs[0] && !engine->pwdbs[1] && !engine->pwdbs[2])
if ((ret = cli_loadpwdb(NULL, engine, 0, 1, NULL)))
return ret;
TASK_COMPLETE();
for (i = 0; i < CLI_MTARGETS; i++) {
if ((root = engine->root[i])) {
if ((ret = cli_ac_buildtrie(root)))
return ret;
TASK_COMPLETE();
#if HAVE_PCRE
if ((ret = cli_pcre_build(root, engine->pcre_match_limit, engine->pcre_recmatch_limit, engine->dconf)))
return ret;
TASK_COMPLETE();
cli_dbgmsg("Matcher[%u]: %s: AC sigs: %u (reloff: %u, absoff: %u) BM sigs: %u (reloff: %u, absoff: %u) PCREs: %u (reloff: %u, absoff: %u) maxpatlen %u %s\n", i, cli_mtargets[i].name, root->ac_patterns, root->ac_reloff_num, root->ac_absoff_num, root->bm_patterns, root->bm_reloff_num, root->bm_absoff_num, root->pcre_metas, root->pcre_reloff_num, root->pcre_absoff_num, root->maxpatlen, root->ac_only ? "(ac_only mode)" : "");
#else
cli_dbgmsg("Matcher[%u]: %s: AC sigs: %u (reloff: %u, absoff: %u) BM sigs: %u (reloff: %u, absoff: %u) maxpatlen %u PCREs: 0 (disabled) %s\n", i, cli_mtargets[i].name, root->ac_patterns, root->ac_reloff_num, root->ac_absoff_num, root->bm_patterns, root->bm_reloff_num, root->bm_absoff_num, root->maxpatlen, root->ac_only ? "(ac_only mode)" : "");
#endif
}
}
if (engine->hm_hdb)
hm_flush(engine->hm_hdb);
TASK_COMPLETE();
if (engine->hm_mdb)
hm_flush(engine->hm_mdb);
TASK_COMPLETE();
if (engine->hm_imp)
hm_flush(engine->hm_imp);
TASK_COMPLETE();
if (engine->hm_fp)
hm_flush(engine->hm_fp);
TASK_COMPLETE();
if ((ret = cli_build_regex_list(engine->allow_list_matcher))) {
return ret;
}
TASK_COMPLETE();
if ((ret = cli_build_regex_list(engine->domain_list_matcher))) {
return ret;
}
TASK_COMPLETE();
if (engine->ignored) {
cli_bm_free(engine->ignored);
MPOOL_FREE(engine->mempool, engine->ignored);
engine->ignored = NULL;
TASK_COMPLETE();
}
if (engine->test_root) {
root = engine->test_root;
if (!root->ac_only)
cli_bm_free(root);
cli_ac_free(root);
if (root->ac_lsigtable) {
for (i = 0; i < root->ac_lsigs; i++) {
if (root->ac_lsigtable[i]->type == CLI_LSIG_NORMAL) {
MPOOL_FREE(engine->mempool, root->ac_lsigtable[i]->u.logic);
}
MPOOL_FREE(engine->mempool, root->ac_lsigtable[i]->virname);
FREE_TDB(root->ac_lsigtable[i]->tdb);
MPOOL_FREE(engine->mempool, root->ac_lsigtable[i]);
}
MPOOL_FREE(engine->mempool, root->ac_lsigtable);
}
#if HAVE_PCRE
cli_pcre_freetable(root);
#endif /* HAVE_PCRE */
MPOOL_FREE(engine->mempool, root);
engine->test_root = NULL;
TASK_COMPLETE();
}
cli_dconf_print(engine->dconf);
MPOOL_FLUSH(engine->mempool);
/* Compile bytecode */
if (CL_SUCCESS != (ret = cli_bytecode_prepare2(engine, &engine->bcs, engine->dconf->bytecode))) {
cli_errmsg("Unable to compile/load bytecode: %s\n", cl_strerror(ret));
return ret;
}
TASK_COMPLETE();
engine->dboptions |= CL_DB_COMPILED;
return CL_SUCCESS;
}
cl_error_t cl_engine_addref(struct cl_engine *engine)
{
if (!engine) {
cli_errmsg("cl_engine_addref: engine == NULL\n");
return CL_ENULLARG;
}
#ifdef CL_THREAD_SAFE
pthread_mutex_lock(&cli_ref_mutex);
#endif
engine->refcount++;
#ifdef CL_THREAD_SAFE
pthread_mutex_unlock(&cli_ref_mutex);
#endif
return CL_SUCCESS;
}
static int countentries(const char *dbname, unsigned int *sigs)
{
char buffer[CLI_DEFAULT_LSIG_BUFSIZE + 1];
FILE *fs;
unsigned int entry = 0;
fs = fopen(dbname, "r");
if (!fs) {
cli_errmsg("countentries: Can't open file %s\n", dbname);
return CL_EOPEN;
}
while (fgets(buffer, sizeof(buffer), fs)) {
if (buffer[0] == '#')
continue;
entry++;
}
fclose(fs);
*sigs += entry;
return CL_SUCCESS;
}
static int countsigs(const char *dbname, unsigned int options, unsigned int *sigs)
{
if ((cli_strbcasestr(dbname, ".cvd") || cli_strbcasestr(dbname, ".cld"))) {
if (options & CL_COUNTSIGS_OFFICIAL) {
struct cl_cvd *cvd = cl_cvdhead(dbname);
if (!cvd) {
cli_errmsg("countsigs: Can't parse %s\n", dbname);
return CL_ECVD;
}
*sigs += cvd->sigs;
cl_cvdfree(cvd);
}
} else if ((cli_strbcasestr(dbname, ".cud"))) {
if (options & CL_COUNTSIGS_UNOFFICIAL) {
struct cl_cvd *cvd = cl_cvdhead(dbname);
if (!cvd) {
cli_errmsg("countsigs: Can't parse %s\n", dbname);
return CL_ECVD;
}
*sigs += cvd->sigs;
cl_cvdfree(cvd);
}
} else if (cli_strbcasestr(dbname, ".cbc")) {
if (options & CL_COUNTSIGS_UNOFFICIAL)
(*sigs)++;
} else if (cli_strbcasestr(dbname, ".wdb") || cli_strbcasestr(dbname, ".fp") || cli_strbcasestr(dbname, ".sfp") || cli_strbcasestr(dbname, ".ign") || cli_strbcasestr(dbname, ".ign2") || cli_strbcasestr(dbname, ".ftm") || cli_strbcasestr(dbname, ".cfg") || cli_strbcasestr(dbname, ".cat")) {
/* ignore allow list/FP signatures and metadata files */
// TODO .crb sigs can contain both allow/trust and block signatures.
// For now we will just include both in the count by not excluding this
// sig type here, but in the future we could extract just the number of
// block list rules manually so that the count is more accurate.
// NOTE: We implicitly ignore .info files because they aren't currently
// in the list of ones checked for by CLI_DBEXT
} else if ((options & CL_COUNTSIGS_UNOFFICIAL) && CLI_DBEXT(dbname)) {
return countentries(dbname, sigs);
}
return CL_SUCCESS;
}
cl_error_t cl_countsigs(const char *path, unsigned int countoptions, unsigned int *sigs)
{
STATBUF sb;
char fname[1024];
struct dirent *dent;
DIR *dd;
cl_error_t ret;
if (!sigs)
return CL_ENULLARG;
if (CLAMSTAT(path, &sb) == -1) {
cli_errmsg("cl_countsigs: Can't stat %s\n", path);
return CL_ESTAT;
}
if ((sb.st_mode & S_IFMT) == S_IFREG) {
return countsigs(path, countoptions, sigs);
} else if ((sb.st_mode & S_IFMT) == S_IFDIR) {
if ((dd = opendir(path)) == NULL) {
cli_errmsg("cl_countsigs: Can't open directory %s\n", path);
return CL_EOPEN;
}
while ((dent = readdir(dd))) {
if (dent->d_ino) {
if (strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..") && CLI_DBEXT(dent->d_name)) {
snprintf(fname, sizeof(fname), "%s" PATHSEP "%s", path, dent->d_name);
fname[sizeof(fname) - 1] = 0;
ret = countsigs(fname, countoptions, sigs);
if (ret != CL_SUCCESS) {
closedir(dd);
return ret;
}
}
}
}
closedir(dd);
} else {
cli_errmsg("cl_countsigs: Unsupported file type\n");
return CL_EARG;
}
return CL_SUCCESS;
}
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