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denyhosts/clamscan/libclamav/others.c

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添加病毒扫描
2022-10-22 18:41:00 +08:00
/*
* Copyright (C) 2013-2022 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
* Copyright (C) 2007-2013 Sourcefire, Inc.
*
* Authors: Tomasz Kojm, Trog
*
* 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 <stdarg.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <stdbool.h>
#ifndef _WIN32
#include <sys/wait.h>
#include <sys/time.h>
#endif
#include <time.h>
#include <fcntl.h>
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#include <errno.h>
#include "target.h"
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif
#ifdef CL_THREAD_SAFE
#include <pthread.h>
#endif
#ifdef HAVE_LIBXML2
#include <libxml/parser.h>
#endif
#ifdef HAVE_LTDL
#include "ltdl.h"
#else // !HAVE_LTDL
#ifndef _WIN32
#include <dlfcn.h>
#endif
#endif // !HAVE_LTDL
#include "clamav.h"
#include "others.h"
#include "regex/regex.h"
#include "matcher-ac.h"
#include "matcher-pcre.h"
#include "default.h"
#include "scanners.h"
#include "bytecode.h"
#include "bytecode_api_impl.h"
#include "cache.h"
#include "readdb.h"
#include "stats.h"
#include "json_api.h"
cl_unrar_error_t (*cli_unrar_open)(const char *filename, void **hArchive, char **comment, uint32_t *comment_size, uint8_t debug_flag);
cl_unrar_error_t (*cli_unrar_peek_file_header)(void *hArchive, unrar_metadata_t *file_metadata);
cl_unrar_error_t (*cli_unrar_extract_file)(void *hArchive, const char *destPath, char *outputBuffer);
cl_unrar_error_t (*cli_unrar_skip_file)(void *hArchive);
void (*cli_unrar_close)(void *hArchive);
int have_rar = 0;
static int is_rar_inited = 0;
#define PASTE2(a, b) a #b
#define PASTE(a, b) PASTE2(a, b)
#ifdef HAVE_LTDL
static int warn_dlerror(const char *msg)
{
const char *err = lt_dlerror();
if (err)
cli_warnmsg("%s: %s\n", msg, err);
else
cli_warnmsg("%s\n", err);
return 0;
}
static int lt_init(void)
{
if (lt_dlinit()) {
warn_dlerror("Cannot init ltdl - unrar support unavailable");
return -1;
}
return 0;
}
static void *load_module(const char *name, const char *featurename)
{
static const char *suffixes[] = {
LT_MODULE_EXT "." LIBCLAMAV_FULLVER,
PASTE(LT_MODULE_EXT ".", LIBCLAMAV_MAJORVER),
LT_MODULE_EXT,
"." LT_LIBEXT};
const char *searchpath;
const lt_dlinfo *info;
char modulename[128];
lt_dlhandle rhandle;
unsigned i;
if (lt_dladdsearchdir(SEARCH_LIBDIR)) {
cli_dbgmsg("lt_dladdsearchdir failed for %s\n", SEARCH_LIBDIR);
}
searchpath = lt_dlgetsearchpath();
if (!searchpath)
searchpath = "";
cli_dbgmsg("searching for %s, user-searchpath: %s\n", featurename, searchpath);
for (i = 0; i < sizeof(suffixes) / sizeof(suffixes[0]); i++) {
snprintf(modulename, sizeof(modulename), "%s%s", name, suffixes[i]);
rhandle = lt_dlopen(modulename);
if (rhandle)
break;
cli_dbgmsg("searching for %s: %s not found\n", featurename, modulename);
}
if (!rhandle) {
const char *err = lt_dlerror();
if (!err) err = "";
#ifdef WARN_DLOPEN_FAIL
cli_warnmsg("Cannot dlopen %s: %s - %s support unavailable\n", name, err, featurename);
#else
cli_dbgmsg("Cannot dlopen %s: %s - %s support unavailable\n", name, err, featurename);
#endif
return rhandle;
}
info = lt_dlgetinfo(rhandle);
if (info)
cli_dbgmsg("%s support loaded from %s %s\n", featurename, info->filename ? info->filename : "?", info->name ? info->name : "");
return (void *)rhandle;
}
static void *get_module_function(lt_dlhandle handle, const char *name)
{
return lt_dlsym(handle, name);
}
#else // !HAVE_LTDL
static void *load_module(const char *name, const char *featurename)
{
static const char *suffixes[] = {
#ifndef _WIN32
LT_MODULE_EXT "." LIBCLAMAV_FULLVER,
PASTE(LT_MODULE_EXT ".", LIBCLAMAV_MAJORVER),
LT_MODULE_EXT,
#endif
"." LT_LIBEXT};
const char *searchpath;
char modulename[128];
size_t i;
#ifdef _WIN32
HMODULE rhandle = NULL;
#else
void *rhandle;
#endif
searchpath = SEARCH_LIBDIR;
cli_dbgmsg("searching for %s, user-searchpath: %s\n", featurename, searchpath);
for (i = 0; i < sizeof(suffixes) / sizeof(suffixes[0]); i++) {
snprintf(modulename, sizeof(modulename), "%s%s", name, suffixes[i]);
#ifdef _WIN32
rhandle = LoadLibraryA(modulename);
#else // !_WIN32
rhandle = dlopen(modulename, RTLD_NOW);
#endif // !_WIN32
if (rhandle) {
break;
}
cli_dbgmsg("searching for %s: %s not found\n", featurename, modulename);
}
if (NULL == rhandle) {
#ifdef _WIN32
char *err = NULL;
DWORD lasterr = GetLastError();
if (0 < lasterr) {
FormatMessageA(
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
lasterr,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR)&err,
0,
NULL);
}
#else // !_WIN32
const char *err = dlerror();
#endif // !_WIN32
#ifdef WARN_DLOPEN_FAIL
if (NULL == err) {
cli_warnmsg("Cannot dlopen %s: Unknown error - %s support unavailable\n", name, featurename);
} else {
cli_warnmsg("Cannot dlopen %s: %s - %s support unavailable\n", name, err, featurename);
}
#else
if (NULL == err) {
cli_dbgmsg("Cannot dlopen %s: Unknown error - %s support unavailable\n", name, featurename);
} else {
cli_dbgmsg("Cannot dlopen %s: %s - %s support unavailable\n", name, err, featurename);
}
#endif
#ifdef _WIN32
if (NULL != err) {
LocalFree(err);
}
#endif
return rhandle;
}
cli_dbgmsg("%s support loaded from %s\n", featurename, modulename);
return (void *)rhandle;
}
#ifdef _WIN32
static void *get_module_function(HMODULE handle, const char *name)
{
void *procAddress = NULL;
procAddress = GetProcAddress(handle, name);
if (NULL == procAddress) {
char *err = NULL;
DWORD lasterr = GetLastError();
if (0 < lasterr) {
FormatMessageA(
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
lasterr,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPCSTR)&err,
0,
NULL);
}
if (NULL == err) {
cli_warnmsg("Failed to get function \"%s\": Unknown error.\n", name);
} else {
cli_warnmsg("Failed to get function \"%s\": %s\n", name, err);
LocalFree(err);
}
}
return procAddress;
}
#else // !_WIN32
static void *get_module_function(void *handle, const char *name)
{
void *procAddress = NULL;
procAddress = dlsym(handle, name);
if (NULL == procAddress) {
const char *err = dlerror();
if (NULL == err) {
cli_warnmsg("Failed to get function \"%s\": Unknown error.\n", name);
} else {
cli_warnmsg("Failed to get function \"%s\": %s\n", name, err);
}
}
return procAddress;
}
#endif // !_WIN32
#endif // !HAVE_LTDL
static void rarload(void)
{
#ifndef UNRAR_LINKED
#ifdef _WIN32
HMODULE rhandle = NULL;
#else
void *rhandle = NULL;
#endif
#endif
if (is_rar_inited) return;
is_rar_inited = 1;
if (have_rar) return;
rhandle = load_module("libclamunrar_iface", "unrar");
if (NULL == rhandle)
return;
if ((NULL == (cli_unrar_open = (cl_unrar_error_t(*)(const char *, void **, char **, uint32_t *, uint8_t))get_module_function(rhandle, "libclamunrar_iface_LTX_unrar_open"))) ||
(NULL == (cli_unrar_peek_file_header = (cl_unrar_error_t(*)(void *, unrar_metadata_t *))get_module_function(rhandle, "libclamunrar_iface_LTX_unrar_peek_file_header"))) ||
(NULL == (cli_unrar_extract_file = (cl_unrar_error_t(*)(void *, const char *, char *))get_module_function(rhandle, "libclamunrar_iface_LTX_unrar_extract_file"))) ||
(NULL == (cli_unrar_skip_file = (cl_unrar_error_t(*)(void *))get_module_function(rhandle, "libclamunrar_iface_LTX_unrar_skip_file"))) ||
(NULL == (cli_unrar_close = (void (*)(void *))get_module_function(rhandle, "libclamunrar_iface_LTX_unrar_close")))) {
cli_warnmsg("Failed to load function from UnRAR module\n");
cli_warnmsg("Version mismatch?\n");
cli_warnmsg("UnRAR support unavailable\n");
return;
}
have_rar = 1;
}
void cl_debug(void)
{
cli_debug_flag = 1;
}
void cl_always_gen_section_hash(void)
{
cli_always_gen_section_hash = 1;
}
unsigned int cl_retflevel(void)
{
return CL_FLEVEL;
}
const char *cl_strerror(int clerror)
{
switch (clerror) {
/* libclamav specific codes */
case CL_CLEAN:
return "No viruses detected";
case CL_VIRUS:
return "Virus(es) detected";
case CL_ENULLARG:
return "Null argument passed to function";
case CL_EARG:
return "Invalid argument passed to function";
case CL_EMALFDB:
return "Malformed database";
case CL_ECVD:
return "Broken or not a CVD file";
case CL_EVERIFY:
return "Can't verify database integrity";
case CL_EUNPACK:
return "Can't unpack some data";
case CL_EPARSE: /* like CL_EFORMAT but reported outside magicscan() */
return "Can't parse data";
/* I/O and memory errors */
case CL_EOPEN:
return "Can't open file or directory";
case CL_ECREAT:
return "Can't create new file";
case CL_EUNLINK:
return "Can't unlink file";
case CL_ESTAT:
return "Can't get file status";
case CL_EREAD:
return "Can't read file";
case CL_ESEEK:
return "Can't set file offset";
case CL_EWRITE:
return "Can't write to file";
case CL_EDUP:
return "Can't duplicate file descriptor";
case CL_EACCES:
return "Can't access file";
case CL_ETMPFILE:
return "Can't create temporary file";
case CL_ETMPDIR:
return "Can't create temporary directory";
case CL_EMAP:
return "Can't map file into memory";
case CL_EMEM:
return "Can't allocate memory";
case CL_ETIMEOUT:
return "Exceeded time limit";
/* internal (needed for debug messages) */
case CL_EMAXREC:
return "Exceeded max recursion depth";
case CL_EMAXSIZE:
return "Exceeded max scan size";
case CL_EMAXFILES:
return "Exceeded max scan files";
case CL_EFORMAT:
return "Bad format or broken data";
case CL_EBYTECODE:
return "Error during bytecode execution";
case CL_EBYTECODE_TESTFAIL:
return "Failure in bytecode testmode";
case CL_ELOCK:
return "Mutex lock failed";
case CL_EBUSY:
return "Scanner still active";
case CL_ESTATE:
return "Bad state (engine not initialized, or already initialized)";
case CL_ERROR:
return "Unspecified error";
case CL_VERIFIED:
return "The scanned object was verified and deemed trusted";
default:
return "Unknown error code";
}
}
cl_error_t cl_init(unsigned int initoptions)
{
cl_error_t rc;
struct timeval tv;
unsigned int pid = (unsigned int)getpid();
UNUSEDPARAM(initoptions);
cl_initialize_crypto();
/* put dlopen() stuff here, etc. */
#ifdef HAVE_LTDL
if (lt_init() == 0) {
rarload();
}
#else
rarload();
#endif
gettimeofday(&tv, (struct timezone *)0);
srand(pid + tv.tv_usec * (pid + 1) + clock());
rc = bytecode_init();
if (rc)
return rc;
#ifdef HAVE_LIBXML2
xmlInitParser();
#endif
return CL_SUCCESS;
}
struct cl_engine *cl_engine_new(void)
{
struct cl_engine *new;
cli_intel_t *intel;
new = (struct cl_engine *)cli_calloc(1, sizeof(struct cl_engine));
if (!new) {
cli_errmsg("cl_engine_new: Can't allocate memory for cl_engine\n");
return NULL;
}
/* Setup default limits */
new->maxscantime = CLI_DEFAULT_TIMELIMIT;
new->maxscansize = CLI_DEFAULT_MAXSCANSIZE;
new->maxfilesize = CLI_DEFAULT_MAXFILESIZE;
new->max_recursion_level = CLI_DEFAULT_MAXRECLEVEL;
new->maxfiles = CLI_DEFAULT_MAXFILES;
new->min_cc_count = CLI_DEFAULT_MIN_CC_COUNT;
new->min_ssn_count = CLI_DEFAULT_MIN_SSN_COUNT;
/* Engine Max sizes */
new->maxembeddedpe = CLI_DEFAULT_MAXEMBEDDEDPE;
new->maxhtmlnormalize = CLI_DEFAULT_MAXHTMLNORMALIZE;
new->maxhtmlnotags = CLI_DEFAULT_MAXHTMLNOTAGS;
new->maxscriptnormalize = CLI_DEFAULT_MAXSCRIPTNORMALIZE;
new->maxziptypercg = CLI_DEFAULT_MAXZIPTYPERCG;
new->bytecode_security = CL_BYTECODE_TRUST_SIGNED;
/* 5 seconds timeout */
new->bytecode_timeout = 60000;
new->bytecode_mode = CL_BYTECODE_MODE_AUTO;
new->refcount = 1;
new->ac_only = 0;
new->ac_mindepth = CLI_DEFAULT_AC_MINDEPTH;
new->ac_maxdepth = CLI_DEFAULT_AC_MAXDEPTH;
#ifdef USE_MPOOL
if (!(new->mempool = mpool_create())) {
cli_errmsg("cl_engine_new: Can't allocate memory for memory pool\n");
free(new);
return NULL;
}
#endif
new->root = MPOOL_CALLOC(new->mempool, CLI_MTARGETS, sizeof(struct cli_matcher *));
if (!new->root) {
cli_errmsg("cl_engine_new: Can't allocate memory for roots\n");
#ifdef USE_MPOOL
mpool_destroy(new->mempool);
#endif
free(new);
return NULL;
}
new->dconf = cli_mpool_dconf_init(new->mempool);
if (!new->dconf) {
cli_errmsg("cl_engine_new: Can't initialize dynamic configuration\n");
MPOOL_FREE(new->mempool, new->root);
#ifdef USE_MPOOL
mpool_destroy(new->mempool);
#endif
free(new);
return NULL;
}
new->pwdbs = MPOOL_CALLOC(new->mempool, CLI_PWDB_COUNT, sizeof(struct cli_pwdb *));
if (!new->pwdbs) {
cli_errmsg("cl_engine_new: Can't initialize password databases\n");
MPOOL_FREE(new->mempool, new->dconf);
MPOOL_FREE(new->mempool, new->root);
#ifdef USE_MPOOL
mpool_destroy(new->mempool);
#endif
free(new);
return NULL;
}
crtmgr_init(&(new->cmgr));
if (crtmgr_add_roots(new, &(new->cmgr), 0)) {
cli_errmsg("cl_engine_new: Can't initialize root certificates\n");
MPOOL_FREE(new->mempool, new->pwdbs);
MPOOL_FREE(new->mempool, new->dconf);
MPOOL_FREE(new->mempool, new->root);
#ifdef USE_MPOOL
mpool_destroy(new->mempool);
#endif
free(new);
return NULL;
}
/* Set up default stats/intel gathering callbacks */
intel = cli_calloc(1, sizeof(cli_intel_t));
if ((intel)) {
#ifdef CL_THREAD_SAFE
if (pthread_mutex_init(&(intel->mutex), NULL)) {
cli_errmsg("cli_engine_new: Cannot initialize stats gathering mutex\n");
MPOOL_FREE(new->mempool, new->pwdbs);
MPOOL_FREE(new->mempool, new->dconf);
MPOOL_FREE(new->mempool, new->root);
#ifdef USE_MPOOL
mpool_destroy(new->mempool);
#endif
free(new);
free(intel);
return NULL;
}
#endif
intel->engine = new;
intel->maxsamples = STATS_MAX_SAMPLES;
intel->maxmem = STATS_MAX_MEM;
intel->timeout = 10;
new->stats_data = intel;
} else {
new->stats_data = NULL;
}
new->cb_stats_add_sample = NULL;
new->cb_stats_submit = NULL;
new->cb_stats_flush = clamav_stats_flush;
new->cb_stats_remove_sample = clamav_stats_remove_sample;
new->cb_stats_decrement_count = clamav_stats_decrement_count;
new->cb_stats_get_num = clamav_stats_get_num;
new->cb_stats_get_size = clamav_stats_get_size;
new->cb_stats_get_hostid = clamav_stats_get_hostid;
/* Setup raw disk image max settings */
new->maxpartitions = CLI_DEFAULT_MAXPARTITIONS;
/* Engine max settings */
new->maxiconspe = CLI_DEFAULT_MAXICONSPE;
new->maxrechwp3 = CLI_DEFAULT_MAXRECHWP3;
/* PCRE matching limitations */
#if HAVE_PCRE
cli_pcre_init();
#endif
new->pcre_match_limit = CLI_DEFAULT_PCRE_MATCH_LIMIT;
new->pcre_recmatch_limit = CLI_DEFAULT_PCRE_RECMATCH_LIMIT;
new->pcre_max_filesize = CLI_DEFAULT_PCRE_MAX_FILESIZE;
#ifdef HAVE_YARA
/* YARA */
if (cli_yara_init(new) != CL_SUCCESS) {
cli_errmsg("cli_engine_new: failed to initialize YARA\n");
MPOOL_FREE(new->mempool, new->pwdbs);
MPOOL_FREE(new->mempool, new->dconf);
MPOOL_FREE(new->mempool, new->root);
#ifdef USE_MPOOL
mpool_destroy(new->mempool);
#endif
free(new);
free(intel);
return NULL;
}
#endif
cli_dbgmsg("Initialized %s engine\n", cl_retver());
return new;
}
cl_error_t cl_engine_set_num(struct cl_engine *engine, enum cl_engine_field field, long long num)
{
if (!engine)
return CL_ENULLARG;
/* TODO: consider adding checks and warn/errs when num overflows the
* destination type
*/
switch (field) {
case CL_ENGINE_MAX_SCANSIZE:
engine->maxscansize = num;
break;
case CL_ENGINE_MAX_FILESIZE:
engine->maxfilesize = num;
break;
case CL_ENGINE_MAX_RECURSION:
if (!num) {
cli_warnmsg("MaxRecursion: the value of 0 is not allowed, using default: %u\n", CLI_DEFAULT_MAXRECLEVEL);
engine->max_recursion_level = CLI_DEFAULT_MAXRECLEVEL;
} else
engine->max_recursion_level = num;
break;
case CL_ENGINE_MAX_FILES:
engine->maxfiles = num;
break;
case CL_ENGINE_MAX_EMBEDDEDPE:
if (num < 0) {
cli_warnmsg("MaxEmbeddedPE: negative values are not allowed, using default: %u\n", CLI_DEFAULT_MAXEMBEDDEDPE);
engine->maxembeddedpe = CLI_DEFAULT_MAXEMBEDDEDPE;
} else
engine->maxembeddedpe = num;
break;
case CL_ENGINE_MAX_HTMLNORMALIZE:
if (num < 0) {
cli_warnmsg("MaxHTMLNormalize: negative values are not allowed, using default: %u\n", CLI_DEFAULT_MAXHTMLNORMALIZE);
engine->maxhtmlnormalize = CLI_DEFAULT_MAXHTMLNORMALIZE;
} else
engine->maxhtmlnormalize = num;
break;
case CL_ENGINE_MAX_HTMLNOTAGS:
if (num < 0) {
cli_warnmsg("MaxHTMLNoTags: negative values are not allowed, using default: %u\n", CLI_DEFAULT_MAXHTMLNOTAGS);
engine->maxhtmlnotags = CLI_DEFAULT_MAXHTMLNOTAGS;
} else
engine->maxhtmlnotags = num;
break;
case CL_ENGINE_MAX_SCRIPTNORMALIZE:
if (num < 0) {
cli_warnmsg("MaxScriptNormalize: negative values are not allowed, using default: %u\n", CLI_DEFAULT_MAXSCRIPTNORMALIZE);
engine->maxscriptnormalize = CLI_DEFAULT_MAXSCRIPTNORMALIZE;
} else
engine->maxscriptnormalize = num;
break;
case CL_ENGINE_MAX_ZIPTYPERCG:
if (num < 0) {
cli_warnmsg("MaxZipTypeRcg: negative values are not allowed, using default: %u\n", CLI_DEFAULT_MAXZIPTYPERCG);
engine->maxziptypercg = CLI_DEFAULT_MAXZIPTYPERCG;
} else
engine->maxziptypercg = num;
break;
case CL_ENGINE_MIN_CC_COUNT:
engine->min_cc_count = num;
break;
case CL_ENGINE_MIN_SSN_COUNT:
engine->min_ssn_count = num;
break;
case CL_ENGINE_DB_OPTIONS:
case CL_ENGINE_DB_VERSION:
case CL_ENGINE_DB_TIME:
cli_warnmsg("cl_engine_set_num: The field is read only\n");
return CL_EARG;
case CL_ENGINE_AC_ONLY:
engine->ac_only = num;
break;
case CL_ENGINE_AC_MINDEPTH:
engine->ac_mindepth = num;
break;
case CL_ENGINE_AC_MAXDEPTH:
engine->ac_maxdepth = num;
break;
case CL_ENGINE_KEEPTMP:
engine->keeptmp = num;
break;
case CL_ENGINE_FORCETODISK:
if (num)
engine->engine_options |= ENGINE_OPTIONS_FORCE_TO_DISK;
else
engine->engine_options &= ~(ENGINE_OPTIONS_FORCE_TO_DISK);
break;
case CL_ENGINE_BYTECODE_SECURITY:
if (engine->dboptions & CL_DB_COMPILED) {
cli_errmsg("cl_engine_set_num: CL_ENGINE_BYTECODE_SECURITY cannot be set after engine was compiled\n");
return CL_EARG;
}
engine->bytecode_security = num;
break;
case CL_ENGINE_BYTECODE_TIMEOUT:
engine->bytecode_timeout = num;
break;
case CL_ENGINE_BYTECODE_MODE:
if (engine->dboptions & CL_DB_COMPILED) {
cli_errmsg("cl_engine_set_num: CL_ENGINE_BYTECODE_MODE cannot be set after engine was compiled\n");
return CL_EARG;
}
if (num == CL_BYTECODE_MODE_OFF) {
cli_errmsg("cl_engine_set_num: CL_BYTECODE_MODE_OFF is not settable, use dboptions to turn off!\n");
return CL_EARG;
}
engine->bytecode_mode = num;
if (num == CL_BYTECODE_MODE_TEST)
cli_infomsg(NULL, "bytecode engine in test mode\n");
break;
case CL_ENGINE_DISABLE_CACHE:
if (num) {
engine->engine_options |= ENGINE_OPTIONS_DISABLE_CACHE;
} else {
engine->engine_options &= ~(ENGINE_OPTIONS_DISABLE_CACHE);
if (!(engine->cache))
cli_cache_init(engine);
}
break;
case CL_ENGINE_DISABLE_PE_STATS:
if (num) {
engine->engine_options |= ENGINE_OPTIONS_DISABLE_PE_STATS;
} else {
engine->engine_options &= ~(ENGINE_OPTIONS_DISABLE_PE_STATS);
}
break;
case CL_ENGINE_STATS_TIMEOUT:
if ((engine->stats_data)) {
cli_intel_t *intel = (cli_intel_t *)(engine->stats_data);
intel->timeout = (uint32_t)num;
}
break;
case CL_ENGINE_MAX_PARTITIONS:
engine->maxpartitions = (uint32_t)num;
break;
case CL_ENGINE_MAX_ICONSPE:
engine->maxiconspe = (uint32_t)num;
break;
case CL_ENGINE_MAX_RECHWP3:
engine->maxrechwp3 = (uint32_t)num;
break;
case CL_ENGINE_MAX_SCANTIME:
engine->maxscantime = (uint32_t)num;
break;
case CL_ENGINE_PCRE_MATCH_LIMIT:
engine->pcre_match_limit = (uint64_t)num;
break;
case CL_ENGINE_PCRE_RECMATCH_LIMIT:
engine->pcre_recmatch_limit = (uint64_t)num;
break;
case CL_ENGINE_PCRE_MAX_FILESIZE:
engine->pcre_max_filesize = (uint64_t)num;
break;
case CL_ENGINE_DISABLE_PE_CERTS:
if (num) {
engine->engine_options |= ENGINE_OPTIONS_DISABLE_PE_CERTS;
} else {
engine->engine_options &= ~(ENGINE_OPTIONS_DISABLE_PE_CERTS);
}
break;
case CL_ENGINE_PE_DUMPCERTS:
if (num) {
engine->engine_options |= ENGINE_OPTIONS_PE_DUMPCERTS;
} else {
engine->engine_options &= ~(ENGINE_OPTIONS_PE_DUMPCERTS);
}
break;
default:
cli_errmsg("cl_engine_set_num: Incorrect field number\n");
return CL_EARG;
}
return CL_SUCCESS;
}
long long cl_engine_get_num(const struct cl_engine *engine, enum cl_engine_field field, int *err)
{
if (!engine) {
cli_errmsg("cl_engine_get_num: engine == NULL\n");
if (err)
*err = CL_ENULLARG;
return -1;
}
if (err)
*err = CL_SUCCESS;
switch (field) {
case CL_ENGINE_DB_OPTIONS:
return engine->dboptions;
case CL_ENGINE_MAX_SCANSIZE:
return engine->maxscansize;
case CL_ENGINE_MAX_FILESIZE:
return engine->maxfilesize;
case CL_ENGINE_MAX_RECURSION:
return engine->max_recursion_level;
case CL_ENGINE_MAX_FILES:
return engine->maxfiles;
case CL_ENGINE_MAX_EMBEDDEDPE:
return engine->maxembeddedpe;
case CL_ENGINE_MAX_HTMLNORMALIZE:
return engine->maxhtmlnormalize;
case CL_ENGINE_MAX_HTMLNOTAGS:
return engine->maxhtmlnotags;
case CL_ENGINE_MAX_SCRIPTNORMALIZE:
return engine->maxscriptnormalize;
case CL_ENGINE_MAX_ZIPTYPERCG:
return engine->maxziptypercg;
case CL_ENGINE_MIN_CC_COUNT:
return engine->min_cc_count;
case CL_ENGINE_MIN_SSN_COUNT:
return engine->min_ssn_count;
case CL_ENGINE_DB_VERSION:
return engine->dbversion[0];
case CL_ENGINE_DB_TIME:
return engine->dbversion[1];
case CL_ENGINE_AC_ONLY:
return engine->ac_only;
case CL_ENGINE_AC_MINDEPTH:
return engine->ac_mindepth;
case CL_ENGINE_AC_MAXDEPTH:
return engine->ac_maxdepth;
case CL_ENGINE_KEEPTMP:
return engine->keeptmp;
case CL_ENGINE_FORCETODISK:
return engine->engine_options & ENGINE_OPTIONS_FORCE_TO_DISK;
case CL_ENGINE_BYTECODE_SECURITY:
return engine->bytecode_security;
case CL_ENGINE_BYTECODE_TIMEOUT:
return engine->bytecode_timeout;
case CL_ENGINE_BYTECODE_MODE:
return engine->bytecode_mode;
case CL_ENGINE_DISABLE_CACHE:
return engine->engine_options & ENGINE_OPTIONS_DISABLE_CACHE;
case CL_ENGINE_STATS_TIMEOUT:
return ((cli_intel_t *)(engine->stats_data))->timeout;
case CL_ENGINE_MAX_PARTITIONS:
return engine->maxpartitions;
case CL_ENGINE_MAX_ICONSPE:
return engine->maxiconspe;
case CL_ENGINE_MAX_RECHWP3:
return engine->maxrechwp3;
case CL_ENGINE_MAX_SCANTIME:
return engine->maxscantime;
case CL_ENGINE_PCRE_MATCH_LIMIT:
return engine->pcre_match_limit;
case CL_ENGINE_PCRE_RECMATCH_LIMIT:
return engine->pcre_recmatch_limit;
case CL_ENGINE_PCRE_MAX_FILESIZE:
return engine->pcre_max_filesize;
default:
cli_errmsg("cl_engine_get: Incorrect field number\n");
if (err)
*err = CL_EARG;
return -1;
}
}
cl_error_t cl_engine_set_str(struct cl_engine *engine, enum cl_engine_field field, const char *str)
{
if (!engine)
return CL_ENULLARG;
switch (field) {
case CL_ENGINE_PUA_CATEGORIES:
if (NULL != engine->pua_cats) {
MPOOL_FREE(engine->mempool, engine->pua_cats);
engine->pua_cats = NULL;
}
engine->pua_cats = CLI_MPOOL_STRDUP(engine->mempool, str);
if (NULL == engine->pua_cats)
return CL_EMEM;
break;
case CL_ENGINE_TMPDIR:
if (NULL != engine->tmpdir) {
MPOOL_FREE(engine->mempool, engine->tmpdir);
engine->tmpdir = NULL;
}
engine->tmpdir = CLI_MPOOL_STRDUP(engine->mempool, str);
if (NULL == engine->tmpdir)
return CL_EMEM;
break;
default:
cli_errmsg("cl_engine_set_num: Incorrect field number\n");
return CL_EARG;
}
return CL_SUCCESS;
}
const char *cl_engine_get_str(const struct cl_engine *engine, enum cl_engine_field field, int *err)
{
if (!engine) {
cli_errmsg("cl_engine_get_str: engine == NULL\n");
if (err)
*err = CL_ENULLARG;
return NULL;
}
if (err)
*err = CL_SUCCESS;
switch (field) {
case CL_ENGINE_PUA_CATEGORIES:
return engine->pua_cats;
case CL_ENGINE_TMPDIR:
return engine->tmpdir;
default:
cli_errmsg("cl_engine_get: Incorrect field number\n");
if (err)
*err = CL_EARG;
return NULL;
}
}
struct cl_settings *cl_engine_settings_copy(const struct cl_engine *engine)
{
struct cl_settings *settings;
settings = (struct cl_settings *)malloc(sizeof(struct cl_settings));
if (!settings) {
cli_errmsg("cl_engine_settings_copy: Unable to allocate memory for settings %llu\n",
(long long unsigned)sizeof(struct cl_settings));
return NULL;
}
settings->ac_only = engine->ac_only;
settings->ac_mindepth = engine->ac_mindepth;
settings->ac_maxdepth = engine->ac_maxdepth;
settings->tmpdir = engine->tmpdir ? strdup(engine->tmpdir) : NULL;
settings->keeptmp = engine->keeptmp;
settings->maxscantime = engine->maxscantime;
settings->maxscansize = engine->maxscansize;
settings->maxfilesize = engine->maxfilesize;
settings->max_recursion_level = engine->max_recursion_level;
settings->maxfiles = engine->maxfiles;
settings->maxembeddedpe = engine->maxembeddedpe;
settings->maxhtmlnormalize = engine->maxhtmlnormalize;
settings->maxhtmlnotags = engine->maxhtmlnotags;
settings->maxscriptnormalize = engine->maxscriptnormalize;
settings->maxziptypercg = engine->maxziptypercg;
settings->min_cc_count = engine->min_cc_count;
settings->min_ssn_count = engine->min_ssn_count;
settings->bytecode_security = engine->bytecode_security;
settings->bytecode_timeout = engine->bytecode_timeout;
settings->bytecode_mode = engine->bytecode_mode;
settings->pua_cats = engine->pua_cats ? strdup(engine->pua_cats) : NULL;
settings->cb_pre_cache = engine->cb_pre_cache;
settings->cb_pre_scan = engine->cb_pre_scan;
settings->cb_post_scan = engine->cb_post_scan;
settings->cb_virus_found = engine->cb_virus_found;
settings->cb_sigload = engine->cb_sigload;
settings->cb_sigload_ctx = engine->cb_sigload_ctx;
settings->cb_hash = engine->cb_hash;
settings->cb_meta = engine->cb_meta;
settings->cb_file_props = engine->cb_file_props;
settings->engine_options = engine->engine_options;
settings->cb_stats_add_sample = engine->cb_stats_add_sample;
settings->cb_stats_remove_sample = engine->cb_stats_remove_sample;
settings->cb_stats_decrement_count = engine->cb_stats_decrement_count;
settings->cb_stats_submit = engine->cb_stats_submit;
settings->cb_stats_flush = engine->cb_stats_flush;
settings->cb_stats_get_num = engine->cb_stats_get_num;
settings->cb_stats_get_size = engine->cb_stats_get_size;
settings->cb_stats_get_hostid = engine->cb_stats_get_hostid;
settings->maxpartitions = engine->maxpartitions;
settings->maxiconspe = engine->maxiconspe;
settings->maxrechwp3 = engine->maxrechwp3;
settings->pcre_match_limit = engine->pcre_match_limit;
settings->pcre_recmatch_limit = engine->pcre_recmatch_limit;
settings->pcre_max_filesize = engine->pcre_max_filesize;
return settings;
}
cl_error_t cl_engine_settings_apply(struct cl_engine *engine, const struct cl_settings *settings)
{
engine->ac_only = settings->ac_only;
engine->ac_mindepth = settings->ac_mindepth;
engine->ac_maxdepth = settings->ac_maxdepth;
engine->keeptmp = settings->keeptmp;
engine->maxscantime = settings->maxscantime;
engine->maxscansize = settings->maxscansize;
engine->maxfilesize = settings->maxfilesize;
engine->max_recursion_level = settings->max_recursion_level;
engine->maxfiles = settings->maxfiles;
engine->maxembeddedpe = settings->maxembeddedpe;
engine->maxhtmlnormalize = settings->maxhtmlnormalize;
engine->maxhtmlnotags = settings->maxhtmlnotags;
engine->maxscriptnormalize = settings->maxscriptnormalize;
engine->maxziptypercg = settings->maxziptypercg;
engine->min_cc_count = settings->min_cc_count;
engine->min_ssn_count = settings->min_ssn_count;
engine->bytecode_security = settings->bytecode_security;
engine->bytecode_timeout = settings->bytecode_timeout;
engine->bytecode_mode = settings->bytecode_mode;
engine->engine_options = settings->engine_options;
if (engine->tmpdir)
MPOOL_FREE(engine->mempool, engine->tmpdir);
if (settings->tmpdir) {
engine->tmpdir = CLI_MPOOL_STRDUP(engine->mempool, settings->tmpdir);
if (!engine->tmpdir)
return CL_EMEM;
} else {
engine->tmpdir = NULL;
}
if (engine->pua_cats)
MPOOL_FREE(engine->mempool, engine->pua_cats);
if (settings->pua_cats) {
engine->pua_cats = CLI_MPOOL_STRDUP(engine->mempool, settings->pua_cats);
if (!engine->pua_cats)
return CL_EMEM;
} else {
engine->pua_cats = NULL;
}
engine->cb_pre_cache = settings->cb_pre_cache;
engine->cb_pre_scan = settings->cb_pre_scan;
engine->cb_post_scan = settings->cb_post_scan;
engine->cb_virus_found = settings->cb_virus_found;
engine->cb_sigload = settings->cb_sigload;
engine->cb_sigload_ctx = settings->cb_sigload_ctx;
engine->cb_hash = settings->cb_hash;
engine->cb_meta = settings->cb_meta;
engine->cb_file_props = settings->cb_file_props;
engine->cb_stats_add_sample = settings->cb_stats_add_sample;
engine->cb_stats_remove_sample = settings->cb_stats_remove_sample;
engine->cb_stats_decrement_count = settings->cb_stats_decrement_count;
engine->cb_stats_submit = settings->cb_stats_submit;
engine->cb_stats_flush = settings->cb_stats_flush;
engine->cb_stats_get_num = settings->cb_stats_get_num;
engine->cb_stats_get_size = settings->cb_stats_get_size;
engine->cb_stats_get_hostid = settings->cb_stats_get_hostid;
engine->maxpartitions = settings->maxpartitions;
engine->maxiconspe = settings->maxiconspe;
engine->maxrechwp3 = settings->maxrechwp3;
engine->pcre_match_limit = settings->pcre_match_limit;
engine->pcre_recmatch_limit = settings->pcre_recmatch_limit;
engine->pcre_max_filesize = settings->pcre_max_filesize;
return CL_SUCCESS;
}
cl_error_t cl_engine_settings_free(struct cl_settings *settings)
{
if (!settings)
return CL_ENULLARG;
free(settings->tmpdir);
free(settings->pua_cats);
free(settings);
return CL_SUCCESS;
}
void cli_append_virus_if_heur_exceedsmax(cli_ctx *ctx, char *vname)
{
if (!ctx->limit_exceeded) {
ctx->limit_exceeded = true; // guard against adding an alert (or metadata) a million times for non-fatal exceeds-max conditions
// TODO: consider changing this from a bool to a threshold so we could at least see more than 1 limits exceeded
if (SCAN_HEURISTIC_EXCEEDS_MAX) {
cli_append_possibly_unwanted(ctx, vname);
cli_dbgmsg("%s: scanning may be incomplete and additional analysis needed for this file.\n", vname);
}
#if HAVE_JSON
/* Also record the event in the scan metadata, under "ParseErrors" */
if (SCAN_COLLECT_METADATA && ctx->wrkproperty) {
cli_json_parse_error(ctx->wrkproperty, vname);
}
#endif
}
}
cl_error_t cli_checklimits(const char *who, cli_ctx *ctx, unsigned long need1, unsigned long need2, unsigned long need3)
{
cl_error_t ret = CL_SUCCESS;
unsigned long needed;
/* if called without limits, go on, unpack, scan */
if (!ctx) return ret;
needed = (need1 > need2) ? need1 : need2;
needed = (needed > need3) ? needed : need3;
/* Enforce timelimit */
if (CL_ETIMEOUT == (ret = cli_checktimelimit(ctx))) {
/* Abort the scan ... */
ret = CL_ETIMEOUT;
}
/* Enforce global scan-size limit */
if (needed && ctx->engine->maxscansize) {
/* if the remaining scansize is too small... */
if (ctx->engine->maxscansize - ctx->scansize < needed) {
/* Skip this file */
cli_dbgmsg("%s: scansize exceeded (initial: %lu, consumed: %lu, needed: %lu)\n", who, (unsigned long int)ctx->engine->maxscansize, (unsigned long int)ctx->scansize, needed);
ret = CL_EMAXSIZE;
cli_append_virus_if_heur_exceedsmax(ctx, "Heuristics.Limits.Exceeded.MaxScanSize");
}
}
/* Enforce per-file file-size limit */
if (needed && ctx->engine->maxfilesize && ctx->engine->maxfilesize < needed) {
/* Skip this file */
cli_dbgmsg("%s: filesize exceeded (allowed: %lu, needed: %lu)\n", who, (unsigned long int)ctx->engine->maxfilesize, needed);
ret = CL_EMAXSIZE;
cli_append_virus_if_heur_exceedsmax(ctx, "Heuristics.Limits.Exceeded.MaxFileSize");
}
/* Enforce limit on number of embedded files */
if (ctx->engine->maxfiles && ctx->scannedfiles >= ctx->engine->maxfiles) {
/* Abort the scan ... */
cli_dbgmsg("%s: files limit reached (max: %u)\n", who, ctx->engine->maxfiles);
ret = CL_EMAXFILES;
cli_append_virus_if_heur_exceedsmax(ctx, "Heuristics.Limits.Exceeded.MaxFiles");
ctx->abort_scan = true;
}
return ret;
}
cl_error_t cli_updatelimits(cli_ctx *ctx, size_t needed)
{
cl_error_t ret = cli_checklimits("cli_updatelimits", ctx, needed, 0, 0);
if (ret != CL_SUCCESS) {
return ret;
}
ctx->scannedfiles++;
ctx->scansize += needed;
if (ctx->scansize > ctx->engine->maxscansize)
ctx->scansize = ctx->engine->maxscansize;
return CL_SUCCESS;
}
/**
* @brief Check if we've exceeded the time limit.
* If ctx is NULL, there can be no timelimit so just return success.
*
* @param ctx The scanning context.
* @return cl_error_t CL_SUCCESS if has not exceeded, CL_ETIMEOUT if has exceeded.
*/
cl_error_t cli_checktimelimit(cli_ctx *ctx)
{
cl_error_t ret = CL_SUCCESS;
if (NULL == ctx) {
goto done;
}
if (ctx->time_limit.tv_sec != 0) {
struct timeval now;
if (gettimeofday(&now, NULL) == 0) {
if (now.tv_sec > ctx->time_limit.tv_sec) {
ctx->abort_scan = true;
ret = CL_ETIMEOUT;
} else if (now.tv_sec == ctx->time_limit.tv_sec && now.tv_usec > ctx->time_limit.tv_usec) {
ctx->abort_scan = true;
ret = CL_ETIMEOUT;
}
}
}
if (CL_ETIMEOUT == ret) {
cli_append_virus_if_heur_exceedsmax(ctx, "Heuristics.Limits.Exceeded.MaxScanTime");
}
done:
return ret;
}
/*
* Type: 1 = MD5, 2 = SHA1, 3 = SHA256
*/
char *cli_hashstream(FILE *fs, unsigned char *digcpy, int type)
{
unsigned char digest[32];
char buff[FILEBUFF];
char *hashstr, *pt;
const char *alg = NULL;
int i, bytes, size;
void *ctx;
switch (type) {
case 1:
alg = "md5";
size = 16;
break;
case 2:
alg = "sha1";
size = 20;
break;
default:
alg = "sha256";
size = 32;
break;
}
ctx = cl_hash_init(alg);
if (!(ctx))
return NULL;
while ((bytes = fread(buff, 1, FILEBUFF, fs)))
cl_update_hash(ctx, buff, bytes);
cl_finish_hash(ctx, digest);
if (!(hashstr = (char *)cli_calloc(size * 2 + 1, sizeof(char))))
return NULL;
pt = hashstr;
for (i = 0; i < size; i++) {
sprintf(pt, "%02x", digest[i]);
pt += 2;
}
if (digcpy)
memcpy(digcpy, digest, size);
return hashstr;
}
char *cli_hashfile(const char *filename, int type)
{
FILE *fs;
char *hashstr;
if ((fs = fopen(filename, "rb")) == NULL) {
cli_errmsg("cli_hashfile(): Can't open file %s\n", filename);
return NULL;
}
hashstr = cli_hashstream(fs, NULL, type);
fclose(fs);
return hashstr;
}
/* Function: unlink
unlink() with error checking
*/
int cli_unlink(const char *pathname)
{
if (unlink(pathname) == -1) {
#ifdef _WIN32
/* Windows may fail to unlink a file if it is marked read-only,
* even if the user has permissions to delete the file. */
if (-1 == _chmod(pathname, _S_IWRITE)) {
char err[128];
cli_warnmsg("cli_unlink: _chmod failure - %s\n", cli_strerror(errno, err, sizeof(err)));
return 1;
} else if (unlink(pathname) == -1) {
char err[128];
cli_warnmsg("cli_unlink: unlink failure - %s\n", cli_strerror(errno, err, sizeof(err)));
return 1;
}
return 0;
#else
char err[128];
cli_warnmsg("cli_unlink: unlink failure - %s\n", cli_strerror(errno, err, sizeof(err)));
return 1;
#endif
}
return 0;
}
void cli_virus_found_cb(cli_ctx *ctx)
{
if (ctx->engine->cb_virus_found)
ctx->engine->cb_virus_found(fmap_fd(ctx->fmap), (const char *)*ctx->virname, ctx->cb_ctx);
}
cl_error_t cli_append_possibly_unwanted(cli_ctx *ctx, const char *virname)
{
if (SCAN_ALLMATCHES) {
return cli_append_virus(ctx, virname);
} else if (SCAN_HEURISTIC_PRECEDENCE) {
return cli_append_virus(ctx, virname);
} else if (ctx->num_viruses == 0 && ctx->virname != NULL && *ctx->virname == NULL) {
ctx->found_possibly_unwanted = 1;
ctx->num_viruses++;
*ctx->virname = virname;
}
return CL_CLEAN;
}
cl_error_t cli_append_virus(cli_ctx *ctx, const char *virname)
{
if (ctx->virname == NULL) {
return CL_CLEAN;
}
if ((ctx->fmap != NULL) &&
(ctx->recursion_stack != NULL) &&
(CL_VIRUS != cli_check_fp(ctx, virname))) {
return CL_CLEAN;
}
if (!SCAN_ALLMATCHES && ctx->num_viruses != 0) {
if (SCAN_HEURISTIC_PRECEDENCE) {
return CL_CLEAN;
}
}
ctx->num_viruses++;
*ctx->virname = virname;
cli_virus_found_cb(ctx);
#if HAVE_JSON
if (SCAN_COLLECT_METADATA && ctx->wrkproperty) {
json_object *arrobj, *virobj;
if (!json_object_object_get_ex(ctx->wrkproperty, "Viruses", &arrobj)) {
arrobj = json_object_new_array();
if (NULL == arrobj) {
cli_errmsg("cli_append_virus: no memory for json virus array\n");
return CL_EMEM;
}
json_object_object_add(ctx->wrkproperty, "Viruses", arrobj);
}
virobj = json_object_new_string(virname);
if (NULL == virobj) {
cli_errmsg("cli_append_virus: no memory for json virus name object\n");
return CL_EMEM;
}
json_object_array_add(arrobj, virobj);
}
#endif
return CL_VIRUS;
}
const char *cli_get_last_virus(const cli_ctx *ctx)
{
if (!ctx || !ctx->virname || !(*ctx->virname))
return NULL;
return *ctx->virname;
}
const char *cli_get_last_virus_str(const cli_ctx *ctx)
{
const char *ret;
if ((ret = cli_get_last_virus(ctx)))
return ret;
return "";
}
cl_error_t cli_recursion_stack_push(cli_ctx *ctx, cl_fmap_t *map, cli_file_t type, bool is_new_buffer)
{
cl_error_t status = CL_SUCCESS;
recursion_level_t *current_container = NULL;
recursion_level_t *new_container = NULL;
// Check the regular limits
if (CL_SUCCESS != (status = cli_checklimits("cli_updatelimits", ctx, map->len, 0, 0))) {
cli_dbgmsg("cli_recursion_stack_push: Some content was skipped. The scan result will not be cached.\n");
emax_reached(ctx); // Disable caching for all recursion layers.
goto done;
}
// Check the recursion limit
if (ctx->recursion_level == ctx->recursion_stack_size - 1) {
cli_dbgmsg("cli_recursion_stack_push: Archive recursion limit exceeded (%u, max: %u)\n", ctx->recursion_level, ctx->engine->max_recursion_level);
cli_dbgmsg("cli_recursion_stack_push: Some content was skipped. The scan result will not be cached.\n");
emax_reached(ctx); // Disable caching for all recursion layers.
cli_append_virus_if_heur_exceedsmax(ctx, "Heuristics.Limits.Exceeded.MaxRecursion");
status = CL_EMAXREC;
goto done;
}
current_container = &ctx->recursion_stack[ctx->recursion_level];
ctx->recursion_level++;
new_container = &ctx->recursion_stack[ctx->recursion_level];
memset(new_container, 0, sizeof(recursion_level_t));
new_container->fmap = map;
new_container->type = type;
new_container->size = map->len;
if (is_new_buffer) {
new_container->recursion_level_buffer = current_container->recursion_level_buffer + 1;
new_container->recursion_level_buffer_fmap = 0;
} else {
new_container->recursion_level_buffer_fmap = current_container->recursion_level_buffer_fmap + 1;
}
if (ctx->next_layer_is_normalized) {
// Normalized layers should be ignored when using the get_type() and get_intermediate_type()
// functions so that signatures that specify the container or intermediates need not account
// for normalized layers "contained in" HTML / Javascript / etc.
new_container->is_normalized_layer = true;
ctx->next_layer_is_normalized = false;
}
ctx->fmap = new_container->fmap;
done:
return status;
}
cl_fmap_t *cli_recursion_stack_pop(cli_ctx *ctx)
{
cl_fmap_t *popped_map = NULL;
if (0 == ctx->recursion_level) {
cli_dbgmsg("cli_recursion_stack_pop: recursion_level == 0, cannot pop off more layers!\n");
goto done;
}
/* save off the fmap to return it to the caller, in case they need it */
popped_map = ctx->recursion_stack[ctx->recursion_level].fmap;
/* We're done with this layer, clear it */
memset(&ctx->recursion_stack[ctx->recursion_level], 0, sizeof(recursion_level_t));
ctx->recursion_level--;
/* Set the ctx->fmap convenience pointer to the current layer's fmap */
ctx->fmap = ctx->recursion_stack[ctx->recursion_level].fmap;
done:
return popped_map;
}
void cli_recursion_stack_change_type(cli_ctx *ctx, cli_file_t type)
{
ctx->recursion_stack[ctx->recursion_level].type = type;
}
/**
* @brief Convert the desired index into the recursion stack to an actual index, excluding normalized layers.
*
* Accepts negative indexes, which is in fact the primary use case.
*
* For index:
* 0 == the outermost (bottom) layer of the stack.
* 1 == the first layer (probably never explicitly used).
* -1 == the present innermost (top) layer of the stack.
* -2 == the parent layer (or "container"). That is, the second from the top of the stack.
*
* @param ctx The scanning context.
* @param index The index (probably negative) of the layer we think we want.
* @return int -1 if layer doesn't exist, else the index of the desired layer in the recursion_stack
*/
static int recursion_stack_get(cli_ctx *ctx, int index)
{
int desired_layer;
int current_layer = (int)ctx->recursion_level;
if (index < 0) {
desired_layer = ctx->recursion_level + index + 1; // The +1 is so that -1 == the current layer
// and -2 == the parent layer (the container)
} else {
desired_layer = index;
}
if (desired_layer > current_layer) {
desired_layer = ctx->recursion_level + 1; // layer doesn't exist
goto done;
}
while (current_layer >= desired_layer && current_layer > 0) {
if (ctx->recursion_stack[current_layer].is_normalized_layer) {
// The current layer is normalized, so we should step back an extra layer
// It's okay if desired_layer goes negative.
desired_layer--;
}
current_layer--;
}
done:
return desired_layer;
}
cli_file_t cli_recursion_stack_get_type(cli_ctx *ctx, int index)
{
int index_ignoring_normalized_layers;
// translate requested index into index of non-normalized layer
index_ignoring_normalized_layers = recursion_stack_get(ctx, index);
if (0 > index_ignoring_normalized_layers) {
// Layer too low, does not exist.
// Most likely we're at the top layer and there is no container. That's okay.
return CL_TYPE_ANY;
} else if (ctx->recursion_level < (uint32_t)index_ignoring_normalized_layers) {
// layer too high, does not exist. This should never happen!
return CL_TYPE_IGNORED;
}
return ctx->recursion_stack[index_ignoring_normalized_layers].type;
}
size_t cli_recursion_stack_get_size(cli_ctx *ctx, int index)
{
int index_ignoring_normalized_layers;
// translate requested index into index of non-normalized layer
index_ignoring_normalized_layers = recursion_stack_get(ctx, index);
if (0 > index_ignoring_normalized_layers) {
// Layer too low, does not exist.
// Most likely we're at the top layer and there is no container. That's okay.
return ctx->recursion_stack[0].size;
} else if (ctx->recursion_level < (uint32_t)index_ignoring_normalized_layers) {
// layer too high, does not exist. This should never happen!
return 0;
}
return ctx->recursion_stack[index_ignoring_normalized_layers].size;
}
#ifdef C_WINDOWS
/*
* Windows doesn't allow you to delete a directory while it is still open
*/
int cli_rmdirs(const char *name)
{
int rc;
STATBUF statb;
DIR *dd;
struct dirent *dent;
char err[128];
if (CLAMSTAT(name, &statb) < 0) {
cli_warnmsg("cli_rmdirs: Can't locate %s: %s\n", name, cli_strerror(errno, err, sizeof(err)));
return -1;
}
if (!S_ISDIR(statb.st_mode)) {
if (cli_unlink(name)) return -1;
return 0;
}
if ((dd = opendir(name)) == NULL)
return -1;
rc = 0;
while ((dent = readdir(dd)) != NULL) {
char *path;
if (strcmp(dent->d_name, ".") == 0)
continue;
if (strcmp(dent->d_name, "..") == 0)
continue;
path = cli_malloc(strlen(name) + strlen(dent->d_name) + 2);
if (path == NULL) {
cli_errmsg("cli_rmdirs: Unable to allocate memory for path %u\n", strlen(name) + strlen(dent->d_name) + 2);
closedir(dd);
return -1;
}
sprintf(path, "%s\\%s", name, dent->d_name);
rc = cli_rmdirs(path);
free(path);
if (rc != 0)
break;
}
closedir(dd);
if (rmdir(name) < 0) {
cli_errmsg("cli_rmdirs: Can't remove temporary directory %s: %s\n", name, cli_strerror(errno, err, sizeof(err)));
return -1;
}
return rc;
}
#else
int cli_rmdirs(const char *dirname)
{
DIR *dd;
struct dirent *dent;
STATBUF maind, statbuf;
char *path;
char err[128];
chmod(dirname, 0700);
if ((dd = opendir(dirname)) != NULL) {
while (CLAMSTAT(dirname, &maind) != -1) {
if (!rmdir(dirname)) break;
if (errno != ENOTEMPTY && errno != EEXIST && errno != EBADF) {
cli_errmsg("cli_rmdirs: Can't remove temporary directory %s: %s\n", dirname, cli_strerror(errno, err, sizeof(err)));
closedir(dd);
return -1;
}
while ((dent = readdir(dd))) {
if (dent->d_ino) {
if (strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..")) {
path = cli_malloc(strlen(dirname) + strlen(dent->d_name) + 2);
if (!path) {
cli_errmsg("cli_rmdirs: Unable to allocate memory for path %llu\n", (long long unsigned)(strlen(dirname) + strlen(dent->d_name) + 2));
closedir(dd);
return -1;
}
sprintf(path, "%s" PATHSEP "%s", dirname, dent->d_name);
/* stat the file */
if (LSTAT(path, &statbuf) != -1) {
if (S_ISDIR(statbuf.st_mode) && !S_ISLNK(statbuf.st_mode)) {
if (rmdir(path) == -1) { /* can't be deleted */
if (errno == EACCES) {
cli_errmsg("cli_rmdirs: Can't remove some temporary directories due to access problem.\n");
closedir(dd);
free(path);
return -1;
}
if (cli_rmdirs(path)) {
cli_warnmsg("cli_rmdirs: Can't remove nested directory %s\n", path);
free(path);
closedir(dd);
return -1;
}
}
} else {
if (cli_unlink(path)) {
free(path);
closedir(dd);
return -1;
}
}
}
free(path);
}
}
}
rewinddir(dd);
}
} else {
return -1;
}
closedir(dd);
return 0;
}
#endif
/* Implement a generic bitset, trog@clamav.net */
#define BITS_PER_CHAR (8)
#define BITSET_DEFAULT_SIZE (1024)
static unsigned long nearest_power(unsigned long num)
{
unsigned long n = BITSET_DEFAULT_SIZE;
while (n < num) {
n <<= 1;
if (n == 0) {
return num;
}
}
return n;
}
bitset_t *cli_bitset_init(void)
{
bitset_t *bs;
bs = cli_malloc(sizeof(bitset_t));
if (!bs) {
cli_errmsg("cli_bitset_init: Unable to allocate memory for bs %llu\n", (long long unsigned)sizeof(bitset_t));
return NULL;
}
bs->length = BITSET_DEFAULT_SIZE;
bs->bitset = cli_calloc(BITSET_DEFAULT_SIZE, 1);
if (!bs->bitset) {
cli_errmsg("cli_bitset_init: Unable to allocate memory for bs->bitset %u\n", BITSET_DEFAULT_SIZE);
free(bs);
return NULL;
}
return bs;
}
void cli_bitset_free(bitset_t *bs)
{
if (!bs) {
return;
}
if (bs->bitset) {
free(bs->bitset);
}
free(bs);
}
static bitset_t *bitset_realloc(bitset_t *bs, unsigned long min_size)
{
unsigned long new_length;
unsigned char *new_bitset;
new_length = nearest_power(min_size);
new_bitset = (unsigned char *)cli_realloc(bs->bitset, new_length);
if (!new_bitset) {
return NULL;
}
bs->bitset = new_bitset;
memset(bs->bitset + bs->length, 0, new_length - bs->length);
bs->length = new_length;
return bs;
}
int cli_bitset_set(bitset_t *bs, unsigned long bit_offset)
{
unsigned long char_offset;
char_offset = bit_offset / BITS_PER_CHAR;
bit_offset = bit_offset % BITS_PER_CHAR;
if (char_offset >= bs->length) {
bs = bitset_realloc(bs, char_offset + 1);
if (!bs) {
return FALSE;
}
}
bs->bitset[char_offset] |= ((unsigned char)1 << bit_offset);
return TRUE;
}
int cli_bitset_test(bitset_t *bs, unsigned long bit_offset)
{
unsigned long char_offset;
char_offset = bit_offset / BITS_PER_CHAR;
bit_offset = bit_offset % BITS_PER_CHAR;
if (char_offset >= bs->length) {
return FALSE;
}
return (bs->bitset[char_offset] & ((unsigned char)1 << bit_offset));
}
void cl_engine_set_clcb_pre_cache(struct cl_engine *engine, clcb_pre_cache callback)
{
engine->cb_pre_cache = callback;
}
void cl_engine_set_clcb_pre_scan(struct cl_engine *engine, clcb_pre_scan callback)
{
engine->cb_pre_scan = callback;
}
void cl_engine_set_clcb_post_scan(struct cl_engine *engine, clcb_post_scan callback)
{
engine->cb_post_scan = callback;
}
void cl_engine_set_clcb_virus_found(struct cl_engine *engine, clcb_virus_found callback)
{
engine->cb_virus_found = callback;
}
void cl_engine_set_clcb_sigload(struct cl_engine *engine, clcb_sigload callback, void *context)
{
engine->cb_sigload = callback;
engine->cb_sigload_ctx = callback ? context : NULL;
}
void cl_engine_set_clcb_hash(struct cl_engine *engine, clcb_hash callback)
{
engine->cb_hash = callback;
}
void cl_engine_set_clcb_meta(struct cl_engine *engine, clcb_meta callback)
{
engine->cb_meta = callback;
}
void cl_engine_set_clcb_file_props(struct cl_engine *engine, clcb_file_props callback)
{
engine->cb_file_props = callback;
}
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