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ClamAV is an open source (GPLv2) anti-virus toolkit.
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clamav/libclamav/scanners.c

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/*
* Copyright (C) 2007-2008 Sourcefire, Inc.
*
* Authors: Tomasz Kojm
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#ifndef _WIN32
#include <sys/time.h>
#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include <fcntl.h>
#include <dirent.h>
#ifdef HAVE_SYS_TIMES_H
#include <sys/times.h>
#endif
#define DCONF_ARCH ctx->dconf->archive
#define DCONF_DOC ctx->dconf->doc
#define DCONF_MAIL ctx->dconf->mail
#define DCONF_OTHER ctx->dconf->other
#include "clamav.h"
#include "others.h"
#include "dconf.h"
#include "scanners.h"
#include "matcher-ac.h"
#include "matcher-bm.h"
#include "matcher.h"
#include "ole2_extract.h"
#include "vba_extract.h"
#include "msexpand.h"
#include "mbox.h"
#include "chmunpack.h"
#include "pe.h"
#include "elf.h"
#include "filetypes.h"
#include "htmlnorm.h"
#include "untar.h"
#include "special.h"
#include "binhex.h"
/* #include "uuencode.h" */
#include "tnef.h"
#include "sis.h"
#include "pdf.h"
#include "str.h"
#include "mspack.h"
#include "cab.h"
#include "rtf.h"
#include "unarj.h"
#include "nsis/nulsft.h"
#include "autoit.h"
#include "textnorm.h"
#include <zlib.h>
#include "unzip.h"
#include "dlp.h"
#include "default.h"
#include "cpio.h"
#include "macho.h"
#include "ishield.h"
#include "7z_iface.h"
#include "fmap.h"
#include "cache.h"
#include "events.h"
#include "swf.h"
#include "jpeg.h"
#include "png.h"
#include "iso9660.h"
#ifdef HAVE_BZLIB_H
#include <bzlib.h>
#endif
#if defined(HAVE_READDIR_R_3) || defined(HAVE_READDIR_R_2)
#include <limits.h>
#include <stddef.h>
#endif
static int cli_scanfile(const char *filename, cli_ctx *ctx);
static int cli_scandir(const char *dirname, cli_ctx *ctx)
{
DIR *dd;
struct dirent *dent;
#if defined(HAVE_READDIR_R_3) || defined(HAVE_READDIR_R_2)
union {
struct dirent d;
char b[offsetof(struct dirent, d_name) + NAME_MAX + 1];
} result;
#endif
STATBUF statbuf;
char *fname;
unsigned int viruses_found = 0;
if((dd = opendir(dirname)) != NULL) {
#ifdef HAVE_READDIR_R_3
while(!readdir_r(dd, &result.d, &dent) && dent) {
#elif defined(HAVE_READDIR_R_2)
while((dent = (struct dirent *) readdir_r(dd, &result.d))) {
#else
while((dent = readdir(dd))) {
#endif
if(dent->d_ino)
{
if(strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..")) {
/* build the full name */
fname = cli_malloc(strlen(dirname) + strlen(dent->d_name) + 2);
if(!fname) {
closedir(dd);
return CL_EMEM;
}
sprintf(fname, "%s"PATHSEP"%s", dirname, dent->d_name);
/* stat the file */
if(LSTAT(fname, &statbuf) != -1) {
if(S_ISDIR(statbuf.st_mode) && !S_ISLNK(statbuf.st_mode)) {
if(cli_scandir(fname, ctx) == CL_VIRUS) {
free(fname);
if (SCAN_ALL) {
viruses_found++;
continue;
}
closedir(dd);
return CL_VIRUS;
}
} else {
if(S_ISREG(statbuf.st_mode)) {
if(cli_scanfile(fname, ctx) == CL_VIRUS) {
free(fname);
if (SCAN_ALL) {
viruses_found++;
continue;
}
closedir(dd);
return CL_VIRUS;
}
}
}
}
free(fname);
}
}
}
} else {
cli_dbgmsg("cli_scandir: Can't open directory %s.\n", dirname);
return CL_EOPEN;
}
closedir(dd);
if (SCAN_ALL && viruses_found)
return CL_VIRUS;
return CL_CLEAN;
}
static int cli_unrar_scanmetadata(int desc, unrar_metadata_t *metadata, cli_ctx *ctx, unsigned int files, uint32_t* sfx_check)
{
int ret = CL_SUCCESS;
if(files == 1 && sfx_check) {
if(*sfx_check == metadata->crc)
return CL_BREAK;/* break extract loop */
else
*sfx_check = metadata->crc;
}
cli_dbgmsg("RAR: %s, crc32: 0x%x, encrypted: %u, compressed: %u, normal: %u, method: %u, ratio: %u\n",
metadata->filename, metadata->crc, metadata->encrypted, (unsigned int) metadata->pack_size,
(unsigned int) metadata->unpack_size, metadata->method,
metadata->pack_size ? (unsigned int) (metadata->unpack_size / metadata->pack_size) : 0);
if(cli_matchmeta(ctx, metadata->filename, metadata->pack_size, metadata->unpack_size, metadata->encrypted, files, metadata->crc, NULL) == CL_VIRUS)
return CL_VIRUS;
if(DETECT_ENCRYPTED && metadata->encrypted) {
cli_dbgmsg("RAR: Encrypted files found in archive.\n");
ret = cli_scandesc(desc, ctx, 0, 0, NULL, AC_SCAN_VIR, NULL);
if(ret != CL_VIRUS) {
cli_append_virus(ctx, "Heuristics.Encrypted.RAR");
return CL_VIRUS;
}
}
return ret;
}
static int cli_scanrar(int desc, cli_ctx *ctx, off_t sfx_offset, uint32_t *sfx_check)
{
int ret = CL_CLEAN;
unrar_metadata_t *metadata, *metadata_tmp;
char *dir;
unrar_state_t rar_state;
unsigned int viruses_found = 0;
cli_dbgmsg("in scanrar()\n");
if(sfx_offset)
if(lseek(desc, sfx_offset, SEEK_SET) == -1)
return CL_ESEEK;
/* generate the temporary directory */
if(!(dir = cli_gentemp(ctx->engine->tmpdir)))
return CL_EMEM;
if(mkdir(dir, 0700)) {
cli_dbgmsg("RAR: Can't create temporary directory %s\n", dir);
free(dir);
return CL_ETMPDIR;
}
if((ret = cli_unrar_open(desc, dir, &rar_state)) != UNRAR_OK) {
if(!ctx->engine->keeptmp)
cli_rmdirs(dir);
free(dir);
if(ret == UNRAR_PASSWD) {
cli_dbgmsg("RAR: Encrypted main header\n");
if(DETECT_ENCRYPTED) {
lseek(desc, 0, SEEK_SET);
ret = cli_scandesc(desc, ctx, 0, 0, NULL, AC_SCAN_VIR, NULL);
if(ret != CL_VIRUS)
cli_append_virus(ctx, "Heuristics.Encrypted.RAR");
return CL_VIRUS;
}
return CL_CLEAN;
} if(ret == UNRAR_EMEM) {
return CL_EMEM;
} else {
return CL_EUNPACK;
}
}
do {
int rc;
rar_state.ofd = -1;
ret = cli_unrar_extract_next_prepare(&rar_state,dir);
if(ret != UNRAR_OK) {
if(ret == UNRAR_BREAK)
ret = CL_BREAK;
else if(ret == UNRAR_EMEM)
ret = CL_EMEM;
else
ret = CL_EUNPACK;
break;
}
if(ctx->engine->maxscansize && ctx->scansize >= ctx->engine->maxscansize) {
free(rar_state.file_header->filename);
free(rar_state.file_header);
ret = CL_CLEAN;
break;
}
if(ctx->engine->maxscansize && ctx->scansize + ctx->engine->maxfilesize >= ctx->engine->maxscansize)
rar_state.maxfilesize = ctx->engine->maxscansize - ctx->scansize;
else
rar_state.maxfilesize = ctx->engine->maxfilesize;
ret = cli_unrar_extract_next(&rar_state,dir);
if(ret == UNRAR_OK)
ret = CL_SUCCESS;
else if(ret == UNRAR_EMEM)
ret = CL_EMEM;
else
ret = CL_EFORMAT;
if(rar_state.ofd > 0) {
lseek(rar_state.ofd,0,SEEK_SET);
rc = cli_magic_scandesc(rar_state.ofd,ctx);
close(rar_state.ofd);
if(!ctx->engine->keeptmp)
if (cli_unlink(rar_state.filename)) ret = CL_EUNLINK;
if(rc == CL_VIRUS ) {
cli_dbgmsg("RAR: infected with %s\n", cli_get_last_virus(ctx));
ret = CL_VIRUS;
viruses_found++;
}
}
if(ret == CL_VIRUS) {
if(SCAN_ALL)
ret = CL_SUCCESS;
else
break;
}
if(ret == CL_SUCCESS)
ret = cli_unrar_scanmetadata(desc,rar_state.metadata_tail, ctx, rar_state.file_count, sfx_check);
} while(ret == CL_SUCCESS);
if(ret == CL_BREAK)
ret = CL_CLEAN;
metadata = metadata_tmp = rar_state.metadata;
if(cli_scandir(rar_state.comment_dir, ctx) == CL_VIRUS)
ret = CL_VIRUS;
cli_unrar_close(&rar_state);
if(!ctx->engine->keeptmp)
cli_rmdirs(dir);
free(dir);
metadata = metadata_tmp;
while (metadata) {
metadata_tmp = metadata->next;
free(metadata->filename);
free(metadata);
metadata = metadata_tmp;
}
cli_dbgmsg("RAR: Exit code: %d\n", ret);
if (SCAN_ALL && viruses_found)
return CL_VIRUS;
return ret;
}
static int cli_scanarj(cli_ctx *ctx, off_t sfx_offset, uint32_t *sfx_check)
{
int ret = CL_CLEAN, rc, file = 0;
arj_metadata_t metadata;
char *dir;
cli_dbgmsg("in cli_scanarj()\n");
/* generate the temporary directory */
if(!(dir = cli_gentemp(ctx->engine->tmpdir)))
return CL_EMEM;
if(mkdir(dir, 0700)) {
cli_dbgmsg("ARJ: Can't create temporary directory %s\n", dir);
free(dir);
return CL_ETMPDIR;
}
ret = cli_unarj_open(*ctx->fmap, dir, &metadata, sfx_offset);
if (ret != CL_SUCCESS) {
if(!ctx->engine->keeptmp)
cli_rmdirs(dir);
free(dir);
cli_dbgmsg("ARJ: Error: %s\n", cl_strerror(ret));
return ret;
}
do {
metadata.filename = NULL;
ret = cli_unarj_prepare_file(dir, &metadata);
if (ret != CL_SUCCESS) {
break;
}
file++;
if(cli_matchmeta(ctx, metadata.filename, metadata.comp_size, metadata.orig_size, metadata.encrypted, file, 0, NULL) == CL_VIRUS)
return CL_VIRUS;
if ((ret = cli_checklimits("ARJ", ctx, metadata.orig_size, metadata.comp_size, 0))!=CL_CLEAN) {
ret = CL_SUCCESS;
if (metadata.filename)
free(metadata.filename);
continue;
}
ret = cli_unarj_extract_file(dir, &metadata);
if (metadata.ofd >= 0) {
lseek(metadata.ofd, 0, SEEK_SET);
rc = cli_magic_scandesc(metadata.ofd, ctx);
close(metadata.ofd);
if (rc == CL_VIRUS) {
cli_dbgmsg("ARJ: infected with %s\n", cli_get_last_virus(ctx));
ret = CL_VIRUS;
if (metadata.filename) {
free(metadata.filename);
metadata.filename = NULL;
}
break;
}
}
if (metadata.filename) {
free(metadata.filename);
metadata.filename = NULL;
}
} while(ret == CL_SUCCESS);
if(!ctx->engine->keeptmp)
cli_rmdirs(dir);
free(dir);
if (metadata.filename) {
free(metadata.filename);
}
cli_dbgmsg("ARJ: Exit code: %d\n", ret);
if (ret == CL_BREAK)
ret = CL_CLEAN;
return ret;
}
static int cli_scangzip_with_zib_from_the_80s(cli_ctx *ctx, unsigned char *buff) {
int fd, ret, outsize = 0, bytes;
fmap_t *map = *ctx->fmap;
char *tmpname;
gzFile gz;
fd = dup(fmap_fd(map));
if(fd < 0)
return CL_EDUP;
if(!(gz = gzdopen(fd, "rb"))) {
close(fd);
return CL_EOPEN;
}
if((ret = cli_gentempfd(ctx->engine->tmpdir, &tmpname, &fd)) != CL_SUCCESS) {
cli_dbgmsg("GZip: Can't generate temporary file.\n");
gzclose(gz);
close(fd);
return ret;
}
while((bytes = gzread(gz, buff, FILEBUFF)) > 0) {
outsize += bytes;
if(cli_checklimits("GZip", ctx, outsize, 0, 0)!=CL_CLEAN)
break;
if(cli_writen(fd, buff, bytes) != bytes) {
close(fd);
gzclose(gz);
if(cli_unlink(tmpname)) {
free(tmpname);
return CL_EUNLINK;
}
free(tmpname);
return CL_EWRITE;
}
}
gzclose(gz);
if((ret = cli_magic_scandesc(fd, ctx)) == CL_VIRUS) {
cli_dbgmsg("GZip: Infected with %s\n", cli_get_last_virus(ctx));
close(fd);
if(!ctx->engine->keeptmp) {
if (cli_unlink(tmpname)) {
free(tmpname);
return CL_EUNLINK;
}
}
free(tmpname);
return CL_VIRUS;
}
close(fd);
if(!ctx->engine->keeptmp)
if (cli_unlink(tmpname)) ret = CL_EUNLINK;
free(tmpname);
return ret;
}
static int cli_scangzip(cli_ctx *ctx)
{
int fd, ret = CL_CLEAN;
unsigned char buff[FILEBUFF];
char *tmpname;
z_stream z;
size_t at = 0, outsize = 0;
fmap_t *map = *ctx->fmap;
cli_dbgmsg("in cli_scangzip()\n");
memset(&z, 0, sizeof(z));
if((ret = inflateInit2(&z, MAX_WBITS + 16)) != Z_OK) {
cli_dbgmsg("GZip: InflateInit failed: %d\n", ret);
return cli_scangzip_with_zib_from_the_80s(ctx, buff);
}
if((ret = cli_gentempfd(ctx->engine->tmpdir, &tmpname, &fd)) != CL_SUCCESS) {
cli_dbgmsg("GZip: Can't generate temporary file.\n");
inflateEnd(&z);
return ret;
}
while (at < map->len) {
unsigned int bytes = MIN(map->len - at, map->pgsz);
if(!(z.next_in = (void*)fmap_need_off_once(map, at, bytes))) {
cli_dbgmsg("GZip: Can't read %u bytes @ %lu.\n", bytes, (long unsigned)at);
inflateEnd(&z);
close(fd);
if (cli_unlink(tmpname)) {
free(tmpname);
return CL_EUNLINK;
}
free(tmpname);
return CL_EREAD;
}
at += bytes;
z.avail_in = bytes;
do {
int inf;
z.avail_out = sizeof(buff);
z.next_out = buff;
inf = inflate(&z, Z_NO_FLUSH);
if(inf != Z_OK && inf != Z_STREAM_END && inf != Z_BUF_ERROR) {
cli_dbgmsg("GZip: Bad stream.\n");
at = map->len;
break;
}
if(cli_writen(fd, buff, sizeof(buff) - z.avail_out) < 0) {
inflateEnd(&z);
close(fd);
if (cli_unlink(tmpname)) {
free(tmpname);
return CL_EUNLINK;
}
free(tmpname);
return CL_EWRITE;
}
outsize += sizeof(buff) - z.avail_out;
if(cli_checklimits("GZip", ctx, outsize, 0, 0)!=CL_CLEAN) {
at = map->len;
break;
}
if(inf == Z_STREAM_END) {
at -= z.avail_in;
inflateReset(&z);
break;
}
} while (z.avail_out == 0);
}
inflateEnd(&z);
if((ret = cli_magic_scandesc(fd, ctx)) == CL_VIRUS) {
cli_dbgmsg("GZip: Infected with %s\n", cli_get_last_virus(ctx));
close(fd);
if(!ctx->engine->keeptmp) {
if (cli_unlink(tmpname)) {
free(tmpname);
return CL_EUNLINK;
}
}
free(tmpname);
return CL_VIRUS;
}
close(fd);
if(!ctx->engine->keeptmp)
if (cli_unlink(tmpname)) ret = CL_EUNLINK;
free(tmpname);
return ret;
}
#ifndef HAVE_BZLIB_H
static int cli_scanbzip(cli_ctx *ctx) {
cli_warnmsg("cli_scanbzip: bzip2 support not compiled in\n");
return CL_CLEAN;
}
#else
#ifdef NOBZ2PREFIX
#define BZ2_bzDecompressInit bzDecompressInit
#define BZ2_bzDecompress bzDecompress
#define BZ2_bzDecompressEnd bzDecompressEnd
#endif
static int cli_scanbzip(cli_ctx *ctx)
{
int ret = CL_CLEAN, fd, rc;
unsigned long int size = 0;
char *tmpname;
bz_stream strm;
size_t off = 0;
size_t avail;
char buf[FILEBUFF];
memset(&strm, 0, sizeof(strm));
strm.next_out = buf;
strm.avail_out = sizeof(buf);
rc = BZ2_bzDecompressInit(&strm, 0, 0);
if (BZ_OK != rc) {
cli_dbgmsg("Bzip: DecompressInit failed: %d\n", rc);
return CL_EOPEN;
}
if((ret = cli_gentempfd(ctx->engine->tmpdir, &tmpname, &fd))) {
cli_dbgmsg("Bzip: Can't generate temporary file.\n");
BZ2_bzDecompressEnd(&strm);
return ret;
}
do {
if (!strm.avail_in) {
strm.next_in = (void*)fmap_need_off_once_len(*ctx->fmap, off, FILEBUFF, &avail);
strm.avail_in = avail;
off += avail;
if (!strm.avail_in) {
cli_dbgmsg("Bzip: premature end of compressed stream\n");
break;
}
}
rc = BZ2_bzDecompress(&strm);
if (BZ_OK != rc && BZ_STREAM_END != rc) {
cli_dbgmsg("Bzip: decompress error: %d\n", rc);
break;
}
if (!strm.avail_out || BZ_STREAM_END == rc) {
size += sizeof(buf) - strm.avail_out;
if(cli_checklimits("Bzip", ctx, size + FILEBUFF, 0, 0)!=CL_CLEAN)
break;
if(cli_writen(fd, buf, sizeof(buf) - strm.avail_out) != sizeof(buf) - strm.avail_out) {
cli_dbgmsg("Bzip: Can't write to file.\n");
BZ2_bzDecompressEnd(&strm);
close(fd);
if(!ctx->engine->keeptmp) {
if (cli_unlink(tmpname)) {
free(tmpname);
return CL_EUNLINK;
}
}
free(tmpname);
return CL_EWRITE;
}
strm.next_out = buf;
strm.avail_out = sizeof(buf);
}
} while (BZ_STREAM_END != rc);
BZ2_bzDecompressEnd(&strm);
if(ret == CL_VIRUS) {
close(fd);
if(!ctx->engine->keeptmp)
if (cli_unlink(tmpname)) ret = CL_EUNLINK;
free(tmpname);
return ret;
}
if((ret = cli_magic_scandesc(fd, ctx)) == CL_VIRUS ) {
cli_dbgmsg("Bzip: Infected with %s\n", cli_get_last_virus(ctx));
}
close(fd);
if(!ctx->engine->keeptmp)
if (cli_unlink(tmpname)) ret = CL_EUNLINK;
free(tmpname);
return ret;
}
#endif
static int cli_scanszdd(cli_ctx *ctx)
{
int ofd, ret;
char *tmpname;
cli_dbgmsg("in cli_scanszdd()\n");
if((ret = cli_gentempfd(ctx->engine->tmpdir, &tmpname, &ofd))) {
cli_dbgmsg("MSEXPAND: Can't generate temporary file/descriptor\n");
return ret;
}
ret = cli_msexpand(ctx, ofd);
if(ret != CL_SUCCESS) { /* CL_VIRUS or some error */
close(ofd);
if(!ctx->engine->keeptmp)
if (cli_unlink(tmpname)) ret = CL_EUNLINK;
free(tmpname);
return ret;
}
cli_dbgmsg("MSEXPAND: Decompressed into %s\n", tmpname);
ret = cli_magic_scandesc(ofd, ctx);
close(ofd);
if(!ctx->engine->keeptmp)
if (cli_unlink(tmpname)) ret = CL_EUNLINK;
free(tmpname);
return ret;
}
static int cli_scanmscab(cli_ctx *ctx, off_t sfx_offset)
{
char *tempname;
int ret;
unsigned int files = 0;
struct cab_archive cab;
struct cab_file *file;
unsigned int corrupted_input;
unsigned int viruses_found = 0;
cli_dbgmsg("in cli_scanmscab()\n");
if((ret = cab_open(*ctx->fmap, sfx_offset, &cab)))
return ret;
for(file = cab.files; file; file = file->next) {
files++;
if(cli_matchmeta(ctx, file->name, 0, file->length, 0, files, 0, NULL) == CL_VIRUS) {
if (!SCAN_ALL) {
ret = CL_VIRUS;
break;
}
viruses_found++;
}
if(ctx->engine->maxscansize && ctx->scansize >= ctx->engine->maxscansize) {
ret = CL_CLEAN;
break;
}
if(!(tempname = cli_gentemp(ctx->engine->tmpdir))) {
ret = CL_EMEM;
break;
}
if(ctx->engine->maxscansize && ctx->scansize + ctx->engine->maxfilesize >= ctx->engine->maxscansize)
file->max_size = ctx->engine->maxscansize - ctx->scansize;
else
file->max_size = ctx->engine->maxfilesize ? ctx->engine->maxfilesize : 0xffffffff;
cli_dbgmsg("CAB: Extracting file %s to %s, size %u, max_size: %u\n", file->name, tempname, file->length, (unsigned int) file->max_size);
file->written_size = 0;
if((ret = cab_extract(file, tempname))) {
cli_dbgmsg("CAB: Failed to extract file: %s\n", cl_strerror(ret));
} else {
corrupted_input = ctx->corrupted_input;
if(file->length != file->written_size) {
cli_dbgmsg("CAB: Length from header %u but wrote %u bytes\n", (unsigned int) file->length, (unsigned int) file->written_size);
ctx->corrupted_input = 1;
}
ret = cli_scanfile(tempname, ctx);
ctx->corrupted_input = corrupted_input;
}
if(!ctx->engine->keeptmp) {
if (!access(tempname, R_OK) && cli_unlink(tempname)) {
free(tempname);
ret = CL_EUNLINK;
break;
}
}
free(tempname);
if(ret == CL_VIRUS) {
if (SCAN_ALL)
viruses_found++;
else
break;
}
}
cab_free(&cab);
if (viruses_found)
return CL_VIRUS;
return ret;
}
static int vba_scandata(const unsigned char *data, unsigned int len, cli_ctx *ctx)
{
struct cli_matcher *groot = ctx->engine->root[0];
struct cli_matcher *troot = ctx->engine->root[2];
struct cli_ac_data gmdata, tmdata;
struct cli_ac_data *mdata[2];
int ret;
unsigned int viruses_found = 0;
if((ret = cli_ac_initdata(&tmdata, troot->ac_partsigs, troot->ac_lsigs, troot->ac_reloff_num, CLI_DEFAULT_AC_TRACKLEN)))
return ret;
if((ret = cli_ac_initdata(&gmdata, groot->ac_partsigs, groot->ac_lsigs, groot->ac_reloff_num, CLI_DEFAULT_AC_TRACKLEN))) {
cli_ac_freedata(&tmdata);
return ret;
}
mdata[0] = &tmdata;
mdata[1] = &gmdata;
ret = cli_scanbuff(data, len, 0, ctx, CL_TYPE_MSOLE2, mdata);
if(ret != CL_VIRUS || SCAN_ALL) {
if (SCAN_ALL)
viruses_found++;
ret = cli_lsig_eval(ctx, troot, &tmdata, NULL, NULL);
if(ret != CL_VIRUS || SCAN_ALL)
if (SCAN_ALL)
viruses_found++;
ret = cli_lsig_eval(ctx, groot, &gmdata, NULL, NULL);
}
cli_ac_freedata(&tmdata);
cli_ac_freedata(&gmdata);
if (viruses_found)
return CL_VIRUS;
return ret;
}
static int cli_vba_scandir(const char *dirname, cli_ctx *ctx, struct uniq *U)
{
int ret = CL_CLEAN, i, j, fd, data_len, hasmacros = 0;
vba_project_t *vba_project;
DIR *dd;
struct dirent *dent;
#if defined(HAVE_READDIR_R_3) || defined(HAVE_READDIR_R_2)
union {
struct dirent d;
char b[offsetof(struct dirent, d_name) + NAME_MAX + 1];
} result;
#endif
STATBUF statbuf;
char *fullname, vbaname[1024];
unsigned char *data;
char *hash;
uint32_t hashcnt;
unsigned int viruses_found = 0;
cli_dbgmsg("VBADir: %s\n", dirname);
hashcnt = uniq_get(U, "_vba_project", 12, NULL);
while(hashcnt--) {
if(!(vba_project = (vba_project_t *)cli_vba_readdir(dirname, U, hashcnt))) continue;
for(i = 0; i < vba_project->count; i++) {
for(j = 0; (unsigned int)j < vba_project->colls[i]; j++) {
snprintf(vbaname, 1024, "%s"PATHSEP"%s_%u", vba_project->dir, vba_project->name[i], j);
vbaname[sizeof(vbaname)-1] = '\0';
fd = open(vbaname, O_RDONLY|O_BINARY);
if(fd == -1) continue;
cli_dbgmsg("VBADir: Decompress VBA project '%s_%u'\n", vba_project->name[i], j);
data = (unsigned char *)cli_vba_inflate(fd, vba_project->offset[i], &data_len);
close(fd);
hasmacros++;
if(!data) {
cli_dbgmsg("VBADir: WARNING: VBA project '%s_%u' decompressed to NULL\n", vba_project->name[i], j);
} else {
/* cli_dbgmsg("Project content:\n%s", data); */
if(ctx->scanned)
*ctx->scanned += data_len / CL_COUNT_PRECISION;
if(vba_scandata(data, data_len, ctx) == CL_VIRUS) {
if (SCAN_ALL)
viruses_found++;
else {
free(data);
ret = CL_VIRUS;
break;
}
}
free(data);
}
}
}
free(vba_project->name);
free(vba_project->colls);
free(vba_project->dir);
free(vba_project->offset);
free(vba_project);
if (ret == CL_VIRUS && !SCAN_ALL)
break;
}
if((ret == CL_CLEAN || (ret == CL_VIRUS && SCAN_ALL)) &&
(hashcnt = uniq_get(U, "powerpoint document", 19, &hash))) {
while(hashcnt--) {
snprintf(vbaname, 1024, "%s"PATHSEP"%s_%u", dirname, hash, hashcnt);
vbaname[sizeof(vbaname)-1] = '\0';
fd = open(vbaname, O_RDONLY|O_BINARY);
if (fd == -1) continue;
if ((fullname = cli_ppt_vba_read(fd, ctx))) {
if(cli_scandir(fullname, ctx) == CL_VIRUS) {
ret = CL_VIRUS;
viruses_found++;
}
if(!ctx->engine->keeptmp)
cli_rmdirs(fullname);
free(fullname);
}
close(fd);
}
}
if ((ret == CL_CLEAN || (ret == CL_VIRUS && SCAN_ALL)) &&
(hashcnt = uniq_get(U, "worddocument", 12, &hash))) {
while(hashcnt--) {
snprintf(vbaname, sizeof(vbaname), "%s"PATHSEP"%s_%u", dirname, hash, hashcnt);
vbaname[sizeof(vbaname)-1] = '\0';
fd = open(vbaname, O_RDONLY|O_BINARY);
if (fd == -1) continue;
if (!(vba_project = (vba_project_t *)cli_wm_readdir(fd))) {
close(fd);
continue;
}
for (i = 0; i < vba_project->count; i++) {
cli_dbgmsg("VBADir: Decompress WM project macro:%d key:%d length:%d\n", i, vba_project->key[i], vba_project->length[i]);
data = (unsigned char *)cli_wm_decrypt_macro(fd, vba_project->offset[i], vba_project->length[i], vba_project->key[i]);
if(!data) {
cli_dbgmsg("VBADir: WARNING: WM project '%s' macro %d decrypted to NULL\n", vba_project->name[i], i);
} else {
cli_dbgmsg("Project content:\n%s", data);
if(ctx->scanned)
*ctx->scanned += vba_project->length[i] / CL_COUNT_PRECISION;
if(vba_scandata(data, vba_project->length[i], ctx) == CL_VIRUS) {
if (SCAN_ALL)
viruses_found++;
else {
free(data);
ret = CL_VIRUS;
break;
}
}
free(data);
}
}
close(fd);
free(vba_project->name);
free(vba_project->colls);
free(vba_project->dir);
free(vba_project->offset);
free(vba_project->key);
free(vba_project->length);
free(vba_project);
if(ret == CL_VIRUS) {
if (SCAN_ALL)
viruses_found++;
else
break;
}
}
}
if(ret != CL_CLEAN && !(ret == CL_VIRUS && SCAN_ALL))
return ret;
/* Check directory for embedded OLE objects */
hashcnt = uniq_get(U, "_1_ole10native", 14, &hash);
while(hashcnt--) {
snprintf(vbaname, sizeof(vbaname), "%s"PATHSEP"%s_%u", dirname, hash, hashcnt);
vbaname[sizeof(vbaname)-1] = '\0';
fd = open(vbaname, O_RDONLY|O_BINARY);
if (fd >= 0) {
ret = cli_scan_ole10(fd, ctx);
close(fd);
if(ret != CL_CLEAN && !(ret == CL_VIRUS && SCAN_ALL))
return ret;
}
}
/* ACAB: since we now hash filenames and handle collisions we
* could avoid recursion by removing the block below and by
* flattening the paths in ole2_walk_property_tree (case 1) */
if((dd = opendir(dirname)) != NULL) {
#ifdef HAVE_READDIR_R_3
while(!readdir_r(dd, &result.d, &dent) && dent) {
#elif defined(HAVE_READDIR_R_2)
while((dent = (struct dirent *) readdir_r(dd, &result.d))) {
#else
while((dent = readdir(dd))) {
#endif
if(dent->d_ino)
{
if(strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..")) {
/* build the full name */
fullname = cli_malloc(strlen(dirname) + strlen(dent->d_name) + 2);
if(!fullname) {
ret = CL_EMEM;
break;
}
sprintf(fullname, "%s"PATHSEP"%s", dirname, dent->d_name);
/* stat the file */
if(LSTAT(fullname, &statbuf) != -1) {
if(S_ISDIR(statbuf.st_mode) && !S_ISLNK(statbuf.st_mode))
if (cli_vba_scandir(fullname, ctx, U) == CL_VIRUS) {
if (SCAN_ALL)
viruses_found++;
else {
ret = CL_VIRUS;
free(fullname);
break;
}
}
}
free(fullname);
}
}
}
} else {
cli_dbgmsg("VBADir: Can't open directory %s.\n", dirname);
return CL_EOPEN;
}
closedir(dd);
if(BLOCK_MACROS && hasmacros) {
cli_append_virus(ctx, "Heuristics.OLE2.ContainsMacros");
ret = CL_VIRUS;
viruses_found++;
}
if (SCAN_ALL && viruses_found)
return CL_VIRUS;
return ret;
}
static int cli_scanhtml(cli_ctx *ctx)
{
char *tempname, fullname[1024];
int ret=CL_CLEAN, fd;
fmap_t *map = *ctx->fmap;
unsigned int viruses_found = 0;
cli_dbgmsg("in cli_scanhtml()\n");
/* Because HTML detection is FP-prone and html_normalise_fd() needs to
* mmap the file don't normalise files larger than 10 MB.
*/
if(map->len > 10485760) {
cli_dbgmsg("cli_scanhtml: exiting (file larger than 10 MB)\n");
return CL_CLEAN;
}
if(!(tempname = cli_gentemp(ctx->engine->tmpdir)))
return CL_EMEM;
if(mkdir(tempname, 0700)) {
cli_errmsg("cli_scanhtml: Can't create temporary directory %s\n", tempname);
free(tempname);
return CL_ETMPDIR;
}
cli_dbgmsg("cli_scanhtml: using tempdir %s\n", tempname);
html_normalise_map(map, tempname, NULL, ctx->dconf);
snprintf(fullname, 1024, "%s"PATHSEP"nocomment.html", tempname);
fd = open(fullname, O_RDONLY|O_BINARY);
if (fd >= 0) {
if ((ret = cli_scandesc(fd, ctx, CL_TYPE_HTML, 0, NULL, AC_SCAN_VIR, NULL)) == CL_VIRUS)
viruses_found++;
close(fd);
}
if((ret == CL_CLEAN || (ret == CL_VIRUS && SCAN_ALL)) && map->len < 2097152) {
/* limit to 2 MB, we're not interesting in scanning large files in notags form */
/* TODO: don't even create notags if file is over 2 MB */
snprintf(fullname, 1024, "%s"PATHSEP"notags.html", tempname);
fd = open(fullname, O_RDONLY|O_BINARY);
if(fd >= 0) {
if ((ret = cli_scandesc(fd, ctx, CL_TYPE_HTML, 0, NULL, AC_SCAN_VIR, NULL)) == CL_VIRUS)
viruses_found++;
close(fd);
}
}
if(ret == CL_CLEAN || (ret == CL_VIRUS && SCAN_ALL)) {
snprintf(fullname, 1024, "%s"PATHSEP"javascript", tempname);
fd = open(fullname, O_RDONLY|O_BINARY);
if(fd >= 0) {
if ((ret = cli_scandesc(fd, ctx, CL_TYPE_HTML, 0, NULL, AC_SCAN_VIR, NULL)) == CL_VIRUS)
viruses_found++;
if (ret == CL_CLEAN || (ret == CL_VIRUS && SCAN_ALL)) {
if ((ret = cli_scandesc(fd, ctx, CL_TYPE_TEXT_ASCII, 0, NULL, AC_SCAN_VIR, NULL)) == CL_VIRUS)
viruses_found++;
}
close(fd);
}
}
if (ret == CL_CLEAN || (ret == CL_VIRUS && SCAN_ALL)) {
snprintf(fullname, 1024, "%s"PATHSEP"rfc2397", tempname);
ret = cli_scandir(fullname, ctx);
}
if(!ctx->engine->keeptmp)
cli_rmdirs(tempname);
free(tempname);
if (SCAN_ALL && viruses_found)
return CL_VIRUS;
return ret;
}
static int cli_scanscript(cli_ctx *ctx)
{
const unsigned char *buff;
unsigned char* normalized;
struct text_norm_state state;
char *tmpname = NULL;
int ofd = -1, ret;
struct cli_matcher *troot;
uint32_t maxpatlen, offset = 0;
struct cli_matcher *groot;
struct cli_ac_data gmdata, tmdata;
struct cli_ac_data *mdata[2];
fmap_t *map = *ctx->fmap;
size_t at = 0;
unsigned int viruses_found = 0;
if (!ctx || !ctx->engine->root)
return CL_ENULLARG;
groot = ctx->engine->root[0];
troot = ctx->engine->root[7];
maxpatlen = troot ? troot->maxpatlen : 0;
cli_dbgmsg("in cli_scanscript()\n");
if(map->len > 5242880) {
cli_dbgmsg("cli_scanscript: exiting (file larger than 5 MB)\n");
return CL_CLEAN;
}
/* dump to disk only if explicitly asked to,
* otherwise we can process just in-memory */
if(ctx->engine->keeptmp) {
if((ret = cli_gentempfd(ctx->engine->tmpdir, &tmpname, &ofd))) {
cli_dbgmsg("cli_scanscript: Can't generate temporary file/descriptor\n");
return ret;
}
cli_dbgmsg("cli_scanscript: saving normalized file to %s\n", tmpname);
}
if(!(normalized = cli_malloc(SCANBUFF + maxpatlen))) {
cli_dbgmsg("cli_scanscript: Unable to malloc %u bytes\n", SCANBUFF);
return CL_EMEM;
}
text_normalize_init(&state, normalized, SCANBUFF + maxpatlen);
ret = CL_CLEAN;
if ((ret = cli_ac_initdata(&tmdata, troot->ac_partsigs, troot->ac_lsigs, troot->ac_reloff_num, CLI_DEFAULT_AC_TRACKLEN)))
return ret;
if ((ret = cli_ac_initdata(&gmdata, groot->ac_partsigs, groot->ac_lsigs, groot->ac_reloff_num, CLI_DEFAULT_AC_TRACKLEN))) {
cli_ac_freedata(&tmdata);
return ret;
}
mdata[0] = &tmdata;
mdata[1] = &gmdata;
while(1) {
size_t len = MIN(map->pgsz, map->len - at);
buff = fmap_need_off_once(map, at, len);
at += len;
if(!buff || !len || state.out_pos + len > state.out_len) {
/* flush if error/EOF, or too little buffer space left */
if((ofd != -1) && (write(ofd, state.out, state.out_pos) == -1)) {
cli_errmsg("cli_scanscript: can't write to file %s\n",tmpname);
close(ofd);
ofd = -1;
/* we can continue to scan in memory */
}
/* when we flush the buffer also scan */
if(cli_scanbuff(state.out, state.out_pos, offset, ctx, CL_TYPE_TEXT_ASCII, mdata) == CL_VIRUS) {
if (SCAN_ALL)
viruses_found++;
else {
ret = CL_VIRUS;
break;
}
}
if(ctx->scanned)
*ctx->scanned += state.out_pos / CL_COUNT_PRECISION;
offset += state.out_pos;
/* carry over maxpatlen from previous buffer */
if (state.out_pos > maxpatlen)
memmove(state.out, state.out + state.out_pos - maxpatlen, maxpatlen);
text_normalize_reset(&state);
state.out_pos = maxpatlen;
}
if(!len) break;
if(!buff || text_normalize_buffer(&state, buff, len) != len) {
cli_dbgmsg("cli_scanscript: short read during normalizing\n");
}
}
if(ctx->engine->keeptmp) {
free(tmpname);
close(ofd);
}
free(normalized);
if(ret != CL_VIRUS || SCAN_ALL) {
if ((ret = cli_lsig_eval(ctx, troot, &tmdata, NULL, NULL)) == CL_VIRUS)
viruses_found++;
if(ret != CL_VIRUS || SCAN_ALL)
if ((ret = cli_lsig_eval(ctx, groot, &gmdata, NULL, NULL)) == CL_VIRUS)
viruses_found++;
}
cli_ac_freedata(&tmdata);
cli_ac_freedata(&gmdata);
if (SCAN_ALL && viruses_found)
return CL_VIRUS;
return ret;
}
static int cli_scanhtml_utf16(cli_ctx *ctx)
{
char *tempname, *decoded;
const char *buff;
int ret = CL_CLEAN, fd, bytes;
size_t at = 0;
fmap_t *map = *ctx->fmap;
cli_dbgmsg("in cli_scanhtml_utf16()\n");
if(!(tempname = cli_gentemp(ctx->engine->tmpdir)))
return CL_EMEM;
if((fd = open(tempname, O_RDWR|O_CREAT|O_TRUNC|O_BINARY, S_IRWXU)) < 0) {
cli_errmsg("cli_scanhtml_utf16: Can't create file %s\n", tempname);
free(tempname);
return CL_EOPEN;
}
cli_dbgmsg("cli_scanhtml_utf16: using tempfile %s\n", tempname);
while(at < map->len) {
bytes = MIN(map->len - at, map->pgsz * 16);
if(!(buff = fmap_need_off_once(map, at, bytes))) {
close(fd);
cli_unlink(tempname);
free(tempname);
return CL_EREAD;
}
at += bytes;
decoded = cli_utf16toascii(buff, bytes);
if(decoded) {
if(write(fd, decoded, bytes / 2) == -1) {
cli_errmsg("cli_scanhtml_utf16: Can't write to file %s\n", tempname);
free(decoded);
close(fd);
cli_unlink(tempname);
free(tempname);
return CL_EWRITE;
}
free(decoded);
}
}
*ctx->fmap = fmap(fd, 0, 0);
if(*ctx->fmap) {
ret = cli_scanhtml(ctx);
funmap(*ctx->fmap);
} else
cli_errmsg("cli_scanhtml_utf16: fmap of %s failed\n", tempname);
*ctx->fmap = map;
close(fd);
if(!ctx->engine->keeptmp) {
if (cli_unlink(tempname)) ret = CL_EUNLINK;
} else
cli_dbgmsg("cli_scanhtml_utf16: Decoded HTML data saved in %s\n", tempname);
free(tempname);
return ret;
}
static int cli_scanole2(cli_ctx *ctx)
{
char *dir;
int ret = CL_CLEAN;
struct uniq *vba = NULL;
cli_dbgmsg("in cli_scanole2()\n");
if(ctx->engine->maxreclevel && ctx->recursion >= ctx->engine->maxreclevel)
return CL_EMAXREC;
/* generate the temporary directory */
if(!(dir = cli_gentemp(ctx->engine->tmpdir)))
return CL_EMEM;
if(mkdir(dir, 0700)) {
cli_dbgmsg("OLE2: Can't create temporary directory %s\n", dir);
free(dir);
return CL_ETMPDIR;
}
ret = cli_ole2_extract(dir, ctx, &vba);
if(ret!=CL_CLEAN && ret!=CL_VIRUS) {
cli_dbgmsg("OLE2: %s\n", cl_strerror(ret));
if(!ctx->engine->keeptmp)
cli_rmdirs(dir);
free(dir);
return ret;
}
if (vba) {
ctx->recursion++;
ret = cli_vba_scandir(dir, ctx, vba);
uniq_free(vba);
if(ret != CL_VIRUS)
if(cli_scandir(dir, ctx) == CL_VIRUS)
ret = CL_VIRUS;
ctx->recursion--;
}
if(!ctx->engine->keeptmp)
cli_rmdirs(dir);
free(dir);
return ret;
}
static int cli_scantar(cli_ctx *ctx, unsigned int posix)
{
char *dir;
int ret = CL_CLEAN;
cli_dbgmsg("in cli_scantar()\n");
/* generate temporary directory */
if(!(dir = cli_gentemp(ctx->engine->tmpdir)))
return CL_EMEM;
if(mkdir(dir, 0700)) {
cli_errmsg("Tar: Can't create temporary directory %s\n", dir);
free(dir);
return CL_ETMPDIR;
}
ret = cli_untar(dir, posix, ctx);
if(!ctx->engine->keeptmp)
cli_rmdirs(dir);
free(dir);
return ret;
}
static int cli_scanmschm(cli_ctx *ctx)
{
int ret = CL_CLEAN, rc;
chm_metadata_t metadata;
char *dir;
unsigned int viruses_found = 0;
cli_dbgmsg("in cli_scanmschm()\n");
/* generate the temporary directory */
if(!(dir = cli_gentemp(ctx->engine->tmpdir)))
return CL_EMEM;
if(mkdir(dir, 0700)) {
cli_dbgmsg("CHM: Can't create temporary directory %s\n", dir);
free(dir);
return CL_ETMPDIR;
}
ret = cli_chm_open(dir, &metadata, ctx);
if (ret != CL_SUCCESS) {
if(!ctx->engine->keeptmp)
cli_rmdirs(dir);
free(dir);
cli_dbgmsg("CHM: Error: %s\n", cl_strerror(ret));
return ret;
}
do {
ret = cli_chm_prepare_file(&metadata);
if (ret != CL_SUCCESS) {
break;
}
ret = cli_chm_extract_file(dir, &metadata, ctx);
if (ret == CL_SUCCESS) {
rc = cli_magic_scandesc(metadata.ofd, ctx);
close(metadata.ofd);
if (rc == CL_VIRUS) {
cli_dbgmsg("CHM: infected with %s\n", cli_get_last_virus(ctx));
if (SCAN_ALL)
viruses_found++;
else {
ret = CL_VIRUS;
break;
}
}
}
} while(ret == CL_SUCCESS);
cli_chm_close(&metadata);
if(!ctx->engine->keeptmp)
cli_rmdirs(dir);
free(dir);
cli_dbgmsg("CHM: Exit code: %d\n", ret);
if (ret == CL_BREAK)
ret = CL_CLEAN;
if (SCAN_ALL && viruses_found)
return CL_VIRUS;
return ret;
}
static int cli_scanscrenc(cli_ctx *ctx)
{
char *tempname;
int ret = CL_CLEAN;
cli_dbgmsg("in cli_scanscrenc()\n");
if(!(tempname = cli_gentemp(ctx->engine->tmpdir)))
return CL_EMEM;
if(mkdir(tempname, 0700)) {
cli_dbgmsg("CHM: Can't create temporary directory %s\n", tempname);
free(tempname);
return CL_ETMPDIR;
}
if (html_screnc_decode(*ctx->fmap, tempname))
ret = cli_scandir(tempname, ctx);
if(!ctx->engine->keeptmp)
cli_rmdirs(tempname);
free(tempname);
return ret;
}
static int cli_scanriff(cli_ctx *ctx)
{
int ret = CL_CLEAN;
if(cli_check_riff_exploit(ctx) == 2) {
ret = CL_VIRUS;
cli_append_virus(ctx, "Heuristics.Exploit.W32.MS05-002");
}
return ret;
}
static int cli_scanjpeg(cli_ctx *ctx)
{
int ret = CL_CLEAN;
if(cli_check_jpeg_exploit(ctx, 0) == 1) {
ret = CL_VIRUS;
cli_append_virus(ctx, "Heuristics.Exploit.W32.MS04-028");
}
return ret;
}
static int cli_scancryptff(cli_ctx *ctx)
{
int ret = CL_CLEAN, ndesc;
unsigned int i;
const unsigned char *src;
unsigned char *dest = NULL;
char *tempfile;
size_t pos;
size_t bread;
/* Skip the CryptFF file header */
pos = 0x10;
if((dest = (unsigned char *) cli_malloc(FILEBUFF)) == NULL) {
cli_dbgmsg("CryptFF: Can't allocate memory\n");
return CL_EMEM;
}
if(!(tempfile = cli_gentemp(ctx->engine->tmpdir))) {
free(dest);
return CL_EMEM;
}
if((ndesc = open(tempfile, O_RDWR|O_CREAT|O_TRUNC|O_BINARY, S_IRWXU)) < 0) {
cli_errmsg("CryptFF: Can't create file %s\n", tempfile);
free(dest);
free(tempfile);
return CL_ECREAT;
}
for(; (src = fmap_need_off_once_len(*ctx->fmap, pos, FILEBUFF, &bread)) && bread; pos += bread) {
for (i=0;i<bread;i++)
dest[i] = src[i] ^ (unsigned char) 0xff;
if(cli_writen(ndesc, dest, bread) == -1) {
cli_dbgmsg("CryptFF: Can't write to descriptor %d\n", ndesc);
free(dest);
close(ndesc);
free(tempfile);
return CL_EWRITE;
}
}
free(dest);
cli_dbgmsg("CryptFF: Scanning decrypted data\n");
if((ret = cli_magic_scandesc(ndesc, ctx)) == CL_VIRUS)
cli_dbgmsg("CryptFF: Infected with %s\n", cli_get_last_virus(ctx));
close(ndesc);
if(ctx->engine->keeptmp)
cli_dbgmsg("CryptFF: Decompressed data saved in %s\n", tempfile);
else
if (cli_unlink(tempfile)) ret = CL_EUNLINK;
free(tempfile);
return ret;
}
static int cli_scanpdf(cli_ctx *ctx, off_t offset)
{
int ret;
char *dir = cli_gentemp(ctx->engine->tmpdir);
if(!dir)
return CL_EMEM;
if(mkdir(dir, 0700)) {
cli_dbgmsg("Can't create temporary directory for PDF file %s\n", dir);
free(dir);
return CL_ETMPDIR;
}
ret = cli_pdf(dir, ctx, offset);
if(!ctx->engine->keeptmp)
cli_rmdirs(dir);
free(dir);
return ret;
}
static int cli_scantnef(cli_ctx *ctx)
{
int ret;
char *dir = cli_gentemp(ctx->engine->tmpdir);
if(!dir)
return CL_EMEM;
if(mkdir(dir, 0700)) {
cli_dbgmsg("Can't create temporary directory for tnef file %s\n", dir);
free(dir);
return CL_ETMPDIR;
}
ret = cli_tnef(dir, ctx);
if(ret == CL_CLEAN)
ret = cli_scandir(dir, ctx);
if(!ctx->engine->keeptmp)
cli_rmdirs(dir);
free(dir);
return ret;
}
static int cli_scanuuencoded(cli_ctx *ctx)
{
int ret;
char *dir = cli_gentemp(ctx->engine->tmpdir);
if(!dir)
return CL_EMEM;
if(mkdir(dir, 0700)) {
cli_dbgmsg("Can't create temporary directory for uuencoded file %s\n", dir);
free(dir);
return CL_ETMPDIR;
}
ret = cli_uuencode(dir, *ctx->fmap);
if(ret == CL_CLEAN)
ret = cli_scandir(dir, ctx);
if(!ctx->engine->keeptmp)
cli_rmdirs(dir);
free(dir);
return ret;
}
static int cli_scanmail(cli_ctx *ctx)
{
char *dir;
int ret;
unsigned int viruses_found = 0;
cli_dbgmsg("Starting cli_scanmail(), recursion = %u\n", ctx->recursion);
/* generate the temporary directory */
if(!(dir = cli_gentemp(ctx->engine->tmpdir)))
return CL_EMEM;
if(mkdir(dir, 0700)) {
cli_dbgmsg("Mail: Can't create temporary directory %s\n", dir);
free(dir);
return CL_ETMPDIR;
}
/*
* Extract the attachments into the temporary directory
*/
if((ret = cli_mbox(dir, ctx))) {
if (ret == CL_VIRUS && SCAN_ALL)
viruses_found++;
else {
if(!ctx->engine->keeptmp)
cli_rmdirs(dir);
free(dir);
return ret;
}
}
ret = cli_scandir(dir, ctx);
if(!ctx->engine->keeptmp)
cli_rmdirs(dir);
free(dir);
if (SCAN_ALL && viruses_found)
return CL_VIRUS;
return ret;
}
static int cli_scan_structured(cli_ctx *ctx)
{
char buf[8192];
int result = 0;
unsigned int cc_count = 0;
unsigned int ssn_count = 0;
int done = 0;
fmap_t *map;
size_t pos = 0;
int (*ccfunc)(const unsigned char *buffer, int length);
int (*ssnfunc)(const unsigned char *buffer, int length);
unsigned int viruses_found;
if(ctx == NULL)
return CL_ENULLARG;
map = *ctx->fmap;
if(ctx->engine->min_cc_count == 1)
ccfunc = dlp_has_cc;
else
ccfunc = dlp_get_cc_count;
switch((ctx->options & CL_SCAN_STRUCTURED_SSN_NORMAL) | (ctx->options & CL_SCAN_STRUCTURED_SSN_STRIPPED)) {
case (CL_SCAN_STRUCTURED_SSN_NORMAL | CL_SCAN_STRUCTURED_SSN_STRIPPED):
if(ctx->engine->min_ssn_count == 1)
ssnfunc = dlp_has_ssn;
else
ssnfunc = dlp_get_ssn_count;
break;
case CL_SCAN_STRUCTURED_SSN_NORMAL:
if(ctx->engine->min_ssn_count == 1)
ssnfunc = dlp_has_normal_ssn;
else
ssnfunc = dlp_get_normal_ssn_count;
break;
case CL_SCAN_STRUCTURED_SSN_STRIPPED:
if(ctx->engine->min_ssn_count == 1)
ssnfunc = dlp_has_stripped_ssn;
else
ssnfunc = dlp_get_stripped_ssn_count;
break;
default:
ssnfunc = NULL;
}
while(!done && ((result = fmap_readn(map, buf, pos, 8191)) > 0)) {
pos += result;
if((cc_count += ccfunc((const unsigned char *)buf, result)) >= ctx->engine->min_cc_count)
done = 1;
if(ssnfunc && ((ssn_count += ssnfunc((const unsigned char *)buf, result)) >= ctx->engine->min_ssn_count))
done = 1;
}
if(cc_count != 0 && cc_count >= ctx->engine->min_cc_count) {
cli_dbgmsg("cli_scan_structured: %u credit card numbers detected\n", cc_count);
cli_append_virus(ctx,"Heuristics.Structured.CreditCardNumber");
if (SCAN_ALL)
viruses_found++;
else
return CL_VIRUS;
}
if(ssn_count != 0 && ssn_count >= ctx->engine->min_ssn_count) {
cli_dbgmsg("cli_scan_structured: %u social security numbers detected\n", ssn_count);
cli_append_virus(ctx,"Heuristics.Structured.SSN");
if (SCAN_ALL)
viruses_found++;
else
return CL_VIRUS;
}
if (SCAN_ALL && viruses_found)
return CL_VIRUS;
return CL_CLEAN;
}
static int cli_scanembpe(cli_ctx *ctx, off_t offset)
{
int fd, bytes, ret = CL_CLEAN;
unsigned long int size = 0, todo;
const char *buff;
char *tmpname;
fmap_t *map = *ctx->fmap;
unsigned int corrupted_input;
tmpname = cli_gentemp(ctx->engine->tmpdir);
if(!tmpname)
return CL_EMEM;
if((fd = open(tmpname, O_RDWR|O_CREAT|O_TRUNC|O_BINARY, S_IRWXU)) < 0) {
cli_errmsg("cli_scanembpe: Can't create file %s\n", tmpname);
free(tmpname);
return CL_ECREAT;
}
todo = map->len - offset;
while(1) {
bytes = MIN(todo, map->pgsz);
if(!bytes)
break;
if(!(buff = fmap_need_off_once(map, offset + size, bytes))) {
close(fd);
if(!ctx->engine->keeptmp) {
if (cli_unlink(tmpname)) {
free(tmpname);
return CL_EUNLINK;
}
}
free(tmpname);
return CL_EREAD;
}
size += bytes;
todo -= bytes;
if(cli_checklimits("cli_scanembpe", ctx, size, 0, 0)!=CL_CLEAN)
break;
if(cli_writen(fd, buff, bytes) != bytes) {
cli_dbgmsg("cli_scanembpe: Can't write to temporary file\n");
close(fd);
if(!ctx->engine->keeptmp) {
if (cli_unlink(tmpname)) {
free(tmpname);
return CL_EUNLINK;
}
}
free(tmpname);
return CL_EWRITE;
}
}
ctx->recursion++;
corrupted_input = ctx->corrupted_input;
ctx->corrupted_input = 1;
ret = cli_magic_scandesc(fd, ctx);
ctx->corrupted_input = corrupted_input;
if(ret == CL_VIRUS) {
cli_dbgmsg("cli_scanembpe: Infected with %s\n", cli_get_last_virus(ctx));
close(fd);
if(!ctx->engine->keeptmp) {
if (cli_unlink(tmpname)) {
free(tmpname);
return CL_EUNLINK;
}
}
free(tmpname);
return CL_VIRUS;
}
ctx->recursion--;
close(fd);
if(!ctx->engine->keeptmp) {
if (cli_unlink(tmpname)) {
free(tmpname);
return CL_EUNLINK;
}
}
free(tmpname);
/* intentionally ignore possible errors from cli_magic_scandesc */
return CL_CLEAN;
}
#if defined(_WIN32) || defined(C_LINUX)
#define PERF_MEASURE
#endif
#ifdef PERF_MEASURE
static struct {
enum perfev id;
const char *name;
enum ev_type type;
} perf_events[] = {
{PERFT_SCAN, "full scan", ev_time},
{PERFT_PRECB, "prescan cb", ev_time},
{PERFT_POSTCB, "postscan cb", ev_time},
{PERFT_CACHE, "cache", ev_time},
{PERFT_FT, "filetype", ev_time},
{PERFT_CONTAINER, "container", ev_time},
{PERFT_SCRIPT, "script", ev_time},
{PERFT_PE, "pe", ev_time},
{PERFT_RAW, "raw", ev_time},
{PERFT_RAWTYPENO, "raw container", ev_time},
{PERFT_MAP, "map", ev_time},
{PERFT_BYTECODE,"bytecode", ev_time},
{PERFT_KTIME,"kernel", ev_int},
{PERFT_UTIME,"user", ev_int}
};
static void get_thread_times(uint64_t *kt, uint64_t *ut)
{
#ifdef _WIN32
FILETIME c,e,k,u;
ULARGE_INTEGER kl,ul;
if (!GetThreadTimes(GetCurrentThread(), &c, &e, &k, &u)) {
*kt = *ut = 0;
return;
}
kl.LowPart = k.dwLowDateTime;
kl.HighPart = k.dwHighDateTime;
ul.LowPart = u.dwLowDateTime;
ul.HighPart = u.dwHighDateTime;
*kt = kl.QuadPart / 10;
*ut = ul.QuadPart / 10;
#else
struct tms tbuf;
if (times(&tbuf) != -1) {
clock_t tck = sysconf(_SC_CLK_TCK);
*kt = 1000000UL*tbuf.tms_stime / tck;
*ut = 1000000UL*tbuf.tms_utime / tck;
} else {
*kt = *ut = 0;
}
#endif
}
static inline void perf_init(cli_ctx *ctx)
{
uint64_t kt,ut;
unsigned i;
if (!(ctx->options & CL_SCAN_PERFORMANCE_INFO))
return;
ctx->perf = cli_events_new(PERFT_LAST);
for (i=0;i<sizeof(perf_events)/sizeof(perf_events[0]);i++) {
if (cli_event_define(ctx->perf, perf_events[i].id, perf_events[i].name,
perf_events[i].type, multiple_sum) == -1)
continue;
}
cli_event_time_start(ctx->perf, PERFT_SCAN);
get_thread_times(&kt, &ut);
cli_event_int(ctx->perf, PERFT_KTIME, -kt);
cli_event_int(ctx->perf, PERFT_UTIME, -ut);
}
static inline void perf_done(cli_ctx* ctx)
{
char timestr[512];
char *p;
unsigned i;
uint64_t kt,ut;
char *pend;
cli_events_t *perf = ctx->perf;
if (!perf)
return;
p = timestr;
pend = timestr + sizeof(timestr) - 1;
*pend = 0;
cli_event_time_stop(perf, PERFT_SCAN);
get_thread_times(&kt, &ut);
cli_event_int(perf, PERFT_KTIME, kt);
cli_event_int(perf, PERFT_UTIME, ut);
for (i=0;i<sizeof(perf_events)/sizeof(perf_events[0]);i++) {
union ev_val val;
unsigned count;
cli_event_get(perf, perf_events[i].id, &val, &count);
if (p < pend)
p += snprintf(p, pend - p, "%s: %d.%03ums, ", perf_events[i].name,
(signed)(val.v_int / 1000),
(unsigned)(val.v_int % 1000));
}
*p = 0;
cli_infomsg(ctx, "performance: %s\n", timestr);
cli_events_free(perf);
ctx->perf = NULL;
}
static inline void perf_start(cli_ctx* ctx, int id)
{
cli_event_time_start(ctx->perf, id);
}
static inline void perf_stop(cli_ctx* ctx, int id)
{
cli_event_time_stop(ctx->perf, id);
}
static inline void perf_nested_start(cli_ctx* ctx, int id, int nestedid)
{
cli_event_time_nested_start(ctx->perf, id, nestedid);
}
static inline void perf_nested_stop(cli_ctx* ctx, int id, int nestedid)
{
cli_event_time_nested_stop(ctx->perf, id, nestedid);
}
#else
static inline void perf_init(cli_ctx* ctx) {}
static inline void perf_start(cli_ctx* ctx, int id){}
static inline void perf_stop(cli_ctx* ctx, int id){}
static inline void perf_nested_start(cli_ctx* ctx, int id, int nestedid){}
static inline void perf_nested_stop(cli_ctx* ctx, int id, int nestedid){}
static inline void perf_done(cli_ctx* ctx){}
#endif
static int cli_scanraw(cli_ctx *ctx, cli_file_t type, uint8_t typercg, cli_file_t *dettype, unsigned char *refhash)
{
int ret = CL_CLEAN, nret = CL_CLEAN;
struct cli_matched_type *ftoffset = NULL, *fpt;
uint32_t lastrar;
struct cli_exe_info peinfo;
unsigned int acmode = AC_SCAN_VIR, break_loop = 0;
fmap_t *map = *ctx->fmap;
cli_file_t current_container_type = ctx->container_type;
size_t current_container_size = ctx->container_size;
if(ctx->engine->maxreclevel && ctx->recursion >= ctx->engine->maxreclevel)
return CL_EMAXREC;
perf_start(ctx, PERFT_RAW);
if(typercg)
acmode |= AC_SCAN_FT;
ret = cli_fmap_scandesc(ctx, type == CL_TYPE_TEXT_ASCII ? 0 : type, 0, &ftoffset, acmode, NULL, refhash);
perf_stop(ctx, PERFT_RAW);
if(ret >= CL_TYPENO) {
perf_nested_start(ctx, PERFT_RAWTYPENO, PERFT_SCAN);
ctx->recursion++;
if(nret != CL_VIRUS) { //TODO: don't need this test: nret == CL_CLEAN
lastrar = 0xdeadbeef;
fpt = ftoffset;
while(fpt) {
if(fpt->offset) switch(fpt->type) {
case CL_TYPE_RARSFX:
if(type != CL_TYPE_RAR && have_rar && SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_RAR)) {
ctx->container_type = CL_TYPE_RAR;
ctx->container_size = map->len - fpt->offset; /* not precise */
cli_dbgmsg("RAR/RAR-SFX signature found at %u\n", (unsigned int) fpt->offset);
nret = cli_scanrar(fmap_fd(map), ctx, fpt->offset, &lastrar);
}
break;
case CL_TYPE_ZIPSFX:
if(type != CL_TYPE_ZIP && SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_ZIP)) {
ctx->container_type = CL_TYPE_ZIP;
ctx->container_size = map->len - fpt->offset; /* not precise */
cli_dbgmsg("ZIP/ZIP-SFX signature found at %u\n", (unsigned int) fpt->offset);
nret = cli_unzip_single(ctx, fpt->offset);
}
break;
case CL_TYPE_CABSFX:
if(type != CL_TYPE_MSCAB && SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_CAB)) {
ctx->container_type = CL_TYPE_MSCAB;
ctx->container_size = map->len - fpt->offset; /* not precise */
cli_dbgmsg("CAB/CAB-SFX signature found at %u\n", (unsigned int) fpt->offset);
nret = cli_scanmscab(ctx, fpt->offset);
}
break;
case CL_TYPE_ARJSFX:
if(type != CL_TYPE_ARJ && SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_ARJ)) {
ctx->container_type = CL_TYPE_ARJ;
ctx->container_size = map->len - fpt->offset; /* not precise */
cli_dbgmsg("ARJ-SFX signature found at %u\n", (unsigned int) fpt->offset);
nret = cli_scanarj(ctx, fpt->offset, &lastrar);
}
break;
case CL_TYPE_7ZSFX:
if(type != CL_TYPE_7Z && SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_7Z)) {
ctx->container_type = CL_TYPE_7Z;
ctx->container_size = map->len - fpt->offset; /* not precise */
cli_dbgmsg("7Zip-SFX signature found at %u\n", (unsigned int) fpt->offset);
nret = cli_7unz(ctx, fpt->offset);
}
break;
case CL_TYPE_ISO9660:
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_ISO9660)) {
ctx->container_type = CL_TYPE_ISO9660;
ctx->container_size = map->len - fpt->offset; /* not precise */
cli_dbgmsg("ISO9660 signature found at %u\n", (unsigned int) fpt->offset);
nret = cli_scaniso(ctx, fpt->offset);
}
break;
case CL_TYPE_NULSFT:
if(SCAN_ARCHIVE && type == CL_TYPE_MSEXE && (DCONF_ARCH & ARCH_CONF_NSIS) && fpt->offset > 4) {
ctx->container_type = CL_TYPE_NULSFT;
ctx->container_size = map->len - fpt->offset; /* not precise */
cli_dbgmsg("NSIS signature found at %u\n", (unsigned int) fpt->offset-4);
nret = cli_scannulsft(ctx, fpt->offset - 4);
}
break;
case CL_TYPE_AUTOIT:
if(SCAN_ARCHIVE && type == CL_TYPE_MSEXE && (DCONF_ARCH & ARCH_CONF_AUTOIT)) {
ctx->container_type = CL_TYPE_AUTOIT;
ctx->container_size = map->len - fpt->offset; /* not precise */
cli_dbgmsg("AUTOIT signature found at %u\n", (unsigned int) fpt->offset);
nret = cli_scanautoit(ctx, fpt->offset + 23);
}
break;
case CL_TYPE_ISHIELD_MSI:
if(SCAN_ARCHIVE && type == CL_TYPE_MSEXE && (DCONF_ARCH & ARCH_CONF_ISHIELD)) {
ctx->container_type = CL_TYPE_AUTOIT;
ctx->container_size = map->len - fpt->offset; /* not precise */
cli_dbgmsg("ISHIELD-MSI signature found at %u\n", (unsigned int) fpt->offset);
nret = cli_scanishield_msi(ctx, fpt->offset + 14);
}
break;
case CL_TYPE_PDF:
if(type != CL_TYPE_PDF && SCAN_PDF && (DCONF_DOC & DOC_CONF_PDF)) {
ctx->container_type = CL_TYPE_PDF;
ctx->container_size = map->len - fpt->offset; /* not precise */
cli_dbgmsg("PDF signature found at %u\n", (unsigned int) fpt->offset);
nret = cli_scanpdf(ctx, fpt->offset);
}
break;
case CL_TYPE_MSEXE:
if(SCAN_PE && (type == CL_TYPE_MSEXE || type == CL_TYPE_ZIP || type == CL_TYPE_MSOLE2) && ctx->dconf->pe) {
if(map->len > 10485760)
break;
ctx->container_type = CL_TYPE_MSEXE; /* PE is a container for another executable here */
ctx->container_size = map->len - fpt->offset; /* not precise */
memset(&peinfo, 0, sizeof(struct cli_exe_info));
peinfo.offset = fpt->offset;
if(cli_peheader(map, &peinfo) == 0) {
cli_dbgmsg("*** Detected embedded PE file at %u ***\n", (unsigned int) fpt->offset);
if(peinfo.section)
free(peinfo.section);
cli_hashset_destroy(&peinfo.vinfo);
nret = cli_scanembpe(ctx, fpt->offset);
break_loop = 1; /* we can stop here and other
* embedded executables will
* be found recursively
* through the above call
*/
}
}
break;
default:
cli_warnmsg("cli_scanraw: Type %u not handled in fpt loop\n", fpt->type);
}
if(nret == CL_VIRUS || break_loop)
break;
fpt = fpt->next;
}
ctx->container_type = current_container_type;
ctx->container_size = current_container_size;
}
if(nret != CL_VIRUS) switch(ret) {
case CL_TYPE_HTML:
if(SCAN_HTML && type == CL_TYPE_TEXT_ASCII && (DCONF_DOC & DOC_CONF_HTML)) {
*dettype = CL_TYPE_HTML;
nret = cli_scanhtml(ctx);
}
break;
case CL_TYPE_MAIL:
ctx->container_type = CL_TYPE_MAIL;
ctx->container_size = map->len;
if(SCAN_MAIL && type == CL_TYPE_TEXT_ASCII && (DCONF_MAIL & MAIL_CONF_MBOX)) {
*dettype = CL_TYPE_MAIL;
nret = cli_scanmail(ctx);
}
ctx->container_type = current_container_type;
ctx->container_size = current_container_size;
break;
default:
break;
}
perf_nested_stop(ctx, PERFT_RAWTYPENO, PERFT_SCAN);
ctx->recursion--;
ret = nret;
}
while(ftoffset) {
fpt = ftoffset;
ftoffset = ftoffset->next;
free(fpt);
}
if(ret == CL_VIRUS)
cli_dbgmsg("%s found\n", cli_get_last_virus(ctx));
return ret;
}
static void emax_reached(cli_ctx *ctx) {
fmap_t **ctx_fmap = ctx->fmap;
if (!ctx_fmap)
return;
while(*ctx_fmap) {
fmap_t *map = *ctx_fmap;
map->dont_cache_flag = 1;
ctx_fmap--;
}
cli_dbgmsg("emax_reached: marked parents as non cacheable\n");
}
#define LINESTR(x) #x
#define LINESTR2(x) LINESTR(x)
#define __AT__ " at line "LINESTR2(__LINE__)
#define early_ret_from_magicscan(retcode) \
do { \
cli_dbgmsg("cli_magic_scandesc: returning %d %s (no post, no cache)\n", retcode, __AT__); \
return retcode; \
} while(0)
#define ret_from_magicscan(retcode) \
do { \
cli_dbgmsg("cli_magic_scandesc: returning %d %s\n", retcode, __AT__); \
if(ctx->engine->cb_post_scan) { \
perf_start(ctx, PERFT_POSTCB); \
switch(ctx->engine->cb_post_scan(fmap_fd(*ctx->fmap), retcode, ret == CL_VIRUS ? cli_get_last_virus(ctx) : NULL, ctx->cb_ctx)) { \
case CL_BREAK: \
cli_dbgmsg("cli_magic_scandesc: file whitelisted by post_scan callback\n"); \
perf_stop(ctx, PERFT_POSTCB); \
return CL_CLEAN; \
case CL_VIRUS: \
cli_dbgmsg("cli_magic_scandesc: file blacklisted by post_scan callback\n"); \
cli_append_virus(ctx, "Detected.By.Callback"); \
perf_stop(ctx, PERFT_POSTCB); \
if (retcode != CL_VIRUS) \
return cli_checkfp(hash, hashed_size, ctx); \
return CL_VIRUS; \
case CL_CLEAN: \
break; \
default: \
cli_warnmsg("cli_magic_scandesc: ignoring bad return code from post_scan callback\n"); \
} \
perf_stop(ctx, PERFT_POSTCB); \
} \
if (retcode == CL_CLEAN && cache_clean) { \
perf_start(ctx, PERFT_CACHE); \
cache_add(hash, hashed_size, ctx); \
perf_stop(ctx, PERFT_CACHE); \
} \
return retcode; \
} while(0)
#define CALL_PRESCAN_CB(scanfn) \
if(ctx->engine->scanfn) { \
perf_start(ctx, PERFT_PRECB); \
switch(ctx->engine->scanfn(fmap_fd(*ctx->fmap), filetype, ctx->cb_ctx)) { \
case CL_BREAK: \
cli_dbgmsg("cli_magic_scandesc: file whitelisted by "#scanfn" callback\n"); \
perf_stop(ctx, PERFT_PRECB); \
ret_from_magicscan(CL_CLEAN); \
case CL_VIRUS: \
cli_dbgmsg("cli_magic_scandesc: file blacklisted by "#scanfn" callback\n"); \
cli_append_virus(ctx, "Detected.By.Callback"); \
perf_stop(ctx, PERFT_PRECB); \
ret_from_magicscan(cli_checkfp(hash, hashed_size, ctx)); \
case CL_CLEAN: \
break; \
default: \
cli_warnmsg("cli_magic_scandesc: ignoring bad return code from callback\n"); \
} \
perf_stop(ctx, PERFT_PRECB); \
}
static int magic_scandesc(cli_ctx *ctx, cli_file_t type)
{
int ret = CL_CLEAN;
cli_file_t dettype = 0;
uint8_t typercg = 1;
cli_file_t current_container_type = ctx->container_type;
size_t current_container_size = ctx->container_size, hashed_size;
unsigned char hash[16];
bitset_t *old_hook_lsig_matches;
const char *filetype;
int cache_clean = 0, res;
unsigned int viruses_found = 0;
cli_dbgmsg("in magic_scandesc\n");
if(ctx->engine->maxreclevel && ctx->recursion > ctx->engine->maxreclevel) {
cli_dbgmsg("cli_magic_scandesc: Archive recursion limit exceeded (%u, max: %u)\n", ctx->recursion, ctx->engine->maxreclevel);
emax_reached(ctx);
early_ret_from_magicscan(CL_CLEAN);
}
if(!ctx->engine) {
cli_errmsg("CRITICAL: engine == NULL\n");
early_ret_from_magicscan(CL_ENULLARG);
}
if(!(ctx->engine->dboptions & CL_DB_COMPILED)) {
cli_errmsg("CRITICAL: engine not compiled\n");
early_ret_from_magicscan(CL_EMALFDB);
}
if(cli_updatelimits(ctx, (*ctx->fmap)->len)!=CL_CLEAN) {
emax_reached(ctx);
early_ret_from_magicscan(CL_CLEAN);
}
perf_start(ctx, PERFT_FT);
if(type == CL_TYPE_ANY)
type = cli_filetype2(*ctx->fmap, ctx->engine);
perf_stop(ctx, PERFT_FT);
if(type == CL_TYPE_ERROR) {
cli_dbgmsg("cli_magic_scandesc: cli_filetype2 returned CL_TYPE_ERROR\n");
early_ret_from_magicscan(CL_EREAD);
}
filetype = cli_ftname(type);
hashed_size = 0;
CALL_PRESCAN_CB(cb_pre_cache);
perf_start(ctx, PERFT_CACHE);
res = cache_check(hash, ctx);
if(res != CL_VIRUS) {
perf_stop(ctx, PERFT_CACHE);
early_ret_from_magicscan(res);
}
perf_stop(ctx, PERFT_CACHE);
hashed_size = (*ctx->fmap)->len;
old_hook_lsig_matches = ctx->hook_lsig_matches;
ctx->hook_lsig_matches = NULL;
if(!(ctx->options&~CL_SCAN_ALLMATCHES) || (ctx->recursion == ctx->engine->maxreclevel)) { /* raw mode (stdin, etc.) or last level of recursion */
if(ctx->recursion == ctx->engine->maxreclevel)
cli_dbgmsg("cli_magic_scandesc: Hit recursion limit, only scanning raw file\n");
else
cli_dbgmsg("Raw mode: No support for special files\n");
CALL_PRESCAN_CB(cb_pre_scan);
/* ret_from_magicscan can be used below here*/
if((ret = cli_fmap_scandesc(ctx, 0, 0, NULL, AC_SCAN_VIR, NULL, hash)) == CL_VIRUS)
cli_dbgmsg("%s found in descriptor %d\n", cli_get_last_virus(ctx), fmap_fd(*ctx->fmap));
else if(ret == CL_CLEAN) {
if(ctx->recursion != ctx->engine->maxreclevel)
cache_clean = 1; /* Only cache if limits are not reached */
else
emax_reached(ctx);
}
ctx->hook_lsig_matches = old_hook_lsig_matches;
ret_from_magicscan(ret);
}
CALL_PRESCAN_CB(cb_pre_scan);
/* ret_from_magicscan can be used below here*/
#ifdef HAVE__INTERNAL__SHA_COLLECT
if(!ctx->sha_collect && type==CL_TYPE_MSEXE) ctx->sha_collect = 1;
#endif
ctx->hook_lsig_matches = cli_bitset_init();
if (!ctx->hook_lsig_matches) {
ctx->hook_lsig_matches = old_hook_lsig_matches;
ret_from_magicscan(CL_EMEM);
}
if(type != CL_TYPE_IGNORED && ctx->engine->sdb) {
if((ret = cli_scanraw(ctx, type, 0, &dettype, hash)) == CL_VIRUS) {
ret = cli_checkfp(hash, hashed_size, ctx);
cli_bitset_free(ctx->hook_lsig_matches);
ctx->hook_lsig_matches = old_hook_lsig_matches;
ret_from_magicscan(ret);
}
}
ctx->recursion++;
perf_nested_start(ctx, PERFT_CONTAINER, PERFT_SCAN);
ctx->container_size = (*ctx->fmap)->len;
switch(type) {
case CL_TYPE_IGNORED:
break;
case CL_TYPE_RAR:
ctx->container_type = CL_TYPE_RAR;
if(have_rar && SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_RAR)) {
char *tmpname = NULL;
int desc = fmap_fd(*ctx->fmap);
if (desc == -1) {
size_t pos = 0, len;
cli_dbgmsg("fmap not backed by file, dumping ...\n");
if ((ret = cli_gentempfd(((cli_ctx*)ctx)->engine->tmpdir, &tmpname, &desc)) != CL_SUCCESS) {
cli_dbgmsg("fmap_fd: failed to generate temporary file.\n");
break;
}
do {
const char *b;
len = 0;
b = fmap_need_off_once_len(*ctx->fmap, pos, BUFSIZ, &len);
pos += len;
if (b && len > 0) {
if (cli_writen(desc, b, len) != len) {
close(desc);
unlink(tmpname);
cli_warnmsg("fmap_fd_dump: write failed\n");
ret = CL_EWRITE;
break;
}
}
} while (len > 0);
lseek(desc, 0, SEEK_SET);
}
ret = cli_scanrar(desc, ctx, 0, NULL);
if (tmpname) {
close(desc);
unlink(tmpname);
free(tmpname);
}
}
break;
case CL_TYPE_ZIP:
ctx->container_type = CL_TYPE_ZIP;
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_ZIP))
ret = cli_unzip(ctx);
break;
case CL_TYPE_GZ:
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_GZ))
ret = cli_scangzip(ctx);
break;
case CL_TYPE_BZ:
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_BZ))
ret = cli_scanbzip(ctx);
break;
case CL_TYPE_ARJ:
ctx->container_type = CL_TYPE_ARJ;
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_ARJ))
ret = cli_scanarj(ctx, 0, NULL);
break;
case CL_TYPE_NULSFT:
ctx->container_type = CL_TYPE_NULSFT;
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_NSIS))
ret = cli_scannulsft(ctx, 0);
break;
case CL_TYPE_AUTOIT:
ctx->container_type = CL_TYPE_AUTOIT;
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_AUTOIT))
ret = cli_scanautoit(ctx, 23);
break;
case CL_TYPE_MSSZDD:
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_SZDD))
ret = cli_scanszdd(ctx);
break;
case CL_TYPE_MSCAB:
ctx->container_type = CL_TYPE_MSCAB;
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_CAB))
ret = cli_scanmscab(ctx, 0);
break;
case CL_TYPE_HTML:
if(SCAN_HTML && (DCONF_DOC & DOC_CONF_HTML))
ret = cli_scanhtml(ctx);
break;
case CL_TYPE_HTML_UTF16:
if(SCAN_HTML && (DCONF_DOC & DOC_CONF_HTML))
ret = cli_scanhtml_utf16(ctx);
break;
case CL_TYPE_SCRIPT:
if((DCONF_DOC & DOC_CONF_SCRIPT) && dettype != CL_TYPE_HTML)
ret = cli_scanscript(ctx);
break;
case CL_TYPE_SWF:
/*
if(DCONF_DOC & DOC_CONF_SWF)
ret = cli_scanswf(ctx);
*/
break;
case CL_TYPE_RTF:
ctx->container_type = CL_TYPE_RTF;
if(SCAN_ARCHIVE && (DCONF_DOC & DOC_CONF_RTF))
ret = cli_scanrtf(ctx);
break;
case CL_TYPE_MAIL:
ctx->container_type = CL_TYPE_MAIL;
if(SCAN_MAIL && (DCONF_MAIL & MAIL_CONF_MBOX))
ret = cli_scanmail(ctx);
break;
case CL_TYPE_TNEF:
if(SCAN_MAIL && (DCONF_MAIL & MAIL_CONF_TNEF))
ret = cli_scantnef(ctx);
break;
case CL_TYPE_UUENCODED:
if(DCONF_OTHER & OTHER_CONF_UUENC)
ret = cli_scanuuencoded(ctx);
break;
case CL_TYPE_MSCHM:
ctx->container_type = CL_TYPE_MSCHM;
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_CHM))
ret = cli_scanmschm(ctx);
break;
case CL_TYPE_MSOLE2:
ctx->container_type = CL_TYPE_MSOLE2;
if(SCAN_OLE2 && (DCONF_ARCH & ARCH_CONF_OLE2))
ret = cli_scanole2(ctx);
break;
case CL_TYPE_7Z:
ctx->container_type = CL_TYPE_7Z;
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_7Z))
ret = cli_7unz(ctx, 0);
break;
case CL_TYPE_POSIX_TAR:
ctx->container_type = CL_TYPE_POSIX_TAR;
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_TAR))
ret = cli_scantar(ctx, 1);
break;
case CL_TYPE_OLD_TAR:
ctx->container_type = CL_TYPE_OLD_TAR;
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_TAR))
ret = cli_scantar(ctx, 0);
break;
case CL_TYPE_CPIO_OLD:
ctx->container_type = CL_TYPE_CPIO_OLD;
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_CPIO))
ret = cli_scancpio_old(ctx);
break;
case CL_TYPE_CPIO_ODC:
ctx->container_type = CL_TYPE_CPIO_ODC;
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_CPIO))
ret = cli_scancpio_odc(ctx);
break;
case CL_TYPE_CPIO_NEWC:
ctx->container_type = CL_TYPE_CPIO_NEWC;
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_CPIO))
ret = cli_scancpio_newc(ctx, 0);
break;
case CL_TYPE_CPIO_CRC:
ctx->container_type = CL_TYPE_CPIO_CRC;
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_CPIO))
ret = cli_scancpio_newc(ctx, 1);
break;
case CL_TYPE_BINHEX:
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_BINHEX))
ret = cli_binhex(ctx);
break;
case CL_TYPE_SCRENC:
if(DCONF_OTHER & OTHER_CONF_SCRENC)
ret = cli_scanscrenc(ctx);
break;
case CL_TYPE_RIFF:
if(SCAN_ALGO && (DCONF_OTHER & OTHER_CONF_RIFF))
ret = cli_scanriff(ctx);
break;
case CL_TYPE_GRAPHICS:
if(SCAN_ALGO && (DCONF_OTHER & OTHER_CONF_JPEG))
ret = cli_scanjpeg(ctx);
if(ctx->img_validate && SCAN_ALGO && ret != CL_VIRUS)
ret = cli_parsejpeg(ctx);
if(ctx->img_validate && SCAN_ALGO && ret != CL_VIRUS && ret != CL_EPARSE)
ret = cli_parsepng(ctx);
if(ctx->img_validate && SCAN_ALGO && ret != CL_VIRUS && ret != CL_EPARSE)
ret = cli_parsegif(ctx);
break;
case CL_TYPE_PDF: /* FIXMELIMITS: pdf should be an archive! */
ctx->container_type = CL_TYPE_PDF;
if(SCAN_PDF && (DCONF_DOC & DOC_CONF_PDF))
ret = cli_scanpdf(ctx, 0);
break;
case CL_TYPE_CRYPTFF:
if(DCONF_OTHER & OTHER_CONF_CRYPTFF)
ret = cli_scancryptff(ctx);
break;
case CL_TYPE_ELF:
if(SCAN_ELF && ctx->dconf->elf)
ret = cli_scanelf(ctx);
break;
case CL_TYPE_MACHO:
if(ctx->dconf->macho)
ret = cli_scanmacho(ctx, NULL);
break;
case CL_TYPE_MACHO_UNIBIN:
if(ctx->dconf->macho)
ret = cli_scanmacho_unibin(ctx);
break;
case CL_TYPE_SIS:
ctx->container_type = CL_TYPE_SIS;
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_SIS))
ret = cli_scansis(ctx);
break;
case CL_TYPE_BINARY_DATA:
case CL_TYPE_TEXT_UTF16BE:
if(SCAN_ALGO && (DCONF_OTHER & OTHER_CONF_MYDOOMLOG))
ret = cli_check_mydoom_log(ctx);
break;
case CL_TYPE_TEXT_ASCII:
if(SCAN_STRUCTURED && (DCONF_OTHER & OTHER_CONF_DLP))
/* TODO: consider calling this from cli_scanscript() for
* a normalised text
*/
ret = cli_scan_structured(ctx);
break;
default:
break;
}
perf_nested_stop(ctx, PERFT_CONTAINER, PERFT_SCAN);
ctx->recursion--;
ctx->container_type = current_container_type;
ctx->container_size = current_container_size;
if(ret == CL_VIRUS) {
ret = cli_checkfp(hash, hashed_size, ctx);
cli_bitset_free(ctx->hook_lsig_matches);
ctx->hook_lsig_matches = old_hook_lsig_matches;
ret_from_magicscan(ret);
}
if(type == CL_TYPE_ZIP && SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_ZIP)) {
if((*ctx->fmap)->len > 1048576) {
cli_dbgmsg("cli_magic_scandesc: Not checking for embedded PEs (zip file > 1 MB)\n");
typercg = 0;
}
}
/* CL_TYPE_HTML: raw HTML files are not scanned, unless safety measure activated via DCONF */
if(type != CL_TYPE_IGNORED && (type != CL_TYPE_HTML || !(DCONF_DOC & DOC_CONF_HTML_SKIPRAW)) && !ctx->engine->sdb) {
res = cli_scanraw(ctx, type, typercg, &dettype, hash);
if(res != CL_CLEAN) {
switch(res) {
/* List of scan halts, runtime errors only! */
case CL_EUNLINK:
case CL_ESTAT:
case CL_ESEEK:
case CL_EWRITE:
case CL_EDUP:
case CL_ETMPFILE:
case CL_ETMPDIR:
case CL_EMEM:
case CL_ETIMEOUT:
cli_dbgmsg("Descriptor[%d]: cli_scanraw error %s\n", fmap_fd(*ctx->fmap), cl_strerror(res));
cli_bitset_free(ctx->hook_lsig_matches);
ctx->hook_lsig_matches = old_hook_lsig_matches;
ret_from_magicscan(res);
/* CL_VIRUS = malware found, check FP and report */
case CL_VIRUS:
ret = cli_checkfp(hash, hashed_size, ctx);
if (SCAN_ALL)
break;
cli_bitset_free(ctx->hook_lsig_matches);
ctx->hook_lsig_matches = old_hook_lsig_matches;
ret_from_magicscan(ret);
/* "MAX" conditions should still fully scan the current file */
case CL_EMAXREC:
case CL_EMAXSIZE:
case CL_EMAXFILES:
ret = res;
cli_dbgmsg("Descriptor[%d]: Continuing after cli_scanraw reached %s\n",
fmap_fd(*ctx->fmap), cl_strerror(res));
break;
/* Other errors must not block further scans below
* This specifically includes CL_EFORMAT & CL_EREAD & CL_EUNPACK
* Malformed/truncated files could report as any of these three.
*/
default:
ret = res;
cli_dbgmsg("Descriptor[%d]: Continuing after cli_scanraw error %s\n",
fmap_fd(*ctx->fmap), cl_strerror(res));
}
}
}
ctx->recursion++;
switch(type) {
/* bytecode hooks triggered by a lsig must be a hook
* called from one of the functions here */
case CL_TYPE_TEXT_ASCII:
case CL_TYPE_TEXT_UTF16BE:
case CL_TYPE_TEXT_UTF16LE:
case CL_TYPE_TEXT_UTF8:
perf_nested_start(ctx, PERFT_SCRIPT, PERFT_SCAN);
if((DCONF_DOC & DOC_CONF_SCRIPT) && dettype != CL_TYPE_HTML && ret != CL_VIRUS)
ret = cli_scanscript(ctx);
if(SCAN_MAIL && (DCONF_MAIL & MAIL_CONF_MBOX) && ret != CL_VIRUS && (ctx->container_type == CL_TYPE_MAIL || dettype == CL_TYPE_MAIL)) {
ret = cli_fmap_scandesc(ctx, CL_TYPE_MAIL, 0, NULL, AC_SCAN_VIR, NULL, NULL);
}
perf_nested_stop(ctx, PERFT_SCRIPT, PERFT_SCAN);
break;
/* Due to performance reasons all executables were first scanned
* in raw mode. Now we will try to unpack them
*/
case CL_TYPE_MSEXE:
perf_nested_start(ctx, PERFT_PE, PERFT_SCAN);
if(SCAN_PE && ctx->dconf->pe) {
unsigned int corrupted_input = ctx->corrupted_input;
ret = cli_scanpe(ctx);
ctx->corrupted_input = corrupted_input;
}
perf_nested_stop(ctx, PERFT_PE, PERFT_SCAN);
break;
default:
break;
}
if(ret == CL_VIRUS)
ret = cli_checkfp(hash, hashed_size, ctx);
ctx->recursion--;
cli_bitset_free(ctx->hook_lsig_matches);
ctx->hook_lsig_matches = old_hook_lsig_matches;
switch(ret) {
/* Malformed file cases */
case CL_EFORMAT:
case CL_EREAD:
case CL_EUNPACK:
/* Limits exceeded */
case CL_EMAXREC:
case CL_EMAXSIZE:
case CL_EMAXFILES:
cli_dbgmsg("Descriptor[%d]: %s\n", fmap_fd(*ctx->fmap), cl_strerror(ret));
ret_from_magicscan(CL_CLEAN);
case CL_CLEAN:
cache_clean = 1;
ret_from_magicscan(CL_CLEAN);
default:
ret_from_magicscan(ret);
}
}
int cli_magic_scandesc(int desc, cli_ctx *ctx)
{
STATBUF sb;
int ret;
#ifdef HAVE__INTERNAL__SHA_COLLECT
if(ctx->sha_collect>0) ctx->sha_collect = 0;
#endif
cli_dbgmsg("in cli_magic_scandesc (reclevel: %u/%u)\n", ctx->recursion, ctx->engine->maxreclevel);
if(FSTAT(desc, &sb) == -1) {
cli_errmsg("magic_scandesc: Can't fstat descriptor %d\n", desc);
early_ret_from_magicscan(CL_ESTAT);
}
if(sb.st_size <= 5) {
cli_dbgmsg("Small data (%u bytes)\n", (unsigned int) sb.st_size);
early_ret_from_magicscan(CL_CLEAN);
}
ctx->fmap++;
perf_start(ctx, PERFT_MAP);
if(!(*ctx->fmap = fmap(desc, 0, sb.st_size))) {
cli_errmsg("CRITICAL: fmap() failed\n");
ctx->fmap--;
perf_stop(ctx, PERFT_MAP);
early_ret_from_magicscan(CL_EMEM);
}
perf_stop(ctx, PERFT_MAP);
ret = magic_scandesc(ctx, CL_TYPE_ANY);
funmap(*ctx->fmap);
ctx->fmap--;
return ret;
}
int cli_magic_scandesc_type(cli_ctx *ctx, cli_file_t type)
{
return magic_scandesc(ctx, type);
}
int cl_scandesc(int desc, const char **virname, unsigned long int *scanned, const struct cl_engine *engine, unsigned int scanoptions)
{
return cl_scandesc_callback(desc, virname, scanned, engine, scanoptions, NULL);
}
/* length = 0, till the end */
int cli_map_scandesc(cl_fmap_t *map, off_t offset, size_t length, cli_ctx *ctx)
{
off_t old_off = map->nested_offset;
size_t old_len = map->len;
size_t old_real_len = map->real_len;
int ret = CL_CLEAN;
cli_dbgmsg("cli_map_scandesc: [%ld, +%ld), [%ld, +%ld)\n",
old_off, old_len, offset, length);
if (offset < 0 || offset >= old_len) {
cli_dbgmsg("Invalid offset: %ld\n", (long)offset);
return CL_CLEAN;
}
if (!length) length = old_len - offset;
if (length > old_len - offset) {
cli_dbgmsg("Data truncated: %ld -> %ld\n",
length, old_len - offset);
length = old_len - offset;
}
if (length <= 5) {
cli_dbgmsg("Small data (%u bytes)\n", (unsigned int) length);
return CL_CLEAN;
}
ctx->fmap++;
*ctx->fmap = map;
/* can't change offset because then we'd have to discard/move cached
* data, instead use another offset to reuse the already cached data */
map->nested_offset += offset;
map->len = length;
map->real_len = map->nested_offset + length;
if (CLI_ISCONTAINED(old_off, old_len, map->nested_offset, map->len)) {
ret = magic_scandesc(ctx, CL_TYPE_ANY);
} else {
cli_warnmsg("internal map error: %ld, %ld; %ld, %ld\n", old_off, old_off + old_len,
map->offset,map->nested_offset+map->len);
}
ctx->fmap--;
map->nested_offset = old_off;
map->len = old_len;
map->real_len = old_real_len;
return ret;
}
int cli_mem_scandesc(const void *buffer, size_t length, cli_ctx *ctx)
{
int ret;
fmap_t *map = cl_fmap_open_memory(buffer, length);
if (!map) {
return CL_EMAP;
}
ret = cli_map_scandesc(map, 0, length, ctx);
cl_fmap_close(map);
return ret;
}
static int scan_common(int desc, cl_fmap_t *map, const char **virname, unsigned long int *scanned, const struct cl_engine *engine, unsigned int scanoptions, void *context)
{
cli_ctx ctx;
int rc;
memset(&ctx, '\0', sizeof(cli_ctx));
ctx.engine = engine;
ctx.virname = virname;
ctx.scanned = scanned;
ctx.options = scanoptions;
#if 0 /* for development testing only */
ctx.options |= CL_SCAN_ALLMATCHES;
#endif
ctx.found_possibly_unwanted = 0;
ctx.container_type = CL_TYPE_ANY;
ctx.container_size = 0;
ctx.dconf = (struct cli_dconf *) engine->dconf;
ctx.cb_ctx = context;
ctx.fmap = cli_calloc(sizeof(fmap_t *), ctx.engine->maxreclevel + 2);
if(!ctx.fmap)
return CL_EMEM;
if (!(ctx.hook_lsig_matches = cli_bitset_init())) {
free(ctx.fmap);
return CL_EMEM;
}
perf_init(&ctx);
#ifdef HAVE__INTERNAL__SHA_COLLECT
if(scanoptions & CL_SCAN_INTERNAL_COLLECT_SHA) {
char link[32];
ssize_t linksz;
snprintf(link, sizeof(link), "/proc/self/fd/%u", desc);
link[sizeof(link)-1]='\0';
if((linksz=readlink(link, ctx.entry_filename, sizeof(ctx.entry_filename)-1))==-1) {
cli_errmsg("failed to resolve filename for descriptor %d (%s)\n", desc, link);
strcpy(ctx.entry_filename, "NO_IDEA");
} else
ctx.entry_filename[linksz]='\0';
} while(0);
#endif
cli_logg_setup(&ctx);
rc = map ? cli_map_scandesc(map, 0, map->len, &ctx) : cli_magic_scandesc(desc, &ctx);
if (ctx.options & CL_SCAN_ALLMATCHES) {
*virname = (char *)ctx.virname; /* temp hack for scanall mode until api augmentation */
if (rc == CL_CLEAN && ctx.num_viruses)
rc = CL_VIRUS;
}
cli_bitset_free(ctx.hook_lsig_matches);
free(ctx.fmap);
if(rc == CL_CLEAN && ctx.found_possibly_unwanted)
rc = CL_VIRUS;
cli_logg_unsetup();
perf_done(&ctx);
return rc;
}
int cl_scandesc_callback(int desc, const char **virname, unsigned long int *scanned, const struct cl_engine *engine, unsigned int scanoptions, void *context)
{
return scan_common(desc, NULL, virname, scanned, engine, scanoptions, context);
}
int cl_scanmap_callback(cl_fmap_t *map, const char **virname, unsigned long int *scanned, const struct cl_engine *engine, unsigned int scanoptions, void *context)
{
return scan_common(-1, map, virname, scanned, engine, scanoptions, context);
}
int cli_found_possibly_unwanted(cli_ctx* ctx)
{
if(cli_get_last_virus(ctx)) {
cli_dbgmsg("found Possibly Unwanted: %s\n", cli_get_last_virus(ctx));
if(ctx->options & CL_SCAN_HEURISTIC_PRECEDENCE) {
/* we found a heuristic match, don't scan further,
* but consider it a virus. */
cli_dbgmsg("cli_found_possibly_unwanted: CL_VIRUS\n");
return CL_VIRUS;
}
/* heuristic scan isn't taking precedence, keep scanning.
* If this is part of an archive, and
* we find a real malware we report that instead of the
* heuristic match */
ctx->found_possibly_unwanted = 1;
} else {
cli_warnmsg("cli_found_possibly_unwanted called, but virname is not set\n");
}
emax_reached(ctx);
return CL_CLEAN;
}
static int cli_scanfile(const char *filename, cli_ctx *ctx)
{
int fd, ret;
/* internal version of cl_scanfile with arec/mrec preserved */
if((fd = safe_open(filename, O_RDONLY|O_BINARY)) == -1)
return CL_EOPEN;
ret = cli_magic_scandesc(fd, ctx);
close(fd);
return ret;
}
int cl_scanfile(const char *filename, const char **virname, unsigned long int *scanned, const struct cl_engine *engine, unsigned int scanoptions)
{
return cl_scanfile_callback(filename, virname, scanned, engine, scanoptions, NULL);
}
int cl_scanfile_callback(const char *filename, const char **virname, unsigned long int *scanned, const struct cl_engine *engine, unsigned int scanoptions, void *context)
{
int fd, ret;
const char *fname = cli_to_utf8_maybe_alloc(filename);
if(!fname)
return CL_EARG;
if((fd = safe_open(fname, O_RDONLY|O_BINARY)) == -1)
return CL_EOPEN;
if(fname != filename)
free((void*)fname);
ret = cl_scandesc_callback(fd, virname, scanned, engine, scanoptions, context);
close(fd);
return ret;
}
/*
Local Variables:
c-basic-offset: 4
End:
*/