/*
* Copyright (C) 2002 - 2005 Tomasz Kojm <tkojm@clamav.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/param.h>
#include <fcntl.h>
#include <dirent.h>
#include <netinet/in.h>
#if HAVE_MMAP
#if HAVE_SYS_MMAN_H
#include <sys/mman.h>
#else /* HAVE_SYS_MMAN_H */
#undef HAVE_MMAP
#endif
#endif
#include <mspack.h>
extern short cli_leavetemps_flag;
extern int cli_mbox(const char *dir, int desc, unsigned int options); /* FIXME */
#include "clamav.h"
#include "others.h"
#include "scanners.h"
#include "matcher-ac.h"
#include "matcher-bm.h"
#include "matcher.h"
#include "unrar.h"
#include "ole2_extract.h"
#include "vba_extract.h"
#include "msexpand.h"
#include "chmunpack.h"
#include "pe.h"
#include "filetypes.h"
#include "htmlnorm.h"
#include "untar.h"
#include "special.h"
#include "binhex.h"
#include "sis.h"
#include "pdf.h"
#ifdef HAVE_ZLIB_H
#include <zlib.h>
#include <zzip.h>
#endif
#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
/* Maximum filenames under various systems - njh */
#ifndef NAME_MAX /* e.g. Linux */
# ifdef MAXNAMELEN /* e.g. Solaris */
# define NAME_MAX MAXNAMELEN
# else
# ifdef FILENAME_MAX /* e.g. SCO */
# define NAME_MAX FILENAME_MAX
# else
# define NAME_MAX 256
# endif
# endif
#endif
#define MAX_MAIL_RECURSION 15
static int cli_scanfile(const char *filename, cli_ctx *ctx);
/*
#ifdef CL_THREAD_SAFE
static void cli_unlock_mutex(void *mtx)
{
cli_dbgmsg("Pthread cancelled. Unlocking mutex.\n");
pthread_mutex_unlock(mtx);
}
#endif
*/
static int cli_scanrar(int desc, cli_ctx *ctx, off_t sfx_offset, uint32_t *sfx_check)
{
int fd, ret = CL_CLEAN;
unsigned int files = 0;
rar_metadata_t *metadata, *metadata_tmp;
struct cli_meta_node *mdata;
char *dir;
cli_dbgmsg("in scanrar()\n");
/* generate the temporary directory */
dir = cli_gentemp(NULL);
if(mkdir(dir, 0700)) {
cli_dbgmsg("RAR: Can't create temporary directory %s\n", dir);
free(dir);
return CL_ETMPDIR;
}
if(sfx_offset)
lseek(desc, sfx_offset, SEEK_SET);
metadata = metadata_tmp = cli_unrar(desc, dir, ctx->limits);
if(cli_scandir(dir, ctx) == CL_VIRUS) {
ret = CL_VIRUS;
} else while(metadata) {
files++;
if(files == 1 && sfx_check) {
if(*sfx_check == metadata->crc)
break;
else
*sfx_check = metadata->crc;
}
cli_dbgmsg("RAR: %s, crc32: 0x%x, encrypted: %d, compressed: %u, normal: %u, method: %d, ratio: %d (max: %d)\n",
metadata->filename, metadata->crc, metadata->encrypted, metadata->pack_size,
metadata->unpack_size, metadata->method,
metadata->pack_size ? ((unsigned int) metadata->unpack_size / (unsigned int) metadata->pack_size) : 0, ctx->limits ? ctx->limits->maxratio : 0);
/* Scan metadata */
mdata = ctx->engine->rar_mlist;
if(mdata) do {
if(mdata->encrypted != metadata->encrypted)
continue;
if(mdata->crc32 && (unsigned int) mdata->crc32 != metadata->crc)
continue;
if(mdata->csize > 0 && (unsigned int) mdata->csize != metadata->pack_size)
continue;
if(mdata->size >= 0 && (unsigned int) mdata->size != metadata->unpack_size)
continue;
if(mdata->method >= 0 && mdata->method != metadata->method)
continue;
if(mdata->fileno && mdata->fileno != files)
continue;
if(mdata->maxdepth && ctx->arec > mdata->maxdepth)
continue;
/* TODO add support for regex */
/*if(mdata->filename && !strstr(zdirent.d_name, mdata->filename))*/
if(mdata->filename && strcmp((char *) metadata->filename, mdata->filename))
continue;
break; /* matched */
} while((mdata = mdata->next));
if(mdata) {
*ctx->virname = mdata->virname;
ret = CL_VIRUS;
break;
}
if(DETECT_ENCRYPTED && metadata->encrypted) {
cli_dbgmsg("RAR: Encrypted files found in archive.\n");
lseek(desc, 0, SEEK_SET);
ret = cli_scandesc(desc, ctx, 0, 0, NULL);
if(ret < 0) {
break;
} else if(ret != CL_VIRUS) {
*ctx->virname = "Encrypted.RAR";
ret = CL_VIRUS;
}
break;
}
/*
TROG - TODO: multi-volume files
if((rarlist->item.Flags & 0x03) != 0) {
cli_dbgmsg("RAR: Skipping %s (split)\n", rarlist->item.Name);
rarlist = rarlist->next;
continue;
}
*/
if(ctx->limits) {
if(ctx->limits->maxratio && metadata->unpack_size && metadata->pack_size) {
if((unsigned int) metadata->unpack_size / (unsigned int) metadata->pack_size >= ctx->limits->maxratio) {
cli_dbgmsg("RAR: Max ratio reached (normal: %u, compressed: %u, max: %ld)\n", metadata->unpack_size,
metadata->pack_size, ctx->limits->maxratio);
*ctx->virname = "Oversized.RAR";
ret = CL_VIRUS;
break;
}
}
if(ctx->limits->maxfilesize && (metadata->unpack_size > (unsigned int) ctx->limits->maxfilesize)) {
cli_dbgmsg("RAR: %s: Size exceeded (%u, max: %lu)\n", metadata->filename,
metadata->unpack_size, ctx->limits->maxfilesize);
if(BLOCKMAX) {
*ctx->virname = "RAR.ExceededFileSize";
ret = CL_VIRUS;
break;
}
metadata = metadata->next;
continue;
}
if(ctx->limits->maxfiles && (files > ctx->limits->maxfiles)) {
cli_dbgmsg("RAR: Files limit reached (max: %d)\n", ctx->limits->maxfiles);
if(BLOCKMAX) {
*ctx->virname = "RAR.ExceededFilesLimit";
ret = CL_VIRUS;
break;
}
break;
}
}
metadata = metadata->next;
}
if(!cli_leavetemps_flag)
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);
return ret;
}
#ifdef HAVE_ZLIB_H
static int cli_scanzip(int desc, cli_ctx *ctx, off_t sfx_offset, uint32_t *sfx_check)
{
ZZIP_DIR *zdir;
ZZIP_DIRENT zdirent;
ZZIP_FILE *zfp;
FILE *tmp = NULL;
char *tmpname;
char *buff;
int fd, bytes, ret = CL_CLEAN;
unsigned long int size = 0;
unsigned int files = 0, encrypted;
struct stat source;
struct cli_meta_node *mdata;
zzip_error_t err;
cli_dbgmsg("in scanzip()\n");
if(sfx_offset)
lseek(desc, sfx_offset, SEEK_SET);
if((zdir = zzip_dir_fdopen(dup(desc), &err)) == NULL) {
cli_dbgmsg("Zip: zzip_dir_fdopen() return code: %d\n", err);
/* no return with CL_EZIP due to password protected zips */
return CL_CLEAN;
}
fstat(desc, &source);
if(!(buff = (char *) cli_malloc(FILEBUFF))) {
cli_dbgmsg("Zip: unable to malloc(%d)\n", FILEBUFF);
zzip_dir_close(zdir);
return CL_EMEM;
}
while(zzip_dir_read(zdir, &zdirent)) {
files++;
if(files == 1 && sfx_check) {
if(*sfx_check == zdirent.d_crc32)
break;
else
*sfx_check = zdirent.d_crc32;
}
if(!zdirent.d_name || !strlen(zdirent.d_name)) { /* Mimail fix */
cli_dbgmsg("Zip: strlen(zdirent.d_name) == %d\n", strlen(zdirent.d_name));
*ctx->virname = "Suspect.Zip";
ret = CL_VIRUS;
break;
}
/* Bit 0: file is encrypted
* Bit 6: Strong encryption was used
* Bit 13: Encrypted central directory
*/
encrypted = (zdirent.d_flags & 0x2041 != 0);
cli_dbgmsg("Zip: %s, crc32: 0x%x, offset: %d, encrypted: %d, compressed: %u, normal: %u, method: %d, ratio: %d (max: %d)\n", zdirent.d_name, zdirent.d_crc32, zdirent.d_off, encrypted, zdirent.d_csize, zdirent.st_size, zdirent.d_compr, zdirent.d_csize ? (zdirent.st_size / zdirent.d_csize) : 0, ctx->limits ? ctx->limits->maxratio : 0);
if(!zdirent.st_size) {
if(zdirent.d_crc32) {
cli_dbgmsg("Zip: Broken file or modified information in local header part of archive\n");
*ctx->virname = "Exploit.Zip.ModifiedHeaders";
ret = CL_VIRUS;
break;
}
continue;
}
/* Scan metadata */
mdata = ctx->engine->zip_mlist;
if(mdata) do {
if(mdata->encrypted != encrypted)
continue;
if(mdata->crc32 && mdata->crc32 != (unsigned int) zdirent.d_crc32)
continue;
if(mdata->csize > 0 && mdata->csize != zdirent.d_csize)
continue;
if(mdata->size >= 0 && mdata->size != zdirent.st_size)
continue;
if(mdata->method >= 0 && mdata->method != (unsigned int) zdirent.d_compr)
continue;
if(mdata->fileno && mdata->fileno != files)
continue;
if(mdata->maxdepth && ctx->arec > mdata->maxdepth)
continue;
/* TODO add support for regex */
/*if(mdata->filename && !strstr(zdirent.d_name, mdata->filename))*/
if(mdata->filename && strcmp(zdirent.d_name, mdata->filename))
continue;
break; /* matched */
} while((mdata = mdata->next));
if(mdata) {
*ctx->virname = mdata->virname;
ret = CL_VIRUS;
break;
}
/*
* Workaround for archives created with ICEOWS.
* ZZIP_DIRENT does not contain information on file type
* so we try to determine a directory via a filename
*/
if(zdirent.d_name[strlen(zdirent.d_name) - 1] == '/') {
cli_dbgmsg("Zip: Directory entry with st_size != 0\n");
continue;
}
/* work-around for problematic zips (zziplib crashes with them) */
if(zdirent.d_csize <= 0 || zdirent.st_size < 0) {
cli_dbgmsg("Zip: Malformed archive detected.\n");
*ctx->virname = "Suspect.Zip";
ret = CL_VIRUS;
break;
}
if(ctx->limits && ctx->limits->maxratio > 0 && ((unsigned) zdirent.st_size / (unsigned) zdirent.d_csize) >= ctx->limits->maxratio) {
*ctx->virname = "Oversized.Zip";
ret = CL_VIRUS;
break;
}
if(DETECT_ENCRYPTED && encrypted) {
cli_dbgmsg("Zip: Encrypted files found in archive.\n");
lseek(desc, 0, SEEK_SET);
ret = cli_scandesc(desc, ctx, 0, 0, NULL);
if(ret < 0) {
break;
} else if(ret != CL_VIRUS) {
*ctx->virname = "Encrypted.Zip";
ret = CL_VIRUS;
}
break;
}
if(ctx->limits) {
if(ctx->limits->maxfilesize && ((unsigned int) zdirent.st_size > ctx->limits->maxfilesize)) {
cli_dbgmsg("Zip: %s: Size exceeded (%d, max: %ld)\n", zdirent.d_name, zdirent.st_size, ctx->limits->maxfilesize);
/* ret = CL_EMAXSIZE; */
if(BLOCKMAX) {
*ctx->virname = "Zip.ExceededFileSize";
ret = CL_VIRUS;
break;
}
continue; /* continue scanning */
}
if(ctx->limits->maxfiles && (files > ctx->limits->maxfiles)) {
cli_dbgmsg("Zip: Files limit reached (max: %d)\n", ctx->limits->maxfiles);
if(BLOCKMAX) {
*ctx->virname = "Zip.ExceededFilesLimit";
ret = CL_VIRUS;
break;
}
break;
}
}
if((zfp = zzip_file_open(zdir, zdirent.d_name, 0, zdirent.d_off)) == NULL) {
cli_dbgmsg("Zip: Can't open file %s\n", zdirent.d_name);
ret = CL_EZIP;
break;
}
/* generate temporary file and get its descriptor */
if((tmpname = cli_gentempstream(NULL, &tmp)) == NULL) {
cli_dbgmsg("Zip: Can't generate tmpfile().\n");
zzip_file_close(zfp);
ret = CL_ETMPFILE;
break;
}
size = 0;
while((bytes = zzip_file_read(zfp, buff, FILEBUFF)) > 0) {
size += bytes;
if(fwrite(buff, 1, bytes, tmp) != (size_t) bytes) {
cli_dbgmsg("Zip: Can't write to file.\n");
zzip_file_close(zfp);
zzip_dir_close(zdir);
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
free(buff);
return CL_EIO;
}
}
zzip_file_close(zfp);
if(!encrypted && size != zdirent.st_size) {
cli_dbgmsg("Zip: Incorrectly decompressed (%d != %d)\n", size, zdirent.st_size);
ret = CL_EZIP;
break;
}
if(fflush(tmp) != 0) {
cli_dbgmsg("Zip: fflush() failed: %s\n", strerror(errno));
ret = CL_EFSYNC;
break;
}
fd = fileno(tmp);
lseek(fd, 0, SEEK_SET);
if((ret = cli_magic_scandesc(fd, ctx)) == CL_VIRUS ) {
cli_dbgmsg("Zip: Infected with %s\n", *ctx->virname);
ret = CL_VIRUS;
break;
} else if(ret == CL_EMALFZIP) {
cli_dbgmsg("Zip: Malformed Zip file, scanning stopped.\n");
*ctx->virname = "Suspect.Zip";
ret = CL_VIRUS;
break;
}
if (tmp) {
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
tmp = NULL;
}
}
zzip_dir_close(zdir);
if (tmp) {
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
tmp = NULL;
}
free(buff);
return ret;
}
static int cli_scangzip(int desc, cli_ctx *ctx)
{
int fd, bytes, ret = CL_CLEAN;
unsigned long int size = 0;
char *buff;
FILE *tmp = NULL;
char *tmpname;
gzFile gd;
cli_dbgmsg("in cli_scangzip()\n");
if((gd = gzdopen(dup(desc), "rb")) == NULL) {
cli_dbgmsg("GZip: Can't open descriptor %d\n", desc);
return CL_EGZIP;
}
if((tmpname = cli_gentempstream(NULL, &tmp)) == NULL) {
cli_dbgmsg("GZip: Can't generate temporary file.\n");
gzclose(gd);
return CL_ETMPFILE;
}
fd = fileno(tmp);
if(!(buff = (char *) cli_malloc(FILEBUFF))) {
cli_dbgmsg("GZip: Unable to malloc %d bytes.\n", FILEBUFF);
gzclose(gd);
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
return CL_EMEM;
}
while((bytes = gzread(gd, buff, FILEBUFF)) > 0) {
size += bytes;
if(ctx->limits)
if(ctx->limits->maxfilesize && (size + FILEBUFF > ctx->limits->maxfilesize)) {
cli_dbgmsg("GZip: Size exceeded (stopped at %ld, max: %ld)\n", size, ctx->limits->maxfilesize);
if(BLOCKMAX) {
*ctx->virname = "GZip.ExceededFileSize";
ret = CL_VIRUS;
}
break;
}
if(cli_writen(fd, buff, bytes) != bytes) {
cli_dbgmsg("GZip: Can't write to file.\n");
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
gzclose(gd);
free(buff);
return CL_EGZIP;
}
}
free(buff);
gzclose(gd);
if(ret == CL_VIRUS) {
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
return ret;
}
if(fsync(fd) == -1) {
cli_dbgmsg("GZip: Can't synchronise descriptor %d\n", fd);
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
return CL_EFSYNC;
}
lseek(fd, 0, SEEK_SET);
if((ret = cli_magic_scandesc(fd, ctx)) == CL_VIRUS ) {
cli_dbgmsg("GZip: Infected with %s\n", *ctx->virname);
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
return CL_VIRUS;
}
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
return ret;
}
#endif
#ifdef HAVE_BZLIB_H
#ifdef NOBZ2PREFIX
#define BZ2_bzReadOpen bzReadOpen
#define BZ2_bzReadClose bzReadClose
#define BZ2_bzRead bzRead
#endif
static int cli_scanbzip(int desc, cli_ctx *ctx)
{
int fd, bytes, ret = CL_CLEAN, bzerror = 0;
short memlim = 0;
unsigned long int size = 0;
char *buff;
FILE *fs, *tmp = NULL;
char *tmpname;
BZFILE *bfd;
if((fs = fdopen(dup(desc), "rb")) == NULL) {
cli_dbgmsg("Bzip: Can't open descriptor %d.\n", desc);
return CL_EBZIP;
}
if(ctx->limits)
if(ctx->limits->archivememlim)
memlim = 1;
if((bfd = BZ2_bzReadOpen(&bzerror, fs, 0, memlim, NULL, 0)) == NULL) {
cli_dbgmsg("Bzip: Can't initialize bzip2 library (descriptor: %d).\n", desc);
fclose(fs);
return CL_EBZIP;
}
if((tmpname = cli_gentempstream(NULL, &tmp)) == NULL) {
cli_dbgmsg("Bzip: Can't generate temporary file.\n");
BZ2_bzReadClose(&bzerror, bfd);
fclose(fs);
return CL_ETMPFILE;
}
fd = fileno(tmp);
if(!(buff = (char *) malloc(FILEBUFF))) {
cli_dbgmsg("Bzip: Unable to malloc %d bytes.\n", FILEBUFF);
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
fclose(fs);
BZ2_bzReadClose(&bzerror, bfd);
return CL_EMEM;
}
while((bytes = BZ2_bzRead(&bzerror, bfd, buff, FILEBUFF)) > 0) {
size += bytes;
if(ctx->limits)
if(ctx->limits->maxfilesize && (size + FILEBUFF > ctx->limits->maxfilesize)) {
cli_dbgmsg("Bzip: Size exceeded (stopped at %ld, max: %ld)\n", size, ctx->limits->maxfilesize);
if(BLOCKMAX) {
*ctx->virname = "BZip.ExceededFileSize";
ret = CL_VIRUS;
}
break;
}
if(cli_writen(fd, buff, bytes) != bytes) {
cli_dbgmsg("Bzip: Can't write to file.\n");
BZ2_bzReadClose(&bzerror, bfd);
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
free(buff);
fclose(fs);
return CL_EGZIP;
}
}
free(buff);
BZ2_bzReadClose(&bzerror, bfd);
if(ret == CL_VIRUS) {
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
fclose(fs);
return ret;
}
if(fsync(fd) == -1) {
cli_dbgmsg("Bzip: Synchronisation failed for descriptor %d\n", fd);
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
fclose(fs);
return CL_EFSYNC;
}
lseek(fd, 0, SEEK_SET);
if((ret = cli_magic_scandesc(fd, ctx)) == CL_VIRUS ) {
cli_dbgmsg("Bzip: Infected with %s\n", *ctx->virname);
}
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
fclose(fs);
return ret;
}
#endif
static int cli_scanszdd(int desc, cli_ctx *ctx)
{
int fd, ret = CL_CLEAN, dcpy;
FILE *tmp = NULL, *in;
char *tmpname;
cli_dbgmsg("in cli_scanszdd()\n");
if((dcpy = dup(desc)) == -1) {
cli_dbgmsg("SZDD: Can't duplicate descriptor %d\n", desc);
return CL_EIO;
}
if((in = fdopen(dcpy, "rb")) == NULL) {
cli_dbgmsg("SZDD: Can't open descriptor %d\n", desc);
close(dcpy);
return CL_EMSCOMP;
}
if((tmpname = cli_gentempstream(NULL, &tmp)) == NULL) {
cli_dbgmsg("SZDD: Can't generate temporary file.\n");
fclose(in);
return CL_ETMPFILE;
}
if(cli_msexpand(in, tmp) == -1) {
cli_dbgmsg("SZDD: msexpand failed.\n");
fclose(in);
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
return CL_EMSCOMP;
}
fclose(in);
if(fflush(tmp)) {
cli_dbgmsg("SZDD: fflush() failed.\n");
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
return CL_EFSYNC;
}
fd = fileno(tmp);
lseek(fd, 0, SEEK_SET);
if((ret = cli_magic_scandesc(fd, ctx)) == CL_VIRUS) {
cli_dbgmsg("SZDD: Infected with %s\n", *ctx->virname);
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
return CL_VIRUS;
}
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
return ret;
}
static int cli_scanmscab(int desc, cli_ctx *ctx)
{
struct mscab_decompressor *cabd = NULL;
struct mscabd_cabinet *base, *cab;
struct mscabd_file *file;
char *tempname;
int ret = CL_CLEAN;
cli_dbgmsg("in cli_scanmscab()\n");
if((cabd = mspack_create_cab_decompressor(NULL)) == NULL) {
cli_dbgmsg("MSCAB: Can't create libmspack CAB decompressor\n");
return CL_EMSCAB;
}
if((base = cabd->dsearch(cabd, dup(desc))) == NULL) {
cli_dbgmsg("MSCAB: I/O error or no valid cabinets found\n");
mspack_destroy_cab_decompressor(cabd);
return CL_EMSCAB;
}
for(cab = base; cab; cab = cab->next) {
for(file = cab->files; file; file = file->next) {
if(ctx->limits && ctx->limits->maxfilesize && (file->length > (unsigned int) ctx->limits->maxfilesize)) {
cli_dbgmsg("MSCAB: %s: Size exceeded (%u, max: %lu)\n", file->filename, file->length, ctx->limits->maxfilesize);
if(BLOCKMAX) {
*ctx->virname = "MSCAB.ExceededFileSize";
cabd->close(cabd, base);
mspack_destroy_cab_decompressor(cabd);
return CL_VIRUS;
}
continue;
}
tempname = cli_gentemp(NULL);
cli_dbgmsg("MSCAB: Extracting data to %s\n", tempname);
if(cabd->extract(cabd, file, tempname)) {
cli_dbgmsg("MSCAB: libmscab error code: %d\n", cabd->last_error(cabd));
} else {
ret = cli_scanfile(tempname, ctx);
}
if(!cli_leavetemps_flag)
unlink(tempname);
free(tempname);
if(ret == CL_VIRUS)
break;
}
if(ret == CL_VIRUS)
break;
}
cabd->close(cabd, base);
mspack_destroy_cab_decompressor(cabd);
return ret;
}
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
struct stat statbuf;
char *fname;
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
#ifndef C_INTERIX
if(dent->d_ino)
#endif
{
if(strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..")) {
/* build the full name */
fname = cli_calloc(strlen(dirname) + strlen(dent->d_name) + 2, sizeof(char));
sprintf(fname, "%s/%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);
closedir(dd);
return CL_VIRUS;
}
} else
if(S_ISREG(statbuf.st_mode))
if(cli_scanfile(fname, ctx) == CL_VIRUS) {
free(fname);
closedir(dd);
return CL_VIRUS;
}
}
free(fname);
}
}
}
} else {
cli_dbgmsg("ScanDir: Can't open directory %s.\n", dirname);
return CL_EOPEN;
}
closedir(dd);
return 0;
}
static int cli_vba_scandir(const char *dirname, cli_ctx *ctx)
{
int ret = CL_CLEAN, i, fd, ofd, data_len;
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
struct stat statbuf;
char *fname, *fullname;
unsigned char *data;
cli_dbgmsg("VBADir: %s\n", dirname);
if((vba_project = (vba_project_t *) vba56_dir_read(dirname))) {
for(i = 0; i < vba_project->count; i++) {
fullname = (char *) cli_malloc(strlen(vba_project->dir) + strlen(vba_project->name[i]) + 2);
sprintf(fullname, "%s/%s", vba_project->dir, vba_project->name[i]);
fd = open(fullname, O_RDONLY);
if(fd == -1) {
cli_dbgmsg("VBADir: Can't open file %s\n", fullname);
free(fullname);
ret = CL_EOPEN;
break;
}
free(fullname);
cli_dbgmsg("VBADir: Decompress VBA project '%s'\n", vba_project->name[i]);
data = (unsigned char *) vba_decompress(fd, vba_project->offset[i], &data_len);
close(fd);
if(!data) {
cli_dbgmsg("VBADir: WARNING: VBA project '%s' decompressed to NULL\n", vba_project->name[i]);
} else {
if(ctx->scanned)
*ctx->scanned += data_len / CL_COUNT_PRECISION;
if(cli_scanbuff((char *) data, data_len, ctx->virname, ctx->engine, CL_TYPE_MSOLE2) == CL_VIRUS) {
free(data);
ret = CL_VIRUS;
break;
}
free(data);
}
}
for(i = 0; i < vba_project->count; i++)
free(vba_project->name[i]);
free(vba_project->name);
free(vba_project->dir);
free(vba_project->offset);
free(vba_project);
} else if ((fullname = ppt_vba_read(dirname))) {
if(cli_scandir(fullname, ctx) == CL_VIRUS) {
ret = CL_VIRUS;
}
if(!cli_leavetemps_flag)
cli_rmdirs(fullname);
free(fullname);
} else if ((vba_project = (vba_project_t *) wm_dir_read(dirname))) {
for (i = 0; i < vba_project->count; i++) {
fullname = (char *) cli_malloc(strlen(vba_project->dir) + strlen(vba_project->name[i]) + 2);
sprintf(fullname, "%s/%s", vba_project->dir, vba_project->name[i]);
fd = open(fullname, O_RDONLY);
if(fd == -1) {
cli_dbgmsg("VBADir: Can't open file %s\n", fullname);
free(fullname);
ret = CL_EOPEN;
break;
}
free(fullname);
cli_dbgmsg("VBADir: Decompress WM project '%s' macro:%d key:%d\n", vba_project->name[i], i, vba_project->key[i]);
data = (unsigned char *) wm_decrypt_macro(fd, vba_project->offset[i], vba_project->length[i], vba_project->key[i]);
close(fd);
if(!data) {
cli_dbgmsg("VBADir: WARNING: WM project '%s' macro %d decrypted to NULL\n", vba_project->name[i], i);
} else {
if(ctx->scanned)
*ctx->scanned += vba_project->length[i] / CL_COUNT_PRECISION;
if(cli_scanbuff((char *) data, vba_project->length[i], ctx->virname, ctx->engine, CL_TYPE_MSOLE2) == CL_VIRUS) {
free(data);
ret = CL_VIRUS;
break;
}
free(data);
}
}
for(i = 0; i < vba_project->count; i++)
free(vba_project->name[i]);
free(vba_project->key);
free(vba_project->length);
free(vba_project->offset);
free(vba_project->name);
free(vba_project->dir);
free(vba_project);
}
if(ret != CL_CLEAN)
return ret;
/* Check directory for embedded OLE objects */
fullname = (char *) cli_malloc(strlen(dirname) + 16);
sprintf(fullname, "%s/_1_Ole10Native", dirname);
fd = open(fullname, O_RDONLY);
free(fullname);
if (fd >= 0) {
ofd = cli_decode_ole_object(fd, dirname);
if (ofd >= 0) {
ret = cli_scandesc(ofd, ctx, 0, 0, NULL);
close(ofd);
}
close(fd);
if(ret != CL_CLEAN)
return ret;
}
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
#ifndef C_INTERIX
if(dent->d_ino)
#endif
{
if(strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..")) {
/* build the full name */
fname = cli_calloc(strlen(dirname) + strlen(dent->d_name) + 2, sizeof(char));
sprintf(fname, "%s/%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_vba_scandir(fname, ctx) == CL_VIRUS) {
ret = CL_VIRUS;
free(fname);
break;
}
}
free(fname);
}
}
}
} else {
cli_dbgmsg("VBADir: Can't open directory %s.\n", dirname);
return CL_EOPEN;
}
closedir(dd);
return ret;
}
static int cli_scanhtml(int desc, cli_ctx *ctx)
{
char *tempname, fullname[1024];
int ret=CL_CLEAN, fd;
cli_dbgmsg("in cli_scanhtml()\n");
tempname = cli_gentemp(NULL);
if(mkdir(tempname, 0700)) {
cli_dbgmsg("ScanHTML -> Can't create temporary directory %s\n", tempname);
free(tempname);
return CL_ETMPDIR;
}
html_normalise_fd(desc, tempname, NULL);
snprintf(fullname, 1024, "%s/comment.html", tempname);
fd = open(fullname, O_RDONLY);
if (fd >= 0) {
ret = cli_scandesc(fd, ctx, 0, CL_TYPE_HTML, NULL);
close(fd);
}
if(ret < 0 || ret == CL_VIRUS) {
if(!cli_leavetemps_flag)
cli_rmdirs(tempname);
free(tempname);
return ret;
}
if (ret == CL_CLEAN) {
snprintf(fullname, 1024, "%s/nocomment.html", tempname);
fd = open(fullname, O_RDONLY);
if (fd >= 0) {
ret = cli_scandesc(fd, ctx, 0, CL_TYPE_HTML, NULL);
close(fd);
}
}
if(ret < 0 || ret == CL_VIRUS) {
if(!cli_leavetemps_flag)
cli_rmdirs(tempname);
free(tempname);
return ret;
}
if (ret == CL_CLEAN) {
snprintf(fullname, 1024, "%s/script.html", tempname);
fd = open(fullname, O_RDONLY);
if (fd >= 0) {
ret = cli_scandesc(fd, ctx, 0, CL_TYPE_HTML, NULL);
close(fd);
}
}
if(ret < 0 || ret == CL_VIRUS) {
if(!cli_leavetemps_flag)
cli_rmdirs(tempname);
free(tempname);
return ret;
}
if (ret == CL_CLEAN) {
snprintf(fullname, 1024, "%s/rfc2397", tempname);
ret = cli_scandir(fullname, ctx);
}
if(!cli_leavetemps_flag)
cli_rmdirs(tempname);
free(tempname);
return ret;
}
static int cli_scanole2(int desc, cli_ctx *ctx)
{
char *dir;
int ret = CL_CLEAN;
cli_dbgmsg("in cli_scanole2()\n");
/* generate the temporary directory */
dir = cli_gentemp(NULL);
if(mkdir(dir, 0700)) {
cli_dbgmsg("OLE2: Can't create temporary directory %s\n", dir);
free(dir);
return CL_ETMPDIR;
}
if((ret = cli_ole2_extract(desc, dir, ctx->limits))) {
cli_dbgmsg("OLE2: %s\n", cl_strerror(ret));
if(!cli_leavetemps_flag)
cli_rmdirs(dir);
free(dir);
return ret;
}
if((ret = cli_vba_scandir(dir, ctx)) != CL_VIRUS) {
if(cli_scandir(dir, ctx) == CL_VIRUS) {
ret = CL_VIRUS;
}
}
if(!cli_leavetemps_flag)
cli_rmdirs(dir);
free(dir);
return ret;
}
static int cli_scantar(int desc, cli_ctx *ctx, unsigned int posix)
{
char *dir;
int ret = CL_CLEAN;
cli_dbgmsg("in cli_scantar()\n");
/* generate temporary directory */
dir = cli_gentemp(NULL);
if(mkdir(dir, 0700)) {
cli_errmsg("Tar: Can't create temporary directory %s\n", dir);
free(dir);
return CL_ETMPDIR;
}
if((ret = cli_untar(dir, desc, posix)))
cli_dbgmsg("Tar: %s\n", cl_strerror(ret));
else
ret = cli_scandir(dir, ctx);
if(!cli_leavetemps_flag)
cli_rmdirs(dir);
free(dir);
return ret;
}
static int cli_scanbinhex(int desc, cli_ctx *ctx)
{
char *dir;
int ret = CL_CLEAN;
cli_dbgmsg("in cli_scanbinhex()\n");
/* generate temporary directory */
dir = cli_gentemp(NULL);
if(mkdir(dir, 0700)) {
cli_errmsg("Binhex: Can't create temporary directory %s\n", dir);
free(dir);
return CL_ETMPDIR;
}
if((ret = cli_binhex(dir, desc)))
cli_dbgmsg("Binhex: %s\n", cl_strerror(ret));
else
ret = cli_scandir(dir, ctx);
if(!cli_leavetemps_flag)
cli_rmdirs(dir);
free(dir);
return ret;
}
static int cli_scanmschm(int desc, cli_ctx *ctx)
{
char *tempname;
int ret = CL_CLEAN;
cli_dbgmsg("in cli_scanmschm()\n");
tempname = cli_gentemp(NULL);
if(mkdir(tempname, 0700)) {
cli_dbgmsg("CHM: Can't create temporary directory %s\n", tempname);
free(tempname);
return CL_ETMPDIR;
}
if(chm_unpack(desc, tempname))
ret = cli_scandir(tempname, ctx);
if(!cli_leavetemps_flag)
cli_rmdirs(tempname);
free(tempname);
return ret;
}
static int cli_scanscrenc(int desc, cli_ctx *ctx)
{
char *tempname;
int ret = CL_CLEAN;
cli_dbgmsg("in cli_scanscrenc()\n");
tempname = cli_gentemp(NULL);
if(mkdir(tempname, 0700)) {
cli_dbgmsg("CHM: Can't create temporary directory %s\n", tempname);
free(tempname);
return CL_ETMPDIR;
}
if (html_screnc_decode(desc, tempname))
ret = cli_scandir(tempname, ctx);
if(!cli_leavetemps_flag)
cli_rmdirs(tempname);
free(tempname);
return ret;
}
static int cli_scanriff(int desc, const char **virname)
{
int ret = CL_CLEAN;
if(cli_check_riff_exploit(desc) == 2) {
ret = CL_VIRUS;
*virname = "Exploit.W32.MS05-002";
}
return ret;
}
static int cli_scanjpeg(int desc, const char **virname)
{
int ret = CL_CLEAN;
if(cli_check_jpeg_exploit(desc) == 1) {
ret = CL_VIRUS;
*virname = "Exploit.W32.MS04-028";
}
return ret;
}
static int cli_scancryptff(int desc, cli_ctx *ctx)
{
int ret = CL_CLEAN, i, ndesc;
unsigned int length;
unsigned char *src = NULL, *dest = NULL;
char *tempfile;
struct stat sb;
if(fstat(desc, &sb) == -1) {
cli_errmsg("CryptFF: Can's fstat descriptor %d\n", desc);
return CL_EIO;
}
/* Skip the CryptFF file header */
if(lseek(desc, 0x10, SEEK_SET) < 0) {
cli_errmsg("CryptFF: Can's fstat descriptor %d\n", desc);
return ret;
}
length = sb.st_size - 0x10;
if((dest = (unsigned char *) cli_malloc(length)) == NULL) {
cli_dbgmsg("CryptFF: Can't allocate memory\n");
return CL_EMEM;
}
if((src = (unsigned char *) cli_malloc(length)) == NULL) {
cli_dbgmsg("CryptFF: Can't allocate memory\n");
free(dest);
return CL_EMEM;
}
if((unsigned int) read(desc, src, length) != length) {
cli_dbgmsg("CryptFF: Can't read from descriptor %d\n", desc);
free(dest);
free(src);
return CL_EIO;
}
for(i = 0; i < length; i++)
dest[i] = src[i] ^ (unsigned char) 0xff;
free(src);
tempfile = cli_gentemp(NULL);
if((ndesc = open(tempfile, O_RDWR|O_CREAT|O_TRUNC, S_IRWXU)) < 0) {
cli_errmsg("CryptFF: Can't create file %s\n", tempfile);
free(dest);
free(tempfile);
return CL_EIO;
}
if(write(ndesc, dest, length) == -1) {
cli_dbgmsg("CryptFF: Can't write to descriptor %d\n", ndesc);
free(dest);
close(ndesc);
free(tempfile);
return CL_EIO;
}
free(dest);
if(fsync(ndesc) == -1) {
cli_errmsg("CryptFF: Can't fsync descriptor %d\n", ndesc);
close(ndesc);
free(tempfile);
return CL_EIO;
}
lseek(ndesc, 0, SEEK_SET);
cli_dbgmsg("CryptFF: Scanning decrypted data\n");
if((ret = cli_magic_scandesc(ndesc, ctx)) == CL_VIRUS)
cli_dbgmsg("CryptFF: Infected with %s\n", *ctx->virname);
close(ndesc);
if(cli_leavetemps_flag)
cli_dbgmsg("CryptFF: Decompressed data saved in %s\n", tempfile);
else
unlink(tempfile);
free(tempfile);
return ret;
}
static int cli_scanpdf(int desc, cli_ctx *ctx)
{
int ret;
char *dir = cli_gentemp(NULL);
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, desc, ctx);
if(ret == CL_CLEAN)
ret = cli_scandir(dir, ctx);
if(!cli_leavetemps_flag)
cli_rmdirs(dir);
free(dir);
return ret;
}
static int cli_scantnef(int desc, cli_ctx *ctx)
{
int ret;
char *dir = cli_gentemp(NULL);
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, desc);
if(ret == CL_CLEAN)
ret = cli_scandir(dir, ctx);
if(!cli_leavetemps_flag)
cli_rmdirs(dir);
free(dir);
return ret;
}
static int cli_scanuuencoded(int desc, cli_ctx *ctx)
{
int ret;
char *dir = cli_gentemp(NULL);
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, desc);
if(ret == CL_CLEAN)
ret = cli_scandir(dir, ctx);
if(!cli_leavetemps_flag)
cli_rmdirs(dir);
free(dir);
return ret;
}
static int cli_scanmail(int desc, cli_ctx *ctx)
{
char *dir;
int ret;
cli_dbgmsg("Starting cli_scanmail(), mrec == %d, arec == %d\n", ctx->mrec, ctx->arec);
/* generate the temporary directory */
dir = cli_gentemp(NULL);
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, desc, ctx->options))) {
if(!cli_leavetemps_flag)
cli_rmdirs(dir);
free(dir);
return ret;
}
ret = cli_scandir(dir, ctx);
if(!cli_leavetemps_flag)
cli_rmdirs(dir);
free(dir);
return ret;
}
static int cli_scanraw(int desc, cli_ctx *ctx, cli_file_t type)
{
int ret = CL_CLEAN, nret = CL_CLEAN;
unsigned short ftrec;
struct cli_matched_type *ftoffset = NULL, *fpt;
uint32_t lastzip, lastrar;
switch(type) {
case CL_TYPE_UNKNOWN_TEXT:
case CL_TYPE_MSEXE:
ftrec = 1;
break;
default:
ftrec = 0;
}
if(lseek(desc, 0, SEEK_SET) < 0) {
cli_errmsg("cli_scanraw: lseek() failed\n");
return CL_EIO;
}
if((ret = cli_scandesc(desc, ctx, ftrec, type, &ftoffset)) == CL_VIRUS) {
cli_dbgmsg("%s found in descriptor %d.\n", *ctx->virname, desc);
return CL_VIRUS;
} else if(ret < 0) {
return ret;
} else if(ret >= CL_TYPENO) {
lseek(desc, 0, SEEK_SET);
ret == CL_TYPE_MAIL ? ctx->mrec++ : ctx->arec++;
switch(ret) {
case CL_TYPE_HTML:
if(SCAN_HTML && type == CL_TYPE_UNKNOWN_TEXT)
if((nret = cli_scanhtml(desc, ctx)) == CL_VIRUS)
return CL_VIRUS;
break;
case CL_TYPE_MAIL:
if(SCAN_MAIL && type == CL_TYPE_UNKNOWN_TEXT)
if((nret = cli_scanmail(desc, ctx)) == CL_VIRUS)
return CL_VIRUS;
break;
case CL_TYPE_RARSFX:
case CL_TYPE_ZIPSFX:
if(type == CL_TYPE_MSEXE) {
if(SCAN_ARCHIVE) {
lastzip = lastrar = 0xdeadbeef;
fpt = ftoffset;
while(fpt) {
if(fpt->type == CL_TYPE_RARSFX) {
cli_dbgmsg("RAR-SFX signature found at %d\n", fpt->offset);
if((nret = cli_scanrar(desc, ctx, fpt->offset, &lastrar)) == CL_VIRUS)
break;
} else if(fpt->type == CL_TYPE_ZIPSFX) {
cli_dbgmsg("ZIP-SFX signature found at %d\n", fpt->offset);
if((nret = cli_scanzip(desc, ctx, fpt->offset, &lastzip)) == CL_VIRUS)
break;
}
fpt = fpt->next;
}
}
while(ftoffset) {
fpt = ftoffset;
ftoffset = ftoffset->next;
free(fpt);
}
if(nret == CL_VIRUS)
return nret;
}
break;
default:
break;
}
ret == CL_TYPE_MAIL ? ctx->mrec-- : ctx->arec--;
ret = nret;
}
return ret;
}
int cli_magic_scandesc(int desc, cli_ctx *ctx)
{
int ret = CL_CLEAN, nret;
int bread = 0;
cli_file_t type;
struct stat sb;
if(fstat(desc, &sb) == -1) {
cli_errmsg("Can's fstat descriptor %d\n", desc);
return CL_EIO;
}
if(sb.st_size <= 5) {
cli_dbgmsg("Small data (%d bytes)\n", sb.st_size);
return CL_CLEAN;
}
if(!ctx->engine) {
cli_errmsg("CRITICAL: engine == NULL\n");
return CL_EMALFDB;
}
if(!ctx->options) { /* raw mode (stdin, etc.) */
cli_dbgmsg("Raw mode: No support for special files\n");
if((ret = cli_scandesc(desc, ctx, 0, 0, NULL)) == CL_VIRUS)
cli_dbgmsg("%s found in descriptor %d\n", *ctx->virname, desc);
return ret;
}
if(SCAN_ARCHIVE && ctx->limits && ctx->limits->maxreclevel)
if(ctx->arec > ctx->limits->maxreclevel) {
cli_dbgmsg("Archive recursion limit exceeded (arec == %d).\n", ctx->arec);
if(BLOCKMAX) {
*ctx->virname = "Archive.ExceededRecursionLimit";
return CL_VIRUS;
}
return CL_CLEAN;
}
if(SCAN_MAIL)
if(ctx->mrec > MAX_MAIL_RECURSION) {
cli_dbgmsg("Mail recursion level exceeded (mrec == %d).\n", ctx->mrec);
/* return CL_EMAXREC; */
return CL_CLEAN;
}
lseek(desc, 0, SEEK_SET);
type = cli_filetype2(desc);
lseek(desc, 0, SEEK_SET);
if(type != CL_TYPE_DATA && ctx->engine->sdb) {
if((ret = cli_scanraw(desc, ctx, type)) == CL_VIRUS)
return CL_VIRUS;
lseek(desc, 0, SEEK_SET);
}
type == CL_TYPE_MAIL ? ctx->mrec++ : ctx->arec++;
switch(type) {
case CL_TYPE_RAR:
if(SCAN_ARCHIVE)
ret = cli_scanrar(desc, ctx, 0, NULL);
break;
case CL_TYPE_ZIP:
if(SCAN_ARCHIVE)
ret = cli_scanzip(desc, ctx, 0, NULL);
break;
case CL_TYPE_GZ:
if(SCAN_ARCHIVE)
ret = cli_scangzip(desc, ctx);
break;
case CL_TYPE_BZ:
#ifdef HAVE_BZLIB_H
if(SCAN_ARCHIVE)
ret = cli_scanbzip(desc, ctx);
#endif
break;
case CL_TYPE_MSSZDD:
if(SCAN_ARCHIVE)
ret = cli_scanszdd(desc, ctx);
break;
case CL_TYPE_MSCAB:
if(SCAN_ARCHIVE)
ret = cli_scanmscab(desc, ctx);
break;
case CL_TYPE_MAIL:
if(SCAN_MAIL)
ret = cli_scanmail(desc, ctx);
break;
case CL_TYPE_TNEF:
if(SCAN_MAIL)
ret = cli_scantnef(desc, ctx);
break;
case CL_TYPE_UUENCODED:
ret = cli_scanuuencoded(desc, ctx);
break;
case CL_TYPE_MSCHM:
if(SCAN_ARCHIVE)
ret = cli_scanmschm(desc, ctx);
break;
case CL_TYPE_MSOLE2:
if(SCAN_OLE2)
ret = cli_scanole2(desc, ctx);
break;
case CL_TYPE_POSIX_TAR:
if(SCAN_ARCHIVE)
ret = cli_scantar(desc, ctx, 1);
break;
case CL_TYPE_OLD_TAR:
if(SCAN_ARCHIVE)
ret = cli_scantar(desc, ctx, 0);
break;
case CL_TYPE_BINHEX:
if(SCAN_ARCHIVE)
ret = cli_scanbinhex(desc, ctx);
break;
case CL_TYPE_SCRENC:
ret = cli_scanscrenc(desc, ctx);
break;
case CL_TYPE_RIFF:
if(SCAN_ALGO)
ret = cli_scanriff(desc, ctx->virname);
break;
case CL_TYPE_GRAPHICS:
if(SCAN_ALGO)
ret = cli_scanjpeg(desc, ctx->virname);
break;
case CL_TYPE_PDF:
if(SCAN_ARCHIVE) /* you may wish to change this line */
ret = cli_scanpdf(desc, ctx);
break;
case CL_TYPE_CRYPTFF:
ret = cli_scancryptff(desc, ctx);
break;
case CL_TYPE_ELF: /* TODO: Add ScanELF option */
ret = cli_scanelf(desc, ctx);
break;
case CL_TYPE_SIS:
ret = cli_scansis(desc, ctx);
break;
case CL_TYPE_DATA:
/* it could be a false positive and a standard DOS .COM file */
{
struct stat s;
if(fstat(desc, &s) == 0 && S_ISREG(s.st_mode) && s.st_size < 65536)
type = CL_TYPE_UNKNOWN_DATA;
}
case CL_TYPE_UNKNOWN_DATA:
ret = cli_check_mydoom_log(desc, ctx->virname);
break;
default:
break;
}
type == CL_TYPE_MAIL ? ctx->mrec-- : ctx->arec--;
if(type != CL_TYPE_DATA && ret != CL_VIRUS && !ctx->engine->sdb) {
if(cli_scanraw(desc, ctx, type) == CL_VIRUS)
return CL_VIRUS;
}
ctx->arec++;
lseek(desc, 0, SEEK_SET);
switch(type) {
/* Due to performance reasons all executables were first scanned
* in raw mode. Now we will try to unpack them
*/
case CL_TYPE_MSEXE:
if(SCAN_PE)
ret = cli_scanpe(desc, ctx);
break;
default:
break;
}
ctx->arec--;
if(ret == CL_EFORMAT) {
cli_dbgmsg("Descriptor[%d]: %s\n", desc, cl_strerror(CL_EFORMAT));
return CL_CLEAN;
} else {
return ret;
}
}
int cl_scandesc(int desc, const char **virname, unsigned long int *scanned, const struct cl_engine *engine, const struct cl_limits *limits, unsigned int options)
{
cli_ctx ctx;
memset(&ctx, '\0', sizeof(cli_ctx));
ctx.engine = engine;
ctx.virname = virname;
ctx.limits = limits;
ctx.scanned = scanned;
ctx.options = options;
return cli_magic_scandesc(desc, &ctx);
}
static int cli_scanfile(const char *filename, cli_ctx *ctx)
{
int fd, ret;
/* internal version of cl_scanfile with arec/mrec preserved */
if((fd = open(filename, O_RDONLY)) == -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, const struct cl_limits *limits, unsigned int options)
{
int fd, ret;
if((fd = open(filename, O_RDONLY)) == -1)
return CL_EOPEN;
ret = cl_scandesc(fd, virname, scanned, engine, limits, options);
close(fd);
return ret;
}