/*
* Copyright (C) 2002 - 2007 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 version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.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>
#ifndef C_WINDOWS
#include <dirent.h>
#include <netinet/in.h>
#endif
#if HAVE_MMAP
#if HAVE_SYS_MMAN_H
#include <sys/mman.h>
#else /* HAVE_SYS_MMAN_H */
#undef HAVE_MMAP
#endif
#endif
#ifndef O_BINARY
#define O_BINARY 0
#endif
extern short cli_leavetemps_flag;
#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 "unrar.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 "pst.h"
#include "sis.h"
#include "pdf.h"
#include "str.h"
#include "mspack.h"
#include "cab.h"
#include "rtf.h"
#ifdef HAVE_ZLIB_H
#include <zlib.h>
#include "unzip.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
#define MAX_MAIL_RECURSION 15
int cli_scannulsft(int desc, cli_ctx *ctx, off_t offset); /* FIXME */
static int cli_scanfile(const char *filename, cli_ctx *ctx);
static int cli_unrar_scanmetadata(int desc, rar_metadata_t *metadata, cli_ctx *ctx, unsigned int files, uint32_t* sfx_check)
{
int ret = CL_SUCCESS;
struct cli_meta_node* mdata;
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 (max: %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, 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;
return CL_VIRUS;
}
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, 0, NULL);
if(ret != CL_VIRUS) {
*ctx->virname = "Encrypted.RAR";
return CL_VIRUS;
}
}
/*
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;
}
*/
return ret;
}
static int cli_unrar_checklimits(const cli_ctx *ctx, const rar_metadata_t *metadata, unsigned int files)
{
if(ctx->limits) {
if(ctx->limits->maxratio && metadata->unpack_size && metadata->pack_size) {
if(metadata->unpack_size / metadata->pack_size >= ctx->limits->maxratio) {
cli_dbgmsg("RAR: Max ratio reached (%u, max: %u)\n", (unsigned int) (metadata->unpack_size / metadata->pack_size), ctx->limits->maxratio);
if(BLOCKMAX) {
*ctx->virname = "Oversized.RAR";
return CL_VIRUS;
}
return CL_EMAXSIZE;
}
}
if(ctx->limits->maxfilesize && (metadata->unpack_size > ctx->limits->maxfilesize)) {
cli_dbgmsg("RAR: %s: Size exceeded (%lu, max: %lu)\n", metadata->filename, (unsigned long int) metadata->unpack_size, ctx->limits->maxfilesize);
if(BLOCKMAX) {
*ctx->virname = "RAR.ExceededFileSize";
return CL_VIRUS;
}
return CL_EMAXSIZE;
}
if(ctx->limits->maxfiles && (files > ctx->limits->maxfiles)) {
cli_dbgmsg("RAR: Files limit reached (max: %u)\n", ctx->limits->maxfiles);
if(BLOCKMAX) {
*ctx->virname = "RAR.ExceededFilesLimit";
return CL_VIRUS;
}
return CL_EMAXFILES;
}
}
return CL_SUCCESS;
}
static int cli_scanrar(int desc, cli_ctx *ctx, off_t sfx_offset, uint32_t *sfx_check)
{
int ret = CL_CLEAN;
rar_metadata_t *metadata, *metadata_tmp;
char *dir;
rar_state_t rar_state;
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);
if((ret = cli_unrar_open(desc, dir, &rar_state)) != CL_SUCCESS) {
if(!cli_leavetemps_flag)
cli_rmdirs(dir);
free(dir);
cli_dbgmsg("RAR: Error: %s\n", cl_strerror(ret));
return ret;
}
do {
int rc;
rar_state.unpack_data->ofd = -1;
ret = cli_unrar_extract_next_prepare(&rar_state,dir);
if(ret != CL_SUCCESS)
break;
ret = cli_unrar_checklimits(ctx, rar_state.metadata_tail, rar_state.file_count);
if(ret && ret != CL_VIRUS) {
free(rar_state.file_header->filename);
free(rar_state.file_header);
ret = CL_CLEAN;
continue;
} else if(ret == CL_VIRUS) {
/* needed since we didn't reach unrar_extract_next to clean this up*/
free(rar_state.file_header->filename);
free(rar_state.file_header);
break;
}
ret = cli_unrar_extract_next(&rar_state,dir);
if(rar_state.unpack_data->ofd > 0) {
lseek(rar_state.unpack_data->ofd,0,SEEK_SET);
rc = cli_magic_scandesc(rar_state.unpack_data->ofd,ctx);
close(rar_state.unpack_data->ofd);
if(!cli_leavetemps_flag)
unlink(rar_state.filename);
if(rc == CL_VIRUS ) {
cli_dbgmsg("RAR: infected with %s\n",*ctx->virname);
ret = CL_VIRUS;
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(!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)
{
zip_dir *zdir;
zip_dirent zdirent;
zip_file *zfp;
FILE *tmp = NULL;
char *tmpname = NULL, *buff;
int fd, bytes, ret = CL_CLEAN;
unsigned long int size = 0;
unsigned int files = 0, encrypted, bfcnt;
struct stat source;
struct cli_meta_node *mdata;
int err;
uint8_t swarning = 0, fail, success;
cli_dbgmsg("in scanzip()\n");
if((zdir = zip_dir_open(desc, sfx_offset, &err)) == NULL) {
cli_dbgmsg("Zip: zip_dir_open() 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(%u)\n", FILEBUFF);
zip_dir_close(zdir);
return CL_EMEM;
}
while(zip_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) {
cli_dbgmsg("Zip: zdirent.d_name == NULL\n");
*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: %u, encrypted: %u, compressed: %u, normal: %u, method: %u, ratio: %u (max: %u)\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 != zdirent.d_crc32)
continue;
if(mdata->csize > 0 && (uint32_t) mdata->csize != zdirent.d_csize)
continue;
if(mdata->size >= 0 && (uint32_t) mdata->size != zdirent.st_size)
continue;
if(mdata->method >= 0 && (uint16_t) mdata->method != 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;
}
if(!zdirent.d_csize) {
cli_dbgmsg("Zip: Malformed file (d_csize == 0 but st_size != 0)\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(encrypted) {
if(DETECT_ENCRYPTED) {
cli_dbgmsg("Zip: Encrypted files found in archive.\n");
lseek(desc, 0, SEEK_SET);
ret = cli_scandesc(desc, ctx, 0, 0, 0, NULL);
if(ret < 0) {
break;
} else if(ret != CL_VIRUS) {
*ctx->virname = "Encrypted.Zip";
ret = CL_VIRUS;
}
break;
} else continue;
}
if(ctx->limits) {
if(ctx->limits->maxfilesize && ((unsigned int) zdirent.st_size > ctx->limits->maxfilesize)) {
cli_dbgmsg("Zip: %s: Size exceeded (%u, max: %lu)\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: %u)\n", ctx->limits->maxfiles);
if(BLOCKMAX) {
*ctx->virname = "Zip.ExceededFilesLimit";
ret = CL_VIRUS;
break;
}
break;
}
}
if((zfp = zip_file_open(zdir, zdirent.d_name, zdirent.d_off)) == NULL) {
if(zdir->errcode == CL_ESUPPORT) {
ret = CL_ESUPPORT;
if(!swarning) {
cli_warnmsg("Not supported compression method in one or more files\n");
swarning = 1;
}
continue;
} else {
cli_dbgmsg("Zip: Can't open file %s\n", zdirent.d_name);
ret = CL_EZIP;
break;
}
}
bfcnt = 0;
success = 0;
while(1) {
fail = 0;
/* generate temporary file and get its descriptor */
if((tmpname = cli_gentempstream(NULL, &tmp)) == NULL) {
cli_dbgmsg("Zip: Can't generate tmpfile().\n");
ret = CL_ETMPFILE;
break;
}
size = 0;
while((bytes = zip_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");
ret = CL_EIO;
break;
}
}
if(!encrypted) {
if(size != zdirent.st_size) {
cli_dbgmsg("Zip: Incorrectly decompressed (%lu != %lu)\n", size, (unsigned long int) zdirent.st_size);
if(zfp->bf[0] == -1) {
ret = CL_EZIP;
break;
} else {
fail = 1;
}
} else {
cli_dbgmsg("Zip: File decompressed to %s\n", tmpname);
success = 1;
}
}
if(!fail) {
if(fflush(tmp) != 0) {
cli_dbgmsg("Zip: fflush() failed\n");
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;
}
}
if(tmp) {
fclose(tmp);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
tmp = NULL;
}
if(zfp->bf[bfcnt] == -1)
break;
zfp->method = (uint16_t) zfp->bf[bfcnt];
cli_dbgmsg("Zip: Brute force mode - checking compression method %u\n", zfp->method);
bfcnt++;
}
zip_file_close(zfp);
if(!ret && !encrypted && !success) { /* brute-force decompression failed */
cli_dbgmsg("Zip: All attempts to decompress file failed\n");
ret = CL_EZIP;
}
if(ret)
break;
}
zip_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 %u 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 *) cli_malloc(FILEBUFF))) {
cli_dbgmsg("Bzip: Unable to malloc %u 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, off_t sfx_offset)
{
char *tempname;
int ret;
unsigned int files = 0;
struct cab_archive cab;
struct cab_file *file;
cli_dbgmsg("in cli_scanmscab()\n");
if((ret = cab_open(desc, sfx_offset, &cab)))
return ret;
for(file = cab.files; file; file = file->next) {
files++;
if(ctx->limits && ctx->limits->maxfilesize && (file->length > ctx->limits->maxfilesize)) {
cli_dbgmsg("CAB: %s: Size exceeded (%u, max: %lu)\n", file->name, file->length, ctx->limits->maxfilesize);
if(BLOCKMAX) {
*ctx->virname = "CAB.ExceededFileSize";
cab_free(&cab);
return CL_VIRUS;
}
continue;
}
if(ctx->limits && ctx->limits->maxfiles && (files > ctx->limits->maxfiles)) {
cli_dbgmsg("CAB: Files limit reached (max: %u)\n", ctx->limits->maxfiles);
cab_free(&cab);
if(BLOCKMAX) {
*ctx->virname = "CAB.ExceededFilesLimit";
return CL_VIRUS;
}
return CL_CLEAN;
}
tempname = cli_gentemp(NULL);
cli_dbgmsg("CAB: Extracting file %s to %s, size %u\n", file->name, tempname, file->length);
if((ret = cab_extract(file, tempname)))
cli_dbgmsg("CAB: Failed to extract file: %s\n", cl_strerror(ret));
else
ret = cli_scanfile(tempname, ctx);
if(!cli_leavetemps_flag)
unlink(tempname);
free(tempname);
if(ret == CL_VIRUS)
break;
}
cab_free(&cab);
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
#if (!defined(C_CYGWIN)) && (!defined(C_INTERIX)) && (!defined(C_WINDOWS))
if(dent->d_ino)
#endif
{
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/%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);
if(!fullname) {
ret = CL_EMEM;
break;
}
sprintf(fullname, "%s/%s", vba_project->dir, vba_project->name[i]);
fd = open(fullname, O_RDONLY|O_BINARY);
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(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);
if(!fullname) {
ret = CL_EMEM;
break;
}
sprintf(fullname, "%s/%s", vba_project->dir, vba_project->name[i]);
fd = open(fullname, O_RDONLY|O_BINARY);
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 length:%d\n", vba_project->name[i], i, vba_project->key[i], vba_project->length[i]);
if(vba_project->length[i])
data = (unsigned char *) wm_decrypt_macro(fd, vba_project->offset[i], vba_project->length[i], vba_project->key[i]);
else
data = NULL;
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(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);
if(!fullname)
return CL_EMEM;
sprintf(fullname, "%s/_1_Ole10Native", dirname);
fd = open(fullname, O_RDONLY|O_BINARY);
free(fullname);
if (fd >= 0) {
ofd = cli_decode_ole_object(fd, dirname);
if (ofd >= 0) {
ret = cli_scandesc(ofd, ctx, 0, 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
#if (!defined(C_CYGWIN)) && (!defined(C_INTERIX)) && (!defined(C_WINDOWS))
if(dent->d_ino)
#endif
{
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) {
ret = CL_EMEM;
break;
}
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;
struct stat sb;
cli_dbgmsg("in cli_scanhtml()\n");
if(fstat(desc, &sb) == -1) {
cli_errmsg("cli_scanhtml: fstat() failed for descriptor %d\n", desc);
return CL_EIO;
}
/* Because HTML detection is FP-prone and html_normalise_fd() needs to
* mmap the file don't normalise files larger than 10 MB.
*/
if(sb.st_size > 10485760) {
cli_dbgmsg("cli_scanhtml: exiting (file larger than 10 MB)\n");
return CL_CLEAN;
}
tempname = cli_gentemp(NULL);
if(mkdir(tempname, 0700)) {
cli_errmsg("cli_scanhtml: Can't create temporary directory %s\n", tempname);
free(tempname);
return CL_ETMPDIR;
}
html_normalise_fd(desc, tempname, NULL, ctx->dconf);
snprintf(fullname, 1024, "%s/comment.html", tempname);
fd = open(fullname, O_RDONLY|O_BINARY);
if (fd >= 0) {
ret = cli_scandesc(fd, ctx, 0, CL_TYPE_HTML, 0, 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|O_BINARY);
if (fd >= 0) {
ret = cli_scandesc(fd, ctx, 0, CL_TYPE_HTML, 0, 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|O_BINARY);
if (fd >= 0) {
ret = cli_scandesc(fd, ctx, 0, CL_TYPE_HTML, 0, 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_scanhtml_utf16(int desc, cli_ctx *ctx)
{
char *tempname, buff[512], *decoded;
int ret = CL_CLEAN, fd, bytes;
cli_dbgmsg("in cli_scanhtml_utf16()\n");
tempname = cli_gentemp(NULL);
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_EIO;
}
while((bytes = read(desc, buff, sizeof(buff))) > 0) {
decoded = cli_utf16toascii(buff, bytes);
if(decoded) {
if(write(fd, decoded, strlen(decoded)) == -1) {
cli_errmsg("cli_scanhtml_utf16: Can't write to file %s\n", tempname);
free(decoded);
unlink(tempname);
free(tempname);
close(fd);
return CL_EIO;
}
free(decoded);
}
}
fsync(fd);
lseek(fd, 0, SEEK_SET);
ret = cli_scanhtml(fd, ctx);
close(fd);
if(!cli_leavetemps_flag)
unlink(tempname);
else
cli_dbgmsg("cli_scanhtml_utf16: Decoded HTML data saved in %s\n", 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, ctx->limits)))
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, ndesc;
unsigned int length, i;
unsigned char *src = NULL, *dest = NULL;
char *tempfile;
struct stat sb;
if(fstat(desc, &sb) == -1) {
cli_errmsg("CryptFF: Can't fstat descriptor %d\n", desc);
return CL_EIO;
}
/* Skip the CryptFF file header */
if(lseek(desc, 0x10, SEEK_SET) < 0) {
cli_errmsg("CryptFF: Can't lseek 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|O_BINARY, 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;
}
/* Outlook PST file */
static int cli_scanpst(int desc, cli_ctx *ctx)
{
int ret;
char *dir = cli_gentemp(NULL);
if(mkdir(dir, 0700)) {
cli_dbgmsg("Can't create temporary directory for PST file %s\n", dir);
free(dir);
return CL_ETMPDIR;
}
ret = cli_pst(dir, desc);
if(ret == CL_SUCCESS)
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 == %u, arec == %u\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))) {
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_scanembpe(int desc, cli_ctx *ctx)
{
int fd, bytes, ret = CL_CLEAN;
unsigned long int size = 0;
char buff[512];
char *tmpname;
tmpname = cli_gentemp(NULL);
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_EIO;
}
while((bytes = read(desc, buff, sizeof(buff))) > 0) {
size += bytes;
if(ctx->limits && ctx->limits->maxfilesize && (size + sizeof(buff) > ctx->limits->maxfilesize)) {
cli_dbgmsg("cli_scanembpe: Size exceeded (stopped at %lu, max: %lu)\n", size, ctx->limits->maxfilesize);
/* BLOCKMAX should be ignored here */
break;
}
if(cli_writen(fd, buff, bytes) != bytes) {
cli_dbgmsg("cli_scanembpe: Can't write to temporary file\n");
close(fd);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
return CL_EIO;
}
}
if(fsync(fd) == -1) {
cli_dbgmsg("cli_scanembpe: Can't synchronise descriptor %d\n", fd);
close(fd);
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("cli_scanembpe: Infected with %s\n", *ctx->virname);
close(fd);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
return CL_VIRUS;
}
close(fd);
if(!cli_leavetemps_flag)
unlink(tmpname);
free(tmpname);
/* intentionally ignore possible errors from cli_magic_scandesc */
return CL_CLEAN;
}
static int cli_scanraw(int desc, cli_ctx *ctx, cli_file_t type)
{
int ret = CL_CLEAN, nret = CL_CLEAN;
uint8_t ftrec, break_loop = 0;
struct cli_matched_type *ftoffset = NULL, *fpt;
uint32_t lastzip, lastrar;
struct cli_exe_info peinfo;
switch(type) {
case CL_TYPE_UNKNOWN_TEXT:
case CL_TYPE_MSEXE:
case CL_TYPE_ZIP:
ftrec = 1;
break;
default:
ftrec = 0;
}
if(lseek(desc, 0, SEEK_SET) < 0) {
cli_errmsg("cli_scanraw: lseek() failed\n");
return CL_EIO;
}
ret = cli_scandesc(desc, ctx, ftrec, type, 0, &ftoffset);
if(ret >= CL_TYPENO) {
if(type == CL_TYPE_UNKNOWN_TEXT) {
lseek(desc, 0, SEEK_SET);
nret = cli_scandesc(desc, ctx, 0, ret, 1, NULL);
if(nret == CL_VIRUS)
cli_dbgmsg("%s found in descriptor %d when scanning file type %u\n", *ctx->virname, desc, ret);
}
if(nret != CL_VIRUS && (type == CL_TYPE_MSEXE || type == CL_TYPE_ZIP)) {
lastzip = lastrar = 0xdeadbeef;
fpt = ftoffset;
while(fpt) {
switch(fpt->type) {
case CL_TYPE_RARSFX:
if(SCAN_ARCHIVE && type == CL_TYPE_MSEXE && (DCONF_ARCH & ARCH_CONF_RAR)) {
cli_dbgmsg("RAR-SFX signature found at %u\n", (unsigned int) fpt->offset);
nret = cli_scanrar(desc, ctx, fpt->offset, &lastrar);
}
break;
case CL_TYPE_ZIPSFX:
if(SCAN_ARCHIVE && type == CL_TYPE_MSEXE && (DCONF_ARCH & ARCH_CONF_ZIP)) {
cli_dbgmsg("ZIP-SFX signature found at %u\n", (unsigned int) fpt->offset);
nret = cli_scanzip(desc, ctx, fpt->offset, &lastzip);
}
break;
case CL_TYPE_CABSFX:
if(SCAN_ARCHIVE && type == CL_TYPE_MSEXE && (DCONF_ARCH & ARCH_CONF_CAB)) {
cli_dbgmsg("CAB-SFX signature found at %u\n", (unsigned int) fpt->offset);
nret = cli_scanmscab(desc, ctx, fpt->offset);
}
break;
case CL_TYPE_NULSFT:
if(SCAN_ARCHIVE && type == CL_TYPE_MSEXE && (DCONF_ARCH & ARCH_CONF_NSIS) && fpt->offset > 4) {
cli_dbgmsg("NSIS signature found at %u\n", (unsigned int) fpt->offset-4);
nret = cli_scannulsft(desc, ctx, fpt->offset - 4);
}
break;
case CL_TYPE_MSEXE:
if(SCAN_PE && ctx->dconf->pe && fpt->offset) {
cli_dbgmsg("PE signature found at %u\n", (unsigned int) fpt->offset);
memset(&peinfo, 0, sizeof(struct cli_exe_info));
peinfo.offset = fpt->offset;
lseek(desc, fpt->offset, SEEK_SET);
if(cli_peheader(desc, &peinfo) == 0) {
cli_dbgmsg("*** Detected embedded PE file ***\n");
if(peinfo.section)
free(peinfo.section);
lseek(desc, fpt->offset, SEEK_SET);
nret = cli_scanembpe(desc, ctx);
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;
}
}
ret == CL_TYPE_MAIL ? ctx->mrec++ : ctx->arec++;
if(nret != CL_VIRUS) switch(ret) {
case CL_TYPE_HTML:
if(SCAN_HTML && type == CL_TYPE_UNKNOWN_TEXT && (DCONF_DOC & DOC_CONF_HTML))
nret = cli_scanhtml(desc, ctx);
break;
case CL_TYPE_MAIL:
if(SCAN_MAIL && type == CL_TYPE_UNKNOWN_TEXT && (DCONF_MAIL & MAIL_CONF_MBOX))
nret = cli_scanmail(desc, ctx);
break;
default:
break;
}
ret == CL_TYPE_MAIL ? ctx->mrec-- : ctx->arec--;
ret = nret;
}
while(ftoffset) {
fpt = ftoffset;
ftoffset = ftoffset->next;
free(fpt);
}
if(ret == CL_VIRUS)
cli_dbgmsg("%s found in descriptor %d\n", *ctx->virname, desc);
return ret;
}
int cli_magic_scandesc(int desc, cli_ctx *ctx)
{
int ret = CL_CLEAN;
cli_file_t type;
struct stat sb;
if(fstat(desc, &sb) == -1) {
cli_errmsg("Can't fstat descriptor %d\n", desc);
return CL_EIO;
}
if(sb.st_size <= 5) {
cli_dbgmsg("Small data (%u bytes)\n", (unsigned int) 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, 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 == %u).\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 == %u).\n", ctx->mrec);
/* return CL_EMAXREC; */
return CL_CLEAN;
}
lseek(desc, 0, SEEK_SET);
type = cli_filetype2(desc, ctx->engine);
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 && (DCONF_ARCH & ARCH_CONF_RAR))
ret = cli_scanrar(desc, ctx, 0, NULL);
break;
case CL_TYPE_ZIP:
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_ZIP))
ret = cli_scanzip(desc, ctx, 0, NULL);
break;
case CL_TYPE_GZ:
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_GZ))
ret = cli_scangzip(desc, ctx);
break;
case CL_TYPE_BZ:
#ifdef HAVE_BZLIB_H
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_BZ))
ret = cli_scanbzip(desc, ctx);
#endif
break;
case CL_TYPE_NULSFT:
if(SCAN_ARCHIVE)
ret = cli_scannulsft(desc, ctx, 0);
break;
case CL_TYPE_MSSZDD:
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_SZDD))
ret = cli_scanszdd(desc, ctx);
break;
case CL_TYPE_MSCAB:
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_CAB))
ret = cli_scanmscab(desc, ctx, 0);
break;
case CL_TYPE_HTML:
if(SCAN_HTML && (DCONF_DOC & DOC_CONF_HTML))
ret = cli_scanhtml(desc, ctx);
break;
case CL_TYPE_HTML_UTF16:
if(SCAN_HTML && (DCONF_DOC & DOC_CONF_HTML))
ret = cli_scanhtml_utf16(desc, ctx);
break;
case CL_TYPE_RTF:
if(DCONF_DOC & DOC_CONF_RTF)
ret = cli_scanrtf(desc, ctx);
break;
case CL_TYPE_MAIL:
if(SCAN_MAIL && (DCONF_MAIL & MAIL_CONF_MBOX))
ret = cli_scanmail(desc, ctx);
break;
case CL_TYPE_TNEF:
if(SCAN_MAIL && (DCONF_MAIL & MAIL_CONF_TNEF))
ret = cli_scantnef(desc, ctx);
break;
case CL_TYPE_UUENCODED:
if(DCONF_OTHER & OTHER_CONF_UUENC)
ret = cli_scanuuencoded(desc, ctx);
break;
case CL_TYPE_PST:
if(SCAN_MAIL && (DCONF_MAIL & MAIL_CONF_PST))
ret = cli_scanpst(desc, ctx);
break;
case CL_TYPE_MSCHM:
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_CHM))
ret = cli_scanmschm(desc, ctx);
break;
case CL_TYPE_MSOLE2:
if(SCAN_OLE2 && (DCONF_ARCH & ARCH_CONF_OLE2))
ret = cli_scanole2(desc, ctx);
break;
case CL_TYPE_POSIX_TAR:
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_TAR))
ret = cli_scantar(desc, ctx, 1);
break;
case CL_TYPE_OLD_TAR:
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_TAR))
ret = cli_scantar(desc, ctx, 0);
break;
case CL_TYPE_BINHEX:
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_BINHEX))
ret = cli_scanbinhex(desc, ctx);
break;
case CL_TYPE_SCRENC:
if(DCONF_OTHER & OTHER_CONF_SCRENC)
ret = cli_scanscrenc(desc, ctx);
break;
case CL_TYPE_RIFF:
if(SCAN_ALGO && (DCONF_OTHER & OTHER_CONF_RIFF))
ret = cli_scanriff(desc, ctx->virname);
break;
case CL_TYPE_GRAPHICS:
if(SCAN_ALGO && (DCONF_OTHER & OTHER_CONF_JPEG))
ret = cli_scanjpeg(desc, ctx->virname);
break;
case CL_TYPE_PDF:
if(SCAN_PDF && (DCONF_DOC & DOC_CONF_PDF))
ret = cli_scanpdf(desc, ctx);
break;
case CL_TYPE_CRYPTFF:
if(DCONF_OTHER & OTHER_CONF_CRYPTFF)
ret = cli_scancryptff(desc, ctx);
break;
case CL_TYPE_ELF:
if(SCAN_ELF && ctx->dconf->elf)
ret = cli_scanelf(desc, ctx);
break;
case CL_TYPE_SIS:
if(SCAN_ARCHIVE && (DCONF_ARCH & ARCH_CONF_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 && ctx->dconf->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;
int rc;
memset(&ctx, '\0', sizeof(cli_ctx));
ctx.engine = engine;
ctx.virname = virname;
ctx.limits = limits;
ctx.scanned = scanned;
ctx.options = options;
ctx.found_possibly_unwanted = 0;
ctx.dconf = (struct cli_dconf *) engine->dconf;
rc = cli_magic_scandesc(desc, &ctx);
if(rc == CL_CLEAN && ctx.found_possibly_unwanted)
rc = CL_VIRUS;
return rc;
}
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|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, const struct cl_limits *limits, unsigned int options)
{
int fd, ret;
if((fd = open(filename, O_RDONLY|O_BINARY)) == -1)
return CL_EOPEN;
ret = cl_scandesc(fd, virname, scanned, engine, limits, options);
close(fd);
return ret;
}