CTF 专用文件监控系统
# -*- coding: utf-8 -*-
#use: python file_check.py ./
import os
import hashlib
import shutil
import ntpath
import time
CWD = os.getcwd()
FILE_MD5_DICT = {} # 文件MD5字典
ORIGIN_FILE_LIST = []
# 特殊文件路径字符串
Special_path_str = 'drops_JWI96TY7ZKNMQPDRUOSG0FLH41A3C5EXVB82'
bakstring = 'bak_EAR1IBM0JT9HZ75WU4Y3Q8KLPCX26NDFOGVS'
logstring = 'log_WMY4RVTLAJFB28960SC3KZX7EUP1IHOQN5GD'
webshellstring = 'webshell_WMY4RVTLAJFB28960SC3KZX7EUP1IHOQN5GD'
difffile = 'diff_UMTGPJO17F82K35Z0LEDA6QB9WH4IYRXVSCN'
Special_string = 'drops_log' # 免死金牌
UNICODE_ENCODING = "utf-8"
INVALID_UNICODE_CHAR_FORMAT = r"\?%02x"
# 文件路径字典
spec_base_path = os.path.realpath(os.path.join(CWD, Special_path_str))
Special_path = {
'bak' : os.path.realpath(os.path.join(spec_base_path, bakstring)),
'log' : os.path.realpath(os.path.join(spec_base_path, logstring)),
'webshell' : os.path.realpath(os.path.join(spec_base_path, webshellstring)),
'difffile' : os.path.realpath(os.path.join(spec_base_path, difffile)),
}
def isListLike(value):
return isinstance(value, (list, tuple, set))
# 获取Unicode编码
def getUnicode(value, encoding=None, noneToNull=False):
if noneToNull and value is None:
return Null
if isListLike(value):
value = list(getUnicode(_, encoding, noneToNull) for _ in value)
return value
if isinstance(value, unicode):
return value
elif isinstance(value, basestring):
while True:
try:
return unicode(value, encoding or UNICODE_ENCODING)
except UnicodeDecodeError, ex:
try:
return unicode(value, UNICODE_ENCODING)
except:
value = value[:ex.start] + "".join(INVALID_UNICODE_CHAR_FORMAT % ord(_) for _ in value[ex.start:ex.end]) + value[ex.end:]
else:
try:
return unicode(value)
except UnicodeDecodeError:
return unicode(str(value), errors="ignore")
# 目录创建
def mkdir_p(path):
import errno
try:
os.makedirs(path)
except OSError as exc:
if exc.errno == errno.EEXIST and os.path.isdir(path):
pass
else: raise
# 获取当前所有文件路径
def getfilelist(cwd):
filelist = []
for root,subdirs, files in os.walk(cwd):
for filepath in files:
originalfile = os.path.join(root, filepath)
if Special_path_str not in originalfile:
filelist.append(originalfile)
return filelist
# 计算机文件MD5值
def calcMD5(filepath):
try:
with open(filepath,'rb') as f:
md5obj = hashlib.md5()
md5obj.update(f.read())
hash = md5obj.hexdigest()
return hash
except Exception, e:
print u'[!] getmd5_error : ' + getUnicode(filepath)
print getUnicode(e)
try:
ORIGIN_FILE_LIST.remove(filepath)
FILE_MD5_DICT.pop(filepath, None)
except KeyError, e:
pass
# 获取所有文件MD5
def getfilemd5dict(filelist = []):
filemd5dict = {}
for ori_file in filelist:
if Special_path_str not in ori_file:
md5 = calcMD5(os.path.realpath(ori_file))
if md5:
filemd5dict[ori_file] = md5
return filemd5dict
# 备份所有文件
def backup_file(filelist=[]):
# if len(os.listdir(Special_path['bak'])) == 0:
for filepath in filelist:
if Special_path_str not in filepath:
shutil.copy2(filepath, Special_path['bak'])
if __name__ == '__main__':
print u'---------start------------'
for value in Special_path:
mkdir_p(Special_path[value])
# 获取所有文件路径，并获取所有文件的MD5，同时备份所有文件
ORIGIN_FILE_LIST = getfilelist(CWD)
FILE_MD5_DICT = getfilemd5dict(ORIGIN_FILE_LIST)
backup_file(ORIGIN_FILE_LIST) # TODO 备份文件可能会产生重名BUG
print u'[*] pre work end!'
while True:
file_list = getfilelist(CWD)
# 移除新上传文件
diff_file_list = list(set(file_list) ^ set(ORIGIN_FILE_LIST))
if len(diff_file_list) != 0:
# import pdb;pdb.set_trace()
for filepath in diff_file_list:
try:
f = open(filepath, 'r').read()
except Exception, e:
break
if Special_string not in f:
try:
print u'[*] webshell find : ' + getUnicode(filepath)
shutil.move(filepath, os.path.join(Special_path['webshell'], ntpath.basename(filepath) + '.txt'))
except Exception as e:
print u'[!] move webshell error, "%s" maybe is webshell.'%getUnicode(filepath)
try:
f = open(os.path.join(Special_path['log'], 'log.txt'), 'a')
f.write('newfile: ' + getUnicode(filepath) + ' : ' + str(time.ctime()) + '\n')
f.close()
except Exception as e:
print u'[-] log error : file move error: ' + getUnicode(e)
# 防止任意文件被修改,还原被修改文件
md5_dict = getfilemd5dict(ORIGIN_FILE_LIST)
for filekey in md5_dict:
if md5_dict[filekey] != FILE_MD5_DICT[filekey]:
try:
f = open(filekey, 'r').read()
except Exception, e:
break
if Special_string not in f:
try:
print u'[*] file had be change : ' + getUnicode(filekey)
shutil.move(filekey, os.path.join(Special_path['difffile'], ntpath.basename(filekey) + '.txt'))
shutil.move(os.path.join(Special_path['bak'], ntpath.basename(filekey)), filekey)
except Exception as e:
print u'[!] move webshell error, "%s" maybe is webshell.'%getUnicode(filekey)
try:
f = open(os.path.join(Special_path['log'], 'log.txt'), 'a')
f.write('diff_file: ' + getUnicode(filekey) + ' : ' + getUnicode(time.ctime()) + '\n')
f.close()
except Exception as e:
print u'[-] log error : done_diff: ' + getUnicode(filekey)
pass
time.sleep(2)
# print '[*] ' + getUnicode(time.ctime())
