def mutate(self, packets):
numseg = self.numseg
position = self.position
# Not enough segments, Syn or Ack, return
if (
utils.check_length(numseg, packets)
or utils.check_syn(packets[numseg - 1])
or utils.check_ack(packets[numseg - 1])
):
return packets
forged = packets[numseg - 1].copy()
forged = utils.tcp_bad_payload(forged)
# calculate and modify chksum
forged.chksum = scapy.checksum(forged) + 1
"""il frammento manipolato dovrebbe essere preso per buono da
snort -k notcp ma scartato da host vittima. """
# insert forged segment
if position == "after":
packets.insert(numseg, forged)
elif position == "before":
packets.insert(numseg - 1, forged)
# last position is for original packet, not the forged one!!!!
elif position == "last":
packets.append(packets[numseg - 1])
del (packets[numseg - 1])
packets.insert(numseg - 1, forged)
return packets
def mutate(self, packets): result = [] numseg = self.numseg timer = self.timer #Not enough segments, Syn or Ack, return if utils.check_length(numseg, packets) or utils.check_syn(packets[numseg-1]) or utils.check_ack(packets[numseg-1]): return packets forged = packets[numseg-1].copy() forged = utils.tcp_bad_payload(forged, utils.NOPAYLOAD) forged.flags = 'R' #calculate and modify chksum forged.chksum = scapy.checksum(forged)+1 packets.insert(numseg-1, forged) packets[numseg].timeout = timer return packets
