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scapy_fuzz(v0.3).py
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scapy_fuzz(v0.3).py
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#!/usr/bin/python
# -*- coding: utf-8 -*-
import os
import random
from multiprocessing import Process, Queue
from random import choice
import binascii
from scapy.all import *
from scapy.layers.inet import TCP, IP
hello = "0300001611e00000001200c1020100c2020102c0010a"
set_comm = "0300001902f08032010000000000080000f0000001000101e0"
message_str = "0300002102f080320700000100000800080001120411440100ff09000400110000"
ROSCTR_dict = {0: '01', 1: '07'}
userdata_dict = {0: '01', 1: '02', 2: '03', 3: '07'}
Group_funciton_dict = {
1: {0: '01', 1: '02', 2: '0c', 3: '0e', 4: '0f', 5: '10', 6: '13'},
2: {0: '01', 1: '04'},
3: {0: '01', 1: '02', 2: '03'},
4: {0: '01', 1: '02', 2: '03'},
5: {0: '01'},
6: {0: ''},
7: {0: '01', 1: '02', 2: '03', 3: '04'}
}
Return_code_dict = {0: '00', 1: '01', 2: '03', 3: '05', 4: '06', 5: '07', 6: '0a', 7: 'ff'}
Transport_size_dict = {0: '00', 1: '03', 2: '04', 3: '05', 4: '06', 5: '07', 6: '09'}
testdata_str = "0300002102f080320700000100000800080001120411440100ff09000400110000"
''' S/SA/A/PA/R'''
flags = {0: 2L, 1: 18L, 2: 16L, 3: 24L, 4: 4L}
def random_String(n):
random_string = (''.join(map(lambda xx: (hex(ord(xx))[2:]), os.urandom(n))))
return random_string
def str2byte(data):
base = '0123456789ABCDEF'
i = 0
data = data.upper()
result = ''
while i < len(data):
beg = data[i]
end = data[i+1]
i += 2
b1 = base.find(beg)
b2 = base.find(end)
if b1 == -1 or b2 == -1:
return None
result += chr((b1 << 4) + b2)
return result
def s7_fuzz_packet():
''' Create TPKT '''
TPKT_Version = '03'
TPKT_Reserved = '00'
# TPKT_Length = randomString(1).zfill(2) + randomString(1).zfill(2)
TPKT_Length = ((hex(random.randint(58, 60)))[2:]).zfill(4)
TPKT = TPKT_Version + TPKT_Reserved + TPKT_Length
''' Create COTP '''
COTP_Length = '02'
# COTP_PDU_Type = ((hex(random.randint(0, 16)))[2:]) + '0'
COTP_PDU_Type = 'f0'
COTP_Last_data_unit = '80'
COTP = COTP_Length + COTP_PDU_Type + COTP_Last_data_unit
''' Create S7-Head'''
Protocol_ID = '32'
ROSCTR = ROSCTR_dict[random.randint(0, 1)]
Redundancy_Identification = '0000'
Protocol_Data_Unit_Reference = random_String(2).zfill(4)
Parameter_Length = '0008'
Head_Data_Length = (
hex(
((int(TPKT_Length, 16))*2 - 14 - 36)/2
)[2:]).zfill(4)
Header = Protocol_ID + ROSCTR + Redundancy_Identification + Protocol_Data_Unit_Reference\
+ Parameter_Length + Head_Data_Length
''' Create S7-Parameter '''
Parameter_head = '000112'
Parameter_length = '04'
Parameter_Request = random_String(1).zfill(2)
# Parameter_Type = str(random.randint(0, 16))
Parameter_Type = (random_String(1))[0]
Parameter_FunctionGroup = random.randint(1, 7)
Parameter_subfunciton = choice(Group_funciton_dict[Parameter_FunctionGroup])
Parameter_FunctionGroup = str(Parameter_FunctionGroup)
Parameter_Sequence_number = random_String(1).zfill(2)
Parameter = Parameter_head + Parameter_length + Parameter_Request + Parameter_Type + Parameter_FunctionGroup\
+ Parameter_subfunciton + Parameter_Sequence_number
''' Create S7-Data '''
Data_ReturnCode = Return_code_dict[random.randint(0, 7)]
Data_Transport_size = Transport_size_dict[random.randint(0, 6)]
Data_Length = (
(int(Head_Data_Length, 16) * 2) - 8
)/2
Data_Data = ''
Data_Data = random_String(Data_Length).zfill(Data_Length * 2)
Data_Length = (hex(Data_Length))[2:].zfill(4)
Data = Data_ReturnCode + Data_Transport_size + Data_Length + Data_Data
''' the fuzz packet '''
fuzz_pkt = TPKT + COTP + Header + Parameter + Data
return fuzz_pkt
def tcp_connect():
''' TCP HandShack'''
# SYN
SYN = TCP(sport=sport, dport=dport, flags='S', seq=0)
SYNACK = sr1(ip/SYN)
# print SYNACK
# ACK
ACK = TCP(sport=sport, dport=dport, flags='A', seq=SYNACK.ack, ack=SYNACK.seq + 1)
send(ip/ACK)
return SYNACK
def fuzz_sniff():
sniffer = sniff(filter="tcp and host 172.18.15.108", count=3)
for i in range(len(sniffer)):
tcp_flag = sniffer[i][2].flags
if tcp_flag == 24L:
tcp_load = sniffer[1][2].load
if tcp_load[:1] == '\x03\x00':
error_code = tcp_load[-2:]
print error_code
def hello_plc(self):
''' ShakeHand with PLC'''
# say hello
hello_data = str2byte(hello)
hello_packet = TCP(sport=sport, dport=dport, flags='PA', seq=self.ack, ack=self.seq + 1)
'''这里的测试代码访问返回的数据包，确认了返回数据的长度'''
# COTPACK = sr(ip/hello_packet/hello_data, multi=True, timeout=5)
COTPACK = sr(ip / hello_packet / hello_data, multi=True, timeout=5)
# print COTPACK[0][1]
comm_data = str2byte(set_comm)
comm_pkt = TCP(sport=sport, dport=dport, flags='PA',
seq=COTPACK[0][1][1].ack, ack=COTPACK[0][1][1].seq + len(COTPACK[0][1][1].load))
COMMACK = sr(ip / comm_pkt / comm_data, multi=True, timeout=5)
# print COMMACK[0][1]
# communication ack
comm_ack = TCP(sport=sport, dport=dport, flags='A',
seq=COMMACK[0][2][1].ack, ack=COMMACK[0][2][1].seq + len(COMMACK[0][2][1].load))
# print comm_ack.ack
send(ip/comm_ack)
return COMMACK
def fuzz(self):
fuzz_pkt = s7_fuzz_packet()
fuzz_pkt = str2byte(fuzz_pkt)
fuzzpkt = TCP(sport=sport, dport=dport, flags='PA',
seq=self[0][1][1].ack,
ack=self[0][1][1].seq + len(self[0][1][1].load))
# fuzz_ack = sr(ip/fuzzpkt/fuzz_pkt, multi=True, timeout=5)
fuzz_ack = sr1(ip / fuzzpkt / fuzz_pkt)
sniffer = sniff(filter="tcp and host 172.18.15.108", count=2, timeout=5)
return sniffer, fuzz_pkt, fuzz_ack
def fuzz_analysis(data):
if len(data[0]) == 0:
fuzzlog.write("%s\n" % binascii.hexlify(data[1]))
else:
errorlog.write("%s \n" % binascii.hexlify((data[0][1][2].load)[-2:]))
rst = TCP(sport=sport, dport=dport, flags='R', seq=data[2].ack)
send(ip / rst)
# VARIABLES
src = sys.argv[1]
dst = sys.argv[2]
dport = int(sys.argv[3])
if __name__=='__main__':
fuzzlog = open('fuzzlog.log', 'w+')
errorlog = open('error_code.log', 'w+')
while True:
sport = random.randint(1024, 65535)
ip = IP(src=src, dst=dst)
syn_ack = tcp_connect()
comm_ack = hello_plc(syn_ack)
fuzz_result = fuzz(comm_ack)
fuzz_analysis(fuzz_result)
rst = TCP(sport=sport, dport=dport, flags='R', seq=fuzz_result[2].ack)
send(ip / rst)