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FeatureExtractor.py
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#Check if cython code has been compiled
import os
import subprocess
use_extrapolation=False #experimental correlation code
if use_extrapolation:
print("Importing AfterImage Cython Library")
if not os.path.isfile("AfterImage.c"): #has not yet been compiled, so try to do so...
cmd = "python setup.py build_ext --inplace"
subprocess.call(cmd,shell=True)
#Import dependencies
import netStat as ns
import csv
import numpy as np
print("Importing Scapy Library")
from scapy.all import *
from scapy.layers.l2 import Ether
import os.path
import platform
import subprocess
#Extracts Kitsune features from given pcap file one packet at a time using "get_next_vector()"
# If wireshark is installed (tshark) it is used to parse (it's faster), otherwise, scapy is used (much slower).
# If wireshark is used then a tsv file (parsed version of the pcap) will be made -which you can use as your input next time
class FE:
def __init__(self,file_path,limit=np.inf):
self.path = file_path
self.limit = limit
self.parse_type = None #unknown
self.curPacketIndx = 0
self.tsvin = None #used for parsing TSV file
self.scapyin = None #used for parsing pcap with scapy
### Prep pcap ##
self.__prep__()
### Prep Feature extractor (AfterImage) ###
maxHost = 100000000000
maxSess = 100000000000
self.nstat = ns.netStat(np.nan, maxHost, maxSess)
def _get_tshark_path(self):
if platform.system() == 'Windows':
return 'C:\Program Files\Wireshark\\tshark.exe'
else:
system_path = os.environ['PATH']
for path in system_path.split(os.pathsep):
filename = os.path.join(path, 'tshark')
if os.path.isfile(filename):
return filename
return ''
def __prep__(self):
### Find file: ###
if not os.path.isfile(self.path): # file does not exist
print("File: " + self.path + " does not exist")
raise Exception()
### check file type ###
type = self.path.split('.')[-1]
self._tshark = self._get_tshark_path()
##If file is TSV (pre-parsed by wireshark script)
if type == "tsv":
self.parse_type = "tsv"
##If file is pcap
elif type == "pcap" or type == 'pcapng':
# Try parsing via tshark dll of wireshark (faster)
if os.path.isfile(self._tshark):
self.pcap2tsv_with_tshark() # creates local tsv file
self.path += ".tsv"
self.parse_type = "tsv"
else: # Otherwise, parse with scapy (slower)
print("tshark not found. Trying scapy...")
self.parse_type = "scapy"
else:
print("File: " + self.path + " is not a tsv or pcap file")
raise Exception()
### open readers ##
if self.parse_type == "tsv":
maxInt = sys.maxsize
decrement = True
while decrement:
# decrease the maxInt value by factor 10
# as long as the OverflowError occurs.
decrement = False
try:
csv.field_size_limit(maxInt)
except OverflowError:
maxInt = int(maxInt / 10)
decrement = True
print("counting lines in file...")
num_lines = sum(1 for line in open(self.path))
print("There are " + str(num_lines) + " Packets.")
self.limit = min(self.limit, num_lines-1)
self.tsvinf = open(self.path, 'rt', encoding="utf8")
self.tsvin = csv.reader(self.tsvinf, delimiter='\t')
row = self.tsvin.__next__() #move iterator past header
else: # scapy
print("Reading PCAP file via Scapy...")
self.scapyin = rdpcap(self.path)
self.limit = min(len(self.scapyin), self.limit)
print("Loaded " + str(len(self.scapyin)) + " Packets.")
def get_next_vector(self):
if self.curPacketIndx >= self.limit:
if self.parse_type == 'tsv':
self.tsvinf.close()
return []
### Parse next packet ###
if self.parse_type == "tsv":
row = self.tsvin.__next__()
IPtype = np.nan
timestamp = row[0]
framelen = row[1]
srcIP = ''
dstIP = ''
if row[4] != '': # IPv4
srcIP = row[4]
dstIP = row[5]
IPtype = 0
elif row[17] != '': # ipv6
srcIP = row[17]
dstIP = row[18]
IPtype = 1
srcproto = row[6] + row[
8] # UDP or TCP port: the concatenation of the two port strings will will results in an OR "[tcp|udp]"
dstproto = row[7] + row[9] # UDP or TCP port
srcMAC = row[2]
dstMAC = row[3]
if srcproto == '': # it's a L2/L1 level protocol
if row[12] != '': # is ARP
srcproto = 'arp'
dstproto = 'arp'
srcIP = row[14] # src IP (ARP)
dstIP = row[16] # dst IP (ARP)
IPtype = 0
elif row[10] != '': # is ICMP
srcproto = 'icmp'
dstproto = 'icmp'
IPtype = 0
elif srcIP + srcproto + dstIP + dstproto == '': # some other protocol
srcIP = row[2] # src MAC
dstIP = row[3] # dst MAC
elif self.parse_type == "scapy":
packet = self.scapyin[self.curPacketIndx]
IPtype = np.nan
timestamp = packet.time
framelen = len(packet)
if packet.haslayer(IP): # IPv4
srcIP = packet[IP].src
dstIP = packet[IP].dst
IPtype = 0
elif packet.haslayer(IPv6): # ipv6
srcIP = packet[IPv6].src
dstIP = packet[IPv6].dst
IPtype = 1
else:
srcIP = ''
dstIP = ''
if packet.haslayer(TCP):
srcproto = str(packet[TCP].sport)
dstproto = str(packet[TCP].dport)
elif packet.haslayer(UDP):
srcproto = str(packet[UDP].sport)
dstproto = str(packet[UDP].dport)
else:
srcproto = ''
dstproto = ''
srcMAC = packet.src
dstMAC = packet.dst
if srcproto == '': # it's a L2/L1 level protocol
if packet.haslayer(ARP): # is ARP
srcproto = 'arp'
dstproto = 'arp'
srcIP = packet[ARP].psrc # src IP (ARP)
dstIP = packet[ARP].pdst # dst IP (ARP)
IPtype = 0
elif packet.haslayer(ICMP): # is ICMP
srcproto = 'icmp'
dstproto = 'icmp'
IPtype = 0
elif srcIP + srcproto + dstIP + dstproto == '': # some other protocol
srcIP = packet.src # src MAC
dstIP = packet.dst # dst MAC
else:
return []
self.curPacketIndx = self.curPacketIndx + 1
### Extract Features
try:
return self.nstat.updateGetStats(IPtype, srcMAC, dstMAC, srcIP, srcproto, dstIP, dstproto,
int(framelen),
float(timestamp))
except Exception as e:
print(e)
return []
def process_packet(self, packet):
packet = Ether(packet)
print("PACKET")
print(packet)
IPtype = np.nan
timestamp = packet.time
framelen = len(packet)
if packet.haslayer(IP): # IPv4
srcIP = packet[IP].src
dstIP = packet[IP].dst
IPtype = 0
elif packet.haslayer(IPv6): # ipv6
srcIP = packet[IPv6].src
dstIP = packet[IPv6].dst
IPtype = 1
else:
srcIP = ''
dstIP = ''
if packet.haslayer(TCP):
srcproto = str(packet[TCP].sport)
dstproto = str(packet[TCP].dport)
elif packet.haslayer(UDP):
srcproto = str(packet[UDP].sport)
dstproto = str(packet[UDP].dport)
else:
srcproto = ''
dstproto = ''
srcMAC = packet.src
dstMAC = packet.dst
if srcproto == '': # it's a L2/L1 level protocol
if packet.haslayer(ARP): # is ARP
srcproto = 'arp'
dstproto = 'arp'
srcIP = packet[ARP].psrc # src IP (ARP)
dstIP = packet[ARP].pdst # dst IP (ARP)
IPtype = 0
elif packet.haslayer(ICMP): # is ICMP
srcproto = 'icmp'
dstproto = 'icmp'
IPtype = 0
elif srcIP + srcproto + dstIP + dstproto == '': # some other protocol
srcIP = packet.src # src MAC
dstIP = packet.dst # dst MAC
def pcap2tsv_with_tshark(self):
print('Parsing with tshark...')
fields = "-e frame.time_epoch -e frame.len -e eth.src -e eth.dst -e ip.src -e ip.dst -e tcp.srcport -e tcp.dstport -e udp.srcport -e udp.dstport -e icmp.type -e icmp.code -e arp.opcode -e arp.src.hw_mac -e arp.src.proto_ipv4 -e arp.dst.hw_mac -e arp.dst.proto_ipv4 -e ipv6.src -e ipv6.dst"
cmd = '"' + self._tshark + '" -r '+ self.path +' -T fields '+ fields +' -E header=y -E occurrence=f > '+self.path+".tsv"
subprocess.call(cmd,shell=True)
print("tshark parsing complete. File saved as: "+self.path +".tsv")
def get_num_features(self):
return len(self.nstat.getNetStatHeaders())