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live_sniffer.py
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live_sniffer.py
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import codecs
import datetime
from multiprocessing import Queue
import joblib
import numpy as np
import polars as pl
from scapy.all import *
from scapy.layers.dns import DNS, DNSQR
from scapy.layers.inet import IP
from scapy.layers.inet6 import IPv6
from utils import shannon_entropy
class Sniffer(Thread):
"""Producer"""
def __init__(self, que):
super().__init__()
self.que = que
def run(self):
while True:
sniff(prn=self.que.put, iface="eno1", filter="udp and port 53")
class Consumer(Thread):
"""Consumer"""
def __init__(self, que_data: Queue, que_validator: Queue):
super().__init__()
self.que = que_data
self.que_validator = que_validator
self.data = []
def run(self):
while True:
packet = self.que.get()
if (
packet.haslayer(DNSQR)
and (
packet[DNSQR].qtype == 1
or packet[DNSQR].qtype == 28
or packet[DNSQR].qtype == 5
or packet[DNSQR].qtype == 16
or packet[DNSQR].qtype == 10
)
and packet.dport == 53
):
time = datetime.utcfromtimestamp(float(packet.time))
query = codecs.decode(packet[DNSQR].qname, encoding="latin-1")
src_ip, dst_ip = "", ""
if IP in packet:
src_ip = packet[IP].src
dst_ip = packet[IP].dst
elif IPv6 in packet:
src_ip = packet[IPv6].src
dst_ip = packet[IPv6].dst
packet_size = len(packet[DNS])
entropy = shannon_entropy(query)
# Create dict object
p = dict()
p["timestamp"] = time
p["src_ip"] = src_ip
p["dst_ip"] = dst_ip
p["entropy"] = entropy
p["packet_size"] = packet_size
p["query"] = query
self.que_validator.put(p)
class Validator(Thread):
"""Consumer"""
def __init__(self, que: Queue, model_path: str = "./dtwknn.pickle"):
super().__init__()
self.que: Queue = que
self.data = []
self.channels = []
self.model = joblib.load(model_path)
def run(self):
while True:
self.channels.append(self.que.get())
if len(self.channels) > 1:
df_total = pl.DataFrame(self.channels)
df = (
df_total.sort("timestamp")
.group_by_dynamic(
"timestamp", every="2s", closed="right", by=["src_ip", "dst_ip"]
)
.agg(pl.col("entropy").mean(), pl.col("packet_size").mean())
)
min_date = df.select(["timestamp"]).min().item()
max_date = df.select(["timestamp"]).max().item()
# We generate empty datetime with zero values in a time range of 6h
datetimes = df.select(
pl.datetime_range(
min_date.replace(microsecond=0),
max_date.replace(microsecond=0),
"1s",
time_unit="us",
).alias("timestamp")
)
ids = df.select(["src_ip", "dst_ip"]).unique()
# Cross joining all domain
all_dates = datetimes.join(ids, how="cross")
# Fill with null
x = all_dates.join(
df, how="left", on=["src_ip", "dst_ip", "timestamp"]
).fill_null(0)
x_column = x.group_by(["src_ip", "dst_ip"]).agg(pl.col("entropy"))
unique_ips = x_column.select(["src_ip", "dst_ip"]).unique()
for row in unique_ips.rows(named=True):
data = x_column.filter(pl.col("src_ip") == row["src_ip"])
data_entropy = data.select("entropy").rows(named=True)[0]["entropy"]
# Time interval 5 sec.
if len(data_entropy) > 4:
result = self.model.predict(np.asarray(data_entropy[:5]))
if result[0] == 2:
print(f"Prediction for data: {result}")
print(
f"Suspicious Data: {df_total.filter(pl.col('src_ip') == row['src_ip']).sort('timestamp')}"
)
# self.data.append(data)
# y = np.full((len(self.data), 1), 1)
# np.save(f"dtw_data_npy/x_live_1min_entropy.npy", self.data)
# np.save(f"dtw_data_npy/y_live_1min_entropy.npy", y)
# Clear channels
self.channels = []
def main():
que_data = Queue()
que_validate = Queue()
sniffer = Sniffer(que_data)
consumer = Consumer(que_data, que_validate)
validator = Validator(que_validate)
sniffer.start()
consumer.start()
validator.start()
if __name__ == "__main__":
main()