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"""
TCP stream extraction using Scapy.
(c) Praetorian
Author: Adam Pridgen <adam.pridgen@praetorian.com> || <adam.pridgen@thecoverofnight.com>
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along
with this program; see the file COPYING. If not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
description: keeps track of the packets belonging to a specific tcp stream
"""
from scapy.all import *
from random import randint
import scapy
from random import randint
from TCPState import TCPStateMachine
from threading import *
HEADER = "Time Flow_with_Direction PktPayload ClientDataTransfered ServerDataTransfered TotalData TimeBetweenLastPkt TimeBetweenLastClientPacket TimeBetweenLastServerPacket TotalTimeElapsed"
MAX = 2 ** 32 - 1
FLOW_NAME = "T:%s_C:%s:%s_S:%s:%s"
class TCPStream:
def __init__(self, pkt ):
self.src = pkt["IP"].src
self.dst = pkt["IP"].dst
self.sport = pkt["TCP"].sport
self.dport = pkt["TCP"].dport
self.time = float(pkt.time)
self.tcp_state = TCPStateMachine(pkt)
self.flows = self.tcp_state.flows
self.pkts = {self.time:pkt}
self.ordered_pkts = None
self.last_time_written = 0.0
self.pcap_file = None
self.couchdb_file = None
self.flow_file = None
def len_pkts(self):
return len(list(self.pkts.keys()))
def destroy(self, pkts_cnt=0):
#self.ordered_pkts = None
keys = list(self.pkts.keys())
print(("destroying packets for %s"%self.get_stream_name()))
if pkts_cnt > 0:
keys = keys[:pkts_cnt]
print(("\t...Destroying the first %d pkts"%pkts_cnt))
if not self.ordered_pkts is None and len(self.ordered_pkts) >= pkts_cnt:
for i in self.ordered_pkts[:pkts_cnt]:
del i
self.ordered_pkts = None
for key in keys:
del self.pkts[key]
def get_stream_name(self):
global FLOW_NAME
return FLOW_NAME%(self.time, self.src, self.sport, self.dst, self.dport)
def get_stream_keys(self):
global HEADER
return HEADER.split()
def add_pkt(self, pkt):
is_closed = self.tcp_state.next_state(pkt)
self.pkts[float(pkt.time)] = pkt
self.last_time = pkt.time
return is_closed
def create_client_directed_flow(self):
return "%s:%s ==> %s:%s"%(self.src,str(self.sport),self.dst,str(self.dport))
def create_server_directed_flow(self):
return "%s:%s ==> %s:%s"%(self.dst,str(self.dport),self.src,str(self.sport),)
def get_client_server_str(self):
return "%s:%s ==> %s:%s"%(self.src,str(self.sport),self.dst,str(self.dport))
def get_server_client_str(self):
return "%s:%s <== %s:%s"%(self.dst,str(self.dport),self.src,str(self.sport))
def get_client_server(self):
return 0
def get_server_client(self):
return 1
def interp_direction(self, dir):
if dir == 0:
return get_client_server_str()
elif dir == 1:
return get_server_client_str()
raise Exception("Not a valid direction for the client server")
def get_order_pkts(self, pkts_cnt=0):
# caching mechanism
if self.ordered_pkts is None or len(self.ordered_pkts) != len(list(self.pkts.keys())):
times = list(self.pkts.keys())
times.sort()
self.ordered_pkts = [self.pkts[time] for time in times]
if pkts_cnt > 0:
return self.ordered_pkts[:pkts_cnt]
return self.ordered_pkts
def get_app_stream_summary(self, pkts_cnt=0):
global HEADER
pkts = self.get_order_pkts(pkts_cnt)
pkt_summary = []#[HEADER]
flow_total = 0
client_total = 0.0
server_total = 0.0
last_client_pkt = None
last_server_pkt = None
last_client_pkt_time = 0.0
last_server_pkt_time = 0.0
i = 0
while i < len(pkts):
pkt = pkts[i]
flow_info = ''
payload_len = len(pkt['TCP'].payload)
flow_total += payload_len
time_elapsed, time_last_pkt = self.packet_time_spacing_idx(pkts, i)
if self.src == pkt['IP'].src:
#flow_info = self.get_server_client_str()
flow_info = self.get_client_server()
if not last_client_pkt is None:
last_client_pkt_time = self.packet_time_spacing_pkt(pkt, last_client_pkt)
last_client_pkt = pkt
client_total += len(pkt['TCP'].payload)
else:
#flow_info = self.get_client_server_str()
flow_info = self.get_server_client()
if not last_server_pkt is None:
last_server_pkt_time = self.packet_time_spacing_pkt(pkt,last_server_pkt)
last_server_pkt = pkt
server_total += len(pkt['TCP'].payload)
pkt_summary.append([ str(pkt.time),
flow_info,
str(payload_len),
str(client_total),
str(server_total),
str(flow_total),
str(time_last_pkt),
str(last_client_pkt_time),
str(last_server_pkt_time),
str(time_elapsed)])
i+=1
return pkt_summary
def get_stream_summary(self, pkts_cnt=0):
pkts = self.get_order_pkts(pkts_cnt)
pkt_summary = []# [HEADER]
flow_total = 0
client_total = 0.0
server_total = 0.0
last_client_pkt = None
last_server_pkt = None
last_client_pkt_time = 0.0
last_server_pkt_time = 0.0
i = 0
while i < len(pkts):
pkt = pkts[i]
flow_info = ''
payload_len = len(pkt['TCP'])
flow_total += payload_len
time_elapsed, time_last_pkt = self.packet_time_spacing_idx(pkts, i)
if self.src == pkt['IP'].src:
flow_info = self.get_server_client_str()
if not last_client_pkt is None:
last_client_pkt_time = self.packet_time_spacing_pkt(pkt, last_client_pkt)
last_client_pkt = pkt
client_total += len(pkt['TCP'])
else:
flow_info = self.get_client_server_str()
if not last_server_pkt is None:
last_server_pkt_time = self.packet_time_spacing_pkt(pkt,last_server_pkt)
last_server_pkt = pkt
server_total += len(pkt['TCP'])
pkt_summary.append([ str(pkt.time),
flow_info,
str(payload_len),
str(client_total),
str(server_total),
str(flow_total),
str(time_last_pkt),
str(last_client_pkt_time),
str(last_server_pkt_time),
str(time_elapsed)])
i+=1
return pkt_summary
def get_ip_summary(self, pkts_cnt=0):
pkts = self.get_order_pkts(pkts_cnt)
pkt_summary = []# [HEADER]
flow_total = 0
client_total = 0
server_total = 0
last_client_pkt = None
last_server_pkt = None
last_client_pkt_time = 0.0
last_server_pkt_time = 0.0
i = 0
while i < len(pkts):
pkt = pkts[i]
flow_info = ''
payload_len = len(pkt['IP'])
flow_total += payload_len
time_elapsed, time_last_pkt = self.packet_time_spacing_idx(pkts, i)
if self.src == pkt['IP'].src:
flow_info = self.get_server_client_str()
if not last_client_pkt is None:
last_client_pkt_time = self.packet_time_spacing_pkt(pkt, last_client_pkt)
last_client_pkt = pkt
client_total += len(pkt['IP'])
else:
flow_info = self.get_client_server_str()
if not last_server_pkt is None:
last_server_pkt_time = self.packet_time_spacing_pkt(pkt,last_server_pkt)
last_server_pkt = pkt
server_total += len(pkt['IP'])
pkt_summary.append([ str(pkt.time),
flow_info,
str(payload_len),
str(client_total),
str(server_total),
str(flow_total),
str(time_last_pkt),
str(last_client_pkt_time),
str(last_server_pkt_time),
str(time_elapsed)])
i+=1
return pkt_summary
def packet_time_spacing_idx(self, pkts, idx):
if idx < 1: return 0.0, 0.0
return self.packet_time_spacing_pkt(pkts[idx], pkts[0]), self.packet_time_spacing_pkt(pkts[idx], pkts[idx-1])
def packet_time_spacing_pkt(self, pkt_a, pkt_b):
return pkt_a.time - pkt_b.time
def write_flow(self, filename, pkts_cnt=0):
if self.flow_file is None:
self.flow_file =open(filename+".app_flow", 'w')
flow_infos = []
flows = self.get_app_stream_summary(pkts_cnt)
for flow_info in flows:
flow_infos.append(" ".join([str(i) for i in flow_info]))
self.flow_file.write("\n".join(flow_infos)+"\n")
self.flow_file.flush()
def write_pcap(self, filename, pkts_cnt=0):
if self.pcap_file is None:
self.pcap_file = scapy.utils.PcapWriter(filename+".pcap")
pkts = self.get_order_pkts(pkts_cnt)
self.pcap_file.write(pkts)
self.pcap_file.flush()
def organize_streams(self):
data = {}
seq_nos = {}
for pkt in self.get_order_pkts():
tcpp = pkt[TCP]
seq = tcpp.seq
sport = tcpp.sport
if not sport in data:
data[sport] = []
seq_nos[sport] = []
if seq in seq_nos[sport]:
# retransmit
continue
if Raw in tcpp:
data[sport].append([tcpp.seq, tcpp[Raw].load])
seq_nos[sport].append(seq)
return seq_nos, data
def get_stream_data(self):
seq_nos, data = self.organize_streams()
streams = {k:bytes() for k in data.keys()}
for sport, seqs_payloads in data.items():
stream = b''
for seq, payload in seqs_payloads:
stream = stream + payload
streams[sport] = stream
return streams
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