260 lines
9.4 KiB
Python
Executable File
260 lines
9.4 KiB
Python
Executable File
from typing import List, Set
|
|
from netfilterqueue import NetfilterQueue
|
|
from scapy.all import IP, TCP, UDP
|
|
from subprocess import Popen, PIPE
|
|
import os, pcre2, traceback
|
|
from kthread import KThread
|
|
|
|
QUEUE_BASE_NUM = 1000
|
|
|
|
def bind_queues(func, len_list=1):
|
|
if len_list <= 0: raise Exception("len must be >= 1")
|
|
queue_list = []
|
|
starts = QUEUE_BASE_NUM
|
|
end = starts
|
|
|
|
def func_wrap(pkt):
|
|
pkt_parsed = IP(pkt.get_payload())
|
|
try:
|
|
if pkt_parsed[UDP if UDP in pkt_parsed else TCP].payload: func(pkt, pkt_parsed)
|
|
else: pkt.accept()
|
|
except Exception:
|
|
traceback.print_exc()
|
|
pkt.accept()
|
|
|
|
while True:
|
|
if starts >= 65536:
|
|
raise Exception("Netfilter queue is full!")
|
|
try:
|
|
for _ in range(len_list):
|
|
queue_list.append(NetfilterQueue())
|
|
queue_list[-1].bind(end, func_wrap)
|
|
end+=1
|
|
end-=1
|
|
break
|
|
except OSError:
|
|
del queue_list[-1]
|
|
for ele in queue_list:
|
|
ele.unbind()
|
|
queue_list = []
|
|
starts = end = end+1
|
|
return queue_list, (starts, end)
|
|
|
|
class FilterTypes:
|
|
INPUT = "FIREGEX-INPUT"
|
|
OUTPUT = "FIREGEX-OUTPUT"
|
|
|
|
class ProtoTypes:
|
|
TCP = "tcp"
|
|
UDP = "udp"
|
|
|
|
class IPTables:
|
|
|
|
@staticmethod
|
|
def command(params):
|
|
if os.geteuid() != 0:
|
|
exit("You need to have root privileges to run this script.\nPlease try again, this time using 'sudo'. Exiting.")
|
|
return Popen(["iptables"]+params, stdout=PIPE, stderr=PIPE).communicate()
|
|
|
|
@staticmethod
|
|
def list_filters(param):
|
|
stdout, strerr = IPTables.command(["-L", str(param), "--line-number", "-n"])
|
|
output = [ele.split() for ele in stdout.decode().split("\n")]
|
|
return [{
|
|
"id": ele[0],
|
|
"target": ele[1],
|
|
"prot": ele[2],
|
|
"opt": ele[3],
|
|
"source": ele[4],
|
|
"destination": ele[5],
|
|
"details": " ".join(ele[6:]) if len(ele) >= 7 else "",
|
|
} for ele in output if len(ele) >= 6 and ele[0].isnumeric()]
|
|
|
|
@staticmethod
|
|
def delete_command(param, id):
|
|
IPTables.command(["-R", str(param), str(id)])
|
|
|
|
@staticmethod
|
|
def create_chain(name):
|
|
IPTables.command(["-N", str(name)])
|
|
|
|
@staticmethod
|
|
def flush_chain(name):
|
|
IPTables.command(["-F", str(name)])
|
|
|
|
@staticmethod
|
|
def add_chain_to_input(name):
|
|
IPTables.command(["-I", "INPUT", "-j", str(name)])
|
|
|
|
@staticmethod
|
|
def add_chain_to_output(name):
|
|
IPTables.command(["-I", "OUTPUT", "-j", str(name)])
|
|
|
|
@staticmethod
|
|
def add_s_to_c(proto, port, queue_range):
|
|
init, end = queue_range
|
|
if init > end: init, end = end, init
|
|
IPTables.command([
|
|
"-A", FilterTypes.OUTPUT, "-p", str(proto),
|
|
"--sport", str(port), "-j", "NFQUEUE",
|
|
"--queue-num" if init == end else "--queue-balance",
|
|
f"{init}" if init == end else f"{init}:{end}", "--queue-bypass"
|
|
])
|
|
|
|
@staticmethod
|
|
def add_c_to_s(proto, port, queue_range):
|
|
init, end = queue_range
|
|
if init > end: init, end = end, init
|
|
IPTables.command([
|
|
"-A", FilterTypes.INPUT, "-p", str(proto),
|
|
"--dport", str(port), "-j", "NFQUEUE",
|
|
"--queue-num" if init == end else "--queue-balance",
|
|
f"{init}" if init == end else f"{init}:{end}", "--queue-bypass"
|
|
])
|
|
|
|
class FiregexFilter():
|
|
def __init__(self, type, number, queue, proto, port):
|
|
self.type = type
|
|
self.id = int(number)
|
|
self.queue = queue
|
|
self.proto = proto
|
|
self.port = int(port)
|
|
def __repr__(self) -> str:
|
|
return f"<FiregexFilter type={self.type} id={self.id} port={self.port} proto={self.proto} queue={self.queue}>"
|
|
|
|
def delete(self):
|
|
IPTables.delete_command(self.type, self.id)
|
|
|
|
class FiregexFilterManager:
|
|
|
|
def __init__(self):
|
|
IPTables.create_chain(FilterTypes.INPUT)
|
|
IPTables.create_chain(FilterTypes.OUTPUT)
|
|
input_found = False
|
|
output_found = False
|
|
for filter in IPTables.list_filters("INPUT"):
|
|
if filter["target"] == FilterTypes.INPUT:
|
|
input_found = True
|
|
break
|
|
for filter in IPTables.list_filters("OUTPUT"):
|
|
if filter["target"] == FilterTypes.OUTPUT:
|
|
output_found = True
|
|
break
|
|
if not input_found: IPTables.add_chain_to_input(FilterTypes.INPUT)
|
|
if not output_found: IPTables.add_chain_to_output(FilterTypes.OUTPUT)
|
|
|
|
|
|
def get(self) -> List[FiregexFilter]:
|
|
res = []
|
|
balanced_mode = pcre2.PCRE2(b"NFQUEUE balance ([0-9]+):([0-9]+)")
|
|
num_mode = pcre2.PCRE2(b"NFQUEUE num ([0-9]+)")
|
|
port_selected = pcre2.PCRE2(b"[sd]pt:([0-9]+)")
|
|
for filter_type in [FilterTypes.INPUT, FilterTypes.OUTPUT]:
|
|
for filter in IPTables.list_filters(filter_type):
|
|
queue_num = None
|
|
balanced = balanced_mode.search(filter["details"].encode())
|
|
numbered = num_mode.search(filter["details"].encode())
|
|
port = port_selected.search(filter["details"].encode())
|
|
if balanced: queue_num = (int(balanced.group(1).decode()), int(balanced.group(2).decode()))
|
|
if numbered: queue_num = (int(numbered.group(1).decode()), int(numbered.group(1).decode()))
|
|
if queue_num and port:
|
|
res.append(FiregexFilter(
|
|
type=filter_type,
|
|
number=filter["id"],
|
|
queue=queue_num,
|
|
proto=filter["prot"],
|
|
port=port.group(1).decode()
|
|
))
|
|
return res
|
|
|
|
def add(self, proto, port, func, n_threads = 1):
|
|
for ele in self.get():
|
|
if int(port) == ele.port: return None
|
|
|
|
def c_to_s(pkt, data): return func(pkt, data, True)
|
|
def s_to_c(pkt, data): return func(pkt, data, False)
|
|
|
|
queues_c_to_s, codes = bind_queues(c_to_s, n_threads)
|
|
IPTables.add_c_to_s(proto, port, codes)
|
|
queues_s_to_c, codes = bind_queues(s_to_c, n_threads)
|
|
IPTables.add_s_to_c(proto, port, codes)
|
|
return queues_c_to_s + queues_s_to_c
|
|
|
|
def delete_all(self):
|
|
for filter_type in [FilterTypes.INPUT, FilterTypes.OUTPUT]:
|
|
IPTables.flush_chain(filter_type)
|
|
|
|
def delete_by_port(self, port):
|
|
for filter in self.get():
|
|
if filter.port == int(port):
|
|
filter.delete()
|
|
|
|
class Filter:
|
|
def __init__(self, regex, is_case_sensitive=True, is_blacklist=True, c_to_s=False, s_to_c=False, blocked_packets=0, code=None):
|
|
self.regex = regex
|
|
self.is_case_sensitive = is_case_sensitive
|
|
self.is_blacklist = is_blacklist
|
|
if c_to_s == s_to_c: c_to_s = s_to_c = True # (False, False) == (True, True)
|
|
self.c_to_s = c_to_s
|
|
self.s_to_c = s_to_c
|
|
self.blocked = blocked_packets
|
|
self.code = code
|
|
self.compiled_regex = self.compile()
|
|
|
|
def compile(self):
|
|
if isinstance(self.regex, str): self.regex = self.regex.encode()
|
|
if not isinstance(self.regex, bytes): raise Exception("Invalid Regex Paramether")
|
|
return pcre2.PCRE2(self.regex if self.is_case_sensitive else b"(?i)"+self.regex)
|
|
|
|
def check(self, data):
|
|
return True if self.compiled_regex.search(data) else False
|
|
|
|
class Proxy:
|
|
def __init__(self, public_port = 0, callback_blocked_update=None, filters=None):
|
|
self.manager = FiregexFilterManager()
|
|
self.port = public_port
|
|
self.filters: Set[Filter] = set(filters) if filters else set([])
|
|
self.use_filters = True
|
|
self.callback_blocked_update = callback_blocked_update
|
|
self.threads = []
|
|
self.queue_list = []
|
|
|
|
def start(self):
|
|
self.manager.delete_by_port(self.port)
|
|
|
|
def regex_filter(pkt, data, by_client):
|
|
packet = bytes(data[TCP if TCP in data else UDP].payload)
|
|
try:
|
|
for filter in self.filters:
|
|
if (by_client and filter.c_to_s) or (not by_client and filter.s_to_c):
|
|
match = filter.check(packet)
|
|
if (filter.is_blacklist and match) or (not filter.is_blacklist and not match):
|
|
filter.blocked+=1
|
|
self.callback_blocked_update(filter)
|
|
pkt.drop()
|
|
return
|
|
except IndexError:
|
|
pass
|
|
pkt.accept()
|
|
|
|
self.queue_list = self.manager.add(ProtoTypes.TCP, self.port, regex_filter)
|
|
for ele in self.queue_list:
|
|
self.threads.append(KThread(target=ele.run))
|
|
self.threads[-1].daemon = True
|
|
self.threads[-1].start()
|
|
|
|
def stop(self):
|
|
self.manager.delete_by_port(self.port)
|
|
for ele in self.threads:
|
|
ele.kill()
|
|
if ele.is_alive():
|
|
print("Not killed succesffully") #TODO
|
|
self.threads = []
|
|
for ele in self.queue_list:
|
|
ele.unbind()
|
|
self.queue_list = []
|
|
|
|
|
|
def restart(self):
|
|
self.stop()
|
|
self.start() |