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