137 lines
5.3 KiB
Python
137 lines
5.3 KiB
Python
from modules.nfproxy.nftables import FiregexTables
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from utils import run_func
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from modules.nfproxy.models import Service, PyFilter
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import os
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import asyncio
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from utils import DEBUG
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import traceback
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from fastapi import HTTPException
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nft = FiregexTables()
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class FiregexInterceptor:
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def __init__(self):
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self.srv:Service
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self._stats_updater_cb:callable
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self.filter_map_lock:asyncio.Lock
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self.filter_map: dict[str, PyFilter]
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self.pyfilters: set[PyFilter]
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self.update_config_lock:asyncio.Lock
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self.process:asyncio.subprocess.Process
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self.update_task: asyncio.Task
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self.ack_arrived = False
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self.ack_status = None
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self.ack_fail_what = "Unknown"
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self.ack_lock = asyncio.Lock()
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async def _call_stats_updater_callback(self, filter: PyFilter):
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if self._stats_updater_cb:
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await run_func(self._stats_updater_cb(filter))
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@classmethod
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async def start(cls, srv: Service, stats_updater_cb:callable):
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self = cls()
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self._stats_updater_cb = stats_updater_cb
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self.srv = srv
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self.filter_map_lock = asyncio.Lock()
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self.update_config_lock = asyncio.Lock()
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queue_range = await self._start_binary()
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self.update_task = asyncio.create_task(self.update_stats())
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nft.add(self.srv, queue_range)
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if not self.ack_lock.locked():
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await self.ack_lock.acquire()
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return self
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async def _start_binary(self):
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proxy_binary_path = os.path.join(os.path.dirname(os.path.abspath(__file__)),"../cpproxy")
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self.process = await asyncio.create_subprocess_exec(
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proxy_binary_path,
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stdout=asyncio.subprocess.PIPE, stdin=asyncio.subprocess.PIPE,
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env={
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"NTHREADS": os.getenv("NTHREADS","1"),
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"FIREGEX_NFQUEUE_FAIL_OPEN": "1" if self.srv.fail_open else "0",
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},
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)
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line_fut = self.process.stdout.readuntil()
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try:
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line_fut = await asyncio.wait_for(line_fut, timeout=3)
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except asyncio.TimeoutError:
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self.process.kill()
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raise Exception("Invalid binary output")
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line = line_fut.decode()
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if line.startswith("QUEUE "):
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params = line.split()
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return (int(params[1]), int(params[1]))
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else:
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self.process.kill()
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raise Exception("Invalid binary output")
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async def update_stats(self):
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try:
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while True:
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line = (await self.process.stdout.readuntil()).decode()
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if DEBUG:
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print(line)
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if line.startswith("BLOCKED "):
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filter_id = line.split()[1]
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async with self.filter_map_lock:
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if filter_id in self.filter_map:
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self.filter_map[filter_id].blocked_packets+=1
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await self.filter_map[filter_id].update()
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if line.startswith("MANGLED "):
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filter_id = line.split()[1]
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async with self.filter_map_lock:
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if filter_id in self.filter_map:
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self.filter_map[filter_id].edited_packets+=1
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await self.filter_map[filter_id].update()
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if line.startswith("EXCEPTION"):
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print("TODO EXCEPTION HANDLING") # TODO
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if line.startswith("ACK "):
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self.ack_arrived = True
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self.ack_status = line.split()[1].upper() == "OK"
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if not self.ack_status:
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self.ack_fail_what = " ".join(line.split()[2:])
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self.ack_lock.release()
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except asyncio.CancelledError:
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pass
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except asyncio.IncompleteReadError:
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pass
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except Exception:
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traceback.print_exc()
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async def stop(self):
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self.update_task.cancel()
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if self.process and self.process.returncode is None:
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self.process.kill()
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async def _update_config(self, code):
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async with self.update_config_lock:
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self.process.stdin.write(len(code).to_bytes(4, byteorder='big')+code.encode())
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await self.process.stdin.drain()
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try:
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async with asyncio.timeout(3):
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await self.ack_lock.acquire()
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except TimeoutError:
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pass
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if not self.ack_arrived or not self.ack_status:
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await self.stop()
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raise HTTPException(status_code=500, detail=f"NFQ error: {self.ack_fail_what}")
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async def reload(self, filters:list[PyFilter]):
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async with self.filter_map_lock:
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if os.path.exists(f"db/nfproxy_filters/{self.srv.id}.py"):
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with open(f"db/nfproxy_filters/{self.srv.id}.py") as f:
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filter_file = f.read()
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else:
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filter_file = ""
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await self._update_config(
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"global __firegex_pyfilter_enabled\n" +
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"__firegex_pyfilter_enabled = [" + ", ".join([repr(f.name) for f in filters]) + "]\n" +
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"__firegex_proto = " + repr(self.srv.proto) + "\n" +
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"import firegex.nfproxy.internals\n\n" +
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filter_file + "\n\n" +
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"firegex.nfproxy.internals.compile()"
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)
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