133 lines
4.9 KiB
Python
133 lines
4.9 KiB
Python
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from ipaddress import ip_interface
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import nftables, traceback
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def ip_parse(ip:str):
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return str(ip_interface(ip).network)
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def ip_family(ip:str):
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return "ip6" if ip_interface(ip).version == 6 else "ip"
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class Singleton(object):
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__instance = None
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def __new__(class_, *args, **kwargs):
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if not isinstance(class_.__instance, class_):
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class_.__instance = object.__new__(class_, *args, **kwargs)
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return class_.__instance
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class NFTableManager(Singleton):
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table_name = "firegex"
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def __init__(self, init_cmd, reset_cmd):
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self.__init_cmds = init_cmd
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self.__reset_cmds = reset_cmd
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self.nft = nftables.Nftables()
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def raw_cmd(self, *cmds):
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return self.nft.json_cmd({"nftables": list(cmds)})
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def cmd(self, *cmds):
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code, out, err = self.raw_cmd(*cmds)
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if code == 0: return out
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else: raise Exception(err)
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def init(self):
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self.reset()
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self.raw_cmd({"add":{"table":{"name":self.table_name,"family":"inet"}}})
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self.cmd(*self.__init_cmds)
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def reset(self):
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self.raw_cmd(*self.__reset_cmds)
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def list(self):
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return self.cmd({"list": {"ruleset": None}})["nftables"]
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class FiregexTables(NFTableManager):
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prerouting_porthijack = "porthijack"
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def __init__(self):
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super().__init__([
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{"add":{"chain":{
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"family":"inet",
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"table":self.table_name,
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"name":self.prerouting_porthijack,
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"type":"nat",
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"hook":"output",
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"prio":-100,
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"policy":"accept"
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}}}
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],[
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{"flush":{"chain":{"table":self.table_name,"family":"inet", "name":self.prerouting_porthijack}}},
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{"delete":{"chain":{"table":self.table_name,"family":"inet", "name":self.prerouting_porthijack}}}
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])
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def add(self, ip_int, proto, public_port, proxy_port):
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ip_int = ip_parse(ip_int)
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ip_addr = str(ip_int).split("/")[0]
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ip_addr_cidr = int(str(ip_int).split("/")[1])
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self.cmd({ "insert":{ "rule": {
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"family": "inet",
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"table": self.table_name,
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"chain": self.prerouting_porthijack,
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"expr": [
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{'match': {'left': {'payload': {'protocol': ip_family(ip_int), 'field': 'daddr'}}, 'op': '==', 'right': {"prefix": {"addr": ip_addr, "len": ip_addr_cidr}}}},
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{'match': {'left': { "payload": {"protocol": str(proto), "field": "dport"}}, "op": "==", "right": int(public_port)}},
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{'redirect' : {'port' : int(proxy_port), 'flags' : []}}
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]
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}}})
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"""
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def add_output(self, queue_range, proto, port, ip_int):
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def add_input(self, queue_range, proto = None, port = None, ip_int = None):
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init, end = queue_range
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if init > end: init, end = end, init
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ip_int = ip_parse(ip_int)
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ip_addr = str(ip_int).split("/")[0]
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ip_addr_cidr = int(str(ip_int).split("/")[1])
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self.cmd({"insert":{"rule":{
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"family": "inet",
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"table": self.table_name,
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"chain": self.input_chain,
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"expr": [
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{'match': {'left': {'payload': {'protocol': ip_family(ip_int), 'field': 'daddr'}}, 'op': '==', 'right': {"prefix": {"addr": ip_addr, "len": ip_addr_cidr}}}},
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{'match': {"left": { "payload": {"protocol": str(proto), "field": "dport"}}, "op": "==", "right": int(port)}},
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{"queue": {"num": str(init) if init == end else {"range":[init, end] }, "flags": ["bypass"]}}
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]
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}}})
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def get(self) -> List[FiregexFilter]:
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res = []
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for filter in [ele["rule"] for ele in self.list() if "rule" in ele and ele["rule"]["table"] == self.table_name]:
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queue_str = filter["expr"][2]["queue"]["num"]
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queue = None
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if isinstance(queue_str,dict): queue = int(queue_str["range"][0]), int(queue_str["range"][1])
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else: queue = int(queue_str), int(queue_str)
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ip_int = None
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if isinstance(filter["expr"][0]["match"]["right"],str):
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ip_int = str(ip_parse(filter["expr"][0]["match"]["right"]))
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else:
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ip_int = f'{filter["expr"][0]["match"]["right"]["prefix"]["addr"]}/{filter["expr"][0]["match"]["right"]["prefix"]["len"]}'
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res.append(FiregexFilter(
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target=filter["chain"],
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id=int(filter["handle"]),
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queue=queue,
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proto=filter["expr"][1]["match"]["left"]["payload"]["protocol"],
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port=filter["expr"][1]["match"]["right"],
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ip_int=ip_int
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))
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return res
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"""
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try:
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#print(FiregexTables().list())
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FiregexTables().init()
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FiregexTables().add("127.0.0.1","tcp", 8080, 8081)
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input()
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except:
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traceback.print_exc()
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FiregexTables().reset()
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#https://www.mankier.com/5/libnftables-json |