Moduled Firegex, Merging pt1 (not finished and not working yet)

backend/utils/firegextables.py

@@ -0,0 +1,125 @@
+from typing import List
+import nftables
+from utils import ip_parse, ip_family
+
+class FiregexFilter():
+    def __init__(self, proto:str, port:int, ip_int:str, queue=None, target:str=None, id=None):
+        self.nftables = nftables.Nftables()
+        self.id = int(id) if id else None
+        self.queue = queue
+        self.target = target
+        self.proto = proto
+        self.port = int(port)
+        self.ip_int = str(ip_int)
+
+    def __eq__(self, o: object) -> bool:
+        if isinstance(o, FiregexFilter):
+            return self.port == o.port and self.proto == o.proto and ip_parse(self.ip_int) == ip_parse(o.ip_int)
+        return False
+
+class FiregexTables:
+
+    def __init__(self):
+        self.table_name = "firegex"
+        self.nft = nftables.Nftables()
+    
+    def raw_cmd(self, *cmds):
+        return self.nft.json_cmd({"nftables": list(cmds)})
+
+    def cmd(self, *cmds):
+        code, out, err = self.raw_cmd(*cmds)
+
+        if code == 0: return out
+        else: raise Exception(err)
+    
+    def init(self):
+        self.reset()
+        code, out, err = self.raw_cmd({"create":{"table":{"name":self.table_name,"family":"inet"}}})
+        if code == 0:
+            self.cmd(
+                {"create":{"chain":{
+                    "family":"inet",
+                    "table":self.table_name,
+                    "name":"input",
+                    "type":"filter",
+                    "hook":"prerouting",
+                    "prio":-150,
+                    "policy":"accept"
+                }}},
+                {"create":{"chain":{
+                    "family":"inet",
+                    "table":self.table_name,
+                    "name":"output",
+                    "type":"filter",
+                    "hook":"postrouting",
+                    "prio":-150,
+                    "policy":"accept"
+                }}}
+            )
+        
+            
+    def reset(self):
+        self.raw_cmd(
+            {"flush":{"table":{"name":"firegex","family":"inet"}}},
+            {"delete":{"table":{"name":"firegex","family":"inet"}}},
+        )
+
+    def list(self):
+        return self.cmd({"list": {"ruleset": None}})["nftables"]
+
+    def add_output(self, queue_range, proto, port, ip_int):
+        init, end = queue_range
+        if init > end: init, end = end, init
+        ip_int = ip_parse(ip_int)
+        ip_addr = str(ip_int).split("/")[0]
+        ip_addr_cidr = int(str(ip_int).split("/")[1])
+        self.cmd({ "insert":{ "rule": {
+            "family": "inet",
+            "table": self.table_name,
+            "chain": "output",
+            "expr": [
+                    {'match': {'left': {'payload': {'protocol': ip_family(ip_int), 'field': 'saddr'}}, 'op': '==', 'right': {"prefix": {"addr": ip_addr, "len": ip_addr_cidr}}}},
+                    {'match': {"left": { "payload": {"protocol": str(proto), "field": "sport"}}, "op": "==", "right": int(port)}},
+                    {"queue": {"num": str(init) if init == end else f"{init}-{end}", "flags": ["bypass"]}}
+                ]
+        }}})
+
+    def add_input(self, queue_range, proto = None, port = None, ip_int = None):
+        init, end = queue_range
+        if init > end: init, end = end, init
+        ip_int = ip_parse(ip_int)
+        ip_addr = str(ip_int).split("/")[0]
+        ip_addr_cidr = int(str(ip_int).split("/")[1])
+        self.cmd({"insert":{"rule":{
+            "family": "inet",
+            "table": self.table_name,
+            "chain": "input",
+            "expr": [
+                    {'match': {'left': {'payload': {'protocol': ip_family(ip_int), 'field': 'daddr'}}, 'op': '==', 'right': {"prefix": {"addr": ip_addr, "len": ip_addr_cidr}}}},
+                    {'match': {"left": { "payload": {"protocol": str(proto), "field": "dport"}}, "op": "==", "right": int(port)}},
+                    {"queue": {"num": str(init) if init == end else f"{init}-{end}", "flags": ["bypass"]}}
+                ]
+        }}})
+
+    def get(self) -> List[FiregexFilter]:
+        res = []
+        for filter in [ele["rule"] for ele in self.list() if "rule" in ele and ele["rule"]["table"] == self.table_name]:
+            queue_str = str(filter["expr"][2]["queue"]["num"]).split("-")
+            queue = None
+            if len(queue_str) == 1: queue = int(queue_str[0]), int(queue_str[0])
+            else: queue = int(queue_str[0]), int(queue_str[1])
+            ip_int = None
+            if isinstance(filter["expr"][0]["match"]["right"],str):
+                ip_int = str(ip_parse(filter["expr"][0]["match"]["right"]))
+            else:
+                ip_int = f'{filter["expr"][0]["match"]["right"]["prefix"]["addr"]}/{filter["expr"][0]["match"]["right"]["prefix"]["len"]}'
+            res.append(FiregexFilter(
+                target=filter["chain"],
+                id=int(filter["handle"]),
+                queue=queue,
+                proto=filter["expr"][1]["match"]["left"]["payload"]["protocol"],
+                port=filter["expr"][1]["match"]["right"],
+                ip_int=ip_int
+            ))
+        return res
+