Refactoring code pt.1

2022-08-11 16:11:32 +02:00
parent 1931536516
commit f4fe3d3ab5
9 changed files with 354 additions and 73 deletions
--- a/backend/modules/porthijack/nftables.py
+++ b/backend/modules/porthijack/nftables.py
@@ -0,0 +1,95 @@
+from typing import List
+from utils import ip_parse, ip_family, NFTableManager
+
+class FiregexFilter():
+    def __init__(self, proto:str, port:int, ip_int:str, queue=None, target:str=None, id=None):
+        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(NFTableManager):
+    prerouting_porthijack = "prerouting_porthijack"
+    postrouting_porthijack = "postrouting_porthijack"
+    
+    def __init__(self):
+        super().__init__([
+            {"add":{"chain":{
+                "family":"inet",
+                "table":self.table_name,
+                "name":self.prerouting_porthijack,
+                "type":"filter",
+                "hook":"prerouting",
+                "prio":-300,
+                "policy":"accept"
+            }}},
+            {"add":{"chain":{
+                "family":"inet",
+                "table":self.table_name,
+                "name":self.postrouting_porthijack,
+                "type":"filter",
+                "hook":"postrouting",
+                "prio":-300,
+                "policy":"accept"
+            }}}
+        ],[
+            {"flush":{"chain":{"table":self.table_name,"family":"inet", "name":self.prerouting_porthijack}}},
+            {"delete":{"chain":{"table":self.table_name,"family":"inet", "name":self.prerouting_porthijack}}},
+            {"flush":{"chain":{"table":self.table_name,"family":"inet", "name":self.postrouting_porthijack}}},
+            {"delete":{"chain":{"table":self.table_name,"family":"inet", "name":self.postrouting_porthijack}}}
+        ])
+
+    def add(self, ip_int, proto, public_port, proxy_port):
+        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": self.prerouting_porthijack,
+            "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(public_port)}},
+                    {'mangle': {'key': {'payload': {'protocol': str(proto), 'field': 'dport'}}, 'value': int(proxy_port)}}
+                ]
+        }}})
+        self.cmd({ "insert":{ "rule": {
+            "family": "inet",
+            "table": self.table_name,
+            "chain": self.postrouting_porthijack,
+            "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(proxy_port)}},
+                    {'mangle': {'key': {'payload': {'protocol': str(proto), 'field': 'sport'}}, 'value': int(public_port)}}
+                ]
+        }}})
+
+    def get(self) -> List[FiregexFilter]:
+        res = []
+        for filter in self.list_rules(tables=[self.table_name], chains=[self.input_chain,self.output_chain]):
+            queue_str = filter["expr"][2]["queue"]["num"]
+            queue = None
+            if isinstance(queue_str,dict): queue = int(queue_str["range"][0]), int(queue_str["range"][1])
+            else: queue = int(queue_str), int(queue_str)
+            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
+