[Assignment-4] added slke attack implementation

Assignment 4 - Protokollsicherheit (Praxis)/proxy/proxymodules/slke.py

@@ -0,0 +1,35 @@
+import json
+import time
+import os.path as path
+
+
+# protocol 2: flag{n3v3r_tru5t_b0b}
+class Module:
+    def __init__(self, incoming=False, verbose=False, options=None):
+        # extract the file name from __file__. __file__ is proxymodules/name.py
+        self.name = path.splitext(path.basename(__file__))[0]
+        self.description = 'Simply print the received data as text'
+        self.incoming = incoming  # incoming means module is on -im chain
+        self.find = None  # if find is not None, this text will be highlighted
+
+    def execute(self, data):
+        print(f"Incoming data: {data}")
+        data_json = json.loads(data)
+        
+        if data_json.get("type") == "HANDSHAKE":
+            return data
+        
+        elif data_json.get("id") in {1, 2, 3}:
+            data_json["sender"], data_json["receiver"] = data_json["receiver"], data_json["sender"]
+
+        if data_json.get("id") == 3:
+            data_json["id"] = 4
+            data_json["content"] = str(int(time.time()))
+
+        data = json.dumps(data_json) + "\n"
+        print(f"Outgoing data: {data}")
+        return data
+
+
+if __name__ == '__main__':
+    print('This module is not supposed to be executed alone!')