[Assignment-4] moved implementations into proxymodules folder

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

@@ -0,0 +1,30 @@
+import os.path as path
+import json
+import socket
+
+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["id"] == 2:
+            data_json["id"] = 3
+            data_json["sender"], data_json["receiver"] = data_json["receiver"], data_json["sender"]
+        elif data_json["id"] == 4:
+            data_json["id"] = 5
+            data_json["sender"], data_json["receiver"] = data_json["receiver"], data_json["sender"]
+            
+        data = bytes(json.dumps(data_json).replace(" ", "") + "\n", 'utf-8')
+        print(f"Outgoing data: {data}")
+        return data
+
+
+if __name__ == '__main__':
+    print('This module is not supposed to be executed alone!')

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

@@ -0,0 +1,37 @@
+import os.path as path
+import json
+import socket
+
+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["id"] == 1 and data_json["sender"] == "Bob":
+            # send own Nonce instead of N_B
+            data_json["content"] = '0'
+        elif data_json["id"] == 2 and data_json["sender"] == "Alice":
+            # start a parallel session with bob using Alice's Nonce N_A
+            data_json["id"] = 1
+            data_json["content"] = data_json["content"].split(',')[0]
+        elif data_json["id"] == 2 and data_json["sender"] == "Bob":
+            # Use Bob's signed answer to convince Alice, that we are Bob
+            data_json["id"] = 3
+        elif data_json["id"] == 3 and data_json["sender"] == "Alice":
+            # Drop communication with Bob
+            return bytes()
+        
+        data = bytes(json.dumps(data_json).replace(" ", "") + "\n", 'utf-8')
+        print(f"Outgoing data: {data}")
+        return data
+
+
+if __name__ == '__main__':
+    print('This module is not supposed to be executed alone!')