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

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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
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# protocol 4: flag{4uth3nt1c4t10n_1s_1mp0rt4nt}
def execute(self, data):
print(f"Incoming data: {data}")
data_json = json.loads(data)
if data_json["id"] == 2:
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# Send Nonce N_S back to S without Alice encrypting it
data_json["id"] = 3
data_json["sender"], data_json["receiver"] = data_json["receiver"], data_json["sender"]
elif data_json["id"] == 4:
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# Reflect message back to S so that T does not decrypt it
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!')