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[Assignment-4] added comments in mitm and slke attack implementations

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This commit is contained in:
Sascha Tommasone 2024-05-27 12:54:09 +02:00
parent 10cb1766de
commit fd0d3d5f12
Signed by: saschato
GPG key ID: 751068A86FCAA217
2 changed files with 15 additions and 2 deletions
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9
Assignment 4 - Protokollsicherheit (Praxis)/proxy/proxymodules/mitm.py
View file

@ -4,7 +4,6 @@ import base64
import os.path as path
# protocol 1: flag{m4n_1n_th3_m1ddl3_w0w}
class Module:
def __init__(self, incoming=False, verbose=False, options=None):
# extract the file name from __file__. __file__ is proxymodules/name.py
@ -13,24 +12,32 @@ class Module:
self.incoming = incoming # incoming means module is on -im chain
self.find = None # if find is not None, this text will be highlighted
# protocol 1: flag{m4n_1n_th3_m1ddl3_w0w}
def execute(self, data):
print(f"Incoming data: {data}")
data_json = json.loads(data)
# return handshake messages without modification
if data_json.get("type") == "HANDSHAKE":
return data
# replace "Bob" with "Eve" in the first protocol message
elif data_json.get("id") == 1:
data_json["content"] = data_json["content"].replace("Bob","Eve")
# if message 3 received, build valid message 4
# instead of {Hello Alice!}_K use arbitary data
elif data_json.get("id") == 3:
data_json["id"] = 4
data_json["sender"] = "Bob"
data_json["receiver"] = "Alice"
data_json["content"] = str(base64.b64encode(os.urandom(16)))
# dump message
data = json.dumps(data_json) + "\n"
print(f"Outgoing data: {data}")
# return crafted message to proxy
return data

8
Assignment 4 - Protokollsicherheit (Praxis)/proxy/proxymodules/slke.py
View file

@ -3,7 +3,6 @@ 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
@ -12,22 +11,29 @@ class Module:
self.incoming = incoming # incoming means module is on -im chain
self.find = None # if find is not None, this text will be highlighted
# protocol 2: flag{n3v3r_tru5t_b0b}
def execute(self, data):
print(f"Incoming data: {data}")
data_json = json.loads(data)
# return handshake messages without modification
if data_json.get("type") == "HANDSHAKE":
return data
# swap receiver and sender of protocol messages with id 1,2 or 3
elif data_json.get("id") in {1, 2, 3}:
data_json["sender"], data_json["receiver"] = data_json["receiver"], data_json["sender"]
# if message 3 received from Alice, build valid message 4
if data_json.get("id") == 3:
data_json["id"] = 4
data_json["content"] = str(int(time.time()))
# dump message
data = json.dumps(data_json) + "\n"
print(f"Outgoing data: {data}")
# return crafted message to proxy
return data