udp1

intercepting-communication/module.yml

@@ -29,6 +29,10 @@ challenges:
   name: TCP
 - id: level-11
   name: TCP Handshake
+- id: udp-1
+  name: UDP
+  visibility:
+    start: "2029-11-04T13:00:00-07:00"
 - id: level-12
   name: ARP
 - id: level-13

intercepting-communication/sniff-cookie/run

@@ -3,7 +3,6 @@
 import requests
 import random
 import psutil
-import socket
 import string
 import flask
 import time

intercepting-communication/udp-1/.init

@@ -0,0 +1 @@
+../.init

intercepting-communication/udp-1/DESCRIPTION.md

@@ -0,0 +1 @@
+You've used TCP, 

intercepting-communication/udp-1/run

@@ -0,0 +1,33 @@
+#!/usr/bin/exec-suid --real -- /usr/bin/python -I
+
+import psutil
+import socket
+import os
+
+from dojjail import Host, Network
+
+flag = open("/flag").read()
+parent_process = psutil.Process(os.getppid())
+
+class ServerHost(Host):
+    def entrypoint(self):
+        server_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+        server_socket.bind(("0.0.0.0", 31337))
+        while True:
+            try:
+                client_message, (client_host, client_port) = server_socket.recvfrom(1024)
+                while True:
+                    if not client_message:
+                        break
+                    if client_message == "Hello, World!\n":
+                        server_socket.sendto(flag.encode(), (client_host, client_port))
+                        break
+            except ConnectionError:
+                continue
+
+user_host = Host("ip-10-0-0-1", privileged_uid=parent_process.uids().effective)
+server_host = ServerHost("ip-10-0-0-2")
+network = Network(hosts={user_host: "10.0.0.1", server_host: "10.0.0.2"}, subnet="10.0.0.0/24")
+network.run()
+
+user_host.interactive(environ=parent_process.environ())