Update network configuration

dojo.yml

@@ -31,16 +31,15 @@ modules:
   - id: level-2
     name: Listen
   - id: level-3
-    name: Scan
+    name: Scan 1
   - id: level-4
     name: Scan 2
   - id: level-5
     name: Monitor 1
   - id: level-6
     name: Monitor 2
   - id: level-7
-    name: level7
-    description: Hijack traffic from a remote host by configuring your network interface
+    name: Network Configuration
   - id: level-8
     name: level8
     description: Manually send an Ethernet packet

intercepting-communication/level-5/DESCRIPTION.md

@@ -1,2 +1,2 @@
 Monitor traffic from a remote host.
-Your host is already receiving traffic on port `31337`.
+Your host is already receiving traffic on port `31337`.

intercepting-communication/level-6/DESCRIPTION.md

@@ -1,2 +1,2 @@
 Monitor slow traffic from a remote host.
-Your host is already receiving traffic on port `31337`.
+Your host is already receiving traffic on port `31337`.

intercepting-communication/level-7/.init

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

intercepting-communication/level-7/DESCRIPTION.md

@@ -0,0 +1,2 @@
+Hijack traffic from a remote host by configuring your network interface.
+The remote host at `10.0.0.2` is communicating with the remote host at `10.0.0.3` on port `31337`.

intercepting-communication/level-7/run

@@ -0,0 +1,50 @@
+#!/usr/bin/exec-suid --real -- /usr/bin/python -I
+
+import os
+import socket
+import subprocess
+import time
+from dojjail import Host, Network
+
+flag = open("/flag").read()
+
+class ClientHost(Host):
+    def entrypoint(self):
+        if os.fork() == 0:
+            while True:
+                subprocess.run(["/bin/ip", "neigh", "flush", "all"],
+                                check=True,
+                                stdin=subprocess.DEVNULL,
+                                stdout=subprocess.DEVNULL,
+                                stderr=subprocess.DEVNULL)
+                time.sleep(1)
+        while True:
+            try:
+                client_socket = socket.socket()
+                client_socket.connect(("10.0.0.3", 31337))
+                client_socket.sendall(flag.encode())
+                client_socket.close()
+                time.sleep(10)
+            except (ConnectionError, TimeoutError):
+                continue
+
+class ServerHost(Host):
+    def entrypoint(self):
+        server_socket = socket.socket()
+        server_socket.bind(("0.0.0.0", 31337))
+        server_socket.listen()
+        while True:
+            try:
+                connection, _ = server_socket.accept()
+                connection.recv(1024)
+                connection.close()
+            except ConnectionError:
+                continue
+
+user_host = Host("ip-10-0-0-1")
+client_host = ClientHost("ip-10-0-0-2")
+server_host = ServerHost("ip-10-0-0-3")
+network = Network(hosts={user_host: "10.0.0.1", client_host: "10.0.0.2", server_host: "10.0.0.3"}, subnet="10.0.0.0/24")
+network.run()
+
+user_host.interact()