From aba24b087ade780f00f0683da5c8cec150aa5437 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20Gro=C3=9F?= <kontakt@minzkraut.com>
Date: Sun, 8 Jul 2018 19:06:10 -0400
Subject: [PATCH] Importing Basically Gambling challenge

---
 basically gambling/README.md           |  3 ++
 basically gambling/challenge_server.py | 62 ++++++++++++++++++++++++++
 basically gambling/getflag_b46.sh      | 14 ++++++
 3 files changed, 79 insertions(+)
 create mode 100644 basically gambling/README.md
 create mode 100755 basically gambling/challenge_server.py
 create mode 100755 basically gambling/getflag_b46.sh

diff --git a/basically gambling/README.md b/basically gambling/README.md
new file mode 100644
index 0000000..dc01ce1
--- /dev/null
+++ b/basically gambling/README.md	
@@ -0,0 +1,3 @@
+# Lucky number 64
+
+
diff --git a/basically gambling/challenge_server.py b/basically gambling/challenge_server.py
new file mode 100755
index 0000000..f204a54
--- /dev/null
+++ b/basically gambling/challenge_server.py	
@@ -0,0 +1,62 @@
+#!/usr/bin/env python
+import threading, time, socket, sys, random
+import SocketServer
+from base64 import b64encode
+
+flag       = "MNZ{64IsTheBestBase==}"
+notTheFlag = "Better luck next time!"
+CHUNKS     = 20
+CHANCE     = 0.15
+PORT       = 6646
+class ThreadedTCPRequestHandler(SocketServer.BaseRequestHandler):
+    def setup(self):
+        print("Connected TO {}".format(self.client_address))
+        try:
+            fh = open("/dev/urandom","rb")
+            chunk = random.randint(1, CHUNKS)
+            for i in range(0, CHUNKS):
+                output = b64encode(fh.read(22))
+                self.request.sendall("{}\n".format(output))
+                if i == chunk:
+                    rand = random.random()
+                    output = flag if rand < CHANCE else notTheFlag
+                    print output
+                    output = b64encode(output)
+                    self.request.sendall("{}\n".format(output))
+                time.sleep(0.1)
+        except socket.error as e:
+            print "Socket error {} - {}".format(e.errno, self.client_address)
+        finally:
+            fh.close()
+    def handle(self):
+       pass 
+    def finish(self):
+        print "Closed connection to {}".format(self.client_address)
+
+class ThreadedTCPServer(SocketServer.ThreadingMixIn, SocketServer.TCPServer):
+    pass
+
+if __name__ == "__main__":
+    HOST = "0.0.0.0"
+
+    server = ThreadedTCPServer((HOST, PORT), ThreadedTCPRequestHandler)
+    ip, port = server.server_address
+
+    # Start a thread with the server -- that thread will then start one
+    # more thread for each request
+    server_thread = threading.Thread(target=server.serve_forever)
+    # Exit the server thread when the main thread terminates
+    server_thread.daemon = True
+    server_thread.start()
+    print "Server loop running in thread:", server_thread.name
+    #server.shutdown()
+    #server.server_close()
+    while ( True ):
+        server.handle_request()
+        try:    
+            server.get_request()
+        except KeyboardInterrupt:
+	    print "Server Stopping"
+            server.shutdown()
+            server.server_close()
+            break
diff --git a/basically gambling/getflag_b46.sh b/basically gambling/getflag_b46.sh
new file mode 100755
index 0000000..ef4d4ef
--- /dev/null
+++ b/basically gambling/getflag_b46.sh	
@@ -0,0 +1,14 @@
+#!/bin/bash
+echo "Attempting to get flag..."
+ATTEMPT=1
+while :;
+do
+    echo "Attempt ${ATTEMPT}..."
+    ATTEMPT=$[ATTEMPT + 1]
+    RESULT=$(nc localhost 6667 | base64 -d | strings | grep "MNZ{")
+    if [[ $RESULT ]]; then
+        echo "Found the flag"
+        echo $RESULT
+        break
+    fi
+done