ishan-saha / portblocker

A python script to hide the active ports from being discovered in a scan or even in case of the attacker using port knocking techniques

PortBlocker

To enhance the security of your nix device

This script basically creates iptable rules for blocking any incoming traffic/connection so that the applicaiton port is not discovered even by the means of port knocking. ‼️ Run this script with sudo!

In the script you have to change the local_address = xxx.xxx.xxx.xxx with the IP address that shows on your NAC or tunnel in case of a VPN.

To find the ip address of your device over a network you can simply use the ifconfig <adapter> | grep inet command by replacing the adapter with suitable value like en0.

The output will look something similar to the following:

inet6 fe80::106f:596b:b1e2:1579%en0 prefixlen 64 secured scopeid 0x4

inet 172.20.10.6 netmask 0xfffffff0 broadcast 172.20.10.15

inet6 2401:4900:b94:2576:43d:373a:8ece:90d2 prefixlen 64 autoconf secured

inet6 2401:4900:b94:2576:b08e:1faf:58bf:a9ba prefixlen 64 autoconf temporary

Usage

Find the IP address using the above mentioned process and then update the portblock.py and auth.py accordingly and keep the port 9090 open or change according to your need. Run the portblock.py wtih python 3.7 in the machine to protect and keep the broadcast.py in the same directory as it is required library. In the Aunthenticating machine install the necessary libraries with sudo pip3 install -r requirments.txt and simply run the auth.py in python 3.7 interpreter. Authenticate in GUI. Done! For non GUI simply use the file login.py and change the Server variable.

For Mac:

Start by running the srcipt after changes then open /etc/pf.conf using nano or vim and add the following line:

pass in proto udp from any to any port 9090

After that simply restart the pf service by running the following command:

sudo pfctl -f /etc/pf.conf

Future Changes:

• Ship for all linux version
• Add UDP listner
• Use Hashing for Auth
• Added GUI for client auth
• Ship for MacOS
• Add TLS on UDP
• API integration for Auth