I recently wrote a nice little program to setup and maintain your firewall on Ubuntu GNU/Linux 14.04. This will install a cron job to run daily and pull lists from multiple sites to block malicious IP addresses. Adding around ~40,000 or more individual IP addresses as well as the top 20 malicious IP blocks per day, all voluntarily and freely contributed. All of the malicious individual addresses are managed with ipset, while the IP blocks are managed with IPTables. This leads to a very efficient way of managing the tables easily and automatically. This optionally allows you to enable or disable Tor Exit node connections. I have also created an optional weekly cron job that will block whatever countries you may wish. I hand typed all 233 countries codes into a dialog menu. I added a new iptables-persistent from another Github repository which also works with ipsets to keep it persistent upon reboot for both iptables.
The lists that are regularly installed:
Project Honey Pot Directory of Dictionary Attacker IPs
TOR Exit Nodes this will block all access to Tor*
Malware Domain List
Malc0de IP blacklist
MaxMind GeoIP Anonymous Proxies
It’s simple enough to install. Simply run the script as root and select if you want to block Tor exit nodes or if you want to block any countries. If there are any issues or suggestions please let me know on GitHub. I want to eventually make this also capable of running on CentOS for my PhonePBX.
Tested on Ubuntu 14.04 servers, and Xubuntu 14.04 running server applications. Test it on your own machine as well if you like