How To Install libfko3 on Ubuntu 20.04
Introduction
In this tutorial we learn how to install libfko3 on Ubuntu 20.04.
What is libfko3
libfko3 is:
The FireWall KNock OPerator implements an authorization scheme called Single Packet Authorization (SPA), based on Netfilter and libpcap.
Its main application is to protect services such as OpenSSH with an additional layer of security in order to make the exploitation of vulnerabilities (both 0-day and unpatched code) much more difficult.
The authorization server passively listens for authorization packets via libpcap, so there is no service listening for network connections on the traditional port. Access to a protected service is only granted after a valid encrypted and non-replayed packet is detected.
This package provides the runtime library for fwknop (written inC).
There are three methods to install libfko3 on Ubuntu 20.04. We can use apt-get, apt and aptitude. In the following sections we will describe each method. You can choose one of them.
Install libfko3 Using apt-get
Update apt database with apt-get using the following command.
sudo apt-get update
After updating apt database, We can install libfko3 using apt-get by running the following command:
sudo apt-get -y install libfko3
Install libfko3 Using apt
Update apt database with apt using the following command.
sudo apt update
After updating apt database, We can install libfko3 using apt by running the following command:
sudo apt -y install libfko3
Install libfko3 Using aptitude
If you want to follow this method, you might need to install aptitude first since aptitude is usually not installed by default on Ubuntu. Update apt database with aptitude using the following command.
sudo aptitude update
After updating apt database, We can install libfko3 using aptitude by running the following command:
sudo aptitude -y install libfko3
How To Uninstall libfko3 on Ubuntu 20.04
To uninstall only the libfko3 package we can use the following command:
sudo apt-get remove libfko3
Uninstall libfko3 And Its Dependencies
To uninstall libfko3 and its dependencies that are no longer needed by Ubuntu 20.04, we can use the command below:
sudo apt-get -y autoremove libfko3
Remove libfko3 Configurations and Data
To remove libfko3 configuration and data from Ubuntu 20.04 we can use the following command:
sudo apt-get -y purge libfko3
Remove libfko3 configuration, data, and all of its dependencies
We can use the following command to remove libfko3 configurations, data and all of its dependencies, we can use the following command:
sudo apt-get -y autoremove --purge libfko3
References
Summary
In this tutorial we learn how to install libfko3 package on Ubuntu 20.04 using different package management tools: apt, apt-get and aptitude.
