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System Security Hardening

Linux TCP Wrappers

Info

Linux TCP Wrappers is an open-source ACL (Access Control List) that aims at providing you with a way of restrict access to network services based on source IP or host addresses. This it does through two files /etc/hosts.allow and /etc/hosts.deny. It is meant to strengthen then security position of a server, and is intended to work in conjunction with other more robust firewalls in the system.

What you will learn

This scenario covers the following concepts, among others: - Denying all access to all network services - Restricting access to localhost - Resrticting access one or more services in a single rule - Restricting access to a range of hosts - Determining which services can be used with TCP wrappers, among others...

Scenario Pre-requisites

It is recommended, but not necessary to be familiar with the following concepts:

  • Basic Linux usage

However, it is still possible to follow the mission and complete the assessment by learning as you go.

Technical Details

This scenario contains one virtual machine.

  • MODESINGLEPLAYER
  • TYPECCL
  • DIFFICULTYEASY
  • TIME30 MINUTES
  • COST10 CRYSTALS
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