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How to install PSAD Intrusion Detection on Ubuntu 16.04 LTS server

5 maart 2021 in
Administrator

This guide is intended as a relatively easy step by step guide to:

  • Install CipherDyne PSAD Intrusion Detection and Log Analysis with iptables on Ubuntu 12.04 LTS or later.
  • psad is a collection of three lightweight system daemons that run on Linux machines and analyze iptables log messages to detect port scans and other suspicious traffic.
  • From version 2.2 it also offers full IPv6 support.

Requirements:

  • Tested on Ubuntu 12.04 LTS – 16.04 LTS server.
  • Should work on most Ubuntu/Debian based ditro’s.

1. Download and install the latest version of PSAD.

  • Download and install the latest version from the Cipherdyne website.
  • Visit the CipherDyne PSAD download page and select the latest source tar archive, as of writing this the latest version isPSAD 2.4.3
  • To download and install the latest version open a Terminal and enter the following :
sudo su
mkdir /tmp/.psad
cd /tmp/.psad
wget http://cipherdyne.org/psad/download/psad-2.4.3.tar.gz
tar -zxvf psad-2.4.3.tar.gz
cd psad-2.4.3
./install.pl 
cd /tmp
rm -R .psad
exit

2. Edit the PSAD configuration file.

  • Three main settings need to be set in the PSAD configuration file before we can complete the install, edit the others as required.
  • open a Terminal Window and enter :
vi /etc/psad/psad.conf
  • EMAIL_ADDRESSES – change this to your email address.
  • HOSTNAME – this is set during install – but double check and change to a FQDN if needed.
  • ENABLE_AUTO_IDS – set this to Y if you could like PSAD to take action – read configuration instructions before setting this to Y.
  • ENABLE_AUTO_IDS_EMAILS – set this to Y if you would like to receive email notifications of intrusions that are detected.

3. Add iptables LOG rules for both IPv4 and IPv6.

  • For an explanation of this step click here.
  • Add the following iptables policies :
iptables -A INPUT -j LOG
iptables -A FORWARD -j LOG
ip6tables -A INPUT -j LOG
ip6tables -A FORWARD -j LOG

4. Reload and update PSAD.

  • To restart, update the signature file and reload PSAD to complete the install open a Terminal Window and enter :
psad -R
psad --sig-update
psad -H
  • To check the status of PSAD, open a Terminal Window and enter :
psad --Status
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