Description: “OSSEC is an Open Source Host-based Intrusion Detection System. It performs log analysis, file integrity checking, policy monitoring, rootkit detection, real-time alerting and active response. It runs on most operating systems, including Linux, MacOS, Solaris, HP-UX, AIX and Windows.”
Installation:
- Install the needed packages with the following command:
apt-get install gcc g++ make
- Download the latest version from its web.
- Uncompress it:
tar xvfz ossec-hids-latest.tar.gz
- Run the installation script:
cd ossec-hids-* && ./install.sh
Here are the installation steps (with my answers in boldface):
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** For installation in English, choose [en].
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(en/br/cn/de/el/es/fr/it/jp/nl/pl/ru/sr/tr) [en]:
en
OSSEC HIDS v2.2 Installation Script – http://www.ossec.net
You are about to start the installation process of the OSSEC HIDS.
You must have a C compiler pre-installed in your system.
If you have any questions or comments, please send an e-mail
to dcid@ossec.net (or daniel.cid@gmail.com).
– System: Linux
– User: root
– Host: server
— Press ENTER to continue or Ctrl-C to abort. —
1- What kind of installation do you want (server, agent, local or help)? local
2- Setting up the installation environment.
– Choose where to install the OSSEC HIDS [/var/ossec]: /opt/ossec
– Installation will be made at /opt/ossec .
3- Configuring the OSSEC HIDS.
3.1- Do you want e-mail notification? (y/n) [y]: y
– What’s your e-mail address? myemail@mydomain.com
– We found your SMTP server as: mail.mydomain.com.
– Do you want to use it? (y/n) [y]: y
— Using SMTP server: mail.mydomain.com.
3.2- Do you want to run the integrity check daemon? (y/n) [y]: y
– Running syscheck (integrity check daemon).
3.3- Do you want to run the rootkit detection engine? (y/n) [y]: y
– Running rootcheck (rootkit detection).
3.4- Active response allows you to execute a specific
command based on the events received. For example,
you can block an IP address or disable access for
a specific user.
More information at:
http://www.ossec.net/en/manual.html#active-response
– Do you want to enable active response? (y/n) [y]: y
– Active response enabled.
– By default, we can enable the host-deny and the
firewall-drop responses. The first one will add
a host to the /etc/hosts.deny and the second one
will block the host on iptables (if linux) or on
ipfilter (if Solaris, FreeBSD or NetBSD).
– They can be used to stop SSHD brute force scans,
portscans and some other forms of attacks. You can
also add them to block on snort events, for example.
– Do you want to enable the firewall-drop response? (y/n) [y]: y
– firewall-drop enabled (local) for levels >= 6
– Default white list for the active response:
– 10.0.0.1
– 10.0.0.2
– Do you want to add more IPs to the white list? (y/n)? [n]: n
3.6- Setting the configuration to analyze the following logs:
— /var/log/messages
— /var/log/auth.log
— /var/log/syslog
— /var/log/mail.info
— /var/log/dpkg.log
– If you want to monitor any other file, just change
the ossec.conf and add a new localfile entry.
Any questions about the configuration can be answered
by visiting us online at http://www.ossec.net .
— Press ENTER to continue —
5- Installing the system
– Running the Makefile
INFO: Little endian set.
(COMPILATION CODE GOES HERE)
– System is Debian (Ubuntu or derivative).
– Init script modified to start OSSEC HIDS during boot.
– Configuration finished properly.
– To start OSSEC HIDS:
/opt/ossec/bin/ossec-control start
– To stop OSSEC HIDS:
/opt/ossec/bin/ossec-control stop
– The configuration can be viewed or modified at /opt/ossec/etc/ossec.conf
Thanks for using the OSSEC HIDS.
If you have any question, suggestion or if you find any bug,
contact us at contact@ossec.net or using our public maillist at
ossec-list@ossec.net
( http://www.ossec.net/main/support/ ).
More information can be found at http://www.ossec.net
— Press ENTER to finish (maybe more information below). —
I chose to perform a local installation because it’s the simplest one and it’s enough for the purpose of this article. I set /opt/ossec as the installation directory according to the Filesystem Hierarchy Standard.
Configuration: You can configure your OSSEC installation editing /opt/ossec/etc/ossec.conf . I recommend to add the email_maxperhour option to limit the number of mails received from OSSEC.
After editing /opt/ossec/etc/ossec.conf , don’t forget to restart OSSEC with this command: /opt/ossec/bin/ossec-control restart
.