CentOS 7.x Install OSSEC

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Install OSSEC server

To install OSSEC on CentOS 7.0 use following steps:

1. Disable Selinux permanently in '/etc/selinux/config'. This method needs reboot of server.

   SELINUX=disabled

2. Disable Selinux for current run by using 'setenforce 0'
3. Enable httpd in Firewall

   firewall-cmd --permanent --add-port=80/tcp
   firewall-cmd --reload

4. Install epel repository

   yum install epel-release -y

5. Install httpd

   yum install httpd -y

6. Start the httpd service & make enable on startup

   systemctl start httpd
   systemctl enable httpd

7. Install require packages for OSSEC

   yum install -y gcc php php-cgi php-devel inotify-tools httpd mysql-devel postgresql-devel

8. Download OSSEC-HIDS server

   git clone https://github.com/ossec/ossec-hids.git

9. Install OSSEC-HIDS server

   cd ossec-hids/
   ./install.sh

   Answer the following

   (en/br/cn/de/el/es/fr/hu/it/jp/nl/pl/ru/sr/tr) [en]: en
   What kind of installation do you want (server, agent, local, hybrid or help)? Server
   Choose where to install the OSSEC HIDS [/var/ossec]: Press Enter
   Do you want e-mail notification? (y/n) [y]: n
   Do you want to run the integrity check daemon? (y/n) [y]: y
   Do you want to run the rootkit detection engine? (y/n) [y]: y
   Do you want to enable active response? (y/n) [y]: n
   Do you want to enable remote syslog (port 514 udp)? (y/n) [y]: y
   --- Press ENTER to continue ---

10. Start OSSEC for first time

    /var/ossec/bin/ossec-control start

    After running OSSEC like this for first time, in future 'systemctl restart ossec' etc. can be used.

Installing OSSEC web user interface (OSSEC-wui)

1. Download and extract ossec-wui tar file from OSSEC webpage

   wget https://github.com/ossec/ossec-wui/archive/0.9.tar.gz
   tar zxf 0.9.tar.gz

   Move ossec-wui directory to web root directory

   mv ossec-wui-0.9/ /var/www/html/ossec-wui

   Navigate to ossec-wui directory and run the setup script.

   cd /var/www/html/ossec-wui/
   ./setup.sh

   Answer the following

   Username: centos
   New password: centos
   Re-type new password: centos
   Enter your web server user name (e.g. apache, www, nobody, www-data, ...) apache

   Here you can choose any username and password. The values do not seem to have any effect. User 'centos' does not needs to be any valid OS user.

2. Change the permissions

   usermod -aG ossec apache
   cd /var/www/html/ossec-wui/
   chmod 770 tmp/
   chgrp apache tmp/

3. Restart httpd & ossec

   systemctl restart httpd
   systemctl restart ossec

4. To access your ossec-wui, navigate to your browser and enter;

   http://<your-server's-IP-address>/ossec-wui/

Correct OSSEC web-UI timezone

1. OSSEC taking time zone info from '/etc/php.ini'. Change the time zone depends on your locality.

   date.timezone = Asia/Kolkata

2. Restart httpd

   systemctl restart httpd

Steps contributed by Pavan Ponamala

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