Thursday, August 17, 2017

Quicky secure Apache

LAMP stack which stands for Linux, Apache, MySQL/MariaDB and PHP/Python/Perl is a very popular model for serving websites.

This is my take on quickly and briefly apache on your server.

Securing Apache:

The default for Apache reveals a little too much about the server. Lets start by hiding some of that information, by editing:
sudo apt-get install libapache2-modsecurity
sudo vi /etc/apache2/conf-available/custom_security.conf
Paste the following:
ServerSignature Off
ServerTokens Prod 
TraceEnable Off
Options all -Indexes
Header unset ETag
Header always unset X-Powered-By
FileETag None
sudo a2enmod headers
sudo a2enconf custom_security.conf
sudo /etc/init.d/apache2 restart
Configuring mod_security:

sudo a2enmod security2
Configure the module and enable the OWASP ModSecurity Core Rule Set (CRS):
sudo mv /etc/modsecurity/modsecurity.conf-recommended /etc/modsecurity/modsecurity.conf

vi /etc/modsecurity/modsecurity.conf 
SecRuleEngine On
SecResponseBodyAccess Off
SecRequestBodyLimit 8388608
SecRequestBodyNoFilesLimit 131072
SecRequestBodyInMemoryLimit 262144
sudo rm -rf /usr/share/modsecurity-crs
sudo git clone /usr/share/modsecurity-crs
sudo mv /usr/share/modsecurity-crs/crs-setup.conf.example /usr/share/modsecurity-crs/crs-setup.conf
sudo vi /etc/apache2/mods-enabled/security2.conf
<IfModule security2_module>
  SecDataDir      /var/cache/modsecurity
  IncludeOptional /etc/modsecurity/*.conf
  IncludeOptional "/usr/share/modsecurity-crs/*.conf"
  IncludeOptional "/usr/share/modsecurity-crs/rules/*.conf
sudo /etc/init.d/apache2 restart
Be sure to keep an eye on the apache and mod_security logs but running:

sudo tail -f /var/log/apache2/*.log /var/log/mod_evasive/*
Automatic updates:

Last but not least, automatic updates. I know I said, this blog post is to secure apache, but one thing I am an advocate of, is secure your server. If you are a one man show, use unattended-upgrades.

Unattended-upgrades purpose is to keep the server current, up to date with the latest security (and other) updates automatically. This alone will allow you too sleep safe and tight at night. :)

sudo apt-get install unattended-upgrades
For extra security look at mod_evasive, and dont forget fail2ban.

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