Every software and system is vulnerable to hacking, hence it’s a primary job to secure online website or blog. As we are using WordPress CMS, thankfully we have WP fail2ban plugin improving overall security and tackle malicious parties.
In this article, I’m going to cover how to install and configure the fail2ban program. Fail2ban will help WordPress from brute-force attack and also eliminate the ban login attempts.
Let’s dive in learning more about the fail2ban program —
What is Fail2ban?
Fail2ban scans log files and ban IPs that show the malicious signs — too many password failures, seeking for exploits, etc. It protects computer servers from brute-force attacks.
The program is written in the python script and out-of-box support various software programs and servers like, Nginx, Postfix, Sendmail, etc.
In our case, we will be using Fail2ban to support WordPress malicious login attempts.
Install fail2ban on Ubuntu & WordPress
The fail2ban is not pre-installed in the Ubuntu cloud server. You can run the following command to update the APT repository and install the fail2ban program.
sudo apt-get update sudo apt-get install fail2ban
Once you’ve installed the program on the server, you will also need to add the WordPress Plugin called WP fail2ban.
This plugin help to capture all the WordPress logins along with IP in a log file. This log file records will be used by Fail2ban to ban the IP address with multiple invalid attempts.
Follow the steps to install WP fail2ban on WordPress:
- Login to WordPress Dashboard
- Navigate to Add New under Plugins menu
- Search and Install WP fail2ban plugin
- Activate the Plugin and that’s all
The Plugin also has a premium version that allows configuring in UI. However, since we are using the free version, we need to set up the filter and jail condition manually on the server-side.
Don’t worry, it’s quite easy!
Setting up the Filter and Jail
Now that we have installed on both server and WordPress, let’s copy the backend filter matching regexes file in the fail2ban directory.
Use the below command to copy the WordPress hard regexes conf file to filter.d directory.
sudo curl https://plugins.svn.wordpress.org/wp-fail2ban/trunk/filters.d/wordpress-hard.conf > /etc/fail2ban/filter.d/wordpress.conf
[Note: there is also a soft filter configuration file, however, I strongly recommend to use the hard for better security.]
Next, we will set up the jail for invalid authentication. Create a WordPress Jail file using the below command:
sudo nano /etc/fail2ban/jail.d/wordpress.conf
Paste the below Jail rules in the wordpress.conf the file that we created above.
[wordpress] enabled = true filter = wordpress logpath = /var/log/auth.log port = http,https
Save and close the nano editor with Jail configuration.
Customizing the Jail
You can customize the Jail OR Ban configuration using the jail.conf. There are multiple settings available in this file.
However, I’d strongly suggest not to make any changes unless you know what you’re doing.
sudo nano /etc/fail2ban/jail.conf
The entries will be available under [default] code block. And I will be making only 3 changes:
- Maximum login attempts before the ban to 3
- Maximum 3 login attempts in the time span of 3 hours (i.e. findtime)
- Maximum jail or ban for 12 hours after 3 invalid logins attempts
maxretry = 3 .. findtime = 3h .. bantime = 12h
Now that we are all set with Filter and Jail configuration, restart the fail2ban using below command:
sudo service fail2ban restart
Now finally, test the fail2ban with multiple invalid logins attempts your WordPress login screen. I’m sure after the third incorrect login attempt, the WordPress blog will be inaccessible for 12 hours of ban time.
Just in case if you got your IP address banned, you need to look up for the Banned IP Address in [log]/etc/log/fail2ban.log[/code].
And use below command to un-ban:
fail2ban-client set wordpress unbanip YOUR.IP.ADDRESS.HERE
Watch the setup video of fail2ban
Watch this video setup of fail2ban and learn how to configure the jails and filters to block invalid login attempts.
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What’s next in #WordPresCloud Series
Now that you’ve learned how to secure the WordPress installation with WP fail2ban plugin, we will next learn about how to optimize the MySQL database. We will be using a sweet plugin WP-Optimize for the same.
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