How to Protect Your SSH Server With Fail2Ban [Linux/Ubuntu]

How to Protect Your SSH Server With Fail2Ban [Linux/Ubuntu]

1. sudo cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local.
2. sudo nano /etc/fail2ban/jail.local.
3. [DEFAULT] # "ignoreip" can be an IP address, a CIDR mask or a DNS host ignoreip = 127.0.0.1/8 bantime = 600 maxretry = 3 # "backend" specifies the backend used to get files modification.

1. How do I protect SSH with fail2ban?
2. How do I stop fail2ban service?
3. What is fail2ban Ubuntu?
4. Do I need fail2ban?
5. How do I check if fail2ban is working?
6. How do I restart fail2ban service?
7. How do I start fail2ban?
8. How do I know if IP is fail2ban banned?
9. How do you test a fail2ban filter?
10. What is Fail ban?
11. Is fail2ban safe?
12. How do I harden my Ubuntu server?

How do I protect SSH with fail2ban?

A good way to protect SSH would be to ban an IP address from logging in if there are too many failed login attempts.
...
The basics of Fail2ban

1. Filters specify certain patterns of text that Fail2ban should recognize in log files.
2. Actions are things Fail2ban can do.
3. Jails tell Fail2ban to match a filter on some logs.

How do I stop fail2ban service?

The "stop" suggestion from IgorG will completly stop fail2ban. If you didn't configure automatic restarts for the fail2ban service, it will be stopped upon your next server restart. Optional you can try to restart the fail2ban service with "service fail2ban start" ( or "/etc/init.

What is fail2ban Ubuntu?

Fail2Ban is an intrusion prevention framework written in the Python programming language. It works by reading SSH, ProFTP, Apache logs etc.. and uses iptables profiles to block brute-force attempts.

Do I need fail2ban?

YES! It will only reduce load on your system. It'd be nice if someone made a utility which takes events caught by fail2ban and automatically sent emails to the network admins for those events. A script to monitor for f2b events and send an email should be pretty easy to write.

How do I check if fail2ban is working?

log if fail2ban has been started. You'll also see output related to fail2ban activity. If you installed failed2ban via the package manager or software center, you should see entries in the /etc/rc* directories for fail2ban, which indicate (on default settings and without customization) that it will run on startup.

How do I restart fail2ban service?

Now we can restart the fail2ban service using systemctl : sudo systemctl restart fail2ban.

How do I start fail2ban?

Configuring fail2ban

1. Log in to your server using SSH.
2. At the command prompt, type the following command: cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local. ...
3. Open the jail. ...
4. Locate the [DEFAULT] section, which contains the following global options: ...
5. Save your changes to the jail.

How do I know if IP is fail2ban banned?

sqlite3 database (if your fail2ban version < v0. 11.1 , change bips to bans ). If you want to see structure and all data of this file in a GUI app, I recommend DB Browser For Sqlite . This will show what is currently banned (REJECT) in the Chain fail2ban-ssh portion of iptables.

How do you test a fail2ban filter?

The simplest way to check whether a filter is appropriate for your server is to test it using the fail2ban-regex script. The output will look something like the following: Running tests ============= Use regex file : /etc/fail2ban/filter. d/apache-auth.

What is Fail ban?

Fail2Ban is an intrusion prevention software framework that protects computer servers from brute-force attacks. Written in the Python programming language, it is able to run on POSIX systems that have an interface to a packet-control system or firewall installed locally, for example, iptables or TCP Wrapper.

Is fail2ban safe?

It's important to note that fail2ban is just a small part of a full server security program. It's not a replacement for using secure passwords or hardening the server by limiting the number of exposed services. Nevertheless, if your server is plagued by automated bots, fail2ban is a great tool for limiting the impact.

How do I harden my Ubuntu server?

The following tips and tricks are some easy ways to quickly harden an Ubuntu server.

1. Keep System Up-To-Date. ...
2. Accounts. ...
3. Ensure Only root Has UID of 0. ...
4. Check for Accounts with Empty Passwords. ...
5. Lock Accounts. ...
6. Adding New User Accounts. ...
7. Sudo Configuration. ...
8. IpTables.