Previously we had cover the Installation of Zimbra Collaboration on Ubuntu 18.04. Today, we will go through the Firewall configuration with ufw for Ubuntu 18.04.
Installing UFW on Ubuntu
Install the UFW on Ubuntu by executing the command as
sudo apt-get update && sudo apt-get -y install ufw
Configure Zimbra Firewall usign UFW
Because of recent Memcache amplification attacks for UDP ports, we won’t enable udp port as it will cause serious problems. Due to this reason we will use only tcp ports which is protected from these.
Because we need an application profile for UFW, so let’s create this profile as:
sudo nano /etc/ufw/application.d/zimbra
Then add the following lines
title=Zimbra Collaboration Server
description=Open source server for email, contacts, calendar, and more.
After that enable app profile on ufw
sudo ufw allow Zimbra
sudo ufw enable
Then add ssh port as
sudo ufw allow ssh
To make any changes to the Zimbra profile, update it using:
$ sudo ufw app update Zimbra
Rules updated for profile 'Zimbra'
Skipped reloading firewall
Because for a single server installation, Memcache is not used outside the local server, consider binding it to the loopback ip address. So, use the commands:
sudo su - zimbra
zmprov ms zmhostname zimbraMemcachedBindAddress 127.0.0.1
zmprov ms zmhostname zimbraMemcachedClientServerList 127.0.0.1
Then restart Memcache services.
sudo su - zimbra -c "zmmemcachedctl restart"
Restricting Access to Admin dashboard
As it is a good practice to always restrict access to port 7071 to a trusted network or IP, so do it by typing:
$ sudo ufw allow from 192.168.1.10 to any port 7071
$ sudo ufw allow from 192.168.1.0/24 to any port 7071
So, this is how you can configure your Zimbra Server with firewall using ufw on Ubuntu 18.04 LTS.