Firewalld List Rules on RHEL

In the realm of system administration, managing network traffic and security is paramount, especially in Red Hat Enterprise Linux (RHEL) environments. One powerful tool that aids in this process is firewalld, a dynamic firewall manager that uses iptables and nftables as its backend. Today, we're going to delve into the intricacies of listing rules in firewalld, a crucial aspect of understanding and managing your firewall settings on RHEL.

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Before we dive into the specifics, let's ensure we have the necessary permissions. By default, only the root user or a user with sudo privileges can manage firewalld. So, if you're not already, become the root user or use sudo for your commands.

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Understanding Firewalld Zones and Services

To effectively manage firewalld rules, it's essential to grasp the concepts of zones and services. Zones are groups of networks with similar security levels, while services are application-specific profiles that define the ports to open for a particular service.

Firewalld comes with predefined zones like public, private, and work, among others. You can also create custom zones tailored to your specific needs. Similarly, services are predefined for common applications such as SSH, HTTP, and DNS.

Listing Zones

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To list all the available zones in firewalld, use the following command:

firewall-cmd --get-zones

This will display a list of all the zones, including the default zone, which is typically public.

To see the details of a specific zone, use:

firewall-cmd --zone=zone-name --list-all

Listing Services

To list all the available services, use:

firewall-cmd --get-services

This will display a list of all the services that firewalld recognizes.

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To check which services are enabled in a specific zone, use:

firewall-cmd --zone=zone-name --list-services

Listing Rules in Firewalld

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Now that we understand zones and services, let's explore how to list rules in firewalld. Listing rules helps you understand the current firewall configuration and identify any potential security risks.

Firewalld rules can be permanent or temporary. Permanent rules persist across reboots, while temporary rules are lost upon rebooting the system.

Listing Permanent Rules

To list all the permanent rules, use:

firewall-cmd --permanent --list-all

This will display all the permanent rules, including the zones, services, and ports they apply to.

To list only the permanent rules for a specific zone, use:

firewall-cmd --permanent --zone=zone-name --list-all

Listing Temporary Rules

To list all the temporary rules, use:

firewall-cmd --list-all

This will display all the temporary rules currently active.

To list only the temporary rules for a specific zone, use:

firewall-cmd --zone=zone-name --list-all

Regularly listing and reviewing your firewalld rules is a best practice that helps maintain a secure and well-configured network. It's also a good idea to keep your permanent rules to a minimum and use temporary rules for testing or short-term needs.

In the dynamic world of system administration, staying informed about your firewall rules is not a one-time task but an ongoing process. By mastering the art of listing rules in firewalld, you're equipped to navigate your RHEL environment with confidence and agility.