From Red Hat Enterprise Linux 7 Security Technical Implementation Guide
Part of SRG-OS-000480-GPOS-00227
Associated with: CCI-000366
Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Application firewalls limit which applications are allowed to communicate over the network.
Verify the operating system enabled an application firewall. Check to see if "firewalld" is installed with the following command: # yum list installed firewalld firewalld-0.3.9-11.el7.noarch.rpm If the "firewalld" package is not installed, ask the System Administrator if another firewall application (such as iptables) is installed. If an application firewall is not installed, this is a finding. Check to see if the firewall is loaded and active with the following command: # systemctl status firewalld firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled) Active: active (running) since Tue 2014-06-17 11:14:49 CEST; 5 days ago If "firewalld" does not show a status of "loaded" and "active", this is a finding. Check the state of the firewall: # firewall-cmd --state running If "firewalld" does not show a state of "running", this is a finding.
Ensure the operating system's application firewall is enabled. Install the "firewalld" package, if it is not on the system, with the following command: # yum install firewalld Start the firewall via "systemctl" with the following command: # systemctl start firewalld
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