Ensure firewalld backend is configured

MediumLevel 1Automatedlinux

Description

The FirewallBackend option selects the firewall backend implementation. Choices are: • nftables (default) • iptables (iptables, ip6tables, ebtables and ipset)

How it is checked

Audit method: Shell command

shell

alt0() { command -v grep >/dev/null 2>&1 || { echo "step1: grep not installed"; return 1; }; o=$(bash -c 'grep -Pi -- '"'"'^\h*FirewallBackend\h*=\h*iptables\b'"'"' /etc/firewalld/firewalld.conf' 2>/dev/null); [ -z "$o" ] || { echo "step1: $o" | head -c 300; return 1; }; }; if alt0; then echo compliant; fi

Expected output: compliant

How it is fixed

Fix method: Guidance or infrastructure patch

Edit the file /etc/firewalld/firewalld.conf and add or modify the following line: FirewallBackend=nftables

Properties

Operating systems: rocky-9
Tags: cis-convertedlinux
Reference: CIS Rocky Linux 9 Benchmark v3.0.0 - 4.1.2

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

shell

tmaegis scan --target linux