Verify nftables Service is Enabled

Docs > Datadog Security > OOTB Rules > Verify nftables Service is Enabled

Description

The nftables service allows for the loading of nftables rulesets during boot, or starting on the nftables service

The nftables service can be enabled with the following command:

$ sudo systemctl enable nftables.service

Rationale

The nftables service restores the nftables rules from the rules files referenced in the /etc/sysconfig/nftables.conf file during boot or the starting of the nftables service

Remediation

Shell script

The following script can be run on the host to remediate the issue.

#!/bin/bash

# Remediation is applicable only in certain platforms
if ( [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ] && dpkg-query --show --showformat='${db:Status-Status}\n' 'nftables' 2>/dev/null | grep -q installed ); then

SYSTEMCTL_EXEC='/usr/bin/systemctl'
"$SYSTEMCTL_EXEC" unmask 'nftables.service'
"$SYSTEMCTL_EXEC" start 'nftables.service'
"$SYSTEMCTL_EXEC" enable 'nftables.service'

else
    >&2 echo 'Remediation is not applicable, nothing was done'
fi

Ansible playbook

The following playbook can be run with Ansible to remediate the issue.

- name: Gather the package facts
  package_facts:
    manager: auto
  tags:
  - enable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_nftables_enabled

- name: Enable service nftables
  block:

  - name: Gather the package facts
    package_facts:
      manager: auto

  - name: Enable service nftables
    systemd:
      name: nftables
      enabled: 'yes'
      state: started
      masked: 'no'
    when:
    - '"nftables" in ansible_facts.packages'
  when: ( ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman",
    "container"] and "nftables" in ansible_facts.packages )
  tags:
  - enable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_nftables_enabled