Puppet Class: cis_security_hardening::rules::apt_unused

Defined in:
manifests/rules/apt_unused.pp

Summary

Ensure the Advance Package Tool removes all software components after updated versions have been installed

Overview

The Ubuntu operating system must be configured so that Advance Package Tool (APT) removes all software components after updated versions have been installed.

Rationale: Previous versions of software components that are not removed from the information system after updates have been installed may be exploited by adversaries. Some information technology products may remove older versions of software automatically from the information system.

Examples:

class { 'cis_security_hardening::rules::apt_unused':
  ensure => true,
}

Parameters:

  • enforce (Boolean) (defaults to: false) —

    Enforce autoremove

  • files (Array) (defaults to: ['/etc/apt/apt.conf.d/50unattended-upgrades']) —

    List of files to check



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# File 'manifests/rules/apt_unused.pp', line 23

class cis_security_hardening::rules::apt_unused (
  Boolean $enforce = false,
  Array $files = ['/etc/apt/apt.conf.d/50unattended-upgrades']
) {
  if $enforce {
    $files.each |$file| {
      file { $file:
        ensure => file,
        owner  => 'root',
        group  => 'root',
        mode   => '0644',
      }

      file_line { 'add Unattended-Upgrade::Remove-Unused-Dependencies':
        ensure             => present,
        path               => $file,
        match              => '^Unattended-Upgrade::Remove-Unused-Dependencies',
        line               => 'Unattended-Upgrade::Remove-Unused-Dependencies "true";',
        append_on_no_match => true,
      }

      file_line { 'add Unattended-Upgrade::Remove-Unused-Kernel-Packages':
        ensure             => present,
        path               => $file,
        match              => '^Unattended-Upgrade::Remove-Unused-Kernel-Packages',
        line               => 'Unattended-Upgrade::Remove-Unused-Kernel-Packages "true";',
        append_on_no_match => true,
      }
    }
  }
}