Puppet Class: cis_security_hardening::rules::ip6tables_loopback

Defined in:
manifests/rules/ip6tables_loopback.pp

Summary

Ensure loopback traffic is configured

Overview

Configure the loopback interface to accept traffic. Configure all other interfaces to deny traffic to the loopback network (127.0.0.0/8).

Rationale: Loopback traffic is generated between processes on machine and is typically critical to operation of the system. The loopback interface is the only place that loopback network (127.0.0.0/8) traffic should be seen, all other interfaces should ignore traffic on this network as an anti-spoofing measure.

Examples:

class { 'cis_security_hardening::rules::ip6tables_loopback':
    enforce => true,
}

Parameters:

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

    Enforce the rule



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# File 'manifests/rules/ip6tables_loopback.pp', line 21

class cis_security_hardening::rules::ip6tables_loopback (
  Boolean $enforce = false,
) {
  if  $enforce and fact('network6') != undef {
    firewall { '001-6 accept all incoming traffic to local interface':
      chain    => 'INPUT',
      proto    => 'all',
      iniface  => 'lo',
      jump     => 'ACCEPT',
      protocol => 'ip6tables',
    }
    firewall { '002-6 accept all outgoing traffic to local interface':
      chain    => 'OUTPUT',
      proto    => 'all',
      outiface => 'lo',
      jump     => 'ACCEPT',
      protocol => 'ip6tables',
    }

    firewall { '003-6 drop all traffic to lo ::1':
      chain    => 'INPUT',
      proto    => 'all',
      source   => '::1',
      jump     => 'DROP',
      protocol => 'ip6tables',
    }
  }
}