====================
Opening the Firewall
====================

The Salt master communicates with the minions using an AES-encrypted ZeroMQ
connection. These communications are done over ports 4505 and 4506, which need
to be accessible on the master only. This document outlines suggested firewall
rules for allowing these incoming connections to the master.

.. note::

    **No firewall configuration needs to be done on Salt minions. These changes
    refer to the master only.**

iptables
========

Different Linux distributions store their iptables rules in different places,
which makes it difficult to standardize firewall documentation. I've included
some of the more common locations, but your mileage may vary.

**Fedora / Red Hat / CentOS** ::

    /etc/sysconfig/iptables

**Arch Linux** ::

    /etc/iptables/iptables.ruls

**Debian/Ubuntu** ::

    ???

Once you've found your firewall rules, you'll need to add the two lines below
to allow traffic on ``tcp/4505`` and ``tcp/4506``:

.. code-block:: diff

    + -A INPUT -m state --state new -m tcp -p tcp --dport 4505 -j ACCEPT
    + -A INPUT -m state --state new -m tcp -p tcp --dport 4506 -j ACCEPT

pf.conf
=======

The BSD-family of operating systems uses packet filter (pf). The following
example describes the additions to ``pf.conf`` needed to access the Salt
master.

.. code-block:: diff

    + pass in on $int_if proto tcp from any to $int_if port 4505
    + pass in on $int_if proto tcp from any to $int_if port 4506

Once you've made these additions to your ``pf.conf`` you'll need to reload the
new rules with the new additions. This can be done using the ``pfctl`` command.

.. code-block:: bash

    pfctl -vf /etc/pf.conf