shorewall_code/manpages/shorewall-zones.xml

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<refentry>
  <refmeta>
    <refentrytitle>shorewall-zones</refentrytitle>

    <manvolnum>5</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>zones</refname>

    <refpurpose>Shorewall zone declaration file</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <cmdsynopsis>
      <command>/etc/shorewall/zones</command>
    </cmdsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para>The /etc/shorewall/zones file declares your network zones. You
    specify the hosts in each zone through entries in
    <filename>/etc/shorewall/interfaces</filename> or
    <filename>/etc/shorewall/hosts</filename>.</para>

    <warning>
      <para>The format of this file changed in Shorewall 3.0.0. You can
      continue to use your old records provided that you set IPSECFILE=ipsec
      in /etc/shorewall/shorewall.conf. This will signal Shorewall that the
      IPSEC-related zone options are still specified in /etc/shorewall/ipsec
      rather than in this file.</para>

      <para>To use records in the format described below, you must have
      IPSECFILE=zones specified in
      <filename>/etc/shorewall/shorewall.conf</filename> AND YOU MUST NOT SET
      THE 'FW' VARIABLE IN THAT FILE.</para>
    </warning>

    <para>The columns in the file are as follows.</para>

    <variablelist>
      <varlistentry>
        <term><emphasis role="bold">ZONE</emphasis></term>

        <listitem>
          <para>Short name of the zone. The names "all" and "none" are
          reserved and may not be used as zone names. The maximum length of a
          zone name is determined by the setting of the LOGFORMAT option in
          shorewall.conf. With the default LOGFORMAT, zone names can be at
          most 5 characters long.</para>

          <para>Where a zone is nested in one or more other zones, you may
          follow the (sub)zone name by ":" and a comma-separated list of the
          parent zones. The parent zones must have been defined in earlier
          records in this file.</para>

          <para>Example:</para>

          <programlisting>#ZONE     TYPE     OPTIONS         IN OPTIONS        OUT OPTIONS
a         ipv4
b         ipv4
c:a,b     ipv4</programlisting>

          <para>Currently, Shorewall uses this information to reorder the zone
          list so that parent zones appear after their subzones in the list.
          The IMPLICIT_CONTINUE option in shorewall.conf can also create
          implicit CONTINUE policies to/from the subzone.</para>

          <para>In the future, Shorewall may make additional use of nesting
          information.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">TYPE</emphasis></term>

        <listitem>
          <variablelist>
            <varlistentry>
              <term><emphasis role="bold">ipv4</emphasis></term>

              <listitem>
                <para>This is the standard Shorewall zone type and is the
                default if you leave this column empty or if you enter "-" in
                the column. Communication with some zone hosts may be
                encrypted. Encrypted hosts are designated using the
                'ipsec'option in /etc/shorewall/hosts.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">ipsec</emphasis></term>

              <listitem>
                <para>Communication with all zone hosts is encrypted. Your
                kernel and iptables must include policy match support.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">fw</emphasis></term>

              <listitem>
                <para>Designates the firewall itself. You must have exactly
                one 'firewall' zone. No options are permitted with a
                'firewall' zone. The name that you enter in the ZONE column
                will be stored in the shell variable $FW which you may use in
                other configuration files to designate the firewall
                zone.</para>
              </listitem>
            </varlistentry>
          </variablelist>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">OPTIONS, IN OPTIONS and OUT
        OPTIONS</emphasis></term>

        <listitem>
          <para>A comma-separated list of options.</para>

          <variablelist>
            <varlistentry>
              <term><emphasis
              role="bold">reqid=</emphasis><emphasis>number</emphasis></term>

              <listitem>
                <para>where <emphasis>number</emphasis> is specified using
                setkey(8) using the 'unique:<emphasis>number</emphasis> option
                for the SPD level.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">spi=</emphasis>&lt;number&gt;</term>

              <listitem>
                <para>where <emphasis>number</emphasis> is the SPI of the SA
                used to encrypt/decrypt packets.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">proto=</emphasis><emphasis
              role="bold">ah</emphasis>|<emphasis
              role="bold">esp</emphasis>|<emphasis
              role="bold">ipcomp</emphasis></term>

              <listitem>
                <para>IPSEC Encapsulation Protocol</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis
              role="bold">mss=</emphasis><emphasis>number</emphasis></term>

              <listitem>
                <para>sets the MSS field in TCP packets</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">mode=</emphasis><emphasis
              role="bold">transport</emphasis>|<emphasis
              role="bold">tunnel</emphasis></term>

              <listitem>
                <para>IPSEC mode</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis
              role="bold">tunnel-src=</emphasis><emphasis>address</emphasis>[/<emphasis>mask</emphasis>]</term>

              <listitem>
                <para>only available with mode=tunnel</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis
              role="bold">tunnel-dst=</emphasis><emphasis>address</emphasis>[/<emphasis>mask</emphasis>]</term>

              <listitem>
                <para>only available with mode=tunnel</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">strict</emphasis></term>

              <listitem>
                <para>Means that packets must match all rules.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term><emphasis role="bold">next</emphasis></term>

              <listitem>
                <para>Separates rules; can only be used with strict</para>
              </listitem>
            </varlistentry>
          </variablelist>

          <para>The options in the OPTIONS column are applied to both incoming
          and outgoing traffic. The IN OPTIONS are applied to incoming traffic
          (in addition to OPTIONS) and the OUT OPTIONS are applied to outgoing
          traffic.</para>

          <para>If you wish to leave a column empty but need to make an entry
          in a following column, use "-".</para>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>FILES</title>

    <para>/etc/shorewall/zones</para>
  </refsect1>

  <refsect1>
    <title>See ALSO</title>

    <para>shorewall(8), shorewall-accounting(5), shorewall-actions(5),
    shorewall-blacklist(5), shorewall-hosts(5), shorewall-interfaces(5),
    shorewall-ipsec(5), shorewall-maclist(5), shorewall-masq(5),
    shorewall-nat(5), shorewall-netmap(5), shorewall-params(5),
    shorewall-policy(5), shorewall-providers(5), shorewall-proxyarp(5),
    shorewall-route_routes(5), shorewall-routestopped(5), shorewall-rules(5),
    shorewall.conf(5), shorewall-tcclasses(5), shorewall-tcdevices(5),
    shorewall-tcrules(5), shorewall-tos(5), shorewall-tunnels(5)</para>
  </refsect1>
</refentry>