shorewall_code/Shorewall/manpages/shorewall-exclusion.xml

183 lines
6.0 KiB
XML
Raw Normal View History

<?xml version="1.0" encoding="UTF-8"?>
2010-07-19 23:45:05 +02:00
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
<refentry>
<refmeta>
<refentrytitle>shorewall-exclusion</refentrytitle>
<manvolnum>5</manvolnum>
<refmiscinfo>Configuration Files</refmiscinfo>
</refmeta>
<refnamediv>
<refname>exclusion</refname>
<refpurpose>Exclude a set of hosts from a definition in a shorewall
configuration file.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<arg choice="plain"
rep="repeat"><option>!</option><replaceable>address-or-range</replaceable>[,<replaceable>address-or-range</replaceable>]</arg>
</cmdsynopsis>
<cmdsynopsis>
<arg choice="plain"
rep="repeat"><option>!</option><replaceable>zone-name</replaceable>[,<replaceable>zone-name</replaceable>]</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>The first form of exclusion is used when you wish to exclude one or
2013-05-03 18:19:45 +02:00
more addresses from a definition. An exclamation point is followed by a
comma-separated list of addresses. The addresses may be single host
addresses (e.g., 192.168.1.4) or they may be network addresses in CIDR
format (e.g., 192.168.1.0/24). If your kernel and iptables include iprange
support, you may also specify ranges of ip addresses of the form
<emphasis>lowaddress</emphasis>-<emphasis>highaddress</emphasis></para>
2013-05-03 18:19:45 +02:00
<para>No embedded white-space is allowed.</para>
<para>Exclusion can appear after a list of addresses and/or address
ranges. In that case, the final list of address is formed by taking the
first list and then removing the addresses defined in the
exclusion.</para>
<para>Beginning in Shorewall 4.4.13, the second form of exclusion is
allowed after <emphasis role="bold">all</emphasis> and <emphasis
role="bold">any</emphasis> in the SOURCE and DEST columns of <ulink
url="/manpages/shorewall-rules.html">shorewall-rules</ulink>(5). It allows
you to omit arbitrary zones from the list generated by those key
words.</para>
<warning>
<para>If you omit a sub-zone and there is an explicit or explicit
CONTINUE policy, a connection to/from that zone can still be matched by
the rule generated for a parent zone.</para>
<para>For example:</para>
<blockquote>
<para>/etc/shorewall/zones:</para>
<programlisting>#ZONE TYPE
z1 ip
z2:z1 ip
...</programlisting>
<para>/etc/shorewall/policy:</para>
<programlisting>#SOURCE DEST POLICY
z1 net CONTINUE
z2 net REJECT</programlisting>
<para>/etc/shorewall/rules:</para>
<programlisting>#ACTION SOURCE DEST PROTO DPORT
ACCEPT all!z2 net tcp 22</programlisting>
<para>In this case, SSH connections from <emphasis
role="bold">z2</emphasis> to <emphasis role="bold">net</emphasis> will
be accepted by the generated <emphasis role="bold">z1</emphasis> to
net ACCEPT rule.</para>
</blockquote>
</warning>
<para>In most contexts, ipset names can be used as an
<replaceable>address-or-range</replaceable>. Beginning with Shorewall
4.4.14, ipset lists enclosed in +[...] may also be included (see <ulink
url="/manpages/shorewall-ipsets.html">shorewall-ipsets</ulink> (5)). The
semantics of these lists when used in an exclusion are as follows:</para>
<itemizedlist>
<listitem>
<para>!+[<replaceable>set1</replaceable>,<replaceable>set2</replaceable>,...<replaceable>setN</replaceable>]
produces a packet match if the packet does not match at least one of
the sets. In other words, it is like NOT match
<replaceable>set1</replaceable> OR NOT match
<replaceable>set2</replaceable> ... OR NOT match
<replaceable>setN</replaceable>.</para>
</listitem>
<listitem>
<para>+[!<replaceable>set1</replaceable>,!<replaceable>set2</replaceable>,...!<replaceable>setN</replaceable>]
produces a packet match if the packet does not match any of the sets.
In other words, it is like NOT match <replaceable>set1</replaceable>
AND NOT match <replaceable>set2</replaceable> ... AND NOT match
<replaceable>setN</replaceable>.</para>
</listitem>
</itemizedlist>
</refsect1>
<refsect1>
<title>Examples</title>
<variablelist>
<varlistentry>
<term>IPv4 Example 1 - All IPv4 addresses except 192.168.3.4</term>
<listitem>
<para>!192.168.3.4</para>
</listitem>
</varlistentry>
<varlistentry>
<term>IPv4 Example 2 - All IPv4 addresses except the network
192.168.1.0/24 and the host 10.2.3.4</term>
<listitem>
<para>!192.168.1.0/24,10.1.3.4</para>
</listitem>
</varlistentry>
<varlistentry>
<term>IPv4 Example 3 - All IPv4 addresses except the range
192.168.1.3-192.168.1.12 and the network 10.0.0.0/8</term>
<listitem>
<para>!192.168.1.3-192.168.1.12,10.0.0.0/8</para>
</listitem>
</varlistentry>
<varlistentry>
<term>IPv4 Example 4 - The network 192.168.1.0/24 except hosts
192.168.1.3 and 192.168.1.9</term>
<listitem>
<para>192.168.1.0/24!192.168.1.3,192.168.1.9</para>
</listitem>
</varlistentry>
<varlistentry>
<term>Example 5 - All parent zones except loc</term>
<listitem>
<para>any!loc</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>FILES</title>
<para>/etc/shorewall/hosts</para>
<para>/etc/shorewall/masq</para>
<para>/etc/shorewall/rules</para>
<para>/etc/shorewall/tcrules</para>
</refsect1>
<refsect1>
<title>See ALSO</title>
<para>shorewall(8)</para>
</refsect1>
2010-07-19 23:45:05 +02:00
</refentry>