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