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331 lines
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331 lines
13 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-policy</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>policy</refname>
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<refpurpose>Shorewall policy file</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>/etc/shorewall/policy</command>
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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>This file defines the high-level policy for connections between
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zones defined in <ulink
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url="shorewall-zones.html">shorewall-zones</ulink>(5).</para>
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<important>
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<para>The order of entries in this file is important</para>
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<para>This file determines what to do with a new connection request if
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we don't get a match from the /etc/shorewall/rules file . For each
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source/destination pair, the file is processed in order until a match is
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found ("all" will match any client or server).</para>
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</important>
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<important>
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<para>Intra-zone policies are pre-defined</para>
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<para>For $FW and for all of the zones defined in /etc/shorewall/zones,
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the POLICY for connections from the zone to itself is ACCEPT (with no
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logging or TCP connection rate limiting) but may be overridden by an
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entry in this file. The overriding entry must be explicit (cannot use
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"all" in the SOURCE or DEST).</para>
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<para>Similarly, if you have IMPLICIT_CONTINUE=Yes in shorewall.conf,
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then the implicit policy to/from any sub-zone is CONTINUE. These
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implicit CONTINUE policies may also be overridden by an explicit entry
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in this file.</para>
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</important>
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<para>The columns in the file are as follows (where the column name is
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followed by a different name in parentheses, the different name is used in
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the alternate specification syntax).</para>
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<variablelist>
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<varlistentry>
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<term><emphasis role="bold">SOURCE</emphasis> -
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<emphasis>zone</emphasis>|<emphasis
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role="bold">$FW</emphasis>|<emphasis role="bold">all</emphasis></term>
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<listitem>
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<para>Source zone. Must be the name of a zone defined in <ulink
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url="shorewall-zones.html">shorewall-zones</ulink>(5), $FW or
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"all".</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">DEST</emphasis> -
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<emphasis>zone</emphasis>|<emphasis
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role="bold">$FW</emphasis>|<emphasis role="bold">all</emphasis></term>
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<listitem>
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<para>Destination zone. Must be the name of a zone defined in <ulink
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url="shorewall-zones.html">shorewall-zones</ulink>(5), $FW or "all".
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If the DEST is a bport zone, then the SOURCE must be "all", another
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bport zone associated with the same bridge, or it must be an ipv4
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zone that is associated with only the same bridge.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">POLICY</emphasis> - {<emphasis
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role="bold">ACCEPT</emphasis>|<emphasis
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role="bold">DROP</emphasis>|<emphasis
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role="bold">REJECT</emphasis>|<emphasis
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role="bold">CONTINUE</emphasis>|<emphasis
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role="bold">QUEUE</emphasis>|<emphasis
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role="bold">NFQUEUE</emphasis>[(<emphasis>queuenumber</emphasis>)]|<emphasis
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role="bold">NONE</emphasis>}[<emphasis
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role="bold">:</emphasis>{<emphasis>default-action-or-macro</emphasis>|<emphasis
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role="bold">None</emphasis>}]</term>
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<listitem>
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<para>Policy if no match from the rules file is found.</para>
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<para>If the policy is neither CONTINUE nor NONE then the policy may
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be followed by ":" and one of the following:</para>
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<orderedlist numeration="loweralpha">
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<listitem>
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<para>The word "None" or "none". This causes any default action
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defined in <ulink
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url="shorewall.conf.html">shorewall.conf</ulink>(5) to be
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omitted for this policy.</para>
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</listitem>
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<listitem>
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<para>The name of an action (requires that USE_ACTIONS=Yes in
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<ulink url="shorewall.conf.html">shorewall.conf</ulink>(5)).
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That action will be invoked before the policy is
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enforced.</para>
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</listitem>
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<listitem>
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<para>The name of a macro. The rules in that macro will be
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applied before the policy is enforced. This does not require
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USE_ACTIONS=Yes.</para>
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</listitem>
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</orderedlist>
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<blockquote>
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<programlisting></programlisting>
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<para>Possible policies are:</para>
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</blockquote>
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<variablelist>
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<varlistentry>
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<term><emphasis role="bold">ACCEPT</emphasis></term>
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<listitem>
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<para>Accept the connection.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">DROP</emphasis></term>
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<listitem>
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<para>Ignore the connection request.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">REJECT</emphasis></term>
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<listitem>
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<para>For TCP, send RST. For all other, send an "unreachable"
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ICMP.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">QUEUE</emphasis></term>
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<listitem>
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<para>Queue the request for a user-space application such as
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Snort-inline.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">NFQUEUE</emphasis></term>
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<listitem>
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<para>Queue the request for a user-space application using the
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nfnetlink_queue mechanism. If a
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<replaceable>queuenumber</replaceable> is not given, queue
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zero (0) is assumed.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">CONTINUE</emphasis></term>
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<listitem>
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<para>Pass the connection request past any other rules that it
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might also match (where the source or destination zone in
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those rules is a superset of the SOURCE or DEST in this
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policy). See <ulink
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url="shorewall-nesting.html">shorewall-nesting</ulink>(5) for
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additional information.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">NONE</emphasis></term>
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<listitem>
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<para>Assume that there will never be any packets from this
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SOURCE to this DEST. Shorewall will not create any
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infrastructure to handle such packets and you may not have any
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rules with this SOURCE and DEST in the /etc/shorewall/rules
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file. If such a packet <emphasis role="bold">is</emphasis>
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received, the result is undefined. NONE may not be used if the
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SOURCE or DEST columns contain the firewall zone ($FW) or
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"all".</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">LOG LEVEL</emphasis> (loglevel) -
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[<emphasis>log-level</emphasis>|<emphasis
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role="bold">ULOG|NFLOG</emphasis>]</term>
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<listitem>
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<para>Optional - if supplied, each connection handled under the
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default POLICY is logged at that level. If not supplied, no log
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message is generated. See syslog.conf(5) for a description of log
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levels.</para>
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<para>You may also specify ULOG or NFLOG (must be in upper case).
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This will log to the ULOG or NFLOG target and will send to a
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separate log through use of ulogd (<ulink
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url="http://www.netfilter.org/projects/ulogd/index.html">http://www.netfilter.org/projects/ulogd/index.html</ulink>).</para>
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<para>If you don't want to log but need to specify the following
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column, place "-" here.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">BURST:LIMIT</emphasis> (limit) -
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[{<emphasis>s</emphasis>|<emphasis
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role="bold">d</emphasis>}:[[<replaceable>name</replaceable>]:]]]<emphasis>rate</emphasis><emphasis
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role="bold">/</emphasis>{<emphasis
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role="bold">second</emphasis>|<emphasis
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role="bold">minute</emphasis>}[:<emphasis>burst</emphasis>]</term>
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<listitem>
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<para>If passed, specifies the maximum TCP connection
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<emphasis>rate</emphasis> and the size of an acceptable
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<emphasis>burst</emphasis>. If not specified, TCP connections are
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not limited. If the <replaceable>burst</replaceable> parameter is
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omitted, a value of 5 is assumed.</para>
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<para>When <option>s:</option> or <option>d:</option> is specified,
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the rate applies per source IP address or per destination IP address
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respectively. The <replaceable>name</replaceable> may be chosen by
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the user and specifies a hash table to be used to count matching
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connections. If not give, the name <emphasis
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role="bold">shorewall</emphasis> is assumed. Where more than one
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POLICY specifies the same name, the connections counts for the
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policies are aggregated and the individual rates apply to the
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aggregated count.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">CONNLIMIT</emphasis> -
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<emphasis>limit</emphasis>[:<emphasis>mask</emphasis>]</term>
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<listitem>
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<para>May be used to limit the number of simultaneous connections
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from each individual host to <replaceable>limit</replaceable>
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connections. While the limit is only checked on connections to which
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this policy could apply, the number of current connections is
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calculated over all current connections from the SOURCE host. By
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default, the limit is applied to each host individually but can be
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made to apply to networks of hosts by specifying a
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<replaceable>mask</replaceable>. The <replaceable>mask</replaceable>
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specifies the width of a VLSM mask to be applied to the source
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address; the number of current connections is then taken over all
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hosts in the subnet
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<replaceable>source-address</replaceable>/<replaceable>mask</replaceable>.</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>Example</title>
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<orderedlist numeration="loweralpha">
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<listitem>
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<para>All connections from the local network to the internet are
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allowed</para>
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</listitem>
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<listitem>
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<para>All connections from the internet are ignored but logged at
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syslog level KERNEL.INFO.</para>
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</listitem>
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<listitem>
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<para>All other connection requests are rejected and logged at level
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KERNEL.INFO.</para>
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</listitem>
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</orderedlist>
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<programlisting> #SOURCE DEST POLICY LOG BURST:LIMIT
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# LEVEL
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loc net ACCEPT
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net all DROP info
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#
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# THE FOLLOWING POLICY MUST BE LAST
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#
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all all REJECT info</programlisting>
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</refsect1>
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<refsect1>
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<title>FILES</title>
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<para>/etc/shorewall/policy</para>
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</refsect1>
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<refsect1>
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<title>See ALSO</title>
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<para><ulink
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url="http://shorewall.net/configuration_file_basics.htm#Pairs">http://shorewall.net/configuration_file_basics.htm#Pairs</ulink></para>
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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-rtrules(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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