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443 lines
19 KiB
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<?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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<refmiscinfo>Configuration Files</refmiscinfo>
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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[6]/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="/manpages/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 <ulink
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url="/manpages/shorewall-blrules.html">shorewall-blrules</ulink>(5) or
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<ulink url="/manpages/shorewall-rules.html">shorewall-rules</ulink>(5)
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files. For each source/destination pair, the file is processed in order
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until a match is found ("all" will match any source or
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destination).</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 <ulink
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url="/manpages/shorewall-zones.html">shorewall-zones</ulink>(5), the
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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 (specifying
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the zone name in both SOURCE and DEST) or it must use "all+" (Shorewall
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4.5.17 or later).</para>
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<para>Similarly, if you have IMPLICIT_CONTINUE=Yes in <ulink
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url="/manpages/shorewall.conf.html">shorewall.conf</ulink>(5), then the
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implicit policy to/from any sub-zone is CONTINUE. These implicit
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CONTINUE policies may also be overridden by an explicit entry in this
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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
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role="bold">all[+][!<replaceable>ezone</replaceable>[,...]]</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="/manpages/shorewall-zones.html">shorewall-zones</ulink>(5),
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$FW, "all" or "all+".</para>
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<para>Support for <emphasis role="bold">all+</emphasis> was added in
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Shorewall 4.5.17. <emphasis role="bold">all</emphasis> does not
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override the implicit intra-zone ACCEPT policy while <emphasis
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role="bold">all+</emphasis> does.</para>
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<para>Beginning with Shorewall 5.0.12, multiple zones may be listed
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separated by commas. As above, if '+' is specified after two or more
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zone names, then the policy overrides the implicit intra-zone ACCEPT
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policy if the same <replaceable>zone</replaceable> appears in both
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the SOURCE and DEST columns.</para>
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<para>Beginning with Shorewall 5.2.3, a comma-separated list of
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excluded zones preceded by "!" may follow <emphasis
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role="bold">all</emphasis> or <emphasis
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role="bold">all+.</emphasis></para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">DEST</emphasis> -
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<emphasis>zone</emphasis>[,...[+]]|<emphasis
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role="bold">$FW</emphasis>|all[+][!<replaceable>ezone</replaceable>[,...]]</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="/manpages/shorewall-zones.html">shorewall-zones</ulink>(5),
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$FW, "all" or "all+". If the DEST is a bport zone, then the SOURCE
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must be "all", "all+", another bport zone associated with the same
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bridge, or it must be an ipv4 zone that is associated with only the
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same bridge.</para>
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<para>Support for "all+" was added in Shorewall 4.5.17. "all" does
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not override the implicit intra-zone ACCEPT policy while "all+"
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does.</para>
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<para>Beginning with Shorewall 5.0.12, multiple zones may be listed
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separated by commas. As above, if '+' is specified after two or more
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zone names, then the policy overrides the implicit intra-zone ACCEPT
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policy if the same <replaceable>zone</replaceable> appears in both
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the SOURCE and DEST columns.</para>
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<para>Beginning with Shorewall 5.2.3, a comma-separated list of
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excluded zones preceded by "!" may follow <emphasis
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role="bold">all</emphasis> or <emphasis
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role="bold">all+</emphasis>.</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">BLACKLIST</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>queuenumber1</emphasis>[:<replaceable>queuenumber2</replaceable>])]|<emphasis
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role="bold">NONE</emphasis>}[<emphasis
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role="bold">:</emphasis>{[+]<emphasis>policy-action</emphasis>[:level][,...]|<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="/manpages/shorewall.conf.html">shorewall.conf</ulink>(5) to
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be 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 with optional parameters enclosed in
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parentheses. The action will be invoked before the policy is
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enforced.</para>
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</listitem>
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</orderedlist>
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<para>Actions can have parameters specified.</para>
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<para>Beginning with Shorewall 4.5.10, the action name can be
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followed optionally by a colon and a log level. The level will be
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applied to each rule in the action or body that does not already
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have a log level.</para>
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<para>Beginning with Shorewall 5.1.2, multiple
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<replaceable>action</replaceable>[:<replaceable>level</replaceable>]
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specification may be listeded, separated by commas. The actions are
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invoked in the order listed. Also beginning with Shorewall 5.1.2,
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the policy-action list can be prefixed with a plus sign ("+")
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indicating that the listed actions are in addition to those listed
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in the related _DEFAULT setting in <ulink
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url="/manpages/shorewall.conf.html">shorewall.conf</ulink>(5).</para>
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<para>Possible policies are:</para>
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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">BLACKLIST</emphasis></term>
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<listitem>
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<para>Added in Shorewall 5.1.1 and requires that the
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DYNAMIC_BLACKLIST setting in <ulink
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url="/manpages/shorewall.conf.html">shorewall.conf</ulink>(5)
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specifies ipset-based dynamic blacklisting. The SOURCE IP
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address is added to the blacklist ipset and the connection
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request is ignored.</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>queuenumber1</replaceable> is not given, queue
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zero (0) is assumed. Beginning with Shorewall 4.6.10, a second
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queue number (queuenumber2) may be given. This specifies a
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range of queues to use. Packets are then balanced across the
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given queues. This is useful for multicore systems: start
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multiple instances of the userspace program on queues x, x+1,
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.. x+n and use "x:x+n". Packets belonging to the same
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connection are put into the same nfqueue.</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="/manpages/shorewall-nesting.html">shorewall-nesting</ulink>(5)
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for 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">LOGLEVEL</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>For a description of logging, see <ulink
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url="/shorewall_logging.html">shorewall-logging(5)</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">RATE</emphasis> (rate) -
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[-|<replaceable>limit</replaceable>]</term>
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<listitem>
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<para>where limit is one of:</para>
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<simplelist>
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<member>[<emphasis role="bold">-</emphasis>|[{<emphasis
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role="bold">s</emphasis>|<emphasis
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role="bold">d</emphasis>}[/<replaceable>vlsm</replaceable>]:[[<replaceable>name</replaceable>][(ht-buckets,ht-max)]:]]]<emphasis>rate</emphasis><emphasis
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role="bold">/</emphasis>{<emphasis
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role="bold">sec</emphasis>|<emphasis
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role="bold">min</emphasis>|<emphasis
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role="bold">hour</emphasis>|<emphasis
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role="bold">day</emphasis>}[:<emphasis>burst</emphasis>]</member>
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<member>[<replaceable>name</replaceable>1:]<emphasis>rate1</emphasis><emphasis
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role="bold">/</emphasis>{<emphasis
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role="bold">sec</emphasis>|<emphasis
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role="bold">min</emphasis>|<emphasis
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role="bold">hour</emphasis>|<emphasis
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role="bold">day</emphasis>}[:<emphasis>burst1</emphasis>],[<replaceable>name</replaceable>2:]<emphasis>rate2</emphasis><emphasis
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role="bold">/</emphasis>{<emphasis
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role="bold">sec</emphasis>|<emphasis
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role="bold">min</emphasis>|<emphasis
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role="bold">hour</emphasis>|<emphasis
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role="bold">day</emphasis>}[:<emphasis>burst2</emphasis>]</member>
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</simplelist>
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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 or rule specifies the same name, the connections counts for
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the policies are aggregated and the individual rates apply to the
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aggregated count. Beginning with Shorewall 5.2.1, the <emphasis
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role="bold">s</emphasis> or <emphasis role="bold">d</emphasis> may
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be followed by a slash ("/") and an integer
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<replaceable>vlsm</replaceable>. When a
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<replaceable>vlsm</replaceable> is specified, all source or
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destination addresses encountered will be grouped according to the
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given prefix length and the so-created subnet will be subject to the
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rate limit.</para>
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<para>Beginning with Shorewall 4.6.5, two<replaceable>
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limit</replaceable>s may be specified, separated by a comma. In this
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case, the first limit (<replaceable>name1</replaceable>,
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<replaceable>rate1</replaceable>, burst1) specifies the per-source
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IP limit and the second limit specifies the per-destination IP
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limit.</para>
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<para>Example: <emphasis
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role="bold">client:10/sec:20,:60/sec:100</emphasis></para>
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<para>Beginning with Shorewall 5.2.1, the table name, if any, may be
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followed by two integers separated by commas and enclosed in
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parentheses. The first integer
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(<replaceable>ht-buckets</replaceable>) specifies the number of
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buckets in the generated hash table. The second integer
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(<replaceable>ht-max</replaceable>) specifies the maximum number of
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entries in the hash table.</para>
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<para>Example: <emphasis
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role="bold">s:client(1024,65536):10/sec</emphasis></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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<para>/etc/shorewall6/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="/configuration_file_basics.htm#Pairs">http://www.shorewall.net/configuration_file_basics.htm#Pairs</ulink></para>
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<para>shorewall(8)</para>
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</refsect1>
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</refentry>
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