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325 lines
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325 lines
12 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-blrules</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>blrules</refname>
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<refpurpose>shorewall Blacklist file</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>/etc/shorewall/blrules</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 is used to perform blacklisting and whitelisting.</para>
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<para>Rules in this file are applied depending on the setting of
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BLACKLISTNEWONLY in <ulink
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url="shorewall.conf.html">shorewall.conf</ulink>(5). If
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BLACKLISTNEWONLY=No, then they are applied regardless of the connection
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tracking state of the packet. If BLACKLISTNEWONLY=Yes, they are applied to
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connections in the NEW and INVALID states.</para>
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<para>The format of rules in this file is the same as the format of rules
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in <ulink url="shorewall-rules.html">shorewall-rules (5)</ulink>. The
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differece in the two files lies in the ACTION (first) column.</para>
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<variablelist>
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<varlistentry>
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<term><emphasis role="bold">ACTION- {<emphasis
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role="bold">ACCEPT</emphasis>|CONTINUE|DROP|A_DROP|REJECT|A_REJECT|<emphasis
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role="bold">WHITELIST</emphasis>|<emphasis
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role="bold">LOG</emphasis>|<emphasis
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role="bold">QUEUE</emphasis>|<emphasis
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role="bold">NFQUEUE</emphasis>[<emphasis
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role="bold">(</emphasis><emphasis>queuenumber</emphasis><emphasis
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role="bold">)</emphasis>]<emphasis
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role="bold">|COMMENT</emphasis>|<emphasis>action</emphasis>|<emphasis>macro</emphasis>[<emphasis
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role="bold">(</emphasis><emphasis>target</emphasis><emphasis
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role="bold">)</emphasis>]}<emphasis
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role="bold">[:</emphasis>{<emphasis>log-level</emphasis>|<emphasis
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role="bold">none</emphasis>}[<emphasis role="bold"><emphasis
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role="bold">!</emphasis></emphasis>][<emphasis
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role="bold">:</emphasis><emphasis>tag</emphasis>]]</emphasis></term>
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<listitem>
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<para>Specifies the action to be taken if the packet matches the
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rule. Must be one of the following.</para>
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<variablelist>
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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 4.5.3. This is actually a macro that
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expands as follows:</para>
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<itemizedlist>
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<listitem>
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<para>If BLACKLIST_LOGLEVEL is specified in <ulink
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url="shorewall.conf.html">shorewall.conf</ulink>(5), then
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the macro expands to <emphasis
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role="bold">blacklog</emphasis>.</para>
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</listitem>
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<listitem>
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<para>Otherwise it expands to the action specified for
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BLACKLIST_DISPOSITION in <ulink
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url="shorewall.conf.html">shorewall.conf</ulink>(5).</para>
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</listitem>
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</itemizedlist>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">blacklog</emphasis></term>
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<listitem>
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<para>May only be used if BLACKLIST_LOGLEVEL is specified in
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<ulink url="shorewall.conf.html">shorewall.conf </ulink>(5).
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Logs, audits (if specified) and applies the
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BLACKLIST_DISPOSITION specified in <ulink
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url="shorewall.conf.html">shorewall.conf</ulink> (5).</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis
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role="bold">ACCEPT|CONTINUE|WHITELIST</emphasis></term>
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<listitem>
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<para>Exempt the packet from the remaining rules in this
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file.</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 packet.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>A_DROP and A_DROP!</term>
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<listitem>
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<para>Audited versions of DROP. Requires AUDIT_TARGET support
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in the kernel and ip6tables.</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>disallow the packet and return an icmp-unreachable or an
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RST packet.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>A_REJECT</term>
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<listitem>
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<para>Audited versions of REJECT. Require AUDIT_TARGET support
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in the kernel and ip6tables.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">LOG</emphasis></term>
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<listitem>
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<para>Simply log the packet and continue with the next
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rule.</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 packet to a user-space application such as
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ftwall (http://p2pwall.sf.net). The application may reinsert
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the packet for further processing.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis
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role="bold">NFLOG</emphasis>[(<replaceable>nflog-parameters</replaceable>)]</term>
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<listitem>
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<para>queues matching packets to a backend logging daemon via
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a netlink socket then continues to the next rule. See <ulink
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url="http://www.shorewall.net/shorewall.logging.html">http://www.shorewall.net/shorewall_logging.html</ulink>.</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>Queues the packet to a user-space application using the
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nfnetlink_queue mechanism. If a
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<replaceable>queuenumber</replaceable> is not specified, 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">COMMENT</emphasis></term>
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<listitem>
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<para>the rest of the line will be attached as a comment to
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the Netfilter rule(s) generated by the following entries. The
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comment will appear delimited by "/* ... */" in the output of
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"shorewall show <chain>". To stop the comment from being
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attached to further rules, simply include COMMENT on a line by
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itself.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis>action</emphasis></term>
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<listitem>
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<para>The name of an <emphasis>action</emphasis> declared in
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<ulink
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url="shorewall-actions.html">shorewall-actions</ulink>(5) or
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in /usr/share/shorewall/actions.std.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis>macro</emphasis></term>
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<listitem>
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<para>The name of a macro defined in a file named
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macro.<emphasis>macro</emphasis>. If the macro accepts an
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action parameter (Look at the macro source to see if it has
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PARAM in the TARGET column) then the
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<emphasis>macro</emphasis> name is followed by the
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parenthesized <emphasis>target</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>, ...) to be substituted for the
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parameter.</para>
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<para>Example: FTP(ACCEPT).</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>The <emphasis role="bold">ACTION</emphasis> may optionally be
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followed by ":" and a syslog log level (e.g, REJECT:info or
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Web(ACCEPT):debug). This causes the packet to be logged at the
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specified level.</para>
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<para>If the <emphasis role="bold">ACTION</emphasis> names an
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<emphasis>action</emphasis> declared in <ulink
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url="shorewall-actions.html">shorewall-actions</ulink>(5) or in
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/usr/share/shorewall/actions.std then:</para>
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<itemizedlist>
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<listitem>
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<para>If the log level is followed by "!' then all rules in the
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action are logged at the log level.</para>
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</listitem>
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<listitem>
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<para>If the log level is not followed by "!" then only those
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rules in the action that do not specify logging are logged at
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the specified level.</para>
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</listitem>
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<listitem>
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<para>The special log level <emphasis
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role="bold">none!</emphasis> suppresses logging by the
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action.</para>
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</listitem>
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</itemizedlist>
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<para>You may also specify <emphasis role="bold">NFLOG</emphasis>
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(must be in upper case) as a log level.This will log to the NFLOG
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target for routing to a 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>Actions specifying logging may be followed by a log tag (a
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string of alphanumeric characters) which is appended to the string
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generated by the LOGPREFIX (in <ulink
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url="shorewall.conf.html">shorewall.conf</ulink>(5)).</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>For the remaining columns, see <ulink
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url="shorewall-rules.html">shorewall-rules (5)</ulink>.</para>
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</refsect1>
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<refsect1>
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<title>Example</title>
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<variablelist>
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<varlistentry>
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<term>Example 1:</term>
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<listitem>
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<para>Drop Teredo packets from the net.</para>
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<programlisting>DROP net:[2001::/32] all</programlisting>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>Example 2:</term>
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<listitem>
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<para>Don't subject packets from 2001:DB8::/64 to the remaining
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rules in the file.</para>
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<programlisting>WHITELIST net:[2001:DB8::/64] all</programlisting>
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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/blrules</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/blacklisting_support.htm">http://shorewall.net/blacklisting_support.htm</ulink></para>
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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-hosts(5), shorewall-interfaces(5), shorewall-maclist(5),
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shoewall6-netmap(5),shorewall-params(5), shorewall-policy(5),
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shorewall-providers(5), shorewall-rtrules(5), shorewall-routestopped(5),
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shorewall-rules(5), shorewall.conf(5), shorewall-secmarks(5),
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shorewall-tcclasses(5), shorewall-tcdevices(5), shorewall-tcrules(5),
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shorewall-tos(5), shorewall-tunnels(5), shorewall-zones(5)</para>
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</refsect1>
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</refentry>
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