mirror of
https://gitlab.com/shorewall/code.git
synced 2024-11-30 03:23:47 +01:00
180 lines
6.9 KiB
XML
180 lines
6.9 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
|
|
<article>
|
|
<!--$Id$-->
|
|
|
|
<articleinfo>
|
|
<title>Shorewall Blacklisting/Whitelisting Support</title>
|
|
|
|
<authorgroup>
|
|
<author>
|
|
<firstname>Tom</firstname>
|
|
|
|
<surname>Eastep</surname>
|
|
</author>
|
|
</authorgroup>
|
|
|
|
<pubdate><?dbtimestamp format="Y/m/d"?></pubdate>
|
|
|
|
<copyright>
|
|
<year>2002-2006</year>
|
|
|
|
<year>2010</year>
|
|
|
|
<year>2011</year>
|
|
|
|
<holder>Thomas M. Eastep</holder>
|
|
</copyright>
|
|
|
|
<legalnotice>
|
|
<para>Permission is granted to copy, distribute and/or modify this
|
|
document under the terms of the GNU Free Documentation License, Version
|
|
1.2 or any later version published by the Free Software Foundation; with
|
|
no Invariant Sections, with no Front-Cover, and with no Back-Cover
|
|
Texts. A copy of the license is included in the section entitled
|
|
<quote><ulink url="GnuCopyright.htm">GNU Free Documentation
|
|
License</ulink></quote>.</para>
|
|
</legalnotice>
|
|
</articleinfo>
|
|
|
|
<caution>
|
|
<para><emphasis role="bold">This article applies to Shorewall 4.4 and
|
|
later. If you are running a version of Shorewall earlier than Shorewall
|
|
4.3.5 then please see the documentation for that
|
|
release.</emphasis></para>
|
|
</caution>
|
|
|
|
<section id="Intro">
|
|
<title>Introduction</title>
|
|
|
|
<para>Shorewall supports two different types of blackliisting; rule-based,
|
|
static and dynamic. The BLACKLIST option in /etc/shorewall/shorewall.conf
|
|
controls the degree of blacklist filtering.</para>
|
|
|
|
<para>The BLACKLIST option lists the Netfilter connection-tracking states
|
|
that blacklist rules are to be applied to (states are NEW, ESTABLISHED,
|
|
RELATED, INVALID, NOTRACK). The BLACKLIST option supersedes the
|
|
BLACKLISTNEWONLY option:</para>
|
|
|
|
<orderedlist>
|
|
<listitem>
|
|
<para>BLACKLISTNEWONLY=No -- All incoming packets are checked against
|
|
the blacklist. New blacklist entries can be used to terminate existing
|
|
connections.</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>BLACKLISTNEWONLY=Yes -- The blacklists are only consulted for
|
|
new connection requests. Blacklists may not be used to terminate
|
|
existing connections.</para>
|
|
</listitem>
|
|
</orderedlist>
|
|
|
|
<important>
|
|
<para>For automatic blacklisting based on exceeding defined threshholds,
|
|
see <ulink url="Events.html">Events</ulink>.</para>
|
|
</important>
|
|
</section>
|
|
|
|
<section>
|
|
<title>Rule-based Blacklisting</title>
|
|
|
|
<para>Beginning with Shorewall 4.4.25, the preferred method of
|
|
blacklisting and whitelisting is to use the blrules file (<ulink
|
|
url="manpages/shorewall-blrules.html">shorewall-blrules</ulink> (5)).
|
|
There you have access to the DROP, ACCEPT, REJECT and WHITELIST actions,
|
|
standard and custom macros as well as standard and custom actions. See
|
|
<ulink url="manpages/shorewall-rules.html">shorewall-blrules</ulink> (5)
|
|
for details.</para>
|
|
|
|
<para>Example:</para>
|
|
|
|
<programlisting>#ACTION SOURCE DEST PROTO DPORT
|
|
|
|
WHITELIST net:70.90.191.126 all
|
|
DROP net all udp 1023:1033,1434,5948,23773
|
|
DROP all net udp 1023:1033
|
|
DROP net all tcp 57,1433,1434,2401,2745,3127,3306,3410,4899,5554,5948,6101,8081,9898,23773
|
|
DROP net:221.192.199.48 all
|
|
DROP net:61.158.162.9 all
|
|
DROP net:81.21.54.100 all tcp 25
|
|
DROP net:84.108.168.139 all
|
|
DROP net:200.55.14.18 all
|
|
</programlisting>
|
|
|
|
<para>Beginning with Shorewall 4.4.26, the <command>update</command>
|
|
command supports a <option>-b</option> option that causes your legacy
|
|
blacklisting configuration to use the blrules file.</para>
|
|
</section>
|
|
|
|
<section>
|
|
<title>Dynamic Blacklisting</title>
|
|
|
|
<para>Beginning with Shorewall 4.4.7, dynamic blacklisting is enabled by
|
|
setting DYNAMIC_BLACKLIST=Yes in <filename>shorewall.conf</filename>.
|
|
Prior to that release, the feature is always enabled.</para>
|
|
|
|
<para>Once enabled, dynamic blacklisting doesn't use any configuration
|
|
parameters but is rather controlled using /sbin/shorewall[-lite] commands.
|
|
<emphasis role="bold">Note</emphasis> that <emphasis
|
|
role="bold">to</emphasis> and <emphasis role="bold">from</emphasis> may
|
|
only be specified when running <emphasis role="bold">Shorewall 4.4.12 or
|
|
later</emphasis>.</para>
|
|
|
|
<itemizedlist>
|
|
<listitem>
|
|
<para>drop [to|from] <emphasis><ip address list></emphasis> -
|
|
causes packets from the listed IP addresses to be silently dropped by
|
|
the firewall.</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>reject [to|from]<emphasis><ip address list></emphasis> -
|
|
causes packets from the listed IP addresses to be rejected by the
|
|
firewall.</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>allow [to|from] <emphasis><ip address list></emphasis> -
|
|
re-enables receipt of packets from hosts previously blacklisted by a
|
|
<emphasis>drop</emphasis> or <emphasis>reject</emphasis>
|
|
command.</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>save - save the dynamic blacklisting configuration so that it
|
|
will be automatically restored the next time that the firewall is
|
|
restarted.</para>
|
|
|
|
<para><emphasis role="bold">Update:</emphasis> Beginning with
|
|
Shorewall 4.4.10, the dynamic blacklist is automatically retained over
|
|
<command>stop/start</command> sequences and over
|
|
<command>restart</command> and <emphasis
|
|
role="bold">reload</emphasis>.</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>show dynamic - displays the dynamic blacklisting
|
|
configuration.</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>logdrop [to|from] <emphasis><ip address list></emphasis> -
|
|
causes packets from the listed IP addresses to be dropped and logged
|
|
by the firewall. Logging will occur at the level specified by the
|
|
BLACKLIST_LOGLEVEL setting at the last [re]start (logging will be at
|
|
the 'info' level if no BLACKLIST_LOGLEVEL was given).</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>logreject [to|from}<emphasis><ip address list></emphasis>
|
|
- causes packets from the listed IP addresses to be rejected and
|
|
logged by the firewall. Logging will occur at the level specified by
|
|
the BLACKLIST_LOGLEVEL setting at the last [re]start (logging will be
|
|
at the 'info' level if no BLACKLIST_LOGLEVEL was given).</para>
|
|
</listitem>
|
|
</itemizedlist>
|
|
</section>
|
|
</article>
|