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2002-09-16 19:02:45 +02:00
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<title>Blacklisting Support</title>
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<body>
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<table border="0" cellpadding="0" cellspacing="0"
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style="border-collapse: collapse;" bordercolor="#111111" width="100%"
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<tbody>
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<tr>
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<td width="100%">
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<h1 align="center"><font color="#ffffff">Blacklisting Support</font></h1>
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</tr>
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</tbody>
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</table>
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<p>Shorewall supports two different forms of blacklisting; static and dynamic.</p>
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<h2>Static Blacklisting</h2>
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<p>Shorewall static blacklisting support has the following configuration
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parameters:</p>
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<ul>
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<li>You specify whether you want packets from blacklisted hosts dropped
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or rejected using the <a href="Documentation.htm#BLDisposition">BLACKLIST_DISPOSITION</a>
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setting in /etc/shorewall/shorewall.conf</li>
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<li>You specify whether you want packets from blacklisted hosts logged
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and at what syslog level using the <a
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href="Documentation.htm#BLLoglevel">BLACKLIST_LOGLEVEL</a> setting in
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/etc/shorewall/shorewall.conf</li>
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<li>You list the IP addresses/subnets that you wish to blacklist in
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<a href="Documentation.htm#Blacklist">/etc/shorewall/blacklist.</a> Beginning
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with Shorewall version 1.3.8, you may also specify PROTOCOL and Port numbers/Service
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names in the blacklist file.<br>
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</li>
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<li>You specify the interfaces whose incoming packets you want checked
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against the blacklist using the "<a
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href="Documentation.htm#Interfaces">blacklist</a>" option in /etc/shorewall/interfaces.</li>
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<li>The black list is refreshed from /etc/shorewall/blacklist by the
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"<a href="Documentation.htm#Starting">shorewall refresh</a>" command.</li>
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</ul>
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<h2>Dynamic Blacklisting</h2>
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<p>Dynamic blacklisting support was added in version 1.3.2. Dynamic blacklisting
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doesn't use any configuration parameters but is rather controlled using
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/sbin/shorewall commands:</p>
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<ul>
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<li>drop <i><ip address list> </i>- causes packets from the listed
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IP addresses to be silently dropped by the firewall.</li>
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<li>reject <i><ip address list> </i>- causes packets from the
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listed IP addresses to be rejected by the firewall.</li>
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<li>allow <i><ip address list> </i>- re-enables receipt of packets
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from hosts previously blacklisted by a <i>deny</i> or <i>reject</i> command.</li>
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<li>save - save the dynamic blacklisting configuration so that it will
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be automatically restored the next time that the firewall is restarted.</li>
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<li>show dynamic - displays the dynamic blacklisting configuration.</li>
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</ul>
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Dynamic blacklisting is <u>not</u> dependent on the "blacklist" option in
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/etc/shorewall/interfaces.<br>
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<p>Example 1:</p>
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<pre> <b><font color="#009900">shorewall drop 192.0.2.124 192.0.2.125</font></b></pre>
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<p><EFBFBD><EFBFBD><EFBFBD> Drops packets from hosts 192.0.2.124 and 192.0.2.125</p>
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<p>Example 2:</p>
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<pre> <b><font color="#009900">shorewall allow 192.0.2.125</font></b></pre>
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<p><EFBFBD><EFBFBD><EFBFBD> Reenables access from 192.0.2.125.</p>
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<p><font size="2">Last updated 2/7/2003 - <a href="support.htm">Tom Eastep</a></font></p>
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<p><font face="Trebuchet MS"><a href="copyright.htm"><font size="2">Copyright</font>
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<20> <font size="2">2002, 2003 Thomas M. Eastep.</font></a></font></p>
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<br>
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<br>
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<br>
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</body>
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</html>
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