<!-- @(#) $Id: named_rules.xml,v 1.22 2010/03/04 20:12:33 dcid Exp $
  -  Example of Named rules for OSSEC.
  -
  -  Copyright (C) 2009 Trend Micro Inc.
  -  All rights reserved.
  -
  -  This program is a free software; you can redistribute it
  -  and/or modify it under the terms of the GNU General Public
  -  License (version 2) as published by the FSF - Free Software
  -  Foundation.
  -
  -  License details: http://www.ossec.net/en/licensing.html
  -->


<group name="syslog,named,">
  <rule id="12100" level="0" noalert="1">
    <decoded_as>named</decoded_as>
    <description>Grouping of the named rules</description>
  </rule>
  
  <rule id="12101" level="12">
    <if_sid>12100</if_sid>
    <match>dropping source port zero packet from</match>
    <description>Invalid DNS packet. Possibility of attack.</description>
    <group>invalid_access,</group>
  </rule>

  <rule id="12102" level="9">
    <if_sid>12100</if_sid>
    <match>denied AXFR from</match>
    <description>Failed attempt to perform a zone transfer.</description>
    <group>access_denied,</group>
  </rule>

  <rule id="12103" level="4">
    <if_sid>12100</if_sid>
    <match>denied update from|unapproved update from</match>
    <description>DNS update denied. </description>
    <description>Generally mis-configuration.</description>
    <info type="link">http://seclists.org/incidents/2000/May/217</info>
    <group>client_misconfig,</group>
  </rule>

  <rule id="12104" level="4">
    <if_sid>12100</if_sid>
    <match>unable to rename log file</match>
    <description>Log permission misconfiguration in Named.</description>
    <group>system_error,</group>
  </rule>

  <rule id="12105" level="4">
    <if_sid>12100</if_sid>
    <match>unexpected RCODE </match>
    <description>Unexpected error while resolving domain.</description>
  </rule>  

  <rule id="12106" level="4">
    <if_sid>12100</if_sid>
    <match>refused notify from non-master</match>
    <description>DNS configuration error.</description>
  </rule>

  <rule id="12107" level="0">
    <if_sid>12100</if_sid>
    <regex>update \S+ denied</regex>
    <description>DNS update using RFC2136 Dynamic protocol.</description>
    <!-- <info>http://www.isc.org/index.pl?/sw/bind/FAQ.php</info> dead link, and don't know what the issue is with this -->
  </rule>

  <rule id="12108" level="4">
    <if_sid>12100</if_sid>
    <match>query (cache) denied</match>
    <description>Query cache denied (maybe config error).</description>
    <info type="link">http://www.reedmedia.net/misc/dns/errors.html</info>
  </rule>
  
  <rule id="12109" level="12">
    <if_sid>12100</if_sid>
    <match>exiting (due to fatal error)</match>
    <description>Named fatal error. DNS service going down.</description>
    <group>service_availability,</group>
  </rule>

  <rule id="12110" level="8">
    <regex>^zone \S+ serial number \S+ received from master </regex>
    <regex>\S+ \S ours (\S+)</regex>
    <description>Serial number from master is lower </description>
    <description>than stored.</description>
    <group>system_error,</group>
  </rule>
  
  <rule id="12111" level="8">
    <regex>^transfer of \S+ from \S+ failed while receiving \S+ REFUSED</regex>
    <description>Unable to perform zone transfer.</description>
    <group>system_error,</group>
  </rule>

  <rule id="12112" level="4">
    <regex>^zone \S+: expired</regex>
    <description>Zone transfer error.</description>
  </rule>
  
</group> <!-- SYSLOG,NAMED -->