Apache

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Apache HTTP Server is a free software/open source web server for Unix-like systems, Microsoft Windows, Novell NetWare and other operating systems. Apache is notable for playing a key role in the initial growth of the World Wide Web, and continues to be the most popular web server in use, serving as the de facto reference platform against which other web servers are designed and judged.

From Wikipedia, the free encyclopedia



  • [Sun Jan 28 11:55:32 2007] [error] [client 123.123.123.123] user myCoolUser: authentication failure for "/myPasswordedDir": Password Mismatch
  • [Tue Apr 10 15:39:26 2007] [error] [client x.x.x.x] Digest: user Username: password mismatch: /
  • [Tue Jan 27 15:32:40 2009] [error] [client 192.0.2.1] client denied by server configuration: /var/www/apache2-default/nonexistingpage.html


Failregex

The regular expressions below are proposed failregex for this software. Multiple regular expressions for failregex will only work with a version of Fail2ban greater than or equal to 0.7.6.

The tag <HOST> in the regular expressions below is just an alias for (?:::f{4,6}:)?(?P<host>\S+). The replacement is done automatically by Fail2ban when adding the regular expression. At the moment, exactly one named group host or <HOST> tag must be present in each regular expression.

Please, before editing this section, propose your changes in the discussion page first.


Authentication failure (doesn't it match to many cases ?):

  • [[]client <HOST>[]] user .*(?:: authentication failure|not found|password mismatch)

Forbidden access:

* ^\[[^\]]*\]\s+\[error\]\s+\[client <HOST>\] client denied by server configuration:

PHP

If you don't have PHP service running or do not expect so many 'File does not exist' logging in Apache's error log, for attempts to log into some admin modus as shown below, you can also ban these IPs.

  • [Sat Mar 15 03:08:59 2008] [error] [client xyz.246.51.abc] File does not exist: /var/www/blabla/sqladmin/main.php
  • [Sat Mar 15 03:08:59 2008] [error] [client xyz.246.51.abc] File does not exist: /var/www/blabla/php/main.php
  • [Sat Mar 15 03:08:59 2008] [error] [client xyz.246.51.abc] File does not exist: /var/www/blabla/myadmin/main.php

This can be done by using the following regex in an extra Apache section in fail2ban.conf:

failregex = [[]client (?P<host>\S*)[]] File does not exist: .*\.php

A more comprehensive example for a Apache with PHP on Linux, running PHPBB, but without PHPmyAdmin, cgi, perl:

failregex = [[]client <HOST>[]] (File does not exist|script not found or unable to stat): .*/(cgi-bin|admin|Admin|sql|mail|phpmyadmin|file:|php|pma|web|PMA|PMA2006|pma2006|sqlmanager|mysqlmanager|PMA2005|phpmyadmin-old|phpmyadminold|pma2005|phpmanager|mysql|myadmin|webadmin|sqlweb|websql|webdb|mysqladmin|mysql-admin|phpmyadmin2|phpMyAdmin2|phpMyAdmin-2|php-my-admin|cms|clan|site|seite|page|forum|wbb2|board|wbb|archive|forumv2|forumv1|b0ard|f0rum|wbb1|wbb3|wbblite|directforum|board23|board2|board3|WBB|WBB2|html|phpkit|page|phpkit_1.6.1|clan|myadmin|webadmin|sqlweb|websql|webdb|mysqladmin|mysql-admin|phpmyadmin2|php-my-admin|phpMyAdmin-2.2.3|phpMyAdmin-2.2.6|phpMyAdmin-2.5.1|phpMyAdmin-2.5.4|phpMyAdmin-2.5.6|phpMyAdmin-2.6.0|phpMyAdmin-2.6.0-pl1|phpMyAdmin-2.6.2-rc1|phpMyAdmin-2.6.3|phpMyAdmin-2.6.3-pl1|phpMyAdmin-2.6.3-rc1|padmin|datenbank|database|horde|horde2|horde3|horde-3.0.9|Horde|README|horde-3.0.9|adserver|phpAdsNew|phpadsnew|phpads|Ads|ads|xmlrpc|xmlsrv|blog|drupal|community|blogs|blogtest|appserver|roundcube|rc|mail|mail2|roundcubemail|rms|webmail2|webmail|wm|bin|roundcubemail-0.1|roundcubemail-0.2|roundcube-0.1|roundcube-0.2|roun|cube|wp-login.php|ucp.php|\.asp|\.dll|\.exe|\.pl)

To block certain WordPress and other PHP related vulnerabilities, a failregex may be added to one of the apache filters (filter.d/apache-auth.conf for example):

  • [[]client <HOST>[]] PHP Notice:.*(Undefined variable: HTTP_.*_VARS in|Use of undefined constant include_path).*
  • [[]client <HOST>[]] PHP Deprecated:.*(Function set_magic_quotes_runtime\(\) is deprecated in|Assigning the return value of new by reference is deprecated in).*

Centos

Under CentOS / RedHat Enterprise Linux, httpd (Apache) is not compiled with tcpwrappers support. As a result the example in jail.conf called "apache-tcpwrapper" does not work since /etc/hosts.deny does not affect apache.

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