Tag: Fail2ban

Centos fail2ban error

18/08/2014

With the latest version of Fail2ban I got this error on some Centos servers that Fail2ban would not start anymore.

This is the quick fix:

Add to your jail.conf:

[DEFAULT]

backend=gamin

[DEFAULT]

backend=gamin

Found the above solution here: https://github.com/fail2ban/fail2ban/issues/44

Fail2ban and wordpress

25/07/2014

If you use fail2ban on your server and you are running WordPress you could use this plugin:

https://wordpress.org/plugins/wp-fail2ban/

“WP fail2ban logs all login attempts, whether successful or not, to syslog using LOG_AUTH.”

So now when kiddies try to “hack” your login page, Fail2Ban will kick in and do its job.

wordpress.conf:

# Fail2Ban configuration file
#
# Author: Charles Lecklider
#

[INCLUDES]

# Read common prefixes. If any customizations available -- read them from
# common.local
before = common.conf


[Definition]

_daemon = wordpress

# Option:  failregex
# Notes.:  regex to match the password failures messages in the logfile. The
#          host must be matched by a group named "host". The tag "<HOST>" can
#          be used for standard IP/hostname matching and is only an alias for
#          (?:::f{4,6}:)?(?P<host>[\w\-.^_]+)
# Values:  TEXT
#
failregex = ^%(__prefix_line)sAuthentication failure for .* from <HOST>$

# Option:  ignoreregex
# Notes.:  regex to ignore. If this regex matches, the line is ignored.
# Values:  TEXT
#
ignoreregex =

# Fail2Ban configuration file

# Author: Charles Lecklider

[INCLUDES]

# Read common prefixes. If any customizations available -- read them from

# common.local

before = common.conf

[Definition]

_daemon = wordpress

# Option: failregex

# Notes.: regex to match the password failures messages in the logfile. The

# host must be matched by a group named "host". The tag "<HOST>" can

# be used for standard IP/hostname matching and is only an alias for

# (?:::f{4,6}:)?(?P<host>[\w\-.^_]+)

# Values: TEXT

failregex = ^%(__prefix_line)sAuthentication failure for .* from <HOST>$

# Option: ignoreregex

# Notes.: regex to ignore. If this regex matches, the line is ignored.

# Values: TEXT

ignoreregex =

WP fail2ban plugin:

<?php
/*
Plugin Name: WP fail2ban
Plugin URI: https://charles.lecklider.org/wordpress/wp-fail2ban/
Description: Write all login attempts to syslog for integration with fail2ban.
Version: 1.2.1
Author: Charles Lecklider
Author URI: https://charles.lecklider.org/
License: GPL2
*/

/*  Copyright 2012-13  Charles Lecklider  (email : wordpress@charles.lecklider.org)

    This program is 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 Free Software Foundation.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/


add_action( 'wp_login',
			function($user_login, $user)
			{
				openlog('wordpress('.$_SERVER['HTTP_HOST'].')',LOG_NDELAY|LOG_PID,LOG_AUTH);
				syslog(LOG_INFO,"Accepted password for $user_login from {$_SERVER['REMOTE_ADDR']}");
			},10,2);
add_action( 'wp_login_failed',
			function($username)
			{
				openlog('wordpress('.$_SERVER['HTTP_HOST'].')',LOG_NDELAY|LOG_PID,LOG_AUTH);
				syslog(LOG_NOTICE,"Authentication failure for $username from {$_SERVER['REMOTE_ADDR']}");
			});

<?php

Plugin Name: WP fail2ban

Plugin URI: https://charles.lecklider.org/wordpress/wp-fail2ban/

Description: Write all login attempts to syslog for integration with fail2ban.

Version: 1.2.1

Author: Charles Lecklider

Author URI: https://charles.lecklider.org/

License: GPL2

This program is 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 Free Software Foundation.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

add_action( 'wp_login',

function($user_login, $user)

{

openlog('wordpress('.$_SERVER['HTTP_HOST'].')',LOG_NDELAY|LOG_PID,LOG_AUTH);

syslog(LOG_INFO,"Accepted password for $user_login from {$_SERVER['REMOTE_ADDR']}");

},10,2);

add_action( 'wp_login_failed',

function($username)

{

openlog('wordpress('.$_SERVER['HTTP_HOST'].')',LOG_NDELAY|LOG_PID,LOG_AUTH);

syslog(LOG_NOTICE,"Authentication failure for $username from {$_SERVER['REMOTE_ADDR']}");

});