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Security talk: Fortifying your Joomla! website on J and Beyond 2010 |
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Written by Radek Suski
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Wednesday, 02 June 2010 |
Fortifying your Joomla! website - Security talk, held on the International Joomla! Conference "J and Beyond" on May 31, 2010 in Wiesbaden, Germany
 Joomla! .htaccess file example
##
# @version $Id: htaccess.txt 14401 2010-01-26 14:10:00Z louis $
# @package Joomla
# @copyright Copyright (C) 2005 - 2010 Open Source Matters. All rights reserved.
# @license http://www.gnu.org/copyleft/gpl.html GNU/GPL
# Joomla! is Free Software
#####################################################
# Modified by Radek Suski (@RS) Sigsiu.NET GmbH
# Email: sobi[at]sigsiu.net
# Url: http://www.Sigsiu.NET
# Version 1.0
#####################################################
#####################################################
# READ THIS COMPLETELY IF YOU CHOOSE TO USE THIS FILE
#
# The line just below this section: 'Options +FollowSymLinks' may cause problems
# with some server configurations. It is required for use of mod_rewrite, but may already
# be set by your server administrator in a way that dissallows changing it in
# your .htaccess file. If using it causes your server to error out, comment it out (add # to
# beginning of line), reload your site in your browser and test your sef url's. If they work,
# it has been set by your server administrator and you do not need it set here.
#
#####################################################
## Can be commented out if causes errors, see notes above.
Options +FollowSymLinks
#
# mod_rewrite in use
# Uncomment following line if your webserver's URL
# is not directly related to physical file paths.
# Update Your Joomla! Directory (just / for root)
RewriteEngine On
########## Begin - Rewrite rules to block out some common exploits
## If you experience problems on your site block out the operations listed below
## This attempts to block the most common type of exploit `attempts` to Joomla!
#
## End of deny access to extension xml files
#### @RS if the request contains /proc/self/environ
RewriteCond %{QUERY_STRING} proc\/self\/environ [OR]
#### @RS
RewriteCond %{QUERY_STRING} mosConfig_[a-zA-Z_]{1,21}(=|\%3D) [OR]
# Block out any script trying to base64_encode crap to send via URL
RewriteCond %{QUERY_STRING} base64_encode.*\(.*\) [OR]
# Block out any script that includes a <script> tag in URL
RewriteCond %{QUERY_STRING} (\<|%3C).*script.*(\>|%3E) [NC,OR]
# Block out any script trying to set a PHP GLOBALS variable via URL
RewriteCond %{QUERY_STRING} GLOBALS(=|\[|\%[0-9A-Z]{0,2}) [OR]
# Block out any script trying to modify a _REQUEST variable via URL
RewriteCond %{QUERY_STRING} _REQUEST(=|\[|\%[0-9A-Z]{0,2})
# Send all blocked request to homepage with 403 Forbidden error!
RewriteRule ^(.*)$ index.php [F,L]
#
########## End - Rewrite rules to block out some common exploits
#### @RS
# File injection
# May cause problems !!!!
RewriteCond %{REQUEST_METHOD} GET
RewriteCond %{QUERY_STRING} [a-zA-Z0-9_]\=http:\/\/(.*)
RewriteRule ^(.*)$ index.php [F,L]
#### @RS
#### @RS
# Deny access to php, xml and ini files
# within components and plugins directories
RewriteCond %{REQUEST_FILENAME} -f
RewriteCond %{REQUEST_URI} \.php|\.ini|\.xml [NC]
RewriteCond %{REQUEST_URI} \/components\/ [OR]
RewriteCond %{REQUEST_URI} ^\/includes\/|^\/administrator\/includes\/ [OR]
RewriteCond %{REQUEST_URI} \/language\/ [OR]
RewriteCond %{REQUEST_URI} \/libraries\/ [OR]
RewriteCond %{REQUEST_URI} \/modules\/ [OR]
RewriteCond %{REQUEST_URI} \/plugins\/ [OR]
RewriteCond %{REQUEST_URI} \/templates\/ [OR]
RewriteCond %{REQUEST_URI} \/xmlrpc\/
RewriteRule ^(.*)$ index.php [R=404,L]
#### @RS
#### @RS
# Prevent most common SQL-Injections
RewriteCond %{query_string} concat.*\( [NC,OR]
RewriteCond %{query_string} union.*select.*\( [NC,OR]
RewriteCond %{query_string} union.*all.*select [NC]
RewriteRule ^(.*)$ index.php [F,L]
#### @RS
########## Begin - Joomla! core SEF Section
#
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !^/index.php
RewriteCond %{REQUEST_URI} (/|\.php|\.html|\.htm|\.feed|\.pdf|\.raw|/[^.]*)$ [NC]
RewriteRule (.*) index.php
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]
#
########## End - Joomla! core SEF Section
#### @RS
# Block most common hacking tools
SetEnvIf user-agent "Indy Library" stayout=1
SetEnvIf user-agent "libwww-perl" stayout=1
SetEnvIf user-agent "Wget" stayout=1
deny from env=stayout
#### @RS
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