Archive

Articles taggués ‘htaccess’

How to Restrict IP Addresses from Accessing your Web Server using .htaccess

07/04/2016 Comments off

If you are running the Apache Web Server or your web hosting provider running Apache based web server, you can use .htaccess configuration file to restrict access to your website. This could be a very important issue from security stand point of view especially if your server is being attacked or hacked from any specific or range of IP addresses.

Now, restricting access method works in two ways. First, you can restrict access to certain IP addresses and allow others. Second, you can restrict access to everyone but few IP addresses only. On this post, I will focus on both method and will try to explain as much as I can.

Restrict Certain IP Addresses

If you want to restrict specific IP addresses from accessing your site, you can use the following lines on your .htaccess file.

order deny,allow
deny from 123.4.5.6
deny from 654.3.2.1
allow from all

These lines above will block “123.4.5.6” and “654.3.2.1” IP addresses from accessing your site. You can add as many IP addresses as you want on this “deny from” list. One interesting fact is, Apache web server gives you lot more flexibility in terms of blocking IP addresses. Take a look at the following lines.

order deny,allow
deny from 123.4.5.
allow from all

If you observe it carefully, you will see that the fourth set of digit is missing on this IP address. It means, if any IP address that matches the first three set of digits will be blocked. So basically anyone with IP address like “123.4.5.1” or “123.4.5.244” won’t be able to access your site as in both IP address matches with the first three (123.4.5.) sets of digits blocked by the Apache web server.

Allow Specific IP Addresses

Think of about a site that you built for a very specific purpose and for very few people, where you do not want everyone to show up. Apache allows you to do that as well.

For an example, lets assume that you built a site that you want one of your friend to be able to access and his IP address is “123.4.5.12”. Simply write the following line on your .htaccess file and you are good to go.

order allow,deny
allow from 123.4.5.12
deny from all

In this case Apache will block all IP addresses except your friends IP address. This is as simple as it can get and I hope you got the basic idea.

Note: On all of my example I used either “allow from all” or “deny from all” at the bottom, this is very important. You must declare either one of these line based on your requirement or things might get little more complicated.

Also remember that all blocked IP addresses would be forwarded or shown an “403 Forbidden” error message. You can definitely customize this message as well but that’s something I will talk about in another post.

Source: iftekhar.net

Categories: Logiciel Tags: , , ,

Detect and Block WordPress Brute Force Login Attacks

01/12/2015 Comments off

detect and block wordpress brute forceIf you run a wordpress blog these days, you are likely to experience brute force attacks where nefarious individuals attempt to break in to your website by quickly a list of userids and passwords against your wp-login.php.  Here’s how I automated detection and blocking of WordPress brute force login attacks.

Detecting a WordPress Brute Force Attack

One can typically detect a wordpress brute force attack by parsing through your webserver’s access_log file.  The access_log file records all of the access requests that a web server handles.  A brute force attack typically will have frequent and numerous attempts to the wp-login.php file as shown below:

Example:  In the access_log file below, we detect a brute force login attack on our WordPress blog.  We detected it by noticing frequent and constant requests to the wp-login.php file.

31.192.210.159 - - [11/Sep/2014:02:01:43 +0000] "POST http://www.uptimemadeeasy.com/wp-login.php HTTP/1.1" 200 3389 "http://www.uptimemadeeasy.com/wp-login.php" "Mozilla/5.0 (Linux; U; Android 2.2) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1"
31.192.210.159 - - [11/Sep/2014:02:01:44 +0000] "POST http://www.uptimemadeeasy.com/wp-login.php HTTP/1.1" 200 3389 "http://www.uptimemadeeasy.com/wp-login.php" "Mozilla/5.0 (Linux; U; Android 2.2) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1"
31.192.210.159 - - [11/Sep/2014:02:01:45 +0000] "POST http://www.uptimemadeeasy.com/wp-login.php HTTP/1.1" 200 3389 "http://www.uptimemadeeasy.com/wp-login.php" "Mozilla/5.0 (Linux; U; Android 2.2) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1"
31.192.210.159 - - [11/Sep/2014:02:01:47 +0000] "POST http://www.uptimemadeeasy.com/wp-login.php HTTP/1.1" 200 3389 "http://www.uptimemadeeasy.com/wp-login.php" "Mozilla/5.0 (Linux; U; Android 2.2) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1"
31.192.210.159 - - [11/Sep/2014:02:01:49 +0000] "POST http://www.uptimemadeeasy.com/wp-login.php HTTP/1.1" 200 3389 "http://www.uptimemadeeasy.com/wp-login.php" "Mozilla/5.0 (Linux; U; Android 2.2) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1"
31.192.210.159 - - [11/Sep/2014:02:01:50 +0000] "POST http://www.uptimemadeeasy.com/wp-login.php HTTP/1.1" 200 3389 "http://www.uptimemadeeasy.com/wp-login.php" "Mozilla/5.0 (Linux; U; Android 2.2) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1"
31.192.210.159 - - [11/Sep/2014:02:01:51 +0000] "POST http://www.uptimemadeeasy.com/wp-login.php HTTP/1.1" 200 3389 "http://www.uptimemadeeasy.com/wp-login.php" "Mozilla/5.0 (Linux; U; Android 2.2) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1"
31.192.210.159 - - [11/Sep/2014:02:01:52 +0000] "POST http://www.uptimemadeeasy.com/wp-login.php HTTP/1.1" 200 3389 "http://www.uptimemadeeasy.com/wp-login.php" "Mozilla/5.0 (Linux; U; Android 2.2) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1"
31.192.210.159 - - [11/Sep/2014:02:01:54 +0000] "POST http://www.uptimemadeeasy.com/wp-login.php HTTP/1.1" 200 3389 "http://www.uptimemadeeasy.com/wp-login.php" "Mozilla/5.0 (Linux; U; Android 2.2) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1"
31.192.210.159 - - [11/Sep/2014:02:01:55 +0000] "POST http://www.uptimemadeeasy.com/wp-login.php HTTP/1.1" 200 3389 "http://www.uptimemadeeasy.com/wp-login.php" "Mozilla/5.0 (Linux; U; Android 2.2) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1"

Typically in an event like this, I lookup the IP address in the ARIN database as I showed in a previous article:  What Personal Information Can You Get From Your Web Server?  Frequently, I find that the address is from APAC or RIPE addresses.

Lire la suite…

URL rewriting, Apache 2.4 et WordPress: pour ne pas y passer deux heures…

22/09/2015 Comments off

Le URL rewriting (permaliens) sous WordPress nécessite pour la version 2.4 de Apache des paramètres différents de ceux utilisés pour Apache 2.2.

La configuration des fichiers:

  • monsite.com.conf
  • .htaccess

de votre site Wordpress est spécifique lors du passage à Apache 2.4.

Si vous choisissez /%year%/%monthnum%/%postname%/, il faut préciser le chemin complet dans la configuration du site (monsite.com.conf):

En effet, il faut activer:

 <Directory /var/www/dbsysnet/>
 Require all granted
 Options -Indexes
 AllowOverride All
 </Directory>

en n’oubliant surtout pas Require all granted et surtout le « / » à la fin du chemin vers le dossier racine.

Sinon tous les permaliens amèneront à une page « Not found » et même pas celle que vous avez défini pour les erreurs 404 dans votre .htaccess.

Voilà. Ça m’a pris plus de deux heures (si Julien n’avait pas été là, on aurait retrouvé mon cadavre au bout d’une branche…).

 

Categories: Logiciel, Système Tags: , , ,

Protect WordPress sites with .htaccess

19/10/2014 Comments off

Plug-ins

Our job as WordPress users (aside from contributing to the WordPress community) is keeping our installs safe from people we do not want to access our sites. There are numerous plug-ins to help shore up our WordPress defenses such as Login LockDown which records IP address and blocks them after a set number of login attempts which helps against brute force attacks. Lire la suite…

Basic .htaccess for New Projects

12/10/2014 Comments off
# allows php on html
 AddType application/x-httpd-php .html
# Using this code, instead of having to type in http://mysite.com/contact.php, you only need to enter http://mysite.com/contact to access that page.
# And the best part is, you can still access the page with .php on the end of it, so no old incoming links or bookmarks become orphaned as a result of this, and everyone is happy.
 RewriteCond %{REQUEST_FILENAME} !-d
 RewriteCond %{REQUEST_FILENAME}\.htm -f
 RewriteRule ^(.*)$ $1.htm
# gzip compression.
# html, txt, css, js, json, xml, htc:
 AddOutputFilterByType DEFLATE text/html text/plain text/css application/json
 AddOutputFilterByType DEFLATE text/javascript application/javascript application/x-javascript
 AddOutputFilterByType DEFLATE text/xml application/xml text/x-component
# ------------------------
# CACHING to speed up site
# MONTH
 <FilesMatch "\.(flv|gif|jpg|jpeg|png|ico|swf)$">
 Header set Cache-Control "max-age=2592000"
# WEEK
 <FilesMatch "\.(js|css|pdf|txt)$">
 Header set Cache-Control "max-age=604800"
# DAY
 <FilesMatch "\.(html|htm)$">
 Header set Cache-Control "max-age=43200"
# webfonts and svg:
 <FilesMatch "\.(ttf|otf|eot|svg)$" >
 SetOutputFilter DEFLATE
# use utf-8 encoding for anything served text/plain or text/html
 AddDefaultCharset utf-8
# force utf-8 for a number of file formats
 AddCharset utf-8 .html .css .js .xml .json .rss
# Custom 400 errors
 ErrorDocument 400 /error.php
# Custom 401 errors
 ErrorDocument 401 /error.php
# Custom 403 errors
 ErrorDocument 403 /error.php
# Custom 404 errors
 ErrorDocument 404 /error.php
# Custom 500 errors
 ErrorDocument 500 /error.php
# Changes http://example.com to http://www.example.com
 RewriteEngine on
 RewriteCond %{HTTP_HOST} !^www.your-domain.com$
 RewriteRule ^(.*)$ http://www.your-domain.com/$1 [R=301]
# Specifies what file will be the directory index
 DirectoryIndex index.php index.html index.htm
# Unhide the code below to turn on a Site Down Page
 # RewriteEngine On
 # RewriteBase /
 # RewriteCond %{REQUEST_URI} !^/your-domain\.php$
 # RewriteRule ^(.*)$ http://your-domain.com/site-down.php [R=307,L]
# redirect any variations of a specific character string to a specific address
 # RewriteEngine On
 # RewriteRule ^appsupport http://www.your-domain.com/ [R]
# ---- # The following will redirect to the new page permanently ----#
 # Redirect 301 /index.php http://www.your-domain.com/site-down.php
Categories: Système Tags: ,