Archive

Articles taggués ‘php’

How to turn off server signature on Apache2 web server

14/11/2023 Comments off

Question: Whenever Apache2 web server returns error pages (e.g., 404 not found, 403 access forbidden pages), it shows web server signature (e.g., Apache version number and operating system info) at the bottom of the pages. Also, when Apache2 web server serves any PHP pages, it reveals PHP version info. How can I turn off these web server signatures in Apache2 web server?

Revealing web server signature with server/PHP version info can be a security risk as you are essentially telling attackers known vulnerabilities of your system. Thus it is recommended you disable all web server signatures as part of server hardening process.

14902970545_c3d406322f_o14879982016_7c7b8bbf3d_o

Disable Apache Web Server Signature

Disabling Apache web server signature can be achieved by editing Apache config file.

On Debian, Ubuntu or Linux Mint:

$ sudo vi /etc/apache2/apache2.conf

On CentOS, Fedora, RHEL or Arch Linux:

$ sudo vi /etc/httpd/conf/httpd.conf

Add the following two lines at the end of Apache config file.

ServerSignature Off
ServerTokens Prod

Then restart web server to activate the change:

$ sudo service apache2 restart (Debian, Ubuntu or Linux Mint)
$ sudo service httpd restart (CentOS/RHEL 6)
$ sudo systemctl restart httpd.service (Fedora, CentOS/RHEL 7, Arch Linux)

The first line ‘ServerSignature Off‘ makes Apache2 web server hide Apache version info on any error pages.

14879982016_7c7b8bbf3d_o

However, without the second line ‘ServerTokens Prod‘, Apache server will still include a detailed server token in HTTP response headers, which reveals Apache version number.

14902970535_e84ec23090_z

What the second line ‘ServerTokens Prod‘ does is to suppress a server token in HTTP response headers to a bare minimal.

So with both lines in place, Apache will not reveal Apache version info in either web pages or HTTP response headers.

14902970505_d79225f25d_z

Hide PHP Version

Another potential security threat is PHP version info leak in HTTP response headers. By default, Apache web server includes PHP version info via “X-Powered-By” field in HTTP response headers. If you want to hide PHP version in HTTP headers, open php.ini file with a text editor, look for “expose_php = On”, and change it to “expose_php = Off”.

14899917981_aaef71eb0a

On Debian, Ubuntu, or Linux Mint:

$ sudo vi /etc/php5/apache2/php.ini

On CentOS, Fedora, RHEL or Arch Linux:

$ sudo vi /etc/php.ini

expose_php = Off

Finally, restart Apache2 web server to reload updated PHP config file.

Now you will no longer see “X-Powered-By” field in HTTP response headers.

Source: Xmodulo

Categories: Logiciel, Sécurité Tags: , ,

Increase the phpMyAdmin Session Timeout

11/11/2023 Comments off

When phpMyAdmin is installed, the default session timeout value is too low for many users, making your phpMyAdmin session expire too soon. One could argue that a low session timeout value is a good idea from a security perspective. If you do not think this is an issue, here are a few simple steps that’ll let you change how long phpMyAdmin will keep your session(s) alive.

Open config.inc.php in the phpMyAdmin “root” directory. Look for a line that contains this: $cfg[‘LoginCookieValidity’]. Set the value to the desired number of seconds you want the session to stay alive (3600 = one hour, which is reasonable for most users). If you do not have that line in your config.inc.php file, add it like this:

$cfg[‘LoginCookieValidity’] = 3600;

Don’t forget to save the file, and then login again to phpMyAdmin. You may need to close the browser and re-open your phpMyAdmin URL.

This also assumes that the PHP session garbage collection is set-up accordingly. This can be done in a number of ways:

  • php.ini; add a line (or change an existing) that contains session.gc_maxlifetime = <seconds>
  • Apache configuration; add a line to the appropriate <Directory> block that says “php_admin_value session.gc_maxlifetime <seconds>”
  • config.inc.php (phpMyAdmin); after the previously edited line, add a line with “ini_set(‘session.gc_maxlifetime’, <seconds>);”

The <seconds> above is the same value that you set your variable to in config.inc.php at the beginning of this post, “3600” (sans quotes) in my case. (Some of these methods may or may not work on the server you’re using.)

This isn’t the only way to circumvent phpMyAdmin sessions expiring on you in the middle of that important work; you can, of course, configure phpMyAdmin to have appropriate access directly, thus allowing you to access your MySQL database(s) without entering a username and a password. You’ll find more information about this on the phpMyAdminwebsite.

Categories: Bases de données Tags: ,

Configuration d’un serveur dédié de A à Z

20/07/2023 Comments off

Installation, configuration et administration d’un serveur dédié

debianCes tutoriaux ont été réalisés sous Debian (versions Etch 4.0 et Lenny 5.0) mais peuvent être transposés à d’autres distributions Linux, notamment Ubuntu. Ils sont applicables aux serveurs dédiés 1&1, Dedibox, OVH, Amen, et bien d’autres.

warning Tous les tutoriaux sont basés sur un serveur nommé test.alsacreations.com pour lequel nous disposons d’un utilisateur dew et d’un accès root (super-administrateur), chacun avec leur propre mot de passe.

Nous partons de l’idée d’obtenir un serveur web avec tout ce qu’il faut pour héberger plusieurs domaines et sites. Vous pouvez tout configurer à la main ou bien faire confiance à un panel d’administration.

Liste complète sans panel web

idee Ces tutoriaux conviennent à l’installation complète d’un serveur

  1. Première connexion : SSH, accès root et bases
  2. Apache et PHP : le serveur web
  3. MySQL : les bases de données
  4. Proftpd : le serveur FTP
  5. Postfix : le serveur mail POP3 et SMTP
  6. Sauvegarde automatique : avec backup-manager et export FTP
  7. Sécurisation : les règles de base, un firewall avec iptables, fail2ban…
  8. Bind : exécuter le serveur DNS en chroot
  9. Monitoring : garder un oeil sur son serveur grâce à monit et logwatch
  10. Roundcube : un webmail léger et rapide

Liste complète avec panel d’administration DTC

dtclogo

idee Si vous choisissez d’installer le panel d’administration DTC, suivez ces tutoriels. DTC se chargera de la configuration du reste des services.

  1. Première connexion : SSH, accès root et bases
  2. Bind : exécuter le serveur DNS en chroot
  3. Sécurisation : les règles de base, un firewall avec iptables, fail2ban…
  4. Panel DTC : pour installer et gérer les services web, ftp, mysql, e-mail, dns…
  5. Monitoring : garder un oeil sur son serveur grâce à monit et logwatch
  6. Sauvegarde automatique : backup-manager et export FTP
  7. Roundcube : un webmail léger et rapide

Attention : nous préconisons désormais l’utilisation du panel ISPConfig, en lieu et place du panel DTC. Il est tout aussi simple à installer et à utiliser. Veuillez vous référer à sa documentation.

Mcrypt : Installation

03/07/2023 Comments off

Vous devez compiler PHP avec l’option –with-mcrypt=[DIR] pour activer cette extension. DIR est le dossier d’installation de mcrypt. Assurez-vous de compiler libmcrypt avec l’option –disable-posix-threads .

Note, for Ubuntu, simply installing php5-mcrypt did not get mcrypt to work. You need to execute the following commands as root to enable it:

apt-get install php5-mcrypt
 mv -i /etc/php5/conf.d/mcrypt.ini /etc/php5/mods-available/
 php5enmod mcrypt
 service apache2 restart

If you don’t have a /etc/php5/conf.d directory, you can simply only do: php5enmod mcrypt

Should be working fine.

Categories: Système Tags: ,

PHP MySQL Benchmark Tool (PMBT v. 0.2)

23/06/2023 Comments off

Source: Reasons Unbeknownst

The old saying “Need is the father of innovation” (or something like that) held true this weekend. I was looking for an easy way to benchmark MySQL for some RAM drive InnoDB experimentation but couldn’t find anything cross platform, user friendly, and created after 2005. So I built an early version of what I was looking for.

This is a very synthetic benchmark for now. In some instances InnoDB is much faster than MyISAM (simultaneous reads/writes) but that doesn’t come across in these results. I’m planning on beefing up the benchmark options in later versions. This tool is currently useful in benchmarking hard drive / RAID performance when using InnoDB. It’s also good for basic my.cnf tweaking. Lire la suite…