Active Directory authentication

Step 1: Install the Extension
 
    Download the archive from the extension site.   http://www.mediawiki.org/wiki/Extension:LDAP_Authentication
    Extract the archive to the “extensions” folder in your MediaWiki installation.
    Add a RequireOnce line to the LocalSettings.php: require_once( "$IP/extensions/LdapAuthentication/LdapAuthentication.php" );
 
https://extdist.wmflabs.org/dist/LdapAuthentication-REL1_23-f266c74.tar.gz
The tar archive should be extracted into your extensions directory. For example, on a unix-like OS:
tar -xzf LdapAuthentication-REL1_23-f266c74.tar.gz -C /var/www/mediawiki/extensions