#apt-get install php5-ldap

 $conf['authtype']                         = 'ldap';
$conf['auth']['ldap']['server']           = '10.1.10.3'; //ip-server
$conf['auth']['ldap']['binddn']           = '%{user}@donkha.com'; //domain
$conf['auth']['ldap']['usertree']         = 'dc=donkha,dc=com';
$conf['auth']['ldap']['userfilter']       = '(userPrincipalName=%{user}@donkha.com)'; // User@Domain
$conf['auth']['ldap']['mapping']['name']  = 'displayname';
$conf['auth']['ldap']['mapping']['grps']  = array('memberof' => '/CN=(.+?),/i');
$conf['auth']['ldap']['grouptree']        = 'dc=donkha,dc=com'; # position for find groups, at root here
$conf['auth']['ldap']['groupfilter']      = '(&(cn=*)(Member=%{dn})(objectClass=User))'; //Group User # find groups for current user(dn)
$conf['auth']['ldap']['referrals']        = 0; # Switch referrals off for use with Active Directory
$conf['auth']['ldap']['version']          = 3;
$conf['auth']['ldap']['debug']            = 0; #set 1 for watch authenticate activity (eg. list of user groups) on html page