Apachesecureauth.config.php

'ApacheSecureAuth' =>
  array (
'apacheEnv' => 'PHP_AUTH_USER',
    'ldapServer' => 'ldap://yourdomain',
    'ldapProtocol' => 3,
    'ldapReaderUser' => 'CN=ldapuseriwthreaderrights,OU=your_OU(s if several),DC=domain1,DC=domain2',
    'ldapReaderPassword' => 'reader password',
    'ldapDN' => 'DC=domainpart1,DC=domainpart2',
    'ldapSearchAttribut' => 'sAMAccountName',
    'ldapDefaultRoleId' => 1,
    'ldapDefaultOrg' => '1',
  ),