===== LDAP attributes =====
==== Must ====
  * uid
  * sn (lastname)
  * cn (common name)
  * st (STATUS)
  * userPassword
  * uidNumber
  * gidNumber
  * homeDirectory

==== May ====
  * givenname (firstname)
  * preferredLangauge
  * authorizedService
  * loginShell (Not used yet)
  * FTPDownloadRatio
  * FTPUploadRatio
  * FTPStatus
  * FTPUid
  * FTPGid
  * FTPQuotaMBtyes
  * description
  * mail