/**
* Validate Ldap User with given Credientials with netid and password
* @param array $credentials
* @return bool
*/
protected function validateLdapCredentials(array $credentials)
{
$ldap = new NuLdap();
$netid = $credentials[$this->netidKey];
$password = $credentials['password'];
return $ldap->validate($netid, $password);
}