authentication-class

Database Layout:
CREATE TABLE `gebruikers` (
`gebruikerid` int(6) NOT NULL auto_increment,
`gebruikersnaam` varchar(50) NOT NULL,
`voornaam` varchar(40) NOT NULL,
`tussenvoegsel` varchar(25) NOT NULL,
`achternaam` varchar(40) NOT NULL,
`wachtwoord` varchar(40) NOT NULL,
`niveau` int(6) NOT NULL,

PRIMARY KEY (`gebruikerid`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=2 ;


Database Connect('config.php')

Code (php)

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<?php
session_start();

//Userlevels:

define('BANNED', 0);
define('QUEST', 1);
define('USER', 2);
define('VIP', 3);
define('REDACTEUR', 4);
define('MODERATOR', 5);
define('SUPERMODERATOR', 6);
define('ADMIN', 7);

include('clsAuthentication.php');
$db = new PDO('mysql:host=localhost;dbname=test', $user, $pass);
try
{
    $Auth = new Authentication($db);
}
catch(Exception $e)
{
    echo 'Message: ' .$e->getMessage();
}
?>

Code (php)

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<?php
include('config.php');
$Auth->setRequiredAuth(QUEST);
$Auth->login('Gebruikersnaam', 'Wachtwoord');
?>

Code (php)

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<?php
class Authentication
{
    static $db;
    private $m_sSaltkey;
    protected $m_aUserdata = array();
    
    function __construct($p_oDatabaseConnection)
    {
        if(is_object($p_oDatabaseConnection))
        {
            $this->db = $p_oDatabaseConnection;
        }
        else
        {
            throw new Exception('Geen database Connection ?');
            exit;
        }
        $this->getLoginStatus();
    }
    
    public function login($p_sUsername, $p_sPassword)
    {
        $p_sUsername = $this->db->quote($p_sUsername);
        $p_sPassword = $this->db->quote($p_sPassword);
        if(!isset($_SESSION['user_id']))
        {
            if($this->getUserdata($p_sUsername, $p_sPassword))
            {
                $_SESSION['login_time'] = time();
                $_SESSION['user_id'] = $this->m_aUserdata['gebruikerid'];
                $_SESSION['server_generated'] = true;
                $_SESSION['username'] = $this->m_aUserdata['gebruikersnaam'];
                $_SESSION['ip_adress'] = $_SERVER['REMOTE_ADDR'];
                $_SESSION['user_agent'] = $_SERVER['HTTP_USER_AGENT'];
                $_SESSION['auth_lvl'] = $this->aUserdata['niveau'];
            }
        }
        else
        {
            throw new Exception('Je bent al ingelogd');
        }
    }
    private function validateSession()
    {
        if(($_SERVER['REMOTE_ADDR'] != $_SESSION['ip_adress']) or ($_SERVER['HTTP_USER_AGENT'] != $_SESSION['user_agent']) or empty($_SESSION['server_generated']))
        {
            $this->logout();
            throw new Exception('Sessie informatie corrupt');
            return false;
        }
        return true;
    }
    
    private function getLoginStatus()
    {
        if(isset($_SESSION['user_id']))
        {
            if($this->validateSession())
            {
                return true;
            }
        }
        return false;
    }
    
    
    function setRequiredAuth($p_nRequired)
    {
        if($this->getLoginStatus())
        {
            if($_SESSION['auth_lvl'] < $p_nRequired)
            {
                echo 'Je hebt niet genoeg rechten om hier te mogen komen';
                exit;
            }
        }
        else
        {
            if($p_nRequired > 1)
            {
                echo 'Je moet ingelogd zijn en de benodigede rechten hebben om hier te mogen komen';
                exit;
            }
        }
        return true;
    }
    
    private function getSaltkey()
    {
        if(is_file("salt.key") and is_readable("salt.key"))
        {
            $filePointer =  fopen('salt.key', 'r');
            $this->m_sSaltkey = fread($filePointer, 40);
            fclose($filePointer);
        }
        else
        {
            $filePointer = fopen('salt.key', 'w+');
            $aRange = range('A', 'z');
            shuffle($aRange);
            $sSaltkey = sha1(implode('', $aRange));
            fwrite($filePointer, $sSaltkey);
            chmod('salt.key', 660);
            $this->getSaltkey(); //recall it self to load 'new'
        }
    }
    
    private function getUserdata($p_sUsername, $p_sPassword)
    {
        $aSql = $this->db->query("
            SELECT *
            FROM gebruikers
            WHERE LOWER(gebruikersnaam) = LOWER('".$p_sUsername."') AND wachtwoord = '".sha1(sha1($p_sPassword).$this->m_sSaltkey)."'
            LIMIT 1");
        if(!is_null($aSql))
        {
            $this->m_aUserdata = $aSql;
        }
        else
        {
            throw new Exception('Gebruikersnaam of Wachtwoord fout');
            return false;
        }
        return true;
    }    
    
    public function logout()
    {
        if(isset($_SESSION['user_id']))
        {
            session_destroy();
            return true;        
        }
        throw new Exception('Je kunt niet uitloggen als je niet bent ingelogd');
        return false;
    }
}
?>