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<?php
/*******************************
* Auth.php
* Authentication Library
* handles the session and login mechanics of authentication.
* actual authentication is handled by various back-ends.
*
* Sessions must be enabled. Uses two session variables:
* username -- used to store the authenticated user name.
* sessionalive -- used to confirm that sessions are working.
*
* Example web app structure using Auth:
$users = new SqliteUserBackend();
$auth = new Auth($users,'authenticate');
include('header.php');
$username = $auth->login("Program Name");
$action = $_GET['action'];
If ($action == 'logout')
$auth->logout("Program Name");
elseif ($username != '')
handle_request();
include('footer.php');
******************************/
class Auth {
var $auth_object;
var $auth_function;
var $skip = array("PHPSESSID","login","password","firsttime","auth");
function Auth(&$object,$function) {
$this->auth_object = $object;
$this->auth_function = $function;
}
/*
* this function is used to prevent session-fixation attacks.
* it must be called BEFORE session_start.
* Basically, if this is a login request then we change the
* session id to be something new. This is because the session
* id might be an id which someone else has 'fixed' on the client's
* machine and we want to generate a new one which they don't know about.
*/
function init() {
if(isset($_REQUEST['login']) && isset($_REQUEST['password'])) {
$random_token = md5(uniqid(rand(),1));
session_id($random_token);
}
elseif(isset($_SERVER['REMOTE_USER']) && $this->type == 'external') {
$random_token = md5(uniqid(rand(),1));
session_id($random_token);
}
}
function logout() {
$_SESSION['username'] = NULL;
}
function getLoginForm($title='',$error='') {
$action = preg_replace('/\?.*$/', '', $_SERVER['REQUEST_URI']);
$action = htmlspecialchars($action);
$logintext = _("Login");
$ret = "
<center>
<FORM ACTION='$action' METHOD='POST'>
<table cellpadding='8'>
<tr><td colspan='2'><b>$title</b></td></tr>
<tr>
<td align='right'>user: </td>
<td><INPUT TYPE='text' NAME='login' value=''></td>
</tr>
<tr>
<td align='right'>password: </td>
<td><INPUT TYPE='password' NAME='password' value=''></td>
</tr>
<tr>
<td colspan='2'>
<font color='red'>$error</font>
</td>
</tr>
<tr>
<td colspan='2' align='right'>
<input type='hidden' name='firsttime' value='false'>
<input type='hidden' name='auth' value='login'>
<input type='submit' value='$logintext'>
";
foreach($_REQUEST as $arg => $value) {
if (in_array($arg,$this->skip)) continue;
if ($arg == 'data') {
$value = &getraw('data');
}
$arg = htmlspecialchars($arg);
$value = htmlentities($value);
$ret .= "<input type='hidden' name='$arg' value=\"";
$ret .= $value;
$ret .= "\"> \n";
}
$ret .= '</td>
</tr>
</table>
</FORM>
</center>';
return $ret;
}
function username() {
return $_SESSION['username'];
}
function login(&$error) {
$login = get('login');
$password = get('password');
$firsttime = get('firsttime',true);
if ($firsttime) {
$_SESSION['sessionalive'] = true;
}
elseif (!$_SESSION['session_alive']) {
$error = "Cookies are not enabled. You must enable cookies to login.";
return false;
}
$ok = $this->authenticate($login, $password, $error);
if (!$ok) {
if ($error == '')
$error = 'User or password was incorrect';
return false;
}
else {
$_SESSION['username'] = $login;
return true;
}
}
function authenticate($user,$pass,&$error) {
if (!method_exists($this->auth_object,$this->auth_function))
die(_("No authentication type set"));
$object = & $this->auth_object;
$function = $this->auth_function;
return $object->$function($user,$pass,$error);
}
/*
function getredirect() {
$action = preg_replace('/\?.*$/', '', $_SERVER['REQUEST_URI']);
$action .= "?";
foreach($_REQUEST as $arg => $value) {
if (in_array($arg,$this->skip)) continue;
$action .= "$arg=$value&";
}
return preg_replace("'[\?\&]$'","",$action);
}
*/
} // end class Auth
return;
?>
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