Fix redirect after login, prevent open redirects

index.php

@@ -117,6 +117,7 @@ elseif(OC_User::isLoggedIn()) {
 	if(!array_key_exists('sectoken', $_SESSION) || (array_key_exists('sectoken', $_SESSION) && is_null(OC::$REQUESTEDFILE)) || substr(OC::$REQUESTEDFILE, -3) == 'php'){
 		$sectoken=rand(1000000,9999999);
 		$_SESSION['sectoken']=$sectoken;
-		OC_Template::printGuestPage('', 'login', array('error' => $error, 'sectoken' => $sectoken, 'redirect' => substr($_SERVER['REQUEST_URI'], 1)));
+		$redirect_url = (isset($_REQUEST['redirect_url'])) ? $_REQUEST['redirect_url'] : $_SERVER['REQUEST_URI'];
+		OC_Template::printGuestPage('', 'login', array('error' => $error, 'sectoken' => $sectoken, 'redirect' => $redirect_url));
 	}
 }

lib/util.php

@@ -311,8 +311,8 @@ class OC_Util {
 	* Redirect to the user default page
 	*/
 	public static function redirectToDefaultPage(){
-		if(isset($_REQUEST['redirect_url'])) {
-			header( 'Location: /'.htmlentities($_REQUEST['redirect_url']));
+		if(isset($_REQUEST['redirect_url']) && substr($_REQUEST['redirect_url'], 0, strlen(OC::$WEBROOT)) == OC::$WEBROOT) {
+			header( 'Location: '.$_REQUEST['redirect_url']);
 		} else {
 			header( 'Location: '.OC::$WEBROOT.'/'.OC_Appconfig::getValue('core', 'defaultpage', '?app=files'));
 		}