Php - Lockit Download

if ($_SESSION['user_tier'] < $requiredTierForFile[$id]) die("Upgrade to download this.");

Example exploit: download.php?file=../config.php php lockit download

Omar sat with Maya and explained: “You don’t just need a lock — you need the right lock for the right door.” He helped her build a secure download handler step by step

$realpath = realpath($filepath); if ($realpath === false || strpos($realpath, realpath(SECURE_STORAGE)) !== 0) die("Hacking attempt detected."); or map IDs to real filenames.

$allowedFiles = [ 101 => 'report_2024.pdf', 102 => 'guide_php_security.pdf' ]; $id = intval($_GET['id']); if (!isset($allowedFiles[$id])) die("Invalid request.");

header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename="' . $realFile . '"'); header('Content-Length: ' . filesize($filepath)); readfile($filepath); exit; The Happy Ending: Maya implemented all these steps. Her download system was now properly “lockit” — secured, logged, and unguessable. The suspicious activity stopped, and her users could safely download files without exposing the server to risk.

He helped her build a secure download handler step by step. Store files with random, unguessable names, or map IDs to real filenames.