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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | /** @license For full copyright and license information, please see the LICENSE.md file. */ |
| 6 | |
| 7 | namespace App\Core\Security\Path; |
| 8 | |
| 9 | defined('AMMONLY_APP') || exit('Direct script access is forbidden.'); |
| 10 | |
| 11 | /** |
| 12 | * Enterprise Safe Storage Path Resolver. |
| 13 | * |
| 14 | * Enforces strict directory sandboxing to eliminate Directory / Path Traversal (LFI) |
| 15 | * vulnerabilities during file read, write, and deletion operations. |
| 16 | * |
| 17 | * @package App\Core\Security\Path |
| 18 | */ |
| 19 | final readonly class SafeStoragePathResolver |
| 20 | { |
| 21 | /** |
| 22 | * Resolves an absolute path for reading an existing file within a sandboxed base directory. |
| 23 | * |
| 24 | * @param string $baseDir The allowed root directory (must exist). |
| 25 | * @param string $relativePath Relative file path to verify and resolve. |
| 26 | * @return string|null Absolute canonical path if safe and exists, null otherwise. |
| 27 | */ |
| 28 | public static function resolve(string $baseDir, string $relativePath): ?string |
| 29 | { |
| 30 | $realBase = realpath($baseDir); |
| 31 | if (str_contains($relativePath, "\0") || trim($relativePath) === '' || $realBase === false) { |
| 32 | return null; |
| 33 | } |
| 34 | |
| 35 | $normalizedRel = str_replace(['/', '\\'], DIRECTORY_SEPARATOR, $relativePath); |
| 36 | $fullPath = $realBase . DIRECTORY_SEPARATOR . ltrim($normalizedRel, DIRECTORY_SEPARATOR); |
| 37 | |
| 38 | $realTarget = realpath($fullPath); |
| 39 | if ($realTarget === false || !is_file($realTarget)) { |
| 40 | return null; |
| 41 | } |
| 42 | |
| 43 | return self::isPathInsideBase($realBase, $realTarget) ? $realTarget : null; |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * Resolves an absolute path for creating or deleting a file within a sandboxed base directory. |
| 48 | * |
| 49 | * @param string $baseDir The allowed root directory (must exist). |
| 50 | * @param string $relativePath Relative file path to verify. |
| 51 | * @return string|null Absolute canonical path if safe, null otherwise. |
| 52 | */ |
| 53 | public static function resolveWritable(string $baseDir, string $relativePath): ?string |
| 54 | { |
| 55 | $realBase = realpath($baseDir); |
| 56 | if (str_contains($relativePath, "\0") || trim($relativePath) === '' || $realBase === false) { |
| 57 | return null; |
| 58 | } |
| 59 | |
| 60 | $normalizedRel = str_replace(['/', '\\'], DIRECTORY_SEPARATOR, $relativePath); |
| 61 | $fullPath = $realBase . DIRECTORY_SEPARATOR . ltrim($normalizedRel, DIRECTORY_SEPARATOR); |
| 62 | |
| 63 | $realTargetDir = realpath(dirname($fullPath)); |
| 64 | if ($realTargetDir === false) { |
| 65 | return null; |
| 66 | } |
| 67 | |
| 68 | $candidatePath = $realTargetDir . DIRECTORY_SEPARATOR . basename($fullPath); |
| 69 | return self::isPathInsideBase($realBase, $candidatePath) ? $candidatePath : null; |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * Verifies that the candidate path resides strictly within the base directory. |
| 74 | * |
| 75 | * @param string $realBase Canonical base directory. |
| 76 | * @param string $candidatePath Canonical or normalized candidate path. |
| 77 | * @return bool True if inside base directory, false otherwise. |
| 78 | */ |
| 79 | private static function isPathInsideBase(string $realBase, string $candidatePath): bool |
| 80 | { |
| 81 | $baseWithSep = rtrim($realBase, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR; |
| 82 | return str_starts_with($candidatePath, $baseWithSep); |
| 83 | } |
| 84 | } |