321 lines
14 KiB
PHP
321 lines
14 KiB
PHP
<?php
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/**
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* PasswordManager
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*
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* Handles all password-related operations using zxcvbn-php for strength enforcement.
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* Designed to be reused across multiple flows:
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* - Profile page: authenticated user changes their own password (requires current password).
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* - Login forced reset: system-initiated change, no current password needed.
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* - Future: admin reset, forgot password (delegate to PasswordResetManager for OTP).
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*
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* Method order:
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* Core public API → checkStrength, change, forceSet
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* HTTP handler → handleChange (thin wrapper for AJAX endpoint)
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* Private helpers → loadZxcvbn, fetchUser, enforceStrength, persist
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*
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* Usage:
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* $pm = new PasswordManager($pdo, $include_url);
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*
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* // Live strength check (AJAX feedback while typing):
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* $result = $pm->checkStrength('mypassword', ['john', 'john@example.com']);
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*
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* // Authenticated user changing their own password:
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* $pm->change($user_id, $current_password, $new_password, $confirm_password);
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*
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* // Forced set (admin reset / login forced reset — skips current password check):
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* $pm->forceSet($user_id, $new_password, $confirm_password);
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*
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* Security:
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* - Passwords are hashed with PASSWORD_BCRYPT (cost factor PHP default = 10).
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* - zxcvbn score ≥ 3 ("safely unguessable") is required before any hash is written.
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* - User's own name, username, and email are passed to zxcvbn as penalty inputs.
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* - All DB queries use PDO prepared statements with bound parameters.
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* - AJAX handler methods output JSON via json_encode (XSS-safe for string values).
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*/
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class PasswordManager {
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private $pdo;
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private $zxcvbn_path;
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/** Minimum zxcvbn score required (0–4). 3 = "safely unguessable". */
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const MIN_SCORE = 3;
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/**
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* @param PDO $pdo PDO connection to the wms.user table database.
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* @param string $include_url Absolute server path to the app root directory,
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* used to locate the zxcvbn-php autoloader.
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* Example: '/var/www/html/wms'
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*/
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public function __construct($pdo, string $include_url) {
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$this->pdo = $pdo;
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$this->zxcvbn_path = rtrim($include_url, '/') . '/../lib/zxcvbn-php-master/vendor/autoload.php';
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}
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// ─────────────────────────────────────────────────────────────
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// Core public API
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// ─────────────────────────────────────────────────────────────
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/**
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* Run a zxcvbn password strength analysis and return structured feedback.
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*
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* Used by the live AJAX strength indicator while the user types.
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* Pass user-specific strings as $user_inputs so zxcvbn penalises
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* passwords that contain the user's own name, email, or username.
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*
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* Score meanings:
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* 0 — too guessable (online attack in < 100 guesses)
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* 1 — very guessable (online attack in < 1000 guesses)
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* 2 — somewhat guessable (offline attack in < 1M guesses)
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* 3 — safely unguessable (offline attack in < 100M guesses) ← MIN_SCORE
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* 4 — very unguessable (offline attack in > 100M guesses)
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*
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* @param string $password The password string to analyse.
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* @param array $user_inputs Strings to penalise if found in the password
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* (e.g. name, email, username).
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* @return array Keys: score (int 0–4), warning (string), suggestions (array of strings).
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*/
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public function checkStrength(string $password, array $user_inputs = []): array {
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$this->loadZxcvbn();
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$zxcvbn = new \ZxcvbnPhp\Zxcvbn();
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$result = $zxcvbn->passwordStrength($password, $user_inputs);
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return [
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'score' => (int) $result['score'],
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'warning' => $result['feedback']['warning'] ?? '',
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'suggestions' => $result['feedback']['suggestions'] ?? [],
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];
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}
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/**
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* Change the password for an authenticated user.
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*
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* Verifies the current password before applying the new one.
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* Use this on the profile settings page where the user is already logged in
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* and must prove knowledge of their existing password.
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*
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* Steps:
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* 1. Validates all fields are present and new passwords match.
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* 2. Fetches the user record and verifies $current_password via password_verify().
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* 3. Runs zxcvbn strength enforcement (throws if score < MIN_SCORE).
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* 4. Hashes and persists the new password.
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*
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* @param int $user_id The wms.user.user_id of the user changing their password.
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* @param string $current_password The user's current password for verification.
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* @param string $new_password The desired new password.
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* @param string $confirm_password Must match $new_password exactly.
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* @throws \InvalidArgumentException On validation failure (message is safe to show the user).
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* @throws \RuntimeException On DB failure (log internally, show generic message).
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*/
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public function change(int $user_id, string $current_password, string $new_password, string $confirm_password): void {
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if (empty($current_password) || empty($new_password) || empty($confirm_password)) {
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throw new \InvalidArgumentException('All password fields are required.');
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}
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if ($new_password !== $confirm_password) {
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throw new \InvalidArgumentException('New passwords do not match.');
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}
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$user = $this->fetchUser($user_id);
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if (!password_verify($current_password, $user['password'])) {
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throw new \InvalidArgumentException('Current password is incorrect.');
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}
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$this->enforceStrength($new_password, $user);
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$this->persist($user_id, $new_password);
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}
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/**
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* Force-set a new password without verifying the current one.
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*
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* Use for flows where the current password is unavailable or irrelevant:
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* - Admin-initiated password reset
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* - First-login forced password change
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* - Forgot-password flow after OTP verification (via PasswordResetManager)
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*
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* Steps:
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* 1. Validates new password fields are present and match.
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* 2. Fetches the user record (needed for zxcvbn personalisation).
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* 3. Runs zxcvbn strength enforcement.
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* 4. Hashes and persists the new password.
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*
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* @param int $user_id The wms.user.user_id to reset.
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* @param string $new_password The desired new password.
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* @param string $confirm_password Must match $new_password exactly.
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* @throws \InvalidArgumentException On validation failure.
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* @throws \RuntimeException On DB failure.
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*/
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public function forceSet(int $user_id, string $new_password, string $confirm_password): void {
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if (empty($new_password) || empty($confirm_password)) {
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throw new \InvalidArgumentException('Password fields are required.');
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}
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if ($new_password !== $confirm_password) {
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throw new \InvalidArgumentException('Passwords do not match.');
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}
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$user = $this->fetchUser($user_id);
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$this->enforceStrength($new_password, $user);
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$this->persist($user_id, $new_password);
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}
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// ─────────────────────────────────────────────────────────────
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// HTTP handler (thin AJAX endpoint wrapper)
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// ─────────────────────────────────────────────────────────────
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/**
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* Handle an AJAX change-password request and echo a JSON response.
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*
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* Called by: setting/api/engine/change_password.php
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*
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* Expected $data keys:
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* current_password, new_password, confirm_password (all strings)
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*
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* On success: destroys the session (forces re-login with new password),
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* returns { success: 1, message: "..." }
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* On InvalidArgumentException (validation): HTTP 400, { success: 0, message: "..." }
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* On other Exception (system error): HTTP 500, generic message (error logged server-side)
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*
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* Outputs JSON and calls exit. Safe against XSS — all output via json_encode.
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*
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* @param int $user_id The wms.user.user_id of the currently authenticated user.
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* @param array $data Request data array containing the password fields.
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*/
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public function handleChange(int $user_id, array $data): void {
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try {
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$this->change(
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$user_id,
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$data['current_password'] ?? '',
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$data['new_password'] ?? '',
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$data['confirm_password'] ?? ''
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);
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// Destroy session: user must re-authenticate with new password.
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// The db_auth OTP would invalidate naturally on next request
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// (hash changed), but explicit destroy is immediate.
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session_destroy();
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echo json_encode(['success' => 1, 'message' => 'Password changed successfully.']);
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} catch (\InvalidArgumentException $e) {
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http_response_code(400);
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echo json_encode(['success' => 0, 'message' => $e->getMessage()]);
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} catch (\Exception $e) {
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error_log('[PasswordManager::handleChange] ' . $e->getMessage());
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http_response_code(500);
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echo json_encode(['success' => 0, 'message' => 'Failed to change password. Please try again.']);
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}
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exit;
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}
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// ─────────────────────────────────────────────────────────────
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// Private helpers
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// ─────────────────────────────────────────────────────────────
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/**
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* Load the zxcvbn-php autoloader.
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*
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* Called lazily (only when a strength check is actually needed).
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* Throws a RuntimeException if the autoloader file is missing,
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* so misconfiguration is caught clearly rather than as a silent failure.
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*
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* @throws \RuntimeException If the autoloader file is not found.
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*/
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private function loadZxcvbn(): void {
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if (!file_exists($this->zxcvbn_path)) {
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throw new \RuntimeException('zxcvbn autoloader not found at: ' . $this->zxcvbn_path);
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}
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require_once $this->zxcvbn_path;
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}
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/**
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* Fetch a user record by user_id from the wms.user table.
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*
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* Returns the full user row including the hashed password (needed for
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* password_verify) and personal fields (needed for zxcvbn penalisation).
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*
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* @param int $user_id The wms.user.user_id to fetch.
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* @return array Associative user row: user_id, username, name, surname, email, password.
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* @throws \RuntimeException If no user is found for the given ID.
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*/
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private function fetchUser(int $user_id): array {
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$sth = $this->pdo->prepare(
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'SELECT user_id, username, name, surname, email, password
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FROM user WHERE user_id = :id LIMIT 1'
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);
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$sth->execute([':id' => $user_id]);
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$user = $sth->fetch(\PDO::FETCH_ASSOC);
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if (!$user) {
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throw new \RuntimeException('User not found.');
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}
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return $user;
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}
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/**
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* Run zxcvbn strength check and throw if the score is below MIN_SCORE.
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*
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* Passes user personal fields (name, surname, username, email) to zxcvbn
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* so that passwords containing the user's own details are penalised.
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* The first actionable feedback string from zxcvbn is included in the
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* exception message shown to the user.
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*
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* @param string $password The new password to evaluate.
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* @param array $user User row from fetchUser() — provides personalisation data.
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* @throws \InvalidArgumentException If score < MIN_SCORE, with zxcvbn feedback.
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*/
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private function enforceStrength(string $password, array $user): void {
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$user_inputs = array_values(array_filter([
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$user['username'] ?? '',
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$user['name'] ?? '',
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$user['surname'] ?? '',
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$user['email'] ?? '',
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]));
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$result = $this->checkStrength($password, $user_inputs);
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if ($result['score'] < self::MIN_SCORE) {
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$msg = $result['warning'] ?: ($result['suggestions'][0] ?? 'Please choose a stronger password.');
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throw new \InvalidArgumentException('Password is too weak. ' . $msg);
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}
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}
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/**
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* Hash the password with bcrypt and write it to the wms.user table.
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*
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* Uses PASSWORD_BCRYPT with PHP's default cost factor.
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* After this write, the OTP-based auth in db_auth.php will invalidate
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* on the next request because it re-derives the OTP from the stored hash —
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* changing the hash implicitly forces a fresh login.
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*
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* @param int $user_id The wms.user.user_id to update.
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* @param string $password The plain-text new password (will be hashed here).
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* @throws \RuntimeException If the UPDATE affected 0 rows (user not found or no change).
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*/
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private function persist(int $user_id, string $password): void {
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$hashed = password_hash($password, PASSWORD_BCRYPT);
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$sth = $this->pdo->prepare(
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'UPDATE user SET password = :password WHERE user_id = :user_id'
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);
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$sth->execute([
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':password' => $hashed,
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':user_id' => $user_id,
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]);
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if ($sth->rowCount() === 0) {
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throw new \RuntimeException('Password update failed — no rows affected.');
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}
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}
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} |