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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Class for Two-Factor Authentication (2FA). |
| 5 | * |
| 6 | * This class handles all operations around creating, saving and getting the secret |
| 7 | * for a CurrentUser for two-factor-authentication. It also validates given tokens in |
| 8 | * comparison to a given secret and returns a QR-code for transmitting a secret to |
| 9 | * the authenticator-app. |
| 10 | * |
| 11 | * This Source Code Form is subject to the terms of the Mozilla Public License, |
| 12 | * v. 2.0. If a copy of the MPL was not distributed with this file, You can |
| 13 | * obtain one at http://mozilla.org/MPL/2.0/. |
| 14 | * |
| 15 | * @package phpMyFAQ |
| 16 | * @author Jan Harms <model_railroader@gmx-topmail.de> |
| 17 | * @copyright 2023-2026 phpMyFAQ Team |
| 18 | * @license http://www.mozilla.org/MPL/2.0/ Mozilla Public License Version 2.0 |
| 19 | * @link https://www.phpmyfaq.de |
| 20 | * @since 2023-03-11 |
| 21 | */ |
| 22 | |
| 23 | declare(strict_types=1); |
| 24 | |
| 25 | namespace phpMyFAQ\User; |
| 26 | |
| 27 | use phpMyFAQ\Configuration; |
| 28 | use RobThree\Auth\Algorithm; |
| 29 | use RobThree\Auth\Providers\Qr\EndroidQrCodeProvider; |
| 30 | use RobThree\Auth\TwoFactorAuth; |
| 31 | use RobThree\Auth\TwoFactorAuthException; |
| 32 | |
| 33 | class TwoFactor |
| 34 | { |
| 35 | private TwoFactorAuth $twoFactorAuth; |
| 36 | |
| 37 | private EndroidQrCodeProvider $endroidQrCodeProvider; |
| 38 | |
| 39 | /** |
| 40 | * Number of adjacent time slices accepted besides the current one. |
| 41 | * |
| 42 | * RobThree defaults to 1, which keeps a code usable for roughly 90 seconds and |
| 43 | * leaves a captured code replayable for that whole span. Accepting only the |
| 44 | * current slice shortens that to at most 30 seconds. The trade-off is that |
| 45 | * authenticator apps whose clock has drifted by more than one period are no |
| 46 | * longer tolerated. |
| 47 | */ |
| 48 | private const int VERIFY_DISCREPANCY = 0; |
| 49 | |
| 50 | /** |
| 51 | * @throws TwoFactorAuthException |
| 52 | */ |
| 53 | public function __construct( |
| 54 | private readonly Configuration $configuration, |
| 55 | private readonly CurrentUser $currentUser, |
| 56 | ) { |
| 57 | $this->endroidQrCodeProvider = new EndroidQrCodeProvider(); |
| 58 | $this->twoFactorAuth = new TwoFactorAuth( |
| 59 | $this->endroidQrCodeProvider, |
| 60 | (string) $this->configuration->get(item: 'main.titleFAQ'), |
| 61 | 6, |
| 62 | 30, |
| 63 | Algorithm::Sha1, |
| 64 | ); |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * Generates and returns a new secret without saving |
| 69 | */ |
| 70 | public function generateSecret(): string |
| 71 | { |
| 72 | return $this->twoFactorAuth->createSecret(); |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Saves a given secret to the current user from the session. |
| 77 | */ |
| 78 | public function saveSecret(#[\SensitiveParameter] string $secret): bool |
| 79 | { |
| 80 | if ($secret === '') { |
| 81 | return false; |
| 82 | } |
| 83 | |
| 84 | return $this->currentUser->setUserData(['secret' => $secret]); |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * Returns the secret of the current user |
| 89 | */ |
| 90 | public function getSecret(CurrentUser $currentUser): ?string |
| 91 | { |
| 92 | $secret = $currentUser->getUserData('secret'); |
| 93 | |
| 94 | return is_string($secret) ? $secret : null; |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * Validates a given token. Returns true if the token is correct. |
| 99 | */ |
| 100 | public function validateToken(#[\SensitiveParameter] string $token, int $userId): bool |
| 101 | { |
| 102 | if (strlen($token) !== 6 || $userId <= 0) { |
| 103 | return false; |
| 104 | } |
| 105 | |
| 106 | $this->currentUser->getUserById($userId); |
| 107 | |
| 108 | $secret = $this->currentUser->getUserData('secret'); |
| 109 | if (!is_string($secret) || $secret === '') { |
| 110 | return false; |
| 111 | } |
| 112 | |
| 113 | return $this->twoFactorAuth->verifyCode($secret, $token, self::VERIFY_DISCREPANCY); |
| 114 | } |
| 115 | |
| 116 | /** |
| 117 | * Returns a QR-Code to a given secret for transmitting the secret to the Authenticator-App |
| 118 | */ |
| 119 | public function getQrCode(#[\SensitiveParameter] string $secret): string |
| 120 | { |
| 121 | $label = $this->configuration->getTitle() . ':' . (string) $this->currentUser->getUserData('email'); |
| 122 | $qrCodeText = sprintf( |
| 123 | '%s&image=%sassets/templates/images/logo.png', |
| 124 | $this->twoFactorAuth->getQrText($label, $secret), |
| 125 | $this->configuration->getDefaultUrl(), |
| 126 | ); |
| 127 | |
| 128 | return sprintf( |
| 129 | 'data:%s;base64,%s', |
| 130 | $this->endroidQrCodeProvider->getMimeType(), |
| 131 | base64_encode($this->endroidQrCodeProvider->getQRCodeImage($qrCodeText, 200)), |
| 132 | ); |
| 133 | } |
| 134 | } |