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<?php |
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if (!defined('ABSPATH')) exit; |
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if (!class_exists('WPRWP2FATimeOTPLogin')) : |
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|
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class WPRWP2FATimeOTPLogin { |
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const SECRET_LENGTH = 32; |
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const MAX_ATTEMPTS = 5; |
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const ATTEMPT_WINDOW = 900; |
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const THROTTLED_MESSAGE = 'Too many incorrect codes. Please try again in %s.'; |
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|
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public static function authenticate($user) { |
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$code = WPRHelper::getRawParam('POST', 'twofa_code'); |
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if (!is_string($code) || $code === '') { |
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wp_send_json_success(array('twofa_enabled' => true)); |
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exit; |
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} |
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|
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$secret = self::loadSecret($user); |
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if ($secret === null) { |
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WPRWP2FA::sendFailure(WPRWP2FA::CONFIG_MESSAGE); |
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} |
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|
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$wait = self::secondsUntilNextAttempt($user->ID); |
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if ($wait > 0) { |
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WPRWP2FA::sendFailure(sprintf(self::THROTTLED_MESSAGE, WPRWP2FA::humanWait($wait))); |
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} |
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|
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# Counted before the code is checked. An attempt we cannot count must not |
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# happen, and concurrent attempts must not share one count. |
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if (!self::recordAttempt($user->ID)) { |
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WPRWP2FA::sendFailure(sprintf(self::THROTTLED_MESSAGE, WPRWP2FA::humanWait(self::ATTEMPT_WINDOW))); |
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} |
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|
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$slice = null; |
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if (ctype_digit($code)) { |
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$slice = WPRWP2FATimeOTP::matchingSlice($secret, $code); |
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} |
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|
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$state = self::loadState($user->ID); |
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|
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# RFC 6238: a code from a slice already accepted must not be accepted |
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# again. Without this the same code works for its whole 90 second window. |
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if ($slice === null || $slice <= $state['last_slice']) { |
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return new WP_Error('invalid_2fa_code', esc_html(self::invalidCodeMessage())); |
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} |
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|
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# Without the slice recorded the code stays replayable for the rest of its |
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# window, so a login that cannot be recorded is refused rather than left |
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# unaccounted for. |
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if (!self::recordSuccess($user->ID, $state, $slice)) { |
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WPRWP2FA::sendFailure(WPRWP2FA::CONFIG_MESSAGE); |
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} |
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|
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return $user; |
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} |
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|
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public static function clearState($user_id) { |
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delete_user_meta($user_id, WPRWP2FA::ATTEMPTS_META_KEY); |
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|
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return !metadata_exists('user', $user_id, WPRWP2FA::ATTEMPTS_META_KEY); |
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} |
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|
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private static function secondsUntilNextAttempt($user_id) { |
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$state = self::loadState($user_id); |
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$now = time(); |
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|
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if ($now - $state['window_at'] >= self::ATTEMPT_WINDOW) { |
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return 0; |
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} |
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|
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if ($state['failures'] < self::MAX_ATTEMPTS) { |
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return 0; |
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} |
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|
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return $state['window_at'] + self::ATTEMPT_WINDOW - $now; |
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} |
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|
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private static function recordAttempt($user_id) { |
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$now = time(); |
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$current = self::loadState($user_id); |
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|
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$window_at = $current['window_at']; |
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$failures = $current['failures']; |
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if ($now - $window_at >= self::ATTEMPT_WINDOW) { |
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$window_at = $now; |
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$failures = 0; |
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} |
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|
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$next = array( |
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'failures' => $failures + 1, |
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'window_at' => $window_at, |
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'last_slice' => $current['last_slice'] |
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); |
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|
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return update_user_meta($user_id, WPRWP2FA::ATTEMPTS_META_KEY, $next, $current) !== false; |
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} |
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|
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private static function recordSuccess($user_id, $current, $slice) { |
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$next = array('failures' => 0, 'window_at' => time(), 'last_slice' => $slice); |
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|
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return update_user_meta($user_id, WPRWP2FA::ATTEMPTS_META_KEY, $next, $current) !== false; |
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} |
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|
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private static function loadState($user_id) { |
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$blank = array('failures' => 0, 'window_at' => 0, 'last_slice' => 0); |
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$state = get_user_meta($user_id, WPRWP2FA::ATTEMPTS_META_KEY, true); |
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|
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if (!self::validState($state, $blank)) { |
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delete_user_meta($user_id, WPRWP2FA::ATTEMPTS_META_KEY); |
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return $blank; |
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} |
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|
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return $state; |
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} |
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|
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private static function validState($state, $blank) { |
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if (!is_array($state)) { |
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return false; |
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} |
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|
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foreach ($blank as $field => $default) { |
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if (!isset($state[$field]) || !is_int($state[$field]) || $state[$field] < 0) { |
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return false; |
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} |
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} |
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|
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return true; |
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} |
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|
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private static function loadSecret($user) { |
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$info = WPRWP2FAUtils::getSecretInfo(get_user_meta($user->ID, WPRWP2FA::SECRET_META_KEY, true)); |
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if (is_null($info['secret']) || is_null($info['is_encrypted'])) { |
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return null; |
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} |
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|
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$secret = $info['secret']; |
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if ($info['is_encrypted'] === true) { |
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# An encrypted secret with no key to open it is a misconfiguration, not a usable secret. |
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if (!defined('SECURE_AUTH_KEY')) { |
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return null; |
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} |
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|
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$decrypted = WPRHelper::opensslDecrypt($secret, WPRWP2FA::$cipher_algo, SECURE_AUTH_KEY); |
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if ($decrypted[0] === false) { |
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return null; |
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} |
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|
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$secret = $decrypted[1]; |
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} |
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|
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if (!is_string($secret) || strlen($secret) !== self::SECRET_LENGTH) { |
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return null; |
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} |
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|
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return $secret; |
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} |
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|
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private static function invalidCodeMessage() { |
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return WPRWP2FA::whitelabelMessage('2fa_error_message', WPRWP2FA::INVALID_CODE_MESSAGE); |
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} |
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} |
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endif; |
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|
