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<?php /** * Error Protection API: WP_Recovery_Mode_Cookie_Service class * * @package WordPress * @since 5.2.0 / /* * Core class used to set, validate, and clear cookies that identify a Recovery Mode session. * * @since 5.2.0 / #[AllowDynamicProperties] final class WP_Recovery_Mode_Cookie_Service { /* * Checks whether the recovery mode cookie is set. * * @since 5.2.0 * * @return bool True if the cookie is set, false otherwise. / public function is_cookie_set() { return ! empty( $_COOKIE[ RECOVERY_MODE_COOKIE ] ); } /* * Sets the recovery mode cookie. * * This must be immediately followed by exiting the request. * * @since 5.2.0 / public function set_cookie() { $value = $this->generate_cookie(); /* * Filters the length of time a Recovery Mode cookie is valid for. * * @since 5.2.0 * * @param int $length Length in seconds. / $length = apply_filters( 'recovery_mode_cookie_length', WEEK_IN_SECONDS ); $expire = time() + $length; setcookie( RECOVERY_MODE_COOKIE, $value, $expire, COOKIEPATH, COOKIE_DOMAIN, is_ssl(), true ); if ( COOKIEPATH !== SITECOOKIEPATH ) { setcookie( RECOVERY_MODE_COOKIE, $value, $expire, SITECOOKIEPATH, COOKIE_DOMAIN, is_ssl(), true ); } } /* * Clears the recovery mode cookie. * * @since 5.2.0 / public function clear_cookie() { setcookie( RECOVERY_MODE_COOKIE, ' ', time() - YEAR_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN ); setcookie( RECOVERY_MODE_COOKIE, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN ); } /* * Validates the recovery mode cookie. * * @since 5.2.0 * * @param string $cookie Optionally specify the cookie string. * If omitted, it will be retrieved from the super global. * @return true\|WP_Error True on success, error object on failure. / public function validate_cookie( $cookie = '' ) { if ( ! $cookie ) { if ( empty( $_COOKIE[ RECOVERY_MODE_COOKIE ] ) ) { return new WP_Error( 'no_cookie', __( 'No cookie present.' ) ); } $cookie = $_COOKIE[ RECOVERY_MODE_COOKIE ]; } $parts = $this->parse_cookie( $cookie ); if ( is_wp_error( $parts ) ) { return $parts; } list( , $created_at, $random, $signature ) = $parts; if ( ! ctype_digit( $created_at ) ) { return new WP_Error( 'invalid_created_at', __( 'Invalid cookie format.' ) ); } /* This filter is documented in wp-includes/class-wp-recovery-mode-cookie-service.php / $length = apply_filters( 'recovery_mode_cookie_length', WEEK_IN_SECONDS ); if ( time() > $created_at + $length ) { return new WP_Error( 'expired', __( 'Cookie expired.' ) ); } $to_sign = sprintf( 'recovery_mode\|%s\|%s', $created_at, $random ); $hashed = $this->recovery_mode_hash( $to_sign ); if ( ! hash_equals( $signature, $hashed ) ) { return new WP_Error( 'signature_mismatch', __( 'Invalid cookie.' ) ); } return true; } /* * Gets the session identifier from the cookie. * * The cookie should be validated before calling this API. * * @since 5.2.0 * * @param string $cookie Optionally specify the cookie string. * If omitted, it will be retrieved from the super global. * @return string\|WP_Error Session ID on success, or error object on failure. / public function get_session_id_from_cookie( $cookie = '' ) { if ( ! $cookie ) { if ( empty( $_COOKIE[ RECOVERY_MODE_COOKIE ] ) ) { return new WP_Error( 'no_cookie', __( 'No cookie present.' ) ); } $cookie = $_COOKIE[ RECOVERY_MODE_COOKIE ]; } $parts = $this->parse_cookie( $cookie ); if ( is_wp_error( $parts ) ) { return $parts; } list( , , $random ) = $parts; return sha1( $random ); } /* * Parses the cookie into its four parts. * * @since 5.2.0 * * @param string $cookie Cookie content. * @return array\|WP_Error Cookie parts array, or error object on failure. / private function parse_cookie( $cookie ) { $cookie = base64_decode( $cookie ); $parts = explode( '\|', $cookie ); if ( 4 !== count( $parts ) ) { return new WP_Error( 'invalid_format', __( 'Invalid cookie format.' ) ); } return $parts; } /* * Generates the recovery mode cookie value. * * The cookie is a base64 encoded string with the following format: * * recovery_mode\|iat\|rand\|signature * * Where "recovery_mode" is a constant string, * iat is the time the cookie was generated at, * rand is a randomly generated password that is also used as a session identifier * and signature is an hmac of the preceding 3 parts. * * @since 5.2.0 * * @return string Generated cookie content. / private function generate_cookie() { $to_sign = sprintf( 'recovery_mode\|%s\|%s', time(), wp_generate_password( 20, false ) ); $signed = $this->recovery_mode_hash( $to_sign ); return base64_encode( sprintf( '%s\|%s', $to_sign, $signed ) ); } /* * Gets a form of `wp_hash()` specific to Recovery Mode. * * We cannot use `wp_hash()` because it is defined in `pluggable.php` which is not loaded until after plugins are loaded, * which is too late to verify the recovery mode cookie. * * This tries to use the `AUTH` salts first, but if they aren't valid specific salts will be generated and stored. * * @since 5.2.0 * * @param string $data Data to hash. * @return string\|false The hashed $data, or false on failure. / private function recovery_mode_hash( $data ) { $default_keys = array_unique( array( 'put your unique phrase here', / * translators: This string should only be translated if wp-config-sample.php is localized. * You can check the localized release package or * https://i18n.svn.wordpress.org/<locale code>/branches/<wp version>/dist/wp-config-sample.php */ __( 'put your unique phrase here' ), ) ); if ( ! defined( 'AUTH_KEY' ) \|\| in_array( AUTH_KEY, $default_keys, true ) ) { $auth_key = get_site_option( 'recovery_mode_auth_key' ); if ( ! $auth_key ) { if ( ! function_exists( 'wp_generate_password' ) ) { require_once ABSPATH . WPINC . '/pluggable.php'; } $auth_key = wp_generate_password( 64, true, true ); update_site_option( 'recovery_mode_auth_key', $auth_key ); } } else { $auth_key = AUTH_KEY; } if ( ! defined( 'AUTH_SALT' ) \|\| in_array( AUTH_SALT, $default_keys, true ) \|\| AUTH_SALT === $auth_key ) { $auth_salt = get_site_option( 'recovery_mode_auth_salt' ); if ( ! $auth_salt ) { if ( ! function_exists( 'wp_generate_password' ) ) { require_once ABSPATH . WPINC . '/pluggable.php'; } $auth_salt = wp_generate_password( 64, true, true ); update_site_option( 'recovery_mode_auth_salt', $auth_salt ); } } else { $auth_salt = AUTH_SALT; } $secret = $auth_key . $auth_salt; return hash_hmac( 'sha1', $data, $secret ); } }