WordPress/wp-includes/class-wp-recovery-mode-cookie-service.php

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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
*/
Code Modernization: Add `AllowDynamicProperties` attribute to all (parent) classes. Dynamic (non-explicitly declared) properties are deprecated as of PHP 8.2 and are expected to become a fatal error in PHP 9.0. There are a number of ways to mitigate this: * If it is an accidental typo for a declared property: fix the typo. * For known properties: declare them on the class. * For unknown properties: add the magic `__get()`, `__set()`, et al. methods to the class or let the class extend `stdClass` which has highly optimized versions of these magic methods built in. * For unknown ''use'' of dynamic properties, the `#[AllowDynamicProperties]` attribute can be added to the class. The attribute will automatically be inherited by child classes. Trac ticket #56034 is open to investigate and handle the third and fourth type of situations, however it has become clear this will need more time and will not be ready in time for WP 6.1. To reduce “noise” in the meantime, both in the error logs of WP users moving onto PHP 8.2, in the test run logs of WP itself, in test runs of plugins and themes, as well as to prevent duplicate tickets from being opened for the same issue, this commit adds the `#[AllowDynamicProperties]` attribute to all “parent” classes in WP. The logic used for this commit is as follows: * If a class already has the attribute: no action needed. * If a class does not `extend`: add the attribute. * If a class does `extend`: - If it extends `stdClass`: no action needed (as `stdClass` supports dynamic properties). - If it extends a PHP native class: add the attribute. - If it extends a class from one of WP's external dependencies: add the attribute. * In all other cases: no action — the attribute should not be needed as child classes inherit from the parent. Whether or not a class contains magic methods has not been taken into account, as a review of the currently existing magic methods has shown that those are generally not sturdy enough and often even set dynamic properties (which they should not). See the [https://www.youtube.com/watch?v=vDZWepDQQVE live stream from August 16, 2022] for more details. This commit only affects classes in the `src` directory of WordPress core. * Tests should not get this attribute, but should be fixed to not use dynamic properties instead. Patches for this are already being committed under ticket #56033. * While a number bundled themes (2014, 2019, 2020, 2021) contain classes, they are not a part of this commit and may be updated separately. Reference: [https://wiki.php.net/rfc/deprecate_dynamic_properties PHP RFC: Deprecate dynamic properties]. Follow-up to [53922]. Props jrf, hellofromTonya, markjaquith, peterwilsoncc, costdev, knutsp, aristath. See #56513, #56034. Built from https://develop.svn.wordpress.org/trunk@54133 git-svn-id: http://core.svn.wordpress.org/trunk@53692 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2022-09-12 17:47:14 +02:00
#[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 );
}
}