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<?php |
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|
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// Do not allow the file to be called directly. |
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if ( ! defined( 'ABSPATH' ) ) { |
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exit; |
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} |
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|
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/** |
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* This class is used to provide several hardening options. |
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*/ |
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class P_Hardening extends P_Core { |
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|
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/** |
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* Add the actions required for the hardening of the site. |
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* |
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* @param Patchstack $core |
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* @return void |
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*/ |
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public function __construct( $core ) { |
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parent::__construct( $core ); |
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|
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// Auto update plugins. |
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add_action( 'patchstack_update_plugins', [ $this, 'update_vulnerable_plugins' ] ); |
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|
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// The hardening features can only be used on an activated license. |
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if ( ! $this->license_is_active() || $this->get_option( 'patchstack_license_free', 0 ) == 1 ) { |
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return; |
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} |
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|
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// Disallowed modification of the theme files? |
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if ( ! defined( 'DISALLOW_FILE_EDIT' ) && $this->get_option( 'patchstack_pluginedit', true ) ) { |
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define( 'DISALLOW_FILE_EDIT', 1 ); |
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} |
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|
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// Set security headers |
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add_filter( 'wp_headers', [ $this, 'set_security_headers' ], 10, 1 ); |
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|
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// Apply comment captcha? |
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if ( $this->get_option( 'patchstack_captcha_on_comments', 0 ) && ! is_user_logged_in() ) { |
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add_action( 'comment_form_after_fields', [ $this, 'captcha_display' ] ); |
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add_filter( 'preprocess_comment', [ $this, 'verify_recaptcha' ] ); |
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} |
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|
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// Disable the application passwords feature? |
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if ( $this->get_option( 'patchstack_application_passwords_disabled', false ) == true ) { |
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add_filter( 'wp_is_application_passwords_available', '__return_false' ); |
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} |
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|
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// Block unauthorized XML-RPC requests? |
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if ( $this->get_option( 'patchstack_xmlrpc_is_disabled', false ) == true ) { |
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add_filter( 'xmlrpc_enabled', '__return_false' ); |
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} |
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|
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// Block unauthorized wp-json requests? |
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if ( $this->get_option( 'patchstack_json_is_disabled', false ) ) { |
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add_filter( 'rest_authentication_errors', [ $this, 'disable_wpjson' ] ); |
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} |
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|
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// Prevent user enumeration? |
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if ( $this->get_option( 'patchstack_userenum' ) ) { |
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add_action( 'init', [ $this, 'stop_user_enum' ], 1 ); |
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} |
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|
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// Attempt to hide the WordPress version? |
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if ( $this->get_option( 'patchstack_hidewpversion' ) ) { |
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remove_action( 'wp_head', 'wp_generator' ); |
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add_filter( 'the_generator', [ $this, 'remove_generator' ] ); |
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} |
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|
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// Auto update software? |
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$update = get_site_option( 'patchstack_auto_update', [] ); |
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if ( is_array( $update ) ) { |
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foreach ( $update as $type ) { |
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if ( $type != 'vulnerable' ) { |
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add_filter( 'auto_update_' . $type, '__return_true' ); |
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} |
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} |
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} |
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} |
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|
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/** |
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* Perform updates if the software upload call returns vulnerabilities. |
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* This is only executed when auto updates are enabled for vulnerable plugins. |
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* |
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* @param array $plugins |
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* @return void |
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*/ |
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public function update_vulnerable_plugins() { |
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// Is the auto update setting for vulnerable plugins enabled? |
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$update = get_site_option( 'patchstack_auto_update', [] ); |
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if ( ! is_array( $update ) || ! in_array( 'vulnerable', $update ) ) { |
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return; |
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} |
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|
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// Do we even have any vulnerable plugins to auto update? |
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$plugins = get_site_option( 'patchstack_vulnerable_plugins', [] ); |
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if ( ! is_array( $plugins ) || count( $plugins ) == 0 ) { |
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return; |
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} |
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|
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// Might not be necessary, but should prevent any hanging issues. |
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@set_time_limit( 180 ); |
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|
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// Require some files we need to execute the upgrade. |
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@include_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php'; |
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if ( file_exists( ABSPATH . 'wp-admin/includes/class-plugin-upgrader.php' ) ) { |
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@include_once ABSPATH . 'wp-admin/includes/class-plugin-upgrader.php'; |
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} |
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|
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@include_once ABSPATH . 'wp-admin/includes/plugin.php'; |
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@include_once ABSPATH . 'wp-admin/includes/misc.php'; |
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@include_once ABSPATH . 'wp-admin/includes/file.php'; |
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@wp_update_plugins(); |
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$all_plugins = get_plugins(); |
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|
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// New array with all available plugins and the ones we want to upgrade. |
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$upgrade = []; |
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foreach ( $all_plugins as $path => $data ) { |
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if ( in_array( $path, $plugins ) ) { |
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array_push( $upgrade, $path ); |
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} |
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} |
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|
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// Upgrade the plugins. |
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$upgrader = new Plugin_Upgrader( new Automatic_Upgrader_Skin() ); |
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$upgrader->bulk_upgrade( $upgrade ); |
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|
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// Reset the option that holds the vulnerable plugins. |
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update_site_option( 'patchstack_vulnerable_plugins', [] ); |
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|
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// Resend the sofware data to the API. |
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do_action( 'patchstack_send_software_data' ); |
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} |
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|
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/** |
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* Prevent unauthorized users from accessing wp-json. |
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* |
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* @return void|WP_Error |
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*/ |
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public function disable_wpjson() { |
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// Some default exceptions. |
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$path = isset( $_SERVER['REQUEST_URI'] ) ? (string) parse_url( $_SERVER['REQUEST_URI'], PHP_URL_PATH ) : ''; |
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$whitelists = [ '/wp-json/contact-form-7/' ]; |
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foreach ( $whitelists as $whitelist ) { |
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if ( stripos( $path, $whitelist ) !== false ) { |
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return; |
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} |
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} |
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|
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// Block unauthorized users. |
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if ( ! is_user_logged_in() ) { |
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$msg = apply_filters( 'disable_wp_rest_api_error', esc_attr__( 'The WP REST API cannot be accessed by unauthorized users.', 'disable-wp-rest-api' ) ); |
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return new WP_Error( 'rest_authorization_required', $msg, [ 'status' => rest_authorization_required_code() ] ); |
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} |
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} |
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|
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/** |
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* Set security headers if the option is enabled. |
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* |
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* @param array $headers |
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* @return void|array |
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*/ |
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public function set_security_headers( $headers ) { |
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if ( get_option( 'patchstack_add_security_headers' ) ) { |
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$headers['Referrer-Policy'] = 'strict-origin-when-cross-origin'; |
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$headers['X-Frame-Options'] = 'SAMEORIGIN'; |
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$headers['X-XSS-Protection'] = '1; mode=block'; |
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$headers['X-Content-Type-Options'] = 'nosniff'; |
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$headers['X-Powered-By'] = null; |
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$headers['Server'] = null; |
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$headers['Strict-Transport-Security'] = 'max-age=31536000'; |
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} |
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|
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return $headers; |
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} |
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|
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/** |
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* Determine if the reCAPTCHA is valid upon comment submission. |
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* |
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* @param array $comment_data |
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* @return void|array |
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*/ |
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public function verify_recaptcha( $comment_data ) { |
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$result = $this->captcha_check(); |
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if ( ! $result['response'] && ( $result['reason'] === 'VERIFICATION_FAILED' || $result['reason'] === 'RECAPTCHA_EMPTY_RESPONSE' ) ) { |
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wp_clear_auth_cookie(); |
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wp_die( 'reCaptcha was not solved or response was empty', 'Error' ); |
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} |
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|
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return $comment_data; |
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} |
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|
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/** |
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* Add the captcha to the comments form. |
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* |
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* @return void |
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*/ |
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public function captcha_display() { |
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switch ( $this->get_option( 'patchstack_captcha_type' ) ) { |
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case 'v2': |
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$site_key = trim( $this->get_option( 'patchstack_captcha_public_key' ) ); |
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require dirname( __FILE__ ) . '/views/captcha_v2.php'; |
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break; |
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case 'invisible': |
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$site_key = trim( $this->get_option( 'patchstack_captcha_public_key_v3' ) ); |
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require dirname( __FILE__ ) . '/views/captcha_invisible.php'; |
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break; |
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case 'v3': |
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$site_key = trim( $this->get_option( 'patchstack_captcha_public_key_v3_new' ) ); |
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require dirname( __FILE__ ) . '/views/captcha_v3.php'; |
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break; |
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case 'turnstile': |
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$site_key = trim( $this->get_option( 'patchstack_captcha_public_key_turnstile' ) ); |
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require dirname( __FILE__ ) . '/views/captcha_turnstile.php'; |
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break; |
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} |
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} |
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|
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/** |
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* Check if the submitted reCAPTCHA is valid. |
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* |
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* @return array |
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*/ |
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public function captcha_check() { |
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$secret_key = ''; |
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$site_key = ''; |
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switch ( $this->get_option( 'patchstack_captcha_type' ) ) { |
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case 'v2': |
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$secret_key = trim( $this->get_option( 'patchstack_captcha_private_key' ) ); |
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$site_key = trim( $this->get_option( 'patchstack_captcha_public_key' ) ); |
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break; |
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case 'invisible': |
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$secret_key = trim( $this->get_option( 'patchstack_captcha_private_key_v3' ) ); |
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$site_key = trim( $this->get_option( 'patchstack_captcha_public_key_v3' ) ); |
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break; |
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case 'v3': |
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$secret_key = trim( $this->get_option( 'patchstack_captcha_private_key_v3_new' ) ); |
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$site_key = trim( $this->get_option( 'patchstack_captcha_public_key_v3_new' ) ); |
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break; |
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case 'turnstile': |
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$secret_key = trim( $this->get_option( 'patchstack_captcha_private_key_turnstile' ) ); |
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$site_key = trim( $this->get_option( 'patchstack_captcha_public_key_turnstile' ) ); |
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break; |
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} |
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|
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if ( ! $secret_key || ! $site_key ) { |
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return [ |
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'response' => false, |
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'reason' => 'ERROR_NO_KEYS', |
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]; |
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} |
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|
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if ( ! isset( $_POST['g-recaptcha-response'] ) || empty( $_POST['g-recaptcha-response'] ) ) { |
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return [ |
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'response' => false, |
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'reason' => 'RECAPTCHA_EMPTY_RESPONSE', |
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]; |
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} |
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|
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$response = $this->get_captcha_response( $secret_key, $this->get_option( 'patchstack_captcha_type' ) ); |
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if ( isset( $response['success'] ) && ! empty( $response['success'] ) ) { |
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return [ |
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'response' => true, |
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'reason' => '', |
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]; |
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} |
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|
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return [ |
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'response' => false, |
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'reason' => 'VERIFICATION_FAILED', |
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]; |
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} |
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|
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/** |
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* Query Google for reAPTCHA validation and response. |
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* |
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* @param string $privatekey |
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* @param string $type |
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* @return array |
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*/ |
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public function get_captcha_response( $privatekey, $type ) { |
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$args = [ |
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'body' => [ |
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'secret' => $privatekey, |
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'response' => $_POST['g-recaptcha-response'], |
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], |
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]; |
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|
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if ($type != 'turnstile') { |
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$resp = wp_remote_post( 'https://www.google.com/recaptcha/api/siteverify', $args ); |
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} else { |
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$resp = wp_remote_post( 'https://challenges.cloudflare.com/turnstile/v0/siteverify', $args ); |
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} |
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|
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return json_decode( wp_remote_retrieve_body( $resp ), true ); |
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} |
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|
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/** |
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* Disable user enumeration with ?author= and the REST endpoint. |
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* |
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* @return void |
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*/ |
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public function stop_user_enum() { |
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if ( isset( $_GET['author'] ) && ! is_user_logged_in() && ! is_admin() ) { |
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die( wp_safe_redirect( get_site_url() ) ); |
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} |
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|
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if ( ( isset( $_SERVER['REQUEST_URI'] ) && stripos( $_SERVER['REQUEST_URI'], 'v2/users' ) !== false ) || ( isset( $_REQUEST['rest_route'] ) && stripos( $_REQUEST['rest_route'], 'v2/users' ) !== false ) ) { |
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if ( ! is_user_logged_in() ) { |
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die( wp_safe_redirect( get_site_url() ) ); |
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} |
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} |
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} |
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|
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/** |
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* Hide the WordPress generator version in response. |
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* |
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* @return string |
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*/ |
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public function remove_generator() { |
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return ''; |
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} |
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} |
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|
