Ticket #47528: 4.diff

src/wp-admin/admin-ajax.php

@@ -137 +137 @@
         'health-check-background-updates',
         'health-check-loopback-requests',
         'health-check-get-sizes',
+        'health-check-core-integrity',
 );
 
 // Deprecated

src/wp-admin/includes/ajax-actions.php

@@ -5057 +5057 @@
 
         wp_send_json_success( $all_sizes );
 }
+
+/**
+ * Ajax handler for site health checks on code integrity.
+ *
+ * @since 5.3.0
+ */
+function wp_ajax_health_check_core_integrity() {
+        check_ajax_referer( 'health-check-site-status' );
+
+        if ( ! current_user_can( 'view_site_health_checks' ) ) {
+                wp_send_json_error();
+        }
+
+        if ( ! class_exists( 'WP_Site_Health' ) ) {
+                require_once( ABSPATH . 'wp-admin/includes/class-wp-site-health.php' );
+        }
+
+        $site_health = new WP_Site_Health();
+        wp_send_json_success( $site_health->get_test_core_integrity() );
+}
+

src/wp-admin/includes/class-wp-site-health.php

@@ -1729 +1729 @@
                 return $result;
         }
 
+        /**
+         * Scan the WordPress core files for modified and/or missing files.
+         *
+         * Files that have been modified or that have gone missing may indicate that the site
+         * has been compromised, installation failure, or that the code has been customized.
+         * Users that know the code base should be unaltered will be offered to reinstall or
+         * upgrade WordPress in response.
+         *
+         * @since 5.3.0
+         *
+         * @return array The test results.
+         */
+        public function get_test_core_integrity() {
+                $result = array(
+                        'label'       => __( 'No changes to the core files are detected' ),
+                        'status'      => 'good',
+                        'badge'       => array(
+                                'label' => __( 'Security' ),
+                                'color' => 'blue',
+                        ),
+                        'description' => __( 'A scan for changes to the core WordPress files was performed. No changes are detected.' ),
+                        'actions'     => '',
+                        'test'        => 'core_integrity',
+                );
+
+                $wp_version = get_bloginfo( 'version' );
+                $wp_locale  = get_locale();
+
+                // Retrieve a list of checksums from the remote server for verification
+
+                $checksums = get_transient( 'health-check-code-integrity-checksums' );
+                if ( false === $checksums ) {
+                        $checksums = get_core_checksums( $wp_version, $wp_locale );
+                        if ( false === $checksums && false !== strpos( $wp_version, '-' ) ) {
+                                $checksums = get_core_checksums( (float) $wp_version - 0.1, $wp_locale );
+                        }
+
+                        set_transient( 'health-check-code-integrity-checksums', $checksums, HOURS_IN_SECONDS );
+                }
+
+                if ( empty( $checksums ) ) {
+                        $result['status']      = 'critical';
+                        $result['label']       = __( 'Unable to scan core files for changes' );
+                        $result['description'] = __( 'The checksum file list could not be downloaded. There maybe a connection issue or a list is not available for this version. Please try to run this test again at a later time.' );
+                        return $result;
+                }
+
+                $changed_files = false;
+                foreach ( $checksums as $file => $checksum ) {
+
+                        if ( 0 === strncmp( $file, 'wp-content', 10 ) ) {
+                                continue;
+                        }
+
+                        if ( ! file_exists( ABSPATH . $file ) ) {
+                                $changed_files = true;
+                                break;
+                        }
+
+                        $existing_checksum = md5_file( ABSPATH . $file );
+                        if ( $existing_checksum !== $checksum ) {
+                                $changed_files = true;
+                                break;
+                        }
+
+                }
+
+                if ( true === $changed_files ) {
+
+                        $result['status'] = 'recommended';
+                        $result['label']  = __( 'Some core files may have been modified' );
+                        $result['description'] = __( 'Some WordPress core files may have been changed. One reason this check can fail is that you need to install a version that makes use of the right translation files. If you have the ability to do so, a simple fix is to reinstall WordPress. Reinstall of the core system should not affect any plugins, themes, or content that you have posted.' );
+                        $result['actions'] = sprintf(
+                                '<a href="%s">%s</a>',
+                                esc_url( admin_url( 'update-core.php?force_check=1' ) ),
+                                __( 'Reinstall WordPress manually' )
+                        );
+
+                }
+
+                return $result;
+        }
+
         /**
          * Return a set of tests that belong to the site status page.
          *
@@ -1805 +1888 @@
                                         'label' => __( 'Loopback request' ),
                                         'test'  => 'loopback_requests',
                                 ),
+                                'core_integrity'  => array(
+                                        'label' => __( 'WordPress Core Files Integrity Check' ),
+                                        'test'  => 'core_integrity'
+                                ),
                         ),
                 );