Ticket #43285: changeset_41741.diff

trunk/src/wp-admin/includes/admin-filters.php

@@ -39 +39 @@
 
 // Misc hooks.
+add_action( 'admin_init', 'wp_admin_headers'         );
+add_action( 'login_init', 'wp_admin_headers'         );
 add_action( 'admin_head', 'wp_admin_canonical_url'   );
 add_action( 'admin_head', 'wp_color_scheme_settings' );

trunk/src/wp-admin/includes/misc.php

@@ -921 +921 @@
 
 /**
+ * Send a referrer policy header so referrers are not sent externally from administration screens.
+ *
+ * @since 4.9.0
+ */
+function wp_admin_headers() {
+        $policy = 'same-origin';
+
+        /**
+         * Filters the admin referrer policy header value. Default 'same-origin'.
+         *
+         * @since 4.9.0
+         * @link https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy
+         *
+         * @param string $policy The referrer policy header value.
+         */
+        $policy = apply_filters( 'admin_referrer_policy', $policy );
+
+        header( sprintf( 'Referrer-Policy: %s', $policy ) );
+}
+
+/**
  * Outputs JS that reloads the page if the user navigated to it with the Back or Forward button.
  *