rspec/rules/S5736/javascript/rule.adoc

include::../description.adoc[]

include::../ask-yourself.adoc[]

include::../recommended.adoc[]

== Sensitive Code Example

In Express.js application the code is sensitive if the https://www.npmjs.com/package/helmet[helmet] `+referrerPolicy+` middleware is disabled or used with `+no-referrer-when-downgrade+` or `+unsafe-url+`:

----
const express = require('express');
const helmet = require('helmet');

app.use(
  helmet.referrerPolicy({ 
    policy: 'no-referrer-when-downgrade' // Sensitive: no-referrer-when-downgrade is used
  })
);
----

== Compliant Solution

In Express.js application a secure solution is to user the https://www.npmjs.com/package/helmet[helmet] referrer policy middleware set to `+no-referrer+`:

----
const express = require('express');
const helmet = require('helmet');

let app = express();

app.use(
  helmet.referrerPolicy({
    policy: 'no-referrer' // Compliant
  })
); 
----

include::../see.adoc[]