What is the process for implementing a Content Security Policy to enable the loading of external JS files from a CDN in ExpressJS?

When working with ExpressJS, the HTML file is loaded in the following manner:

app.use(express.static(__dirname + '/src/templates/'));

Within the HTML file, here is an example of a meta tag containing Content Security Policy:

<meta http-equiv="Content-Security-Policy" content="default-src 'self' https://cdnjs.cloudflare.com 'unsafe-inline' 'unsafe-eval' fonts.gstatic.com fonts.googleapis.com kit.fontawesome.com; img-src 'self' data:; object-src 'none'; require-trusted-types-for 'script'; script-src 'self' cdnjs.cloudflare.com">

The goal is to load external JS files as shown below:

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://kit.fontawesome.com/a4ff515084.js" crossorigin="anonymous"></script>

Despite specifying these external sources in the CSP meta tag, errors are encountered and the external JS files fail to load properly.

https://i.stack.imgur.com/KmfOl.png

Upon further investigation, certain issues have been identified:

https://i.stack.imgur.com/10eM4.png

Any assistance on resolving this matter would be greatly appreciated.

javascriptexpresscontent-security-policy

Answer №1

You are currently implementing 2 Content Security Policies simultaneously:

  1. The first one is set via the 
    <meta http-equiv="Content-Security-Policy" content="...">
    tag.
  2. The second one is generated by Helmet 4 (utilizing the default CSP feature).

Rules from both CSPs are combined using logical "AND", meaning the stricter of the two policies will be enforced.

To avoid conflicts, it is recommended to configure the CSP HTTP header using Helmet or the meta tag, but not both simultaneously.

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