How can I configure Helmet JS CSP to permit external CSS and JavaScript scripts? I'm also wondering about the whereabouts of the inline

I'm fairly new to the world of JavaScript and ExpressJS. My goal is to create a web application with a working login page. I'm currently in the process of setting up the helmet JS middleware to allow for external CSS and scripts. However, despite my efforts, I keep encountering this issue:

Content-Security-Policy: The page’s settings blocked an inline script (script-src-elem) from being executed because it violates the following directive: “script-src 'self'”
.

I'm having trouble pinpointing where exactly the inline script is located within my HTML file.

Here's a breakdown of my folder structure:

-> public
    -> Login_Page_template
        - logo.jpg
        - login_page_client.js
        - static_login_page.html
        - static_login_styles.css
-> src
    -> routes
        - LOGIN_PAGE.js

- Entry_Point.js

The contents of Entry_Point.js are as follows:

// Date Created: September 11 2024
// Date Last Updated: September 23 2024 

const express = require("express");
<!-- More code here -->

LOGIN_PAGE.js consists of:

// Date Created: September 16 2024
// Date Last Updated: September 24 2024

const express = require("express");
<!-- More code here -->

As for the content of static_login_page.html:

<!DOCTYPE html>
<html lang="en">
<head>
<!-- HTML content goes here -->

And the JavaScript code in login_page_client.js:

// Date Created: July 23 2024
// Date Last Updated: August 26 2024

const login_form = document.querySelector('form');
<!-- More JavaScript code here -->

One observation worth noting is that when I apply the styles using Fire Fox's append style sheet option, the styles load without any issue or error.

Answer №1

Hi there, I specialize in maintaining helmets. From what I can see, a part of the issue may lie here:

app.use(helmet({
    contentSecurityPolicy:true,
    directives: cspConfig.directives,
}));

To resolve this, it should be adjusted to:

app.use(helmet({
  contentSecurityPolicy: cspConfig,
}));

If you are loading a script from an external source or using inline scripts, your CSP directives will need to be updated accordingly.

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