CSP for Single Page Applications

Introduction

Content Security Policy (CSP) is a powerful security feature that helps prevent a variety of attacks, including Cross-Site Scripting (XSS) and data injection attacks, by controlling which resources can be loaded by a web page. This lesson will delve into how CSP can be effectively implemented in Single Page Applications (SPAs).

What is CSP?

CSP is a security standard that allows web developers to specify which content sources are trusted. It is implemented via HTTP headers or `` tags in HTML.

CSP in SPAs

SPAs rely heavily on JavaScript, which can introduce vulnerabilities if not managed carefully. Implementing CSP in SPAs requires careful consideration of dynamic content and inline scripts.

Implementing CSP

1. Define a CSP policy in your HTTP headers or `` tag.
2. Specify allowed sources for scripts, styles, images, etc.
3. Test your CSP policy using browser developer tools to ensure it does not block legitimate content.

        Content-Security-Policy: default-src 'self'; script-src 'self' https://apis.example.com; style-src 'self' https://fonts.googleapis.com;
        

Best Practices

• Use strict CSP directives to minimize exposure.
• Regularly review and update your CSP policy.
• Utilize the `report-uri` directive to receive violation reports.
• Avoid using `unsafe-inline` and `unsafe-eval` unless absolutely necessary.

FAQ