ContentSecurityPolicy.md

Content Security Policy (CSP)

DockFlare's Web UI implements a Content Security Policy (CSP).

What is CSP?

Content Security Policy is an added layer of security that helps to detect and mitigate certain types of attacks, including Cross-Site Scripting (XSS) and data injection attacks. It works by specifying the domains that the browser should consider to be valid sources of executable scripts, stylesheets, images, etc.

Why is it included in DockFlare?

1. Security: It enhances the security of the Web UI itself by restricting where resources (like JavaScript, CSS) can be loaded from, reducing the risk of malicious content injection if any vulnerabilities were ever present.
2. Reverse Proxy Compatibility: Modern web applications, especially those served behind reverse proxies, often need proper CSP headers to function correctly. Including a sensible default CSP helps ensure the DockFlare Web UI works reliably in various deployment scenarios, including those involving proxies like Nginx, Traefik, or Caddy. It helps prevent issues where a proxy might interfere with resource loading if CSP headers are missing or too restrictive.
3. Best Practice: Implementing CSP is considered a good security practice for web applications.

Implications

• For most users, the built-in CSP should be transparent and require no specific action.
• If you are accessing the DockFlare Web UI through a particularly restrictive reverse proxy or network environment that modifies or adds its own strict CSP headers, you might need to adjust the proxy's configuration to allow the resources required by the DockFlare UI (typically loaded from the same origin). The specifics depend heavily on your proxy setup.
• The primary goal is to ensure that all necessary JavaScript and CSS for the UI can load correctly from the DockFlare server itself.