I'm developing a Chrome extension that relies on a Flask backend to function properly, mainly because the library I need isn't available in JavaScript. I'm concerned about deploying this backend, as putting it online might expose it to users who could make unauthorized requests, especially if my extension gains traction. I want to restrict access so that only my extension can use it. What are some strategies or best practices for protecting a backend API in this situation?
4 Answers
It's important to know that there’s no true way to ensure your backend can only be hit by your extension. A determined hacker could always find a way around it. Instead, focus on building a robust authentication system that links requests to user accounts. That way, you can track usage and block any suspicious activity.
Most companies secure their backends by hosting them on private networks, like intranets or VPNs, which prevents outside access. If your API is public-facing, implementing authentication and authorization measures is vital to control who can access it.
In general, you should implement user authentication to access the API endpoints. This way, even if someone has the URL, they won't be able to interact with the backend without proper credentials. Additionally, rate limiting can help prevent abuse by controlling how many requests a user can make.
The backend I work with is hosted on AWS, using a Virtual Private Cloud (VPC) setup. This means it doesn't have public IPs, and any access has to go through a public API layer that properly authenticates users before passing requests to the backend. It's a solid way to keep the backend safe.
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