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Frontend communicates to backend. I am a developer of frontend and backend. I want to protect my app (prohibit end user from using my app without paying). The only thing I have in mind is to have some middle point, some my server. Frontend send some encoded request to my server, there request is being transformed in a form, that backend could understand. and only then backend can answer to frontend directly without my server as intermediary in communication chain. Client make request to my server, but get data directly from backend which is located on his side. I am not getting any private client information, but I have ability to protect app. Is it correct way? How it is usually done? Frontend - react app, backend - php.

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My question in another words. I've created an app. It consits of two parts: frontend (React) and backend (Laravel). I would like to make it paid for end users. How it is usually done? Usually you put backend on some cloud server (Amazon for example), then users log in to your frontend and use your app (saas). Thus your app is good enough protected: backend is on server, to which only you have access. My app should be fully installed on client's server, both: frontend and backend. So the client can see backend code and frontend code. I need somehow to protect my app in such situation. Above I described my thoughs about how I could do it.

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    I don't understand your scenario TBH. Maybe try to describe it more and split your text into a couple distinct paragraphs. – The Fool Feb 10 at 17:05
  • Ok, thank you, I'll extend my question. – John Smith Feb 10 at 18:15
  • You can't. Microsoft's been trying this for 25 years with Windows. It hasn't worked for them. It won't work for you. – vidarlo Feb 19 at 16:14
  • When you say the client can see the backend code, can they modify the source code? Or are you saying that they just have access to it and can see what is goign on? – Limit Feb 19 at 17:21
  • Also, while your application is running locally, can you make requests to a central server? Say for authentication/authorization? – Limit Feb 19 at 17:21
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This is always a tricky question, and from an attackers view, it is always possible to reverse engineer your "backend", if you provide it to run locally at the attackers server.

You could use some obfuscators and anti debugging frameworks (usually one doesn't implement this from scratch) to make it more difficult to get the data out of the app, however it doesn't make successfull attacks impossible but depending on the value of your "backend" logic it may be enough protection. But using function hooking techniques it may not even be necessary to reverse engineer your code.

If your backend is of high value, there won't be a suitable solution where you run it in an untrusted environment.

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