this post was submitted on 11 Jul 2023
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Self-hosted lemmy without serving arbitrary federated content? (reddthat.com)
submitted 1 year ago by [email protected] to c/selfhosted
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I want to self-host lemmy and participate in federation. However, I wonder whether it's possible to have a setup where only I, and trusted users, are allowed to browse federated-content.

Basically, guests should not be allowed to use my instance to browse other federated content. So requests to "mydomain.tld/c/[email protected]" should not be possible. Only users, logged-in on my instance, should be able to do that.

Despite that, guests should be allowed to see posts of communities posted on my instance, and users of other instances should be allowed to comment.

I know I can choose with which other instances mine should link with, but this would make the experience inconvenient to me. Because then I would need to adjust the config if I want to subscribe to a community on an instance I have not yet linked with.

Is such setup possible? Could not find the answer in the docs unfortunately

The only thing I can think of is something like blocking UI requests, and allow them only from localhost (so I would create a "ssh -L" tunnel on the server). Federation API endpoints would not be blocked. But this seems shaky, does Lemmy support a cleaner, built-in solution?

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[–] [email protected] 6 points 1 year ago

I said it in a higher comment with other info but try looking up a remote community that isn't already known by an instance, without being logged in. It won't look it up for you and just silently fail. If unwanted content is what you're worried about unfortunately a malicious actor can basically just drop content directly into your instance without prior notice if your federation is open. This is why db0 is working on systems that will in the future work like shared blacklists (opt-in of course).