this post was submitted on 05 Jul 2023
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Asklemmy
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This isn't true since your single user instance is federated. For example, this comment is going to end up on your instance, and it could have my personal data.
edit: here's a meta-link to this comment on your instance: https://lemmy.cwagner.me/comment/2786 -- despite it originating from lemmy.one and the post being lemmy.ml from a user on lemmy.world (interestingly every person involved in this interaction is on a different instance)
You can disable most endpoints in your application firewall, or put them behind a whitelist. For federation to succeed you don't need all that many publicly reachable endpoints (mostly a bunch of inboxes and the data for your own user account).
I don't think the privacy policy is sufficient. My post will end up on your server but also on the server this community is hosted on, from which it'll end up on hundreds or thousands of other servers. I've never agreed to any of their privacy policies and terms of service and neither has anyone else here.
The concept of the Fediverse doesn't work well with traditional corporate interpretations of privacy law. Going strictly by the way it's interpreted for traditional social media, you're on the hook for any personal data your private instance stores and makes available. This approach effectively kills the concept of the Fediverse, so I sort of fear the inevitable DPA investigation and/or lawsuits.
I don't have a guide for you, sorry. I've looked into it briefly but I can't say I care enough to fix it.
I'm pretty sure you'll be able to go federation only by blocking everything that's not an application/ld+jsoncontent type (technically application/ld+json; profile="https://www.w3.org/ns/activitystreams" but some servers don't send the correct Accept headers). The Lemmy frontend submits plain JSON and POST requests and it doesn't implement the client-server ActivityPub API, so that should be the easiest way to keep federation working while whitelisting your personal IP addresses.