Given the US recently made a bid to fast-track multiple censorship bills, KOSA included, and is also trying to kill Section 230 now, which will pose an existential threat to Fediverse instances hosted over the clearnet, how feasible would it be to host said instances over Tor/I2P?
Javascript will be an issue
That’s just a frontend issue. You can have clients that don’t try to do regular polling.
Having reliable activitypub federation is going to be a much harder challenge. The server to server protocol has a bunch of assumptions that are not true for tor and i2p.
And unless you want the entire network to become a CSAM and Nazi cespool, you would also need a reliable way of identifying servers, which defeats the purpose.
Could you please elaborate just a bit? I’m a web dev, but haven’t looked into fediverse protocols yet.
One example is HTTP signatures. Servers sign their payloads and receiving servers should validate not just the hash but ensure the payload is not too old. Mastodon allows for a twelve hour difference (https://docs.joinmastodon.org/spec/security/#http-signatures) but other software might be stricter for security reasons. The a bunch of things like webfinger were designed around public dns and public key chains A mastodon server running on the open internet and/or expecting public keychain HTTPs will not be able to federate with something running in tor.
You could cut enough corners to make something that federates inside tor, but at that point it’s better to design something around tor’s features.
Why is it the first time I hear of this?
Ah, because it’s apparently a fresh proposal, perhaps from Mastodon themselves.
https://www.w3.org/wiki/ActivityPub/Primer/Authentication_Authorization mentions HTTP signatures since the very first version of the document in 2017. The current efforts seem more in the direction of describing standardizing the existing usage.
APIs should work, though. So unless the instance needs some kinda captcha or other client-side challenge, e.g. for registration, people could presumably use apps with it.
Plus, if the aim is just to reach and use the instances, and not to be anonymous, then one could probably use a regular browser with a Tor proxy (Firefox can do it per site with both proxy-switching extensions and containers). Assuming that domain resolution would work.
However, in my experience, not many social-media-adjacent apps support setting a custom proxy, even though modern network libraries should make it a no-brainer. E.g. few Matrix clients support that, and ones that do aren’t much of an eye candy (and have problems with the initial setup of the encryption, which seems to be a pervasive issue with Matrix).