This is the proposed FEP-61cf: The OpenWebAuth Protocol. OpenWebAuth is the “single sign-on” mechanism used by Hubzilla, (streams) and other related projects. It allows a browser-based user to log in to services across the Fediverse using a single identity. Once logged in, they can be recognised by other OpenWebAuth-compatible services, ...
This looks really odd in relation to other fediverse software; Why /magic and required to be on the root of the domain? Why hard-require routing the domain part of the user ID when .well-known/webfinger exists? Why is there a X-Open-Web-Auth header which the spec only describes as “its purpose is unclear from the code”?
So many questions.
I definitely like the idea of distributed sign-in, Solid did a decent work of that many years ago after all. This particular proposal just looks rather odd.
OpenWebAuth has been in use on the fediverse since before WebFinger became so widely used.
Like I said in a previous comment, this FEP was written by reverse engineering the existing implementation. It's still a proposal so it still has to go through a discussion period where issues like this can be worked out and it can be updated
The proposal fails to sufficiently motivate why existing protocols like OpenId Connect can’t be used given that trusting the user’s home instance seems necessary with this protocol too. The name also is confusingly close to WebAuthn.
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