MSC4447: Move OpenID userinfo endpoint out of /_matrix/federation#4447
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gingershaped wants to merge 3 commits into
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MSC4447: Move OpenID userinfo endpoint out of /_matrix/federation#4447gingershaped wants to merge 3 commits into
/_matrix/federation#4447gingershaped wants to merge 3 commits into
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gingershaped
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/_matrix/federation/_matrix/federation
tulir
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proposal
velikopter
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Apr 6, 2026
Co-authored-by: Helix K <vel@riseup.net>
turt2live
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Implementation requirements:
- Server (serving)
- Application (using)
turt2live
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Apr 6, 2026
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This is early review on MSC structure rather than contents
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| # MSC4447: Move OpenID userinfo endpoint out of `/_matrix/federation` | |||
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| The Matrix specification includes [an endpoint](https://spec.matrix.org/v1.17/server-server-api/#get_matrixfederationv1openiduserinfo), `/_matrix/federation/v1/openid/userinfo`, which allows a client to prove its identity to an external service. This endpoint is used by the [lk-jwt-service](https://github.com/element-hq/lk-jwt-service), among others. However, its location in the server-to-server API is strange -- it requires no authentication, and, unlike every other endpoint under `/_matrix/federation`, it isn't intended for use by other homeservers. This proposal moves it to a new endpoint prefix, `/_matrix/openid`, to separate it from the federation endpoints which it is unrelated to. | |||
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Please limit lines to ~100 characters
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| ## Unstable prefix | ||
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| No unstable name for the new endpoint is proposed, as introducing one would defeat the purpose of this proposal. Servers MAY indicate their support for this proposal by setting the `org.continuwuity.msc4447` field of `unstable_features` to `true` under [`/_matrix/client/versions`](https://spec.matrix.org/v1.17/client-server-api/#get_matrixclientversions). |
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The new path would need to be served under an unstable namespace. Though it's unlikely to change shape over the course of this MSC, it's still possible.
tonkku107
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Apr 6, 2026
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| ## Proposal | ||
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| [`GET /_matrix/federation/v1/openid/userinfo`](https://spec.matrix.org/v1.17/server-server-api/#get_matrixfederationv1openiduserinfo) is moved to a new location, `GET /_matrix/openid/v1/userinfo`. No changes are made to the behavior of the endpoint itself. The old endpoint is marked for deprecation and removal in a future version of the Matrix specification. |
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Since this endpoint is some weird cut down version of OpenID Connect, we should probably seek to replace the endpoint with the proper oauth2 next-gen auth that recently landed in the spec instead of renaming it with no changes.
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Conflict of interest declaration: I am a maintainer of the Continuwuity homeserver. This pull request was written as part of my work on Continuwuity.
Signed-off-by: Ginger ginger@gingershaped.computer