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Clarify when an event is returned from /send_join. #1840

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merged 3 commits into from
Jun 11, 2024

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clokep
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@clokep clokep commented Jun 5, 2024

field. The signed copy of the membership event sent to other servers by the resident server,
including the resident server's signature.
The signed copy of the membership event sent to other servers by the resident server.
Required if the event is signed by the resident server.
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So as the sender of the /send_join request, should we still ensure that the signed event is present when performing a restricted join, as it must be signed in this case?

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What do you mean by present? Present when you get the room state?

As the joining server I think the important things to do are:

  1. Verify the signatures as with any event.
  2. Ensure this copy of the event is persisted locally and not the copy that was used to make the /send_join call.

I'd have to double check what synapse does to see if there's anything else though.

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@Kladki Kladki Jun 5, 2024

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What do you mean by present?

The signed event being returned in the event field of the response.

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The signature needs to be checked (as is in the auth rules), Synapse does this @ https://github.com/matrix-org/synapse/blob/23740eaa3da94fbe2e25180376961979fc4e8cd3/synapse/federation/federation_base.py#L238-L259.

I'm still unsure if that's your question or not though.

field. The signed copy of the membership event sent to other servers by the resident server,
including the resident server's signature.
The signed copy of the membership event sent to other servers by the resident server.
Required if the event is signed by the resident server.
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Hrm. I think we need to clarify this a bit more. It just begs the question, "so when should the event be signed by the resident server".

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Would linking back to restricted joins be enough?

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Probably?

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I took another attempt at this, let me know what you think.

@clokep clokep requested a review from richvdh June 10, 2024 14:47
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LGTM

@clokep clokep merged commit a7a7ead into matrix-org:main Jun 11, 2024
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@clokep clokep deleted the clokep/send-join-event branch June 11, 2024 17:02
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Clarify that join events only need to be signed by resident servers if using join_authorised_via_users_server
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