diff --git a/proposals/3173-expose-stripped-state-events.md b/proposals/3173-expose-stripped-state-events.md index 0a660926..e35e0816 100644 --- a/proposals/3173-expose-stripped-state-events.md +++ b/proposals/3173-expose-stripped-state-events.md @@ -84,7 +84,7 @@ include the following as stripped state events: This also implies that the above information is available to any potential joiner in the API proposed in [MSC2946: Spaces summary](https://github.com/matrix-org/matrix-doc/pull/2946). -I.e. rooms which could be joined due to [MSC3083](https://github.com/matrix-org/matrix-doc/pull/3083) +E.g. rooms which could be joined due to [MSC3083](https://github.com/matrix-org/matrix-doc/pull/3083) can expose the information available in stripped state events. ## Potential issues @@ -99,29 +99,6 @@ knocking. ## Security considerations -The server-server API discussed in [MSC2946](https://github.com/matrix-org/matrix-doc/pull/2946) -does not know the user who is requesting a summary of the space, but should divulge -the above information if any member of a server could see it. It is up to the -calling server to properly filter this information. - -Consider that Alice and Bob share a server; Alice is a member of a space, but Bob -is not. The remote server will not know whether the request is on behalf of Alice -or Bob (and hence whether it should share details of private rooms within that -space). - -Trust is placed in the calling server: if there are any users on the calling -server in the correct space, that calling server has a right to know about the -rooms in that space and should return the relevant summaries, along with enough -information that the calling server can then do some filtering. - -(The alternative, where the calling server sends the requesting `user_id`, and -the target server does the filtering, is unattractive because it rules out a -future world where the calling server can cache the result.) - -This does not decrease security since a server could lie and make a request on -behalf of a user in the proper space to see the given information. I.e. the -calling server must be trusted anyway. - ## Future extensions Dedicated client-server and server-server APIs could be added to request the