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Add config option for e2e group call signalling #2492

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merged 1 commit into from
Jul 5, 2022

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@dbkr dbkr commented Jul 4, 2022


Here's what your changelog entry will look like:

✨ Features

  • Add config option for e2e group call signalling (#2492).

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Would it make more sense for this to be a per-call setting?

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dbkr commented Jul 4, 2022

So the reason I didn't do it per-call or anywhere in the signalling is because that then allows the server to do a downgrade attack. This feels a bit harder to force clients to downgrade to not using encryption.

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So the reason I didn't do it per-call or anywhere in the signalling is because that then allows the server to do a downgrade attack. This feels a bit harder to force clients to downgrade to not using encryption.

Sorry, I am not very familiar with this, so I am not seeing how exactly this should happen; though my main concern now is element-hq/element-call#438 (comment)

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dbkr commented Jul 5, 2022

So if we encode whether the call should be encrypted anywhere in the call state event, the server will be able to change it (or serve a slightly modified state event down the sync stream to a client) to make clients disable encryption. The the HS admin can intercept the traffic and spy on the call.

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LGTM and thank you for answering all my questions!

@dbkr dbkr merged commit 9a15094 into robertlong/group-call Jul 5, 2022
@dbkr dbkr deleted the dbkr/group_call_e2e_config branch July 5, 2022 12:17
su-ex added a commit to SchildiChat/matrix-js-sdk that referenced this pull request Nov 25, 2022
* Make calls go back to 'connecting' state when media lost ([\matrix-org#2880](matrix-org#2880)).
* Add ability to send unthreaded receipt ([\matrix-org#2878](matrix-org#2878)).
* Add way to abort search requests ([\matrix-org#2877](matrix-org#2877)).
* sliding sync: add custom room subscriptions support ([\matrix-org#2834](matrix-org#2834)).
* webrtc: add advanced audio settings ([\matrix-org#2434](matrix-org#2434)). Contributed by @MrAnno.
* Add support for group calls using MSC3401 ([\matrix-org#2553](matrix-org#2553)).
* Make the js-sdk conform to tsc --strict ([\matrix-org#2835](matrix-org#2835)). Fixes matrix-org#2112 matrix-org#2116 and matrix-org#2124.
* Let leave requests outlive the window ([\matrix-org#2815](matrix-org#2815)). Fixes element-hq/element-call#639.
* Add event and message capabilities to RoomWidgetClient ([\matrix-org#2797](matrix-org#2797)).
* Misc fixes for group call widgets ([\matrix-org#2657](matrix-org#2657)).
* Support nested Matrix clients via the widget API ([\matrix-org#2473](matrix-org#2473)).
* Set max average bitrate on PTT calls ([\matrix-org#2499](matrix-org#2499)). Fixes element-hq/element-call#440.
* Add config option for e2e group call signalling ([\matrix-org#2492](matrix-org#2492)).
* Enable DTX on audio tracks in calls ([\matrix-org#2482](matrix-org#2482)).
* Don't ignore call member events with a distant future expiration date ([\matrix-org#2466](matrix-org#2466)).
* Expire call member state events after 1 hour ([\matrix-org#2446](matrix-org#2446)).
* Emit unknown device errors for group call participants without e2e ([\matrix-org#2447](matrix-org#2447)).
* Mute disconnected peers in PTT mode ([\matrix-org#2421](matrix-org#2421)).
* Add support for sending encrypted to-device events with OLM ([\matrix-org#2322](matrix-org#2322)). Contributed by @robertlong.
* Support for PTT group call mode ([\matrix-org#2338](matrix-org#2338)).
* Fix registration add phone number not working ([\matrix-org#2876](matrix-org#2876)). Contributed by @bagvand.
* Use an underride rule for Element Call notifications ([\matrix-org#2873](matrix-org#2873)). Fixes element-hq/element-web#23691.
* Fixes unwanted highlight notifications with encrypted threads ([\matrix-org#2862](matrix-org#2862)).
* Extra insurance that we don't mix events in the wrong timelines - v2 ([\matrix-org#2856](matrix-org#2856)). Contributed by @MadLittleMods.
* Hide pending events in thread timelines ([\matrix-org#2843](matrix-org#2843)). Fixes element-hq/element-web#23684.
* Fix pagination token tracking for mixed room timelines ([\matrix-org#2855](matrix-org#2855)). Fixes element-hq/element-web#23695.
* Extra insurance that we don't mix events in the wrong timelines ([\matrix-org#2848](matrix-org#2848)). Contributed by @MadLittleMods.
* Do not freeze state in `initialiseState()` ([\matrix-org#2846](matrix-org#2846)).
* Don't remove our own member for a split second when entering a call ([\matrix-org#2844](matrix-org#2844)).
* Resolve races between `initLocalCallFeed` and `leave` ([\matrix-org#2826](matrix-org#2826)).
* Add throwOnFail to groupCall.setScreensharingEnabled ([\matrix-org#2787](matrix-org#2787)).
* Fix connectivity regressions ([\matrix-org#2780](matrix-org#2780)).
* Fix screenshare failing after several attempts ([\matrix-org#2771](matrix-org#2771)). Fixes element-hq/element-call#625.
* Don't block muting/unmuting on network requests ([\matrix-org#2754](matrix-org#2754)). Fixes element-hq/element-call#592.
* Fix ICE restarts ([\matrix-org#2702](matrix-org#2702)).
* Target widget actions at a specific room ([\matrix-org#2670](matrix-org#2670)).
* Add tests for ice candidate sending ([\matrix-org#2674](matrix-org#2674)).
* Prevent exception when muting ([\matrix-org#2667](matrix-org#2667)). Fixes element-hq/element-call#578.
* Fix race in creating calls ([\matrix-org#2662](matrix-org#2662)).
* Add client.waitUntilRoomReadyForGroupCalls() ([\matrix-org#2641](matrix-org#2641)).
* Wait for client to start syncing before making group calls ([\matrix-org#2632](matrix-org#2632)). Fixes matrix-org#2589.
* Add GroupCallEventHandlerEvent.Room ([\matrix-org#2631](matrix-org#2631)).
* Add missing events from reemitter to GroupCall ([\matrix-org#2527](matrix-org#2527)). Contributed by @toger5.
* Prevent double mute status changed events ([\matrix-org#2502](matrix-org#2502)).
* Don't mute the remote side immediately in PTT calls ([\matrix-org#2487](matrix-org#2487)). Fixes element-hq/element-call#425.
* Fix some MatrixCall leaks and use a shared AudioContext ([\matrix-org#2484](matrix-org#2484)). Fixes element-hq/element-call#412.
* Don't block muting on determining whether the device exists ([\matrix-org#2461](matrix-org#2461)).
* Only clone streams on Safari ([\matrix-org#2450](matrix-org#2450)). Fixes element-hq/element-call#267.
* Set PTT mode on call correctly ([\matrix-org#2445](matrix-org#2445)). Fixes element-hq/element-call#382.
* Wait for mute event to send in PTT mode ([\matrix-org#2401](matrix-org#2401)).
* Handle other members having no e2e keys ([\matrix-org#2383](matrix-org#2383)). Fixes element-hq/element-call#338.
* Fix races when muting/unmuting ([\matrix-org#2370](matrix-org#2370)).
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