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Fix verification bug with pendingEventOrdering: "chronological" #3382

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merged 1 commit into from
May 18, 2023

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@richvdh richvdh commented May 18, 2023

There exists a bug (in the legacy Crypto implementation), in which in-room verifications-via-emoji will fail for applications which use the default pendingEventOrdering setting.

The basis of the problem is that the verifier sees a local echo of our own outgoing m.key.verification.mac. It tries to verify the MAC in that message, which of course fails.

The solution is to treat such local echoes in the same way as remote echoes.


Here's what your changelog entry will look like:

馃悰 Bug Fixes

  • Fix verification bug with pendingEventOrdering: "chronological" (#3382).

If we don't do this, then we end up trying to match the MAC on our own
`m.key.verification.mac`, which of course fails.
@richvdh richvdh added the T-Defect Bugs, crashes, hangs, vulnerabilities, or other reported problems label May 18, 2023
@richvdh richvdh marked this pull request as ready for review May 18, 2023 12:49
@richvdh richvdh requested a review from a team as a code owner May 18, 2023 12:49
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richvdh commented May 18, 2023

In an ideal world, I'd add an explicit test for this, but it's a bit of an obscure bug in the legacy Crypto implementation, and setting up a test to exercise it will be a non-trivial amount of work.

I do have a minor change to react-sdk's cypress tests which rely on it, so that will have to do.

richvdh added a commit to matrix-org/matrix-react-sdk that referenced this pull request May 18, 2023
This `done` call completes the verification process and stops it responding
with further messages. It is unnecessary, *provided* the verification completes
successfully, for which see
matrix-org/matrix-js-sdk#3382.
@richvdh richvdh added this pull request to the merge queue May 18, 2023
Merged via the queue into develop with commit b7b1129 May 18, 2023
27 of 28 checks passed
@richvdh richvdh deleted the rav/fix/verification_with_chronological branch May 18, 2023 13:58
github-merge-queue bot pushed a commit to matrix-org/matrix-react-sdk that referenced this pull request May 18, 2023
* Remove redundant `verifier.done()` call

This `done` call completes the verification process and stops it responding
with further messages. It is unnecessary, *provided* the verification completes
successfully, for which see
matrix-org/matrix-js-sdk#3382.

* Remove duplicated code in `decryption-failure` test

* remove unused imports
su-ex added a commit to SchildiChat/matrix-js-sdk that referenced this pull request Dec 13, 2023
* Ensure we do not add relations to the wrong timeline ([\matrix-org#3427](matrix-org#3427)). Fixes element-hq/element-web#25450 and element-hq/element-web#25494.
* Deprecate `QrCodeEvent`, `SasEvent` and `VerificationEvent` ([\matrix-org#3386](matrix-org#3386)).
* Move crypto classes into a separate namespace ([\matrix-org#3385](matrix-org#3385)).
* Mention deno support in the README ([\matrix-org#3417](matrix-org#3417)). Contributed by @sigmaSd.
* Mark room version 10 as safe ([\matrix-org#3425](matrix-org#3425)).
* Prioritise entirely supported flows for UIA ([\matrix-org#3402](matrix-org#3402)).
* Add methods to terminate idb worker ([\matrix-org#3362](matrix-org#3362)).
* Total summary count ([\matrix-org#3351](matrix-org#3351)). Contributed by @toger5.
* Audio concealment ([\matrix-org#3349](matrix-org#3349)). Contributed by @toger5.
* Correctly accumulate sync summaries. ([\matrix-org#3366](matrix-org#3366)). Fixes element-hq/element-web#23345.
* Keep measuring a call feed's volume after a stream replacement ([\matrix-org#3361](matrix-org#3361)). Fixes element-hq/element-call#1051.
* Element-R: Avoid uploading a new fallback key at every `/sync` ([\matrix-org#3338](matrix-org#3338)). Fixes element-hq/element-web#25215.
* Accumulate receipts for the main thread and unthreaded separately ([\matrix-org#3339](matrix-org#3339)). Fixes element-hq/element-web#24629.
* Remove spec non-compliant extended glob format ([\matrix-org#3423](matrix-org#3423)). Fixes element-hq/element-web#25474.
* Fix bug where original event was inserted into timeline instead of the edit event ([\matrix-org#3398](matrix-org#3398)). Contributed by @andybalaam.
* Only add a local receipt if it's after an existing receipt ([\matrix-org#3399](matrix-org#3399)). Contributed by @andybalaam.
* Attempt a potential workaround for stuck notifs ([\matrix-org#3384](matrix-org#3384)). Fixes element-hq/element-web#25406. Contributed by @andybalaam.
* Fix verification bug with `pendingEventOrdering: "chronological"` ([\matrix-org#3382](matrix-org#3382)).
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