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Patch to temporarily drop cross-user m.key_share_requests#8675
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anoadragon453 merged 8 commits intomatrix-org-hotfixesfrom Oct 28, 2020
Merged
Patch to temporarily drop cross-user m.key_share_requests#8675anoadragon453 merged 8 commits intomatrix-org-hotfixesfrom
anoadragon453 merged 8 commits intomatrix-org-hotfixesfrom
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erikjohnston
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Cross-user `m.key_share_requests` are a relatively new `to_device` message that allows user to re-request session keys for a message from another user if they were otherwise unable to retrieve them. Unfortunately, these have had performance concerns on matrix.org. This is a temporary patch to disable them while we investigate a better solution.
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)" This reverts commit d60af93.
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)" (#9668) We patched `matrix-org-hotfixes` a little while ago in #8675 to drop any cross-user key share requests while they were being accidentally spammed by a client. This was a temporary fix until we had some rate-limiting in place. Rate-limiting landed in #8957. Note that the rate-limit can't be configured, but has what appear to be [sensible defaults](https://github.com/matrix-org/synapse/blob/db2efa9c50569adbfab102b1f447f5a8312b95f3/synapse/config/ratelimiting.py#L105-L113). Note that the original patch was already actually overridden partially when the rate-limit PR landed, as they conflicted. So we've already lifted the restriction between local devices on matrix.org, but requests were still blocked from being sent over federation. This PR cleans up the remaining bits. This reverts commit d60af93.
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Cross-user
m.key_share_requestsare a relatively newto_devicemessage that allows user to re-request session keys for a message from another user if they were otherwise unable to retrieve them.Unfortunately, these have had performance concerns on matrix.org. This is a temporary patch to disable them while we investigate a better solution.