element-hq / element-hq/synapse

We shouldn't let people DoS us via /sync (SYN-660)

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A-Sync T-Defect
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Description

This issue has been migrated from [#1239](https://github.com/matrix-org/synapse/issues/1239).

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Submitted by @​matthew:matrix.org
If people are hammering us too rapidly on /sync without a timeout or with too small a timeout, presumably we should insert an implicit timeout to slow them down. c.f. the current DoS from 93.92.200.183

(Imported from https://matrix.org/jira/browse/SYN-660)

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