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17 lines
853 B
Markdown
17 lines
853 B
Markdown
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When validating event signatures, servers MUST enforce the
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`valid_until_ts` property from a key request is at least as large as the
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`origin_server_ts` for the event being validated. Servers missing a copy
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of the signing key MUST try to obtain one via the [GET
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/\_matrix/key/v2/server](/server-server-api#get_matrixkeyv2serverkeyid)
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or [POST
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/\_matrix/key/v2/query](/server-server-api#post_matrixkeyv2query)
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APIs. When using the `/query` endpoint, servers MUST set the
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`minimum_valid_until_ts` property to prompt the notary server to attempt
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to refresh the key if appropriate.
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Servers MUST use the lesser of `valid_until_ts` and 7 days into the
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future when determining if a key is valid. This is to avoid a situation
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where an attacker publishes a key which is valid for a significant
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amount of time without a way for the homeserver owner to revoke it.
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