π blog!
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@Edent activitypub.bot gives a tolerance of 5 minutes.
https://github.com/evanp/activitypub-bot/blob/main/lib%2Fhttpsignatureauthenticator.js#L8
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Hey, #Mastodon and #ActivityPub developers.
How much skew do you allow before rejecting a message?
I've just received something where the header is signed:
Mon, 31 Aug 2026 20:09:54 GMTBut the ActivityPub message was published:
Mon, 31 Aug 2026 19:58:36 GMTThat's a little over 10 minutes. Is that too much? Should I not care as long as the signature validates?
@Edent I've seen my Sidekiq queues get multiple minutes long on occasion, so it doesn't seem unreasonable.
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@evan Thanks - I had mine at two minutes.
I'm starting to see more exceeding 10 minutes.
I wonder what the actual risk is of accepting something with that long a delay?@Edent replay attacks, I'd guess.
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