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Re: [Anima] [lamps] Long-lived certificates, but frequently renewed certificates

Nico Williams <nico@cryptonector.com> Tue, 23 March 2021 23:44 UTC

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Date: Tue, 23 Mar 2021 18:44:01 -0500
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From: Nico Williams <nico@cryptonector.com>
To: Michael Richardson <mcr+ietf@sandelman.ca>
Cc: Eliot Lear <lear@cisco.com>, Toerless Eckert <tte@cs.fau.de>, LAMPS <spasm@ietf.org>, anima@ietf.org
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Subject: Re: [Anima] [lamps] Long-lived certificates, but frequently renewed certificates
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On Tue, Mar 23, 2021 at 11:49:23AM -0400, Michael Richardson wrote:
> Yes, that's exactly what I'm after.
> We can, as you suggest, do this as an HTTP header in EST.
> It could also go into some new certificate extension, although it's rather
> more meta data, and it isn't clear it should get shared with peers.

Hmmm, but maybe it is worth sharing with the peers if they could alert
about a device with a yet valid cert that way out of renewal policy.

That could be an extension saying "holder is expected to renew every
$fraction of (notAfter - notBefore)".

Not that RPs should log _every_ time they see a peer with a certificate
that's out of renewal policy, but that it could be useful to warn when
doing so doesn't risk filling logs with useless information.

In a hospital, for example, devices could have a warning light for when
they need maintenance or when their peers need maintenance.

Nico
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