NTS, Big picture
hmurray at megapathdsl.net
Fri Jun 1 18:38:24 UTC 2018
devel at ntpsec.org said:
> This is just off the top of my head, but I wonder if this is ultimately
> going to need an SSH-style "leap of faith" trust model. For example, the
> first time NTP starts up, it would ignore the NotBefore and NotAfter
> attributes, but validate everything else in the certificate as normal.
I've been assuming that we would be using a library to handle the certificate
processing, so that logic may need an API change.
> Another option would be to simply check the system clock for sanity (e.g.
> using the ntpd compilation date). If it's insane, do not check certificate
> expirations. Otherwise, always do. If the system clock is way off, the admin
> can manually set the clock within reason.
One of the nasty cases for ntp is a spare module that sits on a shelf for
10-20 years. If you have an embedded application, the admin may be back at
This also comes up when trying to fixup GPS dates that have overflowed the 10
bit week counter.
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