[Ntp] Antw: [EXT] Re: Getting started using NTS ‑‑ clock accuracy vs certificates
Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de> Tue, 02 August 2022 06:35 UTC
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Date: Tue, 02 Aug 2022 08:34:56 +0200
From: Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>
To: mlichvar@redhat.com, halmurray@sonic.net
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Subject: [Ntp] Antw: [EXT] Re: Getting started using NTS ‑‑ clock accuracy vs certificates
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>>> Hal Murray <halmurray@sonic.net> schrieb am 01.08.2022 um 23:06 in Nachricht <20220801210637.D395628C1CA@107-137-68-211.lightspeed.sntcca.sbcglobal.net>: > mlichvar@redhat.com said: >> For clients without RTC/battery the server can have a special name using a >> self‑signed certificate with validity extending to distant past and future. >> The name and the certificate can be baked in the OS image and updated by the >> OS‑specific update mechanism as necessary. > > Thanks. > > I'd thought of self signed certificates for what I call the 10 year problem. > > If you have a spare that sits on the shelf for 10 years or more, how do you > get it started? Phone companies used to work that way. I'm not sure what > their current spare lifetimes are. > > I was picturing that the phone company would run their own server using a > self > signed certificate. They would be in a position both to understand how > important it is to protect the private key and to run the server for 10 > years. > > With your suggestion, I think it's reasonable for a server to have 2 > certificates and use the right one depending on the host name presented > early > in the handshake. > > > Note that there is a similar problem with DNSSEC. I think we can solve that > > one by caching the DNS info in /etc/hosts (or similar). > > Using the numerical IP address as the "host name" in the certificate would > avoid the DNSSEC tangle. That seems like a reasonable convention for long > lived certificates. If you know ahead of time which IP address the device will get. I doubt that for a typical spare part that should work without being configured before. > > >> It would be nice if the widely known NTS servers had this. > > Is there a list of public NTS servers? > > We only need a few NTS servers with long lived certificates so non‑RTC > systems > can get off the ground. After that, they can switch to closer servers. > > > > > ‑‑ > These are my opinions. I hate spam. > > > > _______________________________________________ > ntp mailing list > ntp@ietf.org > https://www.ietf.org/mailman/listinfo/ntp
- [Ntp] Antw: [EXT] Re: Getting started using NTS ‑… Ulrich Windl
- Re: [Ntp] Antw: [EXT] Re: Getting started using N… Hal Murray
- Re: [Ntp] Antw: [EXT] Re: Getting started using N… Ulrich Windl
- Re: [Ntp] Antw: [EXT] Re: Getting started using N… Danny Mayer