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Re: [Ntp] Last Call: <draft-ietf-ntp-yang-data-model-10.txt> (A YANG Data Model for NTP) to Proposed Standardsecurity

Miroslav Lichvar <mlichvar@redhat.com> Tue, 09 February 2021 10:30 UTC

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Date: Tue, 09 Feb 2021 11:29:48 +0100
From: Miroslav Lichvar <mlichvar@redhat.com>
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Subject: Re: [Ntp] Last Call: <draft-ietf-ntp-yang-data-model-10.txt> (A YANG Data Model for NTP) to Proposed Standardsecurity
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On Tue, Feb 09, 2021 at 01:34:46AM -0800, Hal Murray wrote:
> Existing NTP code also supports SHA-1
> 
> RFC 8573 that deprecated using MD5 with NTP suggests using AES-CMAC.  Note 
> that is CMAC rather than HMAC and that NTP uses it's own scheme rather than 
> HMAC as described in RFC 6151.
> 
> The NTPsec code supports any hash (or CMAC) algorithm that the underlying 
> library from OpenSSL supports.

There is also NTS. The model doesn't seem to have an option to enable
that.

This brings a question how can be the YANG model extended with new,
possibly implementation-specific, options, or new values for some
options. For example, the model says minpoll and maxpoll have a range
of 4..17, but no implementation that I know follows that.

-- 
Miroslav Lichvar

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