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Re: [Ntp] Finding leap-seconds.list

Harlan Stenn <stenn@nwtime.org> Thu, 08 November 2018 09:24 UTC

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From: Harlan Stenn <stenn@nwtime.org>
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Date: Thu, 08 Nov 2018 01:24:44 -0800
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Subject: Re: [Ntp] Finding leap-seconds.list
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By default, the "update-leap" script in the Reference Implementation
queries:

   https://www.ietf.org/timezones/data/leap-seconds.list

H

On 11/8/18 12:51 AM, Martin Burnicki wrote:
> Warner Losh wrote:
>> So what's the new place to get it if the IEFT stops hosting it? All the
>> 'much better places' don't earlier in the thread do not resolve for me
>> at all (or resolved to web pages that aren't suitable for automatic
>> downloading). The ntp leapsecond file has a format that's been fixed for
>> at least two decades. So what's the real 'next step' for people that
>> download it outside of the TZ stuff?
>>
>> This is a very disruptive change to the FreeBSD community, at least.
>> It's not clear what it accomplishes.
> 
> Why not use the leap second file directly from the IERS?
> 
> The IERS is the authoritative source that decides if a leap second will
> be inserted, or not, and it publishes this information twice a year in
> its Bulletin C.
> 
> Some years ago I contacted the IERS folks and asked them if they
> couldn't also provide a leap second file in NTP/NIST format, and they
> started to do this. Yet the updated file was always available
> immediately when a Bulletin C was published.
> https://hpiers.obspm.fr/iers/bul/bulc/ntp/ (directory listing)
> https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list (file)
> 
> Right from the beginning the IERS leap second file was even available
> via https, while e.g. from NIST it used to be available via ftp only (I
> don't know if currently it's also available via https).
> 
> Actually there are discussions on security stuff like NTS to prevent
> systems from accepting spoofed time, and IMO it's a no-go to provide
> time servers with a leap second file that is retrieved via FTP.
> 
> And yes, I agree that the SHA1 signature in the leap second file can
> *only* be used to check the integrity of the file. That signature can
> not be used to check if the file has provided by an authentic source
> like IERS, NIST, or USNO.
> 
> 
> Martin
> 

-- 
Harlan Stenn <stenn@nwtime.org>
http://networktimefoundation.org - be a member!

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