Re: [apps-discuss] draft-kucherawy-rfc5451bis

Alessandro Vesely <vesely@tana.it> Sun, 17 March 2013 09:18 UTC

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Date: Sun, 17 Mar 2013 10:18:17 +0100
From: Alessandro Vesely <vesely@tana.it>
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Subject: Re: [apps-discuss] draft-kucherawy-rfc5451bis
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On Sat 16/Mar/2013 19:43:37 +0100 Dave Cridland wrote:
> On 16 Mar 2013 08:59, "Alessandro Vesely" <vesely@tana.it> wrote:
>>
>> Oops, I overlooked that "[ CFWS version ]" in authres-header.  Thus
>> you helped me catch a bug.  Thanks!
>>
> 
> That was even the one that was properly specified... it's the other
> one I'm more concerned with.

"Properly" might be something of an overstatement.  Section 2.3 says:

 For tracing and debugging purposes, the authentication identifier MAY
 instead be the hostname of the MTA performing the authentication
 check whose result is being reported.  This is also useful for
 another purpose, as described in Section 4.  Moreover, some
 implementations have considered appending a delimiter such as "/" and
 following it with useful transport tracing data such as the [SMTP]
 queue ID or a timestamp.

Informal discussions like that tend to be ambiguous because "/" is
allowed in dot-atom.  Hence one doesn't know whether the text means
something like:

  server.example.com/Q304b5 / 1

or:

  server.example.com / 197813