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Re: [certid] What DNS-ID if also using a DNS-SRV?

Alexey Melnikov <alexey.melnikov@isode.com> Sat, 19 June 2010 11:36 UTC

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Date: Sat, 19 Jun 2010 12:36:01 +0100
From: Alexey Melnikov <alexey.melnikov@isode.com>
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To: Paul Hoffman <paul.hoffman@vpnc.org>
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Cc: certid@ietf.org
Subject: Re: [certid] What DNS-ID if also using a DNS-SRV?
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Hi Paul,

Paul Hoffman wrote:

>   1.  The certificate MUST include a "DNS-ID" (i.e., a subjectAltName
>       identifier of type dNSName).
>
>   2.  If the service using the certificate deploys a technology in
>       which a server is discovered by means of DNS SRV records
>       [DNS-SRV] (e.g., this is true of [XMPP]), then the certificate
>       SHOULD include an "SRV-ID" (i.e., an instance of the SRVName form
>       of otherName from the GeneralName structure in the subjectAltName
>       as specified in [SRVNAME]).
>
>If 2 is true, what is the value of the required DNS-ID?
>
One or more hostname for machines that would provide the specified 
service. I.e. most likely some/all hostnames from the output of DNS SRV 
lookup, but I can think of some examples where other hostnames can be 
used in addition to or instead of these. E.g. a machine on internal 
network, hostname of a NAT box, etc.

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