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Re: [Uta] UTA: Server certificate management (Re: Last Call: <draft-ietf-uta-email-tls-certs-05.txt>)

Alexey Melnikov <alexey.melnikov@isode.com> Wed, 02 December 2015 14:48 UTC

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Date: Wed, 02 Dec 2015 14:47:42 +0000
From: Alexey Melnikov <alexey.melnikov@isode.com>
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To: John R Levine <johnl@taugh.com>
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Subject: Re: [Uta] UTA: Server certificate management (Re: Last Call: <draft-ietf-uta-email-tls-certs-05.txt>)
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Hi John,

On 02/12/2015 13:42, John R Levine wrote:
>> But it has to be signed by a CA. If the CA is not happy for you to 
>> assert SRV-ID, it should not include SRV-ID in an issued certificate.
>
> Now I'm really confused.  Are you saying the SRV-ID is optional?
I am saying that CAs can't sign what they can't validate. This is 
nothing new, the same applies to DNS-ID or CN-ID. So if a CA wants to 
sign SRV-ID, it needs a way to validate it.

> If so, what's the point of it?  In nearly all cases, there's no way 
> for a CA to tell what SRV-IDs it should allow, so nobody will use them.
Some enterprise CAs or CAs which are also MSPs might be able to validate 
SRV-IDs. Also when SRV record points to a subdomain of the right hand 
side, CA might treat this as allowed without validation.

> (This is in addition to the problems that a large mail host handles 
> tens of thousands of domains, and the list changes every day.)
>
> Regards,
> John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
> Please consider the environment before reading this e-mail.

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