On Mar 20, 2008, at 11:05 PM, Dean Willis wrote:

>
>
> Let me restate this with fewer typos:
>
> I think what Cullen is saying is:
>
> If the certificate presented for a SIP domain contains Extended Key
> Usage values [RFC 3280] , implementations MAY validate those
> values using the techniques described in I-D.sip-eku[9].
>
> and if that's what he's saying, I think this is in conflict with the  
> text of RFC 3280, which makes validation a MUST.
>
> --
> Dean
>
>

This is not at all what I was saying. I was saying that the EKU work  
is an orthogonal extensions to SIP with very little to do with the  
text in the domain-certs document and there is no need for this work  
to mandate support for sip-eku. I have not heard a technical argument  
why some part of the doamin-certs draft is not implementable without  
implementing sip-eku. I have heard people say, "sip-eku is a good  
idea" which is fine and assuming it becomes an RFC, devices that want  
to implement will implement that RFC.  There are also lots of other  
drafts that are good ideas and we wish people would do them, however,  
we don't add as a note to the end over every draft that says "You MUST  
also implement draft x, y, and z even though they have little to do  
with this one".

In my mind, the point of domain-certs is largely about to clarify how  
certain parts of 3261 related to certificates for TLS. People had  
implemented and were doing more or less all the major parts of domain- 
certs over 5 years ago - long before folks started even thinking about  
sip-eku. I think sip-eku is a fine document and should become an RFC.  
I also think there is a need for a document with roughly the advice in  
domain-certs. However, I see no reason that domain-certs, something  
people have been doing for several years, has to mandate  
implementation of sip-eku. These are very separable issues and should  
be kept that way.

Cullen <with my individual contributor hat on>


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