[cabfpub] FW: [websec] #58: Should we pin only SPKI, or also names

Jeremy Rowley jeremy.rowley at digicert.com
Mon Aug 12 19:54:44 UTC 2013

See below.  Is this a project of interest to the CA/Browser forum?  The
Forum would be responsible for maintaining a registry of CAs and the mapping
to their roots for the purpose of key pinning.


-----Original Message-----
From: websec-bounces at ietf.org [mailto:websec-bounces at ietf.org] On Behalf Of
Yoav Nir
Sent: Monday, August 12, 2013 12:50 PM
To: Trevor Perrin
Cc: websec
Subject: Re: [websec] #58: Should we pin only SPKI, or also names

On Aug 12, 2013, at 7:11 PM, Trevor Perrin <trevp at trevp.net> wrote:

> On Mon, Aug 12, 2013 at 1:17 AM, Gervase Markham <gerv at mozilla.org> wrote:
>> On 11/08/13 05:25, Trevor Perrin wrote:
>>> Could we just say:
>>> - The holder of a domain name is responsible for specifying the 
>>> SPKIs that it maps to.
>>> - How the domain holder communicates this to the UA is out of scope.
>> In other words "Don't set up a registry; just punt the problem and 
>> hope something works itself out organically"?
> Yes.
> If people hate this, someone should make a proposal for a registry:
> - Who maintains it?
> - How are requests to add or remove CA names authenticated?
> - Does the registry map CA names to actual keys?
>   - If so, how are change requests authenticated?
>   - What are the timing rules to ensure changes are propagated to 
> browsers as needed?
> - How can the registry be monitored and double-checked to avoid it 
> becoming a single point of failure?
> - Should these process details be defined in the HPKP spec or somewhere

As you've said, before this is for the CAs and browsers to come up with such
a solution (assuming they want it, and I'm not hearing this from either the
Mozilla people or the Google people on this list). CAs and browers. Now, if
only there was some forum where both of these come together...

Joking aside, The CA/Browser forum is not currently in the business of
running registries. IANA is, but I don't know how to specify in a draft an
IANA policy that would include following mergers, acquisitions, and
branding, and settling trademark disputes. Not do I have any reason to
believe that IANA would be willing to do this. So unless the CA/Browser
Forum agrees to take on this responsibility, and provide stable link for
both machine and human readable mappings, I think this proposal should be
shelved until we can find someone who will answer your questions above.


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