Re: A permission to re-sign header

On Fri, Apr 18, 2014 at 8:44 AM, John R Levine <[email protected]> wrote:

>
>> Could the same thing be accomplished by a slight adjustment to VBR,
>> allowing a zone to vouch for another with the specific meaning that this
>> means X is authorized to generate mail for Y as long as X signs it?
>>
>
> VBR is just a hint saying go look at a whitelist.  It has no inherent
> security and only works because it assumes the receiver already knows what
> whitelists it trusts.  (This must be obscure, too many people told us VBR
> was stupid because anyone could build a fake whitelist and point VBR
> headers at it.)


> Do you mean that every DMARC publisher would have its own exception
> whitelist, and the adjustment would be to assume the whitelist is credible
> if its name matches the From: domain?  I suppose that could work, although
> expecting every domain to publish its own whitelist seems unlikely to
> scale.  A domain could indirectly use someone else's domain whitelist via
> DNAME, but urrghh.
>
> If we expect there to be a handful of widely used DMARC exception
> whitelists, a mailing list could certainly use VBR as defined to point at
> the whitelist(s) in which its signing domain is included.
>

Right, maybe that's what I had in mind.  It seems as though you're
essentially suggesting we need a way to confirm a relationship between X
and Y, and VBR pretty much does that.

Also, it is both the "go look at the whitelist" hint and the specification
of how the whitelist is published.

-MSK

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