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Re: [Acme] Want client-defined callback port

Bruce Gaya <gaya@apple.com> Thu, 23 April 2015 17:12 UTC

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From: Bruce Gaya <gaya@apple.com>
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Date: Thu, 23 Apr 2015 10:12:22 -0700
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To: Richard Barnes <rlb@ipv.sx>
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Cc: "Salz, Rich" <rsalz@akamai.com>, Peter Eckersley <pde@eff.org>, Martin Thomson <martin.thomson@gmail.com>, "acme@ietf.org" <acme@ietf.org>, Nico Williams <nico@cryptonector.com>
Subject: Re: [Acme] Want client-defined callback port
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> On 23 Apr 2015, at 06:18, Richard Barnes <rlb@ipv.sx> wrote:
> 
> 
> 
> On Thu, Apr 23, 2015 at 12:09 AM, Martin Thomson <martin.thomson@gmail.com <mailto:martin.thomson@gmail.com>> wrote:
> On 22 April 2015 at 19:33, Peter Eckersley <pde@eff.org <mailto:pde@eff.org>> wrote:
> > Perhaps those policies can be stored out of band, or perhaps we can add
> > a separate REST API endpoint where clients ask what ports the server
> > considers acceptable for DV Challenges.
> 
> 
> Or just pick port 100 (or another that isn't already taken) and say
> 443 or _that_.  I can't imagine you would need to have many numbers
> before you found one that was free.
> 
> This seems like a simpler and safer option to me.  Register an ACME port and use that if HTTPS isn't feasible.
> 
> Bruce, would that meet your use case?  That is, in your scenario, can the CalDAV service open a new (privileged) port, or does the ACME verification have to happen on the CalDAV port?
> 

Any port that is currently unused on the client is fine with me.  (CalDAV was just as example.)

Bruce

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