Re: [Acme] orders, authorizations, and identifiers (oh my)

I get that; what I’m looking to confirm--and I’m reasonably sure is the case--is that, given a failed order, it’s up to server policy to spell out whether a client may reasonably suppose that a 2nd order against a subset of the identifiers from the 1st order would pass all of the 2nd set of authzs.

For LE, for example, a client can simply look at the ids of the failed authzs and omit those ids from the 2nd order.

Going back to the hypothetical Fred/Jane/Pat CA, though, for a client to know how to submit that 2nd order there would need to be some policy external to ACME that would indicate the feasibility of such a thing.

Does that sound right?

-F

> On Jul 16, 2019, at 10:24 AM, Daniel McCarney <cpu@letsencrypt.org> wrote:
> 
> So if we tell the human operator, “Jane & Pat gave the OK, but Fred said not”, then it’s left to server policy to determine whether that means a hypothetical order with just one or the other domain would pass all authzs?
> 
> No, if the server returned three authorizations all three must be status=valid for the order to be ready for issuance. Earlier drafts had a notion of challenge combinations that would allow something sort of similar but it was dropped.
> 
> Per 7.1.6:
> 
> Order objects are created in the "pending" state. Once all of the authorizations listed in the order object are in the "valid" state, the order transitions to the "ready" state.
> 
> The server policy is exercised by the choice of authorizations/challenges in the pending order, not by the client deciding which authorizations in an order to satisfy.
> 
> On Tue, Jul 16, 2019 at 10:11 AM Felipe Gasper <felipe@felipegasper.com> wrote:
> 
> > On Jul 16, 2019, at 9:28 AM, Daniel McCarney <cpu@letsencrypt.org> wrote:
> > 
> > So it would be reasonable for this order to contain a single authz … and would that authz’s identifier be just “example.com”, then? Thus that authz object would not reference “www”, even though it is that domain’s corresponding authz object? Or would a client be accountable for implementing a “best-match authz” lookup to determine which authz corresponds to a given domain?
> > 
> > Yes, I would expect the order's one authorization to have the identifier "example.com".
> > 
> > I believe the confusion here is when you say "even though it is that domain's corresponding authz object" and "Since the order requires successful authz for both domains".
> > 
> > For the first part, as I understand there is no guaranteed correspondence between any of the identifiers in the order request and the identifiers in the returned authorizations. That's what the sentence you quoted on p26 is meant to convey. The client shouldn't attempt to match authz's to requested identifiers at all, it should just look at the identifiers in the authorizations returned by the server and prove control of those identifiers with the challenges available.
> 
> Thank your for your response. I think I see what’s going on.
> 
> To flesh out a hypothetical a bit more:
> 
> order identifiers: example.com, www.example.com
> 
> authzs:
>   0)
>     - identifier: { type: person, value: Fred }
>     - challenge: ask if it’s ok
>   1)
>     - identifier: { type: person, value: Jane }
>     - challenge: ask if it’s ok
>   2)
>     - identifier: { type: person, value: Pat }
>     - challenge: ask if it’s ok
> 
> So if we tell the human operator, “Jane & Pat gave the OK, but Fred said not”, then it’s left to server policy to determine whether that means a hypothetical order with just one or the other domain would pass all authzs?
> 
> -F
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