Re: [Acme] FW: [EXTERNAL] New Version Notification for draft-vanbrouwershaven-acme-auto-discovery-00.txt

[Tim Hollebeek <[e-mail]>]

If priority is defined as a positive integer (which makes sense to me), then zero is an error, yes.

If it’s desirable to have a “no priority” value, then zero might be a reasonable choice for such a value.  But it’s hard to reason about whether “no priority” is higher or lower than items that do have priorities, so I think “no priority” adds additional complexity that should not be added unnecessarily.  I think it’s simpler to stick to a single, ordered list of priority numbers, and ordinal numbers (a.k.a positive integers) are the best way to express that.

-Tim

From: Paul van Brouwershaven <Paul.vanBrouwershaven=[e-mail]>
Sent: Wednesday, July 12, 2023 1:01 PM
To: Tim Hollebeek <[e-mail]>; Q Misell <[e-mail]>
Cc: [e-mail]
Subject: Re: [Acme] FW: [EXTERNAL] New Version Notification for draft-vanbrouwershaven-acme-auto-discovery-00.txt

> Anyone who argues that zero is a positive integer should be referred to the standard math textbook of positive.  Zero is a non-negative integer, but I’m not aware of any definition of “positive” that makes it a positive integer.

Do you argue that "0" should be threatened as an error instead of equal to no priority?

________________________________
From: Tim Hollebeek <tim.hollebeek=[e-mail]<mailto:tim.hollebeek=[e-mail]>>
Sent: Wednesday, July 12, 2023 6:43:21 PM
To: Paul van Brouwershaven <[e-mail]<mailto:[e-mail]>>; Q Misell <[e-mail]<mailto:[e-mail]>>
Cc: [e-mail]<mailto:[e-mail]> <[e-mail]<mailto:[e-mail]>>
Subject: RE: [Acme] FW: [EXTERNAL] New Version Notification for draft-vanbrouwershaven-acme-auto-discovery-00.txt


Anyone who argues that zero is a positive integer should be referred to the standard math textbook of positive.  Zero is a non-negative integer, but I’m not aware of any definition of “positive” that makes it a positive integer.



Also, ignoring failures in CAA records is probably not the right answer.  CAA should fail closed, not open.



-Tim



From: Acme <[e-mail]<mailto:[e-mail]>> On Behalf Of Paul van Brouwershaven
Sent: Wednesday, July 12, 2023 9:52 AM
To: Q Misell <[e-mail]<mailto:[e-mail]>>
Cc: [e-mail]<mailto:[e-mail]>
Subject: Re: [Acme] FW: [EXTERNAL] New Version Notification for draft-vanbrouwershaven-acme-auto-discovery-00.txt



Hi Q,



Thanks, this is great and really helpful!

Is priority=0 an error coditition, some might argue 0 is a positive integer?

Any suggestion? maybe we should simply start counting at 0 instead of 1

What about discovery=foobar?

"foobar" is not a Boolean, the text is clear that this parameter MUST be a Boolean, so this should invalidate the parameter.

Should the client ignore invalid issue records and process the rest, or fail outright?

We should ignore the failure of a single CAA record and continue with the next, similar to when the client encounters ACME errors.



I will clarify this with the following change:



The ACME client analyzes the CAA records - > The ACME client analyzes the valid CAA records



It looks like you implemented discovery as a pre-condition while 3.1.1 specifies:



When this parameter is not specified the client MUST assume that discovery is enabled.



There is however a comment in the examples that this behavior might need to change if deemed necessary.



Paul





________________________________

From: Q Misell <[e-mail]<mailto:[e-mail]>>
Sent: Wednesday, July 12, 2023 15:06
To: Paul van Brouwershaven <[e-mail]<mailto:[e-mail]>>
Cc: [e-mail]<mailto:[e-mail]> <[e-mail]<mailto:[e-mail]>>
Subject: Re: [Acme] FW: [EXTERNAL] New Version Notification for draft-vanbrouwershaven-acme-auto-discovery-00.txt



Hi all,



I happened to be poking around the certbot codebase today and decided to try and implement this draft.

It turned out to be a much simpler task than I had expected, however I felt the draft was a bit lacking in details for what the ACME client should consider an error.



For example:

  *   Is priority=0 an error coditition, some might argue 0 is a positive integer?
  *   What about discovery=foobar?
  *   Should the client ignore invalid issue records and process the rest, or fail outright?

My fork of certbot with the implementation is available at https://github.com/as207960/certbot/tree/auto-discovery<https://urldefense.com/v3/__https:/github.com/as207960/certbot/tree/auto-discovery__;!!FJ-Y8qCqXTj2!cZZsOZ0v5-kwi0u2XFbPWT2ddKQUeoKDOKjmTA0uStA0dZuwoAFoA5bphSBDyICkcF08SK8ddsv-a3_g84d3UvJ3$>.



Thanks,

Q

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On Fri, 7 Jul 2023 at 14:32, Salz, Rich <rsalz=[e-mail]<mailto:[e-mail]>> wrote:



  *   how about ratelimit? for large hosting they will hit CA's default API ratelimit fast



The HTTPAPI working group is working on standard HTTP headers for specifying rate limits.  See

                https://datatracker.ietf.org/doc/draft-ietf-httpapi-ratelimit-headers/<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-ietf-httpapi-ratelimit-headers/__;!!FJ-Y8qCqXTj2!cZZsOZ0v5-kwi0u2XFbPWT2ddKQUeoKDOKjmTA0uStA0dZuwoAFoA5bphSBDyICkcF08SK8ddsv-a3_g81_OWtQS$>

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