[lamps] [Editorial Errata Reported] RFC8659 (7139)

RFC Errata System <rfc-editor@rfc-editor.org> Fri, 23 September 2022 19:46 UTC

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Subject: [lamps] [Editorial Errata Reported] RFC8659 (7139)
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The following errata report has been submitted for RFC8659,
"DNS Certification Authority Authorization (CAA) Resource Record".

--------------------------------------
You may review the report below and at:
https://www.rfc-editor.org/errata/eid7139

--------------------------------------
Type: Editorial
Reported by: Brian Dickson <brian.peter.dickson@gmail.com>

Section: 4.2

Original Text
-------------
   parameters = (parameter *WSP ";" *WSP parameters) / parameter
   parameter = tag *WSP "=" *WSP value
   tag = (ALPHA / DIGIT) *( *("-") (ALPHA / DIGIT))
   value = *(%x21-3A / %x3C-7E)

Corrected Text
--------------
   parameters = (parameter *WSP ";" *WSP parameters) / parameter
   parameter = parameter-tag *WSP "=" *WSP parameter-value
   parameter-tag = (ALPHA / DIGIT) *( *("-") (ALPHA / DIGIT))
   parameter-value = *(%x21-3A / %x3C-7E)

Notes
-----
1. Original text uses "tag" and "value" in the ABNF is ambiguous or conflicting with the usage of "tag" and "value" in terms "Property Tag" and "Property Value" (which are in the main CAA context).

2. The text for "tag" (meaning Property Tag) in 4.1.1 reads:

   Tag:  A non-zero-length sequence of ASCII letters and numbers in
      lowercase.

3. The Tag definition above does not have an ABNF definition. This can (and does) lead to confusion for implementers.

The above change to the ABNF removes the ambiguity, without changing the meaning of the ABNF itself.

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--------------------------------------
RFC8659 (draft-ietf-lamps-rfc6844bis-07)
--------------------------------------
Title               : DNS Certification Authority Authorization (CAA) Resource Record
Publication Date    : November 2019
Author(s)           : P. Hallam-Baker, R. Stradling, J. Hoffman-Andrews
Category            : PROPOSED STANDARD
Source              : Limited Additional Mechanisms for PKIX and SMIME
Area                : Security
Stream              : IETF
Verifying Party     : IESG