[cabfpub] Ballot 214: CAA Discovery CNAME Errata

Wed Sep 13 21:30:34 UTC 2017

Kicking off the official discussion period for ballot 214 today per
discussion with Phillip.

The following motion has been proposed by Phillip Hallam-Baker of Comodo
Group Inc. and endorsed by Gervase Markham of Mozilla and Mads Egil
Henriksveen of Buypass.

-- MOTION BEGINS --

In the Baseline Requirements v1.4.9 Section 3.2.2.8. CAA Records

Strike:

As part of the issuance process, the CA MUST check for a CAA record for
each dNSName in the subjectAltName extension of the certificate to be
issued, according to the procedure in RFC 6844, following the processing
instructions set down in RFC 6844 for any records found. If the CA issues,
they MUST do so within the TTL of the CAA record, or 8 hours, whichever is
greater.

Replace with:

As part of the issuance process, the CA MUST check for CAA records and
follow the processing instructions for any records found, for each dNSName
in the subjectAltName extension of the certificate to be issued, as
specified in RFC 6844 as amended by Errata 5065 (Appendix A). If the CA
issues, they MUST do so within the TTL of the CAA record, or 8 hours,
whichever is greater.

In the Baseline Requirements ADD an Appendix A that reads:

Appendix A -- RFC6844 Errata 5065

The following errata report has been held for document update for RFC6844,
"DNS Certification Authority Authorization (CAA) Resource Record".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5065

--------------------------------------
Status: Held for Document Update
Type: Technical

Reported by: Phillip Hallam-Baker <philliph at comodo.com> Date Reported:
2017-07-10 Held by: EKR (IESG)

Section: 4

Original Text
-------------
   Let CAA(X) be the record set returned in response to performing a CAA
   record query on the label X, P(X) be the DNS label immediately above
   X in the DNS hierarchy, and A(X) be the target of a CNAME or DNAME
   alias record specified at the label X.

   o  If CAA(X) is not empty, R(X) = CAA (X), otherwise

   o  If A(X) is not null, and R(A(X)) is not empty, then R(X) =
      R(A(X)), otherwise

   o  If X is not a top-level domain, then R(X) = R(P(X)), otherwise

   o  R(X) is empty.

Corrected Text
--------------
   Let CAA(X) be the record set returned in response to performing a CAA
   record query on the label X, P(X) be the DNS label immediately above
   X in the DNS hierarchy, and A(X) be the target of a CNAME or DNAME
   alias record chain specified at the label X.

   o  If CAA(X) is not empty, R(X) = CAA (X), otherwise

   o  If A(X) is not null, and CAA(A(X)) is not empty, then R(X) =
      CAA(A(X)), otherwise

   o  If X is not a top-level domain, then R(X) = R(P(X)), otherwise

   o  R(X) is empty.

  Thus, when a search at node X returns a CNAME record, the CA will
  follow the CNAME record chain to its target. If the target label
  contains a CAA record, it is returned.

  Otherwise, the CA continues the search at
  the parent of node X.

  Note that the search does not include the parent of a target of a
  CNAME record (except when the CNAME points back to its own path).

  To prevent resource exhaustion attacks, CAs SHOULD limit the length of
  CNAME chains that are accepted. However CAs MUST process CNAME
  chains that contain 8 or fewer CNAME records.

--Motion Ends--

The procedure for approval of this Final Maintenance Guideline ballot is as
follows (exact start and end times may be adjusted to comply with
applicable Bylaws and IPR Agreement):

BALLOT 214 Status:   Final Maintenance Guideline    Start time (22:00
UTC)    End time (22:00 UTC)

Discussion begins now and ends September 20, 2017 22:00 UTC (7 days)

Vote for approval begins September 20, 2017 22:00 UTC and ends September
27, 2017 22:00 UTC (7 days)

If vote approves ballot: Review Period (Chair to send Review Notice) (30
days). If Exclusion Notice(s) filed, ballot approval is rescinded and PAG
to be created. If no Exclusion Notices filed, ballot becomes effective at
end of Review Period.    Upon filing of Review Notice by Chair 30 days
after filing of Review Notice by Chair

>From Bylaw 2.3: If the Draft Guideline Ballot is proposing a Final
Maintenance Guideline, such ballot will include a redline or comparison
showing the set of changes from the Final Guideline section(s) intended to
become a Final Maintenance Guideline, and need not include a copy of the
full set of guidelines. Such redline or comparison shall be made against
the Final Guideline section(s) as they exist at the time a ballot is
proposed, and need not take into consideration other ballots that may be
proposed subsequently, except as provided in Bylaw Section 2.3(j).

Votes must be cast by posting an on-list reply to this thread on the Public
list. A vote in favor of the motion must indicate a clear 'yes' in the
response. A vote against must indicate a clear 'no' in the response. A vote
to abstain must indicate a clear 'abstain' in the response. Unclear
responses will not be counted. The latest vote received from any
representative of a voting member before the close of the voting period
will be counted. Voting members are listed here:
https://cabforum.org/members/

In order for the motion to be adopted, two thirds or more of the votes cast
by members in the CA category and greater than 50% of the votes cast by
members in the browser category must be in favor. Quorum is shown on
CA/Browser Forum wiki. Under Bylaw 2.2(g), at least the required quorum
number must participate in the ballot for the ballot to be valid, either by
voting in favor, voting against, or abstaining.
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