[cabfpub] CAA final errata proposed text
Rob Stradling
rob.stradling at comodo.com
Wed Jun 14 20:29:54 UTC 2017
LGTM.
Minor nit: "otherwise" needs a capital O.
On 14/06/17 18:52, Phillip via Public wrote:
> The RFC Editor has deleted all three of the existing errata at my
> request. I would like for the next errata to be the very last.
>
> Could people read, review and state if this works for them?
>
> 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 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 ten or fewer CNAME records.
>
> Processing for DNAME is exactly the same as for CNAME. Note that since
>
> DNAME records are implemented by creating the corresponding CNAME
>
> records on the fly, it is only necessary for DNAME records to appear
>
> on the wire for purposes of DNSSEC.
>
>
>
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>
--
Rob Stradling
Senior Research & Development Scientist
COMODO - Creating Trust Online
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