[cabfpub] CA/Browser Forum ASN.1 module

Ryan Sleevi sleevi at google.com
Mon Feb 27 21:34:15 UTC 2017

On Mon, Feb 27, 2017 at 12:35 PM, Peter Bowen <pzb at amzn.com> wrote:

> First, the modules in the current X.520 SelectedAttributes module all use
> UnboundedDirectoryString, while we expect upper bounds on some strings.

Fair enough, although RFC 5280 defines these upper bounds, and 5280 is
normative. I think the subtlety of 5280 vs X.520 may be lost for some
members, so I think it's reasonable here, although RFC 5912 may be suitable
for incorporation.

> Second, the BRs and EVGs have redefined the content of the attributes
> vis-a-vis X.520, so I think it makes sense to have our own version.

I think this is a much more compelling argument, since we've certainly seen
some confusion from members with respect to the normative constraints of
what this content must cover. Despite the Baseline Requirements defining
rules for the validation/verification of this information, the question of
what this contains (e.g. "country") is surprisingly one that's tripped up
more than a few member CAs.

Thanks for pointing out both of these issues.

> > I found a couple of errors in the tor appendix.  I think I got the
> intent right, but can someone please confirm?
> >
> > Can you clarify the errors you see? A quick visual scan only shows the
> differences being the introduction of the EXTENSION .. IDENTIFIED BY
> syntax, is that correct?
> cabf-caSigningNonce OBJECT IDENTIFIER ::= { cabf 41 }
> cabf-applicantSigningNonce OBJECT IDENTIFIER ::= { cabf 42 }
> Both of these use a “cabf” definition, but this is not defined anywhere.
> I was guessing it is
> cabf ID ::= { joint‐iso‐itu‐t(2) international‐organizations(23)
> ca‐browser‐forum(140) }
> However it could mean something under 2.23.140 (eg. or so).

Ah, good point! I believe the 'intent' was 140.1 (consistent with the
.onion extension). Jeremy, given that DigiCert is issuing these
certificates, can you clarify what you've done in production?

Note, it was a 'bug' that we put the .onion extension on the .1 arc, since
.1 is for policies at https://cabforum.org/object-registry/
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