Re: [pkix] [saag] Fwd: New Version Notification for draft-belyavskiy-certificate-limitation-policy-04.txt

Nikos Mavrogiannopoulos <nmav@gnutls.org> Wed, 13 September 2017 06:40 UTC

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From: Nikos Mavrogiannopoulos <nmav@gnutls.org>
Date: Wed, 13 Sep 2017 08:39:21 +0200
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To: Dmitry Belyavsky <beldmit@gmail.com>
Cc: "saag@ietf.org" <saag@ietf.org>, LAMPS <spasm@ietf.org>, dev-security-policy@lists.mozilla.org, pkix@ietf.org
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Subject: Re: [pkix] [saag] Fwd: New Version Notification for draft-belyavskiy-certificate-limitation-policy-04.txt
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On Tue, Sep 12, 2017 at 2:59 PM, Dmitry Belyavsky <beldmit@gmail.com> wrote:
> Hello,
>
> Here is the new version of the draft updated according to the discussion on
> mozilla-dev-security list.

Hi,
 It seems that most of the details of the underlying format are
missing. As far as I understand it is mostly an intentions document at
this point right? I have few comments:

1. requiredX509extensions: What's the reasoning behind this? If these
extensions are required and not present why keep the root certificate
in the trust store?

2. What is the difference between issuedNotAfter and trustNotAfter?
The description text is unclear to me.

3. applicationNameConstraints: very useful, however it is unclear from
the ASN.1 description how are these stored.

4. How do you handle extensions to this format?

Overall, why not use X.509 extensions to store such additional
constraints? We already (in the p11-kit trust store in Fedora/RHEL
systems) use the notion of stapled extensions to limit certificates
[0, 1] and seems quite a flexible approach. Have you considered that
path?

regards,
Nikos

[0]. https://p11-glue.freedesktop.org/doc/storing-trust-policy/storing-trust-model.html
[1]. http://nmav.gnutls.org/2016/06/restricting-scope-of-ca-certificates.html