[Servercert-wg] Draft Ballot: Precertificates and OCSP

Rob Stradling rob at sectigo.com
Tue Oct 1 01:37:36 MST 2019

I'll endorse for Sectigo.

On 01/10/2019 02:16, Jeremy Rowley via Servercert-wg wrote:
> DigiCert will endorse.
> *From:* Servercert-wg <servercert-wg-bounces at cabforum.org> *On Behalf Of 
> *Wayne Thayer via Servercert-wg
> *Sent:* Monday, September 30, 2019 5:12 PM
> *To:* CA/B Forum Server Certificate WG Public Discussion List 
> <servercert-wg at cabforum.org>
> *Subject:* Re: [Servercert-wg] Draft Ballot: Precertificates and OCSP
> Thanks Jacob, Rob, and Ryan for the outstanding feedback. Below is a 
> draft incorporating your changes, except for Jacob's proposed 
> clarification (I see the point, but I don't think it's really any clearer).
> Could I ask for two endorsers for this ballot?
> - Wayne
> ========================
> Purpose of Ballot:
> This ballot intends to clarify requirements placed on precertificates in 
> BR section
> During a lengthy discussion on the mozilla.dev.security.policy forum 
> [1], it was discovered that BR section 4.9.10 combined with BR section 
> prevents a CA from responding “good” for a precertificate. This 
> is a problem because there is no guarantee that a certificate 
> corresponding to a precertificate has not been issued, resulting in root 
> store policies such as [2] that require CAs to treat the existence of a 
> precertificate as a presumption that a corresponding certificate has 
> been issued and thus that a valid OCSP response is required.
> This ballot intends to resolve the problem by reducing the scope of 
> section This section was originally [3] intended only to 
> address duplicate serial numbers that would violate RFC 5280 section 
> In addition, this ballot removes legacy effective dates from BR 
> section 4.9.10.
> [1] 
> https://groups.google.com/d/msg/mozilla.dev.security.policy/LC_y8yPDI9Q/NbOmVB77AQAJ
> [2] 
> https://wiki.mozilla.org/CA/Required_or_Recommended_Practices#Precertificates
> [3] https://cabforum.org/pipermail/public/2014-January/002694.html
> The following motion has been proposed by Wayne Thayer of Mozilla and 
> endorsed by XXX of YYY and XXX of YYY.
> This ballot modifies the “Baseline Requirements for the Issuance and 
> Management of Publicly-Trusted Certificates” as follows, based on 
> Version 1.6.6:
> *REPLACE section of the Baseline Requirements in its entirety with:*
> Application of RFC 5280
> For purposes of clarification, any Precertificate MAY have the same 
> serial number as exactly one certificate that is not a Precertificate, 
> provided that the two are related as described in RFC 6962. This is a 
> modification of the uniqueness requirements of RFC 5280 section
> *REPLACE section 4.9.10 of the Baseline Requirements as follows:*
> The CA SHALL support an OCSP capability using the GET method for 
> Certificates issued in accordance with these Requirements.
> For the status of Subscriber Certificates:
> The CA SHALL update information provided via an Online Certificate 
> Status Protocol at least every four days. OCSP responses from this 
> service MUST have a maximum expiration time of ten days.
> For the status of Subordinate CA Certificates:
> The CA SHALL update information provided via an Online Certificate 
> Status Protocol at least (i) every twelve months and (ii) within 24 
> hours after revoking a Subordinate CA Certificate.
> If the OCSP responder receives an OCSP request but has no record of ever 
> having issued any certificate with the certificate serial number in that 
> request, using any current or previous issuing key for the CA subject, 
> then the responder SHOULD NOT respond with a "good" status. OCSP 
> responders for CAs that are not Technically Constrained in line with 
> Section 7.1.5 MUST NOT respond with a "good" status for such 
> certificates. The CA SHOULD monitor the responder for such requests as 
> part of its security response procedures.
> A comparison of the changes can be found at:<TBD> 
> <https://github.com/wthayer/documents/compare/master...wthayer:EV-Subject-Information>
> The procedure for approval of this ballot is as follows:
> Discussion (7+ days)
> Start Time: TBD UTC
> End Time: TBD UTC
> Vote for approval (7 days)
> Start Time: TBD
> End Time: TBD
> _______________________________________________
> Servercert-wg mailing list
> Servercert-wg at cabforum.org
> http://cabforum.org/mailman/listinfo/servercert-wg

Rob Stradling
Senior Research & Development Scientist
Email: rob at sectigo.com
Bradford, UK
Office: +441274024707
Sectigo Limited

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