[Smcwg-public] Definition of extant CA
Berge, Jochem Van den
jochem.vanden.berge at logius.nl
Tue Sep 12 04:00:30 UTC 2023
Ballot SMC03 introduced the term "extant CA" as follows:
1. Is a Publicly-Trusted Subordinate CA Certificate whose `notBefore` field is before September 1, 2023 and has issued end entity S/MIME Certificates;
2. The CA Certificate includes no Extended Key Usage extension, contains `anyExtendedKeyUsage` in the EKU extension, or contains `id-kp-emailProtection` in the EKU extension;
3. The CA Certificate complies with the profile defined in [RFC 5280](http://tools.ietf.org/html/rfc5280). The following two deviations from the [RFC 5280](http://tools.ietf.org/html/rfc5280) profile are acceptable:
* The CA Certificate contains a `nameConstraints` extension that is not marked critical;
* The CA Certificate contains a policy qualifier of type UserNotice which contains `explicitText` that uses an encoding that is not permitted by [RFC 5280](http://tools.ietf.org/html/rfc5280) (i.e., the `DisplayText` is encoded using BMPString or VisibleString); and
4. The CA Certificate contains the `anyPolicy` identifier (188.8.131.52.0) or specific OIDs in the `certificatePolicies` extension that do not include those defined in [Section 184.108.40.206](#7161-reserved-certificate-policy-identifiers) of these Requirements.
Now it might seem like nit-picking but we had a question specifically about the first line. If a CA is S/MIME capable but only issues other CA certificates which in turn issue end-user S/MIME certificates is that still be covered by this definition?
PKIoverheid operates a 4-layer hierarchy in which the level 2 CAs only issue CA certificates to Trust Service providers who actually issue end-user (S/MIME and qualified) certificates. We're asking this question because we're currently planning (re)issuance of existing PKIoverheid level 3 CAs to remain compliant with the SBRGs (or move them off S/MIME completely when it is no longer needed) per the timelines stated in Appendix B.
Reading the text verbatim would indicate that the level 2 CAs are not included in the definition of the "extant CA" since it never has and never will issue end-user certificates of any kind but we have our doubts if that is a valid interpretation.
What take do other CAs (or browsers) have on this?
Jochem van den Berge
Compliance officer PKIoverheid
Digital Government Service
Ministry of the Interior and Kingdom Relations
M (+31) (0)6 - 21 16 26 89
T (+31) (0)70 - 888 76 91
jochem.vanden.berge at logius.nl<mailto:jochem.vanden.berge at logius.nl>
workdays Mo-Tue & Thu-Fri
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