[Freeipa-devel] [PATCH] 0095 cert-request: allow directoryName in SAN extension

[Jan Cholasta]

Hi,

On 22.7.2016 07:18, Fraser Tweedale wrote:
> While I was poking around SAN-processing code, I decided to
> implement a small enhancement: allowing the subject principal's DN
> to appear in SAN.
>
> https://fedorahosted.org/freeipa/ticket/6112
>
> Patch depends on my other patches 0090, 0092, 0093, 0094.

I don't think this is how DN SANs are supposed to be handled. For 
example, see this bit about DN name constraints in RFC 5280 section 
4.2.1.10:

    Restrictions of the form directoryName MUST be applied to the subject
    field in the certificate (when the certificate includes a non-empty
    subject field) and to any names of type directoryName in the
    subjectAltName extension.

It would appear to me that DN SANs only provide additional values to the 
subject name of the certificate and thus should be treated the same way 
as the subject name.

We don't impose any restrictions on subject names with regard to DN of 
the subject LDAP entry, so I think we should not do it for DN SANs as 
well. Or, alternatively, we should do it for both.

Honza

-- 
Jan Cholasta