* Warn on empty Subject field for issuers
When generating a root or signing an intermediate certificate, it is
possible to have Vault generate a certificate with an empty Subject.
These don't validate in most TLS implementations well, so add a warning.
Note that non-Common Name fields could be present to make a non-empty
subject, so simply requiring a CommonName isn't strictly the best.
For example:
$ vault write pki/root/generate/exported common_name=""
WARNING! The following warnings were returned from Vault:
* This issuer certificate was generated without a Subject; this makes
it likely that issuing leaf certs with this certificate will cause TLS
validation libraries to reject this certificate.
....
Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>
* Add changelog
Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>
Alexander Scheel