"David G. Johnston" <david.g.johnston@gmail.com> writes:
>> So, why a role with NOCREATEDB can create a role who can create DB?
> Cannot answer why but given it is documented as working this way this isn’t
> a bug.
Yeah, that's deliberate. CREATEROLE is intended to be sufficient
privilege for all day-to-day user/role administration, so that you
don't have to use a superuser bit for that. The only restriction
on it is you can't manufacture new superuser roles ... but you
definitely can manufacture roles that have other privileges you
don't have yourself. In particular, a CREATEROLE role can issue
GRANTs for privileges it doesn't have itself; so the behavior with
respect to CREATEDB isn't different from that.
regards, tom lane
