settings to control SSL/TLS protocol version

On Monday, November 5, 2018, David Fetter <david@fetter.org> wrote:

> On Mon, Nov 05, 2018 at 03:01:58PM -0500, Robert Haas wrote:
> > On Mon, Oct 1, 2018 at 4:21 PM Peter Eisentraut
> > <peter.eisentraut@2ndquadrant.com> wrote:
> > >
> > > Attached is a patch that implements this.  For example:
> > >
> > >     ssl_min_protocol_version = 'TLSv1'
> > >     ssl_max_protocol_version = 'any'
> >
> > +1.  Maybe it would make sense to spell 'any' as the empty string.
> > Intuitively, it makes more sense to me to think about there being no
> > maximum than to think about the maximum being anything.
>
> ..and now, I'm finally beginning to see the reasoning that led Oracle
> to conflate NULL and empty string.
>

Seems like a situation for ‘n/a’ though maybe that’s too English-centric...

I’m a bit uncertain about the mix of name and number in something that
purports to be a version and thus should be numeric only.  SSLv3 and TLSv2
would not be comparable in terms of min/max...but I haven’t delved deeply
into the feature either.

David J.