From: Tom Lane <tgl@sss.pgh.pa.us>
To: Gustavsson Mikael <mikael.gustavsson@smhi.se>
cc: Stephen Frost <sfrost@snowman.net>, Magnus Hagander <magnus@hagander.net>,
        Kyotaro Horiguchi <horikyota.ntt@gmail.com>,
        "pgsql-general@postgresql.org" <pgsql-general@postgresql.org>,
        Svensson Peter <peter.svensson@smhi.se>
Subject: Re: SV: SV: SV: SV: Problem with ssl and psql in Postgresql 13
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Comments: In-reply-to Gustavsson Mikael <mikael.gustavsson@smhi.se>
	message dated "Wed, 23 Dec 2020 09:50:25 +0000"
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Date: Wed, 23 Dec 2020 11:28:21 -0500
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Gustavsson Mikael <mikael.gustavsson@smhi.se> writes:
> I did a final test before logging out for Christmas because i found a th=
read in hackers discussing some issue with GSS and SSL.
> So if i set gssencmode=3Ddisable on my pgsql-13 to postgres 13 server co=
nnection i get an SSL connection.

Oooh ... that's the missing ingredient.  Do you have a GSS credentials
cache on the client side, but no support on the server side?

It looks like, if there is a credentials cache and gssencmode isn't
explicitly disabled, we try GSS first.  If the server refuses that:

                    if (gss_ok =3D=3D 'N')
                    {
                        /* Server doesn't want GSSAPI; fall back if we can=
 */
                        if (conn->gssencmode[0] =3D=3D 'r')
                        {
                            appendPQExpBufferStr(&conn->errorMessage,
                                                 libpq_gettext("server doe=
sn't support GSSAPI encryption, but it was required\n"));
                            goto error_return;
                        }

                        conn->try_gss =3D false;
                        conn->status =3D CONNECTION_MADE;
                        return PGRES_POLLING_WRITING;
                    }

that is, it decides the connection it has is good enough.  This
is not OK if SSL should have been used.

			regards, tom lane