Re: PostgreSQL - Weak DH group

Re: Heikki Linnakangas 2016-10-06 <fd6eb3cc-1585-1469-fd9e-763f8e410b19@iki.fi>
> I propose the attached patch. It gives up on trying to deal with multiple
> key lengths (as noted earlier, OpenSSL just always passed keylength=1024, so
> that was useless). Instead of using the callback, it just sets fixed DH
> parameters with SSL_CTX_set_tmp_dh(), like we do for the ECDH curve. The DH
> parameters are loaded from a file called "dh_params.pem" (instead of
> "dh1024.pem"), if present, otherwise the built-in 2048 bit parameters are
> used.

Shouldn't this be a GUC pointing to a configurable location like
ssl_cert_file? This way, people reading the security section of the
default postgresql.conf would notice that there's something (new) to
configure. (And I wouldn't want to start creating symlinks from PGDATA
to /etc/ssl/something again...)

Thanks,
Christoph