Re: Libpq: Fail connection attempt if server didn't request a password

Adrian Vogelsgesang <avogelsgesang(at)tableau(dot)com> writes:
> Is there some way to let libpq fail the connection attempt in such a case, i.e. if a password was provided but not requested from the server?

Why would that be a useful thing to do?

> 1. To identify misconfigured server. In our use case, all servers should require a password. By failing hard and early, we can more easily find misconfigured servers

I find that argument quite unconvincing. You can easily look into
pg_hba.conf to see if any lines don't have an auth method you like.
Moreover, that approach scales to requirements that are more complicated
than this specific use-case, and you can be sure that *all* the entries
satisfy your business rule, not just the one you happened to match this
time.

> Can I, as the client, force the authentication used during creating a connection to be scram-sha-256?

There has been discussion of that, but no one has written a patch yet.

regards, tom lane