Re: pgsql: Add libpq parameter 'channel_binding'.

On Mon, 2019-09-30 at 16:08 +0900, Michael Paquier wrote:
> So, something like the attached looks better to me.  Using a server
> which publishes SCRAM-SHA-256-PLUS, I get the following over SSL:
> 1) client supports channel binding:
> 1-1) channel_binding = disable => OK, with SCRAM-SHA-256 
> 1-2) channel_binding = prefer => OK, with SCRAM-SHA-256-PLUS
> 1-3) channel_binding = require => OK, with SCRAM-SHA-256-PLUS
> 2) client does not support channel binding
> 2-1) channel_binding = disable => OK, with SCRAM-SHA-256
> 2-2) channel_binding = prefer => OK, with SCRAM-SHA-256
> 2-3) channel_binding = require => failure with new error message,
> instead of the confusing one.

For 2-3, shouldn't we error at an earlier stage? The user of the client
has requested something impossible to satisfy.

Regards,
    Jeff Davis