Date: Thu, 26 Oct 2017 17:07:33 -0500
From: Nico Williams <nico@cryptonector.com>
To: Pavel Stehule <pavel.stehule@gmail.com>
Cc: PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Subject: Re: proposal: schema variables
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On Thu, Oct 26, 2017 at 09:21:24AM +0200, Pavel Stehule wrote:
> Comments, notes?

I like it.

I would further like to move all of postgresql.conf into the database,
as much as possible, as well as pg_ident.conf and pg_hba.conf.

Variables like current_user have a sort of nesting context
functionality: calling a SECURITY DEFINER function "pushes" a new value
onto current_user, then when the function returns the new value of
current_user is "popped" and the previous value restored.

It might be nice to be able to generalize this.

Questions that then arise:

 - can one see up the stack?
 - are there permissions issues with seeing up the stack?

I recently posted proposing a feature such that SECURITY DEFINER
functions could observe the _caller_'s current_user.

Nico
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