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Re: custom variable classes

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Andrew Dunstan <andrew(at)dunslane(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: custom variable classes
Date: 2007-02-04 04:06:26
Message-ID: 200702040406.l1446QO16844@momjian.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Added to TODO:

  * Allow custom variable classes that can restrict who can set the values

    http://archives.postgresql.org/pgsql-hackers/2006-11/msg00911.php


---------------------------------------------------------------------------

Tom Lane wrote:
> Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
> > One thing I want to look at for 8.3 is improving custom variable 
> > classes. Right now these are all user settable, which makes them quite 
> > inappropriate for security related settings (such as which perl modules 
> > to load for use by trusted plperl). I'm wondering if we should perhaps 
> > allow something like:
> 
> >   custom_variable_classes = 'foo'
> >   foo:<security_level>.bar = 'blurfl'
> 
> This seems really ugly --- for one thing, what if the DBA gets it wrong?
> 
> The value won't mean anything until the code that uses it gets loaded,
> at which time the correct GucContext for the variable will be supplied.
> How about we just compare that to the current definition source of the
> value, and if we see it's been set improperly, revert the value to
> default?
> 
> It might also be a good idea to disallow ALTER USER/DATABASE SET for a
> custom variable that's a placeholder, since we don't at that time know
> if the value should be SUSET or not; and there seems no pressing need to
> allow these ALTERs to be done without having loaded the defining module.
> 
> [ thinks for a bit... ]  With that provision in place, I think it would
> be safe to revert to the "reset" value instead of the wired-in default,
> which would be marginally nicer.
> 
> 			regards, tom lane
> 
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-- 
  Bruce Momjian   bruce(at)momjian(dot)us
  EnterpriseDB    http://www.enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +

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