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Re: Should creating a new base type require superuser status?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Gregory Stark <stark(at)enterprisedb(dot)com>
Cc: pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: Should creating a new base type require superuser status?
Date: 2008-07-30 21:29:48
Message-ID: 23742.1217453388@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Gregory Stark <stark(at)enterprisedb(dot)com> writes:
> I know when I was first starting out it was a big source of frustration that
> you have to get those arguments right.. Until I figured out what they all
> meant and how to use them I was constantly crashing the server.

> It seems to me we should be able to do better. To have some kind of struct in
> the C code associated with the input/output functions from which the create
> type command picks up these parameters.

And what are the odds that you'll get it right in a C struct if you
couldn't get it right in the SQL command?  There might be some small
advantage here from a packaging standpoint, but I think the argument
that it'd help novice PG hackers is bogus.

> As a consequence we could perhaps aim to make creating new types safe rather
> than just deal with the fact that it's not safe currently? It would be nice if
> non-superusers could create types which used an existing set of input/output
> functions but defined new semantics.

Unless you're going to allow them to create new C functions, I'm not
clear on how much they're going to be able to change the semantics.

>> * The just-added ability to specify a new type's type category and
>> "preferred" status could allow subverting the behavior of existing
>> queries that expect ambiguous operators to be resolved in a particular
>> way.  A new preferred type could "capture" such queries and thereby
>> provide a trojan-horse vector for executing functions as some other
>> user.

> Would it be enough to only require super-user to create a preferred type?

Well, it'd close one hole, but I think there are too many others to
take a narrow-gauge approach.

			regards, tom lane

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