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Re: [PATCH] Largeobject access controls

From: KaiGai Kohei <kaigai(at)kaigai(dot)gr(dot)jp>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: KaiGai Kohei <kaigai(at)ak(dot)jp(dot)nec(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: [PATCH] Largeobject access controls
Date: 2009-08-28 15:15:44
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Lists: pgsql-hackers
Tom Lane wrote:
> KaiGai Kohei <kaigai(at)ak(dot)jp(dot)nec(dot)com> writes:
>> The attached patch provides access control features on largeobject.
>> This patch adds the ownership and two permissions (SELECT and UPDATE) on
>> largeobjects. The two permissions controls reader and writer accesses to
>> the largeobejcts.
> What about DELETE permissions?  Should we track that separately from

PostgreSQL checks ownership of the database object when user tries to
drop it. This patch also add pg_largeobject_ownercheck() on lo_unlink().

>> The CREATE USER/ROLE statement got a new option: LARGEOBJECT/NOLARGEOBJECT.
>> It enables to controls whether the user can create a largeobject, or not.
> I don't think this is necessary or appropriate.

What should control privilege to create a new largeobject?
Or, it implicitly allows everyone to create a new one?

>> The pg_largeobject system catalog is reworked to manage its metadata.
>> Actual data chunks are stored in the toast relation of pg_largeobject,
> This seems like a very confusing design, and one that (a) breaks
> existing code to no purpose, (b) will greatly complicate in-place
> upgrade.  Instead of abusing a toast relation to do something
> nonstandard, keep pg_largeobject as it is now and add a new, separate
> catalog that carries ownership and permissions info for each LO OID.

It was the original design just before the first commit fest. :-)
I don't have any reason to oppose to it.

KaiGai Kohei <kaigai(at)kaigai(dot)gr(dot)jp>

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