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From: Joe Conway <[email protected]>
To: Robert Haas <[email protected]>
Cc: Nathan Bossart <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: Bossart, Nathan <[email protected]>
Cc: Stephen Frost <[email protected]>
Cc: PostgreSQL-development <[email protected]>
Subject: Re: replacing role-level NOINHERIT with a grant-level option
Date: Fri, 1 Jul 2022 08:22:53 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <CA+TgmoZRO3tO_w+ROHW6Xe1fmQfzVyPuZ5OtbYX40w3YBQkMwA@mail.gmail.com>
References: <[email protected]>
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On 7/1/22 07:48, Robert Haas wrote:
> On Fri, Jul 1, 2022 at 6:17 AM Joe Conway <[email protected]> wrote:
>> Would this allow for an explicit REVOKE to override a default INHERIT
>> along a specific path?
> 
> Can you give an example?
> 
> If you mean that A is granted to B which is granted to C which is
> granted to D and you now want NOINHERIT behavior for the B->C link in
> the chain, this would allow that. You could modify the existing grant
> by saying either "REVOKE INHERIT OPTION FOR B FROM C" or "GRANT B TO C
> WITH INHERIT FALSE".

Hmm, maybe I am misunderstanding something, but what I mean is something 
like:

8<----------------
CREATE TABLE t1(f1 int);
CREATE TABLE t2(f1 int);

CREATE USER A; --defaults to INHERIT
CREATE USER B;
CREATE USER C;

GRANT select ON TABLE t1 TO B;
GRANT select ON TABLE t2 TO C;

GRANT B TO A;
GRANT C TO A;

SET SESSION AUTHORIZATION A;

-- works
SELECT * FROM t1;
-- works
SELECT * FROM t2;

RESET SESSION AUTHORIZATION;
REVOKE INHERIT OPTION FOR C FROM A;
SET SESSION AUTHORIZATION A;

-- works
SELECT * FROM t1;
-- fails
SELECT * FROM t2;
8<----------------

So now A has implicit inherited privs for t1 but not for t2.

-- 
Joe Conway
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com

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