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Re: [v9.2] Fix Leaky View Problem

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Noah Misch <noah(at)leadboat(dot)com>
Cc: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, Kohei(dot)Kaigai(at)emea(dot)nec(dot)com, kaigai(at)kaigai(dot)gr(dot)jp, thom(at)linux(dot)com, pgsql-hackers(at)postgresql(dot)org, tgl(at)sss(dot)pgh(dot)pa(dot)us
Subject: Re: [v9.2] Fix Leaky View Problem
Date: 2011-09-26 03:22:56
Message-ID: CA+TgmobdXV3qFBJqpe=WHiot2Kzi5Qi4jE8MUGbWhujmn13EZQ@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Sun, Sep 25, 2011 at 10:38 PM, Noah Misch <noah(at)leadboat(dot)com> wrote:
> On Sun, Sep 25, 2011 at 11:22:03AM -0500, Kevin Grittner wrote:
>> Robert Haas  09/25/11 10:58 AM >>>
>>
>> > I'm not sure we've been 100% consistent about that, since we
>> > previously made CREATE OR REPLACE LANGUAGE not replace the owner
>> > with the current user.
>>
>> I think we've been consistent in *not* changing security on an
>> object when it is replaced.
>
>> [CREATE OR REPLACE FUNCTION does not change proowner or proacl]
>
> Good point.  C-O-R VIEW also preserves column default values.  I believe we are
> consistent to the extent that everything possible to specify in each C-O-R
> statement gets replaced outright.  The preserved characteristics *require*
> commands like GRANT, COMMENT and ALTER VIEW to set in the first place.
>
> The analogue I had in mind is SECURITY DEFINER, which C-O-R FUNCTION reverts to
> SECURITY INVOKER if it's not specified each time.  That default is safe, though,
> while the proposed default of security_barrier=false is unsafe.

Even though I normally take the opposite position, I still like the
idea of dedicated syntax for this feature.  Not knowing what view
options we might end up with in the future, I hate having to decide on
what the general behavior ought to be.  But it would be easy to decide
that CREATE SECURITY VIEW followed by CREATE OR REPLACE VIEW leaves
the security flag set; it would be consistent with what we're doing
with owner and acl information and wouldn't back us into any
unpleasant decisions down the road.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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