From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Albe Laurenz <laurenz(dot)albe(at)wien(dot)gv(dot)at>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Questions and experiences writing a Foreign Data Wrapper |
Date: | 2011-07-22 16:05:12 |
Message-ID: | CA+TgmoZ3FAuEck7dG8LNeOn4jrKn1upsK2pp7mqOw7TPBRToNQ@mail.gmail.com |
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Lists: | pgsql-hackers |
On Fri, Jul 22, 2011 at 12:02 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> On Fri, Jul 22, 2011 at 10:01 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>>> I am not, however, convinced that that's a legitimate reading of the SQL
>>> spec. Surely user mappings are meant to constrain which users can
>>> connect to a given foreign server.
>
>> Surely that's the job for the table's ACL, no?
>
> No, a table ACL constrains access to a table. Different issue.
>
> In particular I find the following in SQL-MED:2008 4.14.1:
>
> NOTE 9 - Privileges granted on foreign tables are not privileges to use
> the data constituting foreign tables, but privileges to use the
> definitions of the foreign tables. The privileges to access the data
> constituting the foreign tables are enforced by the foreign server,
> based on the user mapping. Consequently, a request by an SQL-client to
> access external data may raise exceptions.
I read that to mean that the remote side might chuck an error
depending on the credentials used to connect. I don't read it to be
saying that the local side is required to do anything in particular.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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