Re: Inserts restricted to a trigger - Mailing list pgsql-general

From Torsten Förtsch
Subject Re: Inserts restricted to a trigger
Date
Msg-id CAKkG4_mu=--NFCJO1R7n5DfXPX7Y+RcxFPha7d7e9ppsebncXg@mail.gmail.com
Whole thread Raw
In response to Re: Inserts restricted to a trigger  (Miles Elam <miles.elam@productops.com>)
Responses Re: Inserts restricted to a trigger
List pgsql-general
Have you tried session_user?

create function xx() returns table (cur text, sess text)
security definer language sql as $$
    select current_user::text, session_user::text;
$$;

Then log in as different user and:

=> select (xx()).*;
   cur    | sess   
----------+-------
 postgres | write


On Tue, Jun 18, 2019 at 6:30 PM Miles Elam <miles.elam@productops.com> wrote:
That seems straightforward. Unfortunately I also want to know the user/role that performed the operation. If I use SECURITY DEFINER, I get the superuser account back from CURRENT_USER, not the actual user.

Sorry, should have included that in the original email. How do I restrict access while still retaining info about the current user/role?


On Mon, Jun 17, 2019 at 5:47 PM <raf@raf.org> wrote:
Adrian Klaver wrote:

> On 6/17/19 4:54 PM, Miles Elam wrote:
> > Is there are way to restrict direct access to a table for inserts but
> > allow a trigger on another table to perform an insert for that user?
> >
> > I'm trying to implement an audit table without allowing user tampering
> > with the audit information.
>
> Would the below not work?:
> CREATE the table as superuser or other privileged user
> Have trigger function run as above user(use SECURITY DEFINER)

and make sure not to give any other users insert/update/delete
permissions on the audit table.

> > Thanks in advance,
> >
> > Miles Elam
>
> --
> Adrian Klaver
> adrian.klaver@aklaver.com


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