Re: Permission select pg_stat_replication

As an adhoc solution on 9.2, you can do something like this:

1. Create a function that extracts all from pg_stat_replication:

create or replace function pg_stat_repl() returns setof
pg_catalog.pg_stat_replication as $$begin return query(select * from
pg_catalog.pg_stat_replication); end$$ language plpgsql security definer;

2. Create a view that uses this function to get data in it:

create view public.pg_stat_repl as select * from pg_stat_repl();

3. Grant select on this view to your unprivileged user, sat 'common_user' :

grant select on public.pg_stat_repl to common_user;

After this, you can do a select on this view to get the required
information. You can do this for other pg_catalog functions as well.
Reference -
https://github.com/xzilla/secure_check_postgres/blob/master/sql/pg_stat_activity.sql

Payal Singh,
Database Administrator,
OmniTI Computer Consulting Inc.
Phone: 240.646.0770 x 253

On Tue, Mar 31, 2015 at 1:52 PM, <jesse(dot)waters(at)gmail(dot)com> wrote:

> Stephen,
>
> Thanks for the information. We are currently running 9.2 instance
> which we are using streaming replication for DR. I do not see an
> upgrade anytime in the near future to 9.4 or later due to specfic
> requirements for our application.
>
> Will your modifications be backported to 9.2?
>
> TIA,
>
> Jesse
>
>
> ps, sorry gilberto, selected wrong send to
>
> On Tue, Mar 31, 2015 at 10:47 AM, Gilberto Castillo
> <gilberto(dot)castillo(at)etecsa(dot)cu> wrote:
> >
> >
> >> Gilberto,
> >>
> >> * Gilberto Castillo (gilberto(dot)castillo(at)etecsa(dot)cu) wrote:
> >>> > * Gilberto Castillo (gilberto(dot)castillo(at)etecsa(dot)cu) wrote:
> >>> >> > * jesse(dot)waters(at)gmail(dot)com (jesse(dot)waters(at)gmail(dot)com) wrote:
> >>> >> >> Could someone tell me what permission is required to
> >>> >> >> select * from pg_stat_replication; ?
> >>> >> >
> >>> >> > Currently, you're required to have superuser rights.
> >>> >> >
> >>> >> >> I like to setup a monitor to query database with minimal
> >>> privileges
> >>> >> >> necessary.
> >>> >> >
> >>> >> > I agree 110% and am actively working to fix exactly this issue. I
> >>> >> hope
> >>> >> > to have a patch in the next day or so which will allow you to
> GRANT
> >>> >> > rights to such a monitor user which will allow that user to see
> all
> >>> >> the
> >>> >> > contents of pg_stat_replication.
> >>> >> >
> >>> >> > One thing which would be really great is if you have time to test
> >>> with
> >>> >> > the patch I'm working up (it's against 9.5, but this is strictly
> >>> >> > functionality testing and should be just in in a dev/test
> >>> environment,
> >>> >> > I wouldn't suggest running 9.5 in production, of course!).
> >>> > [...]
> >>> >> SET SESSION AUTHORIZATION postgres;
> >>> >>
> >>> >> GRANT SELECT ON pg_stat_replication TO usuario1;
> >>> >
> >>> > This is (essentially) what I'm hoping to enable. Note that this
> won't
> >>> > do anything for you today as the view is already available to all
> >>> users
> >>> > on the system and it's actually the function underneath which is
> >>> > filtering the result set.
> >>>
> >>> ALTER DEFAULT PRIVILEGES FOR ROLE postgres GRANT SELECT ON VIEWS TO
> >>> usuario1;
> >>>
> >>> Nor does it work?
> >>
> >> No. Feel free to try, but there's an explicit check in the C code which
> >> is what the SQL-level function that's under the view is calling. In
> >> current 9.5/master, at least, it's at:
> >>
> >> src/backend/replication/walsender.c:2797
> >>
> >> if (!superuser())
> >> {
> >> /*
> >> * Only superusers can see details. Other users only get the
> >> pid
> >> * value to know it's a walsender, but no details.
> >> */
> >> MemSet(&nulls[1], true, PG_STAT_GET_WAL_SENDERS_COLS - 1);
> >> }
> >>
> >
> >
> > Thanks Stephen for you information.
> >
> >
> > Rgds,
> > Gilberto Castillo
> > La Habana, Cuba
> >
> > ---
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>
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