Okay :-(
But: I think this is an error in the rewrite system. I think this query
should get rewritten !
Can we fix this ?
Andreas
> ----------
> Von: Jan Wieck[SMTP:jwieck@debis.com]
> Antwort an: Jan Wieck
> Gesendet: Donnerstag, 19. Februar 1998 15:53
> An: Zeugswetter Andreas SARZ
> Cc: pgsql-hackers@hub.org
> Betreff: Re: [HACKERS] Solution to the pg_user passwd problem !?? (c)
>
> >
> > Hi all,
> >
> > What about:
> > grant select on pg_user to public;
> > create rule pg_user_hide_pw as on
> > select to pg_user.passwd
> > do instead select '********' as passwd;
> >
> > Then if I do:
> > select * from pg_user;
> > usename |usesysid|usecreatedb|usetrace|usesuper|usecatupd|passwd
> |valuntil
> >
> --------+--------+-----------+--------+--------+---------+--------+-------
> --
> > -------------------
> > postgres| 6|t |t |t |t |********|Sat
> Jan
> > 31 07:00:00 2037 NFT
> > zeus | 60|t |t |f |t |********|
> > (2 rows)
> >
> > Also the \d works for all users !
> >
> > Only "disadvantage" is that noone can read passwd without first dropping
> the
> > rule pg_user_hide_pw,
> > I consider this a feature though ;-)
> >
> > Since the userauthentication bypasses the rewrite mechanism the logins,
> > alter user .. and others do work !
> >
> > Can all of you try to crack this ?
>
> Cracked!
>
> create table get_passwds (usename name, passwd text);
> insert into get_passwds select usename, passwd from pg_user;
> select * from get_passwds;
> usename|passwd
> -------+------
> pgsql |
> wieck |test
> (2 rows)
>
>
>
> Sorry, Jan
>
> --
>
> #======================================================================#
> # It's easier to get forgiveness for being wrong than for being right. #
> # Let's break this rule - forgive me. #
> #======================================== jwieck@debis.com (Jan Wieck) #
>
>
>
