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From: David G. Johnston <[email protected]>
To: Tom Lane <[email protected]>
Cc: Pavel Luzanov <[email protected]>
Cc: Christophe Pettus <[email protected]>
Cc: pgsql-general <[email protected]>
Subject: Re: v16 roles, SET FALSE, INHERIT FALSE, ADMIN FALSE
Date: Mon, 8 Jul 2024 14:59:51 -0700
Message-ID: <CAKFQuwYdD-rUZy7nYCi0K-RxvL-=s1wMHU6hqdBNY7VsaCwv3A@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On Mon, Jul 8, 2024 at 2:16 PM Tom Lane <[email protected]> wrote:

> Pavel Luzanov <[email protected]> writes:
> > On 08.07.2024 22:22, Christophe Pettus wrote:
> >> This is more curiosity than anything else.  In the v16 role system, is
> there actually any reason to grant membership in a role to a different
> role, but with SET FALSE, INHERIT FALSE, and ADMIN FALSE?  Does the role
> granted membership gain any ability it didn't have before in that case?
>
> > Looks like there is one ability.
> > Authentication in pg_hba.conf "USER" field via +role syntax.
>
> Hmm, if that check doesn't require INHERIT TRUE I'd say it's
> a bug.
>
>
The code doesn't support that claim.  It seems quite intentional that this
check is purely on membership - what with ACL having a dedicated function
for the purpose of checking plain recursive membership that only this and
the circularity check code use.  I suppose it makes sense too - at least
unless you also check for SET - since it seems desirable to allow login as
a member role to a group you can only SET to and don't inherit from.

David J.

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