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Re: Non-superuser subscription owners

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: Jeff Davis <pgsql@j-davis.com>, Jacob Champion <jchampion@timescale.com>
Cc: Robert Haas <robertmhaas@gmail.com>, Mark Dilger <mark.dilger@enterprisedb.com>, Amit Kapila <amit.kapila16@gmail.com>, Andrew Dunstan <andrew@dunslane.net>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2023-01-23T01:52:55Z
Lists: pgsql-hackers 
Hi,

On 2023-01-22 09:05:27 -0800, Jeff Davis wrote:
> On Sat, 2023-01-21 at 14:01 -0800, Andres Freund wrote:
> > There are good reasons to have 'peer' authentication set up for the
> > user
> > running postgres, so admin scripts can connect without issues. Which
> > unfortunately then also means that postgres_fdw etc can connect to
> > the current
> > database as superuser, without that check. Which imo clearly is an
> > issue.
> 
> Perhaps we should have a way to directly turn on/off authentication
> methods in libpq through API functions and/or options?

Yes. There's an in-progress patch adding, I think, pretty much what is
required here:
https://www.postgresql.org/message-id/9e5a8ccddb8355ea9fa4b75a1e3a9edc88a70cd3.camel@vmware.com

require_auth=a,b,c

I think an allowlist approach is the right thing for the subscription (and
postgres_fdw/dblink) use case, otherwise we'll add some auth method down the
line without updating what's disallowed in the subscription code.


> > Why is this only about local files, rather than e.g. also using the local
> > user?
> 
> It's not, but we happen to already have pg_read_server_files, and it
> makes sense to use that at least for files referenced directly in the
> connection string. You're right that it's incomplete, and also that it
> doesn't make a lot of sense for files accessed indirectly.

I just meant that we need to pay attention to user-based permissions as well.

Greetings,

Andres Freund

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Fix possible crash in tablesync worker.

  2. Display 'password_required' option for \dRs+ command.

  3. Restart the apply worker if the 'password_required' option is changed.

  4. Fix possible logical replication crash.

  5. Add new predefined role pg_create_subscription.

  6. Expand AclMode to 64 bits

  7. More cleanup of a2ab9c06ea.

  8. Respect permissions within logical replication.

  9. Improve table locking behavior in the face of current DDL.