From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Heikki Linnakangas <hlinnaka(at)iki(dot)fi> |
Cc: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Jelte Fennema-Nio <postgres(at)jeltef(dot)nl>, Daniel Gustafsson <daniel(at)yesql(dot)se>, Bruce Momjian <bruce(at)momjian(dot)us>, Joel Jacobson <joel(at)compiler(dot)org>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Gabriele Bartolini <gabriele(dot)bartolini(at)enterprisedb(dot)com>, Magnus Hagander <magnus(dot)hagander(at)redpill-linpro(dot)com>, Maciek Sakrejda <m(dot)sakrejda(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com> |
Subject: | Re: Possibility to disable `ALTER SYSTEM` |
Date: | 2024-03-19 14:51:50 |
Message-ID: | 3868891.1710859910@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Heikki Linnakangas <hlinnaka(at)iki(dot)fi> writes:
> Perhaps we could make that even better with a GUC though. I propose a
> GUC called 'configuration_managed_externally = true / false". If you set
> it to true, we prevent ALTER SYSTEM and make the error message more
> definitive:
> postgres=# ALTER SYSTEM SET wal_level TO minimal;
> ERROR: configuration is managed externally
> As a bonus, if that GUC is set, we could even check at server startup
> that all the configuration files are not writable by the postgres user,
> and print a warning or refuse to start up if they are.
I like this idea. The "bonus" is not optional though, because
setting the files' ownership/permissions is the only way to be
sure that the prohibition is even a little bit bulletproof.
One small issue: how do we make that work on Windows? Have recent
versions grown anything that looks like real file permissions?
Another question is whether this should be one-size-fits-all for
all the configuration files. I can imagine situations where
you'd like to lock down postgresql[.auto].conf but not pg_hba.conf.
But maybe that can wait for somebody to show up with a use-case.
regards, tom lane
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