Re: Relaxing SSL key permission checks

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Christoph Berg <myon(at)debian(dot)org>
Cc: PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Relaxing SSL key permission checks
Date: 2016-02-18 15:17:49
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Christoph Berg <myon(at)debian(dot)org> writes:
> Currently the server insists on ssl_key_file's permissions to be 0600
> or less, and be owned by the database user. Debian has been patching
> be-secure.c since forever (the git history goes back to 8.2beta1) to
> relax that to 0640 or less, and owned by root or the database user.

Debian can do that if they like, but it's entirely unacceptable as an
across-the-board patch. Not all systems treat groups as being narrow
domains in which it's okay to assume that group-readable files are
secure enough to be keys. As an example, on OS X user files tend to be
group "staff" or "admin" which'd be close enough to world readable.

We could allow group-readable if we had some way to know whether to
trust the specific group, but I don't think there's any practical
way to do that. System conventions vary too much.

regards, tom lane

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