From: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Magnus Hagander <mha(at)sollentuna(dot)net>, Andreas Pflug <pgadmin(at)pse-consulting(dot)de>, Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, Dave Page <dpage(at)vale-housing(dot)co(dot)uk>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: For review: Server instrumentation patch |
Date: | 2005-07-24 22:33:28 |
Message-ID: | 42E41738.80207@dunslane.net |
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Lists: | pgsql-hackers |
Tom Lane wrote:
>Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
>
>
>>It could be argued that there should be provision for a limitation on
>>the locations in which COPY can write (and maybe read) files.
>>If COPY is a security hole then we should close it, not use that as
>>precedent to open another hole.
>>
>>
>
>Yeah. It's worth pointing out in this connection that server-side
>COPY is already pretty well crippled if you are running under SELinux,
>because the security policy constrains what parts of the filesystem
>the daemon can reach at all. I've already been thinking seriously
>of proposing that the regression tests be converted to use only
>\copy and not COPY, because it's difficult to run them against an
>installed server on Fedora 4, and it may be impossible in the near
>future.
>
>
>
>
That also occurred to me. I have taken to turning off SELinux altogether
but some day I'm going to have to stop that.
How about if we do something like this?:
. initdb creates a tmpdir inside the datadir
. a new GUC var called allowed_copy_locations which is a PATH type
string specifying what directories we can copy to/from. This would by
default be "$tmpdir"
. in addition to an absolute path, a copy path could begin with $tmpdir
. explicitly setting the GUC to "*" would allow any absolute location as
now (having this not the default means admins would have to turn it on
deliberately, which would be a Good Thing (tm)).
possible extra:
. another GUC var to specify an alternative location for $tmpdir.
cheers
andrew
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