user-based query white list

Looking for a way to limited a user to a specific set of queries. I don't think
this can be done right now ... or can it? Has this feature request surfaced in
the past?

I currently need this as an extra security measure for a libpq client app (want
to block arbitrary queries from malicious attackers). The easiest way I found
was to add some query_string checks into backend/tcop/postgres.c for the 'Q' and
'P' commands in PostgresMain(). Seems to work just fine. If it doesn't match,
I issue an ereport FATAL since that is seen as a "malicious query execution
attempt".

I think it is something rather simple to design/implement (probably use a table
of user allowed queries, support regex matches, etc.. loaded at session startup
and SIGHUP).

--
Andrew Chernow
eSilo, LLC
every bit counts
http://www.esilo.com/