Re: [exim] Sourcing Exim Filter from MySQL/MariaDB table?

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Autor: Phil Pennock
Data:  
A: Mike Tubby
CC: exim-users
Assumpte: Re: [exim] Sourcing Exim Filter from MySQL/MariaDB table?
On 2019-05-08 at 00:39 +0100, Mike Tubby via Exim-users wrote:
> Which suggests I need something like:
>
> user_filter:
>     driver = forwardfile
>     data = ${lookup mysql{SELECT rule FROM users LEFT JOIN domains \
>         ON domains.id=users.domain_id LEFT JOIN filters \
>         ON users.id=filters.user_id WHERE
> domains.domain='${quote_mysql:$domain}' \
>         AND users.username='${quote_mysql:$local_part}' \
>         AND domains.active=1 \
>         AND users.active=1 \
>         AND filters.active=1}}
>     no_verify
>     no_expn
>     check_ancestor


This is a central mailhub where users no longer have accounts. Please
read the Exim Spec security section on "Running Local Commands":

https://www.exim.org/exim-html-current/doc/html/spec_html/ch-security_considerations.html#SECTsecconslocalcmds

You're going to need to add a bunch of forbid_* options to that Router,
and keep an eye on release notes when upgrading, to watch for shiny new
forbid_* options.

See:

https://www.exim.org/exim-html-current/doc/html/spec_html/ch-the_redirect_router.html#SECID130

for the list of options, search for "forbid_" (and "allow_").

> Am I going to need to arrange for the database result set to start with '#
> Exim Filter' each time or is their a boolean to force this?


If it worked before, it'll work now; if I were choosing, I would leave
it to the users to choose an Exim filter, a Sieve filter, or just a
simple forward rule.

-Phil