[patch] Add setuid helper

[Richard Hughes]

On Mon, 2007-06-18 at 11:04 -0400, Havoc Pennington wrote:
>   - it is not necessary to use an underscore prefix on static functions

OOps.

>   - I think there may be a STARTER_BUS_TYPE that goes with
>     STARTER_BUS_ADDRESS (?)

Yup, I'll add that.

>   - we are kind of randomly mixing dbus wrappers (_dbus_getenv(), etc.)
>     with direct API usage (clearenv(), etc.)

Yes, sucky.

>     The dbus wrappers have two supposed purposes:
>     - abstraction of any portability issues
>     - the "vsftpd" security rationale which may be in HACKING or
>       somewhere; to safety-ize APIs by making them use DBusString
>       for example, and to generally be able to audit all use of
>       system libs
> 
>     Portability issues are minimal here since we are only worried about
>     unix, but there may be some small ones perhaps.
> 
>     I'm not sure what to do in this context, on one level it is easier
>     to audit the suid helper if it has no dependencies at all (no
>     wrappers), but that isn't achievable since it's using all the
>     dbus infrastructure (parsers, DBusString, etc.), so maybe we should
>     go ahead and do things the full "dbus way" and use only wrappers.

Yes, I'll add a wrapper to do this "the dbus way".

Richard.