[...]
>Using the helper-binary approach has some favours:
>* Works with any PAM-modul, not just pam_unix-type.
>* Installing and keeping up-to-date is much less work. - What if there
> is a security issue with pam_unix, I'll have to find and fix it in
> pam_exim, too and have to install the fixed version.
>* It's the least intrusive, simplest solution.
> cu andreas
>-[...]
>
At best of all, you mess up the pam_unix.o module and suddenly you
cannot log into your machine. You mess up your helper binary and
suddenly, you can't send email...
--josh
http://www.stormbirds.org/authcheck.cxx - my helper binary