XScreenSaver and bsdauth

Hi,

I'm trying to make a patch to XScreenSaver to support bsdauth (hopefully
to have it upstream).

So far so good but at one point I'm calling auth_userokay(3) and I
always get the following error:

xscreensaver-auth: /usr/libexec/auth/login_passwd: Permission denied

AFAIU, this call to auth_userokay(3) is done from the
'xscreensaver-auth' executable which was forked from the 'xscreensaver'
executable. I have tried many combination of ownership and setuid bit
on both 'xscreensaver' and 'xscreensaver-auth' but I always end up with
this same error message. Do you have any idea?
--
Manuel Giraud