pam_unix.so options

[Zach]

Hi,

I posted this question a while back, but didn't get much response.

Can anyone point me to documentation on the options to pam_unix.so? 
Specifically, I'm looking for details on the "obscure" option as well
as the "min" and "max" options, both of which are used in Ubuntu's
pam.d passwd config file.

I've checked the pam system administrator's guide,
http://www.kernel.org/pub/linux/libs/pam/Linux-PAM-html/pam.html,
which is dated 2002, and these options are not documented there.  Also
there does not appear to be a man page for pam_unix.so.  I've checked
the Linux Documentation Project, and while there is a howto on user
authentication, it doesn't go into the various options to this module.

Thanks
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