Authenticated user credentials? Single Sign on?

[Jeff Sadowski]

smb.conf
[global]
   security = ads
   realm = SUBDOMAIN.DOMAIN.FOREST
   workgroup = SUBDOMAIN
   idmap config * : backend = tdb
   idmap config * : range = 2000-7999
   idmap config SUBDOMAIN:backend = ad
   idmap config SUBDOMAIN:schema_mode = rfc2307
   idmap config SUBDOMAIN:range = 8000-9999999
   idmap uid = 8000-99999
   idmap gid = 8000-99999
   winbind nss info = rfc2307
   winbind use default domain = yes
   winbind nested groups=yes
   winbind expand groups=10
   winbind enum users = yes
   winbind enum groups = yes


My smb.conf looks as above. When a user logs in is there something I can
use for that user to mount stuff as that user so they do not need to
authenticate again as that user?

I'd like to mount the users home directory as that user?

Single sign on?