auth		required	pam_env.so 
auth		required	pam_unix.so try_first_pass likeauth nullok 
 
account		required	pam_unix.so 
 
password	required	pam_cracklib.so difok=2 minlen=8 dcredit=2 ocredit=2 try_first_pass retry=3 
password	required	pam_unix.so try_first_pass use_authtok nullok md5 shadow 
 
session		required	pam_limits.so 
session		required	pam_env.so 
session		required	pam_unix.so