auth       required     /lib/security/pam_listfile.so item=user sense=deny file=/etc/ftpusers onerr=succeed
auth       required     /lib/security/pam_unix.so
auth       required     /lib/security/pam_shells.so
account    required     /lib/security/pam_unix.so
session    required     /lib/security/pam_unix.so
password   sufficient   /lib/security/pam_unix.so

# If authentication doesn't work for you, try to add 'shadow' (without quotes)
# after pam_unix.so                                  - suggested by Joe Silva.
# If it still doesn't work for you, you can also try to add "md5" after
# "pam_unix.so"