Restricting normal users in login in a linux server

Restricting normal users in login in a linux server

We can restrict normal users to login in server using pam. Pam module pam_nologin.so is used for the purpose. configure the /etc/pam.d/login like as shown below.#%PAM-1.0
auth [user_unknown=ignore success=ok ignore=ignore default=bad] pam_securetty.so
auth include system-auth
auth required pam_nologin.so file=/etc/nologin
#account required pam_nologin.so
account include system-auth
password include system-auth
# pam_selinux.so close should be the first session rule
session required pam_selinux.so close
session optional pam_keyinit.so force revoke
session include system-auth
session required pam_loginuid.so
session optional pam_console.so
# pam_selinux.so open should only be followed by sessions to be executed in the user context
session required pam_selinux.so open
session optional pam_ck_connector.so