pam_deny(8)

#%PAM-1.0
#
# If we don't have config entries for a service, the
# OTHER entries are used. To be secure, warn and deny
# access to everything.
other auth     required       pam_warn.so
other auth     required       pam_deny.so
other account  required       pam_warn.so
other account  required       pam_deny.so
other password required       pam_warn.so
other password required       pam_deny.so
other session  required       pam_warn.so
other session  required       pam_deny.so
\n