/usr/share/doc/libpam-alreadyloggedin/examples/login.sso is in libpam-alreadyloggedin 0.3-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | #%PAM-1.0
#
# /etc/pam.d/login.sso -- part of pam_alreadyloggedin package.
#
# Based on the /etc/pam.d/login taken from ALT Linux Master 2.2
#
# Put line calling pam_already_loggedin.so
# from here to original /etc/pam.d/login file,
# or simply rename `login' file to `login.orig' and this file to `login'.
#
#---------------------------------------------------------------
auth required /lib/security/pam_securetty.so
auth sufficient /lib/security/pam_alreadyloggedin.so debug no_root restrict_tty=/dev/tty[1-6] restrict_loggedin_tty=/dev/tty[1-6]
auth required /lib/security/pam_stack.so service=system-auth
auth required /lib/security/pam_nologin.so
auth optional /lib/security/pam_mail.so
account required /lib/security/pam_stack.so service=system-auth
password required /lib/security/pam_stack.so service=system-auth
session required /lib/security/pam_stack.so service=system-auth
session optional /lib/security/pam_lastlog.so nowtmp
session optional /lib/security/pam_motd.so
session optional /lib/security/pam_console.so
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