/etc/apparmor.d/abstractions/authentication is in apparmor 2.7.102-0ubuntu3.11.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (C) 2002-2009 Novell/SUSE
# Copyright (C) 2009-2012 Canonical Ltd
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of version 2 of the GNU General Public
# License published by the Free Software Foundation.
#
# ------------------------------------------------------------------
# Some services need to perform authentication of users
# Such authentication almost certainly needs access to the local users
# databases containing passwords, PAM configuration files, PAM libraries
/etc/nologin r,
/etc/pam.d/* r,
/etc/securetty r,
/etc/security/* r,
/etc/shadow r,
/etc/gshadow r,
/etc/pwdb.conf r,
/lib{,32,64}/security/pam_filter/* mr,
/lib{,32,64}/security/pam_*.so mr,
/lib{,32,64}/security/ r,
/lib/@{multiarch}/security/pam_filter/* mr,
/lib/@{multiarch}/security/pam_*.so mr,
/lib/@{multiarch}/security/ r,
# kerberos
#include <abstractions/kerberosclient>
# SuSE's pwdutils are different:
/etc/default/passwd r,
/etc/login.defs r,
# nis
#include <abstractions/nis>
# winbind
#include <abstractions/winbind>
# likewise
#include <abstractions/likewise>
# smbpass
#include <abstractions/smbpass>
# p11-kit (PKCS#11 modules configuration)
#include <abstractions/p11-kit>
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