This file is indexed.

/etc/apparmor.d/abstractions/authentication is in apparmor 2.12-4ubuntu5.

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,

  /{usr/,}lib{,32,64}/security/pam_filter/*  mr,
  /{usr/,}lib{,32,64}/security/pam_*.so      mr,
  /{usr/,}lib{,32,64}/security/              r,
  /{usr/,}lib/@{multiarch}/security/pam_filter/*  mr,
  /{usr/,}lib/@{multiarch}/security/pam_*.so      mr,
  /{usr/,}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>