/etc/apparmor.d/abstractions/nameservice is in apparmor 2.10.95-0ubuntu2.
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) 2009-2011 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.
#
# ------------------------------------------------------------------
# Many programs wish to perform nameservice-like operations, such as
# looking up users by name or id, groups by name or id, hosts by name
# or IP, etc. These operations may be performed through files, dns,
# NIS, NIS+, LDAP, hesiod, wins, etc. Allow them all here.
/etc/group r,
/etc/host.conf r,
/etc/hosts r,
/etc/nsswitch.conf r,
/etc/gai.conf r,
/etc/passwd r,
/etc/protocols r,
# When using libnss-extrausers, the passwd and group files are merged from
# an alternate path
/var/lib/extrausers/group r,
/var/lib/extrausers/passwd r,
# When using sssd, the passwd and group files are stored in an alternate path
# and the nss plugin also needs to talk to a pipe
/var/lib/sss/mc/group r,
/var/lib/sss/mc/passwd r,
/var/lib/sss/pipes/nss rw,
/etc/resolv.conf r,
# on systems using resolvconf, /etc/resolv.conf is a symlink to
# /{,var/}run/resolvconf/resolv.conf and a file sometimes referenced in
# /etc/resolvconf/run/resolv.conf. Similarly, if NetworkManager is used
# without resolvconf, /etc/resolv.conf is a symlink to its own resolv.conf.
# Finally, on systems using systemd's networkd, /etc/resolv.conf is
# a symlink to /run/systemd/resolve/resolv.conf
/{,var/}run/{resolvconf,NetworkManager,systemd/resolve}/resolv.conf r,
/etc/resolvconf/run/resolv.conf r,
/etc/samba/lmhosts r,
/etc/services r,
# db backend
/var/lib/misc/*.db r,
# The Name Service Cache Daemon can cache lookups, sometimes leading
# to vast speed increases when working with network-based lookups.
/{,var/}run/.nscd_socket rw,
/{,var/}run/nscd/socket rw,
/{var/db,var/cache,var/run,run}/nscd/{passwd,group,services,hosts} r,
# nscd renames and unlinks files in it's operation that clients will
# have open
/{,var/}run/nscd/db* rmix,
# The nss libraries are sometimes used in addition to PAM; make sure
# they are available
/lib{,32,64}/libnss_*.so* mr,
/usr/lib{,32,64}/libnss_*.so* mr,
/lib/@{multiarch}/libnss_*.so* mr,
/usr/lib/@{multiarch}/libnss_*.so* mr,
/etc/default/nss r,
# avahi-daemon is used for mdns4 resolution
/{,var/}run/avahi-daemon/socket rw,
# libnl-3-200 via libnss-gw-name
@{PROC}/@{pid}/net/psched r,
/etc/libnl-*/classid r,
# nis
#include <abstractions/nis>
# ldap
#include <abstractions/ldapclient>
# winbind
#include <abstractions/winbind>
# likewise
#include <abstractions/likewise>
# mdnsd
#include <abstractions/mdns>
# kerberos
#include <abstractions/kerberosclient>
# TCP/UDP network access
network inet stream,
network inet6 stream,
network inet dgram,
network inet6 dgram,
# TODO: adjust when support finer-grained netlink rules
# Netlink raw needed for nscd
network netlink raw,
# interface details
@{PROC}/@{pid}/net/route r,
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