/etc/apparmor.d/usr.sbin.ntpd is in ntp 1:4.2.6.p5+dfsg-3ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Updated for Ubuntu by: Jamie Strandboge <jamie@canonical.com>
# ------------------------------------------------------------------
#
# Copyright (C) 2002-2005 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.
#
# ------------------------------------------------------------------
#include <tunables/global>
#include <tunables/ntpd>
/usr/sbin/ntpd {
#include <abstractions/base>
#include <abstractions/nameservice>
#include <abstractions/user-tmp>
capability ipc_lock,
capability net_bind_service,
capability setgid,
capability setuid,
capability sys_chroot,
capability sys_resource,
capability sys_time,
capability sys_nice,
network inet dgram,
network inet6 dgram,
network inet stream,
network inet6 stream,
@{PROC}/net/if_inet6 r,
@{PROC}/*/net/if_inet6 r,
@{NTPD_DEVICE} rw,
/{,s}bin/ r,
/usr/{,s}bin/ r,
/usr/sbin/ntpd rmix,
/etc/ntp.conf r,
/etc/ntp.conf.dhcp r,
/etc/ntpd.conf r,
/etc/ntpd.conf.tmp r,
/var/lib/ntp/ntp.conf.dhcp r,
/etc/ntp.keys r,
/etc/ntp/** r,
/etc/ntp.drift rwl,
/etc/ntp.drift.TEMP rwl,
/etc/ntp/drift* rwl,
/var/lib/ntp/*drift rw,
/var/lib/ntp/*drift.TEMP rw,
/var/log/ntp w,
/var/log/ntp.log w,
/var/log/ntpd w,
/var/log/ntpstats/clockstats* rwl,
/var/log/ntpstats/loopstats* rwl,
/var/log/ntpstats/peerstats* rwl,
/var/log/ntpstats/protostats* rwl,
/var/log/ntpstats/rawstats* rwl,
/var/log/ntpstats/sysstats* rwl,
/{,var/}run/ntpd.pid w,
# samba4 ntp signing socket
/{,var/}run/samba/ntp_signd/socket rw,
# For use with clocks that report via shared memory (e.g. gpsd),
# you may need to give ntpd access to all of shared memory, though
# this can be considered dangerous. See https://launchpad.net/bugs/722815
# for details. To enable, add this to local/usr.sbin.ntpd:
# capability ipc_owner,
# Site-specific additions and overrides. See local/README for details.
#include <local/usr.sbin.ntpd>
}
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