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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2016 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package builtin
const timeserverControlSummary = `allows setting system time synchronization servers`
const timeserverControlBaseDeclarationSlots = `
timeserver-control:
allow-installation:
slot-snap-type:
- core
deny-auto-connection: true
`
// http://bazaar.launchpad.net/~ubuntu-security/ubuntu-core-security/trunk/view/head:/data/apparmor/policygroups/ubuntu-core/16.04/timeserver-control
const timeserverControlConnectedPlugAppArmor = `
# Description: Can manage timeservers directly separate from config ubuntu-core.
# Can enable system clock NTP synchronization via timedated D-Bus interface,
# Can read all properties of /org/freedesktop/timedate1 D-Bus object; see
# https://www.freedesktop.org/wiki/Software/systemd/timedated/
#include <abstractions/dbus-strict>
# Won't work until LP: #1504657 is fixed. Requires reboot until timesyncd
# notices the change or systemd restarts it.
/etc/systemd/timesyncd.conf rw,
# Introspection of org.freedesktop.timedate1
# do not use peer=(label=unconfined) here since this is DBus activated
dbus (send)
bus=system
path=/org/freedesktop/timedate1
interface=org.freedesktop.DBus.Introspectable
member=Introspect,
dbus (send)
bus=system
path=/org/freedesktop/timedate1
interface=org.freedesktop.timedate1
member="SetNTP"
peer=(label=unconfined),
# Read all properties from timedate1
# do not use peer=(label=unconfined) here since this is DBus activated
dbus (send)
bus=system
path=/org/freedesktop/timedate1
interface=org.freedesktop.DBus.Properties
member=Get{,All},
# Receive timedate1 property changed events
dbus (receive)
bus=system
path=/org/freedesktop/timedate1
interface=org.freedesktop.DBus.Properties
member=PropertiesChanged
peer=(label=unconfined),
# As the core snap ships the timedatectl utility we can also allow
# clients to use it now that they have access to the relevant
# D-Bus method for controlling network time synchronization via
# timedatectl's set-ntp command.
/usr/bin/timedatectl{,.real} ixr,
# Silence this noisy denial. systemd utilities look at /proc/1/environ to see
# if running in a container, but they will fallback gracefully. No other
# interfaces allow this denial, so no problems with silencing it for now. Note
# that allowing this triggers a 'ptrace trace peer=unconfined' denial, which we
# want to avoid.
deny @{PROC}/1/environ r,
`
func init() {
registerIface(&commonInterface{
name: "timeserver-control",
summary: timeserverControlSummary,
implicitOnCore: true,
implicitOnClassic: true,
baseDeclarationSlots: timeserverControlBaseDeclarationSlots,
connectedPlugAppArmor: timeserverControlConnectedPlugAppArmor,
})
}
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