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upower_observe.go
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upower_observe.go
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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
import (
"strings"
"github.com/snapcore/snapd/interfaces"
"github.com/snapcore/snapd/interfaces/apparmor"
"github.com/snapcore/snapd/interfaces/dbus"
"github.com/snapcore/snapd/interfaces/seccomp"
"github.com/snapcore/snapd/release"
"github.com/snapcore/snapd/snap"
)
const upowerObserveSummary = `allows operating as or reading from the UPower service`
const upowerObserveBaseDeclarationSlots = `
upower-observe:
allow-installation:
slot-snap-type:
- app
- core
deny-connection:
on-classic: false
`
const upowerObservePermanentSlotAppArmor = `
# Description: Allow operating as the UPower service.
network netlink raw,
# DBus accesses
#include <abstractions/dbus-strict>
dbus (send)
bus=system
path=/org/freedesktop/DBus
interface=org.freedesktop.DBus
member={Request,Release}Name
peer=(name=org.freedesktop.DBus),
dbus (receive, send)
bus=system
path=/org/freedesktop/DBus
interface=org.freedesktop.DBus
member="GetConnectionUnix{ProcessID,User}"
peer=(label=unconfined),
# Allow binding the service to the requested connection name
dbus (bind)
bus=system
name="org.freedesktop.UPower",
# Allow read-only access to service properties
dbus (receive)
bus=system
path=/org/freedesktop/login1{,/**}
interface=org.freedesktop.DBus.Properties
peer=(label=unconfined),
# do not use peer=(label=unconfined) here since this is DBus activated
dbus (send)
bus=system
path=/org/freedesktop/login1{,/**}
interface=org.freedesktop.DBus.Properties
member=Get{,All},
# Allow receiving any signals from the logind service
dbus (receive)
bus=system
path=/org/freedesktop/login1{,/**}
interface=org.freedesktop.login1.*
peer=(label=unconfined),
# Allow access to logind service as we need to query it for possible
# power states and trigger these when the battery gets low and the
# system enters a critical state.
dbus (send)
bus=system
path=/org/freedesktop/login1{,/**}
interface=org.freedesktop.login1.Manager
member={CanPowerOff,CanSuspend,CanHibernate,CanHybridSleep,PowerOff,Suspend,Hibernate,HybridSleep}
peer=(label=unconfined),
`
const upowerObserveConnectedSlotAppArmor = `
# Allow traffic to/from our path and interface with any method
dbus (receive, send)
bus=system
path=/org/freedesktop/UPower{,/**}
interface=org.freedesktop.UPower*
peer=(label=###PLUG_SECURITY_TAGS###),
# Allow traffic to/from org.freedesktop.DBus for the UPower service
dbus (receive, send)
bus=system
path=/org/freedesktop/UPower{,/**}
interface=org.freedesktop.DBus.*
peer=(label=###PLUG_SECURITY_TAGS###),
`
const upowerObservePermanentSlotSeccomp = `
# libudev
bind
socket AF_NETLINK - NETLINK_KOBJECT_UEVENT
`
const upowerObservePermanentSlotDBus = `
<!-- DBus policy for upower (based on upstream version 0.99.4) -->
<policy user="root">
<allow own="org.freedesktop.UPower"/>
</policy>
<policy context="default">
<deny own="org.freedesktop.UPower"/>
<allow send_destination="org.freedesktop.UPower"
send_interface="org.freedesktop.DBus.Introspectable"/>
<allow send_destination="org.freedesktop.UPower"
send_interface="org.freedesktop.DBus.Peer"/>
<allow send_destination="org.freedesktop.UPower"
send_interface="org.freedesktop.DBus.Properties"/>
<allow send_destination="org.freedesktop.UPower.Device"
send_interface="org.freedesktop.DBus.Properties"/>
<allow send_destination="org.freedesktop.UPower.KbdBacklight"
send_interface="org.freedesktop.DBus.Properties"/>
<allow send_destination="org.freedesktop.UPower.Wakeups"
send_interface="org.freedesktop.DBus.Properties"/>
<allow send_destination="org.freedesktop.UPower"
send_interface="org.freedesktop.UPower"/>
<allow send_destination="org.freedesktop.UPower"
send_interface="org.freedesktop.UPower.Device"/>
<allow send_destination="org.freedesktop.UPower"
send_interface="org.freedesktop.UPower.KbdBacklight"/>
<allow send_destination="org.freedesktop.UPower"
send_interface="org.freedesktop.UPower.Wakeups"/>
</policy>
`
const upowerObserveConnectedPlugAppArmor = `
# Description: Can query UPower for power devices, history and statistics.
#include <abstractions/dbus-strict>
# Find all devices monitored by UPower
dbus (send)
bus=system
path=/org/freedesktop/UPower
interface=org.freedesktop.UPower
member=EnumerateDevices
peer=(label=###SLOT_SECURITY_TAGS###),
# Read all properties from UPower and devices
# do not use peer=(label=unconfined) here since this is DBus activated
dbus (send)
bus=system
path=/org/freedesktop/UPower{,/Wakeups,/devices/**}
interface=org.freedesktop.DBus.Properties
member=Get{,All},
dbus (send)
bus=system
path=/org/freedesktop/UPower
interface=org.freedesktop.UPower
member=GetCriticalAction
peer=(label=###SLOT_SECURITY_TAGS###),
dbus (send)
bus=system
path=/org/freedesktop/UPower
interface=org.freedesktop.UPower
member=GetDisplayDevice
peer=(label=###SLOT_SECURITY_TAGS###),
dbus (send)
bus=system
path=/org/freedesktop/UPower/devices/**
interface=org.freedesktop.UPower.Device
member=GetHistory
peer=(label=###SLOT_SECURITY_TAGS###),
# Receive property changed events
dbus (receive)
bus=system
path=/org/freedesktop/UPower{,/devices/**}
interface=org.freedesktop.DBus.Properties
member=PropertiesChanged
peer=(label=###SLOT_SECURITY_TAGS###),
# Allow clients to introspect the service
# do not use peer=(label=unconfined) here since this is DBus activated
dbus (send)
bus=system
interface=org.freedesktop.DBus.Introspectable
path=/org/freedesktop/UPower
member=Introspect,
`
type upowerObserveInterface struct{}
func (iface *upowerObserveInterface) Name() string {
return "upower-observe"
}
func (iface *upowerObserveInterface) StaticInfo() interfaces.StaticInfo {
return interfaces.StaticInfo{
Summary: upowerObserveSummary,
ImplicitOnClassic: true,
BaseDeclarationSlots: upowerObserveBaseDeclarationSlots,
}
}
func (iface *upowerObserveInterface) AppArmorConnectedPlug(spec *apparmor.Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
old := "###SLOT_SECURITY_TAGS###"
new := slotAppLabelExpr(slot)
if release.OnClassic {
// Let confined apps access unconfined upower on classic
new = "unconfined"
}
snippet := strings.Replace(upowerObserveConnectedPlugAppArmor, old, new, -1)
spec.AddSnippet(snippet)
return nil
}
func (iface *upowerObserveInterface) AppArmorPermanentSlot(spec *apparmor.Specification, slot *snap.SlotInfo) error {
spec.AddSnippet(upowerObservePermanentSlotAppArmor)
return nil
}
func (iface *upowerObserveInterface) SecCompPermanentSlot(spec *seccomp.Specification, slot *snap.SlotInfo) error {
spec.AddSnippet(upowerObservePermanentSlotSeccomp)
return nil
}
func (iface *upowerObserveInterface) DBusPermanentSlot(spec *dbus.Specification, slot *snap.SlotInfo) error {
spec.AddSnippet(upowerObservePermanentSlotDBus)
return nil
}
func (iface *upowerObserveInterface) AppArmorConnectedSlot(spec *apparmor.Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
old := "###PLUG_SECURITY_TAGS###"
new := plugAppLabelExpr(plug)
snippet := strings.Replace(upowerObserveConnectedSlotAppArmor, old, new, -1)
spec.AddSnippet(snippet)
return nil
}
func (iface *upowerObserveInterface) AutoConnect(*snap.PlugInfo, *snap.SlotInfo) bool {
// allow what declarations allowed
return true
}
func init() {
registerIface(&upowerObserveInterface{})
}