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media_hub.go
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media_hub.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2017 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/seccomp"
"github.com/snapcore/snapd/snap"
)
const mediaHubSummary = `allows operating as the media-hub service`
const mediaHubBaseDeclarationSlots = `
media-hub:
allow-installation:
slot-snap-type:
- app
- core
deny-connection:
on-classic: false
`
const mediaHubPermanentSlotAppArmor = `
# Description: Allow operating as the media-hub service.
# DBus accesses
#include <abstractions/dbus-session-strict>
dbus (send)
bus=session
path=/org/freedesktop/DBus
interface=org.freedesktop.DBus
member="{Request,Release}Name"
peer=(name=org.freedesktop.DBus, label=unconfined),
# Allow querying AppArmor
dbus (send)
bus=session
path=/org/freedesktop/DBus
interface=org.freedesktop.DBus
member="GetConnectionAppArmorSecurityContext"
peer=(name=org.freedesktop.DBus, label=unconfined),
# Allow binding the service to the requested connection name
dbus (bind)
bus=session
name="core.ubuntu.media.Service",
# Allow communications with unconfined processes
dbus (receive, send)
bus=session
path=/com/ubuntu/media/Service{,/**}
interface=org.freedesktop.DBus{,.*}
peer=(label=unconfined),
# Allow unconfined processes to introspect us
dbus (receive)
bus=session
interface=org.freedesktop.DBus.Introspectable
peer=(label=unconfined),
dbus (receive, send)
bus=session
path=/core/ubuntu/media/Service{,/**}
peer=(label=unconfined),
# Allow sending/receiving mpris signals for session path
dbus (receive, send)
bus=session
path=/core/ubuntu/media/Service/sessions/**
interface="org.mpris.MediaPlayer2{,.Player,.TrackList}"
peer=(label=unconfined),
# Allow sending properties signals for session path
dbus (send)
bus=session
path=/core/ubuntu/media/Service/sessions/**
interface="org.freedesktop.DBus.Properties"
peer=(label=unconfined),
`
const mediaHubConnectedSlotAppArmor = `
# Allow clients to query/modify and get notified of service properties
dbus (receive, send)
bus=session
interface=org.freedesktop.DBus.Properties
path=/core/ubuntu/media/Service{,/**}
peer=(label=###PLUG_SECURITY_TAGS###),
# Allow client to introspect our DBus api
dbus (receive)
bus=session
interface=org.freedesktop.DBus.Introspectable
path=/core/ubuntu/media/Service
member="Introspect"
peer=(label=###PLUG_SECURITY_TAGS###),
# Allow clients to manage Player sessions
dbus (receive)
bus=session
interface="core.ubuntu.media.Service{,.*}"
path=/core/ubuntu/media/Service
peer=(label=###PLUG_SECURITY_TAGS###),
`
const mediaHubConnectedPlugAppArmor = `
# Description: Allow using media-hub service.
#include <abstractions/dbus-session-strict>
# Allow clients to query/modify and get notified of service properties
dbus (receive, send)
bus=session
interface=org.freedesktop.DBus.Properties
path=/core/ubuntu/media/Service{,/**}
peer=(label=###SLOT_SECURITY_TAGS###),
# Allow client to introspect our DBus api
dbus (send)
bus=session
interface=org.freedesktop.DBus.Introspectable
path=/core/ubuntu/media/Service
member="Introspect"
peer=(label=###SLOT_SECURITY_TAGS###),
# Allow clients to manage Player sessions
dbus (send)
bus=session
interface="core.ubuntu.media.Service{,.*}"
path=/core/ubuntu/media/Service
peer=(label=###SLOT_SECURITY_TAGS###),
`
const mediaHubPermanentSlotSecComp = `
# Description: Allow operating as the media-hub service.
bind
`
type mediaHubInterface struct{}
func (iface *mediaHubInterface) Name() string {
return "media-hub"
}
func (iface *mediaHubInterface) StaticInfo() interfaces.StaticInfo {
return interfaces.StaticInfo{
Summary: mediaHubSummary,
BaseDeclarationSlots: mediaHubBaseDeclarationSlots,
}
}
func (iface *mediaHubInterface) AppArmorConnectedPlug(spec *apparmor.Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
old := "###SLOT_SECURITY_TAGS###"
new := slotAppLabelExpr(slot)
spec.AddSnippet(strings.Replace(mediaHubConnectedPlugAppArmor, old, new, -1))
return nil
}
func (iface *mediaHubInterface) AppArmorPermanentSlot(spec *apparmor.Specification, slot *snap.SlotInfo) error {
spec.AddSnippet(mediaHubPermanentSlotAppArmor)
return nil
}
func (iface *mediaHubInterface) AppArmorConnectedSlot(spec *apparmor.Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
old := "###PLUG_SECURITY_TAGS###"
new := plugAppLabelExpr(plug)
spec.AddSnippet(strings.Replace(mediaHubConnectedSlotAppArmor, old, new, -1))
return nil
}
func (iface *mediaHubInterface) SecCompPermanentSlot(spec *seccomp.Specification, slot *snap.SlotInfo) error {
spec.AddSnippet(mediaHubPermanentSlotSecComp)
return nil
}
func (iface *mediaHubInterface) AutoConnect(*snap.PlugInfo, *snap.SlotInfo) bool {
// allow what declarations allowed
return true
}
func init() {
registerIface(&mediaHubInterface{})
}