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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 maliitSummary = `allows operating as the Maliit service`
const maliitBaseDeclarationSlots = `
maliit:
allow-installation:
slot-snap-type:
- app
deny-connection: true
deny-auto-connection: true
`
const maliitPermanentSlotAppArmor = `
# Description: Allow operating as a maliit server.
# Communication with maliit happens in the following stages:
# * An application connects to the address service: org.maliit.Server.Address.
# * The server responds with a private unix socket of the form
# @/tmp/maliit-server/dbus-* on which the server is running a peer-to-peer
# dbus session.
# * All further communication happens over this channel
# * An application wishing to receive input then requests that it be made the
# active context.
# * At this point maliit retrieves the application's PID based on the dbus
# channel and verifies with Unity 8 that the application is currently
# focused.
# TODO: In the future this will be based on surface ID instead of PID
# * Only if the application is focused is it then able to receive input from
# the on-screen keyboard.
# DBus accesses
#include <abstractions/dbus-session-strict>
# Allow binding to the well-known maliit DBus service name for address
# negotiation
dbus (bind)
bus=session
name="org.maliit.server",
# TODO: should this be somewhere else?
/usr/share/glib-2.0/schemas/ r,
# maliit uses peer-to-peer dbus over a unix socket after address negotiation.
# Each application has its own one-to-one communication channel with the maliit
# server, over which all further communication happens. Send and receive rules
# are in the per-snap connection policy.
unix (bind, listen, accept) type=stream addr="@/tmp/maliit-server/dbus-*",
`
const maliitConnectedSlotAppArmor = `
# Provides the maliit address service which assigns an individual unix socket
# to each application
dbus (receive)
bus=session
interface="org.maliit.Server.Address"
path=/org/maliit/server/address
peer=(label=###PLUG_SECURITY_TAGS###),
dbus (receive)
bus=session
path=/org/maliit/server/address
interface=org.freedesktop.DBus.Properties
peer=(label=###PLUG_SECURITY_TAGS###),
# Provide access to the peer-to-peer dbus socket assigned by the address service
unix (receive, send) type=stream addr="@/tmp/maliit-server/dbus-*" peer=(label=###PLUG_SECURITY_TAGS###),
`
const maliitConnectedPlugAppArmor = `
# Description: Allow applications to connect to a maliit socket
#include <abstractions/dbus-session-strict>
# Allow applications to communicate with the maliit address service
# which assigns an individual unix socket for all further communication
# to happen over.
dbus (send)
bus=session
interface="org.maliit.Server.Address"
path=/org/maliit/server/address
peer=(label=###SLOT_SECURITY_TAGS###),
dbus (send)
bus=session
path=/org/maliit/server/address
interface=org.freedesktop.DBus.Properties
peer=(label=###SLOT_SECURITY_TAGS###),
# Provide access to the peer-to-peer dbus socket assigned by the address service
unix (send, receive, connect) type=stream addr=none peer=(label=###SLOT_SECURITY_TAGS###, addr="@/tmp/maliit-server/dbus-*"),
`
const maliitPermanentSlotSecComp = `
listen
accept
accept4
`
type maliitInterface struct{}
func (iface *maliitInterface) Name() string {
return "maliit"
}
func (iface *maliitInterface) StaticInfo() interfaces.StaticInfo {
return interfaces.StaticInfo{
Summary: maliitSummary,
BaseDeclarationSlots: maliitBaseDeclarationSlots,
}
}
func (iface *maliitInterface) AppArmorConnectedPlug(spec *apparmor.Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
old := "###SLOT_SECURITY_TAGS###"
new := slotAppLabelExpr(slot)
snippet := strings.Replace(maliitConnectedPlugAppArmor, old, new, -1)
spec.AddSnippet(snippet)
return nil
}
func (iface *maliitInterface) SecCompPermanentSlot(spec *seccomp.Specification, slot *snap.SlotInfo) error {
spec.AddSnippet(maliitPermanentSlotSecComp)
return nil
}
func (iface *maliitInterface) AppArmorPermanentSlot(spec *apparmor.Specification, slot *snap.SlotInfo) error {
spec.AddSnippet(maliitPermanentSlotAppArmor)
return nil
}
func (iface *maliitInterface) AppArmorConnectedSlot(spec *apparmor.Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
old := "###PLUG_SECURITY_TAGS###"
new := plugAppLabelExpr(plug)
snippet := strings.Replace(maliitConnectedSlotAppArmor, old, new, -1)
spec.AddSnippet(snippet)
return nil
}
func (iface *maliitInterface) AutoConnect(*snap.PlugInfo, *snap.SlotInfo) bool {
// allow what declarations allowed
return true
}
func init() {
registerIface(&maliitInterface{})
}
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