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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2018 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 (
"fmt"
"os"
"strings"
"github.com/snapcore/snapd/interfaces"
"github.com/snapcore/snapd/interfaces/apparmor"
apparmor_sandbox "github.com/snapcore/snapd/sandbox/apparmor"
)
const daemonNotifySummary = `allows sending daemon status changes to service manager`
const daemonNotifyBaseDeclarationSlots = `
daemon-notify:
allow-installation:
slot-snap-type:
- core
deny-auto-connection: true
`
const daemonNotifyConnectedPlugAppArmorTemplate = `
# Allow sending notification messages to systemd through the notify socket
{{notify-socket-rule}},
# Allow using systemd-notify in shell scripts.
/{,usr/}bin/systemd-notify ixr,
`
type daemoNotifyInterface struct {
commonInterface
}
var osGetenv = os.Getenv
func (iface *daemoNotifyInterface) AppArmorConnectedPlug(spec *apparmor.Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
// If the system has defined it, use NOTIFY_SOCKET from the environment. Note
// this is safe because it is examined on snapd start and snaps cannot manipulate
// the environment of snapd.
notifySocket := osGetenv("NOTIFY_SOCKET")
if notifySocket == "" {
notifySocket = "/run/systemd/notify"
}
if !strings.HasPrefix(notifySocket, "/") && !strings.HasPrefix(notifySocket, "@") {
// must be an absolute path or an abstract socket path
return fmt.Errorf("cannot use %q as notify socket path: not absolute", notifySocket)
}
if err := apparmor_sandbox.ValidateNoAppArmorRegexp(notifySocket); err != nil {
return fmt.Errorf("cannot use %q as notify socket path: %s", notifySocket, err)
}
var rule string
switch {
case strings.HasPrefix(notifySocket, "/"):
rule = fmt.Sprintf(`"%s" w`, notifySocket)
case strings.HasPrefix(notifySocket, "@/org/freedesktop/systemd1/notify/"):
// special case for Ubuntu 14.04 where the manpage states that
// /run/systemd/notify is used, but in fact the services get an
// abstract socket path such as
// @/org/freedesktop/systemd1/notify/13334051644891137417, the
// last part changing with each reboot
rule = `unix (connect, send) type=dgram peer=(label=unconfined,addr="@/org/freedesktop/systemd1/notify/[0-9]*")`
case strings.HasPrefix(notifySocket, "@"):
rule = fmt.Sprintf(`unix (connect, send) type=dgram peer=(label=unconfined,addr="%s")`, notifySocket)
default:
return fmt.Errorf("cannot use %q as notify socket path", notifySocket)
}
snippet := strings.Replace(daemonNotifyConnectedPlugAppArmorTemplate,
"{{notify-socket-rule}}", rule, 1)
spec.AddSnippet(snippet)
return nil
}
func init() {
registerIface(&daemoNotifyInterface{commonInterface: commonInterface{
name: "daemon-notify",
summary: daemonNotifySummary,
implicitOnCore: true,
implicitOnClassic: true,
baseDeclarationSlots: daemonNotifyBaseDeclarationSlots,
}})
}
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