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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2022 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 (
"github.com/snapcore/snapd/interfaces"
"github.com/snapcore/snapd/interfaces/apparmor"
apparmor_sandbox "github.com/snapcore/snapd/sandbox/apparmor"
"github.com/snapcore/snapd/strutil"
)
const userNSSummary = `allows the ability to use user namespaces`
// This interface is super-privileged
const userNSBaseDeclarationPlugs = `
userns:
allow-installation: false
deny-auto-connection: true
`
const userNSBaseDeclarationSlots = `
userns:
allow-installation:
slot-snap-type:
- core
deny-auto-connection: true
`
const userNSConnectedPlugAppArmorSupported = `
# Description: allow to use user namespaces
userns,
`
const userNSConnectedPlugSeccomp = `
# allow the use of clone and unshare to use new user namespaces
clone
unshare
`
type userNSInterface struct {
commonInterface
}
func (iface *userNSInterface) Name() string {
return "userns"
}
func (iface *userNSInterface) userNSAppArmorSupported() (bool, error) {
if apparmor_sandbox.ProbedLevel() == apparmor_sandbox.Unsupported {
// AppArmor is not supported at all; no need to add rules
return false, nil
}
features, err := apparmor_sandbox.ParserFeatures()
if err != nil {
return false, err
}
if !strutil.ListContains(features, "userns") {
return false, nil
}
return true, nil
}
func (iface *userNSInterface) AppArmorConnectedPlug(spec *apparmor.Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
supported, err := iface.userNSAppArmorSupported()
if err != nil {
return err
}
if supported {
spec.AddSnippet(userNSConnectedPlugAppArmorSupported)
}
return nil
}
func init() {
registerIface(&userNSInterface{commonInterface: commonInterface{
name: "userns",
summary: userNSSummary,
implicitOnCore: true,
implicitOnClassic: true,
baseDeclarationPlugs: userNSBaseDeclarationPlugs,
baseDeclarationSlots: userNSBaseDeclarationSlots,
connectedPlugSecComp: userNSConnectedPlugSeccomp,
}})
}
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