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classic_support.go
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classic_support.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
const classicSupportSummary = `special permissions for the classic snap`
const classicSupportBaseDeclarationPlugs = `
classic-support:
allow-installation: false
deny-auto-connection: true
`
const classicSupportBaseDeclarationSlots = `
classic-support:
allow-installation:
slot-snap-type:
- core
deny-auto-connection: true
`
const classicSupportPlugAppArmor = `
# Description: permissions to use classic dimension. This policy is
# intentionally not restricted. This gives device ownership to
# connected snaps.
# Description: permissions to use classic dimension. This policy is intentionally
# not restricted. This gives device ownership to connected snaps.
# for 'create'
/{,usr/}bin/unsquashfs ixr,
/var/lib/snapd/snaps/core_*.snap r,
capability chown,
capability fowner,
capability mknod,
# This allows running anything unconfined
/{,usr/}bin/sudo Uxr,
capability fsetid,
capability dac_override,
# Allow copying configuration to the chroot
/etc/{,**} r,
/var/lib/extrausers/{,*} r,
# Allow bind mounting various directories
capability sys_admin,
/{,usr/}bin/mount ixr,
/{,usr/}bin/mountpoint ixr,
/run/mount/utab rw,
@{PROC}/[0-9]*/mountinfo r,
# parallel-installs: SNAP_{DATA,COMMON} are remapped, need to use SNAP_NAME, for
# completeness allow SNAP_INSTANCE_NAME too
mount options=(rw bind) /home/ -> /var/snap/{@{SNAP_NAME},@{SNAP_INSTANCE_NAME}}/**/,
mount options=(rw bind) /run/ -> /var/snap/{@{SNAP_NAME},@{SNAP_INSTANCE_NAME}}/**/,
mount options=(rw bind) /proc/ -> /var/snap/{@{SNAP_NAME},@{SNAP_INSTANCE_NAME}}/**/,
mount options=(rw bind) /sys/ -> /var/snap/{@{SNAP_NAME},@{SNAP_INSTANCE_NAME}}/**/,
mount options=(rw bind) /dev/ -> /var/snap/{@{SNAP_NAME},@{SNAP_INSTANCE_NAME}}/**/,
mount options=(rw bind) / -> /var/snap/{@{SNAP_NAME},@{SNAP_INSTANCE_NAME}}/**/,
mount fstype=devpts options=(rw) devpts -> /dev/pts/,
mount options=(rw rprivate) -> /var/snap/{@{SNAP_NAME},@{SNAP_INSTANCE_NAME}}/**/,
# reset
/{,usr/}bin/umount ixr,
umount /var/snap/{@{SNAP_NAME},@{SNAP_INSTANCE_NAME}}/**/,
# These rules allow running anything unconfined as well as managing systemd
/usr/bin/systemd-run Uxr,
/bin/systemctl Uxr,
`
const classicSupportPlugSecComp = `
# Description: permissions to use classic dimension. This policy is intentionally
# not restricted. This gives device ownership to connected snaps.
# create
chown
chown32
lchown
lchown32
fchown
fchown32
fchownat
mknod
chroot
# sudo
bind
sendmsg
sendmmsg
sendto
recvfrom
recvmsg
setgroups
setgroups32
# classic
mount
getsockopt
# reset
umount
umount2
`
func init() {
registerIface(&commonInterface{
name: "classic-support",
summary: classicSupportSummary,
implicitOnCore: true,
implicitOnClassic: true,
baseDeclarationPlugs: classicSupportBaseDeclarationPlugs,
baseDeclarationSlots: classicSupportBaseDeclarationSlots,
connectedPlugAppArmor: classicSupportPlugAppArmor,
connectedPlugSecComp: classicSupportPlugSecComp,
})
}