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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2021 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 dmCryptSummary = `allows encryption and decryption of block storage devices`
const dmCryptBaseDeclarationSlots = `
dm-crypt:
allow-installation:
slot-snap-type:
- core
deny-auto-connection: true
`
const dmCryptBaseDeclarationPlugs = `
dm-crypt:
allow-installation: false
deny-auto-connection: true
`
// XXX: this should not hardcode mount points like /run/media/ but unless we
// have an interface like "mount-control" this is needed
const dmCryptConnectedPlugAppArmor = `
# Allow mapper access
/dev/mapper/control rw,
/dev/dm-[0-9]* rwk,
# allow use of cryptsetup from core snap
/{,usr/}sbin/cryptsetup ixr,
# Mount points could be in /run/media/<user>/* or /media/<user>/*
/run/systemd/seats/* r,
/{,run/}media/{,**} rw,
mount options=(ro,nosuid,nodev) /dev/dm-[0-9]* -> /{,run/}media/**,
mount options=(rw,nosuid,nodev) /dev/dm-[0-9]* -> /{,run/}media/**,
# exec mount/umount to do the actual operations
/{,usr/}bin/mount ixr,
/{,usr/}bin/umount ixr,
# mount/umount (via libmount) track some mount info in these files
/{,var/}run/mount/utab* wrlk,
# Allow access to the file locking mechanism
/{,var/}run/cryptsetup/ rw,
/{,var/}run/cryptsetup/* rwk,
/{,var/}run/ r,
`
const dmCryptConnectedPlugSecComp = `
# Description: Allow kernel keyring manipulation
add_key
keyctl
request_key
`
// dm-crypt
// Note that often dm-crypt is statically linked into the kernel (CONFIG_DM_CRYPT=y)
// This is usual for the custom kernels for projects where disk encryption is required.
var dmCryptConnectedPlugKmod = []string{
"dm_crypt",
}
var dmCryptConnectedPlugUDev = []string{
`KERNEL=="device-mapper"`,
`KERNEL=="dm-[0-9]"`,
`SUBSYSTEM=="block"`,
}
func init() {
registerIface(&commonInterface{
name: "dm-crypt",
summary: dmCryptSummary,
implicitOnCore: true,
implicitOnClassic: true,
baseDeclarationSlots: dmCryptBaseDeclarationSlots,
baseDeclarationPlugs: dmCryptBaseDeclarationPlugs,
connectedPlugAppArmor: dmCryptConnectedPlugAppArmor,
connectedPlugSecComp: dmCryptConnectedPlugSecComp,
connectedPlugKModModules: dmCryptConnectedPlugKmod,
connectedPlugUDev: dmCryptConnectedPlugUDev,
})
}
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