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110 lines
3.1 KiB
Go
110 lines
3.1 KiB
Go
// -*- Mode: Go; indent-tabs-mode: t -*-
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/*
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* Copyright (C) 2021 Canonical Ltd
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 3 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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package builtin
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import (
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"github.com/snapcore/snapd/snap"
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)
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const dmCryptSummary = `allows encryption and decryption of block storage devices`
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const dmCryptBaseDeclarationSlots = `
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dm-crypt:
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allow-installation:
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slot-snap-type:
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- core
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deny-auto-connection: true
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`
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const dmCryptBaseDeclarationPlugs = `
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dm-crypt:
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allow-installation: false
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deny-auto-connection: true
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`
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// The type for this interface
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type dmCryptInterface struct{}
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// XXX: this should not hardcode mount points like /run/media/ but unless we
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// have an interface like "mount-control" this is needed
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const dmCryptConnectedPlugAppArmor = `
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# Allow mapper access
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/dev/mapper/control rw,
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/dev/dm-[0-9]* rwk,
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# allow use of cryptsetup from core snap
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/{,usr/}sbin/cryptsetup ixr,
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# Mount points could be in /run/media/<user>/* or /media/<user>/*
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/run/systemd/seats/* r,
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/{,run/}media/{,**} rw,
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mount options=(ro,nosuid,nodev) /dev/dm-[0-9]* -> /{,run/}media/**,
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mount options=(rw,nosuid,nodev) /dev/dm-[0-9]* -> /{,run/}media/**,
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# exec mount/umount to do the actual operations
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/{,usr/}bin/mount ixr,
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/{,usr/}bin/umount ixr,
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# mount/umount (via libmount) track some mount info in these files
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/{,var/}run/mount/utab* wrlk,
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# Allow access to the file locking mechanism
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/{,var/}run/cryptsetup/ rw,
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/{,var/}run/cryptsetup/* rwk,
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/{,var/}run/ r,
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`
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const dmCryptConnectedPlugSecComp = `
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# Description: Allow kernel keyring manipulation
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add_key
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keyctl
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request_key
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`
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// dm-crypt
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// Note that often dm-crypt is statically linked into the kernel (CONFIG_DM_CRYPT=y)
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// This is usual for the custom kernels for projects where disk encryption is required.
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var dmCryptConnectedPlugKmod = []string{
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"dm_crypt",
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}
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var dmCryptConnectedPlugUDev = []string{
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`KERNEL=="device-mapper"`,
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`KERNEL=="dm-[0-9]"`,
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`SUBSYSTEM=="block"`,
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}
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func (iface *dmCryptInterface) AutoConnect(*snap.PlugInfo, *snap.SlotInfo) bool {
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// Allow what is allowed in the declarations
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return true
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}
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func init() {
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registerIface(&commonInterface{
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name: "dm-crypt",
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summary: dmCryptSummary,
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implicitOnCore: true,
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implicitOnClassic: true,
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baseDeclarationSlots: dmCryptBaseDeclarationSlots,
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baseDeclarationPlugs: dmCryptBaseDeclarationPlugs,
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connectedPlugAppArmor: dmCryptConnectedPlugAppArmor,
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connectedPlugSecComp: dmCryptConnectedPlugSecComp,
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connectedPlugKModModules: dmCryptConnectedPlugKmod,
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connectedPlugUDev: dmCryptConnectedPlugUDev,
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})
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}
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