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luks: implements support for Alpine

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Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>
This commit is contained in:
Adphi
2023-02-23 15:02:12 +01:00
parent cab7d8badd
commit beb41450c0
14 changed files with 133 additions and 31 deletions
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1
Dockerfile
View File

@@ -38,6 +38,7 @@ RUN apt-get update && \
mount \
tar \
extlinux \
cryptsetup \
qemu-utils && \
apt-get clean && \
rm -rf /var/lib/apt/lists/*

93
builder.go
View File

@@ -23,6 +23,7 @@ import (
"strings"
"github.com/c2h5oh/datasize"
"github.com/google/uuid"
"github.com/sirupsen/logrus"
"go.uber.org/multierr"
@@ -132,16 +133,31 @@ type builder struct {
loDevice string
bootPart string
rootPart string
cryptPart string
cryptRoot string
mappedCryptRoot string
bootUUID string
rootUUID string
cryptUUID string
luksPassword string
cmdLineExtra string
}
func NewBuilder(ctx context.Context, workdir, imgTag, disk string, size uint64, osRelease OSRelease, format string, cmdLineExtra string, splitBoot bool, bootSize uint64) (Builder, error) {
func NewBuilder(ctx context.Context, workdir, imgTag, disk string, size uint64, osRelease OSRelease, format string, cmdLineExtra string, splitBoot bool, bootSize uint64, luksPassword string) (Builder, error) {
if err := checkDependencies(); err != nil {
return nil, err
}
if luksPassword != "" {
// TODO(adphi): remove this check when we support luks encryption on other distros
if osRelease.ID != ReleaseAlpine {
return nil, fmt.Errorf("luks encryption is only supported on alpine")
}
if !splitBoot {
return nil, fmt.Errorf("luks encryption requires split boot")
}
}
f := strings.ToLower(format)
valid := false
for _, v := range formats {
@@ -202,6 +218,7 @@ func NewBuilder(ctx context.Context, workdir, imgTag, disk string, size uint64,
cmdLineExtra: cmdLineExtra,
splitBoot: splitBoot,
bootSize: bootSize,
luksPassword: luksPassword,
}
if err := os.MkdirAll(b.mntPoint, os.ModePerm); err != nil {
return nil, err
@@ -302,6 +319,37 @@ func (b *builder) mountImg(ctx context.Context) error {
} else {
b.rootPart = b.bootPart
}
if b.isLuksEnabled() {
logrus.Infof("encrypting root partition")
f, err := os.CreateTemp("", "key")
if err != nil {
return err
}
defer f.Close()
defer os.Remove(f.Name())
if _, err := f.WriteString(b.luksPassword); err != nil {
return err
}
// cryptsetup luksFormat --batch-mode --verify-passphrase --type luks2 $ROOT_DEVICE $KEY_FILE
if err := exec.Run(ctx, "cryptsetup", "luksFormat", "--batch-mode", "--type", "luks2", b.rootPart, f.Name()); err != nil {
return err
}
b.cryptRoot = fmt.Sprintf("d2vm-%s-root", uuid.New().String())
// cryptsetup open -d $KEY_FILE $ROOT_DEVICE $ROOT_LABEL
if err := exec.Run(ctx, "cryptsetup", "open", "--key-file", f.Name(), b.rootPart, b.cryptRoot); err != nil {
return err
}
b.cryptPart = b.rootPart
b.rootPart = "/dev/mapper/root"
b.mappedCryptRoot = filepath.Join("/dev/mapper", b.cryptRoot)
logrus.Infof("creating raw image file system")
if err := exec.Run(ctx, "mkfs.ext4", b.mappedCryptRoot); err != nil {
return err
}
if err := exec.Run(ctx, "mount", b.mappedCryptRoot, b.mntPoint); err != nil {
return err
}
} else {
logrus.Infof("creating raw image file system")
if err := exec.Run(ctx, "mkfs.ext4", b.rootPart); err != nil {
return err
@@ -309,6 +357,7 @@ func (b *builder) mountImg(ctx context.Context) error {
if err := exec.Run(ctx, "mount", b.rootPart, b.mntPoint); err != nil {
return err
}
}
if !b.splitBoot {
return nil
}
@@ -328,20 +377,17 @@ func (b *builder) unmountImg(ctx context.Context) error {
logrus.Infof("unmounting raw image")
var merr error
if b.splitBoot {
if err := exec.Run(ctx, "umount", filepath.Join(b.mntPoint, "boot")); err != nil {
merr = multierr.Append(merr, err)
merr = multierr.Append(merr, exec.Run(ctx, "umount", filepath.Join(b.mntPoint, "boot")))
}
merr = multierr.Append(merr, exec.Run(ctx, "umount", b.mntPoint))
if b.isLuksEnabled() {
merr = multierr.Append(merr, exec.Run(ctx, "cryptsetup", "close", b.cryptRoot))
}
if err := exec.Run(ctx, "umount", b.mntPoint); err != nil {
merr = multierr.Append(merr, err)
}
if err := exec.Run(ctx, "kpartx", "-d", b.loDevice); err != nil {
merr = multierr.Append(merr, err)
}
if err := exec.Run(ctx, "losetup", "-d", b.loDevice); err != nil {
merr = multierr.Append(merr, err)
}
return merr
return multierr.Combine(
merr,
exec.Run(ctx, "kpartx", "-d", b.loDevice),
exec.Run(ctx, "losetup", "-d", b.loDevice),
)
}
func (b *builder) copyRootFS(ctx context.Context) error {
@@ -369,6 +415,12 @@ func (b *builder) setupRootFS(ctx context.Context) (err error) {
if err != nil {
return err
}
if b.isLuksEnabled() {
b.cryptUUID, err = diskUUID(ctx, b.cryptPart)
if err != nil {
return err
}
}
fstab = fmt.Sprintf("UUID=%s / ext4 errors=remount-ro 0 1\nUUID=%s /boot ext4 errors=remount-ro 0 2\n", b.rootUUID, b.bootUUID)
} else {
b.bootUUID = b.rootUUID
@@ -449,7 +501,14 @@ func (b *builder) installKernel(ctx context.Context) error {
if err != nil {
return err
}
if err := b.chWriteFile("/boot/syslinux.cfg", fmt.Sprintf(sysconfig, b.rootUUID, b.cmdLineExtra), perm); err != nil {
var cfg string
if b.isLuksEnabled() {
cfg = fmt.Sprintf(sysconfig, b.rootUUID, fmt.Sprintf("%s root=/dev/mapper/root cryptdm=root", b.cmdLineExtra))
cfg = strings.Replace(cfg, "root=UUID="+b.rootUUID, "cryptroot=UUID="+b.cryptUUID, 1)
} else {
cfg = fmt.Sprintf(sysconfig, b.rootUUID, b.cmdLineExtra)
}
if err := b.chWriteFile("/boot/syslinux.cfg", cfg, perm); err != nil {
return err
}
return nil
@@ -483,6 +542,10 @@ func (b *builder) chPath(path string) string {
return fmt.Sprintf("%s%s", b.mntPoint, path)
}
func (b *builder) isLuksEnabled() bool {
return b.luksPassword != ""
}
func (b *builder) Close() error {
return b.img.Close()
}
@@ -498,7 +561,7 @@ func block(path string, size uint64) error {
func checkDependencies() error {
var merr error
for _, v := range []string{"mount", "blkid", "tar", "losetup", "parted", "partprobe", "qemu-img", "extlinux", "dd", "mkfs"} {
for _, v := range []string{"mount", "blkid", "tar", "losetup", "parted", "kpartx", "qemu-img", "extlinux", "dd", "mkfs.ext4", "cryptsetup"} {
if _, err := exec2.LookPath(v); err != nil {
merr = multierr.Append(merr, err)
}

2
builder_test.go
View File

@@ -42,7 +42,7 @@ func testSysconfig(t *testing.T, ctx context.Context, img, sysconf, kernel, init
sys, err := sysconfig(r)
require.NoError(t, err)
assert.Equal(t, sysconf, sys)
d, err := NewDockerfile(r, img, "root", "")
d, err := NewDockerfile(r, img, "root", "", false)
require.NoError(t, err)
logrus.Infof("docker image based on %s", d.Release.Name)
p := filepath.Join(tmpPath, docker.FormatImgName(img))

5
cmd/d2vm/build.go
View File

@@ -79,6 +79,10 @@ var (
}
return docker.RunD2VM(cmd.Context(), d2vm.Image, d2vm.Version, in, out, cmd.Name(), os.Args[2:]...)
}
if luksPassword != "" && !splitBoot {
logrus.Warnf("luks password is set: enabling split boot")
splitBoot = true
}
size, err := parseSize(size)
if err != nil {
return err
@@ -109,6 +113,7 @@ var (
d2vm.WithRaw(raw),
d2vm.WithSplitBoot(splitBoot),
d2vm.WithBootSize(bootSize),
d2vm.WithLuksPassword(luksPassword),
); err != nil {
return err
}

5
cmd/d2vm/convert.go
View File

@@ -51,6 +51,10 @@ var (
}
return docker.RunD2VM(cmd.Context(), d2vm.Image, d2vm.Version, out, out, cmd.Name(), dargs...)
}
if luksPassword != "" && !splitBoot {
logrus.Warnf("luks password is set: enabling split boot")
splitBoot = true
}
img := args[0]
tag := "latest"
if parts := strings.Split(img, ":"); len(parts) > 1 {
@@ -97,6 +101,7 @@ var (
d2vm.WithRaw(raw),
d2vm.WithSplitBoot(splitBoot),
d2vm.WithBootSize(bootSize),
d2vm.WithLuksPassword(luksPassword),
); err != nil {
return err
}

2
cmd/d2vm/flags.go
View File

@@ -35,6 +35,7 @@ var (
networkManager string
splitBoot bool
bootSize uint64
luksPassword string
)
func buildFlags() *pflag.FlagSet {
@@ -50,5 +51,6 @@ func buildFlags() *pflag.FlagSet {
flags.BoolVar(&push, "push", false, "Push the container disk image to the registry")
flags.BoolVar(&splitBoot, "split-boot", false, "Split the boot partition from the root partition")
flags.Uint64Var(&bootSize, "boot-size", 100, "Size of the boot partition in MB")
flags.StringVar(&luksPassword, "luks-password", "", "Password to use for the LUKS encrypted root partition. If not set, the root partition will not be encrypted")
return flags
}

4
convert.go
View File

@@ -46,7 +46,7 @@ func Convert(ctx context.Context, img string, opts ...ConvertOption) error {
return err
}
if !o.raw {
d, err := NewDockerfile(r, img, o.password, o.networkManager)
d, err := NewDockerfile(r, img, o.password, o.networkManager, o.luksPassword != "")
if err != nil {
return err
}
@@ -79,7 +79,7 @@ func Convert(ctx context.Context, img string, opts ...ConvertOption) error {
if format == "" {
format = "raw"
}
b, err := NewBuilder(ctx, tmpPath, imgUUID, "", o.size, r, format, o.cmdLineExtra, o.splitBoot, o.bootSize)
b, err := NewBuilder(ctx, tmpPath, imgUUID, "", o.size, r, format, o.cmdLineExtra, o.splitBoot, o.bootSize, o.luksPassword)
if err != nil {
return err
}

8
convert_options.go
View File

@@ -26,6 +26,8 @@ type convertOptions struct {
splitBoot bool
bootSize uint64
luksPassword string
}
func WithSize(size uint64) ConvertOption {
@@ -75,3 +77,9 @@ func WithBootSize(bootSize uint64) ConvertOption {
o.bootSize = bootSize
}
}
func WithLuksPassword(password string) ConvertOption {
return func(o *convertOptions) {
o.luksPassword = password
}
}

5
dockerfile.go
View File

@@ -64,6 +64,7 @@ type Dockerfile struct {
Password string
Release OSRelease
NetworkManager NetworkManager
Luks bool
tmpl *template.Template
}
@@ -71,8 +72,8 @@ func (d Dockerfile) Render(w io.Writer) error {
return d.tmpl.Execute(w, d)
}
func NewDockerfile(release OSRelease, img, password string, networkManager NetworkManager) (Dockerfile, error) {
d := Dockerfile{Release: release, Image: img, Password: password, NetworkManager: networkManager}
func NewDockerfile(release OSRelease, img, password string, networkManager NetworkManager, luks bool) (Dockerfile, error) {
d := Dockerfile{Release: release, Image: img, Password: password, NetworkManager: networkManager, Luks: luks}
var net NetworkManager
switch release.ID {
case ReleaseDebian:

1
docs/content/reference/d2vm_build.md
View File

@@ -15,6 +15,7 @@ d2vm build [context directory] [flags]
-f, --file string Name of the Dockerfile
--force Override output qcow2 image
-h, --help help for build
--luks-password string Password to use for the LUKS encrypted root partition. If not set, the root partition will not be encrypted
--network-manager string Network manager to use for the image: none, netplan, ifupdown
-o, --output string The output image, the extension determine the image format, raw will be used if none. Supported formats: qcow2 qed raw vdi vhd vmdk (default "disk0.qcow2")
-p, --password string Optional root user password

1
docs/content/reference/d2vm_convert.md
View File

@@ -13,6 +13,7 @@ d2vm convert [docker image] [flags]
--boot-size uint Size of the boot partition in MB (default 100)
--force Override output qcow2 image
-h, --help help for convert
--luks-password string Password to use for the LUKS encrypted root partition. If not set, the root partition will not be encrypted
--network-manager string Network manager to use for the image: none, netplan, ifupdown
-o, --output string The output image, the extension determine the image format, raw will be used if none. Supported formats: qcow2 qed raw vdi vhd vmdk (default "disk0.qcow2")
-p, --password string Optional root user password

9
templates/alpine.Dockerfile
View File

@@ -6,6 +6,9 @@ RUN apk update --no-cache && \
apk add \
util-linux \
linux-virt \
{{- if .Luks }}
cryptsetup \
{{- end }}
{{- if ge .Release.VersionID "3.17" }}
busybox-openrc \
busybox-mdev-openrc \
@@ -29,3 +32,9 @@ allow-hotplug eth0\n\
iface eth0 inet dhcp\n\
' > /etc/network/interfaces
{{ end }}
{{- if .Luks }}
RUN source /etc/mkinitfs/mkinitfs.conf && \
echo "features=\"${features} cryptsetup\"" > /etc/mkinitfs/mkinitfs.conf && \
mkinitfs $(ls /lib/modules)
{{- end }}

3
templates/debian.Dockerfile
View File

@@ -4,6 +4,9 @@ USER root
RUN apt-get -y update && \
DEBIAN_FRONTEND=noninteractive apt-get -y install --no-install-recommends \
{{- if .Luks }}
cryptsetup \
{{- end }}
linux-image-amd64
RUN DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \

3
templates/ubuntu.Dockerfile
View File

@@ -6,6 +6,9 @@ RUN apt-get update -y && \
DEBIAN_FRONTEND=noninteractive apt-get -y install --no-install-recommends \
linux-image-virtual \
initramfs-tools \
{{- if .Luks }}
cryptsetup \
{{- end }}
systemd-sysv \
systemd \
dbus \