mirror of
https://github.com/edgelesssys/constellation.git
synced 2024-12-24 06:59:40 -05:00
csi: allow building without cgo dependencies for linting
This commit is contained in:
Malte Poll
Malte Poll
parent
94758bc392
commit
ad85dacf6a
@ -3,16 +3,30 @@ load("//bazel/go:go_test.bzl", "go_ld_test", "go_test")
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go_library(
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name = "cryptmapper",
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srcs = ["cryptmapper.go"],
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srcs = [
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"cryptmapper.go",
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"cryptmapper_cgo.go",
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"cryptmapper_cross.go",
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],
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importpath = "github.com/edgelesssys/constellation/v2/csi/cryptmapper",
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visibility = ["//visibility:public"],
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deps = [
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"//internal/crypto",
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"//internal/cryptsetup",
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"@com_github_martinjungblut_go_cryptsetup//:go-cryptsetup",
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"@io_k8s_mount_utils//:mount-utils",
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"@io_k8s_utils//exec",
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],
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deps = select({
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"@io_bazel_rules_go//go/platform:android": [
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"//internal/crypto",
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"//internal/cryptsetup",
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"@com_github_martinjungblut_go_cryptsetup//:go-cryptsetup",
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"@io_k8s_mount_utils//:mount-utils",
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"@io_k8s_utils//exec",
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],
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"@io_bazel_rules_go//go/platform:linux": [
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"//internal/crypto",
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"//internal/cryptsetup",
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"@com_github_martinjungblut_go_cryptsetup//:go-cryptsetup",
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"@io_k8s_mount_utils//:mount-utils",
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"@io_k8s_utils//exec",
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],
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"//conditions:default": [],
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}),
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)
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go_test(
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@ -21,11 +35,19 @@ go_test(
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embed = [":cryptmapper"],
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# keep
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tags = ["manual"],
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deps = [
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"@com_github_martinjungblut_go_cryptsetup//:go-cryptsetup",
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"@com_github_stretchr_testify//assert",
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"@org_uber_go_goleak//:goleak",
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],
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deps = select({
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"@io_bazel_rules_go//go/platform:android": [
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"@com_github_martinjungblut_go_cryptsetup//:go-cryptsetup",
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"@com_github_stretchr_testify//assert",
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"@org_uber_go_goleak//:goleak",
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],
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"@io_bazel_rules_go//go/platform:linux": [
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"@com_github_martinjungblut_go_cryptsetup//:go-cryptsetup",
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"@com_github_stretchr_testify//assert",
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"@org_uber_go_goleak//:goleak",
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],
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"//conditions:default": [],
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}),
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)
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go_ld_test(
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@ -9,398 +9,9 @@ package cryptmapper
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import (
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"context"
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"errors"
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"fmt"
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"io/fs"
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"path/filepath"
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"strings"
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"sync"
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"time"
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"github.com/edgelesssys/constellation/v2/internal/crypto"
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ccryptsetup "github.com/edgelesssys/constellation/v2/internal/cryptsetup"
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cryptsetup "github.com/martinjungblut/go-cryptsetup"
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mount "k8s.io/mount-utils"
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utilexec "k8s.io/utils/exec"
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)
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const (
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// LUKSHeaderSize is the amount of bytes taken up by the header of a LUKS2 partition.
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// The header is 16MiB (1048576 Bytes * 16).
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LUKSHeaderSize = 16777216
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cryptPrefix = "/dev/mapper/"
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integritySuffix = "_dif"
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integrityFSSuffix = "-integrity"
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keySizeIntegrity = 96
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keySizeCrypt = 64
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)
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// packageLock is needed to block concurrent use of package functions, since libcryptsetup is not thread safe.
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// See: https://gitlab.com/cryptsetup/cryptsetup/-/issues/710
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//
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// https://stackoverflow.com/questions/30553386/cryptsetup-backend-safe-with-multithreading
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var packageLock = sync.Mutex{}
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func init() {
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cryptsetup.SetDebugLevel(cryptsetup.CRYPT_LOG_NORMAL)
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cryptsetup.SetLogCallback(func(_ int, message string) { fmt.Printf("libcryptsetup: %s\n", message) })
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}
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// KeyCreator is an interface to create data encryption keys.
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type KeyCreator interface {
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GetDEK(ctx context.Context, dekID string, dekSize int) ([]byte, error)
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}
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// DeviceMapper is an interface for device mapper methods.
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type DeviceMapper interface {
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// Init initializes a crypt device backed by 'devicePath'.
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// Sets the deviceMapper to the newly allocated Device or returns any error encountered.
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Init(devicePath string) error
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// InitByName initializes a crypt device from provided active device 'name'.
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// Sets the deviceMapper to the newly allocated Device or returns any error encountered.
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InitByName(name string) error
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// ActivateByPassphrase activates a device by using a passphrase from a specific keyslot.
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// Returns nil on success, or an error otherwise.
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ActivateByPassphrase(deviceName string, keyslot int, passphrase string, flags int) error
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// ActivateByVolumeKey activates a device by using a volume key.
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// Returns nil on success, or an error otherwise.
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ActivateByVolumeKey(deviceName string, volumeKey string, volumeKeySize int, flags int) error
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// Deactivate deactivates a device.
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// Returns nil on success, or an error otherwise.
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Deactivate(deviceName string) error
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// Format formats a Device, using a specific device type, and type-independent parameters.
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// Returns nil on success, or an error otherwise.
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Format(deviceType cryptsetup.DeviceType, genericParams cryptsetup.GenericParams) error
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// Free releases crypt device context and used memory.
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Free() bool
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// GetDeviceName gets the path to the underlying device.
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GetDeviceName() string
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// GetUUID gets the devices UUID
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GetUUID() string
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// Load loads crypt device parameters from the on-disk header.
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// Returns nil on success, or an error otherwise.
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Load(cryptsetup.DeviceType) error
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// KeyslotAddByVolumeKey adds a key slot using a volume key to perform the required security check.
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// Returns nil on success, or an error otherwise.
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KeyslotAddByVolumeKey(keyslot int, volumeKey string, passphrase string) error
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// Wipe removes existing data and clears the device for use with dm-integrity.
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// Returns nil on success, or an error otherwise.
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Wipe(devicePath string, pattern int, offset, length uint64, wipeBlockSize int, flags int, progress func(size, offset uint64) int) error
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// Resize the crypt device.
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// Returns nil on success, or an error otherwise.
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Resize(name string, newSize uint64) error
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}
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// CryptDevice is a wrapper for cryptsetup.Device.
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type CryptDevice struct {
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*cryptsetup.Device
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}
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// Init initializes a crypt device backed by 'devicePath'.
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// Sets the cryptDevice's deviceMapper to the newly allocated Device or returns any error encountered.
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func (c *CryptDevice) Init(devicePath string) error {
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device, err := cryptsetup.Init(devicePath)
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if err != nil {
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return err
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}
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c.Device = device
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return nil
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}
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// InitByName initializes a crypt device from provided active device 'name'.
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// Sets the deviceMapper to the newly allocated Device or returns any error encountered.
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func (c *CryptDevice) InitByName(name string) error {
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device, err := cryptsetup.InitByName(name)
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if err != nil {
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return err
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}
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c.Device = device
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return nil
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}
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// Free releases crypt device context and used memory.
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func (c *CryptDevice) Free() bool {
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res := c.Device.Free()
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c.Device = nil
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return res
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}
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// CryptMapper manages dm-crypt volumes.
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type CryptMapper struct {
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mapper DeviceMapper
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kms KeyCreator
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}
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// New initializes a new CryptMapper with the given kms client and key-encryption-key ID.
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// kms is used to fetch data encryption keys for the dm-crypt volumes.
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func New(kms KeyCreator, mapper DeviceMapper) *CryptMapper {
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return &CryptMapper{
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mapper: mapper,
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kms: kms,
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}
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}
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// CloseCryptDevice closes the crypt device mapped for volumeID.
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// Returns nil if the volume does not exist.
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func (c *CryptMapper) CloseCryptDevice(volumeID string) error {
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source, err := filepath.EvalSymlinks(cryptPrefix + volumeID)
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if err != nil {
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var pathErr *fs.PathError
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if errors.As(err, &pathErr) {
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return nil
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}
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return fmt.Errorf("getting device path for disk %q: %w", cryptPrefix+volumeID, err)
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}
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if err := closeCryptDevice(c.mapper, source, volumeID, "crypt"); err != nil {
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return fmt.Errorf("closing crypt device: %w", err)
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}
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integrity, err := filepath.EvalSymlinks(cryptPrefix + volumeID + integritySuffix)
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if err == nil {
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// If device was created with integrity, we need to also close the integrity device
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integrityErr := closeCryptDevice(c.mapper, integrity, volumeID+integritySuffix, "integrity")
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if integrityErr != nil {
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return integrityErr
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}
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}
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if err != nil {
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var pathErr *fs.PathError
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if errors.As(err, &pathErr) {
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// integrity device does not exist
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return nil
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}
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return fmt.Errorf("getting device path for disk %q: %w", cryptPrefix+volumeID, err)
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}
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return nil
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}
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// OpenCryptDevice maps the volume at source to the crypt device identified by volumeID.
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// The key used to encrypt the volume is fetched using CryptMapper's kms client.
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func (c *CryptMapper) OpenCryptDevice(ctx context.Context, source, volumeID string, integrity bool) (string, error) {
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m := &mount.SafeFormatAndMount{Exec: utilexec.New()}
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return openCryptDevice(ctx, c.mapper, source, volumeID, integrity, c.kms.GetDEK, m.GetDiskFormat)
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}
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// ResizeCryptDevice resizes the underlying crypt device and returns the mapped device path.
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func (c *CryptMapper) ResizeCryptDevice(ctx context.Context, volumeID string) (string, error) {
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if err := resizeCryptDevice(ctx, c.mapper, volumeID, c.kms.GetDEK); err != nil {
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return "", err
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}
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return cryptPrefix + volumeID, nil
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}
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// GetDevicePath returns the device path of a mapped crypt device.
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func (c *CryptMapper) GetDevicePath(volumeID string) (string, error) {
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return getDevicePath(c.mapper, strings.TrimPrefix(volumeID, cryptPrefix))
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}
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// closeCryptDevice closes the crypt device mapped for volumeID.
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func closeCryptDevice(device DeviceMapper, source, volumeID, deviceType string) error {
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packageLock.Lock()
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defer packageLock.Unlock()
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if err := device.InitByName(volumeID); err != nil {
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return fmt.Errorf("initializing dm-%s to unmap device %q: %w", deviceType, source, err)
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}
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defer device.Free()
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if err := device.Deactivate(volumeID); err != nil {
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return fmt.Errorf("deactivating dm-%s volume %q for device %q: %w", deviceType, cryptPrefix+volumeID, source, err)
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}
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return nil
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}
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// openCryptDevice maps the volume at source to the crypt device identified by volumeID.
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func openCryptDevice(ctx context.Context, device DeviceMapper, source, volumeID string, integrity bool,
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getKey func(ctx context.Context, keyID string, keySize int) ([]byte, error), diskInfo func(disk string) (string, error),
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) (string, error) {
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packageLock.Lock()
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defer packageLock.Unlock()
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var integrityType string
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keySize := keySizeCrypt
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if integrity {
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integrityType = "hmac(sha256)"
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keySize = keySizeIntegrity
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}
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// Initialize the block device
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if err := device.Init(source); err != nil {
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return "", fmt.Errorf("initializing dm-crypt to map device %q: %w", source, err)
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}
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defer device.Free()
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var passphrase []byte
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// Try to load LUKS headers
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// If this fails, the device is either not formatted at all, or already formatted with a different FS
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if err := device.Load(cryptsetup.LUKS2{}); err != nil {
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format, err := diskInfo(source)
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if err != nil {
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return "", fmt.Errorf("determining if disk is formatted: %w", err)
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}
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if format != "" {
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return "", fmt.Errorf("disk %q is already formatted as: %s", source, format)
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}
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// Device is not formatted, so we can safely create a new LUKS2 partition
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if err := device.Format(
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cryptsetup.LUKS2{
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SectorSize: 4096,
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Integrity: integrityType,
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PBKDFType: &cryptsetup.PbkdfType{
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// Use low memory recommendation from https://datatracker.ietf.org/doc/html/rfc9106#section-7
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Type: "argon2id",
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TimeMs: 2000,
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Iterations: 3,
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ParallelThreads: 4,
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MaxMemoryKb: 65536, // ~64MiB
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},
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},
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cryptsetup.GenericParams{
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Cipher: "aes",
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CipherMode: "xts-plain64",
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VolumeKeySize: keySize,
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}); err != nil {
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return "", fmt.Errorf("formatting device %q: %w", source, err)
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}
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uuid := device.GetUUID()
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passphrase, err = getKey(ctx, uuid, crypto.StateDiskKeyLength)
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if err != nil {
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return "", err
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}
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if len(passphrase) != crypto.StateDiskKeyLength {
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return "", fmt.Errorf("expected key length to be [%d] but got [%d]", crypto.StateDiskKeyLength, len(passphrase))
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}
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// Add a new keyslot using the internal volume key
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if err := device.KeyslotAddByVolumeKey(0, "", string(passphrase)); err != nil {
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return "", fmt.Errorf("adding keyslot: %w", err)
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}
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if integrity {
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if err := performWipe(device, volumeID); err != nil {
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return "", fmt.Errorf("wiping device: %w", err)
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}
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}
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} else {
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uuid := device.GetUUID()
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passphrase, err = getKey(ctx, uuid, crypto.StateDiskKeyLength)
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if err != nil {
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return "", err
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}
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if len(passphrase) != crypto.StateDiskKeyLength {
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return "", fmt.Errorf("expected key length to be [%d] but got [%d]", crypto.StateDiskKeyLength, len(passphrase))
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}
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}
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if err := device.ActivateByPassphrase(volumeID, 0, string(passphrase), ccryptsetup.ReadWriteQueueBypass); err != nil {
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return "", fmt.Errorf("trying to activate dm-crypt volume: %w", err)
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}
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return cryptPrefix + volumeID, nil
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}
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// performWipe handles setting up parameters and clearing the device for dm-integrity.
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func performWipe(device DeviceMapper, volumeID string) error {
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tmpDevice := "temporary-cryptsetup-" + volumeID
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// Active as temporary device
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if err := device.ActivateByVolumeKey(tmpDevice, "", 0, (cryptsetup.CRYPT_ACTIVATE_PRIVATE | cryptsetup.CRYPT_ACTIVATE_NO_JOURNAL)); err != nil {
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return fmt.Errorf("trying to activate temporary dm-crypt volume: %w", err)
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}
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// No terminal available, limit callbacks to once every 30 seconds to not fill up logs with large amount of progress updates
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ticker := time.NewTicker(30 * time.Second)
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firstReq := make(chan struct{}, 1)
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firstReq <- struct{}{}
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defer ticker.Stop()
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logProgress := func(size, offset uint64) {
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prog := (float64(offset) / float64(size)) * 100
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fmt.Printf("Wipe in progress: %.2f%%\n", prog)
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}
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progressCallback := func(size, offset uint64) int {
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select {
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case <-firstReq:
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logProgress(size, offset)
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case <-ticker.C:
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logProgress(size, offset)
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default:
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}
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return 0
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}
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// Wipe the device using the same options as used in cryptsetup: https://gitlab.com/cryptsetup/cryptsetup/-/blob/v2.4.3/src/cryptsetup.c#L1345
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if err := device.Wipe(cryptPrefix+tmpDevice, cryptsetup.CRYPT_WIPE_ZERO, 0, 0, 1024*1024, 0, progressCallback); err != nil {
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return err
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}
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// Deactivate the temporary device
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if err := device.Deactivate(tmpDevice); err != nil {
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return fmt.Errorf("deactivating temporary volume: %w", err)
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}
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return nil
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}
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func resizeCryptDevice(ctx context.Context, device DeviceMapper, name string,
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getKey func(ctx context.Context, keyID string, keySize int) ([]byte, error),
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) error {
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packageLock.Lock()
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defer packageLock.Unlock()
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if err := device.InitByName(name); err != nil {
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return fmt.Errorf("initializing device: %w", err)
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}
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defer device.Free()
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if err := device.Load(cryptsetup.LUKS2{}); err != nil {
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return fmt.Errorf("loading device: %w", err)
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}
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passphrase, err := getKey(ctx, device.GetUUID(), crypto.StateDiskKeyLength)
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if err != nil {
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return fmt.Errorf("getting key: %w", err)
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}
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if err := device.ActivateByPassphrase("", 0, string(passphrase), cryptsetup.CRYPT_ACTIVATE_KEYRING_KEY|ccryptsetup.ReadWriteQueueBypass); err != nil {
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return fmt.Errorf("activating keyring for crypt device %q with passphrase: %w", name, err)
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}
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if err := device.Resize(name, 0); err != nil {
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return fmt.Errorf("resizing device: %w", err)
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}
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return nil
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}
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func getDevicePath(device DeviceMapper, name string) (string, error) {
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packageLock.Lock()
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defer packageLock.Unlock()
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if err := device.InitByName(name); err != nil {
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return "", fmt.Errorf("initializing device: %w", err)
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}
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defer device.Free()
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deviceName := device.GetDeviceName()
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if deviceName == "" {
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return "", errors.New("unable to determine device name")
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}
|
||||
return deviceName, nil
|
||||
}
|
||||
|
||||
// IsIntegrityFS checks if the fstype string contains an integrity suffix.
|
||||
// If yes, returns the trimmed fstype and true, fstype and false otherwise.
|
||||
func IsIntegrityFS(fstype string) (string, bool) {
|
||||
if strings.HasSuffix(fstype, integrityFSSuffix) {
|
||||
return strings.TrimSuffix(fstype, integrityFSSuffix), true
|
||||
}
|
||||
return fstype, false
|
||||
}
|
||||
|
||||
402
csi/cryptmapper/cryptmapper_cgo.go
Normal file
402
csi/cryptmapper/cryptmapper_cgo.go
Normal file
@ -0,0 +1,402 @@
|
||||
//go:build linux && cgo
|
||||
|
||||
/*
|
||||
Copyright (c) Edgeless Systems GmbH
|
||||
|
||||
SPDX-License-Identifier: AGPL-3.0-only
|
||||
*/
|
||||
|
||||
package cryptmapper
|
||||
|
||||
import (
|
||||
"context"
|
||||
"errors"
|
||||
"fmt"
|
||||
"io/fs"
|
||||
"path/filepath"
|
||||
"strings"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"github.com/edgelesssys/constellation/v2/internal/crypto"
|
||||
ccryptsetup "github.com/edgelesssys/constellation/v2/internal/cryptsetup"
|
||||
cryptsetup "github.com/martinjungblut/go-cryptsetup"
|
||||
mount "k8s.io/mount-utils"
|
||||
utilexec "k8s.io/utils/exec"
|
||||
)
|
||||
|
||||
const (
|
||||
// LUKSHeaderSize is the amount of bytes taken up by the header of a LUKS2 partition.
|
||||
// The header is 16MiB (1048576 Bytes * 16).
|
||||
LUKSHeaderSize = 16777216
|
||||
cryptPrefix = "/dev/mapper/"
|
||||
integritySuffix = "_dif"
|
||||
integrityFSSuffix = "-integrity"
|
||||
keySizeIntegrity = 96
|
||||
keySizeCrypt = 64
|
||||
)
|
||||
|
||||
// packageLock is needed to block concurrent use of package functions, since libcryptsetup is not thread safe.
|
||||
// See: https://gitlab.com/cryptsetup/cryptsetup/-/issues/710
|
||||
//
|
||||
// https://stackoverflow.com/questions/30553386/cryptsetup-backend-safe-with-multithreading
|
||||
var packageLock = sync.Mutex{}
|
||||
|
||||
func init() {
|
||||
cryptsetup.SetDebugLevel(cryptsetup.CRYPT_LOG_NORMAL)
|
||||
cryptsetup.SetLogCallback(func(_ int, message string) { fmt.Printf("libcryptsetup: %s\n", message) })
|
||||
}
|
||||
|
||||
// deviceMapper is an interface for device mapper methods.
|
||||
type deviceMapper interface {
|
||||
// Init initializes a crypt device backed by 'devicePath'.
|
||||
// Sets the deviceMapper to the newly allocated Device or returns any error encountered.
|
||||
Init(devicePath string) error
|
||||
// InitByName initializes a crypt device from provided active device 'name'.
|
||||
// Sets the deviceMapper to the newly allocated Device or returns any error encountered.
|
||||
InitByName(name string) error
|
||||
// ActivateByPassphrase activates a device by using a passphrase from a specific keyslot.
|
||||
// Returns nil on success, or an error otherwise.
|
||||
ActivateByPassphrase(deviceName string, keyslot int, passphrase string, flags int) error
|
||||
// ActivateByVolumeKey activates a device by using a volume key.
|
||||
// Returns nil on success, or an error otherwise.
|
||||
ActivateByVolumeKey(deviceName string, volumeKey string, volumeKeySize int, flags int) error
|
||||
// Deactivate deactivates a device.
|
||||
// Returns nil on success, or an error otherwise.
|
||||
Deactivate(deviceName string) error
|
||||
// Format formats a Device, using a specific device type, and type-independent parameters.
|
||||
// Returns nil on success, or an error otherwise.
|
||||
Format(deviceType cryptsetup.DeviceType, genericParams cryptsetup.GenericParams) error
|
||||
// Free releases crypt device context and used memory.
|
||||
Free() bool
|
||||
// GetDeviceName gets the path to the underlying device.
|
||||
GetDeviceName() string
|
||||
// GetUUID gets the devices UUID
|
||||
GetUUID() string
|
||||
// Load loads crypt device parameters from the on-disk header.
|
||||
// Returns nil on success, or an error otherwise.
|
||||
Load(cryptsetup.DeviceType) error
|
||||
// KeyslotAddByVolumeKey adds a key slot using a volume key to perform the required security check.
|
||||
// Returns nil on success, or an error otherwise.
|
||||
KeyslotAddByVolumeKey(keyslot int, volumeKey string, passphrase string) error
|
||||
// Wipe removes existing data and clears the device for use with dm-integrity.
|
||||
// Returns nil on success, or an error otherwise.
|
||||
Wipe(devicePath string, pattern int, offset, length uint64, wipeBlockSize int, flags int, progress func(size, offset uint64) int) error
|
||||
// Resize the crypt device.
|
||||
// Returns nil on success, or an error otherwise.
|
||||
Resize(name string, newSize uint64) error
|
||||
}
|
||||
|
||||
// CryptDevice is a wrapper for cryptsetup.Device.
|
||||
type CryptDevice struct {
|
||||
*cryptsetup.Device
|
||||
}
|
||||
|
||||
// Init initializes a crypt device backed by 'devicePath'.
|
||||
// Sets the cryptDevice's deviceMapper to the newly allocated Device or returns any error encountered.
|
||||
func (c *CryptDevice) Init(devicePath string) error {
|
||||
device, err := cryptsetup.Init(devicePath)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
c.Device = device
|
||||
return nil
|
||||
}
|
||||
|
||||
// InitByName initializes a crypt device from provided active device 'name'.
|
||||
// Sets the deviceMapper to the newly allocated Device or returns any error encountered.
|
||||
func (c *CryptDevice) InitByName(name string) error {
|
||||
device, err := cryptsetup.InitByName(name)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
c.Device = device
|
||||
return nil
|
||||
}
|
||||
|
||||
// Free releases crypt device context and used memory.
|
||||
func (c *CryptDevice) Free() bool {
|
||||
res := c.Device.Free()
|
||||
c.Device = nil
|
||||
return res
|
||||
}
|
||||
|
||||
// CryptMapper manages dm-crypt volumes.
|
||||
type CryptMapper struct {
|
||||
mapper deviceMapper
|
||||
kms KeyCreator
|
||||
}
|
||||
|
||||
// New initializes a new CryptMapper with the given kms client and key-encryption-key ID.
|
||||
// kms is used to fetch data encryption keys for the dm-crypt volumes.
|
||||
func New(kms KeyCreator, mapper deviceMapper) *CryptMapper {
|
||||
return &CryptMapper{
|
||||
mapper: mapper,
|
||||
kms: kms,
|
||||
}
|
||||
}
|
||||
|
||||
// CloseCryptDevice closes the crypt device mapped for volumeID.
|
||||
// Returns nil if the volume does not exist.
|
||||
func (c *CryptMapper) CloseCryptDevice(volumeID string) error {
|
||||
source, err := filepath.EvalSymlinks(cryptPrefix + volumeID)
|
||||
if err != nil {
|
||||
var pathErr *fs.PathError
|
||||
if errors.As(err, &pathErr) {
|
||||
return nil
|
||||
}
|
||||
return fmt.Errorf("getting device path for disk %q: %w", cryptPrefix+volumeID, err)
|
||||
}
|
||||
if err := closeCryptDevice(c.mapper, source, volumeID, "crypt"); err != nil {
|
||||
return fmt.Errorf("closing crypt device: %w", err)
|
||||
}
|
||||
|
||||
integrity, err := filepath.EvalSymlinks(cryptPrefix + volumeID + integritySuffix)
|
||||
if err == nil {
|
||||
// If device was created with integrity, we need to also close the integrity device
|
||||
integrityErr := closeCryptDevice(c.mapper, integrity, volumeID+integritySuffix, "integrity")
|
||||
if integrityErr != nil {
|
||||
return integrityErr
|
||||
}
|
||||
}
|
||||
if err != nil {
|
||||
var pathErr *fs.PathError
|
||||
if errors.As(err, &pathErr) {
|
||||
// integrity device does not exist
|
||||
return nil
|
||||
}
|
||||
return fmt.Errorf("getting device path for disk %q: %w", cryptPrefix+volumeID, err)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// OpenCryptDevice maps the volume at source to the crypt device identified by volumeID.
|
||||
// The key used to encrypt the volume is fetched using CryptMapper's kms client.
|
||||
func (c *CryptMapper) OpenCryptDevice(ctx context.Context, source, volumeID string, integrity bool) (string, error) {
|
||||
m := &mount.SafeFormatAndMount{Exec: utilexec.New()}
|
||||
return openCryptDevice(ctx, c.mapper, source, volumeID, integrity, c.kms.GetDEK, m.GetDiskFormat)
|
||||
}
|
||||
|
||||
// ResizeCryptDevice resizes the underlying crypt device and returns the mapped device path.
|
||||
func (c *CryptMapper) ResizeCryptDevice(ctx context.Context, volumeID string) (string, error) {
|
||||
if err := resizeCryptDevice(ctx, c.mapper, volumeID, c.kms.GetDEK); err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
||||
return cryptPrefix + volumeID, nil
|
||||
}
|
||||
|
||||
// GetDevicePath returns the device path of a mapped crypt device.
|
||||
func (c *CryptMapper) GetDevicePath(volumeID string) (string, error) {
|
||||
return getDevicePath(c.mapper, strings.TrimPrefix(volumeID, cryptPrefix))
|
||||
}
|
||||
|
||||
// closeCryptDevice closes the crypt device mapped for volumeID.
|
||||
func closeCryptDevice(device deviceMapper, source, volumeID, deviceType string) error {
|
||||
packageLock.Lock()
|
||||
defer packageLock.Unlock()
|
||||
|
||||
if err := device.InitByName(volumeID); err != nil {
|
||||
return fmt.Errorf("initializing dm-%s to unmap device %q: %w", deviceType, source, err)
|
||||
}
|
||||
defer device.Free()
|
||||
|
||||
if err := device.Deactivate(volumeID); err != nil {
|
||||
return fmt.Errorf("deactivating dm-%s volume %q for device %q: %w", deviceType, cryptPrefix+volumeID, source, err)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// openCryptDevice maps the volume at source to the crypt device identified by volumeID.
|
||||
func openCryptDevice(ctx context.Context, device deviceMapper, source, volumeID string, integrity bool,
|
||||
getKey func(ctx context.Context, keyID string, keySize int) ([]byte, error), diskInfo func(disk string) (string, error),
|
||||
) (string, error) {
|
||||
packageLock.Lock()
|
||||
defer packageLock.Unlock()
|
||||
|
||||
var integrityType string
|
||||
keySize := keySizeCrypt
|
||||
if integrity {
|
||||
integrityType = "hmac(sha256)"
|
||||
keySize = keySizeIntegrity
|
||||
}
|
||||
|
||||
// Initialize the block device
|
||||
if err := device.Init(source); err != nil {
|
||||
return "", fmt.Errorf("initializing dm-crypt to map device %q: %w", source, err)
|
||||
}
|
||||
defer device.Free()
|
||||
|
||||
var passphrase []byte
|
||||
// Try to load LUKS headers
|
||||
// If this fails, the device is either not formatted at all, or already formatted with a different FS
|
||||
if err := device.Load(cryptsetup.LUKS2{}); err != nil {
|
||||
format, err := diskInfo(source)
|
||||
if err != nil {
|
||||
return "", fmt.Errorf("determining if disk is formatted: %w", err)
|
||||
}
|
||||
if format != "" {
|
||||
return "", fmt.Errorf("disk %q is already formatted as: %s", source, format)
|
||||
}
|
||||
|
||||
// Device is not formatted, so we can safely create a new LUKS2 partition
|
||||
if err := device.Format(
|
||||
cryptsetup.LUKS2{
|
||||
SectorSize: 4096,
|
||||
Integrity: integrityType,
|
||||
PBKDFType: &cryptsetup.PbkdfType{
|
||||
// Use low memory recommendation from https://datatracker.ietf.org/doc/html/rfc9106#section-7
|
||||
Type: "argon2id",
|
||||
TimeMs: 2000,
|
||||
Iterations: 3,
|
||||
ParallelThreads: 4,
|
||||
MaxMemoryKb: 65536, // ~64MiB
|
||||
},
|
||||
},
|
||||
cryptsetup.GenericParams{
|
||||
Cipher: "aes",
|
||||
CipherMode: "xts-plain64",
|
||||
VolumeKeySize: keySize,
|
||||
}); err != nil {
|
||||
return "", fmt.Errorf("formatting device %q: %w", source, err)
|
||||
}
|
||||
|
||||
uuid := device.GetUUID()
|
||||
passphrase, err = getKey(ctx, uuid, crypto.StateDiskKeyLength)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
if len(passphrase) != crypto.StateDiskKeyLength {
|
||||
return "", fmt.Errorf("expected key length to be [%d] but got [%d]", crypto.StateDiskKeyLength, len(passphrase))
|
||||
}
|
||||
|
||||
// Add a new keyslot using the internal volume key
|
||||
if err := device.KeyslotAddByVolumeKey(0, "", string(passphrase)); err != nil {
|
||||
return "", fmt.Errorf("adding keyslot: %w", err)
|
||||
}
|
||||
|
||||
if integrity {
|
||||
if err := performWipe(device, volumeID); err != nil {
|
||||
return "", fmt.Errorf("wiping device: %w", err)
|
||||
}
|
||||
}
|
||||
} else {
|
||||
uuid := device.GetUUID()
|
||||
passphrase, err = getKey(ctx, uuid, crypto.StateDiskKeyLength)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
if len(passphrase) != crypto.StateDiskKeyLength {
|
||||
return "", fmt.Errorf("expected key length to be [%d] but got [%d]", crypto.StateDiskKeyLength, len(passphrase))
|
||||
}
|
||||
}
|
||||
|
||||
if err := device.ActivateByPassphrase(volumeID, 0, string(passphrase), ccryptsetup.ReadWriteQueueBypass); err != nil {
|
||||
return "", fmt.Errorf("trying to activate dm-crypt volume: %w", err)
|
||||
}
|
||||
|
||||
return cryptPrefix + volumeID, nil
|
||||
}
|
||||
|
||||
// performWipe handles setting up parameters and clearing the device for dm-integrity.
|
||||
func performWipe(device deviceMapper, volumeID string) error {
|
||||
tmpDevice := "temporary-cryptsetup-" + volumeID
|
||||
|
||||
// Active as temporary device
|
||||
if err := device.ActivateByVolumeKey(tmpDevice, "", 0, (cryptsetup.CRYPT_ACTIVATE_PRIVATE | cryptsetup.CRYPT_ACTIVATE_NO_JOURNAL)); err != nil {
|
||||
return fmt.Errorf("trying to activate temporary dm-crypt volume: %w", err)
|
||||
}
|
||||
|
||||
// No terminal available, limit callbacks to once every 30 seconds to not fill up logs with large amount of progress updates
|
||||
ticker := time.NewTicker(30 * time.Second)
|
||||
firstReq := make(chan struct{}, 1)
|
||||
firstReq <- struct{}{}
|
||||
defer ticker.Stop()
|
||||
|
||||
logProgress := func(size, offset uint64) {
|
||||
prog := (float64(offset) / float64(size)) * 100
|
||||
fmt.Printf("Wipe in progress: %.2f%%\n", prog)
|
||||
}
|
||||
|
||||
progressCallback := func(size, offset uint64) int {
|
||||
select {
|
||||
case <-firstReq:
|
||||
logProgress(size, offset)
|
||||
case <-ticker.C:
|
||||
logProgress(size, offset)
|
||||
default:
|
||||
}
|
||||
|
||||
return 0
|
||||
}
|
||||
|
||||
// Wipe the device using the same options as used in cryptsetup: https://gitlab.com/cryptsetup/cryptsetup/-/blob/v2.4.3/src/cryptsetup.c#L1345
|
||||
if err := device.Wipe(cryptPrefix+tmpDevice, cryptsetup.CRYPT_WIPE_ZERO, 0, 0, 1024*1024, 0, progressCallback); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Deactivate the temporary device
|
||||
if err := device.Deactivate(tmpDevice); err != nil {
|
||||
return fmt.Errorf("deactivating temporary volume: %w", err)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func resizeCryptDevice(ctx context.Context, device deviceMapper, name string,
|
||||
getKey func(ctx context.Context, keyID string, keySize int) ([]byte, error),
|
||||
) error {
|
||||
packageLock.Lock()
|
||||
defer packageLock.Unlock()
|
||||
|
||||
if err := device.InitByName(name); err != nil {
|
||||
return fmt.Errorf("initializing device: %w", err)
|
||||
}
|
||||
defer device.Free()
|
||||
|
||||
if err := device.Load(cryptsetup.LUKS2{}); err != nil {
|
||||
return fmt.Errorf("loading device: %w", err)
|
||||
}
|
||||
|
||||
passphrase, err := getKey(ctx, device.GetUUID(), crypto.StateDiskKeyLength)
|
||||
if err != nil {
|
||||
return fmt.Errorf("getting key: %w", err)
|
||||
}
|
||||
|
||||
if err := device.ActivateByPassphrase("", 0, string(passphrase), cryptsetup.CRYPT_ACTIVATE_KEYRING_KEY|ccryptsetup.ReadWriteQueueBypass); err != nil {
|
||||
return fmt.Errorf("activating keyring for crypt device %q with passphrase: %w", name, err)
|
||||
}
|
||||
|
||||
if err := device.Resize(name, 0); err != nil {
|
||||
return fmt.Errorf("resizing device: %w", err)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func getDevicePath(device deviceMapper, name string) (string, error) {
|
||||
packageLock.Lock()
|
||||
defer packageLock.Unlock()
|
||||
|
||||
if err := device.InitByName(name); err != nil {
|
||||
return "", fmt.Errorf("initializing device: %w", err)
|
||||
}
|
||||
defer device.Free()
|
||||
|
||||
deviceName := device.GetDeviceName()
|
||||
if deviceName == "" {
|
||||
return "", errors.New("unable to determine device name")
|
||||
}
|
||||
return deviceName, nil
|
||||
}
|
||||
|
||||
// IsIntegrityFS checks if the fstype string contains an integrity suffix.
|
||||
// If yes, returns the trimmed fstype and true, fstype and false otherwise.
|
||||
func IsIntegrityFS(fstype string) (string, bool) {
|
||||
if strings.HasSuffix(fstype, integrityFSSuffix) {
|
||||
return strings.TrimSuffix(fstype, integrityFSSuffix), true
|
||||
}
|
||||
return fstype, false
|
||||
}
|
||||
77
csi/cryptmapper/cryptmapper_cross.go
Normal file
77
csi/cryptmapper/cryptmapper_cross.go
Normal file
@ -0,0 +1,77 @@
|
||||
//go:build !linux || !cgo
|
||||
|
||||
/*
|
||||
Copyright (c) Edgeless Systems GmbH
|
||||
|
||||
SPDX-License-Identifier: AGPL-3.0-only
|
||||
*/
|
||||
|
||||
package cryptmapper
|
||||
|
||||
import (
|
||||
"context"
|
||||
"errors"
|
||||
)
|
||||
|
||||
// deviceMapper is an interface for device mapper methods.
|
||||
type deviceMapper interface{}
|
||||
|
||||
// CryptDevice is a wrapper for cryptsetup.Device.
|
||||
type CryptDevice struct{}
|
||||
|
||||
// Init initializes a crypt device backed by 'devicePath'.
|
||||
// This function errors if CGO is disabled.
|
||||
func (c *CryptDevice) Init(_ string) error {
|
||||
return errors.New("using cryptmapper requires building with CGO")
|
||||
}
|
||||
|
||||
// InitByName initializes a crypt device from provided active device 'name'.
|
||||
// This function panics if CGO is disabled.
|
||||
func (c *CryptDevice) InitByName(_ string) error {
|
||||
return errors.New("using cryptmapper requires building with CGO")
|
||||
}
|
||||
|
||||
// Free releases crypt device context and used memory.
|
||||
// This function does nothing if CGO is disabled.
|
||||
func (c *CryptDevice) Free() bool {
|
||||
return false
|
||||
}
|
||||
|
||||
// CryptMapper manages dm-crypt volumes.
|
||||
type CryptMapper struct{}
|
||||
|
||||
// New initializes a new CryptMapper with the given kms client and key-encryption-key ID.
|
||||
// This function panics if CGO is disabled.
|
||||
func New(_ KeyCreator, _ deviceMapper) *CryptMapper {
|
||||
panic("CGO is disabled but requested CryptMapper instance")
|
||||
}
|
||||
|
||||
// CloseCryptDevice closes the crypt device mapped for volumeID.
|
||||
// This function errors if CGO is disabled.
|
||||
func (c *CryptMapper) CloseCryptDevice(_ string) error {
|
||||
return errors.New("using cryptmapper requires building with CGO")
|
||||
}
|
||||
|
||||
// OpenCryptDevice maps the volume at source to the crypt device identified by volumeID.
|
||||
// This function errors if CGO is disabled.
|
||||
func (c *CryptMapper) OpenCryptDevice(_ context.Context, _, _ string, _ bool) (string, error) {
|
||||
return "", errors.New("using cryptmapper requires building with CGO")
|
||||
}
|
||||
|
||||
// ResizeCryptDevice resizes the underlying crypt device and returns the mapped device path.
|
||||
// This function errors if CGO is disabled.
|
||||
func (c *CryptMapper) ResizeCryptDevice(_ context.Context, _ string) (string, error) {
|
||||
return "", errors.New("using cryptmapper requires building with CGO")
|
||||
}
|
||||
|
||||
// GetDevicePath returns the device path of a mapped crypt device.
|
||||
// This function errors if CGO is disabled.
|
||||
func (c *CryptMapper) GetDevicePath(_ string) (string, error) {
|
||||
return "", errors.New("using cryptmapper requires building with CGO")
|
||||
}
|
||||
|
||||
// IsIntegrityFS checks if the fstype string contains an integrity suffix.
|
||||
// This function does nothing if CGO is disabled.
|
||||
func IsIntegrityFS(_ string) (string, bool) {
|
||||
return "", false
|
||||
}
|
||||
@ -1,3 +1,5 @@
|
||||
//go:build linux && cgo
|
||||
|
||||
/*
|
||||
Copyright (c) Edgeless Systems GmbH
|
||||
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
//go:build integration
|
||||
//go:build integration && linux && cgo
|
||||
|
||||
/*
|
||||
Copyright (c) Edgeless Systems GmbH
|
||||
|
||||
Loading…
Reference in New Issue
Block a user