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util: Make encryption passphrase size a parameter

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fscrypt support requires keys longer than 20 bytes. As a preparation,
make the new passphrase length configurable, but default to 20 bytes.

Signed-off-by: Marcel Lauhoff <marcel.lauhoff@suse.com>
This commit is contained in:
Marcel Lauhoff 2022-02-11 16:30:23 +01:00 committed by mergify[bot]
parent 69eb6e40dc
commit fe4821435e
3 changed files with 11 additions and 9 deletions
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4
internal/rbd/encryption.go
View File

@ -61,6 +61,8 @@ const (
// DEK is stored.
metadataDEK = "rbd.csi.ceph.com/dek"
oldMetadataDEK = ".rbd.csi.ceph.com/dek"
encryptionPassphraseSize = 20
)
// checkRbdImageEncrypted verifies if rbd image was encrypted when created.
@ -100,7 +102,7 @@ func (ri *rbdImage) isEncrypted() bool {
// - the Data-Encryption-Key (DEK) will be generated stored for use by the KMS;
// - the RBD image will be marked to support encryption in its metadata.
func (ri *rbdImage) setupEncryption(ctx context.Context) error {
err := ri.encryption.StoreNewCryptoPassphrase(ri.VolID)
err := ri.encryption.StoreNewCryptoPassphrase(ri.VolID, encryptionPassphraseSize)
if err != nil {
log.ErrorLog(ctx, "failed to save encryption passphrase for "+
"image %s: %s", ri, err)

10
internal/util/crypto.go
View File

@ -36,7 +36,7 @@ const (
// Passphrase size - 20 bytes is 160 bits to satisfy:
// https://tools.ietf.org/html/rfc6749#section-10.10
encryptionPassphraseSize = 20
defaultEncryptionPassphraseSize = 20
)
var (
@ -156,8 +156,8 @@ func (ve *VolumeEncryption) StoreCryptoPassphrase(volumeID, passphrase string) e
}
// StoreNewCryptoPassphrase generates a new passphrase and saves it in the KMS.
func (ve *VolumeEncryption) StoreNewCryptoPassphrase(volumeID string) error {
passphrase, err := generateNewEncryptionPassphrase()
func (ve *VolumeEncryption) StoreNewCryptoPassphrase(volumeID string, length int) error {
passphrase, err := generateNewEncryptionPassphrase(length)
if err != nil {
return fmt.Errorf("failed to generate passphrase for %s: %w", volumeID, err)
}
@ -176,8 +176,8 @@ func (ve *VolumeEncryption) GetCryptoPassphrase(volumeID string) (string, error)
}
// generateNewEncryptionPassphrase generates a random passphrase for encryption.
func generateNewEncryptionPassphrase() (string, error) {
bytesPassphrase := make([]byte, encryptionPassphraseSize)
func generateNewEncryptionPassphrase(length int) (string, error) {
bytesPassphrase := make([]byte, length)
_, err := rand.Read(bytesPassphrase)
if err != nil {
return "", err

6
internal/util/crypto_test.go
View File

@ -28,14 +28,14 @@ import (
func TestGenerateNewEncryptionPassphrase(t *testing.T) {
t.Parallel()
b64Passphrase, err := generateNewEncryptionPassphrase()
b64Passphrase, err := generateNewEncryptionPassphrase(defaultEncryptionPassphraseSize)
require.NoError(t, err)
// b64Passphrase is URL-encoded, decode to verify the length of the
// passphrase
passphrase, err := base64.URLEncoding.DecodeString(b64Passphrase)
assert.NoError(t, err)
assert.Equal(t, encryptionPassphraseSize, len(passphrase))
assert.Equal(t, defaultEncryptionPassphraseSize, len(passphrase))
}
func TestKMSWorkflow(t *testing.T) {
@ -56,7 +56,7 @@ func TestKMSWorkflow(t *testing.T) {
volumeID := "volume-id"
err = ve.StoreNewCryptoPassphrase(volumeID)
err = ve.StoreNewCryptoPassphrase(volumeID, defaultEncryptionPassphraseSize)
assert.NoError(t, err)
passphrase, err := ve.GetCryptoPassphrase(volumeID)