Fixing AliCloud KMS seal encryption/decryption (#5756)

* fixing seal encryption/decryption

* Address feedback.

Co-Authored-By: chrishoffman <christopher.hoffman@gmail.com>

vault/seal/alicloudkms/alicloudkms.go

@@ -2,6 +2,7 @@ package alicloudkms
 
 import (
 	"context"
+	"encoding/base64"
 	"errors"
 	"fmt"
 	"os"
@@ -64,13 +65,12 @@ func (k *AliCloudKMSSeal) SetConfig(config map[string]string) (map[string]string
 
 	region := ""
 	if k.client == nil {
-
 		// Check and set region.
 		region = os.Getenv("ALICLOUD_REGION")
 		if region == "" {
 			ok := false
 			if region, ok = config["region"]; !ok {
-				region = "us-east-1"
+				region = "cn-beijing"
 			}
 		}
 
@@ -129,6 +129,9 @@ func (k *AliCloudKMSSeal) SetConfig(config map[string]string) (map[string]string
 	if keyInfo == nil || keyInfo.KeyMetadata.KeyId == "" {
 		return nil, errors.New("no key information returned")
 	}
+
+	// Store the current key id. If using a key alias, this will point to the actual
+	// unique key that that was used for this encrypt operation.
 	k.currentKeyID.Store(keyInfo.KeyMetadata.KeyId)
 
 	// Map that holds non-sensitive configuration info
@@ -178,7 +181,7 @@ func (k *AliCloudKMSSeal) Encrypt(_ context.Context, plaintext []byte) (*physica
 
 	input := kms.CreateEncryptRequest()
 	input.KeyId = k.keyID
-	input.Plaintext = string(env.Key)
+	input.Plaintext = base64.StdEncoding.EncodeToString(env.Key)
 	input.Domain = k.domain
 
 	output, err := k.client.Encrypt(input)
@@ -208,7 +211,7 @@ func (k *AliCloudKMSSeal) Decrypt(_ context.Context, in *physical.EncryptedBlobI
 		return nil, fmt.Errorf("given input for decryption is nil")
 	}
 
-	// KeyID is not passed to this call because AWS handles this
+	// KeyID is not passed to this call because AliCloud handles this
 	// internally based on the metadata stored with the encrypted data
 	input := kms.CreateDecryptRequest()
 	input.CiphertextBlob = string(in.KeyInfo.WrappedKey)
@@ -219,8 +222,13 @@ func (k *AliCloudKMSSeal) Decrypt(_ context.Context, in *physical.EncryptedBlobI
 		return nil, errwrap.Wrapf("error decrypting data encryption key: {{err}}", err)
 	}
 
+	keyBytes, err := base64.StdEncoding.DecodeString(output.Plaintext)
+	if err != nil {
+		return nil, err
+	}
+
 	envInfo := &seal.EnvelopeInfo{
-		Key:        []byte(output.Plaintext),
+		Key:        keyBytes,
 		IV:         in.IV,
 		Ciphertext: in.Ciphertext,
 	}

vault/seal/alicloudkms/alicloudkms_acc_test.go

@@ -0,0 +1,48 @@
+package alicloudkms
+
+import (
+	"context"
+	"os"
+	"reflect"
+	"testing"
+
+	log "github.com/hashicorp/go-hclog"
+	"github.com/hashicorp/vault/helper/logging"
+)
+
+// This test executes real calls. The calls themselves should be free,
+// but the KMS key used is generally not free. Alibaba doesn't publish
+// the price but it can be assumed to be around $1/month because that's
+// what AWS charges for the same.
+//
+// To run this test, the following env variables need to be set:
+//   - VAULT_ALICLOUDKMS_SEAL_KEY_ID
+//   - ALICLOUD_REGION
+//   - ALICLOUD_ACCESS_KEY
+//   - ALICLOUD_SECRET_KEY
+func TestAccAliCloudKMSSeal_Lifecycle(t *testing.T) {
+	if os.Getenv("VAULT_ACC") == "" {
+		t.SkipNow()
+	}
+
+	s := NewSeal(logging.NewVaultLogger(log.Trace))
+	_, err := s.SetConfig(nil)
+	if err != nil {
+		t.Fatalf("err : %s", err)
+	}
+
+	input := []byte("foo")
+	swi, err := s.Encrypt(context.Background(), input)
+	if err != nil {
+		t.Fatalf("err: %s", err.Error())
+	}
+
+	pt, err := s.Decrypt(context.Background(), swi)
+	if err != nil {
+		t.Fatalf("err: %s", err.Error())
+	}
+
+	if !reflect.DeepEqual(input, pt) {
+		t.Fatalf("expected %s, got %s", input, pt)
+	}
+}