Add cloudprovidedkms provider support

staging/src/k8s.io/apiserver/pkg/server/options/encryptionconfig/config.go

@@ -36,10 +36,11 @@ import (
 )
 
 const (
-	aesCBCTransformerPrefixV1    = "k8s:enc:aescbc:v1:"
-	aesGCMTransformerPrefixV1    = "k8s:enc:aesgcm:v1:"
-	secretboxTransformerPrefixV1 = "k8s:enc:secretbox:v1:"
-	kmsTransformerPrefixV1       = "k8s:enc:kms:v1:"
+	aesCBCTransformerPrefixV1           = "k8s:enc:aescbc:v1:"
+	aesGCMTransformerPrefixV1           = "k8s:enc:aesgcm:v1:"
+	secretboxTransformerPrefixV1        = "k8s:enc:secretbox:v1:"
+	kmsTransformerPrefixV1              = "k8s:enc:kms:v1:"
+	cloudProvidedKMSTransformerPrefixV1 = "k8s:enc:cloudprovidedkms:v1:"
 )
 
 // GetTransformerOverrides returns the transformer overrides by reading and parsing the encryption provider configuration file
@@ -150,7 +151,6 @@ func GetPrefixTransformers(config *ResourceConfig) ([]value.PrefixTransformer, e
 			if found == true {
 				return nil, fmt.Errorf("more than one provider specified in a single element, should split into different list elements")
 			}
-
 			f, err := os.Open(provider.KMS.ConfigFile)
 			if err != nil {
 				return nil, fmt.Errorf("error opening KMS provider configuration file %q: %v", provider.KMS.ConfigFile, err)
@@ -163,7 +163,19 @@ func GetPrefixTransformers(config *ResourceConfig) ([]value.PrefixTransformer, e
 			if pluginFound == false {
 				return nil, fmt.Errorf("KMS plugin %q not found", provider.KMS.Name)
 			}
-			transformer, err = getEnvelopePrefixTransformer(provider.KMS, envelopeService)
+			transformer, err = getEnvelopePrefixTransformer(provider.KMS.CoreKMSConfig, envelopeService, kmsTransformerPrefixV1)
+			found = true
+		}
+
+		if provider.CloudProvidedKMS != nil {
+			if found == true {
+				return nil, fmt.Errorf("more than one provider specified in a single element, should split into different list elements")
+			}
+			envelopeService, err := KMSPluginRegistry.getCloudProvidedPlugin(provider.CloudProvidedKMS.Name)
+			if err != nil {
+				return nil, fmt.Errorf("could not configure Cloud-Provided KMS plugin %q, %v", provider.CloudProvidedKMS.Name, err)
+			}
+			transformer, err = getEnvelopePrefixTransformer(provider.CloudProvidedKMS.CoreKMSConfig, envelopeService, cloudProvidedKMSTransformerPrefixV1)
 			found = true
 		}
 
@@ -284,13 +296,13 @@ func GetSecretboxPrefixTransformer(config *SecretboxConfig) (value.PrefixTransfo
 
 // getEnvelopePrefixTransformer returns a prefix transformer from the provided config.
 // envelopeService is used as the root of trust.
-func getEnvelopePrefixTransformer(config *KMSConfig, envelopeService envelope.Service) (value.PrefixTransformer, error) {
+func getEnvelopePrefixTransformer(config *CoreKMSConfig, envelopeService envelope.Service, prefix string) (value.PrefixTransformer, error) {
 	envelopeTransformer, err := envelope.NewEnvelopeTransformer(envelopeService, config.CacheSize, aestransformer.NewCBCTransformer)
 	if err != nil {
 		return value.PrefixTransformer{}, err
 	}
 	return value.PrefixTransformer{
 		Transformer: envelopeTransformer,
-		Prefix:      []byte(kmsTransformerPrefixV1 + config.Name + ":"),
+		Prefix:      []byte(prefix + config.Name + ":"),
 	}, nil
 }

staging/src/k8s.io/apiserver/pkg/server/options/encryptionconfig/encryptionconfig_test.go

@@ -58,6 +58,9 @@ resources:
         name: testprovider
         configfile: testproviderconfig
         cachesize: 10
+    - cloudprovidedkms:
+        name: testprovider
+        cachesize: 10
     - aescbc:
         keys:
         - name: key1
@@ -97,6 +100,9 @@ resources:
           secret: c2VjcmV0IGlzIHNlY3VyZQ==
         - name: key2
           secret: dGhpcyBpcyBwYXNzd29yZA==
+    - cloudprovidedkms:
+        name: testprovider
+        cachesize: 10
     - identity: {}
 `
 
@@ -118,6 +124,9 @@ resources:
         configfile: testproviderconfig
         cachesize: 10
     - identity: {}
+    - cloudprovidedkms:
+        name: testprovider
+        cachesize: 10
     - secretbox:
         keys:
         - name: key1
@@ -141,6 +150,9 @@ resources:
         keys:
         - name: key1
           secret: YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXoxMjM0NTY=
+    - cloudprovidedkms:
+        name: testprovider
+        cachesize: 10
     - aescbc:
         keys:
         - name: key1
@@ -182,6 +194,45 @@ resources:
         - name: key2
           secret: dGhpcyBpcyBwYXNzd29yZA==
     - identity: {}
+    - cloudprovidedkms:
+        name: testprovider
+        cachesize: 10
+    - aesgcm:
+        keys:
+        - name: key1
+          secret: c2VjcmV0IGlzIHNlY3VyZQ==
+        - name: key2
+          secret: dGhpcyBpcyBwYXNzd29yZA==
+`
+
+	correctConfigWithCloudProvidedKMSFirst = `
+kind: EncryptionConfig
+apiVersion: v1
+resources:
+  - resources:
+    - secrets
+    providers:
+    - cloudprovidedkms:
+        name: testprovider
+        cachesize: 10
+    - kms:
+        name: testprovider
+        configfile: testproviderconfig
+        cachesize: 10
+    - secretbox:
+        keys:
+        - name: key1
+          secret: YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXoxMjM0NTY=
+    - aescbc:
+        keys:
+        - name: key1
+          secret: c2VjcmV0IGlzIHNlY3VyZQ==
+        - name: key2
+          secret: dGhpcyBpcyBwYXNzd29yZA==
+    - identity: {}
+    - cloudprovidedkms:
+        name: testprovider
+        cachesize: 10
     - aesgcm:
         keys:
         - name: key1
@@ -252,6 +303,12 @@ func TestEncryptionProviderConfigCorrect(t *testing.T) {
 	KMSPluginRegistry.Register(testEnvelopeServiceProviderName, func(config io.Reader) (envelope.Service, error) {
 		return &testEnvelopeService{}, nil
 	})
+	KMSPluginRegistry.RegisterCloudProvidedKMSPlugin(func(name string) (envelope.Service, error) {
+		if name == testEnvelopeServiceProviderName {
+			return &testEnvelopeService{}, nil
+		}
+		return nil, fmt.Errorf("no such cloud provided KMS plugin registered: %q", name)
+	})
 
 	// Creates compound/prefix transformers with different ordering of available transformers.
 	// Transforms data using one of them, and tries to untransform using the others.
@@ -281,12 +338,18 @@ func TestEncryptionProviderConfigCorrect(t *testing.T) {
 		t.Fatalf("error while parsing configuration file: %s.\nThe file was:\n%s", err, correctConfigWithKMSFirst)
 	}
 
+	cloudProvidedKMSFirstTransformerOverrides, err := ParseEncryptionConfiguration(strings.NewReader(correctConfigWithCloudProvidedKMSFirst))
+	if err != nil {
+		t.Fatalf("error while parsing configuration file: %s.\nThe file was:\n%s", err, correctConfigWithCloudProvidedKMSFirst)
+	}
+
 	// Pick the transformer for any of the returned resources.
 	identityFirstTransformer := identityFirstTransformerOverrides[schema.ParseGroupResource("secrets")]
 	aesGcmFirstTransformer := aesGcmFirstTransformerOverrides[schema.ParseGroupResource("secrets")]
 	aesCbcFirstTransformer := aesCbcFirstTransformerOverrides[schema.ParseGroupResource("secrets")]
 	secretboxFirstTransformer := secretboxFirstTransformerOverrides[schema.ParseGroupResource("secrets")]
 	kmsFirstTransformer := kmsFirstTransformerOverrides[schema.ParseGroupResource("secrets")]
+	cloudProvidedKMSFirstTransformer := cloudProvidedKMSFirstTransformerOverrides[schema.ParseGroupResource("secrets")]
 
 	context := value.DefaultContext([]byte(sampleContextText))
 	originalText := []byte(sampleText)
@@ -300,6 +363,7 @@ func TestEncryptionProviderConfigCorrect(t *testing.T) {
 		{secretboxFirstTransformer, "secretboxFirst"},
 		{identityFirstTransformer, "identityFirst"},
 		{kmsFirstTransformer, "kmsFirst"},
+		{cloudProvidedKMSFirstTransformer, "cloudProvidedKMSFirst"},
 	}
 
 	for _, testCase := range transformers {

staging/src/k8s.io/apiserver/pkg/server/options/encryptionconfig/plugins.go

@@ -18,6 +18,7 @@ package encryptionconfig
 
 import (
 	"bytes"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"reflect"
@@ -112,6 +113,9 @@ func (ps *KMSPlugins) fetchPluginFromRegistry(name string) (Factory, bool) {
 
 // getCloudProvidedPlugin creates an instance of the named cloud provided KMS plugin.
 func (ps *KMSPlugins) getCloudProvidedPlugin(name string) (envelope.Service, error) {
+	if ps.cloudKMS == nil {
+		return nil, fmt.Errorf("no cloud registered for KMS plugins")
+	}
 	return ps.cloudKMS(name)
 }
 

staging/src/k8s.io/apiserver/pkg/server/options/encryptionconfig/types.go

@@ -45,8 +45,11 @@ type ProviderConfig struct {
 	Secretbox *SecretboxConfig `json:"secretbox,omitempty"`
 	// identity is the (empty) configuration for the identity transformer.
 	Identity *IdentityConfig `json:"identity,omitempty"`
-	// kms contains the name and path to configuration file for a KMS based envelope transformer.
+	// kms contains the name, cache size and path to configuration file for a KMS based envelope transformer.
 	KMS *KMSConfig `json:"kms,omitempty"`
+	// cloudProvidedKMSConfig contains the name and cache size for a KMS based envelope transformer which uses
+	// the KMS provided by the cloud.
+	CloudProvidedKMS *CloudProvidedKMSConfig `json:"cloudprovidedkms,omitempty"`
 }
 
 // AESConfig contains the API configuration for an AES transformer.
@@ -74,13 +77,24 @@ type Key struct {
 // IdentityConfig is an empty struct to allow identity transformer in provider configuration.
 type IdentityConfig struct{}
 
-// KMS contains the name and path to configuration file for a KMS based envelope transformer.
-type KMSConfig struct {
+// CoreKMSConfig contains the name and cache sized for a KMS based envelope transformer.
+type CoreKMSConfig struct {
 	// name is the name of the KMS plugin to be used.
 	Name string `json:"name"`
 	// cacheSize is the maximum number of secrets which are cached in memory. The default value is 1000.
 	// +optional
 	CacheSize int `json:"cachesize,omitempty"`
+}
+
+// KMSConfig contains the name, cache size and path to configuration file for a KMS based envelope transformer.
+type KMSConfig struct {
+	*CoreKMSConfig
 	// configfile is the path to the configuration file for the named KMS provider.
 	ConfigFile string `json:"configfile"`
 }
+
+// CloudProvidedKMSConfig contains the name and cache size for a KMS based envelope transformer which uses
+// the KMS provided by the cloud.
+type CloudProvidedKMSConfig struct {
+	*CoreKMSConfig
+}