gardener · timuthy · Jul 13, 2020 · Jun 9, 2020
@@ -20,6 +20,9 @@ webhooks:
   objectSelector: {}
   namespaceSelector: {}
   sideEffects: None
+  {{- if semverCompare "<= 1.15-0" .Capabilities.KubeVersion.GitVersion -}}
+  timeoutSeconds: 10
+  {{- end -}}
   clientConfig:
     {{- if .Values.global.virtualGarden.enabled }}
     url: {{ printf "https://%s.%s/webhooks/validate" (include "name" .) (.Release.Namespace) }}
@@ -30,3 +33,30 @@ webhooks:
       path: /webhooks/validate
     {{- end }}
     caBundle: {{ required ".Values.webhookConfig.caBundle is required" (b64enc .Values.global.webhookConfig.caBundle) }}
+- name: secrets.validation.gcp.provider.extensions.gardener.cloud
+  rules:
+  - apiGroups:
+    - ""
+    apiVersions:
+    - v1
+    operations:
+    - UPDATE
+    resources:
+    - secrets
+  failurePolicy: Fail
+  objectSelector: {}
+  namespaceSelector: {}
+  sideEffects: None
+  {{- if semverCompare "<= 1.15-0" .Capabilities.KubeVersion.GitVersion -}}
+  timeoutSeconds: 10
+  {{- end -}}
+  clientConfig:
+    {{- if .Values.global.virtualGarden.enabled }}
+    url: {{ printf "https://%s.%s/webhooks/validate/secrets" (include "name" .) (.Release.Namespace) }}
+    {{- else }}
+    service:
+      namespace: {{ .Release.Namespace }}
+      name: {{ include "name" . }}
+      path: /webhooks/validate/secrets
+    {{- end }}
+    caBundle: {{ required ".Values.webhookConfig.caBundle is required" (b64enc .Values.global.webhookConfig.caBundle) }}
@@ -24,8 +24,10 @@ import (
 
 	controllercmd "github.com/gardener/gardener/extensions/pkg/controller/cmd"
 	"github.com/gardener/gardener/extensions/pkg/util"
+	"github.com/gardener/gardener/extensions/pkg/util/index"
 	webhookcmd "github.com/gardener/gardener/extensions/pkg/webhook/cmd"
 	"github.com/gardener/gardener/pkg/apis/core/install"
+	gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
 	"github.com/spf13/cobra"
 	componentbaseconfig "k8s.io/component-base/config"
 	logf "sigs.k8s.io/controller-runtime/pkg/log"
@@ -76,6 +78,13 @@ func NewAdmissionCommand(ctx context.Context) *cobra.Command {
 				return fmt.Errorf("could not update manager scheme: %v", err)
 			}
 
+			if err := mgr.GetFieldIndexer().IndexField(&gardencorev1beta1.SecretBinding{}, index.SecretRefNamespaceField, index.SecretRefNamespaceIndexerFunc); err != nil {
+				return err
+			}
+			if err := mgr.GetFieldIndexer().IndexField(&gardencorev1beta1.Shoot{}, index.SecretBindingNameField, index.SecretBindingNameIndexerFunc); err != nil {
+				return err
+			}
+
 			log.Info("Setting up webhook server")
 
 			if err := webhookOptions.Completed().AddToManager(mgr); err != nil {

@@ -0,0 +1,27 @@
+### admission-gcp
+
+`admission-gcp` is an admission webhook server which is responsible for the validation of the cloud provider (GCP in this case) specific fields and resources. The Gardener API server is cloud provider agnostic and it wouldn't be able to perform similar validation.
+
+Follow the steps below to run the admission webhook server locally.
+
+1. Start the Gardener API server. 
+
+    For details, check the Gardener [local setup](https://github.com/gardener/gardener/blob/master/docs/development/local_setup.md).
+
+1. Start the webhook server
+
+    Make sure that the `KUBECONFIG` environment variable is pointing to the local garden cluster.
+
+    ```bash
+    make start-admission
+    ```
+
+1. Setup the `ValidatingWebhookConfiguration`.
+
+    `hack/dev-setup-admission-gcp.sh` will configure the webhook Service which will allow the kube-apiserver of your local cluster to reach the webhook server. It will also apply the `ValidatingWebhookConfiguration` manifest.
+
+    ```bash
+    ./hack/dev-setup-admission-gcp.sh
+    ```
+
+You are now ready to experiment with the `admission-gcp` webhook server locally.
@@ -22,4 +22,24 @@ webhooks:
   sideEffects: None
   clientConfig:
     url: "https://localhost:9443/webhooks/validate"
-    caBundle: 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
+    caBundle: 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
+- name: secrets.validation.gcp.provider.extensions.gardener.cloud
+  rules:
+  - apiGroups:
+    - ""
+    apiVersions:
+    - v1
+    operations:
+    - UPDATE
+    resources:
+    - secrets
+  failurePolicy: Fail
+  objectSelector: {}
+  namespaceSelector: {}
+  sideEffects: None
+  clientConfig:
+    service:
+      namespace: garden
+      name: gardener-extension-admission-gcp
+      path: /webhooks/validate/secrets
+    caBundle: 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
@@ -1,22 +1,27 @@
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@@ -1,27 +1,27 @@
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+dKBFVbP/DG1sNJNc1QoTMciDqZWFPrfsBw3OUmUEHG2RvkqdBwFvPw==
 -----END RSA PRIVATE KEY-----
@@ -0,0 +1,64 @@
+#!/bin/bash
+#
+# Copyright (c) 2020 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+# Make it able to work on minikube and nodeless
+
+IP_ROUTE=$(ip route get 1)
+IP_ADDRESS=$(echo ${IP_ROUTE#*src} | awk '{print $1}')
+
+ADMISSION_SERVICE_NAME="gardener-extension-admission-gcp"
+ADMISSION_ENDPOINT_NAME="gardener-extension-admission-gcp"
+APISERVER_SERVICE_PORT=443
+
+if kubectl -n garden get service "$ADMISSION_SERVICE_NAME" &> /dev/null; then
+  kubectl -n garden delete service $ADMISSION_SERVICE_NAME
+fi
+if kubectl -n garden get endpoints "$ADMISSION_ENDPOINT_NAME" &> /dev/null; then
+  kubectl -n garden delete endpoints $ADMISSION_ENDPOINT_NAME
+fi
+
+cat <<EOF | kubectl apply -f -
+kind: Service
+apiVersion: v1
+metadata:
+  name: $ADMISSION_SERVICE_NAME
+  namespace: garden
+spec:
+  ports:
+  - protocol: TCP
+    port: 443
+    targetPort: 9443
+EOF
+
+cat <<EOF | kubectl apply -f -
+---
+kind: Endpoints
+apiVersion: v1
+metadata:
+  name: $ADMISSION_ENDPOINT_NAME
+  namespace: garden
+subsets:
+- addresses:
+  - ip: ${IP_ADDRESS}
+  ports:
+  - port: 9443
+EOF
+
+kubectl apply -f $(dirname $0)/../example/40-validatingwebhookconfiguration.yaml
@@ -17,13 +17,14 @@ package cmd
 import (
 	"github.com/gardener/gardener-extension-provider-gcp/pkg/admission/validator"
 
-	extensionwebhook "github.com/gardener/gardener/extensions/pkg/webhook"
+	extensionswebhook "github.com/gardener/gardener/extensions/pkg/webhook"
 	webhookcmd "github.com/gardener/gardener/extensions/pkg/webhook/cmd"
 )
 
 // GardenWebhookSwitchOptions are the webhookcmd.SwitchOptions for the admission webhooks.
 func GardenWebhookSwitchOptions() *webhookcmd.SwitchOptions {
 	return webhookcmd.NewSwitchOptions(
-		webhookcmd.Switch(extensionwebhook.ValidatorName, validator.New),
+		webhookcmd.Switch(extensionswebhook.ValidatorName, validator.New),
+		webhookcmd.Switch(validator.SecretsValidatorName, validator.NewSecretsWebhook),
 	)
 }
@@ -0,0 +1,76 @@
+// Copyright (c) 2020 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package validator
+
+import (
+	"context"
+	"fmt"
+
+	gcpvalidation "github.com/gardener/gardener-extension-provider-gcp/pkg/apis/gcp/validation"
+	"github.com/gardener/gardener-extension-provider-gcp/pkg/gcp"
+
+	secretutil "github.com/gardener/gardener/extensions/pkg/util/secret"
+	extensionswebhook "github.com/gardener/gardener/extensions/pkg/webhook"
+	corev1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/equality"
+	"k8s.io/apimachinery/pkg/runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+type secret struct {
+	client client.Client
+}
+
+// NewSecretValidator returns a new instance of a secret validator.
+func NewSecretValidator() extensionswebhook.Validator {
+	return &secret{}
+}
+
+// InjectClient injects the given client into the validator.
+func (s *secret) InjectClient(client client.Client) error {
+	s.client = client
+	return nil
+}
+
+// Validate checks whether the given new secret is in use by Shoot with provider.type=gcp
+// and if yes, it check whether the new secret contains a valid GCP service account.
+func (s *secret) Validate(ctx context.Context, newObj, oldObj runtime.Object) error {
+	secret, ok := newObj.(*corev1.Secret)
+	if !ok {
+		return fmt.Errorf("wrong object type %T", newObj)
+	}
+
+	if oldObj != nil {
+		oldSecret, ok := oldObj.(*corev1.Secret)
+		if !ok {
+			return fmt.Errorf("wrong object type %T for old object", oldObj)
+		}
+
+		if equality.Semantic.DeepEqual(secret.Data, oldSecret.Data) {
+			return nil
+		}
+	}
+
+	isInUse, err := secretutil.IsSecretInUseByShoot(ctx, s.client, secret, gcp.Type)
+	if err != nil {
+		return err
+	}
+
+	if !isInUse {
+		return nil
+	}
+
+	return gcpvalidation.ValidateCloudProviderSecret(secret)
+}