/
handler.go
69 lines (56 loc) · 2.31 KB
/
handler.go
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// Copyright (c) 2021 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 tokeninvalidator
import (
"bytes"
"context"
"fmt"
"github.com/go-logr/logr"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
resourcesv1alpha1 "github.com/gardener/gardener/pkg/apis/resources/v1alpha1"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
)
// Handler handles admission requests and invalidates the static token in Secret resources related to ServiceAccounts.
type Handler struct {
Logger logr.Logger
}
// Default invalidates the static token in Secret resources related to ServiceAccounts.
func (h *Handler) Default(ctx context.Context, obj runtime.Object) error {
secret, ok := obj.(*corev1.Secret)
if !ok {
return fmt.Errorf("expected *corev1.Secret but got %T", obj)
}
req, err := admission.RequestFromContext(ctx)
if err != nil {
return err
}
log := h.Logger.WithValues("secret", kubernetesutils.ObjectKeyForCreateWebhooks(secret, req))
if secret.Data == nil {
log.Info("Secret's data is nil, nothing to be done")
return nil
}
switch {
case metav1.HasLabel(secret.ObjectMeta, resourcesv1alpha1.StaticTokenConsider):
log.Info("Secret has 'consider' label, invalidating token")
secret.Data[corev1.ServiceAccountTokenKey] = invalidToken
case bytes.Equal(secret.Data[corev1.ServiceAccountTokenKey], invalidToken):
log.Info("Secret has invalidated token and no 'consider' label, regenerating token")
delete(secret.Data, corev1.ServiceAccountTokenKey)
}
return nil
}
var invalidToken = []byte("\u0000\u0000\u0000")