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handler.go
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/
handler.go
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// Copyright 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 internaldomainsecret
import (
"context"
"fmt"
"time"
"github.com/go-logr/logr"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
gardencore "github.com/gardener/gardener/pkg/apis/core"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
gardenerutils "github.com/gardener/gardener/pkg/utils/gardener"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
)
// Handler validates the immutability of the internal domain secret.
type Handler struct {
Logger logr.Logger
APIReader client.Reader
}
// ValidateCreate performs the check.
func (h *Handler) ValidateCreate(ctx context.Context, obj runtime.Object) (admission.Warnings, error) {
ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
defer cancel()
secret, ok := obj.(*corev1.Secret)
if !ok {
return nil, apierrors.NewBadRequest(fmt.Sprintf("expected *corev1.Secret but got %T", obj))
}
seedName := gardenerutils.ComputeSeedName(secret.Namespace)
if secret.Namespace != v1beta1constants.GardenNamespace && seedName == "" {
return nil, nil
}
exists, err := h.internalDomainSecretExists(ctx, secret.Namespace)
if err != nil {
return nil, apierrors.NewInternalError(err)
}
if exists {
return nil, apierrors.NewConflict(schema.GroupResource{Group: corev1.GroupName, Resource: "Secret"}, secret.Name, fmt.Errorf("cannot create internal domain secret because there can be only one secret with the 'internal-domain' secret role per namespace"))
}
if _, _, _, err := gardenerutils.GetDomainInfoFromAnnotations(secret.Annotations); err != nil {
return nil, apierrors.NewBadRequest(err.Error())
}
return nil, nil
}
// ValidateUpdate performs the check.
func (h *Handler) ValidateUpdate(ctx context.Context, oldObj, newObj runtime.Object) (admission.Warnings, error) {
ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
defer cancel()
secret, ok := newObj.(*corev1.Secret)
if !ok {
return nil, apierrors.NewBadRequest(fmt.Sprintf("expected *corev1.Secret but got %T", newObj))
}
oldSecret, ok := oldObj.(*corev1.Secret)
if !ok {
return nil, apierrors.NewBadRequest(fmt.Sprintf("expected *corev1.Secret but got %T", oldObj))
}
seedName := gardenerutils.ComputeSeedName(secret.Namespace)
if secret.Namespace != v1beta1constants.GardenNamespace && seedName == "" {
return nil, nil
}
// If secret was newly labeled with gardener.cloud/role=internal-domain then check whether another internal domain
// secret already exists.
if oldSecret.Labels[v1beta1constants.GardenRole] != v1beta1constants.GardenRoleInternalDomain &&
secret.Labels[v1beta1constants.GardenRole] == v1beta1constants.GardenRoleInternalDomain {
exists, err := h.internalDomainSecretExists(ctx, secret.Namespace)
if err != nil {
return nil, apierrors.NewInternalError(err)
}
if exists {
return nil, apierrors.NewConflict(schema.GroupResource{Group: corev1.GroupName, Resource: "Secret"}, secret.Name, fmt.Errorf("cannot update secret because there can be only one secret with the 'internal-domain' secret role per namespace"))
}
}
_, oldDomain, _, err := gardenerutils.GetDomainInfoFromAnnotations(oldSecret.Annotations)
if err != nil {
return nil, apierrors.NewInternalError(err)
}
_, newDomain, _, err := gardenerutils.GetDomainInfoFromAnnotations(secret.Annotations)
if err != nil {
return nil, apierrors.NewInternalError(err)
}
if oldDomain != newDomain {
atLeastOneShoot, err := h.atLeastOneShootExists(ctx, seedName)
if err != nil {
return nil, apierrors.NewInternalError(err)
}
if atLeastOneShoot {
return nil, apierrors.NewForbidden(schema.GroupResource{Group: corev1.GroupName, Resource: "Secret"}, secret.Name, fmt.Errorf("cannot change domain because there are still shoots left in the system"))
}
}
return nil, nil
}
// ValidateDelete performs the check.
func (h *Handler) ValidateDelete(ctx context.Context, obj runtime.Object) (admission.Warnings, error) {
ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
defer cancel()
secret, ok := obj.(*corev1.Secret)
if !ok {
return nil, apierrors.NewBadRequest(fmt.Sprintf("expected *corev1.Secret but got %T", obj))
}
seedName := gardenerutils.ComputeSeedName(secret.Namespace)
if secret.Namespace != v1beta1constants.GardenNamespace && seedName == "" {
return nil, nil
}
atLeastOneShoot, err := h.atLeastOneShootExists(ctx, seedName)
if err != nil {
return nil, apierrors.NewInternalError(err)
}
if atLeastOneShoot {
return nil, apierrors.NewForbidden(schema.GroupResource{Group: corev1.GroupName, Resource: "Secret"}, secret.Name, fmt.Errorf("cannot delete internal domain secret because there are still shoots left in the system"))
}
return nil, nil
}
func (h *Handler) atLeastOneShootExists(ctx context.Context, seedName string) (bool, error) {
var listOpts []client.ListOption
if seedName != "" {
listOpts = append(listOpts, client.MatchingFields{
gardencore.ShootSeedName: seedName,
})
}
return kubernetesutils.ResourcesExist(ctx, h.APIReader, gardencorev1beta1.SchemeGroupVersion.WithKind("ShootList"), listOpts...)
}
func (h *Handler) internalDomainSecretExists(ctx context.Context, namespace string) (bool, error) {
return kubernetesutils.ResourcesExist(ctx, h.APIReader, corev1.SchemeGroupVersion.WithKind("SecretList"), client.InNamespace(namespace), client.MatchingLabels{
v1beta1constants.GardenRole: v1beta1constants.GardenRoleInternalDomain,
})
}