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kubeconfig.go
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kubeconfig.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package storage
import (
"context"
"fmt"
"net/url"
"time"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/validation/field"
genericapirequest "k8s.io/apiserver/pkg/endpoints/request"
"k8s.io/apiserver/pkg/registry/rest"
kubecorev1listers "k8s.io/client-go/listers/core/v1"
"github.com/gardener/gardener/pkg/api"
authenticationapi "github.com/gardener/gardener/pkg/apis/authentication"
authenticationvalidation "github.com/gardener/gardener/pkg/apis/authentication/validation"
"github.com/gardener/gardener/pkg/apis/core"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
gardencorev1beta1listers "github.com/gardener/gardener/pkg/client/core/listers/core/v1beta1"
gardenerutils "github.com/gardener/gardener/pkg/utils/gardener"
"github.com/gardener/gardener/pkg/utils/secrets"
)
// KubeconfigREST implements a RESTStorage for a kubeconfig request.
type KubeconfigREST struct {
// TODO(petersutter): Remove secretLister field from struct after v1.96 has been released, as the cluster CA should then only be read from the ConfigMap.
secretLister kubecorev1listers.SecretLister
internalSecretLister gardencorev1beta1listers.InternalSecretLister
configMapLister kubecorev1listers.ConfigMapLister
shootStorage getter
maxExpirationSeconds int64
gvk schema.GroupVersionKind
newObjectFunc func() runtime.Object
clientCertificateOrganization string
}
var (
_ = rest.NamedCreater(&KubeconfigREST{})
_ = rest.GroupVersionKindProvider(&KubeconfigREST{})
)
// New returns an instance of the object.
func (r *KubeconfigREST) New() runtime.Object {
return r.newObjectFunc()
}
// Destroy cleans up its resources on shutdown.
func (r *KubeconfigREST) Destroy() {
// Given that underlying store is shared with REST, we don't destroy it here explicitly.
}
// Create returns a kubeconfig request with kubeconfig based on
// - shoot's advertised addresses
// - shoot's certificate authority
// - user making the request
// - configured organization for the client certificate
func (r *KubeconfigREST) Create(ctx context.Context, name string, obj runtime.Object, createValidation rest.ValidateObjectFunc, _ *metav1.CreateOptions) (runtime.Object, error) {
if createValidation != nil {
if err := createValidation(ctx, obj.DeepCopyObject()); err != nil {
return nil, err
}
}
kubeconfigRequest := &authenticationapi.KubeconfigRequest{}
if err := api.Scheme.Convert(obj, kubeconfigRequest, nil); err != nil {
return nil, fmt.Errorf("failed converting %T to %T: %w", obj, kubeconfigRequest, err)
}
if errs := authenticationvalidation.ValidateKubeconfigRequest(kubeconfigRequest); len(errs) != 0 {
return nil, apierrors.NewInvalid(r.gvk.GroupKind(), "", errs)
}
userInfo, ok := genericapirequest.UserFrom(ctx)
if !ok {
return nil, apierrors.NewBadRequest("no user in context")
}
// prepare: get shoot object
shootObj, err := r.shootStorage.Get(ctx, name, &metav1.GetOptions{})
if err != nil {
return nil, err
}
shoot, ok := shootObj.(*core.Shoot)
if !ok {
return nil, apierrors.NewInternalError(fmt.Errorf("cannot convert to *core.Shoot object - got type %T", shootObj))
}
// filter only addresses that actually advertise the kube-apiserver
// it is possible that the list of addresses also include URLs like the shoot's issuer URL
var kubeAPIServerAddresses []core.ShootAdvertisedAddress
for _, addr := range shoot.Status.AdvertisedAddresses {
if addr.Name == v1beta1constants.AdvertisedAddressExternal ||
addr.Name == v1beta1constants.AdvertisedAddressInternal ||
addr.Name == v1beta1constants.AdvertisedAddressUnmanaged {
kubeAPIServerAddresses = append(kubeAPIServerAddresses, addr)
}
}
if len(kubeAPIServerAddresses) == 0 {
fieldErr := field.Invalid(field.NewPath("status", "status"), shoot.Status.AdvertisedAddresses, "no suitable advertised address for kube-apiserver found in .status.advertisedAddresses")
return nil, apierrors.NewInvalid(r.gvk.GroupKind(), shoot.Name, field.ErrorList{fieldErr})
}
// prepare: get cluster and client CA
caClientSecret, err := r.internalSecretLister.InternalSecrets(shoot.Namespace).Get(gardenerutils.ComputeShootProjectResourceName(shoot.Name, gardenerutils.ShootProjectSecretSuffixCAClient))
if err != nil {
return nil, apierrors.NewInternalError(fmt.Errorf("could not get client CA secret: %w", err))
}
clientCACertificate, err := secrets.LoadCertificate("", caClientSecret.Data[secrets.DataKeyPrivateKeyCA], caClientSecret.Data[secrets.DataKeyCertificateCA])
if err != nil {
return nil, apierrors.NewInternalError(fmt.Errorf("could not load client CA certificate from secret: %w", err))
}
var clusterCABundle []byte
caClusterConfigMap, err := r.configMapLister.ConfigMaps(shoot.Namespace).Get(gardenerutils.ComputeShootProjectResourceName(shoot.Name, gardenerutils.ShootProjectConfigMapSuffixCACluster))
// TODO(petersutter): Remove this fallback of reading the <shoot-name>.ca-cluster Secret after v1.96 has been released
if apierrors.IsNotFound(err) {
caClusterSecret, err := r.secretLister.Secrets(shoot.Namespace).Get(gardenerutils.ComputeShootProjectResourceName(shoot.Name, gardenerutils.ShootProjectSecretSuffixCACluster))
if err != nil {
return nil, apierrors.NewInternalError(fmt.Errorf("could not get cluster CA secret: %w", err))
}
clusterCABundle = caClusterSecret.Data[secrets.DataKeyCertificateCA]
} else if err != nil {
return nil, apierrors.NewInternalError(fmt.Errorf("could not get cluster CA config map: %w", err))
} else {
clusterCABundle = []byte(caClusterConfigMap.Data[secrets.DataKeyCertificateCA])
}
if len(clusterCABundle) == 0 {
return nil, apierrors.NewInternalError(fmt.Errorf("could not load cluster CA bundle"))
}
// generate kubeconfig with client certificate
if r.maxExpirationSeconds > 0 && kubeconfigRequest.Spec.ExpirationSeconds > r.maxExpirationSeconds {
kubeconfigRequest.Spec.ExpirationSeconds = r.maxExpirationSeconds
}
var (
validity = time.Duration(kubeconfigRequest.Spec.ExpirationSeconds) * time.Second
authName = fmt.Sprintf("%s--%s", shoot.Namespace, shoot.Name)
cpsc = secrets.ControlPlaneSecretConfig{
Name: authName,
CertificateSecretConfig: &secrets.CertificateSecretConfig{
CommonName: userInfo.GetName(),
Organization: []string{r.clientCertificateOrganization},
CertType: secrets.ClientCert,
Validity: &validity,
SigningCA: clientCACertificate,
},
}
)
for _, address := range kubeAPIServerAddresses {
u, err := url.Parse(address.URL)
if err != nil {
return nil, err
}
cpsc.KubeConfigRequests = append(cpsc.KubeConfigRequests, secrets.KubeConfigRequest{
ClusterName: fmt.Sprintf("%s-%s", authName, address.Name),
APIServerHost: u.Host,
CAData: clusterCABundle,
})
}
cp, err := cpsc.Generate()
if err != nil {
return nil, err
}
controlPlaneSecret := cp.(*secrets.ControlPlane)
// return generated kubeconfig in status
kubeconfigRequest.Status.Kubeconfig = controlPlaneSecret.Kubeconfig
kubeconfigRequest.Status.ExpirationTimestamp = metav1.Time{Time: controlPlaneSecret.Certificate.Certificate.NotAfter}
if err := api.Scheme.Convert(kubeconfigRequest, obj, nil); err != nil {
return nil, fmt.Errorf("failed converting %T to %T: %w", kubeconfigRequest, obj, err)
}
return obj, nil
}
// GroupVersionKind returns the GVK for the kubeconfig request type.
func (r *KubeconfigREST) GroupVersionKind(schema.GroupVersion) schema.GroupVersionKind {
return r.gvk
}
type getter interface {
Get(ctx context.Context, name string, options *metav1.GetOptions) (runtime.Object, error)
}