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ingress.go
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ingress.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 apiserverexposure
import (
"context"
"fmt"
istioapinetworkingv1beta1 "istio.io/api/networking/v1beta1"
istionetworkingv1beta1 "istio.io/client-go/pkg/apis/networking/v1beta1"
corev1 "k8s.io/api/core/v1"
networkingv1 "k8s.io/api/networking/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/utils/ptr"
"sigs.k8s.io/controller-runtime/pkg/client"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/component"
kubeapiserverconstants "github.com/gardener/gardener/pkg/component/kubernetes/apiserver/constants"
"github.com/gardener/gardener/pkg/controllerutils"
gardenerutils "github.com/gardener/gardener/pkg/utils/gardener"
"github.com/gardener/gardener/pkg/utils/istio"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
)
// IngressValues configure the kube-apiserver ingress.
type IngressValues struct {
// Host is the host where the kube-apiserver should be exposed.
Host string
// IstioIngressGatewayLabelsFunc is a function returingin the labels identifying the corresponding istio ingress gateway.
IstioIngressGatewayLabelsFunc func() map[string]string
// IstioIngressGatewayNamespaceFunc is a function returning the namespace of the corresponding istio ingress gateway.
IstioIngressGatewayNamespaceFunc func() string
// ServiceName is the name of the service the ingress is using.
ServiceName string
// ServiceNamespace is the namespace of the service the ingress is using.
ServiceNamespace string
// TLSSecretName is the name of the TLS secret.
// If no secret is provided TLS is not terminated by nginx.
TLSSecretName *string
}
// NewIngress creates a new instance of Deployer for the ingress used to expose the kube-apiserver.
func NewIngress(c client.Client, namespace string, values IngressValues) component.Deployer {
return &ingress{client: c, namespace: namespace, values: values}
}
type ingress struct {
client client.Client
namespace string
values IngressValues
}
func (i *ingress) Deploy(ctx context.Context) error {
destinationRule := i.emptyDestinationRule()
gateway := i.emptyGateway()
virtualService := i.emptyVirtualService()
tlsMode := istioapinetworkingv1beta1.ClientTLSSettings_DISABLE
if i.values.TLSSecretName != nil {
tlsMode = istioapinetworkingv1beta1.ClientTLSSettings_SIMPLE
}
serviceNamespace := i.namespace
if i.values.ServiceNamespace != "" {
serviceNamespace = i.values.ServiceNamespace
}
destinationHost := kubernetesutils.FQDNForService(i.values.ServiceName, serviceNamespace)
if _, err := controllerutils.GetAndCreateOrMergePatch(ctx, i.client, destinationRule, istio.DestinationRuleWithLocalityPreferenceAndTLS(destinationRule, getLabels(), destinationHost, tlsMode)); err != nil {
return err
}
if i.values.TLSSecretName != nil {
// Istio expects the secret in the istio ingress gateway namespace => copy certifcate to istio namespace
wildcardCert, err := gardenerutils.GetWildcardCertificate(ctx, i.client)
if err != nil {
return err
}
if wildcardCert == nil {
return fmt.Errorf("wildcard secret '%s' not found in garden namespace", *i.values.TLSSecretName)
}
wildcardSecret := i.emptyWildcardSecret()
if _, err := controllerutils.GetAndCreateOrMergePatch(ctx, i.client, wildcardSecret, func() error {
wildcardSecret.Data = wildcardCert.Data
return nil
}); err != nil {
return err
}
if _, err := controllerutils.GetAndCreateOrMergePatch(ctx, i.client, gateway, istio.GatewayWithTLSTermination(gateway, getLabels(), i.values.IstioIngressGatewayLabelsFunc(), []string{i.values.Host}, kubeapiserverconstants.Port, ptr.Deref(i.values.TLSSecretName, ""))); err != nil {
return err
}
if _, err := controllerutils.GetAndCreateOrMergePatch(ctx, i.client, virtualService, func() error {
if err := istio.VirtualServiceWithSNIMatch(virtualService, getLabels(), []string{i.values.Host}, gateway.Name, kubeapiserverconstants.Port, destinationHost)(); err != nil {
return err
}
virtualService.Spec.Http = []*istioapinetworkingv1beta1.HTTPRoute{{
Match: []*istioapinetworkingv1beta1.HTTPMatchRequest{{
Uri: &istioapinetworkingv1beta1.StringMatch{
MatchType: &istioapinetworkingv1beta1.StringMatch_Prefix{Prefix: "/"},
},
}},
Route: []*istioapinetworkingv1beta1.HTTPRouteDestination{{
Destination: &istioapinetworkingv1beta1.Destination{
Host: destinationHost,
Port: &istioapinetworkingv1beta1.PortSelector{
Number: kubeapiserverconstants.Port,
},
},
}},
}}
return nil
}); err != nil {
return err
}
} else {
if _, err := controllerutils.GetAndCreateOrMergePatch(ctx, i.client, gateway, istio.GatewayWithTLSPassthrough(gateway, getLabels(), i.values.IstioIngressGatewayLabelsFunc(), []string{i.values.Host}, kubeapiserverconstants.Port)); err != nil {
return err
}
if _, err := controllerutils.GetAndCreateOrMergePatch(ctx, i.client, virtualService, istio.VirtualServiceWithSNIMatch(virtualService, getLabels(), []string{i.values.Host}, gateway.Name, kubeapiserverconstants.Port, destinationHost)); err != nil {
return err
}
}
// TODO(scheererj): Drop this after v1.92
return kubernetesutils.DeleteObjects(ctx, i.client, i.emptyIngress())
}
func (i *ingress) Destroy(ctx context.Context) error {
objects := []client.Object{
// TODO(scheererj): Drop ingress after v1.92
i.emptyIngress(),
i.emptyDestinationRule(),
i.emptyGateway(),
i.emptyVirtualService(),
}
if i.values.TLSSecretName != nil && i.values.IstioIngressGatewayNamespaceFunc != nil {
objects = append(objects, i.emptyWildcardSecret())
}
return kubernetesutils.DeleteObjects(ctx, i.client, objects...)
}
func (i *ingress) emptyIngress() *networkingv1.Ingress {
return &networkingv1.Ingress{ObjectMeta: metav1.ObjectMeta{Name: v1beta1constants.DeploymentNameKubeAPIServer, Namespace: i.namespace}}
}
func (i *ingress) emptyDestinationRule() *istionetworkingv1beta1.DestinationRule {
serviceNamespace := i.namespace
if i.values.ServiceNamespace != "" {
serviceNamespace = i.values.ServiceNamespace
}
return &istionetworkingv1beta1.DestinationRule{ObjectMeta: metav1.ObjectMeta{Name: v1beta1constants.DeploymentNameKubeAPIServer + "-ingress", Namespace: serviceNamespace}}
}
func (i *ingress) emptyGateway() *istionetworkingv1beta1.Gateway {
return &istionetworkingv1beta1.Gateway{ObjectMeta: metav1.ObjectMeta{Name: v1beta1constants.DeploymentNameKubeAPIServer + "-ingress", Namespace: i.namespace}}
}
func (i *ingress) emptyVirtualService() *istionetworkingv1beta1.VirtualService {
return &istionetworkingv1beta1.VirtualService{ObjectMeta: metav1.ObjectMeta{Name: v1beta1constants.DeploymentNameKubeAPIServer + "-ingress", Namespace: i.namespace}}
}
func (i *ingress) emptyWildcardSecret() *corev1.Secret {
return &corev1.Secret{ObjectMeta: metav1.ObjectMeta{Name: *i.values.TLSSecretName, Namespace: i.values.IstioIngressGatewayNamespaceFunc()}}
}