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actuator.go
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actuator.go
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// Copyright (c) 2019 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 controller
import (
"context"
"crypto/sha256"
"embed"
"encoding/base32"
"encoding/json"
"fmt"
"net"
"strings"
"time"
"github.com/gardener/gardener/extensions/pkg/controller"
"github.com/gardener/gardener/extensions/pkg/controller/extension"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
"github.com/gardener/gardener/pkg/chartrenderer"
"github.com/gardener/gardener/pkg/utils/chart"
managedresources "github.com/gardener/gardener/pkg/utils/managedresources"
"github.com/go-logr/logr"
"github.com/pkg/errors"
"github.com/stackitcloud/gardener-extension-acl/charts"
"github.com/stackitcloud/gardener-extension-acl/pkg/controller/config"
"github.com/stackitcloud/gardener-extension-acl/pkg/envoyfilters"
"github.com/stackitcloud/gardener-extension-acl/pkg/helper"
"github.com/stackitcloud/gardener-extension-acl/pkg/imagevector"
istionetworkingClientGo "istio.io/client-go/pkg/apis/networking/v1alpha3"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/rest"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/manager"
)
const (
// ActuatorName is only used for the logger instance
ActuatorName = "acl-actuator"
ResourceNameSeed = "acl-seed"
ChartNameSeed = "seed"
IngressNamespace = "istio-ingress"
HashAnnotationName = "acl-ext-rule-hash"
// ImageName is used for the image vector override.
// This is currently not implemented correctly.
// TODO implement
ImageName = "image-name"
deletionTimeout = 2 * time.Minute
OpenstackTypeName = "openstack"
)
var (
ErrSpecAction = errors.New("action must either be 'ALLOW' or 'DENY'")
ErrSpecRule = errors.New("rule must be present")
ErrSpecType = errors.New("type must either be 'direct_remote_ip', 'remote_ip' or 'source_ip'")
ErrSpecCIDR = errors.New("CIDRs must not be empty")
ErrNoExtensionsFound = errors.New("could not list any extensions")
ErrNoAdvertisedAddresses = errors.New("advertised addresses are not available, likely because cluster creation has not yet completed")
)
// NewActuator returns an actuator responsible for Extension resources.
func NewActuator(mgr manager.Manager, cfg config.Config) extension.Actuator {
return &actuator{
extensionConfig: cfg,
envoyfilterService: envoyfilters.EnvoyFilterService{},
client: mgr.GetClient(),
config: mgr.GetConfig(),
decoder: serializer.NewCodecFactory(mgr.GetScheme(), serializer.EnableStrict).UniversalDecoder(),
}
}
type actuator struct {
client client.Client
config *rest.Config
decoder runtime.Decoder
extensionConfig config.Config
envoyfilterService envoyfilters.EnvoyFilterService
}
type ExtensionSpec struct {
// Rule contain the user-defined Access Control Rule
Rule *envoyfilters.ACLRule `json:"rule"`
}
// Reconcile the Extension resource.
func (a *actuator) Reconcile(ctx context.Context, log logr.Logger, ex *extensionsv1alpha1.Extension) error {
cluster, err := helper.GetClusterForExtension(ctx, a.client, ex)
if err != nil {
return err
}
extSpec := &ExtensionSpec{}
if ex.Spec.ProviderConfig != nil && ex.Spec.ProviderConfig.Raw != nil {
if err := json.Unmarshal(ex.Spec.ProviderConfig.Raw, &extSpec); err != nil {
return err
}
}
if err := ValidateExtensionSpec(extSpec); err != nil {
return err
}
if err := a.updateEnvoyFilterHash(ctx, ex.GetNamespace(), extSpec, false); err != nil {
return err
}
hosts := make([]string, 0)
if cluster.Shoot.Status.AdvertisedAddresses == nil || len(cluster.Shoot.Status.AdvertisedAddresses) < 1 {
return ErrNoAdvertisedAddresses
}
for _, address := range cluster.Shoot.Status.AdvertisedAddresses {
hosts = append(hosts, strings.Split(address.URL, "//")[1])
}
var shootSpecificCIDRs []string
var alwaysAllowedCIDRs []string
alwaysAllowedCIDRs = append(alwaysAllowedCIDRs, helper.GetSeedSpecificAllowedCIDRs(cluster.Seed)...)
if len(a.extensionConfig.AdditionalAllowedCidrs) >= 1 {
alwaysAllowedCIDRs = append(alwaysAllowedCIDRs, a.extensionConfig.AdditionalAllowedCidrs...)
}
shootSpecificCIDRs = append(shootSpecificCIDRs, helper.GetShootNodeSpecificAllowedCIDRs(cluster.Shoot)...)
infra, err := helper.GetInfrastructureForExtension(ctx, a.client, ex, cluster.Shoot.Name)
if err != nil {
return err
}
providerSpecificCIRDs, err := helper.GetProviderSpecificAllowedCIDRs(infra)
if err != nil {
return err
}
shootSpecificCIDRs = append(shootSpecificCIDRs, providerSpecificCIRDs...)
if err := a.createSeedResources(
ctx,
log,
ex.GetNamespace(),
extSpec,
cluster,
hosts,
shootSpecificCIDRs,
alwaysAllowedCIDRs,
); err != nil {
return err
}
if err := a.reconcileVPNEnvoyFilter(ctx, alwaysAllowedCIDRs); err != nil {
return err
}
return a.updateStatus(ctx, ex, extSpec)
}
func ValidateExtensionSpec(spec *ExtensionSpec) error {
rule := spec.Rule
if rule == nil {
return ErrSpecRule
}
// action
a := strings.ToLower(rule.Action)
if a != "allow" && a != "deny" {
return ErrSpecAction
}
// type
t := strings.ToLower(rule.Type)
if t != "direct_remote_ip" &&
t != "remote_ip" &&
t != "source_ip" {
return ErrSpecType
}
// cidrs
if len(rule.Cidrs) < 1 {
return ErrSpecCIDR
}
for ii := range rule.Cidrs {
_, mask, err := net.ParseCIDR(rule.Cidrs[ii])
if err != nil {
return err
}
if mask == nil {
return ErrSpecCIDR
}
}
return nil
}
// Delete the Extension resource.
func (a *actuator) Delete(ctx context.Context, log logr.Logger, ex *extensionsv1alpha1.Extension) error {
namespace := ex.GetNamespace()
log.Info("Component is being deleted", "component", "", "namespace", namespace)
if err := a.updateEnvoyFilterHash(ctx, namespace, nil, true); err != nil {
return err
}
return a.deleteSeedResources(ctx, log, namespace)
}
// Restore the Extension resource.
func (a *actuator) Restore(ctx context.Context, log logr.Logger, ex *extensionsv1alpha1.Extension) error {
return a.Reconcile(ctx, log, ex)
}
// Migrate the Extension resource.
func (a *actuator) Migrate(ctx context.Context, log logr.Logger, ex *extensionsv1alpha1.Extension) error {
return a.Delete(ctx, log, ex)
}
func (a *actuator) reconcileVPNEnvoyFilter(
ctx context.Context,
alwaysAllowedCIDRs []string,
) error {
aclMappings, err := a.getAllShootsWithACLExtension(ctx)
if err != nil {
return err
}
vpnEnvoyFilterSpec, err := a.envoyfilterService.BuildVPNEnvoyFilterSpecForHelmChart(
aclMappings, alwaysAllowedCIDRs,
)
if err != nil {
return err
}
// build EnvoyFilter object as map[string]interface{}
// because the actual EnvoyFilter struct is a pain to type
name := "acl-vpn"
// build EnvoyFilter object as map[string]interface{}
// because the actual EnvoyFilter struct is a pain to type
envoyFilter := &unstructured.Unstructured{}
envoyFilter.SetGroupVersionKind(istionetworkingClientGo.SchemeGroupVersion.WithKind("EnvoyFilter"))
envoyFilter.SetNamespace(IngressNamespace)
envoyFilter.SetName(name)
err = a.client.Get(ctx, client.ObjectKeyFromObject(envoyFilter), envoyFilter)
if client.IgnoreNotFound(err) != nil {
return err
}
envoyFilter.Object["spec"] = vpnEnvoyFilterSpec
if apierrors.IsNotFound(err) {
return a.client.Create(ctx, envoyFilter)
}
return a.client.Update(ctx, envoyFilter)
}
func (a *actuator) createSeedResources(
ctx context.Context,
log logr.Logger,
namespace string,
spec *ExtensionSpec,
cluster *controller.Cluster,
hosts []string,
shootSpecificCIRDs []string,
alwaysAllowedCIDRs []string,
) error {
var err error
apiEnvoyFilterSpec, err := a.envoyfilterService.BuildAPIEnvoyFilterSpecForHelmChart(
spec.Rule, hosts, append(alwaysAllowedCIDRs, shootSpecificCIRDs...),
)
if err != nil {
return err
}
cfg := map[string]interface{}{
"shootName": cluster.Shoot.Status.TechnicalID,
"targetNamespace": IngressNamespace,
"apiEnvoyFilterSpec": apiEnvoyFilterSpec,
}
cfg, err = chart.InjectImages(cfg, imagevector.ImageVector(), []string{ImageName})
if err != nil {
return fmt.Errorf("failed to find image version for %s: %v", ImageName, err)
}
renderer, err := chartrenderer.NewForConfig(a.config)
if err != nil {
return errors.Wrap(err, "could not create chart renderer")
}
log.Info("Component is being applied", "component", "component-name", "namespace", namespace)
return a.createManagedResource(ctx, namespace, ResourceNameSeed, "seed", renderer, ChartNameSeed, namespace, cfg, nil, charts.Seed)
}
func (a *actuator) deleteSeedResources(ctx context.Context, log logr.Logger, namespace string) error {
log.Info("Deleting managed resource for seed", "namespace", namespace)
if err := managedresources.Delete(ctx, a.client, namespace, ResourceNameSeed, false); err != nil {
return err
}
timeoutCtx, cancel := context.WithTimeout(ctx, deletionTimeout)
defer cancel()
return managedresources.WaitUntilDeleted(timeoutCtx, a.client, namespace, ResourceNameSeed)
}
func (a *actuator) createManagedResource(
ctx context.Context,
namespace, name, class string,
renderer chartrenderer.Interface,
chartName, chartNamespace string,
chartValues map[string]interface{},
injectedLabels map[string]string,
embeddedChart embed.FS,
) error {
renderedChart, err := renderer.RenderEmbeddedFS(embeddedChart, chartName, chartName, chartNamespace, chartValues)
if err != nil {
return err
}
data := map[string][]byte{chartName: renderedChart.Manifest()}
keepObjects := false
forceOverwriteAnnotations := false
return managedresources.Create(
ctx,
a.client,
namespace,
name,
map[string]string{}, // labels
false, // secretNameWithPrefix
class,
data,
&keepObjects,
injectedLabels,
&forceOverwriteAnnotations,
)
}
func (a *actuator) updateStatus(ctx context.Context, ex *extensionsv1alpha1.Extension, _ *ExtensionSpec) error {
var resources []gardencorev1beta1.NamedResourceReference
patch := client.MergeFrom(ex.DeepCopy())
ex.Status.Resources = resources
return a.client.Status().Patch(ctx, ex, patch)
}
func (a *actuator) updateEnvoyFilterHash(ctx context.Context, shootName string, extSpec *ExtensionSpec, inDeletion bool) error {
// get envoyfilter with the shoot's name
envoyFilter := &istionetworkingClientGo.EnvoyFilter{}
namespacedName := types.NamespacedName{
Namespace: IngressNamespace,
Name: shootName,
}
if err := a.client.Get(ctx, namespacedName, envoyFilter); err != nil {
return client.IgnoreNotFound(err)
}
if inDeletion {
delete(envoyFilter.Annotations, HashAnnotationName)
return a.client.Update(ctx, envoyFilter)
}
// calculate the new hash
newHashString, err := HashData(extSpec.Rule)
if err != nil {
return err
}
// get the annotation hash
if envoyFilter.Annotations == nil {
envoyFilter.Annotations = map[string]string{}
}
oldHashString, ok := envoyFilter.Annotations[HashAnnotationName]
// set hash if not present or different
if !ok || oldHashString != newHashString {
envoyFilter.Annotations[HashAnnotationName] = newHashString
return a.client.Update(ctx, envoyFilter)
}
// hash unchanged, do nothing
return nil
}
// getAllShootsWithACLExtension returns a list of all shoots that have the ACL
// extension enabled, together with their rule.
func (a *actuator) getAllShootsWithACLExtension(ctx context.Context) ([]envoyfilters.ACLMapping, error) {
extensions := &extensionsv1alpha1.ExtensionList{}
err := a.client.List(ctx, extensions)
if err != client.IgnoreNotFound(err) {
return nil, err
}
if len(extensions.Items) < 1 {
return nil, ErrNoExtensionsFound
}
mappings := []envoyfilters.ACLMapping{}
for i := range extensions.Items {
ex := &extensions.Items[i]
if ex.Spec.Type != Type {
continue
}
extSpec := &ExtensionSpec{}
if ex.Spec.ProviderConfig != nil && ex.Spec.ProviderConfig.Raw != nil {
if err := json.Unmarshal(ex.Spec.ProviderConfig.Raw, &extSpec); err != nil {
return nil, err
}
}
cluster, err := controller.GetCluster(ctx, a.client, ex.GetNamespace())
if err != nil {
return nil, err
}
infra := &extensionsv1alpha1.Infrastructure{}
namespacedName := types.NamespacedName{
Namespace: ex.GetNamespace(),
Name: cluster.Shoot.Name,
}
if err := a.client.Get(ctx, namespacedName, infra); err != nil {
return nil, err
}
var shootSpecificCIDRs []string
shootSpecificCIDRs = append(shootSpecificCIDRs, helper.GetShootNodeSpecificAllowedCIDRs(cluster.Shoot)...)
providerSpecificCIRDs, err := helper.GetProviderSpecificAllowedCIDRs(infra)
if err != nil {
return nil, err
}
shootSpecificCIDRs = append(shootSpecificCIDRs, providerSpecificCIRDs...)
mappings = append(mappings, envoyfilters.ACLMapping{
ShootName: ex.Namespace,
Rule: *extSpec.Rule,
ShootSpecificCIDRs: shootSpecificCIDRs,
})
}
return mappings, nil
}
// HashData returns a 16 char hash for the given object.
func HashData(data interface{}) (string, error) {
var jsonSpec []byte
var err error
if jsonSpec, err = json.Marshal(data); err != nil {
return "", err
}
bytes := sha256.Sum256(jsonSpec)
return strings.ToLower(base32.StdEncoding.EncodeToString(bytes[:]))[:16], nil
}