/
admission.go
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/
admission.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 clusteropenidconnectpreset
import (
"context"
"errors"
"fmt"
"io"
"strings"
"github.com/gardener/gardener/pkg/apis/core"
settingsv1alpha1 "github.com/gardener/gardener/pkg/apis/settings/v1alpha1"
admissioninitializer "github.com/gardener/gardener/pkg/apiserver/admission/initializer"
coreinformers "github.com/gardener/gardener/pkg/client/core/informers/internalversion"
corelisters "github.com/gardener/gardener/pkg/client/core/listers/core/internalversion"
settingsinformer "github.com/gardener/gardener/pkg/client/settings/informers/externalversions"
settingslister "github.com/gardener/gardener/pkg/client/settings/listers/settings/v1alpha1"
applier "github.com/gardener/gardener/plugin/pkg/shoot/oidc"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apiserver/pkg/admission"
)
const (
// PluginName is the name of this admission plugin.
PluginName = "ClusterOpenIDConnectPreset"
)
// Register registers a plugin.
func Register(plugins *admission.Plugins) {
plugins.Register(PluginName, func(config io.Reader) (admission.Interface, error) {
return New()
})
}
// ClusterOpenIDConnectPreset contains listers and and admission handler.
type ClusterOpenIDConnectPreset struct {
*admission.Handler
projectLister corelisters.ProjectLister
clusterOIDCLister settingslister.ClusterOpenIDConnectPresetLister
readyFunc admission.ReadyFunc
}
var (
_ = admissioninitializer.WantsInternalCoreInformerFactory(&ClusterOpenIDConnectPreset{})
_ = admissioninitializer.WantsSettingsInformerFactory(&ClusterOpenIDConnectPreset{})
readyFuncs = []admission.ReadyFunc{}
)
// New creates a new OpenIDConnectPreset admission plugin.
func New() (*ClusterOpenIDConnectPreset, error) {
return &ClusterOpenIDConnectPreset{
Handler: admission.NewHandler(admission.Create),
}, nil
}
// AssignReadyFunc assigns the ready function to the admission handler.
func (c *ClusterOpenIDConnectPreset) AssignReadyFunc(f admission.ReadyFunc) {
c.readyFunc = f
c.SetReadyFunc(f)
}
// SetInternalCoreInformerFactory gets Lister from SharedInformerFactory.
func (c *ClusterOpenIDConnectPreset) SetInternalCoreInformerFactory(f coreinformers.SharedInformerFactory) {
projectInformer := f.Core().InternalVersion().Projects()
c.projectLister = projectInformer.Lister()
readyFuncs = append(readyFuncs, projectInformer.Informer().HasSynced)
}
// SetSettingsInformerFactory gets Lister from SharedInformerFactory.
func (c *ClusterOpenIDConnectPreset) SetSettingsInformerFactory(f settingsinformer.SharedInformerFactory) {
oidc := f.Settings().V1alpha1().OpenIDConnectPresets()
clusterOIDC := f.Settings().V1alpha1().ClusterOpenIDConnectPresets()
c.clusterOIDCLister = clusterOIDC.Lister()
readyFuncs = append(readyFuncs, oidc.Informer().HasSynced, clusterOIDC.Informer().HasSynced)
}
// ValidateInitialization checks whether the plugin was correctly initialized.
func (c *ClusterOpenIDConnectPreset) ValidateInitialization() error {
if c.clusterOIDCLister == nil {
return errors.New("missing clusteropenidpreset lister")
}
if c.projectLister == nil {
return errors.New("missing project lister")
}
return nil
}
var _ admission.MutationInterface = &ClusterOpenIDConnectPreset{}
// Admit tries to determine a OpenIDConnectPreset hosted zone for the Shoot's external domain.
func (c *ClusterOpenIDConnectPreset) Admit(ctx context.Context, a admission.Attributes, o admission.ObjectInterfaces) error {
// Wait until the caches have been synced
if c.readyFunc == nil {
c.AssignReadyFunc(func() bool {
for _, readyFunc := range readyFuncs {
if !readyFunc() {
return false
}
}
return true
})
}
if !c.WaitForReady() {
return admission.NewForbidden(a, errors.New("not yet ready to handle request"))
}
// Ignore all kinds other than Shoot
// Ignore all subresource calls
// Ignore all operations other than CREATE
if len(a.GetSubresource()) != 0 || a.GetKind().GroupKind() != core.Kind("Shoot") || a.GetOperation() != admission.Create {
return nil
}
shoot, ok := a.GetObject().(*core.Shoot)
if !ok {
return apierrors.NewBadRequest("could not convert resource into Shoot object")
}
// If the Shoot manifest specifies OIDCConfig.
if shoot.Spec.Kubernetes.KubeAPIServer != nil && shoot.Spec.Kubernetes.KubeAPIServer.OIDCConfig != nil {
return nil
}
coidcs, err := c.clusterOIDCLister.List(labels.Everything())
if err != nil {
return apierrors.NewInternalError(fmt.Errorf("could not list existing clusteropenidconnectpresets: %w", err))
}
if len(coidcs) == 0 {
return nil
}
projects, err := c.projectLister.List(labels.Everything())
if err != nil {
return apierrors.NewInternalError(fmt.Errorf("could not list existing projects: %w", err))
}
if len(projects) == 0 {
return nil
}
var foundProject *core.Project
for _, project := range projects {
if project.Spec.Namespace != nil && *project.Spec.Namespace == shoot.Namespace && project.Status.Phase == core.ProjectReady {
foundProject = project
break
}
}
if foundProject == nil {
return nil
}
preset, err := filterClusterOIDCs(coidcs, shoot, foundProject)
if err != nil {
return apierrors.NewInternalError(err)
}
// We have an OpenIDConnectPreset, use it.
if preset != nil {
applier.ApplyOIDCConfiguration(shoot, preset)
return nil
}
return nil
}
func filterClusterOIDCs(oidcs []*settingsv1alpha1.ClusterOpenIDConnectPreset, shoot *core.Shoot, project *core.Project) (*settingsv1alpha1.OpenIDConnectPresetSpec, error) {
var matchedPreset *settingsv1alpha1.ClusterOpenIDConnectPreset
for _, oidc := range oidcs {
spec := oidc.Spec
projectSelector, err := metav1.LabelSelectorAsSelector(spec.ProjectSelector)
if err != nil {
return nil, fmt.Errorf("label selector conversion failed: %v for projectSelector: %w", *spec.ShootSelector, err)
}
shootSelector, err := metav1.LabelSelectorAsSelector(spec.ShootSelector)
if err != nil {
return nil, fmt.Errorf("label selector conversion failed: %v for shootSelector: %w", *spec.ShootSelector, err)
}
// check if the Shoot / project labels match the selector
if !projectSelector.Matches(labels.Set(project.Labels)) || !shootSelector.Matches(labels.Set(shoot.Labels)) {
continue
}
if matchedPreset == nil {
matchedPreset = oidc
} else if spec.Weight >= matchedPreset.Spec.Weight {
if spec.Weight > matchedPreset.Spec.Weight {
matchedPreset = oidc
} else if strings.Compare(oidc.ObjectMeta.Name, matchedPreset.ObjectMeta.Name) > 0 {
matchedPreset = oidc
}
}
}
if matchedPreset == nil {
return nil, nil
}
return &matchedPreset.Spec.OpenIDConnectPresetSpec, nil
}