/
registration.go
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/
registration.go
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// This file may have been modified by vArmor Authors. ("vArmor Modifications").
// All vArmor Modifications are Copyright 2022 vArmor Authors.
//
// Copyright 2021 Kyverno Authors
//
// 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 webhookconfig
import (
"context"
"fmt"
"github.com/go-logr/logr"
admissionregistrationapi "k8s.io/api/admissionregistration/v1"
k8errors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
adminformers "k8s.io/client-go/informers/admissionregistration/v1"
admissionv1 "k8s.io/client-go/kubernetes/typed/admissionregistration/v1"
appsv1 "k8s.io/client-go/kubernetes/typed/apps/v1"
coordinationv1 "k8s.io/client-go/kubernetes/typed/coordination/v1"
corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
admlisters "k8s.io/client-go/listers/admissionregistration/v1"
"k8s.io/client-go/rest"
"github.com/bytedance/vArmor/internal/config"
varmortls "github.com/bytedance/vArmor/internal/tls"
varmorinterface "github.com/bytedance/vArmor/pkg/client/clientset/versioned/typed/varmor/v1beta1"
varmorinformer "github.com/bytedance/vArmor/pkg/client/informers/externalversions/varmor/v1beta1"
)
// Register manages webhook registration.
type Register struct {
clientConfig *rest.Config
mutateInterface admissionv1.MutatingWebhookConfigurationInterface
secretInterface corev1.SecretInterface
deploymentInterface appsv1.DeploymentInterface
leaseInterface coordinationv1.LeaseInterface
mwcLister admlisters.MutatingWebhookConfigurationLister
mwcListerSynced func() bool
managerIP string
timeoutSeconds int32
debug bool
stopCh <-chan struct{}
createDefaultWebhook chan string
log logr.Logger
}
// NewRegister creates new Register instance
func NewRegister(
clientConfig *rest.Config,
mutateInterface admissionv1.MutatingWebhookConfigurationInterface,
secretInterface corev1.SecretInterface,
deploymentInterface appsv1.DeploymentInterface,
leaseInterface coordinationv1.LeaseInterface,
varmorInterface varmorinterface.CrdV1beta1Interface,
vpInformer varmorinformer.VarmorPolicyInformer,
mwcInformer adminformers.MutatingWebhookConfigurationInformer,
managerIP string,
webhookTimeout int32,
debug bool,
stopCh <-chan struct{},
log logr.Logger) *Register {
register := &Register{
clientConfig: clientConfig,
mutateInterface: mutateInterface,
secretInterface: secretInterface,
deploymentInterface: deploymentInterface,
leaseInterface: leaseInterface,
managerIP: managerIP,
timeoutSeconds: webhookTimeout,
debug: debug,
createDefaultWebhook: make(chan string),
mwcLister: mwcInformer.Lister(),
mwcListerSynced: mwcInformer.Informer().HasSynced,
stopCh: stopCh,
log: log.WithName("Register"),
}
return register
}
func (wrc *Register) removeWebhookConfigurations() {
logger := wrc.log
configName := getResourceMutatingWebhookConfigName(wrc.debug)
err := wrc.mutateInterface.Delete(context.Background(), configName, metav1.DeleteOptions{})
if err != nil {
if !k8errors.IsNotFound(err) {
logger.Error(err, "failed to delete MutatingWebhookConfiguration", "name", configName)
}
return
}
logger.Info("MutatingWebhookConfiguration deleted")
}
func (wrc *Register) workloadResourceWebhookRule() admissionregistrationapi.Rule {
return admissionregistrationapi.Rule{
Resources: []string{"daemonsets", "deployments", "statefulsets"},
APIGroups: []string{"apps"},
APIVersions: []string{"v1"},
}
}
func (wrc *Register) podResourceWebhookRule() admissionregistrationapi.Rule {
return admissionregistrationapi.Rule{
Resources: []string{"pods"},
APIGroups: []string{""},
APIVersions: []string{"v1"},
}
}
func (wrc *Register) generateDefaultDebugMutatingWebhookConfig(caData []byte) *admissionregistrationapi.MutatingWebhookConfiguration {
logger := wrc.log
url := fmt.Sprintf("https://%s:%d%s", wrc.managerIP, config.WebhookServicePort, config.MutatingWebhookServicePath)
logger.Info("Debug MutatingWebhookConfiguration generated", "url", url)
return &admissionregistrationapi.MutatingWebhookConfiguration{
ObjectMeta: metav1.ObjectMeta{
Name: config.MutatingWebhookConfigurationDebugName,
},
Webhooks: []admissionregistrationapi.MutatingWebhook{
generateDebugMutatingWebhook(
config.MutatingWorkloadWebhookName,
url,
caData,
wrc.timeoutSeconds,
wrc.workloadResourceWebhookRule(),
[]admissionregistrationapi.OperationType{admissionregistrationapi.Create, admissionregistrationapi.Update},
admissionregistrationapi.Ignore,
),
generateDebugMutatingWebhook(
config.MutatingPodWebhookName,
url,
caData,
wrc.timeoutSeconds,
wrc.podResourceWebhookRule(),
[]admissionregistrationapi.OperationType{admissionregistrationapi.Create},
admissionregistrationapi.Ignore,
),
},
}
}
func (wrc *Register) generateDefaultMutatingWebhookConfig(caData []byte) *admissionregistrationapi.MutatingWebhookConfiguration {
return &admissionregistrationapi.MutatingWebhookConfiguration{
ObjectMeta: metav1.ObjectMeta{
Name: config.MutatingWebhookConfigurationName,
},
Webhooks: []admissionregistrationapi.MutatingWebhook{
generateMutatingWebhook(
config.MutatingWorkloadWebhookName,
config.MutatingWebhookServicePath,
caData,
wrc.timeoutSeconds,
wrc.workloadResourceWebhookRule(),
[]admissionregistrationapi.OperationType{admissionregistrationapi.Create, admissionregistrationapi.Update},
admissionregistrationapi.Ignore,
),
generateMutatingWebhook(
config.MutatingPodWebhookName,
config.MutatingWebhookServicePath,
caData,
wrc.timeoutSeconds,
wrc.podResourceWebhookRule(),
[]admissionregistrationapi.OperationType{admissionregistrationapi.Create},
admissionregistrationapi.Ignore,
),
},
}
}
func (wrc *Register) createResourceMutatingWebhookConfiguration(caData []byte) error {
logger := wrc.log
var cfg *admissionregistrationapi.MutatingWebhookConfiguration
if wrc.debug {
cfg = wrc.generateDefaultDebugMutatingWebhookConfig(caData)
} else {
cfg = wrc.generateDefaultMutatingWebhookConfig(caData)
}
_, err := wrc.mutateInterface.Create(context.Background(), cfg, metav1.CreateOptions{})
if err != nil {
if k8errors.IsAlreadyExists(err) {
logger.Info("MutatingWebhookConfiguration already exists", "name", cfg.Name)
return nil
}
logger.Error(err, "failed to create MutatingWebhookConfiguration", "name", cfg.Name)
return err
}
logger.Info("MutatingWebhookConfiguration created", "name", cfg.Name)
return nil
}
// Register clean up the old webhooks and re-creates admission webhooks configs on cluster
func (wrc *Register) Register() error {
wrc.removeWebhookConfigurations()
certProps, err := varmortls.GetTLSCertProps(wrc.clientConfig)
if err != nil {
return err
}
secretName := varmortls.GenerateRootCASecretName(certProps)
caData, err := varmortls.ReadRootCASecret(wrc.secretInterface, secretName)
if err != nil {
return fmt.Errorf("unable to extract CA data from %s secret", secretName)
}
err = wrc.createResourceMutatingWebhookConfiguration(caData)
if err != nil {
return err
}
return nil
}
// Check returns an error if the webhook is not configured
func (wrc *Register) Check() error {
_, err := wrc.mwcLister.Get(getResourceMutatingWebhookConfigName(wrc.debug))
return err
}
func (wrc *Register) ShouldRemoveVarmorResources() bool {
logger := wrc.log.WithName("shouldRemoveVarmorResources()")
if wrc.debug {
return true
}
deploy, err := wrc.deploymentInterface.Get(context.Background(), config.ManagerName, metav1.GetOptions{})
if err != nil {
if k8errors.IsNotFound(err) {
logger.Info("vArmor manager not found, cleanup webhook resources of vArmor")
return true
}
logger.Error(err, "failed to get vArmor manager, not cleaning up webhook resources of vArmor")
return false
}
if deploy.GetDeletionTimestamp() != nil {
logger.Info("vArmor manager is terminating, cleanup webhook resources")
return true
}
if *deploy.Spec.Replicas == 0 {
logger.Info("vArmor manager is scaled to zero, cleanup webhook resources")
return true
}
logger.Info("vArmor manager Pod is updating, won't clean up webhook resources")
return false
}
func (wrc *Register) removeSecrets() {
logger := wrc.log.WithValues("removeSecrets()")
certProps, err := varmortls.GetTLSCertProps(wrc.clientConfig)
if err != nil {
return
}
secretName := varmortls.GenerateRootCASecretName(certProps)
err = wrc.secretInterface.Delete(context.Background(), secretName, metav1.DeleteOptions{})
if err != nil {
if k8errors.IsNotFound(err) {
logger.Info("the secret of Root CA not found", "Secret", secretName)
}
logger.Error(err, "failed to delete the Root CA", "Secret", secretName)
}
secretName = varmortls.GenerateTLSPairSecretName(certProps)
err = wrc.secretInterface.Delete(context.Background(), secretName, metav1.DeleteOptions{})
if err != nil {
if k8errors.IsNotFound(err) {
logger.Info("the secret of TLS pair not found", "Secret", secretName)
}
logger.Error(err, "failed to delete the TLS pair", "Secret", secretName)
}
logger.Info("the secrets of webhook server deleted")
}
func (wrc *Register) removeLeases() {
wrc.leaseInterface.DeleteCollection(context.Background(), metav1.DeleteOptions{}, metav1.ListOptions{})
}
// Remove removes the webhook configuration, secrets and leases
func (wrc *Register) Remove() {
wrc.log.Info("cleaning up")
wrc.removeWebhookConfigurations()
wrc.removeSecrets()
wrc.removeLeases()
}