99151c39b7
Most of the individual controllers were already converted earlier. Some log calls were missed or added and then not updated during a rebase. Some of those get updated here to fill those gaps. Adding of the name to the logger used by each controller gets consolidated in this commit. By using the name under which the controller is registered we ensure that the names in the log are consistent.
624 lines
20 KiB
Go
624 lines
20 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package serviceaccount
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import (
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"bytes"
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"context"
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"fmt"
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"time"
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v1 "k8s.io/api/core/v1"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/types"
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utilerrors "k8s.io/apimachinery/pkg/util/errors"
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/apimachinery/pkg/util/wait"
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apiserverserviceaccount "k8s.io/apiserver/pkg/authentication/serviceaccount"
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informers "k8s.io/client-go/informers/core/v1"
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clientset "k8s.io/client-go/kubernetes"
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listersv1 "k8s.io/client-go/listers/core/v1"
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"k8s.io/client-go/tools/cache"
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clientretry "k8s.io/client-go/util/retry"
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"k8s.io/client-go/util/workqueue"
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"k8s.io/klog/v2"
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"k8s.io/kubernetes/pkg/serviceaccount"
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)
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// RemoveTokenBackoff is the recommended (empirical) retry interval for removing
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// a secret reference from a service account when the secret is deleted. It is
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// exported for use by custom secret controllers.
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var RemoveTokenBackoff = wait.Backoff{
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Steps: 10,
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Duration: 100 * time.Millisecond,
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Jitter: 1.0,
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}
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// TokensControllerOptions contains options for the TokensController
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type TokensControllerOptions struct {
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// TokenGenerator is the generator to use to create new tokens
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TokenGenerator serviceaccount.TokenGenerator
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// ServiceAccountResync is the time.Duration at which to fully re-list service accounts.
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// If zero, re-list will be delayed as long as possible
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ServiceAccountResync time.Duration
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// SecretResync is the time.Duration at which to fully re-list secrets.
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// If zero, re-list will be delayed as long as possible
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SecretResync time.Duration
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// This CA will be added in the secrets of service accounts
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RootCA []byte
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// MaxRetries controls the maximum number of times a particular key is retried before giving up
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// If zero, a default max is used
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MaxRetries int
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}
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// NewTokensController returns a new *TokensController.
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func NewTokensController(serviceAccounts informers.ServiceAccountInformer, secrets informers.SecretInformer, cl clientset.Interface, options TokensControllerOptions) (*TokensController, error) {
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maxRetries := options.MaxRetries
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if maxRetries == 0 {
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maxRetries = 10
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}
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e := &TokensController{
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client: cl,
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token: options.TokenGenerator,
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rootCA: options.RootCA,
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syncServiceAccountQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "serviceaccount_tokens_service"),
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syncSecretQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "serviceaccount_tokens_secret"),
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maxRetries: maxRetries,
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}
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e.serviceAccounts = serviceAccounts.Lister()
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e.serviceAccountSynced = serviceAccounts.Informer().HasSynced
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serviceAccounts.Informer().AddEventHandlerWithResyncPeriod(
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cache.ResourceEventHandlerFuncs{
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AddFunc: e.queueServiceAccountSync,
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UpdateFunc: e.queueServiceAccountUpdateSync,
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DeleteFunc: e.queueServiceAccountSync,
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},
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options.ServiceAccountResync,
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)
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secretCache := secrets.Informer().GetIndexer()
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e.updatedSecrets = cache.NewIntegerResourceVersionMutationCache(secretCache, secretCache, 60*time.Second, true)
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e.secretSynced = secrets.Informer().HasSynced
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secrets.Informer().AddEventHandlerWithResyncPeriod(
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cache.FilteringResourceEventHandler{
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FilterFunc: func(obj interface{}) bool {
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switch t := obj.(type) {
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case *v1.Secret:
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return t.Type == v1.SecretTypeServiceAccountToken
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default:
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utilruntime.HandleError(fmt.Errorf("object passed to %T that is not expected: %T", e, obj))
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return false
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}
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},
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Handler: cache.ResourceEventHandlerFuncs{
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AddFunc: e.queueSecretSync,
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UpdateFunc: e.queueSecretUpdateSync,
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DeleteFunc: e.queueSecretSync,
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},
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},
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options.SecretResync,
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)
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return e, nil
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}
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// TokensController manages ServiceAccountToken secrets for ServiceAccount objects
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type TokensController struct {
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client clientset.Interface
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token serviceaccount.TokenGenerator
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rootCA []byte
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serviceAccounts listersv1.ServiceAccountLister
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// updatedSecrets is a wrapper around the shared cache which allows us to record
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// and return our local mutations (since we're very likely to act on an updated
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// secret before the watch reports it).
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updatedSecrets cache.MutationCache
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// Since we join two objects, we'll watch both of them with controllers.
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serviceAccountSynced cache.InformerSynced
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secretSynced cache.InformerSynced
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// syncServiceAccountQueue handles service account events:
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// * ensures tokens are removed for service accounts which no longer exist
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// key is "<namespace>/<name>/<uid>"
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syncServiceAccountQueue workqueue.RateLimitingInterface
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// syncSecretQueue handles secret events:
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// * deletes tokens whose service account no longer exists
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// * updates tokens with missing token or namespace data, or mismatched ca data
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// * ensures service account secret references are removed for tokens which are deleted
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// key is a secretQueueKey{}
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syncSecretQueue workqueue.RateLimitingInterface
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maxRetries int
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}
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// Run runs controller blocks until stopCh is closed
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func (e *TokensController) Run(ctx context.Context, workers int) {
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// Shut down queues
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defer utilruntime.HandleCrash()
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defer e.syncServiceAccountQueue.ShutDown()
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defer e.syncSecretQueue.ShutDown()
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if !cache.WaitForNamedCacheSync("tokens", ctx.Done(), e.serviceAccountSynced, e.secretSynced) {
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return
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}
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logger := klog.FromContext(ctx)
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logger.V(5).Info("Starting workers")
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for i := 0; i < workers; i++ {
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go wait.UntilWithContext(ctx, e.syncServiceAccount, 0)
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go wait.UntilWithContext(ctx, e.syncSecret, 0)
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}
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<-ctx.Done()
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logger.V(1).Info("Shutting down")
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}
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func (e *TokensController) queueServiceAccountSync(obj interface{}) {
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if serviceAccount, ok := obj.(*v1.ServiceAccount); ok {
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e.syncServiceAccountQueue.Add(makeServiceAccountKey(serviceAccount))
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}
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}
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func (e *TokensController) queueServiceAccountUpdateSync(oldObj interface{}, newObj interface{}) {
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if serviceAccount, ok := newObj.(*v1.ServiceAccount); ok {
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e.syncServiceAccountQueue.Add(makeServiceAccountKey(serviceAccount))
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}
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}
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// complete optionally requeues key, then calls queue.Done(key)
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func (e *TokensController) retryOrForget(logger klog.Logger, queue workqueue.RateLimitingInterface, key interface{}, requeue bool) {
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if !requeue {
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queue.Forget(key)
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return
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}
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requeueCount := queue.NumRequeues(key)
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if requeueCount < e.maxRetries {
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queue.AddRateLimited(key)
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return
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}
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logger.V(4).Info("retried several times", "key", key, "count", requeueCount)
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queue.Forget(key)
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}
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func (e *TokensController) queueSecretSync(obj interface{}) {
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if secret, ok := obj.(*v1.Secret); ok {
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e.syncSecretQueue.Add(makeSecretQueueKey(secret))
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}
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}
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func (e *TokensController) queueSecretUpdateSync(oldObj interface{}, newObj interface{}) {
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if secret, ok := newObj.(*v1.Secret); ok {
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e.syncSecretQueue.Add(makeSecretQueueKey(secret))
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}
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}
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func (e *TokensController) syncServiceAccount(ctx context.Context) {
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logger := klog.FromContext(ctx)
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key, quit := e.syncServiceAccountQueue.Get()
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if quit {
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return
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}
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defer e.syncServiceAccountQueue.Done(key)
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retry := false
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defer func() {
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e.retryOrForget(logger, e.syncServiceAccountQueue, key, retry)
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}()
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saInfo, err := parseServiceAccountKey(key)
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if err != nil {
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logger.Error(err, "Parsing service account key")
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return
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}
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sa, err := e.getServiceAccount(saInfo.namespace, saInfo.name, saInfo.uid, false)
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switch {
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case err != nil:
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logger.Error(err, "Getting service account")
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retry = true
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case sa == nil:
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// service account no longer exists, so delete related tokens
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logger.V(4).Info("Service account deleted, removing tokens", "namespace", saInfo.namespace, "serviceaccount", saInfo.name)
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sa = &v1.ServiceAccount{ObjectMeta: metav1.ObjectMeta{Namespace: saInfo.namespace, Name: saInfo.name, UID: saInfo.uid}}
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retry, err = e.deleteTokens(sa)
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if err != nil {
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logger.Error(err, "Error deleting serviceaccount tokens", "namespace", saInfo.namespace, "serviceaccount", saInfo.name)
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}
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}
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}
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func (e *TokensController) syncSecret(ctx context.Context) {
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key, quit := e.syncSecretQueue.Get()
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if quit {
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return
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}
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defer e.syncSecretQueue.Done(key)
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logger := klog.FromContext(ctx)
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// Track whether or not we should retry this sync
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retry := false
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defer func() {
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e.retryOrForget(logger, e.syncSecretQueue, key, retry)
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}()
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secretInfo, err := parseSecretQueueKey(key)
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if err != nil {
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logger.Error(err, "Parsing secret queue key")
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return
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}
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secret, err := e.getSecret(secretInfo.namespace, secretInfo.name, secretInfo.uid, false)
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switch {
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case err != nil:
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logger.Error(err, "Getting secret")
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retry = true
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case secret == nil:
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// If the service account exists
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if sa, saErr := e.getServiceAccount(secretInfo.namespace, secretInfo.saName, secretInfo.saUID, false); saErr == nil && sa != nil {
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// secret no longer exists, so delete references to this secret from the service account
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if err := clientretry.RetryOnConflict(RemoveTokenBackoff, func() error {
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return e.removeSecretReference(secretInfo.namespace, secretInfo.saName, secretInfo.saUID, secretInfo.name)
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}); err != nil {
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logger.Error(err, "Removing secret reference")
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}
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}
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default:
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// Ensure service account exists
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sa, saErr := e.getServiceAccount(secretInfo.namespace, secretInfo.saName, secretInfo.saUID, true)
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switch {
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case saErr != nil:
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logger.Error(saErr, "Getting service account")
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retry = true
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case sa == nil:
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// Delete token
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logger.V(4).Info("Service account does not exist, deleting token", "secret", klog.KRef(secretInfo.namespace, secretInfo.name))
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if retriable, err := e.deleteToken(secretInfo.namespace, secretInfo.name, secretInfo.uid); err != nil {
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logger.Error(err, "Deleting serviceaccount token", "secret", klog.KRef(secretInfo.namespace, secretInfo.name), "serviceAccount", klog.KRef(secretInfo.namespace, secretInfo.saName))
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retry = retriable
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}
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default:
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// Update token if needed
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if retriable, err := e.generateTokenIfNeeded(logger, sa, secret); err != nil {
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logger.Error(err, "Populating serviceaccount token", "secret", klog.KRef(secretInfo.namespace, secretInfo.name), "serviceAccount", klog.KRef(secretInfo.namespace, secretInfo.saName))
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retry = retriable
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}
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}
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}
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}
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func (e *TokensController) deleteTokens(serviceAccount *v1.ServiceAccount) ( /*retry*/ bool, error) {
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tokens, err := e.listTokenSecrets(serviceAccount)
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if err != nil {
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// don't retry on cache lookup errors
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return false, err
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}
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retry := false
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errs := []error{}
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for _, token := range tokens {
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r, err := e.deleteToken(token.Namespace, token.Name, token.UID)
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if err != nil {
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errs = append(errs, err)
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}
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if r {
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retry = true
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}
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}
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return retry, utilerrors.NewAggregate(errs)
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}
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func (e *TokensController) deleteToken(ns, name string, uid types.UID) ( /*retry*/ bool, error) {
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var opts metav1.DeleteOptions
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if len(uid) > 0 {
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opts.Preconditions = &metav1.Preconditions{UID: &uid}
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}
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err := e.client.CoreV1().Secrets(ns).Delete(context.TODO(), name, opts)
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// NotFound doesn't need a retry (it's already been deleted)
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// Conflict doesn't need a retry (the UID precondition failed)
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if err == nil || apierrors.IsNotFound(err) || apierrors.IsConflict(err) {
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return false, nil
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}
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// Retry for any other error
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return true, err
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}
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func (e *TokensController) secretUpdateNeeded(secret *v1.Secret) (bool, bool, bool) {
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caData := secret.Data[v1.ServiceAccountRootCAKey]
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needsCA := len(e.rootCA) > 0 && !bytes.Equal(caData, e.rootCA)
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needsNamespace := len(secret.Data[v1.ServiceAccountNamespaceKey]) == 0
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tokenData := secret.Data[v1.ServiceAccountTokenKey]
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needsToken := len(tokenData) == 0
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return needsCA, needsNamespace, needsToken
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}
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// generateTokenIfNeeded populates the token data for the given Secret if not already set
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func (e *TokensController) generateTokenIfNeeded(logger klog.Logger, serviceAccount *v1.ServiceAccount, cachedSecret *v1.Secret) ( /* retry */ bool, error) {
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// Check the cached secret to see if changes are needed
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if needsCA, needsNamespace, needsToken := e.secretUpdateNeeded(cachedSecret); !needsCA && !needsToken && !needsNamespace {
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return false, nil
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}
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// We don't want to update the cache's copy of the secret
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// so add the token to a freshly retrieved copy of the secret
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secrets := e.client.CoreV1().Secrets(cachedSecret.Namespace)
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liveSecret, err := secrets.Get(context.TODO(), cachedSecret.Name, metav1.GetOptions{})
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if err != nil {
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// Retry for any error other than a NotFound
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return !apierrors.IsNotFound(err), err
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}
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if liveSecret.ResourceVersion != cachedSecret.ResourceVersion {
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// our view of the secret is not up to date
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// we'll get notified of an update event later and get to try again
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logger.V(2).Info("Secret is not up to date, skipping token population", "secret", klog.KRef(liveSecret.Namespace, liveSecret.Name))
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return false, nil
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}
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needsCA, needsNamespace, needsToken := e.secretUpdateNeeded(liveSecret)
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if !needsCA && !needsToken && !needsNamespace {
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return false, nil
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}
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if liveSecret.Annotations == nil {
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liveSecret.Annotations = map[string]string{}
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}
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if liveSecret.Data == nil {
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liveSecret.Data = map[string][]byte{}
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}
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// Set the CA
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if needsCA {
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liveSecret.Data[v1.ServiceAccountRootCAKey] = e.rootCA
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}
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// Set the namespace
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if needsNamespace {
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liveSecret.Data[v1.ServiceAccountNamespaceKey] = []byte(liveSecret.Namespace)
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}
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// Generate the token
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if needsToken {
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token, err := e.token.GenerateToken(serviceaccount.LegacyClaims(*serviceAccount, *liveSecret))
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if err != nil {
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return false, err
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}
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liveSecret.Data[v1.ServiceAccountTokenKey] = []byte(token)
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}
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// Set annotations
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liveSecret.Annotations[v1.ServiceAccountNameKey] = serviceAccount.Name
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liveSecret.Annotations[v1.ServiceAccountUIDKey] = string(serviceAccount.UID)
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// Save the secret
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_, err = secrets.Update(context.TODO(), liveSecret, metav1.UpdateOptions{})
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if apierrors.IsConflict(err) || apierrors.IsNotFound(err) {
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// if we got a Conflict error, the secret was updated by someone else, and we'll get an update notification later
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// if we got a NotFound error, the secret no longer exists, and we don't need to populate a token
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return false, nil
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}
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if err != nil {
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return true, err
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}
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return false, nil
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}
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// removeSecretReference updates the given ServiceAccount to remove a reference to the given secretName if needed.
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func (e *TokensController) removeSecretReference(saNamespace string, saName string, saUID types.UID, secretName string) error {
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// We don't want to update the cache's copy of the service account
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// so remove the secret from a freshly retrieved copy of the service account
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serviceAccounts := e.client.CoreV1().ServiceAccounts(saNamespace)
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serviceAccount, err := serviceAccounts.Get(context.TODO(), saName, metav1.GetOptions{})
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// Ignore NotFound errors when attempting to remove a reference
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if apierrors.IsNotFound(err) {
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return nil
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}
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if err != nil {
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return err
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}
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// Short-circuit if the UID doesn't match
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if len(saUID) > 0 && saUID != serviceAccount.UID {
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return nil
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}
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// Short-circuit if the secret is no longer referenced
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if !getSecretReferences(serviceAccount).Has(secretName) {
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return nil
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}
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// Remove the secret
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secrets := []v1.ObjectReference{}
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for _, s := range serviceAccount.Secrets {
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if s.Name != secretName {
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secrets = append(secrets, s)
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}
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}
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serviceAccount.Secrets = secrets
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_, err = serviceAccounts.Update(context.TODO(), serviceAccount, metav1.UpdateOptions{})
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// Ignore NotFound errors when attempting to remove a reference
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if apierrors.IsNotFound(err) {
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return nil
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}
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return err
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}
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func (e *TokensController) getServiceAccount(ns string, name string, uid types.UID, fetchOnCacheMiss bool) (*v1.ServiceAccount, error) {
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// Look up in cache
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sa, err := e.serviceAccounts.ServiceAccounts(ns).Get(name)
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if err != nil && !apierrors.IsNotFound(err) {
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return nil, err
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}
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if sa != nil {
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// Ensure UID matches if given
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if len(uid) == 0 || uid == sa.UID {
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return sa, nil
|
|
}
|
|
}
|
|
|
|
if !fetchOnCacheMiss {
|
|
return nil, nil
|
|
}
|
|
|
|
// Live lookup
|
|
sa, err = e.client.CoreV1().ServiceAccounts(ns).Get(context.TODO(), name, metav1.GetOptions{})
|
|
if apierrors.IsNotFound(err) {
|
|
return nil, nil
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// Ensure UID matches if given
|
|
if len(uid) == 0 || uid == sa.UID {
|
|
return sa, nil
|
|
}
|
|
return nil, nil
|
|
}
|
|
|
|
func (e *TokensController) getSecret(ns string, name string, uid types.UID, fetchOnCacheMiss bool) (*v1.Secret, error) {
|
|
// Look up in cache
|
|
obj, exists, err := e.updatedSecrets.GetByKey(makeCacheKey(ns, name))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if exists {
|
|
secret, ok := obj.(*v1.Secret)
|
|
if !ok {
|
|
return nil, fmt.Errorf("expected *v1.Secret, got %#v", secret)
|
|
}
|
|
// Ensure UID matches if given
|
|
if len(uid) == 0 || uid == secret.UID {
|
|
return secret, nil
|
|
}
|
|
}
|
|
|
|
if !fetchOnCacheMiss {
|
|
return nil, nil
|
|
}
|
|
|
|
// Live lookup
|
|
secret, err := e.client.CoreV1().Secrets(ns).Get(context.TODO(), name, metav1.GetOptions{})
|
|
if apierrors.IsNotFound(err) {
|
|
return nil, nil
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// Ensure UID matches if given
|
|
if len(uid) == 0 || uid == secret.UID {
|
|
return secret, nil
|
|
}
|
|
return nil, nil
|
|
}
|
|
|
|
// listTokenSecrets returns a list of all of the ServiceAccountToken secrets that
|
|
// reference the given service account's name and uid
|
|
func (e *TokensController) listTokenSecrets(serviceAccount *v1.ServiceAccount) ([]*v1.Secret, error) {
|
|
namespaceSecrets, err := e.updatedSecrets.ByIndex("namespace", serviceAccount.Namespace)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
items := []*v1.Secret{}
|
|
for _, obj := range namespaceSecrets {
|
|
secret := obj.(*v1.Secret)
|
|
|
|
if apiserverserviceaccount.IsServiceAccountToken(secret, serviceAccount) {
|
|
items = append(items, secret)
|
|
}
|
|
}
|
|
return items, nil
|
|
}
|
|
|
|
func getSecretReferences(serviceAccount *v1.ServiceAccount) sets.String {
|
|
references := sets.NewString()
|
|
for _, secret := range serviceAccount.Secrets {
|
|
references.Insert(secret.Name)
|
|
}
|
|
return references
|
|
}
|
|
|
|
// serviceAccountQueueKey holds information we need to sync a service account.
|
|
// It contains enough information to look up the cached service account,
|
|
// or delete owned tokens if the service account no longer exists.
|
|
type serviceAccountQueueKey struct {
|
|
namespace string
|
|
name string
|
|
uid types.UID
|
|
}
|
|
|
|
func makeServiceAccountKey(sa *v1.ServiceAccount) interface{} {
|
|
return serviceAccountQueueKey{
|
|
namespace: sa.Namespace,
|
|
name: sa.Name,
|
|
uid: sa.UID,
|
|
}
|
|
}
|
|
|
|
func parseServiceAccountKey(key interface{}) (serviceAccountQueueKey, error) {
|
|
queueKey, ok := key.(serviceAccountQueueKey)
|
|
if !ok || len(queueKey.namespace) == 0 || len(queueKey.name) == 0 || len(queueKey.uid) == 0 {
|
|
return serviceAccountQueueKey{}, fmt.Errorf("invalid serviceaccount key: %#v", key)
|
|
}
|
|
return queueKey, nil
|
|
}
|
|
|
|
// secretQueueKey holds information we need to sync a service account token secret.
|
|
// It contains enough information to look up the cached service account,
|
|
// or delete the secret reference if the secret no longer exists.
|
|
type secretQueueKey struct {
|
|
namespace string
|
|
name string
|
|
uid types.UID
|
|
saName string
|
|
// optional, will be blank when syncing tokens missing the service account uid annotation
|
|
saUID types.UID
|
|
}
|
|
|
|
func makeSecretQueueKey(secret *v1.Secret) interface{} {
|
|
return secretQueueKey{
|
|
namespace: secret.Namespace,
|
|
name: secret.Name,
|
|
uid: secret.UID,
|
|
saName: secret.Annotations[v1.ServiceAccountNameKey],
|
|
saUID: types.UID(secret.Annotations[v1.ServiceAccountUIDKey]),
|
|
}
|
|
}
|
|
|
|
func parseSecretQueueKey(key interface{}) (secretQueueKey, error) {
|
|
queueKey, ok := key.(secretQueueKey)
|
|
if !ok || len(queueKey.namespace) == 0 || len(queueKey.name) == 0 || len(queueKey.uid) == 0 || len(queueKey.saName) == 0 {
|
|
return secretQueueKey{}, fmt.Errorf("invalid secret key: %#v", key)
|
|
}
|
|
return queueKey, nil
|
|
}
|
|
|
|
// produce the same key format as cache.MetaNamespaceKeyFunc
|
|
func makeCacheKey(namespace, name string) string {
|
|
return namespace + "/" + name
|
|
}
|