/
privileged_namespaces_controller.go
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/
privileged_namespaces_controller.go
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package psalabelsyncer
import (
"context"
"fmt"
"time"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
corev1apply "k8s.io/client-go/applyconfigurations/core/v1"
corev1informers "k8s.io/client-go/informers/core/v1"
corev1client "k8s.io/client-go/kubernetes/typed/core/v1"
corev1listers "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
"k8s.io/klog/v2"
"k8s.io/kubernetes/pkg/controller"
psapi "k8s.io/pod-security-admission/api"
"github.com/openshift/library-go/pkg/controller/factory"
"github.com/openshift/library-go/pkg/operator/events"
)
const privilegedControllerName = "privileged-namespaces-psa-label-syncer"
type privilegedNamespacesPSALabelSyncer struct {
nsClient corev1client.NamespaceInterface
nsLister corev1listers.NamespaceLister
nsCacheSynced cache.InformerSynced
workqueue workqueue.RateLimitingInterface
}
func NewPrivilegedNamespacesPSALabelSyncer(
ctx context.Context,
namespaceClient corev1client.NamespaceInterface,
namespaceInformer corev1informers.NamespaceInformer,
eventRecorder events.Recorder,
) *privilegedNamespacesPSALabelSyncer {
c := &privilegedNamespacesPSALabelSyncer{
nsClient: namespaceClient,
nsLister: namespaceInformer.Lister(),
nsCacheSynced: namespaceInformer.Informer().HasSynced,
workqueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), privilegedControllerName),
}
logger := klog.FromContext(ctx)
namespaceInformer.Informer().AddEventHandler(
cache.FilteringResourceEventHandler{
FilterFunc: factory.NamesFilter("default", "kube-system", "kube-public"),
Handler: cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
c.enqueueNS(logger, obj)
},
UpdateFunc: func(_, newObj interface{}) {
c.enqueueNS(logger, newObj)
},
DeleteFunc: nil,
},
},
)
return c
}
func (c *privilegedNamespacesPSALabelSyncer) Run(ctx context.Context, _ int) {
defer utilruntime.HandleCrash()
defer c.workqueue.ShutDown()
logger := klog.FromContext(ctx)
logger.Info("Starting", "controller", privilegedControllerName)
defer logger.Info("Shutting down", "controller", privilegedControllerName)
if !cache.WaitForNamedCacheSync(privilegedControllerName, ctx.Done(), c.nsCacheSynced) {
return
}
go wait.UntilWithContext(ctx, c.worker, time.Second)
<-ctx.Done()
}
func (c *privilegedNamespacesPSALabelSyncer) worker(ctx context.Context) {
workerFunc := func(ctx context.Context) bool {
key, quit := c.workqueue.Get()
if quit {
return true
}
defer c.workqueue.Done(key)
logger := klog.FromContext(ctx)
logger = klog.LoggerWithValues(logger, "queueKey", key)
ctx = klog.NewContext(ctx, logger)
err := c.sync(ctx, key.(string))
if err == nil {
c.workqueue.Forget(key)
return false
}
utilruntime.HandleError(err)
c.workqueue.AddRateLimited(key)
return false
}
for {
if quit := workerFunc(ctx); quit {
return
}
}
}
func (c *privilegedNamespacesPSALabelSyncer) sync(ctx context.Context, nsName string) error {
ns, err := c.nsLister.Get(nsName)
if err != nil {
return fmt.Errorf("failed to retrieve ns %q: %w", nsName, err)
}
if ns.Labels[psapi.EnforceLevelLabel] == "privileged" &&
ns.Labels[psapi.WarnLevelLabel] == "privileged" &&
ns.Labels[psapi.AuditLevelLabel] == "privileged" {
return nil
}
nsApplyConfig := corev1apply.Namespace(ns.Name).WithLabels(map[string]string{
psapi.EnforceLevelLabel: "privileged",
psapi.WarnLevelLabel: "privileged",
psapi.AuditLevelLabel: "privileged",
})
_, err = c.nsClient.Apply(ctx, nsApplyConfig, v1.ApplyOptions{FieldManager: privilegedControllerName, Force: true})
return err
}
func (c *privilegedNamespacesPSALabelSyncer) enqueueNS(logger klog.Logger, obj interface{}) {
key, err := controller.KeyFunc(obj)
if err != nil {
logger.Error(err, "Couldn't get key", "object", obj)
return
}
c.workqueue.Add(key)
}