/
controller.go
454 lines (391 loc) · 14.6 KB
/
controller.go
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package vulnerabilityreport
import (
. "github.com/kube-security-manager/kube-security-manager/pkg/operator/predicate"
"context"
"errors"
"fmt"
"reflect"
"github.com/go-logr/logr"
"github.com/kube-security-manager/kube-security-manager/pkg/apis/aquasecurity/v1alpha1"
"github.com/kube-security-manager/kube-security-manager/pkg/kube"
"github.com/kube-security-manager/kube-security-manager/pkg/operator/controller"
"github.com/kube-security-manager/kube-security-manager/pkg/operator/etc"
"github.com/kube-security-manager/kube-security-manager/pkg/starboard"
appsv1 "k8s.io/api/apps/v1"
batchv1 "k8s.io/api/batch/v1"
batchv1beta1 "k8s.io/api/batch/v1beta1"
corev1 "k8s.io/api/core/v1"
k8sapierror "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/builder"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
"sigs.k8s.io/controller-runtime/pkg/predicate"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
)
// WorkloadController watches Kubernetes workloads and generates
// v1alpha1.VulnerabilityReport instances using vulnerability scanner that that
// implements the Plugin interface.
type WorkloadController struct {
logr.Logger
etc.Config
client.Client
kube.ObjectResolver
controller.LimitChecker
kube.LogsReader
kube.SecretsReader
Plugin
starboard.PluginContext
ReadWriter
starboard.ConfigData
}
func (r *WorkloadController) SetupWithManager(mgr ctrl.Manager) error {
installModePredicate, err := InstallModePredicate(r.Config)
if err != nil {
return err
}
workloads := []struct {
kind kube.Kind
forObject client.Object
ownsObject client.Object
}{
{kind: kube.KindPod, forObject: &corev1.Pod{}, ownsObject: &v1alpha1.VulnerabilityReport{}},
{kind: kube.KindReplicaSet, forObject: &appsv1.ReplicaSet{}, ownsObject: &v1alpha1.VulnerabilityReport{}},
{kind: kube.KindReplicationController, forObject: &corev1.ReplicationController{}, ownsObject: &v1alpha1.VulnerabilityReport{}},
{kind: kube.KindStatefulSet, forObject: &appsv1.StatefulSet{}, ownsObject: &v1alpha1.VulnerabilityReport{}},
{kind: kube.KindDaemonSet, forObject: &appsv1.DaemonSet{}, ownsObject: &v1alpha1.VulnerabilityReport{}},
{kind: kube.KindCronJob, forObject: &batchv1beta1.CronJob{}, ownsObject: &v1alpha1.VulnerabilityReport{}},
{kind: kube.KindJob, forObject: &batchv1.Job{}, ownsObject: &v1alpha1.VulnerabilityReport{}},
}
for _, workload := range workloads {
err = ctrl.NewControllerManagedBy(mgr).
For(workload.forObject, builder.WithPredicates(
Not(ManagedByStarboardOperator),
Not(IsBeingTerminated),
installModePredicate,
)).
Owns(workload.ownsObject).
Complete(r.reconcileWorkload(workload.kind))
if err != nil {
return err
}
}
var predicates []predicate.Predicate
if !r.ConfigData.VulnerabilityScanJobsInSameNamespace() {
predicates = append(predicates, InNamespace(r.Config.Namespace))
}
predicates = append(predicates, ManagedByStarboardOperator, IsVulnerabilityReportScan, JobHasAnyCondition)
return ctrl.NewControllerManagedBy(mgr).
For(&batchv1.Job{}, builder.WithPredicates(predicates...)).
Complete(r.reconcileJobs())
}
func (r *WorkloadController) reconcileWorkload(workloadKind kube.Kind) reconcile.Func {
return func(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
log := r.Logger.WithValues("kind", workloadKind, "name", req.NamespacedName)
workloadRef := kube.ObjectRefFromKindAndObjectKey(workloadKind, req.NamespacedName)
log.V(1).Info("Getting workload from cache")
workloadObj, err := r.ObjectFromObjectRef(ctx, workloadRef)
if err != nil {
if k8sapierror.IsNotFound(err) {
log.V(1).Info("Ignoring cached workload that must have been deleted")
return ctrl.Result{}, nil
}
return ctrl.Result{}, fmt.Errorf("getting %s from cache: %w", workloadKind, err)
}
// Skip processing if it's a Pod controlled by a built-in K8s workload.
if workloadKind == kube.KindPod {
controller := metav1.GetControllerOf(workloadObj)
if kube.IsBuiltInWorkload(controller) {
log.V(1).Info("Ignoring managed pod", "controllerKind", controller.Kind, "controllerName", controller.Name)
return ctrl.Result{}, nil
}
}
if r.Config.VulnerabilityScannerScanOnlyCurrentRevisions && workloadKind == kube.KindReplicaSet {
controller := metav1.GetControllerOf(workloadObj)
activeReplicaSet, err := r.IsActiveReplicaSet(ctx, workloadObj, controller)
if err != nil {
return ctrl.Result{}, fmt.Errorf("failed checking current revision: %w", err)
}
if !activeReplicaSet {
log.V(1).Info("Ignoring inactive ReplicaSet", "controllerKind", controller.Kind, "controllerName", controller.Name)
return ctrl.Result{}, nil
}
}
// Skip processing if it's a Job controlled by CronJob.
if workloadKind == kube.KindJob {
controller := metav1.GetControllerOf(workloadObj)
if controller != nil && controller.Kind == string(kube.KindCronJob) {
log.V(1).Info("Ignoring managed job", "controllerKind", controller.Kind, "controllerName", controller.Name)
return ctrl.Result{}, nil
}
}
podSpec, err := kube.GetPodSpec(workloadObj)
if err != nil {
return ctrl.Result{}, err
}
containerImages := kube.GetContainerImagesFromPodSpec(podSpec)
hash := kube.ComputeHash(podSpec)
log = log.WithValues("podSpecHash", hash)
// Check if containers of the Pod have corresponding VulnerabilityReports.
hasReports, err := r.hasReports(ctx, workloadRef, hash, containerImages)
if err != nil {
return ctrl.Result{}, fmt.Errorf("getting vulnerability reports: %w", err)
}
if hasReports {
log.V(1).Info("VulnerabilityReports already exist")
return ctrl.Result{}, nil
}
_, job, err := r.hasActiveScanJob(ctx, workloadRef, hash)
if err != nil {
return ctrl.Result{}, fmt.Errorf("checking scan job: %w", err)
}
if job != nil {
log.V(1).Info("Scan job already exists",
"job", fmt.Sprintf("%s/%s", job.Namespace, job.Name))
return ctrl.Result{}, nil
}
limitExceeded, scanJobsCount, err := r.LimitChecker.Check(ctx)
if err != nil {
return ctrl.Result{}, err
}
log.V(1).Info("Checking scan jobs limit", "count", scanJobsCount, "limit", r.ConcurrentScanJobsLimit)
if limitExceeded {
log.V(1).Info("Pushing back scan job", "count", scanJobsCount, "retryAfter", r.ScanJobRetryAfter)
return ctrl.Result{RequeueAfter: r.Config.ScanJobRetryAfter}, nil
}
return ctrl.Result{}, r.submitScanJob(ctx, workloadObj)
}
}
func (r *WorkloadController) hasReports(ctx context.Context, owner kube.ObjectRef, hash string, images kube.ContainerImages) (bool, error) {
// TODO FindByOwner should accept optional label selector to further narrow down search results
list, err := r.FindByOwner(ctx, owner)
if err != nil {
return false, err
}
actual := map[string]bool{}
for _, report := range list {
if containerName, ok := report.Labels[starboard.LabelContainerName]; ok {
if hash == report.Labels[starboard.LabelResourceSpecHash] {
actual[containerName] = true
}
}
}
expected := map[string]bool{}
for containerName := range images {
expected[containerName] = true
}
return reflect.DeepEqual(actual, expected), nil
}
func (r *WorkloadController) hasActiveScanJob(ctx context.Context, owner kube.ObjectRef, hash string) (bool, *batchv1.Job, error) {
jobName := fmt.Sprintf("scan-vulnerabilityreport-%s", kube.ComputeHash(owner))
job := &batchv1.Job{}
err := r.Get(ctx, client.ObjectKey{Namespace: r.Config.Namespace, Name: jobName}, job)
if err != nil {
if k8sapierror.IsNotFound(err) {
return false, nil, nil
}
return false, nil, fmt.Errorf("getting job from cache: %w", err)
}
if job.Labels[starboard.LabelResourceSpecHash] == hash {
return true, job, nil
}
return false, nil, nil
}
func (r *WorkloadController) submitScanJob(ctx context.Context, owner client.Object) error {
log := r.Logger.WithValues("kind", owner.GetObjectKind().GroupVersionKind().Kind,
"name", owner.GetName(), "namespace", owner.GetNamespace())
credentials, err := r.CredentialsByWorkload(ctx, owner)
if err != nil {
return err
}
scanJobTolerations, err := r.GetScanJobTolerations()
if err != nil {
return fmt.Errorf("getting scan job tolerations: %w", err)
}
scanJobAnnotations, err := r.GetScanJobAnnotations()
if err != nil {
return fmt.Errorf("getting scan job annotations: %w", err)
}
scanJobPodTemplateLabels, err := r.GetScanJobPodTemplateLabels()
if err != nil {
return fmt.Errorf("getting scan job template labels: %w", err)
}
scanJob, secrets, err := NewScanJobBuilder().
WithPlugin(r.Plugin).
WithPluginContext(r.PluginContext).
WithTimeout(r.Config.ScanJobTimeout).
WithObject(owner).
WithTolerations(scanJobTolerations).
WithAnnotations(scanJobAnnotations).
WithPodTemplateLabels(scanJobPodTemplateLabels).
WithCredentials(credentials).
Get()
if err != nil {
if errors.Is(err, kube.ErrReplicaSetNotFound) || errors.Is(err, kube.ErrNoRunningPods) ||
errors.Is(err, kube.ErrUnSupportedKind) {
log.V(1).Info("ignoring vulnerability scan", "reason", err)
return nil
}
return fmt.Errorf("constructing scan job: %w", err)
}
for _, secret := range secrets {
err = r.Client.Create(ctx, secret)
if err != nil {
if k8sapierror.IsAlreadyExists(err) {
return nil
}
return fmt.Errorf("creating secret used by scan job failed: %s: %w", secret.Namespace+"/"+secret.Name, err)
}
}
err = r.Client.Create(ctx, scanJob)
if err != nil {
if k8sapierror.IsAlreadyExists(err) {
// TODO Delete secrets that were created in the previous step. Alternatively we can delete them on schedule.
return nil
}
return fmt.Errorf("creating scan job failed: %s: %w", scanJob.Namespace+"/"+scanJob.Name, err)
}
for _, secret := range secrets {
err = controllerutil.SetOwnerReference(scanJob, secret, r.Client.Scheme())
if err != nil {
return fmt.Errorf("setting owner reference: %w", err)
}
err := r.Client.Update(ctx, secret)
if err != nil {
return fmt.Errorf("setting owner reference of secret used by scan job failed: %s: %w", secret.Namespace+"/"+secret.Name, err)
}
}
return nil
}
func (r *WorkloadController) reconcileJobs() reconcile.Func {
return func(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
log := r.Logger.WithValues("job", req.NamespacedName)
job := &batchv1.Job{}
err := r.Client.Get(ctx, req.NamespacedName, job)
if err != nil {
if k8sapierror.IsNotFound(err) {
log.V(1).Info("Ignoring cached job that must have been deleted")
return ctrl.Result{}, nil
}
return ctrl.Result{}, fmt.Errorf("getting job from cache: %w", err)
}
if len(job.Status.Conditions) == 0 {
log.V(1).Info("Ignoring Job without conditions")
return ctrl.Result{}, nil
}
switch jobCondition := job.Status.Conditions[0].Type; jobCondition {
case batchv1.JobComplete:
err = r.processCompleteScanJob(ctx, job)
case batchv1.JobFailed:
err = r.processFailedScanJob(ctx, job)
default:
err = fmt.Errorf("unrecognized scan job condition: %v", jobCondition)
}
return ctrl.Result{}, err
}
}
func (r *WorkloadController) processCompleteScanJob(ctx context.Context, job *batchv1.Job) error {
log := r.Logger.WithValues("job", fmt.Sprintf("%s/%s", job.Namespace, job.Name))
ownerRef, err := kube.ObjectRefFromObjectMeta(job.ObjectMeta)
if err != nil {
return fmt.Errorf("getting owner ref from scan job metadata: %w", err)
}
owner, err := r.ObjectFromObjectRef(ctx, ownerRef)
if err != nil {
if k8sapierror.IsNotFound(err) {
log.V(1).Info("Report owner must have been deleted", "owner", owner)
return r.deleteJob(ctx, job)
}
return fmt.Errorf("getting object from object ref: %w", err)
}
containerImages, err := kube.GetContainerImagesFromJob(job)
if err != nil {
return fmt.Errorf("getting container images: %w", err)
}
podSpecHash, ok := job.Labels[starboard.LabelResourceSpecHash]
if !ok {
return fmt.Errorf("expected label %s not set", starboard.LabelResourceSpecHash)
}
hasReports, err := r.hasReports(ctx, ownerRef, podSpecHash, containerImages)
if err != nil {
return err
}
if hasReports {
log.V(1).Info("VulnerabilityReports already exist", "owner", owner)
log.V(1).Info("Deleting complete scan job", "owner", owner)
return r.deleteJob(ctx, job)
}
var vulnerabilityReports []v1alpha1.VulnerabilityReport
for containerName, containerImage := range containerImages {
logsStream, err := r.LogsReader.GetLogsByJobAndContainerName(ctx, job, containerName)
if err != nil {
if k8sapierror.IsNotFound(err) {
log.V(1).Info("Cached job must have been deleted")
return nil
}
if kube.IsPodControlledByJobNotFound(err) {
log.V(1).Info("Pod must have been deleted")
return r.deleteJob(ctx, job)
}
return fmt.Errorf("getting logs for pod %q: %w", job.Namespace+"/"+job.Name, err)
}
reportData, err := r.Plugin.ParseVulnerabilityReportData(r.PluginContext, containerImage, logsStream)
if err != nil {
return err
}
_ = logsStream.Close()
reportBuilder := NewReportBuilder(r.Client.Scheme()).
Controller(owner).
Container(containerName).
Data(reportData).
PodSpecHash(podSpecHash)
if r.Config.VulnerabilityScannerReportTTL != nil {
reportBuilder.ReportTTL(r.Config.VulnerabilityScannerReportTTL)
}
report, err := reportBuilder.Get()
if err != nil {
return err
}
vulnerabilityReports = append(vulnerabilityReports, report)
}
err = r.ReadWriter.Write(ctx, vulnerabilityReports)
if err != nil {
return err
}
log.V(1).Info("Deleting complete scan job", "owner", owner)
return r.deleteJob(ctx, job)
}
func (r *WorkloadController) processFailedScanJob(ctx context.Context, scanJob *batchv1.Job) error {
log := r.Logger.WithValues("job", fmt.Sprintf("%s/%s", scanJob.Namespace, scanJob.Name))
statuses, err := r.GetTerminatedContainersStatusesByJob(ctx, scanJob)
if err != nil {
if k8sapierror.IsNotFound(err) {
log.V(1).Info("Cached job must have been deleted")
return nil
}
if kube.IsPodControlledByJobNotFound(err) {
log.V(1).Info("Pod must have been deleted")
return r.deleteJob(ctx, scanJob)
}
return err
}
for container, status := range statuses {
if status.ExitCode == 0 {
continue
}
log.Error(nil, "Scan job container", "container", container, "status.reason", status.Reason, "status.message", status.Message)
}
log.V(1).Info("Deleting failed scan job")
return r.deleteJob(ctx, scanJob)
}
func (r *WorkloadController) deleteJob(ctx context.Context, job *batchv1.Job) error {
err := r.Client.Delete(ctx, job, client.PropagationPolicy(metav1.DeletePropagationBackground))
if err != nil {
if k8sapierror.IsNotFound(err) {
return nil
}
return fmt.Errorf("deleting job: %w", err)
}
return nil
}