/
main.go
384 lines (377 loc) · 13.5 KB
/
main.go
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package main
import (
"context"
"errors"
"flag"
"os"
"strings"
"sync"
"time"
"github.com/kyverno/kyverno/cmd/internal"
"github.com/kyverno/kyverno/pkg/client/clientset/versioned"
kyvernoinformer "github.com/kyverno/kyverno/pkg/client/informers/externalversions"
"github.com/kyverno/kyverno/pkg/clients/dclient"
"github.com/kyverno/kyverno/pkg/config"
globalcontextcontroller "github.com/kyverno/kyverno/pkg/controllers/globalcontext"
aggregatereportcontroller "github.com/kyverno/kyverno/pkg/controllers/report/aggregate"
backgroundscancontroller "github.com/kyverno/kyverno/pkg/controllers/report/background"
resourcereportcontroller "github.com/kyverno/kyverno/pkg/controllers/report/resource"
engineapi "github.com/kyverno/kyverno/pkg/engine/api"
"github.com/kyverno/kyverno/pkg/engine/apicall"
"github.com/kyverno/kyverno/pkg/engine/jmespath"
"github.com/kyverno/kyverno/pkg/event"
"github.com/kyverno/kyverno/pkg/globalcontext/store"
"github.com/kyverno/kyverno/pkg/leaderelection"
"github.com/kyverno/kyverno/pkg/logging"
kubeutils "github.com/kyverno/kyverno/pkg/utils/kube"
apiserver "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
"k8s.io/apimachinery/pkg/runtime/schema"
kubeinformers "k8s.io/client-go/informers"
admissionregistrationv1alpha1informers "k8s.io/client-go/informers/admissionregistration/v1alpha1"
metadatainformers "k8s.io/client-go/metadata/metadatainformer"
kyamlopenapi "sigs.k8s.io/kustomize/kyaml/openapi"
)
const (
resyncPeriod = 15 * time.Minute
)
func sanityChecks(apiserverClient apiserver.Interface) error {
return kubeutils.CRDsInstalled(apiserverClient,
"clusterpolicyreports.wgpolicyk8s.io",
"policyreports.wgpolicyk8s.io",
"clusterbackgroundscanreports.kyverno.io",
"backgroundscanreports.kyverno.io",
)
}
func createReportControllers(
eng engineapi.Engine,
backgroundScan bool,
admissionReports bool,
aggregateReports bool,
policyReports bool,
validatingAdmissionPolicyReports bool,
backgroundScanWorkers int,
client dclient.Interface,
kyvernoClient versioned.Interface,
metadataFactory metadatainformers.SharedInformerFactory,
kubeInformer kubeinformers.SharedInformerFactory,
kyvernoInformer kyvernoinformer.SharedInformerFactory,
backgroundScanInterval time.Duration,
configuration config.Configuration,
jp jmespath.Interface,
eventGenerator event.Interface,
) ([]internal.Controller, func(context.Context) error) {
var ctrls []internal.Controller
var warmups []func(context.Context) error
var vapInformer admissionregistrationv1alpha1informers.ValidatingAdmissionPolicyInformer
var vapBindingInformer admissionregistrationv1alpha1informers.ValidatingAdmissionPolicyBindingInformer
// check if validating admission policies are registered in the API server
if validatingAdmissionPolicyReports {
vapInformer = kubeInformer.Admissionregistration().V1alpha1().ValidatingAdmissionPolicies()
vapBindingInformer = kubeInformer.Admissionregistration().V1alpha1().ValidatingAdmissionPolicyBindings()
}
kyvernoV1 := kyvernoInformer.Kyverno().V1()
kyvernoV2beta1 := kyvernoInformer.Kyverno().V2beta1()
if backgroundScan || admissionReports {
resourceReportController := resourcereportcontroller.NewController(
client,
kyvernoV1.Policies(),
kyvernoV1.ClusterPolicies(),
vapInformer,
)
warmups = append(warmups, func(ctx context.Context) error {
return resourceReportController.Warmup(ctx)
})
ctrls = append(ctrls, internal.NewController(
resourcereportcontroller.ControllerName,
resourceReportController,
resourcereportcontroller.Workers,
))
if aggregateReports {
ctrls = append(ctrls, internal.NewController(
aggregatereportcontroller.ControllerName,
aggregatereportcontroller.NewController(
kyvernoClient,
client,
metadataFactory,
kyvernoV1.Policies(),
kyvernoV1.ClusterPolicies(),
vapInformer,
),
aggregatereportcontroller.Workers,
))
}
if backgroundScan {
backgroundScanController := backgroundscancontroller.NewController(
client,
kyvernoClient,
eng,
metadataFactory,
kyvernoV1.Policies(),
kyvernoV1.ClusterPolicies(),
kyvernoV2beta1.PolicyExceptions(),
vapInformer,
vapBindingInformer,
kubeInformer.Core().V1().Namespaces(),
resourceReportController,
backgroundScanInterval,
configuration,
jp,
eventGenerator,
policyReports,
)
ctrls = append(ctrls, internal.NewController(
backgroundscancontroller.ControllerName,
backgroundScanController,
backgroundScanWorkers),
)
}
}
return ctrls, func(ctx context.Context) error {
for _, warmup := range warmups {
if err := warmup(ctx); err != nil {
return err
}
}
return nil
}
}
func createrLeaderControllers(
eng engineapi.Engine,
backgroundScan bool,
admissionReports bool,
aggregateReports bool,
policyReports bool,
validatingAdmissionPolicyReports bool,
backgroundScanWorkers int,
kubeInformer kubeinformers.SharedInformerFactory,
kyvernoInformer kyvernoinformer.SharedInformerFactory,
metadataInformer metadatainformers.SharedInformerFactory,
kyvernoClient versioned.Interface,
dynamicClient dclient.Interface,
configuration config.Configuration,
jp jmespath.Interface,
eventGenerator event.Interface,
backgroundScanInterval time.Duration,
) ([]internal.Controller, func(context.Context) error, error) {
reportControllers, warmup := createReportControllers(
eng,
backgroundScan,
admissionReports,
aggregateReports,
policyReports,
validatingAdmissionPolicyReports,
backgroundScanWorkers,
dynamicClient,
kyvernoClient,
metadataInformer,
kubeInformer,
kyvernoInformer,
backgroundScanInterval,
configuration,
jp,
eventGenerator,
)
return reportControllers, warmup, nil
}
func main() {
var (
backgroundScan bool
admissionReports bool
aggregateReports bool
policyReports bool
validatingAdmissionPolicyReports bool
reportsChunkSize int
backgroundScanWorkers int
backgroundScanInterval time.Duration
maxQueuedEvents int
omitEvents string
skipResourceFilters bool
maxAPICallResponseLength int64
)
flagset := flag.NewFlagSet("reports-controller", flag.ExitOnError)
flagset.BoolVar(&backgroundScan, "backgroundScan", true, "Enable or disable background scan.")
flagset.BoolVar(&admissionReports, "admissionReports", true, "Enable or disable admission reports.")
flagset.BoolVar(&aggregateReports, "aggregateReports", true, "Enable or disable aggregated policy reports.")
flagset.BoolVar(&policyReports, "policyReports", true, "Enable or disable policy reports.")
flagset.BoolVar(&validatingAdmissionPolicyReports, "validatingAdmissionPolicyReports", false, "Enable or disable validating admission policy reports.")
flagset.IntVar(&reportsChunkSize, "reportsChunkSize", 0, "Max number of results in generated reports, reports will be split accordingly if there are more results to be stored.")
flagset.IntVar(&backgroundScanWorkers, "backgroundScanWorkers", backgroundscancontroller.Workers, "Configure the number of background scan workers.")
flagset.DurationVar(&backgroundScanInterval, "backgroundScanInterval", time.Hour, "Configure background scan interval.")
flagset.IntVar(&maxQueuedEvents, "maxQueuedEvents", 1000, "Maximum events to be queued.")
flagset.StringVar(&omitEvents, "omitEvents", "", "Set this flag to a comma separated list of PolicyViolation, PolicyApplied, PolicyError, PolicySkipped to disable events, e.g. --omitEvents=PolicyApplied,PolicyViolation")
flagset.BoolVar(&skipResourceFilters, "skipResourceFilters", true, "If true, resource filters wont be considered.")
flagset.Int64Var(&maxAPICallResponseLength, "maxAPICallResponseLength", 2*1000*1000, "Maximum allowed response size from API Calls. A value of 0 bypasses checks (not recommended).")
// config
appConfig := internal.NewConfiguration(
internal.WithProfiling(),
internal.WithMetrics(),
internal.WithTracing(),
internal.WithKubeconfig(),
internal.WithPolicyExceptions(),
internal.WithConfigMapCaching(),
internal.WithDeferredLoading(),
internal.WithCosign(),
internal.WithRegistryClient(),
internal.WithImageVerifyCache(),
internal.WithLeaderElection(),
internal.WithKyvernoClient(),
internal.WithDynamicClient(),
internal.WithMetadataClient(),
internal.WithKyvernoDynamicClient(),
internal.WithEventsClient(),
internal.WithApiServerClient(),
internal.WithFlagSets(flagset),
)
// parse flags
internal.ParseFlags(
appConfig,
internal.WithDefaultQps(300),
internal.WithDefaultBurst(300),
)
// setup
ctx, setup, sdown := internal.Setup(appConfig, "kyverno-reports-controller", skipResourceFilters)
defer sdown()
// show warnings
if reportsChunkSize != 0 {
logger := setup.Logger.WithName("wanings")
logger.Info("Warning: reportsChunkSize is deprecated and will be removed in 1.13.")
}
// THIS IS AN UGLY FIX
// ELSE KYAML IS NOT THREAD SAFE
kyamlopenapi.Schema()
if err := sanityChecks(setup.ApiServerClient); err != nil {
setup.Logger.Error(err, "sanity checks failed")
os.Exit(1)
}
setup.Logger.Info("background scan interval", "duration", backgroundScanInterval.String())
// check if validating admission policies are registered in the API server
if validatingAdmissionPolicyReports {
groupVersion := schema.GroupVersion{Group: "admissionregistration.k8s.io", Version: "v1alpha1"}
if _, err := setup.KyvernoDynamicClient.GetKubeClient().Discovery().ServerResourcesForGroupVersion(groupVersion.String()); err != nil {
setup.Logger.Error(err, "validating admission policies aren't supported.")
os.Exit(1)
}
}
// informer factories
kyvernoInformer := kyvernoinformer.NewSharedInformerFactory(setup.KyvernoClient, resyncPeriod)
var wg sync.WaitGroup
eventGenerator := event.NewEventGenerator(
setup.EventsClient,
logging.WithName("EventGenerator"),
maxQueuedEvents,
strings.Split(omitEvents, ",")...,
)
eventController := internal.NewController(
event.ControllerName,
eventGenerator,
event.Workers,
)
gcstore := store.New()
gceController := internal.NewController(
globalcontextcontroller.ControllerName,
globalcontextcontroller.NewController(
kyvernoInformer.Kyverno().V2alpha1().GlobalContextEntries(),
setup.KyvernoDynamicClient,
setup.KyvernoClient,
gcstore,
eventGenerator,
maxAPICallResponseLength,
false,
),
globalcontextcontroller.Workers,
)
// engine
engine := internal.NewEngine(
ctx,
setup.Logger,
setup.Configuration,
setup.MetricsConfiguration,
setup.Jp,
setup.KyvernoDynamicClient,
setup.RegistryClient,
setup.ImageVerifyCacheClient,
setup.KubeClient,
setup.KyvernoClient,
setup.RegistrySecretLister,
apicall.NewAPICallConfiguration(maxAPICallResponseLength),
gcstore,
)
// start informers and wait for cache sync
if !internal.StartInformersAndWaitForCacheSync(ctx, setup.Logger, kyvernoInformer) {
setup.Logger.Error(errors.New("failed to wait for cache sync"), "failed to wait for cache sync")
os.Exit(1)
}
// setup leader election
le, err := leaderelection.New(
setup.Logger.WithName("leader-election"),
"kyverno-reports-controller",
config.KyvernoNamespace(),
setup.LeaderElectionClient,
config.KyvernoPodName(),
internal.LeaderElectionRetryPeriod(),
func(ctx context.Context) {
logger := setup.Logger.WithName("leader")
// create leader factories
kubeInformer := kubeinformers.NewSharedInformerFactory(setup.KubeClient, resyncPeriod)
kubeKyvernoInformer := kubeinformers.NewSharedInformerFactoryWithOptions(setup.KubeClient, resyncPeriod, kubeinformers.WithNamespace(config.KyvernoNamespace()))
kyvernoInformer := kyvernoinformer.NewSharedInformerFactory(setup.KyvernoClient, resyncPeriod)
metadataInformer := metadatainformers.NewSharedInformerFactory(setup.MetadataClient, 15*time.Minute)
// create leader controllers
leaderControllers, warmup, err := createrLeaderControllers(
engine,
backgroundScan,
admissionReports,
aggregateReports,
policyReports,
validatingAdmissionPolicyReports,
backgroundScanWorkers,
kubeInformer,
kyvernoInformer,
metadataInformer,
setup.KyvernoClient,
setup.KyvernoDynamicClient,
setup.Configuration,
setup.Jp,
eventGenerator,
backgroundScanInterval,
)
if err != nil {
logger.Error(err, "failed to create leader controllers")
os.Exit(1)
}
// start informers and wait for cache sync
if !internal.StartInformersAndWaitForCacheSync(ctx, logger, kyvernoInformer, kubeInformer, kubeKyvernoInformer) {
logger.Error(errors.New("failed to wait for cache sync"), "failed to wait for cache sync")
os.Exit(1)
}
internal.StartInformers(ctx, metadataInformer)
if !internal.CheckCacheSync(logger, metadataInformer.WaitForCacheSync(ctx.Done())) {
logger.Error(errors.New("failed to wait for cache sync"), "failed to wait for cache sync")
os.Exit(1)
}
if err := warmup(ctx); err != nil {
logger.Error(err, "failed to run warmup")
os.Exit(1)
}
// start leader controllers
var wg sync.WaitGroup
for _, controller := range leaderControllers {
controller.Run(ctx, logger.WithName("controllers"), &wg)
}
// wait all controllers shut down
wg.Wait()
},
nil,
)
if err != nil {
setup.Logger.Error(err, "failed to initialize leader election")
os.Exit(1)
}
// start non leader controllers
eventController.Run(ctx, setup.Logger, &wg)
gceController.Run(ctx, setup.Logger, &wg)
// start leader election
le.Run(ctx)
// wait for everything to shut down and exit
wg.Wait()
}