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main.go
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main.go
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/*
Cleans up stale webhookconfigurations created by kyverno that were not cleanedup
*/
package main
import (
"context"
"encoding/json"
"flag"
"os"
"sync"
"time"
kyvernov1beta1 "github.com/kyverno/kyverno/api/kyverno/v1beta1"
kyvernoclient "github.com/kyverno/kyverno/pkg/client/clientset/versioned"
"github.com/kyverno/kyverno/pkg/config"
"github.com/kyverno/kyverno/pkg/dclient"
engineUtils "github.com/kyverno/kyverno/pkg/engine/utils"
"github.com/kyverno/kyverno/pkg/leaderelection"
"github.com/kyverno/kyverno/pkg/policyreport"
"github.com/kyverno/kyverno/pkg/signal"
"github.com/kyverno/kyverno/pkg/tls"
"github.com/kyverno/kyverno/pkg/utils"
admissionv1 "k8s.io/api/admission/v1"
coordinationv1 "k8s.io/api/coordination/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/klog/v2"
"k8s.io/klog/v2/klogr"
"sigs.k8s.io/controller-runtime/pkg/log"
)
var (
setupLog = log.Log.WithName("setup")
clientRateLimitQPS float64
clientRateLimitBurst int
updateLabelSelector = &metav1.LabelSelector{
MatchExpressions: []metav1.LabelSelectorRequirement{
{
Key: policyreport.LabelSelectorKey,
Operator: metav1.LabelSelectorOpDoesNotExist,
Values: []string{},
},
},
}
)
const (
policyReportKind string = "PolicyReport"
clusterPolicyReportKind string = "ClusterPolicyReport"
reportChangeRequestKind string = "ReportChangeRequest"
clusterReportChangeRequestKind string = "ClusterReportChangeRequest"
convertGenerateRequest string = "ConvertGenerateRequest"
)
func main() {
klog.InitFlags(nil)
log.SetLogger(klogr.New().WithCallDepth(1))
// arguments
flag.Float64Var(&clientRateLimitQPS, "clientRateLimitQPS", 0, "Configure the maximum QPS to the Kubernetes API server from Kyverno. Uses the client default if zero.")
flag.IntVar(&clientRateLimitBurst, "clientRateLimitBurst", 0, "Configure the maximum burst for throttle. Uses the client default if zero.")
if err := flag.Set("v", "2"); err != nil {
klog.Fatalf("failed to set log level: %v", err)
}
flag.Parse()
// os signal handler
stopCh := signal.SetupSignalHandler()
// create client config
clientConfig, err := rest.InClusterConfig()
if err != nil {
setupLog.Error(err, "Failed to create clientConfig")
os.Exit(1)
}
if err := config.ConfigureClientConfig(clientConfig, clientRateLimitQPS, clientRateLimitBurst); err != nil {
setupLog.Error(err, "Failed to create clientConfig")
os.Exit(1)
}
// DYNAMIC CLIENT
// - client for all registered resources
client, err := dclient.NewClient(clientConfig, 15*time.Minute, stopCh)
if err != nil {
setupLog.Error(err, "Failed to create client")
os.Exit(1)
}
kubeClient, err := kubernetes.NewForConfig(clientConfig)
if err != nil {
setupLog.Error(err, "Failed to create kubernetes client")
os.Exit(1)
}
pclient, err := kyvernoclient.NewForConfig(clientConfig)
if err != nil {
setupLog.Error(err, "Failed to create client")
os.Exit(1)
}
// Exit for unsupported version of kubernetes cluster
if !utils.HigherThanKubernetesVersion(kubeClient.Discovery(), log.Log, 1, 16, 0) {
os.Exit(1)
}
requests := []request{
{policyReportKind},
{clusterPolicyReportKind},
{reportChangeRequestKind},
{clusterReportChangeRequestKind},
{convertGenerateRequest},
}
ctx, cancel := context.WithCancel(context.Background())
go func() {
<-stopCh
cancel()
}()
addPolicyReportSelectorLabel(client)
addClusterPolicyReportSelectorLabel(client)
done := make(chan struct{})
defer close(done)
failure := false
run := func() {
name := tls.GenerateRootCASecretName()
_, err = kubeClient.CoreV1().Secrets(config.KyvernoNamespace()).Get(context.TODO(), name, metav1.GetOptions{})
if err != nil {
log.Log.Info("failed to fetch root CA secret", "name", name, "error", err.Error())
if !errors.IsNotFound(err) {
os.Exit(1)
}
}
name = tls.GenerateTLSPairSecretName()
_, err = kubeClient.CoreV1().Secrets(config.KyvernoNamespace()).Get(context.TODO(), name, metav1.GetOptions{})
if err != nil {
log.Log.Info("failed to fetch TLS Pair secret", "name", name, "error", err.Error())
if !errors.IsNotFound(err) {
os.Exit(1)
}
}
if err = acquireLeader(ctx, kubeClient); err != nil {
log.Log.Info("Failed to create lease 'kyvernopre-lock'")
os.Exit(1)
}
// use pipline to pass request to cleanup resources
in := gen(done, stopCh, requests...)
// process requests
// processing routine count : 2
p1 := process(client, pclient, done, stopCh, in)
p2 := process(client, pclient, done, stopCh, in)
// merge results from processing routines
for err := range merge(done, stopCh, p1, p2) {
if err != nil {
failure = true
log.Log.Error(err, "failed to cleanup resource")
}
}
// if there is any failure then we fail process
if failure {
log.Log.Info("failed to cleanup prior configurations")
os.Exit(1)
}
os.Exit(0)
}
le, err := leaderelection.New("kyvernopre", config.KyvernoNamespace(), kubeClient, run, nil, log.Log.WithName("kyvernopre/LeaderElection"))
if err != nil {
setupLog.Error(err, "failed to elect a leader")
os.Exit(1)
}
le.Run(ctx)
}
func acquireLeader(ctx context.Context, kubeClient kubernetes.Interface) error {
_, err := kubeClient.CoordinationV1().Leases(config.KyvernoNamespace()).Get(ctx, "kyvernopre-lock", metav1.GetOptions{})
if err != nil {
log.Log.Info("Lease 'kyvernopre-lock' not found. Starting clean-up...")
} else {
log.Log.Info("Leader was elected, quiting")
os.Exit(0)
}
lease := coordinationv1.Lease{
ObjectMeta: metav1.ObjectMeta{
Name: "kyvernopre-lock",
},
}
_, err = kubeClient.CoordinationV1().Leases(config.KyvernoNamespace()).Create(ctx, &lease, metav1.CreateOptions{})
return err
}
func executeRequest(client dclient.Interface, kyvernoclient kyvernoclient.Interface, req request) error {
switch req.kind {
case policyReportKind:
return removePolicyReport(client, req.kind)
case clusterPolicyReportKind:
return removeClusterPolicyReport(client, req.kind)
case reportChangeRequestKind:
return removeReportChangeRequest(client, req.kind)
case clusterReportChangeRequestKind:
return removeClusterReportChangeRequest(client, req.kind)
case convertGenerateRequest:
return convertGR(kyvernoclient)
}
return nil
}
type request struct {
kind string
}
/* Processing Pipeline
-> Process Requests
Generate Requests -> Process Requests -> Merge Results
-> Process Requests
- number of processes can be controlled
- stop processing on SIGTERM OR SIGNKILL signal
- stop processing if any process fails(supported)
*/
// Generates requests to be processed
func gen(done <-chan struct{}, stopCh <-chan struct{}, requests ...request) <-chan request {
out := make(chan request)
go func() {
defer close(out)
for _, req := range requests {
select {
case out <- req:
case <-done:
println("done generate")
return
case <-stopCh:
println("shutting down generate")
return
}
}
}()
return out
}
// processes the requests
func process(client dclient.Interface, kyvernoclient kyvernoclient.Interface, done <-chan struct{}, stopCh <-chan struct{}, requests <-chan request) <-chan error {
logger := log.Log.WithName("process")
out := make(chan error)
go func() {
defer close(out)
for req := range requests {
select {
case out <- executeRequest(client, kyvernoclient, req):
case <-done:
logger.Info("done")
return
case <-stopCh:
logger.Info("shutting down")
return
}
}
}()
return out
}
// waits for all processes to be complete and merges result
func merge(done <-chan struct{}, stopCh <-chan struct{}, processes ...<-chan error) <-chan error {
logger := log.Log.WithName("merge")
var wg sync.WaitGroup
out := make(chan error)
// gets the output from each process
output := func(ch <-chan error) {
defer wg.Done()
for err := range ch {
select {
case out <- err:
case <-done:
logger.Info("done")
return
case <-stopCh:
logger.Info("shutting down")
return
}
}
}
wg.Add(len(processes))
for _, process := range processes {
go output(process)
}
// close when all the process goroutines are done
go func() {
wg.Wait()
close(out)
}()
return out
}
func removeClusterPolicyReport(client dclient.Interface, kind string) error {
logger := log.Log.WithName("removeClusterPolicyReport")
cpolrs, err := client.ListResource("", kind, "", policyreport.LabelSelector)
if err != nil {
logger.Error(err, "failed to list clusterPolicyReport")
return nil
}
for _, cpolr := range cpolrs.Items {
deleteResource(client, cpolr.GetAPIVersion(), cpolr.GetKind(), "", cpolr.GetName())
}
return nil
}
func removePolicyReport(client dclient.Interface, kind string) error {
logger := log.Log.WithName("removePolicyReport")
polrs, err := client.ListResource("", kind, metav1.NamespaceAll, policyreport.LabelSelector)
if err != nil {
logger.Error(err, "failed to list policyReport")
return nil
}
for _, polr := range polrs.Items {
deleteResource(client, polr.GetAPIVersion(), polr.GetKind(), polr.GetNamespace(), polr.GetName())
}
return nil
}
func addClusterPolicyReportSelectorLabel(client dclient.Interface) {
logger := log.Log.WithName("addClusterPolicyReportSelectorLabel")
cpolrs, err := client.ListResource("", clusterPolicyReportKind, "", updateLabelSelector)
if err != nil {
logger.Error(err, "failed to list clusterPolicyReport")
return
}
for _, cpolr := range cpolrs.Items {
if cpolr.GetName() == policyreport.GeneratePolicyReportName("") {
addSelectorLabel(client, cpolr.GetAPIVersion(), cpolr.GetKind(), "", cpolr.GetName())
}
}
}
func addPolicyReportSelectorLabel(client dclient.Interface) {
logger := log.Log.WithName("addPolicyReportSelectorLabel")
polrs, err := client.ListResource("", policyReportKind, metav1.NamespaceAll, updateLabelSelector)
if err != nil {
logger.Error(err, "failed to list policyReport")
return
}
for _, polr := range polrs.Items {
if polr.GetName() == policyreport.GeneratePolicyReportName(polr.GetNamespace()) {
addSelectorLabel(client, polr.GetAPIVersion(), polr.GetKind(), polr.GetNamespace(), polr.GetName())
}
}
}
func removeReportChangeRequest(client dclient.Interface, kind string) error {
logger := log.Log.WithName("removeReportChangeRequest")
ns := config.KyvernoNamespace()
rcrList, err := client.ListResource("", kind, ns, nil)
if err != nil {
logger.Error(err, "failed to list reportChangeRequest")
return nil
}
for _, rcr := range rcrList.Items {
deleteResource(client, rcr.GetAPIVersion(), rcr.GetKind(), rcr.GetNamespace(), rcr.GetName())
}
return nil
}
func removeClusterReportChangeRequest(client dclient.Interface, kind string) error {
crcrList, err := client.ListResource("", kind, "", nil)
if err != nil {
log.Log.Error(err, "failed to list clusterReportChangeRequest")
return nil
}
for _, crcr := range crcrList.Items {
deleteResource(client, crcr.GetAPIVersion(), crcr.GetKind(), "", crcr.GetName())
}
return nil
}
func deleteResource(client dclient.Interface, apiversion, kind, ns, name string) {
err := client.DeleteResource(apiversion, kind, ns, name, false)
if err != nil && !errors.IsNotFound(err) {
log.Log.Error(err, "failed to delete resource", "kind", kind, "name", name)
return
}
log.Log.Info("successfully cleaned up resource", "kind", kind, "name", name)
}
func addSelectorLabel(client dclient.Interface, apiversion, kind, ns, name string) {
res, err := client.GetResource(apiversion, kind, ns, name)
if err != nil && !errors.IsNotFound(err) {
log.Log.Error(err, "failed to get resource", "kind", kind, "name", name)
return
}
l, err := metav1.LabelSelectorAsMap(policyreport.LabelSelector)
if err != nil {
log.Log.Error(err, "failed to convert labels", "labels", policyreport.LabelSelector)
return
}
res.SetLabels(labels.Merge(res.GetLabels(), l))
_, err = client.UpdateResource(apiversion, kind, ns, res, false)
if err != nil {
log.Log.Error(err, "failed to update resource", "kind", kind, "name", name)
return
}
log.Log.Info("successfully updated resource labels", "kind", kind, "name", name)
}
func convertGR(pclient kyvernoclient.Interface) error {
logger := log.Log.WithName("convertGenerateRequest")
var errors []error
grs, err := pclient.KyvernoV1().GenerateRequests(config.KyvernoNamespace()).List(context.TODO(), metav1.ListOptions{})
if err != nil {
logger.Error(err, "failed to list update requests")
return err
}
for _, gr := range grs.Items {
cp := gr.DeepCopy()
var request *admissionv1.AdmissionRequest
if cp.Spec.Context.AdmissionRequestInfo.AdmissionRequest != "" {
var r admissionv1.AdmissionRequest
err := json.Unmarshal([]byte(cp.Spec.Context.AdmissionRequestInfo.AdmissionRequest), &r)
if err != nil {
logger.Error(err, "failed to unmarshal admission request")
errors = append(errors, err)
continue
}
}
ur := &kyvernov1beta1.UpdateRequest{
ObjectMeta: metav1.ObjectMeta{
GenerateName: "ur-",
Namespace: config.KyvernoNamespace(),
Labels: cp.GetLabels(),
},
Spec: kyvernov1beta1.UpdateRequestSpec{
Type: kyvernov1beta1.Generate,
Policy: cp.Spec.Policy,
Resource: cp.Spec.Resource,
Context: kyvernov1beta1.UpdateRequestSpecContext{
UserRequestInfo: kyvernov1beta1.RequestInfo{
Roles: cp.Spec.Context.UserRequestInfo.Roles,
ClusterRoles: cp.Spec.Context.UserRequestInfo.ClusterRoles,
AdmissionUserInfo: cp.Spec.Context.UserRequestInfo.AdmissionUserInfo,
},
AdmissionRequestInfo: kyvernov1beta1.AdmissionRequestInfoObject{
AdmissionRequest: request,
Operation: cp.Spec.Context.AdmissionRequestInfo.Operation,
},
},
},
}
_, err := pclient.KyvernoV1beta1().UpdateRequests(config.KyvernoNamespace()).Create(context.TODO(), ur, metav1.CreateOptions{})
if err != nil {
logger.Info("failed to create UpdateRequest", "GR namespace", gr.GetNamespace(), "GR name", gr.GetName(), "err", err.Error())
errors = append(errors, err)
continue
} else {
logger.Info("successfully created UpdateRequest", "GR namespace", gr.GetNamespace(), "GR name", gr.GetName())
}
if err := pclient.KyvernoV1().GenerateRequests(config.KyvernoNamespace()).Delete(context.TODO(), gr.GetName(), metav1.DeleteOptions{}); err != nil {
errors = append(errors, err)
logger.Error(err, "failed to delete GR")
}
}
err = engineUtils.CombineErrors(errors)
return err
}