mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
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302 lines
8.9 KiB
Go
302 lines
8.9 KiB
Go
/*
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Copyright 2019 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 admissionwebhook
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import (
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"context"
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"crypto/tls"
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"crypto/x509"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"net/http/httptest"
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"net/url"
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"os"
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"sync"
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"testing"
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"time"
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"k8s.io/api/admission/v1beta1"
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admissionregistrationv1 "k8s.io/api/admissionregistration/v1"
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corev1 "k8s.io/api/core/v1"
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v1 "k8s.io/api/core/v1"
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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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"k8s.io/apimachinery/pkg/util/wait"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/client-go/rest"
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kubeapiservertesting "k8s.io/kubernetes/cmd/kube-apiserver/app/testing"
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"k8s.io/kubernetes/test/integration/framework"
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)
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const (
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testClientAuthClientUsername = "webhook-client-auth-integration-client"
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)
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// TestWebhookClientAuthWithAggregatorRouting ensures client auth is used for requests to URL backends
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func TestWebhookClientAuthWithAggregatorRouting(t *testing.T) {
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testWebhookClientAuth(t, true)
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}
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// TestWebhookClientAuthWithoutAggregatorRouting ensures client auth is used for requests to URL backends
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func TestWebhookClientAuthWithoutAggregatorRouting(t *testing.T) {
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testWebhookClientAuth(t, false)
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}
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func testWebhookClientAuth(t *testing.T, enableAggregatorRouting bool) {
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roots := x509.NewCertPool()
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if !roots.AppendCertsFromPEM(localhostCert) {
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t.Fatal("Failed to append Cert from PEM")
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}
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cert, err := tls.X509KeyPair(localhostCert, localhostKey)
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if err != nil {
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t.Fatalf("Failed to build cert with error: %+v", err)
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}
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recorder := &clientAuthRecorder{}
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webhookServer := httptest.NewUnstartedServer(newClientAuthWebhookHandler(t, recorder))
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webhookServer.TLS = &tls.Config{
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RootCAs: roots,
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Certificates: []tls.Certificate{cert},
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}
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webhookServer.StartTLS()
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defer webhookServer.Close()
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webhookServerURL, err := url.Parse(webhookServer.URL)
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if err != nil {
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t.Fatal(err)
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}
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kubeConfigFile, err := os.CreateTemp("", "admission-config.yaml")
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if err != nil {
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t.Fatal(err)
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}
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defer os.Remove(kubeConfigFile.Name())
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if err := os.WriteFile(kubeConfigFile.Name(), []byte(`
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apiVersion: v1
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kind: Config
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users:
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- name: "`+webhookServerURL.Host+`"
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user:
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token: "localhost-match-with-port"
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- name: "`+webhookServerURL.Hostname()+`"
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user:
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token: "localhost-match-without-port"
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- name: "*.localhost"
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user:
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token: "localhost-prefix"
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- name: "*"
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user:
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token: "fallback"
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`), os.FileMode(0755)); err != nil {
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t.Fatal(err)
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}
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admissionConfigFile, err := os.CreateTemp("", "admission-config.yaml")
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if err != nil {
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t.Fatal(err)
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}
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defer os.Remove(admissionConfigFile.Name())
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if err := os.WriteFile(admissionConfigFile.Name(), []byte(`
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apiVersion: apiserver.k8s.io/v1alpha1
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kind: AdmissionConfiguration
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plugins:
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- name: ValidatingAdmissionWebhook
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configuration:
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apiVersion: apiserver.config.k8s.io/v1alpha1
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kind: WebhookAdmission
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kubeConfigFile: "`+kubeConfigFile.Name()+`"
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- name: MutatingAdmissionWebhook
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configuration:
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apiVersion: apiserver.config.k8s.io/v1alpha1
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kind: WebhookAdmission
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kubeConfigFile: "`+kubeConfigFile.Name()+`"
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`), os.FileMode(0755)); err != nil {
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t.Fatal(err)
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}
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s := kubeapiservertesting.StartTestServerOrDie(t, kubeapiservertesting.NewDefaultTestServerOptions(), []string{
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"--disable-admission-plugins=ServiceAccount",
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fmt.Sprintf("--enable-aggregator-routing=%v", enableAggregatorRouting),
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"--admission-control-config-file=" + admissionConfigFile.Name(),
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}, framework.SharedEtcd())
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defer s.TearDownFn()
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// Configure a client with a distinct user name so that it is easy to distinguish requests
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// made by the client from requests made by controllers. We use this to filter out requests
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// before recording them to ensure we don't accidentally mistake requests from controllers
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// as requests made by the client.
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clientConfig := rest.CopyConfig(s.ClientConfig)
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clientConfig.Impersonate.UserName = testClientAuthClientUsername
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clientConfig.Impersonate.Groups = []string{"system:masters", "system:authenticated"}
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client, err := clientset.NewForConfig(clientConfig)
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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_, err = client.CoreV1().Pods("default").Create(context.TODO(), clientAuthMarkerFixture, metav1.CreateOptions{})
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if err != nil {
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t.Fatal(err)
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}
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upCh := recorder.Reset()
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ns := "load-balance"
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_, err = client.CoreV1().Namespaces().Create(context.TODO(), &v1.Namespace{ObjectMeta: metav1.ObjectMeta{Name: ns}}, metav1.CreateOptions{})
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if err != nil {
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t.Fatal(err)
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}
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fail := admissionregistrationv1.Fail
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mutatingCfg, err := client.AdmissionregistrationV1().MutatingWebhookConfigurations().Create(context.TODO(), &admissionregistrationv1.MutatingWebhookConfiguration{
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ObjectMeta: metav1.ObjectMeta{Name: "admission.integration.test"},
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Webhooks: []admissionregistrationv1.MutatingWebhook{{
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Name: "admission.integration.test",
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ClientConfig: admissionregistrationv1.WebhookClientConfig{
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URL: &webhookServer.URL,
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CABundle: localhostCert,
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},
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Rules: []admissionregistrationv1.RuleWithOperations{{
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Operations: []admissionregistrationv1.OperationType{admissionregistrationv1.OperationAll},
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Rule: admissionregistrationv1.Rule{APIGroups: []string{""}, APIVersions: []string{"v1"}, Resources: []string{"pods"}},
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}},
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FailurePolicy: &fail,
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AdmissionReviewVersions: []string{"v1beta1"},
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SideEffects: &noSideEffects,
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}},
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}, metav1.CreateOptions{})
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if err != nil {
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t.Fatal(err)
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}
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defer func() {
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err := client.AdmissionregistrationV1().MutatingWebhookConfigurations().Delete(context.TODO(), mutatingCfg.GetName(), metav1.DeleteOptions{})
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if err != nil {
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t.Fatal(err)
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}
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}()
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// wait until new webhook is called
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if err := wait.PollImmediate(time.Millisecond*5, wait.ForeverTestTimeout, func() (bool, error) {
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_, err = client.CoreV1().Pods("default").Patch(context.TODO(), clientAuthMarkerFixture.Name, types.JSONPatchType, []byte("[]"), metav1.PatchOptions{})
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if t.Failed() {
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return true, nil
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}
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select {
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case <-upCh:
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return true, nil
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default:
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t.Logf("Waiting for webhook to become effective, getting marker object: %v", err)
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return false, nil
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}
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}); err != nil {
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t.Fatal(err)
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}
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}
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type clientAuthRecorder struct {
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mu sync.Mutex
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upCh chan struct{}
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upOnce sync.Once
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}
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// Reset zeros out all counts and returns a channel that is closed when the first admission of the
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// marker object is received.
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func (i *clientAuthRecorder) Reset() chan struct{} {
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i.mu.Lock()
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defer i.mu.Unlock()
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i.upCh = make(chan struct{})
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i.upOnce = sync.Once{}
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return i.upCh
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}
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func (i *clientAuthRecorder) MarkerReceived() {
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i.mu.Lock()
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defer i.mu.Unlock()
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i.upOnce.Do(func() {
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close(i.upCh)
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})
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}
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func newClientAuthWebhookHandler(t *testing.T, recorder *clientAuthRecorder) http.Handler {
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allow := func(w http.ResponseWriter) {
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(&v1beta1.AdmissionReview{
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Response: &v1beta1.AdmissionResponse{
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Allowed: true,
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},
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})
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}
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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defer r.Body.Close()
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data, err := io.ReadAll(r.Body)
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if err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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}
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review := v1beta1.AdmissionReview{}
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if err := json.Unmarshal(data, &review); err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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}
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if review.Request.UserInfo.Username != testClientAuthClientUsername {
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// skip requests not originating from this integration test's client
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allow(w)
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return
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}
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if authz := r.Header.Get("Authorization"); authz != "Bearer localhost-match-with-port" {
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t.Errorf("unexpected authz header: %q", authz)
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http.Error(w, "Invalid auth", http.StatusUnauthorized)
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return
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}
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if len(review.Request.Object.Raw) == 0 {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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pod := &corev1.Pod{}
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if err := json.Unmarshal(review.Request.Object.Raw, pod); err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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// When resetting between tests, a marker object is patched until this webhook
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// observes it, at which point it is considered ready.
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if pod.Namespace == clientAuthMarkerFixture.Namespace && pod.Name == clientAuthMarkerFixture.Name {
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recorder.MarkerReceived()
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allow(w)
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return
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}
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})
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}
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var clientAuthMarkerFixture = &corev1.Pod{
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ObjectMeta: metav1.ObjectMeta{
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Namespace: "default",
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Name: "marker",
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},
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Spec: corev1.PodSpec{
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Containers: []v1.Container{{
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Name: "fake-name",
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Image: "fakeimage",
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}},
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},
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}
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