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webhook.go
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webhook.go
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/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package apimachinery
import (
"context"
"encoding/json"
"fmt"
"reflect"
"strings"
"time"
"k8s.io/utils/pointer"
admissionregistrationv1 "k8s.io/api/admissionregistration/v1"
appsv1 "k8s.io/api/apps/v1"
v1 "k8s.io/api/core/v1"
rbacv1 "k8s.io/api/rbac/v1"
apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
crdclientset "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/apimachinery/pkg/util/uuid"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/dynamic"
clientset "k8s.io/client-go/kubernetes"
"k8s.io/client-go/util/retry"
"k8s.io/kubernetes/test/e2e/framework"
e2edeployment "k8s.io/kubernetes/test/e2e/framework/deployment"
e2epod "k8s.io/kubernetes/test/e2e/framework/pod"
"k8s.io/kubernetes/test/utils/crd"
imageutils "k8s.io/kubernetes/test/utils/image"
admissionapi "k8s.io/pod-security-admission/api"
"github.com/onsi/ginkgo/v2"
// ensure libs have a chance to initialize
_ "github.com/stretchr/testify/assert"
)
const (
secretName = "sample-webhook-secret"
deploymentName = "sample-webhook-deployment"
serviceName = "e2e-test-webhook"
roleBindingName = "webhook-auth-reader"
skipNamespaceLabelKey = "skip-webhook-admission"
skipNamespaceLabelValue = "yes"
skippedNamespaceName = "exempted-namesapce"
disallowedPodName = "disallowed-pod"
toBeAttachedPodName = "to-be-attached-pod"
hangingPodName = "hanging-pod"
disallowedConfigMapName = "disallowed-configmap"
allowedConfigMapName = "allowed-configmap"
failNamespaceLabelKey = "fail-closed-webhook"
failNamespaceLabelValue = "yes"
failNamespaceName = "fail-closed-namesapce"
addedLabelKey = "added-label"
addedLabelValue = "yes"
)
var _ = SIGDescribe("AdmissionWebhook [Privileged:ClusterAdmin]", func() {
var certCtx *certContext
f := framework.NewDefaultFramework("webhook")
f.NamespacePodSecurityEnforceLevel = admissionapi.LevelBaseline
servicePort := int32(8443)
containerPort := int32(8444)
var client clientset.Interface
var namespaceName string
ginkgo.BeforeEach(func() {
client = f.ClientSet
namespaceName = f.Namespace.Name
// Make sure the namespace created for the test is labeled to be selected by the webhooks
labelNamespace(f, f.Namespace.Name)
createWebhookConfigurationReadyNamespace(f)
ginkgo.By("Setting up server cert")
certCtx = setupServerCert(namespaceName, serviceName)
createAuthReaderRoleBinding(f, namespaceName)
deployWebhookAndService(f, imageutils.GetE2EImage(imageutils.Agnhost), certCtx, servicePort, containerPort)
})
ginkgo.AfterEach(func() {
cleanWebhookTest(client, namespaceName)
})
/*
Release: v1.16
Testname: Admission webhook, discovery document
Description: The admissionregistration.k8s.io API group MUST exists in the /apis discovery document.
The admissionregistration.k8s.io/v1 API group/version MUST exists in the /apis discovery document.
The mutatingwebhookconfigurations and validatingwebhookconfigurations resources MUST exist in the
/apis/admissionregistration.k8s.io/v1 discovery document.
*/
framework.ConformanceIt("should include webhook resources in discovery documents", func() {
{
ginkgo.By("fetching the /apis discovery document")
apiGroupList := &metav1.APIGroupList{}
err := client.Discovery().RESTClient().Get().AbsPath("/apis").Do(context.TODO()).Into(apiGroupList)
framework.ExpectNoError(err, "fetching /apis")
ginkgo.By("finding the admissionregistration.k8s.io API group in the /apis discovery document")
var group *metav1.APIGroup
for _, g := range apiGroupList.Groups {
if g.Name == admissionregistrationv1.GroupName {
group = &g
break
}
}
framework.ExpectNotEqual(group, nil, "admissionregistration.k8s.io API group not found in /apis discovery document")
ginkgo.By("finding the admissionregistration.k8s.io/v1 API group/version in the /apis discovery document")
var version *metav1.GroupVersionForDiscovery
for _, v := range group.Versions {
if v.Version == admissionregistrationv1.SchemeGroupVersion.Version {
version = &v
break
}
}
framework.ExpectNotEqual(version, nil, "admissionregistration.k8s.io/v1 API group version not found in /apis discovery document")
}
{
ginkgo.By("fetching the /apis/admissionregistration.k8s.io discovery document")
group := &metav1.APIGroup{}
err := client.Discovery().RESTClient().Get().AbsPath("/apis/admissionregistration.k8s.io").Do(context.TODO()).Into(group)
framework.ExpectNoError(err, "fetching /apis/admissionregistration.k8s.io")
framework.ExpectEqual(group.Name, admissionregistrationv1.GroupName, "verifying API group name in /apis/admissionregistration.k8s.io discovery document")
ginkgo.By("finding the admissionregistration.k8s.io/v1 API group/version in the /apis/admissionregistration.k8s.io discovery document")
var version *metav1.GroupVersionForDiscovery
for _, v := range group.Versions {
if v.Version == admissionregistrationv1.SchemeGroupVersion.Version {
version = &v
break
}
}
framework.ExpectNotEqual(version, nil, "admissionregistration.k8s.io/v1 API group version not found in /apis/admissionregistration.k8s.io discovery document")
}
{
ginkgo.By("fetching the /apis/admissionregistration.k8s.io/v1 discovery document")
apiResourceList := &metav1.APIResourceList{}
err := client.Discovery().RESTClient().Get().AbsPath("/apis/admissionregistration.k8s.io/v1").Do(context.TODO()).Into(apiResourceList)
framework.ExpectNoError(err, "fetching /apis/admissionregistration.k8s.io/v1")
framework.ExpectEqual(apiResourceList.GroupVersion, admissionregistrationv1.SchemeGroupVersion.String(), "verifying API group/version in /apis/admissionregistration.k8s.io/v1 discovery document")
ginkgo.By("finding mutatingwebhookconfigurations and validatingwebhookconfigurations resources in the /apis/admissionregistration.k8s.io/v1 discovery document")
var (
mutatingWebhookResource *metav1.APIResource
validatingWebhookResource *metav1.APIResource
)
for i := range apiResourceList.APIResources {
if apiResourceList.APIResources[i].Name == "mutatingwebhookconfigurations" {
mutatingWebhookResource = &apiResourceList.APIResources[i]
}
if apiResourceList.APIResources[i].Name == "validatingwebhookconfigurations" {
validatingWebhookResource = &apiResourceList.APIResources[i]
}
}
framework.ExpectNotEqual(mutatingWebhookResource, nil, "mutatingwebhookconfigurations resource not found in /apis/admissionregistration.k8s.io/v1 discovery document")
framework.ExpectNotEqual(validatingWebhookResource, nil, "validatingwebhookconfigurations resource not found in /apis/admissionregistration.k8s.io/v1 discovery document")
}
})
/*
Release: v1.16
Testname: Admission webhook, deny create
Description: Register an admission webhook configuration that admits pod and configmap. Attempts to create
non-compliant pods and configmaps, or update/patch compliant pods and configmaps to be non-compliant MUST
be denied. An attempt to create a pod that causes a webhook to hang MUST result in a webhook timeout error,
and the pod creation MUST be denied. An attempt to create a non-compliant configmap in a whitelisted
namespace based on the webhook namespace selector MUST be allowed.
*/
framework.ConformanceIt("should be able to deny pod and configmap creation", func() {
webhookCleanup := registerWebhook(f, f.UniqueName, certCtx, servicePort)
defer webhookCleanup()
testWebhook(f)
})
/*
Release: v1.16
Testname: Admission webhook, deny attach
Description: Register an admission webhook configuration that denies connecting to a pod's attach sub-resource.
Attempts to attach MUST be denied.
*/
framework.ConformanceIt("should be able to deny attaching pod", func() {
webhookCleanup := registerWebhookForAttachingPod(f, f.UniqueName, certCtx, servicePort)
defer webhookCleanup()
testAttachingPodWebhook(f)
})
/*
Release: v1.16
Testname: Admission webhook, deny custom resource create and delete
Description: Register an admission webhook configuration that denies creation, update and deletion of
custom resources. Attempts to create, update and delete custom resources MUST be denied.
*/
framework.ConformanceIt("should be able to deny custom resource creation, update and deletion", func() {
testcrd, err := crd.CreateTestCRD(f)
if err != nil {
return
}
defer testcrd.CleanUp()
webhookCleanup := registerWebhookForCustomResource(f, f.UniqueName, certCtx, testcrd, servicePort)
defer webhookCleanup()
testCustomResourceWebhook(f, testcrd.Crd, testcrd.DynamicClients["v1"])
testBlockingCustomResourceUpdateDeletion(f, testcrd.Crd, testcrd.DynamicClients["v1"])
})
/*
Release: v1.16
Testname: Admission webhook, fail closed
Description: Register a webhook with a fail closed policy and without CA bundle so that it cannot be called.
Attempt operations that require the admission webhook; all MUST be denied.
*/
framework.ConformanceIt("should unconditionally reject operations on fail closed webhook", func() {
webhookCleanup := registerFailClosedWebhook(f, f.UniqueName, certCtx, servicePort)
defer webhookCleanup()
testFailClosedWebhook(f)
})
/*
Release: v1.16
Testname: Admission webhook, ordered mutation
Description: Register a mutating webhook configuration with two webhooks that admit configmaps, one that
adds a data key if the configmap already has a specific key, and another that adds a key if the key added by
the first webhook is present. Attempt to create a config map; both keys MUST be added to the config map.
*/
framework.ConformanceIt("should mutate configmap", func() {
webhookCleanup := registerMutatingWebhookForConfigMap(f, f.UniqueName, certCtx, servicePort)
defer webhookCleanup()
testMutatingConfigMapWebhook(f)
})
/*
Release: v1.16
Testname: Admission webhook, mutation with defaulting
Description: Register a mutating webhook that adds an InitContainer to pods. Attempt to create a pod;
the InitContainer MUST be added the TerminationMessagePolicy MUST be defaulted.
*/
framework.ConformanceIt("should mutate pod and apply defaults after mutation", func() {
webhookCleanup := registerMutatingWebhookForPod(f, f.UniqueName, certCtx, servicePort)
defer webhookCleanup()
testMutatingPodWebhook(f)
})
/*
Release: v1.16
Testname: Admission webhook, admission control not allowed on webhook configuration objects
Description: Register webhooks that mutate and deny deletion of webhook configuration objects. Attempt to create
and delete a webhook configuration object; both operations MUST be allowed and the webhook configuration object
MUST NOT be mutated the webhooks.
*/
framework.ConformanceIt("should not be able to mutate or prevent deletion of webhook configuration objects", func() {
validatingWebhookCleanup := registerValidatingWebhookForWebhookConfigurations(f, f.UniqueName+"blocking", certCtx, servicePort)
defer validatingWebhookCleanup()
mutatingWebhookCleanup := registerMutatingWebhookForWebhookConfigurations(f, f.UniqueName+"blocking", certCtx, servicePort)
defer mutatingWebhookCleanup()
testWebhooksForWebhookConfigurations(f, f.UniqueName, certCtx, servicePort)
})
/*
Release: v1.16
Testname: Admission webhook, mutate custom resource
Description: Register a webhook that mutates a custom resource. Attempt to create custom resource object;
the custom resource MUST be mutated.
*/
framework.ConformanceIt("should mutate custom resource", func() {
testcrd, err := crd.CreateTestCRD(f)
if err != nil {
return
}
defer testcrd.CleanUp()
webhookCleanup := registerMutatingWebhookForCustomResource(f, f.UniqueName, certCtx, testcrd, servicePort)
defer webhookCleanup()
testMutatingCustomResourceWebhook(f, testcrd.Crd, testcrd.DynamicClients["v1"], false)
})
/*
Release: v1.16
Testname: Admission webhook, deny custom resource definition
Description: Register a webhook that denies custom resource definition create. Attempt to create a
custom resource definition; the create request MUST be denied.
*/
framework.ConformanceIt("should deny crd creation", func() {
crdWebhookCleanup := registerValidatingWebhookForCRD(f, f.UniqueName, certCtx, servicePort)
defer crdWebhookCleanup()
testCRDDenyWebhook(f)
})
/*
Release: v1.16
Testname: Admission webhook, mutate custom resource with different stored version
Description: Register a webhook that mutates custom resources on create and update. Register a custom resource
definition using v1 as stored version. Create a custom resource. Patch the custom resource definition to use v2 as
the stored version. Attempt to patch the custom resource with a new field and value; the patch MUST be applied
successfully.
*/
framework.ConformanceIt("should mutate custom resource with different stored version", func() {
testcrd, err := createAdmissionWebhookMultiVersionTestCRDWithV1Storage(f)
if err != nil {
return
}
defer testcrd.CleanUp()
webhookCleanup := registerMutatingWebhookForCustomResource(f, f.UniqueName, certCtx, testcrd, servicePort)
defer webhookCleanup()
testMultiVersionCustomResourceWebhook(f, testcrd)
})
/*
Release: v1.16
Testname: Admission webhook, mutate custom resource with pruning
Description: Register mutating webhooks that adds fields to custom objects. Register a custom resource definition
with a schema that includes only one of the data keys added by the webhooks. Attempt to a custom resource;
the fields included in the schema MUST be present and field not included in the schema MUST NOT be present.
*/
framework.ConformanceIt("should mutate custom resource with pruning", func() {
const prune = true
testcrd, err := createAdmissionWebhookMultiVersionTestCRDWithV1Storage(f, func(crd *apiextensionsv1.CustomResourceDefinition) {
crd.Spec.PreserveUnknownFields = false
for i := range crd.Spec.Versions {
crd.Spec.Versions[i].Schema = &apiextensionsv1.CustomResourceValidation{
OpenAPIV3Schema: &apiextensionsv1.JSONSchemaProps{
Type: "object",
Properties: map[string]apiextensionsv1.JSONSchemaProps{
"data": {
Type: "object",
Properties: map[string]apiextensionsv1.JSONSchemaProps{
"mutation-start": {Type: "string"},
"mutation-stage-1": {Type: "string"},
// mutation-stage-2 is intentionally missing such that it is pruned
},
},
},
},
}
}
})
if err != nil {
return
}
defer testcrd.CleanUp()
webhookCleanup := registerMutatingWebhookForCustomResource(f, f.UniqueName, certCtx, testcrd, servicePort)
defer webhookCleanup()
testMutatingCustomResourceWebhook(f, testcrd.Crd, testcrd.DynamicClients["v1"], prune)
})
/*
Release: v1.16
Testname: Admission webhook, honor timeout
Description: Using a webhook that waits 5 seconds before admitting objects, configure the webhook with combinations
of timeouts and failure policy values. Attempt to create a config map with each combination. Requests MUST
timeout if the configured webhook timeout is less than 5 seconds and failure policy is fail. Requests must not timeout if
the failure policy is ignore. Requests MUST NOT timeout if configured webhook timeout is 10 seconds (much longer
than the webhook wait duration).
*/
framework.ConformanceIt("should honor timeout", func() {
policyFail := admissionregistrationv1.Fail
policyIgnore := admissionregistrationv1.Ignore
ginkgo.By("Setting timeout (1s) shorter than webhook latency (5s)")
slowWebhookCleanup := registerSlowWebhook(f, f.UniqueName, certCtx, &policyFail, pointer.Int32Ptr(1), servicePort)
testSlowWebhookTimeoutFailEarly(f)
slowWebhookCleanup()
ginkgo.By("Having no error when timeout is shorter than webhook latency and failure policy is ignore")
slowWebhookCleanup = registerSlowWebhook(f, f.UniqueName, certCtx, &policyIgnore, pointer.Int32Ptr(1), servicePort)
testSlowWebhookTimeoutNoError(f)
slowWebhookCleanup()
ginkgo.By("Having no error when timeout is longer than webhook latency")
slowWebhookCleanup = registerSlowWebhook(f, f.UniqueName, certCtx, &policyFail, pointer.Int32Ptr(10), servicePort)
testSlowWebhookTimeoutNoError(f)
slowWebhookCleanup()
ginkgo.By("Having no error when timeout is empty (defaulted to 10s in v1)")
slowWebhookCleanup = registerSlowWebhook(f, f.UniqueName, certCtx, &policyFail, nil, servicePort)
testSlowWebhookTimeoutNoError(f)
slowWebhookCleanup()
})
/*
Release: v1.16
Testname: Admission webhook, update validating webhook
Description: Register a validating admission webhook configuration. Update the webhook to not apply to the create
operation and attempt to create an object; the webhook MUST NOT deny the create. Patch the webhook to apply to the
create operation again and attempt to create an object; the webhook MUST deny the create.
*/
framework.ConformanceIt("patching/updating a validating webhook should work", func() {
client := f.ClientSet
admissionClient := client.AdmissionregistrationV1()
ginkgo.By("Creating a validating webhook configuration")
hook, err := createValidatingWebhookConfiguration(f, &admissionregistrationv1.ValidatingWebhookConfiguration{
ObjectMeta: metav1.ObjectMeta{
Name: f.UniqueName,
},
Webhooks: []admissionregistrationv1.ValidatingWebhook{
newDenyConfigMapWebhookFixture(f, certCtx, servicePort),
newValidatingIsReadyWebhookFixture(f, certCtx, servicePort),
},
})
framework.ExpectNoError(err, "Creating validating webhook configuration")
defer func() {
err := client.AdmissionregistrationV1().ValidatingWebhookConfigurations().Delete(context.TODO(), hook.Name, metav1.DeleteOptions{})
framework.ExpectNoError(err, "Deleting validating webhook configuration")
}()
// ensure backend is ready before proceeding
err = waitWebhookConfigurationReady(f)
framework.ExpectNoError(err, "waiting for webhook configuration to be ready")
ginkgo.By("Creating a configMap that does not comply to the validation webhook rules")
err = wait.PollImmediate(100*time.Millisecond, 30*time.Second, func() (bool, error) {
cm := namedNonCompliantConfigMap(string(uuid.NewUUID()), f)
_, err = client.CoreV1().ConfigMaps(f.Namespace.Name).Create(context.TODO(), cm, metav1.CreateOptions{})
if err == nil {
err = client.CoreV1().ConfigMaps(f.Namespace.Name).Delete(context.TODO(), cm.Name, metav1.DeleteOptions{})
framework.ExpectNoError(err, "Deleting successfully created configMap")
return false, nil
}
if !strings.Contains(err.Error(), "denied") {
return false, err
}
return true, nil
})
ginkgo.By("Updating a validating webhook configuration's rules to not include the create operation")
err = retry.RetryOnConflict(retry.DefaultRetry, func() error {
h, err := admissionClient.ValidatingWebhookConfigurations().Get(context.TODO(), f.UniqueName, metav1.GetOptions{})
framework.ExpectNoError(err, "Getting validating webhook configuration")
h.Webhooks[0].Rules[0].Operations = []admissionregistrationv1.OperationType{admissionregistrationv1.Update}
_, err = admissionClient.ValidatingWebhookConfigurations().Update(context.TODO(), h, metav1.UpdateOptions{})
return err
})
framework.ExpectNoError(err, "Updating validating webhook configuration")
ginkgo.By("Creating a configMap that does not comply to the validation webhook rules")
err = wait.PollImmediate(100*time.Millisecond, 30*time.Second, func() (bool, error) {
cm := namedNonCompliantConfigMap(string(uuid.NewUUID()), f)
_, err = client.CoreV1().ConfigMaps(f.Namespace.Name).Create(context.TODO(), cm, metav1.CreateOptions{})
if err != nil {
if !strings.Contains(err.Error(), "denied") {
return false, err
}
return false, nil
}
err = client.CoreV1().ConfigMaps(f.Namespace.Name).Delete(context.TODO(), cm.Name, metav1.DeleteOptions{})
framework.ExpectNoError(err, "Deleting successfully created configMap")
return true, nil
})
framework.ExpectNoError(err, "Waiting for configMap in namespace %s to be allowed creation since webhook was updated to not validate create", f.Namespace.Name)
ginkgo.By("Patching a validating webhook configuration's rules to include the create operation")
hook, err = admissionClient.ValidatingWebhookConfigurations().Patch(context.TODO(), f.UniqueName,
types.JSONPatchType,
[]byte(`[{"op": "replace", "path": "/webhooks/0/rules/0/operations", "value": ["CREATE"]}]`), metav1.PatchOptions{})
framework.ExpectNoError(err, "Patching validating webhook configuration")
ginkgo.By("Creating a configMap that does not comply to the validation webhook rules")
err = wait.PollImmediate(100*time.Millisecond, 30*time.Second, func() (bool, error) {
cm := namedNonCompliantConfigMap(string(uuid.NewUUID()), f)
_, err = client.CoreV1().ConfigMaps(f.Namespace.Name).Create(context.TODO(), cm, metav1.CreateOptions{})
if err == nil {
err = client.CoreV1().ConfigMaps(f.Namespace.Name).Delete(context.TODO(), cm.Name, metav1.DeleteOptions{})
framework.ExpectNoError(err, "Deleting successfully created configMap")
return false, nil
}
if !strings.Contains(err.Error(), "denied") {
return false, err
}
return true, nil
})
framework.ExpectNoError(err, "Waiting for configMap in namespace %s to be denied creation by validating webhook", f.Namespace.Name)
})
/*
Release: v1.16
Testname: Admission webhook, update mutating webhook
Description: Register a mutating admission webhook configuration. Update the webhook to not apply to the create
operation and attempt to create an object; the webhook MUST NOT mutate the object. Patch the webhook to apply to the
create operation again and attempt to create an object; the webhook MUST mutate the object.
*/
framework.ConformanceIt("patching/updating a mutating webhook should work", func() {
client := f.ClientSet
admissionClient := client.AdmissionregistrationV1()
ginkgo.By("Creating a mutating webhook configuration")
hook, err := createMutatingWebhookConfiguration(f, &admissionregistrationv1.MutatingWebhookConfiguration{
ObjectMeta: metav1.ObjectMeta{
Name: f.UniqueName,
},
Webhooks: []admissionregistrationv1.MutatingWebhook{
newMutateConfigMapWebhookFixture(f, certCtx, 1, servicePort),
newMutatingIsReadyWebhookFixture(f, certCtx, servicePort),
},
})
framework.ExpectNoError(err, "Creating mutating webhook configuration")
defer func() {
err := client.AdmissionregistrationV1().MutatingWebhookConfigurations().Delete(context.TODO(), hook.Name, metav1.DeleteOptions{})
framework.ExpectNoError(err, "Deleting mutating webhook configuration")
}()
// ensure backend is ready before proceeding
err = waitWebhookConfigurationReady(f)
framework.ExpectNoError(err, "waiting for webhook configuration to be ready")
hook, err = admissionClient.MutatingWebhookConfigurations().Get(context.TODO(), f.UniqueName, metav1.GetOptions{})
framework.ExpectNoError(err, "Getting mutating webhook configuration")
ginkgo.By("Updating a mutating webhook configuration's rules to not include the create operation")
hook.Webhooks[0].Rules[0].Operations = []admissionregistrationv1.OperationType{admissionregistrationv1.Update}
hook, err = admissionClient.MutatingWebhookConfigurations().Update(context.TODO(), hook, metav1.UpdateOptions{})
framework.ExpectNoError(err, "Updating mutating webhook configuration")
ginkgo.By("Creating a configMap that should not be mutated")
err = wait.PollImmediate(100*time.Millisecond, 30*time.Second, func() (bool, error) {
cm := namedToBeMutatedConfigMap(string(uuid.NewUUID()), f)
created, err := client.CoreV1().ConfigMaps(f.Namespace.Name).Create(context.TODO(), cm, metav1.CreateOptions{})
if err != nil {
return false, err
}
err = client.CoreV1().ConfigMaps(f.Namespace.Name).Delete(context.TODO(), cm.Name, metav1.DeleteOptions{})
framework.ExpectNoError(err, "Deleting successfully created configMap")
_, ok := created.Data["mutation-stage-1"]
return !ok, nil
})
framework.ExpectNoError(err, "Waiting for configMap in namespace %s this is not mutated", f.Namespace.Name)
ginkgo.By("Patching a mutating webhook configuration's rules to include the create operation")
hook, err = admissionClient.MutatingWebhookConfigurations().Patch(context.TODO(), f.UniqueName,
types.JSONPatchType,
[]byte(`[{"op": "replace", "path": "/webhooks/0/rules/0/operations", "value": ["CREATE"]}]`), metav1.PatchOptions{})
framework.ExpectNoError(err, "Patching mutating webhook configuration")
ginkgo.By("Creating a configMap that should be mutated")
err = wait.PollImmediate(100*time.Millisecond, 30*time.Second, func() (bool, error) {
cm := namedToBeMutatedConfigMap(string(uuid.NewUUID()), f)
created, err := client.CoreV1().ConfigMaps(f.Namespace.Name).Create(context.TODO(), cm, metav1.CreateOptions{})
if err != nil {
return false, err
}
err = client.CoreV1().ConfigMaps(f.Namespace.Name).Delete(context.TODO(), cm.Name, metav1.DeleteOptions{})
framework.ExpectNoError(err, "Deleting successfully created configMap")
_, ok := created.Data["mutation-stage-1"]
return ok, nil
})
framework.ExpectNoError(err, "Waiting for configMap in namespace %s to be mutated", f.Namespace.Name)
})
/*
Release: v1.16
Testname: Admission webhook, list validating webhooks
Description: Create 10 validating webhook configurations, all with a label. Attempt to list the webhook
configurations matching the label; all the created webhook configurations MUST be present. Attempt to create an
object; the create MUST be denied. Attempt to remove the webhook configurations matching the label with deletecollection;
all webhook configurations MUST be deleted. Attempt to create an object; the create MUST NOT be denied.
*/
framework.ConformanceIt("listing validating webhooks should work", func() {
testListSize := 10
testUUID := string(uuid.NewUUID())
for i := 0; i < testListSize; i++ {
name := fmt.Sprintf("%s-%d", f.UniqueName, i)
_, err := createValidatingWebhookConfiguration(f, &admissionregistrationv1.ValidatingWebhookConfiguration{
ObjectMeta: metav1.ObjectMeta{
Name: name,
Labels: map[string]string{"e2e-list-test-uuid": testUUID},
},
Webhooks: []admissionregistrationv1.ValidatingWebhook{
newDenyConfigMapWebhookFixture(f, certCtx, servicePort),
newValidatingIsReadyWebhookFixture(f, certCtx, servicePort),
},
})
framework.ExpectNoError(err, "Creating validating webhook configuration")
}
selectorListOpts := metav1.ListOptions{LabelSelector: "e2e-list-test-uuid=" + testUUID}
ginkgo.By("Listing all of the created validation webhooks")
list, err := client.AdmissionregistrationV1().ValidatingWebhookConfigurations().List(context.TODO(), selectorListOpts)
framework.ExpectNoError(err, "Listing validating webhook configurations")
framework.ExpectEqual(len(list.Items), testListSize)
// ensure backend is ready before proceeding
err = waitWebhookConfigurationReady(f)
framework.ExpectNoError(err, "waiting for webhook configuration to be ready")
ginkgo.By("Creating a configMap that does not comply to the validation webhook rules")
err = wait.PollImmediate(100*time.Millisecond, 30*time.Second, func() (bool, error) {
cm := namedNonCompliantConfigMap(string(uuid.NewUUID()), f)
_, err = client.CoreV1().ConfigMaps(f.Namespace.Name).Create(context.TODO(), cm, metav1.CreateOptions{})
if err == nil {
err = client.CoreV1().ConfigMaps(f.Namespace.Name).Delete(context.TODO(), cm.Name, metav1.DeleteOptions{})
framework.ExpectNoError(err, "Deleting successfully created configMap")
return false, nil
}
if !strings.Contains(err.Error(), "denied") {
return false, err
}
return true, nil
})
framework.ExpectNoError(err, "Waiting for configMap in namespace %s to be denied creation by validating webhook", f.Namespace.Name)
ginkgo.By("Deleting the collection of validation webhooks")
err = client.AdmissionregistrationV1().ValidatingWebhookConfigurations().DeleteCollection(context.TODO(), metav1.DeleteOptions{}, selectorListOpts)
framework.ExpectNoError(err, "Deleting collection of validating webhook configurations")
ginkgo.By("Creating a configMap that does not comply to the validation webhook rules")
err = wait.PollImmediate(100*time.Millisecond, 30*time.Second, func() (bool, error) {
cm := namedNonCompliantConfigMap(string(uuid.NewUUID()), f)
_, err = client.CoreV1().ConfigMaps(f.Namespace.Name).Create(context.TODO(), cm, metav1.CreateOptions{})
if err != nil {
if !strings.Contains(err.Error(), "denied") {
return false, err
}
return false, nil
}
err = client.CoreV1().ConfigMaps(f.Namespace.Name).Delete(context.TODO(), cm.Name, metav1.DeleteOptions{})
framework.ExpectNoError(err, "Deleting successfully created configMap")
return true, nil
})
framework.ExpectNoError(err, "Waiting for configMap in namespace %s to be allowed creation since there are no webhooks", f.Namespace.Name)
})
/*
Release: v1.16
Testname: Admission webhook, list mutating webhooks
Description: Create 10 mutating webhook configurations, all with a label. Attempt to list the webhook
configurations matching the label; all the created webhook configurations MUST be present. Attempt to create an
object; the object MUST be mutated. Attempt to remove the webhook configurations matching the label with deletecollection;
all webhook configurations MUST be deleted. Attempt to create an object; the object MUST NOT be mutated.
*/
framework.ConformanceIt("listing mutating webhooks should work", func() {
testListSize := 10
testUUID := string(uuid.NewUUID())
for i := 0; i < testListSize; i++ {
name := fmt.Sprintf("%s-%d", f.UniqueName, i)
_, err := createMutatingWebhookConfiguration(f, &admissionregistrationv1.MutatingWebhookConfiguration{
ObjectMeta: metav1.ObjectMeta{
Name: name,
Labels: map[string]string{"e2e-list-test-uuid": testUUID},
},
Webhooks: []admissionregistrationv1.MutatingWebhook{
newMutateConfigMapWebhookFixture(f, certCtx, 1, servicePort),
newMutatingIsReadyWebhookFixture(f, certCtx, servicePort),
},
})
framework.ExpectNoError(err, "Creating mutating webhook configuration")
}
selectorListOpts := metav1.ListOptions{LabelSelector: "e2e-list-test-uuid=" + testUUID}
ginkgo.By("Listing all of the created validation webhooks")
list, err := client.AdmissionregistrationV1().MutatingWebhookConfigurations().List(context.TODO(), selectorListOpts)
framework.ExpectNoError(err, "Listing mutating webhook configurations")
framework.ExpectEqual(len(list.Items), testListSize)
// ensure backend is ready before proceeding
err = waitWebhookConfigurationReady(f)
framework.ExpectNoError(err, "waiting for webhook configuration to be ready")
ginkgo.By("Creating a configMap that should be mutated")
err = wait.PollImmediate(100*time.Millisecond, 30*time.Second, func() (bool, error) {
cm := namedToBeMutatedConfigMap(string(uuid.NewUUID()), f)
created, err := client.CoreV1().ConfigMaps(f.Namespace.Name).Create(context.TODO(), cm, metav1.CreateOptions{})
if err != nil {
return false, err
}
err = client.CoreV1().ConfigMaps(f.Namespace.Name).Delete(context.TODO(), cm.Name, metav1.DeleteOptions{})
framework.ExpectNoError(err, "Deleting successfully created configMap")
_, ok := created.Data["mutation-stage-1"]
return ok, nil
})
framework.ExpectNoError(err, "Waiting for configMap in namespace %s to be mutated", f.Namespace.Name)
ginkgo.By("Deleting the collection of validation webhooks")
err = client.AdmissionregistrationV1().MutatingWebhookConfigurations().DeleteCollection(context.TODO(), metav1.DeleteOptions{}, selectorListOpts)
framework.ExpectNoError(err, "Deleting collection of mutating webhook configurations")
ginkgo.By("Creating a configMap that should not be mutated")
err = wait.PollImmediate(100*time.Millisecond, 30*time.Second, func() (bool, error) {
cm := namedToBeMutatedConfigMap(string(uuid.NewUUID()), f)
created, err := client.CoreV1().ConfigMaps(f.Namespace.Name).Create(context.TODO(), cm, metav1.CreateOptions{})
if err != nil {
return false, err
}
err = client.CoreV1().ConfigMaps(f.Namespace.Name).Delete(context.TODO(), cm.Name, metav1.DeleteOptions{})
framework.ExpectNoError(err, "Deleting successfully created configMap")
_, ok := created.Data["mutation-stage-1"]
return !ok, nil
})
framework.ExpectNoError(err, "Waiting for configMap in namespace %s this is not mutated", f.Namespace.Name)
})
})
func createAuthReaderRoleBinding(f *framework.Framework, namespace string) {
ginkgo.By("Create role binding to let webhook read extension-apiserver-authentication")
client := f.ClientSet
// Create the role binding to allow the webhook read the extension-apiserver-authentication configmap
_, err := client.RbacV1().RoleBindings("kube-system").Create(context.TODO(), &rbacv1.RoleBinding{
ObjectMeta: metav1.ObjectMeta{
Name: roleBindingName,
Annotations: map[string]string{
rbacv1.AutoUpdateAnnotationKey: "true",
},
},
RoleRef: rbacv1.RoleRef{
APIGroup: "",
Kind: "Role",
Name: "extension-apiserver-authentication-reader",
},
Subjects: []rbacv1.Subject{
{
Kind: "ServiceAccount",
Name: "default",
Namespace: namespace,
},
},
}, metav1.CreateOptions{})
if err != nil && apierrors.IsAlreadyExists(err) {
framework.Logf("role binding %s already exists", roleBindingName)
} else {
framework.ExpectNoError(err, "creating role binding %s:webhook to access configMap", namespace)
}
}
func deployWebhookAndService(f *framework.Framework, image string, certCtx *certContext, servicePort int32, containerPort int32) {
ginkgo.By("Deploying the webhook pod")
client := f.ClientSet
// Creating the secret that contains the webhook's cert.
secret := &v1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: secretName,
},
Type: v1.SecretTypeOpaque,
Data: map[string][]byte{
"tls.crt": certCtx.cert,
"tls.key": certCtx.key,
},
}
namespace := f.Namespace.Name
_, err := client.CoreV1().Secrets(namespace).Create(context.TODO(), secret, metav1.CreateOptions{})
framework.ExpectNoError(err, "creating secret %q in namespace %q", secretName, namespace)
// Create the deployment of the webhook
podLabels := map[string]string{"app": "sample-webhook", "webhook": "true"}
replicas := int32(1)
mounts := []v1.VolumeMount{
{
Name: "webhook-certs",
ReadOnly: true,
MountPath: "/webhook.local.config/certificates",
},
}
volumes := []v1.Volume{
{
Name: "webhook-certs",
VolumeSource: v1.VolumeSource{
Secret: &v1.SecretVolumeSource{SecretName: secretName},
},
},
}
containers := []v1.Container{
{
Name: "sample-webhook",
VolumeMounts: mounts,
Args: []string{
"webhook",
"--tls-cert-file=/webhook.local.config/certificates/tls.crt",
"--tls-private-key-file=/webhook.local.config/certificates/tls.key",
"--alsologtostderr",
"-v=4",
// Use a non-default port for containers.
fmt.Sprintf("--port=%d", containerPort),
},
ReadinessProbe: &v1.Probe{
ProbeHandler: v1.ProbeHandler{
HTTPGet: &v1.HTTPGetAction{
Scheme: v1.URISchemeHTTPS,
Port: intstr.FromInt(int(containerPort)),
Path: "/readyz",
},
},
PeriodSeconds: 1,
SuccessThreshold: 1,
FailureThreshold: 30,
},
Image: image,
Ports: []v1.ContainerPort{{ContainerPort: containerPort}},
},
}
d := e2edeployment.NewDeployment(deploymentName, replicas, podLabels, "", "", appsv1.RollingUpdateDeploymentStrategyType)
d.Spec.Template.Spec.Containers = containers
d.Spec.Template.Spec.Volumes = volumes
deployment, err := client.AppsV1().Deployments(namespace).Create(context.TODO(), d, metav1.CreateOptions{})
framework.ExpectNoError(err, "creating deployment %s in namespace %s", deploymentName, namespace)
ginkgo.By("Wait for the deployment to be ready")
err = e2edeployment.WaitForDeploymentRevisionAndImage(client, namespace, deploymentName, "1", image)
framework.ExpectNoError(err, "waiting for the deployment of image %s in %s in %s to complete", image, deploymentName, namespace)
err = e2edeployment.WaitForDeploymentComplete(client, deployment)
framework.ExpectNoError(err, "waiting for the deployment status valid", image, deploymentName, namespace)
ginkgo.By("Deploying the webhook service")
serviceLabels := map[string]string{"webhook": "true"}
service := &v1.Service{
ObjectMeta: metav1.ObjectMeta{
Namespace: namespace,
Name: serviceName,
Labels: map[string]string{"test": "webhook"},
},
Spec: v1.ServiceSpec{
Selector: serviceLabels,
Ports: []v1.ServicePort{
{
Protocol: v1.ProtocolTCP,
Port: servicePort,
TargetPort: intstr.FromInt(int(containerPort)),
},
},
},
}
_, err = client.CoreV1().Services(namespace).Create(context.TODO(), service, metav1.CreateOptions{})
framework.ExpectNoError(err, "creating service %s in namespace %s", serviceName, namespace)
ginkgo.By("Verifying the service has paired with the endpoint")
err = framework.WaitForServiceEndpointsNum(client, namespace, serviceName, 1, 1*time.Second, 30*time.Second)
framework.ExpectNoError(err, "waiting for service %s/%s have %d endpoint", namespace, serviceName, 1)
}
func strPtr(s string) *string { return &s }
func registerWebhook(f *framework.Framework, configName string, certCtx *certContext, servicePort int32) func() {
client := f.ClientSet
ginkgo.By("Registering the webhook via the AdmissionRegistration API")
namespace := f.Namespace.Name
// A webhook that cannot talk to server, with fail-open policy
failOpenHook := failingWebhook(namespace, "fail-open.k8s.io", servicePort)
policyIgnore := admissionregistrationv1.Ignore
failOpenHook.FailurePolicy = &policyIgnore
failOpenHook.NamespaceSelector = &metav1.LabelSelector{
MatchLabels: map[string]string{f.UniqueName: "true"},
}
_, err := createValidatingWebhookConfiguration(f, &admissionregistrationv1.ValidatingWebhookConfiguration{
ObjectMeta: metav1.ObjectMeta{
Name: configName,
},
Webhooks: []admissionregistrationv1.ValidatingWebhook{
newDenyPodWebhookFixture(f, certCtx, servicePort),
newDenyConfigMapWebhookFixture(f, certCtx, servicePort),
// Server cannot talk to this webhook, so it always fails.
// Because this webhook is configured fail-open, request should be admitted after the call fails.
failOpenHook,
// Register a webhook that can be probed by marker requests to detect when the configuration is ready.
newValidatingIsReadyWebhookFixture(f, certCtx, servicePort),
},
})
framework.ExpectNoError(err, "registering webhook config %s with namespace %s", configName, namespace)
err = waitWebhookConfigurationReady(f)
framework.ExpectNoError(err, "waiting for webhook configuration to be ready")
return func() {
client.AdmissionregistrationV1().ValidatingWebhookConfigurations().Delete(context.TODO(), configName, metav1.DeleteOptions{})
}
}
func registerWebhookForAttachingPod(f *framework.Framework, configName string, certCtx *certContext, servicePort int32) func() {
client := f.ClientSet
ginkgo.By("Registering the webhook via the AdmissionRegistration API")
namespace := f.Namespace.Name
sideEffectsNone := admissionregistrationv1.SideEffectClassNone
_, err := createValidatingWebhookConfiguration(f, &admissionregistrationv1.ValidatingWebhookConfiguration{
ObjectMeta: metav1.ObjectMeta{
Name: configName,
},
Webhooks: []admissionregistrationv1.ValidatingWebhook{
{
Name: "deny-attaching-pod.k8s.io",
Rules: []admissionregistrationv1.RuleWithOperations{{
Operations: []admissionregistrationv1.OperationType{admissionregistrationv1.Connect},
Rule: admissionregistrationv1.Rule{
APIGroups: []string{""},
APIVersions: []string{"v1"},
Resources: []string{"pods/attach"},
},
}},
ClientConfig: admissionregistrationv1.WebhookClientConfig{
Service: &admissionregistrationv1.ServiceReference{
Namespace: namespace,
Name: serviceName,
Path: strPtr("/pods/attach"),
Port: pointer.Int32Ptr(servicePort),
},
CABundle: certCtx.signingCert,
},
SideEffects: &sideEffectsNone,
AdmissionReviewVersions: []string{"v1", "v1beta1"},
// Scope the webhook to just this namespace
NamespaceSelector: &metav1.LabelSelector{
MatchLabels: map[string]string{f.UniqueName: "true"},
},
},
// Register a webhook that can be probed by marker requests to detect when the configuration is ready.
newValidatingIsReadyWebhookFixture(f, certCtx, servicePort),
},
})
framework.ExpectNoError(err, "registering webhook config %s with namespace %s", configName, namespace)
err = waitWebhookConfigurationReady(f)
framework.ExpectNoError(err, "waiting for webhook configuration to be ready")
return func() {
client.AdmissionregistrationV1().ValidatingWebhookConfigurations().Delete(context.TODO(), configName, metav1.DeleteOptions{})
}
}
func registerMutatingWebhookForConfigMap(f *framework.Framework, configName string, certCtx *certContext, servicePort int32) func() {
client := f.ClientSet
ginkgo.By("Registering the mutating configmap webhook via the AdmissionRegistration API")
namespace := f.Namespace.Name
_, err := createMutatingWebhookConfiguration(f, &admissionregistrationv1.MutatingWebhookConfiguration{
ObjectMeta: metav1.ObjectMeta{
Name: configName,
},
Webhooks: []admissionregistrationv1.MutatingWebhook{
newMutateConfigMapWebhookFixture(f, certCtx, 1, servicePort),
newMutateConfigMapWebhookFixture(f, certCtx, 2, servicePort),
// Register a webhook that can be probed by marker requests to detect when the configuration is ready.
newMutatingIsReadyWebhookFixture(f, certCtx, servicePort),
},
})
framework.ExpectNoError(err, "registering mutating webhook config %s with namespace %s", configName, namespace)
err = waitWebhookConfigurationReady(f)
framework.ExpectNoError(err, "waiting for webhook configuration to be ready")
return func() {
client.AdmissionregistrationV1().MutatingWebhookConfigurations().Delete(context.TODO(), configName, metav1.DeleteOptions{})
}
}
func testMutatingConfigMapWebhook(f *framework.Framework) {
ginkgo.By("create a configmap that should be updated by the webhook")
client := f.ClientSet
configMap := toBeMutatedConfigMap(f)
mutatedConfigMap, err := client.CoreV1().ConfigMaps(f.Namespace.Name).Create(context.TODO(), configMap, metav1.CreateOptions{})
framework.ExpectNoError(err)
expectedConfigMapData := map[string]string{
"mutation-start": "yes",
"mutation-stage-1": "yes",
"mutation-stage-2": "yes",
}
if !reflect.DeepEqual(expectedConfigMapData, mutatedConfigMap.Data) {
framework.Failf("\nexpected %#v\n, got %#v\n", expectedConfigMapData, mutatedConfigMap.Data)
}
}
func registerMutatingWebhookForPod(f *framework.Framework, configName string, certCtx *certContext, servicePort int32) func() {
client := f.ClientSet
ginkgo.By("Registering the mutating pod webhook via the AdmissionRegistration API")
namespace := f.Namespace.Name
sideEffectsNone := admissionregistrationv1.SideEffectClassNone
_, err := createMutatingWebhookConfiguration(f, &admissionregistrationv1.MutatingWebhookConfiguration{
ObjectMeta: metav1.ObjectMeta{
Name: configName,
},