mirror of
https://github.com/k3s-io/kubernetes.git
synced 2025-10-31 22:01:06 +00:00
449 lines
17 KiB
Go
449 lines
17 KiB
Go
/*
|
|
Copyright 2018 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 master
|
|
|
|
import (
|
|
"context"
|
|
"encoding/json"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"net/http"
|
|
"os"
|
|
"strings"
|
|
"testing"
|
|
"time"
|
|
|
|
"k8s.io/api/admission/v1beta1"
|
|
admissionv1beta1 "k8s.io/api/admissionregistration/v1beta1"
|
|
apiv1 "k8s.io/api/core/v1"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
|
|
"k8s.io/apimachinery/pkg/runtime/schema"
|
|
"k8s.io/apimachinery/pkg/types"
|
|
"k8s.io/apimachinery/pkg/util/wait"
|
|
"k8s.io/apiserver/pkg/admission/plugin/webhook/mutating"
|
|
auditinternal "k8s.io/apiserver/pkg/apis/audit"
|
|
auditv1 "k8s.io/apiserver/pkg/apis/audit/v1"
|
|
auditv1beta1 "k8s.io/apiserver/pkg/apis/audit/v1beta1"
|
|
"k8s.io/client-go/kubernetes"
|
|
clientset "k8s.io/client-go/kubernetes"
|
|
kubeapiservertesting "k8s.io/kubernetes/cmd/kube-apiserver/app/testing"
|
|
"k8s.io/kubernetes/test/integration/framework"
|
|
"k8s.io/kubernetes/test/utils"
|
|
|
|
jsonpatch "github.com/evanphx/json-patch"
|
|
)
|
|
|
|
const (
|
|
testWebhookConfigurationName = "auditmutation.integration.test"
|
|
testWebhookName = "auditmutation.integration.test"
|
|
)
|
|
|
|
var (
|
|
auditPolicyPattern = `
|
|
apiVersion: {version}
|
|
kind: Policy
|
|
rules:
|
|
- level: {level}
|
|
resources:
|
|
- group: "" # core
|
|
resources: ["configmaps"]
|
|
|
|
`
|
|
namespace = "default"
|
|
watchTestTimeout int64 = 1
|
|
watchOptions = metav1.ListOptions{TimeoutSeconds: &watchTestTimeout}
|
|
patch, _ = json.Marshal(jsonpatch.Patch{})
|
|
auditTestUser = "system:apiserver"
|
|
versions = map[string]schema.GroupVersion{
|
|
"audit.k8s.io/v1": auditv1.SchemeGroupVersion,
|
|
"audit.k8s.io/v1beta1": auditv1beta1.SchemeGroupVersion,
|
|
}
|
|
|
|
expectedEvents = []utils.AuditEvent{
|
|
{
|
|
Level: auditinternal.LevelRequestResponse,
|
|
Stage: auditinternal.StageResponseComplete,
|
|
RequestURI: fmt.Sprintf("/api/v1/namespaces/%s/configmaps", namespace),
|
|
Verb: "create",
|
|
Code: 201,
|
|
User: auditTestUser,
|
|
Resource: "configmaps",
|
|
Namespace: namespace,
|
|
RequestObject: true,
|
|
ResponseObject: true,
|
|
AuthorizeDecision: "allow",
|
|
}, {
|
|
Level: auditinternal.LevelRequestResponse,
|
|
Stage: auditinternal.StageResponseComplete,
|
|
RequestURI: fmt.Sprintf("/api/v1/namespaces/%s/configmaps/audit-configmap", namespace),
|
|
Verb: "get",
|
|
Code: 200,
|
|
User: auditTestUser,
|
|
Resource: "configmaps",
|
|
Namespace: namespace,
|
|
RequestObject: false,
|
|
ResponseObject: true,
|
|
AuthorizeDecision: "allow",
|
|
}, {
|
|
Level: auditinternal.LevelRequestResponse,
|
|
Stage: auditinternal.StageResponseComplete,
|
|
RequestURI: fmt.Sprintf("/api/v1/namespaces/%s/configmaps", namespace),
|
|
Verb: "list",
|
|
Code: 200,
|
|
User: auditTestUser,
|
|
Resource: "configmaps",
|
|
Namespace: namespace,
|
|
RequestObject: false,
|
|
ResponseObject: true,
|
|
AuthorizeDecision: "allow",
|
|
}, {
|
|
Level: auditinternal.LevelRequestResponse,
|
|
Stage: auditinternal.StageResponseStarted,
|
|
RequestURI: fmt.Sprintf("/api/v1/namespaces/%s/configmaps?timeout=%ds&timeoutSeconds=%d&watch=true", namespace, watchTestTimeout, watchTestTimeout),
|
|
Verb: "watch",
|
|
Code: 200,
|
|
User: auditTestUser,
|
|
Resource: "configmaps",
|
|
Namespace: namespace,
|
|
RequestObject: false,
|
|
ResponseObject: false,
|
|
AuthorizeDecision: "allow",
|
|
}, {
|
|
Level: auditinternal.LevelRequestResponse,
|
|
Stage: auditinternal.StageResponseComplete,
|
|
RequestURI: fmt.Sprintf("/api/v1/namespaces/%s/configmaps?timeout=%ds&timeoutSeconds=%d&watch=true", namespace, watchTestTimeout, watchTestTimeout),
|
|
Verb: "watch",
|
|
Code: 200,
|
|
User: auditTestUser,
|
|
Resource: "configmaps",
|
|
Namespace: namespace,
|
|
RequestObject: false,
|
|
ResponseObject: false,
|
|
AuthorizeDecision: "allow",
|
|
}, {
|
|
Level: auditinternal.LevelRequestResponse,
|
|
Stage: auditinternal.StageResponseComplete,
|
|
RequestURI: fmt.Sprintf("/api/v1/namespaces/%s/configmaps/audit-configmap", namespace),
|
|
Verb: "update",
|
|
Code: 200,
|
|
User: auditTestUser,
|
|
Resource: "configmaps",
|
|
Namespace: namespace,
|
|
RequestObject: true,
|
|
ResponseObject: true,
|
|
AuthorizeDecision: "allow",
|
|
}, {
|
|
Level: auditinternal.LevelRequestResponse,
|
|
Stage: auditinternal.StageResponseComplete,
|
|
RequestURI: fmt.Sprintf("/api/v1/namespaces/%s/configmaps/audit-configmap", namespace),
|
|
Verb: "patch",
|
|
Code: 200,
|
|
User: auditTestUser,
|
|
Resource: "configmaps",
|
|
Namespace: namespace,
|
|
RequestObject: true,
|
|
ResponseObject: true,
|
|
AuthorizeDecision: "allow",
|
|
}, {
|
|
Level: auditinternal.LevelRequestResponse,
|
|
Stage: auditinternal.StageResponseComplete,
|
|
RequestURI: fmt.Sprintf("/api/v1/namespaces/%s/configmaps/audit-configmap", namespace),
|
|
Verb: "delete",
|
|
Code: 200,
|
|
User: auditTestUser,
|
|
Resource: "configmaps",
|
|
Namespace: namespace,
|
|
RequestObject: true,
|
|
ResponseObject: true,
|
|
AuthorizeDecision: "allow",
|
|
},
|
|
}
|
|
)
|
|
|
|
// TestAudit ensures that both v1beta1 and v1 version audit api could work.
|
|
func TestAudit(t *testing.T) {
|
|
tcs := []struct {
|
|
auditLevel auditinternal.Level
|
|
enableMutatingWebhook bool
|
|
}{
|
|
{
|
|
auditLevel: auditinternal.LevelRequestResponse,
|
|
enableMutatingWebhook: false,
|
|
},
|
|
{
|
|
auditLevel: auditinternal.LevelMetadata,
|
|
enableMutatingWebhook: true,
|
|
},
|
|
{
|
|
auditLevel: auditinternal.LevelRequest,
|
|
enableMutatingWebhook: true,
|
|
},
|
|
{
|
|
auditLevel: auditinternal.LevelRequestResponse,
|
|
enableMutatingWebhook: true,
|
|
},
|
|
}
|
|
for version := range versions {
|
|
for _, tc := range tcs {
|
|
t.Run(fmt.Sprintf("%s.%s.%t", version, tc.auditLevel, tc.enableMutatingWebhook), func(t *testing.T) {
|
|
testAudit(t, version, tc.auditLevel, tc.enableMutatingWebhook)
|
|
})
|
|
}
|
|
}
|
|
}
|
|
|
|
func testAudit(t *testing.T, version string, level auditinternal.Level, enableMutatingWebhook bool) {
|
|
var url string
|
|
var err error
|
|
closeFunc := func() {}
|
|
if enableMutatingWebhook {
|
|
webhookMux := http.NewServeMux()
|
|
webhookMux.Handle("/mutation", utils.AdmissionWebhookHandler(t, admitFunc))
|
|
url, closeFunc, err = utils.NewAdmissionWebhookServer(webhookMux)
|
|
}
|
|
defer closeFunc()
|
|
if err != nil {
|
|
t.Fatalf("%v", err)
|
|
}
|
|
|
|
// prepare audit policy file
|
|
auditPolicy := strings.Replace(auditPolicyPattern, "{version}", version, 1)
|
|
auditPolicy = strings.Replace(auditPolicy, "{level}", string(level), 1)
|
|
policyFile, err := ioutil.TempFile("", "audit-policy.yaml")
|
|
if err != nil {
|
|
t.Fatalf("Failed to create audit policy file: %v", err)
|
|
}
|
|
defer os.Remove(policyFile.Name())
|
|
if _, err := policyFile.Write([]byte(auditPolicy)); err != nil {
|
|
t.Fatalf("Failed to write audit policy file: %v", err)
|
|
}
|
|
if err := policyFile.Close(); err != nil {
|
|
t.Fatalf("Failed to close audit policy file: %v", err)
|
|
}
|
|
|
|
// prepare audit log file
|
|
logFile, err := ioutil.TempFile("", "audit.log")
|
|
if err != nil {
|
|
t.Fatalf("Failed to create audit log file: %v", err)
|
|
}
|
|
defer os.Remove(logFile.Name())
|
|
|
|
// start api server
|
|
result := kubeapiservertesting.StartTestServerOrDie(t, nil,
|
|
[]string{
|
|
"--audit-policy-file", policyFile.Name(),
|
|
"--audit-log-version", version,
|
|
"--audit-log-mode", "blocking",
|
|
"--audit-log-path", logFile.Name()},
|
|
framework.SharedEtcd())
|
|
defer result.TearDownFn()
|
|
|
|
kubeclient, err := kubernetes.NewForConfig(result.ClientConfig)
|
|
if err != nil {
|
|
t.Fatalf("Unexpected error: %v", err)
|
|
}
|
|
|
|
if enableMutatingWebhook {
|
|
if err := createV1beta1MutationWebhook(kubeclient, url+"/mutation"); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
}
|
|
|
|
var lastMissingReport string
|
|
if err := wait.Poll(500*time.Millisecond, wait.ForeverTestTimeout, func() (bool, error) {
|
|
// perform configmap operations
|
|
configMapOperations(t, kubeclient)
|
|
|
|
// check for corresponding audit logs
|
|
stream, err := os.Open(logFile.Name())
|
|
if err != nil {
|
|
return false, fmt.Errorf("unexpected error: %v", err)
|
|
}
|
|
defer stream.Close()
|
|
missingReport, err := utils.CheckAuditLines(stream, getExpectedEvents(level, enableMutatingWebhook), versions[version])
|
|
if err != nil {
|
|
return false, fmt.Errorf("unexpected error: %v", err)
|
|
}
|
|
if len(missingReport.MissingEvents) > 0 {
|
|
lastMissingReport = missingReport.String()
|
|
return false, nil
|
|
}
|
|
return true, nil
|
|
}); err != nil {
|
|
t.Fatalf("failed to get expected events -- missingReport: %s, error: %v", lastMissingReport, err)
|
|
}
|
|
}
|
|
|
|
func getExpectedEvents(level auditinternal.Level, enableMutatingWebhook bool) []utils.AuditEvent {
|
|
if !enableMutatingWebhook {
|
|
return expectedEvents
|
|
}
|
|
|
|
var webhookMutationAnnotations, webhookPatchAnnotations map[string]string
|
|
var requestObject, responseObject bool
|
|
if level.GreaterOrEqual(auditinternal.LevelMetadata) {
|
|
// expect mutation existence annotation
|
|
webhookMutationAnnotations = map[string]string{}
|
|
webhookMutationAnnotations[mutating.MutationAuditAnnotationPrefix+"round_0_index_0"] = fmt.Sprintf(`{"configuration":"%s","webhook":"%s","mutated":%t}`, testWebhookConfigurationName, testWebhookName, true)
|
|
}
|
|
if level.GreaterOrEqual(auditinternal.LevelRequest) {
|
|
// expect actual patch annotation
|
|
webhookPatchAnnotations = map[string]string{}
|
|
webhookPatchAnnotations[mutating.PatchAuditAnnotationPrefix+"round_0_index_0"] = strings.Replace(fmt.Sprintf(`{"configuration": "%s", "webhook": "%s", "patch": %s, "patchType": "JSONPatch"}`, testWebhookConfigurationName, testWebhookName, `[{"op":"add","path":"/data","value":{"test":"dummy"}}]`), " ", "", -1)
|
|
// expect request object in audit log
|
|
requestObject = true
|
|
}
|
|
if level.GreaterOrEqual(auditinternal.LevelRequestResponse) {
|
|
// expect response obect in audit log
|
|
responseObject = true
|
|
}
|
|
return []utils.AuditEvent{
|
|
{
|
|
// expect CREATE audit event with webhook in effect
|
|
Level: level,
|
|
Stage: auditinternal.StageResponseComplete,
|
|
RequestURI: fmt.Sprintf("/api/v1/namespaces/%s/configmaps", namespace),
|
|
Verb: "create",
|
|
Code: 201,
|
|
User: auditTestUser,
|
|
Resource: "configmaps",
|
|
Namespace: namespace,
|
|
AuthorizeDecision: "allow",
|
|
RequestObject: requestObject,
|
|
ResponseObject: responseObject,
|
|
AdmissionWebhookMutationAnnotations: webhookMutationAnnotations,
|
|
AdmissionWebhookPatchAnnotations: webhookPatchAnnotations,
|
|
}, {
|
|
// expect UPDATE audit event with webhook in effect
|
|
Level: level,
|
|
Stage: auditinternal.StageResponseComplete,
|
|
RequestURI: fmt.Sprintf("/api/v1/namespaces/%s/configmaps/audit-configmap", namespace),
|
|
Verb: "update",
|
|
Code: 200,
|
|
User: auditTestUser,
|
|
Resource: "configmaps",
|
|
Namespace: namespace,
|
|
AuthorizeDecision: "allow",
|
|
RequestObject: requestObject,
|
|
ResponseObject: responseObject,
|
|
AdmissionWebhookMutationAnnotations: webhookMutationAnnotations,
|
|
AdmissionWebhookPatchAnnotations: webhookPatchAnnotations,
|
|
},
|
|
}
|
|
}
|
|
|
|
// configMapOperations is a set of known operations performed on the configmap type
|
|
// which correspond to the expected events.
|
|
// This is shared by the dynamic test
|
|
func configMapOperations(t *testing.T, kubeclient kubernetes.Interface) {
|
|
// create, get, watch, update, patch, list and delete configmap.
|
|
configMap := &apiv1.ConfigMap{
|
|
ObjectMeta: metav1.ObjectMeta{
|
|
Name: "audit-configmap",
|
|
},
|
|
Data: map[string]string{
|
|
"map-key": "map-value",
|
|
},
|
|
}
|
|
|
|
_, err := kubeclient.CoreV1().ConfigMaps(namespace).Create(context.TODO(), configMap, metav1.CreateOptions{})
|
|
expectNoError(t, err, "failed to create audit-configmap")
|
|
|
|
_, err = kubeclient.CoreV1().ConfigMaps(namespace).Get(context.TODO(), configMap.Name, metav1.GetOptions{})
|
|
expectNoError(t, err, "failed to get audit-configmap")
|
|
|
|
configMapChan, err := kubeclient.CoreV1().ConfigMaps(namespace).Watch(context.TODO(), watchOptions)
|
|
expectNoError(t, err, "failed to create watch for config maps")
|
|
for range configMapChan.ResultChan() {
|
|
// Block until watchOptions.TimeoutSeconds expires.
|
|
// If the test finishes before watchOptions.TimeoutSeconds expires, the watch audit
|
|
// event at stage ResponseComplete will not be generated.
|
|
}
|
|
|
|
_, err = kubeclient.CoreV1().ConfigMaps(namespace).Update(context.TODO(), configMap, metav1.UpdateOptions{})
|
|
expectNoError(t, err, "failed to update audit-configmap")
|
|
|
|
_, err = kubeclient.CoreV1().ConfigMaps(namespace).Patch(context.TODO(), configMap.Name, types.JSONPatchType, patch, metav1.PatchOptions{})
|
|
expectNoError(t, err, "failed to patch configmap")
|
|
|
|
_, err = kubeclient.CoreV1().ConfigMaps(namespace).List(context.TODO(), metav1.ListOptions{})
|
|
expectNoError(t, err, "failed to list config maps")
|
|
|
|
err = kubeclient.CoreV1().ConfigMaps(namespace).Delete(context.TODO(), configMap.Name, metav1.DeleteOptions{})
|
|
expectNoError(t, err, "failed to delete audit-configmap")
|
|
}
|
|
|
|
func expectNoError(t *testing.T, err error, msg string) {
|
|
if err != nil {
|
|
t.Fatalf("%s: %v", msg, err)
|
|
}
|
|
}
|
|
|
|
func admitFunc(review *v1beta1.AdmissionReview) error {
|
|
gvk := schema.GroupVersionKind{Group: "admission.k8s.io", Version: "v1beta1", Kind: "AdmissionReview"}
|
|
if review.GetObjectKind().GroupVersionKind() != gvk {
|
|
return fmt.Errorf("invalid admission review kind: %#v", review.GetObjectKind().GroupVersionKind())
|
|
}
|
|
if len(review.Request.Object.Raw) > 0 {
|
|
u := &unstructured.Unstructured{Object: map[string]interface{}{}}
|
|
if err := json.Unmarshal(review.Request.Object.Raw, u); err != nil {
|
|
return fmt.Errorf("failed to deserialize object: %s with error: %v", string(review.Request.Object.Raw), err)
|
|
}
|
|
review.Request.Object.Object = u
|
|
}
|
|
if len(review.Request.OldObject.Raw) > 0 {
|
|
u := &unstructured.Unstructured{Object: map[string]interface{}{}}
|
|
if err := json.Unmarshal(review.Request.OldObject.Raw, u); err != nil {
|
|
return fmt.Errorf("failed to deserialize object: %s with error: %v", string(review.Request.OldObject.Raw), err)
|
|
}
|
|
review.Request.OldObject.Object = u
|
|
}
|
|
|
|
review.Response = &v1beta1.AdmissionResponse{
|
|
Allowed: true,
|
|
UID: review.Request.UID,
|
|
Result: &metav1.Status{Message: "admitted"},
|
|
}
|
|
review.Response.Patch = []byte(`[{"op":"add","path":"/data","value":{"test":"dummy"}}]`)
|
|
jsonPatch := v1beta1.PatchTypeJSONPatch
|
|
review.Response.PatchType = &jsonPatch
|
|
return nil
|
|
}
|
|
|
|
func createV1beta1MutationWebhook(client clientset.Interface, endpoint string) error {
|
|
fail := admissionv1beta1.Fail
|
|
// Attaching Mutation webhook to API server
|
|
_, err := client.AdmissionregistrationV1beta1().MutatingWebhookConfigurations().Create(context.TODO(), &admissionv1beta1.MutatingWebhookConfiguration{
|
|
ObjectMeta: metav1.ObjectMeta{Name: testWebhookConfigurationName},
|
|
Webhooks: []admissionv1beta1.MutatingWebhook{{
|
|
Name: testWebhookName,
|
|
ClientConfig: admissionv1beta1.WebhookClientConfig{
|
|
URL: &endpoint,
|
|
CABundle: utils.LocalhostCert,
|
|
},
|
|
Rules: []admissionv1beta1.RuleWithOperations{{
|
|
Operations: []admissionv1beta1.OperationType{admissionv1beta1.Create, admissionv1beta1.Update},
|
|
Rule: admissionv1beta1.Rule{APIGroups: []string{"*"}, APIVersions: []string{"*"}, Resources: []string{"*/*"}},
|
|
}},
|
|
FailurePolicy: &fail,
|
|
AdmissionReviewVersions: []string{"v1beta1"},
|
|
}},
|
|
}, metav1.CreateOptions{})
|
|
return err
|
|
}
|