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admission_test.go
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admission_test.go
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// Copyright (c) 2021 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 auditpolicy_test
import (
"context"
"fmt"
"net/http"
"sigs.k8s.io/controller-runtime/pkg/cache"
fakeclient "sigs.k8s.io/controller-runtime/pkg/client/fake"
"github.com/gardener/gardener/pkg/admissioncontroller/webhooks/admission/auditpolicy"
gardencorev1alpha1 "github.com/gardener/gardener/pkg/apis/core/v1alpha1"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
"github.com/gardener/gardener/pkg/client/kubernetes"
mockclient "github.com/gardener/gardener/pkg/mock/controller-runtime/client"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/go-logr/logr"
"github.com/golang/mock/gomock"
. "github.com/onsi/ginkgo/v2"
. "github.com/onsi/gomega"
admissionv1 "k8s.io/api/admission/v1"
v1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
jsonserializer "k8s.io/apimachinery/pkg/runtime/serializer/json"
"k8s.io/utils/pointer"
"sigs.k8s.io/controller-runtime/pkg/client"
logzap "sigs.k8s.io/controller-runtime/pkg/log/zap"
"sigs.k8s.io/controller-runtime/pkg/runtime/inject"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
)
var _ = Describe("handler", func() {
var (
ctx = context.TODO()
logger logr.Logger
request admission.Request
decoder *admission.Decoder
handler admission.Handler
ctrl *gomock.Controller
mockReader *mockclient.MockReader
fakeClient client.Client
statusCodeAllowed int32 = http.StatusOK
statusCodeInvalid int32 = http.StatusUnprocessableEntity
statusCodeInternalError int32 = http.StatusInternalServerError
testEncoder runtime.Encoder
cmName = "fake-cm-name"
cmNameOther = "fake-cm-name-other"
cmNamespace = "fake-cm-namespace"
shootName = "fake-shoot-name"
shootNamespace = cmNamespace
cm *v1.ConfigMap
shootv1beta1 *gardencorev1beta1.Shoot
shootv1alpha1 *gardencorev1alpha1.Shoot
validAuditPolicy = `
---
apiVersion: audit.k8s.io/v1
kind: Policy
rules:
- level: RequestResponse
resources:
- group: ""
resources: ["pods"]
- level: Metadata
resources:
- group: ""
resources: ["pods/log", "pods/status"]
`
anotherValidAuditPolicy = `
---
apiVersion: audit.k8s.io/v1
kind: Policy
rules:
- level: RequestResponse
resources:
- group: ""
resources: ["pods"]
- level: Metadata
resources:
- group: ""
resources: ["pods/log"]
`
missingKeyAuditPolicy = `
---
apiVersion: audit.k8s.io/v1
kind: Policy
rules:
- level: RequestResponse
resources:
- group: "
resources: ["pods"]
`
invalidAuditPolicy = `
---
apiVersion: audit.k8s.io/v1
kind: Policy
rules:
- level: FakeLevel
resources:
- group: ""
resources: ["pods"]
- level: Metadata
resources:
- group: ""
resources: ["pods/log", "pods/status"]
`
)
BeforeEach(func() {
logger = logzap.New(logzap.WriteTo(GinkgoWriter))
testEncoder = &jsonserializer.Serializer{}
ctrl = gomock.NewController(GinkgoT())
mockReader = mockclient.NewMockReader(ctrl)
fakeClient = fakeclient.NewClientBuilder().WithScheme(kubernetes.GardenScheme).Build()
var err error
decoder, err = admission.NewDecoder(kubernetes.GardenScheme)
Expect(err).NotTo(HaveOccurred())
handler = auditpolicy.New(logger)
Expect(inject.APIReaderInto(mockReader, handler)).To(BeTrue())
Expect(admission.InjectDecoderInto(decoder, handler)).To(BeTrue())
request = admission.Request{}
shootv1beta1 = &gardencorev1beta1.Shoot{
TypeMeta: metav1.TypeMeta{
APIVersion: gardencorev1beta1.SchemeGroupVersion.String(),
Kind: "Shoot",
},
ObjectMeta: metav1.ObjectMeta{
Name: shootName,
Namespace: shootNamespace,
},
Spec: gardencorev1beta1.ShootSpec{
Kubernetes: gardencorev1beta1.Kubernetes{
KubeAPIServer: &gardencorev1beta1.KubeAPIServerConfig{
AuditConfig: &gardencorev1beta1.AuditConfig{
AuditPolicy: &gardencorev1beta1.AuditPolicy{
ConfigMapRef: &v1.ObjectReference{
Name: cmName,
},
},
},
},
},
},
}
shootv1alpha1 = &gardencorev1alpha1.Shoot{
TypeMeta: metav1.TypeMeta{
APIVersion: gardencorev1alpha1.SchemeGroupVersion.String(),
Kind: "Shoot",
},
ObjectMeta: metav1.ObjectMeta{
Name: shootName,
Namespace: shootNamespace,
},
Spec: gardencorev1alpha1.ShootSpec{
Kubernetes: gardencorev1alpha1.Kubernetes{
KubeAPIServer: &gardencorev1alpha1.KubeAPIServerConfig{
AuditConfig: &gardencorev1alpha1.AuditConfig{
AuditPolicy: &gardencorev1alpha1.AuditPolicy{
ConfigMapRef: &v1.ObjectReference{
Name: cmName,
},
},
},
},
},
},
}
})
AfterEach(func() {
ctrl.Finish()
})
test := func(op admissionv1.Operation, oldObj runtime.Object, obj runtime.Object, expectedAllowed bool, expectedStatusCode int32, expectedMsg string, expectedReason string) {
request.Operation = op
if oldObj != nil {
objData, err := runtime.Encode(testEncoder, oldObj)
Expect(err).NotTo(HaveOccurred())
request.OldObject.Raw = objData
}
if obj != nil {
objData, err := runtime.Encode(testEncoder, obj)
Expect(err).NotTo(HaveOccurred())
request.Object.Raw = objData
}
response := handler.Handle(ctx, request)
Expect(response).To(Not(BeNil()))
Expect(response.Allowed).To(Equal(expectedAllowed))
Expect(response.Result.Code).To(Equal(expectedStatusCode))
if expectedMsg != "" {
Expect(response.Result.Message).To(ContainSubstring(expectedMsg))
}
if expectedReason != "" {
Expect(string(response.Result.Reason)).To(ContainSubstring(expectedReason))
}
Expect(response.Patches).To(BeEmpty())
}
Context("Shoots", func() {
BeforeEach(func() {
request.Kind = metav1.GroupVersionKind{Group: "core.gardener.cloud", Version: "v1beta1", Kind: "Shoot"}
})
It("should ignore subresources", func() {
newShoot := shootv1beta1.DeepCopy()
newShoot.Status.SeedName = pointer.String("foo")
request.SubResource = "status"
test(admissionv1.Update, shootv1beta1, nil, true, statusCodeAllowed, "subresource", "")
})
It("should ignore other operations than CREATE or UPDATE", func() {
test(admissionv1.Delete, shootv1beta1, nil, true, statusCodeAllowed, "operation is not Create or Update", "")
test(admissionv1.Connect, shootv1beta1, nil, true, statusCodeAllowed, "operation is not Create or Update", "")
})
Context("Allow", func() {
It("has no KubeAPIServer config", func() {
shootv1beta1.Spec.Kubernetes.KubeAPIServer = nil
test(admissionv1.Create, nil, shootv1beta1, true, statusCodeAllowed, "shoot resource is not specifying any audit policy", "")
})
It("has no AuditConfig", func() {
shootv1beta1.Spec.Kubernetes.KubeAPIServer.AuditConfig = nil
test(admissionv1.Create, nil, shootv1beta1, true, statusCodeAllowed, "shoot resource is not specifying any audit policy", "")
})
It("has no audit policy cm Ref", func() {
shootv1beta1.Spec.Kubernetes.KubeAPIServer.AuditConfig.AuditPolicy.ConfigMapRef = nil
test(admissionv1.Create, nil, shootv1beta1, true, statusCodeAllowed, "shoot resource is not specifying any audit policy", "")
})
It("references a valid auditPolicy (CREATE)", func() {
returnedCm := v1.ConfigMap{
TypeMeta: metav1.TypeMeta{},
ObjectMeta: metav1.ObjectMeta{ResourceVersion: "1"},
Data: map[string]string{"policy": validAuditPolicy},
}
mockReader.EXPECT().Get(gomock.Any(), kutil.Key(shootNamespace, cmName), gomock.AssignableToTypeOf(&v1.ConfigMap{})).DoAndReturn(func(_ context.Context, key client.ObjectKey, cm *v1.ConfigMap) error {
*cm = returnedCm
return nil
})
test(admissionv1.Create, nil, shootv1beta1, true, statusCodeAllowed, "referenced audit policy is valid", "")
})
It("references a valid auditPolicy (CREATE/v1alpha1)", func() {
returnedCm := v1.ConfigMap{
TypeMeta: metav1.TypeMeta{},
ObjectMeta: metav1.ObjectMeta{ResourceVersion: "1"},
Data: map[string]string{"policy": validAuditPolicy},
}
mockReader.EXPECT().Get(gomock.Any(), kutil.Key(shootNamespace, cmName), gomock.AssignableToTypeOf(&v1.ConfigMap{})).DoAndReturn(func(_ context.Context, key client.ObjectKey, cm *v1.ConfigMap) error {
*cm = returnedCm
return nil
})
test(admissionv1.Create, nil, shootv1alpha1, true, statusCodeAllowed, "referenced audit policy is valid", "")
})
It("referenced auditPolicy name was not changed (UPDATE)", func() {
newShoot := shootv1beta1.DeepCopy()
newShoot.Spec.Kubernetes.Version = "upgrade"
test(admissionv1.Update, shootv1beta1, newShoot, true, statusCodeAllowed, "audit policy configmap was not changed", "")
})
It("referenced auditPolicy name was not changed (UPDATE/v1alpha1)", func() {
newShoot := shootv1alpha1.DeepCopy()
newShoot.Spec.Kubernetes.Version = "upgrade"
test(admissionv1.Update, shootv1alpha1, newShoot, true, statusCodeAllowed, "audit policy configmap was not changed", "")
})
It("auditPolicy name was added (UPDATE)", func() {
returnedCm := v1.ConfigMap{
Data: map[string]string{"policy": validAuditPolicy},
}
apiServerConfig := shootv1beta1.Spec.Kubernetes.KubeAPIServer.DeepCopy()
shootv1beta1.Spec.Kubernetes.KubeAPIServer = nil
newShoot := shootv1beta1.DeepCopy()
newShoot.Spec.Kubernetes.KubeAPIServer = apiServerConfig
mockReader.EXPECT().Get(gomock.Any(), kutil.Key(shootNamespace, cmName), gomock.AssignableToTypeOf(&v1.ConfigMap{})).DoAndReturn(func(_ context.Context, key client.ObjectKey, cm *v1.ConfigMap) error {
*cm = returnedCm
return nil
})
test(admissionv1.Update, shootv1beta1, newShoot, true, statusCodeAllowed, "referenced audit policy is valid", "")
})
It("auditPolicy name was added (UPDATE/v1alpha1)", func() {
returnedCm := v1.ConfigMap{
Data: map[string]string{"policy": validAuditPolicy},
}
apiServerConfig := shootv1alpha1.Spec.Kubernetes.KubeAPIServer.DeepCopy()
shootv1alpha1.Spec.Kubernetes.KubeAPIServer = nil
newShoot := shootv1alpha1.DeepCopy()
newShoot.Spec.Kubernetes.KubeAPIServer = apiServerConfig
mockReader.EXPECT().Get(gomock.Any(), kutil.Key(shootNamespace, cmName), gomock.AssignableToTypeOf(&v1.ConfigMap{})).DoAndReturn(func(_ context.Context, key client.ObjectKey, cm *v1.ConfigMap) error {
*cm = returnedCm
return nil
})
test(admissionv1.Update, shootv1alpha1, newShoot, true, statusCodeAllowed, "referenced audit policy is valid", "")
})
It("referenced auditPolicy name was changed (UPDATE)", func() {
returnedCm := v1.ConfigMap{
Data: map[string]string{"policy": validAuditPolicy},
}
newShoot := shootv1beta1.DeepCopy()
newShoot.Spec.Kubernetes.KubeAPIServer.AuditConfig.AuditPolicy.ConfigMapRef.Name = cmNameOther
mockReader.EXPECT().Get(gomock.Any(), kutil.Key(shootNamespace, cmNameOther), gomock.AssignableToTypeOf(&v1.ConfigMap{})).DoAndReturn(func(_ context.Context, key client.ObjectKey, cm *v1.ConfigMap) error {
*cm = returnedCm
return nil
})
test(admissionv1.Update, shootv1beta1, newShoot, true, statusCodeAllowed, "referenced audit policy is valid", "")
})
It("referenced auditPolicy name was changed (UPDATE/v1alpha1)", func() {
returnedCm := v1.ConfigMap{
Data: map[string]string{"policy": validAuditPolicy},
}
newShoot := shootv1alpha1.DeepCopy()
newShoot.Spec.Kubernetes.KubeAPIServer.AuditConfig.AuditPolicy.ConfigMapRef.Name = cmNameOther
mockReader.EXPECT().Get(gomock.Any(), kutil.Key(shootNamespace, cmNameOther), gomock.AssignableToTypeOf(&v1.ConfigMap{})).DoAndReturn(func(_ context.Context, key client.ObjectKey, cm *v1.ConfigMap) error {
*cm = returnedCm
return nil
})
test(admissionv1.Update, shootv1alpha1, newShoot, true, statusCodeAllowed, "referenced audit policy is valid", "")
})
It("referenced auditPolicy name was removed (UPDATE)", func() {
newShoot := shootv1beta1.DeepCopy()
newShoot.Spec.Kubernetes.KubeAPIServer = nil
test(admissionv1.Update, shootv1beta1, newShoot, true, statusCodeAllowed, "shoot resource is not specifying any audit policy", "")
})
It("referenced auditPolicy name was removed (UPDATE/v1alpha1)", func() {
newShoot := shootv1alpha1.DeepCopy()
newShoot.Spec.Kubernetes.KubeAPIServer = nil
test(admissionv1.Update, shootv1alpha1, newShoot, true, statusCodeAllowed, "shoot resource is not specifying any audit policy", "")
})
It("should not validate auditPolicy if already marked for deletion (UPDATE)", func() {
now := metav1.Now()
shootv1beta1.DeletionTimestamp = &now
newShoot := shootv1beta1.DeepCopy()
newShoot.Labels = map[string]string{
"foo": "bar",
}
test(admissionv1.Update, shootv1beta1, newShoot, true, statusCodeAllowed, "marked for deletion", "")
})
It("should not validate auditPolicy if spec wasn't changed (UPDATE)", func() {
newShoot := shootv1beta1.DeepCopy()
newShoot.Labels = map[string]string{
"foo": "bar",
}
test(admissionv1.Update, shootv1beta1, newShoot, true, statusCodeAllowed, "shoot spec was not changed", "")
})
})
Context("Deny", func() {
It("references a configmap that does not exist", func() {
mockReader.EXPECT().Get(gomock.Any(), kutil.Key(shootNamespace, cmName), &v1.ConfigMap{}).DoAndReturn(func(_ context.Context, key client.ObjectKey, cm *v1.ConfigMap) error {
return apierrors.NewNotFound(schema.GroupResource{Resource: "configmaps"}, cmName)
})
test(admissionv1.Create, nil, shootv1beta1, false, statusCodeInvalid, "referenced audit policy does not exist", "")
})
It("fails getting cm", func() {
mockReader.EXPECT().Get(gomock.Any(), kutil.Key(shootNamespace, cmName), &v1.ConfigMap{}).DoAndReturn(func(_ context.Context, key client.ObjectKey, cm *v1.ConfigMap) error {
return fmt.Errorf("fake")
})
test(admissionv1.Create, nil, shootv1beta1, false, statusCodeInternalError, "could not retrieve config map: fake", "")
})
It("references configmap without a policy key", func() {
mockReader.EXPECT().Get(gomock.Any(), kutil.Key(shootNamespace, cmName), &v1.ConfigMap{}).DoAndReturn(func(_ context.Context, key client.ObjectKey, cm *v1.ConfigMap) error {
*cm = v1.ConfigMap{
Data: nil,
}
return nil
})
test(admissionv1.Create, nil, shootv1beta1, false, statusCodeInvalid, "missing '.data.policy' in audit policy configmap", "")
})
It("references audit policy which breaks validation rules", func() {
returnedCm := v1.ConfigMap{
TypeMeta: metav1.TypeMeta{},
ObjectMeta: metav1.ObjectMeta{ResourceVersion: "2"},
Data: map[string]string{"policy": invalidAuditPolicy},
}
mockReader.EXPECT().Get(gomock.Any(), kutil.Key(shootNamespace, cmName), gomock.AssignableToTypeOf(&v1.ConfigMap{})).DoAndReturn(func(_ context.Context, key client.ObjectKey, cm *v1.ConfigMap) error {
*cm = returnedCm
return nil
})
test(admissionv1.Create, nil, shootv1beta1, false, statusCodeInvalid, "Unsupported value: \"FakeLevel\"", "")
})
It("references audit policy with invalid structure", func() {
returnedCm := v1.ConfigMap{
TypeMeta: metav1.TypeMeta{},
ObjectMeta: metav1.ObjectMeta{ResourceVersion: "2"},
Data: map[string]string{"policy": missingKeyAuditPolicy},
}
mockReader.EXPECT().Get(gomock.Any(), kutil.Key(shootNamespace, cmName), gomock.AssignableToTypeOf(&v1.ConfigMap{})).DoAndReturn(func(_ context.Context, key client.ObjectKey, cm *v1.ConfigMap) error {
*cm = returnedCm
return nil
})
test(admissionv1.Create, nil, shootv1beta1, false, statusCodeInvalid, "did not find expected key", "")
})
})
})
Context("Configmaps", func() {
BeforeEach(func() {
request.Kind = metav1.GroupVersionKind{Group: "", Version: "v1", Kind: "ConfigMap"}
cm = &v1.ConfigMap{
TypeMeta: metav1.TypeMeta{
Kind: "ConfigMap",
APIVersion: "v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: cmName,
Namespace: cmNamespace,
},
Data: map[string]string{
"policy": validAuditPolicy,
},
}
Expect(inject.CacheInto(fakeCache{Reader: fakeClient}, handler)).To(BeTrue())
})
Context("ignored requests", func() {
It("should ignore other operations than UPDATE", func() {
test(admissionv1.Create, cm, cm, true, statusCodeAllowed, "operation is not update", "")
test(admissionv1.Connect, cm, cm, true, statusCodeAllowed, "operation is not update", "")
test(admissionv1.Delete, cm, cm, true, statusCodeAllowed, "operation is not update", "")
})
It("should ignore other resources than Configmaps", func() {
request.Kind = metav1.GroupVersionKind{Group: "foo", Version: "bar", Kind: "baz"}
test(admissionv1.Update, cm, cm, true, statusCodeAllowed, "resource is not core.gardener.cloud/v1beta1.shoot or v1.configmap", "")
})
})
Context("Update", func() {
BeforeEach(func() {
request.Name = cmName
request.Namespace = cmNamespace
})
Context("Allow", func() {
It("is not reference by any shoot", func() {
shootInSameNamespaceButNotReferencing := shootv1beta1.DeepCopy()
shootInSameNamespaceButNotReferencing.Spec.Kubernetes.KubeAPIServer = nil
Expect(fakeClient.Create(ctx, shootInSameNamespaceButNotReferencing)).To(Succeed())
shootInDifferentNamespaceAndReferencing := shootv1beta1.DeepCopy()
shootInDifferentNamespaceAndReferencing.Namespace = shootNamespace + "other"
Expect(fakeClient.Create(ctx, shootInDifferentNamespaceAndReferencing)).To(Succeed())
test(admissionv1.Update, cm, cm, true, statusCodeAllowed, "configmap is not referenced by a Shoot", "")
})
It("did not change policy field", func() {
Expect(fakeClient.Create(ctx, shootv1beta1)).To(Succeed())
test(admissionv1.Update, cm, cm, true, statusCodeAllowed, "audit policy not changed", "")
})
It("should allow if the auditPolicy is changed to something valid", func() {
Expect(fakeClient.Create(ctx, shootv1beta1)).To(Succeed())
shootv1beta1.Spec.Kubernetes.Version = "1.20"
newCm := cm.DeepCopy()
newCm.Data["policy"] = anotherValidAuditPolicy
test(admissionv1.Update, cm, newCm, true, statusCodeAllowed, "configmap change is valid", "")
})
})
Context("Deny", func() {
BeforeEach(func() {
Expect(fakeClient.Create(ctx, shootv1beta1)).To(Succeed())
})
It("has no data key", func() {
newCm := cm.DeepCopy()
newCm.Data = nil
test(admissionv1.Update, cm, newCm, false, statusCodeInvalid, "missing '.data.policy' in audit policy configmap", "")
})
It("has empty policy", func() {
newCm := cm.DeepCopy()
newCm.Data["policy"] = ""
test(admissionv1.Update, cm, newCm, false, statusCodeInvalid, "empty audit policy. Provide non-empty audit policy", "")
})
It("holds audit policy which breaks validation rules", func() {
cm.DeepCopy()
newCm := cm.DeepCopy()
newCm.Data["policy"] = invalidAuditPolicy
test(admissionv1.Update, cm, newCm, false, statusCodeInvalid, "Unsupported value: \"FakeLevel\"", "")
})
It("holds audit policy with invalid YAML structure", func() {
cm.DeepCopy()
newCm := cm.DeepCopy()
newCm.Data["policy"] = missingKeyAuditPolicy
test(admissionv1.Update, cm, newCm, false, statusCodeInvalid, "did not find expected key", "")
})
})
})
})
})
// fakeCache implements cache.Cache by delegating to the given client.Reader.
// This is used to inject a fake cache into the handler that is based on a fake client.
type fakeCache struct {
client.Reader
cache.Informers
}