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validator_test.go
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validator_test.go
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//
// Copyright 2021 The Sigstore 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 webhook
import (
"bytes"
"context"
"crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/x509"
"errors"
"fmt"
"net/http"
"net/http/httptest"
"reflect"
"strings"
"testing"
"time"
"github.com/google/go-cmp/cmp"
"github.com/google/go-containerregistry/pkg/authn/k8schain"
"github.com/google/go-containerregistry/pkg/name"
"github.com/sigstore/cosign/pkg/apis/config"
"github.com/sigstore/cosign/pkg/apis/cosigned/v1alpha1"
"github.com/sigstore/cosign/pkg/cosign"
webhookcip "github.com/sigstore/cosign/pkg/cosign/kubernetes/webhook/clusterimagepolicy"
"github.com/sigstore/cosign/pkg/oci"
"github.com/sigstore/cosign/pkg/oci/remote"
"github.com/sigstore/cosign/pkg/oci/static"
batchv1 "k8s.io/api/batch/v1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"knative.dev/pkg/apis"
duckv1 "knative.dev/pkg/apis/duck/v1"
fakekube "knative.dev/pkg/client/injection/kube/client/fake"
fakesecret "knative.dev/pkg/injection/clients/namespacedkube/informers/core/v1/secret/fake"
rtesting "knative.dev/pkg/reconciler/testing"
"knative.dev/pkg/system"
)
const (
fulcioRootCert = "-----BEGIN CERTIFICATE-----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\nOljJotvKidRhAiAuNrIazKEw2G4dw8x1z6EYk9G+7fJP5m93bjm/JfMBtA==\n-----END CERTIFICATE-----"
rekorResponse = "bad response"
// Random public key (cosign generate-key-pair) 2022-03-18
authorityKeyCosignPubString = `-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAENAyijLvRu5QpCPp2uOj8C79ZW1VJ
SID/4H61ZiRzN4nqONzp+ZF22qQTk3MFO3D0/ZKmWHAosIf2pf2GHH7myA==
-----END PUBLIC KEY-----`
)
func TestValidatePodSpec(t *testing.T) {
tag := name.MustParseReference("gcr.io/distroless/static:nonroot")
// Resolved via crane digest on 2021/09/25
digest := name.MustParseReference("gcr.io/distroless/static:nonroot@sha256:be5d77c62dbe7fedfb0a4e5ec2f91078080800ab1f18358e5f31fcc8faa023c4")
ctx, _ := rtesting.SetupFakeContext(t)
si := fakesecret.Get(ctx)
secretName := "blah"
// Non-existent URL for testing complete failure
badURL := apis.HTTP("http://example.com/")
// Spin up a Fulcio that responds with a Root Cert
fulcioServer := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
rw.Write([]byte(fulcioRootCert))
}))
t.Cleanup(fulcioServer.Close)
fulcioURL, err := apis.ParseURL(fulcioServer.URL)
if err != nil {
t.Fatalf("Failed to parse fake Fulcio URL")
}
rekorServer := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
rw.Write([]byte(rekorResponse))
}))
t.Cleanup(rekorServer.Close)
rekorURL, err := apis.ParseURL(rekorServer.URL)
if err != nil {
t.Fatalf("Failed to parse fake Rekor URL")
}
var authorityKeyCosignPub *ecdsa.PublicKey
pems := parsePems([]byte(authorityKeyCosignPubString))
if len(pems) > 0 {
key, _ := x509.ParsePKIXPublicKey(pems[0].Bytes)
authorityKeyCosignPub = key.(*ecdsa.PublicKey)
} else {
t.Errorf("Error parsing authority key from string")
}
si.Informer().GetIndexer().Add(&corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Namespace: system.Namespace(),
Name: secretName,
},
Data: map[string][]byte{
// Random public key (cosign generate-key-pair) 2021-09-25
"cosign.pub": []byte(`-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEapTW568kniCbL0OXBFIhuhOboeox
UoJou2P8sbDxpLiE/v3yLw1/jyOrCPWYHWFXnyyeGlkgSVefG54tNoK7Uw==
-----END PUBLIC KEY-----
`),
},
})
kc := fakekube.Get(ctx)
// Setup service acc and fakeSignaturePullSecrets for "default" and "cosign-system" namespace
for _, ns := range []string{"default", system.Namespace()} {
kc.CoreV1().ServiceAccounts(ns).Create(ctx, &corev1.ServiceAccount{
ObjectMeta: metav1.ObjectMeta{
Name: "default",
},
}, metav1.CreateOptions{})
kc.CoreV1().Secrets(ns).Create(ctx, &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: "fakeSignaturePullSecrets",
},
Data: map[string][]byte{
"dockerconfigjson": []byte(`{"auths":{"https://index.docker.io/v1/":{"username":"username","password":"password","auth":"dXNlcm5hbWU6cGFzc3dvcmQ="}}`),
},
}, metav1.CreateOptions{})
}
v := NewValidator(ctx, secretName)
cvs := cosignVerifySignatures
defer func() {
cosignVerifySignatures = cvs
}()
// Let's just say that everything is verified.
pass := func(_ context.Context, _ name.Reference, _ *cosign.CheckOpts) (checkedSignatures []oci.Signature, bundleVerified bool, err error) {
sig, err := static.NewSignature(nil, "")
if err != nil {
return nil, false, err
}
return []oci.Signature{sig}, true, nil
}
// Let's just say that everything is not verified.
fail := func(_ context.Context, _ name.Reference, _ *cosign.CheckOpts) (checkedSignatures []oci.Signature, bundleVerified bool, err error) {
return nil, false, errors.New("bad signature")
}
// Let's say it is verified if it is the expected Public Key
authorityPublicKeyCVS := func(ctx context.Context, signedImgRef name.Reference, co *cosign.CheckOpts) (checkedSignatures []oci.Signature, bundleVerified bool, err error) {
actualPublicKey, _ := co.SigVerifier.PublicKey()
actualECDSAPubkey := actualPublicKey.(*ecdsa.PublicKey)
actualKeyData := elliptic.Marshal(actualECDSAPubkey, actualECDSAPubkey.X, actualECDSAPubkey.Y)
expectedKeyData := elliptic.Marshal(authorityKeyCosignPub, authorityKeyCosignPub.X, authorityKeyCosignPub.Y)
if bytes.Equal(actualKeyData, expectedKeyData) {
return pass(ctx, signedImgRef, co)
}
return fail(ctx, signedImgRef, co)
}
tests := []struct {
name string
ps *corev1.PodSpec
want *apis.FieldError
cvs func(context.Context, name.Reference, *cosign.CheckOpts) ([]oci.Signature, bool, error)
customContext context.Context
}{{
name: "simple, no error",
ps: &corev1.PodSpec{
InitContainers: []corev1.Container{{
Name: "setup-stuff",
Image: digest.String(),
}},
Containers: []corev1.Container{{
Name: "user-container",
Image: digest.String(),
}},
},
cvs: pass,
}, {
name: "bad reference",
ps: &corev1.PodSpec{
Containers: []corev1.Container{{
Name: "user-container",
Image: "in@valid",
}},
},
want: &apis.FieldError{
Message: `could not parse reference: in@valid`,
Paths: []string{"containers[0].image"},
},
cvs: fail,
}, {
name: "not digest",
ps: &corev1.PodSpec{
Containers: []corev1.Container{{
Name: "user-container",
Image: tag.String(),
}},
},
want: &apis.FieldError{
Message: `invalid value: gcr.io/distroless/static:nonroot must be an image digest`,
Paths: []string{"containers[0].image"},
},
cvs: fail,
}, {
name: "bad signature",
ps: &corev1.PodSpec{
Containers: []corev1.Container{{
Name: "user-container",
Image: digest.String(),
}},
},
want: &apis.FieldError{
Message: `bad signature`,
Paths: []string{"containers[0].image"},
Details: digest.String(),
},
cvs: fail,
}, {
name: "simple, no error, authority key",
ps: &corev1.PodSpec{
InitContainers: []corev1.Container{{
Name: "setup-stuff",
Image: digest.String(),
}},
Containers: []corev1.Container{{
Name: "user-container",
Image: digest.String(),
}},
},
customContext: config.ToContext(context.Background(),
&config.Config{
ImagePolicyConfig: &config.ImagePolicyConfig{
Policies: map[string]webhookcip.ClusterImagePolicy{
"cluster-image-policy": {
Images: []v1alpha1.ImagePattern{{
Glob: "gcr.io/*/*",
}},
Authorities: []webhookcip.Authority{
{
Key: &webhookcip.KeyRef{
Data: authorityKeyCosignPubString,
PublicKeys: []crypto.PublicKey{authorityKeyCosignPub},
},
},
},
},
},
},
},
),
cvs: authorityPublicKeyCVS,
}, {
name: "simple, error, authority keyless, bad fulcio",
ps: &corev1.PodSpec{
InitContainers: []corev1.Container{{
Name: "setup-stuff",
Image: digest.String(),
}},
Containers: []corev1.Container{{
Name: "user-container",
Image: digest.String(),
}},
},
customContext: config.ToContext(context.Background(),
&config.Config{
ImagePolicyConfig: &config.ImagePolicyConfig{
Policies: map[string]webhookcip.ClusterImagePolicy{
"cluster-image-policy-keyless": {
Images: []v1alpha1.ImagePattern{{
Glob: "gcr.io/*/*",
}},
Authorities: []webhookcip.Authority{
{
Keyless: &webhookcip.KeylessRef{
URL: badURL,
},
},
},
},
},
},
},
),
want: func() *apis.FieldError {
var errs *apis.FieldError
fe := apis.ErrGeneric("failed policy: cluster-image-policy-keyless", "image").ViaFieldIndex("initContainers", 0)
fe.Details = fmt.Sprintf("%s %s", digest.String(), `fetching FulcioRoot: getting root cert: parse "http://http:%2F%2Fexample.com%2F/api/v1/rootCert": invalid port ":%2F%2Fexample.com%2F" after host`)
errs = errs.Also(fe)
fe2 := apis.ErrGeneric("failed policy: cluster-image-policy-keyless", "image").ViaFieldIndex("containers", 0)
fe2.Details = fmt.Sprintf("%s %s", digest.String(), `fetching FulcioRoot: getting root cert: parse "http://http:%2F%2Fexample.com%2F/api/v1/rootCert": invalid port ":%2F%2Fexample.com%2F" after host`)
errs = errs.Also(fe2)
return errs
}(),
cvs: fail,
}, {
name: "simple, error, authority keyless, good fulcio, no rekor",
ps: &corev1.PodSpec{
InitContainers: []corev1.Container{{
Name: "setup-stuff",
Image: digest.String(),
}},
Containers: []corev1.Container{{
Name: "user-container",
Image: digest.String(),
}},
},
customContext: config.ToContext(context.Background(),
&config.Config{
ImagePolicyConfig: &config.ImagePolicyConfig{
Policies: map[string]webhookcip.ClusterImagePolicy{
"cluster-image-policy-keyless": {
Images: []v1alpha1.ImagePattern{{
Glob: "gcr.io/*/*",
}},
Authorities: []webhookcip.Authority{
{
Keyless: &webhookcip.KeylessRef{
URL: fulcioURL,
},
},
},
},
},
},
},
),
want: func() *apis.FieldError {
var errs *apis.FieldError
fe := apis.ErrGeneric("failed policy: cluster-image-policy-keyless", "image").ViaFieldIndex("initContainers", 0)
fe.Details = fmt.Sprintf("%s validate signatures with fulcio: bad signature", digest.String())
errs = errs.Also(fe)
fe2 := apis.ErrGeneric("failed policy: cluster-image-policy-keyless", "image").ViaFieldIndex("containers", 0)
fe2.Details = fmt.Sprintf("%s validate signatures with fulcio: bad signature", digest.String())
errs = errs.Also(fe2)
return errs
}(),
cvs: fail,
}, {
name: "simple, authority keyless checks out, good fulcio, bad cip policy",
ps: &corev1.PodSpec{
InitContainers: []corev1.Container{{
Name: "setup-stuff",
Image: digest.String(),
}},
Containers: []corev1.Container{{
Name: "user-container",
Image: digest.String(),
}},
},
customContext: config.ToContext(context.Background(),
&config.Config{
ImagePolicyConfig: &config.ImagePolicyConfig{
Policies: map[string]webhookcip.ClusterImagePolicy{
"cluster-image-policy-keyless": {
Images: []v1alpha1.ImagePattern{{
Glob: "gcr.io/*/*",
}},
Authorities: []webhookcip.Authority{
{
Keyless: &webhookcip.KeylessRef{
URL: fulcioURL,
},
},
},
Policy: &webhookcip.AttestationPolicy{
Name: "invalid json policy",
Type: "cue",
Data: `{"wontgo}`,
},
},
},
},
},
),
want: func() *apis.FieldError {
var errs *apis.FieldError
fe := apis.ErrGeneric("failed policy: cluster-image-policy-keyless", "image").ViaFieldIndex("initContainers", 0)
fe.Details = fmt.Sprintf("%s failed evaluating cue policy for ClusterImagePolicy : failed to compile the cue policy with error: string literal not terminated", digest.String())
errs = errs.Also(fe)
fe2 := apis.ErrGeneric("failed policy: cluster-image-policy-keyless", "image").ViaFieldIndex("containers", 0)
fe2.Details = fmt.Sprintf("%s failed evaluating cue policy for ClusterImagePolicy : failed to compile the cue policy with error: string literal not terminated", digest.String())
errs = errs.Also(fe2)
return errs
}(),
cvs: pass,
}, {
name: "simple, no error, authority keyless, good fulcio",
ps: &corev1.PodSpec{
InitContainers: []corev1.Container{{
Name: "setup-stuff",
Image: digest.String(),
}},
Containers: []corev1.Container{{
Name: "user-container",
Image: digest.String(),
}},
},
customContext: config.ToContext(context.Background(),
&config.Config{
ImagePolicyConfig: &config.ImagePolicyConfig{
Policies: map[string]webhookcip.ClusterImagePolicy{
"cluster-image-policy-keyless": {
Images: []v1alpha1.ImagePattern{{
Glob: "gcr.io/*/*",
}},
Authorities: []webhookcip.Authority{
{
Keyless: &webhookcip.KeylessRef{
URL: fulcioURL,
},
},
},
},
},
},
},
),
cvs: pass,
}, {
name: "simple, error, authority keyless, good fulcio, bad rekor",
ps: &corev1.PodSpec{
InitContainers: []corev1.Container{{
Name: "setup-stuff",
Image: digest.String(),
}},
Containers: []corev1.Container{{
Name: "user-container",
Image: digest.String(),
}},
},
customContext: config.ToContext(context.Background(),
&config.Config{
ImagePolicyConfig: &config.ImagePolicyConfig{
Policies: map[string]webhookcip.ClusterImagePolicy{
"cluster-image-policy-keyless": {
Images: []v1alpha1.ImagePattern{{
Glob: "gcr.io/*/*",
}},
Authorities: []webhookcip.Authority{
{
Keyless: &webhookcip.KeylessRef{
URL: fulcioURL,
},
CTLog: &v1alpha1.TLog{
URL: rekorURL,
},
},
},
},
},
},
},
),
want: func() *apis.FieldError {
var errs *apis.FieldError
fe := apis.ErrGeneric("failed policy: cluster-image-policy-keyless", "image").ViaFieldIndex("initContainers", 0)
fe.Details = fmt.Sprintf("%s validate signatures with fulcio: bad signature", digest.String())
errs = errs.Also(fe)
fe2 := apis.ErrGeneric("failed policy: cluster-image-policy-keyless", "image").ViaFieldIndex("containers", 0)
fe2.Details = fmt.Sprintf("%s validate signatures with fulcio: bad signature", digest.String())
errs = errs.Also(fe2)
return errs
}(),
cvs: fail,
}, {
name: "simple, error, authority source signaturePullSecrets, non exisiting secret",
ps: &corev1.PodSpec{
InitContainers: []corev1.Container{{
Name: "setup-stuff",
Image: digest.String(),
}},
Containers: []corev1.Container{{
Name: "user-container",
Image: digest.String(),
}},
},
customContext: config.ToContext(ctx,
&config.Config{
ImagePolicyConfig: &config.ImagePolicyConfig{
Policies: map[string]webhookcip.ClusterImagePolicy{
"cluster-image-policy": {
Images: []v1alpha1.ImagePattern{{
Glob: "gcr.io/*/*",
}},
Authorities: []webhookcip.Authority{
{
Key: &webhookcip.KeyRef{
Data: authorityKeyCosignPubString,
PublicKeys: []crypto.PublicKey{authorityKeyCosignPub},
},
Sources: []v1alpha1.Source{{
OCI: "example.com/alternative/signature",
SignaturePullSecrets: []corev1.LocalObjectReference{{
Name: "non-existing-secret",
}},
}},
},
},
},
},
},
},
),
want: func() *apis.FieldError {
var errs *apis.FieldError
fe := apis.ErrGeneric("failed policy: cluster-image-policy", "image").ViaFieldIndex("initContainers", 0)
fe.Details = fmt.Sprintf("%s secrets \"non-existing-secret\" not found", digest.String())
errs = errs.Also(fe)
fe2 := apis.ErrGeneric("failed policy: cluster-image-policy", "image").ViaFieldIndex("containers", 0)
fe2.Details = fmt.Sprintf("%s secrets \"non-existing-secret\" not found", digest.String())
errs = errs.Also(fe2)
return errs
}(),
cvs: fail,
}, {
name: "simple, no error, authority source signaturePullSecrets, valid secret",
ps: &corev1.PodSpec{
InitContainers: []corev1.Container{{
Name: "setup-stuff",
Image: digest.String(),
}},
Containers: []corev1.Container{{
Name: "user-container",
Image: digest.String(),
}},
},
customContext: config.ToContext(ctx,
&config.Config{
ImagePolicyConfig: &config.ImagePolicyConfig{
Policies: map[string]webhookcip.ClusterImagePolicy{
"cluster-image-policy": {
Images: []v1alpha1.ImagePattern{{
Glob: "gcr.io/*/*",
}},
Authorities: []webhookcip.Authority{
{
Key: &webhookcip.KeyRef{
Data: authorityKeyCosignPubString,
PublicKeys: []crypto.PublicKey{authorityKeyCosignPub},
},
Sources: []v1alpha1.Source{{
OCI: "example.com/alternative/signature",
SignaturePullSecrets: []corev1.LocalObjectReference{{
Name: "fakeSignaturePullSecrets",
}},
}},
},
},
},
},
},
},
),
cvs: authorityPublicKeyCVS,
}}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
cosignVerifySignatures = test.cvs
testContext := context.Background()
if test.customContext != nil {
testContext = test.customContext
}
// Check the core mechanics
got := v.validatePodSpec(testContext, system.Namespace(), test.ps, k8schain.Options{})
if (got != nil) != (test.want != nil) {
t.Errorf("validatePodSpec() = %v, wanted %v", got, test.want)
} else if got != nil && got.Error() != test.want.Error() {
t.Errorf("validatePodSpec() = %v, wanted %v", got, test.want)
}
// Check wrapped in a Pod
pod := &duckv1.Pod{
Spec: *test.ps,
}
got = v.ValidatePod(testContext, pod)
want := test.want.ViaField("spec")
if (got != nil) != (want != nil) {
t.Errorf("ValidatePod() = %v, wanted %v", got, want)
} else if got != nil && got.Error() != want.Error() {
t.Errorf("ValidatePod() = %v, wanted %v", got, want)
}
// Check that we don't block things being deleted.
pod.DeletionTimestamp = &metav1.Time{Time: time.Now()}
if got := v.ValidatePod(testContext, pod); got != nil {
t.Errorf("ValidatePod() = %v, wanted nil", got)
}
// Check wrapped in a WithPod
withPod := &duckv1.WithPod{
Spec: duckv1.WithPodSpec{
Template: duckv1.PodSpecable{
Spec: *test.ps,
},
},
}
got = v.ValidatePodSpecable(testContext, withPod)
want = test.want.ViaField("spec.template.spec")
if (got != nil) != (want != nil) {
t.Errorf("ValidatePodSpecable() = %v, wanted %v", got, want)
} else if got != nil && got.Error() != want.Error() {
t.Errorf("ValidatePodSpecable() = %v, wanted %v", got, want)
}
// Check that we don't block things being deleted.
withPod.DeletionTimestamp = &metav1.Time{Time: time.Now()}
if got := v.ValidatePodSpecable(testContext, withPod); got != nil {
t.Errorf("ValidatePodSpecable() = %v, wanted nil", got)
}
})
}
}
func TestValidateCronJob(t *testing.T) {
tag := name.MustParseReference("gcr.io/distroless/static:nonroot")
// Resolved via crane digest on 2021/09/25
digest := name.MustParseReference("gcr.io/distroless/static:nonroot@sha256:be5d77c62dbe7fedfb0a4e5ec2f91078080800ab1f18358e5f31fcc8faa023c4")
ctx, _ := rtesting.SetupFakeContext(t)
si := fakesecret.Get(ctx)
secretName := "blah"
si.Informer().GetIndexer().Add(&corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Namespace: system.Namespace(),
Name: secretName,
},
Data: map[string][]byte{
// No data should make us verify against Fulcio.
},
})
kc := fakekube.Get(ctx)
kc.CoreV1().ServiceAccounts("default").Create(ctx, &corev1.ServiceAccount{
ObjectMeta: metav1.ObjectMeta{
Name: "default",
},
}, metav1.CreateOptions{})
v := NewValidator(ctx, secretName)
cvs := cosignVerifySignatures
defer func() {
cosignVerifySignatures = cvs
}()
// Let's just say that everything is verified.
pass := func(ctx context.Context, signedImgRef name.Reference, co *cosign.CheckOpts) (checkedSignatures []oci.Signature, bundleVerified bool, err error) {
sig, err := static.NewSignature(nil, "")
if err != nil {
return nil, false, err
}
return []oci.Signature{sig}, true, nil
}
// Let's just say that everything is not verified.
fail := func(ctx context.Context, signedImgRef name.Reference, co *cosign.CheckOpts) (checkedSignatures []oci.Signature, bundleVerified bool, err error) {
return nil, false, errors.New("bad signature")
}
tests := []struct {
name string
c *duckv1.CronJob
want *apis.FieldError
cvs func(context.Context, name.Reference, *cosign.CheckOpts) ([]oci.Signature, bool, error)
}{{
name: "simple, no error",
c: &duckv1.CronJob{
Spec: batchv1.CronJobSpec{
JobTemplate: batchv1.JobTemplateSpec{
Spec: batchv1.JobSpec{
Template: corev1.PodTemplateSpec{
Spec: corev1.PodSpec{
InitContainers: []corev1.Container{{
Name: "setup-stuff",
Image: digest.String(),
}},
Containers: []corev1.Container{{
Name: "user-container",
Image: digest.String(),
}},
},
},
},
},
},
},
cvs: pass,
}, {
name: "k8schain error (bad service account)",
c: &duckv1.CronJob{
Spec: batchv1.CronJobSpec{
JobTemplate: batchv1.JobTemplateSpec{
Spec: batchv1.JobSpec{
Template: corev1.PodTemplateSpec{
Spec: corev1.PodSpec{
ServiceAccountName: "not-found",
InitContainers: []corev1.Container{{
Name: "setup-stuff",
Image: digest.String(),
}},
Containers: []corev1.Container{{
Name: "user-container",
Image: digest.String(),
}},
},
},
},
},
},
},
want: &apis.FieldError{
Message: `serviceaccounts "not-found" not found`,
Paths: []string{"spec.jobTemplate.spec.template.spec"},
},
}, {
name: "k8schain error (bad pull secret)",
c: &duckv1.CronJob{
Spec: batchv1.CronJobSpec{
JobTemplate: batchv1.JobTemplateSpec{
Spec: batchv1.JobSpec{
Template: corev1.PodTemplateSpec{
Spec: corev1.PodSpec{
ImagePullSecrets: []corev1.LocalObjectReference{{
Name: "not-found",
}},
InitContainers: []corev1.Container{{
Name: "setup-stuff",
Image: digest.String(),
}},
Containers: []corev1.Container{{
Name: "user-container",
Image: digest.String(),
}},
},
},
},
},
},
},
want: &apis.FieldError{
Message: `secrets "not-found" not found`,
Paths: []string{"spec.jobTemplate.spec.template.spec"},
},
}, {
name: "bad reference",
c: &duckv1.CronJob{
Spec: batchv1.CronJobSpec{
JobTemplate: batchv1.JobTemplateSpec{
Spec: batchv1.JobSpec{
Template: corev1.PodTemplateSpec{
Spec: corev1.PodSpec{
Containers: []corev1.Container{{
Name: "user-container",
Image: "in@valid",
}},
},
},
},
},
},
},
want: &apis.FieldError{
Message: `could not parse reference: in@valid`,
Paths: []string{"spec.jobTemplate.spec.template.spec.containers[0].image"},
},
cvs: fail,
}, {
name: "not digest",
c: &duckv1.CronJob{
Spec: batchv1.CronJobSpec{
JobTemplate: batchv1.JobTemplateSpec{
Spec: batchv1.JobSpec{
Template: corev1.PodTemplateSpec{
Spec: corev1.PodSpec{
Containers: []corev1.Container{{
Name: "user-container",
Image: tag.String(),
}},
},
},
},
},
},
},
want: &apis.FieldError{
Message: `invalid value: gcr.io/distroless/static:nonroot must be an image digest`,
Paths: []string{"spec.jobTemplate.spec.template.spec.containers[0].image"},
},
cvs: fail,
}, {
name: "bad signature",
c: &duckv1.CronJob{
Spec: batchv1.CronJobSpec{
JobTemplate: batchv1.JobTemplateSpec{
Spec: batchv1.JobSpec{
Template: corev1.PodTemplateSpec{
Spec: corev1.PodSpec{
Containers: []corev1.Container{{
Name: "user-container",
Image: digest.String(),
}},
},
},
},
},
},
},
want: &apis.FieldError{
Message: `bad signature`,
Paths: []string{"spec.jobTemplate.spec.template.spec.containers[0].image"},
Details: digest.String(),
},
cvs: fail,
}}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
cosignVerifySignatures = test.cvs
// Check the core mechanics
got := v.ValidateCronJob(context.Background(), test.c)
if (got != nil) != (test.want != nil) {
t.Errorf("validateCronJob() = %v, wanted %v", got, test.want)
} else if got != nil && got.Error() != test.want.Error() {
t.Errorf("validateCronJob() = %v, wanted %v", got, test.want)
}
// Check that we don't block things being deleted.
cronJob := test.c.DeepCopy()
cronJob.DeletionTimestamp = &metav1.Time{Time: time.Now()}
if got := v.ValidateCronJob(context.Background(), cronJob); got != nil {
t.Errorf("ValidateCronJob() = %v, wanted nil", got)
}
})
}
}
func TestResolvePodSpec(t *testing.T) {
tag := name.MustParseReference("gcr.io/distroless/static:nonroot")
// Resolved via crane digest on 2021/09/25
digest := name.MustParseReference("gcr.io/distroless/static:nonroot@sha256:be5d77c62dbe7fedfb0a4e5ec2f91078080800ab1f18358e5f31fcc8faa023c4")
ctx, _ := rtesting.SetupFakeContext(t)
si := fakesecret.Get(ctx)
secretName := "blah"
si.Informer().GetIndexer().Add(&corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Namespace: system.Namespace(),
Name: secretName,
},
Data: map[string][]byte{
// Random public key (cosign generate-key-pair) 2021-09-25
"cosign.pub": []byte(`-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEapTW568kniCbL0OXBFIhuhOboeox
UoJou2P8sbDxpLiE/v3yLw1/jyOrCPWYHWFXnyyeGlkgSVefG54tNoK7Uw==
-----END PUBLIC KEY-----
`),
},
})
kc := fakekube.Get(ctx)
kc.CoreV1().ServiceAccounts("default").Create(ctx, &corev1.ServiceAccount{
ObjectMeta: metav1.ObjectMeta{
Name: "default",
},
}, metav1.CreateOptions{})
v := NewValidator(ctx, secretName)
rrd := remoteResolveDigest
defer func() {
remoteResolveDigest = rrd
}()
resolve := func(ref name.Reference, opts ...remote.Option) (name.Digest, error) {
return digest.(name.Digest), nil
}
tests := []struct {
name string
ps *corev1.PodSpec
want *corev1.PodSpec
wc func(context.Context) context.Context
rrd func(name.Reference, ...remote.Option) (name.Digest, error)
}{{
name: "nothing changed (not the right update)",
ps: &corev1.PodSpec{
InitContainers: []corev1.Container{{
Name: "setup-stuff",
Image: tag.String(),
}},
Containers: []corev1.Container{{
Name: "user-container",
Image: tag.String(),
}},
},
want: &corev1.PodSpec{
InitContainers: []corev1.Container{{
Name: "setup-stuff",
Image: tag.String(),
}},
Containers: []corev1.Container{{
Name: "user-container",
Image: tag.String(),
}},
},
rrd: resolve,
}, {
name: "nothing changed (bad reference)",
ps: &corev1.PodSpec{
Containers: []corev1.Container{{
Name: "user-container",
Image: "in@valid",
}},
},
want: &corev1.PodSpec{
Containers: []corev1.Container{{
Name: "user-container",
Image: "in@valid",
}},
},
wc: apis.WithinCreate,
rrd: resolve,
}, {
name: "nothing changed (unable to resolve)",
ps: &corev1.PodSpec{
Containers: []corev1.Container{{
Name: "user-container",
Image: tag.String(),
}},
},
want: &corev1.PodSpec{
Containers: []corev1.Container{{
Name: "user-container",
Image: tag.String(),
}},
},
wc: apis.WithinCreate,
rrd: func(r name.Reference, o ...remote.Option) (name.Digest, error) {
return name.Digest{}, errors.New("boom")
},
}, {
name: "digests resolve (in create)",
ps: &corev1.PodSpec{
InitContainers: []corev1.Container{{
Name: "setup-stuff",
Image: tag.String(),
}},
Containers: []corev1.Container{{
Name: "user-container",
Image: tag.String(),
}},
},
want: &corev1.PodSpec{
InitContainers: []corev1.Container{{
Name: "setup-stuff",
Image: digest.String(),
}},
Containers: []corev1.Container{{
Name: "user-container",
Image: digest.String(),
}},
},
wc: apis.WithinCreate,
rrd: resolve,
}}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
remoteResolveDigest = test.rrd
ctx := context.Background()
if test.wc != nil {
ctx = test.wc(context.Background())
}
// Check the core mechanics.
got := test.ps.DeepCopy()
v.resolvePodSpec(ctx, got, k8schain.Options{})
if !cmp.Equal(got, test.want) {
t.Errorf("resolvePodSpec = %s", cmp.Diff(got, test.want))
}