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Reject tags in
cosigned. (sigstore#799)
This change makes `cosigned` reject tag references, which can drift after validation has occured rendering the validation we perform ineffective. This also adds unit test coverage for the bulk of the `webhook` package. A subsequent change will introduce a mutating webhook that resolves tags to digests (we still need to validating webhook due to webhook ordering). Related: sigstore#784 Signed-off-by: Matt Moore <mattomata@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| // | ||
| // 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 ( | ||
| "context" | ||
| "errors" | ||
| "testing" | ||
|
|
||
| "github.com/google/go-containerregistry/pkg/name" | ||
| "github.com/sigstore/cosign/pkg/cosign" | ||
| "github.com/sigstore/cosign/pkg/oci" | ||
| "github.com/sigstore/cosign/pkg/oci/static" | ||
| corev1 "k8s.io/api/core/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "knative.dev/pkg/apis" | ||
| fakesecret "knative.dev/pkg/injection/clients/namespacedkube/informers/core/v1/secret/fake" | ||
| rtesting "knative.dev/pkg/reconciler/testing" | ||
| "knative.dev/pkg/system" | ||
| ) | ||
|
|
||
| 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" | ||
|
|
||
| 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----- | ||
| `), | ||
| }, | ||
| }) | ||
|
|
||
| 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 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 | ||
| ps *corev1.PodSpec | ||
| want *apis.FieldError | ||
| cvs func(context.Context, name.Reference, *cosign.CheckOpts) ([]oci.Signature, bool, error) | ||
| }{{ | ||
| 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: `invalid image signature`, | ||
| Paths: []string{"containers[0].image"}, | ||
| }, | ||
| cvs: fail, | ||
| }} | ||
|
|
||
| for _, test := range tests { | ||
| t.Run(test.name, func(t *testing.T) { | ||
| cosignVerifySignatures = test.cvs | ||
| got := v.validatePodSpec(context.Background(), test.ps) | ||
| 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) | ||
| } | ||
| }) | ||
| } | ||
| } |