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renderer_test.go
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//
// Copyright 2024 The Chainloop 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 renderer
import (
"context"
"crypto"
"crypto/elliptic"
"crypto/rand"
"encoding/json"
"encoding/pem"
"os"
"testing"
"github.com/chainloop-dev/chainloop/pkg/attestation/crafter"
v1 "github.com/chainloop-dev/chainloop/pkg/attestation/crafter/api/attestation/v1"
"github.com/chainloop-dev/chainloop/pkg/attestation/signer/chainloop"
"github.com/chainloop-dev/chainloop/pkg/attestation/signer/cosign"
"github.com/rs/zerolog"
"github.com/secure-systems-lab/go-securesystemslib/dsse"
"github.com/sigstore/sigstore/pkg/signature"
sigdsee "github.com/sigstore/sigstore/pkg/signature/dsse"
"github.com/stretchr/testify/suite"
)
type rendererSuite struct {
suite.Suite
sv signature.SignerVerifier
dsseVerifier *dsse.EnvelopeVerifier
cs *crafter.VersionedCraftingState
}
func TestSuite(t *testing.T) {
suite.Run(t, new(rendererSuite))
}
func (s *rendererSuite) SetupTest() {
var err error
s.cs = &crafter.VersionedCraftingState{
CraftingState: &v1.CraftingState{
InputSchema: nil,
Attestation: &v1.Attestation{
Workflow: &v1.WorkflowMetadata{
Name: "my-wf",
},
},
},
}
s.sv, _, err = signature.NewECDSASignerVerifier(elliptic.P256(), rand.Reader, crypto.SHA256)
s.Require().NoError(err)
s.dsseVerifier, err = dsse.NewEnvelopeVerifier(&sigdsee.VerifierAdapter{SignatureVerifier: s.sv})
s.Require().NoError(err)
}
func (s *rendererSuite) TestRender() {
s.Run("generated envelope is always well-formed", func() {
renderer, err := NewAttestationRenderer(s.cs, nil, "", "", s.sv)
s.Require().NoError(err)
envelope, err := renderer.Render(context.TODO())
s.NoError(err)
_, err = s.dsseVerifier.Verify(context.TODO(), envelope)
s.NoError(err)
})
s.Run("simulates double wrapping bug", func() {
doubleWrapper := sigdsee.WrapSigner(s.sv, "application/vnd.in-toto+json")
renderer, err := NewAttestationRenderer(s.cs, nil, "", "", doubleWrapper)
s.Require().NoError(err)
envelope, err := renderer.Render(context.TODO())
s.NoError(err)
_, err = s.dsseVerifier.Verify(context.TODO(), envelope)
s.Error(err)
})
}
func (s *rendererSuite) TestEnvelopeToBundle() {
s.Run("from cosign signer, it doesn't generate any verification material", func() {
envelope, err := testEnvelope("chainloop/testdata/valid.envelope.v2.json")
s.Require().NoError(err)
signer := cosign.NewSigner("", zerolog.Nop())
renderer, err := NewAttestationRenderer(s.cs, nil, "", "", signer)
s.Require().NoError(err)
bundle, err := renderer.envelopeToBundle(*envelope)
s.Require().NoError(err)
s.Equal("application/vnd.dev.sigstore.bundle+json;version=0.3", bundle.MediaType)
s.Equal("application/vnd.in-toto+json", bundle.GetDsseEnvelope().GetPayloadType())
s.Nil(bundle.GetVerificationMaterial().GetContent())
})
s.Run("from keyless signer, it adds intermediate certificates, but not the root CA", func() {
envelope, err := testEnvelope("chainloop/testdata/valid.envelope.v2.json")
s.Require().NoError(err)
cert, err := testCert("chainloop/testdata/cert.pem")
s.Require().NoError(err)
signer := chainloop.NewSigner(nil, zerolog.Nop())
signer.Signer = s.sv
// 2 certs
signer.Chain = []string{cert, "ROOT"}
renderer, err := NewAttestationRenderer(s.cs, nil, "", "", signer)
s.Require().NoError(err)
bundle, err := renderer.envelopeToBundle(*envelope)
s.Require().NoError(err)
s.Equal("application/vnd.dev.sigstore.bundle+json;version=0.3", bundle.MediaType)
s.Equal("application/vnd.in-toto+json", bundle.GetDsseEnvelope().GetPayloadType())
// only 1 cert is added
s.Equal(1, len(bundle.GetVerificationMaterial().GetX509CertificateChain().GetCertificates()))
// and it's the leaf certificate
s.Equal(cert, string(pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: bundle.GetVerificationMaterial().GetX509CertificateChain().GetCertificates()[0].RawBytes}),
))
})
}
func testEnvelope(filePath string) (*dsse.Envelope, error) {
var envelope dsse.Envelope
content, err := os.ReadFile(filePath)
if err != nil {
return nil, err
}
err = json.Unmarshal(content, &envelope)
if err != nil {
return nil, err
}
return &envelope, nil
}
func testCert(filePath string) (string, error) {
content, err := os.ReadFile(filePath)
if err != nil {
return "", err
}
return string(content), nil
}