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// Copyright 2022 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 kmsca
import (
"context"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"reflect"
"strings"
"testing"
"github.com/sigstore/fulcio/pkg/test"
"github.com/sigstore/sigstore/pkg/cryptoutils"
"github.com/sigstore/sigstore/pkg/signature/kms/fake"
)
func TestNewKMSCA(t *testing.T) {
rootCert, rootKey, _ := test.GenerateRootCA()
subCert, subKey, _ := test.GenerateSubordinateCA(rootCert, rootKey)
chain := []*x509.Certificate{subCert, rootCert}
ca, err := NewKMSCA(context.WithValue(context.TODO(), fake.KmsCtxKey{}, subKey), "fakekms://key", chain)
if err != nil {
t.Fatalf("unexpected error creating KMS CA: %v", err)
}
// Expect certificate chain from Root matches provided certificate chain
rootChains, err := ca.TrustBundle(context.TODO())
if err != nil {
t.Fatalf("error fetching root: %v", err)
}
if len(rootChains) != 1 {
t.Fatalf("unexpected number of chains: %d", len(rootChains))
}
if !reflect.DeepEqual(rootChains[0], chain) {
t.Fatalf("cert chains do not match")
}
// Expect signer and certificate's public keys match
ica := ca.(*kmsCA)
certs, signer := ica.GetSignerWithChain()
if err := cryptoutils.EqualKeys(signer.Public(), subKey.Public()); err != nil {
t.Fatalf("keys between CA and signer do not match: %v", err)
}
if !reflect.DeepEqual(certs, []*x509.Certificate{subCert, rootCert}) {
t.Fatalf("expected certificate chains to match")
}
// Failure: Mismatch between signer and certificate key
otherPriv, _ := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
_, err = NewKMSCA(context.WithValue(context.TODO(), fake.KmsCtxKey{}, otherPriv), "fakekms://key", chain)
if err == nil || !strings.Contains(err.Error(), "ecdsa public keys are not equal") {
t.Fatalf("expected error with mismatched public keys, got %v", err)
}
// Failure: Invalid certificate chain
otherRootCert, _, _ := test.GenerateRootCA()
_, err = NewKMSCA(context.WithValue(context.TODO(), fake.KmsCtxKey{}, subKey), "fakekms://key", []*x509.Certificate{subCert, otherRootCert})
if err == nil || !strings.Contains(err.Error(), "certificate signed by unknown authority") {
t.Fatalf("expected error with invalid certificate chain, got %v", err)
}
}
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