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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 baseca
import (
"context"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"encoding/asn1"
"reflect"
"testing"
ct "github.com/google/certificate-transparency-go"
"github.com/sigstore/fulcio/pkg/ca"
"github.com/sigstore/fulcio/pkg/certificate"
"github.com/sigstore/fulcio/pkg/test"
"github.com/sigstore/sigstore/pkg/cryptoutils"
"github.com/sigstore/sigstore/pkg/signature"
)
func TestBaseCARoot(t *testing.T) {
signer, _, err := signature.NewDefaultECDSASignerVerifier()
if err != nil {
t.Fatalf("unexpected error generating signer: %v", err)
}
rootCert, rootKey, _ := test.GenerateRootCA()
subCert, _, _ := test.GenerateSubordinateCA(rootCert, rootKey)
certChain := []*x509.Certificate{subCert, rootCert}
bca := BaseCA{
SignerWithChain: &ca.SignerCerts{Certs: certChain, Signer: signer},
}
rootChains, err := bca.TrustBundle(context.TODO())
if err != nil {
t.Fatalf("unexpected error reading root: %v", err)
}
if len(rootChains) != 1 {
t.Fatalf("unexpected number of chains: %d", len(rootChains))
}
if !reflect.DeepEqual(certChain, rootChains[0]) {
t.Fatal("expected cert chains to be equivalent")
}
}
func TestBaseCAGetSignerWithChain(t *testing.T) {
signer, _, err := signature.NewDefaultECDSASignerVerifier()
if err != nil {
t.Fatalf("unexpected error generating signer: %v", err)
}
rootCert, rootKey, _ := test.GenerateRootCA()
subCert, _, _ := test.GenerateSubordinateCA(rootCert, rootKey)
certChain := []*x509.Certificate{subCert, rootCert}
bca := BaseCA{
SignerWithChain: &ca.SignerCerts{Certs: certChain, Signer: signer},
}
foundCertChain, foundSigner := bca.GetSignerWithChain()
if !reflect.DeepEqual(certChain, foundCertChain) {
t.Fatal("expected cert chains to be equivalent")
}
if err := cryptoutils.EqualKeys(signer.Public(), foundSigner.Public()); err != nil {
t.Fatalf("expected keys to be equivalent, expected %v, got %v, error %v", signer.Public(), foundSigner.Public(), err)
}
}
type testPrincipal struct{}
func (tp testPrincipal) Name(context.Context) string {
return "doesntmatter"
}
func (tp testPrincipal) Embed(_ context.Context, cert *x509.Certificate) (err error) {
cert.EmailAddresses = []string{"alice@example.com"}
cert.ExtraExtensions, err = certificate.Extensions{
Issuer: "example.com",
}.Render()
return
}
func TestCreatePrecertificateAndIssueFinalCertificate(t *testing.T) {
rootCert, rootKey, _ := test.GenerateRootCA()
subCert, subKey, _ := test.GenerateSubordinateCA(rootCert, rootKey)
priv, _ := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
certChain := []*x509.Certificate{subCert, rootCert}
bca := BaseCA{
SignerWithChain: &ca.SignerCerts{Certs: certChain, Signer: subKey},
}
precsc, err := bca.CreatePrecertificate(context.TODO(), testPrincipal{}, priv.Public())
if err != nil {
t.Fatalf("error generating precertificate: %v", err)
}
if !subKey.Equal(precsc.PrivateKey) {
t.Fatal("subordinate private keys are not equal")
}
if !reflect.DeepEqual(certChain, precsc.CertChain) {
t.Fatal("certificate chains are not equal")
}
// check cert doesn't verify due to poison extension
rootPool := x509.NewCertPool()
rootPool.AddCert(precsc.CertChain[1])
subPool := x509.NewCertPool()
subPool.AddCert(precsc.CertChain[0])
_, err = precsc.PreCert.Verify(x509.VerifyOptions{Roots: rootPool, Intermediates: subPool, KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageCodeSigning}})
if err == nil || err.Error() != "x509: unhandled critical extension" {
t.Fatalf("expected unhandled critical ext error, got %v", err)
}
csc, err := bca.IssueFinalCertificate(context.TODO(), precsc, &ct.SignedCertificateTimestamp{SCTVersion: 1})
if err != nil {
t.Fatalf("error issuing certificate: %v", err)
}
// verify will now work since poison extension is removed
_, err = csc.FinalCertificate.Verify(x509.VerifyOptions{Roots: rootPool, Intermediates: subPool, KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageCodeSigning}})
if err != nil {
t.Fatalf("unexpected error verifying final certificate: %v", err)
}
var foundSct bool
for _, ext := range csc.FinalCertificate.Extensions {
if ext.Id.Equal(asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 11129, 2, 4, 2}) {
foundSct = true
}
}
if !foundSct {
t.Fatal("expected SCT extension to be in certificate")
}
}
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