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certtostore_test.go
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certtostore_test.go
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// Copyright 2017 Google Inc.
//
// 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 certtostore
import (
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha256"
"crypto/x509"
"crypto/x509/pkix"
"encoding/base64"
"encoding/hex"
"fmt"
"io/ioutil"
"math/big"
"testing"
"time"
"github.com/google/certtostore/testdata"
)
// TODO(b/142911419): Create OS specific test packages to cover each
// CertStorage implementation independently.
func generateCertificate(caStore CertStorage) (CertStorage, error) {
dir, err := ioutil.TempDir("", "certstorage_cert_test")
if err != nil {
return nil, fmt.Errorf("ioutil.Tempdir: %v", err)
}
leafStore := NewFileStorage(dir)
// Create a leaf certificate request.
b := make([]byte, 8)
if _, err := rand.Read(b); err != nil {
return nil, fmt.Errorf("create random name: %v", err)
}
cn := hex.EncodeToString(b)
template := x509.Certificate{
SerialNumber: new(big.Int).SetBytes(b),
Subject: pkix.Name{
CommonName: cn,
},
NotBefore: time.Now(),
NotAfter: time.Now().Add(10 * time.Minute),
KeyUsage: x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
BasicConstraintsValid: true,
IsCA: false,
SignatureAlgorithm: x509.SHA256WithRSA,
}
opts := GenerateOpts{
Algorithm: RSA,
Size: 2048,
}
if _, err := leafStore.Generate(opts); err != nil {
return nil, fmt.Errorf("leafStore.Generate(%v): %v", opts, err)
}
// Sign the leaf cert request with the CA certificate.
caCrt, err := caStore.Cert()
if err != nil {
return nil, fmt.Errorf("caStore.Cert: %v", err)
}
if caCrt == nil {
return nil, fmt.Errorf("could not read CA certificate")
}
caKey, err := caStore.Key()
if err != nil {
return nil, fmt.Errorf("caStore.Key: %v", err)
}
der, err := x509.CreateCertificate(rand.Reader, &template, caCrt, caKey.Public(), caKey)
if err != nil {
return nil, fmt.Errorf("x509.CreateCertificate: %v", err)
}
// Add the new leaf certificate to the leaf store.
leafCrt, err := x509.ParseCertificate(der)
if err != nil {
return nil, fmt.Errorf("x509.ParseCertificate: %v", err)
}
if err := leafStore.Store(leafCrt, caCrt); err != nil {
return nil, fmt.Errorf("leafStore.Store: %v", err)
}
return leafStore, nil
}
func TestCredential(t *testing.T) {
ca := NewFileStorage(testdata.CAPath())
// Use the CA CertStorage to issue a leaf cert.
leafStore, err := generateCertificate(ca)
if err != nil {
t.Fatalf("error generating certificate: %v", err)
}
// Retrieve the leaf cert.
leafCrt, err := leafStore.Cert()
if err != nil {
t.Fatalf("error retrieving certificate: %v", err)
}
// Retrieve a certificate and key for the CA.
caCrt, err := ca.Cert()
if err != nil {
t.Fatalf("error retrieving CA certificate: %v", err)
}
caKey, err := ca.Key()
if err != nil {
t.Fatalf("error retrieving CA credential: %v", err)
}
// Exercise CertificateChain.
chains, err := leafStore.CertificateChain()
if err != nil {
t.Fatalf("error retrieving certificate chain: %v", err)
}
for ci, chain := range chains {
for i, cert := range chain {
t.Logf("%d.%d: %s", ci, i, cert.Subject)
}
}
if len(chains) != 1 {
t.Fatalf("%d chains found, expected 1", len(chains))
}
if len(chains[0]) < 2 {
t.Fatalf("%d chain entries found, expected at least 2", len(chains[0]))
}
if !leafCrt.Equal(chains[0][0]) {
t.Errorf("certificate chain[0] is not the leaf")
}
if !caCrt.Equal(chains[0][1]) {
t.Errorf("certificate chain[1] is not the ca")
}
// Exercise the CA Public key by verifying the leaf cert.
caPub := caKey.Public()
if caPub == nil {
t.Fatal("CA public key not found")
}
rsaPub, ok := caPub.(*rsa.PublicKey)
if !ok {
t.Fatal("CA public key is not RSA")
}
leafHash := sha256.Sum256(leafCrt.RawTBSCertificate)
if err := rsa.VerifyPKCS1v15(rsaPub, crypto.SHA256, leafHash[:], leafCrt.Signature); err != nil {
t.Fatalf("error verifying certificate signature: %v", err)
}
}
func TestDecrypt(t *testing.T) {
ca := NewFileStorage(testdata.CAPath())
// Decrypt the test message.
caKey, err := ca.Key()
if err != nil {
t.Fatalf("error retrieving CA credential: %v", err)
}
msg, err := base64.StdEncoding.DecodeString(testdata.Ciphertext)
if err != nil {
t.Fatalf("error loading ciphertext: %v", err)
}
plaintext, err := caKey.Decrypt(rand.Reader, msg, nil)
if err != nil {
t.Fatalf("error decrypting ciphertext: %v", err)
}
if string(plaintext) != testdata.Plaintext {
t.Fatalf("plaintext '%v' does not match expected '%v'", string(plaintext), testdata.Plaintext)
}
}
func TestFileStore(t *testing.T) {
pem, err := testdata.Certificate()
if err != nil {
t.Fatalf("testdata.Certificate: %v", err)
}
xc, err := PEMToX509(pem)
if err != nil {
t.Fatalf("error decoding test certificate: %v", err)
}
dir, err := ioutil.TempDir("", "certstorage_test")
if err != nil {
t.Fatalf("failed to create temporary dir: %v", err)
}
tc := NewFileStorage(dir)
cert, err := tc.Cert()
if err != nil {
t.Errorf("error while reading empty cert: %v", err)
}
if cert != nil {
t.Errorf("expected cert on new file store to be nil, instead %v", cert)
}
cert, err = tc.Intermediate()
if err != nil {
t.Errorf("error while reading empty intermediate: %v", err)
}
if cert != nil {
t.Errorf("expected intermediate on new file store to be nil, instead %v", cert)
}
opts := GenerateOpts{
Algorithm: RSA,
Size: 2048,
}
signer, err := tc.Generate(opts)
if err != nil {
t.Errorf("failed to generate signer: %v", err)
}
_, err = x509.CreateCertificateRequest(rand.Reader, &x509.CertificateRequest{}, signer)
if err != nil {
t.Errorf("failed to create signed CSR with signer from Generate: %v", err)
}
if err := tc.Store(xc, xc); err != nil {
t.Errorf("store failed: %v", err)
}
cert, err = tc.Cert()
if err != nil {
t.Fatalf("error while reading back written cert: %v", err)
}
if !cert.Equal(xc) {
t.Errorf("expected read-back cert to match xc, instead it's %v", cert)
}
cert, err = tc.Intermediate()
if err != nil {
t.Fatalf("error while reading back written intermediate: %v", err)
}
if !cert.Equal(xc) {
t.Errorf("expected read-back intermediate to match xc, instead it's %v", cert)
}
}
func TestPEMToX509(t *testing.T) {
pem, err := testdata.Certificate()
if err != nil {
t.Fatalf("testdata.Certificate: %v", err)
}
xc, err := PEMToX509(pem)
if err != nil {
t.Fatalf("error decoding test certificate: %v", err)
}
const issuer = "Dummy OU"
xCissuer := xc.Issuer.OrganizationalUnit[0]
if xCissuer != issuer {
t.Fatalf("unexpected certificate issuer got:%v, want:%v", xCissuer, issuer)
}
}