/
cert_helpers.go
244 lines (205 loc) · 5.3 KB
/
cert_helpers.go
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package certhelpers
import (
"bytes"
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"net"
"strings"
"testing"
"time"
)
type CertBuilder struct {
tmpl *x509.Certificate
parentTmpl *x509.Certificate
selfSign bool
parentKey *rsa.PrivateKey
isCA bool
}
type CertOpt func(*CertBuilder) error
func CommonName(cn string) CertOpt {
return func(builder *CertBuilder) error {
builder.tmpl.Subject.CommonName = cn
return nil
}
}
func Parent(parent Certificate) CertOpt {
return func(builder *CertBuilder) error {
builder.parentKey = parent.PrivKey.PrivKey
builder.parentTmpl = parent.Template
return nil
}
}
func IsCA(isCA bool) CertOpt {
return func(builder *CertBuilder) error {
builder.isCA = isCA
return nil
}
}
func SelfSign() CertOpt {
return func(builder *CertBuilder) error {
builder.selfSign = true
return nil
}
}
func IP(ip ...string) CertOpt {
return func(builder *CertBuilder) error {
for _, addr := range ip {
if ipAddr := net.ParseIP(addr); ipAddr != nil {
builder.tmpl.IPAddresses = append(builder.tmpl.IPAddresses, ipAddr)
}
}
return nil
}
}
func DNS(dns ...string) CertOpt {
return func(builder *CertBuilder) error {
builder.tmpl.DNSNames = dns
return nil
}
}
func NewCert(t *testing.T, opts ...CertOpt) (cert Certificate) {
t.Helper()
builder := CertBuilder{
tmpl: &x509.Certificate{
SerialNumber: makeSerial(t),
Subject: pkix.Name{
CommonName: makeCommonName(),
},
NotBefore: time.Now().Add(-1 * time.Hour),
NotAfter: time.Now().Add(1 * time.Hour),
IsCA: false,
KeyUsage: x509.KeyUsageDigitalSignature |
x509.KeyUsageKeyEncipherment |
x509.KeyUsageKeyAgreement,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
},
}
for _, opt := range opts {
err := opt(&builder)
if err != nil {
t.Fatalf("Failed to set up certificate builder: %s", err)
}
}
key := NewPrivateKey(t)
builder.tmpl.SubjectKeyId = getSubjKeyID(t, key.PrivKey)
tmpl := builder.tmpl
parent := builder.parentTmpl
publicKey := key.PrivKey.Public()
signingKey := builder.parentKey
if builder.selfSign {
parent = tmpl
signingKey = key.PrivKey
}
if builder.isCA {
tmpl.IsCA = true
tmpl.KeyUsage = x509.KeyUsageCertSign | x509.KeyUsageCRLSign
tmpl.ExtKeyUsage = nil
} else {
tmpl.KeyUsage = x509.KeyUsageDigitalSignature |
x509.KeyUsageKeyEncipherment |
x509.KeyUsageKeyAgreement
tmpl.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth}
}
certBytes, err := x509.CreateCertificate(rand.Reader, tmpl, parent, publicKey, signingKey)
if err != nil {
t.Fatalf("Unable to generate certificate: %s", err)
}
certPem := pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: certBytes,
})
tlsCert, err := tls.X509KeyPair(certPem, key.Pem)
if err != nil {
t.Fatalf("Unable to parse X509 key pair: %s", err)
}
return Certificate{
Template: tmpl,
PrivKey: key,
TLSCert: tlsCert,
RawCert: certBytes,
Pem: certPem,
IsCA: builder.isCA,
}
}
// ////////////////////////////////////////////////////////////////////////////
// Private Key
// ////////////////////////////////////////////////////////////////////////////
type KeyWrapper struct {
PrivKey *rsa.PrivateKey
Pem []byte
}
func NewPrivateKey(t *testing.T) (key KeyWrapper) {
t.Helper()
privKey, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
t.Fatalf("Unable to generate key for cert: %s", err)
}
privKeyPem := pem.EncodeToMemory(
&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(privKey),
},
)
key = KeyWrapper{
PrivKey: privKey,
Pem: privKeyPem,
}
return key
}
// ////////////////////////////////////////////////////////////////////////////
// Certificate
// ////////////////////////////////////////////////////////////////////////////
type Certificate struct {
PrivKey KeyWrapper
Template *x509.Certificate
TLSCert tls.Certificate
RawCert []byte
Pem []byte
IsCA bool
}
func (cert Certificate) CombinedPEM() []byte {
if cert.IsCA {
return cert.Pem
}
return bytes.Join([][]byte{cert.PrivKey.Pem, cert.Pem}, []byte{'\n'})
}
func (cert Certificate) PrivateKeyPEM() []byte {
return cert.PrivKey.Pem
}
// ////////////////////////////////////////////////////////////////////////////
// Helpers
// ////////////////////////////////////////////////////////////////////////////
func makeSerial(t *testing.T) *big.Int {
t.Helper()
v := &big.Int{}
serialNumberLimit := v.Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
t.Fatalf("Unable to generate serial number: %s", err)
}
return serialNumber
}
// Pulled from sdk/helper/certutil & slightly modified for test usage
func getSubjKeyID(t *testing.T, privateKey crypto.Signer) []byte {
t.Helper()
if privateKey == nil {
t.Fatalf("passed-in private key is nil")
}
marshaledKey, err := x509.MarshalPKIXPublicKey(privateKey.Public())
if err != nil {
t.Fatalf("error marshalling public key: %s", err)
}
subjKeyID := sha1.Sum(marshaledKey)
return subjKeyID[:]
}
func makeCommonName() (cn string) {
return strings.ReplaceAll(time.Now().Format("20060102T150405.000"), ".", "")
}