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certs.go
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certs.go
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package helpers
// from here: https://golang.org/src/crypto/tls/generate_cert.go
import (
"bytes"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"log"
"math/big"
"net"
"os"
"strings"
"sync"
"time"
kubev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
func publicKey(priv interface{}) interface{} {
switch k := priv.(type) {
case *rsa.PrivateKey:
return &k.PublicKey
case *ecdsa.PrivateKey:
return &k.PublicKey
default:
return nil
}
}
func pemBlockForKey(priv interface{}) *pem.Block {
switch k := priv.(type) {
case *rsa.PrivateKey:
return &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(k)}
case *ecdsa.PrivateKey:
b, err := x509.MarshalECPrivateKey(k)
if err != nil {
fmt.Fprintf(os.Stderr, "Unable to marshal ECDSA private key: %v", err)
os.Exit(2)
}
return &pem.Block{Type: "EC PRIVATE KEY", Bytes: b}
default:
return nil
}
}
type Params struct {
Hosts string // Comma-separated hostnames and IPs to generate a certificate for
ValidFrom *time.Time // Creation date
ValidFor *time.Duration // Duration that certificate is valid for
IsCA bool // whether this cert should be its own Certificate Authority
RsaBits int // Size of RSA key to generate. Ignored if EcdsaCurve is set
EcdsaCurve string // ECDSA curve to use to generate a key. Valid values are P224, P256 (recommended), P384, P521
}
func GetCerts(params Params) (string, string) {
if len(params.Hosts) == 0 {
Fail("Missing required --host parameter")
}
var priv interface{}
var err error
switch params.EcdsaCurve {
case "":
if params.RsaBits == 0 {
params.RsaBits = 2048
}
priv, err = rsa.GenerateKey(rand.Reader, params.RsaBits)
case "P224":
priv, err = ecdsa.GenerateKey(elliptic.P224(), rand.Reader)
case "P256":
priv, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
case "P384":
priv, err = ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
case "P521":
priv, err = ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
default:
Fail(fmt.Sprintf("Unrecognized elliptic curve: %q", params.EcdsaCurve))
}
Expect(err).NotTo(HaveOccurred())
var notBefore time.Time
if params.ValidFrom == nil {
notBefore = time.Now().Add(-time.Minute)
} else {
notBefore = *params.ValidFrom
}
if params.ValidFor == nil {
tmp := time.Hour * 24
params.ValidFor = &tmp
}
notAfter := notBefore.Add(*params.ValidFor)
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
log.Fatalf("failed to generate serial number: %s", err)
}
template := x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{"Acme Co"},
},
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
hosts := strings.Split(params.Hosts, ",")
for _, h := range hosts {
if ip := net.ParseIP(h); ip != nil {
template.IPAddresses = append(template.IPAddresses, ip)
} else {
template.DNSNames = append(template.DNSNames, h)
}
}
if params.IsCA {
template.IsCA = true
template.KeyUsage |= x509.KeyUsageCertSign
}
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(priv), priv)
if err != nil {
log.Fatalf("Failed to create certificate: %s", err)
}
var certOut bytes.Buffer
err = pem.Encode(&certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
Expect(err).NotTo(HaveOccurred())
var keyOut bytes.Buffer
err = pem.Encode(&keyOut, pemBlockForKey(priv))
Expect(err).NotTo(HaveOccurred())
return certOut.String(), keyOut.String()
}
var (
getCerts sync.Once
cert string
privKey string
)
func gencerts() {
cert, privKey = GetCerts(Params{
Hosts: "gateway-proxy,knative-proxy,ingress-proxy",
IsCA: true,
})
}
func Certificate() string {
getCerts.Do(gencerts)
return cert
}
func PrivateKey() string {
getCerts.Do(gencerts)
return privKey
}
func GetKubeSecret(name, namespace string) *kubev1.Secret {
return &kubev1.Secret{
Type: kubev1.SecretTypeTLS,
Data: map[string][]byte{
kubev1.TLSCertKey: []byte(Certificate()),
kubev1.TLSPrivateKeyKey: []byte(PrivateKey()),
},
ObjectMeta: metav1.ObjectMeta{
Name: name,
Namespace: namespace,
},
}
}