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/
tls_helpers.go
185 lines (152 loc) · 4.48 KB
/
tls_helpers.go
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package testhelpers
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"io/ioutil"
"math/big"
"os"
"time"
. "github.com/onsi/gomega"
"net"
)
func GenerateCaAndMutualTlsCerts() (caFileName string, certFileName string, privateKeyFileName string, cert tls.Certificate) {
var (
err error
privKey *rsa.PrivateKey
)
caFileName, privKey, err = buildCaFile()
Expect(err).NotTo(HaveOccurred())
certPem, keyPem, err := buildCertPem(privKey, caFileName)
Expect(err).NotTo(HaveOccurred())
certFileName = writeClientCredFile(certPem)
privateKeyFileName = writeClientCredFile(keyPem)
cert, err = tls.X509KeyPair(certPem, keyPem)
Expect(err).NotTo(HaveOccurred())
return
}
func CertPool(certName string) *x509.CertPool {
certPool := x509.NewCertPool()
caCertificate := mapToX509Cert(certName)
Expect(caCertificate).To(HaveLen(1))
certPool.AddCert(caCertificate[0])
return certPool
}
func mapToX509Cert(PemEncodedCertFilePath string) []*x509.Certificate {
caFile, err := os.Open(PemEncodedCertFilePath)
Expect(err).NotTo(HaveOccurred())
caFileContents, err := ioutil.ReadAll(caFile)
Expect(err).NotTo(HaveOccurred())
caFileBlock, _ := pem.Decode(caFileContents)
caCertificate, err := x509.ParseCertificates(caFileBlock.Bytes)
Expect(err).NotTo(HaveOccurred())
return caCertificate
}
func buildCaFile() (string, *rsa.PrivateKey, error) {
privKey, err := rsa.GenerateKey(rand.Reader, 512)
if err != nil {
return "", nil, err
}
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return "", nil, err
}
now := time.Now()
notAfter := now.Add(365 * 24 * time.Hour)
ca := &x509.Certificate{
SerialNumber: serialNumber,
SignatureAlgorithm: x509.SHA256WithRSA,
Subject: pkix.Name{
Country: []string{"USA"},
Organization: []string{"Cloud Foundry"},
CommonName: "CA",
},
NotBefore: now,
NotAfter: notAfter,
BasicConstraintsValid: true,
IsCA: true,
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
}
caCert, err := x509.CreateCertificate(rand.Reader, ca, ca, &privKey.PublicKey, privKey)
if err != nil {
return "", nil, err
}
file, err := ioutil.TempFile(os.TempDir(), "bosh-dns-adapter-ca")
if err != nil {
return "", nil, err
}
err = pem.Encode(file, &pem.Block{
Type: "CERTIFICATE",
Bytes: caCert,
})
if err != nil {
return "", nil, err
}
return file.Name(), privKey, nil
}
func buildCertPem(privKey *rsa.PrivateKey, caFilePath string) (cert []byte, key []byte, err error) {
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return nil, nil, err
}
now := time.Now()
notAfter := now.Add(365 * 24 * time.Hour)
serverCertTemplate := &x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Country: []string{"USA"},
Organization: []string{"Cloud Foundry"},
},
IPAddresses: []net.IP{net.ParseIP("127.0.0.1")},
NotBefore: now,
NotAfter: notAfter,
BasicConstraintsValid: true,
IsCA: false,
SignatureAlgorithm: x509.SHA256WithRSA,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
}
caBytes, err := ioutil.ReadFile(caFilePath)
if err != nil {
return nil, nil, err
}
caBlockDer, _ := pem.Decode(caBytes)
caCert, err := x509.ParseCertificate(caBlockDer.Bytes)
if err != nil {
return nil, nil, err
}
serverCert, err := x509.CreateCertificate(rand.Reader, serverCertTemplate, caCert, &privKey.PublicKey, privKey)
if err != nil {
return nil, nil, err
}
certBuffer := &bytes.Buffer{}
err = pem.Encode(certBuffer, &pem.Block{
Type: "CERTIFICATE",
Bytes: serverCert,
})
if err != nil {
return nil, nil, err
}
keyBuffer := &bytes.Buffer{}
derEncodedPrivateKey := x509.MarshalPKCS1PrivateKey(privKey)
err = pem.Encode(keyBuffer, &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: derEncodedPrivateKey,
})
if err != nil {
return nil, nil, err
}
return certBuffer.Bytes(), keyBuffer.Bytes(), nil
}
func writeClientCredFile(data []byte) string {
tempFile, err := ioutil.TempFile(os.TempDir(), "clientcredstest")
Expect(err).NotTo(HaveOccurred())
Expect(ioutil.WriteFile(tempFile.Name(), data, os.ModePerm)).To(Succeed())
return tempFile.Name()
}