forked from rancher/cluster-manager
/
ssl.go
188 lines (156 loc) · 4.56 KB
/
ssl.go
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package rancher
import (
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"io/ioutil"
"math/big"
"net"
"os"
"path"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/machine/libmachine/cert"
)
const (
name string = "cattle"
bits int = 2048
)
var (
log = logrus.WithField("component", "cert")
)
func GenerateCert(configPath, certPath, keyPath, chainPath string, hostnames ...string) (string, string, string, error) {
cert, err := ioutil.ReadFile(path.Join(configPath, certPath))
if os.IsNotExist(err) {
return generateCert(hostnames...)
}
if err != nil {
return "", "", "", err
}
key, err := ioutil.ReadFile(path.Join(configPath, keyPath))
if err != nil {
return "", "", "", err
}
chain, err := ioutil.ReadFile(path.Join(configPath, chainPath))
if err != nil {
return "", "", "", err
}
return string(cert), string(key), string(chain), nil
}
func generateCert(hostnames ...string) (string, string, string, error) {
caCert, err := ioutil.TempFile("/tmp", "cacert")
if err != nil {
return "", "", "", err
}
caCert.Close()
defer os.Remove(caCert.Name())
caKey, err := ioutil.TempFile("/tmp", "cakey")
if err != nil {
return "", "", "", err
}
caKey.Close()
defer os.Remove(caKey.Name())
certFile, err := ioutil.TempFile("/tmp", "cert")
if err != nil {
return "", "", "", err
}
certFile.Close()
defer os.Remove(certFile.Name())
key, err := ioutil.TempFile("/tmp", "key")
if err != nil {
return "", "", "", err
}
key.Close()
defer os.Remove(key.Name())
log.Infof("Generating CA TLS certs")
if err := cert.GenerateCACertificate(caCert.Name(), caKey.Name(), name, bits); err != nil {
return "", "", "", err
}
log.Infof("Generating TLS certs")
if err := generateCert2(append([]string{"localhost", "rancher"}, hostnames...), certFile.Name(), key.Name(), caCert.Name(), caKey.Name(), name, bits); err != nil {
return "", "", "", err
}
content := []string{}
for _, f := range []string{certFile.Name(), key.Name(), caCert.Name()} {
bytes, err := ioutil.ReadFile(f)
if err != nil {
return "", "", "", err
}
content = append(content, string(bytes))
}
return content[0], content[1], content[2], nil
}
// Copied from Docker Machine because we needed to set the SAN IP as a DNSName and IPAddress
func generateCert2(hosts []string, certFile, keyFile, caFile, caKeyFile, org string, bits int) error {
template, err := newCertificate(org)
if err != nil {
return err
}
// client
if len(hosts) == 1 && hosts[0] == "" {
template.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth}
template.KeyUsage = x509.KeyUsageDigitalSignature
} else { // server
template.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth}
for _, h := range hosts {
if ip := net.ParseIP(h); ip != nil {
template.IPAddresses = append(template.IPAddresses, ip)
}
template.DNSNames = append(template.DNSNames, h)
}
}
tlsCert, err := tls.LoadX509KeyPair(caFile, caKeyFile)
if err != nil {
return err
}
priv, err := rsa.GenerateKey(rand.Reader, bits)
if err != nil {
return err
}
x509Cert, err := x509.ParseCertificate(tlsCert.Certificate[0])
if err != nil {
return err
}
derBytes, err := x509.CreateCertificate(rand.Reader, template, x509Cert, &priv.PublicKey, tlsCert.PrivateKey)
if err != nil {
return err
}
certOut, err := os.Create(certFile)
if err != nil {
return err
}
pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
certOut.Close()
keyOut, err := os.OpenFile(keyFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
pem.Encode(keyOut, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
keyOut.Close()
return nil
}
func newCertificate(org string) (*x509.Certificate, error) {
now := time.Now()
// need to set notBefore slightly in the past to account for time
// skew in the VMs otherwise the certs sometimes are not yet valid
notBefore := time.Date(now.Year(), now.Month(), now.Day(), now.Hour(), now.Minute()-5, 0, 0, time.Local)
notAfter := notBefore.Add(time.Hour * 24 * 1080)
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return nil, err
}
return &x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{org},
},
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageKeyAgreement,
BasicConstraintsValid: true,
}, nil
}