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cert.go
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cert.go
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package provisioner
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"net"
"time"
)
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
}
func GenerateCACertificate(org string) ([]byte, []byte, error) {
template, err := newCertificate(org)
if err != nil {
return nil, nil, err
}
template.IsCA = true
template.KeyUsage |= x509.KeyUsageCertSign
template.KeyUsage |= x509.KeyUsageKeyEncipherment
template.KeyUsage |= x509.KeyUsageKeyAgreement
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, nil, err
}
derBytes, err := x509.CreateCertificate(rand.Reader, template, template, &priv.PublicKey, priv)
if err != nil {
return nil, nil, err
}
cert := new(bytes.Buffer)
key := new(bytes.Buffer)
pem.Encode(cert, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
pem.Encode(key, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
return cert.Bytes(), key.Bytes(), nil
}
func GenerateClientCertificate(org string, caCert, caKey []byte) ([]byte, []byte, error) {
template, err := newCertificate(org)
if err != nil {
return nil, nil, err
}
template.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth}
template.KeyUsage = x509.KeyUsageDigitalSignature
tlsCert, err := tls.X509KeyPair(caCert, caKey)
if err != nil {
return nil, nil, err
}
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, nil, err
}
x509Cert, err := x509.ParseCertificate(tlsCert.Certificate[0])
if err != nil {
return nil, nil, err
}
derBytes, err := x509.CreateCertificate(rand.Reader, template, x509Cert, &priv.PublicKey, tlsCert.PrivateKey)
if err != nil {
return nil, nil, err
}
cert := new(bytes.Buffer)
key := new(bytes.Buffer)
pem.Encode(cert, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
pem.Encode(key, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
return cert.Bytes(), key.Bytes(), nil
}
func GenerateServerCertificate(org string, caCert, caKey []byte, hosts []string) ([]byte, []byte, error) {
template, err := newCertificate(org)
if err != nil {
return nil, nil, err
}
template.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth}
for _, h := range hosts {
if ip := net.ParseIP(h); ip != nil {
template.IPAddresses = append(template.IPAddresses, ip)
} else {
template.DNSNames = append(template.DNSNames, h)
}
}
tlsCert, err := tls.X509KeyPair(caCert, caKey)
if err != nil {
return nil, nil, err
}
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, nil, err
}
x509Cert, err := x509.ParseCertificate(tlsCert.Certificate[0])
if err != nil {
return nil, nil, err
}
derBytes, err := x509.CreateCertificate(rand.Reader, template, x509Cert, &priv.PublicKey, tlsCert.PrivateKey)
if err != nil {
return nil, nil, err
}
cert := new(bytes.Buffer)
key := new(bytes.Buffer)
pem.Encode(cert, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
pem.Encode(key, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
return cert.Bytes(), key.Bytes(), nil
}