File size: 3,994 Bytes
7b9f3e3 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 | 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
}
|