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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See the LICENSE file in builder/azure for license information.
package lin
import (
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"log"
"math/big"
"time"
"github.com/hashicorp/packer/builder/azure/common/constants"
"github.com/hashicorp/packer/packer"
"github.com/mitchellh/multistep"
)
type StepCreateCert struct {
TmpServiceName string
}
func (s *StepCreateCert) Run(state multistep.StateBag) multistep.StepAction {
ui := state.Get("ui").(packer.Ui)
ui.Say("Creating temporary certificate...")
err := s.createCert(state)
if err != nil {
err = fmt.Errorf("Error creating temporary certificate: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
return multistep.ActionContinue
}
func (s *StepCreateCert) Cleanup(state multistep.StateBag) {}
func (s *StepCreateCert) createCert(state multistep.StateBag) error {
log.Println("createCert: Generating RSA key pair...")
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
err = fmt.Errorf("Failed to Generate Private Key: %s", err)
return err
}
// ASN.1 DER encoded form
privkey := string(pem.EncodeToMemory(&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(priv),
}))
// Set the private key in the state bag for later
state.Put(constants.PrivateKey, privkey)
log.Printf("createCert: Private key:\n%s", privkey)
log.Println("createCert: Creating certificate...")
host := fmt.Sprintf("%s.cloudapp.net", s.TmpServiceName)
notBefore := time.Now()
notAfter := notBefore.Add(365 * 24 * time.Hour)
serialNumber, err := rand.Int(rand.Reader, new(big.Int).Lsh(big.NewInt(1), 128))
if err != nil {
err = fmt.Errorf("Failed to Generate Serial Number: %v", err)
return err
}
template := x509.Certificate{
SerialNumber: serialNumber,
Issuer: pkix.Name{
CommonName: host,
},
Subject: pkix.Name{
CommonName: host,
},
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
if err != nil {
err = fmt.Errorf("Failed to Create Certificate: %s", err)
return err
}
cert := string(pem.EncodeToMemory(&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: derBytes,
}))
state.Put(constants.Certificate, cert)
log.Printf("createCert: Certificate:\n%s", cert)
h := sha1.New()
h.Write(derBytes)
thumbprint := fmt.Sprintf("%X", h.Sum(nil))
state.Put(constants.Thumbprint, thumbprint)
log.Printf("createCert: Thumbprint:\n%s", thumbprint)
return nil
}
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