packer-cn/builder/scaleway/step_create_ssh_key.go

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package scaleway
import (
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"context"
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"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"fmt"
"log"
"os"
"runtime"
"github.com/hashicorp/packer/packer"
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"github.com/hashicorp/packer/packer-plugin-sdk/multistep"
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"golang.org/x/crypto/ssh"
)
type stepCreateSSHKey struct {
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Debug bool
DebugKeyPath string
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}
func (s *stepCreateSSHKey) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction {
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ui := state.Get("ui").(packer.Ui)
config := state.Get("config").(*Config)
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if config.Comm.SSHPrivateKeyFile != "" {
ui.Say("Using existing SSH private key")
privateKeyBytes, err := config.Comm.ReadSSHPrivateKeyFile()
if err != nil {
state.Put("error", err)
return multistep.ActionHalt
}
config.Comm.SSHPrivateKey = privateKeyBytes
config.Comm.SSHPublicKey = nil
return multistep.ActionContinue
}
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ui.Say("Creating temporary ssh key for server...")
priv, err := rsa.GenerateKey(rand.Reader, 4096)
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if err != nil {
err := fmt.Errorf("Error creating temporary SSH key: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
// ASN.1 DER encoded form
priv_der := x509.MarshalPKCS1PrivateKey(priv)
priv_blk := pem.Block{
Type: "RSA PRIVATE KEY",
Headers: nil,
Bytes: priv_der,
}
pub, err := ssh.NewPublicKey(&priv.PublicKey)
if err != nil {
err := fmt.Errorf("Error creating temporary SSH key: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
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log.Printf("temporary ssh key created")
// Remember some state for the future
config.Comm.SSHPrivateKey = pem.EncodeToMemory(&priv_blk)
config.Comm.SSHPublicKey = ssh.MarshalAuthorizedKey(pub)
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// If we're in debug mode, output the private key to the working directory.
if s.Debug {
ui.Message(fmt.Sprintf("Saving key for debug purposes: %s", s.DebugKeyPath))
f, err := os.Create(s.DebugKeyPath)
if err != nil {
state.Put("error", fmt.Errorf("Error saving debug key: %s", err))
return multistep.ActionHalt
}
defer f.Close()
// Write the key out
if _, err := f.Write(pem.EncodeToMemory(&priv_blk)); err != nil {
state.Put("error", fmt.Errorf("Error saving debug key: %s", err))
return multistep.ActionHalt
}
// Chmod it so that it is SSH ready
if runtime.GOOS != "windows" {
if err := f.Chmod(0600); err != nil {
state.Put("error", fmt.Errorf("Error setting permissions of debug key: %s", err))
return multistep.ActionHalt
}
}
}
return multistep.ActionContinue
}
func (s *stepCreateSSHKey) Cleanup(state multistep.StateBag) {
// SSH key is passed via tag. Nothing to do here.
return
}