101 lines
2.7 KiB
Go
101 lines
2.7 KiB
Go
package yandex
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import (
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"context"
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"encoding/pem"
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"fmt"
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"io/ioutil"
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"log"
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"github.com/hashicorp/packer-plugin-sdk/multistep"
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packersdk "github.com/hashicorp/packer-plugin-sdk/packer"
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"golang.org/x/crypto/ssh"
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)
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type StepCreateSSHKey struct {
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Debug bool
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DebugKeyPath string
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}
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func (s *StepCreateSSHKey) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
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ui := state.Get("ui").(packersdk.Ui)
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config := state.Get("config").(*Config)
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if config.Communicator.SSHPrivateKeyFile != "" {
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ui.Say("Using existing SSH private key")
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privateKeyBytes, err := config.Communicator.ReadSSHPrivateKeyFile()
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if err != nil {
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state.Put("error", err)
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return multistep.ActionHalt
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}
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key, err := ssh.ParsePrivateKey(privateKeyBytes)
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if err != nil {
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err = fmt.Errorf("Error parsing 'ssh_private_key_file': %s", err)
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ui.Error(err.Error())
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state.Put("error", err)
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return multistep.ActionHalt
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}
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config.Communicator.SSHPublicKey = ssh.MarshalAuthorizedKey(key.PublicKey())
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config.Communicator.SSHPrivateKey = privateKeyBytes
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return multistep.ActionContinue
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}
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ui.Say("Creating temporary ssh key for instance...")
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priv, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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return StepHaltWithError(state, fmt.Errorf("Error generating temporary SSH key: %s", err))
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}
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// ASN.1 DER encoded form
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privDer := x509.MarshalPKCS1PrivateKey(priv)
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privBlk := pem.Block{
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Type: "RSA PRIVATE KEY",
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Headers: nil,
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Bytes: privDer,
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}
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// Marshal the public key into SSH compatible format
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pub, err := ssh.NewPublicKey(&priv.PublicKey)
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if err != nil {
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err = fmt.Errorf("Error creating public ssh key: %s", err)
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ui.Error(err.Error())
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state.Put("error", err)
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return multistep.ActionHalt
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}
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pubSSHFormat := string(ssh.MarshalAuthorizedKey(pub))
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hashMD5 := ssh.FingerprintLegacyMD5(pub)
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hashSHA256 := ssh.FingerprintSHA256(pub)
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log.Printf("[INFO] md5 hash of ssh pub key: %s", hashMD5)
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log.Printf("[INFO] sha256 hash of ssh pub key: %s", hashSHA256)
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// Remember some state for the future
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state.Put("ssh_key_public", pubSSHFormat)
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// Set the private key in the config for later
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config.Communicator.SSHPrivateKey = pem.EncodeToMemory(&privBlk)
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config.Communicator.SSHPublicKey = ssh.MarshalAuthorizedKey(pub)
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// If we're in debug mode, output the private key to the working directory.
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if s.Debug {
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ui.Message(fmt.Sprintf("Saving key for debug purposes: %s", s.DebugKeyPath))
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err := ioutil.WriteFile(s.DebugKeyPath, config.Communicator.SSHPrivateKey, 0600)
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if err != nil {
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return StepHaltWithError(state, fmt.Errorf("Error saving debug key: %s", err))
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}
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}
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return multistep.ActionContinue
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}
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func (s *StepCreateSSHKey) Cleanup(state multistep.StateBag) {
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}
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