// Key method for ssh.ClientKeyring interface
func (k *SimpleKeychain) Key(i int) (ssh.PublicKey, error) {
if i < 0 || i >= len(k.keys) {
return nil, nil
}
switch key := k.keys[i].(type) {
case *rsa.PrivateKey:
return ssh.NewRSAPublicKey(&key.PublicKey), nil
case *dsa.PrivateKey:
return ssh.NewDSAPublicKey(&key.PublicKey), nil
}
panic("unknown key type")
}
func (s *stepCreateSSHKey) Run(state multistep.StateBag) multistep.StepAction {
client := state.Get("client").(*DigitalOceanClient)
ui := state.Get("ui").(packer.Ui)
ui.Say("Creating temporary ssh key for droplet...")
priv, err := rsa.GenerateKey(rand.Reader, 2014)
// ASN.1 DER encoded form
priv_der := x509.MarshalPKCS1PrivateKey(priv)
priv_blk := pem.Block{
Type: "RSA PRIVATE KEY",
Headers: nil,
Bytes: priv_der,
}
// Set the private key in the statebag for later
state.Put("privateKey", string(pem.EncodeToMemory(&priv_blk)))
// Marshal the public key into SSH compatible format
pub := ssh.NewRSAPublicKey(&priv.PublicKey)
pub_sshformat := string(ssh.MarshalAuthorizedKey(pub))
// The name of the public key on DO
name := fmt.Sprintf("packer-%s", hex.EncodeToString(identifier.NewUUID().Raw()))
// Create the key!
keyId, err := client.CreateKey(name, pub_sshformat)
if err != nil {
err := fmt.Errorf("Error creating temporary SSH key: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
// We use this to check cleanup
s.keyId = keyId
log.Printf("temporary ssh key name: %s", name)
// Remember some state for the future
state.Put("ssh_key_id", keyId)
return multistep.ActionContinue
}