package digitalocean import ( "context" "crypto/rand" "crypto/rsa" "crypto/x509" "encoding/pem" "fmt" "log" "os" "runtime" "github.com/digitalocean/godo" "github.com/hashicorp/packer/common/uuid" "github.com/hashicorp/packer/helper/multistep" "github.com/hashicorp/packer/packer" "golang.org/x/crypto/ssh" ) type stepCreateSSHKey struct { Debug bool DebugKeyPath string keyId int } func (s *stepCreateSSHKey) Run(_ context.Context, state multistep.StateBag) multistep.StepAction { client := state.Get("client").(*godo.Client) 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 // TODO properly handle the public key error pub, _ := ssh.NewPublicKey(&priv.PublicKey) pub_sshformat := string(ssh.MarshalAuthorizedKey(pub)) // The name of the public key on DO name := fmt.Sprintf("packer-%s", uuid.TimeOrderedUUID()) // Create the key! key, _, err := client.Keys.Create(context.TODO(), &godo.KeyCreateRequest{ Name: name, PublicKey: 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 = key.ID log.Printf("temporary ssh key name: %s", name) // Remember some state for the future state.Put("ssh_key_id", key.ID) // 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) { // If no key name is set, then we never created it, so just return if s.keyId == 0 { return } client := state.Get("client").(*godo.Client) ui := state.Get("ui").(packer.Ui) ui.Say("Deleting temporary ssh key...") _, err := client.Keys.DeleteByID(context.TODO(), s.keyId) if err != nil { log.Printf("Error cleaning up ssh key: %s", err) ui.Error(fmt.Sprintf( "Error cleaning up ssh key. Please delete the key manually: %s", err)) } }