github.com/angdraug/packer@v1.3.2/builder/oracle/common/step_ssh_key_pair.go (about) 1 package common 2 3 import ( 4 "context" 5 "crypto/rand" 6 "crypto/rsa" 7 "crypto/x509" 8 "encoding/pem" 9 "fmt" 10 "io/ioutil" 11 "os" 12 "runtime" 13 14 "github.com/hashicorp/packer/helper/communicator" 15 "github.com/hashicorp/packer/helper/multistep" 16 "github.com/hashicorp/packer/packer" 17 "golang.org/x/crypto/ssh" 18 ) 19 20 type StepKeyPair struct { 21 Debug bool 22 Comm *communicator.Config 23 DebugKeyPath string 24 } 25 26 func (s *StepKeyPair) Run(_ context.Context, state multistep.StateBag) multistep.StepAction { 27 ui := state.Get("ui").(packer.Ui) 28 29 if s.Comm.SSHPrivateKeyFile != "" { 30 privateKeyBytes, err := ioutil.ReadFile(s.Comm.SSHPrivateKeyFile) 31 if err != nil { 32 err = fmt.Errorf("Error loading configured private key file: %s", err) 33 ui.Error(err.Error()) 34 state.Put("error", err) 35 return multistep.ActionHalt 36 } 37 38 key, err := ssh.ParsePrivateKey(privateKeyBytes) 39 if err != nil { 40 err = fmt.Errorf("Error parsing 'ssh_private_key_file': %s", err) 41 ui.Error(err.Error()) 42 state.Put("error", err) 43 return multistep.ActionHalt 44 } 45 46 s.Comm.SSHPublicKey = ssh.MarshalAuthorizedKey(key.PublicKey()) 47 s.Comm.SSHPrivateKey = privateKeyBytes 48 49 return multistep.ActionContinue 50 } 51 52 ui.Say("Creating temporary ssh key for instance...") 53 54 priv, err := rsa.GenerateKey(rand.Reader, 2048) 55 if err != nil { 56 err = fmt.Errorf("Error creating temporary SSH key: %s", err) 57 ui.Error(err.Error()) 58 state.Put("error", err) 59 return multistep.ActionHalt 60 } 61 62 // ASN.1 DER encoded form 63 privDer := x509.MarshalPKCS1PrivateKey(priv) 64 privBlk := pem.Block{Type: "RSA PRIVATE KEY", Headers: nil, Bytes: privDer} 65 66 // Set the private key in the statebag for later 67 state.Put("privateKey", string(pem.EncodeToMemory(&privBlk))) 68 69 // Marshal the public key into SSH compatible format 70 pub, err := ssh.NewPublicKey(&priv.PublicKey) 71 if err != nil { 72 err = fmt.Errorf("Error marshaling temporary SSH public key: %s", err) 73 ui.Error(err.Error()) 74 state.Put("error", err) 75 return multistep.ActionHalt 76 } 77 78 s.Comm.SSHPublicKey = ssh.MarshalAuthorizedKey(pub) 79 80 // If we're in debug mode, output the private key to the working 81 // directory. 82 if s.Debug { 83 ui.Message(fmt.Sprintf("Saving key for debug purposes: %s", s.DebugKeyPath)) 84 f, err := os.Create(s.DebugKeyPath) 85 if err != nil { 86 err = fmt.Errorf("Error saving debug key: %s", err) 87 ui.Error(err.Error()) 88 state.Put("error", err) 89 return multistep.ActionHalt 90 } 91 defer f.Close() 92 93 // Write the key out 94 if _, err := f.Write(pem.EncodeToMemory(&privBlk)); err != nil { 95 err = fmt.Errorf("Error saving debug key: %s", err) 96 ui.Error(err.Error()) 97 state.Put("error", err) 98 return multistep.ActionHalt 99 } 100 101 // Chmod it so that it is SSH ready 102 if runtime.GOOS != "windows" { 103 if err := f.Chmod(0600); err != nil { 104 err = fmt.Errorf("Error setting permissions of debug key: %s", err) 105 ui.Error(err.Error()) 106 state.Put("error", err) 107 return multistep.ActionHalt 108 } 109 } 110 } 111 112 return multistep.ActionContinue 113 } 114 115 func (s *StepKeyPair) Cleanup(state multistep.StateBag) { 116 // Nothing to do 117 }