github.com/StackPointCloud/packer@v0.10.2-0.20180716202532-b28098e0f79b/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/multistep" 15 "github.com/hashicorp/packer/packer" 16 "golang.org/x/crypto/ssh" 17 ) 18 19 type StepKeyPair struct { 20 Debug bool 21 DebugKeyPath string 22 PrivateKeyFile string 23 } 24 25 func (s *StepKeyPair) Run(_ context.Context, state multistep.StateBag) multistep.StepAction { 26 ui := state.Get("ui").(packer.Ui) 27 28 if s.PrivateKeyFile != "" { 29 privateKeyBytes, err := ioutil.ReadFile(s.PrivateKeyFile) 30 if err != nil { 31 err = fmt.Errorf("Error loading configured private key file: %s", err) 32 ui.Error(err.Error()) 33 state.Put("error", err) 34 return multistep.ActionHalt 35 } 36 37 key, err := ssh.ParsePrivateKey(privateKeyBytes) 38 if err != nil { 39 err = fmt.Errorf("Error parsing 'ssh_private_key_file': %s", err) 40 ui.Error(err.Error()) 41 state.Put("error", err) 42 return multistep.ActionHalt 43 } 44 45 state.Put("publicKey", string(ssh.MarshalAuthorizedKey(key.PublicKey()))) 46 state.Put("privateKey", string(privateKeyBytes)) 47 48 return multistep.ActionContinue 49 } 50 51 ui.Say("Creating temporary ssh key for instance...") 52 53 priv, err := rsa.GenerateKey(rand.Reader, 2048) 54 if err != nil { 55 err = fmt.Errorf("Error creating temporary SSH key: %s", err) 56 ui.Error(err.Error()) 57 state.Put("error", err) 58 return multistep.ActionHalt 59 } 60 61 // ASN.1 DER encoded form 62 privDer := x509.MarshalPKCS1PrivateKey(priv) 63 privBlk := pem.Block{Type: "RSA PRIVATE KEY", Headers: nil, Bytes: privDer} 64 65 // Set the private key in the statebag for later 66 state.Put("privateKey", string(pem.EncodeToMemory(&privBlk))) 67 68 // Marshal the public key into SSH compatible format 69 pub, err := ssh.NewPublicKey(&priv.PublicKey) 70 if err != nil { 71 err = fmt.Errorf("Error marshaling temporary SSH public key: %s", err) 72 ui.Error(err.Error()) 73 state.Put("error", err) 74 return multistep.ActionHalt 75 } 76 77 pubSSHFormat := string(ssh.MarshalAuthorizedKey(pub)) 78 state.Put("publicKey", pubSSHFormat) 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 }