github.phpd.cn/hashicorp/packer@v1.3.2/builder/scaleway/step_create_ssh_key.go (about)

     1  package scaleway
     2  
     3  import (
     4  	"context"
     5  	"crypto/rand"
     6  	"crypto/rsa"
     7  	"crypto/x509"
     8  	"encoding/pem"
     9  	"fmt"
    10  	"io/ioutil"
    11  	"log"
    12  	"os"
    13  	"runtime"
    14  
    15  	"github.com/hashicorp/packer/helper/multistep"
    16  	"github.com/hashicorp/packer/packer"
    17  	"golang.org/x/crypto/ssh"
    18  )
    19  
    20  type stepCreateSSHKey struct {
    21  	Debug        bool
    22  	DebugKeyPath string
    23  }
    24  
    25  func (s *stepCreateSSHKey) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
    26  	ui := state.Get("ui").(packer.Ui)
    27  	config := state.Get("config").(*Config)
    28  
    29  	if config.Comm.SSHPrivateKeyFile != "" {
    30  		ui.Say("Using existing SSH private key")
    31  		privateKeyBytes, err := ioutil.ReadFile(config.Comm.SSHPrivateKeyFile)
    32  		if err != nil {
    33  			state.Put("error", fmt.Errorf(
    34  				"Error loading configured private key file: %s", err))
    35  			return multistep.ActionHalt
    36  		}
    37  
    38  		config.Comm.SSHPrivateKey = privateKeyBytes
    39  		config.Comm.SSHPublicKey = nil
    40  
    41  		return multistep.ActionContinue
    42  	}
    43  
    44  	ui.Say("Creating temporary ssh key for server...")
    45  
    46  	priv, err := rsa.GenerateKey(rand.Reader, 4096)
    47  	if err != nil {
    48  		err := fmt.Errorf("Error creating temporary SSH key: %s", err)
    49  		state.Put("error", err)
    50  		ui.Error(err.Error())
    51  		return multistep.ActionHalt
    52  	}
    53  
    54  	// ASN.1 DER encoded form
    55  	priv_der := x509.MarshalPKCS1PrivateKey(priv)
    56  	priv_blk := pem.Block{
    57  		Type:    "RSA PRIVATE KEY",
    58  		Headers: nil,
    59  		Bytes:   priv_der,
    60  	}
    61  
    62  	pub, err := ssh.NewPublicKey(&priv.PublicKey)
    63  	if err != nil {
    64  		err := fmt.Errorf("Error creating temporary SSH key: %s", err)
    65  		state.Put("error", err)
    66  		ui.Error(err.Error())
    67  		return multistep.ActionHalt
    68  	}
    69  
    70  	log.Printf("temporary ssh key created")
    71  
    72  	// Remember some state for the future
    73  	config.Comm.SSHPrivateKey = pem.EncodeToMemory(&priv_blk)
    74  	config.Comm.SSHPublicKey = ssh.MarshalAuthorizedKey(pub)
    75  
    76  	// If we're in debug mode, output the private key to the working directory.
    77  	if s.Debug {
    78  		ui.Message(fmt.Sprintf("Saving key for debug purposes: %s", s.DebugKeyPath))
    79  		f, err := os.Create(s.DebugKeyPath)
    80  		if err != nil {
    81  			state.Put("error", fmt.Errorf("Error saving debug key: %s", err))
    82  			return multistep.ActionHalt
    83  		}
    84  		defer f.Close()
    85  
    86  		// Write the key out
    87  		if _, err := f.Write(pem.EncodeToMemory(&priv_blk)); err != nil {
    88  			state.Put("error", fmt.Errorf("Error saving debug key: %s", err))
    89  			return multistep.ActionHalt
    90  		}
    91  
    92  		// Chmod it so that it is SSH ready
    93  		if runtime.GOOS != "windows" {
    94  			if err := f.Chmod(0600); err != nil {
    95  				state.Put("error", fmt.Errorf("Error setting permissions of debug key: %s", err))
    96  				return multistep.ActionHalt
    97  			}
    98  		}
    99  	}
   100  
   101  	return multistep.ActionContinue
   102  }
   103  
   104  func (s *stepCreateSSHKey) Cleanup(state multistep.StateBag) {
   105  	// SSH key is passed via tag. Nothing to do here.
   106  	return
   107  }