builder/amazon: StepGetPassword

builder/amazon/common/run_config.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"os"
+	"time"
 
 	"github.com/mitchellh/packer/common/uuid"
 	"github.com/mitchellh/packer/helper/communicator"
@@ -27,6 +28,7 @@ type RunConfig struct {
 	TemporaryKeyPairName     string            `mapstructure:"temporary_key_pair_name"`
 	UserData                 string            `mapstructure:"user_data"`
 	UserDataFile             string            `mapstructure:"user_data_file"`
+	WindowsPasswordTimeout   time.Duration     `mapstructure:"windows_password_timeout"`
 	VpcId                    string            `mapstructure:"vpc_id"`
 
 	// Communicator settings
@@ -40,6 +42,10 @@ func (c *RunConfig) Prepare(ctx *interpolate.Context) []error {
 			"packer %s", uuid.TimeOrderedUUID())
 	}
 
+	if c.WindowsPasswordTimeout == 0 {
+		c.WindowsPasswordTimeout = 10 * time.Minute
+	}
+
 	// Validation
 	errs := c.Comm.Prepare(ctx)
 	if c.SourceAmi == "" {

builder/amazon/common/step_get_password.go

+package common
+
+import (
+	"crypto/rsa"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/pem"
+	"errors"
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/aws/aws-sdk-go/service/ec2"
+	"github.com/mitchellh/multistep"
+	"github.com/mitchellh/packer/helper/communicator"
+	"github.com/mitchellh/packer/packer"
+)
+
+// StepGetPassword reads the password from a Windows server and sets it
+// on the WinRM config.
+type StepGetPassword struct {
+	Comm    *communicator.Config
+	Timeout time.Duration
+}
+
+func (s *StepGetPassword) Run(state multistep.StateBag) multistep.StepAction {
+	ui := state.Get("ui").(packer.Ui)
+	image := state.Get("source_image").(*ec2.Image)
+
+	// Skip if we're not Windows...
+	if *image.Platform != "windows" {
+		log.Printf("[INFO] Not Windows, skipping get password...")
+		return multistep.ActionContinue
+	}
+
+	// If we already have a password, skip it
+	if s.Comm.WinRMPassword != "" {
+		ui.Say("Skipping waiting for password since WinRM password set...")
+		return multistep.ActionContinue
+	}
+
+	// Get the password
+	var password string
+	var err error
+	cancel := make(chan struct{})
+	waitDone := make(chan bool, 1)
+	go func() {
+		ui.Say("Waiting for auto-generated password for instance...")
+		password, err = s.waitForPassword(state, cancel)
+		waitDone <- true
+	}()
+
+	timeout := time.After(s.Timeout)
+WaitLoop:
+	for {
+		// Wait for either SSH to become available, a timeout to occur,
+		// or an interrupt to come through.
+		select {
+		case <-waitDone:
+			if err != nil {
+				ui.Error(fmt.Sprintf("Error waiting for password: %s", err))
+				state.Put("error", err)
+				return multistep.ActionHalt
+			}
+
+			ui.Message("Password retrieved!")
+			s.Comm.WinRMPassword = password
+			break WaitLoop
+		case <-timeout:
+			err := fmt.Errorf("Timeout waiting for password.")
+			state.Put("error", err)
+			ui.Error(err.Error())
+			close(cancel)
+			return multistep.ActionHalt
+		case <-time.After(1 * time.Second):
+			if _, ok := state.GetOk(multistep.StateCancelled); ok {
+				// The step sequence was cancelled, so cancel waiting for password
+				// and just start the halting process.
+				close(cancel)
+				log.Println("[WARN] Interrupt detected, quitting waiting for password.")
+				return multistep.ActionHalt
+			}
+		}
+	}
+	return multistep.ActionContinue
+}
+
+func (s *StepGetPassword) Cleanup(multistep.StateBag) {}
+
+func (s *StepGetPassword) waitForPassword(state multistep.StateBag, cancel <-chan struct{}) (string, error) {
+	ec2conn := state.Get("ec2").(*ec2.EC2)
+	instance := state.Get("instance").(*ec2.Instance)
+	privateKey := state.Get("privateKey").(string)
+
+	for {
+		select {
+		case <-cancel:
+			log.Println("[INFO] Retrieve password wait cancelled. Exiting loop.")
+			return "", errors.New("Retrieve password wait cancelled")
+		case <-time.After(5 * time.Second):
+		}
+
+		resp, err := ec2conn.GetPasswordData(&ec2.GetPasswordDataInput{
+			InstanceID: instance.InstanceID,
+		})
+		if err != nil {
+			err := fmt.Errorf("Error retrieving auto-generated instance password: %s", err)
+			return "", err
+		}
+
+		if resp.PasswordData != nil && *resp.PasswordData != "" {
+			decryptedPassword, err := decryptPasswordDataWithPrivateKey(
+				*resp.PasswordData, []byte(privateKey))
+			if err != nil {
+				err := fmt.Errorf("Error decrypting auto-generated instance password: %s", err)
+				return "", err
+			}
+
+			return decryptedPassword, nil
+		}
+	}
+}
+
+func decryptPasswordDataWithPrivateKey(passwordData string, pemBytes []byte) (string, error) {
+	encryptedPasswd, err := base64.StdEncoding.DecodeString(passwordData)
+	if err != nil {
+		return "", err
+	}
+
+	block, _ := pem.Decode(pemBytes)
+	var asn1Bytes []byte
+	if _, ok := block.Headers["DEK-Info"]; ok {
+		return "", errors.New("encrypted private key isn't yet supported")
+		/*
+			asn1Bytes, err = x509.DecryptPEMBlock(block, password)
+			if err != nil {
+				return "", err
+			}
+		*/
+	} else {
+		asn1Bytes = block.Bytes
+	}
+
+	key, err := x509.ParsePKCS1PrivateKey(asn1Bytes)
+	if err != nil {
+		return "", err
+	}
+
+	out, err := rsa.DecryptPKCS1v15(nil, key, encryptedPasswd)
+	if err != nil {
+		return "", err
+	}
+
+	return string(out), nil
+}

builder/amazon/ebs/builder.go

@@ -113,6 +113,10 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 			BlockDevices:             b.config.BlockDevices,
 			Tags:                     b.config.RunTags,
 		},
+		&awscommon.StepGetPassword{
+			Comm:    &b.config.RunConfig.Comm,
+			Timeout: b.config.WindowsPasswordTimeout,
+		},
 		&communicator.StepConnect{
 			Config: &b.config.RunConfig.Comm,
 			Host: awscommon.SSHHost(