Create a password for windows instances when using WinRM communicator and no password is provided.

builder/googlecompute/builder.go

@@ -58,6 +58,10 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 		&StepCreateInstance{
 			Debug: b.config.PackerDebug,
 		},
+		&StepCreateWindowsPassword{
+			Debug:        b.config.PackerDebug,
+			DebugKeyPath: fmt.Sprintf("gce_windows_%s.pem", b.config.PackerBuildName),
+		},
 		&StepInstanceInfo{
 			Debug: b.config.PackerDebug,
 		},
@@ -65,6 +69,7 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 			Config:      &b.config.Comm,
 			Host:        commHost,
 			SSHConfig:   sshConfig,
+			WinRMConfig: winrmConfig,
 		},
 		new(common.StepProvision),
 		new(StepWaitInstanceStartup),

builder/googlecompute/driver.go

@@ -1,5 +1,10 @@
 package googlecompute
 
+import (
+	"crypto/rsa"
+	"time"
+)
+
 // Driver is the interface that has to be implemented to communicate
 // with GCE. The Driver interface exists mostly to allow a mock implementation
 // to be used to test the steps.
@@ -44,6 +49,9 @@ type Driver interface {
 
 	// WaitForInstance waits for an instance to reach the given state.
 	WaitForInstance(state, zone, name string) <-chan error
+
+	// CreateOrResetWindowsPassword creates or resets the password for a user on an Windows instance.
+	CreateOrResetWindowsPassword(zone, name string, config *WindowsPasswordConfig) (<-chan error, error)
 }
 
 type InstanceConfig struct {
@@ -64,3 +72,24 @@ type InstanceConfig struct {
 	Tags                []string
 	Zone                string
 }
+
+// WindowsPasswordConfig is the data structue that GCE needs to encrypt the created
+// windows password.
+type WindowsPasswordConfig struct {
+	key      *rsa.PrivateKey
+	password string
+	UserName string    `json:"userName"`
+	Modulus  string    `json:"modulus"`
+	Exponent string    `json:"exponent"`
+	Email    string    `json:"email"`
+	ExpireOn time.Time `json:"expireOn"`
+}
+
+type windowsPasswordResponse struct {
+	UserName          string `json:"userName"`
+	PasswordFound     bool   `json:"passwordFound"`
+	EncryptedPassword string `json:"encryptedPassword"`
+	Modulus           string `json:"modulus"`
+	Exponent          string `json:"exponent"`
+	ErrorMessage      string `json:"errorMessage"`
+}

builder/googlecompute/driver_gce.go

@@ -1,11 +1,18 @@
 package googlecompute
 
 import (
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/sha1"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
 	"fmt"
 	"log"
 	"net/http"
 	"runtime"
 	"strings"
+	"time"
 
 	"github.com/mitchellh/packer/packer"
 	"github.com/mitchellh/packer/version"
@@ -393,6 +400,112 @@ func (d *driverGCE) RunInstance(c *InstanceConfig) (<-chan error, error) {
 	return errCh, nil
 }
 
+func (d *driverGCE) CreateOrResetWindowsPassword(instance, zone string, c *WindowsPasswordConfig) (<-chan error, error) {
+
+	errCh := make(chan error, 1)
+	go d.createWindowsPassword(errCh, instance, zone, c)
+
+	return errCh, nil
+}
+
+func (d *driverGCE) createWindowsPassword(errCh chan<- error, name, zone string, c *WindowsPasswordConfig) {
+
+	data, err := json.Marshal(c)
+
+	if err != nil {
+		errCh <- err
+		return
+	}
+	dCopy := string(data)
+
+	instance, err := d.service.Instances.Get(d.projectId, zone, name).Do()
+	instance.Metadata.Items = append(instance.Metadata.Items, &compute.MetadataItems{Key: "windows-keys", Value: &dCopy})
+
+	op, err := d.service.Instances.SetMetadata(d.projectId, zone, name, &compute.Metadata{
+		Fingerprint: instance.Metadata.Fingerprint,
+		Items:       instance.Metadata.Items,
+	}).Do()
+
+	if err != nil {
+		errCh <- err
+		return
+	}
+
+	newErrCh := make(chan error, 1)
+	go waitForState(newErrCh, "DONE", d.refreshZoneOp(zone, op))
+
+	select {
+	case err = <-newErrCh:
+	case <-time.After(time.Second * 30):
+		err = errors.New("time out while waiting for instance to create")
+	}
+
+	if err != nil {
+		errCh <- err
+		return
+	}
+
+	timeout := time.Now().Add(time.Minute * 3)
+	hash := sha1.New()
+	random := rand.Reader
+
+	for time.Now().Before(timeout) {
+		if passwordResponses, err := d.getPasswordResponses(zone, name); err == nil {
+			for _, response := range passwordResponses {
+				if response.Modulus == c.Modulus {
+
+					decodedPassword, err := base64.StdEncoding.DecodeString(response.EncryptedPassword)
+
+					if err != nil {
+						errCh <- err
+						return
+					}
+					password, err := rsa.DecryptOAEP(hash, random, c.key, decodedPassword, nil)
+
+					if err != nil {
+						errCh <- err
+						return
+					}
+
+					c.password = string(password)
+					errCh <- nil
+					return
+				}
+			}
+		}
+
+		time.Sleep(2 * time.Second)
+	}
+	err = errors.New("Could not retrieve password. Timed out.")
+
+	errCh <- err
+	return
+
+}
+
+func (d *driverGCE) getPasswordResponses(zone, instance string) ([]windowsPasswordResponse, error) {
+	output, err := d.service.Instances.GetSerialPortOutput(d.projectId, zone, instance).Port(4).Do()
+
+	if err != nil {
+		return nil, err
+	}
+
+	responses := strings.Split(output.Contents, "\n")
+
+	passwordResponses := make([]windowsPasswordResponse, 0, len(responses))
+
+	for _, response := range responses {
+		var passwordResponse windowsPasswordResponse
+		if err := json.Unmarshal([]byte(response), &passwordResponse); err != nil {
+			continue
+		}
+
+		passwordResponses = append(passwordResponses, passwordResponse)
+	}
+
+	return passwordResponses, nil
+}
+
 func (d *driverGCE) WaitForInstance(state, zone, name string) <-chan error {
 	errCh := make(chan error, 1)
 	go waitForState(errCh, state, d.refreshInstanceState(zone, name))

builder/googlecompute/driver_mock.go

@@ -67,6 +67,12 @@ type DriverMock struct {
 	RunInstanceErrCh  <-chan error
 	RunInstanceErr    error
 
+	CreateOrResetWindowsPasswordZone     string
+	CreateOrResetWindowsPasswordInstance string
+	CreateOrResetWindowsPasswordConfig   *WindowsPasswordConfig
+	CreateOrResetWindowsPasswordErr      error
+	CreateOrResetWindowsPasswordErrCh    <-chan error
+
 	WaitForInstanceState string
 	WaitForInstanceZone  string
 	WaitForInstanceName  string
@@ -224,3 +230,25 @@ func (d *DriverMock) WaitForInstance(state, zone, name string) <-chan error {
 
 	return resultCh
 }
+
+func (d *DriverMock) GetWindowsPassword() (string, error) {
+	return "", nil
+}
+
+func (d *DriverMock) CreateOrResetWindowsPassword(instance, zone string, c *WindowsPasswordConfig) (<-chan error, error) {
+
+	d.CreateOrResetWindowsPasswordInstance = instance
+	d.CreateOrResetWindowsPasswordZone = zone
+	d.CreateOrResetWindowsPasswordConfig = c
+
+	c.password = "MOCK_PASSWORD"
+
+	resultCh := d.CreateOrResetWindowsPasswordErrCh
+	if resultCh == nil {
+		ch := make(chan error)
+		close(ch)
+		resultCh = ch
+	}
+
+	return resultCh, d.CreateOrResetWindowsPasswordErr
+}

builder/googlecompute/step_create_instance.go

@@ -76,6 +76,10 @@ func (s *StepCreateInstance) Run(state multistep.StateBag) multistep.StepAction
 		return multistep.ActionHalt
 	}
 
+	if sourceImage.IsWindows() && c.Comm.Type == "winrm" && c.Comm.WinRMPassword == "" {
+		state.Put("create_windows_password", true)
+	}
+
 	ui.Say("Creating instance...")
 	name := c.InstanceName
 

builder/googlecompute/step_create_instance_test.go

@@ -41,6 +41,101 @@ func TestStepCreateInstance(t *testing.T) {
 	assert.Equal(t, d.DeleteDiskZone, c.Zone, "Incorrect disk zone passed to driver.")
 }
 
+func TestStepCreateInstance_windowsNeedsPassword(t *testing.T) {
+
+	state := testState(t)
+	step := new(StepCreateInstance)
+	defer step.Cleanup(state)
+
+	state.Put("ssh_public_key", "key")
+	c := state.Get("config").(*Config)
+	d := state.Get("driver").(*DriverMock)
+	d.GetImageResult = StubImage("test-image", "test-project", []string{"windows"}, 100)
+	c.Comm.Type = "winrm"
+	// run the step
+	if action := step.Run(state); action != multistep.ActionContinue {
+		t.Fatalf("bad action: %#v", action)
+	}
+
+	// Verify state
+	nameRaw, ok := state.GetOk("instance_name")
+	if !ok {
+		t.Fatal("should have instance name")
+	}
+
+	createPassword, ok := state.GetOk("create_windows_password")
+
+	if !ok || !createPassword.(bool) {
+		t.Fatal("should need to create a windows password")
+	}
+
+	// cleanup
+	step.Cleanup(state)
+
+	if d.DeleteInstanceName != nameRaw.(string) {
+		t.Fatal("should've deleted instance")
+	}
+	if d.DeleteInstanceZone != c.Zone {
+		t.Fatalf("bad instance zone: %#v", d.DeleteInstanceZone)
+	}
+
+	if d.DeleteDiskName != c.InstanceName {
+		t.Fatal("should've deleted disk")
+	}
+	if d.DeleteDiskZone != c.Zone {
+		t.Fatalf("bad disk zone: %#v", d.DeleteDiskZone)
+	}
+}
+
+func TestStepCreateInstance_windowsPasswordSet(t *testing.T) {
+
+	state := testState(t)
+	step := new(StepCreateInstance)
+	defer step.Cleanup(state)
+
+	state.Put("ssh_public_key", "key")
+
+	config := state.Get("config").(*Config)
+	driver := state.Get("driver").(*DriverMock)
+	driver.GetImageResult = StubImage("test-image", "test-project", []string{"windows"}, 100)
+	config.Comm.Type = "winrm"
+	config.Comm.WinRMPassword = "password"
+
+	// run the step
+	if action := step.Run(state); action != multistep.ActionContinue {
+		t.Fatalf("bad action: %#v", action)
+	}
+
+	// Verify state
+	nameRaw, ok := state.GetOk("instance_name")
+	if !ok {
+		t.Fatal("should have instance name")
+	}
+
+	_, ok = state.GetOk("create_windows_password")
+
+	if ok {
+		t.Fatal("should not need to create windows password")
+	}
+
+	// cleanup
+	step.Cleanup(state)
+
+	if driver.DeleteInstanceName != nameRaw.(string) {
+		t.Fatal("should've deleted instance")
+	}
+	if driver.DeleteInstanceZone != config.Zone {
+		t.Fatalf("bad instance zone: %#v", driver.DeleteInstanceZone)
+	}
+
+	if driver.DeleteDiskName != config.InstanceName {
+		t.Fatal("should've deleted disk")
+	}
+	if driver.DeleteDiskZone != config.Zone {
+		t.Fatalf("bad disk zone: %#v", driver.DeleteDiskZone)
+	}
+}
+
 func TestStepCreateInstance_error(t *testing.T) {
 	state := testState(t)
 	step := new(StepCreateInstance)

builder/googlecompute/step_create_windows_password.go

@@ -0,0 +1,114 @@
+package googlecompute
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/binary"
+	"encoding/pem"
+	"errors"
+	"fmt"
+	"os"
+	"time"
+
+	"github.com/mitchellh/multistep"
+	"github.com/mitchellh/packer/packer"
+)
+
+// StepCreateWindowsPassword represents a Packer build step that sets the windows password on a Windows GCE instance.
+type StepCreateWindowsPassword struct {
+	Debug        bool
+	DebugKeyPath string
+}
+
+// Run executes the Packer build step that sets the windows password on a Windows GCE instance.
+func (s *StepCreateWindowsPassword) Run(state multistep.StateBag) multistep.StepAction {
+	ui := state.Get("ui").(packer.Ui)
+	d := state.Get("driver").(Driver)
+	c := state.Get("config").(*Config)
+	name := state.Get("instance_name").(string)
+
+	if c.Comm.WinRMPassword != "" {
+		state.Put("winrm_password", c.Comm.WinRMPassword)
+		return multistep.ActionContinue
+	}
+
+	create, ok := state.GetOk("create_windows_password")
+
+	if !ok || !create.(bool) {
+		return multistep.ActionContinue
+
+	}
+	ui.Say("Creating windows user for instance...")
+	priv, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		err := fmt.Errorf("Error creating temporary key: %s", err)
+		state.Put("error", err)
+		ui.Error(err.Error())
+		return multistep.ActionHalt
+	}
+
+	buf := make([]byte, 4)
+	binary.BigEndian.PutUint32(buf, uint32(priv.E))
+
+	data := WindowsPasswordConfig{
+		key:      priv,
+		UserName: c.Comm.WinRMUser,
+		Modulus:  base64.StdEncoding.EncodeToString(priv.N.Bytes()),
+		Exponent: base64.StdEncoding.EncodeToString(buf[1:]),
+		Email:    c.Account.ClientEmail,
+		ExpireOn: time.Now().Add(time.Minute * 5),
+	}
+
+	if s.Debug {
+
+		priv_blk := pem.Block{
+			Type:    "RSA PRIVATE KEY",
+			Headers: nil,
+			Bytes:   x509.MarshalPKCS1PrivateKey(priv),
+		}
+
+		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
+		}
+
+		// Write out the key
+		err = pem.Encode(f, &priv_blk)
+		f.Close()
+		if err != nil {
+			state.Put("error", fmt.Errorf("Error saving debug key: %s", err))
+			return multistep.ActionHalt
+		}
+	}
+
+	errCh, err := d.CreateOrResetWindowsPassword(name, c.Zone, &data)
+
+	if err == nil {
+		ui.Message("Waiting for windows password to complete...")
+		select {
+		case err = <-errCh:
+		case <-time.After(c.stateTimeout):
+			err = errors.New("time out while waiting for the password to be created")
+		}
+	}
+
+	if err != nil {
+		err := fmt.Errorf("Error creating windows password: %s", err)
+		state.Put("error", err)
+		ui.Error(err.Error())
+		return multistep.ActionHalt
+	}
+
+	ui.Message("Created password.")
+
+	state.Put("winrm_password", data.password)
+
+	return multistep.ActionContinue
+}
+
+// Nothing to clean up. The windows password is only created on the single instance.
+func (s *StepCreateWindowsPassword) Cleanup(state multistep.StateBag) {}

builder/googlecompute/step_create_windows_password_test.go

@@ -0,0 +1,162 @@
+package googlecompute
+
+import (
+	"errors"
+	"io/ioutil"
+	"os"
+
+	"github.com/mitchellh/multistep"
+
+	"testing"
+)
+
+func TestStepCreateOrResetWindowsPassword(t *testing.T) {
+	state := testState(t)
+
+	// Step is run after the instance is created so we will have an instance name set
+	state.Put("instance_name", "mock_instance")
+	state.Put("create_windows_password", true)
+
+	step := new(StepCreateWindowsPassword)
+	defer step.Cleanup(state)
+
+	// run the step
+	if action := step.Run(state); action != multistep.ActionContinue {
+		t.Fatalf("bad action: %#v", action)
+	}
+
+	if password, ok := state.GetOk("winrm_password"); !ok || password.(string) != "MOCK_PASSWORD" {
+		t.Fatal("should have a password", password, ok)
+	}
+}
+
+func TestStepCreateOrResetWindowsPassword_passwordSet(t *testing.T) {
+	state := testState(t)
+
+	// Step is run after the instance is created so we will have an instance name set
+	state.Put("instance_name", "mock_instance")
+
+	c := state.Get("config").(*Config)
+
+	c.Comm.WinRMPassword = "password"
+
+	step := new(StepCreateWindowsPassword)
+	defer step.Cleanup(state)
+
+	// run the step
+	if action := step.Run(state); action != multistep.ActionContinue {
+		t.Fatalf("bad action: %#v", action)
+	}
+
+	if password, ok := state.GetOk("winrm_password"); !ok || password.(string) != "password" {
+		t.Fatal("should have used existing password", password, ok)
+	}
+}
+
+func TestStepCreateOrResetWindowsPassword_dontNeedPassword(t *testing.T) {
+	state := testState(t)
+
+	// Step is run after the instance is created so we will have an instance name set
+	state.Put("instance_name", "mock_instance")
+
+	step := new(StepCreateWindowsPassword)
+	defer step.Cleanup(state)
+
+	// run the step
+	if action := step.Run(state); action != multistep.ActionContinue {
+		t.Fatalf("bad action: %#v", action)
+	}
+
+}
+
+func TestStepCreateOrResetWindowsPassword_debug(t *testing.T) {
+	tf, err := ioutil.TempFile("", "packer")
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+	tf.Close()
+
+	state := testState(t)
+	// Step is run after the instance is created so we will have an instance name set
+	state.Put("instance_name", "mock_instance")
+	state.Put("create_windows_password", true)
+
+	step := new(StepCreateWindowsPassword)
+
+	step.Debug = true
+	step.DebugKeyPath = tf.Name()
+
+	defer step.Cleanup(state)
+
+	// run the step
+	if action := step.Run(state); action != multistep.ActionContinue {
+		t.Fatalf("bad action: %#v", action)
+	}
+
+	if password, ok := state.GetOk("winrm_password"); !ok || password.(string) != "MOCK_PASSWORD" {
+		t.Fatal("should have a password", password, ok)
+	}
+
+	if _, err := os.Stat(tf.Name()); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+}
+
+func TestStepCreateOrResetWindowsPassword_error(t *testing.T) {
+	state := testState(t)
+
+	// Step is run after the instance is created so we will have an instance name set
+	state.Put("instance_name", "mock_instance")
+	state.Put("create_windows_password", true)
+
+	step := new(StepCreateWindowsPassword)
+	defer step.Cleanup(state)
+
+	driver := state.Get("driver").(*DriverMock)
+	driver.CreateOrResetWindowsPasswordErr = errors.New("error")
+
+	// run the step
+	if action := step.Run(state); action != multistep.ActionHalt {
+		t.Fatalf("bad action: %#v", action)
+	}
+
+	// Verify state
+	if _, ok := state.GetOk("error"); !ok {
+		t.Fatal("should have error")
+	}
+
+	if _, ok := state.GetOk("winrm_password"); ok {
+		t.Fatal("should NOT have instance name")
+	}
+}
+
+func TestStepCreateOrResetWindowsPassword_errorOnChannel(t *testing.T) {
+	state := testState(t)
+
+	// Step is run after the instance is created so we will have an instance name set
+	state.Put("instance_name", "mock_instance")
+	state.Put("create_windows_password", true)
+
+	step := new(StepCreateWindowsPassword)
+	defer step.Cleanup(state)
+
+	driver := state.Get("driver").(*DriverMock)
+
+	errCh := make(chan error, 1)
+	errCh <- errors.New("error")
+
+	driver.CreateOrResetWindowsPasswordErrCh = errCh
+
+	// run the step
+	if action := step.Run(state); action != multistep.ActionHalt {
+		t.Fatalf("bad action: %#v", action)
+	}
+
+	// Verify state
+	if _, ok := state.GetOk("error"); !ok {
+		t.Fatal("should have error")
+	}
+	if _, ok := state.GetOk("winrm_password"); ok {
+		t.Fatal("should NOT have instance name")
+	}
+}

builder/googlecompute/winrm.go

@@ -0,0 +1,17 @@
+package googlecompute
+
+import (
+	"github.com/mitchellh/multistep"
+	"github.com/mitchellh/packer/helper/communicator"
+)
+
+// winrmConfig returns the WinRM configuration.
+func winrmConfig(state multistep.StateBag) (*communicator.WinRMConfig, error) {
+	config := state.Get("config").(*Config)
+	password := state.Get("winrm_password").(string)
+
+	return &communicator.WinRMConfig{
+		Username: config.Comm.WinRMUser,
+		Password: password,
+	}, nil
+}