cli: iam destroy (#946)

cli/internal/cloudcmd/clients.go

@@ -13,6 +13,7 @@ import (
 	"github.com/edgelesssys/constellation/v2/cli/internal/terraform"
 	"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
 	"github.com/edgelesssys/constellation/v2/internal/config"
+	tfjson "github.com/hashicorp/terraform-json"
 )
 
 type terraformClient interface {
@@ -22,6 +23,7 @@ type terraformClient interface {
 	Destroy(ctx context.Context) error
 	CleanUpWorkspace() error
 	RemoveInstaller()
+	Show(ctx context.Context) (*tfjson.State, error)
 }
 
 type libvirtRunner interface {

cli/internal/cloudcmd/clients_test.go

@@ -14,6 +14,7 @@ import (
 	"github.com/edgelesssys/constellation/v2/cli/internal/terraform"
 	"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
 	"github.com/edgelesssys/constellation/v2/internal/config"
+	tfjson "github.com/hashicorp/terraform-json"
 
 	"go.uber.org/goleak"
 )
@@ -30,14 +31,17 @@ type stubTerraformClient struct {
 	initSecret             string
 	iamOutput              terraform.IAMOutput
 	uid                    string
+	tfjsonState            *tfjson.State
 	cleanUpWorkspaceCalled bool
 	removeInstallerCalled  bool
 	destroyCalled          bool
+	showCalled             bool
 	createClusterErr       error
 	destroyErr             error
 	prepareWorkspaceErr    error
 	cleanUpWorkspaceErr    error
 	iamOutputErr           error
+	showErr                error
 }
 
 func (c *stubTerraformClient) CreateCluster(ctx context.Context) (terraform.CreateOutput, error) {
@@ -70,6 +74,11 @@ func (c *stubTerraformClient) RemoveInstaller() {
 	c.removeInstallerCalled = true
 }
 
+func (c *stubTerraformClient) Show(ctx context.Context) (*tfjson.State, error) {
+	c.showCalled = true
+	return c.tfjsonState, c.showErr
+}
+
 type stubLibvirtRunner struct {
 	startCalled bool
 	stopCalled  bool

cli/internal/cloudcmd/iam.go

@@ -7,6 +7,9 @@ package cloudcmd
 
 import (
 	"context"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"path"
@@ -15,9 +18,65 @@ import (
 	"github.com/edgelesssys/constellation/v2/cli/internal/iamid"
 	"github.com/edgelesssys/constellation/v2/cli/internal/terraform"
 	"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
+	"github.com/edgelesssys/constellation/v2/internal/cloud/gcpshared"
 	"github.com/edgelesssys/constellation/v2/internal/constants"
 )
 
+// IAMDestroyer destroys an IAM configuration.
+type IAMDestroyer struct {
+	client terraformClient
+}
+
+// NewIAMDestroyer creates a new IAM Destroyer.
+func NewIAMDestroyer(ctx context.Context) (*IAMDestroyer, error) {
+	cl, err := terraform.New(ctx, constants.TerraformIAMWorkingDir)
+	if err != nil {
+		return nil, err
+	}
+	return &IAMDestroyer{client: cl}, nil
+}
+
+// GetTfstateServiceAccountKey returns the sa_key output from the terraform state.
+func (d *IAMDestroyer) GetTfstateServiceAccountKey(ctx context.Context) (gcpshared.ServiceAccountKey, error) {
+	tfState, err := d.client.Show(ctx)
+	if err != nil {
+		return gcpshared.ServiceAccountKey{}, err
+	}
+
+	if tfState.Values == nil {
+		return gcpshared.ServiceAccountKey{}, errors.New("no Values field in terraform state")
+	}
+
+	saKeyJSON := tfState.Values.Outputs["sa_key"]
+	if saKeyJSON == nil {
+		return gcpshared.ServiceAccountKey{}, errors.New("no sa_key in outputs of the terraform state")
+	}
+
+	saKeyString, ok := saKeyJSON.Value.(string)
+	if !ok {
+		return gcpshared.ServiceAccountKey{}, errors.New("sa_key field in terraform state is not a string")
+	}
+	saKey, err := base64.StdEncoding.DecodeString(saKeyString)
+	if err != nil {
+		return gcpshared.ServiceAccountKey{}, err
+	}
+
+	var tfSaKey gcpshared.ServiceAccountKey
+	if err := json.Unmarshal(saKey, &tfSaKey); err != nil {
+		return gcpshared.ServiceAccountKey{}, err
+	}
+
+	return tfSaKey, nil
+}
+
+// DestroyIAMConfiguration destroys the previously created IAM configuration and deletes the local IAM terraform files.
+func (d *IAMDestroyer) DestroyIAMConfiguration(ctx context.Context) error {
+	if err := d.client.Destroy(ctx); err != nil {
+		return err
+	}
+	return d.client.CleanUpWorkspace()
+}
+
 // IAMCreator creates the IAM configuration on the cloud provider.
 type IAMCreator struct {
 	out                io.Writer

cli/internal/cloudcmd/iam_test.go

@@ -8,13 +8,18 @@ package cloudcmd
 import (
 	"bytes"
 	"context"
+	"encoding/base64"
+	"encoding/json"
 	"errors"
 	"testing"
 
 	"github.com/edgelesssys/constellation/v2/cli/internal/iamid"
 	"github.com/edgelesssys/constellation/v2/cli/internal/terraform"
 	"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
+	"github.com/edgelesssys/constellation/v2/internal/cloud/gcpshared"
+	tfjson "github.com/hashicorp/terraform-json"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestIAMCreator(t *testing.T) {
@@ -148,3 +153,186 @@ func TestIAMCreator(t *testing.T) {
 		})
 	}
 }
+
+func TestDestroyIAMConfiguration(t *testing.T) {
+	newError := func() error {
+		return errors.New("failed")
+	}
+
+	testCases := map[string]struct {
+		tfClient                   *stubTerraformClient
+		wantErr                    bool
+		wantDestroyCalled          bool
+		wantCleanupWorkspaceCalled bool
+	}{
+		"destroy error": {
+			tfClient:          &stubTerraformClient{destroyErr: newError()},
+			wantErr:           true,
+			wantDestroyCalled: true,
+		},
+		"destroy": {
+			tfClient:                   &stubTerraformClient{},
+			wantDestroyCalled:          true,
+			wantCleanupWorkspaceCalled: true,
+		},
+		"cleanup error": {
+			tfClient:                   &stubTerraformClient{cleanUpWorkspaceErr: newError()},
+			wantErr:                    true,
+			wantDestroyCalled:          true,
+			wantCleanupWorkspaceCalled: true,
+		},
+	}
+
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			assert := assert.New(t)
+			destroyer := &IAMDestroyer{client: tc.tfClient}
+
+			err := destroyer.DestroyIAMConfiguration(context.Background())
+
+			if tc.wantErr {
+				assert.Error(err)
+			} else {
+				assert.NoError(err)
+			}
+
+			assert.Equal(tc.wantDestroyCalled, tc.tfClient.destroyCalled)
+			assert.Equal(tc.wantCleanupWorkspaceCalled, tc.tfClient.cleanUpWorkspaceCalled)
+		})
+	}
+}
+
+func TestGetTfstateServiceAccountKey(t *testing.T) {
+	someError := errors.New("failed")
+
+	gcpFile := `
+	{
+		"auth_provider_x509_cert_url": "",
+		"auth_uri": "",
+		"client_email": "",
+		"client_id": "",
+		"client_x509_cert_url": "",
+		"private_key": "",
+		"private_key_id": "",
+		"project_id": "",
+		"token_uri": "",
+		"type": ""
+	}
+	`
+	gcpFileB64 := base64.StdEncoding.EncodeToString([]byte(gcpFile))
+
+	testCases := map[string]struct {
+		cl             *stubTerraformClient
+		wantValidSaKey bool
+		wantErr        bool
+		wantShowCalled bool
+	}{
+		"valid": {
+			cl: &stubTerraformClient{
+				tfjsonState: &tfjson.State{
+					Values: &tfjson.StateValues{
+						Outputs: map[string]*tfjson.StateOutput{
+							"sa_key": {
+								Value: gcpFileB64,
+							},
+						},
+					},
+				},
+			},
+			wantValidSaKey: true,
+			wantShowCalled: true,
+		},
+		"show error": {
+			cl: &stubTerraformClient{
+				showErr: someError,
+			},
+			wantErr:        true,
+			wantShowCalled: true,
+		},
+		"nil tfstate values": {
+			cl: &stubTerraformClient{
+				tfjsonState: &tfjson.State{
+					Values: nil,
+				},
+			},
+			wantErr:        true,
+			wantShowCalled: true,
+		},
+		"no key": {
+			cl: &stubTerraformClient{
+				tfjsonState: &tfjson.State{
+					Values: &tfjson.StateValues{},
+				},
+			},
+			wantErr:        true,
+			wantShowCalled: true,
+		},
+		"invalid base64": {
+			cl: &stubTerraformClient{
+				tfjsonState: &tfjson.State{
+					Values: &tfjson.StateValues{
+						Outputs: map[string]*tfjson.StateOutput{
+							"sa_key": {
+								Value: "iamnotvalid",
+							},
+						},
+					},
+				},
+			},
+			wantErr:        true,
+			wantShowCalled: true,
+		},
+		"valid base64 invalid json": {
+			cl: &stubTerraformClient{
+				tfjsonState: &tfjson.State{
+					Values: &tfjson.StateValues{
+						Outputs: map[string]*tfjson.StateOutput{
+							"sa_key": {
+								Value: base64.StdEncoding.EncodeToString([]byte("asdf")),
+							},
+						},
+					},
+				},
+			},
+			wantErr:        true,
+			wantShowCalled: true,
+		},
+		"not string": {
+			cl: &stubTerraformClient{
+				tfjsonState: &tfjson.State{
+					Values: &tfjson.StateValues{
+						Outputs: map[string]*tfjson.StateOutput{
+							"sa_key": {
+								Value: 1,
+							},
+						},
+					},
+				},
+			},
+			wantErr:        true,
+			wantShowCalled: true,
+		},
+	}
+
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			assert := assert.New(t)
+
+			destroyer := IAMDestroyer{client: tc.cl}
+
+			saKey, err := destroyer.GetTfstateServiceAccountKey(context.Background())
+
+			if tc.wantErr {
+				assert.Error(err)
+				return
+			}
+			assert.NoError(err)
+
+			var saKeyComp gcpshared.ServiceAccountKey
+			require.NoError(t, json.Unmarshal([]byte(gcpFile), &saKeyComp))
+
+			assert.Equal(saKey, saKeyComp)
+			assert.Equal(tc.wantShowCalled, tc.cl.showCalled)
+		})
+	}
+}

cli/internal/cmd/cloud.go

@@ -13,6 +13,7 @@ import (
 	"github.com/edgelesssys/constellation/v2/cli/internal/clusterid"
 	"github.com/edgelesssys/constellation/v2/cli/internal/iamid"
 	"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
+	"github.com/edgelesssys/constellation/v2/internal/cloud/gcpshared"
 	"github.com/edgelesssys/constellation/v2/internal/config"
 )
 
@@ -34,6 +35,11 @@ type cloudIAMCreator interface {
 	) (iamid.File, error)
 }
 
+type iamDestroyer interface {
+	DestroyIAMConfiguration(ctx context.Context) error
+	GetTfstateServiceAccountKey(ctx context.Context) (gcpshared.ServiceAccountKey, error)
+}
+
 type cloudTerminator interface {
 	Terminate(context.Context) error
 }

cli/internal/cmd/cloud_test.go

@@ -14,6 +14,7 @@ import (
 	"github.com/edgelesssys/constellation/v2/cli/internal/clusterid"
 	"github.com/edgelesssys/constellation/v2/cli/internal/iamid"
 	"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
+	"github.com/edgelesssys/constellation/v2/internal/cloud/gcpshared"
 	"github.com/edgelesssys/constellation/v2/internal/config"
 	"go.uber.org/goleak"
 )
@@ -72,3 +73,21 @@ func (c *stubIAMCreator) Create(
 	c.id.CloudProvider = provider
 	return c.id, c.createErr
 }
+
+type stubIAMDestroyer struct {
+	destroyCalled       bool
+	getTfstateKeyCalled bool
+	gcpSaKey            gcpshared.ServiceAccountKey
+	destroyErr          error
+	getTfstateKeyErr    error
+}
+
+func (d *stubIAMDestroyer) DestroyIAMConfiguration(ctx context.Context) error {
+	d.destroyCalled = true
+	return d.destroyErr
+}
+
+func (d *stubIAMDestroyer) GetTfstateServiceAccountKey(ctx context.Context) (gcpshared.ServiceAccountKey, error) {
+	d.getTfstateKeyCalled = true
+	return d.gcpSaKey, d.getTfstateKeyErr
+}

cli/internal/cmd/iam.go

@@ -42,6 +42,7 @@ func NewIAMCmd() *cobra.Command {
 	}
 
 	cmd.AddCommand(newIAMCreateCmd())
+	cmd.AddCommand(newIAMDestroyCmd())
 
 	return cmd
 }
@@ -563,3 +564,18 @@ func parseIDFile(serviceAccountKeyBase64 string) (map[string]string, error) {
 	}
 	return out, nil
 }
+
+// NewIAMDestroyCmd returns a new cobra.Command for the iam destroy subcommand.
+func newIAMDestroyCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "destroy",
+		Short: "Destroy an IAM configuration and delete local terraform files",
+		Long:  "Destroy an IAM configuration and delete local terraform files.",
+		Args:  cobra.ExactArgs(0),
+		RunE:  runIAMDestroy,
+	}
+
+	cmd.Flags().BoolP("yes", "y", false, "destroy the IAM configuration without asking for confirmation")
+
+	return cmd
+}

cli/internal/cmd/iamdestroy.go

@@ -0,0 +1,142 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package cmd
+
+import (
+	"errors"
+	"fmt"
+	"os"
+
+	"github.com/edgelesssys/constellation/v2/cli/internal/cloudcmd"
+	"github.com/edgelesssys/constellation/v2/internal/cloud/gcpshared"
+	"github.com/edgelesssys/constellation/v2/internal/constants"
+	"github.com/edgelesssys/constellation/v2/internal/file"
+	"github.com/spf13/afero"
+	"github.com/spf13/cobra"
+)
+
+func runIAMDestroy(cmd *cobra.Command, _args []string) error {
+	log, err := newCLILogger(cmd)
+	if err != nil {
+		return fmt.Errorf("creating logger: %w", err)
+	}
+	defer log.Sync()
+	spinner := newSpinner(cmd.ErrOrStderr())
+	destroyer, err := cloudcmd.NewIAMDestroyer(cmd.Context())
+	if err != nil {
+		return err
+	}
+	fsHandler := file.NewHandler(afero.NewOsFs())
+
+	c := &destroyCmd{log: log}
+
+	return c.iamDestroy(cmd, spinner, destroyer, fsHandler)
+}
+
+type destroyCmd struct {
+	log debugLog
+}
+
+func (c *destroyCmd) iamDestroy(cmd *cobra.Command, spinner spinnerInterf, destroyer iamDestroyer, fsHandler file.Handler) error {
+	// check if there is a possibility that the cluster is still running by looking out for specific files
+	c.log.Debugf("Checking if %q exists", constants.AdminConfFilename)
+	_, err := fsHandler.Stat(constants.AdminConfFilename)
+	if !errors.Is(err, os.ErrNotExist) {
+		return fmt.Errorf("file %q still exists, please make sure to terminate your cluster before destroying your IAM configuration", constants.AdminConfFilename)
+	}
+	c.log.Debugf("Checking if %q exists", constants.ClusterIDsFileName)
+	_, err = fsHandler.Stat(constants.ClusterIDsFileName)
+	if !errors.Is(err, os.ErrNotExist) {
+		return fmt.Errorf("file %q still exists, please make sure to terminate your cluster before destroying your IAM configuration", constants.ClusterIDsFileName)
+	}
+
+	yes, err := cmd.Flags().GetBool("yes")
+	if err != nil {
+		return err
+	}
+	c.log.Debugf("\"yes\" flag is set to %t", yes)
+
+	gcpFileExists := false
+
+	c.log.Debugf("Checking if %q exists", constants.GCPServiceAccountKeyFile)
+	_, err = fsHandler.Stat(constants.GCPServiceAccountKeyFile)
+	if err != nil {
+		if !errors.Is(err, os.ErrNotExist) {
+			return err
+		}
+	} else {
+		c.log.Debugf("%q exists", constants.GCPServiceAccountKeyFile)
+		gcpFileExists = true
+	}
+
+	if !yes {
+		// Confirmation
+		confirmString := "Do you really want to destroy your IAM configuration?"
+		if gcpFileExists {
+			confirmString += fmt.Sprintf(" (This will also delete %q)", constants.GCPServiceAccountKeyFile)
+		}
+		ok, err := askToConfirm(cmd, confirmString)
+		if err != nil {
+			return err
+		}
+		if !ok {
+			cmd.Println("The destruction of the IAM configuration was aborted")
+			return nil
+		}
+	}
+
+	if gcpFileExists {
+		c.log.Debugf("Starting to delete %q", constants.GCPServiceAccountKeyFile)
+		proceed, err := c.deleteGCPServiceAccountKeyFile(cmd, destroyer, fsHandler)
+		if err != nil {
+			return err
+		}
+		if !proceed {
+			cmd.Println("Destruction was aborted")
+			return nil
+		}
+	}
+
+	c.log.Debugf("Starting to destroy IAM configuration")
+
+	spinner.Start("Destroying IAM configuration", false)
+	defer spinner.Stop()
+	if err := destroyer.DestroyIAMConfiguration(cmd.Context()); err != nil {
+		return fmt.Errorf("destroying IAM configuration: %w", err)
+	}
+
+	spinner.Stop() // stop the spinner to print a new line
+	fmt.Println("Successfully destroyed IAM configuration")
+	return nil
+}
+
+func (c *destroyCmd) deleteGCPServiceAccountKeyFile(cmd *cobra.Command, destroyer iamDestroyer, fsHandler file.Handler) (bool, error) {
+	var fileSaKey gcpshared.ServiceAccountKey
+
+	c.log.Debugf("Parsing %q", constants.GCPServiceAccountKeyFile)
+	if err := fsHandler.ReadJSON(constants.GCPServiceAccountKeyFile, &fileSaKey); err != nil {
+		return false, err
+	}
+
+	c.log.Debugf("Getting service account key from the tfstate")
+	tfSaKey, err := destroyer.GetTfstateServiceAccountKey(cmd.Context())
+	if err != nil {
+		return false, err
+	}
+
+	c.log.Debugf("Checking if keys are the same")
+	if tfSaKey != fileSaKey {
+		cmd.Printf("The key in %q don't match up with your terraform state. %q will not be deleted.\n", constants.GCPServiceAccountKeyFile, constants.GCPServiceAccountKeyFile)
+		return true, nil
+	}
+
+	if err := fsHandler.Remove(constants.GCPServiceAccountKeyFile); err != nil {
+		return false, err
+	}
+
+	c.log.Debugf("Successfully deleted %q", constants.GCPServiceAccountKeyFile)
+	return true, nil
+}

cli/internal/cmd/iamdestroy_test.go

@@ -0,0 +1,211 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+package cmd
+
+import (
+	"bytes"
+	"errors"
+	"testing"
+
+	"github.com/edgelesssys/constellation/v2/internal/cloud/gcpshared"
+	"github.com/edgelesssys/constellation/v2/internal/constants"
+	"github.com/edgelesssys/constellation/v2/internal/file"
+	"github.com/edgelesssys/constellation/v2/internal/logger"
+	"github.com/spf13/afero"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestIAMDestroy(t *testing.T) {
+	require := require.New(t)
+	someError := errors.New("failed")
+
+	newFsExists := func() file.Handler {
+		fh := file.NewHandler(afero.NewMemMapFs())
+		require.NoError(fh.Write(constants.GCPServiceAccountKeyFile, []byte("{}")))
+		return fh
+	}
+	newFsMissing := func() file.Handler {
+		fh := file.NewHandler(afero.NewMemMapFs())
+		return fh
+	}
+	newFsWithAdminConf := func() file.Handler {
+		fh := file.NewHandler(afero.NewMemMapFs())
+		require.NoError(fh.Write(constants.AdminConfFilename, []byte("")))
+		return fh
+	}
+	newFsWithClusterIDFile := func() file.Handler {
+		fh := file.NewHandler(afero.NewMemMapFs())
+		require.NoError(fh.Write(constants.ClusterIDsFileName, []byte("")))
+		return fh
+	}
+
+	testCases := map[string]struct {
+		iamDestroyer      *stubIAMDestroyer
+		fh                file.Handler
+		stdin             string
+		yesFlag           string
+		wantErr           bool
+		wantDestroyCalled bool
+	}{
+		"cluster running admin conf": {
+			fh:           newFsWithAdminConf(),
+			iamDestroyer: &stubIAMDestroyer{},
+			yesFlag:      "false",
+			wantErr:      true,
+		},
+		"cluster running cluster ids": {
+			fh:           newFsWithClusterIDFile(),
+			iamDestroyer: &stubIAMDestroyer{},
+			yesFlag:      "false",
+			wantErr:      true,
+		},
+		"file missing abort": {
+			fh:           newFsMissing(),
+			stdin:        "n\n",
+			yesFlag:      "false",
+			iamDestroyer: &stubIAMDestroyer{},
+		},
+		"file missing": {
+			fh:                newFsMissing(),
+			stdin:             "y\n",
+			yesFlag:           "false",
+			iamDestroyer:      &stubIAMDestroyer{},
+			wantDestroyCalled: true,
+		},
+		"file exists abort": {
+			fh:           newFsExists(),
+			stdin:        "n\n",
+			yesFlag:      "false",
+			iamDestroyer: &stubIAMDestroyer{},
+		},
+		"error destroying user": {
+			fh:                newFsMissing(),
+			stdin:             "y\n",
+			yesFlag:           "false",
+			iamDestroyer:      &stubIAMDestroyer{destroyErr: someError},
+			wantErr:           true,
+			wantDestroyCalled: true,
+		},
+		"gcp delete error": {
+			fh:           newFsExists(),
+			yesFlag:      "true",
+			iamDestroyer: &stubIAMDestroyer{getTfstateKeyErr: someError},
+			wantErr:      true,
+		},
+	}
+
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			assert := assert.New(t)
+
+			cmd := newIAMDestroyCmd()
+			cmd.SetOut(&bytes.Buffer{})
+			cmd.SetErr(&bytes.Buffer{})
+			cmd.SetIn(bytes.NewBufferString(tc.stdin))
+			assert.NoError(cmd.Flags().Set("yes", tc.yesFlag))
+
+			c := &destroyCmd{log: logger.NewTest(t)}
+
+			err := c.iamDestroy(cmd, &nopSpinner{}, tc.iamDestroyer, tc.fh)
+
+			if tc.wantErr {
+				assert.Error(err)
+			} else {
+				assert.NoError(err)
+			}
+			assert.Equal(tc.wantDestroyCalled, tc.iamDestroyer.destroyCalled)
+		})
+	}
+}
+
+func TestDeleteGCPServiceAccountKeyFile(t *testing.T) {
+	require := require.New(t)
+	someError := errors.New("failed")
+
+	gcpFile := `
+	{
+		"auth_provider_x509_cert_url": "",
+		"auth_uri": "",
+		"client_email": "",
+		"client_id": "",
+		"client_x509_cert_url": "",
+		"private_key": "",
+		"private_key_id": "",
+		"project_id": "",
+		"token_uri": "",
+		"type": ""
+	}
+	`
+
+	newFs := func() file.Handler {
+		fs := file.NewHandler(afero.NewMemMapFs())
+		require.NoError(fs.Write(constants.GCPServiceAccountKeyFile, []byte(gcpFile)))
+		return fs
+	}
+	newFsInvalidJSON := func() file.Handler {
+		fh := file.NewHandler(afero.NewMemMapFs())
+		require.NoError(fh.Write(constants.GCPServiceAccountKeyFile, []byte("asdf")))
+		return fh
+	}
+
+	testCases := map[string]struct {
+		destroyer          *stubIAMDestroyer
+		fsHandler          file.Handler
+		stdin              string
+		wantErr            bool
+		wantProceed        bool
+		wantGetSaKeyCalled bool
+	}{
+		"invalid gcp json": {
+			destroyer: &stubIAMDestroyer{},
+			fsHandler: newFsInvalidJSON(),
+			wantErr:   true,
+		},
+		"error getting key terraform": {
+			destroyer:          &stubIAMDestroyer{getTfstateKeyErr: someError},
+			fsHandler:          newFs(),
+			wantErr:            true,
+			wantGetSaKeyCalled: true,
+		},
+		"keys not same": {
+			destroyer: &stubIAMDestroyer{gcpSaKey: gcpshared.ServiceAccountKey{
+				Type: "somethingelse",
+			}},
+			fsHandler:          newFs(),
+			wantGetSaKeyCalled: true,
+			wantProceed:        true,
+		},
+		"valid": {
+			destroyer:          &stubIAMDestroyer{},
+			fsHandler:          newFs(),
+			wantGetSaKeyCalled: true,
+			wantProceed:        true,
+		},
+	}
+
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			assert := assert.New(t)
+
+			cmd := newIAMDestroyCmd()
+			cmd.SetOut(&bytes.Buffer{})
+			cmd.SetErr(&bytes.Buffer{})
+			cmd.SetIn(bytes.NewBufferString(tc.stdin))
+
+			c := &destroyCmd{log: logger.NewTest(t)}
+
+			proceed, err := c.deleteGCPServiceAccountKeyFile(cmd, tc.destroyer, tc.fsHandler)
+			if tc.wantErr {
+				assert.Error(err)
+			} else {
+				assert.NoError(err)
+			}
+
+			assert.Equal(tc.wantProceed, proceed)
+			assert.Equal(tc.wantGetSaKeyCalled, tc.destroyer.getTfstateKeyCalled)
+		})
+	}
+}

cli/internal/terraform/terraform.go

@@ -68,6 +68,11 @@ func New(ctx context.Context, workingDir string) (*Client, error) {
 	}, nil
 }
 
+// Show reads the default state path and outputs the state.
+func (c *Client) Show(ctx context.Context) (*tfjson.State, error) {
+	return c.tf.Show(ctx)
+}
+
 // PrepareWorkspace prepares a Terraform workspace for a Constellation cluster.
 func (c *Client) PrepareWorkspace(path string, vars Variables) error {
 	if err := prepareWorkspace(path, c.file, c.workingDir); err != nil {

docs/docs/workflows/config.md

@@ -256,14 +256,7 @@ You can keep created IAM configurations and reuse them for new clusters. Alterna
 * [Terraform](https://developer.hashicorp.com/terraform/downloads) is installed on your machine.
 * Access to the `terraform.tfstate` file created by the `constellation iam create` command.
 
-You can delete the IAM configuration using the following commands:
+You can delete the IAM configuration by executing the following command in the same directory where you executed `constellation iam create`:
 ```bash
-# Navigate to the directory containing the terraform.tfstate file
-cd constellation-iam-terraform
-# Destroy the IAM configuration via Terraform
-terraform destroy
-# Confirm deletion by typing "yes"
-# Remove the Terraform state directory
-cd ..
-rm -rf constellation-iam-terraform
+constellation iam destroy
 ```