open-vault/builtin/credential/cert/backend_test.go

package cert

import (
	"crypto/tls"
	"fmt"
	"io/ioutil"
	"reflect"
	"testing"
	"time"

	"github.com/hashicorp/go-rootcerts"
	"github.com/hashicorp/vault/logical"
	"github.com/hashicorp/vault/logical/framework"
	logicaltest "github.com/hashicorp/vault/logical/testing"
	"github.com/mitchellh/mapstructure"
)

const (
	serverCertPath = "test-fixtures/cacert.pem"
	serverKeyPath  = "test-fixtures/cakey.pem"
	serverCAPath   = serverCertPath

	testRootCACertPath1 = "test-fixtures/testcacert1.pem"
	testRootCAKeyPath1  = "test-fixtures/testcakey1.pem"
	testCertPath1       = "test-fixtures/testissuedcert4.pem"
	testKeyPath1        = "test-fixtures/testissuedkey4.pem"
	testIssuedCertCRL   = "test-fixtures/issuedcertcrl"

	testRootCACertPath2 = "test-fixtures/testcacert2.pem"
	testRootCAKeyPath2  = "test-fixtures/testcakey2.pem"
	testRootCertCRL     = "test-fixtures/cacert2crl"
)

// Unlike testConnState, this method does not use the same 'tls.Config' objects for
// both dialing and listening. Instead, it runs the server without specifying its CA.
// But the client, presents the CA cert of the server to trust the server.
// The client can present a cert and key which is completely independent of server's CA.
// The connection state returned will contain the certificate presented by the client.
func connectionState(t *testing.T, serverCAPath, serverCertPath, serverKeyPath, clientCertPath, clientKeyPath string) tls.ConnectionState {
	serverKeyPair, err := tls.LoadX509KeyPair(serverCertPath, serverKeyPath)
	if err != nil {
		t.Fatal(err)
	}
	// Prepare the listener configuration with server's key pair
	listenConf := &tls.Config{
		Certificates: []tls.Certificate{serverKeyPair},
		ClientAuth:   tls.RequestClientCert,
	}

	clientKeyPair, err := tls.LoadX509KeyPair(clientCertPath, clientKeyPath)
	if err != nil {
		t.Fatal(err)
	}
	// Load the CA cert required by the client to authenticate the server.
	rootConfig := &rootcerts.Config{
		CAFile: serverCAPath,
	}
	serverCAs, err := rootcerts.LoadCACerts(rootConfig)
	if err != nil {
		t.Fatal(err)
	}
	// Prepare the dial configuration that the client uses to establish the connection.
	dialConf := &tls.Config{
		Certificates: []tls.Certificate{clientKeyPair},
		RootCAs:      serverCAs,
	}

	// Start the server.
	list, err := tls.Listen("tcp", "127.0.0.1:0", listenConf)
	if err != nil {
		t.Fatal(err)
	}
	defer list.Close()

	// Establish a connection from the client side and write a few bytes.
	go func() {
		addr := list.Addr().String()
		conn, err := tls.Dial("tcp", addr, dialConf)
		if err != nil {
			t.Fatalf("err: %v", err)
		}
		defer conn.Close()

		// Write ping
		conn.Write([]byte("ping"))
	}()

	// Accept the connection on the server side.
	serverConn, err := list.Accept()
	if err != nil {
		t.Fatal(err)
	}
	defer serverConn.Close()

	// Read the ping
	buf := make([]byte, 4)
	serverConn.Read(buf)

	// Grab the current state
	connState := serverConn.(*tls.Conn).ConnectionState()
	return connState
}

func TestBackend_RegisteredNonCA_CRL(t *testing.T) {
	config := logical.TestBackendConfig()
	storage := &logical.InmemStorage{}
	config.StorageView = storage

	b, err := Factory(config)
	if err != nil {
		t.Fatal(err)
	}

	nonCACert, err := ioutil.ReadFile(testCertPath1)
	if err != nil {
		t.Fatal(err)
	}

	// Register the Non-CA certificate of the client key pair
	certData := map[string]interface{}{
		"certificate":  nonCACert,
		"policies":     "abc",
		"display_name": "cert1",
		"ttl":          10000,
	}
	certReq := &logical.Request{
		Operation: logical.UpdateOperation,
		Path:      "certs/cert1",
		Storage:   storage,
		Data:      certData,
	}

	resp, err := b.HandleRequest(certReq)
	if err != nil || (resp != nil && resp.IsError()) {
		t.Fatalf("err:%v resp:%#v", err, resp)
	}

	// Connection state is presenting the client Non-CA cert and its key.
	// This is exactly what is registered at the backend.
	connState := connectionState(t, serverCAPath, serverCertPath, serverKeyPath, testCertPath1, testKeyPath1)
	loginReq := &logical.Request{
		Operation: logical.UpdateOperation,
		Storage:   storage,
		Path:      "login",
		Connection: &logical.Connection{
			ConnState: &connState,
		},
	}
	// Login should succeed.
	resp, err = b.HandleRequest(loginReq)
	if err != nil || (resp != nil && resp.IsError()) {
		t.Fatalf("err:%v resp:%#v", err, resp)
	}

	// Register a CRL containing the issued client certificate used above.
	issuedCRL, err := ioutil.ReadFile(testIssuedCertCRL)
	if err != nil {
		t.Fatal(err)
	}
	crlData := map[string]interface{}{
		"crl": issuedCRL,
	}
	crlReq := &logical.Request{
		Operation: logical.UpdateOperation,
		Storage:   storage,
		Path:      "crls/issuedcrl",
		Data:      crlData,
	}
	resp, err = b.HandleRequest(crlReq)
	if err != nil || (resp != nil && resp.IsError()) {
		t.Fatalf("err:%v resp:%#v", err, resp)
	}

	// Attempt login with the same connection state but with the CRL registered
	resp, err = b.HandleRequest(loginReq)
	if err != nil {
		t.Fatal(err)
	}
	if resp == nil || !resp.IsError() {
		t.Fatalf("expected failure due to revoked certificate")
	}
}

func TestBackend_CRLs(t *testing.T) {
	config := logical.TestBackendConfig()
	storage := &logical.InmemStorage{}
	config.StorageView = storage

	b, err := Factory(config)
	if err != nil {
		t.Fatal(err)
	}

	clientCA1, err := ioutil.ReadFile(testRootCACertPath1)
	if err != nil {
		t.Fatal(err)
	}
	// Register the CA certificate of the client key pair
	certData := map[string]interface{}{
		"certificate":  clientCA1,
		"policies":     "abc",
		"display_name": "cert1",
		"ttl":          10000,
	}

	certReq := &logical.Request{
		Operation: logical.UpdateOperation,
		Path:      "certs/cert1",
		Storage:   storage,
		Data:      certData,
	}

	resp, err := b.HandleRequest(certReq)
	if err != nil || (resp != nil && resp.IsError()) {
		t.Fatalf("err:%v resp:%#v", err, resp)
	}

	// Connection state is presenting the client CA cert and its key.
	// This is exactly what is registered at the backend.
	connState := connectionState(t, serverCAPath, serverCertPath, serverKeyPath, testRootCACertPath1, testRootCAKeyPath1)
	loginReq := &logical.Request{
		Operation: logical.UpdateOperation,
		Storage:   storage,
		Path:      "login",
		Connection: &logical.Connection{
			ConnState: &connState,
		},
	}
	resp, err = b.HandleRequest(loginReq)
	if err != nil || (resp != nil && resp.IsError()) {
		t.Fatalf("err:%v resp:%#v", err, resp)
	}

	// Now, without changing the registered client CA cert, present from
	// the client side, a cert issued using the registered CA.
	connState = connectionState(t, serverCAPath, serverCertPath, serverKeyPath, testCertPath1, testKeyPath1)
	loginReq.Connection.ConnState = &connState

	// Attempt login with the updated connection
	resp, err = b.HandleRequest(loginReq)
	if err != nil || (resp != nil && resp.IsError()) {
		t.Fatalf("err:%v resp:%#v", err, resp)
	}

	// Register a CRL containing the issued client certificate used above.
	issuedCRL, err := ioutil.ReadFile(testIssuedCertCRL)
	if err != nil {
		t.Fatal(err)
	}
	crlData := map[string]interface{}{
		"crl": issuedCRL,
	}

	crlReq := &logical.Request{
		Operation: logical.UpdateOperation,
		Storage:   storage,
		Path:      "crls/issuedcrl",
		Data:      crlData,
	}
	resp, err = b.HandleRequest(crlReq)
	if err != nil || (resp != nil && resp.IsError()) {
		t.Fatalf("err:%v resp:%#v", err, resp)
	}

	// Attempt login with the revoked certificate.
	resp, err = b.HandleRequest(loginReq)
	if err != nil {
		t.Fatal(err)
	}
	if resp == nil || !resp.IsError() {
		t.Fatalf("expected failure due to revoked certificate")
	}

	// Register a different client CA certificate.
	clientCA2, err := ioutil.ReadFile(testRootCACertPath2)
	if err != nil {
		t.Fatal(err)
	}
	certData["certificate"] = clientCA2
	resp, err = b.HandleRequest(certReq)
	if err != nil || (resp != nil && resp.IsError()) {
		t.Fatalf("err:%v resp:%#v", err, resp)
	}

	// Test login using a different client CA cert pair.
	connState = connectionState(t, serverCAPath, serverCertPath, serverKeyPath, testRootCACertPath2, testRootCAKeyPath2)
	loginReq.Connection.ConnState = &connState

	// Attempt login with the updated connection
	resp, err = b.HandleRequest(loginReq)
	if err != nil || (resp != nil && resp.IsError()) {
		t.Fatalf("err:%v resp:%#v", err, resp)
	}

	// Register a CRL containing the root CA certificate used above.
	rootCRL, err := ioutil.ReadFile(testRootCertCRL)
	if err != nil {
		t.Fatal(err)
	}
	crlData["crl"] = rootCRL
	resp, err = b.HandleRequest(crlReq)
	if err != nil || (resp != nil && resp.IsError()) {
		t.Fatalf("err:%v resp:%#v", err, resp)
	}

	// Attempt login with the same connection state but with the CRL registered
	resp, err = b.HandleRequest(loginReq)
	if err != nil {
		t.Fatal(err)
	}
	if resp == nil || !resp.IsError() {
		t.Fatalf("expected failure due to revoked certificate")
	}
}

func testFactory(t *testing.T) logical.Backend {
	b, err := Factory(&logical.BackendConfig{
		System: &logical.StaticSystemView{
			DefaultLeaseTTLVal: 300 * time.Second,
			MaxLeaseTTLVal:     1800 * time.Second,
		},
		StorageView: &logical.InmemStorage{},
	})
	if err != nil {
		t.Fatalf("error: %s", err)
	}
	return b
}

// Test the certificates being registered to the backend
func TestBackend_CertWrites(t *testing.T) {
	// CA cert
	ca1, err := ioutil.ReadFile("test-fixtures/root/rootcacert.pem")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	// Non CA Cert
	ca2, err := ioutil.ReadFile("test-fixtures/keys/cert.pem")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	// Non CA cert without TLS web client authentication
	ca3, err := ioutil.ReadFile("test-fixtures/noclientauthcert.pem")
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	tc := logicaltest.TestCase{
		Backend: testFactory(t),
		Steps: []logicaltest.TestStep{
			testAccStepCert(t, "aaa", ca1, "foo", false),
			testAccStepCert(t, "bbb", ca2, "foo", false),
			testAccStepCert(t, "ccc", ca3, "foo", true),
		},
	}
	tc.Steps = append(tc.Steps, testAccStepListCerts(t, []string{"aaa", "bbb"})...)
	logicaltest.Test(t, tc)
}

// Test a client trusted by a CA
func TestBackend_basic_CA(t *testing.T) {
	connState := testConnState(t, "test-fixtures/keys/cert.pem",
		"test-fixtures/keys/key.pem", "test-fixtures/root/rootcacert.pem")
	ca, err := ioutil.ReadFile("test-fixtures/root/rootcacert.pem")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	logicaltest.Test(t, logicaltest.TestCase{
		Backend: testFactory(t),
		Steps: []logicaltest.TestStep{
			testAccStepCert(t, "web", ca, "foo", false),
			testAccStepLogin(t, connState),
			testAccStepCertLease(t, "web", ca, "foo"),
			testAccStepCertTTL(t, "web", ca, "foo"),
			testAccStepLogin(t, connState),
			testAccStepCertNoLease(t, "web", ca, "foo"),
			testAccStepLoginDefaultLease(t, connState),
		},
	})
}

// Test CRL behavior
func TestBackend_Basic_CRLs(t *testing.T) {
	connState := testConnState(t, "test-fixtures/keys/cert.pem",
		"test-fixtures/keys/key.pem", "test-fixtures/root/rootcacert.pem")
	ca, err := ioutil.ReadFile("test-fixtures/root/rootcacert.pem")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	crl, err := ioutil.ReadFile("test-fixtures/root/root.crl")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	logicaltest.Test(t, logicaltest.TestCase{
		Backend: testFactory(t),
		Steps: []logicaltest.TestStep{
			testAccStepCertNoLease(t, "web", ca, "foo"),
			testAccStepLoginDefaultLease(t, connState),
			testAccStepAddCRL(t, crl, connState),
			testAccStepReadCRL(t, connState),
			testAccStepLoginInvalid(t, connState),
			testAccStepDeleteCRL(t, connState),
			testAccStepLoginDefaultLease(t, connState),
		},
	})
}

// Test a self-signed client that is trusted
func TestBackend_basic_singleCert(t *testing.T) {
	connState := testConnState(t, "test-fixtures/keys/cert.pem",
		"test-fixtures/keys/key.pem", "test-fixtures/root/rootcacert.pem")
	ca, err := ioutil.ReadFile("test-fixtures/root/rootcacert.pem")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	logicaltest.Test(t, logicaltest.TestCase{
		Backend: testFactory(t),
		Steps: []logicaltest.TestStep{
			testAccStepCert(t, "web", ca, "foo", false),
			testAccStepLogin(t, connState),
		},
	})
}

// Test an untrusted self-signed client
func TestBackend_untrusted(t *testing.T) {
	connState := testConnState(t, "test-fixtures/keys/cert.pem",
		"test-fixtures/keys/key.pem", "test-fixtures/root/rootcacert.pem")
	logicaltest.Test(t, logicaltest.TestCase{
		Backend: testFactory(t),
		Steps: []logicaltest.TestStep{
			testAccStepLoginInvalid(t, connState),
		},
	})
}

func testAccStepAddCRL(t *testing.T, crl []byte, connState tls.ConnectionState) logicaltest.TestStep {
	return logicaltest.TestStep{
		Operation: logical.UpdateOperation,
		Path:      "crls/test",
		ConnState: &connState,
		Data: map[string]interface{}{
			"crl": crl,
		},
	}
}

func testAccStepReadCRL(t *testing.T, connState tls.ConnectionState) logicaltest.TestStep {
	return logicaltest.TestStep{
		Operation: logical.ReadOperation,
		Path:      "crls/test",
		ConnState: &connState,
		Check: func(resp *logical.Response) error {
			crlInfo := CRLInfo{}
			err := mapstructure.Decode(resp.Data, &crlInfo)
			if err != nil {
				t.Fatalf("err: %v", err)
			}
			if len(crlInfo.Serials) != 1 {
				t.Fatalf("bad: expected CRL with length 1, got %d", len(crlInfo.Serials))
			}
			if _, ok := crlInfo.Serials["637101449987587619778072672905061040630001617053"]; !ok {
				t.Fatalf("bad: expected serial number not found in CRL")
			}
			return nil
		},
	}
}

func testAccStepDeleteCRL(t *testing.T, connState tls.ConnectionState) logicaltest.TestStep {
	return logicaltest.TestStep{
		Operation: logical.DeleteOperation,
		Path:      "crls/test",
		ConnState: &connState,
	}
}

func testAccStepLogin(t *testing.T, connState tls.ConnectionState) logicaltest.TestStep {
	return logicaltest.TestStep{
		Operation:       logical.UpdateOperation,
		Path:            "login",
		Unauthenticated: true,
		ConnState:       &connState,
		Check: func(resp *logical.Response) error {
			if resp.Auth.TTL != 1000*time.Second {
				t.Fatalf("bad lease length: %#v", resp.Auth)
			}

			fn := logicaltest.TestCheckAuth([]string{"default", "foo"})
			return fn(resp)
		},
	}
}

func testAccStepLoginDefaultLease(t *testing.T, connState tls.ConnectionState) logicaltest.TestStep {
	return logicaltest.TestStep{
		Operation:       logical.UpdateOperation,
		Path:            "login",
		Unauthenticated: true,
		ConnState:       &connState,
		Check: func(resp *logical.Response) error {
			if resp.Auth.TTL != 300*time.Second {
				t.Fatalf("bad lease length: %#v", resp.Auth)
			}

			fn := logicaltest.TestCheckAuth([]string{"default", "foo"})
			return fn(resp)
		},
	}
}

func testAccStepLoginInvalid(t *testing.T, connState tls.ConnectionState) logicaltest.TestStep {
	return logicaltest.TestStep{
		Operation:       logical.UpdateOperation,
		Path:            "login",
		Unauthenticated: true,
		ConnState:       &connState,
		Check: func(resp *logical.Response) error {
			if resp.Auth != nil {
				return fmt.Errorf("should not be authorized: %#v", resp)
			}
			return nil
		},
		ErrorOk: true,
	}
}

func testAccStepListCerts(
	t *testing.T, certs []string) []logicaltest.TestStep {
	return []logicaltest.TestStep{
		logicaltest.TestStep{
			Operation: logical.ListOperation,
			Path:      "certs",
			Check: func(resp *logical.Response) error {
				if resp == nil {
					return fmt.Errorf("nil response")
				}
				if resp.Data == nil {
					return fmt.Errorf("nil data")
				}
				if resp.Data["keys"] == interface{}(nil) {
					return fmt.Errorf("nil keys")
				}
				keys := resp.Data["keys"].([]string)
				if !reflect.DeepEqual(keys, certs) {
					return fmt.Errorf("mismatch: keys is %#v, certs is %#v", keys, certs)
				}
				return nil
			},
		}, logicaltest.TestStep{
			Operation: logical.ListOperation,
			Path:      "certs/",
			Check: func(resp *logical.Response) error {
				if resp == nil {
					return fmt.Errorf("nil response")
				}
				if resp.Data == nil {
					return fmt.Errorf("nil data")
				}
				if resp.Data["keys"] == interface{}(nil) {
					return fmt.Errorf("nil keys")
				}
				keys := resp.Data["keys"].([]string)
				if !reflect.DeepEqual(keys, certs) {
					return fmt.Errorf("mismatch: keys is %#v, certs is %#v", keys, certs)
				}

				return nil
			},
		},
	}
}

func testAccStepCert(
	t *testing.T, name string, cert []byte, policies string, expectError bool) logicaltest.TestStep {
	return logicaltest.TestStep{
		Operation: logical.UpdateOperation,
		Path:      "certs/" + name,
		ErrorOk:   expectError,
		Data: map[string]interface{}{
			"certificate":  string(cert),
			"policies":     policies,
			"display_name": name,
			"lease":        1000,
		},
		Check: func(resp *logical.Response) error {
			if resp == nil && expectError {
				return fmt.Errorf("expected error but received nil")
			}
			return nil
		},
	}
}

func testAccStepCertLease(
	t *testing.T, name string, cert []byte, policies string) logicaltest.TestStep {
	return logicaltest.TestStep{
		Operation: logical.UpdateOperation,
		Path:      "certs/" + name,
		Data: map[string]interface{}{
			"certificate":  string(cert),
			"policies":     policies,
			"display_name": name,
			"lease":        1000,
		},
	}
}

func testAccStepCertTTL(
	t *testing.T, name string, cert []byte, policies string) logicaltest.TestStep {
	return logicaltest.TestStep{
		Operation: logical.UpdateOperation,
		Path:      "certs/" + name,
		Data: map[string]interface{}{
			"certificate":  string(cert),
			"policies":     policies,
			"display_name": name,
			"ttl":          "1000s",
		},
	}
}

func testAccStepCertNoLease(
	t *testing.T, name string, cert []byte, policies string) logicaltest.TestStep {
	return logicaltest.TestStep{
		Operation: logical.UpdateOperation,
		Path:      "certs/" + name,
		Data: map[string]interface{}{
			"certificate":  string(cert),
			"policies":     policies,
			"display_name": name,
		},
	}
}

func testConnState(t *testing.T, certPath, keyPath, rootCertPath string) tls.ConnectionState {
	cert, err := tls.LoadX509KeyPair(certPath, keyPath)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	rootConfig := &rootcerts.Config{
		CAFile: rootCertPath,
	}
	rootCAs, err := rootcerts.LoadCACerts(rootConfig)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	listenConf := &tls.Config{
		Certificates:       []tls.Certificate{cert},
		ClientAuth:         tls.RequestClientCert,
		InsecureSkipVerify: false,
		RootCAs:            rootCAs,
	}
	dialConf := new(tls.Config)
	*dialConf = *listenConf
	list, err := tls.Listen("tcp", "127.0.0.1:0", listenConf)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	defer list.Close()

	go func() {
		addr := list.Addr().String()
		conn, err := tls.Dial("tcp", addr, dialConf)
		if err != nil {
			t.Fatalf("err: %v", err)
		}
		defer conn.Close()

		// Write ping
		conn.Write([]byte("ping"))
	}()

	serverConn, err := list.Accept()
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	defer serverConn.Close()

	// Read the pign
	buf := make([]byte, 4)
	serverConn.Read(buf)

	// Grab the current state
	connState := serverConn.(*tls.Conn).ConnectionState()
	return connState
}

func Test_Renew(t *testing.T) {
	storage := &logical.InmemStorage{}

	lb, err := Factory(&logical.BackendConfig{
		System: &logical.StaticSystemView{
			DefaultLeaseTTLVal: 300 * time.Second,
			MaxLeaseTTLVal:     1800 * time.Second,
		},
		StorageView: storage,
	})
	if err != nil {
		t.Fatal("error: %s", err)
	}

	b := lb.(*backend)
	connState := testConnState(t, "test-fixtures/keys/cert.pem",
		"test-fixtures/keys/key.pem", "test-fixtures/root/rootcacert.pem")
	ca, err := ioutil.ReadFile("test-fixtures/root/rootcacert.pem")
	if err != nil {
		t.Fatal(err)
	}

	req := &logical.Request{
		Connection: &logical.Connection{
			ConnState: &connState,
		},
		Storage: storage,
		Auth:    &logical.Auth{},
	}

	fd := &framework.FieldData{
		Raw: map[string]interface{}{
			"name":        "test",
			"certificate": ca,
			"policies":    "foo,bar",
		},
		Schema: pathCerts(b).Fields,
	}

	resp, err := b.pathCertWrite(req, fd)
	if err != nil {
		t.Fatal(err)
	}

	resp, err = b.pathLogin(req, nil)
	if err != nil {
		t.Fatal(err)
	}
	req.Auth.InternalData = resp.Auth.InternalData
	req.Auth.Metadata = resp.Auth.Metadata
	req.Auth.LeaseOptions = resp.Auth.LeaseOptions
	req.Auth.Policies = resp.Auth.Policies
	req.Auth.IssueTime = time.Now()

	// Normal renewal
	resp, err = b.pathLoginRenew(req, nil)
	if err != nil {
		t.Fatal(err)
	}
	if resp == nil {
		t.Fatal("got nil response from renew")
	}
	if resp.IsError() {
		t.Fatalf("got error: %#v", *resp)
	}

	// Change the policies -- this should fail
	fd.Raw["policies"] = "zip,zap"
	resp, err = b.pathCertWrite(req, fd)
	if err != nil {
		t.Fatal(err)
	}

	resp, err = b.pathLoginRenew(req, nil)
	if err == nil {
		t.Fatal("expected error")
	}

	// Put the policies back, this shold be okay
	fd.Raw["policies"] = "bar,foo"
	resp, err = b.pathCertWrite(req, fd)
	if err != nil {
		t.Fatal(err)
	}

	resp, err = b.pathLoginRenew(req, nil)
	if err != nil {
		t.Fatal(err)
	}
	if resp == nil {
		t.Fatal("got nil response from renew")
	}
	if resp.IsError() {
		t.Fatal("got error: %#v", *resp)
	}

	// Delete CA, make sure we can't renew
	resp, err = b.pathCertDelete(req, fd)
	if err != nil {
		t.Fatal(err)
	}

	resp, err = b.pathLoginRenew(req, nil)
	if err != nil {
		t.Fatal(err)
	}
	if resp == nil {
		t.Fatal("got nil response from renew")
	}
	if !resp.IsError() {
		t.Fatal("expected error")
	}
}