Add generated file

This PR adds generated files under pkg/client and vendor folder.

vendor/k8s.io/client-go/plugin/pkg/client/auth/exec/exec.go

@@ -0,0 +1,370 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package exec
+
+import (
+	"bytes"
+	"context"
+	"crypto/tls"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"os"
+	"os/exec"
+	"reflect"
+	"sync"
+	"time"
+
+	"github.com/golang/glog"
+	"golang.org/x/crypto/ssh/terminal"
+	"k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/runtime/serializer"
+	"k8s.io/client-go/pkg/apis/clientauthentication"
+	"k8s.io/client-go/pkg/apis/clientauthentication/v1alpha1"
+	"k8s.io/client-go/pkg/apis/clientauthentication/v1beta1"
+	"k8s.io/client-go/tools/clientcmd/api"
+	"k8s.io/client-go/transport"
+	"k8s.io/client-go/util/connrotation"
+)
+
+const execInfoEnv = "KUBERNETES_EXEC_INFO"
+
+var scheme = runtime.NewScheme()
+var codecs = serializer.NewCodecFactory(scheme)
+
+func init() {
+	v1.AddToGroupVersion(scheme, schema.GroupVersion{Version: "v1"})
+	v1alpha1.AddToScheme(scheme)
+	v1beta1.AddToScheme(scheme)
+	clientauthentication.AddToScheme(scheme)
+}
+
+var (
+	// Since transports can be constantly re-initialized by programs like kubectl,
+	// keep a cache of initialized authenticators keyed by a hash of their config.
+	globalCache = newCache()
+	// The list of API versions we accept.
+	apiVersions = map[string]schema.GroupVersion{
+		v1alpha1.SchemeGroupVersion.String(): v1alpha1.SchemeGroupVersion,
+		v1beta1.SchemeGroupVersion.String():  v1beta1.SchemeGroupVersion,
+	}
+)
+
+func newCache() *cache {
+	return &cache{m: make(map[string]*Authenticator)}
+}
+
+func cacheKey(c *api.ExecConfig) string {
+	return fmt.Sprintf("%#v", c)
+}
+
+type cache struct {
+	mu sync.Mutex
+	m  map[string]*Authenticator
+}
+
+func (c *cache) get(s string) (*Authenticator, bool) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	a, ok := c.m[s]
+	return a, ok
+}
+
+// put inserts an authenticator into the cache. If an authenticator is already
+// associated with the key, the first one is returned instead.
+func (c *cache) put(s string, a *Authenticator) *Authenticator {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	existing, ok := c.m[s]
+	if ok {
+		return existing
+	}
+	c.m[s] = a
+	return a
+}
+
+// GetAuthenticator returns an exec-based plugin for providing client credentials.
+func GetAuthenticator(config *api.ExecConfig) (*Authenticator, error) {
+	return newAuthenticator(globalCache, config)
+}
+
+func newAuthenticator(c *cache, config *api.ExecConfig) (*Authenticator, error) {
+	key := cacheKey(config)
+	if a, ok := c.get(key); ok {
+		return a, nil
+	}
+
+	gv, ok := apiVersions[config.APIVersion]
+	if !ok {
+		return nil, fmt.Errorf("exec plugin: invalid apiVersion %q", config.APIVersion)
+	}
+
+	a := &Authenticator{
+		cmd:   config.Command,
+		args:  config.Args,
+		group: gv,
+
+		stdin:       os.Stdin,
+		stderr:      os.Stderr,
+		interactive: terminal.IsTerminal(int(os.Stdout.Fd())),
+		now:         time.Now,
+		environ:     os.Environ,
+	}
+
+	for _, env := range config.Env {
+		a.env = append(a.env, env.Name+"="+env.Value)
+	}
+
+	return c.put(key, a), nil
+}
+
+// Authenticator is a client credential provider that rotates credentials by executing a plugin.
+// The plugin input and output are defined by the API group client.authentication.k8s.io.
+type Authenticator struct {
+	// Set by the config
+	cmd   string
+	args  []string
+	group schema.GroupVersion
+	env   []string
+
+	// Stubbable for testing
+	stdin       io.Reader
+	stderr      io.Writer
+	interactive bool
+	now         func() time.Time
+	environ     func() []string
+
+	// Cached results.
+	//
+	// The mutex also guards calling the plugin. Since the plugin could be
+	// interactive we want to make sure it's only called once.
+	mu          sync.Mutex
+	cachedCreds *credentials
+	exp         time.Time
+
+	onRotate func()
+}
+
+type credentials struct {
+	token string
+	cert  *tls.Certificate
+}
+
+// UpdateTransportConfig updates the transport.Config to use credentials
+// returned by the plugin.
+func (a *Authenticator) UpdateTransportConfig(c *transport.Config) error {
+	wt := c.WrapTransport
+	c.WrapTransport = func(rt http.RoundTripper) http.RoundTripper {
+		if wt != nil {
+			rt = wt(rt)
+		}
+		return &roundTripper{a, rt}
+	}
+
+	getCert := c.TLS.GetCert
+	c.TLS.GetCert = func() (*tls.Certificate, error) {
+		// If previous GetCert is present and returns a valid non-nil
+		// certificate, use that. Otherwise use cert from exec plugin.
+		if getCert != nil {
+			cert, err := getCert()
+			if err != nil {
+				return nil, err
+			}
+			if cert != nil {
+				return cert, nil
+			}
+		}
+		return a.cert()
+	}
+
+	var dial func(ctx context.Context, network, addr string) (net.Conn, error)
+	if c.Dial != nil {
+		dial = c.Dial
+	} else {
+		dial = (&net.Dialer{Timeout: 30 * time.Second, KeepAlive: 30 * time.Second}).DialContext
+	}
+	d := connrotation.NewDialer(dial)
+	a.onRotate = d.CloseAll
+	c.Dial = d.DialContext
+
+	return nil
+}
+
+type roundTripper struct {
+	a    *Authenticator
+	base http.RoundTripper
+}
+
+func (r *roundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
+	// If a user has already set credentials, use that. This makes commands like
+	// "kubectl get --token (token) pods" work.
+	if req.Header.Get("Authorization") != "" {
+		return r.base.RoundTrip(req)
+	}
+
+	creds, err := r.a.getCreds()
+	if err != nil {
+		return nil, fmt.Errorf("getting credentials: %v", err)
+	}
+	if creds.token != "" {
+		req.Header.Set("Authorization", "Bearer "+creds.token)
+	}
+
+	res, err := r.base.RoundTrip(req)
+	if err != nil {
+		return nil, err
+	}
+	if res.StatusCode == http.StatusUnauthorized {
+		resp := &clientauthentication.Response{
+			Header: res.Header,
+			Code:   int32(res.StatusCode),
+		}
+		if err := r.a.maybeRefreshCreds(creds, resp); err != nil {
+			glog.Errorf("refreshing credentials: %v", err)
+		}
+	}
+	return res, nil
+}
+
+func (a *Authenticator) credsExpired() bool {
+	if a.exp.IsZero() {
+		return false
+	}
+	return a.now().After(a.exp)
+}
+
+func (a *Authenticator) cert() (*tls.Certificate, error) {
+	creds, err := a.getCreds()
+	if err != nil {
+		return nil, err
+	}
+	return creds.cert, nil
+}
+
+func (a *Authenticator) getCreds() (*credentials, error) {
+	a.mu.Lock()
+	defer a.mu.Unlock()
+	if a.cachedCreds != nil && !a.credsExpired() {
+		return a.cachedCreds, nil
+	}
+
+	if err := a.refreshCredsLocked(nil); err != nil {
+		return nil, err
+	}
+	return a.cachedCreds, nil
+}
+
+// maybeRefreshCreds executes the plugin to force a rotation of the
+// credentials, unless they were rotated already.
+func (a *Authenticator) maybeRefreshCreds(creds *credentials, r *clientauthentication.Response) error {
+	a.mu.Lock()
+	defer a.mu.Unlock()
+
+	// Since we're not making a new pointer to a.cachedCreds in getCreds, no
+	// need to do deep comparison.
+	if creds != a.cachedCreds {
+		// Credentials already rotated.
+		return nil
+	}
+
+	return a.refreshCredsLocked(r)
+}
+
+// refreshCredsLocked executes the plugin and reads the credentials from
+// stdout. It must be called while holding the Authenticator's mutex.
+func (a *Authenticator) refreshCredsLocked(r *clientauthentication.Response) error {
+	cred := &clientauthentication.ExecCredential{
+		Spec: clientauthentication.ExecCredentialSpec{
+			Response:    r,
+			Interactive: a.interactive,
+		},
+	}
+
+	env := append(a.environ(), a.env...)
+	if a.group == v1alpha1.SchemeGroupVersion {
+		// Input spec disabled for beta due to lack of use. Possibly re-enable this later if
+		// someone wants it back.
+		//
+		// See: https://github.com/kubernetes/kubernetes/issues/61796
+		data, err := runtime.Encode(codecs.LegacyCodec(a.group), cred)
+		if err != nil {
+			return fmt.Errorf("encode ExecCredentials: %v", err)
+		}
+		env = append(env, fmt.Sprintf("%s=%s", execInfoEnv, data))
+	}
+
+	stdout := &bytes.Buffer{}
+	cmd := exec.Command(a.cmd, a.args...)
+	cmd.Env = env
+	cmd.Stderr = a.stderr
+	cmd.Stdout = stdout
+	if a.interactive {
+		cmd.Stdin = a.stdin
+	}
+
+	if err := cmd.Run(); err != nil {
+		return fmt.Errorf("exec: %v", err)
+	}
+
+	_, gvk, err := codecs.UniversalDecoder(a.group).Decode(stdout.Bytes(), nil, cred)
+	if err != nil {
+		return fmt.Errorf("decoding stdout: %v", err)
+	}
+	if gvk.Group != a.group.Group || gvk.Version != a.group.Version {
+		return fmt.Errorf("exec plugin is configured to use API version %s, plugin returned version %s",
+			a.group, schema.GroupVersion{Group: gvk.Group, Version: gvk.Version})
+	}
+
+	if cred.Status == nil {
+		return fmt.Errorf("exec plugin didn't return a status field")
+	}
+	if cred.Status.Token == "" && cred.Status.ClientCertificateData == "" && cred.Status.ClientKeyData == "" {
+		return fmt.Errorf("exec plugin didn't return a token or cert/key pair")
+	}
+	if (cred.Status.ClientCertificateData == "") != (cred.Status.ClientKeyData == "") {
+		return fmt.Errorf("exec plugin returned only certificate or key, not both")
+	}
+
+	if cred.Status.ExpirationTimestamp != nil {
+		a.exp = cred.Status.ExpirationTimestamp.Time
+	} else {
+		a.exp = time.Time{}
+	}
+
+	newCreds := &credentials{
+		token: cred.Status.Token,
+	}
+	if cred.Status.ClientKeyData != "" && cred.Status.ClientCertificateData != "" {
+		cert, err := tls.X509KeyPair([]byte(cred.Status.ClientCertificateData), []byte(cred.Status.ClientKeyData))
+		if err != nil {
+			return fmt.Errorf("failed parsing client key/certificate: %v", err)
+		}
+		newCreds.cert = &cert
+	}
+
+	oldCreds := a.cachedCreds
+	a.cachedCreds = newCreds
+	// Only close all connections when TLS cert rotates. Token rotation doesn't
+	// need the extra noise.
+	if a.onRotate != nil && oldCreds != nil && !reflect.DeepEqual(oldCreds.cert, a.cachedCreds.cert) {
+		a.onRotate()
+	}
+	return nil
+}

vendor/k8s.io/client-go/plugin/pkg/client/auth/exec/exec_test.go

@@ -0,0 +1,748 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package exec
+
+import (
+	"bytes"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/tls"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/json"
+	"encoding/pem"
+	"fmt"
+	"io/ioutil"
+	"math/big"
+	"net/http"
+	"net/http/httptest"
+	"reflect"
+	"strings"
+	"testing"
+	"time"
+
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/client-go/pkg/apis/clientauthentication"
+	"k8s.io/client-go/tools/clientcmd/api"
+	"k8s.io/client-go/transport"
+)
+
+var (
+	certData = []byte(`-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----`)
+	keyData = []byte(`-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----`)
+	validCert *tls.Certificate
+)
+
+func init() {
+	cert, err := tls.X509KeyPair(certData, keyData)
+	if err != nil {
+		panic(err)
+	}
+	validCert = &cert
+}
+
+func TestCacheKey(t *testing.T) {
+	c1 := &api.ExecConfig{
+		Command: "foo-bar",
+		Args:    []string{"1", "2"},
+		Env: []api.ExecEnvVar{
+			{Name: "3", Value: "4"},
+			{Name: "5", Value: "6"},
+			{Name: "7", Value: "8"},
+		},
+		APIVersion: "client.authentication.k8s.io/v1alpha1",
+	}
+	c2 := &api.ExecConfig{
+		Command: "foo-bar",
+		Args:    []string{"1", "2"},
+		Env: []api.ExecEnvVar{
+			{Name: "3", Value: "4"},
+			{Name: "5", Value: "6"},
+			{Name: "7", Value: "8"},
+		},
+		APIVersion: "client.authentication.k8s.io/v1alpha1",
+	}
+	c3 := &api.ExecConfig{
+		Command: "foo-bar",
+		Args:    []string{"1", "2"},
+		Env: []api.ExecEnvVar{
+			{Name: "3", Value: "4"},
+			{Name: "5", Value: "6"},
+		},
+		APIVersion: "client.authentication.k8s.io/v1alpha1",
+	}
+	key1 := cacheKey(c1)
+	key2 := cacheKey(c2)
+	key3 := cacheKey(c3)
+	if key1 != key2 {
+		t.Error("key1 and key2 didn't match")
+	}
+	if key1 == key3 {
+		t.Error("key1 and key3 matched")
+	}
+	if key2 == key3 {
+		t.Error("key2 and key3 matched")
+	}
+}
+
+func compJSON(t *testing.T, got, want []byte) {
+	t.Helper()
+	gotJSON := &bytes.Buffer{}
+	wantJSON := &bytes.Buffer{}
+
+	if err := json.Indent(gotJSON, got, "", "  "); err != nil {
+		t.Errorf("got invalid JSON: %v", err)
+	}
+	if err := json.Indent(wantJSON, want, "", "  "); err != nil {
+		t.Errorf("want invalid JSON: %v", err)
+	}
+	g := strings.TrimSpace(gotJSON.String())
+	w := strings.TrimSpace(wantJSON.String())
+	if g != w {
+		t.Errorf("wanted %q, got %q", w, g)
+	}
+}
+
+func TestRefreshCreds(t *testing.T) {
+	tests := []struct {
+		name        string
+		config      api.ExecConfig
+		output      string
+		interactive bool
+		response    *clientauthentication.Response
+		wantInput   string
+		wantCreds   credentials
+		wantExpiry  time.Time
+		wantErr     bool
+	}{
+		{
+			name: "basic-request",
+			config: api.ExecConfig{
+				APIVersion: "client.authentication.k8s.io/v1alpha1",
+			},
+			wantInput: `{
+				"kind":"ExecCredential",
+				"apiVersion":"client.authentication.k8s.io/v1alpha1",
+				"spec": {}
+			}`,
+			output: `{
+				"kind": "ExecCredential",
+				"apiVersion": "client.authentication.k8s.io/v1alpha1",
+				"status": {
+					"token": "foo-bar"
+				}
+			}`,
+			wantCreds: credentials{token: "foo-bar"},
+		},
+		{
+			name: "interactive",
+			config: api.ExecConfig{
+				APIVersion: "client.authentication.k8s.io/v1alpha1",
+			},
+			interactive: true,
+			wantInput: `{
+				"kind":"ExecCredential",
+				"apiVersion":"client.authentication.k8s.io/v1alpha1",
+				"spec": {
+					"interactive": true
+				}
+			}`,
+			output: `{
+				"kind": "ExecCredential",
+				"apiVersion": "client.authentication.k8s.io/v1alpha1",
+				"status": {
+					"token": "foo-bar"
+				}
+			}`,
+			wantCreds: credentials{token: "foo-bar"},
+		},
+		{
+			name: "response",
+			config: api.ExecConfig{
+				APIVersion: "client.authentication.k8s.io/v1alpha1",
+			},
+			response: &clientauthentication.Response{
+				Header: map[string][]string{
+					"WWW-Authenticate": {`Basic realm="Access to the staging site", charset="UTF-8"`},
+				},
+				Code: 401,
+			},
+			wantInput: `{
+				"kind":"ExecCredential",
+				"apiVersion":"client.authentication.k8s.io/v1alpha1",
+				"spec": {
+					"response": {
+						"header": {
+							"WWW-Authenticate": [
+								"Basic realm=\"Access to the staging site\", charset=\"UTF-8\""
+							]
+						},
+						"code": 401
+					}
+				}
+			}`,
+			output: `{
+				"kind": "ExecCredential",
+				"apiVersion": "client.authentication.k8s.io/v1alpha1",
+				"status": {
+					"token": "foo-bar"
+				}
+			}`,
+			wantCreds: credentials{token: "foo-bar"},
+		},
+		{
+			name: "expiry",
+			config: api.ExecConfig{
+				APIVersion: "client.authentication.k8s.io/v1alpha1",
+			},
+			wantInput: `{
+				"kind":"ExecCredential",
+				"apiVersion":"client.authentication.k8s.io/v1alpha1",
+				"spec": {}
+			}`,
+			output: `{
+				"kind": "ExecCredential",
+				"apiVersion": "client.authentication.k8s.io/v1alpha1",
+				"status": {
+					"token": "foo-bar",
+					"expirationTimestamp": "2006-01-02T15:04:05Z"
+				}
+			}`,
+			wantExpiry: time.Date(2006, 01, 02, 15, 04, 05, 0, time.UTC),
+			wantCreds:  credentials{token: "foo-bar"},
+		},
+		{
+			name: "no-group-version",
+			config: api.ExecConfig{
+				APIVersion: "client.authentication.k8s.io/v1alpha1",
+			},
+			wantInput: `{
+				"kind":"ExecCredential",
+				"apiVersion":"client.authentication.k8s.io/v1alpha1",
+				"spec": {}
+			}`,
+			output: `{
+				"kind": "ExecCredential",
+				"status": {
+					"token": "foo-bar"
+				}
+			}`,
+			wantErr: true,
+		},
+		{
+			name: "no-status",
+			config: api.ExecConfig{
+				APIVersion: "client.authentication.k8s.io/v1alpha1",
+			},
+			wantInput: `{
+				"kind":"ExecCredential",
+				"apiVersion":"client.authentication.k8s.io/v1alpha1",
+				"spec": {}
+			}`,
+			output: `{
+				"kind": "ExecCredential",
+				"apiVersion":"client.authentication.k8s.io/v1alpha1"
+			}`,
+			wantErr: true,
+		},
+		{
+			name: "no-creds",
+			config: api.ExecConfig{
+				APIVersion: "client.authentication.k8s.io/v1alpha1",
+			},
+			wantInput: `{
+				"kind":"ExecCredential",
+				"apiVersion":"client.authentication.k8s.io/v1alpha1",
+				"spec": {}
+			}`,
+			output: `{
+				"kind": "ExecCredential",
+				"apiVersion":"client.authentication.k8s.io/v1alpha1",
+				"status": {}
+			}`,
+			wantErr: true,
+		},
+		{
+			name: "TLS credentials",
+			config: api.ExecConfig{
+				APIVersion: "client.authentication.k8s.io/v1alpha1",
+			},
+			wantInput: `{
+				"kind":"ExecCredential",
+				"apiVersion":"client.authentication.k8s.io/v1alpha1",
+				"spec": {}
+			}`,
+			output: fmt.Sprintf(`{
+				"kind": "ExecCredential",
+				"apiVersion": "client.authentication.k8s.io/v1alpha1",
+				"status": {
+					"clientKeyData": %q,
+					"clientCertificateData": %q
+				}
+			}`, keyData, certData),
+			wantCreds: credentials{cert: validCert},
+		},
+		{
+			name: "bad TLS credentials",
+			config: api.ExecConfig{
+				APIVersion: "client.authentication.k8s.io/v1alpha1",
+			},
+			wantInput: `{
+				"kind":"ExecCredential",
+				"apiVersion":"client.authentication.k8s.io/v1alpha1",
+				"spec": {}
+			}`,
+			output: `{
+				"kind": "ExecCredential",
+				"apiVersion": "client.authentication.k8s.io/v1alpha1",
+				"status": {
+					"clientKeyData": "foo",
+					"clientCertificateData": "bar"
+				}
+			}`,
+			wantErr: true,
+		},
+		{
+			name: "cert but no key",
+			config: api.ExecConfig{
+				APIVersion: "client.authentication.k8s.io/v1alpha1",
+			},
+			wantInput: `{
+				"kind":"ExecCredential",
+				"apiVersion":"client.authentication.k8s.io/v1alpha1",
+				"spec": {}
+			}`,
+			output: fmt.Sprintf(`{
+				"kind": "ExecCredential",
+				"apiVersion": "client.authentication.k8s.io/v1alpha1",
+				"status": {
+					"clientCertificateData": %q
+				}
+			}`, certData),
+			wantErr: true,
+		},
+		{
+			name: "beta-basic-request",
+			config: api.ExecConfig{
+				APIVersion: "client.authentication.k8s.io/v1beta1",
+			},
+			output: `{
+				"kind": "ExecCredential",
+				"apiVersion": "client.authentication.k8s.io/v1beta1",
+				"status": {
+					"token": "foo-bar"
+				}
+			}`,
+			wantCreds: credentials{token: "foo-bar"},
+		},
+		{
+			name: "beta-expiry",
+			config: api.ExecConfig{
+				APIVersion: "client.authentication.k8s.io/v1beta1",
+			},
+			output: `{
+				"kind": "ExecCredential",
+				"apiVersion": "client.authentication.k8s.io/v1beta1",
+				"status": {
+					"token": "foo-bar",
+					"expirationTimestamp": "2006-01-02T15:04:05Z"
+				}
+			}`,
+			wantExpiry: time.Date(2006, 01, 02, 15, 04, 05, 0, time.UTC),
+			wantCreds:  credentials{token: "foo-bar"},
+		},
+		{
+			name: "beta-no-group-version",
+			config: api.ExecConfig{
+				APIVersion: "client.authentication.k8s.io/v1beta1",
+			},
+			output: `{
+				"kind": "ExecCredential",
+				"status": {
+					"token": "foo-bar"
+				}
+			}`,
+			wantErr: true,
+		},
+		{
+			name: "beta-no-status",
+			config: api.ExecConfig{
+				APIVersion: "client.authentication.k8s.io/v1beta1",
+			},
+			output: `{
+				"kind": "ExecCredential",
+				"apiVersion":"client.authentication.k8s.io/v1beta1"
+			}`,
+			wantErr: true,
+		},
+		{
+			name: "beta-no-token",
+			config: api.ExecConfig{
+				APIVersion: "client.authentication.k8s.io/v1beta1",
+			},
+			output: `{
+				"kind": "ExecCredential",
+				"apiVersion":"client.authentication.k8s.io/v1beta1",
+				"status": {}
+			}`,
+			wantErr: true,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			c := test.config
+
+			c.Command = "./testdata/test-plugin.sh"
+			c.Env = append(c.Env, api.ExecEnvVar{
+				Name:  "TEST_OUTPUT",
+				Value: test.output,
+			})
+
+			a, err := newAuthenticator(newCache(), &c)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			stderr := &bytes.Buffer{}
+			a.stderr = stderr
+			a.interactive = test.interactive
+			a.environ = func() []string { return nil }
+
+			if err := a.refreshCredsLocked(test.response); err != nil {
+				if !test.wantErr {
+					t.Errorf("get token %v", err)
+				}
+				return
+			}
+			if test.wantErr {
+				t.Fatal("expected error getting token")
+			}
+
+			if !reflect.DeepEqual(a.cachedCreds, &test.wantCreds) {
+				t.Errorf("expected credentials %+v got %+v", &test.wantCreds, a.cachedCreds)
+			}
+
+			if !a.exp.Equal(test.wantExpiry) {
+				t.Errorf("expected expiry %v got %v", test.wantExpiry, a.exp)
+			}
+
+			if test.wantInput == "" {
+				if got := strings.TrimSpace(stderr.String()); got != "" {
+					t.Errorf("expected no input parameters, got %q", got)
+				}
+				return
+			}
+
+			compJSON(t, stderr.Bytes(), []byte(test.wantInput))
+		})
+	}
+}
+
+func TestRoundTripper(t *testing.T) {
+	wantToken := ""
+
+	n := time.Now()
+	now := func() time.Time { return n }
+
+	env := []string{""}
+	environ := func() []string {
+		s := make([]string, len(env))
+		copy(s, env)
+		return s
+	}
+
+	setOutput := func(s string) {
+		env[0] = "TEST_OUTPUT=" + s
+	}
+
+	handler := func(w http.ResponseWriter, r *http.Request) {
+		gotToken := ""
+		parts := strings.Split(r.Header.Get("Authorization"), " ")
+		if len(parts) > 1 && strings.EqualFold(parts[0], "bearer") {
+			gotToken = parts[1]
+		}
+
+		if wantToken != gotToken {
+			http.Error(w, "Unauthorized", http.StatusUnauthorized)
+			return
+		}
+		fmt.Fprintln(w, "ok")
+	}
+	server := httptest.NewServer(http.HandlerFunc(handler))
+
+	c := api.ExecConfig{
+		Command:    "./testdata/test-plugin.sh",
+		APIVersion: "client.authentication.k8s.io/v1alpha1",
+	}
+	a, err := newAuthenticator(newCache(), &c)
+	if err != nil {
+		t.Fatal(err)
+	}
+	a.environ = environ
+	a.now = now
+	a.stderr = ioutil.Discard
+
+	tc := &transport.Config{}
+	if err := a.UpdateTransportConfig(tc); err != nil {
+		t.Fatal(err)
+	}
+	client := http.Client{
+		Transport: tc.WrapTransport(http.DefaultTransport),
+	}
+
+	get := func(t *testing.T, statusCode int) {
+		t.Helper()
+		resp, err := client.Get(server.URL)
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer resp.Body.Close()
+		if resp.StatusCode != statusCode {
+			t.Errorf("wanted status %d got %d", statusCode, resp.StatusCode)
+		}
+	}
+
+	setOutput(`{
+		"kind": "ExecCredential",
+		"apiVersion": "client.authentication.k8s.io/v1alpha1",
+		"status": {
+			"token": "token1"
+		}
+	}`)
+	wantToken = "token1"
+	get(t, http.StatusOK)
+
+	setOutput(`{
+		"kind": "ExecCredential",
+		"apiVersion": "client.authentication.k8s.io/v1alpha1",
+		"status": {
+			"token": "token2"
+		}
+	}`)
+	// Previous token should be cached
+	get(t, http.StatusOK)
+
+	wantToken = "token2"
+	// Token is still cached, hits unauthorized but causes token to rotate.
+	get(t, http.StatusUnauthorized)
+	// Follow up request uses the rotated token.
+	get(t, http.StatusOK)
+
+	setOutput(`{
+		"kind": "ExecCredential",
+		"apiVersion": "client.authentication.k8s.io/v1alpha1",
+		"status": {
+			"token": "token3",
+			"expirationTimestamp": "` + now().Add(time.Hour).Format(time.RFC3339Nano) + `"
+		}
+	}`)
+	wantToken = "token3"
+	// Token is still cached, hit's unauthorized but causes rotation to token with an expiry.
+	get(t, http.StatusUnauthorized)
+	get(t, http.StatusOK)
+
+	// Move time forward 2 hours, "token3" is now expired.
+	n = n.Add(time.Hour * 2)
+	setOutput(`{
+		"kind": "ExecCredential",
+		"apiVersion": "client.authentication.k8s.io/v1alpha1",
+		"status": {
+			"token": "token4",
+			"expirationTimestamp": "` + now().Add(time.Hour).Format(time.RFC3339Nano) + `"
+		}
+	}`)
+	wantToken = "token4"
+	// Old token is expired, should refresh automatically without hitting a 401.
+	get(t, http.StatusOK)
+}
+
+func TestTLSCredentials(t *testing.T) {
+	now := time.Now()
+
+	certPool := x509.NewCertPool()
+	cert, key := genClientCert(t)
+	if !certPool.AppendCertsFromPEM(cert) {
+		t.Fatal("failed to add client cert to CertPool")
+	}
+
+	server := httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintln(w, "ok")
+	}))
+	server.TLS = &tls.Config{
+		ClientAuth: tls.RequireAndVerifyClientCert,
+		ClientCAs:  certPool,
+	}
+	server.StartTLS()
+	defer server.Close()
+
+	a, err := newAuthenticator(newCache(), &api.ExecConfig{
+		Command:    "./testdata/test-plugin.sh",
+		APIVersion: "client.authentication.k8s.io/v1alpha1",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	var output *clientauthentication.ExecCredential
+	a.environ = func() []string {
+		data, err := runtime.Encode(codecs.LegacyCodec(a.group), output)
+		if err != nil {
+			t.Fatal(err)
+		}
+		return []string{"TEST_OUTPUT=" + string(data)}
+	}
+	a.now = func() time.Time { return now }
+	a.stderr = ioutil.Discard
+
+	// We're not interested in server's cert, this test is about client cert.
+	tc := &transport.Config{TLS: transport.TLSConfig{Insecure: true}}
+	if err := a.UpdateTransportConfig(tc); err != nil {
+		t.Fatal(err)
+	}
+
+	get := func(t *testing.T, desc string, wantErr bool) {
+		t.Run(desc, func(t *testing.T) {
+			tlsCfg, err := transport.TLSConfigFor(tc)
+			if err != nil {
+				t.Fatal("TLSConfigFor:", err)
+			}
+			client := http.Client{
+				Transport: &http.Transport{TLSClientConfig: tlsCfg},
+			}
+			resp, err := client.Get(server.URL)
+			switch {
+			case err != nil && !wantErr:
+				t.Errorf("got client.Get error: %q, want nil", err)
+			case err == nil && wantErr:
+				t.Error("got nil client.Get error, want non-nil")
+			}
+			if err == nil {
+				resp.Body.Close()
+			}
+		})
+	}
+
+	output = &clientauthentication.ExecCredential{
+		Status: &clientauthentication.ExecCredentialStatus{
+			ClientCertificateData: string(cert),
+			ClientKeyData:         string(key),
+			ExpirationTimestamp:   &v1.Time{now.Add(time.Hour)},
+		},
+	}
+	get(t, "valid TLS cert", false)
+
+	// Advance time to force re-exec.
+	nCert, nKey := genClientCert(t)
+	now = now.Add(time.Hour * 2)
+	output = &clientauthentication.ExecCredential{
+		Status: &clientauthentication.ExecCredentialStatus{
+			ClientCertificateData: string(nCert),
+			ClientKeyData:         string(nKey),
+			ExpirationTimestamp:   &v1.Time{now.Add(time.Hour)},
+		},
+	}
+	get(t, "untrusted TLS cert", true)
+
+	now = now.Add(time.Hour * 2)
+	output = &clientauthentication.ExecCredential{
+		Status: &clientauthentication.ExecCredentialStatus{
+			ClientCertificateData: string(cert),
+			ClientKeyData:         string(key),
+			ExpirationTimestamp:   &v1.Time{now.Add(time.Hour)},
+		},
+	}
+	get(t, "valid TLS cert again", false)
+}
+
+// genClientCert generates an x509 certificate for testing. Certificate and key
+// are returned in PEM encoding.
+func genClientCert(t *testing.T) ([]byte, []byte) {
+	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	if err != nil {
+		t.Fatal(err)
+	}
+	keyRaw, err := x509.MarshalECPrivateKey(key)
+	if err != nil {
+		t.Fatal(err)
+	}
+	serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
+	serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
+	if err != nil {
+		t.Fatal(err)
+	}
+	cert := &x509.Certificate{
+		SerialNumber: serialNumber,
+		Subject:      pkix.Name{Organization: []string{"Acme Co"}},
+		NotBefore:    time.Now(),
+		NotAfter:     time.Now().Add(24 * time.Hour),
+
+		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
+		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
+		BasicConstraintsValid: true,
+	}
+	certRaw, err := x509.CreateCertificate(rand.Reader, cert, cert, key.Public(), key)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certRaw}),
+		pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: keyRaw})
+}

vendor/k8s.io/client-go/plugin/pkg/client/auth/exec/testdata/test-plugin.sh

@@ -0,0 +1,18 @@
+#!/bin/bash -e
+
+# Copyright 2018 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+>&2 echo "$KUBERNETES_EXEC_INFO"
+echo "$TEST_OUTPUT"