rebase: bump k8s.io/kubernetes from 1.26.2 to 1.27.2

Bumps [k8s.io/kubernetes](https://github.com/kubernetes/kubernetes) from 1.26.2 to 1.27.2.
- [Release notes](https://github.com/kubernetes/kubernetes/releases)
- [Commits](https://github.com/kubernetes/kubernetes/compare/v1.26.2...v1.27.2)

---
updated-dependencies:
- dependency-name: k8s.io/kubernetes
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/k8s.io/apiserver/pkg/authentication/request/anonymous/anonymous.go

@@ -0,0 +1,43 @@
+/*
+Copyright 2016 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 anonymous
+
+import (
+	"net/http"
+
+	"k8s.io/apiserver/pkg/authentication/authenticator"
+	"k8s.io/apiserver/pkg/authentication/user"
+)
+
+const (
+	anonymousUser = user.Anonymous
+
+	unauthenticatedGroup = user.AllUnauthenticated
+)
+
+func NewAuthenticator() authenticator.Request {
+	return authenticator.RequestFunc(func(req *http.Request) (*authenticator.Response, bool, error) {
+		auds, _ := authenticator.AudiencesFrom(req.Context())
+		return &authenticator.Response{
+			User: &user.DefaultInfo{
+				Name:   anonymousUser,
+				Groups: []string{unauthenticatedGroup},
+			},
+			Audiences: auds,
+		}, true, nil
+	})
+}

vendor/k8s.io/apiserver/pkg/authentication/request/bearertoken/bearertoken.go

@@ -0,0 +1,76 @@
+/*
+Copyright 2014 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 bearertoken
+
+import (
+	"errors"
+	"net/http"
+	"strings"
+
+	"k8s.io/apiserver/pkg/authentication/authenticator"
+	"k8s.io/apiserver/pkg/warning"
+)
+
+const (
+	invalidTokenWithSpaceWarning = "the provided Authorization header contains extra space before the bearer token, and is ignored"
+)
+
+type Authenticator struct {
+	auth authenticator.Token
+}
+
+func New(auth authenticator.Token) *Authenticator {
+	return &Authenticator{auth}
+}
+
+var invalidToken = errors.New("invalid bearer token")
+
+func (a *Authenticator) AuthenticateRequest(req *http.Request) (*authenticator.Response, bool, error) {
+	auth := strings.TrimSpace(req.Header.Get("Authorization"))
+	if auth == "" {
+		return nil, false, nil
+	}
+	parts := strings.SplitN(auth, " ", 3)
+	if len(parts) < 2 || strings.ToLower(parts[0]) != "bearer" {
+		return nil, false, nil
+	}
+
+	token := parts[1]
+
+	// Empty bearer tokens aren't valid
+	if len(token) == 0 {
+		// The space before the token case
+		if len(parts) == 3 {
+			warning.AddWarning(req.Context(), "", invalidTokenWithSpaceWarning)
+		}
+		return nil, false, nil
+	}
+
+	resp, ok, err := a.auth.AuthenticateToken(req.Context(), token)
+	// if we authenticated successfully, go ahead and remove the bearer token so that no one
+	// is ever tempted to use it inside of the API server
+	if ok {
+		req.Header.Del("Authorization")
+	}
+
+	// If the token authenticator didn't error, provide a default error
+	if !ok && err == nil {
+		err = invalidToken
+	}
+
+	return resp, ok, err
+}

vendor/k8s.io/apiserver/pkg/authentication/request/headerrequest/requestheader.go

@@ -0,0 +1,239 @@
+/*
+Copyright 2016 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 headerrequest
+
+import (
+	"crypto/x509"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"k8s.io/apiserver/pkg/authentication/authenticator"
+	x509request "k8s.io/apiserver/pkg/authentication/request/x509"
+	"k8s.io/apiserver/pkg/authentication/user"
+	utilcert "k8s.io/client-go/util/cert"
+)
+
+// StringSliceProvider is a way to get a string slice value.  It is heavily used for authentication headers among other places.
+type StringSliceProvider interface {
+	// Value returns the current string slice.  Callers should never mutate the returned value.
+	Value() []string
+}
+
+// StringSliceProviderFunc is a function that matches the StringSliceProvider interface
+type StringSliceProviderFunc func() []string
+
+// Value returns the current string slice.  Callers should never mutate the returned value.
+func (d StringSliceProviderFunc) Value() []string {
+	return d()
+}
+
+// StaticStringSlice a StringSliceProvider that returns a fixed value
+type StaticStringSlice []string
+
+// Value returns the current string slice.  Callers should never mutate the returned value.
+func (s StaticStringSlice) Value() []string {
+	return s
+}
+
+type requestHeaderAuthRequestHandler struct {
+	// nameHeaders are the headers to check (in order, case-insensitively) for an identity. The first header with a value wins.
+	nameHeaders StringSliceProvider
+
+	// groupHeaders are the headers to check (case-insensitively) for group membership.  All values of all headers will be added.
+	groupHeaders StringSliceProvider
+
+	// extraHeaderPrefixes are the head prefixes to check (case-insensitively) for filling in
+	// the user.Info.Extra.  All values of all matching headers will be added.
+	extraHeaderPrefixes StringSliceProvider
+}
+
+func New(nameHeaders, groupHeaders, extraHeaderPrefixes []string) (authenticator.Request, error) {
+	trimmedNameHeaders, err := trimHeaders(nameHeaders...)
+	if err != nil {
+		return nil, err
+	}
+	trimmedGroupHeaders, err := trimHeaders(groupHeaders...)
+	if err != nil {
+		return nil, err
+	}
+	trimmedExtraHeaderPrefixes, err := trimHeaders(extraHeaderPrefixes...)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewDynamic(
+		StaticStringSlice(trimmedNameHeaders),
+		StaticStringSlice(trimmedGroupHeaders),
+		StaticStringSlice(trimmedExtraHeaderPrefixes),
+	), nil
+}
+
+func NewDynamic(nameHeaders, groupHeaders, extraHeaderPrefixes StringSliceProvider) authenticator.Request {
+	return &requestHeaderAuthRequestHandler{
+		nameHeaders:         nameHeaders,
+		groupHeaders:        groupHeaders,
+		extraHeaderPrefixes: extraHeaderPrefixes,
+	}
+}
+
+func trimHeaders(headerNames ...string) ([]string, error) {
+	ret := []string{}
+	for _, headerName := range headerNames {
+		trimmedHeader := strings.TrimSpace(headerName)
+		if len(trimmedHeader) == 0 {
+			return nil, fmt.Errorf("empty header %q", headerName)
+		}
+		ret = append(ret, trimmedHeader)
+	}
+
+	return ret, nil
+}
+
+func NewSecure(clientCA string, proxyClientNames []string, nameHeaders []string, groupHeaders []string, extraHeaderPrefixes []string) (authenticator.Request, error) {
+	if len(clientCA) == 0 {
+		return nil, fmt.Errorf("missing clientCA file")
+	}
+
+	// Wrap with an x509 verifier
+	caData, err := ioutil.ReadFile(clientCA)
+	if err != nil {
+		return nil, fmt.Errorf("error reading %s: %v", clientCA, err)
+	}
+	opts := x509request.DefaultVerifyOptions()
+	opts.Roots = x509.NewCertPool()
+	certs, err := utilcert.ParseCertsPEM(caData)
+	if err != nil {
+		return nil, fmt.Errorf("error loading certs from  %s: %v", clientCA, err)
+	}
+	for _, cert := range certs {
+		opts.Roots.AddCert(cert)
+	}
+
+	trimmedNameHeaders, err := trimHeaders(nameHeaders...)
+	if err != nil {
+		return nil, err
+	}
+	trimmedGroupHeaders, err := trimHeaders(groupHeaders...)
+	if err != nil {
+		return nil, err
+	}
+	trimmedExtraHeaderPrefixes, err := trimHeaders(extraHeaderPrefixes...)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewDynamicVerifyOptionsSecure(
+		x509request.StaticVerifierFn(opts),
+		StaticStringSlice(proxyClientNames),
+		StaticStringSlice(trimmedNameHeaders),
+		StaticStringSlice(trimmedGroupHeaders),
+		StaticStringSlice(trimmedExtraHeaderPrefixes),
+	), nil
+}
+
+func NewDynamicVerifyOptionsSecure(verifyOptionFn x509request.VerifyOptionFunc, proxyClientNames, nameHeaders, groupHeaders, extraHeaderPrefixes StringSliceProvider) authenticator.Request {
+	headerAuthenticator := NewDynamic(nameHeaders, groupHeaders, extraHeaderPrefixes)
+
+	return x509request.NewDynamicCAVerifier(verifyOptionFn, headerAuthenticator, proxyClientNames)
+}
+
+func (a *requestHeaderAuthRequestHandler) AuthenticateRequest(req *http.Request) (*authenticator.Response, bool, error) {
+	name := headerValue(req.Header, a.nameHeaders.Value())
+	if len(name) == 0 {
+		return nil, false, nil
+	}
+	groups := allHeaderValues(req.Header, a.groupHeaders.Value())
+	extra := newExtra(req.Header, a.extraHeaderPrefixes.Value())
+
+	// clear headers used for authentication
+	for _, headerName := range a.nameHeaders.Value() {
+		req.Header.Del(headerName)
+	}
+	for _, headerName := range a.groupHeaders.Value() {
+		req.Header.Del(headerName)
+	}
+	for k := range extra {
+		for _, prefix := range a.extraHeaderPrefixes.Value() {
+			req.Header.Del(prefix + k)
+		}
+	}
+
+	return &authenticator.Response{
+		User: &user.DefaultInfo{
+			Name:   name,
+			Groups: groups,
+			Extra:  extra,
+		},
+	}, true, nil
+}
+
+func headerValue(h http.Header, headerNames []string) string {
+	for _, headerName := range headerNames {
+		headerValue := h.Get(headerName)
+		if len(headerValue) > 0 {
+			return headerValue
+		}
+	}
+	return ""
+}
+
+func allHeaderValues(h http.Header, headerNames []string) []string {
+	ret := []string{}
+	for _, headerName := range headerNames {
+		headerKey := http.CanonicalHeaderKey(headerName)
+		values, ok := h[headerKey]
+		if !ok {
+			continue
+		}
+
+		for _, headerValue := range values {
+			if len(headerValue) > 0 {
+				ret = append(ret, headerValue)
+			}
+		}
+	}
+	return ret
+}
+
+func unescapeExtraKey(encodedKey string) string {
+	key, err := url.PathUnescape(encodedKey) // Decode %-encoded bytes.
+	if err != nil {
+		return encodedKey // Always record extra strings, even if malformed/unencoded.
+	}
+	return key
+}
+
+func newExtra(h http.Header, headerPrefixes []string) map[string][]string {
+	ret := map[string][]string{}
+
+	// we have to iterate over prefixes first in order to have proper ordering inside the value slices
+	for _, prefix := range headerPrefixes {
+		for headerName, vv := range h {
+			if !strings.HasPrefix(strings.ToLower(headerName), strings.ToLower(prefix)) {
+				continue
+			}
+
+			extraKey := unescapeExtraKey(strings.ToLower(headerName[len(prefix):]))
+			ret[extraKey] = append(ret[extraKey], vv...)
+		}
+	}
+
+	return ret
+}

vendor/k8s.io/apiserver/pkg/authentication/request/headerrequest/requestheader_controller.go

@@ -0,0 +1,337 @@
+/*
+Copyright 2020 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 headerrequest
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	corev1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/equality"
+	"k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/fields"
+	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
+	"k8s.io/apimachinery/pkg/util/wait"
+	coreinformers "k8s.io/client-go/informers/core/v1"
+	"k8s.io/client-go/kubernetes"
+	corev1listers "k8s.io/client-go/listers/core/v1"
+	"k8s.io/client-go/tools/cache"
+	"k8s.io/client-go/util/workqueue"
+	"k8s.io/klog/v2"
+	"sync/atomic"
+)
+
+const (
+	authenticationRoleName = "extension-apiserver-authentication-reader"
+)
+
+// RequestHeaderAuthRequestProvider a provider that knows how to dynamically fill parts of RequestHeaderConfig struct
+type RequestHeaderAuthRequestProvider interface {
+	UsernameHeaders() []string
+	GroupHeaders() []string
+	ExtraHeaderPrefixes() []string
+	AllowedClientNames() []string
+}
+
+var _ RequestHeaderAuthRequestProvider = &RequestHeaderAuthRequestController{}
+
+type requestHeaderBundle struct {
+	UsernameHeaders     []string
+	GroupHeaders        []string
+	ExtraHeaderPrefixes []string
+	AllowedClientNames  []string
+}
+
+// RequestHeaderAuthRequestController a controller that exposes a set of methods for dynamically filling parts of RequestHeaderConfig struct.
+// The methods are sourced from the config map which is being monitored by this controller.
+// The controller is primed from the server at the construction time for components that don't want to dynamically react to changes
+// in the config map.
+type RequestHeaderAuthRequestController struct {
+	name string
+
+	configmapName      string
+	configmapNamespace string
+
+	client                  kubernetes.Interface
+	configmapLister         corev1listers.ConfigMapNamespaceLister
+	configmapInformer       cache.SharedIndexInformer
+	configmapInformerSynced cache.InformerSynced
+
+	queue workqueue.RateLimitingInterface
+
+	// exportedRequestHeaderBundle is a requestHeaderBundle that contains the last read, non-zero length content of the configmap
+	exportedRequestHeaderBundle atomic.Value
+
+	usernameHeadersKey     string
+	groupHeadersKey        string
+	extraHeaderPrefixesKey string
+	allowedClientNamesKey  string
+}
+
+// NewRequestHeaderAuthRequestController creates a new controller that implements RequestHeaderAuthRequestController
+func NewRequestHeaderAuthRequestController(
+	cmName string,
+	cmNamespace string,
+	client kubernetes.Interface,
+	usernameHeadersKey, groupHeadersKey, extraHeaderPrefixesKey, allowedClientNamesKey string) *RequestHeaderAuthRequestController {
+	c := &RequestHeaderAuthRequestController{
+		name: "RequestHeaderAuthRequestController",
+
+		client: client,
+
+		configmapName:      cmName,
+		configmapNamespace: cmNamespace,
+
+		usernameHeadersKey:     usernameHeadersKey,
+		groupHeadersKey:        groupHeadersKey,
+		extraHeaderPrefixesKey: extraHeaderPrefixesKey,
+		allowedClientNamesKey:  allowedClientNamesKey,
+
+		queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "RequestHeaderAuthRequestController"),
+	}
+
+	// we construct our own informer because we need such a small subset of the information available.  Just one namespace.
+	c.configmapInformer = coreinformers.NewFilteredConfigMapInformer(client, c.configmapNamespace, 12*time.Hour, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc}, func(listOptions *metav1.ListOptions) {
+		listOptions.FieldSelector = fields.OneTermEqualSelector("metadata.name", c.configmapName).String()
+	})
+
+	c.configmapInformer.AddEventHandler(cache.FilteringResourceEventHandler{
+		FilterFunc: func(obj interface{}) bool {
+			if cast, ok := obj.(*corev1.ConfigMap); ok {
+				return cast.Name == c.configmapName && cast.Namespace == c.configmapNamespace
+			}
+			if tombstone, ok := obj.(cache.DeletedFinalStateUnknown); ok {
+				if cast, ok := tombstone.Obj.(*corev1.ConfigMap); ok {
+					return cast.Name == c.configmapName && cast.Namespace == c.configmapNamespace
+				}
+			}
+			return true // always return true just in case.  The checks are fairly cheap
+		},
+		Handler: cache.ResourceEventHandlerFuncs{
+			// we have a filter, so any time we're called, we may as well queue. We only ever check one configmap
+			// so we don't have to be choosy about our key.
+			AddFunc: func(obj interface{}) {
+				c.queue.Add(c.keyFn())
+			},
+			UpdateFunc: func(oldObj, newObj interface{}) {
+				c.queue.Add(c.keyFn())
+			},
+			DeleteFunc: func(obj interface{}) {
+				c.queue.Add(c.keyFn())
+			},
+		},
+	})
+
+	c.configmapLister = corev1listers.NewConfigMapLister(c.configmapInformer.GetIndexer()).ConfigMaps(c.configmapNamespace)
+	c.configmapInformerSynced = c.configmapInformer.HasSynced
+
+	return c
+}
+
+func (c *RequestHeaderAuthRequestController) UsernameHeaders() []string {
+	return c.loadRequestHeaderFor(c.usernameHeadersKey)
+}
+
+func (c *RequestHeaderAuthRequestController) GroupHeaders() []string {
+	return c.loadRequestHeaderFor(c.groupHeadersKey)
+}
+
+func (c *RequestHeaderAuthRequestController) ExtraHeaderPrefixes() []string {
+	return c.loadRequestHeaderFor(c.extraHeaderPrefixesKey)
+}
+
+func (c *RequestHeaderAuthRequestController) AllowedClientNames() []string {
+	return c.loadRequestHeaderFor(c.allowedClientNamesKey)
+}
+
+// Run starts RequestHeaderAuthRequestController controller and blocks until stopCh is closed.
+func (c *RequestHeaderAuthRequestController) Run(ctx context.Context, workers int) {
+	defer utilruntime.HandleCrash()
+	defer c.queue.ShutDown()
+
+	klog.Infof("Starting %s", c.name)
+	defer klog.Infof("Shutting down %s", c.name)
+
+	go c.configmapInformer.Run(ctx.Done())
+
+	// wait for caches to fill before starting your work
+	if !cache.WaitForNamedCacheSync(c.name, ctx.Done(), c.configmapInformerSynced) {
+		return
+	}
+
+	// doesn't matter what workers say, only start one.
+	go wait.Until(c.runWorker, time.Second, ctx.Done())
+
+	<-ctx.Done()
+}
+
+// // RunOnce runs a single sync loop
+func (c *RequestHeaderAuthRequestController) RunOnce(ctx context.Context) error {
+	configMap, err := c.client.CoreV1().ConfigMaps(c.configmapNamespace).Get(ctx, c.configmapName, metav1.GetOptions{})
+	switch {
+	case errors.IsNotFound(err):
+		// ignore, authConfigMap is nil now
+		return nil
+	case errors.IsForbidden(err):
+		klog.Warningf("Unable to get configmap/%s in %s.  Usually fixed by "+
+			"'kubectl create rolebinding -n %s ROLEBINDING_NAME --role=%s --serviceaccount=YOUR_NS:YOUR_SA'",
+			c.configmapName, c.configmapNamespace, c.configmapNamespace, authenticationRoleName)
+		return err
+	case err != nil:
+		return err
+	}
+	return c.syncConfigMap(configMap)
+}
+
+func (c *RequestHeaderAuthRequestController) runWorker() {
+	for c.processNextWorkItem() {
+	}
+}
+
+func (c *RequestHeaderAuthRequestController) processNextWorkItem() bool {
+	dsKey, quit := c.queue.Get()
+	if quit {
+		return false
+	}
+	defer c.queue.Done(dsKey)
+
+	err := c.sync()
+	if err == nil {
+		c.queue.Forget(dsKey)
+		return true
+	}
+
+	utilruntime.HandleError(fmt.Errorf("%v failed with : %v", dsKey, err))
+	c.queue.AddRateLimited(dsKey)
+
+	return true
+}
+
+// sync reads the config and propagates the changes to exportedRequestHeaderBundle
+// which is exposed by the set of methods that are used to fill RequestHeaderConfig struct
+func (c *RequestHeaderAuthRequestController) sync() error {
+	configMap, err := c.configmapLister.Get(c.configmapName)
+	if err != nil {
+		return err
+	}
+	return c.syncConfigMap(configMap)
+}
+
+func (c *RequestHeaderAuthRequestController) syncConfigMap(configMap *corev1.ConfigMap) error {
+	hasChanged, newRequestHeaderBundle, err := c.hasRequestHeaderBundleChanged(configMap)
+	if err != nil {
+		return err
+	}
+	if hasChanged {
+		c.exportedRequestHeaderBundle.Store(newRequestHeaderBundle)
+		klog.V(2).Infof("Loaded a new request header values for %v", c.name)
+	}
+	return nil
+}
+
+func (c *RequestHeaderAuthRequestController) hasRequestHeaderBundleChanged(cm *corev1.ConfigMap) (bool, *requestHeaderBundle, error) {
+	currentHeadersBundle, err := c.getRequestHeaderBundleFromConfigMap(cm)
+	if err != nil {
+		return false, nil, err
+	}
+
+	rawHeaderBundle := c.exportedRequestHeaderBundle.Load()
+	if rawHeaderBundle == nil {
+		return true, currentHeadersBundle, nil
+	}
+
+	// check to see if we have a change. If the values are the same, do nothing.
+	loadedHeadersBundle, ok := rawHeaderBundle.(*requestHeaderBundle)
+	if !ok {
+		return true, currentHeadersBundle, nil
+	}
+
+	if !equality.Semantic.DeepEqual(loadedHeadersBundle, currentHeadersBundle) {
+		return true, currentHeadersBundle, nil
+	}
+	return false, nil, nil
+}
+
+func (c *RequestHeaderAuthRequestController) getRequestHeaderBundleFromConfigMap(cm *corev1.ConfigMap) (*requestHeaderBundle, error) {
+	usernameHeaderCurrentValue, err := deserializeStrings(cm.Data[c.usernameHeadersKey])
+	if err != nil {
+		return nil, err
+	}
+
+	groupHeadersCurrentValue, err := deserializeStrings(cm.Data[c.groupHeadersKey])
+	if err != nil {
+		return nil, err
+	}
+
+	extraHeaderPrefixesCurrentValue, err := deserializeStrings(cm.Data[c.extraHeaderPrefixesKey])
+	if err != nil {
+		return nil, err
+
+	}
+
+	allowedClientNamesCurrentValue, err := deserializeStrings(cm.Data[c.allowedClientNamesKey])
+	if err != nil {
+		return nil, err
+	}
+
+	return &requestHeaderBundle{
+		UsernameHeaders:     usernameHeaderCurrentValue,
+		GroupHeaders:        groupHeadersCurrentValue,
+		ExtraHeaderPrefixes: extraHeaderPrefixesCurrentValue,
+		AllowedClientNames:  allowedClientNamesCurrentValue,
+	}, nil
+}
+
+func (c *RequestHeaderAuthRequestController) loadRequestHeaderFor(key string) []string {
+	rawHeaderBundle := c.exportedRequestHeaderBundle.Load()
+	if rawHeaderBundle == nil {
+		return nil // this can happen if we've been unable load data from the apiserver for some reason
+	}
+	headerBundle := rawHeaderBundle.(*requestHeaderBundle)
+
+	switch key {
+	case c.usernameHeadersKey:
+		return headerBundle.UsernameHeaders
+	case c.groupHeadersKey:
+		return headerBundle.GroupHeaders
+	case c.extraHeaderPrefixesKey:
+		return headerBundle.ExtraHeaderPrefixes
+	case c.allowedClientNamesKey:
+		return headerBundle.AllowedClientNames
+	default:
+		return nil
+	}
+}
+
+func (c *RequestHeaderAuthRequestController) keyFn() string {
+	// this format matches DeletionHandlingMetaNamespaceKeyFunc for our single key
+	return c.configmapNamespace + "/" + c.configmapName
+}
+
+func deserializeStrings(in string) ([]string, error) {
+	if len(in) == 0 {
+		return nil, nil
+	}
+	var ret []string
+	if err := json.Unmarshal([]byte(in), &ret); err != nil {
+		return nil, err
+	}
+	return ret, nil
+}

vendor/k8s.io/apiserver/pkg/authentication/request/union/union.go

@@ -0,0 +1,71 @@
+/*
+Copyright 2014 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 union
+
+import (
+	"net/http"
+
+	utilerrors "k8s.io/apimachinery/pkg/util/errors"
+	"k8s.io/apiserver/pkg/authentication/authenticator"
+)
+
+// unionAuthRequestHandler authenticates requests using a chain of authenticator.Requests
+type unionAuthRequestHandler struct {
+	// Handlers is a chain of request authenticators to delegate to
+	Handlers []authenticator.Request
+	// FailOnError determines whether an error returns short-circuits the chain
+	FailOnError bool
+}
+
+// New returns a request authenticator that validates credentials using a chain of authenticator.Request objects.
+// The entire chain is tried until one succeeds. If all fail, an aggregate error is returned.
+func New(authRequestHandlers ...authenticator.Request) authenticator.Request {
+	if len(authRequestHandlers) == 1 {
+		return authRequestHandlers[0]
+	}
+	return &unionAuthRequestHandler{Handlers: authRequestHandlers, FailOnError: false}
+}
+
+// NewFailOnError returns a request authenticator that validates credentials using a chain of authenticator.Request objects.
+// The first error short-circuits the chain.
+func NewFailOnError(authRequestHandlers ...authenticator.Request) authenticator.Request {
+	if len(authRequestHandlers) == 1 {
+		return authRequestHandlers[0]
+	}
+	return &unionAuthRequestHandler{Handlers: authRequestHandlers, FailOnError: true}
+}
+
+// AuthenticateRequest authenticates the request using a chain of authenticator.Request objects.
+func (authHandler *unionAuthRequestHandler) AuthenticateRequest(req *http.Request) (*authenticator.Response, bool, error) {
+	var errlist []error
+	for _, currAuthRequestHandler := range authHandler.Handlers {
+		resp, ok, err := currAuthRequestHandler.AuthenticateRequest(req)
+		if err != nil {
+			if authHandler.FailOnError {
+				return resp, ok, err
+			}
+			errlist = append(errlist, err)
+			continue
+		}
+
+		if ok {
+			return resp, ok, err
+		}
+	}
+
+	return nil, false, utilerrors.NewAggregate(errlist)
+}

vendor/k8s.io/apiserver/pkg/authentication/request/websocket/protocol.go

@@ -0,0 +1,108 @@
+/*
+Copyright 2017 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 websocket
+
+import (
+	"encoding/base64"
+	"errors"
+	"net/http"
+	"net/textproto"
+	"strings"
+	"unicode/utf8"
+
+	"k8s.io/apiserver/pkg/authentication/authenticator"
+	"k8s.io/apiserver/pkg/util/wsstream"
+)
+
+const bearerProtocolPrefix = "base64url.bearer.authorization.k8s.io."
+
+var protocolHeader = textproto.CanonicalMIMEHeaderKey("Sec-WebSocket-Protocol")
+
+var errInvalidToken = errors.New("invalid bearer token")
+
+// ProtocolAuthenticator allows a websocket connection to provide a bearer token as a subprotocol
+// in the format "base64url.bearer.authorization.<base64url-without-padding(bearer-token)>"
+type ProtocolAuthenticator struct {
+	// auth is the token authenticator to use to validate the token
+	auth authenticator.Token
+}
+
+func NewProtocolAuthenticator(auth authenticator.Token) *ProtocolAuthenticator {
+	return &ProtocolAuthenticator{auth}
+}
+
+func (a *ProtocolAuthenticator) AuthenticateRequest(req *http.Request) (*authenticator.Response, bool, error) {
+	// Only accept websocket connections
+	if !wsstream.IsWebSocketRequest(req) {
+		return nil, false, nil
+	}
+
+	token := ""
+	sawTokenProtocol := false
+	filteredProtocols := []string{}
+	for _, protocolHeader := range req.Header[protocolHeader] {
+		for _, protocol := range strings.Split(protocolHeader, ",") {
+			protocol = strings.TrimSpace(protocol)
+
+			if !strings.HasPrefix(protocol, bearerProtocolPrefix) {
+				filteredProtocols = append(filteredProtocols, protocol)
+				continue
+			}
+
+			if sawTokenProtocol {
+				return nil, false, errors.New("multiple base64.bearer.authorization tokens specified")
+			}
+			sawTokenProtocol = true
+
+			encodedToken := strings.TrimPrefix(protocol, bearerProtocolPrefix)
+			decodedToken, err := base64.RawURLEncoding.DecodeString(encodedToken)
+			if err != nil {
+				return nil, false, errors.New("invalid base64.bearer.authorization token encoding")
+			}
+			if !utf8.Valid(decodedToken) {
+				return nil, false, errors.New("invalid base64.bearer.authorization token")
+			}
+			token = string(decodedToken)
+		}
+	}
+
+	// Must pass at least one other subprotocol so that we can remove the one containing the bearer token,
+	// and there is at least one to echo back to the client
+	if len(token) > 0 && len(filteredProtocols) == 0 {
+		return nil, false, errors.New("missing additional subprotocol")
+	}
+
+	if len(token) == 0 {
+		return nil, false, nil
+	}
+
+	resp, ok, err := a.auth.AuthenticateToken(req.Context(), token)
+
+	// on success, remove the protocol with the token
+	if ok {
+		// https://tools.ietf.org/html/rfc6455#section-11.3.4 indicates the Sec-WebSocket-Protocol header may appear multiple times
+		// in a request, and is logically the same as a single Sec-WebSocket-Protocol header field that contains all values
+		req.Header.Set(protocolHeader, strings.Join(filteredProtocols, ","))
+	}
+
+	// If the token authenticator didn't error, provide a default error
+	if !ok && err == nil {
+		err = errInvalidToken
+	}
+
+	return resp, ok, err
+}

vendor/k8s.io/apiserver/pkg/authentication/request/x509/OWNERS

@@ -0,0 +1,8 @@
+# See the OWNERS docs at https://go.k8s.io/owners
+
+approvers:
+  - sig-auth-certificates-approvers
+reviewers:
+  - sig-auth-certificates-reviewers
+labels:
+  - sig/auth

vendor/k8s.io/apiserver/pkg/authentication/request/x509/doc.go

@@ -0,0 +1,19 @@
+/*
+Copyright 2014 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 x509 provides a request authenticator that validates and
+// extracts user information from client certificates
+package x509 // import "k8s.io/apiserver/pkg/authentication/request/x509"

vendor/k8s.io/apiserver/pkg/authentication/request/x509/verify_options.go

@@ -0,0 +1,71 @@
+/*
+Copyright 2019 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 x509
+
+import (
+	"crypto/x509"
+	"fmt"
+
+	"k8s.io/client-go/util/cert"
+)
+
+// StaticVerifierFn is a VerifyOptionFunc that always returns the same value.  This allows verify options that cannot change.
+func StaticVerifierFn(opts x509.VerifyOptions) VerifyOptionFunc {
+	return func() (x509.VerifyOptions, bool) {
+		return opts, true
+	}
+}
+
+// NewStaticVerifierFromFile creates a new verification func from a file.  It reads the content and then fails.
+// It will return a nil function if you pass an empty CA file.
+func NewStaticVerifierFromFile(clientCA string) (VerifyOptionFunc, error) {
+	if len(clientCA) == 0 {
+		return nil, nil
+	}
+
+	// Wrap with an x509 verifier
+	var err error
+	opts := DefaultVerifyOptions()
+	opts.Roots, err = cert.NewPool(clientCA)
+	if err != nil {
+		return nil, fmt.Errorf("error loading certs from  %s: %v", clientCA, err)
+	}
+
+	return StaticVerifierFn(opts), nil
+}
+
+// StringSliceProvider is a way to get a string slice value.  It is heavily used for authentication headers among other places.
+type StringSliceProvider interface {
+	// Value returns the current string slice.  Callers should never mutate the returned value.
+	Value() []string
+}
+
+// StringSliceProviderFunc is a function that matches the StringSliceProvider interface
+type StringSliceProviderFunc func() []string
+
+// Value returns the current string slice.  Callers should never mutate the returned value.
+func (d StringSliceProviderFunc) Value() []string {
+	return d()
+}
+
+// StaticStringSlice a StringSliceProvider that returns a fixed value
+type StaticStringSlice []string
+
+// Value returns the current string slice.  Callers should never mutate the returned value.
+func (s StaticStringSlice) Value() []string {
+	return s
+}

vendor/k8s.io/apiserver/pkg/authentication/request/x509/x509.go

@@ -0,0 +1,258 @@
+/*
+Copyright 2014 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 x509
+
+import (
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/hex"
+	"fmt"
+	"net/http"
+	"strings"
+	"time"
+
+	utilerrors "k8s.io/apimachinery/pkg/util/errors"
+	"k8s.io/apimachinery/pkg/util/sets"
+	"k8s.io/apiserver/pkg/authentication/authenticator"
+	"k8s.io/apiserver/pkg/authentication/user"
+	"k8s.io/component-base/metrics"
+	"k8s.io/component-base/metrics/legacyregistry"
+)
+
+/*
+ * By default, the following metric is defined as falling under
+ * ALPHA stability level https://github.com/kubernetes/enhancements/blob/master/keps/sig-instrumentation/1209-metrics-stability/kubernetes-control-plane-metrics-stability.md#stability-classes)
+ *
+ * Promoting the stability level of the metric is a responsibility of the component owner, since it
+ * involves explicitly acknowledging support for the metric across multiple releases, in accordance with
+ * the metric stability policy.
+ */
+var clientCertificateExpirationHistogram = metrics.NewHistogram(
+	&metrics.HistogramOpts{
+		Namespace: "apiserver",
+		Subsystem: "client",
+		Name:      "certificate_expiration_seconds",
+		Help:      "Distribution of the remaining lifetime on the certificate used to authenticate a request.",
+		Buckets: []float64{
+			0,
+			1800,     // 30 minutes
+			3600,     // 1 hour
+			7200,     // 2 hours
+			21600,    // 6 hours
+			43200,    // 12 hours
+			86400,    // 1 day
+			172800,   // 2 days
+			345600,   // 4 days
+			604800,   // 1 week
+			2592000,  // 1 month
+			7776000,  // 3 months
+			15552000, // 6 months
+			31104000, // 1 year
+		},
+		StabilityLevel: metrics.ALPHA,
+	},
+)
+
+func init() {
+	legacyregistry.MustRegister(clientCertificateExpirationHistogram)
+}
+
+// UserConversion defines an interface for extracting user info from a client certificate chain
+type UserConversion interface {
+	User(chain []*x509.Certificate) (*authenticator.Response, bool, error)
+}
+
+// UserConversionFunc is a function that implements the UserConversion interface.
+type UserConversionFunc func(chain []*x509.Certificate) (*authenticator.Response, bool, error)
+
+// User implements x509.UserConversion
+func (f UserConversionFunc) User(chain []*x509.Certificate) (*authenticator.Response, bool, error) {
+	return f(chain)
+}
+
+func columnSeparatedHex(d []byte) string {
+	h := strings.ToUpper(hex.EncodeToString(d))
+	var sb strings.Builder
+	for i, r := range h {
+		sb.WriteRune(r)
+		if i%2 == 1 && i != len(h)-1 {
+			sb.WriteRune(':')
+		}
+	}
+	return sb.String()
+}
+
+func certificateIdentifier(c *x509.Certificate) string {
+	return fmt.Sprintf(
+		"SN=%d, SKID=%s, AKID=%s",
+		c.SerialNumber,
+		columnSeparatedHex(c.SubjectKeyId),
+		columnSeparatedHex(c.AuthorityKeyId),
+	)
+}
+
+// VerifyOptionFunc is function which provides a shallow copy of the VerifyOptions to the authenticator.  This allows
+// for cases where the options (particularly the CAs) can change.  If the bool is false, then the returned VerifyOptions
+// are ignored and the authenticator will express "no opinion".  This allows a clear signal for cases where a CertPool
+// is eventually expected, but not currently present.
+type VerifyOptionFunc func() (x509.VerifyOptions, bool)
+
+// Authenticator implements request.Authenticator by extracting user info from verified client certificates
+type Authenticator struct {
+	verifyOptionsFn VerifyOptionFunc
+	user            UserConversion
+}
+
+// New returns a request.Authenticator that verifies client certificates using the provided
+// VerifyOptions, and converts valid certificate chains into user.Info using the provided UserConversion
+func New(opts x509.VerifyOptions, user UserConversion) *Authenticator {
+	return NewDynamic(StaticVerifierFn(opts), user)
+}
+
+// NewDynamic returns a request.Authenticator that verifies client certificates using the provided
+// VerifyOptionFunc (which may be dynamic), and converts valid certificate chains into user.Info using the provided UserConversion
+func NewDynamic(verifyOptionsFn VerifyOptionFunc, user UserConversion) *Authenticator {
+	return &Authenticator{verifyOptionsFn, user}
+}
+
+// AuthenticateRequest authenticates the request using presented client certificates
+func (a *Authenticator) AuthenticateRequest(req *http.Request) (*authenticator.Response, bool, error) {
+	if req.TLS == nil || len(req.TLS.PeerCertificates) == 0 {
+		return nil, false, nil
+	}
+
+	// Use intermediates, if provided
+	optsCopy, ok := a.verifyOptionsFn()
+	// if there are intentionally no verify options, then we cannot authenticate this request
+	if !ok {
+		return nil, false, nil
+	}
+	if optsCopy.Intermediates == nil && len(req.TLS.PeerCertificates) > 1 {
+		optsCopy.Intermediates = x509.NewCertPool()
+		for _, intermediate := range req.TLS.PeerCertificates[1:] {
+			optsCopy.Intermediates.AddCert(intermediate)
+		}
+	}
+
+	remaining := req.TLS.PeerCertificates[0].NotAfter.Sub(time.Now())
+	clientCertificateExpirationHistogram.WithContext(req.Context()).Observe(remaining.Seconds())
+	chains, err := req.TLS.PeerCertificates[0].Verify(optsCopy)
+	if err != nil {
+		return nil, false, fmt.Errorf(
+			"verifying certificate %s failed: %w",
+			certificateIdentifier(req.TLS.PeerCertificates[0]),
+			err,
+		)
+	}
+
+	var errlist []error
+	for _, chain := range chains {
+		user, ok, err := a.user.User(chain)
+		if err != nil {
+			errlist = append(errlist, err)
+			continue
+		}
+
+		if ok {
+			return user, ok, err
+		}
+	}
+	return nil, false, utilerrors.NewAggregate(errlist)
+}
+
+// Verifier implements request.Authenticator by verifying a client cert on the request, then delegating to the wrapped auth
+type Verifier struct {
+	verifyOptionsFn VerifyOptionFunc
+	auth            authenticator.Request
+
+	// allowedCommonNames contains the common names which a verified certificate is allowed to have.
+	// If empty, all verified certificates are allowed.
+	allowedCommonNames StringSliceProvider
+}
+
+// NewVerifier create a request.Authenticator by verifying a client cert on the request, then delegating to the wrapped auth
+func NewVerifier(opts x509.VerifyOptions, auth authenticator.Request, allowedCommonNames sets.String) authenticator.Request {
+	return NewDynamicCAVerifier(StaticVerifierFn(opts), auth, StaticStringSlice(allowedCommonNames.List()))
+}
+
+// NewDynamicCAVerifier create a request.Authenticator by verifying a client cert on the request, then delegating to the wrapped auth
+func NewDynamicCAVerifier(verifyOptionsFn VerifyOptionFunc, auth authenticator.Request, allowedCommonNames StringSliceProvider) authenticator.Request {
+	return &Verifier{verifyOptionsFn, auth, allowedCommonNames}
+}
+
+// AuthenticateRequest verifies the presented client certificate, then delegates to the wrapped auth
+func (a *Verifier) AuthenticateRequest(req *http.Request) (*authenticator.Response, bool, error) {
+	if req.TLS == nil || len(req.TLS.PeerCertificates) == 0 {
+		return nil, false, nil
+	}
+
+	// Use intermediates, if provided
+	optsCopy, ok := a.verifyOptionsFn()
+	// if there are intentionally no verify options, then we cannot authenticate this request
+	if !ok {
+		return nil, false, nil
+	}
+	if optsCopy.Intermediates == nil && len(req.TLS.PeerCertificates) > 1 {
+		optsCopy.Intermediates = x509.NewCertPool()
+		for _, intermediate := range req.TLS.PeerCertificates[1:] {
+			optsCopy.Intermediates.AddCert(intermediate)
+		}
+	}
+
+	if _, err := req.TLS.PeerCertificates[0].Verify(optsCopy); err != nil {
+		return nil, false, err
+	}
+	if err := a.verifySubject(req.TLS.PeerCertificates[0].Subject); err != nil {
+		return nil, false, err
+	}
+	return a.auth.AuthenticateRequest(req)
+}
+
+func (a *Verifier) verifySubject(subject pkix.Name) error {
+	// No CN restrictions
+	if len(a.allowedCommonNames.Value()) == 0 {
+		return nil
+	}
+	// Enforce CN restrictions
+	for _, allowedCommonName := range a.allowedCommonNames.Value() {
+		if allowedCommonName == subject.CommonName {
+			return nil
+		}
+	}
+	return fmt.Errorf("x509: subject with cn=%s is not in the allowed list", subject.CommonName)
+}
+
+// DefaultVerifyOptions returns VerifyOptions that use the system root certificates, current time,
+// and requires certificates to be valid for client auth (x509.ExtKeyUsageClientAuth)
+func DefaultVerifyOptions() x509.VerifyOptions {
+	return x509.VerifyOptions{
+		KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
+	}
+}
+
+// CommonNameUserConversion builds user info from a certificate chain using the subject's CommonName
+var CommonNameUserConversion = UserConversionFunc(func(chain []*x509.Certificate) (*authenticator.Response, bool, error) {
+	if len(chain[0].Subject.CommonName) == 0 {
+		return nil, false, nil
+	}
+	return &authenticator.Response{
+		User: &user.DefaultInfo{
+			Name:   chain[0].Subject.CommonName,
+			Groups: chain[0].Subject.Organization,
+		},
+	}, true, nil
+})