pkg/registry: add rbac storage

pkg/registry/cachesize/cachesize.go

@@ -28,6 +28,8 @@ import (
 type Resource string
 
 const (
+	ClusterRoles             Resource = "clusterroles"
+	ClusterRoleBindings      Resource = "clusterrolebindings"
 	Controllers              Resource = "controllers"
 	Daemonsets               Resource = "daemonsets"
 	Deployments              Resource = "deployments"
@@ -48,6 +50,8 @@ const (
 	Replicasets              Resource = "replicasets"
 	ResourceQuotas           Resource = "resourcequotas"
 	ScheduledJobs            Resource = "scheduledjobs"
+	Roles                    Resource = "roles"
+	RoleBindings             Resource = "rolebindings"
 	Secrets                  Resource = "secrets"
 	ServiceAccounts          Resource = "serviceaccounts"
 	Services                 Resource = "services"
@@ -57,6 +61,8 @@ var watchCacheSizes map[Resource]int
 
 func init() {
 	watchCacheSizes = make(map[Resource]int)
+	watchCacheSizes[ClusterRoles] = 100
+	watchCacheSizes[ClusterRoleBindings] = 100
 	watchCacheSizes[Controllers] = 100
 	watchCacheSizes[Daemonsets] = 100
 	watchCacheSizes[Deployments] = 100
@@ -77,6 +83,8 @@ func init() {
 	watchCacheSizes[Replicasets] = 100
 	watchCacheSizes[ResourceQuotas] = 100
 	watchCacheSizes[ScheduledJobs] = 100
+	watchCacheSizes[Roles] = 100
+	watchCacheSizes[RoleBindings] = 100
 	watchCacheSizes[Secrets] = 100
 	watchCacheSizes[ServiceAccounts] = 100
 	watchCacheSizes[Services] = 100

pkg/registry/clusterrole/doc.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 certificates provides Registry interface and its RESTStorage
+// implementation for storing ClusterRole objects.
+package clusterrole

pkg/registry/clusterrole/etcd/etcd.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 etcd
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/labels"
+	"k8s.io/kubernetes/pkg/registry/cachesize"
+	"k8s.io/kubernetes/pkg/registry/clusterrole"
+	"k8s.io/kubernetes/pkg/registry/generic"
+	"k8s.io/kubernetes/pkg/registry/generic/registry"
+	"k8s.io/kubernetes/pkg/runtime"
+)
+
+// REST implements a RESTStorage for ClusterRole against etcd
+type REST struct {
+	*registry.Store
+}
+
+// NewREST returns a RESTStorage object that will work against ClusterRole objects.
+func NewREST(opts generic.RESTOptions) *REST {
+	prefix := "/clusterroles"
+
+	newListFunc := func() runtime.Object { return &rbac.ClusterRoleList{} }
+	storageInterface := opts.Decorator(
+		opts.Storage,
+		cachesize.GetWatchCacheSizeByResource(cachesize.ClusterRoles),
+		&rbac.ClusterRole{},
+		prefix,
+		clusterrole.Strategy,
+		newListFunc,
+	)
+
+	store := &registry.Store{
+		NewFunc:     func() runtime.Object { return &rbac.ClusterRole{} },
+		NewListFunc: newListFunc,
+		KeyRootFunc: func(ctx api.Context) string {
+			return registry.NamespaceKeyRootFunc(ctx, prefix)
+		},
+		KeyFunc: func(ctx api.Context, id string) (string, error) {
+			return registry.NoNamespaceKeyFunc(ctx, prefix, id)
+		},
+		ObjectNameFunc: func(obj runtime.Object) (string, error) {
+			return obj.(*rbac.ClusterRole).Name, nil
+		},
+		PredicateFunc: func(label labels.Selector, field fields.Selector) generic.Matcher {
+			return clusterrole.Matcher(label, field)
+		},
+		QualifiedResource:       rbac.Resource("clusterroles"),
+		DeleteCollectionWorkers: opts.DeleteCollectionWorkers,
+
+		CreateStrategy: clusterrole.Strategy,
+		UpdateStrategy: clusterrole.Strategy,
+		DeleteStrategy: clusterrole.Strategy,
+
+		Storage: storageInterface,
+	}
+
+	return &REST{store}
+}

pkg/registry/clusterrole/policybased/storage.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 policybased implements a standard storage for ClusterRole that prevents privilege escalation.
+package policybased
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/errors"
+	"k8s.io/kubernetes/pkg/api/rest"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/pkg/apis/rbac/validation"
+	"k8s.io/kubernetes/pkg/runtime"
+)
+
+var groupResource = rbac.Resource("clusterroles")
+
+type Storage struct {
+	rest.StandardStorage
+
+	ruleResolver validation.AuthorizationRuleResolver
+
+	// user which skips privilege escalation checks
+	superUser string
+}
+
+func NewStorage(s rest.StandardStorage, ruleResolver validation.AuthorizationRuleResolver, superUser string) *Storage {
+	return &Storage{s, ruleResolver, superUser}
+}
+
+func (s *Storage) Create(ctx api.Context, obj runtime.Object) (runtime.Object, error) {
+	if user, ok := api.UserFrom(ctx); ok {
+		if s.superUser != "" && user.GetName() == s.superUser {
+			return s.StandardStorage.Create(ctx, obj)
+		}
+	}
+
+	clusterRole := obj.(*rbac.ClusterRole)
+	rules := clusterRole.Rules
+	if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
+		return nil, errors.NewForbidden(groupResource, clusterRole.Name, err)
+	}
+	return s.StandardStorage.Create(ctx, obj)
+}
+
+func (s *Storage) Update(ctx api.Context, name string, obj rest.UpdatedObjectInfo) (runtime.Object, bool, error) {
+	if user, ok := api.UserFrom(ctx); ok {
+		if s.superUser != "" && user.GetName() == s.superUser {
+			return s.StandardStorage.Update(ctx, name, obj)
+		}
+	}
+
+	nonEscalatingInfo := wrapUpdatedObjectInfo(obj, func(ctx api.Context, obj runtime.Object, oldObj runtime.Object) (runtime.Object, error) {
+		clusterRole := obj.(*rbac.ClusterRole)
+
+		rules := clusterRole.Rules
+		if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
+			return nil, errors.NewForbidden(groupResource, clusterRole.Name, err)
+		}
+		return obj, nil
+	})
+
+	return s.StandardStorage.Update(ctx, name, nonEscalatingInfo)
+}
+
+// TODO(ericchiang): This logic is copied from #26240. Replace with once that PR is merged into master.
+type wrappedUpdatedObjectInfo struct {
+	objInfo rest.UpdatedObjectInfo
+
+	transformFunc rest.TransformFunc
+}
+
+func wrapUpdatedObjectInfo(objInfo rest.UpdatedObjectInfo, transformFunc rest.TransformFunc) rest.UpdatedObjectInfo {
+	return &wrappedUpdatedObjectInfo{objInfo, transformFunc}
+}
+
+func (i *wrappedUpdatedObjectInfo) Preconditions() *api.Preconditions {
+	return i.objInfo.Preconditions()
+}
+
+func (i *wrappedUpdatedObjectInfo) UpdatedObject(ctx api.Context, oldObj runtime.Object) (runtime.Object, error) {
+	obj, err := i.objInfo.UpdatedObject(ctx, oldObj)
+	if err != nil {
+		return obj, err
+	}
+	return i.transformFunc(ctx, obj, oldObj)
+}

pkg/registry/clusterrole/registry.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 clusterrole
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/rest"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/pkg/watch"
+)
+
+// Registry is an interface for things that know how to store ClusterRoles.
+type Registry interface {
+	ListClusterRoles(ctx api.Context, options *api.ListOptions) (*rbac.ClusterRoleList, error)
+	CreateClusterRole(ctx api.Context, clusterRole *rbac.ClusterRole) error
+	UpdateClusterRole(ctx api.Context, clusterRole *rbac.ClusterRole) error
+	GetClusterRole(ctx api.Context, name string) (*rbac.ClusterRole, error)
+	DeleteClusterRole(ctx api.Context, name string) error
+	WatchClusterRoles(ctx api.Context, options *api.ListOptions) (watch.Interface, error)
+}
+
+// storage puts strong typing around storage calls
+type storage struct {
+	rest.StandardStorage
+}
+
+// NewRegistry returns a new Registry interface for the given Storage. Any mismatched
+// types will panic.
+func NewRegistry(s rest.StandardStorage) Registry {
+	return &storage{s}
+}
+
+func (s *storage) ListClusterRoles(ctx api.Context, options *api.ListOptions) (*rbac.ClusterRoleList, error) {
+	obj, err := s.List(ctx, options)
+	if err != nil {
+		return nil, err
+	}
+
+	return obj.(*rbac.ClusterRoleList), nil
+}
+
+func (s *storage) CreateClusterRole(ctx api.Context, clusterRole *rbac.ClusterRole) error {
+	_, err := s.Create(ctx, clusterRole)
+	return err
+}
+
+func (s *storage) UpdateClusterRole(ctx api.Context, clusterRole *rbac.ClusterRole) error {
+	_, _, err := s.Update(ctx, clusterRole.Name, rest.DefaultUpdatedObjectInfo(clusterRole, api.Scheme))
+	return err
+}
+
+func (s *storage) WatchClusterRoles(ctx api.Context, options *api.ListOptions) (watch.Interface, error) {
+	return s.Watch(ctx, options)
+}
+
+func (s *storage) GetClusterRole(ctx api.Context, name string) (*rbac.ClusterRole, error) {
+	obj, err := s.Get(ctx, name)
+	if err != nil {
+		return nil, err
+	}
+	return obj.(*rbac.ClusterRole), nil
+}
+
+func (s *storage) DeleteClusterRole(ctx api.Context, name string) error {
+	_, err := s.Delete(ctx, name, nil)
+	return err
+}

pkg/registry/clusterrole/strategy.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 clusterrole
+
+import (
+	"fmt"
+
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/rest"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/pkg/apis/rbac/validation"
+	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/labels"
+	"k8s.io/kubernetes/pkg/registry/generic"
+	"k8s.io/kubernetes/pkg/runtime"
+	"k8s.io/kubernetes/pkg/util/validation/field"
+)
+
+// strategy implements behavior for ClusterRoles
+type strategy struct {
+	runtime.ObjectTyper
+	api.NameGenerator
+}
+
+// strategy is the default logic that applies when creating and updating
+// ClusterRole objects.
+var Strategy = strategy{api.Scheme, api.SimpleNameGenerator}
+
+// Strategy should implement rest.RESTCreateStrategy
+var _ rest.RESTCreateStrategy = Strategy
+
+// Strategy should implement rest.RESTUpdateStrategy
+var _ rest.RESTUpdateStrategy = Strategy
+
+// NamespaceScoped is true for ClusterRoles.
+func (strategy) NamespaceScoped() bool {
+	return false
+}
+
+// AllowCreateOnUpdate is true for ClusterRoles.
+func (strategy) AllowCreateOnUpdate() bool {
+	return true
+}
+
+// PrepareForCreate clears fields that are not allowed to be set by end users
+// on creation.
+func (strategy) PrepareForCreate(obj runtime.Object) {
+	_ = obj.(*rbac.ClusterRole)
+}
+
+// PrepareForUpdate clears fields that are not allowed to be set by end users on update.
+func (strategy) PrepareForUpdate(obj, old runtime.Object) {
+	newClusterRole := obj.(*rbac.ClusterRole)
+	oldClusterRole := old.(*rbac.ClusterRole)
+
+	_, _ = newClusterRole, oldClusterRole
+}
+
+// Validate validates a new ClusterRole. Validation must check for a correct signature.
+func (strategy) Validate(ctx api.Context, obj runtime.Object) field.ErrorList {
+	clusterRole := obj.(*rbac.ClusterRole)
+	return validation.ValidateClusterRole(clusterRole)
+}
+
+// Canonicalize normalizes the object after validation.
+func (strategy) Canonicalize(obj runtime.Object) {
+	_ = obj.(*rbac.ClusterRole)
+}
+
+// ValidateUpdate is the default update validation for an end user.
+func (strategy) ValidateUpdate(ctx api.Context, obj, old runtime.Object) field.ErrorList {
+	newObj := obj.(*rbac.ClusterRole)
+	errorList := validation.ValidateClusterRole(newObj)
+	return append(errorList, validation.ValidateClusterRoleUpdate(newObj, old.(*rbac.ClusterRole))...)
+}
+
+// If AllowUnconditionalUpdate() is true and the object specified by
+// the user does not have a resource version, then generic Update()
+// populates it with the latest version. Else, it checks that the
+// version specified by the user matches the version of latest etcd
+// object.
+func (strategy) AllowUnconditionalUpdate() bool {
+	return true
+}
+
+func (s strategy) Export(obj runtime.Object, exact bool) error {
+	return nil
+}
+
+// Matcher returns a generic matcher for a given label and field selector.
+func Matcher(label labels.Selector, field fields.Selector) generic.Matcher {
+	return generic.MatcherFunc(func(obj runtime.Object) (bool, error) {
+		sa, ok := obj.(*rbac.ClusterRole)
+		if !ok {
+			return false, fmt.Errorf("not a ClusterRole")
+		}
+		fields := SelectableFields(sa)
+		return label.Matches(labels.Set(sa.Labels)) && field.Matches(fields), nil
+	})
+}
+
+// SelectableFields returns a label set that can be used for filter selection
+func SelectableFields(obj *rbac.ClusterRole) labels.Set {
+	return labels.Set{}
+}

pkg/registry/clusterrolebinding/doc.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 certificates provides Registry interface and its RESTStorage
+// implementation for storing ClusterRoleBinding objects.
+package clusterrolebinding

pkg/registry/clusterrolebinding/etcd/etcd.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 etcd
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/labels"
+	"k8s.io/kubernetes/pkg/registry/cachesize"
+	"k8s.io/kubernetes/pkg/registry/clusterrolebinding"
+	"k8s.io/kubernetes/pkg/registry/generic"
+	"k8s.io/kubernetes/pkg/registry/generic/registry"
+	"k8s.io/kubernetes/pkg/runtime"
+)
+
+// REST implements a RESTStorage for ClusterRoleBinding against etcd
+type REST struct {
+	*registry.Store
+}
+
+// NewREST returns a RESTStorage object that will work against ClusterRoleBinding objects.
+func NewREST(opts generic.RESTOptions) *REST {
+	prefix := "/clusterrolebindings"
+
+	newListFunc := func() runtime.Object { return &rbac.ClusterRoleBindingList{} }
+	storageInterface := opts.Decorator(
+		opts.Storage,
+		cachesize.GetWatchCacheSizeByResource(cachesize.ClusterRoleBindings),
+		&rbac.ClusterRoleBinding{},
+		prefix,
+		clusterrolebinding.Strategy,
+		newListFunc,
+	)
+
+	store := &registry.Store{
+		NewFunc:     func() runtime.Object { return &rbac.ClusterRoleBinding{} },
+		NewListFunc: newListFunc,
+		KeyRootFunc: func(ctx api.Context) string {
+			return registry.NamespaceKeyRootFunc(ctx, prefix)
+		},
+		KeyFunc: func(ctx api.Context, id string) (string, error) {
+			return registry.NoNamespaceKeyFunc(ctx, prefix, id)
+		},
+		ObjectNameFunc: func(obj runtime.Object) (string, error) {
+			return obj.(*rbac.ClusterRoleBinding).Name, nil
+		},
+		PredicateFunc: func(label labels.Selector, field fields.Selector) generic.Matcher {
+			return clusterrolebinding.Matcher(label, field)
+		},
+		QualifiedResource:       rbac.Resource("clusterrolebindings"),
+		DeleteCollectionWorkers: opts.DeleteCollectionWorkers,
+
+		CreateStrategy: clusterrolebinding.Strategy,
+		UpdateStrategy: clusterrolebinding.Strategy,
+		DeleteStrategy: clusterrolebinding.Strategy,
+
+		Storage: storageInterface,
+	}
+
+	return &REST{store}
+}

pkg/registry/clusterrolebinding/policybased/storage.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 policybased implements a standard storage for ClusterRoleBinding that prevents privilege escalation.
+package policybased
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/errors"
+	"k8s.io/kubernetes/pkg/api/rest"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/pkg/apis/rbac/validation"
+	"k8s.io/kubernetes/pkg/runtime"
+)
+
+var groupResource = rbac.Resource("clusterrolebindings")
+
+type Storage struct {
+	rest.StandardStorage
+
+	ruleResolver validation.AuthorizationRuleResolver
+
+	// user which skips privilege escalation checks
+	superUser string
+}
+
+func NewStorage(s rest.StandardStorage, ruleResolver validation.AuthorizationRuleResolver, superUser string) *Storage {
+	return &Storage{s, ruleResolver, superUser}
+}
+
+func (s *Storage) Create(ctx api.Context, obj runtime.Object) (runtime.Object, error) {
+	if user, ok := api.UserFrom(ctx); ok {
+		if s.superUser != "" && user.GetName() == s.superUser {
+			return s.StandardStorage.Create(ctx, obj)
+		}
+	}
+
+	clusterRoleBinding := obj.(*rbac.ClusterRoleBinding)
+	rules, err := s.ruleResolver.GetRoleReferenceRules(ctx, clusterRoleBinding.RoleRef, clusterRoleBinding.Namespace)
+	if err != nil {
+		return nil, err
+	}
+	if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
+		return nil, errors.NewForbidden(groupResource, clusterRoleBinding.Name, err)
+	}
+	return s.StandardStorage.Create(ctx, obj)
+}
+
+func (s *Storage) Update(ctx api.Context, name string, obj rest.UpdatedObjectInfo) (runtime.Object, bool, error) {
+	if user, ok := api.UserFrom(ctx); ok {
+		if s.superUser != "" && user.GetName() == s.superUser {
+			return s.StandardStorage.Update(ctx, name, obj)
+		}
+	}
+
+	nonEscalatingInfo := wrapUpdatedObjectInfo(obj, func(ctx api.Context, obj runtime.Object, oldObj runtime.Object) (runtime.Object, error) {
+		clusterRoleBinding := obj.(*rbac.ClusterRoleBinding)
+
+		rules, err := s.ruleResolver.GetRoleReferenceRules(ctx, clusterRoleBinding.RoleRef, clusterRoleBinding.Namespace)
+		if err != nil {
+			return nil, err
+		}
+		if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
+			return nil, errors.NewForbidden(groupResource, clusterRoleBinding.Name, err)
+		}
+		return obj, nil
+	})
+
+	return s.StandardStorage.Update(ctx, name, nonEscalatingInfo)
+}
+
+// TODO(ericchiang): This logic is copied from #26240. Replace with once that PR is merged into master.
+type wrappedUpdatedObjectInfo struct {
+	objInfo rest.UpdatedObjectInfo
+
+	transformFunc rest.TransformFunc
+}
+
+func wrapUpdatedObjectInfo(objInfo rest.UpdatedObjectInfo, transformFunc rest.TransformFunc) rest.UpdatedObjectInfo {
+	return &wrappedUpdatedObjectInfo{objInfo, transformFunc}
+}
+
+func (i *wrappedUpdatedObjectInfo) Preconditions() *api.Preconditions {
+	return i.objInfo.Preconditions()
+}
+
+func (i *wrappedUpdatedObjectInfo) UpdatedObject(ctx api.Context, oldObj runtime.Object) (runtime.Object, error) {
+	obj, err := i.objInfo.UpdatedObject(ctx, oldObj)
+	if err != nil {
+		return obj, err
+	}
+	return i.transformFunc(ctx, obj, oldObj)
+}

pkg/registry/clusterrolebinding/registry.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 clusterrolebinding
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/rest"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/pkg/watch"
+)
+
+// Registry is an interface for things that know how to store ClusterRoleBindings.
+type Registry interface {
+	ListClusterRoleBindings(ctx api.Context, options *api.ListOptions) (*rbac.ClusterRoleBindingList, error)
+	CreateClusterRoleBinding(ctx api.Context, clusterRoleBinding *rbac.ClusterRoleBinding) error
+	UpdateClusterRoleBinding(ctx api.Context, clusterRoleBinding *rbac.ClusterRoleBinding) error
+	GetClusterRoleBinding(ctx api.Context, name string) (*rbac.ClusterRoleBinding, error)
+	DeleteClusterRoleBinding(ctx api.Context, name string) error
+	WatchClusterRoleBindings(ctx api.Context, options *api.ListOptions) (watch.Interface, error)
+}
+
+// storage puts strong typing around storage calls
+type storage struct {
+	rest.StandardStorage
+}
+
+// NewRegistry returns a new Registry interface for the given Storage. Any mismatched
+// types will panic.
+func NewRegistry(s rest.StandardStorage) Registry {
+	return &storage{s}
+}
+
+func (s *storage) ListClusterRoleBindings(ctx api.Context, options *api.ListOptions) (*rbac.ClusterRoleBindingList, error) {
+	obj, err := s.List(ctx, options)
+	if err != nil {
+		return nil, err
+	}
+
+	return obj.(*rbac.ClusterRoleBindingList), nil
+}
+
+func (s *storage) CreateClusterRoleBinding(ctx api.Context, clusterRoleBinding *rbac.ClusterRoleBinding) error {
+	_, err := s.Create(ctx, clusterRoleBinding)
+	return err
+}
+
+func (s *storage) UpdateClusterRoleBinding(ctx api.Context, clusterRoleBinding *rbac.ClusterRoleBinding) error {
+	_, _, err := s.Update(ctx, clusterRoleBinding.Name, rest.DefaultUpdatedObjectInfo(clusterRoleBinding, api.Scheme))
+	return err
+}
+
+func (s *storage) WatchClusterRoleBindings(ctx api.Context, options *api.ListOptions) (watch.Interface, error) {
+	return s.Watch(ctx, options)
+}
+
+func (s *storage) GetClusterRoleBinding(ctx api.Context, name string) (*rbac.ClusterRoleBinding, error) {
+	obj, err := s.Get(ctx, name)
+	if err != nil {
+		return nil, err
+	}
+	return obj.(*rbac.ClusterRoleBinding), nil
+}
+
+func (s *storage) DeleteClusterRoleBinding(ctx api.Context, name string) error {
+	_, err := s.Delete(ctx, name, nil)
+	return err
+}

pkg/registry/clusterrolebinding/strategy.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 clusterrolebinding
+
+import (
+	"fmt"
+
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/rest"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/pkg/apis/rbac/validation"
+	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/labels"
+	"k8s.io/kubernetes/pkg/registry/generic"
+	"k8s.io/kubernetes/pkg/runtime"
+	"k8s.io/kubernetes/pkg/util/validation/field"
+)
+
+// strategy implements behavior for ClusterRoleBindings
+type strategy struct {
+	runtime.ObjectTyper
+	api.NameGenerator
+}
+
+// strategy is the default logic that applies when creating and updating
+// ClusterRoleBinding objects.
+var Strategy = strategy{api.Scheme, api.SimpleNameGenerator}
+
+// Strategy should implement rest.RESTCreateStrategy
+var _ rest.RESTCreateStrategy = Strategy
+
+// Strategy should implement rest.RESTUpdateStrategy
+var _ rest.RESTUpdateStrategy = Strategy
+
+// NamespaceScoped is true for ClusterRoleBindings.
+func (strategy) NamespaceScoped() bool {
+	return false
+}
+
+// AllowCreateOnUpdate is true for ClusterRoleBindings.
+func (strategy) AllowCreateOnUpdate() bool {
+	return true
+}
+
+// PrepareForCreate clears fields that are not allowed to be set by end users
+// on creation.
+func (strategy) PrepareForCreate(obj runtime.Object) {
+	_ = obj.(*rbac.ClusterRoleBinding)
+}
+
+// PrepareForUpdate clears fields that are not allowed to be set by end users on update.
+func (strategy) PrepareForUpdate(obj, old runtime.Object) {
+	newClusterRoleBinding := obj.(*rbac.ClusterRoleBinding)
+	oldClusterRoleBinding := old.(*rbac.ClusterRoleBinding)
+
+	_, _ = newClusterRoleBinding, oldClusterRoleBinding
+}
+
+// Validate validates a new ClusterRoleBinding. Validation must check for a correct signature.
+func (strategy) Validate(ctx api.Context, obj runtime.Object) field.ErrorList {
+	clusterRoleBinding := obj.(*rbac.ClusterRoleBinding)
+	return validation.ValidateClusterRoleBinding(clusterRoleBinding)
+}
+
+// Canonicalize normalizes the object after validation.
+func (strategy) Canonicalize(obj runtime.Object) {
+	_ = obj.(*rbac.ClusterRoleBinding)
+}
+
+// ValidateUpdate is the default update validation for an end user.
+func (strategy) ValidateUpdate(ctx api.Context, obj, old runtime.Object) field.ErrorList {
+	newObj := obj.(*rbac.ClusterRoleBinding)
+	errorList := validation.ValidateClusterRoleBinding(newObj)
+	return append(errorList, validation.ValidateClusterRoleBindingUpdate(newObj, old.(*rbac.ClusterRoleBinding))...)
+}
+
+// If AllowUnconditionalUpdate() is true and the object specified by
+// the user does not have a resource version, then generic Update()
+// populates it with the latest version. Else, it checks that the
+// version specified by the user matches the version of latest etcd
+// object.
+func (strategy) AllowUnconditionalUpdate() bool {
+	return true
+}
+
+func (s strategy) Export(obj runtime.Object, exact bool) error {
+	return nil
+}
+
+// Matcher returns a generic matcher for a given label and field selector.
+func Matcher(label labels.Selector, field fields.Selector) generic.Matcher {
+	return generic.MatcherFunc(func(obj runtime.Object) (bool, error) {
+		sa, ok := obj.(*rbac.ClusterRoleBinding)
+		if !ok {
+			return false, fmt.Errorf("not a ClusterRoleBinding")
+		}
+		fields := SelectableFields(sa)
+		return label.Matches(labels.Set(sa.Labels)) && field.Matches(fields), nil
+	})
+}
+
+// SelectableFields returns a label set that can be used for filter selection
+func SelectableFields(obj *rbac.ClusterRoleBinding) labels.Set {
+	return labels.Set{}
+}

pkg/registry/role/doc.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 certificates provides Registry interface and its RESTStorage
+// implementation for storing Role objects.
+package role

pkg/registry/role/etcd/etcd.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 etcd
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/labels"
+	"k8s.io/kubernetes/pkg/registry/cachesize"
+	"k8s.io/kubernetes/pkg/registry/generic"
+	"k8s.io/kubernetes/pkg/registry/generic/registry"
+	"k8s.io/kubernetes/pkg/registry/role"
+	"k8s.io/kubernetes/pkg/runtime"
+)
+
+// REST implements a RESTStorage for Role against etcd
+type REST struct {
+	*registry.Store
+}
+
+// NewREST returns a RESTStorage object that will work against Role objects.
+func NewREST(opts generic.RESTOptions) *REST {
+	prefix := "/roles"
+
+	newListFunc := func() runtime.Object { return &rbac.RoleList{} }
+	storageInterface := opts.Decorator(
+		opts.Storage,
+		cachesize.GetWatchCacheSizeByResource(cachesize.Roles),
+		&rbac.Role{},
+		prefix,
+		role.Strategy,
+		newListFunc,
+	)
+
+	store := &registry.Store{
+		NewFunc:     func() runtime.Object { return &rbac.Role{} },
+		NewListFunc: newListFunc,
+		KeyRootFunc: func(ctx api.Context) string {
+			return registry.NamespaceKeyRootFunc(ctx, prefix)
+		},
+		KeyFunc: func(ctx api.Context, id string) (string, error) {
+			return registry.NamespaceKeyFunc(ctx, prefix, id)
+		},
+		ObjectNameFunc: func(obj runtime.Object) (string, error) {
+			return obj.(*rbac.Role).Name, nil
+		},
+		PredicateFunc: func(label labels.Selector, field fields.Selector) generic.Matcher {
+			return role.Matcher(label, field)
+		},
+		QualifiedResource:       rbac.Resource("roles"),
+		DeleteCollectionWorkers: opts.DeleteCollectionWorkers,
+
+		CreateStrategy: role.Strategy,
+		UpdateStrategy: role.Strategy,
+		DeleteStrategy: role.Strategy,
+
+		Storage: storageInterface,
+	}
+
+	return &REST{store}
+}

pkg/registry/role/policybased/storage.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 policybased implements a standard storage for Role that prevents privilege escalation.
+package policybased
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/errors"
+	"k8s.io/kubernetes/pkg/api/rest"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/pkg/apis/rbac/validation"
+	"k8s.io/kubernetes/pkg/runtime"
+)
+
+var groupResource = rbac.Resource("roles")
+
+type Storage struct {
+	rest.StandardStorage
+
+	ruleResolver validation.AuthorizationRuleResolver
+
+	// user which skips privilege escalation checks
+	superUser string
+}
+
+func NewStorage(s rest.StandardStorage, ruleResolver validation.AuthorizationRuleResolver, superUser string) *Storage {
+	return &Storage{s, ruleResolver, superUser}
+}
+
+func (s *Storage) Create(ctx api.Context, obj runtime.Object) (runtime.Object, error) {
+	if user, ok := api.UserFrom(ctx); ok {
+		if s.superUser != "" && user.GetName() == s.superUser {
+			return s.StandardStorage.Create(ctx, obj)
+		}
+	}
+
+	role := obj.(*rbac.Role)
+	rules := role.Rules
+	if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
+		return nil, errors.NewForbidden(groupResource, role.Name, err)
+	}
+	return s.StandardStorage.Create(ctx, obj)
+}
+
+func (s *Storage) Update(ctx api.Context, name string, obj rest.UpdatedObjectInfo) (runtime.Object, bool, error) {
+	if user, ok := api.UserFrom(ctx); ok {
+		if s.superUser != "" && user.GetName() == s.superUser {
+			return s.StandardStorage.Update(ctx, name, obj)
+		}
+	}
+
+	nonEscalatingInfo := wrapUpdatedObjectInfo(obj, func(ctx api.Context, obj runtime.Object, oldObj runtime.Object) (runtime.Object, error) {
+		role := obj.(*rbac.Role)
+
+		rules := role.Rules
+		if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
+			return nil, errors.NewForbidden(groupResource, role.Name, err)
+		}
+		return obj, nil
+	})
+
+	return s.StandardStorage.Update(ctx, name, nonEscalatingInfo)
+}
+
+// TODO(ericchiang): This logic is copied from #26240. Replace with once that PR is merged into master.
+type wrappedUpdatedObjectInfo struct {
+	objInfo rest.UpdatedObjectInfo
+
+	transformFunc rest.TransformFunc
+}
+
+func wrapUpdatedObjectInfo(objInfo rest.UpdatedObjectInfo, transformFunc rest.TransformFunc) rest.UpdatedObjectInfo {
+	return &wrappedUpdatedObjectInfo{objInfo, transformFunc}
+}
+
+func (i *wrappedUpdatedObjectInfo) Preconditions() *api.Preconditions {
+	return i.objInfo.Preconditions()
+}
+
+func (i *wrappedUpdatedObjectInfo) UpdatedObject(ctx api.Context, oldObj runtime.Object) (runtime.Object, error) {
+	obj, err := i.objInfo.UpdatedObject(ctx, oldObj)
+	if err != nil {
+		return obj, err
+	}
+	return i.transformFunc(ctx, obj, oldObj)
+}

pkg/registry/role/registry.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 role
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/rest"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/pkg/watch"
+)
+
+// Registry is an interface for things that know how to store Roles.
+type Registry interface {
+	ListRoles(ctx api.Context, options *api.ListOptions) (*rbac.RoleList, error)
+	CreateRole(ctx api.Context, role *rbac.Role) error
+	UpdateRole(ctx api.Context, role *rbac.Role) error
+	GetRole(ctx api.Context, name string) (*rbac.Role, error)
+	DeleteRole(ctx api.Context, name string) error
+	WatchRoles(ctx api.Context, options *api.ListOptions) (watch.Interface, error)
+}
+
+// storage puts strong typing around storage calls
+type storage struct {
+	rest.StandardStorage
+}
+
+// NewRegistry returns a new Registry interface for the given Storage. Any mismatched
+// types will panic.
+func NewRegistry(s rest.StandardStorage) Registry {
+	return &storage{s}
+}
+
+func (s *storage) ListRoles(ctx api.Context, options *api.ListOptions) (*rbac.RoleList, error) {
+	obj, err := s.List(ctx, options)
+	if err != nil {
+		return nil, err
+	}
+
+	return obj.(*rbac.RoleList), nil
+}
+
+func (s *storage) CreateRole(ctx api.Context, role *rbac.Role) error {
+	_, err := s.Create(ctx, role)
+	return err
+}
+
+func (s *storage) UpdateRole(ctx api.Context, role *rbac.Role) error {
+	_, _, err := s.Update(ctx, role.Name, rest.DefaultUpdatedObjectInfo(role, api.Scheme))
+	return err
+}
+
+func (s *storage) WatchRoles(ctx api.Context, options *api.ListOptions) (watch.Interface, error) {
+	return s.Watch(ctx, options)
+}
+
+func (s *storage) GetRole(ctx api.Context, name string) (*rbac.Role, error) {
+	obj, err := s.Get(ctx, name)
+	if err != nil {
+		return nil, err
+	}
+	return obj.(*rbac.Role), nil
+}
+
+func (s *storage) DeleteRole(ctx api.Context, name string) error {
+	_, err := s.Delete(ctx, name, nil)
+	return err
+}

pkg/registry/role/strategy.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 role
+
+import (
+	"fmt"
+
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/rest"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/pkg/apis/rbac/validation"
+	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/labels"
+	"k8s.io/kubernetes/pkg/registry/generic"
+	"k8s.io/kubernetes/pkg/runtime"
+	"k8s.io/kubernetes/pkg/util/validation/field"
+)
+
+// strategy implements behavior for Roles
+type strategy struct {
+	runtime.ObjectTyper
+	api.NameGenerator
+}
+
+// strategy is the default logic that applies when creating and updating
+// Role objects.
+var Strategy = strategy{api.Scheme, api.SimpleNameGenerator}
+
+// Strategy should implement rest.RESTCreateStrategy
+var _ rest.RESTCreateStrategy = Strategy
+
+// Strategy should implement rest.RESTUpdateStrategy
+var _ rest.RESTUpdateStrategy = Strategy
+
+// NamespaceScoped is true for Roles.
+func (strategy) NamespaceScoped() bool {
+	return true
+}
+
+// AllowCreateOnUpdate is true for Roles.
+func (strategy) AllowCreateOnUpdate() bool {
+	return true
+}
+
+// PrepareForCreate clears fields that are not allowed to be set by end users
+// on creation.
+func (strategy) PrepareForCreate(obj runtime.Object) {
+	_ = obj.(*rbac.Role)
+}
+
+// PrepareForUpdate clears fields that are not allowed to be set by end users on update.
+func (strategy) PrepareForUpdate(obj, old runtime.Object) {
+	newRole := obj.(*rbac.Role)
+	oldRole := old.(*rbac.Role)
+
+	_, _ = newRole, oldRole
+}
+
+// Validate validates a new Role. Validation must check for a correct signature.
+func (strategy) Validate(ctx api.Context, obj runtime.Object) field.ErrorList {
+	role := obj.(*rbac.Role)
+	return validation.ValidateRole(role)
+}
+
+// Canonicalize normalizes the object after validation.
+func (strategy) Canonicalize(obj runtime.Object) {
+	_ = obj.(*rbac.Role)
+}
+
+// ValidateUpdate is the default update validation for an end user.
+func (strategy) ValidateUpdate(ctx api.Context, obj, old runtime.Object) field.ErrorList {
+	newObj := obj.(*rbac.Role)
+	errorList := validation.ValidateRole(newObj)
+	return append(errorList, validation.ValidateRoleUpdate(newObj, old.(*rbac.Role))...)
+}
+
+// If AllowUnconditionalUpdate() is true and the object specified by
+// the user does not have a resource version, then generic Update()
+// populates it with the latest version. Else, it checks that the
+// version specified by the user matches the version of latest etcd
+// object.
+func (strategy) AllowUnconditionalUpdate() bool {
+	return true
+}
+
+func (s strategy) Export(obj runtime.Object, exact bool) error {
+	return nil
+}
+
+// Matcher returns a generic matcher for a given label and field selector.
+func Matcher(label labels.Selector, field fields.Selector) generic.Matcher {
+	return generic.MatcherFunc(func(obj runtime.Object) (bool, error) {
+		sa, ok := obj.(*rbac.Role)
+		if !ok {
+			return false, fmt.Errorf("not a Role")
+		}
+		fields := SelectableFields(sa)
+		return label.Matches(labels.Set(sa.Labels)) && field.Matches(fields), nil
+	})
+}
+
+// SelectableFields returns a label set that can be used for filter selection
+func SelectableFields(obj *rbac.Role) labels.Set {
+	return labels.Set{}
+}

pkg/registry/rolebinding/doc.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 certificates provides Registry interface and its RESTStorage
+// implementation for storing RoleBinding objects.
+package rolebinding

pkg/registry/rolebinding/etcd/etcd.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 etcd
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/labels"
+	"k8s.io/kubernetes/pkg/registry/cachesize"
+	"k8s.io/kubernetes/pkg/registry/generic"
+	"k8s.io/kubernetes/pkg/registry/generic/registry"
+	"k8s.io/kubernetes/pkg/registry/rolebinding"
+	"k8s.io/kubernetes/pkg/runtime"
+)
+
+// REST implements a RESTStorage for RoleBinding against etcd
+type REST struct {
+	*registry.Store
+}
+
+// NewREST returns a RESTStorage object that will work against RoleBinding objects.
+func NewREST(opts generic.RESTOptions) *REST {
+	prefix := "/rolebindings"
+
+	newListFunc := func() runtime.Object { return &rbac.RoleBindingList{} }
+	storageInterface := opts.Decorator(
+		opts.Storage,
+		cachesize.GetWatchCacheSizeByResource(cachesize.RoleBindings),
+		&rbac.RoleBinding{},
+		prefix,
+		rolebinding.Strategy,
+		newListFunc,
+	)
+
+	store := &registry.Store{
+		NewFunc:     func() runtime.Object { return &rbac.RoleBinding{} },
+		NewListFunc: newListFunc,
+		KeyRootFunc: func(ctx api.Context) string {
+			return registry.NamespaceKeyRootFunc(ctx, prefix)
+		},
+		KeyFunc: func(ctx api.Context, id string) (string, error) {
+			return registry.NamespaceKeyFunc(ctx, prefix, id)
+		},
+		ObjectNameFunc: func(obj runtime.Object) (string, error) {
+			return obj.(*rbac.RoleBinding).Name, nil
+		},
+		PredicateFunc: func(label labels.Selector, field fields.Selector) generic.Matcher {
+			return rolebinding.Matcher(label, field)
+		},
+		QualifiedResource:       rbac.Resource("rolebindings"),
+		DeleteCollectionWorkers: opts.DeleteCollectionWorkers,
+
+		CreateStrategy: rolebinding.Strategy,
+		UpdateStrategy: rolebinding.Strategy,
+		DeleteStrategy: rolebinding.Strategy,
+
+		Storage: storageInterface,
+	}
+
+	return &REST{store}
+}

pkg/registry/rolebinding/policybased/storage.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 policybased implements a standard storage for RoleBinding that prevents privilege escalation.
+package policybased
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/errors"
+	"k8s.io/kubernetes/pkg/api/rest"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/pkg/apis/rbac/validation"
+	"k8s.io/kubernetes/pkg/runtime"
+)
+
+var groupResource = rbac.Resource("rolebindings")
+
+type Storage struct {
+	rest.StandardStorage
+
+	ruleResolver validation.AuthorizationRuleResolver
+
+	// user which skips privilege escalation checks
+	superUser string
+}
+
+func NewStorage(s rest.StandardStorage, ruleResolver validation.AuthorizationRuleResolver, superUser string) *Storage {
+	return &Storage{s, ruleResolver, superUser}
+}
+
+func (s *Storage) Create(ctx api.Context, obj runtime.Object) (runtime.Object, error) {
+	if user, ok := api.UserFrom(ctx); ok {
+		if s.superUser != "" && user.GetName() == s.superUser {
+			return s.StandardStorage.Create(ctx, obj)
+		}
+	}
+
+	roleBinding := obj.(*rbac.RoleBinding)
+	rules, err := s.ruleResolver.GetRoleReferenceRules(ctx, roleBinding.RoleRef, roleBinding.Namespace)
+	if err != nil {
+		return nil, err
+	}
+	if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
+		return nil, errors.NewForbidden(groupResource, roleBinding.Name, err)
+	}
+	return s.StandardStorage.Create(ctx, obj)
+}
+
+func (s *Storage) Update(ctx api.Context, name string, obj rest.UpdatedObjectInfo) (runtime.Object, bool, error) {
+	if user, ok := api.UserFrom(ctx); ok {
+		if s.superUser != "" && user.GetName() == s.superUser {
+			return s.StandardStorage.Update(ctx, name, obj)
+		}
+	}
+
+	nonEscalatingInfo := wrapUpdatedObjectInfo(obj, func(ctx api.Context, obj runtime.Object, oldObj runtime.Object) (runtime.Object, error) {
+		roleBinding := obj.(*rbac.RoleBinding)
+
+		rules, err := s.ruleResolver.GetRoleReferenceRules(ctx, roleBinding.RoleRef, roleBinding.Namespace)
+		if err != nil {
+			return nil, err
+		}
+		if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
+			return nil, errors.NewForbidden(groupResource, roleBinding.Name, err)
+		}
+		return obj, nil
+	})
+
+	return s.StandardStorage.Update(ctx, name, nonEscalatingInfo)
+}
+
+// TODO(ericchiang): This logic is copied from #26240. Replace with once that PR is merged into master.
+type wrappedUpdatedObjectInfo struct {
+	objInfo rest.UpdatedObjectInfo
+
+	transformFunc rest.TransformFunc
+}
+
+func wrapUpdatedObjectInfo(objInfo rest.UpdatedObjectInfo, transformFunc rest.TransformFunc) rest.UpdatedObjectInfo {
+	return &wrappedUpdatedObjectInfo{objInfo, transformFunc}
+}
+
+func (i *wrappedUpdatedObjectInfo) Preconditions() *api.Preconditions {
+	return i.objInfo.Preconditions()
+}
+
+func (i *wrappedUpdatedObjectInfo) UpdatedObject(ctx api.Context, oldObj runtime.Object) (runtime.Object, error) {
+	obj, err := i.objInfo.UpdatedObject(ctx, oldObj)
+	if err != nil {
+		return obj, err
+	}
+	return i.transformFunc(ctx, obj, oldObj)
+}

pkg/registry/rolebinding/registry.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 rolebinding
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/rest"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/pkg/watch"
+)
+
+// Registry is an interface for things that know how to store RoleBindings.
+type Registry interface {
+	ListRoleBindings(ctx api.Context, options *api.ListOptions) (*rbac.RoleBindingList, error)
+	CreateRoleBinding(ctx api.Context, roleBinding *rbac.RoleBinding) error
+	UpdateRoleBinding(ctx api.Context, roleBinding *rbac.RoleBinding) error
+	GetRoleBinding(ctx api.Context, name string) (*rbac.RoleBinding, error)
+	DeleteRoleBinding(ctx api.Context, name string) error
+	WatchRoleBindings(ctx api.Context, options *api.ListOptions) (watch.Interface, error)
+}
+
+// storage puts strong typing around storage calls
+type storage struct {
+	rest.StandardStorage
+}
+
+// NewRegistry returns a new Registry interface for the given Storage. Any mismatched
+// types will panic.
+func NewRegistry(s rest.StandardStorage) Registry {
+	return &storage{s}
+}
+
+func (s *storage) ListRoleBindings(ctx api.Context, options *api.ListOptions) (*rbac.RoleBindingList, error) {
+	obj, err := s.List(ctx, options)
+	if err != nil {
+		return nil, err
+	}
+
+	return obj.(*rbac.RoleBindingList), nil
+}
+
+func (s *storage) CreateRoleBinding(ctx api.Context, roleBinding *rbac.RoleBinding) error {
+	// TODO(ericchiang): add additional validation
+	_, err := s.Create(ctx, roleBinding)
+	return err
+}
+
+func (s *storage) UpdateRoleBinding(ctx api.Context, roleBinding *rbac.RoleBinding) error {
+	_, _, err := s.Update(ctx, roleBinding.Name, rest.DefaultUpdatedObjectInfo(roleBinding, api.Scheme))
+	return err
+}
+
+func (s *storage) WatchRoleBindings(ctx api.Context, options *api.ListOptions) (watch.Interface, error) {
+	return s.Watch(ctx, options)
+}
+
+func (s *storage) GetRoleBinding(ctx api.Context, name string) (*rbac.RoleBinding, error) {
+	obj, err := s.Get(ctx, name)
+	if err != nil {
+		return nil, err
+	}
+	return obj.(*rbac.RoleBinding), nil
+}
+
+func (s *storage) DeleteRoleBinding(ctx api.Context, name string) error {
+	_, err := s.Delete(ctx, name, nil)
+	return err
+}

pkg/registry/rolebinding/strategy.go

+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 rolebinding
+
+import (
+	"fmt"
+
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/rest"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/pkg/apis/rbac/validation"
+	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/labels"
+	"k8s.io/kubernetes/pkg/registry/generic"
+	"k8s.io/kubernetes/pkg/runtime"
+	"k8s.io/kubernetes/pkg/util/validation/field"
+)
+
+// strategy implements behavior for RoleBindings
+type strategy struct {
+	runtime.ObjectTyper
+	api.NameGenerator
+}
+
+// strategy is the default logic that applies when creating and updating
+// RoleBinding objects.
+var Strategy = strategy{api.Scheme, api.SimpleNameGenerator}
+
+// Strategy should implement rest.RESTCreateStrategy
+var _ rest.RESTCreateStrategy = Strategy
+
+// Strategy should implement rest.RESTUpdateStrategy
+var _ rest.RESTUpdateStrategy = Strategy
+
+// NamespaceScoped is true for RoleBindings.
+func (strategy) NamespaceScoped() bool {
+	return true
+}
+
+// AllowCreateOnUpdate is true for RoleBindings.
+func (strategy) AllowCreateOnUpdate() bool {
+	return true
+}
+
+// PrepareForCreate clears fields that are not allowed to be set by end users
+// on creation.
+func (strategy) PrepareForCreate(obj runtime.Object) {
+	_ = obj.(*rbac.RoleBinding)
+}
+
+// PrepareForUpdate clears fields that are not allowed to be set by end users on update.
+func (strategy) PrepareForUpdate(obj, old runtime.Object) {
+	newRoleBinding := obj.(*rbac.RoleBinding)
+	oldRoleBinding := old.(*rbac.RoleBinding)
+
+	_, _ = newRoleBinding, oldRoleBinding
+}
+
+// Validate validates a new RoleBinding. Validation must check for a correct signature.
+func (strategy) Validate(ctx api.Context, obj runtime.Object) field.ErrorList {
+	roleBinding := obj.(*rbac.RoleBinding)
+	return validation.ValidateRoleBinding(roleBinding)
+}
+
+// Canonicalize normalizes the object after validation.
+func (strategy) Canonicalize(obj runtime.Object) {
+	_ = obj.(*rbac.RoleBinding)
+}
+
+// ValidateUpdate is the default update validation for an end user.
+func (strategy) ValidateUpdate(ctx api.Context, obj, old runtime.Object) field.ErrorList {
+	newObj := obj.(*rbac.RoleBinding)
+	errorList := validation.ValidateRoleBinding(newObj)
+	return append(errorList, validation.ValidateRoleBindingUpdate(newObj, old.(*rbac.RoleBinding))...)
+}
+
+// If AllowUnconditionalUpdate() is true and the object specified by
+// the user does not have a resource version, then generic Update()
+// populates it with the latest version. Else, it checks that the
+// version specified by the user matches the version of latest etcd
+// object.
+func (strategy) AllowUnconditionalUpdate() bool {
+	return true
+}
+
+func (s strategy) Export(obj runtime.Object, exact bool) error {
+	return nil
+}
+
+// Matcher returns a generic matcher for a given label and field selector.
+func Matcher(label labels.Selector, field fields.Selector) generic.Matcher {
+	return generic.MatcherFunc(func(obj runtime.Object) (bool, error) {
+		sa, ok := obj.(*rbac.RoleBinding)
+		if !ok {
+			return false, fmt.Errorf("not a RoleBinding")
+		}
+		fields := SelectableFields(sa)
+		return label.Matches(labels.Set(sa.Labels)) && field.Matches(fields), nil
+	})
+}
+
+// SelectableFields returns a label set that can be used for filter selection
+func SelectableFields(obj *rbac.RoleBinding) labels.Set {
+	return labels.Set{}
+}