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projectrbac.go
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projectrbac.go
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// Copyright (c) 2021 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 projectrbac
import (
"context"
"fmt"
"strings"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/operation/botanist/component"
"github.com/gardener/gardener/pkg/utils/flow"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
rbacv1 "k8s.io/api/rbac/v1"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/utils/pointer"
"sigs.k8s.io/controller-runtime/pkg/client"
)
const (
namePrefixSpecificProjectAdmin = "gardener.cloud:system:project:"
namePrefixSpecificProjectMember = "gardener.cloud:system:project-member:"
namePrefixSpecificProjectUAM = "gardener.cloud:system:project-uam:"
namePrefixSpecificProjectViewer = "gardener.cloud:system:project-viewer:"
namePrefixSpecificProjectExtensions = "gardener.cloud:extension:project:"
nameProjectMember = "gardener.cloud:system:project-member"
nameProjectViewer = "gardener.cloud:system:project-viewer"
nameProjectServiceAccountManager = "gardener.cloud:system:project-serviceaccountmanager"
)
// Interface extends component.Deployer with a function to delete stale extension roles resources.
type Interface interface {
component.Deployer
DeleteStaleExtensionRolesResources(context.Context) error
}
// New creates a new instance of Interface for the RBAC resources required to interact with Projects.
func New(client client.Client, project *gardencorev1beta1.Project) (Interface, error) {
if project.Spec.Namespace == nil {
return nil, fmt.Errorf("cannot create Interface for a project with `.spec.namespace=nil`")
}
return &projectRBAC{
client: client,
project: project,
}, nil
}
type projectRBAC struct {
client client.Client
project *gardencorev1beta1.Project
}
func (p *projectRBAC) Deploy(ctx context.Context) error {
var (
admins []rbacv1.Subject
members []rbacv1.Subject
uams []rbacv1.Subject
viewers []rbacv1.Subject
serviceAccountManagers []rbacv1.Subject
extensionRolesNameToSubjects = map[string][]rbacv1.Subject{}
extensionRolesNames = sets.NewString()
)
if p.project.Spec.Owner != nil {
admins = []rbacv1.Subject{*p.project.Spec.Owner}
serviceAccountManagers = []rbacv1.Subject{*p.project.Spec.Owner}
}
for _, member := range p.project.Spec.Members {
for _, role := range append([]string{member.Role}, member.Roles...) {
if role == gardencorev1beta1.ProjectMemberAdmin || role == gardencorev1beta1.ProjectMemberOwner {
members = append(members, member.Subject)
}
if role == gardencorev1beta1.ProjectMemberUserAccessManager {
uams = append(uams, member.Subject)
}
if role == gardencorev1beta1.ProjectMemberServiceAccountManager || role == gardencorev1beta1.ProjectMemberOwner {
serviceAccountManagers = append(serviceAccountManagers, member.Subject)
}
if role == gardencorev1beta1.ProjectMemberViewer {
viewers = append(viewers, member.Subject)
}
if strings.HasPrefix(role, gardencorev1beta1.ProjectMemberExtensionPrefix) {
extensionRoleName := getExtensionRoleNameFromRole(role)
extensionRolesNameToSubjects[extensionRoleName] = append(extensionRolesNameToSubjects[extensionRoleName], member.Subject)
extensionRolesNames.Insert(extensionRoleName)
}
}
}
fns := []flow.TaskFn{
// project admin resources
func(ctx context.Context) error {
return p.reconcileResources(
ctx,
namePrefixSpecificProjectAdmin+p.project.Name,
true,
nil,
nil,
admins,
nil,
[]rbacv1.PolicyRule{
{
APIGroups: []string{""},
Resources: []string{"namespaces"},
ResourceNames: []string{*p.project.Spec.Namespace},
Verbs: []string{"get"},
},
{
APIGroups: []string{gardencorev1beta1.SchemeGroupVersion.Group},
Resources: []string{"projects"},
ResourceNames: []string{p.project.Name},
Verbs: []string{"get", "patch", "manage-members", "update", "delete"},
},
},
)
},
// project uam resources
func(ctx context.Context) error {
return p.reconcileResources(
ctx,
namePrefixSpecificProjectUAM+p.project.Name,
true,
nil,
nil,
uams,
nil,
[]rbacv1.PolicyRule{
{
APIGroups: []string{gardencorev1beta1.SchemeGroupVersion.Group},
Resources: []string{"projects"},
ResourceNames: []string{p.project.Name},
Verbs: []string{"get", "manage-members", "patch", "update"},
},
},
)
},
// service account manager resources
func(ctx context.Context) error {
return p.reconcileServiceAccountManagerRoleBinding(ctx, serviceAccountManagers)
},
// project members resources
func(ctx context.Context) error {
return p.reconcileResources(
ctx,
namePrefixSpecificProjectMember+p.project.Name,
true,
pointer.String(nameProjectMember),
nil,
members,
nil,
[]rbacv1.PolicyRule{
{
APIGroups: []string{""},
Resources: []string{"namespaces"},
ResourceNames: []string{*p.project.Spec.Namespace},
Verbs: []string{"get"},
},
{
APIGroups: []string{gardencorev1beta1.SchemeGroupVersion.Group},
Resources: []string{"projects"},
ResourceNames: []string{p.project.Name},
Verbs: []string{"get", "patch", "update", "delete"},
},
},
)
},
// project viewer resources
func(ctx context.Context) error {
return p.reconcileResources(
ctx,
namePrefixSpecificProjectViewer+p.project.Name,
true,
pointer.String(nameProjectViewer),
nil,
viewers,
nil,
[]rbacv1.PolicyRule{
{
APIGroups: []string{""},
Resources: []string{"namespaces"},
ResourceNames: []string{*p.project.Spec.Namespace},
Verbs: []string{"get"},
},
{
APIGroups: []string{gardencorev1beta1.SchemeGroupVersion.Group},
Resources: []string{"projects"},
ResourceNames: []string{p.project.Name},
Verbs: []string{"get"},
},
},
)
},
}
// project extension roles resources
for _, roleName := range extensionRolesNames.List() {
var (
name = fmt.Sprintf("%s%s:%s", namePrefixSpecificProjectExtensions, p.project.Name, roleName)
subjects = extensionRolesNameToSubjects[roleName]
aggregationRule = &rbacv1.AggregationRule{
ClusterRoleSelectors: []metav1.LabelSelector{
{MatchLabels: map[string]string{"rbac.gardener.cloud/aggregate-to-extension-role": roleName}},
},
}
)
fns = append(fns, func(ctx context.Context) error {
return p.reconcileResources(
ctx,
name,
false,
&name,
p.getExtensionRolesResourceLabels(),
subjects,
aggregationRule,
nil,
)
})
}
return flow.Parallel(fns...)(ctx)
}
func (p *projectRBAC) reconcileResources(
ctx context.Context,
clusterRoleName string,
withClusterRoleBinding bool,
roleBindingName *string,
labels map[string]string,
subjects []rbacv1.Subject,
aggregationRule *rbacv1.AggregationRule,
rules []rbacv1.PolicyRule,
) error {
subjectsUnique := removeDuplicateSubjects(subjects)
ownerRef := metav1.NewControllerRef(&p.project.ObjectMeta, gardencorev1beta1.SchemeGroupVersion.WithKind("Project"))
ownerRef.BlockOwnerDeletion = pointer.Bool(false)
clusterRole := emptyClusterRole(clusterRoleName)
if _, err := controllerutils.GetAndCreateOrStrategicMergePatch(ctx, p.client, clusterRole, func() error {
clusterRole.OwnerReferences = []metav1.OwnerReference{*ownerRef}
clusterRole.Labels = labels
clusterRole.AggregationRule = aggregationRule
clusterRole.Rules = rules
return nil
}); err != nil {
return err
}
if withClusterRoleBinding {
clusterRoleBinding := emptyClusterRoleBinding(clusterRoleName)
if _, err := controllerutils.GetAndCreateOrStrategicMergePatch(ctx, p.client, clusterRoleBinding, func() error {
clusterRoleBinding.OwnerReferences = []metav1.OwnerReference{*ownerRef}
clusterRoleBinding.Labels = labels
clusterRoleBinding.RoleRef = rbacv1.RoleRef{
APIGroup: rbacv1.SchemeGroupVersion.Group,
Kind: "ClusterRole",
Name: clusterRoleBinding.Name,
}
clusterRoleBinding.Subjects = subjectsUnique
return nil
}); err != nil {
return err
}
}
if roleBindingName != nil {
roleBinding := emptyRoleBinding(*roleBindingName, *p.project.Spec.Namespace)
if _, err := controllerutils.GetAndCreateOrStrategicMergePatch(ctx, p.client, roleBinding, func() error {
roleBinding.OwnerReferences = []metav1.OwnerReference{*ownerRef}
roleBinding.Labels = labels
roleBinding.RoleRef = rbacv1.RoleRef{
APIGroup: rbacv1.SchemeGroupVersion.Group,
Kind: "ClusterRole",
Name: roleBinding.Name,
}
roleBinding.Subjects = subjectsUnique
return nil
}); err != nil {
return err
}
}
return nil
}
func (p *projectRBAC) reconcileServiceAccountManagerRoleBinding(ctx context.Context, subjects []rbacv1.Subject) error {
subjectsUnique := removeDuplicateSubjects(subjects)
ownerRef := metav1.NewControllerRef(&p.project.ObjectMeta, gardencorev1beta1.SchemeGroupVersion.WithKind("Project"))
ownerRef.BlockOwnerDeletion = pointer.Bool(false)
roleBinding := emptyRoleBinding(nameProjectServiceAccountManager, *p.project.Spec.Namespace)
_, err := controllerutils.GetAndCreateOrStrategicMergePatch(ctx, p.client, roleBinding, func() error {
roleBinding.OwnerReferences = []metav1.OwnerReference{*ownerRef}
roleBinding.Labels = nil
roleBinding.RoleRef = rbacv1.RoleRef{
APIGroup: rbacv1.SchemeGroupVersion.Group,
Kind: "ClusterRole",
Name: roleBinding.Name,
}
roleBinding.Subjects = subjectsUnique
return nil
})
return err
}
func (p *projectRBAC) Destroy(ctx context.Context) error {
if err := p.deleteExtensionRolesResources(ctx, sets.NewString()); err != nil {
return err
}
return kutil.DeleteObjects(ctx, p.client,
emptyClusterRole(namePrefixSpecificProjectAdmin+p.project.Name),
emptyClusterRoleBinding(namePrefixSpecificProjectAdmin+p.project.Name),
emptyClusterRole(namePrefixSpecificProjectUAM+p.project.Name),
emptyClusterRoleBinding(namePrefixSpecificProjectUAM+p.project.Name),
emptyRoleBinding(nameProjectServiceAccountManager, *p.project.Spec.Namespace),
emptyClusterRole(namePrefixSpecificProjectMember+p.project.Name),
emptyClusterRoleBinding(namePrefixSpecificProjectMember+p.project.Name),
emptyRoleBinding(nameProjectMember, *p.project.Spec.Namespace),
emptyClusterRole(namePrefixSpecificProjectViewer+p.project.Name),
emptyClusterRoleBinding(namePrefixSpecificProjectViewer+p.project.Name),
emptyRoleBinding(nameProjectViewer, *p.project.Spec.Namespace),
)
}
func (p *projectRBAC) DeleteStaleExtensionRolesResources(ctx context.Context) error {
wantedExtensionRolesNames := sets.NewString()
for _, member := range p.project.Spec.Members {
for _, role := range append([]string{member.Role}, member.Roles...) {
if strings.HasPrefix(role, gardencorev1beta1.ProjectMemberExtensionPrefix) {
extensionRoleName := getExtensionRoleNameFromRole(role)
wantedExtensionRolesNames.Insert(extensionRoleName)
}
}
}
return p.deleteExtensionRolesResources(ctx, wantedExtensionRolesNames)
}
func (p *projectRBAC) deleteExtensionRolesResources(ctx context.Context, wantedExtensionRolesNames sets.String) error {
for _, list := range []client.ObjectList{
&rbacv1.RoleBindingList{},
&rbacv1.ClusterRoleList{},
} {
if err := p.client.List(ctx, list, client.InNamespace(*p.project.Spec.Namespace), client.MatchingLabels(p.getExtensionRolesResourceLabels())); err != nil {
return err
}
if err := meta.EachListItem(list, func(obj runtime.Object) error {
o := obj.(client.Object)
if wantedExtensionRolesNames.Has(getExtensionRoleNameFromRBAC(o.GetName(), p.project.Name)) {
return nil
}
return client.IgnoreNotFound(p.client.Delete(ctx, o))
}); err != nil {
return err
}
}
return nil
}
func (p *projectRBAC) getExtensionRolesResourceLabels() map[string]string {
return map[string]string{
v1beta1constants.GardenRole: v1beta1constants.LabelExtensionProjectRole,
v1beta1constants.ProjectName: p.project.Name,
}
}
func getExtensionRoleNameFromRBAC(resourceName, projectName string) string {
return strings.TrimPrefix(resourceName, namePrefixSpecificProjectExtensions+projectName+":")
}
func getExtensionRoleNameFromRole(role string) string {
return strings.TrimPrefix(role, gardencorev1beta1.ProjectMemberExtensionPrefix)
}
func emptyClusterRole(name string) *rbacv1.ClusterRole {
return &rbacv1.ClusterRole{ObjectMeta: metav1.ObjectMeta{Name: name}}
}
func emptyClusterRoleBinding(name string) *rbacv1.ClusterRoleBinding {
return &rbacv1.ClusterRoleBinding{ObjectMeta: metav1.ObjectMeta{Name: name}}
}
func emptyRoleBinding(name, namespace string) *rbacv1.RoleBinding {
return &rbacv1.RoleBinding{
ObjectMeta: metav1.ObjectMeta{Name: name, Namespace: namespace}}
}
func removeDuplicateSubjects(subjects []rbacv1.Subject) []rbacv1.Subject {
var (
key = func(subject rbacv1.Subject) string {
return fmt.Sprintf("%s_%s_%s_%s", subject.APIGroup, subject.Kind, subject.Namespace, subject.Name)
}
processed = sets.NewString()
out []rbacv1.Subject
)
for _, subject := range subjects {
if k := key(subject); !processed.Has(k) {
out = append(out, subject)
processed.Insert(k)
}
}
return out
}