mirror of https://github.com/k3s-io/k3s
101 lines
3.2 KiB
Go
101 lines
3.2 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package policybased implements a standard storage for ClusterRole that prevents privilege escalation.
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package policybased
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import (
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/api/errors"
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"k8s.io/kubernetes/pkg/api/rest"
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"k8s.io/kubernetes/pkg/apis/rbac"
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"k8s.io/kubernetes/pkg/apis/rbac/validation"
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"k8s.io/kubernetes/pkg/runtime"
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)
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var groupResource = rbac.Resource("clusterroles")
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type Storage struct {
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rest.StandardStorage
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ruleResolver validation.AuthorizationRuleResolver
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// user which skips privilege escalation checks
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superUser string
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}
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func NewStorage(s rest.StandardStorage, ruleResolver validation.AuthorizationRuleResolver, superUser string) *Storage {
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return &Storage{s, ruleResolver, superUser}
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}
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func (s *Storage) Create(ctx api.Context, obj runtime.Object) (runtime.Object, error) {
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if user, ok := api.UserFrom(ctx); ok {
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if s.superUser != "" && user.GetName() == s.superUser {
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return s.StandardStorage.Create(ctx, obj)
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}
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}
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clusterRole := obj.(*rbac.ClusterRole)
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rules := clusterRole.Rules
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if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
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return nil, errors.NewForbidden(groupResource, clusterRole.Name, err)
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}
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return s.StandardStorage.Create(ctx, obj)
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}
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func (s *Storage) Update(ctx api.Context, name string, obj rest.UpdatedObjectInfo) (runtime.Object, bool, error) {
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if user, ok := api.UserFrom(ctx); ok {
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if s.superUser != "" && user.GetName() == s.superUser {
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return s.StandardStorage.Update(ctx, name, obj)
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}
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}
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nonEscalatingInfo := wrapUpdatedObjectInfo(obj, func(ctx api.Context, obj runtime.Object, oldObj runtime.Object) (runtime.Object, error) {
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clusterRole := obj.(*rbac.ClusterRole)
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rules := clusterRole.Rules
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if err := validation.ConfirmNoEscalation(ctx, s.ruleResolver, rules); err != nil {
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return nil, errors.NewForbidden(groupResource, clusterRole.Name, err)
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}
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return obj, nil
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})
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return s.StandardStorage.Update(ctx, name, nonEscalatingInfo)
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}
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// TODO(ericchiang): This logic is copied from #26240. Replace with once that PR is merged into master.
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type wrappedUpdatedObjectInfo struct {
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objInfo rest.UpdatedObjectInfo
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transformFunc rest.TransformFunc
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}
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func wrapUpdatedObjectInfo(objInfo rest.UpdatedObjectInfo, transformFunc rest.TransformFunc) rest.UpdatedObjectInfo {
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return &wrappedUpdatedObjectInfo{objInfo, transformFunc}
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}
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func (i *wrappedUpdatedObjectInfo) Preconditions() *api.Preconditions {
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return i.objInfo.Preconditions()
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}
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func (i *wrappedUpdatedObjectInfo) UpdatedObject(ctx api.Context, oldObj runtime.Object) (runtime.Object, error) {
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obj, err := i.objInfo.UpdatedObject(ctx, oldObj)
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if err != nil {
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return obj, err
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}
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return i.transformFunc(ctx, obj, oldObj)
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}
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