mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
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112 lines
3.1 KiB
Go
112 lines
3.1 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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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 gc
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import (
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"fmt"
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"io"
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"k8s.io/apiserver/pkg/authorization/authorizer"
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"k8s.io/kubernetes/pkg/admission"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/api/meta"
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"k8s.io/kubernetes/pkg/runtime"
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)
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func init() {
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admission.RegisterPlugin("OwnerReferencesPermissionEnforcement", func(config io.Reader) (admission.Interface, error) {
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return &gcPermissionsEnforcement{
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Handler: admission.NewHandler(admission.Create, admission.Update),
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}, nil
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})
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}
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// gcPermissionsEnforcement is an implementation of admission.Interface.
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type gcPermissionsEnforcement struct {
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*admission.Handler
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authorizer authorizer.Authorizer
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}
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func (a *gcPermissionsEnforcement) Admit(attributes admission.Attributes) (err error) {
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// if we aren't changing owner references, then the edit is always allowed
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if !isChangingOwnerReference(attributes.GetObject(), attributes.GetOldObject()) {
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return nil
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}
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deleteAttributes := authorizer.AttributesRecord{
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User: attributes.GetUserInfo(),
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Verb: "delete",
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Namespace: attributes.GetNamespace(),
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APIGroup: attributes.GetResource().Group,
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APIVersion: attributes.GetResource().Version,
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Resource: attributes.GetResource().Resource,
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Subresource: attributes.GetSubresource(),
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Name: attributes.GetName(),
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ResourceRequest: true,
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Path: "",
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}
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allowed, reason, err := a.authorizer.Authorize(deleteAttributes)
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if allowed {
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return nil
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}
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return admission.NewForbidden(attributes, fmt.Errorf("cannot set an ownerRef on a resource you can't delete: %v, %v", reason, err))
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}
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func isChangingOwnerReference(newObj, oldObj runtime.Object) bool {
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newMeta, err := meta.Accessor(newObj)
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if err != nil {
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// if we don't have objectmeta, we don't have the object reference
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return false
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}
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if oldObj == nil {
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return len(newMeta.GetOwnerReferences()) > 0
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}
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oldMeta, err := meta.Accessor(oldObj)
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if err != nil {
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// if we don't have objectmeta, we don't have the object reference
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return false
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}
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// compare the old and new. If they aren't the same, then we're trying to change an ownerRef
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oldOwners := oldMeta.GetOwnerReferences()
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newOwners := newMeta.GetOwnerReferences()
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if len(oldOwners) != len(newOwners) {
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return true
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}
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for i := range oldOwners {
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if !api.Semantic.DeepEqual(oldOwners[i], newOwners[i]) {
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return true
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}
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}
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return false
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}
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func (a *gcPermissionsEnforcement) SetAuthorizer(authorizer authorizer.Authorizer) {
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a.authorizer = authorizer
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}
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func (a *gcPermissionsEnforcement) Validate() error {
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if a.authorizer == nil {
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return fmt.Errorf("missing authorizer")
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}
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return nil
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}
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