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102 lines
3.5 KiB
Go
102 lines
3.5 KiB
Go
/*
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Copyright 2014 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 scdeny
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import (
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"context"
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"fmt"
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"io"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apiserver/pkg/admission"
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api "k8s.io/kubernetes/pkg/apis/core"
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)
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// PluginName indicates name of admission plugin.
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const PluginName = "SecurityContextDeny"
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// Register registers a plugin
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func Register(plugins *admission.Plugins) {
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plugins.Register(PluginName, func(config io.Reader) (admission.Interface, error) {
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return NewSecurityContextDeny(), nil
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})
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}
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// Plugin implements admission.Interface.
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type Plugin struct {
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*admission.Handler
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}
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var _ admission.ValidationInterface = &Plugin{}
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// NewSecurityContextDeny creates a new instance of the SecurityContextDeny admission controller
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func NewSecurityContextDeny() *Plugin {
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return &Plugin{
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Handler: admission.NewHandler(admission.Create, admission.Update),
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}
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}
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// Validate will deny any pod that defines SupplementalGroups, SELinuxOptions, RunAsUser or FSGroup
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func (p *Plugin) Validate(ctx context.Context, a admission.Attributes, o admission.ObjectInterfaces) (err error) {
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if a.GetSubresource() != "" || a.GetResource().GroupResource() != api.Resource("pods") {
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return nil
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}
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pod, ok := a.GetObject().(*api.Pod)
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if !ok {
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return apierrors.NewBadRequest("Resource was marked with kind Pod but was unable to be converted")
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}
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if pod.Spec.SecurityContext != nil {
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if pod.Spec.SecurityContext.SupplementalGroups != nil {
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return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("pod.Spec.SecurityContext.SupplementalGroups is forbidden"))
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}
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if pod.Spec.SecurityContext.SELinuxOptions != nil {
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return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("pod.Spec.SecurityContext.SELinuxOptions is forbidden"))
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}
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if pod.Spec.SecurityContext.RunAsUser != nil {
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return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("pod.Spec.SecurityContext.RunAsUser is forbidden"))
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}
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if pod.Spec.SecurityContext.FSGroup != nil {
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return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("pod.Spec.SecurityContext.FSGroup is forbidden"))
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}
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}
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for _, v := range pod.Spec.InitContainers {
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if v.SecurityContext != nil {
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if v.SecurityContext.SELinuxOptions != nil {
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return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("SecurityContext.SELinuxOptions is forbidden"))
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}
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if v.SecurityContext.RunAsUser != nil {
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return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("SecurityContext.RunAsUser is forbidden"))
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}
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}
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}
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for _, v := range pod.Spec.Containers {
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if v.SecurityContext != nil {
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if v.SecurityContext.SELinuxOptions != nil {
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return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("SecurityContext.SELinuxOptions is forbidden"))
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}
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if v.SecurityContext.RunAsUser != nil {
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return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("SecurityContext.RunAsUser is forbidden"))
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}
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}
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}
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return nil
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}
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