mirror of https://github.com/k3s-io/k3s
101 lines
3.5 KiB
Go
101 lines
3.5 KiB
Go
/*
|
|
Copyright 2014 The Kubernetes Authors.
|
|
|
|
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 scdeny
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
|
|
apierrors "k8s.io/apimachinery/pkg/api/errors"
|
|
"k8s.io/apiserver/pkg/admission"
|
|
api "k8s.io/kubernetes/pkg/apis/core"
|
|
)
|
|
|
|
// PluginName indicates name of admission plugin.
|
|
const PluginName = "SecurityContextDeny"
|
|
|
|
// Register registers a plugin
|
|
func Register(plugins *admission.Plugins) {
|
|
plugins.Register(PluginName, func(config io.Reader) (admission.Interface, error) {
|
|
return NewSecurityContextDeny(), nil
|
|
})
|
|
}
|
|
|
|
// Plugin implements admission.Interface.
|
|
type Plugin struct {
|
|
*admission.Handler
|
|
}
|
|
|
|
var _ admission.ValidationInterface = &Plugin{}
|
|
|
|
// NewSecurityContextDeny creates a new instance of the SecurityContextDeny admission controller
|
|
func NewSecurityContextDeny() *Plugin {
|
|
return &Plugin{
|
|
Handler: admission.NewHandler(admission.Create, admission.Update),
|
|
}
|
|
}
|
|
|
|
// Validate will deny any pod that defines SupplementalGroups, SELinuxOptions, RunAsUser or FSGroup
|
|
func (p *Plugin) Validate(a admission.Attributes) (err error) {
|
|
if a.GetSubresource() != "" || a.GetResource().GroupResource() != api.Resource("pods") {
|
|
return nil
|
|
}
|
|
|
|
pod, ok := a.GetObject().(*api.Pod)
|
|
if !ok {
|
|
return apierrors.NewBadRequest("Resource was marked with kind Pod but was unable to be converted")
|
|
}
|
|
|
|
if pod.Spec.SecurityContext != nil {
|
|
if pod.Spec.SecurityContext.SupplementalGroups != nil {
|
|
return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("pod.Spec.SecurityContext.SupplementalGroups is forbidden"))
|
|
}
|
|
if pod.Spec.SecurityContext.SELinuxOptions != nil {
|
|
return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("pod.Spec.SecurityContext.SELinuxOptions is forbidden"))
|
|
}
|
|
if pod.Spec.SecurityContext.RunAsUser != nil {
|
|
return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("pod.Spec.SecurityContext.RunAsUser is forbidden"))
|
|
}
|
|
if pod.Spec.SecurityContext.FSGroup != nil {
|
|
return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("pod.Spec.SecurityContext.FSGroup is forbidden"))
|
|
}
|
|
}
|
|
|
|
for _, v := range pod.Spec.InitContainers {
|
|
if v.SecurityContext != nil {
|
|
if v.SecurityContext.SELinuxOptions != nil {
|
|
return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("SecurityContext.SELinuxOptions is forbidden"))
|
|
}
|
|
if v.SecurityContext.RunAsUser != nil {
|
|
return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("SecurityContext.RunAsUser is forbidden"))
|
|
}
|
|
}
|
|
}
|
|
|
|
for _, v := range pod.Spec.Containers {
|
|
if v.SecurityContext != nil {
|
|
if v.SecurityContext.SELinuxOptions != nil {
|
|
return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("SecurityContext.SELinuxOptions is forbidden"))
|
|
}
|
|
if v.SecurityContext.RunAsUser != nil {
|
|
return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("SecurityContext.RunAsUser is forbidden"))
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|