// Admit will deny any SecurityContext that defines options that were not previously available in the api.Container
// struct (Capabilities and Privileged)
func (p *plugin) Admit(a admission.Attributes) (err error) {
if a.GetResource() != string(api.ResourcePods) {
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")
}
for _, v := range pod.Spec.Containers {
if v.SecurityContext != nil {
if v.SecurityContext.SELinuxOptions != nil {
return apierrors.NewForbidden(a.GetResource(), pod.Name, fmt.Errorf("SecurityContext.SELinuxOptions is forbidden"))
}
if v.SecurityContext.RunAsUser != nil {
return apierrors.NewForbidden(a.GetResource(), pod.Name, fmt.Errorf("SecurityContext.RunAsUser is forbidden"))
}
}
}
return nil
}
// NewForbidden is a utility function to return a well-formatted admission control error response
func NewForbidden(a Attributes, internalError error) error {
// do not double wrap an error of same type
if apierrors.IsForbidden(internalError) {
return internalError
}
name := "Unknown"
kind := a.GetKind()
obj := a.GetObject()
if obj != nil {
objectMeta, err := api.ObjectMetaFor(obj)
if err != nil {
return apierrors.NewForbidden(kind, name, internalError)
}
// this is necessary because name object name generation has not occurred yet
if len(objectMeta.Name) > 0 {
name = objectMeta.Name
} else if len(objectMeta.GenerateName) > 0 {
name = objectMeta.GenerateName
}
}
return apierrors.NewForbidden(kind, name, internalError)
}
func TestErrors(t *testing.T) {
o := NewObjects(api.Scheme, api.Scheme)
o.Add(&api.List{
Items: []runtime.Object{
// This first call to List will return this error
&(errors.NewNotFound("ServiceList", "").(*errors.StatusError).ErrStatus),
// The second call to List will return this error
&(errors.NewForbidden("ServiceList", "", nil).(*errors.StatusError).ErrStatus),
},
})
client := &Fake{ReactFn: ObjectReaction(o, latest.RESTMapper)}
_, err := client.Services("test").List(labels.Everything())
if !errors.IsNotFound(err) {
t.Fatalf("unexpected error: %v", err)
}
t.Logf("error: %#v", err.(*errors.StatusError).Status())
_, err = client.Services("test").List(labels.Everything())
if !errors.IsForbidden(err) {
t.Fatalf("unexpected error: %v", err)
}
}
func (l *lifecycle) Admit(a admission.Attributes) (err error) {
// prevent deletion of immortal namespaces
if a.GetOperation() == admission.Delete {
if a.GetKind() == "Namespace" && l.immortalNamespaces.Has(a.GetName()) {
return errors.NewForbidden(a.GetKind(), a.GetName(), fmt.Errorf("namespace can never be deleted"))
}
return nil
}
defaultVersion, kind, err := latest.RESTMapper.VersionAndKindForResource(a.GetResource())
if err != nil {
return admission.NewForbidden(a, err)
}
mapping, err := latest.RESTMapper.RESTMapping(kind, defaultVersion)
if err != nil {
return admission.NewForbidden(a, err)
}
if mapping.Scope.Name() != meta.RESTScopeNameNamespace {
return nil
}
namespaceObj, exists, err := l.store.Get(&api.Namespace{
ObjectMeta: api.ObjectMeta{
Name: a.GetNamespace(),
Namespace: "",
},
})
if err != nil {
return admission.NewForbidden(a, err)
}
if !exists {
return nil
}
namespace := namespaceObj.(*api.Namespace)
if namespace.Status.Phase != api.NamespaceTerminating {
return nil
}
return admission.NewForbidden(a, fmt.Errorf("Unable to create new content in namespace %s because it is being terminated.", a.GetNamespace()))
}