Golang Attributes.GetSubresource方法代碼示例

// Admit will deny any pod that defines AntiAffinity topology key other than metav1.LabelHostname i.e. "kubernetes.io/hostname"
// in  requiredDuringSchedulingRequiredDuringExecution and requiredDuringSchedulingIgnoredDuringExecution.
func (p *plugin) Admit(attributes admission.Attributes) (err error) {
	// Ignore all calls to subresources or resources other than pods.
	if len(attributes.GetSubresource()) != 0 || attributes.GetResource().GroupResource() != api.Resource("pods") {
		return nil
	}
	pod, ok := attributes.GetObject().(*api.Pod)
	if !ok {
		return apierrors.NewBadRequest("Resource was marked with kind Pod but was unable to be converted")
	}
	affinity := pod.Spec.Affinity
	if affinity != nil && affinity.PodAntiAffinity != nil {
		var podAntiAffinityTerms []api.PodAffinityTerm
		if len(affinity.PodAntiAffinity.RequiredDuringSchedulingIgnoredDuringExecution) != 0 {
			podAntiAffinityTerms = affinity.PodAntiAffinity.RequiredDuringSchedulingIgnoredDuringExecution
		}
		// TODO: Uncomment this block when implement RequiredDuringSchedulingRequiredDuringExecution.
		//if len(affinity.PodAntiAffinity.RequiredDuringSchedulingRequiredDuringExecution) != 0 {
		//        podAntiAffinityTerms = append(podAntiAffinityTerms, affinity.PodAntiAffinity.RequiredDuringSchedulingRequiredDuringExecution...)
		//}
		for _, v := range podAntiAffinityTerms {
			if v.TopologyKey != metav1.LabelHostname {
				return apierrors.NewForbidden(attributes.GetResource().GroupResource(), pod.Name, fmt.Errorf("affinity.PodAntiAffinity.RequiredDuringScheduling has TopologyKey %v but only key %v is allowed", v.TopologyKey, metav1.LabelHostname))
			}
		}
	}
	return nil
}

// SupportsAttributes ignores all calls that do not deal with pod resources or storage requests (PVCs).
// Also ignores any call that has a subresource defined.
func (d *DefaultLimitRangerActions) SupportsAttributes(a admission.Attributes) bool {
	if a.GetSubresource() != "" {
		return false
	}

	return a.GetKind().GroupKind() == api.Kind("Pod") || a.GetKind().GroupKind() == api.Kind("PersistentVolumeClaim")
}

func (a *gcPermissionsEnforcement) Admit(attributes admission.Attributes) (err error) {
	// if we aren't changing owner references, then the edit is always allowed
	if !isChangingOwnerReference(attributes.GetObject(), attributes.GetOldObject()) {
		return nil
	}

	deleteAttributes := authorizer.AttributesRecord{
		User:            attributes.GetUserInfo(),
		Verb:            "delete",
		Namespace:       attributes.GetNamespace(),
		APIGroup:        attributes.GetResource().Group,
		APIVersion:      attributes.GetResource().Version,
		Resource:        attributes.GetResource().Resource,
		Subresource:     attributes.GetSubresource(),
		Name:            attributes.GetName(),
		ResourceRequest: true,
		Path:            "",
	}
	allowed, reason, err := a.authorizer.Authorize(deleteAttributes)
	if allowed {
		return nil
	}

	return admission.NewForbidden(attributes, fmt.Errorf("cannot set an ownerRef on a resource you can't delete: %v, %v", reason, err))
}

// Admit will deny any pod that defines SELinuxOptions or RunAsUser.
func (p *plugin) Admit(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 && pod.Spec.SecurityContext.SupplementalGroups != nil {
		return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("SecurityContext.SupplementalGroups is forbidden"))
	}
	if pod.Spec.SecurityContext != nil {
		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 != nil && pod.Spec.SecurityContext.FSGroup != nil {
		return apierrors.NewForbidden(a.GetResource().GroupResource(), pod.Name, fmt.Errorf("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
}

// Admit sets the default value of a PersistentVolumeClaim's storage class, in case the user did
// not provide a value.
//
// 1.  Find available StorageClasses.
// 2.  Figure which is the default
// 3.  Write to the PVClaim
func (c *claimDefaulterPlugin) Admit(a admission.Attributes) error {
	if a.GetResource().GroupResource() != api.Resource("persistentvolumeclaims") {
		return nil
	}

	if len(a.GetSubresource()) != 0 {
		return nil
	}

	pvc, ok := a.GetObject().(*api.PersistentVolumeClaim)
	// if we can't convert then we don't handle this object so just return
	if !ok {
		return nil
	}

	if storageutil.HasStorageClassAnnotation(pvc.ObjectMeta) {
		// The user asked for a class.
		return nil
	}

	glog.V(4).Infof("no storage class for claim %s (generate: %s)", pvc.Name, pvc.GenerateName)

	def, err := getDefaultClass(c.store)
	if err != nil {
		return admission.NewForbidden(a, err)
	}
	if def == nil {
		// No default class selected, do nothing about the PVC.
		return nil
	}

	glog.V(4).Infof("defaulting storage class for claim %s (generate: %s) to %s", pvc.Name, pvc.GenerateName, def.Name)
	if pvc.ObjectMeta.Annotations == nil {
		pvc.ObjectMeta.Annotations = map[string]string{}
	}
	pvc.Annotations[storageutil.StorageClassAnnotation] = def.Name
	return nil
}

// Admit determines if the pod should be admitted based on the requested security context
// and the available PSPs.
//
// 1.  Find available PSPs.
// 2.  Create the providers, includes setting pre-allocated values if necessary.
// 3.  Try to generate and validate a PSP with providers.  If we find one then admit the pod
//     with the validated PSP.  If we don't find any reject the pod and give all errors from the
//     failed attempts.
func (c *podSecurityPolicyPlugin) Admit(a admission.Attributes) error {
	if a.GetResource().GroupResource() != api.Resource("pods") {
		return nil
	}

	if len(a.GetSubresource()) != 0 {
		return nil
	}

	pod, ok := a.GetObject().(*api.Pod)
	// if we can't convert then we don't handle this object so just return
	if !ok {
		return nil
	}

	// get all constraints that are usable by the user
	glog.V(4).Infof("getting pod security policies for pod %s (generate: %s)", pod.Name, pod.GenerateName)
	var saInfo user.Info
	if len(pod.Spec.ServiceAccountName) > 0 {
		saInfo = serviceaccount.UserInfo(a.GetNamespace(), pod.Spec.ServiceAccountName, "")
	}

	matchedPolicies, err := c.pspMatcher(c.store, a.GetUserInfo(), saInfo, c.authz)
	if err != nil {
		return admission.NewForbidden(a, err)
	}

	// if we have no policies and want to succeed then return.  Otherwise we'll end up with no
	// providers and fail with "unable to validate against any pod security policy" below.
	if len(matchedPolicies) == 0 && !c.failOnNoPolicies {
		return nil
	}

	providers, errs := c.createProvidersFromPolicies(matchedPolicies, pod.Namespace)
	logProviders(pod, providers, errs)

	if len(providers) == 0 {
		return admission.NewForbidden(a, fmt.Errorf("no providers available to validate pod request"))
	}

	// all containers in a single pod must validate under a single provider or we will reject the request
	validationErrs := field.ErrorList{}
	for _, provider := range providers {
		if errs := assignSecurityContext(provider, pod, field.NewPath(fmt.Sprintf("provider %s: ", provider.GetPSPName()))); len(errs) > 0 {
			validationErrs = append(validationErrs, errs...)
			continue
		}

		// the entire pod validated, annotate and accept the pod
		glog.V(4).Infof("pod %s (generate: %s) validated against provider %s", pod.Name, pod.GenerateName, provider.GetPSPName())
		if pod.ObjectMeta.Annotations == nil {
			pod.ObjectMeta.Annotations = map[string]string{}
		}
		pod.ObjectMeta.Annotations[psputil.ValidatedPSPAnnotation] = provider.GetPSPName()
		return nil
	}

	// we didn't validate against any provider, reject the pod and give the errors for each attempt
	glog.V(4).Infof("unable to validate pod %s (generate: %s) against any pod security policy: %v", pod.Name, pod.GenerateName, validationErrs)
	return admission.NewForbidden(a, fmt.Errorf("unable to validate against any pod security policy: %v", validationErrs))
}