示例#1
0
func (d *denyExec) Admit(a admission.Attributes) (err error) {
	connectRequest, ok := a.GetObject().(*rest.ConnectRequest)
	if !ok {
		return errors.NewBadRequest("a connect request was received, but could not convert the request object.")
	}
	// Only handle exec or attach requests on pods
	if connectRequest.ResourcePath != "pods/exec" && connectRequest.ResourcePath != "pods/attach" {
		return nil
	}
	pod, err := d.client.Pods(a.GetNamespace()).Get(connectRequest.Name)
	if err != nil {
		return admission.NewForbidden(a, err)
	}

	if d.hostPID && pod.Spec.HostPID {
		return admission.NewForbidden(a, fmt.Errorf("Cannot exec into or attach to a container using host pid"))
	}

	if d.hostIPC && pod.Spec.HostIPC {
		return admission.NewForbidden(a, fmt.Errorf("Cannot exec into or attach to a container using host ipc"))
	}

	if d.privileged && isPrivileged(pod) {
		return admission.NewForbidden(a, fmt.Errorf("Cannot exec into or attach to a privileged container"))
	}

	return nil
}
示例#2
0
func (ir initialResources) Admit(a admission.Attributes) (err error) {
	// Ignore all calls to subresources or resources other than pods.
	if a.GetSubresource() != "" || 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")
	}

	ir.estimateAndFillResourcesIfNotSet(pod)
	return nil
}
示例#3
0
// Admit admits resources into cluster that do not violate any defined LimitRange in the namespace
func (l *limitRanger) Admit(a admission.Attributes) (err error) {

	// Ignore all calls to subresources
	if a.GetSubresource() != "" {
		return nil
	}

	obj := a.GetObject()
	resource := a.GetResource()
	name := "Unknown"
	if obj != nil {
		name, _ = meta.NewAccessor().Name(obj)
		if len(name) == 0 {
			name, _ = meta.NewAccessor().GenerateName(obj)
		}
	}

	key := &api.LimitRange{
		ObjectMeta: api.ObjectMeta{
			Namespace: a.GetNamespace(),
			Name:      "",
		},
	}
	items, err := l.indexer.Index("namespace", key)
	if err != nil {
		return admission.NewForbidden(a, fmt.Errorf("Unable to %s %s at this time because there was an error enforcing limit ranges", a.GetOperation(), resource))
	}
	if len(items) == 0 {
		return nil
	}

	// ensure it meets each prescribed min/max
	for i := range items {
		limitRange := items[i].(*api.LimitRange)
		err = l.limitFunc(limitRange, a.GetResource(), a.GetObject())
		if err != nil {
			return admission.NewForbidden(a, err)
		}
	}
	return nil
}
示例#4
0
// 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
}
示例#5
0
// IncrementUsage updates the supplied ResourceQuotaStatus object based on the incoming operation
// Return true if the usage must be recorded prior to admitting the new resource
// Return an error if the operation should not pass admission control
func IncrementUsage(a admission.Attributes, status *api.ResourceQuotaStatus, client client.Interface) (bool, error) {
	var errs []error
	dirty := true
	set := map[api.ResourceName]bool{}
	for k := range status.Hard {
		set[k] = true
	}
	obj := a.GetObject()
	// handle max counts for each kind of resource (pods, services, replicationControllers, etc.)
	if a.GetOperation() == admission.Create {
		resourceName := resourceToResourceName[a.GetResource()]
		hard, hardFound := status.Hard[resourceName]
		if hardFound {
			used, usedFound := status.Used[resourceName]
			if !usedFound {
				return false, fmt.Errorf("quota usage stats are not yet known, unable to admit resource until an accurate count is completed.")
			}
			if used.Value() >= hard.Value() {
				errs = append(errs, fmt.Errorf("limited to %s %s", hard.String(), resourceName))
				dirty = false
			} else {
				status.Used[resourceName] = *resource.NewQuantity(used.Value()+int64(1), resource.DecimalSI)
			}
		}
	}

	if a.GetResource() == "pods" {
		for _, resourceName := range []api.ResourceName{api.ResourceMemory, api.ResourceCPU} {

			// ignore tracking the resource if it's not in the quota document
			if !set[resourceName] {
				continue
			}

			hard, hardFound := status.Hard[resourceName]
			if !hardFound {
				continue
			}

			// if we do not yet know how much of the current resource is used, we cannot accept any request
			used, usedFound := status.Used[resourceName]
			if !usedFound {
				return false, fmt.Errorf("unable to admit pod until quota usage stats are calculated.")
			}

			// the amount of resource being requested, or an error if it does not make a request that is tracked
			pod := obj.(*api.Pod)
			delta, err := resourcequotacontroller.PodRequests(pod, resourceName)

			if err != nil {
				return false, fmt.Errorf("must make a non-zero request for %s since it is tracked by quota.", resourceName)
			}

			// if this operation is an update, we need to find the delta usage from the previous state
			if a.GetOperation() == admission.Update {
				oldPod, err := client.Pods(a.GetNamespace()).Get(pod.Name)
				if err != nil {
					return false, err
				}

				// if the previous version of the resource made a resource request, we need to subtract the old request
				// from the current to get the actual resource request delta.  if the previous version of the pod
				// made no request on the resource, then we get an err value.  we ignore the err value, and delta
				// will just be equal to the total resource request on the pod since there is nothing to subtract.
				oldRequest, err := resourcequotacontroller.PodRequests(oldPod, resourceName)
				if err == nil {
					err = delta.Sub(*oldRequest)
					if err != nil {
						return false, err
					}
				}
			}

			newUsage := used.Copy()
			newUsage.Add(*delta)

			// make the most precise comparison possible
			newUsageValue := newUsage.Value()
			hardUsageValue := hard.Value()
			if newUsageValue <= resource.MaxMilliValue && hardUsageValue <= resource.MaxMilliValue {
				newUsageValue = newUsage.MilliValue()
				hardUsageValue = hard.MilliValue()
			}

			if newUsageValue > hardUsageValue {
				errs = append(errs, fmt.Errorf("unable to admit pod without exceeding quota for resource %s:  limited to %s but require %s to succeed.", resourceName, hard.String(), newUsage.String()))
				dirty = false
			} else {
				status.Used[resourceName] = *newUsage
			}

		}
	}

	return dirty, errors.NewAggregate(errs)
}
示例#6
0
func (s *serviceAccount) Admit(a admission.Attributes) (err error) {
	if a.GetResource() != string(api.ResourcePods) {
		return nil
	}
	obj := a.GetObject()
	if obj == nil {
		return nil
	}
	pod, ok := obj.(*api.Pod)
	if !ok {
		return nil
	}

	// Don't modify the spec of mirror pods.
	// That makes the kubelet very angry and confused, and it immediately deletes the pod (because the spec doesn't match)
	// That said, don't allow mirror pods to reference ServiceAccounts or SecretVolumeSources either
	if _, isMirrorPod := pod.Annotations[kubelet.ConfigMirrorAnnotationKey]; isMirrorPod {
		if len(pod.Spec.ServiceAccountName) != 0 {
			return admission.NewForbidden(a, fmt.Errorf("A mirror pod may not reference service accounts"))
		}
		for _, volume := range pod.Spec.Volumes {
			if volume.VolumeSource.Secret != nil {
				return admission.NewForbidden(a, fmt.Errorf("A mirror pod may not reference secrets"))
			}
		}
		return nil
	}

	// Set the default service account if needed
	if len(pod.Spec.ServiceAccountName) == 0 {
		pod.Spec.ServiceAccountName = DefaultServiceAccountName
	}

	// Ensure the referenced service account exists
	serviceAccount, err := s.getServiceAccount(a.GetNamespace(), pod.Spec.ServiceAccountName)
	if err != nil {
		return admission.NewForbidden(a, fmt.Errorf("Error looking up service account %s/%s: %v", a.GetNamespace(), pod.Spec.ServiceAccountName, err))
	}
	if serviceAccount == nil {
		// TODO: convert to a ServerTimeout error (or other error that sends a Retry-After header)
		return admission.NewForbidden(a, fmt.Errorf("service account %s/%s was not found, retry after the service account is created", a.GetNamespace(), pod.Spec.ServiceAccountName))
	}

	if s.LimitSecretReferences {
		if err := s.limitSecretReferences(serviceAccount, pod); err != nil {
			return admission.NewForbidden(a, err)
		}
	}

	if s.MountServiceAccountToken {
		if err := s.mountServiceAccountToken(serviceAccount, pod); err != nil {
			return admission.NewForbidden(a, err)
		}
	}

	if len(pod.Spec.ImagePullSecrets) == 0 {
		pod.Spec.ImagePullSecrets = make([]api.LocalObjectReference, len(serviceAccount.ImagePullSecrets))
		copy(pod.Spec.ImagePullSecrets, serviceAccount.ImagePullSecrets)
	}

	return nil
}