コード例 #1
0
ファイル: admission.go プロジェクト: qinguoan/vulcan
func (p *provision) Admit(a admission.Attributes) (err error) {
	defaultVersion, kind, err := api.RESTMapper.VersionAndKindForResource(a.GetResource())
	if err != nil {
		return admission.NewForbidden(a, err)
	}
	mapping, err := api.RESTMapper.RESTMapping(kind, defaultVersion)
	if err != nil {
		return admission.NewForbidden(a, err)
	}
	if mapping.Scope.Name() != meta.RESTScopeNameNamespace {
		return nil
	}
	namespace := &api.Namespace{
		ObjectMeta: api.ObjectMeta{
			Name:      a.GetNamespace(),
			Namespace: "",
		},
		Status: api.NamespaceStatus{},
	}
	_, exists, err := p.store.Get(namespace)
	if err != nil {
		return admission.NewForbidden(a, err)
	}
	if exists {
		return nil
	}
	_, err = p.client.Namespaces().Create(namespace)
	if err != nil && !errors.IsAlreadyExists(err) {
		return admission.NewForbidden(a, err)
	}
	return nil
}
コード例 #2
0
ファイル: admission.go プロジェクト: qinguoan/vulcan
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
}
コード例 #3
0
ファイル: admission.go プロジェクト: qinguoan/vulcan
// 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
}
コード例 #4
0
ファイル: admission.go プロジェクト: qinguoan/vulcan
func (l *lifecycle) Admit(a admission.Attributes) (err error) {

	// prevent deletion of immortal namespaces
	if a.GetOperation() == admission.Delete && a.GetKind() == "Namespace" && l.immortalNamespaces.Has(a.GetName()) {
		return errors.NewForbidden(a.GetKind(), a.GetName(), fmt.Errorf("namespace can never be deleted"))
	}

	defaultVersion, kind, err := api.RESTMapper.VersionAndKindForResource(a.GetResource())
	if err != nil {
		return errors.NewInternalError(err)
	}
	mapping, err := api.RESTMapper.RESTMapping(kind, defaultVersion)
	if err != nil {
		return errors.NewInternalError(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 errors.NewInternalError(err)
	}

	// refuse to operate on non-existent namespaces
	if !exists {
		// in case of latency in our caches, make a call direct to storage to verify that it truly exists or not
		namespaceObj, err = l.client.Namespaces().Get(a.GetNamespace())
		if err != nil {
			if errors.IsNotFound(err) {
				return err
			}
			return errors.NewInternalError(err)
		}
	}

	// ensure that we're not trying to create objects in terminating namespaces
	if a.GetOperation() == admission.Create {
		namespace := namespaceObj.(*api.Namespace)
		if namespace.Status.Phase != api.NamespaceTerminating {
			return nil
		}

		// TODO: This should probably not be a 403
		return admission.NewForbidden(a, fmt.Errorf("Unable to create new content in namespace %s because it is being terminated.", a.GetNamespace()))
	}

	return nil
}
コード例 #5
0
ファイル: admission.go プロジェクト: qinguoan/vulcan
func (q *quota) Admit(a admission.Attributes) (err error) {
	if a.GetSubresource() != "" {
		return nil
	}

	if a.GetOperation() == "DELETE" {
		return nil
	}

	key := &api.ResourceQuota{
		ObjectMeta: api.ObjectMeta{
			Namespace: a.GetNamespace(),
			Name:      "",
		},
	}

	// concurrent operations that modify quota tracked resources can cause a conflict when incrementing usage
	// as a result, we will attempt to increment quota usage per request up to numRetries limit
	// we fuzz each retry with an interval period to attempt to improve end-user experience during concurrent operations
	numRetries := 10
	interval := time.Duration(rand.Int63n(90)+int64(10)) * time.Millisecond

	items, err := q.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 quota", a.GetOperation(), a.GetResource()))
	}
	if len(items) == 0 {
		return nil
	}

	for i := range items {

		quota := items[i].(*api.ResourceQuota)

		for retry := 1; retry <= numRetries; retry++ {

			// we cannot modify the value directly in the cache, so we copy
			status := &api.ResourceQuotaStatus{
				Hard: api.ResourceList{},
				Used: api.ResourceList{},
			}
			for k, v := range quota.Status.Hard {
				status.Hard[k] = *v.Copy()
			}
			for k, v := range quota.Status.Used {
				status.Used[k] = *v.Copy()
			}

			dirty, err := IncrementUsage(a, status, q.client)
			if err != nil {
				return admission.NewForbidden(a, err)
			}

			if dirty {
				// construct a usage record
				usage := api.ResourceQuota{
					ObjectMeta: api.ObjectMeta{
						Name:            quota.Name,
						Namespace:       quota.Namespace,
						ResourceVersion: quota.ResourceVersion,
						Labels:          quota.Labels,
						Annotations:     quota.Annotations},
				}
				usage.Status = *status
				_, err = q.client.ResourceQuotas(usage.Namespace).UpdateStatus(&usage)
				if err == nil {
					break
				}

				// we have concurrent requests to update quota, so look to retry if needed
				if retry == numRetries {
					return admission.NewForbidden(a, fmt.Errorf("unable to %s %s at this time because there are too many concurrent requests to increment quota", a.GetOperation(), a.GetResource()))
				}
				time.Sleep(interval)
				// manually get the latest quota
				quota, err = q.client.ResourceQuotas(usage.Namespace).Get(quota.Name)
				if err != nil {
					return admission.NewForbidden(a, err)
				}
			}
		}
	}
	return nil
}
コード例 #6
0
ファイル: admission.go プロジェクト: qinguoan/vulcan
func (alwaysDeny) Admit(a admission.Attributes) (err error) {
	return admission.NewForbidden(a, errors.New("Admission control is denying all modifications"))
}
コード例 #7
0
ファイル: admission.go プロジェクト: qinguoan/vulcan
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
}