Golang admission.NewForbidden函数代码示例

func (d *sccExecRestrictions) Admit(a admission.Attributes) (err error) {
	if a.GetOperation() != admission.Connect {
		return nil
	}
	if a.GetResource().GroupResource() != kapi.Resource("pods") {
		return nil
	}
	if a.GetSubresource() != "attach" && a.GetSubresource() != "exec" {
		return nil
	}

	pod, err := d.client.Core().Pods(a.GetNamespace()).Get(a.GetName())
	if err != nil {
		return admission.NewForbidden(a, err)
	}

	// TODO, if we want to actually limit who can use which service account, then we'll need to add logic here to make sure that
	// we're allowed to use the SA the pod is using.  Otherwise, user-A creates pod and user-B (who can't use the SA) can exec into it.
	createAttributes := admission.NewAttributesRecord(pod, pod, kapi.Kind("Pod").WithVersion(""), a.GetNamespace(), a.GetName(), a.GetResource(), "", admission.Create, a.GetUserInfo())
	if err := d.constraintAdmission.Admit(createAttributes); err != nil {
		return admission.NewForbidden(a, err)
	}

	return nil
}

func (p *provision) Admit(a admission.Attributes) (err error) {
	// if we're here, then we've already passed authentication, so we're allowed to do what we're trying to do
	// if we're here, then the API server has found a route, which means that if we have a non-empty namespace
	// its a namespaced resource.
	if len(a.GetNamespace()) == 0 || a.GetKind() == api.Kind("Namespace") {
		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.Legacy().Namespaces().Create(namespace)
	if err != nil && !errors.IsAlreadyExists(err) {
		return admission.NewForbidden(a, err)
	}
	return nil
}

func (e *exists) 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 := e.store.Get(namespace)
	if err != nil {
		return admission.NewForbidden(a, err)
	}
	if exists {
		return nil
	}

	// in case of latency in our caches, make a call direct to storage to verify that it truly exists or not
	_, err = e.client.Namespaces().Get(a.GetNamespace())
	if err != nil {
		return admission.NewForbidden(a, fmt.Errorf("Namespace %s does not exist", a.GetNamespace()))
	}

	return nil
}

func (a *runOnceDuration) Admit(attributes admission.Attributes) error {
	switch {
	case a.config == nil,
		!a.config.Enabled,
		attributes.GetResource() != kapi.Resource("pods"),
		len(attributes.GetSubresource()) > 0:
		return nil
	}
	pod, ok := attributes.GetObject().(*kapi.Pod)
	if !ok {
		return admission.NewForbidden(attributes, fmt.Errorf("unexpected object: %#v", attributes.GetObject()))
	}

	// Only update pods with a restart policy of Never or OnFailure
	switch pod.Spec.RestartPolicy {
	case kapi.RestartPolicyNever,
		kapi.RestartPolicyOnFailure:
		// continue
	default:
		return nil
	}

	appliedProjectOverride, err := a.applyProjectAnnotationOverride(attributes.GetNamespace(), pod)
	if err != nil {
		return admission.NewForbidden(attributes, err)
	}

	if !appliedProjectOverride && a.config.ActiveDeadlineSecondsOverride != nil {
		pod.Spec.ActiveDeadlineSeconds = a.config.ActiveDeadlineSecondsOverride
	}
	return nil
}

// validate PodSpec if NodeName or NodeSelector are specified
func (o *podNodeConstraints) admitPodSpec(attr admission.Attributes, ps kapi.PodSpec) error {
	matchingLabels := []string{}
	// nodeSelector blacklist filter
	for nodeSelectorLabel := range ps.NodeSelector {
		if o.selectorLabelBlacklist.Has(nodeSelectorLabel) {
			matchingLabels = append(matchingLabels, nodeSelectorLabel)
		}
	}
	// nodeName constraint
	if len(ps.NodeName) > 0 || len(matchingLabels) > 0 {
		allow, err := o.checkPodsBindAccess(attr)
		if err != nil {
			return err
		}
		if !allow {
			switch {
			case len(ps.NodeName) > 0 && len(matchingLabels) == 0:
				return admission.NewForbidden(attr, fmt.Errorf("node selection by nodeName is prohibited by policy for your role"))
			case len(ps.NodeName) == 0 && len(matchingLabels) > 0:
				return admission.NewForbidden(attr, fmt.Errorf("node selection by label(s) %v is prohibited by policy for your role", matchingLabels))
			case len(ps.NodeName) > 0 && len(matchingLabels) > 0:
				return admission.NewForbidden(attr, fmt.Errorf("node selection by nodeName and label(s) %v is prohibited by policy for your role", matchingLabels))
			}
		}
	}
	return nil
}

// Admit determines if the pod should be admitted based on the requested security context
// and the available SCCs.
//
// 1.  Find SCCs for the user.
// 2.  Find SCCs for the SA.  If there is an error retrieving SA SCCs it is not fatal.
// 3.  Remove duplicates between the user/SA SCCs.
// 4.  Create the providers, includes setting pre-allocated values if necessary.
// 5.  Try to generate and validate an SCC with providers.  If we find one then admit the pod
//     with the validated SCC.  If we don't find any reject the pod and give all errors from the
//     failed attempts.
func (c *constraint) Admit(a kadmission.Attributes) error {
	if a.GetResource().Resource != string(kapi.ResourcePods) {
		return nil
	}

	pod, ok := a.GetObject().(*kapi.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 security context constraints for pod %s (generate: %s) in namespace %s with user info %v", pod.Name, pod.GenerateName, a.GetNamespace(), a.GetUserInfo())
	matchedConstraints, err := getMatchingSecurityContextConstraints(c.store, a.GetUserInfo())
	if err != nil {
		return kadmission.NewForbidden(a, err)
	}

	// get all constraints that are usable by the SA
	if len(pod.Spec.ServiceAccountName) > 0 {
		userInfo := serviceaccount.UserInfo(a.GetNamespace(), pod.Spec.ServiceAccountName, "")
		glog.V(4).Infof("getting security context constraints for pod %s (generate: %s) with service account info %v", pod.Name, pod.GenerateName, userInfo)
		saConstraints, err := getMatchingSecurityContextConstraints(c.store, userInfo)
		if err != nil {
			return kadmission.NewForbidden(a, err)
		}
		matchedConstraints = append(matchedConstraints, saConstraints...)
	}

	// remove duplicate constraints and sort
	matchedConstraints = deduplicateSecurityContextConstraints(matchedConstraints)
	sort.Sort(ByPriority(matchedConstraints))
	providers, errs := c.createProvidersFromConstraints(a.GetNamespace(), matchedConstraints)
	logProviders(pod, providers, errs)

	if len(providers) == 0 {
		return kadmission.NewForbidden(a, fmt.Errorf("no providers available to validated 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.GetSCCName()))); 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.GetSCCName())
		if pod.ObjectMeta.Annotations == nil {
			pod.ObjectMeta.Annotations = map[string]string{}
		}
		pod.ObjectMeta.Annotations[allocator.ValidatedSCCAnnotation] = provider.GetSCCName()
		return nil
	}

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

// 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()
	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 %v at this time because there was an error enforcing limit ranges", a.GetOperation(), a.GetResource()))
	}

	// if there are no items held in our indexer, check our live-lookup LRU, if that misses, do the live lookup to prime it.
	if len(items) == 0 {
		lruItemObj, ok := l.liveLookupCache.Get(a.GetNamespace())
		if !ok || lruItemObj.(liveLookupEntry).expiry.Before(time.Now()) {
			liveList, err := l.client.Core().LimitRanges(a.GetNamespace()).List(api.ListOptions{})
			if err != nil {
				return admission.NewForbidden(a, err)
			}
			newEntry := liveLookupEntry{expiry: time.Now().Add(l.liveTTL)}
			for i := range liveList.Items {
				newEntry.items = append(newEntry.items, &liveList.Items[i])
			}
			l.liveLookupCache.Add(a.GetNamespace(), newEntry)
			lruItemObj = newEntry
		}
		lruEntry := lruItemObj.(liveLookupEntry)

		for i := range lruEntry.items {
			items = append(items, lruEntry.items[i])
		}

	}

	// ensure it meets each prescribed min/max
	for i := range items {
		limitRange := items[i].(*api.LimitRange)
		err = l.limitFunc(limitRange, a.GetResource().Resource, a.GetObject())
		if err != nil {
			return admission.NewForbidden(a, err)
		}
	}
	return nil
}

func (p *provision) Admit(a admission.Attributes) (err error) {
	// if we're here, then we've already passed authentication, so we're allowed to do what we're trying to do
	// if we're here, then the API server has found a route, which means that if we have a non-empty namespace
	// its a namespaced resource.
	if len(a.GetNamespace()) == 0 || a.GetKind().GroupKind() == api.Kind("Namespace") {
		return nil
	}
	// we need to wait for our caches to warm
	if !p.WaitForReady() {
		return admission.NewForbidden(a, fmt.Errorf("not yet ready to handle request"))
	}
	namespace := &api.Namespace{
		ObjectMeta: api.ObjectMeta{
			Name:      a.GetNamespace(),
			Namespace: "",
		},
		Status: api.NamespaceStatus{},
	}
	_, exists, err := p.namespaceInformer.GetStore().Get(namespace)
	if err != nil {
		return admission.NewForbidden(a, err)
	}
	if exists {
		return nil
	}
	_, err = p.client.Core().Namespaces().Create(namespace)
	if err != nil && !errors.IsAlreadyExists(err) {
		return admission.NewForbidden(a, err)
	}
	return nil
}

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.SecurityContext != nil && pod.Spec.SecurityContext.HostPID {
		return admission.NewForbidden(a, fmt.Errorf("Cannot exec into or attach to a container using host pid"))
	}

	if d.hostIPC && pod.Spec.SecurityContext != nil && pod.Spec.SecurityContext.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
}

func (d *sccExecRestrictions) Admit(a admission.Attributes) (err error) {
	if a.GetOperation() != admission.Connect {
		return nil
	}
	if a.GetResource() != kapi.Resource("pods") {
		return nil
	}
	if a.GetSubresource() != "attach" && a.GetSubresource() != "exec" {
		return nil
	}

	pod, err := d.client.Pods(a.GetNamespace()).Get(a.GetName())
	if err != nil {
		return admission.NewForbidden(a, err)
	}

	// create a synthentic admission attribute to check SCC admission status for this pod
	// clear the SA name, so that any permissions MUST be based on your user's power, not the SAs power.
	pod.Spec.ServiceAccountName = ""
	createAttributes := admission.NewAttributesRecord(pod, kapi.Kind("Pod"), a.GetNamespace(), a.GetName(), a.GetResource(), a.GetSubresource(), admission.Create, a.GetUserInfo())
	if err := d.constraintAdmission.Admit(createAttributes); err != nil {
		return admission.NewForbidden(a, err)
	}

	return nil
}

func (p *provision) Admit(a admission.Attributes) (err error) {
	gvk, err := api.RESTMapper.KindFor(a.GetResource())
	if err != nil {
		return admission.NewForbidden(a, err)
	}
	mapping, err := api.RESTMapper.RESTMapping(gvk.GroupKind(), gvk.Version)
	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
}

// Admit enforces that a namespace must exist in order to associate content with it.
// Admit enforces that a namespace that is terminating cannot accept new content being associated with it.
func (e *lifecycle) Admit(a admission.Attributes) (err error) {
	if len(a.GetNamespace()) == 0 {
		return nil
	}
	// always allow a SAR request through, the SAR will return information about
	// the ability to take action on the object, no need to verify it here.
	if isSubjectAccessReview(a) {
		return nil
	}

	groupMeta, err := registered.Group(a.GetKind().Group)
	if err != nil {
		return err
	}
	mapping, err := groupMeta.RESTMapper.RESTMapping(a.GetKind().GroupKind())
	if err != nil {
		glog.V(4).Infof("Ignoring life-cycle enforcement for resource %v; no associated default version and kind could be found.", a.GetResource())
		return nil
	}
	if mapping.Scope.Name() != meta.RESTScopeNameNamespace {
		return nil
	}

	if !e.cache.Running() {
		return admission.NewForbidden(a, err)
	}

	namespace, err := e.cache.GetNamespace(a.GetNamespace())
	if err != nil {
		return admission.NewForbidden(a, err)
	}

	// in case of concurrency issues, we will retry this logic
	numRetries := 10
	interval := time.Duration(rand.Int63n(90)+int64(10)) * time.Millisecond
	for retry := 1; retry <= numRetries; retry++ {

		// associate this namespace with openshift
		_, err = projectutil.Associate(e.client, namespace)
		if err == nil {
			break
		}

		// we have exhausted all reasonable efforts to retry so give up now
		if retry == numRetries {
			return admission.NewForbidden(a, err)
		}

		// get the latest namespace for the next pass in case of resource version updates
		time.Sleep(interval)

		// it's possible the namespace actually was deleted, so just forbid if this occurs
		namespace, err = e.client.Core().Namespaces().Get(a.GetNamespace())
		if err != nil {
			return admission.NewForbidden(a, err)
		}
	}
	return nil
}

// TODO this will need to update when we have pod requests/limits
func (a *clusterResourceOverridePlugin) Admit(attr admission.Attributes) error {
	glog.V(6).Infof("%s admission controller is invoked", api.PluginName)
	if a.config == nil || attr.GetResource() != kapi.Resource("pods") || attr.GetSubresource() != "" {
		return nil // not applicable
	}
	pod, ok := attr.GetObject().(*kapi.Pod)
	if !ok {
		return admission.NewForbidden(attr, fmt.Errorf("unexpected object: %#v", attr.GetObject()))
	}
	glog.V(5).Infof("%s is looking at creating pod %s in project %s", api.PluginName, pod.Name, attr.GetNamespace())

	// allow annotations on project to override
	if ns, err := a.ProjectCache.GetNamespace(attr.GetNamespace()); err != nil {
		glog.Warningf("%s got an error retrieving namespace: %v", api.PluginName, err)
		return admission.NewForbidden(attr, err) // this should not happen though
	} else {
		projectEnabledPlugin, exists := ns.Annotations[clusterResourceOverrideAnnotation]
		if exists && projectEnabledPlugin != "true" {
			glog.V(5).Infof("%s is disabled for project %s", api.PluginName, attr.GetNamespace())
			return nil // disabled for this project, do nothing
		}
	}

	// Reuse LimitRanger logic to apply limit/req defaults from the project. Ignore validation
	// errors, assume that LimitRanger will run after this plugin to validate.
	glog.V(5).Infof("%s: initial pod limits are: %#v", api.PluginName, pod.Spec.Containers[0].Resources)
	if err := a.LimitRanger.Admit(attr); err != nil {
		glog.V(5).Infof("%s: error from LimitRanger: %#v", api.PluginName, err)
	}
	glog.V(5).Infof("%s: pod limits after LimitRanger are: %#v", api.PluginName, pod.Spec.Containers[0].Resources)
	for _, container := range pod.Spec.Containers {
		resources := container.Resources
		memLimit, memFound := resources.Limits[kapi.ResourceMemory]
		if memFound && a.config.memoryRequestToLimitRatio.Cmp(zeroDec) != 0 {
			resources.Requests[kapi.ResourceMemory] = resource.Quantity{
				Amount: multiply(memLimit.Amount, a.config.memoryRequestToLimitRatio),
				Format: resource.BinarySI,
			}
		}
		if memFound && a.config.limitCPUToMemoryRatio.Cmp(zeroDec) != 0 {
			resources.Limits[kapi.ResourceCPU] = resource.Quantity{
				// float math is necessary here as there is no way to create an inf.Dec to represent cpuBaseScaleFactor < 0.001
				Amount: multiply(inf.NewDec(int64(float64(memLimit.Value())*cpuBaseScaleFactor), 3), a.config.limitCPUToMemoryRatio),
				Format: resource.DecimalSI,
			}
		}
		cpuLimit, cpuFound := resources.Limits[kapi.ResourceCPU]
		if cpuFound && a.config.cpuRequestToLimitRatio.Cmp(zeroDec) != 0 {
			resources.Requests[kapi.ResourceCPU] = resource.Quantity{
				Amount: multiply(cpuLimit.Amount, a.config.cpuRequestToLimitRatio),
				Format: resource.DecimalSI,
			}
		}
	}
	glog.V(5).Infof("%s: pod limits after overrides are: %#v", api.PluginName, pod.Spec.Containers[0].Resources)
	return nil
}

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 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
	}
	namespaceObj, exists, err := l.store.Get(&api.Namespace{
		ObjectMeta: api.ObjectMeta{
			Name:      a.GetNamespace(),
			Namespace: "",
		},
	})
	if err != nil {
		return admission.NewForbidden(a, 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 {
			return admission.NewForbidden(a, fmt.Errorf("Namespace %s does not exist", a.GetNamespace()))
		}
	}

	// 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
		}

		return admission.NewForbidden(a, fmt.Errorf("Unable to create new content in namespace %s because it is being terminated.", a.GetNamespace()))
	}

	return nil
}

func (l *lifecycle) Admit(a admission.Attributes) (err error) {
	// prevent deletion of immortal namespaces
	if a.GetOperation() == admission.Delete && a.GetKind().GroupKind() == api.Kind("Namespace") && l.immortalNamespaces.Has(a.GetName()) {
		return errors.NewForbidden(a.GetResource().GroupResource(), a.GetName(), fmt.Errorf("this namespace may not be deleted"))
	}

	// if we're here, then we've already passed authentication, so we're allowed to do what we're trying to do
	// if we're here, then the API server has found a route, which means that if we have a non-empty namespace
	// its a namespaced resource.
	if len(a.GetNamespace()) == 0 || a.GetKind().GroupKind() == api.Kind("Namespace") {
		// if a namespace is deleted, we want to prevent all further creates into it
		// while it is undergoing termination.  to reduce incidences where the cache
		// is slow to update, we forcefully remove the namespace from our local cache.
		// this will cause a live lookup of the namespace to get its latest state even
		// before the watch notification is received.
		if a.GetOperation() == admission.Delete {
			l.store.Delete(&api.Namespace{
				ObjectMeta: api.ObjectMeta{
					Name: a.GetName(),
				},
			})
		}
		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.Core().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
}