func (e *exists) Admit(a admission.Attributes) (err error) {
defaultVersion, kind, err := latest.RESTMapper.VersionAndKindForResource(a.GetResource())
if err != nil {
return err
}
mapping, err := latest.RESTMapper.RESTMapping(kind, defaultVersion)
if err != nil {
return 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 err
}
if exists {
return nil
}
obj := a.GetObject()
name := "Unknown"
if obj != nil {
name, _ = meta.NewAccessor().Name(obj)
}
return apierrors.NewForbidden(kind, name, fmt.Errorf("Namespace %s does not exist", a.GetNamespace()))
}
// 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() != 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(ByRestrictions(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 := fielderrors.ValidationErrorList{}
for _, provider := range providers {
if errs := assignSecurityContext(provider, pod); len(errs) > 0 {
validationErrs = append(validationErrs, errs.Prefix(fmt.Sprintf("provider %s: ", provider.GetSCCName()))...)
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))
}
func (resourceDefaults) Admit(a admission.Attributes) (err error) {
// ignore deletes, only process create and update
if a.GetOperation() == "DELETE" {
return nil
}
// we only care about pods
if a.GetResource() != "pods" {
return nil
}
// get the pod, so we can validate each of the containers within have default mem / cpu constraints
obj := a.GetObject()
pod := obj.(*api.Pod)
for index := range pod.Spec.Containers {
if pod.Spec.Containers[index].Resources.Limits == nil {
pod.Spec.Containers[index].Resources.Limits = api.ResourceList{}
}
if pod.Spec.Containers[index].Resources.Limits.Memory().Value() == 0 {
pod.Spec.Containers[index].Resources.Limits[api.ResourceMemory] = resource.MustParse(defaultMemory)
}
if pod.Spec.Containers[index].Resources.Limits.Cpu().Value() == 0 {
pod.Spec.Containers[index].Resources.Limits[api.ResourceCPU] = resource.MustParse(defaultCPU)
}
}
return nil
}
// Admit admits resources into cluster that do not violate any defined LimitRange in the namespace
func (l *limitRanger) Admit(a admission.Attributes) (err error) {
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
}
func (d *denyExecOnPrivileged) 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 requests on pods
if connectRequest.ResourcePath != "pods/exec" {
return nil
}
pod, err := d.client.Pods(a.GetNamespace()).Get(connectRequest.Name)
if err != nil {
return admission.NewForbidden(a, err)
}
if isPrivileged(pod) {
return admission.NewForbidden(a, fmt.Errorf("Cannot exec into a privileged container"))
}
return nil
}
// 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
}
// Admit enforces that pod and its project node label selectors matches at least a node in the cluster.
func (p *podNodeEnvironment) Admit(a admission.Attributes) (err error) {
// ignore anything except create or update of pods
if !(a.GetOperation() == admission.Create || a.GetOperation() == admission.Update) {
return nil
}
resource := a.GetResource()
if resource != "pods" {
return nil
}
obj := a.GetObject()
pod, ok := obj.(*kapi.Pod)
if !ok {
return nil
}
name := pod.Name
projects, err := projectcache.GetProjectCache()
if err != nil {
return err
}
namespace, err := projects.GetNamespaceObject(a.GetNamespace())
if err != nil {
return apierrors.NewForbidden(resource, name, err)
}
projectNodeSelector, err := projects.GetNodeSelectorMap(namespace)
if err != nil {
return err
}
if labelselector.Conflicts(projectNodeSelector, pod.Spec.NodeSelector) {
return apierrors.NewForbidden(resource, name, fmt.Errorf("pod node label selector conflicts with its project node label selector"))
}
// modify pod node selector = project node selector + current pod node selector
pod.Spec.NodeSelector = labelselector.Merge(projectNodeSelector, pod.Spec.NodeSelector)
return nil
}
func (a *buildByStrategy) Admit(attr admission.Attributes) error {
if resource := attr.GetResource(); resource != buildsResource && resource != buildConfigsResource {
return nil
}
var err error
switch obj := attr.GetObject().(type) {
case *buildapi.Build:
err = a.checkBuildAuthorization(obj, attr)
case *buildapi.BuildConfig:
err = a.checkBuildConfigAuthorization(obj, attr)
}
return err
}
// 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
}
defaultVersion, kind, err := latest.RESTMapper.VersionAndKindForResource(a.GetResource())
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
}
mapping, err := latest.RESTMapper.RESTMapping(kind, defaultVersion)
if err != nil {
return admission.NewForbidden(a, err)
}
if mapping.Scope.Name() != meta.RESTScopeNameNamespace {
return nil
}
// we want to allow someone to delete something in case it was phantom created somehow
if a.GetOperation() == "DELETE" {
return nil
}
name := "Unknown"
obj := a.GetObject()
if obj != nil {
name, _ = meta.NewAccessor().Name(obj)
}
projects, err := cache.GetProjectCache()
if err != nil {
return admission.NewForbidden(a, err)
}
namespace, err := projects.GetNamespaceObject(a.GetNamespace())
if err != nil {
return admission.NewForbidden(a, err)
}
if a.GetOperation() != "CREATE" {
return nil
}
if namespace.Status.Phase == kapi.NamespaceTerminating && !e.creatableResources.Has(strings.ToLower(a.GetResource())) {
return apierrors.NewForbidden(kind, name, fmt.Errorf("Namespace %s is terminating", a.GetNamespace()))
}
// 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.Namespaces().Get(a.GetNamespace())
if err != nil {
return admission.NewForbidden(a, err)
}
}
return nil
}
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
}
// 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) {
dirty := false
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() {
return false, fmt.Errorf("Limited to %s %s", hard.String(), resourceName)
} else {
status.Used[resourceName] = *resource.NewQuantity(used.Value()+int64(1), resource.DecimalSI)
dirty = true
}
}
}
// handle memory/cpu constraints, and any diff of usage based on memory/cpu on updates
if a.GetResource() == "pods" && (set[api.ResourceMemory] || set[api.ResourceCPU]) {
pod := obj.(*api.Pod)
deltaCPU := resourcequotacontroller.PodCPU(pod)
deltaMemory := resourcequotacontroller.PodMemory(pod)
// if this is an update, we need to find the delta cpu/memory usage from previous state
if a.GetOperation() == admission.Update {
oldPod, err := client.Pods(a.GetNamespace()).Get(pod.Name)
if err != nil {
return false, err
}
oldCPU := resourcequotacontroller.PodCPU(oldPod)
oldMemory := resourcequotacontroller.PodMemory(oldPod)
deltaCPU = resource.NewMilliQuantity(deltaCPU.MilliValue()-oldCPU.MilliValue(), resource.DecimalSI)
deltaMemory = resource.NewQuantity(deltaMemory.Value()-oldMemory.Value(), resource.DecimalSI)
}
hardMem, hardMemFound := status.Hard[api.ResourceMemory]
if hardMemFound {
if set[api.ResourceMemory] && resourcequotacontroller.IsPodMemoryUnbounded(pod) {
return false, fmt.Errorf("Limited to %s memory, but pod has no specified memory limit", hardMem.String())
}
used, usedFound := status.Used[api.ResourceMemory]
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()+deltaMemory.Value() > hardMem.Value() {
return false, fmt.Errorf("Limited to %s memory", hardMem.String())
} else {
status.Used[api.ResourceMemory] = *resource.NewQuantity(used.Value()+deltaMemory.Value(), resource.DecimalSI)
dirty = true
}
}
hardCPU, hardCPUFound := status.Hard[api.ResourceCPU]
if hardCPUFound {
if set[api.ResourceCPU] && resourcequotacontroller.IsPodCPUUnbounded(pod) {
return false, fmt.Errorf("Limited to %s CPU, but pod has no specified cpu limit", hardCPU.String())
}
used, usedFound := status.Used[api.ResourceCPU]
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.MilliValue()+deltaCPU.MilliValue() > hardCPU.MilliValue() {
return false, fmt.Errorf("Limited to %s CPU", hardCPU.String())
} else {
status.Used[api.ResourceCPU] = *resource.NewMilliQuantity(used.MilliValue()+deltaCPU.MilliValue(), resource.DecimalSI)
dirty = true
}
}
}
return dirty, nil
}
