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
}
// SupportsAttributes ignores all calls that do not deal with pod resources since that is
// all this supports now. 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")
}
// SupportsAttributes is a helper that returns true if the resource is supported by the plugin.
// Implements the LimitRangerActions interface.
func (a *imageLimitRangerPlugin) SupportsAttributes(attr kadmission.Attributes) bool {
if attr.GetSubresource() != "" {
return false
}
return attr.GetKind().GroupKind() == imageapi.Kind("ImageStreamMapping")
}
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
}
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 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 (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
}
// Admit will deny any pod that defines AntiAffinity topology key other than unversioned.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, err := api.GetAffinityFromPodAnnotations(pod.Annotations)
if err != nil {
glog.V(5).Infof("Invalid Affinity detected, but we will leave handling of this to validation phase")
return nil
}
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 != unversioned.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, unversioned.LabelHostname))
}
}
}
return nil
}
// Admit makes admission decisions while enforcing quota
func (q *quotaAdmission) Admit(a admission.Attributes) (err error) {
// ignore all operations that correspond to sub-resource actions
if a.GetSubresource() != "" {
return nil
}
return q.evaluator.Evaluate(a)
}
// 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
}
// IsBuildPod returns true if a pod is a pod generated for a Build
func IsBuildPod(a admission.Attributes) bool {
if a.GetResource() != kapi.Resource("pods") {
return false
}
if len(a.GetSubresource()) != 0 {
return false
}
pod, err := GetPod(a)
if err != nil {
return false
}
return hasBuildAnnotation(pod) && hasBuildEnvVar(pod)
}
// Admit makes admission decisions while enforcing quota
func (q *quotaAdmission) Admit(a admission.Attributes) (err error) {
startTime := time.Now()
defer func() {
duration := time.Now().Sub(startTime)
runningTotal = duration + runningTotal
}()
// ignore all operations that correspond to sub-resource actions
if a.GetSubresource() != "" {
return nil
}
return q.evaluator.Evaluate(a)
}
func (ir initialResources) Admit(a admission.Attributes) (err error) {
// Ignore all calls to subresources or resources other than pods.
if a.GetSubresource() != "" || a.GetResource() != 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")
}
ir.estimateAndFillResourcesIfNotSet(pod)
return nil
}
// 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
}
func (a *alwaysPullImages) Admit(attributes admission.Attributes) (err error) {
// Ignore all calls to subresources or resources other than pods.
if len(attributes.GetSubresource()) != 0 || attributes.GetResource() != 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")
}
for i := range pod.Spec.Containers {
pod.Spec.Containers[i].ImagePullPolicy = api.PullAlways
}
return nil
}
func (a *buildByStrategy) Admit(attr admission.Attributes) error {
if resource := attr.GetResource().GroupResource(); resource != buildsResource && resource != buildConfigsResource {
return nil
}
// Explicitly exclude the builds/details subresource because it's only
// updating commit info and cannot change build type.
if attr.GetResource().GroupResource() == buildsResource && attr.GetSubresource() == "details" {
return nil
}
switch obj := attr.GetObject().(type) {
case *buildapi.Build:
return a.checkBuildAuthorization(obj, attr)
case *buildapi.BuildConfig:
return a.checkBuildConfigAuthorization(obj, attr)
case *buildapi.BuildRequest:
return a.checkBuildRequestAuthorization(obj, attr)
default:
return admission.NewForbidden(attr, fmt.Errorf("unrecognized request object %#v", obj))
}
}
// 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
}
// Admit makes admission decisions while enforcing clusterQuota
func (q *clusterQuotaAdmission) Admit(a admission.Attributes) (err error) {
// ignore all operations that correspond to sub-resource actions
if len(a.GetSubresource()) != 0 {
return nil
}
// ignore cluster level resources
if len(a.GetNamespace()) == 0 {
return nil
}
if !q.waitForSyncedStore(time.After(timeToWaitForCacheSync)) {
return admission.NewForbidden(a, errors.New("caches not synchronized"))
}
q.init.Do(func() {
clusterQuotaAccessor := newQuotaAccessor(q.clusterQuotaLister, q.namespaceLister, q.clusterQuotaClient, q.clusterQuotaMapper)
q.evaluator = resourcequota.NewQuotaEvaluator(clusterQuotaAccessor, q.registry, q.lockAquisition, numEvaluatorThreads, utilwait.NeverStop)
})
return q.evaluator.Evaluate(a)
}
// 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) {
resource := a.GetResource()
if resource != "pods" {
return nil
}
if a.GetSubresource() != "" {
// only run the checks below on pods proper and not subresources
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
}
// 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
}
_, found := pvc.Annotations[classAnnotation]
if found {
// 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[classAnnotation] = def.Name
return nil
}
// Admit attempts to apply the image policy to the incoming resource.
func (a *imagePolicyPlugin) Admit(attr admission.Attributes) error {
switch attr.GetOperation() {
case admission.Create, admission.Update:
if len(attr.GetSubresource()) > 0 {
return nil
}
// only create and update are tested, and only on core resources
// TODO: scan all resources
// TODO: Create a general equivalence map for admission - operation X on subresource Y is equivalent to reduced operation
default:
return nil
}
gr := attr.GetResource().GroupResource()
if !a.accepter.Covers(gr) {
return nil
}
m, err := meta.GetImageReferenceMutator(attr.GetObject())
if err != nil {
return apierrs.NewForbidden(gr, attr.GetName(), fmt.Errorf("unable to apply image policy against objects of type %T: %v", attr.GetObject(), err))
}
// load exclusion rules from the namespace cache
var excluded sets.String
if ns := attr.GetNamespace(); len(ns) > 0 {
if ns, err := a.projectCache.GetNamespace(ns); err == nil {
if value := ns.Annotations[api.IgnorePolicyRulesAnnotation]; len(value) > 0 {
excluded = sets.NewString(strings.Split(value, ",")...)
}
}
}
if err := accept(a.accepter, a.resolver, m, attr, excluded); err != nil {
return err
}
return nil
}
// Admit makes admission decisions while enforcing quota
func (q *quotaAdmission) Admit(a admission.Attributes) (err error) {
// ignore all operations that correspond to sub-resource actions
if a.GetSubresource() != "" {
return nil
}
// if we do not know how to evaluate use for this kind, just ignore
evaluators := q.evaluator.registry.Evaluators()
evaluator, found := evaluators[a.GetKind().GroupKind()]
if !found {
return nil
}
// for this kind, check if the operation could mutate any quota resources
// if no resources tracked by quota are impacted, then just return
op := a.GetOperation()
operationResources := evaluator.OperationResources(op)
if len(operationResources) == 0 {
return nil
}
return q.evaluator.evaluate(a)
}
func (o *podNodeConstraints) Admit(attr admission.Attributes) error {
switch {
case o.config == nil,
attr.GetSubresource() != "":
return nil
}
shouldCheck, err := shouldCheckResource(attr.GetResource().GroupResource(), attr.GetKind().GroupKind())
if err != nil {
return err
}
if !shouldCheck {
return nil
}
// Only check Create operation on pods
if attr.GetResource().GroupResource() == kapi.Resource("pods") && attr.GetOperation() != admission.Create {
return nil
}
ps, err := o.getPodSpec(attr)
if err == nil {
return o.admitPodSpec(attr, ps)
}
return err
}
func (a *imagePolicyWebhook) Admit(attributes admission.Attributes) (err error) {
// Ignore all calls to subresources or resources other than pods.
allowedResources := map[unversioned.GroupResource]bool{
api.Resource("pods"): true,
}
if len(attributes.GetSubresource()) != 0 || !allowedResources[attributes.GetResource().GroupResource()] {
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")
}
// Build list of ImageReviewContainerSpec
var imageReviewContainerSpecs []v1alpha1.ImageReviewContainerSpec
containers := make([]api.Container, 0, len(pod.Spec.Containers)+len(pod.Spec.InitContainers))
containers = append(containers, pod.Spec.Containers...)
containers = append(containers, pod.Spec.InitContainers...)
for _, c := range containers {
imageReviewContainerSpecs = append(imageReviewContainerSpecs, v1alpha1.ImageReviewContainerSpec{
Image: c.Image,
})
}
imageReview := v1alpha1.ImageReview{
Spec: v1alpha1.ImageReviewSpec{
Containers: imageReviewContainerSpecs,
Annotations: a.filterAnnotations(pod.Annotations),
Namespace: attributes.GetNamespace(),
},
}
if err := a.admitPod(attributes, &imageReview); err != nil {
return admission.NewForbidden(attributes, err)
}
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)
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))
}
func (a *jenkinsBootstrapper) Admit(attributes admission.Attributes) error {
if a.jenkinsConfig.AutoProvisionEnabled != nil && !*a.jenkinsConfig.AutoProvisionEnabled {
return nil
}
if len(attributes.GetSubresource()) != 0 {
return nil
}
if attributes.GetResource().GroupResource() != buildapi.Resource("buildconfigs") && attributes.GetResource().GroupResource() != buildapi.Resource("builds") {
return nil
}
if !needsJenkinsTemplate(attributes.GetObject()) {
return nil
}
namespace := attributes.GetNamespace()
svcName := a.jenkinsConfig.ServiceName
if len(svcName) == 0 {
return nil
}
// TODO pull this from a cache.
if _, err := a.serviceClient.Services(namespace).Get(svcName); !kapierrors.IsNotFound(err) {
// if it isn't a "not found" error, return the error. Either its nil and there's nothing to do or something went really wrong
return err
}
glog.V(3).Infof("Adding new jenkins service %q to the project %q", svcName, namespace)
jenkinsTemplate := jenkinscontroller.NewPipelineTemplate(namespace, a.jenkinsConfig, a.openshiftClient)
objects, errs := jenkinsTemplate.Process()
if len(errs) > 0 {
return kutilerrors.NewAggregate(errs)
}
if !jenkinsTemplate.HasJenkinsService(objects) {
return fmt.Errorf("template %s/%s does not contain required service %q", a.jenkinsConfig.TemplateNamespace, a.jenkinsConfig.TemplateName, a.jenkinsConfig.ServiceName)
}
impersonatingConfig := a.privilegedRESTClientConfig
oldWrapTransport := impersonatingConfig.WrapTransport
impersonatingConfig.WrapTransport = func(rt http.RoundTripper) http.RoundTripper {
return authenticationclient.NewImpersonatingRoundTripper(attributes.GetUserInfo(), oldWrapTransport(rt))
}
var bulkErr error
bulk := &cmd.Bulk{
Mapper: &resource.Mapper{
RESTMapper: registered.RESTMapper(),
ObjectTyper: kapi.Scheme,
ClientMapper: resource.ClientMapperFunc(func(mapping *meta.RESTMapping) (resource.RESTClient, error) {
if latest.OriginKind(mapping.GroupVersionKind) {
return client.New(&impersonatingConfig)
}
return kclient.New(&impersonatingConfig)
}),
},
Op: cmd.Create,
After: func(info *resource.Info, err error) bool {
if kapierrors.IsAlreadyExists(err) {
return false
}
if err != nil {
bulkErr = err
return true
}
return false
},
}
// we're intercepting the error we care about using After
bulk.Run(objects, namespace)
if bulkErr != nil {
return bulkErr
}
glog.V(1).Infof("Jenkins Pipeline service %q created", svcName)
return nil
}
// Admit enforces that pod and its namespace node label selectors matches at least a node in the cluster.
func (p *podNodeSelector) Admit(a admission.Attributes) error {
resource := a.GetResource().GroupResource()
if resource != api.Resource("pods") {
return nil
}
if a.GetSubresource() != "" {
// only run the checks below on pods proper and not subresources
return nil
}
obj := a.GetObject()
pod, ok := obj.(*api.Pod)
if !ok {
glog.Errorf("expected pod but got %s", a.GetKind().Kind)
return nil
}
if !p.WaitForReady() {
return admission.NewForbidden(a, fmt.Errorf("not yet ready to handle request"))
}
name := pod.Name
nsName := a.GetNamespace()
var namespace *api.Namespace
namespaceObj, exists, err := p.namespaceInformer.GetStore().Get(&api.Namespace{
ObjectMeta: api.ObjectMeta{
Name: nsName,
Namespace: "",
},
})
if err != nil {
return errors.NewInternalError(err)
}
if exists {
namespace = namespaceObj.(*api.Namespace)
} else {
namespace, err = p.defaultGetNamespace(nsName)
if err != nil {
if errors.IsNotFound(err) {
return err
}
return errors.NewInternalError(err)
}
}
namespaceNodeSelector, err := p.getNodeSelectorMap(namespace)
if err != nil {
return err
}
if labels.Conflicts(namespaceNodeSelector, labels.Set(pod.Spec.NodeSelector)) {
return errors.NewForbidden(resource, name, fmt.Errorf("pod node label selector conflicts with its namespace node label selector"))
}
whitelist, err := labels.ConvertSelectorToLabelsMap(p.clusterNodeSelectors[namespace.Name])
if err != nil {
return err
}
// Merge pod node selector = namespace node selector + current pod node selector
podNodeSelectorLabels := labels.Merge(namespaceNodeSelector, pod.Spec.NodeSelector)
// whitelist verification
if !labels.AreLabelsInWhiteList(podNodeSelectorLabels, whitelist) {
return errors.NewForbidden(resource, name, fmt.Errorf("pod node label selector labels conflict with its namespace whitelist"))
}
// Updated pod node selector = namespace node selector + current pod node selector
pod.Spec.NodeSelector = map[string]string(podNodeSelectorLabels)
return nil
}
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
}
// 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
}
// ignore all calls that do not deal with pod resources since that is all this supports now.
if a.GetKind() != api.Kind("Pod") {
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()) {
// TODO: If there are multiple operations at the same time and cache has just expired,
// this may cause multiple List operations being issued at the same time.
// If there is already in-flight List() for a given namespace, we should wait until
// it is finished and cache is updated instead of doing the same, also to avoid
// throttling - see #22422 for details.
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
}
// Admit makes admission decisions while enforcing quota
func (q *quotaAdmission) Admit(a admission.Attributes) (err error) {
// ignore all operations that correspond to sub-resource actions
if a.GetSubresource() != "" {
return nil
}
// if we do not know how to evaluate use for this kind, just ignore
evaluators := q.registry.Evaluators()
evaluator, found := evaluators[a.GetKind()]
if !found {
return nil
}
// for this kind, check if the operation could mutate any quota resources
// if no resources tracked by quota are impacted, then just return
op := a.GetOperation()
operationResources := evaluator.OperationResources(op)
if len(operationResources) == 0 {
return nil
}
// determine if there are any quotas in this namespace
// if there are no quotas, we don't need to do anything
namespace, name := a.GetNamespace(), a.GetName()
items, err := q.indexer.Index("namespace", &api.ResourceQuota{ObjectMeta: api.ObjectMeta{Namespace: namespace, Name: ""}})
if err != nil {
return admission.NewForbidden(a, fmt.Errorf("Error resolving quota."))
}
// 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 := q.liveLookupCache.Get(a.GetNamespace())
if !ok || lruItemObj.(liveLookupEntry).expiry.Before(time.Now()) {
// TODO: If there are multiple operations at the same time and cache has just expired,
// this may cause multiple List operations being issued at the same time.
// If there is already in-flight List() for a given namespace, we should wait until
// it is finished and cache is updated instead of doing the same, also to avoid
// throttling - see #22422 for details.
liveList, err := q.client.Core().ResourceQuotas(namespace).List(api.ListOptions{})
if err != nil {
return admission.NewForbidden(a, err)
}
newEntry := liveLookupEntry{expiry: time.Now().Add(q.liveTTL)}
for i := range liveList.Items {
newEntry.items = append(newEntry.items, &liveList.Items[i])
}
q.liveLookupCache.Add(a.GetNamespace(), newEntry)
lruItemObj = newEntry
}
lruEntry := lruItemObj.(liveLookupEntry)
for i := range lruEntry.items {
items = append(items, lruEntry.items[i])
}
}
// if there are still no items, we can return
if len(items) == 0 {
return nil
}
// find the set of quotas that are pertinent to this request
// reject if we match the quota, but usage is not calculated yet
// reject if the input object does not satisfy quota constraints
// if there are no pertinent quotas, we can just return
inputObject := a.GetObject()
resourceQuotas := []*api.ResourceQuota{}
for i := range items {
resourceQuota := items[i].(*api.ResourceQuota)
match := evaluator.Matches(resourceQuota, inputObject)
if !match {
continue
}
hardResources := quota.ResourceNames(resourceQuota.Status.Hard)
evaluatorResources := evaluator.MatchesResources()
requiredResources := quota.Intersection(hardResources, evaluatorResources)
err := evaluator.Constraints(requiredResources, inputObject)
if err != nil {
return admission.NewForbidden(a, fmt.Errorf("Failed quota: %s: %v", resourceQuota.Name, err))
}
if !hasUsageStats(resourceQuota) {
return admission.NewForbidden(a, fmt.Errorf("Status unknown for quota: %s", resourceQuota.Name))
}
resourceQuotas = append(resourceQuotas, resourceQuota)
}
if len(resourceQuotas) == 0 {
return nil
}
// there is at least one quota that definitely matches our object
// as a result, we need to measure the usage of this object for quota
// on updates, we need to subtract the previous measured usage
// if usage shows no change, just return since it has no impact on quota
deltaUsage := evaluator.Usage(inputObject)
if admission.Update == op {
prevItem, err := evaluator.Get(namespace, name)
if err != nil {
return admission.NewForbidden(a, fmt.Errorf("Unable to get previous: %v", err))
}
prevUsage := evaluator.Usage(prevItem)
deltaUsage = quota.Subtract(deltaUsage, prevUsage)
}
if quota.IsZero(deltaUsage) {
return nil
}
// TODO: Move to a bucketing work queue
// If we guaranteed that we processed the request in order it was received to server, we would reduce quota conflicts.
// Until we have the bucketing work queue, we jitter requests and retry on conflict.
numRetries := 10
interval := time.Duration(rand.Int63n(90)+int64(10)) * time.Millisecond
// seed the retry loop with the initial set of quotas to process (should reduce each iteration)
resourceQuotasToProcess := resourceQuotas
for retry := 1; retry <= numRetries; retry++ {
// the list of quotas we will try again if there is a version conflict
tryAgain := []*api.ResourceQuota{}
// check that we pass all remaining quotas so we do not prematurely charge
// for each quota, mask the usage to the set of resources tracked by the quota
// if request + used > hard, return an error describing the failure
updatedUsage := map[string]api.ResourceList{}
for _, resourceQuota := range resourceQuotasToProcess {
hardResources := quota.ResourceNames(resourceQuota.Status.Hard)
requestedUsage := quota.Mask(deltaUsage, hardResources)
newUsage := quota.Add(resourceQuota.Status.Used, requestedUsage)
if allowed, exceeded := quota.LessThanOrEqual(newUsage, resourceQuota.Status.Hard); !allowed {
failedRequestedUsage := quota.Mask(requestedUsage, exceeded)
failedUsed := quota.Mask(resourceQuota.Status.Used, exceeded)
failedHard := quota.Mask(resourceQuota.Status.Hard, exceeded)
return admission.NewForbidden(a,
fmt.Errorf("Exceeded quota: %s, requested: %s, used: %s, limited: %s",
resourceQuota.Name,
prettyPrint(failedRequestedUsage),
prettyPrint(failedUsed),
prettyPrint(failedHard)))
}
updatedUsage[resourceQuota.Name] = newUsage
}
// update the status for each quota with its new usage
// if we get a conflict, get updated quota, and enqueue
for i, resourceQuota := range resourceQuotasToProcess {
newUsage := updatedUsage[resourceQuota.Name]
quotaToUpdate := &api.ResourceQuota{
ObjectMeta: api.ObjectMeta{
Name: resourceQuota.Name,
Namespace: resourceQuota.Namespace,
ResourceVersion: resourceQuota.ResourceVersion,
},
Status: api.ResourceQuotaStatus{
Hard: quota.Add(api.ResourceList{}, resourceQuota.Status.Hard),
Used: newUsage,
},
}
_, err = q.client.Core().ResourceQuotas(quotaToUpdate.Namespace).UpdateStatus(quotaToUpdate)
if err != nil {
if !errors.IsConflict(err) {
return admission.NewForbidden(a, fmt.Errorf("Unable to update quota status: %s %v", resourceQuota.Name, err))
}
// if we get a conflict, we get the latest copy of the quota documents that were not yet modified so we retry all with latest state.
for fetchIndex := i; fetchIndex < len(resourceQuotasToProcess); fetchIndex++ {
latestQuota, err := q.client.Core().ResourceQuotas(namespace).Get(resourceQuotasToProcess[fetchIndex].Name)
if err != nil {
return admission.NewForbidden(a, fmt.Errorf("Unable to get quota: %s %v", resourceQuotasToProcess[fetchIndex].Name, err))
}
tryAgain = append(tryAgain, latestQuota)
}
break
}
}
// all quotas were updated, so we can return
if len(tryAgain) == 0 {
return nil
}
// we have concurrent requests to update quota, so look to retry if needed
// next iteration, we need to process the items that have to try again
// pause the specified interval to encourage jitter
if retry == numRetries {
names := []string{}
for _, quota := range tryAgain {
names = append(names, quota.Name)
}
return admission.NewForbidden(a, fmt.Errorf("Unable to update status for quota: %s, ", strings.Join(names, ",")))
}
resourceQuotasToProcess = tryAgain
time.Sleep(interval)
}
return nil
}
