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
}
// GetPod returns a pod from an admission attributes object
func GetPod(a admission.Attributes) (*kapi.Pod, error) {
pod, isPod := a.GetObject().(*kapi.Pod)
if !isPod {
return nil, admission.NewForbidden(a, fmt.Errorf("unrecognized request object: %#v", a.GetObject()))
}
return pod, nil
}
// Admit determines if the endpoints object should be admitted
func (r *restrictedEndpointsAdmission) Admit(a kadmission.Attributes) error {
if a.GetResource().GroupResource() != kapi.Resource("endpoints") {
return nil
}
ep, ok := a.GetObject().(*kapi.Endpoints)
if !ok {
return nil
}
old, ok := a.GetOldObject().(*kapi.Endpoints)
if ok && reflect.DeepEqual(ep.Subsets, old.Subsets) {
return nil
}
restrictedIP := r.findRestrictedIP(ep)
if restrictedIP == "" {
return nil
}
allow, err := r.checkAccess(a)
if err != nil {
return err
}
if !allow {
return kadmission.NewForbidden(a, fmt.Errorf("endpoint address %s is not allowed", restrictedIP))
}
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))
}
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
}
func (a *buildByStrategy) checkBuildRequestAuthorization(req *buildapi.BuildRequest, attr admission.Attributes) error {
switch attr.GetResource().GroupResource() {
case buildsResource:
build, err := a.client.Builds(attr.GetNamespace()).Get(req.Name)
if err != nil {
return admission.NewForbidden(attr, err)
}
return a.checkBuildAuthorization(build, attr)
case buildConfigsResource:
build, err := a.client.BuildConfigs(attr.GetNamespace()).Get(req.Name)
if err != nil {
return admission.NewForbidden(attr, err)
}
return a.checkBuildConfigAuthorization(build, attr)
default:
return admission.NewForbidden(attr, fmt.Errorf("Unknown resource type %s for BuildRequest", attr.GetResource()))
}
}
// Admit makes admission decisions while enforcing ownerReference
func (q *ownerReferenceAdmission) Admit(a admission.Attributes) (err error) {
metadata, err := meta.Accessor(a.GetObject())
if err != nil {
// if we don't have object meta, we don't have fields we're trying to control
return nil
}
// TODO if we have an old object, only consider new owner references and finalizers
// this is critical when doing an actual authz check.
if ownerRefs := metadata.GetOwnerReferences(); len(ownerRefs) > 0 {
return admission.NewForbidden(a, fmt.Errorf("ownerReferences are disabled: %v", ownerRefs))
}
if finalizers := metadata.GetFinalizers(); len(finalizers) > 0 {
return admission.NewForbidden(a, fmt.Errorf("finalizers are disabled: %v", finalizers))
}
return nil
}
func (a *buildByStrategy) checkAccess(strategy buildapi.BuildStrategy, subjectAccessReview *authorizationapi.LocalSubjectAccessReview, attr admission.Attributes) error {
resp, err := a.client.LocalSubjectAccessReviews(attr.GetNamespace()).Create(subjectAccessReview)
if err != nil {
return admission.NewForbidden(attr, err)
}
if !resp.Allowed {
return notAllowed(strategy, attr)
}
return nil
}
func (l *persistentVolumeLabel) Admit(a admission.Attributes) (err error) {
if a.GetResource() != api.Resource("persistentvolumes") {
return nil
}
obj := a.GetObject()
if obj == nil {
return nil
}
volume, ok := obj.(*api.PersistentVolume)
if !ok {
return nil
}
var volumeLabels map[string]string
if volume.Spec.AWSElasticBlockStore != nil {
labels, err := l.findAWSEBSLabels(volume)
if err != nil {
return admission.NewForbidden(a, fmt.Errorf("error querying AWS EBS volume %s: %v", volume.Spec.AWSElasticBlockStore.VolumeID, err))
}
volumeLabels = labels
}
if volume.Spec.GCEPersistentDisk != nil {
labels, err := l.findGCEPDLabels(volume)
if err != nil {
return admission.NewForbidden(a, fmt.Errorf("error querying GCE PD volume %s: %v", volume.Spec.GCEPersistentDisk.PDName, err))
}
volumeLabels = labels
}
if len(volumeLabels) != 0 {
if volume.Labels == nil {
volume.Labels = make(map[string]string)
}
for k, v := range volumeLabels {
// We (silently) replace labels if they are provided.
// This should be OK because they are in the kubernetes.io namespace
// i.e. we own them
volume.Labels[k] = v
}
}
return nil
}
// GetBuild returns a build object encoded in a pod's BUILD environment variable along with
// its encoding version
func GetBuild(a admission.Attributes) (*buildapi.Build, unversioned.GroupVersion, error) {
pod, err := GetPod(a)
if err != nil {
return nil, unversioned.GroupVersion{}, err
}
build, version, err := getBuildFromPod(pod)
if err != nil {
return nil, unversioned.GroupVersion{}, admission.NewForbidden(a, fmt.Errorf("unable to get build from pod: %v", err))
}
return build, version, nil
}
// SetBuild encodes a build object and sets it in a pod's BUILD environment variable
func SetBuild(a admission.Attributes, build *buildapi.Build, groupVersion unversioned.GroupVersion) error {
pod, err := GetPod(a)
if err != nil {
return err
}
err = setBuildInPod(build, pod, groupVersion)
if err != nil {
return admission.NewForbidden(a, fmt.Errorf("unable to set build in pod: %v", 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
}
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 (l *lifecycle) Admit(a admission.Attributes) (err error) {
// prevent deletion of immortal namespaces
if a.GetOperation() == admission.Delete && a.GetKind() == api.Kind("Namespace") && l.immortalNamespaces.Has(a.GetName()) {
return errors.NewForbidden(a.GetKind().Kind, a.GetName(), fmt.Errorf("this namespace may not be deleted"))
}
gvk, err := api.RESTMapper.KindFor(a.GetResource().Resource)
if err != nil {
return errors.NewInternalError(err)
}
mapping, err := api.RESTMapper.RESTMapping(gvk.GroupKind(), gvk.Version)
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
}
// Function to call on webhook failure; behavior determined by defaultAllow flag
func (a *imagePolicyWebhook) webhookError(attributes admission.Attributes, err error) error {
if err != nil {
glog.V(2).Infof("error contacting webhook backend: %s")
if a.defaultAllow {
glog.V(2).Infof("resource allowed in spite of webhook backend failure")
return nil
}
glog.V(2).Infof("resource not allowed due to webhook backend failure ")
return admission.NewForbidden(attributes, err)
}
return nil
}
func (l *lifecycle) Admit(a admission.Attributes) (err error) {
// prevent deletion of immortal namespaces
if a.GetOperation() == admission.Delete {
if a.GetKind() == "Namespace" && l.immortalNamespaces.Has(a.GetName()) {
return errors.NewForbidden(a.GetKind(), a.GetName(), fmt.Errorf("namespace can never be deleted"))
}
return nil
}
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)
}
if !exists {
return nil
}
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()))
}
// 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().GroupResource() != 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)
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: %#v", api.PluginName, pod.Spec)
for i := range pod.Spec.InitContainers {
updateContainerResources(a.config, &pod.Spec.InitContainers[i])
}
for i := range pod.Spec.Containers {
updateContainerResources(a.config, &pod.Spec.Containers[i])
}
glog.V(5).Infof("%s: pod limits after overrides are: %#v", api.PluginName, pod.Spec)
return nil
}
