// NewServiceAccount returns an admission.Interface implementation which limits admission of Pod CREATE requests based on the pod's ServiceAccount:
// 1. If the pod does not specify a ServiceAccount, it sets the pod's ServiceAccount to "default"
// 2. It ensures the ServiceAccount referenced by the pod exists
// 3. If LimitSecretReferences is true, it rejects the pod if the pod references Secret objects which the pod's ServiceAccount does not reference
// 4. If the pod does not contain any ImagePullSecrets, the ImagePullSecrets of the service account are added.
// 5. If MountServiceAccountToken is true, it adds a VolumeMount with the pod's ServiceAccount's api token secret to containers
func NewServiceAccount(cl clientset.Interface) *serviceAccount {
serviceAccountsIndexer, serviceAccountsReflector := cache.NewNamespaceKeyedIndexerAndReflector(
&cache.ListWatch{
ListFunc: func(options v1.ListOptions) (runtime.Object, error) {
internalOptions := api.ListOptions{}
v1.Convert_v1_ListOptions_To_api_ListOptions(&options, &internalOptions, nil)
return cl.Core().ServiceAccounts(api.NamespaceAll).List(internalOptions)
},
WatchFunc: func(options v1.ListOptions) (watch.Interface, error) {
internalOptions := api.ListOptions{}
v1.Convert_v1_ListOptions_To_api_ListOptions(&options, &internalOptions, nil)
return cl.Core().ServiceAccounts(api.NamespaceAll).Watch(internalOptions)
},
},
&api.ServiceAccount{},
0,
)
tokenSelector := fields.SelectorFromSet(map[string]string{api.SecretTypeField: string(api.SecretTypeServiceAccountToken)})
secretsIndexer, secretsReflector := cache.NewNamespaceKeyedIndexerAndReflector(
&cache.ListWatch{
ListFunc: func(options v1.ListOptions) (runtime.Object, error) {
internalOptions := api.ListOptions{}
v1.Convert_v1_ListOptions_To_api_ListOptions(&options, &internalOptions, nil)
internalOptions.FieldSelector = tokenSelector
return cl.Core().Secrets(api.NamespaceAll).List(internalOptions)
},
WatchFunc: func(options v1.ListOptions) (watch.Interface, error) {
internalOptions := api.ListOptions{}
v1.Convert_v1_ListOptions_To_api_ListOptions(&options, &internalOptions, nil)
internalOptions.FieldSelector = tokenSelector
return cl.Core().Secrets(api.NamespaceAll).Watch(internalOptions)
},
},
&api.Secret{},
0,
)
return &serviceAccount{
Handler: admission.NewHandler(admission.Create),
// TODO: enable this once we've swept secret usage to account for adding secret references to service accounts
LimitSecretReferences: false,
// Auto mount service account API token secrets
MountServiceAccountToken: true,
// Reject pod creation until a service account token is available
RequireAPIToken: true,
client: cl,
serviceAccounts: serviceAccountsIndexer,
serviceAccountsReflector: serviceAccountsReflector,
secrets: secretsIndexer,
secretsReflector: secretsReflector,
}
}
// NewLimitRanger returns an object that enforces limits based on the supplied limit function
func NewLimitRanger(client clientset.Interface, actions LimitRangerActions) (admission.Interface, error) {
liveLookupCache, err := lru.New(10000)
if err != nil {
return nil, err
}
lw := &cache.ListWatch{
ListFunc: func(options api.ListOptions) (runtime.Object, error) {
return client.Core().LimitRanges(api.NamespaceAll).List(options)
},
WatchFunc: func(options api.ListOptions) (watch.Interface, error) {
return client.Core().LimitRanges(api.NamespaceAll).Watch(options)
},
}
indexer, reflector := cache.NewNamespaceKeyedIndexerAndReflector(lw, &api.LimitRange{}, 0)
reflector.Run()
if actions == nil {
actions = &DefaultLimitRangerActions{}
}
return &limitRanger{
Handler: admission.NewHandler(admission.Create, admission.Update),
client: client,
actions: actions,
indexer: indexer,
liveLookupCache: liveLookupCache,
liveTTL: time.Duration(30 * time.Second),
}, nil
}
// newQuotaAccessor creates an object that conforms to the QuotaAccessor interface to be used to retrieve quota objects.
func newQuotaAccessor(client clientset.Interface) (*quotaAccessor, error) {
liveLookupCache, err := lru.New(100)
if err != nil {
return nil, err
}
updatedCache, err := lru.New(100)
if err != nil {
return nil, err
}
lw := &cache.ListWatch{
ListFunc: func(options v1.ListOptions) (runtime.Object, error) {
internalOptions := api.ListOptions{}
v1.Convert_v1_ListOptions_To_api_ListOptions(&options, &internalOptions, nil)
return client.Core().ResourceQuotas(api.NamespaceAll).List(internalOptions)
},
WatchFunc: func(options v1.ListOptions) (watch.Interface, error) {
internalOptions := api.ListOptions{}
v1.Convert_v1_ListOptions_To_api_ListOptions(&options, &internalOptions, nil)
return client.Core().ResourceQuotas(api.NamespaceAll).Watch(internalOptions)
},
}
indexer, reflector := cache.NewNamespaceKeyedIndexerAndReflector(lw, &api.ResourceQuota{}, 0)
return "aAccessor{
client: client,
indexer: indexer,
reflector: reflector,
liveLookupCache: liveLookupCache,
liveTTL: time.Duration(30 * time.Second),
updatedQuotas: updatedCache,
}, nil
}
// newQuotaEvaluator configures an admission controller that can enforce quota constraints
// using the provided registry. The registry must have the capability to handle group/kinds that
// are persisted by the server this admission controller is intercepting
func newQuotaEvaluator(client clientset.Interface, registry quota.Registry) (*quotaEvaluator, error) {
liveLookupCache, err := lru.New(100)
if err != nil {
return nil, err
}
updatedCache, err := lru.New(100)
if err != nil {
return nil, err
}
lw := &cache.ListWatch{
ListFunc: func(options api.ListOptions) (runtime.Object, error) {
return client.Core().ResourceQuotas(api.NamespaceAll).List(options)
},
WatchFunc: func(options api.ListOptions) (watch.Interface, error) {
return client.Core().ResourceQuotas(api.NamespaceAll).Watch(options)
},
}
indexer, reflector := cache.NewNamespaceKeyedIndexerAndReflector(lw, &api.ResourceQuota{}, 0)
reflector.Run()
return "aEvaluator{
client: client,
indexer: indexer,
registry: registry,
liveLookupCache: liveLookupCache,
liveTTL: time.Duration(30 * time.Second),
updatedQuotas: updatedCache,
queue: workqueue.New(),
work: map[string][]*admissionWaiter{},
dirtyWork: map[string][]*admissionWaiter{},
inProgress: sets.String{},
}, nil
}
// NewServiceAccount returns an admission.Interface implementation which limits admission of Pod CREATE requests based on the pod's ServiceAccount:
// 1. If the pod does not specify a ServiceAccount, it sets the pod's ServiceAccount to "default"
// 2. It ensures the ServiceAccount referenced by the pod exists
// 3. If LimitSecretReferences is true, it rejects the pod if the pod references Secret objects which the pod's ServiceAccount does not reference
// 4. If the pod does not contain any ImagePullSecrets, the ImagePullSecrets of the service account are added.
// 5. If MountServiceAccountToken is true, it adds a VolumeMount with the pod's ServiceAccount's api token secret to containers
func NewServiceAccount(cl client.Interface) *serviceAccount {
serviceAccountsIndexer, serviceAccountsReflector := cache.NewNamespaceKeyedIndexerAndReflector(
&cache.ListWatch{
ListFunc: func() (runtime.Object, error) {
return cl.ServiceAccounts(api.NamespaceAll).List(labels.Everything(), fields.Everything())
},
WatchFunc: func(resourceVersion string) (watch.Interface, error) {
options := api.ListOptions{ResourceVersion: resourceVersion}
return cl.ServiceAccounts(api.NamespaceAll).Watch(labels.Everything(), fields.Everything(), options)
},
},
&api.ServiceAccount{},
0,
)
tokenSelector := fields.SelectorFromSet(map[string]string{client.SecretType: string(api.SecretTypeServiceAccountToken)})
secretsIndexer, secretsReflector := cache.NewNamespaceKeyedIndexerAndReflector(
&cache.ListWatch{
ListFunc: func() (runtime.Object, error) {
return cl.Secrets(api.NamespaceAll).List(labels.Everything(), tokenSelector)
},
WatchFunc: func(resourceVersion string) (watch.Interface, error) {
options := api.ListOptions{ResourceVersion: resourceVersion}
return cl.Secrets(api.NamespaceAll).Watch(labels.Everything(), tokenSelector, options)
},
},
&api.Secret{},
0,
)
return &serviceAccount{
Handler: admission.NewHandler(admission.Create),
// TODO: enable this once we've swept secret usage to account for adding secret references to service accounts
LimitSecretReferences: false,
// Auto mount service account API token secrets
MountServiceAccountToken: true,
// Reject pod creation until a service account token is available
RequireAPIToken: true,
client: cl,
serviceAccounts: serviceAccountsIndexer,
serviceAccountsReflector: serviceAccountsReflector,
secrets: secretsIndexer,
secretsReflector: secretsReflector,
}
}
func (a *serviceAccount) SetInternalClientSet(cl internalclientset.Interface) {
a.client = cl
a.serviceAccounts, a.serviceAccountsReflector = cache.NewNamespaceKeyedIndexerAndReflector(
&cache.ListWatch{
ListFunc: func(options v1.ListOptions) (runtime.Object, error) {
internalOptions := api.ListOptions{}
v1.Convert_v1_ListOptions_To_api_ListOptions(&options, &internalOptions, nil)
return cl.Core().ServiceAccounts(api.NamespaceAll).List(internalOptions)
},
WatchFunc: func(options v1.ListOptions) (watch.Interface, error) {
internalOptions := api.ListOptions{}
v1.Convert_v1_ListOptions_To_api_ListOptions(&options, &internalOptions, nil)
return cl.Core().ServiceAccounts(api.NamespaceAll).Watch(internalOptions)
},
},
&api.ServiceAccount{},
0,
)
tokenSelector := fields.SelectorFromSet(map[string]string{api.SecretTypeField: string(api.SecretTypeServiceAccountToken)})
a.secrets, a.secretsReflector = cache.NewNamespaceKeyedIndexerAndReflector(
&cache.ListWatch{
ListFunc: func(options v1.ListOptions) (runtime.Object, error) {
internalOptions := api.ListOptions{}
v1.Convert_v1_ListOptions_To_api_ListOptions(&options, &internalOptions, nil)
internalOptions.FieldSelector = tokenSelector
return cl.Core().Secrets(api.NamespaceAll).List(internalOptions)
},
WatchFunc: func(options v1.ListOptions) (watch.Interface, error) {
internalOptions := api.ListOptions{}
v1.Convert_v1_ListOptions_To_api_ListOptions(&options, &internalOptions, nil)
internalOptions.FieldSelector = tokenSelector
return cl.Core().Secrets(api.NamespaceAll).Watch(internalOptions)
},
},
&api.Secret{},
0,
)
if cl != nil {
a.Run()
}
}
// NewResourceQuota creates a new resource quota admission control handler
func NewResourceQuota(client client.Interface) admission.Interface {
lw := &cache.ListWatch{
ListFunc: func() (runtime.Object, error) {
return client.ResourceQuotas(api.NamespaceAll).List(labels.Everything(), fields.Everything())
},
WatchFunc: func(resourceVersion string) (watch.Interface, error) {
return client.ResourceQuotas(api.NamespaceAll).Watch(labels.Everything(), fields.Everything(), resourceVersion)
},
}
indexer, reflector := cache.NewNamespaceKeyedIndexerAndReflector(lw, &api.ResourceQuota{}, 0)
reflector.Run()
return createResourceQuota(client, indexer)
}
// NewResourceQuota creates a new resource quota admission control handler
func NewResourceQuota(client clientset.Interface) admission.Interface {
lw := &cache.ListWatch{
ListFunc: func(options api.ListOptions) (runtime.Object, error) {
return client.Core().ResourceQuotas(api.NamespaceAll).List(options)
},
WatchFunc: func(options api.ListOptions) (watch.Interface, error) {
return client.Core().ResourceQuotas(api.NamespaceAll).Watch(options)
},
}
indexer, reflector := cache.NewNamespaceKeyedIndexerAndReflector(lw, &api.ResourceQuota{}, 0)
reflector.Run()
return createResourceQuota(client, indexer)
}
func NewLimitVerifier(client kclient.LimitRangesNamespacer) LimitVerifier {
lw := &cache.ListWatch{
ListFunc: func(options kapi.ListOptions) (runtime.Object, error) {
return client.LimitRanges(kapi.NamespaceAll).List(options)
},
WatchFunc: func(options kapi.ListOptions) (watch.Interface, error) {
return client.LimitRanges(kapi.NamespaceAll).Watch(options)
},
}
indexer, reflector := cache.NewNamespaceKeyedIndexerAndReflector(lw, &kapi.LimitRange{}, 0)
reflector.Run()
return &limitVerifier{
client: client,
indexer: indexer,
}
}
// NewLimitRanger returns an object that enforces limits based on the supplied limit function
func NewLimitRanger(client client.Interface, limitFunc LimitFunc) admission.Interface {
lw := &cache.ListWatch{
ListFunc: func() (runtime.Object, error) {
return client.LimitRanges(api.NamespaceAll).List(labels.Everything())
},
WatchFunc: func(resourceVersion string) (watch.Interface, error) {
return client.LimitRanges(api.NamespaceAll).Watch(labels.Everything(), fields.Everything(), resourceVersion)
},
}
indexer, reflector := cache.NewNamespaceKeyedIndexerAndReflector(lw, &api.LimitRange{}, 0)
reflector.Run()
return &limitRanger{
Handler: admission.NewHandler(admission.Create, admission.Update),
client: client,
limitFunc: limitFunc,
indexer: indexer,
}
}
// NewLimitRanger returns an object that enforces limits based on the supplied limit function
func NewLimitRanger(client client.Interface, limitFunc LimitFunc) admission.Interface {
lw := &cache.ListWatch{
ListFunc: func(options unversioned.ListOptions) (runtime.Object, error) {
return client.LimitRanges(api.NamespaceAll).List(options)
},
WatchFunc: func(options unversioned.ListOptions) (watch.Interface, error) {
return client.LimitRanges(api.NamespaceAll).Watch(options)
},
}
indexer, reflector := cache.NewNamespaceKeyedIndexerAndReflector(lw, &api.LimitRange{}, 0)
reflector.Run()
return &limitRanger{
Handler: admission.NewHandler(admission.Create, admission.Update),
client: client,
limitFunc: limitFunc,
indexer: indexer,
}
}
// NewResourceQuota configures an admission controller that can enforce quota constraints
// using the provided registry. The registry must have the capability to handle group/kinds that
// are persisted by the server this admission controller is intercepting
func NewResourceQuota(client clientset.Interface, registry quota.Registry) (admission.Interface, error) {
liveLookupCache, err := lru.New(100)
if err != nil {
return nil, err
}
lw := &cache.ListWatch{
ListFunc: func(options api.ListOptions) (runtime.Object, error) {
return client.Core().ResourceQuotas(api.NamespaceAll).List(options)
},
WatchFunc: func(options api.ListOptions) (watch.Interface, error) {
return client.Core().ResourceQuotas(api.NamespaceAll).Watch(options)
},
}
indexer, reflector := cache.NewNamespaceKeyedIndexerAndReflector(lw, &api.ResourceQuota{}, 0)
reflector.Run()
return "aAdmission{
Handler: admission.NewHandler(admission.Create, admission.Update),
client: client,
indexer: indexer,
registry: registry,
liveLookupCache: liveLookupCache,
liveTTL: time.Duration(30 * time.Second),
}, nil
}