Documentation

Index

Constants

This section is empty.

Variables

var (
	// PluginEnabledFn checks whether a plugin is enabled.  By default, if you ask about it, it's enabled.
	PluginEnabledFn = func(name string, config io.Reader) bool {
		return true
	}
)

All registered admission options.


Functions

func GetAdmissionPluginConfigurationFor

func GetAdmissionPluginConfigurationFor(pluginCfg apiserver.AdmissionPluginConfiguration) (io.Reader, error)

GetAdmissionPluginConfigurationFor returns a reader that holds the admission plugin configuration.

func NewChainHandler

func NewChainHandler(handlers ...Interface) chainAdmissionHandler

NewChainHandler creates a new chain handler from an array of handlers. Used for testing.

func NewForbidden

func NewForbidden(a Attributes, internalError error) error

NewForbidden is a utility function to return a well-formatted admission control error response

func NewNotFound

func NewNotFound(a Attributes) error

NewNotFound is a utility function to return a well-formatted admission control error response

func ValidateInitialization

func ValidateInitialization(plugin Interface) error

ValidateInitialization will call the InitializationValidate function in each plugin if they implement the InitializationValidator interface.

Types

type AnnotationsGetter

type AnnotationsGetter interface {
	GetAnnotations(maxLevel auditinternal.Level) map[string]string
}

AnnotationsGetter allows users to get annotations from Attributes. An alternate Attribute should implement this interface.

type Attributes

type Attributes interface {
	// GetName returns the name of the object as presented in the request.  On a CREATE operation, the client
	// may omit name and rely on the server to generate the name.  If that is the case, this method will return
	// the empty string
	GetName() string
	// GetNamespace is the namespace associated with the request (if any)
	GetNamespace() string
	// GetResource is the name of the resource being requested.  This is not the kind.  For example: pods
	GetResource() schema.GroupVersionResource
	// GetSubresource is the name of the subresource being requested.  This is a different resource, scoped to the parent resource, but it may have a different kind.
	// For instance, /pods has the resource "pods" and the kind "Pod", while /pods/foo/status has the resource "pods", the sub resource "status", and the kind "Pod"
	// (because status operates on pods). The binding resource for a pod though may be /pods/foo/binding, which has resource "pods", subresource "binding", and kind "Binding".
	GetSubresource() string
	// GetOperation is the operation being performed
	GetOperation() Operation
	// GetOperationOptions is the options for the operation being performed
	GetOperationOptions() runtime.Object
	// IsDryRun indicates that modifications will definitely not be persisted for this request. This is to prevent
	// admission controllers with side effects and a method of reconciliation from being overwhelmed.
	// However, a value of false for this does not mean that the modification will be persisted, because it
	// could still be rejected by a subsequent validation step.
	IsDryRun() bool
	// GetObject is the object from the incoming request prior to default values being applied
	GetObject() runtime.Object
	// GetOldObject is the existing object. Only populated for UPDATE requests.
	GetOldObject() runtime.Object
	// GetKind is the type of object being manipulated.  For example: Pod
	GetKind() schema.GroupVersionKind
	// GetUserInfo is information about the requesting user
	GetUserInfo() user.Info

	// AddAnnotation sets annotation according to key-value pair. The key should be qualified, e.g., podsecuritypolicy.admission.k8s.io/admit-policy, where
	// "podsecuritypolicy" is the name of the plugin, "admission.k8s.io" is the name of the organization, "admit-policy" is the key name.
	// An error is returned if the format of key is invalid. When trying to overwrite annotation with a new value, an error is returned.
	// Both ValidationInterface and MutationInterface are allowed to add Annotations.
	// By default, an annotation gets logged into audit event if the request's audit level is greater or
	// equal to Metadata.
	AddAnnotation(key, value string) error

	// AddAnnotationWithLevel sets annotation according to key-value pair with additional intended audit level.
	// An Annotation gets logged into audit event if the request's audit level is greater or equal to the
	// intended audit level.
	AddAnnotationWithLevel(key, value string, level auditinternal.Level) error

	// GetReinvocationContext tracks the admission request information relevant to the re-invocation policy.
	GetReinvocationContext() ReinvocationContext
}

Attributes is an interface used by AdmissionController to get information about a request that is used to make an admission decision.

func NewAttributesRecord

func NewAttributesRecord(object runtime.Object, oldObject runtime.Object, kind schema.GroupVersionKind, namespace, name string, resource schema.GroupVersionResource, subresource string, operation Operation, operationOptions runtime.Object, dryRun bool, userInfo user.Info) Attributes

type ConfigProvider

type ConfigProvider interface {
	ConfigFor(pluginName string) (io.Reader, error)
}

ConfigProvider provides a way to get configuration for an admission plugin based on its name

func ReadAdmissionConfiguration

func ReadAdmissionConfiguration(pluginNames []string, configFilePath string, configScheme *runtime.Scheme) (ConfigProvider, error)

ReadAdmissionConfiguration reads the admission configuration at the specified path. It returns the loaded admission configuration if the input file aligns with the required syntax. If it does not align with the provided syntax, it returns a default configuration for the enumerated set of pluginNames whose config location references the specified configFilePath. It does this to preserve backward compatibility when admission control files were opaque. It returns an error if the file did not exist.

type Decorator

type Decorator interface {
	Decorate(handler Interface, name string) Interface
}

type DecoratorFunc

type DecoratorFunc func(handler Interface, name string) Interface

func (DecoratorFunc) Decorate

func (d DecoratorFunc) Decorate(handler Interface, name string) Interface

type Decorators

type Decorators []Decorator

func (Decorators) Decorate

func (d Decorators) Decorate(handler Interface, name string) Interface

Decorate applies the decorator in inside-out order, i.e. the first decorator in the slice is first applied to the given handler.

type Factory

type Factory func(config io.Reader) (Interface, error)

Factory is a function that returns an Interface for admission decisions. The config parameter provides an io.Reader handler to the factory in order to load specific configurations. If no configuration is provided the parameter is nil.

type Handler

type Handler struct {
	// contains filtered or unexported fields
}

Handler is a base for admission control handlers that support a predefined set of operations

func NewHandler

func NewHandler(ops ...Operation) *Handler

NewHandler creates a new base handler that handles the passed in operations

func (*Handler) Handles

func (h *Handler) Handles(operation Operation) bool

Handles returns true for methods that this handler supports

func (*Handler) SetReadyFunc

func (h *Handler) SetReadyFunc(readyFunc ReadyFunc)

SetReadyFunc allows late registration of a ReadyFunc to know if the handler is ready to process requests.

func (*Handler) WaitForReady

func (h *Handler) WaitForReady() bool

WaitForReady will wait for the readyFunc (if registered) to return ready, and in case of timeout, will return false.

type InitializationValidator

type InitializationValidator interface {
	ValidateInitialization() error
}

InitializationValidator holds ValidateInitialization functions, which are responsible for validation of initialized shared resources and should be implemented on admission plugins

type Interface

type Interface interface {
	// Handles returns true if this admission controller can handle the given operation
	// where operation can be one of CREATE, UPDATE, DELETE, or CONNECT
	Handles(operation Operation) bool
}

Interface is an abstract, pluggable interface for Admission Control decisions.

func WithAudit

func WithAudit(i Interface, ae *auditinternal.Event) Interface

WithAudit is a decorator for a admission phase. It saves annotations of attribute into the audit event. Attributes passed to the Admit and Validate function must be instance of privateAnnotationsGetter or AnnotationsGetter, otherwise an error is returned.

type MutationInterface

type MutationInterface interface {
	Interface

	// Admit makes an admission decision based on the request attributes.
	// Context is used only for timeout/deadline/cancellation and tracing information.
	Admit(ctx context.Context, a Attributes, o ObjectInterfaces) (err error)
}

type ObjectInterfaces

type ObjectInterfaces interface {
	// GetObjectCreater is the ObjectCreator appropriate for the requested object.
	GetObjectCreater() runtime.ObjectCreater
	// GetObjectTyper is the ObjectTyper appropriate for the requested object.
	GetObjectTyper() runtime.ObjectTyper
	// GetObjectDefaulter is the ObjectDefaulter appropriate for the requested object.
	GetObjectDefaulter() runtime.ObjectDefaulter
	// GetObjectConvertor is the ObjectConvertor appropriate for the requested object.
	GetObjectConvertor() runtime.ObjectConvertor
	// GetEquivalentResourceMapper is the EquivalentResourceMapper appropriate for finding equivalent resources and expected kind for the requested object.
	GetEquivalentResourceMapper() runtime.EquivalentResourceMapper
}

ObjectInterfaces is an interface used by AdmissionController to get object interfaces such as Converter or Defaulter. These interfaces are normally coming from Request Scope to handle special cases like CRDs.

func NewObjectInterfacesFromScheme

func NewObjectInterfacesFromScheme(scheme *runtime.Scheme) ObjectInterfaces

type Operation

type Operation string

Operation is the type of resource operation being checked for admission control

const (
	Create  Operation = "CREATE"
	Update  Operation = "UPDATE"
	Delete  Operation = "DELETE"
	Connect Operation = "CONNECT"
)

Operation constants

type PluginEnabledFunc

type PluginEnabledFunc func(name string, config io.Reader) bool

PluginEnabledFunc is a function type that can provide an external check on whether an admission plugin may be enabled

type PluginInitializer

type PluginInitializer interface {
	Initialize(plugin Interface)
}

PluginInitializer is used for initialization of shareable resources between admission plugins. After initialization the resources have to be set separately

type PluginInitializers

type PluginInitializers []PluginInitializer

func (PluginInitializers) Initialize

func (pp PluginInitializers) Initialize(plugin Interface)

type Plugins

type Plugins struct {
	// contains filtered or unexported fields
}

func NewPlugins

func NewPlugins() *Plugins

func (*Plugins) InitPlugin

func (ps *Plugins) InitPlugin(name string, config io.Reader, pluginInitializer PluginInitializer) (Interface, error)

InitPlugin creates an instance of the named interface.

func (*Plugins) NewFromPlugins

func (ps *Plugins) NewFromPlugins(pluginNames []string, configProvider ConfigProvider, pluginInitializer PluginInitializer, decorator Decorator) (Interface, error)

NewFromPlugins returns an admission.Interface that will enforce admission control decisions of all the given plugins.

func (*Plugins) Register

func (ps *Plugins) Register(name string, plugin Factory)

Register registers a plugin Factory by name. This is expected to happen during app startup.

func (*Plugins) Registered

func (ps *Plugins) Registered() []string

Registered enumerates the names of all registered plugins.

type ReadyFunc

type ReadyFunc func() bool

ReadyFunc is a function that returns true if the admission controller is ready to handle requests.

type ReinvocationContext

type ReinvocationContext interface {
	// IsReinvoke returns true if the current admission check is a re-invocation.
	IsReinvoke() bool
	// SetIsReinvoke sets the current admission check as a re-invocation.
	SetIsReinvoke()
	// ShouldReinvoke returns true if any plugin has requested a re-invocation.
	ShouldReinvoke() bool
	// SetShouldReinvoke signals that a re-invocation is desired.
	SetShouldReinvoke()
	// AddValue set a value for a plugin name, possibly overriding a previous value.
	SetValue(plugin string, v interface{})
	// Value reads a value for a webhook.
	Value(plugin string) interface{}
}

ReinvocationContext provides access to the admission related state required to implement the re-invocation policy.

type RuntimeObjectInterfaces

type RuntimeObjectInterfaces struct {
	runtime.ObjectCreater
	runtime.ObjectTyper
	runtime.ObjectDefaulter
	runtime.ObjectConvertor
	runtime.EquivalentResourceMapper
}

func (*RuntimeObjectInterfaces) GetEquivalentResourceMapper

func (r *RuntimeObjectInterfaces) GetEquivalentResourceMapper() runtime.EquivalentResourceMapper

func (*RuntimeObjectInterfaces) GetObjectConvertor

func (r *RuntimeObjectInterfaces) GetObjectConvertor() runtime.ObjectConvertor

func (*RuntimeObjectInterfaces) GetObjectCreater

func (r *RuntimeObjectInterfaces) GetObjectCreater() runtime.ObjectCreater

func (*RuntimeObjectInterfaces) GetObjectDefaulter

func (r *RuntimeObjectInterfaces) GetObjectDefaulter() runtime.ObjectDefaulter

func (*RuntimeObjectInterfaces) GetObjectTyper

func (r *RuntimeObjectInterfaces) GetObjectTyper() runtime.ObjectTyper

type ValidationInterface

type ValidationInterface interface {
	Interface

	// Validate makes an admission decision based on the request attributes.  It is NOT allowed to mutate
	// Context is used only for timeout/deadline/cancellation and tracing information.
	Validate(ctx context.Context, a Attributes, o ObjectInterfaces) (err error)
}

ValidationInterface is an abstract, pluggable interface for Admission Control decisions.

Directories

Path Synopsis
configuration
initializer
metrics
plugin/namespace/lifecycle
plugin/webhook
plugin/webhook/config
plugin/webhook/config/apis/webhookadmission
plugin/webhook/config/apis/webhookadmission/install Package install installs the experimental API group, making it available as an option to all of the API encoding/decoding machinery.
plugin/webhook/config/apis/webhookadmission/v1 Package v1 is the v1 version of the API.
plugin/webhook/config/apis/webhookadmission/v1alpha1 Package v1alpha1 is the v1alpha1 version of the API.
plugin/webhook/errors Package errors contains utilities for admission webhook specific errors
plugin/webhook/generic
plugin/webhook/initializer
plugin/webhook/mutating Package mutating delegates admission checks to dynamically configured mutating webhooks.
plugin/webhook/namespace Package namespace defines the utilities that are used by the webhook plugin to decide if a webhook should be applied to an object based on its namespace.
plugin/webhook/object Package object defines the utilities that are used by the webhook plugin to decide if a webhook should run, as long as either the old object or the new object has labels matching the webhook config's objectSelector.
plugin/webhook/request Package request creates admissionReview request based on admission attributes.
plugin/webhook/rules
plugin/webhook/testcerts Package testcerts contains generated key pairs used by the unit tests of mutating and validating webhooks.
plugin/webhook/testing
plugin/webhook/testing/main
plugin/webhook/util
plugin/webhook/validating Package validating makes calls to validating (i.e., non-mutating) webhooks during the admission process.
testing