/
syncset_validating_admission_hook.go
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/
syncset_validating_admission_hook.go
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package validatingwebhooks
import (
"encoding/json"
"net/http"
log "github.com/sirupsen/logrus"
admissionv1beta1 "k8s.io/api/admission/v1beta1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/validation/field"
"k8s.io/client-go/rest"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
hivev1 "github.com/openshift/hive/pkg/apis/hive/v1"
)
const (
syncSetGroup = "hive.openshift.io"
syncSetVersion = "v1"
syncSetResource = "syncsets"
)
var invalidResourceGroupKinds = map[string]map[string]bool{
"authorization.openshift.io": {
"Role": true,
"RoleBinding": true,
"ClusterRole": true,
"ClusterRoleBinding": true,
"SubjectAccessReview": true,
},
}
var validPatchTypes = map[string]bool{
"json": true,
"merge": true,
"strategic": true,
}
var validPatchTypeSlice = []string{"json", "merge", "strategic"}
var (
validResourceApplyModes = map[hivev1.SyncSetResourceApplyMode]bool{
hivev1.UpsertResourceApplyMode: true,
hivev1.SyncResourceApplyMode: true,
}
validResourceApplyModeSlice = func() []string {
v := make([]string, 0, len(validResourceApplyModes))
for m := range validResourceApplyModes {
v = append(v, string(m))
}
return v
}()
)
// SyncSetValidatingAdmissionHook is a struct that is used to reference what code should be run by the generic-admission-server.
type SyncSetValidatingAdmissionHook struct {
decoder *admission.Decoder
}
// NewSyncSetValidatingAdmissionHook constructs a new SyncSetValidatingAdmissionHook
func NewSyncSetValidatingAdmissionHook(decoder *admission.Decoder) *SyncSetValidatingAdmissionHook {
return &SyncSetValidatingAdmissionHook{decoder: decoder}
}
// ValidatingResource is called by generic-admission-server on startup to register the returned REST resource through which the
// webhook is accessed by the kube apiserver.
// For example, generic-admission-server uses the data below to register the webhook on the REST resource "/apis/admission.hive.openshift.io/v1/syncsetvalidators".
// When the kube apiserver calls this registered REST resource, the generic-admission-server calls the Validate() method below.
func (a *SyncSetValidatingAdmissionHook) ValidatingResource() (plural schema.GroupVersionResource, singular string) {
log.WithFields(log.Fields{
"group": "admission.hive.openshift.io",
"version": "v1",
"resource": "syncsetvalidator",
}).Info("Registering validation REST resource")
// NOTE: This GVR is meant to be different than the SyncSet CRD GVR which has group "hive.openshift.io".
return schema.GroupVersionResource{
Group: "admission.hive.openshift.io",
Version: "v1",
Resource: "syncsetvalidators",
},
"syncsetvalidator"
}
// Initialize is called by generic-admission-server on startup to setup any special initialization that your webhook needs.
func (a *SyncSetValidatingAdmissionHook) Initialize(kubeClientConfig *rest.Config, stopCh <-chan struct{}) error {
log.WithFields(log.Fields{
"group": "admission.hive.openshift.io",
"version": "v1",
"resource": "syncsetvalidator",
}).Info("Initializing validation REST resource")
return nil // No initialization needed right now.
}
// Validate is called by generic-admission-server when the registered REST resource above is called with an admission request.
// Usually it's the kube apiserver that is making the admission validation request.
func (a *SyncSetValidatingAdmissionHook) Validate(admissionSpec *admissionv1beta1.AdmissionRequest) *admissionv1beta1.AdmissionResponse {
contextLogger := log.WithFields(log.Fields{
"operation": admissionSpec.Operation,
"group": admissionSpec.Resource.Group,
"version": admissionSpec.Resource.Version,
"resource": admissionSpec.Resource.Resource,
"method": "Validate",
})
if !a.shouldValidate(admissionSpec) {
contextLogger.Info("Skipping validation for request")
// The request object isn't something that this validator should validate.
// Therefore, we say that it's allowed.
return &admissionv1beta1.AdmissionResponse{
Allowed: true,
}
}
contextLogger.Info("Validating request")
if admissionSpec.Operation == admissionv1beta1.Create {
return a.validateCreate(admissionSpec)
}
if admissionSpec.Operation == admissionv1beta1.Update {
return a.validateUpdate(admissionSpec)
}
// We're only validating creates and updates at this time, so all other operations are explicitly allowed.
contextLogger.Info("Successful validation")
return &admissionv1beta1.AdmissionResponse{
Allowed: true,
}
}
// shouldValidate explicitly checks if the request should validated. For example, this webhook may have accidentally been registered to check
// the validity of some other type of object with a different GVR.
func (a *SyncSetValidatingAdmissionHook) shouldValidate(admissionSpec *admissionv1beta1.AdmissionRequest) bool {
contextLogger := log.WithFields(log.Fields{
"operation": admissionSpec.Operation,
"group": admissionSpec.Resource.Group,
"version": admissionSpec.Resource.Version,
"resource": admissionSpec.Resource.Resource,
"method": "shouldValidate",
})
if admissionSpec.Resource.Group != syncSetGroup {
contextLogger.Debug("Returning False, not our group")
return false
}
if admissionSpec.Resource.Version != syncSetVersion {
contextLogger.Debug("Returning False, it's our group, but not the right version")
return false
}
if admissionSpec.Resource.Resource != syncSetResource {
contextLogger.Debug("Returning False, it's our group and version, but not the right resource")
return false
}
// If we get here, then we're supposed to validate the object.
contextLogger.Debug("Returning True, passed all prerequisites.")
return true
}
// validateCreate specifically validates create operations for SyncSet objects.
func (a *SyncSetValidatingAdmissionHook) validateCreate(admissionSpec *admissionv1beta1.AdmissionRequest) *admissionv1beta1.AdmissionResponse {
contextLogger := log.WithFields(log.Fields{
"operation": admissionSpec.Operation,
"group": admissionSpec.Resource.Group,
"version": admissionSpec.Resource.Version,
"resource": admissionSpec.Resource.Resource,
"method": "validateCreate",
})
newObject := &hivev1.SyncSet{}
if err := a.decoder.DecodeRaw(admissionSpec.Object, newObject); err != nil {
contextLogger.Errorf("Failed unmarshaling Object: %v", err.Error())
return &admissionv1beta1.AdmissionResponse{
Allowed: false,
Result: &metav1.Status{
Status: metav1.StatusFailure, Code: http.StatusBadRequest, Reason: metav1.StatusReasonBadRequest,
Message: err.Error(),
},
}
}
// Add the new data to the contextLogger
contextLogger.Data["object.Name"] = newObject.Name
allErrs := field.ErrorList{}
allErrs = append(allErrs, validateResources(newObject.Spec.Resources, field.NewPath("spec").Child("resources"))...)
allErrs = append(allErrs, validatePatches(newObject.Spec.Patches, field.NewPath("spec").Child("patches"))...)
allErrs = append(allErrs, validateSecrets(newObject.Spec.Secrets, field.NewPath("spec").Child("secretMappings"))...)
allErrs = append(allErrs, validateSourceSecretInSyncSetNamespace(newObject.Spec.Secrets, newObject.Namespace, field.NewPath("spec", "secretMappings"))...)
allErrs = append(allErrs, validateResourceApplyMode(newObject.Spec.ResourceApplyMode, field.NewPath("spec", "resourceApplyMode"))...)
if len(allErrs) > 0 {
statusError := errors.NewInvalid(newObject.GroupVersionKind().GroupKind(), newObject.Name, allErrs).Status()
contextLogger.Infof(statusError.Message)
return &admissionv1beta1.AdmissionResponse{
Allowed: false,
Result: &statusError,
}
}
// If we get here, then all checks passed, so the object is valid.
contextLogger.Info("Successful validation")
return &admissionv1beta1.AdmissionResponse{
Allowed: true,
}
}
// validateUpdate specifically validates update operations for SyncSet objects.
func (a *SyncSetValidatingAdmissionHook) validateUpdate(admissionSpec *admissionv1beta1.AdmissionRequest) *admissionv1beta1.AdmissionResponse {
contextLogger := log.WithFields(log.Fields{
"operation": admissionSpec.Operation,
"group": admissionSpec.Resource.Group,
"version": admissionSpec.Resource.Version,
"resource": admissionSpec.Resource.Resource,
"method": "validateUpdate",
})
newObject := &hivev1.SyncSet{}
if err := a.decoder.DecodeRaw(admissionSpec.Object, newObject); err != nil {
contextLogger.Errorf("Failed unmarshaling Object: %v", err.Error())
return &admissionv1beta1.AdmissionResponse{
Allowed: false,
Result: &metav1.Status{
Status: metav1.StatusFailure, Code: http.StatusBadRequest, Reason: metav1.StatusReasonBadRequest,
Message: err.Error(),
},
}
}
// Add the new data to the contextLogger
contextLogger.Data["object.Name"] = newObject.Name
allErrs := field.ErrorList{}
allErrs = append(allErrs, validateResources(newObject.Spec.Resources, field.NewPath("spec", "resources"))...)
allErrs = append(allErrs, validatePatches(newObject.Spec.Patches, field.NewPath("spec", "patches"))...)
allErrs = append(allErrs, validateSecrets(newObject.Spec.Secrets, field.NewPath("spec", "secretMappings"))...)
allErrs = append(allErrs, validateSourceSecretInSyncSetNamespace(newObject.Spec.Secrets, newObject.Namespace, field.NewPath("spec", "secretMappings"))...)
allErrs = append(allErrs, validateResourceApplyMode(newObject.Spec.ResourceApplyMode, field.NewPath("spec", "resourceApplyMode"))...)
if len(allErrs) > 0 {
statusError := errors.NewInvalid(newObject.GroupVersionKind().GroupKind(), newObject.Name, allErrs).Status()
contextLogger.Infof(statusError.Message)
return &admissionv1beta1.AdmissionResponse{
Allowed: false,
Result: &statusError,
}
}
// If we get here, then all checks passed, so the object is valid.
contextLogger.Info("Successful validation")
return &admissionv1beta1.AdmissionResponse{
Allowed: true,
}
}
func validatePatches(patches []hivev1.SyncObjectPatch, fldPath *field.Path) field.ErrorList {
allErrs := field.ErrorList{}
for i, patch := range patches {
if !validPatchTypes[patch.PatchType] {
allErrs = append(allErrs, field.NotSupported(fldPath.Index(i).Child("PatchType"), patch.PatchType, validPatchTypeSlice))
}
}
return allErrs
}
func validateResourceApplyMode(resourceApplyMode hivev1.SyncSetResourceApplyMode, fldPath *field.Path) field.ErrorList {
allErrs := field.ErrorList{}
if resourceApplyMode != "" && !validResourceApplyModes[resourceApplyMode] {
allErrs = append(allErrs, field.NotSupported(fldPath, resourceApplyMode, validResourceApplyModeSlice))
}
return allErrs
}
func validateResources(resources []runtime.RawExtension, fldPath *field.Path) field.ErrorList {
allErrs := field.ErrorList{}
for i, resource := range resources {
allErrs = append(allErrs, validateResource(resource, fldPath.Index(i))...)
}
return allErrs
}
func validateResource(resource runtime.RawExtension, fldPath *field.Path) field.ErrorList {
allErrs := field.ErrorList{}
rType := &metav1.TypeMeta{}
err := json.Unmarshal(resource.Raw, rType)
if err != nil {
allErrs = append(allErrs, field.Invalid(fldPath, resource.Raw, "Unable to unmarshal resource Kind and APIVersion"))
return allErrs
}
if invalidResourceGroupKinds[rType.GroupVersionKind().Group][rType.Kind] {
allErrs = append(allErrs, field.Invalid(fldPath.Child("APIVersion"), rType.APIVersion, "must use kubernetes group for this resource kind"))
}
return allErrs
}
func validateSecrets(secrets []hivev1.SecretMapping, fldPath *field.Path) field.ErrorList {
allErrs := field.ErrorList{}
for i, secret := range secrets {
allErrs = append(allErrs, validateSecretRef(secret.SourceRef, fldPath.Index(i).Child("sourceRef"))...)
allErrs = append(allErrs, validateSecretRef(secret.TargetRef, fldPath.Index(i).Child("targetRef"))...)
}
return allErrs
}
func validateSourceSecretInSyncSetNamespace(secrets []hivev1.SecretMapping, syncSetNS string, fldPath *field.Path) field.ErrorList {
allErrs := field.ErrorList{}
for i, secret := range secrets {
if secret.SourceRef.Namespace != syncSetNS && secret.SourceRef.Namespace != "" {
path := fldPath.Index(i).Child("sourceRef")
allErrs = append(allErrs, field.Invalid(path.Child("namespace"), secret.SourceRef.Namespace,
"source secret reference must be in same namespace as SyncSet"))
}
}
return allErrs
}
func validateSecretRef(ref hivev1.SecretReference, fldPath *field.Path) field.ErrorList {
allErrs := field.ErrorList{}
if len(ref.Name) == 0 {
allErrs = append(allErrs, field.Required(fldPath.Child("name"), "Name is required"))
}
return allErrs
}