initial commit

definitions/init_configMap.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: init-config
+  namespace: kyverno
+data:
+  # resource types to be skipped by kyverno policy engine
+  resourceFilters: "[Event,*,*][*,kube-system,*][*,kube-public,*][*,kube-node-lease,*][Node,*,*][APIService,*,*][TokenReview,*,*][SubjectAccessReview,*,*][*,kyverno,*]"

main.go

@@ -21,12 +21,12 @@ import (
 )
 
 var (
-	kubeconfig        string
-	serverIP          string
-	filterK8Resources string
-	cpu               bool
-	memory            bool
-	webhookTimeout    int
+	kubeconfig string
+	serverIP   string
+	// filterK8Resources string
+	cpu            bool
+	memory         bool
+	webhookTimeout int
 )
 
 // TODO: tune resync time differently for each informer
@@ -37,8 +37,10 @@ func main() {
 	printVersionInfo()
 	// profile cpu and memory consuption
 	prof = enableProfiling(cpu, memory)
-	// cleanUp Channel
+	// cleanUp channel
 	cleanUp := make(chan struct{})
+	// SIGINT & SIGTERM channel
+	stopCh := signals.SetupSignalHandler()
 	// CLIENT CONFIG
 	clientConfig, err := createClientConfig(kubeconfig)
 	if err != nil {
@@ -90,6 +92,14 @@ func main() {
 	// - cache resync time: 10 seconds
 	kubeInformer := kubeinformers.NewSharedInformerFactoryWithOptions(kubeClient, 10*time.Second)
 
+	// Configuration Data
+	// dyamically load the configuration from configMap
+	// - resource filters
+	// if the configMap is update, the configuration will be updated :D
+	configData, err := config.NewConfigData(clientConfig, kubeInformer.Core().V1().ConfigMaps(), stopCh)
+	if err != nil {
+		glog.Fatalf("error loading dynamic configuration: %v", err)
+	}
 	// EVENT GENERATOR
 	// - generate event with retry mechanism
 	egen := event.NewEventGenerator(client, pInformer.Kyverno().V1alpha1().ClusterPolicies())
@@ -99,7 +109,7 @@ func main() {
 	// - process policy on existing resources
 	// - status aggregator: recieves stats when a policy is applied
 	//					    & updates the policy status
-	pc, err := policy.NewPolicyController(pclient, client, pInformer.Kyverno().V1alpha1().ClusterPolicies(), pInformer.Kyverno().V1alpha1().ClusterPolicyViolations(), egen, kubeInformer.Admissionregistration().V1beta1().MutatingWebhookConfigurations(), webhookRegistrationClient, filterK8Resources)
+	pc, err := policy.NewPolicyController(pclient, client, pInformer.Kyverno().V1alpha1().ClusterPolicies(), pInformer.Kyverno().V1alpha1().ClusterPolicyViolations(), egen, kubeInformer.Admissionregistration().V1beta1().MutatingWebhookConfigurations(), webhookRegistrationClient, configData)
 	if err != nil {
 		glog.Fatalf("error creating policy controller: %v\n", err)
 	}
@@ -114,7 +124,7 @@ func main() {
 
 	// GENERATE CONTROLLER
 	// - watches for Namespace resource and generates resource based on the policy generate rule
-	nsc := namespace.NewNamespaceController(pclient, client, kubeInformer.Core().V1().Namespaces(), pInformer.Kyverno().V1alpha1().ClusterPolicies(), pInformer.Kyverno().V1alpha1().ClusterPolicyViolations(), pc.GetPolicyStatusAggregator(), egen, filterK8Resources)
+	nsc := namespace.NewNamespaceController(pclient, client, kubeInformer.Core().V1().Namespaces(), pInformer.Kyverno().V1alpha1().ClusterPolicies(), pInformer.Kyverno().V1alpha1().ClusterPolicyViolations(), pc.GetPolicyStatusAggregator(), egen, configData)
 
 	// CONFIGURE CERTIFICATES
 	tlsPair, err := initTLSPemPair(clientConfig, client)
@@ -137,13 +147,11 @@ func main() {
 	// -- annotations on resources with update details on mutation JSON patches
 	// -- generate policy violation resource
 	// -- generate events on policy and resource
-	server, err := webhooks.NewWebhookServer(pclient, client, tlsPair, pInformer.Kyverno().V1alpha1().ClusterPolicies(), pInformer.Kyverno().V1alpha1().ClusterPolicyViolations(), egen, webhookRegistrationClient, pc.GetPolicyStatusAggregator(), filterK8Resources, cleanUp)
+	server, err := webhooks.NewWebhookServer(pclient, client, tlsPair, pInformer.Kyverno().V1alpha1().ClusterPolicies(), pInformer.Kyverno().V1alpha1().ClusterPolicyViolations(), egen, webhookRegistrationClient, pc.GetPolicyStatusAggregator(), configData, cleanUp)
 	if err != nil {
 		glog.Fatalf("Unable to create webhook server: %v\n", err)
 	}
 
-	stopCh := signals.SetupSignalHandler()
-
 	// Start the components
 	pInformer.Start(stopCh)
 	kubeInformer.Start(stopCh)
@@ -174,7 +182,7 @@ func init() {
 	flag.IntVar(&webhookTimeout, "webhooktimeout", 2, "timeout for webhook configurations")
 	flag.StringVar(&kubeconfig, "kubeconfig", "", "Path to a kubeconfig. Only required if out-of-cluster.")
 	flag.StringVar(&serverIP, "serverIP", "", "IP address where Kyverno controller runs. Only required if out-of-cluster.")
-	flag.StringVar(&filterK8Resources, "filterK8Resources", "", "k8 resource in format [kind,namespace,name] where policy is not evaluated by the admission webhook. example --filterKind \"[Deployment, kyverno, kyverno]\" --filterKind \"[Deployment, kyverno, kyverno],[Events, *, *]\"")
+	// flag.StringVar(&filterK8Resources, "filterK8Resources", "", "k8 resource in format [kind,namespace,name] where policy is not evaluated by the admission webhook. example --filterKind \"[Deployment, kyverno, kyverno]\" --filterKind \"[Deployment, kyverno, kyverno],[Events, *, *]\"")
 	config.LogDefaultFlags()
 	flag.Parse()
 }

pkg/config/dynamicconfig.go

@@ -0,0 +1,194 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"reflect"
+	"regexp"
+	"strings"
+	"sync"
+
+	"github.com/golang/glog"
+	"github.com/minio/minio/pkg/wildcard"
+	v1 "k8s.io/api/core/v1"
+	informers "k8s.io/client-go/informers/core/v1"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/cache"
+)
+
+// read the conifgMap with name in env:INIT_CONFIG
+// this configmap stores the resources that are to be filtered
+const cmNameEnv string = "INIT_CONFIG"
+const cmDataField string = "resourceFilters"
+
+type ConfigData struct {
+	client kubernetes.Interface
+	// configMap Name
+	cmName string
+	// lock configuration
+	mux sync.RWMutex
+	// configuration data
+	filters []k8Resource
+}
+
+// ToFilter checks if the given resource is set to be filtered in the configuration
+func (cd *ConfigData) ToFilter(kind, namespace, name string) bool {
+	cd.mux.RLock()
+	defer cd.mux.RUnlock()
+	for _, f := range cd.filters {
+		if wildcard.Match(f.Kind, kind) && wildcard.Match(f.Namespace, namespace) && wildcard.Match(f.Name, name) {
+			return true
+		}
+	}
+	return false
+}
+
+// Interface to be used by consumer to check filters
+type Interface interface {
+	ToFilter(kind, namespace, name string) bool
+}
+
+// NewConfigData ...
+func NewConfigData(restconfig *rest.Config, cmInformer informers.ConfigMapInformer, stopCh <-chan struct{}) (*ConfigData, error) {
+	// get the client
+	kclient, err := kubernetes.NewForConfig(restconfig)
+	if err != nil {
+		return nil, err
+	}
+	// environment var is read at start only
+	if cmNameEnv == "" {
+		glog.Info("ConfigMap name not defined in env:INIT_CONFIG: loading no default configuration")
+	}
+	cd := ConfigData{
+		client: kclient,
+		cmName: os.Getenv(cmNameEnv),
+	}
+
+	cmInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
+		AddFunc:    cd.addCM,
+		UpdateFunc: cd.updateCM,
+		DeleteFunc: cd.deleteCM,
+	})
+	// wait for cache to populate first time
+	if !cache.WaitForCacheSync(stopCh, cmInformer.Informer().HasSynced) {
+		return nil, fmt.Errorf("Configuration: Failed to sync informer cache")
+	}
+	return &cd, nil
+}
+
+func (cd *ConfigData) addCM(obj interface{}) {
+	cm := obj.(*v1.ConfigMap)
+	if cm.Name != cd.cmName {
+		return
+	}
+	cd.load(*cm)
+	// else load the configuration
+}
+
+func (cd *ConfigData) updateCM(old, cur interface{}) {
+	cm := cur.(*v1.ConfigMap)
+	if cm.Name != cd.cmName {
+		return
+	}
+	// if data has not changed then dont load configmap
+	cd.load(*cm)
+}
+
+func (cd *ConfigData) deleteCM(obj interface{}) {
+	cm, ok := obj.(*v1.ConfigMap)
+	if !ok {
+		tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
+		if !ok {
+			glog.Info(fmt.Errorf("Couldn't get object from tombstone %#v", obj))
+			return
+		}
+		_, ok = tombstone.Obj.(*v1.ConfigMap)
+		if !ok {
+			glog.Info(fmt.Errorf("Tombstone contained object that is not a ConfigMap %#v", obj))
+			return
+		}
+	}
+
+	if cm.Name != cd.cmName {
+		return
+	}
+	// remove the configuration paramaters
+	cd.unload(*cm)
+}
+
+func (cd *ConfigData) load(cm v1.ConfigMap) {
+	if cm.Data == nil {
+		glog.Infof("Configuration: No data defined in ConfigMap %s", cm.Name)
+		return
+	}
+	// get resource filters
+	filters, ok := cm.Data["resourceFilters"]
+	if !ok {
+		glog.Infof("Configuration: No resourceFilters defined in ConfigMap %s", cm.Name)
+		return
+	}
+	// filters is a string
+	if filters == "" {
+		glog.Infof("Configuration: resourceFilters is empty in ConfigMap %s", cm.Name)
+		return
+	}
+
+	// parse and load the configuration
+	cd.mux.Lock()
+	defer cd.mux.Unlock()
+
+	newFilters := parseKinds(filters)
+	if reflect.DeepEqual(newFilters, cd.filters) {
+		glog.Infof("Configuration: resourceFilters did not change in ConfigMap %s", cm.Name)
+		return
+	}
+	glog.V(4).Infof("Configuration: Old resource filters %v", cd.filters)
+	glog.Infof("Configuration: New resource filters to %v", newFilters)
+	// update filters
+	cd.filters = newFilters
+}
+
+func (cd *ConfigData) unload(cm v1.ConfigMap) {
+	// TODO pick one msg
+	glog.Infof("Configuration: ConfigMap %s deleted, removing configuration filters", cm.Name)
+	glog.Infof("Configuration: Removing all resource filters as ConfigMap %s deleted", cm.Name)
+	cd.mux.Lock()
+	defer cd.mux.Unlock()
+	cd.filters = []k8Resource{}
+}
+
+type k8Resource struct {
+	Kind      string //TODO: as we currently only support one GVK version, we use the kind only. But if we support multiple GVK, then GV need to be added
+	Namespace string
+	Name      string
+}
+
+//ParseKinds parses the kinds if a single string contains comma seperated kinds
+// {"1,2,3","4","5"} => {"1","2","3","4","5"}
+func parseKinds(list string) []k8Resource {
+	resources := []k8Resource{}
+	var resource k8Resource
+	re := regexp.MustCompile(`\[([^\[\]]*)\]`)
+	submatchall := re.FindAllString(list, -1)
+	for _, element := range submatchall {
+		element = strings.Trim(element, "[")
+		element = strings.Trim(element, "]")
+		elements := strings.Split(element, ",")
+		//TODO: wildcards for namespace and name
+		if len(elements) == 0 {
+			continue
+		}
+		if len(elements) == 3 {
+			resource = k8Resource{Kind: elements[0], Namespace: elements[1], Name: elements[2]}
+		}
+		if len(elements) == 2 {
+			resource = k8Resource{Kind: elements[0], Namespace: elements[1]}
+		}
+		if len(elements) == 1 {
+			resource = k8Resource{Kind: elements[0]}
+		}
+		resources = append(resources, resource)
+	}
+	return resources
+}

pkg/namespace/controller.go

@@ -7,10 +7,10 @@ import (
 
 	"github.com/golang/glog"
 	kyverno "github.com/nirmata/kyverno/pkg/api/kyverno/v1alpha1"
+	"github.com/nirmata/kyverno/pkg/config"
 	client "github.com/nirmata/kyverno/pkg/dclient"
 	"github.com/nirmata/kyverno/pkg/event"
 	"github.com/nirmata/kyverno/pkg/policy"
-	"github.com/nirmata/kyverno/pkg/utils"
 	"k8s.io/apimachinery/pkg/api/errors"
 
 	kyvernoclient "github.com/nirmata/kyverno/pkg/client/clientset/versioned"
@@ -56,7 +56,9 @@ type NamespaceController struct {
 	// Resource manager, manages the mapping for already processed resource
 	rm resourceManager
 	// filter the resources defined in the list
-	filterK8Resources []utils.K8Resource
+	// filterK8Resources []utils.K8Resource
+	// helpers to validate against current loaded configuration
+	configHandler config.Interface
 }
 
 //NewNamespaceController returns a new Controller to manage generation rules
@@ -67,15 +69,15 @@ func NewNamespaceController(kyvernoClient *kyvernoclient.Clientset,
 	pvInformer kyvernoinformer.ClusterPolicyViolationInformer,
 	policyStatus policy.PolicyStatusInterface,
 	eventGen event.Interface,
-	filterK8Resources string) *NamespaceController {
+	configHandler config.Interface) *NamespaceController {
 	//TODO: do we need to event recorder for this controller?
 	// create the controller
 	nsc := &NamespaceController{
-		client:            client,
-		kyvernoClient:     kyvernoClient,
-		eventGen:          eventGen,
-		queue:             workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "namespace"),
-		filterK8Resources: utils.ParseKinds(filterK8Resources),
+		client:        client,
+		kyvernoClient: kyvernoClient,
+		eventGen:      eventGen,
+		queue:         workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "namespace"),
+		configHandler: configHandler,
 	}
 
 	nsInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
@@ -231,7 +233,8 @@ func (nsc *NamespaceController) syncNamespace(key string) error {
 
 	// skip processing namespace if its been filtered
 	// exclude the filtered resources
-	if utils.SkipFilteredResources("Namespace", "", namespace.Name, nsc.filterK8Resources) {
+	if nsc.configHandler.ToFilter("Namespace", "", namespace.Name) {
+		// if utils.SkipFilteredResources("Namespace", "", namespace.Name, nsc.filterK8Resources) {
 		//TODO: improve the text
 		glog.V(4).Infof("excluding namespace %s as its a filtered resource", namespace.Name)
 		return nil

pkg/policy/controller.go

@@ -13,9 +13,9 @@ import (
 	"github.com/nirmata/kyverno/pkg/client/clientset/versioned/scheme"
 	kyvernoinformer "github.com/nirmata/kyverno/pkg/client/informers/externalversions/kyverno/v1alpha1"
 	kyvernolister "github.com/nirmata/kyverno/pkg/client/listers/kyverno/v1alpha1"
+	"github.com/nirmata/kyverno/pkg/config"
 	client "github.com/nirmata/kyverno/pkg/dclient"
 	"github.com/nirmata/kyverno/pkg/event"
-	"github.com/nirmata/kyverno/pkg/utils"
 	"github.com/nirmata/kyverno/pkg/webhookconfig"
 	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/errors"
@@ -73,15 +73,16 @@ type PolicyController struct {
 	webhookRegistrationClient *webhookconfig.WebhookRegistrationClient
 	// Resource manager, manages the mapping for already processed resource
 	rm resourceManager
-	// filter the resources defined in the list
-	filterK8Resources []utils.K8Resource
+	// helpers to validate against current loaded configuration
+	configHandler config.Interface
 	// recieves stats and aggregates details
 	statusAggregator *PolicyStatusAggregator
 }
 
 // NewPolicyController create a new PolicyController
 func NewPolicyController(kyvernoClient *kyvernoclient.Clientset, client *client.Client, pInformer kyvernoinformer.ClusterPolicyInformer, pvInformer kyvernoinformer.ClusterPolicyViolationInformer,
-	eventGen event.Interface, webhookInformer webhookinformer.MutatingWebhookConfigurationInformer, webhookRegistrationClient *webhookconfig.WebhookRegistrationClient, filterK8Resources string) (*PolicyController, error) {
+	eventGen event.Interface, webhookInformer webhookinformer.MutatingWebhookConfigurationInformer, webhookRegistrationClient *webhookconfig.WebhookRegistrationClient,
+	configHandler config.Interface) (*PolicyController, error) {
 	// Event broad caster
 	eventBroadcaster := record.NewBroadcaster()
 	eventBroadcaster.StartLogging(glog.Infof)
@@ -98,7 +99,8 @@ func NewPolicyController(kyvernoClient *kyvernoclient.Clientset, client *client.
 		eventRecorder:             eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: "policy_controller"}),
 		queue:                     workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "policy"),
 		webhookRegistrationClient: webhookRegistrationClient,
-		filterK8Resources:         utils.ParseKinds(filterK8Resources),
+		// filterK8Resources:         utils.ParseKinds(filterK8Resources),
+		configHandler: configHandler,
 	}
 
 	pc.pvControl = RealPVControl{Client: kyvernoClient, Recorder: pc.eventRecorder}

pkg/policy/existing.go

@@ -8,6 +8,7 @@ import (
 	"github.com/golang/glog"
 	"github.com/minio/minio/pkg/wildcard"
 	kyverno "github.com/nirmata/kyverno/pkg/api/kyverno/v1alpha1"
+	"github.com/nirmata/kyverno/pkg/config"
 	client "github.com/nirmata/kyverno/pkg/dclient"
 	"github.com/nirmata/kyverno/pkg/engine"
 	"github.com/nirmata/kyverno/pkg/utils"
@@ -22,7 +23,7 @@ func (pc *PolicyController) processExistingResources(policy kyverno.ClusterPolic
 	pc.rm.Drop()
 	var engineResponses []engine.EngineResponse
 	// get resource that are satisfy the resource description defined in the rules
-	resourceMap := listResources(pc.client, policy, pc.filterK8Resources)
+	resourceMap := listResources(pc.client, policy, pc.configHandler)
 	for _, resource := range resourceMap {
 		// pre-processing, check if the policy and resource version has been processed before
 		if !pc.rm.ProcessResource(policy.Name, policy.ResourceVersion, resource.GetKind(), resource.GetNamespace(), resource.GetName(), resource.GetResourceVersion()) {
@@ -40,7 +41,7 @@ func (pc *PolicyController) processExistingResources(policy kyverno.ClusterPolic
 	return engineResponses
 }
 
-func listResources(client *client.Client, policy kyverno.ClusterPolicy, filterK8Resources []utils.K8Resource) map[string]unstructured.Unstructured {
+func listResources(client *client.Client, policy kyverno.ClusterPolicy, configHandler config.Interface) map[string]unstructured.Unstructured {
 	// key uid
 	resourceMap := map[string]unstructured.Unstructured{}
 
@@ -69,7 +70,7 @@ func listResources(client *client.Client, policy kyverno.ClusterPolicy, filterK8
 
 			// get resources in the namespaces
 			for _, ns := range namespaces {
-				rMap := getResourcesPerNamespace(k, client, ns, rule, filterK8Resources)
+				rMap := getResourcesPerNamespace(k, client, ns, rule, configHandler)
 				mergeresources(resourceMap, rMap)
 			}
 
@@ -78,7 +79,7 @@ func listResources(client *client.Client, policy kyverno.ClusterPolicy, filterK8
 	return resourceMap
 }
 
-func getResourcesPerNamespace(kind string, client *client.Client, namespace string, rule kyverno.Rule, filterK8Resources []utils.K8Resource) map[string]unstructured.Unstructured {
+func getResourcesPerNamespace(kind string, client *client.Client, namespace string, rule kyverno.Rule, configHandler config.Interface) map[string]unstructured.Unstructured {
 	resourceMap := map[string]unstructured.Unstructured{}
 	// merge include and exclude label selector values
 	ls := rule.MatchResources.Selector
@@ -100,7 +101,7 @@ func getResourcesPerNamespace(kind string, client *client.Client, namespace stri
 			}
 		}
 		// Skip the filtered resources
-		if utils.SkipFilteredResources(r.GetKind(), r.GetNamespace(), r.GetName(), filterK8Resources) {
+		if configHandler.ToFilter(r.GetKind(), r.GetNamespace(), r.GetName()) {
 			continue
 		}
 
@@ -110,12 +111,12 @@ func getResourcesPerNamespace(kind string, client *client.Client, namespace stri
 
 	// exclude the resources
 	// skip resources to be filtered
-	excludeResources(resourceMap, rule.ExcludeResources.ResourceDescription, filterK8Resources)
+	excludeResources(resourceMap, rule.ExcludeResources.ResourceDescription, configHandler)
 	//	glog.V(4).Infof("resource map: %v", resourceMap)
 	return resourceMap
 }
 
-func excludeResources(included map[string]unstructured.Unstructured, exclude kyverno.ResourceDescription, filterK8Resources []utils.K8Resource) {
+func excludeResources(included map[string]unstructured.Unstructured, exclude kyverno.ResourceDescription, configHandler config.Interface) {
 	if reflect.DeepEqual(exclude, (kyverno.ResourceDescription{})) {
 		return
 	}
@@ -196,7 +197,7 @@ func excludeResources(included map[string]unstructured.Unstructured, exclude kyv
 			excludeEval = append(excludeEval, ret)
 		}
 		// exclude the filtered resources
-		if utils.SkipFilteredResources(resource.GetKind(), resource.GetNamespace(), resource.GetName(), filterK8Resources) {
+		if configHandler.ToFilter(resource.GetKind(), resource.GetNamespace(), resource.GetName()) {
 			//TODO: improve the text
 			glog.V(4).Infof("excluding resource %s/%s/%s as its satisfies the filtered resources", resource.GetKind(), resource.GetNamespace(), resource.GetName())
 			delete(included, uid)

pkg/utils/informer.go

@@ -1,20 +0,0 @@
-package utils
-
-import (
-	"github.com/golang/glog"
-	kubeinformers "k8s.io/client-go/informers"
-	"k8s.io/client-go/kubernetes"
-	"k8s.io/client-go/rest"
-)
-
-//NewKubeInformerFactory returns a kubeinformer
-func NewKubeInformerFactory(cfg *rest.Config) kubeinformers.SharedInformerFactory {
-	// kubernetes client
-	kubeClient, err := kubernetes.NewForConfig(cfg)
-	if err != nil {
-		glog.Errorf("error building kubernetes client: %s", err)
-	}
-
-	kubeInformerFactory := kubeinformers.NewSharedInformerFactory(kubeClient, 0)
-	return kubeInformerFactory
-}

pkg/utils/util.go

@@ -2,25 +2,16 @@ package utils
 
 import (
 	"reflect"
-	"regexp"
-	"strings"
 
 	"github.com/golang/glog"
 
 	"github.com/minio/minio/pkg/wildcard"
 	client "github.com/nirmata/kyverno/pkg/dclient"
-	"k8s.io/api/admission/v1beta1"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/rest"
 )
 
-type K8Resource struct {
-	Kind      string //TODO: as we currently only support one GVK version, we use the kind only. But if we support multiple GVK, then GV need to be added
-	Namespace string
-	Name      string
-}
-
 //Contains Check if strint is contained in a list of string
 func contains(list []string, element string, fn func(string, string) bool) bool {
 	for _, e := range list {
@@ -49,58 +40,6 @@ func compareString(str, name string) bool {
 	return str == name
 }
 
-//SkipFilteredResourcesReq checks if request is to be skipped based on filtered kinds
-func SkipFilteredResourcesReq(request *v1beta1.AdmissionRequest, filterK8Resources []K8Resource) bool {
-	kind := request.Kind.Kind
-	namespace := request.Namespace
-	name := request.Name
-	for _, r := range filterK8Resources {
-		if wildcard.Match(r.Kind, kind) && wildcard.Match(r.Namespace, namespace) && wildcard.Match(r.Name, name) {
-			return true
-		}
-	}
-	return false
-}
-
-//SkipFilteredResources checks if the resource is to be skipped based on filtered kinds
-func SkipFilteredResources(kind, namespace, name string, filterK8Resources []K8Resource) bool {
-	for _, r := range filterK8Resources {
-		if wildcard.Match(r.Kind, kind) && wildcard.Match(r.Namespace, namespace) && wildcard.Match(r.Name, name) {
-			return true
-		}
-	}
-	return false
-}
-
-//ParseKinds parses the kinds if a single string contains comma seperated kinds
-// {"1,2,3","4","5"} => {"1","2","3","4","5"}
-func ParseKinds(list string) []K8Resource {
-	resources := []K8Resource{}
-	var resource K8Resource
-	re := regexp.MustCompile(`\[([^\[\]]*)\]`)
-	submatchall := re.FindAllString(list, -1)
-	for _, element := range submatchall {
-		element = strings.Trim(element, "[")
-		element = strings.Trim(element, "]")
-		elements := strings.Split(element, ",")
-		//TODO: wildcards for namespace and name
-		if len(elements) == 0 {
-			continue
-		}
-		if len(elements) == 3 {
-			resource = K8Resource{Kind: elements[0], Namespace: elements[1], Name: elements[2]}
-		}
-		if len(elements) == 2 {
-			resource = K8Resource{Kind: elements[0], Namespace: elements[1]}
-		}
-		if len(elements) == 1 {
-			resource = K8Resource{Kind: elements[0]}
-		}
-		resources = append(resources, resource)
-	}
-	return resources
-}
-
 //NewKubeClient returns a new kubernetes client
 func NewKubeClient(config *rest.Config) (kubernetes.Interface, error) {
 	kclient, err := kubernetes.NewForConfig(config)

pkg/webhooks/server.go

@@ -19,7 +19,6 @@ import (
 	"github.com/nirmata/kyverno/pkg/event"
 	"github.com/nirmata/kyverno/pkg/policy"
 	tlsutils "github.com/nirmata/kyverno/pkg/tls"
-	"github.com/nirmata/kyverno/pkg/utils"
 	"github.com/nirmata/kyverno/pkg/webhookconfig"
 	v1beta1 "k8s.io/api/admission/v1beta1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -39,9 +38,11 @@ type WebhookServer struct {
 	eventGen                  event.Interface
 	webhookRegistrationClient *webhookconfig.WebhookRegistrationClient
 	// API to send policy stats for aggregation
-	policyStatus      policy.PolicyStatusInterface
-	filterK8Resources []utils.K8Resource
-	cleanUp           chan<- struct{}
+	policyStatus policy.PolicyStatusInterface
+	// helpers to validate against current loaded configuration
+	configHandler config.Interface
+	// channel for cleanup notification
+	cleanUp chan<- struct{}
 }
 
 // NewWebhookServer creates new instance of WebhookServer accordingly to given configuration
@@ -55,7 +56,7 @@ func NewWebhookServer(
 	eventGen event.Interface,
 	webhookRegistrationClient *webhookconfig.WebhookRegistrationClient,
 	policyStatus policy.PolicyStatusInterface,
-	filterK8Resources string,
+	configHandler config.Interface,
 	cleanUp chan<- struct{}) (*WebhookServer, error) {
 
 	if tlsPair == nil {
@@ -80,7 +81,7 @@ func NewWebhookServer(
 		eventGen:                  eventGen,
 		webhookRegistrationClient: webhookRegistrationClient,
 		policyStatus:              policyStatus,
-		filterK8Resources:         utils.ParseKinds(filterK8Resources),
+		configHandler:             configHandler,
 		cleanUp:                   cleanUp,
 	}
 	mux := http.NewServeMux()
@@ -112,20 +113,21 @@ func (ws *WebhookServer) serve(w http.ResponseWriter, r *http.Request) {
 	}
 
 	// Do not process the admission requests for kinds that are in filterKinds for filtering
-	if !utils.SkipFilteredResourcesReq(admissionReview.Request, ws.filterK8Resources) {
+	request := admissionReview.Request
+	if !ws.configHandler.ToFilter(request.Kind.Kind, request.Namespace, request.Name) {
 		// Resource CREATE
 		// Resource UPDATE
 		switch r.URL.Path {
 		case config.MutatingWebhookServicePath:
-			admissionReview.Response = ws.handleAdmissionRequest(admissionReview.Request)
+			admissionReview.Response = ws.handleAdmissionRequest(request)
 		case config.PolicyValidatingWebhookServicePath:
-			admissionReview.Response = ws.handlePolicyValidation(admissionReview.Request)
+			admissionReview.Response = ws.handlePolicyValidation(request)
 		case config.PolicyMutatingWebhookServicePath:
-			admissionReview.Response = ws.handlePolicyMutation(admissionReview.Request)
+			admissionReview.Response = ws.handlePolicyMutation(request)
 		}
 	}
 
-	admissionReview.Response.UID = admissionReview.Request.UID
+	admissionReview.Response.UID = request.UID
 
 	responseJSON, err := json.Marshal(admissionReview)
 	if err != nil {