fix: generate VAPs that match all resources when kinds is set to * (#10208)

Signed-off-by: Mariam Fahmy <mariam.fahmy@nirmata.com>

pkg/validatingadmissionpolicy/builder.go

@@ -150,55 +150,69 @@ func constructValidatingAdmissionPolicyRules(discoveryClient dclient.IDiscovery,
 	// apiVersions: ["version"]
 	// resources:   ["resource"]
 	for _, kind := range res.Kinds {
-		group, version, kind, subresource := kubeutils.ParseKindSelector(kind)
-		gvrss, err := discoveryClient.FindResources(group, version, kind, subresource)
-		if err != nil {
-			return err
-		}
-		if len(gvrss) != 1 {
-			return fmt.Errorf("no unique match for kind %s", kind)
-		}
+		var r admissionregistrationv1alpha1.NamedRuleWithOperations
 
-		for topLevelApi, apiResource := range gvrss {
-			var resources []string
-			resources = append(resources, apiResource.Name)
-			// if we have pods, we add pods/ephemeralcontainers by default
-			if apiResource.Name == "pods" {
-				resources = append(resources, "pods/ephemeralcontainers")
+		if kind == "*" {
+			r = buildNamedRuleWithOperations(resourceNames, "*", "*", ops, "*")
+			*rules = append(*rules, r)
+		} else {
+			group, version, kind, subresource := kubeutils.ParseKindSelector(kind)
+			gvrss, err := discoveryClient.FindResources(group, version, kind, subresource)
+			if err != nil {
+				return err
+			}
+			if len(gvrss) != 1 {
+				return fmt.Errorf("no unique match for kind %s", kind)
 			}
 
-			isNewRule := true
-			// If there's a rule that contains both group and version, then the resource is appended to the existing rule instead of creating a new one.
-			// Example:  apiGroups:   ["apps"]
-			//           apiVersions: ["v1"]
-			//           resources:   ["deployments", "statefulsets"]
-			// Otherwise, a new rule is created.
-			for i := range *rules {
-				if slices.Contains((*rules)[i].APIGroups, topLevelApi.Group) && slices.Contains((*rules)[i].APIVersions, topLevelApi.Version) {
-					(*rules)[i].Resources = append((*rules)[i].Resources, resources...)
-					isNewRule = false
-					break
+			for topLevelApi, apiResource := range gvrss {
+				resources := []string{apiResource.Name}
+
+				// Add pods/ephemeralcontainers if pods resource.
+				if apiResource.Name == "pods" {
+					resources = append(resources, "pods/ephemeralcontainers")
 				}
-			}
-			if isNewRule {
-				r := admissionregistrationv1alpha1.NamedRuleWithOperations{
-					ResourceNames: resourceNames,
-					RuleWithOperations: admissionregistrationv1.RuleWithOperations{
-						Rule: admissionregistrationv1.Rule{
-							Resources:   resources,
-							APIGroups:   []string{topLevelApi.Group},
-							APIVersions: []string{topLevelApi.Version},
-						},
-						Operations: ops,
-					},
+
+				// Check if there's an existing rule for the same group and version.
+				var isNewRule bool = true
+				for i := range *rules {
+					if slices.Contains((*rules)[i].APIGroups, topLevelApi.Group) && slices.Contains((*rules)[i].APIVersions, topLevelApi.Version) {
+						(*rules)[i].Resources = append((*rules)[i].Resources, resources...)
+						isNewRule = false
+						break
+					}
+				}
+
+				// If no existing rule found, create a new one.
+				if isNewRule {
+					r = buildNamedRuleWithOperations(resourceNames, topLevelApi.Group, topLevelApi.Version, ops, resources...)
+					*rules = append(*rules, r)
 				}
-				*rules = append(*rules, r)
 			}
 		}
 	}
 	return nil
 }
 
+func buildNamedRuleWithOperations(
+	resourceNames []string,
+	group, version string,
+	operations []admissionregistrationv1.OperationType,
+	resources ...string,
+) admissionregistrationv1alpha1.NamedRuleWithOperations {
+	return admissionregistrationv1alpha1.NamedRuleWithOperations{
+		ResourceNames: resourceNames,
+		RuleWithOperations: admissionregistrationv1.RuleWithOperations{
+			Rule: admissionregistrationv1.Rule{
+				Resources:   resources,
+				APIGroups:   []string{group},
+				APIVersions: []string{version},
+			},
+			Operations: operations,
+		},
+	}
+}
+
 func translateOperations(operations []string) []admissionregistrationv1.OperationType {
 	var vapOperations []admissionregistrationv1.OperationType
 	for _, op := range operations {

test/conformance/chainsaw/generate-validating-admission-policy/clusterpolicy/standard/generate/cpol-match-kind-with-wildcard/chainsaw-test.yaml

@@ -0,0 +1,19 @@
+apiVersion: chainsaw.kyverno.io/v1alpha1
+kind: Test
+metadata:
+  creationTimestamp: null
+  name: cpol-match-kind-with-wildcard
+spec:
+  steps:
+  - name: step-01
+    try:
+    - apply:
+        file: policy.yaml
+    - assert:
+        file: policy-assert.yaml
+  - name: step-02
+    try:
+    - assert:
+        file: validatingadmissionpolicy.yaml
+    - assert:
+        file: validatingadmissionpolicybinding.yaml

test/conformance/chainsaw/generate-validating-admission-policy/clusterpolicy/standard/generate/cpol-match-kind-with-wildcard/policy-assert.yaml

@@ -0,0 +1,10 @@
+apiVersion: kyverno.io/v1
+kind: ClusterPolicy
+metadata:
+  name: check-label-app4
+status:
+  conditions:
+  - reason: Succeeded
+    status: "True"
+    type: Ready
+  

test/conformance/chainsaw/generate-validating-admission-policy/clusterpolicy/standard/generate/cpol-match-kind-with-wildcard/policy.yaml

@@ -0,0 +1,21 @@
+apiVersion: kyverno.io/v1
+kind: ClusterPolicy
+metadata:
+  name: check-label-app4
+spec:
+  validationFailureAction: Audit
+  background: false
+  rules:
+    - name: check-label-app
+      match:
+        all:
+        - resources:
+            kinds:
+            - '*'
+            namespaces:
+            - production
+            - staging
+      validate:
+        cel:
+          expressions:
+            - expression: "'app' in object.metadata.labels"

test/conformance/chainsaw/generate-validating-admission-policy/clusterpolicy/standard/generate/cpol-match-kind-with-wildcard/validatingadmissionpolicy.yaml

@@ -0,0 +1,32 @@
+apiVersion: admissionregistration.k8s.io/v1alpha1
+kind: ValidatingAdmissionPolicy
+metadata:
+  labels:
+    app.kubernetes.io/managed-by: kyverno
+  name: check-label-app4
+  ownerReferences:
+  - apiVersion: kyverno.io/v1
+    kind: ClusterPolicy
+    name: check-label-app4
+spec:
+  failurePolicy: Fail
+  matchConstraints:
+    namespaceSelector:
+      matchExpressions:
+      - key: kubernetes.io/metadata.name
+        operator: In
+        values:
+        - production
+        - staging
+    resourceRules:
+    - apiGroups:
+      - '*'
+      apiVersions:
+      - '*'
+      operations:
+      - CREATE
+      - UPDATE
+      resources:
+      - '*'
+  validations:
+  - expression: '''app'' in object.metadata.labels'

test/conformance/chainsaw/generate-validating-admission-policy/clusterpolicy/standard/generate/cpol-match-kind-with-wildcard/validatingadmissionpolicybinding.yaml

@@ -0,0 +1,13 @@
+apiVersion: admissionregistration.k8s.io/v1alpha1
+kind: ValidatingAdmissionPolicyBinding
+metadata:
+  labels:
+    app.kubernetes.io/managed-by: kyverno
+  name: check-label-app4-binding
+  ownerReferences:
+  - apiVersion: kyverno.io/v1
+    kind: ClusterPolicy
+    name: check-label-app4
+spec:
+  policyName: check-label-app4
+  validationActions: [Audit, Warn]

test/conformance/chainsaw/generate-validating-admission-policy/clusterpolicy/standard/generate/cpol-match-resource-in-specific-namespace/policy-assert.yaml

@@ -7,6 +7,4 @@ status:
   - reason: Succeeded
     status: "True"
     type: Ready
-  validatingadmissionpolicy:
-    generated: true