fix: add celPreconditions in autogen rules (#11503)

pkg/autogen/v1/autogen.go

@@ -227,6 +227,9 @@ func convertRule(rule kyvernoRule, kind string) (*kyvernov1.Rule, error) {
 	if rule.Context != nil {
 		out.Context = *rule.Context
 	}
+	if rule.CELPreconditions != nil {
+		out.CELPreconditions = *rule.CELPreconditions
+	}
 	if rule.AnyAllConditions != nil {
 		out.SetAnyAllConditions(rule.AnyAllConditions.Conditions)
 	}

pkg/autogen/v1/rule.go

@@ -9,6 +9,7 @@ import (
 	"github.com/kyverno/kyverno/pkg/engine/variables"
 	datautils "github.com/kyverno/kyverno/pkg/utils/data"
 	kubeutils "github.com/kyverno/kyverno/pkg/utils/kube"
+	admissionregistrationv1beta1 "k8s.io/api/admissionregistration/v1beta1"
 )
 
 // the kyvernoRule holds the temporary kyverno rule struct
@@ -21,15 +22,16 @@ import (
 // https://github.com/kyverno/kyverno/issues/568
 
 type kyvernoRule struct {
-	Name                   string                        `json:"name"`
-	MatchResources         *kyvernov1.MatchResources     `json:"match"`
-	ExcludeResources       *kyvernov1.MatchResources     `json:"exclude,omitempty"`
-	Context                *[]kyvernov1.ContextEntry     `json:"context,omitempty"`
-	AnyAllConditions       *kyvernov1.ConditionsWrapper  `json:"preconditions,omitempty"`
-	Mutation               *kyvernov1.Mutation           `json:"mutate,omitempty"`
-	Validation             *kyvernov1.Validation         `json:"validate,omitempty"`
-	VerifyImages           []kyvernov1.ImageVerification `json:"verifyImages,omitempty"`
-	SkipBackgroundRequests *bool                         `json:"skipBackgroundRequests,omitempty"`
+	Name                   string                                         `json:"name"`
+	MatchResources         *kyvernov1.MatchResources                      `json:"match"`
+	ExcludeResources       *kyvernov1.MatchResources                      `json:"exclude,omitempty"`
+	CELPreconditions       *[]admissionregistrationv1beta1.MatchCondition `json:"celPreconditions,omitempty"`
+	Context                *[]kyvernov1.ContextEntry                      `json:"context,omitempty"`
+	AnyAllConditions       *kyvernov1.ConditionsWrapper                   `json:"preconditions,omitempty"`
+	Mutation               *kyvernov1.Mutation                            `json:"mutate,omitempty"`
+	Validation             *kyvernov1.Validation                          `json:"validate,omitempty"`
+	VerifyImages           []kyvernov1.ImageVerification                  `json:"verifyImages,omitempty"`
+	SkipBackgroundRequests *bool                                          `json:"skipBackgroundRequests,omitempty"`
 }
 
 func createRule(rule *kyvernov1.Rule) *kyvernoRule {
@@ -67,6 +69,9 @@ func createRule(rule *kyvernov1.Rule) *kyvernoRule {
 	if len(rule.Context) > 0 {
 		jsonFriendlyStruct.Context = &rule.DeepCopy().Context
 	}
+	if len(rule.CELPreconditions) > 0 {
+		jsonFriendlyStruct.CELPreconditions = &rule.DeepCopy().CELPreconditions
+	}
 	return &jsonFriendlyStruct
 }
 

test/conformance/chainsaw/autogen/cel-preconditions/README.md

@@ -0,0 +1,11 @@
+## Description
+
+The policy should contain autogen rules with cel preconditions correctly adjusted.
+
+## Expected Behavior
+
+The policy contains autogen rules with cel preconditions correctly adjusted.
+
+## Related Issue(s)
+
+- https://github.com/kyverno/kyverno/issues/11421

test/conformance/chainsaw/autogen/cel-preconditions/chainsaw-test.yaml

@@ -0,0 +1,25 @@
+# yaml-language-server: $schema=https://raw.githubusercontent.com/kyverno/chainsaw/main/.schemas/json/test-chainsaw-v1alpha1.json
+apiVersion: chainsaw.kyverno.io/v1alpha1
+kind: Test
+metadata:
+  name: cel-preconditions
+spec:
+  steps:
+  - name: create policy
+    use:
+      template: ../../_step-templates/create-policy.yaml
+      with:
+        bindings:
+        - name: file
+          value: policy.yaml
+  - name: wait policy ready
+    use:
+      template: ../../_step-templates/cluster-policy-ready.yaml
+      with:
+        bindings:
+        - name: name
+          value: disallow-privilege-escalation
+  - name: check autogen
+    try:
+    - assert:
+        file: check-autogen.yaml

test/conformance/chainsaw/autogen/cel-preconditions/check-autogen.yaml

@@ -0,0 +1,63 @@
+apiVersion: kyverno.io/v1
+kind: ClusterPolicy
+metadata:
+  name: disallow-privilege-escalation
+status:
+  autogen:
+    rules:
+    - celPreconditions:
+      - expression: has(object.spec.template.metadata.labels) && has(object.spec.template.metadata.labels.prod)
+          && object.spec.template.metadata.labels.prod == 'true'
+        name: Only for prod
+      match:
+        any:
+        - resources:
+            kinds:
+            - DaemonSet
+            - Deployment
+            - Job
+            - ReplicaSet
+            - ReplicationController
+            - StatefulSet
+            operations:
+            - CREATE
+            - UPDATE
+        resources: {}
+      name: autogen-privilege-escalation
+      skipBackgroundRequests: true
+      validate:
+        allowExistingViolations: true
+        cel:
+          expressions:
+          - expression: object.spec.template.spec.containers.all(container, has(container.securityContext)
+              && has(container.securityContext.allowPrivilegeEscalation) && container.securityContext.allowPrivilegeEscalation
+              == false)
+            message: Privilege escalation is disallowed. The field spec.containers[*].securityContext.allowPrivilegeEscalation
+              must be set to `false`.
+        failureAction: Enforce
+    - celPreconditions:
+      - expression: has(object.spec.jobTemplate.spec.template.metadata.labels) &&
+          has(object.spec.jobTemplate.spec.template.metadata.labels.prod) && object.spec.jobTemplate.spec.template.metadata.labels.prod
+          == 'true'
+        name: Only for prod
+      match:
+        any:
+        - resources:
+            kinds:
+            - CronJob
+            operations:
+            - CREATE
+            - UPDATE
+        resources: {}
+      name: autogen-cronjob-privilege-escalation
+      skipBackgroundRequests: true
+      validate:
+        allowExistingViolations: true
+        cel:
+          expressions:
+          - expression: object.spec.jobTemplate.spec.template.spec.containers.all(container,
+              has(container.securityContext) && has(container.securityContext.allowPrivilegeEscalation)
+              && container.securityContext.allowPrivilegeEscalation == false)
+            message: Privilege escalation is disallowed. The field spec.containers[*].securityContext.allowPrivilegeEscalation
+              must be set to `false`.
+        failureAction: Enforce

test/conformance/chainsaw/autogen/cel-preconditions/policy.yaml

@@ -0,0 +1,29 @@
+apiVersion: kyverno.io/v1
+kind: ClusterPolicy
+metadata:
+  name: disallow-privilege-escalation
+spec:
+  rules:
+    - name: privilege-escalation
+      match:
+        any:
+        - resources:
+            kinds:
+              - Pod
+            operations:
+              - CREATE
+              - UPDATE
+      celPreconditions:
+        - name: "Only for prod"  
+          expression: "has(object.metadata.labels) && has(object.metadata.labels.prod) && object.metadata.labels.prod == 'true'"
+      validate:
+        failureAction: Enforce
+        cel:
+          expressions:
+            - expression: >- 
+                object.spec.containers.all(container, has(container.securityContext) &&
+                has(container.securityContext.allowPrivilegeEscalation) &&
+                container.securityContext.allowPrivilegeEscalation == false)
+              message: >-
+                Privilege escalation is disallowed. The field
+                spec.containers[*].securityContext.allowPrivilegeEscalation must be set to `false`.