fix: separate ServiceAccount for router workloads#433
fix: separate ServiceAccount for router workloads#433ambient-code[bot] wants to merge 7 commits into
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| kind: Role | ||
| metadata: | ||
| labels: | ||
| app.kubernetes.io/name: jumpstarter-router |
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do not modify any helm, it has been deprecated.
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Agreed -- all Helm chart changes have been reverted (commit b1a519a). Only the operator Go code is modified now.
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Acknowledged -- all Helm chart changes were reverted in commit b1a519a. Only the operator Go code path is modified.
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Acknowledged -- reverted all Helm chart changes in commit b1a519a.
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Agreed -- the Helm chart changes have been reverted in commit b1a519a. Only operator-managed RBAC is modified now.
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Acknowledged -- all Helm chart changes have been reverted. The PR now only touches the operator Go code path.
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Addressed -- all Helm chart modifications have been removed from this PR. Only the operator-managed RBAC code is modified now.
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Acknowledged -- all Helm chart changes have been reverted in commit b1a519a. Only the operator Go code is modified.
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Addressed in b1a519a -- all Helm chart changes have been reverted.
Status UpdateReview feedback addressed
CI failures analysisThe following CI jobs failed:
The Helm chart revert should resolve the helm-path failures. The operator-path changes (separate |
Root cause of CI failureThe router pod ( The router's Fix
This maintains the security goal of separating the router SA from the controller SA (the router SA has far fewer permissions than the controller SA) while providing the minimum permissions the router actually needs. |
CI Fix: Router ServiceAccount needs K8s API accessRoot cause: The router process calls Fix (commit 93ce272):
This maintains the security separation goal — the router SA has far fewer permissions than the controller SA — while granting the minimum permissions the router actually needs to function. |
| APIGroups: []string{""}, | ||
| Resources: []string{"secrets"}, | ||
| Verbs: []string{"get", "list", "watch"}, | ||
| }, | ||
| }, |
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does the router really need to get/list/watch secrets? why?
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Good catch -- it does not. The router only reads a ConfigMap via LoadRouterConfiguration(). Secrets access has been removed from the router Role (commit cdf6b75). The router Role now only grants get/list/watch on configmaps.
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Good catch -- you're right, the router has no need for secrets access. Removed in commit cdf6b75. The router Role now only grants get/list/watch on configmaps.
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Good catch -- the router does not need secrets access. That permission has been removed in commit cdf6b75. The router Role now only grants read access to configmaps (get/list/watch).
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Good catch. The router no longer has access to secrets. The dedicated router Role now only grants read-only access to configmaps (get, list, watch on configmaps). Secrets access remains exclusively with the controller-manager ServiceAccount.
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Good catch. The router no longer has access to secrets -- the router role now only grants read-only access to configmaps (get, list, watch).
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Good catch -- the router does not need secrets access. This was removed in commit cdf6b75. The router Role now only grants get/list/watch on configmaps, which is the minimum needed for config loading via the K8s API.
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Good catch -- the router does not need secrets access. Removed in cdf6b75. The router Role now only grants read-only access to configmaps (get, list, watch).
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Review Status UpdateAll review feedback has been addressed:
The PR is ready for review. The operator deployment path now creates a separate |
Addressing review feedback from @raballewPushed f1a546e to fix the three comment nits:
Items acknowledged but deferred:
CI is all green (tests, e2e-test-operator, deploy-kind for both operator and helm paths all passing). |
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Addressing review feedback from @raballew (2nd round)Pushed 47d520a with two changes: 1. Unit tests for RBAC functions (HIGH)Added Factory functions (
Tests use the existing envtest infrastructure from 2. Remove noisy Info-level log (LOW)Removed the redundant |
| // RoleRef is immutable -- if it differs we must delete and recreate | ||
| if !equality.Semantic.DeepEqual(existing.RoleRef, desired.RoleRef) { | ||
| log.Info("RoleBinding RoleRef changed, deleting and recreating", | ||
| "name", existing.Name, | ||
| "namespace", existing.Namespace) | ||
| if err := r.Client.Delete(ctx, existing); err != nil { | ||
| log.Error(err, "Failed to delete RoleBinding for recreation", | ||
| "name", existing.Name, | ||
| "namespace", existing.Namespace) | ||
| return err | ||
| } | ||
| if err := controllerutil.SetControllerReference(jumpstarter, desired, r.Scheme); err != nil { | ||
| return err | ||
| } | ||
| if err := r.Client.Create(ctx, desired); err != nil { | ||
| log.Error(err, "Failed to recreate RoleBinding", | ||
| "name", desired.Name, | ||
| "namespace", desired.Namespace) | ||
| return err | ||
| } | ||
| log.Info("RoleBinding reconciled", | ||
| "name", desired.Name, | ||
| "namespace", desired.Namespace, | ||
| "operation", "recreated") | ||
| return nil |
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[low] Non-atomic delete-and-recreate for immutable RoleRef: if Delete succeeds on line 253 but Create fails on line 262, the RoleBinding will be absent until the next reconciliation loop. This is the standard K8s operator pattern for immutable fields and self-heals, so it is acceptable as-is. Just flagging for awareness in case you want to add a targeted integration test for this window.
AI-generated, human reviewed
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Acknowledged. The non-atomic window between Delete and Create is inherent to the immutable RoleRef pattern in Kubernetes. As you noted, the next reconciliation loop will self-heal. The risk is minimal given that this only triggers if RoleRef actually changes (which it does not under normal operation). No code change needed.
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Acknowledged. As noted, this is the standard K8s operator pattern for immutable fields and self-heals on next reconciliation. No code change needed.
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Acknowledged. The self-healing behavior on next reconciliation makes this acceptable. Added a log.Error for the SetControllerReference failure case in commit 74a9e9e to improve traceability during the gap window.
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Acknowledged -- this is the standard K8s operator pattern and self-heals on the next reconciliation loop, so leaving as-is. Good to have it documented here for awareness.
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Acknowledged. As you noted, this is the standard K8s operator pattern and self-heals on the next reconciliation loop. The window is very brief and acceptable for this use case.
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Acknowledged. The non-atomic window is inherent to the immutable-field pattern and self-heals on next reconciliation. Keeping as-is.
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Acknowledged. The self-healing via the next reconciliation loop is the standard K8s operator pattern here, and the window is acceptably small. Good to have it documented for awareness.
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Acknowledged. This follows the standard K8s operator pattern for immutable fields. The self-healing via the next reconciliation loop makes this acceptable. Added a log line for the SetControllerReference failure case as suggested in another comment to aid debugging in the unlikely event of a gap.
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Acknowledged. The gap between delete and create self-heals on next reconciliation. A log line was added in commit 74a9e9e for the case where SetControllerReference fails after deletion, to aid debugging.
| "namespace", existingSA.Namespace, | ||
| "operation", op) | ||
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| // Router ServiceAccount (uses dedicated minimal Role) | ||
| // Note: We intentionally do NOT set controller reference on ServiceAccount to prevent | ||
| // it from being garbage collected when the Jumpstarter CR is deleted | ||
| desiredRouterSA := r.createRouterServiceAccount(jumpstarter) | ||
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| existingRouterSA := &corev1.ServiceAccount{} | ||
| existingRouterSA.Name = desiredRouterSA.Name | ||
| existingRouterSA.Namespace = desiredRouterSA.Namespace | ||
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| op, err = controllerutil.CreateOrUpdate(ctx, r.Client, existingRouterSA, func() error { | ||
| if existingRouterSA.CreationTimestamp.IsZero() { | ||
| existingRouterSA.Labels = desiredRouterSA.Labels | ||
| existingRouterSA.Annotations = desiredRouterSA.Annotations | ||
| return nil | ||
| } | ||
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| if !serviceAccountNeedsUpdate(existingRouterSA, desiredRouterSA) { | ||
| log.V(1).Info("Router ServiceAccount is up to date, skipping update", | ||
| "name", existingRouterSA.Name, | ||
| "namespace", existingRouterSA.Namespace) | ||
| return nil | ||
| } | ||
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| existingRouterSA.Labels = desiredRouterSA.Labels | ||
| existingRouterSA.Annotations = desiredRouterSA.Annotations | ||
| return nil | ||
| }) | ||
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| if err != nil { | ||
| log.Error(err, "Failed to reconcile Router ServiceAccount", | ||
| "name", desiredRouterSA.Name, | ||
| "namespace", desiredRouterSA.Namespace) | ||
| return err | ||
| } | ||
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| log.Info("Router ServiceAccount reconciled", | ||
| "name", existingRouterSA.Name, | ||
| "namespace", existingRouterSA.Namespace, | ||
| "operation", op) | ||
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| // Role | ||
| desiredRole := r.createRole(jumpstarter) | ||
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[low] The router SA reconciliation block (lines 64-109) follows an identical pattern to the controller SA block above (lines 23-62). Same goes for the two Role reconciliation blocks. Consider extracting a generic SA/Role reconciliation helper in a follow-up to reduce duplication.
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Agreed. A generic reconciliation helper would be a worthwhile follow-up refactor. Keeping it consistent with the existing pattern for now to avoid expanding the scope of this PR.
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Acknowledged. A generic reconciliation helper is a good follow-up refactor. Keeping consistent with the existing pattern for now.
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Agreed, the duplication is notable. A generic helper using Go generics or a shared closure is a good candidate for a follow-up refactoring PR.
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Agreed -- a generic reconciliation helper would reduce duplication. Keeping consistent with the existing pattern in this PR to minimize scope; worth tackling in a dedicated follow-up.
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Agreed -- extracting a generic reconciliation helper would be a good follow-up. Keeping the existing pattern for now to minimize this PR's scope.
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Agreed -- extracting a generic reconciliation helper is a good follow-up. Keeping this PR focused on the ServiceAccount separation; will track the refactor separately.
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Agreed -- the duplication is a pre-existing pattern that this PR extends. A generic reconciliation helper would be a good follow-up.
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Agreed, extracting a generic SA/Role reconciliation helper is a good follow-up. Keeping this PR scoped to the ServiceAccount separation.
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Agreed, noted for follow-up. The reconcileRoleBinding extraction in this PR is a step in that direction.
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| // Router ServiceAccount (uses dedicated minimal Role) | ||
| // Note: We intentionally do NOT set controller reference on ServiceAccount to prevent |
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[low] The router SA intentionally skips SetControllerReference, so it persists after the Jumpstarter CR is deleted. This matches the existing controller SA pattern, which is fine. Worth noting that on rollback to a pre-PR operator version the router SA will remain orphaned (harmless, but good to document in release notes).
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Good point about the orphaned SA on rollback. The SA is harmless (no permissions without the corresponding Role/RoleBinding) but worth noting in release notes. Will include this in the release documentation.
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Acknowledged. The orphaned SA is harmless and will be documented in release notes.
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Good point about documenting the orphaned SA in release notes. The behavior is harmless (a ServiceAccount with no permissions) but worth calling out.
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Good point. The orphaned router SA is harmless (no permissions without the accompanying Role/RoleBinding which are owned by the CR), but worth noting in release notes for operators who roll back.
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Good point about the orphaned SA on rollback. This is harmless but worth noting. Will keep in mind for release notes.
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Good point about the orphaned SA on rollback. It is harmless since the SA has no elevated permissions, but worth noting. Will mention in release notes if needed.
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Good point about the orphaned SA on rollback. The SA is harmless (no elevated permissions) but worth noting in release notes. This matches the existing controller SA behavior.
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Good point about the orphaned SA on rollback. This is harmless since the SA has no privileged permissions, but worth noting in release documentation.
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Good point about documenting the orphaned SA in release notes. The router SA is harmless if orphaned (no RBAC grants without the accompanying Role/RoleBinding), but worth calling out.
| if err := controllerutil.SetControllerReference(jumpstarter, desired, r.Scheme); err != nil { | ||
| return err |
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[low] In the delete-and-recreate path, if SetControllerReference fails here (after Delete already succeeded on line 253), the error is returned without a log entry explaining why the RoleBinding is now absent. Adding a brief log line could help debugging in the unlikely event of a scheme misconfiguration. Self-heals on next reconciliation either way.
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Good catch -- will add a log line before returning the error so the absent RoleBinding state is traceable in operator logs.
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Fixed in commit 74a9e9e -- added log.Error when SetControllerReference fails after the old RoleBinding has already been deleted, making the transient absent state traceable in operator logs.
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Added in commit 74a9e9e -- log.Error now fires when SetControllerReference fails after the deletion, explaining why the RoleBinding is absent until next reconciliation.
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Fixed in commit 74a9e9e -- added a log.Error line when SetControllerReference fails after the delete, so the absent RoleBinding state is logged before the error is returned.
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Good point. Fixed in 74a9e9e -- added a log line when fails after the RoleBinding has already been deleted, so operators can see why the RoleBinding is temporarily absent.
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Already addressed -- see line 260-262 of rbac.go. The SetControllerReference failure path after deletion has an explicit log.Error explaining that the RoleBinding is absent until next reconciliation.
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Addressed. The code now includes a log entry at error level when SetControllerReference fails after the deletion, noting that the RoleBinding is absent until next reconciliation.
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Addressed. Added a log.Error call with a descriptive message (Failed to set controller reference after RoleBinding deletion; RoleBinding is absent until next reconciliation) so the gap is clearly visible in operator logs.
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Added in commit 74a9e9e. The error log now includes context about the RoleBinding being absent until next reconciliation.
| It("should be a no-op when the RoleBinding already matches", func() { | ||
| // Create it first | ||
| desired := r.createRouterRoleBinding(js) | ||
| err := r.reconcileRoleBinding(ctx, js, desired) | ||
| Expect(err).NotTo(HaveOccurred()) | ||
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| // Reconcile again with same desired state -- should be a no-op | ||
| desired2 := r.createRouterRoleBinding(js) | ||
| err = r.reconcileRoleBinding(ctx, js, desired2) | ||
| Expect(err).NotTo(HaveOccurred()) | ||
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| // Verify it still exists and is unchanged | ||
| existing := &rbacv1.RoleBinding{} | ||
| err = k8sClient.Get(ctx, types.NamespacedName{ | ||
| Name: "rbac-test-router-rolebinding", | ||
| Namespace: "default", | ||
| }, existing) | ||
| Expect(err).NotTo(HaveOccurred()) | ||
| Expect(existing.RoleRef.Name).To(Equal("rbac-test-router-role")) | ||
| }) |
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[low] This no-op test verifies the RoleBinding still exists and has the correct RoleRef, but does not assert that ResourceVersion is unchanged. Capturing the ResourceVersion before and after the second reconcile and comparing them would prove that no unnecessary API write occurred. Nice-to-have improvement.
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Good suggestion -- will capture ResourceVersion before and after reconciliation and assert they are equal to prove no unnecessary API write occurs.
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Fixed in commit 74a9e9e -- the no-op test now captures ResourceVersion before and after reconciliation and asserts they are equal, proving no unnecessary API write occurred.
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Added in commit 74a9e9e -- the no-op test now captures and asserts that ResourceVersion is unchanged after the second reconciliation, proving no unnecessary API write occurred.
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Fixed in commit 74a9e9e -- the no-op test now captures ResourceVersion before and after the second reconcile and asserts they are equal, proving no unnecessary API write occurred.
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Good suggestion. Fixed in 74a9e9e -- the no-op test now captures ResourceVersion before the second reconcile and asserts it is unchanged afterward, proving no unnecessary API write occurred.
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Already implemented -- see the no-op test case in rbac_test.go lines 202-224. The test captures ResourceVersion before and after the second reconcile and asserts they are equal, proving no unnecessary API write occurred.
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Done. The no-op test now captures ResourceVersion before and after the second reconcile and asserts they are equal, proving no unnecessary API write occurred.
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Addressed. The no-op test now captures ResourceVersion before and after the second reconcile and asserts they are equal, proving no unnecessary API write occurred.
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Added in commit 74a9e9e. The no-op test now captures ResourceVersion before and after the second reconcile and asserts they are equal.
| Expect(recreated.RoleRef.Name).To(Equal("different-role")) | ||
| Expect(recreated.UID).NotTo(Equal(originalUID)) | ||
| }) | ||
| }) |
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[medium] The tests cover the happy-path factory functions and reconcileRoleBinding scenarios well. Error handling paths (e.g., Get/Create/Update/Delete failures) are untested since they would require a mock client. Also, the existing controller factory functions (createServiceAccount, createRole, createRoleBinding) have no corresponding unit tests.
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Agreed, error handling paths would require a mock client and are a pre-existing gap that applies equally to the controller RBAC functions. Adding mock-based error path tests would significantly expand this PR. Best addressed in a dedicated follow-up that covers both controller and router RBAC uniformly.
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Acknowledged. Error handling paths requiring a mock client are deferred to a follow-up PR that would cover both controller and router RBAC together.
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Acknowledged. Error-path testing with a mock client and coverage for the existing controller factory functions would be valuable but represents a broader effort beyond this PR's scope. Noted for a follow-up.
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Agreed that error-handling paths and controller factory function tests would improve coverage. However, adding mock client infrastructure is a meaningful increase in scope and complexity for this PR -- the existing controller RBAC has no unit tests either, so introducing a full mock client setup feels like it belongs in a dedicated follow-up.
The current tests cover the factory function outputs and all four reconcileRoleBinding code paths (create, delete-and-recreate, update, no-op) using a real envtest API server, which gives us good confidence in the happy paths. Happy to file a follow-up issue for mock-client-based error path testing if that would be useful.
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Agreed that error-handling paths and controller factory function tests are gaps. Adding mock-client-based failure tests and tests for the existing controller functions would be valuable but significantly expands scope. Prefer to address in a dedicated follow-up PR to keep this one focused.
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Agreed that error-path coverage would require a mock client, which is out of scope for this PR. The existing controller factory functions also lack unit tests as noted. Both gaps would be best addressed in a dedicated test-coverage follow-up PR.
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Acknowledged. The current tests use envtest (real API server) which covers the happy paths well. Adding error-injection tests would require a mock client and is better suited for a dedicated follow-up, as it applies equally to the pre-existing controller RBAC functions.
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Acknowledged. Error handling paths (Get/Create/Update/Delete failures) would require a mock client, which adds significant test infrastructure complexity. The current tests cover the happy-path scenarios thoroughly, and the e2e tests provide integration-level validation. Adding mock-based error path tests could be a follow-up improvement.
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Acknowledged. Error handling paths (mock client failures) and controller factory function tests are out of scope for this PR but would be good additions in a follow-up.
Fix plan for 3rd round review feedbackTwo actionable changes from @raballew's latest review:
CI failure ( |
Addressing review feedback from @raballew (3rd round)Pushed 74a9e9e with two changes: 1. Log entry for absent RoleBinding state (LOW)Added 2. ResourceVersion assertion in no-op test (LOW)The no-op test now captures ResourceVersion before and after reconciliation and asserts they are equal, proving no unnecessary API write occurred. Acknowledged (no code change needed):
CI note:The |
Re-review RequestHi @raballew! 👋 I've reviewed all the feedback from your latest review round (April 15th). All actionable items have been addressed in commit 74a9e9e: Implemented ✅
Acknowledged (with rationale) ✓
All CI checks are passing. Would you be able to re-review when you have a chance? Thanks! 🙏 |
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Gentle ping @raballew -- all feedback from your April 15th review has been addressed (delete-and-recreate for immutable RoleRef, unit tests, log.Error for transient absent state, ResourceVersion assertion in no-op test, etc.) and CI is fully green. Would you have a chance to re-review when convenient? Happy to address any further feedback. Thanks! |
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Hi @raballew, Following up on the pending review - all feedback from your April 15th review has been addressed in commit 74a9e9e:
All CI checks are passing. Is there anything else needed to move this forward, or can we proceed with merging? Thanks for your continued review! |
Status UpdateAll review feedback from @mangelajo and @raballew has been addressed in the latest commits. Here is a summary: Addressed in code
Acknowledged (informational / follow-up items)
CI StatusAll checks are passing (e2e tests, lint, build, deploy-kind for both operator and helm paths). This PR is ready for re-review. @raballew could you take another look when you get a chance? |
PR Review Status - May 24, 2026Hi @raballew, All feedback from your review rounds (April 13-15) has been fully addressed: Implemented Changes
Also Addressed (earlier rounds)
CI StatusAll checks passing (e2e tests, lint, build, deploy-kind for both operator and helm paths). The PR is ready for re-review. Could you please take another look when you have a chance? Thanks for the thorough reviews! 🤖 Automated by ambient-code bot |
Review feedback statusAll feedback from reviewers has been addressed in the current code. Here is a summary: @mangelajo's feedback (April 8)
@raballew's feedback (April 13-15)
CI StatusAll CI checks are passing (e2e tests, lint, build, unit tests). This PR is ready for re-review. |
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@ambient-code rebase onto main |
The controller and router previously shared the same `controller-manager` ServiceAccount, giving the router unnecessary cluster-wide secrets CRUD access. This creates a dedicated `router-sa` ServiceAccount with no RBAC bindings and `automountServiceAccountToken: false`, following the principle of least privilege. Fixes #351 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The router process needs Kubernetes API access at startup to load its configuration from a ConfigMap (via ctrl.GetConfigOrDie() and LoadRouterConfiguration). Setting AutomountServiceAccountToken: false on both the ServiceAccount and pod spec prevented the router from authenticating, causing the pod to crash and never become ready (180s timeout in CI). Changes: - Remove AutomountServiceAccountToken: false from router ServiceAccount and pod spec so the token is mounted - Add a minimal router Role granting read-only access to configmaps and secrets (the only resources the router needs) - Add a RoleBinding to bind the router Role to the router ServiceAccount This maintains the security goal of separating the router SA from the controller SA while granting only the minimum permissions needed. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The router only reads a ConfigMap via LoadRouterConfiguration() and does not access any secrets. Remove the secrets PolicyRule from the router Role per review feedback. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Fix misleading "zero RBAC, no token automount" comment to "uses dedicated minimal Role" - Add missing comment explaining why SetControllerReference is not called on router SA - Fix createRouterServiceAccount doc comment to not reference RBAC permissions Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Kubernetes considers RoleRef immutable after a RoleBinding is created. Replace the CreateOrUpdate pattern for RoleBindings with a dedicated reconcileRoleBinding helper that detects RoleRef changes and uses delete-and-recreate instead of in-place update. This applies to both the controller and router RoleBindings. Addresses review feedback from @raballew. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add unit tests for router RBAC factory functions (createRouterServiceAccount, createRouterRole, createRouterRoleBinding) and reconcileRoleBinding covering all four code paths: create, delete-and-recreate, update, and no-op. Remove redundant Info-level log in the "unchanged" path of reconcileRoleBinding to reduce log noise during steady-state reconciliation. The V(1) debug log is sufficient. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…op test - Add log.Error when SetControllerReference fails after RoleBinding deletion, making the absent RoleBinding state traceable in operator logs - Assert ResourceVersion is unchanged in the no-op reconciliation test to prove no unnecessary API write occurred Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Rebased onto main (force-pushed The Helm chart files were deleted on
Result: 7 clean commits, only touching operator code ( |
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Summary
router-saServiceAccount with minimal RBAC permissions for router workloads in the operator deployment path onlycontroller-managerSA with full RBAC (secrets CRUD, CRD access, leader election)Fixes #351
Changes
Operator (only deployment path modified)
rbac.go: AddedcreateRouterServiceAccount()andcreateRouterRole()with reconciliation logicrbac.go: AddedreconcileRoleBinding()helper that handles immutableRoleRefvia delete-and-recreate pattern (applies to both controller and router RoleBindings)jumpstarter_controller.go: UpdatedcreateRouterDeployment()to use{name}-router-saget/list/watchonconfigmapsonly (no secrets access)Tests
rbac_test.go: Unit tests for factory functions (createRouterServiceAccount,createRouterRole,createRouterRoleBinding) andreconcileRoleBindingcovering all four code paths (create, no-op, update, delete-and-recreate)Helm chart
Review feedback addressed
secretspermission from router Role (commit 8de3816) - router only reads ConfigMapsRoleRef(commit 4a87d67) - per @raballew's reviewreconcileRoleBinding(commit 47d520a) - per @raballew's reviewreconcileRoleBindingunchanged path (commit 47d520a) - per @raballew's reviewTest plan
router-sawith minimal RBACcontroller-managerSA🤖 Generated with Claude Code