feat(eks): assess Kubernetes network policy enforcement in the Amazon VPC CNI add-on - #12661
feat(eks): assess Kubernetes network policy enforcement in the Amazon VPC CNI add-on#12661tamg-aws wants to merge 1 commit into
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Organization UI Review profile: ASSERTIVE Plan: Pro Plus Run ID: 📒 Files selected for processing (2)
Included review availability: Your plan provides up to 10 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe EKS service now collects Amazon VPC CNI add-on data. A new check evaluates ChangesEKS VPC CNI policy enforcement
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to The PR adds read-only assessment of managed EKS add-on configuration and conservatively reports unavailable or ambiguous settings for manual review. No actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant EKSService
participant EKSAPI as EKS API
participant NetworkPolicyCheck
participant CheckReport
EKSService->>EKSAPI: ListAddons and DescribeAddon
EKSAPI-->>EKSService: vpc-cni configuration
EKSService->>NetworkPolicyCheck: Provide collected clusters
NetworkPolicyCheck->>NetworkPolicyCheck: Evaluate enableNetworkPolicy
NetworkPolicyCheck->>CheckReport: Emit PASS, FAIL, or MANUAL
Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Description checkExplanation The description provides detailed context, behavior, limitations, verification results, and disclosures. It does not use all template headings and omits the explicit review steps, checklist, and license confirmation, but it is substantially complete and directly relevant. ✨ Finishing Touches🧪 Generate unit tests (beta)
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
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Actionable comments posted: 2
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Inline comments:
In
`@prowler/providers/aws/services/eks/eks_cluster_vpc_cni_network_policy_enforced/eks_cluster_vpc_cni_network_policy_enforced.py`:
- Line 31: Update the public function boolean_configuration_value by annotating
its value parameter as object, preserving its existing Optional[bool] return
annotation and behavior.
In `@prowler/providers/aws/services/eks/eks_service.py`:
- Line 148: Add a Google-style class docstring to EKSAddon describing the
collected add-on state, while leaving the model fields and behavior unchanged.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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prowler/changelog.d/eks-cluster-vpc-cni-network-policy.added.mdprowler/providers/aws/services/eks/eks_cluster_vpc_cni_network_policy_enforced/__init__.pyprowler/providers/aws/services/eks/eks_cluster_vpc_cni_network_policy_enforced/eks_cluster_vpc_cni_network_policy_enforced.metadata.jsonprowler/providers/aws/services/eks/eks_cluster_vpc_cni_network_policy_enforced/eks_cluster_vpc_cni_network_policy_enforced.pyprowler/providers/aws/services/eks/eks_service.pytests/providers/aws/services/eks/eks_cluster_vpc_cni_network_policy_enforced/eks_cluster_vpc_cni_network_policy_enforced_test.pytests/providers/aws/services/eks/eks_service_test.py
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… VPC CNI add-on Kubernetes NetworkPolicy objects are inert unless the CNI enforces them. On EKS with the Amazon VPC CNI, enforcement is off by default, so a cluster can carry a full set of NetworkPolicy manifests and still allow all pod-to-pod traffic, which is the failure mode this reports: policy that reads as applied and is not. The finding names the managed add-on setting it read, and states the two things it does not evaluate -- whether any NetworkPolicy exists, and whether a third-party CNI enforces them instead -- so the claim matches what was measured.
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One new check over the Amazon VPC CNI managed add-on, plus the add-on configuration the EKS collector
needs to read it.
What this asserts
eks_cluster_vpc_cni_network_policy_enforcedreports whether the Amazon VPC CNI managed add-on hasKubernetes network policy enforcement switched on. That is the precondition for any
NetworkPolicyresource to take effect through this enforcer: without it, policies can exist in the cluster and go
unenforced by the VPC CNI.
Every verdict is a statement about the managed add-on, not about the cluster. Two architectures live
outside the EKS API's view and neither is an edge case — a third-party policy engine, and a self-managed
VPC CNI. Both are covered in the disclosures below, and the shipped FAIL message names them, because an
operator reading a CSV row sees
status_extendedand nothing else.What it deliberately does not claim.
NetworkPolicyresources live in the cluster and are notexposed by the EKS API. This check asserts the precondition only, and the PASS message says so
explicitly rather than implying that pod-to-pod traffic is actually restricted.
Verdict semantics
enableNetworkPolicyto true.managed add-on does not enforce Kubernetes network policies, since it sets
enableNetworkPolicytofalse. Enforcement by a third-party policy engine or a self-managed VPC CNI is not visible to the EKS API
and is not evaluated." It deliberately does not say the cluster does not enforce network policies,
which would be simply false for a Calico cluster.
could not be listed; the cluster does not use the Amazon VPC CNI managed add-on, so the setting is
not visible from the EKS API at all and a self-managed CNI must be reviewed in-cluster; the add-on
configuration could not be read;
configurationValuesis not a readable JSON object; orenableNetworkPolicydoes not resolve to true or false — which includes the key being absententirely.
That last cause is the ordinary default install, so it is worth stating plainly rather than as an edge
case. The branch is
configuration.get(NETWORK_POLICY_KEY) is None, and.getreturnsNonefor anabsent key just as it does for an explicit null.
Addon.configurationValuesis documented at the pinnedbotocore as "the configuration values that you provided", and the add-on configuration schema declares
no default and no required member for
enableNetworkPolicy— so a managedvpc-cniadd-on installedwithout explicit configuration carries no such key and reports MANUAL, not PASS and not FAIL. A
reviewer asking "what does this check say about a cluster nobody has configured?" gets MANUAL, which is
the correct answer for an unobserved setting.
The boolean reader accepts both
"true"andtrue, because the add-on configuration schema typesthis field as a string carrying
"format": "boolean"— so the API returns the string — while theschema is add-on-version specific and the blob is otherwise untyped.
Verification
tests/providers/aws/services/eks/.eks_service.py.clean.
the values a healthy add-on returns.
Disclosures
A FAIL can be wrong about the cluster, in two documented architectures, and the shipped message says so.
This is the disclosure a maintainer most needs, because it bounds what the check is evidence of. Both were
verified against AWS documentation rather than reasoned about:
1. A third-party policy engine. The EKS Best Practices Guide has a section titled "ThirdParty Network
Policy Engines" recommending Calico and Cilium (
eks/latest/best-practices/network-security.html). Acluster enforcing through Calico correctly leaves
enableNetworkPolicyfalse, because you do not runtwo enforcers against the same traffic. So the FAIL is accurate about the add-on and wrong about the
cluster, and this is a recommended architecture rather than an oddity.
2. A self-managed VPC CNI. AWS documents three ways to switch the feature on
(
eks/latest/userguide/cni-network-policy-configure.html): the managed add-on,helm upgradewithenableNetworkPolicy=true, and editing theamazon-vpc-cniConfigMap to addenable-network-policy-controller: "true"alongside theaws-nodeDaemonSet argument. Only the first isreadable from the EKS API. The other two leave the setting in in-cluster state, so a cluster enforcing
that way also shows the add-on flag false — or has no managed add-on at all, which reports MANUAL.
Neither is fixable by reading more AWS API surface, and the verdict logic is deliberately unchanged.
The flag being explicitly false is a real measurement worth reporting; downgrading the FAIL to MANUAL
would trade away a true signal to fix what was a wording problem. Detecting Calico or Cilium is also
deliberately not attempted — any signal available from the EKS API would be a guess presented as a
measurement. The check's metadata
Notescarry both architectures and both citations, so the boundtravels with the check and not only with this PR.
MANUAL for a cluster with no managed add-on is a scope statement rather than a gap. Roughly the same
evidence would be needed to assess a self-managed CNI as to assess the
NetworkPolicyresourcesthemselves, and neither is reachable from the EKS API. Reporting FAIL there would assert a
misconfiguration never observed; reporting PASS would assert enforcement never observed. The message
directs the operator to review the in-cluster configuration.
codecov/projectwill be red, and does not gate. Measured across all 8 currently-open PRs in thiscampaign:
codecov/projectis FAILURE on 8 of 8 whilecodecov/patchis SUCCESS on 8 of 8. #12459merged with
codecov/projectred.codecov/patchis green here at 100.00%.Summary by CodeRabbit