feat(ingress-nginx): bump to 1.11.5 and restrict the admission webhook - #3798
feat(ingress-nginx): bump to 1.11.5 and restrict the admission webhook#3798Andrei Kvapil (kvaps) wants to merge 4 commits into
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…pace The sidecar was still referenced from an individual maintainer's namespace while the controller beside it, built from the same repository and pinned to the same version, already came from the project's. The repository moved to the cozystack organisation some time ago; the image reference did not follow. Same image: the digest is unchanged, and v1.11.2 is kept so the sidecar stays aligned with the controller, whose tag tracks the upstream ingress-nginx version. Assisted-By: Claude Signed-off-by: Andrei Kvapil <kvapss@gmail.com>
The controller image is a cozystack rebuild that adds the protobuf exporter, so the chart must not drift ahead of the tags published under ghcr.io/cozystack/ingress-nginx-with-protobuf-exporter. Pin the chart version in the Makefile: helm pull carried no --version and would otherwise fetch whatever is latest upstream. The v1.11.2 image already carried a backport of the upstream security patches, but it reports itself as a plain v1.11.2 build, which makes it indistinguishable from an unpatched build for anyone scanning by version string. Moving to a stock v1.11.5 removes that ambiguity. The protobuf-exporter sidecar is bumped in lockstep so the two stay on the same upstream version. Assisted-By: Claude Signed-off-by: Andrei Kvapil <andrei.kvapil@aenix.io>
The admission webhook is only ever called by the API server, but it was reachable from every pod in the cluster, in any namespace. That is avoidable attack surface: any flaw in the webhook becomes exploitable by any workload, which is what separated CVE-2025-1974 from an ordinary webhook bug. The rule is deny-only and disables default-deny. Any Cilium rule with an ingress section otherwise puts the selected endpoints behind a default-deny, which here would mean enumerating every port the controller serves and breaking traffic on the first one missed. Host-network sources are not Cilium endpoints, so a management cluster's API server is unaffected. Tenant clusters need an explicit carve-out instead: Kamaji places the API server outside the cluster and defines only the "cluster" egress selection, so webhook calls arrive from the konnectivity agent pod rather than from the API server address, and denying it would fail every Ingress create/update in the tenant cluster. Assisted-By: Claude Signed-off-by: Andrei Kvapil <andrei.kvapil@aenix.io>
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe ingress-nginx chart is upgraded to 4.11.5. The update refreshes images, templates, CI values, Helm tests, documentation, and admission webhook network policy configuration. ChangesIngress-nginx chart update
Retag comment cleanup
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to The version and webhook-policy changes are merge-ready after normal checks and review; no actionable merge-blocking risk remains. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In
`@packages/system/ingress-nginx/templates/admission-webhook-networkpolicy.yaml`:
- Around line 51-62: Update the fromEndpoints selector in the admission webhook
NetworkPolicy so the konnectivity-agent exemption applies only within the
kube-system namespace; require namespace kube-system for allowed endpoints and
retain the k8s-app=konnectivity-agent constraint. Add or update a test covering
rejection of matching labels outside kube-system and non-matching labels within
kube-system.
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hack/promote-retag.shpackages/system/ingress-nginx/Makefilepackages/system/ingress-nginx/charts/ingress-nginx/Chart.yamlpackages/system/ingress-nginx/charts/ingress-nginx/OWNERSpackages/system/ingress-nginx/charts/ingress-nginx/README.mdpackages/system/ingress-nginx/charts/ingress-nginx/README.md.gotmplpackages/system/ingress-nginx/charts/ingress-nginx/ci/admission-webhooks-cert-manager-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-admission-tls-cert-manager-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-configmap-addheaders-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-configmap-proxyheaders-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-configmap-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-custom-ingressclass-flags.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-daemonset-extra-modules-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-daemonset-metrics-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-daemonset-opentelemetry-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-daemonset-podannotations-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-daemonset-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-deployment-extra-modules-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-deployment-metrics-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-deployment-opentelemetry-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-deployment-podannotations-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-deployment-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-hpa-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-ingressclass-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-service-internal-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/controller-service-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/daemonset-customconfig-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/daemonset-customnodeport-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/daemonset-extra-modules.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/daemonset-headers-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/daemonset-nodeport-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/daemonset-tcp-udp-configMapNamespace-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/daemonset-tcp-udp-portNamePrefix-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/daemonset-tcp-udp-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/daemonset-tcp-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/deamonset-metrics-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/deployment-autoscaling-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/deployment-extra-modules-default-container-sec-context.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/deployment-extra-modules-specific-container-sec-context.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/deployment-extra-modules.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/deployment-headers-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/deployment-internal-lb-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/deployment-nodeport-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/deployment-tcp-udp-configMapNamespace-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/deployment-tcp-udp-portNamePrefix-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/deployment-tcp-udp-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/deployment-tcp-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/deployment-webhook-extraEnvs-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/ci/deployment-webhook-resources-values.yamlpackages/system/ingress-nginx/charts/ingress-nginx/templates/_helpers.tplpackages/system/ingress-nginx/charts/ingress-nginx/templates/admission-webhooks/validating-webhook.yamlpackages/system/ingress-nginx/charts/ingress-nginx/templates/controller-prometheusrule.yamlpackages/system/ingress-nginx/charts/ingress-nginx/templates/controller-service-webhook.yamlpackages/system/ingress-nginx/charts/ingress-nginx/templates/controller-servicemonitor.yamlpackages/system/ingress-nginx/charts/ingress-nginx/templates/default-backend-deployment.yamlpackages/system/ingress-nginx/charts/ingress-nginx/templates/default-backend-poddisruptionbudget.yamlpackages/system/ingress-nginx/charts/ingress-nginx/templates/default-backend-servi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myasnikovdaniil
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Blocker is the k8s-app: konnectivity-agent carve-out. k8s-app is ordinary pod label, any workload sets it on itself, and with enableDefaultDeny.ingress: false and no ingress section, falling out of that deny is whole access decision. So any pod in any namespace reaches webhook port by putting that label on itself, which is what policy is meant to stop. Nothing in repo constrains pod labels by admission, and label really is identity-relevant in cilium 1.19.5 (pkg/labelsfilter/filter.go has no default whitelist), so it is not filtered out.
Namespace key is not forgeable. Splitting the deny in two would keep the carve-out and close this: one entry for k8s:io.kubernetes.pod.namespace NotIn [kube-system] with no label condition, one for namespace In [kube-system] with current NotIn on k8s-app. Then only agent in kube-system is exempt.
I checked kamaji at pinned 26.3.6-edge and label is right, internal/resources/konnectivity/agent.go sets k8s-app: konnectivity-agent and nothing else on pod template, so carve-out matches what you intended.
I only looked at 4 non-vendored files, not the chart refresh.
| - matchExpressions: | ||
| - key: k8s:io.kubernetes.pod.namespace | ||
| operator: Exists | ||
| - key: k8s-app |
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k8s-app is ordinary pod label, any workload can set it. With enableDefaultDeny.ingress: false above, falling out of this deny is the whole access decision, so a pod in any namespace gets to webhook port just by labelling itself k8s-app: konnectivity-agent. Namespace key is not forgeable, so two deny entries instead of one would fix it - namespace NotIn [kube-system] with no label condition, and namespace In [kube-system] with this NotIn kept.
| - port: {{ $webhookPort | quote }} | ||
| protocol: TCP | ||
| - fromEntities: | ||
| - world |
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This may deny apiserver itself. In cilium 1.19.5 an out-of-cluster apiserver CIDR identity can carry both reserved:kube-apiserver and reserved:world, resolveLabels() in pkg/ipcache/metadata.go leaves HasKubeAPIServerLabel() out of isInCluster and then adds world, and appendAPIServerLabelsForDeletion guards on exactly that pair. Deny wins over allow, so no fromEntities: [kube-apiserver] allow could rescue it later.
Both topologies we ship are carved out anyway (in-cluster apiserver is host network, external control plane comes through worker nodes without original source IP), so nothing is broken today. But webhook Service is ClusterIP with no override, so I am not sure what this rule buys against that risk. Read from source, i did not test on cluster.
The admission-webhook deny exempted any endpoint carrying k8s-app: konnectivity-agent, in any namespace. Because the rule disables default-deny, falling out of the deny is the entire access decision — so any pod anywhere could reach the webhook port by labelling itself, which is precisely the access the policy exists to remove. k8s-app is an ordinary pod label a workload sets on itself. Nothing in the platform constrains pod labels by admission, and Cilium keeps k8s-app identity-relevant (its label filter ships no default whitelist), so the forged label really does change the endpoint's identity rather than being filtered out. The namespace key is derived by Cilium from the pod's actual namespace and cannot be set by the workload. Splitting the deny in two keeps the carve-out and closes the hole: one selector for everything outside kube-system with no label condition at all, one for kube-system carrying the existing NotIn. Only the agent in its own namespace is exempt. Kamaji at the pinned 26.3.6-edge puts nothing but k8s-app: konnectivity-agent on the agent pod template (internal/resources/konnectivity/agent.go), so the label remains the only available discriminator and the namespace confinement is what makes it safe to key on. Tests cover both halves: the outside-kube-system selector must carry no label condition, and the kube-system selector must keep exactly the namespace and label pair. Reported-by: Daniil Myasnikov <myasnikovdaniil2001@gmail.com> Assisted-By: Claude Signed-off-by: Andrei Kvapil <andrei.kvapil@aenix.io>
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Applied exactly as you proposed — the deny is now two selectors that OR together: everything outside You're right that this was the whole access decision rather than a hardening detail. With I re-checked the three things the fix rests on rather than taking them on faith. Nothing in the platform constrains pod labels by admission, so the label is freely settable. Cilium keeps Tests cover both halves, since the interesting property here is an absence: the outside- CodeRabbit flagged the same thing independently on this file, which is a fair signal it was findable rather than exotic. Good catch before it shipped. One thing from your last line stays open: the chart refresh really is unreviewed. The vendored |
What this PR does
Bumps ingress-nginx to chart 4.11.5 / controller v1.11.5, and closes the admission webhook to everything except the API server.
Version bump
The shipped
v1.11.2controller is a cozystack rebuild that already carries a backport of the CVE-2025-1974 fix (v0.28.2, March 2025), so this is not a fix for a live vulnerability. The problem is that it reports itself as a plainv1.11.2 build git-d3bb2b4: the binary is built from the upstream 1.11.2 tag with the patch applied on top, which does not change the version ldflags, and the image labels are inherited from theregistry.k8s.iobase layer. A patched build is therefore indistinguishable from an unpatched one by anything except its digest, and anything scanning by version string flags it. This bump removes that ambiguity.packages/system/ingress-nginxfeeds three consumers — the platform ingress, tenant Ingress applications (extra/ingress), and the ingress addon of tenant Kubernetes clusters — so one bump covers all three. The protobuf-exporter sidecar moves in lockstep, since its tag tracks the upstream controller version.CHART_VERSIONis now pinned in the package Makefile.helm pullcarried no--version, somake updatewould have fetched whatever is latest upstream (4.13.9 today) against a controller image that only exists for selected versions.Admission webhook policy
The webhook is only ever called by the API server, but it was reachable from every pod in the cluster, in any namespace — avoidable attack surface independent of any specific CVE.
The new
CiliumNetworkPolicyis deny-only and disables default-deny. A Cilium rule carrying an ingress section otherwise puts the selected endpoints behind a default-deny, which here would mean enumerating every port the controller serves (80, 443, metrics, the exporter, tcp/udp services) and breaking traffic on the first one missed. Subtracting one port is the safer construction.Two callers are deliberately not denied:
clusteregress selection), so the call arrives from the agent pod inkube-system, not from the API server address. AfromEntities: [kube-apiserver]allow would not match it, and every Ingress create/update in every tenant cluster would start failing.The policy is namespaced rather than clusterwide on purpose: the same package is installed into several namespaces of one cluster, so a cluster-scoped object with a fixed name would collide between releases. It can be disabled with
admissionWebhookPolicy.enabled.Verification
Tested on a live Kamaji tenant cluster (k8s 1.35.6, Cilium 1.19), with the addon enabled for the test and disabled afterwards:
defaultopenConnection timed outAlso confirmed on the management cluster that
kube-apiserverruns as static pods on the host network, so the host-network carve-out holds there.The package previously ran no unit tests at all; a
testtarget is added with 7 assertions covering the policy. It is scoped with--with-subchart=falsebecause the vendored chart carries upstream's own suites, which assert upstream defaults and fail under our values. The fullhack/helm-unit-tests.shsweep is green.The controller and exporter images are rebuilt by cozystack/ingress-nginx-with-protobuf-exporter#5, which vendors the
11843.diffpatch instead of fetching it from a still-open upstream PR at build time.Screenshots
Not applicable — no UI changes.
Downstream repositories
Walked the trigger map in
docs/agents/contributing.mdagainst the diff, which touchespackages/system/ingress-nginx/and one comment line inhack/promote-retag.sh:apps//extra/; no platform component added or removed; no change topackages/core/platform/values.yaml, variants, bundles or release assets. Thepackage Makefilestrigger was considered because ofCHART_VERSIONand the newtesttarget:CHART_VERSIONdoes not change the documented contract ofmake update, andtest: helm unittestis an existing pattern in the repo (packages/system/cilium-networkpolicy/Makefile), not new tooling.packages/apps/,values.schema.json, version enums orApplicationDefinition; none apply to a system package.hack/package.mkandhack/common-envs.mkuntouched; nothing underhack/moved or renamed, and the edit tohack/promote-retag.shis a comment with no behaviour change; layout and namespaces unchanged.Release note
Summary by CodeRabbit
New Features
Updates
Bug Fixes