Add network policy for build-workflows - #1700
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe chart adds build-workflow namespaces, pod labels, and configurable egress NetworkPolicies. Installation scripts pass cluster CIDRs and create required namespaces. Render tests and documentation cover the new behavior. Quick-start provisioning and Gateway Operator documentation also change. ChangesBuild workflow isolation
Environment provisioning updates
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟠 High · up to The policy can still allow untrusted build code to contact unintended internal services because the default API and registry ranges are broad and an unconfigured registry selector permits namespace-wide access. This undermines the intended isolation boundary, so the PR should not merge until the defaults and selector requirements are tightened. Sequence Diagram(s)sequenceDiagram
participant InstallScript
participant Helm
participant Kubernetes
participant BuildWorkflowPod
InstallScript->>Kubernetes: Create workflows-default
InstallScript->>Helm: Pass node CIDR and policy settings
Helm->>Kubernetes: Render namespaces and NetworkPolicies
BuildWorkflowPod->>Kubernetes: Start with build-workflow labels
Kubernetes->>BuildWorkflowPod: Enforce configured egress rules
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✅ Passed checks (3 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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August 21, 2026 15:20
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Inline comments:
In
`@deployments/helm-charts/wso2-amp-platform-resources-extension/templates/build-workflow-networkpolicy.yaml`:
- Around line 1-7: Update
deployments/helm-charts/wso2-amp-platform-resources-extension/templates/build-workflow-networkpolicy.yaml:1-7
to accept a list of protected workflow namespaces and render one NetworkPolicy
per namespace, preserving the existing default namespace behavior. Update
documentation/docs/guides/_partials/_amp-installation.mdx:419-419 and
documentation/docs/guides/on-your-environment.mdx:1899-1899 to document the
supported multi-environment configuration and procedure.
- Around line 101-109: Restrict the in-cluster registry egress rule in
build-workflow-networkpolicy.yaml to registry pods by rendering the configured
registry podSelector alongside the namespaceSelector, requiring it when
registry.inCluster.namespace is set. Update tests/render.sh to assert that the
rendered rule includes the expected pod selector.
Apply the same fix in
`@deployments/helm-charts/wso2-amp-platform-resources-extension/values.yaml`
around lines 302 - 307: The render test must assert that the in-cluster registry
rule includes the expected pod selector.
In `@deployments/helm-charts/wso2-amp-platform-resources-extension/values.yaml`:
- Around line 286-301: Update the apiServer and registry cidr defaults in the
values configuration to empty lists instead of allowing all RFC1918 ranges.
Preserve the existing ports, and require deployment installers or operators to
explicitly supply the exact API-server and registry CIDRs.
In `@documentation/docs/guides/_partials/_amp-installation.mdx`:
- Around line 423-427: Update the apiServer CIDR comment and example near
networkPolicy.buildWorkflows.apiServer.cidrs to instruct users to convert the
API-server endpoint IP from kubectl output to a host CIDR using /32, or
substitute a verified control-plane subnet; do not imply that the raw endpoints
output is itself a subnet.
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deployments/helm-charts/wso2-amp-platform-resources-extension/templates/_helpers.tpldeployments/helm-charts/wso2-amp-platform-resources-extension/templates/build-workflow-namespace.yamldeployments/helm-charts/wso2-amp-platform-resources-extension/templates/build-workflow-networkpolicy.yamldeployments/helm-charts/wso2-amp-platform-resources-extension/templates/cluster-workflow-templates/ballerina-buildpack-build.yamldeployments/helm-charts/wso2-amp-platform-resources-extension/templates/cluster-workflow-templates/checkout-source.yamldeployments/helm-charts/wso2-amp-platform-resources-extension/templates/cluster-workflow-templates/dockefile-build.yamldeployments/helm-charts/wso2-amp-platform-resources-extension/templates/cluster-workflow-templates/gcp-buildpack-build.yamldeployments/helm-charts/wso2-amp-platform-resources-extension/templates/cluster-workflow-templates/publish-image.yamldeployments/helm-charts/wso2-amp-platform-resources-extension/tests/render.shdeployments/helm-charts/wso2-amp-platform-resources-extension/values.yamldeployments/quick-start/install-helpers.shdeployments/setup/setup-amp-extensions.shdocumentation/docs/guides/_partials/_amp-installation.mdxdocumentation/docs/guides/on-your-environment.mdx
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AnoshanJ
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August 21, 2026 15:38
AnoshanJ
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August 22, 2026 17:02
Argo applies templates[].metadata to the pod, unlike the ClusterWorkflow CR's own labels. generate-workload-cr is left unlabelled: it calls the OpenChoreo API and Thunder, and runs no user content. Signed-off-by: Anoshan Jayahanthan <101160077+AnoshanJ@users.noreply.github.com>
Build steps run code from the repository being built, and could reach every in-cluster service and the cloud metadata endpoint. Builds keep unrestricted internet egress on every port, IPv4 and IPv6 — base images, package registries and mirrors need it — and lose the private ranges. Re-allowed because builds cannot work without them: DNS, the API server (Argo's wait container reports step results there), and the registry, either on the node network or by Service DNS. All matched post-DNAT, so they name endpoint addresses and container ports; extraEgress covers anything else on a private address. The namespace is rendered behind a lookup guard, as the evaluation chart does, so the chart installs before OpenChoreo has run a workflow in it. Signed-off-by: Anoshan Jayahanthan <101160077+AnoshanJ@users.noreply.github.com>
Narrows the API-server and registry CIDRs to the k3d node network, which carries both, instead of the chart's RFC1918 default. Only passed when the subnet is derived, so a later --reuse-values upgrade cannot re-enable the policy with both rules emptied. The VM installer inherits this through install_platform_resources_extension. Also moves the workflows-default pre-creation ahead of the installs and behind one helper: two charts now place a NetworkPolicy there, and both rendering the Namespace would fail the loser with "invalid ownership metadata". Signed-off-by: Anoshan Jayahanthan <101160077+AnoshanJ@users.noreply.github.com>
Seventeen assertions, including that the pod labels still match the podSelector the policy depends on, that the internet rule stays portless and covers IPv6, and that an emptied CIDR drops its rule rather than rendering cidr: null. Signed-off-by: Anoshan Jayahanthan <101160077+AnoshanJ@users.noreply.github.com>
Signed-off-by: Anoshan Jayahanthan <101160077+AnoshanJ@users.noreply.github.com>
namespaces replaces the single namespace value, rendering one policy and one guarded Namespace per entry, so an install whose builds run in more than one workflow namespace does not leave the unnamed ones open. Empty still derives workflows-<environment.name>. The in-cluster registry rule also takes podLabels: a namespaceSelector on its own reaches every pod in the registry's namespace on the registry's port. Signed-off-by: Anoshan Jayahanthan <101160077+AnoshanJ@users.noreply.github.com>
Signed-off-by: Anoshan Jayahanthan <101160077+AnoshanJ@users.noreply.github.com>
The API-server endpoint is an address, not a subnet, so the example now shows /32. Drops the claim that each environment needs its own render, which did not hold: the workflow namespace tracks the workflow plane. Signed-off-by: Anoshan Jayahanthan <101160077+AnoshanJ@users.noreply.github.com>
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Purpose
Build workflows in
workflows-<env>had no NetworkPolicy covering any stage, so a build container could reach every cluster-internal service and the cloud metadata endpoint. Build steps execute code from the repository being built — aRUNline in a Dockerfile, asetup.py, an npm postinstall hook — so that reach belongs to whoever opened the pull request being built.Outbound internet access is a functional requirement for builds: base images, package registries, and mirrors all need it, and an allowlist of registries would break real builds. So this does not restrict the internet. It closes the private network instead, while re-allowing the three destinations builds genuinely need: cluster DNS, the kube-apiserver (Argo's
waitcontainer reports step results there), and the image registry. Anything else on a private address — a self-hosted Git server, an internal mirror, an egress proxy — goes inextraEgress, andenabled=falseturns the whole thing off.Build pods had no stable label to select, so the five untrusted stages (checkout, the three build variants, publish-image) now carry one.
generate-workload-cris deliberately left out: it runs no repository code and it is the step that legitimately calls the OpenChoreo API and Thunder.Verified on a live k3d cluster rather than by inspection: a full buildpack build succeeded through all four stages with the policy in force, and a probe pod wearing the build labels confirmed GitHub, PyPI, npm, ghcr.io and the Alpine CDN still reachable while Thunder, the registry ClusterIP, the OpenChoreo API and 169.254.169.254 are refused.
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Summary by CodeRabbit
New Features
Documentation