Mtls Strict

✓ Guardrail Istio Guardrails Experimental Deployment And Infrastructure

istio.mtls-strict

Requires mesh-wide mutual TLS to be STRICT. A PeerAuthentication in the Istio root namespace must set mode STRICT, and no namespace or workload PeerAuthentication may downgrade to PERMISSIVE or DISABLE. PERMISSIVE accepts plaintext, so a workload without a sidecar (or an attacker on the pod network) can bypass mesh encryption.

mtls mutual tls peerauthentication strict encryption in transit zero trust

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Compatible Integrations

This guardrail works with the following integrations. Click to see how to use Mtls Strict with each collector.

Mtls Strict + Istio Collector Provides parsed Istio mesh config that these policies evaluate

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Enable This Guardrail

Add the parent policy to your lunar-config.yml to enable this guardrail.

📄 lunar-config.yml

policies:
  - uses: github://earthly/lunar-lib/policies/istio@v1.0.5
    include: [mtls-strict]
    # with: ...

How This Guardrail Works

This guardrail is part of the Istio Guardrails policy. It evaluates data collected by integrations and produces a pass/fail check with actionable feedback.

When enabled, this check runs automatically on every PR and in AI coding workflows, providing real-time enforcement of your engineering standards.

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↓ Integrations Gather Data

Collectors extract metadata from code, CI pipelines, tool outputs, and scans

{ } Centralized as JSON

All data merged into each component's unified metadata document

✓ This Guardrail Checks Current

Mtls Strict runs and provides pass/fail feedback

Configuration Options

These inputs can be configured in your lunar-config.yml to customize how the parent policy (and this guardrail) behaves.

Input	Required	Default	Description
`required_mtls_mode`	Optional	`STRICT`	Required mesh-wide mTLS mode for the mtls-strict check (STRICT or PERMISSIVE)

Istio Guardrails

This guardrail is part of the Istio Guardrails policy, which includes 7 guardrails for deployment and infrastructure.

View Policy

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