44 lines
1.8 KiB
YAML
44 lines
1.8 KiB
YAML
# Make Traefik trust the X-Forwarded-* headers that the host nginx sets.
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#
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# Without this, Traefik rewrites every forwarded header from its own connection,
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# which is plain HTTP on port 80. The application then sees scheme=http even
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# though the browser connected over TLS. See docs/two-hop-proxy-header-contract.md.
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#
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# k3s installs Traefik through its bundled HelmChart, so values are overridden
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# with a HelmChartConfig rather than by editing the deployment. k3s reconciles
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# the chart and recreates the Traefik pod.
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#
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# kubectl apply -f deploy/lab/k8s/traefik-forwarded-headers.yaml
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# kubectl -n kube-system rollout status deploy/traefik --timeout=180s
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apiVersion: helm.cattle.io/v1
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kind: HelmChartConfig
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metadata:
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name: traefik
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namespace: kube-system
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spec:
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valuesContent: |-
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ports:
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web:
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forwardedHeaders:
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# Requests arriving from these sources keep their existing
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# X-Forwarded-* values instead of having them rewritten.
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#
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# 10.42.0.0/16 is the pod CIDR. It is required because the traefik
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# Service uses externalTrafficPolicy: Cluster, so svclb SNATs the
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# traffic and Traefik sees a pod-network address rather than the
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# host nginx address.
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#
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# The node/host range is deliberately absent. Because svclb SNATs,
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# the host nginx address never reaches Traefik — measured, not assumed.
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# Trusting a range that cannot appear only widens the surface.
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#
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# Trusting the whole pod CIDR still means any pod in the cluster could
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# forge these headers, which is why echo-network-policy.yaml restricts
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# who may reach the application at all.
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trustedIPs:
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- 10.42.0.0/16
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websecure:
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forwardedHeaders:
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trustedIPs:
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- 10.42.0.0/16
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