jakman85andClaude Opus 4.8
5fb097d019
Add Headlamp (kubernetes-sigs/headlamp Helm chart) at headlamp.home.keithjackson.dev with native Keycloak OIDC login and PER-USER RBAC: Headlamp forwards each user's id_token to the k3s apiserver, so the existing oidc:* group bindings (platform-admins->cluster-admin, viewers->view) apply per user. The ServiceAccount is deliberately NOT bound to cluster-admin (clusterRoleBinding.create=false), since user requests ride the forwarded token. Key integration nuance: the apiserver is configured oidc-client-id=kubernetes, so it only accepts tokens whose aud contains `kubernetes`. The new `headlamp` Keycloak client carries an oidc-audience-mapper (included.client.audience= kubernetes) so tokens carry aud=[headlamp, kubernetes] -- accepted by both Headlamp's own verifier and the apiserver, leaving the apiserver config untouched. A groups mapper emits the `groups` claim the apiserver maps to RBAC. - platform/headlamp: namespace, HelmRepository/HelmRelease, SOPS OIDC secret (externalSecret envFrom), default-deny NetworkPolicy + Cilium ingress (gateway)/egress (apiserver+Keycloak) policies, README. Wired into platform/kustomization.yaml (platform tier). - platform/headlamp/httproute.yaml wired into platform-config (Gateway API CR, dependsOn platform), modeled on grafana-httproute. - keycloak-realm-import: add `headlamp` confidential client + groups/audience mappers + HEADLAMP_CLIENT_SECRET placeholder. Client also created LIVE via kcadm (realm import no-ops on the existing realm). - keycloak-realm-clients.sops: add headlamp-client-secret (mirrored into headlamp-oidc-credentials clientSecret). Both encrypted to the repo age key. Co-Authored-By: Claude Opus 4.8 <[email protected]>
88 lines
4.2 KiB
YAML
88 lines
4.2 KiB
YAML
---
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# Headlamp — the Kubernetes web dashboard, served at headlamp.home.keithjackson.dev with Keycloak
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# native-OIDC login and PER-USER RBAC (ADR-0014, docs/15). Official kubernetes-sigs/headlamp Helm
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# chart via a Flux HelmRelease (same pattern as platform/monitoring's kube-prometheus-stack).
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#
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# ── PER-USER RBAC (the whole point) ────────────────────────────────────────────────────────────
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# Headlamp is configured for OIDC, so its backend forwards the LOGGED-IN USER's OIDC id_token as the
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# bearer to the k3s API server. The apiserver validates that token (oidc-issuer-url = this realm,
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# oidc-client-id=kubernetes, oidc-username-claim=email, oidc-groups-claim=groups; see
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# infra/ansible roles/k3s_server) and RBAC is applied per user via the EXISTING group bindings
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# (platform/keycloak/k8s-oidc-rbac.yaml: oidc:platform-admins -> cluster-admin, oidc:viewers -> view).
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# So every user gets exactly their own rights — NOT a shared identity.
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#
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# clusterRoleBinding.create=false ← DELIBERATE. The default chart binds Headlamp's ServiceAccount
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# to cluster-admin; that would let the backend act as cluster-admin. We do NOT want that: user
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# requests ride the user's forwarded id_token, so the SA needs no cluster rights. Removing the
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# binding means an unauthenticated backend can do nothing — the secure posture for per-user RBAC.
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#
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# ── AUDIENCE NUANCE ─────────────────────────────────────────────────────────────────────────────
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# The apiserver only accepts ID tokens whose `aud` CONTAINS `kubernetes` (oidc-client-id=kubernetes).
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# A `headlamp` client would issue aud=[headlamp]. The Keycloak `headlamp` client therefore carries an
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# AUDIENCE protocol mapper that ADDS `kubernetes` to the token audience (keycloak-realm-import.yaml),
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# giving aud=[headlamp, kubernetes]: Headlamp's own verifier accepts it (aud contains headlamp) AND
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# the apiserver accepts it (aud contains kubernetes). This keeps the apiserver config untouched.
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apiVersion: helm.toolkit.fluxcd.io/v2
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kind: HelmRelease
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metadata:
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name: headlamp
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namespace: headlamp
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spec:
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interval: 30m
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chart:
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spec:
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chart: headlamp
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version: ">=0.40.0 <0.41.0" # Renovate maintains; chart appVersion pins the Headlamp image
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sourceRef:
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kind: HelmRepository
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name: headlamp
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namespace: headlamp
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install:
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remediation:
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retries: 3
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upgrade:
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remediation:
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retries: 3
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values:
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replicaCount: 1
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# In-cluster mode: Headlamp discovers the apiserver from the pod's in-cluster config, then
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# OVERRIDES the bearer with the user's OIDC id_token for authenticated requests.
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config:
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inCluster: true
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oidc:
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# OIDC config (clientID / clientSecret / issuerURL / scopes / callbackURL) is supplied via an
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# EXISTING SOPS-encrypted Secret consumed by name only (R-IDP-04) — the chart envFrom's it.
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# (The chart's `externalSecret` path reads OIDC_* env from this Secret; nothing sensitive is
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# rendered into the HelmRelease.)
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externalSecret:
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enabled: true
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name: headlamp-oidc
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hasScopes: true
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# PER-USER RBAC: do NOT grant Headlamp's ServiceAccount cluster-admin. User requests are
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# authorized by their forwarded OIDC token against the existing oidc:* group bindings.
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serviceAccount:
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create: true
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clusterRoleBinding:
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create: false
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# Hardened pod defaults from the chart (runAsNonRoot, uid 100). Kept explicit for clarity.
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securityContext:
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runAsNonRoot: true
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runAsUser: 100
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runAsGroup: 101
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privileged: false
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allowPrivilegeEscalation: false
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capabilities:
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drop:
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- ALL
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# NOTE: readOnlyRootFilesystem intentionally left unset (chart default). Enabling it needs a
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# writable /tmp (+ plugins dir) emptyDir; deferred as a runtime-verified follow-up hardening.
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resources:
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requests:
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cpu: 50m
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memory: 128Mi
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limits:
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memory: 256Mi
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service:
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type: ClusterIP
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port: 80
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