authentik: serve LDAP via an outpost behind the internal gateway

Adds the LDAP outpost deployment and routes ports 389 and 636 on
gateway-internal to it. 636 is a TLS listener in Terminate mode so
cert-manager renews the LDAPS certificate automatically, and both
listeners forward to the outpost's plaintext 3389.

allowedRoutes.kinds is set explicitly on both listeners: a TCP listener
permits no route kinds by default and a TLS listener defaults to
TLSRoute, so the TCPRoute would not attach otherwise.

applications/authentik/ldap/deployment.yaml

@@ -0,0 +1,46 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: authentik-ldap
+  namespace: authentik
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: authentik-ldap
+  template:
+    metadata:
+      labels:
+        app: authentik-ldap
+    spec:
+      containers:
+        - name: ldap
+          image: ghcr.io/goauthentik/ldap:2026.8.0
+          ports:
+            - containerPort: 3389
+              name: ldap
+            - containerPort: 6636
+              name: ldaps
+            - containerPort: 9300
+              name: metrics
+          envFrom:
+            - secretRef:
+                name: authentik-ldap-secrets
+          livenessProbe:
+            httpGet:
+              path: /outpost.goauthentik.io/ping
+              port: 9300
+            initialDelaySeconds: 10
+            periodSeconds: 30
+          readinessProbe:
+            httpGet:
+              path: /outpost.goauthentik.io/ping
+              port: 9300
+            initialDelaySeconds: 5
+            periodSeconds: 10
+          resources:
+            requests:
+              cpu: 50m
+              memory: 128Mi
+            limits:
+              memory: 256Mi

applications/authentik/ldap/infisicalsecret.yaml

@@ -0,0 +1,24 @@
+apiVersion: secrets.infisical.com/v1alpha1
+kind: InfisicalSecret
+metadata:
+  name: authentik-ldap-secrets
+  namespace: infisical
+spec:
+  hostAPI: https://infisical.jsme.be
+  resyncInterval: 30
+  authentication:
+    kubernetesAuth:
+      identityId: "5458def7-7c63-40d2-95da-41c614d0933a"
+      serviceAccountRef:
+        name: infisical-auth
+        namespace: infisical
+      autoCreateServiceAccountToken: true
+      secretsScope:
+        projectSlug: "kubernetes"
+        envSlug: "prod"
+        secretsPath: "/authentik/authentik-ldap"
+        recursive: false
+  managedSecretReference:
+    secretName: authentik-ldap-secrets
+    secretNamespace: authentik
+    secretType: Opaque

applications/authentik/ldap/service.yaml

@@ -0,0 +1,15 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: authentik-ldap
+  namespace: authentik
+spec:
+  selector:
+    app: authentik-ldap
+  ports:
+    - name: ldap
+      port: 3389
+      targetPort: 3389
+    - name: metrics
+      port: 9300
+      targetPort: 9300

applications/authentik/ldap/tcproute.yaml

@@ -0,0 +1,22 @@
+apiVersion: gateway.networking.k8s.io/v1alpha2
+kind: TCPRoute
+metadata:
+  name: authentik-ldap
+  namespace: authentik
+spec:
+  parentRefs:
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: gateway-internal
+      namespace: envoy-gateway
+      sectionName: authentik-ldap
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: gateway-internal
+      namespace: envoy-gateway
+      sectionName: authentik-ldaps
+  rules:
+    # The gateway terminates TLS on 636, so both listeners hit the plaintext port
+    - backendRefs:
+        - name: authentik-ldap
+          port: 3389

infra/envoy-gateway/authentik/authentik-ldap-certificate.yaml

@@ -0,0 +1,14 @@
+apiVersion: cert-manager.io/v1
+kind: Certificate
+metadata:
+  name: authentik-ldap-tls
+  namespace: envoy-gateway
+spec:
+  secretName: authentik-ldap-tls
+  privateKey:
+    rotationPolicy: Always
+  issuerRef:
+    name: azure-dns
+    kind: ClusterIssuer
+  dnsNames:
+    - ldap.jsme.be

infra/envoy-gateway/authentik/authentik-ldap-gateway-patch.yaml

@@ -0,0 +1,37 @@
+# TCP listeners for the authentik LDAP outpost. kinds must be set explicitly:
+# TCP allows nothing by default and TLS defaults to TLSRoute.
+- op: add
+  path: /spec/listeners/-
+  value:
+    name: authentik-ldap
+    protocol: TCP
+    port: 389
+    allowedRoutes:
+      kinds:
+        - kind: TCPRoute
+      namespaces:
+        from: Selector
+        selector:
+          matchLabels:
+            kubernetes.io/metadata.name: authentik
+- op: add
+  path: /spec/listeners/-
+  value:
+    name: authentik-ldaps
+    protocol: TLS
+    port: 636
+    # No hostname: LDAP clients cannot be relied on to send SNI
+    tls:
+      mode: Terminate
+      certificateRefs:
+        - kind: Secret
+          name: authentik-ldap-tls
+          namespace: envoy-gateway
+    allowedRoutes:
+      kinds:
+        - kind: TCPRoute
+      namespaces:
+        from: Selector
+        selector:
+          matchLabels:
+            kubernetes.io/metadata.name: authentik

infra/envoy-gateway/kustomization.yaml

@@ -23,6 +23,7 @@ resources:
 
   # Certificates
   - authentik/authentik-certificate.yaml
+  - authentik/authentik-ldap-certificate.yaml
   - argocd/argocd-certificate.yaml
   - bentopdf/bentopdf-certificate.yaml
   - gitea/gitea-certificate.yaml
@@ -70,6 +71,12 @@ patches:
       kind: Gateway
       name: gateway-internal
     path: authentik/authentik-gateway-patch.yaml
+  - target:
+      group: gateway.networking.k8s.io
+      version: v1
+      kind: Gateway
+      name: gateway-internal
+    path: authentik/authentik-ldap-gateway-patch.yaml
   - target:
       group: gateway.networking.k8s.io
       version: v1