grafana: switch auth_proxy -> OAuth2 relying-party against authentik

The embedded outpost carries no provider token (token=None), so the
auth_proxy identity header was never set and no user could log in. RP
mode is topology-independent: challenge gate stays in front, login runs
inside Grafana via the OAuth2 code flow against auth.franksdank.cloud.

Provider 'grafana' (pk 9, confidential) created via ak shell; secret
written straight into the live .env (never in git). Auth URL uses the
global /application/o/authorize/ path — this fork resolves the provider
by client_id query param; per-slug authorize does not exist.
Caddyfile comment corrected: no identity header is forwarded to Grafana.

dankclaw/.env.example

@@ -20,11 +20,11 @@ WIREGUARD_PERSISTENT_KEEPALIVE_INTERVAL=25s
 # Gitea database
 GITEA_DB_PASSWORD=changeme
 
-# Grafana auth-proxy trust token. The outpost proxy provider 'grafana-proxy'
-# forwards authenticated traffic to Grafana with Authorization: Bearer
-# <client_id>_<client_secret>; the live .env must set this to that exact
-# concatenation (provider created via ak shell on authentik-server).
-GRAFANA_PROXY_TOKEN=changeme
+# Grafana OAuth2 client secret (authentik OAuth2Provider "grafana", pk 9).
+# Created via ak shell on authentik-server; the live .env must hold the
+# provider's generated client_secret verbatim. Rotation = rotate the provider
+# secret in authentik, restart grafana after updating the live .env value.
+GRAFANA_OAUTH_CLIENT_SECRET=changeme
 
 # Caddy (the homelab's single reverse proxy, on this host)
 # bcrypt hash (caddy hash-password). deploy.sh renders it into

dankclaw/Caddyfile

@@ -26,9 +26,9 @@
 # Authentik IdP itself (auth.franksdank.cloud — its login flow must never sit
 # behind a challenge) are exempt by construction: their vhosts never route
 # through Anubis. ComfyUI left this exempt set on 2026-08-31 and Grafana left
-# it on 2026-09-01 (auth_proxy mode; the outpost proxies authenticated traffic
-# through to it): both now sit behind the guard chain with their proxy
-# providers registered on the embedded outpost.
+# it on 2026-09-01 (OAuth2 relying-party mode against authentik): both now sit
+# behind the guard chain; Grafana authenticates users itself via the OAuth2
+# code flow, so no identity header is forwarded to it.
 # The pihole vhost keeps its basicauth edge; the hash placeholder below is
 # rendered by deploy.sh from CADDY_BASICAUTH_HASH (host .env, git-ignored) into
 # /home/dank/Containers/caddy/Caddyfile, which the container mounts.
@@ -133,10 +133,11 @@ gitea.franksdank.cloud {
 	reverse_proxy 192.168.0.143:3000
 }
 
-# --- Grafana (guarded: Anubis → Authentik; grafana-proxy provider, auth_proxy mode) ---
-# Authenticated traffic returns at the internal :8017 listener and is proxied
-# through by the outpost with Authorization: Bearer <client_id>_<client_secret>;
-# Grafana's auth.proxy trusts that token and auto-upserts a user per login.
+# --- Grafana (guarded: Anubis → Authentik outpost gate; login inside Grafana) ---
+# Auth model = OAuth2 relying party against authentik (OAuth2Provider "grafana",
+# confidential client). The guard chain gates unauthenticated traffic; the
+# outpost carries no provider token in this deployment, so identity headers
+# never reach Grafana — RP mode needs none and works regardless of topology.
 # The basicauth edge this replaces (CADDY_BASICAUTH_HASH) is retired.
 grafana.franksdank.cloud {
 	reverse_proxy anubis:8923 {

dankclaw/compose.yaml

@@ -177,14 +177,29 @@ services:
     user: "0:0"
     environment:
       GF_SERVER_ROOT_URL: "https://grafana.franksdank.cloud"
-      # Auth proxy mode: the authentik embedded outpost proxies authenticated
-      # traffic through with Authorization: Bearer <client_id>_<client_secret>
-      # (the grafana-proxy provider on the outpost). The token lives in the
-      # host .env (never committed); auto-upsert maps each authenticated
-      # authentik user to a Grafana user by email, default role Viewer.
-      GF_AUTH_PROXY_ENABLED: "true"
-      GF_AUTH_PROXY_HEADERS: "name Auth;logo https://grafana.franksdank.cloud/public/img/login-app-logo.png;auto-upsert"
-      GF_AUTH_PROXY_TOKEN: "${GRAFANA_PROXY_TOKEN}"
+      # Auth model = OAuth2 relying party against authentik (OAuth2Provider
+      # name "grafana", pk 9, confidential client_type, created via ak shell).
+      # Chosen over auth_proxy because the embedded outpost carries no provider
+      # token (token=None), so no identity header ever reaches Grafana — RP mode
+      # works regardless of outpost topology. The public vhost stays behind the
+      # Anubis challenge + outpost gate; login happens inside Grafana via the
+      # Authentik button. Users auto-upsert as Viewer (no role mapping yet);
+      # the local admin account remains the only Admin.
+      GF_AUTH_GENERIC_OAUTH_ENABLED: "true"
+      GF_AUTH_GENERIC_OAUTH_NAME: "Authentik"
+      GF_AUTH_GENERIC_OAUTH_CLIENT_ID: "grafana-21ca190cde75d60f"
+      GF_AUTH_GENERIC_OAUTH_CLIENT_SECRET: "${GRAFANA_OAUTH_CLIENT_SECRET}"
+      # Global authorize path: this fork resolves the provider by client_id
+      # query param — /application/o/<slug>/authorize/ does not exist here.
+      GF_AUTH_GENERIC_OAUTH_AUTH_URL: "https://auth.franksdank.cloud/application/o/authorize/"
+      GF_AUTH_GENERIC_OAUTH_TOKEN_URL: "https://auth.franksdank.cloud/application/o/token/"
+      # ?api=1 = introspection-style userinfo: returns all custom claims
+      # (entitlements/groups) for access tokens, not just the standard set.
+      GF_AUTH_GENERIC_OAUTH_API_URL: "https://auth.franksdank.cloud/application/o/userinfo/?api=1"
+      GF_AUTH_GENERIC_OAUTH_ALLOW_SIGN_UP: "false"
+      GF_AUTH_GENERIC_OAUTH_AUTO_UPSERT: "true"
+      GF_AUTH_GENERIC_OAUTH_ALLOW_ASSIGN_ORG: "true"
+      GF_AUTH_GENERIC_OAUTH_ORG_ID: "1"
     ports:
       - "3002:3000"
     volumes: