Authentik SSO + homepage naked domain
Auth layer (Authentik 2026.8.0): - compose: 3-service stack (authentik-postgres, authentik-server, authentik-worker), postgres health-gated, bind mounts under /home/dank/authentik - Caddyfile: auth.franksdank.cloud vhost; forward_auth on the no-auth vhosts (homepage, SearXNG, Hermes, Prometheus, RomM, Copyparty); outpost path proxied first in a route block - .env.example: AUTHENTIK_PG_PASS + AUTHENTIK_SECRET_KEY - deploy.sh: render only CADDY_BASICAUTH_HASH (the homepage per-user hashes are retired; grafana + pihole keep basicauth) - tests/authentik.bats (new) + updated homepage/caddyfile/pihole seams - docs: Authentik.md + per-service pages; Caddy.md + Homepage.md updated Homepage (naked domain): - Caddyfile: dankclaw.franksdank.cloud -> franksdank.cloud www.franksdank.cloud; dankclaw + dankserver redirect to it; bare-IP catch-all updated - addn-hosts: A records for the naked domain, www, and auth (all -> 143) - tests/pihole.bats: vhost_names handles multi-address blocks; TLD check allows the naked domain All 146 tests pass.
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# Authentik — the homelab's SSO / OIDC provider
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Authentik is the single sign-on (SSO) and OpenID Connect (OIDC) provider for the
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homelab. It fronts the Caddy vhosts that do not carry their own
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application-level authentication. Apps that have their own login (Grafana,
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Gitea, OpenWebUI, Jellyfin, the *arr stack, Pi-hole) are not wrapped in
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forward_auth — they handle their own session.
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- **Version:** `2026.8.0` (pinned in `dankclaw/compose.yaml`)
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- **Host:** dankclaw (`192.168.0.143`)
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- **Name:** `auth.franksdank.cloud`
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- **Stack:** 3 compose services — `authentik-postgres`, `authentik-server`,
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`authentik-worker` (see [Pi-hole](Pi-hole.md) for the LAN-DNS pattern)
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## Why Authentik
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The comparison that chose it (against Authelia, Keycloak, Zitadel, Ory) is in
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`.docaudit/research/auth.md`. In short: full OIDC with single-logout, a web GUI
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for all configuration, a native Caddy `forward_auth` outpost, and a footprint
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that fits on a 3-user homelab (~1–1.5 GB idle). Redis was removed in 2025.10,
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so the stack is 3 services, not 4.
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## Architecture
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```mermaid
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graph LR
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subgraph Browser
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U[User]
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end
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subgraph Caddy [Caddy - auth gate]
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FA[forward_auth]
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end
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subgraph AK [Authentik]
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SRV[server :9000]
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WKR[worker]
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PG[(postgres)]
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OUT[outpost /auth/caddy]
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end
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subgraph App [Target app]
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A1[SearXNG / Hermes / Prometheus<br/>RomM / Copyparty / homepage]
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end
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U -->|1. GET /| FA
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FA -->|2. GET /outpost.../auth/caddy| OUT
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OUT -->|3. no session: 302 login| U
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U -->|4. login at auth.franksdank.cloud| SRV
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SRV --> PG
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WKR --> PG
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SRV -->|5. 2xx: session valid| FA
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FA -->|6. proxy with headers| A1
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```
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1. The browser hits a protected vhost (e.g. `search.franksdank.cloud`).
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2. Caddy `forward_auth` clones the request to the Authentik outpost
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(`/outpost.goauthentik.io/auth/caddy`).
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3. With no valid session, the outpost returns a `302` to the Authentik login
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page (`auth.franksdank.cloud`).
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4. The user logs in at Authentik (email + password, TOTP/WebAuthn MFA, or an
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upstream provider).
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5. On the next request the outpost returns `2xx`; Caddy copies the
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`X-Authentik-*` headers and proxies to the app.
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## The three compose services
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| Service | Role | Image |
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|---|---|---|
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| `authentik-postgres` | PostgreSQL 16 (users, flows, sessions, events) | `docker.io/library/postgres:16-alpine` |
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| `authentik-server` | Core + admin API + the embedded Caddy outpost (port 9000) | `ghcr.io/goauthentik/server:2026.8.0` |
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| `authentik-worker` | Background tasks (event processing, provider sync, flows) | `ghcr.io/goauthentik/server:2026.8.0` |
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- **Postgres** is the only stateful store. Sessions, caching, and WebSockets
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moved to PostgreSQL in 2025.10 (Redis removed).
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- **Server** and **worker** run the same image; the `command` selects the role
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(`server` / `worker`).
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- The worker runs as `0:0` (rootless: container root maps to the host user that
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owns the data dir).
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- Data persists under `/home/dank/authentik/` (bind mounts, repo policy — no
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named volumes).
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## Caddy integration
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The Caddyfile wraps the no-auth vhosts in a `route` block. The pattern (one
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example; the others are identical):
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```caddyfile
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search.franksdank.cloud {
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route {
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# 1. The outpost path is proxied to Authentik (login UI + session).
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reverse_proxy /outpost.goauthentik.io/* authentik-server:9000
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# 2. forward_auth checks the session before serving the app.
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forward_auth authentik-server:9000 {
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uri /outpost.goauthentik.io/auth/caddy
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copy_headers X-Authentik-Username X-Authentik-Groups X-Authentik-Email X-Authentik-Name
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trusted_proxies private_ranges
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}
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# 3. The app.
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reverse_proxy 192.168.0.143:8081
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}
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}
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```
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Vhosts protected by forward_auth: the homepage (`franksdank.cloud`,
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`www.franksdank.cloud`), SearXNG, Hermes, Prometheus, RomM, Copyparty. The
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`auth.franksdank.cloud` vhost proxies to the server directly (no forward_auth —
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it *is* the login).
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## Configuration (secrets)
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Two secrets live in the host `.env` (git-ignored; placeholders in
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`.env.example`):
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- `AUTHENTIK_PG_PASS` — the PostgreSQL password. Generate: `openssl rand -base64 32`.
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- `AUTHENTIK_SECRET_KEY` — the server's signing key. Generate: `openssl rand -base64 48`.
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## First-time setup
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1. `./scripts/deploy.sh dankclaw` — pulls, starts the 3 services (postgres
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health-gated), reloads Caddy.
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2. Open `https://auth.franksdank.cloud` — the initial setup wizard runs. It
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creates the superuser (email + password) and generates the DB schema.
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3. In the admin interface: **Directory → Applications** → add a **Proxy**
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application (or an **OAuth2/OpenID Connect** provider) for each vhost you
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protect. The Caddy outpost reads the application's policy.
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4. For apps with native OIDC (Grafana, Gitea, OpenWebUI): add an **OAuth2/OpenID
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Connect** provider, create the app with the correct redirect URI, and paste
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the `client_id` / `client_secret` into the app's SSO settings.
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## Operations
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- **Health:** `https://auth.franksdank.cloud/-/health/` (the server healthcheck
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probes this).
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- **Logs:** `podman logs authentik-server` / `podman logs authentik-worker`.
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- **Backups:** `pg_dump` the `authentik-postgres` database (the single source of
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truth). The `/home/dank/authentik/` dir holds media + static files.
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- **Upgrades:** bump the image tag in `dankclaw/compose.yaml`, run
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`./scripts/deploy.sh dankclaw`. Authentik migrates the schema on startup.
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## Failure modes
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| Symptom | Cause | Fix |
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|---|---|---|
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| Every vhost 502s at the outpost | `authentik-server` down | `podman logs authentik-server`; check postgres health |
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| Login loops (302 → login → 302) | `trusted_proxies` / `X-Forwarded-*` mismatch | Confirm Caddy sets `X-Forwarded-For`; the outpost trusts `private_ranges` |
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| "Invalid signature" on the outpost | `AUTHENTIK_SECRET_KEY` differs between server and worker | Both services read the same `.env` var; re-deploy |
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| Postgres "password authentication failed" | `AUTHENTIK_PG_PASS` changed after first init | Reset via `pg_ctl` or re-init the data dir |
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## Cross-references
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- [Caddy](Caddy.md) — the reverse proxy that carries the forward_auth directives
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- [Pi-hole](Pi-hole.md) — the LAN DNS that resolves `auth.franksdank.cloud`
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- [Network Architecture](../Architecture/Network%20Architecture.md) — the flat naming scheme
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- Research: `.docaudit/research/auth.md` — the full provider comparison
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