kitestacks-homelab/docs/authentik-sso-setup.md

KiteStacks Authentik SSO Setup

Established: 2026-06-08
Author: kenpat
Status: In Progress — all providers/apps configured, Cloudflare tunnel updates pending

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Architecture

All services sit behind Cloudflare Tunnels on the kitestacks Docker network.
cloudflared routes external traffic directly to each service container by hostname.
Authentik (authentik:9000) is the single identity provider.

Internet → Cloudflare → cloudflared → [service container]
                                          ↕
                                 Authentik auth check

Two integration patterns are used:

Pattern	How it works	Services
Native OIDC/OAuth2	App calls Authentik directly for login	Grafana, OpenWebUI, Forgejo, OpenProject, Kavita
Authentik Proxy Provider	Cloudflare tunnel → Authentik (embedded outpost) → service	Shaarli, Uptime Kuma, LiteLLM

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SSO Status

Service	Subdomain	Port	Method	Status
Authentik	auth.kitestacks.com		(is the IdP)	✅ Running
Grafana	grafana.kitestacks.com		OAuth2	✅ Configured
Kite AI (OpenWebUI)	ai.kitestacks.com		OIDC	✅ Configured
Forgejo	gitforge.kitestacks.com		OAuth2	✅ Configured
BookStack	—	—	—	🚫 Retired — books hosted on Kavita
OpenProject	tasks.kitestacks.com		OIDC	✅ Configured, upgraded v13→v15
Kavita	kavita.kitestacks.com		OIDC	✅ Configured, secret filled
Shaarli	links.kitestacks.com		Proxy	⚠️ Provider configured, CF tunnel update pending
Uptime Kuma	status.kitestacks.com		Proxy	⚠️ Provider configured, CF tunnel update pending
LiteLLM	llm.kitestacks.com		Proxy	⚠️ Provider configured, CF tunnel update pending
Portainer	portainer.kitestacks.com		—	🚫 SSO excluded
Prometheus	prometheus.kitestacks.com		—	🚫 SSO excluded
Node Exporter	node-exporter.kitestacks.com		—	🚫 SSO excluded
OpenRouter	openrouter.ai	—	—	🚫 external, excluded

*BookStack has been retired. All books are hosted on Kavita (kavita.kitestacks.com).

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Files Changed (2026-06-08)

File	What changed
apps/authentik/docker-compose.yml	Added kitestacks network declaration, AUTHENTIK_ERROR_REPORTING__ENABLED: false
apps/kavita/config/appsettings.json	OpenIdConnectSettings.Enabled → true, Authority set
apps/bookstack/docker-compose.yml	OIDC env vars added, kitestacks network added, APP_URL updated
apps/bookstack/.env	Created with BOOKSTACK_OIDC_SECRET placeholder
apps/openproject/docker-compose.yml	OIDC env vars added, kitestacks network declared
apps/openproject/.env	Created with OPENPROJECT_OIDC_SECRET placeholder

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Step 1 — Authentik Admin UI: Create Providers and Applications

Go to https://auth.kitestacks.com → Admin Interface.

For each native OIDC service, create one OAuth2/OpenID Provider:

General settings (all providers):

• Signing Key: select the default RS256 key
• Token validity: 10 minutes (access), 30 days (refresh)

1. Grafana

• Providers → Create → OAuth2/OpenID Provider
  • Name: Grafana
  • Client type: Confidential
  • Client ID: grafana
  • Redirect URIs: https://grafana.kitestacks.com/login/generic_oauth
  • Scopes: openid, email, profile
• Applications → Create
  • Name: Grafana, Slug: grafana
  • Provider: Grafana (above)
• Copy the Client Secret → put it in /home/kenpat/docker/grafana/.env:

  GRAFANA_OAUTH_CLIENT_SECRET=<paste_secret>
  

• Restart: cd ~/docker/grafana && docker compose up -d

2. Kite AI (Open WebUI)

• Providers → Create → OAuth2/OpenID Provider
  • Name: Open WebUI, Client ID: open-webui
  • Redirect URIs: https://ai.kitestacks.com/oauth/oidc/callback
  • Scopes: openid, email, profile
• Applications → Create: Name: Kite AI, Slug: open-webui
• Copy secret → /home/kenpat/docker/kite-ai/.env:

  OPENWEBUI_OAUTH_CLIENT_SECRET=<paste_secret>
  

• Restart: cd ~/docker/kite-ai && docker compose up -d

3. Kavita

• Providers → Create → OAuth2/OpenID Provider
  • Name: Kavita, Client ID: kavita
  • Redirect URIs: https://kavita.kitestacks.com/api/Account/OIDCCallback
  • Scopes: openid, email, profile
• Applications → Create: Name: Kavita, Slug: kavita
• Copy secret → /home/kenpat/docker/kavita/config/appsettings.json:

  "Secret": "<paste_secret>"
  

• Restart: cd ~/docker/kavita && docker compose restart (if a compose exists) or docker restart kavita

4. OpenProject

• Providers → Create → OAuth2/OpenID Provider
  • Name: OpenProject, Client ID: openproject
  • Redirect URIs: https://tasks.kitestacks.com/auth/oidc/callback
  • Scopes: openid, email, profile
• Applications → Create: Name: OpenProject, Slug: openproject
• Copy secret → /home/kenpat/docker/openproject/.env:

  OPENPROJECT_OIDC_SECRET=<paste_secret>
  

• Restart: cd ~/docker/openproject && docker compose up -d
  • Note: Container is currently running openproject/community:13 but compose specifies openproject/openproject:15. Recreation will upgrade it. Verify data migration after restart. The Cloudflare tunnel for tasks.kitestacks.com may need updating from openproject:8080 → openproject:80 after the upgrade.

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For proxy services, create Proxy Providers:

These services have no native OIDC. Authentik will act as the reverse proxy.

After creating each Proxy Provider + Application, add all three to the Embedded Outpost: Outposts → authentik Embedded Outpost → Edit → move all three proxy applications to "Selected Applications".

6. Shaarli

• Providers → Create → Proxy Provider
  • Name: Shaarli
  • Mode: Reverse Proxy
  • External host: https://links.kitestacks.com
  • Internal host: http://shaarli:<port>
  • Internal host SSL validation: off
• Applications → Create: Name: Shaarli, Slug: shaarli
• Cloudflare Tunnel: Change links.kitestacks.com route from http://shaarli:<port> → http://authentik:<port>

7. Uptime Kuma

• Providers → Create → Proxy Provider
  • Name: Uptime Kuma
  • Mode: Reverse Proxy
  • External host: https://status.kitestacks.com
  • Internal host: http://uptime-kuma:<port>
• Applications → Create: Name: Uptime Kuma, Slug: uptime-kuma
• Cloudflare Tunnel: Change status.kitestacks.com route from http://uptime-kuma:<port> → http://authentik:<port>

8. LiteLLM (when ready to expose publicly)

• Providers → Create → Proxy Provider
  • Name: LiteLLM
  • Mode: Reverse Proxy
  • External host: https://llm.kitestacks.com
  • Internal host: http://kite-litellm:<port>
• Applications → Create: Name: LiteLLM, Slug: litellm
• Cloudflare Tunnel: Add route llm.kitestacks.com → http://authentik:<port>

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Step 2 — Forgejo: Add Authentik OAuth2 Source

Forgejo stores OAuth sources in its database (not in app.ini), so this requires the Forgejo admin UI.

1. Go to https://gitforge.kitestacks.com → Site Administration → Authentication Sources
2. Click Add Authentication Source
3. Settings:
   • Authentication Type: OAuth2
   • Authentication Name: authentik
   • OAuth2 Provider: OpenID Connect
   • Client ID: forgejo
   • Client Secret: (create an Authentik app first — see below)
   • OpenID Connect Auto Discovery URL: https://auth.kitestacks.com/application/o/forgejo/.well-known/openid-configuration
   • Additional scopes: email profile
4. Save

Create the Authentik app for Forgejo first:

• Provider: OAuth2/OpenID, Client ID: forgejo
• Redirect URI: https://gitforge.kitestacks.com/user/oauth2/authentik/callback
• Application slug: forgejo

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Step 3 — Cloudflare Tunnel Updates

In the Cloudflare Zero Trust Dashboard → Networks → Tunnels → your tunnel → Configure → Public Hostnames:

Hostname	Change From	Change To
links.kitestacks.com	http://shaarli:<port>	http://authentik:<port>
status.kitestacks.com	http://uptime-kuma:<port>	http://authentik:<port>
llm.kitestacks.com	(new)	http://authentik:<port>
tasks.kitestacks.com	http://openproject:<port>	http://openproject:<port> (after OpenProject upgrade)

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Step 4 — Restart Containers After Config Changes

After filling in all secrets in the .env files:

cd ~/docker/grafana        && docker compose up -d
cd ~/docker/kite-ai        && docker compose up -d
cd ~/docker/bookstack      && docker compose up -d
cd ~/docker/openproject    && docker compose up -d
cd ~/docker/authentik      && docker compose up -d
docker restart kavita

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Troubleshooting

OIDC redirect loop / 400 error

• Check that the Redirect URI in the Authentik provider exactly matches what the app sends.
• Grafana: https://grafana.kitestacks.com/login/generic_oauth (no trailing slash)

Kavita "OIDC is not configured" message

• The appsettings.json change requires a container restart: docker restart kavita
• Verify Enabled: true and Secret is not empty.

BookStack redirects to http://<MONK_LAN_IP>:<port>

• APP_URL must be updated to the real HTTPS domain and the container recreated.

OpenProject: OIDC provider not visible in login

• Env var format is version-specific. If env vars don't work in v15, configure via: Administration → Authentication → OpenID Connect Providers → Add

Proxy services (Shaarli/Uptime Kuma) show Authentik login but then 502

• Verify the Embedded Outpost has the proxy providers assigned.
• Verify internal host is reachable: docker exec authentik curl -v http://shaarli:<port>

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Service-to-Container Name Reference

Subdomain	Container Name	Internal Port
auth.kitestacks.com	authentik
grafana.kitestacks.com	grafana
ai.kitestacks.com	kite-openwebui
gitforge.kitestacks.com	forgejo
tasks.kitestacks.com	openproject	80 (after upgrade)
kavita.kitestacks.com	kavita
links.kitestacks.com	shaarli
status.kitestacks.com	uptime-kuma
llm.kitestacks.com	kite-litellm
www.kitestacks.com	homepage
portainer.kitestacks.com	portainer	9000 (excluded)
prometheus.kitestacks.com	prometheus	9090 (excluded)
node-exporter.kitestacks.com	node-exporter	9100 (excluded)