# OIDC / Single Sign-On ## What OIDC gives you OpenID Connect (OIDC) lets users log in with an existing identity provider — Google, Authentik, Keycloak, or any OIDC-compatible IdP — instead of a local email/password. On first SSO login, a TREK account is created automatically using the email from the provider. ## User flow 1. Click **"Sign in with SSO"** on the login page. 2. You are redirected to your identity provider's login page. 3. Authenticate and grant consent. 4. The provider redirects back to TREK at `GET /api/auth/oidc/callback`. If this is your first login, an account is created automatically (subject to registration settings). 5. The server issues a short-lived one-time code and redirects your browser to `/login?oidc_code=`. The frontend immediately exchanges that code at `GET /api/auth/oidc/exchange?code=` to obtain the session. 6. Your `trek_session` cookie is set and you land on the dashboard. **Remember me.** The Remember-me switch on the login page is carried into SSO as a query flag on the login URL: `GET /api/auth/oidc/login?remember=1` (or `remember=0`), appended with `&` when an invite token is already present. Only `0` and `1` are accepted; any other value — and starting SSO from the register tab, where the switch is not shown — is treated as if the parameter were absent. The choice is held in the server-side login state, survives the provider round-trip and the one-time-code exchange, and decides both the session lifetime and the cookie lifetime: | `remember` | Session lifetime | `trek_session` cookie | |---|---|---| | `1` | `SESSION_DURATION_REMEMBER` (default `30d`) | persistent, `maxAge` matches | | `0` | `SESSION_DURATION` (default `24h`) | browser-session cookie, cleared when the browser closes | | omitted | `SESSION_DURATION` (default `24h`) | persistent, `maxAge` matches | If SSO sessions are dying at browser close, the login link is sending `remember=0`. ## Prerequisites Set the following environment variables before starting the server: | Variable | Required | Description | |---|---|---| | `APP_URL` | Yes | Base URL of your TREK instance (e.g. `https://trek.example.com`). Used to build the redirect URI. **Env var only — not configurable via the admin panel.** If it is unset (or not a parseable URL, in which case it is ignored), TREK falls back to the first `ALLOWED_ORIGINS` entry, and only if that one is missing or unparseable to `http://localhost:{PORT}` — which produces a redirect URI your IdP will reject. A scheme-less `ALLOWED_ORIGINS=trek.example.com` does not parse, so it ends up on localhost too. | | `OIDC_ISSUER` | Yes | Issuer URL of your identity provider. Must use HTTPS in production. | | `OIDC_CLIENT_ID` | Yes | OAuth 2.0 client ID registered with your IdP. | | `OIDC_CLIENT_SECRET` | Yes | OAuth 2.0 client secret. | Register the following **redirect URI** with your identity provider: ``` /api/auth/oidc/callback ``` For example: `https://trek.example.com/api/auth/oidc/callback` ## Optional environment variables | Variable | Description | |---|---| | `OIDC_DISPLAY_NAME` | Label shown on the SSO button. Defaults to `SSO`. | | `OIDC_ONLY` | Set to `true` to disable local password login and password registration. SSO login and SSO registration remain governed by their own toggles. This is an environment-variable-only setting and cannot be toggled at runtime via the admin panel. | | `OIDC_ADMIN_CLAIM` | OIDC claim to inspect for admin role mapping. Defaults to `groups`. The claim value may be an array or a plain string. **Env var only — not configurable via the admin panel.** | | `OIDC_ADMIN_VALUE` | Value that must be present in `OIDC_ADMIN_CLAIM` to grant the admin role. If unset, claim-based role mapping is disabled. When set, the role is re-evaluated on every login. **Env var only — not configurable via the admin panel.** | | `OIDC_SCOPE` | Overrides the default scope list sent to the provider. Defaults to `openid email profile`. Ensure `openid` and `email` are always included. **Env var only — not configurable via the admin panel.** | | `OIDC_DISCOVERY_URL` | Full URL to the OIDC discovery document. Use this for providers with non-standard discovery paths (e.g. Authentik tenants). If unset, discovery is attempted at `/.well-known/openid-configuration`. The discovery document is cached for 1 hour. | ## New-user registration via SSO When an SSO login matches an existing TREK account by OIDC subject (`sub`), that account is used directly. When it matches only by **email**, the OIDC identity is linked to that account only if the provider asserts `email_verified` for it; if the claim is missing or false the login is rejected with an `email_not_verified` error, so an unverified address can never take over a local account. Make sure your IdP includes `email_verified` in the userinfo response — it is part of the `email` scope. If no matching account exists, TREK attempts to create one. The outcome depends on the following: - **First user ever**: always created as admin, no invite required. - **Open SSO registration enabled** (admin panel toggle `oidc_registration`): account is created as a regular user. - **Invite token present** in the login URL: account is created regardless of the registration toggle. Pass the token as `?invite=` when initiating SSO login (e.g. `GET /api/auth/oidc/login?invite=`). - **SSO registration disabled and no invite**: login is rejected with a `registration_disabled` error. ## Admin panel (runtime configuration) OIDC can also be configured without environment variables via **Admin → Settings**, in the **Single Sign-On (OIDC)** card. The following fields are settable at runtime: | Field | Env var equivalent | |---|---| | Issuer URL | `OIDC_ISSUER` | | Client ID | `OIDC_CLIENT_ID` | | Client Secret | `OIDC_CLIENT_SECRET` | | Display name | `OIDC_DISPLAY_NAME` | | Discovery URL | `OIDC_DISCOVERY_URL` | Environment variables take priority over database settings when both are present. The following variables are **env var only** and have no admin panel equivalent: `OIDC_ONLY`, `OIDC_SCOPE`, `OIDC_ADMIN_CLAIM`, `OIDC_ADMIN_VALUE`. The `OIDC_ONLY` env var always overrides the panel's login-method toggles. To disable password login at runtime without `OIDC_ONLY`, use the **password_login** and **password_registration** toggles in Admin → Settings instead. > **Note:** The admin panel prevents you from disabling all login methods simultaneously. At least one method (password or SSO) must remain active. Similarly, you cannot remove the OIDC configuration from the admin panel while password login is disabled. --- **See also:** [Login-and-Registration](Login-and-Registration) · [Environment-Variables](Environment-Variables)