# Jellyfin OIDC Auth Plugin

Log in to Jellyfin with any OpenID Connect provider (Authelia, Authentik, Keycloak, Pocket ID, Google, ...).

## How it works

1. User opens `https://<jellyfin>/OidcAuth/login`.
2. Plugin redirects to your provider (authorization code flow + PKCE via `IdentityModel.OidcClient`).
3. Provider redirects back to `https://<jellyfin>/OidcAuth/callback`; the plugin exchanges the code, validates the tokens, and maps claims to a Jellyfin user (creating it if configured).
4. A small callback page creates a Jellyfin session (`ISessionManager.AuthenticateDirect`), writes the credentials into the web client's local storage, and redirects to `/web/`.

## Build

Requires the .NET 9 SDK and `pyyaml`. The script compiles the plugin and packages
it the way Jellyfin expects — the DLLs listed in `build.yaml` plus a generated
`meta.json` — into `dist/oidc-auth_<version>.zip`:

```bash
pip install pyyaml
python scripts/build_plugin.py
```

Pass `--version 1.0.4.0` to override the version in `build.yaml`.

## Release

Releases are cut by pushing an annotated tag; the tag message becomes the changelog:

```bash
git tag -a v1.0.4.0 -m "What changed in this release."
git push origin v1.0.4.0
```

`.gitea/workflows/release.yml` then builds the plugin at that tag, commits the zip
to `dist/` on `main` together with an updated `manifest.json`, and attaches the zip
to the Gitea release. Jellyfin picks the new version up from the repository URL below.

Pushing needs a token with write access. Gitea's built-in `GITHUB_TOKEN` is used by
default; if the repository does not grant it write access, add a PAT as the
`RELEASE_TOKEN` secret.

## Install via plugin repository (recommended)

1. In Jellyfin: Dashboard → Plugins → Repositories → **+**
2. Repository URL:

   ```
   https://git.linxweiler.xyz/pascallinxweiler/jellyfinsso/raw/branch/main/manifest.json
   ```

3. Catalog → Authentication → **OIDC Auth** → Install → restart Jellyfin.

Updates show up in the catalog automatically when a new version is added to `manifest.json`.

## Install manually

Extract `dist/oidc-auth_<version>.zip` into a new folder in Jellyfin's plugin
directory (e.g. `config/plugins/OidcAuth/`), then restart Jellyfin. The zip holds:

- `Jellyfin.Plugin.OidcAuth.dll`
- `IdentityModel.OidcClient.dll`
- `IdentityModel.dll`
- `meta.json`

Requires Jellyfin 10.11.x.

## Configure

At your OIDC provider, create a **confidential web client** with redirect URI:

```
https://<jellyfin>/OidcAuth/callback
```

Then in Jellyfin: Dashboard → Plugins → OIDC Auth:

| Setting | Meaning |
|---|---|
| Issuer URL | Provider base URL; discovery doc must exist at `<issuer>/.well-known/openid-configuration` |
| Client ID / Secret | From your provider |
| Scopes | Default `openid profile email`; add `groups` if roles come via that scope |
| Username claim | Default `preferred_username`, falls back to `sub` |
| Role claim | Default `groups` |
| Allowed roles | CSV; empty = every authenticated user may log in |
| Admin roles | CSV; users with one of these roles are granted admin on SSO login. Missing role does **not** revoke admin unless "Also revoke admin" is enabled. Empty = plugin never touches the admin flag |
| Create users on first login | On by default; new users get access to all libraries |
| Set random password for auto-created users | On by default. Without it, Jellyfin accepts a **blank password** for these users from any client — convenient on a LAN-only server, dangerous on an exposed one |
| Disable strict endpoint validation | Enable for Google and other providers whose endpoints are on a different host than the issuer |

## Login button on the web login page

Jellyfin does not let plugins modify the login page. The login disclaimer is the
only injection point, and it needs a little CSS to look like a real button.

Dashboard → General → Branding → **Login disclaimer**:

```html
<a href="/OidcAuth/login" class="raised block emby-button">Sign in with SSO</a>
```

Dashboard → General → Branding → **Custom CSS**:

```css
.disclaimerContainer {
    display: block;
}

a.raised.emby-button {
    padding: 0.9em 1em;
    color: inherit !important;
    text-decoration: none;
}
```

Both pieces are needed. Jellyfin renders the disclaimer through markdown-it and
then DOMPurify, which strips the `is="emby-linkbutton"` attribute that would
normally turn the anchor into a button component — so the styling has to come
from the classes instead. `.disclaimerContainer` is not a block by default,
which is what otherwise leaves the link shrink-wrapped and centred instead of
matching the width of the buttons above it.

Styling via the theme's own classes rather than inline styles keeps the button
correct when the theme changes, since `.raised` is defined per theme.

## TV and native clients

The plugin does not change or disable Jellyfin's normal password login, so TV apps
(Android TV, Roku, Swiftfin, Kodi, ...) keep working exactly as before. For users
that exist only through OIDC, three options:

1. **Quick Connect** (recommended): enable it in Dashboard → General. On the TV choose
   Quick Connect, then approve the code from the web client (where you're logged in via OIDC).
2. **Set a password**: after the first OIDC login, the user sets a password in their
   web profile and uses that on the TV.
3. **Blank password** (LAN-only setups): turn off "Set random password for auto-created
   users" — TV login then works with username + empty password. Do **not** do this on a
   server reachable from the internet.

## Notes / limitations

- The OIDC browser flow itself works for the **web client** (and anything that can open a browser and reuse the resulting session token). Native clients that only show the username/password form can't use this flow directly — see the TV section above.
- Behind a reverse proxy, make sure Jellyfin sees the external scheme/host (`X-Forwarded-Proto`, `X-Forwarded-Host` — Jellyfin's "Known proxies" setting), otherwise the computed redirect URI won't match the one registered at the provider.
- Password login stays enabled; this plugin adds an additional login path.