Adds a bundled dashboard-auth provider plugin that authenticates the
web dashboard against any conformant self-hosted OpenID Connect server
(Authentik, Keycloak, Zitadel, Authelia, Auth0, Okta, Google, …) using
standard OIDC — no per-IDP code.
It's a pure drop-in plugin implementing the DashboardAuthProvider
protocol; it touches no core auth/runtime/login paths. Mechanics:
- OIDC discovery from {issuer}/.well-known/openid-configuration
(cached; issuer pinned; endpoints required HTTPS, loopback http
allowed for local-dev IDPs)
- authorization-code + PKCE (S256), public client
- verifies the OIDC ID token (RS256/ES256) against the discovered
jwks_uri with iss/aud pinned to the configured issuer/client_id, and
maps standard claims (sub/email/name/preferred_username, groups→org)
onto a Session
- standard refresh_token grant for silent re-auth; RFC 7009 revocation
on logout when advertised
Verifies the ID token (not the access token) because OIDC guarantees the
ID token is a signed JWT carrying identity, while access-token format is
opaque to the client per spec — the only universally-correct choice
across self-hosted IDPs.
Config via dashboard.oauth.self_hosted.{issuer,client_id,scopes} in
config.yaml or HERMES_DASHBOARD_OIDC_{ISSUER,CLIENT_ID,SCOPES} env vars
(env-wins-config, empty-is-unset — same convention as the nous plugin).
Confidential clients (client_secret) left as a documented TODO seam.
Docs: adds a Self-hosted OIDC section to the web-dashboard guide,
including a copy-paste Keycloak worked example (realm import + docker
run + dashboard wiring + login walkthrough).
Tests: 65 cases covering construction, discovery (incl. issuer
mismatch + https enforcement), start_login/PKCE, complete_login, ID
token verification, refresh/revoke, and env/config precedence.
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