External OIDC provider — client setup for Controller

Audience: Platform and IdP administrators
Controller mode: AUTH_MODE=external
Applies to: Any OIDC-compliant provider (Keycloak, Microsoft Entra ID, Okta, Auth0, and similar)

This page is the OIDC client contract: client type, grants, redirect URIs, scopes, and access-token rules. For default groups/roles and per-provider recipes, see external-oidc-providers.md. Operator env and login flows: oidc-configuration.md.

Overview

Controller uses one confidential OIDC client for browser and CLI authentication when AUTH_MODE=external. The EdgeOps Console does not talk to the IdP as a public SPA. Controller is an OAuth BFF for the browser and a password-grant front door for the CLI.

Use case	Grant / flow	Controller endpoint
Browser (EdgeOps Console)	Authorization code + PKCE S256	GET /api/v3/user/oauth/authorize → IdP → GET /api/v3/user/oauth/callback
CLI (potctl)	Resource owner password (direct access)	POST /api/v3/user/login
Session refresh	Refresh token	POST /api/v3/user/refresh
Profile	Bearer access token (+ UserInfo)	GET /api/v3/user/profile
User APIs and operator WebSockets	Bearer access JWT	/api/v3/* except agent routes
Agent routes	Fog token	/api/v3/agent/* — OIDC does not apply

In external mode:

• Access and refresh tokens are issued by the IdP. Controller does not mint them.
• Controller validates access JWTs via the issuer JWKS (aud must be OIDC_CLIENT_ID).
• There is no local AuthUsers row for IdP users. RBAC comes from JWT claims (and optional RoleBindings).
• MFA, password policy, and forced password change are owned by the IdP. Controller does not run embedded interaction UI in this mode.

Controller environment (minimum)

Variable	Required	Example
AUTH_MODE	Yes	external
OIDC_ISSUER_URL	Yes	Full issuer URL (see providers)
OIDC_CLIENT_ID	Yes	pot-controller
OIDC_CLIENT_SECRET	Yes	Confidential client secret
CONTROLLER_PUBLIC_URL	Yes	https://controller.example.com
CONSOLE_URL	Yes (browser login)	https://console.example.com
TRUST_PROXY	When TLS terminates at ingress	true
AUTH_SESSION_STORE_TYPE	HA + browser login	database (mysql/postgres)
AUTH_INSECURE_ALLOW_HTTP	Development only	true when using http://localhost:*

OIDC_ISSUER_URL must be the issuer string, not a generic IdP homepage. Discovery is:

GET {OIDC_ISSUER_URL}/.well-known/openid-configuration

Do not set legacy KC_*, auth.realm, or auth.realmKey.

Optional OIDC_CONSOLE_CLIENT_ID / AUTH_CONSOLE_CLIENT_ENABLED registers a future SPA-direct public client. Default is off. Primary Console login uses this confidential Controller client via the BFF. Do not point Console at a second public client unless you intend to enable that path.

IdP client — required settings

Client type

Create one client for Controller. Do not use a public SPA, native, or device client as this client.

Setting	Required value	Why
Protocol	OpenID Connect	Controller is OIDC-only
Client type	Confidential (web application)	BFF uses OIDC_CLIENT_SECRET at the token endpoint
Client authentication	client_secret_basic or client_secret_post	Public (none) is not supported
PKCE	S256 required or allowed	Browser authorize always sends code_challenge_method=S256
Implicit / hybrid	Off	Not used
Device code	Off	Not used
Client credentials grant	Unused	Not used for operator login

Enabled grant types / flows

Flow	Required for	Notes
Standard flow (authorization code)	Browser Sign in	Required
Refresh token (offline_access)	Console/CLI session refresh	Required for POST /api/v3/user/refresh
Direct access grants (ROPC)	CLI POST /user/login	Required if potctl uses password login against the IdP
Implicit flow	—	Off (not used)

If your organization has disabled ROPC (common on Entra ID), browser login still works; CLI password login will not.

PKCE

Controller always sends PKCE S256 on browser authorize (code_challenge, code_challenge_method=S256).

Provider	Setting
Keycloak	PKCE Method = S256 (Capability config)
Others	Allow or require PKCE S256 on the authorization code flow

Disabling PKCE on the IdP is a development workaround only, not recommended for production.

Redirect URIs

Register exactly as a Web redirect URI (not SPA):

{CONTROLLER_PUBLIC_URL}/api/v3/user/oauth/callback

Examples:

• Production: https://controller.example.com/api/v3/user/oauth/callback
• Local: http://localhost:51121/api/v3/user/oauth/callback

Avoid overly broad wildcards in production.

Web origins (CORS)

If the Console calls the Controller API from a different origin, allow:

{CONSOLE_URL}

Example: http://localhost:3000 or https://console.example.com

Scopes

Requested by Controller (browser OAuth BFF)

Controller sends this scope string on authorize (not configurable):

openid profile email groups offline_access

Scope	Purpose
openid	OIDC baseline; sub, id_token
profile	preferred_username, display name
email	Email claim; identity linking
groups	RBAC group membership — name must be groups, not group
offline_access	Refresh token on authorization code flow

IdP client scope assignment

Every requested scope must be assigned to the client as a default and/or optional client scope.

Scope	Typical assignment
openid, profile, email, roles	Default
groups	Optional (scope name must be groups)
offline_access	Optional

Common error: invalid_scope when a scope is requested but not assigned to the client, when the scope name is wrong (group vs groups), or when the provider only accepts a full URI scope (api://…/groups) instead of the short name groups.

Access token requirements

Controller validates the access token, not the ID token, on API calls. Groups and roles on the ID token alone are ignored for authorization.

The access token must:

1. Be a JWT (opaque tokens fail).
2. Have iss equal to the discovered issuer.
3. Have aud equal to OIDC_CLIENT_ID (string or array containing it).
4. Carry RBAC claims on the access token (see external-oidc-providers.md).
5. Not be a refresh token (token_use must not be refresh).

If aud is Microsoft Graph, Okta api://default, or any API identifier that is not the client ID, Bearer validation fails and APIs return 401.

Issuer discovery (minimum metadata)

The issuer at OIDC_ISSUER_URL must expose:

Endpoint	Used for
authorization_endpoint	Browser OAuth BFF
token_endpoint	Code exchange, ROPC, refresh
jwks_uri	Bearer JWT validation
userinfo_endpoint	GET /user/profile in external mode
revocation_endpoint	Optional; best-effort logout

Groups, roles, and user identity

Create IdP groups or application roles named admin, sre, developer, and viewer. Those names map directly to Controller system roles (no RoleBinding required). Full mapping, claim order, and Keycloak / Entra ID / Okta / Auth0 recipes: external-oidc-providers.md.

User subject (first match): preferred_username → username → email → sub.

Group subjects from the access token (all lowercased):

1. resource_access[{OIDC_CLIENT_ID}].roles
2. Top-level roles array
3. Top-level groups array

MFA and forced password change

• Browser: enforced by the IdP during authorize (for example Keycloak required action UPDATE_PASSWORD)
• CLI: IdP password-grant policy applies
• Controller does not run embedded interaction UI in external mode

High availability

For multiple Controller replicas with browser login, set AUTH_SESSION_STORE_TYPE=database (mysql/postgres) so OAuth state and the PKCE verifier survive any replica. memory is only safe for a single replica.

Verification

Browser

1. Console Sign in → IdP login page (no invalid_scope or PKCE errors)
2. Callback → {CONSOLE_URL}/login#accessToken=...&refreshToken=...
3. Decode the access token: aud is OIDC_CLIENT_ID; iss matches the issuer; roles / groups / resource_access contains a system role name
4. GET /api/v3/user/profile with Authorization: Bearer <accessToken> → 200

CLI

curl -sS -X POST '{CONTROLLER_PUBLIC_URL}/api/v3/user/login' \
  -H 'Content-Type: application/json' \
  -d '{"email":"<login-id>","password":"<pass>","totp":""}'

email is the IdP login identifier (username or UPN). Expect { "accessToken", "refreshToken" } (IdP tokens).

Refresh

curl -sS -X POST '{CONTROLLER_PUBLIC_URL}/api/v3/user/refresh' \
  -H 'Content-Type: application/json' \
  -d '{"refreshToken":"<refresh>"}'

Troubleshooting

Error	Likely cause
invalid_scope	Missing groups or offline_access on the client; wrong scope name (group vs groups); provider requires a full URI scope
Missing parameter: code_challenge_method	PKCE required on IdP but not sent by Controller (upgrade Controller)
redirect_uri mismatch	Callback URL not registered exactly; URI registered as SPA instead of Web
Login works, no refreshToken in browser hash	offline_access not requested or not assigned on the IdP client
401 on API routes after login	Opaque access token; aud is not OIDC_CLIENT_ID; wrong iss
403 on API routes	Token valid but RBAC groups/roles not on the access token; see external-oidc-providers.md
CLI login fails, browser works	ROPC / direct access grants disabled
OAuth state errors on HA	AUTH_SESSION_STORE_TYPE still memory

Related documentation

Document	Topic
external-oidc-providers.md	Default groups/roles; Keycloak, Entra ID, Okta, Auth0 recipes
oidc-configuration.md	Auth modes and environment variables
rbac-reference.md	System roles, verbs, RoleBindings
swagger.yaml	/user/oauth/authorize, /user/oauth/callback, /user/login, /user/refresh, /user/profile