SSO Sessions

Autentico maintains SSO sessions so that once a user authenticates, subsequent authorization requests from any registered client are served without re-prompting for credentials — standard single sign-on behavior.

How SSO sessions work

When a user logs in successfully, Autentico creates a session record and stores a session cookie in the browser. The cookie is scoped to the Autentico domain.

On a new authorization request:

1. Autentico reads the session cookie
2. Looks up the session record in the database
3. Checks whether the session is still active and within the idle timeout window
4. If valid: issues an authorization code without showing the login page
5. If expired or missing: presents the login page

Session lifetime and idle timeout

Setting	Default	Description
sso_enabled	true	Enable SSO auto-login. When disabled, users must log in on every request. Device sessions are still tracked
sso_session_idle_timeout	4h	If the user has no activity for this long, the session expires. 0 for no idle expiration
sso_session_max_age	720h	Absolute maximum session lifetime regardless of activity. 0 for no limit

Uses Go duration format for timeouts: 24h, 168h, 720h, etc.

The session cookie’s Expires attribute is set to sso_session_max_age at login time. Changing this setting does not retroactively update existing cookies — increasing the value will not extend sessions already issued, and decreasing it relies on the server-side check to reject sessions that outlive the new limit.

The idle timeout can be overridden per-client, so different clients can have stricter session requirements. See Per-Client Overrides.

Session storage

Sessions are stored in the idp_sessions table with the following fields:

Field	Description
id	Opaque session ID, stored in the browser cookie
user_id	The authenticated user
user_agent	Browser user-agent string
ip_address	Client IP at login time
last_activity_at	Updated on each authorization request (used for idle timeout)
created_at	Session creation time
deactivated_at	Set when the session is explicitly logged out

Session expiry is not stored as a column. Instead, it is computed at validation time from created_at + sso_session_max_age. This means changes to sso_session_max_age apply retroactively to all existing sessions.

Logout

The GET /oauth2/logout endpoint is scoped to the current End-User session at this OP per OpenID Connect RP-Initiated Logout 1.0 §2. It reads the IdP session cookie, cascade-revokes that IdP session plus every OAuth session born from it (and their access/refresh tokens), clears the cookie, and redirects the user. Other devices the same subject is signed in on keep their sessions — matching Keycloak, Auth0, and Google behavior.

A dedicated “Sign out everywhere” action is separate from RP-Initiated Logout.

See Admin UI > Sessions for managing SSO sessions.

Tip

If a user’s session is still active when they visit /oauth2/authorize, they are logged in silently. This is what makes SSO work across multiple applications registered with the same Autentico instance.