At a Glance:
authentik is an open-source identity provider for modern single sign-on that supports SAML, OAuth2/OIDC, LDAP, and RADIUS protocols, designed to be self-hosted from small labs to large production clusters.
Overview:
authentik is an open-source Identity Provider (IdP) designed for modern single sign-on (SSO) across a range of standard protocols. The project supports SAML, OAuth2/OIDC, LDAP, and RADIUS, making it adaptable to diverse authentication requirements. authentik is built for self-hosting and can scale from small experimental environments to large production deployments. An enterprise offering is also available for organizations that need to replace existing commercial IdPs in large-scale identity management contexts. The project is suitable for system administrators and platform teams evaluating a self-hosted authentication layer that integrates with multiple standard protocols.
Key Decision Points:
Deployment model: authentik is designed for self-hosting and can be deployed across a range of scales, from small labs to large production clusters.
Protocol support: The IdP explicitly supports SAML, OAuth2/OIDC, LDAP, and RADIUS, covering a broad set of SSO integration scenarios.
Enterprise replacement path: An enterprise offering exists for organizations looking to replace existing commercial IdPs such as Okta, Auth0, Entra ID, or Ping Identity in large-scale environments.
Operational scope: The project is presented as a self-hosted authentication layer, without additional built-in device management, endpoint protection, or directory service claims in the provided overview.
Core Features:
SAML support: Provides SAML-based single sign-on capabilities.
OAuth2 and OIDC support: Includes support for OAuth2 and OpenID Connect authentication flows.
LDAP integration: Supports LDAP as an authentication backend or integration protocol.
RADIUS support: Offers RADIUS protocol support for network-level authentication.
Self-hosted deployment: Can be deployed in self-hosted environments, from small-scale setups to large production clusters.
Use Cases:
System administrators evaluating a self-hosted identity provider that works across SAML, OAuth2/OIDC, LDAP, and RADIUS environments.
Organizations assessing an open-source SSO layer as a potential replacement for commercial IdPs in large-scale identity management.
Platform teams needing a protocol-flexible authentication service that can scale from lab experimentation to production.
Open-Source Alternative Value:
authentik provides an open-source identity provider that organizations can self-host, supporting multiple standard authentication protocols without depending on a specific vendor's hosted service. Its described scope covers SAML, OAuth2/OIDC, LDAP, and RADIUS, making it relevant for environments that already work with or plan to adopt these protocols. The project explicitly positions itself as a potential replacement for commercial IdPs through its enterprise offering, giving teams an open-source starting point when evaluating self-hosted authentication infrastructure at scale.
