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SSO Solutions Comparison (Self-Hosted)

What it is

A comparative analysis of self-hosted Single Sign-On (SSO) and Identity and Access Management (IAM) solutions. These platforms enable users to use a single set of secure credentials to access multiple independent software systems within a homelab or enterprise environment. In June 2026, the focus has shifted toward high-performance, security-first identities like Kanidm and minimalist LDAP directories like LLDAP.

What problem it solves

Managing separate usernames and passwords for dozens of self-hosted services (Nextcloud, Gitea, etc.) is insecure and leads to "password fatigue." SSO centralizes authentication, enables mandatory Multi-Factor Authentication (MFA) or WebAuthn across all services, and simplifies the lifecycle management (onboarding/offboarding) of users.

Where it fits in the stack

SSO sits in the Identity and Access layer of the infrastructure stack. It typically integrates with a directory service (like LDAP or Kanidm's internal store) and provides standardized authentication protocols—OIDC (OpenID Connect), SAML 2.0, and OAuth2—to application-layer services.

Typical use cases

  • Homelab Consolidation: Unifying access to Gitea, Nextcloud, and Home Assistant dashboards.
  • Enterprise-Lite: Providing OIDC/SAML for small business internal tools with professional-grade security.
  • Legacy Support: Using LLDAP to provide authentication for older applications that only support the LDAP protocol.
  • Agentic Authentication: Allowing Claude 4.8 or GPT-5.5 agents to authenticate securely via OIDC to retrieve data from private services.

Strengths

Authentik

  • Versatility: Support for almost every modern protocol (OIDC, SAML, OAuth2, LDAP).
  • Outpost System: Built-in proxy and LDAP outposts for protecting applications that don't natively support SSO.
  • Extensive UI: Rich web-based interface for complex policy and flow management.

Kanidm

  • Security-First: Written in Rust with high security defaults (e.g., mandatory WebAuthn support).
  • Performance: Extremely fast and lightweight compared to Java or Python-based alternatives.
  • Modern Architecture: Built from the ground up to replace legacy tools like OpenLDAP.

LLDAP

  • Simplicity: Tiny resource footprint, perfect for low-power hardware like Raspberry Pi 5.
  • Ease of Setup: Focused purely on providing a clean, modern LDAP interface.

Limitations

Authentik

  • Resource Intensive: Requires significant RAM and CPU to run multiple containers (server, worker, PostgreSQL, Redis).
  • Complexity: The flexibility comes with a steep learning curve for configuring "Flows" and "Stages."

Kanidm

  • Strict Requirements: Requires proper TLS/SSL setup and DNS configuration to function, which can be difficult for beginners.
  • Protocol Gap: Primarily focuses on OIDC and LDAPS; SAML support is less mature than Authentik.

LLDAP

  • Protocol Limited: Only supports LDAP; requires a bridge (like Authelia or Authentik) to provide OIDC/SAML.

When to use it

  • Use Authentik if you need an all-in-one "Identity Provider" (IdP) that can handle everything from social logins to legacy LDAP proxying.
  • Use Kanidm if you prioritize security and performance and prefer a modern, CLI-centric workflow for managing your "Source of Truth."
  • Use LLDAP if you only need a simple, reliable directory for a few apps that support LDAP and want to keep resource usage minimal.

When not to use it

  • Avoid full SSO stacks for single-user setups; simple basic auth or Tailscale's built-in auth may suffice.
  • Avoid Authentik on 1GB RAM nodes; it will likely crash or suffer from performance degradation.
  • Avoid LLDAP if you need modern OIDC flows (unless paired with another tool).

Getting started

Authentik Setup

Deploy via Docker Compose: 

docker compose up -d
# Access the initial setup flow
curl -X GET http://localhost:9000/if/flow/initial-setup/

Kanidm Initialization

Initialize the server and retrieve the admin credentials: 

kanidmd recover-account idm_admin

LLDAP Deployment

Run the LLDAP container and access the management interface: 

docker run -p 17170:17170 -p 3890:3890 lldap/lldap:latest

CLI examples

Authentik Management

While primarily UI-driven, Authentik exposes a CLI for system status: 

ak system status
ak whoami

Kanidm CLI

The kanidm CLI is the primary way to manage users and groups: 

kanidm person create jules "Jules Agent"
kanidm group create automation-agents
kanidm group add-members automation-agents jules

LLDAP CLI Integration

Using standard ldapsearch with LLDAP: 

ldapsearch -H ldap://localhost:3890 -D "uid=admin,ou=people,dc=example,dc=com" -W -b "dc=example,dc=com"

API examples

OIDC Discovery Endpoint

All modern SSO providers expose a discovery URL for client configuration: 

GET https://sso.example.com/application/o/gitea/.well-known/openid-configuration

Kanidm OIDC Client Creation via API

kanidm system oauth2 create gitea "Gitea Instance" https://gitea.example.com/oauth2/callback

Authentik REST API

Authentik is fully API-driven; you can create users programmatically: 

curl -H "Authorization: Bearer $API_TOKEN" \
     -X POST https://authentik.example.com/api/v3/core/users/ \
     -d '{"username": "newuser", "name": "New User", "email": "user@example.com"}'

  • Authentik — The primary all-in-one SSO recommendation for homelabs.
  • n8n — For automating user onboarding/offboarding workflows via API.
  • Tailscale — For securing SSO endpoints and providing identity-based networking.
  • Authentik LDAP Outpost — Bridge OIDC-only IDPs to legacy LDAP apps.
  • OIDC vs SAML — Understanding modern auth protocols.
  • Nextcloud — Example of a service requiring robust SSO integration.
  • Authelia — A lightweight alternative for proxy-based authentication.
  • Gitea — Integrates natively with OIDC and LDAP providers.
  • Authentik OIDC Provider — Connecting external apps to your identity store.
  • WebAuthn/FIDO2 — Passwordless standards supported by modern SSO.

Sources / References

Contribution Metadata

  • Last reviewed: 2026-06-26
  • Confidence: high