Overview
Authelia is an open-source authentication and authorization server providing single sign-on (SSO), two-factor authentication (2FA), and access control policies for web applications. Designed as a modern identity and access management (IAM) solution, Authelia acts as a forward authentication gateway that sits in front of applications, enforcing authentication and authorization before allowing access to protected resources.
At its architectural core, Authelia implements the OAuth 2.0 and OpenID Connect (OIDC) protocols, enabling integration with reverse proxies like Nginx, Traefik, Caddy, and HAProxy. When a user attempts to access a protected application, the reverse proxy forwards the authentication request to Authelia, which challenges the user for credentials, validates multi-factor authentication, evaluates access control rules, and returns authorization decisions to the proxy.
Authelia's multi-factor authentication support includes TOTP (Time-based One-Time Passwords) compatible with Google Authenticator and Authy, WebAuthn for hardware security keys like YubiKey, and push notifications through Duo Mobile. This layered security ensures that even if passwords are compromised, unauthorized access is prevented through second-factor verification.
The platform's fine-grained access control engine enables administrators to define rules based on user identity, group membership, IP address, subnet, network type (internal vs external), time of day, and requested resources. Rules can specify authentication levels (bypass, one_factor, two_factor) and apply different policies to different applications or URL patterns, providing flexible security postures tailored to application sensitivity.
For VPS hosting environments, self-hosting Authelia provides enterprise-grade authentication capabilities without dependency on cloud IAM services like Auth0, Okta, or AWS Cognito. Organizations gain complete control over user data, authentication flows, and access policies while eliminating per-user licensing costs typical of commercial identity platforms.
Authelia supports multiple authentication backends including LDAP for Active Directory integration, file-based user database for simple deployments, and future planned support for additional identity providers. This flexibility enables integration with existing corporate directories or standalone deployments for small teams without complex infrastructure requirements.
Session management handles authentication state across applications through encrypted session cookies with configurable expiration, inactivity timeouts, and refresh policies. Single sign-on enables users to authenticate once and access multiple protected applications without repeated login prompts, improving user experience while maintaining security through centralized policy enforcement.
The platform's notification system supports email notifications for password reset, device registration confirmations, and security events. Integration with SMTP servers enables delivery of authentication codes, magic links, and administrative alerts for suspicious activity or policy violations.
Authelia's deployment architecture supports high availability through Redis session storage backend, enabling multiple Authelia instances to share session state for load balancing and failover scenarios. PostgreSQL or MySQL storage for user preferences and device registrations provides durability and consistency across instances.
Key Features
Comprehensive Multi-Factor Authentication
TOTP, WebAuthn hardware keys (YubiKey, etc.), and Duo push notifications. Configurable per-application requiring 2FA for sensitive resources while allowing single-factor for internal tools.
Fine-Grained Access Control Policies
Rule-based authorization by user, group, IP, subnet, network type, time, and resources. Different authentication levels per application with regex pattern matching for URL paths.
Universal Reverse Proxy Integration
Forward authentication support for Nginx, Traefik, Caddy, HAProxy, and Envoy. Protect any web application regardless of technology stack without application modifications.
OpenID Connect and OAuth 2.0
Standards-based OIDC provider for SSO integration with applications supporting OAuth. Provides identity tokens with user claims for application authorization decisions.
Enterprise Authentication Backends
LDAP/Active Directory integration for existing corporate directories or file-based user database for standalone deployments. Flexible authentication source configuration.
Single Sign-On Across Applications
Authenticate once and access multiple protected applications without repeated logins. Centralized session management with configurable expiration and refresh policies.
İstifadə halları
- **Internal Tool Protection**: Secure admin panels, databases interfaces, monitoring dashboards, and development tools behind SSO with 2FA for authorized users only
- **Compliance and Data Protection**: Meet compliance requirements (SOC 2, HIPAA, GDPR) by enforcing multi-factor authentication and access logging for sensitive applications
- **Remote Access Security**: Protect self-hosted services exposed to the internet with strong authentication, preventing unauthorized access to internal infrastructure
- **Multi-Tenant SaaS Platforms**: Provide authentication and authorization for customer-facing applications with tenant-specific access control policies
- **Home Lab and Personal Infrastructure**: Secure home automation, media servers, NAS systems, and personal services with centralized authentication
- **Development and Staging Environments**: Protect non-production environments with authentication while avoiding production-grade infrastructure costs
Installation Guide
Install Authelia using Docker Compose for simplified deployment with persistent storage and configuration management. Create configuration file defining authentication backends, access control rules, storage backends, and notification settings. Mount configuration and data directories as volumes for persistence.
Configure reverse proxy to forward authentication requests to Authelia using auth_request directive in Nginx, ForwardAuth middleware in Traefik, or forward_auth directive in Caddy. Proxy passes authentication headers (Remote-User, Remote-Groups) to backend applications after successful authentication.
Set up SMTP server configuration for password resets and 2FA device registration emails. Configure sender address, SMTP credentials, and TLS settings. For development, use services like Mailhog or MailDev for email testing without external SMTP access.
Define access control rules in configuration YAML specifying which users or groups can access which applications. Configure authentication levels (bypass, one_factor, two_factor) based on resource sensitivity. Use network rules to allow internal access without authentication while requiring 2FA for external connections.
For production deployments, configure Redis as session storage backend for high availability and horizontal scaling across multiple Authelia instances. Set up PostgreSQL or MySQL for persistent storage of user preferences and registered devices. Enable health check endpoints for load balancer monitoring and automatic failover.
Configure OIDC clients for applications supporting OAuth 2.0 authentication. Register client IDs, secrets, redirect URLs, and scope configurations. Applications request authentication through Authelia's OIDC endpoints, receiving identity tokens with user information upon successful authentication.
Configuration Tips
Authelia configuration is managed through configuration.yml file defining authentication backends, access control, storage, notifications, and identity providers. Configure authentication_backend with file provider for simple deployments or LDAP connection strings for Active Directory integration.
Define access_control rules specifying domain patterns, resource paths, and policies. Use subject filters for user or group matching, networks array for IP-based rules, and policy values (bypass, one_factor, two_factor). Order matters—first matching rule applies, so place specific rules before catch-all rules.
Configure session management settings including name, secret for encryption, expiration duration, inactivity timeout, and remember_me duration. Set domain to parent domain for SSO across subdomains. Configure Redis connection for distributed session storage in clustered deployments.
Best practices include using strong randomly generated secrets for JWT signing and session encryption, configuring HTTPS-only cookies in production, implementing rate limiting on authentication endpoints to prevent brute force attacks, enabling logging with appropriate verbosity for security auditing, defining least-privilege access control policies granting minimum necessary permissions, regularly reviewing audit logs for suspicious authentication attempts, configuring backup MFA methods (email codes) for recovery scenarios when hardware tokens are lost, using separate Authelia instances for different security zones (internal vs public-facing), implementing IP whitelisting for administrative interfaces, and periodic rotation of secrets and encryption keys. Use environment variables for sensitive configuration values rather than hardcoding in YAML files.
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