Authelia is an open-source authentication and authorization server that provides a single sign-on (SSO) experience for web applications. It aims to enhance security and protect sensitive information by implementing multi-factor authentication (MFA) and other advanced authentication mechanisms. Authelia supports various authentication methods such as one-time passwords (OTP), U2F devices, TOTP, and WebAuthn. This allows users to choose the most suitable option for their needs. It also integrates with external identity providers like Google, GitHub, and LDAP directories. One of the key features of Authelia is its support for SSO across multiple applications. Once a user has authenticated themselves with Authelia, they can access other applications without needing to re-enter their credentials. This improves usability and reduces the need for remembering multiple usernames and passwords. Additionally, Authelia provides a robust authorization framework that allows administrators to define fine-grained access control policies based on various criteria such as user roles or groups. This ensures that only authorized users can access specific resources or perform certain actions within an application. Authelia is designed to be highly scalable and can handle a large number of users concurrently. It can be deployed on-premises or in the cloud and integrates seamlessly with existing infrastructure components such as reverse proxies and load balancers. # According to Bard: Authelia doesn't do ABAC Authelia does not inherently support Attribute-Based Access Control (ABAC), but it can be used in conjunction with external ABAC systems to implement fine-grained access control. Authelia is primarily an authentication and authorization proxy that focuses on single sign-on (SSO) and multi-factor authentication (MFA). It doesn't provide built-in ABAC capabilities, which involve evaluating user attributes and resource attributes to determine access permissions. However, Authelia can be integrated with external ABAC systems, such as Open Policy Agent (OPA), to implement ABAC-based access control. OPA can be used to define and enforce ABAC policies, and Authelia can integrate with OPA to retrieve access decisions based on user attributes, resource attributes, and environmental context. To implement ABAC with Authelia and OPA, you would typically follow these steps: 1. **Configure OPA:** Define ABAC policies in OPA using its policy language, Rego. 2. **Integrate Authelia with OPA:** Configure Authelia to send access requests to OPA for evaluation. 3. **Enforce OPA decisions:** Authelia will receive OPA's access decisions and enforce them by granting or denying access to the requested resource. This approach allows Authelia to focus on its primary strengths of authentication and authorization, while leveraging OPA's expertise in ABAC policy evaluation and enforcement. # Conclusion Overall, Authelia offers a comprehensive solution for secure authentication and authorization in web applications, enhancing security while improving user experience through SSO functionality. # References ```dataview Table title as Title, authors as Authors where contains(subject, "Authelia") ```