Authorization
Authorization is the security process that determines what authenticated users are allowed to do within an application. It operates as a complementary mechanism to authentication, which verifies user identity. While authentication answers “who are you?”, authorization answers “what are you permitted to access?” In web applications, authorization typically involves checking user roles, permissions, or claims before granting access to specific resources, features, or data.
Common Authorization Models
Role-Based Access Control (RBAC) is one of the most widely used authorization approaches. In RBAC, users are assigned to roles such as “admin,” “editor,” or “viewer,” and each role has a defined set of permissions. This model works well for applications with clear hierarchical structures and a limited number of distinct user types.
Attribute-Based Access Control (ABAC) provides a more granular alternative by making access decisions based on user attributes, resource attributes, and environmental conditions. This approach offers greater flexibility but requires more complex configuration and maintenance.
Implementation in Web Applications
When building web applications with Firebase and similar platforms, authorization is typically enforced both on the client side for user experience and on the server side for security. Server-side authorization is critical because client-side checks can be bypassed. Developers define authorization rules that validate user permissions before database reads and writes are permitted, ensuring that users can only access data appropriate to their role or permission level.