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🔔 Subscribe to Ram N JavaWhat is User Authorization?
In web application security, validating a user is a two-step process: Authentication and Authorization. While authentication verifies who a user is (e.g., verifying a username and password), authorization determines what an authenticated user is permitted to do.
Authorization establishes access controls and privileges, ensuring that users can only access specific endpoints, resources, and administrative operations aligned with their assigned roles.
Authentication vs. Authorization
- Authentication: Confirms identity (e.g., logging in with credentials). The answer to: "Who are you?"
- Authorization: Enforces permissions and policies (e.g., regular user vs. administrator). The answer to: "Do you have permission to access this resource?"
How User Authorization Works in Servlets
The Java Servlet specification provides flexible mechanisms to implement role-based access control (RBAC):
- Declarative Security: Configured directly in the deployment descriptor (
web.xml) using elements like<security-constraint>,<auth-constraint>, and<security-role>to restrict URLs based on roles without modifying Java code. - Programmatic Security: Handled within the servlet code using built-in methods on
HttpServletRequest:isUserInRole(String role): Checks whether the authenticated user belongs to a specific security role (e.g.,"admin").getUserPrincipal(): Retrieves thePrincipalrepresenting the authenticated caller.getRemoteUser(): Returns the login username of the authenticated client.
Recommended Next Watch
Continue mastering web security and authentication with these recommended tutorials:
Click here to watch in Youtube : https://www.youtube.com/watch?v=XyJe3jXEeqo
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