What is the conception behind the authentication of Radius Server?

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Remote Authentication Dial-In User Service defines the meaning of the term RADIUS. It is a networking protocol that assists client servers. It is a UDP-based protocol that mainly utilizes a mysterious secret to verify the user's activities. 802.1 X wi-fi authentication is a verification protocol that authenticates the user's identity whenever they try to access the network resources for working purposes. The user identity is directly linked to the Radius Server.



The term Freeradius was discovered in June 1999 by two personalities, Miquel van  Smoorenburg and Alan Dekok. More than 100 million people use freeradius to access the internet daily. It has been discovered that Freeradius is responsible for verifying approx. 1/3 of the users on the internet.



By cross-referencing the user's credentials with a database, the RADIUS server validates their identity. The Radius Server receives the credentials from the RADIUS client and checks them against an authentication database to verify their authenticity. Authorization information is delivered back to the Client if the credentials are true. Access control lists (ACLs) are one example of this, which outline the networks and resources to which each user has access.


 

  • The RADIUS Client attempts self-authentication in the first stage by utilizing its user credentials..
  • A username and password is used by the client to have access to the Radius Server.
  • Users are authenticated by the RADIUS server using the request's information against a third-party database (such as Active Directory).
  • If the RADIUS Server discovers a match, it pulls more information about that user from its database.
  • When a user's credentials match an access policy or profile, the RADIUS server verifies this. If one discovers this, an Access-Challenge request will be submitted, and MFA (if enabled) will be requested.
  • To answer to the Access-Challenge request, you will need to enter an OTP or accept a push notification. That answer will be verified by the Radius server.
  • If the RADIUS server is able to validate the response, it will send an Access-Accept message to your device.
  • RADIUS returns an Access-Reject message and stops the transaction if the server's answer does not comply with a policy or is invalid. Access to the system will be prohibited to the user.
  • A shared secret and a filter ID property are both included in the Access-Accept message. If the Radius client fails to recognize the Shared Secret, the message is automatically declined. 
  • The user is then joined to a specific RADIUS Group by the RADIUS Client using this Filter ID.
  • Now that the user can freely connect with the network. 

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