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Understanding RADIUS Attribute Key Exchange for Enhanced Security

This document outlines the processes involved in RADIUS attribute key exchanges, focusing on key requests and responses between a domain's AAA server and local re-authentication servers. It addresses key types, their attributes, and identifiers like DSRK and MSK. Additionally, the security considerations emphasize the importance of using protocols like IPsec for secure communication. With references to newer drafts and discussions, it highlights the ongoing efforts to enhance key management in network security protocols, setting the stage for further developments in the HOKEY working group.

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Understanding RADIUS Attribute Key Exchange for Enhanced Security

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  1. draft-gaonkar-radext-erp-attrs-00 Kedar Gaonkar Lakshminath Dondeti

  2. New RADIUS attributes • a visited domain AAA server requesting a key • Key Request • The home domain (AS) delivering the key • Key Response

  3. ERP Exchange with Local Re-auth Server Local Re-auth Server Peer Auth1 Auth2 AS Initial EAP Exchange Full EAP Exchange MSK, EMSK, DSRK MSK, EMSK, DSRK1, DS-rRK1, DS-rIK1 EAP Success EAP Success EAP Success (MSK) (MSK, VMSK1) MSK DSRK1, DS-rRK1, DS-rIK1 Subsequent EAP-ER Exchange EAP Request Identity (Optional message) EAP Re-auth Initiate (authenticated with L-rIK1) rMSK11 EAP Re-auth Finish (authenticated with L-rIK1) (rMSK11) rMSK11 rMSK11

  4. Key-Request Attribute Type Length Key-Type Requesting Entity’s Identity (String) … Key Type: 0 : Reserved 1 : Domain Specific Root Key (DSRK)

  5. Key-Response attribute Type Length Key type Key Length Key Lifetime (4 octets) …… Key Name (8 octets) …… Key (Variable) … ... Requesting Entity’s Identity (String, Variable) … …

  6. Security Considerations • The draft at the moment says use IPsec • There was discussion on this topic • End-to-end encapsulation using keywrap • The technique of the keyreq document can be used with these attributes as well

  7. Next Steps • We presented this at the HOKEY WG • After a brief discussion, it appears that we can use draft-zorn-radius-keywrap-13 • We have one more use case for that I-D now

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