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DTLS Identities

DTLS Identities. Charles Clancy 25 January 2007 CAPWAP Interim. Problem. Need to authorize and authenticate both PKI and PSK ciphersuites Certificates by default have identites PSKs do not Need identity to do authorization During PSK auth: AC sends PSK_Hint WTP sends PSK_Identity.

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DTLS Identities

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  1. DTLS Identities Charles Clancy 25 January 2007 CAPWAP Interim

  2. Problem • Need to authorize and authenticate both PKI and PSK ciphersuites • Certificates by default have identites • PSKs do not • Need identity to do authorization • During PSK auth: • AC sends PSK_Hint • WTP sends PSK_Identity

  3. Unified Approach • Approach: • CAPWAP_Identity = MAC @ DOMAIN • CN = CAPWAP_Identity (AC or WTP) • PSK_Hint = CAPWAP_Identity (AC) • PSK_Identity = CAPWAP_Identity (WTP) • Pros: • Can do ACLs like (* @ DOMAIN) • Can specify NULL domain (mfgr provisioned certs) • Problem: • Not normal cert handling (O/OU specify domain) • Network-wide PSKs – need mapping on AC for all WTPs

  4. Split Approach • Certs • CN = MAC • O/OU = Administrative Domain • PSKs Identity and Hint • Some preformatted key name • Maybe KeyName = Hash(PSK || “CAPWAP PSK”) • Leave unspecified • Provision key name with the PSK • Drawback • Need more complex back-end authorization service to handle multiple different types of identities

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