TLS-RSA-PSK. Channel Binding using Transport Layer Security with Pre Shared Keys
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1 TLS-RSA-PSK Channel Binding using Transport Layer Security with Pre Shared Keys Christian J. Dietrich dietrich [at] internet-sicherheit. de Institut für Internet-Sicherheit FH Gelsenkirchen
![Dietrich dietrich [at] internet-sicherheit.](/docs-images/41/6870753/images/page_1.jpg "de Institut für Internet-Sicherheit https://www.")
2 Introduction Nov. 2010: New German ID card eid functionality authenticate mutually between eid card and eid server transmit personal data from eid card to eid server (securely) Extended Access Control (by BSI) 3 kinds of card readers Basic (no pinpad) Standard Comfort 2
3 Terminal and Chip Authentication Terminal 1. PACE 2. Terminal Authentication 1. PACE Bind eid to card reader (Diffie- Hellman) 2. Term. Authentication eid card authenticates the Terminal (Terminal Certificate) 3. Chip Authentication 3. Chip Authentication Terminal authenticates the eid card BSI Technical Guideline TR
4 eid authentication in practice Lots of components involved Browser, Browser plugin 2 Servers eid reader & card Several TLS connections However: Connection management is browser s concern! 4
5 Channel Binding Bind channel BS to CS eid Server generates a Pre Shared Key and sends it via BS to the Web Browser Browser plugin is triggered and provides the PSK to eid API client PSK is then used to establish CS 5
6 Transport Layer Security (TLS/SSL) Negotiate Cipher Suite Session Key agreement Optional server authentication Client Cipher Suites negiotiation Session Key agreement Server authentication Server Pre Master Secret (PMS) Input to the key derivation function (PRF) in order to get the Master Secret Master Secret (MS) 48 byte fixed length output from PRF Derive session keys for encryption and hashing (HMAC) PMS [PRF] V MS PMS [PRF] V MS 6
7 TLS with Pre Shared Keys Defined in RFC 4279 (Dec 2005) 3 variants of TLS with PSK Plain PSK No server authentication No Perfect Forward Secrecy RSA-PSK Server authentication (certificate) No Perfect Forward Secrecy DHE-PSK No server authentication Perfect Forward Secrecy 7
8 usual TLS with plain RSA Certificate message required Client ClientHello Server ServerKeyExchange is optional (not needed for plain RSA) ClientKeyExchange ServerHello Certificate (ServerKeyExchange) ServerHelloDone Client builds premaster secret pms = (client_version, 46 random bytes) ClientKeyExchange ChangeCipherSpec Finished Transmit encrypted premaster secret to the server RSAEncrypt(pubkey Server, pms) ChangeCipherSpec Finished Application Data 8
9 TLS with plain PSK ServerKeyExchange Provide a hint for the client identity (username) ClientKeyExchange Transmit client_identity to the server Both parties build the premaster secret as follows pms = (len(psk), 0x00 * len(psk), len(psk), PSK) Client ClientHello ServerHello (Certificate) ServerKeyExchange ServerHelloDone ClientKeyExchange ChangeCipherSpec Finished ChangeCipherSpec Finished Application Data Server 9
10 TLS with RSA-PSK ServerKeyExchange Provide a hint for the client identity (username) ClientKeyExchange Client builds premaster secret Client ClientHello ServerHello Certificate ServerKeyExchange ServerHelloDone Server pms = (0x30, client_version, 46 random bytes, len(psk), PSK) ClientKeyExchange ChangeCipherSpec Finished Transmit client_identity and encrypted premaster secret to the server RSAEncrypt(pubkey Server, pms) ChangeCipherSpec Finished Application Data 10
11 eid authentication: why RSA-PSK? PSK is required in order to bind channel BS to channel CS Why is RSA Server Authentication required? The Terminal Authentication is bound to a certain eid Server! The Hash of the eid Server Certificate is stored in the Terminal Certificate The Hash of the Web Application Server is stored in the Terminal Certificate, too! 11
12 Binding eid to certain Servers RSA Server Authentication Terminal Authentication is restricted to certain Servers eid Server Web Application Server 12
13 Extending eid trust to BS and BW Sequence of trusted channels is extended to cover the channels CS, BS and BW (in theory) Renders Man-in-the-middle attacks useless 13
14 Transport Layer Security with Pre Shared Keys Thank you. Questions? Christian J. Dietrich dietrich [at] internet-sicherheit. de Institut für Internet-Sicherheit FH Gelsenkirchen
![Dietrich dietrich [at] internet-sicherheit.](/docs-images/41/6870753/images/page_14.jpg "de Institut für Internet-Sicherheit https://www.")
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