Nimble out-of-band authentication for EAP (EAP-NOOB)
draft-ietf-emu-eap-noob-02
Network Working Group T. Aura
Internet-Draft Aalto University
Intended status: Standards Track M. Sethi
Expires: January 13, 2021 Ericsson
July 12, 2020
Nimble out-of-band authentication for EAP (EAP-NOOB)
draft-ietf-emu-eap-noob-02
Abstract
The Extensible Authentication Protocol (EAP) provides support for
multiple authentication methods. This document defines the EAP-NOOB
authentication method for nimble out-of-band (OOB) authentication and
key derivation. The EAP method is intended for bootstrapping all
kinds of Internet-of-Things (IoT) devices that have no pre-configured
authentication credentials. The method makes use of a user-assisted
one-directional OOB message between the peer device and
authentication server to authenticate the in-band key exchange. The
device must have an input or output interface, such as a display,
microphone, speakers or blinking light, which can send or receive
dynamically generated messages of tens of bytes in length.
Status of This Memo
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This Internet-Draft will expire on January 13, 2021.
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This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
Aura & Sethi Expires January 13, 2021 [Page 1]
Internet-Draft EAP-NOOB July 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. EAP-NOOB protocol . . . . . . . . . . . . . . . . . . . . . . 5
3.1. Protocol overview . . . . . . . . . . . . . . . . . . . . 5
3.2. Protocol messages and sequences . . . . . . . . . . . . . 8
3.2.1. Common handshake in all EAP-NOOB exchanges . . . . . 8
3.2.2. Initial Exchange . . . . . . . . . . . . . . . . . . 10
3.2.3. OOB Step . . . . . . . . . . . . . . . . . . . . . . 11
3.2.4. Completion Exchange . . . . . . . . . . . . . . . . . 13
3.2.5. Waiting Exchange . . . . . . . . . . . . . . . . . . 15
3.3. Protocol data fields . . . . . . . . . . . . . . . . . . 16
3.3.1. Peer identifier, realm and NAI . . . . . . . . . . . 16
3.3.2. Message data fields . . . . . . . . . . . . . . . . . 18
3.4. Fast reconnect and rekeying . . . . . . . . . . . . . . . 23
3.4.1. Persistent EAP-NOOB association . . . . . . . . . . . 23
3.4.2. Reconnect Exchange . . . . . . . . . . . . . . . . . 24
3.4.3. User reset . . . . . . . . . . . . . . . . . . . . . 27
3.5. Key derivation . . . . . . . . . . . . . . . . . . . . . 28
3.6. Error handling . . . . . . . . . . . . . . . . . . . . . 31
3.6.1. Invalid messages . . . . . . . . . . . . . . . . . . 33
3.6.2. Unwanted peer . . . . . . . . . . . . . . . . . . . . 33
3.6.3. State mismatch . . . . . . . . . . . . . . . . . . . 33
3.6.4. Negotiation failure . . . . . . . . . . . . . . . . . 33
3.6.5. Cryptographic verification failure . . . . . . . . . 34
3.6.6. Application-specific failure . . . . . . . . . . . . 34
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 35
4.1. Cryptosuites . . . . . . . . . . . . . . . . . . . . . . 35
4.2. Message Types . . . . . . . . . . . . . . . . . . . . . . 36
4.3. Error codes . . . . . . . . . . . . . . . . . . . . . . . 36
4.4. Domain name reservation considerations . . . . . . . . . 37
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