Endpoint authentication for AODV Route Messages
draft-perkins-manet-aodv-e2esec-00.txt

Abstract

This document specifies a new message TLV for AODVv2 and, potentially, other reactive protocols. The new message TLV allows the endpoints of a newly discovered route to be assured that they were the originator of the RREQ and responder producing the RREP respectively.

Status of This Memo

This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.

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This Internet-Draft will expire on September 4, 2016.

Copyright Notice

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Table of Contents

• 1. Introduction
• 2. Terminology
• 3. Algorithm for computing the Message TLV authenticator data
• 4. Format for the E2E Authenticator Message TLV
• 5. Security Considerations
• 6. IANA Considerations
• 6.1. Acknowledgement
• 7. Normative References
• Author's Address

1. Introduction

Hop-by-hop security for AODV relies on transitive trust between the nodes during route discovery. In case that some of the nodes may become compromised, it would be useful for the source and destination nodes for the discovered routes to be assured that they both participated in the route discovery process, and thus that a route was indeed established between them. This does not guarantee a functioning route because malicious intermediate nodes might still misdirect or drop traffic.

2. Terminology

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].

This document also uses some terminology from [RFC5444] and AODVv2 [I-D.ietf-manet-aodvv2].

3. Algorithm for computing the Message TLV authenticator data

The authentication algorithm uses HMAC-SHA-256-128 [RFC4868] to compute authentication data. The input data for the computation is the the concatenation of the following information contained in an AODVv2 [I-D.ietf-manet-aodvv2] message:

• OrigAddr
• TargAddr
• PrefixLengthList if present in the message
• OrigSeqNum if present in the message
• TargSeqNum if present in the message
• MetricType

The output of the computation is a 128-bit authenticator value which is used for the value field of the E2E Authenticator Message TLV.

4. Format for the E2E Authenticator Message TLV

The format for the E2E Authenticator Message TLV is shown in Figure 1.

     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |      Type     |    Flags      |           Reserved            |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    :                   Authenticator (128 bits)                    :
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+