Optimizing BFD Authentication
draft-ietf-bfd-optimizing-authentication-03
Network Working Group M. Jethanandani
Internet-Draft Cisco Systems
Intended status: Standards Track A. Mishra
Expires: December 29, 2017 O3b Networks
A. Saxena
Ciena Corporation
M. Bhatia
Ionos Networks
June 27, 2017
Optimizing BFD Authentication
draft-ietf-bfd-optimizing-authentication-03
Abstract
This document describes an optimization to BFD Authentication as
described in Section 6.7 of BFD [RFC5880].
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
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This Internet-Draft will expire on December 29, 2017.
Copyright Notice
Copyright (c) 2017 IETF Trust and the persons identified as the
document authors. All rights reserved.
Jethanandani, et al. Expires December 29, 2017 [Page 1]
Internet-Draft BFD Authentication June 2017
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Authentication Mode . . . . . . . . . . . . . . . . . . . . . 3
3. NULL Auth TLV . . . . . . . . . . . . . . . . . . . . . . . . 4
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . 5
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
6.1. Normative References . . . . . . . . . . . . . . . . . . 5
6.2. Informative References . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
Authenticating every BFD [RFC5880] packet with a Simple Password, or
with a MD5 Message-Digest Algorithm [RFC1321] , or Secure Hash
Algorithm (SHA-1) algorithms is computationally intensive process,
making it difficult if not impossible to authenticate every packet -
particularly at faster rates. Also, the recent escalating series of
attacks on MD5 and SHA-1 [SHA-1-attack1] [SHA-1-attack2] raise
concerns about their remaining useful lifetime as outlined in Updated
Security Considerations for the MD5 Message-Digest and the HMAC-MD5
Algorithm [RFC6151] and Security Considerations for the SHA-0 and
SHA-1 Message-Digest Algorithm [RFC6194]. If replaced by stronger
algorithms, the computational overhead, will make the task of
authenticating every packet even more difficult to achieve.
This document proposes that only BFD frames that signal a state
change in BFD be authenticated. Rest of the frames can be
transmitted and received without authentication enabled. Most frames
that are transmitted and received have no state change associated
with them. Limiting authentication to frames that affect a BFD
session state allows more sessions to be supported for
authentication. Moreover, most BFD frames that signal a state change
are generally transmitted at a slower interval of 1s leaving enough
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