Adding Support for Salted Password Databases to EAP-pwd
RFC 8146
| Document | Type |
RFC - Informational
(April 2017; No errata)
Updates RFC 5931
Was draft-harkins-salted-eap-pwd (individual)
|
|
|---|---|---|---|
| Last updated | 2017-04-21 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | (None) | |
| Document shepherd | Stefan Winter | ||
| Shepherd write-up | Show (last changed 2016-08-24) | ||
| IESG | IESG state | RFC 8146 (Informational) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Kathleen Moriarty | ||
| Send notices to | "Stefan Winter" <stefan.winter@restena.lu>, dharkins@arubanetworks.com | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
Internet Engineering Task Force (IETF) D. Harkins
Request for Comments: 8146 HP Enterprise
Updates: 5931 April 2017
Category: Informational
ISSN: 2070-1721
Adding Support for Salted Password Databases to EAP-pwd
Abstract
EAP-pwd is an Extensible Authentication Protocol (EAP) method that
utilizes a shared password for authentication using a technique that
is resistant to dictionary attacks. It includes support for raw keys
and double hashing of a password in the style of Microsoft Challenge
Handshake Authentication Protocol version 2 (MSCHAPv2), but it does
not include support for salted passwords. There are many existing
databases of salted passwords, and it is desirable to allow their use
with EAP-pwd.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc8146.
Harkins Informational [Page 1]
RFC 8146 NaCled EAP-pwd April 2017
Copyright Notice
Copyright (c) 2017 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction ....................................................3
1.1. Background .................................................3
1.2. Keyword Definition .........................................3
2. Salted Passwords in EAP-pwd .....................................3
2.1. Password Preprocessing .....................................3
2.2. The Salting of a Password ..................................5
2.3. Using UNIX crypt ...........................................5
2.4. Using scrypt ...............................................6
2.5. Using PBKDF2 ...............................................6
2.6. Protocol Modifications .....................................7
2.7. Payload Modifications ......................................8
3. IANA Considerations .............................................8
4. Security Considerations .........................................9
5. References ......................................................9
5.1. Normative References .......................................9
5.2. Informative References ....................................10
Acknowledgements ..................................................11
Author's Address ..................................................11
Harkins Informational [Page 2]
RFC 8146 NaCled EAP-pwd April 2017
1. Introduction
1.1. Background
Databases of stored passwords present an attractive target for attack
-- get access to the database, learn the passwords. To confound such
attacks, a random "salt" was hashed with the password and the
resulting digest stored, along with the salt, instead of the raw
password. This has the effect of randomizing the password; even if
two, distinct users have chosen the same password, the stored, and
salted, password will be different. It also requires an adversary
who has compromised the security of the stored database to launch a
dictionary attack per entry to recover passwords.
Dictionary attacks, especially using custom hardware, represent real-
world attacks and merely salting a password is insufficient to
protect a password database. To address these attacks, a sequential
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