Preparation, Enforcement, and Comparison of Internationalized Strings Representing Usernames and Passwords
RFC 8265
| Document | Type |
RFC - Proposed Standard
(October 2017; Errata)
Obsoletes RFC 7613
|
|
|---|---|---|---|
| Last updated | 2018-08-27 | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Marc Blanchet | ||
| Shepherd write-up | Show (last changed 2017-05-30) | ||
| IESG | IESG state | RFC 8265 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Ben Campbell | ||
| Send notices to | Marc Blanchet <Marc.Blanchet@viagenie.ca> | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
Internet Engineering Task Force (IETF) P. Saint-Andre
Request for Comments: 8265 Jabber.org
Obsoletes: 7613 A. Melnikov
Category: Standards Track Isode Ltd
ISSN: 2070-1721 October 2017
Preparation, Enforcement, and Comparison of Internationalized Strings
Representing Usernames and Passwords
Abstract
This document describes updated methods for handling Unicode strings
representing usernames and passwords. The previous approach was
known as SASLprep (RFC 4013) and was based on Stringprep (RFC 3454).
The methods specified in this document provide a more sustainable
approach to the handling of internationalized usernames and
passwords. This document obsoletes RFC 7613.
Status of This Memo
This is an Internet Standards Track document.
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). Further information on
Internet Standards is available in 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
https://www.rfc-editor.org/info/rfc8265.
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
(https://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.
Saint-Andre & Melnikov Standards Track [Page 1]
RFC 8265 PRECIS: Usernames and Passwords October 2017
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Usernames . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1. Definition . . . . . . . . . . . . . . . . . . . . . . . 5
3.2. Case Mapping vs. Case Preservation . . . . . . . . . . . 6
3.3. UsernameCaseMapped Profile . . . . . . . . . . . . . . . 7
3.3.1. Rules . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3.2. Preparation . . . . . . . . . . . . . . . . . . . . . 8
3.3.3. Enforcement . . . . . . . . . . . . . . . . . . . . . 8
3.3.4. Comparison . . . . . . . . . . . . . . . . . . . . . 9
3.4. UsernameCasePreserved Profile . . . . . . . . . . . . . . 9
3.4.1. Rules . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4.2. Preparation . . . . . . . . . . . . . . . . . . . . . 9
3.4.3. Enforcement . . . . . . . . . . . . . . . . . . . . . 10
3.4.4. Comparison . . . . . . . . . . . . . . . . . . . . . 10
3.5. Application-Layer Constructs . . . . . . . . . . . . . . 11
3.6. Examples . . . . . . . . . . . . . . . . . . . . . . . . 11
4. Passwords . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1. Definition . . . . . . . . . . . . . . . . . . . . . . . 13
4.2. OpaqueString Profile . . . . . . . . . . . . . . . . . . 14
4.2.1. Preparation . . . . . . . . . . . . . . . . . . . . . 14
4.2.2. Enforcement . . . . . . . . . . . . . . . . . . . . . 14
4.2.3. Comparison . . . . . . . . . . . . . . . . . . . . . 15
4.3. Examples . . . . . . . . . . . . . . . . . . . . . . . . 15
5. Use in Application Protocols . . . . . . . . . . . . . . . . 16
6. Migration . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.1. Usernames . . . . . . . . . . . . . . . . . . . . . . . . 17
6.2. Passwords . . . . . . . . . . . . . . . . . . . . . . . . 19
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 20
7.1. UsernameCaseMapped Profile . . . . . . . . . . . . . . . 20
7.2. UsernameCasePreserved Profile . . . . . . . . . . . . . . 20
7.3. OpaqueString Profile . . . . . . . . . . . . . . . . . . 21
7.4. Stringprep Profile . . . . . . . . . . . . . . . . . . . 22
8. Security Considerations . . . . . . . . . . . . . . . . . . . 22
8.1. Password/Passphrase Strength . . . . . . . . . . . . . . 22
8.2. Password/Passphrase Comparison . . . . . . . . . . . . . 22
8.3. Identifier Comparison . . . . . . . . . . . . . . . . . . 22
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