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Code Editor : draft-ietf-sasl-saslprep-xx.txt

INTERNET-DRAFT                                   Kurt D. Zeilenga
Intended Category: Standards Track            OpenLDAP Foundation
Expires in six months                             27 October 2003

SASLprep: Stringprep profile for user names and passwords
                    <draft-ietf-sasl-saslprep-04.txt>

Status of Memo

This document is an Internet-Draft and is in full conformance with all
  provisions of Section 10 of RFC 2026.

This document is intended to be, after appropriate review and
  revision, submitted to the RFC Editor as a Standards Track document.
  Distribution of this memo is unlimited.  Technical discussion of this
  document will take place on the IETF SASL mailing list
  <ietf-sasl@imc.org>.  Please send editorial comments directly to the
  document editor <Kurt@OpenLDAP.org>.

Internet-Drafts are working documents of the Internet Engineering Task
  Force (IETF), its areas, and its working groups.  Note that other
  groups may also distribute working documents as Internet-Drafts.
  Internet-Drafts are draft documents valid for a maximum of six months
  and may be updated, replaced, or obsoleted by other documents at any
  time.  It is inappropriate to use Internet-Drafts as reference
  material or to cite them other than as ``work in progress.''

The list of current Internet-Drafts can be accessed at
  <http://www.ietf.org/ietf/1id-abstracts.txt>. The list of
  Internet-Draft Shadow Directories can be accessed at
  <http://www.ietf.org/shadow.html>.

Please see the Full Copyright section near the end of this document
  for more information.

Abstract

This document describes how to prepare Unicode strings representing
  user names and passwords for comparison.  The document defines the
  "SASLprep" profile of the "stringprep" algorithm to be used for both
  user names and passwords.  This profile is intended to be used by
  Simple Authentication and Security Layer (SASL) mechanisms (such as
  PLAIN, CRAM-MD5, and DIGEST-MD5) as well as other protocols exchanging

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user names and/or passwords.

1. Introduction

The use of simple user names and passwords in authentication and
  authorization is pervasive on the Internet.  To increase the
  likelihood that user name and password input and comparison work in
  ways that make sense for typical users throughout the world, this
  document defines rules for preparing internationalized user names and
  passwords for comparison.  For simplicity and implementation ease, a
  single algorithm is defined for both user names and passwords.

This document defines the "SASLprep" profile of the "stringprep"
  algorithm [StringPrep].

The profile is designed for use in Simple Authentication and Security
  Layer ([SASL]) mechanisms such as [PLAIN].  It may be applicable
  elsewhere simple user names and passwords are used.  This profile is
  not intended to be used for arbitrary text.  This profile is also not
  intended to be used to prepare identity strings which are not simple
  user names (e.g., e-mail addresses, domain names, distinguished
  names).

2. The SASLprep profile

This section defines the "SASLprep" profile.  This profile is intended
  to be used to prepare strings representing simple user names and
  passwords.

This profile uses Unicode 3.2, as defined in [StringPrep, A.1].

Character names in this document use the notation for code points and
  names from the Unicode Standard [Unicode].  For example, the letter
  "a" may be represented as either <U+0061> or <LATIN SMALL LETTER A>.
  In the lists of mappings and the prohibited characters, the "U+" is
  left off to make the lists easier to read.  The comments for character
  ranges are shown in square brackets (such as "[CONTROL CHARACTERS]")
  and do not come from the standard.

Note: a glossary of terms used in Unicode can be found in [Glossary].
  Information on the Unicode character encoding model can be found in
  [CharModel].

2.1. Mapping

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This profile specifies:
    - non-ASCII space characters [StringPrep, C.1.2] be mapped to SPACE
      (U+0020), and

- the "commonly mapped to nothing" characters [StringPrep, B.1] be
      mapped to nothing.

2.2. Normalization

This profile specifies using Unicode normalization form KC, as
  described in Section 4 of [StringPrep].

2.3. Prohibited Output

This profile specifies the following characters:

- Non-ASCII space characters [StringPrep, C.1.2],
    - ASCII control characters [StringPrep, C.2.1],
    - Non-ASCII control characters [StringPrep, C.2.2],
    - Private Use [StringPrep, C.3],
    - Non-character code points [StringPrep, C.4],
    - Surrogate code points [StringPrep, C.5],
    - Inappropriate for plain text [StringPrep, C.6],
    - Inappropriate for canonical representation [StringPrep, C.7],
    - Change display properties or are deprecated [StringPrep, C.8], and
    - Tagging characters [StringPrep, C.9].

are prohibited output.

2.4. Bidirectional characters

This profile specifies checking bidirectional strings as described in
  [StringPrep, Section 6].

2.5. Unassigned Code Points

This profile specifies [StringPrep, A.1] table as its list of
  unassigned code points.

3. Security Considerations

This profile is intended to used to prepare simple user names and

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passwords for comparison.  It is not intended to be used for to
  prepare identities which are not simple user names (e.g.,
  distinguished names and domain names).  Nor is the profile intended to
  be used for simple user names which require different handling.
  Protocols (or applications of those protocols) which have
  application-specific identity forms and/or comparison algorithms
  should use mechanisms specifically designed for these forms and
  algorithms.

User names and passwords should be protected from eavesdropping.

General "stringprep" and Unicode security considerations apply.  Both
  are discussed in [StringPrep].

4. IANA Considerations

This document details the "SASLprep" profile of [StringPrep] protocol.
  Upon Standards Action the profile should be registered in the
  stringprep profile registry.

Name of this profile: SASLprep
      RFC in which the profile is defined: This RFC
      Indicator whether or not this is the newest version of the
      profile: This is the first version of the SASPprep profile.

5. Acknowledgment

This document borrows text from "Preparation of Internationalized
  Strings ('stringprep')" and "Nameprep: A Stringprep Profile for
  Internationalized Domain Names", both by Paul Hoffman and Marc
  Blanchet.

This document is a product of the IETF SASL WG.

6. Normative References

[StringPrep]  Hoffman P. and M. Blanchet, "Preparation of
                Internationalized Strings ('stringprep')",
                draft-hoffman-rfc3454bis-xx.txt, a work in progress.

[SASL]        Melnikov, A. (Editor), "Simple Authentication and
                Security Layer (SASL)",
                draft-ietf-sasl-rfc2222bis-xx.txt, a work in progress.

[Unicode]     The Unicode Consortium, "The Unicode Standard, Version

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INTERNET-DRAFT       draft-ietf-sasl-saslprep-04.txt     27 October 2003

3.2.0" is defined by "The Unicode Standard, Version 3.0"
                (Reading, MA, Addison-Wesley, 2000. ISBN 0-201-61633-5),
                as amended by the "Unicode Standard Annex #27: Unicode
                3.1" (http://www.unicode.org/reports/tr27/) and by the
                "Unicode Standard Annex #28: Unicode 3.2"
                (http://www.unicode.org/reports/tr28/).

7. Informative References

[Glossary]    The Unicode Consortium, "Unicode Glossary",
                <http://www.unicode.org/glossary/>.

[CharModel]   Whistler, K. and M. Davis, "Unicode Technical Report
                #17, Character Encoding Model", UTR17,
                <http://www.unicode.org/unicode/reports/tr17/>, August
                2000.

[CRAM-MD5]    Nerenberg, L., "The CRAM-MD5 SASL Mechanism",
                draft-ietf-sasl-crammd5-xx.txt, a work in progress.

[DIGEST-MD5]  Leach, P., C. Newman, and A. Melnikov, "Using Digest
                Authentication as a SASL Mechanism",
                draft-ietf-sasl-rfc2831bis-xx.txt, a work in progress.

[PLAIN]       Zeilenga, K. (Editor), "The Plain SASL Mechanism",
                draft-ietf-sasl-plain-xx.txt, a work in progress.

8. Editor's Address

Kurt Zeilenga
  OpenLDAP Foundation

Email: kurt@OpenLDAP.org

Intellectual Property Rights

The IETF takes no position regarding the validity or scope of any
  intellectual property or other rights that might be claimed to pertain
  to the implementation or use of the technology described in this
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  standards-related documentation can be found in BCP-11.  Copies of
  claims of rights made available for publication and any assurances of

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licenses to be made available, or the result of an attempt made to
  obtain a general license or permission for the use of such proprietary
  rights by implementors or users of this specification can be obtained
  from the IETF Secretariat.

The IETF invites any interested party to bring to its attention any
  copyrights, patents or patent applications, or other proprietary
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  this standard.  Please address the information to the IETF Executive
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Full Copyright

This document and translations of it may be copied and furnished to
  others, and derivative works that comment on or otherwise explain it
  or assist in its implmentation may be prepared, copied, published and
  distributed, in whole or in part, without restriction of any kind,
  provided that the above copyright notice and this paragraph are
  included on all such copies and derivative works.  However, this
  document itself may not be modified in any way, such as by removing
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  developing Internet standards in which case the procedures for
  copyrights defined in the Internet Standards process must be followed,
  or as required to translate it into languages other than English.

Zeilenga                        SASLprep                        [Page 6]

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Code Editor : draft-ietf-sasl-saslprep-xx.txt