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RFC 7612

Lightweight Directory Access Protocol (LDAP): Schema for Printer Services

Pages: 54
Obsoletes:  3712
Part 3 of 3 – Pages 42 to 54
First   Prev   None

Top   ToC   Page 42   prevText
5.  Definition of Syntaxes

   No new attribute syntaxes are defined by this document.

   The attribute types defined in Section 4 of this document reference
   syntax OIDs defined in Section 3 of [RFC4517], which are summarized

   Syntax OID                      Syntax Description
   ------------------------------  -------------------------------    Boolean   DirectoryString (UTF-8 [STD63])   Integer

6.  Definition of Matching Rules

   No new matching rules are defined by this document.

   The attribute types defined in Section 4 of this document reference
   matching rules defined in Section 4 of [RFC4517], which are
   summarized below:

   Matching Rule OID               Matching Rule Name          Usage
   -----------------------------   ------------------          --------                       booleanMatch                EQUALITY                        caseIgnoreMatch             EQUALITY                       integerMatch                EQUALITY                       integerOrderingMatch        ORDERING                        caseIgnoreSubstringsMatch   SUBSTR

7.  IANA Considerations

   This document does not define any new syntaxes or matching rules.

   This document defines a few new attribute types that have been
   registered by IANA per this document (see Section 7.1 below).

   All of the object classes and most of the attribute types described
   in this document were registered by IANA when RFC 3712 was published
   (see Section 7.2 below).
Top   ToC   Page 43
7.1.  Registration of Attribute Types

   The following Attribute Type OIDs have been assigned by the IEEE-ISTO
   PWG (see Section 1.3.2) and have been registered by IANA.

   Subject:  Request for Object Identifier Descriptor Registration

   Descriptor (short name):  see table below

   Object Identifier:  see table below

   Person & email address to contact for further information:  see below

   Usage:  attribute type

   Specification:  RFC 7612 (this document)

   Author/Change Controller:

      Ira McDonald
      High North Inc.
      221 Ridge Ave.
      Grand Marais, MI  49839
      United States
      Phone: +1 906-494-2434


   Attribute Type                                OID
   ------------------------------------          ----------------------
Top   ToC   Page 44
7.2.  Object Classes and Attribute Types from RFC 3712

   This section is strictly informative.  None of the LDAP OIDs listed
   in this section have been re-registered by IANA.

   The following Object Class OIDs were assigned by IBM (see
   Section 1.3.1) and were already registered by IANA when RFC 3712 was

   Object Class                                  OID
   ------------------------------------          ----------------

   The following Attribute Type OIDs were assigned by IBM (see
   Section 1.3.1) and were already registered by IANA when RFC 3712 was

   Attribute Type                                OID
   ------------------------------------          -----------------
Top   ToC   Page 45

8.  Internationalization Considerations

   All text string attributes defined in this document of syntax
   'DirectoryString' [RFC4517] have values that are encoded in UTF-8
   [STD63], as required by [RFC4517].

   A language tag [BCP47] for all of the text string attributes defined
   in this document is contained in the
   printer-natural-language-configured attribute.

   Therefore, all object classes defined in this document conform to the
   IETF Policy on Character Sets and Languages [BCP18].

   Note: For interoperability and consistent text display, values of
   attributes defined in this document (a) SHOULD be normalized as
   recommended in "Unicode Format for Network Interchange" [RFC5198];
   (b) SHOULD NOT contain DEL or any C0 or C1 control characters except
   for HT, CR, and LF; (c) SHOULD only contain CR and LF characters
   together (not as singletons); and (d) SHOULD NOT contain HT, CR, or
   LF characters in names, e.g., printer-name and printer-aliases.

9.  Security Considerations

   See [RFC4513] for detailed guidance on authentication methods for
   LDAP and the use of TLS/1.2 [RFC5246] to supply connection
   confidentiality and data integrity for LDAP sessions.

   As with any LDAP schema, it is important to protect specific entries
   and attributes with the appropriate access control.  It is
   particularly important that only administrators can modify entries
   defined in this LDAP Printer schema.  Otherwise, an LDAP client might
   be fooled into diverting print service requests from the original
   Printer (or spooler) to a malicious intruder's host system, thus
   exposing the information in printed documents.
Top   ToC   Page 46
   Note: Security vulnerabilities can arise if DEL or any C0 or C1
   control characters are included in names, e.g., printer-name or

   For additional security considerations regarding deploying Printers
   in an IPP environment, see Section 8 of [RFC2911].

10.  References

10.1.  Normative References

   [BCP47]      Phillips, A. and M. Davis, "Matching of Language Tags",
                BCP 47, RFC 4647, September 2006.

                Phillips, A., Ed., and M. Davis, Ed., "Tags for
                Identifying Languages", BCP 47, RFC 5646,
                September 2009.


   [IANACHAR]   Internet Assigned Numbers Authority (IANA) registry
                "Character Sets",

   [IANAIPP]    Internet Assigned Numbers Authority (IANA) registry
                "Internet Printing Protocol (IPP) Registrations",

   [IANAMIME]   Internet Assigned Numbers Authority (IANA) registry
                "Media Types", <

   [PWG5100.5]  Carney, D., Hastings, T., and P. Zehler, "IPP Document
                Object", PWG 5100.5-2003, October 2003,

   [PWG5100.6]  Zehler, P., Herriot, R., and K. Ocke, "IPP Page
                Overrides", PWG 5100.6-2003, October 2003,

   [PWG5100.11] Hastings, T. and D. Fullman, "IPP Job and Printer
                Extensions - Set 2 (JPS2)", PWG 5100.11-2010,
                October 2010, <>.

   [PWG5100.12] Bergman, R., Lewis, H., McDonald, I., and M. Sweet, "IPP
                Version 2.0 Second Edition (IPP/2.0 SE)",
                PWG 5100.12-2011, February 2011,
Top   ToC   Page 47
   [PWG5100.13] Sweet, M., McDonald, I., and P. Zehler, "IPP Job and
                Printer Extensions - Set 3 (JPS3)", PWG 5100.13-2012,
                July 2012, <>.

   [PWG5100.14] Sweet, M., McDonald, I., Mitchell, A., and J. Hutchings,
                "IPP Everywhere", PWG 5100.14-2013, January 2013,

   [PWG5101.1]  Sweet, M., Bergman, R., and T. Hastings, "PWG Media
                Standardized Names 2.0 (MSN2)", PWG 5101.1-2013,
                March 2013, <>.

   [PWG5107.2]  McDonald, I., "PWG Command Set Format for IEEE 1284
                Device ID v1.0", PWG 5107.2-2010, May 2010,

   [RFC2119]    Bradner, S., "Key words for use in RFCs to Indicate
                Requirement Levels", BCP 14, RFC 2119,
                DOI 10.17487/RFC2119, March 1997,

   [RFC2617]    Franks, J., Hallam-Baker, P., Hostetler, J., Lawrence,
                S., Leach, P., Luotonen, A., and L. Stewart, "HTTP
                Authentication: Basic and Digest Access Authentication",
                RFC 2617, DOI 10.17487/RFC2617, June 1999,

   [RFC2707]    Bergman, R., Hastings, T., Isaacson, S., and H. Lewis,
                "Job Monitoring MIB - V1.0", RFC 2707,
                DOI 10.17487/RFC2707, November 1999,

   [RFC2911]    Hastings, T., Ed., Herriot, R., deBry, R., Isaacson, S.,
                and P. Powell, "Internet Printing Protocol/1.1: Model
                and Semantics", RFC 2911, DOI 10.17487/RFC2911,
                September 2000,

   [RFC2926]    Kempf, J., Moats, R., and P. St. Pierre, "Conversion of
                LDAP Schemas to and from SLP Templates", RFC 2926,
                DOI 10.17487/RFC2926, September 2000,

   [RFC3510]    Herriot, R. and I. McDonald, "Internet Printing
                Protocol/1.1: IPP URL Scheme", RFC 3510,
                DOI 10.17487/RFC3510, April 2003,
Top   ToC   Page 48
   [RFC3805]    Bergman, R., Lewis, H., and I. McDonald, "Printer
                MIB v2", RFC 3805, DOI 10.17487/RFC3805, June 2004,

   [RFC3987]    Duerst, M. and M. Suignard, "Internationalized Resource
                Identifiers (IRIs)", RFC 3987, DOI 10.17487/RFC3987,
                January 2005, <>.

   [RFC3995]    Herriot, R. and T. Hastings, "Internet Printing Protocol
                (IPP): Event Notifications and Subscriptions", RFC 3995,
                DOI 10.17487/RFC3995, March 2005,

   [RFC4122]    Leach, P., Mealling, M., and R. Salz, "A Universally
                Unique IDentifier (UUID) URN Namespace", RFC 4122,
                DOI 10.17487/RFC4122, July 2005,

   [RFC4510]    Zeilenga, K., Ed., "Lightweight Directory Access
                Protocol (LDAP): Technical Specification Road Map",
                RFC 4510, DOI 10.17487/RFC4510, June 2006,

   [RFC4513]    Harrison, R., Ed., "Lightweight Directory Access
                Protocol (LDAP): Authentication Methods and Security
                Mechanisms", RFC 4513, DOI 10.17487/RFC4513, June 2006,

   [RFC4517]    Legg, S., Ed., "Lightweight Directory Access Protocol
                (LDAP): Syntaxes and Matching Rules", RFC 4517,
                DOI 10.17487/RFC4517, June 2006,

   [RFC4524]    Zeilenga, K., Ed., "COSINE LDAP/X.500 Schema", RFC 4524,
                DOI 10.17487/RFC4524, June 2006,

   [RFC5198]    Klensin, J. and M. Padlipsky, "Unicode Format for
                Network Interchange", RFC 5198, DOI 10.17487/RFC5198,
                March 2008, <>.

   [RFC5246]    Dierks, T. and E. Rescorla, "The Transport Layer
                Security (TLS) Protocol Version 1.2", RFC 5246,
                DOI 10.17487/RFC5246, August 2008,
Top   ToC   Page 49
   [RFC5280]    Cooper, D., Santesson, S., Farrell, S., Boeyen, S.,
                Housley, R., and W. Polk, "Internet X.509 Public Key
                Infrastructure Certificate and Certificate Revocation
                List (CRL) Profile", RFC 5280, DOI 10.17487/RFC5280,
                May 2008, <>.

   [RFC5870]    Mayrhofer, A. and C. Spanring, "A Uniform Resource
                Identifier for Geographic Locations ('geo' URI)",
                RFC 5870, DOI 10.17487/RFC5870, June 2010,

   [RFC6818]    Yee, P., "Updates to the Internet X.509 Public Key
                Infrastructure Certificate and Certificate Revocation
                List (CRL) Profile", RFC 6818, DOI 10.17487/RFC6818,
                January 2013, <>.

   [RFC7235]    Fielding, R., Ed., and J. Reschke, Ed., "Hypertext
                Transfer Protocol (HTTP/1.1): Authentication", RFC 7235,
                DOI 10.17487/RFC7235, June 2014,

   [RFC7472]    McDonald, I. and M. Sweet, "Internet Printing Protocol
                (IPP) over HTTPS Transport Binding and the 'ipps' URI
                Scheme", RFC 7472, DOI 10.17487/RFC7472, March 2015,

   [STD63]      Yergeau, F., "UTF-8, a transformation format of ISO
                10646", STD 63, RFC 3629, November 2003,

   [STD66]      Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
                Resource Identifier (URI): Generic Syntax", STD 66, RFC
                3986, January 2005,
Top   ToC   Page 50
10.2.  Informative References

   [BCP13]      Freed, N. and J. Klensin, "Multipurpose Internet Mail
                Extensions (MIME) Part Four: Registration Procedures",
                BCP 13, RFC 4289, December 2005.

                Freed, N., Klensin, J., and T. Hansen, "Media Type
                Specifications and Registration Procedures", BCP 13,
                RFC 6838, January 2013.


   [BCP18]      Alvestrand, H., "IETF Policy on Character Sets and
                Languages", BCP 18, RFC 2277, January 1998,

   [BCP19]      Freed, N. and J. Postel, "IANA Charset Registration
                Procedures", BCP 19, RFC 2978, October 2000,

   [RFC1179]    McLaughlin, L., "Line printer daemon protocol",
                RFC 1179, DOI 10.17487/RFC1179, August 1990,

   [RFC1951]    Deutsch, P., "DEFLATE Compressed Data Format
                Specification version 1.3", RFC 1951,
                DOI 10.17487/RFC1951, May 1996,

   [RFC1952]    Deutsch, P., "GZIP file format specification
                version 4.3", RFC 1952, DOI 10.17487/RFC1952, May 1996,

   [RFC1977]    Schryver, V., "PPP BSD Compression Protocol", RFC 1977,
                DOI 10.17487/RFC1977, August 1996,

   [RFC2079]    Smith, M., "Definition of an X.500 Attribute Type and an
                Object Class to Hold Uniform Resource Identifiers
                (URIs)", RFC 2079, DOI 10.17487/RFC2079, January 1997,

   [RFC2566]    deBry, R., Hastings, T., Herriot, R., Isaacson, S., and
                P. Powell, "Internet Printing Protocol/1.0: Model and
                Semantics", RFC 2566, DOI 10.17487/RFC2566, April 1999,
Top   ToC   Page 51
   [RFC2608]    Guttman, E., Perkins, C., Veizades, J., and M. Day,
                "Service Location Protocol, Version 2", RFC 2608,
                DOI 10.17487/RFC2608, June 1999,

   [RFC3712]    Fleming, P. and I. McDonald, "Lightweight Directory
                Access Protocol (LDAP): Schema for Printer Services",
                RFC 3712, DOI 10.17487/RFC3712, February 2004,

   [RFC4559]    Jaganathan, K., Zhu, L., and J. Brezak, "SPNEGO-based
                Kerberos and NTLM HTTP Authentication in Microsoft
                Windows", RFC 4559, DOI 10.17487/RFC4559, June 2006,

   [SLPPRT20]   IANA, "Service Location Protocol, Version 2 (SLPv2)
Top   ToC   Page 52
Appendix A.  Changes since RFC 3712

   1) Added many editorial corrections and clarifications

      - corrected typos, missing words, and ambiguous sentences;

      - replaced lowercase 'printer' with titlecase 'Printer' for
        readability and consistency with IETF and IEEE-ISTO PWG IPP
        standards usage;

      - added implementation notes;

      - updated and added references.

   2) Deleted length restrictions from formal definitions of
      DirectoryString syntax attributes

      - replaced with notes recommending length restrictions for
        compatibility with existing implementations of [RFC3712] and
        underlying string length limits in [RFC2707], [RFC2911],
        [RFC3805], [PWG5107.2], [PWG5100.13], and [PWG5100.14].

   3) Added new Printer attributes defined in [PWG5107.2], [PWG5100.13],
      and [PWG5100.14] (see Section 7.1)

      - updated the table of Printer attributes and source documents in
        Section 4 ("Definition of Attribute Types");

      - added support for IEEE-ISTO PWG "IPP Everywhere" [PWG5100.14]

   4) Added implementation note to Section 4 about string encodings

      - added discussion of 'List of xxx' and 'One of xxx' encodings;

      - stated that any of these attributes can be represented as
        multiple instances (i.e., to avoid length overflow).

   5) Improved comma-delimited examples of string attributes

      - added both single-valued and multi-valued examples.
Top   ToC   Page 53
   6) Clarified use of printer-xri-supported and
      printer-resolution-supported attributes, and their corresponding
      field delimiters

      - added note in Section 4 ("Definition of Attribute Types") to
        explain the origin of the different field delimiters;

      - added examples to show optional *trailing* whitespace after '<'
        delimiters in printer-xri-supported;

      - added examples to show optional *trailing* whitespace after '>'
        delimiters in printer-resolution-supported.

   7) Clarified Section 8 ("Internationalization Considerations")

      - added note about Net-Unicode [RFC5198] and avoiding use of C0
        and C1 control characters.

   8) Clarified Section 9 ("Security Considerations")

      - added note about security vulnerabilities caused by use of DEL
        or any C0 or C1 control characters in names.

   9) Clarified terms and abbreviations

      - renamed Section 2 ("Conventions Used in This Document");

      - added Section 2.1 ("Requirements Language");

      - added Section 2.2 ("LDAP Schema Descriptions");

      - added Section 2.3 ("Abbreviations").
Top   ToC   Page 54

   The authors wish to acknowledge significant contributions from Ken
   Jones and Harry Lewis and excellent comments from Patrik Faltstrom,
   Ryan Moats, Robert Moore, Lee Rafalow, Kimberly Reger, and Kurt
   Zeilenga during the development of the original LDAP Printer schema

   The authors wish to acknowledge excellent comments from Nevil
   Brownlee, Barry Leiba, Alexey Melnikov, Tom Petch, and Mike Sweet
   during the development of this current version of the LDAP Printer

   Thanks to the members of the IEEE-ISTO PWG IPP Working Group, for
   their review comments and help in preparing this document.

Authors' Addresses

   Pat Fleming
   51796 171 Ave.
   Pine Island, MN  55963
   United States

   Phone: +1 507-356-8277

   Ira McDonald
   High North Inc.
   221 Ridge Ave.
   Grand Marais, MI  49839
   United States

   Phone: +1 906-494-2434