Add RFC 4370

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INTERNET-DRAFT Rob Weltman
Intended Category: Standards Track Yahoo!, Inc.
June 2005
LDAP Proxied Authorization Control
draft-weltman-ldapv3-proxy-13.txt
Status of this Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026.
By submitting this Internet-Draft, each author represents that any
applicable patent or other IPR claims of which he or she is aware
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Abstract
This document defines the Lightweight Directory Access Protocol
(LDAP) Proxy Authorization Control. The Proxy Authorization Control
allows a client to request that an operation be processed under a
provided authorization identity instead of as the current
authorization identity associated with the connection.
1. Introduction
Proxy authorization allows a client to request that an operation be
processed under a provided authorization identity instead of as the
current authorization identity associated with the connection. This
document defines support for proxy authorization using the Control
mechanism [RFC 2251]. The Lightweight Directory Access Protocol
[LDAPV3] supports the use of the Simple Authentication and Security
Layer [SASL] for authentication and for supplying an authorization
identity distinct from the authentication identity, where the
authorization identity applies to the whole LDAP session. The Proxy
Authorization Control provides a mechanism for specifying an
Expires December 2005 [Page 1]
PROXIED AUTHORIZATION CONTROL June 2005
authorization identity on a per operation basis, benefiting clients
that need to efficiently perform operations on behalf of multiple
users.
The key words "MUST", "MUST NOT", "SHOULD", "SHOULD NOT", and "MAY"
used in this document are to be interpreted as described in
[KEYWORDS].
2. Publishing support for the Proxy Authorization Control
Support for the Proxy Authorization Control is indicated by the
presence of the Object Identifier (OID) "2.16.840.1.113730.3.4.18" in
the supportedControl attribute [RFC 2252] of a server's root DSE.
3. Proxy Authorization Control
A single Proxy Authorization Control may be included in any search,
compare, modify, add, delete, modify DN or extended operation request
message with the exception of any extension that causes a change in
authentication, authorization, or data confidentiality [RFC 2829],
such as Start TLS [LDAPTLS] as part of the controls field of the
LDAPMessage, as defined in [RFC 2251].
The controlType of the proxy authorization control is
"2.16.840.1.113730.3.4.18".
The criticality MUST be present and MUST be TRUE. This requirement
protects clients from submitting a request that is executed with an
unintended authorization identity.
Clients MUST include the criticality flag and MUST set it to TRUE.
Servers MUST reject any request containing a Proxy Authorization
Control without a criticality flag or with the flag set to FALSE with
a protocolError error. These requirements protect clients from
submitting a request that is executed with an unintended
authorization identity.
The controlValue SHALL be present and contain either an authzId
[AUTH] representing the authorization identity for the request or
empty if an anonymous association is to be used.
The mechanism for determining proxy access rights is specific to the
server's proxy authorization policy.
If the requested authorization identity is recognized by the server,
and the client is authorized to adopt the requested authorization
identity, the request will be executed as if submitted by the proxy
authorization identity, otherwise the result code TBD is returned.
[Note to the IESG/IANA/RFC Editor: the value TBD is to be replaced
with an IANA assigned LDAP Result Code (see RFC 3383 section 3.6]
Expires December 2005 [Page 2]
PROXIED AUTHORIZATION CONTROL June 2005
4. Implementation Considerations
One possible interaction of proxy authorization and normal access
control is illustrated here for the case of search requests. During
evaluation of a search request, an entry which would have been
returned for the search if submitted by the proxy authorization
identity directly may not be returned if the server finds that the
requester does not have the right to assume the requested identity
for searching the entry, even if the entry is within the scope of a
search request under a base DN which does imply such rights. This
means that fewer results, or no results, may be returned compared to
the case where the proxy authorization identity issued the request
directly. An example of such a case may be a system with fine-grained
access control, where the proxy right requester has proxy rights at
the top of a search tree, but not at or below a point or points
within the tree.
5. Security Considerations
The Proxy Authorization Control method is subject to general LDAP
security considerations [RFC 2251] [AUTH] [LDAPTLS]. The control may
be passed over a secure as well as over an insecure channel.
The control allows for an additional authorization identity to be
passed. In some deployments, these identities may contain
confidential information which require privacy protection.
Note that the server is responsible for determining if a proxy
authorization request is to be honored. "Anonymous" users SHOULD NOT
be allowed to assume the identity of others.
6. IANA Considerations
The OID "2.16.840.1.113730.3.4.18" is reserved for the Proxy
Authorization Control. It is to be registered as an LDAP Protocol
Mechanism [RFC 3383].
A result code for the case where the server does not execute a
request using the proxy authorization identity is to be assigned by
the IANA.
7. Copyright
Copyright (C) The Internet Society (2005).
This document is subject to the rights, licenses and restrictions
contained in BCP 78, and except as set forth therein, the authors
retain all their rights.
Expires December 2005 [Page 3]
PROXIED AUTHORIZATION CONTROL June 2005
This document and the information contained herein are provided on an
"AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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 implementation 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
the copyright notice or references to the Internet Society or other
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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.
The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.
8. Normative References
[KEYWORDS] Bradner, Scott, "Key Words for use in RFCs to Indicate
Requirement Levels", draft-bradner-key-words-03.txt, January,
1997.
[LDAPV3] Hodges, J. and R. Morgan, "Lightweight Directory Access
Protocol (v3): Technical Specification", RFC 3377, September
2002.
[SASL] J. Myers, "Simple Authentication and Security Layer (SASL)",
RFC 2222, October 1997
[AUTH] M. Wahl, H. Alvestrand, J. Hodges, R. Morgan, "Authentication
Methods for LDAP", RFC 2829, May 2000
[LDAPTLS] J. Hodges, R. Morgan, M. Wahl, "Lightweight Directory
Access Protocol (v3): Extension for Transport Layer Security",
RFC 2830, May 2000
[RFC 2251] M. Wahl, T. Howes, S. Kille, "Lightweight Directory Access
Protocol (v3)", RFC 2251, December 1997.
[RFC 2252] M. Wahl, A. Coulbeck, T. Howes, S. Kille, "Lightweight
Directory Access Protocol (v3): Attribute Syntax Definitions",
RFC 2252, December 1997
Expires December 2005 [Page 4]
PROXIED AUTHORIZATION CONTROL June 2005
[RFC 2829] M. Wahl, H. Alvestrand, J. Hodges, R. Morgan,
"Authentication Methods for LDAP", RFC 2829, May 2000
[RFC 3383] K. Zeilenga, "Internet Assigned Numbers Authority (IANA)
Considerations for the Lightweight Directory Access Protocol
(LDAP)", RFC 3383, September 2002
9. Author's Address
Rob Weltman
Yahoo!, Inc
701 First Avenue
Sunnyvale, CA 94089
USA
+1 408 349-5504
robw@worldspot.com
10. Acknowledgements
Mark Smith, formerly of Netscape Communications Corp., Mark Wahl,
formerly of Sun Microsystems, Inc, Kurt Zeilenga of OpenLDAP
Foundation, Jim Sermersheim of Novell, and Steven Legg of Adacel have
contributed with reviews of this document.
Expires December 2005 [Page 5]

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@ -49,6 +49,7 @@ rfc3876.txt Returning Matched Values with LDAP (PS)
rfc3909.txt LDAP Cancel Operation (PS)
rfc3928.txt LDAP Client Update Protocol (PS)
rfc4013.txt SASLprep (PS)
rfc4370.txt LDAP Proxied Authorization Control (PS)
rfc4373.txt LBURP (I)
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Network Working Group R. Weltman
Request for Comments: 4370 Yahoo!, Inc.
Category: Standards Track February 2006
Lightweight Directory Access Protocol (LDAP)
Proxied Authorization Control
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2006).
Abstract
This document defines the Lightweight Directory Access Protocol
(LDAP) Proxy Authorization Control. The Proxy Authorization Control
allows a client to request that an operation be processed under a
provided authorization identity instead of under the current
authorization identity associated with the connection.
1. Introduction
Proxy authorization allows a client to request that an operation be
processed under a provided authorization identity instead of under
the current authorization identity associated with the connection.
This document defines support for proxy authorization using the
Control mechanism [RFC2251]. The Lightweight Directory Access
Protocol [LDAPV3] supports the use of the Simple Authentication and
Security Layer [SASL] for authentication and for supplying an
authorization identity distinct from the authentication identity,
where the authorization identity applies to the whole LDAP session.
The Proxy Authorization Control provides a mechanism for specifying
an authorization identity on a per-operation basis, benefiting
clients that need to perform operations efficiently on behalf of
multiple users.
The key words "MUST", "MUST NOT", "SHOULD", "SHOULD NOT", and "MAY"
used in this document are to be interpreted as described in
[KEYWORDS].
Weltman Standards Track [Page 1]
RFC 4370 LDAP Proxied Authorization Control February 2006
2. Publishing Support for the Proxy Authorization Control
Support for the Proxy Authorization Control is indicated by the
presence of the Object Identifier (OID) "2.16.840.1.113730.3.4.18" in
the supportedControl attribute [RFC2252] of a server's root
DSA-specific Entry (DSE).
3. Proxy Authorization Control
A single Proxy Authorization Control may be included in any search,
compare, modify, add, delete, or modify Distinguished Name (DN) or
extended operation request message. The exception is any extension
that causes a change in authentication, authorization, or data
confidentiality [RFC2829], such as Start TLS [LDAPTLS] as part of the
controls field of the LDAPMessage, as defined in [RFC2251].
The controlType of the proxy authorization control is
"2.16.840.1.113730.3.4.18".
The criticality MUST be present and MUST be TRUE. This requirement
protects clients from submitting a request that is executed with an
unintended authorization identity.
Clients MUST include the criticality flag and MUST set it to TRUE.
Servers MUST reject any request containing a Proxy Authorization
Control without a criticality flag or with the flag set to FALSE with
a protocolError error. These requirements protect clients from
submitting a request that is executed with an unintended
authorization identity.
The controlValue SHALL be present and SHALL either contain an authzId
[AUTH] representing the authorization identity for the request or be
empty if an anonymous association is to be used.
The mechanism for determining proxy access rights is specific to the
server's proxy authorization policy.
If the requested authorization identity is recognized by the server,
and the client is authorized to adopt the requested authorization
identity, the request will be executed as if submitted by the proxy
authorization identity; otherwise, the result code 123 is returned.
4. Implementation Considerations
One possible interaction of proxy authorization and normal access
control is illustrated here. During evaluation of a search request,
an entry that would have been returned for the search (if submitted
by the proxy authorization identity directly) may not be returned if
Weltman Standards Track [Page 2]
RFC 4370 LDAP Proxied Authorization Control February 2006
the server finds that the requester does not have the right to assume
the requested identity for searching the entry, even if the entry is
within the scope of a search request under a base DN that does imply
such rights. This means that fewer results, or no results, may be
returned than would be if the proxy authorization identity issued the
request directly. An example of such a case may be a system with
fine-grained access control, where the proxy right requester has
proxy rights at the top of a search tree, but not at or below a point
or points within the tree.
5. Security Considerations
The Proxy Authorization Control method is subject to general LDAP
security considerations [RFC2251] [AUTH] [LDAPTLS]. The control may
be passed over a secure channel as well as over an insecure channel.
The control allows for an additional authorization identity to be
passed. In some deployments, these identities may contain
confidential information that requires privacy protection.
Note that the server is responsible for determining if a proxy
authorization request is to be honored. "Anonymous" users SHOULD NOT
be allowed to assume the identity of others.
6. IANA Considerations
The OID "2.16.840.1.113730.3.4.18" is reserved for the Proxy
Authorization Control. It has been registered as an LDAP Protocol
Mechanism [RFC3383].
A result code (123) has been assigned by the IANA for the case where
the server does not execute a request using the proxy authorization
identity.
7. Acknowledgements
Mark Smith, formerly of Netscape Communications Corp., Mark Wahl,
formerly of Sun Microsystems, Inc., Kurt Zeilenga of OpenLDAP
Foundation, Jim Sermersheim of Novell, and Steven Legg of Adacel have
contributed with reviews of this document.
Weltman Standards Track [Page 3]
RFC 4370 LDAP Proxied Authorization Control February 2006
8. Normative References
[KEYWORDS] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[LDAPV3] Hodges, J. and R. Morgan, "Lightweight Directory Access
Protocol (v3): Technical Specification", RFC 3377,
September 2002.
[SASL] Myers, J., "Simple Authentication and Security Layer
(SASL)", RFC 2222, October 1997.
[AUTH] Wahl, M., Alvestrand, H., Hodges, J., and R. Morgan,
"Authentication Methods for LDAP", RFC 2829, May 2000.
[LDAPTLS] Hodges, J., Morgan, R., and M. Wahl, "Lightweight
Directory Access Protocol (v3): Extension for Transport
Layer Security", RFC 2830, May 2000.
[RFC2251] Wahl, M., Howes, T., and S. Kille, "Lightweight Directory
Access Protocol (v3)", RFC 2251, December 1997.
[RFC2252] Wahl, M., Coulbeck, A., Howes, T., and S. Kille,
"Lightweight Directory Access Protocol (v3): Attribute
Syntax Definitions", RFC 2252, December 1997.
[RFC2829] Wahl, M., Alvestrand, H., Hodges, J., and R. Morgan,
"Authentication Methods for LDAP", RFC 2829, May 2000.
[RFC3383] Zeilenga, K., "Internet Assigned Numbers Authority (IANA)
Considerations for the Lightweight Directory Access
Protocol (LDAP)", BCP 64, RFC 3383, September 2002.
Author's Address
Rob Weltman
Yahoo!, Inc.
701 First Avenue
Sunnyvale, CA 94089
USA
Phone: +1 408 349-5504
EMail: robw@worldspot.com
Weltman Standards Track [Page 4]
RFC 4370 LDAP Proxied Authorization Control February 2006
Full Copyright Statement
Copyright (C) The Internet Society (2006).
This document is subject to the rights, licenses and restrictions
contained in BCP 78, and except as set forth therein, the authors
retain all their rights.
This document and the information contained herein are provided on an
"AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Intellectual Property
The IETF takes no position regarding the validity or scope of any
Intellectual Property Rights or other rights that might be claimed to
pertain to the implementation or use of the technology described in
this document or the extent to which any license under such rights
might or might not be available; nor does it represent that it has
made any independent effort to identify any such rights. Information
on the procedures with respect to rights in RFC documents can be
found in BCP 78 and BCP 79.
Copies of IPR disclosures made to the IETF Secretariat and any
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attempt made to obtain a general license or permission for the use of
such proprietary rights by implementers or users of this
specification can be obtained from the IETF on-line IPR repository at
http://www.ietf.org/ipr.
The IETF invites any interested party to bring to its attention any
copyrights, patents or patent applications, or other proprietary
rights that may cover technology that may be required to implement
this standard. Please address the information to the IETF at
ietf-ipr@ietf.org.
Acknowledgement
Funding for the RFC Editor function is provided by the IETF
Administrative Support Activity (IASA).
Weltman Standards Track [Page 5]

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@ -205,7 +205,7 @@ typedef struct ldapcontrol {
/* LDAP Controls */
/* standard track controls */
#define LDAP_CONTROL_MANAGEDSAIT "2.16.840.1.113730.3.4.2" /* RFC 3296 */
#define LDAP_CONTROL_PROXY_AUTHZ "2.16.840.1.113730.3.4.18" /* RFC TBD */
#define LDAP_CONTROL_PROXY_AUTHZ "2.16.840.1.113730.3.4.18" /* RFC 4370 */
#define LDAP_CONTROL_SUBENTRIES "1.3.6.1.4.1.4203.1.10.1" /* RFC 3672 */
#define LDAP_CONTROL_VALUESRETURNFILTER "1.2.826.0.1.334810.2.3"/* RFC 3876 */