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Network Working Group W. Sanchez | |||
Internet-Draft C. Daboo | |||
Expires: May 4, 2009 Apple Inc. | |||
October 31, 2008 | |||
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WebDAV Current Principal Extension | |||
draft-sanchez-webdav-current-principal-02 | |||
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Status of This Memo | |||
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By submitting this Internet-Draft, each author represents that any | |||
applicable patent or other IPR claims of which he or she is aware | |||
have been or will be disclosed, and any of which he or she becomes | |||
aware will be disclosed, in accordance with Section 6 of BCP 79. | |||
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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. | |||
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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." | |||
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The list of current Internet-Drafts can be accessed at | |||
http://www.ietf.org/ietf/1id-abstracts.txt. | |||
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The list of Internet-Draft Shadow Directories can be accessed at | |||
http://www.ietf.org/shadow.html. | |||
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This Internet-Draft will expire on May 4, 2009. | |||
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Abstract | |||
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This specification defines a new WebDAV property that allows clients | |||
to quickly determine the principal corresponding to the current | |||
authenticated user. | |||
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Sanchez & Daboo Expires May 4, 2009 [Page 1] | |||
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Internet-Draft WebDAV Current Principal October 2008 | |||
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Table of Contents | |||
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1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 | |||
2. Conventions Used in This Document . . . . . . . . . . . . . . . 3 | |||
3. DAV:current-user-principal . . . . . . . . . . . . . . . . . . 4 | |||
4. Security Considerations . . . . . . . . . . . . . . . . . . . . 5 | |||
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5 | |||
6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 5 | |||
7. Normative References . . . . . . . . . . . . . . . . . . . . . 5 | |||
Appendix A. Change History (to be removed prior to | |||
publication as an RFC) . . . . . . . . . . . . . . . . 5 | |||
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Sanchez & Daboo Expires May 4, 2009 [Page 2] | |||
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Internet-Draft WebDAV Current Principal October 2008 | |||
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1. Introduction | |||
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WebDAV [RFC4918] is an extension to HTTP [RFC2616] to support | |||
improved document authoring capabilities. The WebDAV Access Control | |||
Protocol ("WebDAV ACL") [RFC3744] extension adds access control | |||
capabilities to WebDAV. It introduces the concept of a "principal" | |||
resource, which is used to represent information about authenticated | |||
entities on the system. | |||
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Some clients have a need to determine the [RFC3744] principal that a | |||
server is associating with the currently authenticated HTTP user. | |||
While [RFC3744] defines a DAV:current-user-privilege-set property for | |||
retrieving the privileges granted to that principal, there is no | |||
recommended way to identify the principal in question, which is | |||
necessary to perform other useful operations. For example, a client | |||
may wish to determine which groups the current user is a member of, | |||
or modify a property of the principal resource associated with the | |||
current user. | |||
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The DAV:principal-match REPORT provides some useful functionality, | |||
but there are common situations where the results from that query can | |||
be ambiguous. For example, not only is an individual user principal | |||
returned, but also every group principal that the user is a member | |||
of, and there is no clear way to distinguish which is which. | |||
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This specification proposes an extension to WebDAV ACL that adds a | |||
DAV:current-user-principal property to resources under access control | |||
on the server. This property provides a URL to a principal resource | |||
corresponding to the currently authenticated user. This allows a | |||
client to "bootstrap" itself by performing additional queries on the | |||
principal resource to obtain additional information from that | |||
resource, which is the purpose of this extension. Note that while it | |||
is possible for multiple URLs to refer to the same principal | |||
resource, or for multiple principal resources to correspond to a | |||
single principal, this specification only allows for a single http(s) | |||
URL in the DAV:current-user-principal property. If a client wishes | |||
to obtain alternate URLs for the principal, it can query the | |||
principal resource for this information; it is not the purpose of | |||
this extension to provide a complete list of such URLs, but simply to | |||
provide a means to locate a resource which contains that (and other) | |||
information. | |||
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2. Conventions Used in This Document | |||
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The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", | |||
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this | |||
document are to be interpreted as described in [RFC2119]. | |||
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Sanchez & Daboo Expires May 4, 2009 [Page 3] | |||
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Internet-Draft WebDAV Current Principal October 2008 | |||
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When XML element types in the namespace "DAV:" are referenced in this | |||
document outside of the context of an XML fragment, the string "DAV:" | |||
will be prefixed to the element type names. | |||
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Processing of XML by clients and servers MUST follow the rules | |||
defined in Section 17 of WebDAV [RFC4918]. | |||
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Some of the declarations refer to XML elements defined by WebDAV | |||
[RFC4918]. | |||
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3. DAV:current-user-principal | |||
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Name: current-user-principal | |||
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Namespace: DAV: | |||
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Purpose: Indicates a URL for the currently authenticated user's | |||
principal resource on the server. | |||
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Value: A single DAV:href or DAV:unauthenticated element. | |||
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Protected: This property is computed on a per-request basis, and | |||
therefore is protected. | |||
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Description: The DAV:current-user-principal property contains either | |||
a DAV:href or DAV:unauthenticated XML element. The DAV:href | |||
element contains a URL to a principal resource corresponding to | |||
the currently authenticated user. That URL MUST be one of the | |||
URLs in the DAV:principal-URL or DAV:alternate-URI-set properties | |||
defined on the principal resource and MUST be an http(s) scheme | |||
URL. When authentication has not been done or has failed, this | |||
property MUST contain the DAV:unauthenticated pseudo-principal. | |||
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In some cases there may be multiple principal resources | |||
corresponding to the same authenticated principal. In that case | |||
the server is free to choose any one of the principal resource | |||
URIs for the value of the DAV:current-user-principal property. | |||
However, servers SHOULD be consistent and use the same principal | |||
resource URI for each authenticated principal. | |||
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COPY/MOVE behavior: This property is computed on a per-request | |||
basis, and is thus never copied or moved. | |||
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Definition: | |||
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<!ELEMENT current-user-principal (unauthenticated | href)> | |||
<!-- href value: a URL to a principal resource --> | |||
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Sanchez & Daboo Expires May 4, 2009 [Page 4] | |||
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Internet-Draft WebDAV Current Principal October 2008 | |||
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Example: | |||
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<D:current-user-principal xmlns:D="DAV:"> | |||
<D:href>/principals/users/cdaboo</D:href> | |||
</D:current-user-principal> | |||
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4. Security Considerations | |||
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This specification does not introduce any additional security issues | |||
beyond those defined for HTTP [RFC2616], WebDAV [RFC4918] and WebDAV | |||
ACL [RFC3744]. | |||
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5. IANA Considerations | |||
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This document does not require any actions on the part of IANA. | |||
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6. Acknowledgments | |||
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This specification is based on discussions that took place within the | |||
Calendaring and Scheduling Consortium's CalDAV Technical Committee. | |||
The authors thank the participants of that group for their input. | |||
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The authors thank Julian Reschke for his valuable input via the | |||
WebDAV working group mailing list. | |||
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7. Normative References | |||
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[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate | |||
Requirement Levels", BCP 14, RFC 2119, March 1997. | |||
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[RFC2616] Fielding, R., Gettys, J., Mogul, J., Frystyk, H., | |||
Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext | |||
Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999. | |||
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[RFC3744] Clemm, G., Reschke, J., Sedlar, E., and J. Whitehead, "Web | |||
Distributed Authoring and Versioning (WebDAV) | |||
Access Control Protocol", RFC 3744, May 2004. | |||
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[RFC4918] Dusseault, L., "HTTP Extensions for Web Distributed | |||
Authoring and Versioning (WebDAV)", RFC 4918, June 2007. | |||
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Appendix A. Change History (to be removed prior to publication as an | |||
RFC) | |||
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Changes from -00: | |||
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1. Changed DAV:current-user-principal-resource to DAV:current-user- | |||
principal. | |||
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Sanchez & Daboo Expires May 4, 2009 [Page 5] | |||
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Internet-Draft WebDAV Current Principal October 2008 | |||
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2. Correct DAV:current-user-principal element definition to use | |||
valid XML and not use the "DAV:" prefix for children. | |||
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3. Typo "DAV:unauthenticed" should be spelled "DAV:unauthenticated". | |||
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Authors' Addresses | |||
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Wilfredo Sanchez | |||
Apple Inc. | |||
1 Infinite Loop | |||
Cupertino, CA 95014 | |||
USA | |||
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EMail: wsanchez@wsanchez.net | |||
URI: http://www.apple.com/ | |||
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Cyrus Daboo | |||
Apple Inc. | |||
1 Infinite Loop | |||
Cupertino, CA 95014 | |||
USA | |||
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EMail: cyrus@daboo.name | |||
URI: http://www.apple.com/ | |||
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Sanchez & Daboo Expires May 4, 2009 [Page 6] | |||
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Internet-Draft WebDAV Current Principal October 2008 | |||
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Full Copyright Statement | |||
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Copyright (C) The IETF Trust (2008). | |||
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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. | |||
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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, THE IETF TRUST 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. | |||
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Intellectual Property | |||
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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. | |||
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Copies of IPR disclosures made to the IETF Secretariat and any | |||
assurances of 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 implementers or users of this | |||
specification can be obtained from the IETF on-line IPR repository at | |||
http://www.ietf.org/ipr. | |||
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The IETF invites any interested party to bring to its attention any | |||
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Sanchez & Daboo Expires May 4, 2009 [Page 7] | |||
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