Requirements for NFSv4 Multi-Domain Namespace Deployment
RFC 8000
Internet Engineering Task Force (IETF) W. Adamson
Request for Comments: 8000 NetApp
Category: Standards Track N. Williams
ISSN: 2070-1721 Cryptonector
November 2016
Requirements for NFSv4 Multi-Domain Namespace Deployment
Abstract
This document presents requirements for the deployment of the NFSv4
protocols for the construction of an NFSv4 file namespace in
environments with multiple NFSv4 Domains. To participate in an NFSv4
multi-domain file namespace, the server must offer a multi-domain-
capable file system and support RPCSEC_GSS for user authentication.
In most instances, the server must also support identity-mapping
services.
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
http://www.rfc-editor.org/info/rfc8000.
Copyright Notice
Copyright (c) 2016 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
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Adamson & Williams Standards Track [Page 1]
RFC 8000 Multi NFSv4 Domain November 2016
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Federated File System . . . . . . . . . . . . . . . . . . . . 5
4. Identity Mapping . . . . . . . . . . . . . . . . . . . . . . 6
4.1. NFSv4 Server Identity Mapping . . . . . . . . . . . . . . 6
4.2. NFSv4 Client Identity Mapping . . . . . . . . . . . . . . 7
5. Stand-Alone NFSv4 Domain Deployment Examples . . . . . . . . 7
5.1. AUTH_SYS with Stringified UID/GID . . . . . . . . . . . . 7
5.2. AUTH_SYS with Name@domain . . . . . . . . . . . . . . . . 8
5.3. RPCSEC_GSS with Name@domain . . . . . . . . . . . . . . . 8
6. Multi-Domain Constraints to the NFSv4 Protocol . . . . . . . 9
6.1. Name@domain Constraints . . . . . . . . . . . . . . . . . 9
6.1.1. NFSv4 Domain and DNS Services . . . . . . . . . . . . 9
6.1.2. NFSv4 Domain and Name Services . . . . . . . . . . . 10
6.2. RPC Security Constraints . . . . . . . . . . . . . . . . 10
6.2.1. NFSv4 Domain and Security Services . . . . . . . . . 11
7. Stand-Alone Examples in an NFSv4 Multi-Domain Deployment . . 11
8. Resolving Multi-Domain Authorization Information . . . . . . 12
9. Security Considerations . . . . . . . . . . . . . . . . . . . 13
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 14
10.1. Normative References . . . . . . . . . . . . . . . . . . 14
10.2. Informative References . . . . . . . . . . . . . . . . . 15
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 17
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 17
1. Introduction
The NFSv4 protocols NFSv4.0 [RFC7530], NFSv4.1 [RFC5661], and NFSv4.2
[RFC7862] introduce the concept of an NFS Domain. An NFSv4 Domain is
defined as a set of users and groups using the NFSv4 name@domain user
and group identification syntax with the same specified @domain.
Previous versions of the NFS protocol, such as NFSv3 [RFC1813], use
the UNIX-centric user identification mechanism of numeric user and
group ID for the uid3 and gid3 [RFC1813] file attributes and for
identity in the authsys_parms AUTH_SYS credential defined in the Open
Network Computing (ONC) Remote Procedure Call (RPC) protocol
[RFC5531]. Section 6.1 of [RFC2624] notes that the use of UNIX-
centric numeric IDs limits the scale of NFS to large local work
groups. UNIX-centric numeric IDs are not unique across NFSv3
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