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RFC2241 - DHCP Options for Novell Directory Services

王朝other·作者佚名  2008-05-31
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Network Working Group D. Provan

Request for Comments: 2241 Novell, Inc.

Category: Standards Track November 1997

DHCP Options for Novell Directory Services

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 (1997). All Rights Reserved.

Abstract

This document defines three new DHCP options for delivering

configuration information to clients of the Novell Directory

Services. The first option carries a list of NDS servers. The second

option carries the name of the client's NDS tree. The third carries

the initial NDS context. These three options provide an NDS client

with enough information to connect to an NDS tree without manual

configuration of the client.

1. IntrodUCtion

Novell Directory Services is a distributed, replicated, hierarchical

database of objects representing network resources such as nodes,

services, users, and applications. An NDS client must be able to

locate an NDS server in order to authenticate itself to the network

and gain Access to the database. In addition, the node's user is

better served if the NDS client's attention is focused on the area of

the NDS database likely to be of the most interest to the user. This

specification describes DHCP options [1] that carry NDS information

to TCP/IP clients of NDS. The first option, the NDS Servers Option,

carries a list of NDS servers. The other two options, the NDS Tree

Name Option and the NDS Context Option, provide the client with a

default context within the NDS database.

The NDS Tree Name Option and the NDS Context Option carry 16-bit

Unicode text encoded into an octet stream using UTF-8 [4]. A complete

DHCP implementation can represent of the entire Unicode character set

supported by NDS. At the same time, 7-bit ASCII text is unchanged by

the UTF-8 transformation. In environments where the NDS tree name and

context are restricted to the range of 7-bit ASCII characters, ASCII-

only DHCP clients and servers can support these options by using the

ASCII text as the UTF-8 encoded data.

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. [2]

2. NDS Servers Option

This option specifies one or more NDS servers for the client to

contact for access to the NDS database. Servers SHOULD be listed in

order of preference.

The code for this option is 85. The minimum length of this option is

4 octets, and the length MUST be a multiple of 4.

Code Len Address 1 Address 2

+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+--

85 n a1 a2 a3 a4 a1 a2 a3 a4 ...

+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+--

3. NDS Tree Name Option

This option specifies the name of the NDS tree the client will be

contacting. NDS tree names are 16-bit Unicode strings. For

transmission in the NDS Tree Name Option, an NDS tree name is

transformed into octets using UTF-8. The string should NOT be zero

terminated.

The code for this option is 86. The maximum possible length for this

option is 255 bytes.

Code Len NDS Tree Name

+----+----+----+----+----+----+--

86 n c1 c2 c3 c4 ...

+----+----+----+----+----+----+--

4. NDS Context Option

This option specifies the initial NDS context the client should use.

NDS contexts are 16-bit Unicode strings. For transmission in the NDS

Context Option, an NDS context is transformed into octets using UTF-

8. The string should NOT be zero terminated.

A single DHCP option can only contain 255 octets. Since an NDS

context name can be longer than that, this option can appear more

than once in the DHCP packet. The contents of all NDS Context options

in the packet should be concatenated as suggested in the DHCP

specification [3, page 24] to get the complete NDS context. A single

encoded character could be split between two NDS Context Options.

The code for this option is 87. The maximum length for each instance

of this option is 255, but, as just described, the option may appear

more than once if the desired NDS context takes up more than 255

octets. Implementations are discouraged from enforcing any specific

maximum to the final concatenated NDS context.

Code Len Initial NDS Context

+----+----+----+----+----+----+--

87 n c1 c2 c3 c4 ...

+----+----+----+----+----+----+--

5. References

[1] Alexander, S. and R. Droms, "DHCP Options and BOOTP Vendor

Extensions", RFC-2132, March 1997.

[2] Bradner, S., "Key words for use in RFCs to Indicate Requirement

Levels", RFC-2119, March 1997.

[3] Droms, R., "Dynamic Host Configuration Protocol", RFC-2131,

March 1997.

[4] Yergeau, F., "UTF-8, a transformation format of Unicode and

ISO 10646", RFC-2044, October 1996

6. Security Considerations

DHCP currently provides no authentication or security mechanisms.

Potential eXPosures to attack are discussed in section 7 of the DHCP

protocol specification [3]. In particular, these DHCP options allow

an unauthorized DHCP server to misdirect an NDS client to a

nonexistent NDS server or even a spoof NDS server. These threats are

similar to what NDS faces during normal operations in its native IPX

environment.

7. Author's Address

Don Provan

Novell, Inc.

2180 Fortune Drive

San Jose, California, 95131

Phone: +1 408 577 8440

EMail: donp@Novell.Com

8. Full Copyright Statement

Copyright (C) The Internet Society (1997). All Rights Reserved.

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

Internet organizations, except as needed for the purpose of

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.

This document and the information contained herein is provided on an

"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING

TASK FORCE DISCLAIMS 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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