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rfc:rfc4174

Network Working Group C. Monia Request for Comments: 4174 Consultant Category: Standards Track J. Tseng

                                                   Riverbed Technology
                                                            K. Gibbons
                                                    McDATA Corporation
                                                        September 2005
    The IPv4 Dynamic Host Configuration Protocol (DHCP) Option
              for the Internet Storage Name Service

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 (2005).

Abstract

 This document describes the Dynamic Host Configuration Protocol
 (DHCP) option to allow Internet Storage Name Service (iSNS) clients
 to discover the location of the iSNS server automatically through the
 use of DHCP for IPv4.  iSNS provides discovery and management
 capabilities for Internet SCSI (iSCSI) and Internet Fibre Channel
 Protocol (iFCP) storage devices in an enterprise-scale IP storage
 network.  iSNS provides intelligent storage management services
 comparable to those found in Fibre Channel networks, allowing a
 commodity IP network to function in a similar capacity to that of a
 storage area network.

Table of Contents

 1.  Introduction .................................................  2
     1.1.  Conventions Used in This Document ......................  2
 2.  iSNS Option for DHCP .........................................  3
     2.1.  iSNS Functions Field ...................................  5
     2.2.  Discovery Domain Access Field ..........................  6
     2.3.  Administrative Flags Field .............................  7
     2.4.  iSNS Server Security Bitmap ............................  8
 3.  Security Considerations ......................................  9
 4.  IANA Considerations .......................................... 11

Monia, et al. Standards Track [Page 1] RFC 4174 DHCP Option Number for iSNS September 2005

 5.  Normative References ......................................... 11
 6.  Informative References ....................................... 11

1. Introduction

 The Dynamic Host Configuration Protocol for IPv4 provides a framework
 for passing configuration information to hosts.  Its usefulness
 extends to hosts and devices using the iSCSI and iFCP protocols to
 connect to block level storage assets over a TCP/IP network.
 The iSNS Protocol provides a framework for automated discovery,
 management, and configuration of iSCSI and iFCP devices on a TCP/IP
 network.  It provides functionality similar to that found on Fibre
 Channel networks, except that iSNS works within the context of an IP
 network.  iSNS thereby provides the requisite storage intelligence to
 IP networks that are standard on existing Fibre Channel networks.
 Existing DHCP options cannot be used to find iSNS servers for the
 following reasons:
 a) iSNS functionality is distinctly different from other protocols
    using DHCP options.  Specifically, iSNS provides a significant
    superset of capabilities compared to typical name resolution
    protocols such as DNS.  It is designed to support client devices
    that allow themselves to be configured and managed from a central
    iSNS server.
 b) iSNS requires a DHCP option format that provides more than the
    location of the iSNS server.  The DHCP option has to specify the
    subset of iSNS services that may be actively used by the iSNS
    client.
 The DHCP option number for iSNS is used by iSCSI and iFCP devices to
 discover the location and role of the iSNS server.  The DHCP option
 number assigned for iSNS by IANA is 83.

1.1. Conventions Used in This Document

 iSNS refers to the Internet Storage Name Service framework, which
 consists of the storage network model and associated services.
 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].
 All frame formats are in big-endian network byte order.  RESERVED
 fields SHOULD be set to zero.

Monia, et al. Standards Track [Page 2] RFC 4174 DHCP Option Number for iSNS September 2005

 This document uses the following terms:
    "iSNS Client" - iSNS clients are processes resident in iSCSI and
    iFCP devices that initiate transactions with the iSNS server using
    the iSNS Protocol.
    "iSNS Server" - The iSNS server responds to iSNS protocol query
    and registration messages and initiates asynchronous notification
    messages.  The iSNS server stores information registered by iSNS
    clients.
    "iSCSI (Internet SCSI)" - iSCSI is an encapsulation of SCSI for a
    new generation of storage devices interconnected with TCP/IP.
    "iFCP (Internet Fibre Channel Protocol)" - iFCP is a gateway-to-
    gateway protocol designed to interconnect existing Fibre Channel
    devices using TCP/IP.  iFCP maps the Fibre Channel transport and
    fabric services to TCP/IP.

2. iSNS Option for DHCP

 This option specifies the location of the primary and backup iSNS
 servers and the iSNS services available to an iSNS client.
  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |   Code =  83  |    Length     |          iSNS Functions       |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |           DD Access           |     Administrative FLAGS      |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                 iSNS Server Security Bitmap                   |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |      a1       |       a2      |       a3      |       a4      |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |      b1       |       b2      |       b3      |       b4      |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                            . . . .                            |
 |                 Additional Secondary iSNS Servers             |
 |                            . . . .                            |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                    Figure 1. iSNS Server Option

Monia, et al. Standards Track [Page 3] RFC 4174 DHCP Option Number for iSNS September 2005

 The iSNS Option specifies a list of IP addresses used by iSNS
 servers.  The option contains the following parameters:
    Length: The number of bytes that follow the Length field.
    iSNS Functions: A bitmapped field defining the functions supported
          by the iSNS servers.  The format of this field is described
          in section 2.1.
    Discovery Domain Access: A bit field indicating the types of iSNS
          clients that are allowed to modify Discovery Domains.  The
          field contents are described in section 2.2.
    Administrative Flags field: Contains the administrative settings
          for the iSNS servers discovered through the DHCP query.  The
          contents of this field are described in section 2.3.
    iSNS Server Security Bitmap: Contains the iSNS server security
          settings specified in section 2.4.
    a1...a4: Depending on the setting of the Heartbeat bit in the
          Administrative Flags field (see section 2.3), this field
          contains either the IP address from which the iSNS heartbeat
          originates (see [iSNS]) or the IP address of the primary
          iSNS server.
    b1...b4: Depending on the setting of Heartbeat bit in the
          Administrative Flags field (see section 2.3), this field
          contains either the IP address of the primary iSNS server or
          that of a secondary iSNS server.
    Additional Secondary iSNS Servers: Each set of four octets
          specifies the IP address of a secondary iSNS server.
 The Code field through IP address field a1...a4 MUST be present in
 every response to the iSNS query; therefore the Length field has a
 minimum value of 14.
 If the Heartbeat bit is set in the Administrative Flags field (see
 section 2.3), then b1...b4 MUST also be present.  In this case, the
 minimum value of the Length field is 18.
 The inclusion of Additional Secondary iSNS Servers in the response
 MUST be indicated by increasing the Length field accordingly.

Monia, et al. Standards Track [Page 4] RFC 4174 DHCP Option Number for iSNS September 2005

2.1. iSNS Functions Field

 The iSNS Functions Field defines the iSNS server's operational role
 (i.e., how the iSNS server is to be used).  The iSNS server's role
 can be as basic as providing simple discovery information, or as
 significant as providing IKE/IPSec security policies and certificates
 for the use of iSCSI and iFCP devices.  The format of the iSNS
 Functions field is shown in Figure 2.
               0                   1         1
               0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
              +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
              |       RESERVED          |S|A|E|
              +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
               Figure 2. iSNS Functions Field
         Bit Field     Significance
         ---------     ------------
         15            Function Fields Enabled
         14            DD-Based Authorization
         13            Security Policy Distribution
 The following are iSNS Functions Field definitions:
    Function Fields  Specifies the validity of the remaining
    Enabled:         iSNS Function fields.  If it is set to one, then
                     the contents of all other iSNS Function fields
                     are valid.  If it is set to zero, then the
                     contents of all other iSNS Function fields MUST
                     be ignored.
    DD-based         Indicates whether devices in a common
    Authorization:   Discovery Domain (DD) are implicitly authorized
                     to access one another.  Although Discovery
                     Domains control the scope of device discovery,
                     they do not necessarily indicate whether a domain
                     member is authorized to access discovered
                     devices.  If this bit is set to one, then devices
                     in a common Discovery Domain are automatically
                     allowed access to each other (if successfully
                     authenticated).  If this bit is set to zero, then
                     access authorization is not implied by domain
                     membership and must be explicitly performed by
                     each device.  In either case, devices not in a
                     common discovery domain are not allowed to access
                     each other.

Monia, et al. Standards Track [Page 5] RFC 4174 DHCP Option Number for iSNS September 2005

    Security Policy  Indicates whether the iSNS client is to
    Distribution:    download and use the security policy
                     configuration stored in the iSNS server.  If it
                     is set to one, then the policy is stored in the
                     iSNS server and must be used by the iSNS client
                     for its own security policy.  If it is set to
                     zero, then the iSNS client must obtain its
                     security policy configuration by other means.

2.2. Discovery Domain Access Field

 The format of the DD Access bit field is shown in Figure 3.
                0           1   1   1   1   1   1
                0  ...  9   0   1   2   3   4   5
              +---+---+---+---+---+---+---+---+---+
              | RESERVED  | if| tf| is| ts| C | E |
              +---+---+---+---+---+---+---+---+---+
             Figure 3. Discovery Domain Access Field
          Bit Field  Significance
          ---------  ------------
              15     Enabled
              14     Control Node
              13     iSCSI Target
              12     iSCSI Initiator
              11     iFCP Target Port
              10     iFCP Initiator Port
 The following are Discovery Domain Access Field definitions:
    Enabled:           Specifies the validity of the remaining DD
                       Access bit field.  If it is set to one, then
                       the contents of the remainder of the DD Access
                       field are valid.  If it is set to zero, then
                       the contents of the remainder of this field
                       MUST be ignored.
    Control Node:      Specifies whether the iSNS server allows
                       Discovery Domains to be added, modified, or
                       deleted by means of Control Nodes.  If it is
                       set to one, then Control Nodes are allowed to
                       modify the Discovery Domain configuration.  If
                       it is set to zero, then Control Nodes are not
                       allowed to modify Discovery Domain
                       configurations.

Monia, et al. Standards Track [Page 6] RFC 4174 DHCP Option Number for iSNS September 2005

    iSCSI Target,      Determine whether the respective
    iSCSI Initiator,   registered iSNS client (determined
    iFCP Target Port,  by iSCSI Node Type or iFCP Port Role)
    iFCP Initiator     is allowed to add, delete, or modify
    Port:              Discovery Domains.  If they are set to one,
                       then modification by the specified client type
                       is allowed.  If they are set to zero, then
                       modification by the specified client type is
                       not allowed.
                       (A node may implement multiple node types.)

2.3. Administrative Flags Field

 The format of the Administrative Flags bit field is shown in Figure
 4.
                    0                   1         1
                    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                   |    RESERVED           |D|M|H|E|
                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                    Figure 4. Administrative Flags
               Bit Field      Significance
               ---------      ------------
                   15          Enabled
                   14          Heartbeat
                   13          Management SCNs
                   12          Default Discovery Domain
 The following are Administrative Flags Field definitions:
    Enabled:           Specifies the validity of the remainder of the
                       Administrative Flags field.  If it is set to
                       one, then the contents of the remaining
                       Administrative Flags are valid.  If it is set
                       to zero, then the remaining contents MUST be
                       ignored, indicating that iSNS administrative
                       settings are obtained through means other than
                       DHCP.
    Heartbeat:         Indicates whether the first IP address is the
                       multicast address to which the iSNS heartbeat
                       message is sent.  If it is set to one, then
                       a1-a4 contains the heartbeat multicast address
                       and b1-b4 contains the IP address of the

Monia, et al. Standards Track [Page 7] RFC 4174 DHCP Option Number for iSNS September 2005

                       primary iSNS server, followed by the IP
                       address(es) of any backup servers (see Figure
                       1).  If it is set to zero, then a1-a4 contain
                       the IP address of the primary iSNS server,
                       followed by the IP address(es) of any backup
                       servers.
    Management SCNs:   Indicates whether control nodes are authorized
                       to register for receiving Management State
                       Change Notifications (SCNs).  Management SCNs
                       are a special class of State Change
                       Notification whose scope is the entire iSNS
                       database.  If this bit is set to one, then
                       control nodes are authorized to register for
                       receiving Management SCNs.  If it is set to
                       zero, then control nodes are not authorized to
                       receive Management SCNs (although they may
                       receive normal SCNs).
    Default Discovery  Indicates whether a newly registered
    Domain:            device that is not explicitly placed into a
                       Discovery Domain (DD) and Discovery Domain Set
                       (DDS) should be automatically placed into a
                       default DD and DDS.  If it is set to one, then
                       a default DD shall contain all devices in the
                       iSNS database that have not been explicitly
                       placed into a DD by an iSNS client.  If it is
                       set to zero, then devices not explicitly placed
                       into a DD are not members of any DD.

2.4. iSNS Server Security Bitmap

 The format of the iSNS server security Bitmap field is shown in
 Figure 5.  If valid, this field communicates to the DHCP client the
 security settings that are required to communicate with the indicated
 iSNS server.
  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                     RESERVED                    |T|X|P|A|M|S|E|
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                 Figure 5. iSNS Server Security Bitmap

Monia, et al. Standards Track [Page 8] RFC 4174 DHCP Option Number for iSNS September 2005

         Bit Field     Significance
         ---------     ----------------
              31      Enabled
              30      IKE/IPSec
              29      Main Mode
              28      Aggressive Mode
              27      PFS
              26      Transport Mode
              25      Tunnel Mode
 The following are iSNS Server Security Bitmap definitions:
    Enabled:           Specifies the validity of the remainder of the
                       iSNS server security bitmap.  If it is set to
                       one, then the contents of the remainder of the
                       field are valid.  If it is set to zero, then
                       the contents of the rest of the field are
                       undefined and MUST be ignored.
    IKE/IPSec:         1 = IKE/IPSec enabled; 0 = IKE/IPSec disabled.
    Main Mode:         1 = Main Mode enabled; 0 = Main Mode disabled.
    Aggressive Mode:   1 = Aggressive Mode enabled;
                       0 = Aggressive Mode disabled.
    PFS:               1 = PFS enabled; 0 = PFS disabled.
    Transport Mode:    1 = Transport Mode preferred; 0 = No
                       preference.
    Tunnel Mode:       1 = Tunnel Mode preferred; 0 = No preference.
 If IKE/IPSec is disabled, this indicates that the Internet Key
 Exchange (IKE) Protocol is not available to configure IPSec keys for
 iSNS sessions to this iSNS server.  It does not necessarily preclude
 other key exchange methods (e.g., manual keying) from establishing an
 IPSec security association for the iSNS session.
 If IKE/IPsec is enabled, then for each of the bit pairs <Main Mode,
 Aggressive Mode> and <Transport Mode, Tunnel Mode>, one of the two
 bits MUST be set to 1, and the other MUST be set to 0.

3. Security Considerations

 For protecting the iSNS option, the DHCP Authentication security
 option as specified in [RFC3118] may present a problem due to the
 limited implementation and deployment of the DHCP authentication

Monia, et al. Standards Track [Page 9] RFC 4174 DHCP Option Number for iSNS September 2005

 option.  The IPsec security mechanisms for iSNS itself are specified
 in [iSNS] to provide confidentiality when sensitive information is
 distributed via iSNS.  See the Security Considerations section of
 [iSNS] for details and specific requirements for implementation of
 IPsec.
 In addition, [iSNS] describes an authentication block that provides
 message integrity for multicast or broadcast iSNS messages (i.e., for
 heartbeat/discovery messages only).  See [RFC3723] for further
 discussion of security for these protocols.
 If no sensitive information, as described in [iSNS], is being
 distributed via iSNS, and an Entity is discovered via iSNS,
 authentication and authorization are handled by the IP Storage
 protocols whose endpoints are discovered via iSNS; specifically, iFCP
 [iFCP] and iSCSI [RFC3720].  It is the responsibility of the
 providers of these services to ensure that an inappropriately
 advertised or discovered service does not compromise their security.
 When no DHCP security is used, there is a risk of distribution of
 false discovery information (e.g., via the iSNS DHCP option
 identifying a false iSNS server that distributes the false discovery
 information).  The primary countermeasure for this risk is
 authentication by the IP storage protocols discovered through iSNS.
 When this risk is a significant concern, IPsec SAs SHOULD be used (as
 specified in RFC 3723).  For example, if an attacker uses DHCP and
 iSNS to distribute discovery information that falsely identifies an
 iSCSI endpoint, that endpoint will lack the credentials necessary to
 complete IKE authentication successfully, and therefore will be
 prevented from falsely sending or receiving iSCSI traffic.  When this
 risk of false discovery information is a significant concern and
 IPsec is implemented for iSNS, IPsec SAs SHOULD also be used for iSNS
 traffic to prevent use of a false iSNS server; this is more robust
 than relying only on the IP Storage protocols to detect false
 discovery information.
 When IPsec is implemented for iSNS, there is a risk of a denial-of-
 service attack based on repeated use of false discovery information
 that will cause initiation of IKE negotiation.  The countermeasures
 for this are administrative configuration of each iSNS Entity to
 limit the peers it is willing to communicate with (i.e., by IP
 address range and/or DNS domain), and maintenance of a negative
 authentication cache to avoid repeatedly contacting an iSNS Entity
 that fails to authenticate.  These three measures (i.e., IP address
 range limits, DNS domain limits, negative authentication cache) MUST
 be implemented for iSNS entities when this DHCP option is used.  An
 analogous argument applies to the IP storage protocols that can be
 discovered via iSNS as discussed in RFC 3723.

Monia, et al. Standards Track [Page 10] RFC 4174 DHCP Option Number for iSNS September 2005

 In addition, use of the techniques described in [RFC2827] and
 [RFC3833] may also be relevant to reduce denial-of-service attacks.

4. IANA Considerations

 In accordance with the policy defined in [DHCP], IANA has assigned a
 value of 83 for this option.
 There are no other IANA-assigned values defined by this
 specification.

5. Normative References

 [DHCP]    Droms, R., "Dynamic Host Configuration Protocol", RFC 2131,
           March 1997.
 [iSNS]    Tseng, J., Gibbons, K., Travostino, F., Du Laney, C., and
           J. Souza, "Internet Storage Name Service (iSNS)", RFC 4171,
           September 2005.
 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
           Requirement Levels", BCP 14, RFC 2119, March 1997.
 [RFC3118] Droms, R. and W. Arbaugh, "Authentication for DHCP
           Messages", RFC 3118, June 2001.
 [RFC3720] Satran, J., Meth, K., Sapuntzakis, C., Chadalapaka, M., and
           E. Zeidner, "Internet Small Computer Systems Interface
           (iSCSI)", RFC 3720, April 2004.
 [RFC3723] Aboba, B., Tseng, J., Walker, J., Rangan, V., and F.
           Travostino, "Securing Block Storage Protocols over IP", RFC
           3723, April 2004.

6. Informative References

 [iFCP]    Monia, C., Mullendore, R., Travostino, F., Jeong, W., and
           M. Edwards, "iFCP - A Protocol for Internet Fibre Channel
           Storage Networking", RFC 4172, September 2005.
 [RFC2827] Ferguson, P. and D. Senie, "Network Ingress Filtering:
           Defeating Denial of Service Attacks which employ IP Source
           Address Spoofing", BCP 38, RFC 2827, May 2000.
 [RFC3833] Atkins, D. and R. Austein, "Threat Analysis of the Domain
           Name System (DNS)", RFC 3833, August 2004.

Monia, et al. Standards Track [Page 11] RFC 4174 DHCP Option Number for iSNS September 2005

Authors' Addresses

 Kevin Gibbons
 McDATA Corporation
 4555 Great America Parkway
 Santa Clara, CA 95054-1208
 Phone: (408) 567-5765
 EMail: kevin.gibbons@mcdata.com
 Charles Monia
 7553 Morevern Circle
 San Jose, CA 95135
 EMail: charles_monia@yahoo.com
 Josh Tseng
 Riverbed Technology
 501 2nd Street, Suite 410
 San Francisco, CA 94107
 Phone:  (650)274-2109
 EMail:  joshtseng@yahoo.com

Monia, et al. Standards Track [Page 12] RFC 4174 DHCP Option Number for iSNS September 2005

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 Internet Society.

Monia, et al. Standards Track [Page 13]

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