Network Working Group
Request for Comments: 4545
Category: Standards Track

M. Bakke
Cisco Systems
J. Muchow
Qlogic Corp.
May 2006

Definitions of Managed Objects for

IP Storage User Identity Authorization

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

Abstract

This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in TCP/IP-based internets. In particular, it defines objects for managing user identities and the names, addresses, and credentials required manage access control, for use with various protocols. This document was motivated by the need for the configuration of authorized user identities for the iSCSI protocol, but has been extended to be useful for other protocols that have similar requirements. It is important to note that this MIB module provides only the set of identities to be used within access lists; it is the responsibility of other MIB modules making use of this one to tie them to their own access lists or other authorization control methods.

   1. Introduction ....................................................3
   2. Specification of Requirements ...................................3
   3. The Internet-Standard Management Framework ......................3
   4. Relationship to Other MIB Modules ...............................3
   5. Relationship to the USM MIB Module ..............................4
   6. Relationship to SNMP Contexts ...................................5
   7. Discussion ......................................................5
      7.1. Authorization MIB Object Model .............................5
      7.2. ipsAuthInstance ............................................6
      7.3. ipsAuthIdentity ............................................7
      7.4. ipsAuthIdentityName ........................................7
      7.5. ipsAuthIdentityAddress .....................................8
      7.6. ipsAuthCredential ..........................................8
      7.7. IP, Fibre Channel, and Other Addresses .....................9
      7.8. Descriptors: Using OIDs in Place of Enumerated Types ......10
      7.9. Notifications .............................................10
   8. MIB Definitions ................................................11
   9. Security Considerations ........................................35
      9.1. MIB Security Considerations ...............................35
      9.2. Other Security Considerations .............................38
   10. IANA Considerations ...........................................40
   11. Normative References ..........................................40
   12. Informative References ........................................41
   13. Acknowledgements ..............................................41

1. Introduction

This MIB module will be used to configure and/or look at the configuration of user identities and their credential information. For the purposes of this MIB module, a "user" identity does not need to be an actual person; a user can also be a host, an application, a cluster of hosts, or any other identifiable entity that can be authorized to access a resource.

Most objects in this MIB module have a MAX-ACCESS of read-create; this module is intended to allow configuration of user identities and their names, addresses, and credentials. MIN-ACCESS for all objects is read-only for those implementations that configure through other means, but require the ability to monitor user identities.

2. Specification of Requirements

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 RFC 2119 [RFC2119].

3. The Internet-Standard Management Framework

For a detailed overview of the documents that describe the current Internet-Standard Management Framework, please refer to section 7 of RFC 3410 [RFC3410].

Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. MIB objects are generally accessed through the Simple Network Management Protocol (SNMP). Objects in the MIB are defined using the mechanisms defined in the Structure of Management Information (SMI). This memo specifies a MIB module that is compliant to the SMIv2, which is described in STD 58, RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580 [RFC2580].

4. Relationship to Other MIB Modules

The IPS-AUTH-MIB module does not directly address objects within other modules. The identity address objects contain IPv4, IPv6, or other address types, and as such they may be indirectly related to objects within the IP [RFC4293] MIB module.

This MIB module does not provide actual authorization or access control lists; it provides a means to identify entities that can be included in other authorization lists. This should generally be done in MIB modules that reference identities in this one. It also does not cover login or authentication failure statistics or notifications, as these are all fairly application specific and are not generic enough to be included here.

The user identity objects within this module are typically referenced from other modules by a RowPointer within that module. A module containing resources for which it requires a list of authorized user identities may create such a list, with a single RowPointer within each list element pointing to a user identity within this module. This is neither required nor restricted by this MIB module.

5. Relationship to the USM MIB Module

The User-based Security Model (USM) [RFC3414] also defines the concept of a user, defining authentication and privacy protocols and their credentials. The definition of USM includes the SNMP-USER- BASED-SM-MIB module allows configuration of SNMPv3 user credentials to protect SNMPv3 messages. Although USM's users are not related to the user identities managed by the IPS-AUTH-MIB module defined in this document, USM will often be implemented on the same system as the IPS-AUTH-MIB module, with the SNMP-USER-BASED-SM-MIB module used to manage the security protecting SNMPv3 messages, including those that access the IPS-AUTH-MIB module.

The term "user" in this document is distinct from an SNMPv3 user and is intended to include, but is not limited to, users of IP storage devices. A "user" in this document is a collection of user names (unique identifiers), user addresses, and credentials that can be used together to determine whether an entity should be allowed access to a resource. Each user can have multiple names, addresses, and credentials. As a result, this MIB module is particularly suited to managing users of storage resources, which are typically given access control lists consisting of potentially multiple identifiers, addresses, and credentials. This MIB module provides for authorization lists only and does not include setting of data privacy parameters.

In contrast, an SNMPv3 user as defined in [RFC3414] has exactly one user-name, one authentication protocol, and one privacy protocol, along with their associated information and SNMP-specific information, such as an engine ID. These objects are defined to support exactly the information needed for SNMPv3 security.

For the remainder of this document, the term "user" means an IPS- AUTH-MIB user identity.

6. Relationship to SNMP Contexts

Each non-scalar object in the IPS-AUTH-MIB module is indexed first by an instance. Each instance is a collection of identities that can be used to authorize access to a resource. The use of an instance works well with partitionable or hierarchical devices and fits in logically with other management schemes. Instances do not replace SNMP contexts; however, they do provide a very simple way to assign a collection of identities within a device to one or more SNMP contexts, without having to do so for each identity's row.

7. Discussion

This MIB module structure is intended to allow the configuration of a list of user identities, each with a list of names, addresses, credentials, and certificates that, when combined, will distinguish that identity.

The IPS-AUTH-MIB module is structured around two primary "objects", the authorization instance and the identity, which serve as containers for the remainder of the objects. This section contains a brief description of the "object" hierarchy and a description of each object, followed by a discussion of the actual SNMP table structure within the objects.

7.1. Authorization MIB Object Model

The top-level object in this structure is the authorization instance, which "contains" all of the other objects. The indexing hierarchy of this module looks like:

ipsAuthInstance: -- A distinct authorization entity within the managed system. -- Most implementations will have just one of these. ipsAuthIdentity

         -- A user identity, consisting of a set of identity names,
         -- addresses, and credentials reflected in the following
         -- objects:
         ipsAuthIdentityName
            -- A name for a user identity.  A name should be globally
            -- unique, and unchanging over time.  Some protocols may
            -- not require this one.
         ipsAuthIdentityAddress
            -- An address range, typically but not necessarily an
            -- IPv4, IPv6, or Fibre Channel address range, at which
            -- the identity is allowed to reside.
         ipsAuthCredential
            -- A single credential, such as a CHAP username,
         
            -- which can be used to verify the identity.
            ipsAuthCredChap
               -- CHAP-specific attributes for an ipsAuthCredential
            ipsAuthCredSrp
               -- SRP-specific attributes
            ipsAuthCredKerberos
               -- Kerberos-specific attributes

Each identity contains the information necessary to identify a particular end-point that wishes to access a service, such as iSCSI.

An identity can contain multiple names, addresses, and credentials. Each of these names, addresses, and credentials exists in its own row. If multiple rows of one of these three types are present, they are treated in an "OR" fashion; an entity to be authorized need only match one of the rows. If rows of different types are present (e.g., a name and an address), these are treated in an "AND" fashion; an entity to be authorized must match at least one row from each category. If there are no rows present of a category, this category is ignored.

For example, if an ipsAuthIdentity contains two rows of ipsAuthIdentityAddress, one row of ipsAuthCredential, and no rows of ipsAuthIdentityName, an entity must match the Credential row and at least one of the two Address rows to match the identity.

Index values such as ipsAuthInstIndex and ipsAuthIdentIndex are referenced in multiple tables, and rows can be added and deleted. An implementation should therefore attempt to keep all index values persistent across reboots; index values for rows that have been deleted must not be reused before a reboot.

7.2. ipsAuthInstance

The ipsAuthInstanceAttributesTable is the primary table of the IPS- AUTH-MIB module. Every other table entry in this module includes the index of an ipsAuthInstanceAttributesEntry as its primary index. An authorization instance is basically a managed set of identities.

Many implementations will include just one authorization instance row in this table. However, there will be cases where multiple rows in this table may be used:

A large system may be "partitioned" into multiple, distinct virtual systems, perhaps sharing the SNMP agent but not their lists of identities. Each virtual system would have its own authorization instance.

A set of stackable systems, each with its own set of identities, may be represented by a common SNMP agent. Each individual system would have its own authorization instance.

Multiple protocols, each with its own set of identities, may exist within a single system and be represented by a single SNMP agent. In this case, each protocol may have its own authorization instance.

An entry in this table is often referenced by its name (ipsAuthInstDescr), which should be displayed to the user by the management station. When an implementation supports only one entry in this table, the description may be returned as a zero-length string.

7.3. ipsAuthIdentity

The ipsAuthIdentAttributesTable contains one entry for each configured user identity. The identity contains only a description of what the identity is used for; its attributes are all contained in other tables, since they can each have multiple values.

Other MIB modules containing lists of users authorized to access a particular resource should generally contain a RowPointer to the ipsAuthIdentAttributesEntry that will, if authenticated, be allowed access to the resource.

All other table entries make use of the indices to this table as their primary indices.

7.4. ipsAuthIdentityName

The ipsAuthIdentNameAttributesTable contains a list of UTF-8 names, each of which belongs to, and may be used to identify, a particular identity in the authIdentity table.

Implementations making use of the IPS-AUTH-MIB module may identify their resources by names, addresses, or both. A name is typically a unique (within the required scope), unchanging identifier for a resource. It will normally meet some or all of the requirements for a Uniform Resource Name [RFC1737], although a name in the context of this MIB module does not need to be a URN. Identifiers that typically change over time should generally be placed into the ipsAuthIdentityAddress table; names that have no uniqueness properties should usually be placed into the description attribute for the identity.

An example of an identity name is the iSCSI Name, defined in [RFC3720]. Any other MIB module defining names to be used as ipsAuthIdentityName objects should specify how its names are unique, and the domain within which they are unique.

If this table contains no entries associated with a particular user identity, the implementation does not need to check any name parameters when verifying that identity. If the table contains multiple entries associated with a particular user identity, the implementation should consider a match with any one of these entries to be valid.

7.5. ipsAuthIdentityAddress

The ipsAuthIdentAddrAttributesTable contains a list of addresses at which the identity may reside. For example, an identity may be allowed access to a resource only from a certain IP address, or only if its address is in a certain range or set of ranges.

Each entry contains a starting and ending address. If a single address is desired in the list, both starting and ending addresses must be identical.

Each entry contains an AddrType attribute. This attribute contains an enumeration registered as an IANA Address Family type [IANA-AF]. Although many implementations will use IPv4 or IPv6 address types for these entries, any IANA-registered type may be used, as long as it makes sense to the application.

Matching any address within any range within the list associated with a particular identity is considered a valid match. If no entries are present in this list for a given identity, its address is automatically assumed to match the identity.

Netmasks are not supported, since an address range can express the same thing with more flexibility. An application specifying addresses using network masks may do so, and convert to and from address ranges when reading or writing this MIB module.

7.6. ipsAuthCredential

The ipsAuthCredentialAttributesTable contains a list of credentials, each of which may be used to verify a particular identity.

Each credential contains an authentication method to be used, such as CHAP [RFC1994], SRP [RFC2945], or Kerberos [RFC4120]. This attribute contains an object identifier instead of an enumerated type, allowing other MIB modules to add their own authentication methods, without modifying this MIB module.

For each entry in this table, there will exist an entry in another table containing its attributes. The table in which to place the entry depends on the AuthMethod attribute:

   CHAP     If the AuthMethod is set to the CHAP OID, an entry using the
            same indices as the ipsAuthCredential will exist in the
            ipsAuthCredChap table, which contains the CHAP username.
   
   SRP      If the AuthMethod is set to the SRP OID, an entry using the
            same indices as the ipsAuthCredential will exist in the
            ipsAuthCredSrp table, which contains the SRP username.

Kerberos If the AuthMethod is set to the Kerberos OID, an entry using

the same indices as the ipsAuthCredential will exist in the ipsAuthCredKerberos table, which contains the Kerberos principal.

   Other    If the AuthMethod is set to any OID not defined in this
            module, an entry using the same indices as the
            ipsAuthCredential entry should be placed in the other module
            that define whatever attributes are needed for that type of
            credential.

An additional credential type can be added to this MIB module by defining a new OID in the ipsAuthMethodTypes subtree, and defining a new table specific to that credential type.

7.7. IP, Fibre Channel, and Other Addresses

The IP addresses in this MIB module are represented by two attributes, one of type AddressFamilyNumbers, and the other of type AuthAddress. Each address can take on any of the types within the list of address family numbers; the most likely being IPv4, IPv6, or one of the Fibre Channel address types.

The type AuthAddress is an octet string. If the address family is IPv4 or IPv6, the format is taken from the InetAddress specified in [RFC4001]. If the address family is one of the Fibre Channel types, the format is identical to the FcNameIdOrZero type defined in [RFC4044].

7.8. Descriptors: Using OIDs in Place of Enumerated Types

Some attributes, particularly the authentication method attribute, would normally require an enumerated type. However, implementations will likely need to add new authentication method types of their own, without extending this MIB module. To make this work, this module defines a set of object identities within ipsAuthDescriptors. Each of these object identities is basically an enumerated type.

Attributes that make use of these object identities have a value that is an OID instead of an enumerated type. These OIDs can either indicate the object identities defined in this module, or object identities defined elsewhere, such as in an enterprise MIB module. Those implementations that add their own authentication methods should also define a corresponding object identity for each of these methods within their own enterprise MIB module, and return its OID whenever one of these attributes is using that method.

7.9. Notifications

Monitoring of authentication failures and other notification events are outside the scope of this MIB module, as they are generally application specific. No notifications are provided or required.

8. MIB Definitions

   IPS-AUTH-MIB DEFINITIONS  ::= BEGIN
   
       IMPORTS
       MODULE-IDENTITY, OBJECT-TYPE, OBJECT-IDENTITY, Unsigned32,
       mib-2
       FROM SNMPv2-SMI
   
       TEXTUAL-CONVENTION, RowStatus, AutonomousType, StorageType
       FROM SNMPv2-TC
   
       MODULE-COMPLIANCE, OBJECT-GROUP
       FROM SNMPv2-CONF
   
       SnmpAdminString
       FROM SNMP-FRAMEWORK-MIB -- RFC 3411
   
       AddressFamilyNumbers
       FROM IANA-ADDRESS-FAMILY-NUMBERS-MIB
       ;

ipsAuthMibModule MODULE-IDENTITY

       LAST-UPDATED  "200605220000Z" -- May 22, 2006
       ORGANIZATION  "IETF IPS Working Group"
       CONTACT-INFO
       "
       Mark Bakke
       Postal: Cisco Systems, Inc
       7900 International Drive, Suite 400
       Bloomington, MN
       USA 55425
       
       E-mail: mbakke@cisco.com

James Muchow
Postal: Qlogic Corp.
6321 Bury Dr.
Eden Prairie, MN
USA 55346

       E-Mail: james.muchow@qlogic.com"

DESCRIPTION

"The IP Storage Authorization MIB module.

       REVISION "200605220000Z" -- May 22, 2006
       DESCRIPTION
           "Initial version of the IP Storage Authentication MIB module,
           published as RFC 4545"
   
   ::= { mib-2 141 }
   
   ipsAuthNotifications OBJECT IDENTIFIER ::= { ipsAuthMibModule 0 }
   ipsAuthObjects       OBJECT IDENTIFIER ::= { ipsAuthMibModule 1 }
   ipsAuthConformance   OBJECT IDENTIFIER ::= { ipsAuthMibModule 2 }
   
   -- Textual Conventions

IpsAuthAddress ::= TEXTUAL-CONVENTION

       STATUS        current
       DESCRIPTION
           "IP Storage requires the use of address information
           that uses not only the InetAddress type defined in the
           INET-ADDRESS-MIB, but also Fibre Channel type defined
           in the Fibre Channel Management MIB.  Although these
           address types are recognized in the IANA Address Family
           Numbers MIB, the addressing mechanisms have not been
           merged into a well-known, common type.  This data type,
           the IpsAuthAddress, performs the merging for this MIB
           module.

The formats of objects of this type are determined by a corresponding object with syntax AddressFamilyNumbers, and thus every object defined using this TC must identify the object with syntax AddressFamilyNumbers that specifies its type.

The syntax and semantics of this object depend on the

identified AddressFamilyNumbers object as follows:

           AddressFamilyNumbers   this object
           ====================   ===========
           ipV4(1)                restricted to the same syntax and
                                  semantics as the InetAddressIPv4 TC.
           
           ipV6(2)                restricted to the same syntax and
                                  semantics as the InetAddressIPv6 TC.

fibreChannelWWPN (22)
& fibreChannelWWNN(23) restricted to the same syntax and

semantics as the FcNameIdOrZero TC.

Types other than the above should not be used unless

           the corresponding format of the IpsAuthAddress object is
           further specified (e.g., in a future revision of this TC)."
       REFERENCE
           "IANA-ADDRESS-FAMILY-NUMBERS-MIB;
            INET-ADDRESS-MIB (RFC 4001);
            FC-MGMT-MIB (RFC 4044)."
       SYNTAX        OCTET STRING (SIZE(0..255))
   
   --******************************************************************
   
   ipsAuthDescriptors OBJECT IDENTIFIER ::= { ipsAuthObjects 1 }
   
   ipsAuthMethodTypes OBJECT-IDENTITY
       STATUS        current
       DESCRIPTION
           "Registration point for Authentication Method Types."
       REFERENCE "RFC 3720, iSCSI Protocol Specification."
   ::= { ipsAuthDescriptors 1 }
   
   ipsAuthMethodNone OBJECT-IDENTITY
       STATUS        current
       DESCRIPTION
           "The authoritative identifier when no authentication
           method is used."
       REFERENCE "RFC 3720, iSCSI Protocol Specification."
   ::= { ipsAuthMethodTypes 1 }
   
   ipsAuthMethodSrp OBJECT-IDENTITY
       STATUS        current
       DESCRIPTION
           "The authoritative identifier when the authentication
           method is SRP."
       REFERENCE "RFC 3720, iSCSI Protocol Specification."
   ::= { ipsAuthMethodTypes 2 }
   
   ipsAuthMethodChap OBJECT-IDENTITY
       STATUS        current
       DESCRIPTION
           "The authoritative identifier when the authentication
           method is CHAP."
       REFERENCE "RFC 3720, iSCSI Protocol Specification."
   ::= { ipsAuthMethodTypes 3 }

ipsAuthMethodKerberos OBJECT-IDENTITY

       STATUS        current
       DESCRIPTION
           "The authoritative identifier when the authentication
           method is Kerberos."
   
       REFERENCE "RFC 3720, iSCSI Protocol Specification."
   ::= { ipsAuthMethodTypes 4 }
   
   --******************************************************************
   
   ipsAuthInstance OBJECT IDENTIFIER ::= { ipsAuthObjects 2 }

-- Instance Attributes Table

   ipsAuthInstanceAttributesTable OBJECT-TYPE
       SYNTAX        SEQUENCE OF IpsAuthInstanceAttributesEntry
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "A list of Authorization instances present on the system."
   ::= { ipsAuthInstance 2 }
   
   ipsAuthInstanceAttributesEntry OBJECT-TYPE
       SYNTAX        IpsAuthInstanceAttributesEntry
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "An entry (row) containing management information
           applicable to a particular Authorization instance."
       INDEX { ipsAuthInstIndex }
   ::= { ipsAuthInstanceAttributesTable 1 }
   
   IpsAuthInstanceAttributesEntry ::= SEQUENCE {
       ipsAuthInstIndex               Unsigned32,
       ipsAuthInstDescr               SnmpAdminString,
       ipsAuthInstStorageType         StorageType
   }
   
   ipsAuthInstIndex OBJECT-TYPE
       SYNTAX        Unsigned32 (1..4294967295)
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "An arbitrary integer used to uniquely identify a
           particular authorization instance.  This index value
           must not be modified or reused by an agent unless
           a reboot has occurred.  An agent should attempt to
           keep this value persistent across reboots."
   ::= { ipsAuthInstanceAttributesEntry 1 }

ipsAuthInstDescr OBJECT-TYPE

       SYNTAX        SnmpAdminString
       MAX-ACCESS    read-write
       STATUS        current
       DESCRIPTION
           "A character string, determined by the implementation to
           describe the authorization instance.  When only a single
           instance is present, this object may be set to the
           zero-length string; with multiple authorization
           instances, it must be set to a unique value in an
           implementation-dependent manner to describe the purpose
           of the respective instance.  If this is deployed in a
           master agent with more than one subagent implementing
           this MIB module, the master agent is responsible for
           ensuring that this object is unique across all
           subagents."
   ::= { ipsAuthInstanceAttributesEntry 2 }

ipsAuthInstStorageType OBJECT-TYPE

       SYNTAX        StorageType
       MAX-ACCESS    read-write
       STATUS        current
       DESCRIPTION
           "The storage type for all read-write objects within this
            row.  Rows in this table are always created via an
            external process, and may have a storage type of readOnly
            or permanent.  Conceptual rows having the value 'permanent'
            need not allow write access to any columnar objects in
            the row.

If this object has the value 'volatile', modifications to read-write objects in this row are not persistent across reboots. If this object has the value 'nonVolatile', modifications to objects in this row are persistent.

            An implementation may choose to allow this object
            to be set to either 'nonVolatile' or 'volatile',
            allowing the management application to choose this
            behavior."
       DEFVAL        { volatile }
   ::= { ipsAuthInstanceAttributesEntry 3 }
   
   ipsAuthIdentity OBJECT IDENTIFIER ::= { ipsAuthObjects 3 }
   
   -- User Identity Attributes Table

ipsAuthIdentAttributesTable OBJECT-TYPE

       SYNTAX        SEQUENCE OF IpsAuthIdentAttributesEntry
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "A list of user identities, each belonging to a
           particular ipsAuthInstance."
   ::= { ipsAuthIdentity 1 }
   
   ipsAuthIdentAttributesEntry OBJECT-TYPE
       SYNTAX        IpsAuthIdentAttributesEntry
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "An entry (row) containing management information
           describing a user identity within an authorization
           instance on this node."
       INDEX { ipsAuthInstIndex, ipsAuthIdentIndex }
   ::= { ipsAuthIdentAttributesTable  1 }
   
   IpsAuthIdentAttributesEntry ::= SEQUENCE {
       ipsAuthIdentIndex              Unsigned32,
       ipsAuthIdentDescription        SnmpAdminString,
       ipsAuthIdentRowStatus          RowStatus,
       ipsAuthIdentStorageType        StorageType
   }
   
   ipsAuthIdentIndex OBJECT-TYPE
       SYNTAX        Unsigned32 (1..4294967295)
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "An arbitrary integer used to uniquely identify a
           particular identity instance within an authorization
           instance present on the node.  This index value
           must not be modified or reused by an agent unless
           a reboot has occurred.  An agent should attempt to
           keep this value persistent across reboots."
   ::= { ipsAuthIdentAttributesEntry 1 }
   
   ipsAuthIdentDescription OBJECT-TYPE
       SYNTAX        SnmpAdminString
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "A character string describing this particular identity."
   ::= { ipsAuthIdentAttributesEntry 2 }

ipsAuthIdentRowStatus OBJECT-TYPE

       SYNTAX        RowStatus
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "This field allows entries to be dynamically added and
           removed from this table via SNMP.  When adding a row to
           this table, all non-Index/RowStatus objects must be set.
           Rows may be discarded using RowStatus.  The value of
           ipsAuthIdentDescription may be set while
           ipsAuthIdentRowStatus is 'active'."
   ::= { ipsAuthIdentAttributesEntry 3 }
   
   ipsAuthIdentStorageType OBJECT-TYPE
       SYNTAX        StorageType
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "The storage type for all read-create objects in this row.
            Rows in this table that were created through an external
            process may have a storage type of readOnly or permanent.
            Conceptual rows having the value 'permanent' need not
            allow write access to any columnar objects in the row."
       DEFVAL        { nonVolatile }
   ::= { ipsAuthIdentAttributesEntry 4 }
   
   ipsAuthIdentityName OBJECT IDENTIFIER ::= { ipsAuthObjects 4 }

-- User Initiator Name Attributes Table

   ipsAuthIdentNameAttributesTable OBJECT-TYPE
       SYNTAX        SEQUENCE OF IpsAuthIdentNameAttributesEntry
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "A list of unique names that can be used to positively
           identify a particular user identity."
   ::= { ipsAuthIdentityName 1 }
   
   ipsAuthIdentNameAttributesEntry OBJECT-TYPE
       SYNTAX        IpsAuthIdentNameAttributesEntry
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "An entry (row) containing management information
           applicable to a unique identity name, which can be used
           to identify a user identity within a particular
           authorization instance."
       INDEX { ipsAuthInstIndex, ipsAuthIdentIndex,
               ipsAuthIdentNameIndex }
   ::= { ipsAuthIdentNameAttributesTable  1 }
   IpsAuthIdentNameAttributesEntry ::= SEQUENCE {
       ipsAuthIdentNameIndex          Unsigned32,
       ipsAuthIdentName               SnmpAdminString,
       ipsAuthIdentNameRowStatus      RowStatus,
       ipsAuthIdentNameStorageType    StorageType
   }
   
   ipsAuthIdentNameIndex OBJECT-TYPE
       SYNTAX        Unsigned32 (1..4294967295)
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "An arbitrary integer used to uniquely identify a
           particular identity name instance within an
           ipsAuthIdentity within an authorization instance.
           This index value must not be modified or reused by
           an agent unless a reboot has occurred.  An agent
           should attempt to keep this value persistent across
           reboots."
   ::= { ipsAuthIdentNameAttributesEntry 1 }
   
   ipsAuthIdentName OBJECT-TYPE
       SYNTAX        SnmpAdminString
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "A character string that is the unique name of an
           identity that may be used to identify this ipsAuthIdent
           entry."
   ::= { ipsAuthIdentNameAttributesEntry 2 }
   
   ipsAuthIdentNameRowStatus OBJECT-TYPE
       SYNTAX        RowStatus
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "This field allows entries to be dynamically added and
           removed from this table via SNMP.  When adding a row to
           this table, all non-Index/RowStatus objects must be set.
           Rows may be discarded using RowStatus.  The value of
           ipsAuthIdentName may be set when this value is 'active'."
   ::= { ipsAuthIdentNameAttributesEntry 3 }

ipsAuthIdentNameStorageType OBJECT-TYPE

       SYNTAX        StorageType
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "The storage type for all read-create objects in this row.
            Rows in this table that were created through an external
            process may have a storage type of readOnly or permanent.
            Conceptual rows having the value 'permanent' need not
            allow write access to any columnar objects in the row."
       DEFVAL        { nonVolatile }
   ::= { ipsAuthIdentNameAttributesEntry 4 }
   
   ipsAuthIdentityAddress OBJECT IDENTIFIER ::= { ipsAuthObjects 5 }

-- User Initiator Address Attributes Table

   ipsAuthIdentAddrAttributesTable OBJECT-TYPE
       SYNTAX        SEQUENCE OF IpsAuthIdentAddrAttributesEntry
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "A list of address ranges that are allowed to serve
           as the endpoint addresses of a particular identity.
           An address range includes a starting and ending address
           and an optional netmask, and an address type indicator,
           which can specify whether the address is IPv4, IPv6,
           FC-WWPN, or FC-WWNN."
   ::= { ipsAuthIdentityAddress 1 }
   
   ipsAuthIdentAddrAttributesEntry OBJECT-TYPE
       SYNTAX        IpsAuthIdentAddrAttributesEntry
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "An entry (row) containing management information
           applicable to an address range that is used as part
           of the authorization of an identity
           within an authorization instance on this node."
       INDEX { ipsAuthInstIndex, ipsAuthIdentIndex,
               ipsAuthIdentAddrIndex }
   ::= { ipsAuthIdentAddrAttributesTable  1 }
   
   IpsAuthIdentAddrAttributesEntry ::= SEQUENCE {
       ipsAuthIdentAddrIndex          Unsigned32,
       ipsAuthIdentAddrType           AddressFamilyNumbers,
       ipsAuthIdentAddrStart          IpsAuthAddress,
       ipsAuthIdentAddrEnd            IpsAuthAddress,
       ipsAuthIdentAddrRowStatus      RowStatus,
       ipsAuthIdentAddrStorageType    StorageType
   }
   
   ipsAuthIdentAddrIndex OBJECT-TYPE
       SYNTAX        Unsigned32 (1..4294967295)
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "An arbitrary integer used to uniquely identify a
           particular ipsAuthIdentAddress instance within an
           ipsAuthIdentity within an authorization instance
           present on the node.
           This index value must not be modified or reused by
           an agent unless a reboot has occurred.  An agent
           should attempt to keep this value persistent across
           reboots."
   ::= { ipsAuthIdentAddrAttributesEntry 1 }
   
   ipsAuthIdentAddrType OBJECT-TYPE
       SYNTAX        AddressFamilyNumbers
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "The address types used in the ipsAuthIdentAddrStart
           and ipsAuthAddrEnd objects.  This type is taken
           from the IANA address family types."
   ::= { ipsAuthIdentAddrAttributesEntry 2 }
   
   ipsAuthIdentAddrStart OBJECT-TYPE
       SYNTAX        IpsAuthAddress
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "The starting address of the allowed address range.
           The format of this object is determined by
           ipsAuthIdentAddrType."
   ::= { ipsAuthIdentAddrAttributesEntry 3 }
   
   ipsAuthIdentAddrEnd OBJECT-TYPE
       SYNTAX        IpsAuthAddress
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "The ending address of the allowed address range.
           If the ipsAuthIdentAddrEntry specifies a single
           address, this shall match the ipsAuthIdentAddrStart.
           The format of this object is determined by
           ipsAuthIdentAddrType."
   ::= { ipsAuthIdentAddrAttributesEntry 4 }

ipsAuthIdentAddrRowStatus OBJECT-TYPE

       SYNTAX        RowStatus
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "This field allows entries to be dynamically added and
           removed from this table via SNMP.  When adding a row to
           this table, all non-Index/RowStatus objects must be set.
           Rows may be discarded using RowStatus.  The values of
           ipsAuthIdentAddrStart and ipsAuthIdentAddrEnd may be set
           when this value is 'active'.  The value of
           ipsAuthIdentAddrType may not be set when this value is
           'active'."
   ::= { ipsAuthIdentAddrAttributesEntry 5 }
   
   ipsAuthIdentAddrStorageType OBJECT-TYPE
       SYNTAX        StorageType
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "The storage type for all read-create objects in this row.
            Rows in this table that were created through an external
            process may have a storage type of readOnly or permanent.
            Conceptual rows having the value 'permanent' need not
            allow write access to any columnar objects in the row."
       DEFVAL        { nonVolatile }
   ::= { ipsAuthIdentAddrAttributesEntry 6 }
   
   ipsAuthCredential OBJECT IDENTIFIER ::= { ipsAuthObjects 6 }

-- Credential Attributes Table

   ipsAuthCredentialAttributesTable OBJECT-TYPE
       SYNTAX        SEQUENCE OF IpsAuthCredentialAttributesEntry
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "A list of credentials related to user identities
           that are allowed as valid authenticators of the
           particular identity."
   ::= { ipsAuthCredential 1 }

ipsAuthCredentialAttributesEntry OBJECT-TYPE

       SYNTAX        IpsAuthCredentialAttributesEntry
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "An entry (row) containing management information
           applicable to a credential that verifies a user
           identity within an authorization instance.
   
           To provide complete information in this MIB for a credential,
           the management station must not only create the row in this
           table but must also create a row in another table, where the
           other table is determined by the value of
           ipsAuthCredAuthMethod, e.g., if ipsAuthCredAuthMethod has the
           value ipsAuthMethodChap, a row must be created in the
           ipsAuthCredChapAttributesTable."
       INDEX { ipsAuthInstIndex, ipsAuthIdentIndex, ipsAuthCredIndex }
   ::= { ipsAuthCredentialAttributesTable  1 }
   
   IpsAuthCredentialAttributesEntry ::= SEQUENCE {
       ipsAuthCredIndex               Unsigned32,
       ipsAuthCredAuthMethod          AutonomousType,
       ipsAuthCredRowStatus           RowStatus,
       ipsAuthCredStorageType         StorageType
   }
   
   ipsAuthCredIndex OBJECT-TYPE
       SYNTAX        Unsigned32 (1..4294967295)
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "An arbitrary integer used to uniquely identify a
           particular Credential instance within an instance
           present on the node.
           This index value must not be modified or reused by
           an agent unless a reboot has occurred.  An agent
           should attempt to keep this value persistent across
           reboots."
   ::= { ipsAuthCredentialAttributesEntry 1 }

ipsAuthCredAuthMethod OBJECT-TYPE

       SYNTAX        AutonomousType
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "This object contains an OBJECT IDENTIFIER
           that identifies the authentication method
           used with this credential.

When a row is created in this table, a corresponding

row must be created by the management station

in a corresponding table specified by this value.

When a row is deleted from this table, the corresponding

row must be automatically deleted by the agent in

the corresponding table specified by this value.

If the value of this object is ipsAuthMethodNone, no

corresponding rows are created or deleted from other

tables.

           Some standardized values for this object are defined
           within the ipsAuthMethodTypes subtree."
   ::= { ipsAuthCredentialAttributesEntry 2 }
   
   ipsAuthCredRowStatus OBJECT-TYPE
       SYNTAX        RowStatus
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "This field allows entries to be dynamically added and
           removed from this table via SNMP.  When adding a row to
           this table, all non-Index/RowStatus objects must be set.
           Rows may be discarded using RowStatus.  The value of
           ipsAuthCredAuthMethod must not be changed while this row
           is 'active'."
   ::= { ipsAuthCredentialAttributesEntry 3 }
   
   ipsAuthCredStorageType OBJECT-TYPE
       SYNTAX        StorageType
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "The storage type for all read-create objects in this row.
            Rows in this table that were created through an external
            process may have a storage type of readOnly or permanent.
            Conceptual rows having the value 'permanent' need not
            allow write access to any columnar objects in the row."
       DEFVAL        { nonVolatile }
   ::= { ipsAuthCredentialAttributesEntry 4 }
   
   ipsAuthCredChap OBJECT IDENTIFIER ::= { ipsAuthObjects 7 }
   
   -- Credential Chap-Specific Attributes Table

ipsAuthCredChapAttributesTable OBJECT-TYPE

       SYNTAX        SEQUENCE OF IpsAuthCredChapAttributesEntry
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "A list of CHAP attributes for credentials that
           use ipsAuthMethodChap as their ipsAuthCredAuthMethod.

A row in this table can only exist when an instance of

the ipsAuthCredAuthMethod object exists (or is created

           simultaneously) having the same instance identifiers
           and a value of 'ipsAuthMethodChap'."
   ::= { ipsAuthCredChap 1 }

ipsAuthCredChapAttributesEntry OBJECT-TYPE

       SYNTAX        IpsAuthCredChapAttributesEntry
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "An entry (row) containing management information
           applicable to a credential that uses
           ipsAuthMethodChap as their ipsAuthCredAuthMethod.

When a row is created in ipsAuthCredentialAttributesTable with ipsAuthCredAuthMethod = ipsAuthCredChap, the management station must create a corresponding row in this table.

           When a row is deleted from ipsAuthCredentialAttributesTable
           with ipsAuthCredAuthMethod = ipsAuthCredChap, the
           agent must delete the corresponding row (if any) in
           this table."
       INDEX { ipsAuthInstIndex, ipsAuthIdentIndex, ipsAuthCredIndex }
   ::= { ipsAuthCredChapAttributesTable  1 }
   
   IpsAuthCredChapAttributesEntry ::= SEQUENCE {
       ipsAuthCredChapUserName        SnmpAdminString,
       ipsAuthCredChapRowStatus       RowStatus,
       ipsAuthCredChapStorageType     StorageType
   }
   
   ipsAuthCredChapUserName OBJECT-TYPE
       SYNTAX        SnmpAdminString
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "A character string containing the CHAP user name for this
           credential."
       REFERENCE
           "W. Simpson, RFC 1994: PPP Challenge Handshake
           Authentication Protocol (CHAP), August 1996"
   ::= { ipsAuthCredChapAttributesEntry 1 }

ipsAuthCredChapRowStatus OBJECT-TYPE

       SYNTAX        RowStatus
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "This field allows entries to be dynamically added and
           removed from this table via SNMP.  When adding a row to
           this table, all non-Index/RowStatus objects must be set.
           Rows may be discarded using RowStatus.  The value of
           ipsAuthCredChapUserName may be changed while this row
           is 'active'."
   ::= { ipsAuthCredChapAttributesEntry 2 }
   
   ipsAuthCredChapStorageType OBJECT-TYPE
       SYNTAX        StorageType
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "The storage type for all read-create objects in this row.
            Rows in this table that were created through an external
            process may have a storage type of readOnly or permanent.
            Conceptual rows having the value 'permanent' need not
            allow write access to any columnar objects in the row."
       DEFVAL        { nonVolatile }
   ::= { ipsAuthCredChapAttributesEntry 3 }
   
   ipsAuthCredSrp OBJECT IDENTIFIER ::= { ipsAuthObjects 8 }
   
   -- Credential Srp-Specific Attributes Table

ipsAuthCredSrpAttributesTable OBJECT-TYPE

       SYNTAX        SEQUENCE OF IpsAuthCredSrpAttributesEntry
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "A list of SRP attributes for credentials that
           use ipsAuthMethodSrp as its ipsAuthCredAuthMethod.
   
           A row in this table can only exist when an instance of
           the ipsAuthCredAuthMethod object exists (or is created
           simultaneously) having the same instance identifiers
           and a value of 'ipsAuthMethodSrp'."
   ::= { ipsAuthCredSrp 1 }

ipsAuthCredSrpAttributesEntry OBJECT-TYPE

       SYNTAX        IpsAuthCredSrpAttributesEntry
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "An entry (row) containing management information
           applicable to a credential that uses
           ipsAuthMethodSrp as their ipsAuthCredAuthMethod.

When a row is created in ipsAuthCredentialAttributesTable with ipsAuthCredAuthMethod = ipsAuthCredSrp, the management station must create a corresponding row in this table.

           When a row is deleted from ipsAuthCredentialAttributesTable
           with ipsAuthCredAuthMethod = ipsAuthCredSrp, the
           agent must delete the corresponding row (if any) in
           this table."
       INDEX { ipsAuthInstIndex, ipsAuthIdentIndex, ipsAuthCredIndex }
   ::= { ipsAuthCredSrpAttributesTable  1 }
   
   IpsAuthCredSrpAttributesEntry ::= SEQUENCE {
       ipsAuthCredSrpUserName         SnmpAdminString,
       ipsAuthCredSrpRowStatus        RowStatus,
       ipsAuthCredSrpStorageType      StorageType
   }
   
   ipsAuthCredSrpUserName OBJECT-TYPE
       SYNTAX        SnmpAdminString
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "A character string containing the SRP user name for this
           credential."
       REFERENCE
          "T. Wu, RFC 2945: The SRP Authentication and Key
          Exchange System, September 2000"
   ::= { ipsAuthCredSrpAttributesEntry 1 }
   
   ipsAuthCredSrpRowStatus OBJECT-TYPE
       SYNTAX        RowStatus
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "This field allows entries to be dynamically added and
           removed from this table via SNMP.  When adding a row to
           this table, all non-Index/RowStatus objects must be set.
           Rows may be discarded using RowStatus.  The value of
           ipsAuthCredSrpUserName may be changed while the status
           of this row is 'active'."
   ::= { ipsAuthCredSrpAttributesEntry 2 }

ipsAuthCredSrpStorageType OBJECT-TYPE

       SYNTAX        StorageType
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "The storage type for all read-create objects in this row.
            Rows in this table that were created through an external
            process may have a storage type of readOnly or permanent.
            Conceptual rows having the value 'permanent' need not
            allow write access to any columnar objects in the row."
       DEFVAL        { nonVolatile }
   ::= { ipsAuthCredSrpAttributesEntry 3 }
   
   ipsAuthCredKerberos OBJECT IDENTIFIER ::= { ipsAuthObjects 9 }
   
   -- Credential Kerberos-Specific Attributes Table

ipsAuthCredKerbAttributesTable OBJECT-TYPE

       SYNTAX        SEQUENCE OF IpsAuthCredKerbAttributesEntry
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "A list of Kerberos attributes for credentials that
           use ipsAuthMethodKerberos as their ipsAuthCredAuthMethod.
   
           A row in this table can only exist when an instance of
           the ipsAuthCredAuthMethod object exists (or is created
           simultaneously) having the same instance identifiers
           and a value of 'ipsAuthMethodKerb'."
   ::= { ipsAuthCredKerberos 1 }

ipsAuthCredKerbAttributesEntry OBJECT-TYPE

       SYNTAX        IpsAuthCredKerbAttributesEntry
       MAX-ACCESS    not-accessible
       STATUS        current
       DESCRIPTION
           "An entry (row) containing management information
           applicable to a credential that uses
           ipsAuthMethodKerberos as its ipsAuthCredAuthMethod.

When a row is created in ipsAuthCredentialAttributesTable with ipsAuthCredAuthMethod = ipsAuthCredKerberos, the management station must create a corresponding row in this table.

           When a row is deleted from ipsAuthCredentialAttributesTable
           with ipsAuthCredAuthMethod = ipsAuthCredKerberos, the
           agent must delete the corresponding row (if any) in
           this table."
       INDEX { ipsAuthInstIndex, ipsAuthIdentIndex, ipsAuthCredIndex }
   ::= { ipsAuthCredKerbAttributesTable  1 }

IpsAuthCredKerbAttributesEntry ::= SEQUENCE {

       ipsAuthCredKerbPrincipal       SnmpAdminString,
       ipsAuthCredKerbRowStatus       RowStatus,
       ipsAuthCredKerbStorageType     StorageType
   }
   
   ipsAuthCredKerbPrincipal OBJECT-TYPE
       SYNTAX        SnmpAdminString
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "A character string containing a Kerberos principal
           for this credential."
       REFERENCE
           "C. Neuman, S. Hartman, and K. Raeburn, RFC 4120:
           The Kerberos Network Authentication Service (V5),
           July 2005"
   ::= { ipsAuthCredKerbAttributesEntry 1 }
   
   ipsAuthCredKerbRowStatus OBJECT-TYPE
       SYNTAX        RowStatus
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "This field allows entries to be dynamically added and
           removed from this table via SNMP.  When adding a row to
           this table, all non-Index/RowStatus objects must be set.
           Rows may be discarded using RowStatus.  The value of
           ipsAuthCredKerbPrincipal may be changed while this row
           is 'active'."
   ::= { ipsAuthCredKerbAttributesEntry 2 }
   
   ipsAuthCredKerbStorageType OBJECT-TYPE
       SYNTAX        StorageType
       MAX-ACCESS    read-create
       STATUS        current
       DESCRIPTION
           "The storage type for all read-create objects in this row.
            Rows in this table that were created through an external
            process may have a storage type of readOnly or permanent.
            Conceptual rows having the value 'permanent' need not
            allow write access to any columnar objects in the row."
       DEFVAL        { nonVolatile }
   ::= { ipsAuthCredKerbAttributesEntry 3 }
   
   --******************************************************************
   -- Notifications

-- There are no notifications necessary in this MIB module.

   --******************************************************************
   
   -- Conformance Statements
   
   ipsAuthCompliances OBJECT IDENTIFIER ::= { ipsAuthConformance 1 }
   ipsAuthGroups      OBJECT IDENTIFIER ::= { ipsAuthConformance 2 }
   
   ipsAuthInstanceAttributesGroup OBJECT-GROUP
       OBJECTS {
           ipsAuthInstDescr,
           ipsAuthInstStorageType
       }
       STATUS current
       DESCRIPTION
           "A collection of objects providing information about
           authorization instances."
   ::= { ipsAuthGroups 1 }
   
   ipsAuthIdentAttributesGroup OBJECT-GROUP
       OBJECTS {
           ipsAuthIdentDescription,
           ipsAuthIdentRowStatus,
           ipsAuthIdentStorageType
       }
       STATUS current
       DESCRIPTION
           "A collection of objects providing information about
           user identities within an authorization instance."
   ::= { ipsAuthGroups 2 }
   
   ipsAuthIdentNameAttributesGroup OBJECT-GROUP
       OBJECTS {
           ipsAuthIdentName,
           ipsAuthIdentNameRowStatus,
           ipsAuthIdentNameStorageType
       }
       STATUS current
       DESCRIPTION
           "A collection of objects providing information about
           user names within user identities within an authorization
           instance."
   ::= { ipsAuthGroups 3 }

ipsAuthIdentAddrAttributesGroup OBJECT-GROUP

OBJECTS {: ipsAuthIdentAddrType,
ipsAuthIdentAddrStart,
ipsAuthIdentAddrEnd,

           ipsAuthIdentAddrRowStatus,
           ipsAuthIdentAddrStorageType
       }
       STATUS current
       DESCRIPTION
           "A collection of objects providing information about
           address ranges within user identities within an
           authorization instance."
   ::= { ipsAuthGroups 4 }
   
   ipsAuthIdentCredAttributesGroup OBJECT-GROUP
       OBJECTS {
           ipsAuthCredAuthMethod,
           ipsAuthCredRowStatus,
           ipsAuthCredStorageType
       }
       STATUS current
       DESCRIPTION
           "A collection of objects providing information about
           credentials within user identities within an authorization
           instance."
   ::= { ipsAuthGroups 5 }
   
   ipsAuthIdentChapAttrGroup OBJECT-GROUP
       OBJECTS {
           ipsAuthCredChapUserName,
           ipsAuthCredChapRowStatus,
           ipsAuthCredChapStorageType
       }
       STATUS current
       DESCRIPTION
           "A collection of objects providing information about
           CHAP credentials within user identities within an
           authorization instance."
   ::= { ipsAuthGroups 6 }
   
   ipsAuthIdentSrpAttrGroup OBJECT-GROUP
       OBJECTS {
           ipsAuthCredSrpUserName,
           ipsAuthCredSrpRowStatus,
           ipsAuthCredSrpStorageType
       }
       STATUS current
       DESCRIPTION
           "A collection of objects providing information about
           SRP credentials within user identities within an
           authorization instance."
   ::= { ipsAuthGroups 7 }
   ipsAuthIdentKerberosAttrGroup OBJECT-GROUP
       OBJECTS {
           ipsAuthCredKerbPrincipal,
           ipsAuthCredKerbRowStatus,
           ipsAuthCredKerbStorageType
       }
       STATUS current
       DESCRIPTION
           "A collection of objects providing information about
           Kerberos credentials within user identities within an
           authorization instance."
   ::= { ipsAuthGroups 8 }
   
   --******************************************************************

ipsAuthComplianceV1 MODULE-COMPLIANCE

STATUS current
DESCRIPTION

"Initial version of compliance statement based on initial version of this MIB module.

           The Instance and Identity groups are mandatory;
           at least one of the other groups (Name, Address,
           Credential, Certificate) is also mandatory for
           any given implementation."
       MODULE       -- this module
       MANDATORY-GROUPS {
           ipsAuthInstanceAttributesGroup,
           ipsAuthIdentAttributesGroup
       }

-- Conditionally mandatory groups to be included with
-- the mandatory groups when necessary.

GROUP ipsAuthIdentNameAttributesGroup
DESCRIPTION

"This group is mandatory for all implementations that make use of unique identity names."

GROUP ipsAuthIdentAddrAttributesGroup
DESCRIPTION

"This group is mandatory for all implementations

that use addresses to help verify identities."

GROUP ipsAuthIdentCredAttributesGroup
DESCRIPTION

"This group is mandatory for all implementations

that use credentials to help verify identities."

GROUP ipsAuthIdentChapAttrGroup
DESCRIPTION

"This group is mandatory for all implementations that use CHAP to help verify identities.

The ipsAuthIdentCredAttributesGroup must be implemented if this group is implemented."

GROUP ipsAuthIdentSrpAttrGroup
DESCRIPTION

"This group is mandatory for all implementations that use SRP to help verify identities.

The ipsAuthIdentCredAttributesGroup must be implemented if this group is implemented."

GROUP ipsAuthIdentKerberosAttrGroup
DESCRIPTION

"This group is mandatory for all implementations

that use Kerberos to help verify identities.

The ipsAuthIdentCredAttributesGroup must be implemented if this group is implemented."

       OBJECT ipsAuthInstDescr
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required."
       
       OBJECT ipsAuthInstStorageType
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required."
       
       OBJECT ipsAuthIdentDescription
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required."
       
       OBJECT ipsAuthIdentRowStatus
       SYNTAX INTEGER { active(1) } -- subset of RowStatus
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required, and only one of the
           six enumerated values for the RowStatus textual
           convention need be supported, specifically:
           active(1)."
       
       OBJECT ipsAuthIdentName
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required."
       
       OBJECT ipsAuthIdentNameRowStatus
       SYNTAX INTEGER { active(1) } -- subset of RowStatus
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required, and only one of the
           six enumerated values for the RowStatus textual
           convention need be supported, specifically:
           active(1)."
       
       OBJECT ipsAuthIdentAddrType
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required."
       
       OBJECT ipsAuthIdentAddrStart
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required."
       
       OBJECT ipsAuthIdentAddrEnd
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required."
       
       OBJECT ipsAuthIdentAddrRowStatus
       SYNTAX INTEGER { active(1) } -- subset of RowStatus
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required, and only one of the
           six enumerated values for the RowStatus textual
           convention need be supported, specifically:
           active(1)."
       
       OBJECT ipsAuthCredAuthMethod
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required."
       
       OBJECT ipsAuthCredRowStatus
       SYNTAX INTEGER { active(1) } -- subset of RowStatus
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required, and only one of the

six enumerated values for the RowStatus textual convention need be supported, specifically:
active(1)."

       OBJECT ipsAuthCredChapUserName
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required."
       
       OBJECT ipsAuthCredChapRowStatus
       SYNTAX INTEGER { active(1) } -- subset of RowStatus
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required, and only one of the
           six enumerated values for the RowStatus textual
           convention need be supported, specifically:
           active(1)."
       
       OBJECT ipsAuthCredSrpUserName
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required."
       
       OBJECT ipsAuthCredSrpRowStatus
       SYNTAX INTEGER { active(1) } -- subset of RowStatus
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required, and only one of the
           six enumerated values for the RowStatus textual
           convention need be supported, specifically:
           active(1)."
       
       OBJECT ipsAuthCredKerbPrincipal
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required."
       
       OBJECT ipsAuthCredKerbRowStatus
       SYNTAX INTEGER { active(1) } -- subset of RowStatus
       MIN-ACCESS read-only
       DESCRIPTION
           "Write access is not required, and only one of the six
           enumerated values for the RowStatus textual convention need
           be supported, specifically:  active(1)."
   
   ::= { ipsAuthCompliances 1 }
   
   END

9. Security Considerations

9.1. MIB Security Considerations

There are a number of management objects defined in this MIB module with a MAX-ACCESS clause of read-write and/or read-create. Such objects may be considered sensitive or vulnerable in some network environments. The support for SET operations in a non-secure environment without proper protection can have a negative effect on network operations. These are the tables and objects and their sensitivity/vulnerability:

in the ipsAuthInstanceAttributesTable:

ipsAuthInstDescr could be modified to camouflage the existence of a rogue authorization instance;

in the ipsAuthIdentAttributesTable:

ipsAuthIdentDescription could be modified to camouflage the existence of a rogue identity;

ipsAuthIdentRowStatus could be modified to add or delete a rogue identity;

ipsAuthIdentStorageType could be modified to make temporary rows permanent, or permanent rows temporary;

in the ipsAuthIdentNameAttributesTable:

ipsAuthIdentName could be modified to change the name of an existing identity;

ipsAuthIdentNameRowStatus could be modified to add or delete a name of an existing identity;

ipsAuthIdentNameStorageType could be modified to make temporary rows permanent, or permanent rows temporary;

in the ipsAuthIdentAddrAttributesTable:

ipsAuthIdentAddrType could be modified to change the type of address checking performed;

ipsAuthIdentAddrStart could be modified to change the start of the allowed range;

ipsAuthIdentAddrEnd could be modified to change the end of the allowed range;

ipsAuthIdentAddrRowStatus could be modified to add or delete the checking of an address range;

ipsAuthIdentAddrStorageType could be modified to make temporary rows permanent, or permanent rows temporary;

in the ipsAuthCredentialAttributesTable:

ipsAuthCredAuthMethod could be modified to change the type of authentication to be used;

ipsAuthCredRowStatus could be modified to add or delete checking of credentials;

ipsAuthCredStorageType could be modified to make temporary rows permanent, or permanent rows temporary;

in the ipsAuthCredChapAttributesTable:

ipsAuthCredChapUserName could be modified to change the CHAP user name for a credential;

ipsAuthCredChapRowStatus could be modified to add or delete CHAP attributes for credentials;

ipsAuthCredChapStorageType could be modified to make temporary rows permanent, or permanent rows temporary;

in the ipsAuthCredSrpAttributesTable:

ipsAuthCredSrpUserName could be modified to change the SRP user name for a credential;

ipsAuthCredSrpRowStatus could be modified to add or delete SRP attributes for credentials;

ipsAuthCredSrpStorageType could be modified to make temporary rows permanent, or permanent rows temporary;

in the ipsAuthCredKerbAttributesTable:

ipsAuthCredKerbPrincipal could be modified to change the Kerberos principal for a credential;

ipsAuthCredKerbRowStatus could be modified to add or delete Kerberos attributes for credentials;

ipsAuthCredKerbStorageType could be modified to make temporary rows permanent, or permanent rows temporary;

Note that removal of legitimate credentials can result in either denial of service or weakening the requirements for access of a particular service. Note also that some types of credentials, such as CHAP or SRP, also require passwords or verifiers to be associated with the credential. These are managed outside this MIB module.

Some of the readable objects in this MIB module (i.e., objects with a MAX-ACCESS other than not-accessible) may be considered sensitive or vulnerable in some network environments. It is thus important to control even GET and/or NOTIFY access to these objects and possibly to even encrypt the values of these objects when sending them over the network via SNMP. These are the tables and objects and their sensitivity/vulnerability:

All tables (specifically: ipsAuthInstanceAttributesTable, ipsAuthIdentAttributesTable, ipsAuthIdentNameAttributesTable, ipsAuthIdentAddrAttributesTable, ipsAuthCredentialAttributesTable, ipsAuthCredChapAttributesTable, ipsAuthCredSrpAttributesTable, and ipsAuthCredKerbAttributesTable) provide the ability to find out which names, addresses, and credentials would be required to access services on the managed system. If these credentials are easily spoofed (particularly the name or address), read access to this MIB module must be tightly controlled. When used with pointers from another MIB module to rows in the ipsAuthIdentAttributesTable, this MIB module provides information about which entities are authorized to connect to which entities.

SNMP versions prior to SNMPv3 did not include adequate security. Even if the network itself is secure (for example by using IPsec), even then, there is no control as to who on the secure network is allowed to access and GET/SET (read/change/create/delete) the objects in this MIB module.

It is RECOMMENDED that implementors consider the security features as provided by the SNMPv3 framework (see [RFC3410], section 8), including full support for the SNMPv3 cryptographic mechanisms (for authentication and privacy).

Further, deployment of SNMP versions prior to SNMPv3 is NOT RECOMMENDED. Instead, it is RECOMMENDED to deploy SNMPv3 and to enable cryptographic security. It is then a customer/operator responsibility to ensure that the SNMP entity giving access to an instance of this MIB module is properly configured to give access to the objects only to those principals (users) that have legitimate rights to indeed GET or SET (change/create/delete) them.

In many implementations, the objects in this MIB module can be read and modified via other mechanisms or protocols in addition to this MIB module. For the system to be secure, other mechanisms that can read and modify the contents of this MIB module must also address the above issues, and handle the threats outlined in [RFC3411], section 1.4.

Given the sensitivity of information contained in this MIB module, it is strongly recommended that encryption (SNMPv3 with a securityLevel of authPriv [RFC3411]) be used for all access to objects in this MIB module.

9.2. Other Security Considerations

An identity consists of a set of names (e.g., an iSCSI Initiator Name), addresses (e.g., an IP address or Fibre Channel World Wide Name (WWN)), and credentials (e.g., a CHAP user name).

To match an identity, one must match:

One of the IdentNames belonging to the IdentIndex, unless there are no IdentNames for the IdentIndex, and

One of the IdentAddrs belonging to the IdentIndex, unless there are no IdentAddrs for the IdentIndex, and

One of the IdentCreds belonging to the IdentIndex, unless there are no Creds for the IdentIndex.

Note that if any of the above lists are empty for a given IdentIndex, any identifier of that type is considered to match the identity. The non-empty lists will still be checked. For example, if the IdentAddrs list is empty for the IndentIndex, but there are entries in IdentNames and IdentCreds, any address will be considered a match, as long as the offered name and credential match one of the IdentNames and IdentCreds, respectively.

This leaves a possible security window while adding and removing entries from one of these lists. For example, an identity could consist of no IdentNames, no IdentAddrs, and exactly one IdentCred. If that IdentCred was to be updated, several methods could be used:

The UserName or Principal could be simply written in the appropriate table, if the credential's type remained the same (recommended).

The new credential could be added, then the old deleted (recommended).

The new credential could be added, and the old deleted in the same SNMP request (recommended, but do the add first).

The old credential could be deleted, then the new added (Don't use!).

Of the above methods, the last leaves a window in which the list is empty, possibly allowing unconstrained access to the resource making use of this MIB. This method should never be used for Names, Addrs, or Creds.

The use of the third method, adding and deleting within the same request, should be used with care. It is recommended that within the request, the add be done first. Otherwise, an implementation may attempt to perform these operations in order, potentially leaving a window.

The first two methods are recommended.

Care must also be taken when updating the IdentAddrs for an identity. Each IdentAddr specifies a range of addresses that match the identity, and has an address type, starting address, and ending address. Modifying these one at a time can open a temporary window where a larger range of addresses are allowed. For example, a single address is specified using IdentAddrType = ipv4, IdentAddrStart = IdentAddrEnd = 192.0.2.5. We want to update this to specify the single address 192.0.2.34. If the end address is updated first, we temporarily allow the range 192.0.2.5 .. 192.0.2.34, which is not what we want. Similarly, if we change from 192.0.2.34 back to 192.0.2.5, and we update IdentAddrStart first, we end up with the range again. To handle this, an application must either:

update both IdentAddrStart and IdentAddrEnd in the same SNMP set request, or

add the new IdentAddrStart and IdentAddrEnd with a new IdentAddrIndex, then delete the old one, using the methods shown before.

Since the value of IdentAddrType specifies the formats of IdentAddrStart and IdentAddrEnd, modification of IdentAddrType is not allowed for an existing row.

10. IANA Considerations

The IANA has assigned a MIB OID number under the mib-2 branch for the IPS-AUTH-MIB.

11. Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.
   
   [RFC2578]  McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J. ,
              Rose, M., and S. Waldbusser, "Structure of Management
              Information Version 2 (SMIv2)", STD 58, RFC 2578, April
              1999.
   
   [RFC2579]  McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
              Rose, M., and S. Waldbusser, "Textual Conventions for
              SMIv2", STD 58, RFC 2579, April 1999.
   
   [RFC2580]  McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
              Rose, M., and S. Waldbusser, "Conformance Statements for
              SMIv2", STD 58, RFC 2580, April 1999.
   
   [RFC3411]  Harrington, D., Presuhn, R., and B. Wijnen, "An
              Architecture for Describing Simple Network Management
              Protocol (SNMP) Management Frameworks", RFC 3411, December
              2002.
   
   [RFC4001]  Daniele, M., Haberman, B., Routhier, S., and J.
              Schoenwaelder, "Textual Conventions for Internet Network
              Addresses", RFC 4001, February 2005.
   
   [IANA-AF]  IANA, "IANA Address Family Numbers MIB",
              http://www.iana.org/assignments/
              ianaaddressfamilynumbers-mib.
   
   [RFC4293]  Routhier, S., "Management Information Base for the
              Internet Protocol (IP)", RFC 4293, April 2006.
   
   [RFC1994]  Simpson, W., "PPP Challenge Handshake Authentication
              Protocol (CHAP)", RFC 1994, August 1996.
   
   [RFC4120]  Neuman, C., Yu, T., Hartman, S., and K. Raeburn, "The
              Kerberos Network Authentication Service (V5)", RFC 4120,
              July 2005.
   
   [RFC2945]  Wu, T., "The SRP Authentication and Key Exchange System",
              RFC 2945, September 2000.

12. Informative References

   [RFC3410]  Case, J., Mundy, R., Partain, D., and B. Stewart,
              "Introduction and Applicability Statements for Internet-
              Standard Management Framework", RFC 3410, December 2002.
   
   [RFC3414]  Blumenthal, U. and B. Wijnen, "User-based Security Model
              (USM) for version 3 of the Simple Network Management
              Protocol (SNMPv3)", RFC 3414, December 2002.
   
   [RFC3720]  Satran, J., Meth, K., Sapuntzakis, C., Chadalapaka, M.,
              and E. Zeidner, "Internet Small Computer Systems Interface
              (iSCSI)", RFC 3720, March 2004.
   
   [RFC1737]  Sollins, K. and L. Masinter, "Functional Requirements for
              Uniform Resource Names", RFC 1737, December 1994.
   
   [RFC4044]  McCloghrie, K., "Fibre Channel Management MIB", RFC 4044,
              May 2005.

13. Acknowledgements

In addition to the authors, several people contributed to the development of this MIB module through discussions of authentication, authorization, and access within the iSCSI MIB module and security teams, including John Hufferd, Marjorie Krueger, Keith McCloghrie, Tom McSweeney, Steve Senum, and Josh Tseng. Thanks also to Bill Studenmund (Wasabi Systems) for adding the Kerberos method, and to Ayman Ghanem for finding and suggesting changes to several problems found in the MIB module.

Thanks especially to Keith McCloghrie for serving as advisor for this MIB module.

Authors' Addresses

Mark Bakke
Postal: Cisco Systems, Inc
7900 International Drive, Suite 400
Bloomington, MN
USA 55425

EMail:

          mbakke@cisco.com

James Muchow
Postal: Qlogic Corp.
6321 Bury Drive
Eden Prairie, MN
USA 55346

   EMail: james.muchow@qlogic.com

Full Copyright Statement

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Acknowledgement

Funding for the RFC Editor function is provided by the IETF Administrative Support Activity (IASA).

Definitions of Managed Objects for

IP Storage User Identity Authorization

Status of This Memo

Copyright Notice

Abstract

Table of Contents

1. Introduction

2. Specification of Requirements

3. The Internet-Standard Management Framework

4. Relationship to Other MIB Modules

5. Relationship to the USM MIB Module

6. Relationship to SNMP Contexts

7. Discussion

7.1. Authorization MIB Object Model

7.2. ipsAuthInstance

7.3. ipsAuthIdentity

7.4. ipsAuthIdentityName

7.5. ipsAuthIdentityAddress

7.6. ipsAuthCredential

7.7. IP, Fibre Channel, and Other Addresses

7.8. Descriptors: Using OIDs in Place of Enumerated Types

7.9. Notifications

8. MIB Definitions

The syntax and semantics of this object depend on the

identified AddressFamilyNumbers object as follows:

Types other than the above should not be used unless

When a row is created in this table, a corresponding

row must be created by the management station

in a corresponding table specified by this value.

When a row is deleted from this table, the corresponding

row must be automatically deleted by the agent in

the corresponding table specified by this value.

If the value of this object is ipsAuthMethodNone, no

corresponding rows are created or deleted from other

tables.

A row in this table can only exist when an instance of

the ipsAuthCredAuthMethod object exists (or is created

"This group is mandatory for all implementations

that use addresses to help verify identities."

"This group is mandatory for all implementations

that use credentials to help verify identities."

"This group is mandatory for all implementations

that use Kerberos to help verify identities.

9. Security Considerations

9.1. MIB Security Considerations

9.2. Other Security Considerations

10. IANA Considerations

11. Normative References

12. Informative References

13. Acknowledgements

Authors' Addresses

Full Copyright Statement

Intellectual Property

Acknowledgement