Network Working Group M. Bakke

Network Working Group M. Bakke
Request for Comments: 4545 Cisco Systems
Category: Standards Track 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

Copyright (C) The Internet Society (2006).

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.

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RFC 4545 IPS Authorization MIB May 2006

Table of Contents

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

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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

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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.

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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,

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-- 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.

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- 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.

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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.

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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].

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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.

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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: [email protected]

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

E-Mail: [email protected]"

DESCRIPTION
"The IP Storage Authorization MIB module.
Copyright (C) The Internet Society (2006). This version of
this MIB module is part of RFC 4545; see the RFC itself for
full legal notices."

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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

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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."

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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

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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

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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

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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 }

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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

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"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

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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

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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.

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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.

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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

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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

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"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.

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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

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"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 {

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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.

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RFC 4545 IPS Authorization MIB May 2006

--******************************************************************

-- 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,

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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 }

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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."

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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)."

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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

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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

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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:

o in the ipsAuthInstanceAttributesTable:

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

o 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;

o 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;

o 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;

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RFC 4545 IPS Authorization MIB May 2006

- 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;

o 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;

o 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;

o 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;

o in the ipsAuthCredKerbAttributesTable:

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

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RFC 4545 IPS Authorization MIB May 2006

- 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:

o 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

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RFC 4545 IPS Authorization MIB May 2006

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:

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

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

o 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:

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RFC 4545 IPS Authorization MIB May 2006

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

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

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

o 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:

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

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

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RFC 4545 IPS Authorization MIB May 2006

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.

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RFC 4545 IPS Authorization MIB May 2006

[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.

Bakke & Muchow Standards Track [Page 41]

RFC 4545 IPS Authorization MIB May 2006

Authors' Addresses

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

EMail: [email protected]

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

EMail: [email protected]

Bakke & Muchow Standards Track [Page 42]

RFC 4545 IPS Authorization MIB May 2006

Full Copyright Statement

Copyright (C) The Internet Society (2006).

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contained in BCP 78, and except as set forth therein, the authors
retain all their rights.

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