RFC2621 - RADIUS Accounting Server MIB

Network Working Group G. Zorn
Request for Comments: 2621 B. Aboba
Category: Informational Microsoft
June 1999
RADIUS Accounting Server MIB
Status of this Memo
This memo provides information for the Internet community. This memo
does not specify an Internet standard of any kind. Distribution of
this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (1999). All Rights Reserved.
Abstract
This memo defines a set of extensions which instrument RADIUS
accounting server functions. These extensions represent a portion of
the Management Information Base (MIB) for use with network management
protocols in the Internet community. Using these extensions IP-based
management stations can manage RADIUS accounting servers.
1. IntrodUCtion
This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in the Internet community.
In particular, it describes managed objects used for managing RADIUS
accounting servers.
RADIUS accounting servers are today widely deployed by dialup
Internet Service Providers, in order to provide accounting services.
As a result, the effective management of RADIUS accounting servers is
of considerable importance.
2. The SNMP Management Framework
The SNMP Management Framework presently consists of five major
components:
o An overall architecture, described in RFC2571 [1].
o Mechanisms for describing and naming objects and events for the
purpose of management. The first version of this Structure of
Management Information (SMI) is called SMIv1 and described in
STD 15, RFC1155 [2], STD 16, RFC1212 [3] and RFC1215 [4].
The second version, called SMIv2, is described in STD 58, RFC
2578 [5], RFC2579 [6] and RFC2580 [7].
o Message protocols for transferring management information. The
first version of the SNMP message protocol is called SNMPv1 and
described in STD 15, RFC1157 [8]. A second version of the
SNMP message protocol, which is not an Internet standards
track protocol, is called SNMPv2c and described in RFC1901
[9] and RFC1906 [10]. The third version of the message
protocol is called SNMPv3 and described in RFC1906 [10], RFC
2572 [11] and RFC2574 [12].
o Protocol operations for Accessing management information. The
first set of protocol operations and associated PDU formats is
described in STD 15, RFC1157 [8]. A second set of protocol
operations and associated PDU formats is described in RFC1905
[13].
o A set of fundamental applications described in RFC2573 [14] and
the view-based access control mechanism described in RFC2575
[15].
Managed objects are accessed via a virtual information store, termed
the Management Information Base or MIB. Objects in the MIB are
defined using the mechanisms defined in the SMI.
This memo specifies a MIB module that is compliant to the SMIv2. A
MIB conforming to the SMIv1 can be produced through the appropriate
translations. The resulting translated MIB must be semantically
equivalent, except where objects or events are omitted because no
translation is possible (use of Counter64). Some machine readable
information in SMIv2 will be converted into textual descriptions in
SMIv1 during the translation process. However, this loss of machine
readable information is not considered to change the semantics of the
MIB.
3. Overview
The RADIUS accounting protocol, described in [16], distinguishes
between the client function and the server function. In RADIUS
accounting, clients send Accounting-Requests, and servers reply with
Accounting-Responses. Typically NAS devices implement the client
function, and thus would be eXPected to implement the RADIUS
accounting client MIB, while RADIUS accounting servers implement the
server function, and thus would be expected to implement the RADIUS
accounting server MIB.
However, it is possible for a RADIUS accounting entity to perform
both client and server functions. For example, a RADIUS proxy may act
as a server to one or more RADIUS accounting clients, while
simultaneously acting as an accounting client to one or more
accounting servers. In such situations, it is expected that RADIUS
entities combining client and server functionality will support both
the client and server MIBs.
3.1. Selected objects
This MIB module contains thirteen scalars as well as a single table:
(1) the RADIUS Accounting Client Table contains one row for each
RADIUS accounting client that the server shares a secret with.
Each entry in the RADIUS Accounting Client Table includes eleven
columns presenting a view of the activity of the RADIUS accounting
server.
4. Definitions
RADIUS-ACC-SERVER-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, OBJECT-IDENTITY,
Counter32, Integer32,
IpAddress, TimeTicks, mib-2 FROM SNMPv2-SMI
SnmpAdminString FROM SNMP-FRAMEWORK-MIB
MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF;
radiusAccServMIB MODULE-IDENTITY
LAST-UPDATED "9906110000Z" -- 11 Jun 1999
ORGANIZATION "IETF RADIUS Working Group."
CONTACT-INFO
" Bernard Aboba
Microsoft
One Microsoft Way
Redmond, WA 98052
US
Phone: +1 425 936 6605
EMail: bernarda@microsoft.com"
DESCRIPTION
"The MIB module for entities implementing the server
side of the Remote Access Dialin User Service (RADIUS)
accounting protocol."
REVISION "9906110000Z" -- 11 Jun 1999
DESCRIPTION "Initial version as published in RFC2621"
::= { radiusAccounting 1 }
radiusMIB OBJECT-IDENTITY
STATUS current
DESCRIPTION
"The OID assigned to RADIUS MIB work by the IANA."
::= { mib-2 67 }
radiusAccounting OBJECT IDENTIFIER ::= {radiusMIB 2}
radiusAccServMIBObjects OBJECT IDENTIFIER ::=
{ radiusAccServMIB 1 }
radiusAccServ OBJECT IDENTIFIER ::= { radiusAccServMIBObjects 1 }
radiusAccServIdent OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The implementation identification string for the
RADIUS accounting server software in use on the
system, for example; `FNS-2.1""
::= {radiusAccServ 1}
radiusAccServUpTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"If the server has a persistent state (e.g., a process),
this value will be the time elapsed (in hundredths of a
second) since the server process was started.
For software without persistent state, this value will
be zero."
::= {radiusAccServ 2}
radiusAccServResetTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"If the server has a persistent state (e.g., a process)
and supports a `reset" operation (e.g., can be told to
re-read configuration files), this value will be the
time elapsed (in hundredths of a second) since the
server was `reset." For software that does not
have persistence or does not support a `reset" operation,
this value will be zero."
::= {radiusAccServ 3}
radiusAccServConfigReset OBJECT-TYPE
SYNTAX INTEGER { other(1),
reset(2),
initializing(3),
running(4)}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Status/action object to reinitialize any persistent
server state. When set to reset(2), any persistent
server state (such as a process) is reinitialized as if
the server had just been started. This value will
never be returned by a read operation. When read, one
of the following values will be returned:
other(1) - server in some unknown state;
initializing(3) - server (re)initializing;
running(4) - server currently running."
::= {radiusAccServ 4}
-- New Stats proposed by Dale E. Reed Jr (daler@iea.com)
radiusAccServTotalRequests OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of packets received on the
accounting port."
::= { radiusAccServ 5 }
radiusAccServTotalInvalidRequests OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RADIUS Accounting-Request packets
received from unknown addresses."
::= { radiusAccServ 6 }
radiusAccServTotalDupRequests OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of duplicate RADIUS Accounting-Request
packets received."
::= { radiusAccServ 7 }
radiusAccServTotalResponses OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RADIUS Accounting-Response packets sent."
::= { radiusAccServ 8 }
radiusAccServTotalMalformedRequests OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of malformed RADIUS Accounting-Request
packets received. Bad authenticators or unknown
types are not included as malformed Access-Requests."
::= { radiusAccServ 9 }
radiusAccServTotalBadAuthenticators OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RADIUS Accounting-Request packets
which contained invalid Signature attributes."
::= { radiusAccServ 10 }
radiusAccServTotalPacketsDropped OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of incoming packets silently discarded
for a reason other than malformed, bad authenticators,
or unknown types."
::= { radiusAccServ 11 }
radiusAccServTotalNoRecords OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RADIUS Accounting-Request packets
which were received and responded to but not
recorded."
::= { radiusAccServ 12 }
radiusAccServTotalUnknownTypes OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RADIUS packets of unknowntype which
were received."
::= { radiusAccServ 13 }
-- End of new
radiusAccClientTable OBJECT-TYPE
SYNTAX SEQUENCE OF RadiusAccClientEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The (conceptual) table listing the RADIUS accounting
clients with which the server shares a secret."
::= { radiusAccServ 14 }
radiusAccClientEntry OBJECT-TYPE
SYNTAX RadiusAccClientEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry (conceptual row) representing a RADIUS
accounting client with which the server shares a secret."
INDEX { radiusAccClientIndex }
::= { radiusAccClientTable 1 }
RadiusAccClientEntry ::= SEQUENCE {
radiusAccClientIndex Integer32,
radiusAccClientAddress IpAddress,
radiusAccClientID SnmpAdminString,
radiusAccServPacketsDropped Counter32,
radiusAccServRequests Counter32,
radiusAccServDupRequests Counter32,
radiusAccServResponses Counter32,
radiusAccServBadAuthenticators Counter32,
radiusAccServMalformedRequests Counter32,
radiusAccServNoRecords Counter32,
radiusAccServUnknownTypes Counter32
}
radiusAccClientIndex OBJECT-TYPE
SYNTAX Integer32 (1..2147483647)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A number uniquely identifying each RADIUS accounting
client with which this server communicates."
::= { radiusAccClientEntry 1 }
radiusAccClientAddress OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The NAS-IP-Address of the RADIUS accounting client
referred to in this table entry."
::= { radiusAccClientEntry 2 }
radiusAccClientID OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The NAS-Identifier of the RADIUS accounting client
referred to in this table entry. This is not necessarily
the same as sysName in MIB II."
::= { radiusAccClientEntry 3 }
-- Server Counters
--
-- Requests - DupRequests - BadAuthenticators - MalformedRequests -
-- UnknownTypes - PacketsDropped - Responses = Pending
--
-- Requests - DupRequests - BadAuthenticators - MalformedRequests -
-- UnknownTypes - PacketsDropped - NoRecords = entries logged
radiusAccServPacketsDropped OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of incoming packets received
from this client and silently discarded
for a reason other than malformed, bad
authenticators, or unknown types."
::= { radiusAccClientEntry 4 }
radiusAccServRequests OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of packets received from this
client on the accounting port."
::= { radiusAccClientEntry 5 }
radiusAccServDupRequests OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of duplicate RADIUS Accounting-Request
packets received from this client."
::= { radiusAccClientEntry 6 }
radiusAccServResponses OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RADIUS Accounting-Response packets
sent to this client."
::= { radiusAccClientEntry 7 }
radiusAccServBadAuthenticators OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RADIUS Accounting-Request packets
which contained invalid authenticators received
from this client."
::= { radiusAccClientEntry 8 }
radiusAccServMalformedRequests OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of malformed RADIUS Accounting-Request
packets which were received from this client.
Bad authenticators and unknown types
are not included as malformed Accounting-Requests."
::= { radiusAccClientEntry 9 }
radiusAccServNoRecords OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RADIUS Accounting-Request packets
which were received and responded to but not
recorded."
::= { radiusAccClientEntry 10 }
radiusAccServUnknownTypes OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RADIUS packets of unknown type which
were received from this client."
::= { radiusAccClientEntry 11 }
-- conformance information
radiusAccServMIBConformance
OBJECT IDENTIFIER ::= { radiusAccServMIB 2 }
radiusAccServMIBCompliances
OBJECT IDENTIFIER ::= { radiusAccServMIBConformance 1 }
radiusAccServMIBGroups
OBJECT IDENTIFIER ::= { radiusAccServMIBConformance 2 }
-- compliance statements
radiusAccServMIBCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for accounting servers
implementing the RADIUS Accounting Server MIB."
MODULE -- this module
MANDATORY-GROUPS { radiusAccServMIBGroup }
OBJECT radiusAccServConfigReset
WRITE-SYNTAX INTEGER { reset(2) }
DESCRIPTION "The only SETable value is "reset" (2)."
::= { radiusAccServMIBCompliances 1 }
-- units of conformance
radiusAccServMIBGroup OBJECT-GROUP
OBJECTS {radiusAccServIdent,
radiusAccServUpTime,
radiusAccServResetTime,
radiusAccServConfigReset,
radiusAccServTotalRequests,
radiusAccServTotalInvalidRequests,
radiusAccServTotalDupRequests,
radiusAccServTotalResponses,
radiusAccServTotalMalformedRequests,
radiusAccServTotalBadAuthenticators,
radiusAccServTotalPacketsDropped,
radiusAccServTotalNoRecords,
radiusAccServTotalUnknownTypes,
radiusAccClientAddress,
radiusAccClientID,
radiusAccServPacketsDropped,
radiusAccServRequests,
radiusAccServDupRequests,
radiusAccServResponses,
radiusAccServBadAuthenticators,
radiusAccServMalformedRequests,
radiusAccServNoRecords,
radiusAccServUnknownTypes
}
STATUS current
DESCRIPTION
"The collection of objects providing management of
a RADIUS Accounting Server."
::= { radiusAccServMIBGroups 1 }
END
5. References
[1] Harrington, D., Presuhn, R., and B. Wijnen, "An Architecture
for Describing SNMP Management Frameworks", RFC2571, April
1999.
[2] Rose, M., and K. McCloghrie, "Structure and Identification of
Management Information for TCP/IP-based Internets", STD 16, RFC
1155, May 1990.
[3] Rose, M., and K. McCloghrie, "Concise MIB Definitions", STD 16,
RFC1212, March 1991.
[4] Rose, M., "A Convention for Defining Traps for use with the
SNMP", RFC1215, Performance Systems International, March 1991.
[5] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose,
M. and S. Waldbusser, "Structure of Management Information
Version 2 (SMIv2)", STD 58, RFC2578, April 1999.
[6] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose,
M. and S. Waldbusser, "Textual Conventions for SMIv2", STD 58,
RFC2579, April 1999.
[7] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose,
M. and S. Waldbusser, "Conformance Statements for SMIv2", STD
58, RFC2580, April 1999.
[8] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "Simple
Network Management Protocol", STD 15, RFC1157, May 1990.
[9] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser,
"Introduction to Community-based SNMPv2", RFC1901, January
1996.
[10] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser,
"Transport Mappings for Version 2 of the Simple Network
Management Protocol (SNMPv2)", RFC1906, January 1996.
[11] Case, J., Harrington D., Presuhn R., and B. Wijnen, "Message
Processing and Dispatching for the Simple Network Management
Protocol (SNMP)", RFC2572, April 1999.
[12] Blumenthal, U., and B. Wijnen, "User-based Security Model for
Version 3 of the Simple Network Management Protocol (SNMPv3)",
RFC2574, April 1999.
[13] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Protocol
Operations for Version 2 of the Simple Network Management
Protocol (SNMPv2)", RFC1905, January 1996.
[14] Levi, D., Meyer, P., and B. Stewart, "SNMP Applications", RFC
2573, April 1999.
[15] Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based Access
Control Model for the Simple Network Management Protocol
(SNMP)", RFC2575, April 1999.
[16] Rigney, C., "RADIUS Accounting", RFC2139, April 1997.
6. Security Considerations
There are management objects (radiusAccServConfigReset) defined in
this MIB that have 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.
There are a number of managed objects in this MIB that may contain
sensitive information. These are:
radiusAccClientAddress
This can be used to determine the address of the RADIUS
accounting client with which the server is communicating.
This information could be useful in impersonating the
client.
radiusAccClientID This can be used to determine the client ID for the
accounting client with which the server is communicating.
This information could be useful in impersonating the
client.
It is thus important to control even GET access to these objects and
possibly to even encrypt the values of these object when sending them
over the network via SNMP. Not all versions of SNMP provide features
for such a secure environment.
SNMPv1 by itself is not a secure environment. Even if the network
itself is secure (for example by using IPSec), 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.
It is recommended that the implementers consider the security
features as provided by the SNMPv3 framework. Specifically, the use
of the User-based Security Model RFC2574 [12] and the View-based
Access Control Model RFC2575 [15] is recommended. Using these
security features, customer/users can give access to the objects only
to those principals (users) that have legitimate rights to GET or SET
(change/create/delete) them.
7. Acknowledgments
The authors acknowledge the contributions of the RADIUS Working Group
in the development of this MIB. Thanks to Narendra Gidwani of
Microsoft, Allan C. Rubens of MERIT, Carl Rigney of Livingston and
Peter Heitman of American Internet Corporation for useful discussions
of this problem space.
8. Authors" Addresses
Bernard Aboba
Microsoft Corporation
One Microsoft Way
Redmond, WA 98052
Phone: 425-936-6605
EMail: bernarda@microsoft.com
Glen Zorn
Microsoft Corporation
One Microsoft Way
Redmond, WA 98052
Phone: 425-703-1559
EMail: glennz@microsoft.com
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