Network Working Group
Request for Comments: 4673
Category: Informational

S. De Cnodder
Alcatel
N. Jonnala
M. Chiba
Cisco Systems, Inc.
September 2006

RADIUS Dynamic Authorization Server MIB

Status of This Memo

This memo provides information for the Internet community. It does not specify an Internet standard of any kind. 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 the Internet community. In particular, it describes the Remote Authentication Dial-In User Service (RADIUS) (RFC 2865) Dynamic Authorization Server (DAS) functions that support the dynamic authorization extensions as defined in RFC 3576.

   1. Introduction ....................................................2
      1.1. Requirements Notation ......................................2
      1.2. Terminology ................................................2
   2. The Internet-Standard Management Framework ......................2
   3. Overview ........................................................3
   4. RADIUS Dynamic Authorization Server MIB Definitions .............5
   5. Security Considerations ........................................20
   6. IANA Considerations ............................................21
   7. Acknowledgements ...............................................21
   8. References .....................................................21
      8.1. Normative References ......................................21
      8.2. Informative References ....................................22

1. Introduction

This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. It is becoming increasingly important to support Dynamic Authorization extensions on the network access server (NAS) devices to handle the Disconnect and Change-of-Authorization (CoA) messages as described in [RFC3576]. As a result, the effective management of RADIUS Dynamic Authorization entities is of considerable importance. This RADIUS Dynamic Authorization Server (DAS) MIB complements the managed objects used for managing RADIUS authentication and accounting clients as described in [RFC4668] and [RFC4670], respectively.

1.1. Requirements Notation

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].

1.2. Terminology

Dynamic Authorization Server (DAS)

The component that resides on the NAS that processes the Disconnect and Change-of-Authorization (CoA) Request packets [RFC3576] sent by the Dynamic Authorization Client.

Dynamic Authorization Client (DAC)

The component that sends Disconnect and CoA-Request packets to the Dynamic Authorization Server. Although this component often resides on the RADIUS server, it is also possible for it to be located on a separate host, such as a Rating Engine.

Dynamic Authorization Server Port

The UDP port on which the Dynamic Authorization Server listens for the Disconnect and CoA requests sent by the Dynamic Authorization Client.

2. 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 [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].

3. Overview

"Dynamic Authorization Extensions to RADIUS" [RFC3576] defines the operation of Disconnect-Request, Disconnect-ACK, Disconnect-NAK, CoA-Request, CoA-ACK, and CoA-NAK packets. Typically, NAS devices implement the DAS function, and thus would be expected to implement the RADIUS Dynamic Authorization Server MIB, whereas DACs implement the client function and thus would be expected to implement the RADIUS Dynamic Authorization Client MIB.

However, it is possible for a RADIUS Dynamic Authorization entity to perform both client and server functions. For example, a RADIUS proxy may act as a DAS to one or more DACs while simultaneously acting as a DAC to one or more DASs. In such situations, it is expected that RADIUS entities combining client and server functionality will support both the client and server MIBs.

This memo describes the MIB for Dynamic Authorization Servers and relates to the following documents as follows:

[RFC4668] describes the MIB for a RADIUS Auth Client MIB.

[RFC4669] describes the MIB for a RADIUS Auth Server MIB.

[RFC4670] describes the MIB for a RADIUS Acct Client MIB.

[RFC4671] describes the MIB for a RADIUS Acct Server MIB.

[RFC4672] describes the MIB for a RADIUS Dynamic Auth Client.

A NAS typically implements the MIBs for a RADIUS Authentication Client, a RADIUS accounting client, and a RADIUS Dynamic Authorization Server. However, any one MIB can be implemented without implementing any of the other MIBs; i.e., the MIBs have no dependencies on each other. A typical case would be for a device to implement the MIBs RADIUS authentication server, RADIUS accounting server, and RADIUS Dynamic Authorization Client. A RADIUS proxy might implement any, all, or a subset of the MIBs listed above and the MIB as defined in this document.

              +---------------+                      +---------------+
    User 1----|               |  Disconnect-Request  |               |
              |    Dynamic    |     CoA-Request      |    Dynamic    |
    User 2----| Authorization |<---------------------| Authorization |
              |    Server     |--------------------->|    Client     |
    User 3----|     (DAS)     |    Disconnect-Ack    |     (DAC)     |
              |               |    Disconnect-NAK    |               |
              +---------------+    CoA-Ack/CoA-NAK   +---------------+

Figure 1. Mapping of clients and servers

This MIB module for the Dynamic Authorization Server contains the following:

Three scalar objects.

One Dynamic Authorization Client Table. This table contains one row for each DAC with which the DAS shares a secret.

4. RADIUS Dynamic Authorization Server MIB Definitions

RADIUS-DYNAUTH-SERVER-MIB DEFINITIONS ::= BEGIN

IMPORTS

       MODULE-IDENTITY, OBJECT-TYPE,
       Counter32, Integer32, mib-2,
       TimeTicks         FROM SNMPv2-SMI             -- [RFC2578]
       SnmpAdminString   FROM SNMP-FRAMEWORK-MIB     -- [RFC3411]
       InetAddressType,
       InetAddress       FROM INET-ADDRESS-MIB       -- [RFC4001]
       MODULE-COMPLIANCE,
       OBJECT-GROUP  FROM SNMPv2-CONF;               -- [RFC2580]

radiusDynAuthServerMIB MODULE-IDENTITY

       LAST-UPDATED "200608290000Z" -- 29 August 2006
       ORGANIZATION "IETF RADEXT Working Group"
       CONTACT-INFO
       
              " Stefaan De Cnodder
                Alcatel
                Francis Wellesplein 1
                B-2018 Antwerp
                Belgium
       
                Phone: +32 3 240 85 15
                EMail: stefaan.de_cnodder@alcatel.be

Nagi Reddy Jonnala
Cisco Systems, Inc.
Divyasree Chambers, B Wing,
O'Shaugnessy Road,
Bangalore-560027, India.

                Phone: +91 94487 60828
                EMail: njonnala@cisco.com

Murtaza Chiba
Cisco Systems, Inc.
170 West Tasman Dr.
San Jose CA, 95134

                Phone: +1 408 525 7198
                EMail: mchiba@cisco.com "
       DESCRIPTION
           "The MIB module for entities implementing the server
            side of the Dynamic Authorization Extensions to the
            Remote Authentication Dial-In User Service (RADIUS)
            protocol.  Copyright © The Internet Society (2006).

Initial version as published in RFC 4673; for full legal notices see the RFC itself."

       REVISION "200608290000Z" -- 29 August 2006
       DESCRIPTION "Initial version as published in RFC 4673."
       ::= { mib-2 146 }

radiusDynAuthServerMIBObjects OBJECT IDENTIFIER ::=

{ radiusDynAuthServerMIB 1 }

radiusDynAuthServerScalars OBJECT IDENTIFIER ::=

{ radiusDynAuthServerMIBObjects 1 }

radiusDynAuthServerDisconInvalidClientAddresses OBJECT-TYPE

      SYNTAX Counter32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
            "The number of Disconnect-Request packets received from
             unknown addresses.  This counter may experience a
             discontinuity when the DAS module (re)starts, as
             indicated by the value of
             radiusDynAuthServerCounterDiscontinuity."
      ::= { radiusDynAuthServerScalars 1 }

radiusDynAuthServerCoAInvalidClientAddresses OBJECT-TYPE

      SYNTAX Counter32
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
            "The number of CoA-Request packets received from unknown
             addresses.  This counter may experience a discontinuity
             when the DAS module (re)starts, as indicated by the
             value of radiusDynAuthServerCounterDiscontinuity."
      ::= { radiusDynAuthServerScalars 2 }

radiusDynAuthServerIdentifier OBJECT-TYPE

      SYNTAX SnmpAdminString
      MAX-ACCESS read-only
      STATUS current
      DESCRIPTION
             "The NAS-Identifier of the RADIUS Dynamic Authorization
              Server.  This is not necessarily the same as sysName in
              MIB II."
      REFERENCE
             "RFC 2865, Section 5.32, NAS-Identifier."
      ::= { radiusDynAuthServerScalars 3 }

radiusDynAuthClientTable OBJECT-TYPE

      SYNTAX SEQUENCE OF RadiusDynAuthClientEntry
      MAX-ACCESS not-accessible
      STATUS     current
      DESCRIPTION
            "The (conceptual) table listing the RADIUS Dynamic
             Authorization Clients with which the server shares a
             secret."
      ::= { radiusDynAuthServerMIBObjects 2 }

radiusDynAuthClientEntry OBJECT-TYPE

       SYNTAX     RadiusDynAuthClientEntry
       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION
             "An entry (conceptual row) representing one Dynamic
              Authorization Client with which the server shares a
              secret."
       INDEX      { radiusDynAuthClientIndex }
       ::= { radiusDynAuthClientTable 1 }

RadiusDynAuthClientEntry ::= SEQUENCE {

       radiusDynAuthClientIndex                     Integer32,
       radiusDynAuthClientAddressType               InetAddressType,
       radiusDynAuthClientAddress                   InetAddress,
       radiusDynAuthServDisconRequests              Counter32,
       radiusDynAuthServDisconAuthOnlyRequests      Counter32,
       radiusDynAuthServDupDisconRequests           Counter32,
       radiusDynAuthServDisconAcks                  Counter32,
       radiusDynAuthServDisconNaks                  Counter32,
       radiusDynAuthServDisconNakAuthOnlyRequests   Counter32,
       radiusDynAuthServDisconNakSessNoContext      Counter32,
       radiusDynAuthServDisconUserSessRemoved       Counter32,
       radiusDynAuthServMalformedDisconRequests     Counter32,
       radiusDynAuthServDisconBadAuthenticators     Counter32,
       radiusDynAuthServDisconPacketsDropped        Counter32,
       radiusDynAuthServCoARequests                 Counter32,
       radiusDynAuthServCoAAuthOnlyRequests         Counter32,
       radiusDynAuthServDupCoARequests              Counter32,
       radiusDynAuthServCoAAcks                     Counter32,
       radiusDynAuthServCoANaks                     Counter32,
       radiusDynAuthServCoANakAuthOnlyRequests      Counter32,
       radiusDynAuthServCoANakSessNoContext         Counter32,
       radiusDynAuthServCoAUserSessChanged          Counter32,
       radiusDynAuthServMalformedCoARequests        Counter32,
       radiusDynAuthServCoABadAuthenticators        Counter32,
       radiusDynAuthServCoAPacketsDropped           Counter32,
       radiusDynAuthServUnknownTypes                Counter32,

radiusDynAuthServerCounterDiscontinuity TimeTicks

}

radiusDynAuthClientIndex OBJECT-TYPE

       SYNTAX     Integer32 (1..2147483647)
       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION
             "A number uniquely identifying each RADIUS Dynamic
              Authorization Client with which this Dynamic
              Authorization Server communicates.  This number is
              allocated by the agent implementing this MIB module
              and is unique in this context."
       ::= { radiusDynAuthClientEntry 1 }

radiusDynAuthClientAddressType OBJECT-TYPE

       SYNTAX     InetAddressType
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The type of IP address of the RADIUS Dynamic
              Authorization Client referred to in this table entry."
       ::= { radiusDynAuthClientEntry 2 }

radiusDynAuthClientAddress OBJECT-TYPE

       SYNTAX     InetAddress
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The IP address value of the RADIUS Dynamic
              Authorization Client referred to in this table entry,
              using the version neutral IP address format.  The type
              of this address is determined by the value of
              the radiusDynAuthClientAddressType object."
       ::= { radiusDynAuthClientEntry 3 }

radiusDynAuthServDisconRequests OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "requests"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
       
             "The number of RADIUS Disconnect-Requests received
              from this Dynamic Authorization Client.  This also
              includes the RADIUS Disconnect-Requests that have a
              Service-Type attribute with value 'Authorize Only'.
              This counter may experience a discontinuity when the
       
              DAS module (re)starts as indicated by the value of
              radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.1, Disconnect Messages (DM)."
       ::= { radiusDynAuthClientEntry 4 }

radiusDynAuthServDisconAuthOnlyRequests OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "requests"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of RADIUS Disconnect-Requests that include
              a Service-Type attribute with value 'Authorize Only'
              received from this Dynamic Authorization Client.  This
              counter may experience a discontinuity when the DAS
              module (re)starts, as indicated by the value of
              radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.1, Disconnect Messages (DM)."
       ::= { radiusDynAuthClientEntry 5 }

radiusDynAuthServDupDisconRequests OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "requests"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of duplicate RADIUS Disconnect-Request
              packets received from this Dynamic Authorization
              Client.  This counter may experience a discontinuity
              when the DAS module (re)starts, as indicated by the
              value of radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.1, Disconnect Messages (DM)."
       ::= { radiusDynAuthClientEntry 6 }

radiusDynAuthServDisconAcks  OBJECT-TYPE
       SYNTAX     Counter32
       UNITS      "replies"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of RADIUS Disconnect-ACK packets sent to
              this Dynamic Authorization Client.  This counter may
              experience a discontinuity when the DAS module
              (re)starts, as indicated by the value of
              radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.1, Disconnect Messages (DM)."
       ::= { radiusDynAuthClientEntry 7 }

radiusDynAuthServDisconNaks OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "replies"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of RADIUS Disconnect-NAK packets
              sent to this Dynamic Authorization Client.  This
              includes the RADIUS Disconnect-NAK packets sent
              with a Service-Type attribute with value 'Authorize
              Only' and the RADIUS Disconnect-NAK packets sent
              because no session context was found.  This counter
              may experience a discontinuity when the DAS module
              (re)starts, as indicated by the value of
              radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.1, Disconnect Messages (DM)."
       ::= { radiusDynAuthClientEntry 8 }

radiusDynAuthServDisconNakAuthOnlyRequests OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "replies"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of RADIUS Disconnect-NAK packets that
              include a Service-Type attribute with value
              'Authorize Only' sent to this Dynamic Authorization
              Client.  This counter may experience a discontinuity
              when the DAS module (re)starts, as indicated by the
              value of radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.1, Disconnect Messages (DM)."
       ::= { radiusDynAuthClientEntry 9 }

radiusDynAuthServDisconNakSessNoContext OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "replies"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of RADIUS Disconnect-NAK packets
              sent to this Dynamic Authorization Client
              because no session context was found.  This counter may
       
              experience a discontinuity when the DAS module
              (re)starts, as indicated by the value of
              radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.1, Disconnect Messages (DM)."
       ::= { radiusDynAuthClientEntry 10 }

radiusDynAuthServDisconUserSessRemoved OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "sessions"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of user sessions removed for the
              Disconnect-Requests received from this
              Dynamic Authorization Client.  Depending on site-
              specific policies, a single Disconnect request
              can remove multiple user sessions.  In cases where
              this Dynamic Authorization Server has no
              knowledge of the number of user sessions that
              are affected by a single request, each such
              Disconnect-Request will count as a single
              affected user session only.  This counter may experience
              a discontinuity when the DAS module (re)starts, as
              indicated by the value of
              radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.1, Disconnect Messages (DM)."
       ::= { radiusDynAuthClientEntry 11 }

radiusDynAuthServMalformedDisconRequests OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "requests"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of malformed RADIUS Disconnect-Request
              packets received from this Dynamic Authorization
              Client.  Bad authenticators and unknown types are not
              included as malformed Disconnect-Requests.  This counter
              may experience a discontinuity when the DAS module
              (re)starts, as indicated by the value of
              radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.1, Disconnect Messages (DM), and
              Section 2.3, Packet Format."
       ::= { radiusDynAuthClientEntry 12 }

radiusDynAuthServDisconBadAuthenticators OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "requests"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of RADIUS Disconnect-Request packets
              that contained an invalid Authenticator field
              received from this Dynamic Authorization Client.  This
              counter may experience a discontinuity when the DAS
              module (re)starts, as indicated by the value of
              radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.1, Disconnect Messages (DM), and
              Section 2.3, Packet Format."
       ::= { radiusDynAuthClientEntry 13 }

radiusDynAuthServDisconPacketsDropped OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "requests"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of incoming Disconnect-Requests
              from this Dynamic Authorization Client silently
              discarded by the server application for some reason
              other than malformed, bad authenticators, or unknown
              types.  This counter may experience a discontinuity
              when the DAS module (re)starts, as indicated by the
              value of radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.1, Disconnect Messages (DM), and
              Section 2.3, Packet Format."
       ::= { radiusDynAuthClientEntry 14 }

radiusDynAuthServCoARequests OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "requests"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of RADIUS CoA-requests received from this
              Dynamic Authorization Client.  This also includes
              the CoA requests that have a Service-Type attribute
              with value 'Authorize Only'.  This counter may
              experience a discontinuity when the DAS module
              (re)starts, as indicated by the value of
              radiusDynAuthServerCounterDiscontinuity."
       
       REFERENCE
             "RFC 3576, Section 2.2, Change-of-Authorization
              Messages (CoA)."
       ::= { radiusDynAuthClientEntry 15 }

radiusDynAuthServCoAAuthOnlyRequests OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "requests"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of RADIUS CoA-requests that include a
              Service-Type attribute with value 'Authorize Only'
              received from this Dynamic Authorization Client.  This
              counter may experience a discontinuity when the DAS
              module (re)starts, as indicated by the value of
              radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.2, Change-of-Authorization
              Messages (CoA)."
       ::= { radiusDynAuthClientEntry 16 }

radiusDynAuthServDupCoARequests OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "requests"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of duplicate RADIUS CoA-Request packets
              received from this Dynamic Authorization Client.  This
              counter may experience a discontinuity when the DAS
              module (re)starts, as indicated by the value of
              radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.2, Change-of-Authorization
              Messages (CoA)."
       ::= { radiusDynAuthClientEntry 17 }

radiusDynAuthServCoAAcks  OBJECT-TYPE
       SYNTAX     Counter32
       UNITS      "replies"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of RADIUS CoA-ACK packets sent to this
              Dynamic Authorization Client.  This counter may
              experience a discontinuity when the DAS module
              (re)starts, as indicated by the value of
              radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.2, Change-of-Authorization
              Messages (CoA)."
       ::= { radiusDynAuthClientEntry 18 }

radiusDynAuthServCoANaks OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "replies"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of RADIUS CoA-NAK packets sent to
              this Dynamic Authorization Client.  This includes
              the RADIUS CoA-NAK packets sent with a Service-Type
              attribute with value 'Authorize Only' and the RADIUS
              CoA-NAK packets sent because no session context was
              found.  This counter may experience a discontinuity
              when the DAS module (re)starts, as indicated by the
              value of radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.2, Change-of-Authorization
              Messages (CoA)."
       ::= { radiusDynAuthClientEntry 19 }

radiusDynAuthServCoANakAuthOnlyRequests OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "replies"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of RADIUS CoA-NAK packets that include a
              Service-Type attribute with value 'Authorize Only'
              sent to this Dynamic Authorization Client.  This counter
              may experience a discontinuity when the DAS module
              (re)starts, as indicated by the value of
              radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.2, Change-of-Authorization
              Messages (CoA)."
       ::= { radiusDynAuthClientEntry 20 }

radiusDynAuthServCoANakSessNoContext OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "replies"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of RADIUS CoA-NAK packets sent to this
              Dynamic Authorization Client because no session context
              was found.  This counter may experience a discontinuity
              when the DAS module (re)starts, as indicated by the
              value of radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.2, Change-of-Authorization
              Messages (CoA)."
       ::= { radiusDynAuthClientEntry 21 }

radiusDynAuthServCoAUserSessChanged OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "sessions"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of user sessions authorization
              changed for the CoA-Requests received from this
              Dynamic Authorization Client.  Depending on site-
              specific policies, a single CoA request can change
              multiple user sessions' authorization.  In cases where
              this Dynamic Authorization Server has no knowledge of
              the number of user sessions that are affected by a
              single request, each such CoA-Request will
              count as a single affected user session only.  This
              counter may experience a discontinuity when the DAS
              module (re)starts, as indicated by the value of
              radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.2, Change-of-Authorization
              Messages (CoA)."
       ::= { radiusDynAuthClientEntry 22 }

radiusDynAuthServMalformedCoARequests OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "requests"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of malformed RADIUS CoA-Request packets
              received from this Dynamic Authorization Client.  Bad
              authenticators and unknown types are not included as
              malformed CoA-Requests.  This counter may experience a
              discontinuity when the DAS module (re)starts, as
              indicated by the value of
              radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.2, Change-of-Authorization
              Messages (CoA), and Section 2.3, Packet Format."
       ::= { radiusDynAuthClientEntry  23 }

radiusDynAuthServCoABadAuthenticators OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "requests"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of RADIUS CoA-Request packets that
              contained an invalid Authenticator field received
              from this Dynamic Authorization Client.  This counter
              may experience a discontinuity when the DAS module
              (re)starts, as indicated by the value of
                radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.2, Change-of-Authorization
              Messages (CoA), and Section 2.3, Packet Format."
       ::= { radiusDynAuthClientEntry 24 }

radiusDynAuthServCoAPacketsDropped OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "requests"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of incoming CoA packets from this
              Dynamic Authorization Client silently discarded
              by the server application for some reason other than
              malformed, bad authenticators, or unknown types.  This
              counter may experience a discontinuity when the DAS
              module (re)starts, as indicated by the value of
              radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.2, Change-of-Authorization
              Messages (CoA), and Section 2.3, Packet Format."
       ::= { radiusDynAuthClientEntry 25 }

radiusDynAuthServUnknownTypes OBJECT-TYPE

       SYNTAX     Counter32
       UNITS      "requests"
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
             "The number of incoming packets of unknown types that
              were received on the Dynamic Authorization port.  This
              counter may experience a discontinuity when the DAS
       
              module (re)starts, as indicated by the value of
              radiusDynAuthServerCounterDiscontinuity."
       REFERENCE
             "RFC 3576, Section 2.3, Packet Format."
       ::= { radiusDynAuthClientEntry 26 }

radiusDynAuthServerCounterDiscontinuity OBJECT-TYPE

       SYNTAX TimeTicks
       UNITS  "hundredths of a second"
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
             "The time (in hundredths of a second) since the
              last counter discontinuity.  A discontinuity may
              be the result of a reinitialization of the DAS
              module within the managed entity."
       ::= { radiusDynAuthClientEntry 27 }

-- conformance information

radiusDynAuthServerMIBConformance
       OBJECT IDENTIFIER ::= { radiusDynAuthServerMIB 2 }
radiusDynAuthServerMIBCompliances
       OBJECT IDENTIFIER ::= { radiusDynAuthServerMIBConformance 1 }
radiusDynAuthServerMIBGroups
       OBJECT IDENTIFIER ::= { radiusDynAuthServerMIBConformance 2 }

-- compliance statements

radiusAuthServerMIBCompliance MODULE-COMPLIANCE

       STATUS  current
       DESCRIPTION
             "The compliance statement for entities implementing
              the RADIUS Dynamic Authorization Server.  Implementation
              of this module is for entities that support IPv4 and/or
              IPv6."
       MODULE  -- this module
       MANDATORY-GROUPS { radiusDynAuthServerMIBGroup }
       
       OBJECT             radiusDynAuthClientAddressType
       SYNTAX             InetAddressType { ipv4(1), ipv6(2) }
       DESCRIPTION
           "An implementation is only required to support IPv4 and
            globally unique IPv6 addresses."
       
       OBJECT             radiusDynAuthClientAddress
       SYNTAX             InetAddress (SIZE(4|16))

DESCRIPTION

"An implementation is only required to support IPv4 and

globally unique IPv6 addresses."

       GROUP              radiusDynAuthServerAuthOnlyGroup
       DESCRIPTION
             "Only required for Dynamic Authorization Clients that
              are supporting Service-Type attributes with value
              'Authorize-Only'."
       
       GROUP              radiusDynAuthServerNoSessGroup
       DESCRIPTION
             "This group is not required if the Dynamic
              Authorization Server cannot easily determine whether
              a session exists (e.g., in case of a RADIUS
              proxy)."
       
       ::= { radiusDynAuthServerMIBCompliances 1 }

-- units of conformance

radiusDynAuthServerMIBGroup OBJECT-GROUP

       OBJECTS { radiusDynAuthServerDisconInvalidClientAddresses,
                 radiusDynAuthServerCoAInvalidClientAddresses,
                 radiusDynAuthServerIdentifier,
                 radiusDynAuthClientAddressType,
                 radiusDynAuthClientAddress,
                 radiusDynAuthServDisconRequests,
                 radiusDynAuthServDupDisconRequests,
                 radiusDynAuthServDisconAcks,
                 radiusDynAuthServDisconNaks,
                 radiusDynAuthServDisconUserSessRemoved,
                 radiusDynAuthServMalformedDisconRequests,
                 radiusDynAuthServDisconBadAuthenticators,
                 radiusDynAuthServDisconPacketsDropped,
                 radiusDynAuthServCoARequests,
                 radiusDynAuthServDupCoARequests,
                 radiusDynAuthServCoAAcks,
                 radiusDynAuthServCoANaks,
                 radiusDynAuthServCoAUserSessChanged,
                 radiusDynAuthServMalformedCoARequests,
                 radiusDynAuthServCoABadAuthenticators,
                 radiusDynAuthServCoAPacketsDropped,
                 radiusDynAuthServUnknownTypes,
                 radiusDynAuthServerCounterDiscontinuity
               }
       STATUS  current
       DESCRIPTION
             "The collection of objects providing management of
              a RADIUS Dynamic Authorization Server."
       ::= { radiusDynAuthServerMIBGroups 1 }

radiusDynAuthServerAuthOnlyGroup OBJECT-GROUP

       OBJECTS { radiusDynAuthServDisconAuthOnlyRequests,
                 radiusDynAuthServDisconNakAuthOnlyRequests,
                 radiusDynAuthServCoAAuthOnlyRequests,
                 radiusDynAuthServCoANakAuthOnlyRequests
               }
       STATUS  current
       DESCRIPTION
             "The collection of objects supporting the RADIUS
              messages including Service-Type attribute with
              value 'Authorize Only'."
       ::= { radiusDynAuthServerMIBGroups 2 }

radiusDynAuthServerNoSessGroup OBJECT-GROUP

       OBJECTS { radiusDynAuthServDisconNakSessNoContext,
                 radiusDynAuthServCoANakSessNoContext
               }
       STATUS  current
       DESCRIPTION
             "The collection of objects supporting the RADIUS
              messages that are referring to non-existing sessions."
       ::= { radiusDynAuthServerMIBGroups 3 }

END

5. Security Considerations

There are no management objects defined in this MIB module that have a MAX-ACCESS clause of read-write and/or read-create. So, if this MIB module is implemented correctly, then there is no risk that an intruder can alter or create any management objects of this MIB module via direct SNMP SET operations.

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:

   radiusDynAuthClientAddress and radiusDynAuthClientAddressType

These can be used to determine the address of the DAC with which the DAS is communicating. This information could be useful in mounting an attack on the DAC.

   radiusDynAuthServerIdentifier

This can be used to determine the Identifier of the DAS. This information could be useful in impersonating the DAS.

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 implementers 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.

6. IANA Considerations

The IANA has assigned OID number 146 under mib-2.

7. Acknowledgements

The authors would like to acknowledge the following people for their comments on this document: Bernard Aboba, Alan DeKok, David Nelson, Anjaneyulu Pata, Dan Romascanu, Juergen Schoenwaelder, Greg Weber, Bert Wijnen, and Glen Zorn.

8. References

8.1. 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., and J. Schoenwaelder,
              "Structure of Management Information Version 2 (SMIv2)",
              STD 58, RFC 2578, April 1999.
   
   [RFC2579]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
              "Textual Conventions for SMIv2", STD 58, RFC 2579, April
              1999.
   
   [RFC2580]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
              "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", STD 62, RFC 3411,
              December 2002.
   
   [RFC3576]  Chiba, M., Dommety, G., Eklund, M., Mitton, D., and B.
              Aboba, "Dynamic Authorization Extensions to Remote
              Authentication Dial In User Service (RADIUS)", RFC 3576,
              July 2003.
   
   [RFC4001]  Daniele, M., Haberman, B., Routhier, S., and J.
              Schoenwaelder, "Textual Conventions for Internet Network
              Addresses", RFC 4001, February 2005.

8.2. Informative References

   [RFC2865]  Rigney, C., Willens, S., Rubens, A., and W. Simpson,
              "Remote Authentication Dial In User Service (RADIUS)", RFC
              2865, June 2000.
   
   [RFC3410]  Case, J., Mundy, R., Partain, D., and B. Stewart,
              "Introduction and Applicability Statements for Internet-
              Standard Management Framework", RFC 3410, December 2002.
   
   [RFC4668]  Nelson, D., "RADIUS Authentication Client MIB for IPv6",
              RFC 4668, August 2006.
   
   [RFC4669]  Nelson, D., "RADIUS Authentication Server MIB for IPv6",
              RFC 4669, August 2006.
   
   [RFC4670]  Nelson, D., "RADIUS Accounting Client MIB for IPv6", RFC
              4670, August 2006.
   
   [RFC4671]  Nelson, D., "RADIUS Accounting Server MIB for IPv6", RFC
              4671, August 2006.
   
   [RFC4672]  De Cnodder, S., Jonnala, N., and M. Chiba, "RADIUS Dynamic
              Authorization Client MIB", RFC 4672, September 2006.

Authors' Addresses

Stefaan De Cnodder
Alcatel
Francis Wellesplein 1
B-2018 Antwerp
Belgium

   Phone: +32 3 240 85 15
   EMail: stefaan.de_cnodder@alcatel.be

Nagi Reddy Jonnala
Cisco Systems, Inc.
Divyasree Chambers, B Wing, O'Shaugnessy Road Bangalore-560027, India

   Phone: +91 94487 60828
   EMail: njonnala@cisco.com

Murtaza Chiba
Cisco Systems, Inc.
170 West Tasman Dr.
San Jose CA, 95134

   Phone: +1 408 525 7198
   EMail: mchiba@cisco.com

Full Copyright Statement

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Acknowledgement

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

RADIUS Dynamic Authorization Server MIB

Status of This Memo

Copyright Notice

Abstract

Table of Contents

1. Introduction

1.1. Requirements Notation

1.2. Terminology

2. The Internet-Standard Management Framework

3. Overview

Figure 1. Mapping of clients and servers

4. RADIUS Dynamic Authorization Server MIB Definitions

RADIUS-DYNAUTH-SERVER-MIB DEFINITIONS ::= BEGIN

radiusDynAuthServerMIBObjects OBJECT IDENTIFIER ::=

{ radiusDynAuthServerMIB 1 }

radiusDynAuthServerScalars OBJECT IDENTIFIER ::=

{ radiusDynAuthServerMIBObjects 1 }

radiusDynAuthServerCounterDiscontinuity TimeTicks

}

-- conformance information

-- compliance statements

-- units of conformance

END

5. Security Considerations

6. IANA Considerations

7. Acknowledgements

8. References

8.1. Normative References

8.2. Informative References

Authors' Addresses

Full Copyright Statement

Intellectual Property

Acknowledgement