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RFC 5676 - Definitions of Managed Objects for Mapping SYSLOG Mes


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Network Working Group                                   J. Schoenwaelder
Request for Comments: 5676                      Jacobs University Bremen
Category: Standards Track                                       A. Clemm
                                                           Cisco Systems
                                                             A. Karmakar
                                             Cisco Systems India Pvt Ltd
                                                            October 2009

     Definitions of Managed Objects for Mapping SYSLOG Messages to
        Simple Network Management Protocol (SNMP) Notifications

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 defines a mapping of SYSLOG messages to Simple
   Network Management Protocol (SNMP) notifications.

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) 2009 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2
   2.  The Internet-Standard Management Framework . . . . . . . . . .  2
   3.  Conventions  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   4.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   5.  Relationship to Other MIB Modules  . . . . . . . . . . . . . .  4
   6.  Relationship to the SNMP Notification to SYSLOG Mapping  . . .  6
   7.  Definitions  . . . . . . . . . . . . . . . . . . . . . . . . .  5
   8.  Usage Example  . . . . . . . . . . . . . . . . . . . . . . . . 18
   9.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 18
   10. Security Considerations  . . . . . . . . . . . . . . . . . . . 19
   11. Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 20
   12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 20
     12.1.  Normative References  . . . . . . . . . . . . . . . . . . 20
     12.2.  Informative References  . . . . . . . . . . . . . . . . . 21

1.  Introduction

   SNMP ([RFC3410], [RFC3411]) and SYSLOG [RFC5424] are two widely used
   protocols to communicate event notifications.  Although co-existence
   of several management protocols in one operational environment is
   possible, certain environments require that all event notifications
   be collected by a single system daemon, such as a SYSLOG collector or
   an SNMP notification receiver, via a single management protocol.  In
   such environments, it is necessary to translate event notifications
   between management protocols.

   This document defines an SNMP MIB module to represent SYSLOG messages
   and to send SYSLOG messages as SNMP notifications to SNMP
   notification receivers.

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
   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].

3.  Conventions

   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].

4.  Overview

   SYSLOG messages are translated to SNMP by a SYSLOG-to-SNMP
   translator.  Such a translator acts as a SYSLOG collector [RFC5424]
   and implements a MIB module according to the SNMP architecture
   [RFC3411].  The translator might be tightly coupled to an SNMP agent
   or it might interface with an SNMP agent via a subagent protocol.

   After initialization, the SYSLOG-to-SNMP translator will listen for
   SYSLOG messages.  On receiving a message, the message will be parsed
   to extract information as described in the MIB module.  A conceptual
   table is populated with information extracted from the SYSLOG
   message, and finally a notification may be generated.

   The MIB module is organized into a group of scalars and two tables.
   The syslogMsgControl group contains two scalars controlling the
   maximum size of SYSLOG messages recorded in the tables and also
   controlling whether SNMP notifications are generated for SYSLOG
   messages.

   --syslogMsgObjects(1)
     |
     +--syslogMsgControl(1)
        |
        +-- Unsigned32 syslogMsgTableMaxSize(1)
        +-- TruthValue syslogMsgEnableNotifications(2)

   The syslogMsgTable contains one entry for each recorded SYSLOG
   message.  The basic fields of SYSLOG messages as well as message
   properties are represented in different columns of the conceptual
   table.

   --syslogMsgObjects(1)
     |
     +--syslogMsgTable(2)
        |
        +--syslogMsgEntry(1) [syslogMsgIndex]
           |
           +-- Unsigned32      syslogMsgIndex(1)
           +-- SyslogFacility  syslogMsgFacility(2)
           +-- SyslogSeverity  syslogMsgSeverity(3)
           +-- Unsigned32      syslogMsgVersion(4)

           +-- SyslogTimeStamp syslogMsgTimeStamp(5)
           +-- DisplayString   syslogMsgHostName(6)
           +-- DisplayString   syslogMsgAppName(7)
           +-- DisplayString   syslogMsgProcID(8)
           +-- DisplayString   syslogMsgMsgID(9)
           +-- Unsigned32      syslogMsgSDParams(10)
           +-- OctetString     syslogMsgMsg(11)

   The syslogMsgSDTable contains one entry for each structured data
   element parameter contained in a SYSLOG message.  Since structured
   data elements are optional, the relationship between the
   syslogMsgTable and the syslogMsgSDTable ranges from one-to-zero to
   one-to-many.

   --syslogMsgObjects(1)
     |
     +--syslogMsgSDTable(3)
        |
        +--syslogMsgSDEntry(1)       [syslogMsgIndex,
           |                          syslogMsgSDParamIndex,
           |                          syslogMsgSDID,
           |                          syslogMsgSDParamName]
           |
           +-- Unsigned32             syslogMsgSDParamIndex(1)
           +-- DisplayString          syslogMsgSDID(2)
           +-- DisplayString          syslogMsgSDParamName(3)
           +-- SyslogParamValueString syslogMsgSDParamValue(4)

5.  Relationship to Other MIB Modules

   The NOTIFICATION-LOG-MIB [RFC3014] provides a generic mechanism for
   logging SNMP notifications in order to deal with lost SNMP
   notifications, e.g., due to transient communication problems.
   Applications can poll the notification log to verify that they have
   not missed important SNMP notifications.

   The MIB module defined in this memo provides a mechanism for logging
   SYSLOG notifications.  This additional SYSLOG notification log is
   provided because (a) SYSLOG messages might not lead to SNMP
   notification (this is configurable) and (b) SNMP notifications might
   not carry all information associated with a SYSLOG notification.

   The MIB module IMPORTS objects from SNMPv2-SMI [RFC2578], SNMPv2-TC
   [RFC2579], SNMPv2-CONF [RFC2580], SNMP-FRAMEWORK-MIB [RFC3411], and
   SYSLOG-TC-MIB [RFC5427].

   The textual convention SyslogParamValueString uses the UTF-8
   transformation format of the ISO/IEC IS 10646-1 character set defined
   in [RFC3629].

6.  Relationship to the SNMP Notification to SYSLOG Mapping

   A companion document [RFC5675] defines a mapping of SNMP
   notifications to SYSLOG messages.  This section discusses the
   possibilities of using both specifications in combination.

   A SYSLOG collector implementing the SYSLOG-MSG-MIB module and the
   mapping of SNMP notifications to SYSLOG messages may be configured to
   translate received SYSLOG messages containing SNMP notifications back
   into the original SNMP notification.  In this case, the relevant
   tables of the SYSLOG-MSG-MIB will not be populated for SYSLOG
   messages carrying SNMP notifications.  This configuration allows
   operators to build a forwarding chain where SNMP notifications are
   "tunneled" through SYSLOG messages.  Due to size restrictions of the
   SYSLOG transports and the more verbose textual encoding used by
   SYSLOG, there is a possibility that SNMP notification content will
   get truncated when tunneled through SYSLOG, and thus the resulting
   SNMP notification may be incomplete.

   An SNMP management application supporting the SYSLOG-MSG-MIB and the
   mapping of SNMP notifications to SYSLOG messages may process
   information from the SYSLOG-MSG-MIB in order to emit a SYSLOG message
   representing the SYSLOG message recorded in the SYSLOG-MSG-MIB
   module.  This configuration allows operators to build a forwarding
   chain where SYSLOG messages are "tunneled" through SNMP messages.  A
   notification receiver can determine whether a syslogMsgNotification
   contained all structured data element parameters of a SYSLOG message.
   In case parameters are missing, a forwarding application MUST
   retrieve the missing parameters from the SYSLOG-MSG-MIB.  Regular
   polling of the SYSLOG-MSG-MIB can be used to take care of any lost
   SNMP notifications.

7.  Definitions

 SYSLOG-MSG-MIB DEFINITIONS ::= BEGIN

 IMPORTS
     MODULE-IDENTITY, OBJECT-TYPE, NOTIFICATION-TYPE, Unsigned32, mib-2
         FROM SNMPv2-SMI
     TEXTUAL-CONVENTION, DisplayString, TruthValue
         FROM SNMPv2-TC
     OBJECT-GROUP, NOTIFICATION-GROUP, MODULE-COMPLIANCE
         FROM SNMPv2-CONF
     SyslogFacility, SyslogSeverity

         FROM SYSLOG-TC-MIB;

 syslogMsgMib MODULE-IDENTITY
     LAST-UPDATED "200908130800Z"
     ORGANIZATION "IETF OPSAWG Working Group"
     CONTACT-INFO
         "Juergen Schoenwaelder
          <j.schoenwaelder@jacobs-university.de>
          Jacobs University Bremen
          Campus Ring 1
          28757 Bremen
          Germany

          Alexander Clemm
          <alex@cisco.com>
          Cisco Systems
          170 West Tasman Drive
          San Jose, CA 95134-1706
          USA

          Anirban Karmakar
          <akarmaka@cisco.com>
          Cisco Systems India Pvt Ltd
          SEZ Unit, Cessna Business Park,
          Sarjapur Marathahalli ORR,
          Bangalore, Karnataka 560103
          India"

     DESCRIPTION
         "This MIB module represents SYSLOG messages as SNMP objects.

          Copyright (c) 2009 IETF Trust and the persons identified as
          authors of the code.  All rights reserved.

          Redistribution and use in source and binary forms, with or
          without modification, is permitted pursuant to, and subject
          to the license terms contained in, the Simplified BSD License
          set forth in Section 4.c of the IETF Trust's Legal Provisions
          Relating to IETF Documents
          (http://trustee.ietf.org/license-info).

          This version of this MIB module is part of RFC 5676; see
          the RFC itself for full legal notices."

     REVISION "200908130800Z"
     DESCRIPTION
         "Initial version issued as part of RFC 5676."
     ::= { mib-2 192 }

 -- textual convention definitions

 SyslogTimeStamp ::= TEXTUAL-CONVENTION
     DISPLAY-HINT "2d-1d-1d,1d:1d:1d.3d,1a1d:1d"
     STATUS       current
     DESCRIPTION
        "A date-time specification.  This type is similar to the
         DateAndTime type defined in the SNMPv2-TC, except the
         subsecond granulation is microseconds instead of
         deciseconds and a zero-length string can be used
         to indicate a missing value.

         field  octets  contents                  range
         -----  ------  --------                  -----
           1      1-2   year*                     0..65536
           2       3    month                     1..12
           3       4    day                       1..31
           4       5    hour                      0..23
           5       6    minutes                   0..59
           6       7    seconds                   0..60
                        (use 60 for leap-second)
           7     8-10   microseconds*             0..999999
           8      11    direction from UTC        '+' / '-'
           9      12    hours from UTC*           0..13
          10      13    minutes from UTC          0..59

         * Notes:
         - the value of year is in network-byte order
         - the value of microseconds is in network-byte order
         - daylight saving time in New Zealand is +13

         For example, Tuesday May 26, 1992 at 1:30:15 PM EDT would be
         displayed as:

                         1992-5-26,13:30:15.0,-4:0

         Note that if only local time is known, then timezone
         information (fields 11-13) is not present."
     SYNTAX      OCTET STRING (SIZE (0 | 10 | 13))

 SyslogParamValueString ::= TEXTUAL-CONVENTION
     DISPLAY-HINT "65535t"
     STATUS       current
     DESCRIPTION
        "The value of a SYSLOG SD-PARAM is represented using the
         ISO/IEC IS 10646-1 character set, encoded as an octet string
         using the UTF-8 transformation format described in RFC 3629.

         Since additional code points are added by amendments to the
         10646 standard from time to time, implementations must be
         prepared to encounter any code point from 0x00000000 to
         0x7fffffff.  Byte sequences that do not correspond to the
         valid UTF-8 encoding of a code point or that are outside this
         range are prohibited.  Similarly, overlong UTF-8 sequences
         are prohibited.

         UTF-8 may require multiple bytes to represent a single
         character / code point; thus, the length of this object in
         octets may be different from the number of characters
         encoded.  Similarly, size constraints refer to the number of
         encoded octets, not the number of characters represented by
         an encoding."
     REFERENCE
        "RFC 3629: UTF-8, a transformation format of ISO 10646"
     SYNTAX     OCTET STRING

 -- object definitions

 syslogMsgNotifications OBJECT IDENTIFIER ::= { syslogMsgMib 0 }
 syslogMsgObjects       OBJECT IDENTIFIER ::= { syslogMsgMib 1 }
 syslogMsgConformance   OBJECT IDENTIFIER ::= { syslogMsgMib 2 }

 syslogMsgControl       OBJECT IDENTIFIER ::= { syslogMsgObjects 1 }

 syslogMsgTableMaxSize OBJECT-TYPE
     SYNTAX      Unsigned32
     MAX-ACCESS  read-write
     STATUS      current
     DESCRIPTION
        "The maximum number of SYSLOG messages that may be held in
         syslogMsgTable.  A particular setting does not guarantee that
         there is sufficient memory available for the maximum number
         of table entries indicated by this object.  A value of 0 means
         no fixed limit.

         If an application reduces the limit while there are SYSLOG
         messages in the syslogMsgTable, the SYSLOG messages that are
         in the syslogMsgTable for the longest time MUST be discarded
         to bring the table down to the new limit.

         The value of this object should be kept in nonvolatile
         memory."
     DEFVAL      { 0 }
     ::= { syslogMsgControl 1 }

 syslogMsgEnableNotifications OBJECT-TYPE

     SYNTAX      TruthValue
     MAX-ACCESS  read-write
     STATUS      current
     DESCRIPTION
        "Indicates whether syslogMsgNotification notifications are
         generated.

         The value of this object should be kept in nonvolatile
         memory."
     DEFVAL      { false }
     ::= { syslogMsgControl 2 }

 syslogMsgTable OBJECT-TYPE
     SYNTAX      SEQUENCE OF SyslogMsgEntry
     MAX-ACCESS  not-accessible
     STATUS      current
     DESCRIPTION
        "A table containing recent SYSLOG messages.  The size of the
         table is controlled by the syslogMsgTableMaxSize object."
     ::= { syslogMsgObjects 2 }

 syslogMsgEntry OBJECT-TYPE
     SYNTAX      SyslogMsgEntry
     MAX-ACCESS  not-accessible
     STATUS      current
     DESCRIPTION
        "An entry of the syslogMsgTable."
     INDEX { syslogMsgIndex }
     ::= { syslogMsgTable 1 }

 SyslogMsgEntry ::= SEQUENCE {
     syslogMsgIndex      Unsigned32,
     syslogMsgFacility   SyslogFacility,
     syslogMsgSeverity   SyslogSeverity,
     syslogMsgVersion    Unsigned32,
     syslogMsgTimeStamp  SyslogTimeStamp,
     syslogMsgHostName   DisplayString,
     syslogMsgAppName    DisplayString,
     syslogMsgProcID     DisplayString,
     syslogMsgMsgID      DisplayString,
     syslogMsgSDParams   Unsigned32,
     syslogMsgMsg        OCTET STRING
 }

 syslogMsgIndex OBJECT-TYPE
     SYNTAX      Unsigned32 (1..4294967295)
     MAX-ACCESS  not-accessible
     STATUS      current

     DESCRIPTION
        "A monotonically increasing number used to identify entries in
         the syslogMsgTable.  When syslogMsgIndex reaches the maximum
         value (4294967295), the value wraps back to 1.

         Applications periodically polling the syslogMsgTable for new
         entries should take into account that a complete rollover of
         syslogMsgIndex will happen if more than 4294967294 messages
         are received during a poll interval."
     ::= { syslogMsgEntry 1 }

 syslogMsgFacility OBJECT-TYPE
     SYNTAX      SyslogFacility
     MAX-ACCESS  read-only
     STATUS      current
     DESCRIPTION
        "The facility of the SYSLOG message."
     REFERENCE
        "RFC 5424: The Syslog Protocol (Section 6.2.1)
         RFC 5427: Textual Conventions for Syslog Management"
     ::= { syslogMsgEntry 2 }

 syslogMsgSeverity OBJECT-TYPE
     SYNTAX      SyslogSeverity
     MAX-ACCESS  read-only
     STATUS      current
     DESCRIPTION
        "The severity of the SYSLOG message"
     REFERENCE
        "RFC 5424: The Syslog Protocol (Section 6.2.1)
         RFC 5427: Textual Conventions for Syslog Management"
     ::= { syslogMsgEntry 3 }

 syslogMsgVersion OBJECT-TYPE
     SYNTAX      Unsigned32 (0..999)
     MAX-ACCESS  read-only
     STATUS      current
     DESCRIPTION
        "The version of the SYSLOG message.  A value of 0 indicates
         that the version is unknown."
     REFERENCE
        "RFC 5424: The Syslog Protocol (Section 6.2.2)"
     ::= { syslogMsgEntry 4 }

 syslogMsgTimeStamp OBJECT-TYPE
     SYNTAX      SyslogTimeStamp
     MAX-ACCESS  read-only
     STATUS      current

     DESCRIPTION
        "The timestamp of the SYSLOG message.  A zero-length
         string is returned if the timestamp is unknown."
     REFERENCE
        "RFC 5424: The Syslog Protocol (Section 6.2.3)"
     ::= { syslogMsgEntry 5 }

 syslogMsgHostName OBJECT-TYPE
     SYNTAX      DisplayString (SIZE (0..255))
     MAX-ACCESS  read-only
     STATUS      current
     DESCRIPTION
        "The hostname and the (optional) domain name of the SYSLOG
         message.  A zero-length string indicates an unknown hostname.
         The SYSLOG protocol specification constrains this string to
         printable US-ASCII code points."
     REFERENCE
        "RFC 5424: The Syslog Protocol (Section 6.2.4)"
     ::= { syslogMsgEntry 6 }

 syslogMsgAppName OBJECT-TYPE
     SYNTAX      DisplayString (SIZE (0..48))
     MAX-ACCESS  read-only
     STATUS      current
     DESCRIPTION
        "The app-name of the SYSLOG message.  A zero-length string
         indicates an unknown app-name.  The SYSLOG protocol
         specification constrains this string to printable US-ASCII
         code points."
     REFERENCE
        "RFC 5424: The Syslog Protocol (Section 6.2.5)"
     ::= { syslogMsgEntry 7 }

 syslogMsgProcID OBJECT-TYPE
     SYNTAX      DisplayString (SIZE (0..128))
     MAX-ACCESS  read-only
     STATUS      current
     DESCRIPTION
        "The procid of the SYSLOG message.  A zero-length string
         indicates an unknown procid.  The SYSLOG protocol
         specification constrains this string to printable
         US-ASCII code points."
     REFERENCE
        "RFC 5424: The Syslog Protocol (Section 6.2.6)"
     ::= { syslogMsgEntry 8 }

 syslogMsgMsgID OBJECT-TYPE
     SYNTAX      DisplayString (SIZE (0..32))

     MAX-ACCESS  read-only
     STATUS      current
     DESCRIPTION
        "The msgid of the SYSLOG message.  A zero-length string
         indicates an unknown msgid.  The SYSLOG protocol specification
         constrains this string to printable US-ASCII code points."
     REFERENCE
        "RFC 5424: The Syslog Protocol (Section 6.2.7)"
     ::= { syslogMsgEntry 9 }

 syslogMsgSDParams OBJECT-TYPE
     SYNTAX      Unsigned32
     MAX-ACCESS  read-only
     STATUS      current
     DESCRIPTION
        "The total number of structured data element parameters
         carried in the SYSLOG message.  This number effectively
         indicates the number of entries in the syslogMsgSDTable.
         It can be used, for example, by a notification receiver
         to determine whether a notification carried all
         structured data element parameters of a SYSLOG message."
     ::= { syslogMsgEntry 10 }

 syslogMsgMsg OBJECT-TYPE
     SYNTAX      OCTET STRING
     MAX-ACCESS  read-only
     STATUS      current
     DESCRIPTION
        "The message part of the SYSLOG message.  The syntax does not
         impose a size restriction.  Implementations of this MIB module
         may truncate the message part of the SYSLOG message such that
         it fits into the size constraints imposed by the implementation
         environment.  Such truncations can also happen elsewhere in the
         SYSLOG forwarding chain.

         If the first octets contain the value 'EFBBBF'h, then the rest
         of the message is a UTF-8 string.  Since SYSLOG messages may be
         truncated at arbitrary octet boundaries during forwarding, the
         message may contain invalid UTF-8 encodings at the end."
     REFERENCE
        "RFC 5424: The Syslog Protocol (Sections 6.1 and 6.4)"
     ::= { syslogMsgEntry 11 }

 syslogMsgSDTable OBJECT-TYPE
     SYNTAX      SEQUENCE OF SyslogMsgSDEntry
     MAX-ACCESS  not-accessible
     STATUS      current
     DESCRIPTION

        "A table containing structured data elements of SYSLOG
         messages."
     ::= { syslogMsgObjects 3 }

 syslogMsgSDEntry OBJECT-TYPE
     SYNTAX      SyslogMsgSDEntry
     MAX-ACCESS  not-accessible
     STATUS      current
     DESCRIPTION
        "An entry of the syslogMsgSDTable."
     INDEX { syslogMsgIndex, syslogMsgSDParamIndex,
             syslogMsgSDID, syslogMsgSDParamName }
     ::= { syslogMsgSDTable 1 }

 SyslogMsgSDEntry ::= SEQUENCE {
     syslogMsgSDParamIndex  Unsigned32,
     syslogMsgSDID          DisplayString,
     syslogMsgSDParamName   DisplayString,
     syslogMsgSDParamValue  SyslogParamValueString
 }

 syslogMsgSDParamIndex OBJECT-TYPE
     SYNTAX      Unsigned32 (1..4294967295)
     MAX-ACCESS  not-accessible
     STATUS      current
     DESCRIPTION
        "This object indexes the structured data element parameters
         contained in a SYSLOG message.  The first structured data
         element parameter has the index value 1, and subsequent
         parameters are indexed by incrementing the index of the
         previous parameter.  The index increases across structured
         data element boundaries so that the value reflects the
         position of a structured data element parameter in a
         SYSLOG message."
     REFERENCE
        "RFC 5424: The Syslog Protocol (Section 6.3.3)"
     ::= { syslogMsgSDEntry 1 }

 syslogMsgSDID OBJECT-TYPE
     SYNTAX      DisplayString (SIZE (1..32))
     MAX-ACCESS  not-accessible
     STATUS      current
     DESCRIPTION
        "The name (SD-ID) of a structured data element.  The SYSLOG
         protocol specification constrains this string to printable
         US-ASCII code points."
     REFERENCE
        "RFC 5424: The Syslog Protocol (Section 6.3.2)"

     ::= { syslogMsgSDEntry 2 }

 syslogMsgSDParamName OBJECT-TYPE
     SYNTAX      DisplayString (SIZE (1..32))
     MAX-ACCESS  not-accessible
     STATUS      current
     DESCRIPTION
        "The name of a parameter of the structured data element.  The
         SYSLOG protocol specification constrains this string to
         printable US-ASCII code points."
     REFERENCE
        "RFC 5424: The Syslog Protocol (Section 6.3.3)"
     ::= { syslogMsgSDEntry 3 }

 syslogMsgSDParamValue OBJECT-TYPE
     SYNTAX      SyslogParamValueString
     MAX-ACCESS  read-only
     STATUS      current
     DESCRIPTION
        "The value of the parameter of a SYSLOG message identified by
         the index of this table.  The value is stored in the unescaped
         format."
     REFERENCE
        "RFC 5424: The Syslog Protocol (Section 6.3.3)"
     ::= { syslogMsgSDEntry 4 }

 -- notification definitions

 syslogMsgNotification NOTIFICATION-TYPE
     OBJECTS     { syslogMsgFacility, syslogMsgSeverity,
                   syslogMsgVersion, syslogMsgTimeStamp,
                   syslogMsgHostName, syslogMsgAppName,
                   syslogMsgProcID, syslogMsgMsgID,
                   syslogMsgSDParams, syslogMsgMsg }
     STATUS      current
     DESCRIPTION
        "The syslogMsgNotification is generated when a new SYSLOG
         message is received and the value of
         syslogMsgGenerateNotifications is true.

         Implementations may add syslogMsgSDParamValue objects as long
         as the resulting notification fits into the size constraints
         imposed by the implementation environment and the notification
         message size constraints imposed by maxMessageSize [RFC3412]
         and SNMP transport mappings."
     ::= { syslogMsgNotifications 1 }

 -- conformance statements

 syslogMsgGroups      OBJECT IDENTIFIER ::= { syslogMsgConformance 1 }
 syslogMsgCompliances OBJECT IDENTIFIER ::= { syslogMsgConformance 2 }

 syslogMsgFullCompliance MODULE-COMPLIANCE
     STATUS      current
     DESCRIPTION
        "The compliance statement for implementations of the
         SYSLOG-MSG-MIB."
     MODULE      -- this module
     MANDATORY-GROUPS {
         syslogMsgGroup,
         syslogMsgSDGroup,
         syslogMsgControlGroup,
         syslogMsgNotificationGroup
     }
     ::= { syslogMsgCompliances 1 }

 syslogMsgReadOnlyCompliance MODULE-COMPLIANCE
     STATUS      current
     DESCRIPTION
        "The compliance statement for implementations of the
         SYSLOG-MSG-MIB that do not support read-write access."
     MODULE      -- this module
     MANDATORY-GROUPS {
         syslogMsgGroup,
         syslogMsgSDGroup,
         syslogMsgControlGroup,
         syslogMsgNotificationGroup
     }
     OBJECT syslogMsgTableMaxSize
        MIN-ACCESS  read-only
        DESCRIPTION
           "Write access is not required."
     OBJECT syslogMsgEnableNotifications
        MIN-ACCESS  read-only
        DESCRIPTION
           "Write access is not required."
     ::= { syslogMsgCompliances 2 }

 syslogMsgNotificationCompliance MODULE-COMPLIANCE
     STATUS      current
     DESCRIPTION
        "The compliance statement for implementations of the
         SYSLOG-MSG-MIB that do only generate notifications and do not
         provide a table to allow read access to SYSLOG message
         details."
     MODULE      -- this module
     MANDATORY-GROUPS {

         syslogMsgGroup,
         syslogMsgSDGroup,
         syslogMsgNotificationGroup
     }
     OBJECT      syslogMsgFacility
     MIN-ACCESS  accessible-for-notify
     DESCRIPTION
         "Read access is not required."
     OBJECT      syslogMsgSeverity
     MIN-ACCESS  accessible-for-notify
     DESCRIPTION
        "Read access is not required."
     OBJECT      syslogMsgVersion
     MIN-ACCESS  accessible-for-notify
     DESCRIPTION
        "Read access is not required."
     OBJECT      syslogMsgTimeStamp
     MIN-ACCESS  accessible-for-notify
     DESCRIPTION
        "Read access is not required."
     OBJECT      syslogMsgHostName
     MIN-ACCESS  accessible-for-notify
     DESCRIPTION
        "Read access is not required."
     OBJECT      syslogMsgAppName
     MIN-ACCESS  accessible-for-notify
     DESCRIPTION
        "Read access is not required."
     OBJECT      syslogMsgProcID
     MIN-ACCESS  accessible-for-notify
     DESCRIPTION
        "Read access is not required."
     OBJECT      syslogMsgMsgID
     MIN-ACCESS  accessible-for-notify
     DESCRIPTION
        "Read access is not required."
     OBJECT      syslogMsgSDParams
     MIN-ACCESS  accessible-for-notify
     DESCRIPTION
        "Read access is not required."
     OBJECT      syslogMsgMsg
     MIN-ACCESS  accessible-for-notify
     DESCRIPTION
        "Read access is not required."
     OBJECT      syslogMsgSDParamValue
     MIN-ACCESS  accessible-for-notify
     DESCRIPTION
        "Read access is not required."

     ::= { syslogMsgCompliances 3 }

 syslogMsgNotificationGroup NOTIFICATION-GROUP
     NOTIFICATIONS {
         syslogMsgNotification
     }
     STATUS      current
     DESCRIPTION
        "The notifications emitted by this MIB module."
     ::= { syslogMsgGroups 1 }

 syslogMsgGroup OBJECT-GROUP
     OBJECTS {
         -- syslogMsgIndex,
         syslogMsgFacility,
         syslogMsgSeverity,
         syslogMsgVersion,
         syslogMsgTimeStamp,
         syslogMsgHostName,
         syslogMsgAppName,
         syslogMsgProcID,
         syslogMsgMsgID,
         syslogMsgSDParams,
         syslogMsgMsg
     }
     STATUS      current
     DESCRIPTION
        "A collection of objects representing a SYSLOG message,
         excluding structured data elements."
     ::= { syslogMsgGroups 2 }

 syslogMsgSDGroup OBJECT-GROUP
     OBJECTS {
         -- syslogMsgSDParamIndex,
         -- syslogMsgSDID,
         -- syslogMsgSDParamName,
         syslogMsgSDParamValue
     }
     STATUS      current
     DESCRIPTION
        "A collection of objects representing the structured data
         elements of a SYSLOG message."
     ::= { syslogMsgGroups 3 }

 syslogMsgControlGroup OBJECT-GROUP
     OBJECTS {
         syslogMsgTableMaxSize,
         syslogMsgEnableNotifications

     }
     STATUS      current
     DESCRIPTION
        "A collection of control objects to control the size of the
         syslogMsgTable and to enable/disable notifications."
     ::= { syslogMsgGroups 4 }

 END

8.  Usage Example

   The following example shows a valid SYSLOG message including
   structured data.  The otherwise-unprintable Unicode byte order mark
   (BOM) is represented as "BOM" in the example.

    <165>1 2003-10-11T22:14:15.003Z mymachine.example.com
    evntslog - ID47 [exampleSDID@32473 iut="3" eventSource="Application"
    eventID="1011"] BOMAn application event log entry...

   This SYSLOG message leads to the following entries in the
   syslogMsgTable and the syslogMsgSDTable (note that string indexes are
   written as strings for readability reasons):

     syslogMsgIndex.1 = 1
     syslogMsgFacility.1 = 20
     syslogMsgSeverity.1 = 5
     syslogMsgVersion.1 = 1
     syslogMsgTimeStamp.1 = 2003-10-11,22:14:15.003,+0:0
     syslogMsgHostName.1 = "mymachine.example.com"
     syslogMsgAppName.1 = "evntslog"
     syslogMsgProcID.1 = "-"
     syslogMsgMsgID.1 = "ID47"
     syslogMsgMsg.1 = "BOMAn application event log entry..."
     syslogMsgSDParamValue.1.1."exampleSDID@32473"."iut"
         = "3"
     syslogMsgSDParamValue.1.2."exampleSDID@32473"."eventSource"
         = "Application"
     syslogMsgSDParamValue.1.3."exampleSDID@32473"."eventID"
         = "1011"

9.  IANA Considerations

   The IANA has assigned value "192" under the 'mib-2' subtree and
   recorded the assignment in the SMI Numbers registry.

10.  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  syslogMsgTableMaxSize: This object controls how many entries are
      kept in the syslogMsgTable.  Unauthorized modifications may either
      cause increased memory consumption (by setting this object to a
      large value) or turn off the capability to retrieve notifications
      using GET class operations (by setting this object to zero).  This
      might be used to hide traces of an attack.

   o  syslogMsgEnableNotifications: This object enables notifications.
      Unauthorized modifications to disable notification generation can
      be used to hide an attack by preventing management applications
      that use SNMP from receiving real-time notifications about events
      carried in SYSLOG messages.  Unauthorized modifications to enable
      notification generation may be used as part of a denial-of-service
      attack against a network management system if, for example, the
      SYSLOG-to-SNMP translator accepts unauthorized SYSLOG messages.

   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  syslogMsgTableMaxSize, syslogMsgEnableNotifications: These objects
      provide information regarding whether SYSLOG messages are
      forwarded as SNMP notifications and how many messages will be
      maintained in the syslogMsgTable.  This information might be
      exploited by an attacker in order to plan actions with the goal of
      hiding attack activities.

   o  syslogMsgFacility, syslogMsgSeverity, syslogMsgVersion,
      syslogMsgTimeStamp, syslogMsgHostName, syslogMsgAppName,
      syslogMsgProcID, syslogMsgMsgID, syslogMsgSDParams, syslogMsgMsg,
      syslogMsgSDParamValue: These objects carry the content of SYSLOG
      messages and the SYSLOG-message-oriented security considerations
      of [RFC5424] apply.  In particular, an attacker who gains access
      to SYSLOG messages via SNMP may use the knowledge gained from

      SYSLOG messages to compromise a machine or do other damage.  It is
      therefore desirable to configure SNMP access control rules,
      enforcing a consistent security policy for SYSLOG messages.

   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.

   Using the security features of the SNMPv3 framework secures the
   transport of SYSLOG data via SNMP only.  It is therefore RECOMMENDED
   that deployments use SYSLOG security mechanisms in order to prevent
   attackers from adding malicious SYSLOG data to the MIB tables.

11.  Acknowledgments

   The editors wish to thank the following individuals for providing
   helpful comments on various versions of this document: Martin
   Bjorklund, Washam Fan, Rainer Gerhards, Wes Hardacker, David
   Harrington, Tom Petch, Juergen Quittek, Dan Romascanu, and Bert
   Wijnen.

12.  References

12.1.  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)",
              RFC 2578, STD 58, April 1999.

   [RFC2579]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
              "Textual Conventions for SMIv2", RFC 2579, STD 58,
              April 1999.

   [RFC2580]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
              "Conformance Statements for SMIv2", RFC 2580, STD 58,
              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.

   [RFC3412]  Case, J., Harrington, D., Presuhn, R., and B. Wijnen,
              "Message Processing and Dispatching for the Simple Network
              Management Protocol (SNMP)", STD 62, RFC 3412,
              December 2002.

   [RFC3629]  Yergeau, F., "UTF-8, a transformation format of ISO
              10646", STD 63, RFC 3629, November 2003.

   [RFC5424]  Gerhards, R., "The Syslog Protocol", RFC 5424, March 2009.

   [RFC5427]  Keeni, G., "Textual Conventions for Syslog Management",
              RFC 5427, March 2009.

   [RFC5675]  Marinov, V. and J. Schoenwaelder, "Mapping Simple Network
              Management Protocol (SNMP) Notifications to SYSLOG
              Messages", RFC 5675, October 2009.

12.2.  Informative References

   [RFC3014]  Kavasseri, R., Ed., "Notification Log MIB", RFC 3014,
              November 2002.

   [RFC3410]  Case, J., Mundy, R., Partain, D., and B. Stewart,
              "Introduction and Applicability Statements for Internet-
              Standard Management Framework", RFC 3410, December 2002.

Authors' Addresses

   Juergen Schoenwaelder
   Jacobs University Bremen
   Campus Ring 1
   28725 Bremen
   Germany

   EMail: j.schoenwaelder@jacobs-university.de

   Alexander Clemm
   Cisco Systems
   170 West Tasman Drive
   San Jose, CA 95134-1706
   USA

   EMail: alex@cisco.com

   Anirban Karmakar
   Cisco Systems India Pvt Ltd
   SEZ Unit, Cessna Business Park,
   Sarjapur Marathahalli ORR,
   Bangalore, Karnataka 560103
   India

   EMail: akarmaka@cisco.com

 

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