Network Working Group J. Schoenwaelder
Internet-Draft Jacobs University Bremen
Intended status: Standards Track A. Clemm
Expires: September 10, 2009 A. Karmakar
Cisco Systems
March 9, 2009
Definitions of Managed Objects for Mapping SYSLOG Messages to Simple
Network Management Protocol (SNMP) Notifications
draft-ietf-opsawg-syslog-msg-mib-02.txt
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document authors. All rights reserved.
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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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. The Internet-Standard Management Framework . . . . . . . . . . 3
3. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5. Relationship to Other MIB Modules . . . . . . . . . . . . . . 5
6. Relationship to SYSLOG to SNMP Mappings . . . . . . . . . . . 5
7. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . 6
8. Usage Example . . . . . . . . . . . . . . . . . . . . . . . . 18
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19
10. Security Considerations . . . . . . . . . . . . . . . . . . . 19
11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 20
12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 21
12.1. Normative References . . . . . . . . . . . . . . . . . . 21
12.2. Informative References . . . . . . . . . . . . . . . . . 21
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 22
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1. Introduction
SNMP [RFC3410] [RFC3411] and SYSLOG [I-D.ietf-syslog-protocol] 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 are 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 converted by a SYSLOG to SNMP converter. Such a
converter acts as a SYSLOG receiver [I-D.ietf-syslog-protocol] and
implements a MIB module according to the SNMP architecture [RFC3411].
The converter might be tightly coupled to an SNMP agent or it might
interface with an SNMP agent via a subagent protocol.
After initialization, the converter will listen for SYSLOG messages.
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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 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 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)
+-- OctetString syslogMsgMsg(10)
+-- Bits syslogMsgFlags(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 is 1:0..*.
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--syslogMsgObjects(1)
|
+--syslogMsgSDTable(3)
|
+--syslogMsgSDEntry(1) [syslogMsgIndex,
| syslogMsgSDParamIndex
| syslogMsgSDID,
| syslogMsgSDParamName]
|
+-- Unsigned32 syslogMsgSDParamIndex(1)
+-- DisplayString syslogMsgSDID(2)
+-- DisplayString syslogMsgSDParamName(3)
+-- SnmpAdminString 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 following MIB module IMPORTS objects from SNMPv2-SMI [RFC2578],
SNMPv2-TC [RFC2579], SNMPv2-CONF [RFC2580], SNMP-FRAMEWORK-MIB
[RFC3411], and SYSLOG-TC-MIB [I-D.ietf-syslog-tc-mib].
6. Relationship to SYSLOG to SNMP Mappings
A companion document defines a mapping of SNMP notifications to
SYSLOG messages [I-D.ietf-opsawg-syslog-snmp]. This section
discusses the possibilities of using both specifications in
combination to create notification "tunnels".
A SYSLOG receiver 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
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"tunneled" through SYSLOG messages.
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.
While the SYSLOG-MSG-MIB provides a definition of an SNMP
notification to carry essential parts of a SYSLOG message, it is
important to realize that it is not required to include all
structured data elements (SD-IDs) of a SYSLOG message in this
notification due to SNMP message size limitations. As a consequence,
an SNMP management application should use trap-directed polling to
determine whether a received SNMP notification did include all SD-IDs
of a SYSLOG message. Regular polling of the SYSLOG-MSG-MIB also
takes 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
SnmpAdminString
FROM SNMP-FRAMEWORK-MIB
SyslogFacility, SyslogSeverity
FROM SYSLOG-TC-MIB;
syslogMsgMib MODULE-IDENTITY
LAST-UPDATED "200903090800Z"
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>
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Cisco Systems
170 West Tasman Drive
San Jose, CA 95134-1706
USA
Anirban Karmakar
<akarmaka@cisco.com>
Cisco Systems
170 West Tasman Drive
San Jose, CA 95134-1706
USA"
DESCRIPTION
"This MIB module represent SYSLOG messages as SNMP objects.
Copyright (c) 2009 IETF Trust and the persons identified as
the document authors. All rights reserved. This version of
this MIB module is part of RFC XXXX; see the RFC itself for
full legal notices."
REVISION "200902200800Z"
DESCRIPTION
"Initial version issued as part of RFC XXXX."
-- RFC Ed.: replace XXXX with actual RFC number & remove this note
::= { mib-2 XXX }
-- RFC Ed.: replace XXX with IANA-assigned number & remove this note
-- 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 that
the subsecond granulation is microseconds instead of
deciseconds and that 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 '+' / '-'
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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))
-- 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 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
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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,
syslogMsgMsg OCTET STRING,
syslogMsgFlags BITS
}
syslogMsgIndex OBJECT-TYPE
SYNTAX Unsigned32 (1..4294967295)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
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"A monotonically increasing number used to identify entries in
the syslogMsgTable. When syslogMsgIndex reaches the maximum
value the value wraps back to 1."
::= { syslogMsgEntry 1 }
syslogMsgFacility OBJECT-TYPE
SYNTAX SyslogFacility
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The facility of the syslog message."
REFERENCE
"RFCYYYY: The syslog Protocol (section 6.2.1)
RFCZZZZ: Textual Conventions for Syslog Management"
-- RFC Ed.: replace YYYY with SYSLOG RFC number & remove this note
-- RFC Ed.: replace ZZZZ with SYSLOG TC RFC number, remove this note
::= { syslogMsgEntry 2 }
syslogMsgSeverity OBJECT-TYPE
SYNTAX SyslogSeverity
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The severity of the syslog message"
REFERENCE
"RFCYYYY: The syslog Protocol (section 6.2.1)
RFCZZZZ: Textual Conventions for Syslog Management"
-- RFC Ed.: replace YYYY with SYSLOG RFC number & remove this note
-- RFC Ed.: replace ZZZZ with SYSLOG TC RFC number, remove this note
::= { 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
"RFCYYYY: The syslog Protocol (section 6.2.2)"
-- RFC Ed.: replace YYYY with SYSLOG RFC number & remove this note
::= { syslogMsgEntry 4 }
syslogMsgTimeStamp OBJECT-TYPE
SYNTAX SyslogTimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
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"The timestamp of the syslog message. A zero length
string is returned if the timestamp is unknown."
REFERENCE
"RFCYYYY: The syslog Protocol (section 6.2.3)"
-- RFC Ed.: replace YYYY with SYSLOG RFC number & remove this note
::= { syslogMsgEntry 5 }
syslogMsgHostName OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The host name of the syslog message. A zero-length string
indicates an unknown host name. The SYSLOG protocol
specification constraints this string to printable US-ASCII
code points."
REFERENCE
"RFCYYYY: The syslog Protocol (section 6.2.4)"
-- RFC Ed.: replace YYYY with SYSLOG RFC number & remove this note
::= { 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 constraints this string to printable US-ASCII
code points."
REFERENCE
"RFCYYYY: The syslog Protocol (section 6.2.5)"
-- RFC Ed.: replace YYYY with SYSLOG RFC number & remove this note
::= { 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
constraints this string to printable US-ASCII code points."
REFERENCE
"RFCYYYY: The syslog Protocol (section 6.2.6)"
-- RFC Ed.: replace YYYY with SYSLOG RFC number & remove this note
::= { syslogMsgEntry 8 }
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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
constraints this string to printable US-ASCII code points."
REFERENCE
"RFCYYYY: The syslog Protocol (section 6.2.7)"
-- RFC Ed.: replace YYYY with SYSLOG RFC number & remove this note
::= { syslogMsgEntry 9 }
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. If the message has been truncated
by the SYSLOG to SNMP converter, the truncated bit in the
syslogMsgFlags must be set to 1.
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
"RFCYYYY: The syslog Protocol (section 6.4)"
-- RFC Ed.: replace YYYY with SYSLOG RFC number & remove this note
::= { syslogMsgEntry 10 }
syslogMsgFlags OBJECT-TYPE
SYNTAX BITS { truncated(0), sdparams(1) }
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The bits contained in this object convey meta information
about the syslog message. The meaning of the bits is as
follows:
truncated - This bit is set if the converter had to
truncate the syslogMsgMsg to comply with
implementation and/or SNMP message size
constraints.
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sdparams - This bit is set if the syslog messages
contained structured data element parameters
and serves as an indicator whether there is
data in the syslogMsgSDTable for this syslog
message.
For syslog messages without structured data element parameters
that were not truncated by the converter, none of the bits is
set."
::= { 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 SnmpAdminString
}
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
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position of a structured data element parameter in a
SYSLOG message."
REFERENCE
"RFCYYYY: 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 constraints this string to printable
US-ASCII code points."
REFERENCE
"RFCYYYY: 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 constraints this string to
printable US-ASCII code points."
REFERENCE
"RFCYYYY: The syslog Protocol (section 6.3.3)"
::= { syslogMsgSDEntry 3 }
syslogMsgSDParamValue OBJECT-TYPE
SYNTAX SnmpAdminString
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
"RFCYYYY: The syslog Protocol (section 6.3.3)"
::= { syslogMsgSDEntry 4 }
-- notification definitions
syslogMsgNotification NOTIFICATION-TYPE
OBJECTS { syslogMsgFacility, syslogMsgSeverity,
syslogMsgVersion, syslogMsgTimeStamp,
syslogMsgHostName, syslogMsgAppName,
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syslogMsgProcID, syslogMsgMsgID,
syslogMsgMsg, syslogMsgFlags }
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
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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 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
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"Read access is not required."
OBJECT syslogMsgMsgID
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 syslogMsgFlags
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,
syslogMsgMsg,
syslogMsgFlags
}
STATUS current
DESCRIPTION
"A collection of objects representing a syslog message
excluding structured data elements."
::= { syslogMsgGroups 2 }
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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 BOM is
represented as "BOM" in the example.
<165>1 2003-10-11T22:14:15.003Z mymachine.example.com
evntslog - ID47 [exampleSDID@0 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):
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syslogMsgIndex.1 = 1
syslogMsgFacility.1 = 20
syslogMsgSeverity.1 = 5
syslogMsgVersion.1 = 1
syslogMsgTimeStamp.1 = 2003-10-11 22:14:15.003+00:00
syslogMsgHostName.1 = "mymachine.example.com"
syslogMsgAppName.1 = "evntslog"
syslogMsgProcID.1 = "-"
syslogMsgMsgID.1 = "ID47"
syslogMsgMsg.1 = "BOMAn application event log entry..."
syslogMsgSDParamValue.1.1."exampleSDID@0"."iut"
= "3"
syslogMsgSDParamValue.1.2."exampleSDID@0"."eventSource"
= "Application"
syslogMsgSDParamValue.1.3."exampleSDID@0"."eventID"
= "1011"
9. IANA Considerations
The IANA is requested to assign a value for "XXX" under the 'mib-2'
subtree and to record the assignment in the SMI Numbers registry.
When the assignment has been made, the RFC Editor is asked to replace
"XXX" (here and in the MIB module) with the assigned value.
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. 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 converter accepts unauthorized syslog messages.
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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 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, syslogMsgMsg, syslogMsgFlags,
syslogMsgSDParamValue: These objects carry the content of syslog
messags and the syslog message oriented security considerations of
[I-D.ietf-syslog-protocol] 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.
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.
11. Acknowledgments
The authors wish to thank Martin Bjorklund, Washam Fan, Rainer
Gerhards, Wes Hardacker, David Harrington, Tom Petch, Juergen
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Quittek, Bert Wijnen, and all other people who commented on various
versions of this document.
12. References
12.1. Normative References
[I-D.ietf-opsawg-syslog-snmp]
Marinov, V. and J. Schoenwaelder, "Mapping Simple Network
Management Protocol (SNMP) Notifications to SYSLOG
Messages", Internet Draft (work in progress), March 2009.
[I-D.ietf-syslog-protocol]
Gerhards, R., "The syslog Protocol", Internet Draft (work
in progress), September 2007.
[I-D.ietf-syslog-tc-mib]
Keeni, G., "Textual Conventions for Syslog Management",
Internet Draft (work in progress), May 2008.
[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.
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-
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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
170 West Tasman Drive
San Jose, CA 95134-1706
USA
Email: akarmaka@cisco.com
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