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.\" $FreeBSD: release/9.1.0/contrib/bsnmp/snmp_usm/snmp_usm.3 235575 2012-05-18 00:31:20Z gjb $
.\"
.Dd September 9, 2010
.Dt SNMP_USM 3
.Os
.Sh NAME
.Nm snmp_usm
.Nd "user-based security module for
.Xr bsnmpd 1
.Sh LIBRARY
.Pq begemotSnmpdModulePath."usm" = "/usr/lib/snmp_usm.so"
.Sh DESCRIPTION
The
.Nm snmp_usm
module implements SNMPv3 User-Based Security Model MIB as defined in RFC 3414.
The module is used to manage the internal list of SNMPv3 USM active users in
.Nm bsnmpd .
The module must be loaded for
.Nm bsnmpd
to receive and process SNMPv3 USM PDUs correctly.
.Sh IMPLEMENTATION NOTES
A short description of the objects in the MIB follows.
.Bl -tag -width "XXXXXXXXX"
.It Va usmStats
The subtree contains statistics for the User-based Security Model PDU processing.
The statistics are reset each time the module is loaded.
.It Va usmUserSpinLock
An advisory lock used to coordinate several Command Generator Applications when
altering the SNMP USM users.
.It Va usmUserTable
The table contains all SNMP USM users configured in
.Nm bsnmpd .
The table contains the following objects
.Bl -tag -width ".It Va usmUserEngineID"
.It Va usmUserEngineID
An SNMP engine's administratively-unique identifier. Must be set to the same
Engine ID as
.Nm bsnmpd
so that the user will actually be allowed to communicate with the daemon.
The column is used as entry key and is not accessible for GET or SET operations.
.It Va usmUserName
The USM user name. The second entry key, again not accessible for GET or SET
operations.
.It Va usmUserSecurityName
The column has the exact same value as the
.Va usmUserName
column, however is accessible for GET operations.
.It Va usmUserCloneFrom
A GET on this column will return an empty OID. SET operations are currently not
supported.
.It Va usmUserAuthProtocol
The value of this column contains the OID corresponding to the authentication
protocol used by the USM user. The following protocols and their OIDs are known to
.Nm 
module
.Bl -tag -width ".It Va NoAuthProtocol"
.It NoAuthProtocol 1.3.6.1.6.3.10.1.1.1
.It HMACMD5AuthProtocol 1.3.6.1.6.3.10.1.1.2
.It HMACSHAAuthProtocol 1.3.6.1.6.3.10.1.1.3
.El
.It Va usmUserAuthKeyChange , Va usmUserOwnAuthKeyChange
These columns may be used to change the user's authentication key.
.It Va usmUserPrivProtocol
The value of this column contains the OID corresponding to the privacy
protocol used by the USM user. The following protocols and their OIDs are known to
.Nm 
module
.Bl -tag -width ".It Va NoPrivProtocol"
.It NoPrivProtocol 1.3.6.1.6.3.10.1.2.1
.It DESPrivProtoco 1.3.6.1.6.3.10.1.2.2
.It AesCfb128Protocol 1.3.6.1.6.3.10.1.2.4
.El
.It Va usmUserPrivKeyChange , Va usmUserOwnPrivKeyChange
These columns may be used to change the user's privacy key.
.It Va usmUserPublic
An arbitrary octet string that may be modified to confirm a SET operation on any
of the columns was successful.
.It Va usmUserStorageType
This column always has either of two values. Entries created via
.Nm bsnmpd's
configuration file always have this column set to readOnly (5) and
it is not possible to modify those entries. Entries created by Command Generator
Applications always have this column set to volatile(2) and such entries are
lost when the module is restarted. A SET operation on this column is not
allowed.
.It Va usmUserStatus
This column is used to create new USM user entries or delete existing ones from
the table.
.El
.El
.Sh FILES
.Bl -tag -width "XXXXXXXXX"
.It Pa /usr/share/snmp/defs/usm_tree.def
The description of the MIB tree implemented by
.Nm .
.El
.Sh SEE ALSO
.Xr bsnmpd 1 ,
.Xr gensnmptree 1 ,
.Xr snmpmod 3
.Sh STANDARDS
IETF RFC 3414
.Sh AUTHORS
.An Shteryana Shopova Aq syrinx@FreeBSD.org

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