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           The  Access  Logging  overlay  can  be used to record all accesses to a
           given backend database on another database.  This  allows  all  of  the
           activity  on  a  given  database  to  be  reviewed using arbitrary LDAP
           queries, instead of just logging to local flat text  files.  Configura-
           tion options are available for selecting a subset of operation types to
           log, and to automatically prune older  log  records  from  the  logging
           database.   Log  records  are  stored  with audit schema (see below) to
           assure their readability whether viewed as LDIF or in raw form.


           These slapd.conf options apply to the  Access  Logging  overlay.   They
           should appear after the overlay directive.
           logdb <suffix>
                  Specify  the suffix of a database to be used for storing the log
                  records.  The specified database must be  defined  elsewhere  in
                  the  configuration.   The  access  controls  on the log database
                  should prevent general access.  The  suffix  entry  of  the  log
                  database  will be created automatically by this overlay. The log
                  entries will be generated as the immediate children of the  suf-
                  fix entry.
           logops <operations>
                  Specify  which  types  of operations to log. The valid operation
                  types are abandon, add, bind, compare, delete, extended, modify,
                  modrdn,  search,  and  unbind. Aliases for common sets of opera-
                  tions are also available:
                  writes add, delete, modify, modrdn
                  reads  compare, search
                         abandon, bind, unbind
                  all    all operations
           logbase <operations> <baseDN>
                  Specify a set of operations that will only  be  logged  if  they
                  occur  under  a  specific subtree of the database. The operation
                  types are as above for the logops setting, and  delimited  by  a
                  '|' character.
           logold <filter>
                  Specify  a  filter  for  matching  against  Deleted and Modified
                  entries. If the entry matches the filter, the  old  contents  of
                  the entry will be logged along with the current request.
                         logpurge 2+00:00 1+00:00
                  would specify that the log database should be scanned every  day
                  for  old  entries,  and  entries  older  than two days should be
                  deleted. When using a log database that supports ordered  index-
                  ing on generalizedTime attributes, specifying an eq index on the
                  reqStart attribute will greatly benefit the performance  of  the
                  purge operation.
           logsuccess TRUE | FALSE
                  If  set to TRUE then log records will only be generated for suc-
                  cessful requests, i.e., requests that produce a result code of 0
                  (LDAP_SUCCESS).   If  FALSE,  log  records are generated for all
                  requests whether they succeed or not. The default is FALSE.


                database bdb
                suffix dc=example,dc=com
                overlay accesslog
                logdb cn=log
                logops writes reads
                logbase search|compare ou=testing,dc=example,dc=com
                logold (objectclass=person)
                database bdb
                suffix cn=log
                index reqStart eq
                access to *
                  by dn.base="cn=admin,dc=example,dc=com" read


           The accesslog overlay utilizes the  "audit"  schema  described  herein.
           This  schema is specifically designed for accesslog auditing and is not
           intended to be used otherwise.   It  is  also  noted  that  the  schema
           described here is a work in progress, and hence subject to change with-
           out notice.  The schema is loaded automatically by the overlay.
           The schema includes a number of object classes and associated attribute
           types as described below.
           There  is  a basic auditObject class from which two additional classes,
           auditReadObject and auditWriteObject are derived.  Object  classes  for
           each  type  of  LDAP  operation are further derived from these classes.
           This object class hierarchy is designed to allow flexible yet efficient
           searches  of the log based on either a specific operation type's class,
           or on more general classifications. The definition of  the  auditObject
           class is as follows:
           each log entry.
           The reqType attribute is a simple string containing the type of  opera-
           tion  being logged, e.g.  add, delete, search, etc. For extended opera-
           tions, the type also includes the OID of the extended  operation,  e.g.
           The  reqSession attribute is an implementation-specific identifier that
           is common to all the operations associated with the same LDAP  session.
           Currently this is slapd's internal connection ID, stored in decimal.
           The reqDN attribute is the distinguishedName of the target of the oper-
           ation. E.g., for a Bind request, this  is  the  Bind  DN.  For  an  Add
           request, this is the DN of the entry being added. For a Search request,
           this is the base DN of the search.
           The reqAuthzID attribute is the distinguishedName of the user that per-
           formed the operation.  This will usually be the same name as was estab-
           lished at the start of a session by a Bind request (if any) but may  be
           altered in various circumstances.
           The  reqControls and reqRespControls attributes carry any controls sent
           by the client on  the  request  and  returned  by  the  server  in  the
           response,  respectively.  The  attribute  values are just uninterpreted
           octet strings.
           The reqResult attribute is the numeric LDAP result code of  the  opera-
           tion,  indicating  either  success  or a particular LDAP error code. An
           error code may be accompanied by a text error  message  which  will  be
           recorded in the reqMessage attribute.
           The reqReferral attribute carries any referrals that were returned with
           the result of the request.
           Operation-specific classes are defined with  additional  attributes  to
           carry all of the relevant parameters associated with the operation:
                   NAME 'auditAbandon'
                   DESC 'Abandon operation'
                   SUP auditObject STRUCTURAL
                   MUST reqId )
           For  the  Abandon operation the reqId attribute contains the message ID
           of the request that was abandoned.
                   NAME 'auditAdd'
                   DESC 'Add operation'
                   SUP auditWriteObject STRUCTURAL
                   NAME 'auditBind'
                   DESC 'Bind operation'
                   SUP auditObject STRUCTURAL
                   MUST ( reqVersion $ reqMethod ) )
           The Bind class includes the reqVersion  attribute  which  contains  the
           LDAP  protocol  version  specified in the Bind as well as the reqMethod
           attribute which contains the Bind Method used in the Bind. This will be
           the string SIMPLE for LDAP Simple Binds or SASL(<mech>) for SASL Binds.
           Note that unless configured as a  global  overlay,  only  Simple  Binds
           using DNs that reside in the current database will be logged.
                   NAME 'auditCompare'
                   DESC 'Compare operation'
                   SUP auditObject STRUCTURAL
                   MUST reqAssertion )
           For  the  Compare  operation  the  reqAssertion  attribute  carries the
           Attribute Value Assertion used in the compare request.
                   NAME 'auditDelete'
                   DESC 'Delete operation'
                   SUP auditWriteObject STRUCTURAL
                   MAY reqOld )
           The Delete operation needs no further parameters. However,  the  reqOld
           attribute  may  optionally  be used to record the contents of the entry
           prior to its deletion. The values are formatted as
                  attribute: value
           The reqOld attribute is only  populated  if  the  entry  being  deleted
           matches the configured logold filter.
                   NAME 'auditModify'
                   DESC 'Modify operation'
                   SUP auditWriteObject STRUCTURAL
                   MAY reqOld MUST reqMod )
           The  Modify  operation  contains  a description of modifications in the
           reqMod attribute, which was already described above in the  Add  opera-
           tion.  It  may optionally contain the previous contents of any modified
           attributes in the reqOld attribute, using the same format as  described
           above for the Delete operation.  The reqOld attribute is only populated
           if the entry being modified matches the configured logold filter.
                   NAME 'auditSearch'
                   DESC 'Search operation'
                   SUP auditReadObject STRUCTURAL
                   MUST ( reqScope $ reqDerefAliases $ reqAttrsOnly )
                   MAY ( reqFilter $ reqAttr $ reqEntries $ reqSizeLimit $
                         reqTimeLimit ) )
           For  the  Search class the reqScope attribute contains the scope of the
           original search request, using the values specified for  the  LDAP  URL
           format. I.e.  base, one, sub, or subord.  The reqDerefAliases attribute
           is one of never, finding, searching, or always,  denoting  how  aliases
           will  be  processed during the search.  The reqAttrsOnly attribute is a
           Boolean value showing TRUE if only attribute names were  requested,  or
           FALSE  if  attributes  and  their values were requested.  The reqFilter
           attribute carries the filter used in the search request.   The  reqAttr
           attribute  lists  the  requested attributes if specific attributes were
           requested.  The reqEntries attribute is the integer count of  how  many
           entries  were  returned  by  this search request.  The reqSizeLimit and
           reqTimeLimit attributes indicate what  limits  were  requested  on  the
           search operation.
                   NAME 'auditExtended'
                   DESC 'Extended operation'
                   SUP auditObject STRUCTURAL
                   MAY reqData )
           The  Extended  class  represents  an  LDAP Extended Operation. As noted
           above, the actual OID of the  operation  is  included  in  the  reqType
           attribute  of  the parent class. If any optional data was provided with
           the request, it will be contained in the reqData attribute as an  unin-
           terpreted octet string.


           The Access Log implemented by this overlay may be used for a variety of
           other tasks, e.g. as a ChangeLog for a replication mechanism,  as  well
           as for security/audit logging purposes.


                  default slapd configuration file


           slapd.conf(5), slapd-config(5).

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