Provided by: slapd_2.4.11-0ubuntu6_i386 bug


       slapd-config - configuration backend to slapd




       The config backend manages all of the configuration information for the
       slapd(8) daemon.  This configuration information is also  used  by  the
       SLAPD tools slapacl(8), slapadd(8), slapauth(8), slapcat(8), slapdn(8),
       slapindex(8), and slaptest(8).

       The config backend is backward compatible with the older  slapd.conf(5)
       file  but  provides the ability to change the configuration dynamically
       at runtime. If slapd is run with only a slapd.conf file dynamic changes
       will  be  allowed  but  they  will not persist across a server restart.
       Dynamic changes are only saved when slapd is  running  from  a  slapd.d
       configuration directory.

       Unlike  other  backends,  there  can only be one instance of the config
       backend, and most of its structure  is  predefined.  The  root  of  the
       database  is hardcoded to cn=config and this root entry contains global
       settings for slapd. Multiple child entries underneath  the  root  entry
       are used to carry various other settings:

                     dynamically loaded modules

                     schema definitions

                     backend-specific settings

                     database-specific settings

       The  cn=Module  entries  will only appear in configurations where slapd
       was built with support for dynamically loaded  modules.  There  can  be
       multiple  entries,  one  for  each  configured module path. Within each
       entry there will be values recorded for each module loaded on  a  given
       path. These entries have no children.

       The cn=Schema entry contains all of the hardcoded schema elements.  The
       children of this entry contain all user-defined  schema  elements.   In
       schema  that  were  loaded  from include files, the child entry will be
       named after  the  include  file  from  which  the  schema  was  loaded.
       Typically    the    first    child    in    this    subtree   will   be

       olcBackend entries are  for  storing  settings  specific  to  a  single
       backend  type (and thus global to all database instances of that type).
       At present there are  no  backends  that  implement  settings  of  this
       nature, so usually there will not be any olcBackend entries.

       olcDatabase  entries  store  settings  specific  to  a  single database
       instance. These entries may have olcOverlay child entries corresponding
       to  any  overlays  configured  on  the  database.  The  olcDatabase and
       olcOverlay entries may also have miscellaneous child entries for  other
       settings  as  needed.  There  are two special database entries that are
       predefined - one is an entry for the config database  itself,  and  the
       other is for the "frontend" database. Settings in the frontend database
       are inherited by  the  other  databases,  unless  they  are  explicitly
       overridden in a specific database.

       The specific configuration options available are discussed below in the
       Global Configuration Options,  General  Backend  Options,  and  General
       Database  Options.  Options  are  set  by defining LDAP attributes with
       specific values.  In general the names of the LDAP attributes  are  the
       same  as  the  corresponding  slapd.conf  keyword, with an "olc" prefix
       added on.

       The parser for many of these attributes is the same as used for parsing
       the  slapd.conf  keywords.  As  such,  slapd.conf  keywords  that allow
       multiple items to be specified on one line,  separated  by  whitespace,
       will  allow  multiple  items  to  be  specified in one attribute value.
       However, when reading  the  attribute  via  LDAP,  the  items  will  be
       returned as individual attribute values.

       Backend-specific options are discussed in the slapd-<backend>(5) manual
       pages.  Refer to the "OpenLDAP Administrator’s Guide" for more  details
       on configuring slapd.


       Options  described  in  this  section  apply  to the server as a whole.
       Arguments that should be replaced by actual text are shown in  brackets

       These  options may only be specified in the cn=config entry. This entry
       must have an objectClass of olcGlobal.

       olcAllows: <features>
              Specify a set of features  to  allow  (default  none).   bind_v2
              allows  acceptance  of LDAPv2 bind requests.  Note that slapd(8)
              does not truly implement LDAPv2 (RFC 1777),  now  Historic  (RFC
              3494).   bind_anon_cred  allows  anonymous bind when credentials
              are not empty (e.g.  when DN  is  empty).   bind_anon_dn  allows
              unauthenticated   (anonymous)   bind   when  DN  is  not  empty.
              update_anon allows unauthenticated (anonymous) update operations
              to   be   processed   (subject  to  access  controls  and  other
              administrative limits).  proxy_authz_anon allows unauthenticated
              (anonymous) proxy authorization control to be processed (subject
              to  access  controls,  authorization  and  other  administrative

       olcArgsFile: <filename>
              The  (  absolute  )  name  of  a  file  that will hold the slapd
              server’s command line options if started without  the  debugging
              command line option.

       olcAttributeOptions: <option-name>...
              Define  tagging  attribute options or option tag/range prefixes.
              Options must not end with ‘-’, prefixes must end with ‘-’.   The
              ‘lang-’    prefix    is    predefined.     If    you   use   the
              olcAttributeOptions directive, ‘lang-’ will no longer be defined
              and you must specify it explicitly if you want it defined.

              An  attribute  description with a tagging option is a subtype of
              that attribute description without the option.  Except for that,
              options  defined  this  way have no special semantics.  Prefixes
              defined this way work like the ‘lang-’ options:  They  define  a
              prefix  for  tagging options starting with the prefix.  That is,
              if you define the prefix ‘x-foo-’, you can use  the  option  ‘x-
              foo-bar’.   Furthermore,  in  a  search  or compare, a prefix or
              range name (with a trailing ‘-’) matches  all  options  starting
              with  that  name, as well as the option with the range name sans
              the trailing ‘-’.  That is, ‘x-foo-bar-’ matches ‘x-foo-bar’ and

              RFC  4520  reserves  options  beginning  with  ‘x-’  for private
              experiments.  Other options should be registered with IANA,  see
              RFC  4520  section  3.5.   OpenLDAP also has the ‘binary’ option
              built in, but this is a transfer option, not a tagging option.

       olcAuthzPolicy: <policy>
              Used to specify which rules  to  use  for  Proxy  Authorization.
              Proxy  authorization  allows  a  client  to  authenticate to the
              server using one user’s credentials,  but  specify  a  different
              identity  to  use for authorization and access control purposes.
              It essentially allows user A to login as user B, using user  A’s
              password.   The  none flag disables proxy authorization. This is
              the default setting.  The  from  flag  will  use  rules  in  the
              authzFrom  attribute  of the authorization DN.  The to flag will
              use rules in the authzTo attribute  of  the  authentication  DN.
              The  any  flag,  an alias for the deprecated value of both, will
              allow any of the above, whatever succeeds first (checked in  to,
              from  sequence.   The  all  flag requires both authorizations to

              The rules are mechanisms to specify which identities are allowed
              to  perform  proxy authorization.  The authzFrom attribute in an
              entry specifies which other users are allowed to proxy login  to
              this  entry.  The  authzTo attribute in an entry specifies which
              other users this user can authorize as.  Use  of  authzTo  rules
              can  be  easily  abused  if users are allowed to write arbitrary
              values to this attribute.  In general the authzTo attribute must
              be  protected  with  ACLs  such  that  only privileged users can
              modify it.  The value of  authzFrom  and  authzTo  describes  an
              identity or a set of identities; it can take five forms:



              The  first form is a valid LDAP URI where the <host>:<port>, the
              <attrs> and the <extensions> portions must be  absent,  so  that
              the  search  occurs locally on either authzFrom or authzTo.  The
              second form is a DN, with the optional  style  modifiers  exact,
              onelevel,  children,  and  subtree for exact, onelevel, children
              and subtree matches, which  cause  <pattern>  to  be  normalized
              according  to  the  DN normalization rules, or the special regex
              style, which causes the <pattern>  to  be  treated  as  a  POSIX
              (’’extended’’)  regular  expression,  as  discussed  in regex(7)
              and/or re_format(7).  A pattern of * means any non-anonymous DN.
              The third form is a SASL id, with the optional fields <mech> and
              <realm> that allow to specify a SASL mechanism, and eventually a
              SASL  realm, for those mechanisms that support one.  The need to
              allow the specification of a mechanism  is  still  debated,  and
              users are strongly discouraged to rely on this possibility.  The
              fourth form is a group specification, consisting of the  keyword
              group,  optionally  followed  by  the specification of the group
              objectClass  and  member  attributeType.   The  group  with   DN
              <pattern> is searched with base scope, and in case of match, the
              values of the member attributeType are searched for the asserted
              DN.   For  backwards  compatibility,  if  no  identity  type  is
              provided, i.e.  only  <pattern>  is  present,  an  exact  DN  is
              assumed;   as  a  consequence,  <pattern>  is  subjected  to  DN
              normalization.   Since  the  interpretation  of  authzFrom   and
              authzTo  can  impact  security, users are strongly encouraged to
              explicitly set the type of identity specification that is  being
              used.   A  subset of these rules can be used as third arg in the
              olcAuthzRegexp statement (see below); significantly, the URI and
              the dn.exact:<dn> forms.

       olcAuthzRegexp: <match> <replace>
              Used  by  the  authentication  framework  to convert simple user
              names, such as provided by SASL subsystem, to an  LDAP  DN  used
              for authorization purposes.  Note that the resultant DN need not
              refer to an existing entry to  be  considered  valid.   When  an
              authorization  request  is received from the SASL subsystem, the
              SASL USERNAME, REALM, and MECHANISM are taken,  when  available,
              and combined into a name of the form


              This   name   is   then   compared   against   the  match  POSIX
              (’’extended’’)  regular  expression,  and  if   the   match   is
              successful,  the  name  is replaced with the replace string.  If
              there are wildcard strings in the match regular expression  that
              are enclosed in parenthesis, e.g.


              then  the  portion of the name that matched the wildcard will be
              stored in the numbered placeholder variable  $1.  If  there  are
              other wildcard strings in parenthesis, the matching strings will
              be in $2, $3, etc. up to $9. The placeholders can then  be  used
              in the replace string, e.g.


              The  replaced name can be either a DN, i.e. a string prefixed by
              "dn:", or an LDAP URI.  If the latter, the server will  use  the
              URI  to  search  its  own database(s) and, if the search returns
              exactly one entry, the name is replaced by the DN of that entry.
              The  LDAP  URI  must  have  no  hostport,  attrs,  or extensions
              components, but the filter is mandatory, e.g.


              The protocol portion of the URI must  be  strictly  ldap.   Note
              that  this  search is subject to access controls.  Specifically,
              the authentication identity  must  have  "auth"  access  in  the

              Multiple  olcAuthzRegexp  values  can  be specified to allow for
              multiple  matching  and  replacement  patterns.   The   matching
              patterns  are checked in the order they appear in the attribute,
              stopping at the first successful match.

       olcConcurrency: <integer>
              Specify  a  desired  level  of  concurrency.   Provided  to  the
              underlying  thread  system  as  a  hint.   The default is not to
              provide any hint.  This  setting  is  only  meaningful  on  some
              platforms where there is not a one to one correspondence between
              user threads and kernel threads.

       olcConnMaxPending: <integer>
              Specify the maximum number of pending requests for an  anonymous
              session.   If  requests are submitted faster than the server can
              process them, they will be queued up to this limit. If the limit
              is exceeded, the session is closed. The default is 100.

       olcConnMaxPendingAuth: <integer>
              Specify   the   maximum   number  of  pending  requests  for  an
              authenticated session.  The default is 1000.

       olcDisallows: <features>
              Specify a set of features to disallow (default none).  bind_anon
              disables  acceptance of anonymous bind requests.  Note that this
              setting  does  not  prohibit  anonymous  directory  access  (See
              "require    authc").    bind_simple   disables   simple   (bind)
              authentication.   tls_2_anon   disables   forcing   session   to
              anonymous  status  (see  also tls_authc) upon StartTLS operation
              receipt.   tls_authc  disallows  the   StartTLS   operation   if
              authenticated (see also tls_2_anon).

       olcGentleHUP: { TRUE | FALSE }
              A  SIGHUP  signal  will  only cause a ’gentle’ shutdown-attempt:
              Slapd will stop listening for  new  connections,  but  will  not
              close  the  connections  to  the  current clients.  Future write
              operations   return   unwilling-to-perform,    though.     Slapd
              terminates  when  all  clients have closed their connections (if
              they ever do), or - as before - if it receives a SIGTERM signal.
              This can be useful if you wish to terminate the server and start
              a new slapd server with another database, without disrupting the
              currently  active  clients.  The default is FALSE.  You may wish
              to use olcIdleTimeout along with this option.

       olcIdleTimeout: <integer>
              Specify the number of seconds to wait before forcibly closing an
              idle  client  connection.  A setting of 0 disables this feature.
              The default is 0.

       olcIndexIntLen: <integer>
              Specify the key length for ordered  integer  indices.  The  most
              significant  bytes  of the binary integer will be used for index
              keys. The default value is 4, which provides exact indexing  for
              31 bit values.  A floating point representation is used to index
              too large values.

       olcIndexSubstrIfMaxlen: <integer>
              Specify the maximum length for subinitial and subfinal  indices.
              Only  this  many  characters  of  an  attribute  value  will  be
              processed by the indexing functions; any excess  characters  are
              ignored. The default is 4.

       olcIndexSubstrIfMinlen: <integer>
              Specify  the minimum length for subinitial and subfinal indices.
              An attribute value must have at least this  many  characters  in
              order  to be processed by the indexing functions. The default is

       olcIndexSubstrAnyLen: <integer>
              Specify the length used for subany indices. An  attribute  value
              must  have  at  least  this  many  characters  in  order  to  be
              processed. Attribute values longer  than  this  length  will  be
              processed  in  segments  of  this  length. The default is 4. The
              subany index will also be used in subinitial and subfinal  index
              lookups   when   the   filter   string   is   longer   than  the
              olcIndexSubstrIfMaxlen value.

       olcIndexSubstrAnyStep: <integer>
              Specify the steps used in subany index lookups. This value  sets
              the  offset  for  the  segments  of  a  filter  string  that are
              processed for a subany index  lookup.  The  default  is  2.  For
              example,  with  the  default  values, a search using this filter
              "cn=*abcdefgh*" would generate index lookups for "abcd", "cdef",
              and "efgh".

       Note:  Indexing support depends on the particular backend in use. Also,
       changing these settings will generally  require  deleting  any  indices
       that  depend on these parameters and recreating them with slapindex(8).

       olcLocalSSF: <SSF>
              Specifies the Security Strength Factor (SSF) to be  given  local
              LDAP  sessions,  such  as those to the ldapi:// listener.  For a
              description of SSF values, see olcSaslSecProps’s  minssf  option
              description.  The default is 71.

       olcLogFile: <filename>
              Specify  a  file  for  recording  debug log messages. By default
              these messages only go to stderr and are not  recorded  anywhere
              else.  Specifying  a  logfile copies messages to both stderr and
              the logfile.

       olcLogLevel: <integer> [...]
              Specify the level at which debugging  statements  and  operation
              statistics   should   be  syslogged  (currently  logged  to  the
              syslogd(8)  LOG_LOCAL4  facility).   They  must  be   considered
              subsystems  rather  than  increasingly verbose log levels.  Some
              messages with higher  priority  are  logged  regardless  of  the
              configured  loglevel  as soon as any logging is configured.  Log
              levels are additive, and available levels are:
                      1      (0x1 trace) trace function calls
                      2      (0x2 packets) debug packet handling
                      4      (0x4 args) heavy trace debugging (function args)
                      8      (0x8 conns) connection management
                      16     (0x10 BER) print out packets sent and received
                      32     (0x20 filter) search filter processing
                      64     (0x40 config) configuration file processing
                      128    (0x80 ACL) access control list processing
                      256    (0x100         stats)          stats          log
                      512    (0x200 stats2) stats log entries sent
                      1024   (0x400  shell)  print  communication  with  shell
                      2048   (0x800 parse) entry parsing

                      16384  (0x4000 sync) LDAPSync replication
                      32768  (0x8000  none)  only  messages  that  get  logged
                             whatever log level is set
              The  desired  log  level  can  be input as a single integer that
              combines the (ORed)  desired  levels,  both  in  decimal  or  in
              hexadecimal  notation,  as  a  list  of  integers (that are ORed
              internally), or as a list of the names that  are  shown  between
              brackets, such that

                  olcLogLevel: 129
                  olcLogLevel: 0x81
                  olcLogLevel: 128 1
                  olcLogLevel: 0x80 0x1
                  olcLogLevel: acl trace

              are  equivalent.   The  keyword any can be used as a shortcut to
              enable logging at all levels (equivalent to  -1).   The  keyword
              none,  or  the  equivalent  integer representation, causes those
              messages  that  are  logged   regardless   of   the   configured
              olcLogLevel  to  be  logged.  In fact, if no olcLogLevel (or a 0
              level) is defined, no logging occurs, so at least the none level
              is required to have high priority messages logged.

       olcPasswordCryptSaltFormat: <format>
              Specify   the  format  of  the  salt  passed  to  crypt(3)  when
              generating  {CRYPT}  passwords  (see   olcPasswordHash)   during
              processing  of  LDAP  Password  Modify  Extended Operations (RFC

              This string needs to be in sprintf(3) format and may include one
              (and   only   one)  %s  conversion.   This  conversion  will  be
              substituted  with   a   string   of   random   characters   from
              [A-Za-z0-9./].   For  example,  "%.2s"  provides a two character
              salt and "$1$%.8s" tells some versions of crypt(3) to use an MD5
              algorithm and provides 8 random characters of salt.  The default
              is "%s", which provides 31 characters of salt.

       olcPidFile: <filename>
              The ( absolute ) name  of  a  file  that  will  hold  the  slapd
              server’s  process  ID  (  see getpid(2) ) if started without the
              debugging command line option.

       olcPluginLogFile: <filename>
              The ( absolute ) name of a file that will contain  log  messages
              from SLAPI plugins. See slapd.plugin(5) for details.

       olcReferral: <url>
              Specify  the  referral  to pass back when slapd(8) cannot find a
              local database to handle a  request.   If  multiple  values  are
              specified, each url is provided.

       olcReverseLookup: TRUE | FALSE
              Enable/disable client name unverified reverse lookup (default is
              FALSE if compiled with --enable-rlookups).

       olcRootDSE: <file>
              Specify the name of an  LDIF(5)  file  containing  user  defined
              attributes  for  the root DSE.  These attributes are returned in
              addition to the attributes normally produced by slapd.

              The root DSE is an entry with information about the  server  and
              its  capabilities,  in operational attributes.  It has the empty
              DN, and can be read with e.g.:
                  ldapsearch -x -b "" -s base "+"
              See RFC 4512 section 5.1 for details.

       olcSaslHost: <fqdn>
              Used to specify the fully qualified domain name  used  for  SASL

       olcSaslRealm: <realm>
              Specify SASL realm.  Default is empty.

       olcSaslSecProps: <properties>
              Used  to  specify Cyrus SASL security properties.  The none flag
              (without  any  other  properties)  causes  the  flag  properties
              default, "noanonymous,noplain", to be cleared.  The noplain flag
              disables mechanisms susceptible to simple passive attacks.   The
              noactive flag disables mechanisms susceptible to active attacks.
              The nodict  flag  disables  mechanisms  susceptible  to  passive
              dictionary  attacks.   The  noanonymous flag disables mechanisms
              which support anonymous  login.   The  forwardsec  flag  require
              forward   secrecy   between   sessions.   The  passcred  require
              mechanisms which pass client credentials (and  allow  mechanisms
              which  can  pass  credentials  to  do  so).  The minssf=<factor>
              property specifies  the  minimum  acceptable  security  strength
              factor  as  an  integer approximate to effective key length used
              for encryption.  0  (zero)  implies  no  protection,  1  implies
              integrity  protection only, 56 allows DES or other weak ciphers,
              112 allows triple DES and other strong ciphers, 128 allows  RC4,
              Blowfish  and  other  modern  strong ciphers.  The default is 0.
              The maxssf=<factor> property specifies  the  maximum  acceptable
              security strength factor as an integer (see minssf description).
              The  default  is  INT_MAX.    The   maxbufsize=<size>   property
              specifies   the  maximum  security  layer  receive  buffer  size
              allowed.  0 disables security layers.  The default is 65536.

       olcServerID: <integer> [<URL>]
              Specify an integer ID from 0 to 4095 for this server. These  IDs
              are  required when using multimaster replication and each master
              must have a unique ID. Note that this requirement  also  applies
              to  separate  masters  contributing to a glued set of databases.
              If the URL is provided, this directive may be specified multiple
              times,  providing  a  complete list of participating servers and
              their IDs. The fully qualified hostname of each server should be
              used  in the supplied URLs. The IDs are used in the "replica id"
              field of all CSNs generated by the specified server. The default
              value is zero.  Example:

            olcServerID: 1 ldap://
            olcServerID: 2 ldap://

       olcSockbufMaxIncoming: <integer>
              Specify  the  maximum  incoming  LDAP  PDU  size  for  anonymous
              sessions.  The default is 262143.

       olcSockbufMaxIncomingAuth: <integer>
              Specify the maximum incoming LDAP  PDU  size  for  authenticated
              sessions.  The default is 4194303.

       olcThreads: <integer>
              Specify  the  maximum  size  of  the  primary  thread pool.  The
              default is 16; the minimum value is 2.

       olcToolThreads: <integer>
              Specify the maximum number of threads to use in tool mode.  This
              should  not  be  greater  than the number of CPUs in the system.
              The default is 1.


       If slapd is built with support for Transport Layer Security, there  are
       more options you can specify.

       olcTLSCipherSuite: <cipher-suite-spec>
              Permits  configuring  what  ciphers  will  be  accepted  and the
              preference  order.   <cipher-suite-spec>  should  be  a   cipher
              specification for OpenSSL.  Example:

              olcTLSCipherSuite: HIGH:MEDIUM:+SSLv2

              To check what ciphers a given spec selects in OpenSSL, use:

                   openssl ciphers -v <cipher-suite-spec>

              To obtain the list of ciphers in GNUtls use:

                   gnutls-cli -l

       olcTLSCACertificateFile: <filename>
              Specifies  the  file  that  contains certificates for all of the
              Certificate Authorities that slapd will recognize.

       olcTLSCACertificatePath: <path>
              Specifies the path of  a  directory  that  contains  Certificate
              Authority  certificates  in  separate  individual files. Usually
              only one of this or the olcTLSCACertificateFile is  defined.  If
              both  are specified, both locations will be used. This directive
              is not supported when using GNUtls.

       olcTLSCertificateFile: <filename>
              Specifies the file that contains the slapd server certificate.

       olcTLSCertificateKeyFile: <filename>
              Specifies the file that contains the slapd  server  private  key
              that matches the certificate stored in the olcTLSCertificateFile
              file. If the private key  is  protected  with  a  password,  the
              password  must  be manually typed in when slapd starts.  Usually
              the private key is not protected with a password, to allow slapd
              to  start  without  manual  intervention,  so  it is of critical
              importance that the file is protected carefully.

       olcTLSDHParamFile: <filename>
              This directive specifies the file that contains  parameters  for
              Diffie-Hellman  ephemeral  key  exchange.   This  is required in
              order to use a DSA certificate on the server. If  multiple  sets
              of  parameters  are  present  in  the  file, all of them will be
              processed.  Note  that  setting  this  option  may  also  enable
              Anonymous  Diffie-Hellman  key  exchanges in certain non-default
              cipher suites.  You should append "!ADH" to your  cipher  suites
              if  you  have  changed  them  from  the  default,  otherwise  no
              certificate exchanges or verification will be done.  When  using
              GNUtls  these  parameters  are always generated randomly so this
              directive is ignored.

       olcTLSRandFile: <filename>
              Specifies  the  file   to   obtain   random   bits   from   when
              /dev/[u]random  is  not available.  Generally set to the name of
              the EGD/PRNGD socket.  The  environment  variable  RANDFILE  can
              also be used to specify the filename.  This directive is ignored
              with GNUtls.

       olcTLSVerifyClient: <level>
              Specifies what checks to perform on client  certificates  in  an
              incoming  TLS  session, if any.  The <level> can be specified as
              one of the following keywords:

              never  This is the default.  slapd will not ask the client for a

              allow  The  client  certificate is requested.  If no certificate
                     is provided, the session proceeds  normally.   If  a  bad
                     certificate  is  provided,  it  will  be  ignored and the
                     session proceeds normally.

              try    The client certificate is requested.  If  no  certificate
                     is  provided,  the  session  proceeds normally.  If a bad
                     certificate  is  provided,  the  session  is  immediately

              demand | hard | true
                     These  keywords  are  all  equivalent,  for compatibility
                     reasons.  The client certificate  is  requested.   If  no
                     certificate   is   provided,  or  a  bad  certificate  is
                     provided, the session is immediately terminated.

                     Note that a valid client certificate is required in order
                     to  use the SASL EXTERNAL authentication mechanism with a
                     TLS session.  As such, a  non-default  olcTLSVerifyClient
                     setting   must   be   chosen   to  enable  SASL  EXTERNAL

       olcTLSCRLCheck: <level>
              Specifies if the Certificate Revocation List  (CRL)  of  the  CA
              should  be  used  to  verify if the client certificates have not
              been revoked. This requires olcTLSCACertificatePath parameter to
              be  set.  This parameter is ignored with GNUtls.  <level> can be
              specified as one of the following keywords:

              none   No CRL checks are performed

              peer   Check the CRL of the peer certificate

              all    Check the CRL for a whole certificate chain

       olcTLSCRLFile: <filename>
              Specifies a file containing a Certificate Revocation List to  be
              used for verifying that certificates have not been revoked. This
              parameter is only valid when using GNUtls.


       If slapd is compiled  with  --enable-modules  then  the  module-related
       entries    will    be    available.    These    entries    are    named
       cn=module{x},cn=config and must have the olcModuleList objectClass. One
       entry  should be created per olcModulePath.  Normally the config engine
       generates the "{x}" index in  the  RDN  automatically,  so  it  can  be
       omitted when initially loading these entries.

       olcModuleLoad: <filename>
              Specify  the  name of a dynamically loadable module to load. The
              filename may be an absolute path name or a simple filename. Non-
              absolute  names are searched for in the directories specified by
              the olcModulePath option.

       olcModulePath: <pathspec>
              Specify a list of directories to search  for  loadable  modules.
              Typically  the  path  is colon-separated but this depends on the
              operating system.


       Schema definitions are created as entries  in  the  cn=schema,cn=config
       subtree.  These  entries must have the olcSchemaConfig objectClass.  As
       noted above, the actual cn=schema,cn=config entry is predefined and any
       values specified for it are ignored.

       olcAttributetypes:     ( <oid>    [NAME <name>]    [DESC <description>]
              [OBSOLETE]   [SUP <oid>]    [EQUALITY <oid>]    [ORDERING <oid>]
              [SUBSTR <oid>]   [SYNTAX <oidlen>]  [SINGLE-VALUE]  [COLLECTIVE]
              [NO-USER-MODIFICATION] [USAGE <attributeUsage>] )
              Specify an attribute type using the LDAPv3 syntax defined in RFC
              4512.   The  slapd  parser  extends  the  RFC 4512 definition by
              allowing string forms as well as numeric OIDs to be used for the
              attribute    OID   and   attribute   syntax   OID.    (See   the
              olcObjectIdentifier description.)

       olcDitContentRules:    ( <oid>    [NAME <name>]    [DESC <description>]
              [OBSOLETE]      [AUX <oids>]      [MUST <oids>]     [MAY <oids>]
              [NOT <oids>] )
              Specify an DIT Content Rule using the LDAPv3 syntax  defined  in
              RFC  4512.   The slapd parser extends the RFC 4512 definition by
              allowing string forms as well as numeric OIDs to be used for the
              attribute    OID   and   attribute   syntax   OID.    (See   the
              olcObjectIdentifier description.)

       olcObjectClasses: ( <oid> [NAME <name>] [DESC <description>] [OBSOLETE]
              [SUP <oids>]   [{   ABSTRACT   |   STRUCTURAL   |  AUXILIARY  }]
              [MUST <oids>] [MAY <oids>] )
              Specify an objectclass using the LDAPv3 syntax  defined  in  RFC
              4512.   The  slapd  parser  extends  the  RFC 4512 definition by
              allowing string forms as well as numeric OIDs to be used for the
              object  class  OID.   (See the olcObjectIdentifier description.)
              Object classes are "STRUCTURAL" by default.

       olcObjectIdentifier: <name> { <oid> | <name>[:<suffix>] }
              Define a string name that equates to the given OID.  The  string
              can  be  used  in  place  of  the numeric OID in objectclass and
              attribute definitions. The name can also be used with  a  suffix
              of the form ":xx" in which case the value "oid.xx" will be used.


       Options in these entries only apply to the configuration  of  a  single
       type  of  backend. All backends may support this class of options.  The
       entry must be named olcBackend=<databasetype>,cn=config and  must  have
       the olcBackendConfig objectClass.  <databasetype> should be one of bdb,
       config, dnssrv, hdb, ldap, ldif, meta,  monitor,  null,  passwd,  perl,
       relay, shell, or sql.  At present, no backend implements any options of
       this type.


       Database      options      are      set      in      entries      named
       olcDatabase={x}<databasetype>,cn=config     and     must    have    the
       olcDatabaseConfig objectClass. Normally the config engine generates the
       "{x}"  index  in  the  RDN  automatically,  so  it  can be omitted when
       initially loading these entries.

       The special frontend database is always numbered "{-1}" and the  config
       database is always numbered "{0}".


       Options  in  this section may be set in the special "frontend" database
       and inherited in all the other databases. These options may be  altered
       by  further settings in each specific database. The frontend entry must
       be   named   olcDatabase=frontend,cn=config   and   must    have    the
       olcFrontendConfig objectClass.

       olcAccess: to <what> [ by <who> <access> <control> ]+
              Grant  access (specified by <access>) to a set of entries and/or
              attributes (specified by  <what>)  by  one  or  more  requestors
              (specified  by  <who>).   If no access controls are present, the
              default policy allows anyone and everyone to read  anything  but
              restricts  updates  to  rootdn.   (e.g.,  "olcAccess:  to * by *
              read").  See slapd.access(5) and the  "OpenLDAP  Administrator’s
              Guide" for details.

              Access  controls  set in the frontend are appended to any access
              controls set  on  the  specific  databases.   The  rootdn  of  a
              database  can always read and write EVERYTHING in that database.

              Extra special care must be taken with the access controls on the
              config  database. Unlike other databases, the default policy for
              the config database is to  only  allow  access  to  the  rootdn.
              Regular  users  should  not  have  read access, and write access
              should be granted very carefully to privileged administrators.

       olcDefaultSearchBase: <dn>
              Specify a default search base to use when client submits a  non-
              base  search  request with an empty base DN.  Base scoped search
              requests with an empty base DN are not affected.   This  setting
              is only allowed in the frontend entry.

       olcPasswordHash: <hash> [<hash>...]
              This  option  configures  one  or  more  hashes  to  be  used in
              generation  of  user  passwords  stored  in   the   userPassword
              attribute  during  processing  of  LDAP Password Modify Extended
              Operations (RFC 3062).  The <hash> must be one of {SSHA}, {SHA},
              {SMD5}, {MD5}, {CRYPT}, and {CLEARTEXT}.  The default is {SSHA}.

              {SHA} and {SSHA} use  the  SHA-1  algorithm  (FIPS  160-1),  the
              latter with a seed.

              {MD5}  and  {SMD5}  use the MD5 algorithm (RFC 1321), the latter
              with a seed.

              {CRYPT} uses the crypt(3).

              {CLEARTEXT} indicates that the new password should be  added  to
              userPassword as clear text.

              Note   that   this   option  does  not  alter  the  normal  user
              applications handling of userPassword during LDAP  Add,  Modify,
              or  other  LDAP operations.  This setting is only allowed in the
              frontend entry.

       olcReadOnly: TRUE | FALSE
              This option  puts  the  database  into  "read-only"  mode.   Any
              attempts  to  modify  the  database will return an "unwilling to
              perform" error.  By default, olcReadOnly  is  FALSE.  Note  that
              when this option is set TRUE on the frontend, it cannot be reset
              without restarting the  server,  since  further  writes  to  the
              config database will be rejected.

       olcRequires: <conditions>
              Specify  a  set  of  conditions  to require (default none).  The
              directive  may  be  specified  globally   and/or   per-database;
              databases    inherit    global   conditions,   so   per-database
              specifications are additive.  bind requires bind operation prior
              to  directory  operations.   LDAPv3 requires session to be using
              LDAP  version  3.   authc  requires  authentication   prior   to
              directory  operations.   SASL requires SASL authentication prior
              to directory operations.  strong requires strong  authentication
              prior  to  directory  operations.   The  strong  keyword  allows
              protected   "simple"   authentication   as    well    as    SASL
              authentication.   none  may  be  used  to  require no conditions
              (useful to clear out globally set conditions within a particular
              database); it must occur first in the list of conditions.

       olcRestrict: <oplist>
              Specify  a list of operations that are restricted.  Restrictions
              on  a  specific  database   override   any   frontend   setting.
              Operations   can   be   any   of  add,  bind,  compare,  delete,
              extended[=<OID>], modify, rename, search, or the special pseudo-
              operations read and write, which respectively summarize read and
              write operations.  The use of restrict write  is  equivalent  to
              olcReadOnly:  TRUE  (see above).  The extended keyword allows to
              indicate the OID of the specific operation to be restricted.

       olcSchemaDN: <dn>
              Specify the distinguished name for the subschema  subentry  that
              controls   the   entries   on   this  server.   The  default  is

       olcSecurity: <factors>
              Specify a set of security strength factors (separated  by  white
              space)  to  require  (see  olcSaslSecprops’s minssf option for a
              description of security strength factors).  The directive may be
              specified  globally  and/or per-database.  ssf=<n> specifies the
              overall security strength factor.  transport=<n>  specifies  the
              transport  security  strength factor.  tls=<n> specifies the TLS
              security strength factor.  sasl=<n> specifies the SASL  security
              strength  factor.  update_ssf=<n> specifies the overall security
              strength   factor   to   require    for    directory    updates.
              update_transport=<n>  specifies  the transport security strength
              factor  to  require  for  directory   updates.    update_tls=<n>
              specifies  the  TLS  security  strength  factor  to  require for
              directory updates.  update_sasl=<n> specifies the SASL  security
              strength    factor    to    require   for   directory   updates.
              simple_bind=<n> specifies the security strength factor  required
              for  simple  username/password  authentication.   Note  that the
              transport  factor  is  measure  of  security  provided  by   the
              underlying  transport, e.g. ldapi:// (and eventually IPSEC).  It
              is not normally used.

       olcSizeLimit: {<integer>|unlimited}

       olcSizeLimit: size[.{soft|hard|unchecked}]=<integer> [...]
              Specify the maximum number of entries to return  from  a  search
              operation.   The  default  size  limit is 500.  Use unlimited to
              specify no limits.   The  second  format  allows  a  fine  grain
              setting of the size limits.  Extra args can be added in the same
              value or as additional values.  See olcLimits for an explanation
              of the different flags.

       olcSortVals <attr> [...]
              Specify  a  list  of  multi-valued  attributes whose values will
              always be maintained in sorted order.  Using  this  option  will
              allow   Modify,   Compare,   and  filter  evaluations  on  these
              attributes to be performed more efficiently. The resulting  sort
              order  depends  on the attributes’ syntax and matching rules and
              may not correspond to lexical order or  any  other  recognizable
              order.  This setting is only allowed in the frontend entry.

       olcTimeLimit: {<integer>|unlimited}

       olcTimeLimit: time[.{soft|hard}]=<integer> [...]
              Specify  the maximum number of seconds (in real time) slapd will
              spend answering a search request.  The  default  time  limit  is
              3600.   Use  unlimited  to specify no limits.  The second format
              allows a fine grain setting of the time limits.  Extra args  can
              be  added  in  the  same  value  or  as  additional values.  See
              olcLimits for an explanation of the different flags.


       Options in this section only apply to the specific database  for  which
       they  are defined.  They are supported by every type of backend. All of
       the Global Database Options may also be used here.

       olcHidden: TRUE | FALSE
              Controls whether the database will be used to answer queries.  A
              database  that  is  hidden  will never be selected to answer any
              queries, and any suffix  configured  on  the  database  will  be
              ignored  in  checks  for  conflicts  with  other  databases.  By
              default, olcHidden is FALSE.

       olcLastMod: TRUE | FALSE
              Controls  whether  slapd   will   automatically   maintain   the
              modifiersName,      modifyTimestamp,      creatorsName,      and
              createTimestamp attributes for entries.  It  also  controls  the
              entryCSN  and  entryUUID  attributes,  which  are  needed by the
              syncrepl provider. By default, olcLastMod is TRUE.

       olcLimits: <who> <limit> [<limit> [...]]
              Specify  time  and  size  limits  based  on  who  initiated   an
              operation.  The argument who can be any of

                     anonymous    |   users   |   [dn[.<style>]=]<pattern>   |


                     <style>  ::= exact | base | onelevel | subtree | children
                     | regex | anonymous

              The  term  anonymous  matches  all unauthenticated clients.  The
              term users matches all authenticated clients; otherwise an exact
              dn  pattern  is assumed unless otherwise specified by qualifying
              the (optional) key string dn  with  exact  or  base  (which  are
              synonyms),  to require an exact match; with onelevel, to require
              exactly one level of depth match; with  subtree,  to  allow  any
              level  of depth match, including the exact match; with children,
              to allow any level of  depth  match,  not  including  the  exact
              match;  regex  explicitly  requires the (default) match based on
              POSIX  (’’extended’’)  regular  expression  pattern.    Finally,
              anonymous  matches  unbound  operations;  the  pattern  field is
              ignored.  The same behavior is obtained by using  the  anonymous
              form  of  the  who  clause.   The  term group, with the optional
              objectClass oc and attributeType at fields, followed by pattern,
              sets  the  limits  for  any  DN  listed  in the values of the at
              attribute (default member) of the oc group objectClass  (default
              groupOfNames) whose DN exactly matches pattern.

              The currently supported limits are size and time.

              The  syntax  for  time  limits  is time[.{soft|hard}]=<integer>,
              where  integer  is  the  number  of  seconds  slapd  will  spend
              answering  a  search  request.   If  no time limit is explicitly
              requested by  the  client,  the  soft  limit  is  used;  if  the
              requested  time  limit  exceeds the hard limit, the value of the
              limit is used instead.  If the hard limit is set to the  keyword
              soft, the soft limit is used in either case; if it is set to the
              keyword unlimited, no hard limit is enforced.  Explicit requests
              for  time limits smaller or equal to the hard limit are honored.
              If no limit specifier is set, the value is assigned to the  soft
              limit,  and  the  hard  limit  is  set  to soft, to preserve the
              original behavior.

              The        syntax        for        size        limits        is
              size[.{soft|hard|unchecked}]=<integer>,  where  integer  is  the
              maximum number of entries slapd will return answering  a  search
              request.   If  no  size  limit  is  explicitly  requested by the
              client, the soft limit is used;  if  the  requested  size  limit
              exceeds  the hard limit, the value of the limit is used instead.
              If the hard limit is set to the keyword soft, the soft limit  is
              used  in  either case; if it is set to the keyword unlimited, no
              hard limit is  enforced.   Explicit  requests  for  size  limits
              smaller  or  equal to the hard limit are honored.  The unchecked
              specifier sets a limit on the  number  of  candidates  a  search
              request  is allowed to examine.  The rationale behind it is that
              searches for non-properly indexed attributes may result in large
              sets  of  candidates,  which  must  be  examined  by slapd(8) to
              determine whether they match the  search  filter  or  not.   The
              unchecked  limit provides a means to drop such operations before
              they are even started.  If the selected  candidates  exceed  the
              unchecked  limit,  the  search  will  abort  with  Unwilling  to
              perform.  If it is set to the keyword  unlimited,  no  limit  is
              applied  (the  default).  If it is set to disable, the search is
              not even performed; this can be used to disallow searches for  a
              specific  set of users.  If no limit specifier is set, the value
              is assigned to the soft limit, and the  hard  limit  is  set  to
              soft, to preserve the original behavior.

              In  case  of  no match, the global limits are used.  The default
              values are the same as olcSizeLimit and olcTimeLimit;  no  limit
              is set on unchecked.

              If  pagedResults  control  is  requested, the hard size limit is
              used by default, because the request of a specific page size  is
              considered an explicit request for a limitation on the number of
              entries to be returned.  However, the size limit applies to  the
              total  count of entries returned within the search, and not to a
              single page.  Additional size limits may be enforced; the syntax
              is{<integer>|noEstimate|unlimited},  where  integer is
              the max page size if no  explicit  limit  is  set;  the  keyword
              noEstimate inhibits the server from returning an estimate of the
              total number of  entries  that  might  be  returned  (note:  the
              current  implementation  does  not  return  any  estimate).  The
              keyword unlimited indicates that no  limit  is  applied  to  the
              pagedResults      control     page     size.      The     syntax
              size.prtotal={<integer>|unlimited|disabled}  allows  to  set   a
              limit on the total number of entries that a pagedResults control
              allows to return.  By default it is set to the hard limit.  When
              set,  integer is the max number of entries that the whole search
              with pagedResults control can return.  Use  unlimited  to  allow
              unlimited  number  of  entries to be returned, e.g. to allow the
              use of the pagedResults control as a means  to  circumvent  size
              limitations  on  regular searches; the keyword disabled disables
              the control, i.e. no paged results can be returned.   Note  that
              the  total  number  of  entries  returned  when the pagedResults
              control is requested  cannot  exceed  the  hard  size  limit  of
              regular searches unless extended by the prtotal switch.

       olcMaxDerefDepth: <depth>
              Specifies  the  maximum  number  of  aliases to dereference when
              trying to resolve an entry, used to avoid infinite alias  loops.
              The default is 15.

       olcMirrorMode: TRUE | FALSE
              This  option puts a replica database into "mirror" mode.  Update
              operations  will  be  accepted  from  any  user,  not  just  the
              updatedn.   The  database must already be configured as syncrepl
              consumer before  this  keyword  may  be  set.   This  mode  also
              requires  a  olcServerID  (see  above)  to  be  configured.   By
              default, this setting is FALSE.

       olcPlugin: <plugin_type> <lib_path> <init_function> [<arguments>]
              Configure a SLAPI plugin. See the  slapd.plugin(5)  manpage  for
              more details.

       olcRootDN: <dn>
              Specify  the  distinguished  name  that is not subject to access
              control or administrative limit restrictions for  operations  on
              this  database.   This  DN  may or may not be associated with an
              entry.  An empty root DN (the default) specifies no root  access
              is  to  be  granted.   It is recommended that the rootdn only be
              specified when needed  (such  as  when  initially  populating  a
              database).   If the rootdn is within a namingContext (suffix) of
              the database, a simple bind password may also be provided  using
              the  olcRootPW  directive. Note that the rootdn is always needed
              when using syncrepl.

       olcRootPW: <password>
              Specify a password (or hash of the  password)  for  the  rootdn.
              The  password  can  only  be  set  if  the  rootdn is within the
              namingContext (suffix) of the database.  This option accepts all
              RFC   2307   userPassword  formats  known  to  the  server  (see
              olcPasswordHash   description)    as    well    as    cleartext.
              slappasswd(8)  may  be  used  to  generate a hash of a password.
              Cleartext and {CRYPT} passwords are not recommended.   If  empty
              (the  default),  authentication of the root DN is by other means
              (e.g. SASL).  Use of SASL is encouraged.

       olcSubordinate: [TRUE | FALSE | advertise]
              Specify that the current backend database is  a  subordinate  of
              another  backend database. A subordinate  database may have only
              one suffix. This option may be used to glue  multiple  databases
              into  a  single  namingContext.   If  the  suffix of the current
              database is within the namingContext  of  a  superior  database,
              searches against the superior database will be propagated to the
              subordinate as well. All of  the  databases  associated  with  a
              single namingContext should have identical rootdns.  Behavior of
              other  LDAP  operations  is  unaffected  by  this  setting.   In
              particular,  it  is  not  possible to use moddn to move an entry
              from  one  subordinate  to  another   subordinate   within   the

              If  the  optional advertise flag is supplied, the naming context
              of this database is advertised in the root DSE. The  default  is
              to hide this database context, so that only the superior context
              is visible.

              If the slap tools slapcat(8), slapadd(8),  or  slapindex(8)  are
              used  on  the  superior  database,  any  glued subordinates that
              support these tools are opened as well.

              Databases that are glued together should usually  be  configured
              with the same indices (assuming they support indexing), even for
              attributes that only  exist  in  some  of  these  databases.  In
              general,  all  of  the  glued  databases should be configured as
              similarly as possible,  since  the  intent  is  to  provide  the
              appearance of a single directory.

              Note   that   the   subordinate   functionality  is  implemented
              internally by the glue overlay and as  such  its  behavior  will
              interact  with  other  overlays  in  use.  By  default, the glue
              overlay is automatically configured as the last overlay  on  the
              superior   database.   Its  position  on  the  database  can  be
              explicitly configured by setting an overlay  glue  directive  at
              the  desired  position. This explicit configuration is necessary
              e.g.  when using the syncprov overlay,  which  needs  to  follow
              glue in order to work over all of the glued databases. E.g.
                   dn: olcDatabase={1}bdb,cn=config
                   olcSuffix: dc=example,dc=com

                   dn: olcOverlay={0}glue,olcDatabase={1}bdb,cn=config

                   dn: olcOverlay={1}syncprov,olcDatabase={1}bdb,cn=config
       See the Overlays section below for more details.

       olcSuffix: <dn suffix>
              Specify  the  DN  suffix  of queries that will be passed to this
              backend database.  Multiple suffix lines can  be  given  and  at
              least  one  is  required  for  each database definition.  If the
              suffix of one database is "inside" that of another, the database
              with the inner suffix must come first in the configuration file.

       olcSyncrepl:  rid=<replica   ID>   provider=ldap[s]://<hostname>[:port]
              searchbase=<base     DN>    [type=refreshOnly|refreshAndPersist]
              [interval=dd:hh:mm:ss]   [retry=[<retry    interval>    <#    of
              retries>]+]  [filter=<filter  str>]  [scope=sub|one|base|subord]
              [attrs=<attr   list>]    [exattrs=<attr    list>]    [attrsonly]
              [sizelimit=<limit>]  [timelimit=<limit>] [schemachecking=on|off]
              [network-timeout=<seconds>]                  [timeout=<seconds>]
              [bindmethod=simple|sasl]     [binddn=<dn>]     [saslmech=<mech>]
              [authcid=<identity>] [authzid=<identity>] [credentials=<passwd>]
              [realm=<realm>]  [secprops=<properties>] [starttls=yes|critical]
              [tls_cert=<file>]      [tls_key=<file>]      [tls_cacert=<file>]
              [tls_cacertdir=<path>]      [tls_reqcert=never|allow|try|demand]
              [tls_ciphersuite=<ciphers>]         [tls_crlcheck=none|peer|all]
              [logbase=<base        DN>]        [logfilter=<filter       str>]
              Specify the current database as a replica which is  kept  up-to-
              date  with  the  master  content  by  establishing  the  current
              slapd(8) as a  replication  consumer  site  running  a  syncrepl
              replication engine.  The replica content is kept synchronized to
              the  master  content  using  the  LDAP  Content  Synchronization
              protocol.  Refer  to  the  "OpenLDAP  Administrator’s Guide" for
              detailed information on setting up a replicated slapd  directory
              service using the syncrepl replication engine.

              rid   identifies  the  current  syncrepl  directive  within  the
              replication consumer site.  It is a non-negative integer  having
              no more than three digits.

              provider  specifies the replication provider site containing the
              master content as an LDAP URI.  If  <port>  is  not  given,  the
              standard LDAP port number (389 or 636) is used.

              The  content  of  the syncrepl replica is defined using a search
              specification as its result set. The consumer  slapd  will  send
              search  requests  to  the provider slapd according to the search
              specification. The  search  specification  includes  searchbase,
              scope,   filter,  attrs,  attrsonly,  sizelimit,  and  timelimit
              parameters as in the normal search  specification.  The  exattrs
              option  may  also  be  used to specify attributes that should be
              omitted from incoming entries.  The scope defaults to  sub,  the
              filter  defaults  to  (objectclass=*),  and  there is no default
              searchbase. The attrs list defaults to "*,+" to return all  user
              and  operational attributes, and attrsonly and exattrs are unset
              by default.  The sizelimit and timelimit only accept "unlimited"
              and  positive  integers, and both default to "unlimited".  Note,
              however, that  any  provider-side  limits  for  the  replication
              identity  will  be  enforced  by  the provider regardless of the
              limits requested by the LDAP Content Synchronization  operation,
              much like for any other search operation.

              The  LDAP  Content  Synchronization  protocol  has two operation
              types.  In the refreshOnly operation, the  next  synchronization
              search operation is periodically rescheduled at an interval time
              (specified by interval parameter; 1 day by default)  after  each
              synchronization  operation  finishes.   In the refreshAndPersist
              operation, a synchronization search remains  persistent  in  the
              provider  slapd.   Further  updates  to  the master replica will
              generate searchResultEntry to the consumer slapd as  the  search
              responses to the persistent synchronization search.

              If an error occurs during replication, the consumer will attempt
              to reconnect according to the retry parameter which is a list of
              the  <retry  interval>  and  <# of retries> pairs.  For example,
              retry="60 10 300 3" lets the consumer retry every 60 seconds for
              the first 10 times and then retry every 300 seconds for the next
              3 times before stop retrying. The ‘+’ in <#  of  retries>  means
              indefinite number of retries until success.

              The  schema  checking  can be enforced at the LDAP Sync consumer
              site by turning on the schemachecking parameter. The default  is

              The  network-timeout  parameter  sets how long the consumer will
              wait to establish a network connection to the provider.  Once  a
              connection  is established, the timeout parameter determines how
              long the consumer will wait for  the  initial  Bind  request  to
              complete.   The   defaults   for   these  parameters  come  from

              A  bindmethod  of  simple  requires  the  options   binddn   and
              credentials  and  should  only  be  used  when adequate security
              services (e.g. TLS or IPSEC) are in place.  A bindmethod of sasl
              requires  the  option  saslmech.  Depending on the mechanism, an
              authentication identity  and/or  credentials  can  be  specified
              using  authcid  and  credentials.   The authzid parameter may be
              used to specify an authorization  identity.   Specific  security
              properties  (as with the sasl-secprops keyword above) for a SASL
              bind can be set with the secprops option.  A  non  default  SASL
              realm  can  be  set  with the realm option.  The provider, other
              than allow authentication of the syncrepl identity, should grant
              that  identity appropriate access privileges to the data that is
              being replicated (access directive), and  appropriate  time  and
              size limits (limits directive).

              The  starttls  parameter  specifies use of the StartTLS extended
              operation to establish a  TLS  session  before  Binding  to  the
              provider. If the critical argument is supplied, the session will
              be aborted if the StartTLS request fails. Otherwise the syncrepl
              session  continues without TLS. The tls_reqcert setting defaults
              to "demand" and the other TLS settings default to  the  same  as
              the main slapd TLS settings.

              Rather  than  replicating  whole entries, the consumer can query
              logs of data modifications. This mode of operation  is  referred
              to  as  delta syncrepl. In addition to the above parameters, the
              logbase and logfilter parameters must be set  appropriately  for
              the log that will be used. The syncdata parameter must be set to
              either "accesslog" if the log conforms to the slapo-accesslog(5)
              log  format,  or "changelog" if the log conforms to the obsolete
              changelog format. If the syncdata parameter is omitted or set to
              "default" then the log parameters are ignored.

       olcUpdateDN: <dn>
              This  option  is  only  applicable  in  a  slave  database.   It
              specifies  the  DN  permitted  to  update  (subject  to   access
              controls)  the  replica.  It is only needed in certain push-mode
              replication scenarios.  Generally, this DN  should  not  be  the
              same as the rootdn used at the master.

       olcUpdateRef: <url>
              Specify  the  referral  to  pass  back when slapd(8) is asked to
              modify a replicated local  database.   If  multiple  values  are
              specified, each url is provided.


       Each  database  may  allow  specific  configuration  options;  they are
       documented  separately  in  the  backends’  manual   pages.   See   the
       slapd.backends(5) manual page for an overview of available backends.


       An  overlay  is  a piece of code that intercepts database operations in
       order to extend or change them. Overlays are pushed onto a  stack  over
       the  database,  and so they will execute in the reverse of the order in
       which they were configured and the database itself will receive control
       last of all.

       Overlays  must  be  configured as child entries of a specific database.
       The entry’s RDN must be of the form olcOverlay={x}<overlaytype> and the
       entry  must  have the olcOverlayConfig objectClass. Normally the config
       engine generates the "{x}" index in the RDN automatically, so it can be
       omitted when initially loading these entries.

       See  the  slapd.overlays(5)  manual  page  for an overview of available


       Here is a short example of a configuration in  LDIF  suitable  for  use
       with slapadd(8) :

              dn: cn=config
              objectClass: olcGlobal
              cn: config
              olcPidFile: /var/run/

              olcAttributeOptions: x-hidden lang-
              dn: cn=schema,cn=config
              objectClass: olcSchemaConfig
              cn: schema

              include: /etc/ldap/schema/core.ldif

              dn: olcDatabase=frontend,cn=config
              objectClass: olcDatabaseConfig
              objectClass: olcFrontendConfig
              olcDatabase: frontend
              # Subtypes of "name" (e.g. "cn" and "ou") with the
              # option ";x-hidden" can be searched for/compared,
              # but are not shown.  See slapd.access(5).
              olcAccess: to attrs=name;x-hidden by * =cs
              # Protect passwords.  See slapd.access(5).
              olcAccess: to attrs=userPassword  by * auth
              # Read access to other attributes and entries.
              olcAccess: to * by * read

              # set a rootpw for the config database so we can bind.
              # deny access to everyone else.
              dn: olcDatabase=config,cn=config
              objectClass: olcDatabaseConfig
              olcDatabase: config
              olcRootPW: {SSHA}XKYnrjvGT3wZFQrDD5040US592LxsdLy
              olcAccess: to * by * none

              dn: olcDatabase=bdb,cn=config
              objectClass: olcDatabaseConfig
              objectClass: olcBdbConfig
              olcDatabase: bdb
              olcSuffix: "dc=our-domain,dc=com"
              # The database directory MUST exist prior to
              # running slapd AND should only be accessible
              # by the slapd/tools. Mode 0700 recommended.
              olcDbDirectory: /var/lib/ldap
              # Indices to maintain
              olcDbIndex:     objectClass  eq
              olcDbIndex:     cn,sn,mail   pres,eq,approx,sub

              # We serve small clients that do not handle referrals,
              # so handle remote lookups on their behalf.
              dn: olcDatabase=ldap,cn=config
              objectClass: olcDatabaseConfig
              objectClass: olcLdapConfig
              olcDatabase: ldap
              olcSuffix: ""
              olcDbUri: ldap://

       Assuming the above data was saved in a file named "config.ldif" and the
       /etc/ldap/slapd.d  directory  has  been  created,  this  command   will
       initialize the configuration:
              slapadd -F /etc/ldap/slapd.d -n 0 -l config.ldif

       "OpenLDAP Administrator’s Guide" contains a longer annotated example of
       a slapd configuration.

       Alternatively, an existing slapd.conf file can be converted to the  new
       format using slapd or any of the slap tools:
              slaptest -f /etc/ldap/slapd.conf -F /etc/ldap/slapd.d


              default slapd configuration file

              default slapd configuration directory


       ldap(3),  ldif(5),  slapd.access(5),  slapd.backends(5), slapd.conf(5),
       slapd.overlays(5),    slapd.plugin(5),    slapd.replog(5),    slapd(8),
       slapacl(8),    slapadd(8),    slapauth(8),    slapcat(8),    slapdn(8),
       slapindex(8), slappasswd(8), slaptest(8).

       "OpenLDAP Administrator’s Guide" (


       OpenLDAP Software is developed and maintained by The  OpenLDAP  Project
       <>.    OpenLDAP   Software   is   derived  from
       University of Michigan LDAP 3.3 Release.