Provided by: slapd_2.4.28-1.1ubuntu4_i386 bug


       slapd.conf - configuration file for slapd, the stand-alone LDAP daemon




       The  file  /etc/ldap/slapd.conf  contains configuration information for
       the slapd(8) daemon.  This configuration file is also used by the SLAPD
       tools   slapacl(8),  slapadd(8),  slapauth(8),  slapcat(8),  slapdn(8),
       slapindex(8), and slaptest(8).

       The slapd.conf file  consists  of  a  series  of  global  configuration
       options  that  apply  to  slapd  as  a  whole (including all backends),
       followed by zero or more  database  backend  definitions  that  contain
       information  specific to a backend instance.  The configuration options
       are case-insensitive; their value, on a case  by  case  basis,  may  be

       The general format of slapd.conf is as follows:

           # comment - these options apply to every database
           <global configuration options>
           # first database definition & configuration options
           database <backend 1 type>
           <configuration options specific to backend 1>
           # subsequent database definitions & configuration options

       As  many  backend-specific sections as desired may be included.  Global
       options can be overridden in a backend (for options  that  appear  more
       than once, the last appearance in the slapd.conf file is used).

       If  a  line begins with white space, it is considered a continuation of
       the previous line.  No physical line should be over 2000 bytes long.

       Blank lines and comment  lines  beginning  with  a  `#'  character  are
       ignored.    Note:  continuation  lines  are  unwrapped  before  comment
       processing is applied.

       Arguments on configuration lines are separated by white  space.  If  an
       argument  contains  white  space,  the  argument  should be enclosed in
       double quotes.  If an argument contains  a  double  quote  (`"')  or  a
       backslash  character  (`\'),  the  character  should  be  preceded by a
       backslash character.

       The specific configuration options available are discussed below in the
       Global  Configuration  Options,  General  Backend  Options, and General
       Database  Options.   Backend-specific  options  are  discussed  in  the
       slapd-<backend>(5)    manual    pages.     Refer   to   the   "OpenLDAP
       Administrator's Guide" for more  details  on  the  slapd  configuration


       Options  described  in  this  section  apply  to  all  backends, unless
       specifically overridden in a backend definition. Arguments that  should
       be replaced by actual text are shown in brackets <>.

       access 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., "access to * by * read").
              The  rootdn  can  always  read  and   write   EVERYTHING!    See
              slapd.access(5)  and  the "OpenLDAP's Administrator's Guide" for

       allow <features>
              Specify a set of features (separated by white  space)  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 limits).

       argsfile <filename>
              The  (absolute) name of a file that will hold the slapd server's
              command line (program name and options).

       attributeoptions [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  attributeoptions
              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.

       attributetype  ( <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
              objectidentifier description.)

       authid-rewrite<cmd> <args>
              Used by the authentication  framework  to  convert  simple  user
              names  to  an  LDAP  DN  used  for  authorization purposes.  Its
              purpose is analogous to that of authz-regexp (see  below).   The
              prefix  authid- is followed by a set of rules analogous to those
              described in slapo-rwm(5) for data rewriting (replace  the  rwm-
              prefix  with  authid-).   authid-rewrite<cmd>  and  authz-regexp
              rules should not be intermixed.

       authz-policy <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
              authz-regexp statement  (see  below);  significantly,  the  URI,
              provided  it results in exactly one entry, and the dn.exact:<dn>

       authz-regexp <match> <replace>
              Used by the authentication  framework  to  convert  simple  user
              names,  such  as  provided  by SASL subsystem, or extracted from
              certificates in case of cert-based SASL  EXTERNAL,  or  provided
              within  the RFC 4370 "proxied authorization" control, to an LDAP
              DN used for authorization purposes.  Note that the resulting  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 authz-regexp options can be given in the  configuration
              file  to  allow  for multiple matching and replacement patterns.
              The matching patterns are checked in the order  they  appear  in
              the file, stopping at the first successful match.

       concurrency <integer>
              Specify  a  desired  level  of  concurrency.   Provided  to  the
              underlying thread system as a  hint.   The  default  is  not  to
              provide any hint.

       conn_max_pending <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.

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

       defaultsearchbase <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.

       disallow <features>
              Specify a set of features (separated by white space) 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).
              proxy_authz_non_critical  disables  acceptance  of  the  proxied
              authorization  control  (RFC4370)  when  criticality  is  FALSE.
              dontusecopy_non_critical  disables acceptance of the dontUseCopy
              control (a work in progress) when criticality is FALSE.

       ditcontentrule ( <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
              objectidentifier description.)

       gentlehup { on | off }
              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 off.  You may wish to
              use idletimeout along with this option.

       idletimeout <integer>
              Specify the number of seconds to wait before forcibly closing an
              idle  client  connection.   A  idletimeout  of  0  disables this
              feature.  The default is  0.  You  may  also  want  to  set  the
              writetimeout option.

       include <filename>
              Read  additional  configuration  information from the given file
              before continuing with the next line of the current file.

       index_intlen <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.

       index_substr_if_minlen <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

       index_substr_if_maxlen <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.

       index_substr_any_len <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
              index_substr_if_maxlen value.

       index_substr_any_step <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).

       ldapsyntax ( <oid> [DESC <description>] [X-SUBST <substitute-syntax>] )

              Specify an LDAP syntax 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
              syntax  OID.  (See the objectidentifier description.)  The slapd
              parser also honors the X-SUBST extension  (an  OpenLDAP-specific
              extension),  which  allows  to  use  the ldapsyntax statement to
              define a non-implemented syntax along with another  syntax,  the
              extension value substitute-syntax, as its temporary replacement.
              The substitute-syntax must be defined.  This  allows  to  define
              attribute  types that make use of non-implemented syntaxes using
              the  correct  syntax  OID.   Unless  X-SUBST   is   used,   this
              configuration  statement  would  result  in  an  error, since no
              handlers would be associated to the resulting syntax structure.

       listener-threads <integer>
              Specify the number of threads to use for the connection manager.
              The default is 1 and this is typically adequate for up to 16 CPU
              cores.  The value should be set to a power of 2.

       localSSF <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  sasl-secprops's  minssf  option
              description.  The default is 71.

       logfile <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.

       loglevel <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)   connections,   LDAP   operations,
                            results (recommended)
                     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

                  loglevel 129
                  loglevel 0x81
                  loglevel 128 1
                  loglevel 0x80 0x1
                  loglevel 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  loglevel
              to  be  logged.   In  fact,  if loglevel is set to 0, no logging
              occurs, so at least the none level  is  required  to  have  high
              priority messages logged.

              The  loglevel defaults to stats.  This level should usually also
              be included when using other  loglevels,  to  help  analyze  the

       moduleload <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 modulepath option. This option and the modulepath option are
              only usable if slapd was compiled with --enable-modules.

       modulepath <pathspec>
              Specify  a  list  of directories to search for loadable modules.
              Typically the path is colon-separated but this  depends  on  the
              operating  system.  The default is /usr/lib/ldap, which is where
              the standard OpenLDAP install will place its modules.

       objectclass  ( <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  objectidentifier  description.)
              Object classes are "STRUCTURAL" by default.

       objectidentifier <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.

       password-hash <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.

       password-crypt-salt-format <format>
              Specify  the  format  of  the  salt  passed  to  crypt(3)   when
              generating   {CRYPT}   passwords   (see   password-hash)  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.

       pidfile <filename>
              The  (absolute) name of a file that will hold the slapd server's
              process ID (see getpid(2)).

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

       require <conditions>
              Specify a set  of  conditions  (separated  by  white  space)  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

       reverse-lookup on | off
              Enable/disable client name unverified reverse lookup (default is
              off if compiled with --enable-rlookups).

       rootDSE <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.

       sasl-auxprops <plugin> [...]
              Specify which auxprop plugins to use for authentication lookups.
              The  default is empty, which just uses slapd's internal support.
              Usually no other auxprop plugins are needed.

       sasl-host <fqdn>
              Used to specify the fully qualified domain name  used  for  SASL

       sasl-realm <realm>
              Specify SASL realm.  Default is empty.

       sasl-secprops <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.

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

       security <factors>
              Specify a set of security strength factors (separated  by  white
              space)  to  require  (see  sasl-secprops'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.

       serverID <integer> [<URL>]
              Specify an integer ID from 0 to 4095 for this server (limited to
              3  hexadecimal  digits).   The  ID  may  also  be specified as a
              hexadecimal ID by prefixing the value with "0x".  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:

            serverID 1

       sizelimit {<integer>|unlimited}

       sizelimit 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 on the same
              line.  See limits for an explanation of the different flags.

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

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

       sortvals <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

       tcp-buffer [listener=<URL>] [{read|write}=]<size>
              Specify  the  size  of  the TCP buffer.  A global value for both
              read and write TCP buffers related to any listener  is  defined,
              unless  the listener is explicitly specified, or either the read
              or write qualifiers are used.  See  tcp(7)  for  details.   Note
              that some OS-es implement automatic TCP buffer tuning.

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

       timelimit {<integer>|unlimited}

       timelimit 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 on the same line.  See limits for an explanation of the
              different flags.

       tool-threads <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.

       writetimeout <integer>
              Specify  the number of seconds to wait before forcibly closing a
              connection with an outstanding write. This allows recovery  from
              various  network  hang conditions.  A writetimeout of 0 disables
              this feature.  The default is 0.


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

       TLSCipherSuite <cipher-suite-spec>
              Permits  configuring  what  ciphers  will  be  accepted  and the
              preference  order.   <cipher-suite-spec>  should  be  a   cipher
              specification  for  the  TLS library in use (OpenSSL, GnuTLS, or
              Mozilla NSS).  Example:

                            TLSCipherSuite HIGH:MEDIUM:+SSLv2

                            TLSCiphersuite SECURE256:!AES-128-CBC

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

                   openssl ciphers -v <cipher-suite-spec>

              With GnuTLS the available specs can be found in the manual  page
              of gnutls-cli(1) (see the description of the option --priority).

              In  older  versions of GnuTLS, where gnutls-cli does not support
              the option --priority, you can obtain the — more limited —  list
              of ciphers by calling:

                   gnutls-cli -l

              When  using Mozilla NSS, the OpenSSL cipher suite specifications
              are used and translated  into  the  format  used  internally  by
              Mozilla  NSS.  There isn't an easy way to list the cipher suites
              from the command line.  The authoritative list is in the  source
              code for Mozilla NSS in the file sslinfo.c in the structure
                      static const SSLCipherSuiteInfo suiteInfo[]

       TLSCACertificateFile <filename>
              Specifies  the  file  that  contains certificates for all of the
              Certificate  Authorities  that  slapd   will   recognize.    The
              certificate  for  the CA that signed the server certificate must
              be included among these certificates. If the signing CA was  not
              a  top-level  (root) CA, certificates for the entire sequence of
              CA's from the signing CA to the top-level CA should be  present.
              Multiple certificates are simply appended to the file; the order
              is not significant.

       TLSCACertificatePath <path>
              Specifies the path of  a  directory  that  contains  Certificate
              Authority  certificates  in  separate  individual files. Usually
              only one of this  or  the  TLSCACertificateFile  is  used.  This
              directive is not supported when using GnuTLS.

              When  using  Mozilla  NSS,  <path>  may  contain  a  Mozilla NSS
              cert/key database.  If <path> contains a  Mozilla  NSS  cert/key
              database  and  CA  cert  files,  OpenLDAP  will use the cert/key
              database and will ignore the CA cert files.

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

              When using Mozilla NSS, if using a cert/key database  (specified
              with  TLSCACertificatePath),  TLSCertificateFile  specifies  the
              name of the certificate to use:
                   TLSCertificateFile Server-Cert
              If using a token other than the internal built in token, specify
              the token name first, followed by a colon:
                   TLSCertificateFile my hardware device:Server-Cert
              Use certutil -L to list the certificates by name:
                   certutil -d /path/to/certdbdir -L

       TLSCertificateKeyFile <filename>
              Specifies  the  file  that contains the slapd server private key
              that matches the certificate stored  in  the  TLSCertificateFile
              file.   Currently,  the private key must not be protected with a
              password, so it is of critical importance that it  is  protected

              When using Mozilla NSS, TLSCertificateKeyFile specifies the name
              of a file that  contains  the  password  for  the  key  for  the
              certificate  specified  with  TLSCertificateFile.   The  modutil
              command can be used to turn  off  password  protection  for  the
              cert/key   database.    For   example,  if  TLSCACertificatePath
              specifes /etc/openldap/certdb as the location  of  the  cert/key
              database,  use  modutil  to  change  the  password  to the empty
                   modutil -dbdir /etc/openldap/certdb -changepw 'NSS Certificate DB'
              You must have the old password,  if  any.   Ignore  the  WARNING
              about the running browser.  Press 'Enter' for the new password.

       TLSDHParamFile <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.   This  directive  is ignored when using
              Mozilla NSS.

       TLSRandFile <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 and Mozilla NSS.

       TLSVerifyClient <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  TLSVerifyClient
                     setting   must   be   chosen   to  enable  SASL  EXTERNAL

       TLSCRLCheck <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 TLSCACertificatePath parameter to be
              set.  This  directive  is  ignored  with GnuTLS and Mozilla NSS.
              <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

       TLSCRLFile <filename>
              Specifies a file containing a Certificate Revocation List to  be
              used for verifying that certificates have not been revoked. This
              directive is only valid when using GnuTLS and Mozilla NSS.


       Options in this section only apply to the  configuration  file  section
       for  the  specified  backend.   They  are  supported  by  every type of

       backend <databasetype>
              Mark the  beginning  of  a  backend  definition.  <databasetype>
              should  be  one  of  bdb, config, dnssrv, hdb, ldap, ldif, meta,
              monitor, null, passwd, perl, relay, shell, or sql, depending  on
              which backend will serve the database.


       Options  in  this  section only apply to the configuration file section
       for the database in which they are  defined.   They  are  supported  by
       every  type of backend.  Note that the database and at least one suffix
       option are mandatory for each database.

       database <databasetype>
              Mark the  beginning  of  a  new  database  instance  definition.
              <databasetype>  should be one of bdb, config, dnssrv, hdb, ldap,
              ldif, meta, monitor, null, passwd, perl, relay, shell,  or  sql,
              depending on which backend will serve the database.

              LDAP operations, even subtree searches, normally access only one
              database.  That can be changed by gluing databases together with
              the  subordinate keyword.  Access controls and some overlays can
              also involve multiple databases.

       add_content_acl on | off
              Controls whether Add operations will perform ACL checks  on  the
              content  of the entry being added. This check is off by default.
              See the slapd.access(5) manual page  for  more  details  on  ACL
              requirements for Add operations.

       extra_attrs <attrlist>
              Lists  what  attributes  need  to  be  added to search requests.
              Local storage backends return the entire entry to the  frontend.
              The   frontend  takes  care  of  only  returning  the  requested
              attributes that are allowed by  ACLs.   However,  features  like
              access checking and so may need specific attributes that are not
              automatically returned by remote storage  backends,  like  proxy
              backends and so on.  <attrlist> is a list of attributes that are
              needed  for  internal  purposes  and  thus  always  need  to  be
              collected, even when not explicitly requested by clients.

       hidden on | off
              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, hidden is off.

       lastmod on | off
              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, lastmod is on.

       limits <selector> <limit> [<limit> [...]]
              Specify  time and size limits based on the operation's initiator
              or base DN.  The argument <selector> can be any of

                     anonymous    |    users    |    [<dnspec>=]<pattern>    |


                     <dnspec> ::= dn[.<type>][.<style>]

                     <type>  ::= self | this

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

              DN type self is the default and means the bound user, while this
              means  the base DN of the operation.  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 <selector> 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 disabled, 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 for sizelimit and timelimit; 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.

              The limits statement is  typically  used  to  let  an  unlimited
              number  of  entries  be  returned by searches performed with the
              identity used by the consumer for  synchronization  purposes  by
              means of the RFC 4533 LDAP Content Synchronization protocol (see
              syncrepl for details).

       maxderefdepth <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.

       mirrormode on | off
              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 a syncrepl
              consumer before this keyword may be set. This mode also requires
              a serverID (see above) to be configured.  By default, mirrormode
              is off.

       monitoring on | off
              This  option  enables  database-specific monitoring in the entry
              related to the current database in the "cn=Databases,cn=Monitor"
              subtree  of  the  monitor  database,  if the monitor database is
              enabled.  Currently, only the BDB and the HDB databases  provide
              database-specific   monitoring.   The  default  depends  on  the
              backend type.

       overlay <overlay-name>
              Add the specified overlay to this  database.  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. See the slapd.overlays(5) manual
              page for an overview of the available overlays.  Note  that  all
              of  the  database's regular settings should be configured before
              any overlay settings.

       readonly on | off
              This option  puts  the  database  into  "read-only"  mode.   Any
              attempts  to  modify  the  database will return an "unwilling to
              perform" error.  By default, readonly is off.

       restrict <oplist>
              Specify a whitespace  separated  list  of  operations  that  are
              restricted.    If   defined  inside  a  database  specification,
              restrictions apply only to that  database,  otherwise  they  are
              global.   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
              readonly  on  (see  above).   The  extended  keyword  allows  to
              indicate the OID of the specific operation to be restricted.

       rootdn <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  rootpw  directive.  Many   optional   features,   including
              syncrepl, require the rootdn to be defined for the database.

       rootpw <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
              password-hash  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.

       suffix <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.   You  may also want to glue such databases
              together with the subordinate keyword.

       subordinate [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  backend. Its position on the backend 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.
                   database bdb
                   suffix dc=example,dc=com
                   overlay glue
                   overlay syncprov

              Store  the  syncrepl  contextCSN  in  a  subentry instead of the
              context entry of  the  database.  The  subentry's  RDN  will  be
              "cn=ldapsync".  By  default  the  contextCSN  is  stored  in the
              context entry.

       syncrepl    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>]     [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>]
              [keepalive=<idle>:<probes>:<interval>]   [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]
              [suffixmassage=<real DN>] [logbase=<base DN>] [logfilter=<filter
              str>] [syncdata=default|accesslog|changelog]
              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 not
              greater than 999 (limited to three decimal 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 scope
              defaults to sub, the filter defaults to  (objectclass=*),  while
              there is no default searchbase. The attrs list defaults to "*,+"
              to return all user and operational attributes, and attrsonly  is
              unset  by  default.   The  sizelimit  and  timelimit only accept
              "unlimited"  and  positive  integers,  and   both   default   to
              "unlimited".   The  sizelimit  and timelimit parameters define a
              consumer requested limitation on the number of entries that  can
              be  returned  by  the LDAP Content Synchronization operation; as
              such, it is intended to implement partial replication  based  on
              the  size of the replicated database and on the time required by
              the synchronization.   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

              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.   If  no  retry  was
              specified, by default syncrepl retries every hour forever.

              The  schema  checking  can be enforced at the LDAP Sync consumer
              site by turning on the schemachecking parameter. The default  is
              off.  Schema checking on means that replicated entries must have
              a structural objectClass, must obey to objectClass  requirements
              in   terms  of  required/allowed  attributes,  and  that  naming
              attributes and distinguished  values  must  be  present.   As  a
              consequence,   schema   checking  should  be  off  when  partial
              replication is used.

              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.  REMEMBER: simple
              bind credentials must be in cleartext!   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 identity used for
              synchronization by the consumer should be allowed to receive  an
              unlimited  number  of  entries  in response to a search request.
              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.  This can be
              accomplished  by  either  allowing   unlimited   sizelimit   and
              timelimit,  or by setting an appropriate limits statement in the
              consumer's configuration (see sizelimit and limits for details).

              The keepalive parameter sets the values  of  idle,  probes,  and
              interval  used  to  check whether a socket is alive; idle is the
              number of seconds a connection needs to remain idle  before  TCP
              starts sending keepalive probes; probes is the maximum number of
              keepalive probes TCP should send before dropping the connection;
              interval  is  interval  in  seconds between individual keepalive
              probes.  Only some systems support the  customization  of  these
              values;  the  keepalive  parameter  is  ignored  otherwise,  and
              system-wide settings are used.

              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.

              The suffixmassage parameter allows the consumer to pull  entries
              from  a  remote directory whose DN suffix differs from the local
              directory. The portion of the remote entries' DNs  that  matches
              the searchbase will be replaced with the suffixmassage DN.

              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.

       updatedn <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.

       updateref <url>
              Specify  the  referral  to  pass  back when slapd(8) is asked to
              modify a  replicated  local  database.   If  specified  multiple
              times, 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.


       Here is a short example of a configuration file:

              include   /etc/ldap/schema/core.schema
              pidfile   /var/run/

              # 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).
              attributeoptions x-hidden lang-
              access to attrs=name;x-hidden by * =cs

              # Protect passwords.  See slapd.access(5).
              access    to attrs=userPassword  by * auth
              # Read access to other attributes and entries.
              access    to *  by * read

              database  bdb
              suffix    "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.
              directory /var/lib/ldap
              # Indices to maintain
              index     objectClass  eq
              index     cn,sn,mail   pres,eq,approx,sub

              # We serve small clients that do not handle referrals,
              # so handle remote lookups on their behalf.
              database  ldap
              suffix    ""
              uri       ldap://
              lastmod   off

       "OpenLDAP Administrator's Guide" contains a longer annotated example of
       a configuration file.  The  original  /etc/ldap/slapd.conf  is  another


              default slapd configuration file


       ldap(3),      gnutls-cli(1),      slapd-config(5),     slapd.access(5),
       slapd.backends(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.