Provided by: slapd_2.4.23-0ubuntu3_i386 bug

NAME

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

SYNOPSIS

       /etc/ldap/slapd.conf

DESCRIPTION

       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
       case-sensitive.

       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
       file.

GLOBAL CONFIGURATION OPTIONS

       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
              details.

       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
              `x-foo-bar-baz'.

              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
              succeed.

              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:

                     ldap:///<base>??[<scope>]?<filter>
                     dn[.<dnstyle>]:<pattern>
                     u[.<mech>[/<realm>]]:<pattern>
                     group[/objectClass[/attributeType]]:<pattern>
                     <pattern>

                     <dnstyle>:={exact|onelevel|children|subtree|regex}

              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>
              forms.

       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

                     UID=<username>[[,CN=<realm>],CN=<mechanism>],CN=auth

              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.

                     UID=([^,]*),CN=.*

              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.

                     UID=$1,OU=Accounts,DC=example,DC=com

              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.

                     ldap:///OU=Accounts,DC=example,DC=com??one?(UID=$1)

              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
              subject.

              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
              2.

       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.

       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
                             backends
                      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
              logs.

       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
              3062).

              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
              conditions.

       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
              processing.

       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
              "cn=Subschema".

       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
              order.

       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.

TLS OPTIONS

       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 OpenSSL.  Example:

              TLSCipherSuite HIGH:MEDIUM:+SSLv2

              To check what ciphers a given spec selects, use:

                   openssl ciphers -v <cipher-suite-spec>

              To obtain the list of ciphers in GNUtls use:

                   gnutls-cli -l

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

       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.

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

       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
              carefully.

       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.

       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.

       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
                     certificate.

              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
                     terminated.

              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
                     authentication.

       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.   <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.

GENERAL BACKEND OPTIONS

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

       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.

GENERAL DATABASE OPTIONS

       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.

       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>    |
                     group[/oc[/at]]=<pattern>

              with

                     <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  size.pr={<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
              namingContext.

              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

       sync_use_subentry
              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]
              [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
              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.  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
              ldap.conf(5).

              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.

              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.

DATABASE-SPECIFIC OPTIONS

       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.

EXAMPLES

       Here is a short example of a configuration file:

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

              # 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://ldap.some-server.com/
              lastmod   off

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

FILES

       /etc/ldap/slapd.conf
              default slapd configuration file

SEE ALSO

       ldap(3),    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" (http://www.OpenLDAP.org/doc/admin/)

ACKNOWLEDGEMENTS

       OpenLDAP  Software  is developed and maintained by The OpenLDAP Project
       <http://www.openldap.org/>.   OpenLDAP   Software   is   derived   from
       University of Michigan LDAP 3.3 Release.