Provided by: slapd_2.4.42+dfsg-2ubuntu3.13_amd64 bug


       slapd-config - configuration backend to slapd




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

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

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

                     dynamically loaded modules

                     schema definitions

                     backend-specific settings

                     database-specific settings

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

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

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

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

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

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

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


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

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

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

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

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

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

       olcAuthIDRewrite: <rewrite-rule>
              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
              olcAuthzRegexp  (see below).  The rewrite-rule is a set of rules analogous to those
              described in slapo-rwm(5) for data rewriting (after  stripping  the  rwm-  prefix).
              olcAuthIDRewrite and olcAuthzRegexp should not be intermixed.

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

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



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

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


              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 subject.

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

              Note  that  changes  to  olcAuthzRegexp  take  effect  the  next time the server is
              started, not immediately upon changing the configuration.

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

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

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

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

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

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

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

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

       olcIndexSubstrIfMinlen: <integer>
              Specify the minimum length for subinitial and subfinal indices. An attribute  value
              must  have  at  least this many characters in order to be processed by the indexing
              functions. The default is 2.

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

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

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

       olcListenerThreads: <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.

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

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

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

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

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

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

       olcPidFile: <filename>
              The (absolute) name of a file that will hold the slapd  server's  process  ID  (see

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

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

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

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

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

       olcSaslAuxprops: <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.

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

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

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

       olcServerID: <integer> [<URL>]
              Specify  an  integer  ID  from  0 to 4095 for this server (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:

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

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

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

       olcTCPBuffer [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.

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

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

       olcWriteTimeout: <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
              setting 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.

       olcTLSCipherSuite: <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:

                            olcTLSCipherSuite: 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[]

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

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

              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.

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

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

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

              When using Mozilla NSS, olcTLSCertificateKeyFile specifies the name of a file  that
              contains   the   password   for   the   key  for  the  certificate  specified  with
              olcTLSCertificateFile.  The modutil command  can  be  used  to  turn  off  password
              protection  for  the  cert/key  database.   For example, if olcTLSCACertificatePath
              specifes /etc/openldap/certdb as the location of the cert/key database, use modutil
              to change the password to the empty string:
                   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.

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

       olcTLSProtocolMin: <major>[.<minor>]
              Specifies  minimum SSL/TLS protocol version that will be negotiated.  If the server
              doesn't support at least that version, the SSL handshake will fail.  To require TLS
              1.x or higher, set this option to 3.(x+1), e.g.,

                   olcTLSProtocolMin: 3.2

              would  require TLS 1.1.  Specifying a minimum that is higher than that supported by
              the OpenLDAP implementation will result in it requiring the highest level  that  it
              does support.  This directive is ignored with GnuTLS.

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

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

              never  This is the default.  slapd will not ask the client for a 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  olcTLSVerifyClient  setting  must be chosen to enable SASL EXTERNAL

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

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


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

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

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


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

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

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

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

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


       Options in these entries only apply to the configuration of a single type of backend.  All
       backends  may  support  this  class  of options, but currently none do.  The entry must be
       named olcBackend=<databasetype>,cn=config and must have the olcBackendConfig  objectClass.
       <databasetype>  should be one of bdb, config, dnssrv, hdb, ldap, ldif, mdb, meta, monitor,
       ndb, null, passwd, perl, relay, shell, or sql.  At  present,  no  backend  implements  any
       options of this type, so this entry should not be used.


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

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


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

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

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

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

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

       olcExtraAttrs: <attr>
              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.   <attr>  is  an  attribute
              that  is  needed  for internal purposes and thus always needs to be collected, even
              when not explicitly requested by clients.  This attribute is multi-valued.

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

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

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

              {CRYPT} uses the crypt(3).

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

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

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

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

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

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

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

       olcSizeLimit: {<integer>|unlimited}

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

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

       olcTimeLimit: {<integer>|unlimited}

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


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

       olcAddContentAcl: TRUE | FALSE
              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.

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

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

       olcLimits: <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>


                     <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  disable,  the  search  is  not  even
              performed;  this  can be used to disallow searches for a specific set of users.  If
              no limit specifier is set, the value is assigned to the soft limit,  and  the  hard
              limit is set to soft, to preserve the original behavior.

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

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

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

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

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

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

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

       olcSubordinate: [TRUE | FALSE | advertise]
              Specify that the current backend database  is  a  subordinate  of  another  backend
              database. A subordinate  database may have only one suffix. This option may be used
              to glue multiple databases into a single  namingContext.   If  the  suffix  of  the
              current  database  is  within  the  namingContext  of a superior database, searches
              against the superior database will be propagated to the subordinate as well. All of
              the databases associated with a single namingContext should have identical rootdns.
              Behavior of other LDAP operations is unaffected by this setting. In particular,  it
              is  not  possible  to  use  moddn  to move an entry from one subordinate to another
              subordinate within the 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 database. Its position on the database can  be  explicitly  configured  by
              setting   an  overlay  glue  directive  at  the  desired  position.  This  explicit
              configuration is necessary e.g.  when using the syncprov overlay,  which  needs  to
              follow glue in order to work over all of the glued databases. E.g.
                   dn: olcDatabase={1}bdb,cn=config
                   olcSuffix: dc=example,dc=com

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

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

       olcSuffix: <dn suffix>
              Specify  the  DN  suffix  of  queries that will be passed to this backend database.
              Multiple suffix lines can be given and at least one is required for  each  database

              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 olcSubordinate attribute.

       olcSyncUseSubentry: TRUE | FALSE
              Store  the  syncrepl  contextCSN  in a subentry instead of the context entry of the
              database. The subentry's RDN will be "cn=ldapsync". The default is  FALSE,  meaning
              the contextCSN is stored in the context entry.

       olcSyncrepl:  rid=<replica  ID>  provider=ldap[s]://<hostname>[:port] searchbase=<base DN>
              [type=refreshOnly|refreshAndPersist]     [interval=dd:hh:mm:ss]      [retry=[<retry
              interval>  <#  of  retries>]+]  [filter=<filter  str>]  [scope=sub|one|base|subord]
              [attrs=<attr   list>]   [exattrs=<attr   list>]   [attrsonly]   [sizelimit=<limit>]
              [timelimit=<limit>]       [schemachecking=on|off]       [network-timeout=<seconds>]
              [timeout=<seconds>]   [bindmethod=simple|sasl]   [binddn=<dn>]    [saslmech=<mech>]
              [authcid=<identity>]  [authzid=<identity>]  [credentials=<passwd>]  [realm=<realm>]
              [secprops=<properties>]                      [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_cipher_suite=<ciphers>]                           [tls_crlcheck=none|peer|all]
              [tls_protocol_min=<major>[.<minor>]] [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 having no more than 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

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

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

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

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

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

              The 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

              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.

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

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


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


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

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

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


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

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

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

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

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

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

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

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

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

       "OpenLDAP   Administrator's  Guide"  contains  a  longer  annotated  example  of  a  slapd

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


              default slapd configuration file

              default slapd configuration directory


       ldap(3),   ldif(5),   gnutls-cli(1),  slapd.access(5),  slapd.backends(5),  slapd.conf(5),
       slapd.overlays(5),  slapd.plugin(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.