Provided by: slapd_2.5.13+dfsg-1ubuntu1_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), slapmodify(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, only back-mdb implements any
       options of this type, so this setting is not needed for any other backends.

       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.   It consists of the keyword group,
              optionally  followed  by  the  specification   of   the   group   objectClass   and
              attributeType.   The  objectClass  defaults  to  groupOfNames.   The  attributeType
              defaults to member.  The group with DN  <pattern>  is  searched  with  base  scope,
              filtered  on  the specified objectClass.  The values of the resulting attributeType
              are searched for the asserted DN.

              The fifth form is provided 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, provided it results in exactly one
              entry, 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,  or  extracted  from  certificates  in case of cert-based SASL
              EXTERNAL, or provided within the RFC 4370 "proxied authorization"  control,  to  an
              LDAP DN used for authorization purposes.  Note that the resulting DN need not refer
              to an existing entry to be considered valid.   When  an  authorization  request  is
              received  from  the  SASL  subsystem,  the  SASL USERNAME, REALM, and MECHANISM are
              taken, when available, and combined into a name of the form


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


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


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


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

       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).
              proxy_authz_non_critical  disables  acceptance of the proxied authorization control
              (RFC4370)  with  criticality  set  to  FALSE.   dontusecopy_non_critical   disables
              acceptance  of the dontUseCopy control (a work in progress) with criticality set to

       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.

       olcIndexHash64: { on | off }
              Use  a 64 bit hash for indexing. The default is to use 32 bit hashes.  These hashes
              are used for equality and substring indexing. The 64 bit version may be  needed  to
              avoid index collisions when the number of indexed values exceeds ~64 million. (Note
              that substring indexing  generates  multiple  index  values  per  actual  attribute
              value.)   Indices  generated  with  32  bit hashes are incompatible with the 64 bit
              version, and vice versa.  Any  existing  databases  must  be  fully  reloaded  when
              changing this setting. This directive is only supported on 64 bit CPUs.

       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 slapd debug messages. By default these messages only
              go to stderr, are not recorded anywhere else, and are unrelated to messages exposed
              by  the  loglevel  configuration parameter. 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) connections, LDAP operations, results (recommended)
                     512    (0x200 stats2) stats2 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
              parenthesis, 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.

              Note that the packets, BER, and parse levels are only available as debug output  on
              stderr, and are not sent to syslog.

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

       olcMaxFilterDepth: <integer>
              Specify the maximum depth of nested filters in search  requests.   The  default  is

       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.

       olcSaslAuxpropsDontUseCopy: <attr> [...]
              Specify which attribute(s) should be subject to the don't use copy control. This is
              necessary for some SASL mechanisms such as OTP to work in a replicated environment.
              The attribute "cmusaslsecretOTP" is the default value.

       olcSaslAuxpropsDontUseCopyIgnore TRUE | FALSE
              Used     to    disable    replication    of    the    attribute(s)    defined    by
              olcSaslAuxpropsDontUseCopy and instead use a local value for  the  attribute.  This
              allows  the SASL mechanism to continue to work if the provider is offline. This can
              cause replication inconsistency. Defaults to FALSE.

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

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

       olcSaslCbinding: none | tls-unique | tls-endpoint
              Specify the channel-binding type, see also  LDAP_OPT_X_SASL_CBINDING.   Default  is

       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,
              128 allows RC4, Blowfish  and  other  similar  ciphers,  256  will  require  modern
              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

       olcServerID: <integer> [<URL>]
              Specify  an integer ID from 0 to 4095 for this server. The ID may also be specified
              as a hexadecimal ID by prefixing the value with "0x".  Non-zero  IDs  are  required
              when using multi-provider replication and each provider must have a unique non-zero
              ID. Note that this requirement also applies to separate providers 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,  which  is  only  valid for single provider
              replication.  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.

       olcThreadQueues: <integer>
              Specify the number of work queues to use for the primary thread pool.  The  default
              is  1  and  this is typically adequate for up to 8 CPU cores.  The value should not
              exceed the number of CPUs in the system.

       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 or GnuTLS).  Example:

                            olcTLSCipherSuite: HIGH:MEDIUM:+SSLv2

                            olcTLSCiphersuite: 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

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

       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

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

              When  using  OpenSSL  that  file  may  also  contain  any  number  of  intermediate
              certificates after the server certificate.

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

       olcTLSDHParamFile: <filename>
              This directive specifies the  file  that  contains  parameters  for  Diffie-Hellman
              ephemeral  key exchange.  This is required in order to use a DSA certificate on the
              server, or an RSA certificate missing the "key encipherment" key usage.  Note  that
              setting  this  option  may  also  enable  Anonymous Diffie-Hellman key exchanges in
              certain non-default cipher suites.  Anonymous key  exchanges  should  generally  be
              avoided since they provide no actual client or server authentication and provide no
              protection against man-in-the-middle attacks.  You should  append  "!ADH"  to  your
              cipher suites to ensure that these suites are not used.

       olcTLSECName: <name>
              Specify the name of the curve(s) to use for Elliptic curve Diffie-Hellman ephemeral
              key exchange.  This option is only used for OpenSSL.  This option is not used  with
              GnuTLS; the curves may be chosen in the GnuTLS ciphersuite specification.

       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

       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.
              <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


       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> [<arguments>...]
              Specify  the  name  of  a  dynamically  loadable  module to load and any additional
              arguments if supported by the module. 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.)

       olcLdapSyntaxes ( <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  one to use the olcLdapSyntaxes attribute 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 one 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.

       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 only back-mdb does.  The entry
       must be named  olcBackend=<databasetype>,cn=config  and  must  have  the  olcBackendConfig
       objectClass.   <databasetype> should be one of asyncmeta, config, dnssrv, ldap, ldif, mdb,
       meta, monitor, ndb, null, passwd, perl, relay, sock, sql, or wt.  At present,  only  back-
       mdb  implements  any  options of this type, so this entry should not be used for any other


       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  one  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}]=<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.   If  no  special  qualifiers  are
              specified,  both soft and hard limits are set.  Extra args can be added in the same
              value.  Additional qualifiers are available; see olcLimits for  an  explanation  of
              all 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. 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.

       olcLastBind: TRUE | FALSE
              Controls whether slapd will automatically maintain the pwdLastSuccess attribute for
              entries. By default, olcLastBind is FALSE.

       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 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 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>|hard|unlimited|disabled}  allows  one to set a limit on the
              total number of entries that the pagedResults control will return.  By  default  it
              is  set to the hard limit which will use the size.hard value.  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 olcLimits 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 olcSyncrepl for details).

              When  using  subordinate  databases,  it is necessary for any limits that are to be
              applied across the parent and its subordinates to be defined in both the parent and
              its  subordinates.  Otherwise  the  settings  on  the subordinate databases are not

       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.

       olcMultiProvider: TRUE | FALSE
              This  option  puts a consumer database into Multi-Provider 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 olcServerID (see above) to be configured.  By default, this  setting  is

       olcMonitoring: TRUE | FALSE
              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 MDB database provides
              database-specific monitoring.   If  monitoring  is  supported  by  the  backend  it
              defaults to TRUE, otherwise FALSE.

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

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

       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), slapmodify(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}mdb,cn=config
                   olcSuffix: dc=example,dc=com

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

                   dn: olcOverlay={1}syncprov,olcDatabase={1}mdb,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>]   [tcp-user-timeout=<milliseconds>]    [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_reqsan=never|allow|try|demand]
              [tls_cipher_suite=<ciphers>]   [tls_ecname=<names>]    [tls_crlcheck=none|peer|all]
              [tls_protocol_min=<major>[.<minor>]]  [suffixmassage=<real DN>] [logbase=<base DN>]
              [logfilter=<filter str>] [syncdata=default|accesslog|changelog] [lazycommit]
              Specify the current database as a  consumer  which  is  kept  up-to-date  with  the
              provider  content  by  establishing  the current slapd(8) as a replication consumer
              site  running  a  syncrepl  replication  engine.   The  consumer  content  is  kept
              synchronized  to  the  provider  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

              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

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

              The content of the syncrepl consumer 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".  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; these should be left unchanged from the  default  otherwise  replication
              may   never  succeed.   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 provider will generate searchResultEntry to the consumer slapd as the search
              responses to the persistent synchronization search. If the initial search fails due
              to  an error, the next synchronization search operation is periodically rescheduled
              at an interval time (specified by interval parameter; 1 day by default)

              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 is 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).   The
              tcp-user-timeout parameter, if non-zero, corresponds to the TCP_USER_TIMEOUT set on
              the target connections, overriding the operating system setting.  Only some systems
              support  the  customization  of this parameter, it is ignored otherwise and system-
              wide settings are used.

              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 allowing 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

              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",  the  tls_reqsan  setting defaults to "allow", and the other TLS settings
              default to the same as the main slapd TLS settings.

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

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

              The  lazycommit  parameter  tells the underlying database that it can store changes
              without performing a full flush after each change. This may improve performance for
              the consumer, while sacrificing safety or durability.

       olcUpdateDN: <dn>
              This  option  is  only  applicable  in  a  replica  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 provider.

       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=mdb,cn=config
              objectClass: olcDatabaseConfig
              objectClass: olcMdbConfig
              olcDatabase: mdb
              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), slapmodify(8), slappasswd(8), slaptest(8).

       "OpenLDAP Administrator's Guide" (


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