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SLAPD-CONFIG(5)                        File Formats Manual                        SLAPD-CONFIG(5)

       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  con‐
       figuration 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  sup‐
       port  for  dynamically loaded modules. There can be multiple entries, one for each config‐
       ured 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 data‐
       base. 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  Configura‐
       tion  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 indi‐
       vidual 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 creden‐
              tials 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 (anony‐
              mous) 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 (pro‐
              gram 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 trail‐
              ing `-'.  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  olcAuthzReg‐
              exp  (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).   olcAu‐
              thIDRewrite 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  gen‐
              eral  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_for‐
              mat(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 attribute‐
              Type 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 con‐
              sequence, <pattern> is subjected to DN normalization.  Since the interpretation  of
              authzFrom and authzTo can impact security, users are strongly encouraged to explic‐
              itly 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); signif‐
              icantly, 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 expres‐
              sion, 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  num‐
              bered  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 accep‐
              tance of anonymous bind requests.  Note that this setting does not prohibit  anony‐
              mous  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 oper‐
              ation if authenticated (see also tls_2_anon).

       olcGentleHUP: { TRUE | FALSE }
              A SIGHUP signal will only cause a 'gentle' shutdown-attempt: Slapd will  stop  lis‐
              tening  for  new  connections,  but  will  not close the connections to the current
              clients.  Future write operations return unwilling-to-perform, though.  Slapd  ter‐
              minates  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 termi‐
              nate  the  server  and start a new slapd server with another database, without dis‐
              rupting 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 con‐
              nection.  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  pro‐
              vides 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 set‐
       tings 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  olc‐
              SaslSecProps'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 brack‐
              ets, 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 representa‐
              tion,  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  mes‐
              sages 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  encryp‐
              tion.   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 maxbuf‐
              size=<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 dig‐
              its).  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://ldap1.example.com
            olcServerID: 2 ldap://ldap2.example.com

       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 spec‐
              ified,  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  mini‐
              mum 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  --prior‐
              ity, 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 trans‐
              lated 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  Authori‐
              ties 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  olcTLSCACertificate‐
              File 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  olcTLSCACer‐
              tificatePath), 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 cer‐
              tificate  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

              When  using Mozilla NSS, olcTLSCertificateKeyFile specifies the name of a file that
              contains the password for the key for the certificate specified with olcTLSCertifi‐
              cateFile.   The modutil command can be used to turn off password protection for the
              cert/key database.  For example, if  olcTLSCACertificatePath  specifes  /etc/openl‐
              dap/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 certifi‐
              cate 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 RAND‐
              FILE 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 certifi‐
                     cate 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 ver‐
              ify if the client certificates have not been revoked.  This  requires  olcTLSCACer‐
              tificatePath 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  avail‐
       able.  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
              size.pr={<integer>|noEstimate|unlimited}, where integer is the max page size if  no
              explicit limit is set; the keyword noEstimate inhibits the server from returning an
              estimate of the total number of entries that might be returned (note:  the  current
              implementation does not return any estimate).  The keyword unlimited indicates that
              no  limit  is  applied  to  the  pagedResults  control  page  size.    The   syntax
              size.prtotal={<integer>|unlimited|disabled}  allows  to  set  a  limit on the total
              number of entries that a pagedResults control allows to return.  By default  it  is
              set  to  the  hard  limit.  When set, integer is the max number of entries that the
              whole search  with  pagedResults  control  can  return.   Use  unlimited  to  allow
              unlimited  number  of  entries  to  be  returned,  e.g.  to  allow  the  use of the
              pagedResults control as a means to circumvent size limitations on regular searches;
              the  keyword  disabled disables the control, i.e. no paged results can be returned.
              Note that the total number of entries returned when  the  pagedResults  control  is
              requested  cannot exceed the hard size limit of regular searches unless extended by
              the prtotal switch.

       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_ciphersuite=<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/slapd.pid
              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://ldap.some-server.com/

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

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

OpenLDAP                                    2014/09/20                            SLAPD-CONFIG(5)

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