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.TH SLAPD-CONFIG 5 "RELEASEDATE" "OpenLDAP LDVERSION"
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.\" Copyright 1998-2020 The OpenLDAP Foundation All Rights Reserved.
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.\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
.\" $OpenLDAP$
.SH NAME
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slapd\-config \- configuration backend to slapd
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.SH SYNOPSIS
ETCDIR/slapd.d
.SH DESCRIPTION
The
.B config
backend manages all of the configuration information for the
.BR slapd (8)
daemon.  This configuration information is also used by the SLAPD tools
.BR slapacl (8),
.BR slapadd (8),
.BR slapauth (8),
.BR slapcat (8),
.BR slapdn (8),
.BR slapindex (8),
and
.BR slaptest (8).
.LP
The
.B config
backend is backward compatible with the older
.BR slapd.conf (5)
file but provides the ability to change the configuration dynamically
at runtime. If slapd is run with only a
.B 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
.B slapd.d
configuration directory.
.LP

Unlike other backends, there can only be one instance of the
.B config
backend, and most of its structure is predefined. The root of the
database is hardcoded to
.B "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:
.RS
.TP
.B cn=Module
dynamically loaded modules
.TP
.B cn=Schema
schema definitions
.TP
.B olcBackend=xxx
backend-specific settings
.TP
.B olcDatabase=xxx
database-specific settings
.RE

The
.B 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
.B 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
.BR cn=core,cn=schema,cn=config .

.B 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.

.B olcDatabase
entries store settings specific to a single database
instance. These entries may have
.B 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
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that are predefined \- one is an entry for the config database itself,
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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.
.LP
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
.B 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
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items to be specified on one line, separated by whitespace, will allow
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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
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.B slapd\-<backend>(5)
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manual pages.  Refer to the "OpenLDAP Administrator's Guide" for more
details on configuring slapd.
.SH GLOBAL CONFIGURATION OPTIONS
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
.B cn=config
entry. This entry must have an objectClass of
.BR olcGlobal .

.TP
.B olcAllows: <features>
Specify a set of features to allow (default none).
.B bind_v2
allows acceptance of LDAPv2 bind requests.  Note that
.BR slapd (8)
does not truly implement LDAPv2 (RFC 1777), now Historic (RFC 3494).
.B bind_anon_cred
allows anonymous bind when credentials are not empty (e.g.
when DN is empty).
.B bind_anon_dn
allows unauthenticated (anonymous) bind when DN is not empty.
.B update_anon
allows unauthenticated (anonymous) update operations to be processed
(subject to access controls and other administrative limits).
.B proxy_authz_anon
allows unauthenticated (anonymous) proxy authorization control to be processed
(subject to access controls, authorization and other administrative limits).
.TP
.B olcArgsFile: <filename>
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The (absolute) name of a file that will hold the 
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.B slapd
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server's command line (program name and options).
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.TP
.B olcAttributeOptions: <option-name>...
Define tagging attribute options or option tag/range prefixes.
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Options must not end with `\-', prefixes must end with `\-'.
The `lang\-' prefix is predefined.
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If you use the
.B olcAttributeOptions
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directive, `lang\-' will no longer be defined and you must specify it
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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.
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Prefixes defined this way work like the `lang\-' options:
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They define a prefix for tagging options starting with the prefix.
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That is, if you define the prefix `x\-foo\-', you can use the option
`x\-foo\-bar'.
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Furthermore, in a search or compare, a prefix or range name (with
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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'.
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RFC 4520 reserves options beginning with `x\-' for private experiments.
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Other options should be registered with IANA, see RFC 4520 section 3.5.
OpenLDAP also has the `binary' option built in, but this is a transfer
option, not a tagging option.
.TP
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.B 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
.BR olcAuthzRegexp
(see below).
The
.B rewrite\-rule
is a set of rules analogous to those described in
.BR slapo\-rwm (5)
for data rewriting (after stripping the \fIrwm\-\fP prefix).
.B olcAuthIDRewrite
and
.B olcAuthzRegexp
should not be intermixed.
.TP
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.B 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
.B none
flag disables proxy authorization. This is the default setting.
The
.B from
flag will use rules in the
.I authzFrom
attribute of the authorization DN.
The
.B to
flag will use rules in the
.I authzTo
attribute of the authentication DN.
The
.B any
flag, an alias for the deprecated value of
.BR both ,
will allow any of the above, whatever succeeds first (checked in
.BR to ,
.B from
sequence.
The
.B all
flag requires both authorizations to succeed.
.LP
.RS
The rules are mechanisms to specify which identities are allowed 
to perform proxy authorization.
The
.I authzFrom
attribute in an entry specifies which other users
are allowed to proxy login to this entry. The
.I authzTo
attribute in
an entry specifies which other users this user can authorize as.  Use of
.I authzTo
rules can be easily
abused if users are allowed to write arbitrary values to this attribute.
In general the
.I authzTo
attribute must be protected with ACLs such that
only privileged users can modify it.
The value of
.I authzFrom
and
.I authzTo
describes an 
.B identity 
or a set of identities; it can take five forms:
.RS
.TP
.B ldap:///<base>??[<scope>]?<filter>
.RE
.RS
.B dn[.<dnstyle>]:<pattern>
.RE
.RS
.B u[<mech>[<realm>]]:<pattern>
.RE
.RS
.B group[/objectClass[/attributeType]]:<pattern>
.RE
.RS
.B <pattern>
.RE
.RS

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

.RE
The first form is a valid LDAP
.B URI
where the 
.IR <host>:<port> ,
the
.I <attrs>
and the
.I <extensions>
portions must be absent, so that the search occurs locally on either
.I authzFrom
or 
.IR authzTo .
The second form is a 
.BR DN ,
with the optional style modifiers
.IR exact ,
.IR onelevel ,
.IR children ,
and
.I subtree
for exact, onelevel, children and subtree matches, which cause 
.I <pattern>
to be normalized according to the DN normalization rules, or the special
.I regex
style, which causes the
.I <pattern>
to be treated as a POSIX (''extended'') regular expression, as
discussed in
.BR regex (7)
and/or
.BR re_format (7).
A pattern of
.I *
means any non-anonymous DN.
The third form is a SASL
.BR id ,
with the optional fields
.I <mech>
and
.I <realm>
that allow to specify a SASL
.BR mechanism ,
and eventually a SASL
.BR 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
.BR group ,
optionally followed by the specification of the group
.B objectClass
and member
.BR attributeType .
The group with DN
.B <pattern>
is searched with base scope, and in case of match, the values of the
member
.B attributeType
are searched for the asserted DN.
For backwards compatibility, if no identity type is provided, i.e. only
.B <pattern>
is present, an
.I exact DN
is assumed; as a consequence, 
.B <pattern>
is subjected to DN normalization.
Since the interpretation of
.I authzFrom
and
.I 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 
.B olcAuthzRegexp
statement (see below); significantly, the 
.I URI
and the
.I dn.exact:<dn> 
forms.
.RE
.TP
.B 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 
.BR USERNAME ,
.BR REALM , 
and
.B MECHANISM
are taken, when available, and combined into a name of the form
.RS
.RS
.TP
.B UID=<username>[[,CN=<realm>],CN=<mechanism>],CN=auth

.RE
This name is then compared against the
.B match
POSIX (''extended'') regular expression, and if the match is successful,
the name is replaced with the
.B replace
string.  If there are wildcard strings in the 
.B match
regular expression that are enclosed in parenthesis, e.g. 
.RS
.TP
.B UID=([^,]*),CN=.*

.RE
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 
.B replace
string, e.g. 
.RS
.TP
.B UID=$1,OU=Accounts,DC=example,DC=com 

.RE
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.
.RS
.TP
.B ldap:///OU=Accounts,DC=example,DC=com??one?(UID=$1)

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

Multiple 
.B olcAuthzRegexp 
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values can be specified to allow for multiple matching 
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and replacement patterns. The matching patterns are checked in the order they 
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appear in the attribute, stopping at the first successful match.
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.\".B Caution:
.\"Because the plus sign + is a character recognized by the regular expression engine,
.\"and it will appear in names that include a REALM, be careful to escape the
.\"plus sign with a backslash \\+ to remove the character's special meaning.
.RE
.TP
.B 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.
.TP
.B 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 100.
.TP
.B olcConnMaxPendingAuth: <integer>
Specify the maximum number of pending requests for an authenticated session.
The default is 1000.
.TP
.B olcDisallows: <features>
Specify a set of features to disallow (default none).
.B bind_anon
disables acceptance of anonymous bind requests.  Note that this setting
does not prohibit anonymous directory access (See "require authc").
.B bind_simple
disables simple (bind) authentication.
.B tls_2_anon
disables forcing session to anonymous status (see also
.BR tls_authc )
upon StartTLS operation receipt.
.B tls_authc
disallows the StartTLS operation if authenticated (see also
.BR tls_2_anon ).
.TP
.B olcGentleHUP: { TRUE | FALSE }
A SIGHUP signal will only cause a 'gentle' shutdown-attempt:
.B 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
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have closed their connections (if they ever do), or \- as before \-
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if it receives a SIGTERM signal.  This can be useful if you wish to
terminate the server and start a new
.B slapd
server
.B with another database,
without disrupting the currently active clients.
The default is FALSE.  You may wish to use
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.B olcIdleTimeout
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along with this option.
.TP
.B olcIdleTimeout: <integer>
Specify the number of seconds to wait before forcibly closing
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an idle client connection.  A setting of 0 disables this
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feature.  The default is 0. You may also want to set the
.B olcWriteTimeout
option.
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.TP
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.B 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.
.TP
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.B olcIndexIntLen: <integer>
Specify the key length for ordered integer indices. The most significant
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bytes of the binary integer will be used for index keys. The default
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value is 4, which provides exact indexing for 31 bit values.
A floating point representation is used to index too large values.
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.TP
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.B 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.
.TP
.B 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.
.TP
.B 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
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.I olcIndexSubstrIfMaxlen
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value.
.TP
.B 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".

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.LP
Note: Indexing support depends on the particular backend in use. Also,
changing these settings will generally require deleting any indices that
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depend on these parameters and recreating them with
.BR slapindex (8).
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.TP
.B 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.
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.TP
.B 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 
.BR olcSaslSecProps 's
.B minssf
option description.  The default is 71.
.TP
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.B olcLogFile: <filename>
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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.
.TP
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.B olcLogLevel: <integer> [...]
Specify the level at which debugging statements and operation 
statistics should be syslogged (currently logged to the
.BR syslogd (8) 
LOG_LOCAL4 facility).
They must be considered subsystems rather than increasingly verbose 
log levels.
Some messages with higher priority are logged regardless 
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of the configured loglevel as soon as any logging is configured.
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Log levels are additive, and available levels are:
.RS
.RS
.PD 0
.TP
.B 1
.B (0x1 trace)
trace function calls
.TP
.B 2
.B (0x2 packets)
debug packet handling
.TP
.B 4
.B (0x4 args)
heavy trace debugging (function args)
.TP
.B 8
.B (0x8 conns)
connection management
.TP
.B 16
.B (0x10 BER)
print out packets sent and received
.TP
.B 32
.B (0x20 filter)
search filter processing
.TP
.B 64
.B (0x40 config)
configuration file processing
.TP
.B 128
.B (0x80 ACL)
access control list processing
.TP
.B 256
.B (0x100 stats)
stats log connections/operations/results
.TP
.B 512
.B (0x200 stats2)
stats log entries sent
.TP
.B 1024
.B (0x400 shell)
print communication with shell backends
.TP
.B 2048
.B (0x800 parse)
entry parsing
\".TP
\".B 4096
\".B (0x1000 cache)
\"caching (unused)
\".TP
\".B 8192
\".B (0x2000 index)
\"data indexing (unused)
.TP
.B 16384
.B (0x4000 sync)
LDAPSync replication
.TP
.B 32768
.B (0x8000 none)
only messages that get logged whatever log level is set
.PD
.RE
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),
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or as a list of the names that are shown between parenthesis, such that
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.LP
.nf
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    olcLogLevel: 129
    olcLogLevel: 0x81
    olcLogLevel: 128 1
    olcLogLevel: 0x80 0x1
    olcLogLevel: acl trace
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.fi
.LP
are equivalent.
The keyword 
.B any
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can be used as a shortcut to enable logging at all levels (equivalent to \-1).
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The keyword
.BR none ,
or the equivalent integer representation, causes those messages
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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, 
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so at least the 
.B none
level is required to have high priority messages logged.
.RE
.TP
.B olcPasswordCryptSaltFormat: <format>
Specify the format of the salt passed to
.BR crypt (3)
when generating {CRYPT} passwords (see
.BR olcPasswordHash )
during processing of LDAP Password Modify Extended Operations (RFC 3062).

This string needs to be in
.BR sprintf (3)
format and may include one (and only one) %s conversion.
This conversion will be substituted with a string of random
characters from [A\-Za\-z0\-9./].  For example, "%.2s"
provides a two character salt and "$1$%.8s" tells some
versions of crypt(3) to use an MD5 algorithm and provides
8 random characters of salt.  The default is "%s", which
provides 31 characters of salt.
.TP
.B olcPidFile: <filename>
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The (absolute) name of a file that will hold the 
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.B slapd
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server's process ID (see
.BR getpid (2)).
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.TP
.B olcPluginLogFile: <filename>
The ( absolute ) name of a file that will contain log
messages from
.B SLAPI
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plugins. See
.BR slapd.plugin (5)
for details.
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.TP
.B olcReferral: <url>
Specify the referral to pass back when
.BR slapd (8)
cannot find a local database to handle a request.
If multiple values are specified, each url is provided.
.TP
.B olcReverseLookup: TRUE | FALSE
Enable/disable client name unverified reverse lookup (default is 
.BR FALSE 
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if compiled with \-\-enable\-rlookups).
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.TP
.B 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.
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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.:
.ti +4
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ldapsearch \-x \-b "" \-s base "+"
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.br
See RFC 4512 section 5.1 for details.
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.TP
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.B olcSaslAuxprops: <plugin> [...]
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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.
.TP
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.B 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.
.TP
.B 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 master is offline. This can
cause replication inconsistency. Defaults to FALSE.
.TP
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.B olcSaslHost: <fqdn>
Used to specify the fully qualified domain name used for SASL processing.
.TP
.B olcSaslRealm: <realm>
Specify SASL realm.  Default is empty.
.TP
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.B olcSaslCbinding: none | tls-unique | tls-endpoint
Specify the channel-binding type, see also LDAP_OPT_X_SASL_CBINDING.
Default is none.
.TP
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.B olcSaslSecProps: <properties>
Used to specify Cyrus SASL security properties.
The
.B none
flag (without any other properties) causes the flag properties
default, "noanonymous,noplain", to be cleared.
The
.B noplain
flag disables mechanisms susceptible to simple passive attacks.
The
.B noactive
flag disables mechanisms susceptible to active attacks.
The
.B nodict
flag disables mechanisms susceptible to passive dictionary attacks.
The
.B noanonymous
flag disables mechanisms which support anonymous login.
The
.B forwardsec
flag require forward secrecy between sessions.
The
.B passcred
require mechanisms which pass client credentials (and allow
mechanisms which can pass credentials to do so).
The
.B minssf=<factor> 
property specifies the minimum acceptable
.I security strength factor
as an integer approximate to effective key length used for
encryption.  0 (zero) implies no protection, 1 implies integrity
protection only, 56 allows DES or other weak ciphers, 112
allows triple DES and other strong ciphers, 128 allows RC4,
Blowfish and other modern strong ciphers.  The default is 0.
The
.B maxssf=<factor> 
property specifies the maximum acceptable
.I security strength factor
as an integer (see minssf description).  The default is INT_MAX.
The
.B maxbufsize=<size> 
property specifies the maximum security layer receive buffer
size allowed.  0 disables security layers.  The default is 65536.
.TP
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.B olcServerID: <integer> [<URL>]
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Specify an integer ID from 0 to 4095 for this server (limited
to 3 hexadecimal digits).  The ID may also be specified as a
hexadecimal ID by prefixing the value with "0x".
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Non-zero IDs are
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required when using multimaster replication and each master must have a
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unique non-zero ID. Note that this requirement also applies to separate masters
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contributing to a glued set of databases.
If the URL is provided, this directive may be specified
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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
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of all CSNs generated by the specified server. The default value is zero, which
is only valid for single master replication.
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Example:
.LP
.nf
	olcServerID: 1 ldap://ldap1.example.com
	olcServerID: 2 ldap://ldap2.example.com
.fi
.TP
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.B olcSockbufMaxIncoming: <integer>
Specify the maximum incoming LDAP PDU size for anonymous sessions.
The default is 262143.
.TP
.B olcSockbufMaxIncomingAuth: <integer>
Specify the maximum incoming LDAP PDU size for authenticated sessions.
The default is 4194303.
.TP
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.B 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
.BR tcp (7)
for details.
Note that some OS-es implement automatic TCP buffer tuning.
.TP
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.B olcThreads: <integer>
Specify the maximum size of the primary thread pool.
The default is 16; the minimum value is 2.
.TP
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.B 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.
.TP
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.B 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.
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.TP
.B 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.
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.SH TLS OPTIONS
If
.B slapd
is built with support for Transport Layer Security, there are more options
you can specify.
.TP
.B olcTLSCipherSuite: <cipher-suite-spec>
Permits configuring what ciphers will be accepted and the preference order.
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<cipher-suite-spec> should be a cipher specification for
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the TLS library in use (OpenSSL or GnuTLS).
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Example:
.RS
.RS
.TP
.I OpenSSL:
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olcTLSCipherSuite: HIGH:MEDIUM:+SSLv2
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.TP
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.I GnuTLS:
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olcTLSCiphersuite: SECURE256:!AES-128-CBC
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.RE
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To check what ciphers a given spec selects in OpenSSL, use:
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.nf
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	openssl ciphers \-v <cipher-suite-spec>
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.fi

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

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In older versions of GnuTLS, where gnutls\-cli does not support the option
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\-\-priority, you can obtain the \(em more limited \(em list of ciphers by calling:
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.nf
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	gnutls\-cli \-l
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.fi
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.RE
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.TP
.B olcTLSCACertificateFile: <filename>
Specifies the file that contains certificates for all of the Certificate
Authorities that
.B slapd
will recognize.
.TP
.B olcTLSCACertificatePath: <path>
Specifies the path of a directory that contains Certificate Authority
certificates in separate individual files. Usually only one of this
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.TP
.B olcTLSCertificateFile: <filename>
Specifies the file that contains the
.B slapd
server certificate.
.TP
.B olcTLSCertificateKeyFile: <filename>
Specifies the file that contains the
.B slapd
server private key that matches the certificate stored in the
.B olcTLSCertificateFile
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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. 
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.TP
.B 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
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the server, or an RSA certificate missing the "key encipherment" key usage.
Note that setting this option may also enable
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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.
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.TP
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.B olcTLSECName: <name>
Specify the name of a curve to use for Elliptic curve Diffie-Hellman
ephemeral key exchange.  This is required to enable ECDHE algorithms in
OpenSSL.  This option is not used with GnuTLS; the curves may be
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.TP
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.B 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.,

.nf
	olcTLSProtocolMin: 3.2
.fi

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.
.TP
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.B 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.
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This directive is ignored with GnuTLS.
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.TP
.B olcTLSVerifyClient: <level>
Specifies what checks to perform on client certificates in an
incoming TLS session, if any.
The
.B <level>
can be specified as one of the following keywords:
.RS
.TP
.B never
This is the default.
.B slapd
will not ask the client for a certificate.
.TP
.B 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.
.TP
.B 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.
.TP
.B 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
.B olcTLSVerifyClient
setting must be chosen to enable SASL EXTERNAL authentication.
.RE
.TP
.B 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
.B olcTLSCACertificatePath
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.B <level>
can be specified as one of the following keywords:
.RS
.TP
.B none
No CRL checks are performed
.TP
.B peer
Check the CRL of the peer certificate
.TP
.B all
Check the CRL for a whole certificate chain
.RE
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.TP
.B olcTLSCRLFile: <filename>
Specifies a file containing a Certificate Revocation List to be used
for verifying that certificates have not been revoked. This parameter
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is only valid when using GnuTLS.
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.SH DYNAMIC MODULE OPTIONS
If
.B slapd