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SLAPD-CONFIG(5) File Formats Manual SLAPD-CONFIG(5)
slapd-config - configuration backend to slapd
ETCDIR/slapd.d
The config backend manages all of the configuration information
for the slapd(8) daemon. This configuration information is also
used by the SLAPD tools slapacl(8), slapadd(8), slapauth(8),
slapcat(8), slapdn(8), slapindex(8), slapmodify(8), and
slaptest(8).
The config backend is backward compatible with the older
slapd.conf(5) file but provides the ability to change the
configuration dynamically at runtime. If slapd is run with only a
slapd.conf file dynamic changes will be allowed but they will not
persist across a server restart. Dynamic changes are only saved
when slapd is running from a slapd.d configuration directory.
Unlike other backends, there can only be one instance of the
config backend, and most of its structure is predefined. The root
of the database is hardcoded to cn=config and this root entry
contains global settings for slapd. Multiple child entries
underneath the root entry are used to carry various other
settings:
cn=Module
dynamically loaded modules
cn=Schema
schema definitions
olcBackend=xxx
backend-specific settings
olcDatabase=xxx
database-specific settings
The cn=Module entries will only appear in configurations where
slapd was built with support for dynamically loaded modules. There
can be multiple entries, one for each configured module path.
Within each entry there will be values recorded for each module
loaded on a given path. These entries have no children.
The cn=Schema entry contains all of the hardcoded schema elements.
The children of this entry contain all user-defined schema
elements. In schema that were loaded from include files, the
child entry will be named after the include file from which the
schema was loaded. Typically the first child in this subtree will
be cn=core,cn=schema,cn=config.
olcBackend entries are for storing settings specific to a single
backend type (and thus global to all database instances of that
type). At present, only back-mdb implements any options of this
type, so this setting is not needed for any other backends.
olcDatabase entries store settings specific to a single database
instance. These entries may have olcOverlay child entries
corresponding to any overlays configured on the database. The
olcDatabase and olcOverlay entries may also have miscellaneous
child entries for other settings as needed. There are two special
database entries that are predefined - one is an entry for the
config database itself, and the other is for the "frontend"
database. Settings in the frontend database are inherited by the
other databases, unless they are explicitly overridden in a
specific database.
The specific configuration options available are discussed below
in the Global Configuration Options, General Backend Options, and
General Database Options. Options are set by defining LDAP
attributes with specific values. In general the names of the LDAP
attributes are the same as the corresponding slapd.conf keyword,
with an "olc" prefix added on.
The parser for many of these attributes is the same as used for
parsing the slapd.conf keywords. As such, slapd.conf keywords that
allow multiple items to be specified on one line, separated by
whitespace, will allow multiple items to be specified in one
attribute value. However, when reading the attribute via LDAP, the
items will be returned as individual attribute values.
Backend-specific options are discussed in the slapd-<backend>(5)
manual pages. Refer to the "OpenLDAP Administrator's Guide" for
more details on configuring slapd.
Options described in this section apply to the server as a whole.
Arguments that should be replaced by actual text are shown in
brackets <>.
These options may only be specified in the cn=config entry. This
entry must have an objectClass of olcGlobal.
olcAllows: <features>
Specify a set of features to allow (default none). bind_v2
allows acceptance of LDAPv2 bind requests. Note that
slapd(8) does not truly implement LDAPv2 (RFC 1777), now
Historic (RFC 3494). bind_anon_cred allows anonymous bind
when credentials are not empty (e.g. when DN is empty).
bind_anon_dn allows unauthenticated (anonymous) bind when
DN is not empty. update_anon allows unauthenticated
(anonymous) update operations to be processed (subject to
access controls and other administrative limits).
proxy_authz_anon allows unauthenticated (anonymous) proxy
authorization control to be processed (subject to access
controls, authorization and other administrative limits).
olcArgsFile: <filename>
The (absolute) name of a file that will hold the slapd
server's command line (program name and options).
olcAttributeOptions: <option-name>...
Define tagging attribute options or option tag/range
prefixes. Options must not end with `-', prefixes must end
with `-'. The `lang-' prefix is predefined. If you use
the olcAttributeOptions directive, `lang-' will no longer
be defined and you must specify it explicitly if you want
it defined.
An attribute description with a tagging option is a subtype
of that attribute description without the option. Except
for that, options defined this way have no special
semantics. Prefixes defined this way work like the `lang-'
options: They define a prefix for tagging options starting
with the prefix. That is, if you define the prefix
`x-foo-', you can use the option `x-foo-bar'. Furthermore,
in a search or compare, a prefix or range name (with a
trailing `-') matches all options starting with that name,
as well as the option with the range name sans the trailing
`-'. That is, `x-foo-bar-' matches `x-foo-bar' and
`x-foo-bar-baz'.
RFC 4520 reserves options beginning with `x-' for private
experiments. Other options should be registered with IANA,
see RFC 4520 section 3.5. OpenLDAP also has the `binary'
option built in, but this is a transfer option, not a
tagging option.
olcAuthIDRewrite: <rewrite-rule>
Used by the authentication framework to convert simple user
names to an LDAP DN used for authorization purposes. Its
purpose is analogous to that of olcAuthzRegexp (see below).
The rewrite-rule is a set of rules analogous to those
described in slapo-rwm(5) for data rewriting (after
stripping the rwm- prefix). olcAuthIDRewrite and
olcAuthzRegexp should not be intermixed.
olcAuthzPolicy: <policy>
Used to specify which rules to use for Proxy Authorization.
Proxy authorization allows a client to authenticate to the
server using one user's credentials, but specify a
different identity to use for authorization and access
control purposes. It essentially allows user A to login as
user B, using user A's password. The none flag disables
proxy authorization. This is the default setting. The from
flag will use rules in the authzFrom attribute of the
authorization DN. The to flag will use rules in the
authzTo attribute of the authentication DN. The any flag,
an alias for the deprecated value of both, will allow any
of the above, whatever succeeds first (checked in to, from
sequence. The all flag requires both authorizations to
succeed.
The rules are mechanisms to specify which identities are
allowed to perform proxy authorization. The authzFrom
attribute in an entry specifies which other users are
allowed to proxy login to this entry. The authzTo attribute
in an entry specifies which other users this user can
authorize as. Use of authzTo rules can be easily abused if
users are allowed to write arbitrary values to this
attribute. In general the authzTo attribute must be
protected with ACLs such that only privileged users can
modify it. The value of authzFrom and authzTo describes an
identity or a set of identities; it can take five forms:
ldap:///<base>??[<scope>]?<filter>
dn[.<dnstyle>]:<pattern>
u[.<mech>[<realm>]]:<pattern>
group[/objectClass[/attributeType]]:<pattern>
<pattern>
<dnstyle>:={exact|onelevel|children|subtree|regex}
The first form is a valid LDAP URI where the <host>:<port>,
the <attrs> and the <extensions> portions must be absent,
so that the search occurs locally on either authzFrom or
authzTo.
The second form is a DN, with the optional style modifiers
exact, onelevel, children, and subtree for exact, onelevel,
children and subtree matches, which cause <pattern> to be
normalized according to the DN normalization rules, or the
special regex style, which causes the <pattern> to be
treated as a POSIX (''extended'') regular expression, as
discussed in regex(7) and/or re_format(7). A pattern of *
means any non-anonymous DN.
The third form is a SASL id, with the optional fields
<mech> and <realm> that allow to specify a SASL mechanism,
and eventually a SASL realm, for those mechanisms that
support one. The need to allow the specification of a
mechanism is still debated, and users are strongly
discouraged to rely on this possibility.
The fourth form is a group specification. It consists of
the keyword group, optionally followed by the specification
of the group objectClass and attributeType. The
objectClass defaults to groupOfNames. The attributeType
defaults to member. The group with DN <pattern> is
searched with base scope, filtered on the specified
objectClass. The values of the resulting attributeType are
searched for the asserted DN.
The fifth form is provided for backwards compatibility. If
no identity type is provided, i.e. only <pattern> is
present, an exact DN is assumed; as a consequence,
<pattern> is subjected to DN normalization.
Since the interpretation of authzFrom and authzTo can
impact security, users are strongly encouraged to
explicitly set the type of identity specification that is
being used. A subset of these rules can be used as third
arg in the olcAuthzRegexp statement (see below);
significantly, the URI, provided it results in exactly one
entry, and the dn.exact:<dn> forms.
olcAuthzRegexp: <match> <replace>
Used by the authentication framework to convert simple user
names, such as provided by SASL subsystem, or extracted
from certificates in case of cert-based SASL EXTERNAL, or
provided within the RFC 4370 "proxied authorization"
control, to an LDAP DN used for authorization purposes.
Note that the resulting DN need not refer to an existing
entry to be considered valid. When an authorization
request is received from the SASL subsystem, the SASL
USERNAME, REALM, and MECHANISM are taken, when available,
and combined into a name of the form
UID=<username>[[,CN=<realm>],CN=<mechanism>],CN=auth
This name is then compared against the match POSIX
(''extended'') regular expression, and if the match is
successful, the name is replaced with the replace string.
If there are wildcard strings in the match regular
expression that are enclosed in parenthesis, e.g.
UID=([^,]*),CN=.*
then the portion of the name that matched the wildcard will
be stored in the numbered placeholder variable $1. If there
are other wildcard strings in parenthesis, the matching
strings will be in $2, $3, etc. up to $9. The placeholders
can then be used in the replace string, e.g.
UID=$1,OU=Accounts,DC=example,DC=com
The replaced name can be either a DN, i.e. a string
prefixed by "dn:", or an LDAP URI. If the latter, the
server will use the URI to search its own database(s) and,
if the search returns exactly one entry, the name is
replaced by the DN of that entry. The LDAP URI must have
no hostport, attrs, or extensions components, but the
filter is mandatory, e.g.
ldap:///OU=Accounts,DC=example,DC=com??one?(UID=$1)
The protocol portion of the URI must be strictly ldap.
Note that this search is subject to access controls.
Specifically, the authentication identity must have "auth"
access in the subject.
Multiple olcAuthzRegexp values can be specified to allow
for multiple matching and replacement patterns. The
matching patterns are checked in the order they appear in
the attribute, stopping at the first successful match.
olcConcurrency: <integer>
Specify a desired level of concurrency. Provided to the
underlying thread system as a hint. The default is not to
provide any hint. This setting is only meaningful on some
platforms where there is not a one to one correspondence
between user threads and kernel threads.
olcConnMaxPending: <integer>
Specify the maximum number of pending requests for an
anonymous session. If requests are submitted faster than
the server can process them, they will be queued up to this
limit. If the limit is exceeded, the session is closed. The
default is 100.
olcConnMaxPendingAuth: <integer>
Specify the maximum number of pending requests for an
authenticated session. The default is 1000.
olcDisallows: <features>
Specify a set of features to disallow (default none).
bind_anon disables acceptance of anonymous bind requests.
Note that this setting does not prohibit anonymous
directory access (See "require authc"). bind_simple
disables simple (bind) authentication. tls_2_anon disables
forcing session to anonymous status (see also tls_authc)
upon StartTLS operation receipt. tls_authc disallows the
StartTLS operation if authenticated (see also tls_2_anon).
proxy_authz_non_critical disables acceptance of the proxied
authorization control (RFC4370) with criticality set to
FALSE. dontusecopy_non_critical disables acceptance of the
dontUseCopy control (a work in progress) with criticality
set to FALSE.
olcGentleHUP: { TRUE | FALSE }
A SIGHUP signal will only cause a 'gentle' shutdown-
attempt: Slapd will stop listening for new connections, but
will not close the connections to the current clients.
Future write operations return unwilling-to-perform,
though. Slapd terminates when all clients have closed
their connections (if they ever do), or - as before - if it
receives a SIGTERM signal. This can be useful if you wish
to terminate the server and start a new slapd server with
another database, without disrupting the currently active
clients. The default is FALSE. You may wish to use
olcIdleTimeout along with this option.
olcIdleTimeout: <integer>
Specify the number of seconds to wait before forcibly
closing an idle client connection. A setting of 0 disables
this feature. The default is 0. You may also want to set
the olcWriteTimeout option.
olcIndexHash64: { TRUE | FALSE }
Use a 64 bit hash for indexing. The default is to use 32
bit hashes. These hashes are used for equality and
substring indexing. The 64 bit version may be needed to
avoid index collisions when the number of indexed values
exceeds ~64 million. (Note that substring indexing
generates multiple index values per actual attribute
value.) Indices generated with 32 bit hashes are
incompatible with the 64 bit version, and vice versa. Any
existing databases must be fully reloaded when changing
this setting. This directive is only supported on 64 bit
CPUs.
olcIndexIntLen: <integer>
Specify the key length for ordered integer indices. The
most significant bytes of the binary integer will be used
for index keys. The default value is 4, which provides
exact indexing for 31 bit values. A floating point
representation is used to index too large values.
olcIndexSubstrIfMaxlen: <integer>
Specify the maximum length for subinitial and subfinal
indices. Only this many characters of an attribute value
will be processed by the indexing functions; any excess
characters are ignored. The default is 4.
olcIndexSubstrIfMinlen: <integer>
Specify the minimum length for subinitial and subfinal
indices. An attribute value must have at least this many
characters in order to be processed by the indexing
functions. The default is 2.
olcIndexSubstrAnyLen: <integer>
Specify the length used for subany indices. An attribute
value must have at least this many characters in order to
be processed. Attribute values longer than this length will
be processed in segments of this length. The default is 4.
The subany index will also be used in subinitial and
subfinal index lookups when the filter string is longer
than the olcIndexSubstrIfMaxlen value.
olcIndexSubstrAnyStep: <integer>
Specify the steps used in subany index lookups. This value
sets the offset for the segments of a filter string that
are processed for a subany index lookup. The default is 2.
For example, with the default values, a search using this
filter "cn=*abcdefgh*" would generate index lookups for
"abcd", "cdef", and "efgh".
Note: Indexing support depends on the particular backend in use.
Also, changing these settings will generally require deleting any
indices that depend on these parameters and recreating them with
slapindex(8).
olcListenerThreads: <integer>
Specify the number of threads to use for the connection
manager. The default is 1 and this is typically adequate
for up to 16 CPU cores. The value should be set to a power
of 2.
olcLocalSSF: <SSF>
Specifies the Security Strength Factor (SSF) to be given
local LDAP sessions, such as those to the ldapi://
listener. For a description of SSF values, see
olcSaslSecProps's minssf option description. The default
is 71.
olcLogFile: <filename>
Specify a file for recording slapd debug messages. These
messages are unrelated to messages exposed by the
olcLogLevel configuration parameter. This setting only
affects the slapd daemon and has no effect on the command
line tools. 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.
olcLogFileFormat: debug|syslog-utc|syslog-localtime|rfc3339-utc
Specify the prefix format for messages written to the
logfile. The debug format is the normal format used for
slapd debug messages, with a timestamp in hexadecimal,
followed by a thread ID. The other options are to use
syslog(3) style prefixes, with timestamps either in UTC or
in the local timezone. The default is debug format.
olcLogFileOnly: TRUE | FALSE
Specify that debug messages should only go to the
configured logfile, and not to stderr.
olcLogFileRotate: <max> <Mbytes> <hours>
Specify automatic rotation for the configured logfile as
the maximum number of old logfiles to retain, a maximum
size in megabytes to allow a logfile to grow before
rotation, and a maximum age in hours for a logfile to be
used before rotation. The maximum number must be in the
range 1-99. Setting Mbytes or hours to zero disables the
size or age check, respectively. At least one of Mbytes or
hours must be non-zero. By default no automatic rotation
will be performed.
olcLogLevel: <integer> [...]
Specify the level at which debugging statements and
operation statistics should be syslogged (currently logged
to the syslogd(8) LOG_LOCAL4 facility). They must be
considered subsystems rather than increasingly verbose log
levels. Some messages with higher priority are logged
regardless of the configured loglevel as soon as any
logging is configured. Log levels are additive, and
available levels are:
1 (0x1 trace) trace function calls
2 (0x2 packets) debug packet handling
4 (0x4 args) heavy trace debugging (function
args)
8 (0x8 conns) connection management
16 (0x10 BER) print out packets sent and
received
32 (0x20 filter) search filter processing
64 (0x40 config) configuration file processing
128 (0x80 ACL) access control list processing
256 (0x100 stats) connections, LDAP operations,
results (recommended)
512 (0x200 stats2) stats2 log entries sent
1024 (0x400 shell) print communication with shell
backends
2048 (0x800 parse) entry parsing
16384 (0x4000 sync) LDAPSync replication
32768 (0x8000 none) only messages that get logged
whatever log level is set
The desired log level can be input as a single integer that
combines the (ORed) desired levels, both in decimal or in
hexadecimal notation, as a list of integers (that are ORed
internally), or as a list of the names that are shown
between parenthesis, such that
olcLogLevel: 129
olcLogLevel: 0x81
olcLogLevel: 128 1
olcLogLevel: 0x80 0x1
olcLogLevel: acl trace
are equivalent. The keyword any can be used as a shortcut
to enable logging at all levels (equivalent to -1). The
keyword none, or the equivalent integer representation,
causes those messages that are logged regardless of the
configured olcLogLevel to be logged. In fact, if no
olcLogLevel (or a 0 level) is defined, no logging occurs,
so at least the none level is required to have high
priority messages logged.
Note that the packets, BER, and parse levels are only
available as debug output on stderr, and are not sent to
syslog.
This setting defaults to stats. This level should usually
also be included when using other loglevels, to help
analyze the logs.
olcMaxFilterDepth: <integer>
Specify the maximum depth of nested filters in search
requests. The default is 1000.
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 salt.
olcPidFile: <filename>
The (absolute) name of a file that will hold the slapd
server's process ID (see getpid(2)).
olcPluginLogFile: <filename>
The ( absolute ) name of a file that will contain log
messages from SLAPI plugins. See slapd.plugin(5) for
details.
olcReferral: <url>
Specify the referral to pass back when slapd(8) cannot find
a local database to handle a request. If multiple values
are specified, each url is provided.
olcReverseLookup: TRUE | FALSE
Enable/disable client name unverified reverse lookup
(default is FALSE if compiled with --enable-rlookups).
olcRootDSE: <file>
Specify the name of an LDIF(5) file containing user defined
attributes for the root DSE. These attributes are returned
in addition to the attributes normally produced by slapd.
The root DSE is an entry with information about the server
and its capabilities, in operational attributes. It has
the empty DN, and can be read with e.g.:
ldapsearch -x -b "" -s base "+"
See RFC 4512 section 5.1 for details.
olcSaslAuxprops: <plugin> [...]
Specify which auxprop plugins to use for authentication
lookups. The default is empty, which just uses slapd's
internal support. Usually no other auxprop plugins are
needed.
olcSaslAuxpropsDontUseCopy: <attr> [...]
Specify which attribute(s) should be subject to the don't
use copy control. This is necessary for some SASL
mechanisms such as OTP to work in a replicated environment.
The attribute "cmusaslsecretOTP" is the default value.
olcSaslAuxpropsDontUseCopyIgnore TRUE | FALSE
Used to disable replication of the attribute(s) defined by
olcSaslAuxpropsDontUseCopy and instead use a local value
for the attribute. This allows the SASL mechanism to
continue to work if the provider is offline. This can cause
replication inconsistency. Defaults to FALSE.
olcSaslHost: <fqdn>
Used to specify the fully qualified domain name used for
SASL processing.
olcSaslRealm: <realm>
Specify SASL realm. Default is empty.
olcSaslCbinding: none | tls-unique | tls-endpoint
Specify the channel-binding type, see also
LDAP_OPT_X_SASL_CBINDING. Default is none.
olcSaslSecProps: <properties>
Used to specify Cyrus SASL security properties. The none
flag (without any other properties) causes the flag
properties default, "noanonymous,noplain", to be cleared.
The noplain flag disables mechanisms susceptible to simple
passive attacks. The noactive flag disables mechanisms
susceptible to active attacks. The nodict flag disables
mechanisms susceptible to passive dictionary attacks. The
noanonymous flag disables mechanisms which support
anonymous login. The forwardsec flag require forward
secrecy between sessions. The passcred require mechanisms
which pass client credentials (and allow mechanisms which
can pass credentials to do so). The minssf=<factor>
property specifies the minimum acceptable security strength
factor as an integer approximate to effective key length
used for encryption. 0 (zero) implies no protection, 1
implies integrity protection only, 128 allows RC4, Blowfish
and other similar ciphers, 256 will require modern ciphers.
The default is 0. The maxssf=<factor> property specifies
the maximum acceptable security strength factor as an
integer (see minssf description). The default is INT_MAX.
The maxbufsize=<size> property specifies the maximum
security layer receive buffer size allowed. 0 disables
security layers. The default is 65536.
olcServerID: <integer> [<URL>]
Specify an integer ID from 0 to 4095 for this server. The
ID may also be specified as a hexadecimal ID by prefixing
the value with "0x". Non-zero IDs are required when using
multi-provider replication and each provider must have a
unique non-zero ID. Note that this requirement also applies
to separate providers contributing to a glued set of
databases. If the URL is provided, this directive may be
specified multiple times, providing a complete list of
participating servers and their IDs. The fully qualified
hostname of each server should be used in the supplied
URLs. The IDs are used in the "replica id" field of all
CSNs generated by the specified server. The default value
is zero, which is only valid for single provider
replication. Example:
olcServerID: 1 ldap://ldap1.example.com
olcServerID: 2 ldap://ldap2.example.com
olcSockbufMaxIncoming: <integer>
Specify the maximum incoming LDAP PDU size for anonymous
sessions. The default is 262143.
olcSockbufMaxIncomingAuth: <integer>
Specify the maximum incoming LDAP PDU size for
authenticated sessions. The default is 4194303.
olcTCPBuffer [listener=<URL>] [{read|write}=]<size>
Specify the size of the TCP buffer. A global value for
both read and write TCP buffers related to any listener is
defined, unless the listener is explicitly specified, or
either the read or write qualifiers are used. See tcp(7)
for details. Note that some OS-es implement automatic TCP
buffer tuning.
olcThreads: <integer>
Specify the maximum size of the primary thread pool. The
default is 16; the minimum value is 2.
olcThreadQueues: <integer>
Specify the number of work queues to use for the primary
thread pool. The default is 1 and this is typically
adequate for up to 8 CPU cores. The value should not
exceed the number of CPUs in the system.
olcToolThreads: <integer>
Specify the maximum number of threads to use in tool mode.
This should not be greater than the number of CPUs in the
system. The default is 1.
olcWriteTimeout: <integer>
Specify the number of seconds to wait before forcibly
closing a connection with an outstanding write. This
allows recovery from various network hang conditions. A
setting of 0 disables this feature. The default is 0.
If slapd is built with support for Transport Layer Security, there
are more options you can specify.
olcTLSCipherSuite: <cipher-suite-spec>
Permits configuring what ciphers will be accepted and the
preference order. <cipher-suite-spec> should be a cipher
specification for the TLS library in use (OpenSSL or
GnuTLS). This directive is not supported when using
MbedTLS. Example:
OpenSSL:
olcTLSCipherSuite: HIGH:MEDIUM:+SSLv2
GnuTLS:
olcTLSCiphersuite: SECURE256:!AES-128-CBC
To check what ciphers a given spec selects in OpenSSL, use:
openssl ciphers -v <cipher-suite-spec>
With GnuTLS the available specs can be found in the manual
page of gnutls-cli(1) (see the description of the option
--priority).
In older versions of GnuTLS, where gnutls-cli does not
support the option --priority, you can obtain the — more
limited — list of ciphers by calling:
gnutls-cli -l
olcTLSCACertificateFile: <filename>
Specifies the file that contains certificates for all of
the Certificate Authorities that slapd will recognize. The
certificate for the CA that signed the server certificate
must be included among these certificates. If the signing
CA was not a top-level (root) CA, certificates for the
entire sequence of CA's from the signing CA to the top-
level CA should be present. Multiple certificates are
simply appended to the file; the order is not significant.
olcTLSCACertificatePath: <path>
Specifies the path of directories that contain Certificate
Authority certificates in separate individual files.
Usually only one of this or the olcTLSCACertificateFile is
defined. If both are specified, both locations will be
used. Multiple directories may be specified, separated by a
semi-colon.
olcTLSCACertificate: <CA cert>
Stores a single CA certificate that will be trusted by the
server, in DER format. If this option is set, the
olcTLSCACertificateFile and olcTLSCACertificatePath options
are ignored. If multiple CA certificates are required, the
olcTLSCACertificateFile or olcTLSCACertificatePath options
must be used instead of this option.
olcTLSCertificateFile: <filename>
Specifies the file that contains the slapd server
certificate.
When using OpenSSL that file may also contain any number of
intermediate certificates after the server certificate.
olcTLSCertificate: <cert>
Stores a single certificate for the server, in DER format.
If this option is used, the olcTLSCertificateFile option is
ignored.
olcTLSCertificateKeyFile: <filename>
Specifies the file that contains the slapd server private
key that matches the specified server certificate. If the
private key file 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.
olcTLSCertificateKey <key>
Stores the private key that matches the server certificate.
If this option is used, the olcTLSCertificateKeyFile option
is ignored.
olcTLSDHParamFile: <filename>
This directive specifies the file that contains parameters
for Diffie-Hellman ephemeral key exchange. This is
required in order to use a DSA certificate on the server,
or an RSA certificate missing the "key encipherment" key
usage. Note that setting this option may also enable
Anonymous Diffie-Hellman key exchanges in certain non-
default cipher suites. Anonymous key exchanges should
generally be avoided since they provide no actual client or
server authentication and provide no protection against
man-in-the-middle attacks. You should append "!ADH" to
your cipher suites to ensure that these suites are not
used. This directive is not supported when using MbedTLS.
olcTLSECName: <name>
Specify the name of the curve(s) to use for Elliptic curve
Diffie-Hellman ephemeral key exchange. This option is only
used for OpenSSL. This option is not used with GnuTLS; the
curves may be chosen in the GnuTLS ciphersuite
specification.
olcTLSProtocolMin: <major>[.<minor>]
Specifies minimum SSL/TLS protocol version that will be
negotiated. If the server doesn't support at least that
version, the SSL handshake will fail. To require TLS 1.x
or higher, set this option to 3.(x+1), e.g.,
olcTLSProtocolMin: 3.2
would require TLS 1.1. Specifying a minimum that is higher
than that supported by the OpenLDAP implementation will
result in it requiring the highest level that it does
support. This directive is ignored with GnuTLS.
olcTLSRandFile: <filename>
Specifies the file to obtain random bits from when
/dev/[u]random is not available. Generally set to the name
of the EGD/PRNGD socket. The environment variable RANDFILE
can also be used to specify the filename. This directive
is ignored with GnuTLS.
olcTLSVerifyClient: <level>
Specifies what checks to perform on client certificates in
an incoming TLS session, if any. The <level> can be
specified as one of the following keywords:
never This is the default. slapd will not ask the client
for a certificate.
allow The client certificate is requested. If no
certificate is provided, the session proceeds
normally. If a bad certificate is provided, it will
be ignored and the session proceeds normally.
try The client certificate is requested. If no
certificate is provided, the session proceeds
normally. If a bad certificate is provided, the
session is immediately terminated.
demand | hard | true
These keywords are all equivalent, for compatibility
reasons. The client certificate is requested. If
no certificate is provided, or a bad certificate is
provided, the session is immediately terminated.
Note that a valid client certificate is required in
order to use the SASL EXTERNAL authentication
mechanism with a TLS session. As such, a non-
default olcTLSVerifyClient setting must be chosen to
enable SASL EXTERNAL authentication.
olcTLSCRLCheck: <level>
Specifies if the Certificate Revocation List (CRL) of the
CA should be used to verify if the client certificates have
not been revoked. This requires olcTLSCACertificatePath
parameter to be set. This parameter is ignored with GnuTLS.
<level> can be specified as one of the following keywords:
none No CRL checks are performed
peer Check the CRL of the peer certificate
all Check the CRL for a whole certificate chain
olcTLSCRLFile: <filename>
Specifies a file containing a Certificate Revocation List
to be used for verifying that certificates have not been
revoked. This parameter is only valid when using GnuTLS.
If slapd is compiled with --enable-modules then the module-related
entries will be available. These entries are named
cn=module{x},cn=config and must have the olcModuleList
objectClass. One entry should be created per olcModulePath.
Normally the config engine generates the "{x}" index in the RDN
automatically, so it can be omitted when initially loading these
entries.
olcModuleLoad: <filename> [<arguments>...]
Specify the name of a dynamically loadable module to load
and any additional arguments if supported by the module.
The filename may be an absolute path name or a simple
filename. Non-absolute names are searched for in the
directories specified by the olcModulePath option.
olcModulePath: <pathspec>
Specify a list of directories to search for loadable
modules. Typically the path is colon-separated but this
depends on the operating system. The default is MODULEDIR,
which is where the standard OpenLDAP install will place its
modules.
Schema definitions are created as entries in the
cn=schema,cn=config subtree. These entries must have the
olcSchemaConfig objectClass. As noted above, the actual
cn=schema,cn=config entry is predefined and any values specified
for it are ignored.
olcAttributetypes: ( <oid> [NAME <name>] [DESC <description>]
[OBSOLETE] [SUP <oid>] [EQUALITY <oid>] [ORDERING <oid>]
[SUBSTR <oid>] [SYNTAX <oidlen>] [SINGLE-VALUE]
[COLLECTIVE] [NO-USER-MODIFICATION]
[USAGE <attributeUsage>] )
Specify an attribute type using the LDAPv3 syntax defined
in RFC 4512. The slapd parser extends the RFC 4512
definition by allowing string forms as well as numeric OIDs
to be used for the attribute OID and attribute syntax OID.
(See the olcObjectIdentifier description.)
olcDitContentRules: ( <oid> [NAME <name>] [DESC <description>]
[OBSOLETE] [AUX <oids>] [MUST <oids>] [MAY <oids>]
[NOT <oids>] )
Specify an DIT Content Rule using the LDAPv3 syntax defined
in RFC 4512. The slapd parser extends the RFC 4512
definition by allowing string forms as well as numeric OIDs
to be used for the attribute OID and attribute syntax OID.
(See the olcObjectIdentifier description.)
olcLdapSyntaxes ( <oid> [DESC <description>] [X-SUBST <substitute-
syntax>] )
Specify an LDAP syntax using the LDAPv3 syntax defined in
RFC 4512. The slapd parser extends the RFC 4512 definition
by allowing string forms as well as numeric OIDs to be used
for the syntax OID. (See the objectidentifier
description.) The slapd parser also honors the X-SUBST
extension (an OpenLDAP-specific extension), which allows
one to use the olcLdapSyntaxes attribute to define a non-
implemented syntax along with another syntax, the extension
value substitute-syntax, as its temporary replacement. The
substitute-syntax must be defined. This allows one to
define attribute types that make use of non-implemented
syntaxes using the correct syntax OID. Unless X-SUBST is
used, this configuration statement would result in an
error, since no handlers would be associated to the
resulting syntax structure.
olcObjectClasses: ( <oid> [NAME <name>] [DESC <description>]
[OBSOLETE] [SUP <oids>] [{ ABSTRACT | STRUCTURAL |
AUXILIARY }] [MUST <oids>] [MAY <oids>] )
Specify an objectclass using the LDAPv3 syntax defined in
RFC 4512. The slapd parser extends the RFC 4512 definition
by allowing string forms as well as numeric OIDs to be used
for the object class OID. (See the olcObjectIdentifier
description.) Object classes are "STRUCTURAL" by default.
olcObjectIdentifier: <name> { <oid> | <name>[:<suffix>] }
Define a string name that equates to the given OID. The
string can be used in place of the numeric OID in
objectclass and attribute definitions. The name can also be
used with a suffix of the form ":xx" in which case the
value "oid.xx" will be used.
Options in these entries only apply to the configuration of a
single type of backend. All backends may support this class of
options, but currently only back-mdb does. The entry must be
named olcBackend=<databasetype>,cn=config and must have the
olcBackendConfig objectClass. <databasetype> should be one of
asyncmeta, config, dnssrv, ldap, ldif, mdb, meta, monitor, null,
passwd, perl, relay, sock, sql, or wt. At present, only back-mdb
implements any options of this type, so this entry should not be
used for any other backends.
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 rejected.
olcRequires: <conditions>
Specify a set of conditions to require (default none). The
directive may be specified globally and/or per-database;
databases inherit global conditions, so per-database
specifications are additive. bind requires bind operation
prior to directory operations. LDAPv3 requires session to
be using LDAP version 3. authc requires authentication
prior to directory operations. SASL requires SASL
authentication prior to directory operations. strong
requires strong authentication prior to directory
operations. The strong keyword allows protected "simple"
authentication as well as SASL authentication. none may be
used to require no conditions (useful to clear out globally
set conditions within a particular database); it must occur
first in the list of conditions.
olcRestrict: <oplist>
Specify a list of operations that are restricted.
Restrictions on a specific database override any frontend
setting. Operations can be any of add, bind, compare,
delete, extended[=<OID>], modify, rename, search, or the
special pseudo-operations read and write, which
respectively summarize read and write operations. The use
of restrict write is equivalent to olcReadOnly: TRUE (see
above). The extended keyword allows one to indicate the
OID of the specific operation to be restricted.
olcSchemaDN: <dn>
Specify the distinguished name for the subschema subentry
that controls the entries on this server. The default is
"cn=Subschema".
olcSecurity: <factors>
Specify a set of security strength factors (separated by
white space) to require (see olcSaslSecprops's minssf
option for a description of security strength factors).
The directive may be specified globally and/or per-
database. ssf=<n> specifies the overall security strength
factor. transport=<n> specifies the transport security
strength factor. tls=<n> specifies the TLS security
strength factor. sasl=<n> specifies the SASL security
strength factor. update_ssf=<n> specifies the overall
security strength factor to require for directory updates.
update_transport=<n> specifies the transport security
strength factor to require for directory updates.
update_tls=<n> specifies the TLS security strength factor
to require for directory updates. update_sasl=<n>
specifies the SASL security strength factor to require for
directory updates. simple_bind=<n> specifies the security
strength factor required for simple username/password
authentication. Note that the transport factor is measure
of security provided by the underlying transport, e.g.
ldapi:// (and eventually IPSEC). It is not normally used.
olcSizeLimit: {<integer>|unlimited}
olcSizeLimit: size[.{soft|hard}]=<integer> [...]
Specify the maximum number of entries to return from a
search operation. The default size limit is 500. Use
unlimited to specify no limits. The second format allows a
fine grain setting of the size limits. If no special
qualifiers are specified, both soft and hard limits are
set. Extra args can be added in the same value.
Additional qualifiers are available; see olcLimits for an
explanation of all of the different flags.
olcSortVals: <attr> [...]
Specify a list of multi-valued attributes whose values will
always be maintained in sorted order. Using this option
will allow Modify, Compare, and filter evaluations on these
attributes to be performed more efficiently. The resulting
sort order depends on the attributes' syntax and matching
rules and may not correspond to lexical order or any other
recognizable order. This setting is only allowed in the
frontend entry.
olcTimeLimit: {<integer>|unlimited}
olcTimeLimit: time[.{soft|hard}]=<integer> [...]
Specify the maximum number of seconds (in real time) slapd
will spend answering a search request. The default time
limit is 3600. Use unlimited to specify no limits. The
second format allows a fine grain setting of the time
limits. Extra args can be added in the same value. See
olcLimits for an explanation of the different flags.
Options in this section only apply to the specific database for
which they are defined. They are supported by every type of
backend. All of the Global Database Options may also be used here.
olcAddContentAcl: TRUE | FALSE
Controls whether Add operations will perform ACL checks on
the content of the entry being added. This check is off by
default. See the slapd.access(5) manual page for more
details on ACL requirements for Add operations.
olcHidden: TRUE | FALSE
Controls whether the database will be used to answer
queries. A database that is hidden will never be selected
to answer any queries, and any suffix configured on the
database will be ignored in checks for conflicts with other
databases. By default, olcHidden is FALSE.
olcLastMod: TRUE | FALSE
Controls whether slapd will automatically maintain the
modifiersName, modifyTimestamp, creatorsName, and
createTimestamp attributes for entries. It also controls
the entryCSN and entryUUID attributes, which are needed by
the syncrepl provider. By default, olcLastMod is TRUE.
olcLastBind: TRUE | FALSE
Controls whether slapd will automatically maintain the
pwdLastSuccess attribute for entries. By default,
olcLastBind is FALSE.
olcLastBindPrecision: <integer>
If olcLastBind is enabled, specifies how frequently
pwdLastSuccess will be updated. More than integer seconds
must have passed since the last successful bind. In a
replicated environment with frequent bind activity it may
be useful to set this to a large value. On a backend, if
set to 0 (the default), the value set on the frontend is
used.
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>
with
<dnspec> ::= dn[.<type>][.<style>]
<type> ::= self | this
<style> ::= exact | base | onelevel | subtree |
children | regex | anonymous
DN type self is the default and means the bound user, while
this means the base DN of the operation. The term
anonymous matches all unauthenticated clients. The term
users matches all authenticated clients; otherwise an exact
dn pattern is assumed unless otherwise specified by
qualifying the (optional) key string dn with exact or base
(which are synonyms), to require an exact match; with
onelevel, to require exactly one level of depth match; with
subtree, to allow any level of depth match, including the
exact match; with children, to allow any level of depth
match, not including the exact match; regex explicitly
requires the (default) match based on POSIX (''extended'')
regular expression pattern. Finally, anonymous matches
unbound operations; the pattern field is ignored. The same
behavior is obtained by using the anonymous form of the
<selector> clause. The term group, with the optional
objectClass oc and attributeType at fields, followed by
pattern, sets the limits for any DN listed in the values of
the at attribute (default member) of the oc group
objectClass (default groupOfNames) whose DN exactly matches
pattern.
The currently supported limits are size and time.
The syntax for time limits is time[.{soft|hard}]=<integer>,
where integer is the number of seconds slapd will spend
answering a search request. If no time limit is explicitly
requested by the client, the soft limit is used; if the
requested time limit exceeds the hard limit, the value of
the limit is used instead. If the hard limit is set to the
keyword soft, the soft limit is used in either case; if it
is set to the keyword unlimited, no hard limit is enforced.
Explicit requests for time limits smaller or equal to the
hard limit are honored. If no limit specifier is set, the
value is assigned to the soft limit, and the hard limit is
set to soft, to preserve the original behavior.
The syntax for size limits is
size[.{soft|hard|unchecked}]=<integer>, where integer is
the maximum number of entries slapd will return answering a
search request. If no size limit is explicitly requested
by the client, the soft limit is used; if the requested
size limit exceeds the hard limit, the value of the limit
is used instead. If the hard limit is set to the keyword
soft, the soft limit is used in either case; if it is set
to the keyword unlimited, no hard limit is enforced.
Explicit requests for size limits smaller or equal to the
hard limit are honored. The unchecked specifier sets a
limit on the number of candidates a search request is
allowed to examine. The rationale behind it is that
searches for non-properly indexed attributes may result in
large sets of candidates, which must be examined by
slapd(8) to determine whether they match the search filter
or not. The unchecked limit provides a means to drop such
operations before they are even started. If the selected
candidates exceed the unchecked limit, the search will
abort with Unwilling to perform. If it is set to the
keyword unlimited, no limit is applied (the default). If
it is set to disabled, the search is not even performed;
this can be used to disallow searches for a specific set of
users. If no limit specifier is set, the value is assigned
to the soft limit, and the hard limit is set to soft, to
preserve the original behavior.
In case of no match, the global limits are used. The
default values are the same as for 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>|hard|unlimited|disabled}
allows one to set a limit on the total number of entries
that the pagedResults control will return. By default it
is set to the hard limit which will use the size.hard
value. When set, integer is the max number of entries that
the whole search with pagedResults control can return. Use
unlimited to allow unlimited number of entries to be
returned, e.g. to allow the use of the pagedResults control
as a means to circumvent size limitations on regular
searches; the keyword disabled disables the control, i.e.
no paged results can be returned. Note that the total
number of entries returned when the pagedResults control is
requested cannot exceed the hard size limit of regular
searches unless extended by the prtotal switch.
The olcLimits statement is typically used to let an
unlimited number of entries be returned by searches
performed with the identity used by the consumer for
synchronization purposes by means of the RFC 4533 LDAP
Content Synchronization protocol (see olcSyncrepl for
details).
When using subordinate databases, it is necessary for any
limits that are to be applied across the parent and its
subordinates to be defined in both the parent and its
subordinates. Otherwise the settings on the subordinate
databases are not honored.
olcMaxDerefDepth: <depth>
Specifies the maximum number of aliases to dereference when
trying to resolve an entry, used to avoid infinite alias
loops. The default is 15.
olcMultiProvider: TRUE | FALSE
This option puts a consumer database into Multi-Provider
mode. Update operations will be accepted from any user,
not just the updatedn. The database must already be
configured as a syncrepl consumer before this keyword may
be set. This mode also requires a olcServerID (see above)
to be configured. By default, this setting is FALSE.
olcMonitoring: TRUE | FALSE
This option enables database-specific monitoring in the
entry related to the current database in the
"cn=Databases,cn=Monitor" subtree of the monitor database,
if the monitor database is enabled. Currently, only the
MDB database provides database-specific monitoring. If
monitoring is supported by the backend it defaults to TRUE,
otherwise FALSE.
olcPlugin: <plugin_type> <lib_path> <init_function> [<arguments>]
Configure a SLAPI plugin. See the slapd.plugin(5) manpage
for more details.
olcRootDN: <dn>
Specify the distinguished name that is not subject to
access control or administrative limit restrictions for
operations on this database. This DN may or may not be
associated with an entry. An empty root DN (the default)
specifies no root access is to be granted. It is
recommended that the rootdn only be specified when needed
(such as when initially populating a database). If the
rootdn is within a namingContext (suffix) of the database,
a simple bind password may also be provided using the
olcRootPW directive. Many optional features, including
syncrepl, require the rootdn to be defined for the
database. The olcRootDN of the cn=config database defaults
to cn=config itself.
olcRootPW: <password>
Specify a password (or hash of the password) for the
rootdn. The password can only be set if the rootdn is
within the namingContext (suffix) of the database. This
option accepts all RFC 2307 userPassword formats known to
the server (see olcPasswordHash description) as well as
cleartext. slappasswd(8) may be used to generate a hash of
a password. Cleartext and {CRYPT} passwords are not
recommended. If empty (the default), authentication of the
root DN is by other means (e.g. SASL). Use of SASL is
encouraged.
olcSubordinate: [TRUE | FALSE | advertise]
Specify that the current backend database is a subordinate
of another backend database. A subordinate database may
have only one suffix. This option may be used to glue
multiple databases into a single namingContext. If the
suffix of the current database is within the namingContext
of a superior database, searches against the superior
database will be propagated to the subordinate as well. All
of the databases associated with a single namingContext
should have identical rootdns. Behavior of other LDAP
operations is unaffected by this setting. In particular, it
is not possible to use moddn to move an entry from one
subordinate to another subordinate within the
namingContext.
If the optional advertise flag is supplied, the naming
context of this database is advertised in the root DSE. The
default is to hide this database context, so that only the
superior context is visible.
If the slap tools slapcat(8), slapadd(8), slapmodify(8), or
slapindex(8) are used on the superior database, any glued
subordinates that support these tools are opened as well.
Databases that are glued together should usually be
configured with the same indices (assuming they support
indexing), even for attributes that only exist in some of
these databases. In general, all of the glued databases
should be configured as similarly as possible, since the
intent is to provide the appearance of a single directory.
Note that the subordinate functionality is implemented
internally by the glue overlay and as such its behavior
will interact with other overlays in use. By default, the
glue overlay is automatically configured as the last
overlay on the superior database. Its position on the
database can be explicitly configured by setting an overlay
glue directive at the desired position. This explicit
configuration is necessary e.g. when using the syncprov
overlay, which needs to follow glue in order to work over
all of the glued databases. E.g.
dn: olcDatabase={1}mdb,cn=config
olcSuffix: dc=example,dc=com
...
dn: olcOverlay={0}glue,olcDatabase={1}mdb,cn=config
...
dn: olcOverlay={1}syncprov,olcDatabase={1}mdb,cn=config
...
See the Overlays section below for more details.
olcSuffix: <dn suffix>
Specify the DN suffix of queries that will be passed to
this backend database. Multiple suffix lines can be given
and at least one is required for each database definition.
If the suffix of one database is "inside" that of another,
the database with the inner suffix must come first in the
configuration file. You may also want to glue such
databases together with the olcSubordinate attribute.
olcSyncUseSubentry: TRUE | FALSE
Store the syncrepl contextCSN in a subentry instead of the
context entry of the database. The subentry's RDN will be
"cn=ldapsync". The default is FALSE, meaning the contextCSN
is stored in the context entry.
olcSyncrepl: rid=<replica ID> provider=ldap[s]://<hostname>[:port]
searchbase=<base DN> [type=refreshOnly|refreshAndPersist]
[interval=dd:hh:mm:ss] [retry=[<retry interval> <# of
retries>]+] [filter=<filter str>]
[scope=sub|one|base|subord] [attrs=<attr list>]
[exattrs=<attr list>] [attrsonly] [sizelimit=<limit>]
[timelimit=<limit>] [schemachecking=on|off]
[network-timeout=<seconds>] [timeout=<seconds>]
[tcp-user-timeout=<milliseconds>] [bindmethod=simple|sasl]
[binddn=<dn>] [saslmech=<mech>] [authcid=<identity>]
[authzid=<identity>] [credentials=<passwd>] [realm=<realm>]
[secprops=<properties>]
[keepalive=<idle>:<probes>:<interval>]
[starttls=yes|critical] [tls_cert=<file>] [tls_key=<file>]
[tls_cacert=<file>] [tls_cacertdir=<path>]
[tls_reqcert=never|allow|try|demand]
[tls_reqsan=never|allow|try|demand]
[tls_cipher_suite=<ciphers>] [tls_ecname=<names>]
[tls_crlcheck=none|peer|all]
[tls_protocol_min=<major>[.<minor>]] [suffixmassage=<real
DN>] [logbase=<base DN>] [logfilter=<filter str>]
[syncdata=default|accesslog|changelog] [lazycommit]
Specify the current database as a consumer which is kept
up-to-date with the provider content by establishing the
current slapd(8) as a replication consumer site running a
syncrepl replication engine. The consumer content is kept
synchronized to the provider content using the LDAP Content
Synchronization protocol. Refer to the "OpenLDAP
Administrator's Guide" for detailed information on setting
up a replicated slapd directory service using the syncrepl
replication engine.
rid identifies the current syncrepl directive within the
replication consumer site. It is a non-negative integer
not greater than 999 (limited to three decimal digits).
provider specifies the replication provider site containing
the provider content as an LDAP URI. If <port> is not
given, the standard LDAP port number (389 or 636) is used.
The content of the syncrepl consumer is defined using a
search specification as its result set. The consumer slapd
will send search requests to the provider slapd according
to the search specification. The search specification
includes searchbase, scope, filter, attrs, attrsonly,
sizelimit, and timelimit parameters as in the normal search
specification. The exattrs option may also be used to
specify attributes that should be omitted from incoming
entries. The scope defaults to sub, the filter defaults to
(objectclass=*), and there is no default searchbase. The
attrs list defaults to "*,+" to return all user and
operational attributes, and attrsonly and exattrs are unset
by default. The sizelimit and timelimit only accept
"unlimited" and positive integers, and both default to
"unlimited". The sizelimit and timelimit parameters define
a consumer requested limitation on the number of entries
that can be returned by the LDAP Content Synchronization
operation; these should be left unchanged from the default
otherwise replication may never succeed. Note, however,
that any provider-side limits for the replication identity
will be enforced by the provider regardless of the limits
requested by the LDAP Content Synchronization operation,
much like for any other search operation.
The LDAP Content Synchronization protocol has two operation
types. In the refreshOnly operation, the next
synchronization search operation is periodically
rescheduled at an interval time (specified by interval
parameter; 1 day by default) after each synchronization
operation finishes. In the refreshAndPersist operation, a
synchronization search remains persistent in the provider
slapd. Further updates to the provider will generate
searchResultEntry to the consumer slapd as the search
responses to the persistent synchronization search. If the
initial search fails due to an error, the next
synchronization search operation is periodically
rescheduled at an interval time (specified by interval
parameter; 1 day by default)
If an error occurs during replication, the consumer will
attempt to reconnect according to the retry parameter which
is a list of the <retry interval> and <# of retries> pairs.
For example, retry="60 10 300 3" lets the consumer retry
every 60 seconds for the first 10 times and then retry
every 300 seconds for the next 3 times before stop
retrying. The `+' in <# of retries> means indefinite number
of retries until success. If no retry is specified, by
default syncrepl retries every hour forever.
The schema checking can be enforced at the LDAP Sync
consumer site by turning on the schemachecking parameter.
The default is off. Schema checking on means that
replicated entries must have a structural objectClass, must
obey to objectClass requirements in terms of
required/allowed attributes, and that naming attributes and
distinguished values must be present. As a consequence,
schema checking should be off when partial replication is
used.
The network-timeout parameter sets how long the consumer
will wait to establish a network connection to the
provider. Once a connection is established, the timeout
parameter determines how long the consumer will wait for
the initial Bind request to complete. The defaults for
these parameters come from ldap.conf(5). The
tcp-user-timeout parameter, if non-zero, corresponds to the
TCP_USER_TIMEOUT set on the target connections, overriding
the operating system setting. Only some systems support
the customization of this parameter, it is ignored
otherwise and system-wide settings are used.
A bindmethod of simple requires the options binddn and
credentials and should only be used when adequate security
services (e.g. TLS or IPSEC) are in place. REMEMBER:
simple bind credentials must be in cleartext! A bindmethod
of sasl requires the option saslmech. Depending on the
mechanism, an authentication identity and/or credentials
can be specified using authcid and credentials. The
authzid parameter may be used to specify an authorization
identity. Specific security properties (as with the
sasl-secprops keyword above) for a SASL bind can be set
with the secprops option. A non default SASL realm can be
set with the realm option. The identity used for
synchronization by the consumer should be allowed to
receive an unlimited number of entries in response to a
search request. The provider, other than allowing
authentication of the syncrepl identity, should grant that
identity appropriate access privileges to the data that is
being replicated (access directive), and appropriate time
and size limits. This can be accomplished by either
allowing unlimited sizelimit and timelimit, or by setting
an appropriate limits statement in the consumer's
configuration (see sizelimit and limits for details).
The keepalive parameter sets the values of idle, probes,
and interval used to check whether a socket is alive; idle
is the number of seconds a connection needs to remain idle
before TCP starts sending keepalive probes; probes is the
maximum number of keepalive probes TCP should send before
dropping the connection; interval is interval in seconds
between individual keepalive probes. Only some systems
support the customization of these values; the keepalive
parameter is ignored otherwise, and system-wide settings
are used.
The starttls parameter specifies use of the StartTLS
extended operation to establish a TLS session before
Binding to the provider. If the critical argument is
supplied, the session will be aborted if the StartTLS
request fails. Otherwise the syncrepl session continues
without TLS. The tls_reqcert setting defaults to "demand",
the tls_reqsan setting defaults to "allow", and the other
TLS settings default to the same as the main slapd TLS
settings.
The suffixmassage parameter allows the consumer to pull
entries from a remote directory whose DN suffix differs
from the local directory. The portion of the remote
entries' DNs that matches the searchbase will be replaced
with the suffixmassage DN.
Rather than replicating whole entries, the consumer can
query logs of data modifications. This mode of operation is
referred to as delta syncrepl. In addition to the above
parameters, the logbase and logfilter parameters must be
set appropriately for the log that will be used. The
syncdata parameter must be set to either "accesslog" if the
log conforms to the slapo-accesslog(5) log format, or
"changelog" if the log conforms to the obsolete changelog
format. If the syncdata parameter is omitted or set to
"default" then the log parameters are ignored. If
multiprovider is being used, the same logbase database must
be configured on all of the providers.
The lazycommit parameter tells the underlying database that
it can store changes without performing a full flush after
each change. This may improve performance for the consumer,
while sacrificing safety or durability.
olcUpdateDN: <dn>
This option is only applicable in a replica database. It
specifies the DN permitted to update (subject to access
controls) the replica. It is only needed in certain push-
mode replication scenarios. Generally, this DN should not
be the same as the rootdn used at the provider.
olcUpdateRef: <url>
Specify the referral to pass back when slapd(8) is asked to
modify a replicated local database. If multiple values are
specified, each url is provided.
Each database may allow specific configuration options; they are
documented separately in the backends' manual pages. See the
slapd.backends(5) manual page for an overview of available
backends.
An overlay is a piece of code that intercepts database operations
in order to extend or change them. Overlays are pushed onto a
stack over the database, and so they will execute in the reverse
of the order in which they were configured and the database itself
will receive control last of all.
Overlays must be configured as child entries of a specific
database. The entry's RDN must be of the form
olcOverlay={x}<overlaytype> and the entry must have the
olcOverlayConfig objectClass. Normally the config engine generates
the "{x}" index in the RDN automatically, so it can be omitted
when initially loading these entries.
See the slapd.overlays(5) manual page for an overview of available
overlays.
Here is a short example of a configuration in LDIF suitable for
use with slapadd(8) :
dn: cn=config
objectClass: olcGlobal
cn: config
olcPidFile: LOCALSTATEDIR/run/slapd.pid
olcAttributeOptions: x-hidden lang-
dn: cn=schema,cn=config
objectClass: olcSchemaConfig
cn: schema
include: file://SYSCONFDIR/schema/core.ldif
dn: olcDatabase=frontend,cn=config
objectClass: olcDatabaseConfig
objectClass: olcFrontendConfig
olcDatabase: frontend
# Subtypes of "name" (e.g. "cn" and "ou") with the
# option ";x-hidden" can be searched for/compared,
# but are not shown. See slapd.access(5).
olcAccess: to attrs=name;x-hidden by * =cs
# Protect passwords. See slapd.access(5).
olcAccess: to attrs=userPassword by * auth
# Read access to other attributes and entries.
olcAccess: to * by * read
# set a rootpw for the config database so we can bind.
# deny access to everyone else.
dn: olcDatabase=config,cn=config
objectClass: olcDatabaseConfig
olcDatabase: config
olcRootPW: {SSHA}XKYnrjvGT3wZFQrDD5040US592LxsdLy
olcAccess: to * by * none
dn: olcDatabase=mdb,cn=config
objectClass: olcDatabaseConfig
objectClass: olcMdbConfig
olcDatabase: mdb
olcSuffix: "dc=our-domain,dc=com"
# The database directory MUST exist prior to
# running slapd AND should only be accessible
# by the slapd/tools. Mode 0700 recommended.
olcDbDirectory: LOCALSTATEDIR/openldap-data
# 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 ETCDIR/slapd.d directory has been created, this command
will initialize the configuration:
slapadd -F ETCDIR/slapd.d -n 0 -l config.ldif
"OpenLDAP Administrator's Guide" contains a longer annotated
example of a slapd configuration.
Alternatively, an existing slapd.conf file can be converted to the
new format using slapd or any of the slap tools:
slaptest -f ETCDIR/slapd.conf -F ETCDIR/slapd.d
ETCDIR/slapd.conf
default slapd configuration file
ETCDIR/slapd.d
default slapd configuration directory
ldap(3), ldif(5), gnutls-cli(1), slapd.access(5),
slapd.backends(5), slapd.conf(5), slapd.overlays(5),
slapd.plugin(5), slapd(8), slapacl(8), slapadd(8), slapauth(8),
slapcat(8), slapdn(8), slapindex(8), slapmodify(8), slappasswd(8),
slaptest(8).
"OpenLDAP Administrator's Guide"
(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 the University of Michigan LDAP 3.3 Release.
This page is part of the OpenLDAP (an open source implementation
of the Lightweight Directory Access Protocol) project.
Information about the project can be found at
⟨http://www.openldap.org/⟩. If you have a bug report for this
manual page, see ⟨http://www.openldap.org/its/⟩. This page was
obtained from the project's upstream Git repository
⟨https://git.openldap.org/openldap/openldap.git⟩ on 2025-08-11.
(At that time, the date of the most recent commit that was found
in the repository was 2025-08-05.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
OpenLDAP LDVERSION RELEASEDATE SLAPD-CONFIG(5)
Pages that refer to this page: slapd.access(5), slapd.backends(5), slapd.conf(5), slapd-ldap(5), slapd-ldif(5), slapd-mdb(5), slapd-monitor(5), slapd.overlays(5), slapd-relay(5), slapd-sock(5), slapd-wt(5), slapo-accesslog(5), slapo-autoca(5), slapo-chain(5), slapo-collect(5), slapo-constraint(5), slapo-dds(5), slapo-deref(5), slapo-dyngroup(5), slapo-dynlist(5), slapo-homedir(5), slapo-memberof(5), slapo-nestgroup(5), slapo-otp(5), slapo-pbind(5), slapo-pcache(5), slapo-ppolicy(5), slapo-refint(5), slapo-retcode(5), slapo-rwm(5), slapo-sssvlv(5), slapo-syncprov(5), slapo-translucent(5), slapo-unique(5), slapo-valsort(5), lloadd(8), slapacl(8), slapadd(8), slapauth(8), slapcat(8), slapd(8), slapindex(8), slapmodify(8), slappasswd(8), slapschema(8), slaptest(8)
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