# $OpenLDAP: pkg/openldap-guide/admin/slapdconf2.sdf,v 1.1.2.10 2006/01/03 22:16:03 kurt Exp $ # Copyright 2005-2006 The OpenLDAP Foundation, All Rights Reserved. # COPYING RESTRICTIONS APPLY, see COPYRIGHT. H1: Configuring slapd Once the software has been built and installed, you are ready to configure {{slapd}}(8) for use at your site. Unlike previous OpenLDAP releases, the slapd runtime configuration in 2.3 is fully LDAP-enabled and can be managed using the standard LDAP operations with data in {{TERM:LDIF}}. The LDAP configuration engine allows all of slapd's configuration options to be changed on the fly, generally without requiring a server restart for the changes to take effect. The old style {{slapd.conf}}(5) file is still supported, but must be converted to the new {{slapd.d}}(5) format to allow runtime changes to be saved. While the old style configuration uses a single file, normally installed as {{F:/usr/local/etc/openldap/slapd.conf}}, the new style uses a slapd backend database to store the configuration. The configuration database normally resides in the {{F:/usr/local/etc/openldap/slapd.d}} directory. An alternate configuration directory (or file) can be specified via a command-line option to {{slapd}}(8) or {{slurpd}}(8). This chapter describes the general format of the configuration system, followed by a detailed description of commonly used config settings. Note: some of the backends and of the distributed overlays do not support runtime configuration yet. In those cases, the old style {{slapd.conf}}(5) file must be used. Note: the current version of {{slurpd}} has not been updated for compatibility with this new configuration engine. If you must use slurpd for replication at your site, you will have to maintain an old-style {{slapd.conf}} file for slurpd to use. H2: Configuration Layout The slapd configuration is stored as a special LDAP directory with a predefined schema and DIT. There are specific objectClasses used to carry global configuration options, schema definitions, backend and database definitions, and assorted other items. A sample config tree is shown in Figure 5.1. !import "config_dit.gif"; align="center"; title="Sample configuration tree" FT[align="Center"] Figure 5.1: Sample configuration tree. Other objects may be part of the configuration but were omitted from the illustration for clarity. The {{slapd.d}} configuration tree has a very specific structure. The root of the tree is named {{EX:cn=config}} and contains global configuration settings. Additional settings are contained in separate child entries: * Include files .. Usually these are just pathnames left over from a converted {{EX:slapd.conf}} file. .. Otherwise use of Include files is deprecated. * Dynamically loaded modules .. These may only be used if the {{EX:--enable-modules}} option was used to configure the software. * Schema definitions .. The {{EX:cn=schema,cn=config}} entry contains the system schema (all the schema that is hard-coded in slapd). .. Child entries of {{EX:cn=schema,cn=config}} contain user schema as loaded from config files or added at runtime. * Backend-specific configuration * Database-specific configuration .. Overlays are defined in children of the Database entry. .. Databases and Overlays may also have other miscellaneous children. The usual rules for LDIF files apply to the configuration information: Comment lines beginning with a '{{EX:#}}' character are ignored. If a line begins with a single space, it is considered a continuation of the previous line (even if the previous line is a comment) and the single leading space is removed. Entries are separated by blank lines. The general layout of the config LDIF is as follows: > # global configuration settings > dn: cn=config > objectClass: olcGlobal > cn: config > <global config settings> > > # schema definitions > dn: cn=schema,cn=config > objectClass: olcSchemaConfig > cn: schema > <system schema> > > dn: cn={X}core,cn=schema,cn=config > objectClass: olcSchemaConfig > cn: {X}core > <core schema> > > # additional user-specified schema > ... > > # backend definitions > dn: olcBackend=<typeA>,cn=config > objectClass: olcBackendConfig > olcBackend: <typeA> > <backend-specific settings> > > # database definitions > dn: olcDatabase={X}<typeA>,cn=config > objectClass: olcDatabaseConfig > olcDatabase: {X}<typeA> > <database-specific settings> > > # subsequent definitions and settings > ... Some of the entries listed above have a numeric index {{EX:"{X}"}} in their names. While most configuration settings have an inherent ordering dependency (i.e., one setting must take effect before a subsequent one may be set), LDAP databases are inherently unordered. The numeric index is used to enforce a consistent ordering in the configuration database, so that all ordering dependencies are preserved. In most cases the index does not have to be provided; it will be automatically generated based on the order in which entries are created. Configuration directives are specified as values of individual attributes. Most of the attributes and objectClasses used in the slapd configuration have a prefix of {{EX:"olc"}} (OpenLDAP Configuration) in their names. Generally there is a one-to-one correspondence between the attributes and the old-style {{EX:slapd.conf}} configuration keywords, using the keyword as the attribute name, with the "olc" prefix attached. A configuration directive may take arguments. If so, the arguments are separated by white space. If an argument contains white space, the argument should be enclosed in double quotes {{EX:"like this"}}. In the descriptions that follow, arguments that should be replaced by actual text are shown in brackets {{EX:<>}}. The distribution contains an example configuration file that will be installed in the {{F: /usr/local/etc/openldap}} directory. A number of files containing schema definitions (attribute types and object classes) are also provided in the {{F: /usr/local/etc/openldap/schema}} directory. H2: Configuration Directives This section details commonly used configuration directives. For a complete list, see the {{slapd.d}}(5) manual page. This section will treat the configuration directives in a top-down order, starting with the global directives in the {{EX:cn=config}} entry. Each directive will be described along with its default value (if any) and an example of its use. H3: cn=config Directives contained in this entry generally apply to the server as a whole. Most of them are system or connection oriented, not database related. This entry must have the {{EX:olcGlobal}} objectClass. H4: olcIdleTimeout: <integer> Specify the number of seconds to wait before forcibly closing an idle client connection. A value of 0, the default, disables this feature. H4: olcLogLevel: <level> This directive specifies the level at which debugging statements and operation statistics should be syslogged (currently logged to the {{syslogd}}(8) {{EX:LOG_LOCAL4}} facility). You must have configured OpenLDAP {{EX:--enable-debug}} (the default) for this to work (except for the two statistics levels, which are always enabled). Log levels may be specified as integers or by keyword. Multiple log levels may be used and the levels are additive. To display what levels correspond to what kind of debugging, invoke slapd with {{EX:-?}} or consult the table below. The possible values for <level> are: !block table; colaligns="RL"; align=Center; \ title="Table 5.1: Debugging Levels" Level Keyword Description -1 Any enable all debugging 0 no debugging 1 Trace trace function calls 2 Packets debug packet handling 4 Args heavy trace debugging 8 Conns connection management 16 BER print out packets sent and received 32 Filter search filter processing 64 Config configuration processing 128 ACL access control list processing 256 Stats stats log connections/operations/results 512 Stats2 stats log entries sent 1024 Shell print communication with shell backends 2048 Parse print entry parsing debugging 4096 Cache database cache processing 8192 Index database indexing 16384 Sync syncrepl consumer processing !endblock \Example: E: olcLogLevel: -1 This will cause lots and lots of debugging information to be logged. E: olcLogLevel: Conns Filter Just log the connection and search filter processing. \Default: E: olcLogLevel: Stats H4: olcReferral <URI> This directive specifies the referral to pass back when slapd cannot find a local database to handle a request. \Example: > olcReferral: ldap://root.openldap.org This will refer non-local queries to the global root LDAP server at the OpenLDAP Project. Smart LDAP clients can re-ask their query at that server, but note that most of these clients are only going to know how to handle simple LDAP URLs that contain a host part and optionally a distinguished name part. H4: Sample Entry >dn: cn=config >objectClass: olcGlobal >cn: config >olcIdleTimeout: 30 >olcLogLevel: Stats >olcReferral: ldap://root.openldap.org H3: cn=include An include entry holds the pathname of one include file. Include files are part of the old style slapd.conf configuration system and must be in slapd.conf format. Include files were commonly used to load schema specifications. While they are still supported, their use is deprecated. Include entries must have the {{EX:olcIncludeFile}} objectClass. H4: olcInclude: <filename> This directive specifies that slapd should read additional configuration information from the given file. Note: You should be careful when using this directive - there is no small limit on the number of nested include directives, and no loop detection is done. H4: Sample Entries >dn: cn=include{0},cn=config >objectClass: olcIncludeFile >cn: include{0} >olcInclude: ./schema/core.schema > >dn: cn=include{1},cn=config >objectClass: olcIncludeFile >cn: include{1} >olcInclude: ./schema/cosine.schema H3: cn=module If support for dynamically loaded modules was enabled when configuring slapd, {{EX:cn=module}} entries may be used to specify sets of modules to load. Module entries must have the {{EX:olcModuleList}} objectClass. H4: olcModuleLoad: <filename> Specify the name of a dynamically loadable module to load. The filename may be an absolute path name or a simple filename. Non-absolute names are searched for in the directories specified by the {{EX:olcModulePath}} directive. H4: 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. H4: Sample Entries >dn: cn=module{0},cn=config >objectClass: olcModuleList >cn: module{0} >olcModuleLoad: /usr/local/lib/smbk5pwd.la > >dn: cn=module{1},cn=config >objectClass: olcModuleList >cn: module{1} >olcModulePath: /usr/local/lib:/usr/local/lib/slapd >olcModuleLoad: accesslog.la >olcModuleLoad: pcache.la H3: cn=schema The cn=schema entry holds all of the schema definitions that are hard-coded in slapd. As such, the values in this entry are generated by slapd so no schema values need to be provided in the config file. The entry must still be defined though, to serve as a base for the user-defined schema to add in underneath. Schema entries must have the {{EX:olcSchemaConfig}} objectClass. H4: olcAttributeTypes: <{{REF:RFC2252}} Attribute Type Description> This directive defines an attribute type. Please see the {{SECT:Schema Specification}} chapter for information regarding how to use this directive. H4: olcObjectClasses: <{{REF:RFC2252}} Object Class Description> This directive defines an object class. Please see the {{SECT:Schema Specification}} chapter for information regarding how to use this directive. H4: Sample Entries >dn: cn=schema,cn=config >objectClass: olcSchemaConfig >cn: schema > >dn: cn=test,cn=schema,cn=config >objectClass: olcSchemaConfig >cn: test >olcAttributeTypes: ( 1.1.1 > NAME 'testAttr' > EQUALITY integerMatch > SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 ) >olcAttributeTypes: ( 1.1.2 NAME 'testTwo' EQUALITY caseIgnoreMatch > SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.44 ) >olcObjectClasses: ( 1.1.3 NAME 'testObject' > MAY ( testAttr $ testTwo ) AUXILIARY ) H3: Backend-specific Directives Backend directives apply to all database instances of the same type and, depending on the directive, may be overridden by database directives. Backend entries must have the {{EX:olcBackendConfig}} objectClass. H4: olcBackend: <type> This directive names a backend-specific configuration entry. {{EX:<type>}} should be one of the supported backend types listed in Table 5.2. !block table; align=Center; coltags="EX,N"; \ title="Table 5.2: Database Backends" Types Description bdb Berkeley DB transactional backend config Slapd configuration backend dnssrv DNS SRV backend hdb Hierarchical variant of bdb backend ldap Lightweight Directory Access Protocol (Proxy) backend ldbm Lightweight DBM backend ldif Lightweight Data Interchange Format backend meta Meta Directory backend monitor Monitor backend passwd Provides read-only access to {{passwd}}(5) perl Perl Programmable backend shell Shell (extern program) backend sql SQL Programmable backend !endblock \Example: > olcBackend: bdb There are no other directives defined for this entry. Specific backend types may define additional attributes for their particular use but so far none have ever been defined. As such, these directives usually do not appear in any actual configurations. H4: Sample Entry > dn: olcBackend=bdb,cn=config > objectClass: olcBackendConfig > olcBackend: bdb H3: Database-specific Directives Directives in this section are supported by every type of database. Database entries must have the {{EX:olcDatabaseConfig}} objectClass. H4: olcDatabase: [{<index>}]<type> This directive names a specific database instance. The numeric {<index>} may be provided to distinguish multiple databases of the same type. Usually the index can be omitted, and slapd will generate it automatically. {{EX:<type>}} should be one of the supported backend types listed in Table 5.2 or the {{EX:frontend}} type. The {{EX:frontend}} is a special database that is used to hold database-level options that should be applied to all the other databases. Subsequent database definitions may also override some frontend settings. The {{EX:config}} database is also special; both the {{EX:config}} and the {{EX:frontend}} databases are always created implicitly even if they are not explicitly configured, and they are created before any other databases. \Example: > olcDatabase: bdb This marks the beginning of a new {{TERM:BDB}} database instance. H4: olcAccess: to <what> [ by <who> <accesslevel> <control> ]+ This directive grants access (specified by <accesslevel>) to a set of entries and/or attributes (specified by <what>) by one or more requesters (specified by <who>). See the {{SECT:Access Control}} section of this chapter for a summary of basic usage. !if 0 More detailed discussion of this directive can be found in the {{SECT:Advanced Access Control}} chapter. !endif Note: If no {{EX:olcAccess}} directives are specified, the default access control policy, {{EX:to * by * read}}, allows all users (both authenticated and anonymous) read access. Note: Access controls defined in the frontend are appended to all other databases' controls. H4: olcReadonly { TRUE | FALSE } This directive puts the database into "read-only" mode. Any attempts to modify the database will return an "unwilling to perform" error. \Default: > olcReadonly: FALSE H4: olcReplica > olcReplica: uri=ldap[s]://<hostname>[:<port>] | host=<hostname>[:<port>] > [bindmethod={simple|sasl}] > ["binddn=<DN>"] > [saslmech=<mech>] > [authcid=<identity>] > [authzid=<identity>] > [credentials=<password>] This directive specifies a replication site for this database for use with slurpd. The {{EX:uri=}} parameter specifies a scheme, a host and optionally a port where the slave slapd instance can be found. Either a domain name or IP address may be used for <hostname>. If <port> is not given, the standard LDAP port number (389 or 636) is used. {{EX:host}} is deprecated in favor of the {{EX:uri}} parameter. {{EX:uri}} allows the replica LDAP server to be specified as an LDAP URI such as {{EX:ldap://slave.example.com:389}} or {{EX:ldaps://slave.example.com:636}}. The {{EX:binddn=}} parameter gives the DN to bind as for updates to the slave slapd. It should be a DN which has read/write access to the slave slapd's database. It must also match the {{EX:updatedn}} directive in the slave slapd's config file. Generally, this DN {{should not}} be the same as the {{EX:rootdn}} of the master database. Since DNs are likely to contain embedded spaces, the entire {{EX:"binddn=<DN>"}} string should be enclosed in double quotes. The {{EX:bindmethod}} is {{EX:simple}} or {{EX:sasl}}, depending on whether simple password-based authentication or {{TERM:SASL}} authentication is to be used when connecting to the slave slapd. Simple authentication should not be used unless adequate data integrity and confidentiality protections are in place (e.g. TLS or IPSEC). Simple authentication requires specification of {{EX:binddn}} and {{EX:credentials}} parameters. SASL authentication is generally recommended. SASL authentication requires specification of a mechanism using the {{EX:saslmech}} parameter. Depending on the mechanism, an authentication identity and/or credentials can be specified using {{EX:authcid}} and {{EX:credentials}} respectively. The {{EX:authzid}} parameter may be used to specify an authorization identity. See the chapter entitled {{SECT:Replication with slurpd}} for more information on how to use this directive. H4: olcReplogfile: <filename> This directive specifies the name of the replication log file to which slapd will log changes. The replication log is typically written by slapd and read by slurpd. Normally, this directive is only used if slurpd is being used to replicate the database. However, you can also use it to generate a transaction log, if slurpd is not running. In this case, you will need to periodically truncate the file, since it will grow indefinitely otherwise. See the chapter entitled {{SECT:Replication with slurpd}} for more information on how to use this directive. H4: olcRootDN: <DN> This directive specifies the DN that is not subject to access control or administrative limit restrictions for operations on this database. The DN need not refer to an entry in this database or even in the directory. The DN may refer to a SASL identity. Entry-based Example: > olcRootDN: "cn=Manager,dc=example,dc=com" SASL-based Example: > olcRootDN: "uid=root,cn=example.com,cn=digest-md5,cn=auth" See the {{SECT:SASL Authentication}} section for information on SASL authentication identities. H4: olcRootPW: <password> This directive can be used to specify a password for the DN for the rootdn (when the rootdn is set to a DN within the database). \Example: > olcRootPW: secret It is also permissible to provide a hash of the password in RFC 2307 form. {{slappasswd}}(8) may be used to generate the password hash. \Example: > olcRootPW: {SSHA}ZKKuqbEKJfKSXhUbHG3fG8MDn9j1v4QN The hash was generated using the command {{EX:slappasswd -s secret}}. H4: olcSizeLimit: <integer> This directive specifies the maximum number of entries to return from a search operation. \Default: > olcSizeLimit: 500 H4: olcSuffix: <dn suffix> This directive specifies the DN suffix of queries that will be passed to this backend database. Multiple suffix lines can be given, and usually at least one is required for each database definition. (Some backend types, such as {{EX:frontend}} and {{EX:monitor}} use a hard-coded suffix which may not be overridden in the configuration.) \Example: > olcSuffix: "dc=example,dc=com" Queries with a DN ending in "dc=example,dc=com" will be passed to this backend. Note: When the backend to pass a query to is selected, slapd looks at the suffix value(s) in each database definition in the order in which they were configured. Thus, if one database suffix is a prefix of another, it must appear after it in the configuration. H4: olcSyncrepl > olcSyncrepl: rid=<replica ID> > provider=ldap[s]://<hostname>[:port] > [type=refreshOnly|refreshAndPersist] > [interval=dd:hh:mm:ss] > [retry=[<retry interval> <# of retries>]+] > [searchbase=<base DN>] > [filter=<filter str>] > [scope=sub|one|base] > [attrs=<attr list>] > [attrsonly] > [sizelimit=<limit>] > [timelimit=<limit>] > [schemachecking=on|off] > [bindmethod=simple|sasl] > [binddn=<DN>] > [saslmech=<mech>] > [authcid=<identity>] > [authzid=<identity>] > [credentials=<passwd>] > [realm=<realm>] > [secprops=<properties>] This directive specifies the current database as a replica of the master content by establishing the current {{slapd}}(8) as a replication consumer site running a syncrepl replication engine. The master database is located at the replication provider site specified by the {{EX:provider}} parameter. The replica database is kept up-to-date with the master content using the LDAP Content Synchronization protocol. See {{EX:draft-zeilenga-ldup-sync-xx.txt}} ({{a work in progress}}) for more information on the protocol. The {{EX:rid}} parameter is used for identification of the current {{EX:syncrepl}} directive within the replication consumer server, where {{EX:<replica ID>}} uniquely identifies the syncrepl specification described by the current {{EX:syncrepl}} directive. {{EX:<replica ID>}} is non-negative and is no more than three decimal digits in length. The {{EX:provider}} parameter specifies the replication provider site containing the master content as an LDAP URI. The {{EX:provider}} parameter specifies a scheme, a host and optionally a port where the provider slapd instance can be found. Either a domain name or IP address may be used for <hostname>. Examples are {{EX:ldap://provider.example.com:389}} or {{EX:ldaps://192.168.1.1:636}}. If <port> is not given, the standard LDAP port number (389 or 636) is used. Note that the syncrepl uses a consumer-initiated protocol, and hence its specification is located at the consumer site, whereas the {{EX:replica}} specification is located at the provider site. {{EX:syncrepl}} and {{EX:replica}} directives define two independent replication mechanisms. They do not represent the replication peers of each other. The content of the syncrepl replica is defined using a search specification as its result set. The consumer slapd will send search requests to the provider slapd according to the search specification. The search specification includes {{EX:searchbase}}, {{EX:scope}}, {{EX:filter}}, {{EX:attrs}}, {{EX:attrsonly}}, {{EX:sizelimit}}, and {{EX:timelimit}} parameters as in the normal search specification. The {{EX:searchbase}} parameter has no default value and must always be specified. The {{EX:scope}} defaults to {{EX:sub}}, the {{EX:filter}} defaults to {{EX:(objectclass=*)}}, {{EX:attrs}} defaults to {{EX:"*,+"}} to replicate all user and operational attributes, and {{EX:attrsonly}} is unset by default. Both {{EX:sizelimit}} and {{EX:timelimit}} default to "unlimited", and only positive integers or "unlimited" may be specified. The LDAP Content Synchronization protocol has two operation types: {{EX:refreshOnly}} and {{EX:refreshAndPersist}}. The operation type is specified by the {{EX:type}} parameter. In the {{EX:refreshOnly}} operation, the next synchronization search operation is periodically rescheduled at an interval time after each synchronization operation finishes. The interval is specified by the {{EX:interval}} parameter. It is set to one day by default. In the {{EX:refreshAndPersist}} operation, a synchronization search remains persistent in the provider slapd. Further updates to the master replica will generate {{EX:searchResultEntry}} to the consumer slapd as the search responses to the persistent synchronization search. If an error occurs during replication, the consumer will attempt to reconnect according to the retry parameter which is a list of the <retry interval> and <# of retries> pairs. For example, retry="60 10 300 3" lets the consumer retry every 60 seconds for the first 10 times and then retry every 300 seconds for the next three times before stop retrying. + in <# of retries> means indefinite number of retries until success. The schema checking can be enforced at the LDAP Sync consumer site by turning on the {{EX:schemachecking}} parameter. If it is turned on, every replicated entry will be checked for its schema as the entry is stored into the replica content. Every entry in the replica should contain those attributes required by the schema definition. If it is turned off, entries will be stored without checking schema conformance. The default is off. The {{EX:binddn}} parameter gives the DN to bind as for the syncrepl searches to the provider slapd. It should be a DN which has read access to the replication content in the master database. The {{EX:bindmethod}} is {{EX:simple}} or {{EX:sasl}}, depending on whether simple password-based authentication or {{TERM:SASL}} authentication is to be used when connecting to the provider slapd. Simple authentication should not be used unless adequate data integrity and confidentiality protections are in place (e.g. TLS or IPSEC). Simple authentication requires specification of {{EX:binddn}} and {{EX:credentials}} parameters. SASL authentication is generally recommended. SASL authentication requires specification of a mechanism using the {{EX:saslmech}} parameter. Depending on the mechanism, an authentication identity and/or credentials can be specified using {{EX:authcid}} and {{EX:credentials}}, respectively. The {{EX:authzid}} parameter may be used to specify an authorization identity. The {{EX:realm}} parameter specifies a realm which a certain mechanisms authenticate the identity within. The {{EX:secprops}} parameter specifies Cyrus SASL security properties. The syncrepl replication mechanism is supported by the three native backends: back-bdb, back-hdb, and back-ldbm. See the {{SECT:LDAP Sync Replication}} chapter of the admin guide for more information on how to use this directive. H4: olcTimeLimit: <integer> This directive specifies the maximum number of seconds (in real time) slapd will spend answering a search request. If a request is not finished in this time, a result indicating an exceeded timelimit will be returned. \Default: > olcTimeLimit: 3600 H4: olcUpdateDN: <DN> This directive is only applicable in a slave slapd. It specifies the DN allowed to make changes to the replica. This may be the DN {{slurpd}}(8) binds as when making changes to the replica or the DN associated with a SASL identity. Entry-based Example: > olcUpdateDN: "cn=Update Daemon,dc=example,dc=com" SASL-based Example: > olcUpdateDN: "uid=slurpd,cn=example.com,cn=digest-md5,cn=auth" See the {{SECT:Replication with slurpd}} chapter for more information on how to use this directive. H4: olcUpdateref: <URL> This directive is only applicable in a slave slapd. It specifies the URL to return to clients which submit update requests upon the replica. If specified multiple times, each {{TERM:URL}} is provided. \Example: > olcUpdateref: ldap://master.example.net H4: Sample Entries >dn: olcDatabase=frontend,cn=config >objectClass: olcDatabaseConfig >objectClass: olcFrontendConfig >olcDatabase: frontend >olcReadOnly: FALSE > >dn: olcDatabase=config,cn=config >objectClass: olcDatabaseConfig >olcDatabase: config >olcRootDN: cn=Manager,dc=example,dc=com H3: BDB and HDB Database Directives Directives in this category apply to both the {{TERM:BDB}} and the {{TERM:HDB}} database. They are used in an olcDatabase entry in addition to the generic database directives defined above. For a complete reference of BDB/HDB configuration directives, see {{slapd-bdb}}(5). In addition to the {{EX:olcDatabaseConfig}} objectClass, BDB and HDB database entries must have the {{EX:olcBdbConfig}} and {{EX:olcHdbConfig}} objectClass, respectively. H4: olcDbDirectory: <directory> This directive specifies the directory where the BDB files containing the database and associated indices live. \Default: > olcDbDirectory: /usr/local/var/openldap-data H4: olcDbCachesize: <integer> This directive specifies the size in entries of the in-memory cache maintained by the BDB backend database instance. \Default: > olcDbCachesize: 1000 H4: olcDbCheckpoint: <kbyte> <min> This directive specifies how often to checkpoint the BDB transaction log. A checkpoint operation flushes the database buffers to disk and writes a checkpoint record in the log. The checkpoint will occur if either <kbyte> data has been written or <min> minutes have passed since the last checkpont. Both arguments default to zero, in which case they are ignored. When the <min> argument is non-zero, an internal task will run every <min> minutes to perform the checkpoint. See the Berkeley DB reference guide for more details. \Example: > olcDbCheckpoint: 1024 10 H4: olcDbConfig: <DB_CONFIG setting> This attribute specifies a configuration directive to be placed in the {{EX:DB_CONFIG}} file of the database directory. At server startup time, if no such file exists yet, the {{EX:DB_CONFIG}} file will be created and the settings in this attribute will be written to it. If the file exists, its contents will be read and displayed in this attribute. The attribute is multi-valued, to accomodate multiple configuration directives. No default is provided, but it is essential to use proper settings here to get the best server performance. \Example: > olcDbConfig: set_cachesize 0 10485760 0 > olcDbConfig: set_lg_bsize 2097512 > olcDbConfig: set_lg_dir /var/tmp/bdb-log > olcDbConfig: set_flags DB_LOG_AUTOREMOVE In this example, the BDB cache is set to 10MB, the BDB transaction log buffer size is set to 2MB, and the transaction log files are to be stored in the /var/tmp/bdb-log directory. Also a flag is set to tell BDB to delete transaction log files as soon as their contents have been checkpointed and they are no longer needed. Without this setting the transaction log files will continue to accumulate until some other cleanup procedure removes them. See the SleepyCat documentation for the {{EX:db_archive}} command for details. Ideally the BDB cache must be at least as large as the working set of the database, the log buffer size should be large enough to accomodate most transactions without overflowing, and the log directory must be on a separate physical disk from the main database files. And both the database directory and the log directory should be separate from disks used for regular system activities such as the root, boot, or swap filesystems. See the FAQ-o-Matic and the SleepyCat documentation for more details. H4: olcDbNosync: { TRUE | FALSE } This option causes on-disk database contents to not be immediately synchronized with in memory changes upon change. Setting this option to {{EX:TRUE}} may improve performance at the expense of data integrity. This directive has the same effect as using > olcDbConfig: set_flags DB_TXN_NOSYNC H4: olcDbIDLcacheSize: <integer> Specify the size of the in-memory index cache, in index slots. The default is zero. A larger value will speed up frequent searches of indexed entries. The optimal size will depend on the data and search characteristics of the database, but using a number three times the entry cache size is a good starting point. \Example: > olcDbIDLcacheSize: 3000 H4: olcDbIndex: {<attrlist> | default} [pres,eq,approx,sub,none] This directive specifies the indices to maintain for the given attribute. If only an {{EX:<attrlist>}} is given, the default indices are maintained. \Example: > olcDbIndex: default pres,eq > olcDbIndex: uid > olcDbIndex: cn,sn pres,eq,sub > olcDbIndex: objectClass eq The first line sets the default set of indices to maintain to present and equality. The second line causes the default (pres,eq) set of indices to be maintained for the {{EX:uid}} attribute type. The third line causes present, equality, and substring indices to be maintained for {{EX:cn}} and {{EX:sn}} attribute types. The fourth line causes an equality index for the {{EX:objectClass}} attribute type. By default, no indices are maintained. It is generally advised that minimally an equality index upon objectClass be maintained. > olcDbindex: objectClass eq If this setting is changed while slapd is running, an internal task will be run to generate the changed index data. All server operations can continue as normal while the indexer does its work. If slapd is stopped before the index task completes, indexing will have to be manually completed using the slapindex tool. H4: olcDbLinearIndex: { TRUE | FALSE } If this setting is {{EX:TRUE}} slapindex will index one attribute at a time. The default settings is {{EX:FALSE}} in which case all indexed attributes of an entry are processed at the same time. When enabled, each indexed attribute is processed individually, using multiple passes through the entire database. This option improves slapindex performance when the database size exceeds the BDB cache size. When the BDB cache is large enough, this option is not needed and will decrease performance. Also by default, slapadd performs full indexing and so a separate slapindex run is not needed. With this option, slapadd does no indexing and slapindex must be used. H4: olcDbMode: <integer> This directive specifies the file protection mode that newly created database index files should have. \Default: > olcDbMode: 0600 H4: olcDbSearchStack: <integer> Specify the depth of the stack used for search filter evaluation. Search filters are evaluated on a stack to accomodate nested {{EX:AND}} / {{EX:OR}} clauses. An individual stack is allocated for each server thread. The depth of the stack determines how complex a filter can be evaluated without requiring any additional memory allocation. Filters that are nested deeper than the search stack depth will cause a separate stack to be allocated for that particular search operation. These separate allocations can have a major negative impact on server performance, but specifying too much stack will also consume a great deal of memory. Each search uses 512K bytes per level on a 32-bit machine, or 1024K bytes per level on a 64-bit machine. The default stack depth is 16, thus 8MB or 16MB per thread is used on 32 and 64 bit machines, respectively. Also the 512KB size of a single stack slot is set by a compile-time constant which may be changed if needed; the code must be recompiled for the change to take effect. \Default: > olcDbSearchStack: 16 H4: olcDbShmKey: <integer> Specify a key for a shared memory BDB environment. By default the BDB environment uses memory mapped files. If a non-zero value is specified, it will be used as the key to identify a shared memory region that will house the environment. \Example: > olcDbShmKey: 42 H4: Sample Entry >dn: olcDatabase=hdb,cn=config >objectClass: olcDatabaseConfig >objectClass: olcHdbConfig >olcDatabase: hdb >olcSuffix: "dc=example,dc=com" >olcDbDirectory: /usr/local/var/openldap-data >olcDbCacheSize: 1000 >olcDbCheckpoint: 1024 10 >olcDbConfig: set_cachesize 0 10485760 0 >olcDbConfig: set_lg_bsize 2097152 >olcDbConfig: set_lg_dir /var/tmp/bdb-log >olcDbConfig: set_flags DB_LOG_AUTOREMOVE >olcDbIDLcacheSize: 3000 >olcDbIndex: objectClass eq H2: Access Control Access to slapd entries and attributes is controlled by the olcAccess attribute, whose values are a sequence of access directives. The general form of the olcAccess configuration is: > olcAccess: <access directive> > <access directive> ::= to <what> > [by <who> <access> <control>]+ > <what> ::= * | > [dn[.<basic-style>]=<regex> | dn.<scope-style>=<DN>] > [filter=<ldapfilter>] [attrs=<attrlist>] > <basic-style> ::= regex | exact > <scope-style> ::= base | one | subtree | children > <attrlist> ::= <attr> [val[.<basic-style>]=<regex>] | <attr> , <attrlist> > <attr> ::= <attrname> | entry | children > <who> ::= * | [anonymous | users | self > | dn[.<basic-style>]=<regex> | dn.<scope-style>=<DN>] > [dnattr=<attrname>] > [group[/<objectclass>[/<attrname>][.<basic-style>]]=<regex>] > [peername[.<basic-style>]=<regex>] > [sockname[.<basic-style>]=<regex>] > [domain[.<basic-style>]=<regex>] > [sockurl[.<basic-style>]=<regex>] > [set=<setspec>] > [aci=<attrname>] > <access> ::= [self]{<level>|<priv>} > <level> ::= none | auth | compare | search | read | write > <priv> ::= {=|+|-}{w|r|s|c|x|0}+ > <control> ::= [stop | continue | break] where the <what> part selects the entries and/or attributes to which the access applies, the {{EX:<who>}} part specifies which entities are granted access, and the {{EX:<access>}} part specifies the access granted. Multiple {{EX:<who> <access> <control>}} triplets are supported, allowing many entities to be granted different access to the same set of entries and attributes. Not all of these access control options are described here; for more details see the {{slapd.access}}(5) man page. H3: What to control access to The <what> part of an access specification determines the entries and attributes to which the access control applies. Entries are commonly selected in two ways: by DN and by filter. The following qualifiers select entries by DN: > to * > to dn[.<basic-style>]=<regex> > to dn.<scope-style>=<DN> The first form is used to select all entries. The second form may be used to select entries by matching a regular expression against the target entry's {{normalized DN}}. (The second form is not discussed further in this document.) The third form is used to select entries which are within the requested scope of DN. The <DN> is a string representation of the Distinguished Name, as described in {{REF:RFC2253}}. The scope can be either {{EX:base}}, {{EX:one}}, {{EX:subtree}}, or {{EX:children}}. Where {{EX:base}} matches only the entry with provided DN, {{EX:one}} matches the entries whose parent is the provided DN, {{EX:subtree}} matches all entries in the subtree whose root is the provided DN, and {{EX:children}} matches all entries under the DN (but not the entry named by the DN). For example, if the directory contained entries named: > 0: o=suffix > 1: cn=Manager,o=suffix > 2: ou=people,o=suffix > 3: uid=kdz,ou=people,o=suffix > 4: cn=addresses,uid=kdz,ou=people,o=suffix > 5: uid=hyc,ou=people,o=suffix \Then: . {{EX:dn.base="ou=people,o=suffix"}} match 2; . {{EX:dn.one="ou=people,o=suffix"}} match 3, and 5; . {{EX:dn.subtree="ou=people,o=suffix"}} match 2, 3, 4, and 5; and . {{EX:dn.children="ou=people,o=suffix"}} match 3, 4, and 5. Entries may also be selected using a filter: > to filter=<ldap filter> where <ldap filter> is a string representation of an LDAP search filter, as described in {{REF:RFC2254}}. For example: > to filter=(objectClass=person) Note that entries may be selected by both DN and filter by including both qualifiers in the <what> clause. > to dn.one="ou=people,o=suffix" filter=(objectClass=person) Attributes within an entry are selected by including a comma-separated list of attribute names in the <what> selector: > attrs=<attribute list> A specific value of an attribute is selected by using a single attribute name and also using a value selector: > attrs=<attribute> val[.<style>]=<regex> There are two special {{pseudo}} attributes {{EX:entry}} and {{EX:children}}. To read (and hence return) a target entry, the subject must have {{EX:read}} access to the target's {{entry}} attribute. To add or delete an entry, the subject must have {{EX:write}} access to the entry's {{EX:entry}} attribute AND must have {{EX:write}} access to the entry's parent's {{EX:children}} attribute. To rename an entry, the subject must have {{EX:write}} access to entry's {{EX:entry}} attribute AND have {{EX:write}} access to both the old parent's and new parent's {{EX:children}} attributes. The complete examples at the end of this section should help clear things up. Lastly, there is a special entry selector {{EX:"*"}} that is used to select any entry. It is used when no other {{EX:<what>}} selector has been provided. It's equivalent to "{{EX:dn=.*}}" H3: Who to grant access to The <who> part identifies the entity or entities being granted access. Note that access is granted to "entities" not "entries." The following table summarizes entity specifiers: !block table; align=Center; coltags="EX,N"; \ title="Table 5.3: Access Entity Specifiers" Specifier|Entities *|All, including anonymous and authenticated users anonymous|Anonymous (non-authenticated) users users|Authenticated users self|User associated with target entry dn[.<basic-style>]=<regex>|Users matching a regular expression dn.<scope-style>=<DN>|Users within scope of a DN !endblock The DN specifier behaves much like <what> clause DN specifiers. Other control factors are also supported. For example, a {{EX:<who>}} can be restricted by an entry listed in a DN-valued attribute in the entry to which the access applies: > dnattr=<dn-valued attribute name> The dnattr specification is used to give access to an entry whose DN is listed in an attribute of the entry (e.g., give access to a group entry to whoever is listed as the owner of the group entry). Some factors may not be appropriate in all environments (or any). For example, the domain factor relies on IP to domain name lookups. As these can easily spoofed, the domain factor should not be avoided. H3: The access to grant The kind of <access> granted can be one of the following: !block table; colaligns="LRL"; coltags="EX,EX,N"; align=Center; \ title="Table 5.4: Access Levels" Level Privileges Description none =0 no access auth =x needed to bind compare =cx needed to compare search =scx needed to apply search filters read =rscx needed to read search results write =wrscx needed to modify/rename !endblock Each level implies all lower levels of access. So, for example, granting someone {{EX:write}} access to an entry also grants them {{EX:read}}, {{EX:search}}, {{EX:compare}}, and {{EX:auth}} access. However, one may use the privileges specifier to grant specific permissions. H3: Access Control Evaluation When evaluating whether some requester should be given access to an entry and/or attribute, slapd compares the entry and/or attribute to the {{EX:<what>}} selectors given in the configuration. For each entry, access controls provided in the database which holds the entry (or the first database if not held in any database) apply first, followed by the global access directives (which are held in the {{EX:frontend}} database definition). Within this priority, access directives are examined in the order in which they appear in the configuration attribute. Slapd stops with the first {{EX:<what>}} selector that matches the entry and/or attribute. The corresponding access directive is the one slapd will use to evaluate access. Next, slapd compares the entity requesting access to the {{EX:<who>}} selectors within the access directive selected above in the order in which they appear. It stops with the first {{EX:<who>}} selector that matches the requester. This determines the access the entity requesting access has to the entry and/or attribute. Finally, slapd compares the access granted in the selected {{EX:<access>}} clause to the access requested by the client. If it allows greater or equal access, access is granted. Otherwise, access is denied. The order of evaluation of access directives makes their placement in the configuration file important. If one access directive is more specific than another in terms of the entries it selects, it should appear first in the configuration. Similarly, if one {{EX:<who>}} selector is more specific than another it should come first in the access directive. The access control examples given below should help make this clear. H3: Access Control Examples The access control facility described above is quite powerful. This section shows some examples of its use for descriptive purposes. A simple example: > olcAccess: to * by * read This access directive grants read access to everyone. > olcAccess: to * > by self write > by anonymous auth > by * read This directive allows the user to modify their entry, allows anonymous to authenticate against these entries, and allows all others to read these entries. Note that only the first {{EX:by <who>}} clause which matches applies. Hence, the anonymous users are granted {{EX:auth}}, not {{EX:read}}. The last clause could just as well have been "{{EX:by users read}}". It is often desirable to restrict operations based upon the level of protection in place. The following shows how security strength factors (SSF) can be used. > olcAccess: to * > by ssf=128 self write > by ssf=64 anonymous auth > by ssf=64 users read This directive allows users to modify their own entries if security protections of strength 128 or better have been established, allows authentication access to anonymous users, and read access when strength 64 or better security protections have been established. If the client has not establish sufficient security protections, the implicit {{EX:by * none}} clause would be applied. The following example shows the use of style specifiers to select the entries by DN in two access directives where ordering is significant. > olcAccess: to dn.children="dc=example,dc=com" > by * search > olcAccess: to dn.children="dc=com" > by * read Read access is granted to entries under the {{EX:dc=com}} subtree, except for those entries under the {{EX:dc=example,dc=com}} subtree, to which search access is granted. No access is granted to {{EX:dc=com}} as neither access directive matches this DN. If the order of these access directives was reversed, the trailing directive would never be reached, since all entries under {{EX:dc=example,dc=com}} are also under {{EX:dc=com}} entries. Also note that if no {{EX:olcAccess: to}} directive matches or no {{EX:by <who>}} clause, {{B:access is denied}}. That is, every {{EX:olcAccess: to}} directive ends with an implicit {{EX:by * none}} clause and every access list ends with an implicit {{EX:olcAccess: to * by * none}} directive. The next example again shows the importance of ordering, both of the access directives and the {{EX:by <who>}} clauses. It also shows the use of an attribute selector to grant access to a specific attribute and various {{EX:<who>}} selectors. > olcAccess: to dn.subtree="dc=example,dc=com" attr=homePhone > by self write > by dn.children=dc=example,dc=com" search > by peername.regex=IP:10\..+ read > olcAccess: to dn.subtree="dc=example,dc=com" > by self write > by dn.children="dc=example,dc=com" search > by anonymous auth This example applies to entries in the "{{EX:dc=example,dc=com}}" subtree. To all attributes except {{EX:homePhone}}, an entry can write to itself, entries under {{EX:example.com}} entries can search by them, anybody else has no access (implicit {{EX:by * none}}) excepting for authentication/authorization (which is always done anonymously). The {{EX:homePhone}} attribute is writable by the entry, searchable by entries under {{EX:example.com}}, readable by clients connecting from network 10, and otherwise not readable (implicit {{EX:by * none}}). All other access is denied by the implicit {{EX:access to * by * none}}. Sometimes it is useful to permit a particular DN to add or remove itself from an attribute. For example, if you would like to create a group and allow people to add and remove only their own DN from the member attribute, you could accomplish it with an access directive like this: > olcAccess: to attr=member,entry > by dnattr=member selfwrite The dnattr {{EX:<who>}} selector says that the access applies to entries listed in the {{EX:member}} attribute. The {{EX:selfwrite}} access selector says that such members can only add or delete their own DN from the attribute, not other values. The addition of the entry attribute is required because access to the entry is required to access any of the entry's attributes. H3: Access Control Ordering Since the ordering of {{EX:olcAccess}} directives is essential to their proper evaluation, but LDAP attributes normally do not preserve the ordering of their values, OpenLDAP uses a custom schema extension to maintain a fixed ordering of these values. This ordering is maintained by prepending a {{EX:"{X}"}} numeric index to each value, similarly to the approach used for ordering the configuration entries. These index tags are maintained automatically by slapd and do not need to be specified when originally defining the values. For example, when you create the settings > olcAccess: to attr=member,entry > by dnattr=member selfwrite > olcAccess: to dn.children="dc=example,dc=com" > by * search > olcAccess: to dn.children="dc=com" > by * read when you read them back using slapcat or ldapsearch they will contain > olcAccess: {0}to attr=member,entry > by dnattr=member selfwrite > olcAccess: {1}to dn.children="dc=example,dc=com" > by * search > olcAccess: {2}to dn.children="dc=com" > by * read The numeric index may be used to specify a particular value to change when using ldapmodify to edit the access rules. This index can be used instead of (or in addition to) the actual access value. Using this numeric index is very helpful when multiple access rules are being managed. For example, if we needed to change the second rule above to grant write access instead of search, we could try this LDIF: > changetype: modify > delete: olcAccess > olcAccess: to dn.children="dc=example,dc=com" by * search > - > add: olcAccess > olcAccess: to dn.children="dc=example,dc=com" by * write > - But this example {{B:will not}} guarantee that the existing values remain in their original order, so it will most likely yield a broken security configuration. Instead, the numeric index should be used: > changetype: modify > delete: olcAccess > olcAccess: {1} > - > add: olcAccess > olcAccess: {1}to dn.children="dc=example,dc=com" by * write > - This example deletes whatever rule is in value #1 of the {{EX:olcAccess}} attribute (regardless of its value) and adds a new value that is explicitly inserted as value #1. The result will be > olcAccess: {0}to attr=member,entry > by dnattr=member selfwrite > olcAccess: {1}to dn.children="dc=example,dc=com" > by * write > olcAccess: {2}to dn.children="dc=com" > by * read which is exactly what was intended. !if 0 For more details on how to use the {{EX:access}} directive, consult the {{Advanced Access Control}} chapter. !endif H2: Configuration Example The following is an example configuration, interspersed with explanatory text. It defines two databases to handle different parts of the {{TERM:X.500}} tree; both are {{TERM:BDB}} database instances. The line numbers shown are provided for reference only and are not included in the actual file. First, the global configuration section: E: 1. # example config file - global configuration entry E: 2. dn: cn=config E: 3. objectClass: olcGlobal E: 4. cn: config E: 5. olcReferral: ldap://root.openldap.org E: 6. Line 1 is a comment. Lines 2-4 identify this as the global configuration entry. The {{EX:olcReferral:}} directive on line 5 means that queries not local to one of the databases defined below will be referred to the LDAP server running on the standard port (389) at the host {{EX:root.openldap.org}}. Line 6 is a blank line, indicating the end of this entry. E: 7. # internal schema E: 8. dn: cn=schema,cn=config E: 9. objectClass: olcSchemaConfig E: 10. cn: schema E: 11. Line 7 is a comment. Lines 8-10 identify this as the root of the schema subtree. The actual schema definitions in this entry are hardcoded into slapd so no additional attributes are specified here. Line 11 is a blank line, indicating the end of this entry. E: 12. # include the core schema E: 13. include: file:///usr/local/etc/openldap/schema/core.ldif E: 14. Line 12 is a comment. Line 13 is an LDIF include directive which accesses the {{core}} schema definitions in LDIF format. Line 14 is a blank line. Next comes the database definitions. The first database is the special {{EX:frontend}} database whose settings are applied globally to all the other databases. E: 15. # global database parameters E: 16. dn: olcDatabase=frontend,cn=config E: 17. objectClass: olcDatabaseConfig E: 18. olcDatabase: frontend E: 19. olcAccess: to * by * read E: 20. Line 15 is a comment. Lines 16-18 identify this entry as the global database entry. Line 19 is a global access control. It applies to all entries (after any applicable database-specific access controls). The next entry defines a BDB backend that will handle queries for things in the "dc=example,dc=com" portion of the tree. Indices are to be maintained for several attributes, and the {{EX:userPassword}} attribute is to be protected from unauthorized access. E: 21. # BDB definition for example.com E: 22. dn: olcDatabase=bdb,cn=config E: 23. objectClass: olcDatabaseConfig E: 24. objectClass: olcBdbConfig E: 25. olcDatabase: bdb E: 26. olcSuffix: "dc=example,dc=com" E: 27. olcDbDirectory: /usr/local/var/openldap-data E: 28. olcRootDN: "cn=Manager,dc=example,dc=com" E: 29. olcRootPW: secret E: 30. olcDbIndex: uid pres,eq E: 31. olcDbIndex: cn,sn,uid pres,eq,approx,sub E: 32. olcDbIndex: objectClass eq E: 33. olcAccess: to attr=userPassword E: 34. by self write E: 35. by anonymous auth E: 36. by dn.base="cn=Admin,dc=example,dc=com" write E: 37. by * none E: 38. olcAccess: to * E: 39. by self write E: 40. by dn.base="cn=Admin,dc=example,dc=com" write E: 41. by * read E: 42. Line 21 is a comment. Lines 22-25 identify this entry as a BDB database configuration entry. Line 26 specifies the DN suffix for queries to pass to this database. Line 27 specifies the directory in which the database files will live. Lines 28 and 29 identify the database {{super-user}} entry and associated password. This entry is not subject to access control or size or time limit restrictions. Lines 30 through 32 indicate the indices to maintain for various attributes. Lines 33 through 41 specify access control for entries in this database. As this is the first database, the controls also apply to entries not held in any database (such as the Root DSE). For all applicable entries, the {{EX:userPassword}} attribute is writable by the entry itself and by the "admin" entry. It may be used for authentication/authorization purposes, but is otherwise not readable. All other attributes are writable by the entry and the "admin" entry, but may be read by all users (authenticated or not). Line 42 is a blank line, indicating the end of this entry. The next section of the example configuration file defines another BDB database. This one handles queries involving the {{EX:dc=example,dc=net}} subtree but is managed by the same entity as the first database. Note that without line 51, the read access would be allowed due to the global access rule at line 19. E: 42. # BDB definition for example.net E: 43. dn: olcDatabase=bdb,cn=config E: 44. objectClass: olcDatabaseConfig E: 45. objectClass: olcBdbConfig E: 46. olcDatabase: bdb E: 47. olcSuffix: "dc=example,dc=net" E: 48. olcDbDirectory: /usr/local/var/openldap-data-net E: 49. olcRootDN: "cn=Manager,dc=example,dc=com" E: 50. olcDbIndex: objectClass eq E: 51. olcAccess: to * by users read