Spring LDAP auto-configuration

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LDAP (Lightweight Directory Access Protocol) is an open, vendor-neutral, industry standard
application protocol for accessing and maintaining distributed directory information services over
an IP network. Spring Boot offers auto-configuration for any compliant LDAP server as well as
support for the embedded in-memory LDAP server from UnboundID.

LDAP abstractions are provided by Spring Data LDAP. There is a spring-boot-starter-data-ldap
“Starter” for collecting the dependencies in a convenient way.

Connecting to an LDAP Server

To connect to an LDAP server, make sure you declare a dependency on the spring-boot-starterdata-
ldap “Starter” or spring-ldap-core and then declare the URLs of your server in your
application.properties, as shown in the following example:
spring.ldap.urls=ldap://myserver:1235
spring.ldap.username=admin
spring.ldap.password=secret

If you need to customize connection settings, you can use the spring.ldap.base and
spring.ldap.base-environment properties.
An LdapContextSource is auto-configured based on these settings. If a
DirContextAuthenticationStrategy bean is available, it is associated to the auto-configured
LdapContextSource. If you need to customize it, for instance to use a PooledContextSource, you can
still inject the auto-configured LdapContextSource. Make sure to flag your customized ContextSource
as @Primary so that the auto-configured LdapTemplate uses it.

Spring Data LDAP Repositories

Spring Data includes repository support for LDAP. For complete details of Spring Data LDAP, refer to
the reference documentation.
You can also inject an auto-configured LdapTemplate instance as you would with any other Spring
Bean, as shown in the following example:

@Component
public class MyBean {
private final LdapTemplate template;
@Autowired
public MyBean(LdapTemplate template) {
this.template = template;
}
// ...
}

Embedded In-memory LDAP Server

For testing purposes, Spring Boot supports auto-configuration of an in-memory LDAP server from
UnboundID. To configure the server, add a dependency to com.unboundid:unboundid-ldapsdk and

declare a configprop:spring.ldap.embedded.base-dn[] property, as follows:
spring.ldap.embedded.base-dn=dc=spring,dc=io

It is possible to define multiple base-dn values, however, since distinguished
names usually contain commas, they must be defined using the correct notation.
In yaml files, you can use the yaml list notation:
spring.ldap.embedded.base-dn:
- dc=spring,dc=io
- dc=pivotal,dc=io
In properties files, you must include the index as part of the property name:
spring.ldap.embedded.base-dn[0]=dc=spring,dc=io
spring.ldap.embedded.base-dn[1]=dc=pivotal,dc=io

By default, the server starts on a random port and triggers the regular LDAP support. There is no
need to specify a configprop:spring.ldap.urls[] property.
If there is a schema.ldif file on your classpath, it is used to initialize the server. If you want to load
the initialization script from a different resource, you can also use the
configprop:spring.ldap.embedded.ldif[] property.
By default, a standard schema is used to validate LDIF files. You can turn off validation altogether by
setting the configprop:spring.ldap.embedded.validation.enabled[] property. If you have custom
attributes, you can use configprop:spring.ldap.embedded.validation.schema[] to define your
custom attribute types or object classes.



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