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292 lines
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292 lines
11 KiB
Plaintext
[[nsa-ldap]]
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= LDAP Namespace Options
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LDAP is covered in some details in xref:servlet/authentication/passwords/ldap.adoc#servlet-authentication-ldap[its own chapter].
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We will expand on that here with some explanation of how the namespace options map to Spring beans.
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The LDAP implementation uses Spring LDAP extensively, so some familiarity with that project's API may be useful.
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[[nsa-ldap-server]]
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== Defining the LDAP Server using the
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`<ldap-server>` Element
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This element sets up a Spring LDAP `ContextSource` for use by the other LDAP beans, defining the location of the LDAP server and other information (such as a username and password, if it doesn't allow anonymous access) for connecting to it.
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It can also be used to create an embedded server for testing.
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Details of the syntax for both options are covered in the xref:servlet/authentication/passwords/ldap.adoc#servlet-authentication-ldap[LDAP chapter].
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The actual `ContextSource` implementation is `DefaultSpringSecurityContextSource` which extends Spring LDAP's `LdapContextSource` class.
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The `manager-dn` and `manager-password` attributes map to the latter's `userDn` and `password` properties respectively.
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If you only have one server defined in your application context, the other LDAP namespace-defined beans will use it automatically.
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Otherwise, you can give the element an "id" attribute and refer to it from other namespace beans using the `server-ref` attribute.
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This is actually the bean `id` of the `ContextSource` instance, if you want to use it in other traditional Spring beans.
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[[nsa-ldap-server-attributes]]
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=== <ldap-server> Attributes
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[[nsa-ldap-server-mode]]
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* **mode**
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Explicitly specifies which embedded ldap server should use. Values are `apacheds` and `unboundid`. By default, it will depends if the library is available in the classpath.
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[[nsa-ldap-server-id]]
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* **id**
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A bean identifier, used for referring to the bean elsewhere in the context.
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[[nsa-ldap-server-ldif]]
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* **ldif**
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Explicitly specifies an ldif file resource to load into an embedded LDAP server.
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The ldif should be a Spring resource pattern (i.e. classpath:init.ldif).
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The default is classpath*:*.ldif
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[[nsa-ldap-server-manager-dn]]
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* **manager-dn**
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Username (DN) of the "manager" user identity which will be used to authenticate to a (non-embedded) LDAP server.
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If omitted, anonymous access will be used.
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[[nsa-ldap-server-manager-password]]
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* **manager-password**
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The password for the manager DN.
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This is required if the manager-dn is specified.
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[[nsa-ldap-server-port]]
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* **port**
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Specifies an IP port number.
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Used to configure an embedded LDAP server, for example.
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The default value is 33389.
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[[nsa-ldap-server-root]]
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* **root**
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Optional root suffix for the embedded LDAP server.
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Default is "dc=springframework,dc=org"
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[[nsa-ldap-server-url]]
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* **url**
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Specifies the ldap server URL when not using the embedded LDAP server.
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[[nsa-ldap-authentication-provider]]
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== <ldap-authentication-provider>
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This element is shorthand for the creation of an `LdapAuthenticationProvider` instance.
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By default this will be configured with a `BindAuthenticator` instance and a `DefaultAuthoritiesPopulator`.
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As with all namespace authentication providers, it must be included as a child of the `authentication-provider` element.
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[[nsa-ldap-authentication-provider-parents]]
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=== Parent Elements of <ldap-authentication-provider>
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* xref:servlet/appendix/namespace/authentication-manager.adoc#nsa-authentication-manager[authentication-manager]
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[[nsa-ldap-authentication-provider-attributes]]
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=== <ldap-authentication-provider> Attributes
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[[nsa-ldap-authentication-provider-group-role-attribute]]
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* **group-role-attribute**
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The LDAP attribute name which contains the role name which will be used within Spring Security.
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Maps to the ``DefaultLdapAuthoritiesPopulator``'s `groupRoleAttribute` property.
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Defaults to "cn".
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[[nsa-ldap-authentication-provider-group-search-base]]
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* **group-search-base**
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Search base for group membership searches.
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Maps to the ``DefaultLdapAuthoritiesPopulator``'s `groupSearchBase` constructor argument.
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Defaults to "" (searching from the root).
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[[nsa-ldap-authentication-provider-group-search-filter]]
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* **group-search-filter**
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Group search filter.
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Maps to the ``DefaultLdapAuthoritiesPopulator``'s `groupSearchFilter` property.
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Defaults to `+(uniqueMember={0})+`.
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The substituted parameter is the DN of the user.
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[[nsa-ldap-authentication-provider-role-prefix]]
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* **role-prefix**
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A non-empty string prefix that will be added to role strings loaded from persistent.
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Maps to the ``DefaultLdapAuthoritiesPopulator``'s `rolePrefix` property.
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Defaults to "ROLE_".
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Use the value "none" for no prefix in cases where the default is non-empty.
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[[nsa-ldap-authentication-provider-server-ref]]
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* **server-ref**
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The optional server to use.
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If omitted, and a default LDAP server is registered (using <ldap-server> with no Id), that server will be used.
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[[nsa-ldap-authentication-provider-user-context-mapper-ref]]
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* **user-context-mapper-ref**
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Allows explicit customization of the loaded user object by specifying a UserDetailsContextMapper bean which will be called with the context information from the user's directory entry
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[[nsa-ldap-authentication-provider-user-details-class]]
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* **user-details-class**
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Allows the objectClass of the user entry to be specified.
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If set, the framework will attempt to load standard attributes for the defined class into the returned UserDetails object
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[[nsa-ldap-authentication-provider-user-dn-pattern]]
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* **user-dn-pattern**
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If your users are at a fixed location in the directory (i.e. you can work out the DN directly from the username without doing a directory search), you can use this attribute to map directly to the DN.
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It maps directly to the `userDnPatterns` property of `AbstractLdapAuthenticator`.
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The value is a specific pattern used to build the user's DN, for example `+uid={0},ou=people+`.
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The key `+{0}+` must be present and will be substituted with the username.
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[[nsa-ldap-authentication-provider-user-search-base]]
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* **user-search-base**
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Search base for user searches.
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Defaults to "".
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Only used with a 'user-search-filter'.
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+
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If you need to perform a search to locate the user in the directory, then you can set these attributes to control the search.
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The `BindAuthenticator` will be configured with a `FilterBasedLdapUserSearch` and the attribute values map directly to the first two arguments of that bean's constructor.
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If these attributes aren't set and no `user-dn-pattern` has been supplied as an alternative, then the default search values of `+user-search-filter="(uid={0})"+` and `user-search-base=""` will be used.
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[[nsa-ldap-authentication-provider-user-search-filter]]
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* **user-search-filter**
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The LDAP filter used to search for users (optional).
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For example `+(uid={0})+`.
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The substituted parameter is the user's login name.
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+
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If you need to perform a search to locate the user in the directory, then you can set these attributes to control the search.
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The `BindAuthenticator` will be configured with a `FilterBasedLdapUserSearch` and the attribute values map directly to the first two arguments of that bean's constructor.
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If these attributes aren't set and no `user-dn-pattern` has been supplied as an alternative, then the default search values of `+user-search-filter="(uid={0})"+` and `user-search-base=""` will be used.
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[[nsa-ldap-authentication-provider-children]]
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=== Child Elements of <ldap-authentication-provider>
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* <<nsa-password-compare,password-compare>>
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[[nsa-password-compare]]
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== <password-compare>
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This is used as child element to `<ldap-provider>` and switches the authentication strategy from `BindAuthenticator` to `PasswordComparisonAuthenticator`.
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[[nsa-password-compare-parents]]
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=== Parent Elements of <password-compare>
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* <<nsa-ldap-authentication-provider,ldap-authentication-provider>>
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[[nsa-password-compare-attributes]]
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=== <password-compare> Attributes
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[[nsa-password-compare-hash]]
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* **hash**
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Defines the hashing algorithm used on user passwords.
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We recommend strongly against using MD4, as it is a very weak hashing algorithm.
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[[nsa-password-compare-password-attribute]]
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* **password-attribute**
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The attribute in the directory which contains the user password.
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Defaults to "userPassword".
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[[nsa-password-compare-children]]
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=== Child Elements of <password-compare>
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* xref:servlet/appendix/namespace/authentication-manager.adoc#nsa-password-encoder[password-encoder]
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[[nsa-ldap-user-service]]
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== <ldap-user-service>
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This element configures an LDAP `UserDetailsService`.
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The class used is `LdapUserDetailsService` which is a combination of a `FilterBasedLdapUserSearch` and a `DefaultLdapAuthoritiesPopulator`.
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The attributes it supports have the same usage as in `<ldap-provider>`.
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[[nsa-ldap-user-service-attributes]]
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=== <ldap-user-service> Attributes
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[[nsa-ldap-user-service-cache-ref]]
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* **cache-ref**
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Defines a reference to a cache for use with a UserDetailsService.
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[[nsa-ldap-user-service-group-role-attribute]]
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* **group-role-attribute**
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The LDAP attribute name which contains the role name which will be used within Spring Security.
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Defaults to "cn".
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[[nsa-ldap-user-service-group-search-base]]
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* **group-search-base**
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Search base for group membership searches.
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Defaults to "" (searching from the root).
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[[nsa-ldap-user-service-group-search-filter]]
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* **group-search-filter**
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Group search filter.
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Defaults to `+(uniqueMember={0})+`.
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The substituted parameter is the DN of the user.
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[[nsa-ldap-user-service-id]]
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* **id**
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A bean identifier, used for referring to the bean elsewhere in the context.
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[[nsa-ldap-user-service-role-prefix]]
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* **role-prefix**
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A non-empty string prefix that will be added to role strings loaded from persistent storage (e.g.
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"ROLE_").
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Use the value "none" for no prefix in cases where the default is non-empty.
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[[nsa-ldap-user-service-server-ref]]
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* **server-ref**
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The optional server to use.
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If omitted, and a default LDAP server is registered (using <ldap-server> with no Id), that server will be used.
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[[nsa-ldap-user-service-user-context-mapper-ref]]
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* **user-context-mapper-ref**
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Allows explicit customization of the loaded user object by specifying a UserDetailsContextMapper bean which will be called with the context information from the user's directory entry
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[[nsa-ldap-user-service-user-details-class]]
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* **user-details-class**
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Allows the objectClass of the user entry to be specified.
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If set, the framework will attempt to load standard attributes for the defined class into the returned UserDetails object
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[[nsa-ldap-user-service-user-search-base]]
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* **user-search-base**
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Search base for user searches.
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Defaults to "".
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Only used with a 'user-search-filter'.
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[[nsa-ldap-user-service-user-search-filter]]
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* **user-search-filter**
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The LDAP filter used to search for users (optional).
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For example `+(uid={0})+`.
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The substituted parameter is the user's login name.
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