Lightweight Third-Party Authentication (LTPA) is a type
of authentication mechanism in WebSphere® Application
Server security that defines a particular token format. The purpose
of the LTPA token authentication is to flow the LTPA token from the
first web service, which authenticated the originating client, to
the downstream web service. You can configure the server to validate
LTPA token authentication.
About this task
Important: There is an important distinction
between Version 5.x and Version 6.0.x and later applications.
The information supports Version 5.x applications only that
are used with WebSphere Application Server Version 6.0.x and
later. The information does not apply to Version 6.0.x and
later applications.
This task is used to
configure LTPA. Do not attempt to configure LTPA from a pure client.
After the downstream web service receives the LTPA token, it validates
the token to verify that the token has not been modified and has not
expired. For validation to be successful, the LTPA keys used by both
the sending and receiving servers must be the same.
Complete
the following steps to specify how the server must validate the LTPA
token authentication information:
Procedure
- Launch an assembly tool.
For more information,
see the related information on Assembly Tools.
- Switch to the Java™ 2
Platform, Enterprise Edition (J2EE) perspective. Click .
- Click .
- Right-click the webservices.xml file,
and click .
-
Click the Binding Configurations tab, which is located at the end of the web services editor
within the assembly tool.
- Expand the section.
- Click Edit to view the login mapping
information.
The login mapping information is displayed.
Select or enter the following information:
- Authentication method
- Specifies the type of authentication that occurs. Select LTPA to
use LTPA token authentication.
- Configuration name
- Specifies the Java Authentication and Authorization
Service (JAAS) login configuration name. For the LTPA authentication
method, enter WSLogin for the JAAS login configuration
name. This configuration understands how to validate an LTPA token.
- Use token value type
- Determines if you want to specify a custom token type. For LTPA
authentication, you must select this option because LTPA is considered
a custom type. LTPA is not in the Web Services Security Specification.
- Token value type URI and local name
- Specifies custom authentication types. If you select Use
Token value type you must enter data into the Token value
Type URI (Uniform Resource Identifier) and local name fields. For
the token value type URI field, enter the following string:
https://www.ibm.com/websphere/appserver/tokentype/5.0.2
.
For the local name, enter the following string: LTPA
- Callback handler factory class name
- Creates a JAAS CallbackHandler implementation that understands
the following callback handlers:
- javax.security.auth.callback.NameCallback
- javax.security.auth.callback.PasswordCallback
- com.ibm.wsspi.wssecurity.auth.callback.BinaryTokenCallback
- com.ibm.wsspi.wssecurity.auth.callback.XMLTokenReceiverCallback
- com.ibm.wsspi.wssecurity.auth.callback.PropertyCallback
For any of the default authentication methods (BasicAuth, IDAssertion,
Signature, and LTPA), use the callback handler factory default implementation.
Enter the following class name for any of the default authentication
methods including LTPA: com.ibm.wsspi.wssecurity.auth.callback.WSCallbackHandlerFactoryImpl
This
implementation creates the correct callback handler for the default
implementations.
- Callback handler factory property
- Specifies callback handler properties for custom callback handler
factory implementations. Default callback handler factory implementation
does not any property specifications. For LTPA, leave this field blank.
- Login mapping property
- Specifies properties for a custom login mapping. For default implementations
including LTPA, leave this field blank.
What to do next
See the task for configuring the server to handle LTPA token
authentication information if you have not previously specified this
information.