Signature authentication method
Signature authentication refers to an X.509 certificate that is sent by the client to the server. The certificate is used to authenticate to the user registry that is configured at the server. When using the signature authentication method, the security token is generated with a ds:Signature and a wsse:BinarySecurityToken element.
- Signature token generation
- The request sender generates a Signature security token using
a callback handler. The security token returned by the callback handler
is inserted in the SOAP message. The callback handler is specified
in the <LoginBinding> element of the bindings file, ibm-webservicesclient-bnd.xmi. WebSphere Application Server provides the
following callback handler implementation that can be used with the
Signature authentication method: com.ibm.wsspi.wssecurity.auth.callback.NonPromptCallbackHandler
You can add your own callback handlers that implement the javax.security.auth.callback.CallbackHandler implementation.
- Security token validation
- The request receiver retrieves the Signature security token from
the SOAP message and validates it using a JAAS login module. The <ds:Signature>
and <wsse:BinarySecurityToken> elements in the security token
are used to perform the validation. If the validation is successful,
the login module returns a Java Authentication
and Authorization Service (JAAS) Subject. This Subject then is set
as the identity of the running thread. If the validation fails, the
request is rejected with a SOAP fault exception.
The JAAS login configuration is specified in the
<LoginMapping>
element of the bindings file. Default bindings are specified in the ws-security.xml file. However, you can override these bindings using the application-specific ibm-webservices-bnd.xmi file. The configuration information consists of a CallbackHandlerFactory and a ConfigName. The CallbackHandlerFactory specifies the name of a class that is used for creating the JAAS CallbackHandler object. WebSphere Application Server provides the com.ibm.wsspi.wssecurity.auth.callback.WSCallbackHandlerFactoryImp CallbackHandlerFactory implementation. The ConfigName specifies a JAAS configuration name entry. WebSphere Application Server searches in the security.xml file for a matching configuration name entry. If a match is not found, it searches the wsjaas.conf file. WebSphere Application Server provides the system.wssecurity.Signature default configuration entry, which is suitable for the signature authentication method.