When configuring the service for handling UsernameToken and signatures, it's setup like this:
<service name="serviceName">
<inbound>
<cxf:inbound-endpoint address="someUrl" protocolConnector="httpsConnector" >
<cxf:inInterceptors>
<spring:bean class="org.apache.cxf.binding.soap.saaj.SAAJInInterceptor" />
<spring:bean class="org.apache.cxf.ws.security.wss4j.WSS4JInInterceptor">
<spring:constructor-arg>
<spring:map>
<spring:entry key="action" value="UsernameToken Timestamp Signature" />
<spring:entry key="passwordCallbackRef" value-ref="serverCallback" />
<spring:entry key="signaturePropFile" value="wssecurity.properties" />
</spring:map>
</spring:constructor-arg>
</spring:bean>
</cxf:inInterceptors>
</cxf:inbound-endpoint>
</inbound>
</service>
But how is it possible to create a policy of what algorithms that are allowed, and what parts of the message that should be signed?