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CXF WS-RM Inbound Protocol

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Last updated: Dec 12, 2019
7 min read

WS­ReliableMessaging allows SOAP messages to be reliably delivered between distributed applications, regardless of software or hardware failures. The CXF WS­-RM inbound endpoint allows a client (RM Source) to communicate with the ESB profile of WSO2 EI (RM Destination) with a guarantee that a message sent will be delivered.

Note

To configure the CXF WS-RM Inbound endpoint, you need to install the CXF WS Reliable Messaging feature. For information on how to install this feature, see Installing Features.

  <features>
    <feature>
        <id>org.wso2.carbon.inbound.endpoints.ext.wsrm.feature.group</id>
        <version>4.6.6</version>
    </feature>
  </features>

After you install this feature, you can configure the CXF WS-RM inbound endpoint as a custom inbound endpoint.

Following is a sample sequence that sends messages that are from a RM source to a non RM backend:

<sequence xmlns="http://ws.apache.org/ns/synapse" name="RMIn" onError="fault">
   <in>
      <property name="PRESERVE_WS_ADDRESSING" value="true"/>
      <header xmlns:wsrm="http://schemas.xmlsoap.org/ws/2005/02/rm" name="wsrm:Sequence" action="remove"/>
      <header xmlns:wsa="http://www.w3.org/2005/08/addressing" name="wsa:To" action="remove"/>
      <header xmlns:wsa="http://www.w3.org/2005/08/addressing" name="wsa:FaultTo" action="remove"/>
      <send>
         <endpoint>
            <address uri="http://localhost:9000/services/SimpleStockQuoteService"/>
         </endpoint>
      </send>
   </in>
   <out>
      <log level="custom">
         <property name="RM OutSequence" value="Sending Response"/>
      </log>
      <send/>
   </out>
</sequence>

Since the WS-ReliableMessaging protocol uses specific SOAP headers, those SOAP headers should be removed from the sequence since in most cases the backend service would fail to understand them.

The CXF bus should be configured as required in order to control the manner in which WS-RM communication takes place. This can be done through a CXF spring configuration. Create a directory named cxf within <EI_HOME>/conf  and save the CXF spring configuration file in the <EI_HOME>/conf/ cxf directory.

<beans
    xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:wsa="http://cxf.apache.org/ws/addressing"
    xmlns:http="http://cxf.apache.org/transports/http/configuration"
    xmlns:wsrm-policy="http://schemas.xmlsoap.org/ws/2005/02/rm/policy"
    xmlns:wsrm-mgr="http://cxf.apache.org/ws/rm/manager" 
    xsi:schemaLocation="http://cxf.apache.org/core 
    http://cxf.apache.org/schemas/core.xsd        
    http://cxf.apache.org/transports/http/configuration 
    http://cxf.apache.org/schemas/configuration/http-conf.xsd        
    http://schemas.xmlsoap.org/ws/2005/02/rm/policy 
    http://schemas.xmlsoap.org/ws/2005/02/rm/wsrm-policy.xsd        
    http://cxf.apache.org/ws/rm/manager 
    http://cxf.apache.org/schemas/configuration/wsrm-manager.xsd        
    http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd"
    xmlns:cxf="http://cxf.apache.org/core">
    <cxf:bus>
        <cxf:features>
            <wsa:addressing/>
            <wsrm-mgr:reliableMessaging>
                <wsrm-policy:RMAssertion>
                    <wsrm-policy:BaseRetransmissionInterval Milliseconds="4000"/>
                    <wsrm-policy:AcknowledgementInterval Milliseconds="2000"/>
                </wsrm-policy:RMAssertion>
                <wsrm-mgr:destinationPolicy>
                    <wsrm-mgr:acksPolicy intraMessageThreshold="0"/>
                </wsrm-mgr:destinationPolicy>
            </wsrm-mgr:reliableMessaging>
        </cxf:features>
    </cxf:bus>
</beans>

 

If you need to secure the endpoint, you should change the CXF spring configuration as follows: 
<beans
    xmlns="http://www.springframework.org/schema/beans"
    xmlns:sec="http://cxf.apache.org/configuration/security"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:cxf="http://cxf.apache.org/core"
    xmlns:wsa="http://cxf.apache.org/ws/addressing"
    xmlns:httpj="http://cxf.apache.org/transports/http-jetty/configuration"
    xmlns:http="http://cxf.apache.org/transports/http/configuration"
    xmlns:wsrm-policy="http://schemas.xmlsoap.org/ws/2005/02/rm/policy"
    xmlns:wsrm-mgr="http://cxf.apache.org/ws/rm/manager" 
    xsi:schemaLocation="http://cxf.apache.org/core http://cxf.apache.org/schemas/core.xsd        
    http://cxf.apache.org/transports/http/configuration 
    http://cxf.apache.org/schemas/configuration/http-conf.xsd        
    http://schemas.xmlsoap.org/ws/2005/02/rm/policy 
    http://schemas.xmlsoap.org/ws/2005/02/rm/wsrm-policy.xsd 
    http://cxf.apache.org/configuration/security 
    http://cxf.apache.org/schemas/configuration/security.xsd        
    http://cxf.apache.org/ws/rm/manager http://cxf.apache.org/schemas/configuration/wsrm-manager.xsd        
    http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd 
    http://cxf.apache.org/transports/http-jetty/configuration             
    http://cxf.apache.org/schemas/configuration/http-jetty.xsd">
    <cxf:bus>
        <cxf:features>
            <wsa:addressing/>
            <wsrm-mgr:reliableMessaging>
                <wsrm-policy:RMAssertion>
                    <wsrm-policy:BaseRetransmissionInterval Milliseconds="4000"/>
                    <wsrm-policy:AcknowledgementInterval Milliseconds="2000"/>
                </wsrm-policy:RMAssertion>
                <wsrm-mgr:destinationPolicy>
                    <wsrm-mgr:acksPolicy intraMessageThreshold="0"/>
                </wsrm-mgr:destinationPolicy>
            </wsrm-mgr:reliableMessaging>
        </cxf:features>
    </cxf:bus>
    <http:destination name="{http://apache.org/hello_world_soap_http}GreeterPort.http-destination"></http:destination>
    <httpj:engine-factory>
        <httpj:engine port="8081">
            <httpj:tlsServerParameters>
                <sec:keyManagers keyPassword="wso2carbon">
                    <sec:keyStore file="/path/to/file/wso2carbon.jks" password="wso2carbon" type="JKS"/>
                </sec:keyManagers>
                <sec:trustManagers>
                    <sec:keyStore file="/path/to/file/client-truststore.jks" password="wso2carbon" type="JKS"/>
                </sec:trustManagers>
                <sec:cipherSuitesFilter>
                    <!-- these filters ensure that a ciphersuite with
                    export-suitable or null encryption is used,
                    but exclude anonymous Diffie-Hellman key change as
                    this is vulnerable to man-in-the-middle attacks -->
                    <sec:include>.*_EXPORT_.*</sec:include>
                    <sec:include>.*_EXPORT1024_.*</sec:include>
                    <sec:include>.*_WITH_DES_.*</sec:include>
                    <sec:include>.*_WITH_AES_.*</sec:include>
                    <sec:include>.*_WITH_NULL_.*</sec:include>
                    <sec:exclude>.*_DH_anon_.*</sec:exclude>
                </sec:cipherSuitesFilter>
                <sec:clientAuthentication want="true" required="true"/>
            </httpj:tlsServerParameters>
        </httpj:engine>
    </httpj:engine-factory>
</beans>

Sample CXF WS-RM Inbound

<inboundEndpoint xmlns="http://ws.apache.org/ns/synapse"
                 name="RM_INBOUND"
                 sequence="RMIn"
                 onError="fault"
                 class="org.wso2.carbon.inbound.endpoint.ext.wsrm.InboundRMHttpListener"
                 suspend="false">
   <parameters>
      <parameter name="inbound.cxf.rm.port">20940</parameter>
      <parameter name="inbound.cxf.rm.config-file">conf/cxf/server.xml</parameter>
      <parameter name="coordination">true</parameter>
      <parameter name="inbound.cxf.rm.host">127.0.0.1</parameter>
      <parameter name="inbound.behavior">listening</parameter>
      <parameter name="sequential">true</parameter>
   </parameters>
</inboundEndpoint>


The CXF WS-RM Inbound endpoint can be configured by specifying the following parameters:

  • Sequence - The sequence that the message will be injected to.

  • Error sequence - The sequence to be called if a fault occurs.

  • Suspend - If the inbound listener should pause when accepting incoming requests, set this to true. If the inbound listener should not pause when accepting incoming requests, set this to false.

  • inbound.cxf.rm.host - The host name.

  • inbound.cxf.rm.port - The port to listen to.

    Note

    When configuring a SSL enabled cxf_ws_rm inbound endpoint, the inbound.cxf.rm.port parameter should be set to the same value as the engine port number specified in the CXF spring configuration file saved in the <EI_HOME>/conf/cxf directory.

    For example, in the above CXF spring configuration, the engine port is 8081. This same port number should be specified as the inbound.cxf.rm.port in the cxf_ws_rm inbound endpoint configuration.

  • inbound.cxf.rm.config-file - The path to the CXF Spring configuration file.

  • enableSSL - Set to true if SSL is enabled in the CXF Spring configuration file.

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