[[WS-Policy]]
= WS-Policy

[[apache-cxf-ws-policy-support]]
== Apache CXF WS-Policy support

JBossWS policy support rely on the Apache CXF WS-Policy framework, which
is compliant with the
http://www.w3.org/TR/2007/REC-ws-policy-20070904/[Web Services Policy
1.5 - Framework] and
http://www.w3.org/TR/2007/REC-ws-policy-attach-20070904/[Web Services
Policy 1.5 - Attachment] specifications. +
Users can work with policies in different ways:

* by adding policy assertions to wsdl contracts and letting the runtime
consume them and behave accordingly;
* by specifying endpoint policy attachments using either CXF annotations
or features.

Of course users can also make direct use of the Apache CXF policy
framework,
http://cxf.apache.org/docs/developing-assertions.html[defining custom
assertions], etc.

Finally, JBossWS provides some additional annotations for simplified
policy attachment.

[[contract-first-approach]]
=== Contract-first approach

WS-Policies can be attached and referenced in wsdl elements (the
specifications describe all possible alternatives). Apache CXF
automatically recognizes, reads and uses policies defined in the wsdl.

Users should hence develop endpoints using the _contract-first_
approach, that is explicitly providing the contract for their services.
Here is a excerpt taken from a wsdl including a WS-Addressing policy:

[source,xml,options="nowrap"]
----
<wsdl:definitions name="Foo" targetNamespace="http://ws.jboss.org/foo"
...
<wsdl:service name="FooService">
    <wsdl:port binding="tns:FooBinding" name="FooPort">
        <soap:address location="http://localhost:80800/foo"/>
        <wsp:Policy xmlns:wsp="http://www.w3.org/ns/ws-policy">
             <wsam:Addressing xmlns:wsam="http://www.w3.org/2007/02/addressing/metadata">
                 <wsp:Policy/>
              </wsam:Addressing>
         </wsp:Policy>
    </wsdl:port>
</wsdl:service>
</wsdl:definitions>
----

Of course, CXF also acts upon policies specified in wsdl documents
consumed on client side.

[[code-first-approach]]
=== Code-first approach

For those preferring code-first (java-first) endpoint development,
Apache CXF comes with `org.apache.cxf.annotations.Policy` and
`org.apache.cxf.annotations.Policies` annotations to be used for
attaching policy fragments to the wsdl generated at deploy time.

Here is an example of a code-first endpoint including @Policy
annotation:

[source,java,options="nowrap"]
----
import javax.jws.WebService;
import org.apache.cxf.annotations.Policy;
 
@WebService(portName = "MyServicePort",
            serviceName = "MyService",
            name = "MyServiceIface",
            targetNamespace = "http://www.jboss.org/jbossws/foo")
@Policy(placement = Policy.Placement.BINDING, uri = "JavaFirstPolicy.xml")
public class MyServiceImpl {
   public String sayHello() {
      return "Hello World!";
   }
}
----

The referenced descriptor is to be added to the deployment and will
include the policy to be attached; the attachment position in the
contracts is defined through the `placement` attribute. Here is a
descriptor example:

[source,xml,options="nowrap"]
----
<?xml version="1.0" encoding="UTF-8" ?>
<wsp:Policy wsu:Id="MyPolicy" xmlns:wsp="http://www.w3.org/ns/ws-policy"
    xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
    <wsp:ExactlyOne>
        <wsp:All>
            <sp:SupportingTokens xmlns:sp="http://schemas.xmlsoap.org/ws/2005/07/securitypolicy">
                <wsp:Policy>
                    <sp:UsernameToken sp:IncludeToken="http://schemas.xmlsoap.org/ws/2005/07/securitypolicy/IncludeToken/AlwaysToRecipient">
                        <wsp:Policy>
                            <sp:WssUsernameToken10/>
                        </wsp:Policy>
                    </sp:UsernameToken>
                </wsp:Policy>
            </sp:SupportingTokens>
        </wsp:All>
    </wsp:ExactlyOne>
</wsp:Policy>
----

[[jbossws-additions]]
== JBossWS additions

[[policy-sets]]
=== Policy sets

Both approaches above require users to actually write their policies'
assertions; while this offer great flexibility and control of the actual
contract, providing the assertions might end up being quite a
challenging task for complex policies. For this reason, the JBossWS
integration provides _policy sets_, which are basically pre-defined
groups of policy assertions corresponding to well known / common needs.
Each set has a label allowing users to specify it in the
`@org.jboss.ws.api.annotation.PolicySets` annotation to have the policy
assertions for that set attached to the annotated endpoint. Multiple
labels can also be specified. Here is an example of the @PolicySets
annotation on a service endpoint interface:

[source,java,options="nowrap"]
----
import javax.jws.WebService;
import org.jboss.ws.api.annotation.PolicySets;
 
@WebService(name = "EndpointTwo", targetNamespace = "http://org.jboss.ws.jaxws.cxf/jbws3648")
@PolicySets({"WS-RM_Policy_spec_example", "WS-SP-EX223_WSS11_Anonymous_X509_Sign_Encrypt", "WS-Addressing"})
public interface EndpointTwo
{
   String echo(String input);
}
----

The three sets specified in @PolicySets will cause the wsdl generated
for the endpoint having this interface to be enriched with some policy
assertions for WS-RM, WS-Security and WS-Addressing.

The labels' list of known sets is stored in the
`META-INF/policies/org.jboss.wsf.stack.cxf.extensions.policy.PolicyAttachmentStore`
file within the `jbossws-cxf-client.jar` (
`org.jboss.ws.cxf:jbossws-cxf-client` maven artifact). Actual policy
fragments for each set are also stored in the same artifact at
`META-INF/policies/<set-label>-<attachment-position>.xml`.

Here is a list of the available policy sets:

[cols=",",options="header"]
|=======================================================================
|Label |Description

|WS-Addressing |Basic WS-Addressing policy

|WS-RM_Policy_spec_example |The basic WS-RM policy example in the WS-RM
specification

|WS-SP-EX2121_SSL_UT_Supporting_Token |The group of policy assertions
used in the section 2.1.2.1 example of the WS-Security Policy Examples
1.0 specification

|WS-SP-EX213_WSS10_UT_Mutual_Auth_X509_Sign_Encrypt |The group of policy
assertions used in the section 2.1.3 example of the WS-Security Policy
Examples 1.0 specification

|WS-SP-EX214_WSS11_User_Name_Cert_Sign_Encrypt |The group of policy
assertions used in the section 2.1.4 example of the WS-Security Policy
Examples 1.0 specification

|WS-SP-EX221_WSS10_Mutual_Auth_X509_Sign_Encrypt |The group of policy
assertions used in the section 2.2.1 example of the WS-Security Policy
Examples 1.0 specification

|WS-SP-EX222_WSS10_Mutual_Auth_X509_Sign_Encrypt |The group of policy
assertions used in the section 2.2.2 example of the WS-Security Policy
Examples 1.0 specification

|WS-SP-EX223_WSS11_Anonymous_X509_Sign_Encrypt |The group of policy
assertions used in the section 2.2.3 example of the WS-Security Policy
Examples 1.0 specification

|WS-SP-EX224_WSS11_Mutual_Auth_X509_Sign_Encrypt |The group of policy
assertions used in the section 2.2.4 example of the WS-Security Policy
Examples 1.0 specification

|AsymmetricBinding_X509v1_TripleDesRsa15_EncryptBeforeSigning_ProtectTokens
|A WS-Security policy for asymmetric binding (encrypt before signing)
using X.509v1 tokens, 3DES + RSA 1.5 algorithms and with token
protections enabled

|AsymmetricBinding_X509v1_GCM256OAEP_ProtectTokens |The same as before,
but using custom Apache CXF algorithm suite including GCM 256 + RSA OAEP
algorithms
|=======================================================================

[WARNING]

Always verify the contents of the generated wsdl contract, as policy
sets are potentially subject to updates between JBossWS releases. This
is especially important when dealing with security related policies; the
provided sets are to be considered as convenient configuration options
only; users remain responsible for the policies in their contracts.

[TIP]

The `org.jboss.wsf.stack.cxf.extensions.policy.Constants` interface has
convenient String constants for the available policy set labels.

[TIP]

If you feel a new set should be added, just propose it by writing the
user forum!
