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A.8.4. 场景：ActAs WS-Trust

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ActA 功能用于需要复合委派的情况。它通常用于多层系统中，其中的应用代表登录用户调用服务，或者服务代表原始调用者调用其他服务。

actionas 不仅仅是 RequestSecurityToken (RST)中的新子元素。它在与 STS 协商令牌时提供有关原始调用者的额外信息。ActAs 元素通常采用令牌的形式，其身份声明（如名称、角色和授权代码）供客户端访问服务。

ActA 场景是基本 WS-Trust 场景的扩展。在本例中，ActAs 服务代表用户调用 ws-service。对基本场景的代码仅作几处补充。添加了 ActAs Web 服务提供商和回调处理程序。ActAs Web 服务的 WSDL 采用了与 ws-provider 相同的安全策略。UsernameTokenCallbackHandler 是一个新实用程序，可为 ActAs 元素生成内容。最后，STS 中添加了一些代码来支持 ActAs 请求。

A.8.4.1. Web 服务提供商

本节详细介绍了已更改的基本 WS-Trust 场景中的 Web 服务元素，以满足 ActAs 示例 的需求。这些组件包括：

A.8.4.1.1. Web 服务提供商 WSDL

ActAs Web 服务提供商的 WSDL 是 ws-provider 的 WSDL 的 克隆。wsp:Policy 部分是相同的。服务端点、target Namespace、port Type、绑定 名称和 服务 都有更改。 

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<definitions targetNamespace="http://www.jboss.org/jbossws/ws-extensions/actaswssecuritypolicy" name="ActAsService"
             xmlns:tns="http://www.jboss.org/jbossws/ws-extensions/actaswssecuritypolicy"
             xmlns:xsd="http://www.w3.org/2001/XMLSchema"
             xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
             xmlns="http://schemas.xmlsoap.org/wsdl/"
             xmlns:wsp="http://www.w3.org/ns/ws-policy"
             xmlns:wsam="http://www.w3.org/2007/05/addressing/metadata"
             xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"
             xmlns:wsaws="http://www.w3.org/2005/08/addressing"
             xmlns:sp="http://docs.oasis-open.org/ws-sx/ws-securitypolicy/200702"
             xmlns:t="http://docs.oasis-open.org/ws-sx/ws-trust/200512">
    <types>
        <xsd:schema>
            <xsd:import namespace="http://www.jboss.org/jbossws/ws-extensions/actaswssecuritypolicy"
                    schemaLocation="ActAsService_schema1.xsd"/>
        </xsd:schema>
    </types>
    <message name="sayHello">
        <part name="parameters" element="tns:sayHello"/>
    </message>
    <message name="sayHelloResponse">
        <part name="parameters" element="tns:sayHelloResponse"/>
    </message>
    <portType name="ActAsServiceIface">
        <operation name="sayHello">
            <input message="tns:sayHello"/>
            <output message="tns:sayHelloResponse"/>
        </operation>
    </portType>
    <binding name="ActAsServicePortBinding" type="tns:ActAsServiceIface">
        <wsp:PolicyReference URI="#AsymmetricSAML2Policy" />
        <soap:binding transport="http://schemas.xmlsoap.org/soap/http" style="document"/>
        <operation name="sayHello">
            <soap:operation soapAction=""/>
            <input>
                <soap:body use="literal"/>
                <wsp:PolicyReference URI="#Input_Policy" />
            </input>
            <output>
                <soap:body use="literal"/>
                <wsp:PolicyReference URI="#Output_Policy" />
            </output>
        </operation>
    </binding>
    <service name="ActAsService">
        <port name="ActAsServicePort" binding="tns:ActAsServicePortBinding">
            <soap:address location="http://@jboss.bind.address@:8080/jaxws-samples-wsse-policy-trust-actas/ActAsService"/>
        </port>
    </service>

</definitions>
A.8.4.1.2. Web 服务提供商接口

ActAsServiceIface Web 服务提供商界面类是一个简单的 Web 服务定义。 

package org.jboss.test.ws.jaxws.samples.wsse.policy.trust.actas;

import javax.jws.WebMethod;
import javax.jws.WebService;

@WebService
(
   targetNamespace = "http://www.jboss.org/jbossws/ws-extensions/actaswssecuritypolicy"
)
public interface ActAsServiceIface {
   @WebMethod
   String sayHello();
}
A.8.4.1.3. Web 服务提供商实施

ActAsServiceImpl Web 服务提供商实施类是一个简单的 POJO。它使用标准的 WebService 注释来定义服务端点和两个 Apache WSS4J 注释（Ed pointProperties 和 EndpointProperty ），用于为 Apache CXF 运行时配置端点。提供的 WSS4J 配置信息用于 WSS4J 的 Crypto Merlin 实施。

ActAsServiceImpl 代表用户调用 ServiceImpl。setupService 方法执行所需的配置设置。 

package org.jboss.test.ws.jaxws.samples.wsse.policy.trust.actas;

import org.apache.cxf.Bus;
import org.apache.cxf.BusFactory;
import org.apache.cxf.annotations.EndpointProperties;
import org.apache.cxf.annotations.EndpointProperty;
import org.apache.cxf.ws.security.SecurityConstants;
import org.apache.cxf.ws.security.trust.STSClient;
import org.jboss.test.ws.jaxws.samples.wsse.policy.trust.service.ServiceIface;
import org.jboss.test.ws.jaxws.samples.wsse.policy.trust.shared.WSTrustAppUtils;

import javax.jws.WebService;
import javax.xml.namespace.QName;
import javax.xml.ws.BindingProvider;
import javax.xml.ws.Service;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Map;

@WebService
(
   portName = "ActAsServicePort",
   serviceName = "ActAsService",
   wsdlLocation = "WEB-INF/wsdl/ActAsService.wsdl",
   targetNamespace = "http://www.jboss.org/jbossws/ws-extensions/actaswssecuritypolicy",
   endpointInterface = "org.jboss.test.ws.jaxws.samples.wsse.policy.trust.actas.ActAsServiceIface"
)

@EndpointProperties(value = {
      @EndpointProperty(key = "ws-security.signature.username", value = "myactaskey"),
      @EndpointProperty(key = "ws-security.signature.properties", value =  "actasKeystore.properties"),
      @EndpointProperty(key = "ws-security.encryption.properties", value = "actasKeystore.properties"),
      @EndpointProperty(key = "ws-security.callback-handler", value = "org.jboss.test.ws.jaxws.samples.wsse.policy.trust.actas.ActAsCallbackHandler")
})

public class ActAsServiceImpl implements ActAsServiceIface {
   public String sayHello() {
      try {
         ServiceIface proxy = setupService();
         return "ActAs " + proxy.sayHello();
      } catch (MalformedURLException e) {
         e.printStackTrace();
      }
      return null;
   }

   private  ServiceIface setupService()throws MalformedURLException {
      ServiceIface proxy = null;
      Bus bus = BusFactory.newInstance().createBus();

      try {
         BusFactory.setThreadDefaultBus(bus);

         final String serviceURL = "http://" + WSTrustAppUtils.getServerHost() + ":8080/jaxws-samples-wsse-policy-trust/SecurityService";
         final QName serviceName = new QName("http://www.jboss.org/jbossws/ws-extensions/wssecuritypolicy", "SecurityService");
         final URL wsdlURL = new URL(serviceURL + "?wsdl");
         Service service = Service.create(wsdlURL, serviceName);
         proxy = (ServiceIface) service.getPort(ServiceIface.class);

         Map<String, Object> ctx = ((BindingProvider) proxy).getRequestContext();
         ctx.put(SecurityConstants.CALLBACK_HANDLER, new ActAsCallbackHandler());

         ctx.put(SecurityConstants.SIGNATURE_PROPERTIES,
            Thread.currentThread().getContextClassLoader().getResource("actasKeystore.properties" ));
         ctx.put(SecurityConstants.SIGNATURE_USERNAME, "myactaskey" );
         ctx.put(SecurityConstants.ENCRYPT_PROPERTIES,
            Thread.currentThread().getContextClassLoader().getResource("../../META-INF/clientKeystore.properties" ));
         ctx.put(SecurityConstants.ENCRYPT_USERNAME, "myservicekey");

         STSClient stsClient = new STSClient(bus);
         Map<String, Object> props = stsClient.getProperties();
         props.put(SecurityConstants.USERNAME, "alice");
         props.put(SecurityConstants.ENCRYPT_USERNAME, "mystskey");
         props.put(SecurityConstants.STS_TOKEN_USERNAME, "myactaskey" );
         props.put(SecurityConstants.STS_TOKEN_PROPERTIES,
            Thread.currentThread().getContextClassLoader().getResource("actasKeystore.properties" ));
         props.put(SecurityConstants.STS_TOKEN_USE_CERT_FOR_KEYINFO, "true");

         ctx.put(SecurityConstants.STS_CLIENT, stsClient);

      } finally {
         bus.shutdown(true);
      }

      return proxy;
   }

}
A.8.4.1.4. ActAsCallbackHandler Class

ActAsCallbackHandler 是 WSS4J Crypto API 的回调处理程序。它用于在密钥存储中获取私钥的密码。此类使 Apache CXF 能够检索用于消息签名的用户名密码。此类已更新，以返回此服务的密码，即 myactaskey 和 ActAs 用户 alice。 

package org.jboss.test.ws.jaxws.samples.wsse.policy.trust.actas;

import org.jboss.wsf.stack.cxf.extensions.security.PasswordCallbackHandler;
import java.util.HashMap;
import java.util.Map;

public class ActAsCallbackHandler extends PasswordCallbackHandler {

   public ActAsCallbackHandler() {
      super(getInitMap());
   }

   private static Map<String, String> getInitMap() {
      Map<String, String> passwords = new HashMap<String, String>();
      passwords.put("myactaskey", "aspass");
      passwords.put("alice", "clarinet");
      return passwords;
   }
}
A.8.4.1.5. UsernameTokenCallbackHandler

RequestSecurityToken 的 ActAs 和 OnBeholdOf 子元素必须定义为 WSSE UsernameTokens。此实用程序生成正确格式化的元素。 

package org.jboss.test.ws.jaxws.samples.wsse.policy.trust.shared;

import org.apache.cxf.helpers.DOMUtils;
import org.apache.cxf.message.Message;
import org.apache.cxf.ws.security.SecurityConstants;
import org.apache.cxf.ws.security.trust.delegation.DelegationCallback;
import org.apache.ws.security.WSConstants;
import org.apache.ws.security.message.token.UsernameToken;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import org.w3c.dom.ls.DOMImplementationLS;
import org.w3c.dom.ls.LSSerializer;

import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.UnsupportedCallbackException;
import java.io.IOException;
import java.util.Map;

/**
* A utility to provide the 3 different input parameter types for jaxws property
* "ws-security.sts.token.act-as" and "ws-security.sts.token.on-behalf-of".
* This implementation obtains a username and password via the jaxws property
* "ws-security.username" and "ws-security.password" respectively, as defined
* in SecurityConstants.  It creates a wss UsernameToken to be used as the
* delegation token.
*/

public class UsernameTokenCallbackHandler implements CallbackHandler {

   public void handle(Callback[] callbacks)
      throws IOException, UnsupportedCallbackException {
      for (int i = 0; i < callbacks.length; i++) {
         if (callbacks[i] instanceof DelegationCallback) {
            DelegationCallback callback = (DelegationCallback) callbacks[i];
            Message message = callback.getCurrentMessage();

            String username =
               (String)message.getContextualProperty(SecurityConstants.USERNAME);
            String password =
               (String)message.getContextualProperty(SecurityConstants.PASSWORD);
            if (username != null) {
               Node contentNode = message.getContent(Node.class);
               Document doc = null;
               if (contentNode != null) {
                  doc = contentNode.getOwnerDocument();
               } else {
                  doc = DOMUtils.createDocument();
               }
               UsernameToken usernameToken = createWSSEUsernameToken(username,password, doc);
               callback.setToken(usernameToken.getElement());
            }
         } else {
            throw new UnsupportedCallbackException(callbacks[i], "Unrecognized Callback");
         }
      }
   }

   /**
    * Provide UsernameToken as a string.
    * @param ctx
    * @return
    */
   public String getUsernameTokenString(Map<String, Object> ctx){
      Document doc = DOMUtils.createDocument();
      String result = null;
      String username = (String)ctx.get(SecurityConstants.USERNAME);
      String password = (String)ctx.get(SecurityConstants.PASSWORD);
      if (username != null) {
         UsernameToken usernameToken = createWSSEUsernameToken(username,password, doc);
         result = toString(usernameToken.getElement().getFirstChild().getParentNode());
      }
      return result;
   }

   /**
    *
    * @param username
    * @param password
    * @return
    */
   public String getUsernameTokenString(String username, String password){
      Document doc = DOMUtils.createDocument();
      String result = null;
      if (username != null) {
         UsernameToken usernameToken = createWSSEUsernameToken(username,password, doc);
         result = toString(usernameToken.getElement().getFirstChild().getParentNode());
      }
      return result;
   }

   /**
    * Provide UsernameToken as a DOM Element.
    * @param ctx
    * @return
    */
   public Element getUsernameTokenElement(Map<String, Object> ctx){
      Document doc = DOMUtils.createDocument();
      Element result = null;
      UsernameToken usernameToken = null;
         String username = (String)ctx.get(SecurityConstants.USERNAME);
      String password = (String)ctx.get(SecurityConstants.PASSWORD);
      if (username != null) {
         usernameToken = createWSSEUsernameToken(username,password, doc);
         result = usernameToken.getElement();
      }
      return result;
   }

   /**
    *
    * @param username
    * @param password
    * @return
    */
   public Element getUsernameTokenElement(String username, String password){
      Document doc = DOMUtils.createDocument();
      Element result = null;
      UsernameToken usernameToken = null;
      if (username != null) {
         usernameToken = createWSSEUsernameToken(username,password, doc);
         result = usernameToken.getElement();
      }
      return result;
   }

   private UsernameToken createWSSEUsernameToken(String username, String password, Document doc) {

      UsernameToken usernameToken = new UsernameToken(true, doc,
         (password == null)? null: WSConstants.PASSWORD_TEXT);
      usernameToken.setName(username);
      usernameToken.addWSUNamespace();
      usernameToken.addWSSENamespace();
      usernameToken.setID("id-" + username);

      if (password != null){
         usernameToken.setPassword(password);
      }

      return usernameToken;
   }


   private String toString(Node node) {
      String str = null;

      if (node != null) {
         DOMImplementationLS lsImpl = (DOMImplementationLS)
            node.getOwnerDocument().getImplementation().getFeature("LS", "3.0");
         LSSerializer serializer = lsImpl.createLSSerializer();
         serializer.getDomConfig().setParameter("xml-declaration", false); //by default its true, so set it to false to get String without xml-declaration
         str = serializer.writeToString(node);
      }
      return str;
   }

}
A.8.4.1.6. crypto 属性和密钥存储文件

ActA 服务必须提供自己的凭据。创建必要的 actasKeystore.properties 属性文件和 actasstore.jks 密钥存储。 

org.apache.ws.security.crypto.provider=org.apache.ws.security.components.crypto.Merlin
org.apache.ws.security.crypto.merlin.keystore.type=jks
org.apache.ws.security.crypto.merlin.keystore.password=aapass
org.apache.ws.security.crypto.merlin.keystore.alias=myactaskey
org.apache.ws.security.crypto.merlin.keystore.file=actasstore.jks
A.8.4.1.7. 默认 MANIFEST.MF

此应用程序需要访问 org.jboss.ws.cxf.jbossws-cxf 中提供的 JBossWS 和 Apache CXF API。在处理 ActAs 和 OnBehalfOf 扩展时，还需要 org.jboss.ws.cxf.sts 模块。dependency 语句指示服务器在部署时提供它们。 

Manifest-Version: 1.0
Dependencies: org.jboss.ws.cxf.jbossws-cxf-client, org.jboss.ws.cxf.sts
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