JAAS參考資料中流行的文章是擴展JAAS實現類實例級授權
但它是基於JDK1.3，與目前的JDK1.4，JDK1.5不兼容，例如其中的配置如下：
The following assumes you are using JDK 1.3 and the files were extracted to
the d:JaasExample Directory. You will save some work by extracting the files
to this directory otherwise you will have to modify the policy and the ResourceSecurity.XML
policy files with the correct path names.
1) Copy the jaas.jar and the jaasmod.jar to your JDK jrelibext directory
(i.e. D:JDK1.3jrelibext).
2) Add the following to the end of the Java.security file located in JDK's
jrelibsecurity directory (i.e. D:JDK1.3jrelibsecurity):
auth.policy.provider=com.ibm.resource.security.auth.XMLPolicyFile
3) Execute the run.bat file.
1.4以後為policy.provider=PolicyFile。而且需要修改java.security文件
我經過2天的嘔血奮戰實現了不改變java VM環境和Web server環境，在struts下實現JAAS。
步驟如下：
1. welcome.jsp, index.jsp, struts-config.xml
<%@ taglib uri="/tags/struts-logic" prefix="logic" %>
<logic:redirect forward="index"/>
<%-- welcome.jsp
Redirect default requests to Welcome global ActionForward.
By using a redirect, the user-agent will change address to match the path of our Welcome ActionForward.
--%>
index.jsp
<%@ page contentType="text/Html; charset=UTF-8"%>
<%@ taglib uri="/tags/struts-bean" prefix="bean"%>
<%@ taglib uri="/tags/struts-html" prefix="html"%>
<%@ taglib uri="/tags/struts-logic" prefix="logic"%>
<html:html>
<Title>Logon</Title>
<body>
<html:form action="/LoginAction.do">
<p>User ID: <input type="text" name="userID" value="tyrone" /><br>
Passord: <input type="passWord" name="password" value="password"/><br>
<html:submit /></p>
</html:form>
</body>
</html:html>
struts-config.xml
<？xml version="1.0" encoding="ISO-8859-1" ？>
<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"
"http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">
<struts-config>
<!-- ================================================ Form Bean Definitions -->
<form-beans>
<!--2 Login formbean-->
<form-bean
name="LoginForm"
type="com.nova.colimas.web.form.LoginForm"/>
</form-beans>
<global-forwards>
<!-- Default forward to "Welcome" action -->
<!-- Demonstrates using index.jsp to forward -->
<forward
name="index"
path="/index.do"/>
</global-forwards>
<!-- =========================================== Action Mapping Definitions -->
<action-mappings>
<!-- Default "Welcome" action -->
<!-- Forwards to Welcome.jsp -->
<action path="/index"
type="com.nova.colimas.web.action.StartupServlet">
<forward name="sUCcess" path="/pages/index.jsp"/>
</action>
<!-- 2 Login -->
<action path="/LoginAction"
type="com.nova.colimas.web.action.LoginAction"
name="LoginForm"
scope="request"
input="/pages/indexcon.jsp"
validate="true">
<forward name="success" path="/pages/index.jsp"/>
<forward name="failure" path="/pages/index.jsp"/>
</action>
</action-mappings>
</struts-config>
2. 實現com.nova.colimas.web.action.StartupServlet用來初始化JAAS需要的系統屬性
public class StartupServlet extends Action {
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception{
// Initialization of the log
//LoggerFactory.setFactory(new EPricerLogFactory ());
//Log.info (this, "Startup of Settings application");
initJAAS();
return mapping.findForward("success");
}
//初始化JAAS需要的系統屬性
private void initJAAS(){
//set env variable
//用於認證JAASConstants接口內保存login.config文件地址 System.setProperty("java.security.auth.login.config",JAASConstants.AUTH_SECURITY_LOGINFILE);
}
} public interface JAASConstants {
String AUTH_SECURITY_POLICYXMLFILE="D:MyProjectcolimasclms-webcolimassecurity-policy.xml";
String AUTH_SECURITY_LOGINFILE="D:MyProjectcolimasclms-webcolimaslogin.config";
String AUTH_SECURITY_MODULENAME="ColimasLogin";
} Login.config文件內容：
ColimasLogin {
com.nova.colimas.security.auth.ColimasLoginModule required debug=true;
}; 3.實現ColimasLoginModule登錄模塊
/*
* Created on 2005/07/01
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
package com.nova.colimas.security.auth;
import java.util.*;
import javax.security.auth.*;
import javax.security.auth.callback.*;
import javax.security.auth.login.*;
import javax.security.auth.spi.LoginModule;
//import java.security.*;
//import org.w3c.dom.traversal.*;
import org.w3c.dom.*;
//import org.apache.XPath.*;
/**
* @author tyrone
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
public class ColimasLoginModule implements LoginModule {
private Subject subject;
private CallbackHandler callbackHandler;
private boolean debug = false;
private boolean succeeded = false;
private boolean commitSucceeded = false;
private String username;
private char[] password;
/**
* Initializes the <code>LoginModule</code>.
*
* @param subject the <code>Subject</code> to be authenticated.
*
* @param callbackHandler a <code>CallbackHandler</code> for
* prompting and retrieving the userid and password from the user.
*
* @param sharedState shared <code>LoginModule</code> state.
*
* @param options options specified in the login configuration
* file for this <code>LoginModule</code>.
*/
public void initialize(Subject subject, CallbackHandler callbackHandler, Map sharedState, Map options) {
this.subject = subject;
this.callbackHandler = callbackHandler;
// initialize configuration options
debug = "true".equalsIgnoreCase((String) options.get("debug"));
}
/**
* Prompts the user for a userid and password.
*
* @return true if the authentication succeeded,
* or false if this LoginModule should be ignored
*
* @exception FailedLoginException if the authentication fails.
*
* @exception LoginException if the <code>LoginModule</code>
* is unable to authenticate.
*/
public boolean login() throws LoginException {
if (callbackHandler == null)
throw new LoginException("Error: CallbackHandler cannot be null");
Callback[] callbacks = new Callback[2];
callbacks[0] = new NameCallback("userid: ");
callbacks[1] = new PasswordCallback("password: ", false);
try {
callbackHandler.handle(callbacks);
username = ((NameCallback) callbacks[0]).getName();
char[] tmpPassword = ((PasswordCallback) callbacks[1]).getPassword();
if (tmpPassword == null) {
// treat a NULL password as an empty password
tmpPassword = new char[0];
}
password = new char[tmpPassword.length];
System.arraycopy(tmpPassword, 0, password, 0, tmpPassword.length);
((PasswordCallback) callbacks[1]).clearPassword();
} catch (java.io.IOException e) {
throw new LoginException(e.getMessage());
} catch (UnsupportedCallbackException e) {
throw new LoginException("Error: " + e.getMessage());
}
if(debug) {
//System.out.println("ColimasLoginModule: userid = " + username);
String pwd = new String(password);
System.out.println("ColimasLoginModule: password = " + pwd);
}
// Check the userid and password
if (isValidUser(username, password)) {
// authentication succeeded
if(debug)
System.out.println("ColimasLoginModule: authentication succeeded");
succeeded = true;
return true;
} else {
// authentication failed
if(debug)
System.out.println("ColimasLoginModule: authentication failed");
succeeded = false;
// clear the values
username = null;
password = null;
throw new FailedLoginException("Invalid userid or password");
}
}
/**
* This method is called if the LoginContext's overall authentication
* succeeded (the relevant REQUIRED, REQUISITE, SUFFICIENT and
* OPTIONAL LoginModules succeeded).
* <p>
* If this LoginModule's own authentication attempt succeeded
* (checked by retrieving the private state saved by the
* <code>login</code> method), then this method associates the
* relevant <code>PrincipAlexamples</code> with the
* <code>Subject</code> located in the <code>LoginModule</code>.
* If this LoginModule's own authentication attempted failed, then
* this method removes any state that was originally saved.
*
* @exception LoginException if the commit fails.
*
* @return true if this LoginModule's own login and commit attempts
* succeeded, or false otherwise.
*/
public boolean commit() throws LoginException {
if(succeeded == false)
return false;
subject.getPrincipals().add(new PrincipalUser(username));
subject.getPrincipals().addAll(getUserRoles(username));
username = null;
password = null;
commitSucceeded = true;
return true;
}
/**
* This method is called if the LoginContext's overall
* authentication failed. (the relevant REQUIRED, REQUISITE,
* SUFFICIENT and OPTIONAL LoginModules did not succeed).
* <p>
* If this LoginModule's own authentication attempt succeeded
* (checked by retrieving the private state saved by the
* <code>login</code> and <code>commit</code> methods),
* then this method cleans up any state that was originally
* saved.
*
* @exception LoginException if the abort fails.
*
* @return false if this LoginModule's own login and/or commit attempts
* failed, and true otherwise.
*/
public boolean abort() throws LoginException {
if (succeeded == false)
return false;
if(succeeded == true && commitSucceeded == false) {
// login succeeded but overall authentication failed
succeeded = false;
username = null;
password = null;
} else {
// overall authentication succeeded and commit
// succeeded, but someone else's commit failed.
Logout();
}
return true;
}
/**
* Logouts a Subject.
* <p>
* This method removes the <code>PrincipalExample</code>
* instances that were added by the <code>commit</code>
* method.
*
* @exception LoginException if the Logout fails.
*
* @return true if this method succeeded, or false if this
* LoginModule should be ignored.
*/
public boolean Logout() throws LoginException {
subject.getPrincipals().clear();
succeeded = false;
succeeded = commitSucceeded;
username = null;
password = null;
return true;
}
/**
* Searches the users XML file for the specified
* userid and password.
*/
private boolean isValidUser(String uid, char[] passwd) {
try {
/*get userid and password from db */
String name="tyrone1979";
String password="197913";
if (uid.equals(name)){
if (password.equals(new String(password)))
return true;
}
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e.getMessage());
}
return false;
}
/**
* Searches the user's group XML file and returns a
* collection of PrincipalExamples for each group
* a user is a member of.
*/
private Collection getUserRoles(String username) {
Collection collection =null;
try {
/*
get Roles from db
*/
ArrayList roles=new ArrayList();
roles.add(new PrincipalUser("00001"));
collection=roles;
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e.getMessage());
}
return collection;
}
}
4. callback類
public class LoginCallbackHandler implements CallbackHandler {
private String name=null;
private String password=null;
public LoginCallbackHandler(String name,String password){
super();
this.name=name;
this.password=password;
}
/**
* @see CallbackHandler#handle(Callback[])
*/
public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {
for (int i = 0; i < callbacks.length; i++) {
if (callbacks[i] instanceof TextOutputCallback) {
TextOutputCallback textOutputCallback = (TextOutputCallback) callbacks[i];
switch (textOutputCallback.getMessageType()) {
case TextOutputCallback.INFORMATION :
//System.out.println(textOutputCallback.getMessage());
break;
case TextOutputCallback.ERROR :
//System.out.println("ERROR: " + textOutputCallback.getMessage());
break;
case TextOutputCallback.WARNING :
//System.out.println("WARNING: " + textOutputCallback.getMessage());
break;
default :
throw new IOException("Invalid message type: " + textOutputCallback.getMessageType());
}
} else if(callbacks[i] instanceof NameCallback) {
// prompt the user for a userid
NameCallback nc = (NameCallback) callbacks[i];
nc.setName(this.name);
} else if(callbacks[i] instanceof PasswordCallback) {
// prompt the user for the password
PasswordCallback pc = (PasswordCallback) callbacks[i];
pc.setPassword(this.password.toCharArray());
} else {
throw new UnsupportedCallbackException(callbacks[i], "Invalid Callback");
}
}
}
} 5.com.nova.colimas.web.action.LoginAction類，實現認證
public class LoginAction extends Action {
LoginContext loginContext=null;
LoginForm loginForm=null;
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception{
/**
* 1 get Login form Bean
* 2 get the value
* 3 call JAAS Login Module
*/
try {
loginForm=(LoginForm)form;
loginContext=new LoginContext(JAASConstants.AUTH_SECURITY_MODULENAME, new LoginCallbackHandler(loginForm.getUserID(),loginForm.getPassword()));
}catch(SecurityException e){
e.printStackTrace();
} catch (LoginException e) {
e.printStackTrace();
//System.exit(-1);
}
// Authenticate the user
try {
loginContext.login();//先運行ColimasLoginModule的initialize(Subject, CallbackHandler, Map, Map)方法，然後運行ColimasLoginModule的login()
System.out.println("
Creating a new UserProfile...");
System.out.println("Successfully!
");
} catch (Exception e) {
System.out.println("Unexpected Exception - unable to continue");
e.printStackTrace();
//System.exit(-1);
return mapping.findForward("failure");
}
return mapping.findForward("success");
}
}
