Securing web application deployed in Jetty

I wanted to figure out how to secure web application that is deployed in Jetty. Basic idea was i did create a UserServlet when user tries to access it he should be prompted for basic authentication and once user logs in check if he has admin role if yes then display "You have reached secure call" message, You can download the sample application from here This screen shot represents when user gets basic authentication prompt This is screen shot of screen that is displayed to the user after successful login I followed these steps to create the secured web application
  1. First i did create a UserServlet.java like this
    
    package com.webspherenotes.rest;
    import java.io.IOException;
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    public class UserServlet extends HttpServlet{
    
      @Override
      protected void doGet(HttpServletRequest req, HttpServletResponse resp)
          throws ServletException, IOException {
        resp.setContentType("text/html");
        resp.getWriter().println("You have reached secure call");
      }
    
    }
    
    
    This servlet has only doGet() method and when it gets control it writes You have reached secure call message in the output
  2. Next i changed the web.xml to protect the UserServlet so that it looks like this
    
    <!DOCTYPE web-app PUBLIC
     "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
     "http://java.sun.com/dtd/web-app_2_3.dtd" >
    
    <web-app>
      <display-name>Archetype Created Web Application</display-name>
      <servlet>
        <servlet-name>User</servlet-name>
        <servlet-class>com.webspherenotes.rest.UserServlet</servlet-class>
      </servlet>
      <servlet-mapping>
        <servlet-name>User</servlet-name>
        <url-pattern>/user</url-pattern>
      </servlet-mapping>
    
      <security-constraint>
        <web-resource-collection>
          <web-resource-name>user</web-resource-name>
          <url-pattern>/user</url-pattern>
          <http-method>GET</http-method>
        </web-resource-collection>
        <auth-constraint>
          <role-name>ADMIN</role-name>
        </auth-constraint>
      </security-constraint>
    
      <login-config>
        <auth-method>BASIC</auth-method>
        <realm-name>Default</realm-name>
      </login-config>
    
      <security-role>
        <role-name>ADMIN</role-name>
      </security-role>
    </web-app>
    
    The security-constraint element says that protect GET calls to /user url and allow only those users who have ADMIN user right to access the servlet. The login-config element defines Default as realm name
  3. Next change the maven build file to configure maven-compiler-plugin so that it uses login service
    
    <build>
      <finalName>JettySecurity</finalName>
      <plugins>
        <plugin>
          <groupId>org.mortbay.jetty</groupId>
          <artifactId>jetty-maven-plugin</artifactId>
          <version>7.4.5.v20110725</version>
          <configuration>
            <scanIntervalSeconds>10</scanIntervalSeconds>
            <webAppConfig>
              <contextPath>/JettySecurity</contextPath>
            </webAppConfig>
            <loginServices>
              <loginService implementation="org.eclipse.jetty.security.HashLoginService">
                <name>Default</name>
                <config>${basedir}/src/main/resources/realm.properties</config>
              </loginService>
            </loginServices> 
            <connectors>
              <connector implementation="org.eclipse.jetty.server.nio.SelectChannelConnector">
                <port>9000</port>
                <maxIdleTime>60000</maxIdleTime>
              </connector>
            </connectors>
          </configuration>
        </plugin>
      </plugins>
    </build>
    
    The loginService element asks Jetty to use list of users and passwords from ${basedir}/src/main/resources/realm.properties file to authenticate users
  4. Next create realm.properties file which looks like this
    
    guest:guest
    admin:admin,ADMIN
    
    This file has only 2 users first is guest and second is admin the admin user has ADMIN role.
Now if you deploy the application by executing mvn jetty:run and then try accessing http://localhost:9000/JettySecurity/user URL you will get prompted for login. If you login as admin, admin then you should be able to access the UserServlet. But if you login as guest then you should see this error page

2 comments:

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