WebSphere Notes: Securing REST service using annotations

In the Security REST service using web.xml entry i talked about how you can protect a REST service by adding security-constraint element in the web.xml. But JAXRS provides annotations that would give you more granular control over the REST services. I wanted to try that feature so i changed the same ManageContactApp to use the javax.annotation.security annotations. You can download the sample application from here When the user tries to insert a new record he will get prompted for basic authentication like this

I followed these steps to build the sample application

First i did download the basic ManageContactApp.zip that provides REST interface and i tested it to make sure that it works

Next i used the instructions in Securing web application deployed in Jetty to make changes in Maven build file(pom.xml) to enable loginService in Jetty


<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>

Next create realm.properties file in ${basedir}/src/main/resources directory 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.

Next change the web.xml file to declare the ADMIN role and define BASIC authentication scheme for the web application 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>Jersey Web Application</servlet-name>
    <servlet-class>
	com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
    <init-param>
      <param-name>javax.ws.rs.Application</param-name>
      <param-value>com.webspherenotes.rest.ContactApplication</param-value>
    </init-param>

    <init-param>
      <param-name>com.sun.jersey.spi.container.ResourceFilters</param-name>
      <param-value>
	  com.sun.jersey.api.container.filter.RolesAllowedResourceFilterFactory</param-value>
    </init-param>
   
 <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>Jersey Web Application</servlet-name>
    <url-pattern>/rest/*</url-pattern>
  </servlet-mapping>


  <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>

By default the Jersey implementation does not look for security annotations in your REST service, in order for that to work you must set value of com.sun.jersey.spi.container.ResourceFilters init parameter to com.sun.jersey.api.container.filter.RolesAllowedResourceFilterFactory this filter takes care of parsing and understanding PermitAll, RolesAllowed and DenyAll annotations

The last step is to change the ContactService.java to use the security related annotations at individual class and method level


package com.webspherenotes.rest;

import java.util.List;

import javax.annotation.security.PermitAll;
import javax.annotation.security.RolesAllowed;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Query;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.FormParam;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Path("/contact")

public class ContactService {

  Logger logger = LoggerFactory.getLogger(ContactService.class);
  
  EntityManagerFactory entityManagerFactory;
  public ContactService(EntityManagerFactory entityManagerFactory){
    this.entityManagerFactory=entityManagerFactory;
  }

  @GET
  @Produces({MediaType.APPLICATION_JSON,MediaType.APPLICATION_XML})
  public List getContactList() {
    logger.debug("Entering ContactService.getContactList()");

    EntityManager entityManager = entityManagerFactory.createEntityManager();
    Query q = entityManager.createQuery("SELECT x from Contact x");
    logger.debug("Exiting ContactService.getContactList()");

    return (List) q.getResultList();
  }

  @GET
  @Path("/{contactId}")
  @Produces({MediaType.APPLICATION_JSON,MediaType.APPLICATION_XML})
  public Contact getContact(@PathParam("contactId") int contactId) {
    logger.debug("Entering ContactService.getContact() contactId" + contactId);

    EntityManager entityManager = entityManagerFactory.createEntityManager();
    Contact contact = entityManager.find(Contact.class, contactId);
    logger.debug("Exiting ContactService.getContact()" );

    return contact;
  }
  
  @POST
  @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
  @Produces({MediaType.APPLICATION_JSON,MediaType.APPLICATION_XML})
  @RolesAllowed("ADMIN")
  public Contact insertContact(@FormParam("contactId") int contactId,
      @FormParam("firstName") String firstName,
      @FormParam("lastName") String lastName,
      @FormParam("email") String email) {
    logger.debug("Entering ContactService.insertContact()");

    EntityManager entityManager = entityManagerFactory.createEntityManager();
    Contact contact = new Contact();
    contact.setContactId(contactId);
    contact.setFirstName(firstName);
    contact.setLastName(lastName);
    contact.setEmail(email);
    try{
    entityManager.getTransaction().begin();
    
    entityManager.persist(contact);
    entityManager.getTransaction().commit();
    }catch(Throwable t){
      if(entityManager.getTransaction().isActive())
        entityManager.getTransaction().rollback();
      contact = null;
    }finally{
      entityManager.close();
    }
    logger.debug("Exiting ContactService.insertContact()");
    return contact;
  }


  @PUT
  @Path("/{contactId}")
  @Produces({MediaType.APPLICATION_JSON,MediaType.APPLICATION_XML})
  @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
  @RolesAllowed("ADMIN")
  public Contact updateContact(@PathParam("contactId") int contactId,
      @FormParam("firstName") String firstName,
      @FormParam("lastName") String lastName,
      @FormParam("email") String email) {
    logger.debug("Entering ContactService.update() contactId" + contactId);

    EntityManager entityManager = entityManagerFactory.createEntityManager();
    Contact contact = new Contact();
    contact.setContactId(contactId);
    contact.setFirstName(firstName);
    contact.setLastName(lastName);
    contact.setEmail(email);
    try{
    entityManager.getTransaction().begin();
    entityManager.merge(contact);
    entityManager.getTransaction().commit();
    }catch(Throwable t){
      if(entityManager.getTransaction().isActive())
        entityManager.getTransaction().rollback();
      contact = null;
    }finally{
      entityManager.close();
    }
    logger.debug("Exiting ContactService.updateContact()");

    return contact;
  }

  @DELETE
  @Path("/{contactId}")
  @RolesAllowed("ADMIN")
  public void deleteContact(@PathParam("contactId") int contactId) {
    logger.debug("Entering ContactService.deleteContact() contactId " + contactId);
    EntityManager entityManager = entityManagerFactory.createEntityManager();
    try{
      entityManager.getTransaction().begin();
      Contact contact = entityManager.find(Contact.class, contactId);
      logger.debug("remove contact " + contact);
      entityManager.remove(contact);
      logger.debug("After removing " + contact);
      entityManager.getTransaction().commit();
      }catch(Throwable t){
        if(entityManager.getTransaction().isActive())
          entityManager.getTransaction().rollback();

      }finally{
        entityManager.close();
      }
    logger.debug("Exiting ContactService.deleteContact()");
  }

}

By default all the methods are accessible to user. But i did add @RolesAllowed("ADMIN") to insertContact(), updateContact() and deleteContact() method to say that only users who have admin rights can access these methods.

Securing REST service using annotations

No comments: