Chapter 33. Securing JAX-RS and RESTeasy

Because RESTEasy is deployed as a Servlet, you must use standard web.xml constraints to enable authentication and authorization.
Unfortunately, web.xml constraints have limited compatibility with JAX-RS because of the limited URL pattern matching available in web.xml. URL patterns in web.xml support only simple wildcards, so JAX-RS resources like the following: 
/{pathparam1}/foo/bar/{pathparam2}
Cannot be mapped as a web.xml URL pattern such as: 
/*/foo/bar/*
To work around this problem, use the following security annotations on your JAX-RS methods. You must also set up some general security constraint elements in web.xml to enable authentication.
RESTEasy JAX-RS supports the @RolesAllowed, @PermitAll and @DenyAll annotations on JAX-RS methods. By default, RESTEasy does not recognize these annotations. You must configure RESTEasy to enable role-based security by setting a context parameter, like so:

Note

Do not enable this if you are using EJBs. The EJB container will provide this function instead of RESTEasy. 
<web-app>
...
   <context-param>
      <context-name>resteasy.role.based.security</context-name>
      <context-value>true</context-value>
   </context-param>
</web-app>
With this approach, you must declare all roles used within both the RESTEasy JAX-RS WAR file, and in your JAX-RS classes, and establish a security constraint that lets these roles access every URL handled by the JAX-RS runtime, assuming that RESTEasy authorizes correctly.
RESTEasy authorization checks if a method is annotated with @RolesAllowed and then performs HttpServletRequest.isUserInRole. If one of the the @RolesAllowed passes, the request is allowed. If not, a response is returned with a 401 (Unauthorized) response code.
The following is an example of a modified RESTEasy WAR file. Note that every role declared is allowed access to every URL controlled by the RESTEasy Servlet. 

<web-app>

   <context-param>
      <context-name>resteasy.role.based.security</context-name>
      <context-value>true</context-value>
   </context-param>

   <listener>
      <listener-class>org.resteasy.plugins.server.servlet.ResteasyBootstrap</listener-class>
   </listener>

   <servlet>
      <servlet-name>Resteasy</servlet-name>
      <servlet-class>org.resteasy.plugins.server.servlet.HttpServletDispatcher</servlet-class>
   </servlet>

   <servlet-mapping>
      <servlet-name>Resteasy</servlet-name>
      <url-pattern>/*</url-pattern>
   </servlet-mapping>

   <security-constraint>
      <web-resource-collection>
         <web-resource-name>Resteasy</web-resource-name>
         <url-pattern>/security</url-pattern>
      </web-resource-collection>
       <auth-constraint>
         <role-name>admin</role-name>
         <role-name>user</role-name>
      </auth-constraint>
  </security-constraint>

   <login-config>
      <auth-method>BASIC</auth-method>
      <realm-name>Test</realm-name>
   </login-config>

   <security-role>
      <role-name>admin</role-name>
   </security-role>
   <security-role>
      <role-name>user</role-name>
   </security-role>


</web-app>