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From "Craig R. McClanahan" <craig...@apache.org>
Subject Re: Declarative security in struts
Date Sun, 02 May 2004 03:56:29 GMT
Chaikin, Yaakov Y (US SSA) wrote:

>Hi,
>
>I am pretty new to Struts. Looked through the archives and wasn't sure
>what the current answer would be to my question.
>
>Is there a way to use Struts while using the declarative approach to
>security? Not to add another user, but simply to secure your application
>resources. Or one of the side-effects of Struts is that you are forced
>to either extend ActionServlet or do something similar and therefore not
>use declarative security provided by the container?
>
>Your help in clarifying this matter would be greatly appreciated.
>  
>
If you are already using container-managed security (i.e. 
<security-constraint> elements in the web.xml file), then you have the 
following basic options:

* If the resources you are worried about are static things like HTML pages
  and images, define security constraints for them in the usual way.  This
  has nothing to do with Struts; it's just standard practice for 
container managed
  security.

* If the resources you are worried about are Struts actions, there are two
  fundamental (but non-exclusive) approaches:

  - You can define a security constraint that protects the particular
    Struts action you are worried about.  For example, if you are using
    extension mapping and you want to protect the "/foo" action, you would
    create a security constraint for URL "/foo.do".

  - You can include a "role" attribute in the <action> element, which asks
    Struts to ensure that the user has the appropriate role before Struts
    allows him or her to execute this action.

  - You can check inside your Action.execute() method for a particular
    role, by calling the servlet-standard request.isUserInRole() method.

* Your concern isn't that a user can display a particular page; it's 
that you
  want to dynamically limit the contents of the page based on security
  constraints:

  - In the action, you can use request.isUserInRole() as above.

  - In a JSP page, you can use <logic:present role="..."/> around
    the markup that should be generated only if you have one of the
    roles specified.

As you can see, there are pretty comprehensive facilities in Struts to 
leverage container managed security to meet your needs.

Craig McClanahan



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