Unauthorized access and NOT redirecting to the login page

Question

3.00/5 (2 votes)

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My website is using forms authentication. I have this in the root web.config (with some changes for security purposes):

HTML

<authentication mode="Forms">
  <forms loginUrl="~/Login/Default.aspx" name=".MyAuthCookie" 
    defaultUrl="~/Secured/Default.aspx" enableCrossAppRedirects="true" 
    protection="All" path="/" timeout="30" />
</authentication>

This works great: when an unauthenticated user tries to access the site, he is directed to the login page.

I have several folders that are restricted using their own very short web.config files, like this:

XML

<?xml version="1.0"?>
<configuration>
  <system.web>
    <authorization lockItem="true">
      <allow roles="Administrator, Executive"/>
      <allow users="User1, User2"/>
      <deny users="*"/>
    </authorization>
  </system.web>
</configuration>

This also works great: when someone other than an allowed user or role tries to access a file in the folder, they are denied.

My problem is that IIS treats the denied user as if he was unauthenticated, and redirects him to the login page. The behavior I want is to recognize that he is authenticated, just not authorized, and redirect him to a page that says "Permission denied."

I have custom errors enabled, and the 401 status is redirected to a page called "NoPermission.aspx". Unfortunately, it is not being caught.

Suggestions?

Posted 23-Jan-12 7:27am

Gregory Gadow

Updated 23-Jan-12 7:28am

v2

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Sriram Chitturi · Accepted Answer · 2012-01-23T15:31:00

The UrlAuthorizationModule takes care of the authorization and this can be handled only in global.asax file.
In your global.asax file add the following code -

C#

void Application_AuthorizeRequest(Object sender, EventArgs e)
    {
        if (Request.IsAuthenticated && (Request.HttpMethod == "GET") &&  !string.IsNullOrEmpty(Request["ReturnUrl"]))
        {
            Response.Redirect("~/NoAccess.aspx");
        }
    }