Get current request's credentials for using in WebRequest

Question

When accessing my site, the user has to enter his credentials. They are basically plain directory access credentials. At a certain point I check if a certain file they want to download exists by calling

WebRequest req = HttpWebRequest.Create(checkUri.AbsoluteUri);
WebResponse res = req.GetResponse();

Although I can access the checkUri from the browser, I get a 401 when doing the above check. I think I have to set the

req.Credentials

But I don't know where the current credentials are stored...

Any ideas?

--Update--

• Integrated Windows Authentication: No
• Allow Anonymous: Off
• Caler: Link on page of same site (GET)
• Impersonation: default is off (don't even know how to enable it in asp.net mvc)

Answer 1

I think you want this:

req.Credentials = CredentialCache.DefaultCredentials;

Answer 2

You're going to need to enable Integrated Windows Authentication.

I don't know what happens in ASP.NET MVC, but in ASP.NET Web Forms impersonation is turned on by:

<identity impersonate="true">

in web.config.

Answer 3

I was having a similar problem on a site where I'm using forms authentication, I was able to solve this problem by using the code provided here as the second reply in the thread.

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(uri);
// Add the current authentication cookie to the request
HttpCookie cookie = HttpContext.Current.Request.Cookies[FormsAuthentication.FormsCookieName];
Cookie authenticationCookie = new Cookie(
    FormsAuthentication.FormsCookieName,
    cookie.Value,
    cookie.Path,
    HttpContext.Current.Request.Url.Authority);

req.CookieContainer = new CookieContainer();
req.CookieContainer.Add(authenticationCookie);

WebResponse res = req.GetResponse();