Re: ASP.NET Impersonation, XmlUrlResolver, and DefaultCredentials

From: Colin Bowern (colin.bowern_at_nospam.indimensions.com)
Date: 01/02/04 

Date: Fri, 2 Jan 2004 16:48:42 -0500

Just a quick follow up, I should note that it works when I manually pass
credentials:

Dim myCreds As New NetworkCredential("myuser", "mypassword", "mydomain")
Dim myCache As New CredentialCache
myCache.Add(New Uri("http://dev.mydomain.net/"), "Basic", myCreds)
resolver.Credentials = myCache

But I don't want to have to embed credentials in code, which is why I was
hoping Basic/Windows Authentication would take care of the issue. The
virtual directory holding the application has anonymous authentication
turned off.

Cheers!
Colin

"Colin Bowern" <colin.bowern@nospam.indimensions.com> wrote in message
news:...
> I'm trying to write an ASP.NET page that does on-the-fly XML/XSL
> transformation. The code is as follows:
>
> ---
> Dim xmlPath As String = Request.QueryString("xml")
> Dim xslPath As String = Request.QueryString("xsl")
>
> If (Len(xmlPath) <= 0) Or (Len(xslPath) <= 0) Then
> Response.Write("xml or xsl query string parameter missing")
> Response.End()
> End If
>
> Dim xtr As New XmlTextReader(xmlPath)
> Dim resolver As XmlUrlResolver = New XmlUrlResolver
> Dim doc As New XmlDocument
>
> resolver.Credentials = CredentialCache.DefaultCredentials
> xtr.XmlResolver = resolver
> doc.Load(xtr)
>
> Dim transform As New XslTransform
> transform.Load(xslPath, resolver)
>
> transform.Transform(doc, Nothing, Response.Output, resolver)
> ---
>
> When I run this on my local dev box and request an xml document and xsl
> style*** page from our development server which is running Windows
> SharePoint Services it works great. When I publish the application to the
> development server it doesn't seem to work. Instead I'm getting:
>
> ---
> Server Error in '/tools/transformxml' Application.
> -------------------------------------------------------------------------- 

--
> ----
>
> The remote server returned an error: (401) Unauthorized.
> Description: An unhandled exception occurred during the execution of the
> current web request. Please review the stack trace for more information
> about the error and where it originated in the code.
>
> Exception Details: System.Net.WebException: The remote server returned an
> error: (401) Unauthorized.
>
> Source Error:
>
> Line 39:         resolver.Credentials = CredentialCache.DefaultCredentials
> Line 40:         xtr.XmlResolver = resolver
> Line 41:         doc.Load(xtr)
> Line 42:
> Line 43:         ' Instantiate the XslTransform Object
>
>
> Source File: c:\inetpub\devroot\tools\transformxml\inline.aspx    Line: 41
>
> Stack Trace:
>
> [WebException: The remote server returned an error: (401) Unauthorized.]
>    System.Net.HttpWebRequest.CheckFinalStatus() +676
>    System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult) +139
>    System.Net.HttpWebRequest.GetResponse() +147
>    System.Xml.XmlDownloadManager.GetNonFileStream(Uri uri, ICredentials
> credentials) +65
>    System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials
> credentials) +94
>    System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type
> ofObjectToReturn) +55
>    System.Xml.XmlTextReader.CreateScanner() +384
>    System.Xml.XmlTextReader.Init() +23
>    System.Xml.XmlTextReader.Read() +530
>    System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean
> preserveWhitespace) +80
>    System.Xml.XmlDocument.Load(XmlReader reader) +72
>    ASP.inline_aspx.__Render__control1(HtmlTextWriter __output, Control
> parameterContainer) in
c:\inetpub\devroot\tools\transformxml\inline.aspx:41
>    System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +27
>    System.Web.UI.Control.Render(HtmlTextWriter writer) +7
>    System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +243
>    System.Web.UI.Page.ProcessRequestMain() +1929
>
>
> --------------------------------------------------------------------------
--
> ----
> Version Information: Microsoft .NET Framework Version:1.1.4322.573;
ASP.NET
> Version:1.1.4322.573
> ---
>
> Checking out the IIS logs I that the code is making a request to the page
> without any credentials.  Notable entries in the web.config include:
>
> ---
> <authentication mode="Windows" />
> <identity impersonate="true" />
> <authorization>
>  <deny users="?" />
> </authorization>
> ---
>
> I've got through KB article 306158 and I still can't seem to resolve this
> issue.  Any thoughts on what might prevent the XmlTextReader from pulling
> the document?
>
> Thanks!
> Colin
>
>