Re: ASP.NET Impersonation, XmlUrlResolver, and DefaultCredentials

From: Colin Bowern (colin.bowern_at_nospam.indimensions.com)
Date: 01/09/04

  • Next message: Felix Wang: "Re: HTML Text encoding of web controls" 
    Date: Fri, 9 Jan 2004 10:45:17 -0500

    Anyone have any thoughts on how to get the user credentials to pass through
    without manually creating a NetworkCredential object?

    Thanks!
    Colin

    "Colin Bowern" <colin.bowern@nospam.indimensions.com> wrote in message
    news:OLGkxoX0DHA.1764@TK2MSFTNGP10.phx.gbl...
    > 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
    > >
    > >
    >
    >

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