ADSI and DirectoryServices Security issue

From: Marcus Müller (marcusmueller_at_gmx.de)
Date: 06/30/03 

Date: Mon, 30 Jun 2003 15:13:02 +0200

Hi,

I have a problem using DirectoryServices (ADSI) with ASP.DOT.
The following function returns the mime description of a file extension (a
reference to the "Active DS Type Library" COM object is required):

using System.DirectoryServices;
using System.IO;
private string MimeType(string sFile)
{
    string sExtension = Path.GetExtension(sFile);
    DirectoryEntry cMimeMap = new DirectoryEntry("IIS://LocalHost/MimeMap");
    object[] arMimeMap = (object[])cMimeMap.Invoke("GetEx", "MimeMap");
    foreach(IISOle.IISMimeType cMimeType in arMimeMap)
        if(cMimeType.Extension == sExtension)
            return cMimeType.MimeType;
                return "application/octet-stream";
}

I was only able to get access to the mime map if <identity
impersonate='true'/> was set in the web.config file and IUSR_MACHINE was a
member of the administrator group. These securtiy settings are quite unsafe
and not applicable for a production system.

Hence, does anybody have a solution how to access ADSI without changing the
IIS account security settings or, even better, how to access the IIS mime
map without ADSI ?

Many thanks in advance.

Marcus

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