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C# - Impersonate Context Question

Posted on 2009-05-04
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Last Modified: 2012-05-06
I have a console application where I have to use impersonate to access a network directory.  I then have code that loops though all the files in a directory on that network server.  After a few minutes sometimes not all it throws a System.IO.Exception - the specified network path is no longer available.  Any idea if this is possibly a impersonate issue and what I can change?  Below is the code in an impersonate.cs class I have that I call first before running the code and here is the exact stack trace:

at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)\r\n   at System.IO.Directory.InternalGetFileDirectoryNames(String path, String userPathOriginal, String searchPattern, Boolean includeFiles, Boolean includeDirs, SearchOption searchOption)\r\n   at System.IO.DirectoryInfo.GetFiles(String searchPattern, SearchOption searchOption)\r\n   at System.IO.DirectoryInfo.GetFiles(String searchPattern)\r\n   at BillRunPowerCleanup.Proram.CleanupMacOldPDFs() in C:\\Applications\\BillRunPower\\BillRunPowerCleanup\\BillRunPowerCleanup\\Program.cs:line 56"
public class Impersonator
    {
        public WindowsImpersonationContext impersonationContext;
        
        [DllImport("advapi32.dll")]
        public static extern int LogonUser(String lpszUsername, String lpszDomain,
        String lpszPassword,
        int dwLogonType, int dwLogonProvider, ref IntPtr phToken);
 
        [DllImport("kernel32.dll")]
        public extern static bool CloseHandle(IntPtr hToken);
 
        public bool Impersonate(string userName, string domain, string password)
        {
        WindowsIdentity tempWindowsIdentity;
        IntPtr token = IntPtr.Zero;
        IntPtr tokenDuplicate = IntPtr.Zero;
        // request default security provider a logon token with LOGON32_LOGON_NEW_CREDENTIALS
        // token returned is impersonation token, no need to duplicate
        if(LogonUser(userName, domain, password, 9, 0, ref token) != 0)
        {
        tempWindowsIdentity = new WindowsIdentity(token);
        impersonationContext = tempWindowsIdentity.Impersonate();
        // close impersonation token, no longer needed
        CloseHandle(token);
        if (impersonationContext != null)
        return true;
        }
        return false; // Failed to impersonate.
        }
 
    }

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Question by:sbornstein2
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1 Comment
 
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kaylanreilor earned 2000 total points
ID: 24351599
I don't see the connection with an impersonation issue. The impersonation will help to be allowed to access the shared folder.
To test it you should remove the impersonation code a set a permission on the folder to everyone. Thus I guess you will experience the same problem.
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