Question

When I tried to access network drive file from local its working fine but when i deploy the code I am getting bellow error

at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy)

at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)

at System.Web.HttpResponse.WriteFile(String filename, Boolean readIntoMemory)

at System.Web.HttpResponse.WriteFile(String filename)

at Configs.gvConfigs_RowCommand(Object sender, GridViewCommandEventArgs e) in C:\Users\bpucha1103c\Desktop\CellBackHaul_Publish\Configs.aspx.cs:line 59
2013-02-05 13:31:21,412 [19] WARN System.Web.UI.Page [(null)] – Logging:System.IO.IOException: The account used is a computer account. Use your global user account or local user account to access this server.

how to do impersonation when accessing the file in network shared folder? Below is my code

GridViewRow rw = (GridViewRow)(((LinkButton)e.CommandSource).NamingContainer);
LinkButton lnkTxtFile = (LinkButton)rw.FindControl("lnkTxtFile");
string strFilename = lnkTxtFile.Text.Replace("/","\\");
System.IO.FileInfo targetFile = new System.IO.FileInfo(strFilename);
Response.Clear();
Response.AddHeader("Content-Disposition", "attachment; filename=" + targetFile.Name);
Response.ContentType = "application/octet-stream";
Response.WriteFile(targetFile.FullName);
//HttpContext.Current.ApplicationInstance.CompleteRequest();
Response.End();

here is my modified code

GridViewRow rw = (GridViewRow)(((LinkButton)e.CommandSource).NamingContainer);
LinkButton lnkTxtFile = (LinkButton)rw.FindControl("lnkTxtFile");
string strFilename = lnkTxtFile.Text.Replace("/", "\\");
System.IO.FileInfo targetFile = new System.IO.FileInfo(strFilename);
RunOperationAsUser(() =>
{
  //GridViewRow rw = (GridViewRow)(((LinkButton)e.CommandSource).NamingContainer);
  //LinkButton lnkTxtFile = (LinkButton)rw.FindControl("lnkTxtFile");
  //string strFilename = lnkTxtFile.Text.Replace("/", "\\");
  //System.IO.FileInfo targetFile = new System.IO.FileInfo(strFilename);
  Response.Clear();
  Response.AddHeader("Content-Disposition", "attachment; filename=" + targetFile.Name);
  Response.ContentType = "application/octet-stream";
  Response.WriteFile(targetFile.FullName);
  //HttpContext.Current.ApplicationInstance.CompleteRequest();
  Response.End();
}, "bpucha1103c", targetFile.DirectoryName , "White1234");

Answer 1

You can try to use the following code to impersonate as another user and run an action:

[DllImport("advapi32.dll", SetLastError = true)]
private static extern bool LogonUser(string lpszUsername, string lpszDomain, string lpszPassword, int dwLogonType, int dwLogonProvider, ref IntPtr phToken);
[DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public extern static bool DuplicateToken(IntPtr existingTokenHandle, int impersonationLevel, ref IntPtr duplicateTokenHandle);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern bool CloseHandle(IntPtr handle);
[DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool RevertToSelf();
[DllImport("userenv.dll", SetLastError = true, CharSet = CharSet.Auto)]
public static extern bool LoadUserProfile(IntPtr hToken, ref ProfileInfo lpProfileInfo);

[DllImport("Userenv.dll", CallingConvention =
    CallingConvention.Winapi, SetLastError = true, CharSet = CharSet.Auto)]
public static extern bool UnloadUserProfile
    (IntPtr hToken, IntPtr lpProfileInfo);

[DllImport("ole32.dll")]
public static extern int CoInitializeSecurity(IntPtr pVoid, int
    cAuthSvc, IntPtr asAuthSvc, IntPtr pReserved1, RpcAuthnLevel level,
    RpcImpLevel impers, IntPtr pAuthList, EoAuthnCap dwCapabilities, IntPtr
    pReserved3);

[StructLayout(LayoutKind.Sequential)]
public struct ProfileInfo
{
    ///
    /// Specifies the size of the structure, in bytes.
    ///
    public int dwSize;

    ///
    /// This member can be one of the following flags: 
    /// PI_NOUI or PI_APPLYPOLICY
    ///
    public int dwFlags;

    ///
    /// Pointer to the name of the user.
    /// This member is used as the base name of the directory 
    /// in which to store a new profile.
    ///
    public string lpUserName;

    ///
    /// Pointer to the roaming user profile path.
    /// If the user does not have a roaming profile, this member can be NULL.
    ///
    public string lpProfilePath;

    ///
    /// Pointer to the default user profile path. This member can be NULL.
    ///
    public string lpDefaultPath;

    ///
    /// Pointer to the name of the validating domain controller, in NetBIOS format.
    /// If this member is NULL, the Windows NT 4.0-style policy will not be applied.
    ///
    public string lpServerName;

    ///
    /// Pointer to the path of the Windows NT 4.0-style policy file. 
    /// This member can be NULL.
    ///
    public string lpPolicyPath;

    ///
    /// Handle to the HKEY_CURRENT_USER registry key.
    ///
    public IntPtr hProfile;
}

public enum RpcAuthnLevel
{
    Default = 0,
    None = 1,
    Connect = 2,
    Call = 3,
    Pkt = 4,
    PktIntegrity = 5,
    PktPrivacy = 6
}

public enum RpcImpLevel
{
    Default = 0,
    Anonymous = 1,
    Identify = 2,
    Impersonate = 3,
    Delegate = 4
}

public enum EoAuthnCap
{
    None = 0x00,
    MutualAuth = 0x01,
    StaticCloaking = 0x20,
    DynamicCloaking = 0x40,
    AnyAuthority = 0x80,
    MakeFullSIC = 0x100,
    Default = 0x800,
    SecureRefs = 0x02,
    AccessControl = 0x04,
    AppID = 0x08,
    Dynamic = 0x10,
    RequireFullSIC = 0x200,
    AutoImpersonate = 0x400,
    NoCustomMarshal = 0x2000,
    DisableAAA = 0x1000
}

const int LOGON32_PROVIDER_DEFAULT = 0;
const int LOGON32_LOGON_NEW_CREDENTIALS = 9;
const int SECURITY_IMPERSONATION_LEVEL = 2;

public void RunOperationAsUser(Action operation, string userName, string domain, string password)
{
    IntPtr token = IntPtr.Zero;
    IntPtr dupToken = IntPtr.Zero;

    //Impersonate the user
    if (LogonUser(userName, domain, password, LOGON32_LOGON_NEW_CREDENTIALS, LOGON32_PROVIDER_DEFAULT, ref token))
    {
        if (DuplicateToken(token, SECURITY_IMPERSONATION_LEVEL, ref dupToken))
        {

            WindowsIdentity newIdentity = new WindowsIdentity(dupToken);
            WindowsImpersonationContext impersonatedUser = newIdentity.Impersonate();

            int retCode = CoInitializeSecurity(IntPtr.Zero, -1, IntPtr.Zero, IntPtr.Zero,
                RpcAuthnLevel.PktPrivacy, RpcImpLevel.Impersonate, IntPtr.Zero, EoAuthnCap.DynamicCloaking, IntPtr.Zero);

            if (impersonatedUser != null)
            {
                var username = WindowsIdentity.GetCurrent(TokenAccessLevels.MaximumAllowed).Name;
                var sid = WindowsIdentity.GetCurrent(TokenAccessLevels.MaximumAllowed).User.Value;

                ProfileInfo profileInfo = new ProfileInfo();
                profileInfo.dwSize = Marshal.SizeOf(profileInfo);
                profileInfo.lpUserName = userName;
                profileInfo.dwFlags = 1;

                Boolean loadSuccess = LoadUserProfile(dupToken, ref profileInfo);
            }

            operation();

            impersonatedUser.Undo();
        }
    }
    if (token != IntPtr.Zero)
    {
        CloseHandle(token);
    }
    if (dupToken != IntPtr.Zero)
    {
        try
        {
            CloseHandle(token);
        }
        catch
        { }
    }
}

now you can do

RunOperationAsUser(() => {
    GridViewRow rw = (GridViewRow)(((LinkButton)e.CommandSource).NamingContainer);
    LinkButton lnkTxtFile = (LinkButton)rw.FindControl("lnkTxtFile");
    string strFilename = lnkTxtFile.Text.Replace("/","\\");
    System.IO.FileInfo targetFile = new System.IO.FileInfo(strFilename);
    Response.Clear();
    Response.AddHeader("Content-Disposition", "attachment; filename=" + targetFile.Name);
    Response.ContentType = "application/octet-stream";
    Response.WriteFile(targetFile.FullName);
    //HttpContext.Current.ApplicationInstance.CompleteRequest();
    Response.End();
}, userName, domain, password)