Hello
I found some threads regarding this issue but still unable to resolve this problem.
I’m using ImpersonationContext class for the impersonation :
///
<summary>
/// Leverages the Windows API (advapi32.dll) to programmatically impersonate
a user.
///
</summary>
public
class
ImpersonationContext :
IDisposable
{
#region constants
private
const
int LOGON32_LOGON_INTERACTIVE = 2;
private
const
int LOGON32_PROVIDER_DEFAULT = 0;
#endregion
#region global variables
private
WindowsImpersonationContext impersonationContext;
private
bool impersonating;
#endregion
#region unmanaged code
[DllImport("advapi32.dll")]
private
static
extern
int LogonUserA(String
lpszUserName, String lpszDomain,
String lpszPassword,
int dwLogonType,
int dwLogonProvider,
ref
IntPtr phToken);
[DllImport("advapi32.dll",
CharSet = CharSet.Auto, SetLastError =
true)]
private
static
extern
int DuplicateToken(IntPtr
hToken, int impersonationLevel,
ref
IntPtr hNewToken);
[DllImport("advapi32.dll",
CharSet = CharSet.Auto, SetLastError =
true)]
private
static
extern
bool RevertToSelf();
[DllImport("kernel32.dll",
CharSet = CharSet.Auto)]
private
static
extern
bool CloseHandle(IntPtr
handle);
#endregion
#region constructors
public ImpersonationContext()
{
impersonating = false;
}
///
<summary>
/// Overloaded constructor and begins impersonating.
///
</summary>
public ImpersonationContext(string
userName, string password,
string domain)
{
this.BeginImpersonationContext(userName, password, domain);
}
#endregion
#region impersonation methods
///
<summary>
/// Begins the impersonation context for the specified user.
///
</summary>
///
<remarks>Don't call this method if you used the overloaded constructor.</remarks>
public
void BeginImpersonationContext(string
userName, string password,
string domain)
{
//initialize token and duplicate variables
IntPtr token =
IntPtr.Zero;
IntPtr tokenDuplicate =
IntPtr.Zero;
if (RevertToSelf())
{
if (LogonUserA(userName, domain, password, LOGON32_LOGON_INTERACTIVE,
LOGON32_PROVIDER_DEFAULT, ref token) != 0)
{
if (DuplicateToken(token, 2,
ref tokenDuplicate) != 0)
{
using (WindowsIdentity
tempWindowsIdentity = new
WindowsIdentity(tokenDuplicate))
{
//begin the impersonation context and mark impersonating true
impersonationContext = tempWindowsIdentity.Impersonate();
impersonating = true;
}
}
}
}
//close the handle to the account token
if (token !=
IntPtr.Zero)
CloseHandle(token);
//close the handle to the duplicated account token
if (tokenDuplicate !=
IntPtr.Zero)
CloseHandle(tokenDuplicate);
}
///
<summary>
/// Ends the current impersonation context.
///
</summary>
public
void EndImpersonationContext()
{
//if the context exists undo it and dispose of the object
if (impersonationContext !=
null)
{
//end the impersonation context and dispose of the object
impersonationContext.Undo();
impersonationContext.Dispose();
}
//mark the impersonation flag false
impersonating = false;
}
#endregion
#region properties
///
<summary>
/// Gets a value indicating whether the impersonation is currently active.
///
</summary>
public
bool Impersonating
{
get
{
return impersonating;
}
}
#endregion
#region IDisposable implementation
~ImpersonationContext()
{
Dispose(false);
}
public
void Dispose()
{
Dispose(true);
}
protected
virtual
void Dispose(bool
disposing)
{
if (disposing)
{
if (impersonationContext !=
null)
{
impersonationContext.Undo();
impersonationContext.Dispose();
}
}
}
#endregion
}
I’m running VS 2012 as different user – with domain user which isn’t in the administrator group
In the code below I impersonate as admin user which has all the access privileges
using (ImpersonationContext
context = new
ImpersonationContext("Admin",
"pass",
"domain"))
{
if (context.Impersonating)
{
string NetworkDrive =
"Q: \\Images\\IMG_8381.JPG";
string localDrive =
"D:\\Images\\767LAN.jpg";
if (File.Exists(NetworkDrive))
{
// never find the file
}
if (File.Exists(localDrive))
{
// find file }
}
}
}
networkDrive always return not Exists
thanks
