using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Principal;
using System.Runtime.InteropServices;

public class Impersonate
{
#region 模拟
private WindowsImpersonationContext impersonationContext;

private const int LOGON32_LOGON_INTERACTIVE = 2;
private const int LOGON32_PROVIDER_DEFAULT = 0;

[DllImport("advapi32.dll", CharSet = CharSet.Auto)]
private static extern int LogonUser(String lpszUserName, String lpszDomain, String lpszPassword,
int dwLogonType, int dwLogonProvider, ref IntPtr phToken);

[DllImport("advapi32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto, SetLastError = true)]
private extern static 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 extern static bool CloseHandle(IntPtr handle);

///

/// 模拟一个用户
///

/// 用户名
/// 密码
/// 域名/计算机名
/// true 模拟成功，false 模拟失败
public bool ImpersonateUser(string userName, string password, string domain)
{
WindowsIdentity wi;
IntPtr token = IntPtr.Zero;
IntPtr tokenDuplicate = IntPtr.Zero;
if (RevertToSelf())
{
if (LogonUser(userName, domain, password,
LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, ref token) != 0)
{
if (DuplicateToken(token, 2, ref tokenDuplicate) != 0)
{
wi = new WindowsIdentity(tokenDuplicate);
impersonationContext = wi.Impersonate();
if (impersonationContext != null)
{
CloseHandle(tokenDuplicate);
CloseHandle(token);
return true;
}
else
{
if (tokenDuplicate != IntPtr.Zero) CloseHandle(tokenDuplicate);
if (token != IntPtr.Zero) CloseHandle(token);
return false;
}
}
else
{
if (token != IntPtr.Zero) CloseHandle(token);
return false;
}
}
else
return false;
}
else
return false;
}

///

/// 取消模拟
///

public void UndoImpersonation()
{
impersonationContext.Undo();
}
#endregion

#region 关机
[StructLayout(LayoutKind.Sequential, Pack = 1)]
private struct TokPriv1Luid
{
public int Count;
public long Luid;
public int Attr;
}

[DllImport("kernel32.dll", ExactSpelling = true)]
private static extern IntPtr GetCurrentThread();

[DllImport("advapi32.dll", ExactSpelling = true, SetLastError = true)]
private static extern bool OpenThreadToken(IntPtr h, int acc, bool openAsSelf, ref IntPtr phtok);

[DllImport("advapi32.dll", SetLastError = true)]
private static extern bool LookupPrivilegeValue(string host, string name, ref long pluid);

[DllImport("advapi32.dll", ExactSpelling = true, SetLastError = true)]
private static extern bool AdjustTokenPrivileges(IntPtr htok, bool disall, ref TokPriv1Luid newst,
int len, IntPtr prev, IntPtr relen);

[DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
private static extern bool ExitWindowsEx(int flg, int rea);

[DllImport("advapi32.dll")]
private static extern bool InitiateSystemShutdown(string Machinename, string Message,
long Timeout, bool ForceAppsClosed, bool RebootAfterShutdown);

private const int SE_PRIVILEGE_ENABLED = 0x00000002;
private const int TOKEN_QUERY = 0x00000008;
private const int TOKEN_ADJUST_PRIVILEGES = 0x00000020;
private const string SE_SHUTDOWN_NAME = "SeShutdownPrivilege";
private const int EWX_LOGOFF = 0x00000000;
private const int EWX_SHUTDOWN = 0x00000001;
private const int EWX_REBOOT = 0x00000002;
private const int EWX_FORCE = 0x00000004;
private const int EWX_POWEROFF = 0x00000008;
private const int EWX_FORCEIFHUNG = 0x00000010;

///

/// 关机
///

///
public bool ShutDown()
{
bool result;
TokPriv1Luid tp;
//注意:这里用的是GetCurrentThread,而不是GetCurrentProcess
IntPtr hproc = GetCurrentThread();
IntPtr htok = IntPtr.Zero;
//注意:这里用的是OpenThreadToken(打开线程令牌),而不是OpenProcessToken(打开进程令牌)
result = OpenThreadToken(hproc, TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY,
true, ref htok);
tp.Count = 1;
tp.Luid = 0;
tp.Attr = SE_PRIVILEGE_ENABLED;
result = LookupPrivilegeValue(null, SE_SHUTDOWN_NAME, ref tp.Luid);
result = AdjustTokenPrivileges(htok, false, ref tp, 0, IntPtr.Zero, IntPtr.Zero);
result = InitiateSystemShutdown("", "", 60, true, false);
return result;
}
#endregion
}