internal class TokenAdjuster { [DllImport("user32.dll")] internal static extern bool ExitWindowsEx(int uFlags,int dwReserved); // PInvoke stuff required to set/enable security privileges [DllImport("advapi32", SetLastError=true)] [SuppressUnmanagedCodeSecurity] static extern int OpenProcessToken( IntPtr ProcessHandle, // handle to process int DesiredAccess, // desired access to process ref IntPtr TokenHandle // handle to open access token ); [DllImport("kernel32", SetLastError=true)] [SuppressUnmanagedCodeSecurity] static extern bool CloseHandle(IntPtr handle); [DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)] [SuppressUnmanagedCodeSecurity] static extern int AdjustTokenPrivileges( IntPtr TokenHandle, int DisableAllPrivileges, IntPtr NewState, int BufferLength, IntPtr PreviousState, ref int ReturnLength); [DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)] [SuppressUnmanagedCodeSecurity] static extern bool LookupPrivilegeValue( string lpSystemName, string lpName, ref LUID lpLuid); [StructLayout(LayoutKind.Sequential)] internal struct LUID { internal int LowPart; internal int HighPart; } [StructLayout(LayoutKind.Sequential)] internal struct LUID_AND_ATTRIBUTES { LUID Luid; int Attributes; } [StructLayout(LayoutKind.Sequential)] internal struct _PRIVILEGE_SET { int PrivilegeCount; int Control; [MarshalAs(UnmanagedType.ByValArray, SizeConst=1)] // ANYSIZE_ARRAY = 1 LUID_AND_ATTRIBUTES [] Privileges; } [StructLayout(LayoutKind.Sequential)] internal struct TOKEN_PRIVILEGES { internal int PrivilegeCount; [MarshalAs(UnmanagedType.ByValArray, SizeConst=3)] internal int[] Privileges; } const int SE_PRIVILEGE_ENABLED = 0x00000002; const int TOKEN_ADJUST_PRIVILEGES = 0X00000020; const int TOKEN_QUERY = 0X00000008; const int TOKEN_ALL_ACCESS = 0X001f01ff; const int PROCESS_QUERY_INFORMATION = 0X00000400; public static bool SetPrivilege (string privilege, bool enablePrivilege) { bool retval = false; int ltkpOld = 0; IntPtr hToken = IntPtr.Zero; TOKEN_PRIVILEGES tkp = new TOKEN_PRIVILEGES(); tkp.Privileges = new int[3]; TOKEN_PRIVILEGES tkpOld = new TOKEN_PRIVILEGES(); tkpOld.Privileges = new int[3]; LUID tLUID = new LUID(); tkp.PrivilegeCount = 1; if (enablePrivilege) tkp.Privileges[2] = SE_PRIVILEGE_ENABLED; else tkp.Privileges[2] = 0; if(LookupPrivilegeValue(null , privilege , ref tLUID)) { Process proc = Process.GetCurrentProcess(); if(proc.Handle != IntPtr.Zero) { if (OpenProcessToken(proc.Handle, TOKEN_ADJUST_PRIVILEGES|TOKEN_QUERY,ref hToken) != 0) { tkp.PrivilegeCount = 1; tkp.Privileges[2] = SE_PRIVILEGE_ENABLED; tkp.Privileges[1] = tLUID.HighPart; tkp.Privileges[0] = tLUID.LowPart; const int bufLength = 256; IntPtr tu = Marshal.AllocHGlobal( bufLength ); Marshal.StructureToPtr(tkp, tu, true); if(AdjustTokenPrivileges(hToken, 0, tu, bufLength, IntPtr.Zero, ref ltkpOld) != 0) { // successful AdjustTokenPrivileges doesn't mean privilege could be changed int iError = Marshal.GetLastWin32Error(); if (iError == 0) { retval = true; // Token changed } else { throw new ApplicationException(iError.ToString()); } } TOKEN_PRIVILEGES tokp = (TOKEN_PRIVILEGES) Marshal.PtrToStructure(tu, typeof(TOKEN_PRIVILEGES) ); Marshal.FreeHGlobal( tu ); } } } if (hToken != IntPtr.Zero) { CloseHandle(hToken); } return retval; } }

先写了个Command Line App 作试验，很顺利的搞定了,但是同样的代码改写成Web Service以后, 调用 ExitWindowsEx 却没有反应--跟踪检查了一下，AdjustTokenPrivileges 似乎也沒有返回错误.不放心在后面加了个 GetLastError,拿到一个1300错误--Not all privileges referenced are assigned to the caller. 看来是运行进程的User权限不够....试着把machine.config 里的processModel/@user 从machine 改成SYSTEM, 一切就OK了。不过如果我不这么改，而是试着给ASPNET这个User加权限，似乎好像还是有问题--我甚至在Local Policy里把 Act as a part of OS都给了ASPNET，更不用说加入Local Admin组了。不知道成功设置这个Privilege到底需要什么样的权限。

 BTW: 写完这个以后，倒是想到跳过AdjustTokenPrivileges Restart 机器的一个办法：简单的写一Windows Service，想重起的时候，想办法要这Service 抛出1错误，只要在Service 配置的Recover页里做一点小小的设置，就可以重起了。 想法来源于以前的那个会搞s RPC服务的病毒，没有试验过，不过相信基本上没有什么大问题。

      最后，恭喜开心同学结婚成功，今后天天有番茄炒蛋
吃。haha