我正在使用类似以下方法的方式在我的代码中模拟用户:
How do you do Impersonation in .NET?
在另一个课程中,我需要找出当前用户(例如“mydomain \ moose”),但我不知道我是否正在冒充其他用户。
如果我冒充某人,我该如何获得用户名?
System.Environment.UserName和System.Security.Principal.WindowsIdentity.GetCurrent()。名称都返回原始用户,而不是当前模拟的用户。
更多详情:
我正在进行此模拟,以便我可以访问用户通常无法访问的netowrk共享中的某些文件。
如果我使用登录类型的LOGON32_LOGON_INTERACTIVE,我确实看到了新用户,但我无法访问网络共享。如果我使用登录类型的LOGON32_LOGON_NEW_CREDENTIALS(值为9),我可以访问网络共享,但我在Environment.UserName中看不到新用户。
答案 0 :(得分:20)
开始编辑: 我意识到我第一次尝试回答这个问题并不是很清楚。所以,我想 开始另一次尝试:
首先,我想指出属性WindowsIdentity.GetCurrent().Name
将返回的内容
如果您使用LOGON32_LOGON_NEW_CREDENTIALS
或LOGON32_LOGON_INTERACTIVE
作为LogonUser的登录类型(在模拟类内)函数:
使用LOGON32_LOGON_INTERACTIVE
// Assuming this code runs under USER_B
using (var imp = new Impersonation("treyresearch", "USER_A", "SecurePwd", LOGON32_LOGON_INTERACTIVE ))
{
// Now, we run under USER_A
Console.Out.WriteLine(WindowsIdentity.GetCurrent().Name); // Will return USER_A
}
使用LOGON32_LOGON_NEW_CREDENTIALS
// Assuming this codes runs under USER_B
using (var imp = new Impersonation("treyresearch", "USER_A", "SecurePwd", LOGON32_LOGON_NEW_CREDENTIALS ))
{
Console.Out.WriteLine(WindowsIdentity.GetCurrent().Name); // Will return USER_B
}
这是您在问题中描述的行为,并且与MS LogonUser
函数的说明一致。对于LOGON32_LOGON_NEW_CREDENTIALS
,创建的用户令牌只是当前用户令牌的克隆。这意味着创建的用户会话具有与调用线程相同的标识符。传递给LogonUser
函数的凭据仅用于出站网络连接。
其次,让我指出两种情况:LOGON32_LOGON_INTERACTIVE
和LOGON32_LOGON_NEW_CREDENTIALS
之间的区别变得清晰:
您在computer_A上运行程序(在user_A帐户下)。您模拟user_B(使用LOGON32_LOGON_INTERACTIVE
)。然后连接到computer_B上的网络共享并尝试将文件复制到本地文件夹(只有user_A有权写入此文件夹)。然后,您会收到拒绝访问错误消息,因为文件操作是使用user_B的权限完成的,该权限对本地文件夹没有权限。
与上述情况相同。但现在,我们使用LOGON32_LOGON_NEW_CREDENTIALS
来模拟user_B。我们连接到网络驱动器并将文件从网络驱动器复制到本地文件夹。在这种情况下,操作成功,因为文件操作是使用user_A的权限完成的。
结束编辑
希望,这有帮助。
答案 1 :(得分:5)
根据http://msdn.microsoft.com/en-us/library/chf6fbt4.aspx的示例,当前身份在模仿期间会发生变化。您确定您的代码在模拟代码块中吗?
答案 2 :(得分:2)
我写了一个辅助类来完成它:
public static class ImpersonationUtils
{
private const int SW_SHOW = 5;
private const int TOKEN_QUERY = 0x0008;
private const int TOKEN_DUPLICATE = 0x0002;
private const int TOKEN_ASSIGN_PRIMARY = 0x0001;
private const int STARTF_USESHOWWINDOW = 0x00000001;
private const int STARTF_FORCEONFEEDBACK = 0x00000040;
private const int CREATE_UNICODE_ENVIRONMENT = 0x00000400;
private const int TOKEN_IMPERSONATE = 0x0004;
private const int TOKEN_QUERY_SOURCE = 0x0010;
private const int TOKEN_ADJUST_PRIVILEGES = 0x0020;
private const int TOKEN_ADJUST_GROUPS = 0x0040;
private const int TOKEN_ADJUST_DEFAULT = 0x0080;
private const int TOKEN_ADJUST_SESSIONID = 0x0100;
private const int STANDARD_RIGHTS_REQUIRED = 0x000F0000;
private const int TOKEN_ALL_ACCESS =
STANDARD_RIGHTS_REQUIRED |
TOKEN_ASSIGN_PRIMARY |
TOKEN_DUPLICATE |
TOKEN_IMPERSONATE |
TOKEN_QUERY |
TOKEN_QUERY_SOURCE |
TOKEN_ADJUST_PRIVILEGES |
TOKEN_ADJUST_GROUPS |
TOKEN_ADJUST_DEFAULT |
TOKEN_ADJUST_SESSIONID;
[StructLayout(LayoutKind.Sequential)]
private struct PROCESS_INFORMATION
{
public IntPtr hProcess;
public IntPtr hThread;
public int dwProcessId;
public int dwThreadId;
}
[StructLayout(LayoutKind.Sequential)]
private struct SECURITY_ATTRIBUTES
{
public int nLength;
public IntPtr lpSecurityDescriptor;
public bool bInheritHandle;
}
[StructLayout(LayoutKind.Sequential)]
private struct STARTUPINFO
{
public int cb;
public string lpReserved;
public string lpDesktop;
public string lpTitle;
public int dwX;
public int dwY;
public int dwXSize;
public int dwYSize;
public int dwXCountChars;
public int dwYCountChars;
public int dwFillAttribute;
public int dwFlags;
public short wShowWindow;
public short cbReserved2;
public IntPtr lpReserved2;
public IntPtr hStdInput;
public IntPtr hStdOutput;
public IntPtr hStdError;
}
private enum SECURITY_IMPERSONATION_LEVEL
{
SecurityAnonymous,
SecurityIdentification,
SecurityImpersonation,
SecurityDelegation
}
private enum TOKEN_TYPE
{
TokenPrimary = 1,
TokenImpersonation
}
[DllImport("advapi32.dll", SetLastError = true)]
private static extern bool CreateProcessAsUser(
IntPtr hToken,
string lpApplicationName,
string lpCommandLine,
ref SECURITY_ATTRIBUTES lpProcessAttributes,
ref SECURITY_ATTRIBUTES lpThreadAttributes,
bool bInheritHandles,
int dwCreationFlags,
IntPtr lpEnvironment,
string lpCurrentDirectory,
ref STARTUPINFO lpStartupInfo,
out PROCESS_INFORMATION lpProcessInformation);
[DllImport("advapi32.dll", SetLastError = true)]
private static extern bool DuplicateTokenEx(
IntPtr hExistingToken,
int dwDesiredAccess,
ref SECURITY_ATTRIBUTES lpThreadAttributes,
int ImpersonationLevel,
int dwTokenType,
ref IntPtr phNewToken);
[DllImport("advapi32.dll", SetLastError = true)]
private static extern bool OpenProcessToken(
IntPtr ProcessHandle,
int DesiredAccess,
ref IntPtr TokenHandle);
[DllImport("userenv.dll", SetLastError = true)]
private static extern bool CreateEnvironmentBlock(
ref IntPtr lpEnvironment,
IntPtr hToken,
bool bInherit);
[DllImport("userenv.dll", SetLastError = true)]
private static extern bool DestroyEnvironmentBlock(
IntPtr lpEnvironment);
[DllImport("kernel32.dll", SetLastError = true)]
private static extern bool CloseHandle(
IntPtr hObject);
private static void LaunchProcessAsUser(string cmdLine, IntPtr token, IntPtr envBlock, int sessionId)
{
var pi = new PROCESS_INFORMATION();
var saProcess = new SECURITY_ATTRIBUTES();
var saThread = new SECURITY_ATTRIBUTES();
saProcess.nLength = Marshal.SizeOf(saProcess);
saThread.nLength = Marshal.SizeOf(saThread);
var si = new STARTUPINFO();
si.cb = Marshal.SizeOf(si);
si.lpDesktop = @"WinSta0\Default";
si.dwFlags = STARTF_USESHOWWINDOW | STARTF_FORCEONFEEDBACK;
si.wShowWindow = SW_SHOW;
if (!CreateProcessAsUser(
token,
null,
cmdLine,
ref saProcess,
ref saThread,
false,
CREATE_UNICODE_ENVIRONMENT,
envBlock,
null,
ref si,
out pi))
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "CreateProcessAsUser failed");
}
}
private static IDisposable Impersonate(IntPtr token)
{
var identity = new WindowsIdentity(token);
return identity.Impersonate();
}
private static IntPtr GetPrimaryToken(Process process)
{
var token = IntPtr.Zero;
var primaryToken = IntPtr.Zero;
if (OpenProcessToken(process.Handle, TOKEN_DUPLICATE, ref token))
{
var sa = new SECURITY_ATTRIBUTES();
sa.nLength = Marshal.SizeOf(sa);
if (!DuplicateTokenEx(
token,
TOKEN_ALL_ACCESS,
ref sa,
(int)SECURITY_IMPERSONATION_LEVEL.SecurityImpersonation,
(int)TOKEN_TYPE.TokenPrimary,
ref primaryToken))
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "DuplicateTokenEx failed");
}
CloseHandle(token);
}
else
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "OpenProcessToken failed");
}
return primaryToken;
}
private static IntPtr GetEnvironmentBlock(IntPtr token)
{
var envBlock = IntPtr.Zero;
if (!CreateEnvironmentBlock(ref envBlock, token, false))
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "CreateEnvironmentBlock failed");
}
return envBlock;
}
public static void LaunchAsCurrentUser(string cmdLine)
{
var process = Process.GetProcessesByName("explorer").FirstOrDefault();
if (process != null)
{
var token = GetPrimaryToken(process);
if (token != IntPtr.Zero)
{
var envBlock = GetEnvironmentBlock(token);
if (envBlock != IntPtr.Zero)
{
LaunchProcessAsUser(cmdLine, token, envBlock, process.SessionId);
if (!DestroyEnvironmentBlock(envBlock))
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "DestroyEnvironmentBlock failed");
}
}
CloseHandle(token);
}
}
}
public static IDisposable ImpersonateCurrentUser()
{
var process = Process.GetProcessesByName("explorer").FirstOrDefault();
if (process != null)
{
var token = GetPrimaryToken(process);
if (token != IntPtr.Zero)
{
return Impersonate(token);
}
}
throw new Exception("Could not find explorer.exe");
}
}
你可以这样使用它:
ImpersonationUtils.LaunchAsCurrentUser("notepad");
using (ImpersonationUtils.ImpersonateCurrentUser())
{
}
您可以在此处找到更多解释和示例:
答案 3 :(得分:1)