【转载】C#中局域网共享目录的访问

}

}

}

MSDN：

http://msdn2.microsoft.com/zh-cn/library/system.security.principal.windowsimpersonationcontext_members(VS.80).aspx

http://msdn2.microsoft.com/en-us/library/system.security.principal.windowsimpersonationcontext(vs.71).aspx

Net Use方案

public string ConnectLan()

{

Process p;

p=new Process();

p.StartInfo.FileName="cmd.exe";

// 这里是关键点,不用Shell启动/重定向输入/重定向输出/不显示窗口

p.StartInfo.UseShellExecute = false;

p.StartInfo.RedirectStandardInput = true;

p.StartInfo.RedirectStandardOutput = true;

p.StartInfo.CreateNoWindow = true;

p.Start();

p.StandardInput.WriteLine("net use """"Nt02 密码 /user:用户名");// 向cmd.exe输入command

p.StandardInput.WriteLine("exit");

p.WaitForExit();

string s = p.StandardOutput.ReadToEnd();// 得到cmd.exe的输出

p.Close();

return s;

}

WindowsImpersonationContext方案

[C#]

// This sample demonstrates the use of the WindowsIdentity class to impersonate a user.

// IMPORTANT NOTES:

// This sample can be run only on Windows XP. The default Windows 2000 security policy

// prevents this sample from executing properly, and changing the policy to allow

// proper execution presents a security risk.

// This sample requests the user to enter a password on the console screen.

// Because the console window does not support methods allowing the password to be masked,

// it will be visible to anyone viewing the screen.

using System;

using System.Runtime.InteropServices;

using System.Security.Principal;

using System.Security.Permissions;

[assembly:SecurityPermissionAttribute(SecurityAction.RequestMinimum, UnmanagedCode=true)]

[assembly:PermissionSetAttribute(SecurityAction.RequestMinimum, Name = "FullTrust")]

public class ImpersonationDemo

{

[DllImport("advapi32.dll", SetLastError=true)]

public static extern bool LogonUser(String lpszUsername, String lpszDomain, String lpszPassword,

int dwLogonType, int dwLogonProvider, ref IntPtr phToken);

[DllImport("kernel32.dll", CharSet=System.Runtime.InteropServices.CharSet.Auto)]

private unsafe static extern int FormatMessage(int dwFlags, ref IntPtr lpSource,

int dwMessageId, int dwLanguageId, ref String lpBuffer, int nSize, IntPtr *Arguments);

[DllImport("kernel32.dll", CharSet=CharSet.Auto)]

public extern static bool CloseHandle(IntPtr handle);

[DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)]

public extern static bool DuplicateToken(IntPtr ExistingTokenHandle,

int SECURITY_IMPERSONATION_LEVEL, ref IntPtr DuplicateTokenHandle);

// GetErrorMessage formats and returns an error message

// corresponding to the input errorCode.

public unsafe static string GetErrorMessage(int errorCode)

{

int FORMAT_MESSAGE_ALLOCATE_BUFFER = 0x00000100;

int FORMAT_MESSAGE_IGNORE_INSERTS = 0x00000200;

int FORMAT_MESSAGE_FROM_SYSTEM = 0x00001000;

//int errorCode = 0x5; //ERROR_ACCESS_DENIED

//throw new System.ComponentModel.Win32Exception(errorCode);

int messageSize = 255;

String lpMsgBuf = "";

int dwFlags = FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS;

IntPtr ptrlpSource = IntPtr.Zero;

IntPtr prtArguments = IntPtr.Zero;

int retVal = FormatMessage(dwFlags, ref ptrlpSource, errorCode, 0, ref lpMsgBuf, messageSize, &prtArguments);

if (0 == retVal)

{

throw new Exception("Failed to format message for error code " + errorCode + ". ");

}

return lpMsgBuf;

}

// Test harness.

// If you incorporate this code into a DLL, be sure to demand FullTrust.

[PermissionSetAttribute(SecurityAction.Demand, Name = "FullTrust")]

public static void Main(string[] args)

{

IntPtr tokenHandle = new IntPtr(0);

IntPtr dupeTokenHandle = new IntPtr(0);

try

{

string userName, domainName;

// Get the user token for the specified user, domain, and password using the

// unmanaged LogonUser method.

// The local machine name can be used for the domain name to impersonate a user on this machine.

Console.Write("Enter the name of the domain on which to log on: ");

domainName = Console.ReadLine();

Console.Write("Enter the login of a user on {0} that you wish to impersonate: ", domainName);

userName = Console.ReadLine();

Console.Write("Enter the password for {0}: ", userName);

const int LOGON32_PROVIDER_DEFAULT = 0;

//This parameter causes LogonUser to create a primary token.

const int LOGON32_LOGON_INTERACTIVE = 2;

const int SecurityImpersonation = 2;

tokenHandle = IntPtr.Zero;

dupeTokenHandle = IntPtr.Zero;

// Call LogonUser to obtain a handle to an access token.

bool returnValue = LogonUser(userName, domainName, Console.ReadLine(),

LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT,

ref tokenHandle);

Console.WriteLine("LogonUser called.");

if (false == returnValue)

{

int ret = Marshal.GetLastWin32Error();

Console.WriteLine("LogonUser failed with error code : {0}", ret);

Console.WriteLine(""nError: [{0}] {1}"n", ret, GetErrorMessage(ret));

int errorCode = 0x5; //ERROR_ACCESS_DENIED

throw new System.ComponentModel.Win32Exception(errorCode);

}

Console.WriteLine("Did LogonUser Succeed? " + (returnValue? "Yes" : "No"));

Console.WriteLine("Value of Windows NT token: " + tokenHandle);

// Check the identity.

Console.WriteLine("Before impersonation: "

+ WindowsIdentity.GetCurrent().Name);

bool retVal = DuplicateToken(tokenHandle, SecurityImpersonation, ref dupeTokenHandle);

if (false == retVal)

{

CloseHandle(tokenHandle);

Console.WriteLine("Exception thrown in trying to duplicate token.");

return;

}

// The token that is passed to the following constructor must

// be a primary token in order to use it for impersonation.

WindowsIdentity newId = new WindowsIdentity(dupeTokenHandle);

WindowsImpersonationContext impersonatedUser = newId.Impersonate();

// Check the identity.

Console.WriteLine("After impersonation: "

+ WindowsIdentity.GetCurrent().Name);

// Stop impersonating the user.

impersonatedUser.Undo();

// Check the identity.

Console.WriteLine("After Undo: " + WindowsIdentity.GetCurrent().Name);

// Free the tokens.

if (tokenHandle != IntPtr.Zero)

CloseHandle(tokenHandle);

if (dupeTokenHandle != IntPtr.Zero)

CloseHandle(dupeTokenHandle);

}

catch(Exception ex)

{

Console.WriteLine("Exception occurred. " + ex.Message);

}

}

}

MSDN：

http://msdn2.microsoft.com/zh-cn/library/system.security.principal.windowsimpersonationcontext_members(VS.80).aspx

http://msdn2.microsoft.com/en-us/library/system.security.principal.windowsimpersonationcontext(vs.71).aspx