.net下模拟不同身份登陆以获取不同权限

.net下模拟不同身份登陆以获取不同权限  
 
作者:佚名 时间:-- : 出处:互连网 责编:chinaitpower  
 
              摘要：.net下模拟不同身份登陆以获取不同权限 
 
 
不管是asp.net、web service还是window service，程序运行的时候只有本地计算机的部分权限，有时候需要更大的权限，比如读写某台服务器或域中的一台计算机上的文件等，这就需要更大的权限，比如域帐户权限。 

通过获取不同身份的WindowsImpersonationContext对象，可以模拟不同用户登陆，请看我生成的NetworkSecurity类的 
public static WindowsImpersonationContext ImpersonateUser(string strDomain, 
string strLogin, 

string strPwd, 

LogonType logonType, 

LogonProvider logonProvider)； 

附NetworkSecurity.cs源代码如下： 

/* 
* Author : TongWei 
* Date : 2005-1-25 
* Rights : China Netwave Inc.@2005 
*/ 

using System; 
using System.Runtime.InteropServices; 
using System.Security.Principal; 
using System.Security.Permissions; 

namespace CNW.OMP.Common.Utility 
{ 
public enum LogonType : int 
{ 
/// <summary> 
/// This logon type is intended for users who will be interactively using the computer, such as a user 
/// being logged on by a terminal server, remote shell, or similar process. This logon type has the 
/// additional expense of caching logon information for disconnected operation, and is therefore 
/// inappropriate for some client/server applications, such as a mail server. 
/// </summary> 
LOGON32_LOGON_INTERACTIVE = , 

/// <summary> 
/// This logon type is intended for high performance servers to authenticate clear text passwords. 
/// The LogonUser function does not cache credentials for this logon type. 
/// </summary> 
LOGON32_LOGON_NETWORK = , 

/// <summary> 
/// This logon type is intended for batch servers, where processes may be executing on behalf of a user 
/// without their direct intervention; or for higher performance servers that process many clear-text 
/// authentication attempts at a time, such as mail or web servers. The LogonUser function does not cache 
/// credentials for this logon type. 
/// </summary> 
LOGON32_LOGON_BATCH = , 

/// <summary> 
/// Indicates a service-type logon. The account provided must have the service privilege enabled. 
/// </summary> 
LOGON32_LOGON_SERVICE = , 

/// <summary> 
/// This logon type is intended for GINA DLLs logging on users who will be interactively using the computer. 
/// This logon type allows a unique audit record to be generated that shows when the workstation was unlocked. 
/// </summary> 
LOGON32_LOGON_UNLOCK = , 

/// <summary> 
/// Windows XP/2000: This logon type preserves the name and password in the authentication packages, 
/// allowing the server to make connections to other network servers while impersonating the client. 
/// This allows a server to accept clear text credentials from a client, call LogonUser, verify that 
/// the user can access the system across the network, and still communicate with other servers. 
/// </summary> 
LOGON32_LOGON_NETWORK_CLEARTEXT = , 

/// <summary> 
/// Windows XP/2000: This logon type allows the caller to clone its current token and specify new credentials 
/// for outbound connections. The new logon session has the same local identity, but uses different credentials 
/// for other network connections. 
/// This logon type is supported only by the LOGON32_PROVIDER_WINNT50 logon provider. 
/// </summary> 
LOGON32_LOGON_NEW_CREDENTIALS =  
}; 

public enum LogonProvider : int 
{ 
/// <summary> 
/// Use the standard logon provider for the system. The default security provider is NTLM. 
/// Windows XP: The default provider is negotiate, unless you pass NULL for the domain name and 
/// the user name is not in UPN format. In this case the default provider is NTLM. 
/// </summary> 
LOGON32_PROVIDER_DEFAULT = , 

/// <summary> 
/// Use the Windows NT 3.5 logon provider. 
/// </summary> 
LOGON32_PROVIDER_WINNT35 = , 

/// <summary> 
/// Use the NTLM logon provider. 
/// </summary> 
LOGON32_PROVIDER_WINNT40 = , 

/// <summary> 
/// Windows XP/2000: Use the negotiate logon provider. 
/// </summary> 
LOGON32_PROVIDER_WINNT50 =  
}; 

class SecuUtil32 
{ 
[DllImport("advapi32.dll", SetLastError=true)] 
public static extern bool LogonUser(String lpszUsername, String lpszDomain, String lpszPassword, 
int dwLogonType, int dwLogonProvider, ref IntPtr TokenHandle); 

[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); 
} 

public class NetworkSecurity 
{ 
public NetworkSecurity() 
{ 
// 
// TODO: Add constructor logic here 
// 
} 

/// <summary> 
/// The ImpersonateUser function attempts to log a user on to the local computer. 
/// The local computer is the computer from which ImpersonateUser was called. 
/// You cannot use ImpersonateUser to log on to a remote computer. 
/// You specify the user with a user name and domain, and authenticate the user with a clear-text password. 
/// If the function succeeds, you receive a handle to a token that represents the logged-on user. 
/// You can then use this token handle to impersonate the specified user, or in most cases, 
/// to create a process running in the context of the specified user. 
/// </summary> 
/// <param name="strDomain"> 
/// specifies the name of the domain or server whose account database contains the strLogin account. 
/// </param> 
/// <param name="strLogin">specifies the name of the user.</param> 
/// <param name="strPwd">specifies the clear-text password for the user account specified by strLogin.</param> 
/// <param name="logonType">Specifies the type of logon operation to perform.</param> 
/// <param name="logonProvider">Specifies the logon provider.</param> 
/// <example> 
/// //Add System.Security.dll 
/// //using System.Security.Principal; 
/// 
/// string strDomain=ConfigurationSettings.AppSettings["mSALoginDomainName"]; 
/// string strUser=ConfigurationSettings.AppSettings["mSALoginDomainUser"]; 
/// string strPassword=ConfigurationSettings.AppSettings["mSALoginDomainPassword"]; 
/// 
/// WindowsImpersonationContext impContext = null; 
/// try 
/// { 
/// impContext = NetworkSecurity.ImpersonateUser(strDomain,strUser,strPassword, 
/// LogonType.LOGON32_LOGON_SERVICE, 
/// LogonProvider.LOGON32_PROVIDER_DEFAULT); 
/// } 
/// catch 
/// { 
/// 
/// } 
/// 
/// //work under this logined user 
/// 
/// impContext.Undo(); 
/// </example> 
/// <returns> 
/// </returns> 
public static WindowsImpersonationContext ImpersonateUser(string strDomain, 
string strLogin, 
string strPwd, 
LogonType logonType, 
LogonProvider logonProvider) 
{ 
// Initialize tokens 
IntPtr tokenHandle = new IntPtr(); 
IntPtr dupeTokenHandle = new IntPtr(); 
tokenHandle = IntPtr.Zero; 
dupeTokenHandle = IntPtr.Zero; 

// If domain name was blank, assume local machine 
if (strDomain == "") 
strDomain = System.Environment.MachineName; 

try 
{ 
const int SecurityImpersonation = ; 

// Call LogonUser to obtain a handle to an access token. 
bool returnValue = SecuUtil32.LogonUser( 
strLogin, 
strDomain, 
strPwd, 
(int)logonType, 
(int)logonProvider, 
ref tokenHandle); 

// Did impersonation fail? 
if (false == returnValue) 
{ 
int ret = Marshal.GetLastWin32Error(); 
// Throw the exception show the reason why LogonUser failed 
string strErr = String.Format("LogonUser failed with error code : {0}", ret); 
throw new ApplicationException(strErr, null); 
} 

// Get identity before impersonation 
bool retVal = SecuUtil32.DuplicateToken(tokenHandle, SecurityImpersonation, ref dupeTokenHandle); 

// Did DuplicateToken fail? 
if (false == retVal) 
{ 
// Close existing handle 
SecuUtil32.CloseHandle(tokenHandle); 
// Throw the exception show the reason why DuplicateToken failed 
throw new ApplicationException("Failed to duplicate token", null); 
} 

// Create new identity using new primary token 
// 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(); 

return impersonatedUser; 
} 
catch (Exception ex) 
{ 
throw new ApplicationException(ex.Message, ex); 
} 
finally 
{ 
// Close handle 
if (tokenHandle != IntPtr.Zero) 
SecuUtil32.CloseHandle(tokenHandle); 
if (dupeTokenHandle != IntPtr.Zero) 
SecuUtil32.CloseHandle(dupeTokenHandle); 
} 
} 
} 
}

<%@ Page Language="C#"%>
<%@ Import Namespace = "System.Web" %>
<%@ Import Namespace = "System.Web.Security" %>
<%@ Import Namespace = "System.Security.Principal" %>
<%@ Import Namespace = "System.Runtime.InteropServices" %>

<script runat=server>
public const int LOGON32_LOGON_INTERACTIVE = ;
public const int LOGON32_PROVIDER_DEFAULT = ;

WindowsImpersonationContext impersonationContext;

[DllImport("advapi32.dll")]
public 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)]
public static extern int DuplicateToken(IntPtr hToken,
    int impersonationLevel,
    ref IntPtr hNewToken);

[DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)]
public static extern bool RevertToSelf();

[DllImport("kernel32.dll", CharSet=CharSet.Auto)]
public static extern  bool CloseHandle(IntPtr handle);

public void Page_Load(Object s, EventArgs e)
{
    if(impersonateValidUser("username", "domain", "password"))
    {
        //Insert your code that runs under the security context of a specific user here.
        undoImpersonation();
    }
    else
    {
        //Your impersonation failed. Therefore, include a fail-safe mechanism here.
    }
}

private bool impersonateValidUser(String userName, String domain, String password)
{
    WindowsIdentity tempWindowsIdentity;
    IntPtr token = IntPtr.Zero;
    IntPtr tokenDuplicate = IntPtr.Zero;

    if(RevertToSelf())
    {
        if(LogonUserA(userName, domain, password, LOGON32_LOGON_INTERACTIVE,
            LOGON32_PROVIDER_DEFAULT, ref token) != )
        {
            if(DuplicateToken(token, , ref tokenDuplicate) != )
            {
                tempWindowsIdentity = new WindowsIdentity(tokenDuplicate);
                impersonationContext = tempWindowsIdentity.Impersonate();
                if (impersonationContext != null)
                {
                    CloseHandle(token);
                    CloseHandle(tokenDuplicate);
                    return true;
                }
            }
        }
    }
    if(token!= IntPtr.Zero)
        CloseHandle(token);
    if(tokenDuplicate!=IntPtr.Zero)
        CloseHandle(tokenDuplicate);
    return false;
}

private void undoImpersonation()
{
    impersonationContext.Undo();
}
</script>