使用Win32 API模拟访问网络共享与使用Windows资源管理器读取网络共享?

时间:2011-10-17 18:22:18

标签: asp.net login impersonation file-sharing network-share

我有一个使用Win32 API模拟的Web应用程序。我最近从一次旅行回来,找到了冒充失败的应用程序部分。

模仿的原因是存在用于特定目的的网络共享。当我的Web应用程序访问该网络共享时,它必须模拟一个特殊帐户。为了便于讨论,uid是“Bob”,密码是“1234”,域名是“home”。

两周前,我编写了我的程序,使用Win32 API来模仿Bob,一切都很顺利。现在,Win32 API指示登录失败。我无法弄清楚可能会发生什么变化。 具体而言,服务器指示它无法模仿Bob。在服务器实际尝试访问网络共享之前发生错误。

奇怪的是,如果我使用MSTSC连接到我的Web服务器,我可以在Windows资源管理器中单击“映射网络驱动器”并使用Bob @ home和密码1234访问这些文件。(我输入通过单击“映射网络驱动器”对话框中的“使用其他用户名连接”来获取uid和密码

当我尝试通过模拟访问我的网络共享而不是使用Windows资源管理器时,似乎必须发生一些不同的事情。

有什么区别?

更新:我觉得这个问题的答案是,当我通过Windows资源管理器访问我的文件时,存在某种被拒绝的登录权限,而这种权限在某种程度上没有涉及。

1 个答案:

答案 0 :(得分:2)

确保您使用UNC路径访问该文件夹:

string path = @"\\server\folder";

我不知道你的模拟课是什么样的,但这是我用于类似任务的课程:

/// <summary> 
/// Leverages the Windows API (advapi32.dll) to programmatically impersonate a user. 
/// </summary> 
public class ImpersonationContext : IDisposable 
{ 
    #region constants 

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

    #endregion 

    #region global variables 

    private WindowsImpersonationContext impersonationContext; 
    private bool impersonating; 

    #endregion 

    #region unmanaged code 

    [DllImport("advapi32.dll")] 
    private 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)] 
    private static extern 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 static extern bool CloseHandle(IntPtr handle); 

    #endregion 

    #region constructors 

    public ImpersonationContext() 
    { 
        impersonating = false; 
    } 

    /// <summary> 
    /// Overloaded constructor and begins impersonating. 
    /// </summary> 
    public ImpersonationContext(string userName, string password, string domain) 
    { 
        this.BeginImpersonationContext(userName, password, domain); 
    } 

    #endregion 

    #region impersonation methods 

    /// <summary> 
    /// Begins the impersonation context for the specified user. 
    /// </summary> 
    /// <remarks>Don't call this method if you used the overloaded constructor.</remarks> 
    public void BeginImpersonationContext(string userName, string password, string domain) 
    { 
        //initialize token and duplicate variables 
        IntPtr token = IntPtr.Zero; 
        IntPtr tokenDuplicate = IntPtr.Zero; 

        if (RevertToSelf()) 
        { 
            if (LogonUserA(userName, domain, password, LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, ref token) != 0) 
            { 
                if (DuplicateToken(token, 2, ref tokenDuplicate) != 0) 
                { 
                    using (WindowsIdentity tempWindowsIdentity = new WindowsIdentity(tokenDuplicate)) 
                    { 
                        //begin the impersonation context and mark impersonating true 
                        impersonationContext = tempWindowsIdentity.Impersonate(); 
                        impersonating = true; 
                    } 
                } 
            } 
        } 

        //close the handle to the account token 
        if (token != IntPtr.Zero) 
            CloseHandle(token); 

        //close the handle to the duplicated account token 
        if (tokenDuplicate != IntPtr.Zero) 
            CloseHandle(tokenDuplicate); 
    } 

    /// <summary> 
    /// Ends the current impersonation context. 
    /// </summary> 
    public void EndImpersonationContext() 
    { 
        //if the context exists undo it and dispose of the object 
        if (impersonationContext != null) 
        { 
            //end the impersonation context and dispose of the object 
            impersonationContext.Undo(); 
            impersonationContext.Dispose(); 
        } 

        //mark the impersonation flag false 
        impersonating = false; 
    } 

    #endregion 

    #region properties 

    /// <summary> 
    /// Gets a value indicating whether the impersonation is currently active. 
    /// </summary> 
    public bool Impersonating 
    { 
        get 
        { 
            return impersonating; 
        } 
    } 

    #endregion 

    #region IDisposable implementation 

    ~ImpersonationContext() 
    { 
        Dispose(false); 
    } 

    public void Dispose() 
    { 
        Dispose(true);                
    } 

    protected virtual void Dispose(bool disposing) 
    { 
        if (disposing) 
        { 
            if (impersonationContext != null) 
            { 
                impersonationContext.Undo(); 
                impersonationContext.Dispose(); 
            } 
        } 
    } 

    #endregion     
} 

使用ImpersonationContext

using (ImpersonationContext context = new ImpersonationContext("user", "password", "domain")) 
{ 
    if (context.Impersonating) 
    { 
        Process.Start(@"/Support/SendFax/SendFax.exe"); 
    } 
}