模拟代码中的UAC设置密码

时间:2013-05-20 20:14:23

标签: c# uac impersonation

是否可以通过Vista/Windows 7在代码中设置用户名,登录名和密码来模拟管理员?

我的方案:很多用户(没有本地管理员资格)会执行C#程序; C#程序将文件复制到C:\Windows\。我希望程序使用管理员的凭据来执行复制,而不会收到“拒绝访问”消息,也不需要在UAC提示符下键入凭据。

我尝试过这两种方法:

  • 包含requireAdministratorhighestAvailable的清单。系统将提示用户输入凭据,因此不起作用。
  • 使用LogonUser中的旧advapi32.dll API模拟。我已经完成了它并且像魅力一样......但仅限于Windows XP。

这可能吗?

修改

很感兴趣我为什么要做这么可怕的事情。我正在编辑以包含一些我的评论,解释为什么我需要这个。

  

我们无法在每台用户计算机中创建计划任务。这是一个   时间:向所有用户发送电子邮件,要求他们执行.exe   文件在网络文件夹中(或附加.exe)。这就是整体   要点:避免用电脑做电脑。

     

加油吧!我知道这不是严格的,但那是场景。该   正常和正确的方式将需要我们2个月的公司   程序。总经理要求我们找到一种方法来做到这一点   一周因商业原因。这不是关于某些病毒或攻击......   这是一个愚蠢的任务,用一个更改过时的壁纸   与新的销售“口头禅”。

2 个答案:

答案 0 :(得分:3)

你说你只是在改变用户的壁纸,正确的方法是两个步骤,可以完全用组策略完成。

第1步: 有一个one time per-machine startup script将背景从网络共享复制到本地Windows目录。

第2步Update the users wallpaper到新的企业壁纸。 (您需要更新的注册码位于HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\,具体为WallpaperWallpaperStyle

如果新壁纸的名称与旧壁纸的名称相同,则可以删除第2步。


如果您真的必须按照自己的方式行事,这里的解决方案基于我使用this question for my own tasks的答案。

将以下NativeMethods类添加到您的代码中。

using System;
using System.Runtime.InteropServices;

/// <summary>
/// Implements P/Invoke Interop calls to the operating system.
/// </summary>
internal static class NativeMethods
{
    /// <summary>
    /// The type of logon operation to perform.
    /// </summary>
    internal 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 operations; therefore, it is
        /// inappropriate for some client/server applications, such as a
        /// mail server.
        /// </summary>
        Interactive = 2,

        /// <summary>
        /// This logon type is intended for high performance servers to
        /// authenticate plaintext passwords.
        /// The LogonUser function does not cache credentials for this
        /// logon type.
        /// </summary>
        Network = 3,

        /// <summary>
        /// This logon type is intended for batch servers, where processes
        /// may be executing on behalf of a user without their direct
        /// intervention.  This type is also for higher performance servers
        /// that process many plaintext authentication attempts at a time,
        /// such as mail or Web servers.
        /// The LogonUser function does not cache credentials for this
        /// logon type.
        /// </summary>
        Batch = 4,

        /// <summary>
        /// Indicates a service-type logon.  The account provided must have
        /// the service privilege enabled.
        /// </summary>
        Service = 5,

        /// <summary>
        /// This logon type is for GINA DLLs that log on users who will be
        /// interactively using the computer.
        /// This logon type can generate a unique audit record that shows
        /// when the workstation was unlocked.
        /// </summary>
        Unlock = 7,

        /// <summary>
        /// This logon type preserves the name and password in the
        /// authentication package, which allows the server to make
        /// connections to other network servers while impersonating the
        /// client.  A server can accept plaintext credentials from a
        /// client, call LogonUser, verify that the user can access the
        /// system across the network, and still communicate with other
        /// servers.
        /// NOTE: Windows NT:  This value is not supported.
        /// </summary>
        NetworkCleartext = 8,

        /// <summary>
        /// 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 identifier but uses different
        /// credentials for other network connections.
        /// NOTE: This logon type is supported only by the
        /// LOGON32_PROVIDER_WINNT50 logon provider.
        /// NOTE: Windows NT:  This value is not supported.
        /// </summary>
        NewCredentials = 9
    }

    /// <summary>
    /// Specifies the logon provider.
    /// </summary>
    internal enum LogonProvider : int
    {
        /// <summary>
        /// Use the standard logon provider for the system.
        /// The default security 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.
        /// NOTE: Windows 2000/NT:   The default security provider is NTLM.
        /// </summary>
        Default = 0,

        /// <summary>
        /// Use this provider if you'll be authenticating against a Windows
        /// NT 3.51 domain controller (uses the NT 3.51 logon provider).
        /// </summary>
        WinNT35 = 1,

        /// <summary>
        /// Use the NTLM logon provider.
        /// </summary>
        WinNT40 = 2,

        /// <summary>
        /// Use the negotiate logon provider.
        /// </summary>
        WinNT50 = 3
    }

    /// <summary>
    /// The type of logon operation to perform.
    /// </summary>
    internal enum SecurityImpersonationLevel : int
    {
        /// <summary>
        /// The server process cannot obtain identification information
        /// about the client, and it cannot impersonate the client.  It is
        /// defined with no value given, and thus, by ANSI C rules,
        /// defaults to a value of zero.
        /// </summary>
        Anonymous = 0,

        /// <summary>
        /// The server process can obtain information about the client,
        /// such as security identifiers and privileges, but it cannot
        /// impersonate the client.  This is useful for servers that export
        /// their own objects, for example, database products that export
        /// tables and views.  Using the retrieved client-security
        /// information, the server can make access-validation decisions
        /// without being able to use other services that are using the
        /// client's security context.
        /// </summary>
        Identification = 1,

        /// <summary>
        /// The server process can impersonate the client's security
        /// context on its local system.  The server cannot impersonate the
        /// client on remote systems.
        /// </summary>
        Impersonation = 2,

        /// <summary>
        /// The server process can impersonate the client's security
        /// context on remote systems.
        /// NOTE: Windows NT:  This impersonation level is not supported.
        /// </summary>
        Delegation = 3
    }

    /// <summary>
    /// Logs on the user.
    /// </summary>
    /// <param name="userName">Name of the user.</param>
    /// <param name="domain">The domain.</param>
    /// <param name="password">The password.</param>
    /// <param name="logonType">Type of the logon.</param>
    /// <param name="logonProvider">The logon provider.</param>
    /// <param name="token">The token.</param>
    /// <returns>True if the function succeeds, false if the function fails.
    /// To get extended error information, call GetLastError.</returns>
    [DllImport("advapi32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    internal static extern bool LogonUser(
        string userName,
        string domain,
        string password,
        LogonType logonType,
        LogonProvider logonProvider,
        out IntPtr token);

    /// <summary>
    /// Duplicates the token.
    /// </summary>
    /// <param name="existingTokenHandle">The existing token
    /// handle.</param>
    /// <param name="securityImpersonationLevel">The security impersonation
    /// level.</param>
    /// <param name="duplicateTokenHandle">The duplicate token
    /// handle.</param>
    /// <returns>True if the function succeeds, false if the function fails.
    /// To get extended error information, call GetLastError.</returns>
    [DllImport("advapi32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    internal static extern bool DuplicateToken(
        IntPtr existingTokenHandle,
        SecurityImpersonationLevel securityImpersonationLevel,
        out IntPtr duplicateTokenHandle);

    /// <summary>
    /// Closes the handle.
    /// </summary>
    /// <param name="handle">The handle.</param>
    /// <returns>True if the function succeeds, false if the function fails.
    /// To get extended error information, call GetLastError.</returns>
    [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    internal static extern bool CloseHandle(IntPtr handle);
}

以下是代码中使用的实现。

    IntPtr token;

    if (!NativeMethods.LogonUser(
        this.userName,
        this.domain,
        this.password,
        NativeMethods.LogonType.NewCredentials,
        NativeMethods.LogonProvider.Default,
        out token))
    {
        throw new Win32Exception();
    }

    try
    {
        IntPtr tokenDuplicate;

        if (!NativeMethods.DuplicateToken(
            token,
            NativeMethods.SecurityImpersonationLevel.Impersonation,
            out tokenDuplicate))
        {
            throw new Win32Exception();
        }

        try
        {
            using (WindowsImpersonationContext impersonationContext =
                new WindowsIdentity(tokenDuplicate).Impersonate())
            {
                //Copy your file to the windows directory here.

                impersonationContext.Undo();
                return;
            }
        }
        finally
        {
            if (tokenDuplicate != IntPtr.Zero)
            {
                if (!NativeMethods.CloseHandle(tokenDuplicate))
                {
                    // Uncomment if you need to know this case.
                    ////throw new Win32Exception();
                }
            }
        }
    }
    finally
    {
        if (token != IntPtr.Zero)
        {
            if (!NativeMethods.CloseHandle(token))
            {
                // Uncomment if you need to know this case.
                ////throw new Win32Exception();
            }
        }
    }

答案 1 :(得分:3)

正如其他人所说,你的解决方法打破了几个最佳实践,并且“只需要立即完成”是历史已经证明打破最佳实践的好时机。所以你应该先做一些建议:

  • 为此创建一个全新的帐户
  • 为该帐户提供所需的最低权限
  • 为该帐户提供非常短暂的(<1周)超时

这至少可以保证一年后的某个人不会偶然发现该程序,并且无处不在。现在有了这样的程序,它可能只需要一天,但已经指出安全性与这样的事情是徒劳的。

鉴于此,我找到了post talking about a breaking change in LogonUser。它要求更改您的DllImport代码:

[DllImport("advapi32.dll", SetLastError = true)]
private extern static bool LogonUser(
    string pszUsername, string pszDomain, string pszPassword,
    int dwLogonType, int dwLogonProvider, ref IntPtr phToken);

要:

[DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
public static extern bool LogonUser(String lpszUsername, String lpszDomain,
     String lpszPassword, int dwLogonType, int dwLogonProvider,
     out SafeTokenHandle phToken);

看看是否能够解决“仅适用于Windows XP”问题。

现在您已经找到了编程问题的解决方案,您真的需要与您的公司讨论,找出您的公司政策为什么要将您的IT部门破坏到部署新壁纸需要2个月的时间。这些问题可能会恶化到不能再修复不良做法的程度,因为这样做的时间表是如此。 (哦,服务帐户有一个三年前的密码,是一个域管理员,修好它需要大量的文书工作......)