在运行时提升权限(Windows API C/C++) [英] Escalate Privilege at Runtime (Windows API C/C++)

问题描述

我的应用程序并不总是需要管理员"权限，而且大部分时间会以当前用户身份运行.有什么办法，我可以通过在我的程序已经运行后在运行时抛出 UAC 来升级 privs 吗?这只会在我需要 privs 时发生.而不是必须从高权限开始.

My application does not always require "admin" privileges and most of the time would run as the current user. Is there any way, I can escalate privs by throwing up a UAC at runtime after my program is already running? This will only happen as and when I need privs. Rather than having to start with high privs.

我知道runas"技术、清单文件等，但所有这些都是在进程创建之前而不是在运行时按需

I know the "runas" technique, manifest file etc. but all these are before the process is created and not at runtime, on-demand

推荐答案

恭喜，这正是 UAC 的设计方式，大多数应用程序开发人员要么太懒惰，要么太害怕，根本不敢考虑:)

Congratulations, that's exactly how UAC is designed to work, and something most application developers are either too lazy or too scared to ever contemplate looking at :)

简而言之，您将需要提升的代码放在单独的 COM 对象(位于 DLL 中)中，然后使用描述的方法创建它的提升实例 此处.

In a nutshell, you put the code that needs elevation in a separate COM object (that lives in a DLL), and then you create an elevated instance of it using the method described here.

HRESULT CoCreateInstanceAsAdmin(HWND hwnd, REFCLSID rclsid, REFIID riid, __out void ** ppv)
{
    BIND_OPTS3 bo;
    WCHAR  wszCLSID[50];
    WCHAR  wszMonikerName[300];

    StringFromGUID2(rclsid, wszCLSID, sizeof(wszCLSID)/sizeof(wszCLSID[0])); 
    HRESULT hr = StringCchPrintf(wszMonikerName, sizeof(wszMonikerName)/sizeof(wszMonikerName[0]),\
        L"Elevation:Administrator!new:%s", wszCLSID);
    if (FAILED(hr))
        return hr;
    memset(&bo, 0, sizeof(bo));
    bo.cbStruct = sizeof(bo);
    bo.hwnd = hwnd;
    bo.dwClassContext  = CLSCTX_LOCAL_SERVER;
    return CoGetObject(wszMonikerName, &bo, riid, ppv);
}

关键是名字的 Elevation:Administrator!new: 前缀.这会导致触发提升提示，并且将使用提升的令牌创建生成的 COM 对象.

The key is the Elevation:Administrator!new: prefix to the moniker name. This causes the elevation prompt to be triggered, and the resulting COM object will be created with an elevated token.

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