Question

我正在使用IShellDispatch2.ShellExecute在提升权限的流程下以标准用户身份运行流程，如Raymond Chen's article中所述。与ShellExecuteEx不同，此方法不返回有关进程的任何信息。

我需要知道启动过程何时完成，并且可能需要其退出代码。有没有办法获取此过程的处理方式（除了拍摄快照以外的其他方式）？

Answer 1

您不能这样做，因为该外壳程序没有公开ShellExecuteEx方法，即使这样做，返回的进程句柄在您的进程中也无效。

我能想到的最简单的解决方案是创建一个小助手应用程序，该应用程序充当外壳程序和要启动的实际应用程序之间的中间人。当子进程退出时，此中间人应用程序可以调用ShellExecuteEx并将消息发送回您的真实应用程序。

Answer 2

您可以使用CreateProcessAsUserW来启动进程，而无需提升用户令牌。但是这里存在一些问题-如果 hToken 是调用者主令牌的受限版本，则需要SE_INCREASE_QUOTA_NAME和SE_ASSIGNPRIMARYTOKEN_NAME特权才能调用此api。

秒如何获取用户令牌？您可以为此使用WTSQueryUserToken，但要调用此api，您需要具有SE_TCB_NAME特权

因此您需要拥有/获得3个特权SE_ASSIGNPRIMARYTOKEN_NAME，SE_TCB_NAME和SE_INCREASE_QUOTA_NAME。通常，LocalSystem进程拥有它。如果我们有SE_DEBUG_PRIVILEGE，我们可以打开其中的一部分。

所以通常我们需要下一步：

获取自我SessionId（需要致电WTSQueryUserToken）
启用进程或线程令牌中的SE_DEBUG_PRIVILEGE（已升高令牌通常具有此特权）
具有令牌的搜索过程，这些过程需要具有特权
冒充此令牌
致电WTSQueryUserToken
致电CreateProcessAsUserW

-----代码：---------------

inline ULONG BOOL_TO_ERROR(BOOL f)
{
    return f ? NOERROR : GetLastError();
}

// use in _alloca(guz) because _alloca(0) work incorrect
// return 0 pointer instead allocates a zero-length item
volatile UCHAR guz;

ULONG takePrivileges(HANDLE hToken, ::PTOKEN_PRIVILEGES ptp, ULONG cb, BOOL& bContinue)
{
    if (ULONG PrivilegeCount = ptp->PrivilegeCount)
    {
        int n = 3;
        BOOL fAdjust = FALSE;

        ::PLUID_AND_ATTRIBUTES Privileges = ptp->Privileges;

        do 
        {
            switch (Privileges->Luid.LowPart)
            {
            case SE_ASSIGNPRIMARYTOKEN_PRIVILEGE:
            case SE_INCREASE_QUOTA_PRIVILEGE:
            case SE_TCB_PRIVILEGE:

                if (!(Privileges->Attributes & SE_PRIVILEGE_ENABLED))
                {
                    Privileges->Attributes |= SE_PRIVILEGE_ENABLED;
                    fAdjust = TRUE;
                }

                if (!--n)
                {
                    bContinue = FALSE;

                    ULONG dwError = BOOL_TO_ERROR(DuplicateTokenEx(hToken, 
                        TOKEN_ADJUST_PRIVILEGES|TOKEN_IMPERSONATE, 
                        0, ::SecurityImpersonation, ::TokenImpersonation, 
                        &hToken));

                    if (dwError == NOERROR)
                    {
                        if (fAdjust)
                        {
                            AdjustTokenPrivileges(hToken, FALSE, ptp, cb, NULL, NULL);
                            dwError = GetLastError();
                        }

                        if (dwError == NOERROR)
                        {
                            dwError = BOOL_TO_ERROR(SetThreadToken(0, hToken));
                        }

                        CloseHandle(hToken);
                    }

                    return dwError;
                }
            }
        } while (Privileges++, --PrivilegeCount);
    }

    return ERROR_NOT_FOUND;
}

ULONG GetPrivileges()
{
    ULONG dwError;

    HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);

    if (hSnapshot != INVALID_HANDLE_VALUE)
    {
        dwError = ERROR_NOT_FOUND;

        PROCESSENTRY32W pe = { sizeof(pe) };

        if (Process32FirstW(hSnapshot, &pe))
        {
            ULONG cb = 0, rcb = 0x100;

            PVOID stack = alloca(guz);

            union {
                PVOID buf;
                ::PTOKEN_PRIVILEGES ptp;
            };

            BOOL bContinue = TRUE;

            do 
            {
                if (HANDLE hProcess = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, pe.th32ProcessID))
                {
                    HANDLE hToken;

                    if (OpenProcessToken(hProcess, TOKEN_QUERY|TOKEN_DUPLICATE, &hToken))
                    {
                        do 
                        {
                            if (cb < rcb)
                            {
                                cb = RtlPointerToOffset(buf = alloca(rcb - cb), stack);
                            }

                            if (GetTokenInformation(hToken, ::TokenPrivileges, buf, cb, &rcb))
                            {
                                dwError = takePrivileges(hToken, ptp, rcb, bContinue);
                                break;
                            }

                        } while (GetLastError() == ERROR_INSUFFICIENT_BUFFER);

                        CloseHandle(hToken);
                    }

                    CloseHandle(hProcess);
                }
            } while (bContinue && Process32NextW(hSnapshot, &pe));
        }

        CloseHandle(hSnapshot);
    }
    else
    {
        dwError = GetLastError();
    }

    return dwError;
}

ULONG RunNotElevated(PCWSTR lpApplicationName, PWSTR lpCommandLine, PCWSTR lpCurrentDirectory)
{
    HANDLE hToken, hDupToken = 0;

    ULONG SessionId;

    ULONG dwError = BOOL_TO_ERROR(ProcessIdToSessionId(GetCurrentProcessId(), &SessionId));

    if (NOERROR == dwError && 
        (NOERROR == (dwError = BOOL_TO_ERROR(OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY|TOKEN_DUPLICATE, &hToken)))))
    {
        dwError = BOOL_TO_ERROR(DuplicateTokenEx(hToken, 
            TOKEN_IMPERSONATE|TOKEN_ADJUST_PRIVILEGES, 0,
            ::SecurityImpersonation, ::TokenImpersonation, &hDupToken));

        CloseHandle(hToken);

        if (dwError == NOERROR)
        {
            // get SE_DEBUG_PRIVILEGE

            static ::TOKEN_PRIVILEGES tp = { 1, { { {SE_DEBUG_PRIVILEGE }, SE_PRIVILEGE_ENABLED } } };

            AdjustTokenPrivileges(hDupToken, FALSE, &tp, 0, 0, 0);

            if ((dwError = GetLastError()) == NOERROR)
            {
                dwError = BOOL_TO_ERROR(SetThreadToken(0, hDupToken));
            }

            CloseHandle(hDupToken);

            if (dwError == NOERROR)
            {
                if (NOERROR == (dwError = GetPrivileges()))
                {
                    STARTUPINFOW si = { sizeof(si) };
                    PROCESS_INFORMATION pi;

                    PVOID lpEnvironment;

                    if (WTSQueryUserToken(SessionId, &hToken))
                    {
                        dwError = BOOL_TO_ERROR(CreateEnvironmentBlock(&lpEnvironment, hToken, FALSE));

                        if (dwError == NOERROR)
                        {
                            dwError = BOOL_TO_ERROR(CreateProcessAsUserW(
                                hToken, lpApplicationName, lpCommandLine, 
                                NULL, NULL, FALSE, CREATE_UNICODE_ENVIRONMENT,
                                lpEnvironment, lpCurrentDirectory, &si, &pi));

                            DestroyEnvironmentBlock(lpEnvironment);
                        }
                        CloseHandle(hToken);

                        if (dwError == NOERROR)
                        {
                            CloseHandle(pi.hThread);
                            CloseHandle(pi.hProcess);
                        }
                    }
                }

                SetThreadToken(0, 0);
            }
        }
    }

    return dwError;
}

void test_r()
{
    WCHAR cmd[MAX_PATH];
    if (GetEnvironmentVariable(L"comspec", cmd, RTL_NUMBER_OF(cmd)))
    {
        RunNotElevated1(cmd, L"cmd /k whoami /all",0);
    }
}

等待IShellDispatch2.ShellExecute启动的过程

2 个答案: