我在UAC对话框中回答“是”后启动了一个提升的进程。
这个过程很好,一切都按预期工作。
现在我需要在某个时候“忽视”这个过程,换句话说,过程应该不会像用户正常启动那样完全升级。
示例方案
有办法做到这一点吗?
答案 0 :(得分:3)
提升的进程已链接令牌 - 它指的是非提升的用户会话。我们可以通过两种方式使用这个链接的令牌:
第一种方式:
TokenPrimary
(为此我们需要SE_TCB_PRIVILEGE
当我们查询此标记时)SE_ASSIGNPRIMARYTOKEN_PRIVILEGE
和SE_INCREASE_QUOTA_PRIVILEGE
CreateProcessAsUser
之前。因为提升的令牌有
SE_DEBUG_PRIVILEGE
任务是可能的第二种方式:
从链接令牌(AuthenticationId
)查询登录会话ID
来自TOKEN_STATISTICS
)
在流程令牌中找到了具有相同AuthenticationId
的流程。
通过帮助将此过程用作父进程
PROC_THREAD_ATTRIBUTE_PARENT_PROCESS
实施方式1:
static volatile UCHAR guz;
ULONG RunNonElevated(HANDLE hToken, HANDLE hMyToken, PCWSTR lpApplicationName, PWSTR lpCommandLine)
{
ULONG err;
PVOID stack = alloca(guz);
ULONG cb = 0, rcb = FIELD_OFFSET(TOKEN_PRIVILEGES, Privileges[SE_MAX_WELL_KNOWN_PRIVILEGE]);
union {
PVOID buf;
PTOKEN_PRIVILEGES ptp;
};
do
{
if (cb < rcb)
{
cb = RtlPointerToOffset(buf = alloca(rcb - cb), stack);
}
if (GetTokenInformation(hToken, TokenPrivileges, buf, cb, &rcb))
{
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)
{
err = NOERROR;
if (DuplicateTokenEx(hToken,
TOKEN_ADJUST_PRIVILEGES|TOKEN_IMPERSONATE,
0, SecurityImpersonation, TokenImpersonation,
&hToken))
{
if (fAdjust)
{
AdjustTokenPrivileges(hToken, FALSE, ptp, rcb, NULL, NULL);
err = GetLastError();
}
if (err == NOERROR)
{
if (SetThreadToken(0, hToken))
{
TOKEN_LINKED_TOKEN tlt;
if (GetTokenInformation(hMyToken, TokenLinkedToken, &tlt, sizeof(tlt), &rcb))
{
STARTUPINFO si = { sizeof (si) };
PROCESS_INFORMATION pi;
if (!CreateProcessAsUserW(tlt.LinkedToken, lpApplicationName, lpCommandLine,
NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi))
{
err = GetLastError();
}
CloseHandle(tlt.LinkedToken);
if (err == NOERROR)
{
CloseHandle(pi.hThread);
CloseHandle(pi.hProcess);
}
}
else
{
err = GetLastError();
}
SetThreadToken(0, 0);
}
else
{
err = GetLastError();
}
}
CloseHandle(hToken);
}
else
{
err = GetLastError();
}
return err;
}
}
} while (Privileges++, --PrivilegeCount);
}
return ERROR_NOT_FOUND;
}
} while ((err = GetLastError()) == ERROR_INSUFFICIENT_BUFFER);
return err;
}
ULONG RunNonElevated(HANDLE hMyToken, PCWSTR lpApplicationName, PWSTR lpCommandLine)
{
static TOKEN_PRIVILEGES tp = {
1, { { { SE_DEBUG_PRIVILEGE } , SE_PRIVILEGE_ENABLED } }
};
AdjustTokenPrivileges(hMyToken, FALSE, &tp, sizeof(tp), NULL, NULL);
ULONG err = NOERROR;
// much more effective of course use NtQuerySystemInformation(SystemProcessesAndThreadsInformation) here
HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0), hToken;
if (hSnapshot != INVALID_HANDLE_VALUE)
{
PROCESSENTRY32W pe = { sizeof(pe) };
if (Process32FirstW(hSnapshot, &pe))
{
err = ERROR_NOT_FOUND;
do
{
if (pe.th32ProcessID && pe.th32ParentProcessID)
{
if (HANDLE hProcess = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, pe.th32ProcessID))
{
if (OpenProcessToken(hProcess, TOKEN_QUERY|TOKEN_DUPLICATE, &hToken))
{
err = RunNonElevated(hToken, hMyToken, lpApplicationName, lpCommandLine);
CloseHandle(hToken);
}
else
{
err = GetLastError();
}
CloseHandle(hProcess);
}
else
{
err = GetLastError();
}
}
} while (err && Process32NextW(hSnapshot, &pe));
}
else
{
err = GetLastError();
}
CloseHandle(hSnapshot);
}
return err;
}
ULONG RunNonElevated(PCWSTR lpApplicationName, PWSTR lpCommandLine)
{
HANDLE hToken;
ULONG err = NOERROR;
if (OpenProcessToken(NtCurrentProcess(), TOKEN_QUERY|TOKEN_ADJUST_PRIVILEGES, &hToken))
{
TOKEN_ELEVATION_TYPE tet;
ULONG rcb;
if (GetTokenInformation(hToken, ::TokenElevationType, &tet, sizeof(tet), &rcb))
{
if (tet == TokenElevationTypeFull)
{
RunNonElevated(hToken, lpApplicationName, lpCommandLine);
}
else
{
err = ERROR_ALREADY_ASSIGNED;
}
}
else
{
err = GetLastError();
}
CloseHandle(hToken);
}
else
{
err = GetLastError();
}
return err;
}
实施方式2:
ULONG CreateProcessEx(HANDLE hProcess,
PCWSTR lpApplicationName,
PWSTR lpCommandLine)
{
SIZE_T Size = 0;
STARTUPINFOEX si = { sizeof(si) };
PROCESS_INFORMATION pi;
InitializeProcThreadAttributeList(0, 1, 0, &Size);
ULONG err = GetLastError();
if (err = ERROR_INSUFFICIENT_BUFFER)
{
si.lpAttributeList = (PPROC_THREAD_ATTRIBUTE_LIST)alloca(Size);
if (InitializeProcThreadAttributeList(si.lpAttributeList, 1, 0, &Size))
{
if (UpdateProcThreadAttribute(si.lpAttributeList, 0,
PROC_THREAD_ATTRIBUTE_PARENT_PROCESS, &hProcess, sizeof(hProcess), 0, 0) &&
CreateProcessW(lpApplicationName, lpCommandLine, 0, 0, 0,
EXTENDED_STARTUPINFO_PRESENT, 0, 0, &si.StartupInfo, &pi))
{
CloseHandle(pi.hThread);
CloseHandle(pi.hProcess);
}
else
{
err = GetLastError();
}
DeleteProcThreadAttributeList(si.lpAttributeList);
}
else
{
err = GetLastError();
}
}
else
{
err = GetLastError();
}
return err;
}
ULONG CreateProcessEx(LUID AuthenticationId,
PCWSTR lpApplicationName,
PWSTR lpCommandLine)
{
ULONG err = ERROR_NOT_FOUND;
HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
if (hSnapshot != INVALID_HANDLE_VALUE)
{
PROCESSENTRY32W pe = { sizeof(pe) };
ULONG rcb;
if (Process32First(hSnapshot, &pe))
{
err = ERROR_NOT_FOUND;
BOOL found = FALSE;
do
{
if (pe.th32ProcessID && pe.th32ParentProcessID)
{
if (HANDLE hProcess = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION|PROCESS_CREATE_PROCESS, FALSE, pe.th32ProcessID))
{
HANDLE hToken;
if (OpenProcessToken(hProcess, TOKEN_QUERY, &hToken))
{
TOKEN_STATISTICS ts;
if (GetTokenInformation(hToken, TokenStatistics, &ts, sizeof(ts), &rcb))
{
if (ts.AuthenticationId.LowPart == AuthenticationId.LowPart &&
ts.AuthenticationId.HighPart == AuthenticationId.HighPart)
{
found = TRUE;
err = CreateProcessEx(hProcess,
lpApplicationName,
lpCommandLine);
}
}
CloseHandle(hToken);
}
CloseHandle(hProcess);
}
}
} while (!found && Process32Next(hSnapshot, &pe));
}
else
{
err = GetLastError();
}
CloseHandle(hSnapshot);
}
else
{
err = GetLastError();
}
return err;
}
ULONG CreateProcessEx(PCWSTR lpApplicationName,
PWSTR lpCommandLine)
{
HANDLE hToken;
ULONG err = NOERROR;
if (OpenProcessToken(NtCurrentProcess(), TOKEN_QUERY, &hToken))
{
union {
TOKEN_ELEVATION_TYPE tet;
TOKEN_LINKED_TOKEN tlt;
};
ULONG rcb;
if (GetTokenInformation(hToken, TokenElevationType, &tet, sizeof(tet), &rcb))
{
if (tet == TokenElevationTypeFull)
{
if (GetTokenInformation(hToken, TokenLinkedToken, &tlt, sizeof(tlt), &rcb))
{
TOKEN_STATISTICS ts;
BOOL fOk = GetTokenInformation(tlt.LinkedToken, TokenStatistics, &ts, sizeof(ts), &rcb);
CloseHandle(tlt.LinkedToken);
if (fOk)
{
err = CreateProcessEx(ts.AuthenticationId,
lpApplicationName,
lpCommandLine);
}
else
{
err = GetLastError();
}
}
else
{
err = GetLastError();
}
}
else
{
err = ERROR_ALREADY_ASSIGNED;
}
}
else
{
err = GetLastError();
}
CloseHandle(hToken);
}
else
{
err = GetLastError();
}
return err;
}
并测试:
WCHAR ApplicationName[MAX_PATH];
if (GetEnvironmentVariableW(L"ComSpec", ApplicationName, RTL_NUMBER_OF(ApplicationName)))
{
WCHAR cmdline[] = L"cmd.exe /k whoami /priv /groups\r\n";
CreateProcessEx(ApplicationName, cmdline);
RunNonElevated(ApplicationName, cmdline);
}
对于#2理论,我们找不到具有相同登录ID(AuthenticationId
)的进程,就像在我们的链接令牌中一样。但方式#1总是必须工作。始终存在系统进程,其中SeTcbPrivilege
(用于获取主要形式的链接令牌)+ SeAssignPrimaryTokenPrivilege
(用于CreateProcessAsUser
)(SeIncreaseQuotaPrivilege
在msdn中监听{{1但是在我的测试中,即使没有启用此权限也能正常工作)。但是,所有系统进程(作为CreateProcessAsUser
运行)在令牌中具有此3权限(从LocalSystem
开始),并且某些系统进程始终在系统中运行。
所以方式#1必须永远不会失败并且首选。我们也可以在这里使用来自我们进程的继承句柄,用于与子进程交互。这在#2中是不可能的。它显示的是图片的完整性
一开始我们检查TOKEN_ELEVATION_TYPE
并做好工作,只有smss.exe
。如果TokenElevationTypeFull
我们没有提升过程 - 所以没有任何东西。
case TokenElevationTypeLimited
表示或UAC如果关闭(LUA禁用)或我们作为内置管理员运行,并且lua没有过滤此帐户的令牌(因此所有进程都是&#34;提升&#34;或更确切地说它是令牌没有通过TokenElevationTypeDefault
过滤 - 在这种情况下也没有意义尝试运行&#34;没有提升&#34;此用户下的流程