How the boot program starts with administrator privileges when the system turns on UAC

Preface: This article explains that in the case of Windows system turned on UAC, the boot program needs to start with administrator privileges, the system pops up UAC dialog box, the user agrees to start the program

Process steps:

1. Determine the Windows System version (UAC is not included with Windows XP), and if the system version is higher than Windows XP, perform step 2;

2. Determine if the system turns on UAC, and if it is on, perform step 3;

3. Determine whether the process is currently started with administrator privileges, or if it is not administrator rights, perform step 4;

4. Call the ShellExecuteEx function with special parameters to restart the process.

The following is the reference code:

BOOL Isprocessrunasadmin ()
{
Sid_identifier_authority ntauthority = security_nt_authority;
PSID Administratorsgroup;

BOOL B = AllocateAndInitializeSid (
&ntauthority,
2,
Security_builtin_domain_rid,
Domain_alias_rid_admins,
0, 0, 0, 0, 0, 0,
&administratorsgroup);
if (b) {
CheckTokenMembership (NULL, Administratorsgroup, &b);
Freesid (Administratorsgroup);
}
return b = = TRUE;
}

int main (int argc, char* argv[])
{
Any action on the file is not allowed here, or it will cause the process to start failing
osVersionInfo osvi;
ZeroMemory (&OSVI, sizeof (OSVERSIONINFO));
osvi.dwosversioninfosize = sizeof (OSVERSIONINFO);
GetVersionEx (&OSVI);
if (5 < osvi.dwmajorversion) {
Std::wstring Wstrvalue;

The following function queries the registry, and the reader can implement it itself
int ireturn = Cutility::queryregvalue (HKEY_LOCAL_MACHINE, L "Software\\microsoft\\windows\\currentversion\\policies \\System ", L" EnableLUA ", Wstrvalue);
if (Success = = Ireturn) {
if (1 = = * (int*) wstrvalue.c_str () && false = = Isprocessrunasadmin ()) {
wchar_t Szpath[max_path] = {0};
GetModuleFileName (NULL, szpath, MAX_PATH);
Std::wcout << szpath << Std::endl;

Std::wstring Wstrparams;
for (int i = 1; i < argc; ++i) {
for (int j = 0; J < Std::strlen (Argv[i]); ++j) {
Wstrparams.push_back (static_cast<wchar_t> (argv[i][j));
}
}

Shellexecuteinfo sei = {0};
sei.cbsize = sizeof (SHELLEXECUTEINFOW);
Sei.fmask = See_mask_nocloseprocess | SEE_MASK_FLAG_NO_UI;
Sei.lpfile = szpath;
Sei.lpparameters = Wstrparams.c_str ();
Sei.nshow = Sw_show;
Sei.lpverb = TEXT ("runas");
Sei.lpdirectory = NULL;
BOOL IRet = ShellExecuteEx (&sei);
if (TRUE! = IRet) {
fprintf (stdout, "ShellExecuteEx Failure. Error Code is:%d ", GetLastError ());
}
return 0;
}
} else {
return 0;
}
}

}

How the boot program starts with administrator privileges when the system turns on UAC