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/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (C) 2018-2019 WireGuard LLC. All Rights Reserved.
*/
#include "installation.h"
#include <Windows.h>
#include <tlhelp32.h>
#include <stdio.h>
#include <conio.h>
#include <tchar.h>
#pragma warning(disable : 4100) /* unreferenced formal parameter */
static VOID
ConsoleLogger(_In_ LOGGER_LEVEL Level, _In_ const TCHAR *LogLine)
{
TCHAR *Template;
switch (Level)
{
case LOG_INFO:
Template = TEXT("[+] %s\n");
break;
case LOG_WARN:
Template = TEXT("[-] %s\n");
break;
case LOG_ERR:
Template = TEXT("[!] %s\n");
break;
default:
return;
}
_ftprintf(stdout, Template, LogLine);
}
static BOOL ElevateToSystem(VOID)
{
HANDLE ThreadToken, ProcessSnapshot, WinlogonProcess, WinlogonToken, DuplicatedToken;
PROCESSENTRY32 ProcessEntry = { .dwSize = sizeof(PROCESSENTRY32) };
BOOL Ret;
DWORD LastError = ERROR_SUCCESS;
TOKEN_PRIVILEGES Privileges = { .PrivilegeCount = 1, .Privileges = { { .Attributes = SE_PRIVILEGE_ENABLED } } };
CHAR LocalSystemSid[0x400];
DWORD RequiredBytes = sizeof(LocalSystemSid);
if (!CreateWellKnownSid(WinLocalSystemSid, NULL, &LocalSystemSid, &RequiredBytes))
goto cleanup;
struct
{
TOKEN_USER MaybeLocalSystem;
CHAR LargeEnoughForLocalSystem[0x400];
} TokenUserBuffer;
if (!GetTokenInformation(
GetCurrentProcessToken(), TokenUser, &TokenUserBuffer, sizeof(TokenUserBuffer), &RequiredBytes))
goto cleanup;
if (EqualSid(TokenUserBuffer.MaybeLocalSystem.User.Sid, LocalSystemSid))
return TRUE;
if (!LookupPrivilegeValue(NULL, SE_DEBUG_NAME, &Privileges.Privileges[0].Luid))
goto cleanup;
ProcessSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
if (ProcessSnapshot == INVALID_HANDLE_VALUE)
goto cleanup;
for (Ret = Process32First(ProcessSnapshot, &ProcessEntry); Ret;
LastError = GetLastError(), Ret = Process32Next(ProcessSnapshot, &ProcessEntry))
{
if (_tcsicmp(ProcessEntry.szExeFile, TEXT("winlogon.exe")))
continue;
RevertToSelf();
if (!ImpersonateSelf(SecurityImpersonation))
continue;
if (!OpenThreadToken(GetCurrentThread(), TOKEN_ADJUST_PRIVILEGES, FALSE, &ThreadToken))
continue;
if (!AdjustTokenPrivileges(ThreadToken, FALSE, &Privileges, sizeof(Privileges), NULL, NULL))
{
LastError = GetLastError();
CloseHandle(ThreadToken);
continue;
}
CloseHandle(ThreadToken);
WinlogonProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, ProcessEntry.th32ProcessID);
if (!WinlogonProcess)
continue;
if (!OpenProcessToken(WinlogonProcess, TOKEN_IMPERSONATE | TOKEN_DUPLICATE, &WinlogonToken))
continue;
CloseHandle(WinlogonProcess);
if (!DuplicateToken(WinlogonToken, SecurityImpersonation, &DuplicatedToken))
{
LastError = GetLastError();
continue;
}
CloseHandle(WinlogonToken);
if (!GetTokenInformation(DuplicatedToken, TokenUser, &TokenUserBuffer, sizeof(TokenUserBuffer), &RequiredBytes))
goto next;
if (SetLastError(ERROR_ACCESS_DENIED), !EqualSid(TokenUserBuffer.MaybeLocalSystem.User.Sid, LocalSystemSid))
goto next;
if (!SetThreadToken(NULL, DuplicatedToken))
goto next;
CloseHandle(DuplicatedToken);
CloseHandle(ProcessSnapshot);
SetLastError(ERROR_SUCCESS);
return TRUE;
next:
LastError = GetLastError();
CloseHandle(DuplicatedToken);
}
RevertToSelf();
CloseHandle(ProcessSnapshot);
cleanup:
SetLastError(LastError);
return FALSE;
}
static VOID
RunAsAdministrator(HWND hwnd, TCHAR *Verb, int nCmdShow)
{
TOKEN_ELEVATION Elevation;
DWORD Required;
if (!GetTokenInformation(GetCurrentProcessToken(), TokenElevation, &Elevation, sizeof(Elevation), &Required))
return;
if (Elevation.TokenIsElevated)
return;
TCHAR ProcessPath[MAX_PATH], DllPath[MAX_PATH];
if (!GetModuleFileName(NULL, ProcessPath, _countof(ProcessPath)) ||
!GetModuleFileName(ResourceModule, DllPath, _countof(DllPath)))
return;
TCHAR Params[0x1000];
_stprintf_s(Params, _countof(Params), TEXT("\"%s\",%s"), DllPath, Verb);
ShellExecute(hwnd, TEXT("runas"), ProcessPath, Params, NULL, nCmdShow);
exit(0);
}
static VOID
Do(BOOL Install, BOOL ShowConsole)
{
if (ShowConsole)
{
AllocConsole();
FILE *Stream;
freopen_s(&Stream, "CONOUT$", "w", stdout);
}
SetLogger(ConsoleLogger);
ElevateToSystem();
Install ? InstallOrUpdate() : Uninstall();
RevertToSelf();
_putws(TEXT("\nPress any key to close . . ."));
(VOID) _getch();
}
VOID __stdcall InstallWintun(HWND hwnd, HINSTANCE hinst, LPSTR lpszCmdLine, int nCmdShow)
{
RunAsAdministrator(hwnd, TEXT(__FUNCTION__), nCmdShow);
Do(TRUE, !!nCmdShow);
}
VOID __stdcall UninstallWintun(HWND hwnd, HINSTANCE hinst, LPSTR lpszCmdLine, int nCmdShow)
{
RunAsAdministrator(hwnd, TEXT(__FUNCTION__) , nCmdShow);
Do(FALSE, !!nCmdShow);
}
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