# Domito

Windows kernel driver utilities library.

## About

Static library containing some unconventional and undocumented kernel space goodies for the adventurous kernel hacker 🙂 ~~Although I aim for stable code, I can not recommend it for production use; but it's mighty helpful in a lab environment to say the least! You've been warned!~~

Time to retire this disclaimer; it has done well for a couple years now on like half a million installs and counting so I think we're good 😉

Most of the logic you find here has been discovered and provided by the fine folks listed in the credits section below, I merely touched it up and molded into an utilities library for easy consumption in your own kernel driver project.

## Conventions

Custom types are prefixed with an all upper case `DOMITO_` and functions are prefixed with a Pascal case `Domito` to avoid conflicts with any system-provided names. The word "domito" is latin for "to tame".

## Environment

Built for and tested on **Windows 10 version 1507 (or newer) x64/ARM64**. 32-Bit might work too but who cares about that 😆

## Goals

- Stick to C-compatible exports and consumable types only.
  - I do not want to force any consumer of the library to drag C++ paradigms into their project. I do expect the user to utilize a modern compiler though, so the library sources themselves may have some 'C++-ish touches' here and there, for my own convenience 😉
- Compatibility with every Windows 10 version.
  - APIs not available on older builds will give you a `STATUS_NOT_IMPLEMENTED` instead of hard-linking and therefore making your driver fail to load 🤞
    - **Caution:** this claim comes with an asterisk though; due to PatchGuard (or some other security mechanism) I couldn't get run-time dynamic linking for `ci.dll` exports to work, so you need to actively avoid implementing code depending on exports that do not exist on earlier versions of Windows. Once I have a compatibility matrix for all of them I'll update the documentation accordingly.
- No conflicts with WDF or DMF
  - The consuming driver *may* (but doesn't have to) utilize Microsoft WDF or DMF in addition without having to fear any incompatibilities 💪
- Reliable SAL annotations.
  - I made sure to enrich the majority of the code with correct, tested annotations for Code Analysis to help you spot potential accidental API misuse 😎

## How to use

- Add the `include` directory to your project's headers search path.
  - To make your life easier I recommend setting an environment variable named `DOMITO_INC_PATH` to `...\Domito\include` absolute path and...
  - ...in your project add `$(DOMITO_INC_PATH);` to "Additional Include Directories".
- Add includes (preferably in the provided order):
  ```c
  #include <ntddk.h>
  #include <ntimage.h>
  #include <bcrypt.h>
  #include <Domito.h>
  ```
- Call `DomitoInit()` in your `DriverEntry` once to bootstrap internals.

### Manual linker settings

- Link against the resulting `Domito.lib` file for your desired architecture.
  - To make your life easier I recommend setting an environment variable named `DOMITO_LIB_PATH` to `...\Domito\lib` absolute path and...
  - ...in your project add `$(DOMITO_LIB_PATH)\$(DDKPlatform)\$(Configuration)\Domito.lib;$(DOMITO_LIB_PATH)\$(DDKPlatform)\ci.lib;` to "Additional Dependencies".
- Link against the provided `ci.lib` for the Code Integrity convenience functions.
- Link against `cng.lib` for the CNG BCrypt APIs.
- Done!

### Using the property sheet

Copy the provided `Domito.props` file into the directory of your `.vcxproj` file and customize it like below:

```xml
  <!-- The rest of the project file -->
  <ImportGroup Label="PropertySheets">
    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
  </ImportGroup>
  <!-- Create or update the following section below the above snippet -->
  <ImportGroup Label="PropertySheets">
    <!-- potential other custom sheet references -->
    <!-- Reference "Domito.props" here -->
    <Import Project="Domito.props" />
  </ImportGroup>
  <!-- The rest of the project file -->
```

## Sources & 3rd party credits

This library benefits from these awesome projects ❤ (appearance in no special order):

- [GetProcAddress implementation - for the Kernel](https://github.com/nefarius/WDF-Utils/blob/master/Snippets/WDM/GetProcAddress.md)
- [Implementation of GetProcAddress and GetModuleHandle
for Windows NT3.51/NT4/2000/XP/2003/Vista/7/8 kernel mode,
both 32 and 64 bit platforms](http://alter.org.ua/en/docs/nt_kernel/procaddr/)
- [Use ci.dll API for validating Authenticode signature of files](https://github.com/Ido-Moshe-Github/CiDllDemo)
  - [MiroKaku/CiDllDemo](https://github.com/MiroKaku/CiDllDemo)
  - [MiroKaku/Veil](https://github.com/MiroKaku/Veil)
- [Helper functions for calculating the authenticode digest for a portable executable file](https://github.com/mihaly044/pedigest)
- Custom memory allocator exposure inspired by SDL
  - [SDL_stdinc.h](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_stdinc.h)
  - [SDL_malloc.c](https://github.com/libsdl-org/SDL/blob/main/src/stdlib/SDL_malloc.c)
- [Authenticode (I): Understanding Windows Authenticode – RME-DisCo Research Group (reversea.me)](https://reversea.me/index.php/authenticode-i-understanding-windows-authenticode/)
- [Verifying Windows binaries, without Windows](https://blog.trailofbits.com/2020/05/27/verifying-windows-binaries-without-windows/)
- [Authenticode certificates and checks from a KM driver](https://astralvx.com/authenticode-certificates-and-checks-from-a-km-driver/)