120 lines
6.3 KiB
Markdown
120 lines
6.3 KiB
Markdown
# [Wintun Network Adapter](https://www.wintun.net/)
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### TUN Device Driver for Windows
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This is a layer 3 TUN driver for Windows 7, 8, 8.1, and 10. Originally created for [WireGuard](https://www.wireguard.com/), it is intended to be useful to a wide variety of projects that require layer 3 tunneling devices with implementations primarily in userspace.
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## Build Requirements
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- [Visual Studio 2019](https://visualstudio.microsoft.com/downloads/)
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- [Windows Driver Kit for Windows 10, version 1903](https://docs.microsoft.com/en-us/windows-hardware/drivers/download-the-wdk)
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- [WiX Toolset 3.11.1](http://wixtoolset.org/releases/)
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## Digital Signing
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Digital signing is integral part of the build process. By default, the driver will be test-signed using a certificate that the WDK should automatically generate. To subsequently load the driver, you will need to put your computer into test mode by executing as Administrator `bcdedit /set testsigning on`.
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If you possess an EV certificate for kernel mode code signing you should switch TUN driver digital signing from test-signing to production-signing by authoring your `wintun.vcxproj.user` file to look something like this:
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```xml
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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<PropertyGroup>
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<SignMode>ProductionSign</SignMode>
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<CrossCertificateFile>$(WDKContentRoot)CrossCertificates\DigiCert_High_Assurance_EV_Root_CA.crt</CrossCertificateFile>
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<ProductionCertificate>DF98E075A012ED8C86FBCF14854B8F9555CB3D45</ProductionCertificate>
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<TimestampServer>http://timestamp.digicert.com</TimestampServer>
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</PropertyGroup>
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</Project>
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```
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Modify the `<CrossCertificateFile>` to contain the full path to the cross-signing certificate of CA that issued your certificate. You should be able to find its `.crt` file in `C:\Program Files (x86)\Windows Kits\10\CrossCertificates`. Note that the `$(WDKContentRoot)` expands to `C:\Program Files (x86)\Windows Kits\10\`.
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If you already have `wintun.vcxproj.user` file, just add the `<PropertyGroup>` section.
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## Building from Command Line
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Open _Developer Command Prompt for VS 2019_ and use the `msbuild` command:
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```
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msbuild wintun.proj [/t:<target>]
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```
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### Targets
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- `Build`: Builds the driver release configurations of all supported platforms. This is the default target.
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- `Clean`: Deletes all intermediate and output files.
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- `Rebuild`: Alias for `Clean` followed by `Build`.
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- `SDV`: Runs Static Driver Verifier, which includes a clean driver build, only for AMD64 release configuration.
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- `DVL`: Runs the `SDV`, and creates a Driver Verification Log, only for AMD64 release configurations.
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- `MSM`: Builds Microsoft Installer Merge Modules in `<output folder>\wintun-<platform>-<version>.msm`. Requires WHQL signed driver.
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The driver output folders are:
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Platform and Configuration | Folder
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-------------------------- | --------------------
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x86 Debug | `x86\Debug\wintun`
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x86 Release | `x86\Release\wintun`
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AMD64 Debug | `amd64\Debug\wintun`
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AMD64 Release | `amd64\Release\wintun`
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ARM64 Debug | `arm64\Debug\wintun`
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ARM64 Release | `arm64\Release\wintun`
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Do note that since the `Build` target builds for all supported platforms, you will need to have the toolchains installed for those platforms.
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#### Building Microsoft Installer Merge Modules
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1. `msbuild wintun.proj /t:DVL;Build`.
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2. Perform Windows Hardware Lab Kit tests.
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3. Submit submission package to Microsoft.
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4. Copy WHQL-signed driver to `x86\Release\whql\` and `amd64\Release\whql\` subfolders.
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5. `msbuild wintun.proj /t:MSM`
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6. MSM files are placed in `dist` subfolder.
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Note: due to the use of SHA256 signatures throughout, Windows 7 users who would like a prompt-less installation generally need to have the [KB2921916 hotfix](https://support.microsoft.com/en-us/help/2921916/the-untrusted-publisher-dialog-box-appears-when-you-install-a-driver-i) installed, which can be obtained from these mirrors: [amd64](https://download.wireguard.com/windows-toolchain/distfiles/Windows6.1-KB2921916-x64.msu) and [x86](https://download.wireguard.com/windows-toolchain/distfiles/Windows6.1-KB2921916-x86.msu).
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## Usage
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After loading the driver and creating a network interface the typical way using [SetupAPI](https://docs.microsoft.com/en-us/windows-hardware/drivers/install/setupapi), open `\\.\Device\WINTUN%d` as Local System, where `%d` is the [LUID](https://docs.microsoft.com/en-us/windows/desktop/api/ifdef/ns-ifdef-_net_luid_lh) index (`NetLuidIndex` member) of the network device. You may then [`ReadFile`](https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-readfile) and [`WriteFile`](https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-writefile) bundles of packets of the following format:
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```
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+------------------------------+
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| size_0 |
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| 4 bytes, native endian |
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+------------------------------+
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| packet_0 |
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| size_0 bytes |
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~ ~
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+------------------------------+
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| padding |
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| 4-(size_0&3) bytes |
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+------------------------------+
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| size_1 |
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| 4 bytes, native endian |
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+------------------------------+
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| packet_1 |
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| size_1 bytes |
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~ ~
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+------------------------------+
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| padding |
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| 4-(size_1&3) bytes |
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+------------------------------+
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~ ~
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```
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Each packet segment should contain a layer 3 IPv4 or IPv6 packet. Up to 15728640 bytes may be read or written during each call to `ReadFile` or `WriteFile`. All calls to `ReadFile` must be called with the same virtual address, for a given handle. This virtual address must reference pages that are writable for the same length as passed to the first call of `ReadFile`.
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It is advisable to use [overlapped I/O](https://docs.microsoft.com/en-us/windows/desktop/sync/synchronization-and-overlapped-input-and-output) for this. If using blocking I/O instead, it may be desirable to open separate handles for reading and writing.
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