Brad Fitzpatrick 547f371657 ssh/tailssh, feature/ssh, cmd/tailscaled: run the Tailscale SSH server on Windows
Add the Windows versions of the per-OS hooks and build the SSH server on
Windows. As LocalSystem (the service), tailscaled logs the target user on
with an S4U logon via util/winutil/s4u and runs the session process with
that user's token, with pipes or, for PTYs, the s4u pseudoconsole relay.
A non-LocalSystem tailscaled can only run sessions as itself. SFTP runs
"tailscaled be-child sftp" as the user.

The shell follows OpenSSH for Windows's DefaultShell registry value, else
pwsh, Windows PowerShell, or cmd.exe. OpenSSH's host keys are reused when
readable. Policy user names match Windows accounts case-insensitively;
"=" treats LocalSystem and the built-in Administrator as root. Agent
forwarding is not supported.

TestTailscaleSSH in tstest/integration covers the same-user path on all
platforms and, with --run-windows-service-tests, the S4U path.

Updates #4697

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Change-Id: I9e3f1a7c5b2d4e6f8a0c2b4d6e8f1a3c5b7d9e2f
2026-09-28 20:46:07 +00:00
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Tailscale

https://tailscale.com

Private WireGuard® networks made easy

Overview

This repository contains the majority of Tailscale's open source code. Notably, it includes the tailscaled daemon and the tailscale CLI tool. The tailscaled daemon runs on Linux, Windows, macOS, and to varying degrees on FreeBSD and OpenBSD. The Tailscale iOS and Android apps use this repo's code, but this repo doesn't contain the mobile GUI code.

Other Tailscale repos of note:

For background on which parts of Tailscale are open source and why, see https://tailscale.com/opensource/.

Using

We serve packages for a variety of distros and platforms at https://pkgs.tailscale.com.

Other clients

The macOS, iOS, and Windows clients use the code in this repository but additionally include small GUI wrappers. The GUI wrappers on non-open source platforms are themselves not open source.

Building

We always require the latest Go release, currently Go 1.27. (While we build releases with our Go fork, its use is not required.)

go install tailscale.com/cmd/tailscale{,d}

If you're packaging Tailscale for distribution, use build_dist.sh instead, to burn commit IDs and version info into the binaries:

./build_dist.sh tailscale.com/cmd/tailscale
./build_dist.sh tailscale.com/cmd/tailscaled

If your distro has conventions that preclude the use of build_dist.sh, please do the equivalent of what it does in your distro's way, so that bug reports contain useful version information.

Bugs

Please file any issues about this code or the hosted service on the issue tracker.

Contributing

PRs welcome! But please file bugs. Commit messages should reference bugs.

We require Developer Certificate of Origin Signed-off-by lines in commits.

See commit-messages.md (or skim git log) for our commit message style.

About Us

Tailscale is primarily developed by the people at https://github.com/orgs/tailscale/people. For other contributors, see:

WireGuard is a registered trademark of Jason A. Donenfeld.

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