Mike Jensen db8fd8499b ssh/tailssh: harden acceptEnv env transport, restore --encoded-env for skew
Changes included on top of the original commit:
  * Unify client-env checks through one shared filter, now also blocking GOTRACEBACK against secret re-leaks via crash dumps.
  * Never let forwarded vars override server-set keys in the child process.
  * Restore compatability for deployments and long term via --encoded-env as deprecated for outdated parents, with a loud warning to update tailscaled for security fixes.
  * Minor doc and comment corrections, including the nil-Cmd.Env state and the stale TODO.
  * Added end-to-end unit tests proving forwarded secrets reach the session but are not in flags or logged.

Change-Id: I58640515ebb9090ba419918d3c124c5482d63905

Change-Id: I73df55f9bb55e05690d337059f3bc1a294d27d90
Signed-off-by: Mike Jensen <mikej@tailscale.com>
2026-07-24 19:42:42 +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 1.26. (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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