James Tucker 84ca98e518 ssh/tailssh: enforce recording failure before notifying control
Cancel fail-closed sessions before sending recording upload failure
notifications. Bound each notifyControl request to five seconds, including
recorder connection failures on the synchronous session startup path.
An unresponsive control request must not keep an unrecorded session running
or indefinitely delay rejection or fail-open startup.

Keep the timeout local to each notification, independent of the session
and upload lifetime, without adding another goroutine. Test blocked
startup notifications in both rejection and fail-open modes, and use
virtual time to cover earlier and simultaneous cancellation/deadlines.

Send SFTP recording rejection diagnostics to stderr, preserving the binary protocol on stdout and exit status 254. Add real SSH/recorder tests for fail-closed and fail-open behavior with blocked notifications, and an SFTP client regression test.

Updates tailscale/corp#50380

Signed-off-by: James Tucker <james@tailscale.com>
Change-Id: I270d624975a6a9115502a4915ee5ff28a67d714b
2026-10-26 10:44:30 -07:00
2026-10-19 10:18:56 -07:00
2026-09-29 13:16:16 -07:00
2026-10-22 10:52:43 -04:00
2026-01-27 16:15:17 -08:00
2026-08-28 12:47:04 -07:00
2026-09-17 16:55:23 -07:00

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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