James Tucker
de16943cbf
Add the one-shot "be-child ssh-fwd" children that perform forwarded socket work, and the monitor and client plumbing for the socket ops. The conn and session flows do not use the ops yet. The next commit routes them. - fwdchild.go: a child re-execed by the monitor, born unprivileged at clone. The monitor applies the connection's bound identity as SysProcAttr.Credential, so the kernel's DAC sees the connection user's permissions. It dials a unix socket, or creates one with umask-at-bind mode and optional unlink-if-owned, or binds a TCP listener, or creates the agent-forwarding socket in a user-owned directory. The result returns to the monitor over an inherited socketpair as one status line with at most one descriptor attached. - monitor.go: handleDial and handleListen run the ops on one-shot children with a spawn-to-result deadline, monFwdOpDeadline. On expiry the child's group is SIGKILLed. killChild reaps such a child with a bounded non-blocking wait. A child left in uninterruptible sleep is abandoned in its own group rather than blocking the loop goroutine. The dial and listen placeholder replies are gone, and their not-implemented test with them. - monitor_client.go: Dial, Listen, and ListenAgent over the existing request-ID plumbing. - incubator.go, monitor_linux.go, monitor_other.go: registration and per-platform spawn attributes for the fwd children. Tests drive real children across uid boundaries. They cover dial and bind round trips, unix and TCP listens, agent-listen directory hygiene, unlink-if-owned, peer-credential assertions, and the no-identity-keys-on-the-wire shape of every request. Forwarding children spawn with an empty environment through spawnRPCChild: they take everything from argv and the result socket, and the daemon's environment must not reach a child running as the connection's user. Updates tailscale/corp#50380 Signed-off-by: James Tucker <james@tailscale.com>
Tailscale
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:
- the Android app is at https://github.com/tailscale/tailscale-android
- the Synology package is at https://github.com/tailscale/tailscale-synology
- the QNAP package is at https://github.com/tailscale/tailscale-qpkg
- the Chocolatey packaging is at https://github.com/tailscale/tailscale-chocolatey
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:
- https://github.com/tailscale/tailscale/graphs/contributors
- https://github.com/tailscale/tailscale-android/graphs/contributors
Legal
WireGuard is a registered trademark of Jason A. Donenfeld.