Andrew Dunham 5869f14e74 net/{currenttime,tlsdial}: add minimum possible time for TLS
This adds a new package, net/currenttime, which is a thin wrapper around
time.Now. If the value returned by time.Now is before a hard-coded value
baked into the binary, that hard-coded value will be returned instead.
In the case where the system has a buggy, malfunctioning, or nonexistent
RTC, this can improve the likelihood that Tailscale will be able to
establish a connection to the control plane (via TLS) and fetch the
server certificate.

As a future TODO: we should cache this value on-disk between process
starts (possibly in the state file?) so that we succeed even if the
Tailscale server certificate has already expired from the perspective of
the minimum time.

Additionally, add a GitHub workflow that bumps the current time to a new
value every 14 days, so that the value stays reasonably up-to-date in
our repository without introducing impurities into the build process.

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: If63cf28c4f188993894d3de589fd65ad447def6f
2025-03-10 16:38:44 -04:00
2025-03-05 08:54:00 -08:00
2024-04-16 15:32:38 -07:00
2024-04-16 15:32:38 -07:00
2024-06-05 15:24:04 -07:00
2020-02-10 22:16:30 -08:00
2024-08-29 17:25:13 +02:00
2024-03-08 15:24:36 -08:00

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 1.23. (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 git log for our commit message style. It's basically the same as Go's 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.

Description
The easiest, most secure way to use WireGuard and 2FA.
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