Joe Tsai 39d8cc3100 logtail: add support for authenticated log uploads
Control via tailcfg.NodeAttrLogUploadAuth may notify the node
that there is an authorization token to use when uploading logs.
If specified, then the logtail.Logger will use that token
when uploading.

Unfortunately, there is a time-of-use and time-of-check discrepency
that complicates logging. When logs are written under the context
of being for a particular node, we cannot store the token,
as it may be invalid by the time that the logs are uploaded.

Instead, we add Logger.SetAuthID to annotate subsequent log entries
with an identifier for the token to later use.
Only when we upload do we strip out the auth ID, lookup the
auth token to use, and then perform the upload.

We assume that control will notify the client of new tokens
well before they expire. Fetching a refreshed token
is not the job of the client.

Updates tailscale/corp#39092

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
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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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