Thomas Desrosiers
7add2af9ec
The TLS probe fetched and parsed the leaf certificate's CRL on every run. That is fine when the CRL is small, but some CAs publish CRLs of several megabytes: the one for the AWS ACM R2M04 intermediate is about 2.5MB, which at the default 15s interval is a continuous 170kB/s per probed node. Cache parsed CRLs by distribution point URL and reuse each for up to an hour, or until its NextUpdate if that comes first. An hour is the HTTP max-age Let's Encrypt serves on its root CRL. A CRL is cached only after its signature verifies, every use still re-verifies it against the probing leaf's issuer (the cache is keyed by URL alone), and a CRL without a NextUpdate is never cached since it declares no validity window. Concurrent probes fetch through singleflight.DoChanContext to avoid re-fetching a single CRL, with each waiter keeping its own deadline. A caller that missed the cache re-checks it inside the singleflight closure, since singleflight dedupes only calls that overlap. Leaf certificates whose issuer is missing from the presented chain now fail before any fetch. Previously the probe downloaded the CRL and then panicked in CheckSignatureFrom, which the prober recovered and recorded as a probe failure. Also update the TLS probe's doc comments, which said OCSP where the code checks a CRL. Fixes #21310 Signed-off-by: Thomas Desrosiers <git@hive.pw>
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.