c91b7188e8
serveDebugDERPRegion built its TLS config with ServerName: cmp.Or(derpNode.CertName, derpNode.HostName), which for a "sha256-raw:<hex>" CertName passed the raw fingerprint to Go's stock verifier as a hostname; the handshake always failed with a hostname mismatch. This is the second half of #15579; the first half (tailscaled itself failing with "unexpected multiple certs presented") was fixed in Extract a tlsConfigForNode helper that mirrors derphttp.Client.tlsClient so that sha256-raw and domain-fronting CertName values are dispatched to tlsdial.SetConfigExpectedCertHash and tlsdial.SetConfigExpectedCert respectively, falling back to HostName when CertName is empty. The core fix here was originally written by @imnuke in #19965; that PR also added a unit test in ipn/localapi/debugderp_test.go which is replaced in this commit by a new vmtest that exercises the whole stack: vnet now serves a self-signed cert valid for each fake DERP node's HostName and exposes its SHA-256 fingerprint, and vmtest grows a new SelfSignedDERPCertPinning EnvOption that swaps the test DERP map's nodes to CertName="sha256-raw:<hex>" with InsecureForTests cleared. TestSelfSignedDERPHashPinning then stands up two hard-NAT'd nodes, has them communicate over DERP, and calls DebugDERPRegion on each. Before this fix the test fails with the exact x509 hostname-mismatch error from the original bug; after, it passes. Updates #15579 Change-Id: I61f38ffebc7ac5abc962639db1ae88f5cd8633b1 Co-authored-by: Nuke <nuke@imnuke.dev> Signed-off-by: Brad Fitzpatrick <bradfitz@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 1.26. (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:
- 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.