Fernando Serboncini 5edfa6f9a8 ipn/ipnlocal: add wildcard TLS certificate support for subdomains (#18356)
When the NodeAttrDNSSubdomainResolve capability is present, enable
wildcard certificate issuance to cover all single-level subdomains
of a node's CertDomain.

Without the capability, only exact CertDomain matches are allowed,
so node.ts.net yields a cert for node.ts.net. With the capability,
we now generate wildcard certificates. Wildcard certs include both
the wildcard and base domain in their SANs, and ACME authorization
requests both identifiers. The cert filenames are kept still based
on the base domain with the wildcard prefix stripped, so we aren't
creating separate files. DNS challenges still used the base domain

The checkCertDomain function is replaced by resolveCertDomain that
both validates and returns the appropriate cert domain to request.
Name validation is now moved earlier into GetCertPEMWithValidity()

Fixes #1196

Signed-off-by: Fernando Serboncini <fserb@tailscale.com>
2026-02-03 16:08:36 -05:00
2026-01-29 09:35:21 -08:00
2026-01-27 16:15:17 -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 1.25. (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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