5384d23690
LetsEncrypt made certificates for bare IP addresses generally available in January 2026. They require the short-lived ACME certificate profile and are valid for about six days. Add a new --acme-ip-certs flag. When set (with the default --certmode=letsencrypt), connections that arrive by IP address (no TLS SNI, or an IP address SNI matching the connection's destination address) get a LetsEncrypt cert for that IP, obtained on demand using the "shortlived" profile and the HTTP-01 challenge served on derper's plaintext HTTP port. Because the certificate is requested for whatever address the connection actually arrived on, it works for both IPv4 and IPv6 with no per-address configuration, and a client can never make us request a certificate for an address that isn't ours. Connections with a DNS name in the SNI keep using the regular autocert manager for --hostname. autocert can't do any of this itself, as it neither orders IP address identifiers nor serves connections without SNI, so this adds a small dedicated cert manager using tailscale.com/tempfork/acme instead. Clients can then connect to https://<IP> without the DERPMap CertName pinning that self-signed certs from --certmode=manual require. Updates tailscale/corp#45167 Updates #11776 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> Change-Id: I8e2d5b0a7c4f9e1b3d6a8c2f5e0b9d4a7c1f3e6d
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.