Brad Fitzpatrick
cbcca9dc15
The per-client receive rate limiter charges at most minRateLimitTokenBucketSize tokens per frame, on the assumption that any frame larger than that would fail validation and close the connection. That held for every known frame type, but not for unknown ones: handleUnknownFrame discarded exactly the declared length, up to 4 GiB, and returned nil, keeping the connection open. A client could therefore send unknown frame types with huge declared lengths and have the server read the bytes off the socket while being charged only 64 KiB of tokens per frame, bypassing the operator's configured per-client rate limit by a factor of about 65,000. Reject unknown frames whose declared length exceeds the largest frame a regular client can send today, which makes the limiter's assumption true for all frame types while still tolerating small, reasonably sized frames from newer clients. Add a test that the server still tolerates a small unknown frame and closes the connection on a huge one. Fixes tailscale/corp#48889 Updates tailscale/corp#40171 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> Change-Id: I3f6a2c9d8e1b4a7f5c0d2e9b8a6f4c1d7e3b5a90
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.