2 Commits

Author	SHA1	Message	Date
Mike O'Driscoll	e72c528a5f	cmd/{derp,derpprobe},prober,derp: add mesh support to derpprobe (#15414) ... Add mesh key support to derpprobe for probing derpers with verify set to true. Move MeshKey checking to central point for code reuse. Fix a bad error fmt msg. Fixes tailscale/corp#27294 Fixes tailscale/corp#25756 Signed-off-by: Mike O'Driscoll <mikeo@tailscale.com>	2025-06-10 15:29:42 -04:00
Simon Law	3ee4c60ff0	cmd/derper: fix mesh auth for DERP servers (#16061) ... To authenticate mesh keys, the DERP servers used a simple == comparison, which is susceptible to a side channel timing attack. By extracting the mesh key for a DERP server, an attacker could DoS it by forcing disconnects using derp.Client.ClosePeer. They could also enumerate the public Wireguard keys, IP addresses and ports for nodes connected to that DERP server. DERP servers configured without mesh keys deny all such requests. This patch also extracts the mesh key logic into key.DERPMesh, to prevent this from happening again. Security bulletin: https://tailscale.com/security-bulletins#ts-2025-003 Fixes tailscale/corp#28720 Signed-off-by: Simon Law <sfllaw@tailscale.com>	2025-05-22 12:14:16 -07:00