1 year ago

Presented by Jason A Donenfeld FOSDEM 2017


Cryptokey Routing Server

Cryptokey Routing Server Config [Interface] PrivateKey = yAnz5TF+lXXJte14tji3zlMNq+hd2rYU IgJBgB3fBmk= ListenPort = 41414 [Peer] PublicKey = xTIBA5rboUvnH4htodjb6e697QjLERt1 NAB4mZqp8Dg= AllowedIPs =, Client Config [Interface] PrivateKey = gI6EdUSYvn8ugXOt8QQD6Yc+JyiZxIhp 3GInSWRfWGE= ListenPort = 21841 [Peer] PublicKey = HIgo9xNzJMWLKASShiTqIybxZ0U3wGLi UeJ1PKf8ykw= Endpoint = AllowedIPs = [Peer] PublicKey = TrMvSoP4jYQlY6RIzBgbssQqY3vxI2Pi +y71lOWWXX0= AllowedIPs =,

Cryptokey Routing User space send()s packet. Ordinary Linux routing table decides to give it to wg0. WireGuard inspects the destination IP address of the packet to determine which peer it’s for. The packet is encrypted with that peer’s session keys, and sent to the peer’s endpoint. WireGuard UDP socket recv()s encrypted packet. It decrypts this packet, and in doing so learns which peer it’s from. WireGuard inspects the source IP of the decrypted packet, and sees if this actually corresponds with the peer who sent it. If it corresponds, the packet is allowed; otherwise it’s dropped.

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