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Next we have to create a new SSH key-pair which can be either an ecdsa-sk or an ed25519-sk key-pair. Ubuntuu 22.04 as our client machine and OpenBSD 8.9 as our Bastion server for this tutorial: $ lsb_release -d & ssh -V First we need to make sure the client has OpenSSH 8.2 or higher installed. This setup is shown in diagramĭiagram 1: Bastion host with OpenSSH YubiKey U2F Authentication New SSH key-pair

Known as stepping stone servers that connect to your VPC (Virtual Private Cloud). The private SSH key, which is normally on your SSD or cloud instance, shouldīe useless to a malicious user who does not have access to the physical YubiKey on which the second private key isĬonfiguring 2FA (Two Factor Authentication) with YubiKeys on SSH sessions is ideal for bastion hosts, also This means you have to explicitly authorize a new

YubiKeys are hardware security keys that provide One Time Pads (OTP), namely U2F (Universal 2nd Factor)Ĭryptographic tokens through a USB and/or NFC interface. Now supports FIDO (Fast Identity Online) U2F security keys. Security Keys U2F Authentication on Ubuntu Cryptsus Blog | We craft cyber security solutions.