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The Yubico libsk-libfido2.so middleware library must be present on the Next we create a new SSH-keypair generated on the Ubuntu 18.04 client host. SoloKeys are based on open-source hardware and firmware while YubiKey's are closed source. Make sure to check out SoloKeys if you did not yet purchase $ lsusb -v 2>/dev/null | grep -A2 Yubico | grep "bcdDevice" | awk '' Yubico does not permit its firmware toīe altered in order to minimize the physical attack surface. We can check the firmware version of a YubiKey with the following command. If possible, generate an ed25519-sk SSH key-pair This means YubiKeys with firmware below 5.2.3 are only compatible with ecdsa-sk key-pairs.

That an ed25519-sk key-pair is only supported by new YubiKeys with firmware 5.2.3 or The sk extension stands for security key. 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.