Authenticating with U2F
by Sven Vermeulen, post on Mon 11 September 2017In order to further secure access to my workstation, after the switch to Gentoo sources, I now enabled two-factor authentication through my Yubico U2F USB device. Well, at least for local access - remote access through SSH requires both userid/password as well as the correct SSH key, by chaining authentication methods in OpenSSH.
Enabling U2F on (Gentoo) Linux is fairly easy. The various guides online which talk
about the pam_u2f setup are indeed correct that it is fairly simple. For completeness
sake, I've documented what I know on the Gentoo Wiki, as the pam_u2f article.