authentication

Adding Yubikey 2-factor authentication to SSH and sudo in Debian

Throughout 2014 and 2015 I have been adding two-factor authentication to Debian and Ubuntu servers (SSH, sudo) for some of my customers, using Yubikeys as the authentication device and OTP as the auth method. It's quite straightforward to integrate Yubikey OTP auth into Debian SSH servers, provided you are using Debian 7 (Wheezy) or higher, and that you can use the version of OpenSSH from the Backports repository.

This guide will work for SSH auth, as well as for other server-side tasks such as the use of sudo.

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