remoteu2f is a project that enables the use of a FIDO U2F security key remotely, through a lightly-trusted proxy.

It is useful mainly to use as a second factor authentication for ssh and sudo-over-ssh. For example:

• User does "ssh server", and enters their password.
• Server shows a one-time randomly generated URL.
• User visits the URL, and inserts/touches the security key.
• The SSH server allows access.

It is written in Go, with some C for PAM integration.

For how to install and use it, please see the installation instructions.

If you want to report bugs, send patches, or have any questions or comments, just let me know at albertito@blitiri.com.ar.