I wrote a Sinatra app to act as a Google Authenticator backend for our FreeRADIUS instance as well as our web SSO. It also handles enrollment via generating QR

I wrote a Sinatra app to act as a Google Authenticator backend for our FreeRADIUS instance as well as our web SSO. It also handles enrollment via generating QR codes: http://it.isevil.org/blog/2011/11/13/authentication-service-using-google-authenticator/ http://it.isevil.org/blog/2011/11/13/authentication-service-... Code: https://github.com/bithive/example-totp-vault https://github.com/bithive/example-totp-vault For FreeRADIUS we use rlm_perl to define our own authenticate() method; it just calls the web service to validate the codes.