proftpd-mod_auth_otp
The mod_auth_otp
module for ProFTPD supports one-time passwords (via the
HOTP/TOTP algorithms) for both FTP and SFTP connections. This include Google
Authenticator support, for example.
See the mod_auth_otp.html documentation for more details.
Important: The mod_auth_otp
module is now distributed with the ProFTPD
source code; this repo is now archived.