community.aegirproject.org

Cafuego has written an excellent article that explains how to hook up PureFTPd and PAM on your Linux server, so that you can authenticate your clients via the Aegir database and have them FTP into your server and be chrooted (locked) into just seeing their sites.

Read the article here.

Adam has adapted the FTP group to work with SFTP/SSH logins using OpenSSH and MySecureShell.