Mac OS X Hints - Replace the built-in FTP server

Apple's built-in FTP server, which is started by clicking a button in the Sharing prefs panel, is probably sufficient for most users. It gives easy access to your machine via FTP, but has some limitations. If you wish to allow others to FTP to your machine, you need to create an OS X account for each user. If you want those users restricted to their home directory, you need to create an 'ftpchroot' file that limits their access. Other more advanced tasks, such as space limitations, require further tweaking to the FTP server.