Provide an option to turn off FTP anonymous usage

[joyul_juniper.net]

Summary

ftpd provides the -n option to disable anonymous FTP access, meaning the username 'ftp' cannot log in to the FTP server without a password stored in the password database. This feature helps prevent users who lack the background knowledge of how this special username 'ftp' conventionally works in FTP from mistakenly creating an account with the username 'ftp,' assuming it behaves like other usernames that require a password to log in to the FTP server, which it does not.

Test Plan

Test steps:

1. Create an "ftp" username account.
2. Start ftpd with the -n option.
3. Make sure the username 'ftp' can only log in when the password stored in the database is provided.

[des]

libexec/ftpd/ftpd.8

28

Bump

libexec/ftpd/ftpd.c

295

Please keep options sorted in alphabetical order.

[des]

libexec/ftpd/ftpd.8

28

Still needs bumping.

[joyul_juniper.net]

Updated patch to D46547

[des]

Sorry, I lost track of this.

libexec/ftpd/ftpd.8

37