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5.6.3. User Accounts
Because FTP passes unencrypted usernames and passwords over insecure networks for authentication, it is a good idea to deny system users access to the server from their user accounts.
To disable user accounts in
vsftpd, add the following directive to /etc/vsftpd/vsftpd.conf:
local_enable=NO 5.6.3.1. Restricting User Accounts
The easiest way to disable a specific group of accounts, such as the root user and those with
sudo privileges, from accessing an FTP server is to use a PAM list file as described in Section 4.4.1, “Allowing Root Access”. The PAM configuration file for vsftpd is /etc/pam.d/vsftpd.
It is also possible to disable user accounts within each service directly.
To disable specific user accounts in
vsftpd, add the username to /etc/vsftpd.ftpusers.
