A security administrator needs to address the following audit recommendations for a public-facing SFTP server: Users should be restricted to upload and download files to their own home directories onl

PermitTunnel controls whether TUN/TAP device forwarding is allowed for VPN-like tunneling, which is unrelated to restricting users to home directories or preventing interactive shell access.

ChrootDirectory in sshd_config jails SFTP users to a specified directory (typically their home directory), preventing them from traversing the filesystem outside that path. When combined with the internal-sftp subsystem, it ensures users can only upload and download files within their designated chroot environment.

PermitTTY, when set to 'no' in sshd_config, prevents the allocation of a pseudo-terminal (TTY) for the session, which effectively blocks users from obtaining an interactive shell login while still allowing SFTP file transfer operations to proceed.

AllowTcpForwarding controls whether TCP port forwarding is permitted through the SSH connection, which addresses tunneling security but does not restrict directory access or prevent interactive shell logins.

IgnoreRhosts controls whether .rhosts and .shosts files are used for authentication, which is a legacy authentication hardening measure and has no effect on directory restrictions or interactive shell access.