BrianzaLand Blog

Di seguito riporto il file di configurazione del server FTP "ProFTPD" a me ideale: 

# /etc/proftpd/proftpd.conf — This is a basic ProFTPD configuration file.
# To really apply changes reload proftpd after modifications.

# Includes DSO modules
Include /etc/proftpd/modules.conf

# Set off to disable IPv6 support which is annoying on IPv4 only boxes.
UseIPv6    off

ServerName   "Debian"
ServerType   standalone
DeferWelcome   off

MultilineRFC2228  on
DefaultServer   on
ShowSymlinks   on

TimeoutNoTransfer  600
TimeoutStalled   600
TimeoutIdle   1200

DisplayLogin                    welcome.msg
DisplayFirstChdir               .message
ListOptions                 "-l"

DenyFilter   \*.*/

# Port 21 is the standard FTP port.
Port    21

# PassivePorts                    49152 65534

# To prevent DoS attacks, set the maximum number of child processes
# to 30. Note that this ONLY works
# in standalone mode, in inetd mode you should use an inetd server
# that allows you to limit maximum number of processes per service
# (such as xinetd)
MaxInstances   30

# Set the user and group that the server normally runs at.
User    proftpd
Group    ftp

DefaultRoot ~

# Umask 022 is a good standard umask to prevent new files and dirs
# (second parm) from being group and world writable.
Umask    022  022
# Normally, we want files to be overwriteable.
AllowOverwrite   on

# PersistentPasswd  off

# Be warned: use of this directive impacts CPU average load!
# Uncomment this if you like to see progress and transfer rate with ftpwho
# in downloads. That is not needed for uploads rates.
# UseSendFile   off

TransferLog /var/log/proftpd/xferlog
SystemLog   /var/log/proftpd/proftpd.log

<IfModule mod_tls.c>
TLSEngine off
</IfModule>

<IfModule mod_quota.c>
QuotaEngine on
</IfModule>

<IfModule mod_ratio.c>
Ratios on
</IfModule>

# Delay engine reduces impact of the so-called Timing Attack described in
# http://security.lss.hr/index.php?page=details&ID=LSS-2004-10-02
# It is on by default.
<IfModule mod_delay.c>
DelayEngine on
</IfModule>

<IfModule mod_ctrls.c>
ControlsEngine        on
ControlsMaxClients    2
ControlsLog           /var/log/proftpd/controls.log
ControlsInterval      5
ControlsSocket        /var/run/proftpd/proftpd.sock
</IfModule>

<IfModule mod_ctrls_admin.c>
AdminControlsEngine on
</IfModule>

# A basic anonymous configuration, no upload directories.

# <Anonymous ~ftp>
#   User    ftp
#   Group    nogroup
#   # We want clients to be able to login with "anonymous" as well as "ftp"
#   UserAlias   anonymous ftp
#   # Cosmetic changes, all files belongs to ftp user
#   DirFakeUser on ftp
#   DirFakeGroup on ftp
#
#   RequireValidShell  off
#
#   # Limit the maximum number of anonymous logins
#   MaxClients   10
#
#   # We want 'welcome.msg' displayed at login, and '.message' displayed
#   # in each newly chdired directory.
#   DisplayLogin   welcome.msg
#   DisplayFirstChdir  .message
#
#   # Limit WRITE everywhere in the anonymous chroot
#   <Directory *>
#     <Limit WRITE>
#       DenyAll
#     </Limit>
#   </Directory>
#
#   # Uncomment this if you're brave.
#   # <Directory incoming>
#   #   # Umask 022 is a good standard umask to prevent new files and dirs
#   #   # (second parm) from being group and world writable.
#   #   Umask    022  022
#   #            <Limit READ WRITE>
#   #            DenyAll
#   #            </Limit>
#   #            <Limit STOR>
#   #            AllowAll
#   #            </Limit>
#   # </Directory>
#
# </Anonymous>

In definitiva è il file di configurazione originale installando proftpd via apt-get con qualche piccola modifica per adattarlo alle mie esigenze. Una di queste è la direttiva DefaultRoot ~ che consente di vincolare l'accesso FTP degli utenti alla sola cartella (e sottocartelle) a loro assegnata di default.