Bonjour à tous,

J'ai installé un serveur Proftpd (connexion en SFTP) sur un Debian et j'ai quelques soucis. Tout d'abord, j'ai besoin d'enfermer les utilisateurs dans leur home afin qu'ils ne puissent pas remonter à la racine et accéder à des répertoires sensibles. En faisant des recherches, j'ai bien compris que c'était l'objectif du mais chez moi ça ne marche pas vraiment. En fait, l'utilisateur est bien dans son home dès la connexion, mais il peut très bien remonter a grands coups de "cd .." ou même en tapant "cd /". J'aimerais savoir si vous avez une idée de pourquoi chez moi ça ne marche pas alors que ça a l'air de fonctionner chez les autres. Voici mon fichier de config :
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#
# /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                on
# If set on you can experience a longer connection delay in many cases.
IdentLookups            off
 
ServerName            "Debian"
ServerType            standalone
DeferWelcome            off
 
MultilineRFC2228        on
DefaultServer            on
ShowSymlinks            on
 
TimeoutNoTransfer        600
TimeoutStalled            600
TimeoutIdle            1200
 
DisplayLogin                    welcome.msg
DisplayChdir                   .message true
ListOptions                    "-l"
 
DenyFilter            \*.*/
 
# Use this to jail all users in their homes 
 
DefaultRoot            ~
 
# Users require a valid shell listed in /etc/shells to login.
# Use this directive to release that constrain.
RequireValidShell        off
 
# Port 21 is the standard FTP port.
Port                21
 
# In some cases you have to specify passive ports range to by-pass
# firewall limitations. Ephemeral ports can be used for that, but
# feel free to use a more narrow range.
# PassivePorts                  49152 65534
 
# If your host was NATted, this option is useful in order to
# allow passive tranfers to work. You have to use your public
# address and opening the passive ports used on your firewall as well.
# MasqueradeAddress        1.2.3.4
 
# This is useful for masquerading address with dynamic IPs:
# refresh any configured MasqueradeAddress directives every 8 hours
<IfModule mod_dynmasq.c>
# DynMasqRefresh 28800
</IfModule>
 
# To prevent DoS attacks, set the maximum number of child processes
# to 30.  If you need to allow more than 30 concurrent connections
# at once, simply increase this value.  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                nogroup
 
# 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
 
# Uncomment this if you are using NIS or LDAP via NSS to retrieve passwords:
# PersistentPasswd        off
 
# This is required to use both PAM-based authentication and local passwords
AuthOrder            mod_auth_unix.c
 
# 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_quotatab.c>
QuotaEngine off
</IfModule>
 
<IfModule mod_ratio.c>
Ratios off
</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        off
ControlsMaxClients    2
ControlsLog           /var/log/proftpd/controls.log
ControlsInterval      5
ControlsSocket        /var/run/proftpd/proftpd.sock
</IfModule>
 
<IfModule mod_ctrls_admin.c>
AdminControlsEngine off
</IfModule>
 
#
# Alternative authentication frameworks
#
#Include /etc/proftpd/ldap.conf
#Include /etc/proftpd/sql.conf
 
#
# This is used for FTPS connections
#
Include /etc/proftpd/tls.conf
 
# 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
#   DisplayChdir        .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>
Par ailleurs, si vous voyez des choses à améliorer, je prends tous les conseils. Mais pour l'heure, j'aimerais bien que les utilisateurs soient complètement enfermés dans leur home.

Merci d'avance.

Naoki