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Vsftpd - un serveur ftp sous linux

Exemples de fichiers de configuration vsftpd

Redhat

Pour gérer la base: db_load -T -t hash -f /etc/vsftpd.txt /etc/vsftpd_login.d
Format fichier vsftpd.txt
user
password

Debian

exemple entrée xinetd.conf pour vsftpd
service ftp
{
 id = ftp
 protocol = tcp
# disable = no
 socket_type = stream
 wait = no
 user = root
 server = /usr/sbin/vsftpd
 per_source = 2 
 instances = 10
 nice = 10
 log_on_success += PID HOST DURATION
 log_on_failure += HOST
 #log_on_success += DURATION USERID
 #log_on_failure += USERID
# banner = /etc/banner.msg
}
Fichiers de conf vsftpd :
# Example config file /etc/vsftpd.conf

# The default compiled in settings are very paranoid. This sample file
# loosens things up a bit, to make the ftp daemon more usable.

# Allow anonymous FTP?
anonymous_enable=NO
#
# Uncomment this to allow local users to log in.
local_enable=YES

# Uncomment this to enable any form of FTP write command.
write_enable=YES
#
# Default umask for local users is 077. You may wish to change this to 022,
# if your users expect that (022 is used by most other ftpd's)
local_umask=022

# Uncomment this to allow the anonymous FTP user to upload files. This only
# has an effect if the above global write enable is activated. Also, you will
# obviously need to create a directory writable by the FTP user.
anon_upload_enable=NO
#
# Uncomment this if you want the anonymous FTP user to be able to create
# new directories.
anon_mkdir_write_enable=NO

# Activate directory messages - messages given to remote users when they
# go into a certain directory.
dirmessage_enable=YES
#
# Activate logging of uploads/downloads.
xferlog_enable=YES
#
# Make sure PORT transfer connections originate from port 20 (ftp-data).
connect_from_port_20=YES

# If you want, you can arrange for uploaded anonymous files to be owned by
# a different user. Note! Using "root" for uploaded files is not
# recommended!
#chown_uploads=YES
#chown_username=whoever

# You may override where the log file goes if you like. The default is shown
# below.
xferlog_file=/var/log/vsftpd.log

# If you want, you can have your log file in standard ftpd xferlog format
xferlog_std_format=YES

# You may change the default value for timing out an idle session.
idle_session_timeout=600

# You may change the default value for timing out a data connection.
data_connection_timeout=120

# It is recommended that you define on your system a unique user which the
# ftp server can use as a totally isolated and unprivileged user.
nopriv_user=ftpsite

# Enable this and the server will recognise asynchronous ABOR requests. Not
# recommended for security (the code is non-trivial). Not enabling it,
# however, may confuse older FTP clients.
async_abor_enable=NO

# By default the server will pretend to allow ASCII mode but in fact ignore
# the request. Turn on the below options to have the server actually do ASCII
# mangling on files when in ASCII mode.
# Beware that turning on ascii_download_enable enables malicious remote parties
# to consume your I/O resources, by issuing the command "SIZE /big/file" in
# ASCII mode.
# These ASCII options are split into upload and download because you may wish
# to enable ASCII uploads (to prevent uploaded scripts etc. from breaking),
# without the DoS risk of SIZE and ASCII downloads. ASCII mangling should be
# on the client anyway..
ascii_upload_enable=YES
ascii_download_enable=YES

# You may fully customise the login banner string:
ftpd_banner=Welcome to Malek FTP service.

# You may specify a file of disallowed anonymous e-mail addresses. Apparently
# useful for combatting certain DoS attacks.
#deny_email_enable=YES
# (default follows)
#banned_email_file=/etc/vsftpd.banned_emails

# You may specify an explicit list of local users to chroot() to their home
# directory. If chroot_local_user is YES, then this list becomes a list of
# users to NOT chroot().
chroot_list_enable=YES
# (default follows)
chroot_list_file=/etc/vsftpd.chroot_list

# You may activate the "-R" option to the builtin ls. This is disabled by
# default to avoid remote users being able to cause excessive I/O on large
# sites. However, some broken FTP clients such as "ncftp" and "mirror" assume
# the presence of the "-R" option, so there is a strong case for enabling it.
anon_other_write_enable=NO
chroot_local_user=YES
#guest_enable=YES
#guest_username=ftpsite
#anon_max_rate=200000
#local_max_rate=200000


Important : Lorsque vous ajouez un utilisateur système pour qu'il ait accès au FTP. Ne lui mettez pas le shell /bin/bash ( par défaut ). Car sinon ce dernier pourra se connecter en ssh sur la machine.
Lorsque vous ajoutez votre utilisateur via adduser, utilisez l'option --shell /bin/false pour spécifier le shell
(une entrée /bin/false doit exister dans /etc/shell sinon l'utilisateur obtiendra une erreur à la connexion)

Exemple de fichier PAM dans le cas, d'utilisateur virtuel :
auth sufficient pam_unix.so
account sufficient pam_unix.so
auth required /lib/security/pam_userdb.so db=/etc/vsftpd
account required /lib/security/pam_userdb.so db=/etc/vsftpd

Pour gérer la base : db3_load -T -t hash -f /etc/vsftpd.txt /etc/vsftpd.db
How-to vsftpd

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