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Old 02-17-2005, 06:21 AM   #1
Mojosue
LQ Newbie
 
Registered: May 2004
Posts: 12

Rep: Reputation: 0
Vsftp


HI...

I got myself in a pickle looking on the web for how to restrict access for FTP users. Some people say chroot users, then something about list of users that cannot use ftp, then one file said about chroot-users = yes.. but then add a vsftpd.chroot.users with accepted users, but I wasnt sure where to put that file

anyway heres where I am

Linux Red Hat RE 3

VSFTPD which appears to be located in /etc/vsftpd/

in the .etc directory I have
vsftpd.ftpusers and vsftpd.user_list (whatever the difference is between them I havent a clue)

Anyway, so, I have a user on this Linux machine called say
Bob - and I want Bob to FTP to this machine into his Home Directory - which is set in Users I believe. I am happy for Bob to make some more directories for himself there, but dont want him escaping out into other place.


So, in like really simple step my step terms can you tell me
a) how to modify my vsftpd.conf file
b) if I should create a chroot file and put it where? (carefull now) and what is should look like?




conf below...


# Example config file /etc/vsftpd.conf
#
# The default compiled in settings are fairly paranoid. This sample file
# loosens things up a bit, to make the ftp daemon more usable.
# Please see vsftpd.conf.5 for all compiled in defaults.
#
# READ THIS: This example file is NOT an exhaustive list of vsftpd options.
# Please read the vsftpd.conf.5 manual page to get a full idea of vsftpd's
# capabilities.
#
# Allow anonymous FTP? (Beware - allowed by default if you comment this out).
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=YES
#
# Uncomment this if you want the anonymous FTP user to be able to create
# new directories.
#anon_mkdir_write_enable=YES
#
# 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=ftpsecure
#
# 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=YES
#
# 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 the Data Design 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.
#ls_recurse_enable=YES
pam_service_name=vsftpd
userlist_enable=YES
#enable for standalone mode
listen=YES
tcp_wrappers=YES
 
Old 02-17-2005, 10:44 AM   #2
skunkburner
Member
 
Registered: Mar 2004
Distribution: Fedora Core 17 & 18, Debian Wheezy
Posts: 137

Rep: Reputation: 16
chroot_list_enable=YES
chroot_list_file=/etc/vsftpd/vsftpd.chroot_list

If you add the above lines to your vsftpd.conf by default users will not be chroot'd
Add the user you want chrooting to vsftpd.chroot_list


vsftpd.chroot_list should look like a list of names

fred
bob
etc......

Last edited by skunkburner; 02-18-2005 at 08:09 AM.
 
Old 02-18-2005, 06:02 AM   #3
Mojosue
LQ Newbie
 
Registered: May 2004
Posts: 12

Original Poster
Rep: Reputation: 0
what does it mean if the chroot list file entry highlights in brown???
 
Old 02-18-2005, 06:20 AM   #4
Mojosue
LQ Newbie
 
Registered: May 2004
Posts: 12

Original Poster
Rep: Reputation: 0
whatever it means it works! Fantastic

so I have set it so only local users can ftp to it, and then they can only browse their home directories.
Sorted.

easy when you know how huh!


back to Samba Shares now then..
 
  


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