vsftpd problem

sco1984 · 11-11-2008, 04:00 AM

Hello,

I Googled a lot for vsftpd but I found no solution for my problem.
I have OpenSuSe 10.3 x86 version installed.
I have enabled vsftpd from network services.
As of now FTP is accesible from outside world.
I create new users and make them FTP user.
Problem is users are able to browse system folders.
I want users to see only there /home dir when they log in to FTP.
How can I restrict user's from being able to see other dir's?

Regards,
Amey.

sleddog · 11-11-2008, 04:11 AM

You want to 'chroot' users to their home directory, so add the following to the vsftpd.conf file (it may be located in /etc/vsftpd/):

Code:

chroot_local_user=YES

The complete list of vsftpd configuration options are in a man page. At a command prompt use:

Code:

man vsftpd.conf

farrukhndm · 11-11-2008, 04:17 AM

hi,
open vsftpd.conf and find
chroot_local_user=??? -> change to chroot_local_user=yes

it wil solve to move the users other directories of your / and it will secure it.

thanks.

sco1984 · 11-11-2008, 05:08 AM

Thanks to both of you for quick reply.
I verified that chroot_local_user = YES command is there.
I have also created vsftpd.chroot_list txt and added 1 user in it.
restarted vsftps service from konsole.

Checked by connecting using File Zilla FTP client but still that user can see all system folder's.
Whats wrong with my config?

I see local_root=/srv/ftp command at the end of vsftpd.conf file. Shall I change the path to /home ?

UPDATE Issue solved

I didn't make change in chroot_local_user file which is located at bottom side in the vsftpd.conffile.

I was trying to configure above file in description tab. Silly me.
I read whole vsftpd.conf file by taking print out of it.
And I realized I must edit chroot_local_user in the ACL's which are available when we scroll the config file 100%
It's working now.
I have changed local_path from srv_ftp to /home

Thanks for help!

sco1984 · 11-11-2008, 10:35 AM

Now 1 problem still with me.
I have changed local_path to /home
I dont want users to exaplorer each others profile.
For that restriction what should I do?
Currently user's only see /home dir but all users under /home and there dir's are visible.
Any hint?

Thanks,
AMey.

sco1984 · 11-12-2008, 05:52 AM

Anybody can help me with security boundaries for vsftpd ?

Koushik Biswas · 11-12-2008, 07:11 AM

Hi ,

you need to edit /etc/vsftpd/vsftpd.conf
and add 3 lines.
chroot_local_user=YES
chroot_list_enable=YES
chroot_list_file=/etc/vsftpd.chroot_list

now create blank vsftpd.chroot_list inside /etc directory with -rw-r--r-- permission.

e.g:- cd /etc
touch vsftpd.chroot_list

Hope it will help you.

Best of luck ......

Regards
KB

sco1984 · 11-12-2008, 07:55 AM

Quote:

Originally Posted by Koushik Biswas

Hi ,

you need to edit /etc/vsftpd/vsftpd.conf
and add 3 lines.
chroot_local_user=YES
chroot_list_enable=YES
chroot_list_file=/etc/vsftpd.chroot_list

now create blank vsftpd.chroot_list inside /etc directory with -rw-r--r-- permission.

e.g:- cd /etc
touch vsftpd.chroot_list

Hope it will help you.

Best of luck ......

Regards
KB

I did that yesterday only.
Whats next?
If I log in using ftp user, he can still see rest user's names in /home dir and he can explorer and can read file names how ever downloading operation failed.

I dont want user to be able to see other folder than his /home profile and empty space.

What should I do to enable that security option?

Regards,
Amey.

koflanagan · 11-12-2008, 04:58 PM

I think your problem is the /home. The reason I say that is you previously said "I have changed local_path to /home". So you are seeing what you are supposed to, but nto what you want. Have you tried setting local_path to /home/$USER ?

sco1984 · 11-13-2008, 01:20 AM

Quote:

Originally Posted by koflanagan

I think your problem is the /home. The reason I say that is you previously said "I have changed local_path to /home". So you are seeing what you are supposed to, but nto what you want. Have you tried setting local_path to /home/$USER ?

Thanks for quick reply.
I tried to put /home/$USER in vsftpd.conf and restarted vsftpd server.
Tried to connect using client.
It's throwing following error message > 500 OOPS: cannot change directory:/home/$USER

Any other way?

Regards,
Amey.

ChrisAbela · 11-13-2008, 01:59 AM

Quote:

chroot_local_user=YES
chroot_list_enable=YES

These two lines are conflicting. I would remove the second one and leave the first one.

Then make sure that /etc/vsftps.chroot_list is empty - to start with, as this only works with a valid chroot() directory
Then comment out the local_root line.
It WILL work, but just incase it does not, I am posting my /etc/vsftpd.conf:

Quote:

# 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 on some FTP servers, ASCII support allows a denial of service
# attack (DoS) via the command "SIZE /big/file" in ASCII mode. vsftpd
# predicted this attack and has always been safe, reporting the size of the
# raw file.
# ASCII mangling is a horrible feature of the protocol.
ascii_upload_enable=YES
ascii_download_enable=YES
#
# You may fully customise the login banner string:
ftpd_banner=Welcome to DARKSTAR 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

# Chris inserted the following three lines. Note that the local_root is
# important as otherwise the /etc/vfstpd.chroot_list is ignored
chroot_local_user=YES
# local_root=/home

# (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
#
# To run vsftpd in standalone mode (rather than through inetd), uncomment
# the line below.
#listen=YES

sco1984 · 11-13-2008, 02:22 AM

Quote:

# 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.
#
# If you do not change anything here you will have a minimum setup for an
# anonymus FTP server.
#
# 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.

# General Settings
#
# Uncomment this to enable any form of FTP write command.
#
#write_enable=YES
#
# Activate directory messages - messages given to remote users when they
# go into a certain directory.
#
dirmessage_enable=YES
#
# 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
#
# You may fully customise the login banner string:
#
#ftpd_banner="Welcome to FOOBAR FTP service."
#
# 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
#
# 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
#
# If enabled, all user and group information in
# directory listings will be displayed as "ftp".
#
#hide_ids=YES

# Local FTP user Settings
#
# Uncomment this to allow local users to log in.
#
#local_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 to put local users in a chroot() jail in their home directory
# after login.
#
#chroot_local_user=YES
#
# 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().
#
#
# (default follows)
#
#chroot_list_file=/etc/vsftpd.chroot_list
#
# The maximum data transfer rate permitted, in bytes per second, for
# local authenticated users. The default is 0 (unlimited).
#
#local_max_rate=7200

# Anonymus FTP user Settings
#
# Allow anonymous FTP?
#
anonymous_enable=NO
#
# Anonymous users will only be allowed to download files which are
# world readable.
#
anon_world_readable_only=YES
#
# 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
#
# Default umask for anonymus users is 077. You may wish to change this to 022,
# if your users expect that (022 is used by most other ftpd's)
#
#anon_umask=022
#
# Uncomment this if you want the anonymous FTP user to be able to create
# new directories.
#
#anon_mkdir_write_enable=YES
#
# Uncomment this to enable anonymus FTP users to perform other write operations
# like deletion and renaming.
#
#anon_other_write_enable=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
#
# The maximum data transfer rate permitted, in bytes per second, for anonymous
# authenticated users. The default is 0 (unlimited).
#
#anon_max_rate=7200

# Log Settings
#
# Log to the syslog daemon instead of using an logfile.
#
syslog_enable=YES
#
# Uncomment this to log all FTP requests and responses.
#
#log_ftp_protocol=YES
#
# Activate logging of uploads/downloads.
#
#xferlog_enable=YES
#
# You may override where the log file goes if you like. The default is shown
# below.
#
#vsftpd_log_file=/var/log/vsftpd.log
#
# If you want, you can have your log file in standard ftpd xferlog format.
# Note: This disables the normal logging unless you enable dual_log_enable below.
#
#xferlog_std_format=YES
#
# You may override where the log file goes if you like. The default is shown
# below.
#
#xferlog_file=/var/log/xferlog
#
# Enable this to have booth logfiles. Standard xferlog and vsftpd's own style log.
#
#dual_log_enable=YES
#
# Uncomment this to enable session status information in the system process listing.
#
#setproctitle_enable=YES

# Transfer Settings
#
# Make sure PORT transfer connections originate from port 20 (ftp-data).
#
connect_from_port_20=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
#
# 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
#
# Set to NO if you want to disallow the PASV method of obtaining a data
# connection.
#
#pasv_enable=NO

# PAM setting. Do NOT change this unless you know what you do!
#
pam_service_name=vsftpd

# Set listen=YES if you want vsftpd to run standalone
#
listen=YES

# Set to ssl_enable=YES if you want to enable SSL
ssl_enable=NO
anon_mkdir_write_enable=NO
anon_upload_enable=NO
chroot_local_user=YES
ftpd_banner=Welcome to FTP server!
idle_session_timeout=900
local_enable=YES
log_ftp_protocol=NO
max_clients=10
max_per_ip=3
pasv_enable=YES
pasv_max_port=40500
pasv_min_port=40000
ssl_sslv2=NO
ssl_sslv3=NO
ssl_tlsv1=YES
write_enable=YES
local_root=/home

ABove is my vsftpd config file. I dont see any difference while comparing to your's but still same problem.

ChrisAbela · 11-13-2008, 03:11 AM

Make a backup of your /etc/vsftpd.conf,
then overwrite with mine.
then add the following lines:

Quote:

# PAM setting. Do NOT change this unless you know what you do!
#
pam_service_name=vsftpd

Then restart

sco1984 · 11-13-2008, 05:38 AM

Quote:

Originally Posted by ChrisAbela

Make a backup of your /etc/vsftpd.conf,
then overwrite with mine.
then add the following lines:

Then restart

My bad luck. It's now throwing new error after replacing your file.

Quote:

ftpserver:~ # service vsftpd start
Starting vsftpd startproc: exit status of parent of /usr/sbin/vsftpd: 1
failed

ChrisAbela · 11-13-2008, 06:19 AM

Go back to your own /etc/vsftpd.conf of course.
I had the same problem and this is how I solved it.

Add the line:

Quote:

chroot_list_file=/etc/vsftpd.chroot_list

Make sure that /etc/vsftpd.chroot_list exist and that it is empty.

Regretfully I am unable to replicate the problem now.

If this does not work I will replace my vsftpd.conf with yours and then I will try to find the bug.

Chris