VSFTP: no tcp wrapper support compiled in

lagu2653 · 11-16-2005, 09:40 AM

SUSE Pro 9.3
I have a network between a WinXP PC and a Linux SUSE PC. I want to be able to transer files between the machines. I used the Windows explorer to transfer files (I think the protocol is smb:// (Samba)). But I got 50% higher transfer rates if I used the HTTP protocol (WLAN). I couldn't figure out how to upload files to an Apache server so I moved over to VSFTP instead, thinking the transfer rates would be just as high. VSFTP works but I think my configuration is slightly insecure. I want users (the WinXP box) to be able to upload files and to delete files in one directory, a sub-directory of /srv/ftp/. So I thought I would use tcp wrappers to make sure only my WinXP machine could access the ftp-service. (The ftp-server will only be up when I'm transferring files.) But it seems like my version of vsftp doesn't support tcp wrappers.

Code:

$ ftp 192.168.1.4
Connected to 192.168.1.4.
500 OOPS: tcp_wrappers is set to YES but no tcp wrapper support compiled in
421 Service not available, remote server has closed connection
ftp>

How do I secure my system?

Here's my /etc/vsftpd.conf file:

Quote:

tcp_wrappers=YES
# 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().
#
#chroot_list_enable=YES
#
# (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=YES
#
# 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=lagu2653
#
# 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

unSpawn · 11-17-2005, 08:21 AM

If it doesn't then you can recompile it so it does. Else add a few iptables rules or add a range restriction in Xinetd if it runs from there. Your config (grep -ie "^[a-z]" config is better readable) gives too much permissions to anonymous users, that's nearly always a Bad Thing. Make sure you need the anonymous stuff.