Vsftpd on Coinidea's Blog

[vsftpd] vsftpd Passive Mode Configuration

Wed, 10 Apr 2019 02:56:05 +0000

vsftpd.conf

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# Example config file /etc/vsftpd/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.
# When SELinux is enforcing check for SE bool ftp_home_dir
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.
# When SELinux is enforcing check for SE bool allow_ftpd_anon_write, allow_ftpd_full_access
#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/xferlog
#
# If you want, you can have your log file in standard ftpd xferlog format.
# Note that the default log file location is /var/log/xferlog in this case.
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 blah 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().
# (Warning! chroot'ing can be very dangerous. If using chroot, make sure that
# the user does not have write access to the top level directory within the
# chroot)
chroot_local_user=YES
chroot_list_enable=NO
# (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
#
# When "listen" directive is enabled, vsftpd runs in standalone mode and
# listens on IPv4 sockets. This directive cannot be used in conjunction
# with the listen_ipv6 directive.
listen=YES
#
# This directive enables listening on IPv6 sockets. By default, listening
# on the IPv6 "any" address (::) will accept connections from both IPv6
# and IPv4 clients. It is not necessary to listen on *both* IPv4 and IPv6
# sockets. If you want that (perhaps because you want to listen on specific
# addresses) then you must run two copies of vsftpd with two configuration
# files.
# Make sure, that one of the listen options is commented !!
listen_ipv6=NO

pam_service_name=vsftpd
userlist_enable=YES
tcp_wrappers=YES
local_root=/ftp
anon_root=/ftp
use_localtime=YES
user_config_dir=/etc/vsftpd/userconfig
pasv_enable=yes
pasv_min_port=41000
pasv_max_port=42000
allow_writeable_chroot=YES
listen_port=21
xferlog_file=/var/log/vsftpd.log
pasv_address=your_ip
pasv_addr_resolve=yes
pasv_promiscuous=YES

user_list

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# Comment out everything in this file

chroot_list

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ftpuser
ftpsubuser

/etc/vsftpd/userconfig/ftpsubuser

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local_root=/ftp/ftpsubuser/

Commands to execute:

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sudo useradd ftpuser -d /ftp -s /sbin/nologin -m
passwd ftpuser

sudo useradd ftpsubuser -d /ftp/ftpsubuser -s /sbin/nologin -m
passwd ftpsubuser

[CentOS]Upgrading OpenSSH and vsftpd on CentOS

Thu, 23 Nov 2017 08:05:04 +0000

Upgrading OpenSSH to Version 7.4 or Above

Background

Currently, OpenSSH versions below 7.4 on Linux have some critical vulnerabilities, and OpenSSH needs to be upgraded to version 7.4 or above. On a machine without external network access (no yum), this is quite troublesome. Online resources generally recommend backing up SSH and installing Telnet first, so you can still access the machine via Telnet if the upgrade fails.

Common Issues and Solutions

4. Dependencies required for manually compiling OpenSSH

zlib
pam
pam-devel

If you get the error configure: error: PAM headers not found, you can download pam-devel:

http://rpm.pbone.net/index.php3?stat=26&dist=74&size=208492&name=pam-devel-1.1.1-17.el6.x86_64.rpm

5. OpenSSL download

ftp://ftp.openssl.org/source/

6. Installing OpenSSL

References:

Notes

If SecureCRT cannot log in after upgrading OpenSSH, it may be because the SecureCRT version is too old to support certain encryption protocols:

Reference: http://blog.csdn.net/yangg1991/article/details/51755562

Steps to Upgrade OpenSSH

Reference: http://blog.csdn.net/u011080082/article/details/64503534

Upgrading vsftpd from 2.2.2 to 2.3.4

Download the vsftpd-2.3.4.tar.gz package. For 64-bit systems, note:

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sed -i 's/lib\/lib64\/g' vsf_findlibs.sh
sed -i 's/lib\//lib64\//g' vsf_findlibs.sh

Configuring vsftpd

Using active mode:

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vsftpd /etc/vsftpd/vsftpd.conf &

When starting in standard_alone mode, you need to add the following two lines to the top of the configuration file:

Reference: http://wingjang.blog.163.com/blog/static/47913442200811113104509/

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listen=YES
listen_port=21

After installation, only anonymous users are allowed to log in by default, so you need to modify the configuration:

Reference: http://blog.sina.com.cn/s/blog_7e16680c01018ox1.html

Handling TCP_Wrapper Issues

If there are issues, pay attention to removing spaces, or you can remove it entirely: