linux系统用户登录ftp

系统用户登录ftp

local_enable=YES	默认启用
write_enable=YES	默认启用

1.实验1

1.编辑配置文件

• 禁锢系统用户在家目录里,前提要去除对用户家目录的写权限

vim /etc/vsftpd/vsftpd.conf


chroot_list_enable=YES
chroot_list_file=/etc/vsftpd/chroot_list

2.创建禁锢列表

cat /etc/vsftpd/chroot_list
user1
user2

3.创建实验用户

for i in {1..3}; do useradd user$i; echo "1" |passwd --stdin user$i; done

如果想把某个用户锁住,不让他乱跑.一定要把家目录的主目录写权限去掉

chmod a-w /home/user2
chmod a-w /home/user1

2.实验2

1.创建用户

useradd john
echo "123"  |passwd --stdin john

2.创建下载目录

mkdir -p /data/johnftp/files

3.修改john用户的家目录

注意: john用的家目录是/data/john/

usermod -d /data/johnftp/ john

4.修改files目录的权限,在使用时能够有权限上传下载

注意:此处授权的是files目录,files的属主属组是john

chown john.john /data/johnftp/files/

5.去掉john用户加目录的读权限

chmod a-w /data/johnftp/

6.填写锁列表

cat /etc/vsftpd/chroot_list
user1
user2
john

7.完整的/etc/vsftp/vsftp.conf配置文件

点击查看代码

# 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
anon_world_readable_only=NO
anon_other_write_enable=YES
anon_mkdir_write_enable=YES
anon_upload_enable=YES
#
# 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. The vsftpd.conf(5) man page explains
# the behaviour when these options are disabled.
# 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=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
#
# 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=NO
#
# 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 !!
pasv_enable=YES
pasv_min_port=40000
pasv_max_port=40010
listen_ipv6=YES
chroot_list_enable=YES
chroot_list_file=/etc/vsftpd/chroot_list
pam_service_name=vsftpd
tcp_wrappers=YES

8.iptables

yum remove firewalld
yum install iptables-services.x86_64 

yum install -y iptables   #安装iptables  

yum update iptables   #升级iptables  

yum install iptables-services  #安装iptables-services  

systemctl start iptables.service 
iptables -F
iptables -X
iptables -Z
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT
iptables -A INPUT -p all -s 127.0.0.1 -j ACCEPT 
iptables -A INPUT -p all -s 10.0.0.10 -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT ACCEPT
iptables-save > /etc/sysconfig/iptables 
iptables -A INPUT -p tcp -m iprange --src-range 10.0.0.1-10.0.0.154 -m multiport --dports 20,21 -j ACCEPT
iptables -A INPUT -p tcp -m iprange --src-range 10.0.0.1-10.0.0.154 -m multiport --dports 20,21 -j ACCEPT
iptables -A INPUT -p tcp --dport 40000:40010  -j ACCEPT