#ftp 127.0.0.1
Connected to 127.0.0.1 (127.0.0.1).
220 Welcome to virtual FTP service.
Name (127.0.0.1:root): liyangsuper
331 Please specify the password.
Password:
230 Login successful. Have fun.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> ls
227 Entering Passive Mode (127,0,0,1,119,210)
150 Here comes the directory listing.
drwxr-xr-x 2 0 0 4096 Jul 09 15:26 ftp
226 Directory send OK.
能够浏览虚拟目录/home/ftp里的文件和目录
ftp> cd ftp
250 Directory successfully changed.
ftp> ls
227 Entering Passive Mode (127,0,0,1,149,3)
150 Here comes the directory listing.
-rw-r--r-- 1 0 0 10 Jul 09 15:26 test.c
226 Directory send OK.
测试是否能够创建目录
ftp> mkdir super
550 Permission denied.//操作被禁止
ftp> bye
221 Goodbye.
#ftp 127.0.0.1 10003
Connected to 127.0.0.1 (127.0.0.1).
220 (vsFTPd 1.1.3)
Name (127.0.0.1:root): anonymous
331 Please specify the password.
Password:
230 Login successful. Have fun.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> bye
221 Goodbye.
# ftp 210.77.27.222 10003
Connected to 210.77.27.222 (210.77.27.222).
220 Welcome to virtual FTP service.
使用匿名用户登录，成功：
Name (210.77.27.222:root): anonymous
331 Please specify the password.
Password:
230 Login successful. Have fun.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> ls
227 Entering Passive Mode (210,77,27,222,51,224)
150 Here comes the directory listing.
drwxr-xr-x 2 0 0 4096 Jul 09 15:26 pub
226 Directory send OK.
ftp> cd pub
250 Directory successfully changed.
ftp> ls
227 Entering Passive Mode (210,77,27,222,223,123)
150 Here comes the directory listing.
-rw-r--r-- 1 0 0 10 Jul 09 15:26 test.c
226 Directory send OK.
ftp> bye
221 Goodbye.
连接虚拟FTP服务器，其IP地址为210.77.27.223，端口号为10004：
# ftp 210.77.27.223 10004
Connected to 210.77.27.223 (210.77.27.223).
220 Welcome to virtual FTP service.
使用匿名用户登录，成功：
Name (210.77.27.223:root): anonymous
331 Please specify the password.
Password:
230 Login successful. Have fun.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> ls
227 Entering Passive Mode (210,77,27,223,102,119)
150 Here comes the directory listing.
drwxr-xr-x 2 0 0 4096 Jul 10 13:23 pub
226 Directory send OK.
进入该登录文件夹：
ftp> cd pub
250 Directory successfully changed.
ftp> ls //由于该虚拟服务器没有加入任何文件，所以ls结果为空
227 Entering Passive Mode (210,77,27,223,170,40)
150 Here comes the directory listing.
226 Directory send OK.
ftp> bye
221 Goodbye.
示例配置
# tree /etc/vsftpd/
/etc/vsftpd/
├── ftpusers
├── user_list
├── vsftpd.conf
└── vsftpd_conf_migrate.sh
0 directories, 4 files
$ cat /etc/vsftpd/ftpusers
# Users that are not allowed to login via ftp
root
bin
daemon
adm
lp
sync
shutdown
halt
mail
news
uucp
operator
games
nobody
$ cat /etc/vsftpd/user_list
# vsftpd userlist
# If userlist_deny=NO, only allow users in this file
# If userlist_deny=YES (default), never allow users in this file, and
# do not even prompt for a password.
# Note that the default vsftpd pam config also checks /etc/vsftpd/ftpusers
# for users that are denied.
root
bin
daemon
adm
lp
sync
shutdown
halt
mail
news
uucp
operator
games
nobody
ftp
$ cat /etc/vsftpd/vsftpd.conf
# 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=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.
# 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=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
userlist_deny=NO
$
问题
卸载vsftpd出错
$ sudo apt remove vsftpd
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
vsftpd
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 352 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 215847 files and directories currently installed.)
Removing vsftpd (3.0.3-8) ...
dpkg: error processing package vsftpd (--remove):
subprocess installed post-removal script returned error exit status 1
Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg received a segmentation fault.