티스토리 뷰

Vmware의 하드가 날라가버리는 바람에 서버세팅부터 코드까지 다시짜게 되었습니다ㅠㅠ


오늘의 삽질항목은 vsftpd입니다.


원활한 업로드, 다운로드, root 권한 접속을 위하여 vsftpd.conf설정을 했습니다.


전체 셋팅을 일단 다 올리겠습니다. 

서버 환경은 Ubuntu 16.04.3 LTS입니다.


# 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.

#

#

# Run standalone?  vsftpd can run either from an inetd or as a standalone

# daemon started from an initscript.

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.

listen_ipv6=YES

#

# Allow anonymous FTP? (Disabled by default).

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

#

# If enabled, vsftpd will display directory listings with the time

# in  your  local  time  zone.  The default is to display GMT. The

# times returned by the MDTM FTP command are also affected by this

# option.

use_localtime=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.

# 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 restrict local users to their home directories.  See the FAQ for

# the possible risks in this before using chroot_local_user or

# chroot_list_enable below.

#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().

# (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

#

# Customization

#

# Some of vsftpd's settings don't fit the filesystem layout by

# default.

#

# This option should be the name of a directory which is empty.  Also, the

# directory should not be writable by the ftp user. This directory is used

# as a secure chroot() jail at times vsftpd does not require filesystem

# access.

secure_chroot_dir=/var/run/vsftpd/empty

#

# This string is the name of the PAM service vsftpd will use.

pam_service_name=ftp

#

# This option specifies the location of the RSA certificate to use for SSL

# encrypted connections.

rsa_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem

rsa_private_key_file=/etc/ssl/private/ssl-cert-snakeoil.key

ssl_enable=NO


#

# Uncomment this to indicate that vsftpd use a utf8 filesystem.

#utf8_filesystem=YES


참 상당히 많은 내용들과 알 수 없는 내용들이 있습니다.

제가 설정한 부분은 맨 처음 

#write_enable=YES -> write_enable=YES

위 설정은 쓰기 가능 여부에 대해 설정하는 부분으로 위와같이 옆의 주석(#)을 제거 했습니다.

두번 째 부분은

#chroot_local_user=YES -> chroot_local_user=YES

chroot_list_enable=YES -> chroot_list_enable=YES

#chroot_list_file=/etc/vsftpd.chroot_list -> chroot_list_file=/etc/vsftpd.chroot_list

chroot_local_user의 의미는 dir의 이동을 계정의 홈디렉터리까지 jail한다는 의미 입니다.

chroot_list_enable=YES의 의미는 jail할 계정들 목록을 사용할지 말지에 대한 여부를 묻는 항목입니다.

그리고 chroot_list_file=/etc/vsftpd.chroot_list 이 의미는 의에 리스트를 enable했을때 list파일을 지정하는 항목입니다.

그리고 오늘 제일 삽질했던 부분중 하나입니다. ftp로 root 접속시 530 에러를 띄웠습니다. 이 에러를 해결하기위해 

pam_service_name=vsftpd -> pam_service_name=ftp 로 수정하였습니다.

pam_service_name의 의미는  pam 파일명을 지정하는 의미입니다. 즉 ubuntu에 설정 된 pam파일이름을 vsftpd로 지정한게 아닌 ftp로 수정하여 530에러를 해결했습니다. 이후 root로그인에 성공했습니다. 오타 및 피드백이 있으시면 댓들 부탁드려요~~


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