[Linux] 네트워크 서비스 - FTP

FTP - vsftpd

vsftpd 설정 파일

/etc/vsftpd/vsftpd.conf

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# Example config file /etc/vsftpd/vsftpd.conf

#

# Allow anonymous FTP? (Beware - allowed by default if you comment this out).

anonymous_enable=YES     # anonymous계정을 사용할 것인지

#

# Uncomment this to allow local users to log in.

# When SELinux is enforcing check for SE bool ftp_home_dir

local_enable=YES             # 시스템 로컬 계정들이 FTP를 사용할 것인지

#

# Uncomment this to enable any form of FTP write command.

write_enable=YES             # 쓰기, 업로드를 가능하게 할 것인지

#

# 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             # 초기 모드 값 지정, 파일666-022, 디렉터리777-022

#

# 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 # 익명ftp 사용자에게 쓰기 권한을 줄 것인지

#

# Uncomment this if you want the anonymous FTP user to be able to create

# new directories.

#anon_mkdir_write_enable=YES # 익명ftp 에서 하위 디렉터리를 만드는 것에 대해 허용 할 것인지

#

# 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             # xferlog 로그 사용

#

# Make sure PORT transfer connections originate from port 20 (ftp-data).

connect_from_port_20=YES     # yes : Active 모드, no : Passive 모드

#

# 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 # 익명ftp의 업로드를 허용했을 때, 업로드 된 파일의 소유권자를 바꿀 것인가

#chown_username=whoever # root로 할 경우 악의적인 공격에 쉽게 노출됨

#

# You may override where the log file goes if you like. The default is shown

# below.

#xferlog_file=/var/log/xferlog # 전송 로그를 남길 디렉터리 파일 경로

#

# 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        # 표준 xferlog 포맷을 사용할 것인가

#

# You may change the default value for timing out an idle session.

#idle_session_timeout=600   # 세션 타임아웃 값 설정

#

# You may change the default value for timing out a data connection.

#data_connection_timeout=120 # 데이터 전송 후 컨넥션 지속 타임아웃 값 설정

#

# 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. # 접속 시 클라이언트에서 보여줄 배너 메시지

#

# 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     # 전체 사용자를 chroot 적용, 사용 시, chroot_list_enable 사용 못함

#chroot_list_enable=YES    # ftp홈디렉터리를 루트 디렉터리로 사용 할 것인가, 아래 chroot_list 파일 없을 경우 ftp접속 에러

# (default follows)

#chroot_list_file=/etc/vsftpd/chroot_list # 해당 파일에 등록된 사용자만 chroot 적용

#

# 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             # yes인 경우 standalone 방식 동작, no인 경우 xinetd 방식 동작

#

# 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=YES

pam_service_name=vsftpd # pam(인증 보안 관련 모듈), ftp접속 인증 시 pam을 이용하게 되는데 그 곳에서 사용할 이름

userlist_enable=YES         # FTP 사용을 금지하는 유저, /etc/vsftpd/user_list에 등록

tcp_wrappers=YES           # 접속 관련 제어

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