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LN-vsftpdの変更点

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! Tips
https://www.softel.co.jp/blogs/tech/archives/2437

! symlink -> bind
 $ mount --bind /home/B/org /home/A/lnk

! CONF sample

 # 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
 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=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
 # 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 !!
 # listen_ipv6=YES
 listen_ipv6=NO
 
 #
 local_root=public_html
 use_localtime=YES
 
 # pam_service_name=vsftpd
 # userlist_enable=YES
 # tcp_wrappers=YES
 #

! conf 2
 # 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=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 !!
 listen_ipv6=YES
 
 pam_service_name=vsftpd
 userlist_enable=YES
 user_config_dir=/etc/vsftpd/vsftpd_user_conf
 # tcp_wrappers=YES
 
 seccomp_sandbox=NO
 allow_writeable_chroot=YES
 #



! filewall 
 firewall-cmd --add-service=ftp --permanent
 firewall-cmd --permanent --add-port=21/tcp
 firewall-cmd --reload

 setsebool -P ftp_home_dir on