Ubuntu 14.04 vsftp refusing to run with writable root inside chroot问题解决方法

_N_了吧唧的_

　　将Ubuntu 9.04升级到了Ubuntu 14.04 LTS，结果发现vsftpd恢复配置后，无法登陆，FlashFXP日志提示：

[18:33:18] Winsock 2.2 -- OpenSSL 1.0.1h 5 Jun 2014

[18:33:24] [R] 正在连接到 10.10.10.111 -> IP=10.10.10.111 PORT=21

[18:33:24] [R] 已连接到 10.10.10.111

[18:33:24] [R] 220 Welcome to Yimiju FTP service.

[18:33:24] [R] USER ******

[18:33:24] [R] 331 Please specify the password.

[18:33:24] [R] PASS (hidden)

[18:33:24] [R] 500 OOPS: vsftpd: refusing to run with writable root inside chroot()

[18:33:24] [R] 连接失败

[18:33:24] [R] 尝试重新连接 #10 次后延迟 1 秒

　　vsftp版本是3.0.2
　　root@yimiju:~# vsftpd -v
　　vsftpd: version 3.0.2
　　解决方法：
　　在vsftp配置文件（/etc/vsftpd.conf）最后增加一行：
　　allow_writeable_chroot=YES
　　如果不想用vi或者vim编辑，可以用下面这个命令：
　　# echo "allow_writeable_chroot=YES" >> /etc/vsftpd.conf
　　然后重启vsftpd服务：
　　# service vsftpd restart
　　附上我的Ubuntu 14.04 vsftp 3.0.2配置文件：
　　root@yimiju:~# cat /etc/vsftpd.conf
　　# 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>　　# capabilities.
　　#
　　#
　　# Run standalone? vsftpd can run either from an inetd or as a standalone
　　# daemon started from an initscript.
　　listen=YES
　　#
　　# Run standalone with IPv6?
　　# Like the listen parameter, except vsftpd will listen on an IPv6 socket
　　# instead of an IPv4 one. This parameter and the listen parameter are mutually
　　# exclusive.
　　#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_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>　　# 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 Yimiju 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=vsftpd
　　#
　　# 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
　　# This option specifies the location of the RSA key to use for SSL
　　# encrypted connections.
　　rsa_private_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
　　userlist_enable=YES
　　tcp_wrappers=YES
　　local_root=/usr/local/yimiju
　　allow_writeable_chroot=YES