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 再投稿 突然、FTPにログイン出来なくなる
日時: 2007/07/19 09:49
名前: かときち   <masao@katou.sc>

 お世話になります。

 色々と検索して調べてみましたが、どうしてもわからないので、再度質問させて頂きます。

[症状]
 今までFTPにログイン出来ていたのに、突然ログイン出来なくなりました。
 FFFTPでは530エラー(「正しいパスワードを入れてください」)と出ます。

#ftp localhostとすると、

[root@f7server ~]# ftp localhost
Connected to localhost (127.0.0.1).
500 OOPS: vsftpd: cannot locate user specified in 'chown_username':whoever
ftp>

 と表示されます。


[FTPサーバの種類]
 vsftpd

[FTPサーバとの接続方法]
 IPアドレス直接指定

[getenforceの値]
 Disabled

[ファイアーウォール]
 切っています。

[Fedoraのバージョン]
 Fedora7

 以上です。

 何故急に接続できなくなるのか、全くわかりません。
 どうぞ宜しくお願い致します。

■ コンテンツ関連情報

 Re: 再投稿 突然、FTPにログイン出来なくなる ( No.1 )
日時: 2007/07/19 09:50
名前: かときち   <masao@katou.sc>

[vsftpd.confの内容]

# 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=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
#
# 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
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 f7server 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().
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. To listen on IPv4 and IPv6
# sockets, you must run two copies of vsftpd whith two configuration files.
# Make sure, that one of the listen options is commented !!
#listen_ipv6=YES

pam_service_name=vsftpd
userlist_enable=YES
tcp_wrappers=YES

use_localtime=YES

pasv_promiscuous=YES
pasv_min_port=50000
pasv_max_port=50030


 宜しくお願い致します。
 Re: 再投稿 突然、FTPにログイン出来なくなる ( No.2 )
日時: 2007/07/19 13:09
名前: 機動戦車ガンタンク

ひょっとしてですけど、chroot_listにホームパスより上の階層にアクセスできないユーザー
を指定していないとかはないですか?
 Re: 再投稿 突然、FTPにログイン出来なくなる ( No.3 )
日時: 2007/07/19 15:25
名前: かときち   <masao@katou.sc>

 レスして頂きありがとうございます。

 chroot_listには、上の階層にアクセスさせないユーザーを書いてあります。(ftpmanと言う適当なものです)

 まだ他に何か見落としているものは有るでしょうか。
 御教示頂ければ幸いです。

 宜しくお願い致します。
 Re: 再投稿 突然、FTPにログイン出来なくなる ( No.4 )
日時: 2007/07/19 16:29
名前: かときち   <masao@katou.sc>

 vsftpd.confの訂正です。

# 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

 上記のように設定しています。
 Re: 再投稿 突然、FTPにログイン出来なくなる ( No.5 )
日時: 2007/07/19 16:59
名前: かときち   <masao@katou.sc>

その他の設定です。

[/etc/hosts.allow]

# hosts.allow  This file describes the names of the hosts which are
#        allowed to use the local INET services, as decided
#        by the '/usr/sbin/tcpd' server.
#

ALL : ALL

[/etc/hosts.deny]

# hosts.deny  This file describes the names of the hosts which are
#        *not* allowed to use the local INET services, as decided
#        by the '/usr/sbin/tcpd' server.
#
# The portmap line is redundant, but it is left to remind you that
# the new secure portmap uses hosts.deny and hosts.allow. In particular
# you should know that NFS uses portmap!

[/etc/vsftpd/chroot_list]

ftpman

[/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.
bin
daemon
adm
lp
sync
shutdown
halt
mail
news
uucp
operator
games
nobody

以上です。

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