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FTP Server on CentOS7 を構築する

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KVM ゲスト OS インストール用の iso ファイル等を Windows 環境からアップロードするために FTP Server を構築する

vsftpd をインストール

# yum install vsftpd

設定ファイル編集

# vi /etc/vsftpd/vsftpd.conf
anonymous_enable=NO #匿名アクセス無効
chroot_local_user=YES #ホームディレクトリより上位へのアクセス禁止
chroot_list_enable=YES #ホームディレクトリより上位へのアクセス許可リストを有効化
chroot_list_file=/etc/vsftpd/chroot_list #アクセス許可リスト
listen=YES #IPv4でリッスンする
listen_ipv6=NO #IPv6はリッスンしない
userlist_enable=YES
userlist_deny=NO
userlist_file=/etc/vsftpd/user_list
rsa_cert_file=/etc/pki/tls/certs/vsftpd.pem #サーバ証明書

ユーザリストに ftp 接続用ユーザを追加

# vi /etc/vsftpd/user_list
testuser

chroot_list ユーザのリスト作成

# vi /etc/vsftpd/chroot_list
testuser

サーバ証明書作成

# cd /etc/pki/tls/certs/
# make vsftpd.pem
umask 77 ; \
PEM1=`/bin/mktemp /tmp/openssl.XXXXXX` ; \
PEM2=`/bin/mktemp /tmp/openssl.XXXXXX` ; \
/usr/bin/openssl req -utf8 -newkey rsa:2048 -keyout $PEM1 -nodes -x509 -days 365 -out $PEM2 -set_serial 0 ; \
cat $PEM1 >  vsftpd.pem ; \
echo ""    >> vsftpd.pem ; \
cat $PEM2 >> vsftpd.pem ; \
rm -f $PEM1 $PEM2
Generating a 2048 bit RSA private key
...............+++
......................+++
writing new private key to '/tmp/openssl.XjyYCB'
-----
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [XX]:JP
State or Province Name (full name) []:Tokyo
Locality Name (eg, city) [Default City]:Sinagawa
Organization Name (eg, company) [Default Company Ltd]:xxx.com
Organizational Unit Name (eg, section) []:
Common Name (eg, your name or your server's hostname) []:ftp.xxx.com
Email Address []:root@xxx.com

vsftpd 起動

# systemctl start vsftpd

vsftpd の自動起動設定

# systemctl enable vsftpd
Created symlink from /etc/systemd/system/multi-user.target.wants/vsftpd.service to /usr/lib/systemd/system/vsftpd.service.

ファイアウォールの設定

# firewall-cmd --add-service=ftp
success
# firewall-cmd --add-service=ftp --permanent
success
# firewall-cmd --list-services
dhcpv6-client ftp ssh

root で ftp 接続したい場合は、ftpusers の root をコメントアウトする

# vi /etc/vsftpd/ftpusers
#root

root での ftp 接続はセキュリティの観点から許可されておらず、/etc/pam.d/vsftpd の 3 行目で拒否設定されている

# vi /etc/pam.d/vsftpd
#%PAM-1.0
session    optional     pam_keyinit.so    force revoke
auth       required     pam_listfile.so item=user sense=deny file=/etc/vsftpd/ftpusers onerr=succeed
auth       required     pam_shells.so
auth       include      password-auth
account    include      password-auth
session    required     pam_loginuid.so
session    include      password-auth
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