FTP Server : Vsftpd Over SSL/TLS2019/01/24

	Enable SSL/TLS for Vsftpd to use secure FTP connections.
[1]	Create self-signed certificates. But if you use valid certificates like from Let's Encrypt or others, you don't need to create this one.

www:~ #

cd /etc/ssl/private

www:/etc/ssl/private #

openssl req -x509 -nodes -newkey rsa:2048 -keyout vsftpd.pem -out vsftpd.pem -days 365

Generating a 2048 bit RSA private key
............+++
......+++
writing new private key to '/etc/pki/tls/certs/vsftpd.pem'
-----
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   country code
State or Province Name (full name) []:Hiroshima    State
Locality Name (eg, city) [Default City]:Hiroshima  city
Organization Name (eg, company) [Default Company Ltd]:GTS  company
Organizational Unit Name (eg, section) []:Server World     department
Common Name (eg, your name or your server's hostname) []:www.srv.world  server's FQDN
Email Address []:root@srv.world   admin's email

[2]	Configure Vsftpd.

www:~ #

vi /etc/vsftpd.conf

# line 194: change

ssl_enable=

YES

# add to the end

rsa_cert_file=/etc/ssl/private/vsftpd.pem
rsa_private_key_file=/etc/ssl/private/vsftpd.pem
ssl_ciphers=HIGH
force_local_data_ssl=YES
force_local_logins_ssl=YES

www:~ #

systemctl restart vsftpd

[3]	If Firewalld is running, allow FTP related ports.

www:~ #

vi /etc/vsftpd/vsftpd.conf

# add to the end

# fix PASV ports

pasv_enable=YES
pasv_min_port=21000
pasv_max_port=21010

www:~ #

systemctl restart vsftpd

www:~ #

firewall-cmd --add-service=ftp --permanent

success
www:~ #

firewall-cmd --add-port=21000-21010/tcp --permanent

success
www:~ #

firewall-cmd --reload

success

FTP Client : SUSE

	Configure FTP Client to use FTPS connection.
[4]	Install FTP Client and configure like follows.

suse@dlp:~>

vi ~/.lftprc

# create new

set ftp:ssl-auth TLS
set ftp:ssl-force true
set ftp:ssl-protect-list yes
set ftp:ssl-protect-data yes
set ftp:ssl-protect-fxp yes
set ssl:verify-certificate no

suse@dlp:~>

lftp -u suse www.srv.world

Password:
lftp suse@www.srv.world:~>

FTP Client : Windows

[5]	For example of FileZilla on Windows, Open [File] - [Site Manager].

[6]	Input user info like follows, for encryption field, select [explicit FTP over TLS].

[7]	The user's Password is required. Input it.

[8]	If you set self-signed certificate, following warning is shown, it's no ploblem. Go next.

[9]	Just connected with FTPS.

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