CentOS 8
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FTP Server : Pure-FTPd Over SSL/TLS
2019/11/05
 
Enable SSL/TLS for Pure-FTPd 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.
[root@www ~]#
cd /etc/pki/tls/certs

[root@www certs]#
openssl req -x509 -nodes -newkey rsa:2048 -keyout /etc/pki/tls/certs/pure-ftpd.pem -out /etc/pki/tls/certs/pure-ftpd.pem

/certs/pure-ftpd.pem -out /etc/pki/tls/certs/pure-ftpd.pem  -keyout /etc/pki/tls/
Generating a RSA private key
..+++++
........................................
writing new private key to '/etc/pki/tls/certs/pure-ftpd.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

[root@www certs]#
chmod 600 pure-ftpd.pem

[2] Configure Pure-FTPd. Configure basic settings before it, refer to here.
[root@www ~]#
vi /etc/pure-ftpd/pure-ftpd.conf
# line 418: uncomment

TLS                          1

# line 438: uncomment and specify your certificate

CertFile                     /etc/pki/tls/certs/pure-ftpd.pem

[root@www ~]#
systemctl restart pure-ftpd

FTP Client : CentOS
 
Configure FTP Client to use FTPS connection on CentOS.
[3] Install FTP Client first, and configure like follows.
[redhat@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
[redhat@dlp ~]$
lftp -u cent www.srv.world

Password:
lftp cent@www.srv.world:~>
FTP Client : Windows
[4] For example of FileZilla on Windows, Open [File] - [Site Manager].
[5] Input connection infomation like follows, for encryption field, select [explicit FTP over TLS].
[6] User's Password is required. Input it.
[7] If you set self-signed certificate, following warning is shown, it's no ploblem. Go next.
[8] If settings are OK, it's possible to connect to FTP server with FTPS like follows.
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