ProFTPd server configuration: enable FTPS (OpenSSL mod_tls)

To setup SSL encryption in ProFTPd you can follow such instructions:

1. Generate self-signed SSL certificate & private key.

# mkdir -pv /etc/proftpd/ssl/
# cd /etc/proftpd/ssl/
# openssl req -new -x509 -days 365 -nodes -out /etc/proftpd/ssl/proftpd.cert.pem -keyout /etc/proftpd/ssl/proftpd.key.pem

You should fill form below:

Generating a 2048 bit RSA private key
.............................+++
................................+++
writing new private key to '/etc/proftpd/ssl/proftpd.key.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]:UA
State or Province Name (full name) []:Kyivska
Locality Name (eg, city) [Default City]:Kyiv
Organization Name (eg, company) [Default Company Ltd]:Shkodenko V. Taras Ltd
Organizational Unit Name (eg, section) []:IT
Common Name (eg, your name or your server's hostname) []:shkodenko.com
Email Address []:

2. Create mod_tls SSL configuration file /etc/proftpd/tls.conf :

<IfModule mod_tls.c>
TLSEngine                  on
TLSLog                     /var/log/proftpd/tls.log
TLSCipherSuite AES128+EECDH:AES128+EDH
TLSOptions                 NoCertRequest AllowClientRenegotiations
TLSRSACertificateFile      /etc/proftpd/ssl/proftpd.cert.pem
TLSRSACertificateKeyFile   /etc/proftpd/ssl/proftpd.key.pem
TLSVerifyClient            off
TLSRequired                on
RequireValidShell          no
</IfModule>

3. Include mod_tls SSL configuration file /etc/proftpd/tls.conf into main “/etc/proftpd.conf” using Include :

# ...
</Global>

# Define the log formats
LogFormat                       default "%h %l %u %t \"%r\" %s %b"
LogFormat                       auth    "%v [%P] %h %t \"%r\" %s"

# TLS
Include /etc/proftpd/tls.conf
# Explained at http://www.castaglia.org/proftpd/modules/mod_tls.html
# ...

4. Check ProFTPd configration using command:

# proftpd -td10

5. If there is no errors on step 4: restart ProFTPd service using:

# /etc/init.d/proftpd restart