sftp vsftp

Generate a Certificate

You use OpenSSL to generate a certificate for vsftpd. The certificate is store on your server, in a location of your choice. Here I choose to put it in the /etc/vsftpd directory. As well, you specify a 'lifetime' for the certificate; here's it set for a year ("-days 365").
Note that the backslashes only signify line breaks. You should be able to copy/paste & run it as it is, or remove the backslashes and the line breaks. You may need to create this directory first (mkdir /etc/vsftpd).

 [root@vps] openssl req -x509 -nodes -days 365 -newkey rsa:1024 \
 -keyout /etc/vsftpd/vsftpd.pem \
 -out /etc/vsftpd/vsftpd.pem

You will be prompted with a series of question, which you answer as they appear. When done the certificate will be installed in the /etc/vsftpd directory.

Configure vsftpd

To configure vsftpd you edit the file /etc/vsftpd/vsftpd.conf and add the following lines:

 ssl_enable=YES
 allow_anon_ssl=NO
 force_local_data_ssl=NO
 force_local_logins_ssl=NO
 ssl_tlsv1=YES
 ssl_sslv2=NO
 ssl_sslv3=NO
 rsa_cert_file=/etc/vsftpd/vsftpd.pem

Restart vsftpd for these settings to take effect