Disable Diffie-Hellman Modulus vsFTPD

I couldn’t find how to disable Diffie-Hellman encryption in vsFTPD TLS.

PCi compliance scanner refused to skip this server until we fixed the vsftp server config:

The author of weakdh.org described how to disable Diffie-Hellman for Ligtpd,Nginx and Tomcat, but not for ` vsFTPD`.

I will make a reservation that I worked with vsFTPD v.3.0.2. Not sure if it will work for previous versions.

Open the configuration file for editing:

vim /etc/vsftpd/vsftpd.conf

Disable ssl v1,v2,v3 to make vsftpd encrypt all traffic using tls v.1.1 and v.1.2:

ssl_tlsv1=NO  
ssl_sslv2=NO  
ssl_sslv3=NO

Next update the list of allowed ciphers to match the following and restart vsFTPD daemon:

ssl_ciphers=ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-DSS-AES128-SHA256:DHE-DSS-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA:!DHE-RSA-AES128-GCM-SHA256:!DHE-RSA-AES256-GCM-SHA384:!DHE-RSA-AES128-SHA256:!DHE-RSA-AES256-SHA:!DHE-RSA-AES128-SHA:!DHE-RSA-AES256-SHA256:!DHE-RSA-CAMELLIA128-SHA:!DHE-RSA-CAMELLIA256-SHA