Make ecdh-curve optional

Author: jkroepke

REFERENCE.md

@@ -1339,11 +1339,11 @@ Default value: `'secp384r1'`
 
 ##### <a name="ecdh_curve"></a>`ecdh_curve`
 
-Data type: `String`
+Data type: `Optional[String[1]]`
 
 Define the named curve for ECDH key exchange, used if ssl_key_algo is ec, ed
 
-Default value: `'secp384r1'`
+Default value: ``undef``
 
 ##### <a name="topology"></a>`topology`
 

manifests/server.pp

@@ -184,7 +184,7 @@
   Enum['rsa', 'ec', 'ed'] $ssl_key_algo                             = 'rsa',
   Integer $ssl_key_size                                             = 2048,
   String $ssl_key_curve                                             = 'secp384r1',
-  String $ecdh_curve                                                = 'secp384r1',
+  Optional[String[1]] $ecdh_curve                                   = undef,
   String $topology                                                  = 'net30',
   Boolean $c2c                                                      = false,
   Boolean $tcp_nodelay                                              = false,

templates/server.erb

@@ -46,6 +46,8 @@ dh <%= @server_directory %>/<%= @ca_name %>/keys/dh<%= @ssl_key_size %>.pem
 dh <%= @server_directory %>/<%= @ca_name %>/keys/dh.pem
 <%- else -%>
 dh none
+<%- end -%>
+<%- if @ecdh_curve -%>
 ecdh-curve <%= @ecdh_curve %>
 <%- end -%>
 <%   end -%>