Specify allowed characters for common name

functions.sh

@@ -24,7 +24,7 @@ SHOREWALLVARS="/etc/shorewall/openvpn.vars"
 
 function ask_key_questions
 {
-	read -p "Common Name of certificate (this should be unique): " OVPN_COMMONNAME
+	read -p "Common Name of certificate (this should be unique using [A-z0-9_] only ): " OVPN_COMMONNAME
 	read -p "Users E-mail address for certificate: " OVPN_EMAIL
 }