El uso de mod_rewrite no es la forma recomendada, sino que usa el host virtual y la redirección.
En el caso, si está dispuesto a hacerlo usando mod_rewrite:
RewriteEngine On
# This will enable the Rewrite capabilities
RewriteCond %{HTTPS} !=on
# This checks to make sure the connection is not already HTTPS
RewriteRule ^/?(.*) https://%{SERVER_NAME}/$1 [R,L]
# This rule will redirect users from their original location, to the same
location but using HTTPS.
# i.e. http://www.example.com/foo/ to https://www.example.com/foo/
# The leading slash is made optional so that this will work either in
# httpd.conf or .htaccess context
Referencia: Httpd Wiki - RewriteHTTPToHTTPS
Si está buscando un redireccionamiento permanente 301, el indicador de redireccionamiento debe ser como,
R=301
entonces la RewriteRule será como,
RewriteRule ^/?(.*) https://%{SERVER_NAME}/$1 [R=301,L]