How tell OpenSSL to prompt?

[Charles Mills]

This is probably the world's most basic question but I can't find the
answer.

 

I have the following in my OpenSSL config file:

 

<snip>

[ usr_cert ]

<snip>

subjectAltName =                           @alt_names

<snip>

[ alt_names ]

DNS.1 = foo.com

DNS.2 = bar.com

<snip>

 

It's working as expected. But what I am trying to get it to do is either
prompt the user, or accept foo.com and bar.com on the command line. How do I
do that?

 

Is there documentation for the basic scheme of the configuration file? All I
have found is documentation for particular usages, but no syntax overview;
how you might say DNS.1 = @prompt or something like that.

 

Thanks much.

 

Charles