Hello,
I've read numerous webpages but I still don't understand many things on how to
get it working properly.
I'm trying to add a subjectAltName so that my browser won't give me a
certificate warning whether I access the web server using the fqdn or an IP
address.
In many web pages about this topic they write this about the openssl.cnf
configuration
[ v3_req ]
....
subjectAltName = @alternate_names
which is defined by req_extensions = v3_req
And then
[ alternate_names ]
DNS.1 = example.com
1) My first question is why they all specify a dns as an alternate name ? Here
it looks like a domain name
I've made some tests and used
[ v3_req ]
....
subjectAltName = IP:1.1.1.1
It looks like things worked fine since I can see this address in this output's
command (after signing the certificate with my CA)
openssl x509 -noout -text -in myserver.crt
....
X509v3 Subject Alternative Name:
IP Address:1.1.1.1
2) My second question is that I would like this field to be a bit more dynamic.
I would like to avoid editing openssl.cnf everytime. When I generate a
certificate, the system prompts me for many fields including the cn. I would
like it to prompt for the subjectAltName too. How can I do this ?
Actually I've tryed to add "subjectAltName = Alternative names (comma seperated
list)" in the [ req_distinguished_name ] section defined by distinguished_name
= req_distinguished_name and it prompts me for that field but it's never
exported as a X509v3 Subject Alternative Name if I do that.
For the signature I use this command line
openssl x509 -extfile /etc/ssl/openssl.cnf -extensions v3_req -req -days 730
-in myserver.csr -CA myCA.crt -CAkey myCA.key -CAcreateserial -out myserver.crt
3) My openssl is compiled to read the configuration file /etc/ssl/openssl.cnf
by default when I generate certificates.
In that latest command I had to add -extfile /etc/ssl/openssl.cnf explicitly
otherwise the X509v3 extensions are not added. Why openssl doesn't look at
/etc/ssl/openssl.cnf automatically as it does for some other actions.
PS: I read the man which states that it defaults to x509_extensions but didn't
understand that fully.
Thank you for your answers
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