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Comments on GnuTLS config for my own root CA, for use on internal server

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GnuTLS config for my own root CA, for use on internal server

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I am trying to generate my own root CA certificate.

Context

My goal is to sign an intermediate CA with this certificate, and then install the intermediate CA on my own client machines. The intermediate CA will be used to sign a server on my private LAN. The server has no inbound route and cannot be seen from the public internet. I use the server to run my own personal services for my family.

Code (config)

I use gnutls with the following config:

# https://gnutls.org/manual/html_node/certtool-Invocation.html#certtool-Invocation

# These don't actually exist but I assume it doesn't matter
cn = "nosuchdomain.com"
organization = FakeCompanyName

country = US
state = California
locality = "San Francisco"

expiration_days = 3650

dns_name = "nosuchdomain.com"

ca
cert_signing_key

The command to generate is:

certtool \
    --generate-self-signed \
    --load-privkey /path/to/private/key \
    --template /path/to/config \
    --ask-pass \
    --outfile /path/to/root/cert

Review goals

My goal is to create my own root CA for the purpose of setting up TLS on my own server that is only accessible from my own LAN. I will not have clients install this root CA, rather, it will be used to create an intermediate CA which is not self-signed and restricted to certain domains.

Is there anything I should change in this config, whether to avoid bugs or to be more aligned with best practices?

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1 comment thread

"Name Constraints" (2 comments)
"Name Constraints"
Michael‭ wrote 9 months ago

Does GnuTLS support CA Name Constraints, so you can limit the valid domains directly in the root CA?

It has the nc_permit_dns option (nc = name constraint?). In the past, when I tried this, I got errors about how a root CA can't have NC. But I just tried adding it and it works. Would you like to post this as an answer so I can upvote/mark worked?