I created a root CA and intermediate CA, then used the intermediate to sign a leaf cert, for the purpose of enabling SSL on various web servers in an internal network.
I'm trying to figure out if I need to distribute both the root and intermediate CA certs in my client truststores, or if I can get by with only distributing the root, as explained in: Do I put my subordinate (intermediate) or root CA certificate in my truststore?
Doing a quick test with curl against an https endpoint with a leaf cert, signed by the intermediate, it appears I need the full chain, e.g.:
curl --cacert chain.crt https://my-endpoint:8080/
When I tried with only the root CA, I got an error:
curl --cacert root.crt https://my-endpoint:8080/ curl: (60) SSL certificate problem: unable to get issuer certificate
Why do I need to provide curl the full chain instead of only the root CA? Do I need to create leaf certs with a special option to embed the full chain?
Edit: another answer that indicates I should only need the root: https://security.stackexchange.com/a/83875/117515
Edit 2: the webserver I'm testing against happens to be Vault – not sure if that's relevant but perhaps there's something wrong with the way that server is presenting its certificate; it needs to serve the full chain, right? How do I verify that it is or isn't serving the full chain?