openssl - What is the difference between req_extensions in config and -extensions on command line? -


the sample openssl root ca config openssl cookbook defines following (p40):

[req] ... req_extensions = ca_ext  [ca_ext] ...

later (p43), root ca key generated, root ca selfsigned cert. 

openssl req -new \ -config root-ca.conf \ -out root-ca.csr \ -keyout private/root-ca.key  openssl ca -selfsign \ -config root-ca.conf \ -in root-ca.csr \ -out root-ca.crt \ -extensions ca_ext

isn't req_extensions redundant in specific use case? when req_extension needed?

req_extensions used declaring request extensions included in pkcs #10 certificate signing request (csr) objects. extensions part of signed data in csr.
in general, ca, when creating , signing x.509 certificate in response csr, , depending on certificate profile, may or may not heed particular request extensions. need use generate csr use ca expects particular information conveyed in way.

openssl not copy any extensions pkcs #10 requests x.509 certificates; extensions certificates must explicitly declared. openssl x509 man page provides commentary:

extensions in certificates not transferred certificate requests , vice versa.

because using openssl ca, use of req_extensions indeed redundant.


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