3

I have a self signed root CA certificate and key

I am trying to create a server certificate which will be signed by this CA

Here are the steps I took:

1) Generate a server key

openssl genrsa -out server.key 2048

2) Generate a signing request specifying 365 days

openssl req -new -key server.key -out server.csr -days 365 -sha256

3) Sign the request using the self signed CA

openssl x509 -req -in server.csr -CA CA.crt -CAkey CA.key -CAcreateserial -out server.crt -sha256

When I check my newly created cert as follows:

openssl x509 -noout -text -in server.crt

I can see this in the output:

Validity Not Before: May 8 14:19:44 2017 GMT Not After : Jun 7 14:19:44 2017 GMT

I'm not sure what I'm doing wrong here? Why didn't it create a cert with the correct expiration date even though I specified 365 days?

5

The certificate validity should be specified in the last step as in:

openssl x509 -req -in server.csr -CA CA.crt -CAkey CA.key -CAcreateserial -out server.crt -sha256 -days 365

Otherwise, while you are requesting 365 days while creating the CSR, when you sign it the signing default configuration overrides the days of the CSR request.

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