# make directories to work from
mkdir -p certs/{server,client,ca,tmp}
# Create your very own Root Certificate Authority
openssl genrsa \
-out certs/ca/my-root-ca.key.pem \
2048
# Self-sign your Root Certificate Authority
# Since this is private, the details can be as bogus as you like
openssl req \
-x509 \
-new \
-nodes \
-key certs/ca/my-root-ca.key.pem \
-days 1024 \
-out certs/ca/my-root-ca.crt.pem \
-subj "/C=US/ST=Utah/L=Provo/O=ACME Signing Authority Inc/CN=example.com"
# Create a Device Certificate for each domain,
# such as example.com, *.example.com, awesome.example.com
# NOTE: You MUST match CN to the domain name or ip address you want to use
openssl genrsa \
-out certs/server/my-server.key.pem \
2048
# Create a request from your Device, which your Root CA will sign
openssl req -new \
-key certs/server/my-server.key.pem \
-out certs/tmp/my-server.csr.pem \
-subj "/C=US/ST=Utah/L=Provo/O=ACME Tech Inc/CN=${FQDN}"
# Sign the request from Device with your Root CA
# -CAserial certs/ca/my-root-ca.srl
openssl x509 \
-req -in certs/tmp/my-server.csr.pem \
-CA certs/ca/my-root-ca.crt.pem \
-CAkey certs/ca/my-root-ca.key.pem \
-CAcreateserial \
-out certs/server/my-server.crt.pem \
-days 500
# Create a public key, for funzies
# see https://gist.github.com/coolaj86/f6f36efce2821dfb046d
openssl rsa \
-in certs/server/my-server.key.pem \
-pubout -out certs/client/my-server.pub
# Put things in their proper place
rsync -a certs/ca/my-root-ca.crt.pem certs/server/
rsync -a certs/ca/my-root-ca.crt.pem certs/client/