Verify cert against CA chain openssl
Validate trust chain; note: -CAfile must hold intermediates+root in order
openssl verify -CAfile ca-chain.pem cert.pem
more openssl
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Match cert and private key
diff <(openssl x509 -in cert.pem -noout -modulus | md5sum) <(openssl rsa -in key.pem -noout -modulus | md5sum)
CSR + key in one shot
openssl req -new -newkey rsa:2048 -nodes -keyout key.pem -out req.csr -subj "/CN=<host>" -addext "subjectAltName=DNS:<host>"
Self-signed cert with SAN
openssl req -x509 -newkey rsa:2048 -nodes -keyout key.pem -out cert.pem -days 365 -subj "/CN=<host>" -addext "subjectAltName=DNS:<host>"
PEM to PKCS12 bundle
openssl pkcs12 -export -in cert.pem -inkey key.pem -certfile ca-chain.pem -out bundle.p12 -name <name>
STARTTLS protocol probe
openssl s_client -connect <host>:5432 -starttls postgres -showcerts </dev/null 2>/dev/null