Verify supported TLS cyphers

check-tls-cyphers.sh

ENDPOINT=example.com:443

# test all ciphers on all protocols
for v in ssl2 ssl3 tls1 tls1_1 tls1_2 tls1_3; do
  for c in $(openssl ciphers 'ALL:eNULL' | tr ':' ' '); do
    openssl s_client -connect "$ENDPOINT" \
        -cipher $c -$v < /dev/null > /dev/null 2>&1 &&
        echo -e "$v:\t$c"
  done
done

# list all cipher/protocol combinations supported by the openssl client
openssl ciphers -v

# print unique list of protocols supported
openssl ciphers -v | awk '{print $2}' | sort | uniq