#!/usr/bin/env bash set -e KEYSTORE_FILENAME="kafka.keystore.jks" VALIDITY_IN_DAYS=3650 DEFAULT_TRUSTSTORE_FILENAME="kafka.truststore.jks" TRUSTSTORE_WORKING_DIRECTORY="truststore" KEYSTORE_WORKING_DIRECTORY="keystore" CA_CERT_FILE="ca-cert" KEYSTORE_SIGN_REQUEST="cert-file" KEYSTORE_SIGN_REQUEST_SRL="ca-cert.srl" KEYSTORE_SIGNED_CERT="cert-signed" function file_exists_and_exit() { echo "'$1' cannot exist. Move or delete it before" echo "re-running this script." exit 1 } if [ -e "$KEYSTORE_WORKING_DIRECTORY" ]; then file_exists_and_exit $KEYSTORE_WORKING_DIRECTORY fi if [ -e "$CA_CERT_FILE" ]; then file_exists_and_exit $CA_CERT_FILE fi if [ -e "$KEYSTORE_SIGN_REQUEST" ]; then file_exists_and_exit $KEYSTORE_SIGN_REQUEST fi if [ -e "$KEYSTORE_SIGN_REQUEST_SRL" ]; then file_exists_and_exit $KEYSTORE_SIGN_REQUEST_SRL fi if [ -e "$KEYSTORE_SIGNED_CERT" ]; then file_exists_and_exit $KEYSTORE_SIGNED_CERT fi echo echo "Welcome to the Kafka SSL keystore and truststore generator script." echo echo "First, do you need to generate a trust store and associated private key," echo "or do you already have a trust store file and private key?" echo echo -n "Do you need to generate a trust store and associated private key? [yn] " read generate_trust_store trust_store_file="" trust_store_private_key_file="" if [ "$generate_trust_store" == "y" ]; then if [ -e "$TRUSTSTORE_WORKING_DIRECTORY" ]; then file_exists_and_exit $TRUSTSTORE_WORKING_DIRECTORY fi mkdir $TRUSTSTORE_WORKING_DIRECTORY echo echo "OK, we'll generate a trust store and associated private key." echo echo "First, the private key." echo echo "You will be prompted for:" echo " - A password for the private key. Remember this." echo " - Information about you and your company." echo " - NOTE that the Common Name (CN) is currently not important." openssl req -new -x509 -keyout $TRUSTSTORE_WORKING_DIRECTORY/ca-key \ -out $TRUSTSTORE_WORKING_DIRECTORY/$CA_CERT_FILE -days $VALIDITY_IN_DAYS trust_store_private_key_file="$TRUSTSTORE_WORKING_DIRECTORY/ca-key" echo echo "Two files were created:" echo " - $TRUSTSTORE_WORKING_DIRECTORY/ca-key -- the private key used later to" echo " sign certificates" echo " - $TRUSTSTORE_WORKING_DIRECTORY/$CA_CERT_FILE -- the certificate that will be" echo " stored in the trust store in a moment and serve as the certificate" echo " authority (CA). Once this certificate has been stored in the trust" echo " store, it will be deleted. It can be retrieved from the trust store via:" echo " $ keytool -keystore -export -alias CARoot -rfc" echo echo "Now the trust store will be generated from the certificate." echo echo "You will be prompted for:" echo " - the trust store's password (labeled 'keystore'). Remember this" echo " - a confirmation that you want to import the certificate" keytool -keystore $TRUSTSTORE_WORKING_DIRECTORY/$DEFAULT_TRUSTSTORE_FILENAME \ -alias CARoot -import -file $TRUSTSTORE_WORKING_DIRECTORY/$CA_CERT_FILE trust_store_file="$TRUSTSTORE_WORKING_DIRECTORY/$DEFAULT_TRUSTSTORE_FILENAME" echo echo "$TRUSTSTORE_WORKING_DIRECTORY/$DEFAULT_TRUSTSTORE_FILENAME was created." # don't need the cert because it's in the trust store. rm $TRUSTSTORE_WORKING_DIRECTORY/$CA_CERT_FILE else echo echo -n "Enter the path of the trust store file. " read -e trust_store_file if ! [ -f $trust_store_file ]; then echo "$trust_store_file isn't a file. Exiting." exit 1 fi echo -n "Enter the path of the trust store's private key. " read -e trust_store_private_key_file if ! [ -f $trust_store_private_key_file ]; then echo "$trust_store_private_key_file isn't a file. Exiting." exit 1 fi fi echo echo "Continuing with:" echo " - trust store file: $trust_store_file" echo " - trust store private key: $trust_store_private_key_file" mkdir $KEYSTORE_WORKING_DIRECTORY echo echo "Now, a keystore will be generated. Each broker and logical client needs its own" echo "keystore. This script will create only one keystore. Run this script multiple" echo "times for multiple keystores." echo echo "You will be prompted for the following:" echo " - A keystore password. Remember it." echo " - Personal information, such as your name." echo " NOTE: currently in Kafka, the Common Name (CN) does not need to be the FQDN of" echo " this host. However, at some point, this may change. As such, make the CN" echo " the FQDN. Some operating systems call the CN prompt 'first / last name'" echo " - A key password, for the key being generated within the keystore. Remember this." # To learn more about CNs and FQDNs, read: # https://docs.oracle.com/javase/7/docs/api/javax/net/ssl/X509ExtendedTrustManager.html keytool -keystore $KEYSTORE_WORKING_DIRECTORY/$KEYSTORE_FILENAME \ -alias localhost -validity $VALIDITY_IN_DAYS -genkey -keyalg RSA echo echo "'$KEYSTORE_WORKING_DIRECTORY/$KEYSTORE_FILENAME' now contains a key pair and a" echo "self-signed certificate. Again, this keystore can only be used for one broker or" echo "one logical client. Other brokers or clients need to generate their own keystores." echo echo "Fetching the certificate from the trust store and storing in $CA_CERT_FILE." echo echo "You will be prompted for the trust store's password (labeled 'keystore')" keytool -keystore $trust_store_file -export -alias CARoot -rfc -file $CA_CERT_FILE echo echo "Now a certificate signing request will be made to the keystore." echo echo "You will be prompted for the keystore's password." keytool -keystore $KEYSTORE_WORKING_DIRECTORY/$KEYSTORE_FILENAME -alias localhost \ -certreq -file $KEYSTORE_SIGN_REQUEST echo echo "Now the trust store's private key (CA) will sign the keystore's certificate." echo echo "You will be prompted for the trust store's private key password." openssl x509 -req -CA $CA_CERT_FILE -CAkey $trust_store_private_key_file \ -in $KEYSTORE_SIGN_REQUEST -out $KEYSTORE_SIGNED_CERT \ -days $VALIDITY_IN_DAYS -CAcreateserial # creates $KEYSTORE_SIGN_REQUEST_SRL which is never used or needed. echo echo "Now the CA will be imported into the keystore." echo echo "You will be prompted for the keystore's password and a confirmation that you want to" echo "import the certificate." keytool -keystore $KEYSTORE_WORKING_DIRECTORY/$KEYSTORE_FILENAME -alias CARoot \ -import -file $CA_CERT_FILE rm $CA_CERT_FILE # delete the trust store cert because it's stored in the trust store. echo echo "Now the keystore's signed certificate will be imported back into the keystore." echo echo "You will be prompted for the keystore's password." keytool -keystore $KEYSTORE_WORKING_DIRECTORY/$KEYSTORE_FILENAME -alias localhost -import \ -file $KEYSTORE_SIGNED_CERT echo echo "All done!" echo echo "Delete intermediate files? They are:" echo " - '$KEYSTORE_SIGN_REQUEST_SRL': CA serial number" echo " - '$KEYSTORE_SIGN_REQUEST': the keystore's certificate signing request" echo " (that was fulfilled)" echo " - '$KEYSTORE_SIGNED_CERT': the keystore's certificate, signed by the CA, and stored back" echo " into the keystore" echo -n "Delete? [yn] " read delete_intermediate_files if [ "$delete_intermediate_files" == "y" ]; then rm $KEYSTORE_SIGN_REQUEST_SRL rm $KEYSTORE_SIGN_REQUEST rm $KEYSTORE_SIGNED_CERT fi