install-letsencrypt-in-jdk.sh

#!/bin/bash
# This script add letsencrypt certs to $JAVA_HOME/jre/lib/security/cacerts
# see https://community.letsencrypt.org/t/will-the-cross-root-cover-trust-by-the-default-list-in-the-jdk-jre/134/22

JAVA_HOME=${1-text}
[ $# -eq 0 ] && { echo "Usage: sudo $0 \$JAVA_HOME" ; exit 1; }

KEYSTORE=$JAVA_HOME/jre/lib/security/cacerts

alias keytool=$JAVA_HOME/bin/keytool

wget https://letsencrypt.org/certs/isrgrootx1.pem
wget https://letsencrypt.org/certs/lets-encrypt-x3-cross-signed.der

# to be idempotent
keytool -delete -alias isrgrootx1 -keystore $KEYSTORE -storepass changeit 2> /dev/null
keytool -delete -alias letsencryptauthorityx3 -keystore $KEYSTORE -storepass changeit 2> /dev/null

keytool -trustcacerts -keystore $KEYSTORE -storepass changeit -noprompt -importcert -alias isrgrootx1 -file isrgrootx1.pem
keytool -trustcacerts -keystore $KEYSTORE -storepass changeit -noprompt -importcert -alias letsencryptauthorityx3 -file lets-encrypt-x3-cross-signed.der

rm isrgrootx1.pem lets-encrypt-x3-cross-signed.der