Generate tiller certs

gencert.sh

#!/usr/bin/env bash

# Copyright 2016 The Kubernetes Authors All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Bash 'Strict Mode'
# http://redsymbol.net/articles/unofficial-bash-strict-mode
set -euo pipefail
IFS=$'\n\t'

HELM_HOME="${HELM_HOME:-$(helm home)}"
DOMAIN="${DOMAIN:-localhost}"

cleanup() {
  rm -rf "${TMP}"
}
trap cleanup EXIT

TMP="${HELM_HOME}/tmp"
mkdir -p "${TMP}"
pushd "${TMP}" > /dev/null

echo "Generating CA private and public keys"
openssl genrsa -aes256 -out ca-key.pem 4096
openssl req -new -x509 -days 365 -key ca-key.pem -sha256 -out ca.pem

echo "\nCreating server key and certificate signing request (CSR)"
openssl genrsa -out server-key.pem 4096
openssl req -subj "/CN=$DOMAIN" -sha256 -new -key server-key.pem -out server.csr
echo subjectAltName = DNS:$DOMAIN,IP:127.0.0.1 > extfile.cnf
openssl x509 -req -days 365 -sha256 -in server.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out server-cert.pem -extfile extfile.cnf

echo "\nCreating client key and certificate signing request (CSR)"
openssl genrsa -out key.pem 4096
openssl req -subj '/CN=client' -new -key key.pem -out client.csr
echo extendedKeyUsage = clientAuth > extfile.cnf
openssl x509 -req -days 365 -sha256 -in client.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out cert.pem -extfile extfile.cnf

echo "\nCoping CA, key, and cert to helm home"
cp -v {ca,key,cert}.pem "${HELM_HOME}"

popd > /dev/null

cat << EOF

To initialize tiller using tls:

  helm init --tiller-tls-verify

Test the connection after the pod is running:

  helm version --tls-verify

EOF