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#!/bin/bash
#
# 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.
set -o errexit
set -o pipefail
usage()
{
cat << EOF
Create self signed certificates
Usage : $(basename $0) -f <config> [-d <ssldir>]
-h | --help : Show this message
-f | --config : Openssl configuration file
-d | --ssldir : Directory where the certificates will be installed
ex :
$(basename $0) -f openssl.conf -d /srv/ssl
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EOF
}
# Options parsing
while (($#)); do
case "$1" in
-h | --help) usage; exit 0;;
-f | --config) CONFIG=${2}; shift 2;;
-d | --ssldir) SSLDIR="${2}"; shift 2;;
*)
usage
echo "ERROR : Unknown option"
exit 3
;;
esac
done
if [ -z ${CONFIG} ]; then
echo "ERROR: the openssl configuration file is missing. option -f"
exit 1
fi
if [ -z ${SSLDIR} ]; then
SSLDIR="/etc/kubernetes/certs"
fi
tmpdir=$(mktemp -d --tmpdir kubernetes_cacert.XXXXXX)
trap 'rm -rf "${tmpdir}"' EXIT
cd "${tmpdir}"
mkdir -p "${SSLDIR}"
# Root CA
openssl genrsa -out ca-key.pem 2048 > /dev/null 2>&1
openssl req -x509 -new -nodes -key ca-key.pem -days 10000 -out ca.pem -subj "/CN=kube-ca" > /dev/null 2>&1
# Apiserver
openssl genrsa -out apiserver-key.pem 2048 > /dev/null 2>&1
openssl req -new -key apiserver-key.pem -out apiserver.csr -subj "/CN=kube-apiserver" -config ${CONFIG} > /dev/null 2>&1
openssl x509 -req -in apiserver.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out apiserver.pem -days 365 -extensions v3_req -extfile ${CONFIG} > /dev/null 2>&1
# Nodes and Admin
for i in node admin; do
openssl genrsa -out ${i}-key.pem 2048 > /dev/null 2>&1
openssl req -new -key ${i}-key.pem -out ${i}.csr -subj "/CN=kube-${i}" > /dev/null 2>&1
openssl x509 -req -in ${i}.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out ${i}.pem -days 365 > /dev/null 2>&1
done
# Install certs
mv *.pem ${SSLDIR}/