108 lines
3.4 KiB
Bash
108 lines
3.4 KiB
Bash
#!/bin/bash
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# Author: skahlouc@skahlouc-laptop
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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set -o errexit
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set -o pipefail
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usage()
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{
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cat << EOF
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Create self signed certificates
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Usage : $(basename $0) -f <config> [-c <cloud_provider>] [-d <ssldir>] [-g <ssl_group>]
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-h | --help : Show this message
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-f | --config : Openssl configuration file
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-c | --cloud : Cloud provider (GCE, AWS or AZURE)
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-d | --ssldir : Directory where the certificates will be installed
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-g | --sslgrp : Group of the certificates
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ex :
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$(basename $0) -f openssl.conf -c GCE -d /srv/ssl -g kube
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EOF
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}
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# Options parsing
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while (($#)); do
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case "$1" in
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-h | --help) usage; exit 0;;
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-f | --config) CONFIG=${2}; shift 2;;
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-c | --cloud) CLOUD=${2}; shift 2;;
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-d | --ssldir) SSLDIR="${2}"; shift 2;;
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-g | --group) SSLGRP="${2}"; shift 2;;
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*)
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usage
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echo "ERROR : Unknown option"
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exit 3
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;;
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esac
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done
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if [ -z ${CONFIG} ]; then
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echo "ERROR: the openssl configuration file is missing. option -f"
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exit 1
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fi
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if [ -z ${SSLDIR} ]; then
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SSLDIR="/etc/kubernetes/certs"
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fi
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if [ -z ${SSLGRP} ]; then
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SSLGRP="kube-cert"
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fi
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#echo "config=$CONFIG, cloud=$CLOUD, certdir=$SSLDIR, certgroup=$SSLGRP"
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SUPPORTED_CLOUDS="GCE AWS AZURE"
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# TODO: Add support for discovery on other providers?
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if [ "${CLOUD}" == "GCE" ]; then
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CLOUD_IP=$(curl -s -H Metadata-Flavor:Google http://metadata.google.internal./computeMetadata/v1/instance/network-interfaces/0/access-configs/0/external-ip)
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fi
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if [ "${CLOUD}" == "AWS" ]; then
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CLOUD_IP=$(curl -s http://169.254.169.254/latest/meta-data/public-ipv4)
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fi
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if [ "${CLOUD}" == "AZURE" ]; then
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CLOUD_IP=$(uname -n | awk -F. '{ print $2 }').cloudapp.net
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fi
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tmpdir=$(mktemp -d --tmpdir kubernetes_cacert.XXXXXX)
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trap 'rm -rf "${tmpdir}"' EXIT
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cd "${tmpdir}"
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mkdir -p "${SSLDIR}"
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# Root CA
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openssl genrsa -out ca-key.pem 2048 > /dev/null 2>&1
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openssl req -x509 -new -nodes -key ca-key.pem -days 10000 -out ca.pem -subj "/CN=kube-ca" > /dev/null 2>&1
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# Apiserver
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openssl genrsa -out apiserver-key.pem 2048 > /dev/null 2>&1
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openssl req -new -key apiserver-key.pem -out apiserver.csr -subj "/CN=kube-apiserver" -config ${CONFIG} > /dev/null 2>&1
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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
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# Nodes and Admin
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for i in node admin; do
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openssl genrsa -out ${i}-key.pem 2048 > /dev/null 2>&1
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openssl req -new -key ${i}-key.pem -out ${i}.csr -subj "/CN=kube-${i}" > /dev/null 2>&1
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openssl x509 -req -in ${i}.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out ${i}.pem -days 365 > /dev/null 2>&1
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done
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# Install certs
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mv *.pem ${SSLDIR}/
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chgrp ${SSLGRP} ${SSLDIR}/*
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chmod 600 ${SSLDIR}/*-key.pem
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chown root:root ${SSLDIR}/*-key.pem
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