04fbe42aa6
the openssl tools will fail to create signing requests because the CN is too long. This is mainly a problem when FQDNs are used in the inventory file. THis will truncate the hostname for the CN field only at the first dot. This should handle the issue for most cases.
105 lines
3.3 KiB
Bash
Executable file
105 lines
3.3 KiB
Bash
Executable file
#!/bin/bash
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# Author: Smana smainklh@gmail.com
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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> [-d <ssldir>]
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-h | --help : Show this message
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-f | --config : Openssl configuration file
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-d | --ssldir : Directory where the certificates will be installed
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Environmental variables MASTERS and HOSTS should be set to generate keys
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for each host.
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ex :
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MASTERS=node1 HOSTS="node1 node2" $(basename $0) -f openssl.conf -d /srv/ssl
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EOF
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}
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# Options parsing
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while (($#)); 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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-d | --ssldir) SSLDIR="${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 ${SSLDIR} ]; then
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SSLDIR="/etc/kubernetes/certs"
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fi
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tmpdir=$(mktemp -d /tmp/kubernetes_cacert.XXXXXX)
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trap 'rm -rf "${tmpdir}"' EXIT
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cd "${tmpdir}"
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mkdir -p "${SSLDIR}"
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# Root CA
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if [ -e "$SSLDIR/ca-key.pem" ]; then
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# Reuse existing CA
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cp $SSLDIR/{ca.pem,ca-key.pem} .
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else
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openssl genrsa -out ca-key.pem 2048 > /dev/null 2>&1
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openssl req -x509 -new -nodes -key ca-key.pem -days 10000 -out ca.pem -subj "/CN=kube-ca" > /dev/null 2>&1
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fi
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if [ ! -e "$SSLDIR/ca-key.pem" ]; then
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# kube-apiserver key
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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 ${CONFIG} > /dev/null 2>&1
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cat ca.pem >> apiserver.pem
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fi
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if [ -n "$MASTERS" ]; then
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for host in $MASTERS; do
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cn="${host%%.*}"
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# admin key
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openssl genrsa -out admin-${host}-key.pem 2048 > /dev/null 2>&1
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openssl req -new -key admin-${host}-key.pem -out admin-${host}.csr -subj "/CN=kube-admin-${cn}" > /dev/null 2>&1
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openssl x509 -req -in admin-${host}.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out admin-${host}.pem -days 365 > /dev/null 2>&1
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done
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fi
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# Nodes and Admin
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if [ -n "$HOSTS" ]; then
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for host in $HOSTS; do
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cn="${host%%.*}"
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# node key
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openssl genrsa -out node-${host}-key.pem 2048 > /dev/null 2>&1
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openssl req -new -key node-${host}-key.pem -out node-${host}.csr -subj "/CN=kube-node-${cn}" > /dev/null 2>&1
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openssl x509 -req -in node-${host}.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out node-${host}.pem -days 365 > /dev/null 2>&1
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done
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fi
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# Install certs
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mv *.pem ${SSLDIR}/
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