Ability to define SSL certificates duration and SSL key size (#3482)

* Ability to specify ssl certificate duration and ssl key size - etcd/secrets * Ability to specify ssl certificate duration and ssl key size - helm/contiv + fix contiv missing copy certs generation script
2026-03-08 11:07:43 +03:00 · 2018-10-09 13:43:30 +02:00
parent c825f4d180
commit 2ab2f3a0a3
9 changed files with 42 additions and 28 deletions
--- a/roles/kubernetes/secrets/templates/make-ssl.sh.j2
+++ b/roles/kubernetes/secrets/templates/make-ssl.sh.j2
@@ -0,0 +1,151 @@
+#!/bin/bash
+
+# Author: Smana smainklh@gmail.com
+#
+# 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
+
+      Environmental variables MASTERS and HOSTS should be set to generate keys
+      for each host.
+
+           ex :
+           MASTERS=node1 HOSTS="node1 node2" $(basename $0) -f openssl.conf -d /srv/ssl
+EOF
+}
+
+# Options parsing
+while (($#)); 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 /tmp/kubernetes_cacert.XXXXXX)
+trap 'rm -rf "${tmpdir}"' EXIT
+cd "${tmpdir}"
+
+mkdir -p "${SSLDIR}"
+
+# Root CA
+if [ -e "$SSLDIR/ca-key.pem" ]; then
+    # Reuse existing CA
+    cp $SSLDIR/{ca.pem,ca-key.pem} .
+else
+    openssl genrsa -out ca-key.pem {{certificates_key_size}} > /dev/null 2>&1
+    openssl req -x509 -new -nodes -key ca-key.pem -days {{certificates_duration}} -out ca.pem -subj "/CN=kube-ca" > /dev/null 2>&1
+fi
+
+# Front proxy client CA
+if [ -e "$SSLDIR/front-proxy-ca-key.pem" ]; then
+    # Reuse existing front proxy CA
+    cp $SSLDIR/{front-proxy-ca.pem,front-proxy-ca-key.pem} .
+else
+    openssl genrsa -out front-proxy-ca-key.pem {{certificates_key_size}} > /dev/null 2>&1
+    openssl req -x509 -new -nodes -key front-proxy-ca-key.pem -days {{certificates_duration}} -out front-proxy-ca.pem -subj "/CN=front-proxy-ca" > /dev/null 2>&1
+fi
+
+gen_key_and_cert() {
+    local name=$1
+    local subject=$2
+    openssl genrsa -out ${name}-key.pem {{certificates_key_size}} > /dev/null 2>&1
+    openssl req -new -key ${name}-key.pem -out ${name}.csr -subj "${subject}" -config ${CONFIG} > /dev/null 2>&1
+    openssl x509 -req -in ${name}.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out ${name}.pem -days {{certificates_duration}} -extensions v3_req -extfile ${CONFIG} > /dev/null 2>&1
+}
+
+gen_key_and_cert_front_proxy() {
+    local name=$1
+    local subject=$2
+    openssl genrsa -out ${name}-key.pem {{certificates_key_size}} > /dev/null 2>&1
+    openssl req -new -key ${name}-key.pem -out ${name}.csr -subj "${subject}" -config ${CONFIG} > /dev/null 2>&1
+    openssl x509 -req -in ${name}.csr -CA front-proxy-ca.pem -CAkey front-proxy-ca-key.pem -CAcreateserial -out ${name}.pem -days {{certificates_duration}} -extensions v3_req -extfile ${CONFIG} > /dev/null 2>&1
+}
+
+# Admins
+if [ -n "$MASTERS" ]; then
+
+    # service-account
+    # If --service-account-private-key-file was previously configured to use apiserver-key.pem then copy that to the new dedicated service-account signing key location to avoid disruptions
+    if [ -e "$SSLDIR/apiserver-key.pem" ] && ! [ -e "$SSLDIR/service-account-key.pem" ]; then
+       cp $SSLDIR/apiserver-key.pem $SSLDIR/service-account-key.pem
+    fi
+    # Generate dedicated service account signing key if one doesn't exist
+    if ! [ -e "$SSLDIR/apiserver-key.pem" ] && ! [ -e "$SSLDIR/service-account-key.pem" ]; then
+        openssl genrsa -out service-account-key.pem {{certificates_key_size}} > /dev/null 2>&1
+    fi
+
+    # kube-apiserver
+    # Generate only if we don't have existing ca and apiserver certs
+    if ! [ -e "$SSLDIR/ca-key.pem" ] || ! [ -e "$SSLDIR/apiserver-key.pem" ]; then
+      gen_key_and_cert "apiserver" "/CN=kube-apiserver"
+      cat ca.pem >> apiserver.pem
+    fi
+    # If any host requires new certs, just regenerate scheduler and controller-manager master certs
+    # kube-scheduler
+    gen_key_and_cert "kube-scheduler" "/CN=system:kube-scheduler"
+    # kube-controller-manager
+    gen_key_and_cert "kube-controller-manager" "/CN=system:kube-controller-manager"
+    # metrics aggregator
+    gen_key_and_cert_front_proxy "front-proxy-client" "/CN=front-proxy-client"
+
+    for host in $MASTERS; do
+        cn="${host}"
+        # admin
+        gen_key_and_cert "admin-${host}" "/CN=kube-admin-${cn}/O=system:masters"
+    done
+fi
+
+# Nodes
+if [ -n "$HOSTS" ]; then
+    for host in $HOSTS; do
+        cn="${host}"
+        gen_key_and_cert "node-${host}" "/CN=system:node:${cn,,}/O=system:nodes"
+    done
+fi
+
+# system:node-proxier
+if [ -n "$HOSTS" ]; then
+    for host in $HOSTS; do
+        # kube-proxy
+        gen_key_and_cert "kube-proxy-${host}" "/CN=system:kube-proxy/O=system:node-proxier"
+    done
+fi
+
+# Install certs
+mv *.pem ${SSLDIR}/