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#!/bin/bash
# Copyright 2014 The Kubernetes Authors.
#
# 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 nounset
set -o pipefail
DEBUG="${DEBUG:-false}"
if [ "${DEBUG}" == "true" ]; then
set -x
fi
cert_ip=$1
extra_sans=${2:-}
cert_dir=${CERT_DIR:-/srv/kubernetes}
cert_group=${CERT_GROUP:-kube-cert}
mkdir -p "$cert_dir"
use_cn=false
# TODO: Add support for discovery on other providers?
if [ "$cert_ip" == "_use_gce_external_ip_" ]; then
cert_ip=$(curl -s -H Metadata-Flavor:Google http://metadata.google.internal./computeMetadata/v1/instance/network-interfaces/0/access-configs/0/external-ip)
fi
if [ "$cert_ip" == "_use_aws_external_ip_" ]; then
# If there's no public IP assigned (e.g. this host is running on an internal subnet in a VPC), then
# curl will happily spit out the contents of AWS's 404 page and an exit code of zero.
#
# The string containing the 404 page trips up one of easyrsa's calls to openssl later; whichever
# one creates the CA certificate, because the 404 page is > 64 characters.
if cert_ip=$(curl -f -s http://169.254.169.254/latest/meta-data/public-ipv4); then
:
else
cert_ip=$(curl -f -s http://169.254.169.254/latest/meta-data/local-ipv4)
fi
fi
if [ "$cert_ip" == "_use_azure_dns_name_" ]; then
cert_ip=$(uname -n | awk -F. '{ print $2 }').cloudapp.net
use_cn=true
fi
sans="IP:${cert_ip}"
if [[ -n "${extra_sans}" ]]; then
sans="${sans},${extra_sans}"
fi
tmpdir=$(mktemp -d -t kubernetes_cacert.XXXXXX)
trap 'rm -rf "${tmpdir}"' EXIT
cd "${tmpdir}"
# TODO: For now, this is a patched tool that makes subject-alt-name work, when
# the fix is upstream move back to the upstream easyrsa. This is cached in GCS
# but is originally taken from:
# https://github.com/brendandburns/easy-rsa/archive/master.tar.gz
#
# To update, do the following:
# curl -o easy-rsa.tar.gz https://github.com/brendandburns/easy-rsa/archive/master.tar.gz
# gsutil cp easy-rsa.tar.gz gs://kubernetes-release/easy-rsa/easy-rsa.tar.gz
# gsutil acl ch -R -g all:R gs://kubernetes-release/easy-rsa/easy-rsa.tar.gz
#
# Due to GCS caching of public objects, it may take time for this to be widely
# distributed.
#
# Use ~/kube/easy-rsa.tar.gz if it exists, so that it can be
# pre-pushed in cases where an outgoing connection is not allowed.
if [ -f ~/kube/easy-rsa.tar.gz ]; then
ln -s ~/kube/easy-rsa.tar.gz .
else
curl -L -O https://storage.googleapis.com/kubernetes-release/easy-rsa/easy-rsa.tar.gz > /dev/null 2>&1
fi
tar xzf easy-rsa.tar.gz > /dev/null 2>&1
cd easy-rsa-master/easyrsa3
./easyrsa init-pki > /dev/null 2>&1
./easyrsa --batch "--req-cn=$cert_ip@`date +%s`" build-ca nopass > /dev/null 2>&1
if [ $use_cn = "true" ]; then
./easyrsa build-server-full $cert_ip nopass > /dev/null 2>&1
cp -p pki/issued/$cert_ip.crt "${cert_dir}/server.cert" > /dev/null 2>&1
cp -p pki/private/$cert_ip.key "${cert_dir}/server.key" > /dev/null 2>&1
else
./easyrsa --subject-alt-name="${sans}" build-server-full kubernetes-master nopass > /dev/null 2>&1
cp -p pki/issued/kubernetes-master.crt "${cert_dir}/server.cert" > /dev/null 2>&1
cp -p pki/private/kubernetes-master.key "${cert_dir}/server.key" > /dev/null 2>&1
fi
./easyrsa build-client-full kubecfg nopass > /dev/null 2>&1
cp -p pki/ca.crt "${cert_dir}/ca.crt"
cp -p pki/issued/kubecfg.crt "${cert_dir}/kubecfg.crt"
cp -p pki/private/kubecfg.key "${cert_dir}/kubecfg.key"
# Make server certs accessible to apiserver.
chgrp $cert_group "${cert_dir}/server.key" "${cert_dir}/server.cert" "${cert_dir}/ca.crt"
chmod 660 "${cert_dir}/server.key" "${cert_dir}/server.cert" "${cert_dir}/ca.crt"