nixcfg/genpki.sh

#!/bin/bash

set -xe

# Enter proper cluster subdirectory

cd $(dirname $0)

CLUSTER="$1"
if [ -z "$CLUSTER" ] || [ ! -d "cluster/$CLUSTER" ]; then
	echo "Usage: $0 <cluster name>"
	echo "The cluster name must be the name of a subdirectory of cluster/"
	exit 1
fi

cd cluster/$CLUSTER

mkdir -p secrets/pki
cd secrets/pki

# Do actual stuff

YEAR=$(date +%Y)
for APP in consul nomad; do
	# 1. Create certificate authority
	if [ ! -f $APP-ca.key ]; then
		echo "Generating $APP CA keys..."
		#openssl genpkey -algorithm ED25519 -out $APP-ca.key
		openssl genrsa -out $APP-ca.key 4096

		openssl req -x509 -new -nodes -key $APP-ca.key -sha256 -days 3650 -out $APP-ca.crt -subj "/C=FR/O=Deuxfleurs/CN=$APP"
	fi

	CERT="${APP}${YEAR}"

	# 2. Create and sign certificates for inter-node communication
	if [ ! -f $CERT.crt ]; then
		echo "Generating $CERT agent keys..."
		if [ ! -f $CERT.key ]; then
			#openssl genpkey -algorithm ED25519 -out $CERT.key
			openssl genrsa -out $CERT.key 4096
		fi
		openssl req -new -sha256 -key $CERT.key \
			-subj "/C=FR/O=Deuxfleurs/CN=$APP" \
			-out $CERT.csr
		openssl req -in $CERT.csr -noout -text
		openssl x509 -req -in $CERT.csr \
			-extensions v3_req \
			-extfile <(cat <<EOF
[req]
distinguished_name = req_distinguished_name
req_extensions = v3_req
prompt = no

[req_distinguished_name]
C = FR
O = Deuxfleurs
CN = $APP

[v3_req]
keyUsage = keyEncipherment, keyCertSign, dataEncipherment
extendedKeyUsage = serverAuth, clientAuth
subjectAltName = @alt_names

[alt_names]
DNS.1 = server.$CLUSTER.$APP
DNS.2 = client.$CLUSTER.$APP
DNS.3 = localhost
DNS.4 = 127.0.0.1
EOF
	) \
			-CA $APP-ca.crt -CAkey $APP-ca.key -CAcreateserial \
			-out $CERT.crt -days 700
		rm $CERT.csr
	fi

	# 3. Create client-only certificate used for the CLI
	if [ ! -f $CERT-client.crt ]; then
		echo "Generating $CERT client keys..."
		if [ ! -f $CERT-client.key ]; then
			#openssl genpkey -algorithm ED25519 -out $CERT-client.key
			openssl genrsa -out $CERT-client.key 4096
		fi
		openssl req -new -sha256 -key $CERT-client.key \
			-subj "/C=FR/O=Deuxfleurs/CN=$APP-client" \
			-out $CERT-client.csr
		openssl req -in $CERT-client.csr -noout -text
		openssl x509 -req -in $CERT-client.csr \
			-extensions v3_req \
			-extfile <(cat <<EOF
[req]
distinguished_name = req_distinguished_name
req_extensions = v3_req
prompt = no

[req_distinguished_name]
C = FR
O = Deuxfleurs
CN = $APP-client

[v3_req]
keyUsage = keyEncipherment, keyCertSign, dataEncipherment
extendedKeyUsage = clientAuth
subjectAltName = @alt_names

[alt_names]
DNS.1 = client.$CLUSTER.$APP
EOF
	) \
			-CA $APP-ca.crt -CAkey $APP-ca.key -CAcreateserial \
			-out $CERT-client.crt -days 700
		rm $CERT-client.csr
	fi

	#if [ ! -f $CERT-client.p12 ]; then
	#	openssl pkcs12 -export -out $CERT-client.p12 \
	#		-in $APP-ca.pem -in $CERT-client.crt -inkey $CERT-client.key
	#fi
done