nixcfg/gen_pki

#!/usr/bin/env sh

set -ex

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

PREFIX="deuxfleurs/cluster/$CLUSTER"

YEAR=$(date +%Y)
for APP in consul nomad; do
	# 1. Create certificate authority
	if ! pass $PREFIX/$APP-ca.key >/dev/null; then
		echo "Generating $APP CA keys..."
		openssl genrsa 4096 | pass insert -m $PREFIX/$APP-ca.key

		openssl req -x509 -new -nodes \
			-key <(pass $PREFIX/$APP-ca.key) -sha256 \
			-days 3650 -subj "/C=FR/O=Deuxfleurs/CN=$APP" \
			| pass insert -m -f $PREFIX/$APP-ca.crt
	fi

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

	# 2. Create and sign certificates for inter-node communication
	if ! pass $PREFIX/$CERT.crt >/dev/null; then
		echo "Generating $CERT agent keys..."
		if ! pass $PREFIX/$CERT.key >/dev/null; then
			openssl genrsa 4096 | pass insert -m $PREFIX/$CERT.key
		fi
		openssl req -new -sha256 -key <(pass $PREFIX/$CERT.key) \
			-subj "/C=FR/O=Deuxfleurs/CN=$APP" \
			-out /tmp/tmp-$CLUSTER-$CERT.csr
		openssl req -in /tmp/tmp-$CLUSTER-$CERT.csr  -noout -text
		openssl x509 -req -in /tmp/tmp-$CLUSTER-$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 = $APP.service.$CLUSTER.consul
DNS.4 = localhost
DNS.5 = 127.0.0.1
EOF
	) \
			-CA <(pass $PREFIX/$APP-ca.crt) \
			-CAkey <(pass $PREFIX/$APP-ca.key) -CAcreateserial \
			-CAserial /tmp/tmp-$CLUSTER-$CERT.srl \
			-days 700 \
			| pass insert -m $PREFIX/$CERT.crt
		rm /tmp/tmp-$CLUSTER-$CERT.{csr,srl}
	fi

	# 3. Create client-only certificate used for the CLI
	if ! pass $PREFIX/$CERT-client.crt >/dev/null; then
		echo "Generating $CERT client keys..."
		if ! pass $PREFIX/$CERT-client.key >/dev/null; then
			openssl genrsa 4096 | pass insert -m $PREFIX/$CERT-client.key
		fi
		openssl req -new -sha256 -key <(pass $PREFIX/$CERT-client.key) \
			-subj "/C=FR/O=Deuxfleurs/CN=$APP-client" \
			-out /tmp/tmp-$CLUSTER-$CERT-client.csr
		openssl req -in /tmp/tmp-$CLUSTER-$CERT-client.csr -noout -text
		openssl x509 -req -in /tmp/tmp-$CLUSTER-$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 <(pass $PREFIX/$APP-ca.crt) \
			-CAkey <(pass $PREFIX/$APP-ca.key) \
			-CAcreateserial -days 700 \
			-CAserial /tmp/tmp-$CLUSTER-$CERT-client.srl \
			| pass insert -m $PREFIX/$CERT-client.crt
		rm /tmp/tmp-$CLUSTER-$CERT-client.{csr,srl}
	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