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#!/bin/bash
#
# Copyright (c) 2024, The OpenThread Authors.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. Neither the name of the copyright holder nor the
# names of its contributors may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# Script to generate a TCAT Device X509v3 certificate.
if [ $# -ne 2 ]; then
echo "Usage: ./create-cert-tcat-device.sh <NameOfDevice> <NameOfCA>"
exit 1
fi
set -eu
# days certificate is valid
SECONDS1=$(date +%s) # time now
SECONDS2=$(date --date="2999-12-31 23:59:59Z" +%s) # target end time
((VALIDITY = "(${SECONDS2}-${SECONDS1})/(24*3600)"))
echo "create-cert-tcat-device.sh - Using validity param -days ${VALIDITY}"
NAME="${1}"
CANAME="${2}"
CACERTFILE="ca/${CANAME}_cert.pem"
((ID = ${NAME:0-1}))
((SERIAL = 13800 + ID))
echo " TCAT device name : ${NAME}"
echo " TCAT device CA name: ${CANAME}"
echo " Numeric serial ID : ${ID}"
# create csr for device.
# conform to 802.1AR guidelines, using only CN + serialNumber when
# manufacturer is already present as CA. CN is not even mandatory, but just good practice.
openssl req -new -key "keys/${NAME}_key.pem" -out "${NAME}.csr" -subj \
"/CN=TCAT Example ${NAME}/serialNumber=4723-9833-000${ID}"
# sign csr by CA
mkdir -p "output/${NAME}"
openssl x509 -set_serial "${SERIAL}" -CAform PEM -CA "${CACERTFILE}" \
-CAkey "ca/${CANAME}_key.pem" -extfile "ext/${NAME}.ext" -extensions \
"${NAME}" -req -in "${NAME}.csr" -out "output/${NAME}/device_cert.pem" \
-days "${VALIDITY}" -sha256
# delete temp files
rm -f "${NAME}.csr"
# copy supporting files, for immediate use by TCAT Commissioner as 'cert_path'.
# Normally a Commissioner must not use Device certs, but for testing purposes this
# option is provided here.
cp "output/${NAME}/device_cert.pem" "output/${NAME}/commissioner_cert.pem"
cp "${CACERTFILE}" "output/${NAME}/ca_cert.pem"
cp "keys/${NAME}_key.pem" "output/${NAME}/commissioner_key.pem"
cp "keys/${NAME}_key.pem" "output/${NAME}/device_key.pem"