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EMS/infra/ca/issue-client-cert.sh

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#!/usr/bin/env bash
# issue-client-cert.sh — Issue a client cert for one device.
#
# Usage: ./issue-client-cert.sh <device-name>
# Example: ./issue-client-cert.sh lutz-iphone
#
# Outputs <device-name>.p12 — install on the device after enrolling ca.crt.
# See enroll-iphone.md for the full iPhone enrollment flow.
set -euo pipefail
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
cd "$SCRIPT_DIR"
NAME="${1:?Usage: $0 <device-name> e.g.: $0 lutz-iphone}"
if [[ ! -f ca.key ]]; then
echo "ERROR: ca.key not found. Run gen-ca.sh first."
exit 1
fi
if [[ -f "${NAME}.p12" ]]; then
echo "WARNING: ${NAME}.p12 already exists. Overwriting."
fi
echo "Issuing client cert for: ${NAME}"
echo "You will be prompted for a PKCS12 export password."
echo "Use a strong password — you will need it during iPhone installation."
echo ""
openssl req -newkey rsa:2048 -nodes \
-keyout "${NAME}.key" \
-out "${NAME}.csr" \
-subj "/CN=${NAME}/O=FamFi/C=DE"
openssl x509 -req \
-in "${NAME}.csr" \
-CA ca.crt \
-CAkey ca.key \
-CAcreateserial \
-out "${NAME}.crt" \
-days 825 \
-sha256 \
-extfile <(printf "basicConstraints=CA:FALSE\nkeyUsage=critical,digitalSignature\nextendedKeyUsage=clientAuth\nsubjectKeyIdentifier=hash\nauthorityKeyIdentifier=keyid")
openssl pkcs12 -export \
-out "${NAME}.p12" \
-inkey "${NAME}.key" \
-in "${NAME}.crt" \
-certfile ca.crt \
-name "${NAME} EMS"
chmod 600 "${NAME}.key" "${NAME}.p12"
rm -f "${NAME}.csr" "${NAME}.crt"
echo ""
echo "Done: ${NAME}.p12"
echo "AirDrop to iPhone, then follow enroll-iphone.md."