mirror of https://github.com/k3s-io/k3s
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
135 lines
4.9 KiB
135 lines
4.9 KiB
#!/usr/bin/env bash
|
|
set -e
|
|
umask 027
|
|
|
|
# Example K3s self-signed CA rotation script.
|
|
#
|
|
# This script will generate new self-signed root CA certificates, and cross-sign them with the
|
|
# current self-signed root CA certificates. It will then generate new leaf CA certificates
|
|
# signed by the new self-signed/cross-signed root CAs. The resulting cluster CA bundle will
|
|
# allow existing certificates to be trusted up until the original root CAs expire.
|
|
#
|
|
CONFIG="
|
|
[v3_ca]
|
|
subjectKeyIdentifier = hash
|
|
authorityKeyIdentifier = keyid:always,issuer:always
|
|
basicConstraints=CA:true"
|
|
TIMESTAMP=$(date +%s)
|
|
PRODUCT="${PRODUCT:-k3s}"
|
|
DATA_DIR="${DATA_DIR:-/var/lib/rancher/${PRODUCT}}"
|
|
TEMP_DIR="${DATA_DIR}/server/rotate-ca"
|
|
|
|
if type -t openssl-3 &>/dev/null; then
|
|
OPENSSL=openssl-3
|
|
else
|
|
OPENSSL=openssl
|
|
fi
|
|
|
|
echo "Using $(type -p ${OPENSSL}): $(${OPENSSL} version)"
|
|
|
|
if ! ${OPENSSL} ecparam -name prime256v1 -genkey -out /dev/null &>/dev/null; then
|
|
echo "openssl not found or missing Elliptic Curve (ecparam) support."
|
|
exit 1
|
|
fi
|
|
|
|
${OPENSSL} version | grep -qF 'OpenSSL 3' && OPENSSL_GENRSA_FLAGS=-traditional
|
|
|
|
mkdir -p ${TEMP_DIR}/tls/etcd
|
|
cd ${TEMP_DIR}/tls
|
|
|
|
# Set up temporary openssl configuration
|
|
mkdir -p ".ca/certs"
|
|
trap "rm -rf .ca" EXIT
|
|
touch .ca/index
|
|
openssl rand -hex 8 > .ca/serial
|
|
cat >.ca/config <<'EOF'
|
|
[ca]
|
|
default_ca = ca_default
|
|
[ca_default]
|
|
dir = ./.ca
|
|
database = $dir/index
|
|
serial = $dir/serial
|
|
new_certs_dir = $dir/certs
|
|
default_md = sha256
|
|
policy = policy_anything
|
|
[policy_anything]
|
|
commonName = supplied
|
|
[req]
|
|
distinguished_name = req_distinguished_name
|
|
[req_distinguished_name]
|
|
[v3_ca]
|
|
subjectKeyIdentifier = hash
|
|
authorityKeyIdentifier = keyid:always
|
|
basicConstraints = critical, CA:true
|
|
keyUsage = critical, digitalSignature, keyEncipherment, keyCertSign
|
|
EOF
|
|
|
|
for TYPE in client server request-header etcd/peer etcd/server; do
|
|
if [ ! -f ${DATA_DIR}/server/tls/${TYPE}-ca.crt ]; then
|
|
echo "Current ${TYPE} CA cert does not exist; cannot continue"
|
|
exit 1
|
|
fi
|
|
|
|
if [ "$(grep -cF 'END CERTIFICATE' ${DATA_DIR}/server/tls/${TYPE}-ca.crt)" -gt "1" ]; then
|
|
awk 'BEGIN { RS = "-----END CERTIFICATE-----\n" } NR==2 { print $0 RS }' ${DATA_DIR}/server/tls/${TYPE}-ca.crt > ${TYPE}-root-old.pem
|
|
awk 'BEGIN { RS = "-----END EC PRIVATE KEY-----\n" } NR==2 { print $0 RS }' ${DATA_DIR}/server/tls/${TYPE}-ca.key > ${TYPE}-root-old.key
|
|
else
|
|
cat ${DATA_DIR}/server/tls/${TYPE}-ca.crt > ${TYPE}-root-old.pem
|
|
cat ${DATA_DIR}/server/tls/${TYPE}-ca.key > ${TYPE}-root-old.key
|
|
fi
|
|
|
|
CERT_NAME="${PRODUCT}-$(echo ${TYPE} | tr / -)-root"
|
|
echo "Generating ${CERT_NAME} root and cross-signed certificate authority key and certificates"
|
|
${OPENSSL} ecparam -name prime256v1 -genkey -noout -out ${TYPE}-root.key
|
|
${OPENSSL} req -x509 -new -nodes -sha256 -days 7300 \
|
|
-subj "/CN=${CERT_NAME}@${TIMESTAMP}" \
|
|
-key ${TYPE}-root.key \
|
|
-out ${TYPE}-root-ssigned.pem \
|
|
-config ./.ca/config \
|
|
-extensions v3_ca
|
|
${OPENSSL} req -new -nodes \
|
|
-subj "/CN=${CERT_NAME}@${TIMESTAMP}" \
|
|
-key ${TYPE}-root.key |
|
|
${OPENSSL} ca -batch -notext -days 7300 \
|
|
-in /dev/stdin \
|
|
-out ${TYPE}-root-xsigned.pem \
|
|
-keyfile ${TYPE}-root-old.key \
|
|
-cert ${TYPE}-root-old.pem \
|
|
-config ./.ca/config \
|
|
-extensions v3_ca
|
|
CERT_NAME="${PRODUCT}-$(echo ${TYPE} | tr / -)-ca"
|
|
echo "Generating ${CERT_NAME} intermediate certificate authority key and certificates"
|
|
${OPENSSL} ecparam -name prime256v1 -genkey -noout -out ${TYPE}-ca.key
|
|
${OPENSSL} req -new -nodes \
|
|
-subj "/CN=${CERT_NAME}@${TIMESTAMP}" \
|
|
-key ${TYPE}-ca.key |
|
|
${OPENSSL} ca -batch -notext -days 7300 \
|
|
-in /dev/stdin \
|
|
-out ${TYPE}-ca.pem \
|
|
-keyfile ${TYPE}-root.key \
|
|
-cert ${TYPE}-root-ssigned.pem \
|
|
-config ./.ca/config \
|
|
-extensions v3_ca
|
|
|
|
cat ${TYPE}-ca.pem \
|
|
${TYPE}-root-ssigned.pem \
|
|
${TYPE}-root-xsigned.pem \
|
|
${TYPE}-root-old.pem > ${TYPE}-ca.crt
|
|
cat ${TYPE}-root.key >> ${TYPE}-ca.key
|
|
done
|
|
|
|
${OPENSSL} genrsa ${OPENSSL_GENRSA_FLAGS:-} -out service.key 2048
|
|
cat ${DATA_DIR}/server/tls/service.key >> service.key
|
|
|
|
export SERVER_CA_HASH=$(${OPENSSL} x509 -noout -fingerprint -sha256 -in server-ca.pem | awk -F= '{ gsub(/:/, "", $2); print tolower($2) }')
|
|
SERVER_TOKEN=$(awk -F:: '{print "K10" ENVIRON["SERVER_CA_HASH"] FS $2}' ${DATA_DIR}/server/token)
|
|
AGENT_TOKEN=$(awk -F:: '{print "K10" ENVIRON["SERVER_CA_HASH"] FS $2}' ${DATA_DIR}/server/agent-token)
|
|
|
|
echo
|
|
echo "Cross-signed CA certs and keys now available in ${TEMP_DIR}"
|
|
echo "Updated server token: ${SERVER_TOKEN}"
|
|
echo "Updated agent token: ${AGENT_TOKEN}"
|
|
echo
|
|
echo "To update certificates, you may now run:"
|
|
echo " k3s certificate rotate-ca --path=${TEMP_DIR}"
|