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#
# Copyright Jan Luebbe <jlu@pengutronix.de>
#
# SPDX-License-Identifier: MIT
#
# This class provides a common workflow to use asymmetric (i.e. RSA) keys to
# sign artifacts. Usually, the keys are either stored as simple files in the
# file system or on an HSM (Hardware Security Module). While files are easy to
# use, it's hard to verify that no copies of the private key have been made
# and only authorized persons are able to use the key. Use of an HSM addresses
# these risks by only allowing use of the key via an API (often PKCS #11). The
# standard way of referring to a specific key in an HSM are PKCS #11 URIs (RFC
# 7512).
#
# Many software projects support signing using PKCS #11 keys, but configuring
# this is very project specific. Furthermore, as physical HSMs are not very
# widespread, testing code signing in CI is not simple. To solve this at the
# build system level, this class takes the approach of always using PKCS #11 at
# the recipe level. For cases where the keys are available as files (i.e. test
# keys in CI), they are imported into SoftHSM (a HSM emulation library).
#
# Recipes access the available keys via a specific role. So, depending on
# whether we're building during development or for release, a given role can
# refer to different keys.
# Each key recipe PROVIDES a virtual package corresponding to the role, allowing
# the user to select one of multiple keys for a role when needed.
#
# For use with a real HSM, a PKCS #11 URI can be set (i.e. in local.conf) to
# override the SoftHSM key with the real one:
#
# SIGNING_PKCS11_URI[fit] = "pkcs11:serial=DENK0200554;object=ptx-dev-rauc&pin-value=123456"
# SIGNING_PKCS11_MODULE[fit] = "/usr/lib/x86_64-linux-gnu/opensc-pkcs11.so"
#
# Examples for defining roles and importing keys:
#
# meta-code-signing/recipes-security/signing-keys/dummy-rsa-key-native.bb
# meta-code-signing-demo/recipes-security/ptx-dev-keys/ptx-dev-keys-native_git.bb
#
# Examples for using keys for signing:
#
# meta-code-signing-demo/recipes-security/fit-image/linux-fit-image.bb
# meta-code-signing-demo/recipes-core/bundles/update-bundle.bb
#
# Examples for using keys for authentication:
#
# meta-code-signing-demo/recipes-security/fit-image/barebox_%.bbappend
# meta-code-signing-demo/recipes-core/rauc/rauc_%.bbappend
#
# Examples for using keys for both signing and authentication:
#
# meta-code-signing-demo/recipes-kernel/linux/linux-yocto_6.1.bbappend
SIGNING_PKCS11_URI ?= ""
SIGNING_PKCS11_MODULE ?= ""
DEPENDS += "softhsm-native libp11-native opensc-native openssl-native"
def signing_class_prepare(d):
import os.path
def export(role, k, v):
k = k % (role, )
d.setVar(k, v)
d.setVarFlag(k, "export", "1")
roles = set()
roles |= (d.getVarFlags("SIGNING_PKCS11_URI") or {}).keys()
roles |= (d.getVarFlags("SIGNING_PKCS11_MODULE") or {}).keys()
for role in roles:
if not set(role).issubset("abcdefghijklmnopqrstuvwxyz0123456789_"):
bb.fatal("key role name '%s' must consist of only [a-z0-9_]" % (role,))
pkcs11_uri = d.getVarFlag("SIGNING_PKCS11_URI", role) or d.getVar("SIGNING_PKCS11_URI")
if not pkcs11_uri.startswith("pkcs11:"):
bb.fatal("URI for key role '%s' must start with 'pkcs11:'" % (role,))
pkcs11_module = d.getVarFlag("SIGNING_PKCS11_MODULE", role) or d.getVar("SIGNING_PKCS11_MODULE")
if not os.path.isfile(pkcs11_module):
bb.fatal("module path for key role '%s' must be an existing file" % (role,))
if pkcs11_uri and not pkcs11_module:
bb.warn("SIGNING_PKCS11_URI[%s] is set without SIGNING_PKCS11_MODULE[%s]" % (role, role))
if pkcs11_module and not pkcs11_uri:
bb.warn("SIGNING_PKCS11_MODULE[%s] is set without SIGNING_PKCS11_URI[%s]" % (role, role))
export(role, "SIGNING_PKCS11_URI_%s_", pkcs11_uri)
export(role, "SIGNING_PKCS11_MODULE_%s_", pkcs11_module)
signing_pkcs11_tool() {
pkcs11-tool --module "${STAGING_LIBDIR_NATIVE}/softhsm/libsofthsm2.so" --login --pin 1111 $*
}
signing_import_prepare() {
export _SIGNING_ENV_FILE_="${B}/meta-signing.env"
rm -f "$_SIGNING_ENV_FILE_"
export SOFTHSM2_CONF="${B}/softhsm2.conf"
export SOFTHSM2_DIR="${B}/softhsm2.tokens"
export SOFTHSM2_MOD="${STAGING_LIBDIR_NATIVE}/softhsm/libsofthsm2.so"
echo "directories.tokendir = $SOFTHSM2_DIR" > "$SOFTHSM2_CONF"
echo "objectstore.backend = db" >> "$SOFTHSM2_CONF"
rm -rf "$SOFTHSM2_DIR"
mkdir -p "$SOFTHSM2_DIR"
softhsm2-util --module $SOFTHSM2_MOD --init-token --free --label ${PN} --pin 1111 --so-pin 222222
}
signing_import_define_role() {
local role="${1}"
case "${1}" in
(*[!a-z0-9_]*) false;;
(*) true;;
esac || bbfatal "invalid role name '${1}', must consist of [a-z0-9_]"
echo "_SIGNING_PKCS11_URI_${role}_=\"pkcs11:token=${PN};object=$role;pin-value=1111\"" >> $_SIGNING_ENV_FILE_
echo "_SIGNING_PKCS11_MODULE_${role}_=\"softhsm\"" >> $_SIGNING_ENV_FILE_
}
# signing_import_cert_from_der <role> <der>
#
# Import a certificate from DER file to a role. To be used
# with SoftHSM.
signing_import_cert_from_der() {
local role="${1}"
local der="${2}"
signing_pkcs11_tool --type cert --write-object "${der}" --label "${role}"
}
# signing_import_cert_from_pem <role> <pem>
#
# Import a certificate from PEM file to a role. To be used
# with SoftHSM.
signing_import_cert_from_pem() {
local role="${1}"
local pem="${2}"
openssl x509 \
-in "${pem}" -inform pem -outform der |
signing_pkcs11_tool --type cert --write-object /proc/self/fd/0 --label "${role}"
}
# signing_import_pubkey_from_der <role> <der>
#
# Import a public key from DER file to a role. To be used with SoftHSM.
signing_import_pubkey_from_der() {
local role="${1}"
local der="${2}"
signing_pkcs11_tool --type pubkey --write-object "${der}" --label "${role}"
}
# signing_import_pubkey_from_pem <role> <pem>
#
# Import a public key from PEM file to a role. To be used with SoftHSM.
signing_import_pubkey_from_pem() {
local openssl_keyopt
local role="${1}"
local pem="${2}"
if [ -n "${IMPORT_PASS_FILE}" ]; then
openssl pkey \
-passin "file:${IMPORT_PASS_FILE}" \
-in "${pem}" -inform pem -pubout -outform der
else
openssl pkey \
-in "${pem}" -inform pem -pubout -outform der
fi |
signing_pkcs11_tool --type pubkey --write-object /proc/self/fd/0 --label "${role}"
}
# signing_import_privkey_from_der <role> <der>
#
# Import a private key from DER file to a role. To be used with SoftHSM.
signing_import_privkey_from_der() {
local role="${1}"
local der="${2}"
signing_pkcs11_tool --type privkey --write-object "${der}" --label "${role}"
}
# signing_import_privkey_from_pem <role> <pem>
#
# Import a private key from PEM file to a role. To be used with SoftHSM.
signing_import_privkey_from_pem() {
local openssl_keyopt
local role="${1}"
local pem="${2}"
if [ -n "${IMPORT_PASS_FILE}" ]; then
openssl pkey \
-passin "file:${IMPORT_PASS_FILE}" \
-in "${pem}" -inform pem -outform der
else
openssl pkey \
-in "${pem}" -inform pem -outform der
fi |
signing_pkcs11_tool --type privkey --write-object /proc/self/fd/0 --label "${role}"
}
# signing_import_key_from_pem <role> <pem>
#
# Import a private and public key from PEM file to a role. To be used
# with SoftHSM.
signing_import_key_from_pem() {
local role="${1}"
local pem="${2}"
signing_import_pubkey_from_pem "${role}" "${pem}"
signing_import_privkey_from_pem "${role}" "${pem}"
}
signing_import_finish() {
echo "loaded objects:"
signing_pkcs11_tool --list-objects
}
signing_import_install() {
install -d ${D}${localstatedir}/lib/softhsm/tokens/${PN}
install -m 600 -t ${D}${localstatedir}/lib/softhsm/tokens/${PN} ${B}/softhsm2.tokens/*/*
install -d ${D}${localstatedir}/lib/meta-signing.env.d
install -m 644 "${B}/meta-signing.env" ${D}${localstatedir}/lib/meta-signing.env.d/${PN}
}
signing_prepare() {
export OPENSSL_MODULES="${STAGING_LIBDIR_NATIVE}/ossl-modules"
export OPENSSL_ENGINES="${STAGING_LIBDIR_NATIVE}/engines-3"
export OPENSSL_CONF="${STAGING_LIBDIR_NATIVE}/ssl-3/openssl.cnf"
export SSL_CERT_DIR="${STAGING_LIBDIR_NATIVE}/ssl-3/certs"
export SSL_CERT_FILE="${STAGING_LIBDIR_NATIVE}/ssl-3/cert.pem"
if [ -f ${OPENSSL_CONF} ]; then
echo "Using '${OPENSSL_CONF}' for OpenSSL configuration"
else
echo "Missing 'openssl.cnf' at '${STAGING_ETCDIR_NATIVE}/ssl'"
return 1
fi
if [ -d ${OPENSSL_MODULES} ]; then
echo "Using '${OPENSSL_MODULES}' for OpenSSL run-time modules"
else
echo "Missing OpenSSL module directory at '${OPENSSL_MODULES}'"
return 1
fi
if [ -d ${OPENSSL_ENGINES} ]; then
echo "Using '${OPENSSL_ENGINES}' for OpenSSL run-time PKCS#11 modules"
else
echo "Missing OpenSSL PKCS11 engine directory at '${OPENSSL_ENGINES}'"
return 1
fi
export SOFTHSM2_CONF="${WORKDIR}/softhsm2.conf"
export SOFTHSM2_DIR="${STAGING_DIR_NATIVE}/var/lib/softhsm/tokens"
echo "directories.tokendir = $SOFTHSM2_DIR" > "$SOFTHSM2_CONF"
echo "objectstore.backend = db" >> "$SOFTHSM2_CONF"
for env in $(ls "${STAGING_DIR_NATIVE}/var/lib/meta-signing.env.d"); do
. "${STAGING_DIR_NATIVE}/var/lib/meta-signing.env.d/$env"
done
}
# make sure these functions are exported
signing_prepare[vardeps] += "signing_get_uri signing_get_module"
signing_use_role() {
local role="${1}"
export PKCS11_MODULE_PATH="$(signing_get_module $role)"
export PKCS11_URI="$(signing_get_uri $role)"
if [ -z "$PKCS11_MODULE_PATH" ]; then
echo "No PKCS11_MODULE_PATH found for role '${role}'"
exit 1
fi
if [ -z "$PKCS11_URI" ]; then
echo "No PKCS11_URI found for role '${role}'"
exit 1
fi
}
signing_get_uri() {
local role="${1}"
# prefer local configuration
eval local uri="\$SIGNING_PKCS11_URI_${role}_"
if [ -n "$uri" ]; then
echo "$uri"
return
fi
# fall back to softhsm
eval echo "\$_SIGNING_PKCS11_URI_${role}_"
}
signing_get_module() {
local role="${1}"
# prefer local configuration
eval local module="\$SIGNING_PKCS11_MODULE_${role}_"
if [ -n "$module" ]; then
echo "$module"
return
fi
# fall back to softhsm
eval local module="\$_SIGNING_PKCS11_MODULE_${role}_"
if [ "$module" = "softhsm" ]; then
echo "${STAGING_LIBDIR_NATIVE}/softhsm/libsofthsm2.so"
else
echo "$module"
fi
}
python () {
signing_class_prepare(d)
}