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#
# Copyright OpenEmbedded Contributors
#
# SPDX-License-Identifier: MIT
#
# This file is part of U-Boot verified boot support and is intended to be
# inherited from the u-boot recipe.
#
# The signature procedure requires the user to generate an RSA key and
# certificate in a directory and to define the following variable:
#
# UBOOT_SIGN_KEYDIR = "/keys/directory"
# UBOOT_SIGN_KEYNAME = "dev" # keys name in keydir (eg. "dev.crt", "dev.key")
# UBOOT_MKIMAGE_DTCOPTS = "-I dts -O dtb -p 2000"
# UBOOT_SIGN_ENABLE = "1"
#
# As verified boot depends on fitImage generation, following is also required:
#
# KERNEL_CLASSES ?= " kernel-fitimage "
# KERNEL_IMAGETYPE ?= "fitImage"
#
# The signature support is limited to the use of CONFIG_OF_SEPARATE in U-Boot.
#
# For more details on signature process, please refer to U-Boot documentation.
# We need some variables from u-boot-config
inherit uboot-config
# Enable use of a U-Boot fitImage
UBOOT_FITIMAGE_ENABLE ?= "0"
# Signature activation - this requires UBOOT_FITIMAGE_ENABLE = "1"
SPL_SIGN_ENABLE ?= "0"
# Default value for deployment filenames.
UBOOT_DTB_IMAGE ?= "u-boot-${MACHINE}-${PV}-${PR}.dtb"
UBOOT_DTB_BINARY ?= "u-boot.dtb"
UBOOT_DTB_SIGNED ?= "${UBOOT_DTB_BINARY}-signed"
UBOOT_DTB_SYMLINK ?= "u-boot-${MACHINE}.dtb"
UBOOT_NODTB_IMAGE ?= "u-boot-nodtb-${MACHINE}-${PV}-${PR}.bin"
UBOOT_NODTB_BINARY ?= "u-boot-nodtb.bin"
UBOOT_NODTB_SYMLINK ?= "u-boot-nodtb-${MACHINE}.bin"
UBOOT_ITS_IMAGE ?= "u-boot-its-${MACHINE}-${PV}-${PR}"
UBOOT_ITS ?= "u-boot.its"
UBOOT_ITS_SYMLINK ?= "u-boot-its-${MACHINE}"
UBOOT_FITIMAGE_IMAGE ?= "u-boot-fitImage-${MACHINE}-${PV}-${PR}"
UBOOT_FITIMAGE_BINARY ?= "u-boot-fitImage"
UBOOT_FITIMAGE_SYMLINK ?= "u-boot-fitImage-${MACHINE}"
SPL_DIR ?= "spl"
SPL_DTB_IMAGE ?= "u-boot-spl-${MACHINE}-${PV}-${PR}.dtb"
SPL_DTB_BINARY ?= "u-boot-spl.dtb"
SPL_DTB_SIGNED ?= "${SPL_DTB_BINARY}-signed"
SPL_DTB_SYMLINK ?= "u-boot-spl-${MACHINE}.dtb"
SPL_NODTB_IMAGE ?= "u-boot-spl-nodtb-${MACHINE}-${PV}-${PR}.bin"
SPL_NODTB_BINARY ?= "u-boot-spl-nodtb.bin"
SPL_NODTB_SYMLINK ?= "u-boot-spl-nodtb-${MACHINE}.bin"
# U-Boot fitImage description
UBOOT_FIT_DESC ?= "U-Boot fitImage for ${DISTRO_NAME}/${PV}/${MACHINE}"
# U-Boot fitImage Hash Algo
UBOOT_FIT_HASH_ALG ?= "sha256"
# U-Boot fitImage Signature Algo
UBOOT_FIT_SIGN_ALG ?= "rsa2048"
# Generate keys for signing U-Boot fitImage
UBOOT_FIT_GENERATE_KEYS ?= "0"
# Size of private keys in number of bits
UBOOT_FIT_SIGN_NUMBITS ?= "2048"
# args to openssl genrsa (Default is just the public exponent)
UBOOT_FIT_KEY_GENRSA_ARGS ?= "-F4"
# args to openssl req (Default is -batch for non interactive mode and
# -new for new certificate)
UBOOT_FIT_KEY_REQ_ARGS ?= "-batch -new"
# Standard format for public key certificate
UBOOT_FIT_KEY_SIGN_PKCS ?= "-x509"
# This is only necessary for determining the signing configuration
KERNEL_PN = "${PREFERRED_PROVIDER_virtual/kernel}"
python() {
# We need u-boot-tools-native if we're creating a U-Boot fitImage
sign = d.getVar('UBOOT_SIGN_ENABLE') == '1'
if d.getVar('UBOOT_FITIMAGE_ENABLE') == '1' or sign:
d.appendVar('DEPENDS', " u-boot-tools-native dtc-native")
if sign:
d.appendVar('DEPENDS', " " + d.getVar('KERNEL_PN'))
}
concat_dtb() {
type="$1"
binary="$2"
if [ -e "${UBOOT_DTB_BINARY}" ]; then
# Re-sign the kernel in order to add the keys to our dtb
${UBOOT_MKIMAGE_SIGN} \
${@'-D "${UBOOT_MKIMAGE_DTCOPTS}"' if len('${UBOOT_MKIMAGE_DTCOPTS}') else ''} \
-F -k "${UBOOT_SIGN_KEYDIR}" \
-K "${UBOOT_DTB_BINARY}" \
-r ${B}/fitImage-linux \
${UBOOT_MKIMAGE_SIGN_ARGS}
cp ${UBOOT_DTB_BINARY} ${UBOOT_DTB_SIGNED}
fi
# If we're not using a signed u-boot fit, concatenate SPL w/o DTB & U-Boot DTB
# with public key (otherwise U-Boot will be packaged by uboot_fitimage_assemble)
if [ "${SPL_SIGN_ENABLE}" != "1" ] ; then
if [ "x${UBOOT_SUFFIX}" = "ximg" -o "x${UBOOT_SUFFIX}" = "xrom" ] && \
[ -e "${UBOOT_DTB_BINARY}" ]; then
oe_runmake EXT_DTB="${UBOOT_DTB_SIGNED}" ${UBOOT_MAKE_TARGET}
if [ -n "${binary}" ]; then
cp ${binary} ${UBOOT_BINARYNAME}-${type}.${UBOOT_SUFFIX}
fi
elif [ -e "${UBOOT_NODTB_BINARY}" -a -e "${UBOOT_DTB_BINARY}" ]; then
if [ -n "${binary}" ]; then
cat ${UBOOT_NODTB_BINARY} ${UBOOT_DTB_SIGNED} | tee ${binary} > \
${UBOOT_BINARYNAME}-${type}.${UBOOT_SUFFIX}
else
cat ${UBOOT_NODTB_BINARY} ${UBOOT_DTB_SIGNED} > ${UBOOT_BINARY}
fi
else
bbwarn "Failure while adding public key to u-boot binary. Verified boot won't be available."
fi
fi
}
deploy_dtb() {
type="$1"
if [ -n "${type}" ]; then
uboot_dtb_binary="u-boot-${type}-${PV}-${PR}.dtb"
uboot_nodtb_binary="u-boot-nodtb-${type}-${PV}-${PR}.bin"
else
uboot_dtb_binary="${UBOOT_DTB_IMAGE}"
uboot_nodtb_binary="${UBOOT_NODTB_IMAGE}"
fi
if [ -e "${UBOOT_DTB_SIGNED}" ]; then
install -Dm644 ${UBOOT_DTB_SIGNED} ${DEPLOYDIR}/${uboot_dtb_binary}
if [ -n "${type}" ]; then
ln -sf ${uboot_dtb_binary} ${DEPLOYDIR}/${UBOOT_DTB_IMAGE}
fi
fi
if [ -f "${UBOOT_NODTB_BINARY}" ]; then
install -Dm644 ${UBOOT_DTB_BINARY} ${DEPLOYDIR}/${uboot_nodtb_binary}
if [ -n "${type}" ]; then
ln -sf ${uboot_nodtb_binary} ${DEPLOYDIR}/${UBOOT_NODTB_IMAGE}
fi
fi
}
concat_spl_dtb() {
if [ -e "${SPL_DIR}/${SPL_NODTB_BINARY}" -a -e "${SPL_DIR}/${SPL_DTB_BINARY}" ] ; then
cat ${SPL_DIR}/${SPL_NODTB_BINARY} ${SPL_DIR}/${SPL_DTB_SIGNED} > "${SPL_BINARY}"
else
bbwarn "Failure while adding public key to spl binary. Verified U-Boot boot won't be available."
fi
}
deploy_spl_dtb() {
type="$1"
if [ -n "${type}" ]; then
spl_dtb_binary="u-boot-spl-${type}-${PV}-${PR}.dtb"
spl_nodtb_binary="u-boot-spl-nodtb-${type}-${PV}-${PR}.bin"
else
spl_dtb_binary="${SPL_DTB_IMAGE}"
spl_nodtb_binary="${SPL_NODTB_IMAGE}"
fi
if [ -e "${SPL_DIR}/${SPL_DTB_SIGNED}" ] ; then
install -Dm644 ${SPL_DIR}/${SPL_DTB_SIGNED} ${DEPLOYDIR}/${spl_dtb_binary}
if [ -n "${type}" ]; then
ln -sf ${spl_dtb_binary} ${DEPLOYDIR}/${SPL_DTB_IMAGE}
fi
fi
if [ -f "${SPL_DIR}/${SPL_NODTB_BINARY}" ] ; then
install -Dm644 ${SPL_DIR}/${SPL_NODTB_BINARY} ${DEPLOYDIR}/${spl_nodtb_binary}
if [ -n "${type}" ]; then
ln -sf ${spl_nodtb_binary} ${DEPLOYDIR}/${SPL_NODTB_IMAGE}
fi
fi
# For backwards compatibility...
install -Dm644 ${SPL_BINARY} ${DEPLOYDIR}/${SPL_IMAGE}
}
do_uboot_generate_rsa_keys() {
if [ "${SPL_SIGN_ENABLE}" = "0" ] && [ "${UBOOT_FIT_GENERATE_KEYS}" = "1" ]; then
bbwarn "UBOOT_FIT_GENERATE_KEYS is set to 1 eventhough SPL_SIGN_ENABLE is set to 0. The keys will not be generated as they won't be used."
fi
if [ "${SPL_SIGN_ENABLE}" = "1" ] && [ "${UBOOT_FIT_GENERATE_KEYS}" = "1" ]; then
# Generate keys only if they don't already exist
if [ ! -f "${SPL_SIGN_KEYDIR}/${SPL_SIGN_KEYNAME}".key ] || \
[ ! -f "${SPL_SIGN_KEYDIR}/${SPL_SIGN_KEYNAME}".crt ]; then
# make directory if it does not already exist
mkdir -p "${SPL_SIGN_KEYDIR}"
echo "Generating RSA private key for signing U-Boot fitImage"
openssl genrsa ${UBOOT_FIT_KEY_GENRSA_ARGS} -out \
"${SPL_SIGN_KEYDIR}/${SPL_SIGN_KEYNAME}".key \
"${UBOOT_FIT_SIGN_NUMBITS}"
echo "Generating certificate for signing U-Boot fitImage"
openssl req ${UBOOT_FIT_KEY_REQ_ARGS} "${UBOOT_FIT_KEY_SIGN_PKCS}" \
-key "${SPL_SIGN_KEYDIR}/${SPL_SIGN_KEYNAME}".key \
-out "${SPL_SIGN_KEYDIR}/${SPL_SIGN_KEYNAME}".crt
fi
fi
}
addtask uboot_generate_rsa_keys before do_uboot_assemble_fitimage after do_compile
# Create a ITS file for the U-boot FIT, for use when
# we want to sign it so that the SPL can verify it
uboot_fitimage_assemble() {
rm -f ${UBOOT_ITS} ${UBOOT_FITIMAGE_BINARY}
# First we create the ITS script
cat << EOF >> ${UBOOT_ITS}
/dts-v1/;
/ {
description = "${UBOOT_FIT_DESC}";
#address-cells = <1>;
images {
uboot {
description = "U-Boot image";
data = /incbin/("${UBOOT_NODTB_BINARY}");
type = "standalone";
os = "u-boot";
arch = "${UBOOT_ARCH}";
compression = "none";
load = <${UBOOT_LOADADDRESS}>;
entry = <${UBOOT_ENTRYPOINT}>;
EOF
if [ "${SPL_SIGN_ENABLE}" = "1" ] ; then
cat << EOF >> ${UBOOT_ITS}
signature {
algo = "${UBOOT_FIT_HASH_ALG},${UBOOT_FIT_SIGN_ALG}";
key-name-hint = "${SPL_SIGN_KEYNAME}";
};
EOF
fi
cat << EOF >> ${UBOOT_ITS}
};
fdt {
description = "U-Boot FDT";
data = /incbin/("${UBOOT_DTB_BINARY}");
type = "flat_dt";
arch = "${UBOOT_ARCH}";
compression = "none";
EOF
if [ "${SPL_SIGN_ENABLE}" = "1" ] ; then
cat << EOF >> ${UBOOT_ITS}
signature {
algo = "${UBOOT_FIT_HASH_ALG},${UBOOT_FIT_SIGN_ALG}";
key-name-hint = "${SPL_SIGN_KEYNAME}";
};
EOF
fi
cat << EOF >> ${UBOOT_ITS}
};
};
configurations {
default = "conf";
conf {
description = "Boot with signed U-Boot FIT";
loadables = "uboot";
fdt = "fdt";
};
};
};
EOF
#
# Assemble the U-boot FIT image
#
${UBOOT_MKIMAGE} \
${@'-D "${SPL_MKIMAGE_DTCOPTS}"' if len('${SPL_MKIMAGE_DTCOPTS}') else ''} \
-f ${UBOOT_ITS} \
${UBOOT_FITIMAGE_BINARY}
if [ "${SPL_SIGN_ENABLE}" = "1" ] ; then
#
# Sign the U-boot FIT image and add public key to SPL dtb
#
${UBOOT_MKIMAGE_SIGN} \
${@'-D "${SPL_MKIMAGE_DTCOPTS}"' if len('${SPL_MKIMAGE_DTCOPTS}') else ''} \
-F -k "${SPL_SIGN_KEYDIR}" \
-K "${SPL_DIR}/${SPL_DTB_BINARY}" \
-r ${UBOOT_FITIMAGE_BINARY} \
${SPL_MKIMAGE_SIGN_ARGS}
fi
cp ${SPL_DIR}/${SPL_DTB_BINARY} ${SPL_DIR}/${SPL_DTB_SIGNED}
}
uboot_assemble_fitimage_helper() {
type="$1"
binary="$2"
if [ "${UBOOT_SIGN_ENABLE}" = "1" -a -n "${UBOOT_DTB_BINARY}" ] ; then
concat_dtb $type $binary
fi
if [ "${UBOOT_FITIMAGE_ENABLE}" = "1" -a -n "${SPL_DTB_BINARY}" ]; then
uboot_fitimage_assemble
fi
if [ "${SPL_SIGN_ENABLE}" = "1" -a -n "${SPL_DTB_BINARY}" ] ; then
concat_spl_dtb
fi
}
do_uboot_assemble_fitimage() {
if [ "${UBOOT_SIGN_ENABLE}" = "1" ] ; then
cp "${STAGING_DIR_HOST}/sysroot-only/fitImage" "${B}/fitImage-linux"
fi
if [ -n "${UBOOT_CONFIG}" ]; then
unset i j k
for config in ${UBOOT_MACHINE}; do
i=$(expr $i + 1);
for type in ${UBOOT_CONFIG}; do
j=$(expr $j + 1);
if [ $j -eq $i ]; then
break;
fi
done
for binary in ${UBOOT_BINARIES}; do
k=$(expr $j + 1);
if [ $k -eq $i ]; then
break;
fi
done
cd ${B}/${config}
uboot_assemble_fitimage_helper ${type} ${binary}
done
else
cd ${B}
uboot_assemble_fitimage_helper "" ${UBOOT_BINARY}
fi
}
addtask uboot_assemble_fitimage before do_install do_deploy after do_compile
deploy_helper() {
type="$1"
if [ "${UBOOT_SIGN_ENABLE}" = "1" -a -n "${UBOOT_DTB_SIGNED}" ] ; then
deploy_dtb $type
fi
if [ "${UBOOT_FITIMAGE_ENABLE}" = "1" -a -n "${SPL_DTB_BINARY}" ]; then
if [ -n "${type}" ]; then
uboot_its_image="u-boot-its-${type}-${PV}-${PR}"
uboot_fitimage_image="u-boot-fitImage-${type}-${PV}-${PR}"
else
uboot_its_image="${UBOOT_ITS_IMAGE}"
uboot_fitimage_image="${UBOOT_FITIMAGE_IMAGE}"
fi
install -Dm644 ${UBOOT_FITIMAGE_BINARY} ${DEPLOYDIR}/$uboot_fitimage_image
install -Dm644 ${UBOOT_ITS} ${DEPLOYDIR}/$uboot_its_image
if [ -n "${type}" ]; then
ln -sf $uboot_its_image ${DEPLOYDIR}/${UBOOT_ITS_IMAGE}
ln -sf $uboot_fitimage_image ${DEPLOYDIR}/${UBOOT_FITIMAGE_IMAGE}
fi
fi
if [ "${SPL_SIGN_ENABLE}" = "1" -a -n "${SPL_DTB_SIGNED}" ] ; then
deploy_spl_dtb $type
fi
}
do_deploy:prepend() {
if [ -n "${UBOOT_CONFIG}" ]; then
unset i j k
for config in ${UBOOT_MACHINE}; do
i=$(expr $i + 1);
for type in ${UBOOT_CONFIG}; do
j=$(expr $j + 1);
if [ $j -eq $i ]; then
cd ${B}/${config}
deploy_helper ${type}
fi
done
done
else
cd ${B}
deploy_helper ""
fi
if [ "${UBOOT_SIGN_ENABLE}" = "1" -a -n "${UBOOT_DTB_BINARY}" ] ; then
ln -sf ${UBOOT_DTB_IMAGE} ${DEPLOYDIR}/${UBOOT_DTB_BINARY}
ln -sf ${UBOOT_DTB_IMAGE} ${DEPLOYDIR}/${UBOOT_DTB_SYMLINK}
ln -sf ${UBOOT_NODTB_IMAGE} ${DEPLOYDIR}/${UBOOT_NODTB_SYMLINK}
ln -sf ${UBOOT_NODTB_IMAGE} ${DEPLOYDIR}/${UBOOT_NODTB_BINARY}
fi
if [ "${UBOOT_FITIMAGE_ENABLE}" = "1" ] ; then
ln -sf ${UBOOT_ITS_IMAGE} ${DEPLOYDIR}/${UBOOT_ITS}
ln -sf ${UBOOT_ITS_IMAGE} ${DEPLOYDIR}/${UBOOT_ITS_SYMLINK}
ln -sf ${UBOOT_FITIMAGE_IMAGE} ${DEPLOYDIR}/${UBOOT_FITIMAGE_BINARY}
ln -sf ${UBOOT_FITIMAGE_IMAGE} ${DEPLOYDIR}/${UBOOT_FITIMAGE_SYMLINK}
fi
if [ "${SPL_SIGN_ENABLE}" = "1" -a -n "${SPL_DTB_BINARY}" ] ; then
ln -sf ${SPL_DTB_IMAGE} ${DEPLOYDIR}/${SPL_DTB_SYMLINK}
ln -sf ${SPL_DTB_IMAGE} ${DEPLOYDIR}/${SPL_DTB_BINARY}
ln -sf ${SPL_NODTB_IMAGE} ${DEPLOYDIR}/${SPL_NODTB_SYMLINK}
ln -sf ${SPL_NODTB_IMAGE} ${DEPLOYDIR}/${SPL_NODTB_BINARY}
fi
}
do_deploy:append() {
# If we're creating a u-boot fitImage, point u-boot.bin
# symlink since it might get used by image recipes
if [ "${UBOOT_FITIMAGE_ENABLE}" = "1" ] ; then
ln -sf ${UBOOT_FITIMAGE_IMAGE} ${DEPLOYDIR}/${UBOOT_BINARY}
ln -sf ${UBOOT_FITIMAGE_IMAGE} ${DEPLOYDIR}/${UBOOT_SYMLINK}
fi
}