Add the necessary infrastructure to create a U-boot proper fitimage, sign it (using the same keys as the kernel-fitimage), and put the public key in the SPL binary so that verified SPL boot can be accomplished.
Signed-off-by: Klaus Heinrich Kiwi <[email protected]> --- meta/classes/kernel-fitimage.bbclass | 11 +- meta/classes/uboot-sign.bbclass | 335 +++++++++++++++++++++++++-- 2 files changed, 321 insertions(+), 25 deletions(-) diff --git a/meta/classes/kernel-fitimage.bbclass b/meta/classes/kernel-fitimage.bbclass index 76e2e6c136..cbc8d93fec 100644 --- a/meta/classes/kernel-fitimage.bbclass +++ b/meta/classes/kernel-fitimage.bbclass @@ -694,6 +694,15 @@ kernel_do_deploy_append() { # ${UBOOT_DTB_IMAGE} since it contains ${PV} which is aimed # for u-boot, but we are in kernel env now. install -m 0644 ${B}/u-boot-${MACHINE}*.dtb "$deployDir/" + if [ "${SPL_SIGN_ENABLE}" = "1" -a -n "${UBOOT_BINARY}" -a -n "${SPL_DTB_BINARY}" ] ; then + # If we're also signing the uboot fit, now we need to + # deploy it, it's its file, as well as u-boot-spl.dtb + install -m 0644 ${B}/u-boot-spl-${MACHINE}*.dtb "$deployDir/" + echo "Copying u-boot-fitImage file..." + install -m 0644 ${B}/u-boot-fitImage-* "$deployDir/" + echo "Copying u-boot-its file..." + install -m 0644 ${B}/u-boot-its-* "$deployDir/" + fi fi fi } @@ -711,4 +720,4 @@ python () { bb.build.deltask('do_assemble_fitimage', d) bb.build.deltask('generate_rsa_keys', d) bb.build.addtask('generate_rsa_keys', 'do_assemble_fitimage_initramfs', 'do_bundle_initramfs', d) -} \ No newline at end of file +} diff --git a/meta/classes/uboot-sign.bbclass b/meta/classes/uboot-sign.bbclass index d57bef6669..86380f2234 100644 --- a/meta/classes/uboot-sign.bbclass +++ b/meta/classes/uboot-sign.bbclass @@ -36,23 +36,27 @@ inherit uboot-config # Signature activation. UBOOT_SIGN_ENABLE ?= "0" +SPL_SIGN_ENABLE ?= "0" # Default value for deployment filenames. UBOOT_DTB_IMAGE ?= "u-boot-${MACHINE}-${PV}-${PR}.dtb" UBOOT_DTB_BINARY ?= "u-boot.dtb" UBOOT_DTB_SYMLINK ?= "u-boot-${MACHINE}.dtb" -UBOOT_NODTB_IMAGE ?= "u-boot-nodtb-${MACHINE}-${PV}-${PR}.${UBOOT_SUFFIX}" -UBOOT_NODTB_BINARY ?= "u-boot-nodtb.${UBOOT_SUFFIX}" -UBOOT_NODTB_SYMLINK ?= "u-boot-nodtb-${MACHINE}.${UBOOT_SUFFIX}" -UBOOT_ITS_IMAGE ?= "u-boot-${MACHINE}-${PV}-${PR}.its" +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}-${PR}" UBOOT_ITS ?= "u-boot.its" -UBOOT_ITS_SYMLINK ?= "u-boot-${MACHINE}.its" -SPL_DIR ?= "${@os.path.dirname(d.getVar("SPL_BINARY")) or '.'}" +UBOOT_ITS_SYMLINK ?= "u-boot-its-${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}-${PR}.dtb" SPL_DTB_BINARY ?= "u-boot-spl.dtb" SPL_DTB_SYMLINK ?= "u-boot-spl-${MACHINE}.dtb" SPL_NODTB_IMAGE ?= "${@os.path.splitext(d.getVar("SPL_BINARYNAME"))[0]}-nodtb-${MACHINE}-${PV}-${PR}${@os.path.splitext(d.getVar("SPL_BINARYNAME"))[1]}" -SPL_NODTB_BINARY ?= "${@os.path.splitext(d.getVar("SPL_BINARYNAME"))[0]}-nodtb${@os.path.splitext(d.getVar("SPL_BINARYNAME"))[1]}" +SPL_NODTB_BINARY ?= "u-boot-spl-nodtb.bin" SPL_NODTB_SYMLINK ?= "${@os.path.splitext(d.getVar("SPL_BINARYNAME"))[0]}-nodtb-${MACHINE}${@os.path.splitext(d.getVar("SPL_BINARYNAME"))[1]}" # fitImage Hash Algo @@ -77,8 +81,18 @@ FIT_KEY_REQ_ARGS ?= "-batch -new" # Standard format for public key certificate FIT_KEY_SIGN_PKCS ?= "-x509" -# Functions in this bbclass is for u-boot only +# Functions on this bbclass can apply to either U-boot or Kernel, +# depending on the scenario UBOOT_PN = "${@d.getVar('PREFERRED_PROVIDER_u-boot') or 'u-boot'}" +KERNEL_PN = "${@d.getVar('PREFERRED_PROVIDER_virtual/kernel')}" + +# We need u-boot-tools-native if we're about to sign the SPL +python() { + if d.getVar('SPL_SIGN_ENABLE') == '1': + depends = d.getVar("DEPENDS") + depends = "%s u-boot-tools-native dtc-native" % depends + d.setVar("DEPENDS", depends) +} concat_dtb_helper() { if [ -e "${UBOOT_DTB_BINARY}" ]; then @@ -92,21 +106,59 @@ concat_dtb_helper() { ln -sf ${UBOOT_NODTB_IMAGE} ${DEPLOYDIR}/${UBOOT_NODTB_BINARY} fi - # Concatenate U-Boot w/o DTB & DTB with public key - # (cf. kernel-fitimage.bbclass for more details) - deployed_uboot_dtb_binary='${DEPLOY_DIR_IMAGE}/${UBOOT_DTB_IMAGE}' - if [ "x${UBOOT_SUFFIX}" = "ximg" -o "x${UBOOT_SUFFIX}" = "xrom" ] && \ - [ -e "$deployed_uboot_dtb_binary" ]; then - oe_runmake EXT_DTB=$deployed_uboot_dtb_binary - install ${UBOOT_BINARY} ${DEPLOYDIR}/${UBOOT_IMAGE} - elif [ -e "${DEPLOYDIR}/${UBOOT_NODTB_IMAGE}" -a -e "$deployed_uboot_dtb_binary" ]; then + # If we're not using a signed u-boot fit, concatenate SPL w/o DTB & U-Boot DTB + # with public key (otherwise it will be deployed by the equivalent + # concat_spl_dtb_helper function - cf. kernel-fitimage.bbclass for more details) + if [ "${SPL_SIGN_ENABLE}" != "1" ] ; then + deployed_uboot_dtb_binary='${DEPLOY_DIR_IMAGE}/${UBOOT_DTB_IMAGE}' + if [ "x${UBOOT_SUFFIX}" = "ximg" -o "x${UBOOT_SUFFIX}" = "xrom" ] && \ + [ -e "$deployed_uboot_dtb_binary" ]; then + oe_runmake EXT_DTB=$deployed_uboot_dtb_binary + install ${UBOOT_BINARY} ${DEPLOYDIR}/${UBOOT_IMAGE} + elif [ -e "${DEPLOYDIR}/${UBOOT_NODTB_IMAGE}" -a -e "$deployed_uboot_dtb_binary" ]; then + cd ${DEPLOYDIR} + cat ${UBOOT_NODTB_IMAGE} $deployed_uboot_dtb_binary | tee ${B}/${CONFIG_B_PATH}/${UBOOT_BINARY} > ${UBOOT_IMAGE} + else + bbwarn "Failure while adding public key to u-boot binary. Verified boot won't be available." + fi + fi +} + +concat_spl_dtb_helper() { + # Deploy the U-boot its file, spl dtb and the spl nodtb binary + + if [ -e "${SPL_DIR}/${SPL_DTB_BINARY}" ] ; then + # We only deploy u-boot-spl.dtb real file if we are NOT + # signing the kernel, otherwise the kernel PN will do + # it for us (see kernel-fitimage.bbclass) + if [ "${UBOOT_SIGN_ENABLE}" != "1" ] ; then + install -m 0644 ${SPL_DIR}/${SPL_DTB_BINARY} \ + ${DEPLOYDIR}/${SPL_DTB_IMAGE} + deployed_spl_dtb_binary='${DEPLOYDIR}/${SPL_DTB_IMAGE}' + else + deployed_spl_dtb_binary='${DEPLOY_DIR_IMAGE}/${SPL_DTB_IMAGE}' + fi; + ln -sf ${SPL_DTB_IMAGE} ${DEPLOYDIR}/${SPL_DTB_SYMLINK} + ln -sf ${SPL_DTB_IMAGE} ${DEPLOYDIR}/${SPL_DTB_BINARY} + fi + + if [ -f "${SPL_DIR}/${SPL_NODTB_BINARY}" ] ; then + echo "Copying u-boot-nodtb binary..." + install -m 0644 ${SPL_DIR}/${SPL_NODTB_BINARY} ${DEPLOYDIR}/${SPL_NODTB_IMAGE} + ln -sf ${SPL_NODTB_IMAGE} ${DEPLOYDIR}/${SPL_NODTB_SYMLINK} + ln -sf ${SPL_NODTB_IMAGE} ${DEPLOYDIR}/${SPL_NODTB_BINARY} + fi + + # Concatenate the SPL nodtb binary and u-boot.dtb (with pubkey) + if [ -e "${DEPLOYDIR}/${SPL_NODTB_IMAGE}" -a -e "$deployed_spl_dtb_binary" ] ; then cd ${DEPLOYDIR} - cat ${UBOOT_NODTB_IMAGE} $deployed_uboot_dtb_binary | tee ${B}/${CONFIG_B_PATH}/${UBOOT_BINARY} > ${UBOOT_IMAGE} + cat ${SPL_NODTB_IMAGE} $deployed_spl_dtb_binary | tee ${B}/${CONFIG_B_PATH}/${SPL_BINARY} > ${SPL_IMAGE} else - bbwarn "Failure while adding public key to u-boot binary. Verified boot won't be available." + bbwarn "Failure while adding public key to spl binary. Verified U-Boot boot won't be available." fi } + concat_dtb() { if [ "${UBOOT_SIGN_ENABLE}" = "1" -a "${PN}" = "${UBOOT_PN}" -a -n "${UBOOT_DTB_BINARY}" ]; then mkdir -p ${DEPLOYDIR} @@ -124,6 +176,24 @@ concat_dtb() { fi } +concat_spl_dtb() { + if [ "${SPL_SIGN_ENABLE}" = "1" -a "${PN}" = "${UBOOT_PN}" -a -n "${SPL_DTB_BINARY}" ]; then + mkdir -p ${DEPLOYDIR} + if [ -n "${UBOOT_CONFIG}" ]; then + for config in ${UBOOT_MACHINE}; do + CONFIG_B_PATH="${config}" + cd ${B}/${config} + concat_spl_dtb_helper + done + else + CONFIG_B_PATH="" + cd ${B} + concat_spl_dtb_helper + fi + fi +} + + # Install UBOOT_DTB_BINARY to datadir, so that kernel can use it for # signing, and kernel will deploy UBOOT_DTB_BINARY after signs it. install_helper() { @@ -138,30 +208,247 @@ install_helper() { fi } +# Install SPL dtb and u-boot nodtb to datadir, +install_spl_helper() { + if [ -f "${SPL_DIR}/${SPL_DTB_BINARY}" ]; then + install -d ${D}${datadir} + install ${SPL_DIR}/${SPL_DTB_BINARY} ${D}${datadir}/${SPL_DTB_IMAGE} + ln -sf ${SPL_DTB_IMAGE} ${D}${datadir}/${SPL_DTB_BINARY} + else + bbwarn "${SPL_DTB_BINARY} not found" + fi + if [ -f "${UBOOT_NODTB_BINARY}" ] ; then + install ${UBOOT_NODTB_BINARY} ${D}${datadir}/${UBOOT_NODTB_IMAGE} + ln -sf ${UBOOT_NODTB_IMAGE} ${D}${datadir}/${UBOOT_NODTB_BINARY} + else + bbwarn "${UBOOT_NODTB_BINARY} not found" + fi + + # We need to install a 'stub' u-boot-fitimage + its to datadir, + # so that the KERNEL_PN can use the correct filename when + # assembling and deploying them + touch ${D}/${datadir}/${UBOOT_FITIMAGE_IMAGE} + touch ${D}/${datadir}/${UBOOT_ITS_IMAGE} +} + do_install_append() { - if [ "${UBOOT_SIGN_ENABLE}" = "1" -a "${PN}" = "${UBOOT_PN}" -a -n "${UBOOT_DTB_BINARY}" ]; then + if [ "${PN}" = "${UBOOT_PN}" ]; then if [ -n "${UBOOT_CONFIG}" ]; then for config in ${UBOOT_MACHINE}; do cd ${B}/${config} - install_helper + if [ "${UBOOT_SIGN_ENABLE}" = "1" -a -n "${UBOOT_DTB_BINARY}" ]; then + install_helper + fi + if [ "${SPL_SIGN_ENABLE}" = "1" -a -n "${SPL_DTB_BINARY}" ]; then + install_spl_helper + fi done else cd ${B} - install_helper + if [ "${UBOOT_SIGN_ENABLE}" = "1" -a -n "${UBOOT_DTB_BINARY}" ]; then + install_helper + fi + if [ "${SPL_SIGN_ENABLE}" = "1" -a -n "${SPL_DTB_BINARY}" ]; then + install_spl_helper + fi + fi + fi +} + +do_generate_rsa_keys() { + if [ "${UBOOT_SIGN_ENABLE}" = "0" ] && [ "${FIT_GENERATE_KEYS}" = "1" ]; then + bbwarn "FIT_GENERATE_KEYS is set to 1 even though UBOOT_SIGN_ENABLE is set to 0. The keys will not be generated as they won't be used." + fi + + if [ "${UBOOT_SIGN_ENABLE}" = "1" ] && [ "${FIT_GENERATE_KEYS}" = "1" ]; then + + # Generate keys only if they don't already exist + if [ ! -f "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".key ] || \ + [ ! -f "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".crt ]; then + + # make directory if it does not already exist + mkdir -p "${UBOOT_SIGN_KEYDIR}" + + echo "Generating RSA private key for signing fitImage" + openssl genrsa ${FIT_KEY_GENRSA_ARGS} -out \ + "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".key \ + "${FIT_SIGN_NUMBITS}" + + echo "Generating certificate for signing fitImage" + openssl req ${FIT_KEY_REQ_ARGS} "${FIT_KEY_SIGN_PKCS}" \ + -key "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".key \ + -out "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".crt + fi + fi +} + +addtask 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() { + uboot_its="${1}" + uboot_nodtb_bin="${2}" + uboot_dtb="${3}" + uboot_bin="${4}" + spl_dtb="${5}" + uboot_csum="${FIT_HASH_ALG}" + uboot_sign_algo="${FIT_SIGN_ALG}" + uboot_sign_keyname="${UBOOT_SIGN_KEYNAME}" + + rm -f ${uboot_its} ${uboot_bin} + + # First we create the ITS script + cat << EOF >> ${uboot_its} +/dts-v1/; + +/ { + description = "U-boot FIT"; + #address-cells = <1>; + + images { + uboot { + description = "U-Boot image"; + data = /incbin/("${uboot_nodtb_bin}"); + type = "standalone"; + os = "U-Boot"; + arch = "${UBOOT_ARCH}"; + compression = "none"; + load = <${UBOOT_LOADADDRESS}>; + entry = <${UBOOT_ENTRYPOINT}>; + signature { + algo = "${uboot_csum},${uboot_sign_algo}"; + key-name-hint = "${uboot_sign_keyname}"; + }; + }; + fdt { + description = "U-Boot FDT"; + data = /incbin/("${uboot_dtb}"); + type = "flat_dt"; + arch = "${UBOOT_ARCH}"; + compression = "none"; + signature { + algo = "${uboot_csum},${uboot_sign_algo}"; + key-name-hint = "${uboot_sign_keyname}"; + }; + }; + }; + + configurations { + default = "conf"; + conf { + description = "Boot with signed U-Boot FIT"; + loadables = "uboot"; + fdt = "fdt"; + }; + }; +}; +EOF + + # + # Assemble the U-boot FIT image + # + ${UBOOT_MKIMAGE} \ + ${@'-D "${UBOOT_MKIMAGE_DTCOPTS}"' if len('${UBOOT_MKIMAGE_DTCOPTS}') else ''} \ + -f ${uboot_its} \ + ${uboot_bin} + + # + # Sign the U-boot FIT image and add public key to SPL dtb + # + ${UBOOT_MKIMAGE_SIGN} \ + ${@'-D "${UBOOT_MKIMAGE_DTCOPTS}"' if len('${UBOOT_MKIMAGE_DTCOPTS}') else ''} \ + -F -k "${UBOOT_SIGN_KEYDIR}" \ + -K "${spl_dtb}" \ + -r ${uboot_bin} \ + ${UBOOT_MKIMAGE_SIGN_ARGS} + +} + +do_uboot_assemble_fitimage() { + # This function runs in both UBOOT_PN as well as KERNEL_PN contexts. The reason + # for that is that we need to be able to support SPL verified boot standalone, + # as well as in the scenario where U-boot verified boot is enabled. On the latter + # case, we can only sign our U-BOOT fit after the KERNEL_PN signed the fitimage, + # as well as placed the pubkey in the U-boot DTB. Note that the Signed U-boot + # FIT and SPL with the pubkey will only be available in the deploy dir, not on + # the u-boot package + if [ "${SPL_SIGN_ENABLE}" = "1" -a -n "${SPL_DTB_BINARY}" ] ; then + if [ "${PN}" = "${UBOOT_PN}" ] ; then + if [ -n "${UBOOT_CONFIG}" ]; then + for config in ${UBOOT_MACHINE}; do + cd ${B}/${config} + uboot_fitimage_assemble ${UBOOT_ITS} \ + ${UBOOT_NODTB_BINARY} \ + ${UBOOT_DTB_BINARY} \ + ${UBOOT_FITIMAGE_BINARY}\ + ${SPL_DIR}/${SPL_DTB_BINARY} + done + else + cd ${B} + uboot_fitimage_assemble ${UBOOT_ITS} ${UBOOT_NODTB_BINARY} \ + ${UBOOT_DTB_BINARY} \ + ${UBOOT_FITIMAGE_BINARY} \ + ${SPL_DIR}/${SPL_DTB_BINARY} + fi + elif [ "${UBOOT_SIGN_ENABLE}" = "1" -a "${PN}" = "${KERNEL_PN}" ] ; then + # As we are in the kernel context, we need to copy u-boot-spl.dtb from staging first. + # Unfortunately, need to glob on top of ${SPL_DTB_BINARY} since _IMAGE and _SYMLINK + # will contain U-boot's PV + # Similarly, we need to get the filename for the 'stub' u-boot-fitimage + its in + # staging so that we can use it for creating the image with the correct filename + # in the KERNEL_PN context. + # As for the u-boot.dtb (with fitimage's pubkey), it should come from the dependent + # do_assemble_fitimage task + cp -P ${STAGING_DATADIR}/u-boot-nodtb*.bin ${B} + kernel_uboot_fitimage_name=`basename ${STAGING_DATADIR}/u-boot-fitImage-*` + kernel_uboot_its_name=`basename ${STAGING_DATADIR}/u-boot-its-*` + cd ${B} + uboot_fitimage_assemble ${kernel_uboot_its_name} ${UBOOT_NODTB_BINARY} \ + ${UBOOT_DTB_BINARY} ${kernel_uboot_fitimage_name} \ + ${SPL_DTB_BINARY} fi fi } +addtask uboot_assemble_fitimage before do_deploy after do_compile + do_deploy_prepend_pn-${UBOOT_PN}() { - if [ "${UBOOT_SIGN_ENABLE}" = "1" -a -n "${UBOOT_DTB_BINARY}" ]; then + if [ "${UBOOT_SIGN_ENABLE}" = "1" -a -n "${UBOOT_DTB_BINARY}" ] ; then concat_dtb fi + if [ "${SPL_SIGN_ENABLE}" = "1" -a -n "${SPL_DTB_BINARY}" ] ; then + concat_spl_dtb + fi +} + +do_deploy_append_pn-${UBOOT_PN}() { + if [ "${SPL_SIGN_ENABLE}" = "1" -a "${UBOOT_SIGN_ENABLE}" != "1" ] ; then + # Only deploy u-boot-fitimage and its file + # if the KERNEL_PN is not already doing so + echo "Copying u-boot-fitimage file..." + install -m 0644 ${B}/${UBOOT_FITIMAGE_BINARY} ${DEPLOYDIR}/${UBOOT_FITIMAGE_IMAGE} + echo "Copying u-boot-its file..." + install -m 0644 ${B}/${UBOOT_ITS} ${DEPLOYDIR}/${UBOOT_ITS_IMAGE} + fi + ln -sf ${UBOOT_FITIMAGE_IMAGE} ${DEPLOYDIR}/${UBOOT_FITIMAGE_BINARY} + ln -sf ${UBOOT_FITIMAGE_IMAGE} ${DEPLOYDIR}/${UBOOT_FITIMAGE_SYMLINK} + ln -sf ${UBOOT_ITS_IMAGE} ${DEPLOYDIR}/${UBOOT_ITS} + ln -sf ${UBOOT_ITS_IMAGE} ${DEPLOYDIR}/${UBOOT_ITS_SYMLINK} } python () { if d.getVar('UBOOT_SIGN_ENABLE') == '1' and d.getVar('PN') == d.getVar('UBOOT_PN') and d.getVar('UBOOT_DTB_BINARY'): - kernel_pn = d.getVar('PREFERRED_PROVIDER_virtual/kernel') # Make "bitbake u-boot -cdeploy" deploys the signed u-boot.dtb - d.appendVarFlag('do_deploy', 'depends', ' %s:do_deploy' % kernel_pn) + d.appendVarFlag('do_deploy', 'depends', ' %s:do_deploy' % d.getVar('KERNEL_PN')) + + if d.getVar('SPL_SIGN_ENABLE') == '1' and d.getVar('UBOOT_SIGN_ENABLE') == '1' and d.getVar('PN') == d.getVar('KERNEL_PN'): + # if we're signing both U-Boot and Kernel fitImages, need to + # run uboot_assemble_fitimage after the kernel assembles theirs + if d.getVar('INITRAMFS_IMAGE_BUNDLE') == "1": + d.appendVarFlag('do_uboot_assemble_fitimage', 'depends', ' %s:do_assemble_fitimage_initramfs' % d.getVar('KERNEL_PN')) + else: + d.appendVarFlag('do_uboot_assemble_fitimage', 'depends', ' %s:do_assemble_fitimage' % d.getVar('KERNEL_PN')) + } -- 2.25.1
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