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# By default, sign all .efi binaries in ${B} after compiling and before deploying
SIGNING_DIR ?= "${B}"
SIGNING_BINARIES ?= "*.efi"
SIGN_AFTER ?= "do_compile"
SIGN_BEFORE ?= "do_deploy"
python () {
import os
import hashlib
# Ensure that if the signing key or cert change, we rerun the uefiapp process
if bb.utils.contains('IMAGE_FEATURES', 'secureboot', True, False, d):
for varname in ('SECURE_BOOT_SIGNING_CERT', 'SECURE_BOOT_SIGNING_KEY'):
filename = d.getVar(varname)
if filename is None:
bb.fatal('%s is not set.' % varname)
if not os.path.isfile(filename):
bb.fatal('%s=%s is not a file.' % (varname, filename))
with open(filename, 'rb') as f:
data = f.read()
hash = hashlib.sha256(data).hexdigest()
d.setVar('%s_HASH' % varname, hash)
# Must reparse and thus rehash on file changes.
bb.parse.mark_dependency(d, filename)
bb.build.addtask('uefi_sign', d.getVar('SIGN_BEFORE'), d.getVar('SIGN_AFTER'), d)
# Original binary needs to be regenerated if the hash changes since we overwrite it
# SIGN_AFTER isn't necessarily when it gets generated, but its our best guess
d.appendVarFlag(d.getVar('SIGN_AFTER'), 'vardeps', 'SECURE_BOOT_SIGNING_CERT_HASH SECURE_BOOT_SIGNING_KEY_HASH')
}
do_uefi_sign() {
if [ -f ${SECURE_BOOT_SIGNING_KEY} ] && [ -f ${SECURE_BOOT_SIGNING_CERT} ]; then
for i in `find ${SIGNING_DIR}/ -name '${SIGNING_BINARIES}'`; do
sbsign --key ${SECURE_BOOT_SIGNING_KEY} --cert ${SECURE_BOOT_SIGNING_CERT} $i
sbverify --cert ${SECURE_BOOT_SIGNING_CERT} $i.signed
mv $i.signed $i
done
fi
}
do_uefi_sign[depends] += "sbsigntool-native:do_populate_sysroot"
do_uefi_sign[vardeps] += "SECURE_BOOT_SIGNING_CERT_HASH \
SECURE_BOOT_SIGNING_KEY_HASH \
SIGNING_BINARIES SIGNING_DIR \
SIGN_BEFORE SIGN_AFTER \
"
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