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# SPDX-License-Identifier: GPL-2.0
#
# Makefile for the linux kernel signature checking certificates.
#
obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o
obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o blacklist_hashes.o
obj-$(CONFIG_SYSTEM_REVOCATION_LIST) += revocation_certificates.o
$(obj)/blacklist_hashes.o: $(obj)/blacklist_hash_list
CFLAGS_blacklist_hashes.o := -I $(obj)
quiet_cmd_check_and_copy_blacklist_hash_list = GEN $@
cmd_check_and_copy_blacklist_hash_list = \
$(if $(CONFIG_SYSTEM_BLACKLIST_HASH_LIST), \
$(AWK) -f $(srctree)/$(src)/check-blacklist-hashes.awk $(CONFIG_SYSTEM_BLACKLIST_HASH_LIST) >&2; \
{ cat $(CONFIG_SYSTEM_BLACKLIST_HASH_LIST); echo $(comma) NULL; } > $@, \
echo NULL > $@)
$(obj)/blacklist_hash_list: $(CONFIG_SYSTEM_BLACKLIST_HASH_LIST) FORCE
$(call if_changed,check_and_copy_blacklist_hash_list)
targets += blacklist_hash_list
quiet_cmd_extract_certs = CERT $@
cmd_extract_certs = $(obj)/extract-cert $(extract-cert-in) $@
extract-cert-in = $(or $(filter-out $(obj)/extract-cert, $(real-prereqs)),"")
$(obj)/system_certificates.o: $(obj)/x509_certificate_list
$(obj)/x509_certificate_list: $(CONFIG_SYSTEM_TRUSTED_KEYS) $(obj)/extract-cert FORCE
$(call if_changed,extract_certs)
targets += x509_certificate_list
# If module signing is requested, say by allyesconfig, but a key has not been
# supplied, then one will need to be generated to make sure the build does not
# fail and that the kernel may be used afterwards.
#
# We do it this way rather than having a boolean option for enabling an
# external private key, because 'make randconfig' might enable such a
# boolean option and we unfortunately can't make it depend on !RANDCONFIG.
ifeq ($(CONFIG_MODULE_SIG_KEY),certs/signing_key.pem)
keytype-$(CONFIG_MODULE_SIG_KEY_TYPE_ECDSA) := -newkey ec -pkeyopt ec_paramgen_curve:secp384r1
quiet_cmd_gen_key = GENKEY $@
cmd_gen_key = openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
-batch -x509 -config $< \
-outform PEM -out $@ -keyout $@ $(keytype-y) 2>&1
$(obj)/signing_key.pem: $(obj)/x509.genkey FORCE
$(call if_changed,gen_key)
targets += signing_key.pem
quiet_cmd_copy_x509_config = COPY $@
cmd_copy_x509_config = cat $(srctree)/$(src)/default_x509.genkey > $@
# You can provide your own config file. If not present, copy the default one.
$(obj)/x509.genkey:
$(call cmd,copy_x509_config)
endif # CONFIG_MODULE_SIG_KEY
$(obj)/system_certificates.o: $(obj)/signing_key.x509
PKCS11_URI := $(filter pkcs11:%, $(CONFIG_MODULE_SIG_KEY))
ifdef PKCS11_URI
$(obj)/signing_key.x509: extract-cert-in := $(PKCS11_URI)
endif
$(obj)/signing_key.x509: $(filter-out $(PKCS11_URI),$(CONFIG_MODULE_SIG_KEY)) $(obj)/extract-cert FORCE
$(call if_changed,extract_certs)
targets += signing_key.x509
$(obj)/revocation_certificates.o: $(obj)/x509_revocation_list
$(obj)/x509_revocation_list: $(CONFIG_SYSTEM_REVOCATION_KEYS) $(obj)/extract-cert FORCE
$(call if_changed,extract_certs)
targets += x509_revocation_list
hostprogs := extract-cert
HOSTCFLAGS_extract-cert.o = $(shell $(HOSTPKG_CONFIG) --cflags libcrypto 2> /dev/null)
HOSTLDLIBS_extract-cert = $(shell $(HOSTPKG_CONFIG) --libs libcrypto 2> /dev/null || echo -lcrypto)
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