1# SPDX-License-Identifier: GPL-2.0 2# 3# Makefile for the linux kernel signature checking certificates. 4# 5 6obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o common.o 7obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o common.o 8obj-$(CONFIG_SYSTEM_REVOCATION_LIST) += revocation_certificates.o 9ifneq ($(CONFIG_SYSTEM_BLACKLIST_HASH_LIST),) 10quiet_cmd_check_blacklist_hashes = CHECK $(patsubst "%",%,$(2)) 11 cmd_check_blacklist_hashes = $(AWK) -f $(srctree)/scripts/check-blacklist-hashes.awk $(2); touch $@ 12 13$(eval $(call config_filename,SYSTEM_BLACKLIST_HASH_LIST)) 14 15$(obj)/blacklist_hashes.o: $(obj)/blacklist_hashes_checked 16 17CFLAGS_blacklist_hashes.o += -I$(srctree) 18 19targets += blacklist_hashes_checked 20$(obj)/blacklist_hashes_checked: $(SYSTEM_BLACKLIST_HASH_LIST_SRCPREFIX)$(SYSTEM_BLACKLIST_HASH_LIST_FILENAME) scripts/check-blacklist-hashes.awk FORCE 21 $(call if_changed,check_blacklist_hashes,$(SYSTEM_BLACKLIST_HASH_LIST_SRCPREFIX)$(CONFIG_SYSTEM_BLACKLIST_HASH_LIST)) 22obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_hashes.o 23else 24obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_nohashes.o 25endif 26 27quiet_cmd_extract_certs = CERT $@ 28 cmd_extract_certs = $(obj)/extract-cert $(extract-cert-in) $@ 29extract-cert-in = $(or $(filter-out $(obj)/extract-cert, $(real-prereqs)),"") 30 31$(obj)/system_certificates.o: $(obj)/x509_certificate_list 32 33$(obj)/x509_certificate_list: $(CONFIG_SYSTEM_TRUSTED_KEYS) $(obj)/extract-cert FORCE 34 $(call if_changed,extract_certs) 35 36targets += x509_certificate_list blacklist_hashes_checked 37 38# If module signing is requested, say by allyesconfig, but a key has not been 39# supplied, then one will need to be generated to make sure the build does not 40# fail and that the kernel may be used afterwards. 41# 42# We do it this way rather than having a boolean option for enabling an 43# external private key, because 'make randconfig' might enable such a 44# boolean option and we unfortunately can't make it depend on !RANDCONFIG. 45ifeq ($(CONFIG_MODULE_SIG_KEY),certs/signing_key.pem) 46 47keytype-$(CONFIG_MODULE_SIG_KEY_TYPE_ECDSA) := -newkey ec -pkeyopt ec_paramgen_curve:secp384r1 48 49quiet_cmd_gen_key = GENKEY $@ 50 cmd_gen_key = openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \ 51 -batch -x509 -config $< \ 52 -outform PEM -out $@ -keyout $@ $(keytype-y) 2>&1 53 54$(obj)/signing_key.pem: $(obj)/x509.genkey FORCE 55 $(call if_changed,gen_key) 56 57targets += signing_key.pem 58 59quiet_cmd_copy_x509_config = COPY $@ 60 cmd_copy_x509_config = cat $(srctree)/$(src)/default_x509.genkey > $@ 61 62# You can provide your own config file. If not present, copy the default one. 63$(obj)/x509.genkey: 64 $(call cmd,copy_x509_config) 65 66endif # CONFIG_MODULE_SIG_KEY 67 68$(obj)/system_certificates.o: $(obj)/signing_key.x509 69 70PKCS11_URI := $(filter pkcs11:%, $(CONFIG_MODULE_SIG_KEY)) 71ifdef PKCS11_URI 72$(obj)/signing_key.x509: extract-cert-in := $(PKCS11_URI) 73endif 74 75$(obj)/signing_key.x509: $(filter-out $(PKCS11_URI),$(CONFIG_MODULE_SIG_KEY)) $(obj)/extract-cert FORCE 76 $(call if_changed,extract_certs) 77 78targets += signing_key.x509 79 80$(obj)/revocation_certificates.o: $(obj)/x509_revocation_list 81 82$(obj)/x509_revocation_list: $(CONFIG_SYSTEM_REVOCATION_KEYS) $(obj)/extract-cert FORCE 83 $(call if_changed,extract_certs) 84 85targets += x509_revocation_list 86 87hostprogs := extract-cert 88 89HOSTCFLAGS_extract-cert.o = $(shell $(HOSTPKG_CONFIG) --cflags libcrypto 2> /dev/null) 90HOSTLDLIBS_extract-cert = $(shell $(HOSTPKG_CONFIG) --libs libcrypto 2> /dev/null || echo -lcrypto) 91