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),) 10obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_hashes.o 11else 12obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_nohashes.o 13endif 14 15quiet_cmd_extract_certs = CERT $@ 16 cmd_extract_certs = $(obj)/extract-cert $(2) $@ 17 18$(obj)/system_certificates.o: $(obj)/x509_certificate_list 19 20$(obj)/x509_certificate_list: $(CONFIG_SYSTEM_TRUSTED_KEYS) $(obj)/extract-cert FORCE 21 $(call if_changed,extract_certs,$(if $(CONFIG_SYSTEM_TRUSTED_KEYS),$<,"")) 22 23targets += x509_certificate_list 24 25ifeq ($(CONFIG_MODULE_SIG),y) 26 SIGN_KEY = y 27endif 28 29ifeq ($(CONFIG_IMA_APPRAISE_MODSIG),y) 30ifeq ($(CONFIG_MODULES),y) 31 SIGN_KEY = y 32endif 33endif 34 35ifdef SIGN_KEY 36############################################################################### 37# 38# If module signing is requested, say by allyesconfig, but a key has not been 39# supplied, then one will need to be generated to make sure the build does not 40# fail and that the kernel may be used afterwards. 41# 42############################################################################### 43 44# We do it this way rather than having a boolean option for enabling an 45# external private key, because 'make randconfig' might enable such a 46# boolean option and we unfortunately can't make it depend on !RANDCONFIG. 47ifeq ($(CONFIG_MODULE_SIG_KEY),certs/signing_key.pem) 48 49keytype-$(CONFIG_MODULE_SIG_KEY_TYPE_ECDSA) := -newkey ec -pkeyopt ec_paramgen_curve:secp384r1 50 51quiet_cmd_gen_key = GENKEY $@ 52 cmd_gen_key = openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \ 53 -batch -x509 -config $< \ 54 -outform PEM -out $@ -keyout $@ $(keytype-y) 2>&1 55 56$(obj)/signing_key.pem: $(obj)/x509.genkey FORCE 57 $(call if_changed,gen_key) 58 59targets += signing_key.pem 60 61quiet_cmd_copy_x509_config = COPY $@ 62 cmd_copy_x509_config = cat $(srctree)/$(src)/default_x509.genkey > $@ 63 64# You can provide your own config file. If not present, copy the default one. 65$(obj)/x509.genkey: 66 $(call cmd,copy_x509_config) 67 68endif # CONFIG_MODULE_SIG_KEY 69 70# If CONFIG_MODULE_SIG_KEY isn't a PKCS#11 URI, depend on it 71ifneq ($(filter-out pkcs11:%, $(CONFIG_MODULE_SIG_KEY)),) 72X509_DEP := $(CONFIG_MODULE_SIG_KEY) 73endif 74 75$(obj)/system_certificates.o: $(obj)/signing_key.x509 76 77$(obj)/signing_key.x509: $(X509_DEP) $(obj)/extract-cert FORCE 78 $(call if_changed,extract_certs,$(if $(CONFIG_MODULE_SIG_KEY),$(if $(X509_DEP),$<,$(CONFIG_MODULE_SIG_KEY)),"")) 79endif # CONFIG_MODULE_SIG 80 81targets += signing_key.x509 82 83$(obj)/revocation_certificates.o: $(obj)/x509_revocation_list 84 85$(obj)/x509_revocation_list: $(CONFIG_SYSTEM_REVOCATION_KEYS) $(obj)/extract-cert FORCE 86 $(call if_changed,extract_certs,$(if $(CONFIG_SYSTEM_REVOCATION_KEYS),$<,"")) 87 88targets += x509_revocation_list 89 90hostprogs := extract-cert 91 92HOSTCFLAGS_extract-cert.o = $(shell pkg-config --cflags libcrypto 2> /dev/null) 93HOSTLDLIBS_extract-cert = $(shell pkg-config --libs libcrypto 2> /dev/null || echo -lcrypto) 94