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 = scripts/extract-cert $(2) $@ 17 18$(obj)/system_certificates.o: $(obj)/x509_certificate_list 19 20CONFIG_SYSTEM_TRUSTED_KEYS := $(CONFIG_SYSTEM_TRUSTED_KEYS:"%"=%) 21 22$(obj)/x509_certificate_list: $(CONFIG_SYSTEM_TRUSTED_KEYS) scripts/extract-cert FORCE 23 $(call if_changed,extract_certs,$(if $(CONFIG_SYSTEM_TRUSTED_KEYS),$<,"")) 24 25targets += x509_certificate_list 26 27ifeq ($(CONFIG_MODULE_SIG),y) 28 SIGN_KEY = y 29endif 30 31ifeq ($(CONFIG_IMA_APPRAISE_MODSIG),y) 32ifeq ($(CONFIG_MODULES),y) 33 SIGN_KEY = y 34endif 35endif 36 37ifdef SIGN_KEY 38############################################################################### 39# 40# If module signing is requested, say by allyesconfig, but a key has not been 41# supplied, then one will need to be generated to make sure the build does not 42# fail and that the kernel may be used afterwards. 43# 44############################################################################### 45 46# We do it this way rather than having a boolean option for enabling an 47# external private key, because 'make randconfig' might enable such a 48# boolean option and we unfortunately can't make it depend on !RANDCONFIG. 49ifeq ($(CONFIG_MODULE_SIG_KEY),"certs/signing_key.pem") 50 51keytype-$(CONFIG_MODULE_SIG_KEY_TYPE_ECDSA) := -newkey ec -pkeyopt ec_paramgen_curve:secp384r1 52 53quiet_cmd_gen_key = GENKEY $@ 54 cmd_gen_key = openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \ 55 -batch -x509 -config $< \ 56 -outform PEM -out $@ -keyout $@ $(keytype-y) 2>&1 57 58$(obj)/signing_key.pem: $(obj)/x509.genkey FORCE 59 $(call if_changed,gen_key) 60 61targets += signing_key.pem 62 63quiet_cmd_copy_x509_config = COPY $@ 64 cmd_copy_x509_config = cat $(srctree)/$(src)/default_x509.genkey > $@ 65 66# You can provide your own config file. If not present, copy the default one. 67$(obj)/x509.genkey: 68 $(call cmd,copy_x509_config) 69 70endif # CONFIG_MODULE_SIG_KEY 71 72CONFIG_MODULE_SIG_KEY := $(CONFIG_MODULE_SIG_KEY:"%"=%) 73 74# If CONFIG_MODULE_SIG_KEY isn't a PKCS#11 URI, depend on it 75ifneq ($(filter-out pkcs11:%, %(CONFIG_MODULE_SIG_KEY)),) 76X509_DEP := $(CONFIG_MODULE_SIG_KEY) 77endif 78 79$(obj)/system_certificates.o: $(obj)/signing_key.x509 80 81$(obj)/signing_key.x509: $(X509_DEP) scripts/extract-cert FORCE 82 $(call if_changed,extract_certs,$(if $(X509_DEP),$<,$(CONFIG_MODULE_SIG_KEY))) 83endif # CONFIG_MODULE_SIG 84 85targets += signing_key.x509 86 87$(obj)/revocation_certificates.o: $(obj)/x509_revocation_list 88 89CONFIG_SYSTEM_REVOCATION_KEYS := $(CONFIG_SYSTEM_REVOCATION_KEYS:"%"=%) 90 91$(obj)/x509_revocation_list: $(CONFIG_SYSTEM_REVOCATION_KEYS) scripts/extract-cert FORCE 92 $(call if_changed,extract_certs,$(if $(CONFIG_SYSTEM_REVOCATION_KEYS),$<,"")) 93 94targets += x509_revocation_list 95