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) $@ 17 18ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y) 19 20$(eval $(call config_filename,SYSTEM_TRUSTED_KEYS)) 21 22# GCC doesn't include .incbin files in -MD generated dependencies (PR#66871) 23$(obj)/system_certificates.o: $(obj)/x509_certificate_list 24 25# Cope with signing_key.x509 existing in $(srctree) not $(objtree) 26AFLAGS_system_certificates.o := -I$(srctree) 27 28targets += x509_certificate_list 29$(obj)/x509_certificate_list: scripts/extract-cert $(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(SYSTEM_TRUSTED_KEYS_FILENAME) FORCE 30 $(call if_changed,extract_certs,$(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_TRUSTED_KEYS)) 31endif # CONFIG_SYSTEM_TRUSTED_KEYRING 32 33clean-files := x509_certificate_list .x509.list x509_revocation_list 34 35ifeq ($(CONFIG_MODULE_SIG),y) 36 SIGN_KEY = y 37endif 38 39ifeq ($(CONFIG_IMA_APPRAISE_MODSIG),y) 40ifeq ($(CONFIG_MODULES),y) 41 SIGN_KEY = y 42endif 43endif 44 45ifdef SIGN_KEY 46############################################################################### 47# 48# If module signing is requested, say by allyesconfig, but a key has not been 49# supplied, then one will need to be generated to make sure the build does not 50# fail and that the kernel may be used afterwards. 51# 52############################################################################### 53 54# We do it this way rather than having a boolean option for enabling an 55# external private key, because 'make randconfig' might enable such a 56# boolean option and we unfortunately can't make it depend on !RANDCONFIG. 57ifeq ($(CONFIG_MODULE_SIG_KEY),"certs/signing_key.pem") 58 59keytype-$(CONFIG_MODULE_SIG_KEY_TYPE_ECDSA) := -newkey ec -pkeyopt ec_paramgen_curve:secp384r1 60 61quiet_cmd_gen_key = GENKEY $@ 62 cmd_gen_key = openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \ 63 -batch -x509 -config $< \ 64 -outform PEM -out $@ -keyout $@ $(keytype-y) 2>&1 65 66$(obj)/signing_key.pem: $(obj)/x509.genkey FORCE 67 $(call if_changed,gen_key) 68 69targets += signing_key.pem 70 71quiet_cmd_copy_x509_config = COPY $@ 72 cmd_copy_x509_config = cat $(srctree)/$(src)/default_x509.genkey > $@ 73 74# You can provide your own config file. If not present, copy the default one. 75$(obj)/x509.genkey: 76 $(call cmd,copy_x509_config) 77 78endif # CONFIG_MODULE_SIG_KEY 79 80$(eval $(call config_filename,MODULE_SIG_KEY)) 81 82# If CONFIG_MODULE_SIG_KEY isn't a PKCS#11 URI, depend on it 83ifeq ($(patsubst pkcs11:%,%,$(firstword $(MODULE_SIG_KEY_FILENAME))),$(firstword $(MODULE_SIG_KEY_FILENAME))) 84X509_DEP := $(MODULE_SIG_KEY_SRCPREFIX)$(MODULE_SIG_KEY_FILENAME) 85endif 86 87# GCC PR#66871 again. 88$(obj)/system_certificates.o: $(obj)/signing_key.x509 89 90targets += signing_key.x509 91$(obj)/signing_key.x509: scripts/extract-cert $(X509_DEP) FORCE 92 $(call if_changed,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY)) 93endif # CONFIG_MODULE_SIG 94 95ifeq ($(CONFIG_SYSTEM_REVOCATION_LIST),y) 96 97$(eval $(call config_filename,SYSTEM_REVOCATION_KEYS)) 98 99$(obj)/revocation_certificates.o: $(obj)/x509_revocation_list 100 101targets += x509_revocation_list 102$(obj)/x509_revocation_list: scripts/extract-cert $(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(SYSTEM_REVOCATION_KEYS_FILENAME) FORCE 103 $(call if_changed,extract_certs,$(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_REVOCATION_KEYS)) 104endif 105