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