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 $(extract-cert-in) $@ 17extract-cert-in = $(or $(filter-out $(obj)/extract-cert, $(real-prereqs)),"") 18 19$(obj)/system_certificates.o: $(obj)/x509_certificate_list 20 21$(obj)/x509_certificate_list: $(CONFIG_SYSTEM_TRUSTED_KEYS) $(obj)/extract-cert FORCE 22 $(call if_changed,extract_certs) 23 24targets += x509_certificate_list 25 26# If module signing is requested, say by allyesconfig, but a key has not been 27# supplied, then one will need to be generated to make sure the build does not 28# fail and that the kernel may be used afterwards. 29# 30# We do it this way rather than having a boolean option for enabling an 31# external private key, because 'make randconfig' might enable such a 32# boolean option and we unfortunately can't make it depend on !RANDCONFIG. 33ifeq ($(CONFIG_MODULE_SIG_KEY),certs/signing_key.pem) 34 35keytype-$(CONFIG_MODULE_SIG_KEY_TYPE_ECDSA) := -newkey ec -pkeyopt ec_paramgen_curve:secp384r1 36 37quiet_cmd_gen_key = GENKEY $@ 38 cmd_gen_key = openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \ 39 -batch -x509 -config $< \ 40 -outform PEM -out $@ -keyout $@ $(keytype-y) 2>&1 41 42$(obj)/signing_key.pem: $(obj)/x509.genkey FORCE 43 $(call if_changed,gen_key) 44 45targets += signing_key.pem 46 47quiet_cmd_copy_x509_config = COPY $@ 48 cmd_copy_x509_config = cat $(srctree)/$(src)/default_x509.genkey > $@ 49 50# You can provide your own config file. If not present, copy the default one. 51$(obj)/x509.genkey: 52 $(call cmd,copy_x509_config) 53 54endif # CONFIG_MODULE_SIG_KEY 55 56$(obj)/system_certificates.o: $(obj)/signing_key.x509 57 58PKCS11_URI := $(filter pkcs11:%, $(CONFIG_MODULE_SIG_KEY)) 59ifdef PKCS11_URI 60$(obj)/signing_key.x509: extract-cert-in := $(PKCS11_URI) 61endif 62 63$(obj)/signing_key.x509: $(filter-out $(PKCS11_URI),$(CONFIG_MODULE_SIG_KEY)) $(obj)/extract-cert FORCE 64 $(call if_changed,extract_certs) 65 66targets += signing_key.x509 67 68$(obj)/revocation_certificates.o: $(obj)/x509_revocation_list 69 70$(obj)/x509_revocation_list: $(CONFIG_SYSTEM_REVOCATION_KEYS) $(obj)/extract-cert FORCE 71 $(call if_changed,extract_certs) 72 73targets += x509_revocation_list 74 75hostprogs := extract-cert 76 77HOSTCFLAGS_extract-cert.o = $(shell pkg-config --cflags libcrypto 2> /dev/null) 78HOSTLDLIBS_extract-cert = $(shell pkg-config --libs libcrypto 2> /dev/null || echo -lcrypto) 79