1# SPDX-License-Identifier: GPL-2.0 2# 3# Makefile for the linux kernel signature checking certificates. 4# 5 6obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o 7obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o blacklist_hashes.o 8obj-$(CONFIG_SYSTEM_REVOCATION_LIST) += revocation_certificates.o 9 10$(obj)/blacklist_hashes.o: $(obj)/blacklist_hash_list 11CFLAGS_blacklist_hashes.o := -I $(obj) 12 13quiet_cmd_check_and_copy_blacklist_hash_list = GEN $@ 14 cmd_check_and_copy_blacklist_hash_list = \ 15 $(if $(CONFIG_SYSTEM_BLACKLIST_HASH_LIST), \ 16 $(AWK) -f $(srctree)/$(src)/check-blacklist-hashes.awk $(CONFIG_SYSTEM_BLACKLIST_HASH_LIST) >&2; \ 17 { cat $(CONFIG_SYSTEM_BLACKLIST_HASH_LIST); echo $(comma) NULL; } > $@, \ 18 echo NULL > $@) 19 20$(obj)/blacklist_hash_list: $(CONFIG_SYSTEM_BLACKLIST_HASH_LIST) FORCE 21 $(call if_changed,check_and_copy_blacklist_hash_list) 22 23targets += blacklist_hash_list 24 25quiet_cmd_extract_certs = CERT $@ 26 cmd_extract_certs = $(obj)/extract-cert $(extract-cert-in) $@ 27extract-cert-in = $(or $(filter-out $(obj)/extract-cert, $(real-prereqs)),"") 28 29$(obj)/system_certificates.o: $(obj)/x509_certificate_list 30 31$(obj)/x509_certificate_list: $(CONFIG_SYSTEM_TRUSTED_KEYS) $(obj)/extract-cert FORCE 32 $(call if_changed,extract_certs) 33 34targets += x509_certificate_list 35 36# If module signing is requested, say by allyesconfig, but a key has not been 37# supplied, then one will need to be generated to make sure the build does not 38# fail and that the kernel may be used afterwards. 39# 40# We do it this way rather than having a boolean option for enabling an 41# external private key, because 'make randconfig' might enable such a 42# boolean option and we unfortunately can't make it depend on !RANDCONFIG. 43ifeq ($(CONFIG_MODULE_SIG_KEY),certs/signing_key.pem) 44 45keytype-$(CONFIG_MODULE_SIG_KEY_TYPE_ECDSA) := -newkey ec -pkeyopt ec_paramgen_curve:secp384r1 46 47quiet_cmd_gen_key = GENKEY $@ 48 cmd_gen_key = openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \ 49 -batch -x509 -config $< \ 50 -outform PEM -out $@ -keyout $@ $(keytype-y) 2>&1 51 52$(obj)/signing_key.pem: $(obj)/x509.genkey FORCE 53 $(call if_changed,gen_key) 54 55targets += signing_key.pem 56 57quiet_cmd_copy_x509_config = COPY $@ 58 cmd_copy_x509_config = cat $(srctree)/$(src)/default_x509.genkey > $@ 59 60# You can provide your own config file. If not present, copy the default one. 61$(obj)/x509.genkey: 62 $(call cmd,copy_x509_config) 63 64endif # CONFIG_MODULE_SIG_KEY 65 66$(obj)/system_certificates.o: $(obj)/signing_key.x509 67 68PKCS11_URI := $(filter pkcs11:%, $(CONFIG_MODULE_SIG_KEY)) 69ifdef PKCS11_URI 70$(obj)/signing_key.x509: extract-cert-in := $(PKCS11_URI) 71endif 72 73$(obj)/signing_key.x509: $(filter-out $(PKCS11_URI),$(CONFIG_MODULE_SIG_KEY)) $(obj)/extract-cert FORCE 74 $(call if_changed,extract_certs) 75 76targets += signing_key.x509 77 78$(obj)/revocation_certificates.o: $(obj)/x509_revocation_list 79 80$(obj)/x509_revocation_list: $(CONFIG_SYSTEM_REVOCATION_KEYS) $(obj)/extract-cert FORCE 81 $(call if_changed,extract_certs) 82 83targets += x509_revocation_list 84 85hostprogs := extract-cert 86 87HOSTCFLAGS_extract-cert.o = $(shell $(HOSTPKG_CONFIG) --cflags libcrypto 2> /dev/null) 88HOSTLDLIBS_extract-cert = $(shell $(HOSTPKG_CONFIG) --libs libcrypto 2> /dev/null || echo -lcrypto) 89