## Makefile for the linux kernel signature checking certificates.# obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.oobj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.oifneq ($(CONFIG_SYSTEM_BLACKLIST_HASH_LIST),"")obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_hashes.oelseobj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_nohashes.oendif ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y) $(eval $(call config_filename,SYSTEM_TRUSTED_KEYS)) # GCC doesn't include .incbin files in -MD generated dependencies (PR#66871)$(obj)/system_certificates.o: $(obj)/x509_certificate_list # Cope with signing_key.x509 existing in $(srctree) not $(objtree)AFLAGS_system_certificates.o := -I$(srctree) quiet_cmd_extract_certs  = EXTRACT_CERTS   $(patsubst "%",%,$(2))      cmd_extract_certs  = scripts/extract-cert $(2) $@ || ( rm $@; exit 1) targets += x509_certificate_list$(obj)/x509_certificate_list: scripts/extract-cert $(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(SYSTEM_TRUSTED_KEYS_FILENAME) FORCE	$(call if_changed,extract_certs,$(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_TRUSTED_KEYS))endif # CONFIG_SYSTEM_TRUSTED_KEYRING clean-files := x509_certificate_list .x509.list ifeq ($(CONFIG_MODULE_SIG),y)################################################################################# If module signing is requested, say by allyesconfig, but a key has not been# supplied, then one will need to be generated to make sure the build does not# fail and that the kernel may be used afterwards.################################################################################ifndef CONFIG_MODULE_SIG_HASH$(error Could not determine digest type to use from kernel config)endif redirect_openssl	= 2>&1quiet_redirect_openssl	= 2>&1silent_redirect_openssl = 2>/dev/null # We do it this way rather than having a boolean option for enabling an# external private key, because 'make randconfig' might enable such a# boolean option and we unfortunately can't make it depend on !RANDCONFIG.ifeq ($(CONFIG_MODULE_SIG_KEY),"certs/signing_key.pem")$(obj)/signing_key.pem: $(obj)/x509.genkey	@$(kecho) "###"	@$(kecho) "### Now generating an X.509 key pair to be used for signing modules."	@$(kecho) "###"	@$(kecho) "### If this takes a long time, you might wish to run rngd in the"	@$(kecho) "### background to keep the supply of entropy topped up.  It"	@$(kecho) "### needs to be run as root, and uses a hardware random"	@$(kecho) "### number generator if one is available."	@$(kecho) "###"	$(Q)openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \		-batch -x509 -config $(obj)/x509.genkey \		-outform PEM -out $(obj)/signing_key.pem \		-keyout $(obj)/signing_key.pem \		$($(quiet)redirect_openssl)	@$(kecho) "###"	@$(kecho) "### Key pair generated."	@$(kecho) "###" $(obj)/x509.genkey:	@$(kecho) Generating X.509 key generation config	@echo  >$@ "[ req ]"	@echo >>$@ "default_bits = 4096"	@echo >>$@ "distinguished_name = req_distinguished_name"	@echo >>$@ "prompt = no"	@echo >>$@ "string_mask = utf8only"	@echo >>$@ "x509_extensions = myexts"	@echo >>$@	@echo >>$@ "[ req_distinguished_name ]"	@echo >>$@ "#O = Unspecified company"	@echo >>$@ "CN = Build time autogenerated kernel key"	@echo >>$@ "#emailAddress = unspecified.user@unspecified.company"	@echo >>$@	@echo >>$@ "[ myexts ]"	@echo >>$@ "basicConstraints=critical,CA:FALSE"	@echo >>$@ "keyUsage=digitalSignature"	@echo >>$@ "subjectKeyIdentifier=hash"	@echo >>$@ "authorityKeyIdentifier=keyid"endif # CONFIG_MODULE_SIG_KEY $(eval $(call config_filename,MODULE_SIG_KEY)) # If CONFIG_MODULE_SIG_KEY isn't a PKCS#11 URI, depend on itifeq ($(patsubst pkcs11:%,%,$(firstword $(MODULE_SIG_KEY_FILENAME))),$(firstword $(MODULE_SIG_KEY_FILENAME)))X509_DEP := $(MODULE_SIG_KEY_SRCPREFIX)$(MODULE_SIG_KEY_FILENAME)endif # GCC PR#66871 again.$(obj)/system_certificates.o: $(obj)/signing_key.x509 targets += signing_key.x509$(obj)/signing_key.x509: scripts/extract-cert $(X509_DEP) FORCE	$(call if_changed,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY))endif # CONFIG_MODULE_SIG