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Masahiro Yamada f3a2ba44e9 certs: check-in the default x509 config file

When x509.genkey is created, it prints a log:

  Generating X.509 key generation config

..., which is not the ordinary Kbuild log style.

Check-in the default config as certs/default_x509.genkey to make it
readable, and copy it to certs/x509.genkey if it is not present.

The log is shown in the Kbuild style.

  COPY    certs/x509.genkey

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

2021-12-11 22:09:14 +09:00

5.0 KiB

Raw Blame History

SPDX-License-Identifier: GPL-2.0

Makefile for the linux kernel signature checking certificates.

obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o common.o obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o common.o obj-$(CONFIG_SYSTEM_REVOCATION_LIST) += revocation_certificates.o ifneq ($(CONFIG_SYSTEM_BLACKLIST_HASH_LIST),"") obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_hashes.o else obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_nohashes.o endif

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) $@

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 x509_revocation_list

ifeq ($(CONFIG_MODULE_SIG),y) SIGN_KEY = y endif

ifeq ($(CONFIG_IMA_APPRAISE_MODSIG),y) ifeq ($(CONFIG_MODULES),y) SIGN_KEY = y endif endif

ifdef SIGN_KEY ###############################################################################

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.

###############################################################################

redirect_openssl = 2>&1 quiet_redirect_openssl = 2>&1 silent_redirect_openssl = 2>/dev/null openssl_available = $(shell openssl help 2>/dev/null && echo yes)

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")

ifeq ($(openssl_available),yes) X509TEXT=$(shell openssl x509 -in "certs/signing_key.pem" -text 2>/dev/null) endif

Support user changing key type

ifdef CONFIG_MODULE_SIG_KEY_TYPE_ECDSA keytype_openssl = -newkey ec -pkeyopt ec_paramgen_curve:secp384r1 ifeq ($(openssl_available),yes) $(if $(findstring id-ecPublicKey,$(X509TEXT)),,$(shell rm -f "certs/signing_key.pem")) endif endif # CONFIG_MODULE_SIG_KEY_TYPE_ECDSA

ifdef CONFIG_MODULE_SIG_KEY_TYPE_RSA ifeq ($(openssl_available),yes) $(if $(findstring rsaEncryption,$(X509TEXT)),,$(shell rm -f "certs/signing_key.pem")) endif endif # CONFIG_MODULE_SIG_KEY_TYPE_RSA

$(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
$(keytype_openssl)
$($(quiet)redirect_openssl) @$(kecho) "###" @$(kecho) "### Key pair generated." @$(kecho) "###"

quiet_cmd_copy_x509_config = COPY $@ cmd_copy_x509_config = cat $(srctree)/$(src)/default_x509.genkey > $@

You can provide your own config file. If not present, copy the default one.

$(obj)/x509.genkey: $(call cmd,copy_x509_config)

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 it

ifeq ($(patsubst pkcs11:%,%,$(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

ifeq ($(CONFIG_SYSTEM_REVOCATION_LIST),y)

$(eval $(call config_filename,SYSTEM_REVOCATION_KEYS))

$(obj)/revocation_certificates.o: $(obj)/x509_revocation_list