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 15ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y) 16 17$(eval $(call config_filename,SYSTEM_TRUSTED_KEYS)) 18 19# GCC doesn't include .incbin files in -MD generated dependencies (PR#66871) 20$(obj)/system_certificates.o: $(obj)/x509_certificate_list 21 22# Cope with signing_key.x509 existing in $(srctree) not $(objtree) 23AFLAGS_system_certificates.o := -I$(srctree) 24 25quiet_cmd_extract_certs = EXTRACT_CERTS $(patsubst "%",%,$(2)) 26 cmd_extract_certs = scripts/extract-cert $(2) $@ 27 28targets += x509_certificate_list 29$(obj)/x509_certificate_list: scripts/extract-cert $(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(SYSTEM_TRUSTED_KEYS_FILENAME) FORCE 30 $(call if_changed,extract_certs,$(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_TRUSTED_KEYS)) 31endif # CONFIG_SYSTEM_TRUSTED_KEYRING 32 33clean-files := x509_certificate_list .x509.list x509_revocation_list 34 35ifeq ($(CONFIG_MODULE_SIG),y) 36 SIGN_KEY = y 37endif 38 39ifeq ($(CONFIG_IMA_APPRAISE_MODSIG),y) 40ifeq ($(CONFIG_MODULES),y) 41 SIGN_KEY = y 42endif 43endif 44 45ifdef SIGN_KEY 46############################################################################### 47# 48# If module signing is requested, say by allyesconfig, but a key has not been 49# supplied, then one will need to be generated to make sure the build does not 50# fail and that the kernel may be used afterwards. 51# 52############################################################################### 53 54redirect_openssl = 2>&1 55quiet_redirect_openssl = 2>&1 56silent_redirect_openssl = 2>/dev/null 57openssl_available = $(shell openssl help 2>/dev/null && echo yes) 58 59# We do it this way rather than having a boolean option for enabling an 60# external private key, because 'make randconfig' might enable such a 61# boolean option and we unfortunately can't make it depend on !RANDCONFIG. 62ifeq ($(CONFIG_MODULE_SIG_KEY),"certs/signing_key.pem") 63 64ifeq ($(openssl_available),yes) 65X509TEXT=$(shell openssl x509 -in "certs/signing_key.pem" -text 2>/dev/null) 66endif 67 68# Support user changing key type 69ifdef CONFIG_MODULE_SIG_KEY_TYPE_ECDSA 70keytype_openssl = -newkey ec -pkeyopt ec_paramgen_curve:secp384r1 71ifeq ($(openssl_available),yes) 72$(if $(findstring id-ecPublicKey,$(X509TEXT)),,$(shell rm -f "certs/signing_key.pem")) 73endif 74endif # CONFIG_MODULE_SIG_KEY_TYPE_ECDSA 75 76ifdef CONFIG_MODULE_SIG_KEY_TYPE_RSA 77ifeq ($(openssl_available),yes) 78$(if $(findstring rsaEncryption,$(X509TEXT)),,$(shell rm -f "certs/signing_key.pem")) 79endif 80endif # CONFIG_MODULE_SIG_KEY_TYPE_RSA 81 82$(obj)/signing_key.pem: $(obj)/x509.genkey 83 $(Q)openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \ 84 -batch -x509 -config $(obj)/x509.genkey \ 85 -outform PEM -out $(obj)/signing_key.pem \ 86 -keyout $(obj)/signing_key.pem \ 87 $(keytype_openssl) \ 88 $($(quiet)redirect_openssl) 89 90quiet_cmd_copy_x509_config = COPY $@ 91 cmd_copy_x509_config = cat $(srctree)/$(src)/default_x509.genkey > $@ 92 93# You can provide your own config file. If not present, copy the default one. 94$(obj)/x509.genkey: 95 $(call cmd,copy_x509_config) 96 97endif # CONFIG_MODULE_SIG_KEY 98 99$(eval $(call config_filename,MODULE_SIG_KEY)) 100 101# If CONFIG_MODULE_SIG_KEY isn't a PKCS#11 URI, depend on it 102ifeq ($(patsubst pkcs11:%,%,$(firstword $(MODULE_SIG_KEY_FILENAME))),$(firstword $(MODULE_SIG_KEY_FILENAME))) 103X509_DEP := $(MODULE_SIG_KEY_SRCPREFIX)$(MODULE_SIG_KEY_FILENAME) 104endif 105 106# GCC PR#66871 again. 107$(obj)/system_certificates.o: $(obj)/signing_key.x509 108 109targets += signing_key.x509 110$(obj)/signing_key.x509: scripts/extract-cert $(X509_DEP) FORCE 111 $(call if_changed,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY)) 112endif # CONFIG_MODULE_SIG 113 114ifeq ($(CONFIG_SYSTEM_REVOCATION_LIST),y) 115 116$(eval $(call config_filename,SYSTEM_REVOCATION_KEYS)) 117 118$(obj)/revocation_certificates.o: $(obj)/x509_revocation_list 119 120quiet_cmd_extract_certs = EXTRACT_CERTS $(patsubst "%",%,$(2)) 121 cmd_extract_certs = scripts/extract-cert $(2) $@ 122 123targets += x509_revocation_list 124$(obj)/x509_revocation_list: scripts/extract-cert $(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(SYSTEM_REVOCATION_KEYS_FILENAME) FORCE 125 $(call if_changed,extract_certs,$(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_REVOCATION_KEYS)) 126endif 127