1 # SPDX-License-Identifier: GPL-2.0
3 # Makefile for the linux kernel signature checking certificates.
6 obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o common.o
7 obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o common.o
8 obj-$(CONFIG_SYSTEM_REVOCATION_LIST) += revocation_certificates.o
9 ifneq ($(CONFIG_SYSTEM_BLACKLIST_HASH_LIST),"")
10 obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_hashes.o
12 obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_nohashes.o
15 ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y)
17 $(eval $(call config_filename,SYSTEM_TRUSTED_KEYS))
19 # GCC doesn't include .incbin files in -MD generated dependencies (PR#66871)
20 $(obj)/system_certificates.o: $(obj)/x509_certificate_list
22 # Cope with signing_key.x509 existing in $(srctree) not $(objtree)
23 AFLAGS_system_certificates.o := -I$(srctree)
25 quiet_cmd_extract_certs = EXTRACT_CERTS $(patsubst "%",%,$(2))
26 cmd_extract_certs = scripts/extract-cert $(2) $@
28 targets += 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)$(CONFIG_SYSTEM_TRUSTED_KEYS))
31 endif # CONFIG_SYSTEM_TRUSTED_KEYRING
33 clean-files := x509_certificate_list .x509.list x509_revocation_list
35 ifeq ($(CONFIG_MODULE_SIG),y)
39 ifeq ($(CONFIG_IMA_APPRAISE_MODSIG),y)
40 ifeq ($(CONFIG_MODULES),y)
46 ###############################################################################
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.
52 ###############################################################################
54 # We do it this way rather than having a boolean option for enabling an
55 # external private key, because 'make randconfig' might enable such a
56 # boolean option and we unfortunately can't make it depend on !RANDCONFIG.
57 ifeq ($(CONFIG_MODULE_SIG_KEY),"certs/signing_key.pem")
59 keytype-$(CONFIG_MODULE_SIG_KEY_TYPE_ECDSA) := -newkey ec -pkeyopt ec_paramgen_curve:secp384r1
61 quiet_cmd_gen_key = GENKEY $@
62 cmd_gen_key = openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
63 -batch -x509 -config $(obj)/x509.genkey \
64 -outform PEM -out $(obj)/signing_key.pem \
65 -keyout $(obj)/signing_key.pem $(keytype-y) 2>&1
67 $(obj)/signing_key.pem: $(obj)/x509.genkey FORCE
68 $(call if_changed,gen_key)
70 targets += signing_key.pem
72 quiet_cmd_copy_x509_config = COPY $@
73 cmd_copy_x509_config = cat $(srctree)/$(src)/default_x509.genkey > $@
75 # You can provide your own config file. If not present, copy the default one.
77 $(call cmd,copy_x509_config)
79 endif # CONFIG_MODULE_SIG_KEY
81 $(eval $(call config_filename,MODULE_SIG_KEY))
83 # If CONFIG_MODULE_SIG_KEY isn't a PKCS#11 URI, depend on it
84 ifeq ($(patsubst pkcs11:%,%,$(firstword $(MODULE_SIG_KEY_FILENAME))),$(firstword $(MODULE_SIG_KEY_FILENAME)))
85 X509_DEP := $(MODULE_SIG_KEY_SRCPREFIX)$(MODULE_SIG_KEY_FILENAME)
89 $(obj)/system_certificates.o: $(obj)/signing_key.x509
91 targets += signing_key.x509
92 $(obj)/signing_key.x509: scripts/extract-cert $(X509_DEP) FORCE
93 $(call if_changed,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY))
94 endif # CONFIG_MODULE_SIG
96 ifeq ($(CONFIG_SYSTEM_REVOCATION_LIST),y)
98 $(eval $(call config_filename,SYSTEM_REVOCATION_KEYS))
100 $(obj)/revocation_certificates.o: $(obj)/x509_revocation_list
102 quiet_cmd_extract_certs = EXTRACT_CERTS $(patsubst "%",%,$(2))
103 cmd_extract_certs = scripts/extract-cert $(2) $@
105 targets += x509_revocation_list
106 $(obj)/x509_revocation_list: scripts/extract-cert $(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(SYSTEM_REVOCATION_KEYS_FILENAME) FORCE
107 $(call if_changed,extract_certs,$(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_REVOCATION_KEYS))