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 redirect_openssl = 2>&1
55 quiet_redirect_openssl = 2>&1
56 silent_redirect_openssl = 2>/dev/null
57 openssl_available = $(shell openssl help 2>/dev/null && echo yes)
59 # We do it this way rather than having a boolean option for enabling an
60 # external private key, because 'make randconfig' might enable such a
61 # boolean option and we unfortunately can't make it depend on !RANDCONFIG.
62 ifeq ($(CONFIG_MODULE_SIG_KEY),"certs/signing_key.pem")
64 ifeq ($(openssl_available),yes)
65 X509TEXT=$(shell openssl x509 -in "certs/signing_key.pem" -text 2>/dev/null)
68 # Support user changing key type
69 ifdef CONFIG_MODULE_SIG_KEY_TYPE_ECDSA
70 keytype_openssl = -newkey ec -pkeyopt ec_paramgen_curve:secp384r1
71 ifeq ($(openssl_available),yes)
72 $(if $(findstring id-ecPublicKey,$(X509TEXT)),,$(shell rm -f "certs/signing_key.pem"))
74 endif # CONFIG_MODULE_SIG_KEY_TYPE_ECDSA
76 ifdef CONFIG_MODULE_SIG_KEY_TYPE_RSA
77 ifeq ($(openssl_available),yes)
78 $(if $(findstring rsaEncryption,$(X509TEXT)),,$(shell rm -f "certs/signing_key.pem"))
80 endif # CONFIG_MODULE_SIG_KEY_TYPE_RSA
82 $(obj)/signing_key.pem: $(obj)/x509.genkey
84 @$(kecho) "### Now generating an X.509 key pair to be used for signing modules."
86 @$(kecho) "### If this takes a long time, you might wish to run rngd in the"
87 @$(kecho) "### background to keep the supply of entropy topped up. It"
88 @$(kecho) "### needs to be run as root, and uses a hardware random"
89 @$(kecho) "### number generator if one is available."
91 $(Q)openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
92 -batch -x509 -config $(obj)/x509.genkey \
93 -outform PEM -out $(obj)/signing_key.pem \
94 -keyout $(obj)/signing_key.pem \
96 $($(quiet)redirect_openssl)
98 @$(kecho) "### Key pair generated."
101 quiet_cmd_copy_x509_config = COPY $@
102 cmd_copy_x509_config = cat $(srctree)/$(src)/default_x509.genkey > $@
104 # You can provide your own config file. If not present, copy the default one.
106 $(call cmd,copy_x509_config)
108 endif # CONFIG_MODULE_SIG_KEY
110 $(eval $(call config_filename,MODULE_SIG_KEY))
112 # If CONFIG_MODULE_SIG_KEY isn't a PKCS#11 URI, depend on it
113 ifeq ($(patsubst pkcs11:%,%,$(firstword $(MODULE_SIG_KEY_FILENAME))),$(firstword $(MODULE_SIG_KEY_FILENAME)))
114 X509_DEP := $(MODULE_SIG_KEY_SRCPREFIX)$(MODULE_SIG_KEY_FILENAME)
117 # GCC PR#66871 again.
118 $(obj)/system_certificates.o: $(obj)/signing_key.x509
120 targets += signing_key.x509
121 $(obj)/signing_key.x509: scripts/extract-cert $(X509_DEP) FORCE
122 $(call if_changed,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY))
123 endif # CONFIG_MODULE_SIG
125 ifeq ($(CONFIG_SYSTEM_REVOCATION_LIST),y)
127 $(eval $(call config_filename,SYSTEM_REVOCATION_KEYS))
129 $(obj)/revocation_certificates.o: $(obj)/x509_revocation_list
131 quiet_cmd_extract_certs = EXTRACT_CERTS $(patsubst "%",%,$(2))
132 cmd_extract_certs = scripts/extract-cert $(2) $@
134 targets += x509_revocation_list
135 $(obj)/x509_revocation_list: scripts/extract-cert $(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(SYSTEM_REVOCATION_KEYS_FILENAME) FORCE
136 $(call if_changed,extract_certs,$(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_REVOCATION_KEYS))