1# SPDX-License-Identifier: GPL-2.0
2#
3# Makefile for the linux kernel signature checking certificates.
4#
5
6obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o
7obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o blacklist_hashes.o
8obj-$(CONFIG_SYSTEM_REVOCATION_LIST) += revocation_certificates.o
9
10$(obj)/blacklist_hashes.o: $(obj)/blacklist_hash_list
11CFLAGS_blacklist_hashes.o := -I $(obj)
12
13quiet_cmd_check_and_copy_blacklist_hash_list = GEN     $@
14      cmd_check_and_copy_blacklist_hash_list = \
15	$(if $(CONFIG_SYSTEM_BLACKLIST_HASH_LIST), \
16	$(AWK) -f $(srctree)/$(src)/check-blacklist-hashes.awk $(CONFIG_SYSTEM_BLACKLIST_HASH_LIST) >&2; \
17	{ cat $(CONFIG_SYSTEM_BLACKLIST_HASH_LIST); echo $(comma) NULL; } > $@, \
18	echo NULL > $@)
19
20$(obj)/blacklist_hash_list: $(CONFIG_SYSTEM_BLACKLIST_HASH_LIST) FORCE
21	$(call if_changed,check_and_copy_blacklist_hash_list)
22
23targets += blacklist_hash_list
24
25quiet_cmd_extract_certs  = CERT    $@
26      cmd_extract_certs  = $(obj)/extract-cert $(extract-cert-in) $@
27extract-cert-in = $(or $(filter-out $(obj)/extract-cert, $(real-prereqs)),"")
28
29$(obj)/system_certificates.o: $(obj)/x509_certificate_list
30
31$(obj)/x509_certificate_list: $(CONFIG_SYSTEM_TRUSTED_KEYS) $(obj)/extract-cert FORCE
32	$(call if_changed,extract_certs)
33
34targets += x509_certificate_list
35
36# If module signing is requested, say by allyesconfig, but a key has not been
37# supplied, then one will need to be generated to make sure the build does not
38# fail and that the kernel may be used afterwards.
39#
40# We do it this way rather than having a boolean option for enabling an
41# external private key, because 'make randconfig' might enable such a
42# boolean option and we unfortunately can't make it depend on !RANDCONFIG.
43ifeq ($(CONFIG_MODULE_SIG_KEY),certs/signing_key.pem)
44
45keytype-$(CONFIG_MODULE_SIG_KEY_TYPE_ECDSA) := -newkey ec -pkeyopt ec_paramgen_curve:secp384r1
46
47quiet_cmd_gen_key = GENKEY  $@
48      cmd_gen_key = openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
49		-batch -x509 -config $< \
50		-outform PEM -out $@ -keyout $@ $(keytype-y) 2>&1
51
52$(obj)/signing_key.pem: $(obj)/x509.genkey FORCE
53	$(call if_changed,gen_key)
54
55targets += signing_key.pem
56
57quiet_cmd_copy_x509_config = COPY    $@
58      cmd_copy_x509_config = cat $(srctree)/$(src)/default_x509.genkey > $@
59
60# You can provide your own config file. If not present, copy the default one.
61$(obj)/x509.genkey:
62	$(call cmd,copy_x509_config)
63
64endif # CONFIG_MODULE_SIG_KEY
65
66$(obj)/system_certificates.o: $(obj)/signing_key.x509
67
68PKCS11_URI := $(filter pkcs11:%, $(CONFIG_MODULE_SIG_KEY))
69ifdef PKCS11_URI
70$(obj)/signing_key.x509: extract-cert-in := $(PKCS11_URI)
71endif
72
73$(obj)/signing_key.x509: $(filter-out $(PKCS11_URI),$(CONFIG_MODULE_SIG_KEY)) $(obj)/extract-cert FORCE
74	$(call if_changed,extract_certs)
75
76targets += signing_key.x509
77
78$(obj)/revocation_certificates.o: $(obj)/x509_revocation_list
79
80$(obj)/x509_revocation_list: $(CONFIG_SYSTEM_REVOCATION_KEYS) $(obj)/extract-cert FORCE
81	$(call if_changed,extract_certs)
82
83targets += x509_revocation_list
84
85hostprogs := extract-cert
86
87HOSTCFLAGS_extract-cert.o = $(shell $(HOSTPKG_CONFIG) --cflags libcrypto 2> /dev/null)
88HOSTLDLIBS_extract-cert = $(shell $(HOSTPKG_CONFIG) --libs libcrypto 2> /dev/null || echo -lcrypto)
89