projects/linux·blob master · refs

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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 $(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 = $(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-$(CONFIG_MODULE_SIG_KEY_TYPE_ECDSA) := -newkey ec -pkeyopt ec_paramgen_curve:secp384r1
46keytype-$(CONFIG_MODULE_SIG_KEY_TYPE_MLDSA_44) := -newkey ml-dsa-44
47keytype-$(CONFIG_MODULE_SIG_KEY_TYPE_MLDSA_65) := -newkey ml-dsa-65
48keytype-$(CONFIG_MODULE_SIG_KEY_TYPE_MLDSA_87) := -newkey ml-dsa-87
49
50quiet_cmd_gen_key = GENKEY $@
51 cmd_gen_key = openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
52 -batch -x509 -config $< \
53 -outform PEM -out $@ -keyout $@ $(keytype-y) 2>&1
54
55$(obj)/signing_key.pem: $(obj)/x509.genkey FORCE
56 $(call if_changed,gen_key)
57
58targets += signing_key.pem
59
60quiet_cmd_copy_x509_config = COPY $@
61 cmd_copy_x509_config = cat $(src)/default_x509.genkey > $@
62
63# You can provide your own config file. If not present, copy the default one.
64$(obj)/x509.genkey:
65 $(call cmd,copy_x509_config)
66
67endif # CONFIG_MODULE_SIG_KEY
68
69$(obj)/system_certificates.o: $(obj)/signing_key.x509
70
71PKCS11_URI := $(filter pkcs11:%, $(CONFIG_MODULE_SIG_KEY))
72ifdef PKCS11_URI
73$(obj)/signing_key.x509: extract-cert-in := $(PKCS11_URI)
74endif
75
76$(obj)/signing_key.x509: $(filter-out $(PKCS11_URI),$(CONFIG_MODULE_SIG_KEY)) $(obj)/extract-cert FORCE
77 $(call if_changed,extract_certs)
78
79targets += signing_key.x509
80
81$(obj)/revocation_certificates.o: $(obj)/x509_revocation_list
82
83$(obj)/x509_revocation_list: $(CONFIG_SYSTEM_REVOCATION_KEYS) $(obj)/extract-cert FORCE
84 $(call if_changed,extract_certs)
85
86targets += x509_revocation_list
87
88hostprogs := extract-cert
89
90HOSTCFLAGS_extract-cert.o = $(shell $(HOSTPKG_CONFIG) --cflags libcrypto 2> /dev/null) -I$(srctree)/scripts
91HOSTLDLIBS_extract-cert = $(shell $(HOSTPKG_CONFIG) --libs libcrypto 2> /dev/null || echo -lcrypto)