1 # SPDX-License-Identifier: GPL-2.0
2 #
3 # Makefile for the linux kernel signature checking certificates.
4 #
5
6 obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o
7 obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o blacklist_hashes.o
8 obj-$(CONFIG_SYSTEM_REVOCATION_LIST) += revocation_certificates.o
9
10 $(obj)/blacklist_hashes.o: $(obj)/blacklist_hash_list
11 CFLAGS_blacklist_hashes.o := -I $(obj)
12
13 quiet_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
23 targets += blacklist_hash_list
24
25 quiet_cmd_extract_certs = CERT $@
26 cmd_extract_certs = $(obj)/extract-cert "$(extract-cert-in)" $@
27 extract-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 $(call if_changed,extract_certs)
33
34 targets += x509_certificate_list
35
36 # If module signing is requested, say by allyesconfig, but a key has not been
37 # supplied, then one will need to be generated to make sure the build does not
38 # fail and that the kernel may be used afterwards.
39 #
40 # We do it this way rather than having a boolean option for enabling an
41 # external private key, because 'make randconfig' might enable such a
42 # boolean option and we unfortunately can't make it depend on !RANDCONFIG.
43 ifeq ($(CONFIG_MODULE_SIG_KEY),certs/signing_key.pem)
44
45 keytype-$(CONFIG_MODULE_SIG_KEY_TYPE_ECDSA) := -newkey ec -pkeyopt ec_paramgen_curve:secp384r1
46
47 quiet_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
55 targets += signing_key.pem
56
57 quiet_cmd_copy_x509_config = COPY $@
58 cmd_copy_x509_config = cat $(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
64 endif # CONFIG_MODULE_SIG_KEY
65
66 $(obj)/system_certificates.o: $(obj)/signing_key.x509
67
68 PKCS11_URI := $(filter pkcs11:%, $(CONFIG_MODULE_SIG_KEY))
69 ifdef PKCS11_URI
70 $(obj)/signing_key.x509: extract-cert-in := $(PKCS11_URI)
71 endif
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
76 targets += 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
83 targets += x509_revocation_list
84
85 hostprogs := extract-cert
86
87 HOSTCFLAGS_extract-cert.o = $(shell $(HOSTPKG_CONFIG) --cflags libcrypto 2> /dev/null)
88 HOSTLDLIBS_extract-cert = $(shell $(HOSTPKG_CONFIG) --libs libcrypto 2> /dev/null || echo -lcrypto)
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