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 quiet_cmd_extract_certs = CERT $@
16 cmd_extract_certs = $(obj)/extract-cert $(extract-cert-in) $@
17 extract-cert-in = $(or $(filter-out $(obj)/extract-cert, $(real-prereqs)),"")
19 $(obj)/system_certificates.o: $(obj)/x509_certificate_list
21 $(obj)/x509_certificate_list: $(CONFIG_SYSTEM_TRUSTED_KEYS) $(obj)/extract-cert FORCE
22 $(call if_changed,extract_certs)
24 targets += x509_certificate_list
26 # If module signing is requested, say by allyesconfig, but a key has not been
27 # supplied, then one will need to be generated to make sure the build does not
28 # fail and that the kernel may be used afterwards.
30 # We do it this way rather than having a boolean option for enabling an
31 # external private key, because 'make randconfig' might enable such a
32 # boolean option and we unfortunately can't make it depend on !RANDCONFIG.
33 ifeq ($(CONFIG_MODULE_SIG_KEY),certs/signing_key.pem)
35 keytype-$(CONFIG_MODULE_SIG_KEY_TYPE_ECDSA) := -newkey ec -pkeyopt ec_paramgen_curve:secp384r1
37 quiet_cmd_gen_key = GENKEY $@
38 cmd_gen_key = openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
39 -batch -x509 -config $< \
40 -outform PEM -out $@ -keyout $@ $(keytype-y) 2>&1
42 $(obj)/signing_key.pem: $(obj)/x509.genkey FORCE
43 $(call if_changed,gen_key)
45 targets += signing_key.pem
47 quiet_cmd_copy_x509_config = COPY $@
48 cmd_copy_x509_config = cat $(srctree)/$(src)/default_x509.genkey > $@
50 # You can provide your own config file. If not present, copy the default one.
52 $(call cmd,copy_x509_config)
54 endif # CONFIG_MODULE_SIG_KEY
56 $(obj)/system_certificates.o: $(obj)/signing_key.x509
58 PKCS11_URI := $(filter pkcs11:%, $(CONFIG_MODULE_SIG_KEY))
60 $(obj)/signing_key.x509: extract-cert-in := $(PKCS11_URI)
63 $(obj)/signing_key.x509: $(filter-out $(PKCS11_URI),$(CONFIG_MODULE_SIG_KEY)) $(obj)/extract-cert FORCE
64 $(call if_changed,extract_certs)
66 targets += signing_key.x509
68 $(obj)/revocation_certificates.o: $(obj)/x509_revocation_list
70 $(obj)/x509_revocation_list: $(CONFIG_SYSTEM_REVOCATION_KEYS) $(obj)/extract-cert FORCE
71 $(call if_changed,extract_certs)
73 targets += x509_revocation_list
75 hostprogs := extract-cert
77 HOSTCFLAGS_extract-cert.o = $(shell pkg-config --cflags libcrypto 2> /dev/null)
78 HOSTLDLIBS_extract-cert = $(shell pkg-config --libs libcrypto 2> /dev/null || echo -lcrypto)