| 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 $(srctree)/$(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 | |
| 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 $(srctree)/$(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 | |
| 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) |