certs/Makefile

   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)