1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 # 2 #
3 # Makefile for the linux kernel signature chec 3 # Makefile for the linux kernel signature checking certificates.
4 # 4 #
5 5
6 obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system !! 6 obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o common.o
7 obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blac !! 7 obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o common.o
8 obj-$(CONFIG_SYSTEM_REVOCATION_LIST) += revoca 8 obj-$(CONFIG_SYSTEM_REVOCATION_LIST) += revocation_certificates.o
>> 9 ifneq ($(CONFIG_SYSTEM_BLACKLIST_HASH_LIST),"")
>> 10 obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_hashes.o
>> 11 else
>> 12 obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_nohashes.o
>> 13 endif
9 14
10 $(obj)/blacklist_hashes.o: $(obj)/blacklist_ha !! 15 ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y)
11 CFLAGS_blacklist_hashes.o := -I $(obj) <<
12 16
13 quiet_cmd_check_and_copy_blacklist_hash_list = !! 17 $(eval $(call config_filename,SYSTEM_TRUSTED_KEYS))
14 cmd_check_and_copy_blacklist_hash_list = <<
15 $(if $(CONFIG_SYSTEM_BLACKLIST_HASH_LI <<
16 $(AWK) -f $(src)/check-blacklist-hashe <<
17 { cat $(CONFIG_SYSTEM_BLACKLIST_HASH_L <<
18 echo NULL > $@) <<
19 <<
20 $(obj)/blacklist_hash_list: $(CONFIG_SYSTEM_BL <<
21 $(call if_changed,check_and_copy_black <<
22 <<
23 targets += blacklist_hash_list <<
24 <<
25 quiet_cmd_extract_certs = CERT $@ <<
26 cmd_extract_certs = $(obj)/extract-cert <<
27 extract-cert-in = $(filter-out $(obj)/extract- <<
28 18
>> 19 # GCC doesn't include .incbin files in -MD generated dependencies (PR#66871)
29 $(obj)/system_certificates.o: $(obj)/x509_cert 20 $(obj)/system_certificates.o: $(obj)/x509_certificate_list
30 21
31 $(obj)/x509_certificate_list: $(CONFIG_SYSTEM_ !! 22 # Cope with signing_key.x509 existing in $(srctree) not $(objtree)
32 $(call if_changed,extract_certs) !! 23 AFLAGS_system_certificates.o := -I$(srctree)
>> 24
>> 25 quiet_cmd_extract_certs = EXTRACT_CERTS $(patsubst "%",%,$(2))
>> 26 cmd_extract_certs = scripts/extract-cert $(2) $@
33 27
34 targets += x509_certificate_list 28 targets += x509_certificate_list
>> 29 $(obj)/x509_certificate_list: scripts/extract-cert $(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(SYSTEM_TRUSTED_KEYS_FILENAME) FORCE
>> 30 $(call if_changed,extract_certs,$(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_TRUSTED_KEYS))
>> 31 endif # CONFIG_SYSTEM_TRUSTED_KEYRING
>> 32
>> 33 clean-files := x509_certificate_list .x509.list x509_revocation_list
>> 34
>> 35 ifeq ($(CONFIG_MODULE_SIG),y)
>> 36 SIGN_KEY = y
>> 37 endif
>> 38
>> 39 ifeq ($(CONFIG_IMA_APPRAISE_MODSIG),y)
>> 40 ifeq ($(CONFIG_MODULES),y)
>> 41 SIGN_KEY = y
>> 42 endif
>> 43 endif
35 44
>> 45 ifdef SIGN_KEY
>> 46 ###############################################################################
>> 47 #
36 # If module signing is requested, say by allye 48 # If module signing is requested, say by allyesconfig, but a key has not been
37 # supplied, then one will need to be generated 49 # supplied, then one will need to be generated to make sure the build does not
38 # fail and that the kernel may be used afterwa 50 # fail and that the kernel may be used afterwards.
39 # 51 #
>> 52 ###############################################################################
>> 53 ifndef CONFIG_MODULE_SIG_HASH
>> 54 $(error Could not determine digest type to use from kernel config)
>> 55 endif
>> 56
>> 57 redirect_openssl = 2>&1
>> 58 quiet_redirect_openssl = 2>&1
>> 59 silent_redirect_openssl = 2>/dev/null
>> 60 openssl_available = $(shell openssl help 2>/dev/null && echo yes)
>> 61
40 # We do it this way rather than having a boole 62 # We do it this way rather than having a boolean option for enabling an
41 # external private key, because 'make randconf 63 # external private key, because 'make randconfig' might enable such a
42 # boolean option and we unfortunately can't ma 64 # boolean option and we unfortunately can't make it depend on !RANDCONFIG.
43 ifeq ($(CONFIG_MODULE_SIG_KEY),certs/signing_k !! 65 ifeq ($(CONFIG_MODULE_SIG_KEY),"certs/signing_key.pem")
44 66
45 keytype-$(CONFIG_MODULE_SIG_KEY_TYPE_ECDSA) := !! 67 ifeq ($(openssl_available),yes)
46 !! 68 X509TEXT=$(shell openssl x509 -in "certs/signing_key.pem" -text 2>/dev/null)
47 quiet_cmd_gen_key = GENKEY $@ !! 69 endif
48 cmd_gen_key = openssl req -new -nodes -u <<
49 -batch -x509 -config $< \ <<
50 -outform PEM -out $@ -keyout $ <<
51 70
52 $(obj)/signing_key.pem: $(obj)/x509.genkey FOR !! 71 # Support user changing key type
53 $(call if_changed,gen_key) !! 72 ifdef CONFIG_MODULE_SIG_KEY_TYPE_ECDSA
>> 73 keytype_openssl = -newkey ec -pkeyopt ec_paramgen_curve:secp384r1
>> 74 ifeq ($(openssl_available),yes)
>> 75 $(if $(findstring id-ecPublicKey,$(X509TEXT)),,$(shell rm -f "certs/signing_key.pem"))
>> 76 endif
>> 77 endif # CONFIG_MODULE_SIG_KEY_TYPE_ECDSA
54 78
55 targets += signing_key.pem !! 79 ifdef CONFIG_MODULE_SIG_KEY_TYPE_RSA
>> 80 ifeq ($(openssl_available),yes)
>> 81 $(if $(findstring rsaEncryption,$(X509TEXT)),,$(shell rm -f "certs/signing_key.pem"))
>> 82 endif
>> 83 endif # CONFIG_MODULE_SIG_KEY_TYPE_RSA
56 84
57 quiet_cmd_copy_x509_config = COPY $@ !! 85 $(obj)/signing_key.pem: $(obj)/x509.genkey
58 cmd_copy_x509_config = cat $(src)/defaul !! 86 @$(kecho) "###"
>> 87 @$(kecho) "### Now generating an X.509 key pair to be used for signing modules."
>> 88 @$(kecho) "###"
>> 89 @$(kecho) "### If this takes a long time, you might wish to run rngd in the"
>> 90 @$(kecho) "### background to keep the supply of entropy topped up. It"
>> 91 @$(kecho) "### needs to be run as root, and uses a hardware random"
>> 92 @$(kecho) "### number generator if one is available."
>> 93 @$(kecho) "###"
>> 94 $(Q)openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
>> 95 -batch -x509 -config $(obj)/x509.genkey \
>> 96 -outform PEM -out $(obj)/signing_key.pem \
>> 97 -keyout $(obj)/signing_key.pem \
>> 98 $(keytype_openssl) \
>> 99 $($(quiet)redirect_openssl)
>> 100 @$(kecho) "###"
>> 101 @$(kecho) "### Key pair generated."
>> 102 @$(kecho) "###"
59 103
60 # You can provide your own config file. If not <<
61 $(obj)/x509.genkey: 104 $(obj)/x509.genkey:
62 $(call cmd,copy_x509_config) !! 105 @$(kecho) Generating X.509 key generation config
63 !! 106 @echo >$@ "[ req ]"
>> 107 @echo >>$@ "default_bits = 4096"
>> 108 @echo >>$@ "distinguished_name = req_distinguished_name"
>> 109 @echo >>$@ "prompt = no"
>> 110 @echo >>$@ "string_mask = utf8only"
>> 111 @echo >>$@ "x509_extensions = myexts"
>> 112 @echo >>$@
>> 113 @echo >>$@ "[ req_distinguished_name ]"
>> 114 @echo >>$@ "#O = Unspecified company"
>> 115 @echo >>$@ "CN = Build time autogenerated kernel key"
>> 116 @echo >>$@ "#emailAddress = unspecified.user@unspecified.company"
>> 117 @echo >>$@
>> 118 @echo >>$@ "[ myexts ]"
>> 119 @echo >>$@ "basicConstraints=critical,CA:FALSE"
>> 120 @echo >>$@ "keyUsage=digitalSignature"
>> 121 @echo >>$@ "subjectKeyIdentifier=hash"
>> 122 @echo >>$@ "authorityKeyIdentifier=keyid"
64 endif # CONFIG_MODULE_SIG_KEY 123 endif # CONFIG_MODULE_SIG_KEY
65 124
66 $(obj)/system_certificates.o: $(obj)/signing_k !! 125 $(eval $(call config_filename,MODULE_SIG_KEY))
67 126
68 PKCS11_URI := $(filter pkcs11:%, $(CONFIG_MODU !! 127 # If CONFIG_MODULE_SIG_KEY isn't a PKCS#11 URI, depend on it
69 ifdef PKCS11_URI !! 128 ifeq ($(patsubst pkcs11:%,%,$(firstword $(MODULE_SIG_KEY_FILENAME))),$(firstword $(MODULE_SIG_KEY_FILENAME)))
70 $(obj)/signing_key.x509: extract-cert-in := $( !! 129 X509_DEP := $(MODULE_SIG_KEY_SRCPREFIX)$(MODULE_SIG_KEY_FILENAME)
71 endif 130 endif
72 131
73 $(obj)/signing_key.x509: $(filter-out $(PKCS11 !! 132 # GCC PR#66871 again.
74 $(call if_changed,extract_certs) !! 133 $(obj)/system_certificates.o: $(obj)/signing_key.x509
75 134
76 targets += signing_key.x509 135 targets += signing_key.x509
>> 136 $(obj)/signing_key.x509: scripts/extract-cert $(X509_DEP) FORCE
>> 137 $(call if_changed,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY))
>> 138 endif # CONFIG_MODULE_SIG
77 139
78 $(obj)/revocation_certificates.o: $(obj)/x509_ !! 140 ifeq ($(CONFIG_SYSTEM_REVOCATION_LIST),y)
79 141
80 $(obj)/x509_revocation_list: $(CONFIG_SYSTEM_R !! 142 $(eval $(call config_filename,SYSTEM_REVOCATION_KEYS))
81 $(call if_changed,extract_certs) <<
82 143
83 targets += x509_revocation_list !! 144 $(obj)/revocation_certificates.o: $(obj)/x509_revocation_list
84 145
85 hostprogs := extract-cert !! 146 quiet_cmd_extract_certs = EXTRACT_CERTS $(patsubst "%",%,$(2))
>> 147 cmd_extract_certs = scripts/extract-cert $(2) $@
86 148
87 HOSTCFLAGS_extract-cert.o = $(shell $(HOSTPKG_ !! 149 targets += x509_revocation_list
88 HOSTLDLIBS_extract-cert = $(shell $(HOSTPKG_CO !! 150 $(obj)/x509_revocation_list: scripts/extract-cert $(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(SYSTEM_REVOCATION_KEYS_FILENAME) FORCE
>> 151 $(call if_changed,extract_certs,$(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_REVOCATION_KEYS))
>> 152 endif
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