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